1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2017 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "opcode/i386.h"
35 #include "elf/x86-64.h"
42 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
43 #define MINUS_ONE (~ (bfd_vma) 0)
45 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
46 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
47 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
48 since they are the same. */
50 #define ABI_64_P(abfd) \
51 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
53 /* The relocation "howto" table. Order of fields:
54 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
55 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
56 static reloc_howto_type x86_64_elf_howto_table[] =
58 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
59 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
61 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
64 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
65 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
67 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
68 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
70 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
71 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
73 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
76 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
79 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
82 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
85 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
86 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
88 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
89 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
91 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
92 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
94 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
96 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
98 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
100 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
101 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
102 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
105 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
108 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
111 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
114 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
115 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
117 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
118 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
120 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
121 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
123 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
124 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
126 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
129 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
131 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
132 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
133 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
134 FALSE, 0xffffffff, 0xffffffff, TRUE),
135 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
136 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
138 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
139 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
141 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
142 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
143 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
144 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
145 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
147 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
148 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
150 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
151 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
153 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
154 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
156 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
157 complain_overflow_bitfield, bfd_elf_generic_reloc,
158 "R_X86_64_GOTPC32_TLSDESC",
159 FALSE, 0xffffffff, 0xffffffff, TRUE),
160 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
161 complain_overflow_dont, bfd_elf_generic_reloc,
162 "R_X86_64_TLSDESC_CALL",
164 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
165 complain_overflow_bitfield, bfd_elf_generic_reloc,
167 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
168 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
171 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
172 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
174 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
175 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
177 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
178 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
180 HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
181 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
183 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
184 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
187 /* We have a gap in the reloc numbers here.
188 R_X86_64_standard counts the number up to this point, and
189 R_X86_64_vt_offset is the value to subtract from a reloc type of
190 R_X86_64_GNU_VT* to form an index into this table. */
191 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
192 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
194 /* GNU extension to record C++ vtable hierarchy. */
195 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
196 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
198 /* GNU extension to record C++ vtable member usage. */
199 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
200 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
203 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
204 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
205 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
209 #define IS_X86_64_PCREL_TYPE(TYPE) \
210 ( ((TYPE) == R_X86_64_PC8) \
211 || ((TYPE) == R_X86_64_PC16) \
212 || ((TYPE) == R_X86_64_PC32) \
213 || ((TYPE) == R_X86_64_PC32_BND) \
214 || ((TYPE) == R_X86_64_PC64))
216 /* Map BFD relocs to the x86_64 elf relocs. */
219 bfd_reloc_code_real_type bfd_reloc_val;
220 unsigned char elf_reloc_val;
223 static const struct elf_reloc_map x86_64_reloc_map[] =
225 { BFD_RELOC_NONE, R_X86_64_NONE, },
226 { BFD_RELOC_64, R_X86_64_64, },
227 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
228 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
229 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
230 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
231 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
232 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
233 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
234 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
235 { BFD_RELOC_32, R_X86_64_32, },
236 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
237 { BFD_RELOC_16, R_X86_64_16, },
238 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
239 { BFD_RELOC_8, R_X86_64_8, },
240 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
241 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
242 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
243 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
244 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
245 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
246 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
247 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
248 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
249 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
250 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
251 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
252 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
253 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
254 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
255 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
256 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
257 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
258 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
259 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
260 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
261 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
262 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
263 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
264 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
265 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
266 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
267 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
268 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
271 static reloc_howto_type *
272 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
276 if (r_type == (unsigned int) R_X86_64_32)
281 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
283 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
284 || r_type >= (unsigned int) R_X86_64_max)
286 if (r_type >= (unsigned int) R_X86_64_standard)
288 /* xgettext:c-format */
289 _bfd_error_handler (_("%B: invalid relocation type %d"),
291 r_type = R_X86_64_NONE;
296 i = r_type - (unsigned int) R_X86_64_vt_offset;
297 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
298 return &x86_64_elf_howto_table[i];
301 /* Given a BFD reloc type, return a HOWTO structure. */
302 static reloc_howto_type *
303 elf_x86_64_reloc_type_lookup (bfd *abfd,
304 bfd_reloc_code_real_type code)
308 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
311 if (x86_64_reloc_map[i].bfd_reloc_val == code)
312 return elf_x86_64_rtype_to_howto (abfd,
313 x86_64_reloc_map[i].elf_reloc_val);
318 static reloc_howto_type *
319 elf_x86_64_reloc_name_lookup (bfd *abfd,
324 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
326 /* Get x32 R_X86_64_32. */
327 reloc_howto_type *reloc
328 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
329 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
333 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
334 if (x86_64_elf_howto_table[i].name != NULL
335 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
336 return &x86_64_elf_howto_table[i];
341 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
344 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
345 Elf_Internal_Rela *dst)
349 r_type = ELF32_R_TYPE (dst->r_info);
350 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
351 BFD_ASSERT (r_type == cache_ptr->howto->type);
354 /* Support for core dump NOTE sections. */
356 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
361 switch (note->descsz)
366 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
368 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
371 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
379 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
381 elf_tdata (abfd)->core->signal
382 = bfd_get_16 (abfd, note->descdata + 12);
385 elf_tdata (abfd)->core->lwpid
386 = bfd_get_32 (abfd, note->descdata + 32);
395 /* Make a ".reg/999" section. */
396 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
397 size, note->descpos + offset);
401 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
403 switch (note->descsz)
408 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
409 elf_tdata (abfd)->core->pid
410 = bfd_get_32 (abfd, note->descdata + 12);
411 elf_tdata (abfd)->core->program
412 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
413 elf_tdata (abfd)->core->command
414 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
417 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
418 elf_tdata (abfd)->core->pid
419 = bfd_get_32 (abfd, note->descdata + 24);
420 elf_tdata (abfd)->core->program
421 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
422 elf_tdata (abfd)->core->command
423 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
426 /* Note that for some reason, a spurious space is tacked
427 onto the end of the args in some (at least one anyway)
428 implementations, so strip it off if it exists. */
431 char *command = elf_tdata (abfd)->core->command;
432 int n = strlen (command);
434 if (0 < n && command[n - 1] == ' ')
435 command[n - 1] = '\0';
443 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
446 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
448 const char *fname, *psargs;
459 va_start (ap, note_type);
460 fname = va_arg (ap, const char *);
461 psargs = va_arg (ap, const char *);
464 if (bed->s->elfclass == ELFCLASS32)
467 memset (&data, 0, sizeof (data));
468 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
469 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
470 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
471 &data, sizeof (data));
476 memset (&data, 0, sizeof (data));
477 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
478 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
479 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
480 &data, sizeof (data));
485 va_start (ap, note_type);
486 pid = va_arg (ap, long);
487 cursig = va_arg (ap, int);
488 gregs = va_arg (ap, const void *);
491 if (bed->s->elfclass == ELFCLASS32)
493 if (bed->elf_machine_code == EM_X86_64)
495 prstatusx32_t prstat;
496 memset (&prstat, 0, sizeof (prstat));
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
506 memset (&prstat, 0, sizeof (prstat));
508 prstat.pr_cursig = cursig;
509 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
510 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
511 &prstat, sizeof (prstat));
517 memset (&prstat, 0, sizeof (prstat));
519 prstat.pr_cursig = cursig;
520 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
521 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
522 &prstat, sizeof (prstat));
529 /* Functions for the x86-64 ELF linker. */
531 /* The name of the dynamic interpreter. This is put in the .interp
534 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
535 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
541 #define ELIMINATE_COPY_RELOCS 1
543 /* The size in bytes of an entry in the global offset table. */
545 #define GOT_ENTRY_SIZE 8
547 /* The size in bytes of an entry in the lazy procedure linkage table. */
549 #define LAZY_PLT_ENTRY_SIZE 16
551 /* The size in bytes of an entry in the non-lazy procedure linkage
554 #define NON_LAZY_PLT_ENTRY_SIZE 8
556 /* The first entry in a lazy procedure linkage table looks like this.
557 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this
560 static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
562 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
563 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
564 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
567 /* Subsequent entries in a lazy procedure linkage table look like this. */
569 static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
571 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
572 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
573 0x68, /* pushq immediate */
574 0, 0, 0, 0, /* replaced with index into relocation table. */
575 0xe9, /* jmp relative */
576 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
579 /* The first entry in a lazy procedure linkage table with BND prefix
582 static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
584 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
585 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
586 0x0f, 0x1f, 0 /* nopl (%rax) */
589 /* Subsequent entries for branches with BND prefx in a lazy procedure
590 linkage table look like this. */
592 static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] =
594 0x68, 0, 0, 0, 0, /* pushq immediate */
595 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
596 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
599 /* The first entry in the IBT-enabled lazy procedure linkage table is the
600 the same as the lazy PLT with BND prefix so that bound registers are
601 preserved when control is passed to dynamic linker. Subsequent
602 entries for a IBT-enabled lazy procedure linkage table look like
605 static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
607 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
608 0x68, 0, 0, 0, 0, /* pushq immediate */
609 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
613 /* The first entry in the x32 IBT-enabled lazy procedure linkage table
614 is the same as the normal lazy PLT. Subsequent entries for an
615 x32 IBT-enabled lazy procedure linkage table look like this. */
617 static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
619 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
620 0x68, 0, 0, 0, 0, /* pushq immediate */
621 0xe9, 0, 0, 0, 0, /* jmpq relative */
622 0x66, 0x90 /* xchg %ax,%ax */
625 /* Entries in the non-lazey procedure linkage table look like this. */
627 static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
629 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
630 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
631 0x66, 0x90 /* xchg %ax,%ax */
634 /* Entries for branches with BND prefix in the non-lazey procedure
635 linkage table look like this. */
637 static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
639 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
640 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
644 /* Entries for branches with IBT-enabled in the non-lazey procedure
645 linkage table look like this. They have the same size as the lazy
648 static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
650 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
651 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
652 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
653 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */
656 /* Entries for branches with IBT-enabled in the x32 non-lazey procedure
657 linkage table look like this. They have the same size as the lazy
660 static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
662 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
663 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
664 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
665 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
668 /* .eh_frame covering the lazy .plt section. */
670 static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] =
672 #define PLT_CIE_LENGTH 20
673 #define PLT_FDE_LENGTH 36
674 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
675 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
676 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
677 0, 0, 0, 0, /* CIE ID */
679 'z', 'R', 0, /* Augmentation string */
680 1, /* Code alignment factor */
681 0x78, /* Data alignment factor */
682 16, /* Return address column */
683 1, /* Augmentation size */
684 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
685 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
686 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
687 DW_CFA_nop, DW_CFA_nop,
689 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
690 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
691 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
692 0, 0, 0, 0, /* .plt size goes here */
693 0, /* Augmentation size */
694 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
695 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
696 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
697 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
698 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
699 11, /* Block length */
700 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
701 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
702 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
703 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
704 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
707 /* .eh_frame covering the lazy BND .plt section. */
709 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] =
711 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
712 0, 0, 0, 0, /* CIE ID */
714 'z', 'R', 0, /* Augmentation string */
715 1, /* Code alignment factor */
716 0x78, /* Data alignment factor */
717 16, /* Return address column */
718 1, /* Augmentation size */
719 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
720 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
721 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
722 DW_CFA_nop, DW_CFA_nop,
724 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
725 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
726 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
727 0, 0, 0, 0, /* .plt size goes here */
728 0, /* Augmentation size */
729 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
730 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
731 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
732 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
733 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
734 11, /* Block length */
735 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
736 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
737 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge,
738 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
739 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
742 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
744 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] =
746 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
747 0, 0, 0, 0, /* CIE ID */
749 'z', 'R', 0, /* Augmentation string */
750 1, /* Code alignment factor */
751 0x78, /* Data alignment factor */
752 16, /* Return address column */
753 1, /* Augmentation size */
754 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
755 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
756 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
757 DW_CFA_nop, DW_CFA_nop,
759 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
760 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
761 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
762 0, 0, 0, 0, /* .plt size goes here */
763 0, /* Augmentation size */
764 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
765 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
766 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
767 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
768 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
769 11, /* Block length */
770 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
771 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
772 DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge,
773 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
774 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
777 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */
779 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] =
781 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
782 0, 0, 0, 0, /* CIE ID */
784 'z', 'R', 0, /* Augmentation string */
785 1, /* Code alignment factor */
786 0x78, /* Data alignment factor */
787 16, /* Return address column */
788 1, /* Augmentation size */
789 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
790 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
791 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
792 DW_CFA_nop, DW_CFA_nop,
794 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
795 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
796 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
797 0, 0, 0, 0, /* .plt size goes here */
798 0, /* Augmentation size */
799 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
800 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
801 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
802 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
803 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
804 11, /* Block length */
805 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
806 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
807 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
808 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
809 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
812 /* .eh_frame covering the non-lazy .plt section. */
814 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] =
816 #define PLT_GOT_FDE_LENGTH 20
817 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
818 0, 0, 0, 0, /* CIE ID */
820 'z', 'R', 0, /* Augmentation string */
821 1, /* Code alignment factor */
822 0x78, /* Data alignment factor */
823 16, /* Return address column */
824 1, /* Augmentation size */
825 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
826 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
827 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
828 DW_CFA_nop, DW_CFA_nop,
830 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
831 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
832 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
833 0, 0, 0, 0, /* non-lazy .plt size goes here */
834 0, /* Augmentation size */
835 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,
836 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
839 struct elf_x86_64_lazy_plt_layout
841 /* Templates for the initial PLT entry and for subsequent entries. */
842 const bfd_byte *plt0_entry;
843 const bfd_byte *plt_entry;
844 unsigned int plt_entry_size; /* Size of each PLT entry. */
846 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
847 unsigned int plt0_got1_offset;
848 unsigned int plt0_got2_offset;
850 /* Offset of the end of the PC-relative instruction containing
852 unsigned int plt0_got2_insn_end;
854 /* Offsets into plt_entry that are to be replaced with... */
855 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
856 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
857 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
859 /* Length of the PC-relative instruction containing plt_got_offset. */
860 unsigned int plt_got_insn_size;
862 /* Offset of the end of the PC-relative jump to plt0_entry. */
863 unsigned int plt_plt_insn_end;
865 /* Offset into plt_entry where the initial value of the GOT entry points. */
866 unsigned int plt_lazy_offset;
868 /* .eh_frame covering the lazy .plt section. */
869 const bfd_byte *eh_frame_plt;
870 unsigned int eh_frame_plt_size;
873 struct elf_x86_64_non_lazy_plt_layout
875 /* Template for the lazy PLT entries. */
876 const bfd_byte *plt_entry;
877 unsigned int plt_entry_size; /* Size of each PLT entry. */
879 /* Offsets into plt_entry that are to be replaced with... */
880 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
882 /* Length of the PC-relative instruction containing plt_got_offset. */
883 unsigned int plt_got_insn_size;
885 /* .eh_frame covering the non-lazy .plt section. */
886 const bfd_byte *eh_frame_plt;
887 unsigned int eh_frame_plt_size;
890 struct elf_x86_64_plt_layout
892 /* Template for the PLT entries. */
893 const bfd_byte *plt_entry;
894 unsigned int plt_entry_size; /* Size of each PLT entry. */
897 unsigned int has_plt0;
899 /* Offsets into plt_entry that are to be replaced with... */
900 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
902 /* Length of the PC-relative instruction containing plt_got_offset. */
903 unsigned int plt_got_insn_size;
905 /* .eh_frame covering the .plt section. */
906 const bfd_byte *eh_frame_plt;
907 unsigned int eh_frame_plt_size;
910 /* Architecture-specific backend data for x86-64. */
912 struct elf_x86_64_backend_data
922 #define get_elf_x86_64_arch_data(bed) \
923 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
925 #define get_elf_x86_64_backend_data(abfd) \
926 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
928 /* These are the standard parameters. */
929 static const struct elf_x86_64_lazy_plt_layout elf_x86_64_lazy_plt =
931 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
932 elf_x86_64_lazy_plt_entry, /* plt_entry */
933 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
934 2, /* plt0_got1_offset */
935 8, /* plt0_got2_offset */
936 12, /* plt0_got2_insn_end */
937 2, /* plt_got_offset */
938 7, /* plt_reloc_offset */
939 12, /* plt_plt_offset */
940 6, /* plt_got_insn_size */
941 LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */
942 6, /* plt_lazy_offset */
943 elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */
944 sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */
947 static const struct elf_x86_64_non_lazy_plt_layout elf_x86_64_non_lazy_plt =
949 elf_x86_64_non_lazy_plt_entry, /* plt_entry */
950 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
951 2, /* plt_got_offset */
952 6, /* plt_got_insn_size */
953 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
954 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
957 static const struct elf_x86_64_lazy_plt_layout elf_x86_64_lazy_bnd_plt =
959 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
960 elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */
961 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
962 2, /* plt0_got1_offset */
963 1+8, /* plt0_got2_offset */
964 1+12, /* plt0_got2_insn_end */
965 1+2, /* plt_got_offset */
966 1, /* plt_reloc_offset */
967 7, /* plt_plt_offset */
968 1+6, /* plt_got_insn_size */
969 11, /* plt_plt_insn_end */
970 0, /* plt_lazy_offset */
971 elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */
972 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */
975 static const struct elf_x86_64_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt =
977 elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */
978 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
979 1+2, /* plt_got_offset */
980 1+6, /* plt_got_insn_size */
981 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
982 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
985 static const struct elf_x86_64_lazy_plt_layout elf_x86_64_lazy_ibt_plt =
987 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
988 elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */
989 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
990 2, /* plt0_got1_offset */
991 1+8, /* plt0_got2_offset */
992 1+12, /* plt0_got2_insn_end */
993 4+1+2, /* plt_got_offset */
994 4+1, /* plt_reloc_offset */
995 4+1+6, /* plt_plt_offset */
996 4+1+6, /* plt_got_insn_size */
997 4+1+5+5, /* plt_plt_insn_end */
998 0, /* plt_lazy_offset */
999 elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
1000 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
1003 static const struct elf_x86_64_lazy_plt_layout elf_x32_lazy_ibt_plt =
1005 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
1006 elf_x32_lazy_ibt_plt_entry, /* plt_entry */
1007 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
1008 2, /* plt0_got1_offset */
1009 8, /* plt0_got2_offset */
1010 12, /* plt0_got2_insn_end */
1011 4+2, /* plt_got_offset */
1012 4+1, /* plt_reloc_offset */
1013 4+6, /* plt_plt_offset */
1014 4+6, /* plt_got_insn_size */
1015 4+5+5, /* plt_plt_insn_end */
1016 0, /* plt_lazy_offset */
1017 elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
1018 sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
1021 static const struct elf_x86_64_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt =
1023 elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */
1024 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
1025 4+1+2, /* plt_got_offset */
1026 4+1+6, /* plt_got_insn_size */
1027 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
1028 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
1031 static const struct elf_x86_64_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt =
1033 elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */
1034 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
1035 4+2, /* plt_got_offset */
1036 4+6, /* plt_got_insn_size */
1037 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
1038 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
1041 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
1046 #define elf_backend_arch_data &elf_x86_64_arch_bed
1048 /* Is a undefined weak symbol which is resolved to 0. Reference to an
1049 undefined weak symbol is resolved to 0 when building executable if
1050 it isn't dynamic and
1051 1. Has non-GOT/non-PLT relocations in text section. Or
1052 2. Has no GOT/PLT relocation.
1053 Local undefined weak symbol is always resolved to 0.
1055 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
1056 ((EH)->elf.root.type == bfd_link_hash_undefweak \
1057 && ((EH)->elf.forced_local \
1058 || (bfd_link_executable (INFO) \
1059 && (elf_x86_64_hash_table (INFO)->interp == NULL \
1061 || (EH)->has_non_got_reloc \
1062 || !(INFO)->dynamic_undefined_weak))))
1064 /* x86-64 ELF linker hash entry. */
1066 struct elf_x86_64_link_hash_entry
1068 struct elf_link_hash_entry elf;
1070 /* Track dynamic relocs copied for this symbol. */
1071 struct elf_dyn_relocs *dyn_relocs;
1073 #define GOT_UNKNOWN 0
1074 #define GOT_NORMAL 1
1075 #define GOT_TLS_GD 2
1076 #define GOT_TLS_IE 3
1077 #define GOT_TLS_GDESC 4
1078 #define GOT_TLS_GD_BOTH_P(type) \
1079 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
1080 #define GOT_TLS_GD_P(type) \
1081 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
1082 #define GOT_TLS_GDESC_P(type) \
1083 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
1084 #define GOT_TLS_GD_ANY_P(type) \
1085 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
1086 unsigned char tls_type;
1088 /* TRUE if a weak symbol with a real definition needs a copy reloc.
1089 When there is a weak symbol with a real definition, the processor
1090 independent code will have arranged for us to see the real
1091 definition first. We need to copy the needs_copy bit from the
1092 real definition and check it when allowing copy reloc in PIE. */
1093 unsigned int needs_copy : 1;
1095 /* TRUE if symbol has GOT or PLT relocations. */
1096 unsigned int has_got_reloc : 1;
1098 /* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
1099 unsigned int has_non_got_reloc : 1;
1101 /* Don't call finish_dynamic_symbol on this symbol. */
1102 unsigned int no_finish_dynamic_symbol : 1;
1104 /* TRUE if symbol symbol is __tls_get_addr. */
1105 unsigned int tls_get_addr : 1;
1107 /* Reference count of C/C++ function pointer relocations in read-write
1108 section which can be resolved at run-time. */
1109 bfd_signed_vma func_pointer_refcount;
1111 /* Information about the GOT PLT entry. Filled when there are both
1112 GOT and PLT relocations against the same function. */
1113 union gotplt_union plt_got;
1115 /* Information about the second PLT entry. */
1116 union gotplt_union plt_second;
1118 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
1119 starting at the end of the jump table. */
1120 bfd_vma tlsdesc_got;
1123 #define elf_x86_64_hash_entry(ent) \
1124 ((struct elf_x86_64_link_hash_entry *)(ent))
1126 struct elf_x86_64_obj_tdata
1128 struct elf_obj_tdata root;
1130 /* tls_type for each local got entry. */
1131 char *local_got_tls_type;
1133 /* GOTPLT entries for TLS descriptors. */
1134 bfd_vma *local_tlsdesc_gotent;
1137 #define elf_x86_64_tdata(abfd) \
1138 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
1140 #define elf_x86_64_local_got_tls_type(abfd) \
1141 (elf_x86_64_tdata (abfd)->local_got_tls_type)
1143 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
1144 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
1146 #define is_x86_64_elf(bfd) \
1147 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
1148 && elf_tdata (bfd) != NULL \
1149 && elf_object_id (bfd) == X86_64_ELF_DATA)
1152 elf_x86_64_mkobject (bfd *abfd)
1154 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
1158 /* x86-64 ELF linker hash table. */
1160 struct elf_x86_64_link_hash_table
1162 struct elf_link_hash_table elf;
1164 /* Short-cuts to get to dynamic linker sections. */
1166 asection *plt_eh_frame;
1167 asection *plt_second;
1168 asection *plt_second_eh_frame;
1170 asection *plt_got_eh_frame;
1172 /* Parameters describing PLT generation, lazy or non-lazy. */
1173 struct elf_x86_64_plt_layout plt;
1175 /* Parameters describing lazy PLT generation. */
1176 const struct elf_x86_64_lazy_plt_layout *lazy_plt;
1178 /* Parameters describing non-lazy PLT generation. */
1179 const struct elf_x86_64_non_lazy_plt_layout *non_lazy_plt;
1183 bfd_signed_vma refcount;
1187 /* The amount of space used by the jump slots in the GOT. */
1188 bfd_vma sgotplt_jump_table_size;
1190 /* Small local sym cache. */
1191 struct sym_cache sym_cache;
1193 bfd_vma (*r_info) (bfd_vma, bfd_vma);
1194 bfd_vma (*r_sym) (bfd_vma);
1195 unsigned int pointer_r_type;
1196 const char *dynamic_interpreter;
1197 int dynamic_interpreter_size;
1199 /* _TLS_MODULE_BASE_ symbol. */
1200 struct bfd_link_hash_entry *tls_module_base;
1202 /* Used by local STT_GNU_IFUNC symbols. */
1203 htab_t loc_hash_table;
1204 void * loc_hash_memory;
1206 /* The offset into splt of the PLT entry for the TLS descriptor
1207 resolver. Special values are 0, if not necessary (or not found
1208 to be necessary yet), and -1 if needed but not determined
1210 bfd_vma tlsdesc_plt;
1211 /* The offset into sgot of the GOT entry used by the PLT entry
1213 bfd_vma tlsdesc_got;
1215 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
1216 bfd_vma next_jump_slot_index;
1217 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
1218 bfd_vma next_irelative_index;
1220 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
1221 to read-only sections. */
1222 bfd_boolean readonly_dynrelocs_against_ifunc;
1225 /* Get the x86-64 ELF linker hash table from a link_info structure. */
1227 #define elf_x86_64_hash_table(p) \
1228 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
1229 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
1231 #define elf_x86_64_compute_jump_table_size(htab) \
1232 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
1234 /* Create an entry in an x86-64 ELF linker hash table. */
1236 static struct bfd_hash_entry *
1237 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
1238 struct bfd_hash_table *table,
1241 /* Allocate the structure if it has not already been allocated by a
1245 entry = (struct bfd_hash_entry *)
1246 bfd_hash_allocate (table,
1247 sizeof (struct elf_x86_64_link_hash_entry));
1252 /* Call the allocation method of the superclass. */
1253 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
1256 struct elf_x86_64_link_hash_entry *eh;
1258 eh = (struct elf_x86_64_link_hash_entry *) entry;
1259 eh->dyn_relocs = NULL;
1260 eh->tls_type = GOT_UNKNOWN;
1262 eh->has_got_reloc = 0;
1263 eh->has_non_got_reloc = 0;
1264 eh->no_finish_dynamic_symbol = 0;
1265 eh->tls_get_addr = 0;
1266 eh->func_pointer_refcount = 0;
1267 eh->plt_second.offset = (bfd_vma) -1;
1268 eh->plt_got.offset = (bfd_vma) -1;
1269 eh->tlsdesc_got = (bfd_vma) -1;
1275 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
1276 for local symbol so that we can handle local STT_GNU_IFUNC symbols
1277 as global symbol. We reuse indx and dynstr_index for local symbol
1278 hash since they aren't used by global symbols in this backend. */
1281 elf_x86_64_local_htab_hash (const void *ptr)
1283 struct elf_link_hash_entry *h
1284 = (struct elf_link_hash_entry *) ptr;
1285 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
1288 /* Compare local hash entries. */
1291 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
1293 struct elf_link_hash_entry *h1
1294 = (struct elf_link_hash_entry *) ptr1;
1295 struct elf_link_hash_entry *h2
1296 = (struct elf_link_hash_entry *) ptr2;
1298 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
1301 /* Find and/or create a hash entry for local symbol. */
1303 static struct elf_link_hash_entry *
1304 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
1305 bfd *abfd, const Elf_Internal_Rela *rel,
1308 struct elf_x86_64_link_hash_entry e, *ret;
1309 asection *sec = abfd->sections;
1310 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
1311 htab->r_sym (rel->r_info));
1314 e.elf.indx = sec->id;
1315 e.elf.dynstr_index = htab->r_sym (rel->r_info);
1316 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
1317 create ? INSERT : NO_INSERT);
1324 ret = (struct elf_x86_64_link_hash_entry *) *slot;
1328 ret = (struct elf_x86_64_link_hash_entry *)
1329 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
1330 sizeof (struct elf_x86_64_link_hash_entry));
1333 memset (ret, 0, sizeof (*ret));
1334 ret->elf.indx = sec->id;
1335 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
1336 ret->elf.dynindx = -1;
1337 ret->func_pointer_refcount = 0;
1338 ret->plt_got.offset = (bfd_vma) -1;
1344 /* Destroy an X86-64 ELF linker hash table. */
1347 elf_x86_64_link_hash_table_free (bfd *obfd)
1349 struct elf_x86_64_link_hash_table *htab
1350 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
1352 if (htab->loc_hash_table)
1353 htab_delete (htab->loc_hash_table);
1354 if (htab->loc_hash_memory)
1355 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1356 _bfd_elf_link_hash_table_free (obfd);
1359 /* Create an X86-64 ELF linker hash table. */
1361 static struct bfd_link_hash_table *
1362 elf_x86_64_link_hash_table_create (bfd *abfd)
1364 struct elf_x86_64_link_hash_table *ret;
1365 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
1367 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
1371 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1372 elf_x86_64_link_hash_newfunc,
1373 sizeof (struct elf_x86_64_link_hash_entry),
1380 if (ABI_64_P (abfd))
1382 ret->r_info = elf64_r_info;
1383 ret->r_sym = elf64_r_sym;
1384 ret->pointer_r_type = R_X86_64_64;
1385 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1386 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1390 ret->r_info = elf32_r_info;
1391 ret->r_sym = elf32_r_sym;
1392 ret->pointer_r_type = R_X86_64_32;
1393 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1394 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1397 ret->loc_hash_table = htab_try_create (1024,
1398 elf_x86_64_local_htab_hash,
1399 elf_x86_64_local_htab_eq,
1401 ret->loc_hash_memory = objalloc_create ();
1402 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1404 elf_x86_64_link_hash_table_free (abfd);
1407 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1409 return &ret->elf.root;
1412 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1415 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1416 struct elf_link_hash_entry *dir,
1417 struct elf_link_hash_entry *ind)
1419 struct elf_x86_64_link_hash_entry *edir, *eind;
1421 edir = (struct elf_x86_64_link_hash_entry *) dir;
1422 eind = (struct elf_x86_64_link_hash_entry *) ind;
1424 edir->has_got_reloc |= eind->has_got_reloc;
1425 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1427 if (eind->dyn_relocs != NULL)
1429 if (edir->dyn_relocs != NULL)
1431 struct elf_dyn_relocs **pp;
1432 struct elf_dyn_relocs *p;
1434 /* Add reloc counts against the indirect sym to the direct sym
1435 list. Merge any entries against the same section. */
1436 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1438 struct elf_dyn_relocs *q;
1440 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1441 if (q->sec == p->sec)
1443 q->pc_count += p->pc_count;
1444 q->count += p->count;
1451 *pp = edir->dyn_relocs;
1454 edir->dyn_relocs = eind->dyn_relocs;
1455 eind->dyn_relocs = NULL;
1458 if (ind->root.type == bfd_link_hash_indirect
1459 && dir->got.refcount <= 0)
1461 edir->tls_type = eind->tls_type;
1462 eind->tls_type = GOT_UNKNOWN;
1465 if (ELIMINATE_COPY_RELOCS
1466 && ind->root.type != bfd_link_hash_indirect
1467 && dir->dynamic_adjusted)
1469 /* If called to transfer flags for a weakdef during processing
1470 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1471 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1472 if (dir->versioned != versioned_hidden)
1473 dir->ref_dynamic |= ind->ref_dynamic;
1474 dir->ref_regular |= ind->ref_regular;
1475 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1476 dir->needs_plt |= ind->needs_plt;
1477 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1481 if (eind->func_pointer_refcount > 0)
1483 edir->func_pointer_refcount += eind->func_pointer_refcount;
1484 eind->func_pointer_refcount = 0;
1487 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1492 elf64_x86_64_elf_object_p (bfd *abfd)
1494 /* Set the right machine number for an x86-64 elf64 file. */
1495 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1500 elf32_x86_64_elf_object_p (bfd *abfd)
1502 /* Set the right machine number for an x86-64 elf32 file. */
1503 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1507 /* Return TRUE if the TLS access code sequence support transition
1511 elf_x86_64_check_tls_transition (bfd *abfd,
1512 struct bfd_link_info *info,
1515 Elf_Internal_Shdr *symtab_hdr,
1516 struct elf_link_hash_entry **sym_hashes,
1517 unsigned int r_type,
1518 const Elf_Internal_Rela *rel,
1519 const Elf_Internal_Rela *relend)
1522 unsigned long r_symndx;
1523 bfd_boolean largepic = FALSE;
1524 struct elf_link_hash_entry *h;
1526 struct elf_x86_64_link_hash_table *htab;
1528 bfd_boolean indirect_call;
1530 htab = elf_x86_64_hash_table (info);
1531 offset = rel->r_offset;
1534 case R_X86_64_TLSGD:
1535 case R_X86_64_TLSLD:
1536 if ((rel + 1) >= relend)
1539 if (r_type == R_X86_64_TLSGD)
1541 /* Check transition from GD access model. For 64bit, only
1542 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1543 .word 0x6666; rex64; call __tls_get_addr@PLT
1545 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1547 call *__tls_get_addr@GOTPCREL(%rip)
1548 which may be converted to
1549 addr32 call __tls_get_addr
1550 can transit to different access model. For 32bit, only
1551 leaq foo@tlsgd(%rip), %rdi
1552 .word 0x6666; rex64; call __tls_get_addr@PLT
1554 leaq foo@tlsgd(%rip), %rdi
1556 call *__tls_get_addr@GOTPCREL(%rip)
1557 which may be converted to
1558 addr32 call __tls_get_addr
1559 can transit to different access model. For largepic,
1561 leaq foo@tlsgd(%rip), %rdi
1562 movabsq $__tls_get_addr@pltoff, %rax
1566 leaq foo@tlsgd(%rip), %rdi
1567 movabsq $__tls_get_addr@pltoff, %rax
1571 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1573 if ((offset + 12) > sec->size)
1576 call = contents + offset + 4;
1578 || !((call[1] == 0x48
1586 && call[3] == 0xe8)))
1588 if (!ABI_64_P (abfd)
1589 || (offset + 19) > sec->size
1591 || memcmp (call - 7, leaq + 1, 3) != 0
1592 || memcmp (call, "\x48\xb8", 2) != 0
1596 || !((call[10] == 0x48 && call[12] == 0xd8)
1597 || (call[10] == 0x4c && call[12] == 0xf8)))
1601 else if (ABI_64_P (abfd))
1604 || memcmp (contents + offset - 4, leaq, 4) != 0)
1610 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1613 indirect_call = call[2] == 0xff;
1617 /* Check transition from LD access model. Only
1618 leaq foo@tlsld(%rip), %rdi;
1619 call __tls_get_addr@PLT
1621 leaq foo@tlsld(%rip), %rdi;
1622 call *__tls_get_addr@GOTPCREL(%rip)
1623 which may be converted to
1624 addr32 call __tls_get_addr
1625 can transit to different access model. For largepic
1627 leaq foo@tlsld(%rip), %rdi
1628 movabsq $__tls_get_addr@pltoff, %rax
1632 leaq foo@tlsld(%rip), %rdi
1633 movabsq $__tls_get_addr@pltoff, %rax
1637 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1639 if (offset < 3 || (offset + 9) > sec->size)
1642 if (memcmp (contents + offset - 3, lea, 3) != 0)
1645 call = contents + offset + 4;
1646 if (!(call[0] == 0xe8
1647 || (call[0] == 0xff && call[1] == 0x15)
1648 || (call[0] == 0x67 && call[1] == 0xe8)))
1650 if (!ABI_64_P (abfd)
1651 || (offset + 19) > sec->size
1652 || memcmp (call, "\x48\xb8", 2) != 0
1656 || !((call[10] == 0x48 && call[12] == 0xd8)
1657 || (call[10] == 0x4c && call[12] == 0xf8)))
1661 indirect_call = call[0] == 0xff;
1664 r_symndx = htab->r_sym (rel[1].r_info);
1665 if (r_symndx < symtab_hdr->sh_info)
1668 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1670 || !((struct elf_x86_64_link_hash_entry *) h)->tls_get_addr)
1673 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64;
1674 else if (indirect_call)
1675 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_GOTPCRELX;
1677 return (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1678 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
1680 case R_X86_64_GOTTPOFF:
1681 /* Check transition from IE access model:
1682 mov foo@gottpoff(%rip), %reg
1683 add foo@gottpoff(%rip), %reg
1686 /* Check REX prefix first. */
1687 if (offset >= 3 && (offset + 4) <= sec->size)
1689 val = bfd_get_8 (abfd, contents + offset - 3);
1690 if (val != 0x48 && val != 0x4c)
1692 /* X32 may have 0x44 REX prefix or no REX prefix. */
1693 if (ABI_64_P (abfd))
1699 /* X32 may not have any REX prefix. */
1700 if (ABI_64_P (abfd))
1702 if (offset < 2 || (offset + 3) > sec->size)
1706 val = bfd_get_8 (abfd, contents + offset - 2);
1707 if (val != 0x8b && val != 0x03)
1710 val = bfd_get_8 (abfd, contents + offset - 1);
1711 return (val & 0xc7) == 5;
1713 case R_X86_64_GOTPC32_TLSDESC:
1714 /* Check transition from GDesc access model:
1715 leaq x@tlsdesc(%rip), %rax
1717 Make sure it's a leaq adding rip to a 32-bit offset
1718 into any register, although it's probably almost always
1721 if (offset < 3 || (offset + 4) > sec->size)
1724 val = bfd_get_8 (abfd, contents + offset - 3);
1725 if ((val & 0xfb) != 0x48)
1728 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1731 val = bfd_get_8 (abfd, contents + offset - 1);
1732 return (val & 0xc7) == 0x05;
1734 case R_X86_64_TLSDESC_CALL:
1735 /* Check transition from GDesc access model:
1736 call *x@tlsdesc(%rax)
1738 if (offset + 2 <= sec->size)
1740 /* Make sure that it's a call *x@tlsdesc(%rax). */
1741 call = contents + offset;
1742 return call[0] == 0xff && call[1] == 0x10;
1752 /* Return TRUE if the TLS access transition is OK or no transition
1753 will be performed. Update R_TYPE if there is a transition. */
1756 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1757 asection *sec, bfd_byte *contents,
1758 Elf_Internal_Shdr *symtab_hdr,
1759 struct elf_link_hash_entry **sym_hashes,
1760 unsigned int *r_type, int tls_type,
1761 const Elf_Internal_Rela *rel,
1762 const Elf_Internal_Rela *relend,
1763 struct elf_link_hash_entry *h,
1764 unsigned long r_symndx,
1765 bfd_boolean from_relocate_section)
1767 unsigned int from_type = *r_type;
1768 unsigned int to_type = from_type;
1769 bfd_boolean check = TRUE;
1771 /* Skip TLS transition for functions. */
1773 && (h->type == STT_FUNC
1774 || h->type == STT_GNU_IFUNC))
1779 case R_X86_64_TLSGD:
1780 case R_X86_64_GOTPC32_TLSDESC:
1781 case R_X86_64_TLSDESC_CALL:
1782 case R_X86_64_GOTTPOFF:
1783 if (bfd_link_executable (info))
1786 to_type = R_X86_64_TPOFF32;
1788 to_type = R_X86_64_GOTTPOFF;
1791 /* When we are called from elf_x86_64_relocate_section, there may
1792 be additional transitions based on TLS_TYPE. */
1793 if (from_relocate_section)
1795 unsigned int new_to_type = to_type;
1797 if (bfd_link_executable (info)
1800 && tls_type == GOT_TLS_IE)
1801 new_to_type = R_X86_64_TPOFF32;
1803 if (to_type == R_X86_64_TLSGD
1804 || to_type == R_X86_64_GOTPC32_TLSDESC
1805 || to_type == R_X86_64_TLSDESC_CALL)
1807 if (tls_type == GOT_TLS_IE)
1808 new_to_type = R_X86_64_GOTTPOFF;
1811 /* We checked the transition before when we were called from
1812 elf_x86_64_check_relocs. We only want to check the new
1813 transition which hasn't been checked before. */
1814 check = new_to_type != to_type && from_type == to_type;
1815 to_type = new_to_type;
1820 case R_X86_64_TLSLD:
1821 if (bfd_link_executable (info))
1822 to_type = R_X86_64_TPOFF32;
1829 /* Return TRUE if there is no transition. */
1830 if (from_type == to_type)
1833 /* Check if the transition can be performed. */
1835 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1836 symtab_hdr, sym_hashes,
1837 from_type, rel, relend))
1839 reloc_howto_type *from, *to;
1842 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1843 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1846 name = h->root.root.string;
1849 struct elf_x86_64_link_hash_table *htab;
1851 htab = elf_x86_64_hash_table (info);
1856 Elf_Internal_Sym *isym;
1858 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1860 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1865 /* xgettext:c-format */
1866 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1867 "in section `%A' failed"),
1868 abfd, from->name, to->name, name, rel->r_offset, sec);
1869 bfd_set_error (bfd_error_bad_value);
1877 /* Rename some of the generic section flags to better document how they
1879 #define need_convert_load sec_flg0
1880 #define check_relocs_failed sec_flg1
1883 elf_x86_64_need_pic (struct bfd_link_info *info,
1884 bfd *input_bfd, asection *sec,
1885 struct elf_link_hash_entry *h,
1886 Elf_Internal_Shdr *symtab_hdr,
1887 Elf_Internal_Sym *isym,
1888 reloc_howto_type *howto)
1891 const char *und = "";
1892 const char *pic = "";
1898 name = h->root.root.string;
1899 switch (ELF_ST_VISIBILITY (h->other))
1902 v = _("hidden symbol ");
1905 v = _("internal symbol ");
1908 v = _("protected symbol ");
1912 pic = _("; recompile with -fPIC");
1916 if (!h->def_regular && !h->def_dynamic)
1917 und = _("undefined ");
1921 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
1922 pic = _("; recompile with -fPIC");
1925 if (bfd_link_dll (info))
1926 object = _("a shared object");
1927 else if (bfd_link_pie (info))
1928 object = _("a PIE object");
1930 object = _("a PDE object");
1932 /* xgettext:c-format */
1933 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1934 "not be used when making %s%s"),
1935 input_bfd, howto->name, und, v, name,
1937 bfd_set_error (bfd_error_bad_value);
1938 sec->check_relocs_failed = 1;
1942 /* With the local symbol, foo, we convert
1943 mov foo@GOTPCREL(%rip), %reg
1947 call/jmp *foo@GOTPCREL(%rip)
1949 nop call foo/jmp foo nop
1950 When PIC is false, convert
1951 test %reg, foo@GOTPCREL(%rip)
1955 binop foo@GOTPCREL(%rip), %reg
1958 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1962 elf_x86_64_convert_load_reloc (bfd *abfd, asection *sec,
1964 Elf_Internal_Rela *irel,
1965 struct elf_link_hash_entry *h,
1966 bfd_boolean *converted,
1967 struct bfd_link_info *link_info)
1969 struct elf_x86_64_link_hash_table *htab;
1971 bfd_boolean require_reloc_pc32;
1973 bfd_boolean to_reloc_pc32;
1976 bfd_signed_vma raddend;
1977 unsigned int opcode;
1979 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
1980 unsigned int r_symndx;
1982 bfd_vma roff = irel->r_offset;
1984 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
1987 raddend = irel->r_addend;
1988 /* Addend for 32-bit PC-relative relocation must be -4. */
1992 htab = elf_x86_64_hash_table (link_info);
1993 is_pic = bfd_link_pic (link_info);
1995 relocx = (r_type == R_X86_64_GOTPCRELX
1996 || r_type == R_X86_64_REX_GOTPCRELX);
1998 /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
2001 = link_info->disable_target_specific_optimizations > 1;
2003 r_symndx = htab->r_sym (irel->r_info);
2005 opcode = bfd_get_8 (abfd, contents + roff - 2);
2007 /* Convert mov to lea since it has been done for a while. */
2010 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
2011 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
2012 test, xor instructions. */
2017 /* We convert only to R_X86_64_PC32:
2019 2. R_X86_64_GOTPCREL since we can't modify REX byte.
2020 3. require_reloc_pc32 is true.
2023 to_reloc_pc32 = (opcode == 0xff
2025 || require_reloc_pc32
2028 /* Get the symbol referred to by the reloc. */
2031 Elf_Internal_Sym *isym
2032 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
2034 /* Skip relocation against undefined symbols. */
2035 if (isym->st_shndx == SHN_UNDEF)
2038 symtype = ELF_ST_TYPE (isym->st_info);
2040 if (isym->st_shndx == SHN_ABS)
2041 tsec = bfd_abs_section_ptr;
2042 else if (isym->st_shndx == SHN_COMMON)
2043 tsec = bfd_com_section_ptr;
2044 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
2045 tsec = &_bfd_elf_large_com_section;
2047 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2049 toff = isym->st_value;
2053 /* Undefined weak symbol is only bound locally in executable
2054 and its reference is resolved as 0 without relocation
2055 overflow. We can only perform this optimization for
2056 GOTPCRELX relocations since we need to modify REX byte.
2057 It is OK convert mov with R_X86_64_GOTPCREL to
2059 if ((relocx || opcode == 0x8b)
2060 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
2062 elf_x86_64_hash_entry (h)))
2066 /* Skip for branch instructions since R_X86_64_PC32
2068 if (require_reloc_pc32)
2073 /* For non-branch instructions, we can convert to
2074 R_X86_64_32/R_X86_64_32S since we know if there
2076 to_reloc_pc32 = FALSE;
2079 /* Since we don't know the current PC when PIC is true,
2080 we can't convert to R_X86_64_PC32. */
2081 if (to_reloc_pc32 && is_pic)
2086 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
2087 ld.so may use its link-time address. */
2088 else if (h->start_stop
2090 || h->root.type == bfd_link_hash_defined
2091 || h->root.type == bfd_link_hash_defweak)
2092 && h != htab->elf.hdynamic
2093 && SYMBOL_REFERENCES_LOCAL (link_info, h)))
2095 /* bfd_link_hash_new or bfd_link_hash_undefined is
2096 set by an assignment in a linker script in
2097 bfd_elf_record_link_assignment. start_stop is set
2098 on __start_SECNAME/__stop_SECNAME which mark section
2102 && (h->root.type == bfd_link_hash_new
2103 || h->root.type == bfd_link_hash_undefined
2104 || ((h->root.type == bfd_link_hash_defined
2105 || h->root.type == bfd_link_hash_defweak)
2106 && h->root.u.def.section == bfd_und_section_ptr))))
2108 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
2109 if (require_reloc_pc32)
2113 tsec = h->root.u.def.section;
2114 toff = h->root.u.def.value;
2121 /* Don't convert GOTPCREL relocation against large section. */
2122 if (elf_section_data (tsec) != NULL
2123 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
2126 /* We can only estimate relocation overflow for R_X86_64_PC32. */
2130 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
2132 /* At this stage in linking, no SEC_MERGE symbol has been
2133 adjusted, so all references to such symbols need to be
2134 passed through _bfd_merged_section_offset. (Later, in
2135 relocate_section, all SEC_MERGE symbols *except* for
2136 section symbols have been adjusted.)
2138 gas may reduce relocations against symbols in SEC_MERGE
2139 sections to a relocation against the section symbol when
2140 the original addend was zero. When the reloc is against
2141 a section symbol we should include the addend in the
2142 offset passed to _bfd_merged_section_offset, since the
2143 location of interest is the original symbol. On the
2144 other hand, an access to "sym+addend" where "sym" is not
2145 a section symbol should not include the addend; Such an
2146 access is presumed to be an offset from "sym"; The
2147 location of interest is just "sym". */
2148 if (symtype == STT_SECTION)
2151 toff = _bfd_merged_section_offset (abfd, &tsec,
2152 elf_section_data (tsec)->sec_info,
2155 if (symtype != STT_SECTION)
2161 /* Don't convert if R_X86_64_PC32 relocation overflows. */
2162 if (tsec->output_section == sec->output_section)
2164 if ((toff - roff + 0x80000000) > 0xffffffff)
2169 bfd_signed_vma distance;
2171 /* At this point, we don't know the load addresses of TSEC
2172 section nor SEC section. We estimate the distrance between
2173 SEC and TSEC. We store the estimated distances in the
2174 compressed_size field of the output section, which is only
2175 used to decompress the compressed input section. */
2176 if (sec->output_section->compressed_size == 0)
2179 bfd_size_type size = 0;
2180 for (asect = link_info->output_bfd->sections;
2182 asect = asect->next)
2183 /* Skip debug sections since compressed_size is used to
2184 compress debug sections. */
2185 if ((asect->flags & SEC_DEBUGGING) == 0)
2188 for (i = asect->map_head.s;
2192 size = align_power (size, i->alignment_power);
2195 asect->compressed_size = size;
2199 /* Don't convert GOTPCREL relocations if TSEC isn't placed
2201 distance = (tsec->output_section->compressed_size
2202 - sec->output_section->compressed_size);
2206 /* Take PT_GNU_RELRO segment into account by adding
2208 if ((toff + distance + get_elf_backend_data (abfd)->maxpagesize
2209 - roff + 0x80000000) > 0xffffffff)
2216 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
2221 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
2223 modrm = bfd_get_8 (abfd, contents + roff - 1);
2226 /* Convert to "jmp foo nop". */
2229 nop_offset = irel->r_offset + 3;
2230 disp = bfd_get_32 (abfd, contents + irel->r_offset);
2231 irel->r_offset -= 1;
2232 bfd_put_32 (abfd, disp, contents + irel->r_offset);
2236 struct elf_x86_64_link_hash_entry *eh
2237 = (struct elf_x86_64_link_hash_entry *) h;
2239 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2242 /* To support TLS optimization, always use addr32 prefix for
2243 "call *__tls_get_addr@GOTPCREL(%rip)". */
2244 if (eh && eh->tls_get_addr)
2247 nop_offset = irel->r_offset - 2;
2251 nop = link_info->call_nop_byte;
2252 if (link_info->call_nop_as_suffix)
2254 nop_offset = irel->r_offset + 3;
2255 disp = bfd_get_32 (abfd, contents + irel->r_offset);
2256 irel->r_offset -= 1;
2257 bfd_put_32 (abfd, disp, contents + irel->r_offset);
2260 nop_offset = irel->r_offset - 2;
2263 bfd_put_8 (abfd, nop, contents + nop_offset);
2264 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
2265 r_type = R_X86_64_PC32;
2270 unsigned int rex_mask = REX_R;
2272 if (r_type == R_X86_64_REX_GOTPCRELX)
2273 rex = bfd_get_8 (abfd, contents + roff - 3);
2281 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2282 "lea foo(%rip), %reg". */
2284 r_type = R_X86_64_PC32;
2288 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2289 "mov $foo, %reg". */
2291 modrm = bfd_get_8 (abfd, contents + roff - 1);
2292 modrm = 0xc0 | (modrm & 0x38) >> 3;
2293 if ((rex & REX_W) != 0
2294 && ABI_64_P (link_info->output_bfd))
2296 /* Keep the REX_W bit in REX byte for LP64. */
2297 r_type = R_X86_64_32S;
2298 goto rewrite_modrm_rex;
2302 /* If the REX_W bit in REX byte isn't needed,
2303 use R_X86_64_32 and clear the W bit to avoid
2304 sign-extend imm32 to imm64. */
2305 r_type = R_X86_64_32;
2306 /* Clear the W bit in REX byte. */
2308 goto rewrite_modrm_rex;
2314 /* R_X86_64_PC32 isn't supported. */
2318 modrm = bfd_get_8 (abfd, contents + roff - 1);
2321 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
2322 "test $foo, %reg". */
2323 modrm = 0xc0 | (modrm & 0x38) >> 3;
2328 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
2329 "binop $foo, %reg". */
2330 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
2334 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
2335 overflow when sign-extending imm32 to imm64. */
2336 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
2339 bfd_put_8 (abfd, modrm, contents + roff - 1);
2343 /* Move the R bit to the B bit in REX byte. */
2344 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
2345 bfd_put_8 (abfd, rex, contents + roff - 3);
2348 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
2352 bfd_put_8 (abfd, opcode, contents + roff - 2);
2355 irel->r_info = htab->r_info (r_symndx, r_type);
2362 /* Look through the relocs for a section during the first phase, and
2363 calculate needed space in the global offset table, procedure
2364 linkage table, and dynamic reloc sections. */
2367 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
2369 const Elf_Internal_Rela *relocs)
2371 struct elf_x86_64_link_hash_table *htab;
2372 Elf_Internal_Shdr *symtab_hdr;
2373 struct elf_link_hash_entry **sym_hashes;
2374 const Elf_Internal_Rela *rel;
2375 const Elf_Internal_Rela *rel_end;
2379 if (bfd_link_relocatable (info))
2382 /* Don't do anything special with non-loaded, non-alloced sections.
2383 In particular, any relocs in such sections should not affect GOT
2384 and PLT reference counting (ie. we don't allow them to create GOT
2385 or PLT entries), there's no possibility or desire to optimize TLS
2386 relocs, and there's not much point in propagating relocs to shared
2387 libs that the dynamic linker won't relocate. */
2388 if ((sec->flags & SEC_ALLOC) == 0)
2391 BFD_ASSERT (is_x86_64_elf (abfd));
2393 htab = elf_x86_64_hash_table (info);
2396 sec->check_relocs_failed = 1;
2400 /* Get the section contents. */
2401 if (elf_section_data (sec)->this_hdr.contents != NULL)
2402 contents = elf_section_data (sec)->this_hdr.contents;
2403 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2405 sec->check_relocs_failed = 1;
2409 symtab_hdr = &elf_symtab_hdr (abfd);
2410 sym_hashes = elf_sym_hashes (abfd);
2414 rel_end = relocs + sec->reloc_count;
2415 for (rel = relocs; rel < rel_end; rel++)
2417 unsigned int r_type;
2418 unsigned int r_symndx;
2419 struct elf_link_hash_entry *h;
2420 struct elf_x86_64_link_hash_entry *eh;
2421 Elf_Internal_Sym *isym;
2423 bfd_boolean size_reloc;
2425 r_symndx = htab->r_sym (rel->r_info);
2426 r_type = ELF32_R_TYPE (rel->r_info);
2428 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
2430 /* xgettext:c-format */
2431 _bfd_error_handler (_("%B: bad symbol index: %d"),
2436 if (r_symndx < symtab_hdr->sh_info)
2438 /* A local symbol. */
2439 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2444 /* Check relocation against local STT_GNU_IFUNC symbol. */
2445 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2447 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
2452 /* Fake a STT_GNU_IFUNC symbol. */
2453 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
2455 h->type = STT_GNU_IFUNC;
2458 h->forced_local = 1;
2459 h->root.type = bfd_link_hash_defined;
2467 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2468 while (h->root.type == bfd_link_hash_indirect
2469 || h->root.type == bfd_link_hash_warning)
2470 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2473 /* Check invalid x32 relocations. */
2474 if (!ABI_64_P (abfd))
2480 case R_X86_64_DTPOFF64:
2481 case R_X86_64_TPOFF64:
2483 case R_X86_64_GOTOFF64:
2484 case R_X86_64_GOT64:
2485 case R_X86_64_GOTPCREL64:
2486 case R_X86_64_GOTPC64:
2487 case R_X86_64_GOTPLT64:
2488 case R_X86_64_PLTOFF64:
2491 name = h->root.root.string;
2493 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2496 /* xgettext:c-format */
2497 (_("%B: relocation %s against symbol `%s' isn't "
2498 "supported in x32 mode"), abfd,
2499 x86_64_elf_howto_table[r_type].name, name);
2500 bfd_set_error (bfd_error_bad_value);
2508 /* It is referenced by a non-shared object. */
2510 h->root.non_ir_ref_regular = 1;
2512 if (h->type == STT_GNU_IFUNC)
2513 elf_tdata (info->output_bfd)->has_gnu_symbols
2514 |= elf_gnu_symbol_ifunc;
2517 if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
2518 symtab_hdr, sym_hashes,
2519 &r_type, GOT_UNKNOWN,
2520 rel, rel_end, h, r_symndx, FALSE))
2523 eh = (struct elf_x86_64_link_hash_entry *) h;
2526 case R_X86_64_TLSLD:
2527 htab->tls_ld_got.refcount += 1;
2530 case R_X86_64_TPOFF32:
2531 if (!bfd_link_executable (info) && ABI_64_P (abfd))
2532 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2533 &x86_64_elf_howto_table[r_type]);
2535 eh->has_got_reloc = 1;
2538 case R_X86_64_GOTTPOFF:
2539 if (!bfd_link_executable (info))
2540 info->flags |= DF_STATIC_TLS;
2543 case R_X86_64_GOT32:
2544 case R_X86_64_GOTPCREL:
2545 case R_X86_64_GOTPCRELX:
2546 case R_X86_64_REX_GOTPCRELX:
2547 case R_X86_64_TLSGD:
2548 case R_X86_64_GOT64:
2549 case R_X86_64_GOTPCREL64:
2550 case R_X86_64_GOTPLT64:
2551 case R_X86_64_GOTPC32_TLSDESC:
2552 case R_X86_64_TLSDESC_CALL:
2553 /* This symbol requires a global offset table entry. */
2555 int tls_type, old_tls_type;
2559 default: tls_type = GOT_NORMAL; break;
2560 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
2561 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
2562 case R_X86_64_GOTPC32_TLSDESC:
2563 case R_X86_64_TLSDESC_CALL:
2564 tls_type = GOT_TLS_GDESC; break;
2569 h->got.refcount += 1;
2570 old_tls_type = eh->tls_type;
2574 bfd_signed_vma *local_got_refcounts;
2576 /* This is a global offset table entry for a local symbol. */
2577 local_got_refcounts = elf_local_got_refcounts (abfd);
2578 if (local_got_refcounts == NULL)
2582 size = symtab_hdr->sh_info;
2583 size *= sizeof (bfd_signed_vma)
2584 + sizeof (bfd_vma) + sizeof (char);
2585 local_got_refcounts = ((bfd_signed_vma *)
2586 bfd_zalloc (abfd, size));
2587 if (local_got_refcounts == NULL)
2589 elf_local_got_refcounts (abfd) = local_got_refcounts;
2590 elf_x86_64_local_tlsdesc_gotent (abfd)
2591 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2592 elf_x86_64_local_got_tls_type (abfd)
2593 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2595 local_got_refcounts[r_symndx] += 1;
2597 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
2600 /* If a TLS symbol is accessed using IE at least once,
2601 there is no point to use dynamic model for it. */
2602 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2603 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2604 || tls_type != GOT_TLS_IE))
2606 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
2607 tls_type = old_tls_type;
2608 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2609 && GOT_TLS_GD_ANY_P (tls_type))
2610 tls_type |= old_tls_type;
2614 name = h->root.root.string;
2616 name = bfd_elf_sym_name (abfd, symtab_hdr,
2619 /* xgettext:c-format */
2620 (_("%B: '%s' accessed both as normal and"
2621 " thread local symbol"),
2623 bfd_set_error (bfd_error_bad_value);
2628 if (old_tls_type != tls_type)
2631 eh->tls_type = tls_type;
2633 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
2638 case R_X86_64_GOTOFF64:
2639 case R_X86_64_GOTPC32:
2640 case R_X86_64_GOTPC64:
2643 eh->has_got_reloc = 1;
2646 case R_X86_64_PLT32:
2647 case R_X86_64_PLT32_BND:
2648 /* This symbol requires a procedure linkage table entry. We
2649 actually build the entry in adjust_dynamic_symbol,
2650 because this might be a case of linking PIC code which is
2651 never referenced by a dynamic object, in which case we
2652 don't need to generate a procedure linkage table entry
2655 /* If this is a local symbol, we resolve it directly without
2656 creating a procedure linkage table entry. */
2660 eh->has_got_reloc = 1;
2662 h->plt.refcount += 1;
2665 case R_X86_64_PLTOFF64:
2666 /* This tries to form the 'address' of a function relative
2667 to GOT. For global symbols we need a PLT entry. */
2671 h->plt.refcount += 1;
2675 case R_X86_64_SIZE32:
2676 case R_X86_64_SIZE64:
2681 if (!ABI_64_P (abfd))
2687 /* Check relocation overflow as these relocs may lead to
2688 run-time relocation overflow. Don't error out for
2689 sections we don't care about, such as debug sections or
2690 when relocation overflow check is disabled. */
2691 if (!info->no_reloc_overflow_check
2692 && (bfd_link_pic (info)
2693 || (bfd_link_executable (info)
2697 && (sec->flags & SEC_READONLY) == 0)))
2698 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2699 &x86_64_elf_howto_table[r_type]);
2705 case R_X86_64_PC32_BND:
2709 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2710 eh->has_non_got_reloc = 1;
2711 /* We are called after all symbols have been resolved. Only
2712 relocation against STT_GNU_IFUNC symbol must go through
2715 && (bfd_link_executable (info)
2716 || h->type == STT_GNU_IFUNC))
2718 /* If this reloc is in a read-only section, we might
2719 need a copy reloc. We can't check reliably at this
2720 stage whether the section is read-only, as input
2721 sections have not yet been mapped to output sections.
2722 Tentatively set the flag for now, and correct in
2723 adjust_dynamic_symbol. */
2726 /* We may need a .plt entry if the symbol is a function
2727 defined in a shared lib or is a STT_GNU_IFUNC function
2728 referenced from the code or read-only section. */
2730 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2731 h->plt.refcount += 1;
2733 if (r_type == R_X86_64_PC32)
2735 /* Since something like ".long foo - ." may be used
2736 as pointer, make sure that PLT is used if foo is
2737 a function defined in a shared library. */
2738 if ((sec->flags & SEC_CODE) == 0)
2739 h->pointer_equality_needed = 1;
2741 else if (r_type != R_X86_64_PC32_BND
2742 && r_type != R_X86_64_PC64)
2744 h->pointer_equality_needed = 1;
2745 /* At run-time, R_X86_64_64 can be resolved for both
2746 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2747 can only be resolved for x32. */
2748 if ((sec->flags & SEC_READONLY) == 0
2749 && (r_type == R_X86_64_64
2750 || (!ABI_64_P (abfd)
2751 && (r_type == R_X86_64_32
2752 || r_type == R_X86_64_32S))))
2753 eh->func_pointer_refcount += 1;
2759 /* If we are creating a shared library, and this is a reloc
2760 against a global symbol, or a non PC relative reloc
2761 against a local symbol, then we need to copy the reloc
2762 into the shared library. However, if we are linking with
2763 -Bsymbolic, we do not need to copy a reloc against a
2764 global symbol which is defined in an object we are
2765 including in the link (i.e., DEF_REGULAR is set). At
2766 this point we have not seen all the input files, so it is
2767 possible that DEF_REGULAR is not set now but will be set
2768 later (it is never cleared). In case of a weak definition,
2769 DEF_REGULAR may be cleared later by a strong definition in
2770 a shared library. We account for that possibility below by
2771 storing information in the relocs_copied field of the hash
2772 table entry. A similar situation occurs when creating
2773 shared libraries and symbol visibility changes render the
2776 If on the other hand, we are creating an executable, we
2777 may need to keep relocations for symbols satisfied by a
2778 dynamic library if we manage to avoid copy relocs for the
2781 Generate dynamic pointer relocation against STT_GNU_IFUNC
2782 symbol in the non-code section. */
2783 if ((bfd_link_pic (info)
2784 && (! IS_X86_64_PCREL_TYPE (r_type)
2786 && (! (bfd_link_pie (info)
2787 || SYMBOLIC_BIND (info, h))
2788 || h->root.type == bfd_link_hash_defweak
2789 || !h->def_regular))))
2791 && h->type == STT_GNU_IFUNC
2792 && r_type == htab->pointer_r_type
2793 && (sec->flags & SEC_CODE) == 0)
2794 || (ELIMINATE_COPY_RELOCS
2795 && !bfd_link_pic (info)
2797 && (h->root.type == bfd_link_hash_defweak
2798 || !h->def_regular)))
2800 struct elf_dyn_relocs *p;
2801 struct elf_dyn_relocs **head;
2803 /* We must copy these reloc types into the output file.
2804 Create a reloc section in dynobj and make room for
2808 sreloc = _bfd_elf_make_dynamic_reloc_section
2809 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2810 abfd, /*rela?*/ TRUE);
2816 /* If this is a global symbol, we count the number of
2817 relocations we need for this symbol. */
2819 head = &eh->dyn_relocs;
2822 /* Track dynamic relocs needed for local syms too.
2823 We really need local syms available to do this
2828 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2833 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2837 /* Beware of type punned pointers vs strict aliasing
2839 vpp = &(elf_section_data (s)->local_dynrel);
2840 head = (struct elf_dyn_relocs **)vpp;
2844 if (p == NULL || p->sec != sec)
2846 bfd_size_type amt = sizeof *p;
2848 p = ((struct elf_dyn_relocs *)
2849 bfd_alloc (htab->elf.dynobj, amt));
2860 /* Count size relocation as PC-relative relocation. */
2861 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2866 /* This relocation describes the C++ object vtable hierarchy.
2867 Reconstruct it for later use during GC. */
2868 case R_X86_64_GNU_VTINHERIT:
2869 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2873 /* This relocation describes which C++ vtable entries are actually
2874 used. Record for later use during GC. */
2875 case R_X86_64_GNU_VTENTRY:
2876 BFD_ASSERT (h != NULL);
2878 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2886 if ((r_type == R_X86_64_GOTPCREL
2887 || r_type == R_X86_64_GOTPCRELX
2888 || r_type == R_X86_64_REX_GOTPCRELX)
2889 && (h == NULL || h->type != STT_GNU_IFUNC))
2890 sec->need_convert_load = 1;
2893 if (elf_section_data (sec)->this_hdr.contents != contents)
2895 if (!info->keep_memory)
2899 /* Cache the section contents for elf_link_input_bfd. */
2900 elf_section_data (sec)->this_hdr.contents = contents;
2907 if (elf_section_data (sec)->this_hdr.contents != contents)
2909 sec->check_relocs_failed = 1;
2913 /* Return the section that should be marked against GC for a given
2917 elf_x86_64_gc_mark_hook (asection *sec,
2918 struct bfd_link_info *info,
2919 Elf_Internal_Rela *rel,
2920 struct elf_link_hash_entry *h,
2921 Elf_Internal_Sym *sym)
2924 switch (ELF32_R_TYPE (rel->r_info))
2926 case R_X86_64_GNU_VTINHERIT:
2927 case R_X86_64_GNU_VTENTRY:
2931 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2934 /* Remove undefined weak symbol from the dynamic symbol table if it
2935 is resolved to 0. */
2938 elf_x86_64_fixup_symbol (struct bfd_link_info *info,
2939 struct elf_link_hash_entry *h)
2941 if (h->dynindx != -1
2942 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2943 elf_x86_64_hash_entry (h)->has_got_reloc,
2944 elf_x86_64_hash_entry (h)))
2947 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2953 /* Adjust a symbol defined by a dynamic object and referenced by a
2954 regular object. The current definition is in some section of the
2955 dynamic object, but we're not including those sections. We have to
2956 change the definition to something the rest of the link can
2960 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2961 struct elf_link_hash_entry *h)
2963 struct elf_x86_64_link_hash_table *htab;
2965 struct elf_x86_64_link_hash_entry *eh;
2966 struct elf_dyn_relocs *p;
2968 /* STT_GNU_IFUNC symbol must go through PLT. */
2969 if (h->type == STT_GNU_IFUNC)
2971 /* All local STT_GNU_IFUNC references must be treate as local
2972 calls via local PLT. */
2974 && SYMBOL_CALLS_LOCAL (info, h))
2976 bfd_size_type pc_count = 0, count = 0;
2977 struct elf_dyn_relocs **pp;
2979 eh = (struct elf_x86_64_link_hash_entry *) h;
2980 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2982 pc_count += p->pc_count;
2983 p->count -= p->pc_count;
2992 if (pc_count || count)
2997 /* Increment PLT reference count only for PC-relative
3000 if (h->plt.refcount <= 0)
3001 h->plt.refcount = 1;
3003 h->plt.refcount += 1;
3008 if (h->plt.refcount <= 0)
3010 h->plt.offset = (bfd_vma) -1;
3016 /* If this is a function, put it in the procedure linkage table. We
3017 will fill in the contents of the procedure linkage table later,
3018 when we know the address of the .got section. */
3019 if (h->type == STT_FUNC
3022 if (h->plt.refcount <= 0
3023 || SYMBOL_CALLS_LOCAL (info, h)
3024 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
3025 && h->root.type == bfd_link_hash_undefweak))
3027 /* This case can occur if we saw a PLT32 reloc in an input
3028 file, but the symbol was never referred to by a dynamic
3029 object, or if all references were garbage collected. In
3030 such a case, we don't actually need to build a procedure
3031 linkage table, and we can just do a PC32 reloc instead. */
3032 h->plt.offset = (bfd_vma) -1;
3039 /* It's possible that we incorrectly decided a .plt reloc was
3040 needed for an R_X86_64_PC32 reloc to a non-function sym in
3041 check_relocs. We can't decide accurately between function and
3042 non-function syms in check-relocs; Objects loaded later in
3043 the link may change h->type. So fix it now. */
3044 h->plt.offset = (bfd_vma) -1;
3046 /* If this is a weak symbol, and there is a real definition, the
3047 processor independent code will have arranged for us to see the
3048 real definition first, and we can just use the same value. */
3049 if (h->u.weakdef != NULL)
3051 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
3052 || h->u.weakdef->root.type == bfd_link_hash_defweak);
3053 h->root.u.def.section = h->u.weakdef->root.u.def.section;
3054 h->root.u.def.value = h->u.weakdef->root.u.def.value;
3055 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
3057 eh = (struct elf_x86_64_link_hash_entry *) h;
3058 h->non_got_ref = h->u.weakdef->non_got_ref;
3059 eh->needs_copy = h->u.weakdef->needs_copy;
3064 /* This is a reference to a symbol defined by a dynamic object which
3065 is not a function. */
3067 /* If we are creating a shared library, we must presume that the
3068 only references to the symbol are via the global offset table.
3069 For such cases we need not do anything here; the relocations will
3070 be handled correctly by relocate_section. */
3071 if (!bfd_link_executable (info))
3074 /* If there are no references to this symbol that do not use the
3075 GOT, we don't need to generate a copy reloc. */
3076 if (!h->non_got_ref)
3079 /* If -z nocopyreloc was given, we won't generate them either. */
3080 if (info->nocopyreloc)
3086 if (ELIMINATE_COPY_RELOCS)
3088 eh = (struct elf_x86_64_link_hash_entry *) h;
3089 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3091 s = p->sec->output_section;
3092 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3096 /* If we didn't find any dynamic relocs in read-only sections, then
3097 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
3105 /* We must allocate the symbol in our .dynbss section, which will
3106 become part of the .bss section of the executable. There will be
3107 an entry for this symbol in the .dynsym section. The dynamic
3108 object will contain position independent code, so all references
3109 from the dynamic object to this symbol will go through the global
3110 offset table. The dynamic linker will use the .dynsym entry to
3111 determine the address it must put in the global offset table, so
3112 both the dynamic object and the regular object will refer to the
3113 same memory location for the variable. */
3115 htab = elf_x86_64_hash_table (info);
3119 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
3120 to copy the initial value out of the dynamic object and into the
3121 runtime process image. */
3122 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
3124 s = htab->elf.sdynrelro;
3125 srel = htab->elf.sreldynrelro;
3129 s = htab->elf.sdynbss;
3130 srel = htab->elf.srelbss;
3132 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
3134 const struct elf_backend_data *bed;
3135 bed = get_elf_backend_data (info->output_bfd);
3136 srel->size += bed->s->sizeof_rela;
3140 return _bfd_elf_adjust_dynamic_copy (info, h, s);
3143 /* Allocate space in .plt, .got and associated reloc sections for
3147 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
3149 struct bfd_link_info *info;
3150 struct elf_x86_64_link_hash_table *htab;
3151 struct elf_x86_64_link_hash_entry *eh;
3152 struct elf_dyn_relocs *p;
3153 const struct elf_backend_data *bed;
3154 unsigned int plt_entry_size;
3155 bfd_boolean resolved_to_zero;
3157 if (h->root.type == bfd_link_hash_indirect)
3160 eh = (struct elf_x86_64_link_hash_entry *) h;
3162 info = (struct bfd_link_info *) inf;
3163 htab = elf_x86_64_hash_table (info);
3166 bed = get_elf_backend_data (info->output_bfd);
3167 plt_entry_size = htab->plt.plt_entry_size;
3169 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
3173 /* We can't use the GOT PLT if pointer equality is needed since
3174 finish_dynamic_symbol won't clear symbol value and the dynamic
3175 linker won't update the GOT slot. We will get into an infinite
3176 loop at run-time. */
3177 if (htab->plt_got != NULL
3178 && h->type != STT_GNU_IFUNC
3179 && !h->pointer_equality_needed
3180 && h->plt.refcount > 0
3181 && h->got.refcount > 0)
3183 /* Don't use the regular PLT if there are both GOT and GOTPLT
3185 h->plt.offset = (bfd_vma) -1;
3187 /* Use the GOT PLT. */
3188 eh->plt_got.refcount = 1;
3191 /* Clear the reference count of function pointer relocations if
3192 symbol isn't a normal function. */
3193 if (h->type != STT_FUNC)
3194 eh->func_pointer_refcount = 0;
3196 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
3197 here if it is defined and referenced in a non-shared object. */
3198 if (h->type == STT_GNU_IFUNC
3201 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
3203 &htab->readonly_dynrelocs_against_ifunc,
3207 GOT_ENTRY_SIZE, TRUE))
3209 asection *s = htab->plt_second;
3210 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
3212 /* Use the second PLT section if it is created. */
3213 eh->plt_second.offset = s->size;
3215 /* Make room for this entry in the second PLT section. */
3216 s->size += htab->non_lazy_plt->plt_entry_size;
3224 /* Don't create the PLT entry if there are only function pointer
3225 relocations which can be resolved at run-time. */
3226 else if (htab->elf.dynamic_sections_created
3227 && (h->plt.refcount > eh->func_pointer_refcount
3228 || eh->plt_got.refcount > 0))
3230 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
3232 /* Clear the reference count of function pointer relocations
3234 eh->func_pointer_refcount = 0;
3236 /* Make sure this symbol is output as a dynamic symbol.
3237 Undefined weak syms won't yet be marked as dynamic. */
3238 if (h->dynindx == -1
3240 && !resolved_to_zero
3241 && h->root.type == bfd_link_hash_undefweak)
3243 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3247 if (bfd_link_pic (info)
3248 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
3250 asection *s = htab->elf.splt;
3251 asection *second_s = htab->plt_second;
3252 asection *got_s = htab->plt_got;
3254 /* If this is the first .plt entry, make room for the special
3255 first entry. The .plt section is used by prelink to undo
3256 prelinking for dynamic relocations. */
3258 s->size = htab->plt.has_plt0 * plt_entry_size;
3261 eh->plt_got.offset = got_s->size;
3264 h->plt.offset = s->size;
3266 eh->plt_second.offset = second_s->size;
3269 /* If this symbol is not defined in a regular file, and we are
3270 not generating a shared library, then set the symbol to this
3271 location in the .plt. This is required to make function
3272 pointers compare as equal between the normal executable and
3273 the shared library. */
3274 if (! bfd_link_pic (info)
3279 /* We need to make a call to the entry of the GOT PLT
3280 instead of regular PLT entry. */
3281 h->root.u.def.section = got_s;
3282 h->root.u.def.value = eh->plt_got.offset;
3288 /* We need to make a call to the entry of the
3289 second PLT instead of regular PLT entry. */
3290 h->root.u.def.section = second_s;
3291 h->root.u.def.value = eh->plt_second.offset;
3295 h->root.u.def.section = s;
3296 h->root.u.def.value = h->plt.offset;
3301 /* Make room for this entry. */
3303 got_s->size += htab->non_lazy_plt->plt_entry_size;
3306 s->size += plt_entry_size;
3308 second_s->size += htab->non_lazy_plt->plt_entry_size;
3310 /* We also need to make an entry in the .got.plt section,
3311 which will be placed in the .got section by the linker
3313 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
3315 /* There should be no PLT relocation against resolved
3316 undefined weak symbol in executable. */
3317 if (!resolved_to_zero)
3319 /* We also need to make an entry in the .rela.plt
3321 htab->elf.srelplt->size += bed->s->sizeof_rela;
3322 htab->elf.srelplt->reloc_count++;
3328 eh->plt_got.offset = (bfd_vma) -1;
3329 h->plt.offset = (bfd_vma) -1;
3335 eh->plt_got.offset = (bfd_vma) -1;
3336 h->plt.offset = (bfd_vma) -1;
3340 eh->tlsdesc_got = (bfd_vma) -1;
3342 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
3343 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
3344 if (h->got.refcount > 0
3345 && bfd_link_executable (info)
3347 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
3349 h->got.offset = (bfd_vma) -1;
3351 else if (h->got.refcount > 0)
3355 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
3357 /* Make sure this symbol is output as a dynamic symbol.
3358 Undefined weak syms won't yet be marked as dynamic. */
3359 if (h->dynindx == -1
3361 && !resolved_to_zero
3362 && h->root.type == bfd_link_hash_undefweak)
3364 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3368 if (GOT_TLS_GDESC_P (tls_type))
3370 eh->tlsdesc_got = htab->elf.sgotplt->size
3371 - elf_x86_64_compute_jump_table_size (htab);
3372 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3373 h->got.offset = (bfd_vma) -2;
3375 if (! GOT_TLS_GDESC_P (tls_type)
3376 || GOT_TLS_GD_P (tls_type))
3379 h->got.offset = s->size;
3380 s->size += GOT_ENTRY_SIZE;
3381 if (GOT_TLS_GD_P (tls_type))
3382 s->size += GOT_ENTRY_SIZE;
3384 dyn = htab->elf.dynamic_sections_created;
3385 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
3386 and two if global. R_X86_64_GOTTPOFF needs one dynamic
3387 relocation. No dynamic relocation against resolved undefined
3388 weak symbol in executable. */
3389 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
3390 || tls_type == GOT_TLS_IE)
3391 htab->elf.srelgot->size += bed->s->sizeof_rela;
3392 else if (GOT_TLS_GD_P (tls_type))
3393 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
3394 else if (! GOT_TLS_GDESC_P (tls_type)
3395 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3396 && !resolved_to_zero)
3397 || h->root.type != bfd_link_hash_undefweak)
3398 && (bfd_link_pic (info)
3399 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
3400 htab->elf.srelgot->size += bed->s->sizeof_rela;
3401 if (GOT_TLS_GDESC_P (tls_type))
3403 htab->elf.srelplt->size += bed->s->sizeof_rela;
3404 htab->tlsdesc_plt = (bfd_vma) -1;
3408 h->got.offset = (bfd_vma) -1;
3410 if (eh->dyn_relocs == NULL)
3413 /* In the shared -Bsymbolic case, discard space allocated for
3414 dynamic pc-relative relocs against symbols which turn out to be
3415 defined in regular objects. For the normal shared case, discard
3416 space for pc-relative relocs that have become local due to symbol
3417 visibility changes. */
3419 if (bfd_link_pic (info))
3421 /* Relocs that use pc_count are those that appear on a call
3422 insn, or certain REL relocs that can generated via assembly.
3423 We want calls to protected symbols to resolve directly to the
3424 function rather than going via the plt. If people want
3425 function pointer comparisons to work as expected then they
3426 should avoid writing weird assembly. */
3427 if (SYMBOL_CALLS_LOCAL (info, h))
3429 struct elf_dyn_relocs **pp;
3431 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3433 p->count -= p->pc_count;
3442 /* Also discard relocs on undefined weak syms with non-default
3443 visibility or in PIE. */
3444 if (eh->dyn_relocs != NULL)
3446 if (h->root.type == bfd_link_hash_undefweak)
3448 /* Undefined weak symbol is never bound locally in shared
3450 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
3451 || resolved_to_zero)
3452 eh->dyn_relocs = NULL;
3453 else if (h->dynindx == -1
3454 && ! h->forced_local
3455 && ! bfd_elf_link_record_dynamic_symbol (info, h))
3458 /* For PIE, discard space for pc-relative relocs against
3459 symbols which turn out to need copy relocs. */
3460 else if (bfd_link_executable (info)
3461 && (h->needs_copy || eh->needs_copy)
3465 struct elf_dyn_relocs **pp;
3467 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3469 if (p->pc_count != 0)
3477 else if (ELIMINATE_COPY_RELOCS)
3479 /* For the non-shared case, discard space for relocs against
3480 symbols which turn out to need copy relocs or are not
3481 dynamic. Keep dynamic relocations for run-time function
3482 pointer initialization. */
3484 if ((!h->non_got_ref
3485 || eh->func_pointer_refcount > 0
3486 || (h->root.type == bfd_link_hash_undefweak
3487 && !resolved_to_zero))
3490 || (htab->elf.dynamic_sections_created
3491 && (h->root.type == bfd_link_hash_undefweak
3492 || h->root.type == bfd_link_hash_undefined))))
3494 /* Make sure this symbol is output as a dynamic symbol.
3495 Undefined weak syms won't yet be marked as dynamic. */
3496 if (h->dynindx == -1
3497 && ! h->forced_local
3498 && ! resolved_to_zero
3499 && h->root.type == bfd_link_hash_undefweak
3500 && ! bfd_elf_link_record_dynamic_symbol (info, h))
3503 /* If that succeeded, we know we'll be keeping all the
3505 if (h->dynindx != -1)
3509 eh->dyn_relocs = NULL;
3510 eh->func_pointer_refcount = 0;
3515 /* Finally, allocate space. */
3516 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3520 sreloc = elf_section_data (p->sec)->sreloc;
3522 BFD_ASSERT (sreloc != NULL);
3524 sreloc->size += p->count * bed->s->sizeof_rela;
3530 /* Allocate space in .plt, .got and associated reloc sections for
3531 local dynamic relocs. */
3534 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
3536 struct elf_link_hash_entry *h
3537 = (struct elf_link_hash_entry *) *slot;
3539 if (h->type != STT_GNU_IFUNC
3543 || h->root.type != bfd_link_hash_defined)
3546 return elf_x86_64_allocate_dynrelocs (h, inf);
3549 /* Find any dynamic relocs that apply to read-only sections. */
3552 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
3555 struct elf_x86_64_link_hash_entry *eh;
3556 struct elf_dyn_relocs *p;
3558 /* Skip local IFUNC symbols. */
3559 if (h->forced_local && h->type == STT_GNU_IFUNC)
3562 eh = (struct elf_x86_64_link_hash_entry *) h;
3563 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3565 asection *s = p->sec->output_section;
3567 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3569 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3571 info->flags |= DF_TEXTREL;
3573 if ((info->warn_shared_textrel && bfd_link_pic (info))
3574 || info->error_textrel)
3575 /* xgettext:c-format */
3576 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3577 p->sec->owner, h->root.root.string,
3580 /* Not an error, just cut short the traversal. */
3587 /* Convert load via the GOT slot to load immediate. */
3590 elf_x86_64_convert_load (bfd *abfd, asection *sec,
3591 struct bfd_link_info *link_info)
3593 Elf_Internal_Shdr *symtab_hdr;
3594 Elf_Internal_Rela *internal_relocs;
3595 Elf_Internal_Rela *irel, *irelend;
3597 struct elf_x86_64_link_hash_table *htab;
3598 bfd_boolean changed;
3599 bfd_signed_vma *local_got_refcounts;
3601 /* Don't even try to convert non-ELF outputs. */
3602 if (!is_elf_hash_table (link_info->hash))
3605 /* Nothing to do if there is no need or no output. */
3606 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3607 || sec->need_convert_load == 0
3608 || bfd_is_abs_section (sec->output_section))
3611 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3613 /* Load the relocations for this section. */
3614 internal_relocs = (_bfd_elf_link_read_relocs
3615 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3616 link_info->keep_memory));
3617 if (internal_relocs == NULL)
3621 htab = elf_x86_64_hash_table (link_info);
3622 local_got_refcounts = elf_local_got_refcounts (abfd);
3624 /* Get the section contents. */
3625 if (elf_section_data (sec)->this_hdr.contents != NULL)
3626 contents = elf_section_data (sec)->this_hdr.contents;
3629 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3633 irelend = internal_relocs + sec->reloc_count;
3634 for (irel = internal_relocs; irel < irelend; irel++)
3636 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3637 unsigned int r_symndx;
3638 struct elf_link_hash_entry *h;
3639 bfd_boolean converted;
3641 if (r_type != R_X86_64_GOTPCRELX
3642 && r_type != R_X86_64_REX_GOTPCRELX
3643 && r_type != R_X86_64_GOTPCREL)
3646 r_symndx = htab->r_sym (irel->r_info);
3647 if (r_symndx < symtab_hdr->sh_info)
3648 h = elf_x86_64_get_local_sym_hash (htab, sec->owner,
3649 (const Elf_Internal_Rela *) irel,
3653 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3654 while (h->root.type == bfd_link_hash_indirect
3655 || h->root.type == bfd_link_hash_warning)
3656 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3659 /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
3660 if (h != NULL && h->type == STT_GNU_IFUNC)
3664 if (!elf_x86_64_convert_load_reloc (abfd, sec, contents, irel, h,
3665 &converted, link_info))
3670 changed = converted;
3673 if (h->got.refcount > 0)
3674 h->got.refcount -= 1;
3678 if (local_got_refcounts != NULL
3679 && local_got_refcounts[r_symndx] > 0)
3680 local_got_refcounts[r_symndx] -= 1;
3685 if (contents != NULL
3686 && elf_section_data (sec)->this_hdr.contents != contents)
3688 if (!changed && !link_info->keep_memory)
3692 /* Cache the section contents for elf_link_input_bfd. */
3693 elf_section_data (sec)->this_hdr.contents = contents;
3697 if (elf_section_data (sec)->relocs != internal_relocs)
3700 free (internal_relocs);
3702 elf_section_data (sec)->relocs = internal_relocs;
3708 if (contents != NULL
3709 && elf_section_data (sec)->this_hdr.contents != contents)
3711 if (internal_relocs != NULL
3712 && elf_section_data (sec)->relocs != internal_relocs)
3713 free (internal_relocs);
3717 /* Set the sizes of the dynamic sections. */
3720 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3721 struct bfd_link_info *info)
3723 struct elf_x86_64_link_hash_table *htab;
3728 const struct elf_backend_data *bed;
3730 htab = elf_x86_64_hash_table (info);
3733 bed = get_elf_backend_data (output_bfd);
3735 dynobj = htab->elf.dynobj;
3739 /* Set up .got offsets for local syms, and space for local dynamic
3741 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3743 bfd_signed_vma *local_got;
3744 bfd_signed_vma *end_local_got;
3745 char *local_tls_type;
3746 bfd_vma *local_tlsdesc_gotent;
3747 bfd_size_type locsymcount;
3748 Elf_Internal_Shdr *symtab_hdr;
3751 if (! is_x86_64_elf (ibfd))
3754 for (s = ibfd->sections; s != NULL; s = s->next)
3756 struct elf_dyn_relocs *p;
3758 if (!elf_x86_64_convert_load (ibfd, s, info))
3761 for (p = (struct elf_dyn_relocs *)
3762 (elf_section_data (s)->local_dynrel);
3766 if (!bfd_is_abs_section (p->sec)
3767 && bfd_is_abs_section (p->sec->output_section))
3769 /* Input section has been discarded, either because
3770 it is a copy of a linkonce section or due to
3771 linker script /DISCARD/, so we'll be discarding
3774 else if (p->count != 0)
3776 srel = elf_section_data (p->sec)->sreloc;
3777 srel->size += p->count * bed->s->sizeof_rela;
3778 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3779 && (info->flags & DF_TEXTREL) == 0)
3781 info->flags |= DF_TEXTREL;
3782 if ((info->warn_shared_textrel && bfd_link_pic (info))
3783 || info->error_textrel)
3784 /* xgettext:c-format */
3785 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3786 p->sec->owner, p->sec);
3792 local_got = elf_local_got_refcounts (ibfd);
3796 symtab_hdr = &elf_symtab_hdr (ibfd);
3797 locsymcount = symtab_hdr->sh_info;
3798 end_local_got = local_got + locsymcount;
3799 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3800 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3802 srel = htab->elf.srelgot;
3803 for (; local_got < end_local_got;
3804 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3806 *local_tlsdesc_gotent = (bfd_vma) -1;
3809 if (GOT_TLS_GDESC_P (*local_tls_type))
3811 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3812 - elf_x86_64_compute_jump_table_size (htab);
3813 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3814 *local_got = (bfd_vma) -2;
3816 if (! GOT_TLS_GDESC_P (*local_tls_type)
3817 || GOT_TLS_GD_P (*local_tls_type))
3819 *local_got = s->size;
3820 s->size += GOT_ENTRY_SIZE;
3821 if (GOT_TLS_GD_P (*local_tls_type))
3822 s->size += GOT_ENTRY_SIZE;
3824 if (bfd_link_pic (info)
3825 || GOT_TLS_GD_ANY_P (*local_tls_type)
3826 || *local_tls_type == GOT_TLS_IE)
3828 if (GOT_TLS_GDESC_P (*local_tls_type))
3830 htab->elf.srelplt->size
3831 += bed->s->sizeof_rela;
3832 htab->tlsdesc_plt = (bfd_vma) -1;
3834 if (! GOT_TLS_GDESC_P (*local_tls_type)
3835 || GOT_TLS_GD_P (*local_tls_type))
3836 srel->size += bed->s->sizeof_rela;
3840 *local_got = (bfd_vma) -1;
3844 if (htab->tls_ld_got.refcount > 0)
3846 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3848 htab->tls_ld_got.offset = htab->elf.sgot->size;
3849 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3850 htab->elf.srelgot->size += bed->s->sizeof_rela;
3853 htab->tls_ld_got.offset = -1;
3855 /* Allocate global sym .plt and .got entries, and space for global
3856 sym dynamic relocs. */
3857 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3860 /* Allocate .plt and .got entries, and space for local symbols. */
3861 htab_traverse (htab->loc_hash_table,
3862 elf_x86_64_allocate_local_dynrelocs,
3865 /* For every jump slot reserved in the sgotplt, reloc_count is
3866 incremented. However, when we reserve space for TLS descriptors,
3867 it's not incremented, so in order to compute the space reserved
3868 for them, it suffices to multiply the reloc count by the jump
3871 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3872 so that R_X86_64_IRELATIVE entries come last. */
3873 if (htab->elf.srelplt)
3875 htab->sgotplt_jump_table_size
3876 = elf_x86_64_compute_jump_table_size (htab);
3877 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3879 else if (htab->elf.irelplt)
3880 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3882 if (htab->tlsdesc_plt)
3884 /* If we're not using lazy TLS relocations, don't generate the
3885 PLT and GOT entries they require. */
3886 if ((info->flags & DF_BIND_NOW))
3887 htab->tlsdesc_plt = 0;
3890 htab->tlsdesc_got = htab->elf.sgot->size;
3891 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3892 /* Reserve room for the initial entry.
3893 FIXME: we could probably do away with it in this case. */
3894 if (htab->elf.splt->size == 0)
3895 htab->elf.splt->size = htab->plt.plt_entry_size;
3896 htab->tlsdesc_plt = htab->elf.splt->size;
3897 htab->elf.splt->size += htab->plt.plt_entry_size;
3901 if (htab->elf.sgotplt)
3903 /* Don't allocate .got.plt section if there are no GOT nor PLT
3904 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3905 if ((htab->elf.hgot == NULL
3906 || !htab->elf.hgot->ref_regular_nonweak)
3907 && (htab->elf.sgotplt->size
3908 == get_elf_backend_data (output_bfd)->got_header_size)
3909 && (htab->elf.splt == NULL
3910 || htab->elf.splt->size == 0)
3911 && (htab->elf.sgot == NULL
3912 || htab->elf.sgot->size == 0)
3913 && (htab->elf.iplt == NULL
3914 || htab->elf.iplt->size == 0)
3915 && (htab->elf.igotplt == NULL
3916 || htab->elf.igotplt->size == 0))
3917 htab->elf.sgotplt->size = 0;
3920 if (_bfd_elf_eh_frame_present (info))
3922 if (htab->plt_eh_frame != NULL
3923 && htab->elf.splt != NULL
3924 && htab->elf.splt->size != 0
3925 && !bfd_is_abs_section (htab->elf.splt->output_section))
3926 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
3928 if (htab->plt_got_eh_frame != NULL
3929 && htab->plt_got != NULL
3930 && htab->plt_got->size != 0
3931 && !bfd_is_abs_section (htab->plt_got->output_section))
3932 htab->plt_got_eh_frame->size
3933 = htab->non_lazy_plt->eh_frame_plt_size;
3935 /* Unwind info for the second PLT and .plt.got sections are
3937 if (htab->plt_second_eh_frame != NULL
3938 && htab->plt_second != NULL
3939 && htab->plt_second->size != 0
3940 && !bfd_is_abs_section (htab->plt_second->output_section))
3941 htab->plt_second_eh_frame->size
3942 = htab->non_lazy_plt->eh_frame_plt_size;
3945 /* We now have determined the sizes of the various dynamic sections.
3946 Allocate memory for them. */
3948 for (s = dynobj->sections; s != NULL; s = s->next)
3950 if ((s->flags & SEC_LINKER_CREATED) == 0)
3953 if (s == htab->elf.splt
3954 || s == htab->elf.sgot
3955 || s == htab->elf.sgotplt
3956 || s == htab->elf.iplt
3957 || s == htab->elf.igotplt
3958 || s == htab->plt_second
3959 || s == htab->plt_got
3960 || s == htab->plt_eh_frame
3961 || s == htab->plt_got_eh_frame
3962 || s == htab->plt_second_eh_frame
3963 || s == htab->elf.sdynbss
3964 || s == htab->elf.sdynrelro)
3966 /* Strip this section if we don't need it; see the
3969 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3971 if (s->size != 0 && s != htab->elf.srelplt)
3974 /* We use the reloc_count field as a counter if we need
3975 to copy relocs into the output file. */
3976 if (s != htab->elf.srelplt)
3981 /* It's not one of our sections, so don't allocate space. */
3987 /* If we don't need this section, strip it from the
3988 output file. This is mostly to handle .rela.bss and
3989 .rela.plt. We must create both sections in
3990 create_dynamic_sections, because they must be created
3991 before the linker maps input sections to output
3992 sections. The linker does that before
3993 adjust_dynamic_symbol is called, and it is that
3994 function which decides whether anything needs to go
3995 into these sections. */
3997 s->flags |= SEC_EXCLUDE;
4001 if ((s->flags & SEC_HAS_CONTENTS) == 0)
4004 /* Allocate memory for the section contents. We use bfd_zalloc
4005 here in case unused entries are not reclaimed before the
4006 section's contents are written out. This should not happen,
4007 but this way if it does, we get a R_X86_64_NONE reloc instead
4009 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
4010 if (s->contents == NULL)
4014 if (htab->plt_eh_frame != NULL
4015 && htab->plt_eh_frame->contents != NULL)
4017 memcpy (htab->plt_eh_frame->contents,
4018 htab->plt.eh_frame_plt, htab->plt_eh_frame->size);
4019 bfd_put_32 (dynobj, htab->elf.splt->size,
4020 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
4023 if (htab->plt_got_eh_frame != NULL
4024 && htab->plt_got_eh_frame->contents != NULL)
4026 memcpy (htab->plt_got_eh_frame->contents,
4027 htab->non_lazy_plt->eh_frame_plt,
4028 htab->plt_got_eh_frame->size);
4029 bfd_put_32 (dynobj, htab->plt_got->size,
4030 (htab->plt_got_eh_frame->contents
4031 + PLT_FDE_LEN_OFFSET));
4034 if (htab->plt_second_eh_frame != NULL
4035 && htab->plt_second_eh_frame->contents != NULL)
4037 memcpy (htab->plt_second_eh_frame->contents,
4038 htab->non_lazy_plt->eh_frame_plt,
4039 htab->plt_second_eh_frame->size);
4040 bfd_put_32 (dynobj, htab->plt_second->size,
4041 (htab->plt_second_eh_frame->contents
4042 + PLT_FDE_LEN_OFFSET));
4045 if (htab->elf.dynamic_sections_created)
4047 /* Add some entries to the .dynamic section. We fill in the
4048 values later, in elf_x86_64_finish_dynamic_sections, but we
4049 must add the entries now so that we get the correct size for
4050 the .dynamic section. The DT_DEBUG entry is filled in by the
4051 dynamic linker and used by the debugger. */
4052 #define add_dynamic_entry(TAG, VAL) \
4053 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4055 if (bfd_link_executable (info))
4057 if (!add_dynamic_entry (DT_DEBUG, 0))
4061 if (htab->elf.splt->size != 0)
4063 /* DT_PLTGOT is used by prelink even if there is no PLT
4065 if (!add_dynamic_entry (DT_PLTGOT, 0))
4069 if (htab->elf.srelplt->size != 0)
4071 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
4072 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
4073 || !add_dynamic_entry (DT_JMPREL, 0))
4077 if (htab->tlsdesc_plt
4078 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
4079 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
4084 if (!add_dynamic_entry (DT_RELA, 0)
4085 || !add_dynamic_entry (DT_RELASZ, 0)
4086 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
4089 /* If any dynamic relocs apply to a read-only section,
4090 then we need a DT_TEXTREL entry. */
4091 if ((info->flags & DF_TEXTREL) == 0)
4092 elf_link_hash_traverse (&htab->elf,
4093 elf_x86_64_readonly_dynrelocs,
4096 if ((info->flags & DF_TEXTREL) != 0)
4098 if (htab->readonly_dynrelocs_against_ifunc)
4100 info->callbacks->einfo
4101 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
4102 bfd_set_error (bfd_error_bad_value);
4106 if (!add_dynamic_entry (DT_TEXTREL, 0))
4111 #undef add_dynamic_entry
4117 elf_x86_64_always_size_sections (bfd *output_bfd,
4118 struct bfd_link_info *info)
4120 asection *tls_sec = elf_hash_table (info)->tls_sec;
4124 struct elf_link_hash_entry *tlsbase;
4126 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
4127 "_TLS_MODULE_BASE_",
4128 FALSE, FALSE, FALSE);
4130 if (tlsbase && tlsbase->type == STT_TLS)
4132 struct elf_x86_64_link_hash_table *htab;
4133 struct bfd_link_hash_entry *bh = NULL;
4134 const struct elf_backend_data *bed
4135 = get_elf_backend_data (output_bfd);
4137 htab = elf_x86_64_hash_table (info);
4141 if (!(_bfd_generic_link_add_one_symbol
4142 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
4143 tls_sec, 0, NULL, FALSE,
4144 bed->collect, &bh)))
4147 htab->tls_module_base = bh;
4149 tlsbase = (struct elf_link_hash_entry *)bh;
4150 tlsbase->def_regular = 1;
4151 tlsbase->other = STV_HIDDEN;
4152 tlsbase->root.linker_def = 1;
4153 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
4160 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
4161 executables. Rather than setting it to the beginning of the TLS
4162 section, we have to set it to the end. This function may be called
4163 multiple times, it is idempotent. */
4166 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
4168 struct elf_x86_64_link_hash_table *htab;
4169 struct bfd_link_hash_entry *base;
4171 if (!bfd_link_executable (info))
4174 htab = elf_x86_64_hash_table (info);
4178 base = htab->tls_module_base;
4182 base->u.def.value = htab->elf.tls_size;
4185 /* Return the base VMA address which should be subtracted from real addresses
4186 when resolving @dtpoff relocation.
4187 This is PT_TLS segment p_vaddr. */
4190 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
4192 /* If tls_sec is NULL, we should have signalled an error already. */
4193 if (elf_hash_table (info)->tls_sec == NULL)
4195 return elf_hash_table (info)->tls_sec->vma;
4198 /* Return the relocation value for @tpoff relocation
4199 if STT_TLS virtual address is ADDRESS. */
4202 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
4204 struct elf_link_hash_table *htab = elf_hash_table (info);
4205 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
4206 bfd_vma static_tls_size;
4208 /* If tls_segment is NULL, we should have signalled an error already. */
4209 if (htab->tls_sec == NULL)
4212 /* Consider special static TLS alignment requirements. */
4213 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
4214 return address - static_tls_size - htab->tls_sec->vma;
4217 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
4221 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
4223 /* Opcode Instruction
4226 0x0f 0x8x conditional jump */
4228 && (contents [offset - 1] == 0xe8
4229 || contents [offset - 1] == 0xe9))
4231 && contents [offset - 2] == 0x0f
4232 && (contents [offset - 1] & 0xf0) == 0x80));
4235 /* Relocate an x86_64 ELF section. */
4238 elf_x86_64_relocate_section (bfd *output_bfd,
4239 struct bfd_link_info *info,
4241 asection *input_section,
4243 Elf_Internal_Rela *relocs,
4244 Elf_Internal_Sym *local_syms,
4245 asection **local_sections)
4247 struct elf_x86_64_link_hash_table *htab;
4248 Elf_Internal_Shdr *symtab_hdr;
4249 struct elf_link_hash_entry **sym_hashes;
4250 bfd_vma *local_got_offsets;
4251 bfd_vma *local_tlsdesc_gotents;
4252 Elf_Internal_Rela *rel;
4253 Elf_Internal_Rela *wrel;
4254 Elf_Internal_Rela *relend;
4255 unsigned int plt_entry_size;
4257 BFD_ASSERT (is_x86_64_elf (input_bfd));
4259 /* Skip if check_relocs failed. */
4260 if (input_section->check_relocs_failed)
4263 htab = elf_x86_64_hash_table (info);
4266 plt_entry_size = htab->plt.plt_entry_size;
4267 symtab_hdr = &elf_symtab_hdr (input_bfd);
4268 sym_hashes = elf_sym_hashes (input_bfd);
4269 local_got_offsets = elf_local_got_offsets (input_bfd);
4270 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
4272 elf_x86_64_set_tls_module_base (info);
4274 rel = wrel = relocs;
4275 relend = relocs + input_section->reloc_count;
4276 for (; rel < relend; wrel++, rel++)
4278 unsigned int r_type;
4279 reloc_howto_type *howto;
4280 unsigned long r_symndx;
4281 struct elf_link_hash_entry *h;
4282 struct elf_x86_64_link_hash_entry *eh;
4283 Elf_Internal_Sym *sym;
4285 bfd_vma off, offplt, plt_offset;
4287 bfd_boolean unresolved_reloc;
4288 bfd_reloc_status_type r;
4290 asection *base_got, *resolved_plt;
4292 bfd_boolean resolved_to_zero;
4293 bfd_boolean relative_reloc;
4295 r_type = ELF32_R_TYPE (rel->r_info);
4296 if (r_type == (int) R_X86_64_GNU_VTINHERIT
4297 || r_type == (int) R_X86_64_GNU_VTENTRY)
4304 if (r_type >= (int) R_X86_64_standard)
4305 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
4307 if (r_type != (int) R_X86_64_32
4308 || ABI_64_P (output_bfd))
4309 howto = x86_64_elf_howto_table + r_type;
4311 howto = (x86_64_elf_howto_table
4312 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
4313 r_symndx = htab->r_sym (rel->r_info);
4317 unresolved_reloc = FALSE;
4318 if (r_symndx < symtab_hdr->sh_info)
4320 sym = local_syms + r_symndx;
4321 sec = local_sections[r_symndx];
4323 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
4325 st_size = sym->st_size;
4327 /* Relocate against local STT_GNU_IFUNC symbol. */
4328 if (!bfd_link_relocatable (info)
4329 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4331 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
4336 /* Set STT_GNU_IFUNC symbol value. */
4337 h->root.u.def.value = sym->st_value;
4338 h->root.u.def.section = sec;
4343 bfd_boolean warned ATTRIBUTE_UNUSED;
4344 bfd_boolean ignored ATTRIBUTE_UNUSED;
4346 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
4347 r_symndx, symtab_hdr, sym_hashes,
4349 unresolved_reloc, warned, ignored);
4353 if (sec != NULL && discarded_section (sec))
4355 _bfd_clear_contents (howto, input_bfd, input_section,
4356 contents + rel->r_offset);
4357 wrel->r_offset = rel->r_offset;
4361 /* For ld -r, remove relocations in debug sections against
4362 sections defined in discarded sections. Not done for
4363 eh_frame editing code expects to be present. */
4364 if (bfd_link_relocatable (info)
4365 && (input_section->flags & SEC_DEBUGGING))
4371 if (bfd_link_relocatable (info))
4378 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
4380 if (r_type == R_X86_64_64)
4382 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4383 zero-extend it to 64bit if addend is zero. */
4384 r_type = R_X86_64_32;
4385 memset (contents + rel->r_offset + 4, 0, 4);
4387 else if (r_type == R_X86_64_SIZE64)
4389 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4390 zero-extend it to 64bit if addend is zero. */
4391 r_type = R_X86_64_SIZE32;
4392 memset (contents + rel->r_offset + 4, 0, 4);
4396 eh = (struct elf_x86_64_link_hash_entry *) h;
4398 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4399 it here if it is defined in a non-shared object. */
4401 && h->type == STT_GNU_IFUNC
4407 if ((input_section->flags & SEC_ALLOC) == 0)
4409 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4410 sections because such sections are not SEC_ALLOC and
4411 thus ld.so will not process them. */
4412 if ((input_section->flags & SEC_DEBUGGING) != 0)
4422 case R_X86_64_GOTPCREL:
4423 case R_X86_64_GOTPCRELX:
4424 case R_X86_64_REX_GOTPCRELX:
4425 case R_X86_64_GOTPCREL64:
4426 base_got = htab->elf.sgot;
4427 off = h->got.offset;
4429 if (base_got == NULL)
4432 if (off == (bfd_vma) -1)
4434 /* We can't use h->got.offset here to save state, or
4435 even just remember the offset, as finish_dynamic_symbol
4436 would use that as offset into .got. */
4438 if (h->plt.offset == (bfd_vma) -1)
4441 if (htab->elf.splt != NULL)
4443 plt_index = (h->plt.offset / plt_entry_size
4444 - htab->plt.has_plt0);
4445 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4446 base_got = htab->elf.sgotplt;
4450 plt_index = h->plt.offset / plt_entry_size;
4451 off = plt_index * GOT_ENTRY_SIZE;
4452 base_got = htab->elf.igotplt;
4455 if (h->dynindx == -1
4459 /* This references the local defitionion. We must
4460 initialize this entry in the global offset table.
4461 Since the offset must always be a multiple of 8,
4462 we use the least significant bit to record
4463 whether we have initialized it already.
4465 When doing a dynamic link, we create a .rela.got
4466 relocation entry to initialize the value. This
4467 is done in the finish_dynamic_symbol routine. */
4472 bfd_put_64 (output_bfd, relocation,
4473 base_got->contents + off);
4474 /* Note that this is harmless for the GOTPLT64
4475 case, as -1 | 1 still is -1. */
4481 relocation = (base_got->output_section->vma
4482 + base_got->output_offset + off);
4487 if (h->plt.offset == (bfd_vma) -1)
4489 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4490 if (r_type == htab->pointer_r_type
4491 && (input_section->flags & SEC_CODE) == 0)
4492 goto do_ifunc_pointer;
4493 goto bad_ifunc_reloc;
4496 /* STT_GNU_IFUNC symbol must go through PLT. */
4497 if (htab->elf.splt != NULL)
4499 if (htab->plt_second != NULL)
4501 resolved_plt = htab->plt_second;
4502 plt_offset = eh->plt_second.offset;
4506 resolved_plt = htab->elf.splt;
4507 plt_offset = h->plt.offset;
4512 resolved_plt = htab->elf.iplt;
4513 plt_offset = h->plt.offset;
4516 relocation = (resolved_plt->output_section->vma
4517 + resolved_plt->output_offset + plt_offset);
4523 if (h->root.root.string)
4524 name = h->root.root.string;
4526 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4529 /* xgettext:c-format */
4530 (_("%B: relocation %s against STT_GNU_IFUNC "
4531 "symbol `%s' isn't supported"), input_bfd,
4533 bfd_set_error (bfd_error_bad_value);
4537 if (bfd_link_pic (info))
4542 if (ABI_64_P (output_bfd))
4547 if (rel->r_addend != 0)
4549 if (h->root.root.string)
4550 name = h->root.root.string;
4552 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4555 /* xgettext:c-format */
4556 (_("%B: relocation %s against STT_GNU_IFUNC "
4557 "symbol `%s' has non-zero addend: %Ld"),
4558 input_bfd, howto->name, name, rel->r_addend);
4559 bfd_set_error (bfd_error_bad_value);
4563 /* Generate dynamic relcoation only when there is a
4564 non-GOT reference in a shared object or there is no
4566 if ((bfd_link_pic (info) && h->non_got_ref)
4567 || h->plt.offset == (bfd_vma) -1)
4569 Elf_Internal_Rela outrel;
4572 /* Need a dynamic relocation to get the real function
4574 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
4578 if (outrel.r_offset == (bfd_vma) -1
4579 || outrel.r_offset == (bfd_vma) -2)
4582 outrel.r_offset += (input_section->output_section->vma
4583 + input_section->output_offset);
4585 if (h->dynindx == -1
4587 || bfd_link_executable (info))
4589 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
4590 h->root.root.string,
4591 h->root.u.def.section->owner);
4593 /* This symbol is resolved locally. */
4594 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4595 outrel.r_addend = (h->root.u.def.value
4596 + h->root.u.def.section->output_section->vma
4597 + h->root.u.def.section->output_offset);
4601 outrel.r_info = htab->r_info (h->dynindx, r_type);
4602 outrel.r_addend = 0;
4605 /* Dynamic relocations are stored in
4606 1. .rela.ifunc section in PIC object.
4607 2. .rela.got section in dynamic executable.
4608 3. .rela.iplt section in static executable. */
4609 if (bfd_link_pic (info))
4610 sreloc = htab->elf.irelifunc;
4611 else if (htab->elf.splt != NULL)
4612 sreloc = htab->elf.srelgot;
4614 sreloc = htab->elf.irelplt;
4615 elf_append_rela (output_bfd, sreloc, &outrel);
4617 /* If this reloc is against an external symbol, we
4618 do not want to fiddle with the addend. Otherwise,
4619 we need to include the symbol value so that it
4620 becomes an addend for the dynamic reloc. For an
4621 internal symbol, we have updated addend. */
4626 case R_X86_64_PC32_BND:
4628 case R_X86_64_PLT32:
4629 case R_X86_64_PLT32_BND:
4634 resolved_to_zero = (eh != NULL
4635 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4639 /* When generating a shared object, the relocations handled here are
4640 copied into the output file to be resolved at run time. */
4643 case R_X86_64_GOT32:
4644 case R_X86_64_GOT64:
4645 /* Relocation is to the entry for this symbol in the global
4647 case R_X86_64_GOTPCREL:
4648 case R_X86_64_GOTPCRELX:
4649 case R_X86_64_REX_GOTPCRELX:
4650 case R_X86_64_GOTPCREL64:
4651 /* Use global offset table entry as symbol value. */
4652 case R_X86_64_GOTPLT64:
4653 /* This is obsolete and treated the same as GOT64. */
4654 base_got = htab->elf.sgot;
4656 if (htab->elf.sgot == NULL)
4659 relative_reloc = FALSE;
4664 off = h->got.offset;
4666 && h->plt.offset != (bfd_vma)-1
4667 && off == (bfd_vma)-1)
4669 /* We can't use h->got.offset here to save
4670 state, or even just remember the offset, as
4671 finish_dynamic_symbol would use that as offset into
4673 bfd_vma plt_index = (h->plt.offset / plt_entry_size
4674 - htab->plt.has_plt0);
4675 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4676 base_got = htab->elf.sgotplt;
4679 dyn = htab->elf.dynamic_sections_created;
4681 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
4682 || (bfd_link_pic (info)
4683 && SYMBOL_REFERENCES_LOCAL (info, h))
4684 || (ELF_ST_VISIBILITY (h->other)
4685 && h->root.type == bfd_link_hash_undefweak))
4687 /* This is actually a static link, or it is a -Bsymbolic
4688 link and the symbol is defined locally, or the symbol
4689 was forced to be local because of a version file. We
4690 must initialize this entry in the global offset table.
4691 Since the offset must always be a multiple of 8, we
4692 use the least significant bit to record whether we
4693 have initialized it already.
4695 When doing a dynamic link, we create a .rela.got
4696 relocation entry to initialize the value. This is
4697 done in the finish_dynamic_symbol routine. */
4702 bfd_put_64 (output_bfd, relocation,
4703 base_got->contents + off);
4704 /* Note that this is harmless for the GOTPLT64 case,
4705 as -1 | 1 still is -1. */
4708 if (h->dynindx == -1
4710 && h->root.type != bfd_link_hash_undefweak
4711 && bfd_link_pic (info))
4713 /* If this symbol isn't dynamic in PIC,
4714 generate R_X86_64_RELATIVE here. */
4715 eh->no_finish_dynamic_symbol = 1;
4716 relative_reloc = TRUE;
4721 unresolved_reloc = FALSE;
4725 if (local_got_offsets == NULL)
4728 off = local_got_offsets[r_symndx];
4730 /* The offset must always be a multiple of 8. We use
4731 the least significant bit to record whether we have
4732 already generated the necessary reloc. */
4737 bfd_put_64 (output_bfd, relocation,
4738 base_got->contents + off);
4739 local_got_offsets[r_symndx] |= 1;
4741 if (bfd_link_pic (info))
4742 relative_reloc = TRUE;
4749 Elf_Internal_Rela outrel;
4751 /* We need to generate a R_X86_64_RELATIVE reloc
4752 for the dynamic linker. */
4753 s = htab->elf.srelgot;
4757 outrel.r_offset = (base_got->output_section->vma
4758 + base_got->output_offset
4760 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4761 outrel.r_addend = relocation;
4762 elf_append_rela (output_bfd, s, &outrel);
4765 if (off >= (bfd_vma) -2)
4768 relocation = base_got->output_section->vma
4769 + base_got->output_offset + off;
4770 if (r_type != R_X86_64_GOTPCREL
4771 && r_type != R_X86_64_GOTPCRELX
4772 && r_type != R_X86_64_REX_GOTPCRELX
4773 && r_type != R_X86_64_GOTPCREL64)
4774 relocation -= htab->elf.sgotplt->output_section->vma
4775 - htab->elf.sgotplt->output_offset;
4779 case R_X86_64_GOTOFF64:
4780 /* Relocation is relative to the start of the global offset
4783 /* Check to make sure it isn't a protected function or data
4784 symbol for shared library since it may not be local when
4785 used as function address or with copy relocation. We also
4786 need to make sure that a symbol is referenced locally. */
4787 if (bfd_link_pic (info) && h)
4789 if (!h->def_regular)
4793 switch (ELF_ST_VISIBILITY (h->other))
4796 v = _("hidden symbol");
4799 v = _("internal symbol");
4802 v = _("protected symbol");
4810 /* xgettext:c-format */
4811 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s"
4812 " `%s' can not be used when making a shared object"),
4813 input_bfd, v, h->root.root.string);
4814 bfd_set_error (bfd_error_bad_value);
4817 else if (!bfd_link_executable (info)
4818 && !SYMBOL_REFERENCES_LOCAL (info, h)
4819 && (h->type == STT_FUNC
4820 || h->type == STT_OBJECT)
4821 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4824 /* xgettext:c-format */
4825 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s"
4826 " `%s' can not be used when making a shared object"),
4828 h->type == STT_FUNC ? "function" : "data",
4829 h->root.root.string);
4830 bfd_set_error (bfd_error_bad_value);
4835 /* Note that sgot is not involved in this
4836 calculation. We always want the start of .got.plt. If we
4837 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4838 permitted by the ABI, we might have to change this
4840 relocation -= htab->elf.sgotplt->output_section->vma
4841 + htab->elf.sgotplt->output_offset;
4844 case R_X86_64_GOTPC32:
4845 case R_X86_64_GOTPC64:
4846 /* Use global offset table as symbol value. */
4847 relocation = htab->elf.sgotplt->output_section->vma
4848 + htab->elf.sgotplt->output_offset;
4849 unresolved_reloc = FALSE;
4852 case R_X86_64_PLTOFF64:
4853 /* Relocation is PLT entry relative to GOT. For local
4854 symbols it's the symbol itself relative to GOT. */
4856 /* See PLT32 handling. */
4857 && (h->plt.offset != (bfd_vma) -1
4858 || eh->plt_got.offset != (bfd_vma) -1)
4859 && htab->elf.splt != NULL)
4861 if (eh->plt_got.offset != (bfd_vma) -1)
4863 /* Use the GOT PLT. */
4864 resolved_plt = htab->plt_got;
4865 plt_offset = eh->plt_got.offset;
4867 else if (htab->plt_second != NULL)
4869 resolved_plt = htab->plt_second;
4870 plt_offset = eh->plt_second.offset;
4874 resolved_plt = htab->elf.splt;
4875 plt_offset = h->plt.offset;
4878 relocation = (resolved_plt->output_section->vma
4879 + resolved_plt->output_offset
4881 unresolved_reloc = FALSE;
4884 relocation -= htab->elf.sgotplt->output_section->vma
4885 + htab->elf.sgotplt->output_offset;
4888 case R_X86_64_PLT32:
4889 case R_X86_64_PLT32_BND:
4890 /* Relocation is to the entry for this symbol in the
4891 procedure linkage table. */
4893 /* Resolve a PLT32 reloc against a local symbol directly,
4894 without using the procedure linkage table. */
4898 if ((h->plt.offset == (bfd_vma) -1
4899 && eh->plt_got.offset == (bfd_vma) -1)
4900 || htab->elf.splt == NULL)
4902 /* We didn't make a PLT entry for this symbol. This
4903 happens when statically linking PIC code, or when
4904 using -Bsymbolic. */
4908 if (h->plt.offset != (bfd_vma) -1)
4910 if (htab->plt_second != NULL)
4912 resolved_plt = htab->plt_second;
4913 plt_offset = eh->plt_second.offset;
4917 resolved_plt = htab->elf.splt;
4918 plt_offset = h->plt.offset;
4923 /* Use the GOT PLT. */
4924 resolved_plt = htab->plt_got;
4925 plt_offset = eh->plt_got.offset;
4928 relocation = (resolved_plt->output_section->vma
4929 + resolved_plt->output_offset
4931 unresolved_reloc = FALSE;
4934 case R_X86_64_SIZE32:
4935 case R_X86_64_SIZE64:
4936 /* Set to symbol size. */
4937 relocation = st_size;
4943 case R_X86_64_PC32_BND:
4944 /* Don't complain about -fPIC if the symbol is undefined when
4945 building executable unless it is unresolved weak symbol. */
4946 if ((input_section->flags & SEC_ALLOC) != 0
4947 && (input_section->flags & SEC_READONLY) != 0
4949 && ((bfd_link_executable (info)
4950 && h->root.type == bfd_link_hash_undefweak
4951 && !resolved_to_zero)
4952 || bfd_link_dll (info)))
4954 bfd_boolean fail = FALSE;
4956 = ((r_type == R_X86_64_PC32
4957 || r_type == R_X86_64_PC32_BND)
4958 && is_32bit_relative_branch (contents, rel->r_offset));
4960 if (SYMBOL_REFERENCES_LOCAL (info, h))
4962 /* Symbol is referenced locally. Make sure it is
4963 defined locally or for a branch. */
4964 fail = (!(h->def_regular || ELF_COMMON_DEF_P (h))
4967 else if (!(bfd_link_pie (info)
4968 && (h->needs_copy || eh->needs_copy)))
4970 /* Symbol doesn't need copy reloc and isn't referenced
4971 locally. We only allow branch to symbol with
4972 non-default visibility. */
4974 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4978 return elf_x86_64_need_pic (info, input_bfd, input_section,
4979 h, NULL, NULL, howto);
4988 /* FIXME: The ABI says the linker should make sure the value is
4989 the same when it's zeroextended to 64 bit. */
4992 if ((input_section->flags & SEC_ALLOC) == 0)
4995 /* Don't copy a pc-relative relocation into the output file
4996 if the symbol needs copy reloc or the symbol is undefined
4997 when building executable. Copy dynamic function pointer
4998 relocations. Don't generate dynamic relocations against
4999 resolved undefined weak symbols in PIE. */
5000 if ((bfd_link_pic (info)
5001 && !(bfd_link_pie (info)
5005 || h->root.type == bfd_link_hash_undefined)
5006 && (IS_X86_64_PCREL_TYPE (r_type)
5007 || r_type == R_X86_64_SIZE32
5008 || r_type == R_X86_64_SIZE64))
5010 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
5011 && !resolved_to_zero)
5012 || h->root.type != bfd_link_hash_undefweak))
5013 && ((! IS_X86_64_PCREL_TYPE (r_type)
5014 && r_type != R_X86_64_SIZE32
5015 && r_type != R_X86_64_SIZE64)
5016 || ! SYMBOL_CALLS_LOCAL (info, h)))
5017 || (ELIMINATE_COPY_RELOCS
5018 && !bfd_link_pic (info)
5022 || eh->func_pointer_refcount > 0
5023 || (h->root.type == bfd_link_hash_undefweak
5024 && !resolved_to_zero))
5025 && ((h->def_dynamic && !h->def_regular)
5026 /* Undefined weak symbol is bound locally when
5028 || h->root.type == bfd_link_hash_undefined)))
5030 Elf_Internal_Rela outrel;
5031 bfd_boolean skip, relocate;
5034 /* When generating a shared object, these relocations
5035 are copied into the output file to be resolved at run
5041 _bfd_elf_section_offset (output_bfd, info, input_section,
5043 if (outrel.r_offset == (bfd_vma) -1)
5045 else if (outrel.r_offset == (bfd_vma) -2)
5046 skip = TRUE, relocate = TRUE;
5048 outrel.r_offset += (input_section->output_section->vma
5049 + input_section->output_offset);
5052 memset (&outrel, 0, sizeof outrel);
5054 /* h->dynindx may be -1 if this symbol was marked to
5058 && (IS_X86_64_PCREL_TYPE (r_type)
5059 || !(bfd_link_executable (info)
5060 || SYMBOLIC_BIND (info, h))
5061 || ! h->def_regular))
5063 outrel.r_info = htab->r_info (h->dynindx, r_type);
5064 outrel.r_addend = rel->r_addend;
5068 /* This symbol is local, or marked to become local.
5069 When relocation overflow check is disabled, we
5070 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
5071 if (r_type == htab->pointer_r_type
5072 || (r_type == R_X86_64_32
5073 && info->no_reloc_overflow_check))
5076 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5077 outrel.r_addend = relocation + rel->r_addend;
5079 else if (r_type == R_X86_64_64
5080 && !ABI_64_P (output_bfd))
5083 outrel.r_info = htab->r_info (0,
5084 R_X86_64_RELATIVE64);
5085 outrel.r_addend = relocation + rel->r_addend;
5086 /* Check addend overflow. */
5087 if ((outrel.r_addend & 0x80000000)
5088 != (rel->r_addend & 0x80000000))
5091 int addend = rel->r_addend;
5092 if (h && h->root.root.string)
5093 name = h->root.root.string;
5095 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
5098 /* xgettext:c-format */
5099 (_("%B: addend %s%#x in relocation %s against "
5100 "symbol `%s' at %#Lx in section `%A' is "
5102 input_bfd, addend < 0 ? "-" : "", addend,
5103 howto->name, name, rel->r_offset, input_section);
5104 bfd_set_error (bfd_error_bad_value);
5112 if (bfd_is_abs_section (sec))
5114 else if (sec == NULL || sec->owner == NULL)
5116 bfd_set_error (bfd_error_bad_value);
5123 /* We are turning this relocation into one
5124 against a section symbol. It would be
5125 proper to subtract the symbol's value,
5126 osec->vma, from the emitted reloc addend,
5127 but ld.so expects buggy relocs. */
5128 osec = sec->output_section;
5129 sindx = elf_section_data (osec)->dynindx;
5132 asection *oi = htab->elf.text_index_section;
5133 sindx = elf_section_data (oi)->dynindx;
5135 BFD_ASSERT (sindx != 0);
5138 outrel.r_info = htab->r_info (sindx, r_type);
5139 outrel.r_addend = relocation + rel->r_addend;
5143 sreloc = elf_section_data (input_section)->sreloc;
5145 if (sreloc == NULL || sreloc->contents == NULL)
5147 r = bfd_reloc_notsupported;
5148 goto check_relocation_error;
5151 elf_append_rela (output_bfd, sreloc, &outrel);
5153 /* If this reloc is against an external symbol, we do
5154 not want to fiddle with the addend. Otherwise, we
5155 need to include the symbol value so that it becomes
5156 an addend for the dynamic reloc. */
5163 case R_X86_64_TLSGD:
5164 case R_X86_64_GOTPC32_TLSDESC:
5165 case R_X86_64_TLSDESC_CALL:
5166 case R_X86_64_GOTTPOFF:
5167 tls_type = GOT_UNKNOWN;
5168 if (h == NULL && local_got_offsets)
5169 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
5171 tls_type = elf_x86_64_hash_entry (h)->tls_type;
5173 if (! elf_x86_64_tls_transition (info, input_bfd,
5174 input_section, contents,
5175 symtab_hdr, sym_hashes,
5176 &r_type, tls_type, rel,
5177 relend, h, r_symndx, TRUE))
5180 if (r_type == R_X86_64_TPOFF32)
5182 bfd_vma roff = rel->r_offset;
5184 BFD_ASSERT (! unresolved_reloc);
5186 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5188 /* GD->LE transition. For 64bit, change
5189 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5190 .word 0x6666; rex64; call __tls_get_addr@PLT
5192 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5194 call *__tls_get_addr@GOTPCREL(%rip)
5195 which may be converted to
5196 addr32 call __tls_get_addr
5199 leaq foo@tpoff(%rax), %rax
5201 leaq foo@tlsgd(%rip), %rdi
5202 .word 0x6666; rex64; call __tls_get_addr@PLT
5204 leaq foo@tlsgd(%rip), %rdi
5206 call *__tls_get_addr@GOTPCREL(%rip)
5207 which may be converted to
5208 addr32 call __tls_get_addr
5211 leaq foo@tpoff(%rax), %rax
5212 For largepic, change:
5213 leaq foo@tlsgd(%rip), %rdi
5214 movabsq $__tls_get_addr@pltoff, %rax
5219 leaq foo@tpoff(%rax), %rax
5220 nopw 0x0(%rax,%rax,1) */
5222 if (ABI_64_P (output_bfd))
5224 if (contents[roff + 5] == 0xb8)
5226 memcpy (contents + roff - 3,
5227 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
5228 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5232 memcpy (contents + roff - 4,
5233 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5237 memcpy (contents + roff - 3,
5238 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5240 bfd_put_32 (output_bfd,
5241 elf_x86_64_tpoff (info, relocation),
5242 contents + roff + 8 + largepic);
5243 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
5244 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
5249 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5251 /* GDesc -> LE transition.
5252 It's originally something like:
5253 leaq x@tlsdesc(%rip), %rax
5256 movl $x@tpoff, %rax. */
5258 unsigned int val, type;
5260 type = bfd_get_8 (input_bfd, contents + roff - 3);
5261 val = bfd_get_8 (input_bfd, contents + roff - 1);
5262 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
5263 contents + roff - 3);
5264 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
5265 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
5266 contents + roff - 1);
5267 bfd_put_32 (output_bfd,
5268 elf_x86_64_tpoff (info, relocation),
5272 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5274 /* GDesc -> LE transition.
5279 bfd_put_8 (output_bfd, 0x66, contents + roff);
5280 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5283 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
5285 /* IE->LE transition:
5286 For 64bit, originally it can be one of:
5287 movq foo@gottpoff(%rip), %reg
5288 addq foo@gottpoff(%rip), %reg
5291 leaq foo(%reg), %reg
5293 For 32bit, originally it can be one of:
5294 movq foo@gottpoff(%rip), %reg
5295 addl foo@gottpoff(%rip), %reg
5298 leal foo(%reg), %reg
5301 unsigned int val, type, reg;
5304 val = bfd_get_8 (input_bfd, contents + roff - 3);
5307 type = bfd_get_8 (input_bfd, contents + roff - 2);
5308 reg = bfd_get_8 (input_bfd, contents + roff - 1);
5314 bfd_put_8 (output_bfd, 0x49,
5315 contents + roff - 3);
5316 else if (!ABI_64_P (output_bfd) && val == 0x44)
5317 bfd_put_8 (output_bfd, 0x41,
5318 contents + roff - 3);
5319 bfd_put_8 (output_bfd, 0xc7,
5320 contents + roff - 2);
5321 bfd_put_8 (output_bfd, 0xc0 | reg,
5322 contents + roff - 1);
5326 /* addq/addl -> addq/addl - addressing with %rsp/%r12
5329 bfd_put_8 (output_bfd, 0x49,
5330 contents + roff - 3);
5331 else if (!ABI_64_P (output_bfd) && val == 0x44)
5332 bfd_put_8 (output_bfd, 0x41,
5333 contents + roff - 3);
5334 bfd_put_8 (output_bfd, 0x81,
5335 contents + roff - 2);
5336 bfd_put_8 (output_bfd, 0xc0 | reg,
5337 contents + roff - 1);
5341 /* addq/addl -> leaq/leal */
5343 bfd_put_8 (output_bfd, 0x4d,
5344 contents + roff - 3);
5345 else if (!ABI_64_P (output_bfd) && val == 0x44)
5346 bfd_put_8 (output_bfd, 0x45,
5347 contents + roff - 3);
5348 bfd_put_8 (output_bfd, 0x8d,
5349 contents + roff - 2);
5350 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
5351 contents + roff - 1);
5353 bfd_put_32 (output_bfd,
5354 elf_x86_64_tpoff (info, relocation),
5362 if (htab->elf.sgot == NULL)
5367 off = h->got.offset;
5368 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
5372 if (local_got_offsets == NULL)
5375 off = local_got_offsets[r_symndx];
5376 offplt = local_tlsdesc_gotents[r_symndx];
5383 Elf_Internal_Rela outrel;
5387 if (htab->elf.srelgot == NULL)
5390 indx = h && h->dynindx != -1 ? h->dynindx : 0;
5392 if (GOT_TLS_GDESC_P (tls_type))
5394 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
5395 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
5396 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
5397 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
5398 + htab->elf.sgotplt->output_offset
5400 + htab->sgotplt_jump_table_size);
5401 sreloc = htab->elf.srelplt;
5403 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5405 outrel.r_addend = 0;
5406 elf_append_rela (output_bfd, sreloc, &outrel);
5409 sreloc = htab->elf.srelgot;
5411 outrel.r_offset = (htab->elf.sgot->output_section->vma
5412 + htab->elf.sgot->output_offset + off);
5414 if (GOT_TLS_GD_P (tls_type))
5415 dr_type = R_X86_64_DTPMOD64;
5416 else if (GOT_TLS_GDESC_P (tls_type))
5419 dr_type = R_X86_64_TPOFF64;
5421 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
5422 outrel.r_addend = 0;
5423 if ((dr_type == R_X86_64_TPOFF64
5424 || dr_type == R_X86_64_TLSDESC) && indx == 0)
5425 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5426 outrel.r_info = htab->r_info (indx, dr_type);
5428 elf_append_rela (output_bfd, sreloc, &outrel);
5430 if (GOT_TLS_GD_P (tls_type))
5434 BFD_ASSERT (! unresolved_reloc);
5435 bfd_put_64 (output_bfd,
5436 relocation - elf_x86_64_dtpoff_base (info),
5437 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5441 bfd_put_64 (output_bfd, 0,
5442 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5443 outrel.r_info = htab->r_info (indx,
5445 outrel.r_offset += GOT_ENTRY_SIZE;
5446 elf_append_rela (output_bfd, sreloc,
5455 local_got_offsets[r_symndx] |= 1;
5458 if (off >= (bfd_vma) -2
5459 && ! GOT_TLS_GDESC_P (tls_type))
5461 if (r_type == ELF32_R_TYPE (rel->r_info))
5463 if (r_type == R_X86_64_GOTPC32_TLSDESC
5464 || r_type == R_X86_64_TLSDESC_CALL)
5465 relocation = htab->elf.sgotplt->output_section->vma
5466 + htab->elf.sgotplt->output_offset
5467 + offplt + htab->sgotplt_jump_table_size;
5469 relocation = htab->elf.sgot->output_section->vma
5470 + htab->elf.sgot->output_offset + off;
5471 unresolved_reloc = FALSE;
5475 bfd_vma roff = rel->r_offset;
5477 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5479 /* GD->IE transition. For 64bit, change
5480 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5481 .word 0x6666; rex64; call __tls_get_addr@PLT
5483 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5485 call *__tls_get_addr@GOTPCREL(%rip
5486 which may be converted to
5487 addr32 call __tls_get_addr
5490 addq foo@gottpoff(%rip), %rax
5492 leaq foo@tlsgd(%rip), %rdi
5493 .word 0x6666; rex64; call __tls_get_addr@PLT
5495 leaq foo@tlsgd(%rip), %rdi
5497 call *__tls_get_addr@GOTPCREL(%rip)
5498 which may be converted to
5499 addr32 call __tls_get_addr
5502 addq foo@gottpoff(%rip), %rax
5503 For largepic, change:
5504 leaq foo@tlsgd(%rip), %rdi
5505 movabsq $__tls_get_addr@pltoff, %rax
5510 addq foo@gottpoff(%rax), %rax
5511 nopw 0x0(%rax,%rax,1) */
5513 if (ABI_64_P (output_bfd))
5515 if (contents[roff + 5] == 0xb8)
5517 memcpy (contents + roff - 3,
5518 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5519 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5523 memcpy (contents + roff - 4,
5524 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5528 memcpy (contents + roff - 3,
5529 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5532 relocation = (htab->elf.sgot->output_section->vma
5533 + htab->elf.sgot->output_offset + off
5536 - input_section->output_section->vma
5537 - input_section->output_offset
5539 bfd_put_32 (output_bfd, relocation,
5540 contents + roff + 8 + largepic);
5541 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5546 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5548 /* GDesc -> IE transition.
5549 It's originally something like:
5550 leaq x@tlsdesc(%rip), %rax
5553 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5555 /* Now modify the instruction as appropriate. To
5556 turn a leaq into a movq in the form we use it, it
5557 suffices to change the second byte from 0x8d to
5559 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5561 bfd_put_32 (output_bfd,
5562 htab->elf.sgot->output_section->vma
5563 + htab->elf.sgot->output_offset + off
5565 - input_section->output_section->vma
5566 - input_section->output_offset
5571 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5573 /* GDesc -> IE transition.
5580 bfd_put_8 (output_bfd, 0x66, contents + roff);
5581 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5589 case R_X86_64_TLSLD:
5590 if (! elf_x86_64_tls_transition (info, input_bfd,
5591 input_section, contents,
5592 symtab_hdr, sym_hashes,
5593 &r_type, GOT_UNKNOWN, rel,
5594 relend, h, r_symndx, TRUE))
5597 if (r_type != R_X86_64_TLSLD)
5599 /* LD->LE transition:
5600 leaq foo@tlsld(%rip), %rdi
5601 call __tls_get_addr@PLT
5602 For 64bit, we change it into:
5603 .word 0x6666; .byte 0x66; movq %fs:0, %rax
5604 For 32bit, we change it into:
5605 nopl 0x0(%rax); movl %fs:0, %eax
5607 leaq foo@tlsld(%rip), %rdi;
5608 call *__tls_get_addr@GOTPCREL(%rip)
5609 which may be converted to
5610 addr32 call __tls_get_addr
5611 For 64bit, we change it into:
5612 .word 0x6666; .word 0x6666; movq %fs:0, %rax
5613 For 32bit, we change it into:
5614 nopw 0x0(%rax); movl %fs:0, %eax
5615 For largepic, change:
5616 leaq foo@tlsgd(%rip), %rdi
5617 movabsq $__tls_get_addr@pltoff, %rax
5621 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
5624 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
5625 if (ABI_64_P (output_bfd))
5627 if (contents[rel->r_offset + 5] == 0xb8)
5628 memcpy (contents + rel->r_offset - 3,
5629 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5630 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5631 else if (contents[rel->r_offset + 4] == 0xff
5632 || contents[rel->r_offset + 4] == 0x67)
5633 memcpy (contents + rel->r_offset - 3,
5634 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
5637 memcpy (contents + rel->r_offset - 3,
5638 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5642 if (contents[rel->r_offset + 4] == 0xff)
5643 memcpy (contents + rel->r_offset - 3,
5644 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
5647 memcpy (contents + rel->r_offset - 3,
5648 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5650 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
5651 and R_X86_64_PLTOFF64. */
5657 if (htab->elf.sgot == NULL)
5660 off = htab->tls_ld_got.offset;
5665 Elf_Internal_Rela outrel;
5667 if (htab->elf.srelgot == NULL)
5670 outrel.r_offset = (htab->elf.sgot->output_section->vma
5671 + htab->elf.sgot->output_offset + off);
5673 bfd_put_64 (output_bfd, 0,
5674 htab->elf.sgot->contents + off);
5675 bfd_put_64 (output_bfd, 0,
5676 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5677 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
5678 outrel.r_addend = 0;
5679 elf_append_rela (output_bfd, htab->elf.srelgot,
5681 htab->tls_ld_got.offset |= 1;
5683 relocation = htab->elf.sgot->output_section->vma
5684 + htab->elf.sgot->output_offset + off;
5685 unresolved_reloc = FALSE;
5688 case R_X86_64_DTPOFF32:
5689 if (!bfd_link_executable (info)
5690 || (input_section->flags & SEC_CODE) == 0)
5691 relocation -= elf_x86_64_dtpoff_base (info);
5693 relocation = elf_x86_64_tpoff (info, relocation);
5696 case R_X86_64_TPOFF32:
5697 case R_X86_64_TPOFF64:
5698 BFD_ASSERT (bfd_link_executable (info));
5699 relocation = elf_x86_64_tpoff (info, relocation);
5702 case R_X86_64_DTPOFF64:
5703 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
5704 relocation -= elf_x86_64_dtpoff_base (info);
5711 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5712 because such sections are not SEC_ALLOC and thus ld.so will
5713 not process them. */
5714 if (unresolved_reloc
5715 && !((input_section->flags & SEC_DEBUGGING) != 0
5717 && _bfd_elf_section_offset (output_bfd, info, input_section,
5718 rel->r_offset) != (bfd_vma) -1)
5721 /* xgettext:c-format */
5722 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
5727 h->root.root.string);
5732 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5733 contents, rel->r_offset,
5734 relocation, rel->r_addend);
5736 check_relocation_error:
5737 if (r != bfd_reloc_ok)
5742 name = h->root.root.string;
5745 name = bfd_elf_string_from_elf_section (input_bfd,
5746 symtab_hdr->sh_link,
5751 name = bfd_section_name (input_bfd, sec);
5754 if (r == bfd_reloc_overflow)
5755 (*info->callbacks->reloc_overflow)
5756 (info, (h ? &h->root : NULL), name, howto->name,
5757 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5761 /* xgettext:c-format */
5762 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
5763 input_bfd, input_section,
5764 rel->r_offset, name, (int) r);
5775 Elf_Internal_Shdr *rel_hdr;
5776 size_t deleted = rel - wrel;
5778 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5779 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5780 if (rel_hdr->sh_size == 0)
5782 /* It is too late to remove an empty reloc section. Leave
5784 ??? What is wrong with an empty section??? */
5785 rel_hdr->sh_size = rel_hdr->sh_entsize;
5788 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5789 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5790 input_section->reloc_count -= deleted;
5796 /* Finish up dynamic symbol handling. We set the contents of various
5797 dynamic sections here. */
5800 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
5801 struct bfd_link_info *info,
5802 struct elf_link_hash_entry *h,
5803 Elf_Internal_Sym *sym)
5805 struct elf_x86_64_link_hash_table *htab;
5806 bfd_boolean use_plt_second;
5807 struct elf_x86_64_link_hash_entry *eh;
5808 bfd_boolean local_undefweak;
5810 htab = elf_x86_64_hash_table (info);
5814 /* Use the second PLT section only if there is .plt section. */
5815 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
5817 eh = (struct elf_x86_64_link_hash_entry *) h;
5818 if (eh->no_finish_dynamic_symbol)
5821 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5822 resolved undefined weak symbols in executable so that their
5823 references have value 0 at run-time. */
5824 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5828 if (h->plt.offset != (bfd_vma) -1)
5831 bfd_vma got_offset, plt_offset;
5832 Elf_Internal_Rela rela;
5834 asection *plt, *gotplt, *relplt, *resolved_plt;
5835 const struct elf_backend_data *bed;
5836 bfd_vma plt_got_pcrel_offset;
5838 /* When building a static executable, use .iplt, .igot.plt and
5839 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5840 if (htab->elf.splt != NULL)
5842 plt = htab->elf.splt;
5843 gotplt = htab->elf.sgotplt;
5844 relplt = htab->elf.srelplt;
5848 plt = htab->elf.iplt;
5849 gotplt = htab->elf.igotplt;
5850 relplt = htab->elf.irelplt;
5853 /* This symbol has an entry in the procedure linkage table. Set
5855 if ((h->dynindx == -1
5857 && !((h->forced_local || bfd_link_executable (info))
5859 && h->type == STT_GNU_IFUNC))
5865 /* Get the index in the procedure linkage table which
5866 corresponds to this symbol. This is the index of this symbol
5867 in all the symbols for which we are making plt entries. The
5868 first entry in the procedure linkage table is reserved.
5870 Get the offset into the .got table of the entry that
5871 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5872 bytes. The first three are reserved for the dynamic linker.
5874 For static executables, we don't reserve anything. */
5876 if (plt == htab->elf.splt)
5878 got_offset = (h->plt.offset / htab->plt.plt_entry_size
5879 - htab->plt.has_plt0);
5880 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5884 got_offset = h->plt.offset / htab->plt.plt_entry_size;
5885 got_offset = got_offset * GOT_ENTRY_SIZE;
5888 /* Fill in the entry in the procedure linkage table. */
5889 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
5890 htab->plt.plt_entry_size);
5893 memcpy (htab->plt_second->contents + eh->plt_second.offset,
5894 htab->non_lazy_plt->plt_entry,
5895 htab->non_lazy_plt->plt_entry_size);
5897 resolved_plt = htab->plt_second;
5898 plt_offset = eh->plt_second.offset;
5903 plt_offset = h->plt.offset;
5906 /* Insert the relocation positions of the plt section. */
5908 /* Put offset the PC-relative instruction referring to the GOT entry,
5909 subtracting the size of that instruction. */
5910 plt_got_pcrel_offset = (gotplt->output_section->vma
5911 + gotplt->output_offset
5913 - resolved_plt->output_section->vma
5914 - resolved_plt->output_offset
5916 - htab->plt.plt_got_insn_size);
5918 /* Check PC-relative offset overflow in PLT entry. */
5919 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5920 /* xgettext:c-format */
5921 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5922 output_bfd, h->root.root.string);
5924 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5925 (resolved_plt->contents + plt_offset
5926 + htab->plt.plt_got_offset));
5928 /* Fill in the entry in the global offset table, initially this
5929 points to the second part of the PLT entry. Leave the entry
5930 as zero for undefined weak symbol in PIE. No PLT relocation
5931 against undefined weak symbol in PIE. */
5932 if (!local_undefweak)
5934 if (htab->plt.has_plt0)
5935 bfd_put_64 (output_bfd, (plt->output_section->vma
5936 + plt->output_offset
5938 + htab->lazy_plt->plt_lazy_offset),
5939 gotplt->contents + got_offset);
5941 /* Fill in the entry in the .rela.plt section. */
5942 rela.r_offset = (gotplt->output_section->vma
5943 + gotplt->output_offset
5945 if (h->dynindx == -1
5946 || ((bfd_link_executable (info)
5947 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5949 && h->type == STT_GNU_IFUNC))
5951 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5952 h->root.root.string,
5953 h->root.u.def.section->owner);
5955 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5956 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5957 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5958 rela.r_addend = (h->root.u.def.value
5959 + h->root.u.def.section->output_section->vma
5960 + h->root.u.def.section->output_offset);
5961 /* R_X86_64_IRELATIVE comes last. */
5962 plt_index = htab->next_irelative_index--;
5966 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5968 plt_index = htab->next_jump_slot_index++;
5971 /* Don't fill the second and third slots in PLT entry for
5972 static executables nor without PLT0. */
5973 if (plt == htab->elf.splt && htab->plt.has_plt0)
5976 = h->plt.offset + htab->lazy_plt->plt_plt_insn_end;
5978 /* Put relocation index. */
5979 bfd_put_32 (output_bfd, plt_index,
5980 (plt->contents + h->plt.offset
5981 + htab->lazy_plt->plt_reloc_offset));
5983 /* Put offset for jmp .PLT0 and check for overflow. We don't
5984 check relocation index for overflow since branch displacement
5985 will overflow first. */
5986 if (plt0_offset > 0x80000000)
5987 /* xgettext:c-format */
5988 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5989 output_bfd, h->root.root.string);
5990 bfd_put_32 (output_bfd, - plt0_offset,
5991 (plt->contents + h->plt.offset
5992 + htab->lazy_plt->plt_plt_offset));
5995 bed = get_elf_backend_data (output_bfd);
5996 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5997 bed->s->swap_reloca_out (output_bfd, &rela, loc);
6000 else if (eh->plt_got.offset != (bfd_vma) -1)
6002 bfd_vma got_offset, plt_offset;
6003 asection *plt, *got;
6004 bfd_boolean got_after_plt;
6005 int32_t got_pcrel_offset;
6007 /* Set the entry in the GOT procedure linkage table. */
6008 plt = htab->plt_got;
6009 got = htab->elf.sgot;
6010 got_offset = h->got.offset;
6012 if (got_offset == (bfd_vma) -1
6013 || (h->type == STT_GNU_IFUNC && h->def_regular)
6018 /* Use the non-lazy PLT entry template for the GOT PLT since they
6019 are the identical. */
6020 /* Fill in the entry in the GOT procedure linkage table. */
6021 plt_offset = eh->plt_got.offset;
6022 memcpy (plt->contents + plt_offset,
6023 htab->non_lazy_plt->plt_entry,
6024 htab->non_lazy_plt->plt_entry_size);
6026 /* Put offset the PC-relative instruction referring to the GOT
6027 entry, subtracting the size of that instruction. */
6028 got_pcrel_offset = (got->output_section->vma
6029 + got->output_offset
6031 - plt->output_section->vma
6032 - plt->output_offset
6034 - htab->non_lazy_plt->plt_got_insn_size);
6036 /* Check PC-relative offset overflow in GOT PLT entry. */
6037 got_after_plt = got->output_section->vma > plt->output_section->vma;
6038 if ((got_after_plt && got_pcrel_offset < 0)
6039 || (!got_after_plt && got_pcrel_offset > 0))
6040 /* xgettext:c-format */
6041 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
6042 output_bfd, h->root.root.string);
6044 bfd_put_32 (output_bfd, got_pcrel_offset,
6045 (plt->contents + plt_offset
6046 + htab->non_lazy_plt->plt_got_offset));
6049 if (!local_undefweak
6051 && (h->plt.offset != (bfd_vma) -1
6052 || eh->plt_got.offset != (bfd_vma) -1))
6054 /* Mark the symbol as undefined, rather than as defined in
6055 the .plt section. Leave the value if there were any
6056 relocations where pointer equality matters (this is a clue
6057 for the dynamic linker, to make function pointer
6058 comparisons work between an application and shared
6059 library), otherwise set it to zero. If a function is only
6060 called from a binary, there is no need to slow down
6061 shared libraries because of that. */
6062 sym->st_shndx = SHN_UNDEF;
6063 if (!h->pointer_equality_needed)
6067 /* Don't generate dynamic GOT relocation against undefined weak
6068 symbol in executable. */
6069 if (h->got.offset != (bfd_vma) -1
6070 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
6071 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE
6072 && !local_undefweak)
6074 Elf_Internal_Rela rela;
6075 asection *relgot = htab->elf.srelgot;
6077 /* This symbol has an entry in the global offset table. Set it
6079 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
6082 rela.r_offset = (htab->elf.sgot->output_section->vma
6083 + htab->elf.sgot->output_offset
6084 + (h->got.offset &~ (bfd_vma) 1));
6086 /* If this is a static link, or it is a -Bsymbolic link and the
6087 symbol is defined locally or was forced to be local because
6088 of a version file, we just want to emit a RELATIVE reloc.
6089 The entry in the global offset table will already have been
6090 initialized in the relocate_section function. */
6092 && h->type == STT_GNU_IFUNC)
6094 if (h->plt.offset == (bfd_vma) -1)
6096 /* STT_GNU_IFUNC is referenced without PLT. */
6097 if (htab->elf.splt == NULL)
6099 /* use .rel[a].iplt section to store .got relocations
6100 in static executable. */
6101 relgot = htab->elf.irelplt;
6103 if (SYMBOL_REFERENCES_LOCAL (info, h))
6105 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
6107 h->root.root.string,
6108 h->root.u.def.section->owner);
6110 rela.r_info = htab->r_info (0,
6111 R_X86_64_IRELATIVE);
6112 rela.r_addend = (h->root.u.def.value
6113 + h->root.u.def.section->output_section->vma
6114 + h->root.u.def.section->output_offset);
6119 else if (bfd_link_pic (info))
6121 /* Generate R_X86_64_GLOB_DAT. */
6129 if (!h->pointer_equality_needed)
6132 /* For non-shared object, we can't use .got.plt, which
6133 contains the real function addres if we need pointer
6134 equality. We load the GOT entry with the PLT entry. */
6135 if (htab->plt_second != NULL)
6137 plt = htab->plt_second;
6138 plt_offset = eh->plt_second.offset;
6142 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
6143 plt_offset = h->plt.offset;
6145 bfd_put_64 (output_bfd, (plt->output_section->vma
6146 + plt->output_offset
6148 htab->elf.sgot->contents + h->got.offset);
6152 else if (bfd_link_pic (info)
6153 && SYMBOL_REFERENCES_LOCAL (info, h))
6155 if (!h->def_regular)
6157 BFD_ASSERT((h->got.offset & 1) != 0);
6158 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
6159 rela.r_addend = (h->root.u.def.value
6160 + h->root.u.def.section->output_section->vma
6161 + h->root.u.def.section->output_offset);
6165 BFD_ASSERT((h->got.offset & 1) == 0);
6167 bfd_put_64 (output_bfd, (bfd_vma) 0,
6168 htab->elf.sgot->contents + h->got.offset);
6169 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
6173 elf_append_rela (output_bfd, relgot, &rela);
6178 Elf_Internal_Rela rela;
6181 /* This symbol needs a copy reloc. Set it up. */
6183 if (h->dynindx == -1
6184 || (h->root.type != bfd_link_hash_defined
6185 && h->root.type != bfd_link_hash_defweak)
6186 || htab->elf.srelbss == NULL
6187 || htab->elf.sreldynrelro == NULL)
6190 rela.r_offset = (h->root.u.def.value
6191 + h->root.u.def.section->output_section->vma
6192 + h->root.u.def.section->output_offset);
6193 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
6195 if (h->root.u.def.section == htab->elf.sdynrelro)
6196 s = htab->elf.sreldynrelro;
6198 s = htab->elf.srelbss;
6199 elf_append_rela (output_bfd, s, &rela);
6205 /* Finish up local dynamic symbol handling. We set the contents of
6206 various dynamic sections here. */
6209 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
6211 struct elf_link_hash_entry *h
6212 = (struct elf_link_hash_entry *) *slot;
6213 struct bfd_link_info *info
6214 = (struct bfd_link_info *) inf;
6216 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
6220 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
6221 here since undefined weak symbol may not be dynamic and may not be
6222 called for elf_x86_64_finish_dynamic_symbol. */
6225 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
6228 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
6229 struct bfd_link_info *info = (struct bfd_link_info *) inf;
6231 if (h->root.type != bfd_link_hash_undefweak
6232 || h->dynindx != -1)
6235 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
6239 /* Used to decide how to sort relocs in an optimal manner for the
6240 dynamic linker, before writing them out. */
6242 static enum elf_reloc_type_class
6243 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
6244 const asection *rel_sec ATTRIBUTE_UNUSED,
6245 const Elf_Internal_Rela *rela)
6247 bfd *abfd = info->output_bfd;
6248 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
6249 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
6251 if (htab->elf.dynsym != NULL
6252 && htab->elf.dynsym->contents != NULL)
6254 /* Check relocation against STT_GNU_IFUNC symbol if there are
6256 unsigned long r_symndx = htab->r_sym (rela->r_info);
6257 if (r_symndx != STN_UNDEF)
6259 Elf_Internal_Sym sym;
6260 if (!bed->s->swap_symbol_in (abfd,
6261 (htab->elf.dynsym->contents
6262 + r_symndx * bed->s->sizeof_sym),
6266 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
6267 return reloc_class_ifunc;
6271 switch ((int) ELF32_R_TYPE (rela->r_info))
6273 case R_X86_64_IRELATIVE:
6274 return reloc_class_ifunc;
6275 case R_X86_64_RELATIVE:
6276 case R_X86_64_RELATIVE64:
6277 return reloc_class_relative;
6278 case R_X86_64_JUMP_SLOT:
6279 return reloc_class_plt;
6281 return reloc_class_copy;
6283 return reloc_class_normal;
6287 /* Finish up the dynamic sections. */
6290 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
6291 struct bfd_link_info *info)
6293 struct elf_x86_64_link_hash_table *htab;
6297 htab = elf_x86_64_hash_table (info);
6301 dynobj = htab->elf.dynobj;
6302 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
6304 if (htab->elf.dynamic_sections_created)
6306 bfd_byte *dyncon, *dynconend;
6307 const struct elf_backend_data *bed;
6308 bfd_size_type sizeof_dyn;
6310 if (sdyn == NULL || htab->elf.sgot == NULL)
6313 bed = get_elf_backend_data (dynobj);
6314 sizeof_dyn = bed->s->sizeof_dyn;
6315 dyncon = sdyn->contents;
6316 dynconend = sdyn->contents + sdyn->size;
6317 for (; dyncon < dynconend; dyncon += sizeof_dyn)
6319 Elf_Internal_Dyn dyn;
6322 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
6330 s = htab->elf.sgotplt;
6331 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
6335 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
6339 s = htab->elf.srelplt->output_section;
6340 dyn.d_un.d_val = s->size;
6343 case DT_TLSDESC_PLT:
6345 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
6346 + htab->tlsdesc_plt;
6349 case DT_TLSDESC_GOT:
6351 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
6352 + htab->tlsdesc_got;
6356 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
6359 if (htab->elf.splt && htab->elf.splt->size > 0)
6361 elf_section_data (htab->elf.splt->output_section)
6362 ->this_hdr.sh_entsize = htab->plt.plt_entry_size;
6364 if (htab->plt.has_plt0)
6366 /* Fill in the special first entry in the procedure linkage
6368 memcpy (htab->elf.splt->contents,
6369 htab->lazy_plt->plt0_entry,
6370 htab->lazy_plt->plt_entry_size);
6371 /* Add offset for pushq GOT+8(%rip), since the instruction
6372 uses 6 bytes subtract this value. */
6373 bfd_put_32 (output_bfd,
6374 (htab->elf.sgotplt->output_section->vma
6375 + htab->elf.sgotplt->output_offset
6377 - htab->elf.splt->output_section->vma
6378 - htab->elf.splt->output_offset
6380 (htab->elf.splt->contents
6381 + htab->lazy_plt->plt0_got1_offset));
6382 /* Add offset for the PC-relative instruction accessing
6383 GOT+16, subtracting the offset to the end of that
6385 bfd_put_32 (output_bfd,
6386 (htab->elf.sgotplt->output_section->vma
6387 + htab->elf.sgotplt->output_offset
6389 - htab->elf.splt->output_section->vma
6390 - htab->elf.splt->output_offset
6391 - htab->lazy_plt->plt0_got2_insn_end),
6392 (htab->elf.splt->contents
6393 + htab->lazy_plt->plt0_got2_offset));
6395 if (htab->tlsdesc_plt)
6397 bfd_put_64 (output_bfd, (bfd_vma) 0,
6398 htab->elf.sgot->contents + htab->tlsdesc_got);
6400 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
6401 htab->lazy_plt->plt0_entry,
6402 htab->lazy_plt->plt_entry_size);
6404 /* Add offset for pushq GOT+8(%rip), since the
6405 instruction uses 6 bytes subtract this value. */
6406 bfd_put_32 (output_bfd,
6407 (htab->elf.sgotplt->output_section->vma
6408 + htab->elf.sgotplt->output_offset
6410 - htab->elf.splt->output_section->vma
6411 - htab->elf.splt->output_offset
6414 (htab->elf.splt->contents
6416 + htab->lazy_plt->plt0_got1_offset));
6417 /* Add offset for the PC-relative instruction accessing
6418 GOT+TDG, where TDG stands for htab->tlsdesc_got,
6419 subtracting the offset to the end of that
6421 bfd_put_32 (output_bfd,
6422 (htab->elf.sgot->output_section->vma
6423 + htab->elf.sgot->output_offset
6425 - htab->elf.splt->output_section->vma
6426 - htab->elf.splt->output_offset
6428 - htab->lazy_plt->plt0_got2_insn_end),
6429 (htab->elf.splt->contents
6431 + htab->lazy_plt->plt0_got2_offset));
6437 if (htab->plt_got != NULL && htab->plt_got->size > 0)
6438 elf_section_data (htab->plt_got->output_section)
6439 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
6441 if (htab->plt_second != NULL && htab->plt_second->size > 0)
6442 elf_section_data (htab->plt_second->output_section)
6443 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
6445 /* GOT is always created in setup_gnu_properties. But it may not be
6447 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
6449 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
6452 (_("discarded output section: `%A'"), htab->elf.sgotplt);
6456 /* Set the first entry in the global offset table to the address of
6457 the dynamic section. */
6459 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
6461 bfd_put_64 (output_bfd,
6462 sdyn->output_section->vma + sdyn->output_offset,
6463 htab->elf.sgotplt->contents);
6464 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
6465 bfd_put_64 (output_bfd, (bfd_vma) 0,
6466 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
6467 bfd_put_64 (output_bfd, (bfd_vma) 0,
6468 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
6470 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize
6474 /* Adjust .eh_frame for .plt section. */
6475 if (htab->plt_eh_frame != NULL
6476 && htab->plt_eh_frame->contents != NULL)
6478 if (htab->elf.splt != NULL
6479 && htab->elf.splt->size != 0
6480 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
6481 && htab->elf.splt->output_section != NULL
6482 && htab->plt_eh_frame->output_section != NULL)
6484 bfd_vma plt_start = htab->elf.splt->output_section->vma;
6485 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
6486 + htab->plt_eh_frame->output_offset
6487 + PLT_FDE_START_OFFSET;
6488 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6489 htab->plt_eh_frame->contents
6490 + PLT_FDE_START_OFFSET);
6492 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6494 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6496 htab->plt_eh_frame->contents))
6501 /* Adjust .eh_frame for .plt.got section. */
6502 if (htab->plt_got_eh_frame != NULL
6503 && htab->plt_got_eh_frame->contents != NULL)
6505 if (htab->plt_got != NULL
6506 && htab->plt_got->size != 0
6507 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
6508 && htab->plt_got->output_section != NULL
6509 && htab->plt_got_eh_frame->output_section != NULL)
6511 bfd_vma plt_start = htab->plt_got->output_section->vma;
6512 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
6513 + htab->plt_got_eh_frame->output_offset
6514 + PLT_FDE_START_OFFSET;
6515 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6516 htab->plt_got_eh_frame->contents
6517 + PLT_FDE_START_OFFSET);
6519 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6521 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6522 htab->plt_got_eh_frame,
6523 htab->plt_got_eh_frame->contents))
6528 /* Adjust .eh_frame for the second PLT section. */
6529 if (htab->plt_second_eh_frame != NULL
6530 && htab->plt_second_eh_frame->contents != NULL)
6532 if (htab->plt_second != NULL
6533 && htab->plt_second->size != 0
6534 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
6535 && htab->plt_second->output_section != NULL
6536 && htab->plt_second_eh_frame->output_section != NULL)
6538 bfd_vma plt_start = htab->plt_second->output_section->vma;
6539 bfd_vma eh_frame_start
6540 = (htab->plt_second_eh_frame->output_section->vma
6541 + htab->plt_second_eh_frame->output_offset
6542 + PLT_FDE_START_OFFSET);
6543 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6544 htab->plt_second_eh_frame->contents
6545 + PLT_FDE_START_OFFSET);
6547 if (htab->plt_second_eh_frame->sec_info_type
6548 == SEC_INFO_TYPE_EH_FRAME)
6550 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6551 htab->plt_second_eh_frame,
6552 htab->plt_second_eh_frame->contents))
6557 if (htab->elf.sgot && htab->elf.sgot->size > 0)
6558 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
6561 /* Fill PLT entries for undefined weak symbols in PIE. */
6562 if (bfd_link_pie (info))
6563 bfd_hash_traverse (&info->hash->table,
6564 elf_x86_64_pie_finish_undefweak_symbol,
6570 /* Fill PLT/GOT entries and allocate dynamic relocations for local
6571 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6572 It has to be done before elf_link_sort_relocs is called so that
6573 dynamic relocations are properly sorted. */
6576 elf_x86_64_output_arch_local_syms
6577 (bfd *output_bfd ATTRIBUTE_UNUSED,
6578 struct bfd_link_info *info,
6579 void *flaginfo ATTRIBUTE_UNUSED,
6580 int (*func) (void *, const char *,
6583 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
6585 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
6589 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6590 htab_traverse (htab->loc_hash_table,
6591 elf_x86_64_finish_local_dynamic_symbol,
6597 /* Sort relocs into address order. */
6600 compare_relocs (const void *ap, const void *bp)
6602 const arelent *a = * (const arelent **) ap;
6603 const arelent *b = * (const arelent **) bp;
6605 if (a->address > b->address)
6607 else if (a->address < b->address)
6613 enum elf_x86_64_plt_type
6617 plt_second = 1 << 1,
6621 struct elf_x86_64_plt
6626 enum elf_x86_64_plt_type type;
6627 unsigned int plt_got_offset;
6628 unsigned int plt_got_insn_size;
6629 unsigned int plt_entry_size;
6633 /* Forward declaration. */
6634 static const struct elf_x86_64_lazy_plt_layout elf_x86_64_nacl_plt;
6636 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
6637 dynamic relocations. */
6640 elf_x86_64_get_synthetic_symtab (bfd *abfd,
6641 long symcount ATTRIBUTE_UNUSED,
6642 asymbol **syms ATTRIBUTE_UNUSED,
6647 long size, count, i, n, len;
6649 unsigned int plt_got_offset, plt_entry_size, plt_got_insn_size;
6651 bfd_byte *plt_contents;
6652 long dynrelcount, relsize;
6653 arelent **dynrelbuf, *p;
6654 const struct elf_x86_64_lazy_plt_layout *lazy_plt;
6655 const struct elf_x86_64_non_lazy_plt_layout *non_lazy_plt;
6656 const struct elf_x86_64_lazy_plt_layout *lazy_bnd_plt;
6657 const struct elf_x86_64_non_lazy_plt_layout *non_lazy_bnd_plt;
6658 const struct elf_x86_64_lazy_plt_layout *lazy_ibt_plt;
6659 const struct elf_x86_64_non_lazy_plt_layout *non_lazy_ibt_plt;
6662 enum elf_x86_64_plt_type plt_type;
6663 struct elf_x86_64_plt plts[] =
6665 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
6666 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
6667 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
6668 { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 },
6669 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
6674 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
6677 if (dynsymcount <= 0)
6680 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
6684 dynrelbuf = (arelent **) bfd_malloc (relsize);
6685 if (dynrelbuf == NULL)
6688 dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf,
6691 /* Sort the relocs by address. */
6692 qsort (dynrelbuf, dynrelcount, sizeof (arelent *), compare_relocs);
6694 if (get_elf_x86_64_backend_data (abfd)->os == is_normal)
6696 lazy_plt = &elf_x86_64_lazy_plt;
6697 non_lazy_plt = &elf_x86_64_non_lazy_plt;
6698 lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt;
6699 non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt;
6700 if (ABI_64_P (abfd))
6702 lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
6703 non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
6707 lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
6708 non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
6713 lazy_plt = &elf_x86_64_nacl_plt;
6714 non_lazy_plt = NULL;
6715 lazy_bnd_plt = NULL;
6716 non_lazy_bnd_plt = NULL;
6717 lazy_ibt_plt = NULL;
6718 non_lazy_ibt_plt = NULL;
6722 for (j = 0; plts[j].name != NULL; j++)
6724 plt = bfd_get_section_by_name (abfd, plts[j].name);
6728 /* Get the PLT section contents. */
6729 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6730 if (plt_contents == NULL)
6732 if (!bfd_get_section_contents (abfd, (asection *) plt,
6733 plt_contents, 0, plt->size))
6735 free (plt_contents);
6739 /* Check what kind of PLT it is. */
6740 plt_type = plt_unknown;
6741 if (plts[j].type == plt_unknown)
6743 /* Match lazy PLT first. Need to check the first two
6745 if ((memcmp (plt_contents, lazy_plt->plt0_entry,
6746 lazy_plt->plt0_got1_offset) == 0)
6747 && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6,
6749 plt_type = plt_lazy;
6750 else if (lazy_bnd_plt != NULL
6751 && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry,
6752 lazy_bnd_plt->plt0_got1_offset) == 0)
6753 && (memcmp (plt_contents + 6,
6754 lazy_bnd_plt->plt0_entry + 6, 3) == 0))
6756 plt_type = plt_lazy | plt_second;
6757 /* The fist entry in the lazy IBT PLT is the same as the
6759 if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size,
6760 lazy_ibt_plt->plt_entry,
6761 lazy_ibt_plt->plt_got_offset) == 0))
6762 lazy_plt = lazy_ibt_plt;
6764 lazy_plt = lazy_bnd_plt;
6768 if (non_lazy_plt != NULL
6769 && (plt_type == plt_unknown || plt_type == plt_non_lazy))
6771 /* Match non-lazy PLT. */
6772 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
6773 non_lazy_plt->plt_got_offset) == 0)
6774 plt_type = plt_non_lazy;
6777 if (plt_type == plt_unknown || plt_type == plt_second)
6779 if (non_lazy_bnd_plt != NULL
6780 && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry,
6781 non_lazy_bnd_plt->plt_got_offset) == 0))
6783 /* Match BND PLT. */
6784 plt_type = plt_second;
6785 non_lazy_plt = non_lazy_bnd_plt;
6787 else if (non_lazy_ibt_plt != NULL
6788 && (memcmp (plt_contents,
6789 non_lazy_ibt_plt->plt_entry,
6790 non_lazy_ibt_plt->plt_got_offset) == 0))
6792 /* Match IBT PLT. */
6793 plt_type = plt_second;
6794 non_lazy_plt = non_lazy_ibt_plt;
6798 if (plt_type == plt_unknown)
6802 plts[j].type = plt_type;
6804 if ((plt_type & plt_lazy))
6806 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
6807 plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size;
6808 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
6809 /* Skip PLT0 in lazy PLT. */
6814 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
6815 plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size;
6816 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
6820 /* Skip lazy PLT when the second PLT is used. */
6821 if (plt_type == (plt_lazy | plt_second))
6825 n = plt->size / plts[j].plt_entry_size;
6830 plts[j].contents = plt_contents;
6833 size = count * sizeof (asymbol);
6835 /* Allocate space for @plt suffixes. */
6837 for (i = 0; i < dynrelcount; i++)
6840 size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
6842 size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd);
6845 s = *ret = (asymbol *) bfd_zmalloc (size);
6849 for (j = 0; plts[j].name != NULL; j++)
6850 if (plts[j].contents != NULL)
6851 free (plts[j].contents);
6856 /* Check for each PLT section. */
6857 names = (char *) (s + count);
6860 for (j = 0; plts[j].name != NULL; j++)
6861 if ((plt_contents = plts[j].contents) != NULL)
6866 plt_got_offset = plts[j].plt_got_offset;
6867 plt_got_insn_size = plts[j].plt_got_insn_size;
6868 plt_entry_size = plts[j].plt_entry_size;
6872 if ((plts[j].type & plt_lazy))
6874 /* Skip PLT0 in lazy PLT. */
6876 offset = plt_entry_size;
6884 /* Check each PLT entry against dynamic relocations. */
6885 for (; k < plts[j].count; k++)
6891 /* Get the PC-relative offset, a signed 32-bit integer. */
6892 off = H_GET_32 (abfd, (plt_contents + offset
6894 got_vma = plt->vma + offset + off + plt_got_insn_size;
6896 /* Binary search. */
6900 while ((min + 1) < max)
6904 mid = (min + max) / 2;
6906 if (got_vma > r->address)
6908 else if (got_vma < r->address)
6917 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
6918 if (got_vma == p->address
6920 && (p->howto->type == R_X86_64_JUMP_SLOT
6921 || p->howto->type == R_X86_64_GLOB_DAT
6922 || p->howto->type == R_X86_64_IRELATIVE))
6924 *s = **p->sym_ptr_ptr;
6925 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
6926 set. Since we are defining a symbol, ensure one
6928 if ((s->flags & BSF_LOCAL) == 0)
6929 s->flags |= BSF_GLOBAL;
6930 s->flags |= BSF_SYNTHETIC;
6931 /* This is no longer a section symbol. */
6932 s->flags &= ~BSF_SECTION_SYM;
6934 s->the_bfd = plt->owner;
6938 len = strlen ((*p->sym_ptr_ptr)->name);
6939 memcpy (names, (*p->sym_ptr_ptr)->name, len);
6945 memcpy (names, "+0x", sizeof ("+0x") - 1);
6946 names += sizeof ("+0x") - 1;
6947 bfd_sprintf_vma (abfd, buf, p->addend);
6948 for (a = buf; *a == '0'; ++a)
6951 memcpy (names, a, size);
6954 memcpy (names, "@plt", sizeof ("@plt"));
6955 names += sizeof ("@plt");
6959 offset += plt_entry_size;
6963 /* PLT entries with R_X86_64_TLSDESC relocations are skipped. */
6969 for (j = 0; plts[j].name != NULL; j++)
6970 if (plts[j].contents != NULL)
6971 free (plts[j].contents);
6978 /* Handle an x86-64 specific section when reading an object file. This
6979 is called when elfcode.h finds a section with an unknown type. */
6982 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
6983 const char *name, int shindex)
6985 if (hdr->sh_type != SHT_X86_64_UNWIND)
6988 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
6994 /* Hook called by the linker routine which adds symbols from an object
6995 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6999 elf_x86_64_add_symbol_hook (bfd *abfd,
7000 struct bfd_link_info *info ATTRIBUTE_UNUSED,
7001 Elf_Internal_Sym *sym,
7002 const char **namep ATTRIBUTE_UNUSED,
7003 flagword *flagsp ATTRIBUTE_UNUSED,
7009 switch (sym->st_shndx)
7011 case SHN_X86_64_LCOMMON:
7012 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
7015 lcomm = bfd_make_section_with_flags (abfd,
7019 | SEC_LINKER_CREATED));
7022 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
7025 *valp = sym->st_size;
7033 /* Given a BFD section, try to locate the corresponding ELF section
7037 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
7038 asection *sec, int *index_return)
7040 if (sec == &_bfd_elf_large_com_section)
7042 *index_return = SHN_X86_64_LCOMMON;
7048 /* Process a symbol. */
7051 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
7054 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
7056 switch (elfsym->internal_elf_sym.st_shndx)
7058 case SHN_X86_64_LCOMMON:
7059 asym->section = &_bfd_elf_large_com_section;
7060 asym->value = elfsym->internal_elf_sym.st_size;
7061 /* Common symbol doesn't set BSF_GLOBAL. */
7062 asym->flags &= ~BSF_GLOBAL;
7068 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
7070 return (sym->st_shndx == SHN_COMMON
7071 || sym->st_shndx == SHN_X86_64_LCOMMON);
7075 elf_x86_64_common_section_index (asection *sec)
7077 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
7080 return SHN_X86_64_LCOMMON;
7084 elf_x86_64_common_section (asection *sec)
7086 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
7087 return bfd_com_section_ptr;
7089 return &_bfd_elf_large_com_section;
7093 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
7094 const Elf_Internal_Sym *sym,
7099 const asection *oldsec)
7101 /* A normal common symbol and a large common symbol result in a
7102 normal common symbol. We turn the large common symbol into a
7105 && h->root.type == bfd_link_hash_common
7107 && bfd_is_com_section (*psec)
7110 if (sym->st_shndx == SHN_COMMON
7111 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
7113 h->root.u.c.p->section
7114 = bfd_make_section_old_way (oldbfd, "COMMON");
7115 h->root.u.c.p->section->flags = SEC_ALLOC;
7117 else if (sym->st_shndx == SHN_X86_64_LCOMMON
7118 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
7119 *psec = bfd_com_section_ptr;
7126 elf_x86_64_additional_program_headers (bfd *abfd,
7127 struct bfd_link_info *info ATTRIBUTE_UNUSED)
7132 /* Check to see if we need a large readonly segment. */
7133 s = bfd_get_section_by_name (abfd, ".lrodata");
7134 if (s && (s->flags & SEC_LOAD))
7137 /* Check to see if we need a large data segment. Since .lbss sections
7138 is placed right after the .bss section, there should be no need for
7139 a large data segment just because of .lbss. */
7140 s = bfd_get_section_by_name (abfd, ".ldata");
7141 if (s && (s->flags & SEC_LOAD))
7147 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
7150 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
7152 if (h->plt.offset != (bfd_vma) -1
7154 && !h->pointer_equality_needed)
7157 return _bfd_elf_hash_symbol (h);
7160 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
7163 elf_x86_64_relocs_compatible (const bfd_target *input,
7164 const bfd_target *output)
7166 return ((xvec_get_elf_backend_data (input)->s->elfclass
7167 == xvec_get_elf_backend_data (output)->s->elfclass)
7168 && _bfd_elf_relocs_compatible (input, output));
7171 /* Parse x86-64 GNU properties. */
7173 static enum elf_property_kind
7174 elf_x86_64_parse_gnu_properties (bfd *abfd, unsigned int type,
7175 bfd_byte *ptr, unsigned int datasz)
7181 case GNU_PROPERTY_X86_ISA_1_USED:
7182 case GNU_PROPERTY_X86_ISA_1_NEEDED:
7183 case GNU_PROPERTY_X86_FEATURE_1_AND:
7187 ((type == GNU_PROPERTY_X86_ISA_1_USED
7188 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
7189 : (type == GNU_PROPERTY_X86_ISA_1_NEEDED
7190 ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>")
7191 : _("error: %B: <corrupt x86 feature size: 0x%x>"))),
7193 return property_corrupt;
7195 prop = _bfd_elf_get_property (abfd, type, datasz);
7196 /* Combine properties of the same type. */
7197 prop->u.number |= bfd_h_get_32 (abfd, ptr);
7198 prop->pr_kind = property_number;
7202 return property_ignored;
7205 return property_number;
7208 /* Merge x86-64 GNU property BPROP with APROP. If APROP isn't NULL,
7209 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
7210 should be merged with ABFD. */
7213 elf_x86_64_merge_gnu_properties (struct bfd_link_info *info,
7214 bfd *abfd ATTRIBUTE_UNUSED,
7215 elf_property *aprop,
7216 elf_property *bprop)
7218 unsigned int number, features;
7219 bfd_boolean updated = FALSE;
7220 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
7224 case GNU_PROPERTY_X86_ISA_1_USED:
7225 case GNU_PROPERTY_X86_ISA_1_NEEDED:
7226 if (aprop != NULL && bprop != NULL)
7228 number = aprop->u.number;
7229 aprop->u.number = number | bprop->u.number;
7230 updated = number != (unsigned int) aprop->u.number;
7234 /* Return TRUE if APROP is NULL to indicate that BPROP should
7235 be added to ABFD. */
7236 updated = aprop == NULL;
7240 case GNU_PROPERTY_X86_FEATURE_1_AND:
7241 /* Only one of APROP and BPROP can be NULL:
7242 1. APROP & BPROP when both APROP and BPROP aren't NULL.
7243 2. If APROP is NULL, remove x86 feature.
7244 3. Otherwise, do nothing.
7246 if (aprop != NULL && bprop != NULL)
7250 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
7252 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
7253 number = aprop->u.number;
7254 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
7255 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
7256 aprop->u.number = (number & bprop->u.number) | features;
7257 updated = number != (unsigned int) aprop->u.number;
7258 /* Remove the property if all feature bits are cleared. */
7259 if (aprop->u.number == 0)
7260 aprop->pr_kind = property_remove;
7266 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
7268 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
7271 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
7272 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
7275 number = aprop->u.number;
7276 aprop->u.number = number | features;
7277 updated = number != (unsigned int) aprop->u.number;
7281 bprop->u.number |= features;
7285 else if (aprop != NULL)
7287 aprop->pr_kind = property_remove;
7294 /* Never should happen. */
7301 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
7302 with GNU properties if found. Otherwise, return NULL. */
7305 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info)
7307 bfd_boolean normal_target;
7308 bfd_boolean lazy_plt;
7309 asection *sec, *pltsec;
7311 bfd_boolean use_ibt_plt;
7312 unsigned int plt_alignment, features;
7313 struct elf_x86_64_link_hash_table *htab;
7320 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
7322 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
7324 /* Find a normal input file with GNU property note. */
7325 for (pbfd = info->input_bfds;
7327 pbfd = pbfd->link.next)
7328 if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour
7329 && bfd_count_sections (pbfd) != 0)
7333 if (elf_properties (pbfd) != NULL)
7341 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
7342 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
7343 prop = _bfd_elf_get_property (ebfd,
7344 GNU_PROPERTY_X86_FEATURE_1_AND,
7346 prop->u.number |= features;
7347 prop->pr_kind = property_number;
7349 /* Create the GNU property note section if needed. */
7352 sec = bfd_make_section_with_flags (ebfd,
7353 NOTE_GNU_PROPERTY_SECTION_NAME,
7361 info->callbacks->einfo (_("%F: failed to create GNU property section\n"));
7363 if (!bfd_set_section_alignment (ebfd, sec,
7364 ABI_64_P (ebfd) ? 3 : 2))
7367 info->callbacks->einfo (_("%F%A: failed to align section\n"),
7371 elf_section_type (sec) = SHT_NOTE;
7375 /* Check GNU_PROPERTY_NO_COPY_ON_PROTECTED. */
7376 for (; pbfd != NULL; pbfd = pbfd->link.next)
7377 if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour
7379 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
7381 elf_property_list *p;
7383 /* The property list is sorted in order of type. */
7384 for (p = elf_properties (pbfd); p != NULL; p = p->next)
7386 if (GNU_PROPERTY_NO_COPY_ON_PROTECTED
7387 == p->property.pr_type)
7389 /* Clear extern_protected_data if
7390 GNU_PROPERTY_NO_COPY_ON_PROTECTED is
7391 set on any input relocatable file. */
7392 info->extern_protected_data = FALSE;
7395 else if (GNU_PROPERTY_NO_COPY_ON_PROTECTED
7396 < p->property.pr_type)
7402 pbfd = _bfd_elf_link_setup_gnu_properties (info);
7404 if (bfd_link_relocatable (info))
7407 htab = elf_x86_64_hash_table (info);
7411 use_ibt_plt = info->ibtplt || info->ibt;
7412 if (!use_ibt_plt && pbfd != NULL)
7414 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
7415 elf_property_list *p;
7417 /* The property list is sorted in order of type. */
7418 for (p = elf_properties (pbfd); p; p = p->next)
7420 if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type)
7422 use_ibt_plt = !!(p->property.u.number
7423 & GNU_PROPERTY_X86_FEATURE_1_IBT);
7426 else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type)
7431 dynobj = htab->elf.dynobj;
7433 /* Set htab->elf.dynobj here so that there is no need to check and
7434 set it in check_relocs. */
7439 htab->elf.dynobj = pbfd;
7446 /* Find a normal input file to hold linker created
7448 for (abfd = info->input_bfds;
7450 abfd = abfd->link.next)
7451 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7453 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
7455 htab->elf.dynobj = abfd;
7462 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
7463 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
7464 canonical function address. */
7465 htab->plt.has_plt0 = 1;
7467 if (get_elf_x86_64_backend_data (info->output_bfd)->os
7472 if (ABI_64_P (dynobj))
7474 htab->lazy_plt = &elf_x86_64_lazy_ibt_plt;
7475 htab->non_lazy_plt = &elf_x86_64_non_lazy_ibt_plt;
7479 htab->lazy_plt = &elf_x32_lazy_ibt_plt;
7480 htab->non_lazy_plt = &elf_x32_non_lazy_ibt_plt;
7483 else if (info->bndplt)
7485 htab->lazy_plt = &elf_x86_64_lazy_bnd_plt;
7486 htab->non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt;
7490 htab->lazy_plt = &elf_x86_64_lazy_plt;
7491 htab->non_lazy_plt = &elf_x86_64_non_lazy_plt;
7493 normal_target = TRUE;
7497 htab->lazy_plt = &elf_x86_64_nacl_plt;
7498 htab->non_lazy_plt = NULL;
7499 normal_target = FALSE;
7502 pltsec = htab->elf.splt;
7504 /* If the non-lazy PLT is available, use it for all PLT entries if
7505 there are no PLT0 or no .plt section. */
7506 if (htab->non_lazy_plt != NULL
7507 && (!htab->plt.has_plt0 || pltsec == NULL))
7511 = htab->non_lazy_plt->plt_entry;
7512 htab->plt.plt_entry_size
7513 = htab->non_lazy_plt->plt_entry_size;
7514 htab->plt.plt_got_offset
7515 = htab->non_lazy_plt->plt_got_offset;
7516 htab->plt.plt_got_insn_size
7517 = htab->non_lazy_plt->plt_got_insn_size;
7518 htab->plt.eh_frame_plt_size
7519 = htab->non_lazy_plt->eh_frame_plt_size;
7520 htab->plt.eh_frame_plt
7521 = htab->non_lazy_plt->eh_frame_plt;
7527 = htab->lazy_plt->plt_entry;
7528 htab->plt.plt_entry_size
7529 = htab->lazy_plt->plt_entry_size;
7530 htab->plt.plt_got_offset
7531 = htab->lazy_plt->plt_got_offset;
7532 htab->plt.plt_got_insn_size
7533 = htab->lazy_plt->plt_got_insn_size;
7534 htab->plt.eh_frame_plt_size
7535 = htab->lazy_plt->eh_frame_plt_size;
7536 htab->plt.eh_frame_plt
7537 = htab->lazy_plt->eh_frame_plt;
7540 /* Return if there are no normal input files. */
7544 /* Since create_dynamic_sections isn't always called, but GOT
7545 relocations need GOT relocations, create them here so that we
7546 don't need to do it in check_relocs. */
7547 if (htab->elf.sgot == NULL
7548 && !_bfd_elf_create_got_section (dynobj, info))
7549 info->callbacks->einfo (_("%F: failed to create GOT sections\n"));
7551 /* Align .got and .got.plt sections to their entry size. Do it here
7552 instead of in create_dynamic_sections so that they are always
7553 properly aligned even if create_dynamic_sections isn't called. */
7554 sec = htab->elf.sgot;
7555 if (!bfd_set_section_alignment (dynobj, sec, 3))
7556 goto error_alignment;
7558 sec = htab->elf.sgotplt;
7559 if (!bfd_set_section_alignment (dynobj, sec, 3))
7560 goto error_alignment;
7562 /* Create the ifunc sections here so that check_relocs can be
7564 if (!_bfd_elf_create_ifunc_sections (dynobj, info))
7565 info->callbacks->einfo (_("%F: failed to create ifunc sections\n"));
7567 plt_alignment = bfd_log2 (htab->plt.plt_entry_size);
7571 /* Whe creating executable, set the contents of the .interp
7572 section to the interpreter. */
7573 if (bfd_link_executable (info) && !info->nointerp)
7575 asection *s = bfd_get_linker_section (dynobj, ".interp");
7578 s->size = htab->dynamic_interpreter_size;
7579 s->contents = (unsigned char *) htab->dynamic_interpreter;
7583 /* Don't change PLT section alignment for NaCl since it uses
7584 64-byte PLT entry and sets PLT section alignment to 32
7585 bytes. Don't create additional PLT sections for NaCl. */
7588 const struct elf_backend_data *bed
7589 = get_elf_backend_data (dynobj);
7590 flagword pltflags = (bed->dynamic_sec_flags
7595 unsigned int non_lazy_plt_alignment
7596 = bfd_log2 (htab->non_lazy_plt->plt_entry_size);
7599 if (!bfd_set_section_alignment (sec->owner, sec,
7601 goto error_alignment;
7603 /* Create the GOT procedure linkage table. */
7604 sec = bfd_make_section_anyway_with_flags (dynobj,
7608 info->callbacks->einfo (_("%F: failed to create GOT PLT section\n"));
7610 if (!bfd_set_section_alignment (dynobj, sec,
7611 non_lazy_plt_alignment))
7612 goto error_alignment;
7614 htab->plt_got = sec;
7622 /* Create the second PLT for Intel IBT support. IBT
7623 PLT is supported only for non-NaCl target and is
7624 is needed only for lazy binding. */
7625 sec = bfd_make_section_anyway_with_flags (dynobj,
7629 info->callbacks->einfo (_("%F: failed to create IBT-enabled PLT section\n"));
7631 if (!bfd_set_section_alignment (dynobj, sec,
7633 goto error_alignment;
7635 else if (info->bndplt && ABI_64_P (dynobj))
7637 /* Create the second PLT for Intel MPX support. MPX
7638 PLT is supported only for non-NaCl target in 64-bit
7639 mode and is needed only for lazy binding. */
7640 sec = bfd_make_section_anyway_with_flags (dynobj,
7644 info->callbacks->einfo (_("%F: failed to create BND PLT section\n"));
7646 if (!bfd_set_section_alignment (dynobj, sec,
7647 non_lazy_plt_alignment))
7648 goto error_alignment;
7651 htab->plt_second = sec;
7655 if (!info->no_ld_generated_unwind_info)
7657 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
7658 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
7659 | SEC_LINKER_CREATED);
7661 sec = bfd_make_section_anyway_with_flags (dynobj,
7665 info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n"));
7667 if (!bfd_set_section_alignment (dynobj, sec,
7668 ABI_64_P (dynobj) ? 3 : 2))
7669 goto error_alignment;
7671 htab->plt_eh_frame = sec;
7673 if (htab->plt_got != NULL)
7675 sec = bfd_make_section_anyway_with_flags (dynobj,
7679 info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
7681 if (!bfd_set_section_alignment (dynobj, sec,
7682 ABI_64_P (dynobj) ? 3 : 2))
7683 goto error_alignment;
7685 htab->plt_got_eh_frame = sec;
7688 if (htab->plt_second != NULL)
7690 sec = bfd_make_section_anyway_with_flags (dynobj,
7694 info->callbacks->einfo (_("%F: failed to create BND PLT .eh_frame section\n"));
7696 if (!bfd_set_section_alignment (dynobj, sec, 3))
7697 goto error_alignment;
7699 htab->plt_second_eh_frame = sec;
7706 /* The .iplt section is used for IFUNC symbols in static
7708 sec = htab->elf.iplt;
7710 && !bfd_set_section_alignment (sec->owner, sec,
7712 goto error_alignment;
7719 elf_x86_64_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
7721 if (!bfd_link_relocatable (info))
7723 /* Check for __tls_get_addr reference. */
7724 struct elf_link_hash_entry *h;
7725 h = elf_link_hash_lookup (elf_hash_table (info), "__tls_get_addr",
7726 FALSE, FALSE, FALSE);
7728 ((struct elf_x86_64_link_hash_entry *) h)->tls_get_addr = 1;
7731 /* Invoke the regular ELF backend linker to do all the work. */
7732 return _bfd_elf_link_check_relocs (abfd, info);
7735 static const struct bfd_elf_special_section
7736 elf_x86_64_special_sections[]=
7738 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
7739 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
7740 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
7741 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
7742 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
7743 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
7744 { NULL, 0, 0, 0, 0 }
7747 #define TARGET_LITTLE_SYM x86_64_elf64_vec
7748 #define TARGET_LITTLE_NAME "elf64-x86-64"
7749 #define ELF_ARCH bfd_arch_i386
7750 #define ELF_TARGET_ID X86_64_ELF_DATA
7751 #define ELF_MACHINE_CODE EM_X86_64
7752 #define ELF_MAXPAGESIZE 0x200000
7753 #define ELF_MINPAGESIZE 0x1000
7754 #define ELF_COMMONPAGESIZE 0x1000
7756 #define elf_backend_can_gc_sections 1
7757 #define elf_backend_can_refcount 1
7758 #define elf_backend_want_got_plt 1
7759 #define elf_backend_plt_readonly 1
7760 #define elf_backend_want_plt_sym 0
7761 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
7762 #define elf_backend_rela_normal 1
7763 #define elf_backend_plt_alignment 4
7764 #define elf_backend_extern_protected_data 1
7765 #define elf_backend_caches_rawsize 1
7766 #define elf_backend_dtrel_excludes_plt 1
7767 #define elf_backend_want_dynrelro 1
7769 #define elf_info_to_howto elf_x86_64_info_to_howto
7771 #define bfd_elf64_bfd_link_hash_table_create \
7772 elf_x86_64_link_hash_table_create
7773 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
7774 #define bfd_elf64_bfd_reloc_name_lookup \
7775 elf_x86_64_reloc_name_lookup
7777 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
7778 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
7779 #define elf_backend_check_relocs elf_x86_64_check_relocs
7780 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
7781 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
7782 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
7783 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
7784 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
7785 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
7786 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
7787 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
7789 #define elf_backend_write_core_note elf_x86_64_write_core_note
7791 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
7792 #define elf_backend_relocate_section elf_x86_64_relocate_section
7793 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
7794 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
7795 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
7796 #define elf_backend_object_p elf64_x86_64_elf_object_p
7797 #define bfd_elf64_mkobject elf_x86_64_mkobject
7798 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
7799 #define bfd_elf64_bfd_link_check_relocs elf_x86_64_link_check_relocs
7801 #define elf_backend_section_from_shdr \
7802 elf_x86_64_section_from_shdr
7804 #define elf_backend_section_from_bfd_section \
7805 elf_x86_64_elf_section_from_bfd_section
7806 #define elf_backend_add_symbol_hook \
7807 elf_x86_64_add_symbol_hook
7808 #define elf_backend_symbol_processing \
7809 elf_x86_64_symbol_processing
7810 #define elf_backend_common_section_index \
7811 elf_x86_64_common_section_index
7812 #define elf_backend_common_section \
7813 elf_x86_64_common_section
7814 #define elf_backend_common_definition \
7815 elf_x86_64_common_definition
7816 #define elf_backend_merge_symbol \
7817 elf_x86_64_merge_symbol
7818 #define elf_backend_special_sections \
7819 elf_x86_64_special_sections
7820 #define elf_backend_additional_program_headers \
7821 elf_x86_64_additional_program_headers
7822 #define elf_backend_hash_symbol \
7823 elf_x86_64_hash_symbol
7824 #define elf_backend_omit_section_dynsym \
7825 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
7826 #define elf_backend_fixup_symbol \
7827 elf_x86_64_fixup_symbol
7828 #define elf_backend_parse_gnu_properties \
7829 elf_x86_64_parse_gnu_properties
7830 #define elf_backend_merge_gnu_properties \
7831 elf_x86_64_merge_gnu_properties
7832 #define elf_backend_setup_gnu_properties \
7833 elf_x86_64_link_setup_gnu_properties
7835 #include "elf64-target.h"
7837 /* CloudABI support. */
7839 #undef TARGET_LITTLE_SYM
7840 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
7841 #undef TARGET_LITTLE_NAME
7842 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
7845 #define ELF_OSABI ELFOSABI_CLOUDABI
7848 #define elf64_bed elf64_x86_64_cloudabi_bed
7850 #include "elf64-target.h"
7852 /* FreeBSD support. */
7854 #undef TARGET_LITTLE_SYM
7855 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
7856 #undef TARGET_LITTLE_NAME
7857 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
7860 #define ELF_OSABI ELFOSABI_FREEBSD
7863 #define elf64_bed elf64_x86_64_fbsd_bed
7865 #include "elf64-target.h"
7867 /* Solaris 2 support. */
7869 #undef TARGET_LITTLE_SYM
7870 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
7871 #undef TARGET_LITTLE_NAME
7872 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
7874 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
7875 objects won't be recognized. */
7879 #define elf64_bed elf64_x86_64_sol2_bed
7881 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
7883 #undef elf_backend_static_tls_alignment
7884 #define elf_backend_static_tls_alignment 16
7886 /* The Solaris 2 ABI requires a plt symbol on all platforms.
7888 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
7890 #undef elf_backend_want_plt_sym
7891 #define elf_backend_want_plt_sym 1
7893 #undef elf_backend_strtab_flags
7894 #define elf_backend_strtab_flags SHF_STRINGS
7897 elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
7898 bfd *obfd ATTRIBUTE_UNUSED,
7899 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
7900 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
7902 /* PR 19938: FIXME: Need to add code for setting the sh_info
7903 and sh_link fields of Solaris specific section types. */
7907 #undef elf_backend_copy_special_section_fields
7908 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
7910 #include "elf64-target.h"
7912 /* Native Client support. */
7915 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
7917 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
7918 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
7922 #undef TARGET_LITTLE_SYM
7923 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
7924 #undef TARGET_LITTLE_NAME
7925 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
7927 #define elf64_bed elf64_x86_64_nacl_bed
7929 #undef ELF_MAXPAGESIZE
7930 #undef ELF_MINPAGESIZE
7931 #undef ELF_COMMONPAGESIZE
7932 #define ELF_MAXPAGESIZE 0x10000
7933 #define ELF_MINPAGESIZE 0x10000
7934 #define ELF_COMMONPAGESIZE 0x10000
7936 /* Restore defaults. */
7938 #undef elf_backend_static_tls_alignment
7939 #undef elf_backend_want_plt_sym
7940 #define elf_backend_want_plt_sym 0
7941 #undef elf_backend_strtab_flags
7942 #undef elf_backend_copy_special_section_fields
7944 /* NaCl uses substantially different PLT entries for the same effects. */
7946 #undef elf_backend_plt_alignment
7947 #define elf_backend_plt_alignment 5
7948 #define NACL_PLT_ENTRY_SIZE 64
7949 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
7951 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
7953 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
7954 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
7955 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
7956 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7957 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7959 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
7960 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
7962 /* 32 bytes of nop to pad out to the standard size. */
7963 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7964 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7965 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7966 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7967 0x66, /* excess data16 prefix */
7971 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
7973 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
7974 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
7975 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7976 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7978 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
7979 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7980 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7982 /* Lazy GOT entries point here (32-byte aligned). */
7983 0x68, /* pushq immediate */
7984 0, 0, 0, 0, /* replaced with index into relocation table. */
7985 0xe9, /* jmp relative */
7986 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
7988 /* 22 bytes of nop to pad out to the standard size. */
7989 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7990 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7991 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
7994 /* .eh_frame covering the .plt section. */
7996 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
7998 #if (PLT_CIE_LENGTH != 20 \
7999 || PLT_FDE_LENGTH != 36 \
8000 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
8001 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
8002 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
8004 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
8005 0, 0, 0, 0, /* CIE ID */
8006 1, /* CIE version */
8007 'z', 'R', 0, /* Augmentation string */
8008 1, /* Code alignment factor */
8009 0x78, /* Data alignment factor */
8010 16, /* Return address column */
8011 1, /* Augmentation size */
8012 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
8013 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
8014 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
8015 DW_CFA_nop, DW_CFA_nop,
8017 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
8018 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
8019 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
8020 0, 0, 0, 0, /* .plt size goes here */
8021 0, /* Augmentation size */
8022 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
8023 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
8024 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
8025 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
8026 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
8027 13, /* Block length */
8028 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
8029 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
8030 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
8031 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
8032 DW_CFA_nop, DW_CFA_nop
8035 static const struct elf_x86_64_lazy_plt_layout elf_x86_64_nacl_plt =
8037 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
8038 elf_x86_64_nacl_plt_entry, /* plt_entry */
8039 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
8040 2, /* plt0_got1_offset */
8041 9, /* plt0_got2_offset */
8042 13, /* plt0_got2_insn_end */
8043 3, /* plt_got_offset */
8044 33, /* plt_reloc_offset */
8045 38, /* plt_plt_offset */
8046 7, /* plt_got_insn_size */
8047 42, /* plt_plt_insn_end */
8048 32, /* plt_lazy_offset */
8049 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
8050 sizeof (elf_x86_64_nacl_eh_frame_plt) /* eh_frame_plt_size */
8053 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
8058 #undef elf_backend_arch_data
8059 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
8061 #undef elf_backend_object_p
8062 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
8063 #undef elf_backend_modify_segment_map
8064 #define elf_backend_modify_segment_map nacl_modify_segment_map
8065 #undef elf_backend_modify_program_headers
8066 #define elf_backend_modify_program_headers nacl_modify_program_headers
8067 #undef elf_backend_final_write_processing
8068 #define elf_backend_final_write_processing nacl_final_write_processing
8070 #include "elf64-target.h"
8072 /* Native Client x32 support. */
8075 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
8077 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
8078 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
8082 #undef TARGET_LITTLE_SYM
8083 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
8084 #undef TARGET_LITTLE_NAME
8085 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
8087 #define elf32_bed elf32_x86_64_nacl_bed
8089 #define bfd_elf32_bfd_link_hash_table_create \
8090 elf_x86_64_link_hash_table_create
8091 #define bfd_elf32_bfd_reloc_type_lookup \
8092 elf_x86_64_reloc_type_lookup
8093 #define bfd_elf32_bfd_reloc_name_lookup \
8094 elf_x86_64_reloc_name_lookup
8095 #define bfd_elf32_mkobject \
8097 #define bfd_elf32_get_synthetic_symtab \
8098 elf_x86_64_get_synthetic_symtab
8099 #define bfd_elf32_bfd_link_check_relocs \
8100 elf_x86_64_link_check_relocs
8102 #undef elf_backend_object_p
8103 #define elf_backend_object_p \
8104 elf32_x86_64_nacl_elf_object_p
8106 #undef elf_backend_bfd_from_remote_memory
8107 #define elf_backend_bfd_from_remote_memory \
8108 _bfd_elf32_bfd_from_remote_memory
8110 #undef elf_backend_size_info
8111 #define elf_backend_size_info \
8112 _bfd_elf32_size_info
8114 #include "elf32-target.h"
8116 /* Restore defaults. */
8117 #undef elf_backend_object_p
8118 #define elf_backend_object_p elf64_x86_64_elf_object_p
8119 #undef elf_backend_bfd_from_remote_memory
8120 #undef elf_backend_size_info
8121 #undef elf_backend_modify_segment_map
8122 #undef elf_backend_modify_program_headers
8123 #undef elf_backend_final_write_processing
8125 /* Intel L1OM support. */
8128 elf64_l1om_elf_object_p (bfd *abfd)
8130 /* Set the right machine number for an L1OM elf64 file. */
8131 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
8135 #undef TARGET_LITTLE_SYM
8136 #define TARGET_LITTLE_SYM l1om_elf64_vec
8137 #undef TARGET_LITTLE_NAME
8138 #define TARGET_LITTLE_NAME "elf64-l1om"
8140 #define ELF_ARCH bfd_arch_l1om
8142 #undef ELF_MACHINE_CODE
8143 #define ELF_MACHINE_CODE EM_L1OM
8148 #define elf64_bed elf64_l1om_bed
8150 #undef elf_backend_object_p
8151 #define elf_backend_object_p elf64_l1om_elf_object_p
8153 /* Restore defaults. */
8154 #undef ELF_MAXPAGESIZE
8155 #undef ELF_MINPAGESIZE
8156 #undef ELF_COMMONPAGESIZE
8157 #define ELF_MAXPAGESIZE 0x200000
8158 #define ELF_MINPAGESIZE 0x1000
8159 #define ELF_COMMONPAGESIZE 0x1000
8160 #undef elf_backend_plt_alignment
8161 #define elf_backend_plt_alignment 4
8162 #undef elf_backend_arch_data
8163 #define elf_backend_arch_data &elf_x86_64_arch_bed
8165 #include "elf64-target.h"
8167 /* FreeBSD L1OM support. */
8169 #undef TARGET_LITTLE_SYM
8170 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
8171 #undef TARGET_LITTLE_NAME
8172 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
8175 #define ELF_OSABI ELFOSABI_FREEBSD
8178 #define elf64_bed elf64_l1om_fbsd_bed
8180 #include "elf64-target.h"
8182 /* Intel K1OM support. */
8185 elf64_k1om_elf_object_p (bfd *abfd)
8187 /* Set the right machine number for an K1OM elf64 file. */
8188 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
8192 #undef TARGET_LITTLE_SYM
8193 #define TARGET_LITTLE_SYM k1om_elf64_vec
8194 #undef TARGET_LITTLE_NAME
8195 #define TARGET_LITTLE_NAME "elf64-k1om"
8197 #define ELF_ARCH bfd_arch_k1om
8199 #undef ELF_MACHINE_CODE
8200 #define ELF_MACHINE_CODE EM_K1OM
8205 #define elf64_bed elf64_k1om_bed
8207 #undef elf_backend_object_p
8208 #define elf_backend_object_p elf64_k1om_elf_object_p
8210 #undef elf_backend_static_tls_alignment
8212 #undef elf_backend_want_plt_sym
8213 #define elf_backend_want_plt_sym 0
8215 #include "elf64-target.h"
8217 /* FreeBSD K1OM support. */
8219 #undef TARGET_LITTLE_SYM
8220 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
8221 #undef TARGET_LITTLE_NAME
8222 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
8225 #define ELF_OSABI ELFOSABI_FREEBSD
8228 #define elf64_bed elf64_k1om_fbsd_bed
8230 #include "elf64-target.h"
8232 /* 32bit x86-64 support. */
8234 #undef TARGET_LITTLE_SYM
8235 #define TARGET_LITTLE_SYM x86_64_elf32_vec
8236 #undef TARGET_LITTLE_NAME
8237 #define TARGET_LITTLE_NAME "elf32-x86-64"
8241 #define ELF_ARCH bfd_arch_i386
8243 #undef ELF_MACHINE_CODE
8244 #define ELF_MACHINE_CODE EM_X86_64
8248 #undef elf_backend_object_p
8249 #define elf_backend_object_p \
8250 elf32_x86_64_elf_object_p
8252 #undef elf_backend_bfd_from_remote_memory
8253 #define elf_backend_bfd_from_remote_memory \
8254 _bfd_elf32_bfd_from_remote_memory
8256 #undef elf_backend_size_info
8257 #define elf_backend_size_info \
8258 _bfd_elf32_size_info
8260 #include "elf32-target.h"