1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 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 "elf/x86-64.h"
41 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
42 #define MINUS_ONE (~ (bfd_vma) 0)
44 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
45 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
46 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
47 since they are the same. */
49 #define ABI_64_P(abfd) \
50 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52 /* The relocation "howto" table. Order of fields:
53 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
54 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
55 static reloc_howto_type x86_64_elf_howto_table[] =
57 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
60 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
63 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
64 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
67 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
69 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
70 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
72 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
78 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
81 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
84 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
85 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
87 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
88 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
90 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
91 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
93 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
95 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
97 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
99 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
100 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
101 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
104 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
107 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
110 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
113 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
114 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
116 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
117 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
119 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
120 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
122 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
125 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
128 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
130 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
131 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
133 FALSE, 0xffffffff, 0xffffffff, TRUE),
134 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
135 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
137 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
138 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
140 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
141 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
142 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
143 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
144 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
146 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
147 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
149 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
150 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
152 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
153 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
155 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
156 complain_overflow_bitfield, bfd_elf_generic_reloc,
157 "R_X86_64_GOTPC32_TLSDESC",
158 FALSE, 0xffffffff, 0xffffffff, TRUE),
159 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
160 complain_overflow_dont, bfd_elf_generic_reloc,
161 "R_X86_64_TLSDESC_CALL",
163 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
164 complain_overflow_bitfield, bfd_elf_generic_reloc,
166 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
167 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
168 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
170 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
173 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
174 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
176 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
177 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
180 /* We have a gap in the reloc numbers here.
181 R_X86_64_standard counts the number up to this point, and
182 R_X86_64_vt_offset is the value to subtract from a reloc type of
183 R_X86_64_GNU_VT* to form an index into this table. */
184 #define R_X86_64_standard (R_X86_64_PLT32_BND + 1)
185 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
187 /* GNU extension to record C++ vtable hierarchy. */
188 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
189 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
191 /* GNU extension to record C++ vtable member usage. */
192 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
193 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
196 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
197 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
198 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
202 #define IS_X86_64_PCREL_TYPE(TYPE) \
203 ( ((TYPE) == R_X86_64_PC8) \
204 || ((TYPE) == R_X86_64_PC16) \
205 || ((TYPE) == R_X86_64_PC32) \
206 || ((TYPE) == R_X86_64_PC32_BND) \
207 || ((TYPE) == R_X86_64_PC64))
209 /* Map BFD relocs to the x86_64 elf relocs. */
212 bfd_reloc_code_real_type bfd_reloc_val;
213 unsigned char elf_reloc_val;
216 static const struct elf_reloc_map x86_64_reloc_map[] =
218 { BFD_RELOC_NONE, R_X86_64_NONE, },
219 { BFD_RELOC_64, R_X86_64_64, },
220 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
221 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
222 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
223 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
224 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
225 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
226 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
227 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
228 { BFD_RELOC_32, R_X86_64_32, },
229 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
230 { BFD_RELOC_16, R_X86_64_16, },
231 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
232 { BFD_RELOC_8, R_X86_64_8, },
233 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
234 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
235 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
236 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
237 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
238 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
239 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
240 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
241 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
242 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
243 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
244 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
245 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
246 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
247 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
248 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
249 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
250 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
251 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
252 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
253 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
254 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
255 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
256 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND,},
257 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND,},
258 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
259 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
262 static reloc_howto_type *
263 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
267 if (r_type == (unsigned int) R_X86_64_32)
272 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
274 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
275 || r_type >= (unsigned int) R_X86_64_max)
277 if (r_type >= (unsigned int) R_X86_64_standard)
279 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
281 r_type = R_X86_64_NONE;
286 i = r_type - (unsigned int) R_X86_64_vt_offset;
287 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
288 return &x86_64_elf_howto_table[i];
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type *
293 elf_x86_64_reloc_type_lookup (bfd *abfd,
294 bfd_reloc_code_real_type code)
298 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
301 if (x86_64_reloc_map[i].bfd_reloc_val == code)
302 return elf_x86_64_rtype_to_howto (abfd,
303 x86_64_reloc_map[i].elf_reloc_val);
308 static reloc_howto_type *
309 elf_x86_64_reloc_name_lookup (bfd *abfd,
314 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type *reloc
318 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
319 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
323 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
324 if (x86_64_elf_howto_table[i].name != NULL
325 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
326 return &x86_64_elf_howto_table[i];
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
334 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
335 Elf_Internal_Rela *dst)
339 r_type = ELF32_R_TYPE (dst->r_info);
340 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
341 BFD_ASSERT (r_type == cache_ptr->howto->type);
344 /* Support for core dump NOTE sections. */
346 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
351 switch (note->descsz)
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
358 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
361 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
371 elf_tdata (abfd)->core->signal
372 = bfd_get_16 (abfd, note->descdata + 12);
375 elf_tdata (abfd)->core->lwpid
376 = bfd_get_32 (abfd, note->descdata + 32);
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
387 size, note->descpos + offset);
391 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
393 switch (note->descsz)
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd)->core->pid
400 = bfd_get_32 (abfd, note->descdata + 12);
401 elf_tdata (abfd)->core->program
402 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
403 elf_tdata (abfd)->core->command
404 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 24);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
421 char *command = elf_tdata (abfd)->core->command;
422 int n = strlen (command);
424 if (0 < n && command[n - 1] == ' ')
425 command[n - 1] = '\0';
433 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
436 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
438 const char *fname, *psargs;
449 va_start (ap, note_type);
450 fname = va_arg (ap, const char *);
451 psargs = va_arg (ap, const char *);
454 if (bed->s->elfclass == ELFCLASS32)
457 memset (&data, 0, sizeof (data));
458 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
459 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
460 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
461 &data, sizeof (data));
466 memset (&data, 0, sizeof (data));
467 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
468 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
469 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
470 &data, sizeof (data));
475 va_start (ap, note_type);
476 pid = va_arg (ap, long);
477 cursig = va_arg (ap, int);
478 gregs = va_arg (ap, const void *);
481 if (bed->s->elfclass == ELFCLASS32)
483 if (bed->elf_machine_code == EM_X86_64)
485 prstatusx32_t prstat;
486 memset (&prstat, 0, sizeof (prstat));
488 prstat.pr_cursig = cursig;
489 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
490 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
491 &prstat, sizeof (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));
507 memset (&prstat, 0, sizeof (prstat));
509 prstat.pr_cursig = cursig;
510 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
511 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
512 &prstat, sizeof (prstat));
519 /* Functions for the x86-64 ELF linker. */
521 /* The name of the dynamic interpreter. This is put in the .interp
524 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
525 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
527 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
528 copying dynamic variables from a shared lib into an app's dynbss
529 section, and instead use a dynamic relocation to point into the
531 #define ELIMINATE_COPY_RELOCS 1
533 /* The size in bytes of an entry in the global offset table. */
535 #define GOT_ENTRY_SIZE 8
537 /* The size in bytes of an entry in the procedure linkage table. */
539 #define PLT_ENTRY_SIZE 16
541 /* The first entry in a procedure linkage table looks like this. See the
542 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
544 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
546 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
547 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
548 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
551 /* Subsequent entries in a procedure linkage table look like this. */
553 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
555 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
556 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
557 0x68, /* pushq immediate */
558 0, 0, 0, 0, /* replaced with index into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
563 /* The first entry in a procedure linkage table with BND relocations
566 static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
568 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
569 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
570 0x0f, 0x1f, 0 /* nopl (%rax) */
573 /* Subsequent entries for legacy branches in a procedure linkage table
574 with BND relocations look like this. */
576 static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
578 0x68, 0, 0, 0, 0, /* pushq immediate */
579 0xe9, 0, 0, 0, 0, /* jmpq relative */
580 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
583 /* Subsequent entries for branches with BND prefx in a procedure linkage
584 table with BND relocations look like this. */
586 static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
590 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
593 /* Entries for legacy branches in the second procedure linkage table
596 static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
598 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
599 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* Entries for branches with BND prefix in the second procedure linkage
604 table look like this. */
606 static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
608 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
613 /* .eh_frame covering the .plt section. */
615 static const bfd_byte elf_x86_64_eh_frame_plt[] =
617 #define PLT_CIE_LENGTH 20
618 #define PLT_FDE_LENGTH 36
619 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
620 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
621 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
622 0, 0, 0, 0, /* CIE ID */
624 'z', 'R', 0, /* Augmentation string */
625 1, /* Code alignment factor */
626 0x78, /* Data alignment factor */
627 16, /* Return address column */
628 1, /* Augmentation size */
629 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
630 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
631 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
632 DW_CFA_nop, DW_CFA_nop,
634 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
635 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
636 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
637 0, 0, 0, 0, /* .plt size goes here */
638 0, /* Augmentation size */
639 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
640 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
641 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
642 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
643 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
644 11, /* Block length */
645 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
646 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
647 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
648 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
649 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
652 /* Architecture-specific backend data for x86-64. */
654 struct elf_x86_64_backend_data
656 /* Templates for the initial PLT entry and for subsequent entries. */
657 const bfd_byte *plt0_entry;
658 const bfd_byte *plt_entry;
659 unsigned int plt_entry_size; /* Size of each PLT entry. */
661 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
662 unsigned int plt0_got1_offset;
663 unsigned int plt0_got2_offset;
665 /* Offset of the end of the PC-relative instruction containing
667 unsigned int plt0_got2_insn_end;
669 /* Offsets into plt_entry that are to be replaced with... */
670 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
671 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
672 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
674 /* Length of the PC-relative instruction containing plt_got_offset. */
675 unsigned int plt_got_insn_size;
677 /* Offset of the end of the PC-relative jump to plt0_entry. */
678 unsigned int plt_plt_insn_end;
680 /* Offset into plt_entry where the initial value of the GOT entry points. */
681 unsigned int plt_lazy_offset;
683 /* .eh_frame covering the .plt section. */
684 const bfd_byte *eh_frame_plt;
685 unsigned int eh_frame_plt_size;
688 #define get_elf_x86_64_arch_data(bed) \
689 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
691 #define get_elf_x86_64_backend_data(abfd) \
692 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
694 #define GET_PLT_ENTRY_SIZE(abfd) \
695 get_elf_x86_64_backend_data (abfd)->plt_entry_size
697 /* These are the standard parameters. */
698 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
700 elf_x86_64_plt0_entry, /* plt0_entry */
701 elf_x86_64_plt_entry, /* plt_entry */
702 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
703 2, /* plt0_got1_offset */
704 8, /* plt0_got2_offset */
705 12, /* plt0_got2_insn_end */
706 2, /* plt_got_offset */
707 7, /* plt_reloc_offset */
708 12, /* plt_plt_offset */
709 6, /* plt_got_insn_size */
710 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
711 6, /* plt_lazy_offset */
712 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
713 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
716 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
718 elf_x86_64_bnd_plt0_entry, /* plt0_entry */
719 elf_x86_64_bnd_plt_entry, /* plt_entry */
720 sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
721 2, /* plt0_got1_offset */
722 1+8, /* plt0_got2_offset */
723 1+12, /* plt0_got2_insn_end */
724 1+2, /* plt_got_offset */
725 1, /* plt_reloc_offset */
726 7, /* plt_plt_offset */
727 1+6, /* plt_got_insn_size */
728 11, /* plt_plt_insn_end */
729 0, /* plt_lazy_offset */
730 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
731 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
734 #define elf_backend_arch_data &elf_x86_64_arch_bed
736 /* x86-64 ELF linker hash entry. */
738 struct elf_x86_64_link_hash_entry
740 struct elf_link_hash_entry elf;
742 /* Track dynamic relocs copied for this symbol. */
743 struct elf_dyn_relocs *dyn_relocs;
745 #define GOT_UNKNOWN 0
749 #define GOT_TLS_GDESC 4
750 #define GOT_TLS_GD_BOTH_P(type) \
751 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
752 #define GOT_TLS_GD_P(type) \
753 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
754 #define GOT_TLS_GDESC_P(type) \
755 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
756 #define GOT_TLS_GD_ANY_P(type) \
757 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
758 unsigned char tls_type;
760 /* TRUE if a weak symbol with a real definition needs a copy reloc.
761 When there is a weak symbol with a real definition, the processor
762 independent code will have arranged for us to see the real
763 definition first. We need to copy the needs_copy bit from the
764 real definition and check it when allowing copy reloc in PIE. */
765 unsigned int needs_copy : 1;
767 /* TRUE if symbol has at least one BND relocation. */
768 unsigned int has_bnd_reloc : 1;
770 /* Information about the GOT PLT entry. Filled when there are both
771 GOT and PLT relocations against the same function. */
772 union gotplt_union plt_got;
774 /* Information about the second PLT entry. Filled when has_bnd_reloc is
776 union gotplt_union plt_bnd;
778 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
779 starting at the end of the jump table. */
783 #define elf_x86_64_hash_entry(ent) \
784 ((struct elf_x86_64_link_hash_entry *)(ent))
786 struct elf_x86_64_obj_tdata
788 struct elf_obj_tdata root;
790 /* tls_type for each local got entry. */
791 char *local_got_tls_type;
793 /* GOTPLT entries for TLS descriptors. */
794 bfd_vma *local_tlsdesc_gotent;
797 #define elf_x86_64_tdata(abfd) \
798 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
800 #define elf_x86_64_local_got_tls_type(abfd) \
801 (elf_x86_64_tdata (abfd)->local_got_tls_type)
803 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
804 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
806 #define is_x86_64_elf(bfd) \
807 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
808 && elf_tdata (bfd) != NULL \
809 && elf_object_id (bfd) == X86_64_ELF_DATA)
812 elf_x86_64_mkobject (bfd *abfd)
814 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
818 /* x86-64 ELF linker hash table. */
820 struct elf_x86_64_link_hash_table
822 struct elf_link_hash_table elf;
824 /* Short-cuts to get to dynamic linker sections. */
827 asection *plt_eh_frame;
833 bfd_signed_vma refcount;
837 /* The amount of space used by the jump slots in the GOT. */
838 bfd_vma sgotplt_jump_table_size;
840 /* Small local sym cache. */
841 struct sym_cache sym_cache;
843 bfd_vma (*r_info) (bfd_vma, bfd_vma);
844 bfd_vma (*r_sym) (bfd_vma);
845 unsigned int pointer_r_type;
846 const char *dynamic_interpreter;
847 int dynamic_interpreter_size;
849 /* _TLS_MODULE_BASE_ symbol. */
850 struct bfd_link_hash_entry *tls_module_base;
852 /* Used by local STT_GNU_IFUNC symbols. */
853 htab_t loc_hash_table;
854 void * loc_hash_memory;
856 /* The offset into splt of the PLT entry for the TLS descriptor
857 resolver. Special values are 0, if not necessary (or not found
858 to be necessary yet), and -1 if needed but not determined
861 /* The offset into sgot of the GOT entry used by the PLT entry
865 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
866 bfd_vma next_jump_slot_index;
867 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
868 bfd_vma next_irelative_index;
871 /* Get the x86-64 ELF linker hash table from a link_info structure. */
873 #define elf_x86_64_hash_table(p) \
874 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
875 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
877 #define elf_x86_64_compute_jump_table_size(htab) \
878 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
880 /* Create an entry in an x86-64 ELF linker hash table. */
882 static struct bfd_hash_entry *
883 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
884 struct bfd_hash_table *table,
887 /* Allocate the structure if it has not already been allocated by a
891 entry = (struct bfd_hash_entry *)
892 bfd_hash_allocate (table,
893 sizeof (struct elf_x86_64_link_hash_entry));
898 /* Call the allocation method of the superclass. */
899 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
902 struct elf_x86_64_link_hash_entry *eh;
904 eh = (struct elf_x86_64_link_hash_entry *) entry;
905 eh->dyn_relocs = NULL;
906 eh->tls_type = GOT_UNKNOWN;
908 eh->has_bnd_reloc = 0;
909 eh->plt_bnd.offset = (bfd_vma) -1;
910 eh->plt_got.offset = (bfd_vma) -1;
911 eh->tlsdesc_got = (bfd_vma) -1;
917 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
918 for local symbol so that we can handle local STT_GNU_IFUNC symbols
919 as global symbol. We reuse indx and dynstr_index for local symbol
920 hash since they aren't used by global symbols in this backend. */
923 elf_x86_64_local_htab_hash (const void *ptr)
925 struct elf_link_hash_entry *h
926 = (struct elf_link_hash_entry *) ptr;
927 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
930 /* Compare local hash entries. */
933 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
935 struct elf_link_hash_entry *h1
936 = (struct elf_link_hash_entry *) ptr1;
937 struct elf_link_hash_entry *h2
938 = (struct elf_link_hash_entry *) ptr2;
940 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
943 /* Find and/or create a hash entry for local symbol. */
945 static struct elf_link_hash_entry *
946 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
947 bfd *abfd, const Elf_Internal_Rela *rel,
950 struct elf_x86_64_link_hash_entry e, *ret;
951 asection *sec = abfd->sections;
952 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
953 htab->r_sym (rel->r_info));
956 e.elf.indx = sec->id;
957 e.elf.dynstr_index = htab->r_sym (rel->r_info);
958 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
959 create ? INSERT : NO_INSERT);
966 ret = (struct elf_x86_64_link_hash_entry *) *slot;
970 ret = (struct elf_x86_64_link_hash_entry *)
971 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
972 sizeof (struct elf_x86_64_link_hash_entry));
975 memset (ret, 0, sizeof (*ret));
976 ret->elf.indx = sec->id;
977 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
978 ret->elf.dynindx = -1;
979 ret->plt_got.offset = (bfd_vma) -1;
985 /* Destroy an X86-64 ELF linker hash table. */
988 elf_x86_64_link_hash_table_free (bfd *obfd)
990 struct elf_x86_64_link_hash_table *htab
991 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
993 if (htab->loc_hash_table)
994 htab_delete (htab->loc_hash_table);
995 if (htab->loc_hash_memory)
996 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
997 _bfd_elf_link_hash_table_free (obfd);
1000 /* Create an X86-64 ELF linker hash table. */
1002 static struct bfd_link_hash_table *
1003 elf_x86_64_link_hash_table_create (bfd *abfd)
1005 struct elf_x86_64_link_hash_table *ret;
1006 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
1008 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
1012 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1013 elf_x86_64_link_hash_newfunc,
1014 sizeof (struct elf_x86_64_link_hash_entry),
1021 if (ABI_64_P (abfd))
1023 ret->r_info = elf64_r_info;
1024 ret->r_sym = elf64_r_sym;
1025 ret->pointer_r_type = R_X86_64_64;
1026 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1027 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1031 ret->r_info = elf32_r_info;
1032 ret->r_sym = elf32_r_sym;
1033 ret->pointer_r_type = R_X86_64_32;
1034 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1035 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1038 ret->loc_hash_table = htab_try_create (1024,
1039 elf_x86_64_local_htab_hash,
1040 elf_x86_64_local_htab_eq,
1042 ret->loc_hash_memory = objalloc_create ();
1043 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1045 elf_x86_64_link_hash_table_free (abfd);
1048 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1050 return &ret->elf.root;
1053 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1054 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1058 elf_x86_64_create_dynamic_sections (bfd *dynobj,
1059 struct bfd_link_info *info)
1061 struct elf_x86_64_link_hash_table *htab;
1063 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1066 htab = elf_x86_64_hash_table (info);
1070 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1074 if (info->executable)
1076 /* Always allow copy relocs for building executables. */
1077 asection *s = bfd_get_linker_section (dynobj, ".rela.bss");
1080 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1081 s = bfd_make_section_anyway_with_flags (dynobj,
1083 (bed->dynamic_sec_flags
1086 || ! bfd_set_section_alignment (dynobj, s,
1087 bed->s->log_file_align))
1093 if (!info->no_ld_generated_unwind_info
1094 && htab->plt_eh_frame == NULL
1095 && htab->elf.splt != NULL)
1097 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1098 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1099 | SEC_LINKER_CREATED);
1101 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1102 if (htab->plt_eh_frame == NULL
1103 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
1109 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1112 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1113 struct elf_link_hash_entry *dir,
1114 struct elf_link_hash_entry *ind)
1116 struct elf_x86_64_link_hash_entry *edir, *eind;
1118 edir = (struct elf_x86_64_link_hash_entry *) dir;
1119 eind = (struct elf_x86_64_link_hash_entry *) ind;
1121 if (!edir->has_bnd_reloc)
1122 edir->has_bnd_reloc = eind->has_bnd_reloc;
1124 if (eind->dyn_relocs != NULL)
1126 if (edir->dyn_relocs != NULL)
1128 struct elf_dyn_relocs **pp;
1129 struct elf_dyn_relocs *p;
1131 /* Add reloc counts against the indirect sym to the direct sym
1132 list. Merge any entries against the same section. */
1133 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1135 struct elf_dyn_relocs *q;
1137 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1138 if (q->sec == p->sec)
1140 q->pc_count += p->pc_count;
1141 q->count += p->count;
1148 *pp = edir->dyn_relocs;
1151 edir->dyn_relocs = eind->dyn_relocs;
1152 eind->dyn_relocs = NULL;
1155 if (ind->root.type == bfd_link_hash_indirect
1156 && dir->got.refcount <= 0)
1158 edir->tls_type = eind->tls_type;
1159 eind->tls_type = GOT_UNKNOWN;
1162 if (ELIMINATE_COPY_RELOCS
1163 && ind->root.type != bfd_link_hash_indirect
1164 && dir->dynamic_adjusted)
1166 /* If called to transfer flags for a weakdef during processing
1167 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1168 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1169 dir->ref_dynamic |= ind->ref_dynamic;
1170 dir->ref_regular |= ind->ref_regular;
1171 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1172 dir->needs_plt |= ind->needs_plt;
1173 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1176 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1180 elf64_x86_64_elf_object_p (bfd *abfd)
1182 /* Set the right machine number for an x86-64 elf64 file. */
1183 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1188 elf32_x86_64_elf_object_p (bfd *abfd)
1190 /* Set the right machine number for an x86-64 elf32 file. */
1191 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1195 /* Return TRUE if the TLS access code sequence support transition
1199 elf_x86_64_check_tls_transition (bfd *abfd,
1200 struct bfd_link_info *info,
1203 Elf_Internal_Shdr *symtab_hdr,
1204 struct elf_link_hash_entry **sym_hashes,
1205 unsigned int r_type,
1206 const Elf_Internal_Rela *rel,
1207 const Elf_Internal_Rela *relend)
1210 unsigned long r_symndx;
1211 bfd_boolean largepic = FALSE;
1212 struct elf_link_hash_entry *h;
1214 struct elf_x86_64_link_hash_table *htab;
1216 /* Get the section contents. */
1217 if (contents == NULL)
1219 if (elf_section_data (sec)->this_hdr.contents != NULL)
1220 contents = elf_section_data (sec)->this_hdr.contents;
1223 /* FIXME: How to better handle error condition? */
1224 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1227 /* Cache the section contents for elf_link_input_bfd. */
1228 elf_section_data (sec)->this_hdr.contents = contents;
1232 htab = elf_x86_64_hash_table (info);
1233 offset = rel->r_offset;
1236 case R_X86_64_TLSGD:
1237 case R_X86_64_TLSLD:
1238 if ((rel + 1) >= relend)
1241 if (r_type == R_X86_64_TLSGD)
1243 /* Check transition from GD access model. For 64bit, only
1244 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1245 .word 0x6666; rex64; call __tls_get_addr
1246 can transit to different access model. For 32bit, only
1247 leaq foo@tlsgd(%rip), %rdi
1248 .word 0x6666; rex64; call __tls_get_addr
1249 can transit to different access model. For largepic
1251 leaq foo@tlsgd(%rip), %rdi
1252 movabsq $__tls_get_addr@pltoff, %rax
1256 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1257 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1259 if ((offset + 12) > sec->size)
1262 if (memcmp (contents + offset + 4, call, 4) != 0)
1264 if (!ABI_64_P (abfd)
1265 || (offset + 19) > sec->size
1267 || memcmp (contents + offset - 3, leaq + 1, 3) != 0
1268 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1269 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1274 else if (ABI_64_P (abfd))
1277 || memcmp (contents + offset - 4, leaq, 4) != 0)
1283 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1289 /* Check transition from LD access model. Only
1290 leaq foo@tlsld(%rip), %rdi;
1292 can transit to different access model. For largepic
1294 leaq foo@tlsld(%rip), %rdi
1295 movabsq $__tls_get_addr@pltoff, %rax
1299 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1301 if (offset < 3 || (offset + 9) > sec->size)
1304 if (memcmp (contents + offset - 3, lea, 3) != 0)
1307 if (0xe8 != *(contents + offset + 4))
1309 if (!ABI_64_P (abfd)
1310 || (offset + 19) > sec->size
1311 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1312 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1319 r_symndx = htab->r_sym (rel[1].r_info);
1320 if (r_symndx < symtab_hdr->sh_info)
1323 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1324 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1325 may be versioned. */
1327 && h->root.root.string != NULL
1329 ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64
1330 : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1331 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32))
1332 && (strncmp (h->root.root.string,
1333 "__tls_get_addr", 14) == 0));
1335 case R_X86_64_GOTTPOFF:
1336 /* Check transition from IE access model:
1337 mov foo@gottpoff(%rip), %reg
1338 add foo@gottpoff(%rip), %reg
1341 /* Check REX prefix first. */
1342 if (offset >= 3 && (offset + 4) <= sec->size)
1344 val = bfd_get_8 (abfd, contents + offset - 3);
1345 if (val != 0x48 && val != 0x4c)
1347 /* X32 may have 0x44 REX prefix or no REX prefix. */
1348 if (ABI_64_P (abfd))
1354 /* X32 may not have any REX prefix. */
1355 if (ABI_64_P (abfd))
1357 if (offset < 2 || (offset + 3) > sec->size)
1361 val = bfd_get_8 (abfd, contents + offset - 2);
1362 if (val != 0x8b && val != 0x03)
1365 val = bfd_get_8 (abfd, contents + offset - 1);
1366 return (val & 0xc7) == 5;
1368 case R_X86_64_GOTPC32_TLSDESC:
1369 /* Check transition from GDesc access model:
1370 leaq x@tlsdesc(%rip), %rax
1372 Make sure it's a leaq adding rip to a 32-bit offset
1373 into any register, although it's probably almost always
1376 if (offset < 3 || (offset + 4) > sec->size)
1379 val = bfd_get_8 (abfd, contents + offset - 3);
1380 if ((val & 0xfb) != 0x48)
1383 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1386 val = bfd_get_8 (abfd, contents + offset - 1);
1387 return (val & 0xc7) == 0x05;
1389 case R_X86_64_TLSDESC_CALL:
1390 /* Check transition from GDesc access model:
1391 call *x@tlsdesc(%rax)
1393 if (offset + 2 <= sec->size)
1395 /* Make sure that it's a call *x@tlsdesc(%rax). */
1396 static const unsigned char call[] = { 0xff, 0x10 };
1397 return memcmp (contents + offset, call, 2) == 0;
1407 /* Return TRUE if the TLS access transition is OK or no transition
1408 will be performed. Update R_TYPE if there is a transition. */
1411 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1412 asection *sec, bfd_byte *contents,
1413 Elf_Internal_Shdr *symtab_hdr,
1414 struct elf_link_hash_entry **sym_hashes,
1415 unsigned int *r_type, int tls_type,
1416 const Elf_Internal_Rela *rel,
1417 const Elf_Internal_Rela *relend,
1418 struct elf_link_hash_entry *h,
1419 unsigned long r_symndx)
1421 unsigned int from_type = *r_type;
1422 unsigned int to_type = from_type;
1423 bfd_boolean check = TRUE;
1425 /* Skip TLS transition for functions. */
1427 && (h->type == STT_FUNC
1428 || h->type == STT_GNU_IFUNC))
1433 case R_X86_64_TLSGD:
1434 case R_X86_64_GOTPC32_TLSDESC:
1435 case R_X86_64_TLSDESC_CALL:
1436 case R_X86_64_GOTTPOFF:
1437 if (info->executable)
1440 to_type = R_X86_64_TPOFF32;
1442 to_type = R_X86_64_GOTTPOFF;
1445 /* When we are called from elf_x86_64_relocate_section,
1446 CONTENTS isn't NULL and there may be additional transitions
1447 based on TLS_TYPE. */
1448 if (contents != NULL)
1450 unsigned int new_to_type = to_type;
1452 if (info->executable
1455 && tls_type == GOT_TLS_IE)
1456 new_to_type = R_X86_64_TPOFF32;
1458 if (to_type == R_X86_64_TLSGD
1459 || to_type == R_X86_64_GOTPC32_TLSDESC
1460 || to_type == R_X86_64_TLSDESC_CALL)
1462 if (tls_type == GOT_TLS_IE)
1463 new_to_type = R_X86_64_GOTTPOFF;
1466 /* We checked the transition before when we were called from
1467 elf_x86_64_check_relocs. We only want to check the new
1468 transition which hasn't been checked before. */
1469 check = new_to_type != to_type && from_type == to_type;
1470 to_type = new_to_type;
1475 case R_X86_64_TLSLD:
1476 if (info->executable)
1477 to_type = R_X86_64_TPOFF32;
1484 /* Return TRUE if there is no transition. */
1485 if (from_type == to_type)
1488 /* Check if the transition can be performed. */
1490 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1491 symtab_hdr, sym_hashes,
1492 from_type, rel, relend))
1494 reloc_howto_type *from, *to;
1497 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1498 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1501 name = h->root.root.string;
1504 struct elf_x86_64_link_hash_table *htab;
1506 htab = elf_x86_64_hash_table (info);
1511 Elf_Internal_Sym *isym;
1513 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1515 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1519 (*_bfd_error_handler)
1520 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1521 "in section `%A' failed"),
1522 abfd, sec, from->name, to->name, name,
1523 (unsigned long) rel->r_offset);
1524 bfd_set_error (bfd_error_bad_value);
1532 /* Look through the relocs for a section during the first phase, and
1533 calculate needed space in the global offset table, procedure
1534 linkage table, and dynamic reloc sections. */
1537 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1539 const Elf_Internal_Rela *relocs)
1541 struct elf_x86_64_link_hash_table *htab;
1542 Elf_Internal_Shdr *symtab_hdr;
1543 struct elf_link_hash_entry **sym_hashes;
1544 const Elf_Internal_Rela *rel;
1545 const Elf_Internal_Rela *rel_end;
1547 bfd_boolean use_plt_got;
1549 if (info->relocatable)
1552 BFD_ASSERT (is_x86_64_elf (abfd));
1554 htab = elf_x86_64_hash_table (info);
1558 use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
1560 symtab_hdr = &elf_symtab_hdr (abfd);
1561 sym_hashes = elf_sym_hashes (abfd);
1565 rel_end = relocs + sec->reloc_count;
1566 for (rel = relocs; rel < rel_end; rel++)
1568 unsigned int r_type;
1569 unsigned long r_symndx;
1570 struct elf_link_hash_entry *h;
1571 Elf_Internal_Sym *isym;
1573 bfd_boolean size_reloc;
1575 r_symndx = htab->r_sym (rel->r_info);
1576 r_type = ELF32_R_TYPE (rel->r_info);
1578 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1580 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1585 if (r_symndx < symtab_hdr->sh_info)
1587 /* A local symbol. */
1588 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1593 /* Check relocation against local STT_GNU_IFUNC symbol. */
1594 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1596 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1601 /* Fake a STT_GNU_IFUNC symbol. */
1602 h->type = STT_GNU_IFUNC;
1605 h->forced_local = 1;
1606 h->root.type = bfd_link_hash_defined;
1614 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1615 while (h->root.type == bfd_link_hash_indirect
1616 || h->root.type == bfd_link_hash_warning)
1617 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1620 /* Check invalid x32 relocations. */
1621 if (!ABI_64_P (abfd))
1627 case R_X86_64_DTPOFF64:
1628 case R_X86_64_TPOFF64:
1630 case R_X86_64_GOTOFF64:
1631 case R_X86_64_GOT64:
1632 case R_X86_64_GOTPCREL64:
1633 case R_X86_64_GOTPC64:
1634 case R_X86_64_GOTPLT64:
1635 case R_X86_64_PLTOFF64:
1638 name = h->root.root.string;
1640 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1642 (*_bfd_error_handler)
1643 (_("%B: relocation %s against symbol `%s' isn't "
1644 "supported in x32 mode"), abfd,
1645 x86_64_elf_howto_table[r_type].name, name);
1646 bfd_set_error (bfd_error_bad_value);
1654 /* Create the ifunc sections for static executables. If we
1655 never see an indirect function symbol nor we are building
1656 a static executable, those sections will be empty and
1657 won't appear in output. */
1663 case R_X86_64_PC32_BND:
1664 case R_X86_64_PLT32_BND:
1666 case R_X86_64_PLT32:
1669 /* MPX PLT is supported only if elf_x86_64_arch_bed
1670 is used in 64-bit mode. */
1673 && (get_elf_x86_64_backend_data (abfd)
1674 == &elf_x86_64_arch_bed))
1676 elf_x86_64_hash_entry (h)->has_bnd_reloc = 1;
1678 /* Create the second PLT for Intel MPX support. */
1679 if (htab->plt_bnd == NULL)
1681 unsigned int plt_bnd_align;
1682 const struct elf_backend_data *bed;
1684 bed = get_elf_backend_data (info->output_bfd);
1685 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) == 8
1686 && (sizeof (elf_x86_64_bnd_plt2_entry)
1687 == sizeof (elf_x86_64_legacy_plt2_entry)));
1690 if (htab->elf.dynobj == NULL)
1691 htab->elf.dynobj = abfd;
1693 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1695 (bed->dynamic_sec_flags
1700 if (htab->plt_bnd == NULL
1701 || !bfd_set_section_alignment (htab->elf.dynobj,
1710 case R_X86_64_GOTPCREL:
1711 case R_X86_64_GOTPCREL64:
1712 if (htab->elf.dynobj == NULL)
1713 htab->elf.dynobj = abfd;
1714 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1719 /* It is referenced by a non-shared object. */
1721 h->root.non_ir_ref = 1;
1724 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1725 symtab_hdr, sym_hashes,
1726 &r_type, GOT_UNKNOWN,
1727 rel, rel_end, h, r_symndx))
1732 case R_X86_64_TLSLD:
1733 htab->tls_ld_got.refcount += 1;
1736 case R_X86_64_TPOFF32:
1737 if (!info->executable && ABI_64_P (abfd))
1740 name = h->root.root.string;
1742 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1744 (*_bfd_error_handler)
1745 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1747 x86_64_elf_howto_table[r_type].name, name);
1748 bfd_set_error (bfd_error_bad_value);
1753 case R_X86_64_GOTTPOFF:
1754 if (!info->executable)
1755 info->flags |= DF_STATIC_TLS;
1758 case R_X86_64_GOT32:
1759 case R_X86_64_GOTPCREL:
1760 case R_X86_64_TLSGD:
1761 case R_X86_64_GOT64:
1762 case R_X86_64_GOTPCREL64:
1763 case R_X86_64_GOTPLT64:
1764 case R_X86_64_GOTPC32_TLSDESC:
1765 case R_X86_64_TLSDESC_CALL:
1766 /* This symbol requires a global offset table entry. */
1768 int tls_type, old_tls_type;
1772 default: tls_type = GOT_NORMAL; break;
1773 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1774 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1775 case R_X86_64_GOTPC32_TLSDESC:
1776 case R_X86_64_TLSDESC_CALL:
1777 tls_type = GOT_TLS_GDESC; break;
1782 h->got.refcount += 1;
1783 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1787 bfd_signed_vma *local_got_refcounts;
1789 /* This is a global offset table entry for a local symbol. */
1790 local_got_refcounts = elf_local_got_refcounts (abfd);
1791 if (local_got_refcounts == NULL)
1795 size = symtab_hdr->sh_info;
1796 size *= sizeof (bfd_signed_vma)
1797 + sizeof (bfd_vma) + sizeof (char);
1798 local_got_refcounts = ((bfd_signed_vma *)
1799 bfd_zalloc (abfd, size));
1800 if (local_got_refcounts == NULL)
1802 elf_local_got_refcounts (abfd) = local_got_refcounts;
1803 elf_x86_64_local_tlsdesc_gotent (abfd)
1804 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1805 elf_x86_64_local_got_tls_type (abfd)
1806 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1808 local_got_refcounts[r_symndx] += 1;
1810 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1813 /* If a TLS symbol is accessed using IE at least once,
1814 there is no point to use dynamic model for it. */
1815 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1816 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1817 || tls_type != GOT_TLS_IE))
1819 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1820 tls_type = old_tls_type;
1821 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1822 && GOT_TLS_GD_ANY_P (tls_type))
1823 tls_type |= old_tls_type;
1827 name = h->root.root.string;
1829 name = bfd_elf_sym_name (abfd, symtab_hdr,
1831 (*_bfd_error_handler)
1832 (_("%B: '%s' accessed both as normal and thread local symbol"),
1834 bfd_set_error (bfd_error_bad_value);
1839 if (old_tls_type != tls_type)
1842 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1844 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1849 case R_X86_64_GOTOFF64:
1850 case R_X86_64_GOTPC32:
1851 case R_X86_64_GOTPC64:
1853 if (htab->elf.sgot == NULL)
1855 if (htab->elf.dynobj == NULL)
1856 htab->elf.dynobj = abfd;
1857 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1863 case R_X86_64_PLT32:
1864 case R_X86_64_PLT32_BND:
1865 /* This symbol requires a procedure linkage table entry. We
1866 actually build the entry in adjust_dynamic_symbol,
1867 because this might be a case of linking PIC code which is
1868 never referenced by a dynamic object, in which case we
1869 don't need to generate a procedure linkage table entry
1872 /* If this is a local symbol, we resolve it directly without
1873 creating a procedure linkage table entry. */
1878 h->plt.refcount += 1;
1881 case R_X86_64_PLTOFF64:
1882 /* This tries to form the 'address' of a function relative
1883 to GOT. For global symbols we need a PLT entry. */
1887 h->plt.refcount += 1;
1891 case R_X86_64_SIZE32:
1892 case R_X86_64_SIZE64:
1897 if (!ABI_64_P (abfd))
1902 /* Let's help debug shared library creation. These relocs
1903 cannot be used in shared libs. Don't error out for
1904 sections we don't care about, such as debug sections or
1905 non-constant sections. */
1907 && (sec->flags & SEC_ALLOC) != 0
1908 && (sec->flags & SEC_READONLY) != 0)
1911 name = h->root.root.string;
1913 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1914 (*_bfd_error_handler)
1915 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1916 abfd, x86_64_elf_howto_table[r_type].name, name);
1917 bfd_set_error (bfd_error_bad_value);
1925 case R_X86_64_PC32_BND:
1929 if (h != NULL && info->executable)
1931 /* If this reloc is in a read-only section, we might
1932 need a copy reloc. We can't check reliably at this
1933 stage whether the section is read-only, as input
1934 sections have not yet been mapped to output sections.
1935 Tentatively set the flag for now, and correct in
1936 adjust_dynamic_symbol. */
1939 /* We may need a .plt entry if the function this reloc
1940 refers to is in a shared lib. */
1941 h->plt.refcount += 1;
1942 if (r_type != R_X86_64_PC32
1943 && r_type != R_X86_64_PC32_BND
1944 && r_type != R_X86_64_PC64)
1945 h->pointer_equality_needed = 1;
1950 /* If we are creating a shared library, and this is a reloc
1951 against a global symbol, or a non PC relative reloc
1952 against a local symbol, then we need to copy the reloc
1953 into the shared library. However, if we are linking with
1954 -Bsymbolic, we do not need to copy a reloc against a
1955 global symbol which is defined in an object we are
1956 including in the link (i.e., DEF_REGULAR is set). At
1957 this point we have not seen all the input files, so it is
1958 possible that DEF_REGULAR is not set now but will be set
1959 later (it is never cleared). In case of a weak definition,
1960 DEF_REGULAR may be cleared later by a strong definition in
1961 a shared library. We account for that possibility below by
1962 storing information in the relocs_copied field of the hash
1963 table entry. A similar situation occurs when creating
1964 shared libraries and symbol visibility changes render the
1967 If on the other hand, we are creating an executable, we
1968 may need to keep relocations for symbols satisfied by a
1969 dynamic library if we manage to avoid copy relocs for the
1972 && (sec->flags & SEC_ALLOC) != 0
1973 && (! IS_X86_64_PCREL_TYPE (r_type)
1975 && (! SYMBOLIC_BIND (info, h)
1976 || h->root.type == bfd_link_hash_defweak
1977 || !h->def_regular))))
1978 || (ELIMINATE_COPY_RELOCS
1980 && (sec->flags & SEC_ALLOC) != 0
1982 && (h->root.type == bfd_link_hash_defweak
1983 || !h->def_regular)))
1985 struct elf_dyn_relocs *p;
1986 struct elf_dyn_relocs **head;
1988 /* We must copy these reloc types into the output file.
1989 Create a reloc section in dynobj and make room for
1993 if (htab->elf.dynobj == NULL)
1994 htab->elf.dynobj = abfd;
1996 sreloc = _bfd_elf_make_dynamic_reloc_section
1997 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1998 abfd, /*rela?*/ TRUE);
2004 /* If this is a global symbol, we count the number of
2005 relocations we need for this symbol. */
2008 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
2012 /* Track dynamic relocs needed for local syms too.
2013 We really need local syms available to do this
2018 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2023 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2027 /* Beware of type punned pointers vs strict aliasing
2029 vpp = &(elf_section_data (s)->local_dynrel);
2030 head = (struct elf_dyn_relocs **)vpp;
2034 if (p == NULL || p->sec != sec)
2036 bfd_size_type amt = sizeof *p;
2038 p = ((struct elf_dyn_relocs *)
2039 bfd_alloc (htab->elf.dynobj, amt));
2050 /* Count size relocation as PC-relative relocation. */
2051 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2056 /* This relocation describes the C++ object vtable hierarchy.
2057 Reconstruct it for later use during GC. */
2058 case R_X86_64_GNU_VTINHERIT:
2059 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2063 /* This relocation describes which C++ vtable entries are actually
2064 used. Record for later use during GC. */
2065 case R_X86_64_GNU_VTENTRY:
2066 BFD_ASSERT (h != NULL);
2068 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2078 && h->plt.refcount > 0
2079 && h->got.refcount > 0
2080 && htab->plt_got == NULL)
2082 /* Create the GOT procedure linkage table. */
2083 unsigned int plt_got_align;
2084 const struct elf_backend_data *bed;
2086 bed = get_elf_backend_data (info->output_bfd);
2087 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry) == 8
2088 && (sizeof (elf_x86_64_bnd_plt2_entry)
2089 == sizeof (elf_x86_64_legacy_plt2_entry)));
2092 if (htab->elf.dynobj == NULL)
2093 htab->elf.dynobj = abfd;
2095 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2097 (bed->dynamic_sec_flags
2102 if (htab->plt_got == NULL
2103 || !bfd_set_section_alignment (htab->elf.dynobj,
2113 /* Return the section that should be marked against GC for a given
2117 elf_x86_64_gc_mark_hook (asection *sec,
2118 struct bfd_link_info *info,
2119 Elf_Internal_Rela *rel,
2120 struct elf_link_hash_entry *h,
2121 Elf_Internal_Sym *sym)
2124 switch (ELF32_R_TYPE (rel->r_info))
2126 case R_X86_64_GNU_VTINHERIT:
2127 case R_X86_64_GNU_VTENTRY:
2131 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2134 /* Update the got entry reference counts for the section being removed. */
2137 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
2139 const Elf_Internal_Rela *relocs)
2141 struct elf_x86_64_link_hash_table *htab;
2142 Elf_Internal_Shdr *symtab_hdr;
2143 struct elf_link_hash_entry **sym_hashes;
2144 bfd_signed_vma *local_got_refcounts;
2145 const Elf_Internal_Rela *rel, *relend;
2147 if (info->relocatable)
2150 htab = elf_x86_64_hash_table (info);
2154 elf_section_data (sec)->local_dynrel = NULL;
2156 symtab_hdr = &elf_symtab_hdr (abfd);
2157 sym_hashes = elf_sym_hashes (abfd);
2158 local_got_refcounts = elf_local_got_refcounts (abfd);
2160 htab = elf_x86_64_hash_table (info);
2161 relend = relocs + sec->reloc_count;
2162 for (rel = relocs; rel < relend; rel++)
2164 unsigned long r_symndx;
2165 unsigned int r_type;
2166 struct elf_link_hash_entry *h = NULL;
2168 r_symndx = htab->r_sym (rel->r_info);
2169 if (r_symndx >= symtab_hdr->sh_info)
2171 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2172 while (h->root.type == bfd_link_hash_indirect
2173 || h->root.type == bfd_link_hash_warning)
2174 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2178 /* A local symbol. */
2179 Elf_Internal_Sym *isym;
2181 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2184 /* Check relocation against local STT_GNU_IFUNC symbol. */
2186 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2188 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2196 struct elf_x86_64_link_hash_entry *eh;
2197 struct elf_dyn_relocs **pp;
2198 struct elf_dyn_relocs *p;
2200 eh = (struct elf_x86_64_link_hash_entry *) h;
2202 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2205 /* Everything must go for SEC. */
2211 r_type = ELF32_R_TYPE (rel->r_info);
2212 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2213 symtab_hdr, sym_hashes,
2214 &r_type, GOT_UNKNOWN,
2215 rel, relend, h, r_symndx))
2220 case R_X86_64_TLSLD:
2221 if (htab->tls_ld_got.refcount > 0)
2222 htab->tls_ld_got.refcount -= 1;
2225 case R_X86_64_TLSGD:
2226 case R_X86_64_GOTPC32_TLSDESC:
2227 case R_X86_64_TLSDESC_CALL:
2228 case R_X86_64_GOTTPOFF:
2229 case R_X86_64_GOT32:
2230 case R_X86_64_GOTPCREL:
2231 case R_X86_64_GOT64:
2232 case R_X86_64_GOTPCREL64:
2233 case R_X86_64_GOTPLT64:
2236 if (h->got.refcount > 0)
2237 h->got.refcount -= 1;
2238 if (h->type == STT_GNU_IFUNC)
2240 if (h->plt.refcount > 0)
2241 h->plt.refcount -= 1;
2244 else if (local_got_refcounts != NULL)
2246 if (local_got_refcounts[r_symndx] > 0)
2247 local_got_refcounts[r_symndx] -= 1;
2259 case R_X86_64_PC32_BND:
2261 case R_X86_64_SIZE32:
2262 case R_X86_64_SIZE64:
2264 && (h == NULL || h->type != STT_GNU_IFUNC))
2268 case R_X86_64_PLT32:
2269 case R_X86_64_PLT32_BND:
2270 case R_X86_64_PLTOFF64:
2273 if (h->plt.refcount > 0)
2274 h->plt.refcount -= 1;
2286 /* Adjust a symbol defined by a dynamic object and referenced by a
2287 regular object. The current definition is in some section of the
2288 dynamic object, but we're not including those sections. We have to
2289 change the definition to something the rest of the link can
2293 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2294 struct elf_link_hash_entry *h)
2296 struct elf_x86_64_link_hash_table *htab;
2298 struct elf_x86_64_link_hash_entry *eh;
2299 struct elf_dyn_relocs *p;
2301 /* STT_GNU_IFUNC symbol must go through PLT. */
2302 if (h->type == STT_GNU_IFUNC)
2304 /* All local STT_GNU_IFUNC references must be treate as local
2305 calls via local PLT. */
2307 && SYMBOL_CALLS_LOCAL (info, h))
2309 bfd_size_type pc_count = 0, count = 0;
2310 struct elf_dyn_relocs **pp;
2312 eh = (struct elf_x86_64_link_hash_entry *) h;
2313 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2315 pc_count += p->pc_count;
2316 p->count -= p->pc_count;
2325 if (pc_count || count)
2329 if (h->plt.refcount <= 0)
2330 h->plt.refcount = 1;
2332 h->plt.refcount += 1;
2336 if (h->plt.refcount <= 0)
2338 h->plt.offset = (bfd_vma) -1;
2344 /* If this is a function, put it in the procedure linkage table. We
2345 will fill in the contents of the procedure linkage table later,
2346 when we know the address of the .got section. */
2347 if (h->type == STT_FUNC
2350 if (h->plt.refcount <= 0
2351 || SYMBOL_CALLS_LOCAL (info, h)
2352 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2353 && h->root.type == bfd_link_hash_undefweak))
2355 /* This case can occur if we saw a PLT32 reloc in an input
2356 file, but the symbol was never referred to by a dynamic
2357 object, or if all references were garbage collected. In
2358 such a case, we don't actually need to build a procedure
2359 linkage table, and we can just do a PC32 reloc instead. */
2360 h->plt.offset = (bfd_vma) -1;
2367 /* It's possible that we incorrectly decided a .plt reloc was
2368 needed for an R_X86_64_PC32 reloc to a non-function sym in
2369 check_relocs. We can't decide accurately between function and
2370 non-function syms in check-relocs; Objects loaded later in
2371 the link may change h->type. So fix it now. */
2372 h->plt.offset = (bfd_vma) -1;
2374 /* If this is a weak symbol, and there is a real definition, the
2375 processor independent code will have arranged for us to see the
2376 real definition first, and we can just use the same value. */
2377 if (h->u.weakdef != NULL)
2379 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2380 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2381 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2382 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2383 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2385 eh = (struct elf_x86_64_link_hash_entry *) h;
2386 h->non_got_ref = h->u.weakdef->non_got_ref;
2387 eh->needs_copy = h->u.weakdef->needs_copy;
2392 /* This is a reference to a symbol defined by a dynamic object which
2393 is not a function. */
2395 /* If we are creating a shared library, we must presume that the
2396 only references to the symbol are via the global offset table.
2397 For such cases we need not do anything here; the relocations will
2398 be handled correctly by relocate_section. */
2399 if (!info->executable)
2402 /* If there are no references to this symbol that do not use the
2403 GOT, we don't need to generate a copy reloc. */
2404 if (!h->non_got_ref)
2407 /* If -z nocopyreloc was given, we won't generate them either. */
2408 if (info->nocopyreloc)
2414 if (ELIMINATE_COPY_RELOCS)
2416 eh = (struct elf_x86_64_link_hash_entry *) h;
2417 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2419 s = p->sec->output_section;
2420 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2424 /* If we didn't find any dynamic relocs in read-only sections, then
2425 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2433 /* We must allocate the symbol in our .dynbss section, which will
2434 become part of the .bss section of the executable. There will be
2435 an entry for this symbol in the .dynsym section. The dynamic
2436 object will contain position independent code, so all references
2437 from the dynamic object to this symbol will go through the global
2438 offset table. The dynamic linker will use the .dynsym entry to
2439 determine the address it must put in the global offset table, so
2440 both the dynamic object and the regular object will refer to the
2441 same memory location for the variable. */
2443 htab = elf_x86_64_hash_table (info);
2447 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2448 to copy the initial value out of the dynamic object and into the
2449 runtime process image. */
2450 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2452 const struct elf_backend_data *bed;
2453 bed = get_elf_backend_data (info->output_bfd);
2454 htab->srelbss->size += bed->s->sizeof_rela;
2460 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2463 /* Allocate space in .plt, .got and associated reloc sections for
2467 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2469 struct bfd_link_info *info;
2470 struct elf_x86_64_link_hash_table *htab;
2471 struct elf_x86_64_link_hash_entry *eh;
2472 struct elf_dyn_relocs *p;
2473 const struct elf_backend_data *bed;
2474 unsigned int plt_entry_size;
2476 if (h->root.type == bfd_link_hash_indirect)
2479 eh = (struct elf_x86_64_link_hash_entry *) h;
2481 info = (struct bfd_link_info *) inf;
2482 htab = elf_x86_64_hash_table (info);
2485 bed = get_elf_backend_data (info->output_bfd);
2486 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2488 /* We can't use the GOT PLT if pointer equality is needed since
2489 finish_dynamic_symbol won't clear symbol value and the dynamic
2490 linker won't update the GOT slot. We will get into an infinite
2491 loop at run-time. */
2492 if (htab->plt_got != NULL
2493 && h->type != STT_GNU_IFUNC
2494 && !h->pointer_equality_needed
2495 && h->plt.refcount > 0
2496 && h->got.refcount > 0)
2498 /* Don't use the regular PLT if there are both GOT and GOTPLT
2500 h->plt.offset = (bfd_vma) -1;
2502 /* Use the GOT PLT. */
2503 eh->plt_got.refcount = 1;
2506 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2507 here if it is defined and referenced in a non-shared object. */
2508 if (h->type == STT_GNU_IFUNC
2511 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2517 asection *s = htab->plt_bnd;
2518 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2520 /* Use the .plt.bnd section if it is created. */
2521 eh->plt_bnd.offset = s->size;
2523 /* Make room for this entry in the .plt.bnd section. */
2524 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2532 else if (htab->elf.dynamic_sections_created
2533 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2535 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2537 /* Make sure this symbol is output as a dynamic symbol.
2538 Undefined weak syms won't yet be marked as dynamic. */
2539 if (h->dynindx == -1
2540 && !h->forced_local)
2542 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2547 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2549 asection *s = htab->elf.splt;
2550 asection *bnd_s = htab->plt_bnd;
2551 asection *got_s = htab->plt_got;
2553 /* If this is the first .plt entry, make room for the special
2556 s->size = plt_entry_size;
2559 eh->plt_got.offset = got_s->size;
2562 h->plt.offset = s->size;
2564 eh->plt_bnd.offset = bnd_s->size;
2567 /* If this symbol is not defined in a regular file, and we are
2568 not generating a shared library, then set the symbol to this
2569 location in the .plt. This is required to make function
2570 pointers compare as equal between the normal executable and
2571 the shared library. */
2577 /* We need to make a call to the entry of the GOT PLT
2578 instead of regular PLT entry. */
2579 h->root.u.def.section = got_s;
2580 h->root.u.def.value = eh->plt_got.offset;
2586 /* We need to make a call to the entry of the second
2587 PLT instead of regular PLT entry. */
2588 h->root.u.def.section = bnd_s;
2589 h->root.u.def.value = eh->plt_bnd.offset;
2593 h->root.u.def.section = s;
2594 h->root.u.def.value = h->plt.offset;
2599 /* Make room for this entry. */
2601 got_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2604 s->size += plt_entry_size;
2606 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2608 /* We also need to make an entry in the .got.plt section,
2609 which will be placed in the .got section by the linker
2611 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2613 /* We also need to make an entry in the .rela.plt
2615 htab->elf.srelplt->size += bed->s->sizeof_rela;
2616 htab->elf.srelplt->reloc_count++;
2621 h->plt.offset = (bfd_vma) -1;
2627 h->plt.offset = (bfd_vma) -1;
2631 eh->tlsdesc_got = (bfd_vma) -1;
2633 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2634 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2635 if (h->got.refcount > 0
2638 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2640 h->got.offset = (bfd_vma) -1;
2642 else if (h->got.refcount > 0)
2646 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2648 /* Make sure this symbol is output as a dynamic symbol.
2649 Undefined weak syms won't yet be marked as dynamic. */
2650 if (h->dynindx == -1
2651 && !h->forced_local)
2653 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2657 if (GOT_TLS_GDESC_P (tls_type))
2659 eh->tlsdesc_got = htab->elf.sgotplt->size
2660 - elf_x86_64_compute_jump_table_size (htab);
2661 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2662 h->got.offset = (bfd_vma) -2;
2664 if (! GOT_TLS_GDESC_P (tls_type)
2665 || GOT_TLS_GD_P (tls_type))
2668 h->got.offset = s->size;
2669 s->size += GOT_ENTRY_SIZE;
2670 if (GOT_TLS_GD_P (tls_type))
2671 s->size += GOT_ENTRY_SIZE;
2673 dyn = htab->elf.dynamic_sections_created;
2674 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2676 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2677 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2678 || tls_type == GOT_TLS_IE)
2679 htab->elf.srelgot->size += bed->s->sizeof_rela;
2680 else if (GOT_TLS_GD_P (tls_type))
2681 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2682 else if (! GOT_TLS_GDESC_P (tls_type)
2683 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2684 || h->root.type != bfd_link_hash_undefweak)
2686 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2687 htab->elf.srelgot->size += bed->s->sizeof_rela;
2688 if (GOT_TLS_GDESC_P (tls_type))
2690 htab->elf.srelplt->size += bed->s->sizeof_rela;
2691 htab->tlsdesc_plt = (bfd_vma) -1;
2695 h->got.offset = (bfd_vma) -1;
2697 if (eh->dyn_relocs == NULL)
2700 /* In the shared -Bsymbolic case, discard space allocated for
2701 dynamic pc-relative relocs against symbols which turn out to be
2702 defined in regular objects. For the normal shared case, discard
2703 space for pc-relative relocs that have become local due to symbol
2704 visibility changes. */
2708 /* Relocs that use pc_count are those that appear on a call
2709 insn, or certain REL relocs that can generated via assembly.
2710 We want calls to protected symbols to resolve directly to the
2711 function rather than going via the plt. If people want
2712 function pointer comparisons to work as expected then they
2713 should avoid writing weird assembly. */
2714 if (SYMBOL_CALLS_LOCAL (info, h))
2716 struct elf_dyn_relocs **pp;
2718 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2720 p->count -= p->pc_count;
2729 /* Also discard relocs on undefined weak syms with non-default
2731 if (eh->dyn_relocs != NULL)
2733 if (h->root.type == bfd_link_hash_undefweak)
2735 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2736 eh->dyn_relocs = NULL;
2738 /* Make sure undefined weak symbols are output as a dynamic
2740 else if (h->dynindx == -1
2741 && ! h->forced_local
2742 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2745 /* For PIE, discard space for pc-relative relocs against
2746 symbols which turn out to need copy relocs. */
2747 else if (info->executable
2748 && (h->needs_copy || eh->needs_copy)
2752 struct elf_dyn_relocs **pp;
2754 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2756 if (p->pc_count != 0)
2764 else if (ELIMINATE_COPY_RELOCS)
2766 /* For the non-shared case, discard space for relocs against
2767 symbols which turn out to need copy relocs or are not
2773 || (htab->elf.dynamic_sections_created
2774 && (h->root.type == bfd_link_hash_undefweak
2775 || h->root.type == bfd_link_hash_undefined))))
2777 /* Make sure this symbol is output as a dynamic symbol.
2778 Undefined weak syms won't yet be marked as dynamic. */
2779 if (h->dynindx == -1
2780 && ! h->forced_local
2781 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2784 /* If that succeeded, we know we'll be keeping all the
2786 if (h->dynindx != -1)
2790 eh->dyn_relocs = NULL;
2795 /* Finally, allocate space. */
2796 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2800 sreloc = elf_section_data (p->sec)->sreloc;
2802 BFD_ASSERT (sreloc != NULL);
2804 sreloc->size += p->count * bed->s->sizeof_rela;
2810 /* Allocate space in .plt, .got and associated reloc sections for
2811 local dynamic relocs. */
2814 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2816 struct elf_link_hash_entry *h
2817 = (struct elf_link_hash_entry *) *slot;
2819 if (h->type != STT_GNU_IFUNC
2823 || h->root.type != bfd_link_hash_defined)
2826 return elf_x86_64_allocate_dynrelocs (h, inf);
2829 /* Find any dynamic relocs that apply to read-only sections. */
2832 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2835 struct elf_x86_64_link_hash_entry *eh;
2836 struct elf_dyn_relocs *p;
2838 /* Skip local IFUNC symbols. */
2839 if (h->forced_local && h->type == STT_GNU_IFUNC)
2842 eh = (struct elf_x86_64_link_hash_entry *) h;
2843 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2845 asection *s = p->sec->output_section;
2847 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2849 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2851 info->flags |= DF_TEXTREL;
2853 if (info->warn_shared_textrel && info->shared)
2854 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2855 p->sec->owner, h->root.root.string,
2858 /* Not an error, just cut short the traversal. */
2866 mov foo@GOTPCREL(%rip), %reg
2869 with the local symbol, foo. */
2872 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2873 struct bfd_link_info *link_info)
2875 Elf_Internal_Shdr *symtab_hdr;
2876 Elf_Internal_Rela *internal_relocs;
2877 Elf_Internal_Rela *irel, *irelend;
2879 struct elf_x86_64_link_hash_table *htab;
2880 bfd_boolean changed_contents;
2881 bfd_boolean changed_relocs;
2882 bfd_signed_vma *local_got_refcounts;
2884 /* Don't even try to convert non-ELF outputs. */
2885 if (!is_elf_hash_table (link_info->hash))
2888 /* Nothing to do if there are no codes, no relocations or no output. */
2889 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2890 || sec->reloc_count == 0
2891 || bfd_is_abs_section (sec->output_section))
2894 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2896 /* Load the relocations for this section. */
2897 internal_relocs = (_bfd_elf_link_read_relocs
2898 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2899 link_info->keep_memory));
2900 if (internal_relocs == NULL)
2903 htab = elf_x86_64_hash_table (link_info);
2904 changed_contents = FALSE;
2905 changed_relocs = FALSE;
2906 local_got_refcounts = elf_local_got_refcounts (abfd);
2908 /* Get the section contents. */
2909 if (elf_section_data (sec)->this_hdr.contents != NULL)
2910 contents = elf_section_data (sec)->this_hdr.contents;
2913 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2917 irelend = internal_relocs + sec->reloc_count;
2918 for (irel = internal_relocs; irel < irelend; irel++)
2920 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2921 unsigned int r_symndx = htab->r_sym (irel->r_info);
2923 struct elf_link_hash_entry *h;
2925 if (r_type != R_X86_64_GOTPCREL)
2928 /* Get the symbol referred to by the reloc. */
2929 if (r_symndx < symtab_hdr->sh_info)
2931 Elf_Internal_Sym *isym;
2933 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2936 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2937 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2938 && irel->r_offset >= 2
2939 && bfd_get_8 (input_bfd,
2940 contents + irel->r_offset - 2) == 0x8b)
2942 bfd_put_8 (output_bfd, 0x8d,
2943 contents + irel->r_offset - 2);
2944 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2945 if (local_got_refcounts != NULL
2946 && local_got_refcounts[r_symndx] > 0)
2947 local_got_refcounts[r_symndx] -= 1;
2948 changed_contents = TRUE;
2949 changed_relocs = TRUE;
2954 indx = r_symndx - symtab_hdr->sh_info;
2955 h = elf_sym_hashes (abfd)[indx];
2956 BFD_ASSERT (h != NULL);
2958 while (h->root.type == bfd_link_hash_indirect
2959 || h->root.type == bfd_link_hash_warning)
2960 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2962 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2963 avoid optimizing _DYNAMIC since ld.so may use its link-time
2966 && h->type != STT_GNU_IFUNC
2967 && h != htab->elf.hdynamic
2968 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2969 && irel->r_offset >= 2
2970 && bfd_get_8 (input_bfd,
2971 contents + irel->r_offset - 2) == 0x8b)
2973 bfd_put_8 (output_bfd, 0x8d,
2974 contents + irel->r_offset - 2);
2975 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2976 if (h->got.refcount > 0)
2977 h->got.refcount -= 1;
2978 changed_contents = TRUE;
2979 changed_relocs = TRUE;
2983 if (contents != NULL
2984 && elf_section_data (sec)->this_hdr.contents != contents)
2986 if (!changed_contents && !link_info->keep_memory)
2990 /* Cache the section contents for elf_link_input_bfd. */
2991 elf_section_data (sec)->this_hdr.contents = contents;
2995 if (elf_section_data (sec)->relocs != internal_relocs)
2997 if (!changed_relocs)
2998 free (internal_relocs);
3000 elf_section_data (sec)->relocs = internal_relocs;
3006 if (contents != NULL
3007 && elf_section_data (sec)->this_hdr.contents != contents)
3009 if (internal_relocs != NULL
3010 && elf_section_data (sec)->relocs != internal_relocs)
3011 free (internal_relocs);
3015 /* Set the sizes of the dynamic sections. */
3018 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3019 struct bfd_link_info *info)
3021 struct elf_x86_64_link_hash_table *htab;
3026 const struct elf_backend_data *bed;
3028 htab = elf_x86_64_hash_table (info);
3031 bed = get_elf_backend_data (output_bfd);
3033 dynobj = htab->elf.dynobj;
3037 if (htab->elf.dynamic_sections_created)
3039 /* Set the contents of the .interp section to the interpreter. */
3040 if (info->executable)
3042 s = bfd_get_linker_section (dynobj, ".interp");
3045 s->size = htab->dynamic_interpreter_size;
3046 s->contents = (unsigned char *) htab->dynamic_interpreter;
3050 /* Set up .got offsets for local syms, and space for local dynamic
3052 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3054 bfd_signed_vma *local_got;
3055 bfd_signed_vma *end_local_got;
3056 char *local_tls_type;
3057 bfd_vma *local_tlsdesc_gotent;
3058 bfd_size_type locsymcount;
3059 Elf_Internal_Shdr *symtab_hdr;
3062 if (! is_x86_64_elf (ibfd))
3065 for (s = ibfd->sections; s != NULL; s = s->next)
3067 struct elf_dyn_relocs *p;
3069 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
3072 for (p = (struct elf_dyn_relocs *)
3073 (elf_section_data (s)->local_dynrel);
3077 if (!bfd_is_abs_section (p->sec)
3078 && bfd_is_abs_section (p->sec->output_section))
3080 /* Input section has been discarded, either because
3081 it is a copy of a linkonce section or due to
3082 linker script /DISCARD/, so we'll be discarding
3085 else if (p->count != 0)
3087 srel = elf_section_data (p->sec)->sreloc;
3088 srel->size += p->count * bed->s->sizeof_rela;
3089 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3090 && (info->flags & DF_TEXTREL) == 0)
3092 info->flags |= DF_TEXTREL;
3093 if (info->warn_shared_textrel && info->shared)
3094 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
3095 p->sec->owner, p->sec);
3101 local_got = elf_local_got_refcounts (ibfd);
3105 symtab_hdr = &elf_symtab_hdr (ibfd);
3106 locsymcount = symtab_hdr->sh_info;
3107 end_local_got = local_got + locsymcount;
3108 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3109 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3111 srel = htab->elf.srelgot;
3112 for (; local_got < end_local_got;
3113 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3115 *local_tlsdesc_gotent = (bfd_vma) -1;
3118 if (GOT_TLS_GDESC_P (*local_tls_type))
3120 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3121 - elf_x86_64_compute_jump_table_size (htab);
3122 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3123 *local_got = (bfd_vma) -2;
3125 if (! GOT_TLS_GDESC_P (*local_tls_type)
3126 || GOT_TLS_GD_P (*local_tls_type))
3128 *local_got = s->size;
3129 s->size += GOT_ENTRY_SIZE;
3130 if (GOT_TLS_GD_P (*local_tls_type))
3131 s->size += GOT_ENTRY_SIZE;
3134 || GOT_TLS_GD_ANY_P (*local_tls_type)
3135 || *local_tls_type == GOT_TLS_IE)
3137 if (GOT_TLS_GDESC_P (*local_tls_type))
3139 htab->elf.srelplt->size
3140 += bed->s->sizeof_rela;
3141 htab->tlsdesc_plt = (bfd_vma) -1;
3143 if (! GOT_TLS_GDESC_P (*local_tls_type)
3144 || GOT_TLS_GD_P (*local_tls_type))
3145 srel->size += bed->s->sizeof_rela;
3149 *local_got = (bfd_vma) -1;
3153 if (htab->tls_ld_got.refcount > 0)
3155 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3157 htab->tls_ld_got.offset = htab->elf.sgot->size;
3158 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3159 htab->elf.srelgot->size += bed->s->sizeof_rela;
3162 htab->tls_ld_got.offset = -1;
3164 /* Allocate global sym .plt and .got entries, and space for global
3165 sym dynamic relocs. */
3166 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3169 /* Allocate .plt and .got entries, and space for local symbols. */
3170 htab_traverse (htab->loc_hash_table,
3171 elf_x86_64_allocate_local_dynrelocs,
3174 /* For every jump slot reserved in the sgotplt, reloc_count is
3175 incremented. However, when we reserve space for TLS descriptors,
3176 it's not incremented, so in order to compute the space reserved
3177 for them, it suffices to multiply the reloc count by the jump
3180 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3181 so that R_X86_64_IRELATIVE entries come last. */
3182 if (htab->elf.srelplt)
3184 htab->sgotplt_jump_table_size
3185 = elf_x86_64_compute_jump_table_size (htab);
3186 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3188 else if (htab->elf.irelplt)
3189 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3191 if (htab->tlsdesc_plt)
3193 /* If we're not using lazy TLS relocations, don't generate the
3194 PLT and GOT entries they require. */
3195 if ((info->flags & DF_BIND_NOW))
3196 htab->tlsdesc_plt = 0;
3199 htab->tlsdesc_got = htab->elf.sgot->size;
3200 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3201 /* Reserve room for the initial entry.
3202 FIXME: we could probably do away with it in this case. */
3203 if (htab->elf.splt->size == 0)
3204 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3205 htab->tlsdesc_plt = htab->elf.splt->size;
3206 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3210 if (htab->elf.sgotplt)
3212 /* Don't allocate .got.plt section if there are no GOT nor PLT
3213 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3214 if ((htab->elf.hgot == NULL
3215 || !htab->elf.hgot->ref_regular_nonweak)
3216 && (htab->elf.sgotplt->size
3217 == get_elf_backend_data (output_bfd)->got_header_size)
3218 && (htab->elf.splt == NULL
3219 || htab->elf.splt->size == 0)
3220 && (htab->elf.sgot == NULL
3221 || htab->elf.sgot->size == 0)
3222 && (htab->elf.iplt == NULL
3223 || htab->elf.iplt->size == 0)
3224 && (htab->elf.igotplt == NULL
3225 || htab->elf.igotplt->size == 0))
3226 htab->elf.sgotplt->size = 0;
3229 if (htab->plt_eh_frame != NULL
3230 && htab->elf.splt != NULL
3231 && htab->elf.splt->size != 0
3232 && !bfd_is_abs_section (htab->elf.splt->output_section)
3233 && _bfd_elf_eh_frame_present (info))
3235 const struct elf_x86_64_backend_data *arch_data
3236 = get_elf_x86_64_arch_data (bed);
3237 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3240 /* We now have determined the sizes of the various dynamic sections.
3241 Allocate memory for them. */
3243 for (s = dynobj->sections; s != NULL; s = s->next)
3245 if ((s->flags & SEC_LINKER_CREATED) == 0)
3248 if (s == htab->elf.splt
3249 || s == htab->elf.sgot
3250 || s == htab->elf.sgotplt
3251 || s == htab->elf.iplt
3252 || s == htab->elf.igotplt
3253 || s == htab->plt_bnd
3254 || s == htab->plt_got
3255 || s == htab->plt_eh_frame
3256 || s == htab->sdynbss)
3258 /* Strip this section if we don't need it; see the
3261 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3263 if (s->size != 0 && s != htab->elf.srelplt)
3266 /* We use the reloc_count field as a counter if we need
3267 to copy relocs into the output file. */
3268 if (s != htab->elf.srelplt)
3273 /* It's not one of our sections, so don't allocate space. */
3279 /* If we don't need this section, strip it from the
3280 output file. This is mostly to handle .rela.bss and
3281 .rela.plt. We must create both sections in
3282 create_dynamic_sections, because they must be created
3283 before the linker maps input sections to output
3284 sections. The linker does that before
3285 adjust_dynamic_symbol is called, and it is that
3286 function which decides whether anything needs to go
3287 into these sections. */
3289 s->flags |= SEC_EXCLUDE;
3293 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3296 /* Allocate memory for the section contents. We use bfd_zalloc
3297 here in case unused entries are not reclaimed before the
3298 section's contents are written out. This should not happen,
3299 but this way if it does, we get a R_X86_64_NONE reloc instead
3301 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3302 if (s->contents == NULL)
3306 if (htab->plt_eh_frame != NULL
3307 && htab->plt_eh_frame->contents != NULL)
3309 const struct elf_x86_64_backend_data *arch_data
3310 = get_elf_x86_64_arch_data (bed);
3312 memcpy (htab->plt_eh_frame->contents,
3313 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3314 bfd_put_32 (dynobj, htab->elf.splt->size,
3315 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3318 if (htab->elf.dynamic_sections_created)
3320 /* Add some entries to the .dynamic section. We fill in the
3321 values later, in elf_x86_64_finish_dynamic_sections, but we
3322 must add the entries now so that we get the correct size for
3323 the .dynamic section. The DT_DEBUG entry is filled in by the
3324 dynamic linker and used by the debugger. */
3325 #define add_dynamic_entry(TAG, VAL) \
3326 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3328 if (info->executable)
3330 if (!add_dynamic_entry (DT_DEBUG, 0))
3334 if (htab->elf.splt->size != 0)
3336 if (!add_dynamic_entry (DT_PLTGOT, 0)
3337 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3338 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3339 || !add_dynamic_entry (DT_JMPREL, 0))
3342 if (htab->tlsdesc_plt
3343 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3344 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3350 if (!add_dynamic_entry (DT_RELA, 0)
3351 || !add_dynamic_entry (DT_RELASZ, 0)
3352 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3355 /* If any dynamic relocs apply to a read-only section,
3356 then we need a DT_TEXTREL entry. */
3357 if ((info->flags & DF_TEXTREL) == 0)
3358 elf_link_hash_traverse (&htab->elf,
3359 elf_x86_64_readonly_dynrelocs,
3362 if ((info->flags & DF_TEXTREL) != 0)
3364 if (!add_dynamic_entry (DT_TEXTREL, 0))
3369 #undef add_dynamic_entry
3375 elf_x86_64_always_size_sections (bfd *output_bfd,
3376 struct bfd_link_info *info)
3378 asection *tls_sec = elf_hash_table (info)->tls_sec;
3382 struct elf_link_hash_entry *tlsbase;
3384 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3385 "_TLS_MODULE_BASE_",
3386 FALSE, FALSE, FALSE);
3388 if (tlsbase && tlsbase->type == STT_TLS)
3390 struct elf_x86_64_link_hash_table *htab;
3391 struct bfd_link_hash_entry *bh = NULL;
3392 const struct elf_backend_data *bed
3393 = get_elf_backend_data (output_bfd);
3395 htab = elf_x86_64_hash_table (info);
3399 if (!(_bfd_generic_link_add_one_symbol
3400 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3401 tls_sec, 0, NULL, FALSE,
3402 bed->collect, &bh)))
3405 htab->tls_module_base = bh;
3407 tlsbase = (struct elf_link_hash_entry *)bh;
3408 tlsbase->def_regular = 1;
3409 tlsbase->other = STV_HIDDEN;
3410 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3417 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3418 executables. Rather than setting it to the beginning of the TLS
3419 section, we have to set it to the end. This function may be called
3420 multiple times, it is idempotent. */
3423 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3425 struct elf_x86_64_link_hash_table *htab;
3426 struct bfd_link_hash_entry *base;
3428 if (!info->executable)
3431 htab = elf_x86_64_hash_table (info);
3435 base = htab->tls_module_base;
3439 base->u.def.value = htab->elf.tls_size;
3442 /* Return the base VMA address which should be subtracted from real addresses
3443 when resolving @dtpoff relocation.
3444 This is PT_TLS segment p_vaddr. */
3447 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3449 /* If tls_sec is NULL, we should have signalled an error already. */
3450 if (elf_hash_table (info)->tls_sec == NULL)
3452 return elf_hash_table (info)->tls_sec->vma;
3455 /* Return the relocation value for @tpoff relocation
3456 if STT_TLS virtual address is ADDRESS. */
3459 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3461 struct elf_link_hash_table *htab = elf_hash_table (info);
3462 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3463 bfd_vma static_tls_size;
3465 /* If tls_segment is NULL, we should have signalled an error already. */
3466 if (htab->tls_sec == NULL)
3469 /* Consider special static TLS alignment requirements. */
3470 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3471 return address - static_tls_size - htab->tls_sec->vma;
3474 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3478 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3480 /* Opcode Instruction
3483 0x0f 0x8x conditional jump */
3485 && (contents [offset - 1] == 0xe8
3486 || contents [offset - 1] == 0xe9))
3488 && contents [offset - 2] == 0x0f
3489 && (contents [offset - 1] & 0xf0) == 0x80));
3492 /* Relocate an x86_64 ELF section. */
3495 elf_x86_64_relocate_section (bfd *output_bfd,
3496 struct bfd_link_info *info,
3498 asection *input_section,
3500 Elf_Internal_Rela *relocs,
3501 Elf_Internal_Sym *local_syms,
3502 asection **local_sections)
3504 struct elf_x86_64_link_hash_table *htab;
3505 Elf_Internal_Shdr *symtab_hdr;
3506 struct elf_link_hash_entry **sym_hashes;
3507 bfd_vma *local_got_offsets;
3508 bfd_vma *local_tlsdesc_gotents;
3509 Elf_Internal_Rela *rel;
3510 Elf_Internal_Rela *relend;
3511 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3513 BFD_ASSERT (is_x86_64_elf (input_bfd));
3515 htab = elf_x86_64_hash_table (info);
3518 symtab_hdr = &elf_symtab_hdr (input_bfd);
3519 sym_hashes = elf_sym_hashes (input_bfd);
3520 local_got_offsets = elf_local_got_offsets (input_bfd);
3521 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3523 elf_x86_64_set_tls_module_base (info);
3526 relend = relocs + input_section->reloc_count;
3527 for (; rel < relend; rel++)
3529 unsigned int r_type;
3530 reloc_howto_type *howto;
3531 unsigned long r_symndx;
3532 struct elf_link_hash_entry *h;
3533 struct elf_x86_64_link_hash_entry *eh;
3534 Elf_Internal_Sym *sym;
3536 bfd_vma off, offplt, plt_offset;
3538 bfd_boolean unresolved_reloc;
3539 bfd_reloc_status_type r;
3541 asection *base_got, *resolved_plt;
3544 r_type = ELF32_R_TYPE (rel->r_info);
3545 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3546 || r_type == (int) R_X86_64_GNU_VTENTRY)
3549 if (r_type >= (int) R_X86_64_standard)
3551 (*_bfd_error_handler)
3552 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3553 input_bfd, input_section, r_type);
3554 bfd_set_error (bfd_error_bad_value);
3558 if (r_type != (int) R_X86_64_32
3559 || ABI_64_P (output_bfd))
3560 howto = x86_64_elf_howto_table + r_type;
3562 howto = (x86_64_elf_howto_table
3563 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3564 r_symndx = htab->r_sym (rel->r_info);
3568 unresolved_reloc = FALSE;
3569 if (r_symndx < symtab_hdr->sh_info)
3571 sym = local_syms + r_symndx;
3572 sec = local_sections[r_symndx];
3574 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3576 st_size = sym->st_size;
3578 /* Relocate against local STT_GNU_IFUNC symbol. */
3579 if (!info->relocatable
3580 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3582 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3587 /* Set STT_GNU_IFUNC symbol value. */
3588 h->root.u.def.value = sym->st_value;
3589 h->root.u.def.section = sec;
3594 bfd_boolean warned ATTRIBUTE_UNUSED;
3595 bfd_boolean ignored ATTRIBUTE_UNUSED;
3597 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3598 r_symndx, symtab_hdr, sym_hashes,
3600 unresolved_reloc, warned, ignored);
3604 if (sec != NULL && discarded_section (sec))
3605 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3606 rel, 1, relend, howto, 0, contents);
3608 if (info->relocatable)
3611 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3613 if (r_type == R_X86_64_64)
3615 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3616 zero-extend it to 64bit if addend is zero. */
3617 r_type = R_X86_64_32;
3618 memset (contents + rel->r_offset + 4, 0, 4);
3620 else if (r_type == R_X86_64_SIZE64)
3622 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3623 zero-extend it to 64bit if addend is zero. */
3624 r_type = R_X86_64_SIZE32;
3625 memset (contents + rel->r_offset + 4, 0, 4);
3629 eh = (struct elf_x86_64_link_hash_entry *) h;
3631 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3632 it here if it is defined in a non-shared object. */
3634 && h->type == STT_GNU_IFUNC
3640 if ((input_section->flags & SEC_ALLOC) == 0
3641 || h->plt.offset == (bfd_vma) -1)
3644 /* STT_GNU_IFUNC symbol must go through PLT. */
3645 if (htab->elf.splt != NULL)
3647 if (htab->plt_bnd != NULL)
3649 resolved_plt = htab->plt_bnd;
3650 plt_offset = eh->plt_bnd.offset;
3654 resolved_plt = htab->elf.splt;
3655 plt_offset = h->plt.offset;
3660 resolved_plt = htab->elf.iplt;
3661 plt_offset = h->plt.offset;
3664 relocation = (resolved_plt->output_section->vma
3665 + resolved_plt->output_offset + plt_offset);
3670 if (h->root.root.string)
3671 name = h->root.root.string;
3673 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3675 (*_bfd_error_handler)
3676 (_("%B: relocation %s against STT_GNU_IFUNC "
3677 "symbol `%s' isn't handled by %s"), input_bfd,
3678 x86_64_elf_howto_table[r_type].name,
3679 name, __FUNCTION__);
3680 bfd_set_error (bfd_error_bad_value);
3689 if (ABI_64_P (output_bfd))
3693 if (rel->r_addend != 0)
3695 if (h->root.root.string)
3696 name = h->root.root.string;
3698 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3700 (*_bfd_error_handler)
3701 (_("%B: relocation %s against STT_GNU_IFUNC "
3702 "symbol `%s' has non-zero addend: %d"),
3703 input_bfd, x86_64_elf_howto_table[r_type].name,
3704 name, rel->r_addend);
3705 bfd_set_error (bfd_error_bad_value);
3709 /* Generate dynamic relcoation only when there is a
3710 non-GOT reference in a shared object. */
3711 if (info->shared && h->non_got_ref)
3713 Elf_Internal_Rela outrel;
3716 /* Need a dynamic relocation to get the real function
3718 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3722 if (outrel.r_offset == (bfd_vma) -1
3723 || outrel.r_offset == (bfd_vma) -2)
3726 outrel.r_offset += (input_section->output_section->vma
3727 + input_section->output_offset);
3729 if (h->dynindx == -1
3731 || info->executable)
3733 /* This symbol is resolved locally. */
3734 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3735 outrel.r_addend = (h->root.u.def.value
3736 + h->root.u.def.section->output_section->vma
3737 + h->root.u.def.section->output_offset);
3741 outrel.r_info = htab->r_info (h->dynindx, r_type);
3742 outrel.r_addend = 0;
3745 sreloc = htab->elf.irelifunc;
3746 elf_append_rela (output_bfd, sreloc, &outrel);
3748 /* If this reloc is against an external symbol, we
3749 do not want to fiddle with the addend. Otherwise,
3750 we need to include the symbol value so that it
3751 becomes an addend for the dynamic reloc. For an
3752 internal symbol, we have updated addend. */
3757 case R_X86_64_PC32_BND:
3759 case R_X86_64_PLT32:
3760 case R_X86_64_PLT32_BND:
3763 case R_X86_64_GOTPCREL:
3764 case R_X86_64_GOTPCREL64:
3765 base_got = htab->elf.sgot;
3766 off = h->got.offset;
3768 if (base_got == NULL)
3771 if (off == (bfd_vma) -1)
3773 /* We can't use h->got.offset here to save state, or
3774 even just remember the offset, as finish_dynamic_symbol
3775 would use that as offset into .got. */
3777 if (htab->elf.splt != NULL)
3779 plt_index = h->plt.offset / plt_entry_size - 1;
3780 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3781 base_got = htab->elf.sgotplt;
3785 plt_index = h->plt.offset / plt_entry_size;
3786 off = plt_index * GOT_ENTRY_SIZE;
3787 base_got = htab->elf.igotplt;
3790 if (h->dynindx == -1
3794 /* This references the local defitionion. We must
3795 initialize this entry in the global offset table.
3796 Since the offset must always be a multiple of 8,
3797 we use the least significant bit to record
3798 whether we have initialized it already.
3800 When doing a dynamic link, we create a .rela.got
3801 relocation entry to initialize the value. This
3802 is done in the finish_dynamic_symbol routine. */
3807 bfd_put_64 (output_bfd, relocation,
3808 base_got->contents + off);
3809 /* Note that this is harmless for the GOTPLT64
3810 case, as -1 | 1 still is -1. */
3816 relocation = (base_got->output_section->vma
3817 + base_got->output_offset + off);
3823 /* When generating a shared object, the relocations handled here are
3824 copied into the output file to be resolved at run time. */
3827 case R_X86_64_GOT32:
3828 case R_X86_64_GOT64:
3829 /* Relocation is to the entry for this symbol in the global
3831 case R_X86_64_GOTPCREL:
3832 case R_X86_64_GOTPCREL64:
3833 /* Use global offset table entry as symbol value. */
3834 case R_X86_64_GOTPLT64:
3835 /* This is obsolete and treated the the same as GOT64. */
3836 base_got = htab->elf.sgot;
3838 if (htab->elf.sgot == NULL)
3845 off = h->got.offset;
3847 && h->plt.offset != (bfd_vma)-1
3848 && off == (bfd_vma)-1)
3850 /* We can't use h->got.offset here to save
3851 state, or even just remember the offset, as
3852 finish_dynamic_symbol would use that as offset into
3854 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3855 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3856 base_got = htab->elf.sgotplt;
3859 dyn = htab->elf.dynamic_sections_created;
3861 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3863 && SYMBOL_REFERENCES_LOCAL (info, h))
3864 || (ELF_ST_VISIBILITY (h->other)
3865 && h->root.type == bfd_link_hash_undefweak))
3867 /* This is actually a static link, or it is a -Bsymbolic
3868 link and the symbol is defined locally, or the symbol
3869 was forced to be local because of a version file. We
3870 must initialize this entry in the global offset table.
3871 Since the offset must always be a multiple of 8, we
3872 use the least significant bit to record whether we
3873 have initialized it already.
3875 When doing a dynamic link, we create a .rela.got
3876 relocation entry to initialize the value. This is
3877 done in the finish_dynamic_symbol routine. */
3882 bfd_put_64 (output_bfd, relocation,
3883 base_got->contents + off);
3884 /* Note that this is harmless for the GOTPLT64 case,
3885 as -1 | 1 still is -1. */
3890 unresolved_reloc = FALSE;
3894 if (local_got_offsets == NULL)
3897 off = local_got_offsets[r_symndx];
3899 /* The offset must always be a multiple of 8. We use
3900 the least significant bit to record whether we have
3901 already generated the necessary reloc. */
3906 bfd_put_64 (output_bfd, relocation,
3907 base_got->contents + off);
3912 Elf_Internal_Rela outrel;
3914 /* We need to generate a R_X86_64_RELATIVE reloc
3915 for the dynamic linker. */
3916 s = htab->elf.srelgot;
3920 outrel.r_offset = (base_got->output_section->vma
3921 + base_got->output_offset
3923 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3924 outrel.r_addend = relocation;
3925 elf_append_rela (output_bfd, s, &outrel);
3928 local_got_offsets[r_symndx] |= 1;
3932 if (off >= (bfd_vma) -2)
3935 relocation = base_got->output_section->vma
3936 + base_got->output_offset + off;
3937 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3938 relocation -= htab->elf.sgotplt->output_section->vma
3939 - htab->elf.sgotplt->output_offset;
3943 case R_X86_64_GOTOFF64:
3944 /* Relocation is relative to the start of the global offset
3947 /* Check to make sure it isn't a protected function symbol
3948 for shared library since it may not be local when used
3949 as function address. */
3950 if (!info->executable
3952 && !SYMBOLIC_BIND (info, h)
3954 && h->type == STT_FUNC
3955 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3957 (*_bfd_error_handler)
3958 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3959 input_bfd, h->root.root.string);
3960 bfd_set_error (bfd_error_bad_value);
3964 /* Note that sgot is not involved in this
3965 calculation. We always want the start of .got.plt. If we
3966 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3967 permitted by the ABI, we might have to change this
3969 relocation -= htab->elf.sgotplt->output_section->vma
3970 + htab->elf.sgotplt->output_offset;
3973 case R_X86_64_GOTPC32:
3974 case R_X86_64_GOTPC64:
3975 /* Use global offset table as symbol value. */
3976 relocation = htab->elf.sgotplt->output_section->vma
3977 + htab->elf.sgotplt->output_offset;
3978 unresolved_reloc = FALSE;
3981 case R_X86_64_PLTOFF64:
3982 /* Relocation is PLT entry relative to GOT. For local
3983 symbols it's the symbol itself relative to GOT. */
3985 /* See PLT32 handling. */
3986 && h->plt.offset != (bfd_vma) -1
3987 && htab->elf.splt != NULL)
3989 if (htab->plt_bnd != NULL)
3991 resolved_plt = htab->plt_bnd;
3992 plt_offset = eh->plt_bnd.offset;
3996 resolved_plt = htab->elf.splt;
3997 plt_offset = h->plt.offset;
4000 relocation = (resolved_plt->output_section->vma
4001 + resolved_plt->output_offset
4003 unresolved_reloc = FALSE;
4006 relocation -= htab->elf.sgotplt->output_section->vma
4007 + htab->elf.sgotplt->output_offset;
4010 case R_X86_64_PLT32:
4011 case R_X86_64_PLT32_BND:
4012 /* Relocation is to the entry for this symbol in the
4013 procedure linkage table. */
4015 /* Resolve a PLT32 reloc against a local symbol directly,
4016 without using the procedure linkage table. */
4020 if ((h->plt.offset == (bfd_vma) -1
4021 && eh->plt_got.offset == (bfd_vma) -1)
4022 || htab->elf.splt == NULL)
4024 /* We didn't make a PLT entry for this symbol. This
4025 happens when statically linking PIC code, or when
4026 using -Bsymbolic. */
4030 if (h->plt.offset != (bfd_vma) -1)
4032 if (htab->plt_bnd != NULL)
4034 resolved_plt = htab->plt_bnd;
4035 plt_offset = eh->plt_bnd.offset;
4039 resolved_plt = htab->elf.splt;
4040 plt_offset = h->plt.offset;
4045 /* Use the GOT PLT. */
4046 resolved_plt = htab->plt_got;
4047 plt_offset = eh->plt_got.offset;
4050 relocation = (resolved_plt->output_section->vma
4051 + resolved_plt->output_offset
4053 unresolved_reloc = FALSE;
4056 case R_X86_64_SIZE32:
4057 case R_X86_64_SIZE64:
4058 /* Set to symbol size. */
4059 relocation = st_size;
4065 case R_X86_64_PC32_BND:
4066 /* Don't complain about -fPIC if the symbol is undefined when
4067 building executable. */
4069 && (input_section->flags & SEC_ALLOC) != 0
4070 && (input_section->flags & SEC_READONLY) != 0
4072 && !(info->executable
4073 && h->root.type == bfd_link_hash_undefined))
4075 bfd_boolean fail = FALSE;
4077 = ((r_type == R_X86_64_PC32
4078 || r_type == R_X86_64_PC32_BND)
4079 && is_32bit_relative_branch (contents, rel->r_offset));
4081 if (SYMBOL_REFERENCES_LOCAL (info, h))
4083 /* Symbol is referenced locally. Make sure it is
4084 defined locally or for a branch. */
4085 fail = !h->def_regular && !branch;
4087 else if (!(info->executable
4088 && (h->needs_copy || eh->needs_copy)))
4090 /* Symbol doesn't need copy reloc and isn't referenced
4091 locally. We only allow branch to symbol with
4092 non-default visibility. */
4094 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4101 const char *pic = "";
4103 switch (ELF_ST_VISIBILITY (h->other))
4106 v = _("hidden symbol");
4109 v = _("internal symbol");
4112 v = _("protected symbol");
4116 pic = _("; recompile with -fPIC");
4121 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4123 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4125 (*_bfd_error_handler) (fmt, input_bfd,
4126 x86_64_elf_howto_table[r_type].name,
4127 v, h->root.root.string, pic);
4128 bfd_set_error (bfd_error_bad_value);
4139 /* FIXME: The ABI says the linker should make sure the value is
4140 the same when it's zeroextended to 64 bit. */
4143 if ((input_section->flags & SEC_ALLOC) == 0)
4146 /* Don't copy a pc-relative relocation into the output file
4147 if the symbol needs copy reloc or the symbol is undefined
4148 when building executable. */
4150 && !(info->executable
4154 || h->root.type == bfd_link_hash_undefined)
4155 && IS_X86_64_PCREL_TYPE (r_type))
4157 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4158 || h->root.type != bfd_link_hash_undefweak)
4159 && ((! IS_X86_64_PCREL_TYPE (r_type)
4160 && r_type != R_X86_64_SIZE32
4161 && r_type != R_X86_64_SIZE64)
4162 || ! SYMBOL_CALLS_LOCAL (info, h)))
4163 || (ELIMINATE_COPY_RELOCS
4170 || h->root.type == bfd_link_hash_undefweak
4171 || h->root.type == bfd_link_hash_undefined)))
4173 Elf_Internal_Rela outrel;
4174 bfd_boolean skip, relocate;
4177 /* When generating a shared object, these relocations
4178 are copied into the output file to be resolved at run
4184 _bfd_elf_section_offset (output_bfd, info, input_section,
4186 if (outrel.r_offset == (bfd_vma) -1)
4188 else if (outrel.r_offset == (bfd_vma) -2)
4189 skip = TRUE, relocate = TRUE;
4191 outrel.r_offset += (input_section->output_section->vma
4192 + input_section->output_offset);
4195 memset (&outrel, 0, sizeof outrel);
4197 /* h->dynindx may be -1 if this symbol was marked to
4201 && (IS_X86_64_PCREL_TYPE (r_type)
4203 || ! SYMBOLIC_BIND (info, h)
4204 || ! h->def_regular))
4206 outrel.r_info = htab->r_info (h->dynindx, r_type);
4207 outrel.r_addend = rel->r_addend;
4211 /* This symbol is local, or marked to become local. */
4212 if (r_type == htab->pointer_r_type)
4215 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4216 outrel.r_addend = relocation + rel->r_addend;
4218 else if (r_type == R_X86_64_64
4219 && !ABI_64_P (output_bfd))
4222 outrel.r_info = htab->r_info (0,
4223 R_X86_64_RELATIVE64);
4224 outrel.r_addend = relocation + rel->r_addend;
4225 /* Check addend overflow. */
4226 if ((outrel.r_addend & 0x80000000)
4227 != (rel->r_addend & 0x80000000))
4230 int addend = rel->r_addend;
4231 if (h && h->root.root.string)
4232 name = h->root.root.string;
4234 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4237 (*_bfd_error_handler)
4238 (_("%B: addend -0x%x in relocation %s against "
4239 "symbol `%s' at 0x%lx in section `%A' is "
4241 input_bfd, input_section, addend,
4242 x86_64_elf_howto_table[r_type].name,
4243 name, (unsigned long) rel->r_offset);
4245 (*_bfd_error_handler)
4246 (_("%B: addend 0x%x in relocation %s against "
4247 "symbol `%s' at 0x%lx in section `%A' is "
4249 input_bfd, input_section, addend,
4250 x86_64_elf_howto_table[r_type].name,
4251 name, (unsigned long) rel->r_offset);
4252 bfd_set_error (bfd_error_bad_value);
4260 if (bfd_is_abs_section (sec))
4262 else if (sec == NULL || sec->owner == NULL)
4264 bfd_set_error (bfd_error_bad_value);
4271 /* We are turning this relocation into one
4272 against a section symbol. It would be
4273 proper to subtract the symbol's value,
4274 osec->vma, from the emitted reloc addend,
4275 but ld.so expects buggy relocs. */
4276 osec = sec->output_section;
4277 sindx = elf_section_data (osec)->dynindx;
4280 asection *oi = htab->elf.text_index_section;
4281 sindx = elf_section_data (oi)->dynindx;
4283 BFD_ASSERT (sindx != 0);
4286 outrel.r_info = htab->r_info (sindx, r_type);
4287 outrel.r_addend = relocation + rel->r_addend;
4291 sreloc = elf_section_data (input_section)->sreloc;
4293 if (sreloc == NULL || sreloc->contents == NULL)
4295 r = bfd_reloc_notsupported;
4296 goto check_relocation_error;
4299 elf_append_rela (output_bfd, sreloc, &outrel);
4301 /* If this reloc is against an external symbol, we do
4302 not want to fiddle with the addend. Otherwise, we
4303 need to include the symbol value so that it becomes
4304 an addend for the dynamic reloc. */
4311 case R_X86_64_TLSGD:
4312 case R_X86_64_GOTPC32_TLSDESC:
4313 case R_X86_64_TLSDESC_CALL:
4314 case R_X86_64_GOTTPOFF:
4315 tls_type = GOT_UNKNOWN;
4316 if (h == NULL && local_got_offsets)
4317 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4319 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4321 if (! elf_x86_64_tls_transition (info, input_bfd,
4322 input_section, contents,
4323 symtab_hdr, sym_hashes,
4324 &r_type, tls_type, rel,
4325 relend, h, r_symndx))
4328 if (r_type == R_X86_64_TPOFF32)
4330 bfd_vma roff = rel->r_offset;
4332 BFD_ASSERT (! unresolved_reloc);
4334 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4336 /* GD->LE transition. For 64bit, change
4337 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4338 .word 0x6666; rex64; call __tls_get_addr
4341 leaq foo@tpoff(%rax), %rax
4343 leaq foo@tlsgd(%rip), %rdi
4344 .word 0x6666; rex64; call __tls_get_addr
4347 leaq foo@tpoff(%rax), %rax
4348 For largepic, change:
4349 leaq foo@tlsgd(%rip), %rdi
4350 movabsq $__tls_get_addr@pltoff, %rax
4355 leaq foo@tpoff(%rax), %rax
4356 nopw 0x0(%rax,%rax,1) */
4358 if (ABI_64_P (output_bfd)
4359 && contents[roff + 5] == (bfd_byte) '\xb8')
4361 memcpy (contents + roff - 3,
4362 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4363 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4366 else if (ABI_64_P (output_bfd))
4367 memcpy (contents + roff - 4,
4368 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4371 memcpy (contents + roff - 3,
4372 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4374 bfd_put_32 (output_bfd,
4375 elf_x86_64_tpoff (info, relocation),
4376 contents + roff + 8 + largepic);
4377 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4381 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4383 /* GDesc -> LE transition.
4384 It's originally something like:
4385 leaq x@tlsdesc(%rip), %rax
4388 movl $x@tpoff, %rax. */
4390 unsigned int val, type;
4392 type = bfd_get_8 (input_bfd, contents + roff - 3);
4393 val = bfd_get_8 (input_bfd, contents + roff - 1);
4394 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4395 contents + roff - 3);
4396 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4397 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4398 contents + roff - 1);
4399 bfd_put_32 (output_bfd,
4400 elf_x86_64_tpoff (info, relocation),
4404 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4406 /* GDesc -> LE transition.
4411 bfd_put_8 (output_bfd, 0x66, contents + roff);
4412 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4415 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4417 /* IE->LE transition:
4418 For 64bit, originally it can be one of:
4419 movq foo@gottpoff(%rip), %reg
4420 addq foo@gottpoff(%rip), %reg
4423 leaq foo(%reg), %reg
4425 For 32bit, originally it can be one of:
4426 movq foo@gottpoff(%rip), %reg
4427 addl foo@gottpoff(%rip), %reg
4430 leal foo(%reg), %reg
4433 unsigned int val, type, reg;
4436 val = bfd_get_8 (input_bfd, contents + roff - 3);
4439 type = bfd_get_8 (input_bfd, contents + roff - 2);
4440 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4446 bfd_put_8 (output_bfd, 0x49,
4447 contents + roff - 3);
4448 else if (!ABI_64_P (output_bfd) && val == 0x44)
4449 bfd_put_8 (output_bfd, 0x41,
4450 contents + roff - 3);
4451 bfd_put_8 (output_bfd, 0xc7,
4452 contents + roff - 2);
4453 bfd_put_8 (output_bfd, 0xc0 | reg,
4454 contents + roff - 1);
4458 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4461 bfd_put_8 (output_bfd, 0x49,
4462 contents + roff - 3);
4463 else if (!ABI_64_P (output_bfd) && val == 0x44)
4464 bfd_put_8 (output_bfd, 0x41,
4465 contents + roff - 3);
4466 bfd_put_8 (output_bfd, 0x81,
4467 contents + roff - 2);
4468 bfd_put_8 (output_bfd, 0xc0 | reg,
4469 contents + roff - 1);
4473 /* addq/addl -> leaq/leal */
4475 bfd_put_8 (output_bfd, 0x4d,
4476 contents + roff - 3);
4477 else if (!ABI_64_P (output_bfd) && val == 0x44)
4478 bfd_put_8 (output_bfd, 0x45,
4479 contents + roff - 3);
4480 bfd_put_8 (output_bfd, 0x8d,
4481 contents + roff - 2);
4482 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4483 contents + roff - 1);
4485 bfd_put_32 (output_bfd,
4486 elf_x86_64_tpoff (info, relocation),
4494 if (htab->elf.sgot == NULL)
4499 off = h->got.offset;
4500 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4504 if (local_got_offsets == NULL)
4507 off = local_got_offsets[r_symndx];
4508 offplt = local_tlsdesc_gotents[r_symndx];
4515 Elf_Internal_Rela outrel;
4519 if (htab->elf.srelgot == NULL)
4522 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4524 if (GOT_TLS_GDESC_P (tls_type))
4526 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4527 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4528 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4529 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4530 + htab->elf.sgotplt->output_offset
4532 + htab->sgotplt_jump_table_size);
4533 sreloc = htab->elf.srelplt;
4535 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4537 outrel.r_addend = 0;
4538 elf_append_rela (output_bfd, sreloc, &outrel);
4541 sreloc = htab->elf.srelgot;
4543 outrel.r_offset = (htab->elf.sgot->output_section->vma
4544 + htab->elf.sgot->output_offset + off);
4546 if (GOT_TLS_GD_P (tls_type))
4547 dr_type = R_X86_64_DTPMOD64;
4548 else if (GOT_TLS_GDESC_P (tls_type))
4551 dr_type = R_X86_64_TPOFF64;
4553 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4554 outrel.r_addend = 0;
4555 if ((dr_type == R_X86_64_TPOFF64
4556 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4557 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4558 outrel.r_info = htab->r_info (indx, dr_type);
4560 elf_append_rela (output_bfd, sreloc, &outrel);
4562 if (GOT_TLS_GD_P (tls_type))
4566 BFD_ASSERT (! unresolved_reloc);
4567 bfd_put_64 (output_bfd,
4568 relocation - elf_x86_64_dtpoff_base (info),
4569 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4573 bfd_put_64 (output_bfd, 0,
4574 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4575 outrel.r_info = htab->r_info (indx,
4577 outrel.r_offset += GOT_ENTRY_SIZE;
4578 elf_append_rela (output_bfd, sreloc,
4587 local_got_offsets[r_symndx] |= 1;
4590 if (off >= (bfd_vma) -2
4591 && ! GOT_TLS_GDESC_P (tls_type))
4593 if (r_type == ELF32_R_TYPE (rel->r_info))
4595 if (r_type == R_X86_64_GOTPC32_TLSDESC
4596 || r_type == R_X86_64_TLSDESC_CALL)
4597 relocation = htab->elf.sgotplt->output_section->vma
4598 + htab->elf.sgotplt->output_offset
4599 + offplt + htab->sgotplt_jump_table_size;
4601 relocation = htab->elf.sgot->output_section->vma
4602 + htab->elf.sgot->output_offset + off;
4603 unresolved_reloc = FALSE;
4607 bfd_vma roff = rel->r_offset;
4609 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4611 /* GD->IE transition. For 64bit, change
4612 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4613 .word 0x6666; rex64; call __tls_get_addr@plt
4616 addq foo@gottpoff(%rip), %rax
4618 leaq foo@tlsgd(%rip), %rdi
4619 .word 0x6666; rex64; call __tls_get_addr@plt
4622 addq foo@gottpoff(%rip), %rax
4623 For largepic, change:
4624 leaq foo@tlsgd(%rip), %rdi
4625 movabsq $__tls_get_addr@pltoff, %rax
4630 addq foo@gottpoff(%rax), %rax
4631 nopw 0x0(%rax,%rax,1) */
4633 if (ABI_64_P (output_bfd)
4634 && contents[roff + 5] == (bfd_byte) '\xb8')
4636 memcpy (contents + roff - 3,
4637 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4638 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4641 else if (ABI_64_P (output_bfd))
4642 memcpy (contents + roff - 4,
4643 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4646 memcpy (contents + roff - 3,
4647 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4650 relocation = (htab->elf.sgot->output_section->vma
4651 + htab->elf.sgot->output_offset + off
4654 - input_section->output_section->vma
4655 - input_section->output_offset
4657 bfd_put_32 (output_bfd, relocation,
4658 contents + roff + 8 + largepic);
4659 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4663 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4665 /* GDesc -> IE transition.
4666 It's originally something like:
4667 leaq x@tlsdesc(%rip), %rax
4670 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4672 /* Now modify the instruction as appropriate. To
4673 turn a leaq into a movq in the form we use it, it
4674 suffices to change the second byte from 0x8d to
4676 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4678 bfd_put_32 (output_bfd,
4679 htab->elf.sgot->output_section->vma
4680 + htab->elf.sgot->output_offset + off
4682 - input_section->output_section->vma
4683 - input_section->output_offset
4688 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4690 /* GDesc -> IE transition.
4697 bfd_put_8 (output_bfd, 0x66, contents + roff);
4698 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4706 case R_X86_64_TLSLD:
4707 if (! elf_x86_64_tls_transition (info, input_bfd,
4708 input_section, contents,
4709 symtab_hdr, sym_hashes,
4710 &r_type, GOT_UNKNOWN,
4711 rel, relend, h, r_symndx))
4714 if (r_type != R_X86_64_TLSLD)
4716 /* LD->LE transition:
4717 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4718 For 64bit, we change it into:
4719 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4720 For 32bit, we change it into:
4721 nopl 0x0(%rax); movl %fs:0, %eax.
4722 For largepic, change:
4723 leaq foo@tlsgd(%rip), %rdi
4724 movabsq $__tls_get_addr@pltoff, %rax
4728 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4731 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4732 if (ABI_64_P (output_bfd)
4733 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
4734 memcpy (contents + rel->r_offset - 3,
4735 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4736 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4737 else if (ABI_64_P (output_bfd))
4738 memcpy (contents + rel->r_offset - 3,
4739 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4741 memcpy (contents + rel->r_offset - 3,
4742 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4743 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4748 if (htab->elf.sgot == NULL)
4751 off = htab->tls_ld_got.offset;
4756 Elf_Internal_Rela outrel;
4758 if (htab->elf.srelgot == NULL)
4761 outrel.r_offset = (htab->elf.sgot->output_section->vma
4762 + htab->elf.sgot->output_offset + off);
4764 bfd_put_64 (output_bfd, 0,
4765 htab->elf.sgot->contents + off);
4766 bfd_put_64 (output_bfd, 0,
4767 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4768 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4769 outrel.r_addend = 0;
4770 elf_append_rela (output_bfd, htab->elf.srelgot,
4772 htab->tls_ld_got.offset |= 1;
4774 relocation = htab->elf.sgot->output_section->vma
4775 + htab->elf.sgot->output_offset + off;
4776 unresolved_reloc = FALSE;
4779 case R_X86_64_DTPOFF32:
4780 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4781 relocation -= elf_x86_64_dtpoff_base (info);
4783 relocation = elf_x86_64_tpoff (info, relocation);
4786 case R_X86_64_TPOFF32:
4787 case R_X86_64_TPOFF64:
4788 BFD_ASSERT (info->executable);
4789 relocation = elf_x86_64_tpoff (info, relocation);
4792 case R_X86_64_DTPOFF64:
4793 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4794 relocation -= elf_x86_64_dtpoff_base (info);
4801 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4802 because such sections are not SEC_ALLOC and thus ld.so will
4803 not process them. */
4804 if (unresolved_reloc
4805 && !((input_section->flags & SEC_DEBUGGING) != 0
4807 && _bfd_elf_section_offset (output_bfd, info, input_section,
4808 rel->r_offset) != (bfd_vma) -1)
4810 (*_bfd_error_handler)
4811 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4814 (long) rel->r_offset,
4816 h->root.root.string);
4821 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4822 contents, rel->r_offset,
4823 relocation, rel->r_addend);
4825 check_relocation_error:
4826 if (r != bfd_reloc_ok)
4831 name = h->root.root.string;
4834 name = bfd_elf_string_from_elf_section (input_bfd,
4835 symtab_hdr->sh_link,
4840 name = bfd_section_name (input_bfd, sec);
4843 if (r == bfd_reloc_overflow)
4845 if (! ((*info->callbacks->reloc_overflow)
4846 (info, (h ? &h->root : NULL), name, howto->name,
4847 (bfd_vma) 0, input_bfd, input_section,
4853 (*_bfd_error_handler)
4854 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4855 input_bfd, input_section,
4856 (long) rel->r_offset, name, (int) r);
4865 /* Finish up dynamic symbol handling. We set the contents of various
4866 dynamic sections here. */
4869 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4870 struct bfd_link_info *info,
4871 struct elf_link_hash_entry *h,
4872 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4874 struct elf_x86_64_link_hash_table *htab;
4875 const struct elf_x86_64_backend_data *abed;
4876 bfd_boolean use_plt_bnd;
4877 struct elf_x86_64_link_hash_entry *eh;
4879 htab = elf_x86_64_hash_table (info);
4883 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
4884 section only if there is .plt section. */
4885 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
4887 ? &elf_x86_64_bnd_arch_bed
4888 : get_elf_x86_64_backend_data (output_bfd));
4890 eh = (struct elf_x86_64_link_hash_entry *) h;
4892 if (h->plt.offset != (bfd_vma) -1)
4895 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
4896 bfd_vma plt_plt_insn_end, plt_got_insn_size;
4897 Elf_Internal_Rela rela;
4899 asection *plt, *gotplt, *relplt, *resolved_plt;
4900 const struct elf_backend_data *bed;
4901 bfd_vma plt_got_pcrel_offset;
4903 /* When building a static executable, use .iplt, .igot.plt and
4904 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4905 if (htab->elf.splt != NULL)
4907 plt = htab->elf.splt;
4908 gotplt = htab->elf.sgotplt;
4909 relplt = htab->elf.srelplt;
4913 plt = htab->elf.iplt;
4914 gotplt = htab->elf.igotplt;
4915 relplt = htab->elf.irelplt;
4918 /* This symbol has an entry in the procedure linkage table. Set
4920 if ((h->dynindx == -1
4921 && !((h->forced_local || info->executable)
4923 && h->type == STT_GNU_IFUNC))
4929 /* Get the index in the procedure linkage table which
4930 corresponds to this symbol. This is the index of this symbol
4931 in all the symbols for which we are making plt entries. The
4932 first entry in the procedure linkage table is reserved.
4934 Get the offset into the .got table of the entry that
4935 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4936 bytes. The first three are reserved for the dynamic linker.
4938 For static executables, we don't reserve anything. */
4940 if (plt == htab->elf.splt)
4942 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4943 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4947 got_offset = h->plt.offset / abed->plt_entry_size;
4948 got_offset = got_offset * GOT_ENTRY_SIZE;
4951 plt_plt_insn_end = abed->plt_plt_insn_end;
4952 plt_plt_offset = abed->plt_plt_offset;
4953 plt_got_insn_size = abed->plt_got_insn_size;
4954 plt_got_offset = abed->plt_got_offset;
4957 /* Use the second PLT with BND relocations. */
4958 const bfd_byte *plt_entry, *plt2_entry;
4960 if (eh->has_bnd_reloc)
4962 plt_entry = elf_x86_64_bnd_plt_entry;
4963 plt2_entry = elf_x86_64_bnd_plt2_entry;
4967 plt_entry = elf_x86_64_legacy_plt_entry;
4968 plt2_entry = elf_x86_64_legacy_plt2_entry;
4970 /* Subtract 1 since there is no BND prefix. */
4971 plt_plt_insn_end -= 1;
4972 plt_plt_offset -= 1;
4973 plt_got_insn_size -= 1;
4974 plt_got_offset -= 1;
4977 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
4978 == sizeof (elf_x86_64_legacy_plt_entry));
4980 /* Fill in the entry in the procedure linkage table. */
4981 memcpy (plt->contents + h->plt.offset,
4982 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
4983 /* Fill in the entry in the second PLT. */
4984 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
4985 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
4987 resolved_plt = htab->plt_bnd;
4988 plt_offset = eh->plt_bnd.offset;
4992 /* Fill in the entry in the procedure linkage table. */
4993 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4994 abed->plt_entry_size);
4997 plt_offset = h->plt.offset;
5000 /* Insert the relocation positions of the plt section. */
5002 /* Put offset the PC-relative instruction referring to the GOT entry,
5003 subtracting the size of that instruction. */
5004 plt_got_pcrel_offset = (gotplt->output_section->vma
5005 + gotplt->output_offset
5007 - resolved_plt->output_section->vma
5008 - resolved_plt->output_offset
5010 - plt_got_insn_size);
5012 /* Check PC-relative offset overflow in PLT entry. */
5013 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5014 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5015 output_bfd, h->root.root.string);
5017 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5018 resolved_plt->contents + plt_offset + plt_got_offset);
5020 /* Fill in the entry in the global offset table, initially this
5021 points to the second part of the PLT entry. */
5022 bfd_put_64 (output_bfd, (plt->output_section->vma
5023 + plt->output_offset
5024 + h->plt.offset + abed->plt_lazy_offset),
5025 gotplt->contents + got_offset);
5027 /* Fill in the entry in the .rela.plt section. */
5028 rela.r_offset = (gotplt->output_section->vma
5029 + gotplt->output_offset
5031 if (h->dynindx == -1
5032 || ((info->executable
5033 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5035 && h->type == STT_GNU_IFUNC))
5037 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5038 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5039 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5040 rela.r_addend = (h->root.u.def.value
5041 + h->root.u.def.section->output_section->vma
5042 + h->root.u.def.section->output_offset);
5043 /* R_X86_64_IRELATIVE comes last. */
5044 plt_index = htab->next_irelative_index--;
5048 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5050 plt_index = htab->next_jump_slot_index++;
5053 /* Don't fill PLT entry for static executables. */
5054 if (plt == htab->elf.splt)
5056 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5058 /* Put relocation index. */
5059 bfd_put_32 (output_bfd, plt_index,
5060 plt->contents + h->plt.offset + abed->plt_reloc_offset);
5062 /* Put offset for jmp .PLT0 and check for overflow. We don't
5063 check relocation index for overflow since branch displacement
5064 will overflow first. */
5065 if (plt0_offset > 0x80000000)
5066 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5067 output_bfd, h->root.root.string);
5068 bfd_put_32 (output_bfd, - plt0_offset,
5069 plt->contents + h->plt.offset + plt_plt_offset);
5072 bed = get_elf_backend_data (output_bfd);
5073 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5074 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5076 else if (eh->plt_got.offset != (bfd_vma) -1)
5078 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
5079 asection *plt, *got;
5080 bfd_boolean got_after_plt;
5081 int32_t got_pcrel_offset;
5082 const bfd_byte *got_plt_entry;
5084 /* Set the entry in the GOT procedure linkage table. */
5085 plt = htab->plt_got;
5086 got = htab->elf.sgot;
5087 got_offset = h->got.offset;
5089 if (got_offset == (bfd_vma) -1
5090 || h->type == STT_GNU_IFUNC
5095 /* Use the second PLT entry template for the GOT PLT since they
5096 are the identical. */
5097 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
5098 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
5099 if (eh->has_bnd_reloc)
5100 got_plt_entry = elf_x86_64_bnd_plt2_entry;
5103 got_plt_entry = elf_x86_64_legacy_plt2_entry;
5105 /* Subtract 1 since there is no BND prefix. */
5106 plt_got_insn_size -= 1;
5107 plt_got_offset -= 1;
5110 /* Fill in the entry in the GOT procedure linkage table. */
5111 plt_offset = eh->plt_got.offset;
5112 memcpy (plt->contents + plt_offset,
5113 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5115 /* Put offset the PC-relative instruction referring to the GOT
5116 entry, subtracting the size of that instruction. */
5117 got_pcrel_offset = (got->output_section->vma
5118 + got->output_offset
5120 - plt->output_section->vma
5121 - plt->output_offset
5123 - plt_got_insn_size);
5125 /* Check PC-relative offset overflow in GOT PLT entry. */
5126 got_after_plt = got->output_section->vma > plt->output_section->vma;
5127 if ((got_after_plt && got_pcrel_offset < 0)
5128 || (!got_after_plt && got_pcrel_offset > 0))
5129 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5130 output_bfd, h->root.root.string);
5132 bfd_put_32 (output_bfd, got_pcrel_offset,
5133 plt->contents + plt_offset + plt_got_offset);
5137 && (h->plt.offset != (bfd_vma) -1
5138 || eh->plt_got.offset != (bfd_vma) -1))
5140 /* Mark the symbol as undefined, rather than as defined in
5141 the .plt section. Leave the value if there were any
5142 relocations where pointer equality matters (this is a clue
5143 for the dynamic linker, to make function pointer
5144 comparisons work between an application and shared
5145 library), otherwise set it to zero. If a function is only
5146 called from a binary, there is no need to slow down
5147 shared libraries because of that. */
5148 sym->st_shndx = SHN_UNDEF;
5149 if (!h->pointer_equality_needed)
5153 if (h->got.offset != (bfd_vma) -1
5154 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
5155 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
5157 Elf_Internal_Rela rela;
5159 /* This symbol has an entry in the global offset table. Set it
5161 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5164 rela.r_offset = (htab->elf.sgot->output_section->vma
5165 + htab->elf.sgot->output_offset
5166 + (h->got.offset &~ (bfd_vma) 1));
5168 /* If this is a static link, or it is a -Bsymbolic link and the
5169 symbol is defined locally or was forced to be local because
5170 of a version file, we just want to emit a RELATIVE reloc.
5171 The entry in the global offset table will already have been
5172 initialized in the relocate_section function. */
5174 && h->type == STT_GNU_IFUNC)
5178 /* Generate R_X86_64_GLOB_DAT. */
5185 if (!h->pointer_equality_needed)
5188 /* For non-shared object, we can't use .got.plt, which
5189 contains the real function addres if we need pointer
5190 equality. We load the GOT entry with the PLT entry. */
5191 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5192 bfd_put_64 (output_bfd, (plt->output_section->vma
5193 + plt->output_offset
5195 htab->elf.sgot->contents + h->got.offset);
5199 else if (info->shared
5200 && SYMBOL_REFERENCES_LOCAL (info, h))
5202 if (!h->def_regular)
5204 BFD_ASSERT((h->got.offset & 1) != 0);
5205 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5206 rela.r_addend = (h->root.u.def.value
5207 + h->root.u.def.section->output_section->vma
5208 + h->root.u.def.section->output_offset);
5212 BFD_ASSERT((h->got.offset & 1) == 0);
5214 bfd_put_64 (output_bfd, (bfd_vma) 0,
5215 htab->elf.sgot->contents + h->got.offset);
5216 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5220 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5225 Elf_Internal_Rela rela;
5227 /* This symbol needs a copy reloc. Set it up. */
5229 if (h->dynindx == -1
5230 || (h->root.type != bfd_link_hash_defined
5231 && h->root.type != bfd_link_hash_defweak)
5232 || htab->srelbss == NULL)
5235 rela.r_offset = (h->root.u.def.value
5236 + h->root.u.def.section->output_section->vma
5237 + h->root.u.def.section->output_offset);
5238 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5240 elf_append_rela (output_bfd, htab->srelbss, &rela);
5246 /* Finish up local dynamic symbol handling. We set the contents of
5247 various dynamic sections here. */
5250 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5252 struct elf_link_hash_entry *h
5253 = (struct elf_link_hash_entry *) *slot;
5254 struct bfd_link_info *info
5255 = (struct bfd_link_info *) inf;
5257 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5261 /* Used to decide how to sort relocs in an optimal manner for the
5262 dynamic linker, before writing them out. */
5264 static enum elf_reloc_type_class
5265 elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
5266 const asection *rel_sec ATTRIBUTE_UNUSED,
5267 const Elf_Internal_Rela *rela)
5269 switch ((int) ELF32_R_TYPE (rela->r_info))
5271 case R_X86_64_RELATIVE:
5272 case R_X86_64_RELATIVE64:
5273 return reloc_class_relative;
5274 case R_X86_64_JUMP_SLOT:
5275 return reloc_class_plt;
5277 return reloc_class_copy;
5279 return reloc_class_normal;
5283 /* Finish up the dynamic sections. */
5286 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5287 struct bfd_link_info *info)
5289 struct elf_x86_64_link_hash_table *htab;
5292 const struct elf_x86_64_backend_data *abed;
5294 htab = elf_x86_64_hash_table (info);
5298 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5299 section only if there is .plt section. */
5300 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5301 ? &elf_x86_64_bnd_arch_bed
5302 : get_elf_x86_64_backend_data (output_bfd));
5304 dynobj = htab->elf.dynobj;
5305 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5307 if (htab->elf.dynamic_sections_created)
5309 bfd_byte *dyncon, *dynconend;
5310 const struct elf_backend_data *bed;
5311 bfd_size_type sizeof_dyn;
5313 if (sdyn == NULL || htab->elf.sgot == NULL)
5316 bed = get_elf_backend_data (dynobj);
5317 sizeof_dyn = bed->s->sizeof_dyn;
5318 dyncon = sdyn->contents;
5319 dynconend = sdyn->contents + sdyn->size;
5320 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5322 Elf_Internal_Dyn dyn;
5325 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5333 s = htab->elf.sgotplt;
5334 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5338 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5342 s = htab->elf.srelplt->output_section;
5343 dyn.d_un.d_val = s->size;
5347 /* The procedure linkage table relocs (DT_JMPREL) should
5348 not be included in the overall relocs (DT_RELA).
5349 Therefore, we override the DT_RELASZ entry here to
5350 make it not include the JMPREL relocs. Since the
5351 linker script arranges for .rela.plt to follow all
5352 other relocation sections, we don't have to worry
5353 about changing the DT_RELA entry. */
5354 if (htab->elf.srelplt != NULL)
5356 s = htab->elf.srelplt->output_section;
5357 dyn.d_un.d_val -= s->size;
5361 case DT_TLSDESC_PLT:
5363 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5364 + htab->tlsdesc_plt;
5367 case DT_TLSDESC_GOT:
5369 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5370 + htab->tlsdesc_got;
5374 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5377 /* Fill in the special first entry in the procedure linkage table. */
5378 if (htab->elf.splt && htab->elf.splt->size > 0)
5380 /* Fill in the first entry in the procedure linkage table. */
5381 memcpy (htab->elf.splt->contents,
5382 abed->plt0_entry, abed->plt_entry_size);
5383 /* Add offset for pushq GOT+8(%rip), since the instruction
5384 uses 6 bytes subtract this value. */
5385 bfd_put_32 (output_bfd,
5386 (htab->elf.sgotplt->output_section->vma
5387 + htab->elf.sgotplt->output_offset
5389 - htab->elf.splt->output_section->vma
5390 - htab->elf.splt->output_offset
5392 htab->elf.splt->contents + abed->plt0_got1_offset);
5393 /* Add offset for the PC-relative instruction accessing GOT+16,
5394 subtracting the offset to the end of that instruction. */
5395 bfd_put_32 (output_bfd,
5396 (htab->elf.sgotplt->output_section->vma
5397 + htab->elf.sgotplt->output_offset
5399 - htab->elf.splt->output_section->vma
5400 - htab->elf.splt->output_offset
5401 - abed->plt0_got2_insn_end),
5402 htab->elf.splt->contents + abed->plt0_got2_offset);
5404 elf_section_data (htab->elf.splt->output_section)
5405 ->this_hdr.sh_entsize = abed->plt_entry_size;
5407 if (htab->tlsdesc_plt)
5409 bfd_put_64 (output_bfd, (bfd_vma) 0,
5410 htab->elf.sgot->contents + htab->tlsdesc_got);
5412 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5413 abed->plt0_entry, abed->plt_entry_size);
5415 /* Add offset for pushq GOT+8(%rip), since the
5416 instruction uses 6 bytes subtract this value. */
5417 bfd_put_32 (output_bfd,
5418 (htab->elf.sgotplt->output_section->vma
5419 + htab->elf.sgotplt->output_offset
5421 - htab->elf.splt->output_section->vma
5422 - htab->elf.splt->output_offset
5425 htab->elf.splt->contents
5426 + htab->tlsdesc_plt + abed->plt0_got1_offset);
5427 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5428 where TGD stands for htab->tlsdesc_got, subtracting the offset
5429 to the end of that instruction. */
5430 bfd_put_32 (output_bfd,
5431 (htab->elf.sgot->output_section->vma
5432 + htab->elf.sgot->output_offset
5434 - htab->elf.splt->output_section->vma
5435 - htab->elf.splt->output_offset
5437 - abed->plt0_got2_insn_end),
5438 htab->elf.splt->contents
5439 + htab->tlsdesc_plt + abed->plt0_got2_offset);
5444 if (htab->plt_bnd != NULL)
5445 elf_section_data (htab->plt_bnd->output_section)
5446 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
5448 if (htab->elf.sgotplt)
5450 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5452 (*_bfd_error_handler)
5453 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5457 /* Fill in the first three entries in the global offset table. */
5458 if (htab->elf.sgotplt->size > 0)
5460 /* Set the first entry in the global offset table to the address of
5461 the dynamic section. */
5463 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5465 bfd_put_64 (output_bfd,
5466 sdyn->output_section->vma + sdyn->output_offset,
5467 htab->elf.sgotplt->contents);
5468 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5469 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5470 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5473 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
5477 /* Adjust .eh_frame for .plt section. */
5478 if (htab->plt_eh_frame != NULL
5479 && htab->plt_eh_frame->contents != NULL)
5481 if (htab->elf.splt != NULL
5482 && htab->elf.splt->size != 0
5483 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5484 && htab->elf.splt->output_section != NULL
5485 && htab->plt_eh_frame->output_section != NULL)
5487 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5488 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5489 + htab->plt_eh_frame->output_offset
5490 + PLT_FDE_START_OFFSET;
5491 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5492 htab->plt_eh_frame->contents
5493 + PLT_FDE_START_OFFSET);
5495 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5497 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5499 htab->plt_eh_frame->contents))
5504 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5505 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5508 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5509 htab_traverse (htab->loc_hash_table,
5510 elf_x86_64_finish_local_dynamic_symbol,
5516 /* Return an array of PLT entry symbol values. */
5519 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5522 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5525 bfd_vma *plt_sym_val;
5527 bfd_byte *plt_contents;
5528 const struct elf_x86_64_backend_data *bed;
5529 Elf_Internal_Shdr *hdr;
5532 /* Get the .plt section contents. PLT passed down may point to the
5533 .plt.bnd section. Make sure that PLT always points to the .plt
5535 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
5540 plt = bfd_get_section_by_name (abfd, ".plt");
5543 bed = &elf_x86_64_bnd_arch_bed;
5546 bed = get_elf_x86_64_backend_data (abfd);
5548 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5549 if (plt_contents == NULL)
5551 if (!bfd_get_section_contents (abfd, (asection *) plt,
5552 plt_contents, 0, plt->size))
5555 free (plt_contents);
5559 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5560 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5563 hdr = &elf_section_data (relplt)->this_hdr;
5564 count = relplt->size / hdr->sh_entsize;
5566 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5567 if (plt_sym_val == NULL)
5570 for (i = 0; i < count; i++, p++)
5571 plt_sym_val[i] = -1;
5573 plt_offset = bed->plt_entry_size;
5574 p = relplt->relocation;
5575 for (i = 0; i < count; i++, p++)
5579 /* Skip unknown relocation. */
5580 if (p->howto == NULL)
5583 if (p->howto->type != R_X86_64_JUMP_SLOT
5584 && p->howto->type != R_X86_64_IRELATIVE)
5587 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5588 + bed->plt_reloc_offset));
5589 if (reloc_index >= count)
5593 /* This is the index in .plt section. */
5594 long plt_index = plt_offset / bed->plt_entry_size;
5595 /* Store VMA + the offset in .plt.bnd section. */
5596 plt_sym_val[reloc_index] =
5598 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
5601 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5602 plt_offset += bed->plt_entry_size;
5605 free (plt_contents);
5610 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5614 elf_x86_64_get_synthetic_symtab (bfd *abfd,
5621 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5622 as PLT if it exists. */
5623 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
5625 plt = bfd_get_section_by_name (abfd, ".plt");
5626 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5627 dynsymcount, dynsyms, ret,
5629 elf_x86_64_get_plt_sym_val);
5632 /* Handle an x86-64 specific section when reading an object file. This
5633 is called when elfcode.h finds a section with an unknown type. */
5636 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5637 const char *name, int shindex)
5639 if (hdr->sh_type != SHT_X86_64_UNWIND)
5642 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5648 /* Hook called by the linker routine which adds symbols from an object
5649 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5653 elf_x86_64_add_symbol_hook (bfd *abfd,
5654 struct bfd_link_info *info,
5655 Elf_Internal_Sym *sym,
5656 const char **namep ATTRIBUTE_UNUSED,
5657 flagword *flagsp ATTRIBUTE_UNUSED,
5663 switch (sym->st_shndx)
5665 case SHN_X86_64_LCOMMON:
5666 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
5669 lcomm = bfd_make_section_with_flags (abfd,
5673 | SEC_LINKER_CREATED));
5676 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
5679 *valp = sym->st_size;
5683 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5684 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5685 && (abfd->flags & DYNAMIC) == 0
5686 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5687 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5693 /* Given a BFD section, try to locate the corresponding ELF section
5697 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
5698 asection *sec, int *index_return)
5700 if (sec == &_bfd_elf_large_com_section)
5702 *index_return = SHN_X86_64_LCOMMON;
5708 /* Process a symbol. */
5711 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5714 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5716 switch (elfsym->internal_elf_sym.st_shndx)
5718 case SHN_X86_64_LCOMMON:
5719 asym->section = &_bfd_elf_large_com_section;
5720 asym->value = elfsym->internal_elf_sym.st_size;
5721 /* Common symbol doesn't set BSF_GLOBAL. */
5722 asym->flags &= ~BSF_GLOBAL;
5728 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5730 return (sym->st_shndx == SHN_COMMON
5731 || sym->st_shndx == SHN_X86_64_LCOMMON);
5735 elf_x86_64_common_section_index (asection *sec)
5737 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5740 return SHN_X86_64_LCOMMON;
5744 elf_x86_64_common_section (asection *sec)
5746 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5747 return bfd_com_section_ptr;
5749 return &_bfd_elf_large_com_section;
5753 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
5754 const Elf_Internal_Sym *sym,
5759 const asection *oldsec)
5761 /* A normal common symbol and a large common symbol result in a
5762 normal common symbol. We turn the large common symbol into a
5765 && h->root.type == bfd_link_hash_common
5767 && bfd_is_com_section (*psec)
5770 if (sym->st_shndx == SHN_COMMON
5771 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
5773 h->root.u.c.p->section
5774 = bfd_make_section_old_way (oldbfd, "COMMON");
5775 h->root.u.c.p->section->flags = SEC_ALLOC;
5777 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5778 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
5779 *psec = bfd_com_section_ptr;
5786 elf_x86_64_additional_program_headers (bfd *abfd,
5787 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5792 /* Check to see if we need a large readonly segment. */
5793 s = bfd_get_section_by_name (abfd, ".lrodata");
5794 if (s && (s->flags & SEC_LOAD))
5797 /* Check to see if we need a large data segment. Since .lbss sections
5798 is placed right after the .bss section, there should be no need for
5799 a large data segment just because of .lbss. */
5800 s = bfd_get_section_by_name (abfd, ".ldata");
5801 if (s && (s->flags & SEC_LOAD))
5807 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5810 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5812 if (h->plt.offset != (bfd_vma) -1
5814 && !h->pointer_equality_needed)
5817 return _bfd_elf_hash_symbol (h);
5820 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5823 elf_x86_64_relocs_compatible (const bfd_target *input,
5824 const bfd_target *output)
5826 return ((xvec_get_elf_backend_data (input)->s->elfclass
5827 == xvec_get_elf_backend_data (output)->s->elfclass)
5828 && _bfd_elf_relocs_compatible (input, output));
5831 static const struct bfd_elf_special_section
5832 elf_x86_64_special_sections[]=
5834 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5835 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5836 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5837 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5838 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5839 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5840 { NULL, 0, 0, 0, 0 }
5843 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5844 #define TARGET_LITTLE_NAME "elf64-x86-64"
5845 #define ELF_ARCH bfd_arch_i386
5846 #define ELF_TARGET_ID X86_64_ELF_DATA
5847 #define ELF_MACHINE_CODE EM_X86_64
5848 #define ELF_MAXPAGESIZE 0x200000
5849 #define ELF_MINPAGESIZE 0x1000
5850 #define ELF_COMMONPAGESIZE 0x1000
5852 #define elf_backend_can_gc_sections 1
5853 #define elf_backend_can_refcount 1
5854 #define elf_backend_want_got_plt 1
5855 #define elf_backend_plt_readonly 1
5856 #define elf_backend_want_plt_sym 0
5857 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5858 #define elf_backend_rela_normal 1
5859 #define elf_backend_plt_alignment 4
5861 #define elf_info_to_howto elf_x86_64_info_to_howto
5863 #define bfd_elf64_bfd_link_hash_table_create \
5864 elf_x86_64_link_hash_table_create
5865 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5866 #define bfd_elf64_bfd_reloc_name_lookup \
5867 elf_x86_64_reloc_name_lookup
5869 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5870 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5871 #define elf_backend_check_relocs elf_x86_64_check_relocs
5872 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5873 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5874 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5875 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5876 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5877 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5878 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5879 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5881 #define elf_backend_write_core_note elf_x86_64_write_core_note
5883 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5884 #define elf_backend_relocate_section elf_x86_64_relocate_section
5885 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5886 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5887 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5888 #define elf_backend_object_p elf64_x86_64_elf_object_p
5889 #define bfd_elf64_mkobject elf_x86_64_mkobject
5890 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5892 #define elf_backend_section_from_shdr \
5893 elf_x86_64_section_from_shdr
5895 #define elf_backend_section_from_bfd_section \
5896 elf_x86_64_elf_section_from_bfd_section
5897 #define elf_backend_add_symbol_hook \
5898 elf_x86_64_add_symbol_hook
5899 #define elf_backend_symbol_processing \
5900 elf_x86_64_symbol_processing
5901 #define elf_backend_common_section_index \
5902 elf_x86_64_common_section_index
5903 #define elf_backend_common_section \
5904 elf_x86_64_common_section
5905 #define elf_backend_common_definition \
5906 elf_x86_64_common_definition
5907 #define elf_backend_merge_symbol \
5908 elf_x86_64_merge_symbol
5909 #define elf_backend_special_sections \
5910 elf_x86_64_special_sections
5911 #define elf_backend_additional_program_headers \
5912 elf_x86_64_additional_program_headers
5913 #define elf_backend_hash_symbol \
5914 elf_x86_64_hash_symbol
5916 #include "elf64-target.h"
5918 /* FreeBSD support. */
5920 #undef TARGET_LITTLE_SYM
5921 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5922 #undef TARGET_LITTLE_NAME
5923 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5926 #define ELF_OSABI ELFOSABI_FREEBSD
5929 #define elf64_bed elf64_x86_64_fbsd_bed
5931 #include "elf64-target.h"
5933 /* Solaris 2 support. */
5935 #undef TARGET_LITTLE_SYM
5936 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5937 #undef TARGET_LITTLE_NAME
5938 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5940 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5941 objects won't be recognized. */
5945 #define elf64_bed elf64_x86_64_sol2_bed
5947 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5949 #undef elf_backend_static_tls_alignment
5950 #define elf_backend_static_tls_alignment 16
5952 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5954 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5956 #undef elf_backend_want_plt_sym
5957 #define elf_backend_want_plt_sym 1
5959 #include "elf64-target.h"
5961 /* Native Client support. */
5964 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
5966 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
5967 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
5971 #undef TARGET_LITTLE_SYM
5972 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
5973 #undef TARGET_LITTLE_NAME
5974 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5976 #define elf64_bed elf64_x86_64_nacl_bed
5978 #undef ELF_MAXPAGESIZE
5979 #undef ELF_MINPAGESIZE
5980 #undef ELF_COMMONPAGESIZE
5981 #define ELF_MAXPAGESIZE 0x10000
5982 #define ELF_MINPAGESIZE 0x10000
5983 #define ELF_COMMONPAGESIZE 0x10000
5985 /* Restore defaults. */
5987 #undef elf_backend_static_tls_alignment
5988 #undef elf_backend_want_plt_sym
5989 #define elf_backend_want_plt_sym 0
5991 /* NaCl uses substantially different PLT entries for the same effects. */
5993 #undef elf_backend_plt_alignment
5994 #define elf_backend_plt_alignment 5
5995 #define NACL_PLT_ENTRY_SIZE 64
5996 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5998 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6000 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6001 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6002 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6003 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6004 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6006 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6007 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6009 /* 32 bytes of nop to pad out to the standard size. */
6010 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6011 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6012 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6013 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6014 0x66, /* excess data32 prefix */
6018 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6020 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6021 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6022 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6023 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6025 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6026 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6027 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6029 /* Lazy GOT entries point here (32-byte aligned). */
6030 0x68, /* pushq immediate */
6031 0, 0, 0, 0, /* replaced with index into relocation table. */
6032 0xe9, /* jmp relative */
6033 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6035 /* 22 bytes of nop to pad out to the standard size. */
6036 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6037 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6038 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6041 /* .eh_frame covering the .plt section. */
6043 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6045 #if (PLT_CIE_LENGTH != 20 \
6046 || PLT_FDE_LENGTH != 36 \
6047 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6048 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6049 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6051 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6052 0, 0, 0, 0, /* CIE ID */
6053 1, /* CIE version */
6054 'z', 'R', 0, /* Augmentation string */
6055 1, /* Code alignment factor */
6056 0x78, /* Data alignment factor */
6057 16, /* Return address column */
6058 1, /* Augmentation size */
6059 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6060 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6061 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6062 DW_CFA_nop, DW_CFA_nop,
6064 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6065 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6066 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6067 0, 0, 0, 0, /* .plt size goes here */
6068 0, /* Augmentation size */
6069 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6070 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6071 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6072 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6073 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6074 13, /* Block length */
6075 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6076 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6077 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6078 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6079 DW_CFA_nop, DW_CFA_nop
6082 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6084 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6085 elf_x86_64_nacl_plt_entry, /* plt_entry */
6086 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6087 2, /* plt0_got1_offset */
6088 9, /* plt0_got2_offset */
6089 13, /* plt0_got2_insn_end */
6090 3, /* plt_got_offset */
6091 33, /* plt_reloc_offset */
6092 38, /* plt_plt_offset */
6093 7, /* plt_got_insn_size */
6094 42, /* plt_plt_insn_end */
6095 32, /* plt_lazy_offset */
6096 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6097 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6100 #undef elf_backend_arch_data
6101 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6103 #undef elf_backend_object_p
6104 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6105 #undef elf_backend_modify_segment_map
6106 #define elf_backend_modify_segment_map nacl_modify_segment_map
6107 #undef elf_backend_modify_program_headers
6108 #define elf_backend_modify_program_headers nacl_modify_program_headers
6109 #undef elf_backend_final_write_processing
6110 #define elf_backend_final_write_processing nacl_final_write_processing
6112 #include "elf64-target.h"
6114 /* Native Client x32 support. */
6117 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6119 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6120 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6124 #undef TARGET_LITTLE_SYM
6125 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6126 #undef TARGET_LITTLE_NAME
6127 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6129 #define elf32_bed elf32_x86_64_nacl_bed
6131 #define bfd_elf32_bfd_link_hash_table_create \
6132 elf_x86_64_link_hash_table_create
6133 #define bfd_elf32_bfd_reloc_type_lookup \
6134 elf_x86_64_reloc_type_lookup
6135 #define bfd_elf32_bfd_reloc_name_lookup \
6136 elf_x86_64_reloc_name_lookup
6137 #define bfd_elf32_mkobject \
6139 #define bfd_elf32_get_synthetic_symtab \
6140 elf_x86_64_get_synthetic_symtab
6142 #undef elf_backend_object_p
6143 #define elf_backend_object_p \
6144 elf32_x86_64_nacl_elf_object_p
6146 #undef elf_backend_bfd_from_remote_memory
6147 #define elf_backend_bfd_from_remote_memory \
6148 _bfd_elf32_bfd_from_remote_memory
6150 #undef elf_backend_size_info
6151 #define elf_backend_size_info \
6152 _bfd_elf32_size_info
6154 #include "elf32-target.h"
6156 /* Restore defaults. */
6157 #undef elf_backend_object_p
6158 #define elf_backend_object_p elf64_x86_64_elf_object_p
6159 #undef elf_backend_bfd_from_remote_memory
6160 #undef elf_backend_size_info
6161 #undef elf_backend_modify_segment_map
6162 #undef elf_backend_modify_program_headers
6163 #undef elf_backend_final_write_processing
6165 /* Intel L1OM support. */
6168 elf64_l1om_elf_object_p (bfd *abfd)
6170 /* Set the right machine number for an L1OM elf64 file. */
6171 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6175 #undef TARGET_LITTLE_SYM
6176 #define TARGET_LITTLE_SYM l1om_elf64_vec
6177 #undef TARGET_LITTLE_NAME
6178 #define TARGET_LITTLE_NAME "elf64-l1om"
6180 #define ELF_ARCH bfd_arch_l1om
6182 #undef ELF_MACHINE_CODE
6183 #define ELF_MACHINE_CODE EM_L1OM
6188 #define elf64_bed elf64_l1om_bed
6190 #undef elf_backend_object_p
6191 #define elf_backend_object_p elf64_l1om_elf_object_p
6193 /* Restore defaults. */
6194 #undef ELF_MAXPAGESIZE
6195 #undef ELF_MINPAGESIZE
6196 #undef ELF_COMMONPAGESIZE
6197 #define ELF_MAXPAGESIZE 0x200000
6198 #define ELF_MINPAGESIZE 0x1000
6199 #define ELF_COMMONPAGESIZE 0x1000
6200 #undef elf_backend_plt_alignment
6201 #define elf_backend_plt_alignment 4
6202 #undef elf_backend_arch_data
6203 #define elf_backend_arch_data &elf_x86_64_arch_bed
6205 #include "elf64-target.h"
6207 /* FreeBSD L1OM support. */
6209 #undef TARGET_LITTLE_SYM
6210 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6211 #undef TARGET_LITTLE_NAME
6212 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6215 #define ELF_OSABI ELFOSABI_FREEBSD
6218 #define elf64_bed elf64_l1om_fbsd_bed
6220 #include "elf64-target.h"
6222 /* Intel K1OM support. */
6225 elf64_k1om_elf_object_p (bfd *abfd)
6227 /* Set the right machine number for an K1OM elf64 file. */
6228 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6232 #undef TARGET_LITTLE_SYM
6233 #define TARGET_LITTLE_SYM k1om_elf64_vec
6234 #undef TARGET_LITTLE_NAME
6235 #define TARGET_LITTLE_NAME "elf64-k1om"
6237 #define ELF_ARCH bfd_arch_k1om
6239 #undef ELF_MACHINE_CODE
6240 #define ELF_MACHINE_CODE EM_K1OM
6245 #define elf64_bed elf64_k1om_bed
6247 #undef elf_backend_object_p
6248 #define elf_backend_object_p elf64_k1om_elf_object_p
6250 #undef elf_backend_static_tls_alignment
6252 #undef elf_backend_want_plt_sym
6253 #define elf_backend_want_plt_sym 0
6255 #include "elf64-target.h"
6257 /* FreeBSD K1OM support. */
6259 #undef TARGET_LITTLE_SYM
6260 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6261 #undef TARGET_LITTLE_NAME
6262 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6265 #define ELF_OSABI ELFOSABI_FREEBSD
6268 #define elf64_bed elf64_k1om_fbsd_bed
6270 #include "elf64-target.h"
6272 /* 32bit x86-64 support. */
6274 #undef TARGET_LITTLE_SYM
6275 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6276 #undef TARGET_LITTLE_NAME
6277 #define TARGET_LITTLE_NAME "elf32-x86-64"
6281 #define ELF_ARCH bfd_arch_i386
6283 #undef ELF_MACHINE_CODE
6284 #define ELF_MACHINE_CODE EM_X86_64
6288 #undef elf_backend_object_p
6289 #define elf_backend_object_p \
6290 elf32_x86_64_elf_object_p
6292 #undef elf_backend_bfd_from_remote_memory
6293 #define elf_backend_bfd_from_remote_memory \
6294 _bfd_elf32_bfd_from_remote_memory
6296 #undef elf_backend_size_info
6297 #define elf_backend_size_info \
6298 _bfd_elf32_size_info
6300 #include "elf32-target.h"