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, 0, 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 relocs against symbols which
2746 turn out to need copy relocs. */
2747 else if (info->executable
2748 && (h->needs_copy || eh->needs_copy)
2751 eh->dyn_relocs = NULL;
2754 else if (ELIMINATE_COPY_RELOCS)
2756 /* For the non-shared case, discard space for relocs against
2757 symbols which turn out to need copy relocs or are not
2763 || (htab->elf.dynamic_sections_created
2764 && (h->root.type == bfd_link_hash_undefweak
2765 || h->root.type == bfd_link_hash_undefined))))
2767 /* Make sure this symbol is output as a dynamic symbol.
2768 Undefined weak syms won't yet be marked as dynamic. */
2769 if (h->dynindx == -1
2770 && ! h->forced_local
2771 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2774 /* If that succeeded, we know we'll be keeping all the
2776 if (h->dynindx != -1)
2780 eh->dyn_relocs = NULL;
2785 /* Finally, allocate space. */
2786 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2790 sreloc = elf_section_data (p->sec)->sreloc;
2792 BFD_ASSERT (sreloc != NULL);
2794 sreloc->size += p->count * bed->s->sizeof_rela;
2800 /* Allocate space in .plt, .got and associated reloc sections for
2801 local dynamic relocs. */
2804 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2806 struct elf_link_hash_entry *h
2807 = (struct elf_link_hash_entry *) *slot;
2809 if (h->type != STT_GNU_IFUNC
2813 || h->root.type != bfd_link_hash_defined)
2816 return elf_x86_64_allocate_dynrelocs (h, inf);
2819 /* Find any dynamic relocs that apply to read-only sections. */
2822 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2825 struct elf_x86_64_link_hash_entry *eh;
2826 struct elf_dyn_relocs *p;
2828 /* Skip local IFUNC symbols. */
2829 if (h->forced_local && h->type == STT_GNU_IFUNC)
2832 eh = (struct elf_x86_64_link_hash_entry *) h;
2833 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2835 asection *s = p->sec->output_section;
2837 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2839 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2841 info->flags |= DF_TEXTREL;
2843 if (info->warn_shared_textrel && info->shared)
2844 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2845 p->sec->owner, h->root.root.string,
2848 /* Not an error, just cut short the traversal. */
2856 mov foo@GOTPCREL(%rip), %reg
2859 with the local symbol, foo. */
2862 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2863 struct bfd_link_info *link_info)
2865 Elf_Internal_Shdr *symtab_hdr;
2866 Elf_Internal_Rela *internal_relocs;
2867 Elf_Internal_Rela *irel, *irelend;
2869 struct elf_x86_64_link_hash_table *htab;
2870 bfd_boolean changed_contents;
2871 bfd_boolean changed_relocs;
2872 bfd_signed_vma *local_got_refcounts;
2874 /* Don't even try to convert non-ELF outputs. */
2875 if (!is_elf_hash_table (link_info->hash))
2878 /* Nothing to do if there are no codes, no relocations or no output. */
2879 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2880 || sec->reloc_count == 0
2881 || bfd_is_abs_section (sec->output_section))
2884 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2886 /* Load the relocations for this section. */
2887 internal_relocs = (_bfd_elf_link_read_relocs
2888 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2889 link_info->keep_memory));
2890 if (internal_relocs == NULL)
2893 htab = elf_x86_64_hash_table (link_info);
2894 changed_contents = FALSE;
2895 changed_relocs = FALSE;
2896 local_got_refcounts = elf_local_got_refcounts (abfd);
2898 /* Get the section contents. */
2899 if (elf_section_data (sec)->this_hdr.contents != NULL)
2900 contents = elf_section_data (sec)->this_hdr.contents;
2903 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2907 irelend = internal_relocs + sec->reloc_count;
2908 for (irel = internal_relocs; irel < irelend; irel++)
2910 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2911 unsigned int r_symndx = htab->r_sym (irel->r_info);
2913 struct elf_link_hash_entry *h;
2915 if (r_type != R_X86_64_GOTPCREL)
2918 /* Get the symbol referred to by the reloc. */
2919 if (r_symndx < symtab_hdr->sh_info)
2921 Elf_Internal_Sym *isym;
2923 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2926 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2927 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2928 && irel->r_offset >= 2
2929 && bfd_get_8 (input_bfd,
2930 contents + irel->r_offset - 2) == 0x8b)
2932 bfd_put_8 (output_bfd, 0x8d,
2933 contents + irel->r_offset - 2);
2934 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2935 if (local_got_refcounts != NULL
2936 && local_got_refcounts[r_symndx] > 0)
2937 local_got_refcounts[r_symndx] -= 1;
2938 changed_contents = TRUE;
2939 changed_relocs = TRUE;
2944 indx = r_symndx - symtab_hdr->sh_info;
2945 h = elf_sym_hashes (abfd)[indx];
2946 BFD_ASSERT (h != NULL);
2948 while (h->root.type == bfd_link_hash_indirect
2949 || h->root.type == bfd_link_hash_warning)
2950 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2952 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2953 avoid optimizing _DYNAMIC since ld.so may use its link-time
2956 && h->type != STT_GNU_IFUNC
2957 && h != htab->elf.hdynamic
2958 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2959 && irel->r_offset >= 2
2960 && bfd_get_8 (input_bfd,
2961 contents + irel->r_offset - 2) == 0x8b)
2963 bfd_put_8 (output_bfd, 0x8d,
2964 contents + irel->r_offset - 2);
2965 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2966 if (h->got.refcount > 0)
2967 h->got.refcount -= 1;
2968 changed_contents = TRUE;
2969 changed_relocs = TRUE;
2973 if (contents != NULL
2974 && elf_section_data (sec)->this_hdr.contents != contents)
2976 if (!changed_contents && !link_info->keep_memory)
2980 /* Cache the section contents for elf_link_input_bfd. */
2981 elf_section_data (sec)->this_hdr.contents = contents;
2985 if (elf_section_data (sec)->relocs != internal_relocs)
2987 if (!changed_relocs)
2988 free (internal_relocs);
2990 elf_section_data (sec)->relocs = internal_relocs;
2996 if (contents != NULL
2997 && elf_section_data (sec)->this_hdr.contents != contents)
2999 if (internal_relocs != NULL
3000 && elf_section_data (sec)->relocs != internal_relocs)
3001 free (internal_relocs);
3005 /* Set the sizes of the dynamic sections. */
3008 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3009 struct bfd_link_info *info)
3011 struct elf_x86_64_link_hash_table *htab;
3016 const struct elf_backend_data *bed;
3018 htab = elf_x86_64_hash_table (info);
3021 bed = get_elf_backend_data (output_bfd);
3023 dynobj = htab->elf.dynobj;
3027 if (htab->elf.dynamic_sections_created)
3029 /* Set the contents of the .interp section to the interpreter. */
3030 if (info->executable)
3032 s = bfd_get_linker_section (dynobj, ".interp");
3035 s->size = htab->dynamic_interpreter_size;
3036 s->contents = (unsigned char *) htab->dynamic_interpreter;
3040 /* Set up .got offsets for local syms, and space for local dynamic
3042 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3044 bfd_signed_vma *local_got;
3045 bfd_signed_vma *end_local_got;
3046 char *local_tls_type;
3047 bfd_vma *local_tlsdesc_gotent;
3048 bfd_size_type locsymcount;
3049 Elf_Internal_Shdr *symtab_hdr;
3052 if (! is_x86_64_elf (ibfd))
3055 for (s = ibfd->sections; s != NULL; s = s->next)
3057 struct elf_dyn_relocs *p;
3059 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
3062 for (p = (struct elf_dyn_relocs *)
3063 (elf_section_data (s)->local_dynrel);
3067 if (!bfd_is_abs_section (p->sec)
3068 && bfd_is_abs_section (p->sec->output_section))
3070 /* Input section has been discarded, either because
3071 it is a copy of a linkonce section or due to
3072 linker script /DISCARD/, so we'll be discarding
3075 else if (p->count != 0)
3077 srel = elf_section_data (p->sec)->sreloc;
3078 srel->size += p->count * bed->s->sizeof_rela;
3079 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3080 && (info->flags & DF_TEXTREL) == 0)
3082 info->flags |= DF_TEXTREL;
3083 if (info->warn_shared_textrel && info->shared)
3084 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
3085 p->sec->owner, p->sec);
3091 local_got = elf_local_got_refcounts (ibfd);
3095 symtab_hdr = &elf_symtab_hdr (ibfd);
3096 locsymcount = symtab_hdr->sh_info;
3097 end_local_got = local_got + locsymcount;
3098 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3099 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3101 srel = htab->elf.srelgot;
3102 for (; local_got < end_local_got;
3103 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3105 *local_tlsdesc_gotent = (bfd_vma) -1;
3108 if (GOT_TLS_GDESC_P (*local_tls_type))
3110 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3111 - elf_x86_64_compute_jump_table_size (htab);
3112 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3113 *local_got = (bfd_vma) -2;
3115 if (! GOT_TLS_GDESC_P (*local_tls_type)
3116 || GOT_TLS_GD_P (*local_tls_type))
3118 *local_got = s->size;
3119 s->size += GOT_ENTRY_SIZE;
3120 if (GOT_TLS_GD_P (*local_tls_type))
3121 s->size += GOT_ENTRY_SIZE;
3124 || GOT_TLS_GD_ANY_P (*local_tls_type)
3125 || *local_tls_type == GOT_TLS_IE)
3127 if (GOT_TLS_GDESC_P (*local_tls_type))
3129 htab->elf.srelplt->size
3130 += bed->s->sizeof_rela;
3131 htab->tlsdesc_plt = (bfd_vma) -1;
3133 if (! GOT_TLS_GDESC_P (*local_tls_type)
3134 || GOT_TLS_GD_P (*local_tls_type))
3135 srel->size += bed->s->sizeof_rela;
3139 *local_got = (bfd_vma) -1;
3143 if (htab->tls_ld_got.refcount > 0)
3145 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3147 htab->tls_ld_got.offset = htab->elf.sgot->size;
3148 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3149 htab->elf.srelgot->size += bed->s->sizeof_rela;
3152 htab->tls_ld_got.offset = -1;
3154 /* Allocate global sym .plt and .got entries, and space for global
3155 sym dynamic relocs. */
3156 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3159 /* Allocate .plt and .got entries, and space for local symbols. */
3160 htab_traverse (htab->loc_hash_table,
3161 elf_x86_64_allocate_local_dynrelocs,
3164 /* For every jump slot reserved in the sgotplt, reloc_count is
3165 incremented. However, when we reserve space for TLS descriptors,
3166 it's not incremented, so in order to compute the space reserved
3167 for them, it suffices to multiply the reloc count by the jump
3170 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3171 so that R_X86_64_IRELATIVE entries come last. */
3172 if (htab->elf.srelplt)
3174 htab->sgotplt_jump_table_size
3175 = elf_x86_64_compute_jump_table_size (htab);
3176 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3178 else if (htab->elf.irelplt)
3179 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3181 if (htab->tlsdesc_plt)
3183 /* If we're not using lazy TLS relocations, don't generate the
3184 PLT and GOT entries they require. */
3185 if ((info->flags & DF_BIND_NOW))
3186 htab->tlsdesc_plt = 0;
3189 htab->tlsdesc_got = htab->elf.sgot->size;
3190 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3191 /* Reserve room for the initial entry.
3192 FIXME: we could probably do away with it in this case. */
3193 if (htab->elf.splt->size == 0)
3194 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3195 htab->tlsdesc_plt = htab->elf.splt->size;
3196 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3200 if (htab->elf.sgotplt)
3202 /* Don't allocate .got.plt section if there are no GOT nor PLT
3203 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3204 if ((htab->elf.hgot == NULL
3205 || !htab->elf.hgot->ref_regular_nonweak)
3206 && (htab->elf.sgotplt->size
3207 == get_elf_backend_data (output_bfd)->got_header_size)
3208 && (htab->elf.splt == NULL
3209 || htab->elf.splt->size == 0)
3210 && (htab->elf.sgot == NULL
3211 || htab->elf.sgot->size == 0)
3212 && (htab->elf.iplt == NULL
3213 || htab->elf.iplt->size == 0)
3214 && (htab->elf.igotplt == NULL
3215 || htab->elf.igotplt->size == 0))
3216 htab->elf.sgotplt->size = 0;
3219 if (htab->plt_eh_frame != NULL
3220 && htab->elf.splt != NULL
3221 && htab->elf.splt->size != 0
3222 && !bfd_is_abs_section (htab->elf.splt->output_section)
3223 && _bfd_elf_eh_frame_present (info))
3225 const struct elf_x86_64_backend_data *arch_data
3226 = get_elf_x86_64_arch_data (bed);
3227 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3230 /* We now have determined the sizes of the various dynamic sections.
3231 Allocate memory for them. */
3233 for (s = dynobj->sections; s != NULL; s = s->next)
3235 if ((s->flags & SEC_LINKER_CREATED) == 0)
3238 if (s == htab->elf.splt
3239 || s == htab->elf.sgot
3240 || s == htab->elf.sgotplt
3241 || s == htab->elf.iplt
3242 || s == htab->elf.igotplt
3243 || s == htab->plt_bnd
3244 || s == htab->plt_got
3245 || s == htab->plt_eh_frame
3246 || s == htab->sdynbss)
3248 /* Strip this section if we don't need it; see the
3251 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3253 if (s->size != 0 && s != htab->elf.srelplt)
3256 /* We use the reloc_count field as a counter if we need
3257 to copy relocs into the output file. */
3258 if (s != htab->elf.srelplt)
3263 /* It's not one of our sections, so don't allocate space. */
3269 /* If we don't need this section, strip it from the
3270 output file. This is mostly to handle .rela.bss and
3271 .rela.plt. We must create both sections in
3272 create_dynamic_sections, because they must be created
3273 before the linker maps input sections to output
3274 sections. The linker does that before
3275 adjust_dynamic_symbol is called, and it is that
3276 function which decides whether anything needs to go
3277 into these sections. */
3279 s->flags |= SEC_EXCLUDE;
3283 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3286 /* Allocate memory for the section contents. We use bfd_zalloc
3287 here in case unused entries are not reclaimed before the
3288 section's contents are written out. This should not happen,
3289 but this way if it does, we get a R_X86_64_NONE reloc instead
3291 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3292 if (s->contents == NULL)
3296 if (htab->plt_eh_frame != NULL
3297 && htab->plt_eh_frame->contents != NULL)
3299 const struct elf_x86_64_backend_data *arch_data
3300 = get_elf_x86_64_arch_data (bed);
3302 memcpy (htab->plt_eh_frame->contents,
3303 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3304 bfd_put_32 (dynobj, htab->elf.splt->size,
3305 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3308 if (htab->elf.dynamic_sections_created)
3310 /* Add some entries to the .dynamic section. We fill in the
3311 values later, in elf_x86_64_finish_dynamic_sections, but we
3312 must add the entries now so that we get the correct size for
3313 the .dynamic section. The DT_DEBUG entry is filled in by the
3314 dynamic linker and used by the debugger. */
3315 #define add_dynamic_entry(TAG, VAL) \
3316 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3318 if (info->executable)
3320 if (!add_dynamic_entry (DT_DEBUG, 0))
3324 if (htab->elf.splt->size != 0)
3326 if (!add_dynamic_entry (DT_PLTGOT, 0)
3327 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3328 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3329 || !add_dynamic_entry (DT_JMPREL, 0))
3332 if (htab->tlsdesc_plt
3333 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3334 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3340 if (!add_dynamic_entry (DT_RELA, 0)
3341 || !add_dynamic_entry (DT_RELASZ, 0)
3342 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3345 /* If any dynamic relocs apply to a read-only section,
3346 then we need a DT_TEXTREL entry. */
3347 if ((info->flags & DF_TEXTREL) == 0)
3348 elf_link_hash_traverse (&htab->elf,
3349 elf_x86_64_readonly_dynrelocs,
3352 if ((info->flags & DF_TEXTREL) != 0)
3354 if (!add_dynamic_entry (DT_TEXTREL, 0))
3359 #undef add_dynamic_entry
3365 elf_x86_64_always_size_sections (bfd *output_bfd,
3366 struct bfd_link_info *info)
3368 asection *tls_sec = elf_hash_table (info)->tls_sec;
3372 struct elf_link_hash_entry *tlsbase;
3374 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3375 "_TLS_MODULE_BASE_",
3376 FALSE, FALSE, FALSE);
3378 if (tlsbase && tlsbase->type == STT_TLS)
3380 struct elf_x86_64_link_hash_table *htab;
3381 struct bfd_link_hash_entry *bh = NULL;
3382 const struct elf_backend_data *bed
3383 = get_elf_backend_data (output_bfd);
3385 htab = elf_x86_64_hash_table (info);
3389 if (!(_bfd_generic_link_add_one_symbol
3390 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3391 tls_sec, 0, NULL, FALSE,
3392 bed->collect, &bh)))
3395 htab->tls_module_base = bh;
3397 tlsbase = (struct elf_link_hash_entry *)bh;
3398 tlsbase->def_regular = 1;
3399 tlsbase->other = STV_HIDDEN;
3400 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3407 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3408 executables. Rather than setting it to the beginning of the TLS
3409 section, we have to set it to the end. This function may be called
3410 multiple times, it is idempotent. */
3413 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3415 struct elf_x86_64_link_hash_table *htab;
3416 struct bfd_link_hash_entry *base;
3418 if (!info->executable)
3421 htab = elf_x86_64_hash_table (info);
3425 base = htab->tls_module_base;
3429 base->u.def.value = htab->elf.tls_size;
3432 /* Return the base VMA address which should be subtracted from real addresses
3433 when resolving @dtpoff relocation.
3434 This is PT_TLS segment p_vaddr. */
3437 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3439 /* If tls_sec is NULL, we should have signalled an error already. */
3440 if (elf_hash_table (info)->tls_sec == NULL)
3442 return elf_hash_table (info)->tls_sec->vma;
3445 /* Return the relocation value for @tpoff relocation
3446 if STT_TLS virtual address is ADDRESS. */
3449 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3451 struct elf_link_hash_table *htab = elf_hash_table (info);
3452 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3453 bfd_vma static_tls_size;
3455 /* If tls_segment is NULL, we should have signalled an error already. */
3456 if (htab->tls_sec == NULL)
3459 /* Consider special static TLS alignment requirements. */
3460 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3461 return address - static_tls_size - htab->tls_sec->vma;
3464 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3468 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3470 /* Opcode Instruction
3473 0x0f 0x8x conditional jump */
3475 && (contents [offset - 1] == 0xe8
3476 || contents [offset - 1] == 0xe9))
3478 && contents [offset - 2] == 0x0f
3479 && (contents [offset - 1] & 0xf0) == 0x80));
3482 /* Relocate an x86_64 ELF section. */
3485 elf_x86_64_relocate_section (bfd *output_bfd,
3486 struct bfd_link_info *info,
3488 asection *input_section,
3490 Elf_Internal_Rela *relocs,
3491 Elf_Internal_Sym *local_syms,
3492 asection **local_sections)
3494 struct elf_x86_64_link_hash_table *htab;
3495 Elf_Internal_Shdr *symtab_hdr;
3496 struct elf_link_hash_entry **sym_hashes;
3497 bfd_vma *local_got_offsets;
3498 bfd_vma *local_tlsdesc_gotents;
3499 Elf_Internal_Rela *rel;
3500 Elf_Internal_Rela *relend;
3501 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3503 BFD_ASSERT (is_x86_64_elf (input_bfd));
3505 htab = elf_x86_64_hash_table (info);
3508 symtab_hdr = &elf_symtab_hdr (input_bfd);
3509 sym_hashes = elf_sym_hashes (input_bfd);
3510 local_got_offsets = elf_local_got_offsets (input_bfd);
3511 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3513 elf_x86_64_set_tls_module_base (info);
3516 relend = relocs + input_section->reloc_count;
3517 for (; rel < relend; rel++)
3519 unsigned int r_type;
3520 reloc_howto_type *howto;
3521 unsigned long r_symndx;
3522 struct elf_link_hash_entry *h;
3523 struct elf_x86_64_link_hash_entry *eh;
3524 Elf_Internal_Sym *sym;
3526 bfd_vma off, offplt, plt_offset;
3528 bfd_boolean unresolved_reloc;
3529 bfd_reloc_status_type r;
3531 asection *base_got, *resolved_plt;
3534 r_type = ELF32_R_TYPE (rel->r_info);
3535 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3536 || r_type == (int) R_X86_64_GNU_VTENTRY)
3539 if (r_type >= (int) R_X86_64_standard)
3541 (*_bfd_error_handler)
3542 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3543 input_bfd, input_section, r_type);
3544 bfd_set_error (bfd_error_bad_value);
3548 if (r_type != (int) R_X86_64_32
3549 || ABI_64_P (output_bfd))
3550 howto = x86_64_elf_howto_table + r_type;
3552 howto = (x86_64_elf_howto_table
3553 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3554 r_symndx = htab->r_sym (rel->r_info);
3558 unresolved_reloc = FALSE;
3559 if (r_symndx < symtab_hdr->sh_info)
3561 sym = local_syms + r_symndx;
3562 sec = local_sections[r_symndx];
3564 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3566 st_size = sym->st_size;
3568 /* Relocate against local STT_GNU_IFUNC symbol. */
3569 if (!info->relocatable
3570 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3572 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3577 /* Set STT_GNU_IFUNC symbol value. */
3578 h->root.u.def.value = sym->st_value;
3579 h->root.u.def.section = sec;
3584 bfd_boolean warned ATTRIBUTE_UNUSED;
3585 bfd_boolean ignored ATTRIBUTE_UNUSED;
3587 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3588 r_symndx, symtab_hdr, sym_hashes,
3590 unresolved_reloc, warned, ignored);
3594 if (sec != NULL && discarded_section (sec))
3595 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3596 rel, 1, relend, howto, 0, contents);
3598 if (info->relocatable)
3601 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3603 if (r_type == R_X86_64_64)
3605 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3606 zero-extend it to 64bit if addend is zero. */
3607 r_type = R_X86_64_32;
3608 memset (contents + rel->r_offset + 4, 0, 4);
3610 else if (r_type == R_X86_64_SIZE64)
3612 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3613 zero-extend it to 64bit if addend is zero. */
3614 r_type = R_X86_64_SIZE32;
3615 memset (contents + rel->r_offset + 4, 0, 4);
3619 eh = (struct elf_x86_64_link_hash_entry *) h;
3621 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3622 it here if it is defined in a non-shared object. */
3624 && h->type == STT_GNU_IFUNC
3630 if ((input_section->flags & SEC_ALLOC) == 0
3631 || h->plt.offset == (bfd_vma) -1)
3634 /* STT_GNU_IFUNC symbol must go through PLT. */
3635 if (htab->elf.splt != NULL)
3637 if (htab->plt_bnd != NULL)
3639 resolved_plt = htab->plt_bnd;
3640 plt_offset = eh->plt_bnd.offset;
3644 resolved_plt = htab->elf.splt;
3645 plt_offset = h->plt.offset;
3650 resolved_plt = htab->elf.iplt;
3651 plt_offset = h->plt.offset;
3654 relocation = (resolved_plt->output_section->vma
3655 + resolved_plt->output_offset + plt_offset);
3660 if (h->root.root.string)
3661 name = h->root.root.string;
3663 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3665 (*_bfd_error_handler)
3666 (_("%B: relocation %s against STT_GNU_IFUNC "
3667 "symbol `%s' isn't handled by %s"), input_bfd,
3668 x86_64_elf_howto_table[r_type].name,
3669 name, __FUNCTION__);
3670 bfd_set_error (bfd_error_bad_value);
3679 if (ABI_64_P (output_bfd))
3683 if (rel->r_addend != 0)
3685 if (h->root.root.string)
3686 name = h->root.root.string;
3688 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3690 (*_bfd_error_handler)
3691 (_("%B: relocation %s against STT_GNU_IFUNC "
3692 "symbol `%s' has non-zero addend: %d"),
3693 input_bfd, x86_64_elf_howto_table[r_type].name,
3694 name, rel->r_addend);
3695 bfd_set_error (bfd_error_bad_value);
3699 /* Generate dynamic relcoation only when there is a
3700 non-GOT reference in a shared object. */
3701 if (info->shared && h->non_got_ref)
3703 Elf_Internal_Rela outrel;
3706 /* Need a dynamic relocation to get the real function
3708 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3712 if (outrel.r_offset == (bfd_vma) -1
3713 || outrel.r_offset == (bfd_vma) -2)
3716 outrel.r_offset += (input_section->output_section->vma
3717 + input_section->output_offset);
3719 if (h->dynindx == -1
3721 || info->executable)
3723 /* This symbol is resolved locally. */
3724 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3725 outrel.r_addend = (h->root.u.def.value
3726 + h->root.u.def.section->output_section->vma
3727 + h->root.u.def.section->output_offset);
3731 outrel.r_info = htab->r_info (h->dynindx, r_type);
3732 outrel.r_addend = 0;
3735 sreloc = htab->elf.irelifunc;
3736 elf_append_rela (output_bfd, sreloc, &outrel);
3738 /* If this reloc is against an external symbol, we
3739 do not want to fiddle with the addend. Otherwise,
3740 we need to include the symbol value so that it
3741 becomes an addend for the dynamic reloc. For an
3742 internal symbol, we have updated addend. */
3747 case R_X86_64_PC32_BND:
3749 case R_X86_64_PLT32:
3750 case R_X86_64_PLT32_BND:
3753 case R_X86_64_GOTPCREL:
3754 case R_X86_64_GOTPCREL64:
3755 base_got = htab->elf.sgot;
3756 off = h->got.offset;
3758 if (base_got == NULL)
3761 if (off == (bfd_vma) -1)
3763 /* We can't use h->got.offset here to save state, or
3764 even just remember the offset, as finish_dynamic_symbol
3765 would use that as offset into .got. */
3767 if (htab->elf.splt != NULL)
3769 plt_index = h->plt.offset / plt_entry_size - 1;
3770 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3771 base_got = htab->elf.sgotplt;
3775 plt_index = h->plt.offset / plt_entry_size;
3776 off = plt_index * GOT_ENTRY_SIZE;
3777 base_got = htab->elf.igotplt;
3780 if (h->dynindx == -1
3784 /* This references the local defitionion. We must
3785 initialize this entry in the global offset table.
3786 Since the offset must always be a multiple of 8,
3787 we use the least significant bit to record
3788 whether we have initialized it already.
3790 When doing a dynamic link, we create a .rela.got
3791 relocation entry to initialize the value. This
3792 is done in the finish_dynamic_symbol routine. */
3797 bfd_put_64 (output_bfd, relocation,
3798 base_got->contents + off);
3799 /* Note that this is harmless for the GOTPLT64
3800 case, as -1 | 1 still is -1. */
3806 relocation = (base_got->output_section->vma
3807 + base_got->output_offset + off);
3813 /* When generating a shared object, the relocations handled here are
3814 copied into the output file to be resolved at run time. */
3817 case R_X86_64_GOT32:
3818 case R_X86_64_GOT64:
3819 /* Relocation is to the entry for this symbol in the global
3821 case R_X86_64_GOTPCREL:
3822 case R_X86_64_GOTPCREL64:
3823 /* Use global offset table entry as symbol value. */
3824 case R_X86_64_GOTPLT64:
3825 /* This is obsolete and treated the the same as GOT64. */
3826 base_got = htab->elf.sgot;
3828 if (htab->elf.sgot == NULL)
3835 off = h->got.offset;
3837 && h->plt.offset != (bfd_vma)-1
3838 && off == (bfd_vma)-1)
3840 /* We can't use h->got.offset here to save
3841 state, or even just remember the offset, as
3842 finish_dynamic_symbol would use that as offset into
3844 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3845 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3846 base_got = htab->elf.sgotplt;
3849 dyn = htab->elf.dynamic_sections_created;
3851 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3853 && SYMBOL_REFERENCES_LOCAL (info, h))
3854 || (ELF_ST_VISIBILITY (h->other)
3855 && h->root.type == bfd_link_hash_undefweak))
3857 /* This is actually a static link, or it is a -Bsymbolic
3858 link and the symbol is defined locally, or the symbol
3859 was forced to be local because of a version file. We
3860 must initialize this entry in the global offset table.
3861 Since the offset must always be a multiple of 8, we
3862 use the least significant bit to record whether we
3863 have initialized it already.
3865 When doing a dynamic link, we create a .rela.got
3866 relocation entry to initialize the value. This is
3867 done in the finish_dynamic_symbol routine. */
3872 bfd_put_64 (output_bfd, relocation,
3873 base_got->contents + off);
3874 /* Note that this is harmless for the GOTPLT64 case,
3875 as -1 | 1 still is -1. */
3880 unresolved_reloc = FALSE;
3884 if (local_got_offsets == NULL)
3887 off = local_got_offsets[r_symndx];
3889 /* The offset must always be a multiple of 8. We use
3890 the least significant bit to record whether we have
3891 already generated the necessary reloc. */
3896 bfd_put_64 (output_bfd, relocation,
3897 base_got->contents + off);
3902 Elf_Internal_Rela outrel;
3904 /* We need to generate a R_X86_64_RELATIVE reloc
3905 for the dynamic linker. */
3906 s = htab->elf.srelgot;
3910 outrel.r_offset = (base_got->output_section->vma
3911 + base_got->output_offset
3913 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3914 outrel.r_addend = relocation;
3915 elf_append_rela (output_bfd, s, &outrel);
3918 local_got_offsets[r_symndx] |= 1;
3922 if (off >= (bfd_vma) -2)
3925 relocation = base_got->output_section->vma
3926 + base_got->output_offset + off;
3927 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3928 relocation -= htab->elf.sgotplt->output_section->vma
3929 - htab->elf.sgotplt->output_offset;
3933 case R_X86_64_GOTOFF64:
3934 /* Relocation is relative to the start of the global offset
3937 /* Check to make sure it isn't a protected function symbol
3938 for shared library since it may not be local when used
3939 as function address. */
3940 if (!info->executable
3942 && !SYMBOLIC_BIND (info, h)
3944 && h->type == STT_FUNC
3945 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3947 (*_bfd_error_handler)
3948 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3949 input_bfd, h->root.root.string);
3950 bfd_set_error (bfd_error_bad_value);
3954 /* Note that sgot is not involved in this
3955 calculation. We always want the start of .got.plt. If we
3956 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3957 permitted by the ABI, we might have to change this
3959 relocation -= htab->elf.sgotplt->output_section->vma
3960 + htab->elf.sgotplt->output_offset;
3963 case R_X86_64_GOTPC32:
3964 case R_X86_64_GOTPC64:
3965 /* Use global offset table as symbol value. */
3966 relocation = htab->elf.sgotplt->output_section->vma
3967 + htab->elf.sgotplt->output_offset;
3968 unresolved_reloc = FALSE;
3971 case R_X86_64_PLTOFF64:
3972 /* Relocation is PLT entry relative to GOT. For local
3973 symbols it's the symbol itself relative to GOT. */
3975 /* See PLT32 handling. */
3976 && h->plt.offset != (bfd_vma) -1
3977 && htab->elf.splt != NULL)
3979 if (htab->plt_bnd != NULL)
3981 resolved_plt = htab->plt_bnd;
3982 plt_offset = eh->plt_bnd.offset;
3986 resolved_plt = htab->elf.splt;
3987 plt_offset = h->plt.offset;
3990 relocation = (resolved_plt->output_section->vma
3991 + resolved_plt->output_offset
3993 unresolved_reloc = FALSE;
3996 relocation -= htab->elf.sgotplt->output_section->vma
3997 + htab->elf.sgotplt->output_offset;
4000 case R_X86_64_PLT32:
4001 case R_X86_64_PLT32_BND:
4002 /* Relocation is to the entry for this symbol in the
4003 procedure linkage table. */
4005 /* Resolve a PLT32 reloc against a local symbol directly,
4006 without using the procedure linkage table. */
4010 if ((h->plt.offset == (bfd_vma) -1
4011 && eh->plt_got.offset == (bfd_vma) -1)
4012 || htab->elf.splt == NULL)
4014 /* We didn't make a PLT entry for this symbol. This
4015 happens when statically linking PIC code, or when
4016 using -Bsymbolic. */
4020 if (h->plt.offset != (bfd_vma) -1)
4022 if (htab->plt_bnd != NULL)
4024 resolved_plt = htab->plt_bnd;
4025 plt_offset = eh->plt_bnd.offset;
4029 resolved_plt = htab->elf.splt;
4030 plt_offset = h->plt.offset;
4035 /* Use the GOT PLT. */
4036 resolved_plt = htab->plt_got;
4037 plt_offset = eh->plt_got.offset;
4040 relocation = (resolved_plt->output_section->vma
4041 + resolved_plt->output_offset
4043 unresolved_reloc = FALSE;
4046 case R_X86_64_SIZE32:
4047 case R_X86_64_SIZE64:
4048 /* Set to symbol size. */
4049 relocation = st_size;
4055 case R_X86_64_PC32_BND:
4057 && (input_section->flags & SEC_ALLOC) != 0
4058 && (input_section->flags & SEC_READONLY) != 0
4061 bfd_boolean fail = FALSE;
4063 = ((r_type == R_X86_64_PC32
4064 || r_type == R_X86_64_PC32_BND)
4065 && is_32bit_relative_branch (contents, rel->r_offset));
4067 if (SYMBOL_REFERENCES_LOCAL (info, h))
4069 /* Symbol is referenced locally. Make sure it is
4070 defined locally or for a branch. */
4071 fail = !h->def_regular && !branch;
4073 else if (!(info->executable
4074 && (h->needs_copy || eh->needs_copy)))
4076 /* Symbol doesn't need copy reloc and isn't referenced
4077 locally. We only allow branch to symbol with
4078 non-default visibility. */
4080 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4087 const char *pic = "";
4089 switch (ELF_ST_VISIBILITY (h->other))
4092 v = _("hidden symbol");
4095 v = _("internal symbol");
4098 v = _("protected symbol");
4102 pic = _("; recompile with -fPIC");
4107 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4109 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4111 (*_bfd_error_handler) (fmt, input_bfd,
4112 x86_64_elf_howto_table[r_type].name,
4113 v, h->root.root.string, pic);
4114 bfd_set_error (bfd_error_bad_value);
4125 /* FIXME: The ABI says the linker should make sure the value is
4126 the same when it's zeroextended to 64 bit. */
4129 if ((input_section->flags & SEC_ALLOC) == 0)
4132 /* Don't copy a pc-relative relocation into the output file
4133 if the symbol needs copy reloc. */
4135 && !(info->executable
4137 && (h->needs_copy || eh->needs_copy)
4138 && IS_X86_64_PCREL_TYPE (r_type))
4140 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4141 || h->root.type != bfd_link_hash_undefweak)
4142 && ((! IS_X86_64_PCREL_TYPE (r_type)
4143 && r_type != R_X86_64_SIZE32
4144 && r_type != R_X86_64_SIZE64)
4145 || ! SYMBOL_CALLS_LOCAL (info, h)))
4146 || (ELIMINATE_COPY_RELOCS
4153 || h->root.type == bfd_link_hash_undefweak
4154 || h->root.type == bfd_link_hash_undefined)))
4156 Elf_Internal_Rela outrel;
4157 bfd_boolean skip, relocate;
4160 /* When generating a shared object, these relocations
4161 are copied into the output file to be resolved at run
4167 _bfd_elf_section_offset (output_bfd, info, input_section,
4169 if (outrel.r_offset == (bfd_vma) -1)
4171 else if (outrel.r_offset == (bfd_vma) -2)
4172 skip = TRUE, relocate = TRUE;
4174 outrel.r_offset += (input_section->output_section->vma
4175 + input_section->output_offset);
4178 memset (&outrel, 0, sizeof outrel);
4180 /* h->dynindx may be -1 if this symbol was marked to
4184 && (IS_X86_64_PCREL_TYPE (r_type)
4186 || ! SYMBOLIC_BIND (info, h)
4187 || ! h->def_regular))
4189 outrel.r_info = htab->r_info (h->dynindx, r_type);
4190 outrel.r_addend = rel->r_addend;
4194 /* This symbol is local, or marked to become local. */
4195 if (r_type == htab->pointer_r_type)
4198 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4199 outrel.r_addend = relocation + rel->r_addend;
4201 else if (r_type == R_X86_64_64
4202 && !ABI_64_P (output_bfd))
4205 outrel.r_info = htab->r_info (0,
4206 R_X86_64_RELATIVE64);
4207 outrel.r_addend = relocation + rel->r_addend;
4208 /* Check addend overflow. */
4209 if ((outrel.r_addend & 0x80000000)
4210 != (rel->r_addend & 0x80000000))
4213 int addend = rel->r_addend;
4214 if (h && h->root.root.string)
4215 name = h->root.root.string;
4217 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4220 (*_bfd_error_handler)
4221 (_("%B: addend -0x%x in relocation %s against "
4222 "symbol `%s' at 0x%lx in section `%A' is "
4224 input_bfd, input_section, addend,
4225 x86_64_elf_howto_table[r_type].name,
4226 name, (unsigned long) rel->r_offset);
4228 (*_bfd_error_handler)
4229 (_("%B: addend 0x%x in relocation %s against "
4230 "symbol `%s' at 0x%lx in section `%A' is "
4232 input_bfd, input_section, addend,
4233 x86_64_elf_howto_table[r_type].name,
4234 name, (unsigned long) rel->r_offset);
4235 bfd_set_error (bfd_error_bad_value);
4243 if (bfd_is_abs_section (sec))
4245 else if (sec == NULL || sec->owner == NULL)
4247 bfd_set_error (bfd_error_bad_value);
4254 /* We are turning this relocation into one
4255 against a section symbol. It would be
4256 proper to subtract the symbol's value,
4257 osec->vma, from the emitted reloc addend,
4258 but ld.so expects buggy relocs. */
4259 osec = sec->output_section;
4260 sindx = elf_section_data (osec)->dynindx;
4263 asection *oi = htab->elf.text_index_section;
4264 sindx = elf_section_data (oi)->dynindx;
4266 BFD_ASSERT (sindx != 0);
4269 outrel.r_info = htab->r_info (sindx, r_type);
4270 outrel.r_addend = relocation + rel->r_addend;
4274 sreloc = elf_section_data (input_section)->sreloc;
4276 if (sreloc == NULL || sreloc->contents == NULL)
4278 r = bfd_reloc_notsupported;
4279 goto check_relocation_error;
4282 elf_append_rela (output_bfd, sreloc, &outrel);
4284 /* If this reloc is against an external symbol, we do
4285 not want to fiddle with the addend. Otherwise, we
4286 need to include the symbol value so that it becomes
4287 an addend for the dynamic reloc. */
4294 case R_X86_64_TLSGD:
4295 case R_X86_64_GOTPC32_TLSDESC:
4296 case R_X86_64_TLSDESC_CALL:
4297 case R_X86_64_GOTTPOFF:
4298 tls_type = GOT_UNKNOWN;
4299 if (h == NULL && local_got_offsets)
4300 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4302 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4304 if (! elf_x86_64_tls_transition (info, input_bfd,
4305 input_section, contents,
4306 symtab_hdr, sym_hashes,
4307 &r_type, tls_type, rel,
4308 relend, h, r_symndx))
4311 if (r_type == R_X86_64_TPOFF32)
4313 bfd_vma roff = rel->r_offset;
4315 BFD_ASSERT (! unresolved_reloc);
4317 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4319 /* GD->LE transition. For 64bit, change
4320 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4321 .word 0x6666; rex64; call __tls_get_addr
4324 leaq foo@tpoff(%rax), %rax
4326 leaq foo@tlsgd(%rip), %rdi
4327 .word 0x6666; rex64; call __tls_get_addr
4330 leaq foo@tpoff(%rax), %rax
4331 For largepic, change:
4332 leaq foo@tlsgd(%rip), %rdi
4333 movabsq $__tls_get_addr@pltoff, %rax
4338 leaq foo@tpoff(%rax), %rax
4339 nopw 0x0(%rax,%rax,1) */
4341 if (ABI_64_P (output_bfd)
4342 && contents[roff + 5] == (bfd_byte) '\xb8')
4344 memcpy (contents + roff - 3,
4345 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4346 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4349 else if (ABI_64_P (output_bfd))
4350 memcpy (contents + roff - 4,
4351 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4354 memcpy (contents + roff - 3,
4355 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4357 bfd_put_32 (output_bfd,
4358 elf_x86_64_tpoff (info, relocation),
4359 contents + roff + 8 + largepic);
4360 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4364 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4366 /* GDesc -> LE transition.
4367 It's originally something like:
4368 leaq x@tlsdesc(%rip), %rax
4371 movl $x@tpoff, %rax. */
4373 unsigned int val, type;
4375 type = bfd_get_8 (input_bfd, contents + roff - 3);
4376 val = bfd_get_8 (input_bfd, contents + roff - 1);
4377 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4378 contents + roff - 3);
4379 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4380 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4381 contents + roff - 1);
4382 bfd_put_32 (output_bfd,
4383 elf_x86_64_tpoff (info, relocation),
4387 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4389 /* GDesc -> LE transition.
4394 bfd_put_8 (output_bfd, 0x66, contents + roff);
4395 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4398 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4400 /* IE->LE transition:
4401 For 64bit, originally it can be one of:
4402 movq foo@gottpoff(%rip), %reg
4403 addq foo@gottpoff(%rip), %reg
4406 leaq foo(%reg), %reg
4408 For 32bit, originally it can be one of:
4409 movq foo@gottpoff(%rip), %reg
4410 addl foo@gottpoff(%rip), %reg
4413 leal foo(%reg), %reg
4416 unsigned int val, type, reg;
4419 val = bfd_get_8 (input_bfd, contents + roff - 3);
4422 type = bfd_get_8 (input_bfd, contents + roff - 2);
4423 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4429 bfd_put_8 (output_bfd, 0x49,
4430 contents + roff - 3);
4431 else if (!ABI_64_P (output_bfd) && val == 0x44)
4432 bfd_put_8 (output_bfd, 0x41,
4433 contents + roff - 3);
4434 bfd_put_8 (output_bfd, 0xc7,
4435 contents + roff - 2);
4436 bfd_put_8 (output_bfd, 0xc0 | reg,
4437 contents + roff - 1);
4441 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4444 bfd_put_8 (output_bfd, 0x49,
4445 contents + roff - 3);
4446 else if (!ABI_64_P (output_bfd) && val == 0x44)
4447 bfd_put_8 (output_bfd, 0x41,
4448 contents + roff - 3);
4449 bfd_put_8 (output_bfd, 0x81,
4450 contents + roff - 2);
4451 bfd_put_8 (output_bfd, 0xc0 | reg,
4452 contents + roff - 1);
4456 /* addq/addl -> leaq/leal */
4458 bfd_put_8 (output_bfd, 0x4d,
4459 contents + roff - 3);
4460 else if (!ABI_64_P (output_bfd) && val == 0x44)
4461 bfd_put_8 (output_bfd, 0x45,
4462 contents + roff - 3);
4463 bfd_put_8 (output_bfd, 0x8d,
4464 contents + roff - 2);
4465 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4466 contents + roff - 1);
4468 bfd_put_32 (output_bfd,
4469 elf_x86_64_tpoff (info, relocation),
4477 if (htab->elf.sgot == NULL)
4482 off = h->got.offset;
4483 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4487 if (local_got_offsets == NULL)
4490 off = local_got_offsets[r_symndx];
4491 offplt = local_tlsdesc_gotents[r_symndx];
4498 Elf_Internal_Rela outrel;
4502 if (htab->elf.srelgot == NULL)
4505 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4507 if (GOT_TLS_GDESC_P (tls_type))
4509 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4510 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4511 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4512 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4513 + htab->elf.sgotplt->output_offset
4515 + htab->sgotplt_jump_table_size);
4516 sreloc = htab->elf.srelplt;
4518 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4520 outrel.r_addend = 0;
4521 elf_append_rela (output_bfd, sreloc, &outrel);
4524 sreloc = htab->elf.srelgot;
4526 outrel.r_offset = (htab->elf.sgot->output_section->vma
4527 + htab->elf.sgot->output_offset + off);
4529 if (GOT_TLS_GD_P (tls_type))
4530 dr_type = R_X86_64_DTPMOD64;
4531 else if (GOT_TLS_GDESC_P (tls_type))
4534 dr_type = R_X86_64_TPOFF64;
4536 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4537 outrel.r_addend = 0;
4538 if ((dr_type == R_X86_64_TPOFF64
4539 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4540 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4541 outrel.r_info = htab->r_info (indx, dr_type);
4543 elf_append_rela (output_bfd, sreloc, &outrel);
4545 if (GOT_TLS_GD_P (tls_type))
4549 BFD_ASSERT (! unresolved_reloc);
4550 bfd_put_64 (output_bfd,
4551 relocation - elf_x86_64_dtpoff_base (info),
4552 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4556 bfd_put_64 (output_bfd, 0,
4557 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4558 outrel.r_info = htab->r_info (indx,
4560 outrel.r_offset += GOT_ENTRY_SIZE;
4561 elf_append_rela (output_bfd, sreloc,
4570 local_got_offsets[r_symndx] |= 1;
4573 if (off >= (bfd_vma) -2
4574 && ! GOT_TLS_GDESC_P (tls_type))
4576 if (r_type == ELF32_R_TYPE (rel->r_info))
4578 if (r_type == R_X86_64_GOTPC32_TLSDESC
4579 || r_type == R_X86_64_TLSDESC_CALL)
4580 relocation = htab->elf.sgotplt->output_section->vma
4581 + htab->elf.sgotplt->output_offset
4582 + offplt + htab->sgotplt_jump_table_size;
4584 relocation = htab->elf.sgot->output_section->vma
4585 + htab->elf.sgot->output_offset + off;
4586 unresolved_reloc = FALSE;
4590 bfd_vma roff = rel->r_offset;
4592 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4594 /* GD->IE transition. For 64bit, change
4595 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4596 .word 0x6666; rex64; call __tls_get_addr@plt
4599 addq foo@gottpoff(%rip), %rax
4601 leaq foo@tlsgd(%rip), %rdi
4602 .word 0x6666; rex64; call __tls_get_addr@plt
4605 addq foo@gottpoff(%rip), %rax
4606 For largepic, change:
4607 leaq foo@tlsgd(%rip), %rdi
4608 movabsq $__tls_get_addr@pltoff, %rax
4613 addq foo@gottpoff(%rax), %rax
4614 nopw 0x0(%rax,%rax,1) */
4616 if (ABI_64_P (output_bfd)
4617 && contents[roff + 5] == (bfd_byte) '\xb8')
4619 memcpy (contents + roff - 3,
4620 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4621 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4624 else if (ABI_64_P (output_bfd))
4625 memcpy (contents + roff - 4,
4626 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4629 memcpy (contents + roff - 3,
4630 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4633 relocation = (htab->elf.sgot->output_section->vma
4634 + htab->elf.sgot->output_offset + off
4637 - input_section->output_section->vma
4638 - input_section->output_offset
4640 bfd_put_32 (output_bfd, relocation,
4641 contents + roff + 8 + largepic);
4642 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4646 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4648 /* GDesc -> IE transition.
4649 It's originally something like:
4650 leaq x@tlsdesc(%rip), %rax
4653 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4655 /* Now modify the instruction as appropriate. To
4656 turn a leaq into a movq in the form we use it, it
4657 suffices to change the second byte from 0x8d to
4659 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4661 bfd_put_32 (output_bfd,
4662 htab->elf.sgot->output_section->vma
4663 + htab->elf.sgot->output_offset + off
4665 - input_section->output_section->vma
4666 - input_section->output_offset
4671 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4673 /* GDesc -> IE transition.
4680 bfd_put_8 (output_bfd, 0x66, contents + roff);
4681 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4689 case R_X86_64_TLSLD:
4690 if (! elf_x86_64_tls_transition (info, input_bfd,
4691 input_section, contents,
4692 symtab_hdr, sym_hashes,
4693 &r_type, GOT_UNKNOWN,
4694 rel, relend, h, r_symndx))
4697 if (r_type != R_X86_64_TLSLD)
4699 /* LD->LE transition:
4700 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4701 For 64bit, we change it into:
4702 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4703 For 32bit, we change it into:
4704 nopl 0x0(%rax); movl %fs:0, %eax.
4705 For largepic, change:
4706 leaq foo@tlsgd(%rip), %rdi
4707 movabsq $__tls_get_addr@pltoff, %rax
4711 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4714 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4715 if (ABI_64_P (output_bfd)
4716 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
4717 memcpy (contents + rel->r_offset - 3,
4718 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4719 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4720 else if (ABI_64_P (output_bfd))
4721 memcpy (contents + rel->r_offset - 3,
4722 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4724 memcpy (contents + rel->r_offset - 3,
4725 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4726 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4731 if (htab->elf.sgot == NULL)
4734 off = htab->tls_ld_got.offset;
4739 Elf_Internal_Rela outrel;
4741 if (htab->elf.srelgot == NULL)
4744 outrel.r_offset = (htab->elf.sgot->output_section->vma
4745 + htab->elf.sgot->output_offset + off);
4747 bfd_put_64 (output_bfd, 0,
4748 htab->elf.sgot->contents + off);
4749 bfd_put_64 (output_bfd, 0,
4750 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4751 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4752 outrel.r_addend = 0;
4753 elf_append_rela (output_bfd, htab->elf.srelgot,
4755 htab->tls_ld_got.offset |= 1;
4757 relocation = htab->elf.sgot->output_section->vma
4758 + htab->elf.sgot->output_offset + off;
4759 unresolved_reloc = FALSE;
4762 case R_X86_64_DTPOFF32:
4763 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4764 relocation -= elf_x86_64_dtpoff_base (info);
4766 relocation = elf_x86_64_tpoff (info, relocation);
4769 case R_X86_64_TPOFF32:
4770 case R_X86_64_TPOFF64:
4771 BFD_ASSERT (info->executable);
4772 relocation = elf_x86_64_tpoff (info, relocation);
4775 case R_X86_64_DTPOFF64:
4776 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4777 relocation -= elf_x86_64_dtpoff_base (info);
4784 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4785 because such sections are not SEC_ALLOC and thus ld.so will
4786 not process them. */
4787 if (unresolved_reloc
4788 && !((input_section->flags & SEC_DEBUGGING) != 0
4790 && _bfd_elf_section_offset (output_bfd, info, input_section,
4791 rel->r_offset) != (bfd_vma) -1)
4793 (*_bfd_error_handler)
4794 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4797 (long) rel->r_offset,
4799 h->root.root.string);
4804 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4805 contents, rel->r_offset,
4806 relocation, rel->r_addend);
4808 check_relocation_error:
4809 if (r != bfd_reloc_ok)
4814 name = h->root.root.string;
4817 name = bfd_elf_string_from_elf_section (input_bfd,
4818 symtab_hdr->sh_link,
4823 name = bfd_section_name (input_bfd, sec);
4826 if (r == bfd_reloc_overflow)
4828 if (! ((*info->callbacks->reloc_overflow)
4829 (info, (h ? &h->root : NULL), name, howto->name,
4830 (bfd_vma) 0, input_bfd, input_section,
4836 (*_bfd_error_handler)
4837 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4838 input_bfd, input_section,
4839 (long) rel->r_offset, name, (int) r);
4848 /* Finish up dynamic symbol handling. We set the contents of various
4849 dynamic sections here. */
4852 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4853 struct bfd_link_info *info,
4854 struct elf_link_hash_entry *h,
4855 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4857 struct elf_x86_64_link_hash_table *htab;
4858 const struct elf_x86_64_backend_data *abed;
4859 bfd_boolean use_plt_bnd;
4860 struct elf_x86_64_link_hash_entry *eh;
4862 htab = elf_x86_64_hash_table (info);
4866 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
4867 section only if there is .plt section. */
4868 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
4870 ? &elf_x86_64_bnd_arch_bed
4871 : get_elf_x86_64_backend_data (output_bfd));
4873 eh = (struct elf_x86_64_link_hash_entry *) h;
4875 if (h->plt.offset != (bfd_vma) -1)
4878 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
4879 bfd_vma plt_plt_insn_end, plt_got_insn_size;
4880 Elf_Internal_Rela rela;
4882 asection *plt, *gotplt, *relplt, *resolved_plt;
4883 const struct elf_backend_data *bed;
4884 bfd_vma plt_got_pcrel_offset;
4886 /* When building a static executable, use .iplt, .igot.plt and
4887 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4888 if (htab->elf.splt != NULL)
4890 plt = htab->elf.splt;
4891 gotplt = htab->elf.sgotplt;
4892 relplt = htab->elf.srelplt;
4896 plt = htab->elf.iplt;
4897 gotplt = htab->elf.igotplt;
4898 relplt = htab->elf.irelplt;
4901 /* This symbol has an entry in the procedure linkage table. Set
4903 if ((h->dynindx == -1
4904 && !((h->forced_local || info->executable)
4906 && h->type == STT_GNU_IFUNC))
4912 /* Get the index in the procedure linkage table which
4913 corresponds to this symbol. This is the index of this symbol
4914 in all the symbols for which we are making plt entries. The
4915 first entry in the procedure linkage table is reserved.
4917 Get the offset into the .got table of the entry that
4918 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4919 bytes. The first three are reserved for the dynamic linker.
4921 For static executables, we don't reserve anything. */
4923 if (plt == htab->elf.splt)
4925 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4926 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4930 got_offset = h->plt.offset / abed->plt_entry_size;
4931 got_offset = got_offset * GOT_ENTRY_SIZE;
4934 plt_plt_insn_end = abed->plt_plt_insn_end;
4935 plt_plt_offset = abed->plt_plt_offset;
4936 plt_got_insn_size = abed->plt_got_insn_size;
4937 plt_got_offset = abed->plt_got_offset;
4940 /* Use the second PLT with BND relocations. */
4941 const bfd_byte *plt_entry, *plt2_entry;
4943 if (eh->has_bnd_reloc)
4945 plt_entry = elf_x86_64_bnd_plt_entry;
4946 plt2_entry = elf_x86_64_bnd_plt2_entry;
4950 plt_entry = elf_x86_64_legacy_plt_entry;
4951 plt2_entry = elf_x86_64_legacy_plt2_entry;
4953 /* Subtract 1 since there is no BND prefix. */
4954 plt_plt_insn_end -= 1;
4955 plt_plt_offset -= 1;
4956 plt_got_insn_size -= 1;
4957 plt_got_offset -= 1;
4960 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
4961 == sizeof (elf_x86_64_legacy_plt_entry));
4963 /* Fill in the entry in the procedure linkage table. */
4964 memcpy (plt->contents + h->plt.offset,
4965 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
4966 /* Fill in the entry in the second PLT. */
4967 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
4968 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
4970 resolved_plt = htab->plt_bnd;
4971 plt_offset = eh->plt_bnd.offset;
4975 /* Fill in the entry in the procedure linkage table. */
4976 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4977 abed->plt_entry_size);
4980 plt_offset = h->plt.offset;
4983 /* Insert the relocation positions of the plt section. */
4985 /* Put offset the PC-relative instruction referring to the GOT entry,
4986 subtracting the size of that instruction. */
4987 plt_got_pcrel_offset = (gotplt->output_section->vma
4988 + gotplt->output_offset
4990 - resolved_plt->output_section->vma
4991 - resolved_plt->output_offset
4993 - plt_got_insn_size);
4995 /* Check PC-relative offset overflow in PLT entry. */
4996 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
4997 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
4998 output_bfd, h->root.root.string);
5000 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5001 resolved_plt->contents + plt_offset + plt_got_offset);
5003 /* Fill in the entry in the global offset table, initially this
5004 points to the second part of the PLT entry. */
5005 bfd_put_64 (output_bfd, (plt->output_section->vma
5006 + plt->output_offset
5007 + h->plt.offset + abed->plt_lazy_offset),
5008 gotplt->contents + got_offset);
5010 /* Fill in the entry in the .rela.plt section. */
5011 rela.r_offset = (gotplt->output_section->vma
5012 + gotplt->output_offset
5014 if (h->dynindx == -1
5015 || ((info->executable
5016 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5018 && h->type == STT_GNU_IFUNC))
5020 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5021 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5022 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5023 rela.r_addend = (h->root.u.def.value
5024 + h->root.u.def.section->output_section->vma
5025 + h->root.u.def.section->output_offset);
5026 /* R_X86_64_IRELATIVE comes last. */
5027 plt_index = htab->next_irelative_index--;
5031 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5033 plt_index = htab->next_jump_slot_index++;
5036 /* Don't fill PLT entry for static executables. */
5037 if (plt == htab->elf.splt)
5039 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5041 /* Put relocation index. */
5042 bfd_put_32 (output_bfd, plt_index,
5043 plt->contents + h->plt.offset + abed->plt_reloc_offset);
5045 /* Put offset for jmp .PLT0 and check for overflow. We don't
5046 check relocation index for overflow since branch displacement
5047 will overflow first. */
5048 if (plt0_offset > 0x80000000)
5049 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5050 output_bfd, h->root.root.string);
5051 bfd_put_32 (output_bfd, - plt0_offset,
5052 plt->contents + h->plt.offset + plt_plt_offset);
5055 bed = get_elf_backend_data (output_bfd);
5056 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5057 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5059 else if (eh->plt_got.offset != (bfd_vma) -1)
5061 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
5062 asection *plt, *got;
5063 bfd_boolean got_after_plt;
5064 int32_t got_pcrel_offset;
5065 const bfd_byte *got_plt_entry;
5067 /* Set the entry in the GOT procedure linkage table. */
5068 plt = htab->plt_got;
5069 got = htab->elf.sgot;
5070 got_offset = h->got.offset;
5072 if (got_offset == (bfd_vma) -1
5073 || h->type == STT_GNU_IFUNC
5078 /* Use the second PLT entry template for the GOT PLT since they
5079 are the identical. */
5080 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
5081 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
5082 if (eh->has_bnd_reloc)
5083 got_plt_entry = elf_x86_64_bnd_plt2_entry;
5086 got_plt_entry = elf_x86_64_legacy_plt2_entry;
5088 /* Subtract 1 since there is no BND prefix. */
5089 plt_got_insn_size -= 1;
5090 plt_got_offset -= 1;
5093 /* Fill in the entry in the GOT procedure linkage table. */
5094 plt_offset = eh->plt_got.offset;
5095 memcpy (plt->contents + plt_offset,
5096 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5098 /* Put offset the PC-relative instruction referring to the GOT
5099 entry, subtracting the size of that instruction. */
5100 got_pcrel_offset = (got->output_section->vma
5101 + got->output_offset
5103 - plt->output_section->vma
5104 - plt->output_offset
5106 - plt_got_insn_size);
5108 /* Check PC-relative offset overflow in GOT PLT entry. */
5109 got_after_plt = got->output_section->vma > plt->output_section->vma;
5110 if ((got_after_plt && got_pcrel_offset < 0)
5111 || (!got_after_plt && got_pcrel_offset > 0))
5112 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5113 output_bfd, h->root.root.string);
5115 bfd_put_32 (output_bfd, got_pcrel_offset,
5116 plt->contents + plt_offset + plt_got_offset);
5120 && (h->plt.offset != (bfd_vma) -1
5121 || eh->plt_got.offset != (bfd_vma) -1))
5123 /* Mark the symbol as undefined, rather than as defined in
5124 the .plt section. Leave the value if there were any
5125 relocations where pointer equality matters (this is a clue
5126 for the dynamic linker, to make function pointer
5127 comparisons work between an application and shared
5128 library), otherwise set it to zero. If a function is only
5129 called from a binary, there is no need to slow down
5130 shared libraries because of that. */
5131 sym->st_shndx = SHN_UNDEF;
5132 if (!h->pointer_equality_needed)
5136 if (h->got.offset != (bfd_vma) -1
5137 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
5138 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
5140 Elf_Internal_Rela rela;
5142 /* This symbol has an entry in the global offset table. Set it
5144 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5147 rela.r_offset = (htab->elf.sgot->output_section->vma
5148 + htab->elf.sgot->output_offset
5149 + (h->got.offset &~ (bfd_vma) 1));
5151 /* If this is a static link, or it is a -Bsymbolic link and the
5152 symbol is defined locally or was forced to be local because
5153 of a version file, we just want to emit a RELATIVE reloc.
5154 The entry in the global offset table will already have been
5155 initialized in the relocate_section function. */
5157 && h->type == STT_GNU_IFUNC)
5161 /* Generate R_X86_64_GLOB_DAT. */
5168 if (!h->pointer_equality_needed)
5171 /* For non-shared object, we can't use .got.plt, which
5172 contains the real function addres if we need pointer
5173 equality. We load the GOT entry with the PLT entry. */
5174 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5175 bfd_put_64 (output_bfd, (plt->output_section->vma
5176 + plt->output_offset
5178 htab->elf.sgot->contents + h->got.offset);
5182 else if (info->shared
5183 && SYMBOL_REFERENCES_LOCAL (info, h))
5185 if (!h->def_regular)
5187 BFD_ASSERT((h->got.offset & 1) != 0);
5188 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5189 rela.r_addend = (h->root.u.def.value
5190 + h->root.u.def.section->output_section->vma
5191 + h->root.u.def.section->output_offset);
5195 BFD_ASSERT((h->got.offset & 1) == 0);
5197 bfd_put_64 (output_bfd, (bfd_vma) 0,
5198 htab->elf.sgot->contents + h->got.offset);
5199 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5203 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5208 Elf_Internal_Rela rela;
5210 /* This symbol needs a copy reloc. Set it up. */
5212 if (h->dynindx == -1
5213 || (h->root.type != bfd_link_hash_defined
5214 && h->root.type != bfd_link_hash_defweak)
5215 || htab->srelbss == NULL)
5218 rela.r_offset = (h->root.u.def.value
5219 + h->root.u.def.section->output_section->vma
5220 + h->root.u.def.section->output_offset);
5221 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5223 elf_append_rela (output_bfd, htab->srelbss, &rela);
5229 /* Finish up local dynamic symbol handling. We set the contents of
5230 various dynamic sections here. */
5233 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5235 struct elf_link_hash_entry *h
5236 = (struct elf_link_hash_entry *) *slot;
5237 struct bfd_link_info *info
5238 = (struct bfd_link_info *) inf;
5240 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5244 /* Used to decide how to sort relocs in an optimal manner for the
5245 dynamic linker, before writing them out. */
5247 static enum elf_reloc_type_class
5248 elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
5249 const asection *rel_sec ATTRIBUTE_UNUSED,
5250 const Elf_Internal_Rela *rela)
5252 switch ((int) ELF32_R_TYPE (rela->r_info))
5254 case R_X86_64_RELATIVE:
5255 case R_X86_64_RELATIVE64:
5256 return reloc_class_relative;
5257 case R_X86_64_JUMP_SLOT:
5258 return reloc_class_plt;
5260 return reloc_class_copy;
5262 return reloc_class_normal;
5266 /* Finish up the dynamic sections. */
5269 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5270 struct bfd_link_info *info)
5272 struct elf_x86_64_link_hash_table *htab;
5275 const struct elf_x86_64_backend_data *abed;
5277 htab = elf_x86_64_hash_table (info);
5281 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5282 section only if there is .plt section. */
5283 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5284 ? &elf_x86_64_bnd_arch_bed
5285 : get_elf_x86_64_backend_data (output_bfd));
5287 dynobj = htab->elf.dynobj;
5288 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5290 if (htab->elf.dynamic_sections_created)
5292 bfd_byte *dyncon, *dynconend;
5293 const struct elf_backend_data *bed;
5294 bfd_size_type sizeof_dyn;
5296 if (sdyn == NULL || htab->elf.sgot == NULL)
5299 bed = get_elf_backend_data (dynobj);
5300 sizeof_dyn = bed->s->sizeof_dyn;
5301 dyncon = sdyn->contents;
5302 dynconend = sdyn->contents + sdyn->size;
5303 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5305 Elf_Internal_Dyn dyn;
5308 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5316 s = htab->elf.sgotplt;
5317 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5321 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5325 s = htab->elf.srelplt->output_section;
5326 dyn.d_un.d_val = s->size;
5330 /* The procedure linkage table relocs (DT_JMPREL) should
5331 not be included in the overall relocs (DT_RELA).
5332 Therefore, we override the DT_RELASZ entry here to
5333 make it not include the JMPREL relocs. Since the
5334 linker script arranges for .rela.plt to follow all
5335 other relocation sections, we don't have to worry
5336 about changing the DT_RELA entry. */
5337 if (htab->elf.srelplt != NULL)
5339 s = htab->elf.srelplt->output_section;
5340 dyn.d_un.d_val -= s->size;
5344 case DT_TLSDESC_PLT:
5346 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5347 + htab->tlsdesc_plt;
5350 case DT_TLSDESC_GOT:
5352 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5353 + htab->tlsdesc_got;
5357 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5360 /* Fill in the special first entry in the procedure linkage table. */
5361 if (htab->elf.splt && htab->elf.splt->size > 0)
5363 /* Fill in the first entry in the procedure linkage table. */
5364 memcpy (htab->elf.splt->contents,
5365 abed->plt0_entry, abed->plt_entry_size);
5366 /* Add offset for pushq GOT+8(%rip), since the instruction
5367 uses 6 bytes subtract this value. */
5368 bfd_put_32 (output_bfd,
5369 (htab->elf.sgotplt->output_section->vma
5370 + htab->elf.sgotplt->output_offset
5372 - htab->elf.splt->output_section->vma
5373 - htab->elf.splt->output_offset
5375 htab->elf.splt->contents + abed->plt0_got1_offset);
5376 /* Add offset for the PC-relative instruction accessing GOT+16,
5377 subtracting the offset to the end of that instruction. */
5378 bfd_put_32 (output_bfd,
5379 (htab->elf.sgotplt->output_section->vma
5380 + htab->elf.sgotplt->output_offset
5382 - htab->elf.splt->output_section->vma
5383 - htab->elf.splt->output_offset
5384 - abed->plt0_got2_insn_end),
5385 htab->elf.splt->contents + abed->plt0_got2_offset);
5387 elf_section_data (htab->elf.splt->output_section)
5388 ->this_hdr.sh_entsize = abed->plt_entry_size;
5390 if (htab->tlsdesc_plt)
5392 bfd_put_64 (output_bfd, (bfd_vma) 0,
5393 htab->elf.sgot->contents + htab->tlsdesc_got);
5395 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5396 abed->plt0_entry, abed->plt_entry_size);
5398 /* Add offset for pushq GOT+8(%rip), since the
5399 instruction uses 6 bytes subtract this value. */
5400 bfd_put_32 (output_bfd,
5401 (htab->elf.sgotplt->output_section->vma
5402 + htab->elf.sgotplt->output_offset
5404 - htab->elf.splt->output_section->vma
5405 - htab->elf.splt->output_offset
5408 htab->elf.splt->contents
5409 + htab->tlsdesc_plt + abed->plt0_got1_offset);
5410 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5411 where TGD stands for htab->tlsdesc_got, subtracting the offset
5412 to the end of that instruction. */
5413 bfd_put_32 (output_bfd,
5414 (htab->elf.sgot->output_section->vma
5415 + htab->elf.sgot->output_offset
5417 - htab->elf.splt->output_section->vma
5418 - htab->elf.splt->output_offset
5420 - abed->plt0_got2_insn_end),
5421 htab->elf.splt->contents
5422 + htab->tlsdesc_plt + abed->plt0_got2_offset);
5427 if (htab->plt_bnd != NULL)
5428 elf_section_data (htab->plt_bnd->output_section)
5429 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
5431 if (htab->elf.sgotplt)
5433 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5435 (*_bfd_error_handler)
5436 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5440 /* Fill in the first three entries in the global offset table. */
5441 if (htab->elf.sgotplt->size > 0)
5443 /* Set the first entry in the global offset table to the address of
5444 the dynamic section. */
5446 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5448 bfd_put_64 (output_bfd,
5449 sdyn->output_section->vma + sdyn->output_offset,
5450 htab->elf.sgotplt->contents);
5451 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5452 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5453 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5456 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
5460 /* Adjust .eh_frame for .plt section. */
5461 if (htab->plt_eh_frame != NULL
5462 && htab->plt_eh_frame->contents != NULL)
5464 if (htab->elf.splt != NULL
5465 && htab->elf.splt->size != 0
5466 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5467 && htab->elf.splt->output_section != NULL
5468 && htab->plt_eh_frame->output_section != NULL)
5470 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5471 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5472 + htab->plt_eh_frame->output_offset
5473 + PLT_FDE_START_OFFSET;
5474 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5475 htab->plt_eh_frame->contents
5476 + PLT_FDE_START_OFFSET);
5478 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5480 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5482 htab->plt_eh_frame->contents))
5487 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5488 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5491 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5492 htab_traverse (htab->loc_hash_table,
5493 elf_x86_64_finish_local_dynamic_symbol,
5499 /* Return an array of PLT entry symbol values. */
5502 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5505 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5508 bfd_vma *plt_sym_val;
5510 bfd_byte *plt_contents;
5511 const struct elf_x86_64_backend_data *bed;
5512 Elf_Internal_Shdr *hdr;
5515 /* Get the .plt section contents. PLT passed down may point to the
5516 .plt.bnd section. Make sure that PLT always points to the .plt
5518 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
5523 plt = bfd_get_section_by_name (abfd, ".plt");
5526 bed = &elf_x86_64_bnd_arch_bed;
5529 bed = get_elf_x86_64_backend_data (abfd);
5531 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5532 if (plt_contents == NULL)
5534 if (!bfd_get_section_contents (abfd, (asection *) plt,
5535 plt_contents, 0, plt->size))
5538 free (plt_contents);
5542 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5543 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5546 hdr = &elf_section_data (relplt)->this_hdr;
5547 count = relplt->size / hdr->sh_entsize;
5549 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5550 if (plt_sym_val == NULL)
5553 for (i = 0; i < count; i++, p++)
5554 plt_sym_val[i] = -1;
5556 plt_offset = bed->plt_entry_size;
5557 p = relplt->relocation;
5558 for (i = 0; i < count; i++, p++)
5562 if (p->howto == NULL)
5565 if (p->howto->type != R_X86_64_JUMP_SLOT
5566 && p->howto->type != R_X86_64_IRELATIVE)
5569 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5570 + bed->plt_reloc_offset));
5571 if (reloc_index >= count)
5575 /* This is the index in .plt section. */
5576 long plt_index = plt_offset / bed->plt_entry_size;
5577 /* Store VMA + the offset in .plt.bnd section. */
5578 plt_sym_val[reloc_index] =
5580 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
5583 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5584 plt_offset += bed->plt_entry_size;
5587 free (plt_contents);
5592 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5596 elf_x86_64_get_synthetic_symtab (bfd *abfd,
5603 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5604 as PLT if it exists. */
5605 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
5607 plt = bfd_get_section_by_name (abfd, ".plt");
5608 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5609 dynsymcount, dynsyms, ret,
5611 elf_x86_64_get_plt_sym_val);
5614 /* Handle an x86-64 specific section when reading an object file. This
5615 is called when elfcode.h finds a section with an unknown type. */
5618 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5619 const char *name, int shindex)
5621 if (hdr->sh_type != SHT_X86_64_UNWIND)
5624 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5630 /* Hook called by the linker routine which adds symbols from an object
5631 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5635 elf_x86_64_add_symbol_hook (bfd *abfd,
5636 struct bfd_link_info *info,
5637 Elf_Internal_Sym *sym,
5638 const char **namep ATTRIBUTE_UNUSED,
5639 flagword *flagsp ATTRIBUTE_UNUSED,
5645 switch (sym->st_shndx)
5647 case SHN_X86_64_LCOMMON:
5648 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
5651 lcomm = bfd_make_section_with_flags (abfd,
5655 | SEC_LINKER_CREATED));
5658 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
5661 *valp = sym->st_size;
5665 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5666 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5667 && (abfd->flags & DYNAMIC) == 0
5668 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5669 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5675 /* Given a BFD section, try to locate the corresponding ELF section
5679 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
5680 asection *sec, int *index_return)
5682 if (sec == &_bfd_elf_large_com_section)
5684 *index_return = SHN_X86_64_LCOMMON;
5690 /* Process a symbol. */
5693 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5696 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5698 switch (elfsym->internal_elf_sym.st_shndx)
5700 case SHN_X86_64_LCOMMON:
5701 asym->section = &_bfd_elf_large_com_section;
5702 asym->value = elfsym->internal_elf_sym.st_size;
5703 /* Common symbol doesn't set BSF_GLOBAL. */
5704 asym->flags &= ~BSF_GLOBAL;
5710 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5712 return (sym->st_shndx == SHN_COMMON
5713 || sym->st_shndx == SHN_X86_64_LCOMMON);
5717 elf_x86_64_common_section_index (asection *sec)
5719 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5722 return SHN_X86_64_LCOMMON;
5726 elf_x86_64_common_section (asection *sec)
5728 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5729 return bfd_com_section_ptr;
5731 return &_bfd_elf_large_com_section;
5735 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
5736 const Elf_Internal_Sym *sym,
5741 const asection *oldsec)
5743 /* A normal common symbol and a large common symbol result in a
5744 normal common symbol. We turn the large common symbol into a
5747 && h->root.type == bfd_link_hash_common
5749 && bfd_is_com_section (*psec)
5752 if (sym->st_shndx == SHN_COMMON
5753 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
5755 h->root.u.c.p->section
5756 = bfd_make_section_old_way (oldbfd, "COMMON");
5757 h->root.u.c.p->section->flags = SEC_ALLOC;
5759 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5760 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
5761 *psec = bfd_com_section_ptr;
5768 elf_x86_64_additional_program_headers (bfd *abfd,
5769 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5774 /* Check to see if we need a large readonly segment. */
5775 s = bfd_get_section_by_name (abfd, ".lrodata");
5776 if (s && (s->flags & SEC_LOAD))
5779 /* Check to see if we need a large data segment. Since .lbss sections
5780 is placed right after the .bss section, there should be no need for
5781 a large data segment just because of .lbss. */
5782 s = bfd_get_section_by_name (abfd, ".ldata");
5783 if (s && (s->flags & SEC_LOAD))
5789 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5792 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5794 if (h->plt.offset != (bfd_vma) -1
5796 && !h->pointer_equality_needed)
5799 return _bfd_elf_hash_symbol (h);
5802 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5805 elf_x86_64_relocs_compatible (const bfd_target *input,
5806 const bfd_target *output)
5808 return ((xvec_get_elf_backend_data (input)->s->elfclass
5809 == xvec_get_elf_backend_data (output)->s->elfclass)
5810 && _bfd_elf_relocs_compatible (input, output));
5813 static const struct bfd_elf_special_section
5814 elf_x86_64_special_sections[]=
5816 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5817 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5818 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5819 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5820 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5821 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5822 { NULL, 0, 0, 0, 0 }
5825 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5826 #define TARGET_LITTLE_NAME "elf64-x86-64"
5827 #define ELF_ARCH bfd_arch_i386
5828 #define ELF_TARGET_ID X86_64_ELF_DATA
5829 #define ELF_MACHINE_CODE EM_X86_64
5830 #define ELF_MAXPAGESIZE 0x200000
5831 #define ELF_MINPAGESIZE 0x1000
5832 #define ELF_COMMONPAGESIZE 0x1000
5834 #define elf_backend_can_gc_sections 1
5835 #define elf_backend_can_refcount 1
5836 #define elf_backend_want_got_plt 1
5837 #define elf_backend_plt_readonly 1
5838 #define elf_backend_want_plt_sym 0
5839 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5840 #define elf_backend_rela_normal 1
5841 #define elf_backend_plt_alignment 4
5843 #define elf_info_to_howto elf_x86_64_info_to_howto
5845 #define bfd_elf64_bfd_link_hash_table_create \
5846 elf_x86_64_link_hash_table_create
5847 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5848 #define bfd_elf64_bfd_reloc_name_lookup \
5849 elf_x86_64_reloc_name_lookup
5851 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5852 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5853 #define elf_backend_check_relocs elf_x86_64_check_relocs
5854 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5855 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5856 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5857 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5858 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5859 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5860 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5861 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5863 #define elf_backend_write_core_note elf_x86_64_write_core_note
5865 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5866 #define elf_backend_relocate_section elf_x86_64_relocate_section
5867 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5868 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5869 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5870 #define elf_backend_object_p elf64_x86_64_elf_object_p
5871 #define bfd_elf64_mkobject elf_x86_64_mkobject
5872 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5874 #define elf_backend_section_from_shdr \
5875 elf_x86_64_section_from_shdr
5877 #define elf_backend_section_from_bfd_section \
5878 elf_x86_64_elf_section_from_bfd_section
5879 #define elf_backend_add_symbol_hook \
5880 elf_x86_64_add_symbol_hook
5881 #define elf_backend_symbol_processing \
5882 elf_x86_64_symbol_processing
5883 #define elf_backend_common_section_index \
5884 elf_x86_64_common_section_index
5885 #define elf_backend_common_section \
5886 elf_x86_64_common_section
5887 #define elf_backend_common_definition \
5888 elf_x86_64_common_definition
5889 #define elf_backend_merge_symbol \
5890 elf_x86_64_merge_symbol
5891 #define elf_backend_special_sections \
5892 elf_x86_64_special_sections
5893 #define elf_backend_additional_program_headers \
5894 elf_x86_64_additional_program_headers
5895 #define elf_backend_hash_symbol \
5896 elf_x86_64_hash_symbol
5898 #include "elf64-target.h"
5900 /* FreeBSD support. */
5902 #undef TARGET_LITTLE_SYM
5903 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5904 #undef TARGET_LITTLE_NAME
5905 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5908 #define ELF_OSABI ELFOSABI_FREEBSD
5911 #define elf64_bed elf64_x86_64_fbsd_bed
5913 #include "elf64-target.h"
5915 /* Solaris 2 support. */
5917 #undef TARGET_LITTLE_SYM
5918 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5919 #undef TARGET_LITTLE_NAME
5920 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5922 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5923 objects won't be recognized. */
5927 #define elf64_bed elf64_x86_64_sol2_bed
5929 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5931 #undef elf_backend_static_tls_alignment
5932 #define elf_backend_static_tls_alignment 16
5934 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5936 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5938 #undef elf_backend_want_plt_sym
5939 #define elf_backend_want_plt_sym 1
5941 #include "elf64-target.h"
5943 /* Native Client support. */
5946 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
5948 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
5949 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
5953 #undef TARGET_LITTLE_SYM
5954 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
5955 #undef TARGET_LITTLE_NAME
5956 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5958 #define elf64_bed elf64_x86_64_nacl_bed
5960 #undef ELF_MAXPAGESIZE
5961 #undef ELF_MINPAGESIZE
5962 #undef ELF_COMMONPAGESIZE
5963 #define ELF_MAXPAGESIZE 0x10000
5964 #define ELF_MINPAGESIZE 0x10000
5965 #define ELF_COMMONPAGESIZE 0x10000
5967 /* Restore defaults. */
5969 #undef elf_backend_static_tls_alignment
5970 #undef elf_backend_want_plt_sym
5971 #define elf_backend_want_plt_sym 0
5973 /* NaCl uses substantially different PLT entries for the same effects. */
5975 #undef elf_backend_plt_alignment
5976 #define elf_backend_plt_alignment 5
5977 #define NACL_PLT_ENTRY_SIZE 64
5978 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5980 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5982 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5983 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5984 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5985 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5986 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5988 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5989 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
5991 /* 32 bytes of nop to pad out to the standard size. */
5992 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5993 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5994 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5995 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5996 0x66, /* excess data32 prefix */
6000 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6002 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6003 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6004 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6005 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6007 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6008 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6009 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6011 /* Lazy GOT entries point here (32-byte aligned). */
6012 0x68, /* pushq immediate */
6013 0, 0, 0, 0, /* replaced with index into relocation table. */
6014 0xe9, /* jmp relative */
6015 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6017 /* 22 bytes of nop to pad out to the standard size. */
6018 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6019 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6020 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6023 /* .eh_frame covering the .plt section. */
6025 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6027 #if (PLT_CIE_LENGTH != 20 \
6028 || PLT_FDE_LENGTH != 36 \
6029 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6030 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6031 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6033 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6034 0, 0, 0, 0, /* CIE ID */
6035 1, /* CIE version */
6036 'z', 'R', 0, /* Augmentation string */
6037 1, /* Code alignment factor */
6038 0x78, /* Data alignment factor */
6039 16, /* Return address column */
6040 1, /* Augmentation size */
6041 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6042 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6043 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6044 DW_CFA_nop, DW_CFA_nop,
6046 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6047 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6048 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6049 0, 0, 0, 0, /* .plt size goes here */
6050 0, /* Augmentation size */
6051 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6052 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6053 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6054 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6055 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6056 13, /* Block length */
6057 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6058 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6059 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6060 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6061 DW_CFA_nop, DW_CFA_nop
6064 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6066 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6067 elf_x86_64_nacl_plt_entry, /* plt_entry */
6068 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6069 2, /* plt0_got1_offset */
6070 9, /* plt0_got2_offset */
6071 13, /* plt0_got2_insn_end */
6072 3, /* plt_got_offset */
6073 33, /* plt_reloc_offset */
6074 38, /* plt_plt_offset */
6075 7, /* plt_got_insn_size */
6076 42, /* plt_plt_insn_end */
6077 32, /* plt_lazy_offset */
6078 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6079 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6082 #undef elf_backend_arch_data
6083 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6085 #undef elf_backend_object_p
6086 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6087 #undef elf_backend_modify_segment_map
6088 #define elf_backend_modify_segment_map nacl_modify_segment_map
6089 #undef elf_backend_modify_program_headers
6090 #define elf_backend_modify_program_headers nacl_modify_program_headers
6091 #undef elf_backend_final_write_processing
6092 #define elf_backend_final_write_processing nacl_final_write_processing
6094 #include "elf64-target.h"
6096 /* Native Client x32 support. */
6099 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6101 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6102 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6106 #undef TARGET_LITTLE_SYM
6107 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6108 #undef TARGET_LITTLE_NAME
6109 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6111 #define elf32_bed elf32_x86_64_nacl_bed
6113 #define bfd_elf32_bfd_link_hash_table_create \
6114 elf_x86_64_link_hash_table_create
6115 #define bfd_elf32_bfd_reloc_type_lookup \
6116 elf_x86_64_reloc_type_lookup
6117 #define bfd_elf32_bfd_reloc_name_lookup \
6118 elf_x86_64_reloc_name_lookup
6119 #define bfd_elf32_mkobject \
6121 #define bfd_elf32_get_synthetic_symtab \
6122 elf_x86_64_get_synthetic_symtab
6124 #undef elf_backend_object_p
6125 #define elf_backend_object_p \
6126 elf32_x86_64_nacl_elf_object_p
6128 #undef elf_backend_bfd_from_remote_memory
6129 #define elf_backend_bfd_from_remote_memory \
6130 _bfd_elf32_bfd_from_remote_memory
6132 #undef elf_backend_size_info
6133 #define elf_backend_size_info \
6134 _bfd_elf32_size_info
6136 #include "elf32-target.h"
6138 /* Restore defaults. */
6139 #undef elf_backend_object_p
6140 #define elf_backend_object_p elf64_x86_64_elf_object_p
6141 #undef elf_backend_bfd_from_remote_memory
6142 #undef elf_backend_size_info
6143 #undef elf_backend_modify_segment_map
6144 #undef elf_backend_modify_program_headers
6145 #undef elf_backend_final_write_processing
6147 /* Intel L1OM support. */
6150 elf64_l1om_elf_object_p (bfd *abfd)
6152 /* Set the right machine number for an L1OM elf64 file. */
6153 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6157 #undef TARGET_LITTLE_SYM
6158 #define TARGET_LITTLE_SYM l1om_elf64_vec
6159 #undef TARGET_LITTLE_NAME
6160 #define TARGET_LITTLE_NAME "elf64-l1om"
6162 #define ELF_ARCH bfd_arch_l1om
6164 #undef ELF_MACHINE_CODE
6165 #define ELF_MACHINE_CODE EM_L1OM
6170 #define elf64_bed elf64_l1om_bed
6172 #undef elf_backend_object_p
6173 #define elf_backend_object_p elf64_l1om_elf_object_p
6175 /* Restore defaults. */
6176 #undef ELF_MAXPAGESIZE
6177 #undef ELF_MINPAGESIZE
6178 #undef ELF_COMMONPAGESIZE
6179 #define ELF_MAXPAGESIZE 0x200000
6180 #define ELF_MINPAGESIZE 0x1000
6181 #define ELF_COMMONPAGESIZE 0x1000
6182 #undef elf_backend_plt_alignment
6183 #define elf_backend_plt_alignment 4
6184 #undef elf_backend_arch_data
6185 #define elf_backend_arch_data &elf_x86_64_arch_bed
6187 #include "elf64-target.h"
6189 /* FreeBSD L1OM support. */
6191 #undef TARGET_LITTLE_SYM
6192 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6193 #undef TARGET_LITTLE_NAME
6194 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6197 #define ELF_OSABI ELFOSABI_FREEBSD
6200 #define elf64_bed elf64_l1om_fbsd_bed
6202 #include "elf64-target.h"
6204 /* Intel K1OM support. */
6207 elf64_k1om_elf_object_p (bfd *abfd)
6209 /* Set the right machine number for an K1OM elf64 file. */
6210 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6214 #undef TARGET_LITTLE_SYM
6215 #define TARGET_LITTLE_SYM k1om_elf64_vec
6216 #undef TARGET_LITTLE_NAME
6217 #define TARGET_LITTLE_NAME "elf64-k1om"
6219 #define ELF_ARCH bfd_arch_k1om
6221 #undef ELF_MACHINE_CODE
6222 #define ELF_MACHINE_CODE EM_K1OM
6227 #define elf64_bed elf64_k1om_bed
6229 #undef elf_backend_object_p
6230 #define elf_backend_object_p elf64_k1om_elf_object_p
6232 #undef elf_backend_static_tls_alignment
6234 #undef elf_backend_want_plt_sym
6235 #define elf_backend_want_plt_sym 0
6237 #include "elf64-target.h"
6239 /* FreeBSD K1OM support. */
6241 #undef TARGET_LITTLE_SYM
6242 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6243 #undef TARGET_LITTLE_NAME
6244 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6247 #define ELF_OSABI ELFOSABI_FREEBSD
6250 #define elf64_bed elf64_k1om_fbsd_bed
6252 #include "elf64-target.h"
6254 /* 32bit x86-64 support. */
6256 #undef TARGET_LITTLE_SYM
6257 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6258 #undef TARGET_LITTLE_NAME
6259 #define TARGET_LITTLE_NAME "elf32-x86-64"
6263 #define ELF_ARCH bfd_arch_i386
6265 #undef ELF_MACHINE_CODE
6266 #define ELF_MACHINE_CODE EM_X86_64
6270 #undef elf_backend_object_p
6271 #define elf_backend_object_p \
6272 elf32_x86_64_elf_object_p
6274 #undef elf_backend_bfd_from_remote_memory
6275 #define elf_backend_bfd_from_remote_memory \
6276 _bfd_elf32_bfd_from_remote_memory
6278 #undef elf_backend_size_info
6279 #define elf_backend_size_info \
6280 _bfd_elf32_size_info
6282 #include "elf32-target.h"