1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "elf/x86-64.h"
41 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
42 #define MINUS_ONE (~ (bfd_vma) 0)
44 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
45 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
46 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
47 since they are the same. */
49 #define ABI_64_P(abfd) \
50 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52 /* The relocation "howto" table. Order of fields:
53 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
54 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
55 static reloc_howto_type x86_64_elf_howto_table[] =
57 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
60 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
63 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
64 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
67 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
69 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
70 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
72 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
78 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
81 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
84 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
85 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
87 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
88 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
90 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
91 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
93 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
95 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
97 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
99 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
100 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
101 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
104 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
107 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
110 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
113 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
114 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
116 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
117 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
119 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
120 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
122 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
125 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
128 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
130 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
131 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
133 FALSE, 0xffffffff, 0xffffffff, TRUE),
134 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
135 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
137 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
138 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
140 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
141 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
142 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
143 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
144 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
146 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
147 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
149 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
150 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
152 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
153 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
155 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
156 complain_overflow_bitfield, bfd_elf_generic_reloc,
157 "R_X86_64_GOTPC32_TLSDESC",
158 FALSE, 0xffffffff, 0xffffffff, TRUE),
159 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
160 complain_overflow_dont, bfd_elf_generic_reloc,
161 "R_X86_64_TLSDESC_CALL",
163 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
164 complain_overflow_bitfield, bfd_elf_generic_reloc,
166 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
167 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
168 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
170 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
173 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
174 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
176 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
177 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
180 /* We have a gap in the reloc numbers here.
181 R_X86_64_standard counts the number up to this point, and
182 R_X86_64_vt_offset is the value to subtract from a reloc type of
183 R_X86_64_GNU_VT* to form an index into this table. */
184 #define R_X86_64_standard (R_X86_64_PLT32_BND + 1)
185 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
187 /* GNU extension to record C++ vtable hierarchy. */
188 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
189 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
191 /* GNU extension to record C++ vtable member usage. */
192 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
193 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
196 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
197 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
198 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
202 #define IS_X86_64_PCREL_TYPE(TYPE) \
203 ( ((TYPE) == R_X86_64_PC8) \
204 || ((TYPE) == R_X86_64_PC16) \
205 || ((TYPE) == R_X86_64_PC32) \
206 || ((TYPE) == R_X86_64_PC32_BND) \
207 || ((TYPE) == R_X86_64_PC64))
209 /* Map BFD relocs to the x86_64 elf relocs. */
212 bfd_reloc_code_real_type bfd_reloc_val;
213 unsigned char elf_reloc_val;
216 static const struct elf_reloc_map x86_64_reloc_map[] =
218 { BFD_RELOC_NONE, R_X86_64_NONE, },
219 { BFD_RELOC_64, R_X86_64_64, },
220 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
221 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
222 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
223 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
224 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
225 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
226 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
227 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
228 { BFD_RELOC_32, R_X86_64_32, },
229 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
230 { BFD_RELOC_16, R_X86_64_16, },
231 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
232 { BFD_RELOC_8, R_X86_64_8, },
233 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
234 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
235 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
236 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
237 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
238 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
239 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
240 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
241 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
242 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
243 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
244 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
245 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
246 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
247 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
248 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
249 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
250 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
251 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
252 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
253 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
254 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
255 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
256 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND,},
257 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND,},
258 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
259 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
262 static reloc_howto_type *
263 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
267 if (r_type == (unsigned int) R_X86_64_32)
272 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
274 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
275 || r_type >= (unsigned int) R_X86_64_max)
277 if (r_type >= (unsigned int) R_X86_64_standard)
279 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
281 r_type = R_X86_64_NONE;
286 i = r_type - (unsigned int) R_X86_64_vt_offset;
287 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
288 return &x86_64_elf_howto_table[i];
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type *
293 elf_x86_64_reloc_type_lookup (bfd *abfd,
294 bfd_reloc_code_real_type code)
298 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
301 if (x86_64_reloc_map[i].bfd_reloc_val == code)
302 return elf_x86_64_rtype_to_howto (abfd,
303 x86_64_reloc_map[i].elf_reloc_val);
308 static reloc_howto_type *
309 elf_x86_64_reloc_name_lookup (bfd *abfd,
314 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type *reloc
318 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
319 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
323 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
324 if (x86_64_elf_howto_table[i].name != NULL
325 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
326 return &x86_64_elf_howto_table[i];
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
334 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
335 Elf_Internal_Rela *dst)
339 r_type = ELF32_R_TYPE (dst->r_info);
340 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
341 BFD_ASSERT (r_type == cache_ptr->howto->type);
344 /* Support for core dump NOTE sections. */
346 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
351 switch (note->descsz)
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
358 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
361 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
371 elf_tdata (abfd)->core->signal
372 = bfd_get_16 (abfd, note->descdata + 12);
375 elf_tdata (abfd)->core->lwpid
376 = bfd_get_32 (abfd, note->descdata + 32);
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
387 size, note->descpos + offset);
391 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
393 switch (note->descsz)
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd)->core->pid
400 = bfd_get_32 (abfd, note->descdata + 12);
401 elf_tdata (abfd)->core->program
402 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
403 elf_tdata (abfd)->core->command
404 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 24);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
421 char *command = elf_tdata (abfd)->core->command;
422 int n = strlen (command);
424 if (0 < n && command[n - 1] == ' ')
425 command[n - 1] = '\0';
433 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
436 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
438 const char *fname, *psargs;
449 va_start (ap, note_type);
450 fname = va_arg (ap, const char *);
451 psargs = va_arg (ap, const char *);
454 if (bed->s->elfclass == ELFCLASS32)
457 memset (&data, 0, sizeof (data));
458 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
459 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
460 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
461 &data, sizeof (data));
466 memset (&data, 0, sizeof (data));
467 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
468 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
469 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
470 &data, sizeof (data));
475 va_start (ap, note_type);
476 pid = va_arg (ap, long);
477 cursig = va_arg (ap, int);
478 gregs = va_arg (ap, const void *);
481 if (bed->s->elfclass == ELFCLASS32)
483 if (bed->elf_machine_code == EM_X86_64)
485 prstatusx32_t prstat;
486 memset (&prstat, 0, sizeof (prstat));
488 prstat.pr_cursig = cursig;
489 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
490 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
491 &prstat, sizeof (prstat));
496 memset (&prstat, 0, sizeof (prstat));
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
507 memset (&prstat, 0, sizeof (prstat));
509 prstat.pr_cursig = cursig;
510 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
511 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
512 &prstat, sizeof (prstat));
519 /* Functions for the x86-64 ELF linker. */
521 /* The name of the dynamic interpreter. This is put in the .interp
524 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
525 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
527 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
528 copying dynamic variables from a shared lib into an app's dynbss
529 section, and instead use a dynamic relocation to point into the
531 #define ELIMINATE_COPY_RELOCS 1
533 /* The size in bytes of an entry in the global offset table. */
535 #define GOT_ENTRY_SIZE 8
537 /* The size in bytes of an entry in the procedure linkage table. */
539 #define PLT_ENTRY_SIZE 16
541 /* The first entry in a procedure linkage table looks like this. See the
542 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
544 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
546 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
547 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
548 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
551 /* Subsequent entries in a procedure linkage table look like this. */
553 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
555 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
556 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
557 0x68, /* pushq immediate */
558 0, 0, 0, 0, /* replaced with index into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
563 /* The first entry in a procedure linkage table with BND relocations
566 static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
568 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
569 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
570 0x0f, 0x1f, 0 /* nopl (%rax) */
573 /* Subsequent entries for legacy branches in a procedure linkage table
574 with BND relocations look like this. */
576 static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
578 0x68, 0, 0, 0, 0, /* pushq immediate */
579 0xe9, 0, 0, 0, 0, /* jmpq relative */
580 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
583 /* Subsequent entries for branches with BND prefx in a procedure linkage
584 table with BND relocations look like this. */
586 static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
590 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
593 /* Entries for legacy branches in the second procedure linkage table
596 static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
598 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
599 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* Entries for branches with BND prefix in the second procedure linkage
604 table look like this. */
606 static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
608 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
613 /* .eh_frame covering the .plt section. */
615 static const bfd_byte elf_x86_64_eh_frame_plt[] =
617 #define PLT_CIE_LENGTH 20
618 #define PLT_FDE_LENGTH 36
619 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
620 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
621 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
622 0, 0, 0, 0, /* CIE ID */
624 'z', 'R', 0, /* Augmentation string */
625 1, /* Code alignment factor */
626 0x78, /* Data alignment factor */
627 16, /* Return address column */
628 1, /* Augmentation size */
629 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
630 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
631 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
632 DW_CFA_nop, DW_CFA_nop,
634 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
635 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
636 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
637 0, 0, 0, 0, /* .plt size goes here */
638 0, /* Augmentation size */
639 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
640 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
641 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
642 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
643 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
644 11, /* Block length */
645 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
646 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
647 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
648 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
649 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
652 /* Architecture-specific backend data for x86-64. */
654 struct elf_x86_64_backend_data
656 /* Templates for the initial PLT entry and for subsequent entries. */
657 const bfd_byte *plt0_entry;
658 const bfd_byte *plt_entry;
659 unsigned int plt_entry_size; /* Size of each PLT entry. */
661 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
662 unsigned int plt0_got1_offset;
663 unsigned int plt0_got2_offset;
665 /* Offset of the end of the PC-relative instruction containing
667 unsigned int plt0_got2_insn_end;
669 /* Offsets into plt_entry that are to be replaced with... */
670 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
671 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
672 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
674 /* Length of the PC-relative instruction containing plt_got_offset. */
675 unsigned int plt_got_insn_size;
677 /* Offset of the end of the PC-relative jump to plt0_entry. */
678 unsigned int plt_plt_insn_end;
680 /* Offset into plt_entry where the initial value of the GOT entry points. */
681 unsigned int plt_lazy_offset;
683 /* .eh_frame covering the .plt section. */
684 const bfd_byte *eh_frame_plt;
685 unsigned int eh_frame_plt_size;
688 #define get_elf_x86_64_arch_data(bed) \
689 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
691 #define get_elf_x86_64_backend_data(abfd) \
692 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
694 #define GET_PLT_ENTRY_SIZE(abfd) \
695 get_elf_x86_64_backend_data (abfd)->plt_entry_size
697 /* These are the standard parameters. */
698 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
700 elf_x86_64_plt0_entry, /* plt0_entry */
701 elf_x86_64_plt_entry, /* plt_entry */
702 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
703 2, /* plt0_got1_offset */
704 8, /* plt0_got2_offset */
705 12, /* plt0_got2_insn_end */
706 2, /* plt_got_offset */
707 7, /* plt_reloc_offset */
708 12, /* plt_plt_offset */
709 6, /* plt_got_insn_size */
710 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
711 6, /* plt_lazy_offset */
712 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
713 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
716 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
718 elf_x86_64_bnd_plt0_entry, /* plt0_entry */
719 elf_x86_64_bnd_plt_entry, /* plt_entry */
720 sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
721 2, /* plt0_got1_offset */
722 1+8, /* plt0_got2_offset */
723 1+12, /* plt0_got2_insn_end */
724 1+2, /* plt_got_offset */
725 1, /* plt_reloc_offset */
726 7, /* plt_plt_offset */
727 1+6, /* plt_got_insn_size */
728 11, /* plt_plt_insn_end */
729 0, /* plt_lazy_offset */
730 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
731 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
734 #define elf_backend_arch_data &elf_x86_64_arch_bed
736 /* x86-64 ELF linker hash entry. */
738 struct elf_x86_64_link_hash_entry
740 struct elf_link_hash_entry elf;
742 /* Track dynamic relocs copied for this symbol. */
743 struct elf_dyn_relocs *dyn_relocs;
745 #define GOT_UNKNOWN 0
749 #define GOT_TLS_GDESC 4
750 #define GOT_TLS_GD_BOTH_P(type) \
751 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
752 #define GOT_TLS_GD_P(type) \
753 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
754 #define GOT_TLS_GDESC_P(type) \
755 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
756 #define GOT_TLS_GD_ANY_P(type) \
757 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
758 unsigned char tls_type;
760 /* TRUE if a weak symbol with a real definition needs a copy reloc.
761 When there is a weak symbol with a real definition, the processor
762 independent code will have arranged for us to see the real
763 definition first. We need to copy the needs_copy bit from the
764 real definition and check it when allowing copy reloc in PIE. */
765 unsigned int needs_copy : 1;
767 /* TRUE if symbol has at least one BND relocation. */
768 unsigned int has_bnd_reloc : 1;
770 /* Information about the GOT PLT entry. Filled when there are both
771 GOT and PLT relocations against the same function. */
772 union gotplt_union plt_got;
774 /* Information about the second PLT entry. Filled when has_bnd_reloc is
776 union gotplt_union plt_bnd;
778 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
779 starting at the end of the jump table. */
783 #define elf_x86_64_hash_entry(ent) \
784 ((struct elf_x86_64_link_hash_entry *)(ent))
786 struct elf_x86_64_obj_tdata
788 struct elf_obj_tdata root;
790 /* tls_type for each local got entry. */
791 char *local_got_tls_type;
793 /* GOTPLT entries for TLS descriptors. */
794 bfd_vma *local_tlsdesc_gotent;
797 #define elf_x86_64_tdata(abfd) \
798 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
800 #define elf_x86_64_local_got_tls_type(abfd) \
801 (elf_x86_64_tdata (abfd)->local_got_tls_type)
803 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
804 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
806 #define is_x86_64_elf(bfd) \
807 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
808 && elf_tdata (bfd) != NULL \
809 && elf_object_id (bfd) == X86_64_ELF_DATA)
812 elf_x86_64_mkobject (bfd *abfd)
814 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
818 /* x86-64 ELF linker hash table. */
820 struct elf_x86_64_link_hash_table
822 struct elf_link_hash_table elf;
824 /* Short-cuts to get to dynamic linker sections. */
827 asection *plt_eh_frame;
833 bfd_signed_vma refcount;
837 /* The amount of space used by the jump slots in the GOT. */
838 bfd_vma sgotplt_jump_table_size;
840 /* Small local sym cache. */
841 struct sym_cache sym_cache;
843 bfd_vma (*r_info) (bfd_vma, bfd_vma);
844 bfd_vma (*r_sym) (bfd_vma);
845 unsigned int pointer_r_type;
846 const char *dynamic_interpreter;
847 int dynamic_interpreter_size;
849 /* _TLS_MODULE_BASE_ symbol. */
850 struct bfd_link_hash_entry *tls_module_base;
852 /* Used by local STT_GNU_IFUNC symbols. */
853 htab_t loc_hash_table;
854 void * loc_hash_memory;
856 /* The offset into splt of the PLT entry for the TLS descriptor
857 resolver. Special values are 0, if not necessary (or not found
858 to be necessary yet), and -1 if needed but not determined
861 /* The offset into sgot of the GOT entry used by the PLT entry
865 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
866 bfd_vma next_jump_slot_index;
867 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
868 bfd_vma next_irelative_index;
871 /* Get the x86-64 ELF linker hash table from a link_info structure. */
873 #define elf_x86_64_hash_table(p) \
874 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
875 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
877 #define elf_x86_64_compute_jump_table_size(htab) \
878 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
880 /* Create an entry in an x86-64 ELF linker hash table. */
882 static struct bfd_hash_entry *
883 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
884 struct bfd_hash_table *table,
887 /* Allocate the structure if it has not already been allocated by a
891 entry = (struct bfd_hash_entry *)
892 bfd_hash_allocate (table,
893 sizeof (struct elf_x86_64_link_hash_entry));
898 /* Call the allocation method of the superclass. */
899 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
902 struct elf_x86_64_link_hash_entry *eh;
904 eh = (struct elf_x86_64_link_hash_entry *) entry;
905 eh->dyn_relocs = NULL;
906 eh->tls_type = GOT_UNKNOWN;
908 eh->has_bnd_reloc = 0;
909 eh->plt_bnd.offset = (bfd_vma) -1;
910 eh->plt_got.offset = (bfd_vma) -1;
911 eh->tlsdesc_got = (bfd_vma) -1;
917 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
918 for local symbol so that we can handle local STT_GNU_IFUNC symbols
919 as global symbol. We reuse indx and dynstr_index for local symbol
920 hash since they aren't used by global symbols in this backend. */
923 elf_x86_64_local_htab_hash (const void *ptr)
925 struct elf_link_hash_entry *h
926 = (struct elf_link_hash_entry *) ptr;
927 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
930 /* Compare local hash entries. */
933 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
935 struct elf_link_hash_entry *h1
936 = (struct elf_link_hash_entry *) ptr1;
937 struct elf_link_hash_entry *h2
938 = (struct elf_link_hash_entry *) ptr2;
940 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
943 /* Find and/or create a hash entry for local symbol. */
945 static struct elf_link_hash_entry *
946 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
947 bfd *abfd, const Elf_Internal_Rela *rel,
950 struct elf_x86_64_link_hash_entry e, *ret;
951 asection *sec = abfd->sections;
952 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
953 htab->r_sym (rel->r_info));
956 e.elf.indx = sec->id;
957 e.elf.dynstr_index = htab->r_sym (rel->r_info);
958 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
959 create ? INSERT : NO_INSERT);
966 ret = (struct elf_x86_64_link_hash_entry *) *slot;
970 ret = (struct elf_x86_64_link_hash_entry *)
971 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
972 sizeof (struct elf_x86_64_link_hash_entry));
975 memset (ret, 0, sizeof (*ret));
976 ret->elf.indx = sec->id;
977 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
978 ret->elf.dynindx = -1;
979 ret->plt_got.offset = (bfd_vma) -1;
985 /* Destroy an X86-64 ELF linker hash table. */
988 elf_x86_64_link_hash_table_free (bfd *obfd)
990 struct elf_x86_64_link_hash_table *htab
991 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
993 if (htab->loc_hash_table)
994 htab_delete (htab->loc_hash_table);
995 if (htab->loc_hash_memory)
996 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
997 _bfd_elf_link_hash_table_free (obfd);
1000 /* Create an X86-64 ELF linker hash table. */
1002 static struct bfd_link_hash_table *
1003 elf_x86_64_link_hash_table_create (bfd *abfd)
1005 struct elf_x86_64_link_hash_table *ret;
1006 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
1008 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
1012 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1013 elf_x86_64_link_hash_newfunc,
1014 sizeof (struct elf_x86_64_link_hash_entry),
1021 if (ABI_64_P (abfd))
1023 ret->r_info = elf64_r_info;
1024 ret->r_sym = elf64_r_sym;
1025 ret->pointer_r_type = R_X86_64_64;
1026 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1027 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1031 ret->r_info = elf32_r_info;
1032 ret->r_sym = elf32_r_sym;
1033 ret->pointer_r_type = R_X86_64_32;
1034 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1035 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1038 ret->loc_hash_table = htab_try_create (1024,
1039 elf_x86_64_local_htab_hash,
1040 elf_x86_64_local_htab_eq,
1042 ret->loc_hash_memory = objalloc_create ();
1043 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1045 elf_x86_64_link_hash_table_free (abfd);
1048 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1050 return &ret->elf.root;
1053 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1054 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1058 elf_x86_64_create_dynamic_sections (bfd *dynobj,
1059 struct bfd_link_info *info)
1061 struct elf_x86_64_link_hash_table *htab;
1063 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1066 htab = elf_x86_64_hash_table (info);
1070 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1074 if (info->executable)
1076 /* Always allow copy relocs for building executables. */
1077 asection *s = bfd_get_linker_section (dynobj, ".rela.bss");
1080 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1081 s = bfd_make_section_anyway_with_flags (dynobj,
1083 (bed->dynamic_sec_flags
1086 || ! bfd_set_section_alignment (dynobj, s,
1087 bed->s->log_file_align))
1093 if (!info->no_ld_generated_unwind_info
1094 && htab->plt_eh_frame == NULL
1095 && htab->elf.splt != NULL)
1097 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1098 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1099 | SEC_LINKER_CREATED);
1101 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1102 if (htab->plt_eh_frame == NULL
1103 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
1109 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1112 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1113 struct elf_link_hash_entry *dir,
1114 struct elf_link_hash_entry *ind)
1116 struct elf_x86_64_link_hash_entry *edir, *eind;
1118 edir = (struct elf_x86_64_link_hash_entry *) dir;
1119 eind = (struct elf_x86_64_link_hash_entry *) ind;
1121 if (!edir->has_bnd_reloc)
1122 edir->has_bnd_reloc = eind->has_bnd_reloc;
1124 if (eind->dyn_relocs != NULL)
1126 if (edir->dyn_relocs != NULL)
1128 struct elf_dyn_relocs **pp;
1129 struct elf_dyn_relocs *p;
1131 /* Add reloc counts against the indirect sym to the direct sym
1132 list. Merge any entries against the same section. */
1133 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1135 struct elf_dyn_relocs *q;
1137 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1138 if (q->sec == p->sec)
1140 q->pc_count += p->pc_count;
1141 q->count += p->count;
1148 *pp = edir->dyn_relocs;
1151 edir->dyn_relocs = eind->dyn_relocs;
1152 eind->dyn_relocs = NULL;
1155 if (ind->root.type == bfd_link_hash_indirect
1156 && dir->got.refcount <= 0)
1158 edir->tls_type = eind->tls_type;
1159 eind->tls_type = GOT_UNKNOWN;
1162 if (ELIMINATE_COPY_RELOCS
1163 && ind->root.type != bfd_link_hash_indirect
1164 && dir->dynamic_adjusted)
1166 /* If called to transfer flags for a weakdef during processing
1167 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1168 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1169 dir->ref_dynamic |= ind->ref_dynamic;
1170 dir->ref_regular |= ind->ref_regular;
1171 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1172 dir->needs_plt |= ind->needs_plt;
1173 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1176 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1180 elf64_x86_64_elf_object_p (bfd *abfd)
1182 /* Set the right machine number for an x86-64 elf64 file. */
1183 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1188 elf32_x86_64_elf_object_p (bfd *abfd)
1190 /* Set the right machine number for an x86-64 elf32 file. */
1191 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1195 /* Return TRUE if the TLS access code sequence support transition
1199 elf_x86_64_check_tls_transition (bfd *abfd,
1200 struct bfd_link_info *info,
1203 Elf_Internal_Shdr *symtab_hdr,
1204 struct elf_link_hash_entry **sym_hashes,
1205 unsigned int r_type,
1206 const Elf_Internal_Rela *rel,
1207 const Elf_Internal_Rela *relend)
1210 unsigned long r_symndx;
1211 bfd_boolean largepic = FALSE;
1212 struct elf_link_hash_entry *h;
1214 struct elf_x86_64_link_hash_table *htab;
1216 /* Get the section contents. */
1217 if (contents == NULL)
1219 if (elf_section_data (sec)->this_hdr.contents != NULL)
1220 contents = elf_section_data (sec)->this_hdr.contents;
1223 /* FIXME: How to better handle error condition? */
1224 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1227 /* Cache the section contents for elf_link_input_bfd. */
1228 elf_section_data (sec)->this_hdr.contents = contents;
1232 htab = elf_x86_64_hash_table (info);
1233 offset = rel->r_offset;
1236 case R_X86_64_TLSGD:
1237 case R_X86_64_TLSLD:
1238 if ((rel + 1) >= relend)
1241 if (r_type == R_X86_64_TLSGD)
1243 /* Check transition from GD access model. For 64bit, only
1244 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1245 .word 0x6666; rex64; call __tls_get_addr
1246 can transit to different access model. For 32bit, only
1247 leaq foo@tlsgd(%rip), %rdi
1248 .word 0x6666; rex64; call __tls_get_addr
1249 can transit to different access model. For largepic
1251 leaq foo@tlsgd(%rip), %rdi
1252 movabsq $__tls_get_addr@pltoff, %rax
1256 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1257 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1259 if ((offset + 12) > sec->size)
1262 if (memcmp (contents + offset + 4, call, 4) != 0)
1264 if (!ABI_64_P (abfd)
1265 || (offset + 19) > sec->size
1267 || memcmp (contents + offset - 3, leaq + 1, 3) != 0
1268 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1269 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1274 else if (ABI_64_P (abfd))
1277 || memcmp (contents + offset - 4, leaq, 4) != 0)
1283 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1289 /* Check transition from LD access model. Only
1290 leaq foo@tlsld(%rip), %rdi;
1292 can transit to different access model. For largepic
1294 leaq foo@tlsld(%rip), %rdi
1295 movabsq $__tls_get_addr@pltoff, %rax
1299 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1301 if (offset < 3 || (offset + 9) > sec->size)
1304 if (memcmp (contents + offset - 3, lea, 3) != 0)
1307 if (0xe8 != *(contents + offset + 4))
1309 if (!ABI_64_P (abfd)
1310 || (offset + 19) > sec->size
1311 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1312 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1319 r_symndx = htab->r_sym (rel[1].r_info);
1320 if (r_symndx < symtab_hdr->sh_info)
1323 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1324 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1325 may be versioned. */
1327 && h->root.root.string != NULL
1329 ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64
1330 : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1331 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32))
1332 && (strncmp (h->root.root.string,
1333 "__tls_get_addr", 14) == 0));
1335 case R_X86_64_GOTTPOFF:
1336 /* Check transition from IE access model:
1337 mov foo@gottpoff(%rip), %reg
1338 add foo@gottpoff(%rip), %reg
1341 /* Check REX prefix first. */
1342 if (offset >= 3 && (offset + 4) <= sec->size)
1344 val = bfd_get_8 (abfd, contents + offset - 3);
1345 if (val != 0x48 && val != 0x4c)
1347 /* X32 may have 0x44 REX prefix or no REX prefix. */
1348 if (ABI_64_P (abfd))
1354 /* X32 may not have any REX prefix. */
1355 if (ABI_64_P (abfd))
1357 if (offset < 2 || (offset + 3) > sec->size)
1361 val = bfd_get_8 (abfd, contents + offset - 2);
1362 if (val != 0x8b && val != 0x03)
1365 val = bfd_get_8 (abfd, contents + offset - 1);
1366 return (val & 0xc7) == 5;
1368 case R_X86_64_GOTPC32_TLSDESC:
1369 /* Check transition from GDesc access model:
1370 leaq x@tlsdesc(%rip), %rax
1372 Make sure it's a leaq adding rip to a 32-bit offset
1373 into any register, although it's probably almost always
1376 if (offset < 3 || (offset + 4) > sec->size)
1379 val = bfd_get_8 (abfd, contents + offset - 3);
1380 if ((val & 0xfb) != 0x48)
1383 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1386 val = bfd_get_8 (abfd, contents + offset - 1);
1387 return (val & 0xc7) == 0x05;
1389 case R_X86_64_TLSDESC_CALL:
1390 /* Check transition from GDesc access model:
1391 call *x@tlsdesc(%rax)
1393 if (offset + 2 <= sec->size)
1395 /* Make sure that it's a call *x@tlsdesc(%rax). */
1396 static const unsigned char call[] = { 0xff, 0x10 };
1397 return memcmp (contents + offset, call, 2) == 0;
1407 /* Return TRUE if the TLS access transition is OK or no transition
1408 will be performed. Update R_TYPE if there is a transition. */
1411 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1412 asection *sec, bfd_byte *contents,
1413 Elf_Internal_Shdr *symtab_hdr,
1414 struct elf_link_hash_entry **sym_hashes,
1415 unsigned int *r_type, int tls_type,
1416 const Elf_Internal_Rela *rel,
1417 const Elf_Internal_Rela *relend,
1418 struct elf_link_hash_entry *h,
1419 unsigned long r_symndx)
1421 unsigned int from_type = *r_type;
1422 unsigned int to_type = from_type;
1423 bfd_boolean check = TRUE;
1425 /* Skip TLS transition for functions. */
1427 && (h->type == STT_FUNC
1428 || h->type == STT_GNU_IFUNC))
1433 case R_X86_64_TLSGD:
1434 case R_X86_64_GOTPC32_TLSDESC:
1435 case R_X86_64_TLSDESC_CALL:
1436 case R_X86_64_GOTTPOFF:
1437 if (info->executable)
1440 to_type = R_X86_64_TPOFF32;
1442 to_type = R_X86_64_GOTTPOFF;
1445 /* When we are called from elf_x86_64_relocate_section,
1446 CONTENTS isn't NULL and there may be additional transitions
1447 based on TLS_TYPE. */
1448 if (contents != NULL)
1450 unsigned int new_to_type = to_type;
1452 if (info->executable
1455 && tls_type == GOT_TLS_IE)
1456 new_to_type = R_X86_64_TPOFF32;
1458 if (to_type == R_X86_64_TLSGD
1459 || to_type == R_X86_64_GOTPC32_TLSDESC
1460 || to_type == R_X86_64_TLSDESC_CALL)
1462 if (tls_type == GOT_TLS_IE)
1463 new_to_type = R_X86_64_GOTTPOFF;
1466 /* We checked the transition before when we were called from
1467 elf_x86_64_check_relocs. We only want to check the new
1468 transition which hasn't been checked before. */
1469 check = new_to_type != to_type && from_type == to_type;
1470 to_type = new_to_type;
1475 case R_X86_64_TLSLD:
1476 if (info->executable)
1477 to_type = R_X86_64_TPOFF32;
1484 /* Return TRUE if there is no transition. */
1485 if (from_type == to_type)
1488 /* Check if the transition can be performed. */
1490 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1491 symtab_hdr, sym_hashes,
1492 from_type, rel, relend))
1494 reloc_howto_type *from, *to;
1497 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1498 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1501 name = h->root.root.string;
1504 struct elf_x86_64_link_hash_table *htab;
1506 htab = elf_x86_64_hash_table (info);
1511 Elf_Internal_Sym *isym;
1513 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1515 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1519 (*_bfd_error_handler)
1520 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1521 "in section `%A' failed"),
1522 abfd, sec, from->name, to->name, name,
1523 (unsigned long) rel->r_offset);
1524 bfd_set_error (bfd_error_bad_value);
1532 /* Look through the relocs for a section during the first phase, and
1533 calculate needed space in the global offset table, procedure
1534 linkage table, and dynamic reloc sections. */
1537 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1539 const Elf_Internal_Rela *relocs)
1541 struct elf_x86_64_link_hash_table *htab;
1542 Elf_Internal_Shdr *symtab_hdr;
1543 struct elf_link_hash_entry **sym_hashes;
1544 const Elf_Internal_Rela *rel;
1545 const Elf_Internal_Rela *rel_end;
1547 bfd_boolean use_plt_got;
1549 if (info->relocatable)
1552 BFD_ASSERT (is_x86_64_elf (abfd));
1554 htab = elf_x86_64_hash_table (info);
1558 use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
1560 symtab_hdr = &elf_symtab_hdr (abfd);
1561 sym_hashes = elf_sym_hashes (abfd);
1565 rel_end = relocs + sec->reloc_count;
1566 for (rel = relocs; rel < rel_end; rel++)
1568 unsigned int r_type;
1569 unsigned long r_symndx;
1570 struct elf_link_hash_entry *h;
1571 Elf_Internal_Sym *isym;
1573 bfd_boolean size_reloc;
1575 r_symndx = htab->r_sym (rel->r_info);
1576 r_type = ELF32_R_TYPE (rel->r_info);
1578 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1580 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1585 if (r_symndx < symtab_hdr->sh_info)
1587 /* A local symbol. */
1588 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1593 /* Check relocation against local STT_GNU_IFUNC symbol. */
1594 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1596 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1601 /* Fake a STT_GNU_IFUNC symbol. */
1602 h->type = STT_GNU_IFUNC;
1605 h->forced_local = 1;
1606 h->root.type = bfd_link_hash_defined;
1614 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1615 while (h->root.type == bfd_link_hash_indirect
1616 || h->root.type == bfd_link_hash_warning)
1617 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1620 /* Check invalid x32 relocations. */
1621 if (!ABI_64_P (abfd))
1627 case R_X86_64_DTPOFF64:
1628 case R_X86_64_TPOFF64:
1630 case R_X86_64_GOTOFF64:
1631 case R_X86_64_GOT64:
1632 case R_X86_64_GOTPCREL64:
1633 case R_X86_64_GOTPC64:
1634 case R_X86_64_GOTPLT64:
1635 case R_X86_64_PLTOFF64:
1638 name = h->root.root.string;
1640 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1642 (*_bfd_error_handler)
1643 (_("%B: relocation %s against symbol `%s' isn't "
1644 "supported in x32 mode"), abfd,
1645 x86_64_elf_howto_table[r_type].name, name);
1646 bfd_set_error (bfd_error_bad_value);
1654 /* Create the ifunc sections for static executables. If we
1655 never see an indirect function symbol nor we are building
1656 a static executable, those sections will be empty and
1657 won't appear in output. */
1663 case R_X86_64_PC32_BND:
1664 case R_X86_64_PLT32_BND:
1666 case R_X86_64_PLT32:
1669 /* MPX PLT is supported only if elf_x86_64_arch_bed
1670 is used in 64-bit mode. */
1673 && (get_elf_x86_64_backend_data (abfd)
1674 == &elf_x86_64_arch_bed))
1676 elf_x86_64_hash_entry (h)->has_bnd_reloc = 1;
1678 /* Create the second PLT for Intel MPX support. */
1679 if (htab->plt_bnd == NULL)
1681 unsigned int plt_bnd_align;
1682 const struct elf_backend_data *bed;
1684 bed = get_elf_backend_data (info->output_bfd);
1685 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) == 8
1686 && (sizeof (elf_x86_64_bnd_plt2_entry)
1687 == sizeof (elf_x86_64_legacy_plt2_entry)));
1690 if (htab->elf.dynobj == NULL)
1691 htab->elf.dynobj = abfd;
1693 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1695 (bed->dynamic_sec_flags
1700 if (htab->plt_bnd == NULL
1701 || !bfd_set_section_alignment (htab->elf.dynobj,
1710 case R_X86_64_GOTPCREL:
1711 case R_X86_64_GOTPCREL64:
1712 if (htab->elf.dynobj == NULL)
1713 htab->elf.dynobj = abfd;
1714 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1719 /* It is referenced by a non-shared object. */
1721 h->root.non_ir_ref = 1;
1724 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1725 symtab_hdr, sym_hashes,
1726 &r_type, GOT_UNKNOWN,
1727 rel, rel_end, h, r_symndx))
1732 case R_X86_64_TLSLD:
1733 htab->tls_ld_got.refcount += 1;
1736 case R_X86_64_TPOFF32:
1737 if (!info->executable && ABI_64_P (abfd))
1740 name = h->root.root.string;
1742 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1744 (*_bfd_error_handler)
1745 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1747 x86_64_elf_howto_table[r_type].name, name);
1748 bfd_set_error (bfd_error_bad_value);
1753 case R_X86_64_GOTTPOFF:
1754 if (!info->executable)
1755 info->flags |= DF_STATIC_TLS;
1758 case R_X86_64_GOT32:
1759 case R_X86_64_GOTPCREL:
1760 case R_X86_64_TLSGD:
1761 case R_X86_64_GOT64:
1762 case R_X86_64_GOTPCREL64:
1763 case R_X86_64_GOTPLT64:
1764 case R_X86_64_GOTPC32_TLSDESC:
1765 case R_X86_64_TLSDESC_CALL:
1766 /* This symbol requires a global offset table entry. */
1768 int tls_type, old_tls_type;
1772 default: tls_type = GOT_NORMAL; break;
1773 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1774 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1775 case R_X86_64_GOTPC32_TLSDESC:
1776 case R_X86_64_TLSDESC_CALL:
1777 tls_type = GOT_TLS_GDESC; break;
1782 h->got.refcount += 1;
1783 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1787 bfd_signed_vma *local_got_refcounts;
1789 /* This is a global offset table entry for a local symbol. */
1790 local_got_refcounts = elf_local_got_refcounts (abfd);
1791 if (local_got_refcounts == NULL)
1795 size = symtab_hdr->sh_info;
1796 size *= sizeof (bfd_signed_vma)
1797 + sizeof (bfd_vma) + sizeof (char);
1798 local_got_refcounts = ((bfd_signed_vma *)
1799 bfd_zalloc (abfd, size));
1800 if (local_got_refcounts == NULL)
1802 elf_local_got_refcounts (abfd) = local_got_refcounts;
1803 elf_x86_64_local_tlsdesc_gotent (abfd)
1804 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1805 elf_x86_64_local_got_tls_type (abfd)
1806 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1808 local_got_refcounts[r_symndx] += 1;
1810 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1813 /* If a TLS symbol is accessed using IE at least once,
1814 there is no point to use dynamic model for it. */
1815 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1816 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1817 || tls_type != GOT_TLS_IE))
1819 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1820 tls_type = old_tls_type;
1821 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1822 && GOT_TLS_GD_ANY_P (tls_type))
1823 tls_type |= old_tls_type;
1827 name = h->root.root.string;
1829 name = bfd_elf_sym_name (abfd, symtab_hdr,
1831 (*_bfd_error_handler)
1832 (_("%B: '%s' accessed both as normal and thread local symbol"),
1834 bfd_set_error (bfd_error_bad_value);
1839 if (old_tls_type != tls_type)
1842 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1844 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1849 case R_X86_64_GOTOFF64:
1850 case R_X86_64_GOTPC32:
1851 case R_X86_64_GOTPC64:
1853 if (htab->elf.sgot == NULL)
1855 if (htab->elf.dynobj == NULL)
1856 htab->elf.dynobj = abfd;
1857 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1863 case R_X86_64_PLT32:
1864 case R_X86_64_PLT32_BND:
1865 /* This symbol requires a procedure linkage table entry. We
1866 actually build the entry in adjust_dynamic_symbol,
1867 because this might be a case of linking PIC code which is
1868 never referenced by a dynamic object, in which case we
1869 don't need to generate a procedure linkage table entry
1872 /* If this is a local symbol, we resolve it directly without
1873 creating a procedure linkage table entry. */
1878 h->plt.refcount += 1;
1881 case R_X86_64_PLTOFF64:
1882 /* This tries to form the 'address' of a function relative
1883 to GOT. For global symbols we need a PLT entry. */
1887 h->plt.refcount += 1;
1891 case R_X86_64_SIZE32:
1892 case R_X86_64_SIZE64:
1897 if (!ABI_64_P (abfd))
1902 /* Let's help debug shared library creation. These relocs
1903 cannot be used in shared libs. Don't error out for
1904 sections we don't care about, such as debug sections or
1905 non-constant sections. */
1907 && (sec->flags & SEC_ALLOC) != 0
1908 && (sec->flags & SEC_READONLY) != 0)
1911 name = h->root.root.string;
1913 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1914 (*_bfd_error_handler)
1915 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1916 abfd, x86_64_elf_howto_table[r_type].name, name);
1917 bfd_set_error (bfd_error_bad_value);
1925 case R_X86_64_PC32_BND:
1929 if (h != NULL && info->executable)
1931 /* If this reloc is in a read-only section, we might
1932 need a copy reloc. We can't check reliably at this
1933 stage whether the section is read-only, as input
1934 sections have not yet been mapped to output sections.
1935 Tentatively set the flag for now, and correct in
1936 adjust_dynamic_symbol. */
1939 /* We may need a .plt entry if the function this reloc
1940 refers to is in a shared lib. */
1941 h->plt.refcount += 1;
1942 if (r_type != R_X86_64_PC32
1943 && r_type != R_X86_64_PC32_BND
1944 && r_type != R_X86_64_PC64)
1945 h->pointer_equality_needed = 1;
1950 /* If we are creating a shared library, and this is a reloc
1951 against a global symbol, or a non PC relative reloc
1952 against a local symbol, then we need to copy the reloc
1953 into the shared library. However, if we are linking with
1954 -Bsymbolic, we do not need to copy a reloc against a
1955 global symbol which is defined in an object we are
1956 including in the link (i.e., DEF_REGULAR is set). At
1957 this point we have not seen all the input files, so it is
1958 possible that DEF_REGULAR is not set now but will be set
1959 later (it is never cleared). In case of a weak definition,
1960 DEF_REGULAR may be cleared later by a strong definition in
1961 a shared library. We account for that possibility below by
1962 storing information in the relocs_copied field of the hash
1963 table entry. A similar situation occurs when creating
1964 shared libraries and symbol visibility changes render the
1967 If on the other hand, we are creating an executable, we
1968 may need to keep relocations for symbols satisfied by a
1969 dynamic library if we manage to avoid copy relocs for the
1972 && (sec->flags & SEC_ALLOC) != 0
1973 && (! IS_X86_64_PCREL_TYPE (r_type)
1975 && (! SYMBOLIC_BIND (info, h)
1976 || h->root.type == bfd_link_hash_defweak
1977 || !h->def_regular))))
1978 || (ELIMINATE_COPY_RELOCS
1980 && (sec->flags & SEC_ALLOC) != 0
1982 && (h->root.type == bfd_link_hash_defweak
1983 || !h->def_regular)))
1985 struct elf_dyn_relocs *p;
1986 struct elf_dyn_relocs **head;
1988 /* We must copy these reloc types into the output file.
1989 Create a reloc section in dynobj and make room for
1993 if (htab->elf.dynobj == NULL)
1994 htab->elf.dynobj = abfd;
1996 sreloc = _bfd_elf_make_dynamic_reloc_section
1997 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1998 abfd, /*rela?*/ TRUE);
2004 /* If this is a global symbol, we count the number of
2005 relocations we need for this symbol. */
2008 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
2012 /* Track dynamic relocs needed for local syms too.
2013 We really need local syms available to do this
2018 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2023 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2027 /* Beware of type punned pointers vs strict aliasing
2029 vpp = &(elf_section_data (s)->local_dynrel);
2030 head = (struct elf_dyn_relocs **)vpp;
2034 if (p == NULL || p->sec != sec)
2036 bfd_size_type amt = sizeof *p;
2038 p = ((struct elf_dyn_relocs *)
2039 bfd_alloc (htab->elf.dynobj, amt));
2050 /* Count size relocation as PC-relative relocation. */
2051 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2056 /* This relocation describes the C++ object vtable hierarchy.
2057 Reconstruct it for later use during GC. */
2058 case R_X86_64_GNU_VTINHERIT:
2059 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2063 /* This relocation describes which C++ vtable entries are actually
2064 used. Record for later use during GC. */
2065 case R_X86_64_GNU_VTENTRY:
2066 BFD_ASSERT (h != NULL);
2068 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2078 && h->plt.refcount > 0
2079 && h->got.refcount > 0
2080 && htab->plt_got == NULL)
2082 /* Create the GOT procedure linkage table. */
2083 unsigned int plt_got_align;
2084 const struct elf_backend_data *bed;
2086 bed = get_elf_backend_data (info->output_bfd);
2087 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry) == 8
2088 && (sizeof (elf_x86_64_bnd_plt2_entry)
2089 == sizeof (elf_x86_64_legacy_plt2_entry)));
2092 if (htab->elf.dynobj == NULL)
2093 htab->elf.dynobj = abfd;
2095 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2097 (bed->dynamic_sec_flags
2102 if (htab->plt_got == NULL
2103 || !bfd_set_section_alignment (htab->elf.dynobj,
2113 /* Return the section that should be marked against GC for a given
2117 elf_x86_64_gc_mark_hook (asection *sec,
2118 struct bfd_link_info *info,
2119 Elf_Internal_Rela *rel,
2120 struct elf_link_hash_entry *h,
2121 Elf_Internal_Sym *sym)
2124 switch (ELF32_R_TYPE (rel->r_info))
2126 case R_X86_64_GNU_VTINHERIT:
2127 case R_X86_64_GNU_VTENTRY:
2131 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2134 /* Update the got entry reference counts for the section being removed. */
2137 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
2139 const Elf_Internal_Rela *relocs)
2141 struct elf_x86_64_link_hash_table *htab;
2142 Elf_Internal_Shdr *symtab_hdr;
2143 struct elf_link_hash_entry **sym_hashes;
2144 bfd_signed_vma *local_got_refcounts;
2145 const Elf_Internal_Rela *rel, *relend;
2147 if (info->relocatable)
2150 htab = elf_x86_64_hash_table (info);
2154 elf_section_data (sec)->local_dynrel = NULL;
2156 symtab_hdr = &elf_symtab_hdr (abfd);
2157 sym_hashes = elf_sym_hashes (abfd);
2158 local_got_refcounts = elf_local_got_refcounts (abfd);
2160 htab = elf_x86_64_hash_table (info);
2161 relend = relocs + sec->reloc_count;
2162 for (rel = relocs; rel < relend; rel++)
2164 unsigned long r_symndx;
2165 unsigned int r_type;
2166 struct elf_link_hash_entry *h = NULL;
2168 r_symndx = htab->r_sym (rel->r_info);
2169 if (r_symndx >= symtab_hdr->sh_info)
2171 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2172 while (h->root.type == bfd_link_hash_indirect
2173 || h->root.type == bfd_link_hash_warning)
2174 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2178 /* A local symbol. */
2179 Elf_Internal_Sym *isym;
2181 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2184 /* Check relocation against local STT_GNU_IFUNC symbol. */
2186 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2188 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2196 struct elf_x86_64_link_hash_entry *eh;
2197 struct elf_dyn_relocs **pp;
2198 struct elf_dyn_relocs *p;
2200 eh = (struct elf_x86_64_link_hash_entry *) h;
2202 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2205 /* Everything must go for SEC. */
2211 r_type = ELF32_R_TYPE (rel->r_info);
2212 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2213 symtab_hdr, sym_hashes,
2214 &r_type, GOT_UNKNOWN,
2215 rel, relend, h, r_symndx))
2220 case R_X86_64_TLSLD:
2221 if (htab->tls_ld_got.refcount > 0)
2222 htab->tls_ld_got.refcount -= 1;
2225 case R_X86_64_TLSGD:
2226 case R_X86_64_GOTPC32_TLSDESC:
2227 case R_X86_64_TLSDESC_CALL:
2228 case R_X86_64_GOTTPOFF:
2229 case R_X86_64_GOT32:
2230 case R_X86_64_GOTPCREL:
2231 case R_X86_64_GOT64:
2232 case R_X86_64_GOTPCREL64:
2233 case R_X86_64_GOTPLT64:
2236 if (h->got.refcount > 0)
2237 h->got.refcount -= 1;
2238 if (h->type == STT_GNU_IFUNC)
2240 if (h->plt.refcount > 0)
2241 h->plt.refcount -= 1;
2244 else if (local_got_refcounts != NULL)
2246 if (local_got_refcounts[r_symndx] > 0)
2247 local_got_refcounts[r_symndx] -= 1;
2259 case R_X86_64_PC32_BND:
2261 case R_X86_64_SIZE32:
2262 case R_X86_64_SIZE64:
2264 && (h == NULL || h->type != STT_GNU_IFUNC))
2268 case R_X86_64_PLT32:
2269 case R_X86_64_PLT32_BND:
2270 case R_X86_64_PLTOFF64:
2273 if (h->plt.refcount > 0)
2274 h->plt.refcount -= 1;
2286 /* Adjust a symbol defined by a dynamic object and referenced by a
2287 regular object. The current definition is in some section of the
2288 dynamic object, but we're not including those sections. We have to
2289 change the definition to something the rest of the link can
2293 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2294 struct elf_link_hash_entry *h)
2296 struct elf_x86_64_link_hash_table *htab;
2298 struct elf_x86_64_link_hash_entry *eh;
2299 struct elf_dyn_relocs *p;
2301 /* STT_GNU_IFUNC symbol must go through PLT. */
2302 if (h->type == STT_GNU_IFUNC)
2304 /* All local STT_GNU_IFUNC references must be treate as local
2305 calls via local PLT. */
2307 && SYMBOL_CALLS_LOCAL (info, h))
2309 bfd_size_type pc_count = 0, count = 0;
2310 struct elf_dyn_relocs **pp;
2312 eh = (struct elf_x86_64_link_hash_entry *) h;
2313 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2315 pc_count += p->pc_count;
2316 p->count -= p->pc_count;
2325 if (pc_count || count)
2329 if (h->plt.refcount <= 0)
2330 h->plt.refcount = 1;
2332 h->plt.refcount += 1;
2336 if (h->plt.refcount <= 0)
2338 h->plt.offset = (bfd_vma) -1;
2344 /* If this is a function, put it in the procedure linkage table. We
2345 will fill in the contents of the procedure linkage table later,
2346 when we know the address of the .got section. */
2347 if (h->type == STT_FUNC
2350 if (h->plt.refcount <= 0
2351 || SYMBOL_CALLS_LOCAL (info, h)
2352 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2353 && h->root.type == bfd_link_hash_undefweak))
2355 /* This case can occur if we saw a PLT32 reloc in an input
2356 file, but the symbol was never referred to by a dynamic
2357 object, or if all references were garbage collected. In
2358 such a case, we don't actually need to build a procedure
2359 linkage table, and we can just do a PC32 reloc instead. */
2360 h->plt.offset = (bfd_vma) -1;
2367 /* It's possible that we incorrectly decided a .plt reloc was
2368 needed for an R_X86_64_PC32 reloc to a non-function sym in
2369 check_relocs. We can't decide accurately between function and
2370 non-function syms in check-relocs; Objects loaded later in
2371 the link may change h->type. So fix it now. */
2372 h->plt.offset = (bfd_vma) -1;
2374 /* If this is a weak symbol, and there is a real definition, the
2375 processor independent code will have arranged for us to see the
2376 real definition first, and we can just use the same value. */
2377 if (h->u.weakdef != NULL)
2379 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2380 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2381 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2382 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2383 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2385 eh = (struct elf_x86_64_link_hash_entry *) h;
2386 h->non_got_ref = h->u.weakdef->non_got_ref;
2387 eh->needs_copy = h->u.weakdef->needs_copy;
2392 /* This is a reference to a symbol defined by a dynamic object which
2393 is not a function. */
2395 /* If we are creating a shared library, we must presume that the
2396 only references to the symbol are via the global offset table.
2397 For such cases we need not do anything here; the relocations will
2398 be handled correctly by relocate_section. */
2399 if (!info->executable)
2402 /* If there are no references to this symbol that do not use the
2403 GOT, we don't need to generate a copy reloc. */
2404 if (!h->non_got_ref)
2407 /* If -z nocopyreloc was given, we won't generate them either. */
2408 if (info->nocopyreloc)
2414 if (ELIMINATE_COPY_RELOCS)
2416 eh = (struct elf_x86_64_link_hash_entry *) h;
2417 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2419 s = p->sec->output_section;
2420 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2424 /* If we didn't find any dynamic relocs in read-only sections, then
2425 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2433 /* We must allocate the symbol in our .dynbss section, which will
2434 become part of the .bss section of the executable. There will be
2435 an entry for this symbol in the .dynsym section. The dynamic
2436 object will contain position independent code, so all references
2437 from the dynamic object to this symbol will go through the global
2438 offset table. The dynamic linker will use the .dynsym entry to
2439 determine the address it must put in the global offset table, so
2440 both the dynamic object and the regular object will refer to the
2441 same memory location for the variable. */
2443 htab = elf_x86_64_hash_table (info);
2447 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2448 to copy the initial value out of the dynamic object and into the
2449 runtime process image. */
2450 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2452 const struct elf_backend_data *bed;
2453 bed = get_elf_backend_data (info->output_bfd);
2454 htab->srelbss->size += bed->s->sizeof_rela;
2460 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2463 /* Allocate space in .plt, .got and associated reloc sections for
2467 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2469 struct bfd_link_info *info;
2470 struct elf_x86_64_link_hash_table *htab;
2471 struct elf_x86_64_link_hash_entry *eh;
2472 struct elf_dyn_relocs *p;
2473 const struct elf_backend_data *bed;
2474 unsigned int plt_entry_size;
2476 if (h->root.type == bfd_link_hash_indirect)
2479 eh = (struct elf_x86_64_link_hash_entry *) h;
2481 info = (struct bfd_link_info *) inf;
2482 htab = elf_x86_64_hash_table (info);
2485 bed = get_elf_backend_data (info->output_bfd);
2486 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2488 /* We can't use the GOT PLT if pointer equality is needed since
2489 finish_dynamic_symbol won't clear symbol value and the dynamic
2490 linker won't update the GOT slot. We will get into an infinite
2491 loop at run-time. */
2492 if (htab->plt_got != NULL
2493 && h->type != STT_GNU_IFUNC
2494 && !h->pointer_equality_needed
2495 && h->plt.refcount > 0
2496 && h->got.refcount > 0)
2498 /* Don't use the regular PLT if there are both GOT and GOTPLT
2500 h->plt.offset = (bfd_vma) -1;
2502 /* Use the GOT PLT. */
2503 eh->plt_got.refcount = 1;
2506 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2507 here if it is defined and referenced in a non-shared object. */
2508 if (h->type == STT_GNU_IFUNC
2511 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2517 asection *s = htab->plt_bnd;
2518 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2520 /* Use the .plt.bnd section if it is created. */
2521 eh->plt_bnd.offset = s->size;
2523 /* Make room for this entry in the .plt.bnd section. */
2524 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2532 else if (htab->elf.dynamic_sections_created
2533 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2535 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2537 /* Make sure this symbol is output as a dynamic symbol.
2538 Undefined weak syms won't yet be marked as dynamic. */
2539 if (h->dynindx == -1
2540 && !h->forced_local)
2542 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2547 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2549 asection *s = htab->elf.splt;
2550 asection *bnd_s = htab->plt_bnd;
2551 asection *got_s = htab->plt_got;
2553 /* If this is the first .plt entry, make room for the special
2556 s->size = plt_entry_size;
2559 eh->plt_got.offset = got_s->size;
2562 h->plt.offset = s->size;
2564 eh->plt_bnd.offset = bnd_s->size;
2567 /* If this symbol is not defined in a regular file, and we are
2568 not generating a shared library, then set the symbol to this
2569 location in the .plt. This is required to make function
2570 pointers compare as equal between the normal executable and
2571 the shared library. */
2577 /* We need to make a call to the entry of the GOT PLT
2578 instead of regular PLT entry. */
2579 h->root.u.def.section = got_s;
2580 h->root.u.def.value = eh->plt_got.offset;
2586 /* We need to make a call to the entry of the second
2587 PLT instead of regular PLT entry. */
2588 h->root.u.def.section = bnd_s;
2589 h->root.u.def.value = eh->plt_bnd.offset;
2593 h->root.u.def.section = s;
2594 h->root.u.def.value = h->plt.offset;
2599 /* Make room for this entry. */
2601 got_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2604 s->size += plt_entry_size;
2606 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2608 /* We also need to make an entry in the .got.plt section,
2609 which will be placed in the .got section by the linker
2611 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2613 /* We also need to make an entry in the .rela.plt
2615 htab->elf.srelplt->size += bed->s->sizeof_rela;
2616 htab->elf.srelplt->reloc_count++;
2621 h->plt.offset = (bfd_vma) -1;
2627 h->plt.offset = (bfd_vma) -1;
2631 eh->tlsdesc_got = (bfd_vma) -1;
2633 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2634 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2635 if (h->got.refcount > 0
2638 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2640 h->got.offset = (bfd_vma) -1;
2642 else if (h->got.refcount > 0)
2646 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2648 /* Make sure this symbol is output as a dynamic symbol.
2649 Undefined weak syms won't yet be marked as dynamic. */
2650 if (h->dynindx == -1
2651 && !h->forced_local)
2653 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2657 if (GOT_TLS_GDESC_P (tls_type))
2659 eh->tlsdesc_got = htab->elf.sgotplt->size
2660 - elf_x86_64_compute_jump_table_size (htab);
2661 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2662 h->got.offset = (bfd_vma) -2;
2664 if (! GOT_TLS_GDESC_P (tls_type)
2665 || GOT_TLS_GD_P (tls_type))
2668 h->got.offset = s->size;
2669 s->size += GOT_ENTRY_SIZE;
2670 if (GOT_TLS_GD_P (tls_type))
2671 s->size += GOT_ENTRY_SIZE;
2673 dyn = htab->elf.dynamic_sections_created;
2674 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2676 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2677 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2678 || tls_type == GOT_TLS_IE)
2679 htab->elf.srelgot->size += bed->s->sizeof_rela;
2680 else if (GOT_TLS_GD_P (tls_type))
2681 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2682 else if (! GOT_TLS_GDESC_P (tls_type)
2683 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2684 || h->root.type != bfd_link_hash_undefweak)
2686 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2687 htab->elf.srelgot->size += bed->s->sizeof_rela;
2688 if (GOT_TLS_GDESC_P (tls_type))
2690 htab->elf.srelplt->size += bed->s->sizeof_rela;
2691 htab->tlsdesc_plt = (bfd_vma) -1;
2695 h->got.offset = (bfd_vma) -1;
2697 if (eh->dyn_relocs == NULL)
2700 /* In the shared -Bsymbolic case, discard space allocated for
2701 dynamic pc-relative relocs against symbols which turn out to be
2702 defined in regular objects. For the normal shared case, discard
2703 space for pc-relative relocs that have become local due to symbol
2704 visibility changes. */
2708 /* Relocs that use pc_count are those that appear on a call
2709 insn, or certain REL relocs that can generated via assembly.
2710 We want calls to protected symbols to resolve directly to the
2711 function rather than going via the plt. If people want
2712 function pointer comparisons to work as expected then they
2713 should avoid writing weird assembly. */
2714 if (SYMBOL_CALLS_LOCAL (info, h))
2716 struct elf_dyn_relocs **pp;
2718 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2720 p->count -= p->pc_count;
2729 /* Also discard relocs on undefined weak syms with non-default
2731 if (eh->dyn_relocs != NULL)
2733 if (h->root.type == bfd_link_hash_undefweak)
2735 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2736 eh->dyn_relocs = NULL;
2738 /* Make sure undefined weak symbols are output as a dynamic
2740 else if (h->dynindx == -1
2741 && ! h->forced_local
2742 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2745 /* For PIE, discard space for pc-relative relocs against
2746 symbols which turn out to need copy relocs. */
2747 else if (info->executable
2748 && (h->needs_copy || eh->needs_copy)
2752 struct elf_dyn_relocs **pp;
2754 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2756 if (p->pc_count != 0)
2764 else if (ELIMINATE_COPY_RELOCS)
2766 /* For the non-shared case, discard space for relocs against
2767 symbols which turn out to need copy relocs or are not
2773 || (htab->elf.dynamic_sections_created
2774 && (h->root.type == bfd_link_hash_undefweak
2775 || h->root.type == bfd_link_hash_undefined))))
2777 /* Make sure this symbol is output as a dynamic symbol.
2778 Undefined weak syms won't yet be marked as dynamic. */
2779 if (h->dynindx == -1
2780 && ! h->forced_local
2781 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2784 /* If that succeeded, we know we'll be keeping all the
2786 if (h->dynindx != -1)
2790 eh->dyn_relocs = NULL;
2795 /* Finally, allocate space. */
2796 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2800 sreloc = elf_section_data (p->sec)->sreloc;
2802 BFD_ASSERT (sreloc != NULL);
2804 sreloc->size += p->count * bed->s->sizeof_rela;
2810 /* Allocate space in .plt, .got and associated reloc sections for
2811 local dynamic relocs. */
2814 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2816 struct elf_link_hash_entry *h
2817 = (struct elf_link_hash_entry *) *slot;
2819 if (h->type != STT_GNU_IFUNC
2823 || h->root.type != bfd_link_hash_defined)
2826 return elf_x86_64_allocate_dynrelocs (h, inf);
2829 /* Find any dynamic relocs that apply to read-only sections. */
2832 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2835 struct elf_x86_64_link_hash_entry *eh;
2836 struct elf_dyn_relocs *p;
2838 /* Skip local IFUNC symbols. */
2839 if (h->forced_local && h->type == STT_GNU_IFUNC)
2842 eh = (struct elf_x86_64_link_hash_entry *) h;
2843 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2845 asection *s = p->sec->output_section;
2847 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2849 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2851 info->flags |= DF_TEXTREL;
2853 if ((info->warn_shared_textrel && info->shared)
2854 || info->error_textrel)
2855 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2856 p->sec->owner, h->root.root.string,
2859 /* Not an error, just cut short the traversal. */
2867 mov foo@GOTPCREL(%rip), %reg
2870 with the local symbol, foo. */
2873 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2874 struct bfd_link_info *link_info)
2876 Elf_Internal_Shdr *symtab_hdr;
2877 Elf_Internal_Rela *internal_relocs;
2878 Elf_Internal_Rela *irel, *irelend;
2880 struct elf_x86_64_link_hash_table *htab;
2881 bfd_boolean changed_contents;
2882 bfd_boolean changed_relocs;
2883 bfd_signed_vma *local_got_refcounts;
2885 /* Don't even try to convert non-ELF outputs. */
2886 if (!is_elf_hash_table (link_info->hash))
2889 /* Nothing to do if there are no codes, no relocations or no output. */
2890 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2891 || sec->reloc_count == 0
2892 || bfd_is_abs_section (sec->output_section))
2895 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2897 /* Load the relocations for this section. */
2898 internal_relocs = (_bfd_elf_link_read_relocs
2899 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2900 link_info->keep_memory));
2901 if (internal_relocs == NULL)
2904 htab = elf_x86_64_hash_table (link_info);
2905 changed_contents = FALSE;
2906 changed_relocs = FALSE;
2907 local_got_refcounts = elf_local_got_refcounts (abfd);
2909 /* Get the section contents. */
2910 if (elf_section_data (sec)->this_hdr.contents != NULL)
2911 contents = elf_section_data (sec)->this_hdr.contents;
2914 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2918 irelend = internal_relocs + sec->reloc_count;
2919 for (irel = internal_relocs; irel < irelend; irel++)
2921 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2922 unsigned int r_symndx = htab->r_sym (irel->r_info);
2924 struct elf_link_hash_entry *h;
2926 if (r_type != R_X86_64_GOTPCREL)
2929 /* Get the symbol referred to by the reloc. */
2930 if (r_symndx < symtab_hdr->sh_info)
2932 Elf_Internal_Sym *isym;
2934 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2937 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2938 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2939 && irel->r_offset >= 2
2940 && bfd_get_8 (input_bfd,
2941 contents + irel->r_offset - 2) == 0x8b)
2943 bfd_put_8 (output_bfd, 0x8d,
2944 contents + irel->r_offset - 2);
2945 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2946 if (local_got_refcounts != NULL
2947 && local_got_refcounts[r_symndx] > 0)
2948 local_got_refcounts[r_symndx] -= 1;
2949 changed_contents = TRUE;
2950 changed_relocs = TRUE;
2955 indx = r_symndx - symtab_hdr->sh_info;
2956 h = elf_sym_hashes (abfd)[indx];
2957 BFD_ASSERT (h != NULL);
2959 while (h->root.type == bfd_link_hash_indirect
2960 || h->root.type == bfd_link_hash_warning)
2961 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2963 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2964 avoid optimizing _DYNAMIC since ld.so may use its link-time
2967 && h->type != STT_GNU_IFUNC
2968 && h != htab->elf.hdynamic
2969 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2970 && irel->r_offset >= 2
2971 && bfd_get_8 (input_bfd,
2972 contents + irel->r_offset - 2) == 0x8b)
2974 bfd_put_8 (output_bfd, 0x8d,
2975 contents + irel->r_offset - 2);
2976 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2977 if (h->got.refcount > 0)
2978 h->got.refcount -= 1;
2979 changed_contents = TRUE;
2980 changed_relocs = TRUE;
2984 if (contents != NULL
2985 && elf_section_data (sec)->this_hdr.contents != contents)
2987 if (!changed_contents && !link_info->keep_memory)
2991 /* Cache the section contents for elf_link_input_bfd. */
2992 elf_section_data (sec)->this_hdr.contents = contents;
2996 if (elf_section_data (sec)->relocs != internal_relocs)
2998 if (!changed_relocs)
2999 free (internal_relocs);
3001 elf_section_data (sec)->relocs = internal_relocs;
3007 if (contents != NULL
3008 && elf_section_data (sec)->this_hdr.contents != contents)
3010 if (internal_relocs != NULL
3011 && elf_section_data (sec)->relocs != internal_relocs)
3012 free (internal_relocs);
3016 /* Set the sizes of the dynamic sections. */
3019 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3020 struct bfd_link_info *info)
3022 struct elf_x86_64_link_hash_table *htab;
3027 const struct elf_backend_data *bed;
3029 htab = elf_x86_64_hash_table (info);
3032 bed = get_elf_backend_data (output_bfd);
3034 dynobj = htab->elf.dynobj;
3038 if (htab->elf.dynamic_sections_created)
3040 /* Set the contents of the .interp section to the interpreter. */
3041 if (info->executable)
3043 s = bfd_get_linker_section (dynobj, ".interp");
3046 s->size = htab->dynamic_interpreter_size;
3047 s->contents = (unsigned char *) htab->dynamic_interpreter;
3051 /* Set up .got offsets for local syms, and space for local dynamic
3053 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3055 bfd_signed_vma *local_got;
3056 bfd_signed_vma *end_local_got;
3057 char *local_tls_type;
3058 bfd_vma *local_tlsdesc_gotent;
3059 bfd_size_type locsymcount;
3060 Elf_Internal_Shdr *symtab_hdr;
3063 if (! is_x86_64_elf (ibfd))
3066 for (s = ibfd->sections; s != NULL; s = s->next)
3068 struct elf_dyn_relocs *p;
3070 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
3073 for (p = (struct elf_dyn_relocs *)
3074 (elf_section_data (s)->local_dynrel);
3078 if (!bfd_is_abs_section (p->sec)
3079 && bfd_is_abs_section (p->sec->output_section))
3081 /* Input section has been discarded, either because
3082 it is a copy of a linkonce section or due to
3083 linker script /DISCARD/, so we'll be discarding
3086 else if (p->count != 0)
3088 srel = elf_section_data (p->sec)->sreloc;
3089 srel->size += p->count * bed->s->sizeof_rela;
3090 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3091 && (info->flags & DF_TEXTREL) == 0)
3093 info->flags |= DF_TEXTREL;
3094 if ((info->warn_shared_textrel && info->shared)
3095 || info->error_textrel)
3096 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3097 p->sec->owner, p->sec);
3103 local_got = elf_local_got_refcounts (ibfd);
3107 symtab_hdr = &elf_symtab_hdr (ibfd);
3108 locsymcount = symtab_hdr->sh_info;
3109 end_local_got = local_got + locsymcount;
3110 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3111 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3113 srel = htab->elf.srelgot;
3114 for (; local_got < end_local_got;
3115 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3117 *local_tlsdesc_gotent = (bfd_vma) -1;
3120 if (GOT_TLS_GDESC_P (*local_tls_type))
3122 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3123 - elf_x86_64_compute_jump_table_size (htab);
3124 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3125 *local_got = (bfd_vma) -2;
3127 if (! GOT_TLS_GDESC_P (*local_tls_type)
3128 || GOT_TLS_GD_P (*local_tls_type))
3130 *local_got = s->size;
3131 s->size += GOT_ENTRY_SIZE;
3132 if (GOT_TLS_GD_P (*local_tls_type))
3133 s->size += GOT_ENTRY_SIZE;
3136 || GOT_TLS_GD_ANY_P (*local_tls_type)
3137 || *local_tls_type == GOT_TLS_IE)
3139 if (GOT_TLS_GDESC_P (*local_tls_type))
3141 htab->elf.srelplt->size
3142 += bed->s->sizeof_rela;
3143 htab->tlsdesc_plt = (bfd_vma) -1;
3145 if (! GOT_TLS_GDESC_P (*local_tls_type)
3146 || GOT_TLS_GD_P (*local_tls_type))
3147 srel->size += bed->s->sizeof_rela;
3151 *local_got = (bfd_vma) -1;
3155 if (htab->tls_ld_got.refcount > 0)
3157 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3159 htab->tls_ld_got.offset = htab->elf.sgot->size;
3160 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3161 htab->elf.srelgot->size += bed->s->sizeof_rela;
3164 htab->tls_ld_got.offset = -1;
3166 /* Allocate global sym .plt and .got entries, and space for global
3167 sym dynamic relocs. */
3168 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3171 /* Allocate .plt and .got entries, and space for local symbols. */
3172 htab_traverse (htab->loc_hash_table,
3173 elf_x86_64_allocate_local_dynrelocs,
3176 /* For every jump slot reserved in the sgotplt, reloc_count is
3177 incremented. However, when we reserve space for TLS descriptors,
3178 it's not incremented, so in order to compute the space reserved
3179 for them, it suffices to multiply the reloc count by the jump
3182 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3183 so that R_X86_64_IRELATIVE entries come last. */
3184 if (htab->elf.srelplt)
3186 htab->sgotplt_jump_table_size
3187 = elf_x86_64_compute_jump_table_size (htab);
3188 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3190 else if (htab->elf.irelplt)
3191 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3193 if (htab->tlsdesc_plt)
3195 /* If we're not using lazy TLS relocations, don't generate the
3196 PLT and GOT entries they require. */
3197 if ((info->flags & DF_BIND_NOW))
3198 htab->tlsdesc_plt = 0;
3201 htab->tlsdesc_got = htab->elf.sgot->size;
3202 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3203 /* Reserve room for the initial entry.
3204 FIXME: we could probably do away with it in this case. */
3205 if (htab->elf.splt->size == 0)
3206 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3207 htab->tlsdesc_plt = htab->elf.splt->size;
3208 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3212 if (htab->elf.sgotplt)
3214 /* Don't allocate .got.plt section if there are no GOT nor PLT
3215 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3216 if ((htab->elf.hgot == NULL
3217 || !htab->elf.hgot->ref_regular_nonweak)
3218 && (htab->elf.sgotplt->size
3219 == get_elf_backend_data (output_bfd)->got_header_size)
3220 && (htab->elf.splt == NULL
3221 || htab->elf.splt->size == 0)
3222 && (htab->elf.sgot == NULL
3223 || htab->elf.sgot->size == 0)
3224 && (htab->elf.iplt == NULL
3225 || htab->elf.iplt->size == 0)
3226 && (htab->elf.igotplt == NULL
3227 || htab->elf.igotplt->size == 0))
3228 htab->elf.sgotplt->size = 0;
3231 if (htab->plt_eh_frame != NULL
3232 && htab->elf.splt != NULL
3233 && htab->elf.splt->size != 0
3234 && !bfd_is_abs_section (htab->elf.splt->output_section)
3235 && _bfd_elf_eh_frame_present (info))
3237 const struct elf_x86_64_backend_data *arch_data
3238 = get_elf_x86_64_arch_data (bed);
3239 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3242 /* We now have determined the sizes of the various dynamic sections.
3243 Allocate memory for them. */
3245 for (s = dynobj->sections; s != NULL; s = s->next)
3247 if ((s->flags & SEC_LINKER_CREATED) == 0)
3250 if (s == htab->elf.splt
3251 || s == htab->elf.sgot
3252 || s == htab->elf.sgotplt
3253 || s == htab->elf.iplt
3254 || s == htab->elf.igotplt
3255 || s == htab->plt_bnd
3256 || s == htab->plt_got
3257 || s == htab->plt_eh_frame
3258 || s == htab->sdynbss)
3260 /* Strip this section if we don't need it; see the
3263 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3265 if (s->size != 0 && s != htab->elf.srelplt)
3268 /* We use the reloc_count field as a counter if we need
3269 to copy relocs into the output file. */
3270 if (s != htab->elf.srelplt)
3275 /* It's not one of our sections, so don't allocate space. */
3281 /* If we don't need this section, strip it from the
3282 output file. This is mostly to handle .rela.bss and
3283 .rela.plt. We must create both sections in
3284 create_dynamic_sections, because they must be created
3285 before the linker maps input sections to output
3286 sections. The linker does that before
3287 adjust_dynamic_symbol is called, and it is that
3288 function which decides whether anything needs to go
3289 into these sections. */
3291 s->flags |= SEC_EXCLUDE;
3295 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3298 /* Allocate memory for the section contents. We use bfd_zalloc
3299 here in case unused entries are not reclaimed before the
3300 section's contents are written out. This should not happen,
3301 but this way if it does, we get a R_X86_64_NONE reloc instead
3303 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3304 if (s->contents == NULL)
3308 if (htab->plt_eh_frame != NULL
3309 && htab->plt_eh_frame->contents != NULL)
3311 const struct elf_x86_64_backend_data *arch_data
3312 = get_elf_x86_64_arch_data (bed);
3314 memcpy (htab->plt_eh_frame->contents,
3315 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3316 bfd_put_32 (dynobj, htab->elf.splt->size,
3317 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3320 if (htab->elf.dynamic_sections_created)
3322 /* Add some entries to the .dynamic section. We fill in the
3323 values later, in elf_x86_64_finish_dynamic_sections, but we
3324 must add the entries now so that we get the correct size for
3325 the .dynamic section. The DT_DEBUG entry is filled in by the
3326 dynamic linker and used by the debugger. */
3327 #define add_dynamic_entry(TAG, VAL) \
3328 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3330 if (info->executable)
3332 if (!add_dynamic_entry (DT_DEBUG, 0))
3336 if (htab->elf.splt->size != 0)
3338 if (!add_dynamic_entry (DT_PLTGOT, 0)
3339 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3340 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3341 || !add_dynamic_entry (DT_JMPREL, 0))
3344 if (htab->tlsdesc_plt
3345 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3346 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3352 if (!add_dynamic_entry (DT_RELA, 0)
3353 || !add_dynamic_entry (DT_RELASZ, 0)
3354 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3357 /* If any dynamic relocs apply to a read-only section,
3358 then we need a DT_TEXTREL entry. */
3359 if ((info->flags & DF_TEXTREL) == 0)
3360 elf_link_hash_traverse (&htab->elf,
3361 elf_x86_64_readonly_dynrelocs,
3364 if ((info->flags & DF_TEXTREL) != 0)
3366 if (!add_dynamic_entry (DT_TEXTREL, 0))
3371 #undef add_dynamic_entry
3377 elf_x86_64_always_size_sections (bfd *output_bfd,
3378 struct bfd_link_info *info)
3380 asection *tls_sec = elf_hash_table (info)->tls_sec;
3384 struct elf_link_hash_entry *tlsbase;
3386 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3387 "_TLS_MODULE_BASE_",
3388 FALSE, FALSE, FALSE);
3390 if (tlsbase && tlsbase->type == STT_TLS)
3392 struct elf_x86_64_link_hash_table *htab;
3393 struct bfd_link_hash_entry *bh = NULL;
3394 const struct elf_backend_data *bed
3395 = get_elf_backend_data (output_bfd);
3397 htab = elf_x86_64_hash_table (info);
3401 if (!(_bfd_generic_link_add_one_symbol
3402 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3403 tls_sec, 0, NULL, FALSE,
3404 bed->collect, &bh)))
3407 htab->tls_module_base = bh;
3409 tlsbase = (struct elf_link_hash_entry *)bh;
3410 tlsbase->def_regular = 1;
3411 tlsbase->other = STV_HIDDEN;
3412 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3419 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3420 executables. Rather than setting it to the beginning of the TLS
3421 section, we have to set it to the end. This function may be called
3422 multiple times, it is idempotent. */
3425 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3427 struct elf_x86_64_link_hash_table *htab;
3428 struct bfd_link_hash_entry *base;
3430 if (!info->executable)
3433 htab = elf_x86_64_hash_table (info);
3437 base = htab->tls_module_base;
3441 base->u.def.value = htab->elf.tls_size;
3444 /* Return the base VMA address which should be subtracted from real addresses
3445 when resolving @dtpoff relocation.
3446 This is PT_TLS segment p_vaddr. */
3449 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3451 /* If tls_sec is NULL, we should have signalled an error already. */
3452 if (elf_hash_table (info)->tls_sec == NULL)
3454 return elf_hash_table (info)->tls_sec->vma;
3457 /* Return the relocation value for @tpoff relocation
3458 if STT_TLS virtual address is ADDRESS. */
3461 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3463 struct elf_link_hash_table *htab = elf_hash_table (info);
3464 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3465 bfd_vma static_tls_size;
3467 /* If tls_segment is NULL, we should have signalled an error already. */
3468 if (htab->tls_sec == NULL)
3471 /* Consider special static TLS alignment requirements. */
3472 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3473 return address - static_tls_size - htab->tls_sec->vma;
3476 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3480 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3482 /* Opcode Instruction
3485 0x0f 0x8x conditional jump */
3487 && (contents [offset - 1] == 0xe8
3488 || contents [offset - 1] == 0xe9))
3490 && contents [offset - 2] == 0x0f
3491 && (contents [offset - 1] & 0xf0) == 0x80));
3494 /* Relocate an x86_64 ELF section. */
3497 elf_x86_64_relocate_section (bfd *output_bfd,
3498 struct bfd_link_info *info,
3500 asection *input_section,
3502 Elf_Internal_Rela *relocs,
3503 Elf_Internal_Sym *local_syms,
3504 asection **local_sections)
3506 struct elf_x86_64_link_hash_table *htab;
3507 Elf_Internal_Shdr *symtab_hdr;
3508 struct elf_link_hash_entry **sym_hashes;
3509 bfd_vma *local_got_offsets;
3510 bfd_vma *local_tlsdesc_gotents;
3511 Elf_Internal_Rela *rel;
3512 Elf_Internal_Rela *relend;
3513 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3515 BFD_ASSERT (is_x86_64_elf (input_bfd));
3517 htab = elf_x86_64_hash_table (info);
3520 symtab_hdr = &elf_symtab_hdr (input_bfd);
3521 sym_hashes = elf_sym_hashes (input_bfd);
3522 local_got_offsets = elf_local_got_offsets (input_bfd);
3523 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3525 elf_x86_64_set_tls_module_base (info);
3528 relend = relocs + input_section->reloc_count;
3529 for (; rel < relend; rel++)
3531 unsigned int r_type;
3532 reloc_howto_type *howto;
3533 unsigned long r_symndx;
3534 struct elf_link_hash_entry *h;
3535 struct elf_x86_64_link_hash_entry *eh;
3536 Elf_Internal_Sym *sym;
3538 bfd_vma off, offplt, plt_offset;
3540 bfd_boolean unresolved_reloc;
3541 bfd_reloc_status_type r;
3543 asection *base_got, *resolved_plt;
3546 r_type = ELF32_R_TYPE (rel->r_info);
3547 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3548 || r_type == (int) R_X86_64_GNU_VTENTRY)
3551 if (r_type >= (int) R_X86_64_standard)
3553 (*_bfd_error_handler)
3554 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3555 input_bfd, input_section, r_type);
3556 bfd_set_error (bfd_error_bad_value);
3560 if (r_type != (int) R_X86_64_32
3561 || ABI_64_P (output_bfd))
3562 howto = x86_64_elf_howto_table + r_type;
3564 howto = (x86_64_elf_howto_table
3565 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3566 r_symndx = htab->r_sym (rel->r_info);
3570 unresolved_reloc = FALSE;
3571 if (r_symndx < symtab_hdr->sh_info)
3573 sym = local_syms + r_symndx;
3574 sec = local_sections[r_symndx];
3576 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3578 st_size = sym->st_size;
3580 /* Relocate against local STT_GNU_IFUNC symbol. */
3581 if (!info->relocatable
3582 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3584 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3589 /* Set STT_GNU_IFUNC symbol value. */
3590 h->root.u.def.value = sym->st_value;
3591 h->root.u.def.section = sec;
3596 bfd_boolean warned ATTRIBUTE_UNUSED;
3597 bfd_boolean ignored ATTRIBUTE_UNUSED;
3599 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3600 r_symndx, symtab_hdr, sym_hashes,
3602 unresolved_reloc, warned, ignored);
3606 if (sec != NULL && discarded_section (sec))
3607 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3608 rel, 1, relend, howto, 0, contents);
3610 if (info->relocatable)
3613 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3615 if (r_type == R_X86_64_64)
3617 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3618 zero-extend it to 64bit if addend is zero. */
3619 r_type = R_X86_64_32;
3620 memset (contents + rel->r_offset + 4, 0, 4);
3622 else if (r_type == R_X86_64_SIZE64)
3624 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3625 zero-extend it to 64bit if addend is zero. */
3626 r_type = R_X86_64_SIZE32;
3627 memset (contents + rel->r_offset + 4, 0, 4);
3631 eh = (struct elf_x86_64_link_hash_entry *) h;
3633 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3634 it here if it is defined in a non-shared object. */
3636 && h->type == STT_GNU_IFUNC
3642 if ((input_section->flags & SEC_ALLOC) == 0
3643 || h->plt.offset == (bfd_vma) -1)
3646 /* STT_GNU_IFUNC symbol must go through PLT. */
3647 if (htab->elf.splt != NULL)
3649 if (htab->plt_bnd != NULL)
3651 resolved_plt = htab->plt_bnd;
3652 plt_offset = eh->plt_bnd.offset;
3656 resolved_plt = htab->elf.splt;
3657 plt_offset = h->plt.offset;
3662 resolved_plt = htab->elf.iplt;
3663 plt_offset = h->plt.offset;
3666 relocation = (resolved_plt->output_section->vma
3667 + resolved_plt->output_offset + plt_offset);
3672 if (h->root.root.string)
3673 name = h->root.root.string;
3675 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3677 (*_bfd_error_handler)
3678 (_("%B: relocation %s against STT_GNU_IFUNC "
3679 "symbol `%s' isn't handled by %s"), input_bfd,
3680 x86_64_elf_howto_table[r_type].name,
3681 name, __FUNCTION__);
3682 bfd_set_error (bfd_error_bad_value);
3691 if (ABI_64_P (output_bfd))
3695 if (rel->r_addend != 0)
3697 if (h->root.root.string)
3698 name = h->root.root.string;
3700 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3702 (*_bfd_error_handler)
3703 (_("%B: relocation %s against STT_GNU_IFUNC "
3704 "symbol `%s' has non-zero addend: %d"),
3705 input_bfd, x86_64_elf_howto_table[r_type].name,
3706 name, rel->r_addend);
3707 bfd_set_error (bfd_error_bad_value);
3711 /* Generate dynamic relcoation only when there is a
3712 non-GOT reference in a shared object. */
3713 if (info->shared && h->non_got_ref)
3715 Elf_Internal_Rela outrel;
3718 /* Need a dynamic relocation to get the real function
3720 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3724 if (outrel.r_offset == (bfd_vma) -1
3725 || outrel.r_offset == (bfd_vma) -2)
3728 outrel.r_offset += (input_section->output_section->vma
3729 + input_section->output_offset);
3731 if (h->dynindx == -1
3733 || info->executable)
3735 /* This symbol is resolved locally. */
3736 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3737 outrel.r_addend = (h->root.u.def.value
3738 + h->root.u.def.section->output_section->vma
3739 + h->root.u.def.section->output_offset);
3743 outrel.r_info = htab->r_info (h->dynindx, r_type);
3744 outrel.r_addend = 0;
3747 sreloc = htab->elf.irelifunc;
3748 elf_append_rela (output_bfd, sreloc, &outrel);
3750 /* If this reloc is against an external symbol, we
3751 do not want to fiddle with the addend. Otherwise,
3752 we need to include the symbol value so that it
3753 becomes an addend for the dynamic reloc. For an
3754 internal symbol, we have updated addend. */
3759 case R_X86_64_PC32_BND:
3761 case R_X86_64_PLT32:
3762 case R_X86_64_PLT32_BND:
3765 case R_X86_64_GOTPCREL:
3766 case R_X86_64_GOTPCREL64:
3767 base_got = htab->elf.sgot;
3768 off = h->got.offset;
3770 if (base_got == NULL)
3773 if (off == (bfd_vma) -1)
3775 /* We can't use h->got.offset here to save state, or
3776 even just remember the offset, as finish_dynamic_symbol
3777 would use that as offset into .got. */
3779 if (htab->elf.splt != NULL)
3781 plt_index = h->plt.offset / plt_entry_size - 1;
3782 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3783 base_got = htab->elf.sgotplt;
3787 plt_index = h->plt.offset / plt_entry_size;
3788 off = plt_index * GOT_ENTRY_SIZE;
3789 base_got = htab->elf.igotplt;
3792 if (h->dynindx == -1
3796 /* This references the local defitionion. We must
3797 initialize this entry in the global offset table.
3798 Since the offset must always be a multiple of 8,
3799 we use the least significant bit to record
3800 whether we have initialized it already.
3802 When doing a dynamic link, we create a .rela.got
3803 relocation entry to initialize the value. This
3804 is done in the finish_dynamic_symbol routine. */
3809 bfd_put_64 (output_bfd, relocation,
3810 base_got->contents + off);
3811 /* Note that this is harmless for the GOTPLT64
3812 case, as -1 | 1 still is -1. */
3818 relocation = (base_got->output_section->vma
3819 + base_got->output_offset + off);
3825 /* When generating a shared object, the relocations handled here are
3826 copied into the output file to be resolved at run time. */
3829 case R_X86_64_GOT32:
3830 case R_X86_64_GOT64:
3831 /* Relocation is to the entry for this symbol in the global
3833 case R_X86_64_GOTPCREL:
3834 case R_X86_64_GOTPCREL64:
3835 /* Use global offset table entry as symbol value. */
3836 case R_X86_64_GOTPLT64:
3837 /* This is obsolete and treated the the same as GOT64. */
3838 base_got = htab->elf.sgot;
3840 if (htab->elf.sgot == NULL)
3847 off = h->got.offset;
3849 && h->plt.offset != (bfd_vma)-1
3850 && off == (bfd_vma)-1)
3852 /* We can't use h->got.offset here to save
3853 state, or even just remember the offset, as
3854 finish_dynamic_symbol would use that as offset into
3856 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3857 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3858 base_got = htab->elf.sgotplt;
3861 dyn = htab->elf.dynamic_sections_created;
3863 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3865 && SYMBOL_REFERENCES_LOCAL (info, h))
3866 || (ELF_ST_VISIBILITY (h->other)
3867 && h->root.type == bfd_link_hash_undefweak))
3869 /* This is actually a static link, or it is a -Bsymbolic
3870 link and the symbol is defined locally, or the symbol
3871 was forced to be local because of a version file. We
3872 must initialize this entry in the global offset table.
3873 Since the offset must always be a multiple of 8, we
3874 use the least significant bit to record whether we
3875 have initialized it already.
3877 When doing a dynamic link, we create a .rela.got
3878 relocation entry to initialize the value. This is
3879 done in the finish_dynamic_symbol routine. */
3884 bfd_put_64 (output_bfd, relocation,
3885 base_got->contents + off);
3886 /* Note that this is harmless for the GOTPLT64 case,
3887 as -1 | 1 still is -1. */
3892 unresolved_reloc = FALSE;
3896 if (local_got_offsets == NULL)
3899 off = local_got_offsets[r_symndx];
3901 /* The offset must always be a multiple of 8. We use
3902 the least significant bit to record whether we have
3903 already generated the necessary reloc. */
3908 bfd_put_64 (output_bfd, relocation,
3909 base_got->contents + off);
3914 Elf_Internal_Rela outrel;
3916 /* We need to generate a R_X86_64_RELATIVE reloc
3917 for the dynamic linker. */
3918 s = htab->elf.srelgot;
3922 outrel.r_offset = (base_got->output_section->vma
3923 + base_got->output_offset
3925 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3926 outrel.r_addend = relocation;
3927 elf_append_rela (output_bfd, s, &outrel);
3930 local_got_offsets[r_symndx] |= 1;
3934 if (off >= (bfd_vma) -2)
3937 relocation = base_got->output_section->vma
3938 + base_got->output_offset + off;
3939 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3940 relocation -= htab->elf.sgotplt->output_section->vma
3941 - htab->elf.sgotplt->output_offset;
3945 case R_X86_64_GOTOFF64:
3946 /* Relocation is relative to the start of the global offset
3949 /* Check to make sure it isn't a protected function symbol
3950 for shared library since it may not be local when used
3951 as function address. */
3952 if (!info->executable
3954 && !SYMBOLIC_BIND (info, h)
3956 && h->type == STT_FUNC
3957 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3959 (*_bfd_error_handler)
3960 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3961 input_bfd, h->root.root.string);
3962 bfd_set_error (bfd_error_bad_value);
3966 /* Note that sgot is not involved in this
3967 calculation. We always want the start of .got.plt. If we
3968 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3969 permitted by the ABI, we might have to change this
3971 relocation -= htab->elf.sgotplt->output_section->vma
3972 + htab->elf.sgotplt->output_offset;
3975 case R_X86_64_GOTPC32:
3976 case R_X86_64_GOTPC64:
3977 /* Use global offset table as symbol value. */
3978 relocation = htab->elf.sgotplt->output_section->vma
3979 + htab->elf.sgotplt->output_offset;
3980 unresolved_reloc = FALSE;
3983 case R_X86_64_PLTOFF64:
3984 /* Relocation is PLT entry relative to GOT. For local
3985 symbols it's the symbol itself relative to GOT. */
3987 /* See PLT32 handling. */
3988 && h->plt.offset != (bfd_vma) -1
3989 && htab->elf.splt != NULL)
3991 if (htab->plt_bnd != NULL)
3993 resolved_plt = htab->plt_bnd;
3994 plt_offset = eh->plt_bnd.offset;
3998 resolved_plt = htab->elf.splt;
3999 plt_offset = h->plt.offset;
4002 relocation = (resolved_plt->output_section->vma
4003 + resolved_plt->output_offset
4005 unresolved_reloc = FALSE;
4008 relocation -= htab->elf.sgotplt->output_section->vma
4009 + htab->elf.sgotplt->output_offset;
4012 case R_X86_64_PLT32:
4013 case R_X86_64_PLT32_BND:
4014 /* Relocation is to the entry for this symbol in the
4015 procedure linkage table. */
4017 /* Resolve a PLT32 reloc against a local symbol directly,
4018 without using the procedure linkage table. */
4022 if ((h->plt.offset == (bfd_vma) -1
4023 && eh->plt_got.offset == (bfd_vma) -1)
4024 || htab->elf.splt == NULL)
4026 /* We didn't make a PLT entry for this symbol. This
4027 happens when statically linking PIC code, or when
4028 using -Bsymbolic. */
4032 if (h->plt.offset != (bfd_vma) -1)
4034 if (htab->plt_bnd != NULL)
4036 resolved_plt = htab->plt_bnd;
4037 plt_offset = eh->plt_bnd.offset;
4041 resolved_plt = htab->elf.splt;
4042 plt_offset = h->plt.offset;
4047 /* Use the GOT PLT. */
4048 resolved_plt = htab->plt_got;
4049 plt_offset = eh->plt_got.offset;
4052 relocation = (resolved_plt->output_section->vma
4053 + resolved_plt->output_offset
4055 unresolved_reloc = FALSE;
4058 case R_X86_64_SIZE32:
4059 case R_X86_64_SIZE64:
4060 /* Set to symbol size. */
4061 relocation = st_size;
4067 case R_X86_64_PC32_BND:
4068 /* Don't complain about -fPIC if the symbol is undefined when
4069 building executable. */
4071 && (input_section->flags & SEC_ALLOC) != 0
4072 && (input_section->flags & SEC_READONLY) != 0
4074 && !(info->executable
4075 && h->root.type == bfd_link_hash_undefined))
4077 bfd_boolean fail = FALSE;
4079 = ((r_type == R_X86_64_PC32
4080 || r_type == R_X86_64_PC32_BND)
4081 && is_32bit_relative_branch (contents, rel->r_offset));
4083 if (SYMBOL_REFERENCES_LOCAL (info, h))
4085 /* Symbol is referenced locally. Make sure it is
4086 defined locally or for a branch. */
4087 fail = !h->def_regular && !branch;
4089 else if (!(info->executable
4090 && (h->needs_copy || eh->needs_copy)))
4092 /* Symbol doesn't need copy reloc and isn't referenced
4093 locally. We only allow branch to symbol with
4094 non-default visibility. */
4096 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4103 const char *pic = "";
4105 switch (ELF_ST_VISIBILITY (h->other))
4108 v = _("hidden symbol");
4111 v = _("internal symbol");
4114 v = _("protected symbol");
4118 pic = _("; recompile with -fPIC");
4123 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4125 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4127 (*_bfd_error_handler) (fmt, input_bfd,
4128 x86_64_elf_howto_table[r_type].name,
4129 v, h->root.root.string, pic);
4130 bfd_set_error (bfd_error_bad_value);
4141 /* FIXME: The ABI says the linker should make sure the value is
4142 the same when it's zeroextended to 64 bit. */
4145 if ((input_section->flags & SEC_ALLOC) == 0)
4148 /* Don't copy a pc-relative relocation into the output file
4149 if the symbol needs copy reloc or the symbol is undefined
4150 when building executable. */
4152 && !(info->executable
4156 || h->root.type == bfd_link_hash_undefined)
4157 && IS_X86_64_PCREL_TYPE (r_type))
4159 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4160 || h->root.type != bfd_link_hash_undefweak)
4161 && ((! IS_X86_64_PCREL_TYPE (r_type)
4162 && r_type != R_X86_64_SIZE32
4163 && r_type != R_X86_64_SIZE64)
4164 || ! SYMBOL_CALLS_LOCAL (info, h)))
4165 || (ELIMINATE_COPY_RELOCS
4172 || h->root.type == bfd_link_hash_undefweak
4173 || h->root.type == bfd_link_hash_undefined)))
4175 Elf_Internal_Rela outrel;
4176 bfd_boolean skip, relocate;
4179 /* When generating a shared object, these relocations
4180 are copied into the output file to be resolved at run
4186 _bfd_elf_section_offset (output_bfd, info, input_section,
4188 if (outrel.r_offset == (bfd_vma) -1)
4190 else if (outrel.r_offset == (bfd_vma) -2)
4191 skip = TRUE, relocate = TRUE;
4193 outrel.r_offset += (input_section->output_section->vma
4194 + input_section->output_offset);
4197 memset (&outrel, 0, sizeof outrel);
4199 /* h->dynindx may be -1 if this symbol was marked to
4203 && (IS_X86_64_PCREL_TYPE (r_type)
4205 || ! SYMBOLIC_BIND (info, h)
4206 || ! h->def_regular))
4208 outrel.r_info = htab->r_info (h->dynindx, r_type);
4209 outrel.r_addend = rel->r_addend;
4213 /* This symbol is local, or marked to become local. */
4214 if (r_type == htab->pointer_r_type)
4217 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4218 outrel.r_addend = relocation + rel->r_addend;
4220 else if (r_type == R_X86_64_64
4221 && !ABI_64_P (output_bfd))
4224 outrel.r_info = htab->r_info (0,
4225 R_X86_64_RELATIVE64);
4226 outrel.r_addend = relocation + rel->r_addend;
4227 /* Check addend overflow. */
4228 if ((outrel.r_addend & 0x80000000)
4229 != (rel->r_addend & 0x80000000))
4232 int addend = rel->r_addend;
4233 if (h && h->root.root.string)
4234 name = h->root.root.string;
4236 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4239 (*_bfd_error_handler)
4240 (_("%B: addend -0x%x in relocation %s against "
4241 "symbol `%s' at 0x%lx in section `%A' is "
4243 input_bfd, input_section, addend,
4244 x86_64_elf_howto_table[r_type].name,
4245 name, (unsigned long) rel->r_offset);
4247 (*_bfd_error_handler)
4248 (_("%B: addend 0x%x in relocation %s against "
4249 "symbol `%s' at 0x%lx in section `%A' is "
4251 input_bfd, input_section, addend,
4252 x86_64_elf_howto_table[r_type].name,
4253 name, (unsigned long) rel->r_offset);
4254 bfd_set_error (bfd_error_bad_value);
4262 if (bfd_is_abs_section (sec))
4264 else if (sec == NULL || sec->owner == NULL)
4266 bfd_set_error (bfd_error_bad_value);
4273 /* We are turning this relocation into one
4274 against a section symbol. It would be
4275 proper to subtract the symbol's value,
4276 osec->vma, from the emitted reloc addend,
4277 but ld.so expects buggy relocs. */
4278 osec = sec->output_section;
4279 sindx = elf_section_data (osec)->dynindx;
4282 asection *oi = htab->elf.text_index_section;
4283 sindx = elf_section_data (oi)->dynindx;
4285 BFD_ASSERT (sindx != 0);
4288 outrel.r_info = htab->r_info (sindx, r_type);
4289 outrel.r_addend = relocation + rel->r_addend;
4293 sreloc = elf_section_data (input_section)->sreloc;
4295 if (sreloc == NULL || sreloc->contents == NULL)
4297 r = bfd_reloc_notsupported;
4298 goto check_relocation_error;
4301 elf_append_rela (output_bfd, sreloc, &outrel);
4303 /* If this reloc is against an external symbol, we do
4304 not want to fiddle with the addend. Otherwise, we
4305 need to include the symbol value so that it becomes
4306 an addend for the dynamic reloc. */
4313 case R_X86_64_TLSGD:
4314 case R_X86_64_GOTPC32_TLSDESC:
4315 case R_X86_64_TLSDESC_CALL:
4316 case R_X86_64_GOTTPOFF:
4317 tls_type = GOT_UNKNOWN;
4318 if (h == NULL && local_got_offsets)
4319 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4321 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4323 if (! elf_x86_64_tls_transition (info, input_bfd,
4324 input_section, contents,
4325 symtab_hdr, sym_hashes,
4326 &r_type, tls_type, rel,
4327 relend, h, r_symndx))
4330 if (r_type == R_X86_64_TPOFF32)
4332 bfd_vma roff = rel->r_offset;
4334 BFD_ASSERT (! unresolved_reloc);
4336 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4338 /* GD->LE transition. For 64bit, change
4339 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4340 .word 0x6666; rex64; call __tls_get_addr
4343 leaq foo@tpoff(%rax), %rax
4345 leaq foo@tlsgd(%rip), %rdi
4346 .word 0x6666; rex64; call __tls_get_addr
4349 leaq foo@tpoff(%rax), %rax
4350 For largepic, change:
4351 leaq foo@tlsgd(%rip), %rdi
4352 movabsq $__tls_get_addr@pltoff, %rax
4357 leaq foo@tpoff(%rax), %rax
4358 nopw 0x0(%rax,%rax,1) */
4360 if (ABI_64_P (output_bfd)
4361 && contents[roff + 5] == (bfd_byte) '\xb8')
4363 memcpy (contents + roff - 3,
4364 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4365 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4368 else if (ABI_64_P (output_bfd))
4369 memcpy (contents + roff - 4,
4370 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4373 memcpy (contents + roff - 3,
4374 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4376 bfd_put_32 (output_bfd,
4377 elf_x86_64_tpoff (info, relocation),
4378 contents + roff + 8 + largepic);
4379 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4383 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4385 /* GDesc -> LE transition.
4386 It's originally something like:
4387 leaq x@tlsdesc(%rip), %rax
4390 movl $x@tpoff, %rax. */
4392 unsigned int val, type;
4394 type = bfd_get_8 (input_bfd, contents + roff - 3);
4395 val = bfd_get_8 (input_bfd, contents + roff - 1);
4396 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4397 contents + roff - 3);
4398 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4399 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4400 contents + roff - 1);
4401 bfd_put_32 (output_bfd,
4402 elf_x86_64_tpoff (info, relocation),
4406 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4408 /* GDesc -> LE transition.
4413 bfd_put_8 (output_bfd, 0x66, contents + roff);
4414 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4417 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4419 /* IE->LE transition:
4420 For 64bit, originally it can be one of:
4421 movq foo@gottpoff(%rip), %reg
4422 addq foo@gottpoff(%rip), %reg
4425 leaq foo(%reg), %reg
4427 For 32bit, originally it can be one of:
4428 movq foo@gottpoff(%rip), %reg
4429 addl foo@gottpoff(%rip), %reg
4432 leal foo(%reg), %reg
4435 unsigned int val, type, reg;
4438 val = bfd_get_8 (input_bfd, contents + roff - 3);
4441 type = bfd_get_8 (input_bfd, contents + roff - 2);
4442 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4448 bfd_put_8 (output_bfd, 0x49,
4449 contents + roff - 3);
4450 else if (!ABI_64_P (output_bfd) && val == 0x44)
4451 bfd_put_8 (output_bfd, 0x41,
4452 contents + roff - 3);
4453 bfd_put_8 (output_bfd, 0xc7,
4454 contents + roff - 2);
4455 bfd_put_8 (output_bfd, 0xc0 | reg,
4456 contents + roff - 1);
4460 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4463 bfd_put_8 (output_bfd, 0x49,
4464 contents + roff - 3);
4465 else if (!ABI_64_P (output_bfd) && val == 0x44)
4466 bfd_put_8 (output_bfd, 0x41,
4467 contents + roff - 3);
4468 bfd_put_8 (output_bfd, 0x81,
4469 contents + roff - 2);
4470 bfd_put_8 (output_bfd, 0xc0 | reg,
4471 contents + roff - 1);
4475 /* addq/addl -> leaq/leal */
4477 bfd_put_8 (output_bfd, 0x4d,
4478 contents + roff - 3);
4479 else if (!ABI_64_P (output_bfd) && val == 0x44)
4480 bfd_put_8 (output_bfd, 0x45,
4481 contents + roff - 3);
4482 bfd_put_8 (output_bfd, 0x8d,
4483 contents + roff - 2);
4484 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4485 contents + roff - 1);
4487 bfd_put_32 (output_bfd,
4488 elf_x86_64_tpoff (info, relocation),
4496 if (htab->elf.sgot == NULL)
4501 off = h->got.offset;
4502 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4506 if (local_got_offsets == NULL)
4509 off = local_got_offsets[r_symndx];
4510 offplt = local_tlsdesc_gotents[r_symndx];
4517 Elf_Internal_Rela outrel;
4521 if (htab->elf.srelgot == NULL)
4524 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4526 if (GOT_TLS_GDESC_P (tls_type))
4528 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4529 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4530 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4531 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4532 + htab->elf.sgotplt->output_offset
4534 + htab->sgotplt_jump_table_size);
4535 sreloc = htab->elf.srelplt;
4537 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4539 outrel.r_addend = 0;
4540 elf_append_rela (output_bfd, sreloc, &outrel);
4543 sreloc = htab->elf.srelgot;
4545 outrel.r_offset = (htab->elf.sgot->output_section->vma
4546 + htab->elf.sgot->output_offset + off);
4548 if (GOT_TLS_GD_P (tls_type))
4549 dr_type = R_X86_64_DTPMOD64;
4550 else if (GOT_TLS_GDESC_P (tls_type))
4553 dr_type = R_X86_64_TPOFF64;
4555 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4556 outrel.r_addend = 0;
4557 if ((dr_type == R_X86_64_TPOFF64
4558 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4559 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4560 outrel.r_info = htab->r_info (indx, dr_type);
4562 elf_append_rela (output_bfd, sreloc, &outrel);
4564 if (GOT_TLS_GD_P (tls_type))
4568 BFD_ASSERT (! unresolved_reloc);
4569 bfd_put_64 (output_bfd,
4570 relocation - elf_x86_64_dtpoff_base (info),
4571 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4575 bfd_put_64 (output_bfd, 0,
4576 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4577 outrel.r_info = htab->r_info (indx,
4579 outrel.r_offset += GOT_ENTRY_SIZE;
4580 elf_append_rela (output_bfd, sreloc,
4589 local_got_offsets[r_symndx] |= 1;
4592 if (off >= (bfd_vma) -2
4593 && ! GOT_TLS_GDESC_P (tls_type))
4595 if (r_type == ELF32_R_TYPE (rel->r_info))
4597 if (r_type == R_X86_64_GOTPC32_TLSDESC
4598 || r_type == R_X86_64_TLSDESC_CALL)
4599 relocation = htab->elf.sgotplt->output_section->vma
4600 + htab->elf.sgotplt->output_offset
4601 + offplt + htab->sgotplt_jump_table_size;
4603 relocation = htab->elf.sgot->output_section->vma
4604 + htab->elf.sgot->output_offset + off;
4605 unresolved_reloc = FALSE;
4609 bfd_vma roff = rel->r_offset;
4611 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4613 /* GD->IE transition. For 64bit, change
4614 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4615 .word 0x6666; rex64; call __tls_get_addr@plt
4618 addq foo@gottpoff(%rip), %rax
4620 leaq foo@tlsgd(%rip), %rdi
4621 .word 0x6666; rex64; call __tls_get_addr@plt
4624 addq foo@gottpoff(%rip), %rax
4625 For largepic, change:
4626 leaq foo@tlsgd(%rip), %rdi
4627 movabsq $__tls_get_addr@pltoff, %rax
4632 addq foo@gottpoff(%rax), %rax
4633 nopw 0x0(%rax,%rax,1) */
4635 if (ABI_64_P (output_bfd)
4636 && contents[roff + 5] == (bfd_byte) '\xb8')
4638 memcpy (contents + roff - 3,
4639 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4640 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4643 else if (ABI_64_P (output_bfd))
4644 memcpy (contents + roff - 4,
4645 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4648 memcpy (contents + roff - 3,
4649 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4652 relocation = (htab->elf.sgot->output_section->vma
4653 + htab->elf.sgot->output_offset + off
4656 - input_section->output_section->vma
4657 - input_section->output_offset
4659 bfd_put_32 (output_bfd, relocation,
4660 contents + roff + 8 + largepic);
4661 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4665 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4667 /* GDesc -> IE transition.
4668 It's originally something like:
4669 leaq x@tlsdesc(%rip), %rax
4672 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4674 /* Now modify the instruction as appropriate. To
4675 turn a leaq into a movq in the form we use it, it
4676 suffices to change the second byte from 0x8d to
4678 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4680 bfd_put_32 (output_bfd,
4681 htab->elf.sgot->output_section->vma
4682 + htab->elf.sgot->output_offset + off
4684 - input_section->output_section->vma
4685 - input_section->output_offset
4690 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4692 /* GDesc -> IE transition.
4699 bfd_put_8 (output_bfd, 0x66, contents + roff);
4700 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4708 case R_X86_64_TLSLD:
4709 if (! elf_x86_64_tls_transition (info, input_bfd,
4710 input_section, contents,
4711 symtab_hdr, sym_hashes,
4712 &r_type, GOT_UNKNOWN,
4713 rel, relend, h, r_symndx))
4716 if (r_type != R_X86_64_TLSLD)
4718 /* LD->LE transition:
4719 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4720 For 64bit, we change it into:
4721 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4722 For 32bit, we change it into:
4723 nopl 0x0(%rax); movl %fs:0, %eax.
4724 For largepic, change:
4725 leaq foo@tlsgd(%rip), %rdi
4726 movabsq $__tls_get_addr@pltoff, %rax
4730 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4733 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4734 if (ABI_64_P (output_bfd)
4735 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
4736 memcpy (contents + rel->r_offset - 3,
4737 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4738 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4739 else if (ABI_64_P (output_bfd))
4740 memcpy (contents + rel->r_offset - 3,
4741 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4743 memcpy (contents + rel->r_offset - 3,
4744 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4745 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4750 if (htab->elf.sgot == NULL)
4753 off = htab->tls_ld_got.offset;
4758 Elf_Internal_Rela outrel;
4760 if (htab->elf.srelgot == NULL)
4763 outrel.r_offset = (htab->elf.sgot->output_section->vma
4764 + htab->elf.sgot->output_offset + off);
4766 bfd_put_64 (output_bfd, 0,
4767 htab->elf.sgot->contents + off);
4768 bfd_put_64 (output_bfd, 0,
4769 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4770 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4771 outrel.r_addend = 0;
4772 elf_append_rela (output_bfd, htab->elf.srelgot,
4774 htab->tls_ld_got.offset |= 1;
4776 relocation = htab->elf.sgot->output_section->vma
4777 + htab->elf.sgot->output_offset + off;
4778 unresolved_reloc = FALSE;
4781 case R_X86_64_DTPOFF32:
4782 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4783 relocation -= elf_x86_64_dtpoff_base (info);
4785 relocation = elf_x86_64_tpoff (info, relocation);
4788 case R_X86_64_TPOFF32:
4789 case R_X86_64_TPOFF64:
4790 BFD_ASSERT (info->executable);
4791 relocation = elf_x86_64_tpoff (info, relocation);
4794 case R_X86_64_DTPOFF64:
4795 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4796 relocation -= elf_x86_64_dtpoff_base (info);
4803 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4804 because such sections are not SEC_ALLOC and thus ld.so will
4805 not process them. */
4806 if (unresolved_reloc
4807 && !((input_section->flags & SEC_DEBUGGING) != 0
4809 && _bfd_elf_section_offset (output_bfd, info, input_section,
4810 rel->r_offset) != (bfd_vma) -1)
4812 (*_bfd_error_handler)
4813 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4816 (long) rel->r_offset,
4818 h->root.root.string);
4823 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4824 contents, rel->r_offset,
4825 relocation, rel->r_addend);
4827 check_relocation_error:
4828 if (r != bfd_reloc_ok)
4833 name = h->root.root.string;
4836 name = bfd_elf_string_from_elf_section (input_bfd,
4837 symtab_hdr->sh_link,
4842 name = bfd_section_name (input_bfd, sec);
4845 if (r == bfd_reloc_overflow)
4847 if (! ((*info->callbacks->reloc_overflow)
4848 (info, (h ? &h->root : NULL), name, howto->name,
4849 (bfd_vma) 0, input_bfd, input_section,
4855 (*_bfd_error_handler)
4856 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4857 input_bfd, input_section,
4858 (long) rel->r_offset, name, (int) r);
4867 /* Finish up dynamic symbol handling. We set the contents of various
4868 dynamic sections here. */
4871 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4872 struct bfd_link_info *info,
4873 struct elf_link_hash_entry *h,
4874 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4876 struct elf_x86_64_link_hash_table *htab;
4877 const struct elf_x86_64_backend_data *abed;
4878 bfd_boolean use_plt_bnd;
4879 struct elf_x86_64_link_hash_entry *eh;
4881 htab = elf_x86_64_hash_table (info);
4885 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
4886 section only if there is .plt section. */
4887 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
4889 ? &elf_x86_64_bnd_arch_bed
4890 : get_elf_x86_64_backend_data (output_bfd));
4892 eh = (struct elf_x86_64_link_hash_entry *) h;
4894 if (h->plt.offset != (bfd_vma) -1)
4897 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
4898 bfd_vma plt_plt_insn_end, plt_got_insn_size;
4899 Elf_Internal_Rela rela;
4901 asection *plt, *gotplt, *relplt, *resolved_plt;
4902 const struct elf_backend_data *bed;
4903 bfd_vma plt_got_pcrel_offset;
4905 /* When building a static executable, use .iplt, .igot.plt and
4906 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4907 if (htab->elf.splt != NULL)
4909 plt = htab->elf.splt;
4910 gotplt = htab->elf.sgotplt;
4911 relplt = htab->elf.srelplt;
4915 plt = htab->elf.iplt;
4916 gotplt = htab->elf.igotplt;
4917 relplt = htab->elf.irelplt;
4920 /* This symbol has an entry in the procedure linkage table. Set
4922 if ((h->dynindx == -1
4923 && !((h->forced_local || info->executable)
4925 && h->type == STT_GNU_IFUNC))
4931 /* Get the index in the procedure linkage table which
4932 corresponds to this symbol. This is the index of this symbol
4933 in all the symbols for which we are making plt entries. The
4934 first entry in the procedure linkage table is reserved.
4936 Get the offset into the .got table of the entry that
4937 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4938 bytes. The first three are reserved for the dynamic linker.
4940 For static executables, we don't reserve anything. */
4942 if (plt == htab->elf.splt)
4944 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4945 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4949 got_offset = h->plt.offset / abed->plt_entry_size;
4950 got_offset = got_offset * GOT_ENTRY_SIZE;
4953 plt_plt_insn_end = abed->plt_plt_insn_end;
4954 plt_plt_offset = abed->plt_plt_offset;
4955 plt_got_insn_size = abed->plt_got_insn_size;
4956 plt_got_offset = abed->plt_got_offset;
4959 /* Use the second PLT with BND relocations. */
4960 const bfd_byte *plt_entry, *plt2_entry;
4962 if (eh->has_bnd_reloc)
4964 plt_entry = elf_x86_64_bnd_plt_entry;
4965 plt2_entry = elf_x86_64_bnd_plt2_entry;
4969 plt_entry = elf_x86_64_legacy_plt_entry;
4970 plt2_entry = elf_x86_64_legacy_plt2_entry;
4972 /* Subtract 1 since there is no BND prefix. */
4973 plt_plt_insn_end -= 1;
4974 plt_plt_offset -= 1;
4975 plt_got_insn_size -= 1;
4976 plt_got_offset -= 1;
4979 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
4980 == sizeof (elf_x86_64_legacy_plt_entry));
4982 /* Fill in the entry in the procedure linkage table. */
4983 memcpy (plt->contents + h->plt.offset,
4984 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
4985 /* Fill in the entry in the second PLT. */
4986 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
4987 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
4989 resolved_plt = htab->plt_bnd;
4990 plt_offset = eh->plt_bnd.offset;
4994 /* Fill in the entry in the procedure linkage table. */
4995 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4996 abed->plt_entry_size);
4999 plt_offset = h->plt.offset;
5002 /* Insert the relocation positions of the plt section. */
5004 /* Put offset the PC-relative instruction referring to the GOT entry,
5005 subtracting the size of that instruction. */
5006 plt_got_pcrel_offset = (gotplt->output_section->vma
5007 + gotplt->output_offset
5009 - resolved_plt->output_section->vma
5010 - resolved_plt->output_offset
5012 - plt_got_insn_size);
5014 /* Check PC-relative offset overflow in PLT entry. */
5015 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5016 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5017 output_bfd, h->root.root.string);
5019 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5020 resolved_plt->contents + plt_offset + plt_got_offset);
5022 /* Fill in the entry in the global offset table, initially this
5023 points to the second part of the PLT entry. */
5024 bfd_put_64 (output_bfd, (plt->output_section->vma
5025 + plt->output_offset
5026 + h->plt.offset + abed->plt_lazy_offset),
5027 gotplt->contents + got_offset);
5029 /* Fill in the entry in the .rela.plt section. */
5030 rela.r_offset = (gotplt->output_section->vma
5031 + gotplt->output_offset
5033 if (h->dynindx == -1
5034 || ((info->executable
5035 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5037 && h->type == STT_GNU_IFUNC))
5039 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5040 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5041 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5042 rela.r_addend = (h->root.u.def.value
5043 + h->root.u.def.section->output_section->vma
5044 + h->root.u.def.section->output_offset);
5045 /* R_X86_64_IRELATIVE comes last. */
5046 plt_index = htab->next_irelative_index--;
5050 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5052 plt_index = htab->next_jump_slot_index++;
5055 /* Don't fill PLT entry for static executables. */
5056 if (plt == htab->elf.splt)
5058 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5060 /* Put relocation index. */
5061 bfd_put_32 (output_bfd, plt_index,
5062 plt->contents + h->plt.offset + abed->plt_reloc_offset);
5064 /* Put offset for jmp .PLT0 and check for overflow. We don't
5065 check relocation index for overflow since branch displacement
5066 will overflow first. */
5067 if (plt0_offset > 0x80000000)
5068 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5069 output_bfd, h->root.root.string);
5070 bfd_put_32 (output_bfd, - plt0_offset,
5071 plt->contents + h->plt.offset + plt_plt_offset);
5074 bed = get_elf_backend_data (output_bfd);
5075 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5076 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5078 else if (eh->plt_got.offset != (bfd_vma) -1)
5080 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
5081 asection *plt, *got;
5082 bfd_boolean got_after_plt;
5083 int32_t got_pcrel_offset;
5084 const bfd_byte *got_plt_entry;
5086 /* Set the entry in the GOT procedure linkage table. */
5087 plt = htab->plt_got;
5088 got = htab->elf.sgot;
5089 got_offset = h->got.offset;
5091 if (got_offset == (bfd_vma) -1
5092 || h->type == STT_GNU_IFUNC
5097 /* Use the second PLT entry template for the GOT PLT since they
5098 are the identical. */
5099 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
5100 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
5101 if (eh->has_bnd_reloc)
5102 got_plt_entry = elf_x86_64_bnd_plt2_entry;
5105 got_plt_entry = elf_x86_64_legacy_plt2_entry;
5107 /* Subtract 1 since there is no BND prefix. */
5108 plt_got_insn_size -= 1;
5109 plt_got_offset -= 1;
5112 /* Fill in the entry in the GOT procedure linkage table. */
5113 plt_offset = eh->plt_got.offset;
5114 memcpy (plt->contents + plt_offset,
5115 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5117 /* Put offset the PC-relative instruction referring to the GOT
5118 entry, subtracting the size of that instruction. */
5119 got_pcrel_offset = (got->output_section->vma
5120 + got->output_offset
5122 - plt->output_section->vma
5123 - plt->output_offset
5125 - plt_got_insn_size);
5127 /* Check PC-relative offset overflow in GOT PLT entry. */
5128 got_after_plt = got->output_section->vma > plt->output_section->vma;
5129 if ((got_after_plt && got_pcrel_offset < 0)
5130 || (!got_after_plt && got_pcrel_offset > 0))
5131 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5132 output_bfd, h->root.root.string);
5134 bfd_put_32 (output_bfd, got_pcrel_offset,
5135 plt->contents + plt_offset + plt_got_offset);
5139 && (h->plt.offset != (bfd_vma) -1
5140 || eh->plt_got.offset != (bfd_vma) -1))
5142 /* Mark the symbol as undefined, rather than as defined in
5143 the .plt section. Leave the value if there were any
5144 relocations where pointer equality matters (this is a clue
5145 for the dynamic linker, to make function pointer
5146 comparisons work between an application and shared
5147 library), otherwise set it to zero. If a function is only
5148 called from a binary, there is no need to slow down
5149 shared libraries because of that. */
5150 sym->st_shndx = SHN_UNDEF;
5151 if (!h->pointer_equality_needed)
5155 if (h->got.offset != (bfd_vma) -1
5156 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
5157 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
5159 Elf_Internal_Rela rela;
5161 /* This symbol has an entry in the global offset table. Set it
5163 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5166 rela.r_offset = (htab->elf.sgot->output_section->vma
5167 + htab->elf.sgot->output_offset
5168 + (h->got.offset &~ (bfd_vma) 1));
5170 /* If this is a static link, or it is a -Bsymbolic link and the
5171 symbol is defined locally or was forced to be local because
5172 of a version file, we just want to emit a RELATIVE reloc.
5173 The entry in the global offset table will already have been
5174 initialized in the relocate_section function. */
5176 && h->type == STT_GNU_IFUNC)
5180 /* Generate R_X86_64_GLOB_DAT. */
5187 if (!h->pointer_equality_needed)
5190 /* For non-shared object, we can't use .got.plt, which
5191 contains the real function addres if we need pointer
5192 equality. We load the GOT entry with the PLT entry. */
5193 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5194 bfd_put_64 (output_bfd, (plt->output_section->vma
5195 + plt->output_offset
5197 htab->elf.sgot->contents + h->got.offset);
5201 else if (info->shared
5202 && SYMBOL_REFERENCES_LOCAL (info, h))
5204 if (!h->def_regular)
5206 BFD_ASSERT((h->got.offset & 1) != 0);
5207 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5208 rela.r_addend = (h->root.u.def.value
5209 + h->root.u.def.section->output_section->vma
5210 + h->root.u.def.section->output_offset);
5214 BFD_ASSERT((h->got.offset & 1) == 0);
5216 bfd_put_64 (output_bfd, (bfd_vma) 0,
5217 htab->elf.sgot->contents + h->got.offset);
5218 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5222 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5227 Elf_Internal_Rela rela;
5229 /* This symbol needs a copy reloc. Set it up. */
5231 if (h->dynindx == -1
5232 || (h->root.type != bfd_link_hash_defined
5233 && h->root.type != bfd_link_hash_defweak)
5234 || htab->srelbss == NULL)
5237 rela.r_offset = (h->root.u.def.value
5238 + h->root.u.def.section->output_section->vma
5239 + h->root.u.def.section->output_offset);
5240 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5242 elf_append_rela (output_bfd, htab->srelbss, &rela);
5248 /* Finish up local dynamic symbol handling. We set the contents of
5249 various dynamic sections here. */
5252 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5254 struct elf_link_hash_entry *h
5255 = (struct elf_link_hash_entry *) *slot;
5256 struct bfd_link_info *info
5257 = (struct bfd_link_info *) inf;
5259 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5263 /* Used to decide how to sort relocs in an optimal manner for the
5264 dynamic linker, before writing them out. */
5266 static enum elf_reloc_type_class
5267 elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
5268 const asection *rel_sec ATTRIBUTE_UNUSED,
5269 const Elf_Internal_Rela *rela)
5271 switch ((int) ELF32_R_TYPE (rela->r_info))
5273 case R_X86_64_RELATIVE:
5274 case R_X86_64_RELATIVE64:
5275 return reloc_class_relative;
5276 case R_X86_64_JUMP_SLOT:
5277 return reloc_class_plt;
5279 return reloc_class_copy;
5281 return reloc_class_normal;
5285 /* Finish up the dynamic sections. */
5288 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5289 struct bfd_link_info *info)
5291 struct elf_x86_64_link_hash_table *htab;
5294 const struct elf_x86_64_backend_data *abed;
5296 htab = elf_x86_64_hash_table (info);
5300 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5301 section only if there is .plt section. */
5302 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5303 ? &elf_x86_64_bnd_arch_bed
5304 : get_elf_x86_64_backend_data (output_bfd));
5306 dynobj = htab->elf.dynobj;
5307 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5309 if (htab->elf.dynamic_sections_created)
5311 bfd_byte *dyncon, *dynconend;
5312 const struct elf_backend_data *bed;
5313 bfd_size_type sizeof_dyn;
5315 if (sdyn == NULL || htab->elf.sgot == NULL)
5318 bed = get_elf_backend_data (dynobj);
5319 sizeof_dyn = bed->s->sizeof_dyn;
5320 dyncon = sdyn->contents;
5321 dynconend = sdyn->contents + sdyn->size;
5322 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5324 Elf_Internal_Dyn dyn;
5327 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5335 s = htab->elf.sgotplt;
5336 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5340 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5344 s = htab->elf.srelplt->output_section;
5345 dyn.d_un.d_val = s->size;
5349 /* The procedure linkage table relocs (DT_JMPREL) should
5350 not be included in the overall relocs (DT_RELA).
5351 Therefore, we override the DT_RELASZ entry here to
5352 make it not include the JMPREL relocs. Since the
5353 linker script arranges for .rela.plt to follow all
5354 other relocation sections, we don't have to worry
5355 about changing the DT_RELA entry. */
5356 if (htab->elf.srelplt != NULL)
5358 s = htab->elf.srelplt->output_section;
5359 dyn.d_un.d_val -= s->size;
5363 case DT_TLSDESC_PLT:
5365 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5366 + htab->tlsdesc_plt;
5369 case DT_TLSDESC_GOT:
5371 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5372 + htab->tlsdesc_got;
5376 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5379 /* Fill in the special first entry in the procedure linkage table. */
5380 if (htab->elf.splt && htab->elf.splt->size > 0)
5382 /* Fill in the first entry in the procedure linkage table. */
5383 memcpy (htab->elf.splt->contents,
5384 abed->plt0_entry, abed->plt_entry_size);
5385 /* Add offset for pushq GOT+8(%rip), since the instruction
5386 uses 6 bytes subtract this value. */
5387 bfd_put_32 (output_bfd,
5388 (htab->elf.sgotplt->output_section->vma
5389 + htab->elf.sgotplt->output_offset
5391 - htab->elf.splt->output_section->vma
5392 - htab->elf.splt->output_offset
5394 htab->elf.splt->contents + abed->plt0_got1_offset);
5395 /* Add offset for the PC-relative instruction accessing GOT+16,
5396 subtracting the offset to the end of that instruction. */
5397 bfd_put_32 (output_bfd,
5398 (htab->elf.sgotplt->output_section->vma
5399 + htab->elf.sgotplt->output_offset
5401 - htab->elf.splt->output_section->vma
5402 - htab->elf.splt->output_offset
5403 - abed->plt0_got2_insn_end),
5404 htab->elf.splt->contents + abed->plt0_got2_offset);
5406 elf_section_data (htab->elf.splt->output_section)
5407 ->this_hdr.sh_entsize = abed->plt_entry_size;
5409 if (htab->tlsdesc_plt)
5411 bfd_put_64 (output_bfd, (bfd_vma) 0,
5412 htab->elf.sgot->contents + htab->tlsdesc_got);
5414 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5415 abed->plt0_entry, abed->plt_entry_size);
5417 /* Add offset for pushq GOT+8(%rip), since the
5418 instruction uses 6 bytes subtract this value. */
5419 bfd_put_32 (output_bfd,
5420 (htab->elf.sgotplt->output_section->vma
5421 + htab->elf.sgotplt->output_offset
5423 - htab->elf.splt->output_section->vma
5424 - htab->elf.splt->output_offset
5427 htab->elf.splt->contents
5428 + htab->tlsdesc_plt + abed->plt0_got1_offset);
5429 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5430 where TGD stands for htab->tlsdesc_got, subtracting the offset
5431 to the end of that instruction. */
5432 bfd_put_32 (output_bfd,
5433 (htab->elf.sgot->output_section->vma
5434 + htab->elf.sgot->output_offset
5436 - htab->elf.splt->output_section->vma
5437 - htab->elf.splt->output_offset
5439 - abed->plt0_got2_insn_end),
5440 htab->elf.splt->contents
5441 + htab->tlsdesc_plt + abed->plt0_got2_offset);
5446 if (htab->plt_bnd != NULL)
5447 elf_section_data (htab->plt_bnd->output_section)
5448 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
5450 if (htab->elf.sgotplt)
5452 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5454 (*_bfd_error_handler)
5455 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5459 /* Fill in the first three entries in the global offset table. */
5460 if (htab->elf.sgotplt->size > 0)
5462 /* Set the first entry in the global offset table to the address of
5463 the dynamic section. */
5465 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5467 bfd_put_64 (output_bfd,
5468 sdyn->output_section->vma + sdyn->output_offset,
5469 htab->elf.sgotplt->contents);
5470 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5471 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5472 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5475 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
5479 /* Adjust .eh_frame for .plt section. */
5480 if (htab->plt_eh_frame != NULL
5481 && htab->plt_eh_frame->contents != NULL)
5483 if (htab->elf.splt != NULL
5484 && htab->elf.splt->size != 0
5485 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5486 && htab->elf.splt->output_section != NULL
5487 && htab->plt_eh_frame->output_section != NULL)
5489 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5490 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5491 + htab->plt_eh_frame->output_offset
5492 + PLT_FDE_START_OFFSET;
5493 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5494 htab->plt_eh_frame->contents
5495 + PLT_FDE_START_OFFSET);
5497 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5499 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5501 htab->plt_eh_frame->contents))
5506 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5507 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5510 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5511 htab_traverse (htab->loc_hash_table,
5512 elf_x86_64_finish_local_dynamic_symbol,
5518 /* Return an array of PLT entry symbol values. */
5521 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5524 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5527 bfd_vma *plt_sym_val;
5529 bfd_byte *plt_contents;
5530 const struct elf_x86_64_backend_data *bed;
5531 Elf_Internal_Shdr *hdr;
5534 /* Get the .plt section contents. PLT passed down may point to the
5535 .plt.bnd section. Make sure that PLT always points to the .plt
5537 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
5542 plt = bfd_get_section_by_name (abfd, ".plt");
5545 bed = &elf_x86_64_bnd_arch_bed;
5548 bed = get_elf_x86_64_backend_data (abfd);
5550 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5551 if (plt_contents == NULL)
5553 if (!bfd_get_section_contents (abfd, (asection *) plt,
5554 plt_contents, 0, plt->size))
5557 free (plt_contents);
5561 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5562 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5565 hdr = &elf_section_data (relplt)->this_hdr;
5566 count = relplt->size / hdr->sh_entsize;
5568 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5569 if (plt_sym_val == NULL)
5572 for (i = 0; i < count; i++)
5573 plt_sym_val[i] = -1;
5575 plt_offset = bed->plt_entry_size;
5576 p = relplt->relocation;
5577 for (i = 0; i < count; i++, p++)
5581 /* Skip unknown relocation. */
5582 if (p->howto == NULL)
5585 if (p->howto->type != R_X86_64_JUMP_SLOT
5586 && p->howto->type != R_X86_64_IRELATIVE)
5589 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5590 + bed->plt_reloc_offset));
5591 if (reloc_index >= count)
5595 /* This is the index in .plt section. */
5596 long plt_index = plt_offset / bed->plt_entry_size;
5597 /* Store VMA + the offset in .plt.bnd section. */
5598 plt_sym_val[reloc_index] =
5600 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
5603 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5604 plt_offset += bed->plt_entry_size;
5607 free (plt_contents);
5612 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5616 elf_x86_64_get_synthetic_symtab (bfd *abfd,
5623 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5624 as PLT if it exists. */
5625 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
5627 plt = bfd_get_section_by_name (abfd, ".plt");
5628 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5629 dynsymcount, dynsyms, ret,
5631 elf_x86_64_get_plt_sym_val);
5634 /* Handle an x86-64 specific section when reading an object file. This
5635 is called when elfcode.h finds a section with an unknown type. */
5638 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5639 const char *name, int shindex)
5641 if (hdr->sh_type != SHT_X86_64_UNWIND)
5644 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5650 /* Hook called by the linker routine which adds symbols from an object
5651 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5655 elf_x86_64_add_symbol_hook (bfd *abfd,
5656 struct bfd_link_info *info,
5657 Elf_Internal_Sym *sym,
5658 const char **namep ATTRIBUTE_UNUSED,
5659 flagword *flagsp ATTRIBUTE_UNUSED,
5665 switch (sym->st_shndx)
5667 case SHN_X86_64_LCOMMON:
5668 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
5671 lcomm = bfd_make_section_with_flags (abfd,
5675 | SEC_LINKER_CREATED));
5678 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
5681 *valp = sym->st_size;
5685 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5686 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5687 && (abfd->flags & DYNAMIC) == 0
5688 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5689 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5695 /* Given a BFD section, try to locate the corresponding ELF section
5699 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
5700 asection *sec, int *index_return)
5702 if (sec == &_bfd_elf_large_com_section)
5704 *index_return = SHN_X86_64_LCOMMON;
5710 /* Process a symbol. */
5713 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5716 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5718 switch (elfsym->internal_elf_sym.st_shndx)
5720 case SHN_X86_64_LCOMMON:
5721 asym->section = &_bfd_elf_large_com_section;
5722 asym->value = elfsym->internal_elf_sym.st_size;
5723 /* Common symbol doesn't set BSF_GLOBAL. */
5724 asym->flags &= ~BSF_GLOBAL;
5730 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5732 return (sym->st_shndx == SHN_COMMON
5733 || sym->st_shndx == SHN_X86_64_LCOMMON);
5737 elf_x86_64_common_section_index (asection *sec)
5739 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5742 return SHN_X86_64_LCOMMON;
5746 elf_x86_64_common_section (asection *sec)
5748 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5749 return bfd_com_section_ptr;
5751 return &_bfd_elf_large_com_section;
5755 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
5756 const Elf_Internal_Sym *sym,
5761 const asection *oldsec)
5763 /* A normal common symbol and a large common symbol result in a
5764 normal common symbol. We turn the large common symbol into a
5767 && h->root.type == bfd_link_hash_common
5769 && bfd_is_com_section (*psec)
5772 if (sym->st_shndx == SHN_COMMON
5773 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
5775 h->root.u.c.p->section
5776 = bfd_make_section_old_way (oldbfd, "COMMON");
5777 h->root.u.c.p->section->flags = SEC_ALLOC;
5779 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5780 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
5781 *psec = bfd_com_section_ptr;
5788 elf_x86_64_additional_program_headers (bfd *abfd,
5789 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5794 /* Check to see if we need a large readonly segment. */
5795 s = bfd_get_section_by_name (abfd, ".lrodata");
5796 if (s && (s->flags & SEC_LOAD))
5799 /* Check to see if we need a large data segment. Since .lbss sections
5800 is placed right after the .bss section, there should be no need for
5801 a large data segment just because of .lbss. */
5802 s = bfd_get_section_by_name (abfd, ".ldata");
5803 if (s && (s->flags & SEC_LOAD))
5809 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5812 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5814 if (h->plt.offset != (bfd_vma) -1
5816 && !h->pointer_equality_needed)
5819 return _bfd_elf_hash_symbol (h);
5822 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5825 elf_x86_64_relocs_compatible (const bfd_target *input,
5826 const bfd_target *output)
5828 return ((xvec_get_elf_backend_data (input)->s->elfclass
5829 == xvec_get_elf_backend_data (output)->s->elfclass)
5830 && _bfd_elf_relocs_compatible (input, output));
5833 static const struct bfd_elf_special_section
5834 elf_x86_64_special_sections[]=
5836 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5837 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5838 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5839 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5840 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5841 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5842 { NULL, 0, 0, 0, 0 }
5845 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5846 #define TARGET_LITTLE_NAME "elf64-x86-64"
5847 #define ELF_ARCH bfd_arch_i386
5848 #define ELF_TARGET_ID X86_64_ELF_DATA
5849 #define ELF_MACHINE_CODE EM_X86_64
5850 #define ELF_MAXPAGESIZE 0x200000
5851 #define ELF_MINPAGESIZE 0x1000
5852 #define ELF_COMMONPAGESIZE 0x1000
5854 #define elf_backend_can_gc_sections 1
5855 #define elf_backend_can_refcount 1
5856 #define elf_backend_want_got_plt 1
5857 #define elf_backend_plt_readonly 1
5858 #define elf_backend_want_plt_sym 0
5859 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5860 #define elf_backend_rela_normal 1
5861 #define elf_backend_plt_alignment 4
5863 #define elf_info_to_howto elf_x86_64_info_to_howto
5865 #define bfd_elf64_bfd_link_hash_table_create \
5866 elf_x86_64_link_hash_table_create
5867 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5868 #define bfd_elf64_bfd_reloc_name_lookup \
5869 elf_x86_64_reloc_name_lookup
5871 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5872 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5873 #define elf_backend_check_relocs elf_x86_64_check_relocs
5874 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5875 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5876 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5877 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5878 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5879 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5880 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5881 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5883 #define elf_backend_write_core_note elf_x86_64_write_core_note
5885 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5886 #define elf_backend_relocate_section elf_x86_64_relocate_section
5887 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5888 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5889 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5890 #define elf_backend_object_p elf64_x86_64_elf_object_p
5891 #define bfd_elf64_mkobject elf_x86_64_mkobject
5892 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5894 #define elf_backend_section_from_shdr \
5895 elf_x86_64_section_from_shdr
5897 #define elf_backend_section_from_bfd_section \
5898 elf_x86_64_elf_section_from_bfd_section
5899 #define elf_backend_add_symbol_hook \
5900 elf_x86_64_add_symbol_hook
5901 #define elf_backend_symbol_processing \
5902 elf_x86_64_symbol_processing
5903 #define elf_backend_common_section_index \
5904 elf_x86_64_common_section_index
5905 #define elf_backend_common_section \
5906 elf_x86_64_common_section
5907 #define elf_backend_common_definition \
5908 elf_x86_64_common_definition
5909 #define elf_backend_merge_symbol \
5910 elf_x86_64_merge_symbol
5911 #define elf_backend_special_sections \
5912 elf_x86_64_special_sections
5913 #define elf_backend_additional_program_headers \
5914 elf_x86_64_additional_program_headers
5915 #define elf_backend_hash_symbol \
5916 elf_x86_64_hash_symbol
5918 #include "elf64-target.h"
5920 /* FreeBSD support. */
5922 #undef TARGET_LITTLE_SYM
5923 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5924 #undef TARGET_LITTLE_NAME
5925 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5928 #define ELF_OSABI ELFOSABI_FREEBSD
5931 #define elf64_bed elf64_x86_64_fbsd_bed
5933 #include "elf64-target.h"
5935 /* Solaris 2 support. */
5937 #undef TARGET_LITTLE_SYM
5938 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5939 #undef TARGET_LITTLE_NAME
5940 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5942 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5943 objects won't be recognized. */
5947 #define elf64_bed elf64_x86_64_sol2_bed
5949 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5951 #undef elf_backend_static_tls_alignment
5952 #define elf_backend_static_tls_alignment 16
5954 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5956 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5958 #undef elf_backend_want_plt_sym
5959 #define elf_backend_want_plt_sym 1
5961 #include "elf64-target.h"
5963 /* Native Client support. */
5966 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
5968 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
5969 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
5973 #undef TARGET_LITTLE_SYM
5974 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
5975 #undef TARGET_LITTLE_NAME
5976 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5978 #define elf64_bed elf64_x86_64_nacl_bed
5980 #undef ELF_MAXPAGESIZE
5981 #undef ELF_MINPAGESIZE
5982 #undef ELF_COMMONPAGESIZE
5983 #define ELF_MAXPAGESIZE 0x10000
5984 #define ELF_MINPAGESIZE 0x10000
5985 #define ELF_COMMONPAGESIZE 0x10000
5987 /* Restore defaults. */
5989 #undef elf_backend_static_tls_alignment
5990 #undef elf_backend_want_plt_sym
5991 #define elf_backend_want_plt_sym 0
5993 /* NaCl uses substantially different PLT entries for the same effects. */
5995 #undef elf_backend_plt_alignment
5996 #define elf_backend_plt_alignment 5
5997 #define NACL_PLT_ENTRY_SIZE 64
5998 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6000 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6002 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6003 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6004 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6005 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6006 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6008 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6009 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6011 /* 32 bytes of nop to pad out to the standard size. */
6012 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6013 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6014 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6015 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6016 0x66, /* excess data32 prefix */
6020 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6022 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6023 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6024 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6025 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6027 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6028 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6029 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6031 /* Lazy GOT entries point here (32-byte aligned). */
6032 0x68, /* pushq immediate */
6033 0, 0, 0, 0, /* replaced with index into relocation table. */
6034 0xe9, /* jmp relative */
6035 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6037 /* 22 bytes of nop to pad out to the standard size. */
6038 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6039 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6040 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6043 /* .eh_frame covering the .plt section. */
6045 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6047 #if (PLT_CIE_LENGTH != 20 \
6048 || PLT_FDE_LENGTH != 36 \
6049 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6050 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6051 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6053 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6054 0, 0, 0, 0, /* CIE ID */
6055 1, /* CIE version */
6056 'z', 'R', 0, /* Augmentation string */
6057 1, /* Code alignment factor */
6058 0x78, /* Data alignment factor */
6059 16, /* Return address column */
6060 1, /* Augmentation size */
6061 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6062 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6063 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6064 DW_CFA_nop, DW_CFA_nop,
6066 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6067 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6068 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6069 0, 0, 0, 0, /* .plt size goes here */
6070 0, /* Augmentation size */
6071 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6072 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6073 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6074 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6075 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6076 13, /* Block length */
6077 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6078 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6079 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6080 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6081 DW_CFA_nop, DW_CFA_nop
6084 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6086 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6087 elf_x86_64_nacl_plt_entry, /* plt_entry */
6088 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6089 2, /* plt0_got1_offset */
6090 9, /* plt0_got2_offset */
6091 13, /* plt0_got2_insn_end */
6092 3, /* plt_got_offset */
6093 33, /* plt_reloc_offset */
6094 38, /* plt_plt_offset */
6095 7, /* plt_got_insn_size */
6096 42, /* plt_plt_insn_end */
6097 32, /* plt_lazy_offset */
6098 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6099 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6102 #undef elf_backend_arch_data
6103 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6105 #undef elf_backend_object_p
6106 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6107 #undef elf_backend_modify_segment_map
6108 #define elf_backend_modify_segment_map nacl_modify_segment_map
6109 #undef elf_backend_modify_program_headers
6110 #define elf_backend_modify_program_headers nacl_modify_program_headers
6111 #undef elf_backend_final_write_processing
6112 #define elf_backend_final_write_processing nacl_final_write_processing
6114 #include "elf64-target.h"
6116 /* Native Client x32 support. */
6119 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6121 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6122 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6126 #undef TARGET_LITTLE_SYM
6127 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6128 #undef TARGET_LITTLE_NAME
6129 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6131 #define elf32_bed elf32_x86_64_nacl_bed
6133 #define bfd_elf32_bfd_link_hash_table_create \
6134 elf_x86_64_link_hash_table_create
6135 #define bfd_elf32_bfd_reloc_type_lookup \
6136 elf_x86_64_reloc_type_lookup
6137 #define bfd_elf32_bfd_reloc_name_lookup \
6138 elf_x86_64_reloc_name_lookup
6139 #define bfd_elf32_mkobject \
6141 #define bfd_elf32_get_synthetic_symtab \
6142 elf_x86_64_get_synthetic_symtab
6144 #undef elf_backend_object_p
6145 #define elf_backend_object_p \
6146 elf32_x86_64_nacl_elf_object_p
6148 #undef elf_backend_bfd_from_remote_memory
6149 #define elf_backend_bfd_from_remote_memory \
6150 _bfd_elf32_bfd_from_remote_memory
6152 #undef elf_backend_size_info
6153 #define elf_backend_size_info \
6154 _bfd_elf32_size_info
6156 #include "elf32-target.h"
6158 /* Restore defaults. */
6159 #undef elf_backend_object_p
6160 #define elf_backend_object_p elf64_x86_64_elf_object_p
6161 #undef elf_backend_bfd_from_remote_memory
6162 #undef elf_backend_size_info
6163 #undef elf_backend_modify_segment_map
6164 #undef elf_backend_modify_program_headers
6165 #undef elf_backend_final_write_processing
6167 /* Intel L1OM support. */
6170 elf64_l1om_elf_object_p (bfd *abfd)
6172 /* Set the right machine number for an L1OM elf64 file. */
6173 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6177 #undef TARGET_LITTLE_SYM
6178 #define TARGET_LITTLE_SYM l1om_elf64_vec
6179 #undef TARGET_LITTLE_NAME
6180 #define TARGET_LITTLE_NAME "elf64-l1om"
6182 #define ELF_ARCH bfd_arch_l1om
6184 #undef ELF_MACHINE_CODE
6185 #define ELF_MACHINE_CODE EM_L1OM
6190 #define elf64_bed elf64_l1om_bed
6192 #undef elf_backend_object_p
6193 #define elf_backend_object_p elf64_l1om_elf_object_p
6195 /* Restore defaults. */
6196 #undef ELF_MAXPAGESIZE
6197 #undef ELF_MINPAGESIZE
6198 #undef ELF_COMMONPAGESIZE
6199 #define ELF_MAXPAGESIZE 0x200000
6200 #define ELF_MINPAGESIZE 0x1000
6201 #define ELF_COMMONPAGESIZE 0x1000
6202 #undef elf_backend_plt_alignment
6203 #define elf_backend_plt_alignment 4
6204 #undef elf_backend_arch_data
6205 #define elf_backend_arch_data &elf_x86_64_arch_bed
6207 #include "elf64-target.h"
6209 /* FreeBSD L1OM support. */
6211 #undef TARGET_LITTLE_SYM
6212 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6213 #undef TARGET_LITTLE_NAME
6214 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6217 #define ELF_OSABI ELFOSABI_FREEBSD
6220 #define elf64_bed elf64_l1om_fbsd_bed
6222 #include "elf64-target.h"
6224 /* Intel K1OM support. */
6227 elf64_k1om_elf_object_p (bfd *abfd)
6229 /* Set the right machine number for an K1OM elf64 file. */
6230 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6234 #undef TARGET_LITTLE_SYM
6235 #define TARGET_LITTLE_SYM k1om_elf64_vec
6236 #undef TARGET_LITTLE_NAME
6237 #define TARGET_LITTLE_NAME "elf64-k1om"
6239 #define ELF_ARCH bfd_arch_k1om
6241 #undef ELF_MACHINE_CODE
6242 #define ELF_MACHINE_CODE EM_K1OM
6247 #define elf64_bed elf64_k1om_bed
6249 #undef elf_backend_object_p
6250 #define elf_backend_object_p elf64_k1om_elf_object_p
6252 #undef elf_backend_static_tls_alignment
6254 #undef elf_backend_want_plt_sym
6255 #define elf_backend_want_plt_sym 0
6257 #include "elf64-target.h"
6259 /* FreeBSD K1OM support. */
6261 #undef TARGET_LITTLE_SYM
6262 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6263 #undef TARGET_LITTLE_NAME
6264 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6267 #define ELF_OSABI ELFOSABI_FREEBSD
6270 #define elf64_bed elf64_k1om_fbsd_bed
6272 #include "elf64-target.h"
6274 /* 32bit x86-64 support. */
6276 #undef TARGET_LITTLE_SYM
6277 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6278 #undef TARGET_LITTLE_NAME
6279 #define TARGET_LITTLE_NAME "elf32-x86-64"
6283 #define ELF_ARCH bfd_arch_i386
6285 #undef ELF_MACHINE_CODE
6286 #define ELF_MACHINE_CODE EM_X86_64
6290 #undef elf_backend_object_p
6291 #define elf_backend_object_p \
6292 elf32_x86_64_elf_object_p
6294 #undef elf_backend_bfd_from_remote_memory
6295 #define elf_backend_bfd_from_remote_memory \
6296 _bfd_elf32_bfd_from_remote_memory
6298 #undef elf_backend_size_info
6299 #define elf_backend_size_info \
6300 _bfd_elf32_size_info
6302 #include "elf32-target.h"