1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2014 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "elf/x86-64.h"
41 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
42 #define MINUS_ONE (~ (bfd_vma) 0)
44 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
45 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
46 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
47 since they are the same. */
49 #define ABI_64_P(abfd) \
50 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52 /* The relocation "howto" table. Order of fields:
53 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
54 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
55 static reloc_howto_type x86_64_elf_howto_table[] =
57 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
60 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
63 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
64 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
67 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
69 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
70 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
72 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
78 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
81 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
84 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
85 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
87 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
88 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
90 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
91 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
93 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
95 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
97 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
99 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
100 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
101 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
104 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
107 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
110 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
113 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
114 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
116 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
117 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
119 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
120 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
122 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
125 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
128 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
130 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
131 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
133 FALSE, 0xffffffff, 0xffffffff, TRUE),
134 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
135 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
137 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
138 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
140 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
141 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
142 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
143 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
144 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
146 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
147 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
149 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
150 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
152 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
153 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
155 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
156 complain_overflow_bitfield, bfd_elf_generic_reloc,
157 "R_X86_64_GOTPC32_TLSDESC",
158 FALSE, 0xffffffff, 0xffffffff, TRUE),
159 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
160 complain_overflow_dont, bfd_elf_generic_reloc,
161 "R_X86_64_TLSDESC_CALL",
163 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
164 complain_overflow_bitfield, bfd_elf_generic_reloc,
166 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
167 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
168 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
170 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
173 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
174 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
176 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
177 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
180 /* We have a gap in the reloc numbers here.
181 R_X86_64_standard counts the number up to this point, and
182 R_X86_64_vt_offset is the value to subtract from a reloc type of
183 R_X86_64_GNU_VT* to form an index into this table. */
184 #define R_X86_64_standard (R_X86_64_PLT32_BND + 1)
185 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
187 /* GNU extension to record C++ vtable hierarchy. */
188 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
189 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
191 /* GNU extension to record C++ vtable member usage. */
192 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
193 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
196 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
197 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
198 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
202 #define IS_X86_64_PCREL_TYPE(TYPE) \
203 ( ((TYPE) == R_X86_64_PC8) \
204 || ((TYPE) == R_X86_64_PC16) \
205 || ((TYPE) == R_X86_64_PC32) \
206 || ((TYPE) == R_X86_64_PC32_BND) \
207 || ((TYPE) == R_X86_64_PC64))
209 /* Map BFD relocs to the x86_64 elf relocs. */
212 bfd_reloc_code_real_type bfd_reloc_val;
213 unsigned char elf_reloc_val;
216 static const struct elf_reloc_map x86_64_reloc_map[] =
218 { BFD_RELOC_NONE, R_X86_64_NONE, },
219 { BFD_RELOC_64, R_X86_64_64, },
220 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
221 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
222 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
223 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
224 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
225 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
226 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
227 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
228 { BFD_RELOC_32, R_X86_64_32, },
229 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
230 { BFD_RELOC_16, R_X86_64_16, },
231 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
232 { BFD_RELOC_8, R_X86_64_8, },
233 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
234 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
235 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
236 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
237 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
238 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
239 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
240 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
241 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
242 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
243 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
244 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
245 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
246 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
247 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
248 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
249 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
250 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
251 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
252 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
253 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
254 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
255 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
256 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND,},
257 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND,},
258 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
259 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
262 static reloc_howto_type *
263 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
267 if (r_type == (unsigned int) R_X86_64_32)
272 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
274 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
275 || r_type >= (unsigned int) R_X86_64_max)
277 if (r_type >= (unsigned int) R_X86_64_standard)
279 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
281 r_type = R_X86_64_NONE;
286 i = r_type - (unsigned int) R_X86_64_vt_offset;
287 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
288 return &x86_64_elf_howto_table[i];
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type *
293 elf_x86_64_reloc_type_lookup (bfd *abfd,
294 bfd_reloc_code_real_type code)
298 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
301 if (x86_64_reloc_map[i].bfd_reloc_val == code)
302 return elf_x86_64_rtype_to_howto (abfd,
303 x86_64_reloc_map[i].elf_reloc_val);
308 static reloc_howto_type *
309 elf_x86_64_reloc_name_lookup (bfd *abfd,
314 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type *reloc
318 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
319 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
323 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
324 if (x86_64_elf_howto_table[i].name != NULL
325 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
326 return &x86_64_elf_howto_table[i];
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
334 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
335 Elf_Internal_Rela *dst)
339 r_type = ELF32_R_TYPE (dst->r_info);
340 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
341 BFD_ASSERT (r_type == cache_ptr->howto->type);
344 /* Support for core dump NOTE sections. */
346 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
351 switch (note->descsz)
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
358 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
361 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
371 elf_tdata (abfd)->core->signal
372 = bfd_get_16 (abfd, note->descdata + 12);
375 elf_tdata (abfd)->core->lwpid
376 = bfd_get_32 (abfd, note->descdata + 32);
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
387 size, note->descpos + offset);
391 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
393 switch (note->descsz)
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd)->core->pid
400 = bfd_get_32 (abfd, note->descdata + 12);
401 elf_tdata (abfd)->core->program
402 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
403 elf_tdata (abfd)->core->command
404 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 24);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
421 char *command = elf_tdata (abfd)->core->command;
422 int n = strlen (command);
424 if (0 < n && command[n - 1] == ' ')
425 command[n - 1] = '\0';
433 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
436 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
438 const char *fname, *psargs;
449 va_start (ap, note_type);
450 fname = va_arg (ap, const char *);
451 psargs = va_arg (ap, const char *);
454 if (bed->s->elfclass == ELFCLASS32)
457 memset (&data, 0, sizeof (data));
458 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
459 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
460 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
461 &data, sizeof (data));
466 memset (&data, 0, sizeof (data));
467 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
468 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
469 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
470 &data, sizeof (data));
475 va_start (ap, note_type);
476 pid = va_arg (ap, long);
477 cursig = va_arg (ap, int);
478 gregs = va_arg (ap, const void *);
481 if (bed->s->elfclass == ELFCLASS32)
483 if (bed->elf_machine_code == EM_X86_64)
485 prstatusx32_t prstat;
486 memset (&prstat, 0, sizeof (prstat));
488 prstat.pr_cursig = cursig;
489 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
490 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
491 &prstat, sizeof (prstat));
496 memset (&prstat, 0, sizeof (prstat));
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
507 memset (&prstat, 0, sizeof (prstat));
509 prstat.pr_cursig = cursig;
510 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
511 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
512 &prstat, sizeof (prstat));
519 /* Functions for the x86-64 ELF linker. */
521 /* The name of the dynamic interpreter. This is put in the .interp
524 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
525 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
527 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
528 copying dynamic variables from a shared lib into an app's dynbss
529 section, and instead use a dynamic relocation to point into the
531 #define ELIMINATE_COPY_RELOCS 1
533 /* The size in bytes of an entry in the global offset table. */
535 #define GOT_ENTRY_SIZE 8
537 /* The size in bytes of an entry in the procedure linkage table. */
539 #define PLT_ENTRY_SIZE 16
541 /* The first entry in a procedure linkage table looks like this. See the
542 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
544 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
546 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
547 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
548 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
551 /* Subsequent entries in a procedure linkage table look like this. */
553 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
555 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
556 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
557 0x68, /* pushq immediate */
558 0, 0, 0, 0, /* replaced with index into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
563 /* The first entry in a procedure linkage table with BND relocations
566 static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
568 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
569 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
570 0x0f, 0x1f, 0 /* nopl (%rax) */
573 /* Subsequent entries for legacy branches in a procedure linkage table
574 with BND relocations look like this. */
576 static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
578 0x68, 0, 0, 0, 0, /* pushq immediate */
579 0xe9, 0, 0, 0, 0, /* jmpq relative */
580 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
583 /* Subsequent entries for branches with BND prefx in a procedure linkage
584 table with BND relocations look like this. */
586 static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
590 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
593 /* Entries for legacy branches in the second procedure linkage table
596 static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
598 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
599 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* Entries for branches with BND prefix in the second procedure linkage
604 table look like this. */
606 static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
608 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
613 /* .eh_frame covering the .plt section. */
615 static const bfd_byte elf_x86_64_eh_frame_plt[] =
617 #define PLT_CIE_LENGTH 20
618 #define PLT_FDE_LENGTH 36
619 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
620 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
621 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
622 0, 0, 0, 0, /* CIE ID */
624 'z', 'R', 0, /* Augmentation string */
625 1, /* Code alignment factor */
626 0x78, /* Data alignment factor */
627 16, /* Return address column */
628 1, /* Augmentation size */
629 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
630 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
631 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
632 DW_CFA_nop, DW_CFA_nop,
634 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
635 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
636 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
637 0, 0, 0, 0, /* .plt size goes here */
638 0, /* Augmentation size */
639 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
640 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
641 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
642 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
643 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
644 11, /* Block length */
645 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
646 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
647 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
648 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
649 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
652 /* Architecture-specific backend data for x86-64. */
654 struct elf_x86_64_backend_data
656 /* Templates for the initial PLT entry and for subsequent entries. */
657 const bfd_byte *plt0_entry;
658 const bfd_byte *plt_entry;
659 unsigned int plt_entry_size; /* Size of each PLT entry. */
661 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
662 unsigned int plt0_got1_offset;
663 unsigned int plt0_got2_offset;
665 /* Offset of the end of the PC-relative instruction containing
667 unsigned int plt0_got2_insn_end;
669 /* Offsets into plt_entry that are to be replaced with... */
670 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
671 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
672 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
674 /* Length of the PC-relative instruction containing plt_got_offset. */
675 unsigned int plt_got_insn_size;
677 /* Offset of the end of the PC-relative jump to plt0_entry. */
678 unsigned int plt_plt_insn_end;
680 /* Offset into plt_entry where the initial value of the GOT entry points. */
681 unsigned int plt_lazy_offset;
683 /* .eh_frame covering the .plt section. */
684 const bfd_byte *eh_frame_plt;
685 unsigned int eh_frame_plt_size;
688 #define get_elf_x86_64_arch_data(bed) \
689 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
691 #define get_elf_x86_64_backend_data(abfd) \
692 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
694 #define GET_PLT_ENTRY_SIZE(abfd) \
695 get_elf_x86_64_backend_data (abfd)->plt_entry_size
697 /* These are the standard parameters. */
698 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
700 elf_x86_64_plt0_entry, /* plt0_entry */
701 elf_x86_64_plt_entry, /* plt_entry */
702 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
703 2, /* plt0_got1_offset */
704 8, /* plt0_got2_offset */
705 12, /* plt0_got2_insn_end */
706 2, /* plt_got_offset */
707 7, /* plt_reloc_offset */
708 12, /* plt_plt_offset */
709 6, /* plt_got_insn_size */
710 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
711 6, /* plt_lazy_offset */
712 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
713 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
716 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
718 elf_x86_64_bnd_plt0_entry, /* plt0_entry */
719 elf_x86_64_bnd_plt_entry, /* plt_entry */
720 sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
721 2, /* plt0_got1_offset */
722 1+8, /* plt0_got2_offset */
723 1+12, /* plt0_got2_insn_end */
724 1+2, /* plt_got_offset */
725 1, /* plt_reloc_offset */
726 7, /* plt_plt_offset */
727 1+6, /* plt_got_insn_size */
728 11, /* plt_plt_insn_end */
729 0, /* plt_lazy_offset */
730 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
731 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
734 #define elf_backend_arch_data &elf_x86_64_arch_bed
736 /* x86-64 ELF linker hash entry. */
738 struct elf_x86_64_link_hash_entry
740 struct elf_link_hash_entry elf;
742 /* Track dynamic relocs copied for this symbol. */
743 struct elf_dyn_relocs *dyn_relocs;
745 #define GOT_UNKNOWN 0
749 #define GOT_TLS_GDESC 4
750 #define GOT_TLS_GD_BOTH_P(type) \
751 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
752 #define GOT_TLS_GD_P(type) \
753 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
754 #define GOT_TLS_GDESC_P(type) \
755 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
756 #define GOT_TLS_GD_ANY_P(type) \
757 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
758 unsigned char tls_type;
760 /* TRUE if symbol has at least one BND relocation. */
761 bfd_boolean has_bnd_reloc;
763 /* Information about the second PLT entry. Filled when has_bnd_reloc is
765 union gotplt_union plt_bnd;
767 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
768 starting at the end of the jump table. */
772 #define elf_x86_64_hash_entry(ent) \
773 ((struct elf_x86_64_link_hash_entry *)(ent))
775 struct elf_x86_64_obj_tdata
777 struct elf_obj_tdata root;
779 /* tls_type for each local got entry. */
780 char *local_got_tls_type;
782 /* GOTPLT entries for TLS descriptors. */
783 bfd_vma *local_tlsdesc_gotent;
786 #define elf_x86_64_tdata(abfd) \
787 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
789 #define elf_x86_64_local_got_tls_type(abfd) \
790 (elf_x86_64_tdata (abfd)->local_got_tls_type)
792 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
793 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
795 #define is_x86_64_elf(bfd) \
796 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
797 && elf_tdata (bfd) != NULL \
798 && elf_object_id (bfd) == X86_64_ELF_DATA)
801 elf_x86_64_mkobject (bfd *abfd)
803 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
807 /* x86-64 ELF linker hash table. */
809 struct elf_x86_64_link_hash_table
811 struct elf_link_hash_table elf;
813 /* Short-cuts to get to dynamic linker sections. */
816 asection *plt_eh_frame;
821 bfd_signed_vma refcount;
825 /* The amount of space used by the jump slots in the GOT. */
826 bfd_vma sgotplt_jump_table_size;
828 /* Small local sym cache. */
829 struct sym_cache sym_cache;
831 bfd_vma (*r_info) (bfd_vma, bfd_vma);
832 bfd_vma (*r_sym) (bfd_vma);
833 unsigned int pointer_r_type;
834 const char *dynamic_interpreter;
835 int dynamic_interpreter_size;
837 /* _TLS_MODULE_BASE_ symbol. */
838 struct bfd_link_hash_entry *tls_module_base;
840 /* Used by local STT_GNU_IFUNC symbols. */
841 htab_t loc_hash_table;
842 void * loc_hash_memory;
844 /* The offset into splt of the PLT entry for the TLS descriptor
845 resolver. Special values are 0, if not necessary (or not found
846 to be necessary yet), and -1 if needed but not determined
849 /* The offset into sgot of the GOT entry used by the PLT entry
853 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
854 bfd_vma next_jump_slot_index;
855 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
856 bfd_vma next_irelative_index;
859 /* Get the x86-64 ELF linker hash table from a link_info structure. */
861 #define elf_x86_64_hash_table(p) \
862 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
863 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
865 #define elf_x86_64_compute_jump_table_size(htab) \
866 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
868 /* Create an entry in an x86-64 ELF linker hash table. */
870 static struct bfd_hash_entry *
871 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
872 struct bfd_hash_table *table,
875 /* Allocate the structure if it has not already been allocated by a
879 entry = (struct bfd_hash_entry *)
880 bfd_hash_allocate (table,
881 sizeof (struct elf_x86_64_link_hash_entry));
886 /* Call the allocation method of the superclass. */
887 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
890 struct elf_x86_64_link_hash_entry *eh;
892 eh = (struct elf_x86_64_link_hash_entry *) entry;
893 eh->dyn_relocs = NULL;
894 eh->tls_type = GOT_UNKNOWN;
895 eh->has_bnd_reloc = FALSE;
896 eh->plt_bnd.offset = (bfd_vma) -1;
897 eh->tlsdesc_got = (bfd_vma) -1;
903 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
904 for local symbol so that we can handle local STT_GNU_IFUNC symbols
905 as global symbol. We reuse indx and dynstr_index for local symbol
906 hash since they aren't used by global symbols in this backend. */
909 elf_x86_64_local_htab_hash (const void *ptr)
911 struct elf_link_hash_entry *h
912 = (struct elf_link_hash_entry *) ptr;
913 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
916 /* Compare local hash entries. */
919 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
921 struct elf_link_hash_entry *h1
922 = (struct elf_link_hash_entry *) ptr1;
923 struct elf_link_hash_entry *h2
924 = (struct elf_link_hash_entry *) ptr2;
926 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
929 /* Find and/or create a hash entry for local symbol. */
931 static struct elf_link_hash_entry *
932 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
933 bfd *abfd, const Elf_Internal_Rela *rel,
936 struct elf_x86_64_link_hash_entry e, *ret;
937 asection *sec = abfd->sections;
938 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
939 htab->r_sym (rel->r_info));
942 e.elf.indx = sec->id;
943 e.elf.dynstr_index = htab->r_sym (rel->r_info);
944 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
945 create ? INSERT : NO_INSERT);
952 ret = (struct elf_x86_64_link_hash_entry *) *slot;
956 ret = (struct elf_x86_64_link_hash_entry *)
957 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
958 sizeof (struct elf_x86_64_link_hash_entry));
961 memset (ret, 0, sizeof (*ret));
962 ret->elf.indx = sec->id;
963 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
964 ret->elf.dynindx = -1;
970 /* Destroy an X86-64 ELF linker hash table. */
973 elf_x86_64_link_hash_table_free (bfd *obfd)
975 struct elf_x86_64_link_hash_table *htab
976 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
978 if (htab->loc_hash_table)
979 htab_delete (htab->loc_hash_table);
980 if (htab->loc_hash_memory)
981 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
982 _bfd_elf_link_hash_table_free (obfd);
985 /* Create an X86-64 ELF linker hash table. */
987 static struct bfd_link_hash_table *
988 elf_x86_64_link_hash_table_create (bfd *abfd)
990 struct elf_x86_64_link_hash_table *ret;
991 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
993 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
997 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
998 elf_x86_64_link_hash_newfunc,
999 sizeof (struct elf_x86_64_link_hash_entry),
1006 if (ABI_64_P (abfd))
1008 ret->r_info = elf64_r_info;
1009 ret->r_sym = elf64_r_sym;
1010 ret->pointer_r_type = R_X86_64_64;
1011 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1012 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1016 ret->r_info = elf32_r_info;
1017 ret->r_sym = elf32_r_sym;
1018 ret->pointer_r_type = R_X86_64_32;
1019 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1020 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1023 ret->loc_hash_table = htab_try_create (1024,
1024 elf_x86_64_local_htab_hash,
1025 elf_x86_64_local_htab_eq,
1027 ret->loc_hash_memory = objalloc_create ();
1028 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1030 elf_x86_64_link_hash_table_free (abfd);
1033 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1035 return &ret->elf.root;
1038 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1039 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1043 elf_x86_64_create_dynamic_sections (bfd *dynobj,
1044 struct bfd_link_info *info)
1046 struct elf_x86_64_link_hash_table *htab;
1048 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1051 htab = elf_x86_64_hash_table (info);
1055 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1059 if (info->executable)
1061 /* Always allow copy relocs for building executables. */
1063 s = bfd_get_linker_section (dynobj, ".rela.bss");
1066 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1067 s = bfd_make_section_anyway_with_flags (dynobj,
1069 (bed->dynamic_sec_flags
1072 || ! bfd_set_section_alignment (dynobj, s,
1073 bed->s->log_file_align))
1079 if (!info->no_ld_generated_unwind_info
1080 && htab->plt_eh_frame == NULL
1081 && htab->elf.splt != NULL)
1083 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1084 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1085 | SEC_LINKER_CREATED);
1087 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1088 if (htab->plt_eh_frame == NULL
1089 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
1095 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1098 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1099 struct elf_link_hash_entry *dir,
1100 struct elf_link_hash_entry *ind)
1102 struct elf_x86_64_link_hash_entry *edir, *eind;
1104 edir = (struct elf_x86_64_link_hash_entry *) dir;
1105 eind = (struct elf_x86_64_link_hash_entry *) ind;
1107 if (!edir->has_bnd_reloc)
1108 edir->has_bnd_reloc = eind->has_bnd_reloc;
1110 if (eind->dyn_relocs != NULL)
1112 if (edir->dyn_relocs != NULL)
1114 struct elf_dyn_relocs **pp;
1115 struct elf_dyn_relocs *p;
1117 /* Add reloc counts against the indirect sym to the direct sym
1118 list. Merge any entries against the same section. */
1119 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1121 struct elf_dyn_relocs *q;
1123 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1124 if (q->sec == p->sec)
1126 q->pc_count += p->pc_count;
1127 q->count += p->count;
1134 *pp = edir->dyn_relocs;
1137 edir->dyn_relocs = eind->dyn_relocs;
1138 eind->dyn_relocs = NULL;
1141 if (ind->root.type == bfd_link_hash_indirect
1142 && dir->got.refcount <= 0)
1144 edir->tls_type = eind->tls_type;
1145 eind->tls_type = GOT_UNKNOWN;
1148 if (ELIMINATE_COPY_RELOCS
1149 && ind->root.type != bfd_link_hash_indirect
1150 && dir->dynamic_adjusted)
1152 /* If called to transfer flags for a weakdef during processing
1153 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1154 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1155 dir->ref_dynamic |= ind->ref_dynamic;
1156 dir->ref_regular |= ind->ref_regular;
1157 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1158 dir->needs_plt |= ind->needs_plt;
1159 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1162 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1166 elf64_x86_64_elf_object_p (bfd *abfd)
1168 /* Set the right machine number for an x86-64 elf64 file. */
1169 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1174 elf32_x86_64_elf_object_p (bfd *abfd)
1176 /* Set the right machine number for an x86-64 elf32 file. */
1177 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1181 /* Return TRUE if the TLS access code sequence support transition
1185 elf_x86_64_check_tls_transition (bfd *abfd,
1186 struct bfd_link_info *info,
1189 Elf_Internal_Shdr *symtab_hdr,
1190 struct elf_link_hash_entry **sym_hashes,
1191 unsigned int r_type,
1192 const Elf_Internal_Rela *rel,
1193 const Elf_Internal_Rela *relend)
1196 unsigned long r_symndx;
1197 bfd_boolean largepic = FALSE;
1198 struct elf_link_hash_entry *h;
1200 struct elf_x86_64_link_hash_table *htab;
1202 /* Get the section contents. */
1203 if (contents == NULL)
1205 if (elf_section_data (sec)->this_hdr.contents != NULL)
1206 contents = elf_section_data (sec)->this_hdr.contents;
1209 /* FIXME: How to better handle error condition? */
1210 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1213 /* Cache the section contents for elf_link_input_bfd. */
1214 elf_section_data (sec)->this_hdr.contents = contents;
1218 htab = elf_x86_64_hash_table (info);
1219 offset = rel->r_offset;
1222 case R_X86_64_TLSGD:
1223 case R_X86_64_TLSLD:
1224 if ((rel + 1) >= relend)
1227 if (r_type == R_X86_64_TLSGD)
1229 /* Check transition from GD access model. For 64bit, only
1230 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1231 .word 0x6666; rex64; call __tls_get_addr
1232 can transit to different access model. For 32bit, only
1233 leaq foo@tlsgd(%rip), %rdi
1234 .word 0x6666; rex64; call __tls_get_addr
1235 can transit to different access model. For largepic
1237 leaq foo@tlsgd(%rip), %rdi
1238 movabsq $__tls_get_addr@pltoff, %rax
1242 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1243 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1245 if ((offset + 12) > sec->size)
1248 if (memcmp (contents + offset + 4, call, 4) != 0)
1250 if (!ABI_64_P (abfd)
1251 || (offset + 19) > sec->size
1253 || memcmp (contents + offset - 3, leaq + 1, 3) != 0
1254 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1255 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1260 else if (ABI_64_P (abfd))
1263 || memcmp (contents + offset - 4, leaq, 4) != 0)
1269 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1275 /* Check transition from LD access model. Only
1276 leaq foo@tlsld(%rip), %rdi;
1278 can transit to different access model. For largepic
1280 leaq foo@tlsld(%rip), %rdi
1281 movabsq $__tls_get_addr@pltoff, %rax
1285 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1287 if (offset < 3 || (offset + 9) > sec->size)
1290 if (memcmp (contents + offset - 3, lea, 3) != 0)
1293 if (0xe8 != *(contents + offset + 4))
1295 if (!ABI_64_P (abfd)
1296 || (offset + 19) > sec->size
1297 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1298 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1305 r_symndx = htab->r_sym (rel[1].r_info);
1306 if (r_symndx < symtab_hdr->sh_info)
1309 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1310 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1311 may be versioned. */
1313 && h->root.root.string != NULL
1315 ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64
1316 : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1317 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32))
1318 && (strncmp (h->root.root.string,
1319 "__tls_get_addr", 14) == 0));
1321 case R_X86_64_GOTTPOFF:
1322 /* Check transition from IE access model:
1323 mov foo@gottpoff(%rip), %reg
1324 add foo@gottpoff(%rip), %reg
1327 /* Check REX prefix first. */
1328 if (offset >= 3 && (offset + 4) <= sec->size)
1330 val = bfd_get_8 (abfd, contents + offset - 3);
1331 if (val != 0x48 && val != 0x4c)
1333 /* X32 may have 0x44 REX prefix or no REX prefix. */
1334 if (ABI_64_P (abfd))
1340 /* X32 may not have any REX prefix. */
1341 if (ABI_64_P (abfd))
1343 if (offset < 2 || (offset + 3) > sec->size)
1347 val = bfd_get_8 (abfd, contents + offset - 2);
1348 if (val != 0x8b && val != 0x03)
1351 val = bfd_get_8 (abfd, contents + offset - 1);
1352 return (val & 0xc7) == 5;
1354 case R_X86_64_GOTPC32_TLSDESC:
1355 /* Check transition from GDesc access model:
1356 leaq x@tlsdesc(%rip), %rax
1358 Make sure it's a leaq adding rip to a 32-bit offset
1359 into any register, although it's probably almost always
1362 if (offset < 3 || (offset + 4) > sec->size)
1365 val = bfd_get_8 (abfd, contents + offset - 3);
1366 if ((val & 0xfb) != 0x48)
1369 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1372 val = bfd_get_8 (abfd, contents + offset - 1);
1373 return (val & 0xc7) == 0x05;
1375 case R_X86_64_TLSDESC_CALL:
1376 /* Check transition from GDesc access model:
1377 call *x@tlsdesc(%rax)
1379 if (offset + 2 <= sec->size)
1381 /* Make sure that it's a call *x@tlsdesc(%rax). */
1382 static const unsigned char call[] = { 0xff, 0x10 };
1383 return memcmp (contents + offset, call, 2) == 0;
1393 /* Return TRUE if the TLS access transition is OK or no transition
1394 will be performed. Update R_TYPE if there is a transition. */
1397 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1398 asection *sec, bfd_byte *contents,
1399 Elf_Internal_Shdr *symtab_hdr,
1400 struct elf_link_hash_entry **sym_hashes,
1401 unsigned int *r_type, int tls_type,
1402 const Elf_Internal_Rela *rel,
1403 const Elf_Internal_Rela *relend,
1404 struct elf_link_hash_entry *h,
1405 unsigned long r_symndx)
1407 unsigned int from_type = *r_type;
1408 unsigned int to_type = from_type;
1409 bfd_boolean check = TRUE;
1411 /* Skip TLS transition for functions. */
1413 && (h->type == STT_FUNC
1414 || h->type == STT_GNU_IFUNC))
1419 case R_X86_64_TLSGD:
1420 case R_X86_64_GOTPC32_TLSDESC:
1421 case R_X86_64_TLSDESC_CALL:
1422 case R_X86_64_GOTTPOFF:
1423 if (info->executable)
1426 to_type = R_X86_64_TPOFF32;
1428 to_type = R_X86_64_GOTTPOFF;
1431 /* When we are called from elf_x86_64_relocate_section,
1432 CONTENTS isn't NULL and there may be additional transitions
1433 based on TLS_TYPE. */
1434 if (contents != NULL)
1436 unsigned int new_to_type = to_type;
1438 if (info->executable
1441 && tls_type == GOT_TLS_IE)
1442 new_to_type = R_X86_64_TPOFF32;
1444 if (to_type == R_X86_64_TLSGD
1445 || to_type == R_X86_64_GOTPC32_TLSDESC
1446 || to_type == R_X86_64_TLSDESC_CALL)
1448 if (tls_type == GOT_TLS_IE)
1449 new_to_type = R_X86_64_GOTTPOFF;
1452 /* We checked the transition before when we were called from
1453 elf_x86_64_check_relocs. We only want to check the new
1454 transition which hasn't been checked before. */
1455 check = new_to_type != to_type && from_type == to_type;
1456 to_type = new_to_type;
1461 case R_X86_64_TLSLD:
1462 if (info->executable)
1463 to_type = R_X86_64_TPOFF32;
1470 /* Return TRUE if there is no transition. */
1471 if (from_type == to_type)
1474 /* Check if the transition can be performed. */
1476 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1477 symtab_hdr, sym_hashes,
1478 from_type, rel, relend))
1480 reloc_howto_type *from, *to;
1483 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1484 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1487 name = h->root.root.string;
1490 struct elf_x86_64_link_hash_table *htab;
1492 htab = elf_x86_64_hash_table (info);
1497 Elf_Internal_Sym *isym;
1499 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1501 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1505 (*_bfd_error_handler)
1506 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1507 "in section `%A' failed"),
1508 abfd, sec, from->name, to->name, name,
1509 (unsigned long) rel->r_offset);
1510 bfd_set_error (bfd_error_bad_value);
1518 /* Look through the relocs for a section during the first phase, and
1519 calculate needed space in the global offset table, procedure
1520 linkage table, and dynamic reloc sections. */
1523 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1525 const Elf_Internal_Rela *relocs)
1527 struct elf_x86_64_link_hash_table *htab;
1528 Elf_Internal_Shdr *symtab_hdr;
1529 struct elf_link_hash_entry **sym_hashes;
1530 const Elf_Internal_Rela *rel;
1531 const Elf_Internal_Rela *rel_end;
1534 if (info->relocatable)
1537 BFD_ASSERT (is_x86_64_elf (abfd));
1539 htab = elf_x86_64_hash_table (info);
1543 symtab_hdr = &elf_symtab_hdr (abfd);
1544 sym_hashes = elf_sym_hashes (abfd);
1548 rel_end = relocs + sec->reloc_count;
1549 for (rel = relocs; rel < rel_end; rel++)
1551 unsigned int r_type;
1552 unsigned long r_symndx;
1553 struct elf_link_hash_entry *h;
1554 Elf_Internal_Sym *isym;
1556 bfd_boolean size_reloc;
1558 r_symndx = htab->r_sym (rel->r_info);
1559 r_type = ELF32_R_TYPE (rel->r_info);
1561 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1563 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1568 if (r_symndx < symtab_hdr->sh_info)
1570 /* A local symbol. */
1571 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1576 /* Check relocation against local STT_GNU_IFUNC symbol. */
1577 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1579 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1584 /* Fake a STT_GNU_IFUNC symbol. */
1585 h->type = STT_GNU_IFUNC;
1588 h->forced_local = 1;
1589 h->root.type = bfd_link_hash_defined;
1597 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1598 while (h->root.type == bfd_link_hash_indirect
1599 || h->root.type == bfd_link_hash_warning)
1600 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1603 /* Check invalid x32 relocations. */
1604 if (!ABI_64_P (abfd))
1610 case R_X86_64_DTPOFF64:
1611 case R_X86_64_TPOFF64:
1613 case R_X86_64_GOTOFF64:
1614 case R_X86_64_GOT64:
1615 case R_X86_64_GOTPCREL64:
1616 case R_X86_64_GOTPC64:
1617 case R_X86_64_GOTPLT64:
1618 case R_X86_64_PLTOFF64:
1621 name = h->root.root.string;
1623 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1625 (*_bfd_error_handler)
1626 (_("%B: relocation %s against symbol `%s' isn't "
1627 "supported in x32 mode"), abfd,
1628 x86_64_elf_howto_table[r_type].name, name);
1629 bfd_set_error (bfd_error_bad_value);
1637 /* Create the ifunc sections for static executables. If we
1638 never see an indirect function symbol nor we are building
1639 a static executable, those sections will be empty and
1640 won't appear in output. */
1646 case R_X86_64_PC32_BND:
1647 case R_X86_64_PLT32_BND:
1649 case R_X86_64_PLT32:
1652 /* MPX PLT is supported only if elf_x86_64_arch_bed
1653 is used in 64-bit mode. */
1656 && (get_elf_x86_64_backend_data (abfd)
1657 == &elf_x86_64_arch_bed))
1659 elf_x86_64_hash_entry (h)->has_bnd_reloc = TRUE;
1661 /* Create the second PLT for Intel MPX support. */
1662 if (htab->plt_bnd == NULL)
1664 unsigned int plt_bnd_align;
1665 const struct elf_backend_data *bed;
1667 bed = get_elf_backend_data (info->output_bfd);
1668 switch (sizeof (elf_x86_64_bnd_plt2_entry))
1680 if (htab->elf.dynobj == NULL)
1681 htab->elf.dynobj = abfd;
1683 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1685 (bed->dynamic_sec_flags
1690 if (htab->plt_bnd == NULL
1691 || !bfd_set_section_alignment (htab->elf.dynobj,
1700 case R_X86_64_GOTPCREL:
1701 case R_X86_64_GOTPCREL64:
1702 if (htab->elf.dynobj == NULL)
1703 htab->elf.dynobj = abfd;
1704 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1709 /* It is referenced by a non-shared object. */
1711 h->root.non_ir_ref = 1;
1714 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1715 symtab_hdr, sym_hashes,
1716 &r_type, GOT_UNKNOWN,
1717 rel, rel_end, h, r_symndx))
1722 case R_X86_64_TLSLD:
1723 htab->tls_ld_got.refcount += 1;
1726 case R_X86_64_TPOFF32:
1727 if (!info->executable && ABI_64_P (abfd))
1730 name = h->root.root.string;
1732 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1734 (*_bfd_error_handler)
1735 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1737 x86_64_elf_howto_table[r_type].name, name);
1738 bfd_set_error (bfd_error_bad_value);
1743 case R_X86_64_GOTTPOFF:
1744 if (!info->executable)
1745 info->flags |= DF_STATIC_TLS;
1748 case R_X86_64_GOT32:
1749 case R_X86_64_GOTPCREL:
1750 case R_X86_64_TLSGD:
1751 case R_X86_64_GOT64:
1752 case R_X86_64_GOTPCREL64:
1753 case R_X86_64_GOTPLT64:
1754 case R_X86_64_GOTPC32_TLSDESC:
1755 case R_X86_64_TLSDESC_CALL:
1756 /* This symbol requires a global offset table entry. */
1758 int tls_type, old_tls_type;
1762 default: tls_type = GOT_NORMAL; break;
1763 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1764 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1765 case R_X86_64_GOTPC32_TLSDESC:
1766 case R_X86_64_TLSDESC_CALL:
1767 tls_type = GOT_TLS_GDESC; break;
1772 if (r_type == R_X86_64_GOTPLT64)
1774 /* This relocation indicates that we also need
1775 a PLT entry, as this is a function. We don't need
1776 a PLT entry for local symbols. */
1778 h->plt.refcount += 1;
1780 h->got.refcount += 1;
1781 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1785 bfd_signed_vma *local_got_refcounts;
1787 /* This is a global offset table entry for a local symbol. */
1788 local_got_refcounts = elf_local_got_refcounts (abfd);
1789 if (local_got_refcounts == NULL)
1793 size = symtab_hdr->sh_info;
1794 size *= sizeof (bfd_signed_vma)
1795 + sizeof (bfd_vma) + sizeof (char);
1796 local_got_refcounts = ((bfd_signed_vma *)
1797 bfd_zalloc (abfd, size));
1798 if (local_got_refcounts == NULL)
1800 elf_local_got_refcounts (abfd) = local_got_refcounts;
1801 elf_x86_64_local_tlsdesc_gotent (abfd)
1802 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1803 elf_x86_64_local_got_tls_type (abfd)
1804 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1806 local_got_refcounts[r_symndx] += 1;
1808 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1811 /* If a TLS symbol is accessed using IE at least once,
1812 there is no point to use dynamic model for it. */
1813 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1814 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1815 || tls_type != GOT_TLS_IE))
1817 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1818 tls_type = old_tls_type;
1819 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1820 && GOT_TLS_GD_ANY_P (tls_type))
1821 tls_type |= old_tls_type;
1825 name = h->root.root.string;
1827 name = bfd_elf_sym_name (abfd, symtab_hdr,
1829 (*_bfd_error_handler)
1830 (_("%B: '%s' accessed both as normal and thread local symbol"),
1832 bfd_set_error (bfd_error_bad_value);
1837 if (old_tls_type != tls_type)
1840 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1842 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1847 case R_X86_64_GOTOFF64:
1848 case R_X86_64_GOTPC32:
1849 case R_X86_64_GOTPC64:
1851 if (htab->elf.sgot == NULL)
1853 if (htab->elf.dynobj == NULL)
1854 htab->elf.dynobj = abfd;
1855 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1861 case R_X86_64_PLT32:
1862 case R_X86_64_PLT32_BND:
1863 /* This symbol requires a procedure linkage table entry. We
1864 actually build the entry in adjust_dynamic_symbol,
1865 because this might be a case of linking PIC code which is
1866 never referenced by a dynamic object, in which case we
1867 don't need to generate a procedure linkage table entry
1870 /* If this is a local symbol, we resolve it directly without
1871 creating a procedure linkage table entry. */
1876 h->plt.refcount += 1;
1879 case R_X86_64_PLTOFF64:
1880 /* This tries to form the 'address' of a function relative
1881 to GOT. For global symbols we need a PLT entry. */
1885 h->plt.refcount += 1;
1889 case R_X86_64_SIZE32:
1890 case R_X86_64_SIZE64:
1895 if (!ABI_64_P (abfd))
1900 /* Let's help debug shared library creation. These relocs
1901 cannot be used in shared libs. Don't error out for
1902 sections we don't care about, such as debug sections or
1903 non-constant sections. */
1905 && (sec->flags & SEC_ALLOC) != 0
1906 && (sec->flags & SEC_READONLY) != 0)
1909 name = h->root.root.string;
1911 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1912 (*_bfd_error_handler)
1913 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1914 abfd, x86_64_elf_howto_table[r_type].name, name);
1915 bfd_set_error (bfd_error_bad_value);
1923 case R_X86_64_PC32_BND:
1927 if (h != NULL && info->executable)
1929 /* If this reloc is in a read-only section, we might
1930 need a copy reloc. We can't check reliably at this
1931 stage whether the section is read-only, as input
1932 sections have not yet been mapped to output sections.
1933 Tentatively set the flag for now, and correct in
1934 adjust_dynamic_symbol. */
1937 /* We may need a .plt entry if the function this reloc
1938 refers to is in a shared lib. */
1939 h->plt.refcount += 1;
1940 if (r_type != R_X86_64_PC32
1941 && r_type != R_X86_64_PC32_BND
1942 && r_type != R_X86_64_PC64)
1943 h->pointer_equality_needed = 1;
1948 /* If we are creating a shared library, and this is a reloc
1949 against a global symbol, or a non PC relative reloc
1950 against a local symbol, then we need to copy the reloc
1951 into the shared library. However, if we are linking with
1952 -Bsymbolic, we do not need to copy a reloc against a
1953 global symbol which is defined in an object we are
1954 including in the link (i.e., DEF_REGULAR is set). At
1955 this point we have not seen all the input files, so it is
1956 possible that DEF_REGULAR is not set now but will be set
1957 later (it is never cleared). In case of a weak definition,
1958 DEF_REGULAR may be cleared later by a strong definition in
1959 a shared library. We account for that possibility below by
1960 storing information in the relocs_copied field of the hash
1961 table entry. A similar situation occurs when creating
1962 shared libraries and symbol visibility changes render the
1965 If on the other hand, we are creating an executable, we
1966 may need to keep relocations for symbols satisfied by a
1967 dynamic library if we manage to avoid copy relocs for the
1970 && (sec->flags & SEC_ALLOC) != 0
1971 && (! IS_X86_64_PCREL_TYPE (r_type)
1973 && (! SYMBOLIC_BIND (info, h)
1974 || h->root.type == bfd_link_hash_defweak
1975 || !h->def_regular))))
1976 || (ELIMINATE_COPY_RELOCS
1978 && (sec->flags & SEC_ALLOC) != 0
1980 && (h->root.type == bfd_link_hash_defweak
1981 || !h->def_regular)))
1983 struct elf_dyn_relocs *p;
1984 struct elf_dyn_relocs **head;
1986 /* We must copy these reloc types into the output file.
1987 Create a reloc section in dynobj and make room for
1991 if (htab->elf.dynobj == NULL)
1992 htab->elf.dynobj = abfd;
1994 sreloc = _bfd_elf_make_dynamic_reloc_section
1995 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1996 abfd, /*rela?*/ TRUE);
2002 /* If this is a global symbol, we count the number of
2003 relocations we need for this symbol. */
2006 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
2010 /* Track dynamic relocs needed for local syms too.
2011 We really need local syms available to do this
2016 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2021 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2025 /* Beware of type punned pointers vs strict aliasing
2027 vpp = &(elf_section_data (s)->local_dynrel);
2028 head = (struct elf_dyn_relocs **)vpp;
2032 if (p == NULL || p->sec != sec)
2034 bfd_size_type amt = sizeof *p;
2036 p = ((struct elf_dyn_relocs *)
2037 bfd_alloc (htab->elf.dynobj, amt));
2048 /* Count size relocation as PC-relative relocation. */
2049 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2054 /* This relocation describes the C++ object vtable hierarchy.
2055 Reconstruct it for later use during GC. */
2056 case R_X86_64_GNU_VTINHERIT:
2057 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2061 /* This relocation describes which C++ vtable entries are actually
2062 used. Record for later use during GC. */
2063 case R_X86_64_GNU_VTENTRY:
2064 BFD_ASSERT (h != NULL);
2066 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2078 /* Return the section that should be marked against GC for a given
2082 elf_x86_64_gc_mark_hook (asection *sec,
2083 struct bfd_link_info *info,
2084 Elf_Internal_Rela *rel,
2085 struct elf_link_hash_entry *h,
2086 Elf_Internal_Sym *sym)
2089 switch (ELF32_R_TYPE (rel->r_info))
2091 case R_X86_64_GNU_VTINHERIT:
2092 case R_X86_64_GNU_VTENTRY:
2096 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2099 /* Update the got entry reference counts for the section being removed. */
2102 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
2104 const Elf_Internal_Rela *relocs)
2106 struct elf_x86_64_link_hash_table *htab;
2107 Elf_Internal_Shdr *symtab_hdr;
2108 struct elf_link_hash_entry **sym_hashes;
2109 bfd_signed_vma *local_got_refcounts;
2110 const Elf_Internal_Rela *rel, *relend;
2112 if (info->relocatable)
2115 htab = elf_x86_64_hash_table (info);
2119 elf_section_data (sec)->local_dynrel = NULL;
2121 symtab_hdr = &elf_symtab_hdr (abfd);
2122 sym_hashes = elf_sym_hashes (abfd);
2123 local_got_refcounts = elf_local_got_refcounts (abfd);
2125 htab = elf_x86_64_hash_table (info);
2126 relend = relocs + sec->reloc_count;
2127 for (rel = relocs; rel < relend; rel++)
2129 unsigned long r_symndx;
2130 unsigned int r_type;
2131 struct elf_link_hash_entry *h = NULL;
2133 r_symndx = htab->r_sym (rel->r_info);
2134 if (r_symndx >= symtab_hdr->sh_info)
2136 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2137 while (h->root.type == bfd_link_hash_indirect
2138 || h->root.type == bfd_link_hash_warning)
2139 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2143 /* A local symbol. */
2144 Elf_Internal_Sym *isym;
2146 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2149 /* Check relocation against local STT_GNU_IFUNC symbol. */
2151 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2153 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2161 struct elf_x86_64_link_hash_entry *eh;
2162 struct elf_dyn_relocs **pp;
2163 struct elf_dyn_relocs *p;
2165 eh = (struct elf_x86_64_link_hash_entry *) h;
2167 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2170 /* Everything must go for SEC. */
2176 r_type = ELF32_R_TYPE (rel->r_info);
2177 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2178 symtab_hdr, sym_hashes,
2179 &r_type, GOT_UNKNOWN,
2180 rel, relend, h, r_symndx))
2185 case R_X86_64_TLSLD:
2186 if (htab->tls_ld_got.refcount > 0)
2187 htab->tls_ld_got.refcount -= 1;
2190 case R_X86_64_TLSGD:
2191 case R_X86_64_GOTPC32_TLSDESC:
2192 case R_X86_64_TLSDESC_CALL:
2193 case R_X86_64_GOTTPOFF:
2194 case R_X86_64_GOT32:
2195 case R_X86_64_GOTPCREL:
2196 case R_X86_64_GOT64:
2197 case R_X86_64_GOTPCREL64:
2198 case R_X86_64_GOTPLT64:
2201 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
2202 h->plt.refcount -= 1;
2203 if (h->got.refcount > 0)
2204 h->got.refcount -= 1;
2205 if (h->type == STT_GNU_IFUNC)
2207 if (h->plt.refcount > 0)
2208 h->plt.refcount -= 1;
2211 else if (local_got_refcounts != NULL)
2213 if (local_got_refcounts[r_symndx] > 0)
2214 local_got_refcounts[r_symndx] -= 1;
2226 case R_X86_64_PC32_BND:
2228 case R_X86_64_SIZE32:
2229 case R_X86_64_SIZE64:
2231 && (h == NULL || h->type != STT_GNU_IFUNC))
2235 case R_X86_64_PLT32:
2236 case R_X86_64_PLT32_BND:
2237 case R_X86_64_PLTOFF64:
2240 if (h->plt.refcount > 0)
2241 h->plt.refcount -= 1;
2253 /* Adjust a symbol defined by a dynamic object and referenced by a
2254 regular object. The current definition is in some section of the
2255 dynamic object, but we're not including those sections. We have to
2256 change the definition to something the rest of the link can
2260 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2261 struct elf_link_hash_entry *h)
2263 struct elf_x86_64_link_hash_table *htab;
2265 struct elf_x86_64_link_hash_entry *eh;
2266 struct elf_dyn_relocs *p;
2268 /* STT_GNU_IFUNC symbol must go through PLT. */
2269 if (h->type == STT_GNU_IFUNC)
2271 /* All local STT_GNU_IFUNC references must be treate as local
2272 calls via local PLT. */
2274 && SYMBOL_CALLS_LOCAL (info, h))
2276 bfd_size_type pc_count = 0, count = 0;
2277 struct elf_dyn_relocs **pp;
2279 eh = (struct elf_x86_64_link_hash_entry *) h;
2280 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2282 pc_count += p->pc_count;
2283 p->count -= p->pc_count;
2292 if (pc_count || count)
2296 if (h->plt.refcount <= 0)
2297 h->plt.refcount = 1;
2299 h->plt.refcount += 1;
2303 if (h->plt.refcount <= 0)
2305 h->plt.offset = (bfd_vma) -1;
2311 /* If this is a function, put it in the procedure linkage table. We
2312 will fill in the contents of the procedure linkage table later,
2313 when we know the address of the .got section. */
2314 if (h->type == STT_FUNC
2317 if (h->plt.refcount <= 0
2318 || SYMBOL_CALLS_LOCAL (info, h)
2319 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2320 && h->root.type == bfd_link_hash_undefweak))
2322 /* This case can occur if we saw a PLT32 reloc in an input
2323 file, but the symbol was never referred to by a dynamic
2324 object, or if all references were garbage collected. In
2325 such a case, we don't actually need to build a procedure
2326 linkage table, and we can just do a PC32 reloc instead. */
2327 h->plt.offset = (bfd_vma) -1;
2334 /* It's possible that we incorrectly decided a .plt reloc was
2335 needed for an R_X86_64_PC32 reloc to a non-function sym in
2336 check_relocs. We can't decide accurately between function and
2337 non-function syms in check-relocs; Objects loaded later in
2338 the link may change h->type. So fix it now. */
2339 h->plt.offset = (bfd_vma) -1;
2341 /* If this is a weak symbol, and there is a real definition, the
2342 processor independent code will have arranged for us to see the
2343 real definition first, and we can just use the same value. */
2344 if (h->u.weakdef != NULL)
2346 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2347 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2348 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2349 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2350 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2351 h->non_got_ref = h->u.weakdef->non_got_ref;
2355 /* This is a reference to a symbol defined by a dynamic object which
2356 is not a function. */
2358 /* If we are creating a shared library, we must presume that the
2359 only references to the symbol are via the global offset table.
2360 For such cases we need not do anything here; the relocations will
2361 be handled correctly by relocate_section. */
2362 if (!info->executable)
2365 /* If there are no references to this symbol that do not use the
2366 GOT, we don't need to generate a copy reloc. */
2367 if (!h->non_got_ref)
2370 /* If -z nocopyreloc was given, we won't generate them either. */
2371 if (info->nocopyreloc)
2377 if (ELIMINATE_COPY_RELOCS)
2379 eh = (struct elf_x86_64_link_hash_entry *) h;
2380 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2382 s = p->sec->output_section;
2383 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2387 /* If we didn't find any dynamic relocs in read-only sections, then
2388 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2396 /* We must allocate the symbol in our .dynbss section, which will
2397 become part of the .bss section of the executable. There will be
2398 an entry for this symbol in the .dynsym section. The dynamic
2399 object will contain position independent code, so all references
2400 from the dynamic object to this symbol will go through the global
2401 offset table. The dynamic linker will use the .dynsym entry to
2402 determine the address it must put in the global offset table, so
2403 both the dynamic object and the regular object will refer to the
2404 same memory location for the variable. */
2406 htab = elf_x86_64_hash_table (info);
2410 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2411 to copy the initial value out of the dynamic object and into the
2412 runtime process image. */
2413 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2415 const struct elf_backend_data *bed;
2416 bed = get_elf_backend_data (info->output_bfd);
2417 htab->srelbss->size += bed->s->sizeof_rela;
2423 return _bfd_elf_adjust_dynamic_copy (h, s);
2426 /* Allocate space in .plt, .got and associated reloc sections for
2430 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2432 struct bfd_link_info *info;
2433 struct elf_x86_64_link_hash_table *htab;
2434 struct elf_x86_64_link_hash_entry *eh;
2435 struct elf_dyn_relocs *p;
2436 const struct elf_backend_data *bed;
2437 unsigned int plt_entry_size;
2439 if (h->root.type == bfd_link_hash_indirect)
2442 eh = (struct elf_x86_64_link_hash_entry *) h;
2444 info = (struct bfd_link_info *) inf;
2445 htab = elf_x86_64_hash_table (info);
2448 bed = get_elf_backend_data (info->output_bfd);
2449 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2451 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2452 here if it is defined and referenced in a non-shared object. */
2453 if (h->type == STT_GNU_IFUNC
2456 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2462 asection *s = htab->plt_bnd;
2463 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2465 /* Use the .plt.bnd section if it is created. */
2466 eh->plt_bnd.offset = s->size;
2468 /* Make room for this entry in the .plt.bnd section. */
2469 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2477 else if (htab->elf.dynamic_sections_created
2478 && h->plt.refcount > 0)
2480 /* Make sure this symbol is output as a dynamic symbol.
2481 Undefined weak syms won't yet be marked as dynamic. */
2482 if (h->dynindx == -1
2483 && !h->forced_local)
2485 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2490 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2492 asection *s = htab->elf.splt;
2493 asection *bnd_s = htab->plt_bnd;
2495 /* If this is the first .plt entry, make room for the special
2498 s->size = plt_entry_size;
2500 h->plt.offset = s->size;
2502 eh->plt_bnd.offset = bnd_s->size;
2504 /* If this symbol is not defined in a regular file, and we are
2505 not generating a shared library, then set the symbol to this
2506 location in the .plt. This is required to make function
2507 pointers compare as equal between the normal executable and
2508 the shared library. */
2514 /* We need to make a call to the entry of the second
2515 PLT instead of regular PLT entry. */
2516 h->root.u.def.section = bnd_s;
2517 h->root.u.def.value = eh->plt_bnd.offset;
2521 h->root.u.def.section = s;
2522 h->root.u.def.value = h->plt.offset;
2526 /* Make room for this entry. */
2527 s->size += plt_entry_size;
2530 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry)
2531 == sizeof (elf_x86_64_legacy_plt2_entry));
2532 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2535 /* We also need to make an entry in the .got.plt section, which
2536 will be placed in the .got section by the linker script. */
2537 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2539 /* We also need to make an entry in the .rela.plt section. */
2540 htab->elf.srelplt->size += bed->s->sizeof_rela;
2541 htab->elf.srelplt->reloc_count++;
2545 h->plt.offset = (bfd_vma) -1;
2551 h->plt.offset = (bfd_vma) -1;
2555 eh->tlsdesc_got = (bfd_vma) -1;
2557 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2558 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2559 if (h->got.refcount > 0
2562 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2564 h->got.offset = (bfd_vma) -1;
2566 else if (h->got.refcount > 0)
2570 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2572 /* Make sure this symbol is output as a dynamic symbol.
2573 Undefined weak syms won't yet be marked as dynamic. */
2574 if (h->dynindx == -1
2575 && !h->forced_local)
2577 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2581 if (GOT_TLS_GDESC_P (tls_type))
2583 eh->tlsdesc_got = htab->elf.sgotplt->size
2584 - elf_x86_64_compute_jump_table_size (htab);
2585 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2586 h->got.offset = (bfd_vma) -2;
2588 if (! GOT_TLS_GDESC_P (tls_type)
2589 || GOT_TLS_GD_P (tls_type))
2592 h->got.offset = s->size;
2593 s->size += GOT_ENTRY_SIZE;
2594 if (GOT_TLS_GD_P (tls_type))
2595 s->size += GOT_ENTRY_SIZE;
2597 dyn = htab->elf.dynamic_sections_created;
2598 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2600 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2601 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2602 || tls_type == GOT_TLS_IE)
2603 htab->elf.srelgot->size += bed->s->sizeof_rela;
2604 else if (GOT_TLS_GD_P (tls_type))
2605 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2606 else if (! GOT_TLS_GDESC_P (tls_type)
2607 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2608 || h->root.type != bfd_link_hash_undefweak)
2610 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2611 htab->elf.srelgot->size += bed->s->sizeof_rela;
2612 if (GOT_TLS_GDESC_P (tls_type))
2614 htab->elf.srelplt->size += bed->s->sizeof_rela;
2615 htab->tlsdesc_plt = (bfd_vma) -1;
2619 h->got.offset = (bfd_vma) -1;
2621 if (eh->dyn_relocs == NULL)
2624 /* In the shared -Bsymbolic case, discard space allocated for
2625 dynamic pc-relative relocs against symbols which turn out to be
2626 defined in regular objects. For the normal shared case, discard
2627 space for pc-relative relocs that have become local due to symbol
2628 visibility changes. */
2632 /* Relocs that use pc_count are those that appear on a call
2633 insn, or certain REL relocs that can generated via assembly.
2634 We want calls to protected symbols to resolve directly to the
2635 function rather than going via the plt. If people want
2636 function pointer comparisons to work as expected then they
2637 should avoid writing weird assembly. */
2638 if (SYMBOL_CALLS_LOCAL (info, h))
2640 struct elf_dyn_relocs **pp;
2642 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2644 p->count -= p->pc_count;
2653 /* Also discard relocs on undefined weak syms with non-default
2655 if (eh->dyn_relocs != NULL)
2657 if (h->root.type == bfd_link_hash_undefweak)
2659 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2660 eh->dyn_relocs = NULL;
2662 /* Make sure undefined weak symbols are output as a dynamic
2664 else if (h->dynindx == -1
2665 && ! h->forced_local
2666 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2669 /* For PIE, discard space for relocs against symbols which
2670 turn out to need copy relocs. */
2671 else if (info->executable
2675 eh->dyn_relocs = NULL;
2678 else if (ELIMINATE_COPY_RELOCS)
2680 /* For the non-shared case, discard space for relocs against
2681 symbols which turn out to need copy relocs or are not
2687 || (htab->elf.dynamic_sections_created
2688 && (h->root.type == bfd_link_hash_undefweak
2689 || h->root.type == bfd_link_hash_undefined))))
2691 /* Make sure this symbol is output as a dynamic symbol.
2692 Undefined weak syms won't yet be marked as dynamic. */
2693 if (h->dynindx == -1
2694 && ! h->forced_local
2695 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2698 /* If that succeeded, we know we'll be keeping all the
2700 if (h->dynindx != -1)
2704 eh->dyn_relocs = NULL;
2709 /* Finally, allocate space. */
2710 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2714 sreloc = elf_section_data (p->sec)->sreloc;
2716 BFD_ASSERT (sreloc != NULL);
2718 sreloc->size += p->count * bed->s->sizeof_rela;
2724 /* Allocate space in .plt, .got and associated reloc sections for
2725 local dynamic relocs. */
2728 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2730 struct elf_link_hash_entry *h
2731 = (struct elf_link_hash_entry *) *slot;
2733 if (h->type != STT_GNU_IFUNC
2737 || h->root.type != bfd_link_hash_defined)
2740 return elf_x86_64_allocate_dynrelocs (h, inf);
2743 /* Find any dynamic relocs that apply to read-only sections. */
2746 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2749 struct elf_x86_64_link_hash_entry *eh;
2750 struct elf_dyn_relocs *p;
2752 /* Skip local IFUNC symbols. */
2753 if (h->forced_local && h->type == STT_GNU_IFUNC)
2756 eh = (struct elf_x86_64_link_hash_entry *) h;
2757 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2759 asection *s = p->sec->output_section;
2761 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2763 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2765 info->flags |= DF_TEXTREL;
2767 if (info->warn_shared_textrel && info->shared)
2768 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2769 p->sec->owner, h->root.root.string,
2772 /* Not an error, just cut short the traversal. */
2780 mov foo@GOTPCREL(%rip), %reg
2783 with the local symbol, foo. */
2786 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2787 struct bfd_link_info *link_info)
2789 Elf_Internal_Shdr *symtab_hdr;
2790 Elf_Internal_Rela *internal_relocs;
2791 Elf_Internal_Rela *irel, *irelend;
2793 struct elf_x86_64_link_hash_table *htab;
2794 bfd_boolean changed_contents;
2795 bfd_boolean changed_relocs;
2796 bfd_signed_vma *local_got_refcounts;
2798 /* Don't even try to convert non-ELF outputs. */
2799 if (!is_elf_hash_table (link_info->hash))
2802 /* Nothing to do if there are no codes, no relocations or no output. */
2803 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2804 || sec->reloc_count == 0
2805 || bfd_is_abs_section (sec->output_section))
2808 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2810 /* Load the relocations for this section. */
2811 internal_relocs = (_bfd_elf_link_read_relocs
2812 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2813 link_info->keep_memory));
2814 if (internal_relocs == NULL)
2817 htab = elf_x86_64_hash_table (link_info);
2818 changed_contents = FALSE;
2819 changed_relocs = FALSE;
2820 local_got_refcounts = elf_local_got_refcounts (abfd);
2822 /* Get the section contents. */
2823 if (elf_section_data (sec)->this_hdr.contents != NULL)
2824 contents = elf_section_data (sec)->this_hdr.contents;
2827 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2831 irelend = internal_relocs + sec->reloc_count;
2832 for (irel = internal_relocs; irel < irelend; irel++)
2834 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2835 unsigned int r_symndx = htab->r_sym (irel->r_info);
2837 struct elf_link_hash_entry *h;
2839 if (r_type != R_X86_64_GOTPCREL)
2842 /* Get the symbol referred to by the reloc. */
2843 if (r_symndx < symtab_hdr->sh_info)
2845 Elf_Internal_Sym *isym;
2847 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2850 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2851 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2852 && bfd_get_8 (input_bfd,
2853 contents + irel->r_offset - 2) == 0x8b)
2855 bfd_put_8 (output_bfd, 0x8d,
2856 contents + irel->r_offset - 2);
2857 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2858 if (local_got_refcounts != NULL
2859 && local_got_refcounts[r_symndx] > 0)
2860 local_got_refcounts[r_symndx] -= 1;
2861 changed_contents = TRUE;
2862 changed_relocs = TRUE;
2867 indx = r_symndx - symtab_hdr->sh_info;
2868 h = elf_sym_hashes (abfd)[indx];
2869 BFD_ASSERT (h != NULL);
2871 while (h->root.type == bfd_link_hash_indirect
2872 || h->root.type == bfd_link_hash_warning)
2873 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2875 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2876 avoid optimizing _DYNAMIC since ld.so may use its link-time
2879 && h->type != STT_GNU_IFUNC
2880 && h != htab->elf.hdynamic
2881 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2882 && bfd_get_8 (input_bfd,
2883 contents + irel->r_offset - 2) == 0x8b)
2885 bfd_put_8 (output_bfd, 0x8d,
2886 contents + irel->r_offset - 2);
2887 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2888 if (h->got.refcount > 0)
2889 h->got.refcount -= 1;
2890 changed_contents = TRUE;
2891 changed_relocs = TRUE;
2895 if (contents != NULL
2896 && elf_section_data (sec)->this_hdr.contents != contents)
2898 if (!changed_contents && !link_info->keep_memory)
2902 /* Cache the section contents for elf_link_input_bfd. */
2903 elf_section_data (sec)->this_hdr.contents = contents;
2907 if (elf_section_data (sec)->relocs != internal_relocs)
2909 if (!changed_relocs)
2910 free (internal_relocs);
2912 elf_section_data (sec)->relocs = internal_relocs;
2918 if (contents != NULL
2919 && elf_section_data (sec)->this_hdr.contents != contents)
2921 if (internal_relocs != NULL
2922 && elf_section_data (sec)->relocs != internal_relocs)
2923 free (internal_relocs);
2927 /* Set the sizes of the dynamic sections. */
2930 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2931 struct bfd_link_info *info)
2933 struct elf_x86_64_link_hash_table *htab;
2938 const struct elf_backend_data *bed;
2940 htab = elf_x86_64_hash_table (info);
2943 bed = get_elf_backend_data (output_bfd);
2945 dynobj = htab->elf.dynobj;
2949 if (htab->elf.dynamic_sections_created)
2951 /* Set the contents of the .interp section to the interpreter. */
2952 if (info->executable)
2954 s = bfd_get_linker_section (dynobj, ".interp");
2957 s->size = htab->dynamic_interpreter_size;
2958 s->contents = (unsigned char *) htab->dynamic_interpreter;
2962 /* Set up .got offsets for local syms, and space for local dynamic
2964 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2966 bfd_signed_vma *local_got;
2967 bfd_signed_vma *end_local_got;
2968 char *local_tls_type;
2969 bfd_vma *local_tlsdesc_gotent;
2970 bfd_size_type locsymcount;
2971 Elf_Internal_Shdr *symtab_hdr;
2974 if (! is_x86_64_elf (ibfd))
2977 for (s = ibfd->sections; s != NULL; s = s->next)
2979 struct elf_dyn_relocs *p;
2981 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
2984 for (p = (struct elf_dyn_relocs *)
2985 (elf_section_data (s)->local_dynrel);
2989 if (!bfd_is_abs_section (p->sec)
2990 && bfd_is_abs_section (p->sec->output_section))
2992 /* Input section has been discarded, either because
2993 it is a copy of a linkonce section or due to
2994 linker script /DISCARD/, so we'll be discarding
2997 else if (p->count != 0)
2999 srel = elf_section_data (p->sec)->sreloc;
3000 srel->size += p->count * bed->s->sizeof_rela;
3001 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3002 && (info->flags & DF_TEXTREL) == 0)
3004 info->flags |= DF_TEXTREL;
3005 if (info->warn_shared_textrel && info->shared)
3006 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
3007 p->sec->owner, p->sec);
3013 local_got = elf_local_got_refcounts (ibfd);
3017 symtab_hdr = &elf_symtab_hdr (ibfd);
3018 locsymcount = symtab_hdr->sh_info;
3019 end_local_got = local_got + locsymcount;
3020 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3021 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3023 srel = htab->elf.srelgot;
3024 for (; local_got < end_local_got;
3025 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3027 *local_tlsdesc_gotent = (bfd_vma) -1;
3030 if (GOT_TLS_GDESC_P (*local_tls_type))
3032 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3033 - elf_x86_64_compute_jump_table_size (htab);
3034 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3035 *local_got = (bfd_vma) -2;
3037 if (! GOT_TLS_GDESC_P (*local_tls_type)
3038 || GOT_TLS_GD_P (*local_tls_type))
3040 *local_got = s->size;
3041 s->size += GOT_ENTRY_SIZE;
3042 if (GOT_TLS_GD_P (*local_tls_type))
3043 s->size += GOT_ENTRY_SIZE;
3046 || GOT_TLS_GD_ANY_P (*local_tls_type)
3047 || *local_tls_type == GOT_TLS_IE)
3049 if (GOT_TLS_GDESC_P (*local_tls_type))
3051 htab->elf.srelplt->size
3052 += bed->s->sizeof_rela;
3053 htab->tlsdesc_plt = (bfd_vma) -1;
3055 if (! GOT_TLS_GDESC_P (*local_tls_type)
3056 || GOT_TLS_GD_P (*local_tls_type))
3057 srel->size += bed->s->sizeof_rela;
3061 *local_got = (bfd_vma) -1;
3065 if (htab->tls_ld_got.refcount > 0)
3067 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3069 htab->tls_ld_got.offset = htab->elf.sgot->size;
3070 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3071 htab->elf.srelgot->size += bed->s->sizeof_rela;
3074 htab->tls_ld_got.offset = -1;
3076 /* Allocate global sym .plt and .got entries, and space for global
3077 sym dynamic relocs. */
3078 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3081 /* Allocate .plt and .got entries, and space for local symbols. */
3082 htab_traverse (htab->loc_hash_table,
3083 elf_x86_64_allocate_local_dynrelocs,
3086 /* For every jump slot reserved in the sgotplt, reloc_count is
3087 incremented. However, when we reserve space for TLS descriptors,
3088 it's not incremented, so in order to compute the space reserved
3089 for them, it suffices to multiply the reloc count by the jump
3092 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3093 so that R_X86_64_IRELATIVE entries come last. */
3094 if (htab->elf.srelplt)
3096 htab->sgotplt_jump_table_size
3097 = elf_x86_64_compute_jump_table_size (htab);
3098 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3100 else if (htab->elf.irelplt)
3101 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3103 if (htab->tlsdesc_plt)
3105 /* If we're not using lazy TLS relocations, don't generate the
3106 PLT and GOT entries they require. */
3107 if ((info->flags & DF_BIND_NOW))
3108 htab->tlsdesc_plt = 0;
3111 htab->tlsdesc_got = htab->elf.sgot->size;
3112 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3113 /* Reserve room for the initial entry.
3114 FIXME: we could probably do away with it in this case. */
3115 if (htab->elf.splt->size == 0)
3116 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3117 htab->tlsdesc_plt = htab->elf.splt->size;
3118 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3122 if (htab->elf.sgotplt)
3124 /* Don't allocate .got.plt section if there are no GOT nor PLT
3125 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3126 if ((htab->elf.hgot == NULL
3127 || !htab->elf.hgot->ref_regular_nonweak)
3128 && (htab->elf.sgotplt->size
3129 == get_elf_backend_data (output_bfd)->got_header_size)
3130 && (htab->elf.splt == NULL
3131 || htab->elf.splt->size == 0)
3132 && (htab->elf.sgot == NULL
3133 || htab->elf.sgot->size == 0)
3134 && (htab->elf.iplt == NULL
3135 || htab->elf.iplt->size == 0)
3136 && (htab->elf.igotplt == NULL
3137 || htab->elf.igotplt->size == 0))
3138 htab->elf.sgotplt->size = 0;
3141 if (htab->plt_eh_frame != NULL
3142 && htab->elf.splt != NULL
3143 && htab->elf.splt->size != 0
3144 && !bfd_is_abs_section (htab->elf.splt->output_section)
3145 && _bfd_elf_eh_frame_present (info))
3147 const struct elf_x86_64_backend_data *arch_data
3148 = get_elf_x86_64_arch_data (bed);
3149 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3152 /* We now have determined the sizes of the various dynamic sections.
3153 Allocate memory for them. */
3155 for (s = dynobj->sections; s != NULL; s = s->next)
3157 if ((s->flags & SEC_LINKER_CREATED) == 0)
3160 if (s == htab->elf.splt
3161 || s == htab->elf.sgot
3162 || s == htab->elf.sgotplt
3163 || s == htab->elf.iplt
3164 || s == htab->elf.igotplt
3165 || s == htab->plt_bnd
3166 || s == htab->plt_eh_frame
3167 || s == htab->sdynbss)
3169 /* Strip this section if we don't need it; see the
3172 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3174 if (s->size != 0 && s != htab->elf.srelplt)
3177 /* We use the reloc_count field as a counter if we need
3178 to copy relocs into the output file. */
3179 if (s != htab->elf.srelplt)
3184 /* It's not one of our sections, so don't allocate space. */
3190 /* If we don't need this section, strip it from the
3191 output file. This is mostly to handle .rela.bss and
3192 .rela.plt. We must create both sections in
3193 create_dynamic_sections, because they must be created
3194 before the linker maps input sections to output
3195 sections. The linker does that before
3196 adjust_dynamic_symbol is called, and it is that
3197 function which decides whether anything needs to go
3198 into these sections. */
3200 s->flags |= SEC_EXCLUDE;
3204 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3207 /* Allocate memory for the section contents. We use bfd_zalloc
3208 here in case unused entries are not reclaimed before the
3209 section's contents are written out. This should not happen,
3210 but this way if it does, we get a R_X86_64_NONE reloc instead
3212 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3213 if (s->contents == NULL)
3217 if (htab->plt_eh_frame != NULL
3218 && htab->plt_eh_frame->contents != NULL)
3220 const struct elf_x86_64_backend_data *arch_data
3221 = get_elf_x86_64_arch_data (bed);
3223 memcpy (htab->plt_eh_frame->contents,
3224 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3225 bfd_put_32 (dynobj, htab->elf.splt->size,
3226 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3229 if (htab->elf.dynamic_sections_created)
3231 /* Add some entries to the .dynamic section. We fill in the
3232 values later, in elf_x86_64_finish_dynamic_sections, but we
3233 must add the entries now so that we get the correct size for
3234 the .dynamic section. The DT_DEBUG entry is filled in by the
3235 dynamic linker and used by the debugger. */
3236 #define add_dynamic_entry(TAG, VAL) \
3237 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3239 if (info->executable)
3241 if (!add_dynamic_entry (DT_DEBUG, 0))
3245 if (htab->elf.splt->size != 0)
3247 if (!add_dynamic_entry (DT_PLTGOT, 0)
3248 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3249 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3250 || !add_dynamic_entry (DT_JMPREL, 0))
3253 if (htab->tlsdesc_plt
3254 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3255 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3261 if (!add_dynamic_entry (DT_RELA, 0)
3262 || !add_dynamic_entry (DT_RELASZ, 0)
3263 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3266 /* If any dynamic relocs apply to a read-only section,
3267 then we need a DT_TEXTREL entry. */
3268 if ((info->flags & DF_TEXTREL) == 0)
3269 elf_link_hash_traverse (&htab->elf,
3270 elf_x86_64_readonly_dynrelocs,
3273 if ((info->flags & DF_TEXTREL) != 0)
3275 if (!add_dynamic_entry (DT_TEXTREL, 0))
3280 #undef add_dynamic_entry
3286 elf_x86_64_always_size_sections (bfd *output_bfd,
3287 struct bfd_link_info *info)
3289 asection *tls_sec = elf_hash_table (info)->tls_sec;
3293 struct elf_link_hash_entry *tlsbase;
3295 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3296 "_TLS_MODULE_BASE_",
3297 FALSE, FALSE, FALSE);
3299 if (tlsbase && tlsbase->type == STT_TLS)
3301 struct elf_x86_64_link_hash_table *htab;
3302 struct bfd_link_hash_entry *bh = NULL;
3303 const struct elf_backend_data *bed
3304 = get_elf_backend_data (output_bfd);
3306 htab = elf_x86_64_hash_table (info);
3310 if (!(_bfd_generic_link_add_one_symbol
3311 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3312 tls_sec, 0, NULL, FALSE,
3313 bed->collect, &bh)))
3316 htab->tls_module_base = bh;
3318 tlsbase = (struct elf_link_hash_entry *)bh;
3319 tlsbase->def_regular = 1;
3320 tlsbase->other = STV_HIDDEN;
3321 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3328 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3329 executables. Rather than setting it to the beginning of the TLS
3330 section, we have to set it to the end. This function may be called
3331 multiple times, it is idempotent. */
3334 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3336 struct elf_x86_64_link_hash_table *htab;
3337 struct bfd_link_hash_entry *base;
3339 if (!info->executable)
3342 htab = elf_x86_64_hash_table (info);
3346 base = htab->tls_module_base;
3350 base->u.def.value = htab->elf.tls_size;
3353 /* Return the base VMA address which should be subtracted from real addresses
3354 when resolving @dtpoff relocation.
3355 This is PT_TLS segment p_vaddr. */
3358 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3360 /* If tls_sec is NULL, we should have signalled an error already. */
3361 if (elf_hash_table (info)->tls_sec == NULL)
3363 return elf_hash_table (info)->tls_sec->vma;
3366 /* Return the relocation value for @tpoff relocation
3367 if STT_TLS virtual address is ADDRESS. */
3370 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3372 struct elf_link_hash_table *htab = elf_hash_table (info);
3373 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3374 bfd_vma static_tls_size;
3376 /* If tls_segment is NULL, we should have signalled an error already. */
3377 if (htab->tls_sec == NULL)
3380 /* Consider special static TLS alignment requirements. */
3381 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3382 return address - static_tls_size - htab->tls_sec->vma;
3385 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3389 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3391 /* Opcode Instruction
3394 0x0f 0x8x conditional jump */
3396 && (contents [offset - 1] == 0xe8
3397 || contents [offset - 1] == 0xe9))
3399 && contents [offset - 2] == 0x0f
3400 && (contents [offset - 1] & 0xf0) == 0x80));
3403 /* Relocate an x86_64 ELF section. */
3406 elf_x86_64_relocate_section (bfd *output_bfd,
3407 struct bfd_link_info *info,
3409 asection *input_section,
3411 Elf_Internal_Rela *relocs,
3412 Elf_Internal_Sym *local_syms,
3413 asection **local_sections)
3415 struct elf_x86_64_link_hash_table *htab;
3416 Elf_Internal_Shdr *symtab_hdr;
3417 struct elf_link_hash_entry **sym_hashes;
3418 bfd_vma *local_got_offsets;
3419 bfd_vma *local_tlsdesc_gotents;
3420 Elf_Internal_Rela *rel;
3421 Elf_Internal_Rela *relend;
3422 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3424 BFD_ASSERT (is_x86_64_elf (input_bfd));
3426 htab = elf_x86_64_hash_table (info);
3429 symtab_hdr = &elf_symtab_hdr (input_bfd);
3430 sym_hashes = elf_sym_hashes (input_bfd);
3431 local_got_offsets = elf_local_got_offsets (input_bfd);
3432 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3434 elf_x86_64_set_tls_module_base (info);
3437 relend = relocs + input_section->reloc_count;
3438 for (; rel < relend; rel++)
3440 unsigned int r_type;
3441 reloc_howto_type *howto;
3442 unsigned long r_symndx;
3443 struct elf_link_hash_entry *h;
3444 struct elf_x86_64_link_hash_entry *eh;
3445 Elf_Internal_Sym *sym;
3447 bfd_vma off, offplt, plt_offset;
3449 bfd_boolean unresolved_reloc;
3450 bfd_reloc_status_type r;
3452 asection *base_got, *resolved_plt;
3455 r_type = ELF32_R_TYPE (rel->r_info);
3456 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3457 || r_type == (int) R_X86_64_GNU_VTENTRY)
3460 if (r_type >= (int) R_X86_64_standard)
3462 (*_bfd_error_handler)
3463 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3464 input_bfd, input_section, r_type);
3465 bfd_set_error (bfd_error_bad_value);
3469 if (r_type != (int) R_X86_64_32
3470 || ABI_64_P (output_bfd))
3471 howto = x86_64_elf_howto_table + r_type;
3473 howto = (x86_64_elf_howto_table
3474 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3475 r_symndx = htab->r_sym (rel->r_info);
3479 unresolved_reloc = FALSE;
3480 if (r_symndx < symtab_hdr->sh_info)
3482 sym = local_syms + r_symndx;
3483 sec = local_sections[r_symndx];
3485 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3487 st_size = sym->st_size;
3489 /* Relocate against local STT_GNU_IFUNC symbol. */
3490 if (!info->relocatable
3491 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3493 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3498 /* Set STT_GNU_IFUNC symbol value. */
3499 h->root.u.def.value = sym->st_value;
3500 h->root.u.def.section = sec;
3505 bfd_boolean warned ATTRIBUTE_UNUSED;
3506 bfd_boolean ignored ATTRIBUTE_UNUSED;
3508 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3509 r_symndx, symtab_hdr, sym_hashes,
3511 unresolved_reloc, warned, ignored);
3515 if (sec != NULL && discarded_section (sec))
3516 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3517 rel, 1, relend, howto, 0, contents);
3519 if (info->relocatable)
3522 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3524 if (r_type == R_X86_64_64)
3526 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3527 zero-extend it to 64bit if addend is zero. */
3528 r_type = R_X86_64_32;
3529 memset (contents + rel->r_offset + 4, 0, 4);
3531 else if (r_type == R_X86_64_SIZE64)
3533 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3534 zero-extend it to 64bit if addend is zero. */
3535 r_type = R_X86_64_SIZE32;
3536 memset (contents + rel->r_offset + 4, 0, 4);
3540 eh = (struct elf_x86_64_link_hash_entry *) h;
3542 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3543 it here if it is defined in a non-shared object. */
3545 && h->type == STT_GNU_IFUNC
3551 if ((input_section->flags & SEC_ALLOC) == 0
3552 || h->plt.offset == (bfd_vma) -1)
3555 /* STT_GNU_IFUNC symbol must go through PLT. */
3556 if (htab->elf.splt != NULL)
3558 if (htab->plt_bnd != NULL)
3560 resolved_plt = htab->plt_bnd;
3561 plt_offset = eh->plt_bnd.offset;
3565 resolved_plt = htab->elf.splt;
3566 plt_offset = h->plt.offset;
3571 resolved_plt = htab->elf.iplt;
3572 plt_offset = h->plt.offset;
3575 relocation = (resolved_plt->output_section->vma
3576 + resolved_plt->output_offset + plt_offset);
3581 if (h->root.root.string)
3582 name = h->root.root.string;
3584 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3586 (*_bfd_error_handler)
3587 (_("%B: relocation %s against STT_GNU_IFUNC "
3588 "symbol `%s' isn't handled by %s"), input_bfd,
3589 x86_64_elf_howto_table[r_type].name,
3590 name, __FUNCTION__);
3591 bfd_set_error (bfd_error_bad_value);
3600 if (ABI_64_P (output_bfd))
3604 if (rel->r_addend != 0)
3606 if (h->root.root.string)
3607 name = h->root.root.string;
3609 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3611 (*_bfd_error_handler)
3612 (_("%B: relocation %s against STT_GNU_IFUNC "
3613 "symbol `%s' has non-zero addend: %d"),
3614 input_bfd, x86_64_elf_howto_table[r_type].name,
3615 name, rel->r_addend);
3616 bfd_set_error (bfd_error_bad_value);
3620 /* Generate dynamic relcoation only when there is a
3621 non-GOT reference in a shared object. */
3622 if (info->shared && h->non_got_ref)
3624 Elf_Internal_Rela outrel;
3627 /* Need a dynamic relocation to get the real function
3629 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3633 if (outrel.r_offset == (bfd_vma) -1
3634 || outrel.r_offset == (bfd_vma) -2)
3637 outrel.r_offset += (input_section->output_section->vma
3638 + input_section->output_offset);
3640 if (h->dynindx == -1
3642 || info->executable)
3644 /* This symbol is resolved locally. */
3645 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3646 outrel.r_addend = (h->root.u.def.value
3647 + h->root.u.def.section->output_section->vma
3648 + h->root.u.def.section->output_offset);
3652 outrel.r_info = htab->r_info (h->dynindx, r_type);
3653 outrel.r_addend = 0;
3656 sreloc = htab->elf.irelifunc;
3657 elf_append_rela (output_bfd, sreloc, &outrel);
3659 /* If this reloc is against an external symbol, we
3660 do not want to fiddle with the addend. Otherwise,
3661 we need to include the symbol value so that it
3662 becomes an addend for the dynamic reloc. For an
3663 internal symbol, we have updated addend. */
3668 case R_X86_64_PC32_BND:
3670 case R_X86_64_PLT32:
3671 case R_X86_64_PLT32_BND:
3674 case R_X86_64_GOTPCREL:
3675 case R_X86_64_GOTPCREL64:
3676 base_got = htab->elf.sgot;
3677 off = h->got.offset;
3679 if (base_got == NULL)
3682 if (off == (bfd_vma) -1)
3684 /* We can't use h->got.offset here to save state, or
3685 even just remember the offset, as finish_dynamic_symbol
3686 would use that as offset into .got. */
3688 if (htab->elf.splt != NULL)
3690 plt_index = h->plt.offset / plt_entry_size - 1;
3691 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3692 base_got = htab->elf.sgotplt;
3696 plt_index = h->plt.offset / plt_entry_size;
3697 off = plt_index * GOT_ENTRY_SIZE;
3698 base_got = htab->elf.igotplt;
3701 if (h->dynindx == -1
3705 /* This references the local defitionion. We must
3706 initialize this entry in the global offset table.
3707 Since the offset must always be a multiple of 8,
3708 we use the least significant bit to record
3709 whether we have initialized it already.
3711 When doing a dynamic link, we create a .rela.got
3712 relocation entry to initialize the value. This
3713 is done in the finish_dynamic_symbol routine. */
3718 bfd_put_64 (output_bfd, relocation,
3719 base_got->contents + off);
3720 /* Note that this is harmless for the GOTPLT64
3721 case, as -1 | 1 still is -1. */
3727 relocation = (base_got->output_section->vma
3728 + base_got->output_offset + off);
3734 /* When generating a shared object, the relocations handled here are
3735 copied into the output file to be resolved at run time. */
3738 case R_X86_64_GOT32:
3739 case R_X86_64_GOT64:
3740 /* Relocation is to the entry for this symbol in the global
3742 case R_X86_64_GOTPCREL:
3743 case R_X86_64_GOTPCREL64:
3744 /* Use global offset table entry as symbol value. */
3745 case R_X86_64_GOTPLT64:
3746 /* This is the same as GOT64 for relocation purposes, but
3747 indicates the existence of a PLT entry. The difficulty is,
3748 that we must calculate the GOT slot offset from the PLT
3749 offset, if this symbol got a PLT entry (it was global).
3750 Additionally if it's computed from the PLT entry, then that
3751 GOT offset is relative to .got.plt, not to .got. */
3752 base_got = htab->elf.sgot;
3754 if (htab->elf.sgot == NULL)
3761 off = h->got.offset;
3763 && h->plt.offset != (bfd_vma)-1
3764 && off == (bfd_vma)-1)
3766 /* We can't use h->got.offset here to save
3767 state, or even just remember the offset, as
3768 finish_dynamic_symbol would use that as offset into
3770 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3771 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3772 base_got = htab->elf.sgotplt;
3775 dyn = htab->elf.dynamic_sections_created;
3777 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3779 && SYMBOL_REFERENCES_LOCAL (info, h))
3780 || (ELF_ST_VISIBILITY (h->other)
3781 && h->root.type == bfd_link_hash_undefweak))
3783 /* This is actually a static link, or it is a -Bsymbolic
3784 link and the symbol is defined locally, or the symbol
3785 was forced to be local because of a version file. We
3786 must initialize this entry in the global offset table.
3787 Since the offset must always be a multiple of 8, we
3788 use the least significant bit to record whether we
3789 have initialized it already.
3791 When doing a dynamic link, we create a .rela.got
3792 relocation entry to initialize the value. This is
3793 done in the finish_dynamic_symbol routine. */
3798 bfd_put_64 (output_bfd, relocation,
3799 base_got->contents + off);
3800 /* Note that this is harmless for the GOTPLT64 case,
3801 as -1 | 1 still is -1. */
3806 unresolved_reloc = FALSE;
3810 if (local_got_offsets == NULL)
3813 off = local_got_offsets[r_symndx];
3815 /* The offset must always be a multiple of 8. We use
3816 the least significant bit to record whether we have
3817 already generated the necessary reloc. */
3822 bfd_put_64 (output_bfd, relocation,
3823 base_got->contents + off);
3828 Elf_Internal_Rela outrel;
3830 /* We need to generate a R_X86_64_RELATIVE reloc
3831 for the dynamic linker. */
3832 s = htab->elf.srelgot;
3836 outrel.r_offset = (base_got->output_section->vma
3837 + base_got->output_offset
3839 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3840 outrel.r_addend = relocation;
3841 elf_append_rela (output_bfd, s, &outrel);
3844 local_got_offsets[r_symndx] |= 1;
3848 if (off >= (bfd_vma) -2)
3851 relocation = base_got->output_section->vma
3852 + base_got->output_offset + off;
3853 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3854 relocation -= htab->elf.sgotplt->output_section->vma
3855 - htab->elf.sgotplt->output_offset;
3859 case R_X86_64_GOTOFF64:
3860 /* Relocation is relative to the start of the global offset
3863 /* Check to make sure it isn't a protected function symbol
3864 for shared library since it may not be local when used
3865 as function address. */
3866 if (!info->executable
3868 && !SYMBOLIC_BIND (info, h)
3870 && h->type == STT_FUNC
3871 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3873 (*_bfd_error_handler)
3874 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3875 input_bfd, h->root.root.string);
3876 bfd_set_error (bfd_error_bad_value);
3880 /* Note that sgot is not involved in this
3881 calculation. We always want the start of .got.plt. If we
3882 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3883 permitted by the ABI, we might have to change this
3885 relocation -= htab->elf.sgotplt->output_section->vma
3886 + htab->elf.sgotplt->output_offset;
3889 case R_X86_64_GOTPC32:
3890 case R_X86_64_GOTPC64:
3891 /* Use global offset table as symbol value. */
3892 relocation = htab->elf.sgotplt->output_section->vma
3893 + htab->elf.sgotplt->output_offset;
3894 unresolved_reloc = FALSE;
3897 case R_X86_64_PLTOFF64:
3898 /* Relocation is PLT entry relative to GOT. For local
3899 symbols it's the symbol itself relative to GOT. */
3901 /* See PLT32 handling. */
3902 && h->plt.offset != (bfd_vma) -1
3903 && htab->elf.splt != NULL)
3905 if (htab->plt_bnd != NULL)
3907 resolved_plt = htab->plt_bnd;
3908 plt_offset = eh->plt_bnd.offset;
3912 resolved_plt = htab->elf.splt;
3913 plt_offset = h->plt.offset;
3916 relocation = (resolved_plt->output_section->vma
3917 + resolved_plt->output_offset
3919 unresolved_reloc = FALSE;
3922 relocation -= htab->elf.sgotplt->output_section->vma
3923 + htab->elf.sgotplt->output_offset;
3926 case R_X86_64_PLT32:
3927 case R_X86_64_PLT32_BND:
3928 /* Relocation is to the entry for this symbol in the
3929 procedure linkage table. */
3931 /* Resolve a PLT32 reloc against a local symbol directly,
3932 without using the procedure linkage table. */
3936 if (h->plt.offset == (bfd_vma) -1
3937 || htab->elf.splt == NULL)
3939 /* We didn't make a PLT entry for this symbol. This
3940 happens when statically linking PIC code, or when
3941 using -Bsymbolic. */
3945 if (htab->plt_bnd != NULL)
3947 resolved_plt = htab->plt_bnd;
3948 plt_offset = eh->plt_bnd.offset;
3952 resolved_plt = htab->elf.splt;
3953 plt_offset = h->plt.offset;
3956 relocation = (resolved_plt->output_section->vma
3957 + resolved_plt->output_offset
3959 unresolved_reloc = FALSE;
3962 case R_X86_64_SIZE32:
3963 case R_X86_64_SIZE64:
3964 /* Set to symbol size. */
3965 relocation = st_size;
3971 case R_X86_64_PC32_BND:
3973 && (input_section->flags & SEC_ALLOC) != 0
3974 && (input_section->flags & SEC_READONLY) != 0
3977 bfd_boolean fail = FALSE;
3979 = ((r_type == R_X86_64_PC32
3980 || r_type == R_X86_64_PC32_BND)
3981 && is_32bit_relative_branch (contents, rel->r_offset));
3983 if (SYMBOL_REFERENCES_LOCAL (info, h))
3985 /* Symbol is referenced locally. Make sure it is
3986 defined locally or for a branch. */
3987 fail = !h->def_regular && !branch;
3989 else if (!(info->executable && h->needs_copy))
3991 /* Symbol doesn't need copy reloc and isn't referenced
3992 locally. We only allow branch to symbol with
3993 non-default visibility. */
3995 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4002 const char *pic = "";
4004 switch (ELF_ST_VISIBILITY (h->other))
4007 v = _("hidden symbol");
4010 v = _("internal symbol");
4013 v = _("protected symbol");
4017 pic = _("; recompile with -fPIC");
4022 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4024 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4026 (*_bfd_error_handler) (fmt, input_bfd,
4027 x86_64_elf_howto_table[r_type].name,
4028 v, h->root.root.string, pic);
4029 bfd_set_error (bfd_error_bad_value);
4040 /* FIXME: The ABI says the linker should make sure the value is
4041 the same when it's zeroextended to 64 bit. */
4044 if ((input_section->flags & SEC_ALLOC) == 0)
4047 /* Don't copy a pc-relative relocation into the output file
4048 if the symbol needs copy reloc. */
4050 && !(info->executable
4053 && IS_X86_64_PCREL_TYPE (r_type))
4055 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4056 || h->root.type != bfd_link_hash_undefweak)
4057 && ((! IS_X86_64_PCREL_TYPE (r_type)
4058 && r_type != R_X86_64_SIZE32
4059 && r_type != R_X86_64_SIZE64)
4060 || ! SYMBOL_CALLS_LOCAL (info, h)))
4061 || (ELIMINATE_COPY_RELOCS
4068 || h->root.type == bfd_link_hash_undefweak
4069 || h->root.type == bfd_link_hash_undefined)))
4071 Elf_Internal_Rela outrel;
4072 bfd_boolean skip, relocate;
4075 /* When generating a shared object, these relocations
4076 are copied into the output file to be resolved at run
4082 _bfd_elf_section_offset (output_bfd, info, input_section,
4084 if (outrel.r_offset == (bfd_vma) -1)
4086 else if (outrel.r_offset == (bfd_vma) -2)
4087 skip = TRUE, relocate = TRUE;
4089 outrel.r_offset += (input_section->output_section->vma
4090 + input_section->output_offset);
4093 memset (&outrel, 0, sizeof outrel);
4095 /* h->dynindx may be -1 if this symbol was marked to
4099 && (IS_X86_64_PCREL_TYPE (r_type)
4101 || ! SYMBOLIC_BIND (info, h)
4102 || ! h->def_regular))
4104 outrel.r_info = htab->r_info (h->dynindx, r_type);
4105 outrel.r_addend = rel->r_addend;
4109 /* This symbol is local, or marked to become local. */
4110 if (r_type == htab->pointer_r_type)
4113 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4114 outrel.r_addend = relocation + rel->r_addend;
4116 else if (r_type == R_X86_64_64
4117 && !ABI_64_P (output_bfd))
4120 outrel.r_info = htab->r_info (0,
4121 R_X86_64_RELATIVE64);
4122 outrel.r_addend = relocation + rel->r_addend;
4123 /* Check addend overflow. */
4124 if ((outrel.r_addend & 0x80000000)
4125 != (rel->r_addend & 0x80000000))
4128 int addend = rel->r_addend;
4129 if (h && h->root.root.string)
4130 name = h->root.root.string;
4132 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4135 (*_bfd_error_handler)
4136 (_("%B: addend -0x%x in relocation %s against "
4137 "symbol `%s' at 0x%lx in section `%A' is "
4139 input_bfd, input_section, addend,
4140 x86_64_elf_howto_table[r_type].name,
4141 name, (unsigned long) rel->r_offset);
4143 (*_bfd_error_handler)
4144 (_("%B: addend 0x%x in relocation %s against "
4145 "symbol `%s' at 0x%lx in section `%A' is "
4147 input_bfd, input_section, addend,
4148 x86_64_elf_howto_table[r_type].name,
4149 name, (unsigned long) rel->r_offset);
4150 bfd_set_error (bfd_error_bad_value);
4158 if (bfd_is_abs_section (sec))
4160 else if (sec == NULL || sec->owner == NULL)
4162 bfd_set_error (bfd_error_bad_value);
4169 /* We are turning this relocation into one
4170 against a section symbol. It would be
4171 proper to subtract the symbol's value,
4172 osec->vma, from the emitted reloc addend,
4173 but ld.so expects buggy relocs. */
4174 osec = sec->output_section;
4175 sindx = elf_section_data (osec)->dynindx;
4178 asection *oi = htab->elf.text_index_section;
4179 sindx = elf_section_data (oi)->dynindx;
4181 BFD_ASSERT (sindx != 0);
4184 outrel.r_info = htab->r_info (sindx, r_type);
4185 outrel.r_addend = relocation + rel->r_addend;
4189 sreloc = elf_section_data (input_section)->sreloc;
4191 if (sreloc == NULL || sreloc->contents == NULL)
4193 r = bfd_reloc_notsupported;
4194 goto check_relocation_error;
4197 elf_append_rela (output_bfd, sreloc, &outrel);
4199 /* If this reloc is against an external symbol, we do
4200 not want to fiddle with the addend. Otherwise, we
4201 need to include the symbol value so that it becomes
4202 an addend for the dynamic reloc. */
4209 case R_X86_64_TLSGD:
4210 case R_X86_64_GOTPC32_TLSDESC:
4211 case R_X86_64_TLSDESC_CALL:
4212 case R_X86_64_GOTTPOFF:
4213 tls_type = GOT_UNKNOWN;
4214 if (h == NULL && local_got_offsets)
4215 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4217 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4219 if (! elf_x86_64_tls_transition (info, input_bfd,
4220 input_section, contents,
4221 symtab_hdr, sym_hashes,
4222 &r_type, tls_type, rel,
4223 relend, h, r_symndx))
4226 if (r_type == R_X86_64_TPOFF32)
4228 bfd_vma roff = rel->r_offset;
4230 BFD_ASSERT (! unresolved_reloc);
4232 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4234 /* GD->LE transition. For 64bit, change
4235 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4236 .word 0x6666; rex64; call __tls_get_addr
4239 leaq foo@tpoff(%rax), %rax
4241 leaq foo@tlsgd(%rip), %rdi
4242 .word 0x6666; rex64; call __tls_get_addr
4245 leaq foo@tpoff(%rax), %rax
4246 For largepic, change:
4247 leaq foo@tlsgd(%rip), %rdi
4248 movabsq $__tls_get_addr@pltoff, %rax
4253 leaq foo@tpoff(%rax), %rax
4254 nopw 0x0(%rax,%rax,1) */
4256 if (ABI_64_P (output_bfd)
4257 && contents[roff + 5] == (bfd_byte) '\xb8')
4259 memcpy (contents + roff - 3,
4260 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4261 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4264 else if (ABI_64_P (output_bfd))
4265 memcpy (contents + roff - 4,
4266 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4269 memcpy (contents + roff - 3,
4270 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4272 bfd_put_32 (output_bfd,
4273 elf_x86_64_tpoff (info, relocation),
4274 contents + roff + 8 + largepic);
4275 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4279 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4281 /* GDesc -> LE transition.
4282 It's originally something like:
4283 leaq x@tlsdesc(%rip), %rax
4286 movl $x@tpoff, %rax. */
4288 unsigned int val, type;
4290 type = bfd_get_8 (input_bfd, contents + roff - 3);
4291 val = bfd_get_8 (input_bfd, contents + roff - 1);
4292 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4293 contents + roff - 3);
4294 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4295 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4296 contents + roff - 1);
4297 bfd_put_32 (output_bfd,
4298 elf_x86_64_tpoff (info, relocation),
4302 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4304 /* GDesc -> LE transition.
4309 bfd_put_8 (output_bfd, 0x66, contents + roff);
4310 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4313 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4315 /* IE->LE transition:
4316 For 64bit, originally it can be one of:
4317 movq foo@gottpoff(%rip), %reg
4318 addq foo@gottpoff(%rip), %reg
4321 leaq foo(%reg), %reg
4323 For 32bit, originally it can be one of:
4324 movq foo@gottpoff(%rip), %reg
4325 addl foo@gottpoff(%rip), %reg
4328 leal foo(%reg), %reg
4331 unsigned int val, type, reg;
4334 val = bfd_get_8 (input_bfd, contents + roff - 3);
4337 type = bfd_get_8 (input_bfd, contents + roff - 2);
4338 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4344 bfd_put_8 (output_bfd, 0x49,
4345 contents + roff - 3);
4346 else if (!ABI_64_P (output_bfd) && val == 0x44)
4347 bfd_put_8 (output_bfd, 0x41,
4348 contents + roff - 3);
4349 bfd_put_8 (output_bfd, 0xc7,
4350 contents + roff - 2);
4351 bfd_put_8 (output_bfd, 0xc0 | reg,
4352 contents + roff - 1);
4356 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4359 bfd_put_8 (output_bfd, 0x49,
4360 contents + roff - 3);
4361 else if (!ABI_64_P (output_bfd) && val == 0x44)
4362 bfd_put_8 (output_bfd, 0x41,
4363 contents + roff - 3);
4364 bfd_put_8 (output_bfd, 0x81,
4365 contents + roff - 2);
4366 bfd_put_8 (output_bfd, 0xc0 | reg,
4367 contents + roff - 1);
4371 /* addq/addl -> leaq/leal */
4373 bfd_put_8 (output_bfd, 0x4d,
4374 contents + roff - 3);
4375 else if (!ABI_64_P (output_bfd) && val == 0x44)
4376 bfd_put_8 (output_bfd, 0x45,
4377 contents + roff - 3);
4378 bfd_put_8 (output_bfd, 0x8d,
4379 contents + roff - 2);
4380 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4381 contents + roff - 1);
4383 bfd_put_32 (output_bfd,
4384 elf_x86_64_tpoff (info, relocation),
4392 if (htab->elf.sgot == NULL)
4397 off = h->got.offset;
4398 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4402 if (local_got_offsets == NULL)
4405 off = local_got_offsets[r_symndx];
4406 offplt = local_tlsdesc_gotents[r_symndx];
4413 Elf_Internal_Rela outrel;
4417 if (htab->elf.srelgot == NULL)
4420 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4422 if (GOT_TLS_GDESC_P (tls_type))
4424 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4425 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4426 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4427 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4428 + htab->elf.sgotplt->output_offset
4430 + htab->sgotplt_jump_table_size);
4431 sreloc = htab->elf.srelplt;
4433 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4435 outrel.r_addend = 0;
4436 elf_append_rela (output_bfd, sreloc, &outrel);
4439 sreloc = htab->elf.srelgot;
4441 outrel.r_offset = (htab->elf.sgot->output_section->vma
4442 + htab->elf.sgot->output_offset + off);
4444 if (GOT_TLS_GD_P (tls_type))
4445 dr_type = R_X86_64_DTPMOD64;
4446 else if (GOT_TLS_GDESC_P (tls_type))
4449 dr_type = R_X86_64_TPOFF64;
4451 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4452 outrel.r_addend = 0;
4453 if ((dr_type == R_X86_64_TPOFF64
4454 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4455 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4456 outrel.r_info = htab->r_info (indx, dr_type);
4458 elf_append_rela (output_bfd, sreloc, &outrel);
4460 if (GOT_TLS_GD_P (tls_type))
4464 BFD_ASSERT (! unresolved_reloc);
4465 bfd_put_64 (output_bfd,
4466 relocation - elf_x86_64_dtpoff_base (info),
4467 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4471 bfd_put_64 (output_bfd, 0,
4472 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4473 outrel.r_info = htab->r_info (indx,
4475 outrel.r_offset += GOT_ENTRY_SIZE;
4476 elf_append_rela (output_bfd, sreloc,
4485 local_got_offsets[r_symndx] |= 1;
4488 if (off >= (bfd_vma) -2
4489 && ! GOT_TLS_GDESC_P (tls_type))
4491 if (r_type == ELF32_R_TYPE (rel->r_info))
4493 if (r_type == R_X86_64_GOTPC32_TLSDESC
4494 || r_type == R_X86_64_TLSDESC_CALL)
4495 relocation = htab->elf.sgotplt->output_section->vma
4496 + htab->elf.sgotplt->output_offset
4497 + offplt + htab->sgotplt_jump_table_size;
4499 relocation = htab->elf.sgot->output_section->vma
4500 + htab->elf.sgot->output_offset + off;
4501 unresolved_reloc = FALSE;
4505 bfd_vma roff = rel->r_offset;
4507 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4509 /* GD->IE transition. For 64bit, change
4510 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4511 .word 0x6666; rex64; call __tls_get_addr@plt
4514 addq foo@gottpoff(%rip), %rax
4516 leaq foo@tlsgd(%rip), %rdi
4517 .word 0x6666; rex64; call __tls_get_addr@plt
4520 addq foo@gottpoff(%rip), %rax
4521 For largepic, change:
4522 leaq foo@tlsgd(%rip), %rdi
4523 movabsq $__tls_get_addr@pltoff, %rax
4528 addq foo@gottpoff(%rax), %rax
4529 nopw 0x0(%rax,%rax,1) */
4531 if (ABI_64_P (output_bfd)
4532 && contents[roff + 5] == (bfd_byte) '\xb8')
4534 memcpy (contents + roff - 3,
4535 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4536 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4539 else if (ABI_64_P (output_bfd))
4540 memcpy (contents + roff - 4,
4541 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4544 memcpy (contents + roff - 3,
4545 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4548 relocation = (htab->elf.sgot->output_section->vma
4549 + htab->elf.sgot->output_offset + off
4552 - input_section->output_section->vma
4553 - input_section->output_offset
4555 bfd_put_32 (output_bfd, relocation,
4556 contents + roff + 8 + largepic);
4557 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4561 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4563 /* GDesc -> IE transition.
4564 It's originally something like:
4565 leaq x@tlsdesc(%rip), %rax
4568 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4570 /* Now modify the instruction as appropriate. To
4571 turn a leaq into a movq in the form we use it, it
4572 suffices to change the second byte from 0x8d to
4574 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4576 bfd_put_32 (output_bfd,
4577 htab->elf.sgot->output_section->vma
4578 + htab->elf.sgot->output_offset + off
4580 - input_section->output_section->vma
4581 - input_section->output_offset
4586 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4588 /* GDesc -> IE transition.
4595 bfd_put_8 (output_bfd, 0x66, contents + roff);
4596 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4604 case R_X86_64_TLSLD:
4605 if (! elf_x86_64_tls_transition (info, input_bfd,
4606 input_section, contents,
4607 symtab_hdr, sym_hashes,
4608 &r_type, GOT_UNKNOWN,
4609 rel, relend, h, r_symndx))
4612 if (r_type != R_X86_64_TLSLD)
4614 /* LD->LE transition:
4615 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4616 For 64bit, we change it into:
4617 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4618 For 32bit, we change it into:
4619 nopl 0x0(%rax); movl %fs:0, %eax.
4620 For largepic, change:
4621 leaq foo@tlsgd(%rip), %rdi
4622 movabsq $__tls_get_addr@pltoff, %rax
4626 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4629 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4630 if (ABI_64_P (output_bfd)
4631 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
4632 memcpy (contents + rel->r_offset - 3,
4633 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4634 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4635 else if (ABI_64_P (output_bfd))
4636 memcpy (contents + rel->r_offset - 3,
4637 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4639 memcpy (contents + rel->r_offset - 3,
4640 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4641 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4646 if (htab->elf.sgot == NULL)
4649 off = htab->tls_ld_got.offset;
4654 Elf_Internal_Rela outrel;
4656 if (htab->elf.srelgot == NULL)
4659 outrel.r_offset = (htab->elf.sgot->output_section->vma
4660 + htab->elf.sgot->output_offset + off);
4662 bfd_put_64 (output_bfd, 0,
4663 htab->elf.sgot->contents + off);
4664 bfd_put_64 (output_bfd, 0,
4665 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4666 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4667 outrel.r_addend = 0;
4668 elf_append_rela (output_bfd, htab->elf.srelgot,
4670 htab->tls_ld_got.offset |= 1;
4672 relocation = htab->elf.sgot->output_section->vma
4673 + htab->elf.sgot->output_offset + off;
4674 unresolved_reloc = FALSE;
4677 case R_X86_64_DTPOFF32:
4678 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4679 relocation -= elf_x86_64_dtpoff_base (info);
4681 relocation = elf_x86_64_tpoff (info, relocation);
4684 case R_X86_64_TPOFF32:
4685 case R_X86_64_TPOFF64:
4686 BFD_ASSERT (info->executable);
4687 relocation = elf_x86_64_tpoff (info, relocation);
4690 case R_X86_64_DTPOFF64:
4691 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4692 relocation -= elf_x86_64_dtpoff_base (info);
4699 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4700 because such sections are not SEC_ALLOC and thus ld.so will
4701 not process them. */
4702 if (unresolved_reloc
4703 && !((input_section->flags & SEC_DEBUGGING) != 0
4705 && _bfd_elf_section_offset (output_bfd, info, input_section,
4706 rel->r_offset) != (bfd_vma) -1)
4708 (*_bfd_error_handler)
4709 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4712 (long) rel->r_offset,
4714 h->root.root.string);
4719 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4720 contents, rel->r_offset,
4721 relocation, rel->r_addend);
4723 check_relocation_error:
4724 if (r != bfd_reloc_ok)
4729 name = h->root.root.string;
4732 name = bfd_elf_string_from_elf_section (input_bfd,
4733 symtab_hdr->sh_link,
4738 name = bfd_section_name (input_bfd, sec);
4741 if (r == bfd_reloc_overflow)
4743 if (! ((*info->callbacks->reloc_overflow)
4744 (info, (h ? &h->root : NULL), name, howto->name,
4745 (bfd_vma) 0, input_bfd, input_section,
4751 (*_bfd_error_handler)
4752 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4753 input_bfd, input_section,
4754 (long) rel->r_offset, name, (int) r);
4763 /* Finish up dynamic symbol handling. We set the contents of various
4764 dynamic sections here. */
4767 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4768 struct bfd_link_info *info,
4769 struct elf_link_hash_entry *h,
4770 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4772 struct elf_x86_64_link_hash_table *htab;
4773 const struct elf_x86_64_backend_data *abed;
4774 bfd_boolean use_plt_bnd;
4776 htab = elf_x86_64_hash_table (info);
4780 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
4781 section only if there is .plt section. */
4782 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
4784 ? &elf_x86_64_bnd_arch_bed
4785 : get_elf_x86_64_backend_data (output_bfd));
4787 if (h->plt.offset != (bfd_vma) -1)
4790 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
4791 bfd_vma plt_plt_insn_end, plt_got_insn_size;
4792 Elf_Internal_Rela rela;
4794 asection *plt, *gotplt, *relplt, *resolved_plt;
4795 const struct elf_backend_data *bed;
4797 /* When building a static executable, use .iplt, .igot.plt and
4798 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4799 if (htab->elf.splt != NULL)
4801 plt = htab->elf.splt;
4802 gotplt = htab->elf.sgotplt;
4803 relplt = htab->elf.srelplt;
4807 plt = htab->elf.iplt;
4808 gotplt = htab->elf.igotplt;
4809 relplt = htab->elf.irelplt;
4812 /* This symbol has an entry in the procedure linkage table. Set
4814 if ((h->dynindx == -1
4815 && !((h->forced_local || info->executable)
4817 && h->type == STT_GNU_IFUNC))
4823 /* Get the index in the procedure linkage table which
4824 corresponds to this symbol. This is the index of this symbol
4825 in all the symbols for which we are making plt entries. The
4826 first entry in the procedure linkage table is reserved.
4828 Get the offset into the .got table of the entry that
4829 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4830 bytes. The first three are reserved for the dynamic linker.
4832 For static executables, we don't reserve anything. */
4834 if (plt == htab->elf.splt)
4836 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4837 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4841 got_offset = h->plt.offset / abed->plt_entry_size;
4842 got_offset = got_offset * GOT_ENTRY_SIZE;
4845 plt_plt_insn_end = abed->plt_plt_insn_end;
4846 plt_plt_offset = abed->plt_plt_offset;
4847 plt_got_insn_size = abed->plt_got_insn_size;
4848 plt_got_offset = abed->plt_got_offset;
4851 /* Use the second PLT with BND relocations. */
4852 const bfd_byte *plt_entry, *plt2_entry;
4853 struct elf_x86_64_link_hash_entry *eh
4854 = (struct elf_x86_64_link_hash_entry *) h;
4856 if (eh->has_bnd_reloc)
4858 plt_entry = elf_x86_64_bnd_plt_entry;
4859 plt2_entry = elf_x86_64_bnd_plt2_entry;
4863 plt_entry = elf_x86_64_legacy_plt_entry;
4864 plt2_entry = elf_x86_64_legacy_plt2_entry;
4866 /* Subtract 1 since there is no BND prefix. */
4867 plt_plt_insn_end -= 1;
4868 plt_plt_offset -= 1;
4869 plt_got_insn_size -= 1;
4870 plt_got_offset -= 1;
4873 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
4874 == sizeof (elf_x86_64_legacy_plt_entry));
4876 /* Fill in the entry in the procedure linkage table. */
4877 memcpy (plt->contents + h->plt.offset,
4878 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
4879 /* Fill in the entry in the second PLT. */
4880 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
4881 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
4883 resolved_plt = htab->plt_bnd;
4884 plt_offset = eh->plt_bnd.offset;
4888 /* Fill in the entry in the procedure linkage table. */
4889 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4890 abed->plt_entry_size);
4893 plt_offset = h->plt.offset;
4896 /* Insert the relocation positions of the plt section. */
4898 /* Put offset the PC-relative instruction referring to the GOT entry,
4899 subtracting the size of that instruction. */
4900 bfd_put_32 (output_bfd,
4901 (gotplt->output_section->vma
4902 + gotplt->output_offset
4904 - resolved_plt->output_section->vma
4905 - resolved_plt->output_offset
4907 - plt_got_insn_size),
4908 resolved_plt->contents + plt_offset + plt_got_offset);
4910 /* Fill in the entry in the global offset table, initially this
4911 points to the second part of the PLT entry. */
4912 bfd_put_64 (output_bfd, (plt->output_section->vma
4913 + plt->output_offset
4914 + h->plt.offset + abed->plt_lazy_offset),
4915 gotplt->contents + got_offset);
4917 /* Fill in the entry in the .rela.plt section. */
4918 rela.r_offset = (gotplt->output_section->vma
4919 + gotplt->output_offset
4921 if (h->dynindx == -1
4922 || ((info->executable
4923 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4925 && h->type == STT_GNU_IFUNC))
4927 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4928 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4929 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4930 rela.r_addend = (h->root.u.def.value
4931 + h->root.u.def.section->output_section->vma
4932 + h->root.u.def.section->output_offset);
4933 /* R_X86_64_IRELATIVE comes last. */
4934 plt_index = htab->next_irelative_index--;
4938 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
4940 plt_index = htab->next_jump_slot_index++;
4943 /* Don't fill PLT entry for static executables. */
4944 if (plt == htab->elf.splt)
4946 /* Put relocation index. */
4947 bfd_put_32 (output_bfd, plt_index,
4948 plt->contents + h->plt.offset + abed->plt_reloc_offset);
4949 /* Put offset for jmp .PLT0. */
4950 bfd_put_32 (output_bfd, - (h->plt.offset + plt_plt_insn_end),
4951 plt->contents + h->plt.offset + plt_plt_offset);
4954 bed = get_elf_backend_data (output_bfd);
4955 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
4956 bed->s->swap_reloca_out (output_bfd, &rela, loc);
4958 if (!h->def_regular)
4960 /* Mark the symbol as undefined, rather than as defined in
4961 the .plt section. Leave the value if there were any
4962 relocations where pointer equality matters (this is a clue
4963 for the dynamic linker, to make function pointer
4964 comparisons work between an application and shared
4965 library), otherwise set it to zero. If a function is only
4966 called from a binary, there is no need to slow down
4967 shared libraries because of that. */
4968 sym->st_shndx = SHN_UNDEF;
4969 if (!h->pointer_equality_needed)
4974 if (h->got.offset != (bfd_vma) -1
4975 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
4976 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
4978 Elf_Internal_Rela rela;
4980 /* This symbol has an entry in the global offset table. Set it
4982 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4985 rela.r_offset = (htab->elf.sgot->output_section->vma
4986 + htab->elf.sgot->output_offset
4987 + (h->got.offset &~ (bfd_vma) 1));
4989 /* If this is a static link, or it is a -Bsymbolic link and the
4990 symbol is defined locally or was forced to be local because
4991 of a version file, we just want to emit a RELATIVE reloc.
4992 The entry in the global offset table will already have been
4993 initialized in the relocate_section function. */
4995 && h->type == STT_GNU_IFUNC)
4999 /* Generate R_X86_64_GLOB_DAT. */
5006 if (!h->pointer_equality_needed)
5009 /* For non-shared object, we can't use .got.plt, which
5010 contains the real function addres if we need pointer
5011 equality. We load the GOT entry with the PLT entry. */
5012 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5013 bfd_put_64 (output_bfd, (plt->output_section->vma
5014 + plt->output_offset
5016 htab->elf.sgot->contents + h->got.offset);
5020 else if (info->shared
5021 && SYMBOL_REFERENCES_LOCAL (info, h))
5023 if (!h->def_regular)
5025 BFD_ASSERT((h->got.offset & 1) != 0);
5026 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5027 rela.r_addend = (h->root.u.def.value
5028 + h->root.u.def.section->output_section->vma
5029 + h->root.u.def.section->output_offset);
5033 BFD_ASSERT((h->got.offset & 1) == 0);
5035 bfd_put_64 (output_bfd, (bfd_vma) 0,
5036 htab->elf.sgot->contents + h->got.offset);
5037 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5041 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5046 Elf_Internal_Rela rela;
5048 /* This symbol needs a copy reloc. Set it up. */
5050 if (h->dynindx == -1
5051 || (h->root.type != bfd_link_hash_defined
5052 && h->root.type != bfd_link_hash_defweak)
5053 || htab->srelbss == NULL)
5056 rela.r_offset = (h->root.u.def.value
5057 + h->root.u.def.section->output_section->vma
5058 + h->root.u.def.section->output_offset);
5059 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5061 elf_append_rela (output_bfd, htab->srelbss, &rela);
5067 /* Finish up local dynamic symbol handling. We set the contents of
5068 various dynamic sections here. */
5071 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5073 struct elf_link_hash_entry *h
5074 = (struct elf_link_hash_entry *) *slot;
5075 struct bfd_link_info *info
5076 = (struct bfd_link_info *) inf;
5078 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5082 /* Used to decide how to sort relocs in an optimal manner for the
5083 dynamic linker, before writing them out. */
5085 static enum elf_reloc_type_class
5086 elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
5087 const asection *rel_sec ATTRIBUTE_UNUSED,
5088 const Elf_Internal_Rela *rela)
5090 switch ((int) ELF32_R_TYPE (rela->r_info))
5092 case R_X86_64_RELATIVE:
5093 case R_X86_64_RELATIVE64:
5094 return reloc_class_relative;
5095 case R_X86_64_JUMP_SLOT:
5096 return reloc_class_plt;
5098 return reloc_class_copy;
5100 return reloc_class_normal;
5104 /* Finish up the dynamic sections. */
5107 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5108 struct bfd_link_info *info)
5110 struct elf_x86_64_link_hash_table *htab;
5113 const struct elf_x86_64_backend_data *abed;
5115 htab = elf_x86_64_hash_table (info);
5119 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5120 section only if there is .plt section. */
5121 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5122 ? &elf_x86_64_bnd_arch_bed
5123 : get_elf_x86_64_backend_data (output_bfd));
5125 dynobj = htab->elf.dynobj;
5126 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5128 if (htab->elf.dynamic_sections_created)
5130 bfd_byte *dyncon, *dynconend;
5131 const struct elf_backend_data *bed;
5132 bfd_size_type sizeof_dyn;
5134 if (sdyn == NULL || htab->elf.sgot == NULL)
5137 bed = get_elf_backend_data (dynobj);
5138 sizeof_dyn = bed->s->sizeof_dyn;
5139 dyncon = sdyn->contents;
5140 dynconend = sdyn->contents + sdyn->size;
5141 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5143 Elf_Internal_Dyn dyn;
5146 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5154 s = htab->elf.sgotplt;
5155 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5159 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5163 s = htab->elf.srelplt->output_section;
5164 dyn.d_un.d_val = s->size;
5168 /* The procedure linkage table relocs (DT_JMPREL) should
5169 not be included in the overall relocs (DT_RELA).
5170 Therefore, we override the DT_RELASZ entry here to
5171 make it not include the JMPREL relocs. Since the
5172 linker script arranges for .rela.plt to follow all
5173 other relocation sections, we don't have to worry
5174 about changing the DT_RELA entry. */
5175 if (htab->elf.srelplt != NULL)
5177 s = htab->elf.srelplt->output_section;
5178 dyn.d_un.d_val -= s->size;
5182 case DT_TLSDESC_PLT:
5184 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5185 + htab->tlsdesc_plt;
5188 case DT_TLSDESC_GOT:
5190 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5191 + htab->tlsdesc_got;
5195 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5198 /* Fill in the special first entry in the procedure linkage table. */
5199 if (htab->elf.splt && htab->elf.splt->size > 0)
5201 /* Fill in the first entry in the procedure linkage table. */
5202 memcpy (htab->elf.splt->contents,
5203 abed->plt0_entry, abed->plt_entry_size);
5204 /* Add offset for pushq GOT+8(%rip), since the instruction
5205 uses 6 bytes subtract this value. */
5206 bfd_put_32 (output_bfd,
5207 (htab->elf.sgotplt->output_section->vma
5208 + htab->elf.sgotplt->output_offset
5210 - htab->elf.splt->output_section->vma
5211 - htab->elf.splt->output_offset
5213 htab->elf.splt->contents + abed->plt0_got1_offset);
5214 /* Add offset for the PC-relative instruction accessing GOT+16,
5215 subtracting the offset to the end of that instruction. */
5216 bfd_put_32 (output_bfd,
5217 (htab->elf.sgotplt->output_section->vma
5218 + htab->elf.sgotplt->output_offset
5220 - htab->elf.splt->output_section->vma
5221 - htab->elf.splt->output_offset
5222 - abed->plt0_got2_insn_end),
5223 htab->elf.splt->contents + abed->plt0_got2_offset);
5225 elf_section_data (htab->elf.splt->output_section)
5226 ->this_hdr.sh_entsize = abed->plt_entry_size;
5228 if (htab->tlsdesc_plt)
5230 bfd_put_64 (output_bfd, (bfd_vma) 0,
5231 htab->elf.sgot->contents + htab->tlsdesc_got);
5233 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5234 abed->plt0_entry, abed->plt_entry_size);
5236 /* Add offset for pushq GOT+8(%rip), since the
5237 instruction uses 6 bytes subtract this value. */
5238 bfd_put_32 (output_bfd,
5239 (htab->elf.sgotplt->output_section->vma
5240 + htab->elf.sgotplt->output_offset
5242 - htab->elf.splt->output_section->vma
5243 - htab->elf.splt->output_offset
5246 htab->elf.splt->contents
5247 + htab->tlsdesc_plt + abed->plt0_got1_offset);
5248 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5249 where TGD stands for htab->tlsdesc_got, subtracting the offset
5250 to the end of that instruction. */
5251 bfd_put_32 (output_bfd,
5252 (htab->elf.sgot->output_section->vma
5253 + htab->elf.sgot->output_offset
5255 - htab->elf.splt->output_section->vma
5256 - htab->elf.splt->output_offset
5258 - abed->plt0_got2_insn_end),
5259 htab->elf.splt->contents
5260 + htab->tlsdesc_plt + abed->plt0_got2_offset);
5265 if (htab->plt_bnd != NULL)
5266 elf_section_data (htab->plt_bnd->output_section)
5267 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
5269 if (htab->elf.sgotplt)
5271 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5273 (*_bfd_error_handler)
5274 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5278 /* Fill in the first three entries in the global offset table. */
5279 if (htab->elf.sgotplt->size > 0)
5281 /* Set the first entry in the global offset table to the address of
5282 the dynamic section. */
5284 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5286 bfd_put_64 (output_bfd,
5287 sdyn->output_section->vma + sdyn->output_offset,
5288 htab->elf.sgotplt->contents);
5289 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5290 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5291 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5294 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
5298 /* Adjust .eh_frame for .plt section. */
5299 if (htab->plt_eh_frame != NULL
5300 && htab->plt_eh_frame->contents != NULL)
5302 if (htab->elf.splt != NULL
5303 && htab->elf.splt->size != 0
5304 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5305 && htab->elf.splt->output_section != NULL
5306 && htab->plt_eh_frame->output_section != NULL)
5308 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5309 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5310 + htab->plt_eh_frame->output_offset
5311 + PLT_FDE_START_OFFSET;
5312 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5313 htab->plt_eh_frame->contents
5314 + PLT_FDE_START_OFFSET);
5316 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5318 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5320 htab->plt_eh_frame->contents))
5325 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5326 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5329 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5330 htab_traverse (htab->loc_hash_table,
5331 elf_x86_64_finish_local_dynamic_symbol,
5337 /* Return address in section PLT for the Ith GOTPLT relocation, for
5338 relocation REL or (bfd_vma) -1 if it should not be included. */
5341 elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
5345 const struct elf_x86_64_backend_data *bed;
5348 /* Only match R_X86_64_JUMP_SLOT and R_X86_64_IRELATIVE. */
5349 if (rel->howto->type != R_X86_64_JUMP_SLOT
5350 && rel->howto->type != R_X86_64_IRELATIVE)
5351 return (bfd_vma) -1;
5354 bed = get_elf_x86_64_backend_data (abfd);
5355 plt_offset = bed->plt_entry_size;
5357 if (elf_elfheader (abfd)->e_ident[EI_OSABI] != ELFOSABI_GNU)
5358 return plt->vma + (i + 1) * plt_offset;
5360 while (plt_offset < plt->size)
5362 bfd_vma reloc_index;
5363 bfd_byte reloc_index_raw[4];
5365 if (!bfd_get_section_contents (abfd, (asection *) plt,
5367 plt_offset + bed->plt_reloc_offset,
5368 sizeof (reloc_index_raw)))
5369 return (bfd_vma) -1;
5371 reloc_index = H_GET_32 (abfd, reloc_index_raw);
5372 if (reloc_index == i)
5373 return plt->vma + plt_offset;
5374 plt_offset += bed->plt_entry_size;
5380 /* Return offset in .plt.bnd section for the Ith GOTPLT relocation with
5381 PLT section, or (bfd_vma) -1 if it should not be included. */
5384 elf_x86_64_plt_sym_val_offset_plt_bnd (bfd_vma i, const asection *plt)
5386 const struct elf_x86_64_backend_data *bed = &elf_x86_64_bnd_arch_bed;
5387 bfd *abfd = plt->owner;
5388 bfd_vma plt_offset = bed->plt_entry_size;
5390 if (elf_elfheader (abfd)->e_ident[EI_OSABI] != ELFOSABI_GNU)
5391 return i * sizeof (elf_x86_64_legacy_plt2_entry);
5393 while (plt_offset < plt->size)
5395 bfd_vma reloc_index;
5396 bfd_byte reloc_index_raw[4];
5398 if (!bfd_get_section_contents (abfd, (asection *) plt,
5400 plt_offset + bed->plt_reloc_offset,
5401 sizeof (reloc_index_raw)))
5402 return (bfd_vma) -1;
5404 reloc_index = H_GET_32 (abfd, reloc_index_raw);
5405 if (reloc_index == i)
5407 /* This is the index in .plt section. */
5408 long plt_index = plt_offset / bed->plt_entry_size;
5409 /* Return the offset in .plt.bnd section. */
5410 return (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry);
5412 plt_offset += bed->plt_entry_size;
5418 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5422 elf_x86_64_get_synthetic_symtab (bfd *abfd,
5429 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5432 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5436 Elf_Internal_Shdr *hdr;
5438 asection *plt, *plt_push;
5440 plt_push = bfd_get_section_by_name (abfd, ".plt");
5441 if (plt_push == NULL)
5444 plt = bfd_get_section_by_name (abfd, ".plt.bnd");
5445 /* Use the generic ELF version if there is no .plt.bnd section. */
5447 return _bfd_elf_get_synthetic_symtab (abfd, symcount, syms,
5448 dynsymcount, dynsyms, ret);
5452 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
5455 if (dynsymcount <= 0)
5458 relplt = bfd_get_section_by_name (abfd, ".rela.plt");
5462 hdr = &elf_section_data (relplt)->this_hdr;
5463 if (hdr->sh_link != elf_dynsymtab (abfd)
5464 || (hdr->sh_type != SHT_REL && hdr->sh_type != SHT_RELA))
5467 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5468 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5471 count = relplt->size / hdr->sh_entsize;
5472 size = count * sizeof (asymbol);
5473 p = relplt->relocation;
5474 for (i = 0; i < count; i++, p += bed->s->int_rels_per_ext_rel)
5476 size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
5478 size += sizeof ("+0x") - 1 + 8 + 8;
5481 s = *ret = (asymbol *) bfd_malloc (size);
5485 names = (char *) (s + count);
5486 p = relplt->relocation;
5488 for (i = 0; i < count; i++, p++)
5493 if (p->howto->type != R_X86_64_JUMP_SLOT
5494 && p->howto->type != R_X86_64_IRELATIVE)
5497 offset = elf_x86_64_plt_sym_val_offset_plt_bnd (i, plt_push);
5499 *s = **p->sym_ptr_ptr;
5500 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
5501 we are defining a symbol, ensure one of them is set. */
5502 if ((s->flags & BSF_LOCAL) == 0)
5503 s->flags |= BSF_GLOBAL;
5504 s->flags |= BSF_SYNTHETIC;
5509 len = strlen ((*p->sym_ptr_ptr)->name);
5510 memcpy (names, (*p->sym_ptr_ptr)->name, len);
5516 memcpy (names, "+0x", sizeof ("+0x") - 1);
5517 names += sizeof ("+0x") - 1;
5518 bfd_sprintf_vma (abfd, buf, p->addend);
5519 for (a = buf; *a == '0'; ++a)
5522 memcpy (names, a, len);
5525 memcpy (names, "@plt", sizeof ("@plt"));
5526 names += sizeof ("@plt");
5533 /* Handle an x86-64 specific section when reading an object file. This
5534 is called when elfcode.h finds a section with an unknown type. */
5537 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5538 const char *name, int shindex)
5540 if (hdr->sh_type != SHT_X86_64_UNWIND)
5543 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5549 /* Hook called by the linker routine which adds symbols from an object
5550 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5554 elf_x86_64_add_symbol_hook (bfd *abfd,
5555 struct bfd_link_info *info,
5556 Elf_Internal_Sym *sym,
5557 const char **namep ATTRIBUTE_UNUSED,
5558 flagword *flagsp ATTRIBUTE_UNUSED,
5564 switch (sym->st_shndx)
5566 case SHN_X86_64_LCOMMON:
5567 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
5570 lcomm = bfd_make_section_with_flags (abfd,
5574 | SEC_LINKER_CREATED));
5577 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
5580 *valp = sym->st_size;
5584 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5585 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5586 && (abfd->flags & DYNAMIC) == 0
5587 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5588 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5594 /* Given a BFD section, try to locate the corresponding ELF section
5598 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
5599 asection *sec, int *index_return)
5601 if (sec == &_bfd_elf_large_com_section)
5603 *index_return = SHN_X86_64_LCOMMON;
5609 /* Process a symbol. */
5612 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5615 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5617 switch (elfsym->internal_elf_sym.st_shndx)
5619 case SHN_X86_64_LCOMMON:
5620 asym->section = &_bfd_elf_large_com_section;
5621 asym->value = elfsym->internal_elf_sym.st_size;
5622 /* Common symbol doesn't set BSF_GLOBAL. */
5623 asym->flags &= ~BSF_GLOBAL;
5629 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5631 return (sym->st_shndx == SHN_COMMON
5632 || sym->st_shndx == SHN_X86_64_LCOMMON);
5636 elf_x86_64_common_section_index (asection *sec)
5638 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5641 return SHN_X86_64_LCOMMON;
5645 elf_x86_64_common_section (asection *sec)
5647 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5648 return bfd_com_section_ptr;
5650 return &_bfd_elf_large_com_section;
5654 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
5655 const Elf_Internal_Sym *sym,
5660 const asection *oldsec)
5662 /* A normal common symbol and a large common symbol result in a
5663 normal common symbol. We turn the large common symbol into a
5666 && h->root.type == bfd_link_hash_common
5668 && bfd_is_com_section (*psec)
5671 if (sym->st_shndx == SHN_COMMON
5672 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
5674 h->root.u.c.p->section
5675 = bfd_make_section_old_way (oldbfd, "COMMON");
5676 h->root.u.c.p->section->flags = SEC_ALLOC;
5678 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5679 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
5680 *psec = bfd_com_section_ptr;
5687 elf_x86_64_additional_program_headers (bfd *abfd,
5688 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5693 /* Check to see if we need a large readonly segment. */
5694 s = bfd_get_section_by_name (abfd, ".lrodata");
5695 if (s && (s->flags & SEC_LOAD))
5698 /* Check to see if we need a large data segment. Since .lbss sections
5699 is placed right after the .bss section, there should be no need for
5700 a large data segment just because of .lbss. */
5701 s = bfd_get_section_by_name (abfd, ".ldata");
5702 if (s && (s->flags & SEC_LOAD))
5708 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5711 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5713 if (h->plt.offset != (bfd_vma) -1
5715 && !h->pointer_equality_needed)
5718 return _bfd_elf_hash_symbol (h);
5721 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5724 elf_x86_64_relocs_compatible (const bfd_target *input,
5725 const bfd_target *output)
5727 return ((xvec_get_elf_backend_data (input)->s->elfclass
5728 == xvec_get_elf_backend_data (output)->s->elfclass)
5729 && _bfd_elf_relocs_compatible (input, output));
5732 static const struct bfd_elf_special_section
5733 elf_x86_64_special_sections[]=
5735 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5736 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5737 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5738 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5739 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5740 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5741 { NULL, 0, 0, 0, 0 }
5744 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5745 #define TARGET_LITTLE_NAME "elf64-x86-64"
5746 #define ELF_ARCH bfd_arch_i386
5747 #define ELF_TARGET_ID X86_64_ELF_DATA
5748 #define ELF_MACHINE_CODE EM_X86_64
5749 #define ELF_MAXPAGESIZE 0x200000
5750 #define ELF_MINPAGESIZE 0x1000
5751 #define ELF_COMMONPAGESIZE 0x1000
5753 #define elf_backend_can_gc_sections 1
5754 #define elf_backend_can_refcount 1
5755 #define elf_backend_want_got_plt 1
5756 #define elf_backend_plt_readonly 1
5757 #define elf_backend_want_plt_sym 0
5758 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5759 #define elf_backend_rela_normal 1
5760 #define elf_backend_plt_alignment 4
5762 #define elf_info_to_howto elf_x86_64_info_to_howto
5764 #define bfd_elf64_bfd_link_hash_table_create \
5765 elf_x86_64_link_hash_table_create
5766 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5767 #define bfd_elf64_bfd_reloc_name_lookup \
5768 elf_x86_64_reloc_name_lookup
5770 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5771 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5772 #define elf_backend_check_relocs elf_x86_64_check_relocs
5773 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5774 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5775 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5776 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5777 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5778 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5779 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5780 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5782 #define elf_backend_write_core_note elf_x86_64_write_core_note
5784 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5785 #define elf_backend_relocate_section elf_x86_64_relocate_section
5786 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5787 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5788 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5789 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5790 #define elf_backend_object_p elf64_x86_64_elf_object_p
5791 #define bfd_elf64_mkobject elf_x86_64_mkobject
5792 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5794 #define elf_backend_section_from_shdr \
5795 elf_x86_64_section_from_shdr
5797 #define elf_backend_section_from_bfd_section \
5798 elf_x86_64_elf_section_from_bfd_section
5799 #define elf_backend_add_symbol_hook \
5800 elf_x86_64_add_symbol_hook
5801 #define elf_backend_symbol_processing \
5802 elf_x86_64_symbol_processing
5803 #define elf_backend_common_section_index \
5804 elf_x86_64_common_section_index
5805 #define elf_backend_common_section \
5806 elf_x86_64_common_section
5807 #define elf_backend_common_definition \
5808 elf_x86_64_common_definition
5809 #define elf_backend_merge_symbol \
5810 elf_x86_64_merge_symbol
5811 #define elf_backend_special_sections \
5812 elf_x86_64_special_sections
5813 #define elf_backend_additional_program_headers \
5814 elf_x86_64_additional_program_headers
5815 #define elf_backend_hash_symbol \
5816 elf_x86_64_hash_symbol
5818 #include "elf64-target.h"
5820 /* FreeBSD support. */
5822 #undef TARGET_LITTLE_SYM
5823 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5824 #undef TARGET_LITTLE_NAME
5825 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5828 #define ELF_OSABI ELFOSABI_FREEBSD
5831 #define elf64_bed elf64_x86_64_fbsd_bed
5833 #include "elf64-target.h"
5835 /* Solaris 2 support. */
5837 #undef TARGET_LITTLE_SYM
5838 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5839 #undef TARGET_LITTLE_NAME
5840 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5842 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5843 objects won't be recognized. */
5847 #define elf64_bed elf64_x86_64_sol2_bed
5849 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5851 #undef elf_backend_static_tls_alignment
5852 #define elf_backend_static_tls_alignment 16
5854 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5856 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5858 #undef elf_backend_want_plt_sym
5859 #define elf_backend_want_plt_sym 1
5861 #include "elf64-target.h"
5863 #undef bfd_elf64_get_synthetic_symtab
5865 /* Native Client support. */
5868 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
5870 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
5871 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
5875 #undef TARGET_LITTLE_SYM
5876 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
5877 #undef TARGET_LITTLE_NAME
5878 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5880 #define elf64_bed elf64_x86_64_nacl_bed
5882 #undef ELF_MAXPAGESIZE
5883 #undef ELF_MINPAGESIZE
5884 #undef ELF_COMMONPAGESIZE
5885 #define ELF_MAXPAGESIZE 0x10000
5886 #define ELF_MINPAGESIZE 0x10000
5887 #define ELF_COMMONPAGESIZE 0x10000
5889 /* Restore defaults. */
5891 #undef elf_backend_static_tls_alignment
5892 #undef elf_backend_want_plt_sym
5893 #define elf_backend_want_plt_sym 0
5895 /* NaCl uses substantially different PLT entries for the same effects. */
5897 #undef elf_backend_plt_alignment
5898 #define elf_backend_plt_alignment 5
5899 #define NACL_PLT_ENTRY_SIZE 64
5900 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5902 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5904 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5905 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5906 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5907 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5908 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5910 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5911 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
5913 /* 32 bytes of nop to pad out to the standard size. */
5914 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5915 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5916 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5917 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5918 0x66, /* excess data32 prefix */
5922 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5924 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5925 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5926 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5927 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5929 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5930 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5931 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5933 /* Lazy GOT entries point here (32-byte aligned). */
5934 0x68, /* pushq immediate */
5935 0, 0, 0, 0, /* replaced with index into relocation table. */
5936 0xe9, /* jmp relative */
5937 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5939 /* 22 bytes of nop to pad out to the standard size. */
5940 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5941 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5942 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5945 /* .eh_frame covering the .plt section. */
5947 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
5949 #if (PLT_CIE_LENGTH != 20 \
5950 || PLT_FDE_LENGTH != 36 \
5951 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5952 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5953 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5955 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5956 0, 0, 0, 0, /* CIE ID */
5957 1, /* CIE version */
5958 'z', 'R', 0, /* Augmentation string */
5959 1, /* Code alignment factor */
5960 0x78, /* Data alignment factor */
5961 16, /* Return address column */
5962 1, /* Augmentation size */
5963 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5964 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5965 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5966 DW_CFA_nop, DW_CFA_nop,
5968 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5969 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
5970 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5971 0, 0, 0, 0, /* .plt size goes here */
5972 0, /* Augmentation size */
5973 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
5974 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5975 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
5976 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5977 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5978 13, /* Block length */
5979 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
5980 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
5981 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5982 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
5983 DW_CFA_nop, DW_CFA_nop
5986 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
5988 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
5989 elf_x86_64_nacl_plt_entry, /* plt_entry */
5990 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5991 2, /* plt0_got1_offset */
5992 9, /* plt0_got2_offset */
5993 13, /* plt0_got2_insn_end */
5994 3, /* plt_got_offset */
5995 33, /* plt_reloc_offset */
5996 38, /* plt_plt_offset */
5997 7, /* plt_got_insn_size */
5998 42, /* plt_plt_insn_end */
5999 32, /* plt_lazy_offset */
6000 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6001 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6004 #undef elf_backend_arch_data
6005 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6007 #undef elf_backend_object_p
6008 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6009 #undef elf_backend_modify_segment_map
6010 #define elf_backend_modify_segment_map nacl_modify_segment_map
6011 #undef elf_backend_modify_program_headers
6012 #define elf_backend_modify_program_headers nacl_modify_program_headers
6013 #undef elf_backend_final_write_processing
6014 #define elf_backend_final_write_processing nacl_final_write_processing
6016 #include "elf64-target.h"
6018 /* Native Client x32 support. */
6021 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6023 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6024 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6028 #undef TARGET_LITTLE_SYM
6029 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6030 #undef TARGET_LITTLE_NAME
6031 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6033 #define elf32_bed elf32_x86_64_nacl_bed
6035 #define bfd_elf32_bfd_link_hash_table_create \
6036 elf_x86_64_link_hash_table_create
6037 #define bfd_elf32_bfd_reloc_type_lookup \
6038 elf_x86_64_reloc_type_lookup
6039 #define bfd_elf32_bfd_reloc_name_lookup \
6040 elf_x86_64_reloc_name_lookup
6041 #define bfd_elf32_mkobject \
6044 #undef elf_backend_object_p
6045 #define elf_backend_object_p \
6046 elf32_x86_64_nacl_elf_object_p
6048 #undef elf_backend_bfd_from_remote_memory
6049 #define elf_backend_bfd_from_remote_memory \
6050 _bfd_elf32_bfd_from_remote_memory
6052 #undef elf_backend_size_info
6053 #define elf_backend_size_info \
6054 _bfd_elf32_size_info
6056 #include "elf32-target.h"
6058 /* Restore defaults. */
6059 #undef elf_backend_object_p
6060 #define elf_backend_object_p elf64_x86_64_elf_object_p
6061 #undef elf_backend_bfd_from_remote_memory
6062 #undef elf_backend_size_info
6063 #undef elf_backend_modify_segment_map
6064 #undef elf_backend_modify_program_headers
6065 #undef elf_backend_final_write_processing
6067 /* Intel L1OM support. */
6070 elf64_l1om_elf_object_p (bfd *abfd)
6072 /* Set the right machine number for an L1OM elf64 file. */
6073 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6077 #undef TARGET_LITTLE_SYM
6078 #define TARGET_LITTLE_SYM l1om_elf64_vec
6079 #undef TARGET_LITTLE_NAME
6080 #define TARGET_LITTLE_NAME "elf64-l1om"
6082 #define ELF_ARCH bfd_arch_l1om
6084 #undef ELF_MACHINE_CODE
6085 #define ELF_MACHINE_CODE EM_L1OM
6090 #define elf64_bed elf64_l1om_bed
6092 #undef elf_backend_object_p
6093 #define elf_backend_object_p elf64_l1om_elf_object_p
6095 /* Restore defaults. */
6096 #undef ELF_MAXPAGESIZE
6097 #undef ELF_MINPAGESIZE
6098 #undef ELF_COMMONPAGESIZE
6099 #define ELF_MAXPAGESIZE 0x200000
6100 #define ELF_MINPAGESIZE 0x1000
6101 #define ELF_COMMONPAGESIZE 0x1000
6102 #undef elf_backend_plt_alignment
6103 #define elf_backend_plt_alignment 4
6104 #undef elf_backend_arch_data
6105 #define elf_backend_arch_data &elf_x86_64_arch_bed
6107 #include "elf64-target.h"
6109 /* FreeBSD L1OM support. */
6111 #undef TARGET_LITTLE_SYM
6112 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6113 #undef TARGET_LITTLE_NAME
6114 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6117 #define ELF_OSABI ELFOSABI_FREEBSD
6120 #define elf64_bed elf64_l1om_fbsd_bed
6122 #include "elf64-target.h"
6124 /* Intel K1OM support. */
6127 elf64_k1om_elf_object_p (bfd *abfd)
6129 /* Set the right machine number for an K1OM elf64 file. */
6130 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6134 #undef TARGET_LITTLE_SYM
6135 #define TARGET_LITTLE_SYM k1om_elf64_vec
6136 #undef TARGET_LITTLE_NAME
6137 #define TARGET_LITTLE_NAME "elf64-k1om"
6139 #define ELF_ARCH bfd_arch_k1om
6141 #undef ELF_MACHINE_CODE
6142 #define ELF_MACHINE_CODE EM_K1OM
6147 #define elf64_bed elf64_k1om_bed
6149 #undef elf_backend_object_p
6150 #define elf_backend_object_p elf64_k1om_elf_object_p
6152 #undef elf_backend_static_tls_alignment
6154 #undef elf_backend_want_plt_sym
6155 #define elf_backend_want_plt_sym 0
6157 #include "elf64-target.h"
6159 /* FreeBSD K1OM support. */
6161 #undef TARGET_LITTLE_SYM
6162 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6163 #undef TARGET_LITTLE_NAME
6164 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6167 #define ELF_OSABI ELFOSABI_FREEBSD
6170 #define elf64_bed elf64_k1om_fbsd_bed
6172 #include "elf64-target.h"
6174 /* 32bit x86-64 support. */
6176 #undef TARGET_LITTLE_SYM
6177 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6178 #undef TARGET_LITTLE_NAME
6179 #define TARGET_LITTLE_NAME "elf32-x86-64"
6183 #define ELF_ARCH bfd_arch_i386
6185 #undef ELF_MACHINE_CODE
6186 #define ELF_MACHINE_CODE EM_X86_64
6190 #undef elf_backend_object_p
6191 #define elf_backend_object_p \
6192 elf32_x86_64_elf_object_p
6194 #undef elf_backend_bfd_from_remote_memory
6195 #define elf_backend_bfd_from_remote_memory \
6196 _bfd_elf32_bfd_from_remote_memory
6198 #undef elf_backend_size_info
6199 #define elf_backend_size_info \
6200 _bfd_elf32_size_info
6202 #include "elf32-target.h"