1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "elf/x86-64.h"
41 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
42 #define MINUS_ONE (~ (bfd_vma) 0)
44 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
45 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
46 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
47 since they are the same. */
49 #define ABI_64_P(abfd) \
50 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52 /* The relocation "howto" table. Order of fields:
53 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
54 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
55 static reloc_howto_type x86_64_elf_howto_table[] =
57 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
60 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
63 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
64 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
67 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
69 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
70 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
72 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
78 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
81 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
84 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
85 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
87 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
88 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
90 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
91 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
93 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
95 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
97 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
99 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
100 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
101 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
104 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
107 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
110 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
113 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
114 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
116 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
117 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
119 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
120 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
122 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
125 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
128 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
130 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
131 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
133 FALSE, 0xffffffff, 0xffffffff, TRUE),
134 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
135 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
137 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
138 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
140 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
141 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
142 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
143 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
144 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
146 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
147 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
149 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
150 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
152 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
153 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
155 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
156 complain_overflow_bitfield, bfd_elf_generic_reloc,
157 "R_X86_64_GOTPC32_TLSDESC",
158 FALSE, 0xffffffff, 0xffffffff, TRUE),
159 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
160 complain_overflow_dont, bfd_elf_generic_reloc,
161 "R_X86_64_TLSDESC_CALL",
163 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
164 complain_overflow_bitfield, bfd_elf_generic_reloc,
166 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
167 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
168 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
170 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
173 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
174 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
176 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
177 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
180 /* We have a gap in the reloc numbers here.
181 R_X86_64_standard counts the number up to this point, and
182 R_X86_64_vt_offset is the value to subtract from a reloc type of
183 R_X86_64_GNU_VT* to form an index into this table. */
184 #define R_X86_64_standard (R_X86_64_PLT32_BND + 1)
185 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
187 /* GNU extension to record C++ vtable hierarchy. */
188 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
189 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
191 /* GNU extension to record C++ vtable member usage. */
192 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
193 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
196 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
197 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
198 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
202 #define IS_X86_64_PCREL_TYPE(TYPE) \
203 ( ((TYPE) == R_X86_64_PC8) \
204 || ((TYPE) == R_X86_64_PC16) \
205 || ((TYPE) == R_X86_64_PC32) \
206 || ((TYPE) == R_X86_64_PC32_BND) \
207 || ((TYPE) == R_X86_64_PC64))
209 /* Map BFD relocs to the x86_64 elf relocs. */
212 bfd_reloc_code_real_type bfd_reloc_val;
213 unsigned char elf_reloc_val;
216 static const struct elf_reloc_map x86_64_reloc_map[] =
218 { BFD_RELOC_NONE, R_X86_64_NONE, },
219 { BFD_RELOC_64, R_X86_64_64, },
220 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
221 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
222 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
223 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
224 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
225 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
226 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
227 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
228 { BFD_RELOC_32, R_X86_64_32, },
229 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
230 { BFD_RELOC_16, R_X86_64_16, },
231 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
232 { BFD_RELOC_8, R_X86_64_8, },
233 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
234 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
235 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
236 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
237 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
238 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
239 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
240 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
241 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
242 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
243 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
244 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
245 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
246 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
247 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
248 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
249 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
250 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
251 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
252 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
253 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
254 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
255 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
256 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND,},
257 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND,},
258 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
259 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
262 static reloc_howto_type *
263 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
267 if (r_type == (unsigned int) R_X86_64_32)
272 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
274 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
275 || r_type >= (unsigned int) R_X86_64_max)
277 if (r_type >= (unsigned int) R_X86_64_standard)
279 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
281 r_type = R_X86_64_NONE;
286 i = r_type - (unsigned int) R_X86_64_vt_offset;
287 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
288 return &x86_64_elf_howto_table[i];
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type *
293 elf_x86_64_reloc_type_lookup (bfd *abfd,
294 bfd_reloc_code_real_type code)
298 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
301 if (x86_64_reloc_map[i].bfd_reloc_val == code)
302 return elf_x86_64_rtype_to_howto (abfd,
303 x86_64_reloc_map[i].elf_reloc_val);
308 static reloc_howto_type *
309 elf_x86_64_reloc_name_lookup (bfd *abfd,
314 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type *reloc
318 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
319 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
323 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
324 if (x86_64_elf_howto_table[i].name != NULL
325 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
326 return &x86_64_elf_howto_table[i];
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
334 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
335 Elf_Internal_Rela *dst)
339 r_type = ELF32_R_TYPE (dst->r_info);
340 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
341 BFD_ASSERT (r_type == cache_ptr->howto->type);
344 /* Support for core dump NOTE sections. */
346 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
351 switch (note->descsz)
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
358 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
361 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
371 elf_tdata (abfd)->core->signal
372 = bfd_get_16 (abfd, note->descdata + 12);
375 elf_tdata (abfd)->core->lwpid
376 = bfd_get_32 (abfd, note->descdata + 32);
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
387 size, note->descpos + offset);
391 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
393 switch (note->descsz)
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd)->core->pid
400 = bfd_get_32 (abfd, note->descdata + 12);
401 elf_tdata (abfd)->core->program
402 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
403 elf_tdata (abfd)->core->command
404 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 24);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
421 char *command = elf_tdata (abfd)->core->command;
422 int n = strlen (command);
424 if (0 < n && command[n - 1] == ' ')
425 command[n - 1] = '\0';
433 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
436 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
438 const char *fname, *psargs;
449 va_start (ap, note_type);
450 fname = va_arg (ap, const char *);
451 psargs = va_arg (ap, const char *);
454 if (bed->s->elfclass == ELFCLASS32)
457 memset (&data, 0, sizeof (data));
458 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
459 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
460 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
461 &data, sizeof (data));
466 memset (&data, 0, sizeof (data));
467 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
468 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
469 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
470 &data, sizeof (data));
475 va_start (ap, note_type);
476 pid = va_arg (ap, long);
477 cursig = va_arg (ap, int);
478 gregs = va_arg (ap, const void *);
481 if (bed->s->elfclass == ELFCLASS32)
483 if (bed->elf_machine_code == EM_X86_64)
485 prstatusx32_t prstat;
486 memset (&prstat, 0, sizeof (prstat));
488 prstat.pr_cursig = cursig;
489 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
490 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
491 &prstat, sizeof (prstat));
496 memset (&prstat, 0, sizeof (prstat));
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
507 memset (&prstat, 0, sizeof (prstat));
509 prstat.pr_cursig = cursig;
510 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
511 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
512 &prstat, sizeof (prstat));
519 /* Functions for the x86-64 ELF linker. */
521 /* The name of the dynamic interpreter. This is put in the .interp
524 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
525 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
527 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
528 copying dynamic variables from a shared lib into an app's dynbss
529 section, and instead use a dynamic relocation to point into the
531 #define ELIMINATE_COPY_RELOCS 1
533 /* The size in bytes of an entry in the global offset table. */
535 #define GOT_ENTRY_SIZE 8
537 /* The size in bytes of an entry in the procedure linkage table. */
539 #define PLT_ENTRY_SIZE 16
541 /* The first entry in a procedure linkage table looks like this. See the
542 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
544 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
546 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
547 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
548 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
551 /* Subsequent entries in a procedure linkage table look like this. */
553 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
555 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
556 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
557 0x68, /* pushq immediate */
558 0, 0, 0, 0, /* replaced with index into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
563 /* The first entry in a procedure linkage table with BND relocations
566 static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
568 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
569 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
570 0x0f, 0x1f, 0 /* nopl (%rax) */
573 /* Subsequent entries for legacy branches in a procedure linkage table
574 with BND relocations look like this. */
576 static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
578 0x68, 0, 0, 0, 0, /* pushq immediate */
579 0xe9, 0, 0, 0, 0, /* jmpq relative */
580 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
583 /* Subsequent entries for branches with BND prefx in a procedure linkage
584 table with BND relocations look like this. */
586 static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
590 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
593 /* Entries for legacy branches in the second procedure linkage table
596 static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
598 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
599 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* Entries for branches with BND prefix in the second procedure linkage
604 table look like this. */
606 static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
608 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
613 /* .eh_frame covering the .plt section. */
615 static const bfd_byte elf_x86_64_eh_frame_plt[] =
617 #define PLT_CIE_LENGTH 20
618 #define PLT_FDE_LENGTH 36
619 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
620 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
621 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
622 0, 0, 0, 0, /* CIE ID */
624 'z', 'R', 0, /* Augmentation string */
625 1, /* Code alignment factor */
626 0x78, /* Data alignment factor */
627 16, /* Return address column */
628 1, /* Augmentation size */
629 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
630 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
631 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
632 DW_CFA_nop, DW_CFA_nop,
634 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
635 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
636 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
637 0, 0, 0, 0, /* .plt size goes here */
638 0, /* Augmentation size */
639 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
640 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
641 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
642 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
643 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
644 11, /* Block length */
645 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
646 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
647 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
648 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
649 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
652 /* Architecture-specific backend data for x86-64. */
654 struct elf_x86_64_backend_data
656 /* Templates for the initial PLT entry and for subsequent entries. */
657 const bfd_byte *plt0_entry;
658 const bfd_byte *plt_entry;
659 unsigned int plt_entry_size; /* Size of each PLT entry. */
661 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
662 unsigned int plt0_got1_offset;
663 unsigned int plt0_got2_offset;
665 /* Offset of the end of the PC-relative instruction containing
667 unsigned int plt0_got2_insn_end;
669 /* Offsets into plt_entry that are to be replaced with... */
670 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
671 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
672 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
674 /* Length of the PC-relative instruction containing plt_got_offset. */
675 unsigned int plt_got_insn_size;
677 /* Offset of the end of the PC-relative jump to plt0_entry. */
678 unsigned int plt_plt_insn_end;
680 /* Offset into plt_entry where the initial value of the GOT entry points. */
681 unsigned int plt_lazy_offset;
683 /* .eh_frame covering the .plt section. */
684 const bfd_byte *eh_frame_plt;
685 unsigned int eh_frame_plt_size;
688 #define get_elf_x86_64_arch_data(bed) \
689 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
691 #define get_elf_x86_64_backend_data(abfd) \
692 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
694 #define GET_PLT_ENTRY_SIZE(abfd) \
695 get_elf_x86_64_backend_data (abfd)->plt_entry_size
697 /* These are the standard parameters. */
698 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
700 elf_x86_64_plt0_entry, /* plt0_entry */
701 elf_x86_64_plt_entry, /* plt_entry */
702 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
703 2, /* plt0_got1_offset */
704 8, /* plt0_got2_offset */
705 12, /* plt0_got2_insn_end */
706 2, /* plt_got_offset */
707 7, /* plt_reloc_offset */
708 12, /* plt_plt_offset */
709 6, /* plt_got_insn_size */
710 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
711 6, /* plt_lazy_offset */
712 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
713 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
716 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
718 elf_x86_64_bnd_plt0_entry, /* plt0_entry */
719 elf_x86_64_bnd_plt_entry, /* plt_entry */
720 sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
721 2, /* plt0_got1_offset */
722 1+8, /* plt0_got2_offset */
723 1+12, /* plt0_got2_insn_end */
724 1+2, /* plt_got_offset */
725 1, /* plt_reloc_offset */
726 7, /* plt_plt_offset */
727 1+6, /* plt_got_insn_size */
728 11, /* plt_plt_insn_end */
729 0, /* plt_lazy_offset */
730 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
731 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
734 #define elf_backend_arch_data &elf_x86_64_arch_bed
736 /* x86-64 ELF linker hash entry. */
738 struct elf_x86_64_link_hash_entry
740 struct elf_link_hash_entry elf;
742 /* Track dynamic relocs copied for this symbol. */
743 struct elf_dyn_relocs *dyn_relocs;
745 #define GOT_UNKNOWN 0
749 #define GOT_TLS_GDESC 4
750 #define GOT_TLS_GD_BOTH_P(type) \
751 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
752 #define GOT_TLS_GD_P(type) \
753 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
754 #define GOT_TLS_GDESC_P(type) \
755 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
756 #define GOT_TLS_GD_ANY_P(type) \
757 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
758 unsigned char tls_type;
760 /* TRUE if a weak symbol with a real definition needs a copy reloc.
761 When there is a weak symbol with a real definition, the processor
762 independent code will have arranged for us to see the real
763 definition first. We need to copy the needs_copy bit from the
764 real definition and check it when allowing copy reloc in PIE. */
765 unsigned int needs_copy : 1;
767 /* TRUE if symbol has at least one BND relocation. */
768 unsigned int has_bnd_reloc : 1;
770 /* Information about the GOT PLT entry. Filled when there are both
771 GOT and PLT relocations against the same function. */
772 union gotplt_union plt_got;
774 /* Information about the second PLT entry. Filled when has_bnd_reloc is
776 union gotplt_union plt_bnd;
778 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
779 starting at the end of the jump table. */
783 #define elf_x86_64_hash_entry(ent) \
784 ((struct elf_x86_64_link_hash_entry *)(ent))
786 struct elf_x86_64_obj_tdata
788 struct elf_obj_tdata root;
790 /* tls_type for each local got entry. */
791 char *local_got_tls_type;
793 /* GOTPLT entries for TLS descriptors. */
794 bfd_vma *local_tlsdesc_gotent;
797 #define elf_x86_64_tdata(abfd) \
798 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
800 #define elf_x86_64_local_got_tls_type(abfd) \
801 (elf_x86_64_tdata (abfd)->local_got_tls_type)
803 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
804 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
806 #define is_x86_64_elf(bfd) \
807 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
808 && elf_tdata (bfd) != NULL \
809 && elf_object_id (bfd) == X86_64_ELF_DATA)
812 elf_x86_64_mkobject (bfd *abfd)
814 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
818 /* x86-64 ELF linker hash table. */
820 struct elf_x86_64_link_hash_table
822 struct elf_link_hash_table elf;
824 /* Short-cuts to get to dynamic linker sections. */
827 asection *plt_eh_frame;
833 bfd_signed_vma refcount;
837 /* The amount of space used by the jump slots in the GOT. */
838 bfd_vma sgotplt_jump_table_size;
840 /* Small local sym cache. */
841 struct sym_cache sym_cache;
843 bfd_vma (*r_info) (bfd_vma, bfd_vma);
844 bfd_vma (*r_sym) (bfd_vma);
845 unsigned int pointer_r_type;
846 const char *dynamic_interpreter;
847 int dynamic_interpreter_size;
849 /* _TLS_MODULE_BASE_ symbol. */
850 struct bfd_link_hash_entry *tls_module_base;
852 /* Used by local STT_GNU_IFUNC symbols. */
853 htab_t loc_hash_table;
854 void * loc_hash_memory;
856 /* The offset into splt of the PLT entry for the TLS descriptor
857 resolver. Special values are 0, if not necessary (or not found
858 to be necessary yet), and -1 if needed but not determined
861 /* The offset into sgot of the GOT entry used by the PLT entry
865 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
866 bfd_vma next_jump_slot_index;
867 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
868 bfd_vma next_irelative_index;
871 /* Get the x86-64 ELF linker hash table from a link_info structure. */
873 #define elf_x86_64_hash_table(p) \
874 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
875 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
877 #define elf_x86_64_compute_jump_table_size(htab) \
878 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
880 /* Create an entry in an x86-64 ELF linker hash table. */
882 static struct bfd_hash_entry *
883 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
884 struct bfd_hash_table *table,
887 /* Allocate the structure if it has not already been allocated by a
891 entry = (struct bfd_hash_entry *)
892 bfd_hash_allocate (table,
893 sizeof (struct elf_x86_64_link_hash_entry));
898 /* Call the allocation method of the superclass. */
899 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
902 struct elf_x86_64_link_hash_entry *eh;
904 eh = (struct elf_x86_64_link_hash_entry *) entry;
905 eh->dyn_relocs = NULL;
906 eh->tls_type = GOT_UNKNOWN;
908 eh->has_bnd_reloc = 0;
909 eh->plt_bnd.offset = (bfd_vma) -1;
910 eh->plt_got.offset = (bfd_vma) -1;
911 eh->tlsdesc_got = (bfd_vma) -1;
917 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
918 for local symbol so that we can handle local STT_GNU_IFUNC symbols
919 as global symbol. We reuse indx and dynstr_index for local symbol
920 hash since they aren't used by global symbols in this backend. */
923 elf_x86_64_local_htab_hash (const void *ptr)
925 struct elf_link_hash_entry *h
926 = (struct elf_link_hash_entry *) ptr;
927 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
930 /* Compare local hash entries. */
933 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
935 struct elf_link_hash_entry *h1
936 = (struct elf_link_hash_entry *) ptr1;
937 struct elf_link_hash_entry *h2
938 = (struct elf_link_hash_entry *) ptr2;
940 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
943 /* Find and/or create a hash entry for local symbol. */
945 static struct elf_link_hash_entry *
946 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
947 bfd *abfd, const Elf_Internal_Rela *rel,
950 struct elf_x86_64_link_hash_entry e, *ret;
951 asection *sec = abfd->sections;
952 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
953 htab->r_sym (rel->r_info));
956 e.elf.indx = sec->id;
957 e.elf.dynstr_index = htab->r_sym (rel->r_info);
958 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
959 create ? INSERT : NO_INSERT);
966 ret = (struct elf_x86_64_link_hash_entry *) *slot;
970 ret = (struct elf_x86_64_link_hash_entry *)
971 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
972 sizeof (struct elf_x86_64_link_hash_entry));
975 memset (ret, 0, sizeof (*ret));
976 ret->elf.indx = sec->id;
977 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
978 ret->elf.dynindx = -1;
979 ret->plt_got.offset = (bfd_vma) -1;
985 /* Destroy an X86-64 ELF linker hash table. */
988 elf_x86_64_link_hash_table_free (bfd *obfd)
990 struct elf_x86_64_link_hash_table *htab
991 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
993 if (htab->loc_hash_table)
994 htab_delete (htab->loc_hash_table);
995 if (htab->loc_hash_memory)
996 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
997 _bfd_elf_link_hash_table_free (obfd);
1000 /* Create an X86-64 ELF linker hash table. */
1002 static struct bfd_link_hash_table *
1003 elf_x86_64_link_hash_table_create (bfd *abfd)
1005 struct elf_x86_64_link_hash_table *ret;
1006 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
1008 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
1012 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1013 elf_x86_64_link_hash_newfunc,
1014 sizeof (struct elf_x86_64_link_hash_entry),
1021 if (ABI_64_P (abfd))
1023 ret->r_info = elf64_r_info;
1024 ret->r_sym = elf64_r_sym;
1025 ret->pointer_r_type = R_X86_64_64;
1026 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1027 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1031 ret->r_info = elf32_r_info;
1032 ret->r_sym = elf32_r_sym;
1033 ret->pointer_r_type = R_X86_64_32;
1034 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1035 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1038 ret->loc_hash_table = htab_try_create (1024,
1039 elf_x86_64_local_htab_hash,
1040 elf_x86_64_local_htab_eq,
1042 ret->loc_hash_memory = objalloc_create ();
1043 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1045 elf_x86_64_link_hash_table_free (abfd);
1048 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1050 return &ret->elf.root;
1053 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1054 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1058 elf_x86_64_create_dynamic_sections (bfd *dynobj,
1059 struct bfd_link_info *info)
1061 struct elf_x86_64_link_hash_table *htab;
1063 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1066 htab = elf_x86_64_hash_table (info);
1070 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1074 if (info->executable)
1076 /* Always allow copy relocs for building executables. */
1077 asection *s = bfd_get_linker_section (dynobj, ".rela.bss");
1080 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1081 s = bfd_make_section_anyway_with_flags (dynobj,
1083 (bed->dynamic_sec_flags
1086 || ! bfd_set_section_alignment (dynobj, s,
1087 bed->s->log_file_align))
1093 if (!info->no_ld_generated_unwind_info
1094 && htab->plt_eh_frame == NULL
1095 && htab->elf.splt != NULL)
1097 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1098 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1099 | SEC_LINKER_CREATED);
1101 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1102 if (htab->plt_eh_frame == NULL
1103 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
1109 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1112 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1113 struct elf_link_hash_entry *dir,
1114 struct elf_link_hash_entry *ind)
1116 struct elf_x86_64_link_hash_entry *edir, *eind;
1118 edir = (struct elf_x86_64_link_hash_entry *) dir;
1119 eind = (struct elf_x86_64_link_hash_entry *) ind;
1121 if (!edir->has_bnd_reloc)
1122 edir->has_bnd_reloc = eind->has_bnd_reloc;
1124 if (eind->dyn_relocs != NULL)
1126 if (edir->dyn_relocs != NULL)
1128 struct elf_dyn_relocs **pp;
1129 struct elf_dyn_relocs *p;
1131 /* Add reloc counts against the indirect sym to the direct sym
1132 list. Merge any entries against the same section. */
1133 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1135 struct elf_dyn_relocs *q;
1137 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1138 if (q->sec == p->sec)
1140 q->pc_count += p->pc_count;
1141 q->count += p->count;
1148 *pp = edir->dyn_relocs;
1151 edir->dyn_relocs = eind->dyn_relocs;
1152 eind->dyn_relocs = NULL;
1155 if (ind->root.type == bfd_link_hash_indirect
1156 && dir->got.refcount <= 0)
1158 edir->tls_type = eind->tls_type;
1159 eind->tls_type = GOT_UNKNOWN;
1162 if (ELIMINATE_COPY_RELOCS
1163 && ind->root.type != bfd_link_hash_indirect
1164 && dir->dynamic_adjusted)
1166 /* If called to transfer flags for a weakdef during processing
1167 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1168 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1169 dir->ref_dynamic |= ind->ref_dynamic;
1170 dir->ref_regular |= ind->ref_regular;
1171 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1172 dir->needs_plt |= ind->needs_plt;
1173 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1176 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1180 elf64_x86_64_elf_object_p (bfd *abfd)
1182 /* Set the right machine number for an x86-64 elf64 file. */
1183 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1188 elf32_x86_64_elf_object_p (bfd *abfd)
1190 /* Set the right machine number for an x86-64 elf32 file. */
1191 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1195 /* Return TRUE if the TLS access code sequence support transition
1199 elf_x86_64_check_tls_transition (bfd *abfd,
1200 struct bfd_link_info *info,
1203 Elf_Internal_Shdr *symtab_hdr,
1204 struct elf_link_hash_entry **sym_hashes,
1205 unsigned int r_type,
1206 const Elf_Internal_Rela *rel,
1207 const Elf_Internal_Rela *relend)
1210 unsigned long r_symndx;
1211 bfd_boolean largepic = FALSE;
1212 struct elf_link_hash_entry *h;
1214 struct elf_x86_64_link_hash_table *htab;
1216 /* Get the section contents. */
1217 if (contents == NULL)
1219 if (elf_section_data (sec)->this_hdr.contents != NULL)
1220 contents = elf_section_data (sec)->this_hdr.contents;
1223 /* FIXME: How to better handle error condition? */
1224 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1227 /* Cache the section contents for elf_link_input_bfd. */
1228 elf_section_data (sec)->this_hdr.contents = contents;
1232 htab = elf_x86_64_hash_table (info);
1233 offset = rel->r_offset;
1236 case R_X86_64_TLSGD:
1237 case R_X86_64_TLSLD:
1238 if ((rel + 1) >= relend)
1241 if (r_type == R_X86_64_TLSGD)
1243 /* Check transition from GD access model. For 64bit, only
1244 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1245 .word 0x6666; rex64; call __tls_get_addr
1246 can transit to different access model. For 32bit, only
1247 leaq foo@tlsgd(%rip), %rdi
1248 .word 0x6666; rex64; call __tls_get_addr
1249 can transit to different access model. For largepic
1251 leaq foo@tlsgd(%rip), %rdi
1252 movabsq $__tls_get_addr@pltoff, %rax
1256 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1257 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1259 if ((offset + 12) > sec->size)
1262 if (memcmp (contents + offset + 4, call, 4) != 0)
1264 if (!ABI_64_P (abfd)
1265 || (offset + 19) > sec->size
1267 || memcmp (contents + offset - 3, leaq + 1, 3) != 0
1268 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1269 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1274 else if (ABI_64_P (abfd))
1277 || memcmp (contents + offset - 4, leaq, 4) != 0)
1283 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1289 /* Check transition from LD access model. Only
1290 leaq foo@tlsld(%rip), %rdi;
1292 can transit to different access model. For largepic
1294 leaq foo@tlsld(%rip), %rdi
1295 movabsq $__tls_get_addr@pltoff, %rax
1299 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1301 if (offset < 3 || (offset + 9) > sec->size)
1304 if (memcmp (contents + offset - 3, lea, 3) != 0)
1307 if (0xe8 != *(contents + offset + 4))
1309 if (!ABI_64_P (abfd)
1310 || (offset + 19) > sec->size
1311 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1312 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1319 r_symndx = htab->r_sym (rel[1].r_info);
1320 if (r_symndx < symtab_hdr->sh_info)
1323 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1324 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1325 may be versioned. */
1327 && h->root.root.string != NULL
1329 ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64
1330 : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1331 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32))
1332 && (strncmp (h->root.root.string,
1333 "__tls_get_addr", 14) == 0));
1335 case R_X86_64_GOTTPOFF:
1336 /* Check transition from IE access model:
1337 mov foo@gottpoff(%rip), %reg
1338 add foo@gottpoff(%rip), %reg
1341 /* Check REX prefix first. */
1342 if (offset >= 3 && (offset + 4) <= sec->size)
1344 val = bfd_get_8 (abfd, contents + offset - 3);
1345 if (val != 0x48 && val != 0x4c)
1347 /* X32 may have 0x44 REX prefix or no REX prefix. */
1348 if (ABI_64_P (abfd))
1354 /* X32 may not have any REX prefix. */
1355 if (ABI_64_P (abfd))
1357 if (offset < 2 || (offset + 3) > sec->size)
1361 val = bfd_get_8 (abfd, contents + offset - 2);
1362 if (val != 0x8b && val != 0x03)
1365 val = bfd_get_8 (abfd, contents + offset - 1);
1366 return (val & 0xc7) == 5;
1368 case R_X86_64_GOTPC32_TLSDESC:
1369 /* Check transition from GDesc access model:
1370 leaq x@tlsdesc(%rip), %rax
1372 Make sure it's a leaq adding rip to a 32-bit offset
1373 into any register, although it's probably almost always
1376 if (offset < 3 || (offset + 4) > sec->size)
1379 val = bfd_get_8 (abfd, contents + offset - 3);
1380 if ((val & 0xfb) != 0x48)
1383 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1386 val = bfd_get_8 (abfd, contents + offset - 1);
1387 return (val & 0xc7) == 0x05;
1389 case R_X86_64_TLSDESC_CALL:
1390 /* Check transition from GDesc access model:
1391 call *x@tlsdesc(%rax)
1393 if (offset + 2 <= sec->size)
1395 /* Make sure that it's a call *x@tlsdesc(%rax). */
1396 static const unsigned char call[] = { 0xff, 0x10 };
1397 return memcmp (contents + offset, call, 2) == 0;
1407 /* Return TRUE if the TLS access transition is OK or no transition
1408 will be performed. Update R_TYPE if there is a transition. */
1411 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1412 asection *sec, bfd_byte *contents,
1413 Elf_Internal_Shdr *symtab_hdr,
1414 struct elf_link_hash_entry **sym_hashes,
1415 unsigned int *r_type, int tls_type,
1416 const Elf_Internal_Rela *rel,
1417 const Elf_Internal_Rela *relend,
1418 struct elf_link_hash_entry *h,
1419 unsigned long r_symndx)
1421 unsigned int from_type = *r_type;
1422 unsigned int to_type = from_type;
1423 bfd_boolean check = TRUE;
1425 /* Skip TLS transition for functions. */
1427 && (h->type == STT_FUNC
1428 || h->type == STT_GNU_IFUNC))
1433 case R_X86_64_TLSGD:
1434 case R_X86_64_GOTPC32_TLSDESC:
1435 case R_X86_64_TLSDESC_CALL:
1436 case R_X86_64_GOTTPOFF:
1437 if (info->executable)
1440 to_type = R_X86_64_TPOFF32;
1442 to_type = R_X86_64_GOTTPOFF;
1445 /* When we are called from elf_x86_64_relocate_section,
1446 CONTENTS isn't NULL and there may be additional transitions
1447 based on TLS_TYPE. */
1448 if (contents != NULL)
1450 unsigned int new_to_type = to_type;
1452 if (info->executable
1455 && tls_type == GOT_TLS_IE)
1456 new_to_type = R_X86_64_TPOFF32;
1458 if (to_type == R_X86_64_TLSGD
1459 || to_type == R_X86_64_GOTPC32_TLSDESC
1460 || to_type == R_X86_64_TLSDESC_CALL)
1462 if (tls_type == GOT_TLS_IE)
1463 new_to_type = R_X86_64_GOTTPOFF;
1466 /* We checked the transition before when we were called from
1467 elf_x86_64_check_relocs. We only want to check the new
1468 transition which hasn't been checked before. */
1469 check = new_to_type != to_type && from_type == to_type;
1470 to_type = new_to_type;
1475 case R_X86_64_TLSLD:
1476 if (info->executable)
1477 to_type = R_X86_64_TPOFF32;
1484 /* Return TRUE if there is no transition. */
1485 if (from_type == to_type)
1488 /* Check if the transition can be performed. */
1490 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1491 symtab_hdr, sym_hashes,
1492 from_type, rel, relend))
1494 reloc_howto_type *from, *to;
1497 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1498 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1501 name = h->root.root.string;
1504 struct elf_x86_64_link_hash_table *htab;
1506 htab = elf_x86_64_hash_table (info);
1511 Elf_Internal_Sym *isym;
1513 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1515 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1519 (*_bfd_error_handler)
1520 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1521 "in section `%A' failed"),
1522 abfd, sec, from->name, to->name, name,
1523 (unsigned long) rel->r_offset);
1524 bfd_set_error (bfd_error_bad_value);
1532 /* Rename some of the generic section flags to better document how they
1534 #define need_convert_mov_to_lea sec_flg0
1536 /* Look through the relocs for a section during the first phase, and
1537 calculate needed space in the global offset table, procedure
1538 linkage table, and dynamic reloc sections. */
1541 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1543 const Elf_Internal_Rela *relocs)
1545 struct elf_x86_64_link_hash_table *htab;
1546 Elf_Internal_Shdr *symtab_hdr;
1547 struct elf_link_hash_entry **sym_hashes;
1548 const Elf_Internal_Rela *rel;
1549 const Elf_Internal_Rela *rel_end;
1551 bfd_boolean use_plt_got;
1553 if (info->relocatable)
1556 BFD_ASSERT (is_x86_64_elf (abfd));
1558 htab = elf_x86_64_hash_table (info);
1562 use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
1564 symtab_hdr = &elf_symtab_hdr (abfd);
1565 sym_hashes = elf_sym_hashes (abfd);
1569 rel_end = relocs + sec->reloc_count;
1570 for (rel = relocs; rel < rel_end; rel++)
1572 unsigned int r_type;
1573 unsigned long r_symndx;
1574 struct elf_link_hash_entry *h;
1575 Elf_Internal_Sym *isym;
1577 bfd_boolean size_reloc;
1579 r_symndx = htab->r_sym (rel->r_info);
1580 r_type = ELF32_R_TYPE (rel->r_info);
1582 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1584 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1589 if (r_symndx < symtab_hdr->sh_info)
1591 /* A local symbol. */
1592 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1597 /* Check relocation against local STT_GNU_IFUNC symbol. */
1598 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1600 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1605 /* Fake a STT_GNU_IFUNC symbol. */
1606 h->type = STT_GNU_IFUNC;
1609 h->forced_local = 1;
1610 h->root.type = bfd_link_hash_defined;
1618 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1619 while (h->root.type == bfd_link_hash_indirect
1620 || h->root.type == bfd_link_hash_warning)
1621 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1624 /* Check invalid x32 relocations. */
1625 if (!ABI_64_P (abfd))
1631 case R_X86_64_DTPOFF64:
1632 case R_X86_64_TPOFF64:
1634 case R_X86_64_GOTOFF64:
1635 case R_X86_64_GOT64:
1636 case R_X86_64_GOTPCREL64:
1637 case R_X86_64_GOTPC64:
1638 case R_X86_64_GOTPLT64:
1639 case R_X86_64_PLTOFF64:
1642 name = h->root.root.string;
1644 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1646 (*_bfd_error_handler)
1647 (_("%B: relocation %s against symbol `%s' isn't "
1648 "supported in x32 mode"), abfd,
1649 x86_64_elf_howto_table[r_type].name, name);
1650 bfd_set_error (bfd_error_bad_value);
1658 /* Create the ifunc sections for static executables. If we
1659 never see an indirect function symbol nor we are building
1660 a static executable, those sections will be empty and
1661 won't appear in output. */
1667 case R_X86_64_PC32_BND:
1668 case R_X86_64_PLT32_BND:
1670 case R_X86_64_PLT32:
1673 /* MPX PLT is supported only if elf_x86_64_arch_bed
1674 is used in 64-bit mode. */
1677 && (get_elf_x86_64_backend_data (abfd)
1678 == &elf_x86_64_arch_bed))
1680 elf_x86_64_hash_entry (h)->has_bnd_reloc = 1;
1682 /* Create the second PLT for Intel MPX support. */
1683 if (htab->plt_bnd == NULL)
1685 unsigned int plt_bnd_align;
1686 const struct elf_backend_data *bed;
1688 bed = get_elf_backend_data (info->output_bfd);
1689 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) == 8
1690 && (sizeof (elf_x86_64_bnd_plt2_entry)
1691 == sizeof (elf_x86_64_legacy_plt2_entry)));
1694 if (htab->elf.dynobj == NULL)
1695 htab->elf.dynobj = abfd;
1697 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1699 (bed->dynamic_sec_flags
1704 if (htab->plt_bnd == NULL
1705 || !bfd_set_section_alignment (htab->elf.dynobj,
1714 case R_X86_64_GOTPCREL:
1715 case R_X86_64_GOTPCREL64:
1716 if (htab->elf.dynobj == NULL)
1717 htab->elf.dynobj = abfd;
1718 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1723 /* It is referenced by a non-shared object. */
1725 h->root.non_ir_ref = 1;
1728 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1729 symtab_hdr, sym_hashes,
1730 &r_type, GOT_UNKNOWN,
1731 rel, rel_end, h, r_symndx))
1736 case R_X86_64_TLSLD:
1737 htab->tls_ld_got.refcount += 1;
1740 case R_X86_64_TPOFF32:
1741 if (!info->executable && ABI_64_P (abfd))
1744 name = h->root.root.string;
1746 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1748 (*_bfd_error_handler)
1749 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1751 x86_64_elf_howto_table[r_type].name, name);
1752 bfd_set_error (bfd_error_bad_value);
1757 case R_X86_64_GOTTPOFF:
1758 if (!info->executable)
1759 info->flags |= DF_STATIC_TLS;
1762 case R_X86_64_GOT32:
1763 case R_X86_64_GOTPCREL:
1764 case R_X86_64_TLSGD:
1765 case R_X86_64_GOT64:
1766 case R_X86_64_GOTPCREL64:
1767 case R_X86_64_GOTPLT64:
1768 case R_X86_64_GOTPC32_TLSDESC:
1769 case R_X86_64_TLSDESC_CALL:
1770 /* This symbol requires a global offset table entry. */
1772 int tls_type, old_tls_type;
1776 default: tls_type = GOT_NORMAL; break;
1777 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1778 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1779 case R_X86_64_GOTPC32_TLSDESC:
1780 case R_X86_64_TLSDESC_CALL:
1781 tls_type = GOT_TLS_GDESC; break;
1786 h->got.refcount += 1;
1787 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1791 bfd_signed_vma *local_got_refcounts;
1793 /* This is a global offset table entry for a local symbol. */
1794 local_got_refcounts = elf_local_got_refcounts (abfd);
1795 if (local_got_refcounts == NULL)
1799 size = symtab_hdr->sh_info;
1800 size *= sizeof (bfd_signed_vma)
1801 + sizeof (bfd_vma) + sizeof (char);
1802 local_got_refcounts = ((bfd_signed_vma *)
1803 bfd_zalloc (abfd, size));
1804 if (local_got_refcounts == NULL)
1806 elf_local_got_refcounts (abfd) = local_got_refcounts;
1807 elf_x86_64_local_tlsdesc_gotent (abfd)
1808 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1809 elf_x86_64_local_got_tls_type (abfd)
1810 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1812 local_got_refcounts[r_symndx] += 1;
1814 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1817 /* If a TLS symbol is accessed using IE at least once,
1818 there is no point to use dynamic model for it. */
1819 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1820 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1821 || tls_type != GOT_TLS_IE))
1823 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1824 tls_type = old_tls_type;
1825 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1826 && GOT_TLS_GD_ANY_P (tls_type))
1827 tls_type |= old_tls_type;
1831 name = h->root.root.string;
1833 name = bfd_elf_sym_name (abfd, symtab_hdr,
1835 (*_bfd_error_handler)
1836 (_("%B: '%s' accessed both as normal and thread local symbol"),
1838 bfd_set_error (bfd_error_bad_value);
1843 if (old_tls_type != tls_type)
1846 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1848 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1853 case R_X86_64_GOTOFF64:
1854 case R_X86_64_GOTPC32:
1855 case R_X86_64_GOTPC64:
1857 if (htab->elf.sgot == NULL)
1859 if (htab->elf.dynobj == NULL)
1860 htab->elf.dynobj = abfd;
1861 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1867 case R_X86_64_PLT32:
1868 case R_X86_64_PLT32_BND:
1869 /* This symbol requires a procedure linkage table entry. We
1870 actually build the entry in adjust_dynamic_symbol,
1871 because this might be a case of linking PIC code which is
1872 never referenced by a dynamic object, in which case we
1873 don't need to generate a procedure linkage table entry
1876 /* If this is a local symbol, we resolve it directly without
1877 creating a procedure linkage table entry. */
1882 h->plt.refcount += 1;
1885 case R_X86_64_PLTOFF64:
1886 /* This tries to form the 'address' of a function relative
1887 to GOT. For global symbols we need a PLT entry. */
1891 h->plt.refcount += 1;
1895 case R_X86_64_SIZE32:
1896 case R_X86_64_SIZE64:
1901 if (!ABI_64_P (abfd))
1906 /* Let's help debug shared library creation. These relocs
1907 cannot be used in shared libs. Don't error out for
1908 sections we don't care about, such as debug sections or
1909 non-constant sections. */
1911 && (sec->flags & SEC_ALLOC) != 0
1912 && (sec->flags & SEC_READONLY) != 0)
1915 name = h->root.root.string;
1917 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1918 (*_bfd_error_handler)
1919 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1920 abfd, x86_64_elf_howto_table[r_type].name, name);
1921 bfd_set_error (bfd_error_bad_value);
1929 case R_X86_64_PC32_BND:
1933 if (h != NULL && info->executable)
1935 /* If this reloc is in a read-only section, we might
1936 need a copy reloc. We can't check reliably at this
1937 stage whether the section is read-only, as input
1938 sections have not yet been mapped to output sections.
1939 Tentatively set the flag for now, and correct in
1940 adjust_dynamic_symbol. */
1943 /* We may need a .plt entry if the function this reloc
1944 refers to is in a shared lib. */
1945 h->plt.refcount += 1;
1946 if (r_type != R_X86_64_PC32
1947 && r_type != R_X86_64_PC32_BND
1948 && r_type != R_X86_64_PC64)
1949 h->pointer_equality_needed = 1;
1954 /* If we are creating a shared library, and this is a reloc
1955 against a global symbol, or a non PC relative reloc
1956 against a local symbol, then we need to copy the reloc
1957 into the shared library. However, if we are linking with
1958 -Bsymbolic, we do not need to copy a reloc against a
1959 global symbol which is defined in an object we are
1960 including in the link (i.e., DEF_REGULAR is set). At
1961 this point we have not seen all the input files, so it is
1962 possible that DEF_REGULAR is not set now but will be set
1963 later (it is never cleared). In case of a weak definition,
1964 DEF_REGULAR may be cleared later by a strong definition in
1965 a shared library. We account for that possibility below by
1966 storing information in the relocs_copied field of the hash
1967 table entry. A similar situation occurs when creating
1968 shared libraries and symbol visibility changes render the
1971 If on the other hand, we are creating an executable, we
1972 may need to keep relocations for symbols satisfied by a
1973 dynamic library if we manage to avoid copy relocs for the
1976 && (sec->flags & SEC_ALLOC) != 0
1977 && (! IS_X86_64_PCREL_TYPE (r_type)
1979 && (! SYMBOLIC_BIND (info, h)
1980 || h->root.type == bfd_link_hash_defweak
1981 || !h->def_regular))))
1982 || (ELIMINATE_COPY_RELOCS
1984 && (sec->flags & SEC_ALLOC) != 0
1986 && (h->root.type == bfd_link_hash_defweak
1987 || !h->def_regular)))
1989 struct elf_dyn_relocs *p;
1990 struct elf_dyn_relocs **head;
1992 /* We must copy these reloc types into the output file.
1993 Create a reloc section in dynobj and make room for
1997 if (htab->elf.dynobj == NULL)
1998 htab->elf.dynobj = abfd;
2000 sreloc = _bfd_elf_make_dynamic_reloc_section
2001 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2002 abfd, /*rela?*/ TRUE);
2008 /* If this is a global symbol, we count the number of
2009 relocations we need for this symbol. */
2012 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
2016 /* Track dynamic relocs needed for local syms too.
2017 We really need local syms available to do this
2022 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2027 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2031 /* Beware of type punned pointers vs strict aliasing
2033 vpp = &(elf_section_data (s)->local_dynrel);
2034 head = (struct elf_dyn_relocs **)vpp;
2038 if (p == NULL || p->sec != sec)
2040 bfd_size_type amt = sizeof *p;
2042 p = ((struct elf_dyn_relocs *)
2043 bfd_alloc (htab->elf.dynobj, amt));
2054 /* Count size relocation as PC-relative relocation. */
2055 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2060 /* This relocation describes the C++ object vtable hierarchy.
2061 Reconstruct it for later use during GC. */
2062 case R_X86_64_GNU_VTINHERIT:
2063 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2067 /* This relocation describes which C++ vtable entries are actually
2068 used. Record for later use during GC. */
2069 case R_X86_64_GNU_VTENTRY:
2070 BFD_ASSERT (h != NULL);
2072 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2082 && h->plt.refcount > 0
2083 && ((info->flags & DF_BIND_NOW) || h->got.refcount > 0)
2084 && htab->plt_got == NULL)
2086 /* Create the GOT procedure linkage table. */
2087 unsigned int plt_got_align;
2088 const struct elf_backend_data *bed;
2090 bed = get_elf_backend_data (info->output_bfd);
2091 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry) == 8
2092 && (sizeof (elf_x86_64_bnd_plt2_entry)
2093 == sizeof (elf_x86_64_legacy_plt2_entry)));
2096 if (htab->elf.dynobj == NULL)
2097 htab->elf.dynobj = abfd;
2099 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2101 (bed->dynamic_sec_flags
2106 if (htab->plt_got == NULL
2107 || !bfd_set_section_alignment (htab->elf.dynobj,
2113 if (r_type == R_X86_64_GOTPCREL
2114 && (h == NULL || h->type != STT_GNU_IFUNC))
2115 sec->need_convert_mov_to_lea = 1;
2121 /* Return the section that should be marked against GC for a given
2125 elf_x86_64_gc_mark_hook (asection *sec,
2126 struct bfd_link_info *info,
2127 Elf_Internal_Rela *rel,
2128 struct elf_link_hash_entry *h,
2129 Elf_Internal_Sym *sym)
2132 switch (ELF32_R_TYPE (rel->r_info))
2134 case R_X86_64_GNU_VTINHERIT:
2135 case R_X86_64_GNU_VTENTRY:
2139 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2142 /* Update the got entry reference counts for the section being removed. */
2145 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
2147 const Elf_Internal_Rela *relocs)
2149 struct elf_x86_64_link_hash_table *htab;
2150 Elf_Internal_Shdr *symtab_hdr;
2151 struct elf_link_hash_entry **sym_hashes;
2152 bfd_signed_vma *local_got_refcounts;
2153 const Elf_Internal_Rela *rel, *relend;
2155 if (info->relocatable)
2158 htab = elf_x86_64_hash_table (info);
2162 elf_section_data (sec)->local_dynrel = NULL;
2164 symtab_hdr = &elf_symtab_hdr (abfd);
2165 sym_hashes = elf_sym_hashes (abfd);
2166 local_got_refcounts = elf_local_got_refcounts (abfd);
2168 htab = elf_x86_64_hash_table (info);
2169 relend = relocs + sec->reloc_count;
2170 for (rel = relocs; rel < relend; rel++)
2172 unsigned long r_symndx;
2173 unsigned int r_type;
2174 struct elf_link_hash_entry *h = NULL;
2176 r_symndx = htab->r_sym (rel->r_info);
2177 if (r_symndx >= symtab_hdr->sh_info)
2179 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2180 while (h->root.type == bfd_link_hash_indirect
2181 || h->root.type == bfd_link_hash_warning)
2182 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2186 /* A local symbol. */
2187 Elf_Internal_Sym *isym;
2189 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2192 /* Check relocation against local STT_GNU_IFUNC symbol. */
2194 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2196 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2204 struct elf_x86_64_link_hash_entry *eh;
2205 struct elf_dyn_relocs **pp;
2206 struct elf_dyn_relocs *p;
2208 eh = (struct elf_x86_64_link_hash_entry *) h;
2210 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2213 /* Everything must go for SEC. */
2219 r_type = ELF32_R_TYPE (rel->r_info);
2220 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2221 symtab_hdr, sym_hashes,
2222 &r_type, GOT_UNKNOWN,
2223 rel, relend, h, r_symndx))
2228 case R_X86_64_TLSLD:
2229 if (htab->tls_ld_got.refcount > 0)
2230 htab->tls_ld_got.refcount -= 1;
2233 case R_X86_64_TLSGD:
2234 case R_X86_64_GOTPC32_TLSDESC:
2235 case R_X86_64_TLSDESC_CALL:
2236 case R_X86_64_GOTTPOFF:
2237 case R_X86_64_GOT32:
2238 case R_X86_64_GOTPCREL:
2239 case R_X86_64_GOT64:
2240 case R_X86_64_GOTPCREL64:
2241 case R_X86_64_GOTPLT64:
2244 if (h->got.refcount > 0)
2245 h->got.refcount -= 1;
2246 if (h->type == STT_GNU_IFUNC)
2248 if (h->plt.refcount > 0)
2249 h->plt.refcount -= 1;
2252 else if (local_got_refcounts != NULL)
2254 if (local_got_refcounts[r_symndx] > 0)
2255 local_got_refcounts[r_symndx] -= 1;
2267 case R_X86_64_PC32_BND:
2269 case R_X86_64_SIZE32:
2270 case R_X86_64_SIZE64:
2272 && (h == NULL || h->type != STT_GNU_IFUNC))
2276 case R_X86_64_PLT32:
2277 case R_X86_64_PLT32_BND:
2278 case R_X86_64_PLTOFF64:
2281 if (h->plt.refcount > 0)
2282 h->plt.refcount -= 1;
2294 /* Adjust a symbol defined by a dynamic object and referenced by a
2295 regular object. The current definition is in some section of the
2296 dynamic object, but we're not including those sections. We have to
2297 change the definition to something the rest of the link can
2301 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2302 struct elf_link_hash_entry *h)
2304 struct elf_x86_64_link_hash_table *htab;
2306 struct elf_x86_64_link_hash_entry *eh;
2307 struct elf_dyn_relocs *p;
2309 /* STT_GNU_IFUNC symbol must go through PLT. */
2310 if (h->type == STT_GNU_IFUNC)
2312 /* All local STT_GNU_IFUNC references must be treate as local
2313 calls via local PLT. */
2315 && SYMBOL_CALLS_LOCAL (info, h))
2317 bfd_size_type pc_count = 0, count = 0;
2318 struct elf_dyn_relocs **pp;
2320 eh = (struct elf_x86_64_link_hash_entry *) h;
2321 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2323 pc_count += p->pc_count;
2324 p->count -= p->pc_count;
2333 if (pc_count || count)
2337 if (h->plt.refcount <= 0)
2338 h->plt.refcount = 1;
2340 h->plt.refcount += 1;
2344 if (h->plt.refcount <= 0)
2346 h->plt.offset = (bfd_vma) -1;
2352 /* If this is a function, put it in the procedure linkage table. We
2353 will fill in the contents of the procedure linkage table later,
2354 when we know the address of the .got section. */
2355 if (h->type == STT_FUNC
2358 if (h->plt.refcount <= 0
2359 || SYMBOL_CALLS_LOCAL (info, h)
2360 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2361 && h->root.type == bfd_link_hash_undefweak))
2363 /* This case can occur if we saw a PLT32 reloc in an input
2364 file, but the symbol was never referred to by a dynamic
2365 object, or if all references were garbage collected. In
2366 such a case, we don't actually need to build a procedure
2367 linkage table, and we can just do a PC32 reloc instead. */
2368 h->plt.offset = (bfd_vma) -1;
2375 /* It's possible that we incorrectly decided a .plt reloc was
2376 needed for an R_X86_64_PC32 reloc to a non-function sym in
2377 check_relocs. We can't decide accurately between function and
2378 non-function syms in check-relocs; Objects loaded later in
2379 the link may change h->type. So fix it now. */
2380 h->plt.offset = (bfd_vma) -1;
2382 /* If this is a weak symbol, and there is a real definition, the
2383 processor independent code will have arranged for us to see the
2384 real definition first, and we can just use the same value. */
2385 if (h->u.weakdef != NULL)
2387 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2388 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2389 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2390 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2391 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2393 eh = (struct elf_x86_64_link_hash_entry *) h;
2394 h->non_got_ref = h->u.weakdef->non_got_ref;
2395 eh->needs_copy = h->u.weakdef->needs_copy;
2400 /* This is a reference to a symbol defined by a dynamic object which
2401 is not a function. */
2403 /* If we are creating a shared library, we must presume that the
2404 only references to the symbol are via the global offset table.
2405 For such cases we need not do anything here; the relocations will
2406 be handled correctly by relocate_section. */
2407 if (!info->executable)
2410 /* If there are no references to this symbol that do not use the
2411 GOT, we don't need to generate a copy reloc. */
2412 if (!h->non_got_ref)
2415 /* If -z nocopyreloc was given, we won't generate them either. */
2416 if (info->nocopyreloc)
2422 if (ELIMINATE_COPY_RELOCS)
2424 eh = (struct elf_x86_64_link_hash_entry *) h;
2425 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2427 s = p->sec->output_section;
2428 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2432 /* If we didn't find any dynamic relocs in read-only sections, then
2433 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2441 /* We must allocate the symbol in our .dynbss section, which will
2442 become part of the .bss section of the executable. There will be
2443 an entry for this symbol in the .dynsym section. The dynamic
2444 object will contain position independent code, so all references
2445 from the dynamic object to this symbol will go through the global
2446 offset table. The dynamic linker will use the .dynsym entry to
2447 determine the address it must put in the global offset table, so
2448 both the dynamic object and the regular object will refer to the
2449 same memory location for the variable. */
2451 htab = elf_x86_64_hash_table (info);
2455 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2456 to copy the initial value out of the dynamic object and into the
2457 runtime process image. */
2458 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2460 const struct elf_backend_data *bed;
2461 bed = get_elf_backend_data (info->output_bfd);
2462 htab->srelbss->size += bed->s->sizeof_rela;
2468 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2471 /* Allocate space in .plt, .got and associated reloc sections for
2475 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2477 struct bfd_link_info *info;
2478 struct elf_x86_64_link_hash_table *htab;
2479 struct elf_x86_64_link_hash_entry *eh;
2480 struct elf_dyn_relocs *p;
2481 const struct elf_backend_data *bed;
2482 unsigned int plt_entry_size;
2484 if (h->root.type == bfd_link_hash_indirect)
2487 eh = (struct elf_x86_64_link_hash_entry *) h;
2489 info = (struct bfd_link_info *) inf;
2490 htab = elf_x86_64_hash_table (info);
2493 bed = get_elf_backend_data (info->output_bfd);
2494 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2496 /* We can't use the GOT PLT if pointer equality is needed since
2497 finish_dynamic_symbol won't clear symbol value and the dynamic
2498 linker won't update the GOT slot. We will get into an infinite
2499 loop at run-time. */
2500 if (htab->plt_got != NULL
2501 && h->type != STT_GNU_IFUNC
2502 && !h->pointer_equality_needed
2503 && h->plt.refcount > 0
2504 && h->got.refcount > 0)
2506 /* Don't use the regular PLT if there are both GOT and GOTPLT
2508 h->plt.offset = (bfd_vma) -1;
2510 /* Use the GOT PLT. */
2511 eh->plt_got.refcount = 1;
2514 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2515 here if it is defined and referenced in a non-shared object. */
2516 if (h->type == STT_GNU_IFUNC
2519 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2525 asection *s = htab->plt_bnd;
2526 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2528 /* Use the .plt.bnd section if it is created. */
2529 eh->plt_bnd.offset = s->size;
2531 /* Make room for this entry in the .plt.bnd section. */
2532 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2540 else if (htab->elf.dynamic_sections_created
2541 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2543 bfd_boolean use_plt_got;
2545 if ((info->flags & DF_BIND_NOW))
2547 /* Don't use the regular PLT for DF_BIND_NOW. */
2548 h->plt.offset = (bfd_vma) -1;
2550 /* Use the GOT PLT. */
2551 h->got.refcount = 1;
2552 eh->plt_got.refcount = 1;
2555 use_plt_got = eh->plt_got.refcount > 0;
2557 /* Make sure this symbol is output as a dynamic symbol.
2558 Undefined weak syms won't yet be marked as dynamic. */
2559 if (h->dynindx == -1
2560 && !h->forced_local)
2562 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2567 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2569 asection *s = htab->elf.splt;
2570 asection *bnd_s = htab->plt_bnd;
2571 asection *got_s = htab->plt_got;
2574 eh->plt_got.offset = got_s->size;
2577 /* If this is the first .plt entry, make room for the
2578 special first entry. */
2580 s->size = plt_entry_size;
2581 h->plt.offset = s->size;
2583 eh->plt_bnd.offset = bnd_s->size;
2586 /* If this symbol is not defined in a regular file, and we are
2587 not generating a shared library, then set the symbol to this
2588 location in the .plt. This is required to make function
2589 pointers compare as equal between the normal executable and
2590 the shared library. */
2596 /* We need to make a call to the entry of the GOT PLT
2597 instead of regular PLT entry. */
2598 h->root.u.def.section = got_s;
2599 h->root.u.def.value = eh->plt_got.offset;
2605 /* We need to make a call to the entry of the second
2606 PLT instead of regular PLT entry. */
2607 h->root.u.def.section = bnd_s;
2608 h->root.u.def.value = eh->plt_bnd.offset;
2612 h->root.u.def.section = s;
2613 h->root.u.def.value = h->plt.offset;
2618 /* Make room for this entry. */
2620 got_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2623 s->size += plt_entry_size;
2625 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2627 /* We also need to make an entry in the .got.plt section,
2628 which will be placed in the .got section by the linker
2630 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2632 /* We also need to make an entry in the .rela.plt
2634 htab->elf.srelplt->size += bed->s->sizeof_rela;
2635 htab->elf.srelplt->reloc_count++;
2640 h->plt.offset = (bfd_vma) -1;
2646 h->plt.offset = (bfd_vma) -1;
2650 eh->tlsdesc_got = (bfd_vma) -1;
2652 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2653 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2654 if (h->got.refcount > 0
2657 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2659 h->got.offset = (bfd_vma) -1;
2661 else if (h->got.refcount > 0)
2665 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2667 /* Make sure this symbol is output as a dynamic symbol.
2668 Undefined weak syms won't yet be marked as dynamic. */
2669 if (h->dynindx == -1
2670 && !h->forced_local)
2672 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2676 if (GOT_TLS_GDESC_P (tls_type))
2678 eh->tlsdesc_got = htab->elf.sgotplt->size
2679 - elf_x86_64_compute_jump_table_size (htab);
2680 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2681 h->got.offset = (bfd_vma) -2;
2683 if (! GOT_TLS_GDESC_P (tls_type)
2684 || GOT_TLS_GD_P (tls_type))
2687 h->got.offset = s->size;
2688 s->size += GOT_ENTRY_SIZE;
2689 if (GOT_TLS_GD_P (tls_type))
2690 s->size += GOT_ENTRY_SIZE;
2692 dyn = htab->elf.dynamic_sections_created;
2693 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2695 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2696 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2697 || tls_type == GOT_TLS_IE)
2698 htab->elf.srelgot->size += bed->s->sizeof_rela;
2699 else if (GOT_TLS_GD_P (tls_type))
2700 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2701 else if (! GOT_TLS_GDESC_P (tls_type)
2702 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2703 || h->root.type != bfd_link_hash_undefweak)
2705 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2706 htab->elf.srelgot->size += bed->s->sizeof_rela;
2707 if (GOT_TLS_GDESC_P (tls_type))
2709 htab->elf.srelplt->size += bed->s->sizeof_rela;
2710 htab->tlsdesc_plt = (bfd_vma) -1;
2714 h->got.offset = (bfd_vma) -1;
2716 if (eh->dyn_relocs == NULL)
2719 /* In the shared -Bsymbolic case, discard space allocated for
2720 dynamic pc-relative relocs against symbols which turn out to be
2721 defined in regular objects. For the normal shared case, discard
2722 space for pc-relative relocs that have become local due to symbol
2723 visibility changes. */
2727 /* Relocs that use pc_count are those that appear on a call
2728 insn, or certain REL relocs that can generated via assembly.
2729 We want calls to protected symbols to resolve directly to the
2730 function rather than going via the plt. If people want
2731 function pointer comparisons to work as expected then they
2732 should avoid writing weird assembly. */
2733 if (SYMBOL_CALLS_LOCAL (info, h))
2735 struct elf_dyn_relocs **pp;
2737 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2739 p->count -= p->pc_count;
2748 /* Also discard relocs on undefined weak syms with non-default
2750 if (eh->dyn_relocs != NULL)
2752 if (h->root.type == bfd_link_hash_undefweak)
2754 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2755 eh->dyn_relocs = NULL;
2757 /* Make sure undefined weak symbols are output as a dynamic
2759 else if (h->dynindx == -1
2760 && ! h->forced_local
2761 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2764 /* For PIE, discard space for pc-relative relocs against
2765 symbols which turn out to need copy relocs. */
2766 else if (info->executable
2767 && (h->needs_copy || eh->needs_copy)
2771 struct elf_dyn_relocs **pp;
2773 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2775 if (p->pc_count != 0)
2783 else if (ELIMINATE_COPY_RELOCS)
2785 /* For the non-shared case, discard space for relocs against
2786 symbols which turn out to need copy relocs or are not
2792 || (htab->elf.dynamic_sections_created
2793 && (h->root.type == bfd_link_hash_undefweak
2794 || h->root.type == bfd_link_hash_undefined))))
2796 /* Make sure this symbol is output as a dynamic symbol.
2797 Undefined weak syms won't yet be marked as dynamic. */
2798 if (h->dynindx == -1
2799 && ! h->forced_local
2800 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2803 /* If that succeeded, we know we'll be keeping all the
2805 if (h->dynindx != -1)
2809 eh->dyn_relocs = NULL;
2814 /* Finally, allocate space. */
2815 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2819 sreloc = elf_section_data (p->sec)->sreloc;
2821 BFD_ASSERT (sreloc != NULL);
2823 sreloc->size += p->count * bed->s->sizeof_rela;
2829 /* Allocate space in .plt, .got and associated reloc sections for
2830 local dynamic relocs. */
2833 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2835 struct elf_link_hash_entry *h
2836 = (struct elf_link_hash_entry *) *slot;
2838 if (h->type != STT_GNU_IFUNC
2842 || h->root.type != bfd_link_hash_defined)
2845 return elf_x86_64_allocate_dynrelocs (h, inf);
2848 /* Find any dynamic relocs that apply to read-only sections. */
2851 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2854 struct elf_x86_64_link_hash_entry *eh;
2855 struct elf_dyn_relocs *p;
2857 /* Skip local IFUNC symbols. */
2858 if (h->forced_local && h->type == STT_GNU_IFUNC)
2861 eh = (struct elf_x86_64_link_hash_entry *) h;
2862 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2864 asection *s = p->sec->output_section;
2866 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2868 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2870 info->flags |= DF_TEXTREL;
2872 if ((info->warn_shared_textrel && info->shared)
2873 || info->error_textrel)
2874 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2875 p->sec->owner, h->root.root.string,
2878 /* Not an error, just cut short the traversal. */
2886 mov foo@GOTPCREL(%rip), %reg
2889 with the local symbol, foo. */
2892 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2893 struct bfd_link_info *link_info)
2895 Elf_Internal_Shdr *symtab_hdr;
2896 Elf_Internal_Rela *internal_relocs;
2897 Elf_Internal_Rela *irel, *irelend;
2899 struct elf_x86_64_link_hash_table *htab;
2900 bfd_boolean changed_contents;
2901 bfd_boolean changed_relocs;
2902 bfd_signed_vma *local_got_refcounts;
2904 /* Don't even try to convert non-ELF outputs. */
2905 if (!is_elf_hash_table (link_info->hash))
2908 /* Nothing to do if there is no need or no output. */
2909 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2910 || sec->need_convert_mov_to_lea == 0
2911 || bfd_is_abs_section (sec->output_section))
2914 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2916 /* Load the relocations for this section. */
2917 internal_relocs = (_bfd_elf_link_read_relocs
2918 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2919 link_info->keep_memory));
2920 if (internal_relocs == NULL)
2923 htab = elf_x86_64_hash_table (link_info);
2924 changed_contents = FALSE;
2925 changed_relocs = FALSE;
2926 local_got_refcounts = elf_local_got_refcounts (abfd);
2928 /* Get the section contents. */
2929 if (elf_section_data (sec)->this_hdr.contents != NULL)
2930 contents = elf_section_data (sec)->this_hdr.contents;
2933 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2937 irelend = internal_relocs + sec->reloc_count;
2938 for (irel = internal_relocs; irel < irelend; irel++)
2940 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2941 unsigned int r_symndx = htab->r_sym (irel->r_info);
2943 struct elf_link_hash_entry *h;
2945 if (r_type != R_X86_64_GOTPCREL)
2948 /* Get the symbol referred to by the reloc. */
2949 if (r_symndx < symtab_hdr->sh_info)
2951 Elf_Internal_Sym *isym;
2953 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2956 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2957 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2958 && irel->r_offset >= 2
2959 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2961 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2962 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2963 if (local_got_refcounts != NULL
2964 && local_got_refcounts[r_symndx] > 0)
2965 local_got_refcounts[r_symndx] -= 1;
2966 changed_contents = TRUE;
2967 changed_relocs = TRUE;
2972 indx = r_symndx - symtab_hdr->sh_info;
2973 h = elf_sym_hashes (abfd)[indx];
2974 BFD_ASSERT (h != NULL);
2976 while (h->root.type == bfd_link_hash_indirect
2977 || h->root.type == bfd_link_hash_warning)
2978 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2980 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2981 avoid optimizing _DYNAMIC since ld.so may use its link-time
2984 && h->type != STT_GNU_IFUNC
2985 && h != htab->elf.hdynamic
2986 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2987 && irel->r_offset >= 2
2988 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2990 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2991 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2992 if (h->got.refcount > 0)
2993 h->got.refcount -= 1;
2994 changed_contents = TRUE;
2995 changed_relocs = TRUE;
2999 if (contents != NULL
3000 && elf_section_data (sec)->this_hdr.contents != contents)
3002 if (!changed_contents && !link_info->keep_memory)
3006 /* Cache the section contents for elf_link_input_bfd. */
3007 elf_section_data (sec)->this_hdr.contents = contents;
3011 if (elf_section_data (sec)->relocs != internal_relocs)
3013 if (!changed_relocs)
3014 free (internal_relocs);
3016 elf_section_data (sec)->relocs = internal_relocs;
3022 if (contents != NULL
3023 && elf_section_data (sec)->this_hdr.contents != contents)
3025 if (internal_relocs != NULL
3026 && elf_section_data (sec)->relocs != internal_relocs)
3027 free (internal_relocs);
3031 /* Set the sizes of the dynamic sections. */
3034 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3035 struct bfd_link_info *info)
3037 struct elf_x86_64_link_hash_table *htab;
3042 const struct elf_backend_data *bed;
3044 htab = elf_x86_64_hash_table (info);
3047 bed = get_elf_backend_data (output_bfd);
3049 dynobj = htab->elf.dynobj;
3053 if (htab->elf.dynamic_sections_created)
3055 /* Set the contents of the .interp section to the interpreter. */
3056 if (info->executable)
3058 s = bfd_get_linker_section (dynobj, ".interp");
3061 s->size = htab->dynamic_interpreter_size;
3062 s->contents = (unsigned char *) htab->dynamic_interpreter;
3066 /* Set up .got offsets for local syms, and space for local dynamic
3068 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3070 bfd_signed_vma *local_got;
3071 bfd_signed_vma *end_local_got;
3072 char *local_tls_type;
3073 bfd_vma *local_tlsdesc_gotent;
3074 bfd_size_type locsymcount;
3075 Elf_Internal_Shdr *symtab_hdr;
3078 if (! is_x86_64_elf (ibfd))
3081 for (s = ibfd->sections; s != NULL; s = s->next)
3083 struct elf_dyn_relocs *p;
3085 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
3088 for (p = (struct elf_dyn_relocs *)
3089 (elf_section_data (s)->local_dynrel);
3093 if (!bfd_is_abs_section (p->sec)
3094 && bfd_is_abs_section (p->sec->output_section))
3096 /* Input section has been discarded, either because
3097 it is a copy of a linkonce section or due to
3098 linker script /DISCARD/, so we'll be discarding
3101 else if (p->count != 0)
3103 srel = elf_section_data (p->sec)->sreloc;
3104 srel->size += p->count * bed->s->sizeof_rela;
3105 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3106 && (info->flags & DF_TEXTREL) == 0)
3108 info->flags |= DF_TEXTREL;
3109 if ((info->warn_shared_textrel && info->shared)
3110 || info->error_textrel)
3111 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3112 p->sec->owner, p->sec);
3118 local_got = elf_local_got_refcounts (ibfd);
3122 symtab_hdr = &elf_symtab_hdr (ibfd);
3123 locsymcount = symtab_hdr->sh_info;
3124 end_local_got = local_got + locsymcount;
3125 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3126 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3128 srel = htab->elf.srelgot;
3129 for (; local_got < end_local_got;
3130 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3132 *local_tlsdesc_gotent = (bfd_vma) -1;
3135 if (GOT_TLS_GDESC_P (*local_tls_type))
3137 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3138 - elf_x86_64_compute_jump_table_size (htab);
3139 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3140 *local_got = (bfd_vma) -2;
3142 if (! GOT_TLS_GDESC_P (*local_tls_type)
3143 || GOT_TLS_GD_P (*local_tls_type))
3145 *local_got = s->size;
3146 s->size += GOT_ENTRY_SIZE;
3147 if (GOT_TLS_GD_P (*local_tls_type))
3148 s->size += GOT_ENTRY_SIZE;
3151 || GOT_TLS_GD_ANY_P (*local_tls_type)
3152 || *local_tls_type == GOT_TLS_IE)
3154 if (GOT_TLS_GDESC_P (*local_tls_type))
3156 htab->elf.srelplt->size
3157 += bed->s->sizeof_rela;
3158 htab->tlsdesc_plt = (bfd_vma) -1;
3160 if (! GOT_TLS_GDESC_P (*local_tls_type)
3161 || GOT_TLS_GD_P (*local_tls_type))
3162 srel->size += bed->s->sizeof_rela;
3166 *local_got = (bfd_vma) -1;
3170 if (htab->tls_ld_got.refcount > 0)
3172 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3174 htab->tls_ld_got.offset = htab->elf.sgot->size;
3175 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3176 htab->elf.srelgot->size += bed->s->sizeof_rela;
3179 htab->tls_ld_got.offset = -1;
3181 /* Allocate global sym .plt and .got entries, and space for global
3182 sym dynamic relocs. */
3183 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3186 /* Allocate .plt and .got entries, and space for local symbols. */
3187 htab_traverse (htab->loc_hash_table,
3188 elf_x86_64_allocate_local_dynrelocs,
3191 /* For every jump slot reserved in the sgotplt, reloc_count is
3192 incremented. However, when we reserve space for TLS descriptors,
3193 it's not incremented, so in order to compute the space reserved
3194 for them, it suffices to multiply the reloc count by the jump
3197 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3198 so that R_X86_64_IRELATIVE entries come last. */
3199 if (htab->elf.srelplt)
3201 htab->sgotplt_jump_table_size
3202 = elf_x86_64_compute_jump_table_size (htab);
3203 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3205 else if (htab->elf.irelplt)
3206 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3208 if (htab->tlsdesc_plt)
3210 /* If we're not using lazy TLS relocations, don't generate the
3211 PLT and GOT entries they require. */
3212 if ((info->flags & DF_BIND_NOW))
3213 htab->tlsdesc_plt = 0;
3216 htab->tlsdesc_got = htab->elf.sgot->size;
3217 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3218 /* Reserve room for the initial entry.
3219 FIXME: we could probably do away with it in this case. */
3220 if (htab->elf.splt->size == 0)
3221 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3222 htab->tlsdesc_plt = htab->elf.splt->size;
3223 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3227 if (htab->elf.sgotplt)
3229 /* Don't allocate .got.plt section if there are no GOT nor PLT
3230 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3231 if ((htab->elf.hgot == NULL
3232 || !htab->elf.hgot->ref_regular_nonweak)
3233 && (htab->elf.sgotplt->size
3234 == get_elf_backend_data (output_bfd)->got_header_size)
3235 && (htab->elf.splt == NULL
3236 || htab->elf.splt->size == 0)
3237 && (htab->elf.sgot == NULL
3238 || htab->elf.sgot->size == 0)
3239 && (htab->elf.iplt == NULL
3240 || htab->elf.iplt->size == 0)
3241 && (htab->elf.igotplt == NULL
3242 || htab->elf.igotplt->size == 0))
3243 htab->elf.sgotplt->size = 0;
3246 if (htab->plt_eh_frame != NULL
3247 && htab->elf.splt != NULL
3248 && htab->elf.splt->size != 0
3249 && !bfd_is_abs_section (htab->elf.splt->output_section)
3250 && _bfd_elf_eh_frame_present (info))
3252 const struct elf_x86_64_backend_data *arch_data
3253 = get_elf_x86_64_arch_data (bed);
3254 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3257 /* We now have determined the sizes of the various dynamic sections.
3258 Allocate memory for them. */
3260 for (s = dynobj->sections; s != NULL; s = s->next)
3262 if ((s->flags & SEC_LINKER_CREATED) == 0)
3265 if (s == htab->elf.splt
3266 || s == htab->elf.sgot
3267 || s == htab->elf.sgotplt
3268 || s == htab->elf.iplt
3269 || s == htab->elf.igotplt
3270 || s == htab->plt_bnd
3271 || s == htab->plt_got
3272 || s == htab->plt_eh_frame
3273 || s == htab->sdynbss)
3275 /* Strip this section if we don't need it; see the
3278 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3280 if (s->size != 0 && s != htab->elf.srelplt)
3283 /* We use the reloc_count field as a counter if we need
3284 to copy relocs into the output file. */
3285 if (s != htab->elf.srelplt)
3290 /* It's not one of our sections, so don't allocate space. */
3296 /* If we don't need this section, strip it from the
3297 output file. This is mostly to handle .rela.bss and
3298 .rela.plt. We must create both sections in
3299 create_dynamic_sections, because they must be created
3300 before the linker maps input sections to output
3301 sections. The linker does that before
3302 adjust_dynamic_symbol is called, and it is that
3303 function which decides whether anything needs to go
3304 into these sections. */
3306 s->flags |= SEC_EXCLUDE;
3310 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3313 /* Allocate memory for the section contents. We use bfd_zalloc
3314 here in case unused entries are not reclaimed before the
3315 section's contents are written out. This should not happen,
3316 but this way if it does, we get a R_X86_64_NONE reloc instead
3318 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3319 if (s->contents == NULL)
3323 if (htab->plt_eh_frame != NULL
3324 && htab->plt_eh_frame->contents != NULL)
3326 const struct elf_x86_64_backend_data *arch_data
3327 = get_elf_x86_64_arch_data (bed);
3329 memcpy (htab->plt_eh_frame->contents,
3330 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3331 bfd_put_32 (dynobj, htab->elf.splt->size,
3332 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3335 if (htab->elf.dynamic_sections_created)
3337 /* Add some entries to the .dynamic section. We fill in the
3338 values later, in elf_x86_64_finish_dynamic_sections, but we
3339 must add the entries now so that we get the correct size for
3340 the .dynamic section. The DT_DEBUG entry is filled in by the
3341 dynamic linker and used by the debugger. */
3342 #define add_dynamic_entry(TAG, VAL) \
3343 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3345 if (info->executable)
3347 if (!add_dynamic_entry (DT_DEBUG, 0))
3351 if (htab->elf.splt->size != 0)
3353 if (!add_dynamic_entry (DT_PLTGOT, 0)
3354 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3355 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3356 || !add_dynamic_entry (DT_JMPREL, 0))
3359 if (htab->tlsdesc_plt
3360 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3361 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3367 if (!add_dynamic_entry (DT_RELA, 0)
3368 || !add_dynamic_entry (DT_RELASZ, 0)
3369 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3372 /* If any dynamic relocs apply to a read-only section,
3373 then we need a DT_TEXTREL entry. */
3374 if ((info->flags & DF_TEXTREL) == 0)
3375 elf_link_hash_traverse (&htab->elf,
3376 elf_x86_64_readonly_dynrelocs,
3379 if ((info->flags & DF_TEXTREL) != 0)
3381 if (!add_dynamic_entry (DT_TEXTREL, 0))
3386 #undef add_dynamic_entry
3392 elf_x86_64_always_size_sections (bfd *output_bfd,
3393 struct bfd_link_info *info)
3395 asection *tls_sec = elf_hash_table (info)->tls_sec;
3399 struct elf_link_hash_entry *tlsbase;
3401 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3402 "_TLS_MODULE_BASE_",
3403 FALSE, FALSE, FALSE);
3405 if (tlsbase && tlsbase->type == STT_TLS)
3407 struct elf_x86_64_link_hash_table *htab;
3408 struct bfd_link_hash_entry *bh = NULL;
3409 const struct elf_backend_data *bed
3410 = get_elf_backend_data (output_bfd);
3412 htab = elf_x86_64_hash_table (info);
3416 if (!(_bfd_generic_link_add_one_symbol
3417 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3418 tls_sec, 0, NULL, FALSE,
3419 bed->collect, &bh)))
3422 htab->tls_module_base = bh;
3424 tlsbase = (struct elf_link_hash_entry *)bh;
3425 tlsbase->def_regular = 1;
3426 tlsbase->other = STV_HIDDEN;
3427 tlsbase->root.linker_def = 1;
3428 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3435 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3436 executables. Rather than setting it to the beginning of the TLS
3437 section, we have to set it to the end. This function may be called
3438 multiple times, it is idempotent. */
3441 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3443 struct elf_x86_64_link_hash_table *htab;
3444 struct bfd_link_hash_entry *base;
3446 if (!info->executable)
3449 htab = elf_x86_64_hash_table (info);
3453 base = htab->tls_module_base;
3457 base->u.def.value = htab->elf.tls_size;
3460 /* Return the base VMA address which should be subtracted from real addresses
3461 when resolving @dtpoff relocation.
3462 This is PT_TLS segment p_vaddr. */
3465 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3467 /* If tls_sec is NULL, we should have signalled an error already. */
3468 if (elf_hash_table (info)->tls_sec == NULL)
3470 return elf_hash_table (info)->tls_sec->vma;
3473 /* Return the relocation value for @tpoff relocation
3474 if STT_TLS virtual address is ADDRESS. */
3477 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3479 struct elf_link_hash_table *htab = elf_hash_table (info);
3480 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3481 bfd_vma static_tls_size;
3483 /* If tls_segment is NULL, we should have signalled an error already. */
3484 if (htab->tls_sec == NULL)
3487 /* Consider special static TLS alignment requirements. */
3488 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3489 return address - static_tls_size - htab->tls_sec->vma;
3492 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3496 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3498 /* Opcode Instruction
3501 0x0f 0x8x conditional jump */
3503 && (contents [offset - 1] == 0xe8
3504 || contents [offset - 1] == 0xe9))
3506 && contents [offset - 2] == 0x0f
3507 && (contents [offset - 1] & 0xf0) == 0x80));
3510 /* Relocate an x86_64 ELF section. */
3513 elf_x86_64_relocate_section (bfd *output_bfd,
3514 struct bfd_link_info *info,
3516 asection *input_section,
3518 Elf_Internal_Rela *relocs,
3519 Elf_Internal_Sym *local_syms,
3520 asection **local_sections)
3522 struct elf_x86_64_link_hash_table *htab;
3523 Elf_Internal_Shdr *symtab_hdr;
3524 struct elf_link_hash_entry **sym_hashes;
3525 bfd_vma *local_got_offsets;
3526 bfd_vma *local_tlsdesc_gotents;
3527 Elf_Internal_Rela *rel;
3528 Elf_Internal_Rela *relend;
3529 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3531 BFD_ASSERT (is_x86_64_elf (input_bfd));
3533 htab = elf_x86_64_hash_table (info);
3536 symtab_hdr = &elf_symtab_hdr (input_bfd);
3537 sym_hashes = elf_sym_hashes (input_bfd);
3538 local_got_offsets = elf_local_got_offsets (input_bfd);
3539 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3541 elf_x86_64_set_tls_module_base (info);
3544 relend = relocs + input_section->reloc_count;
3545 for (; rel < relend; rel++)
3547 unsigned int r_type;
3548 reloc_howto_type *howto;
3549 unsigned long r_symndx;
3550 struct elf_link_hash_entry *h;
3551 struct elf_x86_64_link_hash_entry *eh;
3552 Elf_Internal_Sym *sym;
3554 bfd_vma off, offplt, plt_offset;
3556 bfd_boolean unresolved_reloc;
3557 bfd_reloc_status_type r;
3559 asection *base_got, *resolved_plt;
3562 r_type = ELF32_R_TYPE (rel->r_info);
3563 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3564 || r_type == (int) R_X86_64_GNU_VTENTRY)
3567 if (r_type >= (int) R_X86_64_standard)
3569 (*_bfd_error_handler)
3570 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3571 input_bfd, input_section, r_type);
3572 bfd_set_error (bfd_error_bad_value);
3576 if (r_type != (int) R_X86_64_32
3577 || ABI_64_P (output_bfd))
3578 howto = x86_64_elf_howto_table + r_type;
3580 howto = (x86_64_elf_howto_table
3581 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3582 r_symndx = htab->r_sym (rel->r_info);
3586 unresolved_reloc = FALSE;
3587 if (r_symndx < symtab_hdr->sh_info)
3589 sym = local_syms + r_symndx;
3590 sec = local_sections[r_symndx];
3592 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3594 st_size = sym->st_size;
3596 /* Relocate against local STT_GNU_IFUNC symbol. */
3597 if (!info->relocatable
3598 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3600 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3605 /* Set STT_GNU_IFUNC symbol value. */
3606 h->root.u.def.value = sym->st_value;
3607 h->root.u.def.section = sec;
3612 bfd_boolean warned ATTRIBUTE_UNUSED;
3613 bfd_boolean ignored ATTRIBUTE_UNUSED;
3615 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3616 r_symndx, symtab_hdr, sym_hashes,
3618 unresolved_reloc, warned, ignored);
3622 if (sec != NULL && discarded_section (sec))
3623 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3624 rel, 1, relend, howto, 0, contents);
3626 if (info->relocatable)
3629 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3631 if (r_type == R_X86_64_64)
3633 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3634 zero-extend it to 64bit if addend is zero. */
3635 r_type = R_X86_64_32;
3636 memset (contents + rel->r_offset + 4, 0, 4);
3638 else if (r_type == R_X86_64_SIZE64)
3640 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3641 zero-extend it to 64bit if addend is zero. */
3642 r_type = R_X86_64_SIZE32;
3643 memset (contents + rel->r_offset + 4, 0, 4);
3647 eh = (struct elf_x86_64_link_hash_entry *) h;
3649 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3650 it here if it is defined in a non-shared object. */
3652 && h->type == STT_GNU_IFUNC
3658 if ((input_section->flags & SEC_ALLOC) == 0
3659 || h->plt.offset == (bfd_vma) -1)
3662 /* STT_GNU_IFUNC symbol must go through PLT. */
3663 if (htab->elf.splt != NULL)
3665 if (htab->plt_bnd != NULL)
3667 resolved_plt = htab->plt_bnd;
3668 plt_offset = eh->plt_bnd.offset;
3672 resolved_plt = htab->elf.splt;
3673 plt_offset = h->plt.offset;
3678 resolved_plt = htab->elf.iplt;
3679 plt_offset = h->plt.offset;
3682 relocation = (resolved_plt->output_section->vma
3683 + resolved_plt->output_offset + plt_offset);
3688 if (h->root.root.string)
3689 name = h->root.root.string;
3691 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3693 (*_bfd_error_handler)
3694 (_("%B: relocation %s against STT_GNU_IFUNC "
3695 "symbol `%s' isn't handled by %s"), input_bfd,
3696 x86_64_elf_howto_table[r_type].name,
3697 name, __FUNCTION__);
3698 bfd_set_error (bfd_error_bad_value);
3707 if (ABI_64_P (output_bfd))
3711 if (rel->r_addend != 0)
3713 if (h->root.root.string)
3714 name = h->root.root.string;
3716 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3718 (*_bfd_error_handler)
3719 (_("%B: relocation %s against STT_GNU_IFUNC "
3720 "symbol `%s' has non-zero addend: %d"),
3721 input_bfd, x86_64_elf_howto_table[r_type].name,
3722 name, rel->r_addend);
3723 bfd_set_error (bfd_error_bad_value);
3727 /* Generate dynamic relcoation only when there is a
3728 non-GOT reference in a shared object. */
3729 if (info->shared && h->non_got_ref)
3731 Elf_Internal_Rela outrel;
3734 /* Need a dynamic relocation to get the real function
3736 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3740 if (outrel.r_offset == (bfd_vma) -1
3741 || outrel.r_offset == (bfd_vma) -2)
3744 outrel.r_offset += (input_section->output_section->vma
3745 + input_section->output_offset);
3747 if (h->dynindx == -1
3749 || info->executable)
3751 /* This symbol is resolved locally. */
3752 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3753 outrel.r_addend = (h->root.u.def.value
3754 + h->root.u.def.section->output_section->vma
3755 + h->root.u.def.section->output_offset);
3759 outrel.r_info = htab->r_info (h->dynindx, r_type);
3760 outrel.r_addend = 0;
3763 sreloc = htab->elf.irelifunc;
3764 elf_append_rela (output_bfd, sreloc, &outrel);
3766 /* If this reloc is against an external symbol, we
3767 do not want to fiddle with the addend. Otherwise,
3768 we need to include the symbol value so that it
3769 becomes an addend for the dynamic reloc. For an
3770 internal symbol, we have updated addend. */
3775 case R_X86_64_PC32_BND:
3777 case R_X86_64_PLT32:
3778 case R_X86_64_PLT32_BND:
3781 case R_X86_64_GOTPCREL:
3782 case R_X86_64_GOTPCREL64:
3783 base_got = htab->elf.sgot;
3784 off = h->got.offset;
3786 if (base_got == NULL)
3789 if (off == (bfd_vma) -1)
3791 /* We can't use h->got.offset here to save state, or
3792 even just remember the offset, as finish_dynamic_symbol
3793 would use that as offset into .got. */
3795 if (htab->elf.splt != NULL)
3797 plt_index = h->plt.offset / plt_entry_size - 1;
3798 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3799 base_got = htab->elf.sgotplt;
3803 plt_index = h->plt.offset / plt_entry_size;
3804 off = plt_index * GOT_ENTRY_SIZE;
3805 base_got = htab->elf.igotplt;
3808 if (h->dynindx == -1
3812 /* This references the local defitionion. We must
3813 initialize this entry in the global offset table.
3814 Since the offset must always be a multiple of 8,
3815 we use the least significant bit to record
3816 whether we have initialized it already.
3818 When doing a dynamic link, we create a .rela.got
3819 relocation entry to initialize the value. This
3820 is done in the finish_dynamic_symbol routine. */
3825 bfd_put_64 (output_bfd, relocation,
3826 base_got->contents + off);
3827 /* Note that this is harmless for the GOTPLT64
3828 case, as -1 | 1 still is -1. */
3834 relocation = (base_got->output_section->vma
3835 + base_got->output_offset + off);
3841 /* When generating a shared object, the relocations handled here are
3842 copied into the output file to be resolved at run time. */
3845 case R_X86_64_GOT32:
3846 case R_X86_64_GOT64:
3847 /* Relocation is to the entry for this symbol in the global
3849 case R_X86_64_GOTPCREL:
3850 case R_X86_64_GOTPCREL64:
3851 /* Use global offset table entry as symbol value. */
3852 case R_X86_64_GOTPLT64:
3853 /* This is obsolete and treated the the same as GOT64. */
3854 base_got = htab->elf.sgot;
3856 if (htab->elf.sgot == NULL)
3863 off = h->got.offset;
3865 && h->plt.offset != (bfd_vma)-1
3866 && off == (bfd_vma)-1)
3868 /* We can't use h->got.offset here to save
3869 state, or even just remember the offset, as
3870 finish_dynamic_symbol would use that as offset into
3872 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3873 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3874 base_got = htab->elf.sgotplt;
3877 dyn = htab->elf.dynamic_sections_created;
3879 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3881 && SYMBOL_REFERENCES_LOCAL (info, h))
3882 || (ELF_ST_VISIBILITY (h->other)
3883 && h->root.type == bfd_link_hash_undefweak))
3885 /* This is actually a static link, or it is a -Bsymbolic
3886 link and the symbol is defined locally, or the symbol
3887 was forced to be local because of a version file. We
3888 must initialize this entry in the global offset table.
3889 Since the offset must always be a multiple of 8, we
3890 use the least significant bit to record whether we
3891 have initialized it already.
3893 When doing a dynamic link, we create a .rela.got
3894 relocation entry to initialize the value. This is
3895 done in the finish_dynamic_symbol routine. */
3900 bfd_put_64 (output_bfd, relocation,
3901 base_got->contents + off);
3902 /* Note that this is harmless for the GOTPLT64 case,
3903 as -1 | 1 still is -1. */
3908 unresolved_reloc = FALSE;
3912 if (local_got_offsets == NULL)
3915 off = local_got_offsets[r_symndx];
3917 /* The offset must always be a multiple of 8. We use
3918 the least significant bit to record whether we have
3919 already generated the necessary reloc. */
3924 bfd_put_64 (output_bfd, relocation,
3925 base_got->contents + off);
3930 Elf_Internal_Rela outrel;
3932 /* We need to generate a R_X86_64_RELATIVE reloc
3933 for the dynamic linker. */
3934 s = htab->elf.srelgot;
3938 outrel.r_offset = (base_got->output_section->vma
3939 + base_got->output_offset
3941 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3942 outrel.r_addend = relocation;
3943 elf_append_rela (output_bfd, s, &outrel);
3946 local_got_offsets[r_symndx] |= 1;
3950 if (off >= (bfd_vma) -2)
3953 relocation = base_got->output_section->vma
3954 + base_got->output_offset + off;
3955 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3956 relocation -= htab->elf.sgotplt->output_section->vma
3957 - htab->elf.sgotplt->output_offset;
3961 case R_X86_64_GOTOFF64:
3962 /* Relocation is relative to the start of the global offset
3965 /* Check to make sure it isn't a protected function or data
3966 symbol for shared library since it may not be local when
3967 used as function address or with copy relocation. We also
3968 need to make sure that a symbol is referenced locally. */
3969 if (info->shared && h)
3971 if (!h->def_regular)
3975 switch (ELF_ST_VISIBILITY (h->other))
3978 v = _("hidden symbol");
3981 v = _("internal symbol");
3984 v = _("protected symbol");
3991 (*_bfd_error_handler)
3992 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
3993 input_bfd, v, h->root.root.string);
3994 bfd_set_error (bfd_error_bad_value);
3997 else if (!info->executable
3998 && !SYMBOL_REFERENCES_LOCAL (info, h)
3999 && (h->type == STT_FUNC
4000 || h->type == STT_OBJECT)
4001 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4003 (*_bfd_error_handler)
4004 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4006 h->type == STT_FUNC ? "function" : "data",
4007 h->root.root.string);
4008 bfd_set_error (bfd_error_bad_value);
4013 /* Note that sgot is not involved in this
4014 calculation. We always want the start of .got.plt. If we
4015 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4016 permitted by the ABI, we might have to change this
4018 relocation -= htab->elf.sgotplt->output_section->vma
4019 + htab->elf.sgotplt->output_offset;
4022 case R_X86_64_GOTPC32:
4023 case R_X86_64_GOTPC64:
4024 /* Use global offset table as symbol value. */
4025 relocation = htab->elf.sgotplt->output_section->vma
4026 + htab->elf.sgotplt->output_offset;
4027 unresolved_reloc = FALSE;
4030 case R_X86_64_PLTOFF64:
4031 /* Relocation is PLT entry relative to GOT. For local
4032 symbols it's the symbol itself relative to GOT. */
4034 /* See PLT32 handling. */
4035 && h->plt.offset != (bfd_vma) -1
4036 && htab->elf.splt != NULL)
4038 if (htab->plt_bnd != NULL)
4040 resolved_plt = htab->plt_bnd;
4041 plt_offset = eh->plt_bnd.offset;
4045 resolved_plt = htab->elf.splt;
4046 plt_offset = h->plt.offset;
4049 relocation = (resolved_plt->output_section->vma
4050 + resolved_plt->output_offset
4052 unresolved_reloc = FALSE;
4055 relocation -= htab->elf.sgotplt->output_section->vma
4056 + htab->elf.sgotplt->output_offset;
4059 case R_X86_64_PLT32:
4060 case R_X86_64_PLT32_BND:
4061 /* Relocation is to the entry for this symbol in the
4062 procedure linkage table. */
4064 /* Resolve a PLT32 reloc against a local symbol directly,
4065 without using the procedure linkage table. */
4069 if ((h->plt.offset == (bfd_vma) -1
4070 && eh->plt_got.offset == (bfd_vma) -1)
4071 || htab->elf.splt == NULL)
4073 /* We didn't make a PLT entry for this symbol. This
4074 happens when statically linking PIC code, or when
4075 using -Bsymbolic. */
4079 if (h->plt.offset != (bfd_vma) -1)
4081 if (htab->plt_bnd != NULL)
4083 resolved_plt = htab->plt_bnd;
4084 plt_offset = eh->plt_bnd.offset;
4088 resolved_plt = htab->elf.splt;
4089 plt_offset = h->plt.offset;
4094 /* Use the GOT PLT. */
4095 resolved_plt = htab->plt_got;
4096 plt_offset = eh->plt_got.offset;
4099 relocation = (resolved_plt->output_section->vma
4100 + resolved_plt->output_offset
4102 unresolved_reloc = FALSE;
4105 case R_X86_64_SIZE32:
4106 case R_X86_64_SIZE64:
4107 /* Set to symbol size. */
4108 relocation = st_size;
4114 case R_X86_64_PC32_BND:
4115 /* Don't complain about -fPIC if the symbol is undefined when
4116 building executable. */
4118 && (input_section->flags & SEC_ALLOC) != 0
4119 && (input_section->flags & SEC_READONLY) != 0
4121 && !(info->executable
4122 && h->root.type == bfd_link_hash_undefined))
4124 bfd_boolean fail = FALSE;
4126 = ((r_type == R_X86_64_PC32
4127 || r_type == R_X86_64_PC32_BND)
4128 && is_32bit_relative_branch (contents, rel->r_offset));
4130 if (SYMBOL_REFERENCES_LOCAL (info, h))
4132 /* Symbol is referenced locally. Make sure it is
4133 defined locally or for a branch. */
4134 fail = !h->def_regular && !branch;
4136 else if (!(info->executable
4137 && (h->needs_copy || eh->needs_copy)))
4139 /* Symbol doesn't need copy reloc and isn't referenced
4140 locally. We only allow branch to symbol with
4141 non-default visibility. */
4143 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4150 const char *pic = "";
4152 switch (ELF_ST_VISIBILITY (h->other))
4155 v = _("hidden symbol");
4158 v = _("internal symbol");
4161 v = _("protected symbol");
4165 pic = _("; recompile with -fPIC");
4170 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4172 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4174 (*_bfd_error_handler) (fmt, input_bfd,
4175 x86_64_elf_howto_table[r_type].name,
4176 v, h->root.root.string, pic);
4177 bfd_set_error (bfd_error_bad_value);
4188 /* FIXME: The ABI says the linker should make sure the value is
4189 the same when it's zeroextended to 64 bit. */
4192 if ((input_section->flags & SEC_ALLOC) == 0)
4195 /* Don't copy a pc-relative relocation into the output file
4196 if the symbol needs copy reloc or the symbol is undefined
4197 when building executable. */
4199 && !(info->executable
4203 || h->root.type == bfd_link_hash_undefined)
4204 && IS_X86_64_PCREL_TYPE (r_type))
4206 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4207 || h->root.type != bfd_link_hash_undefweak)
4208 && ((! IS_X86_64_PCREL_TYPE (r_type)
4209 && r_type != R_X86_64_SIZE32
4210 && r_type != R_X86_64_SIZE64)
4211 || ! SYMBOL_CALLS_LOCAL (info, h)))
4212 || (ELIMINATE_COPY_RELOCS
4219 || h->root.type == bfd_link_hash_undefweak
4220 || h->root.type == bfd_link_hash_undefined)))
4222 Elf_Internal_Rela outrel;
4223 bfd_boolean skip, relocate;
4226 /* When generating a shared object, these relocations
4227 are copied into the output file to be resolved at run
4233 _bfd_elf_section_offset (output_bfd, info, input_section,
4235 if (outrel.r_offset == (bfd_vma) -1)
4237 else if (outrel.r_offset == (bfd_vma) -2)
4238 skip = TRUE, relocate = TRUE;
4240 outrel.r_offset += (input_section->output_section->vma
4241 + input_section->output_offset);
4244 memset (&outrel, 0, sizeof outrel);
4246 /* h->dynindx may be -1 if this symbol was marked to
4250 && (IS_X86_64_PCREL_TYPE (r_type)
4252 || ! SYMBOLIC_BIND (info, h)
4253 || ! h->def_regular))
4255 outrel.r_info = htab->r_info (h->dynindx, r_type);
4256 outrel.r_addend = rel->r_addend;
4260 /* This symbol is local, or marked to become local. */
4261 if (r_type == htab->pointer_r_type)
4264 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4265 outrel.r_addend = relocation + rel->r_addend;
4267 else if (r_type == R_X86_64_64
4268 && !ABI_64_P (output_bfd))
4271 outrel.r_info = htab->r_info (0,
4272 R_X86_64_RELATIVE64);
4273 outrel.r_addend = relocation + rel->r_addend;
4274 /* Check addend overflow. */
4275 if ((outrel.r_addend & 0x80000000)
4276 != (rel->r_addend & 0x80000000))
4279 int addend = rel->r_addend;
4280 if (h && h->root.root.string)
4281 name = h->root.root.string;
4283 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4286 (*_bfd_error_handler)
4287 (_("%B: addend -0x%x in relocation %s against "
4288 "symbol `%s' at 0x%lx in section `%A' is "
4290 input_bfd, input_section, addend,
4291 x86_64_elf_howto_table[r_type].name,
4292 name, (unsigned long) rel->r_offset);
4294 (*_bfd_error_handler)
4295 (_("%B: addend 0x%x in relocation %s against "
4296 "symbol `%s' at 0x%lx in section `%A' is "
4298 input_bfd, input_section, addend,
4299 x86_64_elf_howto_table[r_type].name,
4300 name, (unsigned long) rel->r_offset);
4301 bfd_set_error (bfd_error_bad_value);
4309 if (bfd_is_abs_section (sec))
4311 else if (sec == NULL || sec->owner == NULL)
4313 bfd_set_error (bfd_error_bad_value);
4320 /* We are turning this relocation into one
4321 against a section symbol. It would be
4322 proper to subtract the symbol's value,
4323 osec->vma, from the emitted reloc addend,
4324 but ld.so expects buggy relocs. */
4325 osec = sec->output_section;
4326 sindx = elf_section_data (osec)->dynindx;
4329 asection *oi = htab->elf.text_index_section;
4330 sindx = elf_section_data (oi)->dynindx;
4332 BFD_ASSERT (sindx != 0);
4335 outrel.r_info = htab->r_info (sindx, r_type);
4336 outrel.r_addend = relocation + rel->r_addend;
4340 sreloc = elf_section_data (input_section)->sreloc;
4342 if (sreloc == NULL || sreloc->contents == NULL)
4344 r = bfd_reloc_notsupported;
4345 goto check_relocation_error;
4348 elf_append_rela (output_bfd, sreloc, &outrel);
4350 /* If this reloc is against an external symbol, we do
4351 not want to fiddle with the addend. Otherwise, we
4352 need to include the symbol value so that it becomes
4353 an addend for the dynamic reloc. */
4360 case R_X86_64_TLSGD:
4361 case R_X86_64_GOTPC32_TLSDESC:
4362 case R_X86_64_TLSDESC_CALL:
4363 case R_X86_64_GOTTPOFF:
4364 tls_type = GOT_UNKNOWN;
4365 if (h == NULL && local_got_offsets)
4366 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4368 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4370 if (! elf_x86_64_tls_transition (info, input_bfd,
4371 input_section, contents,
4372 symtab_hdr, sym_hashes,
4373 &r_type, tls_type, rel,
4374 relend, h, r_symndx))
4377 if (r_type == R_X86_64_TPOFF32)
4379 bfd_vma roff = rel->r_offset;
4381 BFD_ASSERT (! unresolved_reloc);
4383 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4385 /* GD->LE transition. For 64bit, change
4386 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4387 .word 0x6666; rex64; call __tls_get_addr
4390 leaq foo@tpoff(%rax), %rax
4392 leaq foo@tlsgd(%rip), %rdi
4393 .word 0x6666; rex64; call __tls_get_addr
4396 leaq foo@tpoff(%rax), %rax
4397 For largepic, change:
4398 leaq foo@tlsgd(%rip), %rdi
4399 movabsq $__tls_get_addr@pltoff, %rax
4404 leaq foo@tpoff(%rax), %rax
4405 nopw 0x0(%rax,%rax,1) */
4407 if (ABI_64_P (output_bfd)
4408 && contents[roff + 5] == (bfd_byte) '\xb8')
4410 memcpy (contents + roff - 3,
4411 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4412 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4415 else if (ABI_64_P (output_bfd))
4416 memcpy (contents + roff - 4,
4417 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4420 memcpy (contents + roff - 3,
4421 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4423 bfd_put_32 (output_bfd,
4424 elf_x86_64_tpoff (info, relocation),
4425 contents + roff + 8 + largepic);
4426 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4430 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4432 /* GDesc -> LE transition.
4433 It's originally something like:
4434 leaq x@tlsdesc(%rip), %rax
4437 movl $x@tpoff, %rax. */
4439 unsigned int val, type;
4441 type = bfd_get_8 (input_bfd, contents + roff - 3);
4442 val = bfd_get_8 (input_bfd, contents + roff - 1);
4443 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4444 contents + roff - 3);
4445 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4446 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4447 contents + roff - 1);
4448 bfd_put_32 (output_bfd,
4449 elf_x86_64_tpoff (info, relocation),
4453 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4455 /* GDesc -> LE transition.
4460 bfd_put_8 (output_bfd, 0x66, contents + roff);
4461 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4464 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4466 /* IE->LE transition:
4467 For 64bit, originally it can be one of:
4468 movq foo@gottpoff(%rip), %reg
4469 addq foo@gottpoff(%rip), %reg
4472 leaq foo(%reg), %reg
4474 For 32bit, originally it can be one of:
4475 movq foo@gottpoff(%rip), %reg
4476 addl foo@gottpoff(%rip), %reg
4479 leal foo(%reg), %reg
4482 unsigned int val, type, reg;
4485 val = bfd_get_8 (input_bfd, contents + roff - 3);
4488 type = bfd_get_8 (input_bfd, contents + roff - 2);
4489 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4495 bfd_put_8 (output_bfd, 0x49,
4496 contents + roff - 3);
4497 else if (!ABI_64_P (output_bfd) && val == 0x44)
4498 bfd_put_8 (output_bfd, 0x41,
4499 contents + roff - 3);
4500 bfd_put_8 (output_bfd, 0xc7,
4501 contents + roff - 2);
4502 bfd_put_8 (output_bfd, 0xc0 | reg,
4503 contents + roff - 1);
4507 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4510 bfd_put_8 (output_bfd, 0x49,
4511 contents + roff - 3);
4512 else if (!ABI_64_P (output_bfd) && val == 0x44)
4513 bfd_put_8 (output_bfd, 0x41,
4514 contents + roff - 3);
4515 bfd_put_8 (output_bfd, 0x81,
4516 contents + roff - 2);
4517 bfd_put_8 (output_bfd, 0xc0 | reg,
4518 contents + roff - 1);
4522 /* addq/addl -> leaq/leal */
4524 bfd_put_8 (output_bfd, 0x4d,
4525 contents + roff - 3);
4526 else if (!ABI_64_P (output_bfd) && val == 0x44)
4527 bfd_put_8 (output_bfd, 0x45,
4528 contents + roff - 3);
4529 bfd_put_8 (output_bfd, 0x8d,
4530 contents + roff - 2);
4531 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4532 contents + roff - 1);
4534 bfd_put_32 (output_bfd,
4535 elf_x86_64_tpoff (info, relocation),
4543 if (htab->elf.sgot == NULL)
4548 off = h->got.offset;
4549 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4553 if (local_got_offsets == NULL)
4556 off = local_got_offsets[r_symndx];
4557 offplt = local_tlsdesc_gotents[r_symndx];
4564 Elf_Internal_Rela outrel;
4568 if (htab->elf.srelgot == NULL)
4571 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4573 if (GOT_TLS_GDESC_P (tls_type))
4575 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4576 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4577 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4578 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4579 + htab->elf.sgotplt->output_offset
4581 + htab->sgotplt_jump_table_size);
4582 sreloc = htab->elf.srelplt;
4584 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4586 outrel.r_addend = 0;
4587 elf_append_rela (output_bfd, sreloc, &outrel);
4590 sreloc = htab->elf.srelgot;
4592 outrel.r_offset = (htab->elf.sgot->output_section->vma
4593 + htab->elf.sgot->output_offset + off);
4595 if (GOT_TLS_GD_P (tls_type))
4596 dr_type = R_X86_64_DTPMOD64;
4597 else if (GOT_TLS_GDESC_P (tls_type))
4600 dr_type = R_X86_64_TPOFF64;
4602 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4603 outrel.r_addend = 0;
4604 if ((dr_type == R_X86_64_TPOFF64
4605 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4606 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4607 outrel.r_info = htab->r_info (indx, dr_type);
4609 elf_append_rela (output_bfd, sreloc, &outrel);
4611 if (GOT_TLS_GD_P (tls_type))
4615 BFD_ASSERT (! unresolved_reloc);
4616 bfd_put_64 (output_bfd,
4617 relocation - elf_x86_64_dtpoff_base (info),
4618 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4622 bfd_put_64 (output_bfd, 0,
4623 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4624 outrel.r_info = htab->r_info (indx,
4626 outrel.r_offset += GOT_ENTRY_SIZE;
4627 elf_append_rela (output_bfd, sreloc,
4636 local_got_offsets[r_symndx] |= 1;
4639 if (off >= (bfd_vma) -2
4640 && ! GOT_TLS_GDESC_P (tls_type))
4642 if (r_type == ELF32_R_TYPE (rel->r_info))
4644 if (r_type == R_X86_64_GOTPC32_TLSDESC
4645 || r_type == R_X86_64_TLSDESC_CALL)
4646 relocation = htab->elf.sgotplt->output_section->vma
4647 + htab->elf.sgotplt->output_offset
4648 + offplt + htab->sgotplt_jump_table_size;
4650 relocation = htab->elf.sgot->output_section->vma
4651 + htab->elf.sgot->output_offset + off;
4652 unresolved_reloc = FALSE;
4656 bfd_vma roff = rel->r_offset;
4658 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4660 /* GD->IE transition. For 64bit, change
4661 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4662 .word 0x6666; rex64; call __tls_get_addr@plt
4665 addq foo@gottpoff(%rip), %rax
4667 leaq foo@tlsgd(%rip), %rdi
4668 .word 0x6666; rex64; call __tls_get_addr@plt
4671 addq foo@gottpoff(%rip), %rax
4672 For largepic, change:
4673 leaq foo@tlsgd(%rip), %rdi
4674 movabsq $__tls_get_addr@pltoff, %rax
4679 addq foo@gottpoff(%rax), %rax
4680 nopw 0x0(%rax,%rax,1) */
4682 if (ABI_64_P (output_bfd)
4683 && contents[roff + 5] == (bfd_byte) '\xb8')
4685 memcpy (contents + roff - 3,
4686 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4687 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4690 else if (ABI_64_P (output_bfd))
4691 memcpy (contents + roff - 4,
4692 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4695 memcpy (contents + roff - 3,
4696 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4699 relocation = (htab->elf.sgot->output_section->vma
4700 + htab->elf.sgot->output_offset + off
4703 - input_section->output_section->vma
4704 - input_section->output_offset
4706 bfd_put_32 (output_bfd, relocation,
4707 contents + roff + 8 + largepic);
4708 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4712 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4714 /* GDesc -> IE transition.
4715 It's originally something like:
4716 leaq x@tlsdesc(%rip), %rax
4719 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4721 /* Now modify the instruction as appropriate. To
4722 turn a leaq into a movq in the form we use it, it
4723 suffices to change the second byte from 0x8d to
4725 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4727 bfd_put_32 (output_bfd,
4728 htab->elf.sgot->output_section->vma
4729 + htab->elf.sgot->output_offset + off
4731 - input_section->output_section->vma
4732 - input_section->output_offset
4737 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4739 /* GDesc -> IE transition.
4746 bfd_put_8 (output_bfd, 0x66, contents + roff);
4747 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4755 case R_X86_64_TLSLD:
4756 if (! elf_x86_64_tls_transition (info, input_bfd,
4757 input_section, contents,
4758 symtab_hdr, sym_hashes,
4759 &r_type, GOT_UNKNOWN,
4760 rel, relend, h, r_symndx))
4763 if (r_type != R_X86_64_TLSLD)
4765 /* LD->LE transition:
4766 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4767 For 64bit, we change it into:
4768 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4769 For 32bit, we change it into:
4770 nopl 0x0(%rax); movl %fs:0, %eax.
4771 For largepic, change:
4772 leaq foo@tlsgd(%rip), %rdi
4773 movabsq $__tls_get_addr@pltoff, %rax
4777 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4780 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4781 if (ABI_64_P (output_bfd)
4782 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
4783 memcpy (contents + rel->r_offset - 3,
4784 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4785 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4786 else if (ABI_64_P (output_bfd))
4787 memcpy (contents + rel->r_offset - 3,
4788 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4790 memcpy (contents + rel->r_offset - 3,
4791 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4792 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4797 if (htab->elf.sgot == NULL)
4800 off = htab->tls_ld_got.offset;
4805 Elf_Internal_Rela outrel;
4807 if (htab->elf.srelgot == NULL)
4810 outrel.r_offset = (htab->elf.sgot->output_section->vma
4811 + htab->elf.sgot->output_offset + off);
4813 bfd_put_64 (output_bfd, 0,
4814 htab->elf.sgot->contents + off);
4815 bfd_put_64 (output_bfd, 0,
4816 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4817 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4818 outrel.r_addend = 0;
4819 elf_append_rela (output_bfd, htab->elf.srelgot,
4821 htab->tls_ld_got.offset |= 1;
4823 relocation = htab->elf.sgot->output_section->vma
4824 + htab->elf.sgot->output_offset + off;
4825 unresolved_reloc = FALSE;
4828 case R_X86_64_DTPOFF32:
4829 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4830 relocation -= elf_x86_64_dtpoff_base (info);
4832 relocation = elf_x86_64_tpoff (info, relocation);
4835 case R_X86_64_TPOFF32:
4836 case R_X86_64_TPOFF64:
4837 BFD_ASSERT (info->executable);
4838 relocation = elf_x86_64_tpoff (info, relocation);
4841 case R_X86_64_DTPOFF64:
4842 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4843 relocation -= elf_x86_64_dtpoff_base (info);
4850 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4851 because such sections are not SEC_ALLOC and thus ld.so will
4852 not process them. */
4853 if (unresolved_reloc
4854 && !((input_section->flags & SEC_DEBUGGING) != 0
4856 && _bfd_elf_section_offset (output_bfd, info, input_section,
4857 rel->r_offset) != (bfd_vma) -1)
4859 (*_bfd_error_handler)
4860 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4863 (long) rel->r_offset,
4865 h->root.root.string);
4870 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4871 contents, rel->r_offset,
4872 relocation, rel->r_addend);
4874 check_relocation_error:
4875 if (r != bfd_reloc_ok)
4880 name = h->root.root.string;
4883 name = bfd_elf_string_from_elf_section (input_bfd,
4884 symtab_hdr->sh_link,
4889 name = bfd_section_name (input_bfd, sec);
4892 if (r == bfd_reloc_overflow)
4894 if (! ((*info->callbacks->reloc_overflow)
4895 (info, (h ? &h->root : NULL), name, howto->name,
4896 (bfd_vma) 0, input_bfd, input_section,
4902 (*_bfd_error_handler)
4903 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4904 input_bfd, input_section,
4905 (long) rel->r_offset, name, (int) r);
4914 /* Finish up dynamic symbol handling. We set the contents of various
4915 dynamic sections here. */
4918 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4919 struct bfd_link_info *info,
4920 struct elf_link_hash_entry *h,
4921 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4923 struct elf_x86_64_link_hash_table *htab;
4924 const struct elf_x86_64_backend_data *abed;
4925 bfd_boolean use_plt_bnd;
4926 struct elf_x86_64_link_hash_entry *eh;
4928 htab = elf_x86_64_hash_table (info);
4932 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
4933 section only if there is .plt section. */
4934 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
4936 ? &elf_x86_64_bnd_arch_bed
4937 : get_elf_x86_64_backend_data (output_bfd));
4939 eh = (struct elf_x86_64_link_hash_entry *) h;
4941 if (h->plt.offset != (bfd_vma) -1)
4944 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
4945 bfd_vma plt_plt_insn_end, plt_got_insn_size;
4946 Elf_Internal_Rela rela;
4948 asection *plt, *gotplt, *relplt, *resolved_plt;
4949 const struct elf_backend_data *bed;
4950 bfd_vma plt_got_pcrel_offset;
4952 /* When building a static executable, use .iplt, .igot.plt and
4953 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4954 if (htab->elf.splt != NULL)
4956 plt = htab->elf.splt;
4957 gotplt = htab->elf.sgotplt;
4958 relplt = htab->elf.srelplt;
4962 plt = htab->elf.iplt;
4963 gotplt = htab->elf.igotplt;
4964 relplt = htab->elf.irelplt;
4967 /* This symbol has an entry in the procedure linkage table. Set
4969 if ((h->dynindx == -1
4970 && !((h->forced_local || info->executable)
4972 && h->type == STT_GNU_IFUNC))
4978 /* Get the index in the procedure linkage table which
4979 corresponds to this symbol. This is the index of this symbol
4980 in all the symbols for which we are making plt entries. The
4981 first entry in the procedure linkage table is reserved.
4983 Get the offset into the .got table of the entry that
4984 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4985 bytes. The first three are reserved for the dynamic linker.
4987 For static executables, we don't reserve anything. */
4989 if (plt == htab->elf.splt)
4991 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4992 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4996 got_offset = h->plt.offset / abed->plt_entry_size;
4997 got_offset = got_offset * GOT_ENTRY_SIZE;
5000 plt_plt_insn_end = abed->plt_plt_insn_end;
5001 plt_plt_offset = abed->plt_plt_offset;
5002 plt_got_insn_size = abed->plt_got_insn_size;
5003 plt_got_offset = abed->plt_got_offset;
5006 /* Use the second PLT with BND relocations. */
5007 const bfd_byte *plt_entry, *plt2_entry;
5009 if (eh->has_bnd_reloc)
5011 plt_entry = elf_x86_64_bnd_plt_entry;
5012 plt2_entry = elf_x86_64_bnd_plt2_entry;
5016 plt_entry = elf_x86_64_legacy_plt_entry;
5017 plt2_entry = elf_x86_64_legacy_plt2_entry;
5019 /* Subtract 1 since there is no BND prefix. */
5020 plt_plt_insn_end -= 1;
5021 plt_plt_offset -= 1;
5022 plt_got_insn_size -= 1;
5023 plt_got_offset -= 1;
5026 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
5027 == sizeof (elf_x86_64_legacy_plt_entry));
5029 /* Fill in the entry in the procedure linkage table. */
5030 memcpy (plt->contents + h->plt.offset,
5031 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
5032 /* Fill in the entry in the second PLT. */
5033 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
5034 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5036 resolved_plt = htab->plt_bnd;
5037 plt_offset = eh->plt_bnd.offset;
5041 /* Fill in the entry in the procedure linkage table. */
5042 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
5043 abed->plt_entry_size);
5046 plt_offset = h->plt.offset;
5049 /* Insert the relocation positions of the plt section. */
5051 /* Put offset the PC-relative instruction referring to the GOT entry,
5052 subtracting the size of that instruction. */
5053 plt_got_pcrel_offset = (gotplt->output_section->vma
5054 + gotplt->output_offset
5056 - resolved_plt->output_section->vma
5057 - resolved_plt->output_offset
5059 - plt_got_insn_size);
5061 /* Check PC-relative offset overflow in PLT entry. */
5062 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5063 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5064 output_bfd, h->root.root.string);
5066 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5067 resolved_plt->contents + plt_offset + plt_got_offset);
5069 /* Fill in the entry in the global offset table, initially this
5070 points to the second part of the PLT entry. */
5071 bfd_put_64 (output_bfd, (plt->output_section->vma
5072 + plt->output_offset
5073 + h->plt.offset + abed->plt_lazy_offset),
5074 gotplt->contents + got_offset);
5076 /* Fill in the entry in the .rela.plt section. */
5077 rela.r_offset = (gotplt->output_section->vma
5078 + gotplt->output_offset
5080 if (h->dynindx == -1
5081 || ((info->executable
5082 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5084 && h->type == STT_GNU_IFUNC))
5086 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5087 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5088 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5089 rela.r_addend = (h->root.u.def.value
5090 + h->root.u.def.section->output_section->vma
5091 + h->root.u.def.section->output_offset);
5092 /* R_X86_64_IRELATIVE comes last. */
5093 plt_index = htab->next_irelative_index--;
5097 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5099 plt_index = htab->next_jump_slot_index++;
5102 /* Don't fill PLT entry for static executables. */
5103 if (plt == htab->elf.splt)
5105 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5107 /* Put relocation index. */
5108 bfd_put_32 (output_bfd, plt_index,
5109 plt->contents + h->plt.offset + abed->plt_reloc_offset);
5111 /* Put offset for jmp .PLT0 and check for overflow. We don't
5112 check relocation index for overflow since branch displacement
5113 will overflow first. */
5114 if (plt0_offset > 0x80000000)
5115 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5116 output_bfd, h->root.root.string);
5117 bfd_put_32 (output_bfd, - plt0_offset,
5118 plt->contents + h->plt.offset + plt_plt_offset);
5121 bed = get_elf_backend_data (output_bfd);
5122 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5123 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5125 else if (eh->plt_got.offset != (bfd_vma) -1)
5127 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
5128 asection *plt, *got;
5129 bfd_boolean got_after_plt;
5130 int32_t got_pcrel_offset;
5131 const bfd_byte *got_plt_entry;
5133 /* Set the entry in the GOT procedure linkage table. */
5134 plt = htab->plt_got;
5135 got = htab->elf.sgot;
5136 got_offset = h->got.offset;
5138 if (got_offset == (bfd_vma) -1
5139 || h->type == STT_GNU_IFUNC
5144 /* Use the second PLT entry template for the GOT PLT since they
5145 are the identical. */
5146 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
5147 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
5148 if (eh->has_bnd_reloc)
5149 got_plt_entry = elf_x86_64_bnd_plt2_entry;
5152 got_plt_entry = elf_x86_64_legacy_plt2_entry;
5154 /* Subtract 1 since there is no BND prefix. */
5155 plt_got_insn_size -= 1;
5156 plt_got_offset -= 1;
5159 /* Fill in the entry in the GOT procedure linkage table. */
5160 plt_offset = eh->plt_got.offset;
5161 memcpy (plt->contents + plt_offset,
5162 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5164 /* Put offset the PC-relative instruction referring to the GOT
5165 entry, subtracting the size of that instruction. */
5166 got_pcrel_offset = (got->output_section->vma
5167 + got->output_offset
5169 - plt->output_section->vma
5170 - plt->output_offset
5172 - plt_got_insn_size);
5174 /* Check PC-relative offset overflow in GOT PLT entry. */
5175 got_after_plt = got->output_section->vma > plt->output_section->vma;
5176 if ((got_after_plt && got_pcrel_offset < 0)
5177 || (!got_after_plt && got_pcrel_offset > 0))
5178 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5179 output_bfd, h->root.root.string);
5181 bfd_put_32 (output_bfd, got_pcrel_offset,
5182 plt->contents + plt_offset + plt_got_offset);
5186 && (h->plt.offset != (bfd_vma) -1
5187 || eh->plt_got.offset != (bfd_vma) -1))
5189 /* Mark the symbol as undefined, rather than as defined in
5190 the .plt section. Leave the value if there were any
5191 relocations where pointer equality matters (this is a clue
5192 for the dynamic linker, to make function pointer
5193 comparisons work between an application and shared
5194 library), otherwise set it to zero. If a function is only
5195 called from a binary, there is no need to slow down
5196 shared libraries because of that. */
5197 sym->st_shndx = SHN_UNDEF;
5198 if (!h->pointer_equality_needed)
5202 if (h->got.offset != (bfd_vma) -1
5203 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
5204 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
5206 Elf_Internal_Rela rela;
5208 /* This symbol has an entry in the global offset table. Set it
5210 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5213 rela.r_offset = (htab->elf.sgot->output_section->vma
5214 + htab->elf.sgot->output_offset
5215 + (h->got.offset &~ (bfd_vma) 1));
5217 /* If this is a static link, or it is a -Bsymbolic link and the
5218 symbol is defined locally or was forced to be local because
5219 of a version file, we just want to emit a RELATIVE reloc.
5220 The entry in the global offset table will already have been
5221 initialized in the relocate_section function. */
5223 && h->type == STT_GNU_IFUNC)
5227 /* Generate R_X86_64_GLOB_DAT. */
5234 if (!h->pointer_equality_needed)
5237 /* For non-shared object, we can't use .got.plt, which
5238 contains the real function addres if we need pointer
5239 equality. We load the GOT entry with the PLT entry. */
5240 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5241 bfd_put_64 (output_bfd, (plt->output_section->vma
5242 + plt->output_offset
5244 htab->elf.sgot->contents + h->got.offset);
5248 else if (info->shared
5249 && SYMBOL_REFERENCES_LOCAL (info, h))
5251 if (!h->def_regular)
5253 BFD_ASSERT((h->got.offset & 1) != 0);
5254 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5255 rela.r_addend = (h->root.u.def.value
5256 + h->root.u.def.section->output_section->vma
5257 + h->root.u.def.section->output_offset);
5261 BFD_ASSERT((h->got.offset & 1) == 0);
5263 bfd_put_64 (output_bfd, (bfd_vma) 0,
5264 htab->elf.sgot->contents + h->got.offset);
5265 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5269 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5274 Elf_Internal_Rela rela;
5276 /* This symbol needs a copy reloc. Set it up. */
5278 if (h->dynindx == -1
5279 || (h->root.type != bfd_link_hash_defined
5280 && h->root.type != bfd_link_hash_defweak)
5281 || htab->srelbss == NULL)
5284 rela.r_offset = (h->root.u.def.value
5285 + h->root.u.def.section->output_section->vma
5286 + h->root.u.def.section->output_offset);
5287 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5289 elf_append_rela (output_bfd, htab->srelbss, &rela);
5295 /* Finish up local dynamic symbol handling. We set the contents of
5296 various dynamic sections here. */
5299 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5301 struct elf_link_hash_entry *h
5302 = (struct elf_link_hash_entry *) *slot;
5303 struct bfd_link_info *info
5304 = (struct bfd_link_info *) inf;
5306 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5310 /* Used to decide how to sort relocs in an optimal manner for the
5311 dynamic linker, before writing them out. */
5313 static enum elf_reloc_type_class
5314 elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
5315 const asection *rel_sec ATTRIBUTE_UNUSED,
5316 const Elf_Internal_Rela *rela)
5318 switch ((int) ELF32_R_TYPE (rela->r_info))
5320 case R_X86_64_RELATIVE:
5321 case R_X86_64_RELATIVE64:
5322 return reloc_class_relative;
5323 case R_X86_64_JUMP_SLOT:
5324 return reloc_class_plt;
5326 return reloc_class_copy;
5328 return reloc_class_normal;
5332 /* Finish up the dynamic sections. */
5335 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5336 struct bfd_link_info *info)
5338 struct elf_x86_64_link_hash_table *htab;
5341 const struct elf_x86_64_backend_data *abed;
5343 htab = elf_x86_64_hash_table (info);
5347 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5348 section only if there is .plt section. */
5349 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5350 ? &elf_x86_64_bnd_arch_bed
5351 : get_elf_x86_64_backend_data (output_bfd));
5353 dynobj = htab->elf.dynobj;
5354 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5356 if (htab->elf.dynamic_sections_created)
5358 bfd_byte *dyncon, *dynconend;
5359 const struct elf_backend_data *bed;
5360 bfd_size_type sizeof_dyn;
5362 if (sdyn == NULL || htab->elf.sgot == NULL)
5365 bed = get_elf_backend_data (dynobj);
5366 sizeof_dyn = bed->s->sizeof_dyn;
5367 dyncon = sdyn->contents;
5368 dynconend = sdyn->contents + sdyn->size;
5369 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5371 Elf_Internal_Dyn dyn;
5374 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5382 s = htab->elf.sgotplt;
5383 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5387 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5391 s = htab->elf.srelplt->output_section;
5392 dyn.d_un.d_val = s->size;
5396 /* The procedure linkage table relocs (DT_JMPREL) should
5397 not be included in the overall relocs (DT_RELA).
5398 Therefore, we override the DT_RELASZ entry here to
5399 make it not include the JMPREL relocs. Since the
5400 linker script arranges for .rela.plt to follow all
5401 other relocation sections, we don't have to worry
5402 about changing the DT_RELA entry. */
5403 if (htab->elf.srelplt != NULL)
5405 s = htab->elf.srelplt->output_section;
5406 dyn.d_un.d_val -= s->size;
5410 case DT_TLSDESC_PLT:
5412 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5413 + htab->tlsdesc_plt;
5416 case DT_TLSDESC_GOT:
5418 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5419 + htab->tlsdesc_got;
5423 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5426 /* Fill in the special first entry in the procedure linkage table. */
5427 if (htab->elf.splt && htab->elf.splt->size > 0)
5429 /* Fill in the first entry in the procedure linkage table. */
5430 memcpy (htab->elf.splt->contents,
5431 abed->plt0_entry, abed->plt_entry_size);
5432 /* Add offset for pushq GOT+8(%rip), since the instruction
5433 uses 6 bytes subtract this value. */
5434 bfd_put_32 (output_bfd,
5435 (htab->elf.sgotplt->output_section->vma
5436 + htab->elf.sgotplt->output_offset
5438 - htab->elf.splt->output_section->vma
5439 - htab->elf.splt->output_offset
5441 htab->elf.splt->contents + abed->plt0_got1_offset);
5442 /* Add offset for the PC-relative instruction accessing GOT+16,
5443 subtracting the offset to the end of that instruction. */
5444 bfd_put_32 (output_bfd,
5445 (htab->elf.sgotplt->output_section->vma
5446 + htab->elf.sgotplt->output_offset
5448 - htab->elf.splt->output_section->vma
5449 - htab->elf.splt->output_offset
5450 - abed->plt0_got2_insn_end),
5451 htab->elf.splt->contents + abed->plt0_got2_offset);
5453 elf_section_data (htab->elf.splt->output_section)
5454 ->this_hdr.sh_entsize = abed->plt_entry_size;
5456 if (htab->tlsdesc_plt)
5458 bfd_put_64 (output_bfd, (bfd_vma) 0,
5459 htab->elf.sgot->contents + htab->tlsdesc_got);
5461 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5462 abed->plt0_entry, abed->plt_entry_size);
5464 /* Add offset for pushq GOT+8(%rip), since the
5465 instruction uses 6 bytes subtract this value. */
5466 bfd_put_32 (output_bfd,
5467 (htab->elf.sgotplt->output_section->vma
5468 + htab->elf.sgotplt->output_offset
5470 - htab->elf.splt->output_section->vma
5471 - htab->elf.splt->output_offset
5474 htab->elf.splt->contents
5475 + htab->tlsdesc_plt + abed->plt0_got1_offset);
5476 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5477 where TGD stands for htab->tlsdesc_got, subtracting the offset
5478 to the end of that instruction. */
5479 bfd_put_32 (output_bfd,
5480 (htab->elf.sgot->output_section->vma
5481 + htab->elf.sgot->output_offset
5483 - htab->elf.splt->output_section->vma
5484 - htab->elf.splt->output_offset
5486 - abed->plt0_got2_insn_end),
5487 htab->elf.splt->contents
5488 + htab->tlsdesc_plt + abed->plt0_got2_offset);
5493 if (htab->plt_bnd != NULL)
5494 elf_section_data (htab->plt_bnd->output_section)
5495 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
5497 if (htab->elf.sgotplt)
5499 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5501 (*_bfd_error_handler)
5502 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5506 /* Fill in the first three entries in the global offset table. */
5507 if (htab->elf.sgotplt->size > 0)
5509 /* Set the first entry in the global offset table to the address of
5510 the dynamic section. */
5512 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5514 bfd_put_64 (output_bfd,
5515 sdyn->output_section->vma + sdyn->output_offset,
5516 htab->elf.sgotplt->contents);
5517 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5518 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5519 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5522 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
5526 /* Adjust .eh_frame for .plt section. */
5527 if (htab->plt_eh_frame != NULL
5528 && htab->plt_eh_frame->contents != NULL)
5530 if (htab->elf.splt != NULL
5531 && htab->elf.splt->size != 0
5532 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5533 && htab->elf.splt->output_section != NULL
5534 && htab->plt_eh_frame->output_section != NULL)
5536 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5537 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5538 + htab->plt_eh_frame->output_offset
5539 + PLT_FDE_START_OFFSET;
5540 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5541 htab->plt_eh_frame->contents
5542 + PLT_FDE_START_OFFSET);
5544 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5546 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5548 htab->plt_eh_frame->contents))
5553 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5554 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5557 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5558 htab_traverse (htab->loc_hash_table,
5559 elf_x86_64_finish_local_dynamic_symbol,
5565 /* Return an array of PLT entry symbol values. */
5568 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5571 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5574 bfd_vma *plt_sym_val;
5576 bfd_byte *plt_contents;
5577 const struct elf_x86_64_backend_data *bed;
5578 Elf_Internal_Shdr *hdr;
5581 /* Get the .plt section contents. PLT passed down may point to the
5582 .plt.bnd section. Make sure that PLT always points to the .plt
5584 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
5589 plt = bfd_get_section_by_name (abfd, ".plt");
5592 bed = &elf_x86_64_bnd_arch_bed;
5595 bed = get_elf_x86_64_backend_data (abfd);
5597 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5598 if (plt_contents == NULL)
5600 if (!bfd_get_section_contents (abfd, (asection *) plt,
5601 plt_contents, 0, plt->size))
5604 free (plt_contents);
5608 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5609 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5612 hdr = &elf_section_data (relplt)->this_hdr;
5613 count = relplt->size / hdr->sh_entsize;
5615 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5616 if (plt_sym_val == NULL)
5619 for (i = 0; i < count; i++)
5620 plt_sym_val[i] = -1;
5622 plt_offset = bed->plt_entry_size;
5623 p = relplt->relocation;
5624 for (i = 0; i < count; i++, p++)
5628 /* Skip unknown relocation. */
5629 if (p->howto == NULL)
5632 if (p->howto->type != R_X86_64_JUMP_SLOT
5633 && p->howto->type != R_X86_64_IRELATIVE)
5636 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5637 + bed->plt_reloc_offset));
5638 if (reloc_index >= count)
5642 /* This is the index in .plt section. */
5643 long plt_index = plt_offset / bed->plt_entry_size;
5644 /* Store VMA + the offset in .plt.bnd section. */
5645 plt_sym_val[reloc_index] =
5647 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
5650 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5651 plt_offset += bed->plt_entry_size;
5654 free (plt_contents);
5659 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5663 elf_x86_64_get_synthetic_symtab (bfd *abfd,
5670 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5671 as PLT if it exists. */
5672 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
5674 plt = bfd_get_section_by_name (abfd, ".plt");
5675 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5676 dynsymcount, dynsyms, ret,
5678 elf_x86_64_get_plt_sym_val);
5681 /* Handle an x86-64 specific section when reading an object file. This
5682 is called when elfcode.h finds a section with an unknown type. */
5685 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5686 const char *name, int shindex)
5688 if (hdr->sh_type != SHT_X86_64_UNWIND)
5691 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5697 /* Hook called by the linker routine which adds symbols from an object
5698 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5702 elf_x86_64_add_symbol_hook (bfd *abfd,
5703 struct bfd_link_info *info,
5704 Elf_Internal_Sym *sym,
5705 const char **namep ATTRIBUTE_UNUSED,
5706 flagword *flagsp ATTRIBUTE_UNUSED,
5712 switch (sym->st_shndx)
5714 case SHN_X86_64_LCOMMON:
5715 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
5718 lcomm = bfd_make_section_with_flags (abfd,
5722 | SEC_LINKER_CREATED));
5725 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
5728 *valp = sym->st_size;
5732 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5733 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5734 && (abfd->flags & DYNAMIC) == 0
5735 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5736 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5742 /* Given a BFD section, try to locate the corresponding ELF section
5746 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
5747 asection *sec, int *index_return)
5749 if (sec == &_bfd_elf_large_com_section)
5751 *index_return = SHN_X86_64_LCOMMON;
5757 /* Process a symbol. */
5760 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5763 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5765 switch (elfsym->internal_elf_sym.st_shndx)
5767 case SHN_X86_64_LCOMMON:
5768 asym->section = &_bfd_elf_large_com_section;
5769 asym->value = elfsym->internal_elf_sym.st_size;
5770 /* Common symbol doesn't set BSF_GLOBAL. */
5771 asym->flags &= ~BSF_GLOBAL;
5777 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5779 return (sym->st_shndx == SHN_COMMON
5780 || sym->st_shndx == SHN_X86_64_LCOMMON);
5784 elf_x86_64_common_section_index (asection *sec)
5786 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5789 return SHN_X86_64_LCOMMON;
5793 elf_x86_64_common_section (asection *sec)
5795 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5796 return bfd_com_section_ptr;
5798 return &_bfd_elf_large_com_section;
5802 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
5803 const Elf_Internal_Sym *sym,
5808 const asection *oldsec)
5810 /* A normal common symbol and a large common symbol result in a
5811 normal common symbol. We turn the large common symbol into a
5814 && h->root.type == bfd_link_hash_common
5816 && bfd_is_com_section (*psec)
5819 if (sym->st_shndx == SHN_COMMON
5820 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
5822 h->root.u.c.p->section
5823 = bfd_make_section_old_way (oldbfd, "COMMON");
5824 h->root.u.c.p->section->flags = SEC_ALLOC;
5826 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5827 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
5828 *psec = bfd_com_section_ptr;
5835 elf_x86_64_additional_program_headers (bfd *abfd,
5836 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5841 /* Check to see if we need a large readonly segment. */
5842 s = bfd_get_section_by_name (abfd, ".lrodata");
5843 if (s && (s->flags & SEC_LOAD))
5846 /* Check to see if we need a large data segment. Since .lbss sections
5847 is placed right after the .bss section, there should be no need for
5848 a large data segment just because of .lbss. */
5849 s = bfd_get_section_by_name (abfd, ".ldata");
5850 if (s && (s->flags & SEC_LOAD))
5856 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5859 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5861 if (h->plt.offset != (bfd_vma) -1
5863 && !h->pointer_equality_needed)
5866 return _bfd_elf_hash_symbol (h);
5869 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5872 elf_x86_64_relocs_compatible (const bfd_target *input,
5873 const bfd_target *output)
5875 return ((xvec_get_elf_backend_data (input)->s->elfclass
5876 == xvec_get_elf_backend_data (output)->s->elfclass)
5877 && _bfd_elf_relocs_compatible (input, output));
5880 static const struct bfd_elf_special_section
5881 elf_x86_64_special_sections[]=
5883 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5884 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5885 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5886 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5887 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5888 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5889 { NULL, 0, 0, 0, 0 }
5892 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5893 #define TARGET_LITTLE_NAME "elf64-x86-64"
5894 #define ELF_ARCH bfd_arch_i386
5895 #define ELF_TARGET_ID X86_64_ELF_DATA
5896 #define ELF_MACHINE_CODE EM_X86_64
5897 #define ELF_MAXPAGESIZE 0x200000
5898 #define ELF_MINPAGESIZE 0x1000
5899 #define ELF_COMMONPAGESIZE 0x1000
5901 #define elf_backend_can_gc_sections 1
5902 #define elf_backend_can_refcount 1
5903 #define elf_backend_want_got_plt 1
5904 #define elf_backend_plt_readonly 1
5905 #define elf_backend_want_plt_sym 0
5906 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5907 #define elf_backend_rela_normal 1
5908 #define elf_backend_plt_alignment 4
5909 #define elf_backend_extern_protected_data 1
5911 #define elf_info_to_howto elf_x86_64_info_to_howto
5913 #define bfd_elf64_bfd_link_hash_table_create \
5914 elf_x86_64_link_hash_table_create
5915 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5916 #define bfd_elf64_bfd_reloc_name_lookup \
5917 elf_x86_64_reloc_name_lookup
5919 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5920 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5921 #define elf_backend_check_relocs elf_x86_64_check_relocs
5922 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5923 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5924 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5925 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5926 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5927 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5928 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5929 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5931 #define elf_backend_write_core_note elf_x86_64_write_core_note
5933 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5934 #define elf_backend_relocate_section elf_x86_64_relocate_section
5935 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5936 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5937 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5938 #define elf_backend_object_p elf64_x86_64_elf_object_p
5939 #define bfd_elf64_mkobject elf_x86_64_mkobject
5940 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5942 #define elf_backend_section_from_shdr \
5943 elf_x86_64_section_from_shdr
5945 #define elf_backend_section_from_bfd_section \
5946 elf_x86_64_elf_section_from_bfd_section
5947 #define elf_backend_add_symbol_hook \
5948 elf_x86_64_add_symbol_hook
5949 #define elf_backend_symbol_processing \
5950 elf_x86_64_symbol_processing
5951 #define elf_backend_common_section_index \
5952 elf_x86_64_common_section_index
5953 #define elf_backend_common_section \
5954 elf_x86_64_common_section
5955 #define elf_backend_common_definition \
5956 elf_x86_64_common_definition
5957 #define elf_backend_merge_symbol \
5958 elf_x86_64_merge_symbol
5959 #define elf_backend_special_sections \
5960 elf_x86_64_special_sections
5961 #define elf_backend_additional_program_headers \
5962 elf_x86_64_additional_program_headers
5963 #define elf_backend_hash_symbol \
5964 elf_x86_64_hash_symbol
5966 #include "elf64-target.h"
5968 /* CloudABI support. */
5970 #undef TARGET_LITTLE_SYM
5971 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
5972 #undef TARGET_LITTLE_NAME
5973 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
5976 #define ELF_OSABI ELFOSABI_CLOUDABI
5979 #define elf64_bed elf64_x86_64_cloudabi_bed
5981 #include "elf64-target.h"
5983 /* FreeBSD support. */
5985 #undef TARGET_LITTLE_SYM
5986 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5987 #undef TARGET_LITTLE_NAME
5988 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5991 #define ELF_OSABI ELFOSABI_FREEBSD
5994 #define elf64_bed elf64_x86_64_fbsd_bed
5996 #include "elf64-target.h"
5998 /* Solaris 2 support. */
6000 #undef TARGET_LITTLE_SYM
6001 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6002 #undef TARGET_LITTLE_NAME
6003 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6005 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6006 objects won't be recognized. */
6010 #define elf64_bed elf64_x86_64_sol2_bed
6012 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6014 #undef elf_backend_static_tls_alignment
6015 #define elf_backend_static_tls_alignment 16
6017 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6019 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6021 #undef elf_backend_want_plt_sym
6022 #define elf_backend_want_plt_sym 1
6024 #include "elf64-target.h"
6026 /* Native Client support. */
6029 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
6031 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6032 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
6036 #undef TARGET_LITTLE_SYM
6037 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6038 #undef TARGET_LITTLE_NAME
6039 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6041 #define elf64_bed elf64_x86_64_nacl_bed
6043 #undef ELF_MAXPAGESIZE
6044 #undef ELF_MINPAGESIZE
6045 #undef ELF_COMMONPAGESIZE
6046 #define ELF_MAXPAGESIZE 0x10000
6047 #define ELF_MINPAGESIZE 0x10000
6048 #define ELF_COMMONPAGESIZE 0x10000
6050 /* Restore defaults. */
6052 #undef elf_backend_static_tls_alignment
6053 #undef elf_backend_want_plt_sym
6054 #define elf_backend_want_plt_sym 0
6056 /* NaCl uses substantially different PLT entries for the same effects. */
6058 #undef elf_backend_plt_alignment
6059 #define elf_backend_plt_alignment 5
6060 #define NACL_PLT_ENTRY_SIZE 64
6061 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6063 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6065 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6066 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6067 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6068 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6069 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6071 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6072 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6074 /* 32 bytes of nop to pad out to the standard size. */
6075 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6076 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6077 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6078 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6079 0x66, /* excess data32 prefix */
6083 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6085 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6086 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6087 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6088 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6090 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6091 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6092 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6094 /* Lazy GOT entries point here (32-byte aligned). */
6095 0x68, /* pushq immediate */
6096 0, 0, 0, 0, /* replaced with index into relocation table. */
6097 0xe9, /* jmp relative */
6098 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6100 /* 22 bytes of nop to pad out to the standard size. */
6101 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6102 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6103 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6106 /* .eh_frame covering the .plt section. */
6108 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6110 #if (PLT_CIE_LENGTH != 20 \
6111 || PLT_FDE_LENGTH != 36 \
6112 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6113 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6114 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6116 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6117 0, 0, 0, 0, /* CIE ID */
6118 1, /* CIE version */
6119 'z', 'R', 0, /* Augmentation string */
6120 1, /* Code alignment factor */
6121 0x78, /* Data alignment factor */
6122 16, /* Return address column */
6123 1, /* Augmentation size */
6124 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6125 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6126 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6127 DW_CFA_nop, DW_CFA_nop,
6129 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6130 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6131 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6132 0, 0, 0, 0, /* .plt size goes here */
6133 0, /* Augmentation size */
6134 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6135 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6136 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6137 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6138 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6139 13, /* Block length */
6140 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6141 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6142 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6143 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6144 DW_CFA_nop, DW_CFA_nop
6147 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6149 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6150 elf_x86_64_nacl_plt_entry, /* plt_entry */
6151 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6152 2, /* plt0_got1_offset */
6153 9, /* plt0_got2_offset */
6154 13, /* plt0_got2_insn_end */
6155 3, /* plt_got_offset */
6156 33, /* plt_reloc_offset */
6157 38, /* plt_plt_offset */
6158 7, /* plt_got_insn_size */
6159 42, /* plt_plt_insn_end */
6160 32, /* plt_lazy_offset */
6161 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6162 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6165 #undef elf_backend_arch_data
6166 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6168 #undef elf_backend_object_p
6169 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6170 #undef elf_backend_modify_segment_map
6171 #define elf_backend_modify_segment_map nacl_modify_segment_map
6172 #undef elf_backend_modify_program_headers
6173 #define elf_backend_modify_program_headers nacl_modify_program_headers
6174 #undef elf_backend_final_write_processing
6175 #define elf_backend_final_write_processing nacl_final_write_processing
6177 #include "elf64-target.h"
6179 /* Native Client x32 support. */
6182 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6184 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6185 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6189 #undef TARGET_LITTLE_SYM
6190 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6191 #undef TARGET_LITTLE_NAME
6192 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6194 #define elf32_bed elf32_x86_64_nacl_bed
6196 #define bfd_elf32_bfd_link_hash_table_create \
6197 elf_x86_64_link_hash_table_create
6198 #define bfd_elf32_bfd_reloc_type_lookup \
6199 elf_x86_64_reloc_type_lookup
6200 #define bfd_elf32_bfd_reloc_name_lookup \
6201 elf_x86_64_reloc_name_lookup
6202 #define bfd_elf32_mkobject \
6204 #define bfd_elf32_get_synthetic_symtab \
6205 elf_x86_64_get_synthetic_symtab
6207 #undef elf_backend_object_p
6208 #define elf_backend_object_p \
6209 elf32_x86_64_nacl_elf_object_p
6211 #undef elf_backend_bfd_from_remote_memory
6212 #define elf_backend_bfd_from_remote_memory \
6213 _bfd_elf32_bfd_from_remote_memory
6215 #undef elf_backend_size_info
6216 #define elf_backend_size_info \
6217 _bfd_elf32_size_info
6219 #include "elf32-target.h"
6221 /* Restore defaults. */
6222 #undef elf_backend_object_p
6223 #define elf_backend_object_p elf64_x86_64_elf_object_p
6224 #undef elf_backend_bfd_from_remote_memory
6225 #undef elf_backend_size_info
6226 #undef elf_backend_modify_segment_map
6227 #undef elf_backend_modify_program_headers
6228 #undef elf_backend_final_write_processing
6230 /* Intel L1OM support. */
6233 elf64_l1om_elf_object_p (bfd *abfd)
6235 /* Set the right machine number for an L1OM elf64 file. */
6236 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6240 #undef TARGET_LITTLE_SYM
6241 #define TARGET_LITTLE_SYM l1om_elf64_vec
6242 #undef TARGET_LITTLE_NAME
6243 #define TARGET_LITTLE_NAME "elf64-l1om"
6245 #define ELF_ARCH bfd_arch_l1om
6247 #undef ELF_MACHINE_CODE
6248 #define ELF_MACHINE_CODE EM_L1OM
6253 #define elf64_bed elf64_l1om_bed
6255 #undef elf_backend_object_p
6256 #define elf_backend_object_p elf64_l1om_elf_object_p
6258 /* Restore defaults. */
6259 #undef ELF_MAXPAGESIZE
6260 #undef ELF_MINPAGESIZE
6261 #undef ELF_COMMONPAGESIZE
6262 #define ELF_MAXPAGESIZE 0x200000
6263 #define ELF_MINPAGESIZE 0x1000
6264 #define ELF_COMMONPAGESIZE 0x1000
6265 #undef elf_backend_plt_alignment
6266 #define elf_backend_plt_alignment 4
6267 #undef elf_backend_arch_data
6268 #define elf_backend_arch_data &elf_x86_64_arch_bed
6270 #include "elf64-target.h"
6272 /* FreeBSD L1OM support. */
6274 #undef TARGET_LITTLE_SYM
6275 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6276 #undef TARGET_LITTLE_NAME
6277 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6280 #define ELF_OSABI ELFOSABI_FREEBSD
6283 #define elf64_bed elf64_l1om_fbsd_bed
6285 #include "elf64-target.h"
6287 /* Intel K1OM support. */
6290 elf64_k1om_elf_object_p (bfd *abfd)
6292 /* Set the right machine number for an K1OM elf64 file. */
6293 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6297 #undef TARGET_LITTLE_SYM
6298 #define TARGET_LITTLE_SYM k1om_elf64_vec
6299 #undef TARGET_LITTLE_NAME
6300 #define TARGET_LITTLE_NAME "elf64-k1om"
6302 #define ELF_ARCH bfd_arch_k1om
6304 #undef ELF_MACHINE_CODE
6305 #define ELF_MACHINE_CODE EM_K1OM
6310 #define elf64_bed elf64_k1om_bed
6312 #undef elf_backend_object_p
6313 #define elf_backend_object_p elf64_k1om_elf_object_p
6315 #undef elf_backend_static_tls_alignment
6317 #undef elf_backend_want_plt_sym
6318 #define elf_backend_want_plt_sym 0
6320 #include "elf64-target.h"
6322 /* FreeBSD K1OM support. */
6324 #undef TARGET_LITTLE_SYM
6325 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6326 #undef TARGET_LITTLE_NAME
6327 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6330 #define ELF_OSABI ELFOSABI_FREEBSD
6333 #define elf64_bed elf64_k1om_fbsd_bed
6335 #include "elf64-target.h"
6337 /* 32bit x86-64 support. */
6339 #undef TARGET_LITTLE_SYM
6340 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6341 #undef TARGET_LITTLE_NAME
6342 #define TARGET_LITTLE_NAME "elf32-x86-64"
6346 #define ELF_ARCH bfd_arch_i386
6348 #undef ELF_MACHINE_CODE
6349 #define ELF_MACHINE_CODE EM_X86_64
6353 #undef elf_backend_object_p
6354 #define elf_backend_object_p \
6355 elf32_x86_64_elf_object_p
6357 #undef elf_backend_bfd_from_remote_memory
6358 #define elf_backend_bfd_from_remote_memory \
6359 _bfd_elf32_bfd_from_remote_memory
6361 #undef elf_backend_size_info
6362 #define elf_backend_size_info \
6363 _bfd_elf32_size_info
6365 #include "elf32-target.h"