1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 Free Software Foundation, Inc.
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;
1727 if (h->type == STT_GNU_IFUNC)
1728 elf_tdata (info->output_bfd)->has_gnu_symbols
1729 |= elf_gnu_symbol_ifunc;
1732 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1733 symtab_hdr, sym_hashes,
1734 &r_type, GOT_UNKNOWN,
1735 rel, rel_end, h, r_symndx))
1740 case R_X86_64_TLSLD:
1741 htab->tls_ld_got.refcount += 1;
1744 case R_X86_64_TPOFF32:
1745 if (!info->executable && ABI_64_P (abfd))
1748 name = h->root.root.string;
1750 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1752 (*_bfd_error_handler)
1753 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1755 x86_64_elf_howto_table[r_type].name, name);
1756 bfd_set_error (bfd_error_bad_value);
1761 case R_X86_64_GOTTPOFF:
1762 if (!info->executable)
1763 info->flags |= DF_STATIC_TLS;
1766 case R_X86_64_GOT32:
1767 case R_X86_64_GOTPCREL:
1768 case R_X86_64_TLSGD:
1769 case R_X86_64_GOT64:
1770 case R_X86_64_GOTPCREL64:
1771 case R_X86_64_GOTPLT64:
1772 case R_X86_64_GOTPC32_TLSDESC:
1773 case R_X86_64_TLSDESC_CALL:
1774 /* This symbol requires a global offset table entry. */
1776 int tls_type, old_tls_type;
1780 default: tls_type = GOT_NORMAL; break;
1781 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1782 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1783 case R_X86_64_GOTPC32_TLSDESC:
1784 case R_X86_64_TLSDESC_CALL:
1785 tls_type = GOT_TLS_GDESC; break;
1790 h->got.refcount += 1;
1791 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1795 bfd_signed_vma *local_got_refcounts;
1797 /* This is a global offset table entry for a local symbol. */
1798 local_got_refcounts = elf_local_got_refcounts (abfd);
1799 if (local_got_refcounts == NULL)
1803 size = symtab_hdr->sh_info;
1804 size *= sizeof (bfd_signed_vma)
1805 + sizeof (bfd_vma) + sizeof (char);
1806 local_got_refcounts = ((bfd_signed_vma *)
1807 bfd_zalloc (abfd, size));
1808 if (local_got_refcounts == NULL)
1810 elf_local_got_refcounts (abfd) = local_got_refcounts;
1811 elf_x86_64_local_tlsdesc_gotent (abfd)
1812 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1813 elf_x86_64_local_got_tls_type (abfd)
1814 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1816 local_got_refcounts[r_symndx] += 1;
1818 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1821 /* If a TLS symbol is accessed using IE at least once,
1822 there is no point to use dynamic model for it. */
1823 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1824 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1825 || tls_type != GOT_TLS_IE))
1827 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1828 tls_type = old_tls_type;
1829 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1830 && GOT_TLS_GD_ANY_P (tls_type))
1831 tls_type |= old_tls_type;
1835 name = h->root.root.string;
1837 name = bfd_elf_sym_name (abfd, symtab_hdr,
1839 (*_bfd_error_handler)
1840 (_("%B: '%s' accessed both as normal and thread local symbol"),
1842 bfd_set_error (bfd_error_bad_value);
1847 if (old_tls_type != tls_type)
1850 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1852 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1857 case R_X86_64_GOTOFF64:
1858 case R_X86_64_GOTPC32:
1859 case R_X86_64_GOTPC64:
1861 if (htab->elf.sgot == NULL)
1863 if (htab->elf.dynobj == NULL)
1864 htab->elf.dynobj = abfd;
1865 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1871 case R_X86_64_PLT32:
1872 case R_X86_64_PLT32_BND:
1873 /* This symbol requires a procedure linkage table entry. We
1874 actually build the entry in adjust_dynamic_symbol,
1875 because this might be a case of linking PIC code which is
1876 never referenced by a dynamic object, in which case we
1877 don't need to generate a procedure linkage table entry
1880 /* If this is a local symbol, we resolve it directly without
1881 creating a procedure linkage table entry. */
1886 h->plt.refcount += 1;
1889 case R_X86_64_PLTOFF64:
1890 /* This tries to form the 'address' of a function relative
1891 to GOT. For global symbols we need a PLT entry. */
1895 h->plt.refcount += 1;
1899 case R_X86_64_SIZE32:
1900 case R_X86_64_SIZE64:
1905 if (!ABI_64_P (abfd))
1910 /* Let's help debug shared library creation. These relocs
1911 cannot be used in shared libs. Don't error out for
1912 sections we don't care about, such as debug sections or
1913 non-constant sections. */
1915 && (sec->flags & SEC_ALLOC) != 0
1916 && (sec->flags & SEC_READONLY) != 0)
1919 name = h->root.root.string;
1921 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1922 (*_bfd_error_handler)
1923 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1924 abfd, x86_64_elf_howto_table[r_type].name, name);
1925 bfd_set_error (bfd_error_bad_value);
1933 case R_X86_64_PC32_BND:
1937 if (h != NULL && info->executable)
1939 /* If this reloc is in a read-only section, we might
1940 need a copy reloc. We can't check reliably at this
1941 stage whether the section is read-only, as input
1942 sections have not yet been mapped to output sections.
1943 Tentatively set the flag for now, and correct in
1944 adjust_dynamic_symbol. */
1947 /* We may need a .plt entry if the function this reloc
1948 refers to is in a shared lib. */
1949 h->plt.refcount += 1;
1950 if (r_type != R_X86_64_PC32
1951 && r_type != R_X86_64_PC32_BND
1952 && r_type != R_X86_64_PC64)
1953 h->pointer_equality_needed = 1;
1958 /* If we are creating a shared library, and this is a reloc
1959 against a global symbol, or a non PC relative reloc
1960 against a local symbol, then we need to copy the reloc
1961 into the shared library. However, if we are linking with
1962 -Bsymbolic, we do not need to copy a reloc against a
1963 global symbol which is defined in an object we are
1964 including in the link (i.e., DEF_REGULAR is set). At
1965 this point we have not seen all the input files, so it is
1966 possible that DEF_REGULAR is not set now but will be set
1967 later (it is never cleared). In case of a weak definition,
1968 DEF_REGULAR may be cleared later by a strong definition in
1969 a shared library. We account for that possibility below by
1970 storing information in the relocs_copied field of the hash
1971 table entry. A similar situation occurs when creating
1972 shared libraries and symbol visibility changes render the
1975 If on the other hand, we are creating an executable, we
1976 may need to keep relocations for symbols satisfied by a
1977 dynamic library if we manage to avoid copy relocs for the
1980 && (sec->flags & SEC_ALLOC) != 0
1981 && (! IS_X86_64_PCREL_TYPE (r_type)
1983 && (! SYMBOLIC_BIND (info, h)
1984 || h->root.type == bfd_link_hash_defweak
1985 || !h->def_regular))))
1986 || (ELIMINATE_COPY_RELOCS
1988 && (sec->flags & SEC_ALLOC) != 0
1990 && (h->root.type == bfd_link_hash_defweak
1991 || !h->def_regular)))
1993 struct elf_dyn_relocs *p;
1994 struct elf_dyn_relocs **head;
1996 /* We must copy these reloc types into the output file.
1997 Create a reloc section in dynobj and make room for
2001 if (htab->elf.dynobj == NULL)
2002 htab->elf.dynobj = abfd;
2004 sreloc = _bfd_elf_make_dynamic_reloc_section
2005 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2006 abfd, /*rela?*/ TRUE);
2012 /* If this is a global symbol, we count the number of
2013 relocations we need for this symbol. */
2016 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
2020 /* Track dynamic relocs needed for local syms too.
2021 We really need local syms available to do this
2026 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2031 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2035 /* Beware of type punned pointers vs strict aliasing
2037 vpp = &(elf_section_data (s)->local_dynrel);
2038 head = (struct elf_dyn_relocs **)vpp;
2042 if (p == NULL || p->sec != sec)
2044 bfd_size_type amt = sizeof *p;
2046 p = ((struct elf_dyn_relocs *)
2047 bfd_alloc (htab->elf.dynobj, amt));
2058 /* Count size relocation as PC-relative relocation. */
2059 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2064 /* This relocation describes the C++ object vtable hierarchy.
2065 Reconstruct it for later use during GC. */
2066 case R_X86_64_GNU_VTINHERIT:
2067 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2071 /* This relocation describes which C++ vtable entries are actually
2072 used. Record for later use during GC. */
2073 case R_X86_64_GNU_VTENTRY:
2074 BFD_ASSERT (h != NULL);
2076 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2086 && h->plt.refcount > 0
2087 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2088 || h->got.refcount > 0)
2089 && htab->plt_got == NULL)
2091 /* Create the GOT procedure linkage table. */
2092 unsigned int plt_got_align;
2093 const struct elf_backend_data *bed;
2095 bed = get_elf_backend_data (info->output_bfd);
2096 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry) == 8
2097 && (sizeof (elf_x86_64_bnd_plt2_entry)
2098 == sizeof (elf_x86_64_legacy_plt2_entry)));
2101 if (htab->elf.dynobj == NULL)
2102 htab->elf.dynobj = abfd;
2104 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2106 (bed->dynamic_sec_flags
2111 if (htab->plt_got == NULL
2112 || !bfd_set_section_alignment (htab->elf.dynobj,
2118 if (r_type == R_X86_64_GOTPCREL
2119 && (h == NULL || h->type != STT_GNU_IFUNC))
2120 sec->need_convert_mov_to_lea = 1;
2126 /* Return the section that should be marked against GC for a given
2130 elf_x86_64_gc_mark_hook (asection *sec,
2131 struct bfd_link_info *info,
2132 Elf_Internal_Rela *rel,
2133 struct elf_link_hash_entry *h,
2134 Elf_Internal_Sym *sym)
2137 switch (ELF32_R_TYPE (rel->r_info))
2139 case R_X86_64_GNU_VTINHERIT:
2140 case R_X86_64_GNU_VTENTRY:
2144 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2147 /* Update the got entry reference counts for the section being removed. */
2150 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
2152 const Elf_Internal_Rela *relocs)
2154 struct elf_x86_64_link_hash_table *htab;
2155 Elf_Internal_Shdr *symtab_hdr;
2156 struct elf_link_hash_entry **sym_hashes;
2157 bfd_signed_vma *local_got_refcounts;
2158 const Elf_Internal_Rela *rel, *relend;
2160 if (info->relocatable)
2163 htab = elf_x86_64_hash_table (info);
2167 elf_section_data (sec)->local_dynrel = NULL;
2169 symtab_hdr = &elf_symtab_hdr (abfd);
2170 sym_hashes = elf_sym_hashes (abfd);
2171 local_got_refcounts = elf_local_got_refcounts (abfd);
2173 htab = elf_x86_64_hash_table (info);
2174 relend = relocs + sec->reloc_count;
2175 for (rel = relocs; rel < relend; rel++)
2177 unsigned long r_symndx;
2178 unsigned int r_type;
2179 struct elf_link_hash_entry *h = NULL;
2181 r_symndx = htab->r_sym (rel->r_info);
2182 if (r_symndx >= symtab_hdr->sh_info)
2184 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2185 while (h->root.type == bfd_link_hash_indirect
2186 || h->root.type == bfd_link_hash_warning)
2187 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2191 /* A local symbol. */
2192 Elf_Internal_Sym *isym;
2194 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2197 /* Check relocation against local STT_GNU_IFUNC symbol. */
2199 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2201 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2209 struct elf_x86_64_link_hash_entry *eh;
2210 struct elf_dyn_relocs **pp;
2211 struct elf_dyn_relocs *p;
2213 eh = (struct elf_x86_64_link_hash_entry *) h;
2215 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2218 /* Everything must go for SEC. */
2224 r_type = ELF32_R_TYPE (rel->r_info);
2225 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2226 symtab_hdr, sym_hashes,
2227 &r_type, GOT_UNKNOWN,
2228 rel, relend, h, r_symndx))
2233 case R_X86_64_TLSLD:
2234 if (htab->tls_ld_got.refcount > 0)
2235 htab->tls_ld_got.refcount -= 1;
2238 case R_X86_64_TLSGD:
2239 case R_X86_64_GOTPC32_TLSDESC:
2240 case R_X86_64_TLSDESC_CALL:
2241 case R_X86_64_GOTTPOFF:
2242 case R_X86_64_GOT32:
2243 case R_X86_64_GOTPCREL:
2244 case R_X86_64_GOT64:
2245 case R_X86_64_GOTPCREL64:
2246 case R_X86_64_GOTPLT64:
2249 if (h->got.refcount > 0)
2250 h->got.refcount -= 1;
2251 if (h->type == STT_GNU_IFUNC)
2253 if (h->plt.refcount > 0)
2254 h->plt.refcount -= 1;
2257 else if (local_got_refcounts != NULL)
2259 if (local_got_refcounts[r_symndx] > 0)
2260 local_got_refcounts[r_symndx] -= 1;
2272 case R_X86_64_PC32_BND:
2274 case R_X86_64_SIZE32:
2275 case R_X86_64_SIZE64:
2277 && (h == NULL || h->type != STT_GNU_IFUNC))
2281 case R_X86_64_PLT32:
2282 case R_X86_64_PLT32_BND:
2283 case R_X86_64_PLTOFF64:
2286 if (h->plt.refcount > 0)
2287 h->plt.refcount -= 1;
2299 /* Adjust a symbol defined by a dynamic object and referenced by a
2300 regular object. The current definition is in some section of the
2301 dynamic object, but we're not including those sections. We have to
2302 change the definition to something the rest of the link can
2306 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2307 struct elf_link_hash_entry *h)
2309 struct elf_x86_64_link_hash_table *htab;
2311 struct elf_x86_64_link_hash_entry *eh;
2312 struct elf_dyn_relocs *p;
2314 /* STT_GNU_IFUNC symbol must go through PLT. */
2315 if (h->type == STT_GNU_IFUNC)
2317 /* All local STT_GNU_IFUNC references must be treate as local
2318 calls via local PLT. */
2320 && SYMBOL_CALLS_LOCAL (info, h))
2322 bfd_size_type pc_count = 0, count = 0;
2323 struct elf_dyn_relocs **pp;
2325 eh = (struct elf_x86_64_link_hash_entry *) h;
2326 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2328 pc_count += p->pc_count;
2329 p->count -= p->pc_count;
2338 if (pc_count || count)
2342 if (h->plt.refcount <= 0)
2343 h->plt.refcount = 1;
2345 h->plt.refcount += 1;
2349 if (h->plt.refcount <= 0)
2351 h->plt.offset = (bfd_vma) -1;
2357 /* If this is a function, put it in the procedure linkage table. We
2358 will fill in the contents of the procedure linkage table later,
2359 when we know the address of the .got section. */
2360 if (h->type == STT_FUNC
2363 if (h->plt.refcount <= 0
2364 || SYMBOL_CALLS_LOCAL (info, h)
2365 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2366 && h->root.type == bfd_link_hash_undefweak))
2368 /* This case can occur if we saw a PLT32 reloc in an input
2369 file, but the symbol was never referred to by a dynamic
2370 object, or if all references were garbage collected. In
2371 such a case, we don't actually need to build a procedure
2372 linkage table, and we can just do a PC32 reloc instead. */
2373 h->plt.offset = (bfd_vma) -1;
2380 /* It's possible that we incorrectly decided a .plt reloc was
2381 needed for an R_X86_64_PC32 reloc to a non-function sym in
2382 check_relocs. We can't decide accurately between function and
2383 non-function syms in check-relocs; Objects loaded later in
2384 the link may change h->type. So fix it now. */
2385 h->plt.offset = (bfd_vma) -1;
2387 /* If this is a weak symbol, and there is a real definition, the
2388 processor independent code will have arranged for us to see the
2389 real definition first, and we can just use the same value. */
2390 if (h->u.weakdef != NULL)
2392 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2393 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2394 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2395 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2396 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2398 eh = (struct elf_x86_64_link_hash_entry *) h;
2399 h->non_got_ref = h->u.weakdef->non_got_ref;
2400 eh->needs_copy = h->u.weakdef->needs_copy;
2405 /* This is a reference to a symbol defined by a dynamic object which
2406 is not a function. */
2408 /* If we are creating a shared library, we must presume that the
2409 only references to the symbol are via the global offset table.
2410 For such cases we need not do anything here; the relocations will
2411 be handled correctly by relocate_section. */
2412 if (!info->executable)
2415 /* If there are no references to this symbol that do not use the
2416 GOT, we don't need to generate a copy reloc. */
2417 if (!h->non_got_ref)
2420 /* If -z nocopyreloc was given, we won't generate them either. */
2421 if (info->nocopyreloc)
2427 if (ELIMINATE_COPY_RELOCS)
2429 eh = (struct elf_x86_64_link_hash_entry *) h;
2430 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2432 s = p->sec->output_section;
2433 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2437 /* If we didn't find any dynamic relocs in read-only sections, then
2438 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2446 /* We must allocate the symbol in our .dynbss section, which will
2447 become part of the .bss section of the executable. There will be
2448 an entry for this symbol in the .dynsym section. The dynamic
2449 object will contain position independent code, so all references
2450 from the dynamic object to this symbol will go through the global
2451 offset table. The dynamic linker will use the .dynsym entry to
2452 determine the address it must put in the global offset table, so
2453 both the dynamic object and the regular object will refer to the
2454 same memory location for the variable. */
2456 htab = elf_x86_64_hash_table (info);
2460 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2461 to copy the initial value out of the dynamic object and into the
2462 runtime process image. */
2463 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2465 const struct elf_backend_data *bed;
2466 bed = get_elf_backend_data (info->output_bfd);
2467 htab->srelbss->size += bed->s->sizeof_rela;
2473 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2476 /* Allocate space in .plt, .got and associated reloc sections for
2480 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2482 struct bfd_link_info *info;
2483 struct elf_x86_64_link_hash_table *htab;
2484 struct elf_x86_64_link_hash_entry *eh;
2485 struct elf_dyn_relocs *p;
2486 const struct elf_backend_data *bed;
2487 unsigned int plt_entry_size;
2489 if (h->root.type == bfd_link_hash_indirect)
2492 eh = (struct elf_x86_64_link_hash_entry *) h;
2494 info = (struct bfd_link_info *) inf;
2495 htab = elf_x86_64_hash_table (info);
2498 bed = get_elf_backend_data (info->output_bfd);
2499 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2501 /* We can't use the GOT PLT if pointer equality is needed since
2502 finish_dynamic_symbol won't clear symbol value and the dynamic
2503 linker won't update the GOT slot. We will get into an infinite
2504 loop at run-time. */
2505 if (htab->plt_got != NULL
2506 && h->type != STT_GNU_IFUNC
2507 && !h->pointer_equality_needed
2508 && h->plt.refcount > 0
2509 && h->got.refcount > 0)
2511 /* Don't use the regular PLT if there are both GOT and GOTPLT
2513 h->plt.offset = (bfd_vma) -1;
2515 /* Use the GOT PLT. */
2516 eh->plt_got.refcount = 1;
2519 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2520 here if it is defined and referenced in a non-shared object. */
2521 if (h->type == STT_GNU_IFUNC
2524 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2530 asection *s = htab->plt_bnd;
2531 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2533 /* Use the .plt.bnd section if it is created. */
2534 eh->plt_bnd.offset = s->size;
2536 /* Make room for this entry in the .plt.bnd section. */
2537 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2545 else if (htab->elf.dynamic_sections_created
2546 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2548 bfd_boolean use_plt_got;
2550 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2552 /* Don't use the regular PLT for DF_BIND_NOW. */
2553 h->plt.offset = (bfd_vma) -1;
2555 /* Use the GOT PLT. */
2556 h->got.refcount = 1;
2557 eh->plt_got.refcount = 1;
2560 use_plt_got = eh->plt_got.refcount > 0;
2562 /* Make sure this symbol is output as a dynamic symbol.
2563 Undefined weak syms won't yet be marked as dynamic. */
2564 if (h->dynindx == -1
2565 && !h->forced_local)
2567 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2572 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2574 asection *s = htab->elf.splt;
2575 asection *bnd_s = htab->plt_bnd;
2576 asection *got_s = htab->plt_got;
2578 /* If this is the first .plt entry, make room for the special
2579 first entry. The .plt section is used by prelink to undo
2580 prelinking for dynamic relocations. */
2582 s->size = plt_entry_size;
2585 eh->plt_got.offset = got_s->size;
2588 h->plt.offset = s->size;
2590 eh->plt_bnd.offset = bnd_s->size;
2593 /* If this symbol is not defined in a regular file, and we are
2594 not generating a shared library, then set the symbol to this
2595 location in the .plt. This is required to make function
2596 pointers compare as equal between the normal executable and
2597 the shared library. */
2603 /* We need to make a call to the entry of the GOT PLT
2604 instead of regular PLT entry. */
2605 h->root.u.def.section = got_s;
2606 h->root.u.def.value = eh->plt_got.offset;
2612 /* We need to make a call to the entry of the second
2613 PLT instead of regular PLT entry. */
2614 h->root.u.def.section = bnd_s;
2615 h->root.u.def.value = eh->plt_bnd.offset;
2619 h->root.u.def.section = s;
2620 h->root.u.def.value = h->plt.offset;
2625 /* Make room for this entry. */
2627 got_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2630 s->size += plt_entry_size;
2632 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2634 /* We also need to make an entry in the .got.plt section,
2635 which will be placed in the .got section by the linker
2637 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2639 /* We also need to make an entry in the .rela.plt
2641 htab->elf.srelplt->size += bed->s->sizeof_rela;
2642 htab->elf.srelplt->reloc_count++;
2647 h->plt.offset = (bfd_vma) -1;
2653 h->plt.offset = (bfd_vma) -1;
2657 eh->tlsdesc_got = (bfd_vma) -1;
2659 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2660 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2661 if (h->got.refcount > 0
2664 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2666 h->got.offset = (bfd_vma) -1;
2668 else if (h->got.refcount > 0)
2672 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2674 /* Make sure this symbol is output as a dynamic symbol.
2675 Undefined weak syms won't yet be marked as dynamic. */
2676 if (h->dynindx == -1
2677 && !h->forced_local)
2679 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2683 if (GOT_TLS_GDESC_P (tls_type))
2685 eh->tlsdesc_got = htab->elf.sgotplt->size
2686 - elf_x86_64_compute_jump_table_size (htab);
2687 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2688 h->got.offset = (bfd_vma) -2;
2690 if (! GOT_TLS_GDESC_P (tls_type)
2691 || GOT_TLS_GD_P (tls_type))
2694 h->got.offset = s->size;
2695 s->size += GOT_ENTRY_SIZE;
2696 if (GOT_TLS_GD_P (tls_type))
2697 s->size += GOT_ENTRY_SIZE;
2699 dyn = htab->elf.dynamic_sections_created;
2700 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2702 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2703 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2704 || tls_type == GOT_TLS_IE)
2705 htab->elf.srelgot->size += bed->s->sizeof_rela;
2706 else if (GOT_TLS_GD_P (tls_type))
2707 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2708 else if (! GOT_TLS_GDESC_P (tls_type)
2709 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2710 || h->root.type != bfd_link_hash_undefweak)
2712 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2713 htab->elf.srelgot->size += bed->s->sizeof_rela;
2714 if (GOT_TLS_GDESC_P (tls_type))
2716 htab->elf.srelplt->size += bed->s->sizeof_rela;
2717 htab->tlsdesc_plt = (bfd_vma) -1;
2721 h->got.offset = (bfd_vma) -1;
2723 if (eh->dyn_relocs == NULL)
2726 /* In the shared -Bsymbolic case, discard space allocated for
2727 dynamic pc-relative relocs against symbols which turn out to be
2728 defined in regular objects. For the normal shared case, discard
2729 space for pc-relative relocs that have become local due to symbol
2730 visibility changes. */
2734 /* Relocs that use pc_count are those that appear on a call
2735 insn, or certain REL relocs that can generated via assembly.
2736 We want calls to protected symbols to resolve directly to the
2737 function rather than going via the plt. If people want
2738 function pointer comparisons to work as expected then they
2739 should avoid writing weird assembly. */
2740 if (SYMBOL_CALLS_LOCAL (info, h))
2742 struct elf_dyn_relocs **pp;
2744 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2746 p->count -= p->pc_count;
2755 /* Also discard relocs on undefined weak syms with non-default
2757 if (eh->dyn_relocs != NULL)
2759 if (h->root.type == bfd_link_hash_undefweak)
2761 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2762 eh->dyn_relocs = NULL;
2764 /* Make sure undefined weak symbols are output as a dynamic
2766 else if (h->dynindx == -1
2767 && ! h->forced_local
2768 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2771 /* For PIE, discard space for pc-relative relocs against
2772 symbols which turn out to need copy relocs. */
2773 else if (info->executable
2774 && (h->needs_copy || eh->needs_copy)
2778 struct elf_dyn_relocs **pp;
2780 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2782 if (p->pc_count != 0)
2790 else if (ELIMINATE_COPY_RELOCS)
2792 /* For the non-shared case, discard space for relocs against
2793 symbols which turn out to need copy relocs or are not
2799 || (htab->elf.dynamic_sections_created
2800 && (h->root.type == bfd_link_hash_undefweak
2801 || h->root.type == bfd_link_hash_undefined))))
2803 /* Make sure this symbol is output as a dynamic symbol.
2804 Undefined weak syms won't yet be marked as dynamic. */
2805 if (h->dynindx == -1
2806 && ! h->forced_local
2807 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2810 /* If that succeeded, we know we'll be keeping all the
2812 if (h->dynindx != -1)
2816 eh->dyn_relocs = NULL;
2821 /* Finally, allocate space. */
2822 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2826 sreloc = elf_section_data (p->sec)->sreloc;
2828 BFD_ASSERT (sreloc != NULL);
2830 sreloc->size += p->count * bed->s->sizeof_rela;
2836 /* Allocate space in .plt, .got and associated reloc sections for
2837 local dynamic relocs. */
2840 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2842 struct elf_link_hash_entry *h
2843 = (struct elf_link_hash_entry *) *slot;
2845 if (h->type != STT_GNU_IFUNC
2849 || h->root.type != bfd_link_hash_defined)
2852 return elf_x86_64_allocate_dynrelocs (h, inf);
2855 /* Find any dynamic relocs that apply to read-only sections. */
2858 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2861 struct elf_x86_64_link_hash_entry *eh;
2862 struct elf_dyn_relocs *p;
2864 /* Skip local IFUNC symbols. */
2865 if (h->forced_local && h->type == STT_GNU_IFUNC)
2868 eh = (struct elf_x86_64_link_hash_entry *) h;
2869 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2871 asection *s = p->sec->output_section;
2873 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2875 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2877 info->flags |= DF_TEXTREL;
2879 if ((info->warn_shared_textrel && info->shared)
2880 || info->error_textrel)
2881 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2882 p->sec->owner, h->root.root.string,
2885 /* Not an error, just cut short the traversal. */
2893 mov foo@GOTPCREL(%rip), %reg
2896 with the local symbol, foo. */
2899 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2900 struct bfd_link_info *link_info)
2902 Elf_Internal_Shdr *symtab_hdr;
2903 Elf_Internal_Rela *internal_relocs;
2904 Elf_Internal_Rela *irel, *irelend;
2906 struct elf_x86_64_link_hash_table *htab;
2907 bfd_boolean changed_contents;
2908 bfd_boolean changed_relocs;
2909 bfd_signed_vma *local_got_refcounts;
2910 bfd_vma maxpagesize;
2912 /* Don't even try to convert non-ELF outputs. */
2913 if (!is_elf_hash_table (link_info->hash))
2916 /* Nothing to do if there is no need or no output. */
2917 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2918 || sec->need_convert_mov_to_lea == 0
2919 || bfd_is_abs_section (sec->output_section))
2922 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2924 /* Load the relocations for this section. */
2925 internal_relocs = (_bfd_elf_link_read_relocs
2926 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2927 link_info->keep_memory));
2928 if (internal_relocs == NULL)
2931 htab = elf_x86_64_hash_table (link_info);
2932 changed_contents = FALSE;
2933 changed_relocs = FALSE;
2934 local_got_refcounts = elf_local_got_refcounts (abfd);
2935 maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
2937 /* Get the section contents. */
2938 if (elf_section_data (sec)->this_hdr.contents != NULL)
2939 contents = elf_section_data (sec)->this_hdr.contents;
2942 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2946 irelend = internal_relocs + sec->reloc_count;
2947 for (irel = internal_relocs; irel < irelend; irel++)
2949 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2950 unsigned int r_symndx = htab->r_sym (irel->r_info);
2952 struct elf_link_hash_entry *h;
2958 } convert_mov_to_lea;
2959 unsigned int opcode;
2961 if (r_type != R_X86_64_GOTPCREL)
2964 roff = irel->r_offset;
2969 opcode = bfd_get_8 (abfd, contents + roff - 2);
2971 /* PR ld/18591: Don't convert R_X86_64_GOTPCREL relocation if it
2972 isn't for mov instruction. */
2977 convert_mov_to_lea = none;
2979 /* Get the symbol referred to by the reloc. */
2980 if (r_symndx < symtab_hdr->sh_info)
2982 Elf_Internal_Sym *isym;
2984 /* Silence older GCC warning. */
2987 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2990 symtype = ELF_ST_TYPE (isym->st_info);
2992 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation and
2993 skip relocation against undefined symbols. */
2994 if (symtype != STT_GNU_IFUNC && isym->st_shndx != SHN_UNDEF)
2996 if (isym->st_shndx == SHN_ABS)
2997 tsec = bfd_abs_section_ptr;
2998 else if (isym->st_shndx == SHN_COMMON)
2999 tsec = bfd_com_section_ptr;
3000 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
3001 tsec = &_bfd_elf_large_com_section;
3003 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3005 toff = isym->st_value;
3006 convert_mov_to_lea = local;
3011 indx = r_symndx - symtab_hdr->sh_info;
3012 h = elf_sym_hashes (abfd)[indx];
3013 BFD_ASSERT (h != NULL);
3015 while (h->root.type == bfd_link_hash_indirect
3016 || h->root.type == bfd_link_hash_warning)
3017 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3019 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
3020 avoid optimizing _DYNAMIC since ld.so may use its link-time
3023 && h->type != STT_GNU_IFUNC
3024 && h != htab->elf.hdynamic
3025 && SYMBOL_REFERENCES_LOCAL (link_info, h))
3027 tsec = h->root.u.def.section;
3028 toff = h->root.u.def.value;
3030 convert_mov_to_lea = global;
3034 if (convert_mov_to_lea == none)
3037 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
3039 /* At this stage in linking, no SEC_MERGE symbol has been
3040 adjusted, so all references to such symbols need to be
3041 passed through _bfd_merged_section_offset. (Later, in
3042 relocate_section, all SEC_MERGE symbols *except* for
3043 section symbols have been adjusted.)
3045 gas may reduce relocations against symbols in SEC_MERGE
3046 sections to a relocation against the section symbol when
3047 the original addend was zero. When the reloc is against
3048 a section symbol we should include the addend in the
3049 offset passed to _bfd_merged_section_offset, since the
3050 location of interest is the original symbol. On the
3051 other hand, an access to "sym+addend" where "sym" is not
3052 a section symbol should not include the addend; Such an
3053 access is presumed to be an offset from "sym"; The
3054 location of interest is just "sym". */
3055 if (symtype == STT_SECTION)
3056 toff += irel->r_addend;
3058 toff = _bfd_merged_section_offset (abfd, &tsec,
3059 elf_section_data (tsec)->sec_info,
3062 if (symtype != STT_SECTION)
3063 toff += irel->r_addend;
3066 toff += irel->r_addend;
3068 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3069 if (tsec->output_section == sec->output_section)
3071 if ((toff - roff + 0x80000000) > 0xffffffff)
3079 /* At this point, we don't know the load addresses of TSEC
3080 section nor SEC section. We estimate the distrance between
3083 for (asect = sec->output_section;
3084 asect != NULL && asect != tsec->output_section;
3085 asect = asect->next)
3088 for (i = asect->output_section->map_head.s;
3092 size = align_power (size, i->alignment_power);
3097 /* Don't convert R_X86_64_GOTPCREL if TSEC isn't placed after
3102 /* Take PT_GNU_RELRO segment into account by adding
3104 if ((toff + size + maxpagesize - roff + 0x80000000)
3109 bfd_put_8 (abfd, 0x8d, contents + roff - 2);
3110 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
3111 changed_contents = TRUE;
3112 changed_relocs = TRUE;
3114 if (convert_mov_to_lea == local)
3116 if (local_got_refcounts != NULL
3117 && local_got_refcounts[r_symndx] > 0)
3118 local_got_refcounts[r_symndx] -= 1;
3122 if (h->got.refcount > 0)
3123 h->got.refcount -= 1;
3127 if (contents != NULL
3128 && elf_section_data (sec)->this_hdr.contents != contents)
3130 if (!changed_contents && !link_info->keep_memory)
3134 /* Cache the section contents for elf_link_input_bfd. */
3135 elf_section_data (sec)->this_hdr.contents = contents;
3139 if (elf_section_data (sec)->relocs != internal_relocs)
3141 if (!changed_relocs)
3142 free (internal_relocs);
3144 elf_section_data (sec)->relocs = internal_relocs;
3150 if (contents != NULL
3151 && elf_section_data (sec)->this_hdr.contents != contents)
3153 if (internal_relocs != NULL
3154 && elf_section_data (sec)->relocs != internal_relocs)
3155 free (internal_relocs);
3159 /* Set the sizes of the dynamic sections. */
3162 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3163 struct bfd_link_info *info)
3165 struct elf_x86_64_link_hash_table *htab;
3170 const struct elf_backend_data *bed;
3172 htab = elf_x86_64_hash_table (info);
3175 bed = get_elf_backend_data (output_bfd);
3177 dynobj = htab->elf.dynobj;
3181 if (htab->elf.dynamic_sections_created)
3183 /* Set the contents of the .interp section to the interpreter. */
3184 if (info->executable)
3186 s = bfd_get_linker_section (dynobj, ".interp");
3189 s->size = htab->dynamic_interpreter_size;
3190 s->contents = (unsigned char *) htab->dynamic_interpreter;
3194 /* Set up .got offsets for local syms, and space for local dynamic
3196 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3198 bfd_signed_vma *local_got;
3199 bfd_signed_vma *end_local_got;
3200 char *local_tls_type;
3201 bfd_vma *local_tlsdesc_gotent;
3202 bfd_size_type locsymcount;
3203 Elf_Internal_Shdr *symtab_hdr;
3206 if (! is_x86_64_elf (ibfd))
3209 for (s = ibfd->sections; s != NULL; s = s->next)
3211 struct elf_dyn_relocs *p;
3213 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
3216 for (p = (struct elf_dyn_relocs *)
3217 (elf_section_data (s)->local_dynrel);
3221 if (!bfd_is_abs_section (p->sec)
3222 && bfd_is_abs_section (p->sec->output_section))
3224 /* Input section has been discarded, either because
3225 it is a copy of a linkonce section or due to
3226 linker script /DISCARD/, so we'll be discarding
3229 else if (p->count != 0)
3231 srel = elf_section_data (p->sec)->sreloc;
3232 srel->size += p->count * bed->s->sizeof_rela;
3233 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3234 && (info->flags & DF_TEXTREL) == 0)
3236 info->flags |= DF_TEXTREL;
3237 if ((info->warn_shared_textrel && info->shared)
3238 || info->error_textrel)
3239 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3240 p->sec->owner, p->sec);
3246 local_got = elf_local_got_refcounts (ibfd);
3250 symtab_hdr = &elf_symtab_hdr (ibfd);
3251 locsymcount = symtab_hdr->sh_info;
3252 end_local_got = local_got + locsymcount;
3253 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3254 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3256 srel = htab->elf.srelgot;
3257 for (; local_got < end_local_got;
3258 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3260 *local_tlsdesc_gotent = (bfd_vma) -1;
3263 if (GOT_TLS_GDESC_P (*local_tls_type))
3265 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3266 - elf_x86_64_compute_jump_table_size (htab);
3267 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3268 *local_got = (bfd_vma) -2;
3270 if (! GOT_TLS_GDESC_P (*local_tls_type)
3271 || GOT_TLS_GD_P (*local_tls_type))
3273 *local_got = s->size;
3274 s->size += GOT_ENTRY_SIZE;
3275 if (GOT_TLS_GD_P (*local_tls_type))
3276 s->size += GOT_ENTRY_SIZE;
3279 || GOT_TLS_GD_ANY_P (*local_tls_type)
3280 || *local_tls_type == GOT_TLS_IE)
3282 if (GOT_TLS_GDESC_P (*local_tls_type))
3284 htab->elf.srelplt->size
3285 += bed->s->sizeof_rela;
3286 htab->tlsdesc_plt = (bfd_vma) -1;
3288 if (! GOT_TLS_GDESC_P (*local_tls_type)
3289 || GOT_TLS_GD_P (*local_tls_type))
3290 srel->size += bed->s->sizeof_rela;
3294 *local_got = (bfd_vma) -1;
3298 if (htab->tls_ld_got.refcount > 0)
3300 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3302 htab->tls_ld_got.offset = htab->elf.sgot->size;
3303 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3304 htab->elf.srelgot->size += bed->s->sizeof_rela;
3307 htab->tls_ld_got.offset = -1;
3309 /* Allocate global sym .plt and .got entries, and space for global
3310 sym dynamic relocs. */
3311 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3314 /* Allocate .plt and .got entries, and space for local symbols. */
3315 htab_traverse (htab->loc_hash_table,
3316 elf_x86_64_allocate_local_dynrelocs,
3319 /* For every jump slot reserved in the sgotplt, reloc_count is
3320 incremented. However, when we reserve space for TLS descriptors,
3321 it's not incremented, so in order to compute the space reserved
3322 for them, it suffices to multiply the reloc count by the jump
3325 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3326 so that R_X86_64_IRELATIVE entries come last. */
3327 if (htab->elf.srelplt)
3329 htab->sgotplt_jump_table_size
3330 = elf_x86_64_compute_jump_table_size (htab);
3331 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3333 else if (htab->elf.irelplt)
3334 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3336 if (htab->tlsdesc_plt)
3338 /* If we're not using lazy TLS relocations, don't generate the
3339 PLT and GOT entries they require. */
3340 if ((info->flags & DF_BIND_NOW))
3341 htab->tlsdesc_plt = 0;
3344 htab->tlsdesc_got = htab->elf.sgot->size;
3345 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3346 /* Reserve room for the initial entry.
3347 FIXME: we could probably do away with it in this case. */
3348 if (htab->elf.splt->size == 0)
3349 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3350 htab->tlsdesc_plt = htab->elf.splt->size;
3351 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3355 if (htab->elf.sgotplt)
3357 /* Don't allocate .got.plt section if there are no GOT nor PLT
3358 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3359 if ((htab->elf.hgot == NULL
3360 || !htab->elf.hgot->ref_regular_nonweak)
3361 && (htab->elf.sgotplt->size
3362 == get_elf_backend_data (output_bfd)->got_header_size)
3363 && (htab->elf.splt == NULL
3364 || htab->elf.splt->size == 0)
3365 && (htab->elf.sgot == NULL
3366 || htab->elf.sgot->size == 0)
3367 && (htab->elf.iplt == NULL
3368 || htab->elf.iplt->size == 0)
3369 && (htab->elf.igotplt == NULL
3370 || htab->elf.igotplt->size == 0))
3371 htab->elf.sgotplt->size = 0;
3374 if (htab->plt_eh_frame != NULL
3375 && htab->elf.splt != NULL
3376 && htab->elf.splt->size != 0
3377 && !bfd_is_abs_section (htab->elf.splt->output_section)
3378 && _bfd_elf_eh_frame_present (info))
3380 const struct elf_x86_64_backend_data *arch_data
3381 = get_elf_x86_64_arch_data (bed);
3382 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3385 /* We now have determined the sizes of the various dynamic sections.
3386 Allocate memory for them. */
3388 for (s = dynobj->sections; s != NULL; s = s->next)
3390 if ((s->flags & SEC_LINKER_CREATED) == 0)
3393 if (s == htab->elf.splt
3394 || s == htab->elf.sgot
3395 || s == htab->elf.sgotplt
3396 || s == htab->elf.iplt
3397 || s == htab->elf.igotplt
3398 || s == htab->plt_bnd
3399 || s == htab->plt_got
3400 || s == htab->plt_eh_frame
3401 || s == htab->sdynbss)
3403 /* Strip this section if we don't need it; see the
3406 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3408 if (s->size != 0 && s != htab->elf.srelplt)
3411 /* We use the reloc_count field as a counter if we need
3412 to copy relocs into the output file. */
3413 if (s != htab->elf.srelplt)
3418 /* It's not one of our sections, so don't allocate space. */
3424 /* If we don't need this section, strip it from the
3425 output file. This is mostly to handle .rela.bss and
3426 .rela.plt. We must create both sections in
3427 create_dynamic_sections, because they must be created
3428 before the linker maps input sections to output
3429 sections. The linker does that before
3430 adjust_dynamic_symbol is called, and it is that
3431 function which decides whether anything needs to go
3432 into these sections. */
3434 s->flags |= SEC_EXCLUDE;
3438 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3441 /* Allocate memory for the section contents. We use bfd_zalloc
3442 here in case unused entries are not reclaimed before the
3443 section's contents are written out. This should not happen,
3444 but this way if it does, we get a R_X86_64_NONE reloc instead
3446 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3447 if (s->contents == NULL)
3451 if (htab->plt_eh_frame != NULL
3452 && htab->plt_eh_frame->contents != NULL)
3454 const struct elf_x86_64_backend_data *arch_data
3455 = get_elf_x86_64_arch_data (bed);
3457 memcpy (htab->plt_eh_frame->contents,
3458 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3459 bfd_put_32 (dynobj, htab->elf.splt->size,
3460 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3463 if (htab->elf.dynamic_sections_created)
3465 /* Add some entries to the .dynamic section. We fill in the
3466 values later, in elf_x86_64_finish_dynamic_sections, but we
3467 must add the entries now so that we get the correct size for
3468 the .dynamic section. The DT_DEBUG entry is filled in by the
3469 dynamic linker and used by the debugger. */
3470 #define add_dynamic_entry(TAG, VAL) \
3471 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3473 if (info->executable)
3475 if (!add_dynamic_entry (DT_DEBUG, 0))
3479 if (htab->elf.splt->size != 0)
3481 /* DT_PLTGOT is used by prelink even if there is no PLT
3483 if (!add_dynamic_entry (DT_PLTGOT, 0))
3486 if (htab->elf.srelplt->size != 0)
3488 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3489 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3490 || !add_dynamic_entry (DT_JMPREL, 0))
3494 if (htab->tlsdesc_plt
3495 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3496 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3502 if (!add_dynamic_entry (DT_RELA, 0)
3503 || !add_dynamic_entry (DT_RELASZ, 0)
3504 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3507 /* If any dynamic relocs apply to a read-only section,
3508 then we need a DT_TEXTREL entry. */
3509 if ((info->flags & DF_TEXTREL) == 0)
3510 elf_link_hash_traverse (&htab->elf,
3511 elf_x86_64_readonly_dynrelocs,
3514 if ((info->flags & DF_TEXTREL) != 0)
3516 if (!add_dynamic_entry (DT_TEXTREL, 0))
3521 #undef add_dynamic_entry
3527 elf_x86_64_always_size_sections (bfd *output_bfd,
3528 struct bfd_link_info *info)
3530 asection *tls_sec = elf_hash_table (info)->tls_sec;
3534 struct elf_link_hash_entry *tlsbase;
3536 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3537 "_TLS_MODULE_BASE_",
3538 FALSE, FALSE, FALSE);
3540 if (tlsbase && tlsbase->type == STT_TLS)
3542 struct elf_x86_64_link_hash_table *htab;
3543 struct bfd_link_hash_entry *bh = NULL;
3544 const struct elf_backend_data *bed
3545 = get_elf_backend_data (output_bfd);
3547 htab = elf_x86_64_hash_table (info);
3551 if (!(_bfd_generic_link_add_one_symbol
3552 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3553 tls_sec, 0, NULL, FALSE,
3554 bed->collect, &bh)))
3557 htab->tls_module_base = bh;
3559 tlsbase = (struct elf_link_hash_entry *)bh;
3560 tlsbase->def_regular = 1;
3561 tlsbase->other = STV_HIDDEN;
3562 tlsbase->root.linker_def = 1;
3563 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3570 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3571 executables. Rather than setting it to the beginning of the TLS
3572 section, we have to set it to the end. This function may be called
3573 multiple times, it is idempotent. */
3576 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3578 struct elf_x86_64_link_hash_table *htab;
3579 struct bfd_link_hash_entry *base;
3581 if (!info->executable)
3584 htab = elf_x86_64_hash_table (info);
3588 base = htab->tls_module_base;
3592 base->u.def.value = htab->elf.tls_size;
3595 /* Return the base VMA address which should be subtracted from real addresses
3596 when resolving @dtpoff relocation.
3597 This is PT_TLS segment p_vaddr. */
3600 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3602 /* If tls_sec is NULL, we should have signalled an error already. */
3603 if (elf_hash_table (info)->tls_sec == NULL)
3605 return elf_hash_table (info)->tls_sec->vma;
3608 /* Return the relocation value for @tpoff relocation
3609 if STT_TLS virtual address is ADDRESS. */
3612 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3614 struct elf_link_hash_table *htab = elf_hash_table (info);
3615 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3616 bfd_vma static_tls_size;
3618 /* If tls_segment is NULL, we should have signalled an error already. */
3619 if (htab->tls_sec == NULL)
3622 /* Consider special static TLS alignment requirements. */
3623 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3624 return address - static_tls_size - htab->tls_sec->vma;
3627 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3631 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3633 /* Opcode Instruction
3636 0x0f 0x8x conditional jump */
3638 && (contents [offset - 1] == 0xe8
3639 || contents [offset - 1] == 0xe9))
3641 && contents [offset - 2] == 0x0f
3642 && (contents [offset - 1] & 0xf0) == 0x80));
3645 /* Relocate an x86_64 ELF section. */
3648 elf_x86_64_relocate_section (bfd *output_bfd,
3649 struct bfd_link_info *info,
3651 asection *input_section,
3653 Elf_Internal_Rela *relocs,
3654 Elf_Internal_Sym *local_syms,
3655 asection **local_sections)
3657 struct elf_x86_64_link_hash_table *htab;
3658 Elf_Internal_Shdr *symtab_hdr;
3659 struct elf_link_hash_entry **sym_hashes;
3660 bfd_vma *local_got_offsets;
3661 bfd_vma *local_tlsdesc_gotents;
3662 Elf_Internal_Rela *rel;
3663 Elf_Internal_Rela *relend;
3664 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3666 BFD_ASSERT (is_x86_64_elf (input_bfd));
3668 htab = elf_x86_64_hash_table (info);
3671 symtab_hdr = &elf_symtab_hdr (input_bfd);
3672 sym_hashes = elf_sym_hashes (input_bfd);
3673 local_got_offsets = elf_local_got_offsets (input_bfd);
3674 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3676 elf_x86_64_set_tls_module_base (info);
3679 relend = relocs + input_section->reloc_count;
3680 for (; rel < relend; rel++)
3682 unsigned int r_type;
3683 reloc_howto_type *howto;
3684 unsigned long r_symndx;
3685 struct elf_link_hash_entry *h;
3686 struct elf_x86_64_link_hash_entry *eh;
3687 Elf_Internal_Sym *sym;
3689 bfd_vma off, offplt, plt_offset;
3691 bfd_boolean unresolved_reloc;
3692 bfd_reloc_status_type r;
3694 asection *base_got, *resolved_plt;
3697 r_type = ELF32_R_TYPE (rel->r_info);
3698 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3699 || r_type == (int) R_X86_64_GNU_VTENTRY)
3702 if (r_type >= (int) R_X86_64_standard)
3704 (*_bfd_error_handler)
3705 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3706 input_bfd, input_section, r_type);
3707 bfd_set_error (bfd_error_bad_value);
3711 if (r_type != (int) R_X86_64_32
3712 || ABI_64_P (output_bfd))
3713 howto = x86_64_elf_howto_table + r_type;
3715 howto = (x86_64_elf_howto_table
3716 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3717 r_symndx = htab->r_sym (rel->r_info);
3721 unresolved_reloc = FALSE;
3722 if (r_symndx < symtab_hdr->sh_info)
3724 sym = local_syms + r_symndx;
3725 sec = local_sections[r_symndx];
3727 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3729 st_size = sym->st_size;
3731 /* Relocate against local STT_GNU_IFUNC symbol. */
3732 if (!info->relocatable
3733 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3735 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3740 /* Set STT_GNU_IFUNC symbol value. */
3741 h->root.u.def.value = sym->st_value;
3742 h->root.u.def.section = sec;
3747 bfd_boolean warned ATTRIBUTE_UNUSED;
3748 bfd_boolean ignored ATTRIBUTE_UNUSED;
3750 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3751 r_symndx, symtab_hdr, sym_hashes,
3753 unresolved_reloc, warned, ignored);
3757 if (sec != NULL && discarded_section (sec))
3758 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3759 rel, 1, relend, howto, 0, contents);
3761 if (info->relocatable)
3764 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3766 if (r_type == R_X86_64_64)
3768 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3769 zero-extend it to 64bit if addend is zero. */
3770 r_type = R_X86_64_32;
3771 memset (contents + rel->r_offset + 4, 0, 4);
3773 else if (r_type == R_X86_64_SIZE64)
3775 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3776 zero-extend it to 64bit if addend is zero. */
3777 r_type = R_X86_64_SIZE32;
3778 memset (contents + rel->r_offset + 4, 0, 4);
3782 eh = (struct elf_x86_64_link_hash_entry *) h;
3784 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3785 it here if it is defined in a non-shared object. */
3787 && h->type == STT_GNU_IFUNC
3793 if ((input_section->flags & SEC_ALLOC) == 0)
3795 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3796 sections because such sections are not SEC_ALLOC and
3797 thus ld.so will not process them. */
3798 if ((input_section->flags & SEC_DEBUGGING) != 0)
3802 else if (h->plt.offset == (bfd_vma) -1)
3805 /* STT_GNU_IFUNC symbol must go through PLT. */
3806 if (htab->elf.splt != NULL)
3808 if (htab->plt_bnd != NULL)
3810 resolved_plt = htab->plt_bnd;
3811 plt_offset = eh->plt_bnd.offset;
3815 resolved_plt = htab->elf.splt;
3816 plt_offset = h->plt.offset;
3821 resolved_plt = htab->elf.iplt;
3822 plt_offset = h->plt.offset;
3825 relocation = (resolved_plt->output_section->vma
3826 + resolved_plt->output_offset + plt_offset);
3831 if (h->root.root.string)
3832 name = h->root.root.string;
3834 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3836 (*_bfd_error_handler)
3837 (_("%B: relocation %s against STT_GNU_IFUNC "
3838 "symbol `%s' isn't handled by %s"), input_bfd,
3839 x86_64_elf_howto_table[r_type].name,
3840 name, __FUNCTION__);
3841 bfd_set_error (bfd_error_bad_value);
3850 if (ABI_64_P (output_bfd))
3854 if (rel->r_addend != 0)
3856 if (h->root.root.string)
3857 name = h->root.root.string;
3859 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3861 (*_bfd_error_handler)
3862 (_("%B: relocation %s against STT_GNU_IFUNC "
3863 "symbol `%s' has non-zero addend: %d"),
3864 input_bfd, x86_64_elf_howto_table[r_type].name,
3865 name, rel->r_addend);
3866 bfd_set_error (bfd_error_bad_value);
3870 /* Generate dynamic relcoation only when there is a
3871 non-GOT reference in a shared object. */
3872 if (info->shared && h->non_got_ref)
3874 Elf_Internal_Rela outrel;
3877 /* Need a dynamic relocation to get the real function
3879 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3883 if (outrel.r_offset == (bfd_vma) -1
3884 || outrel.r_offset == (bfd_vma) -2)
3887 outrel.r_offset += (input_section->output_section->vma
3888 + input_section->output_offset);
3890 if (h->dynindx == -1
3892 || info->executable)
3894 /* This symbol is resolved locally. */
3895 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3896 outrel.r_addend = (h->root.u.def.value
3897 + h->root.u.def.section->output_section->vma
3898 + h->root.u.def.section->output_offset);
3902 outrel.r_info = htab->r_info (h->dynindx, r_type);
3903 outrel.r_addend = 0;
3906 sreloc = htab->elf.irelifunc;
3907 elf_append_rela (output_bfd, sreloc, &outrel);
3909 /* If this reloc is against an external symbol, we
3910 do not want to fiddle with the addend. Otherwise,
3911 we need to include the symbol value so that it
3912 becomes an addend for the dynamic reloc. For an
3913 internal symbol, we have updated addend. */
3918 case R_X86_64_PC32_BND:
3920 case R_X86_64_PLT32:
3921 case R_X86_64_PLT32_BND:
3924 case R_X86_64_GOTPCREL:
3925 case R_X86_64_GOTPCREL64:
3926 base_got = htab->elf.sgot;
3927 off = h->got.offset;
3929 if (base_got == NULL)
3932 if (off == (bfd_vma) -1)
3934 /* We can't use h->got.offset here to save state, or
3935 even just remember the offset, as finish_dynamic_symbol
3936 would use that as offset into .got. */
3938 if (htab->elf.splt != NULL)
3940 plt_index = h->plt.offset / plt_entry_size - 1;
3941 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3942 base_got = htab->elf.sgotplt;
3946 plt_index = h->plt.offset / plt_entry_size;
3947 off = plt_index * GOT_ENTRY_SIZE;
3948 base_got = htab->elf.igotplt;
3951 if (h->dynindx == -1
3955 /* This references the local defitionion. We must
3956 initialize this entry in the global offset table.
3957 Since the offset must always be a multiple of 8,
3958 we use the least significant bit to record
3959 whether we have initialized it already.
3961 When doing a dynamic link, we create a .rela.got
3962 relocation entry to initialize the value. This
3963 is done in the finish_dynamic_symbol routine. */
3968 bfd_put_64 (output_bfd, relocation,
3969 base_got->contents + off);
3970 /* Note that this is harmless for the GOTPLT64
3971 case, as -1 | 1 still is -1. */
3977 relocation = (base_got->output_section->vma
3978 + base_got->output_offset + off);
3984 /* When generating a shared object, the relocations handled here are
3985 copied into the output file to be resolved at run time. */
3988 case R_X86_64_GOT32:
3989 case R_X86_64_GOT64:
3990 /* Relocation is to the entry for this symbol in the global
3992 case R_X86_64_GOTPCREL:
3993 case R_X86_64_GOTPCREL64:
3994 /* Use global offset table entry as symbol value. */
3995 case R_X86_64_GOTPLT64:
3996 /* This is obsolete and treated the the same as GOT64. */
3997 base_got = htab->elf.sgot;
3999 if (htab->elf.sgot == NULL)
4006 off = h->got.offset;
4008 && h->plt.offset != (bfd_vma)-1
4009 && off == (bfd_vma)-1)
4011 /* We can't use h->got.offset here to save
4012 state, or even just remember the offset, as
4013 finish_dynamic_symbol would use that as offset into
4015 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
4016 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4017 base_got = htab->elf.sgotplt;
4020 dyn = htab->elf.dynamic_sections_created;
4022 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
4024 && SYMBOL_REFERENCES_LOCAL (info, h))
4025 || (ELF_ST_VISIBILITY (h->other)
4026 && h->root.type == bfd_link_hash_undefweak))
4028 /* This is actually a static link, or it is a -Bsymbolic
4029 link and the symbol is defined locally, or the symbol
4030 was forced to be local because of a version file. We
4031 must initialize this entry in the global offset table.
4032 Since the offset must always be a multiple of 8, we
4033 use the least significant bit to record whether we
4034 have initialized it already.
4036 When doing a dynamic link, we create a .rela.got
4037 relocation entry to initialize the value. This is
4038 done in the finish_dynamic_symbol routine. */
4043 bfd_put_64 (output_bfd, relocation,
4044 base_got->contents + off);
4045 /* Note that this is harmless for the GOTPLT64 case,
4046 as -1 | 1 still is -1. */
4051 unresolved_reloc = FALSE;
4055 if (local_got_offsets == NULL)
4058 off = local_got_offsets[r_symndx];
4060 /* The offset must always be a multiple of 8. We use
4061 the least significant bit to record whether we have
4062 already generated the necessary reloc. */
4067 bfd_put_64 (output_bfd, relocation,
4068 base_got->contents + off);
4073 Elf_Internal_Rela outrel;
4075 /* We need to generate a R_X86_64_RELATIVE reloc
4076 for the dynamic linker. */
4077 s = htab->elf.srelgot;
4081 outrel.r_offset = (base_got->output_section->vma
4082 + base_got->output_offset
4084 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4085 outrel.r_addend = relocation;
4086 elf_append_rela (output_bfd, s, &outrel);
4089 local_got_offsets[r_symndx] |= 1;
4093 if (off >= (bfd_vma) -2)
4096 relocation = base_got->output_section->vma
4097 + base_got->output_offset + off;
4098 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
4099 relocation -= htab->elf.sgotplt->output_section->vma
4100 - htab->elf.sgotplt->output_offset;
4104 case R_X86_64_GOTOFF64:
4105 /* Relocation is relative to the start of the global offset
4108 /* Check to make sure it isn't a protected function or data
4109 symbol for shared library since it may not be local when
4110 used as function address or with copy relocation. We also
4111 need to make sure that a symbol is referenced locally. */
4112 if (info->shared && h)
4114 if (!h->def_regular)
4118 switch (ELF_ST_VISIBILITY (h->other))
4121 v = _("hidden symbol");
4124 v = _("internal symbol");
4127 v = _("protected symbol");
4134 (*_bfd_error_handler)
4135 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4136 input_bfd, v, h->root.root.string);
4137 bfd_set_error (bfd_error_bad_value);
4140 else if (!info->executable
4141 && !SYMBOL_REFERENCES_LOCAL (info, h)
4142 && (h->type == STT_FUNC
4143 || h->type == STT_OBJECT)
4144 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4146 (*_bfd_error_handler)
4147 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4149 h->type == STT_FUNC ? "function" : "data",
4150 h->root.root.string);
4151 bfd_set_error (bfd_error_bad_value);
4156 /* Note that sgot is not involved in this
4157 calculation. We always want the start of .got.plt. If we
4158 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4159 permitted by the ABI, we might have to change this
4161 relocation -= htab->elf.sgotplt->output_section->vma
4162 + htab->elf.sgotplt->output_offset;
4165 case R_X86_64_GOTPC32:
4166 case R_X86_64_GOTPC64:
4167 /* Use global offset table as symbol value. */
4168 relocation = htab->elf.sgotplt->output_section->vma
4169 + htab->elf.sgotplt->output_offset;
4170 unresolved_reloc = FALSE;
4173 case R_X86_64_PLTOFF64:
4174 /* Relocation is PLT entry relative to GOT. For local
4175 symbols it's the symbol itself relative to GOT. */
4177 /* See PLT32 handling. */
4178 && h->plt.offset != (bfd_vma) -1
4179 && htab->elf.splt != NULL)
4181 if (htab->plt_bnd != NULL)
4183 resolved_plt = htab->plt_bnd;
4184 plt_offset = eh->plt_bnd.offset;
4188 resolved_plt = htab->elf.splt;
4189 plt_offset = h->plt.offset;
4192 relocation = (resolved_plt->output_section->vma
4193 + resolved_plt->output_offset
4195 unresolved_reloc = FALSE;
4198 relocation -= htab->elf.sgotplt->output_section->vma
4199 + htab->elf.sgotplt->output_offset;
4202 case R_X86_64_PLT32:
4203 case R_X86_64_PLT32_BND:
4204 /* Relocation is to the entry for this symbol in the
4205 procedure linkage table. */
4207 /* Resolve a PLT32 reloc against a local symbol directly,
4208 without using the procedure linkage table. */
4212 if ((h->plt.offset == (bfd_vma) -1
4213 && eh->plt_got.offset == (bfd_vma) -1)
4214 || htab->elf.splt == NULL)
4216 /* We didn't make a PLT entry for this symbol. This
4217 happens when statically linking PIC code, or when
4218 using -Bsymbolic. */
4222 if (h->plt.offset != (bfd_vma) -1)
4224 if (htab->plt_bnd != NULL)
4226 resolved_plt = htab->plt_bnd;
4227 plt_offset = eh->plt_bnd.offset;
4231 resolved_plt = htab->elf.splt;
4232 plt_offset = h->plt.offset;
4237 /* Use the GOT PLT. */
4238 resolved_plt = htab->plt_got;
4239 plt_offset = eh->plt_got.offset;
4242 relocation = (resolved_plt->output_section->vma
4243 + resolved_plt->output_offset
4245 unresolved_reloc = FALSE;
4248 case R_X86_64_SIZE32:
4249 case R_X86_64_SIZE64:
4250 /* Set to symbol size. */
4251 relocation = st_size;
4257 case R_X86_64_PC32_BND:
4258 /* Don't complain about -fPIC if the symbol is undefined when
4259 building executable. */
4261 && (input_section->flags & SEC_ALLOC) != 0
4262 && (input_section->flags & SEC_READONLY) != 0
4264 && !(info->executable
4265 && h->root.type == bfd_link_hash_undefined))
4267 bfd_boolean fail = FALSE;
4269 = ((r_type == R_X86_64_PC32
4270 || r_type == R_X86_64_PC32_BND)
4271 && is_32bit_relative_branch (contents, rel->r_offset));
4273 if (SYMBOL_REFERENCES_LOCAL (info, h))
4275 /* Symbol is referenced locally. Make sure it is
4276 defined locally or for a branch. */
4277 fail = !h->def_regular && !branch;
4279 else if (!(info->executable
4280 && (h->needs_copy || eh->needs_copy)))
4282 /* Symbol doesn't need copy reloc and isn't referenced
4283 locally. We only allow branch to symbol with
4284 non-default visibility. */
4286 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4293 const char *pic = "";
4295 switch (ELF_ST_VISIBILITY (h->other))
4298 v = _("hidden symbol");
4301 v = _("internal symbol");
4304 v = _("protected symbol");
4308 pic = _("; recompile with -fPIC");
4313 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4315 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4317 (*_bfd_error_handler) (fmt, input_bfd,
4318 x86_64_elf_howto_table[r_type].name,
4319 v, h->root.root.string, pic);
4320 bfd_set_error (bfd_error_bad_value);
4331 /* FIXME: The ABI says the linker should make sure the value is
4332 the same when it's zeroextended to 64 bit. */
4335 if ((input_section->flags & SEC_ALLOC) == 0)
4338 /* Don't copy a pc-relative relocation into the output file
4339 if the symbol needs copy reloc or the symbol is undefined
4340 when building executable. */
4342 && !(info->executable
4346 || h->root.type == bfd_link_hash_undefined)
4347 && IS_X86_64_PCREL_TYPE (r_type))
4349 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4350 || h->root.type != bfd_link_hash_undefweak)
4351 && ((! IS_X86_64_PCREL_TYPE (r_type)
4352 && r_type != R_X86_64_SIZE32
4353 && r_type != R_X86_64_SIZE64)
4354 || ! SYMBOL_CALLS_LOCAL (info, h)))
4355 || (ELIMINATE_COPY_RELOCS
4362 || h->root.type == bfd_link_hash_undefweak
4363 || h->root.type == bfd_link_hash_undefined)))
4365 Elf_Internal_Rela outrel;
4366 bfd_boolean skip, relocate;
4369 /* When generating a shared object, these relocations
4370 are copied into the output file to be resolved at run
4376 _bfd_elf_section_offset (output_bfd, info, input_section,
4378 if (outrel.r_offset == (bfd_vma) -1)
4380 else if (outrel.r_offset == (bfd_vma) -2)
4381 skip = TRUE, relocate = TRUE;
4383 outrel.r_offset += (input_section->output_section->vma
4384 + input_section->output_offset);
4387 memset (&outrel, 0, sizeof outrel);
4389 /* h->dynindx may be -1 if this symbol was marked to
4393 && (IS_X86_64_PCREL_TYPE (r_type)
4395 || ! SYMBOLIC_BIND (info, h)
4396 || ! h->def_regular))
4398 outrel.r_info = htab->r_info (h->dynindx, r_type);
4399 outrel.r_addend = rel->r_addend;
4403 /* This symbol is local, or marked to become local. */
4404 if (r_type == htab->pointer_r_type)
4407 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4408 outrel.r_addend = relocation + rel->r_addend;
4410 else if (r_type == R_X86_64_64
4411 && !ABI_64_P (output_bfd))
4414 outrel.r_info = htab->r_info (0,
4415 R_X86_64_RELATIVE64);
4416 outrel.r_addend = relocation + rel->r_addend;
4417 /* Check addend overflow. */
4418 if ((outrel.r_addend & 0x80000000)
4419 != (rel->r_addend & 0x80000000))
4422 int addend = rel->r_addend;
4423 if (h && h->root.root.string)
4424 name = h->root.root.string;
4426 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4429 (*_bfd_error_handler)
4430 (_("%B: addend -0x%x in relocation %s against "
4431 "symbol `%s' at 0x%lx in section `%A' is "
4433 input_bfd, input_section, addend,
4434 x86_64_elf_howto_table[r_type].name,
4435 name, (unsigned long) rel->r_offset);
4437 (*_bfd_error_handler)
4438 (_("%B: addend 0x%x in relocation %s against "
4439 "symbol `%s' at 0x%lx in section `%A' is "
4441 input_bfd, input_section, addend,
4442 x86_64_elf_howto_table[r_type].name,
4443 name, (unsigned long) rel->r_offset);
4444 bfd_set_error (bfd_error_bad_value);
4452 if (bfd_is_abs_section (sec))
4454 else if (sec == NULL || sec->owner == NULL)
4456 bfd_set_error (bfd_error_bad_value);
4463 /* We are turning this relocation into one
4464 against a section symbol. It would be
4465 proper to subtract the symbol's value,
4466 osec->vma, from the emitted reloc addend,
4467 but ld.so expects buggy relocs. */
4468 osec = sec->output_section;
4469 sindx = elf_section_data (osec)->dynindx;
4472 asection *oi = htab->elf.text_index_section;
4473 sindx = elf_section_data (oi)->dynindx;
4475 BFD_ASSERT (sindx != 0);
4478 outrel.r_info = htab->r_info (sindx, r_type);
4479 outrel.r_addend = relocation + rel->r_addend;
4483 sreloc = elf_section_data (input_section)->sreloc;
4485 if (sreloc == NULL || sreloc->contents == NULL)
4487 r = bfd_reloc_notsupported;
4488 goto check_relocation_error;
4491 elf_append_rela (output_bfd, sreloc, &outrel);
4493 /* If this reloc is against an external symbol, we do
4494 not want to fiddle with the addend. Otherwise, we
4495 need to include the symbol value so that it becomes
4496 an addend for the dynamic reloc. */
4503 case R_X86_64_TLSGD:
4504 case R_X86_64_GOTPC32_TLSDESC:
4505 case R_X86_64_TLSDESC_CALL:
4506 case R_X86_64_GOTTPOFF:
4507 tls_type = GOT_UNKNOWN;
4508 if (h == NULL && local_got_offsets)
4509 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4511 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4513 if (! elf_x86_64_tls_transition (info, input_bfd,
4514 input_section, contents,
4515 symtab_hdr, sym_hashes,
4516 &r_type, tls_type, rel,
4517 relend, h, r_symndx))
4520 if (r_type == R_X86_64_TPOFF32)
4522 bfd_vma roff = rel->r_offset;
4524 BFD_ASSERT (! unresolved_reloc);
4526 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4528 /* GD->LE transition. For 64bit, change
4529 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4530 .word 0x6666; rex64; call __tls_get_addr
4533 leaq foo@tpoff(%rax), %rax
4535 leaq foo@tlsgd(%rip), %rdi
4536 .word 0x6666; rex64; call __tls_get_addr
4539 leaq foo@tpoff(%rax), %rax
4540 For largepic, change:
4541 leaq foo@tlsgd(%rip), %rdi
4542 movabsq $__tls_get_addr@pltoff, %rax
4547 leaq foo@tpoff(%rax), %rax
4548 nopw 0x0(%rax,%rax,1) */
4550 if (ABI_64_P (output_bfd)
4551 && contents[roff + 5] == (bfd_byte) '\xb8')
4553 memcpy (contents + roff - 3,
4554 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4555 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4558 else if (ABI_64_P (output_bfd))
4559 memcpy (contents + roff - 4,
4560 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4563 memcpy (contents + roff - 3,
4564 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4566 bfd_put_32 (output_bfd,
4567 elf_x86_64_tpoff (info, relocation),
4568 contents + roff + 8 + largepic);
4569 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4573 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4575 /* GDesc -> LE transition.
4576 It's originally something like:
4577 leaq x@tlsdesc(%rip), %rax
4580 movl $x@tpoff, %rax. */
4582 unsigned int val, type;
4584 type = bfd_get_8 (input_bfd, contents + roff - 3);
4585 val = bfd_get_8 (input_bfd, contents + roff - 1);
4586 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4587 contents + roff - 3);
4588 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4589 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4590 contents + roff - 1);
4591 bfd_put_32 (output_bfd,
4592 elf_x86_64_tpoff (info, relocation),
4596 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4598 /* GDesc -> LE transition.
4603 bfd_put_8 (output_bfd, 0x66, contents + roff);
4604 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4607 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4609 /* IE->LE transition:
4610 For 64bit, originally it can be one of:
4611 movq foo@gottpoff(%rip), %reg
4612 addq foo@gottpoff(%rip), %reg
4615 leaq foo(%reg), %reg
4617 For 32bit, originally it can be one of:
4618 movq foo@gottpoff(%rip), %reg
4619 addl foo@gottpoff(%rip), %reg
4622 leal foo(%reg), %reg
4625 unsigned int val, type, reg;
4628 val = bfd_get_8 (input_bfd, contents + roff - 3);
4631 type = bfd_get_8 (input_bfd, contents + roff - 2);
4632 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4638 bfd_put_8 (output_bfd, 0x49,
4639 contents + roff - 3);
4640 else if (!ABI_64_P (output_bfd) && val == 0x44)
4641 bfd_put_8 (output_bfd, 0x41,
4642 contents + roff - 3);
4643 bfd_put_8 (output_bfd, 0xc7,
4644 contents + roff - 2);
4645 bfd_put_8 (output_bfd, 0xc0 | reg,
4646 contents + roff - 1);
4650 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4653 bfd_put_8 (output_bfd, 0x49,
4654 contents + roff - 3);
4655 else if (!ABI_64_P (output_bfd) && val == 0x44)
4656 bfd_put_8 (output_bfd, 0x41,
4657 contents + roff - 3);
4658 bfd_put_8 (output_bfd, 0x81,
4659 contents + roff - 2);
4660 bfd_put_8 (output_bfd, 0xc0 | reg,
4661 contents + roff - 1);
4665 /* addq/addl -> leaq/leal */
4667 bfd_put_8 (output_bfd, 0x4d,
4668 contents + roff - 3);
4669 else if (!ABI_64_P (output_bfd) && val == 0x44)
4670 bfd_put_8 (output_bfd, 0x45,
4671 contents + roff - 3);
4672 bfd_put_8 (output_bfd, 0x8d,
4673 contents + roff - 2);
4674 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4675 contents + roff - 1);
4677 bfd_put_32 (output_bfd,
4678 elf_x86_64_tpoff (info, relocation),
4686 if (htab->elf.sgot == NULL)
4691 off = h->got.offset;
4692 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4696 if (local_got_offsets == NULL)
4699 off = local_got_offsets[r_symndx];
4700 offplt = local_tlsdesc_gotents[r_symndx];
4707 Elf_Internal_Rela outrel;
4711 if (htab->elf.srelgot == NULL)
4714 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4716 if (GOT_TLS_GDESC_P (tls_type))
4718 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4719 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4720 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4721 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4722 + htab->elf.sgotplt->output_offset
4724 + htab->sgotplt_jump_table_size);
4725 sreloc = htab->elf.srelplt;
4727 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4729 outrel.r_addend = 0;
4730 elf_append_rela (output_bfd, sreloc, &outrel);
4733 sreloc = htab->elf.srelgot;
4735 outrel.r_offset = (htab->elf.sgot->output_section->vma
4736 + htab->elf.sgot->output_offset + off);
4738 if (GOT_TLS_GD_P (tls_type))
4739 dr_type = R_X86_64_DTPMOD64;
4740 else if (GOT_TLS_GDESC_P (tls_type))
4743 dr_type = R_X86_64_TPOFF64;
4745 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4746 outrel.r_addend = 0;
4747 if ((dr_type == R_X86_64_TPOFF64
4748 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4749 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4750 outrel.r_info = htab->r_info (indx, dr_type);
4752 elf_append_rela (output_bfd, sreloc, &outrel);
4754 if (GOT_TLS_GD_P (tls_type))
4758 BFD_ASSERT (! unresolved_reloc);
4759 bfd_put_64 (output_bfd,
4760 relocation - elf_x86_64_dtpoff_base (info),
4761 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4765 bfd_put_64 (output_bfd, 0,
4766 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4767 outrel.r_info = htab->r_info (indx,
4769 outrel.r_offset += GOT_ENTRY_SIZE;
4770 elf_append_rela (output_bfd, sreloc,
4779 local_got_offsets[r_symndx] |= 1;
4782 if (off >= (bfd_vma) -2
4783 && ! GOT_TLS_GDESC_P (tls_type))
4785 if (r_type == ELF32_R_TYPE (rel->r_info))
4787 if (r_type == R_X86_64_GOTPC32_TLSDESC
4788 || r_type == R_X86_64_TLSDESC_CALL)
4789 relocation = htab->elf.sgotplt->output_section->vma
4790 + htab->elf.sgotplt->output_offset
4791 + offplt + htab->sgotplt_jump_table_size;
4793 relocation = htab->elf.sgot->output_section->vma
4794 + htab->elf.sgot->output_offset + off;
4795 unresolved_reloc = FALSE;
4799 bfd_vma roff = rel->r_offset;
4801 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4803 /* GD->IE transition. For 64bit, change
4804 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4805 .word 0x6666; rex64; call __tls_get_addr@plt
4808 addq foo@gottpoff(%rip), %rax
4810 leaq foo@tlsgd(%rip), %rdi
4811 .word 0x6666; rex64; call __tls_get_addr@plt
4814 addq foo@gottpoff(%rip), %rax
4815 For largepic, change:
4816 leaq foo@tlsgd(%rip), %rdi
4817 movabsq $__tls_get_addr@pltoff, %rax
4822 addq foo@gottpoff(%rax), %rax
4823 nopw 0x0(%rax,%rax,1) */
4825 if (ABI_64_P (output_bfd)
4826 && contents[roff + 5] == (bfd_byte) '\xb8')
4828 memcpy (contents + roff - 3,
4829 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4830 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4833 else if (ABI_64_P (output_bfd))
4834 memcpy (contents + roff - 4,
4835 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4838 memcpy (contents + roff - 3,
4839 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4842 relocation = (htab->elf.sgot->output_section->vma
4843 + htab->elf.sgot->output_offset + off
4846 - input_section->output_section->vma
4847 - input_section->output_offset
4849 bfd_put_32 (output_bfd, relocation,
4850 contents + roff + 8 + largepic);
4851 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4855 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4857 /* GDesc -> IE transition.
4858 It's originally something like:
4859 leaq x@tlsdesc(%rip), %rax
4862 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4864 /* Now modify the instruction as appropriate. To
4865 turn a leaq into a movq in the form we use it, it
4866 suffices to change the second byte from 0x8d to
4868 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4870 bfd_put_32 (output_bfd,
4871 htab->elf.sgot->output_section->vma
4872 + htab->elf.sgot->output_offset + off
4874 - input_section->output_section->vma
4875 - input_section->output_offset
4880 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4882 /* GDesc -> IE transition.
4889 bfd_put_8 (output_bfd, 0x66, contents + roff);
4890 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4898 case R_X86_64_TLSLD:
4899 if (! elf_x86_64_tls_transition (info, input_bfd,
4900 input_section, contents,
4901 symtab_hdr, sym_hashes,
4902 &r_type, GOT_UNKNOWN,
4903 rel, relend, h, r_symndx))
4906 if (r_type != R_X86_64_TLSLD)
4908 /* LD->LE transition:
4909 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4910 For 64bit, we change it into:
4911 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4912 For 32bit, we change it into:
4913 nopl 0x0(%rax); movl %fs:0, %eax.
4914 For largepic, change:
4915 leaq foo@tlsgd(%rip), %rdi
4916 movabsq $__tls_get_addr@pltoff, %rax
4920 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4923 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4924 if (ABI_64_P (output_bfd)
4925 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
4926 memcpy (contents + rel->r_offset - 3,
4927 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4928 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4929 else if (ABI_64_P (output_bfd))
4930 memcpy (contents + rel->r_offset - 3,
4931 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4933 memcpy (contents + rel->r_offset - 3,
4934 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4935 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4940 if (htab->elf.sgot == NULL)
4943 off = htab->tls_ld_got.offset;
4948 Elf_Internal_Rela outrel;
4950 if (htab->elf.srelgot == NULL)
4953 outrel.r_offset = (htab->elf.sgot->output_section->vma
4954 + htab->elf.sgot->output_offset + off);
4956 bfd_put_64 (output_bfd, 0,
4957 htab->elf.sgot->contents + off);
4958 bfd_put_64 (output_bfd, 0,
4959 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4960 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4961 outrel.r_addend = 0;
4962 elf_append_rela (output_bfd, htab->elf.srelgot,
4964 htab->tls_ld_got.offset |= 1;
4966 relocation = htab->elf.sgot->output_section->vma
4967 + htab->elf.sgot->output_offset + off;
4968 unresolved_reloc = FALSE;
4971 case R_X86_64_DTPOFF32:
4972 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4973 relocation -= elf_x86_64_dtpoff_base (info);
4975 relocation = elf_x86_64_tpoff (info, relocation);
4978 case R_X86_64_TPOFF32:
4979 case R_X86_64_TPOFF64:
4980 BFD_ASSERT (info->executable);
4981 relocation = elf_x86_64_tpoff (info, relocation);
4984 case R_X86_64_DTPOFF64:
4985 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4986 relocation -= elf_x86_64_dtpoff_base (info);
4993 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4994 because such sections are not SEC_ALLOC and thus ld.so will
4995 not process them. */
4996 if (unresolved_reloc
4997 && !((input_section->flags & SEC_DEBUGGING) != 0
4999 && _bfd_elf_section_offset (output_bfd, info, input_section,
5000 rel->r_offset) != (bfd_vma) -1)
5002 (*_bfd_error_handler)
5003 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5006 (long) rel->r_offset,
5008 h->root.root.string);
5013 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5014 contents, rel->r_offset,
5015 relocation, rel->r_addend);
5017 check_relocation_error:
5018 if (r != bfd_reloc_ok)
5023 name = h->root.root.string;
5026 name = bfd_elf_string_from_elf_section (input_bfd,
5027 symtab_hdr->sh_link,
5032 name = bfd_section_name (input_bfd, sec);
5035 if (r == bfd_reloc_overflow)
5037 if (! ((*info->callbacks->reloc_overflow)
5038 (info, (h ? &h->root : NULL), name, howto->name,
5039 (bfd_vma) 0, input_bfd, input_section,
5045 (*_bfd_error_handler)
5046 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5047 input_bfd, input_section,
5048 (long) rel->r_offset, name, (int) r);
5057 /* Finish up dynamic symbol handling. We set the contents of various
5058 dynamic sections here. */
5061 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
5062 struct bfd_link_info *info,
5063 struct elf_link_hash_entry *h,
5064 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
5066 struct elf_x86_64_link_hash_table *htab;
5067 const struct elf_x86_64_backend_data *abed;
5068 bfd_boolean use_plt_bnd;
5069 struct elf_x86_64_link_hash_entry *eh;
5071 htab = elf_x86_64_hash_table (info);
5075 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5076 section only if there is .plt section. */
5077 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
5079 ? &elf_x86_64_bnd_arch_bed
5080 : get_elf_x86_64_backend_data (output_bfd));
5082 eh = (struct elf_x86_64_link_hash_entry *) h;
5084 if (h->plt.offset != (bfd_vma) -1)
5087 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
5088 bfd_vma plt_plt_insn_end, plt_got_insn_size;
5089 Elf_Internal_Rela rela;
5091 asection *plt, *gotplt, *relplt, *resolved_plt;
5092 const struct elf_backend_data *bed;
5093 bfd_vma plt_got_pcrel_offset;
5095 /* When building a static executable, use .iplt, .igot.plt and
5096 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5097 if (htab->elf.splt != NULL)
5099 plt = htab->elf.splt;
5100 gotplt = htab->elf.sgotplt;
5101 relplt = htab->elf.srelplt;
5105 plt = htab->elf.iplt;
5106 gotplt = htab->elf.igotplt;
5107 relplt = htab->elf.irelplt;
5110 /* This symbol has an entry in the procedure linkage table. Set
5112 if ((h->dynindx == -1
5113 && !((h->forced_local || info->executable)
5115 && h->type == STT_GNU_IFUNC))
5121 /* Get the index in the procedure linkage table which
5122 corresponds to this symbol. This is the index of this symbol
5123 in all the symbols for which we are making plt entries. The
5124 first entry in the procedure linkage table is reserved.
5126 Get the offset into the .got table of the entry that
5127 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5128 bytes. The first three are reserved for the dynamic linker.
5130 For static executables, we don't reserve anything. */
5132 if (plt == htab->elf.splt)
5134 got_offset = h->plt.offset / abed->plt_entry_size - 1;
5135 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5139 got_offset = h->plt.offset / abed->plt_entry_size;
5140 got_offset = got_offset * GOT_ENTRY_SIZE;
5143 plt_plt_insn_end = abed->plt_plt_insn_end;
5144 plt_plt_offset = abed->plt_plt_offset;
5145 plt_got_insn_size = abed->plt_got_insn_size;
5146 plt_got_offset = abed->plt_got_offset;
5149 /* Use the second PLT with BND relocations. */
5150 const bfd_byte *plt_entry, *plt2_entry;
5152 if (eh->has_bnd_reloc)
5154 plt_entry = elf_x86_64_bnd_plt_entry;
5155 plt2_entry = elf_x86_64_bnd_plt2_entry;
5159 plt_entry = elf_x86_64_legacy_plt_entry;
5160 plt2_entry = elf_x86_64_legacy_plt2_entry;
5162 /* Subtract 1 since there is no BND prefix. */
5163 plt_plt_insn_end -= 1;
5164 plt_plt_offset -= 1;
5165 plt_got_insn_size -= 1;
5166 plt_got_offset -= 1;
5169 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
5170 == sizeof (elf_x86_64_legacy_plt_entry));
5172 /* Fill in the entry in the procedure linkage table. */
5173 memcpy (plt->contents + h->plt.offset,
5174 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
5175 /* Fill in the entry in the second PLT. */
5176 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
5177 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5179 resolved_plt = htab->plt_bnd;
5180 plt_offset = eh->plt_bnd.offset;
5184 /* Fill in the entry in the procedure linkage table. */
5185 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
5186 abed->plt_entry_size);
5189 plt_offset = h->plt.offset;
5192 /* Insert the relocation positions of the plt section. */
5194 /* Put offset the PC-relative instruction referring to the GOT entry,
5195 subtracting the size of that instruction. */
5196 plt_got_pcrel_offset = (gotplt->output_section->vma
5197 + gotplt->output_offset
5199 - resolved_plt->output_section->vma
5200 - resolved_plt->output_offset
5202 - plt_got_insn_size);
5204 /* Check PC-relative offset overflow in PLT entry. */
5205 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5206 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5207 output_bfd, h->root.root.string);
5209 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5210 resolved_plt->contents + plt_offset + plt_got_offset);
5212 /* Fill in the entry in the global offset table, initially this
5213 points to the second part of the PLT entry. */
5214 bfd_put_64 (output_bfd, (plt->output_section->vma
5215 + plt->output_offset
5216 + h->plt.offset + abed->plt_lazy_offset),
5217 gotplt->contents + got_offset);
5219 /* Fill in the entry in the .rela.plt section. */
5220 rela.r_offset = (gotplt->output_section->vma
5221 + gotplt->output_offset
5223 if (h->dynindx == -1
5224 || ((info->executable
5225 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5227 && h->type == STT_GNU_IFUNC))
5229 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5230 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5231 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5232 rela.r_addend = (h->root.u.def.value
5233 + h->root.u.def.section->output_section->vma
5234 + h->root.u.def.section->output_offset);
5235 /* R_X86_64_IRELATIVE comes last. */
5236 plt_index = htab->next_irelative_index--;
5240 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5242 plt_index = htab->next_jump_slot_index++;
5245 /* Don't fill PLT entry for static executables. */
5246 if (plt == htab->elf.splt)
5248 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5250 /* Put relocation index. */
5251 bfd_put_32 (output_bfd, plt_index,
5252 plt->contents + h->plt.offset + abed->plt_reloc_offset);
5254 /* Put offset for jmp .PLT0 and check for overflow. We don't
5255 check relocation index for overflow since branch displacement
5256 will overflow first. */
5257 if (plt0_offset > 0x80000000)
5258 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5259 output_bfd, h->root.root.string);
5260 bfd_put_32 (output_bfd, - plt0_offset,
5261 plt->contents + h->plt.offset + plt_plt_offset);
5264 bed = get_elf_backend_data (output_bfd);
5265 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5266 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5268 else if (eh->plt_got.offset != (bfd_vma) -1)
5270 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
5271 asection *plt, *got;
5272 bfd_boolean got_after_plt;
5273 int32_t got_pcrel_offset;
5274 const bfd_byte *got_plt_entry;
5276 /* Set the entry in the GOT procedure linkage table. */
5277 plt = htab->plt_got;
5278 got = htab->elf.sgot;
5279 got_offset = h->got.offset;
5281 if (got_offset == (bfd_vma) -1
5282 || h->type == STT_GNU_IFUNC
5287 /* Use the second PLT entry template for the GOT PLT since they
5288 are the identical. */
5289 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
5290 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
5291 if (eh->has_bnd_reloc)
5292 got_plt_entry = elf_x86_64_bnd_plt2_entry;
5295 got_plt_entry = elf_x86_64_legacy_plt2_entry;
5297 /* Subtract 1 since there is no BND prefix. */
5298 plt_got_insn_size -= 1;
5299 plt_got_offset -= 1;
5302 /* Fill in the entry in the GOT procedure linkage table. */
5303 plt_offset = eh->plt_got.offset;
5304 memcpy (plt->contents + plt_offset,
5305 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5307 /* Put offset the PC-relative instruction referring to the GOT
5308 entry, subtracting the size of that instruction. */
5309 got_pcrel_offset = (got->output_section->vma
5310 + got->output_offset
5312 - plt->output_section->vma
5313 - plt->output_offset
5315 - plt_got_insn_size);
5317 /* Check PC-relative offset overflow in GOT PLT entry. */
5318 got_after_plt = got->output_section->vma > plt->output_section->vma;
5319 if ((got_after_plt && got_pcrel_offset < 0)
5320 || (!got_after_plt && got_pcrel_offset > 0))
5321 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5322 output_bfd, h->root.root.string);
5324 bfd_put_32 (output_bfd, got_pcrel_offset,
5325 plt->contents + plt_offset + plt_got_offset);
5329 && (h->plt.offset != (bfd_vma) -1
5330 || eh->plt_got.offset != (bfd_vma) -1))
5332 /* Mark the symbol as undefined, rather than as defined in
5333 the .plt section. Leave the value if there were any
5334 relocations where pointer equality matters (this is a clue
5335 for the dynamic linker, to make function pointer
5336 comparisons work between an application and shared
5337 library), otherwise set it to zero. If a function is only
5338 called from a binary, there is no need to slow down
5339 shared libraries because of that. */
5340 sym->st_shndx = SHN_UNDEF;
5341 if (!h->pointer_equality_needed)
5345 if (h->got.offset != (bfd_vma) -1
5346 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
5347 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
5349 Elf_Internal_Rela rela;
5351 /* This symbol has an entry in the global offset table. Set it
5353 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5356 rela.r_offset = (htab->elf.sgot->output_section->vma
5357 + htab->elf.sgot->output_offset
5358 + (h->got.offset &~ (bfd_vma) 1));
5360 /* If this is a static link, or it is a -Bsymbolic link and the
5361 symbol is defined locally or was forced to be local because
5362 of a version file, we just want to emit a RELATIVE reloc.
5363 The entry in the global offset table will already have been
5364 initialized in the relocate_section function. */
5366 && h->type == STT_GNU_IFUNC)
5370 /* Generate R_X86_64_GLOB_DAT. */
5377 if (!h->pointer_equality_needed)
5380 /* For non-shared object, we can't use .got.plt, which
5381 contains the real function addres if we need pointer
5382 equality. We load the GOT entry with the PLT entry. */
5383 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5384 bfd_put_64 (output_bfd, (plt->output_section->vma
5385 + plt->output_offset
5387 htab->elf.sgot->contents + h->got.offset);
5391 else if (info->shared
5392 && SYMBOL_REFERENCES_LOCAL (info, h))
5394 if (!h->def_regular)
5396 BFD_ASSERT((h->got.offset & 1) != 0);
5397 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5398 rela.r_addend = (h->root.u.def.value
5399 + h->root.u.def.section->output_section->vma
5400 + h->root.u.def.section->output_offset);
5404 BFD_ASSERT((h->got.offset & 1) == 0);
5406 bfd_put_64 (output_bfd, (bfd_vma) 0,
5407 htab->elf.sgot->contents + h->got.offset);
5408 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5412 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5417 Elf_Internal_Rela rela;
5419 /* This symbol needs a copy reloc. Set it up. */
5421 if (h->dynindx == -1
5422 || (h->root.type != bfd_link_hash_defined
5423 && h->root.type != bfd_link_hash_defweak)
5424 || htab->srelbss == NULL)
5427 rela.r_offset = (h->root.u.def.value
5428 + h->root.u.def.section->output_section->vma
5429 + h->root.u.def.section->output_offset);
5430 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5432 elf_append_rela (output_bfd, htab->srelbss, &rela);
5438 /* Finish up local dynamic symbol handling. We set the contents of
5439 various dynamic sections here. */
5442 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5444 struct elf_link_hash_entry *h
5445 = (struct elf_link_hash_entry *) *slot;
5446 struct bfd_link_info *info
5447 = (struct bfd_link_info *) inf;
5449 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5453 /* Used to decide how to sort relocs in an optimal manner for the
5454 dynamic linker, before writing them out. */
5456 static enum elf_reloc_type_class
5457 elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
5458 const asection *rel_sec ATTRIBUTE_UNUSED,
5459 const Elf_Internal_Rela *rela)
5461 switch ((int) ELF32_R_TYPE (rela->r_info))
5463 case R_X86_64_RELATIVE:
5464 case R_X86_64_RELATIVE64:
5465 return reloc_class_relative;
5466 case R_X86_64_JUMP_SLOT:
5467 return reloc_class_plt;
5469 return reloc_class_copy;
5471 return reloc_class_normal;
5475 /* Finish up the dynamic sections. */
5478 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5479 struct bfd_link_info *info)
5481 struct elf_x86_64_link_hash_table *htab;
5484 const struct elf_x86_64_backend_data *abed;
5486 htab = elf_x86_64_hash_table (info);
5490 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5491 section only if there is .plt section. */
5492 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5493 ? &elf_x86_64_bnd_arch_bed
5494 : get_elf_x86_64_backend_data (output_bfd));
5496 dynobj = htab->elf.dynobj;
5497 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5499 if (htab->elf.dynamic_sections_created)
5501 bfd_byte *dyncon, *dynconend;
5502 const struct elf_backend_data *bed;
5503 bfd_size_type sizeof_dyn;
5505 if (sdyn == NULL || htab->elf.sgot == NULL)
5508 bed = get_elf_backend_data (dynobj);
5509 sizeof_dyn = bed->s->sizeof_dyn;
5510 dyncon = sdyn->contents;
5511 dynconend = sdyn->contents + sdyn->size;
5512 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5514 Elf_Internal_Dyn dyn;
5517 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5525 s = htab->elf.sgotplt;
5526 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5530 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5534 s = htab->elf.srelplt->output_section;
5535 dyn.d_un.d_val = s->size;
5539 /* The procedure linkage table relocs (DT_JMPREL) should
5540 not be included in the overall relocs (DT_RELA).
5541 Therefore, we override the DT_RELASZ entry here to
5542 make it not include the JMPREL relocs. Since the
5543 linker script arranges for .rela.plt to follow all
5544 other relocation sections, we don't have to worry
5545 about changing the DT_RELA entry. */
5546 if (htab->elf.srelplt != NULL)
5548 s = htab->elf.srelplt->output_section;
5549 dyn.d_un.d_val -= s->size;
5553 case DT_TLSDESC_PLT:
5555 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5556 + htab->tlsdesc_plt;
5559 case DT_TLSDESC_GOT:
5561 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5562 + htab->tlsdesc_got;
5566 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5569 /* Fill in the special first entry in the procedure linkage table. */
5570 if (htab->elf.splt && htab->elf.splt->size > 0)
5572 /* Fill in the first entry in the procedure linkage table. */
5573 memcpy (htab->elf.splt->contents,
5574 abed->plt0_entry, abed->plt_entry_size);
5575 /* Add offset for pushq GOT+8(%rip), since the instruction
5576 uses 6 bytes subtract this value. */
5577 bfd_put_32 (output_bfd,
5578 (htab->elf.sgotplt->output_section->vma
5579 + htab->elf.sgotplt->output_offset
5581 - htab->elf.splt->output_section->vma
5582 - htab->elf.splt->output_offset
5584 htab->elf.splt->contents + abed->plt0_got1_offset);
5585 /* Add offset for the PC-relative instruction accessing GOT+16,
5586 subtracting the offset to the end of that instruction. */
5587 bfd_put_32 (output_bfd,
5588 (htab->elf.sgotplt->output_section->vma
5589 + htab->elf.sgotplt->output_offset
5591 - htab->elf.splt->output_section->vma
5592 - htab->elf.splt->output_offset
5593 - abed->plt0_got2_insn_end),
5594 htab->elf.splt->contents + abed->plt0_got2_offset);
5596 elf_section_data (htab->elf.splt->output_section)
5597 ->this_hdr.sh_entsize = abed->plt_entry_size;
5599 if (htab->tlsdesc_plt)
5601 bfd_put_64 (output_bfd, (bfd_vma) 0,
5602 htab->elf.sgot->contents + htab->tlsdesc_got);
5604 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5605 abed->plt0_entry, abed->plt_entry_size);
5607 /* Add offset for pushq GOT+8(%rip), since the
5608 instruction uses 6 bytes subtract this value. */
5609 bfd_put_32 (output_bfd,
5610 (htab->elf.sgotplt->output_section->vma
5611 + htab->elf.sgotplt->output_offset
5613 - htab->elf.splt->output_section->vma
5614 - htab->elf.splt->output_offset
5617 htab->elf.splt->contents
5618 + htab->tlsdesc_plt + abed->plt0_got1_offset);
5619 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5620 where TGD stands for htab->tlsdesc_got, subtracting the offset
5621 to the end of that instruction. */
5622 bfd_put_32 (output_bfd,
5623 (htab->elf.sgot->output_section->vma
5624 + htab->elf.sgot->output_offset
5626 - htab->elf.splt->output_section->vma
5627 - htab->elf.splt->output_offset
5629 - abed->plt0_got2_insn_end),
5630 htab->elf.splt->contents
5631 + htab->tlsdesc_plt + abed->plt0_got2_offset);
5636 if (htab->plt_bnd != NULL)
5637 elf_section_data (htab->plt_bnd->output_section)
5638 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
5640 if (htab->elf.sgotplt)
5642 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5644 (*_bfd_error_handler)
5645 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5649 /* Fill in the first three entries in the global offset table. */
5650 if (htab->elf.sgotplt->size > 0)
5652 /* Set the first entry in the global offset table to the address of
5653 the dynamic section. */
5655 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5657 bfd_put_64 (output_bfd,
5658 sdyn->output_section->vma + sdyn->output_offset,
5659 htab->elf.sgotplt->contents);
5660 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5661 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5662 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5665 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
5669 /* Adjust .eh_frame for .plt section. */
5670 if (htab->plt_eh_frame != NULL
5671 && htab->plt_eh_frame->contents != NULL)
5673 if (htab->elf.splt != NULL
5674 && htab->elf.splt->size != 0
5675 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5676 && htab->elf.splt->output_section != NULL
5677 && htab->plt_eh_frame->output_section != NULL)
5679 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5680 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5681 + htab->plt_eh_frame->output_offset
5682 + PLT_FDE_START_OFFSET;
5683 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5684 htab->plt_eh_frame->contents
5685 + PLT_FDE_START_OFFSET);
5687 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5689 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5691 htab->plt_eh_frame->contents))
5696 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5697 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5700 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5701 htab_traverse (htab->loc_hash_table,
5702 elf_x86_64_finish_local_dynamic_symbol,
5708 /* Return an array of PLT entry symbol values. */
5711 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5714 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5717 bfd_vma *plt_sym_val;
5719 bfd_byte *plt_contents;
5720 const struct elf_x86_64_backend_data *bed;
5721 Elf_Internal_Shdr *hdr;
5724 /* Get the .plt section contents. PLT passed down may point to the
5725 .plt.bnd section. Make sure that PLT always points to the .plt
5727 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
5732 plt = bfd_get_section_by_name (abfd, ".plt");
5735 bed = &elf_x86_64_bnd_arch_bed;
5738 bed = get_elf_x86_64_backend_data (abfd);
5740 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5741 if (plt_contents == NULL)
5743 if (!bfd_get_section_contents (abfd, (asection *) plt,
5744 plt_contents, 0, plt->size))
5747 free (plt_contents);
5751 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5752 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5755 hdr = &elf_section_data (relplt)->this_hdr;
5756 count = relplt->size / hdr->sh_entsize;
5758 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5759 if (plt_sym_val == NULL)
5762 for (i = 0; i < count; i++)
5763 plt_sym_val[i] = -1;
5765 plt_offset = bed->plt_entry_size;
5766 p = relplt->relocation;
5767 for (i = 0; i < count; i++, p++)
5771 /* Skip unknown relocation. */
5772 if (p->howto == NULL)
5775 if (p->howto->type != R_X86_64_JUMP_SLOT
5776 && p->howto->type != R_X86_64_IRELATIVE)
5779 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5780 + bed->plt_reloc_offset));
5781 if (reloc_index >= count)
5785 /* This is the index in .plt section. */
5786 long plt_index = plt_offset / bed->plt_entry_size;
5787 /* Store VMA + the offset in .plt.bnd section. */
5788 plt_sym_val[reloc_index] =
5790 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
5793 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5794 plt_offset += bed->plt_entry_size;
5796 /* PR binutils/18437: Skip extra relocations in the .rela.plt
5798 if (plt_offset >= plt->size)
5802 free (plt_contents);
5807 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5811 elf_x86_64_get_synthetic_symtab (bfd *abfd,
5818 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5819 as PLT if it exists. */
5820 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
5822 plt = bfd_get_section_by_name (abfd, ".plt");
5823 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5824 dynsymcount, dynsyms, ret,
5826 elf_x86_64_get_plt_sym_val);
5829 /* Handle an x86-64 specific section when reading an object file. This
5830 is called when elfcode.h finds a section with an unknown type. */
5833 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5834 const char *name, int shindex)
5836 if (hdr->sh_type != SHT_X86_64_UNWIND)
5839 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5845 /* Hook called by the linker routine which adds symbols from an object
5846 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5850 elf_x86_64_add_symbol_hook (bfd *abfd,
5851 struct bfd_link_info *info,
5852 Elf_Internal_Sym *sym,
5853 const char **namep ATTRIBUTE_UNUSED,
5854 flagword *flagsp ATTRIBUTE_UNUSED,
5860 switch (sym->st_shndx)
5862 case SHN_X86_64_LCOMMON:
5863 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
5866 lcomm = bfd_make_section_with_flags (abfd,
5870 | SEC_LINKER_CREATED));
5873 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
5876 *valp = sym->st_size;
5880 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5881 && (abfd->flags & DYNAMIC) == 0
5882 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5883 elf_tdata (info->output_bfd)->has_gnu_symbols
5884 |= elf_gnu_symbol_unique;
5890 /* Given a BFD section, try to locate the corresponding ELF section
5894 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
5895 asection *sec, int *index_return)
5897 if (sec == &_bfd_elf_large_com_section)
5899 *index_return = SHN_X86_64_LCOMMON;
5905 /* Process a symbol. */
5908 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5911 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5913 switch (elfsym->internal_elf_sym.st_shndx)
5915 case SHN_X86_64_LCOMMON:
5916 asym->section = &_bfd_elf_large_com_section;
5917 asym->value = elfsym->internal_elf_sym.st_size;
5918 /* Common symbol doesn't set BSF_GLOBAL. */
5919 asym->flags &= ~BSF_GLOBAL;
5925 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5927 return (sym->st_shndx == SHN_COMMON
5928 || sym->st_shndx == SHN_X86_64_LCOMMON);
5932 elf_x86_64_common_section_index (asection *sec)
5934 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5937 return SHN_X86_64_LCOMMON;
5941 elf_x86_64_common_section (asection *sec)
5943 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5944 return bfd_com_section_ptr;
5946 return &_bfd_elf_large_com_section;
5950 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
5951 const Elf_Internal_Sym *sym,
5956 const asection *oldsec)
5958 /* A normal common symbol and a large common symbol result in a
5959 normal common symbol. We turn the large common symbol into a
5962 && h->root.type == bfd_link_hash_common
5964 && bfd_is_com_section (*psec)
5967 if (sym->st_shndx == SHN_COMMON
5968 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
5970 h->root.u.c.p->section
5971 = bfd_make_section_old_way (oldbfd, "COMMON");
5972 h->root.u.c.p->section->flags = SEC_ALLOC;
5974 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5975 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
5976 *psec = bfd_com_section_ptr;
5983 elf_x86_64_additional_program_headers (bfd *abfd,
5984 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5989 /* Check to see if we need a large readonly segment. */
5990 s = bfd_get_section_by_name (abfd, ".lrodata");
5991 if (s && (s->flags & SEC_LOAD))
5994 /* Check to see if we need a large data segment. Since .lbss sections
5995 is placed right after the .bss section, there should be no need for
5996 a large data segment just because of .lbss. */
5997 s = bfd_get_section_by_name (abfd, ".ldata");
5998 if (s && (s->flags & SEC_LOAD))
6004 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6007 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
6009 if (h->plt.offset != (bfd_vma) -1
6011 && !h->pointer_equality_needed)
6014 return _bfd_elf_hash_symbol (h);
6017 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6020 elf_x86_64_relocs_compatible (const bfd_target *input,
6021 const bfd_target *output)
6023 return ((xvec_get_elf_backend_data (input)->s->elfclass
6024 == xvec_get_elf_backend_data (output)->s->elfclass)
6025 && _bfd_elf_relocs_compatible (input, output));
6028 static const struct bfd_elf_special_section
6029 elf_x86_64_special_sections[]=
6031 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6032 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6033 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6034 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6035 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6036 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6037 { NULL, 0, 0, 0, 0 }
6040 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6041 #define TARGET_LITTLE_NAME "elf64-x86-64"
6042 #define ELF_ARCH bfd_arch_i386
6043 #define ELF_TARGET_ID X86_64_ELF_DATA
6044 #define ELF_MACHINE_CODE EM_X86_64
6045 #define ELF_MAXPAGESIZE 0x200000
6046 #define ELF_MINPAGESIZE 0x1000
6047 #define ELF_COMMONPAGESIZE 0x1000
6049 #define elf_backend_can_gc_sections 1
6050 #define elf_backend_can_refcount 1
6051 #define elf_backend_want_got_plt 1
6052 #define elf_backend_plt_readonly 1
6053 #define elf_backend_want_plt_sym 0
6054 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6055 #define elf_backend_rela_normal 1
6056 #define elf_backend_plt_alignment 4
6057 #define elf_backend_extern_protected_data 1
6059 #define elf_info_to_howto elf_x86_64_info_to_howto
6061 #define bfd_elf64_bfd_link_hash_table_create \
6062 elf_x86_64_link_hash_table_create
6063 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6064 #define bfd_elf64_bfd_reloc_name_lookup \
6065 elf_x86_64_reloc_name_lookup
6067 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6068 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6069 #define elf_backend_check_relocs elf_x86_64_check_relocs
6070 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6071 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6072 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6073 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6074 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6075 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6076 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6077 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6079 #define elf_backend_write_core_note elf_x86_64_write_core_note
6081 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6082 #define elf_backend_relocate_section elf_x86_64_relocate_section
6083 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6084 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6085 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6086 #define elf_backend_object_p elf64_x86_64_elf_object_p
6087 #define bfd_elf64_mkobject elf_x86_64_mkobject
6088 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6090 #define elf_backend_section_from_shdr \
6091 elf_x86_64_section_from_shdr
6093 #define elf_backend_section_from_bfd_section \
6094 elf_x86_64_elf_section_from_bfd_section
6095 #define elf_backend_add_symbol_hook \
6096 elf_x86_64_add_symbol_hook
6097 #define elf_backend_symbol_processing \
6098 elf_x86_64_symbol_processing
6099 #define elf_backend_common_section_index \
6100 elf_x86_64_common_section_index
6101 #define elf_backend_common_section \
6102 elf_x86_64_common_section
6103 #define elf_backend_common_definition \
6104 elf_x86_64_common_definition
6105 #define elf_backend_merge_symbol \
6106 elf_x86_64_merge_symbol
6107 #define elf_backend_special_sections \
6108 elf_x86_64_special_sections
6109 #define elf_backend_additional_program_headers \
6110 elf_x86_64_additional_program_headers
6111 #define elf_backend_hash_symbol \
6112 elf_x86_64_hash_symbol
6114 #include "elf64-target.h"
6116 /* CloudABI support. */
6118 #undef TARGET_LITTLE_SYM
6119 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6120 #undef TARGET_LITTLE_NAME
6121 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6124 #define ELF_OSABI ELFOSABI_CLOUDABI
6127 #define elf64_bed elf64_x86_64_cloudabi_bed
6129 #include "elf64-target.h"
6131 /* FreeBSD support. */
6133 #undef TARGET_LITTLE_SYM
6134 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6135 #undef TARGET_LITTLE_NAME
6136 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6139 #define ELF_OSABI ELFOSABI_FREEBSD
6142 #define elf64_bed elf64_x86_64_fbsd_bed
6144 #include "elf64-target.h"
6146 /* Solaris 2 support. */
6148 #undef TARGET_LITTLE_SYM
6149 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6150 #undef TARGET_LITTLE_NAME
6151 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6153 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6154 objects won't be recognized. */
6158 #define elf64_bed elf64_x86_64_sol2_bed
6160 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6162 #undef elf_backend_static_tls_alignment
6163 #define elf_backend_static_tls_alignment 16
6165 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6167 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6169 #undef elf_backend_want_plt_sym
6170 #define elf_backend_want_plt_sym 1
6172 #include "elf64-target.h"
6174 /* Native Client support. */
6177 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
6179 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6180 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
6184 #undef TARGET_LITTLE_SYM
6185 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6186 #undef TARGET_LITTLE_NAME
6187 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6189 #define elf64_bed elf64_x86_64_nacl_bed
6191 #undef ELF_MAXPAGESIZE
6192 #undef ELF_MINPAGESIZE
6193 #undef ELF_COMMONPAGESIZE
6194 #define ELF_MAXPAGESIZE 0x10000
6195 #define ELF_MINPAGESIZE 0x10000
6196 #define ELF_COMMONPAGESIZE 0x10000
6198 /* Restore defaults. */
6200 #undef elf_backend_static_tls_alignment
6201 #undef elf_backend_want_plt_sym
6202 #define elf_backend_want_plt_sym 0
6204 /* NaCl uses substantially different PLT entries for the same effects. */
6206 #undef elf_backend_plt_alignment
6207 #define elf_backend_plt_alignment 5
6208 #define NACL_PLT_ENTRY_SIZE 64
6209 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6211 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6213 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6214 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6215 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6216 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6217 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6219 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6220 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6222 /* 32 bytes of nop to pad out to the standard size. */
6223 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6224 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6225 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6226 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6227 0x66, /* excess data32 prefix */
6231 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6233 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6234 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6235 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6236 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6238 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6239 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6240 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6242 /* Lazy GOT entries point here (32-byte aligned). */
6243 0x68, /* pushq immediate */
6244 0, 0, 0, 0, /* replaced with index into relocation table. */
6245 0xe9, /* jmp relative */
6246 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6248 /* 22 bytes of nop to pad out to the standard size. */
6249 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6250 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6251 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6254 /* .eh_frame covering the .plt section. */
6256 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6258 #if (PLT_CIE_LENGTH != 20 \
6259 || PLT_FDE_LENGTH != 36 \
6260 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6261 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6262 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6264 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6265 0, 0, 0, 0, /* CIE ID */
6266 1, /* CIE version */
6267 'z', 'R', 0, /* Augmentation string */
6268 1, /* Code alignment factor */
6269 0x78, /* Data alignment factor */
6270 16, /* Return address column */
6271 1, /* Augmentation size */
6272 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6273 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6274 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6275 DW_CFA_nop, DW_CFA_nop,
6277 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6278 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6279 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6280 0, 0, 0, 0, /* .plt size goes here */
6281 0, /* Augmentation size */
6282 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6283 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6284 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6285 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6286 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6287 13, /* Block length */
6288 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6289 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6290 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6291 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6292 DW_CFA_nop, DW_CFA_nop
6295 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6297 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6298 elf_x86_64_nacl_plt_entry, /* plt_entry */
6299 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6300 2, /* plt0_got1_offset */
6301 9, /* plt0_got2_offset */
6302 13, /* plt0_got2_insn_end */
6303 3, /* plt_got_offset */
6304 33, /* plt_reloc_offset */
6305 38, /* plt_plt_offset */
6306 7, /* plt_got_insn_size */
6307 42, /* plt_plt_insn_end */
6308 32, /* plt_lazy_offset */
6309 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6310 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6313 #undef elf_backend_arch_data
6314 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6316 #undef elf_backend_object_p
6317 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6318 #undef elf_backend_modify_segment_map
6319 #define elf_backend_modify_segment_map nacl_modify_segment_map
6320 #undef elf_backend_modify_program_headers
6321 #define elf_backend_modify_program_headers nacl_modify_program_headers
6322 #undef elf_backend_final_write_processing
6323 #define elf_backend_final_write_processing nacl_final_write_processing
6325 #include "elf64-target.h"
6327 /* Native Client x32 support. */
6330 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6332 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6333 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6337 #undef TARGET_LITTLE_SYM
6338 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6339 #undef TARGET_LITTLE_NAME
6340 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6342 #define elf32_bed elf32_x86_64_nacl_bed
6344 #define bfd_elf32_bfd_link_hash_table_create \
6345 elf_x86_64_link_hash_table_create
6346 #define bfd_elf32_bfd_reloc_type_lookup \
6347 elf_x86_64_reloc_type_lookup
6348 #define bfd_elf32_bfd_reloc_name_lookup \
6349 elf_x86_64_reloc_name_lookup
6350 #define bfd_elf32_mkobject \
6352 #define bfd_elf32_get_synthetic_symtab \
6353 elf_x86_64_get_synthetic_symtab
6355 #undef elf_backend_object_p
6356 #define elf_backend_object_p \
6357 elf32_x86_64_nacl_elf_object_p
6359 #undef elf_backend_bfd_from_remote_memory
6360 #define elf_backend_bfd_from_remote_memory \
6361 _bfd_elf32_bfd_from_remote_memory
6363 #undef elf_backend_size_info
6364 #define elf_backend_size_info \
6365 _bfd_elf32_size_info
6367 #include "elf32-target.h"
6369 /* Restore defaults. */
6370 #undef elf_backend_object_p
6371 #define elf_backend_object_p elf64_x86_64_elf_object_p
6372 #undef elf_backend_bfd_from_remote_memory
6373 #undef elf_backend_size_info
6374 #undef elf_backend_modify_segment_map
6375 #undef elf_backend_modify_program_headers
6376 #undef elf_backend_final_write_processing
6378 /* Intel L1OM support. */
6381 elf64_l1om_elf_object_p (bfd *abfd)
6383 /* Set the right machine number for an L1OM elf64 file. */
6384 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6388 #undef TARGET_LITTLE_SYM
6389 #define TARGET_LITTLE_SYM l1om_elf64_vec
6390 #undef TARGET_LITTLE_NAME
6391 #define TARGET_LITTLE_NAME "elf64-l1om"
6393 #define ELF_ARCH bfd_arch_l1om
6395 #undef ELF_MACHINE_CODE
6396 #define ELF_MACHINE_CODE EM_L1OM
6401 #define elf64_bed elf64_l1om_bed
6403 #undef elf_backend_object_p
6404 #define elf_backend_object_p elf64_l1om_elf_object_p
6406 /* Restore defaults. */
6407 #undef ELF_MAXPAGESIZE
6408 #undef ELF_MINPAGESIZE
6409 #undef ELF_COMMONPAGESIZE
6410 #define ELF_MAXPAGESIZE 0x200000
6411 #define ELF_MINPAGESIZE 0x1000
6412 #define ELF_COMMONPAGESIZE 0x1000
6413 #undef elf_backend_plt_alignment
6414 #define elf_backend_plt_alignment 4
6415 #undef elf_backend_arch_data
6416 #define elf_backend_arch_data &elf_x86_64_arch_bed
6418 #include "elf64-target.h"
6420 /* FreeBSD L1OM support. */
6422 #undef TARGET_LITTLE_SYM
6423 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6424 #undef TARGET_LITTLE_NAME
6425 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6428 #define ELF_OSABI ELFOSABI_FREEBSD
6431 #define elf64_bed elf64_l1om_fbsd_bed
6433 #include "elf64-target.h"
6435 /* Intel K1OM support. */
6438 elf64_k1om_elf_object_p (bfd *abfd)
6440 /* Set the right machine number for an K1OM elf64 file. */
6441 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6445 #undef TARGET_LITTLE_SYM
6446 #define TARGET_LITTLE_SYM k1om_elf64_vec
6447 #undef TARGET_LITTLE_NAME
6448 #define TARGET_LITTLE_NAME "elf64-k1om"
6450 #define ELF_ARCH bfd_arch_k1om
6452 #undef ELF_MACHINE_CODE
6453 #define ELF_MACHINE_CODE EM_K1OM
6458 #define elf64_bed elf64_k1om_bed
6460 #undef elf_backend_object_p
6461 #define elf_backend_object_p elf64_k1om_elf_object_p
6463 #undef elf_backend_static_tls_alignment
6465 #undef elf_backend_want_plt_sym
6466 #define elf_backend_want_plt_sym 0
6468 #include "elf64-target.h"
6470 /* FreeBSD K1OM support. */
6472 #undef TARGET_LITTLE_SYM
6473 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6474 #undef TARGET_LITTLE_NAME
6475 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6478 #define ELF_OSABI ELFOSABI_FREEBSD
6481 #define elf64_bed elf64_k1om_fbsd_bed
6483 #include "elf64-target.h"
6485 /* 32bit x86-64 support. */
6487 #undef TARGET_LITTLE_SYM
6488 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6489 #undef TARGET_LITTLE_NAME
6490 #define TARGET_LITTLE_NAME "elf32-x86-64"
6494 #define ELF_ARCH bfd_arch_i386
6496 #undef ELF_MACHINE_CODE
6497 #define ELF_MACHINE_CODE EM_X86_64
6501 #undef elf_backend_object_p
6502 #define elf_backend_object_p \
6503 elf32_x86_64_elf_object_p
6505 #undef elf_backend_bfd_from_remote_memory
6506 #define elf_backend_bfd_from_remote_memory \
6507 _bfd_elf32_bfd_from_remote_memory
6509 #undef elf_backend_size_info
6510 #define elf_backend_size_info \
6511 _bfd_elf32_size_info
6513 #include "elf32-target.h"