1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2018 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
22 #include "elfxx-x86.h"
25 #include "libiberty.h"
27 #include "opcode/i386.h"
28 #include "elf/x86-64.h"
35 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
36 #define MINUS_ONE (~ (bfd_vma) 0)
38 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
39 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
40 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
41 since they are the same. */
43 /* The relocation "howto" table. Order of fields:
44 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
45 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
46 static reloc_howto_type x86_64_elf_howto_table[] =
48 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
49 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
51 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
54 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
55 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
57 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
58 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
60 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
61 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
63 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
69 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
72 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
75 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
76 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
78 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
79 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
81 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
82 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
84 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
86 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
88 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
90 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
91 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
92 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
95 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
98 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
101 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
102 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
104 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
107 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
108 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
110 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
113 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
114 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
116 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
119 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
121 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
122 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
124 FALSE, 0xffffffff, 0xffffffff, TRUE),
125 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
126 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
128 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
129 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
131 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
133 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
134 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
135 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
137 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
138 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
140 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
141 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
143 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
144 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
146 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
147 complain_overflow_bitfield, bfd_elf_generic_reloc,
148 "R_X86_64_GOTPC32_TLSDESC",
149 FALSE, 0xffffffff, 0xffffffff, TRUE),
150 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
151 complain_overflow_dont, bfd_elf_generic_reloc,
152 "R_X86_64_TLSDESC_CALL",
154 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
155 complain_overflow_bitfield, bfd_elf_generic_reloc,
157 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
158 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
161 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
164 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
165 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
167 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
168 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
170 HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
171 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
173 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
174 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
177 /* We have a gap in the reloc numbers here.
178 R_X86_64_standard counts the number up to this point, and
179 R_X86_64_vt_offset is the value to subtract from a reloc type of
180 R_X86_64_GNU_VT* to form an index into this table. */
181 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
182 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
184 /* GNU extension to record C++ vtable hierarchy. */
185 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
186 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
188 /* GNU extension to record C++ vtable member usage. */
189 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
190 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
193 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
194 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
195 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
199 /* Set if a relocation is converted from a GOTPCREL relocation. */
200 #define R_X86_64_converted_reloc_bit (1 << 7)
202 #define X86_PCREL_TYPE_P(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 #define X86_SIZE_TYPE_P(TYPE) \
210 ((TYPE) == R_X86_64_SIZE32 || (TYPE) == R_X86_64_SIZE64)
212 /* Map BFD relocs to the x86_64 elf relocs. */
215 bfd_reloc_code_real_type bfd_reloc_val;
216 unsigned char elf_reloc_val;
219 static const struct elf_reloc_map x86_64_reloc_map[] =
221 { BFD_RELOC_NONE, R_X86_64_NONE, },
222 { BFD_RELOC_64, R_X86_64_64, },
223 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
224 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
225 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
226 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
227 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
228 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
229 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
230 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
231 { BFD_RELOC_32, R_X86_64_32, },
232 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
233 { BFD_RELOC_16, R_X86_64_16, },
234 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
235 { BFD_RELOC_8, R_X86_64_8, },
236 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
237 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
238 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
239 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
240 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
241 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
242 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
243 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
244 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
245 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
246 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
247 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
248 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
249 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
250 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
251 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
252 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
253 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
254 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
255 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
256 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
257 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
258 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
259 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
260 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
261 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
262 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
263 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
264 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
267 static reloc_howto_type *
268 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
272 if (r_type == (unsigned int) R_X86_64_32)
277 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
279 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
280 || r_type >= (unsigned int) R_X86_64_max)
282 if (r_type >= (unsigned int) R_X86_64_standard)
284 /* xgettext:c-format */
285 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
287 bfd_set_error (bfd_error_bad_value);
293 i = r_type - (unsigned int) R_X86_64_vt_offset;
294 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
295 return &x86_64_elf_howto_table[i];
298 /* Given a BFD reloc type, return a HOWTO structure. */
299 static reloc_howto_type *
300 elf_x86_64_reloc_type_lookup (bfd *abfd,
301 bfd_reloc_code_real_type code)
305 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
308 if (x86_64_reloc_map[i].bfd_reloc_val == code)
309 return elf_x86_64_rtype_to_howto (abfd,
310 x86_64_reloc_map[i].elf_reloc_val);
315 static reloc_howto_type *
316 elf_x86_64_reloc_name_lookup (bfd *abfd,
321 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
323 /* Get x32 R_X86_64_32. */
324 reloc_howto_type *reloc
325 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
326 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
330 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
331 if (x86_64_elf_howto_table[i].name != NULL
332 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
333 return &x86_64_elf_howto_table[i];
338 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
341 elf_x86_64_info_to_howto (bfd *abfd, arelent *cache_ptr,
342 Elf_Internal_Rela *dst)
346 r_type = ELF32_R_TYPE (dst->r_info);
347 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
348 if (cache_ptr->howto == NULL)
350 BFD_ASSERT (r_type == cache_ptr->howto->type || cache_ptr->howto->type == R_X86_64_NONE);
354 /* Support for core dump NOTE sections. */
356 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
361 switch (note->descsz)
366 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
368 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
371 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
379 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
381 elf_tdata (abfd)->core->signal
382 = bfd_get_16 (abfd, note->descdata + 12);
385 elf_tdata (abfd)->core->lwpid
386 = bfd_get_32 (abfd, note->descdata + 32);
395 /* Make a ".reg/999" section. */
396 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
397 size, note->descpos + offset);
401 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
403 switch (note->descsz)
408 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
409 elf_tdata (abfd)->core->pid
410 = bfd_get_32 (abfd, note->descdata + 12);
411 elf_tdata (abfd)->core->program
412 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
413 elf_tdata (abfd)->core->command
414 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
417 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
418 elf_tdata (abfd)->core->pid
419 = bfd_get_32 (abfd, note->descdata + 24);
420 elf_tdata (abfd)->core->program
421 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
422 elf_tdata (abfd)->core->command
423 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
426 /* Note that for some reason, a spurious space is tacked
427 onto the end of the args in some (at least one anyway)
428 implementations, so strip it off if it exists. */
431 char *command = elf_tdata (abfd)->core->command;
432 int n = strlen (command);
434 if (0 < n && command[n - 1] == ' ')
435 command[n - 1] = '\0';
443 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
446 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
448 const char *fname, *psargs;
459 va_start (ap, note_type);
460 fname = va_arg (ap, const char *);
461 psargs = va_arg (ap, const char *);
464 if (bed->s->elfclass == ELFCLASS32)
467 memset (&data, 0, sizeof (data));
468 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
469 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
470 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
471 &data, sizeof (data));
476 memset (&data, 0, sizeof (data));
477 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
478 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
479 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
480 &data, sizeof (data));
485 va_start (ap, note_type);
486 pid = va_arg (ap, long);
487 cursig = va_arg (ap, int);
488 gregs = va_arg (ap, const void *);
491 if (bed->s->elfclass == ELFCLASS32)
493 if (bed->elf_machine_code == EM_X86_64)
495 prstatusx32_t 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));
506 memset (&prstat, 0, sizeof (prstat));
508 prstat.pr_cursig = cursig;
509 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
510 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
511 &prstat, sizeof (prstat));
517 memset (&prstat, 0, sizeof (prstat));
519 prstat.pr_cursig = cursig;
520 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
521 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
522 &prstat, sizeof (prstat));
529 /* Functions for the x86-64 ELF linker. */
531 /* The size in bytes of an entry in the global offset table. */
533 #define GOT_ENTRY_SIZE 8
535 /* The size in bytes of an entry in the lazy procedure linkage table. */
537 #define LAZY_PLT_ENTRY_SIZE 16
539 /* The size in bytes of an entry in the non-lazy procedure linkage
542 #define NON_LAZY_PLT_ENTRY_SIZE 8
544 /* The first entry in a lazy procedure linkage table looks like this.
545 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this
548 static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
550 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
551 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
552 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
555 /* Subsequent entries in a lazy procedure linkage table look like this. */
557 static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
559 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
560 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
561 0x68, /* pushq immediate */
562 0, 0, 0, 0, /* replaced with index into relocation table. */
563 0xe9, /* jmp relative */
564 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
567 /* The first entry in a lazy procedure linkage table with BND prefix
570 static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
572 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
573 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
574 0x0f, 0x1f, 0 /* nopl (%rax) */
577 /* Subsequent entries for branches with BND prefx in a lazy procedure
578 linkage table look like this. */
580 static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] =
582 0x68, 0, 0, 0, 0, /* pushq immediate */
583 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
584 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
587 /* The first entry in the IBT-enabled lazy procedure linkage table is the
588 the same as the lazy PLT with BND prefix so that bound registers are
589 preserved when control is passed to dynamic linker. Subsequent
590 entries for a IBT-enabled lazy procedure linkage table look like
593 static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
595 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
596 0x68, 0, 0, 0, 0, /* pushq immediate */
597 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
601 /* The first entry in the x32 IBT-enabled lazy procedure linkage table
602 is the same as the normal lazy PLT. Subsequent entries for an
603 x32 IBT-enabled lazy procedure linkage table look like this. */
605 static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
607 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
608 0x68, 0, 0, 0, 0, /* pushq immediate */
609 0xe9, 0, 0, 0, 0, /* jmpq relative */
610 0x66, 0x90 /* xchg %ax,%ax */
613 /* Entries in the non-lazey procedure linkage table look like this. */
615 static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
617 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
619 0x66, 0x90 /* xchg %ax,%ax */
622 /* Entries for branches with BND prefix in the non-lazey procedure
623 linkage table look like this. */
625 static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
627 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
628 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
632 /* Entries for branches with IBT-enabled in the non-lazey procedure
633 linkage table look like this. They have the same size as the lazy
636 static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
638 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
639 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
640 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
641 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */
644 /* Entries for branches with IBT-enabled in the x32 non-lazey procedure
645 linkage table look like this. They have the same size as the lazy
648 static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
650 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
651 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
652 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
653 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
656 /* .eh_frame covering the lazy .plt section. */
658 static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] =
660 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
661 0, 0, 0, 0, /* CIE ID */
663 'z', 'R', 0, /* Augmentation string */
664 1, /* Code alignment factor */
665 0x78, /* Data alignment factor */
666 16, /* Return address column */
667 1, /* Augmentation size */
668 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
669 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
670 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
671 DW_CFA_nop, DW_CFA_nop,
673 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
674 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
675 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
676 0, 0, 0, 0, /* .plt size goes here */
677 0, /* Augmentation size */
678 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
679 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
680 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
681 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
682 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
683 11, /* Block length */
684 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
685 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
686 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
687 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
688 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
691 /* .eh_frame covering the lazy BND .plt section. */
693 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] =
695 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
696 0, 0, 0, 0, /* CIE ID */
698 'z', 'R', 0, /* Augmentation string */
699 1, /* Code alignment factor */
700 0x78, /* Data alignment factor */
701 16, /* Return address column */
702 1, /* Augmentation size */
703 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
704 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
705 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
706 DW_CFA_nop, DW_CFA_nop,
708 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
709 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
710 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
711 0, 0, 0, 0, /* .plt size goes here */
712 0, /* Augmentation size */
713 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
714 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
715 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
716 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
717 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
718 11, /* Block length */
719 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
720 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
721 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge,
722 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
723 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
726 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
728 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] =
730 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
731 0, 0, 0, 0, /* CIE ID */
733 'z', 'R', 0, /* Augmentation string */
734 1, /* Code alignment factor */
735 0x78, /* Data alignment factor */
736 16, /* Return address column */
737 1, /* Augmentation size */
738 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
739 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
740 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
741 DW_CFA_nop, DW_CFA_nop,
743 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
744 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
745 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
746 0, 0, 0, 0, /* .plt size goes here */
747 0, /* Augmentation size */
748 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
749 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
750 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
751 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
752 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
753 11, /* Block length */
754 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
755 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
756 DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge,
757 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
758 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
761 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */
763 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] =
765 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
766 0, 0, 0, 0, /* CIE ID */
768 'z', 'R', 0, /* Augmentation string */
769 1, /* Code alignment factor */
770 0x78, /* Data alignment factor */
771 16, /* Return address column */
772 1, /* Augmentation size */
773 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
774 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
775 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
776 DW_CFA_nop, DW_CFA_nop,
778 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
779 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
780 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
781 0, 0, 0, 0, /* .plt size goes here */
782 0, /* Augmentation size */
783 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
784 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
785 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
786 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
787 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
788 11, /* Block length */
789 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
790 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
791 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
792 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
793 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
796 /* .eh_frame covering the non-lazy .plt section. */
798 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] =
800 #define PLT_GOT_FDE_LENGTH 20
801 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
802 0, 0, 0, 0, /* CIE ID */
804 'z', 'R', 0, /* Augmentation string */
805 1, /* Code alignment factor */
806 0x78, /* Data alignment factor */
807 16, /* Return address column */
808 1, /* Augmentation size */
809 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
810 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
811 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
812 DW_CFA_nop, DW_CFA_nop,
814 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
815 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
816 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
817 0, 0, 0, 0, /* non-lazy .plt size goes here */
818 0, /* Augmentation size */
819 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,
820 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
823 /* These are the standard parameters. */
824 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt =
826 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
827 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
828 elf_x86_64_lazy_plt_entry, /* plt_entry */
829 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
830 2, /* plt0_got1_offset */
831 8, /* plt0_got2_offset */
832 12, /* plt0_got2_insn_end */
833 2, /* plt_got_offset */
834 7, /* plt_reloc_offset */
835 12, /* plt_plt_offset */
836 6, /* plt_got_insn_size */
837 LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */
838 6, /* plt_lazy_offset */
839 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */
840 elf_x86_64_lazy_plt_entry, /* pic_plt_entry */
841 elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */
842 sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */
845 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt =
847 elf_x86_64_non_lazy_plt_entry, /* plt_entry */
848 elf_x86_64_non_lazy_plt_entry, /* pic_plt_entry */
849 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
850 2, /* plt_got_offset */
851 6, /* plt_got_insn_size */
852 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
853 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
856 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt =
858 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
859 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
860 elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */
861 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
862 2, /* plt0_got1_offset */
863 1+8, /* plt0_got2_offset */
864 1+12, /* plt0_got2_insn_end */
865 1+2, /* plt_got_offset */
866 1, /* plt_reloc_offset */
867 7, /* plt_plt_offset */
868 1+6, /* plt_got_insn_size */
869 11, /* plt_plt_insn_end */
870 0, /* plt_lazy_offset */
871 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */
872 elf_x86_64_lazy_bnd_plt_entry, /* pic_plt_entry */
873 elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */
874 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */
877 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt =
879 elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */
880 elf_x86_64_non_lazy_bnd_plt_entry, /* pic_plt_entry */
881 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
882 1+2, /* plt_got_offset */
883 1+6, /* plt_got_insn_size */
884 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
885 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
888 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt =
890 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
891 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
892 elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */
893 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
894 2, /* plt0_got1_offset */
895 1+8, /* plt0_got2_offset */
896 1+12, /* plt0_got2_insn_end */
897 4+1+2, /* plt_got_offset */
898 4+1, /* plt_reloc_offset */
899 4+1+6, /* plt_plt_offset */
900 4+1+6, /* plt_got_insn_size */
901 4+1+5+5, /* plt_plt_insn_end */
902 0, /* plt_lazy_offset */
903 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */
904 elf_x86_64_lazy_ibt_plt_entry, /* pic_plt_entry */
905 elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
906 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
909 static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt =
911 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
912 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
913 elf_x32_lazy_ibt_plt_entry, /* plt_entry */
914 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
915 2, /* plt0_got1_offset */
916 8, /* plt0_got2_offset */
917 12, /* plt0_got2_insn_end */
918 4+2, /* plt_got_offset */
919 4+1, /* plt_reloc_offset */
920 4+6, /* plt_plt_offset */
921 4+6, /* plt_got_insn_size */
922 4+5+5, /* plt_plt_insn_end */
923 0, /* plt_lazy_offset */
924 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */
925 elf_x32_lazy_ibt_plt_entry, /* pic_plt_entry */
926 elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
927 sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
930 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt =
932 elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */
933 elf_x86_64_non_lazy_ibt_plt_entry, /* pic_plt_entry */
934 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
935 4+1+2, /* plt_got_offset */
936 4+1+6, /* plt_got_insn_size */
937 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
938 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
941 static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt =
943 elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */
944 elf_x32_non_lazy_ibt_plt_entry, /* pic_plt_entry */
945 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
946 4+2, /* plt_got_offset */
947 4+6, /* plt_got_insn_size */
948 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
949 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
952 static const struct elf_x86_backend_data elf_x86_64_arch_bed =
957 #define elf_backend_arch_data &elf_x86_64_arch_bed
960 elf64_x86_64_elf_object_p (bfd *abfd)
962 /* Set the right machine number for an x86-64 elf64 file. */
963 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
968 elf32_x86_64_elf_object_p (bfd *abfd)
970 /* Set the right machine number for an x86-64 elf32 file. */
971 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
975 /* Return TRUE if the TLS access code sequence support transition
979 elf_x86_64_check_tls_transition (bfd *abfd,
980 struct bfd_link_info *info,
983 Elf_Internal_Shdr *symtab_hdr,
984 struct elf_link_hash_entry **sym_hashes,
986 const Elf_Internal_Rela *rel,
987 const Elf_Internal_Rela *relend)
990 unsigned long r_symndx;
991 bfd_boolean largepic = FALSE;
992 struct elf_link_hash_entry *h;
994 struct elf_x86_link_hash_table *htab;
996 bfd_boolean indirect_call;
998 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
999 offset = rel->r_offset;
1002 case R_X86_64_TLSGD:
1003 case R_X86_64_TLSLD:
1004 if ((rel + 1) >= relend)
1007 if (r_type == R_X86_64_TLSGD)
1009 /* Check transition from GD access model. For 64bit, only
1010 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1011 .word 0x6666; rex64; call __tls_get_addr@PLT
1013 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1015 call *__tls_get_addr@GOTPCREL(%rip)
1016 which may be converted to
1017 addr32 call __tls_get_addr
1018 can transit to different access model. For 32bit, only
1019 leaq foo@tlsgd(%rip), %rdi
1020 .word 0x6666; rex64; call __tls_get_addr@PLT
1022 leaq foo@tlsgd(%rip), %rdi
1024 call *__tls_get_addr@GOTPCREL(%rip)
1025 which may be converted to
1026 addr32 call __tls_get_addr
1027 can transit to different access model. For largepic,
1029 leaq foo@tlsgd(%rip), %rdi
1030 movabsq $__tls_get_addr@pltoff, %rax
1034 leaq foo@tlsgd(%rip), %rdi
1035 movabsq $__tls_get_addr@pltoff, %rax
1039 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1041 if ((offset + 12) > sec->size)
1044 call = contents + offset + 4;
1046 || !((call[1] == 0x48
1054 && call[3] == 0xe8)))
1056 if (!ABI_64_P (abfd)
1057 || (offset + 19) > sec->size
1059 || memcmp (call - 7, leaq + 1, 3) != 0
1060 || memcmp (call, "\x48\xb8", 2) != 0
1064 || !((call[10] == 0x48 && call[12] == 0xd8)
1065 || (call[10] == 0x4c && call[12] == 0xf8)))
1069 else if (ABI_64_P (abfd))
1072 || memcmp (contents + offset - 4, leaq, 4) != 0)
1078 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1081 indirect_call = call[2] == 0xff;
1085 /* Check transition from LD access model. Only
1086 leaq foo@tlsld(%rip), %rdi;
1087 call __tls_get_addr@PLT
1089 leaq foo@tlsld(%rip), %rdi;
1090 call *__tls_get_addr@GOTPCREL(%rip)
1091 which may be converted to
1092 addr32 call __tls_get_addr
1093 can transit to different access model. For largepic
1095 leaq foo@tlsld(%rip), %rdi
1096 movabsq $__tls_get_addr@pltoff, %rax
1100 leaq foo@tlsld(%rip), %rdi
1101 movabsq $__tls_get_addr@pltoff, %rax
1105 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1107 if (offset < 3 || (offset + 9) > sec->size)
1110 if (memcmp (contents + offset - 3, lea, 3) != 0)
1113 call = contents + offset + 4;
1114 if (!(call[0] == 0xe8
1115 || (call[0] == 0xff && call[1] == 0x15)
1116 || (call[0] == 0x67 && call[1] == 0xe8)))
1118 if (!ABI_64_P (abfd)
1119 || (offset + 19) > sec->size
1120 || memcmp (call, "\x48\xb8", 2) != 0
1124 || !((call[10] == 0x48 && call[12] == 0xd8)
1125 || (call[10] == 0x4c && call[12] == 0xf8)))
1129 indirect_call = call[0] == 0xff;
1132 r_symndx = htab->r_sym (rel[1].r_info);
1133 if (r_symndx < symtab_hdr->sh_info)
1136 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1138 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
1142 r_type = (ELF32_R_TYPE (rel[1].r_info)
1143 & ~R_X86_64_converted_reloc_bit);
1145 return r_type == R_X86_64_PLTOFF64;
1146 else if (indirect_call)
1147 return r_type == R_X86_64_GOTPCRELX;
1149 return (r_type == R_X86_64_PC32 || r_type == R_X86_64_PLT32);
1152 case R_X86_64_GOTTPOFF:
1153 /* Check transition from IE access model:
1154 mov foo@gottpoff(%rip), %reg
1155 add foo@gottpoff(%rip), %reg
1158 /* Check REX prefix first. */
1159 if (offset >= 3 && (offset + 4) <= sec->size)
1161 val = bfd_get_8 (abfd, contents + offset - 3);
1162 if (val != 0x48 && val != 0x4c)
1164 /* X32 may have 0x44 REX prefix or no REX prefix. */
1165 if (ABI_64_P (abfd))
1171 /* X32 may not have any REX prefix. */
1172 if (ABI_64_P (abfd))
1174 if (offset < 2 || (offset + 3) > sec->size)
1178 val = bfd_get_8 (abfd, contents + offset - 2);
1179 if (val != 0x8b && val != 0x03)
1182 val = bfd_get_8 (abfd, contents + offset - 1);
1183 return (val & 0xc7) == 5;
1185 case R_X86_64_GOTPC32_TLSDESC:
1186 /* Check transition from GDesc access model:
1187 leaq x@tlsdesc(%rip), %rax
1189 Make sure it's a leaq adding rip to a 32-bit offset
1190 into any register, although it's probably almost always
1193 if (offset < 3 || (offset + 4) > sec->size)
1196 val = bfd_get_8 (abfd, contents + offset - 3);
1197 if ((val & 0xfb) != 0x48)
1200 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1203 val = bfd_get_8 (abfd, contents + offset - 1);
1204 return (val & 0xc7) == 0x05;
1206 case R_X86_64_TLSDESC_CALL:
1207 /* Check transition from GDesc access model:
1208 call *x@tlsdesc(%rax)
1210 if (offset + 2 <= sec->size)
1212 /* Make sure that it's a call *x@tlsdesc(%rax). */
1213 call = contents + offset;
1214 return call[0] == 0xff && call[1] == 0x10;
1224 /* Return TRUE if the TLS access transition is OK or no transition
1225 will be performed. Update R_TYPE if there is a transition. */
1228 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1229 asection *sec, bfd_byte *contents,
1230 Elf_Internal_Shdr *symtab_hdr,
1231 struct elf_link_hash_entry **sym_hashes,
1232 unsigned int *r_type, int tls_type,
1233 const Elf_Internal_Rela *rel,
1234 const Elf_Internal_Rela *relend,
1235 struct elf_link_hash_entry *h,
1236 unsigned long r_symndx,
1237 bfd_boolean from_relocate_section)
1239 unsigned int from_type = *r_type;
1240 unsigned int to_type = from_type;
1241 bfd_boolean check = TRUE;
1243 /* Skip TLS transition for functions. */
1245 && (h->type == STT_FUNC
1246 || h->type == STT_GNU_IFUNC))
1251 case R_X86_64_TLSGD:
1252 case R_X86_64_GOTPC32_TLSDESC:
1253 case R_X86_64_TLSDESC_CALL:
1254 case R_X86_64_GOTTPOFF:
1255 if (bfd_link_executable (info))
1258 to_type = R_X86_64_TPOFF32;
1260 to_type = R_X86_64_GOTTPOFF;
1263 /* When we are called from elf_x86_64_relocate_section, there may
1264 be additional transitions based on TLS_TYPE. */
1265 if (from_relocate_section)
1267 unsigned int new_to_type = to_type;
1269 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1270 new_to_type = R_X86_64_TPOFF32;
1272 if (to_type == R_X86_64_TLSGD
1273 || to_type == R_X86_64_GOTPC32_TLSDESC
1274 || to_type == R_X86_64_TLSDESC_CALL)
1276 if (tls_type == GOT_TLS_IE)
1277 new_to_type = R_X86_64_GOTTPOFF;
1280 /* We checked the transition before when we were called from
1281 elf_x86_64_check_relocs. We only want to check the new
1282 transition which hasn't been checked before. */
1283 check = new_to_type != to_type && from_type == to_type;
1284 to_type = new_to_type;
1289 case R_X86_64_TLSLD:
1290 if (bfd_link_executable (info))
1291 to_type = R_X86_64_TPOFF32;
1298 /* Return TRUE if there is no transition. */
1299 if (from_type == to_type)
1302 /* Check if the transition can be performed. */
1304 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1305 symtab_hdr, sym_hashes,
1306 from_type, rel, relend))
1308 reloc_howto_type *from, *to;
1311 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1312 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1314 if (from == NULL || to == NULL)
1318 name = h->root.root.string;
1321 struct elf_x86_link_hash_table *htab;
1323 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1328 Elf_Internal_Sym *isym;
1330 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1332 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1337 /* xgettext:c-format */
1338 (_("%pB: TLS transition from %s to %s against `%s' at %#" PRIx64
1339 " in section `%pA' failed"),
1340 abfd, from->name, to->name, name, (uint64_t) rel->r_offset, sec);
1341 bfd_set_error (bfd_error_bad_value);
1349 /* Rename some of the generic section flags to better document how they
1351 #define check_relocs_failed sec_flg0
1354 elf_x86_64_need_pic (struct bfd_link_info *info,
1355 bfd *input_bfd, asection *sec,
1356 struct elf_link_hash_entry *h,
1357 Elf_Internal_Shdr *symtab_hdr,
1358 Elf_Internal_Sym *isym,
1359 reloc_howto_type *howto)
1362 const char *und = "";
1363 const char *pic = "";
1369 name = h->root.root.string;
1370 switch (ELF_ST_VISIBILITY (h->other))
1373 v = _("hidden symbol ");
1376 v = _("internal symbol ");
1379 v = _("protected symbol ");
1382 if (((struct elf_x86_link_hash_entry *) h)->def_protected)
1383 v = _("protected symbol ");
1386 pic = _("; recompile with -fPIC");
1390 if (!h->def_regular && !h->def_dynamic)
1391 und = _("undefined ");
1395 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
1396 pic = _("; recompile with -fPIC");
1399 if (bfd_link_dll (info))
1400 object = _("a shared object");
1401 else if (bfd_link_pie (info))
1402 object = _("a PIE object");
1404 object = _("a PDE object");
1406 /* xgettext:c-format */
1407 _bfd_error_handler (_("%pB: relocation %s against %s%s`%s' can "
1408 "not be used when making %s%s"),
1409 input_bfd, howto->name, und, v, name,
1411 bfd_set_error (bfd_error_bad_value);
1412 sec->check_relocs_failed = 1;
1416 /* With the local symbol, foo, we convert
1417 mov foo@GOTPCREL(%rip), %reg
1421 call/jmp *foo@GOTPCREL(%rip)
1423 nop call foo/jmp foo nop
1424 When PIC is false, convert
1425 test %reg, foo@GOTPCREL(%rip)
1429 binop foo@GOTPCREL(%rip), %reg
1432 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1436 elf_x86_64_convert_load_reloc (bfd *abfd,
1438 unsigned int *r_type_p,
1439 Elf_Internal_Rela *irel,
1440 struct elf_link_hash_entry *h,
1441 bfd_boolean *converted,
1442 struct bfd_link_info *link_info)
1444 struct elf_x86_link_hash_table *htab;
1446 bfd_boolean no_overflow;
1448 bfd_boolean to_reloc_pc32;
1450 bfd_signed_vma raddend;
1451 unsigned int opcode;
1453 unsigned int r_type = *r_type_p;
1454 unsigned int r_symndx;
1455 bfd_vma roff = irel->r_offset;
1457 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
1460 raddend = irel->r_addend;
1461 /* Addend for 32-bit PC-relative relocation must be -4. */
1465 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA);
1466 is_pic = bfd_link_pic (link_info);
1468 relocx = (r_type == R_X86_64_GOTPCRELX
1469 || r_type == R_X86_64_REX_GOTPCRELX);
1471 /* TRUE if --no-relax is used. */
1472 no_overflow = link_info->disable_target_specific_optimizations > 1;
1474 r_symndx = htab->r_sym (irel->r_info);
1476 opcode = bfd_get_8 (abfd, contents + roff - 2);
1478 /* Convert mov to lea since it has been done for a while. */
1481 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1482 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1483 test, xor instructions. */
1488 /* We convert only to R_X86_64_PC32:
1490 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1491 3. no_overflow is true.
1494 to_reloc_pc32 = (opcode == 0xff
1499 /* Get the symbol referred to by the reloc. */
1502 Elf_Internal_Sym *isym
1503 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
1505 /* Skip relocation against undefined symbols. */
1506 if (isym->st_shndx == SHN_UNDEF)
1509 if (isym->st_shndx == SHN_ABS)
1510 tsec = bfd_abs_section_ptr;
1511 else if (isym->st_shndx == SHN_COMMON)
1512 tsec = bfd_com_section_ptr;
1513 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
1514 tsec = &_bfd_elf_large_com_section;
1516 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1520 /* Undefined weak symbol is only bound locally in executable
1521 and its reference is resolved as 0 without relocation
1522 overflow. We can only perform this optimization for
1523 GOTPCRELX relocations since we need to modify REX byte.
1524 It is OK convert mov with R_X86_64_GOTPCREL to
1526 bfd_boolean local_ref;
1527 struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
1529 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1530 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1531 if ((relocx || opcode == 0x8b)
1532 && (h->root.type == bfd_link_hash_undefweak
1538 /* Skip for branch instructions since R_X86_64_PC32
1545 /* For non-branch instructions, we can convert to
1546 R_X86_64_32/R_X86_64_32S since we know if there
1548 to_reloc_pc32 = FALSE;
1551 /* Since we don't know the current PC when PIC is true,
1552 we can't convert to R_X86_64_PC32. */
1553 if (to_reloc_pc32 && is_pic)
1558 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1559 ld.so may use its link-time address. */
1560 else if (h->start_stop
1563 || h->root.type == bfd_link_hash_defined
1564 || h->root.type == bfd_link_hash_defweak)
1565 && h != htab->elf.hdynamic
1568 /* bfd_link_hash_new or bfd_link_hash_undefined is
1569 set by an assignment in a linker script in
1570 bfd_elf_record_link_assignment. start_stop is set
1571 on __start_SECNAME/__stop_SECNAME which mark section
1576 && (h->root.type == bfd_link_hash_new
1577 || h->root.type == bfd_link_hash_undefined
1578 || ((h->root.type == bfd_link_hash_defined
1579 || h->root.type == bfd_link_hash_defweak)
1580 && h->root.u.def.section == bfd_und_section_ptr))))
1582 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1587 tsec = h->root.u.def.section;
1593 /* Don't convert GOTPCREL relocation against large section. */
1594 if (elf_section_data (tsec) != NULL
1595 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
1598 /* Skip since R_X86_64_PC32/R_X86_64_32/R_X86_64_32S may overflow. */
1605 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
1610 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
1612 modrm = bfd_get_8 (abfd, contents + roff - 1);
1615 /* Convert to "jmp foo nop". */
1618 nop_offset = irel->r_offset + 3;
1619 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1620 irel->r_offset -= 1;
1621 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1625 struct elf_x86_link_hash_entry *eh
1626 = (struct elf_x86_link_hash_entry *) h;
1628 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1631 /* To support TLS optimization, always use addr32 prefix for
1632 "call *__tls_get_addr@GOTPCREL(%rip)". */
1633 if (eh && eh->tls_get_addr)
1636 nop_offset = irel->r_offset - 2;
1640 nop = link_info->call_nop_byte;
1641 if (link_info->call_nop_as_suffix)
1643 nop_offset = irel->r_offset + 3;
1644 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1645 irel->r_offset -= 1;
1646 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1649 nop_offset = irel->r_offset - 2;
1652 bfd_put_8 (abfd, nop, contents + nop_offset);
1653 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1654 r_type = R_X86_64_PC32;
1659 unsigned int rex_mask = REX_R;
1661 if (r_type == R_X86_64_REX_GOTPCRELX)
1662 rex = bfd_get_8 (abfd, contents + roff - 3);
1670 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1671 "lea foo(%rip), %reg". */
1673 r_type = R_X86_64_PC32;
1677 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1678 "mov $foo, %reg". */
1680 modrm = bfd_get_8 (abfd, contents + roff - 1);
1681 modrm = 0xc0 | (modrm & 0x38) >> 3;
1682 if ((rex & REX_W) != 0
1683 && ABI_64_P (link_info->output_bfd))
1685 /* Keep the REX_W bit in REX byte for LP64. */
1686 r_type = R_X86_64_32S;
1687 goto rewrite_modrm_rex;
1691 /* If the REX_W bit in REX byte isn't needed,
1692 use R_X86_64_32 and clear the W bit to avoid
1693 sign-extend imm32 to imm64. */
1694 r_type = R_X86_64_32;
1695 /* Clear the W bit in REX byte. */
1697 goto rewrite_modrm_rex;
1703 /* R_X86_64_PC32 isn't supported. */
1707 modrm = bfd_get_8 (abfd, contents + roff - 1);
1710 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
1711 "test $foo, %reg". */
1712 modrm = 0xc0 | (modrm & 0x38) >> 3;
1717 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
1718 "binop $foo, %reg". */
1719 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
1723 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
1724 overflow when sign-extending imm32 to imm64. */
1725 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
1728 bfd_put_8 (abfd, modrm, contents + roff - 1);
1732 /* Move the R bit to the B bit in REX byte. */
1733 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
1734 bfd_put_8 (abfd, rex, contents + roff - 3);
1737 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
1741 bfd_put_8 (abfd, opcode, contents + roff - 2);
1745 irel->r_info = htab->r_info (r_symndx,
1746 r_type | R_X86_64_converted_reloc_bit);
1753 /* Look through the relocs for a section during the first phase, and
1754 calculate needed space in the global offset table, procedure
1755 linkage table, and dynamic reloc sections. */
1758 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1760 const Elf_Internal_Rela *relocs)
1762 struct elf_x86_link_hash_table *htab;
1763 Elf_Internal_Shdr *symtab_hdr;
1764 struct elf_link_hash_entry **sym_hashes;
1765 const Elf_Internal_Rela *rel;
1766 const Elf_Internal_Rela *rel_end;
1769 bfd_boolean converted;
1771 if (bfd_link_relocatable (info))
1774 /* Don't do anything special with non-loaded, non-alloced sections.
1775 In particular, any relocs in such sections should not affect GOT
1776 and PLT reference counting (ie. we don't allow them to create GOT
1777 or PLT entries), there's no possibility or desire to optimize TLS
1778 relocs, and there's not much point in propagating relocs to shared
1779 libs that the dynamic linker won't relocate. */
1780 if ((sec->flags & SEC_ALLOC) == 0)
1783 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1786 sec->check_relocs_failed = 1;
1790 BFD_ASSERT (is_x86_elf (abfd, htab));
1792 /* Get the section contents. */
1793 if (elf_section_data (sec)->this_hdr.contents != NULL)
1794 contents = elf_section_data (sec)->this_hdr.contents;
1795 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1797 sec->check_relocs_failed = 1;
1801 symtab_hdr = &elf_symtab_hdr (abfd);
1802 sym_hashes = elf_sym_hashes (abfd);
1808 rel_end = relocs + sec->reloc_count;
1809 for (rel = relocs; rel < rel_end; rel++)
1811 unsigned int r_type;
1812 unsigned int r_symndx;
1813 struct elf_link_hash_entry *h;
1814 struct elf_x86_link_hash_entry *eh;
1815 Elf_Internal_Sym *isym;
1817 bfd_boolean size_reloc;
1818 bfd_boolean converted_reloc;
1820 r_symndx = htab->r_sym (rel->r_info);
1821 r_type = ELF32_R_TYPE (rel->r_info);
1823 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1825 /* xgettext:c-format */
1826 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1831 if (r_symndx < symtab_hdr->sh_info)
1833 /* A local symbol. */
1834 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1839 /* Check relocation against local STT_GNU_IFUNC symbol. */
1840 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1842 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel,
1847 /* Fake a STT_GNU_IFUNC symbol. */
1848 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1850 h->type = STT_GNU_IFUNC;
1853 h->forced_local = 1;
1854 h->root.type = bfd_link_hash_defined;
1862 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1863 while (h->root.type == bfd_link_hash_indirect
1864 || h->root.type == bfd_link_hash_warning)
1865 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1868 /* Check invalid x32 relocations. */
1869 if (!ABI_64_P (abfd))
1875 case R_X86_64_DTPOFF64:
1876 case R_X86_64_TPOFF64:
1878 case R_X86_64_GOTOFF64:
1879 case R_X86_64_GOT64:
1880 case R_X86_64_GOTPCREL64:
1881 case R_X86_64_GOTPC64:
1882 case R_X86_64_GOTPLT64:
1883 case R_X86_64_PLTOFF64:
1886 name = h->root.root.string;
1888 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1891 /* xgettext:c-format */
1892 (_("%pB: relocation %s against symbol `%s' isn't "
1893 "supported in x32 mode"), abfd,
1894 x86_64_elf_howto_table[r_type].name, name);
1895 bfd_set_error (bfd_error_bad_value);
1903 /* It is referenced by a non-shared object. */
1906 if (h->type == STT_GNU_IFUNC)
1907 elf_tdata (info->output_bfd)->has_gnu_symbols
1908 |= elf_gnu_symbol_ifunc;
1911 converted_reloc = FALSE;
1912 if ((r_type == R_X86_64_GOTPCREL
1913 || r_type == R_X86_64_GOTPCRELX
1914 || r_type == R_X86_64_REX_GOTPCRELX)
1915 && (h == NULL || h->type != STT_GNU_IFUNC))
1917 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1918 if (!elf_x86_64_convert_load_reloc (abfd, contents, &r_type,
1919 irel, h, &converted_reloc,
1923 if (converted_reloc)
1927 if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
1928 symtab_hdr, sym_hashes,
1929 &r_type, GOT_UNKNOWN,
1930 rel, rel_end, h, r_symndx, FALSE))
1933 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1934 if (h == htab->elf.hgot)
1935 htab->got_referenced = TRUE;
1937 eh = (struct elf_x86_link_hash_entry *) h;
1940 case R_X86_64_TLSLD:
1941 htab->tls_ld_or_ldm_got.refcount = 1;
1944 case R_X86_64_TPOFF32:
1945 if (!bfd_link_executable (info) && ABI_64_P (abfd))
1946 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
1947 &x86_64_elf_howto_table[r_type]);
1949 eh->zero_undefweak &= 0x2;
1952 case R_X86_64_GOTTPOFF:
1953 if (!bfd_link_executable (info))
1954 info->flags |= DF_STATIC_TLS;
1957 case R_X86_64_GOT32:
1958 case R_X86_64_GOTPCREL:
1959 case R_X86_64_GOTPCRELX:
1960 case R_X86_64_REX_GOTPCRELX:
1961 case R_X86_64_TLSGD:
1962 case R_X86_64_GOT64:
1963 case R_X86_64_GOTPCREL64:
1964 case R_X86_64_GOTPLT64:
1965 case R_X86_64_GOTPC32_TLSDESC:
1966 case R_X86_64_TLSDESC_CALL:
1967 /* This symbol requires a global offset table entry. */
1969 int tls_type, old_tls_type;
1973 default: tls_type = GOT_NORMAL; break;
1974 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1975 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1976 case R_X86_64_GOTPC32_TLSDESC:
1977 case R_X86_64_TLSDESC_CALL:
1978 tls_type = GOT_TLS_GDESC; break;
1983 h->got.refcount = 1;
1984 old_tls_type = eh->tls_type;
1988 bfd_signed_vma *local_got_refcounts;
1990 /* This is a global offset table entry for a local symbol. */
1991 local_got_refcounts = elf_local_got_refcounts (abfd);
1992 if (local_got_refcounts == NULL)
1996 size = symtab_hdr->sh_info;
1997 size *= sizeof (bfd_signed_vma)
1998 + sizeof (bfd_vma) + sizeof (char);
1999 local_got_refcounts = ((bfd_signed_vma *)
2000 bfd_zalloc (abfd, size));
2001 if (local_got_refcounts == NULL)
2003 elf_local_got_refcounts (abfd) = local_got_refcounts;
2004 elf_x86_local_tlsdesc_gotent (abfd)
2005 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2006 elf_x86_local_got_tls_type (abfd)
2007 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2009 local_got_refcounts[r_symndx] = 1;
2011 = elf_x86_local_got_tls_type (abfd) [r_symndx];
2014 /* If a TLS symbol is accessed using IE at least once,
2015 there is no point to use dynamic model for it. */
2016 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2017 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2018 || tls_type != GOT_TLS_IE))
2020 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
2021 tls_type = old_tls_type;
2022 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2023 && GOT_TLS_GD_ANY_P (tls_type))
2024 tls_type |= old_tls_type;
2028 name = h->root.root.string;
2030 name = bfd_elf_sym_name (abfd, symtab_hdr,
2033 /* xgettext:c-format */
2034 (_("%pB: '%s' accessed both as normal and"
2035 " thread local symbol"),
2037 bfd_set_error (bfd_error_bad_value);
2042 if (old_tls_type != tls_type)
2045 eh->tls_type = tls_type;
2047 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
2052 case R_X86_64_GOTOFF64:
2053 case R_X86_64_GOTPC32:
2054 case R_X86_64_GOTPC64:
2057 eh->zero_undefweak &= 0x2;
2060 case R_X86_64_PLT32:
2061 case R_X86_64_PLT32_BND:
2062 /* This symbol requires a procedure linkage table entry. We
2063 actually build the entry in adjust_dynamic_symbol,
2064 because this might be a case of linking PIC code which is
2065 never referenced by a dynamic object, in which case we
2066 don't need to generate a procedure linkage table entry
2069 /* If this is a local symbol, we resolve it directly without
2070 creating a procedure linkage table entry. */
2074 eh->zero_undefweak &= 0x2;
2076 h->plt.refcount = 1;
2079 case R_X86_64_PLTOFF64:
2080 /* This tries to form the 'address' of a function relative
2081 to GOT. For global symbols we need a PLT entry. */
2085 h->plt.refcount = 1;
2089 case R_X86_64_SIZE32:
2090 case R_X86_64_SIZE64:
2095 if (!ABI_64_P (abfd))
2101 /* Check relocation overflow as these relocs may lead to
2102 run-time relocation overflow. Don't error out for
2103 sections we don't care about, such as debug sections or
2104 when relocation overflow check is disabled. */
2105 if (!info->no_reloc_overflow_check
2107 && (bfd_link_pic (info)
2108 || (bfd_link_executable (info)
2112 && (sec->flags & SEC_READONLY) == 0)))
2113 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2114 &x86_64_elf_howto_table[r_type]);
2120 case R_X86_64_PC32_BND:
2124 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2125 eh->zero_undefweak |= 0x2;
2126 /* We are called after all symbols have been resolved. Only
2127 relocation against STT_GNU_IFUNC symbol must go through
2130 && (bfd_link_executable (info)
2131 || h->type == STT_GNU_IFUNC))
2133 bfd_boolean func_pointer_ref = FALSE;
2135 if (r_type == R_X86_64_PC32)
2137 /* Since something like ".long foo - ." may be used
2138 as pointer, make sure that PLT is used if foo is
2139 a function defined in a shared library. */
2140 if ((sec->flags & SEC_CODE) == 0)
2142 h->pointer_equality_needed = 1;
2143 if (bfd_link_pie (info)
2144 && h->type == STT_FUNC
2149 h->plt.refcount = 1;
2153 else if (r_type != R_X86_64_PC32_BND
2154 && r_type != R_X86_64_PC64)
2156 h->pointer_equality_needed = 1;
2157 /* At run-time, R_X86_64_64 can be resolved for both
2158 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2159 can only be resolved for x32. */
2160 if ((sec->flags & SEC_READONLY) == 0
2161 && (r_type == R_X86_64_64
2162 || (!ABI_64_P (abfd)
2163 && (r_type == R_X86_64_32
2164 || r_type == R_X86_64_32S))))
2165 func_pointer_ref = TRUE;
2168 if (!func_pointer_ref)
2170 /* If this reloc is in a read-only section, we might
2171 need a copy reloc. We can't check reliably at this
2172 stage whether the section is read-only, as input
2173 sections have not yet been mapped to output sections.
2174 Tentatively set the flag for now, and correct in
2175 adjust_dynamic_symbol. */
2178 /* We may need a .plt entry if the symbol is a function
2179 defined in a shared lib or is a function referenced
2180 from the code or read-only section. */
2182 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2183 h->plt.refcount = 1;
2189 if (NEED_DYNAMIC_RELOCATION_P (info, TRUE, h, sec, r_type,
2190 htab->pointer_r_type))
2192 struct elf_dyn_relocs *p;
2193 struct elf_dyn_relocs **head;
2195 /* We must copy these reloc types into the output file.
2196 Create a reloc section in dynobj and make room for
2200 sreloc = _bfd_elf_make_dynamic_reloc_section
2201 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2202 abfd, /*rela?*/ TRUE);
2208 /* If this is a global symbol, we count the number of
2209 relocations we need for this symbol. */
2211 head = &eh->dyn_relocs;
2214 /* Track dynamic relocs needed for local syms too.
2215 We really need local syms available to do this
2220 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2225 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2229 /* Beware of type punned pointers vs strict aliasing
2231 vpp = &(elf_section_data (s)->local_dynrel);
2232 head = (struct elf_dyn_relocs **)vpp;
2236 if (p == NULL || p->sec != sec)
2238 bfd_size_type amt = sizeof *p;
2240 p = ((struct elf_dyn_relocs *)
2241 bfd_alloc (htab->elf.dynobj, amt));
2252 /* Count size relocation as PC-relative relocation. */
2253 if (X86_PCREL_TYPE_P (r_type) || size_reloc)
2258 /* This relocation describes the C++ object vtable hierarchy.
2259 Reconstruct it for later use during GC. */
2260 case R_X86_64_GNU_VTINHERIT:
2261 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2265 /* This relocation describes which C++ vtable entries are actually
2266 used. Record for later use during GC. */
2267 case R_X86_64_GNU_VTENTRY:
2268 BFD_ASSERT (h != NULL);
2270 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2279 if (elf_section_data (sec)->this_hdr.contents != contents)
2281 if (!converted && !info->keep_memory)
2285 /* Cache the section contents for elf_link_input_bfd if any
2286 load is converted or --no-keep-memory isn't used. */
2287 elf_section_data (sec)->this_hdr.contents = contents;
2291 /* Cache relocations if any load is converted. */
2292 if (elf_section_data (sec)->relocs != relocs && converted)
2293 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
2298 if (elf_section_data (sec)->this_hdr.contents != contents)
2300 sec->check_relocs_failed = 1;
2304 /* Return the relocation value for @tpoff relocation
2305 if STT_TLS virtual address is ADDRESS. */
2308 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2310 struct elf_link_hash_table *htab = elf_hash_table (info);
2311 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2312 bfd_vma static_tls_size;
2314 /* If tls_segment is NULL, we should have signalled an error already. */
2315 if (htab->tls_sec == NULL)
2318 /* Consider special static TLS alignment requirements. */
2319 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2320 return address - static_tls_size - htab->tls_sec->vma;
2323 /* Relocate an x86_64 ELF section. */
2326 elf_x86_64_relocate_section (bfd *output_bfd,
2327 struct bfd_link_info *info,
2329 asection *input_section,
2331 Elf_Internal_Rela *relocs,
2332 Elf_Internal_Sym *local_syms,
2333 asection **local_sections)
2335 struct elf_x86_link_hash_table *htab;
2336 Elf_Internal_Shdr *symtab_hdr;
2337 struct elf_link_hash_entry **sym_hashes;
2338 bfd_vma *local_got_offsets;
2339 bfd_vma *local_tlsdesc_gotents;
2340 Elf_Internal_Rela *rel;
2341 Elf_Internal_Rela *wrel;
2342 Elf_Internal_Rela *relend;
2343 unsigned int plt_entry_size;
2345 /* Skip if check_relocs failed. */
2346 if (input_section->check_relocs_failed)
2349 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
2353 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2355 plt_entry_size = htab->plt.plt_entry_size;
2356 symtab_hdr = &elf_symtab_hdr (input_bfd);
2357 sym_hashes = elf_sym_hashes (input_bfd);
2358 local_got_offsets = elf_local_got_offsets (input_bfd);
2359 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2361 _bfd_x86_elf_set_tls_module_base (info);
2363 rel = wrel = relocs;
2364 relend = relocs + input_section->reloc_count;
2365 for (; rel < relend; wrel++, rel++)
2367 unsigned int r_type, r_type_tls;
2368 reloc_howto_type *howto;
2369 unsigned long r_symndx;
2370 struct elf_link_hash_entry *h;
2371 struct elf_x86_link_hash_entry *eh;
2372 Elf_Internal_Sym *sym;
2374 bfd_vma off, offplt, plt_offset;
2376 bfd_boolean unresolved_reloc;
2377 bfd_reloc_status_type r;
2379 asection *base_got, *resolved_plt;
2381 bfd_boolean resolved_to_zero;
2382 bfd_boolean relative_reloc;
2383 bfd_boolean converted_reloc;
2384 bfd_boolean need_copy_reloc_in_pie;
2386 r_type = ELF32_R_TYPE (rel->r_info);
2387 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2388 || r_type == (int) R_X86_64_GNU_VTENTRY)
2395 converted_reloc = (r_type & R_X86_64_converted_reloc_bit) != 0;
2396 r_type &= ~R_X86_64_converted_reloc_bit;
2398 if (r_type >= (int) R_X86_64_standard)
2399 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2401 if (r_type != (int) R_X86_64_32
2402 || ABI_64_P (output_bfd))
2403 howto = x86_64_elf_howto_table + r_type;
2405 howto = (x86_64_elf_howto_table
2406 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
2407 r_symndx = htab->r_sym (rel->r_info);
2411 unresolved_reloc = FALSE;
2412 if (r_symndx < symtab_hdr->sh_info)
2414 sym = local_syms + r_symndx;
2415 sec = local_sections[r_symndx];
2417 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2419 st_size = sym->st_size;
2421 /* Relocate against local STT_GNU_IFUNC symbol. */
2422 if (!bfd_link_relocatable (info)
2423 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2425 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd,
2430 /* Set STT_GNU_IFUNC symbol value. */
2431 h->root.u.def.value = sym->st_value;
2432 h->root.u.def.section = sec;
2437 bfd_boolean warned ATTRIBUTE_UNUSED;
2438 bfd_boolean ignored ATTRIBUTE_UNUSED;
2440 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2441 r_symndx, symtab_hdr, sym_hashes,
2443 unresolved_reloc, warned, ignored);
2447 if (sec != NULL && discarded_section (sec))
2449 _bfd_clear_contents (howto, input_bfd, input_section,
2450 contents + rel->r_offset);
2451 wrel->r_offset = rel->r_offset;
2455 /* For ld -r, remove relocations in debug sections against
2456 sections defined in discarded sections. Not done for
2457 eh_frame editing code expects to be present. */
2458 if (bfd_link_relocatable (info)
2459 && (input_section->flags & SEC_DEBUGGING))
2465 if (bfd_link_relocatable (info))
2472 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
2474 if (r_type == R_X86_64_64)
2476 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
2477 zero-extend it to 64bit if addend is zero. */
2478 r_type = R_X86_64_32;
2479 memset (contents + rel->r_offset + 4, 0, 4);
2481 else if (r_type == R_X86_64_SIZE64)
2483 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
2484 zero-extend it to 64bit if addend is zero. */
2485 r_type = R_X86_64_SIZE32;
2486 memset (contents + rel->r_offset + 4, 0, 4);
2490 eh = (struct elf_x86_link_hash_entry *) h;
2492 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2493 it here if it is defined in a non-shared object. */
2495 && h->type == STT_GNU_IFUNC
2501 if ((input_section->flags & SEC_ALLOC) == 0)
2503 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2504 STT_GNU_IFUNC symbol as STT_FUNC. */
2505 if (elf_section_type (input_section) == SHT_NOTE)
2507 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2508 sections because such sections are not SEC_ALLOC and
2509 thus ld.so will not process them. */
2510 if ((input_section->flags & SEC_DEBUGGING) != 0)
2520 case R_X86_64_GOTPCREL:
2521 case R_X86_64_GOTPCRELX:
2522 case R_X86_64_REX_GOTPCRELX:
2523 case R_X86_64_GOTPCREL64:
2524 base_got = htab->elf.sgot;
2525 off = h->got.offset;
2527 if (base_got == NULL)
2530 if (off == (bfd_vma) -1)
2532 /* We can't use h->got.offset here to save state, or
2533 even just remember the offset, as finish_dynamic_symbol
2534 would use that as offset into .got. */
2536 if (h->plt.offset == (bfd_vma) -1)
2539 if (htab->elf.splt != NULL)
2541 plt_index = (h->plt.offset / plt_entry_size
2542 - htab->plt.has_plt0);
2543 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2544 base_got = htab->elf.sgotplt;
2548 plt_index = h->plt.offset / plt_entry_size;
2549 off = plt_index * GOT_ENTRY_SIZE;
2550 base_got = htab->elf.igotplt;
2553 if (h->dynindx == -1
2557 /* This references the local defitionion. We must
2558 initialize this entry in the global offset table.
2559 Since the offset must always be a multiple of 8,
2560 we use the least significant bit to record
2561 whether we have initialized it already.
2563 When doing a dynamic link, we create a .rela.got
2564 relocation entry to initialize the value. This
2565 is done in the finish_dynamic_symbol routine. */
2570 bfd_put_64 (output_bfd, relocation,
2571 base_got->contents + off);
2572 /* Note that this is harmless for the GOTPLT64
2573 case, as -1 | 1 still is -1. */
2579 relocation = (base_got->output_section->vma
2580 + base_got->output_offset + off);
2585 if (h->plt.offset == (bfd_vma) -1)
2587 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2588 if (r_type == htab->pointer_r_type
2589 && (input_section->flags & SEC_CODE) == 0)
2590 goto do_ifunc_pointer;
2591 goto bad_ifunc_reloc;
2594 /* STT_GNU_IFUNC symbol must go through PLT. */
2595 if (htab->elf.splt != NULL)
2597 if (htab->plt_second != NULL)
2599 resolved_plt = htab->plt_second;
2600 plt_offset = eh->plt_second.offset;
2604 resolved_plt = htab->elf.splt;
2605 plt_offset = h->plt.offset;
2610 resolved_plt = htab->elf.iplt;
2611 plt_offset = h->plt.offset;
2614 relocation = (resolved_plt->output_section->vma
2615 + resolved_plt->output_offset + plt_offset);
2621 if (h->root.root.string)
2622 name = h->root.root.string;
2624 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2627 /* xgettext:c-format */
2628 (_("%pB: relocation %s against STT_GNU_IFUNC "
2629 "symbol `%s' isn't supported"), input_bfd,
2631 bfd_set_error (bfd_error_bad_value);
2635 if (bfd_link_pic (info))
2640 if (ABI_64_P (output_bfd))
2645 if (rel->r_addend != 0)
2647 if (h->root.root.string)
2648 name = h->root.root.string;
2650 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
2653 /* xgettext:c-format */
2654 (_("%pB: relocation %s against STT_GNU_IFUNC "
2655 "symbol `%s' has non-zero addend: %" PRId64),
2656 input_bfd, howto->name, name, (int64_t) rel->r_addend);
2657 bfd_set_error (bfd_error_bad_value);
2661 /* Generate dynamic relcoation only when there is a
2662 non-GOT reference in a shared object or there is no
2664 if ((bfd_link_pic (info) && h->non_got_ref)
2665 || h->plt.offset == (bfd_vma) -1)
2667 Elf_Internal_Rela outrel;
2670 /* Need a dynamic relocation to get the real function
2672 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2676 if (outrel.r_offset == (bfd_vma) -1
2677 || outrel.r_offset == (bfd_vma) -2)
2680 outrel.r_offset += (input_section->output_section->vma
2681 + input_section->output_offset);
2683 if (POINTER_LOCAL_IFUNC_P (info, h))
2685 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2686 h->root.root.string,
2687 h->root.u.def.section->owner);
2689 /* This symbol is resolved locally. */
2690 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
2691 outrel.r_addend = (h->root.u.def.value
2692 + h->root.u.def.section->output_section->vma
2693 + h->root.u.def.section->output_offset);
2697 outrel.r_info = htab->r_info (h->dynindx, r_type);
2698 outrel.r_addend = 0;
2701 /* Dynamic relocations are stored in
2702 1. .rela.ifunc section in PIC object.
2703 2. .rela.got section in dynamic executable.
2704 3. .rela.iplt section in static executable. */
2705 if (bfd_link_pic (info))
2706 sreloc = htab->elf.irelifunc;
2707 else if (htab->elf.splt != NULL)
2708 sreloc = htab->elf.srelgot;
2710 sreloc = htab->elf.irelplt;
2711 elf_append_rela (output_bfd, sreloc, &outrel);
2713 /* If this reloc is against an external symbol, we
2714 do not want to fiddle with the addend. Otherwise,
2715 we need to include the symbol value so that it
2716 becomes an addend for the dynamic reloc. For an
2717 internal symbol, we have updated addend. */
2722 case R_X86_64_PC32_BND:
2724 case R_X86_64_PLT32:
2725 case R_X86_64_PLT32_BND:
2731 resolved_to_zero = (eh != NULL
2732 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2734 /* When generating a shared object, the relocations handled here are
2735 copied into the output file to be resolved at run time. */
2738 case R_X86_64_GOT32:
2739 case R_X86_64_GOT64:
2740 /* Relocation is to the entry for this symbol in the global
2742 case R_X86_64_GOTPCREL:
2743 case R_X86_64_GOTPCRELX:
2744 case R_X86_64_REX_GOTPCRELX:
2745 case R_X86_64_GOTPCREL64:
2746 /* Use global offset table entry as symbol value. */
2747 case R_X86_64_GOTPLT64:
2748 /* This is obsolete and treated the same as GOT64. */
2749 base_got = htab->elf.sgot;
2751 if (htab->elf.sgot == NULL)
2754 relative_reloc = FALSE;
2757 off = h->got.offset;
2759 && h->plt.offset != (bfd_vma)-1
2760 && off == (bfd_vma)-1)
2762 /* We can't use h->got.offset here to save
2763 state, or even just remember the offset, as
2764 finish_dynamic_symbol would use that as offset into
2766 bfd_vma plt_index = (h->plt.offset / plt_entry_size
2767 - htab->plt.has_plt0);
2768 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2769 base_got = htab->elf.sgotplt;
2772 if (RESOLVED_LOCALLY_P (info, h, htab))
2774 /* We must initialize this entry in the global offset
2775 table. Since the offset must always be a multiple
2776 of 8, we use the least significant bit to record
2777 whether we have initialized it already.
2779 When doing a dynamic link, we create a .rela.got
2780 relocation entry to initialize the value. This is
2781 done in the finish_dynamic_symbol routine. */
2786 bfd_put_64 (output_bfd, relocation,
2787 base_got->contents + off);
2788 /* Note that this is harmless for the GOTPLT64 case,
2789 as -1 | 1 still is -1. */
2792 if (GENERATE_RELATIVE_RELOC_P (info, h))
2794 /* If this symbol isn't dynamic in PIC,
2795 generate R_X86_64_RELATIVE here. */
2796 eh->no_finish_dynamic_symbol = 1;
2797 relative_reloc = TRUE;
2802 unresolved_reloc = FALSE;
2806 if (local_got_offsets == NULL)
2809 off = local_got_offsets[r_symndx];
2811 /* The offset must always be a multiple of 8. We use
2812 the least significant bit to record whether we have
2813 already generated the necessary reloc. */
2818 bfd_put_64 (output_bfd, relocation,
2819 base_got->contents + off);
2820 local_got_offsets[r_symndx] |= 1;
2822 if (bfd_link_pic (info))
2823 relative_reloc = TRUE;
2830 Elf_Internal_Rela outrel;
2832 /* We need to generate a R_X86_64_RELATIVE reloc
2833 for the dynamic linker. */
2834 s = htab->elf.srelgot;
2838 outrel.r_offset = (base_got->output_section->vma
2839 + base_got->output_offset
2841 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
2842 outrel.r_addend = relocation;
2843 elf_append_rela (output_bfd, s, &outrel);
2846 if (off >= (bfd_vma) -2)
2849 relocation = base_got->output_section->vma
2850 + base_got->output_offset + off;
2851 if (r_type != R_X86_64_GOTPCREL
2852 && r_type != R_X86_64_GOTPCRELX
2853 && r_type != R_X86_64_REX_GOTPCRELX
2854 && r_type != R_X86_64_GOTPCREL64)
2855 relocation -= htab->elf.sgotplt->output_section->vma
2856 - htab->elf.sgotplt->output_offset;
2860 case R_X86_64_GOTOFF64:
2861 /* Relocation is relative to the start of the global offset
2864 /* Check to make sure it isn't a protected function or data
2865 symbol for shared library since it may not be local when
2866 used as function address or with copy relocation. We also
2867 need to make sure that a symbol is referenced locally. */
2868 if (bfd_link_pic (info) && h)
2870 if (!h->def_regular)
2874 switch (ELF_ST_VISIBILITY (h->other))
2877 v = _("hidden symbol");
2880 v = _("internal symbol");
2883 v = _("protected symbol");
2891 /* xgettext:c-format */
2892 (_("%pB: relocation R_X86_64_GOTOFF64 against undefined %s"
2893 " `%s' can not be used when making a shared object"),
2894 input_bfd, v, h->root.root.string);
2895 bfd_set_error (bfd_error_bad_value);
2898 else if (!bfd_link_executable (info)
2899 && !SYMBOL_REFERENCES_LOCAL_P (info, h)
2900 && (h->type == STT_FUNC
2901 || h->type == STT_OBJECT)
2902 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2905 /* xgettext:c-format */
2906 (_("%pB: relocation R_X86_64_GOTOFF64 against protected %s"
2907 " `%s' can not be used when making a shared object"),
2909 h->type == STT_FUNC ? "function" : "data",
2910 h->root.root.string);
2911 bfd_set_error (bfd_error_bad_value);
2916 /* Note that sgot is not involved in this
2917 calculation. We always want the start of .got.plt. If we
2918 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2919 permitted by the ABI, we might have to change this
2921 relocation -= htab->elf.sgotplt->output_section->vma
2922 + htab->elf.sgotplt->output_offset;
2925 case R_X86_64_GOTPC32:
2926 case R_X86_64_GOTPC64:
2927 /* Use global offset table as symbol value. */
2928 relocation = htab->elf.sgotplt->output_section->vma
2929 + htab->elf.sgotplt->output_offset;
2930 unresolved_reloc = FALSE;
2933 case R_X86_64_PLTOFF64:
2934 /* Relocation is PLT entry relative to GOT. For local
2935 symbols it's the symbol itself relative to GOT. */
2937 /* See PLT32 handling. */
2938 && (h->plt.offset != (bfd_vma) -1
2939 || eh->plt_got.offset != (bfd_vma) -1)
2940 && htab->elf.splt != NULL)
2942 if (eh->plt_got.offset != (bfd_vma) -1)
2944 /* Use the GOT PLT. */
2945 resolved_plt = htab->plt_got;
2946 plt_offset = eh->plt_got.offset;
2948 else if (htab->plt_second != NULL)
2950 resolved_plt = htab->plt_second;
2951 plt_offset = eh->plt_second.offset;
2955 resolved_plt = htab->elf.splt;
2956 plt_offset = h->plt.offset;
2959 relocation = (resolved_plt->output_section->vma
2960 + resolved_plt->output_offset
2962 unresolved_reloc = FALSE;
2965 relocation -= htab->elf.sgotplt->output_section->vma
2966 + htab->elf.sgotplt->output_offset;
2969 case R_X86_64_PLT32:
2970 case R_X86_64_PLT32_BND:
2971 /* Relocation is to the entry for this symbol in the
2972 procedure linkage table. */
2974 /* Resolve a PLT32 reloc against a local symbol directly,
2975 without using the procedure linkage table. */
2979 if ((h->plt.offset == (bfd_vma) -1
2980 && eh->plt_got.offset == (bfd_vma) -1)
2981 || htab->elf.splt == NULL)
2983 /* We didn't make a PLT entry for this symbol. This
2984 happens when statically linking PIC code, or when
2985 using -Bsymbolic. */
2990 if (h->plt.offset != (bfd_vma) -1)
2992 if (htab->plt_second != NULL)
2994 resolved_plt = htab->plt_second;
2995 plt_offset = eh->plt_second.offset;
2999 resolved_plt = htab->elf.splt;
3000 plt_offset = h->plt.offset;
3005 /* Use the GOT PLT. */
3006 resolved_plt = htab->plt_got;
3007 plt_offset = eh->plt_got.offset;
3010 relocation = (resolved_plt->output_section->vma
3011 + resolved_plt->output_offset
3013 unresolved_reloc = FALSE;
3016 case R_X86_64_SIZE32:
3017 case R_X86_64_SIZE64:
3018 /* Set to symbol size. */
3019 relocation = st_size;
3025 case R_X86_64_PC32_BND:
3026 /* Don't complain about -fPIC if the symbol is undefined when
3027 building executable unless it is unresolved weak symbol,
3028 references a dynamic definition in PIE or -z nocopyreloc
3030 if ((input_section->flags & SEC_ALLOC) != 0
3031 && (input_section->flags & SEC_READONLY) != 0
3033 && ((bfd_link_executable (info)
3034 && ((h->root.type == bfd_link_hash_undefweak
3035 && !resolved_to_zero)
3036 || (bfd_link_pie (info)
3039 || ((info->nocopyreloc
3040 || (eh->def_protected
3041 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
3043 && !(h->root.u.def.section->flags & SEC_CODE))))
3044 || bfd_link_dll (info)))
3046 bfd_boolean fail = FALSE;
3047 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3049 /* Symbol is referenced locally. Make sure it is
3051 fail = !(h->def_regular || ELF_COMMON_DEF_P (h));
3053 else if (!(bfd_link_pie (info)
3054 && (h->needs_copy || eh->needs_copy)))
3056 /* Symbol doesn't need copy reloc and isn't referenced
3057 locally. Address of protected function may not be
3058 reachable at run-time. */
3059 fail = (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3060 || (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED
3061 && h->type == STT_FUNC));
3065 return elf_x86_64_need_pic (info, input_bfd, input_section,
3066 h, NULL, NULL, howto);
3068 /* Since x86-64 has PC-relative PLT, we can use PLT in PIE
3069 as function address. */
3071 && (input_section->flags & SEC_CODE) == 0
3072 && bfd_link_pie (info)
3073 && h->type == STT_FUNC
3084 /* FIXME: The ABI says the linker should make sure the value is
3085 the same when it's zeroextended to 64 bit. */
3088 if ((input_section->flags & SEC_ALLOC) == 0)
3091 need_copy_reloc_in_pie = (bfd_link_pie (info)
3096 == bfd_link_hash_undefined))
3097 && (X86_PCREL_TYPE_P (r_type)
3098 || X86_SIZE_TYPE_P (r_type)));
3100 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
3101 need_copy_reloc_in_pie,
3102 resolved_to_zero, FALSE))
3104 Elf_Internal_Rela outrel;
3105 bfd_boolean skip, relocate;
3108 /* When generating a shared object, these relocations
3109 are copied into the output file to be resolved at run
3115 _bfd_elf_section_offset (output_bfd, info, input_section,
3117 if (outrel.r_offset == (bfd_vma) -1)
3119 else if (outrel.r_offset == (bfd_vma) -2)
3120 skip = TRUE, relocate = TRUE;
3122 outrel.r_offset += (input_section->output_section->vma
3123 + input_section->output_offset);
3126 memset (&outrel, 0, sizeof outrel);
3128 else if (COPY_INPUT_RELOC_P (info, h, r_type))
3130 outrel.r_info = htab->r_info (h->dynindx, r_type);
3131 outrel.r_addend = rel->r_addend;
3135 /* This symbol is local, or marked to become local.
3136 When relocation overflow check is disabled, we
3137 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
3138 if (r_type == htab->pointer_r_type
3139 || (r_type == R_X86_64_32
3140 && info->no_reloc_overflow_check))
3143 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3144 outrel.r_addend = relocation + rel->r_addend;
3146 else if (r_type == R_X86_64_64
3147 && !ABI_64_P (output_bfd))
3150 outrel.r_info = htab->r_info (0,
3151 R_X86_64_RELATIVE64);
3152 outrel.r_addend = relocation + rel->r_addend;
3153 /* Check addend overflow. */
3154 if ((outrel.r_addend & 0x80000000)
3155 != (rel->r_addend & 0x80000000))
3158 int addend = rel->r_addend;
3159 if (h && h->root.root.string)
3160 name = h->root.root.string;
3162 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3165 /* xgettext:c-format */
3166 (_("%pB: addend %s%#x in relocation %s against "
3167 "symbol `%s' at %#" PRIx64
3168 " in section `%pA' is out of range"),
3169 input_bfd, addend < 0 ? "-" : "", addend,
3170 howto->name, name, (uint64_t) rel->r_offset,
3172 bfd_set_error (bfd_error_bad_value);
3180 if (bfd_is_abs_section (sec))
3182 else if (sec == NULL || sec->owner == NULL)
3184 bfd_set_error (bfd_error_bad_value);
3191 /* We are turning this relocation into one
3192 against a section symbol. It would be
3193 proper to subtract the symbol's value,
3194 osec->vma, from the emitted reloc addend,
3195 but ld.so expects buggy relocs. */
3196 osec = sec->output_section;
3197 sindx = elf_section_data (osec)->dynindx;
3200 asection *oi = htab->elf.text_index_section;
3201 sindx = elf_section_data (oi)->dynindx;
3203 BFD_ASSERT (sindx != 0);
3206 outrel.r_info = htab->r_info (sindx, r_type);
3207 outrel.r_addend = relocation + rel->r_addend;
3211 sreloc = elf_section_data (input_section)->sreloc;
3213 if (sreloc == NULL || sreloc->contents == NULL)
3215 r = bfd_reloc_notsupported;
3216 goto check_relocation_error;
3219 elf_append_rela (output_bfd, sreloc, &outrel);
3221 /* If this reloc is against an external symbol, we do
3222 not want to fiddle with the addend. Otherwise, we
3223 need to include the symbol value so that it becomes
3224 an addend for the dynamic reloc. */
3231 case R_X86_64_TLSGD:
3232 case R_X86_64_GOTPC32_TLSDESC:
3233 case R_X86_64_TLSDESC_CALL:
3234 case R_X86_64_GOTTPOFF:
3235 tls_type = GOT_UNKNOWN;
3236 if (h == NULL && local_got_offsets)
3237 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
3239 tls_type = elf_x86_hash_entry (h)->tls_type;
3241 r_type_tls = r_type;
3242 if (! elf_x86_64_tls_transition (info, input_bfd,
3243 input_section, contents,
3244 symtab_hdr, sym_hashes,
3245 &r_type_tls, tls_type, rel,
3246 relend, h, r_symndx, TRUE))
3249 if (r_type_tls == R_X86_64_TPOFF32)
3251 bfd_vma roff = rel->r_offset;
3253 BFD_ASSERT (! unresolved_reloc);
3255 if (r_type == R_X86_64_TLSGD)
3257 /* GD->LE transition. For 64bit, change
3258 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3259 .word 0x6666; rex64; call __tls_get_addr@PLT
3261 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3263 call *__tls_get_addr@GOTPCREL(%rip)
3264 which may be converted to
3265 addr32 call __tls_get_addr
3268 leaq foo@tpoff(%rax), %rax
3270 leaq foo@tlsgd(%rip), %rdi
3271 .word 0x6666; rex64; call __tls_get_addr@PLT
3273 leaq foo@tlsgd(%rip), %rdi
3275 call *__tls_get_addr@GOTPCREL(%rip)
3276 which may be converted to
3277 addr32 call __tls_get_addr
3280 leaq foo@tpoff(%rax), %rax
3281 For largepic, change:
3282 leaq foo@tlsgd(%rip), %rdi
3283 movabsq $__tls_get_addr@pltoff, %rax
3288 leaq foo@tpoff(%rax), %rax
3289 nopw 0x0(%rax,%rax,1) */
3291 if (ABI_64_P (output_bfd))
3293 if (contents[roff + 5] == 0xb8)
3295 memcpy (contents + roff - 3,
3296 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
3297 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3301 memcpy (contents + roff - 4,
3302 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3306 memcpy (contents + roff - 3,
3307 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3309 bfd_put_32 (output_bfd,
3310 elf_x86_64_tpoff (info, relocation),
3311 contents + roff + 8 + largepic);
3312 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
3313 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
3318 else if (r_type == R_X86_64_GOTPC32_TLSDESC)
3320 /* GDesc -> LE transition.
3321 It's originally something like:
3322 leaq x@tlsdesc(%rip), %rax
3325 movl $x@tpoff, %rax. */
3327 unsigned int val, type;
3329 type = bfd_get_8 (input_bfd, contents + roff - 3);
3330 val = bfd_get_8 (input_bfd, contents + roff - 1);
3331 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3332 contents + roff - 3);
3333 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3334 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3335 contents + roff - 1);
3336 bfd_put_32 (output_bfd,
3337 elf_x86_64_tpoff (info, relocation),
3341 else if (r_type == R_X86_64_TLSDESC_CALL)
3343 /* GDesc -> LE transition.
3348 bfd_put_8 (output_bfd, 0x66, contents + roff);
3349 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3352 else if (r_type == R_X86_64_GOTTPOFF)
3354 /* IE->LE transition:
3355 For 64bit, originally it can be one of:
3356 movq foo@gottpoff(%rip), %reg
3357 addq foo@gottpoff(%rip), %reg
3360 leaq foo(%reg), %reg
3362 For 32bit, originally it can be one of:
3363 movq foo@gottpoff(%rip), %reg
3364 addl foo@gottpoff(%rip), %reg
3367 leal foo(%reg), %reg
3370 unsigned int val, type, reg;
3373 val = bfd_get_8 (input_bfd, contents + roff - 3);
3376 type = bfd_get_8 (input_bfd, contents + roff - 2);
3377 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3383 bfd_put_8 (output_bfd, 0x49,
3384 contents + roff - 3);
3385 else if (!ABI_64_P (output_bfd) && val == 0x44)
3386 bfd_put_8 (output_bfd, 0x41,
3387 contents + roff - 3);
3388 bfd_put_8 (output_bfd, 0xc7,
3389 contents + roff - 2);
3390 bfd_put_8 (output_bfd, 0xc0 | reg,
3391 contents + roff - 1);
3395 /* addq/addl -> addq/addl - addressing with %rsp/%r12
3398 bfd_put_8 (output_bfd, 0x49,
3399 contents + roff - 3);
3400 else if (!ABI_64_P (output_bfd) && val == 0x44)
3401 bfd_put_8 (output_bfd, 0x41,
3402 contents + roff - 3);
3403 bfd_put_8 (output_bfd, 0x81,
3404 contents + roff - 2);
3405 bfd_put_8 (output_bfd, 0xc0 | reg,
3406 contents + roff - 1);
3410 /* addq/addl -> leaq/leal */
3412 bfd_put_8 (output_bfd, 0x4d,
3413 contents + roff - 3);
3414 else if (!ABI_64_P (output_bfd) && val == 0x44)
3415 bfd_put_8 (output_bfd, 0x45,
3416 contents + roff - 3);
3417 bfd_put_8 (output_bfd, 0x8d,
3418 contents + roff - 2);
3419 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3420 contents + roff - 1);
3422 bfd_put_32 (output_bfd,
3423 elf_x86_64_tpoff (info, relocation),
3431 if (htab->elf.sgot == NULL)
3436 off = h->got.offset;
3437 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3441 if (local_got_offsets == NULL)
3444 off = local_got_offsets[r_symndx];
3445 offplt = local_tlsdesc_gotents[r_symndx];
3452 Elf_Internal_Rela outrel;
3456 if (htab->elf.srelgot == NULL)
3459 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3461 if (GOT_TLS_GDESC_P (tls_type))
3463 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
3464 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3465 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3466 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3467 + htab->elf.sgotplt->output_offset
3469 + htab->sgotplt_jump_table_size);
3470 sreloc = htab->elf.srelplt;
3472 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
3474 outrel.r_addend = 0;
3475 elf_append_rela (output_bfd, sreloc, &outrel);
3478 sreloc = htab->elf.srelgot;
3480 outrel.r_offset = (htab->elf.sgot->output_section->vma
3481 + htab->elf.sgot->output_offset + off);
3483 if (GOT_TLS_GD_P (tls_type))
3484 dr_type = R_X86_64_DTPMOD64;
3485 else if (GOT_TLS_GDESC_P (tls_type))
3488 dr_type = R_X86_64_TPOFF64;
3490 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3491 outrel.r_addend = 0;
3492 if ((dr_type == R_X86_64_TPOFF64
3493 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3494 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
3495 outrel.r_info = htab->r_info (indx, dr_type);
3497 elf_append_rela (output_bfd, sreloc, &outrel);
3499 if (GOT_TLS_GD_P (tls_type))
3503 BFD_ASSERT (! unresolved_reloc);
3504 bfd_put_64 (output_bfd,
3505 relocation - _bfd_x86_elf_dtpoff_base (info),
3506 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3510 bfd_put_64 (output_bfd, 0,
3511 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3512 outrel.r_info = htab->r_info (indx,
3514 outrel.r_offset += GOT_ENTRY_SIZE;
3515 elf_append_rela (output_bfd, sreloc,
3524 local_got_offsets[r_symndx] |= 1;
3527 if (off >= (bfd_vma) -2
3528 && ! GOT_TLS_GDESC_P (tls_type))
3530 if (r_type_tls == r_type)
3532 if (r_type == R_X86_64_GOTPC32_TLSDESC
3533 || r_type == R_X86_64_TLSDESC_CALL)
3534 relocation = htab->elf.sgotplt->output_section->vma
3535 + htab->elf.sgotplt->output_offset
3536 + offplt + htab->sgotplt_jump_table_size;
3538 relocation = htab->elf.sgot->output_section->vma
3539 + htab->elf.sgot->output_offset + off;
3540 unresolved_reloc = FALSE;
3544 bfd_vma roff = rel->r_offset;
3546 if (r_type == R_X86_64_TLSGD)
3548 /* GD->IE transition. For 64bit, change
3549 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3550 .word 0x6666; rex64; call __tls_get_addr@PLT
3552 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3554 call *__tls_get_addr@GOTPCREL(%rip
3555 which may be converted to
3556 addr32 call __tls_get_addr
3559 addq foo@gottpoff(%rip), %rax
3561 leaq foo@tlsgd(%rip), %rdi
3562 .word 0x6666; rex64; call __tls_get_addr@PLT
3564 leaq foo@tlsgd(%rip), %rdi
3566 call *__tls_get_addr@GOTPCREL(%rip)
3567 which may be converted to
3568 addr32 call __tls_get_addr
3571 addq foo@gottpoff(%rip), %rax
3572 For largepic, change:
3573 leaq foo@tlsgd(%rip), %rdi
3574 movabsq $__tls_get_addr@pltoff, %rax
3579 addq foo@gottpoff(%rax), %rax
3580 nopw 0x0(%rax,%rax,1) */
3582 if (ABI_64_P (output_bfd))
3584 if (contents[roff + 5] == 0xb8)
3586 memcpy (contents + roff - 3,
3587 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
3588 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3592 memcpy (contents + roff - 4,
3593 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3597 memcpy (contents + roff - 3,
3598 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3601 relocation = (htab->elf.sgot->output_section->vma
3602 + htab->elf.sgot->output_offset + off
3605 - input_section->output_section->vma
3606 - input_section->output_offset
3608 bfd_put_32 (output_bfd, relocation,
3609 contents + roff + 8 + largepic);
3610 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
3615 else if (r_type == R_X86_64_GOTPC32_TLSDESC)
3617 /* GDesc -> IE transition.
3618 It's originally something like:
3619 leaq x@tlsdesc(%rip), %rax
3622 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3624 /* Now modify the instruction as appropriate. To
3625 turn a leaq into a movq in the form we use it, it
3626 suffices to change the second byte from 0x8d to
3628 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3630 bfd_put_32 (output_bfd,
3631 htab->elf.sgot->output_section->vma
3632 + htab->elf.sgot->output_offset + off
3634 - input_section->output_section->vma
3635 - input_section->output_offset
3640 else if (r_type == R_X86_64_TLSDESC_CALL)
3642 /* GDesc -> IE transition.
3649 bfd_put_8 (output_bfd, 0x66, contents + roff);
3650 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3658 case R_X86_64_TLSLD:
3659 if (! elf_x86_64_tls_transition (info, input_bfd,
3660 input_section, contents,
3661 symtab_hdr, sym_hashes,
3662 &r_type, GOT_UNKNOWN, rel,
3663 relend, h, r_symndx, TRUE))
3666 if (r_type != R_X86_64_TLSLD)
3668 /* LD->LE transition:
3669 leaq foo@tlsld(%rip), %rdi
3670 call __tls_get_addr@PLT
3671 For 64bit, we change it into:
3672 .word 0x6666; .byte 0x66; movq %fs:0, %rax
3673 For 32bit, we change it into:
3674 nopl 0x0(%rax); movl %fs:0, %eax
3676 leaq foo@tlsld(%rip), %rdi;
3677 call *__tls_get_addr@GOTPCREL(%rip)
3678 which may be converted to
3679 addr32 call __tls_get_addr
3680 For 64bit, we change it into:
3681 .word 0x6666; .word 0x6666; movq %fs:0, %rax
3682 For 32bit, we change it into:
3683 nopw 0x0(%rax); movl %fs:0, %eax
3684 For largepic, change:
3685 leaq foo@tlsgd(%rip), %rdi
3686 movabsq $__tls_get_addr@pltoff, %rax
3690 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
3693 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3694 if (ABI_64_P (output_bfd))
3696 if (contents[rel->r_offset + 5] == 0xb8)
3697 memcpy (contents + rel->r_offset - 3,
3698 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
3699 "\x64\x48\x8b\x04\x25\0\0\0", 22);
3700 else if (contents[rel->r_offset + 4] == 0xff
3701 || contents[rel->r_offset + 4] == 0x67)
3702 memcpy (contents + rel->r_offset - 3,
3703 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
3706 memcpy (contents + rel->r_offset - 3,
3707 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3711 if (contents[rel->r_offset + 4] == 0xff)
3712 memcpy (contents + rel->r_offset - 3,
3713 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
3716 memcpy (contents + rel->r_offset - 3,
3717 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
3719 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
3720 and R_X86_64_PLTOFF64. */
3726 if (htab->elf.sgot == NULL)
3729 off = htab->tls_ld_or_ldm_got.offset;
3734 Elf_Internal_Rela outrel;
3736 if (htab->elf.srelgot == NULL)
3739 outrel.r_offset = (htab->elf.sgot->output_section->vma
3740 + htab->elf.sgot->output_offset + off);
3742 bfd_put_64 (output_bfd, 0,
3743 htab->elf.sgot->contents + off);
3744 bfd_put_64 (output_bfd, 0,
3745 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3746 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
3747 outrel.r_addend = 0;
3748 elf_append_rela (output_bfd, htab->elf.srelgot,
3750 htab->tls_ld_or_ldm_got.offset |= 1;
3752 relocation = htab->elf.sgot->output_section->vma
3753 + htab->elf.sgot->output_offset + off;
3754 unresolved_reloc = FALSE;
3757 case R_X86_64_DTPOFF32:
3758 if (!bfd_link_executable (info)
3759 || (input_section->flags & SEC_CODE) == 0)
3760 relocation -= _bfd_x86_elf_dtpoff_base (info);
3762 relocation = elf_x86_64_tpoff (info, relocation);
3765 case R_X86_64_TPOFF32:
3766 case R_X86_64_TPOFF64:
3767 BFD_ASSERT (bfd_link_executable (info));
3768 relocation = elf_x86_64_tpoff (info, relocation);
3771 case R_X86_64_DTPOFF64:
3772 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
3773 relocation -= _bfd_x86_elf_dtpoff_base (info);
3780 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3781 because such sections are not SEC_ALLOC and thus ld.so will
3782 not process them. */
3783 if (unresolved_reloc
3784 && !((input_section->flags & SEC_DEBUGGING) != 0
3786 && _bfd_elf_section_offset (output_bfd, info, input_section,
3787 rel->r_offset) != (bfd_vma) -1)
3792 sec = h->root.u.def.section;
3793 if ((info->nocopyreloc
3794 || (eh->def_protected
3795 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
3796 && !(h->root.u.def.section->flags & SEC_CODE))
3797 return elf_x86_64_need_pic (info, input_bfd, input_section,
3798 h, NULL, NULL, howto);
3803 /* xgettext:c-format */
3804 (_("%pB(%pA+%#" PRIx64 "): "
3805 "unresolvable %s relocation against symbol `%s'"),
3808 (uint64_t) rel->r_offset,
3810 h->root.root.string);
3816 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3817 contents, rel->r_offset,
3818 relocation, rel->r_addend);
3820 check_relocation_error:
3821 if (r != bfd_reloc_ok)
3826 name = h->root.root.string;
3829 name = bfd_elf_string_from_elf_section (input_bfd,
3830 symtab_hdr->sh_link,
3835 name = bfd_section_name (input_bfd, sec);
3838 if (r == bfd_reloc_overflow)
3840 if (converted_reloc)
3842 info->callbacks->einfo
3843 (_("%F%P: failed to convert GOTPCREL relocation; relink with --no-relax\n"));
3846 (*info->callbacks->reloc_overflow)
3847 (info, (h ? &h->root : NULL), name, howto->name,
3848 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3853 /* xgettext:c-format */
3854 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3855 input_bfd, input_section,
3856 (uint64_t) rel->r_offset, name, (int) r);
3867 Elf_Internal_Shdr *rel_hdr;
3868 size_t deleted = rel - wrel;
3870 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3871 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3872 if (rel_hdr->sh_size == 0)
3874 /* It is too late to remove an empty reloc section. Leave
3876 ??? What is wrong with an empty section??? */
3877 rel_hdr->sh_size = rel_hdr->sh_entsize;
3880 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3881 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3882 input_section->reloc_count -= deleted;
3888 /* Finish up dynamic symbol handling. We set the contents of various
3889 dynamic sections here. */
3892 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3893 struct bfd_link_info *info,
3894 struct elf_link_hash_entry *h,
3895 Elf_Internal_Sym *sym)
3897 struct elf_x86_link_hash_table *htab;
3898 bfd_boolean use_plt_second;
3899 struct elf_x86_link_hash_entry *eh;
3900 bfd_boolean local_undefweak;
3902 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
3906 /* Use the second PLT section only if there is .plt section. */
3907 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3909 eh = (struct elf_x86_link_hash_entry *) h;
3910 if (eh->no_finish_dynamic_symbol)
3913 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3914 resolved undefined weak symbols in executable so that their
3915 references have value 0 at run-time. */
3916 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3918 if (h->plt.offset != (bfd_vma) -1)
3921 bfd_vma got_offset, plt_offset;
3922 Elf_Internal_Rela rela;
3924 asection *plt, *gotplt, *relplt, *resolved_plt;
3925 const struct elf_backend_data *bed;
3926 bfd_vma plt_got_pcrel_offset;
3928 /* When building a static executable, use .iplt, .igot.plt and
3929 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3930 if (htab->elf.splt != NULL)
3932 plt = htab->elf.splt;
3933 gotplt = htab->elf.sgotplt;
3934 relplt = htab->elf.srelplt;
3938 plt = htab->elf.iplt;
3939 gotplt = htab->elf.igotplt;
3940 relplt = htab->elf.irelplt;
3943 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3945 /* Get the index in the procedure linkage table which
3946 corresponds to this symbol. This is the index of this symbol
3947 in all the symbols for which we are making plt entries. The
3948 first entry in the procedure linkage table is reserved.
3950 Get the offset into the .got table of the entry that
3951 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3952 bytes. The first three are reserved for the dynamic linker.
3954 For static executables, we don't reserve anything. */
3956 if (plt == htab->elf.splt)
3958 got_offset = (h->plt.offset / htab->plt.plt_entry_size
3959 - htab->plt.has_plt0);
3960 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
3964 got_offset = h->plt.offset / htab->plt.plt_entry_size;
3965 got_offset = got_offset * GOT_ENTRY_SIZE;
3968 /* Fill in the entry in the procedure linkage table. */
3969 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3970 htab->plt.plt_entry_size);
3973 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3974 htab->non_lazy_plt->plt_entry,
3975 htab->non_lazy_plt->plt_entry_size);
3977 resolved_plt = htab->plt_second;
3978 plt_offset = eh->plt_second.offset;
3983 plt_offset = h->plt.offset;
3986 /* Insert the relocation positions of the plt section. */
3988 /* Put offset the PC-relative instruction referring to the GOT entry,
3989 subtracting the size of that instruction. */
3990 plt_got_pcrel_offset = (gotplt->output_section->vma
3991 + gotplt->output_offset
3993 - resolved_plt->output_section->vma
3994 - resolved_plt->output_offset
3996 - htab->plt.plt_got_insn_size);
3998 /* Check PC-relative offset overflow in PLT entry. */
3999 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
4000 /* xgettext:c-format */
4001 info->callbacks->einfo (_("%F%pB: PC-relative offset overflow in PLT entry for `%s'\n"),
4002 output_bfd, h->root.root.string);
4004 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
4005 (resolved_plt->contents + plt_offset
4006 + htab->plt.plt_got_offset));
4008 /* Fill in the entry in the global offset table, initially this
4009 points to the second part of the PLT entry. Leave the entry
4010 as zero for undefined weak symbol in PIE. No PLT relocation
4011 against undefined weak symbol in PIE. */
4012 if (!local_undefweak)
4014 if (htab->plt.has_plt0)
4015 bfd_put_64 (output_bfd, (plt->output_section->vma
4016 + plt->output_offset
4018 + htab->lazy_plt->plt_lazy_offset),
4019 gotplt->contents + got_offset);
4021 /* Fill in the entry in the .rela.plt section. */
4022 rela.r_offset = (gotplt->output_section->vma
4023 + gotplt->output_offset
4025 if (PLT_LOCAL_IFUNC_P (info, h))
4027 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
4028 h->root.root.string,
4029 h->root.u.def.section->owner);
4031 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4032 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4033 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4034 rela.r_addend = (h->root.u.def.value
4035 + h->root.u.def.section->output_section->vma
4036 + h->root.u.def.section->output_offset);
4037 /* R_X86_64_IRELATIVE comes last. */
4038 plt_index = htab->next_irelative_index--;
4042 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
4044 plt_index = htab->next_jump_slot_index++;
4047 /* Don't fill the second and third slots in PLT entry for
4048 static executables nor without PLT0. */
4049 if (plt == htab->elf.splt && htab->plt.has_plt0)
4052 = h->plt.offset + htab->lazy_plt->plt_plt_insn_end;
4054 /* Put relocation index. */
4055 bfd_put_32 (output_bfd, plt_index,
4056 (plt->contents + h->plt.offset
4057 + htab->lazy_plt->plt_reloc_offset));
4059 /* Put offset for jmp .PLT0 and check for overflow. We don't
4060 check relocation index for overflow since branch displacement
4061 will overflow first. */
4062 if (plt0_offset > 0x80000000)
4063 /* xgettext:c-format */
4064 info->callbacks->einfo (_("%F%pB: branch displacement overflow in PLT entry for `%s'\n"),
4065 output_bfd, h->root.root.string);
4066 bfd_put_32 (output_bfd, - plt0_offset,
4067 (plt->contents + h->plt.offset
4068 + htab->lazy_plt->plt_plt_offset));
4071 bed = get_elf_backend_data (output_bfd);
4072 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
4073 bed->s->swap_reloca_out (output_bfd, &rela, loc);
4076 else if (eh->plt_got.offset != (bfd_vma) -1)
4078 bfd_vma got_offset, plt_offset;
4079 asection *plt, *got;
4080 bfd_boolean got_after_plt;
4081 int32_t got_pcrel_offset;
4083 /* Set the entry in the GOT procedure linkage table. */
4084 plt = htab->plt_got;
4085 got = htab->elf.sgot;
4086 got_offset = h->got.offset;
4088 if (got_offset == (bfd_vma) -1
4089 || (h->type == STT_GNU_IFUNC && h->def_regular)
4094 /* Use the non-lazy PLT entry template for the GOT PLT since they
4095 are the identical. */
4096 /* Fill in the entry in the GOT procedure linkage table. */
4097 plt_offset = eh->plt_got.offset;
4098 memcpy (plt->contents + plt_offset,
4099 htab->non_lazy_plt->plt_entry,
4100 htab->non_lazy_plt->plt_entry_size);
4102 /* Put offset the PC-relative instruction referring to the GOT
4103 entry, subtracting the size of that instruction. */
4104 got_pcrel_offset = (got->output_section->vma
4105 + got->output_offset
4107 - plt->output_section->vma
4108 - plt->output_offset
4110 - htab->non_lazy_plt->plt_got_insn_size);
4112 /* Check PC-relative offset overflow in GOT PLT entry. */
4113 got_after_plt = got->output_section->vma > plt->output_section->vma;
4114 if ((got_after_plt && got_pcrel_offset < 0)
4115 || (!got_after_plt && got_pcrel_offset > 0))
4116 /* xgettext:c-format */
4117 info->callbacks->einfo (_("%F%pB: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
4118 output_bfd, h->root.root.string);
4120 bfd_put_32 (output_bfd, got_pcrel_offset,
4121 (plt->contents + plt_offset
4122 + htab->non_lazy_plt->plt_got_offset));
4125 if (!local_undefweak
4127 && (h->plt.offset != (bfd_vma) -1
4128 || eh->plt_got.offset != (bfd_vma) -1))
4130 /* Mark the symbol as undefined, rather than as defined in
4131 the .plt section. Leave the value if there were any
4132 relocations where pointer equality matters (this is a clue
4133 for the dynamic linker, to make function pointer
4134 comparisons work between an application and shared
4135 library), otherwise set it to zero. If a function is only
4136 called from a binary, there is no need to slow down
4137 shared libraries because of that. */
4138 sym->st_shndx = SHN_UNDEF;
4139 if (!h->pointer_equality_needed)
4143 /* Don't generate dynamic GOT relocation against undefined weak
4144 symbol in executable. */
4145 if (h->got.offset != (bfd_vma) -1
4146 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type)
4147 && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE
4148 && !local_undefweak)
4150 Elf_Internal_Rela rela;
4151 asection *relgot = htab->elf.srelgot;
4153 /* This symbol has an entry in the global offset table. Set it
4155 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4158 rela.r_offset = (htab->elf.sgot->output_section->vma
4159 + htab->elf.sgot->output_offset
4160 + (h->got.offset &~ (bfd_vma) 1));
4162 /* If this is a static link, or it is a -Bsymbolic link and the
4163 symbol is defined locally or was forced to be local because
4164 of a version file, we just want to emit a RELATIVE reloc.
4165 The entry in the global offset table will already have been
4166 initialized in the relocate_section function. */
4168 && h->type == STT_GNU_IFUNC)
4170 if (h->plt.offset == (bfd_vma) -1)
4172 /* STT_GNU_IFUNC is referenced without PLT. */
4173 if (htab->elf.splt == NULL)
4175 /* use .rel[a].iplt section to store .got relocations
4176 in static executable. */
4177 relgot = htab->elf.irelplt;
4179 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
4181 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
4182 h->root.root.string,
4183 h->root.u.def.section->owner);
4185 rela.r_info = htab->r_info (0,
4186 R_X86_64_IRELATIVE);
4187 rela.r_addend = (h->root.u.def.value
4188 + h->root.u.def.section->output_section->vma
4189 + h->root.u.def.section->output_offset);
4194 else if (bfd_link_pic (info))
4196 /* Generate R_X86_64_GLOB_DAT. */
4204 if (!h->pointer_equality_needed)
4207 /* For non-shared object, we can't use .got.plt, which
4208 contains the real function addres if we need pointer
4209 equality. We load the GOT entry with the PLT entry. */
4210 if (htab->plt_second != NULL)
4212 plt = htab->plt_second;
4213 plt_offset = eh->plt_second.offset;
4217 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4218 plt_offset = h->plt.offset;
4220 bfd_put_64 (output_bfd, (plt->output_section->vma
4221 + plt->output_offset
4223 htab->elf.sgot->contents + h->got.offset);
4227 else if (bfd_link_pic (info)
4228 && SYMBOL_REFERENCES_LOCAL_P (info, h))
4230 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
4232 BFD_ASSERT((h->got.offset & 1) != 0);
4233 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4234 rela.r_addend = (h->root.u.def.value
4235 + h->root.u.def.section->output_section->vma
4236 + h->root.u.def.section->output_offset);
4240 BFD_ASSERT((h->got.offset & 1) == 0);
4242 bfd_put_64 (output_bfd, (bfd_vma) 0,
4243 htab->elf.sgot->contents + h->got.offset);
4244 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4248 elf_append_rela (output_bfd, relgot, &rela);
4253 Elf_Internal_Rela rela;
4256 /* This symbol needs a copy reloc. Set it up. */
4257 VERIFY_COPY_RELOC (h, htab)
4259 rela.r_offset = (h->root.u.def.value
4260 + h->root.u.def.section->output_section->vma
4261 + h->root.u.def.section->output_offset);
4262 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4264 if (h->root.u.def.section == htab->elf.sdynrelro)
4265 s = htab->elf.sreldynrelro;
4267 s = htab->elf.srelbss;
4268 elf_append_rela (output_bfd, s, &rela);
4274 /* Finish up local dynamic symbol handling. We set the contents of
4275 various dynamic sections here. */
4278 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4280 struct elf_link_hash_entry *h
4281 = (struct elf_link_hash_entry *) *slot;
4282 struct bfd_link_info *info
4283 = (struct bfd_link_info *) inf;
4285 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4289 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4290 here since undefined weak symbol may not be dynamic and may not be
4291 called for elf_x86_64_finish_dynamic_symbol. */
4294 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4297 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4298 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4300 if (h->root.type != bfd_link_hash_undefweak
4301 || h->dynindx != -1)
4304 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4308 /* Used to decide how to sort relocs in an optimal manner for the
4309 dynamic linker, before writing them out. */
4311 static enum elf_reloc_type_class
4312 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
4313 const asection *rel_sec ATTRIBUTE_UNUSED,
4314 const Elf_Internal_Rela *rela)
4316 bfd *abfd = info->output_bfd;
4317 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4318 struct elf_x86_link_hash_table *htab
4319 = elf_x86_hash_table (info, X86_64_ELF_DATA);
4321 if (htab->elf.dynsym != NULL
4322 && htab->elf.dynsym->contents != NULL)
4324 /* Check relocation against STT_GNU_IFUNC symbol if there are
4326 unsigned long r_symndx = htab->r_sym (rela->r_info);
4327 if (r_symndx != STN_UNDEF)
4329 Elf_Internal_Sym sym;
4330 if (!bed->s->swap_symbol_in (abfd,
4331 (htab->elf.dynsym->contents
4332 + r_symndx * bed->s->sizeof_sym),
4336 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4337 return reloc_class_ifunc;
4341 switch ((int) ELF32_R_TYPE (rela->r_info))
4343 case R_X86_64_IRELATIVE:
4344 return reloc_class_ifunc;
4345 case R_X86_64_RELATIVE:
4346 case R_X86_64_RELATIVE64:
4347 return reloc_class_relative;
4348 case R_X86_64_JUMP_SLOT:
4349 return reloc_class_plt;
4351 return reloc_class_copy;
4353 return reloc_class_normal;
4357 /* Finish up the dynamic sections. */
4360 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4361 struct bfd_link_info *info)
4363 struct elf_x86_link_hash_table *htab;
4365 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4369 if (! htab->elf.dynamic_sections_created)
4372 if (htab->elf.splt && htab->elf.splt->size > 0)
4374 elf_section_data (htab->elf.splt->output_section)
4375 ->this_hdr.sh_entsize = htab->plt.plt_entry_size;
4377 if (htab->plt.has_plt0)
4379 /* Fill in the special first entry in the procedure linkage
4381 memcpy (htab->elf.splt->contents,
4382 htab->lazy_plt->plt0_entry,
4383 htab->lazy_plt->plt0_entry_size);
4384 /* Add offset for pushq GOT+8(%rip), since the instruction
4385 uses 6 bytes subtract this value. */
4386 bfd_put_32 (output_bfd,
4387 (htab->elf.sgotplt->output_section->vma
4388 + htab->elf.sgotplt->output_offset
4390 - htab->elf.splt->output_section->vma
4391 - htab->elf.splt->output_offset
4393 (htab->elf.splt->contents
4394 + htab->lazy_plt->plt0_got1_offset));
4395 /* Add offset for the PC-relative instruction accessing
4396 GOT+16, subtracting the offset to the end of that
4398 bfd_put_32 (output_bfd,
4399 (htab->elf.sgotplt->output_section->vma
4400 + htab->elf.sgotplt->output_offset
4402 - htab->elf.splt->output_section->vma
4403 - htab->elf.splt->output_offset
4404 - htab->lazy_plt->plt0_got2_insn_end),
4405 (htab->elf.splt->contents
4406 + htab->lazy_plt->plt0_got2_offset));
4409 if (htab->tlsdesc_plt)
4411 /* The TLSDESC entry in a lazy procedure linkage table. */
4412 static const bfd_byte tlsdesc_plt_entry[LAZY_PLT_ENTRY_SIZE] =
4414 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
4415 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
4416 0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */
4419 bfd_put_64 (output_bfd, (bfd_vma) 0,
4420 htab->elf.sgot->contents + htab->tlsdesc_got);
4422 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4423 tlsdesc_plt_entry, LAZY_PLT_ENTRY_SIZE);
4425 /* Add offset for pushq GOT+8(%rip), since ENDBR64 uses 4
4426 bytes and the instruction uses 6 bytes, subtract these
4428 bfd_put_32 (output_bfd,
4429 (htab->elf.sgotplt->output_section->vma
4430 + htab->elf.sgotplt->output_offset
4432 - htab->elf.splt->output_section->vma
4433 - htab->elf.splt->output_offset
4436 (htab->elf.splt->contents
4439 /* Add offset for indirect branch via GOT+TDG, where TDG
4440 stands for htab->tlsdesc_got, subtracting the offset
4441 to the end of that instruction. */
4442 bfd_put_32 (output_bfd,
4443 (htab->elf.sgot->output_section->vma
4444 + htab->elf.sgot->output_offset
4446 - htab->elf.splt->output_section->vma
4447 - htab->elf.splt->output_offset
4450 (htab->elf.splt->contents
4451 + htab->tlsdesc_plt + 4 + 6 + 2));
4455 /* Fill PLT entries for undefined weak symbols in PIE. */
4456 if (bfd_link_pie (info))
4457 bfd_hash_traverse (&info->hash->table,
4458 elf_x86_64_pie_finish_undefweak_symbol,
4464 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4465 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4466 It has to be done before elf_link_sort_relocs is called so that
4467 dynamic relocations are properly sorted. */
4470 elf_x86_64_output_arch_local_syms
4471 (bfd *output_bfd ATTRIBUTE_UNUSED,
4472 struct bfd_link_info *info,
4473 void *flaginfo ATTRIBUTE_UNUSED,
4474 int (*func) (void *, const char *,
4477 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4479 struct elf_x86_link_hash_table *htab
4480 = elf_x86_hash_table (info, X86_64_ELF_DATA);
4484 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4485 htab_traverse (htab->loc_hash_table,
4486 elf_x86_64_finish_local_dynamic_symbol,
4492 /* Forward declaration. */
4493 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt;
4495 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4496 dynamic relocations. */
4499 elf_x86_64_get_synthetic_symtab (bfd *abfd,
4500 long symcount ATTRIBUTE_UNUSED,
4501 asymbol **syms ATTRIBUTE_UNUSED,
4508 bfd_byte *plt_contents;
4510 const struct elf_x86_lazy_plt_layout *lazy_plt;
4511 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4512 const struct elf_x86_lazy_plt_layout *lazy_bnd_plt;
4513 const struct elf_x86_non_lazy_plt_layout *non_lazy_bnd_plt;
4514 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4515 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4517 enum elf_x86_plt_type plt_type;
4518 struct elf_x86_plt plts[] =
4520 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4521 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4522 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4523 { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 },
4524 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4529 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4532 if (dynsymcount <= 0)
4535 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4539 if (get_elf_x86_backend_data (abfd)->target_os != is_nacl)
4541 lazy_plt = &elf_x86_64_lazy_plt;
4542 non_lazy_plt = &elf_x86_64_non_lazy_plt;
4543 lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt;
4544 non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt;
4545 if (ABI_64_P (abfd))
4547 lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
4548 non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
4552 lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
4553 non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
4558 lazy_plt = &elf_x86_64_nacl_plt;
4559 non_lazy_plt = NULL;
4560 lazy_bnd_plt = NULL;
4561 non_lazy_bnd_plt = NULL;
4562 lazy_ibt_plt = NULL;
4563 non_lazy_ibt_plt = NULL;
4567 for (j = 0; plts[j].name != NULL; j++)
4569 plt = bfd_get_section_by_name (abfd, plts[j].name);
4570 if (plt == NULL || plt->size == 0)
4573 /* Get the PLT section contents. */
4574 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4575 if (plt_contents == NULL)
4577 if (!bfd_get_section_contents (abfd, (asection *) plt,
4578 plt_contents, 0, plt->size))
4580 free (plt_contents);
4584 /* Check what kind of PLT it is. */
4585 plt_type = plt_unknown;
4586 if (plts[j].type == plt_unknown
4587 && (plt->size >= (lazy_plt->plt_entry_size
4588 + lazy_plt->plt_entry_size)))
4590 /* Match lazy PLT first. Need to check the first two
4592 if ((memcmp (plt_contents, lazy_plt->plt0_entry,
4593 lazy_plt->plt0_got1_offset) == 0)
4594 && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6,
4596 plt_type = plt_lazy;
4597 else if (lazy_bnd_plt != NULL
4598 && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry,
4599 lazy_bnd_plt->plt0_got1_offset) == 0)
4600 && (memcmp (plt_contents + 6,
4601 lazy_bnd_plt->plt0_entry + 6, 3) == 0))
4603 plt_type = plt_lazy | plt_second;
4604 /* The fist entry in the lazy IBT PLT is the same as the
4606 if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size,
4607 lazy_ibt_plt->plt_entry,
4608 lazy_ibt_plt->plt_got_offset) == 0))
4609 lazy_plt = lazy_ibt_plt;
4611 lazy_plt = lazy_bnd_plt;
4615 if (non_lazy_plt != NULL
4616 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4617 && plt->size >= non_lazy_plt->plt_entry_size)
4619 /* Match non-lazy PLT. */
4620 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4621 non_lazy_plt->plt_got_offset) == 0)
4622 plt_type = plt_non_lazy;
4625 if (plt_type == plt_unknown || plt_type == plt_second)
4627 if (non_lazy_bnd_plt != NULL
4628 && plt->size >= non_lazy_bnd_plt->plt_entry_size
4629 && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry,
4630 non_lazy_bnd_plt->plt_got_offset) == 0))
4632 /* Match BND PLT. */
4633 plt_type = plt_second;
4634 non_lazy_plt = non_lazy_bnd_plt;
4636 else if (non_lazy_ibt_plt != NULL
4637 && plt->size >= non_lazy_ibt_plt->plt_entry_size
4638 && (memcmp (plt_contents,
4639 non_lazy_ibt_plt->plt_entry,
4640 non_lazy_ibt_plt->plt_got_offset) == 0))
4642 /* Match IBT PLT. */
4643 plt_type = plt_second;
4644 non_lazy_plt = non_lazy_ibt_plt;
4648 if (plt_type == plt_unknown)
4650 free (plt_contents);
4655 plts[j].type = plt_type;
4657 if ((plt_type & plt_lazy))
4659 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4660 plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size;
4661 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4662 /* Skip PLT0 in lazy PLT. */
4667 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4668 plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size;
4669 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4673 /* Skip lazy PLT when the second PLT is used. */
4674 if (plt_type == (plt_lazy | plt_second))
4678 n = plt->size / plts[j].plt_entry_size;
4683 plts[j].contents = plt_contents;
4686 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4687 (bfd_vma) 0, plts, dynsyms,
4691 /* Handle an x86-64 specific section when reading an object file. This
4692 is called when elfcode.h finds a section with an unknown type. */
4695 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
4696 const char *name, int shindex)
4698 if (hdr->sh_type != SHT_X86_64_UNWIND)
4701 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4707 /* Hook called by the linker routine which adds symbols from an object
4708 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4712 elf_x86_64_add_symbol_hook (bfd *abfd,
4713 struct bfd_link_info *info ATTRIBUTE_UNUSED,
4714 Elf_Internal_Sym *sym,
4715 const char **namep ATTRIBUTE_UNUSED,
4716 flagword *flagsp ATTRIBUTE_UNUSED,
4722 switch (sym->st_shndx)
4724 case SHN_X86_64_LCOMMON:
4725 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4728 lcomm = bfd_make_section_with_flags (abfd,
4732 | SEC_LINKER_CREATED));
4735 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4738 *valp = sym->st_size;
4746 /* Given a BFD section, try to locate the corresponding ELF section
4750 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4751 asection *sec, int *index_return)
4753 if (sec == &_bfd_elf_large_com_section)
4755 *index_return = SHN_X86_64_LCOMMON;
4761 /* Process a symbol. */
4764 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4767 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4769 switch (elfsym->internal_elf_sym.st_shndx)
4771 case SHN_X86_64_LCOMMON:
4772 asym->section = &_bfd_elf_large_com_section;
4773 asym->value = elfsym->internal_elf_sym.st_size;
4774 /* Common symbol doesn't set BSF_GLOBAL. */
4775 asym->flags &= ~BSF_GLOBAL;
4781 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
4783 return (sym->st_shndx == SHN_COMMON
4784 || sym->st_shndx == SHN_X86_64_LCOMMON);
4788 elf_x86_64_common_section_index (asection *sec)
4790 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4793 return SHN_X86_64_LCOMMON;
4797 elf_x86_64_common_section (asection *sec)
4799 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4800 return bfd_com_section_ptr;
4802 return &_bfd_elf_large_com_section;
4806 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
4807 const Elf_Internal_Sym *sym,
4812 const asection *oldsec)
4814 /* A normal common symbol and a large common symbol result in a
4815 normal common symbol. We turn the large common symbol into a
4818 && h->root.type == bfd_link_hash_common
4820 && bfd_is_com_section (*psec)
4823 if (sym->st_shndx == SHN_COMMON
4824 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
4826 h->root.u.c.p->section
4827 = bfd_make_section_old_way (oldbfd, "COMMON");
4828 h->root.u.c.p->section->flags = SEC_ALLOC;
4830 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4831 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
4832 *psec = bfd_com_section_ptr;
4839 elf_x86_64_additional_program_headers (bfd *abfd,
4840 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4845 /* Check to see if we need a large readonly segment. */
4846 s = bfd_get_section_by_name (abfd, ".lrodata");
4847 if (s && (s->flags & SEC_LOAD))
4850 /* Check to see if we need a large data segment. Since .lbss sections
4851 is placed right after the .bss section, there should be no need for
4852 a large data segment just because of .lbss. */
4853 s = bfd_get_section_by_name (abfd, ".ldata");
4854 if (s && (s->flags & SEC_LOAD))
4860 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4863 elf_x86_64_relocs_compatible (const bfd_target *input,
4864 const bfd_target *output)
4866 return ((xvec_get_elf_backend_data (input)->s->elfclass
4867 == xvec_get_elf_backend_data (output)->s->elfclass)
4868 && _bfd_elf_relocs_compatible (input, output));
4871 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
4872 with GNU properties if found. Otherwise, return NULL. */
4875 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info)
4877 struct elf_x86_init_table init_table;
4879 if ((int) R_X86_64_standard >= (int) R_X86_64_converted_reloc_bit
4880 || (int) R_X86_64_max <= (int) R_X86_64_converted_reloc_bit
4881 || ((int) (R_X86_64_GNU_VTINHERIT | R_X86_64_converted_reloc_bit)
4882 != (int) R_X86_64_GNU_VTINHERIT)
4883 || ((int) (R_X86_64_GNU_VTENTRY | R_X86_64_converted_reloc_bit)
4884 != (int) R_X86_64_GNU_VTENTRY))
4887 /* This is unused for x86-64. */
4888 init_table.plt0_pad_byte = 0x90;
4890 if (get_elf_x86_backend_data (info->output_bfd)->target_os != is_nacl)
4894 init_table.lazy_plt = &elf_x86_64_lazy_bnd_plt;
4895 init_table.non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt;
4899 init_table.lazy_plt = &elf_x86_64_lazy_plt;
4900 init_table.non_lazy_plt = &elf_x86_64_non_lazy_plt;
4903 if (ABI_64_P (info->output_bfd))
4905 init_table.lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
4906 init_table.non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
4910 init_table.lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
4911 init_table.non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
4916 init_table.lazy_plt = &elf_x86_64_nacl_plt;
4917 init_table.non_lazy_plt = NULL;
4918 init_table.lazy_ibt_plt = NULL;
4919 init_table.non_lazy_ibt_plt = NULL;
4922 if (ABI_64_P (info->output_bfd))
4924 init_table.r_info = elf64_r_info;
4925 init_table.r_sym = elf64_r_sym;
4929 init_table.r_info = elf32_r_info;
4930 init_table.r_sym = elf32_r_sym;
4933 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4936 static const struct bfd_elf_special_section
4937 elf_x86_64_special_sections[]=
4939 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4940 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4941 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4942 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4943 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4944 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4945 { NULL, 0, 0, 0, 0 }
4948 #define TARGET_LITTLE_SYM x86_64_elf64_vec
4949 #define TARGET_LITTLE_NAME "elf64-x86-64"
4950 #define ELF_ARCH bfd_arch_i386
4951 #define ELF_TARGET_ID X86_64_ELF_DATA
4952 #define ELF_MACHINE_CODE EM_X86_64
4953 #if DEFAULT_LD_Z_SEPARATE_CODE
4954 # define ELF_MAXPAGESIZE 0x1000
4956 # define ELF_MAXPAGESIZE 0x200000
4958 #define ELF_MINPAGESIZE 0x1000
4959 #define ELF_COMMONPAGESIZE 0x1000
4961 #define elf_backend_can_gc_sections 1
4962 #define elf_backend_can_refcount 1
4963 #define elf_backend_want_got_plt 1
4964 #define elf_backend_plt_readonly 1
4965 #define elf_backend_want_plt_sym 0
4966 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4967 #define elf_backend_rela_normal 1
4968 #define elf_backend_plt_alignment 4
4969 #define elf_backend_extern_protected_data 1
4970 #define elf_backend_caches_rawsize 1
4971 #define elf_backend_dtrel_excludes_plt 1
4972 #define elf_backend_want_dynrelro 1
4974 #define elf_info_to_howto elf_x86_64_info_to_howto
4976 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
4977 #define bfd_elf64_bfd_reloc_name_lookup \
4978 elf_x86_64_reloc_name_lookup
4980 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
4981 #define elf_backend_check_relocs elf_x86_64_check_relocs
4982 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4983 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
4984 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
4985 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
4986 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
4987 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
4989 #define elf_backend_write_core_note elf_x86_64_write_core_note
4991 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
4992 #define elf_backend_relocate_section elf_x86_64_relocate_section
4993 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4994 #define elf_backend_object_p elf64_x86_64_elf_object_p
4995 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
4997 #define elf_backend_section_from_shdr \
4998 elf_x86_64_section_from_shdr
5000 #define elf_backend_section_from_bfd_section \
5001 elf_x86_64_elf_section_from_bfd_section
5002 #define elf_backend_add_symbol_hook \
5003 elf_x86_64_add_symbol_hook
5004 #define elf_backend_symbol_processing \
5005 elf_x86_64_symbol_processing
5006 #define elf_backend_common_section_index \
5007 elf_x86_64_common_section_index
5008 #define elf_backend_common_section \
5009 elf_x86_64_common_section
5010 #define elf_backend_common_definition \
5011 elf_x86_64_common_definition
5012 #define elf_backend_merge_symbol \
5013 elf_x86_64_merge_symbol
5014 #define elf_backend_special_sections \
5015 elf_x86_64_special_sections
5016 #define elf_backend_additional_program_headers \
5017 elf_x86_64_additional_program_headers
5018 #define elf_backend_setup_gnu_properties \
5019 elf_x86_64_link_setup_gnu_properties
5020 #define elf_backend_hide_symbol \
5021 _bfd_x86_elf_hide_symbol
5023 #include "elf64-target.h"
5025 /* CloudABI support. */
5027 #undef TARGET_LITTLE_SYM
5028 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
5029 #undef TARGET_LITTLE_NAME
5030 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
5033 #define ELF_OSABI ELFOSABI_CLOUDABI
5036 #define elf64_bed elf64_x86_64_cloudabi_bed
5038 #include "elf64-target.h"
5040 /* FreeBSD support. */
5042 #undef TARGET_LITTLE_SYM
5043 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5044 #undef TARGET_LITTLE_NAME
5045 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5048 #define ELF_OSABI ELFOSABI_FREEBSD
5051 #define elf64_bed elf64_x86_64_fbsd_bed
5053 #include "elf64-target.h"
5055 /* Solaris 2 support. */
5057 #undef TARGET_LITTLE_SYM
5058 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5059 #undef TARGET_LITTLE_NAME
5060 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5062 static const struct elf_x86_backend_data elf_x86_64_solaris_arch_bed =
5067 #undef elf_backend_arch_data
5068 #define elf_backend_arch_data &elf_x86_64_solaris_arch_bed
5070 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5071 objects won't be recognized. */
5075 #define elf64_bed elf64_x86_64_sol2_bed
5077 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5079 #undef elf_backend_static_tls_alignment
5080 #define elf_backend_static_tls_alignment 16
5082 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5084 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5086 #undef elf_backend_want_plt_sym
5087 #define elf_backend_want_plt_sym 1
5089 #undef elf_backend_strtab_flags
5090 #define elf_backend_strtab_flags SHF_STRINGS
5093 elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
5094 bfd *obfd ATTRIBUTE_UNUSED,
5095 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
5096 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
5098 /* PR 19938: FIXME: Need to add code for setting the sh_info
5099 and sh_link fields of Solaris specific section types. */
5103 #undef elf_backend_copy_special_section_fields
5104 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
5106 #include "elf64-target.h"
5108 /* Native Client support. */
5111 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
5113 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
5114 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
5118 #undef TARGET_LITTLE_SYM
5119 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
5120 #undef TARGET_LITTLE_NAME
5121 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5123 #define elf64_bed elf64_x86_64_nacl_bed
5125 #undef ELF_MAXPAGESIZE
5126 #undef ELF_MINPAGESIZE
5127 #undef ELF_COMMONPAGESIZE
5128 #define ELF_MAXPAGESIZE 0x10000
5129 #define ELF_MINPAGESIZE 0x10000
5130 #define ELF_COMMONPAGESIZE 0x10000
5132 /* Restore defaults. */
5134 #undef elf_backend_static_tls_alignment
5135 #undef elf_backend_want_plt_sym
5136 #define elf_backend_want_plt_sym 0
5137 #undef elf_backend_strtab_flags
5138 #undef elf_backend_copy_special_section_fields
5140 /* NaCl uses substantially different PLT entries for the same effects. */
5142 #undef elf_backend_plt_alignment
5143 #define elf_backend_plt_alignment 5
5144 #define NACL_PLT_ENTRY_SIZE 64
5145 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5147 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5149 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5150 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5151 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5152 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5153 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5155 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5156 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
5158 /* 32 bytes of nop to pad out to the standard size. */
5159 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
5160 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5161 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
5162 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5163 0x66, /* excess data16 prefix */
5167 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5169 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5170 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5171 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5172 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5174 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5175 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
5176 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5178 /* Lazy GOT entries point here (32-byte aligned). */
5179 0x68, /* pushq immediate */
5180 0, 0, 0, 0, /* replaced with index into relocation table. */
5181 0xe9, /* jmp relative */
5182 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5184 /* 22 bytes of nop to pad out to the standard size. */
5185 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
5186 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5187 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5190 /* .eh_frame covering the .plt section. */
5192 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
5194 #if (PLT_CIE_LENGTH != 20 \
5195 || PLT_FDE_LENGTH != 36 \
5196 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5197 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5198 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
5200 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5201 0, 0, 0, 0, /* CIE ID */
5202 1, /* CIE version */
5203 'z', 'R', 0, /* Augmentation string */
5204 1, /* Code alignment factor */
5205 0x78, /* Data alignment factor */
5206 16, /* Return address column */
5207 1, /* Augmentation size */
5208 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5209 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5210 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5211 DW_CFA_nop, DW_CFA_nop,
5213 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5214 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
5215 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5216 0, 0, 0, 0, /* .plt size goes here */
5217 0, /* Augmentation size */
5218 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
5219 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5220 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
5221 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5222 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5223 13, /* Block length */
5224 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
5225 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
5226 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5227 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
5228 DW_CFA_nop, DW_CFA_nop
5231 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt =
5233 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
5234 NACL_PLT_ENTRY_SIZE, /* plt0_entry_size */
5235 elf_x86_64_nacl_plt_entry, /* plt_entry */
5236 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5237 2, /* plt0_got1_offset */
5238 9, /* plt0_got2_offset */
5239 13, /* plt0_got2_insn_end */
5240 3, /* plt_got_offset */
5241 33, /* plt_reloc_offset */
5242 38, /* plt_plt_offset */
5243 7, /* plt_got_insn_size */
5244 42, /* plt_plt_insn_end */
5245 32, /* plt_lazy_offset */
5246 elf_x86_64_nacl_plt0_entry, /* pic_plt0_entry */
5247 elf_x86_64_nacl_plt_entry, /* pic_plt_entry */
5248 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
5249 sizeof (elf_x86_64_nacl_eh_frame_plt) /* eh_frame_plt_size */
5252 static const struct elf_x86_backend_data elf_x86_64_nacl_arch_bed =
5257 #undef elf_backend_arch_data
5258 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5260 #undef elf_backend_object_p
5261 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
5262 #undef elf_backend_modify_segment_map
5263 #define elf_backend_modify_segment_map nacl_modify_segment_map
5264 #undef elf_backend_modify_program_headers
5265 #define elf_backend_modify_program_headers nacl_modify_program_headers
5266 #undef elf_backend_final_write_processing
5267 #define elf_backend_final_write_processing nacl_final_write_processing
5269 #include "elf64-target.h"
5271 /* Native Client x32 support. */
5274 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
5276 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
5277 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
5281 #undef TARGET_LITTLE_SYM
5282 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
5283 #undef TARGET_LITTLE_NAME
5284 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5286 #define elf32_bed elf32_x86_64_nacl_bed
5288 #define bfd_elf32_bfd_reloc_type_lookup \
5289 elf_x86_64_reloc_type_lookup
5290 #define bfd_elf32_bfd_reloc_name_lookup \
5291 elf_x86_64_reloc_name_lookup
5292 #define bfd_elf32_get_synthetic_symtab \
5293 elf_x86_64_get_synthetic_symtab
5295 #undef elf_backend_object_p
5296 #define elf_backend_object_p \
5297 elf32_x86_64_nacl_elf_object_p
5299 #undef elf_backend_bfd_from_remote_memory
5300 #define elf_backend_bfd_from_remote_memory \
5301 _bfd_elf32_bfd_from_remote_memory
5303 #undef elf_backend_size_info
5304 #define elf_backend_size_info \
5305 _bfd_elf32_size_info
5307 #include "elf32-target.h"
5309 /* Restore defaults. */
5310 #undef elf_backend_object_p
5311 #define elf_backend_object_p elf64_x86_64_elf_object_p
5312 #undef elf_backend_bfd_from_remote_memory
5313 #undef elf_backend_size_info
5314 #undef elf_backend_modify_segment_map
5315 #undef elf_backend_modify_program_headers
5316 #undef elf_backend_final_write_processing
5318 /* Intel L1OM support. */
5321 elf64_l1om_elf_object_p (bfd *abfd)
5323 /* Set the right machine number for an L1OM elf64 file. */
5324 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
5328 #undef TARGET_LITTLE_SYM
5329 #define TARGET_LITTLE_SYM l1om_elf64_vec
5330 #undef TARGET_LITTLE_NAME
5331 #define TARGET_LITTLE_NAME "elf64-l1om"
5333 #define ELF_ARCH bfd_arch_l1om
5335 #undef ELF_MACHINE_CODE
5336 #define ELF_MACHINE_CODE EM_L1OM
5341 #define elf64_bed elf64_l1om_bed
5343 #undef elf_backend_object_p
5344 #define elf_backend_object_p elf64_l1om_elf_object_p
5346 /* Restore defaults. */
5347 #undef ELF_MAXPAGESIZE
5348 #undef ELF_MINPAGESIZE
5349 #undef ELF_COMMONPAGESIZE
5350 #if DEFAULT_LD_Z_SEPARATE_CODE
5351 # define ELF_MAXPAGESIZE 0x1000
5353 # define ELF_MAXPAGESIZE 0x200000
5355 #define ELF_MINPAGESIZE 0x1000
5356 #define ELF_COMMONPAGESIZE 0x1000
5357 #undef elf_backend_plt_alignment
5358 #define elf_backend_plt_alignment 4
5359 #undef elf_backend_arch_data
5360 #define elf_backend_arch_data &elf_x86_64_arch_bed
5362 #include "elf64-target.h"
5364 /* FreeBSD L1OM support. */
5366 #undef TARGET_LITTLE_SYM
5367 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
5368 #undef TARGET_LITTLE_NAME
5369 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5372 #define ELF_OSABI ELFOSABI_FREEBSD
5375 #define elf64_bed elf64_l1om_fbsd_bed
5377 #include "elf64-target.h"
5379 /* Intel K1OM support. */
5382 elf64_k1om_elf_object_p (bfd *abfd)
5384 /* Set the right machine number for an K1OM elf64 file. */
5385 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
5389 #undef TARGET_LITTLE_SYM
5390 #define TARGET_LITTLE_SYM k1om_elf64_vec
5391 #undef TARGET_LITTLE_NAME
5392 #define TARGET_LITTLE_NAME "elf64-k1om"
5394 #define ELF_ARCH bfd_arch_k1om
5396 #undef ELF_MACHINE_CODE
5397 #define ELF_MACHINE_CODE EM_K1OM
5402 #define elf64_bed elf64_k1om_bed
5404 #undef elf_backend_object_p
5405 #define elf_backend_object_p elf64_k1om_elf_object_p
5407 #undef elf_backend_static_tls_alignment
5409 #undef elf_backend_want_plt_sym
5410 #define elf_backend_want_plt_sym 0
5412 #include "elf64-target.h"
5414 /* FreeBSD K1OM support. */
5416 #undef TARGET_LITTLE_SYM
5417 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
5418 #undef TARGET_LITTLE_NAME
5419 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5422 #define ELF_OSABI ELFOSABI_FREEBSD
5425 #define elf64_bed elf64_k1om_fbsd_bed
5427 #include "elf64-target.h"
5429 /* 32bit x86-64 support. */
5431 #undef TARGET_LITTLE_SYM
5432 #define TARGET_LITTLE_SYM x86_64_elf32_vec
5433 #undef TARGET_LITTLE_NAME
5434 #define TARGET_LITTLE_NAME "elf32-x86-64"
5438 #define ELF_ARCH bfd_arch_i386
5440 #undef ELF_MACHINE_CODE
5441 #define ELF_MACHINE_CODE EM_X86_64
5445 #undef elf_backend_object_p
5446 #define elf_backend_object_p \
5447 elf32_x86_64_elf_object_p
5449 #undef elf_backend_bfd_from_remote_memory
5450 #define elf_backend_bfd_from_remote_memory \
5451 _bfd_elf32_bfd_from_remote_memory
5453 #undef elf_backend_size_info
5454 #define elf_backend_size_info \
5455 _bfd_elf32_size_info
5457 #include "elf32-target.h"