1 /* X86-64 specific support for ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 Free Software Foundation, Inc.
5 Contributed by Jan Hubicka <jh@suse.cz>.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
30 #include "bfd_stdint.h"
34 #include "libiberty.h"
36 #include "elf/x86-64.h"
43 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
44 #define MINUS_ONE (~ (bfd_vma) 0)
46 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
47 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
48 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
49 since they are the same. */
51 #define ABI_64_P(abfd) \
52 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
54 /* The relocation "howto" table. Order of fields:
55 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
56 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
57 static reloc_howto_type x86_64_elf_howto_table[] =
59 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
60 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
62 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
65 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
66 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
68 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
69 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
71 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
72 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
74 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
75 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
77 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
80 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
83 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
86 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
87 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
89 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
90 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
92 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
93 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
95 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
99 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
101 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
102 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
103 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
106 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
109 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
110 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
112 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
113 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
115 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
116 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
118 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
119 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
121 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
122 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
124 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
125 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
127 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
130 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
132 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
133 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
134 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
135 FALSE, 0xffffffff, 0xffffffff, TRUE),
136 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
137 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
139 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
140 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
142 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
143 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
144 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
145 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
146 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
148 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
149 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
151 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
152 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
154 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
155 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
157 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
158 complain_overflow_bitfield, bfd_elf_generic_reloc,
159 "R_X86_64_GOTPC32_TLSDESC",
160 FALSE, 0xffffffff, 0xffffffff, TRUE),
161 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
162 complain_overflow_dont, bfd_elf_generic_reloc,
163 "R_X86_64_TLSDESC_CALL",
165 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
166 complain_overflow_bitfield, bfd_elf_generic_reloc,
168 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
169 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
170 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
172 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
173 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
175 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
176 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
178 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
179 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
182 /* We have a gap in the reloc numbers here.
183 R_X86_64_standard counts the number up to this point, and
184 R_X86_64_vt_offset is the value to subtract from a reloc type of
185 R_X86_64_GNU_VT* to form an index into this table. */
186 #define R_X86_64_standard (R_X86_64_PLT32_BND + 1)
187 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
189 /* GNU extension to record C++ vtable hierarchy. */
190 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
191 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
193 /* GNU extension to record C++ vtable member usage. */
194 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
195 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
198 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
199 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
200 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
204 #define IS_X86_64_PCREL_TYPE(TYPE) \
205 ( ((TYPE) == R_X86_64_PC8) \
206 || ((TYPE) == R_X86_64_PC16) \
207 || ((TYPE) == R_X86_64_PC32) \
208 || ((TYPE) == R_X86_64_PC32_BND) \
209 || ((TYPE) == R_X86_64_PC64))
211 /* Map BFD relocs to the x86_64 elf relocs. */
214 bfd_reloc_code_real_type bfd_reloc_val;
215 unsigned char elf_reloc_val;
218 static const struct elf_reloc_map x86_64_reloc_map[] =
220 { BFD_RELOC_NONE, R_X86_64_NONE, },
221 { BFD_RELOC_64, R_X86_64_64, },
222 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
223 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
224 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
225 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
226 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
227 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
228 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
229 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
230 { BFD_RELOC_32, R_X86_64_32, },
231 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
232 { BFD_RELOC_16, R_X86_64_16, },
233 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
234 { BFD_RELOC_8, R_X86_64_8, },
235 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
236 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
237 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
238 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
239 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
240 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
241 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
242 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
243 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
244 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
245 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
246 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
247 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
248 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
249 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
250 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
251 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
252 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
253 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
254 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
255 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
256 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
257 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
258 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND,},
259 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND,},
260 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
261 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
264 static reloc_howto_type *
265 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
269 if (r_type == (unsigned int) R_X86_64_32)
274 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
276 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
277 || r_type >= (unsigned int) R_X86_64_max)
279 if (r_type >= (unsigned int) R_X86_64_standard)
281 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
283 r_type = R_X86_64_NONE;
288 i = r_type - (unsigned int) R_X86_64_vt_offset;
289 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
290 return &x86_64_elf_howto_table[i];
293 /* Given a BFD reloc type, return a HOWTO structure. */
294 static reloc_howto_type *
295 elf_x86_64_reloc_type_lookup (bfd *abfd,
296 bfd_reloc_code_real_type code)
300 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
303 if (x86_64_reloc_map[i].bfd_reloc_val == code)
304 return elf_x86_64_rtype_to_howto (abfd,
305 x86_64_reloc_map[i].elf_reloc_val);
310 static reloc_howto_type *
311 elf_x86_64_reloc_name_lookup (bfd *abfd,
316 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
318 /* Get x32 R_X86_64_32. */
319 reloc_howto_type *reloc
320 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
321 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
325 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
326 if (x86_64_elf_howto_table[i].name != NULL
327 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
328 return &x86_64_elf_howto_table[i];
333 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
336 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
337 Elf_Internal_Rela *dst)
341 r_type = ELF32_R_TYPE (dst->r_info);
342 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
343 BFD_ASSERT (r_type == cache_ptr->howto->type);
346 /* Support for core dump NOTE sections. */
348 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
353 switch (note->descsz)
358 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
360 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
363 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
371 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
373 elf_tdata (abfd)->core->signal
374 = bfd_get_16 (abfd, note->descdata + 12);
377 elf_tdata (abfd)->core->lwpid
378 = bfd_get_32 (abfd, note->descdata + 32);
387 /* Make a ".reg/999" section. */
388 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
389 size, note->descpos + offset);
393 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
395 switch (note->descsz)
400 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
401 elf_tdata (abfd)->core->pid
402 = bfd_get_32 (abfd, note->descdata + 12);
403 elf_tdata (abfd)->core->program
404 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
405 elf_tdata (abfd)->core->command
406 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
409 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
410 elf_tdata (abfd)->core->pid
411 = bfd_get_32 (abfd, note->descdata + 24);
412 elf_tdata (abfd)->core->program
413 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
414 elf_tdata (abfd)->core->command
415 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
418 /* Note that for some reason, a spurious space is tacked
419 onto the end of the args in some (at least one anyway)
420 implementations, so strip it off if it exists. */
423 char *command = elf_tdata (abfd)->core->command;
424 int n = strlen (command);
426 if (0 < n && command[n - 1] == ' ')
427 command[n - 1] = '\0';
435 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
438 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
440 const char *fname, *psargs;
451 va_start (ap, note_type);
452 fname = va_arg (ap, const char *);
453 psargs = va_arg (ap, const char *);
456 if (bed->s->elfclass == ELFCLASS32)
459 memset (&data, 0, sizeof (data));
460 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
461 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
462 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
463 &data, sizeof (data));
468 memset (&data, 0, sizeof (data));
469 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
470 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
471 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
472 &data, sizeof (data));
477 va_start (ap, note_type);
478 pid = va_arg (ap, long);
479 cursig = va_arg (ap, int);
480 gregs = va_arg (ap, const void *);
483 if (bed->s->elfclass == ELFCLASS32)
485 if (bed->elf_machine_code == EM_X86_64)
487 prstatusx32_t prstat;
488 memset (&prstat, 0, sizeof (prstat));
490 prstat.pr_cursig = cursig;
491 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
492 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
493 &prstat, sizeof (prstat));
498 memset (&prstat, 0, sizeof (prstat));
500 prstat.pr_cursig = cursig;
501 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
502 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
503 &prstat, sizeof (prstat));
509 memset (&prstat, 0, sizeof (prstat));
511 prstat.pr_cursig = cursig;
512 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
513 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
514 &prstat, sizeof (prstat));
521 /* Functions for the x86-64 ELF linker. */
523 /* The name of the dynamic interpreter. This is put in the .interp
526 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
527 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
529 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
533 #define ELIMINATE_COPY_RELOCS 1
535 /* The size in bytes of an entry in the global offset table. */
537 #define GOT_ENTRY_SIZE 8
539 /* The size in bytes of an entry in the procedure linkage table. */
541 #define PLT_ENTRY_SIZE 16
543 /* The first entry in a procedure linkage table looks like this. See the
544 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
546 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
548 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
549 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
550 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
553 /* Subsequent entries in a procedure linkage table look like this. */
555 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
557 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
558 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
559 0x68, /* pushq immediate */
560 0, 0, 0, 0, /* replaced with index into relocation table. */
561 0xe9, /* jmp relative */
562 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
565 /* .eh_frame covering the .plt section. */
567 static const bfd_byte elf_x86_64_eh_frame_plt[] =
569 #define PLT_CIE_LENGTH 20
570 #define PLT_FDE_LENGTH 36
571 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
572 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
573 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
574 0, 0, 0, 0, /* CIE ID */
576 'z', 'R', 0, /* Augmentation string */
577 1, /* Code alignment factor */
578 0x78, /* Data alignment factor */
579 16, /* Return address column */
580 1, /* Augmentation size */
581 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
582 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
583 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
584 DW_CFA_nop, DW_CFA_nop,
586 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
587 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
588 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
589 0, 0, 0, 0, /* .plt size goes here */
590 0, /* Augmentation size */
591 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
592 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
593 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
594 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
595 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
596 11, /* Block length */
597 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
598 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
599 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
600 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
601 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
604 /* Architecture-specific backend data for x86-64. */
606 struct elf_x86_64_backend_data
608 /* Templates for the initial PLT entry and for subsequent entries. */
609 const bfd_byte *plt0_entry;
610 const bfd_byte *plt_entry;
611 unsigned int plt_entry_size; /* Size of each PLT entry. */
613 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
614 unsigned int plt0_got1_offset;
615 unsigned int plt0_got2_offset;
617 /* Offset of the end of the PC-relative instruction containing
619 unsigned int plt0_got2_insn_end;
621 /* Offsets into plt_entry that are to be replaced with... */
622 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
623 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
624 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
626 /* Length of the PC-relative instruction containing plt_got_offset. */
627 unsigned int plt_got_insn_size;
629 /* Offset of the end of the PC-relative jump to plt0_entry. */
630 unsigned int plt_plt_insn_end;
632 /* Offset into plt_entry where the initial value of the GOT entry points. */
633 unsigned int plt_lazy_offset;
635 /* .eh_frame covering the .plt section. */
636 const bfd_byte *eh_frame_plt;
637 unsigned int eh_frame_plt_size;
640 #define get_elf_x86_64_arch_data(bed) \
641 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
643 #define get_elf_x86_64_backend_data(abfd) \
644 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
646 #define GET_PLT_ENTRY_SIZE(abfd) \
647 get_elf_x86_64_backend_data (abfd)->plt_entry_size
649 /* These are the standard parameters. */
650 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
652 elf_x86_64_plt0_entry, /* plt0_entry */
653 elf_x86_64_plt_entry, /* plt_entry */
654 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
655 2, /* plt0_got1_offset */
656 8, /* plt0_got2_offset */
657 12, /* plt0_got2_insn_end */
658 2, /* plt_got_offset */
659 7, /* plt_reloc_offset */
660 12, /* plt_plt_offset */
661 6, /* plt_got_insn_size */
662 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
663 6, /* plt_lazy_offset */
664 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
665 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
668 #define elf_backend_arch_data &elf_x86_64_arch_bed
670 /* x86-64 ELF linker hash entry. */
672 struct elf_x86_64_link_hash_entry
674 struct elf_link_hash_entry elf;
676 /* Track dynamic relocs copied for this symbol. */
677 struct elf_dyn_relocs *dyn_relocs;
679 #define GOT_UNKNOWN 0
683 #define GOT_TLS_GDESC 4
684 #define GOT_TLS_GD_BOTH_P(type) \
685 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
686 #define GOT_TLS_GD_P(type) \
687 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
688 #define GOT_TLS_GDESC_P(type) \
689 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
690 #define GOT_TLS_GD_ANY_P(type) \
691 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
692 unsigned char tls_type;
694 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
695 starting at the end of the jump table. */
699 #define elf_x86_64_hash_entry(ent) \
700 ((struct elf_x86_64_link_hash_entry *)(ent))
702 struct elf_x86_64_obj_tdata
704 struct elf_obj_tdata root;
706 /* tls_type for each local got entry. */
707 char *local_got_tls_type;
709 /* GOTPLT entries for TLS descriptors. */
710 bfd_vma *local_tlsdesc_gotent;
713 #define elf_x86_64_tdata(abfd) \
714 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
716 #define elf_x86_64_local_got_tls_type(abfd) \
717 (elf_x86_64_tdata (abfd)->local_got_tls_type)
719 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
720 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
722 #define is_x86_64_elf(bfd) \
723 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
724 && elf_tdata (bfd) != NULL \
725 && elf_object_id (bfd) == X86_64_ELF_DATA)
728 elf_x86_64_mkobject (bfd *abfd)
730 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
734 /* x86-64 ELF linker hash table. */
736 struct elf_x86_64_link_hash_table
738 struct elf_link_hash_table elf;
740 /* Short-cuts to get to dynamic linker sections. */
743 asection *plt_eh_frame;
747 bfd_signed_vma refcount;
751 /* The amount of space used by the jump slots in the GOT. */
752 bfd_vma sgotplt_jump_table_size;
754 /* Small local sym cache. */
755 struct sym_cache sym_cache;
757 bfd_vma (*r_info) (bfd_vma, bfd_vma);
758 bfd_vma (*r_sym) (bfd_vma);
759 unsigned int pointer_r_type;
760 const char *dynamic_interpreter;
761 int dynamic_interpreter_size;
763 /* _TLS_MODULE_BASE_ symbol. */
764 struct bfd_link_hash_entry *tls_module_base;
766 /* Used by local STT_GNU_IFUNC symbols. */
767 htab_t loc_hash_table;
768 void * loc_hash_memory;
770 /* The offset into splt of the PLT entry for the TLS descriptor
771 resolver. Special values are 0, if not necessary (or not found
772 to be necessary yet), and -1 if needed but not determined
775 /* The offset into sgot of the GOT entry used by the PLT entry
779 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
780 bfd_vma next_jump_slot_index;
781 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
782 bfd_vma next_irelative_index;
785 /* Get the x86-64 ELF linker hash table from a link_info structure. */
787 #define elf_x86_64_hash_table(p) \
788 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
789 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
791 #define elf_x86_64_compute_jump_table_size(htab) \
792 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
794 /* Create an entry in an x86-64 ELF linker hash table. */
796 static struct bfd_hash_entry *
797 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
798 struct bfd_hash_table *table,
801 /* Allocate the structure if it has not already been allocated by a
805 entry = (struct bfd_hash_entry *)
806 bfd_hash_allocate (table,
807 sizeof (struct elf_x86_64_link_hash_entry));
812 /* Call the allocation method of the superclass. */
813 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
816 struct elf_x86_64_link_hash_entry *eh;
818 eh = (struct elf_x86_64_link_hash_entry *) entry;
819 eh->dyn_relocs = NULL;
820 eh->tls_type = GOT_UNKNOWN;
821 eh->tlsdesc_got = (bfd_vma) -1;
827 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
828 for local symbol so that we can handle local STT_GNU_IFUNC symbols
829 as global symbol. We reuse indx and dynstr_index for local symbol
830 hash since they aren't used by global symbols in this backend. */
833 elf_x86_64_local_htab_hash (const void *ptr)
835 struct elf_link_hash_entry *h
836 = (struct elf_link_hash_entry *) ptr;
837 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
840 /* Compare local hash entries. */
843 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
845 struct elf_link_hash_entry *h1
846 = (struct elf_link_hash_entry *) ptr1;
847 struct elf_link_hash_entry *h2
848 = (struct elf_link_hash_entry *) ptr2;
850 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
853 /* Find and/or create a hash entry for local symbol. */
855 static struct elf_link_hash_entry *
856 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
857 bfd *abfd, const Elf_Internal_Rela *rel,
860 struct elf_x86_64_link_hash_entry e, *ret;
861 asection *sec = abfd->sections;
862 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
863 htab->r_sym (rel->r_info));
866 e.elf.indx = sec->id;
867 e.elf.dynstr_index = htab->r_sym (rel->r_info);
868 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
869 create ? INSERT : NO_INSERT);
876 ret = (struct elf_x86_64_link_hash_entry *) *slot;
880 ret = (struct elf_x86_64_link_hash_entry *)
881 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
882 sizeof (struct elf_x86_64_link_hash_entry));
885 memset (ret, 0, sizeof (*ret));
886 ret->elf.indx = sec->id;
887 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
888 ret->elf.dynindx = -1;
894 /* Create an X86-64 ELF linker hash table. */
896 static struct bfd_link_hash_table *
897 elf_x86_64_link_hash_table_create (bfd *abfd)
899 struct elf_x86_64_link_hash_table *ret;
900 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
902 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
906 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
907 elf_x86_64_link_hash_newfunc,
908 sizeof (struct elf_x86_64_link_hash_entry),
917 ret->r_info = elf64_r_info;
918 ret->r_sym = elf64_r_sym;
919 ret->pointer_r_type = R_X86_64_64;
920 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
921 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
925 ret->r_info = elf32_r_info;
926 ret->r_sym = elf32_r_sym;
927 ret->pointer_r_type = R_X86_64_32;
928 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
929 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
932 ret->loc_hash_table = htab_try_create (1024,
933 elf_x86_64_local_htab_hash,
934 elf_x86_64_local_htab_eq,
936 ret->loc_hash_memory = objalloc_create ();
937 if (!ret->loc_hash_table || !ret->loc_hash_memory)
943 return &ret->elf.root;
946 /* Destroy an X86-64 ELF linker hash table. */
949 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
951 struct elf_x86_64_link_hash_table *htab
952 = (struct elf_x86_64_link_hash_table *) hash;
954 if (htab->loc_hash_table)
955 htab_delete (htab->loc_hash_table);
956 if (htab->loc_hash_memory)
957 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
958 _bfd_elf_link_hash_table_free (hash);
961 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
962 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
966 elf_x86_64_create_dynamic_sections (bfd *dynobj,
967 struct bfd_link_info *info)
969 struct elf_x86_64_link_hash_table *htab;
971 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
974 htab = elf_x86_64_hash_table (info);
978 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
980 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
983 || (!info->shared && !htab->srelbss))
986 if (!info->no_ld_generated_unwind_info
987 && htab->plt_eh_frame == NULL
988 && htab->elf.splt != NULL)
990 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
991 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
992 | SEC_LINKER_CREATED);
994 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
995 if (htab->plt_eh_frame == NULL
996 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
1002 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1005 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1006 struct elf_link_hash_entry *dir,
1007 struct elf_link_hash_entry *ind)
1009 struct elf_x86_64_link_hash_entry *edir, *eind;
1011 edir = (struct elf_x86_64_link_hash_entry *) dir;
1012 eind = (struct elf_x86_64_link_hash_entry *) ind;
1014 if (eind->dyn_relocs != NULL)
1016 if (edir->dyn_relocs != NULL)
1018 struct elf_dyn_relocs **pp;
1019 struct elf_dyn_relocs *p;
1021 /* Add reloc counts against the indirect sym to the direct sym
1022 list. Merge any entries against the same section. */
1023 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1025 struct elf_dyn_relocs *q;
1027 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1028 if (q->sec == p->sec)
1030 q->pc_count += p->pc_count;
1031 q->count += p->count;
1038 *pp = edir->dyn_relocs;
1041 edir->dyn_relocs = eind->dyn_relocs;
1042 eind->dyn_relocs = NULL;
1045 if (ind->root.type == bfd_link_hash_indirect
1046 && dir->got.refcount <= 0)
1048 edir->tls_type = eind->tls_type;
1049 eind->tls_type = GOT_UNKNOWN;
1052 if (ELIMINATE_COPY_RELOCS
1053 && ind->root.type != bfd_link_hash_indirect
1054 && dir->dynamic_adjusted)
1056 /* If called to transfer flags for a weakdef during processing
1057 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1058 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1059 dir->ref_dynamic |= ind->ref_dynamic;
1060 dir->ref_regular |= ind->ref_regular;
1061 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1062 dir->needs_plt |= ind->needs_plt;
1063 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1066 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1070 elf64_x86_64_elf_object_p (bfd *abfd)
1072 /* Set the right machine number for an x86-64 elf64 file. */
1073 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1078 elf32_x86_64_elf_object_p (bfd *abfd)
1080 /* Set the right machine number for an x86-64 elf32 file. */
1081 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1085 /* Return TRUE if the TLS access code sequence support transition
1089 elf_x86_64_check_tls_transition (bfd *abfd,
1090 struct bfd_link_info *info,
1093 Elf_Internal_Shdr *symtab_hdr,
1094 struct elf_link_hash_entry **sym_hashes,
1095 unsigned int r_type,
1096 const Elf_Internal_Rela *rel,
1097 const Elf_Internal_Rela *relend)
1100 unsigned long r_symndx;
1101 bfd_boolean largepic = FALSE;
1102 struct elf_link_hash_entry *h;
1104 struct elf_x86_64_link_hash_table *htab;
1106 /* Get the section contents. */
1107 if (contents == NULL)
1109 if (elf_section_data (sec)->this_hdr.contents != NULL)
1110 contents = elf_section_data (sec)->this_hdr.contents;
1113 /* FIXME: How to better handle error condition? */
1114 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1117 /* Cache the section contents for elf_link_input_bfd. */
1118 elf_section_data (sec)->this_hdr.contents = contents;
1122 htab = elf_x86_64_hash_table (info);
1123 offset = rel->r_offset;
1126 case R_X86_64_TLSGD:
1127 case R_X86_64_TLSLD:
1128 if ((rel + 1) >= relend)
1131 if (r_type == R_X86_64_TLSGD)
1133 /* Check transition from GD access model. For 64bit, only
1134 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1135 .word 0x6666; rex64; call __tls_get_addr
1136 can transit to different access model. For 32bit, only
1137 leaq foo@tlsgd(%rip), %rdi
1138 .word 0x6666; rex64; call __tls_get_addr
1139 can transit to different access model. For largepic
1141 leaq foo@tlsgd(%rip), %rdi
1142 movabsq $__tls_get_addr@pltoff, %rax
1146 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1147 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1149 if ((offset + 12) > sec->size)
1152 if (memcmp (contents + offset + 4, call, 4) != 0)
1154 if (!ABI_64_P (abfd)
1155 || (offset + 19) > sec->size
1157 || memcmp (contents + offset - 3, leaq + 1, 3) != 0
1158 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1159 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1164 else if (ABI_64_P (abfd))
1167 || memcmp (contents + offset - 4, leaq, 4) != 0)
1173 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1179 /* Check transition from LD access model. Only
1180 leaq foo@tlsld(%rip), %rdi;
1182 can transit to different access model. For largepic
1184 leaq foo@tlsld(%rip), %rdi
1185 movabsq $__tls_get_addr@pltoff, %rax
1189 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1191 if (offset < 3 || (offset + 9) > sec->size)
1194 if (memcmp (contents + offset - 3, lea, 3) != 0)
1197 if (0xe8 != *(contents + offset + 4))
1199 if (!ABI_64_P (abfd)
1200 || (offset + 19) > sec->size
1201 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1202 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1209 r_symndx = htab->r_sym (rel[1].r_info);
1210 if (r_symndx < symtab_hdr->sh_info)
1213 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1214 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1215 may be versioned. */
1217 && h->root.root.string != NULL
1219 ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64
1220 : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1221 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32))
1222 && (strncmp (h->root.root.string,
1223 "__tls_get_addr", 14) == 0));
1225 case R_X86_64_GOTTPOFF:
1226 /* Check transition from IE access model:
1227 mov foo@gottpoff(%rip), %reg
1228 add foo@gottpoff(%rip), %reg
1231 /* Check REX prefix first. */
1232 if (offset >= 3 && (offset + 4) <= sec->size)
1234 val = bfd_get_8 (abfd, contents + offset - 3);
1235 if (val != 0x48 && val != 0x4c)
1237 /* X32 may have 0x44 REX prefix or no REX prefix. */
1238 if (ABI_64_P (abfd))
1244 /* X32 may not have any REX prefix. */
1245 if (ABI_64_P (abfd))
1247 if (offset < 2 || (offset + 3) > sec->size)
1251 val = bfd_get_8 (abfd, contents + offset - 2);
1252 if (val != 0x8b && val != 0x03)
1255 val = bfd_get_8 (abfd, contents + offset - 1);
1256 return (val & 0xc7) == 5;
1258 case R_X86_64_GOTPC32_TLSDESC:
1259 /* Check transition from GDesc access model:
1260 leaq x@tlsdesc(%rip), %rax
1262 Make sure it's a leaq adding rip to a 32-bit offset
1263 into any register, although it's probably almost always
1266 if (offset < 3 || (offset + 4) > sec->size)
1269 val = bfd_get_8 (abfd, contents + offset - 3);
1270 if ((val & 0xfb) != 0x48)
1273 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1276 val = bfd_get_8 (abfd, contents + offset - 1);
1277 return (val & 0xc7) == 0x05;
1279 case R_X86_64_TLSDESC_CALL:
1280 /* Check transition from GDesc access model:
1281 call *x@tlsdesc(%rax)
1283 if (offset + 2 <= sec->size)
1285 /* Make sure that it's a call *x@tlsdesc(%rax). */
1286 static const unsigned char call[] = { 0xff, 0x10 };
1287 return memcmp (contents + offset, call, 2) == 0;
1297 /* Return TRUE if the TLS access transition is OK or no transition
1298 will be performed. Update R_TYPE if there is a transition. */
1301 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1302 asection *sec, bfd_byte *contents,
1303 Elf_Internal_Shdr *symtab_hdr,
1304 struct elf_link_hash_entry **sym_hashes,
1305 unsigned int *r_type, int tls_type,
1306 const Elf_Internal_Rela *rel,
1307 const Elf_Internal_Rela *relend,
1308 struct elf_link_hash_entry *h,
1309 unsigned long r_symndx)
1311 unsigned int from_type = *r_type;
1312 unsigned int to_type = from_type;
1313 bfd_boolean check = TRUE;
1315 /* Skip TLS transition for functions. */
1317 && (h->type == STT_FUNC
1318 || h->type == STT_GNU_IFUNC))
1323 case R_X86_64_TLSGD:
1324 case R_X86_64_GOTPC32_TLSDESC:
1325 case R_X86_64_TLSDESC_CALL:
1326 case R_X86_64_GOTTPOFF:
1327 if (info->executable)
1330 to_type = R_X86_64_TPOFF32;
1332 to_type = R_X86_64_GOTTPOFF;
1335 /* When we are called from elf_x86_64_relocate_section,
1336 CONTENTS isn't NULL and there may be additional transitions
1337 based on TLS_TYPE. */
1338 if (contents != NULL)
1340 unsigned int new_to_type = to_type;
1342 if (info->executable
1345 && tls_type == GOT_TLS_IE)
1346 new_to_type = R_X86_64_TPOFF32;
1348 if (to_type == R_X86_64_TLSGD
1349 || to_type == R_X86_64_GOTPC32_TLSDESC
1350 || to_type == R_X86_64_TLSDESC_CALL)
1352 if (tls_type == GOT_TLS_IE)
1353 new_to_type = R_X86_64_GOTTPOFF;
1356 /* We checked the transition before when we were called from
1357 elf_x86_64_check_relocs. We only want to check the new
1358 transition which hasn't been checked before. */
1359 check = new_to_type != to_type && from_type == to_type;
1360 to_type = new_to_type;
1365 case R_X86_64_TLSLD:
1366 if (info->executable)
1367 to_type = R_X86_64_TPOFF32;
1374 /* Return TRUE if there is no transition. */
1375 if (from_type == to_type)
1378 /* Check if the transition can be performed. */
1380 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1381 symtab_hdr, sym_hashes,
1382 from_type, rel, relend))
1384 reloc_howto_type *from, *to;
1387 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1388 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1391 name = h->root.root.string;
1394 struct elf_x86_64_link_hash_table *htab;
1396 htab = elf_x86_64_hash_table (info);
1401 Elf_Internal_Sym *isym;
1403 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1405 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1409 (*_bfd_error_handler)
1410 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1411 "in section `%A' failed"),
1412 abfd, sec, from->name, to->name, name,
1413 (unsigned long) rel->r_offset);
1414 bfd_set_error (bfd_error_bad_value);
1422 /* Look through the relocs for a section during the first phase, and
1423 calculate needed space in the global offset table, procedure
1424 linkage table, and dynamic reloc sections. */
1427 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1429 const Elf_Internal_Rela *relocs)
1431 struct elf_x86_64_link_hash_table *htab;
1432 Elf_Internal_Shdr *symtab_hdr;
1433 struct elf_link_hash_entry **sym_hashes;
1434 const Elf_Internal_Rela *rel;
1435 const Elf_Internal_Rela *rel_end;
1438 if (info->relocatable)
1441 BFD_ASSERT (is_x86_64_elf (abfd));
1443 htab = elf_x86_64_hash_table (info);
1447 symtab_hdr = &elf_symtab_hdr (abfd);
1448 sym_hashes = elf_sym_hashes (abfd);
1452 rel_end = relocs + sec->reloc_count;
1453 for (rel = relocs; rel < rel_end; rel++)
1455 unsigned int r_type;
1456 unsigned long r_symndx;
1457 struct elf_link_hash_entry *h;
1458 Elf_Internal_Sym *isym;
1460 bfd_boolean size_reloc;
1462 r_symndx = htab->r_sym (rel->r_info);
1463 r_type = ELF32_R_TYPE (rel->r_info);
1465 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1467 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1472 if (r_symndx < symtab_hdr->sh_info)
1474 /* A local symbol. */
1475 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1480 /* Check relocation against local STT_GNU_IFUNC symbol. */
1481 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1483 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1488 /* Fake a STT_GNU_IFUNC symbol. */
1489 h->type = STT_GNU_IFUNC;
1492 h->forced_local = 1;
1493 h->root.type = bfd_link_hash_defined;
1501 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1502 while (h->root.type == bfd_link_hash_indirect
1503 || h->root.type == bfd_link_hash_warning)
1504 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1507 /* Check invalid x32 relocations. */
1508 if (!ABI_64_P (abfd))
1514 case R_X86_64_DTPOFF64:
1515 case R_X86_64_TPOFF64:
1517 case R_X86_64_GOTOFF64:
1518 case R_X86_64_GOT64:
1519 case R_X86_64_GOTPCREL64:
1520 case R_X86_64_GOTPC64:
1521 case R_X86_64_GOTPLT64:
1522 case R_X86_64_PLTOFF64:
1525 name = h->root.root.string;
1527 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1529 (*_bfd_error_handler)
1530 (_("%B: relocation %s against symbol `%s' isn't "
1531 "supported in x32 mode"), abfd,
1532 x86_64_elf_howto_table[r_type].name, name);
1533 bfd_set_error (bfd_error_bad_value);
1541 /* Create the ifunc sections for static executables. If we
1542 never see an indirect function symbol nor we are building
1543 a static executable, those sections will be empty and
1544 won't appear in output. */
1554 case R_X86_64_PC32_BND:
1556 case R_X86_64_PLT32:
1557 case R_X86_64_PLT32_BND:
1558 case R_X86_64_GOTPCREL:
1559 case R_X86_64_GOTPCREL64:
1560 if (htab->elf.dynobj == NULL)
1561 htab->elf.dynobj = abfd;
1562 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1567 /* It is referenced by a non-shared object. */
1569 h->root.non_ir_ref = 1;
1572 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1573 symtab_hdr, sym_hashes,
1574 &r_type, GOT_UNKNOWN,
1575 rel, rel_end, h, r_symndx))
1580 case R_X86_64_TLSLD:
1581 htab->tls_ld_got.refcount += 1;
1584 case R_X86_64_TPOFF32:
1585 if (!info->executable && ABI_64_P (abfd))
1588 name = h->root.root.string;
1590 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1592 (*_bfd_error_handler)
1593 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1595 x86_64_elf_howto_table[r_type].name, name);
1596 bfd_set_error (bfd_error_bad_value);
1601 case R_X86_64_GOTTPOFF:
1602 if (!info->executable)
1603 info->flags |= DF_STATIC_TLS;
1606 case R_X86_64_GOT32:
1607 case R_X86_64_GOTPCREL:
1608 case R_X86_64_TLSGD:
1609 case R_X86_64_GOT64:
1610 case R_X86_64_GOTPCREL64:
1611 case R_X86_64_GOTPLT64:
1612 case R_X86_64_GOTPC32_TLSDESC:
1613 case R_X86_64_TLSDESC_CALL:
1614 /* This symbol requires a global offset table entry. */
1616 int tls_type, old_tls_type;
1620 default: tls_type = GOT_NORMAL; break;
1621 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1622 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1623 case R_X86_64_GOTPC32_TLSDESC:
1624 case R_X86_64_TLSDESC_CALL:
1625 tls_type = GOT_TLS_GDESC; break;
1630 if (r_type == R_X86_64_GOTPLT64)
1632 /* This relocation indicates that we also need
1633 a PLT entry, as this is a function. We don't need
1634 a PLT entry for local symbols. */
1636 h->plt.refcount += 1;
1638 h->got.refcount += 1;
1639 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1643 bfd_signed_vma *local_got_refcounts;
1645 /* This is a global offset table entry for a local symbol. */
1646 local_got_refcounts = elf_local_got_refcounts (abfd);
1647 if (local_got_refcounts == NULL)
1651 size = symtab_hdr->sh_info;
1652 size *= sizeof (bfd_signed_vma)
1653 + sizeof (bfd_vma) + sizeof (char);
1654 local_got_refcounts = ((bfd_signed_vma *)
1655 bfd_zalloc (abfd, size));
1656 if (local_got_refcounts == NULL)
1658 elf_local_got_refcounts (abfd) = local_got_refcounts;
1659 elf_x86_64_local_tlsdesc_gotent (abfd)
1660 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1661 elf_x86_64_local_got_tls_type (abfd)
1662 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1664 local_got_refcounts[r_symndx] += 1;
1666 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1669 /* If a TLS symbol is accessed using IE at least once,
1670 there is no point to use dynamic model for it. */
1671 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1672 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1673 || tls_type != GOT_TLS_IE))
1675 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1676 tls_type = old_tls_type;
1677 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1678 && GOT_TLS_GD_ANY_P (tls_type))
1679 tls_type |= old_tls_type;
1683 name = h->root.root.string;
1685 name = bfd_elf_sym_name (abfd, symtab_hdr,
1687 (*_bfd_error_handler)
1688 (_("%B: '%s' accessed both as normal and thread local symbol"),
1690 bfd_set_error (bfd_error_bad_value);
1695 if (old_tls_type != tls_type)
1698 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1700 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1705 case R_X86_64_GOTOFF64:
1706 case R_X86_64_GOTPC32:
1707 case R_X86_64_GOTPC64:
1709 if (htab->elf.sgot == NULL)
1711 if (htab->elf.dynobj == NULL)
1712 htab->elf.dynobj = abfd;
1713 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1719 case R_X86_64_PLT32:
1720 case R_X86_64_PLT32_BND:
1721 /* This symbol requires a procedure linkage table entry. We
1722 actually build the entry in adjust_dynamic_symbol,
1723 because this might be a case of linking PIC code which is
1724 never referenced by a dynamic object, in which case we
1725 don't need to generate a procedure linkage table entry
1728 /* If this is a local symbol, we resolve it directly without
1729 creating a procedure linkage table entry. */
1734 h->plt.refcount += 1;
1737 case R_X86_64_PLTOFF64:
1738 /* This tries to form the 'address' of a function relative
1739 to GOT. For global symbols we need a PLT entry. */
1743 h->plt.refcount += 1;
1747 case R_X86_64_SIZE32:
1748 case R_X86_64_SIZE64:
1753 if (!ABI_64_P (abfd))
1758 /* Let's help debug shared library creation. These relocs
1759 cannot be used in shared libs. Don't error out for
1760 sections we don't care about, such as debug sections or
1761 non-constant sections. */
1763 && (sec->flags & SEC_ALLOC) != 0
1764 && (sec->flags & SEC_READONLY) != 0)
1767 name = h->root.root.string;
1769 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1770 (*_bfd_error_handler)
1771 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1772 abfd, x86_64_elf_howto_table[r_type].name, name);
1773 bfd_set_error (bfd_error_bad_value);
1781 case R_X86_64_PC32_BND:
1785 if (h != NULL && info->executable)
1787 /* If this reloc is in a read-only section, we might
1788 need a copy reloc. We can't check reliably at this
1789 stage whether the section is read-only, as input
1790 sections have not yet been mapped to output sections.
1791 Tentatively set the flag for now, and correct in
1792 adjust_dynamic_symbol. */
1795 /* We may need a .plt entry if the function this reloc
1796 refers to is in a shared lib. */
1797 h->plt.refcount += 1;
1798 if (r_type != R_X86_64_PC32
1799 && r_type != R_X86_64_PC32_BND
1800 && r_type != R_X86_64_PC64)
1801 h->pointer_equality_needed = 1;
1806 /* If we are creating a shared library, and this is a reloc
1807 against a global symbol, or a non PC relative reloc
1808 against a local symbol, then we need to copy the reloc
1809 into the shared library. However, if we are linking with
1810 -Bsymbolic, we do not need to copy a reloc against a
1811 global symbol which is defined in an object we are
1812 including in the link (i.e., DEF_REGULAR is set). At
1813 this point we have not seen all the input files, so it is
1814 possible that DEF_REGULAR is not set now but will be set
1815 later (it is never cleared). In case of a weak definition,
1816 DEF_REGULAR may be cleared later by a strong definition in
1817 a shared library. We account for that possibility below by
1818 storing information in the relocs_copied field of the hash
1819 table entry. A similar situation occurs when creating
1820 shared libraries and symbol visibility changes render the
1823 If on the other hand, we are creating an executable, we
1824 may need to keep relocations for symbols satisfied by a
1825 dynamic library if we manage to avoid copy relocs for the
1828 && (sec->flags & SEC_ALLOC) != 0
1829 && (! IS_X86_64_PCREL_TYPE (r_type)
1831 && (! SYMBOLIC_BIND (info, h)
1832 || h->root.type == bfd_link_hash_defweak
1833 || !h->def_regular))))
1834 || (ELIMINATE_COPY_RELOCS
1836 && (sec->flags & SEC_ALLOC) != 0
1838 && (h->root.type == bfd_link_hash_defweak
1839 || !h->def_regular)))
1841 struct elf_dyn_relocs *p;
1842 struct elf_dyn_relocs **head;
1844 /* We must copy these reloc types into the output file.
1845 Create a reloc section in dynobj and make room for
1849 if (htab->elf.dynobj == NULL)
1850 htab->elf.dynobj = abfd;
1852 sreloc = _bfd_elf_make_dynamic_reloc_section
1853 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1854 abfd, /*rela?*/ TRUE);
1860 /* If this is a global symbol, we count the number of
1861 relocations we need for this symbol. */
1864 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
1868 /* Track dynamic relocs needed for local syms too.
1869 We really need local syms available to do this
1874 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1879 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1883 /* Beware of type punned pointers vs strict aliasing
1885 vpp = &(elf_section_data (s)->local_dynrel);
1886 head = (struct elf_dyn_relocs **)vpp;
1890 if (p == NULL || p->sec != sec)
1892 bfd_size_type amt = sizeof *p;
1894 p = ((struct elf_dyn_relocs *)
1895 bfd_alloc (htab->elf.dynobj, amt));
1906 /* Count size relocation as PC-relative relocation. */
1907 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
1912 /* This relocation describes the C++ object vtable hierarchy.
1913 Reconstruct it for later use during GC. */
1914 case R_X86_64_GNU_VTINHERIT:
1915 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1919 /* This relocation describes which C++ vtable entries are actually
1920 used. Record for later use during GC. */
1921 case R_X86_64_GNU_VTENTRY:
1922 BFD_ASSERT (h != NULL);
1924 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1936 /* Return the section that should be marked against GC for a given
1940 elf_x86_64_gc_mark_hook (asection *sec,
1941 struct bfd_link_info *info,
1942 Elf_Internal_Rela *rel,
1943 struct elf_link_hash_entry *h,
1944 Elf_Internal_Sym *sym)
1947 switch (ELF32_R_TYPE (rel->r_info))
1949 case R_X86_64_GNU_VTINHERIT:
1950 case R_X86_64_GNU_VTENTRY:
1954 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1957 /* Update the got entry reference counts for the section being removed. */
1960 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1962 const Elf_Internal_Rela *relocs)
1964 struct elf_x86_64_link_hash_table *htab;
1965 Elf_Internal_Shdr *symtab_hdr;
1966 struct elf_link_hash_entry **sym_hashes;
1967 bfd_signed_vma *local_got_refcounts;
1968 const Elf_Internal_Rela *rel, *relend;
1970 if (info->relocatable)
1973 htab = elf_x86_64_hash_table (info);
1977 elf_section_data (sec)->local_dynrel = NULL;
1979 symtab_hdr = &elf_symtab_hdr (abfd);
1980 sym_hashes = elf_sym_hashes (abfd);
1981 local_got_refcounts = elf_local_got_refcounts (abfd);
1983 htab = elf_x86_64_hash_table (info);
1984 relend = relocs + sec->reloc_count;
1985 for (rel = relocs; rel < relend; rel++)
1987 unsigned long r_symndx;
1988 unsigned int r_type;
1989 struct elf_link_hash_entry *h = NULL;
1991 r_symndx = htab->r_sym (rel->r_info);
1992 if (r_symndx >= symtab_hdr->sh_info)
1994 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1995 while (h->root.type == bfd_link_hash_indirect
1996 || h->root.type == bfd_link_hash_warning)
1997 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2001 /* A local symbol. */
2002 Elf_Internal_Sym *isym;
2004 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2007 /* Check relocation against local STT_GNU_IFUNC symbol. */
2009 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2011 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2019 struct elf_x86_64_link_hash_entry *eh;
2020 struct elf_dyn_relocs **pp;
2021 struct elf_dyn_relocs *p;
2023 eh = (struct elf_x86_64_link_hash_entry *) h;
2025 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2028 /* Everything must go for SEC. */
2034 r_type = ELF32_R_TYPE (rel->r_info);
2035 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2036 symtab_hdr, sym_hashes,
2037 &r_type, GOT_UNKNOWN,
2038 rel, relend, h, r_symndx))
2043 case R_X86_64_TLSLD:
2044 if (htab->tls_ld_got.refcount > 0)
2045 htab->tls_ld_got.refcount -= 1;
2048 case R_X86_64_TLSGD:
2049 case R_X86_64_GOTPC32_TLSDESC:
2050 case R_X86_64_TLSDESC_CALL:
2051 case R_X86_64_GOTTPOFF:
2052 case R_X86_64_GOT32:
2053 case R_X86_64_GOTPCREL:
2054 case R_X86_64_GOT64:
2055 case R_X86_64_GOTPCREL64:
2056 case R_X86_64_GOTPLT64:
2059 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
2060 h->plt.refcount -= 1;
2061 if (h->got.refcount > 0)
2062 h->got.refcount -= 1;
2063 if (h->type == STT_GNU_IFUNC)
2065 if (h->plt.refcount > 0)
2066 h->plt.refcount -= 1;
2069 else if (local_got_refcounts != NULL)
2071 if (local_got_refcounts[r_symndx] > 0)
2072 local_got_refcounts[r_symndx] -= 1;
2084 case R_X86_64_PC32_BND:
2086 case R_X86_64_SIZE32:
2087 case R_X86_64_SIZE64:
2089 && (h == NULL || h->type != STT_GNU_IFUNC))
2093 case R_X86_64_PLT32:
2094 case R_X86_64_PLT32_BND:
2095 case R_X86_64_PLTOFF64:
2098 if (h->plt.refcount > 0)
2099 h->plt.refcount -= 1;
2111 /* Adjust a symbol defined by a dynamic object and referenced by a
2112 regular object. The current definition is in some section of the
2113 dynamic object, but we're not including those sections. We have to
2114 change the definition to something the rest of the link can
2118 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2119 struct elf_link_hash_entry *h)
2121 struct elf_x86_64_link_hash_table *htab;
2123 struct elf_x86_64_link_hash_entry *eh;
2124 struct elf_dyn_relocs *p;
2126 /* STT_GNU_IFUNC symbol must go through PLT. */
2127 if (h->type == STT_GNU_IFUNC)
2129 /* All local STT_GNU_IFUNC references must be treate as local
2130 calls via local PLT. */
2132 && SYMBOL_CALLS_LOCAL (info, h))
2134 bfd_size_type pc_count = 0, count = 0;
2135 struct elf_dyn_relocs **pp;
2137 eh = (struct elf_x86_64_link_hash_entry *) h;
2138 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2140 pc_count += p->pc_count;
2141 p->count -= p->pc_count;
2150 if (pc_count || count)
2154 if (h->plt.refcount <= 0)
2155 h->plt.refcount = 1;
2157 h->plt.refcount += 1;
2161 if (h->plt.refcount <= 0)
2163 h->plt.offset = (bfd_vma) -1;
2169 /* If this is a function, put it in the procedure linkage table. We
2170 will fill in the contents of the procedure linkage table later,
2171 when we know the address of the .got section. */
2172 if (h->type == STT_FUNC
2175 if (h->plt.refcount <= 0
2176 || SYMBOL_CALLS_LOCAL (info, h)
2177 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2178 && h->root.type == bfd_link_hash_undefweak))
2180 /* This case can occur if we saw a PLT32 reloc in an input
2181 file, but the symbol was never referred to by a dynamic
2182 object, or if all references were garbage collected. In
2183 such a case, we don't actually need to build a procedure
2184 linkage table, and we can just do a PC32 reloc instead. */
2185 h->plt.offset = (bfd_vma) -1;
2192 /* It's possible that we incorrectly decided a .plt reloc was
2193 needed for an R_X86_64_PC32 reloc to a non-function sym in
2194 check_relocs. We can't decide accurately between function and
2195 non-function syms in check-relocs; Objects loaded later in
2196 the link may change h->type. So fix it now. */
2197 h->plt.offset = (bfd_vma) -1;
2199 /* If this is a weak symbol, and there is a real definition, the
2200 processor independent code will have arranged for us to see the
2201 real definition first, and we can just use the same value. */
2202 if (h->u.weakdef != NULL)
2204 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2205 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2206 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2207 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2208 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2209 h->non_got_ref = h->u.weakdef->non_got_ref;
2213 /* This is a reference to a symbol defined by a dynamic object which
2214 is not a function. */
2216 /* If we are creating a shared library, we must presume that the
2217 only references to the symbol are via the global offset table.
2218 For such cases we need not do anything here; the relocations will
2219 be handled correctly by relocate_section. */
2223 /* If there are no references to this symbol that do not use the
2224 GOT, we don't need to generate a copy reloc. */
2225 if (!h->non_got_ref)
2228 /* If -z nocopyreloc was given, we won't generate them either. */
2229 if (info->nocopyreloc)
2235 if (ELIMINATE_COPY_RELOCS)
2237 eh = (struct elf_x86_64_link_hash_entry *) h;
2238 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2240 s = p->sec->output_section;
2241 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2245 /* If we didn't find any dynamic relocs in read-only sections, then
2246 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2254 /* We must allocate the symbol in our .dynbss section, which will
2255 become part of the .bss section of the executable. There will be
2256 an entry for this symbol in the .dynsym section. The dynamic
2257 object will contain position independent code, so all references
2258 from the dynamic object to this symbol will go through the global
2259 offset table. The dynamic linker will use the .dynsym entry to
2260 determine the address it must put in the global offset table, so
2261 both the dynamic object and the regular object will refer to the
2262 same memory location for the variable. */
2264 htab = elf_x86_64_hash_table (info);
2268 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2269 to copy the initial value out of the dynamic object and into the
2270 runtime process image. */
2271 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2273 const struct elf_backend_data *bed;
2274 bed = get_elf_backend_data (info->output_bfd);
2275 htab->srelbss->size += bed->s->sizeof_rela;
2281 return _bfd_elf_adjust_dynamic_copy (h, s);
2284 /* Allocate space in .plt, .got and associated reloc sections for
2288 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2290 struct bfd_link_info *info;
2291 struct elf_x86_64_link_hash_table *htab;
2292 struct elf_x86_64_link_hash_entry *eh;
2293 struct elf_dyn_relocs *p;
2294 const struct elf_backend_data *bed;
2295 unsigned int plt_entry_size;
2297 if (h->root.type == bfd_link_hash_indirect)
2300 eh = (struct elf_x86_64_link_hash_entry *) h;
2302 info = (struct bfd_link_info *) inf;
2303 htab = elf_x86_64_hash_table (info);
2306 bed = get_elf_backend_data (info->output_bfd);
2307 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2309 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2310 here if it is defined and referenced in a non-shared object. */
2311 if (h->type == STT_GNU_IFUNC
2313 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2318 else if (htab->elf.dynamic_sections_created
2319 && h->plt.refcount > 0)
2321 /* Make sure this symbol is output as a dynamic symbol.
2322 Undefined weak syms won't yet be marked as dynamic. */
2323 if (h->dynindx == -1
2324 && !h->forced_local)
2326 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2331 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2333 asection *s = htab->elf.splt;
2335 /* If this is the first .plt entry, make room for the special
2338 s->size = plt_entry_size;
2340 h->plt.offset = s->size;
2342 /* If this symbol is not defined in a regular file, and we are
2343 not generating a shared library, then set the symbol to this
2344 location in the .plt. This is required to make function
2345 pointers compare as equal between the normal executable and
2346 the shared library. */
2350 h->root.u.def.section = s;
2351 h->root.u.def.value = h->plt.offset;
2354 /* Make room for this entry. */
2355 s->size += plt_entry_size;
2357 /* We also need to make an entry in the .got.plt section, which
2358 will be placed in the .got section by the linker script. */
2359 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2361 /* We also need to make an entry in the .rela.plt section. */
2362 htab->elf.srelplt->size += bed->s->sizeof_rela;
2363 htab->elf.srelplt->reloc_count++;
2367 h->plt.offset = (bfd_vma) -1;
2373 h->plt.offset = (bfd_vma) -1;
2377 eh->tlsdesc_got = (bfd_vma) -1;
2379 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2380 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2381 if (h->got.refcount > 0
2384 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2386 h->got.offset = (bfd_vma) -1;
2388 else if (h->got.refcount > 0)
2392 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2394 /* Make sure this symbol is output as a dynamic symbol.
2395 Undefined weak syms won't yet be marked as dynamic. */
2396 if (h->dynindx == -1
2397 && !h->forced_local)
2399 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2403 if (GOT_TLS_GDESC_P (tls_type))
2405 eh->tlsdesc_got = htab->elf.sgotplt->size
2406 - elf_x86_64_compute_jump_table_size (htab);
2407 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2408 h->got.offset = (bfd_vma) -2;
2410 if (! GOT_TLS_GDESC_P (tls_type)
2411 || GOT_TLS_GD_P (tls_type))
2414 h->got.offset = s->size;
2415 s->size += GOT_ENTRY_SIZE;
2416 if (GOT_TLS_GD_P (tls_type))
2417 s->size += GOT_ENTRY_SIZE;
2419 dyn = htab->elf.dynamic_sections_created;
2420 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2422 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2423 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2424 || tls_type == GOT_TLS_IE)
2425 htab->elf.srelgot->size += bed->s->sizeof_rela;
2426 else if (GOT_TLS_GD_P (tls_type))
2427 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2428 else if (! GOT_TLS_GDESC_P (tls_type)
2429 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2430 || h->root.type != bfd_link_hash_undefweak)
2432 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2433 htab->elf.srelgot->size += bed->s->sizeof_rela;
2434 if (GOT_TLS_GDESC_P (tls_type))
2436 htab->elf.srelplt->size += bed->s->sizeof_rela;
2437 htab->tlsdesc_plt = (bfd_vma) -1;
2441 h->got.offset = (bfd_vma) -1;
2443 if (eh->dyn_relocs == NULL)
2446 /* In the shared -Bsymbolic case, discard space allocated for
2447 dynamic pc-relative relocs against symbols which turn out to be
2448 defined in regular objects. For the normal shared case, discard
2449 space for pc-relative relocs that have become local due to symbol
2450 visibility changes. */
2454 /* Relocs that use pc_count are those that appear on a call
2455 insn, or certain REL relocs that can generated via assembly.
2456 We want calls to protected symbols to resolve directly to the
2457 function rather than going via the plt. If people want
2458 function pointer comparisons to work as expected then they
2459 should avoid writing weird assembly. */
2460 if (SYMBOL_CALLS_LOCAL (info, h))
2462 struct elf_dyn_relocs **pp;
2464 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2466 /* Don't update reloc count if there are any non
2467 pc-relative relocs. */
2468 if (!h->pointer_equality_needed)
2470 p->count -= p->pc_count;
2480 /* Also discard relocs on undefined weak syms with non-default
2482 if (eh->dyn_relocs != NULL
2483 && h->root.type == bfd_link_hash_undefweak)
2485 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2486 eh->dyn_relocs = NULL;
2488 /* Make sure undefined weak symbols are output as a dynamic
2490 else if (h->dynindx == -1
2491 && ! h->forced_local
2492 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2497 else if (ELIMINATE_COPY_RELOCS)
2499 /* For the non-shared case, discard space for relocs against
2500 symbols which turn out to need copy relocs or are not
2506 || (htab->elf.dynamic_sections_created
2507 && (h->root.type == bfd_link_hash_undefweak
2508 || h->root.type == bfd_link_hash_undefined))))
2510 /* Make sure this symbol is output as a dynamic symbol.
2511 Undefined weak syms won't yet be marked as dynamic. */
2512 if (h->dynindx == -1
2513 && ! h->forced_local
2514 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2517 /* If that succeeded, we know we'll be keeping all the
2519 if (h->dynindx != -1)
2523 eh->dyn_relocs = NULL;
2528 /* Finally, allocate space. */
2529 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2533 sreloc = elf_section_data (p->sec)->sreloc;
2535 BFD_ASSERT (sreloc != NULL);
2537 sreloc->size += p->count * bed->s->sizeof_rela;
2543 /* Allocate space in .plt, .got and associated reloc sections for
2544 local dynamic relocs. */
2547 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2549 struct elf_link_hash_entry *h
2550 = (struct elf_link_hash_entry *) *slot;
2552 if (h->type != STT_GNU_IFUNC
2556 || h->root.type != bfd_link_hash_defined)
2559 return elf_x86_64_allocate_dynrelocs (h, inf);
2562 /* Find any dynamic relocs that apply to read-only sections. */
2565 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2568 struct elf_x86_64_link_hash_entry *eh;
2569 struct elf_dyn_relocs *p;
2571 /* Skip local IFUNC symbols. */
2572 if (h->forced_local && h->type == STT_GNU_IFUNC)
2575 eh = (struct elf_x86_64_link_hash_entry *) h;
2576 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2578 asection *s = p->sec->output_section;
2580 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2582 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2584 info->flags |= DF_TEXTREL;
2586 if (info->warn_shared_textrel && info->shared)
2587 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2588 p->sec->owner, h->root.root.string,
2591 /* Not an error, just cut short the traversal. */
2599 mov foo@GOTPCREL(%rip), %reg
2602 with the local symbol, foo. */
2605 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2606 struct bfd_link_info *link_info)
2608 Elf_Internal_Shdr *symtab_hdr;
2609 Elf_Internal_Rela *internal_relocs;
2610 Elf_Internal_Rela *irel, *irelend;
2612 struct elf_x86_64_link_hash_table *htab;
2613 bfd_boolean changed_contents;
2614 bfd_boolean changed_relocs;
2615 bfd_signed_vma *local_got_refcounts;
2617 /* Don't even try to convert non-ELF outputs. */
2618 if (!is_elf_hash_table (link_info->hash))
2621 /* Nothing to do if there are no codes, no relocations or no output. */
2622 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2623 || sec->reloc_count == 0
2624 || discarded_section (sec))
2627 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2629 /* Load the relocations for this section. */
2630 internal_relocs = (_bfd_elf_link_read_relocs
2631 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2632 link_info->keep_memory));
2633 if (internal_relocs == NULL)
2636 htab = elf_x86_64_hash_table (link_info);
2637 changed_contents = FALSE;
2638 changed_relocs = FALSE;
2639 local_got_refcounts = elf_local_got_refcounts (abfd);
2641 /* Get the section contents. */
2642 if (elf_section_data (sec)->this_hdr.contents != NULL)
2643 contents = elf_section_data (sec)->this_hdr.contents;
2646 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2650 irelend = internal_relocs + sec->reloc_count;
2651 for (irel = internal_relocs; irel < irelend; irel++)
2653 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2654 unsigned int r_symndx = htab->r_sym (irel->r_info);
2656 struct elf_link_hash_entry *h;
2658 if (r_type != R_X86_64_GOTPCREL)
2661 /* Get the symbol referred to by the reloc. */
2662 if (r_symndx < symtab_hdr->sh_info)
2664 Elf_Internal_Sym *isym;
2666 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2669 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2670 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2671 && bfd_get_8 (input_bfd,
2672 contents + irel->r_offset - 2) == 0x8b)
2674 bfd_put_8 (output_bfd, 0x8d,
2675 contents + irel->r_offset - 2);
2676 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2677 if (local_got_refcounts != NULL
2678 && local_got_refcounts[r_symndx] > 0)
2679 local_got_refcounts[r_symndx] -= 1;
2680 changed_contents = TRUE;
2681 changed_relocs = TRUE;
2686 indx = r_symndx - symtab_hdr->sh_info;
2687 h = elf_sym_hashes (abfd)[indx];
2688 BFD_ASSERT (h != NULL);
2690 while (h->root.type == bfd_link_hash_indirect
2691 || h->root.type == bfd_link_hash_warning)
2692 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2694 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2695 avoid optimizing _DYNAMIC since ld.so may use its link-time
2698 && h->type != STT_GNU_IFUNC
2699 && h != htab->elf.hdynamic
2700 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2701 && bfd_get_8 (input_bfd,
2702 contents + irel->r_offset - 2) == 0x8b)
2704 bfd_put_8 (output_bfd, 0x8d,
2705 contents + irel->r_offset - 2);
2706 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2707 if (h->got.refcount > 0)
2708 h->got.refcount -= 1;
2709 changed_contents = TRUE;
2710 changed_relocs = TRUE;
2714 if (contents != NULL
2715 && elf_section_data (sec)->this_hdr.contents != contents)
2717 if (!changed_contents && !link_info->keep_memory)
2721 /* Cache the section contents for elf_link_input_bfd. */
2722 elf_section_data (sec)->this_hdr.contents = contents;
2726 if (elf_section_data (sec)->relocs != internal_relocs)
2728 if (!changed_relocs)
2729 free (internal_relocs);
2731 elf_section_data (sec)->relocs = internal_relocs;
2737 if (contents != NULL
2738 && elf_section_data (sec)->this_hdr.contents != contents)
2740 if (internal_relocs != NULL
2741 && elf_section_data (sec)->relocs != internal_relocs)
2742 free (internal_relocs);
2746 /* Set the sizes of the dynamic sections. */
2749 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2750 struct bfd_link_info *info)
2752 struct elf_x86_64_link_hash_table *htab;
2757 const struct elf_backend_data *bed;
2759 htab = elf_x86_64_hash_table (info);
2762 bed = get_elf_backend_data (output_bfd);
2764 dynobj = htab->elf.dynobj;
2768 if (htab->elf.dynamic_sections_created)
2770 /* Set the contents of the .interp section to the interpreter. */
2771 if (info->executable)
2773 s = bfd_get_linker_section (dynobj, ".interp");
2776 s->size = htab->dynamic_interpreter_size;
2777 s->contents = (unsigned char *) htab->dynamic_interpreter;
2781 /* Set up .got offsets for local syms, and space for local dynamic
2783 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2785 bfd_signed_vma *local_got;
2786 bfd_signed_vma *end_local_got;
2787 char *local_tls_type;
2788 bfd_vma *local_tlsdesc_gotent;
2789 bfd_size_type locsymcount;
2790 Elf_Internal_Shdr *symtab_hdr;
2793 if (! is_x86_64_elf (ibfd))
2796 for (s = ibfd->sections; s != NULL; s = s->next)
2798 struct elf_dyn_relocs *p;
2800 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
2803 for (p = (struct elf_dyn_relocs *)
2804 (elf_section_data (s)->local_dynrel);
2808 if (!bfd_is_abs_section (p->sec)
2809 && bfd_is_abs_section (p->sec->output_section))
2811 /* Input section has been discarded, either because
2812 it is a copy of a linkonce section or due to
2813 linker script /DISCARD/, so we'll be discarding
2816 else if (p->count != 0)
2818 srel = elf_section_data (p->sec)->sreloc;
2819 srel->size += p->count * bed->s->sizeof_rela;
2820 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2821 && (info->flags & DF_TEXTREL) == 0)
2823 info->flags |= DF_TEXTREL;
2824 if (info->warn_shared_textrel && info->shared)
2825 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2826 p->sec->owner, p->sec);
2832 local_got = elf_local_got_refcounts (ibfd);
2836 symtab_hdr = &elf_symtab_hdr (ibfd);
2837 locsymcount = symtab_hdr->sh_info;
2838 end_local_got = local_got + locsymcount;
2839 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
2840 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
2842 srel = htab->elf.srelgot;
2843 for (; local_got < end_local_got;
2844 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2846 *local_tlsdesc_gotent = (bfd_vma) -1;
2849 if (GOT_TLS_GDESC_P (*local_tls_type))
2851 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2852 - elf_x86_64_compute_jump_table_size (htab);
2853 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2854 *local_got = (bfd_vma) -2;
2856 if (! GOT_TLS_GDESC_P (*local_tls_type)
2857 || GOT_TLS_GD_P (*local_tls_type))
2859 *local_got = s->size;
2860 s->size += GOT_ENTRY_SIZE;
2861 if (GOT_TLS_GD_P (*local_tls_type))
2862 s->size += GOT_ENTRY_SIZE;
2865 || GOT_TLS_GD_ANY_P (*local_tls_type)
2866 || *local_tls_type == GOT_TLS_IE)
2868 if (GOT_TLS_GDESC_P (*local_tls_type))
2870 htab->elf.srelplt->size
2871 += bed->s->sizeof_rela;
2872 htab->tlsdesc_plt = (bfd_vma) -1;
2874 if (! GOT_TLS_GDESC_P (*local_tls_type)
2875 || GOT_TLS_GD_P (*local_tls_type))
2876 srel->size += bed->s->sizeof_rela;
2880 *local_got = (bfd_vma) -1;
2884 if (htab->tls_ld_got.refcount > 0)
2886 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2888 htab->tls_ld_got.offset = htab->elf.sgot->size;
2889 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2890 htab->elf.srelgot->size += bed->s->sizeof_rela;
2893 htab->tls_ld_got.offset = -1;
2895 /* Allocate global sym .plt and .got entries, and space for global
2896 sym dynamic relocs. */
2897 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
2900 /* Allocate .plt and .got entries, and space for local symbols. */
2901 htab_traverse (htab->loc_hash_table,
2902 elf_x86_64_allocate_local_dynrelocs,
2905 /* For every jump slot reserved in the sgotplt, reloc_count is
2906 incremented. However, when we reserve space for TLS descriptors,
2907 it's not incremented, so in order to compute the space reserved
2908 for them, it suffices to multiply the reloc count by the jump
2911 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2912 so that R_X86_64_IRELATIVE entries come last. */
2913 if (htab->elf.srelplt)
2915 htab->sgotplt_jump_table_size
2916 = elf_x86_64_compute_jump_table_size (htab);
2917 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2919 else if (htab->elf.irelplt)
2920 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2922 if (htab->tlsdesc_plt)
2924 /* If we're not using lazy TLS relocations, don't generate the
2925 PLT and GOT entries they require. */
2926 if ((info->flags & DF_BIND_NOW))
2927 htab->tlsdesc_plt = 0;
2930 htab->tlsdesc_got = htab->elf.sgot->size;
2931 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2932 /* Reserve room for the initial entry.
2933 FIXME: we could probably do away with it in this case. */
2934 if (htab->elf.splt->size == 0)
2935 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2936 htab->tlsdesc_plt = htab->elf.splt->size;
2937 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2941 if (htab->elf.sgotplt)
2943 /* Don't allocate .got.plt section if there are no GOT nor PLT
2944 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2945 if ((htab->elf.hgot == NULL
2946 || !htab->elf.hgot->ref_regular_nonweak)
2947 && (htab->elf.sgotplt->size
2948 == get_elf_backend_data (output_bfd)->got_header_size)
2949 && (htab->elf.splt == NULL
2950 || htab->elf.splt->size == 0)
2951 && (htab->elf.sgot == NULL
2952 || htab->elf.sgot->size == 0)
2953 && (htab->elf.iplt == NULL
2954 || htab->elf.iplt->size == 0)
2955 && (htab->elf.igotplt == NULL
2956 || htab->elf.igotplt->size == 0))
2957 htab->elf.sgotplt->size = 0;
2960 if (htab->plt_eh_frame != NULL
2961 && htab->elf.splt != NULL
2962 && htab->elf.splt->size != 0
2963 && !bfd_is_abs_section (htab->elf.splt->output_section)
2964 && _bfd_elf_eh_frame_present (info))
2966 const struct elf_x86_64_backend_data *arch_data
2967 = get_elf_x86_64_arch_data (bed);
2968 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
2971 /* We now have determined the sizes of the various dynamic sections.
2972 Allocate memory for them. */
2974 for (s = dynobj->sections; s != NULL; s = s->next)
2976 if ((s->flags & SEC_LINKER_CREATED) == 0)
2979 if (s == htab->elf.splt
2980 || s == htab->elf.sgot
2981 || s == htab->elf.sgotplt
2982 || s == htab->elf.iplt
2983 || s == htab->elf.igotplt
2984 || s == htab->plt_eh_frame
2985 || s == htab->sdynbss)
2987 /* Strip this section if we don't need it; see the
2990 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2992 if (s->size != 0 && s != htab->elf.srelplt)
2995 /* We use the reloc_count field as a counter if we need
2996 to copy relocs into the output file. */
2997 if (s != htab->elf.srelplt)
3002 /* It's not one of our sections, so don't allocate space. */
3008 /* If we don't need this section, strip it from the
3009 output file. This is mostly to handle .rela.bss and
3010 .rela.plt. We must create both sections in
3011 create_dynamic_sections, because they must be created
3012 before the linker maps input sections to output
3013 sections. The linker does that before
3014 adjust_dynamic_symbol is called, and it is that
3015 function which decides whether anything needs to go
3016 into these sections. */
3018 s->flags |= SEC_EXCLUDE;
3022 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3025 /* Allocate memory for the section contents. We use bfd_zalloc
3026 here in case unused entries are not reclaimed before the
3027 section's contents are written out. This should not happen,
3028 but this way if it does, we get a R_X86_64_NONE reloc instead
3030 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3031 if (s->contents == NULL)
3035 if (htab->plt_eh_frame != NULL
3036 && htab->plt_eh_frame->contents != NULL)
3038 const struct elf_x86_64_backend_data *arch_data
3039 = get_elf_x86_64_arch_data (bed);
3041 memcpy (htab->plt_eh_frame->contents,
3042 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3043 bfd_put_32 (dynobj, htab->elf.splt->size,
3044 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3047 if (htab->elf.dynamic_sections_created)
3049 /* Add some entries to the .dynamic section. We fill in the
3050 values later, in elf_x86_64_finish_dynamic_sections, but we
3051 must add the entries now so that we get the correct size for
3052 the .dynamic section. The DT_DEBUG entry is filled in by the
3053 dynamic linker and used by the debugger. */
3054 #define add_dynamic_entry(TAG, VAL) \
3055 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3057 if (info->executable)
3059 if (!add_dynamic_entry (DT_DEBUG, 0))
3063 if (htab->elf.splt->size != 0)
3065 if (!add_dynamic_entry (DT_PLTGOT, 0)
3066 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3067 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3068 || !add_dynamic_entry (DT_JMPREL, 0))
3071 if (htab->tlsdesc_plt
3072 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3073 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3079 if (!add_dynamic_entry (DT_RELA, 0)
3080 || !add_dynamic_entry (DT_RELASZ, 0)
3081 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3084 /* If any dynamic relocs apply to a read-only section,
3085 then we need a DT_TEXTREL entry. */
3086 if ((info->flags & DF_TEXTREL) == 0)
3087 elf_link_hash_traverse (&htab->elf,
3088 elf_x86_64_readonly_dynrelocs,
3091 if ((info->flags & DF_TEXTREL) != 0)
3093 if (!add_dynamic_entry (DT_TEXTREL, 0))
3098 #undef add_dynamic_entry
3104 elf_x86_64_always_size_sections (bfd *output_bfd,
3105 struct bfd_link_info *info)
3107 asection *tls_sec = elf_hash_table (info)->tls_sec;
3111 struct elf_link_hash_entry *tlsbase;
3113 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3114 "_TLS_MODULE_BASE_",
3115 FALSE, FALSE, FALSE);
3117 if (tlsbase && tlsbase->type == STT_TLS)
3119 struct elf_x86_64_link_hash_table *htab;
3120 struct bfd_link_hash_entry *bh = NULL;
3121 const struct elf_backend_data *bed
3122 = get_elf_backend_data (output_bfd);
3124 htab = elf_x86_64_hash_table (info);
3128 if (!(_bfd_generic_link_add_one_symbol
3129 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3130 tls_sec, 0, NULL, FALSE,
3131 bed->collect, &bh)))
3134 htab->tls_module_base = bh;
3136 tlsbase = (struct elf_link_hash_entry *)bh;
3137 tlsbase->def_regular = 1;
3138 tlsbase->other = STV_HIDDEN;
3139 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3146 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3147 executables. Rather than setting it to the beginning of the TLS
3148 section, we have to set it to the end. This function may be called
3149 multiple times, it is idempotent. */
3152 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3154 struct elf_x86_64_link_hash_table *htab;
3155 struct bfd_link_hash_entry *base;
3157 if (!info->executable)
3160 htab = elf_x86_64_hash_table (info);
3164 base = htab->tls_module_base;
3168 base->u.def.value = htab->elf.tls_size;
3171 /* Return the base VMA address which should be subtracted from real addresses
3172 when resolving @dtpoff relocation.
3173 This is PT_TLS segment p_vaddr. */
3176 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3178 /* If tls_sec is NULL, we should have signalled an error already. */
3179 if (elf_hash_table (info)->tls_sec == NULL)
3181 return elf_hash_table (info)->tls_sec->vma;
3184 /* Return the relocation value for @tpoff relocation
3185 if STT_TLS virtual address is ADDRESS. */
3188 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3190 struct elf_link_hash_table *htab = elf_hash_table (info);
3191 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3192 bfd_vma static_tls_size;
3194 /* If tls_segment is NULL, we should have signalled an error already. */
3195 if (htab->tls_sec == NULL)
3198 /* Consider special static TLS alignment requirements. */
3199 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3200 return address - static_tls_size - htab->tls_sec->vma;
3203 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3207 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3209 /* Opcode Instruction
3212 0x0f 0x8x conditional jump */
3214 && (contents [offset - 1] == 0xe8
3215 || contents [offset - 1] == 0xe9))
3217 && contents [offset - 2] == 0x0f
3218 && (contents [offset - 1] & 0xf0) == 0x80));
3221 /* Relocate an x86_64 ELF section. */
3224 elf_x86_64_relocate_section (bfd *output_bfd,
3225 struct bfd_link_info *info,
3227 asection *input_section,
3229 Elf_Internal_Rela *relocs,
3230 Elf_Internal_Sym *local_syms,
3231 asection **local_sections)
3233 struct elf_x86_64_link_hash_table *htab;
3234 Elf_Internal_Shdr *symtab_hdr;
3235 struct elf_link_hash_entry **sym_hashes;
3236 bfd_vma *local_got_offsets;
3237 bfd_vma *local_tlsdesc_gotents;
3238 Elf_Internal_Rela *rel;
3239 Elf_Internal_Rela *relend;
3240 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3242 BFD_ASSERT (is_x86_64_elf (input_bfd));
3244 htab = elf_x86_64_hash_table (info);
3247 symtab_hdr = &elf_symtab_hdr (input_bfd);
3248 sym_hashes = elf_sym_hashes (input_bfd);
3249 local_got_offsets = elf_local_got_offsets (input_bfd);
3250 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3252 elf_x86_64_set_tls_module_base (info);
3255 relend = relocs + input_section->reloc_count;
3256 for (; rel < relend; rel++)
3258 unsigned int r_type;
3259 reloc_howto_type *howto;
3260 unsigned long r_symndx;
3261 struct elf_link_hash_entry *h;
3262 Elf_Internal_Sym *sym;
3264 bfd_vma off, offplt;
3266 bfd_boolean unresolved_reloc;
3267 bfd_reloc_status_type r;
3272 r_type = ELF32_R_TYPE (rel->r_info);
3273 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3274 || r_type == (int) R_X86_64_GNU_VTENTRY)
3277 if (r_type >= (int) R_X86_64_standard)
3279 (*_bfd_error_handler)
3280 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3281 input_bfd, input_section, r_type);
3282 bfd_set_error (bfd_error_bad_value);
3286 if (r_type != (int) R_X86_64_32
3287 || ABI_64_P (output_bfd))
3288 howto = x86_64_elf_howto_table + r_type;
3290 howto = (x86_64_elf_howto_table
3291 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3292 r_symndx = htab->r_sym (rel->r_info);
3296 unresolved_reloc = FALSE;
3297 if (r_symndx < symtab_hdr->sh_info)
3299 sym = local_syms + r_symndx;
3300 sec = local_sections[r_symndx];
3302 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3304 st_size = sym->st_size;
3306 /* Relocate against local STT_GNU_IFUNC symbol. */
3307 if (!info->relocatable
3308 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3310 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3315 /* Set STT_GNU_IFUNC symbol value. */
3316 h->root.u.def.value = sym->st_value;
3317 h->root.u.def.section = sec;
3322 bfd_boolean warned ATTRIBUTE_UNUSED;
3323 bfd_boolean ignored ATTRIBUTE_UNUSED;
3325 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3326 r_symndx, symtab_hdr, sym_hashes,
3328 unresolved_reloc, warned, ignored);
3332 if (sec != NULL && discarded_section (sec))
3333 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3334 rel, 1, relend, howto, 0, contents);
3336 if (info->relocatable)
3339 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3341 if (r_type == R_X86_64_64)
3343 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3344 zero-extend it to 64bit if addend is zero. */
3345 r_type = R_X86_64_32;
3346 memset (contents + rel->r_offset + 4, 0, 4);
3348 else if (r_type == R_X86_64_SIZE64)
3350 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3351 zero-extend it to 64bit if addend is zero. */
3352 r_type = R_X86_64_SIZE32;
3353 memset (contents + rel->r_offset + 4, 0, 4);
3357 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3358 it here if it is defined in a non-shared object. */
3360 && h->type == STT_GNU_IFUNC
3367 if ((input_section->flags & SEC_ALLOC) == 0
3368 || h->plt.offset == (bfd_vma) -1)
3371 /* STT_GNU_IFUNC symbol must go through PLT. */
3372 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3373 relocation = (plt->output_section->vma
3374 + plt->output_offset + h->plt.offset);
3379 if (h->root.root.string)
3380 name = h->root.root.string;
3382 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3384 (*_bfd_error_handler)
3385 (_("%B: relocation %s against STT_GNU_IFUNC "
3386 "symbol `%s' isn't handled by %s"), input_bfd,
3387 x86_64_elf_howto_table[r_type].name,
3388 name, __FUNCTION__);
3389 bfd_set_error (bfd_error_bad_value);
3398 if (ABI_64_P (output_bfd))
3402 if (rel->r_addend != 0)
3404 if (h->root.root.string)
3405 name = h->root.root.string;
3407 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3409 (*_bfd_error_handler)
3410 (_("%B: relocation %s against STT_GNU_IFUNC "
3411 "symbol `%s' has non-zero addend: %d"),
3412 input_bfd, x86_64_elf_howto_table[r_type].name,
3413 name, rel->r_addend);
3414 bfd_set_error (bfd_error_bad_value);
3418 /* Generate dynamic relcoation only when there is a
3419 non-GOT reference in a shared object. */
3420 if (info->shared && h->non_got_ref)
3422 Elf_Internal_Rela outrel;
3425 /* Need a dynamic relocation to get the real function
3427 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3431 if (outrel.r_offset == (bfd_vma) -1
3432 || outrel.r_offset == (bfd_vma) -2)
3435 outrel.r_offset += (input_section->output_section->vma
3436 + input_section->output_offset);
3438 if (h->dynindx == -1
3440 || info->executable)
3442 /* This symbol is resolved locally. */
3443 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3444 outrel.r_addend = (h->root.u.def.value
3445 + h->root.u.def.section->output_section->vma
3446 + h->root.u.def.section->output_offset);
3450 outrel.r_info = htab->r_info (h->dynindx, r_type);
3451 outrel.r_addend = 0;
3454 sreloc = htab->elf.irelifunc;
3455 elf_append_rela (output_bfd, sreloc, &outrel);
3457 /* If this reloc is against an external symbol, we
3458 do not want to fiddle with the addend. Otherwise,
3459 we need to include the symbol value so that it
3460 becomes an addend for the dynamic reloc. For an
3461 internal symbol, we have updated addend. */
3466 case R_X86_64_PC32_BND:
3468 case R_X86_64_PLT32:
3469 case R_X86_64_PLT32_BND:
3472 case R_X86_64_GOTPCREL:
3473 case R_X86_64_GOTPCREL64:
3474 base_got = htab->elf.sgot;
3475 off = h->got.offset;
3477 if (base_got == NULL)
3480 if (off == (bfd_vma) -1)
3482 /* We can't use h->got.offset here to save state, or
3483 even just remember the offset, as finish_dynamic_symbol
3484 would use that as offset into .got. */
3486 if (htab->elf.splt != NULL)
3488 plt_index = h->plt.offset / plt_entry_size - 1;
3489 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3490 base_got = htab->elf.sgotplt;
3494 plt_index = h->plt.offset / plt_entry_size;
3495 off = plt_index * GOT_ENTRY_SIZE;
3496 base_got = htab->elf.igotplt;
3499 if (h->dynindx == -1
3503 /* This references the local defitionion. We must
3504 initialize this entry in the global offset table.
3505 Since the offset must always be a multiple of 8,
3506 we use the least significant bit to record
3507 whether we have initialized it already.
3509 When doing a dynamic link, we create a .rela.got
3510 relocation entry to initialize the value. This
3511 is done in the finish_dynamic_symbol routine. */
3516 bfd_put_64 (output_bfd, relocation,
3517 base_got->contents + off);
3518 /* Note that this is harmless for the GOTPLT64
3519 case, as -1 | 1 still is -1. */
3525 relocation = (base_got->output_section->vma
3526 + base_got->output_offset + off);
3532 /* When generating a shared object, the relocations handled here are
3533 copied into the output file to be resolved at run time. */
3536 case R_X86_64_GOT32:
3537 case R_X86_64_GOT64:
3538 /* Relocation is to the entry for this symbol in the global
3540 case R_X86_64_GOTPCREL:
3541 case R_X86_64_GOTPCREL64:
3542 /* Use global offset table entry as symbol value. */
3543 case R_X86_64_GOTPLT64:
3544 /* This is the same as GOT64 for relocation purposes, but
3545 indicates the existence of a PLT entry. The difficulty is,
3546 that we must calculate the GOT slot offset from the PLT
3547 offset, if this symbol got a PLT entry (it was global).
3548 Additionally if it's computed from the PLT entry, then that
3549 GOT offset is relative to .got.plt, not to .got. */
3550 base_got = htab->elf.sgot;
3552 if (htab->elf.sgot == NULL)
3559 off = h->got.offset;
3561 && h->plt.offset != (bfd_vma)-1
3562 && off == (bfd_vma)-1)
3564 /* We can't use h->got.offset here to save
3565 state, or even just remember the offset, as
3566 finish_dynamic_symbol would use that as offset into
3568 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3569 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3570 base_got = htab->elf.sgotplt;
3573 dyn = htab->elf.dynamic_sections_created;
3575 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3577 && SYMBOL_REFERENCES_LOCAL (info, h))
3578 || (ELF_ST_VISIBILITY (h->other)
3579 && h->root.type == bfd_link_hash_undefweak))
3581 /* This is actually a static link, or it is a -Bsymbolic
3582 link and the symbol is defined locally, or the symbol
3583 was forced to be local because of a version file. We
3584 must initialize this entry in the global offset table.
3585 Since the offset must always be a multiple of 8, we
3586 use the least significant bit to record whether we
3587 have initialized it already.
3589 When doing a dynamic link, we create a .rela.got
3590 relocation entry to initialize the value. This is
3591 done in the finish_dynamic_symbol routine. */
3596 bfd_put_64 (output_bfd, relocation,
3597 base_got->contents + off);
3598 /* Note that this is harmless for the GOTPLT64 case,
3599 as -1 | 1 still is -1. */
3604 unresolved_reloc = FALSE;
3608 if (local_got_offsets == NULL)
3611 off = local_got_offsets[r_symndx];
3613 /* The offset must always be a multiple of 8. We use
3614 the least significant bit to record whether we have
3615 already generated the necessary reloc. */
3620 bfd_put_64 (output_bfd, relocation,
3621 base_got->contents + off);
3626 Elf_Internal_Rela outrel;
3628 /* We need to generate a R_X86_64_RELATIVE reloc
3629 for the dynamic linker. */
3630 s = htab->elf.srelgot;
3634 outrel.r_offset = (base_got->output_section->vma
3635 + base_got->output_offset
3637 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3638 outrel.r_addend = relocation;
3639 elf_append_rela (output_bfd, s, &outrel);
3642 local_got_offsets[r_symndx] |= 1;
3646 if (off >= (bfd_vma) -2)
3649 relocation = base_got->output_section->vma
3650 + base_got->output_offset + off;
3651 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3652 relocation -= htab->elf.sgotplt->output_section->vma
3653 - htab->elf.sgotplt->output_offset;
3657 case R_X86_64_GOTOFF64:
3658 /* Relocation is relative to the start of the global offset
3661 /* Check to make sure it isn't a protected function symbol
3662 for shared library since it may not be local when used
3663 as function address. */
3664 if (!info->executable
3666 && !SYMBOLIC_BIND (info, h)
3668 && h->type == STT_FUNC
3669 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3671 (*_bfd_error_handler)
3672 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3673 input_bfd, h->root.root.string);
3674 bfd_set_error (bfd_error_bad_value);
3678 /* Note that sgot is not involved in this
3679 calculation. We always want the start of .got.plt. If we
3680 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3681 permitted by the ABI, we might have to change this
3683 relocation -= htab->elf.sgotplt->output_section->vma
3684 + htab->elf.sgotplt->output_offset;
3687 case R_X86_64_GOTPC32:
3688 case R_X86_64_GOTPC64:
3689 /* Use global offset table as symbol value. */
3690 relocation = htab->elf.sgotplt->output_section->vma
3691 + htab->elf.sgotplt->output_offset;
3692 unresolved_reloc = FALSE;
3695 case R_X86_64_PLTOFF64:
3696 /* Relocation is PLT entry relative to GOT. For local
3697 symbols it's the symbol itself relative to GOT. */
3699 /* See PLT32 handling. */
3700 && h->plt.offset != (bfd_vma) -1
3701 && htab->elf.splt != NULL)
3703 relocation = (htab->elf.splt->output_section->vma
3704 + htab->elf.splt->output_offset
3706 unresolved_reloc = FALSE;
3709 relocation -= htab->elf.sgotplt->output_section->vma
3710 + htab->elf.sgotplt->output_offset;
3713 case R_X86_64_PLT32:
3714 case R_X86_64_PLT32_BND:
3715 /* Relocation is to the entry for this symbol in the
3716 procedure linkage table. */
3718 /* Resolve a PLT32 reloc against a local symbol directly,
3719 without using the procedure linkage table. */
3723 if (h->plt.offset == (bfd_vma) -1
3724 || htab->elf.splt == NULL)
3726 /* We didn't make a PLT entry for this symbol. This
3727 happens when statically linking PIC code, or when
3728 using -Bsymbolic. */
3732 relocation = (htab->elf.splt->output_section->vma
3733 + htab->elf.splt->output_offset
3735 unresolved_reloc = FALSE;
3738 case R_X86_64_SIZE32:
3739 case R_X86_64_SIZE64:
3740 /* Set to symbol size. */
3741 relocation = st_size;
3747 case R_X86_64_PC32_BND:
3749 && (input_section->flags & SEC_ALLOC) != 0
3750 && (input_section->flags & SEC_READONLY) != 0
3753 bfd_boolean fail = FALSE;
3755 = ((r_type == R_X86_64_PC32
3756 || r_type == R_X86_64_PC32_BND)
3757 && is_32bit_relative_branch (contents, rel->r_offset));
3759 if (SYMBOL_REFERENCES_LOCAL (info, h))
3761 /* Symbol is referenced locally. Make sure it is
3762 defined locally or for a branch. */
3763 fail = !h->def_regular && !branch;
3767 /* Symbol isn't referenced locally. We only allow
3768 branch to symbol with non-default visibility. */
3770 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3777 const char *pic = "";
3779 switch (ELF_ST_VISIBILITY (h->other))
3782 v = _("hidden symbol");
3785 v = _("internal symbol");
3788 v = _("protected symbol");
3792 pic = _("; recompile with -fPIC");
3797 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3799 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3801 (*_bfd_error_handler) (fmt, input_bfd,
3802 x86_64_elf_howto_table[r_type].name,
3803 v, h->root.root.string, pic);
3804 bfd_set_error (bfd_error_bad_value);
3815 /* FIXME: The ABI says the linker should make sure the value is
3816 the same when it's zeroextended to 64 bit. */
3819 if ((input_section->flags & SEC_ALLOC) == 0)
3824 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3825 || h->root.type != bfd_link_hash_undefweak)
3826 && ((! IS_X86_64_PCREL_TYPE (r_type)
3827 && r_type != R_X86_64_SIZE32
3828 && r_type != R_X86_64_SIZE64)
3829 || ! SYMBOL_CALLS_LOCAL (info, h)))
3830 || (ELIMINATE_COPY_RELOCS
3837 || h->root.type == bfd_link_hash_undefweak
3838 || h->root.type == bfd_link_hash_undefined)))
3840 Elf_Internal_Rela outrel;
3841 bfd_boolean skip, relocate;
3844 /* When generating a shared object, these relocations
3845 are copied into the output file to be resolved at run
3851 _bfd_elf_section_offset (output_bfd, info, input_section,
3853 if (outrel.r_offset == (bfd_vma) -1)
3855 else if (outrel.r_offset == (bfd_vma) -2)
3856 skip = TRUE, relocate = TRUE;
3858 outrel.r_offset += (input_section->output_section->vma
3859 + input_section->output_offset);
3862 memset (&outrel, 0, sizeof outrel);
3864 /* h->dynindx may be -1 if this symbol was marked to
3868 && (IS_X86_64_PCREL_TYPE (r_type)
3870 || ! SYMBOLIC_BIND (info, h)
3871 || ! h->def_regular))
3873 outrel.r_info = htab->r_info (h->dynindx, r_type);
3874 outrel.r_addend = rel->r_addend;
3878 /* This symbol is local, or marked to become local. */
3879 if (r_type == htab->pointer_r_type)
3882 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3883 outrel.r_addend = relocation + rel->r_addend;
3885 else if (r_type == R_X86_64_64
3886 && !ABI_64_P (output_bfd))
3889 outrel.r_info = htab->r_info (0,
3890 R_X86_64_RELATIVE64);
3891 outrel.r_addend = relocation + rel->r_addend;
3892 /* Check addend overflow. */
3893 if ((outrel.r_addend & 0x80000000)
3894 != (rel->r_addend & 0x80000000))
3897 int addend = rel->r_addend;
3898 if (h && h->root.root.string)
3899 name = h->root.root.string;
3901 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3904 (*_bfd_error_handler)
3905 (_("%B: addend -0x%x in relocation %s against "
3906 "symbol `%s' at 0x%lx in section `%A' is "
3908 input_bfd, input_section, addend,
3909 x86_64_elf_howto_table[r_type].name,
3910 name, (unsigned long) rel->r_offset);
3912 (*_bfd_error_handler)
3913 (_("%B: addend 0x%x in relocation %s against "
3914 "symbol `%s' at 0x%lx in section `%A' is "
3916 input_bfd, input_section, addend,
3917 x86_64_elf_howto_table[r_type].name,
3918 name, (unsigned long) rel->r_offset);
3919 bfd_set_error (bfd_error_bad_value);
3927 if (bfd_is_abs_section (sec))
3929 else if (sec == NULL || sec->owner == NULL)
3931 bfd_set_error (bfd_error_bad_value);
3938 /* We are turning this relocation into one
3939 against a section symbol. It would be
3940 proper to subtract the symbol's value,
3941 osec->vma, from the emitted reloc addend,
3942 but ld.so expects buggy relocs. */
3943 osec = sec->output_section;
3944 sindx = elf_section_data (osec)->dynindx;
3947 asection *oi = htab->elf.text_index_section;
3948 sindx = elf_section_data (oi)->dynindx;
3950 BFD_ASSERT (sindx != 0);
3953 outrel.r_info = htab->r_info (sindx, r_type);
3954 outrel.r_addend = relocation + rel->r_addend;
3958 sreloc = elf_section_data (input_section)->sreloc;
3960 if (sreloc == NULL || sreloc->contents == NULL)
3962 r = bfd_reloc_notsupported;
3963 goto check_relocation_error;
3966 elf_append_rela (output_bfd, sreloc, &outrel);
3968 /* If this reloc is against an external symbol, we do
3969 not want to fiddle with the addend. Otherwise, we
3970 need to include the symbol value so that it becomes
3971 an addend for the dynamic reloc. */
3978 case R_X86_64_TLSGD:
3979 case R_X86_64_GOTPC32_TLSDESC:
3980 case R_X86_64_TLSDESC_CALL:
3981 case R_X86_64_GOTTPOFF:
3982 tls_type = GOT_UNKNOWN;
3983 if (h == NULL && local_got_offsets)
3984 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3986 tls_type = elf_x86_64_hash_entry (h)->tls_type;
3988 if (! elf_x86_64_tls_transition (info, input_bfd,
3989 input_section, contents,
3990 symtab_hdr, sym_hashes,
3991 &r_type, tls_type, rel,
3992 relend, h, r_symndx))
3995 if (r_type == R_X86_64_TPOFF32)
3997 bfd_vma roff = rel->r_offset;
3999 BFD_ASSERT (! unresolved_reloc);
4001 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4003 /* GD->LE transition. For 64bit, change
4004 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4005 .word 0x6666; rex64; call __tls_get_addr
4008 leaq foo@tpoff(%rax), %rax
4010 leaq foo@tlsgd(%rip), %rdi
4011 .word 0x6666; rex64; call __tls_get_addr
4014 leaq foo@tpoff(%rax), %rax
4015 For largepic, change:
4016 leaq foo@tlsgd(%rip), %rdi
4017 movabsq $__tls_get_addr@pltoff, %rax
4022 leaq foo@tpoff(%rax), %rax
4023 nopw 0x0(%rax,%rax,1) */
4025 if (ABI_64_P (output_bfd)
4026 && contents[roff + 5] == (bfd_byte) '\xb8')
4028 memcpy (contents + roff - 3,
4029 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4030 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4033 else if (ABI_64_P (output_bfd))
4034 memcpy (contents + roff - 4,
4035 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4038 memcpy (contents + roff - 3,
4039 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4041 bfd_put_32 (output_bfd,
4042 elf_x86_64_tpoff (info, relocation),
4043 contents + roff + 8 + largepic);
4044 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4048 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4050 /* GDesc -> LE transition.
4051 It's originally something like:
4052 leaq x@tlsdesc(%rip), %rax
4055 movl $x@tpoff, %rax. */
4057 unsigned int val, type;
4059 type = bfd_get_8 (input_bfd, contents + roff - 3);
4060 val = bfd_get_8 (input_bfd, contents + roff - 1);
4061 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4062 contents + roff - 3);
4063 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4064 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4065 contents + roff - 1);
4066 bfd_put_32 (output_bfd,
4067 elf_x86_64_tpoff (info, relocation),
4071 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4073 /* GDesc -> LE transition.
4078 bfd_put_8 (output_bfd, 0x66, contents + roff);
4079 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4082 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4084 /* IE->LE transition:
4085 Originally it can be one of:
4086 movq foo@gottpoff(%rip), %reg
4087 addq foo@gottpoff(%rip), %reg
4090 leaq foo(%reg), %reg
4093 unsigned int val, type, reg;
4095 val = bfd_get_8 (input_bfd, contents + roff - 3);
4096 type = bfd_get_8 (input_bfd, contents + roff - 2);
4097 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4103 bfd_put_8 (output_bfd, 0x49,
4104 contents + roff - 3);
4105 else if (!ABI_64_P (output_bfd) && val == 0x44)
4106 bfd_put_8 (output_bfd, 0x41,
4107 contents + roff - 3);
4108 bfd_put_8 (output_bfd, 0xc7,
4109 contents + roff - 2);
4110 bfd_put_8 (output_bfd, 0xc0 | reg,
4111 contents + roff - 1);
4115 /* addq -> addq - addressing with %rsp/%r12 is
4118 bfd_put_8 (output_bfd, 0x49,
4119 contents + roff - 3);
4120 else if (!ABI_64_P (output_bfd) && val == 0x44)
4121 bfd_put_8 (output_bfd, 0x41,
4122 contents + roff - 3);
4123 bfd_put_8 (output_bfd, 0x81,
4124 contents + roff - 2);
4125 bfd_put_8 (output_bfd, 0xc0 | reg,
4126 contents + roff - 1);
4132 bfd_put_8 (output_bfd, 0x4d,
4133 contents + roff - 3);
4134 else if (!ABI_64_P (output_bfd) && val == 0x44)
4135 bfd_put_8 (output_bfd, 0x45,
4136 contents + roff - 3);
4137 bfd_put_8 (output_bfd, 0x8d,
4138 contents + roff - 2);
4139 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4140 contents + roff - 1);
4142 bfd_put_32 (output_bfd,
4143 elf_x86_64_tpoff (info, relocation),
4151 if (htab->elf.sgot == NULL)
4156 off = h->got.offset;
4157 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4161 if (local_got_offsets == NULL)
4164 off = local_got_offsets[r_symndx];
4165 offplt = local_tlsdesc_gotents[r_symndx];
4172 Elf_Internal_Rela outrel;
4176 if (htab->elf.srelgot == NULL)
4179 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4181 if (GOT_TLS_GDESC_P (tls_type))
4183 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4184 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4185 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4186 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4187 + htab->elf.sgotplt->output_offset
4189 + htab->sgotplt_jump_table_size);
4190 sreloc = htab->elf.srelplt;
4192 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4194 outrel.r_addend = 0;
4195 elf_append_rela (output_bfd, sreloc, &outrel);
4198 sreloc = htab->elf.srelgot;
4200 outrel.r_offset = (htab->elf.sgot->output_section->vma
4201 + htab->elf.sgot->output_offset + off);
4203 if (GOT_TLS_GD_P (tls_type))
4204 dr_type = R_X86_64_DTPMOD64;
4205 else if (GOT_TLS_GDESC_P (tls_type))
4208 dr_type = R_X86_64_TPOFF64;
4210 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4211 outrel.r_addend = 0;
4212 if ((dr_type == R_X86_64_TPOFF64
4213 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4214 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4215 outrel.r_info = htab->r_info (indx, dr_type);
4217 elf_append_rela (output_bfd, sreloc, &outrel);
4219 if (GOT_TLS_GD_P (tls_type))
4223 BFD_ASSERT (! unresolved_reloc);
4224 bfd_put_64 (output_bfd,
4225 relocation - elf_x86_64_dtpoff_base (info),
4226 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4230 bfd_put_64 (output_bfd, 0,
4231 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4232 outrel.r_info = htab->r_info (indx,
4234 outrel.r_offset += GOT_ENTRY_SIZE;
4235 elf_append_rela (output_bfd, sreloc,
4244 local_got_offsets[r_symndx] |= 1;
4247 if (off >= (bfd_vma) -2
4248 && ! GOT_TLS_GDESC_P (tls_type))
4250 if (r_type == ELF32_R_TYPE (rel->r_info))
4252 if (r_type == R_X86_64_GOTPC32_TLSDESC
4253 || r_type == R_X86_64_TLSDESC_CALL)
4254 relocation = htab->elf.sgotplt->output_section->vma
4255 + htab->elf.sgotplt->output_offset
4256 + offplt + htab->sgotplt_jump_table_size;
4258 relocation = htab->elf.sgot->output_section->vma
4259 + htab->elf.sgot->output_offset + off;
4260 unresolved_reloc = FALSE;
4264 bfd_vma roff = rel->r_offset;
4266 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4268 /* GD->IE transition. For 64bit, change
4269 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4270 .word 0x6666; rex64; call __tls_get_addr@plt
4273 addq foo@gottpoff(%rip), %rax
4275 leaq foo@tlsgd(%rip), %rdi
4276 .word 0x6666; rex64; call __tls_get_addr@plt
4279 addq foo@gottpoff(%rip), %rax
4280 For largepic, change:
4281 leaq foo@tlsgd(%rip), %rdi
4282 movabsq $__tls_get_addr@pltoff, %rax
4287 addq foo@gottpoff(%rax), %rax
4288 nopw 0x0(%rax,%rax,1) */
4290 if (ABI_64_P (output_bfd)
4291 && contents[roff + 5] == (bfd_byte) '\xb8')
4293 memcpy (contents + roff - 3,
4294 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4295 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4298 else if (ABI_64_P (output_bfd))
4299 memcpy (contents + roff - 4,
4300 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4303 memcpy (contents + roff - 3,
4304 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4307 relocation = (htab->elf.sgot->output_section->vma
4308 + htab->elf.sgot->output_offset + off
4311 - input_section->output_section->vma
4312 - input_section->output_offset
4314 bfd_put_32 (output_bfd, relocation,
4315 contents + roff + 8 + largepic);
4316 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4320 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4322 /* GDesc -> IE transition.
4323 It's originally something like:
4324 leaq x@tlsdesc(%rip), %rax
4327 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4329 /* Now modify the instruction as appropriate. To
4330 turn a leaq into a movq in the form we use it, it
4331 suffices to change the second byte from 0x8d to
4333 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4335 bfd_put_32 (output_bfd,
4336 htab->elf.sgot->output_section->vma
4337 + htab->elf.sgot->output_offset + off
4339 - input_section->output_section->vma
4340 - input_section->output_offset
4345 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4347 /* GDesc -> IE transition.
4354 bfd_put_8 (output_bfd, 0x66, contents + roff);
4355 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4363 case R_X86_64_TLSLD:
4364 if (! elf_x86_64_tls_transition (info, input_bfd,
4365 input_section, contents,
4366 symtab_hdr, sym_hashes,
4367 &r_type, GOT_UNKNOWN,
4368 rel, relend, h, r_symndx))
4371 if (r_type != R_X86_64_TLSLD)
4373 /* LD->LE transition:
4374 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4375 For 64bit, we change it into:
4376 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4377 For 32bit, we change it into:
4378 nopl 0x0(%rax); movl %fs:0, %eax.
4379 For largepic, change:
4380 leaq foo@tlsgd(%rip), %rdi
4381 movabsq $__tls_get_addr@pltoff, %rax
4385 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4388 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4389 if (ABI_64_P (output_bfd)
4390 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
4391 memcpy (contents + rel->r_offset - 3,
4392 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4393 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4394 else if (ABI_64_P (output_bfd))
4395 memcpy (contents + rel->r_offset - 3,
4396 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4398 memcpy (contents + rel->r_offset - 3,
4399 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4400 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4405 if (htab->elf.sgot == NULL)
4408 off = htab->tls_ld_got.offset;
4413 Elf_Internal_Rela outrel;
4415 if (htab->elf.srelgot == NULL)
4418 outrel.r_offset = (htab->elf.sgot->output_section->vma
4419 + htab->elf.sgot->output_offset + off);
4421 bfd_put_64 (output_bfd, 0,
4422 htab->elf.sgot->contents + off);
4423 bfd_put_64 (output_bfd, 0,
4424 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4425 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4426 outrel.r_addend = 0;
4427 elf_append_rela (output_bfd, htab->elf.srelgot,
4429 htab->tls_ld_got.offset |= 1;
4431 relocation = htab->elf.sgot->output_section->vma
4432 + htab->elf.sgot->output_offset + off;
4433 unresolved_reloc = FALSE;
4436 case R_X86_64_DTPOFF32:
4437 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4438 relocation -= elf_x86_64_dtpoff_base (info);
4440 relocation = elf_x86_64_tpoff (info, relocation);
4443 case R_X86_64_TPOFF32:
4444 case R_X86_64_TPOFF64:
4445 BFD_ASSERT (info->executable);
4446 relocation = elf_x86_64_tpoff (info, relocation);
4449 case R_X86_64_DTPOFF64:
4450 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4451 relocation -= elf_x86_64_dtpoff_base (info);
4458 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4459 because such sections are not SEC_ALLOC and thus ld.so will
4460 not process them. */
4461 if (unresolved_reloc
4462 && !((input_section->flags & SEC_DEBUGGING) != 0
4464 && _bfd_elf_section_offset (output_bfd, info, input_section,
4465 rel->r_offset) != (bfd_vma) -1)
4467 (*_bfd_error_handler)
4468 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4471 (long) rel->r_offset,
4473 h->root.root.string);
4478 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4479 contents, rel->r_offset,
4480 relocation, rel->r_addend);
4482 check_relocation_error:
4483 if (r != bfd_reloc_ok)
4488 name = h->root.root.string;
4491 name = bfd_elf_string_from_elf_section (input_bfd,
4492 symtab_hdr->sh_link,
4497 name = bfd_section_name (input_bfd, sec);
4500 if (r == bfd_reloc_overflow)
4502 if (! ((*info->callbacks->reloc_overflow)
4503 (info, (h ? &h->root : NULL), name, howto->name,
4504 (bfd_vma) 0, input_bfd, input_section,
4510 (*_bfd_error_handler)
4511 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4512 input_bfd, input_section,
4513 (long) rel->r_offset, name, (int) r);
4522 /* Finish up dynamic symbol handling. We set the contents of various
4523 dynamic sections here. */
4526 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4527 struct bfd_link_info *info,
4528 struct elf_link_hash_entry *h,
4529 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4531 struct elf_x86_64_link_hash_table *htab;
4532 const struct elf_x86_64_backend_data *const abed
4533 = get_elf_x86_64_backend_data (output_bfd);
4535 htab = elf_x86_64_hash_table (info);
4539 if (h->plt.offset != (bfd_vma) -1)
4543 Elf_Internal_Rela rela;
4545 asection *plt, *gotplt, *relplt;
4546 const struct elf_backend_data *bed;
4548 /* When building a static executable, use .iplt, .igot.plt and
4549 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4550 if (htab->elf.splt != NULL)
4552 plt = htab->elf.splt;
4553 gotplt = htab->elf.sgotplt;
4554 relplt = htab->elf.srelplt;
4558 plt = htab->elf.iplt;
4559 gotplt = htab->elf.igotplt;
4560 relplt = htab->elf.irelplt;
4563 /* This symbol has an entry in the procedure linkage table. Set
4565 if ((h->dynindx == -1
4566 && !((h->forced_local || info->executable)
4568 && h->type == STT_GNU_IFUNC))
4574 /* Get the index in the procedure linkage table which
4575 corresponds to this symbol. This is the index of this symbol
4576 in all the symbols for which we are making plt entries. The
4577 first entry in the procedure linkage table is reserved.
4579 Get the offset into the .got table of the entry that
4580 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4581 bytes. The first three are reserved for the dynamic linker.
4583 For static executables, we don't reserve anything. */
4585 if (plt == htab->elf.splt)
4587 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4588 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4592 got_offset = h->plt.offset / abed->plt_entry_size;
4593 got_offset = got_offset * GOT_ENTRY_SIZE;
4596 /* Fill in the entry in the procedure linkage table. */
4597 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4598 abed->plt_entry_size);
4600 /* Insert the relocation positions of the plt section. */
4602 /* Put offset the PC-relative instruction referring to the GOT entry,
4603 subtracting the size of that instruction. */
4604 bfd_put_32 (output_bfd,
4605 (gotplt->output_section->vma
4606 + gotplt->output_offset
4608 - plt->output_section->vma
4609 - plt->output_offset
4611 - abed->plt_got_insn_size),
4612 plt->contents + h->plt.offset + abed->plt_got_offset);
4614 /* Fill in the entry in the global offset table, initially this
4615 points to the second part of the PLT entry. */
4616 bfd_put_64 (output_bfd, (plt->output_section->vma
4617 + plt->output_offset
4618 + h->plt.offset + abed->plt_lazy_offset),
4619 gotplt->contents + got_offset);
4621 /* Fill in the entry in the .rela.plt section. */
4622 rela.r_offset = (gotplt->output_section->vma
4623 + gotplt->output_offset
4625 if (h->dynindx == -1
4626 || ((info->executable
4627 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4629 && h->type == STT_GNU_IFUNC))
4631 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4632 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4633 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4634 rela.r_addend = (h->root.u.def.value
4635 + h->root.u.def.section->output_section->vma
4636 + h->root.u.def.section->output_offset);
4637 /* R_X86_64_IRELATIVE comes last. */
4638 plt_index = htab->next_irelative_index--;
4642 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
4644 plt_index = htab->next_jump_slot_index++;
4647 /* Don't fill PLT entry for static executables. */
4648 if (plt == htab->elf.splt)
4650 /* Put relocation index. */
4651 bfd_put_32 (output_bfd, plt_index,
4652 plt->contents + h->plt.offset + abed->plt_reloc_offset);
4653 /* Put offset for jmp .PLT0. */
4654 bfd_put_32 (output_bfd, - (h->plt.offset + abed->plt_plt_insn_end),
4655 plt->contents + h->plt.offset + abed->plt_plt_offset);
4658 bed = get_elf_backend_data (output_bfd);
4659 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
4660 bed->s->swap_reloca_out (output_bfd, &rela, loc);
4662 if (!h->def_regular)
4664 /* Mark the symbol as undefined, rather than as defined in
4665 the .plt section. Leave the value if there were any
4666 relocations where pointer equality matters (this is a clue
4667 for the dynamic linker, to make function pointer
4668 comparisons work between an application and shared
4669 library), otherwise set it to zero. If a function is only
4670 called from a binary, there is no need to slow down
4671 shared libraries because of that. */
4672 sym->st_shndx = SHN_UNDEF;
4673 if (!h->pointer_equality_needed)
4678 if (h->got.offset != (bfd_vma) -1
4679 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
4680 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
4682 Elf_Internal_Rela rela;
4684 /* This symbol has an entry in the global offset table. Set it
4686 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4689 rela.r_offset = (htab->elf.sgot->output_section->vma
4690 + htab->elf.sgot->output_offset
4691 + (h->got.offset &~ (bfd_vma) 1));
4693 /* If this is a static link, or it is a -Bsymbolic link and the
4694 symbol is defined locally or was forced to be local because
4695 of a version file, we just want to emit a RELATIVE reloc.
4696 The entry in the global offset table will already have been
4697 initialized in the relocate_section function. */
4699 && h->type == STT_GNU_IFUNC)
4703 /* Generate R_X86_64_GLOB_DAT. */
4710 if (!h->pointer_equality_needed)
4713 /* For non-shared object, we can't use .got.plt, which
4714 contains the real function addres if we need pointer
4715 equality. We load the GOT entry with the PLT entry. */
4716 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4717 bfd_put_64 (output_bfd, (plt->output_section->vma
4718 + plt->output_offset
4720 htab->elf.sgot->contents + h->got.offset);
4724 else if (info->shared
4725 && SYMBOL_REFERENCES_LOCAL (info, h))
4727 if (!h->def_regular)
4729 BFD_ASSERT((h->got.offset & 1) != 0);
4730 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4731 rela.r_addend = (h->root.u.def.value
4732 + h->root.u.def.section->output_section->vma
4733 + h->root.u.def.section->output_offset);
4737 BFD_ASSERT((h->got.offset & 1) == 0);
4739 bfd_put_64 (output_bfd, (bfd_vma) 0,
4740 htab->elf.sgot->contents + h->got.offset);
4741 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4745 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
4750 Elf_Internal_Rela rela;
4752 /* This symbol needs a copy reloc. Set it up. */
4754 if (h->dynindx == -1
4755 || (h->root.type != bfd_link_hash_defined
4756 && h->root.type != bfd_link_hash_defweak)
4757 || htab->srelbss == NULL)
4760 rela.r_offset = (h->root.u.def.value
4761 + h->root.u.def.section->output_section->vma
4762 + h->root.u.def.section->output_offset);
4763 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4765 elf_append_rela (output_bfd, htab->srelbss, &rela);
4771 /* Finish up local dynamic symbol handling. We set the contents of
4772 various dynamic sections here. */
4775 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4777 struct elf_link_hash_entry *h
4778 = (struct elf_link_hash_entry *) *slot;
4779 struct bfd_link_info *info
4780 = (struct bfd_link_info *) inf;
4782 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4786 /* Used to decide how to sort relocs in an optimal manner for the
4787 dynamic linker, before writing them out. */
4789 static enum elf_reloc_type_class
4790 elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4791 const asection *rel_sec ATTRIBUTE_UNUSED,
4792 const Elf_Internal_Rela *rela)
4794 switch ((int) ELF32_R_TYPE (rela->r_info))
4796 case R_X86_64_RELATIVE:
4797 case R_X86_64_RELATIVE64:
4798 return reloc_class_relative;
4799 case R_X86_64_JUMP_SLOT:
4800 return reloc_class_plt;
4802 return reloc_class_copy;
4804 return reloc_class_normal;
4808 /* Finish up the dynamic sections. */
4811 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4812 struct bfd_link_info *info)
4814 struct elf_x86_64_link_hash_table *htab;
4817 const struct elf_x86_64_backend_data *const abed
4818 = get_elf_x86_64_backend_data (output_bfd);
4820 htab = elf_x86_64_hash_table (info);
4824 dynobj = htab->elf.dynobj;
4825 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4827 if (htab->elf.dynamic_sections_created)
4829 bfd_byte *dyncon, *dynconend;
4830 const struct elf_backend_data *bed;
4831 bfd_size_type sizeof_dyn;
4833 if (sdyn == NULL || htab->elf.sgot == NULL)
4836 bed = get_elf_backend_data (dynobj);
4837 sizeof_dyn = bed->s->sizeof_dyn;
4838 dyncon = sdyn->contents;
4839 dynconend = sdyn->contents + sdyn->size;
4840 for (; dyncon < dynconend; dyncon += sizeof_dyn)
4842 Elf_Internal_Dyn dyn;
4845 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
4853 s = htab->elf.sgotplt;
4854 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4858 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4862 s = htab->elf.srelplt->output_section;
4863 dyn.d_un.d_val = s->size;
4867 /* The procedure linkage table relocs (DT_JMPREL) should
4868 not be included in the overall relocs (DT_RELA).
4869 Therefore, we override the DT_RELASZ entry here to
4870 make it not include the JMPREL relocs. Since the
4871 linker script arranges for .rela.plt to follow all
4872 other relocation sections, we don't have to worry
4873 about changing the DT_RELA entry. */
4874 if (htab->elf.srelplt != NULL)
4876 s = htab->elf.srelplt->output_section;
4877 dyn.d_un.d_val -= s->size;
4881 case DT_TLSDESC_PLT:
4883 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4884 + htab->tlsdesc_plt;
4887 case DT_TLSDESC_GOT:
4889 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4890 + htab->tlsdesc_got;
4894 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
4897 /* Fill in the special first entry in the procedure linkage table. */
4898 if (htab->elf.splt && htab->elf.splt->size > 0)
4900 /* Fill in the first entry in the procedure linkage table. */
4901 memcpy (htab->elf.splt->contents,
4902 abed->plt0_entry, abed->plt_entry_size);
4903 /* Add offset for pushq GOT+8(%rip), since the instruction
4904 uses 6 bytes subtract this value. */
4905 bfd_put_32 (output_bfd,
4906 (htab->elf.sgotplt->output_section->vma
4907 + htab->elf.sgotplt->output_offset
4909 - htab->elf.splt->output_section->vma
4910 - htab->elf.splt->output_offset
4912 htab->elf.splt->contents + abed->plt0_got1_offset);
4913 /* Add offset for the PC-relative instruction accessing GOT+16,
4914 subtracting the offset to the end of that instruction. */
4915 bfd_put_32 (output_bfd,
4916 (htab->elf.sgotplt->output_section->vma
4917 + htab->elf.sgotplt->output_offset
4919 - htab->elf.splt->output_section->vma
4920 - htab->elf.splt->output_offset
4921 - abed->plt0_got2_insn_end),
4922 htab->elf.splt->contents + abed->plt0_got2_offset);
4924 elf_section_data (htab->elf.splt->output_section)
4925 ->this_hdr.sh_entsize = abed->plt_entry_size;
4927 if (htab->tlsdesc_plt)
4929 bfd_put_64 (output_bfd, (bfd_vma) 0,
4930 htab->elf.sgot->contents + htab->tlsdesc_got);
4932 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4933 abed->plt0_entry, abed->plt_entry_size);
4935 /* Add offset for pushq GOT+8(%rip), since the
4936 instruction uses 6 bytes subtract this value. */
4937 bfd_put_32 (output_bfd,
4938 (htab->elf.sgotplt->output_section->vma
4939 + htab->elf.sgotplt->output_offset
4941 - htab->elf.splt->output_section->vma
4942 - htab->elf.splt->output_offset
4945 htab->elf.splt->contents
4946 + htab->tlsdesc_plt + abed->plt0_got1_offset);
4947 /* Add offset for the PC-relative instruction accessing GOT+TDG,
4948 where TGD stands for htab->tlsdesc_got, subtracting the offset
4949 to the end of that instruction. */
4950 bfd_put_32 (output_bfd,
4951 (htab->elf.sgot->output_section->vma
4952 + htab->elf.sgot->output_offset
4954 - htab->elf.splt->output_section->vma
4955 - htab->elf.splt->output_offset
4957 - abed->plt0_got2_insn_end),
4958 htab->elf.splt->contents
4959 + htab->tlsdesc_plt + abed->plt0_got2_offset);
4964 if (htab->elf.sgotplt)
4966 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4968 (*_bfd_error_handler)
4969 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4973 /* Fill in the first three entries in the global offset table. */
4974 if (htab->elf.sgotplt->size > 0)
4976 /* Set the first entry in the global offset table to the address of
4977 the dynamic section. */
4979 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4981 bfd_put_64 (output_bfd,
4982 sdyn->output_section->vma + sdyn->output_offset,
4983 htab->elf.sgotplt->contents);
4984 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4985 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4986 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4989 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4993 /* Adjust .eh_frame for .plt section. */
4994 if (htab->plt_eh_frame != NULL
4995 && htab->plt_eh_frame->contents != NULL)
4997 if (htab->elf.splt != NULL
4998 && htab->elf.splt->size != 0
4999 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5000 && htab->elf.splt->output_section != NULL
5001 && htab->plt_eh_frame->output_section != NULL)
5003 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5004 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5005 + htab->plt_eh_frame->output_offset
5006 + PLT_FDE_START_OFFSET;
5007 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5008 htab->plt_eh_frame->contents
5009 + PLT_FDE_START_OFFSET);
5011 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5013 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5015 htab->plt_eh_frame->contents))
5020 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5021 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5024 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5025 htab_traverse (htab->loc_hash_table,
5026 elf_x86_64_finish_local_dynamic_symbol,
5032 /* Return address for Ith PLT stub in section PLT, for relocation REL
5033 or (bfd_vma) -1 if it should not be included. */
5036 elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
5037 const arelent *rel ATTRIBUTE_UNUSED)
5039 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
5042 /* Handle an x86-64 specific section when reading an object file. This
5043 is called when elfcode.h finds a section with an unknown type. */
5046 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5047 const char *name, int shindex)
5049 if (hdr->sh_type != SHT_X86_64_UNWIND)
5052 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5058 /* Hook called by the linker routine which adds symbols from an object
5059 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5063 elf_x86_64_add_symbol_hook (bfd *abfd,
5064 struct bfd_link_info *info,
5065 Elf_Internal_Sym *sym,
5066 const char **namep ATTRIBUTE_UNUSED,
5067 flagword *flagsp ATTRIBUTE_UNUSED,
5073 switch (sym->st_shndx)
5075 case SHN_X86_64_LCOMMON:
5076 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
5079 lcomm = bfd_make_section_with_flags (abfd,
5083 | SEC_LINKER_CREATED));
5086 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
5089 *valp = sym->st_size;
5093 if ((abfd->flags & DYNAMIC) == 0
5094 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5095 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5096 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5102 /* Given a BFD section, try to locate the corresponding ELF section
5106 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
5107 asection *sec, int *index_return)
5109 if (sec == &_bfd_elf_large_com_section)
5111 *index_return = SHN_X86_64_LCOMMON;
5117 /* Process a symbol. */
5120 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5123 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5125 switch (elfsym->internal_elf_sym.st_shndx)
5127 case SHN_X86_64_LCOMMON:
5128 asym->section = &_bfd_elf_large_com_section;
5129 asym->value = elfsym->internal_elf_sym.st_size;
5130 /* Common symbol doesn't set BSF_GLOBAL. */
5131 asym->flags &= ~BSF_GLOBAL;
5137 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5139 return (sym->st_shndx == SHN_COMMON
5140 || sym->st_shndx == SHN_X86_64_LCOMMON);
5144 elf_x86_64_common_section_index (asection *sec)
5146 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5149 return SHN_X86_64_LCOMMON;
5153 elf_x86_64_common_section (asection *sec)
5155 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5156 return bfd_com_section_ptr;
5158 return &_bfd_elf_large_com_section;
5162 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
5163 const Elf_Internal_Sym *sym,
5168 const asection *oldsec)
5170 /* A normal common symbol and a large common symbol result in a
5171 normal common symbol. We turn the large common symbol into a
5174 && h->root.type == bfd_link_hash_common
5176 && bfd_is_com_section (*psec)
5179 if (sym->st_shndx == SHN_COMMON
5180 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
5182 h->root.u.c.p->section
5183 = bfd_make_section_old_way (oldbfd, "COMMON");
5184 h->root.u.c.p->section->flags = SEC_ALLOC;
5186 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5187 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
5188 *psec = bfd_com_section_ptr;
5195 elf_x86_64_additional_program_headers (bfd *abfd,
5196 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5201 /* Check to see if we need a large readonly segment. */
5202 s = bfd_get_section_by_name (abfd, ".lrodata");
5203 if (s && (s->flags & SEC_LOAD))
5206 /* Check to see if we need a large data segment. Since .lbss sections
5207 is placed right after the .bss section, there should be no need for
5208 a large data segment just because of .lbss. */
5209 s = bfd_get_section_by_name (abfd, ".ldata");
5210 if (s && (s->flags & SEC_LOAD))
5216 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5219 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5221 if (h->plt.offset != (bfd_vma) -1
5223 && !h->pointer_equality_needed)
5226 return _bfd_elf_hash_symbol (h);
5229 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5232 elf_x86_64_relocs_compatible (const bfd_target *input,
5233 const bfd_target *output)
5235 return ((xvec_get_elf_backend_data (input)->s->elfclass
5236 == xvec_get_elf_backend_data (output)->s->elfclass)
5237 && _bfd_elf_relocs_compatible (input, output));
5240 static const struct bfd_elf_special_section
5241 elf_x86_64_special_sections[]=
5243 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5244 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5245 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5246 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5247 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5248 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5249 { NULL, 0, 0, 0, 0 }
5252 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
5253 #define TARGET_LITTLE_NAME "elf64-x86-64"
5254 #define ELF_ARCH bfd_arch_i386
5255 #define ELF_TARGET_ID X86_64_ELF_DATA
5256 #define ELF_MACHINE_CODE EM_X86_64
5257 #define ELF_MAXPAGESIZE 0x200000
5258 #define ELF_MINPAGESIZE 0x1000
5259 #define ELF_COMMONPAGESIZE 0x1000
5261 #define elf_backend_can_gc_sections 1
5262 #define elf_backend_can_refcount 1
5263 #define elf_backend_want_got_plt 1
5264 #define elf_backend_plt_readonly 1
5265 #define elf_backend_want_plt_sym 0
5266 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5267 #define elf_backend_rela_normal 1
5268 #define elf_backend_plt_alignment 4
5270 #define elf_info_to_howto elf_x86_64_info_to_howto
5272 #define bfd_elf64_bfd_link_hash_table_create \
5273 elf_x86_64_link_hash_table_create
5274 #define bfd_elf64_bfd_link_hash_table_free \
5275 elf_x86_64_link_hash_table_free
5276 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5277 #define bfd_elf64_bfd_reloc_name_lookup \
5278 elf_x86_64_reloc_name_lookup
5280 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5281 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5282 #define elf_backend_check_relocs elf_x86_64_check_relocs
5283 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5284 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5285 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5286 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5287 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5288 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5289 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5290 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5292 #define elf_backend_write_core_note elf_x86_64_write_core_note
5294 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5295 #define elf_backend_relocate_section elf_x86_64_relocate_section
5296 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5297 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5298 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5299 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5300 #define elf_backend_object_p elf64_x86_64_elf_object_p
5301 #define bfd_elf64_mkobject elf_x86_64_mkobject
5303 #define elf_backend_section_from_shdr \
5304 elf_x86_64_section_from_shdr
5306 #define elf_backend_section_from_bfd_section \
5307 elf_x86_64_elf_section_from_bfd_section
5308 #define elf_backend_add_symbol_hook \
5309 elf_x86_64_add_symbol_hook
5310 #define elf_backend_symbol_processing \
5311 elf_x86_64_symbol_processing
5312 #define elf_backend_common_section_index \
5313 elf_x86_64_common_section_index
5314 #define elf_backend_common_section \
5315 elf_x86_64_common_section
5316 #define elf_backend_common_definition \
5317 elf_x86_64_common_definition
5318 #define elf_backend_merge_symbol \
5319 elf_x86_64_merge_symbol
5320 #define elf_backend_special_sections \
5321 elf_x86_64_special_sections
5322 #define elf_backend_additional_program_headers \
5323 elf_x86_64_additional_program_headers
5324 #define elf_backend_hash_symbol \
5325 elf_x86_64_hash_symbol
5327 #include "elf64-target.h"
5329 /* FreeBSD support. */
5331 #undef TARGET_LITTLE_SYM
5332 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
5333 #undef TARGET_LITTLE_NAME
5334 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5337 #define ELF_OSABI ELFOSABI_FREEBSD
5340 #define elf64_bed elf64_x86_64_fbsd_bed
5342 #include "elf64-target.h"
5344 /* Solaris 2 support. */
5346 #undef TARGET_LITTLE_SYM
5347 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
5348 #undef TARGET_LITTLE_NAME
5349 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5351 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5352 objects won't be recognized. */
5356 #define elf64_bed elf64_x86_64_sol2_bed
5358 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5360 #undef elf_backend_static_tls_alignment
5361 #define elf_backend_static_tls_alignment 16
5363 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5365 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5367 #undef elf_backend_want_plt_sym
5368 #define elf_backend_want_plt_sym 1
5370 #include "elf64-target.h"
5372 /* Native Client support. */
5375 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
5377 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
5378 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
5382 #undef TARGET_LITTLE_SYM
5383 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec
5384 #undef TARGET_LITTLE_NAME
5385 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5387 #define elf64_bed elf64_x86_64_nacl_bed
5389 #undef ELF_MAXPAGESIZE
5390 #undef ELF_MINPAGESIZE
5391 #undef ELF_COMMONPAGESIZE
5392 #define ELF_MAXPAGESIZE 0x10000
5393 #define ELF_MINPAGESIZE 0x10000
5394 #define ELF_COMMONPAGESIZE 0x10000
5396 /* Restore defaults. */
5398 #undef elf_backend_static_tls_alignment
5399 #undef elf_backend_want_plt_sym
5400 #define elf_backend_want_plt_sym 0
5402 /* NaCl uses substantially different PLT entries for the same effects. */
5404 #undef elf_backend_plt_alignment
5405 #define elf_backend_plt_alignment 5
5406 #define NACL_PLT_ENTRY_SIZE 64
5407 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5409 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5411 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5412 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5413 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5414 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5415 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5417 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5418 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
5420 /* 32 bytes of nop to pad out to the standard size. */
5421 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5422 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5423 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5424 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5425 0x66, /* excess data32 prefix */
5429 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5431 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5432 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5433 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5434 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5436 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5437 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5438 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5440 /* Lazy GOT entries point here (32-byte aligned). */
5441 0x68, /* pushq immediate */
5442 0, 0, 0, 0, /* replaced with index into relocation table. */
5443 0xe9, /* jmp relative */
5444 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5446 /* 22 bytes of nop to pad out to the standard size. */
5447 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5448 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5449 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5452 /* .eh_frame covering the .plt section. */
5454 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
5456 #if (PLT_CIE_LENGTH != 20 \
5457 || PLT_FDE_LENGTH != 36 \
5458 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5459 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5460 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5462 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5463 0, 0, 0, 0, /* CIE ID */
5464 1, /* CIE version */
5465 'z', 'R', 0, /* Augmentation string */
5466 1, /* Code alignment factor */
5467 0x78, /* Data alignment factor */
5468 16, /* Return address column */
5469 1, /* Augmentation size */
5470 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5471 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5472 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5473 DW_CFA_nop, DW_CFA_nop,
5475 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5476 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
5477 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5478 0, 0, 0, 0, /* .plt size goes here */
5479 0, /* Augmentation size */
5480 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
5481 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5482 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
5483 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5484 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5485 13, /* Block length */
5486 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
5487 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
5488 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5489 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
5490 DW_CFA_nop, DW_CFA_nop
5493 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
5495 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
5496 elf_x86_64_nacl_plt_entry, /* plt_entry */
5497 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5498 2, /* plt0_got1_offset */
5499 9, /* plt0_got2_offset */
5500 13, /* plt0_got2_insn_end */
5501 3, /* plt_got_offset */
5502 33, /* plt_reloc_offset */
5503 38, /* plt_plt_offset */
5504 7, /* plt_got_insn_size */
5505 42, /* plt_plt_insn_end */
5506 32, /* plt_lazy_offset */
5507 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
5508 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
5511 #undef elf_backend_arch_data
5512 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5514 #undef elf_backend_object_p
5515 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
5516 #undef elf_backend_modify_segment_map
5517 #define elf_backend_modify_segment_map nacl_modify_segment_map
5518 #undef elf_backend_modify_program_headers
5519 #define elf_backend_modify_program_headers nacl_modify_program_headers
5520 #undef elf_backend_final_write_processing
5521 #define elf_backend_final_write_processing nacl_final_write_processing
5523 #include "elf64-target.h"
5525 /* Native Client x32 support. */
5528 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
5530 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
5531 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
5535 #undef TARGET_LITTLE_SYM
5536 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec
5537 #undef TARGET_LITTLE_NAME
5538 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5540 #define elf32_bed elf32_x86_64_nacl_bed
5542 #define bfd_elf32_bfd_link_hash_table_create \
5543 elf_x86_64_link_hash_table_create
5544 #define bfd_elf32_bfd_link_hash_table_free \
5545 elf_x86_64_link_hash_table_free
5546 #define bfd_elf32_bfd_reloc_type_lookup \
5547 elf_x86_64_reloc_type_lookup
5548 #define bfd_elf32_bfd_reloc_name_lookup \
5549 elf_x86_64_reloc_name_lookup
5550 #define bfd_elf32_mkobject \
5553 #undef elf_backend_object_p
5554 #define elf_backend_object_p \
5555 elf32_x86_64_nacl_elf_object_p
5557 #undef elf_backend_bfd_from_remote_memory
5558 #define elf_backend_bfd_from_remote_memory \
5559 _bfd_elf32_bfd_from_remote_memory
5561 #undef elf_backend_size_info
5562 #define elf_backend_size_info \
5563 _bfd_elf32_size_info
5565 #include "elf32-target.h"
5567 /* Restore defaults. */
5568 #undef elf_backend_object_p
5569 #define elf_backend_object_p elf64_x86_64_elf_object_p
5570 #undef elf_backend_bfd_from_remote_memory
5571 #undef elf_backend_size_info
5572 #undef elf_backend_modify_segment_map
5573 #undef elf_backend_modify_program_headers
5574 #undef elf_backend_final_write_processing
5576 /* Intel L1OM support. */
5579 elf64_l1om_elf_object_p (bfd *abfd)
5581 /* Set the right machine number for an L1OM elf64 file. */
5582 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
5586 #undef TARGET_LITTLE_SYM
5587 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
5588 #undef TARGET_LITTLE_NAME
5589 #define TARGET_LITTLE_NAME "elf64-l1om"
5591 #define ELF_ARCH bfd_arch_l1om
5593 #undef ELF_MACHINE_CODE
5594 #define ELF_MACHINE_CODE EM_L1OM
5599 #define elf64_bed elf64_l1om_bed
5601 #undef elf_backend_object_p
5602 #define elf_backend_object_p elf64_l1om_elf_object_p
5604 /* Restore defaults. */
5605 #undef ELF_MAXPAGESIZE
5606 #undef ELF_MINPAGESIZE
5607 #undef ELF_COMMONPAGESIZE
5608 #define ELF_MAXPAGESIZE 0x200000
5609 #define ELF_MINPAGESIZE 0x1000
5610 #define ELF_COMMONPAGESIZE 0x1000
5611 #undef elf_backend_plt_alignment
5612 #define elf_backend_plt_alignment 4
5613 #undef elf_backend_arch_data
5614 #define elf_backend_arch_data &elf_x86_64_arch_bed
5616 #include "elf64-target.h"
5618 /* FreeBSD L1OM support. */
5620 #undef TARGET_LITTLE_SYM
5621 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
5622 #undef TARGET_LITTLE_NAME
5623 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5626 #define ELF_OSABI ELFOSABI_FREEBSD
5629 #define elf64_bed elf64_l1om_fbsd_bed
5631 #include "elf64-target.h"
5633 /* Intel K1OM support. */
5636 elf64_k1om_elf_object_p (bfd *abfd)
5638 /* Set the right machine number for an K1OM elf64 file. */
5639 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
5643 #undef TARGET_LITTLE_SYM
5644 #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec
5645 #undef TARGET_LITTLE_NAME
5646 #define TARGET_LITTLE_NAME "elf64-k1om"
5648 #define ELF_ARCH bfd_arch_k1om
5650 #undef ELF_MACHINE_CODE
5651 #define ELF_MACHINE_CODE EM_K1OM
5656 #define elf64_bed elf64_k1om_bed
5658 #undef elf_backend_object_p
5659 #define elf_backend_object_p elf64_k1om_elf_object_p
5661 #undef elf_backend_static_tls_alignment
5663 #undef elf_backend_want_plt_sym
5664 #define elf_backend_want_plt_sym 0
5666 #include "elf64-target.h"
5668 /* FreeBSD K1OM support. */
5670 #undef TARGET_LITTLE_SYM
5671 #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec
5672 #undef TARGET_LITTLE_NAME
5673 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5676 #define ELF_OSABI ELFOSABI_FREEBSD
5679 #define elf64_bed elf64_k1om_fbsd_bed
5681 #include "elf64-target.h"
5683 /* 32bit x86-64 support. */
5685 #undef TARGET_LITTLE_SYM
5686 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
5687 #undef TARGET_LITTLE_NAME
5688 #define TARGET_LITTLE_NAME "elf32-x86-64"
5692 #define ELF_ARCH bfd_arch_i386
5694 #undef ELF_MACHINE_CODE
5695 #define ELF_MACHINE_CODE EM_X86_64
5699 #undef elf_backend_object_p
5700 #define elf_backend_object_p \
5701 elf32_x86_64_elf_object_p
5703 #undef elf_backend_bfd_from_remote_memory
5704 #define elf_backend_bfd_from_remote_memory \
5705 _bfd_elf32_bfd_from_remote_memory
5707 #undef elf_backend_size_info
5708 #define elf_backend_size_info \
5709 _bfd_elf32_size_info
5711 #include "elf32-target.h"