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,
176 /* We have a gap in the reloc numbers here.
177 R_X86_64_standard counts the number up to this point, and
178 R_X86_64_vt_offset is the value to subtract from a reloc type of
179 R_X86_64_GNU_VT* to form an index into this table. */
180 #define R_X86_64_standard (R_X86_64_RELATIVE64 + 1)
181 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
183 /* GNU extension to record C++ vtable hierarchy. */
184 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
185 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
187 /* GNU extension to record C++ vtable member usage. */
188 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
189 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
192 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
193 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
194 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
198 #define IS_X86_64_PCREL_TYPE(TYPE) \
199 ( ((TYPE) == R_X86_64_PC8) \
200 || ((TYPE) == R_X86_64_PC16) \
201 || ((TYPE) == R_X86_64_PC32) \
202 || ((TYPE) == R_X86_64_PC64))
204 /* Map BFD relocs to the x86_64 elf relocs. */
207 bfd_reloc_code_real_type bfd_reloc_val;
208 unsigned char elf_reloc_val;
211 static const struct elf_reloc_map x86_64_reloc_map[] =
213 { BFD_RELOC_NONE, R_X86_64_NONE, },
214 { BFD_RELOC_64, R_X86_64_64, },
215 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
216 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
217 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
218 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
219 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
220 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
221 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
222 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
223 { BFD_RELOC_32, R_X86_64_32, },
224 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
225 { BFD_RELOC_16, R_X86_64_16, },
226 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
227 { BFD_RELOC_8, R_X86_64_8, },
228 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
229 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
230 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
231 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
232 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
233 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
234 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
235 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
236 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
237 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
238 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
239 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
240 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
241 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
242 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
243 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
244 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
245 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
246 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
247 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
248 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
249 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
250 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
251 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
252 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
255 static reloc_howto_type *
256 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
260 if (r_type == (unsigned int) R_X86_64_32)
265 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
267 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
268 || r_type >= (unsigned int) R_X86_64_max)
270 if (r_type >= (unsigned int) R_X86_64_standard)
272 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
274 r_type = R_X86_64_NONE;
279 i = r_type - (unsigned int) R_X86_64_vt_offset;
280 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
281 return &x86_64_elf_howto_table[i];
284 /* Given a BFD reloc type, return a HOWTO structure. */
285 static reloc_howto_type *
286 elf_x86_64_reloc_type_lookup (bfd *abfd,
287 bfd_reloc_code_real_type code)
291 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
294 if (x86_64_reloc_map[i].bfd_reloc_val == code)
295 return elf_x86_64_rtype_to_howto (abfd,
296 x86_64_reloc_map[i].elf_reloc_val);
301 static reloc_howto_type *
302 elf_x86_64_reloc_name_lookup (bfd *abfd,
307 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
309 /* Get x32 R_X86_64_32. */
310 reloc_howto_type *reloc
311 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
312 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
316 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
317 if (x86_64_elf_howto_table[i].name != NULL
318 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
319 return &x86_64_elf_howto_table[i];
324 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
327 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
328 Elf_Internal_Rela *dst)
332 r_type = ELF32_R_TYPE (dst->r_info);
333 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
334 BFD_ASSERT (r_type == cache_ptr->howto->type);
337 /* Support for core dump NOTE sections. */
339 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
344 switch (note->descsz)
349 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
351 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
354 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
362 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
364 elf_tdata (abfd)->core_signal
365 = bfd_get_16 (abfd, note->descdata + 12);
368 elf_tdata (abfd)->core_lwpid
369 = bfd_get_32 (abfd, note->descdata + 32);
378 /* Make a ".reg/999" section. */
379 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
380 size, note->descpos + offset);
384 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
386 switch (note->descsz)
391 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
392 elf_tdata (abfd)->core_pid
393 = bfd_get_32 (abfd, note->descdata + 12);
394 elf_tdata (abfd)->core_program
395 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
396 elf_tdata (abfd)->core_command
397 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
400 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
401 elf_tdata (abfd)->core_pid
402 = bfd_get_32 (abfd, note->descdata + 24);
403 elf_tdata (abfd)->core_program
404 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
405 elf_tdata (abfd)->core_command
406 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
409 /* Note that for some reason, a spurious space is tacked
410 onto the end of the args in some (at least one anyway)
411 implementations, so strip it off if it exists. */
414 char *command = elf_tdata (abfd)->core_command;
415 int n = strlen (command);
417 if (0 < n && command[n - 1] == ' ')
418 command[n - 1] = '\0';
426 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
429 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
431 const char *fname, *psargs;
442 va_start (ap, note_type);
443 fname = va_arg (ap, const char *);
444 psargs = va_arg (ap, const char *);
447 if (bed->s->elfclass == ELFCLASS32)
450 memset (&data, 0, sizeof (data));
451 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
452 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
453 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
454 &data, sizeof (data));
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 va_start (ap, note_type);
469 pid = va_arg (ap, long);
470 cursig = va_arg (ap, int);
471 gregs = va_arg (ap, const void *);
474 if (bed->s->elfclass == ELFCLASS32)
476 if (bed->elf_machine_code == EM_X86_64)
478 prstatusx32_t prstat;
479 memset (&prstat, 0, sizeof (prstat));
481 prstat.pr_cursig = cursig;
482 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
483 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
484 &prstat, sizeof (prstat));
489 memset (&prstat, 0, sizeof (prstat));
491 prstat.pr_cursig = cursig;
492 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
493 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
494 &prstat, sizeof (prstat));
500 memset (&prstat, 0, sizeof (prstat));
502 prstat.pr_cursig = cursig;
503 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
504 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
505 &prstat, sizeof (prstat));
512 /* Functions for the x86-64 ELF linker. */
514 /* The name of the dynamic interpreter. This is put in the .interp
517 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
518 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
520 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
521 copying dynamic variables from a shared lib into an app's dynbss
522 section, and instead use a dynamic relocation to point into the
524 #define ELIMINATE_COPY_RELOCS 1
526 /* The size in bytes of an entry in the global offset table. */
528 #define GOT_ENTRY_SIZE 8
530 /* The size in bytes of an entry in the procedure linkage table. */
532 #define PLT_ENTRY_SIZE 16
534 /* The first entry in a procedure linkage table looks like this. See the
535 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
537 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
539 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
540 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
541 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
544 /* Subsequent entries in a procedure linkage table look like this. */
546 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
548 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
549 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
550 0x68, /* pushq immediate */
551 0, 0, 0, 0, /* replaced with index into relocation table. */
552 0xe9, /* jmp relative */
553 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
556 /* .eh_frame covering the .plt section. */
558 static const bfd_byte elf_x86_64_eh_frame_plt[] =
560 #define PLT_CIE_LENGTH 20
561 #define PLT_FDE_LENGTH 36
562 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
563 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
564 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
565 0, 0, 0, 0, /* CIE ID */
567 'z', 'R', 0, /* Augmentation string */
568 1, /* Code alignment factor */
569 0x78, /* Data alignment factor */
570 16, /* Return address column */
571 1, /* Augmentation size */
572 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
573 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
574 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
575 DW_CFA_nop, DW_CFA_nop,
577 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
578 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
579 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
580 0, 0, 0, 0, /* .plt size goes here */
581 0, /* Augmentation size */
582 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
583 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
584 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
585 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
586 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
587 11, /* Block length */
588 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
589 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
590 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
591 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
592 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
595 /* Architecture-specific backend data for x86-64. */
597 struct elf_x86_64_backend_data
599 /* Templates for the initial PLT entry and for subsequent entries. */
600 const bfd_byte *plt0_entry;
601 const bfd_byte *plt_entry;
602 unsigned int plt_entry_size; /* Size of each PLT entry. */
604 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
605 unsigned int plt0_got1_offset;
606 unsigned int plt0_got2_offset;
608 /* Offset of the end of the PC-relative instruction containing
610 unsigned int plt0_got2_insn_end;
612 /* Offsets into plt_entry that are to be replaced with... */
613 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
614 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
615 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
617 /* Length of the PC-relative instruction containing plt_got_offset. */
618 unsigned int plt_got_insn_size;
620 /* Offset of the end of the PC-relative jump to plt0_entry. */
621 unsigned int plt_plt_insn_end;
623 /* Offset into plt_entry where the initial value of the GOT entry points. */
624 unsigned int plt_lazy_offset;
626 /* .eh_frame covering the .plt section. */
627 const bfd_byte *eh_frame_plt;
628 unsigned int eh_frame_plt_size;
631 #define get_elf_x86_64_backend_data(abfd) \
632 ((const struct elf_x86_64_backend_data *) \
633 get_elf_backend_data (abfd)->arch_data)
635 #define GET_PLT_ENTRY_SIZE(abfd) \
636 get_elf_x86_64_backend_data (abfd)->plt_entry_size
638 /* These are the standard parameters. */
639 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
641 elf_x86_64_plt0_entry, /* plt0_entry */
642 elf_x86_64_plt_entry, /* plt_entry */
643 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
644 2, /* plt0_got1_offset */
645 8, /* plt0_got2_offset */
646 12, /* plt0_got2_insn_end */
647 2, /* plt_got_offset */
648 7, /* plt_reloc_offset */
649 12, /* plt_plt_offset */
650 6, /* plt_got_insn_size */
651 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
652 6, /* plt_lazy_offset */
653 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
654 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
657 #define elf_backend_arch_data &elf_x86_64_arch_bed
659 /* x86-64 ELF linker hash entry. */
661 struct elf_x86_64_link_hash_entry
663 struct elf_link_hash_entry elf;
665 /* Track dynamic relocs copied for this symbol. */
666 struct elf_dyn_relocs *dyn_relocs;
668 #define GOT_UNKNOWN 0
672 #define GOT_TLS_GDESC 4
673 #define GOT_TLS_GD_BOTH_P(type) \
674 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
675 #define GOT_TLS_GD_P(type) \
676 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
677 #define GOT_TLS_GDESC_P(type) \
678 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
679 #define GOT_TLS_GD_ANY_P(type) \
680 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
681 unsigned char tls_type;
683 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
684 starting at the end of the jump table. */
688 #define elf_x86_64_hash_entry(ent) \
689 ((struct elf_x86_64_link_hash_entry *)(ent))
691 struct elf_x86_64_obj_tdata
693 struct elf_obj_tdata root;
695 /* tls_type for each local got entry. */
696 char *local_got_tls_type;
698 /* GOTPLT entries for TLS descriptors. */
699 bfd_vma *local_tlsdesc_gotent;
702 #define elf_x86_64_tdata(abfd) \
703 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
705 #define elf_x86_64_local_got_tls_type(abfd) \
706 (elf_x86_64_tdata (abfd)->local_got_tls_type)
708 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
709 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
711 #define is_x86_64_elf(bfd) \
712 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
713 && elf_tdata (bfd) != NULL \
714 && elf_object_id (bfd) == X86_64_ELF_DATA)
717 elf_x86_64_mkobject (bfd *abfd)
719 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
723 /* x86-64 ELF linker hash table. */
725 struct elf_x86_64_link_hash_table
727 struct elf_link_hash_table elf;
729 /* Short-cuts to get to dynamic linker sections. */
732 asection *plt_eh_frame;
736 bfd_signed_vma refcount;
740 /* The amount of space used by the jump slots in the GOT. */
741 bfd_vma sgotplt_jump_table_size;
743 /* Small local sym cache. */
744 struct sym_cache sym_cache;
746 bfd_vma (*r_info) (bfd_vma, bfd_vma);
747 bfd_vma (*r_sym) (bfd_vma);
748 unsigned int pointer_r_type;
749 const char *dynamic_interpreter;
750 int dynamic_interpreter_size;
752 /* _TLS_MODULE_BASE_ symbol. */
753 struct bfd_link_hash_entry *tls_module_base;
755 /* Used by local STT_GNU_IFUNC symbols. */
756 htab_t loc_hash_table;
757 void * loc_hash_memory;
759 /* The offset into splt of the PLT entry for the TLS descriptor
760 resolver. Special values are 0, if not necessary (or not found
761 to be necessary yet), and -1 if needed but not determined
764 /* The offset into sgot of the GOT entry used by the PLT entry
768 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
769 bfd_vma next_jump_slot_index;
770 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
771 bfd_vma next_irelative_index;
774 /* Get the x86-64 ELF linker hash table from a link_info structure. */
776 #define elf_x86_64_hash_table(p) \
777 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
778 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
780 #define elf_x86_64_compute_jump_table_size(htab) \
781 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
783 /* Create an entry in an x86-64 ELF linker hash table. */
785 static struct bfd_hash_entry *
786 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
787 struct bfd_hash_table *table,
790 /* Allocate the structure if it has not already been allocated by a
794 entry = (struct bfd_hash_entry *)
795 bfd_hash_allocate (table,
796 sizeof (struct elf_x86_64_link_hash_entry));
801 /* Call the allocation method of the superclass. */
802 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
805 struct elf_x86_64_link_hash_entry *eh;
807 eh = (struct elf_x86_64_link_hash_entry *) entry;
808 eh->dyn_relocs = NULL;
809 eh->tls_type = GOT_UNKNOWN;
810 eh->tlsdesc_got = (bfd_vma) -1;
816 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
817 for local symbol so that we can handle local STT_GNU_IFUNC symbols
818 as global symbol. We reuse indx and dynstr_index for local symbol
819 hash since they aren't used by global symbols in this backend. */
822 elf_x86_64_local_htab_hash (const void *ptr)
824 struct elf_link_hash_entry *h
825 = (struct elf_link_hash_entry *) ptr;
826 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
829 /* Compare local hash entries. */
832 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
834 struct elf_link_hash_entry *h1
835 = (struct elf_link_hash_entry *) ptr1;
836 struct elf_link_hash_entry *h2
837 = (struct elf_link_hash_entry *) ptr2;
839 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
842 /* Find and/or create a hash entry for local symbol. */
844 static struct elf_link_hash_entry *
845 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
846 bfd *abfd, const Elf_Internal_Rela *rel,
849 struct elf_x86_64_link_hash_entry e, *ret;
850 asection *sec = abfd->sections;
851 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
852 htab->r_sym (rel->r_info));
855 e.elf.indx = sec->id;
856 e.elf.dynstr_index = htab->r_sym (rel->r_info);
857 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
858 create ? INSERT : NO_INSERT);
865 ret = (struct elf_x86_64_link_hash_entry *) *slot;
869 ret = (struct elf_x86_64_link_hash_entry *)
870 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
871 sizeof (struct elf_x86_64_link_hash_entry));
874 memset (ret, 0, sizeof (*ret));
875 ret->elf.indx = sec->id;
876 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
877 ret->elf.dynindx = -1;
883 /* Create an X86-64 ELF linker hash table. */
885 static struct bfd_link_hash_table *
886 elf_x86_64_link_hash_table_create (bfd *abfd)
888 struct elf_x86_64_link_hash_table *ret;
889 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
891 ret = (struct elf_x86_64_link_hash_table *) bfd_malloc (amt);
895 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
896 elf_x86_64_link_hash_newfunc,
897 sizeof (struct elf_x86_64_link_hash_entry),
906 ret->plt_eh_frame = NULL;
907 ret->sym_cache.abfd = NULL;
908 ret->tlsdesc_plt = 0;
909 ret->tlsdesc_got = 0;
910 ret->tls_ld_got.refcount = 0;
911 ret->sgotplt_jump_table_size = 0;
912 ret->tls_module_base = NULL;
913 ret->next_jump_slot_index = 0;
914 ret->next_irelative_index = 0;
918 ret->r_info = elf64_r_info;
919 ret->r_sym = elf64_r_sym;
920 ret->pointer_r_type = R_X86_64_64;
921 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
922 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
926 ret->r_info = elf32_r_info;
927 ret->r_sym = elf32_r_sym;
928 ret->pointer_r_type = R_X86_64_32;
929 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
930 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
933 ret->loc_hash_table = htab_try_create (1024,
934 elf_x86_64_local_htab_hash,
935 elf_x86_64_local_htab_eq,
937 ret->loc_hash_memory = objalloc_create ();
938 if (!ret->loc_hash_table || !ret->loc_hash_memory)
944 return &ret->elf.root;
947 /* Destroy an X86-64 ELF linker hash table. */
950 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
952 struct elf_x86_64_link_hash_table *htab
953 = (struct elf_x86_64_link_hash_table *) hash;
955 if (htab->loc_hash_table)
956 htab_delete (htab->loc_hash_table);
957 if (htab->loc_hash_memory)
958 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
959 _bfd_generic_link_hash_table_free (hash);
962 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
963 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
967 elf_x86_64_create_dynamic_sections (bfd *dynobj,
968 struct bfd_link_info *info)
970 struct elf_x86_64_link_hash_table *htab;
972 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
975 htab = elf_x86_64_hash_table (info);
979 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
981 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
984 || (!info->shared && !htab->srelbss))
987 if (!info->no_ld_generated_unwind_info
988 && htab->plt_eh_frame == NULL
989 && htab->elf.splt != NULL)
991 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
992 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
993 | SEC_LINKER_CREATED);
995 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
996 if (htab->plt_eh_frame == NULL
997 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
1003 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1006 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1007 struct elf_link_hash_entry *dir,
1008 struct elf_link_hash_entry *ind)
1010 struct elf_x86_64_link_hash_entry *edir, *eind;
1012 edir = (struct elf_x86_64_link_hash_entry *) dir;
1013 eind = (struct elf_x86_64_link_hash_entry *) ind;
1015 if (eind->dyn_relocs != NULL)
1017 if (edir->dyn_relocs != NULL)
1019 struct elf_dyn_relocs **pp;
1020 struct elf_dyn_relocs *p;
1022 /* Add reloc counts against the indirect sym to the direct sym
1023 list. Merge any entries against the same section. */
1024 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1026 struct elf_dyn_relocs *q;
1028 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1029 if (q->sec == p->sec)
1031 q->pc_count += p->pc_count;
1032 q->count += p->count;
1039 *pp = edir->dyn_relocs;
1042 edir->dyn_relocs = eind->dyn_relocs;
1043 eind->dyn_relocs = NULL;
1046 if (ind->root.type == bfd_link_hash_indirect
1047 && dir->got.refcount <= 0)
1049 edir->tls_type = eind->tls_type;
1050 eind->tls_type = GOT_UNKNOWN;
1053 if (ELIMINATE_COPY_RELOCS
1054 && ind->root.type != bfd_link_hash_indirect
1055 && dir->dynamic_adjusted)
1057 /* If called to transfer flags for a weakdef during processing
1058 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1059 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1060 dir->ref_dynamic |= ind->ref_dynamic;
1061 dir->ref_regular |= ind->ref_regular;
1062 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1063 dir->needs_plt |= ind->needs_plt;
1064 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1067 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1071 elf64_x86_64_elf_object_p (bfd *abfd)
1073 /* Set the right machine number for an x86-64 elf64 file. */
1074 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1079 elf32_x86_64_elf_object_p (bfd *abfd)
1081 /* Set the right machine number for an x86-64 elf32 file. */
1082 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1086 /* Return TRUE if the TLS access code sequence support transition
1090 elf_x86_64_check_tls_transition (bfd *abfd,
1091 struct bfd_link_info *info,
1094 Elf_Internal_Shdr *symtab_hdr,
1095 struct elf_link_hash_entry **sym_hashes,
1096 unsigned int r_type,
1097 const Elf_Internal_Rela *rel,
1098 const Elf_Internal_Rela *relend)
1101 unsigned long r_symndx;
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. */
1141 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1142 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1144 if ((offset + 12) > sec->size
1145 || memcmp (contents + offset + 4, call, 4) != 0)
1148 if (ABI_64_P (abfd))
1151 || memcmp (contents + offset - 4, leaq, 4) != 0)
1157 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1163 /* Check transition from LD access model. Only
1164 leaq foo@tlsld(%rip), %rdi;
1166 can transit to different access model. */
1168 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1170 if (offset < 3 || (offset + 9) > sec->size)
1173 if (memcmp (contents + offset - 3, lea, 3) != 0
1174 || 0xe8 != *(contents + offset + 4))
1178 r_symndx = htab->r_sym (rel[1].r_info);
1179 if (r_symndx < symtab_hdr->sh_info)
1182 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1183 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1184 may be versioned. */
1186 && h->root.root.string != NULL
1187 && (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1188 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
1189 && (strncmp (h->root.root.string,
1190 "__tls_get_addr", 14) == 0));
1192 case R_X86_64_GOTTPOFF:
1193 /* Check transition from IE access model:
1194 mov foo@gottpoff(%rip), %reg
1195 add foo@gottpoff(%rip), %reg
1198 /* Check REX prefix first. */
1199 if (offset >= 3 && (offset + 4) <= sec->size)
1201 val = bfd_get_8 (abfd, contents + offset - 3);
1202 if (val != 0x48 && val != 0x4c)
1204 /* X32 may have 0x44 REX prefix or no REX prefix. */
1205 if (ABI_64_P (abfd))
1211 /* X32 may not have any REX prefix. */
1212 if (ABI_64_P (abfd))
1214 if (offset < 2 || (offset + 3) > sec->size)
1218 val = bfd_get_8 (abfd, contents + offset - 2);
1219 if (val != 0x8b && val != 0x03)
1222 val = bfd_get_8 (abfd, contents + offset - 1);
1223 return (val & 0xc7) == 5;
1225 case R_X86_64_GOTPC32_TLSDESC:
1226 /* Check transition from GDesc access model:
1227 leaq x@tlsdesc(%rip), %rax
1229 Make sure it's a leaq adding rip to a 32-bit offset
1230 into any register, although it's probably almost always
1233 if (offset < 3 || (offset + 4) > sec->size)
1236 val = bfd_get_8 (abfd, contents + offset - 3);
1237 if ((val & 0xfb) != 0x48)
1240 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1243 val = bfd_get_8 (abfd, contents + offset - 1);
1244 return (val & 0xc7) == 0x05;
1246 case R_X86_64_TLSDESC_CALL:
1247 /* Check transition from GDesc access model:
1248 call *x@tlsdesc(%rax)
1250 if (offset + 2 <= sec->size)
1252 /* Make sure that it's a call *x@tlsdesc(%rax). */
1253 static const unsigned char call[] = { 0xff, 0x10 };
1254 return memcmp (contents + offset, call, 2) == 0;
1264 /* Return TRUE if the TLS access transition is OK or no transition
1265 will be performed. Update R_TYPE if there is a transition. */
1268 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1269 asection *sec, bfd_byte *contents,
1270 Elf_Internal_Shdr *symtab_hdr,
1271 struct elf_link_hash_entry **sym_hashes,
1272 unsigned int *r_type, int tls_type,
1273 const Elf_Internal_Rela *rel,
1274 const Elf_Internal_Rela *relend,
1275 struct elf_link_hash_entry *h,
1276 unsigned long r_symndx)
1278 unsigned int from_type = *r_type;
1279 unsigned int to_type = from_type;
1280 bfd_boolean check = TRUE;
1282 /* Skip TLS transition for functions. */
1284 && (h->type == STT_FUNC
1285 || h->type == STT_GNU_IFUNC))
1290 case R_X86_64_TLSGD:
1291 case R_X86_64_GOTPC32_TLSDESC:
1292 case R_X86_64_TLSDESC_CALL:
1293 case R_X86_64_GOTTPOFF:
1294 if (info->executable)
1297 to_type = R_X86_64_TPOFF32;
1299 to_type = R_X86_64_GOTTPOFF;
1302 /* When we are called from elf_x86_64_relocate_section,
1303 CONTENTS isn't NULL and there may be additional transitions
1304 based on TLS_TYPE. */
1305 if (contents != NULL)
1307 unsigned int new_to_type = to_type;
1309 if (info->executable
1312 && tls_type == GOT_TLS_IE)
1313 new_to_type = R_X86_64_TPOFF32;
1315 if (to_type == R_X86_64_TLSGD
1316 || to_type == R_X86_64_GOTPC32_TLSDESC
1317 || to_type == R_X86_64_TLSDESC_CALL)
1319 if (tls_type == GOT_TLS_IE)
1320 new_to_type = R_X86_64_GOTTPOFF;
1323 /* We checked the transition before when we were called from
1324 elf_x86_64_check_relocs. We only want to check the new
1325 transition which hasn't been checked before. */
1326 check = new_to_type != to_type && from_type == to_type;
1327 to_type = new_to_type;
1332 case R_X86_64_TLSLD:
1333 if (info->executable)
1334 to_type = R_X86_64_TPOFF32;
1341 /* Return TRUE if there is no transition. */
1342 if (from_type == to_type)
1345 /* Check if the transition can be performed. */
1347 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1348 symtab_hdr, sym_hashes,
1349 from_type, rel, relend))
1351 reloc_howto_type *from, *to;
1354 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1355 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1358 name = h->root.root.string;
1361 struct elf_x86_64_link_hash_table *htab;
1363 htab = elf_x86_64_hash_table (info);
1368 Elf_Internal_Sym *isym;
1370 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1372 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1376 (*_bfd_error_handler)
1377 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1378 "in section `%A' failed"),
1379 abfd, sec, from->name, to->name, name,
1380 (unsigned long) rel->r_offset);
1381 bfd_set_error (bfd_error_bad_value);
1389 /* Look through the relocs for a section during the first phase, and
1390 calculate needed space in the global offset table, procedure
1391 linkage table, and dynamic reloc sections. */
1394 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1396 const Elf_Internal_Rela *relocs)
1398 struct elf_x86_64_link_hash_table *htab;
1399 Elf_Internal_Shdr *symtab_hdr;
1400 struct elf_link_hash_entry **sym_hashes;
1401 const Elf_Internal_Rela *rel;
1402 const Elf_Internal_Rela *rel_end;
1405 if (info->relocatable)
1408 BFD_ASSERT (is_x86_64_elf (abfd));
1410 htab = elf_x86_64_hash_table (info);
1414 symtab_hdr = &elf_symtab_hdr (abfd);
1415 sym_hashes = elf_sym_hashes (abfd);
1419 rel_end = relocs + sec->reloc_count;
1420 for (rel = relocs; rel < rel_end; rel++)
1422 unsigned int r_type;
1423 unsigned long r_symndx;
1424 struct elf_link_hash_entry *h;
1425 Elf_Internal_Sym *isym;
1428 r_symndx = htab->r_sym (rel->r_info);
1429 r_type = ELF32_R_TYPE (rel->r_info);
1431 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1433 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1438 if (r_symndx < symtab_hdr->sh_info)
1440 /* A local symbol. */
1441 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1446 /* Check relocation against local STT_GNU_IFUNC symbol. */
1447 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1449 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1454 /* Fake a STT_GNU_IFUNC symbol. */
1455 h->type = STT_GNU_IFUNC;
1458 h->forced_local = 1;
1459 h->root.type = bfd_link_hash_defined;
1467 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1468 while (h->root.type == bfd_link_hash_indirect
1469 || h->root.type == bfd_link_hash_warning)
1470 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1473 /* Check invalid x32 relocations. */
1474 if (!ABI_64_P (abfd))
1480 case R_X86_64_DTPOFF64:
1481 case R_X86_64_TPOFF64:
1483 case R_X86_64_GOTOFF64:
1484 case R_X86_64_GOT64:
1485 case R_X86_64_GOTPCREL64:
1486 case R_X86_64_GOTPC64:
1487 case R_X86_64_GOTPLT64:
1488 case R_X86_64_PLTOFF64:
1491 name = h->root.root.string;
1493 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1495 (*_bfd_error_handler)
1496 (_("%B: relocation %s against symbol `%s' isn't "
1497 "supported in x32 mode"), abfd,
1498 x86_64_elf_howto_table[r_type].name, name);
1499 bfd_set_error (bfd_error_bad_value);
1507 /* Create the ifunc sections for static executables. If we
1508 never see an indirect function symbol nor we are building
1509 a static executable, those sections will be empty and
1510 won't appear in output. */
1521 case R_X86_64_PLT32:
1522 case R_X86_64_GOTPCREL:
1523 case R_X86_64_GOTPCREL64:
1524 if (htab->elf.dynobj == NULL)
1525 htab->elf.dynobj = abfd;
1526 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1531 /* It is referenced by a non-shared object. */
1535 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1536 symtab_hdr, sym_hashes,
1537 &r_type, GOT_UNKNOWN,
1538 rel, rel_end, h, r_symndx))
1543 case R_X86_64_TLSLD:
1544 htab->tls_ld_got.refcount += 1;
1547 case R_X86_64_TPOFF32:
1548 if (!info->executable && ABI_64_P (abfd))
1551 name = h->root.root.string;
1553 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1555 (*_bfd_error_handler)
1556 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1558 x86_64_elf_howto_table[r_type].name, name);
1559 bfd_set_error (bfd_error_bad_value);
1564 case R_X86_64_GOTTPOFF:
1565 if (!info->executable)
1566 info->flags |= DF_STATIC_TLS;
1569 case R_X86_64_GOT32:
1570 case R_X86_64_GOTPCREL:
1571 case R_X86_64_TLSGD:
1572 case R_X86_64_GOT64:
1573 case R_X86_64_GOTPCREL64:
1574 case R_X86_64_GOTPLT64:
1575 case R_X86_64_GOTPC32_TLSDESC:
1576 case R_X86_64_TLSDESC_CALL:
1577 /* This symbol requires a global offset table entry. */
1579 int tls_type, old_tls_type;
1583 default: tls_type = GOT_NORMAL; break;
1584 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1585 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1586 case R_X86_64_GOTPC32_TLSDESC:
1587 case R_X86_64_TLSDESC_CALL:
1588 tls_type = GOT_TLS_GDESC; break;
1593 if (r_type == R_X86_64_GOTPLT64)
1595 /* This relocation indicates that we also need
1596 a PLT entry, as this is a function. We don't need
1597 a PLT entry for local symbols. */
1599 h->plt.refcount += 1;
1601 h->got.refcount += 1;
1602 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1606 bfd_signed_vma *local_got_refcounts;
1608 /* This is a global offset table entry for a local symbol. */
1609 local_got_refcounts = elf_local_got_refcounts (abfd);
1610 if (local_got_refcounts == NULL)
1614 size = symtab_hdr->sh_info;
1615 size *= sizeof (bfd_signed_vma)
1616 + sizeof (bfd_vma) + sizeof (char);
1617 local_got_refcounts = ((bfd_signed_vma *)
1618 bfd_zalloc (abfd, size));
1619 if (local_got_refcounts == NULL)
1621 elf_local_got_refcounts (abfd) = local_got_refcounts;
1622 elf_x86_64_local_tlsdesc_gotent (abfd)
1623 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1624 elf_x86_64_local_got_tls_type (abfd)
1625 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1627 local_got_refcounts[r_symndx] += 1;
1629 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1632 /* If a TLS symbol is accessed using IE at least once,
1633 there is no point to use dynamic model for it. */
1634 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1635 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1636 || tls_type != GOT_TLS_IE))
1638 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1639 tls_type = old_tls_type;
1640 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1641 && GOT_TLS_GD_ANY_P (tls_type))
1642 tls_type |= old_tls_type;
1646 name = h->root.root.string;
1648 name = bfd_elf_sym_name (abfd, symtab_hdr,
1650 (*_bfd_error_handler)
1651 (_("%B: '%s' accessed both as normal and thread local symbol"),
1653 bfd_set_error (bfd_error_bad_value);
1658 if (old_tls_type != tls_type)
1661 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1663 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1668 case R_X86_64_GOTOFF64:
1669 case R_X86_64_GOTPC32:
1670 case R_X86_64_GOTPC64:
1672 if (htab->elf.sgot == NULL)
1674 if (htab->elf.dynobj == NULL)
1675 htab->elf.dynobj = abfd;
1676 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1682 case R_X86_64_PLT32:
1683 /* This symbol requires a procedure linkage table entry. We
1684 actually build the entry in adjust_dynamic_symbol,
1685 because this might be a case of linking PIC code which is
1686 never referenced by a dynamic object, in which case we
1687 don't need to generate a procedure linkage table entry
1690 /* If this is a local symbol, we resolve it directly without
1691 creating a procedure linkage table entry. */
1696 h->plt.refcount += 1;
1699 case R_X86_64_PLTOFF64:
1700 /* This tries to form the 'address' of a function relative
1701 to GOT. For global symbols we need a PLT entry. */
1705 h->plt.refcount += 1;
1709 case R_X86_64_SIZE32:
1710 case R_X86_64_SIZE64:
1714 if (!ABI_64_P (abfd))
1719 /* Let's help debug shared library creation. These relocs
1720 cannot be used in shared libs. Don't error out for
1721 sections we don't care about, such as debug sections or
1722 non-constant sections. */
1724 && (sec->flags & SEC_ALLOC) != 0
1725 && (sec->flags & SEC_READONLY) != 0)
1728 name = h->root.root.string;
1730 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1731 (*_bfd_error_handler)
1732 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1733 abfd, x86_64_elf_howto_table[r_type].name, name);
1734 bfd_set_error (bfd_error_bad_value);
1745 if (h != NULL && info->executable)
1747 /* If this reloc is in a read-only section, we might
1748 need a copy reloc. We can't check reliably at this
1749 stage whether the section is read-only, as input
1750 sections have not yet been mapped to output sections.
1751 Tentatively set the flag for now, and correct in
1752 adjust_dynamic_symbol. */
1755 /* We may need a .plt entry if the function this reloc
1756 refers to is in a shared lib. */
1757 h->plt.refcount += 1;
1758 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1759 h->pointer_equality_needed = 1;
1763 /* If we are creating a shared library, and this is a reloc
1764 against a global symbol, or a non PC relative reloc
1765 against a local symbol, then we need to copy the reloc
1766 into the shared library. However, if we are linking with
1767 -Bsymbolic, we do not need to copy a reloc against a
1768 global symbol which is defined in an object we are
1769 including in the link (i.e., DEF_REGULAR is set). At
1770 this point we have not seen all the input files, so it is
1771 possible that DEF_REGULAR is not set now but will be set
1772 later (it is never cleared). In case of a weak definition,
1773 DEF_REGULAR may be cleared later by a strong definition in
1774 a shared library. We account for that possibility below by
1775 storing information in the relocs_copied field of the hash
1776 table entry. A similar situation occurs when creating
1777 shared libraries and symbol visibility changes render the
1780 If on the other hand, we are creating an executable, we
1781 may need to keep relocations for symbols satisfied by a
1782 dynamic library if we manage to avoid copy relocs for the
1785 && (sec->flags & SEC_ALLOC) != 0
1786 && (! IS_X86_64_PCREL_TYPE (r_type)
1788 && (! SYMBOLIC_BIND (info, h)
1789 || h->root.type == bfd_link_hash_defweak
1790 || !h->def_regular))))
1791 || (ELIMINATE_COPY_RELOCS
1793 && (sec->flags & SEC_ALLOC) != 0
1795 && (h->root.type == bfd_link_hash_defweak
1796 || !h->def_regular)))
1798 struct elf_dyn_relocs *p;
1799 struct elf_dyn_relocs **head;
1801 /* We must copy these reloc types into the output file.
1802 Create a reloc section in dynobj and make room for
1806 if (htab->elf.dynobj == NULL)
1807 htab->elf.dynobj = abfd;
1809 sreloc = _bfd_elf_make_dynamic_reloc_section
1810 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1811 abfd, /*rela?*/ TRUE);
1817 /* If this is a global symbol, we count the number of
1818 relocations we need for this symbol. */
1821 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
1825 /* Track dynamic relocs needed for local syms too.
1826 We really need local syms available to do this
1831 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1836 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1840 /* Beware of type punned pointers vs strict aliasing
1842 vpp = &(elf_section_data (s)->local_dynrel);
1843 head = (struct elf_dyn_relocs **)vpp;
1847 if (p == NULL || p->sec != sec)
1849 bfd_size_type amt = sizeof *p;
1851 p = ((struct elf_dyn_relocs *)
1852 bfd_alloc (htab->elf.dynobj, amt));
1863 if (IS_X86_64_PCREL_TYPE (r_type))
1868 /* This relocation describes the C++ object vtable hierarchy.
1869 Reconstruct it for later use during GC. */
1870 case R_X86_64_GNU_VTINHERIT:
1871 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1875 /* This relocation describes which C++ vtable entries are actually
1876 used. Record for later use during GC. */
1877 case R_X86_64_GNU_VTENTRY:
1878 BFD_ASSERT (h != NULL);
1880 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1892 /* Return the section that should be marked against GC for a given
1896 elf_x86_64_gc_mark_hook (asection *sec,
1897 struct bfd_link_info *info,
1898 Elf_Internal_Rela *rel,
1899 struct elf_link_hash_entry *h,
1900 Elf_Internal_Sym *sym)
1903 switch (ELF32_R_TYPE (rel->r_info))
1905 case R_X86_64_GNU_VTINHERIT:
1906 case R_X86_64_GNU_VTENTRY:
1910 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1913 /* Update the got entry reference counts for the section being removed. */
1916 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1918 const Elf_Internal_Rela *relocs)
1920 struct elf_x86_64_link_hash_table *htab;
1921 Elf_Internal_Shdr *symtab_hdr;
1922 struct elf_link_hash_entry **sym_hashes;
1923 bfd_signed_vma *local_got_refcounts;
1924 const Elf_Internal_Rela *rel, *relend;
1926 if (info->relocatable)
1929 htab = elf_x86_64_hash_table (info);
1933 elf_section_data (sec)->local_dynrel = NULL;
1935 symtab_hdr = &elf_symtab_hdr (abfd);
1936 sym_hashes = elf_sym_hashes (abfd);
1937 local_got_refcounts = elf_local_got_refcounts (abfd);
1939 htab = elf_x86_64_hash_table (info);
1940 relend = relocs + sec->reloc_count;
1941 for (rel = relocs; rel < relend; rel++)
1943 unsigned long r_symndx;
1944 unsigned int r_type;
1945 struct elf_link_hash_entry *h = NULL;
1947 r_symndx = htab->r_sym (rel->r_info);
1948 if (r_symndx >= symtab_hdr->sh_info)
1950 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1951 while (h->root.type == bfd_link_hash_indirect
1952 || h->root.type == bfd_link_hash_warning)
1953 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1957 /* A local symbol. */
1958 Elf_Internal_Sym *isym;
1960 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1963 /* Check relocation against local STT_GNU_IFUNC symbol. */
1965 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1967 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
1975 struct elf_x86_64_link_hash_entry *eh;
1976 struct elf_dyn_relocs **pp;
1977 struct elf_dyn_relocs *p;
1979 eh = (struct elf_x86_64_link_hash_entry *) h;
1981 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1984 /* Everything must go for SEC. */
1990 r_type = ELF32_R_TYPE (rel->r_info);
1991 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1992 symtab_hdr, sym_hashes,
1993 &r_type, GOT_UNKNOWN,
1994 rel, relend, h, r_symndx))
1999 case R_X86_64_TLSLD:
2000 if (htab->tls_ld_got.refcount > 0)
2001 htab->tls_ld_got.refcount -= 1;
2004 case R_X86_64_TLSGD:
2005 case R_X86_64_GOTPC32_TLSDESC:
2006 case R_X86_64_TLSDESC_CALL:
2007 case R_X86_64_GOTTPOFF:
2008 case R_X86_64_GOT32:
2009 case R_X86_64_GOTPCREL:
2010 case R_X86_64_GOT64:
2011 case R_X86_64_GOTPCREL64:
2012 case R_X86_64_GOTPLT64:
2015 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
2016 h->plt.refcount -= 1;
2017 if (h->got.refcount > 0)
2018 h->got.refcount -= 1;
2019 if (h->type == STT_GNU_IFUNC)
2021 if (h->plt.refcount > 0)
2022 h->plt.refcount -= 1;
2025 else if (local_got_refcounts != NULL)
2027 if (local_got_refcounts[r_symndx] > 0)
2028 local_got_refcounts[r_symndx] -= 1;
2041 case R_X86_64_SIZE32:
2042 case R_X86_64_SIZE64:
2044 && (h == NULL || h->type != STT_GNU_IFUNC))
2048 case R_X86_64_PLT32:
2049 case R_X86_64_PLTOFF64:
2052 if (h->plt.refcount > 0)
2053 h->plt.refcount -= 1;
2065 /* Adjust a symbol defined by a dynamic object and referenced by a
2066 regular object. The current definition is in some section of the
2067 dynamic object, but we're not including those sections. We have to
2068 change the definition to something the rest of the link can
2072 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2073 struct elf_link_hash_entry *h)
2075 struct elf_x86_64_link_hash_table *htab;
2077 struct elf_x86_64_link_hash_entry *eh;
2078 struct elf_dyn_relocs *p;
2080 /* STT_GNU_IFUNC symbol must go through PLT. */
2081 if (h->type == STT_GNU_IFUNC)
2083 /* All local STT_GNU_IFUNC references must be treate as local
2084 calls via local PLT. */
2086 && SYMBOL_CALLS_LOCAL (info, h))
2088 bfd_size_type pc_count = 0, count = 0;
2089 struct elf_dyn_relocs **pp;
2091 eh = (struct elf_x86_64_link_hash_entry *) h;
2092 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2094 pc_count += p->pc_count;
2095 p->count -= p->pc_count;
2104 if (pc_count || count)
2108 if (h->plt.refcount <= 0)
2109 h->plt.refcount = 1;
2111 h->plt.refcount += 1;
2115 if (h->plt.refcount <= 0)
2117 h->plt.offset = (bfd_vma) -1;
2123 /* If this is a function, put it in the procedure linkage table. We
2124 will fill in the contents of the procedure linkage table later,
2125 when we know the address of the .got section. */
2126 if (h->type == STT_FUNC
2129 if (h->plt.refcount <= 0
2130 || SYMBOL_CALLS_LOCAL (info, h)
2131 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2132 && h->root.type == bfd_link_hash_undefweak))
2134 /* This case can occur if we saw a PLT32 reloc in an input
2135 file, but the symbol was never referred to by a dynamic
2136 object, or if all references were garbage collected. In
2137 such a case, we don't actually need to build a procedure
2138 linkage table, and we can just do a PC32 reloc instead. */
2139 h->plt.offset = (bfd_vma) -1;
2146 /* It's possible that we incorrectly decided a .plt reloc was
2147 needed for an R_X86_64_PC32 reloc to a non-function sym in
2148 check_relocs. We can't decide accurately between function and
2149 non-function syms in check-relocs; Objects loaded later in
2150 the link may change h->type. So fix it now. */
2151 h->plt.offset = (bfd_vma) -1;
2153 /* If this is a weak symbol, and there is a real definition, the
2154 processor independent code will have arranged for us to see the
2155 real definition first, and we can just use the same value. */
2156 if (h->u.weakdef != NULL)
2158 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2159 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2160 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2161 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2162 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2163 h->non_got_ref = h->u.weakdef->non_got_ref;
2167 /* This is a reference to a symbol defined by a dynamic object which
2168 is not a function. */
2170 /* If we are creating a shared library, we must presume that the
2171 only references to the symbol are via the global offset table.
2172 For such cases we need not do anything here; the relocations will
2173 be handled correctly by relocate_section. */
2177 /* If there are no references to this symbol that do not use the
2178 GOT, we don't need to generate a copy reloc. */
2179 if (!h->non_got_ref)
2182 /* If -z nocopyreloc was given, we won't generate them either. */
2183 if (info->nocopyreloc)
2189 if (ELIMINATE_COPY_RELOCS)
2191 eh = (struct elf_x86_64_link_hash_entry *) h;
2192 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2194 s = p->sec->output_section;
2195 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2199 /* If we didn't find any dynamic relocs in read-only sections, then
2200 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2208 /* We must allocate the symbol in our .dynbss section, which will
2209 become part of the .bss section of the executable. There will be
2210 an entry for this symbol in the .dynsym section. The dynamic
2211 object will contain position independent code, so all references
2212 from the dynamic object to this symbol will go through the global
2213 offset table. The dynamic linker will use the .dynsym entry to
2214 determine the address it must put in the global offset table, so
2215 both the dynamic object and the regular object will refer to the
2216 same memory location for the variable. */
2218 htab = elf_x86_64_hash_table (info);
2222 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2223 to copy the initial value out of the dynamic object and into the
2224 runtime process image. */
2225 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2227 const struct elf_backend_data *bed;
2228 bed = get_elf_backend_data (info->output_bfd);
2229 htab->srelbss->size += bed->s->sizeof_rela;
2235 return _bfd_elf_adjust_dynamic_copy (h, s);
2238 /* Allocate space in .plt, .got and associated reloc sections for
2242 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2244 struct bfd_link_info *info;
2245 struct elf_x86_64_link_hash_table *htab;
2246 struct elf_x86_64_link_hash_entry *eh;
2247 struct elf_dyn_relocs *p;
2248 const struct elf_backend_data *bed;
2249 unsigned int plt_entry_size;
2251 if (h->root.type == bfd_link_hash_indirect)
2254 eh = (struct elf_x86_64_link_hash_entry *) h;
2256 info = (struct bfd_link_info *) inf;
2257 htab = elf_x86_64_hash_table (info);
2260 bed = get_elf_backend_data (info->output_bfd);
2261 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2263 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2264 here if it is defined and referenced in a non-shared object. */
2265 if (h->type == STT_GNU_IFUNC
2267 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2271 else if (htab->elf.dynamic_sections_created
2272 && h->plt.refcount > 0)
2274 /* Make sure this symbol is output as a dynamic symbol.
2275 Undefined weak syms won't yet be marked as dynamic. */
2276 if (h->dynindx == -1
2277 && !h->forced_local)
2279 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2284 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2286 asection *s = htab->elf.splt;
2288 /* If this is the first .plt entry, make room for the special
2291 s->size += plt_entry_size;
2293 h->plt.offset = s->size;
2295 /* If this symbol is not defined in a regular file, and we are
2296 not generating a shared library, then set the symbol to this
2297 location in the .plt. This is required to make function
2298 pointers compare as equal between the normal executable and
2299 the shared library. */
2303 h->root.u.def.section = s;
2304 h->root.u.def.value = h->plt.offset;
2307 /* Make room for this entry. */
2308 s->size += plt_entry_size;
2310 /* We also need to make an entry in the .got.plt section, which
2311 will be placed in the .got section by the linker script. */
2312 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2314 /* We also need to make an entry in the .rela.plt section. */
2315 htab->elf.srelplt->size += bed->s->sizeof_rela;
2316 htab->elf.srelplt->reloc_count++;
2320 h->plt.offset = (bfd_vma) -1;
2326 h->plt.offset = (bfd_vma) -1;
2330 eh->tlsdesc_got = (bfd_vma) -1;
2332 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2333 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2334 if (h->got.refcount > 0
2337 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2339 h->got.offset = (bfd_vma) -1;
2341 else if (h->got.refcount > 0)
2345 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2347 /* Make sure this symbol is output as a dynamic symbol.
2348 Undefined weak syms won't yet be marked as dynamic. */
2349 if (h->dynindx == -1
2350 && !h->forced_local)
2352 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2356 if (GOT_TLS_GDESC_P (tls_type))
2358 eh->tlsdesc_got = htab->elf.sgotplt->size
2359 - elf_x86_64_compute_jump_table_size (htab);
2360 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2361 h->got.offset = (bfd_vma) -2;
2363 if (! GOT_TLS_GDESC_P (tls_type)
2364 || GOT_TLS_GD_P (tls_type))
2367 h->got.offset = s->size;
2368 s->size += GOT_ENTRY_SIZE;
2369 if (GOT_TLS_GD_P (tls_type))
2370 s->size += GOT_ENTRY_SIZE;
2372 dyn = htab->elf.dynamic_sections_created;
2373 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2375 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2376 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2377 || tls_type == GOT_TLS_IE)
2378 htab->elf.srelgot->size += bed->s->sizeof_rela;
2379 else if (GOT_TLS_GD_P (tls_type))
2380 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2381 else if (! GOT_TLS_GDESC_P (tls_type)
2382 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2383 || h->root.type != bfd_link_hash_undefweak)
2385 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2386 htab->elf.srelgot->size += bed->s->sizeof_rela;
2387 if (GOT_TLS_GDESC_P (tls_type))
2389 htab->elf.srelplt->size += bed->s->sizeof_rela;
2390 htab->tlsdesc_plt = (bfd_vma) -1;
2394 h->got.offset = (bfd_vma) -1;
2396 if (eh->dyn_relocs == NULL)
2399 /* In the shared -Bsymbolic case, discard space allocated for
2400 dynamic pc-relative relocs against symbols which turn out to be
2401 defined in regular objects. For the normal shared case, discard
2402 space for pc-relative relocs that have become local due to symbol
2403 visibility changes. */
2407 /* Relocs that use pc_count are those that appear on a call
2408 insn, or certain REL relocs that can generated via assembly.
2409 We want calls to protected symbols to resolve directly to the
2410 function rather than going via the plt. If people want
2411 function pointer comparisons to work as expected then they
2412 should avoid writing weird assembly. */
2413 if (SYMBOL_CALLS_LOCAL (info, h))
2415 struct elf_dyn_relocs **pp;
2417 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2419 p->count -= p->pc_count;
2428 /* Also discard relocs on undefined weak syms with non-default
2430 if (eh->dyn_relocs != NULL
2431 && h->root.type == bfd_link_hash_undefweak)
2433 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2434 eh->dyn_relocs = NULL;
2436 /* Make sure undefined weak symbols are output as a dynamic
2438 else if (h->dynindx == -1
2439 && ! h->forced_local
2440 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2445 else if (ELIMINATE_COPY_RELOCS)
2447 /* For the non-shared case, discard space for relocs against
2448 symbols which turn out to need copy relocs or are not
2454 || (htab->elf.dynamic_sections_created
2455 && (h->root.type == bfd_link_hash_undefweak
2456 || h->root.type == bfd_link_hash_undefined))))
2458 /* Make sure this symbol is output as a dynamic symbol.
2459 Undefined weak syms won't yet be marked as dynamic. */
2460 if (h->dynindx == -1
2461 && ! h->forced_local
2462 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2465 /* If that succeeded, we know we'll be keeping all the
2467 if (h->dynindx != -1)
2471 eh->dyn_relocs = NULL;
2476 /* Finally, allocate space. */
2477 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2481 sreloc = elf_section_data (p->sec)->sreloc;
2483 BFD_ASSERT (sreloc != NULL);
2485 sreloc->size += p->count * bed->s->sizeof_rela;
2491 /* Allocate space in .plt, .got and associated reloc sections for
2492 local dynamic relocs. */
2495 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2497 struct elf_link_hash_entry *h
2498 = (struct elf_link_hash_entry *) *slot;
2500 if (h->type != STT_GNU_IFUNC
2504 || h->root.type != bfd_link_hash_defined)
2507 return elf_x86_64_allocate_dynrelocs (h, inf);
2510 /* Find any dynamic relocs that apply to read-only sections. */
2513 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2516 struct elf_x86_64_link_hash_entry *eh;
2517 struct elf_dyn_relocs *p;
2519 /* Skip local IFUNC symbols. */
2520 if (h->forced_local && h->type == STT_GNU_IFUNC)
2523 eh = (struct elf_x86_64_link_hash_entry *) h;
2524 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2526 asection *s = p->sec->output_section;
2528 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2530 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2532 info->flags |= DF_TEXTREL;
2534 if (info->warn_shared_textrel && info->shared)
2535 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2536 p->sec->owner, h->root.root.string,
2539 /* Not an error, just cut short the traversal. */
2547 mov foo@GOTPCREL(%rip), %reg
2550 with the local symbol, foo. */
2553 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2554 struct bfd_link_info *link_info)
2556 Elf_Internal_Shdr *symtab_hdr;
2557 Elf_Internal_Rela *internal_relocs;
2558 Elf_Internal_Rela *irel, *irelend;
2560 struct elf_x86_64_link_hash_table *htab;
2561 bfd_boolean changed_contents;
2562 bfd_boolean changed_relocs;
2563 bfd_signed_vma *local_got_refcounts;
2565 /* Don't even try to convert non-ELF outputs. */
2566 if (!is_elf_hash_table (link_info->hash))
2569 /* Nothing to do if there are no codes, no relocations or no output. */
2570 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2571 || sec->reloc_count == 0
2572 || discarded_section (sec))
2575 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2577 /* Load the relocations for this section. */
2578 internal_relocs = (_bfd_elf_link_read_relocs
2579 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2580 link_info->keep_memory));
2581 if (internal_relocs == NULL)
2584 htab = elf_x86_64_hash_table (link_info);
2585 changed_contents = FALSE;
2586 changed_relocs = FALSE;
2587 local_got_refcounts = elf_local_got_refcounts (abfd);
2589 /* Get the section contents. */
2590 if (elf_section_data (sec)->this_hdr.contents != NULL)
2591 contents = elf_section_data (sec)->this_hdr.contents;
2594 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2598 irelend = internal_relocs + sec->reloc_count;
2599 for (irel = internal_relocs; irel < irelend; irel++)
2601 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2602 unsigned int r_symndx = htab->r_sym (irel->r_info);
2604 struct elf_link_hash_entry *h;
2606 if (r_type != R_X86_64_GOTPCREL)
2609 /* Get the symbol referred to by the reloc. */
2610 if (r_symndx < symtab_hdr->sh_info)
2612 Elf_Internal_Sym *isym;
2614 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2617 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2618 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2619 && bfd_get_8 (input_bfd,
2620 contents + irel->r_offset - 2) == 0x8b)
2622 bfd_put_8 (output_bfd, 0x8d,
2623 contents + irel->r_offset - 2);
2624 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2625 if (local_got_refcounts != NULL
2626 && local_got_refcounts[r_symndx] > 0)
2627 local_got_refcounts[r_symndx] -= 1;
2628 changed_contents = TRUE;
2629 changed_relocs = TRUE;
2634 indx = r_symndx - symtab_hdr->sh_info;
2635 h = elf_sym_hashes (abfd)[indx];
2636 BFD_ASSERT (h != NULL);
2638 while (h->root.type == bfd_link_hash_indirect
2639 || h->root.type == bfd_link_hash_warning)
2640 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2642 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2643 avoid optimizing _DYNAMIC since ld.so may use its link-time
2646 && h->type != STT_GNU_IFUNC
2647 && h != htab->elf.hdynamic
2648 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2649 && bfd_get_8 (input_bfd,
2650 contents + irel->r_offset - 2) == 0x8b)
2652 bfd_put_8 (output_bfd, 0x8d,
2653 contents + irel->r_offset - 2);
2654 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2655 if (h->got.refcount > 0)
2656 h->got.refcount -= 1;
2657 changed_contents = TRUE;
2658 changed_relocs = TRUE;
2662 if (contents != NULL
2663 && elf_section_data (sec)->this_hdr.contents != contents)
2665 if (!changed_contents && !link_info->keep_memory)
2669 /* Cache the section contents for elf_link_input_bfd. */
2670 elf_section_data (sec)->this_hdr.contents = contents;
2674 if (elf_section_data (sec)->relocs != internal_relocs)
2676 if (!changed_relocs)
2677 free (internal_relocs);
2679 elf_section_data (sec)->relocs = internal_relocs;
2685 if (contents != NULL
2686 && elf_section_data (sec)->this_hdr.contents != contents)
2688 if (internal_relocs != NULL
2689 && elf_section_data (sec)->relocs != internal_relocs)
2690 free (internal_relocs);
2694 /* Set the sizes of the dynamic sections. */
2697 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2698 struct bfd_link_info *info)
2700 struct elf_x86_64_link_hash_table *htab;
2705 const struct elf_backend_data *bed;
2707 htab = elf_x86_64_hash_table (info);
2710 bed = get_elf_backend_data (output_bfd);
2712 dynobj = htab->elf.dynobj;
2716 if (htab->elf.dynamic_sections_created)
2718 /* Set the contents of the .interp section to the interpreter. */
2719 if (info->executable)
2721 s = bfd_get_linker_section (dynobj, ".interp");
2724 s->size = htab->dynamic_interpreter_size;
2725 s->contents = (unsigned char *) htab->dynamic_interpreter;
2729 /* Set up .got offsets for local syms, and space for local dynamic
2731 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2733 bfd_signed_vma *local_got;
2734 bfd_signed_vma *end_local_got;
2735 char *local_tls_type;
2736 bfd_vma *local_tlsdesc_gotent;
2737 bfd_size_type locsymcount;
2738 Elf_Internal_Shdr *symtab_hdr;
2741 if (! is_x86_64_elf (ibfd))
2744 for (s = ibfd->sections; s != NULL; s = s->next)
2746 struct elf_dyn_relocs *p;
2748 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
2751 for (p = (struct elf_dyn_relocs *)
2752 (elf_section_data (s)->local_dynrel);
2756 if (!bfd_is_abs_section (p->sec)
2757 && bfd_is_abs_section (p->sec->output_section))
2759 /* Input section has been discarded, either because
2760 it is a copy of a linkonce section or due to
2761 linker script /DISCARD/, so we'll be discarding
2764 else if (p->count != 0)
2766 srel = elf_section_data (p->sec)->sreloc;
2767 srel->size += p->count * bed->s->sizeof_rela;
2768 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2769 && (info->flags & DF_TEXTREL) == 0)
2771 info->flags |= DF_TEXTREL;
2772 if (info->warn_shared_textrel && info->shared)
2773 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2774 p->sec->owner, p->sec);
2780 local_got = elf_local_got_refcounts (ibfd);
2784 symtab_hdr = &elf_symtab_hdr (ibfd);
2785 locsymcount = symtab_hdr->sh_info;
2786 end_local_got = local_got + locsymcount;
2787 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
2788 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
2790 srel = htab->elf.srelgot;
2791 for (; local_got < end_local_got;
2792 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2794 *local_tlsdesc_gotent = (bfd_vma) -1;
2797 if (GOT_TLS_GDESC_P (*local_tls_type))
2799 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2800 - elf_x86_64_compute_jump_table_size (htab);
2801 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2802 *local_got = (bfd_vma) -2;
2804 if (! GOT_TLS_GDESC_P (*local_tls_type)
2805 || GOT_TLS_GD_P (*local_tls_type))
2807 *local_got = s->size;
2808 s->size += GOT_ENTRY_SIZE;
2809 if (GOT_TLS_GD_P (*local_tls_type))
2810 s->size += GOT_ENTRY_SIZE;
2813 || GOT_TLS_GD_ANY_P (*local_tls_type)
2814 || *local_tls_type == GOT_TLS_IE)
2816 if (GOT_TLS_GDESC_P (*local_tls_type))
2818 htab->elf.srelplt->size
2819 += bed->s->sizeof_rela;
2820 htab->tlsdesc_plt = (bfd_vma) -1;
2822 if (! GOT_TLS_GDESC_P (*local_tls_type)
2823 || GOT_TLS_GD_P (*local_tls_type))
2824 srel->size += bed->s->sizeof_rela;
2828 *local_got = (bfd_vma) -1;
2832 if (htab->tls_ld_got.refcount > 0)
2834 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2836 htab->tls_ld_got.offset = htab->elf.sgot->size;
2837 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2838 htab->elf.srelgot->size += bed->s->sizeof_rela;
2841 htab->tls_ld_got.offset = -1;
2843 /* Allocate global sym .plt and .got entries, and space for global
2844 sym dynamic relocs. */
2845 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
2848 /* Allocate .plt and .got entries, and space for local symbols. */
2849 htab_traverse (htab->loc_hash_table,
2850 elf_x86_64_allocate_local_dynrelocs,
2853 /* For every jump slot reserved in the sgotplt, reloc_count is
2854 incremented. However, when we reserve space for TLS descriptors,
2855 it's not incremented, so in order to compute the space reserved
2856 for them, it suffices to multiply the reloc count by the jump
2859 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2860 so that R_X86_64_IRELATIVE entries come last. */
2861 if (htab->elf.srelplt)
2863 htab->sgotplt_jump_table_size
2864 = elf_x86_64_compute_jump_table_size (htab);
2865 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2867 else if (htab->elf.irelplt)
2868 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2870 if (htab->tlsdesc_plt)
2872 /* If we're not using lazy TLS relocations, don't generate the
2873 PLT and GOT entries they require. */
2874 if ((info->flags & DF_BIND_NOW))
2875 htab->tlsdesc_plt = 0;
2878 htab->tlsdesc_got = htab->elf.sgot->size;
2879 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2880 /* Reserve room for the initial entry.
2881 FIXME: we could probably do away with it in this case. */
2882 if (htab->elf.splt->size == 0)
2883 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2884 htab->tlsdesc_plt = htab->elf.splt->size;
2885 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2889 if (htab->elf.sgotplt)
2891 /* Don't allocate .got.plt section if there are no GOT nor PLT
2892 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2893 if ((htab->elf.hgot == NULL
2894 || !htab->elf.hgot->ref_regular_nonweak)
2895 && (htab->elf.sgotplt->size
2896 == get_elf_backend_data (output_bfd)->got_header_size)
2897 && (htab->elf.splt == NULL
2898 || htab->elf.splt->size == 0)
2899 && (htab->elf.sgot == NULL
2900 || htab->elf.sgot->size == 0)
2901 && (htab->elf.iplt == NULL
2902 || htab->elf.iplt->size == 0)
2903 && (htab->elf.igotplt == NULL
2904 || htab->elf.igotplt->size == 0))
2905 htab->elf.sgotplt->size = 0;
2908 if (htab->plt_eh_frame != NULL
2909 && htab->elf.splt != NULL
2910 && htab->elf.splt->size != 0
2911 && !bfd_is_abs_section (htab->elf.splt->output_section)
2912 && _bfd_elf_eh_frame_present (info))
2914 const struct elf_x86_64_backend_data *arch_data
2915 = (const struct elf_x86_64_backend_data *) bed->arch_data;
2916 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
2919 /* We now have determined the sizes of the various dynamic sections.
2920 Allocate memory for them. */
2922 for (s = dynobj->sections; s != NULL; s = s->next)
2924 if ((s->flags & SEC_LINKER_CREATED) == 0)
2927 if (s == htab->elf.splt
2928 || s == htab->elf.sgot
2929 || s == htab->elf.sgotplt
2930 || s == htab->elf.iplt
2931 || s == htab->elf.igotplt
2932 || s == htab->plt_eh_frame
2933 || s == htab->sdynbss)
2935 /* Strip this section if we don't need it; see the
2938 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2940 if (s->size != 0 && s != htab->elf.srelplt)
2943 /* We use the reloc_count field as a counter if we need
2944 to copy relocs into the output file. */
2945 if (s != htab->elf.srelplt)
2950 /* It's not one of our sections, so don't allocate space. */
2956 /* If we don't need this section, strip it from the
2957 output file. This is mostly to handle .rela.bss and
2958 .rela.plt. We must create both sections in
2959 create_dynamic_sections, because they must be created
2960 before the linker maps input sections to output
2961 sections. The linker does that before
2962 adjust_dynamic_symbol is called, and it is that
2963 function which decides whether anything needs to go
2964 into these sections. */
2966 s->flags |= SEC_EXCLUDE;
2970 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2973 /* Allocate memory for the section contents. We use bfd_zalloc
2974 here in case unused entries are not reclaimed before the
2975 section's contents are written out. This should not happen,
2976 but this way if it does, we get a R_X86_64_NONE reloc instead
2978 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2979 if (s->contents == NULL)
2983 if (htab->plt_eh_frame != NULL
2984 && htab->plt_eh_frame->contents != NULL)
2986 const struct elf_x86_64_backend_data *arch_data
2987 = (const struct elf_x86_64_backend_data *) bed->arch_data;
2989 memcpy (htab->plt_eh_frame->contents,
2990 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
2991 bfd_put_32 (dynobj, htab->elf.splt->size,
2992 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2995 if (htab->elf.dynamic_sections_created)
2997 /* Add some entries to the .dynamic section. We fill in the
2998 values later, in elf_x86_64_finish_dynamic_sections, but we
2999 must add the entries now so that we get the correct size for
3000 the .dynamic section. The DT_DEBUG entry is filled in by the
3001 dynamic linker and used by the debugger. */
3002 #define add_dynamic_entry(TAG, VAL) \
3003 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3005 if (info->executable)
3007 if (!add_dynamic_entry (DT_DEBUG, 0))
3011 if (htab->elf.splt->size != 0)
3013 if (!add_dynamic_entry (DT_PLTGOT, 0)
3014 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3015 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3016 || !add_dynamic_entry (DT_JMPREL, 0))
3019 if (htab->tlsdesc_plt
3020 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3021 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3027 if (!add_dynamic_entry (DT_RELA, 0)
3028 || !add_dynamic_entry (DT_RELASZ, 0)
3029 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3032 /* If any dynamic relocs apply to a read-only section,
3033 then we need a DT_TEXTREL entry. */
3034 if ((info->flags & DF_TEXTREL) == 0)
3035 elf_link_hash_traverse (&htab->elf,
3036 elf_x86_64_readonly_dynrelocs,
3039 if ((info->flags & DF_TEXTREL) != 0)
3041 if (!add_dynamic_entry (DT_TEXTREL, 0))
3046 #undef add_dynamic_entry
3052 elf_x86_64_always_size_sections (bfd *output_bfd,
3053 struct bfd_link_info *info)
3055 asection *tls_sec = elf_hash_table (info)->tls_sec;
3059 struct elf_link_hash_entry *tlsbase;
3061 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3062 "_TLS_MODULE_BASE_",
3063 FALSE, FALSE, FALSE);
3065 if (tlsbase && tlsbase->type == STT_TLS)
3067 struct elf_x86_64_link_hash_table *htab;
3068 struct bfd_link_hash_entry *bh = NULL;
3069 const struct elf_backend_data *bed
3070 = get_elf_backend_data (output_bfd);
3072 htab = elf_x86_64_hash_table (info);
3076 if (!(_bfd_generic_link_add_one_symbol
3077 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3078 tls_sec, 0, NULL, FALSE,
3079 bed->collect, &bh)))
3082 htab->tls_module_base = bh;
3084 tlsbase = (struct elf_link_hash_entry *)bh;
3085 tlsbase->def_regular = 1;
3086 tlsbase->other = STV_HIDDEN;
3087 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3094 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3095 executables. Rather than setting it to the beginning of the TLS
3096 section, we have to set it to the end. This function may be called
3097 multiple times, it is idempotent. */
3100 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3102 struct elf_x86_64_link_hash_table *htab;
3103 struct bfd_link_hash_entry *base;
3105 if (!info->executable)
3108 htab = elf_x86_64_hash_table (info);
3112 base = htab->tls_module_base;
3116 base->u.def.value = htab->elf.tls_size;
3119 /* Return the base VMA address which should be subtracted from real addresses
3120 when resolving @dtpoff relocation.
3121 This is PT_TLS segment p_vaddr. */
3124 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3126 /* If tls_sec is NULL, we should have signalled an error already. */
3127 if (elf_hash_table (info)->tls_sec == NULL)
3129 return elf_hash_table (info)->tls_sec->vma;
3132 /* Return the relocation value for @tpoff relocation
3133 if STT_TLS virtual address is ADDRESS. */
3136 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3138 struct elf_link_hash_table *htab = elf_hash_table (info);
3139 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3140 bfd_vma static_tls_size;
3142 /* If tls_segment is NULL, we should have signalled an error already. */
3143 if (htab->tls_sec == NULL)
3146 /* Consider special static TLS alignment requirements. */
3147 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3148 return address - static_tls_size - htab->tls_sec->vma;
3151 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3155 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3157 /* Opcode Instruction
3160 0x0f 0x8x conditional jump */
3162 && (contents [offset - 1] == 0xe8
3163 || contents [offset - 1] == 0xe9))
3165 && contents [offset - 2] == 0x0f
3166 && (contents [offset - 1] & 0xf0) == 0x80));
3169 /* Relocate an x86_64 ELF section. */
3172 elf_x86_64_relocate_section (bfd *output_bfd,
3173 struct bfd_link_info *info,
3175 asection *input_section,
3177 Elf_Internal_Rela *relocs,
3178 Elf_Internal_Sym *local_syms,
3179 asection **local_sections)
3181 struct elf_x86_64_link_hash_table *htab;
3182 Elf_Internal_Shdr *symtab_hdr;
3183 struct elf_link_hash_entry **sym_hashes;
3184 bfd_vma *local_got_offsets;
3185 bfd_vma *local_tlsdesc_gotents;
3186 Elf_Internal_Rela *rel;
3187 Elf_Internal_Rela *relend;
3188 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3190 BFD_ASSERT (is_x86_64_elf (input_bfd));
3192 htab = elf_x86_64_hash_table (info);
3195 symtab_hdr = &elf_symtab_hdr (input_bfd);
3196 sym_hashes = elf_sym_hashes (input_bfd);
3197 local_got_offsets = elf_local_got_offsets (input_bfd);
3198 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3200 elf_x86_64_set_tls_module_base (info);
3203 relend = relocs + input_section->reloc_count;
3204 for (; rel < relend; rel++)
3206 unsigned int r_type;
3207 reloc_howto_type *howto;
3208 unsigned long r_symndx;
3209 struct elf_link_hash_entry *h;
3210 Elf_Internal_Sym *sym;
3212 bfd_vma off, offplt;
3214 bfd_boolean unresolved_reloc;
3215 bfd_reloc_status_type r;
3220 r_type = ELF32_R_TYPE (rel->r_info);
3221 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3222 || r_type == (int) R_X86_64_GNU_VTENTRY)
3225 if (r_type >= (int) R_X86_64_standard)
3227 (*_bfd_error_handler)
3228 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3229 input_bfd, input_section, r_type);
3230 bfd_set_error (bfd_error_bad_value);
3234 if (r_type != (int) R_X86_64_32
3235 || ABI_64_P (output_bfd))
3236 howto = x86_64_elf_howto_table + r_type;
3238 howto = (x86_64_elf_howto_table
3239 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3240 r_symndx = htab->r_sym (rel->r_info);
3244 unresolved_reloc = FALSE;
3245 if (r_symndx < symtab_hdr->sh_info)
3247 sym = local_syms + r_symndx;
3248 sec = local_sections[r_symndx];
3250 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3252 st_size = sym->st_size;
3254 /* Relocate against local STT_GNU_IFUNC symbol. */
3255 if (!info->relocatable
3256 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3258 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3263 /* Set STT_GNU_IFUNC symbol value. */
3264 h->root.u.def.value = sym->st_value;
3265 h->root.u.def.section = sec;
3270 bfd_boolean warned ATTRIBUTE_UNUSED;
3272 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3273 r_symndx, symtab_hdr, sym_hashes,
3275 unresolved_reloc, warned);
3279 if (sec != NULL && discarded_section (sec))
3280 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3281 rel, 1, relend, howto, 0, contents);
3283 if (info->relocatable)
3286 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3288 if (r_type == R_X86_64_64)
3290 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3291 zero-extend it to 64bit if addend is zero. */
3292 r_type = R_X86_64_32;
3293 memset (contents + rel->r_offset + 4, 0, 4);
3295 else if (r_type == R_X86_64_SIZE64)
3297 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3298 zero-extend it to 64bit if addend is zero. */
3299 r_type = R_X86_64_SIZE32;
3300 memset (contents + rel->r_offset + 4, 0, 4);
3304 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3305 it here if it is defined in a non-shared object. */
3307 && h->type == STT_GNU_IFUNC
3314 if ((input_section->flags & SEC_ALLOC) == 0
3315 || h->plt.offset == (bfd_vma) -1)
3318 /* STT_GNU_IFUNC symbol must go through PLT. */
3319 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3320 relocation = (plt->output_section->vma
3321 + plt->output_offset + h->plt.offset);
3326 if (h->root.root.string)
3327 name = h->root.root.string;
3329 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3331 (*_bfd_error_handler)
3332 (_("%B: relocation %s against STT_GNU_IFUNC "
3333 "symbol `%s' isn't handled by %s"), input_bfd,
3334 x86_64_elf_howto_table[r_type].name,
3335 name, __FUNCTION__);
3336 bfd_set_error (bfd_error_bad_value);
3345 if (ABI_64_P (output_bfd))
3349 if (rel->r_addend != 0)
3351 if (h->root.root.string)
3352 name = h->root.root.string;
3354 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3356 (*_bfd_error_handler)
3357 (_("%B: relocation %s against STT_GNU_IFUNC "
3358 "symbol `%s' has non-zero addend: %d"),
3359 input_bfd, x86_64_elf_howto_table[r_type].name,
3360 name, rel->r_addend);
3361 bfd_set_error (bfd_error_bad_value);
3365 /* Generate dynamic relcoation only when there is a
3366 non-GOT reference in a shared object. */
3367 if (info->shared && h->non_got_ref)
3369 Elf_Internal_Rela outrel;
3372 /* Need a dynamic relocation to get the real function
3374 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3378 if (outrel.r_offset == (bfd_vma) -1
3379 || outrel.r_offset == (bfd_vma) -2)
3382 outrel.r_offset += (input_section->output_section->vma
3383 + input_section->output_offset);
3385 if (h->dynindx == -1
3387 || info->executable)
3389 /* This symbol is resolved locally. */
3390 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3391 outrel.r_addend = (h->root.u.def.value
3392 + h->root.u.def.section->output_section->vma
3393 + h->root.u.def.section->output_offset);
3397 outrel.r_info = htab->r_info (h->dynindx, r_type);
3398 outrel.r_addend = 0;
3401 sreloc = htab->elf.irelifunc;
3402 elf_append_rela (output_bfd, sreloc, &outrel);
3404 /* If this reloc is against an external symbol, we
3405 do not want to fiddle with the addend. Otherwise,
3406 we need to include the symbol value so that it
3407 becomes an addend for the dynamic reloc. For an
3408 internal symbol, we have updated addend. */
3414 case R_X86_64_PLT32:
3417 case R_X86_64_GOTPCREL:
3418 case R_X86_64_GOTPCREL64:
3419 base_got = htab->elf.sgot;
3420 off = h->got.offset;
3422 if (base_got == NULL)
3425 if (off == (bfd_vma) -1)
3427 /* We can't use h->got.offset here to save state, or
3428 even just remember the offset, as finish_dynamic_symbol
3429 would use that as offset into .got. */
3431 if (htab->elf.splt != NULL)
3433 plt_index = h->plt.offset / plt_entry_size - 1;
3434 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3435 base_got = htab->elf.sgotplt;
3439 plt_index = h->plt.offset / plt_entry_size;
3440 off = plt_index * GOT_ENTRY_SIZE;
3441 base_got = htab->elf.igotplt;
3444 if (h->dynindx == -1
3448 /* This references the local defitionion. We must
3449 initialize this entry in the global offset table.
3450 Since the offset must always be a multiple of 8,
3451 we use the least significant bit to record
3452 whether we have initialized it already.
3454 When doing a dynamic link, we create a .rela.got
3455 relocation entry to initialize the value. This
3456 is done in the finish_dynamic_symbol routine. */
3461 bfd_put_64 (output_bfd, relocation,
3462 base_got->contents + off);
3463 /* Note that this is harmless for the GOTPLT64
3464 case, as -1 | 1 still is -1. */
3470 relocation = (base_got->output_section->vma
3471 + base_got->output_offset + off);
3477 /* When generating a shared object, the relocations handled here are
3478 copied into the output file to be resolved at run time. */
3481 case R_X86_64_GOT32:
3482 case R_X86_64_GOT64:
3483 /* Relocation is to the entry for this symbol in the global
3485 case R_X86_64_GOTPCREL:
3486 case R_X86_64_GOTPCREL64:
3487 /* Use global offset table entry as symbol value. */
3488 case R_X86_64_GOTPLT64:
3489 /* This is the same as GOT64 for relocation purposes, but
3490 indicates the existence of a PLT entry. The difficulty is,
3491 that we must calculate the GOT slot offset from the PLT
3492 offset, if this symbol got a PLT entry (it was global).
3493 Additionally if it's computed from the PLT entry, then that
3494 GOT offset is relative to .got.plt, not to .got. */
3495 base_got = htab->elf.sgot;
3497 if (htab->elf.sgot == NULL)
3504 off = h->got.offset;
3506 && h->plt.offset != (bfd_vma)-1
3507 && off == (bfd_vma)-1)
3509 /* We can't use h->got.offset here to save
3510 state, or even just remember the offset, as
3511 finish_dynamic_symbol would use that as offset into
3513 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3514 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3515 base_got = htab->elf.sgotplt;
3518 dyn = htab->elf.dynamic_sections_created;
3520 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3522 && SYMBOL_REFERENCES_LOCAL (info, h))
3523 || (ELF_ST_VISIBILITY (h->other)
3524 && h->root.type == bfd_link_hash_undefweak))
3526 /* This is actually a static link, or it is a -Bsymbolic
3527 link and the symbol is defined locally, or the symbol
3528 was forced to be local because of a version file. We
3529 must initialize this entry in the global offset table.
3530 Since the offset must always be a multiple of 8, we
3531 use the least significant bit to record whether we
3532 have initialized it already.
3534 When doing a dynamic link, we create a .rela.got
3535 relocation entry to initialize the value. This is
3536 done in the finish_dynamic_symbol routine. */
3541 bfd_put_64 (output_bfd, relocation,
3542 base_got->contents + off);
3543 /* Note that this is harmless for the GOTPLT64 case,
3544 as -1 | 1 still is -1. */
3549 unresolved_reloc = FALSE;
3553 if (local_got_offsets == NULL)
3556 off = local_got_offsets[r_symndx];
3558 /* The offset must always be a multiple of 8. We use
3559 the least significant bit to record whether we have
3560 already generated the necessary reloc. */
3565 bfd_put_64 (output_bfd, relocation,
3566 base_got->contents + off);
3571 Elf_Internal_Rela outrel;
3573 /* We need to generate a R_X86_64_RELATIVE reloc
3574 for the dynamic linker. */
3575 s = htab->elf.srelgot;
3579 outrel.r_offset = (base_got->output_section->vma
3580 + base_got->output_offset
3582 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3583 outrel.r_addend = relocation;
3584 elf_append_rela (output_bfd, s, &outrel);
3587 local_got_offsets[r_symndx] |= 1;
3591 if (off >= (bfd_vma) -2)
3594 relocation = base_got->output_section->vma
3595 + base_got->output_offset + off;
3596 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3597 relocation -= htab->elf.sgotplt->output_section->vma
3598 - htab->elf.sgotplt->output_offset;
3602 case R_X86_64_GOTOFF64:
3603 /* Relocation is relative to the start of the global offset
3606 /* Check to make sure it isn't a protected function symbol
3607 for shared library since it may not be local when used
3608 as function address. */
3609 if (!info->executable
3611 && !SYMBOLIC_BIND (info, h)
3613 && h->type == STT_FUNC
3614 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3616 (*_bfd_error_handler)
3617 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3618 input_bfd, h->root.root.string);
3619 bfd_set_error (bfd_error_bad_value);
3623 /* Note that sgot is not involved in this
3624 calculation. We always want the start of .got.plt. If we
3625 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3626 permitted by the ABI, we might have to change this
3628 relocation -= htab->elf.sgotplt->output_section->vma
3629 + htab->elf.sgotplt->output_offset;
3632 case R_X86_64_GOTPC32:
3633 case R_X86_64_GOTPC64:
3634 /* Use global offset table as symbol value. */
3635 relocation = htab->elf.sgotplt->output_section->vma
3636 + htab->elf.sgotplt->output_offset;
3637 unresolved_reloc = FALSE;
3640 case R_X86_64_PLTOFF64:
3641 /* Relocation is PLT entry relative to GOT. For local
3642 symbols it's the symbol itself relative to GOT. */
3644 /* See PLT32 handling. */
3645 && h->plt.offset != (bfd_vma) -1
3646 && htab->elf.splt != NULL)
3648 relocation = (htab->elf.splt->output_section->vma
3649 + htab->elf.splt->output_offset
3651 unresolved_reloc = FALSE;
3654 relocation -= htab->elf.sgotplt->output_section->vma
3655 + htab->elf.sgotplt->output_offset;
3658 case R_X86_64_PLT32:
3659 /* Relocation is to the entry for this symbol in the
3660 procedure linkage table. */
3662 /* Resolve a PLT32 reloc against a local symbol directly,
3663 without using the procedure linkage table. */
3667 if (h->plt.offset == (bfd_vma) -1
3668 || htab->elf.splt == NULL)
3670 /* We didn't make a PLT entry for this symbol. This
3671 happens when statically linking PIC code, or when
3672 using -Bsymbolic. */
3676 relocation = (htab->elf.splt->output_section->vma
3677 + htab->elf.splt->output_offset
3679 unresolved_reloc = FALSE;
3682 case R_X86_64_SIZE32:
3683 case R_X86_64_SIZE64:
3684 /* Set to symbol size. */
3685 relocation = st_size;
3692 && (input_section->flags & SEC_ALLOC) != 0
3693 && (input_section->flags & SEC_READONLY) != 0
3696 bfd_boolean fail = FALSE;
3698 = (r_type == R_X86_64_PC32
3699 && is_32bit_relative_branch (contents, rel->r_offset));
3701 if (SYMBOL_REFERENCES_LOCAL (info, h))
3703 /* Symbol is referenced locally. Make sure it is
3704 defined locally or for a branch. */
3705 fail = !h->def_regular && !branch;
3709 /* Symbol isn't referenced locally. We only allow
3710 branch to symbol with non-default visibility. */
3712 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3719 const char *pic = "";
3721 switch (ELF_ST_VISIBILITY (h->other))
3724 v = _("hidden symbol");
3727 v = _("internal symbol");
3730 v = _("protected symbol");
3734 pic = _("; recompile with -fPIC");
3739 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3741 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3743 (*_bfd_error_handler) (fmt, input_bfd,
3744 x86_64_elf_howto_table[r_type].name,
3745 v, h->root.root.string, pic);
3746 bfd_set_error (bfd_error_bad_value);
3757 /* FIXME: The ABI says the linker should make sure the value is
3758 the same when it's zeroextended to 64 bit. */
3761 if ((input_section->flags & SEC_ALLOC) == 0)
3766 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3767 || h->root.type != bfd_link_hash_undefweak)
3768 && ((! IS_X86_64_PCREL_TYPE (r_type)
3769 && r_type != R_X86_64_SIZE32
3770 && r_type != R_X86_64_SIZE64)
3771 || ! SYMBOL_CALLS_LOCAL (info, h)))
3772 || (ELIMINATE_COPY_RELOCS
3779 || h->root.type == bfd_link_hash_undefweak
3780 || h->root.type == bfd_link_hash_undefined)))
3782 Elf_Internal_Rela outrel;
3783 bfd_boolean skip, relocate;
3786 /* When generating a shared object, these relocations
3787 are copied into the output file to be resolved at run
3793 _bfd_elf_section_offset (output_bfd, info, input_section,
3795 if (outrel.r_offset == (bfd_vma) -1)
3797 else if (outrel.r_offset == (bfd_vma) -2)
3798 skip = TRUE, relocate = TRUE;
3800 outrel.r_offset += (input_section->output_section->vma
3801 + input_section->output_offset);
3804 memset (&outrel, 0, sizeof outrel);
3806 /* h->dynindx may be -1 if this symbol was marked to
3810 && (IS_X86_64_PCREL_TYPE (r_type)
3812 || ! SYMBOLIC_BIND (info, h)
3813 || ! h->def_regular))
3815 outrel.r_info = htab->r_info (h->dynindx, r_type);
3816 outrel.r_addend = rel->r_addend;
3820 /* This symbol is local, or marked to become local. */
3821 if (r_type == htab->pointer_r_type)
3824 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3825 outrel.r_addend = relocation + rel->r_addend;
3827 else if (r_type == R_X86_64_64
3828 && !ABI_64_P (output_bfd))
3831 outrel.r_info = htab->r_info (0,
3832 R_X86_64_RELATIVE64);
3833 outrel.r_addend = relocation + rel->r_addend;
3834 /* Check addend overflow. */
3835 if ((outrel.r_addend & 0x80000000)
3836 != (rel->r_addend & 0x80000000))
3839 int addend = rel->r_addend;
3840 if (h && h->root.root.string)
3841 name = h->root.root.string;
3843 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3846 (*_bfd_error_handler)
3847 (_("%B: addend -0x%x in relocation %s against "
3848 "symbol `%s' at 0x%lx in section `%A' is "
3850 input_bfd, input_section, addend,
3851 x86_64_elf_howto_table[r_type].name,
3852 name, (unsigned long) rel->r_offset);
3854 (*_bfd_error_handler)
3855 (_("%B: addend 0x%x in relocation %s against "
3856 "symbol `%s' at 0x%lx in section `%A' is "
3858 input_bfd, input_section, addend,
3859 x86_64_elf_howto_table[r_type].name,
3860 name, (unsigned long) rel->r_offset);
3861 bfd_set_error (bfd_error_bad_value);
3869 if (bfd_is_abs_section (sec))
3871 else if (sec == NULL || sec->owner == NULL)
3873 bfd_set_error (bfd_error_bad_value);
3880 /* We are turning this relocation into one
3881 against a section symbol. It would be
3882 proper to subtract the symbol's value,
3883 osec->vma, from the emitted reloc addend,
3884 but ld.so expects buggy relocs. */
3885 osec = sec->output_section;
3886 sindx = elf_section_data (osec)->dynindx;
3889 asection *oi = htab->elf.text_index_section;
3890 sindx = elf_section_data (oi)->dynindx;
3892 BFD_ASSERT (sindx != 0);
3895 outrel.r_info = htab->r_info (sindx, r_type);
3896 outrel.r_addend = relocation + rel->r_addend;
3900 sreloc = elf_section_data (input_section)->sreloc;
3902 if (sreloc == NULL || sreloc->contents == NULL)
3904 r = bfd_reloc_notsupported;
3905 goto check_relocation_error;
3908 elf_append_rela (output_bfd, sreloc, &outrel);
3910 /* If this reloc is against an external symbol, we do
3911 not want to fiddle with the addend. Otherwise, we
3912 need to include the symbol value so that it becomes
3913 an addend for the dynamic reloc. */
3920 case R_X86_64_TLSGD:
3921 case R_X86_64_GOTPC32_TLSDESC:
3922 case R_X86_64_TLSDESC_CALL:
3923 case R_X86_64_GOTTPOFF:
3924 tls_type = GOT_UNKNOWN;
3925 if (h == NULL && local_got_offsets)
3926 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3928 tls_type = elf_x86_64_hash_entry (h)->tls_type;
3930 if (! elf_x86_64_tls_transition (info, input_bfd,
3931 input_section, contents,
3932 symtab_hdr, sym_hashes,
3933 &r_type, tls_type, rel,
3934 relend, h, r_symndx))
3937 if (r_type == R_X86_64_TPOFF32)
3939 bfd_vma roff = rel->r_offset;
3941 BFD_ASSERT (! unresolved_reloc);
3943 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3945 /* GD->LE transition. For 64bit, change
3946 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3947 .word 0x6666; rex64; call __tls_get_addr
3950 leaq foo@tpoff(%rax), %rax
3952 leaq foo@tlsgd(%rip), %rdi
3953 .word 0x6666; rex64; call __tls_get_addr
3956 leaq foo@tpoff(%rax), %rax */
3957 if (ABI_64_P (output_bfd))
3958 memcpy (contents + roff - 4,
3959 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3962 memcpy (contents + roff - 3,
3963 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3965 bfd_put_32 (output_bfd,
3966 elf_x86_64_tpoff (info, relocation),
3967 contents + roff + 8);
3968 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3972 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3974 /* GDesc -> LE transition.
3975 It's originally something like:
3976 leaq x@tlsdesc(%rip), %rax
3979 movl $x@tpoff, %rax. */
3981 unsigned int val, type;
3983 type = bfd_get_8 (input_bfd, contents + roff - 3);
3984 val = bfd_get_8 (input_bfd, contents + roff - 1);
3985 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3986 contents + roff - 3);
3987 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3988 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3989 contents + roff - 1);
3990 bfd_put_32 (output_bfd,
3991 elf_x86_64_tpoff (info, relocation),
3995 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3997 /* GDesc -> LE transition.
4002 bfd_put_8 (output_bfd, 0x66, contents + roff);
4003 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4006 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4008 /* IE->LE transition:
4009 Originally it can be one of:
4010 movq foo@gottpoff(%rip), %reg
4011 addq foo@gottpoff(%rip), %reg
4014 leaq foo(%reg), %reg
4017 unsigned int val, type, reg;
4019 val = bfd_get_8 (input_bfd, contents + roff - 3);
4020 type = bfd_get_8 (input_bfd, contents + roff - 2);
4021 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4027 bfd_put_8 (output_bfd, 0x49,
4028 contents + roff - 3);
4029 else if (!ABI_64_P (output_bfd) && val == 0x44)
4030 bfd_put_8 (output_bfd, 0x41,
4031 contents + roff - 3);
4032 bfd_put_8 (output_bfd, 0xc7,
4033 contents + roff - 2);
4034 bfd_put_8 (output_bfd, 0xc0 | reg,
4035 contents + roff - 1);
4039 /* addq -> addq - addressing with %rsp/%r12 is
4042 bfd_put_8 (output_bfd, 0x49,
4043 contents + roff - 3);
4044 else if (!ABI_64_P (output_bfd) && val == 0x44)
4045 bfd_put_8 (output_bfd, 0x41,
4046 contents + roff - 3);
4047 bfd_put_8 (output_bfd, 0x81,
4048 contents + roff - 2);
4049 bfd_put_8 (output_bfd, 0xc0 | reg,
4050 contents + roff - 1);
4056 bfd_put_8 (output_bfd, 0x4d,
4057 contents + roff - 3);
4058 else if (!ABI_64_P (output_bfd) && val == 0x44)
4059 bfd_put_8 (output_bfd, 0x45,
4060 contents + roff - 3);
4061 bfd_put_8 (output_bfd, 0x8d,
4062 contents + roff - 2);
4063 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4064 contents + roff - 1);
4066 bfd_put_32 (output_bfd,
4067 elf_x86_64_tpoff (info, relocation),
4075 if (htab->elf.sgot == NULL)
4080 off = h->got.offset;
4081 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4085 if (local_got_offsets == NULL)
4088 off = local_got_offsets[r_symndx];
4089 offplt = local_tlsdesc_gotents[r_symndx];
4096 Elf_Internal_Rela outrel;
4100 if (htab->elf.srelgot == NULL)
4103 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4105 if (GOT_TLS_GDESC_P (tls_type))
4107 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4108 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4109 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4110 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4111 + htab->elf.sgotplt->output_offset
4113 + htab->sgotplt_jump_table_size);
4114 sreloc = htab->elf.srelplt;
4116 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4118 outrel.r_addend = 0;
4119 elf_append_rela (output_bfd, sreloc, &outrel);
4122 sreloc = htab->elf.srelgot;
4124 outrel.r_offset = (htab->elf.sgot->output_section->vma
4125 + htab->elf.sgot->output_offset + off);
4127 if (GOT_TLS_GD_P (tls_type))
4128 dr_type = R_X86_64_DTPMOD64;
4129 else if (GOT_TLS_GDESC_P (tls_type))
4132 dr_type = R_X86_64_TPOFF64;
4134 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4135 outrel.r_addend = 0;
4136 if ((dr_type == R_X86_64_TPOFF64
4137 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4138 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4139 outrel.r_info = htab->r_info (indx, dr_type);
4141 elf_append_rela (output_bfd, sreloc, &outrel);
4143 if (GOT_TLS_GD_P (tls_type))
4147 BFD_ASSERT (! unresolved_reloc);
4148 bfd_put_64 (output_bfd,
4149 relocation - elf_x86_64_dtpoff_base (info),
4150 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4154 bfd_put_64 (output_bfd, 0,
4155 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4156 outrel.r_info = htab->r_info (indx,
4158 outrel.r_offset += GOT_ENTRY_SIZE;
4159 elf_append_rela (output_bfd, sreloc,
4168 local_got_offsets[r_symndx] |= 1;
4171 if (off >= (bfd_vma) -2
4172 && ! GOT_TLS_GDESC_P (tls_type))
4174 if (r_type == ELF32_R_TYPE (rel->r_info))
4176 if (r_type == R_X86_64_GOTPC32_TLSDESC
4177 || r_type == R_X86_64_TLSDESC_CALL)
4178 relocation = htab->elf.sgotplt->output_section->vma
4179 + htab->elf.sgotplt->output_offset
4180 + offplt + htab->sgotplt_jump_table_size;
4182 relocation = htab->elf.sgot->output_section->vma
4183 + htab->elf.sgot->output_offset + off;
4184 unresolved_reloc = FALSE;
4188 bfd_vma roff = rel->r_offset;
4190 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4192 /* GD->IE transition. For 64bit, change
4193 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4194 .word 0x6666; rex64; call __tls_get_addr@plt
4197 addq foo@gottpoff(%rip), %rax
4199 leaq foo@tlsgd(%rip), %rdi
4200 .word 0x6666; rex64; call __tls_get_addr@plt
4203 addq foo@gottpoff(%rip), %rax */
4204 if (ABI_64_P (output_bfd))
4205 memcpy (contents + roff - 4,
4206 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4209 memcpy (contents + roff - 3,
4210 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4213 relocation = (htab->elf.sgot->output_section->vma
4214 + htab->elf.sgot->output_offset + off
4216 - input_section->output_section->vma
4217 - input_section->output_offset
4219 bfd_put_32 (output_bfd, relocation,
4220 contents + roff + 8);
4221 /* Skip R_X86_64_PLT32. */
4225 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4227 /* GDesc -> IE transition.
4228 It's originally something like:
4229 leaq x@tlsdesc(%rip), %rax
4232 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4234 /* Now modify the instruction as appropriate. To
4235 turn a leaq into a movq in the form we use it, it
4236 suffices to change the second byte from 0x8d to
4238 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4240 bfd_put_32 (output_bfd,
4241 htab->elf.sgot->output_section->vma
4242 + htab->elf.sgot->output_offset + off
4244 - input_section->output_section->vma
4245 - input_section->output_offset
4250 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4252 /* GDesc -> IE transition.
4259 bfd_put_8 (output_bfd, 0x66, contents + roff);
4260 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4268 case R_X86_64_TLSLD:
4269 if (! elf_x86_64_tls_transition (info, input_bfd,
4270 input_section, contents,
4271 symtab_hdr, sym_hashes,
4272 &r_type, GOT_UNKNOWN,
4273 rel, relend, h, r_symndx))
4276 if (r_type != R_X86_64_TLSLD)
4278 /* LD->LE transition:
4279 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4280 For 64bit, we change it into:
4281 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4282 For 32bit, we change it into:
4283 nopl 0x0(%rax); movl %fs:0, %eax. */
4285 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4286 if (ABI_64_P (output_bfd))
4287 memcpy (contents + rel->r_offset - 3,
4288 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4290 memcpy (contents + rel->r_offset - 3,
4291 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4292 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
4297 if (htab->elf.sgot == NULL)
4300 off = htab->tls_ld_got.offset;
4305 Elf_Internal_Rela outrel;
4307 if (htab->elf.srelgot == NULL)
4310 outrel.r_offset = (htab->elf.sgot->output_section->vma
4311 + htab->elf.sgot->output_offset + off);
4313 bfd_put_64 (output_bfd, 0,
4314 htab->elf.sgot->contents + off);
4315 bfd_put_64 (output_bfd, 0,
4316 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4317 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4318 outrel.r_addend = 0;
4319 elf_append_rela (output_bfd, htab->elf.srelgot,
4321 htab->tls_ld_got.offset |= 1;
4323 relocation = htab->elf.sgot->output_section->vma
4324 + htab->elf.sgot->output_offset + off;
4325 unresolved_reloc = FALSE;
4328 case R_X86_64_DTPOFF32:
4329 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4330 relocation -= elf_x86_64_dtpoff_base (info);
4332 relocation = elf_x86_64_tpoff (info, relocation);
4335 case R_X86_64_TPOFF32:
4336 case R_X86_64_TPOFF64:
4337 BFD_ASSERT (info->executable);
4338 relocation = elf_x86_64_tpoff (info, relocation);
4345 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4346 because such sections are not SEC_ALLOC and thus ld.so will
4347 not process them. */
4348 if (unresolved_reloc
4349 && !((input_section->flags & SEC_DEBUGGING) != 0
4351 && _bfd_elf_section_offset (output_bfd, info, input_section,
4352 rel->r_offset) != (bfd_vma) -1)
4354 (*_bfd_error_handler)
4355 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4358 (long) rel->r_offset,
4360 h->root.root.string);
4365 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4366 contents, rel->r_offset,
4367 relocation, rel->r_addend);
4369 check_relocation_error:
4370 if (r != bfd_reloc_ok)
4375 name = h->root.root.string;
4378 name = bfd_elf_string_from_elf_section (input_bfd,
4379 symtab_hdr->sh_link,
4384 name = bfd_section_name (input_bfd, sec);
4387 if (r == bfd_reloc_overflow)
4389 if (! ((*info->callbacks->reloc_overflow)
4390 (info, (h ? &h->root : NULL), name, howto->name,
4391 (bfd_vma) 0, input_bfd, input_section,
4397 (*_bfd_error_handler)
4398 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4399 input_bfd, input_section,
4400 (long) rel->r_offset, name, (int) r);
4409 /* Finish up dynamic symbol handling. We set the contents of various
4410 dynamic sections here. */
4413 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4414 struct bfd_link_info *info,
4415 struct elf_link_hash_entry *h,
4416 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4418 struct elf_x86_64_link_hash_table *htab;
4419 const struct elf_x86_64_backend_data *const abed
4420 = get_elf_x86_64_backend_data (output_bfd);
4422 htab = elf_x86_64_hash_table (info);
4426 if (h->plt.offset != (bfd_vma) -1)
4430 Elf_Internal_Rela rela;
4432 asection *plt, *gotplt, *relplt;
4433 const struct elf_backend_data *bed;
4435 /* When building a static executable, use .iplt, .igot.plt and
4436 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4437 if (htab->elf.splt != NULL)
4439 plt = htab->elf.splt;
4440 gotplt = htab->elf.sgotplt;
4441 relplt = htab->elf.srelplt;
4445 plt = htab->elf.iplt;
4446 gotplt = htab->elf.igotplt;
4447 relplt = htab->elf.irelplt;
4450 /* This symbol has an entry in the procedure linkage table. Set
4452 if ((h->dynindx == -1
4453 && !((h->forced_local || info->executable)
4455 && h->type == STT_GNU_IFUNC))
4461 /* Get the index in the procedure linkage table which
4462 corresponds to this symbol. This is the index of this symbol
4463 in all the symbols for which we are making plt entries. The
4464 first entry in the procedure linkage table is reserved.
4466 Get the offset into the .got table of the entry that
4467 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4468 bytes. The first three are reserved for the dynamic linker.
4470 For static executables, we don't reserve anything. */
4472 if (plt == htab->elf.splt)
4474 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4475 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4479 got_offset = h->plt.offset / abed->plt_entry_size;
4480 got_offset = got_offset * GOT_ENTRY_SIZE;
4483 /* Fill in the entry in the procedure linkage table. */
4484 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4485 abed->plt_entry_size);
4487 /* Insert the relocation positions of the plt section. */
4489 /* Put offset the PC-relative instruction referring to the GOT entry,
4490 subtracting the size of that instruction. */
4491 bfd_put_32 (output_bfd,
4492 (gotplt->output_section->vma
4493 + gotplt->output_offset
4495 - plt->output_section->vma
4496 - plt->output_offset
4498 - abed->plt_got_insn_size),
4499 plt->contents + h->plt.offset + abed->plt_got_offset);
4501 /* Fill in the entry in the global offset table, initially this
4502 points to the second part of the PLT entry. */
4503 bfd_put_64 (output_bfd, (plt->output_section->vma
4504 + plt->output_offset
4505 + h->plt.offset + abed->plt_lazy_offset),
4506 gotplt->contents + got_offset);
4508 /* Fill in the entry in the .rela.plt section. */
4509 rela.r_offset = (gotplt->output_section->vma
4510 + gotplt->output_offset
4512 if (h->dynindx == -1
4513 || ((info->executable
4514 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4516 && h->type == STT_GNU_IFUNC))
4518 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4519 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4520 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4521 rela.r_addend = (h->root.u.def.value
4522 + h->root.u.def.section->output_section->vma
4523 + h->root.u.def.section->output_offset);
4524 /* R_X86_64_IRELATIVE comes last. */
4525 plt_index = htab->next_irelative_index--;
4529 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
4531 plt_index = htab->next_jump_slot_index++;
4534 /* Don't fill PLT entry for static executables. */
4535 if (plt == htab->elf.splt)
4537 /* Put relocation index. */
4538 bfd_put_32 (output_bfd, plt_index,
4539 plt->contents + h->plt.offset + abed->plt_reloc_offset);
4540 /* Put offset for jmp .PLT0. */
4541 bfd_put_32 (output_bfd, - (h->plt.offset + abed->plt_plt_insn_end),
4542 plt->contents + h->plt.offset + abed->plt_plt_offset);
4545 bed = get_elf_backend_data (output_bfd);
4546 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
4547 bed->s->swap_reloca_out (output_bfd, &rela, loc);
4549 if (!h->def_regular)
4551 /* Mark the symbol as undefined, rather than as defined in
4552 the .plt section. Leave the value if there were any
4553 relocations where pointer equality matters (this is a clue
4554 for the dynamic linker, to make function pointer
4555 comparisons work between an application and shared
4556 library), otherwise set it to zero. If a function is only
4557 called from a binary, there is no need to slow down
4558 shared libraries because of that. */
4559 sym->st_shndx = SHN_UNDEF;
4560 if (!h->pointer_equality_needed)
4565 if (h->got.offset != (bfd_vma) -1
4566 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
4567 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
4569 Elf_Internal_Rela rela;
4571 /* This symbol has an entry in the global offset table. Set it
4573 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4576 rela.r_offset = (htab->elf.sgot->output_section->vma
4577 + htab->elf.sgot->output_offset
4578 + (h->got.offset &~ (bfd_vma) 1));
4580 /* If this is a static link, or it is a -Bsymbolic link and the
4581 symbol is defined locally or was forced to be local because
4582 of a version file, we just want to emit a RELATIVE reloc.
4583 The entry in the global offset table will already have been
4584 initialized in the relocate_section function. */
4586 && h->type == STT_GNU_IFUNC)
4590 /* Generate R_X86_64_GLOB_DAT. */
4597 if (!h->pointer_equality_needed)
4600 /* For non-shared object, we can't use .got.plt, which
4601 contains the real function addres if we need pointer
4602 equality. We load the GOT entry with the PLT entry. */
4603 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4604 bfd_put_64 (output_bfd, (plt->output_section->vma
4605 + plt->output_offset
4607 htab->elf.sgot->contents + h->got.offset);
4611 else if (info->shared
4612 && SYMBOL_REFERENCES_LOCAL (info, h))
4614 if (!h->def_regular)
4616 BFD_ASSERT((h->got.offset & 1) != 0);
4617 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4618 rela.r_addend = (h->root.u.def.value
4619 + h->root.u.def.section->output_section->vma
4620 + h->root.u.def.section->output_offset);
4624 BFD_ASSERT((h->got.offset & 1) == 0);
4626 bfd_put_64 (output_bfd, (bfd_vma) 0,
4627 htab->elf.sgot->contents + h->got.offset);
4628 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4632 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
4637 Elf_Internal_Rela rela;
4639 /* This symbol needs a copy reloc. Set it up. */
4641 if (h->dynindx == -1
4642 || (h->root.type != bfd_link_hash_defined
4643 && h->root.type != bfd_link_hash_defweak)
4644 || htab->srelbss == NULL)
4647 rela.r_offset = (h->root.u.def.value
4648 + h->root.u.def.section->output_section->vma
4649 + h->root.u.def.section->output_offset);
4650 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4652 elf_append_rela (output_bfd, htab->srelbss, &rela);
4658 /* Finish up local dynamic symbol handling. We set the contents of
4659 various dynamic sections here. */
4662 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4664 struct elf_link_hash_entry *h
4665 = (struct elf_link_hash_entry *) *slot;
4666 struct bfd_link_info *info
4667 = (struct bfd_link_info *) inf;
4669 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4673 /* Used to decide how to sort relocs in an optimal manner for the
4674 dynamic linker, before writing them out. */
4676 static enum elf_reloc_type_class
4677 elf_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
4679 switch ((int) ELF32_R_TYPE (rela->r_info))
4681 case R_X86_64_RELATIVE:
4682 case R_X86_64_RELATIVE64:
4683 return reloc_class_relative;
4684 case R_X86_64_JUMP_SLOT:
4685 return reloc_class_plt;
4687 return reloc_class_copy;
4689 return reloc_class_normal;
4693 /* Finish up the dynamic sections. */
4696 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4697 struct bfd_link_info *info)
4699 struct elf_x86_64_link_hash_table *htab;
4702 const struct elf_x86_64_backend_data *const abed
4703 = get_elf_x86_64_backend_data (output_bfd);
4705 htab = elf_x86_64_hash_table (info);
4709 dynobj = htab->elf.dynobj;
4710 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4712 if (htab->elf.dynamic_sections_created)
4714 bfd_byte *dyncon, *dynconend;
4715 const struct elf_backend_data *bed;
4716 bfd_size_type sizeof_dyn;
4718 if (sdyn == NULL || htab->elf.sgot == NULL)
4721 bed = get_elf_backend_data (dynobj);
4722 sizeof_dyn = bed->s->sizeof_dyn;
4723 dyncon = sdyn->contents;
4724 dynconend = sdyn->contents + sdyn->size;
4725 for (; dyncon < dynconend; dyncon += sizeof_dyn)
4727 Elf_Internal_Dyn dyn;
4730 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
4738 s = htab->elf.sgotplt;
4739 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4743 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4747 s = htab->elf.srelplt->output_section;
4748 dyn.d_un.d_val = s->size;
4752 /* The procedure linkage table relocs (DT_JMPREL) should
4753 not be included in the overall relocs (DT_RELA).
4754 Therefore, we override the DT_RELASZ entry here to
4755 make it not include the JMPREL relocs. Since the
4756 linker script arranges for .rela.plt to follow all
4757 other relocation sections, we don't have to worry
4758 about changing the DT_RELA entry. */
4759 if (htab->elf.srelplt != NULL)
4761 s = htab->elf.srelplt->output_section;
4762 dyn.d_un.d_val -= s->size;
4766 case DT_TLSDESC_PLT:
4768 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4769 + htab->tlsdesc_plt;
4772 case DT_TLSDESC_GOT:
4774 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4775 + htab->tlsdesc_got;
4779 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
4782 /* Fill in the special first entry in the procedure linkage table. */
4783 if (htab->elf.splt && htab->elf.splt->size > 0)
4785 /* Fill in the first entry in the procedure linkage table. */
4786 memcpy (htab->elf.splt->contents,
4787 abed->plt0_entry, abed->plt_entry_size);
4788 /* Add offset for pushq GOT+8(%rip), since the instruction
4789 uses 6 bytes subtract this value. */
4790 bfd_put_32 (output_bfd,
4791 (htab->elf.sgotplt->output_section->vma
4792 + htab->elf.sgotplt->output_offset
4794 - htab->elf.splt->output_section->vma
4795 - htab->elf.splt->output_offset
4797 htab->elf.splt->contents + abed->plt0_got1_offset);
4798 /* Add offset for the PC-relative instruction accessing GOT+16,
4799 subtracting the offset to the end of that instruction. */
4800 bfd_put_32 (output_bfd,
4801 (htab->elf.sgotplt->output_section->vma
4802 + htab->elf.sgotplt->output_offset
4804 - htab->elf.splt->output_section->vma
4805 - htab->elf.splt->output_offset
4806 - abed->plt0_got2_insn_end),
4807 htab->elf.splt->contents + abed->plt0_got2_offset);
4809 elf_section_data (htab->elf.splt->output_section)
4810 ->this_hdr.sh_entsize = abed->plt_entry_size;
4812 if (htab->tlsdesc_plt)
4814 bfd_put_64 (output_bfd, (bfd_vma) 0,
4815 htab->elf.sgot->contents + htab->tlsdesc_got);
4817 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4818 abed->plt0_entry, abed->plt_entry_size);
4820 /* Add offset for pushq GOT+8(%rip), since the
4821 instruction uses 6 bytes subtract this value. */
4822 bfd_put_32 (output_bfd,
4823 (htab->elf.sgotplt->output_section->vma
4824 + htab->elf.sgotplt->output_offset
4826 - htab->elf.splt->output_section->vma
4827 - htab->elf.splt->output_offset
4830 htab->elf.splt->contents
4831 + htab->tlsdesc_plt + abed->plt0_got1_offset);
4832 /* Add offset for the PC-relative instruction accessing GOT+TDG,
4833 where TGD stands for htab->tlsdesc_got, subtracting the offset
4834 to the end of that instruction. */
4835 bfd_put_32 (output_bfd,
4836 (htab->elf.sgot->output_section->vma
4837 + htab->elf.sgot->output_offset
4839 - htab->elf.splt->output_section->vma
4840 - htab->elf.splt->output_offset
4842 - abed->plt0_got2_insn_end),
4843 htab->elf.splt->contents
4844 + htab->tlsdesc_plt + abed->plt0_got2_offset);
4849 if (htab->elf.sgotplt)
4851 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4853 (*_bfd_error_handler)
4854 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4858 /* Fill in the first three entries in the global offset table. */
4859 if (htab->elf.sgotplt->size > 0)
4861 /* Set the first entry in the global offset table to the address of
4862 the dynamic section. */
4864 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4866 bfd_put_64 (output_bfd,
4867 sdyn->output_section->vma + sdyn->output_offset,
4868 htab->elf.sgotplt->contents);
4869 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4870 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4871 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4874 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4878 /* Adjust .eh_frame for .plt section. */
4879 if (htab->plt_eh_frame != NULL
4880 && htab->plt_eh_frame->contents != NULL)
4882 if (htab->elf.splt != NULL
4883 && htab->elf.splt->size != 0
4884 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4885 && htab->elf.splt->output_section != NULL
4886 && htab->plt_eh_frame->output_section != NULL)
4888 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4889 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4890 + htab->plt_eh_frame->output_offset
4891 + PLT_FDE_START_OFFSET;
4892 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4893 htab->plt_eh_frame->contents
4894 + PLT_FDE_START_OFFSET);
4896 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4898 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4900 htab->plt_eh_frame->contents))
4905 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4906 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4909 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4910 htab_traverse (htab->loc_hash_table,
4911 elf_x86_64_finish_local_dynamic_symbol,
4917 /* Return address for Ith PLT stub in section PLT, for relocation REL
4918 or (bfd_vma) -1 if it should not be included. */
4921 elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4922 const arelent *rel ATTRIBUTE_UNUSED)
4924 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4927 /* Handle an x86-64 specific section when reading an object file. This
4928 is called when elfcode.h finds a section with an unknown type. */
4931 elf_x86_64_section_from_shdr (bfd *abfd,
4932 Elf_Internal_Shdr *hdr,
4936 if (hdr->sh_type != SHT_X86_64_UNWIND)
4939 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4945 /* Hook called by the linker routine which adds symbols from an object
4946 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4950 elf_x86_64_add_symbol_hook (bfd *abfd,
4951 struct bfd_link_info *info,
4952 Elf_Internal_Sym *sym,
4953 const char **namep ATTRIBUTE_UNUSED,
4954 flagword *flagsp ATTRIBUTE_UNUSED,
4960 switch (sym->st_shndx)
4962 case SHN_X86_64_LCOMMON:
4963 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4966 lcomm = bfd_make_section_with_flags (abfd,
4970 | SEC_LINKER_CREATED));
4973 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4976 *valp = sym->st_size;
4980 if ((abfd->flags & DYNAMIC) == 0
4981 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
4982 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
4983 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
4989 /* Given a BFD section, try to locate the corresponding ELF section
4993 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4994 asection *sec, int *index_return)
4996 if (sec == &_bfd_elf_large_com_section)
4998 *index_return = SHN_X86_64_LCOMMON;
5004 /* Process a symbol. */
5007 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5010 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5012 switch (elfsym->internal_elf_sym.st_shndx)
5014 case SHN_X86_64_LCOMMON:
5015 asym->section = &_bfd_elf_large_com_section;
5016 asym->value = elfsym->internal_elf_sym.st_size;
5017 /* Common symbol doesn't set BSF_GLOBAL. */
5018 asym->flags &= ~BSF_GLOBAL;
5024 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5026 return (sym->st_shndx == SHN_COMMON
5027 || sym->st_shndx == SHN_X86_64_LCOMMON);
5031 elf_x86_64_common_section_index (asection *sec)
5033 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5036 return SHN_X86_64_LCOMMON;
5040 elf_x86_64_common_section (asection *sec)
5042 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5043 return bfd_com_section_ptr;
5045 return &_bfd_elf_large_com_section;
5049 elf_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5050 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
5051 struct elf_link_hash_entry *h,
5052 Elf_Internal_Sym *sym,
5054 bfd_vma *pvalue ATTRIBUTE_UNUSED,
5055 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
5056 bfd_boolean *skip ATTRIBUTE_UNUSED,
5057 bfd_boolean *override ATTRIBUTE_UNUSED,
5058 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
5059 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
5060 bfd_boolean *newdyn ATTRIBUTE_UNUSED,
5061 bfd_boolean *newdef,
5062 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
5063 bfd_boolean *newweak ATTRIBUTE_UNUSED,
5064 bfd *abfd ATTRIBUTE_UNUSED,
5066 bfd_boolean *olddyn ATTRIBUTE_UNUSED,
5067 bfd_boolean *olddef,
5068 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
5069 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
5073 /* A normal common symbol and a large common symbol result in a
5074 normal common symbol. We turn the large common symbol into a
5077 && h->root.type == bfd_link_hash_common
5079 && bfd_is_com_section (*sec)
5082 if (sym->st_shndx == SHN_COMMON
5083 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
5085 h->root.u.c.p->section
5086 = bfd_make_section_old_way (oldbfd, "COMMON");
5087 h->root.u.c.p->section->flags = SEC_ALLOC;
5089 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5090 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
5091 *psec = *sec = bfd_com_section_ptr;
5098 elf_x86_64_additional_program_headers (bfd *abfd,
5099 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5104 /* Check to see if we need a large readonly segment. */
5105 s = bfd_get_section_by_name (abfd, ".lrodata");
5106 if (s && (s->flags & SEC_LOAD))
5109 /* Check to see if we need a large data segment. Since .lbss sections
5110 is placed right after the .bss section, there should be no need for
5111 a large data segment just because of .lbss. */
5112 s = bfd_get_section_by_name (abfd, ".ldata");
5113 if (s && (s->flags & SEC_LOAD))
5119 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5122 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5124 if (h->plt.offset != (bfd_vma) -1
5126 && !h->pointer_equality_needed)
5129 return _bfd_elf_hash_symbol (h);
5132 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5135 elf_x86_64_relocs_compatible (const bfd_target *input,
5136 const bfd_target *output)
5138 return ((xvec_get_elf_backend_data (input)->s->elfclass
5139 == xvec_get_elf_backend_data (output)->s->elfclass)
5140 && _bfd_elf_relocs_compatible (input, output));
5143 static const struct bfd_elf_special_section
5144 elf_x86_64_special_sections[]=
5146 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5147 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5148 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5149 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5150 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5151 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5152 { NULL, 0, 0, 0, 0 }
5155 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
5156 #define TARGET_LITTLE_NAME "elf64-x86-64"
5157 #define ELF_ARCH bfd_arch_i386
5158 #define ELF_TARGET_ID X86_64_ELF_DATA
5159 #define ELF_MACHINE_CODE EM_X86_64
5160 #define ELF_MAXPAGESIZE 0x200000
5161 #define ELF_MINPAGESIZE 0x1000
5162 #define ELF_COMMONPAGESIZE 0x1000
5164 #define elf_backend_can_gc_sections 1
5165 #define elf_backend_can_refcount 1
5166 #define elf_backend_want_got_plt 1
5167 #define elf_backend_plt_readonly 1
5168 #define elf_backend_want_plt_sym 0
5169 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5170 #define elf_backend_rela_normal 1
5171 #define elf_backend_plt_alignment 4
5173 #define elf_info_to_howto elf_x86_64_info_to_howto
5175 #define bfd_elf64_bfd_link_hash_table_create \
5176 elf_x86_64_link_hash_table_create
5177 #define bfd_elf64_bfd_link_hash_table_free \
5178 elf_x86_64_link_hash_table_free
5179 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5180 #define bfd_elf64_bfd_reloc_name_lookup \
5181 elf_x86_64_reloc_name_lookup
5183 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5184 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5185 #define elf_backend_check_relocs elf_x86_64_check_relocs
5186 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5187 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5188 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5189 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5190 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5191 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5192 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5193 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5195 #define elf_backend_write_core_note elf_x86_64_write_core_note
5197 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5198 #define elf_backend_relocate_section elf_x86_64_relocate_section
5199 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5200 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5201 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5202 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5203 #define elf_backend_object_p elf64_x86_64_elf_object_p
5204 #define bfd_elf64_mkobject elf_x86_64_mkobject
5206 #define elf_backend_section_from_shdr \
5207 elf_x86_64_section_from_shdr
5209 #define elf_backend_section_from_bfd_section \
5210 elf_x86_64_elf_section_from_bfd_section
5211 #define elf_backend_add_symbol_hook \
5212 elf_x86_64_add_symbol_hook
5213 #define elf_backend_symbol_processing \
5214 elf_x86_64_symbol_processing
5215 #define elf_backend_common_section_index \
5216 elf_x86_64_common_section_index
5217 #define elf_backend_common_section \
5218 elf_x86_64_common_section
5219 #define elf_backend_common_definition \
5220 elf_x86_64_common_definition
5221 #define elf_backend_merge_symbol \
5222 elf_x86_64_merge_symbol
5223 #define elf_backend_special_sections \
5224 elf_x86_64_special_sections
5225 #define elf_backend_additional_program_headers \
5226 elf_x86_64_additional_program_headers
5227 #define elf_backend_hash_symbol \
5228 elf_x86_64_hash_symbol
5230 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5232 #include "elf64-target.h"
5234 /* FreeBSD support. */
5236 #undef TARGET_LITTLE_SYM
5237 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
5238 #undef TARGET_LITTLE_NAME
5239 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5242 #define ELF_OSABI ELFOSABI_FREEBSD
5245 #define elf64_bed elf64_x86_64_fbsd_bed
5247 #include "elf64-target.h"
5249 /* Solaris 2 support. */
5251 #undef TARGET_LITTLE_SYM
5252 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
5253 #undef TARGET_LITTLE_NAME
5254 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5256 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5257 objects won't be recognized. */
5261 #define elf64_bed elf64_x86_64_sol2_bed
5263 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5265 #undef elf_backend_static_tls_alignment
5266 #define elf_backend_static_tls_alignment 16
5268 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5270 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5272 #undef elf_backend_want_plt_sym
5273 #define elf_backend_want_plt_sym 1
5275 #include "elf64-target.h"
5277 /* Native Client support. */
5279 #undef TARGET_LITTLE_SYM
5280 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec
5281 #undef TARGET_LITTLE_NAME
5282 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5284 #define elf64_bed elf64_x86_64_nacl_bed
5286 #undef ELF_MAXPAGESIZE
5287 #undef ELF_MINPAGESIZE
5288 #undef ELF_COMMONPAGESIZE
5289 #define ELF_MAXPAGESIZE 0x10000
5290 #define ELF_MINPAGESIZE 0x10000
5291 #define ELF_COMMONPAGESIZE 0x10000
5293 /* Restore defaults. */
5295 #undef elf_backend_static_tls_alignment
5296 #undef elf_backend_want_plt_sym
5297 #define elf_backend_want_plt_sym 0
5299 /* NaCl uses substantially different PLT entries for the same effects. */
5301 #undef elf_backend_plt_alignment
5302 #define elf_backend_plt_alignment 5
5303 #define NACL_PLT_ENTRY_SIZE 64
5304 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5306 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5308 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5309 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5310 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5311 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5312 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5314 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5315 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopl %cs:0x0(%rax,%rax,1) */
5317 /* 32 bytes of nop to pad out to the standard size. */
5318 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5319 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5320 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5321 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5322 0x66, /* excess data32 prefix */
5326 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5328 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5329 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5330 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5331 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5333 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5334 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5335 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5337 /* Lazy GOT entries point here (32-byte aligned). */
5338 0x68, /* pushq immediate */
5339 0, 0, 0, 0, /* replaced with index into relocation table. */
5340 0xe9, /* jmp relative */
5341 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5343 /* 22 bytes of nop to pad out to the standard size. */
5344 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5345 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5346 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5349 /* .eh_frame covering the .plt section. */
5351 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
5353 #if (PLT_CIE_LENGTH != 20 \
5354 || PLT_FDE_LENGTH != 36 \
5355 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5356 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5357 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5359 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5360 0, 0, 0, 0, /* CIE ID */
5361 1, /* CIE version */
5362 'z', 'R', 0, /* Augmentation string */
5363 1, /* Code alignment factor */
5364 0x78, /* Data alignment factor */
5365 16, /* Return address column */
5366 1, /* Augmentation size */
5367 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5368 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5369 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5370 DW_CFA_nop, DW_CFA_nop,
5372 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5373 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
5374 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5375 0, 0, 0, 0, /* .plt size goes here */
5376 0, /* Augmentation size */
5377 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
5378 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5379 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
5380 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5381 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5382 13, /* Block length */
5383 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
5384 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
5385 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5386 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
5387 DW_CFA_nop, DW_CFA_nop
5390 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
5392 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
5393 elf_x86_64_nacl_plt_entry, /* plt_entry */
5394 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5395 2, /* plt0_got1_offset */
5396 9, /* plt0_got2_offset */
5397 13, /* plt0_got2_insn_end */
5398 3, /* plt_got_offset */
5399 33, /* plt_reloc_offset */
5400 38, /* plt_plt_offset */
5401 7, /* plt_got_insn_size */
5402 42, /* plt_plt_insn_end */
5403 32, /* plt_lazy_offset */
5404 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
5405 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
5408 #undef elf_backend_arch_data
5409 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5411 #undef elf_backend_modify_segment_map
5412 #define elf_backend_modify_segment_map nacl_modify_segment_map
5413 #undef elf_backend_modify_program_headers
5414 #define elf_backend_modify_program_headers nacl_modify_program_headers
5416 #include "elf64-target.h"
5418 /* Native Client x32 support. */
5420 #undef TARGET_LITTLE_SYM
5421 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec
5422 #undef TARGET_LITTLE_NAME
5423 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5425 #define elf32_bed elf32_x86_64_nacl_bed
5427 #define bfd_elf32_bfd_link_hash_table_create \
5428 elf_x86_64_link_hash_table_create
5429 #define bfd_elf32_bfd_link_hash_table_free \
5430 elf_x86_64_link_hash_table_free
5431 #define bfd_elf32_bfd_reloc_type_lookup \
5432 elf_x86_64_reloc_type_lookup
5433 #define bfd_elf32_bfd_reloc_name_lookup \
5434 elf_x86_64_reloc_name_lookup
5435 #define bfd_elf32_mkobject \
5438 #undef elf_backend_object_p
5439 #define elf_backend_object_p \
5440 elf32_x86_64_elf_object_p
5442 #undef elf_backend_bfd_from_remote_memory
5443 #define elf_backend_bfd_from_remote_memory \
5444 _bfd_elf32_bfd_from_remote_memory
5446 #undef elf_backend_size_info
5447 #define elf_backend_size_info \
5448 _bfd_elf32_size_info
5450 #include "elf32-target.h"
5452 /* Restore defaults. */
5453 #undef elf_backend_object_p
5454 #define elf_backend_object_p elf64_x86_64_elf_object_p
5455 #undef elf_backend_bfd_from_remote_memory
5456 #undef elf_backend_size_info
5457 #undef elf_backend_modify_segment_map
5458 #undef elf_backend_modify_program_headers
5460 /* Intel L1OM support. */
5463 elf64_l1om_elf_object_p (bfd *abfd)
5465 /* Set the right machine number for an L1OM elf64 file. */
5466 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
5470 #undef TARGET_LITTLE_SYM
5471 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
5472 #undef TARGET_LITTLE_NAME
5473 #define TARGET_LITTLE_NAME "elf64-l1om"
5475 #define ELF_ARCH bfd_arch_l1om
5477 #undef ELF_MACHINE_CODE
5478 #define ELF_MACHINE_CODE EM_L1OM
5483 #define elf64_bed elf64_l1om_bed
5485 #undef elf_backend_object_p
5486 #define elf_backend_object_p elf64_l1om_elf_object_p
5488 /* Restore defaults. */
5489 #undef ELF_MAXPAGESIZE
5490 #undef ELF_MINPAGESIZE
5491 #undef ELF_COMMONPAGESIZE
5492 #define ELF_MAXPAGESIZE 0x200000
5493 #define ELF_MINPAGESIZE 0x1000
5494 #define ELF_COMMONPAGESIZE 0x1000
5495 #undef elf_backend_plt_alignment
5496 #define elf_backend_plt_alignment 4
5497 #undef elf_backend_arch_data
5498 #define elf_backend_arch_data &elf_x86_64_arch_bed
5500 #include "elf64-target.h"
5502 /* FreeBSD L1OM support. */
5504 #undef TARGET_LITTLE_SYM
5505 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
5506 #undef TARGET_LITTLE_NAME
5507 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5510 #define ELF_OSABI ELFOSABI_FREEBSD
5513 #define elf64_bed elf64_l1om_fbsd_bed
5515 #include "elf64-target.h"
5517 /* Intel K1OM support. */
5520 elf64_k1om_elf_object_p (bfd *abfd)
5522 /* Set the right machine number for an K1OM elf64 file. */
5523 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
5527 #undef TARGET_LITTLE_SYM
5528 #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec
5529 #undef TARGET_LITTLE_NAME
5530 #define TARGET_LITTLE_NAME "elf64-k1om"
5532 #define ELF_ARCH bfd_arch_k1om
5534 #undef ELF_MACHINE_CODE
5535 #define ELF_MACHINE_CODE EM_K1OM
5540 #define elf64_bed elf64_k1om_bed
5542 #undef elf_backend_object_p
5543 #define elf_backend_object_p elf64_k1om_elf_object_p
5545 #undef elf_backend_static_tls_alignment
5547 #undef elf_backend_want_plt_sym
5548 #define elf_backend_want_plt_sym 0
5550 #include "elf64-target.h"
5552 /* FreeBSD K1OM support. */
5554 #undef TARGET_LITTLE_SYM
5555 #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec
5556 #undef TARGET_LITTLE_NAME
5557 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5560 #define ELF_OSABI ELFOSABI_FREEBSD
5563 #define elf64_bed elf64_k1om_fbsd_bed
5565 #include "elf64-target.h"
5567 /* 32bit x86-64 support. */
5569 #undef TARGET_LITTLE_SYM
5570 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
5571 #undef TARGET_LITTLE_NAME
5572 #define TARGET_LITTLE_NAME "elf32-x86-64"
5576 #define ELF_ARCH bfd_arch_i386
5578 #undef ELF_MACHINE_CODE
5579 #define ELF_MACHINE_CODE EM_X86_64
5583 #undef elf_backend_object_p
5584 #define elf_backend_object_p \
5585 elf32_x86_64_elf_object_p
5587 #undef elf_backend_bfd_from_remote_memory
5588 #define elf_backend_bfd_from_remote_memory \
5589 _bfd_elf32_bfd_from_remote_memory
5591 #undef elf_backend_size_info
5592 #define elf_backend_size_info \
5593 _bfd_elf32_size_info
5595 #include "elf32-target.h"