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,
153 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
154 complain_overflow_bitfield, bfd_elf_generic_reloc,
155 "R_X86_64_GOTPC32_TLSDESC",
156 FALSE, 0xffffffff, 0xffffffff, TRUE),
157 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
158 complain_overflow_dont, bfd_elf_generic_reloc,
159 "R_X86_64_TLSDESC_CALL",
161 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
162 complain_overflow_bitfield, bfd_elf_generic_reloc,
164 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
165 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
166 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
168 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
172 /* We have a gap in the reloc numbers here.
173 R_X86_64_standard counts the number up to this point, and
174 R_X86_64_vt_offset is the value to subtract from a reloc type of
175 R_X86_64_GNU_VT* to form an index into this table. */
176 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
177 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
179 /* GNU extension to record C++ vtable hierarchy. */
180 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
181 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
183 /* GNU extension to record C++ vtable member usage. */
184 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
185 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
188 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
189 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
190 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
194 #define IS_X86_64_PCREL_TYPE(TYPE) \
195 ( ((TYPE) == R_X86_64_PC8) \
196 || ((TYPE) == R_X86_64_PC16) \
197 || ((TYPE) == R_X86_64_PC32) \
198 || ((TYPE) == R_X86_64_PC64))
200 /* Map BFD relocs to the x86_64 elf relocs. */
203 bfd_reloc_code_real_type bfd_reloc_val;
204 unsigned char elf_reloc_val;
207 static const struct elf_reloc_map x86_64_reloc_map[] =
209 { BFD_RELOC_NONE, R_X86_64_NONE, },
210 { BFD_RELOC_64, R_X86_64_64, },
211 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
212 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
213 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
214 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
215 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
216 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
217 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
218 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
219 { BFD_RELOC_32, R_X86_64_32, },
220 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
221 { BFD_RELOC_16, R_X86_64_16, },
222 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
223 { BFD_RELOC_8, R_X86_64_8, },
224 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
225 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
226 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
227 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
228 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
229 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
230 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
231 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
232 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
233 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
234 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
235 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
236 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
237 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
238 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
239 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
240 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
241 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
242 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
243 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
244 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
245 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
246 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
249 static reloc_howto_type *
250 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
254 if (r_type == (unsigned int) R_X86_64_32)
259 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
261 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
262 || r_type >= (unsigned int) R_X86_64_max)
264 if (r_type >= (unsigned int) R_X86_64_standard)
266 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
268 r_type = R_X86_64_NONE;
273 i = r_type - (unsigned int) R_X86_64_vt_offset;
274 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
275 return &x86_64_elf_howto_table[i];
278 /* Given a BFD reloc type, return a HOWTO structure. */
279 static reloc_howto_type *
280 elf_x86_64_reloc_type_lookup (bfd *abfd,
281 bfd_reloc_code_real_type code)
285 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
288 if (x86_64_reloc_map[i].bfd_reloc_val == code)
289 return elf_x86_64_rtype_to_howto (abfd,
290 x86_64_reloc_map[i].elf_reloc_val);
295 static reloc_howto_type *
296 elf_x86_64_reloc_name_lookup (bfd *abfd,
301 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
303 /* Get x32 R_X86_64_32. */
304 reloc_howto_type *reloc
305 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
306 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
310 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
311 if (x86_64_elf_howto_table[i].name != NULL
312 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
313 return &x86_64_elf_howto_table[i];
318 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
321 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
322 Elf_Internal_Rela *dst)
326 r_type = ELF32_R_TYPE (dst->r_info);
327 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
328 BFD_ASSERT (r_type == cache_ptr->howto->type);
331 /* Support for core dump NOTE sections. */
333 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
338 switch (note->descsz)
343 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
345 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
348 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
356 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
358 elf_tdata (abfd)->core_signal
359 = bfd_get_16 (abfd, note->descdata + 12);
362 elf_tdata (abfd)->core_lwpid
363 = bfd_get_32 (abfd, note->descdata + 32);
372 /* Make a ".reg/999" section. */
373 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
374 size, note->descpos + offset);
378 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
380 switch (note->descsz)
385 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
386 elf_tdata (abfd)->core_pid
387 = bfd_get_32 (abfd, note->descdata + 12);
388 elf_tdata (abfd)->core_program
389 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
390 elf_tdata (abfd)->core_command
391 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
394 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
395 elf_tdata (abfd)->core_pid
396 = bfd_get_32 (abfd, note->descdata + 24);
397 elf_tdata (abfd)->core_program
398 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
399 elf_tdata (abfd)->core_command
400 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
403 /* Note that for some reason, a spurious space is tacked
404 onto the end of the args in some (at least one anyway)
405 implementations, so strip it off if it exists. */
408 char *command = elf_tdata (abfd)->core_command;
409 int n = strlen (command);
411 if (0 < n && command[n - 1] == ' ')
412 command[n - 1] = '\0';
420 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
423 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
425 const char *fname, *psargs;
436 va_start (ap, note_type);
437 fname = va_arg (ap, const char *);
438 psargs = va_arg (ap, const char *);
441 if (bed->s->elfclass == ELFCLASS32)
444 memset (&data, 0, sizeof (data));
445 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
446 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
447 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
448 &data, sizeof (data));
453 memset (&data, 0, sizeof (data));
454 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
455 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
456 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
457 &data, sizeof (data));
462 va_start (ap, note_type);
463 pid = va_arg (ap, long);
464 cursig = va_arg (ap, int);
465 gregs = va_arg (ap, const void *);
468 if (bed->s->elfclass == ELFCLASS32)
470 if (bed->elf_machine_code == EM_X86_64)
472 prstatusx32_t prstat;
473 memset (&prstat, 0, sizeof (prstat));
475 prstat.pr_cursig = cursig;
476 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
477 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
478 &prstat, sizeof (prstat));
483 memset (&prstat, 0, sizeof (prstat));
485 prstat.pr_cursig = cursig;
486 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
487 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
488 &prstat, sizeof (prstat));
494 memset (&prstat, 0, sizeof (prstat));
496 prstat.pr_cursig = cursig;
497 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
498 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
499 &prstat, sizeof (prstat));
506 /* Functions for the x86-64 ELF linker. */
508 /* The name of the dynamic interpreter. This is put in the .interp
511 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
512 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
514 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
515 copying dynamic variables from a shared lib into an app's dynbss
516 section, and instead use a dynamic relocation to point into the
518 #define ELIMINATE_COPY_RELOCS 1
520 /* The size in bytes of an entry in the global offset table. */
522 #define GOT_ENTRY_SIZE 8
524 /* The size in bytes of an entry in the procedure linkage table. */
526 #define PLT_ENTRY_SIZE 16
528 /* The first entry in a procedure linkage table looks like this. See the
529 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
531 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
533 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
534 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
535 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
538 /* Subsequent entries in a procedure linkage table look like this. */
540 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
542 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
543 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
544 0x68, /* pushq immediate */
545 0, 0, 0, 0, /* replaced with index into relocation table. */
546 0xe9, /* jmp relative */
547 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
550 /* .eh_frame covering the .plt section. */
552 static const bfd_byte elf_x86_64_eh_frame_plt[] =
554 #define PLT_CIE_LENGTH 20
555 #define PLT_FDE_LENGTH 36
556 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
557 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
558 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
559 0, 0, 0, 0, /* CIE ID */
561 'z', 'R', 0, /* Augmentation string */
562 1, /* Code alignment factor */
563 0x78, /* Data alignment factor */
564 16, /* Return address column */
565 1, /* Augmentation size */
566 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
567 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
568 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
569 DW_CFA_nop, DW_CFA_nop,
571 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
572 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
573 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
574 0, 0, 0, 0, /* .plt size goes here */
575 0, /* Augmentation size */
576 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
577 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
578 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
579 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
580 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
581 11, /* Block length */
582 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
583 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
584 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
585 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
586 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
589 /* Architecture-specific backend data for x86-64. */
591 struct elf_x86_64_backend_data
593 /* Templates for the initial PLT entry and for subsequent entries. */
594 const bfd_byte *plt0_entry;
595 const bfd_byte *plt_entry;
596 unsigned int plt_entry_size; /* Size of each PLT entry. */
598 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
599 unsigned int plt0_got1_offset;
600 unsigned int plt0_got2_offset;
602 /* Offset of the end of the PC-relative instruction containing
604 unsigned int plt0_got2_insn_end;
606 /* Offsets into plt_entry that are to be replaced with... */
607 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
608 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
609 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
611 /* Length of the PC-relative instruction containing plt_got_offset. */
612 unsigned int plt_got_insn_size;
614 /* Offset of the end of the PC-relative jump to plt0_entry. */
615 unsigned int plt_plt_insn_end;
617 /* Offset into plt_entry where the initial value of the GOT entry points. */
618 unsigned int plt_lazy_offset;
620 /* .eh_frame covering the .plt section. */
621 const bfd_byte *eh_frame_plt;
622 unsigned int eh_frame_plt_size;
625 #define get_elf_x86_64_backend_data(abfd) \
626 ((const struct elf_x86_64_backend_data *) \
627 get_elf_backend_data (abfd)->arch_data)
629 #define GET_PLT_ENTRY_SIZE(abfd) \
630 get_elf_x86_64_backend_data (abfd)->plt_entry_size
632 /* These are the standard parameters. */
633 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
635 elf_x86_64_plt0_entry, /* plt0_entry */
636 elf_x86_64_plt_entry, /* plt_entry */
637 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
638 2, /* plt0_got1_offset */
639 8, /* plt0_got2_offset */
640 12, /* plt0_got2_insn_end */
641 2, /* plt_got_offset */
642 7, /* plt_reloc_offset */
643 12, /* plt_plt_offset */
644 6, /* plt_got_insn_size */
645 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
646 6, /* plt_lazy_offset */
647 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
648 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
651 #define elf_backend_arch_data &elf_x86_64_arch_bed
653 /* x86-64 ELF linker hash entry. */
655 struct elf_x86_64_link_hash_entry
657 struct elf_link_hash_entry elf;
659 /* Track dynamic relocs copied for this symbol. */
660 struct elf_dyn_relocs *dyn_relocs;
662 #define GOT_UNKNOWN 0
666 #define GOT_TLS_GDESC 4
667 #define GOT_TLS_GD_BOTH_P(type) \
668 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
669 #define GOT_TLS_GD_P(type) \
670 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
671 #define GOT_TLS_GDESC_P(type) \
672 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
673 #define GOT_TLS_GD_ANY_P(type) \
674 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
675 unsigned char tls_type;
677 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
678 starting at the end of the jump table. */
682 #define elf_x86_64_hash_entry(ent) \
683 ((struct elf_x86_64_link_hash_entry *)(ent))
685 struct elf_x86_64_obj_tdata
687 struct elf_obj_tdata root;
689 /* tls_type for each local got entry. */
690 char *local_got_tls_type;
692 /* GOTPLT entries for TLS descriptors. */
693 bfd_vma *local_tlsdesc_gotent;
696 #define elf_x86_64_tdata(abfd) \
697 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
699 #define elf_x86_64_local_got_tls_type(abfd) \
700 (elf_x86_64_tdata (abfd)->local_got_tls_type)
702 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
703 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
705 #define is_x86_64_elf(bfd) \
706 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
707 && elf_tdata (bfd) != NULL \
708 && elf_object_id (bfd) == X86_64_ELF_DATA)
711 elf_x86_64_mkobject (bfd *abfd)
713 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
717 /* x86-64 ELF linker hash table. */
719 struct elf_x86_64_link_hash_table
721 struct elf_link_hash_table elf;
723 /* Short-cuts to get to dynamic linker sections. */
726 asection *plt_eh_frame;
730 bfd_signed_vma refcount;
734 /* The amount of space used by the jump slots in the GOT. */
735 bfd_vma sgotplt_jump_table_size;
737 /* Small local sym cache. */
738 struct sym_cache sym_cache;
740 bfd_vma (*r_info) (bfd_vma, bfd_vma);
741 bfd_vma (*r_sym) (bfd_vma);
742 unsigned int pointer_r_type;
743 const char *dynamic_interpreter;
744 int dynamic_interpreter_size;
746 /* _TLS_MODULE_BASE_ symbol. */
747 struct bfd_link_hash_entry *tls_module_base;
749 /* Used by local STT_GNU_IFUNC symbols. */
750 htab_t loc_hash_table;
751 void * loc_hash_memory;
753 /* The offset into splt of the PLT entry for the TLS descriptor
754 resolver. Special values are 0, if not necessary (or not found
755 to be necessary yet), and -1 if needed but not determined
758 /* The offset into sgot of the GOT entry used by the PLT entry
762 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
763 bfd_vma next_jump_slot_index;
764 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
765 bfd_vma next_irelative_index;
768 /* Get the x86-64 ELF linker hash table from a link_info structure. */
770 #define elf_x86_64_hash_table(p) \
771 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
772 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
774 #define elf_x86_64_compute_jump_table_size(htab) \
775 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
777 /* Create an entry in an x86-64 ELF linker hash table. */
779 static struct bfd_hash_entry *
780 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
781 struct bfd_hash_table *table,
784 /* Allocate the structure if it has not already been allocated by a
788 entry = (struct bfd_hash_entry *)
789 bfd_hash_allocate (table,
790 sizeof (struct elf_x86_64_link_hash_entry));
795 /* Call the allocation method of the superclass. */
796 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
799 struct elf_x86_64_link_hash_entry *eh;
801 eh = (struct elf_x86_64_link_hash_entry *) entry;
802 eh->dyn_relocs = NULL;
803 eh->tls_type = GOT_UNKNOWN;
804 eh->tlsdesc_got = (bfd_vma) -1;
810 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
811 for local symbol so that we can handle local STT_GNU_IFUNC symbols
812 as global symbol. We reuse indx and dynstr_index for local symbol
813 hash since they aren't used by global symbols in this backend. */
816 elf_x86_64_local_htab_hash (const void *ptr)
818 struct elf_link_hash_entry *h
819 = (struct elf_link_hash_entry *) ptr;
820 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
823 /* Compare local hash entries. */
826 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
828 struct elf_link_hash_entry *h1
829 = (struct elf_link_hash_entry *) ptr1;
830 struct elf_link_hash_entry *h2
831 = (struct elf_link_hash_entry *) ptr2;
833 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
836 /* Find and/or create a hash entry for local symbol. */
838 static struct elf_link_hash_entry *
839 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
840 bfd *abfd, const Elf_Internal_Rela *rel,
843 struct elf_x86_64_link_hash_entry e, *ret;
844 asection *sec = abfd->sections;
845 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
846 htab->r_sym (rel->r_info));
849 e.elf.indx = sec->id;
850 e.elf.dynstr_index = htab->r_sym (rel->r_info);
851 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
852 create ? INSERT : NO_INSERT);
859 ret = (struct elf_x86_64_link_hash_entry *) *slot;
863 ret = (struct elf_x86_64_link_hash_entry *)
864 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
865 sizeof (struct elf_x86_64_link_hash_entry));
868 memset (ret, 0, sizeof (*ret));
869 ret->elf.indx = sec->id;
870 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
871 ret->elf.dynindx = -1;
877 /* Create an X86-64 ELF linker hash table. */
879 static struct bfd_link_hash_table *
880 elf_x86_64_link_hash_table_create (bfd *abfd)
882 struct elf_x86_64_link_hash_table *ret;
883 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
885 ret = (struct elf_x86_64_link_hash_table *) bfd_malloc (amt);
889 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
890 elf_x86_64_link_hash_newfunc,
891 sizeof (struct elf_x86_64_link_hash_entry),
900 ret->plt_eh_frame = NULL;
901 ret->sym_cache.abfd = NULL;
902 ret->tlsdesc_plt = 0;
903 ret->tlsdesc_got = 0;
904 ret->tls_ld_got.refcount = 0;
905 ret->sgotplt_jump_table_size = 0;
906 ret->tls_module_base = NULL;
907 ret->next_jump_slot_index = 0;
908 ret->next_irelative_index = 0;
912 ret->r_info = elf64_r_info;
913 ret->r_sym = elf64_r_sym;
914 ret->pointer_r_type = R_X86_64_64;
915 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
916 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
920 ret->r_info = elf32_r_info;
921 ret->r_sym = elf32_r_sym;
922 ret->pointer_r_type = R_X86_64_32;
923 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
924 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
927 ret->loc_hash_table = htab_try_create (1024,
928 elf_x86_64_local_htab_hash,
929 elf_x86_64_local_htab_eq,
931 ret->loc_hash_memory = objalloc_create ();
932 if (!ret->loc_hash_table || !ret->loc_hash_memory)
938 return &ret->elf.root;
941 /* Destroy an X86-64 ELF linker hash table. */
944 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
946 struct elf_x86_64_link_hash_table *htab
947 = (struct elf_x86_64_link_hash_table *) hash;
949 if (htab->loc_hash_table)
950 htab_delete (htab->loc_hash_table);
951 if (htab->loc_hash_memory)
952 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
953 _bfd_generic_link_hash_table_free (hash);
956 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
957 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
961 elf_x86_64_create_dynamic_sections (bfd *dynobj,
962 struct bfd_link_info *info)
964 struct elf_x86_64_link_hash_table *htab;
966 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
969 htab = elf_x86_64_hash_table (info);
973 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
975 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
978 || (!info->shared && !htab->srelbss))
981 if (!info->no_ld_generated_unwind_info
982 && htab->plt_eh_frame == NULL
983 && htab->elf.splt != NULL
984 && bfd_get_section_by_name (dynobj, ".eh_frame") != NULL)
986 const struct elf_x86_64_backend_data *const abed
987 = get_elf_x86_64_backend_data (dynobj);
988 flagword flags = get_elf_backend_data (dynobj)->dynamic_sec_flags;
990 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame",
994 if (htab->plt_eh_frame == NULL
995 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
998 htab->plt_eh_frame->size = abed->eh_frame_plt_size;
999 htab->plt_eh_frame->contents
1000 = bfd_alloc (dynobj, htab->plt_eh_frame->size);
1001 memcpy (htab->plt_eh_frame->contents,
1002 abed->eh_frame_plt, abed->eh_frame_plt_size);
1007 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1010 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1011 struct elf_link_hash_entry *dir,
1012 struct elf_link_hash_entry *ind)
1014 struct elf_x86_64_link_hash_entry *edir, *eind;
1016 edir = (struct elf_x86_64_link_hash_entry *) dir;
1017 eind = (struct elf_x86_64_link_hash_entry *) ind;
1019 if (eind->dyn_relocs != NULL)
1021 if (edir->dyn_relocs != NULL)
1023 struct elf_dyn_relocs **pp;
1024 struct elf_dyn_relocs *p;
1026 /* Add reloc counts against the indirect sym to the direct sym
1027 list. Merge any entries against the same section. */
1028 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1030 struct elf_dyn_relocs *q;
1032 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1033 if (q->sec == p->sec)
1035 q->pc_count += p->pc_count;
1036 q->count += p->count;
1043 *pp = edir->dyn_relocs;
1046 edir->dyn_relocs = eind->dyn_relocs;
1047 eind->dyn_relocs = NULL;
1050 if (ind->root.type == bfd_link_hash_indirect
1051 && dir->got.refcount <= 0)
1053 edir->tls_type = eind->tls_type;
1054 eind->tls_type = GOT_UNKNOWN;
1057 if (ELIMINATE_COPY_RELOCS
1058 && ind->root.type != bfd_link_hash_indirect
1059 && dir->dynamic_adjusted)
1061 /* If called to transfer flags for a weakdef during processing
1062 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1063 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1064 dir->ref_dynamic |= ind->ref_dynamic;
1065 dir->ref_regular |= ind->ref_regular;
1066 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1067 dir->needs_plt |= ind->needs_plt;
1068 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1071 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1075 elf64_x86_64_elf_object_p (bfd *abfd)
1077 /* Set the right machine number for an x86-64 elf64 file. */
1078 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1083 elf32_x86_64_elf_object_p (bfd *abfd)
1085 /* Set the right machine number for an x86-64 elf32 file. */
1086 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1090 /* Return TRUE if the TLS access code sequence support transition
1094 elf_x86_64_check_tls_transition (bfd *abfd,
1095 struct bfd_link_info *info,
1098 Elf_Internal_Shdr *symtab_hdr,
1099 struct elf_link_hash_entry **sym_hashes,
1100 unsigned int r_type,
1101 const Elf_Internal_Rela *rel,
1102 const Elf_Internal_Rela *relend)
1105 unsigned long r_symndx;
1106 struct elf_link_hash_entry *h;
1108 struct elf_x86_64_link_hash_table *htab;
1110 /* Get the section contents. */
1111 if (contents == NULL)
1113 if (elf_section_data (sec)->this_hdr.contents != NULL)
1114 contents = elf_section_data (sec)->this_hdr.contents;
1117 /* FIXME: How to better handle error condition? */
1118 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1121 /* Cache the section contents for elf_link_input_bfd. */
1122 elf_section_data (sec)->this_hdr.contents = contents;
1126 htab = elf_x86_64_hash_table (info);
1127 offset = rel->r_offset;
1130 case R_X86_64_TLSGD:
1131 case R_X86_64_TLSLD:
1132 if ((rel + 1) >= relend)
1135 if (r_type == R_X86_64_TLSGD)
1137 /* Check transition from GD access model. For 64bit, only
1138 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1139 .word 0x6666; rex64; call __tls_get_addr
1140 can transit to different access model. For 32bit, only
1141 leaq foo@tlsgd(%rip), %rdi
1142 .word 0x6666; rex64; call __tls_get_addr
1143 can transit to different access model. */
1145 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1146 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1148 if ((offset + 12) > sec->size
1149 || memcmp (contents + offset + 4, call, 4) != 0)
1152 if (ABI_64_P (abfd))
1155 || memcmp (contents + offset - 4, leaq, 4) != 0)
1161 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1167 /* Check transition from LD access model. Only
1168 leaq foo@tlsld(%rip), %rdi;
1170 can transit to different access model. */
1172 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1174 if (offset < 3 || (offset + 9) > sec->size)
1177 if (memcmp (contents + offset - 3, lea, 3) != 0
1178 || 0xe8 != *(contents + offset + 4))
1182 r_symndx = htab->r_sym (rel[1].r_info);
1183 if (r_symndx < symtab_hdr->sh_info)
1186 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1187 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1188 may be versioned. */
1190 && h->root.root.string != NULL
1191 && (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1192 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
1193 && (strncmp (h->root.root.string,
1194 "__tls_get_addr", 14) == 0));
1196 case R_X86_64_GOTTPOFF:
1197 /* Check transition from IE access model:
1198 mov foo@gottpoff(%rip), %reg
1199 add foo@gottpoff(%rip), %reg
1202 /* Check REX prefix first. */
1203 if (offset >= 3 && (offset + 4) <= sec->size)
1205 val = bfd_get_8 (abfd, contents + offset - 3);
1206 if (val != 0x48 && val != 0x4c)
1208 /* X32 may have 0x44 REX prefix or no REX prefix. */
1209 if (ABI_64_P (abfd))
1215 /* X32 may not have any REX prefix. */
1216 if (ABI_64_P (abfd))
1218 if (offset < 2 || (offset + 3) > sec->size)
1222 val = bfd_get_8 (abfd, contents + offset - 2);
1223 if (val != 0x8b && val != 0x03)
1226 val = bfd_get_8 (abfd, contents + offset - 1);
1227 return (val & 0xc7) == 5;
1229 case R_X86_64_GOTPC32_TLSDESC:
1230 /* Check transition from GDesc access model:
1231 leaq x@tlsdesc(%rip), %rax
1233 Make sure it's a leaq adding rip to a 32-bit offset
1234 into any register, although it's probably almost always
1237 if (offset < 3 || (offset + 4) > sec->size)
1240 val = bfd_get_8 (abfd, contents + offset - 3);
1241 if ((val & 0xfb) != 0x48)
1244 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1247 val = bfd_get_8 (abfd, contents + offset - 1);
1248 return (val & 0xc7) == 0x05;
1250 case R_X86_64_TLSDESC_CALL:
1251 /* Check transition from GDesc access model:
1252 call *x@tlsdesc(%rax)
1254 if (offset + 2 <= sec->size)
1256 /* Make sure that it's a call *x@tlsdesc(%rax). */
1257 static const unsigned char call[] = { 0xff, 0x10 };
1258 return memcmp (contents + offset, call, 2) == 0;
1268 /* Return TRUE if the TLS access transition is OK or no transition
1269 will be performed. Update R_TYPE if there is a transition. */
1272 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1273 asection *sec, bfd_byte *contents,
1274 Elf_Internal_Shdr *symtab_hdr,
1275 struct elf_link_hash_entry **sym_hashes,
1276 unsigned int *r_type, int tls_type,
1277 const Elf_Internal_Rela *rel,
1278 const Elf_Internal_Rela *relend,
1279 struct elf_link_hash_entry *h,
1280 unsigned long r_symndx)
1282 unsigned int from_type = *r_type;
1283 unsigned int to_type = from_type;
1284 bfd_boolean check = TRUE;
1286 /* Skip TLS transition for functions. */
1288 && (h->type == STT_FUNC
1289 || h->type == STT_GNU_IFUNC))
1294 case R_X86_64_TLSGD:
1295 case R_X86_64_GOTPC32_TLSDESC:
1296 case R_X86_64_TLSDESC_CALL:
1297 case R_X86_64_GOTTPOFF:
1298 if (info->executable)
1301 to_type = R_X86_64_TPOFF32;
1303 to_type = R_X86_64_GOTTPOFF;
1306 /* When we are called from elf_x86_64_relocate_section,
1307 CONTENTS isn't NULL and there may be additional transitions
1308 based on TLS_TYPE. */
1309 if (contents != NULL)
1311 unsigned int new_to_type = to_type;
1313 if (info->executable
1316 && tls_type == GOT_TLS_IE)
1317 new_to_type = R_X86_64_TPOFF32;
1319 if (to_type == R_X86_64_TLSGD
1320 || to_type == R_X86_64_GOTPC32_TLSDESC
1321 || to_type == R_X86_64_TLSDESC_CALL)
1323 if (tls_type == GOT_TLS_IE)
1324 new_to_type = R_X86_64_GOTTPOFF;
1327 /* We checked the transition before when we were called from
1328 elf_x86_64_check_relocs. We only want to check the new
1329 transition which hasn't been checked before. */
1330 check = new_to_type != to_type && from_type == to_type;
1331 to_type = new_to_type;
1336 case R_X86_64_TLSLD:
1337 if (info->executable)
1338 to_type = R_X86_64_TPOFF32;
1345 /* Return TRUE if there is no transition. */
1346 if (from_type == to_type)
1349 /* Check if the transition can be performed. */
1351 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1352 symtab_hdr, sym_hashes,
1353 from_type, rel, relend))
1355 reloc_howto_type *from, *to;
1358 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1359 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1362 name = h->root.root.string;
1365 struct elf_x86_64_link_hash_table *htab;
1367 htab = elf_x86_64_hash_table (info);
1372 Elf_Internal_Sym *isym;
1374 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1376 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1380 (*_bfd_error_handler)
1381 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1382 "in section `%A' failed"),
1383 abfd, sec, from->name, to->name, name,
1384 (unsigned long) rel->r_offset);
1385 bfd_set_error (bfd_error_bad_value);
1393 /* Look through the relocs for a section during the first phase, and
1394 calculate needed space in the global offset table, procedure
1395 linkage table, and dynamic reloc sections. */
1398 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1400 const Elf_Internal_Rela *relocs)
1402 struct elf_x86_64_link_hash_table *htab;
1403 Elf_Internal_Shdr *symtab_hdr;
1404 struct elf_link_hash_entry **sym_hashes;
1405 const Elf_Internal_Rela *rel;
1406 const Elf_Internal_Rela *rel_end;
1409 if (info->relocatable)
1412 BFD_ASSERT (is_x86_64_elf (abfd));
1414 htab = elf_x86_64_hash_table (info);
1418 symtab_hdr = &elf_symtab_hdr (abfd);
1419 sym_hashes = elf_sym_hashes (abfd);
1423 rel_end = relocs + sec->reloc_count;
1424 for (rel = relocs; rel < rel_end; rel++)
1426 unsigned int r_type;
1427 unsigned long r_symndx;
1428 struct elf_link_hash_entry *h;
1429 Elf_Internal_Sym *isym;
1432 r_symndx = htab->r_sym (rel->r_info);
1433 r_type = ELF32_R_TYPE (rel->r_info);
1435 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1437 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1442 if (r_symndx < symtab_hdr->sh_info)
1444 /* A local symbol. */
1445 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1450 /* Check relocation against local STT_GNU_IFUNC symbol. */
1451 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1453 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1458 /* Fake a STT_GNU_IFUNC symbol. */
1459 h->type = STT_GNU_IFUNC;
1462 h->forced_local = 1;
1463 h->root.type = bfd_link_hash_defined;
1471 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1472 while (h->root.type == bfd_link_hash_indirect
1473 || h->root.type == bfd_link_hash_warning)
1474 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1477 /* Check invalid x32 relocations. */
1478 if (!ABI_64_P (abfd))
1484 case R_X86_64_DTPOFF64:
1485 case R_X86_64_TPOFF64:
1487 case R_X86_64_GOTOFF64:
1488 case R_X86_64_GOT64:
1489 case R_X86_64_GOTPCREL64:
1490 case R_X86_64_GOTPC64:
1491 case R_X86_64_GOTPLT64:
1492 case R_X86_64_PLTOFF64:
1495 name = h->root.root.string;
1497 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1499 (*_bfd_error_handler)
1500 (_("%B: relocation %s against symbol `%s' isn't "
1501 "supported in x32 mode"), abfd,
1502 x86_64_elf_howto_table[r_type].name, name);
1503 bfd_set_error (bfd_error_bad_value);
1511 /* Create the ifunc sections for static executables. If we
1512 never see an indirect function symbol nor we are building
1513 a static executable, those sections will be empty and
1514 won't appear in output. */
1525 case R_X86_64_PLT32:
1526 case R_X86_64_GOTPCREL:
1527 case R_X86_64_GOTPCREL64:
1528 if (htab->elf.dynobj == NULL)
1529 htab->elf.dynobj = abfd;
1530 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1535 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1536 it here if it is defined in a non-shared object. */
1537 if (h->type == STT_GNU_IFUNC
1540 /* It is referenced by a non-shared object. */
1544 /* STT_GNU_IFUNC symbol must go through PLT. */
1545 h->plt.refcount += 1;
1547 /* STT_GNU_IFUNC needs dynamic sections. */
1548 if (htab->elf.dynobj == NULL)
1549 htab->elf.dynobj = abfd;
1554 if (h->root.root.string)
1555 name = h->root.root.string;
1557 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1559 (*_bfd_error_handler)
1560 (_("%B: relocation %s against STT_GNU_IFUNC "
1561 "symbol `%s' isn't handled by %s"), abfd,
1562 x86_64_elf_howto_table[r_type].name,
1563 name, __FUNCTION__);
1564 bfd_set_error (bfd_error_bad_value);
1568 if (ABI_64_P (abfd))
1572 h->pointer_equality_needed = 1;
1575 /* We must copy these reloc types into the output
1576 file. Create a reloc section in dynobj and
1577 make room for this reloc. */
1578 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1579 (abfd, info, sec, sreloc,
1580 &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs);
1591 if (r_type != R_X86_64_PC32
1592 && r_type != R_X86_64_PC64)
1593 h->pointer_equality_needed = 1;
1596 case R_X86_64_PLT32:
1599 case R_X86_64_GOTPCREL:
1600 case R_X86_64_GOTPCREL64:
1601 h->got.refcount += 1;
1602 if (htab->elf.sgot == NULL
1603 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1613 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1614 symtab_hdr, sym_hashes,
1615 &r_type, GOT_UNKNOWN,
1616 rel, rel_end, h, r_symndx))
1621 case R_X86_64_TLSLD:
1622 htab->tls_ld_got.refcount += 1;
1625 case R_X86_64_TPOFF32:
1626 if (!info->executable && ABI_64_P (abfd))
1629 name = h->root.root.string;
1631 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1633 (*_bfd_error_handler)
1634 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1636 x86_64_elf_howto_table[r_type].name, name);
1637 bfd_set_error (bfd_error_bad_value);
1642 case R_X86_64_GOTTPOFF:
1643 if (!info->executable)
1644 info->flags |= DF_STATIC_TLS;
1647 case R_X86_64_GOT32:
1648 case R_X86_64_GOTPCREL:
1649 case R_X86_64_TLSGD:
1650 case R_X86_64_GOT64:
1651 case R_X86_64_GOTPCREL64:
1652 case R_X86_64_GOTPLT64:
1653 case R_X86_64_GOTPC32_TLSDESC:
1654 case R_X86_64_TLSDESC_CALL:
1655 /* This symbol requires a global offset table entry. */
1657 int tls_type, old_tls_type;
1661 default: tls_type = GOT_NORMAL; break;
1662 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1663 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1664 case R_X86_64_GOTPC32_TLSDESC:
1665 case R_X86_64_TLSDESC_CALL:
1666 tls_type = GOT_TLS_GDESC; break;
1671 if (r_type == R_X86_64_GOTPLT64)
1673 /* This relocation indicates that we also need
1674 a PLT entry, as this is a function. We don't need
1675 a PLT entry for local symbols. */
1677 h->plt.refcount += 1;
1679 h->got.refcount += 1;
1680 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1684 bfd_signed_vma *local_got_refcounts;
1686 /* This is a global offset table entry for a local symbol. */
1687 local_got_refcounts = elf_local_got_refcounts (abfd);
1688 if (local_got_refcounts == NULL)
1692 size = symtab_hdr->sh_info;
1693 size *= sizeof (bfd_signed_vma)
1694 + sizeof (bfd_vma) + sizeof (char);
1695 local_got_refcounts = ((bfd_signed_vma *)
1696 bfd_zalloc (abfd, size));
1697 if (local_got_refcounts == NULL)
1699 elf_local_got_refcounts (abfd) = local_got_refcounts;
1700 elf_x86_64_local_tlsdesc_gotent (abfd)
1701 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1702 elf_x86_64_local_got_tls_type (abfd)
1703 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1705 local_got_refcounts[r_symndx] += 1;
1707 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1710 /* If a TLS symbol is accessed using IE at least once,
1711 there is no point to use dynamic model for it. */
1712 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1713 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1714 || tls_type != GOT_TLS_IE))
1716 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1717 tls_type = old_tls_type;
1718 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1719 && GOT_TLS_GD_ANY_P (tls_type))
1720 tls_type |= old_tls_type;
1724 name = h->root.root.string;
1726 name = bfd_elf_sym_name (abfd, symtab_hdr,
1728 (*_bfd_error_handler)
1729 (_("%B: '%s' accessed both as normal and thread local symbol"),
1735 if (old_tls_type != tls_type)
1738 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1740 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1745 case R_X86_64_GOTOFF64:
1746 case R_X86_64_GOTPC32:
1747 case R_X86_64_GOTPC64:
1749 if (htab->elf.sgot == NULL)
1751 if (htab->elf.dynobj == NULL)
1752 htab->elf.dynobj = abfd;
1753 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1759 case R_X86_64_PLT32:
1760 /* This symbol requires a procedure linkage table entry. We
1761 actually build the entry in adjust_dynamic_symbol,
1762 because this might be a case of linking PIC code which is
1763 never referenced by a dynamic object, in which case we
1764 don't need to generate a procedure linkage table entry
1767 /* If this is a local symbol, we resolve it directly without
1768 creating a procedure linkage table entry. */
1773 h->plt.refcount += 1;
1776 case R_X86_64_PLTOFF64:
1777 /* This tries to form the 'address' of a function relative
1778 to GOT. For global symbols we need a PLT entry. */
1782 h->plt.refcount += 1;
1787 if (!ABI_64_P (abfd))
1792 /* Let's help debug shared library creation. These relocs
1793 cannot be used in shared libs. Don't error out for
1794 sections we don't care about, such as debug sections or
1795 non-constant sections. */
1797 && (sec->flags & SEC_ALLOC) != 0
1798 && (sec->flags & SEC_READONLY) != 0)
1801 name = h->root.root.string;
1803 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1804 (*_bfd_error_handler)
1805 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1806 abfd, x86_64_elf_howto_table[r_type].name, name);
1807 bfd_set_error (bfd_error_bad_value);
1818 if (h != NULL && info->executable)
1820 /* If this reloc is in a read-only section, we might
1821 need a copy reloc. We can't check reliably at this
1822 stage whether the section is read-only, as input
1823 sections have not yet been mapped to output sections.
1824 Tentatively set the flag for now, and correct in
1825 adjust_dynamic_symbol. */
1828 /* We may need a .plt entry if the function this reloc
1829 refers to is in a shared lib. */
1830 h->plt.refcount += 1;
1831 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1832 h->pointer_equality_needed = 1;
1835 /* If we are creating a shared library, and this is a reloc
1836 against a global symbol, or a non PC relative reloc
1837 against a local symbol, then we need to copy the reloc
1838 into the shared library. However, if we are linking with
1839 -Bsymbolic, we do not need to copy a reloc against a
1840 global symbol which is defined in an object we are
1841 including in the link (i.e., DEF_REGULAR is set). At
1842 this point we have not seen all the input files, so it is
1843 possible that DEF_REGULAR is not set now but will be set
1844 later (it is never cleared). In case of a weak definition,
1845 DEF_REGULAR may be cleared later by a strong definition in
1846 a shared library. We account for that possibility below by
1847 storing information in the relocs_copied field of the hash
1848 table entry. A similar situation occurs when creating
1849 shared libraries and symbol visibility changes render the
1852 If on the other hand, we are creating an executable, we
1853 may need to keep relocations for symbols satisfied by a
1854 dynamic library if we manage to avoid copy relocs for the
1857 && (sec->flags & SEC_ALLOC) != 0
1858 && (! IS_X86_64_PCREL_TYPE (r_type)
1860 && (! SYMBOLIC_BIND (info, h)
1861 || h->root.type == bfd_link_hash_defweak
1862 || !h->def_regular))))
1863 || (ELIMINATE_COPY_RELOCS
1865 && (sec->flags & SEC_ALLOC) != 0
1867 && (h->root.type == bfd_link_hash_defweak
1868 || !h->def_regular)))
1870 struct elf_dyn_relocs *p;
1871 struct elf_dyn_relocs **head;
1873 /* We must copy these reloc types into the output file.
1874 Create a reloc section in dynobj and make room for
1878 if (htab->elf.dynobj == NULL)
1879 htab->elf.dynobj = abfd;
1881 sreloc = _bfd_elf_make_dynamic_reloc_section
1882 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1883 abfd, /*rela?*/ TRUE);
1889 /* If this is a global symbol, we count the number of
1890 relocations we need for this symbol. */
1893 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
1897 /* Track dynamic relocs needed for local syms too.
1898 We really need local syms available to do this
1903 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1908 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1912 /* Beware of type punned pointers vs strict aliasing
1914 vpp = &(elf_section_data (s)->local_dynrel);
1915 head = (struct elf_dyn_relocs **)vpp;
1919 if (p == NULL || p->sec != sec)
1921 bfd_size_type amt = sizeof *p;
1923 p = ((struct elf_dyn_relocs *)
1924 bfd_alloc (htab->elf.dynobj, amt));
1935 if (IS_X86_64_PCREL_TYPE (r_type))
1940 /* This relocation describes the C++ object vtable hierarchy.
1941 Reconstruct it for later use during GC. */
1942 case R_X86_64_GNU_VTINHERIT:
1943 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1947 /* This relocation describes which C++ vtable entries are actually
1948 used. Record for later use during GC. */
1949 case R_X86_64_GNU_VTENTRY:
1950 BFD_ASSERT (h != NULL);
1952 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1964 /* Return the section that should be marked against GC for a given
1968 elf_x86_64_gc_mark_hook (asection *sec,
1969 struct bfd_link_info *info,
1970 Elf_Internal_Rela *rel,
1971 struct elf_link_hash_entry *h,
1972 Elf_Internal_Sym *sym)
1975 switch (ELF32_R_TYPE (rel->r_info))
1977 case R_X86_64_GNU_VTINHERIT:
1978 case R_X86_64_GNU_VTENTRY:
1982 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1985 /* Update the got entry reference counts for the section being removed. */
1988 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1990 const Elf_Internal_Rela *relocs)
1992 struct elf_x86_64_link_hash_table *htab;
1993 Elf_Internal_Shdr *symtab_hdr;
1994 struct elf_link_hash_entry **sym_hashes;
1995 bfd_signed_vma *local_got_refcounts;
1996 const Elf_Internal_Rela *rel, *relend;
1998 if (info->relocatable)
2001 htab = elf_x86_64_hash_table (info);
2005 elf_section_data (sec)->local_dynrel = NULL;
2007 symtab_hdr = &elf_symtab_hdr (abfd);
2008 sym_hashes = elf_sym_hashes (abfd);
2009 local_got_refcounts = elf_local_got_refcounts (abfd);
2011 htab = elf_x86_64_hash_table (info);
2012 relend = relocs + sec->reloc_count;
2013 for (rel = relocs; rel < relend; rel++)
2015 unsigned long r_symndx;
2016 unsigned int r_type;
2017 struct elf_link_hash_entry *h = NULL;
2019 r_symndx = htab->r_sym (rel->r_info);
2020 if (r_symndx >= symtab_hdr->sh_info)
2022 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2023 while (h->root.type == bfd_link_hash_indirect
2024 || h->root.type == bfd_link_hash_warning)
2025 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2029 /* A local symbol. */
2030 Elf_Internal_Sym *isym;
2032 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2035 /* Check relocation against local STT_GNU_IFUNC symbol. */
2037 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2039 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2047 struct elf_x86_64_link_hash_entry *eh;
2048 struct elf_dyn_relocs **pp;
2049 struct elf_dyn_relocs *p;
2051 eh = (struct elf_x86_64_link_hash_entry *) h;
2053 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2056 /* Everything must go for SEC. */
2062 r_type = ELF32_R_TYPE (rel->r_info);
2063 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2064 symtab_hdr, sym_hashes,
2065 &r_type, GOT_UNKNOWN,
2066 rel, relend, h, r_symndx))
2071 case R_X86_64_TLSLD:
2072 if (htab->tls_ld_got.refcount > 0)
2073 htab->tls_ld_got.refcount -= 1;
2076 case R_X86_64_TLSGD:
2077 case R_X86_64_GOTPC32_TLSDESC:
2078 case R_X86_64_TLSDESC_CALL:
2079 case R_X86_64_GOTTPOFF:
2080 case R_X86_64_GOT32:
2081 case R_X86_64_GOTPCREL:
2082 case R_X86_64_GOT64:
2083 case R_X86_64_GOTPCREL64:
2084 case R_X86_64_GOTPLT64:
2087 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
2088 h->plt.refcount -= 1;
2089 if (h->got.refcount > 0)
2090 h->got.refcount -= 1;
2091 if (h->type == STT_GNU_IFUNC)
2093 if (h->plt.refcount > 0)
2094 h->plt.refcount -= 1;
2097 else if (local_got_refcounts != NULL)
2099 if (local_got_refcounts[r_symndx] > 0)
2100 local_got_refcounts[r_symndx] -= 1;
2114 && (h == NULL || h->type != STT_GNU_IFUNC))
2118 case R_X86_64_PLT32:
2119 case R_X86_64_PLTOFF64:
2122 if (h->plt.refcount > 0)
2123 h->plt.refcount -= 1;
2135 /* Adjust a symbol defined by a dynamic object and referenced by a
2136 regular object. The current definition is in some section of the
2137 dynamic object, but we're not including those sections. We have to
2138 change the definition to something the rest of the link can
2142 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2143 struct elf_link_hash_entry *h)
2145 struct elf_x86_64_link_hash_table *htab;
2148 /* STT_GNU_IFUNC symbol must go through PLT. */
2149 if (h->type == STT_GNU_IFUNC)
2151 if (h->plt.refcount <= 0)
2153 h->plt.offset = (bfd_vma) -1;
2159 /* If this is a function, put it in the procedure linkage table. We
2160 will fill in the contents of the procedure linkage table later,
2161 when we know the address of the .got section. */
2162 if (h->type == STT_FUNC
2165 if (h->plt.refcount <= 0
2166 || SYMBOL_CALLS_LOCAL (info, h)
2167 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2168 && h->root.type == bfd_link_hash_undefweak))
2170 /* This case can occur if we saw a PLT32 reloc in an input
2171 file, but the symbol was never referred to by a dynamic
2172 object, or if all references were garbage collected. In
2173 such a case, we don't actually need to build a procedure
2174 linkage table, and we can just do a PC32 reloc instead. */
2175 h->plt.offset = (bfd_vma) -1;
2182 /* It's possible that we incorrectly decided a .plt reloc was
2183 needed for an R_X86_64_PC32 reloc to a non-function sym in
2184 check_relocs. We can't decide accurately between function and
2185 non-function syms in check-relocs; Objects loaded later in
2186 the link may change h->type. So fix it now. */
2187 h->plt.offset = (bfd_vma) -1;
2189 /* If this is a weak symbol, and there is a real definition, the
2190 processor independent code will have arranged for us to see the
2191 real definition first, and we can just use the same value. */
2192 if (h->u.weakdef != NULL)
2194 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2195 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2196 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2197 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2198 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2199 h->non_got_ref = h->u.weakdef->non_got_ref;
2203 /* This is a reference to a symbol defined by a dynamic object which
2204 is not a function. */
2206 /* If we are creating a shared library, we must presume that the
2207 only references to the symbol are via the global offset table.
2208 For such cases we need not do anything here; the relocations will
2209 be handled correctly by relocate_section. */
2213 /* If there are no references to this symbol that do not use the
2214 GOT, we don't need to generate a copy reloc. */
2215 if (!h->non_got_ref)
2218 /* If -z nocopyreloc was given, we won't generate them either. */
2219 if (info->nocopyreloc)
2225 if (ELIMINATE_COPY_RELOCS)
2227 struct elf_x86_64_link_hash_entry * eh;
2228 struct elf_dyn_relocs *p;
2230 eh = (struct elf_x86_64_link_hash_entry *) h;
2231 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2233 s = p->sec->output_section;
2234 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2238 /* If we didn't find any dynamic relocs in read-only sections, then
2239 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2247 /* We must allocate the symbol in our .dynbss section, which will
2248 become part of the .bss section of the executable. There will be
2249 an entry for this symbol in the .dynsym section. The dynamic
2250 object will contain position independent code, so all references
2251 from the dynamic object to this symbol will go through the global
2252 offset table. The dynamic linker will use the .dynsym entry to
2253 determine the address it must put in the global offset table, so
2254 both the dynamic object and the regular object will refer to the
2255 same memory location for the variable. */
2257 htab = elf_x86_64_hash_table (info);
2261 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2262 to copy the initial value out of the dynamic object and into the
2263 runtime process image. */
2264 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2266 const struct elf_backend_data *bed;
2267 bed = get_elf_backend_data (info->output_bfd);
2268 htab->srelbss->size += bed->s->sizeof_rela;
2274 return _bfd_elf_adjust_dynamic_copy (h, s);
2277 /* Allocate space in .plt, .got and associated reloc sections for
2281 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2283 struct bfd_link_info *info;
2284 struct elf_x86_64_link_hash_table *htab;
2285 struct elf_x86_64_link_hash_entry *eh;
2286 struct elf_dyn_relocs *p;
2287 const struct elf_backend_data *bed;
2288 unsigned int plt_entry_size;
2290 if (h->root.type == bfd_link_hash_indirect)
2293 eh = (struct elf_x86_64_link_hash_entry *) h;
2295 info = (struct bfd_link_info *) inf;
2296 htab = elf_x86_64_hash_table (info);
2299 bed = get_elf_backend_data (info->output_bfd);
2300 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2302 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2303 here if it is defined and referenced in a non-shared object. */
2304 if (h->type == STT_GNU_IFUNC
2306 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2310 else if (htab->elf.dynamic_sections_created
2311 && h->plt.refcount > 0)
2313 /* Make sure this symbol is output as a dynamic symbol.
2314 Undefined weak syms won't yet be marked as dynamic. */
2315 if (h->dynindx == -1
2316 && !h->forced_local)
2318 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2323 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2325 asection *s = htab->elf.splt;
2327 /* If this is the first .plt entry, make room for the special
2330 s->size += plt_entry_size;
2332 h->plt.offset = s->size;
2334 /* If this symbol is not defined in a regular file, and we are
2335 not generating a shared library, then set the symbol to this
2336 location in the .plt. This is required to make function
2337 pointers compare as equal between the normal executable and
2338 the shared library. */
2342 h->root.u.def.section = s;
2343 h->root.u.def.value = h->plt.offset;
2346 /* Make room for this entry. */
2347 s->size += plt_entry_size;
2349 /* We also need to make an entry in the .got.plt section, which
2350 will be placed in the .got section by the linker script. */
2351 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2353 /* We also need to make an entry in the .rela.plt section. */
2354 htab->elf.srelplt->size += bed->s->sizeof_rela;
2355 htab->elf.srelplt->reloc_count++;
2359 h->plt.offset = (bfd_vma) -1;
2365 h->plt.offset = (bfd_vma) -1;
2369 eh->tlsdesc_got = (bfd_vma) -1;
2371 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2372 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2373 if (h->got.refcount > 0
2376 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2378 h->got.offset = (bfd_vma) -1;
2380 else if (h->got.refcount > 0)
2384 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2386 /* Make sure this symbol is output as a dynamic symbol.
2387 Undefined weak syms won't yet be marked as dynamic. */
2388 if (h->dynindx == -1
2389 && !h->forced_local)
2391 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2395 if (GOT_TLS_GDESC_P (tls_type))
2397 eh->tlsdesc_got = htab->elf.sgotplt->size
2398 - elf_x86_64_compute_jump_table_size (htab);
2399 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2400 h->got.offset = (bfd_vma) -2;
2402 if (! GOT_TLS_GDESC_P (tls_type)
2403 || GOT_TLS_GD_P (tls_type))
2406 h->got.offset = s->size;
2407 s->size += GOT_ENTRY_SIZE;
2408 if (GOT_TLS_GD_P (tls_type))
2409 s->size += GOT_ENTRY_SIZE;
2411 dyn = htab->elf.dynamic_sections_created;
2412 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2414 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2415 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2416 || tls_type == GOT_TLS_IE)
2417 htab->elf.srelgot->size += bed->s->sizeof_rela;
2418 else if (GOT_TLS_GD_P (tls_type))
2419 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2420 else if (! GOT_TLS_GDESC_P (tls_type)
2421 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2422 || h->root.type != bfd_link_hash_undefweak)
2424 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2425 htab->elf.srelgot->size += bed->s->sizeof_rela;
2426 if (GOT_TLS_GDESC_P (tls_type))
2428 htab->elf.srelplt->size += bed->s->sizeof_rela;
2429 htab->tlsdesc_plt = (bfd_vma) -1;
2433 h->got.offset = (bfd_vma) -1;
2435 if (eh->dyn_relocs == NULL)
2438 /* In the shared -Bsymbolic case, discard space allocated for
2439 dynamic pc-relative relocs against symbols which turn out to be
2440 defined in regular objects. For the normal shared case, discard
2441 space for pc-relative relocs that have become local due to symbol
2442 visibility changes. */
2446 /* Relocs that use pc_count are those that appear on a call
2447 insn, or certain REL relocs that can generated via assembly.
2448 We want calls to protected symbols to resolve directly to the
2449 function rather than going via the plt. If people want
2450 function pointer comparisons to work as expected then they
2451 should avoid writing weird assembly. */
2452 if (SYMBOL_CALLS_LOCAL (info, h))
2454 struct elf_dyn_relocs **pp;
2456 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2458 p->count -= p->pc_count;
2467 /* Also discard relocs on undefined weak syms with non-default
2469 if (eh->dyn_relocs != NULL
2470 && h->root.type == bfd_link_hash_undefweak)
2472 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2473 eh->dyn_relocs = NULL;
2475 /* Make sure undefined weak symbols are output as a dynamic
2477 else if (h->dynindx == -1
2478 && ! h->forced_local
2479 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2484 else if (ELIMINATE_COPY_RELOCS)
2486 /* For the non-shared case, discard space for relocs against
2487 symbols which turn out to need copy relocs or are not
2493 || (htab->elf.dynamic_sections_created
2494 && (h->root.type == bfd_link_hash_undefweak
2495 || h->root.type == bfd_link_hash_undefined))))
2497 /* Make sure this symbol is output as a dynamic symbol.
2498 Undefined weak syms won't yet be marked as dynamic. */
2499 if (h->dynindx == -1
2500 && ! h->forced_local
2501 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2504 /* If that succeeded, we know we'll be keeping all the
2506 if (h->dynindx != -1)
2510 eh->dyn_relocs = NULL;
2515 /* Finally, allocate space. */
2516 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2520 sreloc = elf_section_data (p->sec)->sreloc;
2522 BFD_ASSERT (sreloc != NULL);
2524 sreloc->size += p->count * bed->s->sizeof_rela;
2530 /* Allocate space in .plt, .got and associated reloc sections for
2531 local dynamic relocs. */
2534 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2536 struct elf_link_hash_entry *h
2537 = (struct elf_link_hash_entry *) *slot;
2539 if (h->type != STT_GNU_IFUNC
2543 || h->root.type != bfd_link_hash_defined)
2546 return elf_x86_64_allocate_dynrelocs (h, inf);
2549 /* Find any dynamic relocs that apply to read-only sections. */
2552 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2555 struct elf_x86_64_link_hash_entry *eh;
2556 struct elf_dyn_relocs *p;
2558 /* Skip local IFUNC symbols. */
2559 if (h->forced_local && h->type == STT_GNU_IFUNC)
2562 eh = (struct elf_x86_64_link_hash_entry *) h;
2563 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2565 asection *s = p->sec->output_section;
2567 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2569 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2571 info->flags |= DF_TEXTREL;
2573 if (info->warn_shared_textrel && info->shared)
2574 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2575 p->sec->owner, h->root.root.string,
2578 /* Not an error, just cut short the traversal. */
2585 /* Set the sizes of the dynamic sections. */
2588 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2589 struct bfd_link_info *info)
2591 struct elf_x86_64_link_hash_table *htab;
2596 const struct elf_backend_data *bed;
2598 htab = elf_x86_64_hash_table (info);
2601 bed = get_elf_backend_data (output_bfd);
2603 dynobj = htab->elf.dynobj;
2607 if (htab->elf.dynamic_sections_created)
2609 /* Set the contents of the .interp section to the interpreter. */
2610 if (info->executable)
2612 s = bfd_get_section_by_name (dynobj, ".interp");
2615 s->size = htab->dynamic_interpreter_size;
2616 s->contents = (unsigned char *) htab->dynamic_interpreter;
2620 /* Set up .got offsets for local syms, and space for local dynamic
2622 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2624 bfd_signed_vma *local_got;
2625 bfd_signed_vma *end_local_got;
2626 char *local_tls_type;
2627 bfd_vma *local_tlsdesc_gotent;
2628 bfd_size_type locsymcount;
2629 Elf_Internal_Shdr *symtab_hdr;
2632 if (! is_x86_64_elf (ibfd))
2635 for (s = ibfd->sections; s != NULL; s = s->next)
2637 struct elf_dyn_relocs *p;
2639 for (p = (struct elf_dyn_relocs *)
2640 (elf_section_data (s)->local_dynrel);
2644 if (!bfd_is_abs_section (p->sec)
2645 && bfd_is_abs_section (p->sec->output_section))
2647 /* Input section has been discarded, either because
2648 it is a copy of a linkonce section or due to
2649 linker script /DISCARD/, so we'll be discarding
2652 else if (p->count != 0)
2654 srel = elf_section_data (p->sec)->sreloc;
2655 srel->size += p->count * bed->s->sizeof_rela;
2656 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2657 && (info->flags & DF_TEXTREL) == 0)
2659 info->flags |= DF_TEXTREL;
2660 if (info->warn_shared_textrel && info->shared)
2661 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2662 p->sec->owner, p->sec);
2668 local_got = elf_local_got_refcounts (ibfd);
2672 symtab_hdr = &elf_symtab_hdr (ibfd);
2673 locsymcount = symtab_hdr->sh_info;
2674 end_local_got = local_got + locsymcount;
2675 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
2676 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
2678 srel = htab->elf.srelgot;
2679 for (; local_got < end_local_got;
2680 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2682 *local_tlsdesc_gotent = (bfd_vma) -1;
2685 if (GOT_TLS_GDESC_P (*local_tls_type))
2687 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2688 - elf_x86_64_compute_jump_table_size (htab);
2689 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2690 *local_got = (bfd_vma) -2;
2692 if (! GOT_TLS_GDESC_P (*local_tls_type)
2693 || GOT_TLS_GD_P (*local_tls_type))
2695 *local_got = s->size;
2696 s->size += GOT_ENTRY_SIZE;
2697 if (GOT_TLS_GD_P (*local_tls_type))
2698 s->size += GOT_ENTRY_SIZE;
2701 || GOT_TLS_GD_ANY_P (*local_tls_type)
2702 || *local_tls_type == GOT_TLS_IE)
2704 if (GOT_TLS_GDESC_P (*local_tls_type))
2706 htab->elf.srelplt->size
2707 += bed->s->sizeof_rela;
2708 htab->tlsdesc_plt = (bfd_vma) -1;
2710 if (! GOT_TLS_GDESC_P (*local_tls_type)
2711 || GOT_TLS_GD_P (*local_tls_type))
2712 srel->size += bed->s->sizeof_rela;
2716 *local_got = (bfd_vma) -1;
2720 if (htab->tls_ld_got.refcount > 0)
2722 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2724 htab->tls_ld_got.offset = htab->elf.sgot->size;
2725 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2726 htab->elf.srelgot->size += bed->s->sizeof_rela;
2729 htab->tls_ld_got.offset = -1;
2731 /* Allocate global sym .plt and .got entries, and space for global
2732 sym dynamic relocs. */
2733 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
2736 /* Allocate .plt and .got entries, and space for local symbols. */
2737 htab_traverse (htab->loc_hash_table,
2738 elf_x86_64_allocate_local_dynrelocs,
2741 /* For every jump slot reserved in the sgotplt, reloc_count is
2742 incremented. However, when we reserve space for TLS descriptors,
2743 it's not incremented, so in order to compute the space reserved
2744 for them, it suffices to multiply the reloc count by the jump
2747 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2748 so that R_X86_64_IRELATIVE entries come last. */
2749 if (htab->elf.srelplt)
2751 htab->sgotplt_jump_table_size
2752 = elf_x86_64_compute_jump_table_size (htab);
2753 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2755 else if (htab->elf.irelplt)
2756 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2758 if (htab->tlsdesc_plt)
2760 /* If we're not using lazy TLS relocations, don't generate the
2761 PLT and GOT entries they require. */
2762 if ((info->flags & DF_BIND_NOW))
2763 htab->tlsdesc_plt = 0;
2766 htab->tlsdesc_got = htab->elf.sgot->size;
2767 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2768 /* Reserve room for the initial entry.
2769 FIXME: we could probably do away with it in this case. */
2770 if (htab->elf.splt->size == 0)
2771 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2772 htab->tlsdesc_plt = htab->elf.splt->size;
2773 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2777 if (htab->elf.sgotplt)
2779 struct elf_link_hash_entry *got;
2780 got = elf_link_hash_lookup (elf_hash_table (info),
2781 "_GLOBAL_OFFSET_TABLE_",
2782 FALSE, FALSE, FALSE);
2784 /* Don't allocate .got.plt section if there are no GOT nor PLT
2785 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2787 || !got->ref_regular_nonweak)
2788 && (htab->elf.sgotplt->size
2789 == get_elf_backend_data (output_bfd)->got_header_size)
2790 && (htab->elf.splt == NULL
2791 || htab->elf.splt->size == 0)
2792 && (htab->elf.sgot == NULL
2793 || htab->elf.sgot->size == 0)
2794 && (htab->elf.iplt == NULL
2795 || htab->elf.iplt->size == 0)
2796 && (htab->elf.igotplt == NULL
2797 || htab->elf.igotplt->size == 0))
2798 htab->elf.sgotplt->size = 0;
2801 /* We now have determined the sizes of the various dynamic sections.
2802 Allocate memory for them. */
2804 for (s = dynobj->sections; s != NULL; s = s->next)
2806 if ((s->flags & SEC_LINKER_CREATED) == 0)
2809 if (s == htab->elf.splt
2810 || s == htab->elf.sgot
2811 || s == htab->elf.sgotplt
2812 || s == htab->elf.iplt
2813 || s == htab->elf.igotplt
2814 || s == htab->sdynbss)
2816 /* Strip this section if we don't need it; see the
2819 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2821 if (s->size != 0 && s != htab->elf.srelplt)
2824 /* We use the reloc_count field as a counter if we need
2825 to copy relocs into the output file. */
2826 if (s != htab->elf.srelplt)
2831 /* It's not one of our sections, so don't allocate space. */
2837 /* If we don't need this section, strip it from the
2838 output file. This is mostly to handle .rela.bss and
2839 .rela.plt. We must create both sections in
2840 create_dynamic_sections, because they must be created
2841 before the linker maps input sections to output
2842 sections. The linker does that before
2843 adjust_dynamic_symbol is called, and it is that
2844 function which decides whether anything needs to go
2845 into these sections. */
2847 s->flags |= SEC_EXCLUDE;
2851 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2854 /* Allocate memory for the section contents. We use bfd_zalloc
2855 here in case unused entries are not reclaimed before the
2856 section's contents are written out. This should not happen,
2857 but this way if it does, we get a R_X86_64_NONE reloc instead
2859 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2860 if (s->contents == NULL)
2864 if (htab->plt_eh_frame != NULL
2865 && htab->elf.splt != NULL
2866 && htab->elf.splt->size != 0
2867 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0)
2868 bfd_put_32 (dynobj, htab->elf.splt->size,
2869 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2871 if (htab->elf.dynamic_sections_created)
2873 /* Add some entries to the .dynamic section. We fill in the
2874 values later, in elf_x86_64_finish_dynamic_sections, but we
2875 must add the entries now so that we get the correct size for
2876 the .dynamic section. The DT_DEBUG entry is filled in by the
2877 dynamic linker and used by the debugger. */
2878 #define add_dynamic_entry(TAG, VAL) \
2879 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2881 if (info->executable)
2883 if (!add_dynamic_entry (DT_DEBUG, 0))
2887 if (htab->elf.splt->size != 0)
2889 if (!add_dynamic_entry (DT_PLTGOT, 0)
2890 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2891 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2892 || !add_dynamic_entry (DT_JMPREL, 0))
2895 if (htab->tlsdesc_plt
2896 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2897 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2903 if (!add_dynamic_entry (DT_RELA, 0)
2904 || !add_dynamic_entry (DT_RELASZ, 0)
2905 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
2908 /* If any dynamic relocs apply to a read-only section,
2909 then we need a DT_TEXTREL entry. */
2910 if ((info->flags & DF_TEXTREL) == 0)
2911 elf_link_hash_traverse (&htab->elf,
2912 elf_x86_64_readonly_dynrelocs,
2915 if ((info->flags & DF_TEXTREL) != 0)
2917 if (!add_dynamic_entry (DT_TEXTREL, 0))
2922 #undef add_dynamic_entry
2928 elf_x86_64_always_size_sections (bfd *output_bfd,
2929 struct bfd_link_info *info)
2931 asection *tls_sec = elf_hash_table (info)->tls_sec;
2935 struct elf_link_hash_entry *tlsbase;
2937 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2938 "_TLS_MODULE_BASE_",
2939 FALSE, FALSE, FALSE);
2941 if (tlsbase && tlsbase->type == STT_TLS)
2943 struct elf_x86_64_link_hash_table *htab;
2944 struct bfd_link_hash_entry *bh = NULL;
2945 const struct elf_backend_data *bed
2946 = get_elf_backend_data (output_bfd);
2948 htab = elf_x86_64_hash_table (info);
2952 if (!(_bfd_generic_link_add_one_symbol
2953 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2954 tls_sec, 0, NULL, FALSE,
2955 bed->collect, &bh)))
2958 htab->tls_module_base = bh;
2960 tlsbase = (struct elf_link_hash_entry *)bh;
2961 tlsbase->def_regular = 1;
2962 tlsbase->other = STV_HIDDEN;
2963 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2970 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2971 executables. Rather than setting it to the beginning of the TLS
2972 section, we have to set it to the end. This function may be called
2973 multiple times, it is idempotent. */
2976 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
2978 struct elf_x86_64_link_hash_table *htab;
2979 struct bfd_link_hash_entry *base;
2981 if (!info->executable)
2984 htab = elf_x86_64_hash_table (info);
2988 base = htab->tls_module_base;
2992 base->u.def.value = htab->elf.tls_size;
2995 /* Return the base VMA address which should be subtracted from real addresses
2996 when resolving @dtpoff relocation.
2997 This is PT_TLS segment p_vaddr. */
3000 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3002 /* If tls_sec is NULL, we should have signalled an error already. */
3003 if (elf_hash_table (info)->tls_sec == NULL)
3005 return elf_hash_table (info)->tls_sec->vma;
3008 /* Return the relocation value for @tpoff relocation
3009 if STT_TLS virtual address is ADDRESS. */
3012 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3014 struct elf_link_hash_table *htab = elf_hash_table (info);
3015 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3016 bfd_vma static_tls_size;
3018 /* If tls_segment is NULL, we should have signalled an error already. */
3019 if (htab->tls_sec == NULL)
3022 /* Consider special static TLS alignment requirements. */
3023 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3024 return address - static_tls_size - htab->tls_sec->vma;
3027 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3031 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3033 /* Opcode Instruction
3036 0x0f 0x8x conditional jump */
3038 && (contents [offset - 1] == 0xe8
3039 || contents [offset - 1] == 0xe9))
3041 && contents [offset - 2] == 0x0f
3042 && (contents [offset - 1] & 0xf0) == 0x80));
3045 /* Relocate an x86_64 ELF section. */
3048 elf_x86_64_relocate_section (bfd *output_bfd,
3049 struct bfd_link_info *info,
3051 asection *input_section,
3053 Elf_Internal_Rela *relocs,
3054 Elf_Internal_Sym *local_syms,
3055 asection **local_sections)
3057 struct elf_x86_64_link_hash_table *htab;
3058 Elf_Internal_Shdr *symtab_hdr;
3059 struct elf_link_hash_entry **sym_hashes;
3060 bfd_vma *local_got_offsets;
3061 bfd_vma *local_tlsdesc_gotents;
3062 Elf_Internal_Rela *rel;
3063 Elf_Internal_Rela *relend;
3064 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3066 BFD_ASSERT (is_x86_64_elf (input_bfd));
3068 htab = elf_x86_64_hash_table (info);
3071 symtab_hdr = &elf_symtab_hdr (input_bfd);
3072 sym_hashes = elf_sym_hashes (input_bfd);
3073 local_got_offsets = elf_local_got_offsets (input_bfd);
3074 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3076 elf_x86_64_set_tls_module_base (info);
3079 relend = relocs + input_section->reloc_count;
3080 for (; rel < relend; rel++)
3082 unsigned int r_type;
3083 reloc_howto_type *howto;
3084 unsigned long r_symndx;
3085 struct elf_link_hash_entry *h;
3086 Elf_Internal_Sym *sym;
3088 bfd_vma off, offplt;
3090 bfd_boolean unresolved_reloc;
3091 bfd_reloc_status_type r;
3095 r_type = ELF32_R_TYPE (rel->r_info);
3096 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3097 || r_type == (int) R_X86_64_GNU_VTENTRY)
3100 if (r_type >= R_X86_64_max)
3102 bfd_set_error (bfd_error_bad_value);
3106 if (r_type != (int) R_X86_64_32
3107 || ABI_64_P (output_bfd))
3108 howto = x86_64_elf_howto_table + r_type;
3110 howto = (x86_64_elf_howto_table
3111 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3112 r_symndx = htab->r_sym (rel->r_info);
3116 unresolved_reloc = FALSE;
3117 if (r_symndx < symtab_hdr->sh_info)
3119 sym = local_syms + r_symndx;
3120 sec = local_sections[r_symndx];
3122 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3125 /* Relocate against local STT_GNU_IFUNC symbol. */
3126 if (!info->relocatable
3127 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3129 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3134 /* Set STT_GNU_IFUNC symbol value. */
3135 h->root.u.def.value = sym->st_value;
3136 h->root.u.def.section = sec;
3141 bfd_boolean warned ATTRIBUTE_UNUSED;
3143 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3144 r_symndx, symtab_hdr, sym_hashes,
3146 unresolved_reloc, warned);
3149 if (sec != NULL && discarded_section (sec))
3150 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3151 rel, 1, relend, howto, 0, contents);
3153 if (info->relocatable)
3156 if (rel->r_addend == 0
3157 && r_type == R_X86_64_64
3158 && !ABI_64_P (output_bfd))
3160 /* For x32, treat R_X86_64_64 like R_X86_64_32 and zero-extend
3161 it to 64bit if addend is zero. */
3162 r_type = R_X86_64_32;
3163 memset (contents + rel->r_offset + 4, 0, 4);
3166 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3167 it here if it is defined in a non-shared object. */
3169 && h->type == STT_GNU_IFUNC
3176 if ((input_section->flags & SEC_ALLOC) == 0
3177 || h->plt.offset == (bfd_vma) -1)
3180 /* STT_GNU_IFUNC symbol must go through PLT. */
3181 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3182 relocation = (plt->output_section->vma
3183 + plt->output_offset + h->plt.offset);
3188 if (h->root.root.string)
3189 name = h->root.root.string;
3191 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3193 (*_bfd_error_handler)
3194 (_("%B: relocation %s against STT_GNU_IFUNC "
3195 "symbol `%s' isn't handled by %s"), input_bfd,
3196 x86_64_elf_howto_table[r_type].name,
3197 name, __FUNCTION__);
3198 bfd_set_error (bfd_error_bad_value);
3207 if (ABI_64_P (output_bfd))
3211 if (rel->r_addend != 0)
3213 if (h->root.root.string)
3214 name = h->root.root.string;
3216 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3218 (*_bfd_error_handler)
3219 (_("%B: relocation %s against STT_GNU_IFUNC "
3220 "symbol `%s' has non-zero addend: %d"),
3221 input_bfd, x86_64_elf_howto_table[r_type].name,
3222 name, rel->r_addend);
3223 bfd_set_error (bfd_error_bad_value);
3227 /* Generate dynamic relcoation only when there is a
3228 non-GOT reference in a shared object. */
3229 if (info->shared && h->non_got_ref)
3231 Elf_Internal_Rela outrel;
3234 /* Need a dynamic relocation to get the real function
3236 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3240 if (outrel.r_offset == (bfd_vma) -1
3241 || outrel.r_offset == (bfd_vma) -2)
3244 outrel.r_offset += (input_section->output_section->vma
3245 + input_section->output_offset);
3247 if (h->dynindx == -1
3249 || info->executable)
3251 /* This symbol is resolved locally. */
3252 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3253 outrel.r_addend = (h->root.u.def.value
3254 + h->root.u.def.section->output_section->vma
3255 + h->root.u.def.section->output_offset);
3259 outrel.r_info = htab->r_info (h->dynindx, r_type);
3260 outrel.r_addend = 0;
3263 sreloc = htab->elf.irelifunc;
3264 elf_append_rela (output_bfd, sreloc, &outrel);
3266 /* If this reloc is against an external symbol, we
3267 do not want to fiddle with the addend. Otherwise,
3268 we need to include the symbol value so that it
3269 becomes an addend for the dynamic reloc. For an
3270 internal symbol, we have updated addend. */
3276 case R_X86_64_PLT32:
3279 case R_X86_64_GOTPCREL:
3280 case R_X86_64_GOTPCREL64:
3281 base_got = htab->elf.sgot;
3282 off = h->got.offset;
3284 if (base_got == NULL)
3287 if (off == (bfd_vma) -1)
3289 /* We can't use h->got.offset here to save state, or
3290 even just remember the offset, as finish_dynamic_symbol
3291 would use that as offset into .got. */
3293 if (htab->elf.splt != NULL)
3295 plt_index = h->plt.offset / plt_entry_size - 1;
3296 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3297 base_got = htab->elf.sgotplt;
3301 plt_index = h->plt.offset / plt_entry_size;
3302 off = plt_index * GOT_ENTRY_SIZE;
3303 base_got = htab->elf.igotplt;
3306 if (h->dynindx == -1
3310 /* This references the local defitionion. We must
3311 initialize this entry in the global offset table.
3312 Since the offset must always be a multiple of 8,
3313 we use the least significant bit to record
3314 whether we have initialized it already.
3316 When doing a dynamic link, we create a .rela.got
3317 relocation entry to initialize the value. This
3318 is done in the finish_dynamic_symbol routine. */
3323 bfd_put_64 (output_bfd, relocation,
3324 base_got->contents + off);
3325 /* Note that this is harmless for the GOTPLT64
3326 case, as -1 | 1 still is -1. */
3332 relocation = (base_got->output_section->vma
3333 + base_got->output_offset + off);
3339 /* When generating a shared object, the relocations handled here are
3340 copied into the output file to be resolved at run time. */
3343 case R_X86_64_GOT32:
3344 case R_X86_64_GOT64:
3345 /* Relocation is to the entry for this symbol in the global
3347 case R_X86_64_GOTPCREL:
3348 case R_X86_64_GOTPCREL64:
3349 /* Use global offset table entry as symbol value. */
3350 case R_X86_64_GOTPLT64:
3351 /* This is the same as GOT64 for relocation purposes, but
3352 indicates the existence of a PLT entry. The difficulty is,
3353 that we must calculate the GOT slot offset from the PLT
3354 offset, if this symbol got a PLT entry (it was global).
3355 Additionally if it's computed from the PLT entry, then that
3356 GOT offset is relative to .got.plt, not to .got. */
3357 base_got = htab->elf.sgot;
3359 if (htab->elf.sgot == NULL)
3366 off = h->got.offset;
3368 && h->plt.offset != (bfd_vma)-1
3369 && off == (bfd_vma)-1)
3371 /* We can't use h->got.offset here to save
3372 state, or even just remember the offset, as
3373 finish_dynamic_symbol would use that as offset into
3375 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3376 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3377 base_got = htab->elf.sgotplt;
3380 dyn = htab->elf.dynamic_sections_created;
3382 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3384 && SYMBOL_REFERENCES_LOCAL (info, h))
3385 || (ELF_ST_VISIBILITY (h->other)
3386 && h->root.type == bfd_link_hash_undefweak))
3388 /* This is actually a static link, or it is a -Bsymbolic
3389 link and the symbol is defined locally, or the symbol
3390 was forced to be local because of a version file. We
3391 must initialize this entry in the global offset table.
3392 Since the offset must always be a multiple of 8, we
3393 use the least significant bit to record whether we
3394 have initialized it already.
3396 When doing a dynamic link, we create a .rela.got
3397 relocation entry to initialize the value. This is
3398 done in the finish_dynamic_symbol routine. */
3403 bfd_put_64 (output_bfd, relocation,
3404 base_got->contents + off);
3405 /* Note that this is harmless for the GOTPLT64 case,
3406 as -1 | 1 still is -1. */
3411 unresolved_reloc = FALSE;
3415 if (local_got_offsets == NULL)
3418 off = local_got_offsets[r_symndx];
3420 /* The offset must always be a multiple of 8. We use
3421 the least significant bit to record whether we have
3422 already generated the necessary reloc. */
3427 bfd_put_64 (output_bfd, relocation,
3428 base_got->contents + off);
3433 Elf_Internal_Rela outrel;
3435 /* We need to generate a R_X86_64_RELATIVE reloc
3436 for the dynamic linker. */
3437 s = htab->elf.srelgot;
3441 outrel.r_offset = (base_got->output_section->vma
3442 + base_got->output_offset
3444 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3445 outrel.r_addend = relocation;
3446 elf_append_rela (output_bfd, s, &outrel);
3449 local_got_offsets[r_symndx] |= 1;
3453 if (off >= (bfd_vma) -2)
3456 relocation = base_got->output_section->vma
3457 + base_got->output_offset + off;
3458 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3459 relocation -= htab->elf.sgotplt->output_section->vma
3460 - htab->elf.sgotplt->output_offset;
3464 case R_X86_64_GOTOFF64:
3465 /* Relocation is relative to the start of the global offset
3468 /* Check to make sure it isn't a protected function symbol
3469 for shared library since it may not be local when used
3470 as function address. */
3471 if (!info->executable
3473 && !SYMBOLIC_BIND (info, h)
3475 && h->type == STT_FUNC
3476 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3478 (*_bfd_error_handler)
3479 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3480 input_bfd, h->root.root.string);
3481 bfd_set_error (bfd_error_bad_value);
3485 /* Note that sgot is not involved in this
3486 calculation. We always want the start of .got.plt. If we
3487 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3488 permitted by the ABI, we might have to change this
3490 relocation -= htab->elf.sgotplt->output_section->vma
3491 + htab->elf.sgotplt->output_offset;
3494 case R_X86_64_GOTPC32:
3495 case R_X86_64_GOTPC64:
3496 /* Use global offset table as symbol value. */
3497 relocation = htab->elf.sgotplt->output_section->vma
3498 + htab->elf.sgotplt->output_offset;
3499 unresolved_reloc = FALSE;
3502 case R_X86_64_PLTOFF64:
3503 /* Relocation is PLT entry relative to GOT. For local
3504 symbols it's the symbol itself relative to GOT. */
3506 /* See PLT32 handling. */
3507 && h->plt.offset != (bfd_vma) -1
3508 && htab->elf.splt != NULL)
3510 relocation = (htab->elf.splt->output_section->vma
3511 + htab->elf.splt->output_offset
3513 unresolved_reloc = FALSE;
3516 relocation -= htab->elf.sgotplt->output_section->vma
3517 + htab->elf.sgotplt->output_offset;
3520 case R_X86_64_PLT32:
3521 /* Relocation is to the entry for this symbol in the
3522 procedure linkage table. */
3524 /* Resolve a PLT32 reloc against a local symbol directly,
3525 without using the procedure linkage table. */
3529 if (h->plt.offset == (bfd_vma) -1
3530 || htab->elf.splt == NULL)
3532 /* We didn't make a PLT entry for this symbol. This
3533 happens when statically linking PIC code, or when
3534 using -Bsymbolic. */
3538 relocation = (htab->elf.splt->output_section->vma
3539 + htab->elf.splt->output_offset
3541 unresolved_reloc = FALSE;
3548 && (input_section->flags & SEC_ALLOC) != 0
3549 && (input_section->flags & SEC_READONLY) != 0
3552 bfd_boolean fail = FALSE;
3554 = (r_type == R_X86_64_PC32
3555 && is_32bit_relative_branch (contents, rel->r_offset));
3557 if (SYMBOL_REFERENCES_LOCAL (info, h))
3559 /* Symbol is referenced locally. Make sure it is
3560 defined locally or for a branch. */
3561 fail = !h->def_regular && !branch;
3565 /* Symbol isn't referenced locally. We only allow
3566 branch to symbol with non-default visibility. */
3568 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3575 const char *pic = "";
3577 switch (ELF_ST_VISIBILITY (h->other))
3580 v = _("hidden symbol");
3583 v = _("internal symbol");
3586 v = _("protected symbol");
3590 pic = _("; recompile with -fPIC");
3595 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3597 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3599 (*_bfd_error_handler) (fmt, input_bfd,
3600 x86_64_elf_howto_table[r_type].name,
3601 v, h->root.root.string, pic);
3602 bfd_set_error (bfd_error_bad_value);
3613 /* FIXME: The ABI says the linker should make sure the value is
3614 the same when it's zeroextended to 64 bit. */
3616 if ((input_section->flags & SEC_ALLOC) == 0)
3621 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3622 || h->root.type != bfd_link_hash_undefweak)
3623 && (! IS_X86_64_PCREL_TYPE (r_type)
3624 || ! SYMBOL_CALLS_LOCAL (info, h)))
3625 || (ELIMINATE_COPY_RELOCS
3632 || h->root.type == bfd_link_hash_undefweak
3633 || h->root.type == bfd_link_hash_undefined)))
3635 Elf_Internal_Rela outrel;
3636 bfd_boolean skip, relocate;
3639 /* When generating a shared object, these relocations
3640 are copied into the output file to be resolved at run
3646 _bfd_elf_section_offset (output_bfd, info, input_section,
3648 if (outrel.r_offset == (bfd_vma) -1)
3650 else if (outrel.r_offset == (bfd_vma) -2)
3651 skip = TRUE, relocate = TRUE;
3653 outrel.r_offset += (input_section->output_section->vma
3654 + input_section->output_offset);
3657 memset (&outrel, 0, sizeof outrel);
3659 /* h->dynindx may be -1 if this symbol was marked to
3663 && (IS_X86_64_PCREL_TYPE (r_type)
3665 || ! SYMBOLIC_BIND (info, h)
3666 || ! h->def_regular))
3668 outrel.r_info = htab->r_info (h->dynindx, r_type);
3669 outrel.r_addend = rel->r_addend;
3673 /* This symbol is local, or marked to become local. */
3674 if (r_type == htab->pointer_r_type)
3677 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3678 outrel.r_addend = relocation + rel->r_addend;
3680 else if (r_type == R_X86_64_64
3681 && !ABI_64_P (output_bfd))
3684 outrel.r_info = htab->r_info (0,
3685 R_X86_64_RELATIVE64);
3686 outrel.r_addend = relocation + rel->r_addend;
3687 /* Check addend overflow. */
3688 if ((outrel.r_addend & 0x80000000)
3689 != (rel->r_addend & 0x80000000))
3692 int addend = rel->r_addend;
3693 if (h && h->root.root.string)
3694 name = h->root.root.string;
3696 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3699 (*_bfd_error_handler)
3700 (_("%B: addend -0x%x in relocation %s against "
3701 "symbol `%s' at 0x%lx in section `%A' is "
3703 input_bfd, input_section, addend,
3704 x86_64_elf_howto_table[r_type].name,
3705 name, (unsigned long) rel->r_offset);
3707 (*_bfd_error_handler)
3708 (_("%B: addend 0x%x in relocation %s against "
3709 "symbol `%s' at 0x%lx in section `%A' is "
3711 input_bfd, input_section, addend,
3712 x86_64_elf_howto_table[r_type].name,
3713 name, (unsigned long) rel->r_offset);
3714 bfd_set_error (bfd_error_bad_value);
3722 if (bfd_is_abs_section (sec))
3724 else if (sec == NULL || sec->owner == NULL)
3726 bfd_set_error (bfd_error_bad_value);
3733 /* We are turning this relocation into one
3734 against a section symbol. It would be
3735 proper to subtract the symbol's value,
3736 osec->vma, from the emitted reloc addend,
3737 but ld.so expects buggy relocs. */
3738 osec = sec->output_section;
3739 sindx = elf_section_data (osec)->dynindx;
3742 asection *oi = htab->elf.text_index_section;
3743 sindx = elf_section_data (oi)->dynindx;
3745 BFD_ASSERT (sindx != 0);
3748 outrel.r_info = htab->r_info (sindx, r_type);
3749 outrel.r_addend = relocation + rel->r_addend;
3753 sreloc = elf_section_data (input_section)->sreloc;
3755 if (sreloc == NULL || sreloc->contents == NULL)
3757 r = bfd_reloc_notsupported;
3758 goto check_relocation_error;
3761 elf_append_rela (output_bfd, sreloc, &outrel);
3763 /* If this reloc is against an external symbol, we do
3764 not want to fiddle with the addend. Otherwise, we
3765 need to include the symbol value so that it becomes
3766 an addend for the dynamic reloc. */
3773 case R_X86_64_TLSGD:
3774 case R_X86_64_GOTPC32_TLSDESC:
3775 case R_X86_64_TLSDESC_CALL:
3776 case R_X86_64_GOTTPOFF:
3777 tls_type = GOT_UNKNOWN;
3778 if (h == NULL && local_got_offsets)
3779 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3781 tls_type = elf_x86_64_hash_entry (h)->tls_type;
3783 if (! elf_x86_64_tls_transition (info, input_bfd,
3784 input_section, contents,
3785 symtab_hdr, sym_hashes,
3786 &r_type, tls_type, rel,
3787 relend, h, r_symndx))
3790 if (r_type == R_X86_64_TPOFF32)
3792 bfd_vma roff = rel->r_offset;
3794 BFD_ASSERT (! unresolved_reloc);
3796 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3798 /* GD->LE transition. For 64bit, change
3799 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3800 .word 0x6666; rex64; call __tls_get_addr
3803 leaq foo@tpoff(%rax), %rax
3805 leaq foo@tlsgd(%rip), %rdi
3806 .word 0x6666; rex64; call __tls_get_addr
3809 leaq foo@tpoff(%rax), %rax */
3810 if (ABI_64_P (output_bfd))
3811 memcpy (contents + roff - 4,
3812 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3815 memcpy (contents + roff - 3,
3816 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3818 bfd_put_32 (output_bfd,
3819 elf_x86_64_tpoff (info, relocation),
3820 contents + roff + 8);
3821 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3825 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3827 /* GDesc -> LE transition.
3828 It's originally something like:
3829 leaq x@tlsdesc(%rip), %rax
3832 movl $x@tpoff, %rax. */
3834 unsigned int val, type;
3836 type = bfd_get_8 (input_bfd, contents + roff - 3);
3837 val = bfd_get_8 (input_bfd, contents + roff - 1);
3838 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3839 contents + roff - 3);
3840 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3841 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3842 contents + roff - 1);
3843 bfd_put_32 (output_bfd,
3844 elf_x86_64_tpoff (info, relocation),
3848 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3850 /* GDesc -> LE transition.
3855 bfd_put_8 (output_bfd, 0x66, contents + roff);
3856 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3859 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3861 /* IE->LE transition:
3862 Originally it can be one of:
3863 movq foo@gottpoff(%rip), %reg
3864 addq foo@gottpoff(%rip), %reg
3867 leaq foo(%reg), %reg
3870 unsigned int val, type, reg;
3872 val = bfd_get_8 (input_bfd, contents + roff - 3);
3873 type = bfd_get_8 (input_bfd, contents + roff - 2);
3874 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3880 bfd_put_8 (output_bfd, 0x49,
3881 contents + roff - 3);
3882 else if (!ABI_64_P (output_bfd) && val == 0x44)
3883 bfd_put_8 (output_bfd, 0x41,
3884 contents + roff - 3);
3885 bfd_put_8 (output_bfd, 0xc7,
3886 contents + roff - 2);
3887 bfd_put_8 (output_bfd, 0xc0 | reg,
3888 contents + roff - 1);
3892 /* addq -> addq - addressing with %rsp/%r12 is
3895 bfd_put_8 (output_bfd, 0x49,
3896 contents + roff - 3);
3897 else if (!ABI_64_P (output_bfd) && val == 0x44)
3898 bfd_put_8 (output_bfd, 0x41,
3899 contents + roff - 3);
3900 bfd_put_8 (output_bfd, 0x81,
3901 contents + roff - 2);
3902 bfd_put_8 (output_bfd, 0xc0 | reg,
3903 contents + roff - 1);
3909 bfd_put_8 (output_bfd, 0x4d,
3910 contents + roff - 3);
3911 else if (!ABI_64_P (output_bfd) && val == 0x44)
3912 bfd_put_8 (output_bfd, 0x45,
3913 contents + roff - 3);
3914 bfd_put_8 (output_bfd, 0x8d,
3915 contents + roff - 2);
3916 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3917 contents + roff - 1);
3919 bfd_put_32 (output_bfd,
3920 elf_x86_64_tpoff (info, relocation),
3928 if (htab->elf.sgot == NULL)
3933 off = h->got.offset;
3934 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
3938 if (local_got_offsets == NULL)
3941 off = local_got_offsets[r_symndx];
3942 offplt = local_tlsdesc_gotents[r_symndx];
3949 Elf_Internal_Rela outrel;
3953 if (htab->elf.srelgot == NULL)
3956 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3958 if (GOT_TLS_GDESC_P (tls_type))
3960 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
3961 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3962 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3963 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3964 + htab->elf.sgotplt->output_offset
3966 + htab->sgotplt_jump_table_size);
3967 sreloc = htab->elf.srelplt;
3969 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
3971 outrel.r_addend = 0;
3972 elf_append_rela (output_bfd, sreloc, &outrel);
3975 sreloc = htab->elf.srelgot;
3977 outrel.r_offset = (htab->elf.sgot->output_section->vma
3978 + htab->elf.sgot->output_offset + off);
3980 if (GOT_TLS_GD_P (tls_type))
3981 dr_type = R_X86_64_DTPMOD64;
3982 else if (GOT_TLS_GDESC_P (tls_type))
3985 dr_type = R_X86_64_TPOFF64;
3987 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3988 outrel.r_addend = 0;
3989 if ((dr_type == R_X86_64_TPOFF64
3990 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3991 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
3992 outrel.r_info = htab->r_info (indx, dr_type);
3994 elf_append_rela (output_bfd, sreloc, &outrel);
3996 if (GOT_TLS_GD_P (tls_type))
4000 BFD_ASSERT (! unresolved_reloc);
4001 bfd_put_64 (output_bfd,
4002 relocation - elf_x86_64_dtpoff_base (info),
4003 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4007 bfd_put_64 (output_bfd, 0,
4008 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4009 outrel.r_info = htab->r_info (indx,
4011 outrel.r_offset += GOT_ENTRY_SIZE;
4012 elf_append_rela (output_bfd, sreloc,
4021 local_got_offsets[r_symndx] |= 1;
4024 if (off >= (bfd_vma) -2
4025 && ! GOT_TLS_GDESC_P (tls_type))
4027 if (r_type == ELF32_R_TYPE (rel->r_info))
4029 if (r_type == R_X86_64_GOTPC32_TLSDESC
4030 || r_type == R_X86_64_TLSDESC_CALL)
4031 relocation = htab->elf.sgotplt->output_section->vma
4032 + htab->elf.sgotplt->output_offset
4033 + offplt + htab->sgotplt_jump_table_size;
4035 relocation = htab->elf.sgot->output_section->vma
4036 + htab->elf.sgot->output_offset + off;
4037 unresolved_reloc = FALSE;
4041 bfd_vma roff = rel->r_offset;
4043 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4045 /* GD->IE transition. For 64bit, change
4046 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4047 .word 0x6666; rex64; call __tls_get_addr@plt
4050 addq foo@gottpoff(%rip), %rax
4052 leaq foo@tlsgd(%rip), %rdi
4053 .word 0x6666; rex64; call __tls_get_addr@plt
4056 addq foo@gottpoff(%rip), %rax */
4057 if (ABI_64_P (output_bfd))
4058 memcpy (contents + roff - 4,
4059 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4062 memcpy (contents + roff - 3,
4063 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4066 relocation = (htab->elf.sgot->output_section->vma
4067 + htab->elf.sgot->output_offset + off
4069 - input_section->output_section->vma
4070 - input_section->output_offset
4072 bfd_put_32 (output_bfd, relocation,
4073 contents + roff + 8);
4074 /* Skip R_X86_64_PLT32. */
4078 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4080 /* GDesc -> IE transition.
4081 It's originally something like:
4082 leaq x@tlsdesc(%rip), %rax
4085 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4087 /* Now modify the instruction as appropriate. To
4088 turn a leaq into a movq in the form we use it, it
4089 suffices to change the second byte from 0x8d to
4091 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4093 bfd_put_32 (output_bfd,
4094 htab->elf.sgot->output_section->vma
4095 + htab->elf.sgot->output_offset + off
4097 - input_section->output_section->vma
4098 - input_section->output_offset
4103 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4105 /* GDesc -> IE transition.
4112 bfd_put_8 (output_bfd, 0x66, contents + roff);
4113 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4121 case R_X86_64_TLSLD:
4122 if (! elf_x86_64_tls_transition (info, input_bfd,
4123 input_section, contents,
4124 symtab_hdr, sym_hashes,
4125 &r_type, GOT_UNKNOWN,
4126 rel, relend, h, r_symndx))
4129 if (r_type != R_X86_64_TLSLD)
4131 /* LD->LE transition:
4132 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4133 For 64bit, we change it into:
4134 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4135 For 32bit, we change it into:
4136 nopl 0x0(%rax); movl %fs:0, %eax. */
4138 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4139 if (ABI_64_P (output_bfd))
4140 memcpy (contents + rel->r_offset - 3,
4141 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4143 memcpy (contents + rel->r_offset - 3,
4144 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4145 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
4150 if (htab->elf.sgot == NULL)
4153 off = htab->tls_ld_got.offset;
4158 Elf_Internal_Rela outrel;
4160 if (htab->elf.srelgot == NULL)
4163 outrel.r_offset = (htab->elf.sgot->output_section->vma
4164 + htab->elf.sgot->output_offset + off);
4166 bfd_put_64 (output_bfd, 0,
4167 htab->elf.sgot->contents + off);
4168 bfd_put_64 (output_bfd, 0,
4169 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4170 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4171 outrel.r_addend = 0;
4172 elf_append_rela (output_bfd, htab->elf.srelgot,
4174 htab->tls_ld_got.offset |= 1;
4176 relocation = htab->elf.sgot->output_section->vma
4177 + htab->elf.sgot->output_offset + off;
4178 unresolved_reloc = FALSE;
4181 case R_X86_64_DTPOFF32:
4182 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4183 relocation -= elf_x86_64_dtpoff_base (info);
4185 relocation = elf_x86_64_tpoff (info, relocation);
4188 case R_X86_64_TPOFF32:
4189 case R_X86_64_TPOFF64:
4190 BFD_ASSERT (info->executable);
4191 relocation = elf_x86_64_tpoff (info, relocation);
4198 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4199 because such sections are not SEC_ALLOC and thus ld.so will
4200 not process them. */
4201 if (unresolved_reloc
4202 && !((input_section->flags & SEC_DEBUGGING) != 0
4204 && _bfd_elf_section_offset (output_bfd, info, input_section,
4205 rel->r_offset) != (bfd_vma) -1)
4206 (*_bfd_error_handler)
4207 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4210 (long) rel->r_offset,
4212 h->root.root.string);
4215 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4216 contents, rel->r_offset,
4217 relocation, rel->r_addend);
4219 check_relocation_error:
4220 if (r != bfd_reloc_ok)
4225 name = h->root.root.string;
4228 name = bfd_elf_string_from_elf_section (input_bfd,
4229 symtab_hdr->sh_link,
4234 name = bfd_section_name (input_bfd, sec);
4237 if (r == bfd_reloc_overflow)
4239 if (! ((*info->callbacks->reloc_overflow)
4240 (info, (h ? &h->root : NULL), name, howto->name,
4241 (bfd_vma) 0, input_bfd, input_section,
4247 (*_bfd_error_handler)
4248 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4249 input_bfd, input_section,
4250 (long) rel->r_offset, name, (int) r);
4259 /* Finish up dynamic symbol handling. We set the contents of various
4260 dynamic sections here. */
4263 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4264 struct bfd_link_info *info,
4265 struct elf_link_hash_entry *h,
4266 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4268 struct elf_x86_64_link_hash_table *htab;
4269 const struct elf_x86_64_backend_data *const abed
4270 = get_elf_x86_64_backend_data (output_bfd);
4272 htab = elf_x86_64_hash_table (info);
4276 if (h->plt.offset != (bfd_vma) -1)
4280 Elf_Internal_Rela rela;
4282 asection *plt, *gotplt, *relplt;
4283 const struct elf_backend_data *bed;
4285 /* When building a static executable, use .iplt, .igot.plt and
4286 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4287 if (htab->elf.splt != NULL)
4289 plt = htab->elf.splt;
4290 gotplt = htab->elf.sgotplt;
4291 relplt = htab->elf.srelplt;
4295 plt = htab->elf.iplt;
4296 gotplt = htab->elf.igotplt;
4297 relplt = htab->elf.irelplt;
4300 /* This symbol has an entry in the procedure linkage table. Set
4302 if ((h->dynindx == -1
4303 && !((h->forced_local || info->executable)
4305 && h->type == STT_GNU_IFUNC))
4311 /* Get the index in the procedure linkage table which
4312 corresponds to this symbol. This is the index of this symbol
4313 in all the symbols for which we are making plt entries. The
4314 first entry in the procedure linkage table is reserved.
4316 Get the offset into the .got table of the entry that
4317 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4318 bytes. The first three are reserved for the dynamic linker.
4320 For static executables, we don't reserve anything. */
4322 if (plt == htab->elf.splt)
4324 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4325 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4329 got_offset = h->plt.offset / abed->plt_entry_size;
4330 got_offset = got_offset * GOT_ENTRY_SIZE;
4333 /* Fill in the entry in the procedure linkage table. */
4334 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4335 abed->plt_entry_size);
4337 /* Insert the relocation positions of the plt section. */
4339 /* Put offset the PC-relative instruction referring to the GOT entry,
4340 subtracting the size of that instruction. */
4341 bfd_put_32 (output_bfd,
4342 (gotplt->output_section->vma
4343 + gotplt->output_offset
4345 - plt->output_section->vma
4346 - plt->output_offset
4348 - abed->plt_got_insn_size),
4349 plt->contents + h->plt.offset + abed->plt_got_offset);
4351 /* Fill in the entry in the global offset table, initially this
4352 points to the second part of the PLT entry. */
4353 bfd_put_64 (output_bfd, (plt->output_section->vma
4354 + plt->output_offset
4355 + h->plt.offset + abed->plt_lazy_offset),
4356 gotplt->contents + got_offset);
4358 /* Fill in the entry in the .rela.plt section. */
4359 rela.r_offset = (gotplt->output_section->vma
4360 + gotplt->output_offset
4362 if (h->dynindx == -1
4363 || ((info->executable
4364 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4366 && h->type == STT_GNU_IFUNC))
4368 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4369 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4370 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4371 rela.r_addend = (h->root.u.def.value
4372 + h->root.u.def.section->output_section->vma
4373 + h->root.u.def.section->output_offset);
4374 /* R_X86_64_IRELATIVE comes last. */
4375 plt_index = htab->next_irelative_index--;
4379 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
4381 plt_index = htab->next_jump_slot_index++;
4384 /* Don't fill PLT entry for static executables. */
4385 if (plt == htab->elf.splt)
4387 /* Put relocation index. */
4388 bfd_put_32 (output_bfd, plt_index,
4389 plt->contents + h->plt.offset + abed->plt_reloc_offset);
4390 /* Put offset for jmp .PLT0. */
4391 bfd_put_32 (output_bfd, - (h->plt.offset + abed->plt_plt_insn_end),
4392 plt->contents + h->plt.offset + abed->plt_plt_offset);
4395 bed = get_elf_backend_data (output_bfd);
4396 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
4397 bed->s->swap_reloca_out (output_bfd, &rela, loc);
4399 if (!h->def_regular)
4401 /* Mark the symbol as undefined, rather than as defined in
4402 the .plt section. Leave the value if there were any
4403 relocations where pointer equality matters (this is a clue
4404 for the dynamic linker, to make function pointer
4405 comparisons work between an application and shared
4406 library), otherwise set it to zero. If a function is only
4407 called from a binary, there is no need to slow down
4408 shared libraries because of that. */
4409 sym->st_shndx = SHN_UNDEF;
4410 if (!h->pointer_equality_needed)
4415 if (h->got.offset != (bfd_vma) -1
4416 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
4417 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
4419 Elf_Internal_Rela rela;
4421 /* This symbol has an entry in the global offset table. Set it
4423 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4426 rela.r_offset = (htab->elf.sgot->output_section->vma
4427 + htab->elf.sgot->output_offset
4428 + (h->got.offset &~ (bfd_vma) 1));
4430 /* If this is a static link, or it is a -Bsymbolic link and the
4431 symbol is defined locally or was forced to be local because
4432 of a version file, we just want to emit a RELATIVE reloc.
4433 The entry in the global offset table will already have been
4434 initialized in the relocate_section function. */
4436 && h->type == STT_GNU_IFUNC)
4440 /* Generate R_X86_64_GLOB_DAT. */
4447 if (!h->pointer_equality_needed)
4450 /* For non-shared object, we can't use .got.plt, which
4451 contains the real function addres if we need pointer
4452 equality. We load the GOT entry with the PLT entry. */
4453 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4454 bfd_put_64 (output_bfd, (plt->output_section->vma
4455 + plt->output_offset
4457 htab->elf.sgot->contents + h->got.offset);
4461 else if (info->shared
4462 && SYMBOL_REFERENCES_LOCAL (info, h))
4464 if (!h->def_regular)
4466 BFD_ASSERT((h->got.offset & 1) != 0);
4467 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4468 rela.r_addend = (h->root.u.def.value
4469 + h->root.u.def.section->output_section->vma
4470 + h->root.u.def.section->output_offset);
4474 BFD_ASSERT((h->got.offset & 1) == 0);
4476 bfd_put_64 (output_bfd, (bfd_vma) 0,
4477 htab->elf.sgot->contents + h->got.offset);
4478 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4482 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
4487 Elf_Internal_Rela rela;
4489 /* This symbol needs a copy reloc. Set it up. */
4491 if (h->dynindx == -1
4492 || (h->root.type != bfd_link_hash_defined
4493 && h->root.type != bfd_link_hash_defweak)
4494 || htab->srelbss == NULL)
4497 rela.r_offset = (h->root.u.def.value
4498 + h->root.u.def.section->output_section->vma
4499 + h->root.u.def.section->output_offset);
4500 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4502 elf_append_rela (output_bfd, htab->srelbss, &rela);
4508 /* Finish up local dynamic symbol handling. We set the contents of
4509 various dynamic sections here. */
4512 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4514 struct elf_link_hash_entry *h
4515 = (struct elf_link_hash_entry *) *slot;
4516 struct bfd_link_info *info
4517 = (struct bfd_link_info *) inf;
4519 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4523 /* Used to decide how to sort relocs in an optimal manner for the
4524 dynamic linker, before writing them out. */
4526 static enum elf_reloc_type_class
4527 elf_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
4529 switch ((int) ELF32_R_TYPE (rela->r_info))
4531 case R_X86_64_RELATIVE:
4532 case R_X86_64_RELATIVE64:
4533 return reloc_class_relative;
4534 case R_X86_64_JUMP_SLOT:
4535 return reloc_class_plt;
4537 return reloc_class_copy;
4539 return reloc_class_normal;
4543 /* Finish up the dynamic sections. */
4546 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4547 struct bfd_link_info *info)
4549 struct elf_x86_64_link_hash_table *htab;
4552 const struct elf_x86_64_backend_data *const abed
4553 = get_elf_x86_64_backend_data (output_bfd);
4555 htab = elf_x86_64_hash_table (info);
4559 dynobj = htab->elf.dynobj;
4560 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4562 if (htab->elf.dynamic_sections_created)
4564 bfd_byte *dyncon, *dynconend;
4565 const struct elf_backend_data *bed;
4566 bfd_size_type sizeof_dyn;
4568 if (sdyn == NULL || htab->elf.sgot == NULL)
4571 bed = get_elf_backend_data (dynobj);
4572 sizeof_dyn = bed->s->sizeof_dyn;
4573 dyncon = sdyn->contents;
4574 dynconend = sdyn->contents + sdyn->size;
4575 for (; dyncon < dynconend; dyncon += sizeof_dyn)
4577 Elf_Internal_Dyn dyn;
4580 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
4588 s = htab->elf.sgotplt;
4589 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4593 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4597 s = htab->elf.srelplt->output_section;
4598 dyn.d_un.d_val = s->size;
4602 /* The procedure linkage table relocs (DT_JMPREL) should
4603 not be included in the overall relocs (DT_RELA).
4604 Therefore, we override the DT_RELASZ entry here to
4605 make it not include the JMPREL relocs. Since the
4606 linker script arranges for .rela.plt to follow all
4607 other relocation sections, we don't have to worry
4608 about changing the DT_RELA entry. */
4609 if (htab->elf.srelplt != NULL)
4611 s = htab->elf.srelplt->output_section;
4612 dyn.d_un.d_val -= s->size;
4616 case DT_TLSDESC_PLT:
4618 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4619 + htab->tlsdesc_plt;
4622 case DT_TLSDESC_GOT:
4624 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4625 + htab->tlsdesc_got;
4629 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
4632 /* Fill in the special first entry in the procedure linkage table. */
4633 if (htab->elf.splt && htab->elf.splt->size > 0)
4635 /* Fill in the first entry in the procedure linkage table. */
4636 memcpy (htab->elf.splt->contents,
4637 abed->plt0_entry, abed->plt_entry_size);
4638 /* Add offset for pushq GOT+8(%rip), since the instruction
4639 uses 6 bytes subtract this value. */
4640 bfd_put_32 (output_bfd,
4641 (htab->elf.sgotplt->output_section->vma
4642 + htab->elf.sgotplt->output_offset
4644 - htab->elf.splt->output_section->vma
4645 - htab->elf.splt->output_offset
4647 htab->elf.splt->contents + abed->plt0_got1_offset);
4648 /* Add offset for the PC-relative instruction accessing GOT+16,
4649 subtracting the offset to the end of that instruction. */
4650 bfd_put_32 (output_bfd,
4651 (htab->elf.sgotplt->output_section->vma
4652 + htab->elf.sgotplt->output_offset
4654 - htab->elf.splt->output_section->vma
4655 - htab->elf.splt->output_offset
4656 - abed->plt0_got2_insn_end),
4657 htab->elf.splt->contents + abed->plt0_got2_offset);
4659 elf_section_data (htab->elf.splt->output_section)
4660 ->this_hdr.sh_entsize = abed->plt_entry_size;
4662 if (htab->tlsdesc_plt)
4664 bfd_put_64 (output_bfd, (bfd_vma) 0,
4665 htab->elf.sgot->contents + htab->tlsdesc_got);
4667 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4668 abed->plt0_entry, abed->plt_entry_size);
4670 /* Add offset for pushq GOT+8(%rip), since the
4671 instruction uses 6 bytes subtract this value. */
4672 bfd_put_32 (output_bfd,
4673 (htab->elf.sgotplt->output_section->vma
4674 + htab->elf.sgotplt->output_offset
4676 - htab->elf.splt->output_section->vma
4677 - htab->elf.splt->output_offset
4680 htab->elf.splt->contents
4681 + htab->tlsdesc_plt + abed->plt0_got1_offset);
4682 /* Add offset for the PC-relative instruction accessing GOT+TDG,
4683 where TGD stands for htab->tlsdesc_got, subtracting the offset
4684 to the end of that instruction. */
4685 bfd_put_32 (output_bfd,
4686 (htab->elf.sgot->output_section->vma
4687 + htab->elf.sgot->output_offset
4689 - htab->elf.splt->output_section->vma
4690 - htab->elf.splt->output_offset
4692 - abed->plt0_got2_insn_end),
4693 htab->elf.splt->contents
4694 + htab->tlsdesc_plt + abed->plt0_got2_offset);
4699 if (htab->elf.sgotplt)
4701 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4703 (*_bfd_error_handler)
4704 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4708 /* Fill in the first three entries in the global offset table. */
4709 if (htab->elf.sgotplt->size > 0)
4711 /* Set the first entry in the global offset table to the address of
4712 the dynamic section. */
4714 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4716 bfd_put_64 (output_bfd,
4717 sdyn->output_section->vma + sdyn->output_offset,
4718 htab->elf.sgotplt->contents);
4719 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4720 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4721 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4724 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4728 /* Adjust .eh_frame for .plt section. */
4729 if (htab->plt_eh_frame != NULL)
4731 if (htab->elf.splt != NULL
4732 && htab->elf.splt->size != 0
4733 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4734 && htab->elf.splt->output_section != NULL
4735 && htab->plt_eh_frame->output_section != NULL)
4737 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4738 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4739 + htab->plt_eh_frame->output_offset
4740 + PLT_FDE_START_OFFSET;
4741 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4742 htab->plt_eh_frame->contents
4743 + PLT_FDE_START_OFFSET);
4745 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4747 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4749 htab->plt_eh_frame->contents))
4754 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4755 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4758 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4759 htab_traverse (htab->loc_hash_table,
4760 elf_x86_64_finish_local_dynamic_symbol,
4766 /* Return address for Ith PLT stub in section PLT, for relocation REL
4767 or (bfd_vma) -1 if it should not be included. */
4770 elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4771 const arelent *rel ATTRIBUTE_UNUSED)
4773 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4776 /* Handle an x86-64 specific section when reading an object file. This
4777 is called when elfcode.h finds a section with an unknown type. */
4780 elf_x86_64_section_from_shdr (bfd *abfd,
4781 Elf_Internal_Shdr *hdr,
4785 if (hdr->sh_type != SHT_X86_64_UNWIND)
4788 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4794 /* Hook called by the linker routine which adds symbols from an object
4795 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4799 elf_x86_64_add_symbol_hook (bfd *abfd,
4800 struct bfd_link_info *info,
4801 Elf_Internal_Sym *sym,
4802 const char **namep ATTRIBUTE_UNUSED,
4803 flagword *flagsp ATTRIBUTE_UNUSED,
4809 switch (sym->st_shndx)
4811 case SHN_X86_64_LCOMMON:
4812 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4815 lcomm = bfd_make_section_with_flags (abfd,
4819 | SEC_LINKER_CREATED));
4822 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4825 *valp = sym->st_size;
4829 if ((abfd->flags & DYNAMIC) == 0
4830 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
4831 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
4832 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
4838 /* Given a BFD section, try to locate the corresponding ELF section
4842 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4843 asection *sec, int *index_return)
4845 if (sec == &_bfd_elf_large_com_section)
4847 *index_return = SHN_X86_64_LCOMMON;
4853 /* Process a symbol. */
4856 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4859 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4861 switch (elfsym->internal_elf_sym.st_shndx)
4863 case SHN_X86_64_LCOMMON:
4864 asym->section = &_bfd_elf_large_com_section;
4865 asym->value = elfsym->internal_elf_sym.st_size;
4866 /* Common symbol doesn't set BSF_GLOBAL. */
4867 asym->flags &= ~BSF_GLOBAL;
4873 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
4875 return (sym->st_shndx == SHN_COMMON
4876 || sym->st_shndx == SHN_X86_64_LCOMMON);
4880 elf_x86_64_common_section_index (asection *sec)
4882 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4885 return SHN_X86_64_LCOMMON;
4889 elf_x86_64_common_section (asection *sec)
4891 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4892 return bfd_com_section_ptr;
4894 return &_bfd_elf_large_com_section;
4898 elf_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4899 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4900 struct elf_link_hash_entry *h,
4901 Elf_Internal_Sym *sym,
4903 bfd_vma *pvalue ATTRIBUTE_UNUSED,
4904 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4905 bfd_boolean *skip ATTRIBUTE_UNUSED,
4906 bfd_boolean *override ATTRIBUTE_UNUSED,
4907 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4908 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4909 bfd_boolean *newdyn ATTRIBUTE_UNUSED,
4910 bfd_boolean *newdef,
4911 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4912 bfd_boolean *newweak ATTRIBUTE_UNUSED,
4913 bfd *abfd ATTRIBUTE_UNUSED,
4915 bfd_boolean *olddyn ATTRIBUTE_UNUSED,
4916 bfd_boolean *olddef,
4917 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4918 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
4922 /* A normal common symbol and a large common symbol result in a
4923 normal common symbol. We turn the large common symbol into a
4926 && h->root.type == bfd_link_hash_common
4928 && bfd_is_com_section (*sec)
4931 if (sym->st_shndx == SHN_COMMON
4932 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4934 h->root.u.c.p->section
4935 = bfd_make_section_old_way (oldbfd, "COMMON");
4936 h->root.u.c.p->section->flags = SEC_ALLOC;
4938 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4939 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
4940 *psec = *sec = bfd_com_section_ptr;
4947 elf_x86_64_additional_program_headers (bfd *abfd,
4948 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4953 /* Check to see if we need a large readonly segment. */
4954 s = bfd_get_section_by_name (abfd, ".lrodata");
4955 if (s && (s->flags & SEC_LOAD))
4958 /* Check to see if we need a large data segment. Since .lbss sections
4959 is placed right after the .bss section, there should be no need for
4960 a large data segment just because of .lbss. */
4961 s = bfd_get_section_by_name (abfd, ".ldata");
4962 if (s && (s->flags & SEC_LOAD))
4968 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4971 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4973 if (h->plt.offset != (bfd_vma) -1
4975 && !h->pointer_equality_needed)
4978 return _bfd_elf_hash_symbol (h);
4981 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4984 elf_x86_64_relocs_compatible (const bfd_target *input,
4985 const bfd_target *output)
4987 return ((xvec_get_elf_backend_data (input)->s->elfclass
4988 == xvec_get_elf_backend_data (output)->s->elfclass)
4989 && _bfd_elf_relocs_compatible (input, output));
4992 static const struct bfd_elf_special_section
4993 elf_x86_64_special_sections[]=
4995 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4996 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4997 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4998 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4999 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5000 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5001 { NULL, 0, 0, 0, 0 }
5004 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
5005 #define TARGET_LITTLE_NAME "elf64-x86-64"
5006 #define ELF_ARCH bfd_arch_i386
5007 #define ELF_TARGET_ID X86_64_ELF_DATA
5008 #define ELF_MACHINE_CODE EM_X86_64
5009 #define ELF_MAXPAGESIZE 0x200000
5010 #define ELF_MINPAGESIZE 0x1000
5011 #define ELF_COMMONPAGESIZE 0x1000
5013 #define elf_backend_can_gc_sections 1
5014 #define elf_backend_can_refcount 1
5015 #define elf_backend_want_got_plt 1
5016 #define elf_backend_plt_readonly 1
5017 #define elf_backend_want_plt_sym 0
5018 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5019 #define elf_backend_rela_normal 1
5020 #define elf_backend_plt_alignment 4
5022 #define elf_info_to_howto elf_x86_64_info_to_howto
5024 #define bfd_elf64_bfd_link_hash_table_create \
5025 elf_x86_64_link_hash_table_create
5026 #define bfd_elf64_bfd_link_hash_table_free \
5027 elf_x86_64_link_hash_table_free
5028 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5029 #define bfd_elf64_bfd_reloc_name_lookup \
5030 elf_x86_64_reloc_name_lookup
5032 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5033 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5034 #define elf_backend_check_relocs elf_x86_64_check_relocs
5035 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5036 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5037 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5038 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5039 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5040 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5041 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5042 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5044 #define elf_backend_write_core_note elf_x86_64_write_core_note
5046 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5047 #define elf_backend_relocate_section elf_x86_64_relocate_section
5048 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5049 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5050 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5051 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5052 #define elf_backend_object_p elf64_x86_64_elf_object_p
5053 #define bfd_elf64_mkobject elf_x86_64_mkobject
5055 #define elf_backend_section_from_shdr \
5056 elf_x86_64_section_from_shdr
5058 #define elf_backend_section_from_bfd_section \
5059 elf_x86_64_elf_section_from_bfd_section
5060 #define elf_backend_add_symbol_hook \
5061 elf_x86_64_add_symbol_hook
5062 #define elf_backend_symbol_processing \
5063 elf_x86_64_symbol_processing
5064 #define elf_backend_common_section_index \
5065 elf_x86_64_common_section_index
5066 #define elf_backend_common_section \
5067 elf_x86_64_common_section
5068 #define elf_backend_common_definition \
5069 elf_x86_64_common_definition
5070 #define elf_backend_merge_symbol \
5071 elf_x86_64_merge_symbol
5072 #define elf_backend_special_sections \
5073 elf_x86_64_special_sections
5074 #define elf_backend_additional_program_headers \
5075 elf_x86_64_additional_program_headers
5076 #define elf_backend_hash_symbol \
5077 elf_x86_64_hash_symbol
5079 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5081 #include "elf64-target.h"
5083 /* FreeBSD support. */
5085 #undef TARGET_LITTLE_SYM
5086 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
5087 #undef TARGET_LITTLE_NAME
5088 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5091 #define ELF_OSABI ELFOSABI_FREEBSD
5094 #define elf64_bed elf64_x86_64_fbsd_bed
5096 #include "elf64-target.h"
5098 /* Solaris 2 support. */
5100 #undef TARGET_LITTLE_SYM
5101 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
5102 #undef TARGET_LITTLE_NAME
5103 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5105 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5106 objects won't be recognized. */
5110 #define elf64_bed elf64_x86_64_sol2_bed
5112 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5114 #undef elf_backend_static_tls_alignment
5115 #define elf_backend_static_tls_alignment 16
5117 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5119 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5121 #undef elf_backend_want_plt_sym
5122 #define elf_backend_want_plt_sym 1
5124 #include "elf64-target.h"
5126 /* Native Client support. */
5128 #undef TARGET_LITTLE_SYM
5129 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec
5130 #undef TARGET_LITTLE_NAME
5131 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5133 #define elf64_bed elf64_x86_64_nacl_bed
5135 #undef ELF_MAXPAGESIZE
5136 #undef ELF_MINPAGESIZE
5137 #undef ELF_COMMONPAGESIZE
5138 #define ELF_MAXPAGESIZE 0x10000
5139 #define ELF_MINPAGESIZE 0x10000
5140 #define ELF_COMMONPAGESIZE 0x10000
5142 /* Restore defaults. */
5144 #undef elf_backend_static_tls_alignment
5145 #undef elf_backend_want_plt_sym
5146 #define elf_backend_want_plt_sym 0
5148 /* NaCl uses substantially different PLT entries for the same effects. */
5150 #undef elf_backend_plt_alignment
5151 #define elf_backend_plt_alignment 5
5152 #define NACL_PLT_ENTRY_SIZE 64
5153 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5155 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5157 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5158 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5159 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5160 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5161 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5163 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5164 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopl %cs:0x0(%rax,%rax,1) */
5166 /* 32 bytes of nop to pad out to the standard size. */
5167 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5168 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5169 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5170 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5171 0x66, /* excess data32 prefix */
5175 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5177 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5178 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5179 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5180 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5182 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5183 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5184 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5186 /* Lazy GOT entries point here (32-byte aligned). */
5187 0x68, /* pushq immediate */
5188 0, 0, 0, 0, /* replaced with index into relocation table. */
5189 0xe9, /* jmp relative */
5190 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5192 /* 22 bytes of nop to pad out to the standard size. */
5193 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5194 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5195 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5198 /* .eh_frame covering the .plt section. */
5200 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
5202 #if (PLT_CIE_LENGTH != 20 \
5203 || PLT_FDE_LENGTH != 36 \
5204 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5205 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5206 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5208 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5209 0, 0, 0, 0, /* CIE ID */
5210 1, /* CIE version */
5211 'z', 'R', 0, /* Augmentation string */
5212 1, /* Code alignment factor */
5213 0x78, /* Data alignment factor */
5214 16, /* Return address column */
5215 1, /* Augmentation size */
5216 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5217 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5218 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5219 DW_CFA_nop, DW_CFA_nop,
5221 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5222 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
5223 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5224 0, 0, 0, 0, /* .plt size goes here */
5225 0, /* Augmentation size */
5226 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
5227 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5228 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
5229 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5230 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5231 13, /* Block length */
5232 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
5233 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
5234 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5235 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
5236 DW_CFA_nop, DW_CFA_nop
5239 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
5241 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
5242 elf_x86_64_nacl_plt_entry, /* plt_entry */
5243 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5244 2, /* plt0_got1_offset */
5245 9, /* plt0_got2_offset */
5246 13, /* plt0_got2_insn_end */
5247 3, /* plt_got_offset */
5248 33, /* plt_reloc_offset */
5249 38, /* plt_plt_offset */
5250 7, /* plt_got_insn_size */
5251 42, /* plt_plt_insn_end */
5252 32, /* plt_lazy_offset */
5253 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
5254 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
5257 #undef elf_backend_arch_data
5258 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5260 #undef elf_backend_modify_segment_map
5261 #define elf_backend_modify_segment_map nacl_modify_segment_map
5262 #undef elf_backend_modify_program_headers
5263 #define elf_backend_modify_program_headers nacl_modify_program_headers
5265 #include "elf64-target.h"
5267 /* Native Client x32 support. */
5269 #undef TARGET_LITTLE_SYM
5270 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec
5271 #undef TARGET_LITTLE_NAME
5272 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5274 #define elf32_bed elf32_x86_64_nacl_bed
5276 #define bfd_elf32_bfd_link_hash_table_create \
5277 elf_x86_64_link_hash_table_create
5278 #define bfd_elf32_bfd_link_hash_table_free \
5279 elf_x86_64_link_hash_table_free
5280 #define bfd_elf32_bfd_reloc_type_lookup \
5281 elf_x86_64_reloc_type_lookup
5282 #define bfd_elf32_bfd_reloc_name_lookup \
5283 elf_x86_64_reloc_name_lookup
5284 #define bfd_elf32_mkobject \
5287 #undef elf_backend_object_p
5288 #define elf_backend_object_p \
5289 elf32_x86_64_elf_object_p
5291 #undef elf_backend_bfd_from_remote_memory
5292 #define elf_backend_bfd_from_remote_memory \
5293 _bfd_elf32_bfd_from_remote_memory
5295 #undef elf_backend_size_info
5296 #define elf_backend_size_info \
5297 _bfd_elf32_size_info
5299 #include "elf32-target.h"
5301 /* Restore defaults. */
5302 #undef elf_backend_object_p
5303 #define elf_backend_object_p elf64_x86_64_elf_object_p
5304 #undef elf_backend_bfd_from_remote_memory
5305 #undef elf_backend_size_info
5306 #undef elf_backend_modify_segment_map
5307 #undef elf_backend_modify_program_headers
5309 /* Intel L1OM support. */
5312 elf64_l1om_elf_object_p (bfd *abfd)
5314 /* Set the right machine number for an L1OM elf64 file. */
5315 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
5319 #undef TARGET_LITTLE_SYM
5320 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
5321 #undef TARGET_LITTLE_NAME
5322 #define TARGET_LITTLE_NAME "elf64-l1om"
5324 #define ELF_ARCH bfd_arch_l1om
5326 #undef ELF_MACHINE_CODE
5327 #define ELF_MACHINE_CODE EM_L1OM
5332 #define elf64_bed elf64_l1om_bed
5334 #undef elf_backend_object_p
5335 #define elf_backend_object_p elf64_l1om_elf_object_p
5337 /* Restore defaults. */
5338 #undef ELF_MAXPAGESIZE
5339 #undef ELF_MINPAGESIZE
5340 #undef ELF_COMMONPAGESIZE
5341 #define ELF_MAXPAGESIZE 0x200000
5342 #define ELF_MINPAGESIZE 0x1000
5343 #define ELF_COMMONPAGESIZE 0x1000
5344 #undef elf_backend_plt_alignment
5345 #define elf_backend_plt_alignment 4
5346 #undef elf_backend_arch_data
5347 #define elf_backend_arch_data &elf_x86_64_arch_bed
5349 #include "elf64-target.h"
5351 /* FreeBSD L1OM support. */
5353 #undef TARGET_LITTLE_SYM
5354 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
5355 #undef TARGET_LITTLE_NAME
5356 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5359 #define ELF_OSABI ELFOSABI_FREEBSD
5362 #define elf64_bed elf64_l1om_fbsd_bed
5364 #include "elf64-target.h"
5366 /* Intel K1OM support. */
5369 elf64_k1om_elf_object_p (bfd *abfd)
5371 /* Set the right machine number for an K1OM elf64 file. */
5372 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
5376 #undef TARGET_LITTLE_SYM
5377 #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec
5378 #undef TARGET_LITTLE_NAME
5379 #define TARGET_LITTLE_NAME "elf64-k1om"
5381 #define ELF_ARCH bfd_arch_k1om
5383 #undef ELF_MACHINE_CODE
5384 #define ELF_MACHINE_CODE EM_K1OM
5389 #define elf64_bed elf64_k1om_bed
5391 #undef elf_backend_object_p
5392 #define elf_backend_object_p elf64_k1om_elf_object_p
5394 #undef elf_backend_static_tls_alignment
5396 #undef elf_backend_want_plt_sym
5397 #define elf_backend_want_plt_sym 0
5399 #include "elf64-target.h"
5401 /* FreeBSD K1OM support. */
5403 #undef TARGET_LITTLE_SYM
5404 #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec
5405 #undef TARGET_LITTLE_NAME
5406 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5409 #define ELF_OSABI ELFOSABI_FREEBSD
5412 #define elf64_bed elf64_k1om_fbsd_bed
5414 #include "elf64-target.h"
5416 /* 32bit x86-64 support. */
5418 #undef TARGET_LITTLE_SYM
5419 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
5420 #undef TARGET_LITTLE_NAME
5421 #define TARGET_LITTLE_NAME "elf32-x86-64"
5425 #define ELF_ARCH bfd_arch_i386
5427 #undef ELF_MACHINE_CODE
5428 #define ELF_MACHINE_CODE EM_X86_64
5432 #undef elf_backend_object_p
5433 #define elf_backend_object_p \
5434 elf32_x86_64_elf_object_p
5436 #undef elf_backend_bfd_from_remote_memory
5437 #define elf_backend_bfd_from_remote_memory \
5438 _bfd_elf32_bfd_from_remote_memory
5440 #undef elf_backend_size_info
5441 #define elf_backend_size_info \
5442 _bfd_elf32_size_info
5444 #include "elf32-target.h"