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_linker_section (dynobj, ".dynbss");
975 htab->srelbss = bfd_get_linker_section (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)
985 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
986 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
987 | SEC_LINKER_CREATED);
989 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
990 if (htab->plt_eh_frame == NULL
991 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
997 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1000 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1001 struct elf_link_hash_entry *dir,
1002 struct elf_link_hash_entry *ind)
1004 struct elf_x86_64_link_hash_entry *edir, *eind;
1006 edir = (struct elf_x86_64_link_hash_entry *) dir;
1007 eind = (struct elf_x86_64_link_hash_entry *) ind;
1009 if (eind->dyn_relocs != NULL)
1011 if (edir->dyn_relocs != NULL)
1013 struct elf_dyn_relocs **pp;
1014 struct elf_dyn_relocs *p;
1016 /* Add reloc counts against the indirect sym to the direct sym
1017 list. Merge any entries against the same section. */
1018 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1020 struct elf_dyn_relocs *q;
1022 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1023 if (q->sec == p->sec)
1025 q->pc_count += p->pc_count;
1026 q->count += p->count;
1033 *pp = edir->dyn_relocs;
1036 edir->dyn_relocs = eind->dyn_relocs;
1037 eind->dyn_relocs = NULL;
1040 if (ind->root.type == bfd_link_hash_indirect
1041 && dir->got.refcount <= 0)
1043 edir->tls_type = eind->tls_type;
1044 eind->tls_type = GOT_UNKNOWN;
1047 if (ELIMINATE_COPY_RELOCS
1048 && ind->root.type != bfd_link_hash_indirect
1049 && dir->dynamic_adjusted)
1051 /* If called to transfer flags for a weakdef during processing
1052 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1053 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1054 dir->ref_dynamic |= ind->ref_dynamic;
1055 dir->ref_regular |= ind->ref_regular;
1056 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1057 dir->needs_plt |= ind->needs_plt;
1058 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1061 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1065 elf64_x86_64_elf_object_p (bfd *abfd)
1067 /* Set the right machine number for an x86-64 elf64 file. */
1068 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1073 elf32_x86_64_elf_object_p (bfd *abfd)
1075 /* Set the right machine number for an x86-64 elf32 file. */
1076 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1080 /* Return TRUE if the TLS access code sequence support transition
1084 elf_x86_64_check_tls_transition (bfd *abfd,
1085 struct bfd_link_info *info,
1088 Elf_Internal_Shdr *symtab_hdr,
1089 struct elf_link_hash_entry **sym_hashes,
1090 unsigned int r_type,
1091 const Elf_Internal_Rela *rel,
1092 const Elf_Internal_Rela *relend)
1095 unsigned long r_symndx;
1096 struct elf_link_hash_entry *h;
1098 struct elf_x86_64_link_hash_table *htab;
1100 /* Get the section contents. */
1101 if (contents == NULL)
1103 if (elf_section_data (sec)->this_hdr.contents != NULL)
1104 contents = elf_section_data (sec)->this_hdr.contents;
1107 /* FIXME: How to better handle error condition? */
1108 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1111 /* Cache the section contents for elf_link_input_bfd. */
1112 elf_section_data (sec)->this_hdr.contents = contents;
1116 htab = elf_x86_64_hash_table (info);
1117 offset = rel->r_offset;
1120 case R_X86_64_TLSGD:
1121 case R_X86_64_TLSLD:
1122 if ((rel + 1) >= relend)
1125 if (r_type == R_X86_64_TLSGD)
1127 /* Check transition from GD access model. For 64bit, only
1128 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1129 .word 0x6666; rex64; call __tls_get_addr
1130 can transit to different access model. For 32bit, only
1131 leaq foo@tlsgd(%rip), %rdi
1132 .word 0x6666; rex64; call __tls_get_addr
1133 can transit to different access model. */
1135 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1136 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1138 if ((offset + 12) > sec->size
1139 || memcmp (contents + offset + 4, call, 4) != 0)
1142 if (ABI_64_P (abfd))
1145 || memcmp (contents + offset - 4, leaq, 4) != 0)
1151 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1157 /* Check transition from LD access model. Only
1158 leaq foo@tlsld(%rip), %rdi;
1160 can transit to different access model. */
1162 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1164 if (offset < 3 || (offset + 9) > sec->size)
1167 if (memcmp (contents + offset - 3, lea, 3) != 0
1168 || 0xe8 != *(contents + offset + 4))
1172 r_symndx = htab->r_sym (rel[1].r_info);
1173 if (r_symndx < symtab_hdr->sh_info)
1176 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1177 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1178 may be versioned. */
1180 && h->root.root.string != NULL
1181 && (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1182 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
1183 && (strncmp (h->root.root.string,
1184 "__tls_get_addr", 14) == 0));
1186 case R_X86_64_GOTTPOFF:
1187 /* Check transition from IE access model:
1188 mov foo@gottpoff(%rip), %reg
1189 add foo@gottpoff(%rip), %reg
1192 /* Check REX prefix first. */
1193 if (offset >= 3 && (offset + 4) <= sec->size)
1195 val = bfd_get_8 (abfd, contents + offset - 3);
1196 if (val != 0x48 && val != 0x4c)
1198 /* X32 may have 0x44 REX prefix or no REX prefix. */
1199 if (ABI_64_P (abfd))
1205 /* X32 may not have any REX prefix. */
1206 if (ABI_64_P (abfd))
1208 if (offset < 2 || (offset + 3) > sec->size)
1212 val = bfd_get_8 (abfd, contents + offset - 2);
1213 if (val != 0x8b && val != 0x03)
1216 val = bfd_get_8 (abfd, contents + offset - 1);
1217 return (val & 0xc7) == 5;
1219 case R_X86_64_GOTPC32_TLSDESC:
1220 /* Check transition from GDesc access model:
1221 leaq x@tlsdesc(%rip), %rax
1223 Make sure it's a leaq adding rip to a 32-bit offset
1224 into any register, although it's probably almost always
1227 if (offset < 3 || (offset + 4) > sec->size)
1230 val = bfd_get_8 (abfd, contents + offset - 3);
1231 if ((val & 0xfb) != 0x48)
1234 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1237 val = bfd_get_8 (abfd, contents + offset - 1);
1238 return (val & 0xc7) == 0x05;
1240 case R_X86_64_TLSDESC_CALL:
1241 /* Check transition from GDesc access model:
1242 call *x@tlsdesc(%rax)
1244 if (offset + 2 <= sec->size)
1246 /* Make sure that it's a call *x@tlsdesc(%rax). */
1247 static const unsigned char call[] = { 0xff, 0x10 };
1248 return memcmp (contents + offset, call, 2) == 0;
1258 /* Return TRUE if the TLS access transition is OK or no transition
1259 will be performed. Update R_TYPE if there is a transition. */
1262 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1263 asection *sec, bfd_byte *contents,
1264 Elf_Internal_Shdr *symtab_hdr,
1265 struct elf_link_hash_entry **sym_hashes,
1266 unsigned int *r_type, int tls_type,
1267 const Elf_Internal_Rela *rel,
1268 const Elf_Internal_Rela *relend,
1269 struct elf_link_hash_entry *h,
1270 unsigned long r_symndx)
1272 unsigned int from_type = *r_type;
1273 unsigned int to_type = from_type;
1274 bfd_boolean check = TRUE;
1276 /* Skip TLS transition for functions. */
1278 && (h->type == STT_FUNC
1279 || h->type == STT_GNU_IFUNC))
1284 case R_X86_64_TLSGD:
1285 case R_X86_64_GOTPC32_TLSDESC:
1286 case R_X86_64_TLSDESC_CALL:
1287 case R_X86_64_GOTTPOFF:
1288 if (info->executable)
1291 to_type = R_X86_64_TPOFF32;
1293 to_type = R_X86_64_GOTTPOFF;
1296 /* When we are called from elf_x86_64_relocate_section,
1297 CONTENTS isn't NULL and there may be additional transitions
1298 based on TLS_TYPE. */
1299 if (contents != NULL)
1301 unsigned int new_to_type = to_type;
1303 if (info->executable
1306 && tls_type == GOT_TLS_IE)
1307 new_to_type = R_X86_64_TPOFF32;
1309 if (to_type == R_X86_64_TLSGD
1310 || to_type == R_X86_64_GOTPC32_TLSDESC
1311 || to_type == R_X86_64_TLSDESC_CALL)
1313 if (tls_type == GOT_TLS_IE)
1314 new_to_type = R_X86_64_GOTTPOFF;
1317 /* We checked the transition before when we were called from
1318 elf_x86_64_check_relocs. We only want to check the new
1319 transition which hasn't been checked before. */
1320 check = new_to_type != to_type && from_type == to_type;
1321 to_type = new_to_type;
1326 case R_X86_64_TLSLD:
1327 if (info->executable)
1328 to_type = R_X86_64_TPOFF32;
1335 /* Return TRUE if there is no transition. */
1336 if (from_type == to_type)
1339 /* Check if the transition can be performed. */
1341 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1342 symtab_hdr, sym_hashes,
1343 from_type, rel, relend))
1345 reloc_howto_type *from, *to;
1348 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1349 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1352 name = h->root.root.string;
1355 struct elf_x86_64_link_hash_table *htab;
1357 htab = elf_x86_64_hash_table (info);
1362 Elf_Internal_Sym *isym;
1364 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1366 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1370 (*_bfd_error_handler)
1371 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1372 "in section `%A' failed"),
1373 abfd, sec, from->name, to->name, name,
1374 (unsigned long) rel->r_offset);
1375 bfd_set_error (bfd_error_bad_value);
1383 /* Look through the relocs for a section during the first phase, and
1384 calculate needed space in the global offset table, procedure
1385 linkage table, and dynamic reloc sections. */
1388 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1390 const Elf_Internal_Rela *relocs)
1392 struct elf_x86_64_link_hash_table *htab;
1393 Elf_Internal_Shdr *symtab_hdr;
1394 struct elf_link_hash_entry **sym_hashes;
1395 const Elf_Internal_Rela *rel;
1396 const Elf_Internal_Rela *rel_end;
1399 if (info->relocatable)
1402 BFD_ASSERT (is_x86_64_elf (abfd));
1404 htab = elf_x86_64_hash_table (info);
1408 symtab_hdr = &elf_symtab_hdr (abfd);
1409 sym_hashes = elf_sym_hashes (abfd);
1413 rel_end = relocs + sec->reloc_count;
1414 for (rel = relocs; rel < rel_end; rel++)
1416 unsigned int r_type;
1417 unsigned long r_symndx;
1418 struct elf_link_hash_entry *h;
1419 Elf_Internal_Sym *isym;
1422 r_symndx = htab->r_sym (rel->r_info);
1423 r_type = ELF32_R_TYPE (rel->r_info);
1425 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1427 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1432 if (r_symndx < symtab_hdr->sh_info)
1434 /* A local symbol. */
1435 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1440 /* Check relocation against local STT_GNU_IFUNC symbol. */
1441 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1443 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1448 /* Fake a STT_GNU_IFUNC symbol. */
1449 h->type = STT_GNU_IFUNC;
1452 h->forced_local = 1;
1453 h->root.type = bfd_link_hash_defined;
1461 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1462 while (h->root.type == bfd_link_hash_indirect
1463 || h->root.type == bfd_link_hash_warning)
1464 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1467 /* Check invalid x32 relocations. */
1468 if (!ABI_64_P (abfd))
1474 case R_X86_64_DTPOFF64:
1475 case R_X86_64_TPOFF64:
1477 case R_X86_64_GOTOFF64:
1478 case R_X86_64_GOT64:
1479 case R_X86_64_GOTPCREL64:
1480 case R_X86_64_GOTPC64:
1481 case R_X86_64_GOTPLT64:
1482 case R_X86_64_PLTOFF64:
1485 name = h->root.root.string;
1487 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1489 (*_bfd_error_handler)
1490 (_("%B: relocation %s against symbol `%s' isn't "
1491 "supported in x32 mode"), abfd,
1492 x86_64_elf_howto_table[r_type].name, name);
1493 bfd_set_error (bfd_error_bad_value);
1501 /* Create the ifunc sections for static executables. If we
1502 never see an indirect function symbol nor we are building
1503 a static executable, those sections will be empty and
1504 won't appear in output. */
1515 case R_X86_64_PLT32:
1516 case R_X86_64_GOTPCREL:
1517 case R_X86_64_GOTPCREL64:
1518 if (htab->elf.dynobj == NULL)
1519 htab->elf.dynobj = abfd;
1520 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1525 /* It is referenced by a non-shared object. */
1529 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1530 symtab_hdr, sym_hashes,
1531 &r_type, GOT_UNKNOWN,
1532 rel, rel_end, h, r_symndx))
1537 case R_X86_64_TLSLD:
1538 htab->tls_ld_got.refcount += 1;
1541 case R_X86_64_TPOFF32:
1542 if (!info->executable && ABI_64_P (abfd))
1545 name = h->root.root.string;
1547 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1549 (*_bfd_error_handler)
1550 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1552 x86_64_elf_howto_table[r_type].name, name);
1553 bfd_set_error (bfd_error_bad_value);
1558 case R_X86_64_GOTTPOFF:
1559 if (!info->executable)
1560 info->flags |= DF_STATIC_TLS;
1563 case R_X86_64_GOT32:
1564 case R_X86_64_GOTPCREL:
1565 case R_X86_64_TLSGD:
1566 case R_X86_64_GOT64:
1567 case R_X86_64_GOTPCREL64:
1568 case R_X86_64_GOTPLT64:
1569 case R_X86_64_GOTPC32_TLSDESC:
1570 case R_X86_64_TLSDESC_CALL:
1571 /* This symbol requires a global offset table entry. */
1573 int tls_type, old_tls_type;
1577 default: tls_type = GOT_NORMAL; break;
1578 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1579 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1580 case R_X86_64_GOTPC32_TLSDESC:
1581 case R_X86_64_TLSDESC_CALL:
1582 tls_type = GOT_TLS_GDESC; break;
1587 if (r_type == R_X86_64_GOTPLT64)
1589 /* This relocation indicates that we also need
1590 a PLT entry, as this is a function. We don't need
1591 a PLT entry for local symbols. */
1593 h->plt.refcount += 1;
1595 h->got.refcount += 1;
1596 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1600 bfd_signed_vma *local_got_refcounts;
1602 /* This is a global offset table entry for a local symbol. */
1603 local_got_refcounts = elf_local_got_refcounts (abfd);
1604 if (local_got_refcounts == NULL)
1608 size = symtab_hdr->sh_info;
1609 size *= sizeof (bfd_signed_vma)
1610 + sizeof (bfd_vma) + sizeof (char);
1611 local_got_refcounts = ((bfd_signed_vma *)
1612 bfd_zalloc (abfd, size));
1613 if (local_got_refcounts == NULL)
1615 elf_local_got_refcounts (abfd) = local_got_refcounts;
1616 elf_x86_64_local_tlsdesc_gotent (abfd)
1617 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1618 elf_x86_64_local_got_tls_type (abfd)
1619 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1621 local_got_refcounts[r_symndx] += 1;
1623 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1626 /* If a TLS symbol is accessed using IE at least once,
1627 there is no point to use dynamic model for it. */
1628 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1629 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1630 || tls_type != GOT_TLS_IE))
1632 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1633 tls_type = old_tls_type;
1634 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1635 && GOT_TLS_GD_ANY_P (tls_type))
1636 tls_type |= old_tls_type;
1640 name = h->root.root.string;
1642 name = bfd_elf_sym_name (abfd, symtab_hdr,
1644 (*_bfd_error_handler)
1645 (_("%B: '%s' accessed both as normal and thread local symbol"),
1651 if (old_tls_type != tls_type)
1654 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1656 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1661 case R_X86_64_GOTOFF64:
1662 case R_X86_64_GOTPC32:
1663 case R_X86_64_GOTPC64:
1665 if (htab->elf.sgot == NULL)
1667 if (htab->elf.dynobj == NULL)
1668 htab->elf.dynobj = abfd;
1669 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1675 case R_X86_64_PLT32:
1676 /* This symbol requires a procedure linkage table entry. We
1677 actually build the entry in adjust_dynamic_symbol,
1678 because this might be a case of linking PIC code which is
1679 never referenced by a dynamic object, in which case we
1680 don't need to generate a procedure linkage table entry
1683 /* If this is a local symbol, we resolve it directly without
1684 creating a procedure linkage table entry. */
1689 h->plt.refcount += 1;
1692 case R_X86_64_PLTOFF64:
1693 /* This tries to form the 'address' of a function relative
1694 to GOT. For global symbols we need a PLT entry. */
1698 h->plt.refcount += 1;
1703 if (!ABI_64_P (abfd))
1708 /* Let's help debug shared library creation. These relocs
1709 cannot be used in shared libs. Don't error out for
1710 sections we don't care about, such as debug sections or
1711 non-constant sections. */
1713 && (sec->flags & SEC_ALLOC) != 0
1714 && (sec->flags & SEC_READONLY) != 0)
1717 name = h->root.root.string;
1719 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1720 (*_bfd_error_handler)
1721 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1722 abfd, x86_64_elf_howto_table[r_type].name, name);
1723 bfd_set_error (bfd_error_bad_value);
1734 if (h != NULL && info->executable)
1736 /* If this reloc is in a read-only section, we might
1737 need a copy reloc. We can't check reliably at this
1738 stage whether the section is read-only, as input
1739 sections have not yet been mapped to output sections.
1740 Tentatively set the flag for now, and correct in
1741 adjust_dynamic_symbol. */
1744 /* We may need a .plt entry if the function this reloc
1745 refers to is in a shared lib. */
1746 h->plt.refcount += 1;
1747 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1748 h->pointer_equality_needed = 1;
1751 /* If we are creating a shared library, and this is a reloc
1752 against a global symbol, or a non PC relative reloc
1753 against a local symbol, then we need to copy the reloc
1754 into the shared library. However, if we are linking with
1755 -Bsymbolic, we do not need to copy a reloc against a
1756 global symbol which is defined in an object we are
1757 including in the link (i.e., DEF_REGULAR is set). At
1758 this point we have not seen all the input files, so it is
1759 possible that DEF_REGULAR is not set now but will be set
1760 later (it is never cleared). In case of a weak definition,
1761 DEF_REGULAR may be cleared later by a strong definition in
1762 a shared library. We account for that possibility below by
1763 storing information in the relocs_copied field of the hash
1764 table entry. A similar situation occurs when creating
1765 shared libraries and symbol visibility changes render the
1768 If on the other hand, we are creating an executable, we
1769 may need to keep relocations for symbols satisfied by a
1770 dynamic library if we manage to avoid copy relocs for the
1773 && (sec->flags & SEC_ALLOC) != 0
1774 && (! IS_X86_64_PCREL_TYPE (r_type)
1776 && (! SYMBOLIC_BIND (info, h)
1777 || h->root.type == bfd_link_hash_defweak
1778 || !h->def_regular))))
1779 || (ELIMINATE_COPY_RELOCS
1781 && (sec->flags & SEC_ALLOC) != 0
1783 && (h->root.type == bfd_link_hash_defweak
1784 || !h->def_regular)))
1786 struct elf_dyn_relocs *p;
1787 struct elf_dyn_relocs **head;
1789 /* We must copy these reloc types into the output file.
1790 Create a reloc section in dynobj and make room for
1794 if (htab->elf.dynobj == NULL)
1795 htab->elf.dynobj = abfd;
1797 sreloc = _bfd_elf_make_dynamic_reloc_section
1798 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1799 abfd, /*rela?*/ TRUE);
1805 /* If this is a global symbol, we count the number of
1806 relocations we need for this symbol. */
1809 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
1813 /* Track dynamic relocs needed for local syms too.
1814 We really need local syms available to do this
1819 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1824 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1828 /* Beware of type punned pointers vs strict aliasing
1830 vpp = &(elf_section_data (s)->local_dynrel);
1831 head = (struct elf_dyn_relocs **)vpp;
1835 if (p == NULL || p->sec != sec)
1837 bfd_size_type amt = sizeof *p;
1839 p = ((struct elf_dyn_relocs *)
1840 bfd_alloc (htab->elf.dynobj, amt));
1851 if (IS_X86_64_PCREL_TYPE (r_type))
1856 /* This relocation describes the C++ object vtable hierarchy.
1857 Reconstruct it for later use during GC. */
1858 case R_X86_64_GNU_VTINHERIT:
1859 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1863 /* This relocation describes which C++ vtable entries are actually
1864 used. Record for later use during GC. */
1865 case R_X86_64_GNU_VTENTRY:
1866 BFD_ASSERT (h != NULL);
1868 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1880 /* Return the section that should be marked against GC for a given
1884 elf_x86_64_gc_mark_hook (asection *sec,
1885 struct bfd_link_info *info,
1886 Elf_Internal_Rela *rel,
1887 struct elf_link_hash_entry *h,
1888 Elf_Internal_Sym *sym)
1891 switch (ELF32_R_TYPE (rel->r_info))
1893 case R_X86_64_GNU_VTINHERIT:
1894 case R_X86_64_GNU_VTENTRY:
1898 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1901 /* Update the got entry reference counts for the section being removed. */
1904 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1906 const Elf_Internal_Rela *relocs)
1908 struct elf_x86_64_link_hash_table *htab;
1909 Elf_Internal_Shdr *symtab_hdr;
1910 struct elf_link_hash_entry **sym_hashes;
1911 bfd_signed_vma *local_got_refcounts;
1912 const Elf_Internal_Rela *rel, *relend;
1914 if (info->relocatable)
1917 htab = elf_x86_64_hash_table (info);
1921 elf_section_data (sec)->local_dynrel = NULL;
1923 symtab_hdr = &elf_symtab_hdr (abfd);
1924 sym_hashes = elf_sym_hashes (abfd);
1925 local_got_refcounts = elf_local_got_refcounts (abfd);
1927 htab = elf_x86_64_hash_table (info);
1928 relend = relocs + sec->reloc_count;
1929 for (rel = relocs; rel < relend; rel++)
1931 unsigned long r_symndx;
1932 unsigned int r_type;
1933 struct elf_link_hash_entry *h = NULL;
1935 r_symndx = htab->r_sym (rel->r_info);
1936 if (r_symndx >= symtab_hdr->sh_info)
1938 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1939 while (h->root.type == bfd_link_hash_indirect
1940 || h->root.type == bfd_link_hash_warning)
1941 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1945 /* A local symbol. */
1946 Elf_Internal_Sym *isym;
1948 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1951 /* Check relocation against local STT_GNU_IFUNC symbol. */
1953 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1955 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
1963 struct elf_x86_64_link_hash_entry *eh;
1964 struct elf_dyn_relocs **pp;
1965 struct elf_dyn_relocs *p;
1967 eh = (struct elf_x86_64_link_hash_entry *) h;
1969 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1972 /* Everything must go for SEC. */
1978 r_type = ELF32_R_TYPE (rel->r_info);
1979 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1980 symtab_hdr, sym_hashes,
1981 &r_type, GOT_UNKNOWN,
1982 rel, relend, h, r_symndx))
1987 case R_X86_64_TLSLD:
1988 if (htab->tls_ld_got.refcount > 0)
1989 htab->tls_ld_got.refcount -= 1;
1992 case R_X86_64_TLSGD:
1993 case R_X86_64_GOTPC32_TLSDESC:
1994 case R_X86_64_TLSDESC_CALL:
1995 case R_X86_64_GOTTPOFF:
1996 case R_X86_64_GOT32:
1997 case R_X86_64_GOTPCREL:
1998 case R_X86_64_GOT64:
1999 case R_X86_64_GOTPCREL64:
2000 case R_X86_64_GOTPLT64:
2003 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
2004 h->plt.refcount -= 1;
2005 if (h->got.refcount > 0)
2006 h->got.refcount -= 1;
2007 if (h->type == STT_GNU_IFUNC)
2009 if (h->plt.refcount > 0)
2010 h->plt.refcount -= 1;
2013 else if (local_got_refcounts != NULL)
2015 if (local_got_refcounts[r_symndx] > 0)
2016 local_got_refcounts[r_symndx] -= 1;
2030 && (h == NULL || h->type != STT_GNU_IFUNC))
2034 case R_X86_64_PLT32:
2035 case R_X86_64_PLTOFF64:
2038 if (h->plt.refcount > 0)
2039 h->plt.refcount -= 1;
2051 /* Adjust a symbol defined by a dynamic object and referenced by a
2052 regular object. The current definition is in some section of the
2053 dynamic object, but we're not including those sections. We have to
2054 change the definition to something the rest of the link can
2058 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2059 struct elf_link_hash_entry *h)
2061 struct elf_x86_64_link_hash_table *htab;
2063 struct elf_x86_64_link_hash_entry *eh;
2064 struct elf_dyn_relocs *p;
2066 /* STT_GNU_IFUNC symbol must go through PLT. */
2067 if (h->type == STT_GNU_IFUNC)
2069 /* All local STT_GNU_IFUNC references must be treate as local
2070 calls via local PLT. */
2072 && SYMBOL_CALLS_LOCAL (info, h))
2074 bfd_size_type pc_count = 0, count = 0;
2075 struct elf_dyn_relocs **pp;
2077 eh = (struct elf_x86_64_link_hash_entry *) h;
2078 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2080 pc_count += p->pc_count;
2081 p->count -= p->pc_count;
2090 if (pc_count || count)
2093 h->plt.refcount += 1;
2098 if (h->plt.refcount <= 0)
2100 h->plt.offset = (bfd_vma) -1;
2106 /* If this is a function, put it in the procedure linkage table. We
2107 will fill in the contents of the procedure linkage table later,
2108 when we know the address of the .got section. */
2109 if (h->type == STT_FUNC
2112 if (h->plt.refcount <= 0
2113 || SYMBOL_CALLS_LOCAL (info, h)
2114 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2115 && h->root.type == bfd_link_hash_undefweak))
2117 /* This case can occur if we saw a PLT32 reloc in an input
2118 file, but the symbol was never referred to by a dynamic
2119 object, or if all references were garbage collected. In
2120 such a case, we don't actually need to build a procedure
2121 linkage table, and we can just do a PC32 reloc instead. */
2122 h->plt.offset = (bfd_vma) -1;
2129 /* It's possible that we incorrectly decided a .plt reloc was
2130 needed for an R_X86_64_PC32 reloc to a non-function sym in
2131 check_relocs. We can't decide accurately between function and
2132 non-function syms in check-relocs; Objects loaded later in
2133 the link may change h->type. So fix it now. */
2134 h->plt.offset = (bfd_vma) -1;
2136 /* If this is a weak symbol, and there is a real definition, the
2137 processor independent code will have arranged for us to see the
2138 real definition first, and we can just use the same value. */
2139 if (h->u.weakdef != NULL)
2141 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2142 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2143 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2144 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2145 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2146 h->non_got_ref = h->u.weakdef->non_got_ref;
2150 /* This is a reference to a symbol defined by a dynamic object which
2151 is not a function. */
2153 /* If we are creating a shared library, we must presume that the
2154 only references to the symbol are via the global offset table.
2155 For such cases we need not do anything here; the relocations will
2156 be handled correctly by relocate_section. */
2160 /* If there are no references to this symbol that do not use the
2161 GOT, we don't need to generate a copy reloc. */
2162 if (!h->non_got_ref)
2165 /* If -z nocopyreloc was given, we won't generate them either. */
2166 if (info->nocopyreloc)
2172 if (ELIMINATE_COPY_RELOCS)
2174 eh = (struct elf_x86_64_link_hash_entry *) h;
2175 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2177 s = p->sec->output_section;
2178 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2182 /* If we didn't find any dynamic relocs in read-only sections, then
2183 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2191 /* We must allocate the symbol in our .dynbss section, which will
2192 become part of the .bss section of the executable. There will be
2193 an entry for this symbol in the .dynsym section. The dynamic
2194 object will contain position independent code, so all references
2195 from the dynamic object to this symbol will go through the global
2196 offset table. The dynamic linker will use the .dynsym entry to
2197 determine the address it must put in the global offset table, so
2198 both the dynamic object and the regular object will refer to the
2199 same memory location for the variable. */
2201 htab = elf_x86_64_hash_table (info);
2205 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2206 to copy the initial value out of the dynamic object and into the
2207 runtime process image. */
2208 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2210 const struct elf_backend_data *bed;
2211 bed = get_elf_backend_data (info->output_bfd);
2212 htab->srelbss->size += bed->s->sizeof_rela;
2218 return _bfd_elf_adjust_dynamic_copy (h, s);
2221 /* Allocate space in .plt, .got and associated reloc sections for
2225 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2227 struct bfd_link_info *info;
2228 struct elf_x86_64_link_hash_table *htab;
2229 struct elf_x86_64_link_hash_entry *eh;
2230 struct elf_dyn_relocs *p;
2231 const struct elf_backend_data *bed;
2232 unsigned int plt_entry_size;
2234 if (h->root.type == bfd_link_hash_indirect)
2237 eh = (struct elf_x86_64_link_hash_entry *) h;
2239 info = (struct bfd_link_info *) inf;
2240 htab = elf_x86_64_hash_table (info);
2243 bed = get_elf_backend_data (info->output_bfd);
2244 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2246 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2247 here if it is defined and referenced in a non-shared object. */
2248 if (h->type == STT_GNU_IFUNC
2250 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2254 else if (htab->elf.dynamic_sections_created
2255 && h->plt.refcount > 0)
2257 /* Make sure this symbol is output as a dynamic symbol.
2258 Undefined weak syms won't yet be marked as dynamic. */
2259 if (h->dynindx == -1
2260 && !h->forced_local)
2262 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2267 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2269 asection *s = htab->elf.splt;
2271 /* If this is the first .plt entry, make room for the special
2274 s->size += plt_entry_size;
2276 h->plt.offset = s->size;
2278 /* If this symbol is not defined in a regular file, and we are
2279 not generating a shared library, then set the symbol to this
2280 location in the .plt. This is required to make function
2281 pointers compare as equal between the normal executable and
2282 the shared library. */
2286 h->root.u.def.section = s;
2287 h->root.u.def.value = h->plt.offset;
2290 /* Make room for this entry. */
2291 s->size += plt_entry_size;
2293 /* We also need to make an entry in the .got.plt section, which
2294 will be placed in the .got section by the linker script. */
2295 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2297 /* We also need to make an entry in the .rela.plt section. */
2298 htab->elf.srelplt->size += bed->s->sizeof_rela;
2299 htab->elf.srelplt->reloc_count++;
2303 h->plt.offset = (bfd_vma) -1;
2309 h->plt.offset = (bfd_vma) -1;
2313 eh->tlsdesc_got = (bfd_vma) -1;
2315 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2316 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2317 if (h->got.refcount > 0
2320 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2322 h->got.offset = (bfd_vma) -1;
2324 else if (h->got.refcount > 0)
2328 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2330 /* Make sure this symbol is output as a dynamic symbol.
2331 Undefined weak syms won't yet be marked as dynamic. */
2332 if (h->dynindx == -1
2333 && !h->forced_local)
2335 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2339 if (GOT_TLS_GDESC_P (tls_type))
2341 eh->tlsdesc_got = htab->elf.sgotplt->size
2342 - elf_x86_64_compute_jump_table_size (htab);
2343 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2344 h->got.offset = (bfd_vma) -2;
2346 if (! GOT_TLS_GDESC_P (tls_type)
2347 || GOT_TLS_GD_P (tls_type))
2350 h->got.offset = s->size;
2351 s->size += GOT_ENTRY_SIZE;
2352 if (GOT_TLS_GD_P (tls_type))
2353 s->size += GOT_ENTRY_SIZE;
2355 dyn = htab->elf.dynamic_sections_created;
2356 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2358 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2359 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2360 || tls_type == GOT_TLS_IE)
2361 htab->elf.srelgot->size += bed->s->sizeof_rela;
2362 else if (GOT_TLS_GD_P (tls_type))
2363 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2364 else if (! GOT_TLS_GDESC_P (tls_type)
2365 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2366 || h->root.type != bfd_link_hash_undefweak)
2368 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2369 htab->elf.srelgot->size += bed->s->sizeof_rela;
2370 if (GOT_TLS_GDESC_P (tls_type))
2372 htab->elf.srelplt->size += bed->s->sizeof_rela;
2373 htab->tlsdesc_plt = (bfd_vma) -1;
2377 h->got.offset = (bfd_vma) -1;
2379 if (eh->dyn_relocs == NULL)
2382 /* In the shared -Bsymbolic case, discard space allocated for
2383 dynamic pc-relative relocs against symbols which turn out to be
2384 defined in regular objects. For the normal shared case, discard
2385 space for pc-relative relocs that have become local due to symbol
2386 visibility changes. */
2390 /* Relocs that use pc_count are those that appear on a call
2391 insn, or certain REL relocs that can generated via assembly.
2392 We want calls to protected symbols to resolve directly to the
2393 function rather than going via the plt. If people want
2394 function pointer comparisons to work as expected then they
2395 should avoid writing weird assembly. */
2396 if (SYMBOL_CALLS_LOCAL (info, h))
2398 struct elf_dyn_relocs **pp;
2400 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2402 p->count -= p->pc_count;
2411 /* Also discard relocs on undefined weak syms with non-default
2413 if (eh->dyn_relocs != NULL
2414 && h->root.type == bfd_link_hash_undefweak)
2416 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2417 eh->dyn_relocs = NULL;
2419 /* Make sure undefined weak symbols are output as a dynamic
2421 else if (h->dynindx == -1
2422 && ! h->forced_local
2423 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2428 else if (ELIMINATE_COPY_RELOCS)
2430 /* For the non-shared case, discard space for relocs against
2431 symbols which turn out to need copy relocs or are not
2437 || (htab->elf.dynamic_sections_created
2438 && (h->root.type == bfd_link_hash_undefweak
2439 || h->root.type == bfd_link_hash_undefined))))
2441 /* Make sure this symbol is output as a dynamic symbol.
2442 Undefined weak syms won't yet be marked as dynamic. */
2443 if (h->dynindx == -1
2444 && ! h->forced_local
2445 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2448 /* If that succeeded, we know we'll be keeping all the
2450 if (h->dynindx != -1)
2454 eh->dyn_relocs = NULL;
2459 /* Finally, allocate space. */
2460 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2464 sreloc = elf_section_data (p->sec)->sreloc;
2466 BFD_ASSERT (sreloc != NULL);
2468 sreloc->size += p->count * bed->s->sizeof_rela;
2474 /* Allocate space in .plt, .got and associated reloc sections for
2475 local dynamic relocs. */
2478 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2480 struct elf_link_hash_entry *h
2481 = (struct elf_link_hash_entry *) *slot;
2483 if (h->type != STT_GNU_IFUNC
2487 || h->root.type != bfd_link_hash_defined)
2490 return elf_x86_64_allocate_dynrelocs (h, inf);
2493 /* Find any dynamic relocs that apply to read-only sections. */
2496 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2499 struct elf_x86_64_link_hash_entry *eh;
2500 struct elf_dyn_relocs *p;
2502 /* Skip local IFUNC symbols. */
2503 if (h->forced_local && h->type == STT_GNU_IFUNC)
2506 eh = (struct elf_x86_64_link_hash_entry *) h;
2507 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2509 asection *s = p->sec->output_section;
2511 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2513 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2515 info->flags |= DF_TEXTREL;
2517 if (info->warn_shared_textrel && info->shared)
2518 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2519 p->sec->owner, h->root.root.string,
2522 /* Not an error, just cut short the traversal. */
2530 mov foo@GOTPCREL(%rip), %reg
2533 with the local symbol, foo. */
2536 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2537 struct bfd_link_info *link_info)
2539 Elf_Internal_Shdr *symtab_hdr;
2540 Elf_Internal_Rela *internal_relocs;
2541 Elf_Internal_Rela *irel, *irelend;
2543 struct elf_x86_64_link_hash_table *htab;
2544 bfd_boolean changed_contents;
2545 bfd_boolean changed_relocs;
2546 bfd_signed_vma *local_got_refcounts;
2548 /* Don't even try to convert non-ELF outputs. */
2549 if (!is_elf_hash_table (link_info->hash))
2552 /* Nothing to do if there are no codes, no relocations or no output. */
2553 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2554 || sec->reloc_count == 0
2555 || discarded_section (sec))
2558 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2560 /* Load the relocations for this section. */
2561 internal_relocs = (_bfd_elf_link_read_relocs
2562 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2563 link_info->keep_memory));
2564 if (internal_relocs == NULL)
2567 htab = elf_x86_64_hash_table (link_info);
2568 changed_contents = FALSE;
2569 changed_relocs = FALSE;
2570 local_got_refcounts = elf_local_got_refcounts (abfd);
2572 /* Get the section contents. */
2573 if (elf_section_data (sec)->this_hdr.contents != NULL)
2574 contents = elf_section_data (sec)->this_hdr.contents;
2577 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2581 irelend = internal_relocs + sec->reloc_count;
2582 for (irel = internal_relocs; irel < irelend; irel++)
2584 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2585 unsigned int r_symndx = htab->r_sym (irel->r_info);
2587 struct elf_link_hash_entry *h;
2589 if (r_type != R_X86_64_GOTPCREL)
2592 /* Get the symbol referred to by the reloc. */
2593 if (r_symndx < symtab_hdr->sh_info)
2595 Elf_Internal_Sym *isym;
2597 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2600 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2601 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2602 && bfd_get_8 (input_bfd,
2603 contents + irel->r_offset - 2) == 0x8b)
2605 bfd_put_8 (output_bfd, 0x8d,
2606 contents + irel->r_offset - 2);
2607 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2608 if (local_got_refcounts != NULL
2609 && local_got_refcounts[r_symndx] > 0)
2610 local_got_refcounts[r_symndx] -= 1;
2611 changed_contents = TRUE;
2612 changed_relocs = TRUE;
2617 indx = r_symndx - symtab_hdr->sh_info;
2618 h = elf_sym_hashes (abfd)[indx];
2619 BFD_ASSERT (h != NULL);
2621 while (h->root.type == bfd_link_hash_indirect
2622 || h->root.type == bfd_link_hash_warning)
2623 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2625 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2626 avoid optimizing _DYNAMIC since ld.so may use its link-time
2629 && h->type != STT_GNU_IFUNC
2630 && h != htab->elf.hdynamic
2631 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2632 && bfd_get_8 (input_bfd,
2633 contents + irel->r_offset - 2) == 0x8b)
2635 bfd_put_8 (output_bfd, 0x8d,
2636 contents + irel->r_offset - 2);
2637 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2638 if (h->got.refcount > 0)
2639 h->got.refcount -= 1;
2640 changed_contents = TRUE;
2641 changed_relocs = TRUE;
2645 if (contents != NULL
2646 && elf_section_data (sec)->this_hdr.contents != contents)
2648 if (!changed_contents && !link_info->keep_memory)
2652 /* Cache the section contents for elf_link_input_bfd. */
2653 elf_section_data (sec)->this_hdr.contents = contents;
2657 if (elf_section_data (sec)->relocs != internal_relocs)
2659 if (!changed_relocs)
2660 free (internal_relocs);
2662 elf_section_data (sec)->relocs = internal_relocs;
2668 if (contents != NULL
2669 && elf_section_data (sec)->this_hdr.contents != contents)
2671 if (internal_relocs != NULL
2672 && elf_section_data (sec)->relocs != internal_relocs)
2673 free (internal_relocs);
2677 /* Set the sizes of the dynamic sections. */
2680 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2681 struct bfd_link_info *info)
2683 struct elf_x86_64_link_hash_table *htab;
2688 const struct elf_backend_data *bed;
2690 htab = elf_x86_64_hash_table (info);
2693 bed = get_elf_backend_data (output_bfd);
2695 dynobj = htab->elf.dynobj;
2699 if (htab->elf.dynamic_sections_created)
2701 /* Set the contents of the .interp section to the interpreter. */
2702 if (info->executable)
2704 s = bfd_get_linker_section (dynobj, ".interp");
2707 s->size = htab->dynamic_interpreter_size;
2708 s->contents = (unsigned char *) htab->dynamic_interpreter;
2712 /* Set up .got offsets for local syms, and space for local dynamic
2714 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2716 bfd_signed_vma *local_got;
2717 bfd_signed_vma *end_local_got;
2718 char *local_tls_type;
2719 bfd_vma *local_tlsdesc_gotent;
2720 bfd_size_type locsymcount;
2721 Elf_Internal_Shdr *symtab_hdr;
2724 if (! is_x86_64_elf (ibfd))
2727 for (s = ibfd->sections; s != NULL; s = s->next)
2729 struct elf_dyn_relocs *p;
2731 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
2734 for (p = (struct elf_dyn_relocs *)
2735 (elf_section_data (s)->local_dynrel);
2739 if (!bfd_is_abs_section (p->sec)
2740 && bfd_is_abs_section (p->sec->output_section))
2742 /* Input section has been discarded, either because
2743 it is a copy of a linkonce section or due to
2744 linker script /DISCARD/, so we'll be discarding
2747 else if (p->count != 0)
2749 srel = elf_section_data (p->sec)->sreloc;
2750 srel->size += p->count * bed->s->sizeof_rela;
2751 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2752 && (info->flags & DF_TEXTREL) == 0)
2754 info->flags |= DF_TEXTREL;
2755 if (info->warn_shared_textrel && info->shared)
2756 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2757 p->sec->owner, p->sec);
2763 local_got = elf_local_got_refcounts (ibfd);
2767 symtab_hdr = &elf_symtab_hdr (ibfd);
2768 locsymcount = symtab_hdr->sh_info;
2769 end_local_got = local_got + locsymcount;
2770 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
2771 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
2773 srel = htab->elf.srelgot;
2774 for (; local_got < end_local_got;
2775 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2777 *local_tlsdesc_gotent = (bfd_vma) -1;
2780 if (GOT_TLS_GDESC_P (*local_tls_type))
2782 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2783 - elf_x86_64_compute_jump_table_size (htab);
2784 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2785 *local_got = (bfd_vma) -2;
2787 if (! GOT_TLS_GDESC_P (*local_tls_type)
2788 || GOT_TLS_GD_P (*local_tls_type))
2790 *local_got = s->size;
2791 s->size += GOT_ENTRY_SIZE;
2792 if (GOT_TLS_GD_P (*local_tls_type))
2793 s->size += GOT_ENTRY_SIZE;
2796 || GOT_TLS_GD_ANY_P (*local_tls_type)
2797 || *local_tls_type == GOT_TLS_IE)
2799 if (GOT_TLS_GDESC_P (*local_tls_type))
2801 htab->elf.srelplt->size
2802 += bed->s->sizeof_rela;
2803 htab->tlsdesc_plt = (bfd_vma) -1;
2805 if (! GOT_TLS_GDESC_P (*local_tls_type)
2806 || GOT_TLS_GD_P (*local_tls_type))
2807 srel->size += bed->s->sizeof_rela;
2811 *local_got = (bfd_vma) -1;
2815 if (htab->tls_ld_got.refcount > 0)
2817 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2819 htab->tls_ld_got.offset = htab->elf.sgot->size;
2820 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2821 htab->elf.srelgot->size += bed->s->sizeof_rela;
2824 htab->tls_ld_got.offset = -1;
2826 /* Allocate global sym .plt and .got entries, and space for global
2827 sym dynamic relocs. */
2828 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
2831 /* Allocate .plt and .got entries, and space for local symbols. */
2832 htab_traverse (htab->loc_hash_table,
2833 elf_x86_64_allocate_local_dynrelocs,
2836 /* For every jump slot reserved in the sgotplt, reloc_count is
2837 incremented. However, when we reserve space for TLS descriptors,
2838 it's not incremented, so in order to compute the space reserved
2839 for them, it suffices to multiply the reloc count by the jump
2842 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2843 so that R_X86_64_IRELATIVE entries come last. */
2844 if (htab->elf.srelplt)
2846 htab->sgotplt_jump_table_size
2847 = elf_x86_64_compute_jump_table_size (htab);
2848 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2850 else if (htab->elf.irelplt)
2851 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2853 if (htab->tlsdesc_plt)
2855 /* If we're not using lazy TLS relocations, don't generate the
2856 PLT and GOT entries they require. */
2857 if ((info->flags & DF_BIND_NOW))
2858 htab->tlsdesc_plt = 0;
2861 htab->tlsdesc_got = htab->elf.sgot->size;
2862 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2863 /* Reserve room for the initial entry.
2864 FIXME: we could probably do away with it in this case. */
2865 if (htab->elf.splt->size == 0)
2866 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2867 htab->tlsdesc_plt = htab->elf.splt->size;
2868 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2872 if (htab->elf.sgotplt)
2874 /* Don't allocate .got.plt section if there are no GOT nor PLT
2875 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2876 if ((htab->elf.hgot == NULL
2877 || !htab->elf.hgot->ref_regular_nonweak)
2878 && (htab->elf.sgotplt->size
2879 == get_elf_backend_data (output_bfd)->got_header_size)
2880 && (htab->elf.splt == NULL
2881 || htab->elf.splt->size == 0)
2882 && (htab->elf.sgot == NULL
2883 || htab->elf.sgot->size == 0)
2884 && (htab->elf.iplt == NULL
2885 || htab->elf.iplt->size == 0)
2886 && (htab->elf.igotplt == NULL
2887 || htab->elf.igotplt->size == 0))
2888 htab->elf.sgotplt->size = 0;
2891 if (htab->plt_eh_frame != NULL
2892 && htab->elf.splt != NULL
2893 && htab->elf.splt->size != 0
2894 && !bfd_is_abs_section (htab->elf.splt->output_section)
2895 && _bfd_elf_eh_frame_present (info))
2897 const struct elf_x86_64_backend_data *arch_data
2898 = (const struct elf_x86_64_backend_data *) bed->arch_data;
2899 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
2902 /* We now have determined the sizes of the various dynamic sections.
2903 Allocate memory for them. */
2905 for (s = dynobj->sections; s != NULL; s = s->next)
2907 if ((s->flags & SEC_LINKER_CREATED) == 0)
2910 if (s == htab->elf.splt
2911 || s == htab->elf.sgot
2912 || s == htab->elf.sgotplt
2913 || s == htab->elf.iplt
2914 || s == htab->elf.igotplt
2915 || s == htab->plt_eh_frame
2916 || s == htab->sdynbss)
2918 /* Strip this section if we don't need it; see the
2921 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2923 if (s->size != 0 && s != htab->elf.srelplt)
2926 /* We use the reloc_count field as a counter if we need
2927 to copy relocs into the output file. */
2928 if (s != htab->elf.srelplt)
2933 /* It's not one of our sections, so don't allocate space. */
2939 /* If we don't need this section, strip it from the
2940 output file. This is mostly to handle .rela.bss and
2941 .rela.plt. We must create both sections in
2942 create_dynamic_sections, because they must be created
2943 before the linker maps input sections to output
2944 sections. The linker does that before
2945 adjust_dynamic_symbol is called, and it is that
2946 function which decides whether anything needs to go
2947 into these sections. */
2949 s->flags |= SEC_EXCLUDE;
2953 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2956 /* Allocate memory for the section contents. We use bfd_zalloc
2957 here in case unused entries are not reclaimed before the
2958 section's contents are written out. This should not happen,
2959 but this way if it does, we get a R_X86_64_NONE reloc instead
2961 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2962 if (s->contents == NULL)
2966 if (htab->plt_eh_frame != NULL
2967 && htab->plt_eh_frame->contents != NULL)
2969 const struct elf_x86_64_backend_data *arch_data
2970 = (const struct elf_x86_64_backend_data *) bed->arch_data;
2972 memcpy (htab->plt_eh_frame->contents,
2973 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
2974 bfd_put_32 (dynobj, htab->elf.splt->size,
2975 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2978 if (htab->elf.dynamic_sections_created)
2980 /* Add some entries to the .dynamic section. We fill in the
2981 values later, in elf_x86_64_finish_dynamic_sections, but we
2982 must add the entries now so that we get the correct size for
2983 the .dynamic section. The DT_DEBUG entry is filled in by the
2984 dynamic linker and used by the debugger. */
2985 #define add_dynamic_entry(TAG, VAL) \
2986 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2988 if (info->executable)
2990 if (!add_dynamic_entry (DT_DEBUG, 0))
2994 if (htab->elf.splt->size != 0)
2996 if (!add_dynamic_entry (DT_PLTGOT, 0)
2997 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2998 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2999 || !add_dynamic_entry (DT_JMPREL, 0))
3002 if (htab->tlsdesc_plt
3003 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3004 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3010 if (!add_dynamic_entry (DT_RELA, 0)
3011 || !add_dynamic_entry (DT_RELASZ, 0)
3012 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3015 /* If any dynamic relocs apply to a read-only section,
3016 then we need a DT_TEXTREL entry. */
3017 if ((info->flags & DF_TEXTREL) == 0)
3018 elf_link_hash_traverse (&htab->elf,
3019 elf_x86_64_readonly_dynrelocs,
3022 if ((info->flags & DF_TEXTREL) != 0)
3024 if (!add_dynamic_entry (DT_TEXTREL, 0))
3029 #undef add_dynamic_entry
3035 elf_x86_64_always_size_sections (bfd *output_bfd,
3036 struct bfd_link_info *info)
3038 asection *tls_sec = elf_hash_table (info)->tls_sec;
3042 struct elf_link_hash_entry *tlsbase;
3044 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3045 "_TLS_MODULE_BASE_",
3046 FALSE, FALSE, FALSE);
3048 if (tlsbase && tlsbase->type == STT_TLS)
3050 struct elf_x86_64_link_hash_table *htab;
3051 struct bfd_link_hash_entry *bh = NULL;
3052 const struct elf_backend_data *bed
3053 = get_elf_backend_data (output_bfd);
3055 htab = elf_x86_64_hash_table (info);
3059 if (!(_bfd_generic_link_add_one_symbol
3060 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3061 tls_sec, 0, NULL, FALSE,
3062 bed->collect, &bh)))
3065 htab->tls_module_base = bh;
3067 tlsbase = (struct elf_link_hash_entry *)bh;
3068 tlsbase->def_regular = 1;
3069 tlsbase->other = STV_HIDDEN;
3070 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3077 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3078 executables. Rather than setting it to the beginning of the TLS
3079 section, we have to set it to the end. This function may be called
3080 multiple times, it is idempotent. */
3083 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3085 struct elf_x86_64_link_hash_table *htab;
3086 struct bfd_link_hash_entry *base;
3088 if (!info->executable)
3091 htab = elf_x86_64_hash_table (info);
3095 base = htab->tls_module_base;
3099 base->u.def.value = htab->elf.tls_size;
3102 /* Return the base VMA address which should be subtracted from real addresses
3103 when resolving @dtpoff relocation.
3104 This is PT_TLS segment p_vaddr. */
3107 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3109 /* If tls_sec is NULL, we should have signalled an error already. */
3110 if (elf_hash_table (info)->tls_sec == NULL)
3112 return elf_hash_table (info)->tls_sec->vma;
3115 /* Return the relocation value for @tpoff relocation
3116 if STT_TLS virtual address is ADDRESS. */
3119 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3121 struct elf_link_hash_table *htab = elf_hash_table (info);
3122 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3123 bfd_vma static_tls_size;
3125 /* If tls_segment is NULL, we should have signalled an error already. */
3126 if (htab->tls_sec == NULL)
3129 /* Consider special static TLS alignment requirements. */
3130 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3131 return address - static_tls_size - htab->tls_sec->vma;
3134 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3138 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3140 /* Opcode Instruction
3143 0x0f 0x8x conditional jump */
3145 && (contents [offset - 1] == 0xe8
3146 || contents [offset - 1] == 0xe9))
3148 && contents [offset - 2] == 0x0f
3149 && (contents [offset - 1] & 0xf0) == 0x80));
3152 /* Relocate an x86_64 ELF section. */
3155 elf_x86_64_relocate_section (bfd *output_bfd,
3156 struct bfd_link_info *info,
3158 asection *input_section,
3160 Elf_Internal_Rela *relocs,
3161 Elf_Internal_Sym *local_syms,
3162 asection **local_sections)
3164 struct elf_x86_64_link_hash_table *htab;
3165 Elf_Internal_Shdr *symtab_hdr;
3166 struct elf_link_hash_entry **sym_hashes;
3167 bfd_vma *local_got_offsets;
3168 bfd_vma *local_tlsdesc_gotents;
3169 Elf_Internal_Rela *rel;
3170 Elf_Internal_Rela *relend;
3171 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3173 BFD_ASSERT (is_x86_64_elf (input_bfd));
3175 htab = elf_x86_64_hash_table (info);
3178 symtab_hdr = &elf_symtab_hdr (input_bfd);
3179 sym_hashes = elf_sym_hashes (input_bfd);
3180 local_got_offsets = elf_local_got_offsets (input_bfd);
3181 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3183 elf_x86_64_set_tls_module_base (info);
3186 relend = relocs + input_section->reloc_count;
3187 for (; rel < relend; rel++)
3189 unsigned int r_type;
3190 reloc_howto_type *howto;
3191 unsigned long r_symndx;
3192 struct elf_link_hash_entry *h;
3193 Elf_Internal_Sym *sym;
3195 bfd_vma off, offplt;
3197 bfd_boolean unresolved_reloc;
3198 bfd_reloc_status_type r;
3202 r_type = ELF32_R_TYPE (rel->r_info);
3203 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3204 || r_type == (int) R_X86_64_GNU_VTENTRY)
3207 if (r_type >= R_X86_64_max)
3209 bfd_set_error (bfd_error_bad_value);
3213 if (r_type != (int) R_X86_64_32
3214 || ABI_64_P (output_bfd))
3215 howto = x86_64_elf_howto_table + r_type;
3217 howto = (x86_64_elf_howto_table
3218 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3219 r_symndx = htab->r_sym (rel->r_info);
3223 unresolved_reloc = FALSE;
3224 if (r_symndx < symtab_hdr->sh_info)
3226 sym = local_syms + r_symndx;
3227 sec = local_sections[r_symndx];
3229 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3232 /* Relocate against local STT_GNU_IFUNC symbol. */
3233 if (!info->relocatable
3234 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3236 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3241 /* Set STT_GNU_IFUNC symbol value. */
3242 h->root.u.def.value = sym->st_value;
3243 h->root.u.def.section = sec;
3248 bfd_boolean warned ATTRIBUTE_UNUSED;
3250 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3251 r_symndx, symtab_hdr, sym_hashes,
3253 unresolved_reloc, warned);
3256 if (sec != NULL && discarded_section (sec))
3257 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3258 rel, 1, relend, howto, 0, contents);
3260 if (info->relocatable)
3263 if (rel->r_addend == 0
3264 && r_type == R_X86_64_64
3265 && !ABI_64_P (output_bfd))
3267 /* For x32, treat R_X86_64_64 like R_X86_64_32 and zero-extend
3268 it to 64bit if addend is zero. */
3269 r_type = R_X86_64_32;
3270 memset (contents + rel->r_offset + 4, 0, 4);
3273 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3274 it here if it is defined in a non-shared object. */
3276 && h->type == STT_GNU_IFUNC
3283 if ((input_section->flags & SEC_ALLOC) == 0
3284 || h->plt.offset == (bfd_vma) -1)
3287 /* STT_GNU_IFUNC symbol must go through PLT. */
3288 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3289 relocation = (plt->output_section->vma
3290 + plt->output_offset + h->plt.offset);
3295 if (h->root.root.string)
3296 name = h->root.root.string;
3298 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3300 (*_bfd_error_handler)
3301 (_("%B: relocation %s against STT_GNU_IFUNC "
3302 "symbol `%s' isn't handled by %s"), input_bfd,
3303 x86_64_elf_howto_table[r_type].name,
3304 name, __FUNCTION__);
3305 bfd_set_error (bfd_error_bad_value);
3314 if (ABI_64_P (output_bfd))
3318 if (rel->r_addend != 0)
3320 if (h->root.root.string)
3321 name = h->root.root.string;
3323 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3325 (*_bfd_error_handler)
3326 (_("%B: relocation %s against STT_GNU_IFUNC "
3327 "symbol `%s' has non-zero addend: %d"),
3328 input_bfd, x86_64_elf_howto_table[r_type].name,
3329 name, rel->r_addend);
3330 bfd_set_error (bfd_error_bad_value);
3334 /* Generate dynamic relcoation only when there is a
3335 non-GOT reference in a shared object. */
3336 if (info->shared && h->non_got_ref)
3338 Elf_Internal_Rela outrel;
3341 /* Need a dynamic relocation to get the real function
3343 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3347 if (outrel.r_offset == (bfd_vma) -1
3348 || outrel.r_offset == (bfd_vma) -2)
3351 outrel.r_offset += (input_section->output_section->vma
3352 + input_section->output_offset);
3354 if (h->dynindx == -1
3356 || info->executable)
3358 /* This symbol is resolved locally. */
3359 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3360 outrel.r_addend = (h->root.u.def.value
3361 + h->root.u.def.section->output_section->vma
3362 + h->root.u.def.section->output_offset);
3366 outrel.r_info = htab->r_info (h->dynindx, r_type);
3367 outrel.r_addend = 0;
3370 sreloc = htab->elf.irelifunc;
3371 elf_append_rela (output_bfd, sreloc, &outrel);
3373 /* If this reloc is against an external symbol, we
3374 do not want to fiddle with the addend. Otherwise,
3375 we need to include the symbol value so that it
3376 becomes an addend for the dynamic reloc. For an
3377 internal symbol, we have updated addend. */
3383 case R_X86_64_PLT32:
3386 case R_X86_64_GOTPCREL:
3387 case R_X86_64_GOTPCREL64:
3388 base_got = htab->elf.sgot;
3389 off = h->got.offset;
3391 if (base_got == NULL)
3394 if (off == (bfd_vma) -1)
3396 /* We can't use h->got.offset here to save state, or
3397 even just remember the offset, as finish_dynamic_symbol
3398 would use that as offset into .got. */
3400 if (htab->elf.splt != NULL)
3402 plt_index = h->plt.offset / plt_entry_size - 1;
3403 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3404 base_got = htab->elf.sgotplt;
3408 plt_index = h->plt.offset / plt_entry_size;
3409 off = plt_index * GOT_ENTRY_SIZE;
3410 base_got = htab->elf.igotplt;
3413 if (h->dynindx == -1
3417 /* This references the local defitionion. We must
3418 initialize this entry in the global offset table.
3419 Since the offset must always be a multiple of 8,
3420 we use the least significant bit to record
3421 whether we have initialized it already.
3423 When doing a dynamic link, we create a .rela.got
3424 relocation entry to initialize the value. This
3425 is done in the finish_dynamic_symbol routine. */
3430 bfd_put_64 (output_bfd, relocation,
3431 base_got->contents + off);
3432 /* Note that this is harmless for the GOTPLT64
3433 case, as -1 | 1 still is -1. */
3439 relocation = (base_got->output_section->vma
3440 + base_got->output_offset + off);
3446 /* When generating a shared object, the relocations handled here are
3447 copied into the output file to be resolved at run time. */
3450 case R_X86_64_GOT32:
3451 case R_X86_64_GOT64:
3452 /* Relocation is to the entry for this symbol in the global
3454 case R_X86_64_GOTPCREL:
3455 case R_X86_64_GOTPCREL64:
3456 /* Use global offset table entry as symbol value. */
3457 case R_X86_64_GOTPLT64:
3458 /* This is the same as GOT64 for relocation purposes, but
3459 indicates the existence of a PLT entry. The difficulty is,
3460 that we must calculate the GOT slot offset from the PLT
3461 offset, if this symbol got a PLT entry (it was global).
3462 Additionally if it's computed from the PLT entry, then that
3463 GOT offset is relative to .got.plt, not to .got. */
3464 base_got = htab->elf.sgot;
3466 if (htab->elf.sgot == NULL)
3473 off = h->got.offset;
3475 && h->plt.offset != (bfd_vma)-1
3476 && off == (bfd_vma)-1)
3478 /* We can't use h->got.offset here to save
3479 state, or even just remember the offset, as
3480 finish_dynamic_symbol would use that as offset into
3482 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3483 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3484 base_got = htab->elf.sgotplt;
3487 dyn = htab->elf.dynamic_sections_created;
3489 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3491 && SYMBOL_REFERENCES_LOCAL (info, h))
3492 || (ELF_ST_VISIBILITY (h->other)
3493 && h->root.type == bfd_link_hash_undefweak))
3495 /* This is actually a static link, or it is a -Bsymbolic
3496 link and the symbol is defined locally, or the symbol
3497 was forced to be local because of a version file. We
3498 must initialize this entry in the global offset table.
3499 Since the offset must always be a multiple of 8, we
3500 use the least significant bit to record whether we
3501 have initialized it already.
3503 When doing a dynamic link, we create a .rela.got
3504 relocation entry to initialize the value. This is
3505 done in the finish_dynamic_symbol routine. */
3510 bfd_put_64 (output_bfd, relocation,
3511 base_got->contents + off);
3512 /* Note that this is harmless for the GOTPLT64 case,
3513 as -1 | 1 still is -1. */
3518 unresolved_reloc = FALSE;
3522 if (local_got_offsets == NULL)
3525 off = local_got_offsets[r_symndx];
3527 /* The offset must always be a multiple of 8. We use
3528 the least significant bit to record whether we have
3529 already generated the necessary reloc. */
3534 bfd_put_64 (output_bfd, relocation,
3535 base_got->contents + off);
3540 Elf_Internal_Rela outrel;
3542 /* We need to generate a R_X86_64_RELATIVE reloc
3543 for the dynamic linker. */
3544 s = htab->elf.srelgot;
3548 outrel.r_offset = (base_got->output_section->vma
3549 + base_got->output_offset
3551 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3552 outrel.r_addend = relocation;
3553 elf_append_rela (output_bfd, s, &outrel);
3556 local_got_offsets[r_symndx] |= 1;
3560 if (off >= (bfd_vma) -2)
3563 relocation = base_got->output_section->vma
3564 + base_got->output_offset + off;
3565 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3566 relocation -= htab->elf.sgotplt->output_section->vma
3567 - htab->elf.sgotplt->output_offset;
3571 case R_X86_64_GOTOFF64:
3572 /* Relocation is relative to the start of the global offset
3575 /* Check to make sure it isn't a protected function symbol
3576 for shared library since it may not be local when used
3577 as function address. */
3578 if (!info->executable
3580 && !SYMBOLIC_BIND (info, h)
3582 && h->type == STT_FUNC
3583 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3585 (*_bfd_error_handler)
3586 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3587 input_bfd, h->root.root.string);
3588 bfd_set_error (bfd_error_bad_value);
3592 /* Note that sgot is not involved in this
3593 calculation. We always want the start of .got.plt. If we
3594 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3595 permitted by the ABI, we might have to change this
3597 relocation -= htab->elf.sgotplt->output_section->vma
3598 + htab->elf.sgotplt->output_offset;
3601 case R_X86_64_GOTPC32:
3602 case R_X86_64_GOTPC64:
3603 /* Use global offset table as symbol value. */
3604 relocation = htab->elf.sgotplt->output_section->vma
3605 + htab->elf.sgotplt->output_offset;
3606 unresolved_reloc = FALSE;
3609 case R_X86_64_PLTOFF64:
3610 /* Relocation is PLT entry relative to GOT. For local
3611 symbols it's the symbol itself relative to GOT. */
3613 /* See PLT32 handling. */
3614 && h->plt.offset != (bfd_vma) -1
3615 && htab->elf.splt != NULL)
3617 relocation = (htab->elf.splt->output_section->vma
3618 + htab->elf.splt->output_offset
3620 unresolved_reloc = FALSE;
3623 relocation -= htab->elf.sgotplt->output_section->vma
3624 + htab->elf.sgotplt->output_offset;
3627 case R_X86_64_PLT32:
3628 /* Relocation is to the entry for this symbol in the
3629 procedure linkage table. */
3631 /* Resolve a PLT32 reloc against a local symbol directly,
3632 without using the procedure linkage table. */
3636 if (h->plt.offset == (bfd_vma) -1
3637 || htab->elf.splt == NULL)
3639 /* We didn't make a PLT entry for this symbol. This
3640 happens when statically linking PIC code, or when
3641 using -Bsymbolic. */
3645 relocation = (htab->elf.splt->output_section->vma
3646 + htab->elf.splt->output_offset
3648 unresolved_reloc = FALSE;
3655 && (input_section->flags & SEC_ALLOC) != 0
3656 && (input_section->flags & SEC_READONLY) != 0
3659 bfd_boolean fail = FALSE;
3661 = (r_type == R_X86_64_PC32
3662 && is_32bit_relative_branch (contents, rel->r_offset));
3664 if (SYMBOL_REFERENCES_LOCAL (info, h))
3666 /* Symbol is referenced locally. Make sure it is
3667 defined locally or for a branch. */
3668 fail = !h->def_regular && !branch;
3672 /* Symbol isn't referenced locally. We only allow
3673 branch to symbol with non-default visibility. */
3675 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3682 const char *pic = "";
3684 switch (ELF_ST_VISIBILITY (h->other))
3687 v = _("hidden symbol");
3690 v = _("internal symbol");
3693 v = _("protected symbol");
3697 pic = _("; recompile with -fPIC");
3702 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3704 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3706 (*_bfd_error_handler) (fmt, input_bfd,
3707 x86_64_elf_howto_table[r_type].name,
3708 v, h->root.root.string, pic);
3709 bfd_set_error (bfd_error_bad_value);
3720 /* FIXME: The ABI says the linker should make sure the value is
3721 the same when it's zeroextended to 64 bit. */
3723 if ((input_section->flags & SEC_ALLOC) == 0)
3728 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3729 || h->root.type != bfd_link_hash_undefweak)
3730 && (! IS_X86_64_PCREL_TYPE (r_type)
3731 || ! SYMBOL_CALLS_LOCAL (info, h)))
3732 || (ELIMINATE_COPY_RELOCS
3739 || h->root.type == bfd_link_hash_undefweak
3740 || h->root.type == bfd_link_hash_undefined)))
3742 Elf_Internal_Rela outrel;
3743 bfd_boolean skip, relocate;
3746 /* When generating a shared object, these relocations
3747 are copied into the output file to be resolved at run
3753 _bfd_elf_section_offset (output_bfd, info, input_section,
3755 if (outrel.r_offset == (bfd_vma) -1)
3757 else if (outrel.r_offset == (bfd_vma) -2)
3758 skip = TRUE, relocate = TRUE;
3760 outrel.r_offset += (input_section->output_section->vma
3761 + input_section->output_offset);
3764 memset (&outrel, 0, sizeof outrel);
3766 /* h->dynindx may be -1 if this symbol was marked to
3770 && (IS_X86_64_PCREL_TYPE (r_type)
3772 || ! SYMBOLIC_BIND (info, h)
3773 || ! h->def_regular))
3775 outrel.r_info = htab->r_info (h->dynindx, r_type);
3776 outrel.r_addend = rel->r_addend;
3780 /* This symbol is local, or marked to become local. */
3781 if (r_type == htab->pointer_r_type)
3784 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3785 outrel.r_addend = relocation + rel->r_addend;
3787 else if (r_type == R_X86_64_64
3788 && !ABI_64_P (output_bfd))
3791 outrel.r_info = htab->r_info (0,
3792 R_X86_64_RELATIVE64);
3793 outrel.r_addend = relocation + rel->r_addend;
3794 /* Check addend overflow. */
3795 if ((outrel.r_addend & 0x80000000)
3796 != (rel->r_addend & 0x80000000))
3799 int addend = rel->r_addend;
3800 if (h && h->root.root.string)
3801 name = h->root.root.string;
3803 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3806 (*_bfd_error_handler)
3807 (_("%B: addend -0x%x in relocation %s against "
3808 "symbol `%s' at 0x%lx in section `%A' is "
3810 input_bfd, input_section, addend,
3811 x86_64_elf_howto_table[r_type].name,
3812 name, (unsigned long) rel->r_offset);
3814 (*_bfd_error_handler)
3815 (_("%B: addend 0x%x in relocation %s against "
3816 "symbol `%s' at 0x%lx in section `%A' is "
3818 input_bfd, input_section, addend,
3819 x86_64_elf_howto_table[r_type].name,
3820 name, (unsigned long) rel->r_offset);
3821 bfd_set_error (bfd_error_bad_value);
3829 if (bfd_is_abs_section (sec))
3831 else if (sec == NULL || sec->owner == NULL)
3833 bfd_set_error (bfd_error_bad_value);
3840 /* We are turning this relocation into one
3841 against a section symbol. It would be
3842 proper to subtract the symbol's value,
3843 osec->vma, from the emitted reloc addend,
3844 but ld.so expects buggy relocs. */
3845 osec = sec->output_section;
3846 sindx = elf_section_data (osec)->dynindx;
3849 asection *oi = htab->elf.text_index_section;
3850 sindx = elf_section_data (oi)->dynindx;
3852 BFD_ASSERT (sindx != 0);
3855 outrel.r_info = htab->r_info (sindx, r_type);
3856 outrel.r_addend = relocation + rel->r_addend;
3860 sreloc = elf_section_data (input_section)->sreloc;
3862 if (sreloc == NULL || sreloc->contents == NULL)
3864 r = bfd_reloc_notsupported;
3865 goto check_relocation_error;
3868 elf_append_rela (output_bfd, sreloc, &outrel);
3870 /* If this reloc is against an external symbol, we do
3871 not want to fiddle with the addend. Otherwise, we
3872 need to include the symbol value so that it becomes
3873 an addend for the dynamic reloc. */
3880 case R_X86_64_TLSGD:
3881 case R_X86_64_GOTPC32_TLSDESC:
3882 case R_X86_64_TLSDESC_CALL:
3883 case R_X86_64_GOTTPOFF:
3884 tls_type = GOT_UNKNOWN;
3885 if (h == NULL && local_got_offsets)
3886 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3888 tls_type = elf_x86_64_hash_entry (h)->tls_type;
3890 if (! elf_x86_64_tls_transition (info, input_bfd,
3891 input_section, contents,
3892 symtab_hdr, sym_hashes,
3893 &r_type, tls_type, rel,
3894 relend, h, r_symndx))
3897 if (r_type == R_X86_64_TPOFF32)
3899 bfd_vma roff = rel->r_offset;
3901 BFD_ASSERT (! unresolved_reloc);
3903 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3905 /* GD->LE transition. For 64bit, change
3906 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3907 .word 0x6666; rex64; call __tls_get_addr
3910 leaq foo@tpoff(%rax), %rax
3912 leaq foo@tlsgd(%rip), %rdi
3913 .word 0x6666; rex64; call __tls_get_addr
3916 leaq foo@tpoff(%rax), %rax */
3917 if (ABI_64_P (output_bfd))
3918 memcpy (contents + roff - 4,
3919 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3922 memcpy (contents + roff - 3,
3923 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3925 bfd_put_32 (output_bfd,
3926 elf_x86_64_tpoff (info, relocation),
3927 contents + roff + 8);
3928 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3932 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3934 /* GDesc -> LE transition.
3935 It's originally something like:
3936 leaq x@tlsdesc(%rip), %rax
3939 movl $x@tpoff, %rax. */
3941 unsigned int val, type;
3943 type = bfd_get_8 (input_bfd, contents + roff - 3);
3944 val = bfd_get_8 (input_bfd, contents + roff - 1);
3945 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3946 contents + roff - 3);
3947 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3948 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3949 contents + roff - 1);
3950 bfd_put_32 (output_bfd,
3951 elf_x86_64_tpoff (info, relocation),
3955 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3957 /* GDesc -> LE transition.
3962 bfd_put_8 (output_bfd, 0x66, contents + roff);
3963 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3966 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3968 /* IE->LE transition:
3969 Originally it can be one of:
3970 movq foo@gottpoff(%rip), %reg
3971 addq foo@gottpoff(%rip), %reg
3974 leaq foo(%reg), %reg
3977 unsigned int val, type, reg;
3979 val = bfd_get_8 (input_bfd, contents + roff - 3);
3980 type = bfd_get_8 (input_bfd, contents + roff - 2);
3981 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3987 bfd_put_8 (output_bfd, 0x49,
3988 contents + roff - 3);
3989 else if (!ABI_64_P (output_bfd) && val == 0x44)
3990 bfd_put_8 (output_bfd, 0x41,
3991 contents + roff - 3);
3992 bfd_put_8 (output_bfd, 0xc7,
3993 contents + roff - 2);
3994 bfd_put_8 (output_bfd, 0xc0 | reg,
3995 contents + roff - 1);
3999 /* addq -> addq - addressing with %rsp/%r12 is
4002 bfd_put_8 (output_bfd, 0x49,
4003 contents + roff - 3);
4004 else if (!ABI_64_P (output_bfd) && val == 0x44)
4005 bfd_put_8 (output_bfd, 0x41,
4006 contents + roff - 3);
4007 bfd_put_8 (output_bfd, 0x81,
4008 contents + roff - 2);
4009 bfd_put_8 (output_bfd, 0xc0 | reg,
4010 contents + roff - 1);
4016 bfd_put_8 (output_bfd, 0x4d,
4017 contents + roff - 3);
4018 else if (!ABI_64_P (output_bfd) && val == 0x44)
4019 bfd_put_8 (output_bfd, 0x45,
4020 contents + roff - 3);
4021 bfd_put_8 (output_bfd, 0x8d,
4022 contents + roff - 2);
4023 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4024 contents + roff - 1);
4026 bfd_put_32 (output_bfd,
4027 elf_x86_64_tpoff (info, relocation),
4035 if (htab->elf.sgot == NULL)
4040 off = h->got.offset;
4041 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4045 if (local_got_offsets == NULL)
4048 off = local_got_offsets[r_symndx];
4049 offplt = local_tlsdesc_gotents[r_symndx];
4056 Elf_Internal_Rela outrel;
4060 if (htab->elf.srelgot == NULL)
4063 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4065 if (GOT_TLS_GDESC_P (tls_type))
4067 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4068 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4069 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4070 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4071 + htab->elf.sgotplt->output_offset
4073 + htab->sgotplt_jump_table_size);
4074 sreloc = htab->elf.srelplt;
4076 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4078 outrel.r_addend = 0;
4079 elf_append_rela (output_bfd, sreloc, &outrel);
4082 sreloc = htab->elf.srelgot;
4084 outrel.r_offset = (htab->elf.sgot->output_section->vma
4085 + htab->elf.sgot->output_offset + off);
4087 if (GOT_TLS_GD_P (tls_type))
4088 dr_type = R_X86_64_DTPMOD64;
4089 else if (GOT_TLS_GDESC_P (tls_type))
4092 dr_type = R_X86_64_TPOFF64;
4094 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4095 outrel.r_addend = 0;
4096 if ((dr_type == R_X86_64_TPOFF64
4097 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4098 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4099 outrel.r_info = htab->r_info (indx, dr_type);
4101 elf_append_rela (output_bfd, sreloc, &outrel);
4103 if (GOT_TLS_GD_P (tls_type))
4107 BFD_ASSERT (! unresolved_reloc);
4108 bfd_put_64 (output_bfd,
4109 relocation - elf_x86_64_dtpoff_base (info),
4110 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4114 bfd_put_64 (output_bfd, 0,
4115 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4116 outrel.r_info = htab->r_info (indx,
4118 outrel.r_offset += GOT_ENTRY_SIZE;
4119 elf_append_rela (output_bfd, sreloc,
4128 local_got_offsets[r_symndx] |= 1;
4131 if (off >= (bfd_vma) -2
4132 && ! GOT_TLS_GDESC_P (tls_type))
4134 if (r_type == ELF32_R_TYPE (rel->r_info))
4136 if (r_type == R_X86_64_GOTPC32_TLSDESC
4137 || r_type == R_X86_64_TLSDESC_CALL)
4138 relocation = htab->elf.sgotplt->output_section->vma
4139 + htab->elf.sgotplt->output_offset
4140 + offplt + htab->sgotplt_jump_table_size;
4142 relocation = htab->elf.sgot->output_section->vma
4143 + htab->elf.sgot->output_offset + off;
4144 unresolved_reloc = FALSE;
4148 bfd_vma roff = rel->r_offset;
4150 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4152 /* GD->IE transition. For 64bit, change
4153 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4154 .word 0x6666; rex64; call __tls_get_addr@plt
4157 addq foo@gottpoff(%rip), %rax
4159 leaq foo@tlsgd(%rip), %rdi
4160 .word 0x6666; rex64; call __tls_get_addr@plt
4163 addq foo@gottpoff(%rip), %rax */
4164 if (ABI_64_P (output_bfd))
4165 memcpy (contents + roff - 4,
4166 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4169 memcpy (contents + roff - 3,
4170 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4173 relocation = (htab->elf.sgot->output_section->vma
4174 + htab->elf.sgot->output_offset + off
4176 - input_section->output_section->vma
4177 - input_section->output_offset
4179 bfd_put_32 (output_bfd, relocation,
4180 contents + roff + 8);
4181 /* Skip R_X86_64_PLT32. */
4185 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4187 /* GDesc -> IE transition.
4188 It's originally something like:
4189 leaq x@tlsdesc(%rip), %rax
4192 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4194 /* Now modify the instruction as appropriate. To
4195 turn a leaq into a movq in the form we use it, it
4196 suffices to change the second byte from 0x8d to
4198 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4200 bfd_put_32 (output_bfd,
4201 htab->elf.sgot->output_section->vma
4202 + htab->elf.sgot->output_offset + off
4204 - input_section->output_section->vma
4205 - input_section->output_offset
4210 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4212 /* GDesc -> IE transition.
4219 bfd_put_8 (output_bfd, 0x66, contents + roff);
4220 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4228 case R_X86_64_TLSLD:
4229 if (! elf_x86_64_tls_transition (info, input_bfd,
4230 input_section, contents,
4231 symtab_hdr, sym_hashes,
4232 &r_type, GOT_UNKNOWN,
4233 rel, relend, h, r_symndx))
4236 if (r_type != R_X86_64_TLSLD)
4238 /* LD->LE transition:
4239 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4240 For 64bit, we change it into:
4241 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4242 For 32bit, we change it into:
4243 nopl 0x0(%rax); movl %fs:0, %eax. */
4245 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4246 if (ABI_64_P (output_bfd))
4247 memcpy (contents + rel->r_offset - 3,
4248 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4250 memcpy (contents + rel->r_offset - 3,
4251 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4252 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
4257 if (htab->elf.sgot == NULL)
4260 off = htab->tls_ld_got.offset;
4265 Elf_Internal_Rela outrel;
4267 if (htab->elf.srelgot == NULL)
4270 outrel.r_offset = (htab->elf.sgot->output_section->vma
4271 + htab->elf.sgot->output_offset + off);
4273 bfd_put_64 (output_bfd, 0,
4274 htab->elf.sgot->contents + off);
4275 bfd_put_64 (output_bfd, 0,
4276 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4277 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4278 outrel.r_addend = 0;
4279 elf_append_rela (output_bfd, htab->elf.srelgot,
4281 htab->tls_ld_got.offset |= 1;
4283 relocation = htab->elf.sgot->output_section->vma
4284 + htab->elf.sgot->output_offset + off;
4285 unresolved_reloc = FALSE;
4288 case R_X86_64_DTPOFF32:
4289 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4290 relocation -= elf_x86_64_dtpoff_base (info);
4292 relocation = elf_x86_64_tpoff (info, relocation);
4295 case R_X86_64_TPOFF32:
4296 case R_X86_64_TPOFF64:
4297 BFD_ASSERT (info->executable);
4298 relocation = elf_x86_64_tpoff (info, relocation);
4305 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4306 because such sections are not SEC_ALLOC and thus ld.so will
4307 not process them. */
4308 if (unresolved_reloc
4309 && !((input_section->flags & SEC_DEBUGGING) != 0
4311 && _bfd_elf_section_offset (output_bfd, info, input_section,
4312 rel->r_offset) != (bfd_vma) -1)
4314 (*_bfd_error_handler)
4315 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4318 (long) rel->r_offset,
4320 h->root.root.string);
4325 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4326 contents, rel->r_offset,
4327 relocation, rel->r_addend);
4329 check_relocation_error:
4330 if (r != bfd_reloc_ok)
4335 name = h->root.root.string;
4338 name = bfd_elf_string_from_elf_section (input_bfd,
4339 symtab_hdr->sh_link,
4344 name = bfd_section_name (input_bfd, sec);
4347 if (r == bfd_reloc_overflow)
4349 if (! ((*info->callbacks->reloc_overflow)
4350 (info, (h ? &h->root : NULL), name, howto->name,
4351 (bfd_vma) 0, input_bfd, input_section,
4357 (*_bfd_error_handler)
4358 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4359 input_bfd, input_section,
4360 (long) rel->r_offset, name, (int) r);
4369 /* Finish up dynamic symbol handling. We set the contents of various
4370 dynamic sections here. */
4373 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4374 struct bfd_link_info *info,
4375 struct elf_link_hash_entry *h,
4376 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4378 struct elf_x86_64_link_hash_table *htab;
4379 const struct elf_x86_64_backend_data *const abed
4380 = get_elf_x86_64_backend_data (output_bfd);
4382 htab = elf_x86_64_hash_table (info);
4386 if (h->plt.offset != (bfd_vma) -1)
4390 Elf_Internal_Rela rela;
4392 asection *plt, *gotplt, *relplt;
4393 const struct elf_backend_data *bed;
4395 /* When building a static executable, use .iplt, .igot.plt and
4396 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4397 if (htab->elf.splt != NULL)
4399 plt = htab->elf.splt;
4400 gotplt = htab->elf.sgotplt;
4401 relplt = htab->elf.srelplt;
4405 plt = htab->elf.iplt;
4406 gotplt = htab->elf.igotplt;
4407 relplt = htab->elf.irelplt;
4410 /* This symbol has an entry in the procedure linkage table. Set
4412 if ((h->dynindx == -1
4413 && !((h->forced_local || info->executable)
4415 && h->type == STT_GNU_IFUNC))
4421 /* Get the index in the procedure linkage table which
4422 corresponds to this symbol. This is the index of this symbol
4423 in all the symbols for which we are making plt entries. The
4424 first entry in the procedure linkage table is reserved.
4426 Get the offset into the .got table of the entry that
4427 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4428 bytes. The first three are reserved for the dynamic linker.
4430 For static executables, we don't reserve anything. */
4432 if (plt == htab->elf.splt)
4434 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4435 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4439 got_offset = h->plt.offset / abed->plt_entry_size;
4440 got_offset = got_offset * GOT_ENTRY_SIZE;
4443 /* Fill in the entry in the procedure linkage table. */
4444 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4445 abed->plt_entry_size);
4447 /* Insert the relocation positions of the plt section. */
4449 /* Put offset the PC-relative instruction referring to the GOT entry,
4450 subtracting the size of that instruction. */
4451 bfd_put_32 (output_bfd,
4452 (gotplt->output_section->vma
4453 + gotplt->output_offset
4455 - plt->output_section->vma
4456 - plt->output_offset
4458 - abed->plt_got_insn_size),
4459 plt->contents + h->plt.offset + abed->plt_got_offset);
4461 /* Fill in the entry in the global offset table, initially this
4462 points to the second part of the PLT entry. */
4463 bfd_put_64 (output_bfd, (plt->output_section->vma
4464 + plt->output_offset
4465 + h->plt.offset + abed->plt_lazy_offset),
4466 gotplt->contents + got_offset);
4468 /* Fill in the entry in the .rela.plt section. */
4469 rela.r_offset = (gotplt->output_section->vma
4470 + gotplt->output_offset
4472 if (h->dynindx == -1
4473 || ((info->executable
4474 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4476 && h->type == STT_GNU_IFUNC))
4478 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4479 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4480 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4481 rela.r_addend = (h->root.u.def.value
4482 + h->root.u.def.section->output_section->vma
4483 + h->root.u.def.section->output_offset);
4484 /* R_X86_64_IRELATIVE comes last. */
4485 plt_index = htab->next_irelative_index--;
4489 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
4491 plt_index = htab->next_jump_slot_index++;
4494 /* Don't fill PLT entry for static executables. */
4495 if (plt == htab->elf.splt)
4497 /* Put relocation index. */
4498 bfd_put_32 (output_bfd, plt_index,
4499 plt->contents + h->plt.offset + abed->plt_reloc_offset);
4500 /* Put offset for jmp .PLT0. */
4501 bfd_put_32 (output_bfd, - (h->plt.offset + abed->plt_plt_insn_end),
4502 plt->contents + h->plt.offset + abed->plt_plt_offset);
4505 bed = get_elf_backend_data (output_bfd);
4506 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
4507 bed->s->swap_reloca_out (output_bfd, &rela, loc);
4509 if (!h->def_regular)
4511 /* Mark the symbol as undefined, rather than as defined in
4512 the .plt section. Leave the value if there were any
4513 relocations where pointer equality matters (this is a clue
4514 for the dynamic linker, to make function pointer
4515 comparisons work between an application and shared
4516 library), otherwise set it to zero. If a function is only
4517 called from a binary, there is no need to slow down
4518 shared libraries because of that. */
4519 sym->st_shndx = SHN_UNDEF;
4520 if (!h->pointer_equality_needed)
4525 if (h->got.offset != (bfd_vma) -1
4526 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
4527 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
4529 Elf_Internal_Rela rela;
4531 /* This symbol has an entry in the global offset table. Set it
4533 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4536 rela.r_offset = (htab->elf.sgot->output_section->vma
4537 + htab->elf.sgot->output_offset
4538 + (h->got.offset &~ (bfd_vma) 1));
4540 /* If this is a static link, or it is a -Bsymbolic link and the
4541 symbol is defined locally or was forced to be local because
4542 of a version file, we just want to emit a RELATIVE reloc.
4543 The entry in the global offset table will already have been
4544 initialized in the relocate_section function. */
4546 && h->type == STT_GNU_IFUNC)
4550 /* Generate R_X86_64_GLOB_DAT. */
4557 if (!h->pointer_equality_needed)
4560 /* For non-shared object, we can't use .got.plt, which
4561 contains the real function addres if we need pointer
4562 equality. We load the GOT entry with the PLT entry. */
4563 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4564 bfd_put_64 (output_bfd, (plt->output_section->vma
4565 + plt->output_offset
4567 htab->elf.sgot->contents + h->got.offset);
4571 else if (info->shared
4572 && SYMBOL_REFERENCES_LOCAL (info, h))
4574 if (!h->def_regular)
4576 BFD_ASSERT((h->got.offset & 1) != 0);
4577 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4578 rela.r_addend = (h->root.u.def.value
4579 + h->root.u.def.section->output_section->vma
4580 + h->root.u.def.section->output_offset);
4584 BFD_ASSERT((h->got.offset & 1) == 0);
4586 bfd_put_64 (output_bfd, (bfd_vma) 0,
4587 htab->elf.sgot->contents + h->got.offset);
4588 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4592 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
4597 Elf_Internal_Rela rela;
4599 /* This symbol needs a copy reloc. Set it up. */
4601 if (h->dynindx == -1
4602 || (h->root.type != bfd_link_hash_defined
4603 && h->root.type != bfd_link_hash_defweak)
4604 || htab->srelbss == NULL)
4607 rela.r_offset = (h->root.u.def.value
4608 + h->root.u.def.section->output_section->vma
4609 + h->root.u.def.section->output_offset);
4610 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4612 elf_append_rela (output_bfd, htab->srelbss, &rela);
4618 /* Finish up local dynamic symbol handling. We set the contents of
4619 various dynamic sections here. */
4622 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4624 struct elf_link_hash_entry *h
4625 = (struct elf_link_hash_entry *) *slot;
4626 struct bfd_link_info *info
4627 = (struct bfd_link_info *) inf;
4629 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4633 /* Used to decide how to sort relocs in an optimal manner for the
4634 dynamic linker, before writing them out. */
4636 static enum elf_reloc_type_class
4637 elf_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
4639 switch ((int) ELF32_R_TYPE (rela->r_info))
4641 case R_X86_64_RELATIVE:
4642 case R_X86_64_RELATIVE64:
4643 return reloc_class_relative;
4644 case R_X86_64_JUMP_SLOT:
4645 return reloc_class_plt;
4647 return reloc_class_copy;
4649 return reloc_class_normal;
4653 /* Finish up the dynamic sections. */
4656 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4657 struct bfd_link_info *info)
4659 struct elf_x86_64_link_hash_table *htab;
4662 const struct elf_x86_64_backend_data *const abed
4663 = get_elf_x86_64_backend_data (output_bfd);
4665 htab = elf_x86_64_hash_table (info);
4669 dynobj = htab->elf.dynobj;
4670 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4672 if (htab->elf.dynamic_sections_created)
4674 bfd_byte *dyncon, *dynconend;
4675 const struct elf_backend_data *bed;
4676 bfd_size_type sizeof_dyn;
4678 if (sdyn == NULL || htab->elf.sgot == NULL)
4681 bed = get_elf_backend_data (dynobj);
4682 sizeof_dyn = bed->s->sizeof_dyn;
4683 dyncon = sdyn->contents;
4684 dynconend = sdyn->contents + sdyn->size;
4685 for (; dyncon < dynconend; dyncon += sizeof_dyn)
4687 Elf_Internal_Dyn dyn;
4690 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
4698 s = htab->elf.sgotplt;
4699 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4703 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4707 s = htab->elf.srelplt->output_section;
4708 dyn.d_un.d_val = s->size;
4712 /* The procedure linkage table relocs (DT_JMPREL) should
4713 not be included in the overall relocs (DT_RELA).
4714 Therefore, we override the DT_RELASZ entry here to
4715 make it not include the JMPREL relocs. Since the
4716 linker script arranges for .rela.plt to follow all
4717 other relocation sections, we don't have to worry
4718 about changing the DT_RELA entry. */
4719 if (htab->elf.srelplt != NULL)
4721 s = htab->elf.srelplt->output_section;
4722 dyn.d_un.d_val -= s->size;
4726 case DT_TLSDESC_PLT:
4728 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4729 + htab->tlsdesc_plt;
4732 case DT_TLSDESC_GOT:
4734 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4735 + htab->tlsdesc_got;
4739 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
4742 /* Fill in the special first entry in the procedure linkage table. */
4743 if (htab->elf.splt && htab->elf.splt->size > 0)
4745 /* Fill in the first entry in the procedure linkage table. */
4746 memcpy (htab->elf.splt->contents,
4747 abed->plt0_entry, abed->plt_entry_size);
4748 /* Add offset for pushq GOT+8(%rip), since the instruction
4749 uses 6 bytes subtract this value. */
4750 bfd_put_32 (output_bfd,
4751 (htab->elf.sgotplt->output_section->vma
4752 + htab->elf.sgotplt->output_offset
4754 - htab->elf.splt->output_section->vma
4755 - htab->elf.splt->output_offset
4757 htab->elf.splt->contents + abed->plt0_got1_offset);
4758 /* Add offset for the PC-relative instruction accessing GOT+16,
4759 subtracting the offset to the end of that instruction. */
4760 bfd_put_32 (output_bfd,
4761 (htab->elf.sgotplt->output_section->vma
4762 + htab->elf.sgotplt->output_offset
4764 - htab->elf.splt->output_section->vma
4765 - htab->elf.splt->output_offset
4766 - abed->plt0_got2_insn_end),
4767 htab->elf.splt->contents + abed->plt0_got2_offset);
4769 elf_section_data (htab->elf.splt->output_section)
4770 ->this_hdr.sh_entsize = abed->plt_entry_size;
4772 if (htab->tlsdesc_plt)
4774 bfd_put_64 (output_bfd, (bfd_vma) 0,
4775 htab->elf.sgot->contents + htab->tlsdesc_got);
4777 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4778 abed->plt0_entry, abed->plt_entry_size);
4780 /* Add offset for pushq GOT+8(%rip), since the
4781 instruction uses 6 bytes subtract this value. */
4782 bfd_put_32 (output_bfd,
4783 (htab->elf.sgotplt->output_section->vma
4784 + htab->elf.sgotplt->output_offset
4786 - htab->elf.splt->output_section->vma
4787 - htab->elf.splt->output_offset
4790 htab->elf.splt->contents
4791 + htab->tlsdesc_plt + abed->plt0_got1_offset);
4792 /* Add offset for the PC-relative instruction accessing GOT+TDG,
4793 where TGD stands for htab->tlsdesc_got, subtracting the offset
4794 to the end of that instruction. */
4795 bfd_put_32 (output_bfd,
4796 (htab->elf.sgot->output_section->vma
4797 + htab->elf.sgot->output_offset
4799 - htab->elf.splt->output_section->vma
4800 - htab->elf.splt->output_offset
4802 - abed->plt0_got2_insn_end),
4803 htab->elf.splt->contents
4804 + htab->tlsdesc_plt + abed->plt0_got2_offset);
4809 if (htab->elf.sgotplt)
4811 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4813 (*_bfd_error_handler)
4814 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4818 /* Fill in the first three entries in the global offset table. */
4819 if (htab->elf.sgotplt->size > 0)
4821 /* Set the first entry in the global offset table to the address of
4822 the dynamic section. */
4824 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4826 bfd_put_64 (output_bfd,
4827 sdyn->output_section->vma + sdyn->output_offset,
4828 htab->elf.sgotplt->contents);
4829 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4830 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4831 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4834 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4838 /* Adjust .eh_frame for .plt section. */
4839 if (htab->plt_eh_frame != NULL
4840 && htab->plt_eh_frame->contents != NULL)
4842 if (htab->elf.splt != NULL
4843 && htab->elf.splt->size != 0
4844 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4845 && htab->elf.splt->output_section != NULL
4846 && htab->plt_eh_frame->output_section != NULL)
4848 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4849 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4850 + htab->plt_eh_frame->output_offset
4851 + PLT_FDE_START_OFFSET;
4852 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4853 htab->plt_eh_frame->contents
4854 + PLT_FDE_START_OFFSET);
4856 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4858 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4860 htab->plt_eh_frame->contents))
4865 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4866 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4869 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4870 htab_traverse (htab->loc_hash_table,
4871 elf_x86_64_finish_local_dynamic_symbol,
4877 /* Return address for Ith PLT stub in section PLT, for relocation REL
4878 or (bfd_vma) -1 if it should not be included. */
4881 elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4882 const arelent *rel ATTRIBUTE_UNUSED)
4884 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4887 /* Handle an x86-64 specific section when reading an object file. This
4888 is called when elfcode.h finds a section with an unknown type. */
4891 elf_x86_64_section_from_shdr (bfd *abfd,
4892 Elf_Internal_Shdr *hdr,
4896 if (hdr->sh_type != SHT_X86_64_UNWIND)
4899 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4905 /* Hook called by the linker routine which adds symbols from an object
4906 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4910 elf_x86_64_add_symbol_hook (bfd *abfd,
4911 struct bfd_link_info *info,
4912 Elf_Internal_Sym *sym,
4913 const char **namep ATTRIBUTE_UNUSED,
4914 flagword *flagsp ATTRIBUTE_UNUSED,
4920 switch (sym->st_shndx)
4922 case SHN_X86_64_LCOMMON:
4923 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4926 lcomm = bfd_make_section_with_flags (abfd,
4930 | SEC_LINKER_CREATED));
4933 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4936 *valp = sym->st_size;
4940 if ((abfd->flags & DYNAMIC) == 0
4941 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
4942 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
4943 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
4949 /* Given a BFD section, try to locate the corresponding ELF section
4953 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4954 asection *sec, int *index_return)
4956 if (sec == &_bfd_elf_large_com_section)
4958 *index_return = SHN_X86_64_LCOMMON;
4964 /* Process a symbol. */
4967 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4970 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4972 switch (elfsym->internal_elf_sym.st_shndx)
4974 case SHN_X86_64_LCOMMON:
4975 asym->section = &_bfd_elf_large_com_section;
4976 asym->value = elfsym->internal_elf_sym.st_size;
4977 /* Common symbol doesn't set BSF_GLOBAL. */
4978 asym->flags &= ~BSF_GLOBAL;
4984 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
4986 return (sym->st_shndx == SHN_COMMON
4987 || sym->st_shndx == SHN_X86_64_LCOMMON);
4991 elf_x86_64_common_section_index (asection *sec)
4993 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4996 return SHN_X86_64_LCOMMON;
5000 elf_x86_64_common_section (asection *sec)
5002 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5003 return bfd_com_section_ptr;
5005 return &_bfd_elf_large_com_section;
5009 elf_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5010 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
5011 struct elf_link_hash_entry *h,
5012 Elf_Internal_Sym *sym,
5014 bfd_vma *pvalue ATTRIBUTE_UNUSED,
5015 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
5016 bfd_boolean *skip ATTRIBUTE_UNUSED,
5017 bfd_boolean *override ATTRIBUTE_UNUSED,
5018 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
5019 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
5020 bfd_boolean *newdyn ATTRIBUTE_UNUSED,
5021 bfd_boolean *newdef,
5022 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
5023 bfd_boolean *newweak ATTRIBUTE_UNUSED,
5024 bfd *abfd ATTRIBUTE_UNUSED,
5026 bfd_boolean *olddyn ATTRIBUTE_UNUSED,
5027 bfd_boolean *olddef,
5028 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
5029 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
5033 /* A normal common symbol and a large common symbol result in a
5034 normal common symbol. We turn the large common symbol into a
5037 && h->root.type == bfd_link_hash_common
5039 && bfd_is_com_section (*sec)
5042 if (sym->st_shndx == SHN_COMMON
5043 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
5045 h->root.u.c.p->section
5046 = bfd_make_section_old_way (oldbfd, "COMMON");
5047 h->root.u.c.p->section->flags = SEC_ALLOC;
5049 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5050 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
5051 *psec = *sec = bfd_com_section_ptr;
5058 elf_x86_64_additional_program_headers (bfd *abfd,
5059 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5064 /* Check to see if we need a large readonly segment. */
5065 s = bfd_get_section_by_name (abfd, ".lrodata");
5066 if (s && (s->flags & SEC_LOAD))
5069 /* Check to see if we need a large data segment. Since .lbss sections
5070 is placed right after the .bss section, there should be no need for
5071 a large data segment just because of .lbss. */
5072 s = bfd_get_section_by_name (abfd, ".ldata");
5073 if (s && (s->flags & SEC_LOAD))
5079 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5082 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5084 if (h->plt.offset != (bfd_vma) -1
5086 && !h->pointer_equality_needed)
5089 return _bfd_elf_hash_symbol (h);
5092 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5095 elf_x86_64_relocs_compatible (const bfd_target *input,
5096 const bfd_target *output)
5098 return ((xvec_get_elf_backend_data (input)->s->elfclass
5099 == xvec_get_elf_backend_data (output)->s->elfclass)
5100 && _bfd_elf_relocs_compatible (input, output));
5103 static const struct bfd_elf_special_section
5104 elf_x86_64_special_sections[]=
5106 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5107 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5108 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5109 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5110 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5111 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5112 { NULL, 0, 0, 0, 0 }
5115 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
5116 #define TARGET_LITTLE_NAME "elf64-x86-64"
5117 #define ELF_ARCH bfd_arch_i386
5118 #define ELF_TARGET_ID X86_64_ELF_DATA
5119 #define ELF_MACHINE_CODE EM_X86_64
5120 #define ELF_MAXPAGESIZE 0x200000
5121 #define ELF_MINPAGESIZE 0x1000
5122 #define ELF_COMMONPAGESIZE 0x1000
5124 #define elf_backend_can_gc_sections 1
5125 #define elf_backend_can_refcount 1
5126 #define elf_backend_want_got_plt 1
5127 #define elf_backend_plt_readonly 1
5128 #define elf_backend_want_plt_sym 0
5129 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5130 #define elf_backend_rela_normal 1
5131 #define elf_backend_plt_alignment 4
5133 #define elf_info_to_howto elf_x86_64_info_to_howto
5135 #define bfd_elf64_bfd_link_hash_table_create \
5136 elf_x86_64_link_hash_table_create
5137 #define bfd_elf64_bfd_link_hash_table_free \
5138 elf_x86_64_link_hash_table_free
5139 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5140 #define bfd_elf64_bfd_reloc_name_lookup \
5141 elf_x86_64_reloc_name_lookup
5143 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5144 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5145 #define elf_backend_check_relocs elf_x86_64_check_relocs
5146 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5147 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5148 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5149 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5150 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5151 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5152 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5153 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5155 #define elf_backend_write_core_note elf_x86_64_write_core_note
5157 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5158 #define elf_backend_relocate_section elf_x86_64_relocate_section
5159 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5160 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5161 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5162 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5163 #define elf_backend_object_p elf64_x86_64_elf_object_p
5164 #define bfd_elf64_mkobject elf_x86_64_mkobject
5166 #define elf_backend_section_from_shdr \
5167 elf_x86_64_section_from_shdr
5169 #define elf_backend_section_from_bfd_section \
5170 elf_x86_64_elf_section_from_bfd_section
5171 #define elf_backend_add_symbol_hook \
5172 elf_x86_64_add_symbol_hook
5173 #define elf_backend_symbol_processing \
5174 elf_x86_64_symbol_processing
5175 #define elf_backend_common_section_index \
5176 elf_x86_64_common_section_index
5177 #define elf_backend_common_section \
5178 elf_x86_64_common_section
5179 #define elf_backend_common_definition \
5180 elf_x86_64_common_definition
5181 #define elf_backend_merge_symbol \
5182 elf_x86_64_merge_symbol
5183 #define elf_backend_special_sections \
5184 elf_x86_64_special_sections
5185 #define elf_backend_additional_program_headers \
5186 elf_x86_64_additional_program_headers
5187 #define elf_backend_hash_symbol \
5188 elf_x86_64_hash_symbol
5190 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5192 #include "elf64-target.h"
5194 /* FreeBSD support. */
5196 #undef TARGET_LITTLE_SYM
5197 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
5198 #undef TARGET_LITTLE_NAME
5199 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5202 #define ELF_OSABI ELFOSABI_FREEBSD
5205 #define elf64_bed elf64_x86_64_fbsd_bed
5207 #include "elf64-target.h"
5209 /* Solaris 2 support. */
5211 #undef TARGET_LITTLE_SYM
5212 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
5213 #undef TARGET_LITTLE_NAME
5214 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5216 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5217 objects won't be recognized. */
5221 #define elf64_bed elf64_x86_64_sol2_bed
5223 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5225 #undef elf_backend_static_tls_alignment
5226 #define elf_backend_static_tls_alignment 16
5228 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5230 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5232 #undef elf_backend_want_plt_sym
5233 #define elf_backend_want_plt_sym 1
5235 #include "elf64-target.h"
5237 /* Native Client support. */
5239 #undef TARGET_LITTLE_SYM
5240 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec
5241 #undef TARGET_LITTLE_NAME
5242 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5244 #define elf64_bed elf64_x86_64_nacl_bed
5246 #undef ELF_MAXPAGESIZE
5247 #undef ELF_MINPAGESIZE
5248 #undef ELF_COMMONPAGESIZE
5249 #define ELF_MAXPAGESIZE 0x10000
5250 #define ELF_MINPAGESIZE 0x10000
5251 #define ELF_COMMONPAGESIZE 0x10000
5253 /* Restore defaults. */
5255 #undef elf_backend_static_tls_alignment
5256 #undef elf_backend_want_plt_sym
5257 #define elf_backend_want_plt_sym 0
5259 /* NaCl uses substantially different PLT entries for the same effects. */
5261 #undef elf_backend_plt_alignment
5262 #define elf_backend_plt_alignment 5
5263 #define NACL_PLT_ENTRY_SIZE 64
5264 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5266 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5268 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5269 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5270 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5271 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5272 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5274 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5275 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopl %cs:0x0(%rax,%rax,1) */
5277 /* 32 bytes of nop to pad out to the standard size. */
5278 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5279 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5280 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5281 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5282 0x66, /* excess data32 prefix */
5286 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5288 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5289 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5290 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5291 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5293 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5294 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5295 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5297 /* Lazy GOT entries point here (32-byte aligned). */
5298 0x68, /* pushq immediate */
5299 0, 0, 0, 0, /* replaced with index into relocation table. */
5300 0xe9, /* jmp relative */
5301 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5303 /* 22 bytes of nop to pad out to the standard size. */
5304 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5305 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5306 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5309 /* .eh_frame covering the .plt section. */
5311 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
5313 #if (PLT_CIE_LENGTH != 20 \
5314 || PLT_FDE_LENGTH != 36 \
5315 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5316 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5317 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5319 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5320 0, 0, 0, 0, /* CIE ID */
5321 1, /* CIE version */
5322 'z', 'R', 0, /* Augmentation string */
5323 1, /* Code alignment factor */
5324 0x78, /* Data alignment factor */
5325 16, /* Return address column */
5326 1, /* Augmentation size */
5327 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5328 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5329 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5330 DW_CFA_nop, DW_CFA_nop,
5332 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5333 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
5334 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5335 0, 0, 0, 0, /* .plt size goes here */
5336 0, /* Augmentation size */
5337 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
5338 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5339 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
5340 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5341 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5342 13, /* Block length */
5343 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
5344 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
5345 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5346 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
5347 DW_CFA_nop, DW_CFA_nop
5350 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
5352 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
5353 elf_x86_64_nacl_plt_entry, /* plt_entry */
5354 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5355 2, /* plt0_got1_offset */
5356 9, /* plt0_got2_offset */
5357 13, /* plt0_got2_insn_end */
5358 3, /* plt_got_offset */
5359 33, /* plt_reloc_offset */
5360 38, /* plt_plt_offset */
5361 7, /* plt_got_insn_size */
5362 42, /* plt_plt_insn_end */
5363 32, /* plt_lazy_offset */
5364 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
5365 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
5368 #undef elf_backend_arch_data
5369 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5371 #undef elf_backend_modify_segment_map
5372 #define elf_backend_modify_segment_map nacl_modify_segment_map
5373 #undef elf_backend_modify_program_headers
5374 #define elf_backend_modify_program_headers nacl_modify_program_headers
5376 #include "elf64-target.h"
5378 /* Native Client x32 support. */
5380 #undef TARGET_LITTLE_SYM
5381 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec
5382 #undef TARGET_LITTLE_NAME
5383 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5385 #define elf32_bed elf32_x86_64_nacl_bed
5387 #define bfd_elf32_bfd_link_hash_table_create \
5388 elf_x86_64_link_hash_table_create
5389 #define bfd_elf32_bfd_link_hash_table_free \
5390 elf_x86_64_link_hash_table_free
5391 #define bfd_elf32_bfd_reloc_type_lookup \
5392 elf_x86_64_reloc_type_lookup
5393 #define bfd_elf32_bfd_reloc_name_lookup \
5394 elf_x86_64_reloc_name_lookup
5395 #define bfd_elf32_mkobject \
5398 #undef elf_backend_object_p
5399 #define elf_backend_object_p \
5400 elf32_x86_64_elf_object_p
5402 #undef elf_backend_bfd_from_remote_memory
5403 #define elf_backend_bfd_from_remote_memory \
5404 _bfd_elf32_bfd_from_remote_memory
5406 #undef elf_backend_size_info
5407 #define elf_backend_size_info \
5408 _bfd_elf32_size_info
5410 #include "elf32-target.h"
5412 /* Restore defaults. */
5413 #undef elf_backend_object_p
5414 #define elf_backend_object_p elf64_x86_64_elf_object_p
5415 #undef elf_backend_bfd_from_remote_memory
5416 #undef elf_backend_size_info
5417 #undef elf_backend_modify_segment_map
5418 #undef elf_backend_modify_program_headers
5420 /* Intel L1OM support. */
5423 elf64_l1om_elf_object_p (bfd *abfd)
5425 /* Set the right machine number for an L1OM elf64 file. */
5426 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
5430 #undef TARGET_LITTLE_SYM
5431 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
5432 #undef TARGET_LITTLE_NAME
5433 #define TARGET_LITTLE_NAME "elf64-l1om"
5435 #define ELF_ARCH bfd_arch_l1om
5437 #undef ELF_MACHINE_CODE
5438 #define ELF_MACHINE_CODE EM_L1OM
5443 #define elf64_bed elf64_l1om_bed
5445 #undef elf_backend_object_p
5446 #define elf_backend_object_p elf64_l1om_elf_object_p
5448 /* Restore defaults. */
5449 #undef ELF_MAXPAGESIZE
5450 #undef ELF_MINPAGESIZE
5451 #undef ELF_COMMONPAGESIZE
5452 #define ELF_MAXPAGESIZE 0x200000
5453 #define ELF_MINPAGESIZE 0x1000
5454 #define ELF_COMMONPAGESIZE 0x1000
5455 #undef elf_backend_plt_alignment
5456 #define elf_backend_plt_alignment 4
5457 #undef elf_backend_arch_data
5458 #define elf_backend_arch_data &elf_x86_64_arch_bed
5460 #include "elf64-target.h"
5462 /* FreeBSD L1OM support. */
5464 #undef TARGET_LITTLE_SYM
5465 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
5466 #undef TARGET_LITTLE_NAME
5467 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5470 #define ELF_OSABI ELFOSABI_FREEBSD
5473 #define elf64_bed elf64_l1om_fbsd_bed
5475 #include "elf64-target.h"
5477 /* Intel K1OM support. */
5480 elf64_k1om_elf_object_p (bfd *abfd)
5482 /* Set the right machine number for an K1OM elf64 file. */
5483 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
5487 #undef TARGET_LITTLE_SYM
5488 #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec
5489 #undef TARGET_LITTLE_NAME
5490 #define TARGET_LITTLE_NAME "elf64-k1om"
5492 #define ELF_ARCH bfd_arch_k1om
5494 #undef ELF_MACHINE_CODE
5495 #define ELF_MACHINE_CODE EM_K1OM
5500 #define elf64_bed elf64_k1om_bed
5502 #undef elf_backend_object_p
5503 #define elf_backend_object_p elf64_k1om_elf_object_p
5505 #undef elf_backend_static_tls_alignment
5507 #undef elf_backend_want_plt_sym
5508 #define elf_backend_want_plt_sym 0
5510 #include "elf64-target.h"
5512 /* FreeBSD K1OM support. */
5514 #undef TARGET_LITTLE_SYM
5515 #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec
5516 #undef TARGET_LITTLE_NAME
5517 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5520 #define ELF_OSABI ELFOSABI_FREEBSD
5523 #define elf64_bed elf64_k1om_fbsd_bed
5525 #include "elf64-target.h"
5527 /* 32bit x86-64 support. */
5529 #undef TARGET_LITTLE_SYM
5530 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
5531 #undef TARGET_LITTLE_NAME
5532 #define TARGET_LITTLE_NAME "elf32-x86-64"
5536 #define ELF_ARCH bfd_arch_i386
5538 #undef ELF_MACHINE_CODE
5539 #define ELF_MACHINE_CODE EM_X86_64
5543 #undef elf_backend_object_p
5544 #define elf_backend_object_p \
5545 elf32_x86_64_elf_object_p
5547 #undef elf_backend_bfd_from_remote_memory
5548 #define elf_backend_bfd_from_remote_memory \
5549 _bfd_elf32_bfd_from_remote_memory
5551 #undef elf_backend_size_info
5552 #define elf_backend_size_info \
5553 _bfd_elf32_size_info
5555 #include "elf32-target.h"