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 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1526 it here if it is defined in a non-shared object. */
1527 if (h->type == STT_GNU_IFUNC
1530 /* It is referenced by a non-shared object. */
1534 /* STT_GNU_IFUNC symbol must go through PLT. */
1535 h->plt.refcount += 1;
1537 /* STT_GNU_IFUNC needs dynamic sections. */
1538 if (htab->elf.dynobj == NULL)
1539 htab->elf.dynobj = abfd;
1544 if (h->root.root.string)
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 STT_GNU_IFUNC "
1551 "symbol `%s' isn't handled by %s"), abfd,
1552 x86_64_elf_howto_table[r_type].name,
1553 name, __FUNCTION__);
1554 bfd_set_error (bfd_error_bad_value);
1558 if (ABI_64_P (abfd))
1562 h->pointer_equality_needed = 1;
1565 /* We must copy these reloc types into the output
1566 file. Create a reloc section in dynobj and
1567 make room for this reloc. */
1568 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1569 (abfd, info, sec, sreloc,
1570 &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs);
1581 if (r_type != R_X86_64_PC32
1582 && r_type != R_X86_64_PC64)
1583 h->pointer_equality_needed = 1;
1586 case R_X86_64_PLT32:
1589 case R_X86_64_GOTPCREL:
1590 case R_X86_64_GOTPCREL64:
1591 h->got.refcount += 1;
1592 if (htab->elf.sgot == NULL
1593 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1603 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1604 symtab_hdr, sym_hashes,
1605 &r_type, GOT_UNKNOWN,
1606 rel, rel_end, h, r_symndx))
1611 case R_X86_64_TLSLD:
1612 htab->tls_ld_got.refcount += 1;
1615 case R_X86_64_TPOFF32:
1616 if (!info->executable && ABI_64_P (abfd))
1619 name = h->root.root.string;
1621 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1623 (*_bfd_error_handler)
1624 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1626 x86_64_elf_howto_table[r_type].name, name);
1627 bfd_set_error (bfd_error_bad_value);
1632 case R_X86_64_GOTTPOFF:
1633 if (!info->executable)
1634 info->flags |= DF_STATIC_TLS;
1637 case R_X86_64_GOT32:
1638 case R_X86_64_GOTPCREL:
1639 case R_X86_64_TLSGD:
1640 case R_X86_64_GOT64:
1641 case R_X86_64_GOTPCREL64:
1642 case R_X86_64_GOTPLT64:
1643 case R_X86_64_GOTPC32_TLSDESC:
1644 case R_X86_64_TLSDESC_CALL:
1645 /* This symbol requires a global offset table entry. */
1647 int tls_type, old_tls_type;
1651 default: tls_type = GOT_NORMAL; break;
1652 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1653 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1654 case R_X86_64_GOTPC32_TLSDESC:
1655 case R_X86_64_TLSDESC_CALL:
1656 tls_type = GOT_TLS_GDESC; break;
1661 if (r_type == R_X86_64_GOTPLT64)
1663 /* This relocation indicates that we also need
1664 a PLT entry, as this is a function. We don't need
1665 a PLT entry for local symbols. */
1667 h->plt.refcount += 1;
1669 h->got.refcount += 1;
1670 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1674 bfd_signed_vma *local_got_refcounts;
1676 /* This is a global offset table entry for a local symbol. */
1677 local_got_refcounts = elf_local_got_refcounts (abfd);
1678 if (local_got_refcounts == NULL)
1682 size = symtab_hdr->sh_info;
1683 size *= sizeof (bfd_signed_vma)
1684 + sizeof (bfd_vma) + sizeof (char);
1685 local_got_refcounts = ((bfd_signed_vma *)
1686 bfd_zalloc (abfd, size));
1687 if (local_got_refcounts == NULL)
1689 elf_local_got_refcounts (abfd) = local_got_refcounts;
1690 elf_x86_64_local_tlsdesc_gotent (abfd)
1691 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1692 elf_x86_64_local_got_tls_type (abfd)
1693 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1695 local_got_refcounts[r_symndx] += 1;
1697 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1700 /* If a TLS symbol is accessed using IE at least once,
1701 there is no point to use dynamic model for it. */
1702 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1703 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1704 || tls_type != GOT_TLS_IE))
1706 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1707 tls_type = old_tls_type;
1708 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1709 && GOT_TLS_GD_ANY_P (tls_type))
1710 tls_type |= old_tls_type;
1714 name = h->root.root.string;
1716 name = bfd_elf_sym_name (abfd, symtab_hdr,
1718 (*_bfd_error_handler)
1719 (_("%B: '%s' accessed both as normal and thread local symbol"),
1725 if (old_tls_type != tls_type)
1728 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1730 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1735 case R_X86_64_GOTOFF64:
1736 case R_X86_64_GOTPC32:
1737 case R_X86_64_GOTPC64:
1739 if (htab->elf.sgot == NULL)
1741 if (htab->elf.dynobj == NULL)
1742 htab->elf.dynobj = abfd;
1743 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1749 case R_X86_64_PLT32:
1750 /* This symbol requires a procedure linkage table entry. We
1751 actually build the entry in adjust_dynamic_symbol,
1752 because this might be a case of linking PIC code which is
1753 never referenced by a dynamic object, in which case we
1754 don't need to generate a procedure linkage table entry
1757 /* If this is a local symbol, we resolve it directly without
1758 creating a procedure linkage table entry. */
1763 h->plt.refcount += 1;
1766 case R_X86_64_PLTOFF64:
1767 /* This tries to form the 'address' of a function relative
1768 to GOT. For global symbols we need a PLT entry. */
1772 h->plt.refcount += 1;
1777 if (!ABI_64_P (abfd))
1782 /* Let's help debug shared library creation. These relocs
1783 cannot be used in shared libs. Don't error out for
1784 sections we don't care about, such as debug sections or
1785 non-constant sections. */
1787 && (sec->flags & SEC_ALLOC) != 0
1788 && (sec->flags & SEC_READONLY) != 0)
1791 name = h->root.root.string;
1793 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1794 (*_bfd_error_handler)
1795 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1796 abfd, x86_64_elf_howto_table[r_type].name, name);
1797 bfd_set_error (bfd_error_bad_value);
1808 if (h != NULL && info->executable)
1810 /* If this reloc is in a read-only section, we might
1811 need a copy reloc. We can't check reliably at this
1812 stage whether the section is read-only, as input
1813 sections have not yet been mapped to output sections.
1814 Tentatively set the flag for now, and correct in
1815 adjust_dynamic_symbol. */
1818 /* We may need a .plt entry if the function this reloc
1819 refers to is in a shared lib. */
1820 h->plt.refcount += 1;
1821 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1822 h->pointer_equality_needed = 1;
1825 /* If we are creating a shared library, and this is a reloc
1826 against a global symbol, or a non PC relative reloc
1827 against a local symbol, then we need to copy the reloc
1828 into the shared library. However, if we are linking with
1829 -Bsymbolic, we do not need to copy a reloc against a
1830 global symbol which is defined in an object we are
1831 including in the link (i.e., DEF_REGULAR is set). At
1832 this point we have not seen all the input files, so it is
1833 possible that DEF_REGULAR is not set now but will be set
1834 later (it is never cleared). In case of a weak definition,
1835 DEF_REGULAR may be cleared later by a strong definition in
1836 a shared library. We account for that possibility below by
1837 storing information in the relocs_copied field of the hash
1838 table entry. A similar situation occurs when creating
1839 shared libraries and symbol visibility changes render the
1842 If on the other hand, we are creating an executable, we
1843 may need to keep relocations for symbols satisfied by a
1844 dynamic library if we manage to avoid copy relocs for the
1847 && (sec->flags & SEC_ALLOC) != 0
1848 && (! IS_X86_64_PCREL_TYPE (r_type)
1850 && (! SYMBOLIC_BIND (info, h)
1851 || h->root.type == bfd_link_hash_defweak
1852 || !h->def_regular))))
1853 || (ELIMINATE_COPY_RELOCS
1855 && (sec->flags & SEC_ALLOC) != 0
1857 && (h->root.type == bfd_link_hash_defweak
1858 || !h->def_regular)))
1860 struct elf_dyn_relocs *p;
1861 struct elf_dyn_relocs **head;
1863 /* We must copy these reloc types into the output file.
1864 Create a reloc section in dynobj and make room for
1868 if (htab->elf.dynobj == NULL)
1869 htab->elf.dynobj = abfd;
1871 sreloc = _bfd_elf_make_dynamic_reloc_section
1872 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1873 abfd, /*rela?*/ TRUE);
1879 /* If this is a global symbol, we count the number of
1880 relocations we need for this symbol. */
1883 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
1887 /* Track dynamic relocs needed for local syms too.
1888 We really need local syms available to do this
1893 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1898 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1902 /* Beware of type punned pointers vs strict aliasing
1904 vpp = &(elf_section_data (s)->local_dynrel);
1905 head = (struct elf_dyn_relocs **)vpp;
1909 if (p == NULL || p->sec != sec)
1911 bfd_size_type amt = sizeof *p;
1913 p = ((struct elf_dyn_relocs *)
1914 bfd_alloc (htab->elf.dynobj, amt));
1925 if (IS_X86_64_PCREL_TYPE (r_type))
1930 /* This relocation describes the C++ object vtable hierarchy.
1931 Reconstruct it for later use during GC. */
1932 case R_X86_64_GNU_VTINHERIT:
1933 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1937 /* This relocation describes which C++ vtable entries are actually
1938 used. Record for later use during GC. */
1939 case R_X86_64_GNU_VTENTRY:
1940 BFD_ASSERT (h != NULL);
1942 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1954 /* Return the section that should be marked against GC for a given
1958 elf_x86_64_gc_mark_hook (asection *sec,
1959 struct bfd_link_info *info,
1960 Elf_Internal_Rela *rel,
1961 struct elf_link_hash_entry *h,
1962 Elf_Internal_Sym *sym)
1965 switch (ELF32_R_TYPE (rel->r_info))
1967 case R_X86_64_GNU_VTINHERIT:
1968 case R_X86_64_GNU_VTENTRY:
1972 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1975 /* Update the got entry reference counts for the section being removed. */
1978 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1980 const Elf_Internal_Rela *relocs)
1982 struct elf_x86_64_link_hash_table *htab;
1983 Elf_Internal_Shdr *symtab_hdr;
1984 struct elf_link_hash_entry **sym_hashes;
1985 bfd_signed_vma *local_got_refcounts;
1986 const Elf_Internal_Rela *rel, *relend;
1988 if (info->relocatable)
1991 htab = elf_x86_64_hash_table (info);
1995 elf_section_data (sec)->local_dynrel = NULL;
1997 symtab_hdr = &elf_symtab_hdr (abfd);
1998 sym_hashes = elf_sym_hashes (abfd);
1999 local_got_refcounts = elf_local_got_refcounts (abfd);
2001 htab = elf_x86_64_hash_table (info);
2002 relend = relocs + sec->reloc_count;
2003 for (rel = relocs; rel < relend; rel++)
2005 unsigned long r_symndx;
2006 unsigned int r_type;
2007 struct elf_link_hash_entry *h = NULL;
2009 r_symndx = htab->r_sym (rel->r_info);
2010 if (r_symndx >= symtab_hdr->sh_info)
2012 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2013 while (h->root.type == bfd_link_hash_indirect
2014 || h->root.type == bfd_link_hash_warning)
2015 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2019 /* A local symbol. */
2020 Elf_Internal_Sym *isym;
2022 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2025 /* Check relocation against local STT_GNU_IFUNC symbol. */
2027 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2029 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2037 struct elf_x86_64_link_hash_entry *eh;
2038 struct elf_dyn_relocs **pp;
2039 struct elf_dyn_relocs *p;
2041 eh = (struct elf_x86_64_link_hash_entry *) h;
2043 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2046 /* Everything must go for SEC. */
2052 r_type = ELF32_R_TYPE (rel->r_info);
2053 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2054 symtab_hdr, sym_hashes,
2055 &r_type, GOT_UNKNOWN,
2056 rel, relend, h, r_symndx))
2061 case R_X86_64_TLSLD:
2062 if (htab->tls_ld_got.refcount > 0)
2063 htab->tls_ld_got.refcount -= 1;
2066 case R_X86_64_TLSGD:
2067 case R_X86_64_GOTPC32_TLSDESC:
2068 case R_X86_64_TLSDESC_CALL:
2069 case R_X86_64_GOTTPOFF:
2070 case R_X86_64_GOT32:
2071 case R_X86_64_GOTPCREL:
2072 case R_X86_64_GOT64:
2073 case R_X86_64_GOTPCREL64:
2074 case R_X86_64_GOTPLT64:
2077 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
2078 h->plt.refcount -= 1;
2079 if (h->got.refcount > 0)
2080 h->got.refcount -= 1;
2081 if (h->type == STT_GNU_IFUNC)
2083 if (h->plt.refcount > 0)
2084 h->plt.refcount -= 1;
2087 else if (local_got_refcounts != NULL)
2089 if (local_got_refcounts[r_symndx] > 0)
2090 local_got_refcounts[r_symndx] -= 1;
2104 && (h == NULL || h->type != STT_GNU_IFUNC))
2108 case R_X86_64_PLT32:
2109 case R_X86_64_PLTOFF64:
2112 if (h->plt.refcount > 0)
2113 h->plt.refcount -= 1;
2125 /* Adjust a symbol defined by a dynamic object and referenced by a
2126 regular object. The current definition is in some section of the
2127 dynamic object, but we're not including those sections. We have to
2128 change the definition to something the rest of the link can
2132 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2133 struct elf_link_hash_entry *h)
2135 struct elf_x86_64_link_hash_table *htab;
2138 /* STT_GNU_IFUNC symbol must go through PLT. */
2139 if (h->type == STT_GNU_IFUNC)
2141 if (h->plt.refcount <= 0)
2143 h->plt.offset = (bfd_vma) -1;
2149 /* If this is a function, put it in the procedure linkage table. We
2150 will fill in the contents of the procedure linkage table later,
2151 when we know the address of the .got section. */
2152 if (h->type == STT_FUNC
2155 if (h->plt.refcount <= 0
2156 || SYMBOL_CALLS_LOCAL (info, h)
2157 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2158 && h->root.type == bfd_link_hash_undefweak))
2160 /* This case can occur if we saw a PLT32 reloc in an input
2161 file, but the symbol was never referred to by a dynamic
2162 object, or if all references were garbage collected. In
2163 such a case, we don't actually need to build a procedure
2164 linkage table, and we can just do a PC32 reloc instead. */
2165 h->plt.offset = (bfd_vma) -1;
2172 /* It's possible that we incorrectly decided a .plt reloc was
2173 needed for an R_X86_64_PC32 reloc to a non-function sym in
2174 check_relocs. We can't decide accurately between function and
2175 non-function syms in check-relocs; Objects loaded later in
2176 the link may change h->type. So fix it now. */
2177 h->plt.offset = (bfd_vma) -1;
2179 /* If this is a weak symbol, and there is a real definition, the
2180 processor independent code will have arranged for us to see the
2181 real definition first, and we can just use the same value. */
2182 if (h->u.weakdef != NULL)
2184 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2185 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2186 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2187 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2188 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2189 h->non_got_ref = h->u.weakdef->non_got_ref;
2193 /* This is a reference to a symbol defined by a dynamic object which
2194 is not a function. */
2196 /* If we are creating a shared library, we must presume that the
2197 only references to the symbol are via the global offset table.
2198 For such cases we need not do anything here; the relocations will
2199 be handled correctly by relocate_section. */
2203 /* If there are no references to this symbol that do not use the
2204 GOT, we don't need to generate a copy reloc. */
2205 if (!h->non_got_ref)
2208 /* If -z nocopyreloc was given, we won't generate them either. */
2209 if (info->nocopyreloc)
2215 if (ELIMINATE_COPY_RELOCS)
2217 struct elf_x86_64_link_hash_entry * eh;
2218 struct elf_dyn_relocs *p;
2220 eh = (struct elf_x86_64_link_hash_entry *) h;
2221 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2223 s = p->sec->output_section;
2224 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2228 /* If we didn't find any dynamic relocs in read-only sections, then
2229 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2237 /* We must allocate the symbol in our .dynbss section, which will
2238 become part of the .bss section of the executable. There will be
2239 an entry for this symbol in the .dynsym section. The dynamic
2240 object will contain position independent code, so all references
2241 from the dynamic object to this symbol will go through the global
2242 offset table. The dynamic linker will use the .dynsym entry to
2243 determine the address it must put in the global offset table, so
2244 both the dynamic object and the regular object will refer to the
2245 same memory location for the variable. */
2247 htab = elf_x86_64_hash_table (info);
2251 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2252 to copy the initial value out of the dynamic object and into the
2253 runtime process image. */
2254 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2256 const struct elf_backend_data *bed;
2257 bed = get_elf_backend_data (info->output_bfd);
2258 htab->srelbss->size += bed->s->sizeof_rela;
2264 return _bfd_elf_adjust_dynamic_copy (h, s);
2267 /* Allocate space in .plt, .got and associated reloc sections for
2271 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2273 struct bfd_link_info *info;
2274 struct elf_x86_64_link_hash_table *htab;
2275 struct elf_x86_64_link_hash_entry *eh;
2276 struct elf_dyn_relocs *p;
2277 const struct elf_backend_data *bed;
2278 unsigned int plt_entry_size;
2280 if (h->root.type == bfd_link_hash_indirect)
2283 eh = (struct elf_x86_64_link_hash_entry *) h;
2285 info = (struct bfd_link_info *) inf;
2286 htab = elf_x86_64_hash_table (info);
2289 bed = get_elf_backend_data (info->output_bfd);
2290 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2292 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2293 here if it is defined and referenced in a non-shared object. */
2294 if (h->type == STT_GNU_IFUNC
2296 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2300 else if (htab->elf.dynamic_sections_created
2301 && h->plt.refcount > 0)
2303 /* Make sure this symbol is output as a dynamic symbol.
2304 Undefined weak syms won't yet be marked as dynamic. */
2305 if (h->dynindx == -1
2306 && !h->forced_local)
2308 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2313 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2315 asection *s = htab->elf.splt;
2317 /* If this is the first .plt entry, make room for the special
2320 s->size += plt_entry_size;
2322 h->plt.offset = s->size;
2324 /* If this symbol is not defined in a regular file, and we are
2325 not generating a shared library, then set the symbol to this
2326 location in the .plt. This is required to make function
2327 pointers compare as equal between the normal executable and
2328 the shared library. */
2332 h->root.u.def.section = s;
2333 h->root.u.def.value = h->plt.offset;
2336 /* Make room for this entry. */
2337 s->size += plt_entry_size;
2339 /* We also need to make an entry in the .got.plt section, which
2340 will be placed in the .got section by the linker script. */
2341 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2343 /* We also need to make an entry in the .rela.plt section. */
2344 htab->elf.srelplt->size += bed->s->sizeof_rela;
2345 htab->elf.srelplt->reloc_count++;
2349 h->plt.offset = (bfd_vma) -1;
2355 h->plt.offset = (bfd_vma) -1;
2359 eh->tlsdesc_got = (bfd_vma) -1;
2361 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2362 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2363 if (h->got.refcount > 0
2366 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2368 h->got.offset = (bfd_vma) -1;
2370 else if (h->got.refcount > 0)
2374 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2376 /* Make sure this symbol is output as a dynamic symbol.
2377 Undefined weak syms won't yet be marked as dynamic. */
2378 if (h->dynindx == -1
2379 && !h->forced_local)
2381 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2385 if (GOT_TLS_GDESC_P (tls_type))
2387 eh->tlsdesc_got = htab->elf.sgotplt->size
2388 - elf_x86_64_compute_jump_table_size (htab);
2389 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2390 h->got.offset = (bfd_vma) -2;
2392 if (! GOT_TLS_GDESC_P (tls_type)
2393 || GOT_TLS_GD_P (tls_type))
2396 h->got.offset = s->size;
2397 s->size += GOT_ENTRY_SIZE;
2398 if (GOT_TLS_GD_P (tls_type))
2399 s->size += GOT_ENTRY_SIZE;
2401 dyn = htab->elf.dynamic_sections_created;
2402 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2404 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2405 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2406 || tls_type == GOT_TLS_IE)
2407 htab->elf.srelgot->size += bed->s->sizeof_rela;
2408 else if (GOT_TLS_GD_P (tls_type))
2409 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2410 else if (! GOT_TLS_GDESC_P (tls_type)
2411 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2412 || h->root.type != bfd_link_hash_undefweak)
2414 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2415 htab->elf.srelgot->size += bed->s->sizeof_rela;
2416 if (GOT_TLS_GDESC_P (tls_type))
2418 htab->elf.srelplt->size += bed->s->sizeof_rela;
2419 htab->tlsdesc_plt = (bfd_vma) -1;
2423 h->got.offset = (bfd_vma) -1;
2425 if (eh->dyn_relocs == NULL)
2428 /* In the shared -Bsymbolic case, discard space allocated for
2429 dynamic pc-relative relocs against symbols which turn out to be
2430 defined in regular objects. For the normal shared case, discard
2431 space for pc-relative relocs that have become local due to symbol
2432 visibility changes. */
2436 /* Relocs that use pc_count are those that appear on a call
2437 insn, or certain REL relocs that can generated via assembly.
2438 We want calls to protected symbols to resolve directly to the
2439 function rather than going via the plt. If people want
2440 function pointer comparisons to work as expected then they
2441 should avoid writing weird assembly. */
2442 if (SYMBOL_CALLS_LOCAL (info, h))
2444 struct elf_dyn_relocs **pp;
2446 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2448 p->count -= p->pc_count;
2457 /* Also discard relocs on undefined weak syms with non-default
2459 if (eh->dyn_relocs != NULL
2460 && h->root.type == bfd_link_hash_undefweak)
2462 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2463 eh->dyn_relocs = NULL;
2465 /* Make sure undefined weak symbols are output as a dynamic
2467 else if (h->dynindx == -1
2468 && ! h->forced_local
2469 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2474 else if (ELIMINATE_COPY_RELOCS)
2476 /* For the non-shared case, discard space for relocs against
2477 symbols which turn out to need copy relocs or are not
2483 || (htab->elf.dynamic_sections_created
2484 && (h->root.type == bfd_link_hash_undefweak
2485 || h->root.type == bfd_link_hash_undefined))))
2487 /* Make sure this symbol is output as a dynamic symbol.
2488 Undefined weak syms won't yet be marked as dynamic. */
2489 if (h->dynindx == -1
2490 && ! h->forced_local
2491 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2494 /* If that succeeded, we know we'll be keeping all the
2496 if (h->dynindx != -1)
2500 eh->dyn_relocs = NULL;
2505 /* Finally, allocate space. */
2506 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2510 sreloc = elf_section_data (p->sec)->sreloc;
2512 BFD_ASSERT (sreloc != NULL);
2514 sreloc->size += p->count * bed->s->sizeof_rela;
2520 /* Allocate space in .plt, .got and associated reloc sections for
2521 local dynamic relocs. */
2524 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2526 struct elf_link_hash_entry *h
2527 = (struct elf_link_hash_entry *) *slot;
2529 if (h->type != STT_GNU_IFUNC
2533 || h->root.type != bfd_link_hash_defined)
2536 return elf_x86_64_allocate_dynrelocs (h, inf);
2539 /* Find any dynamic relocs that apply to read-only sections. */
2542 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2545 struct elf_x86_64_link_hash_entry *eh;
2546 struct elf_dyn_relocs *p;
2548 /* Skip local IFUNC symbols. */
2549 if (h->forced_local && h->type == STT_GNU_IFUNC)
2552 eh = (struct elf_x86_64_link_hash_entry *) h;
2553 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2555 asection *s = p->sec->output_section;
2557 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2559 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2561 info->flags |= DF_TEXTREL;
2563 if (info->warn_shared_textrel && info->shared)
2564 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2565 p->sec->owner, h->root.root.string,
2568 /* Not an error, just cut short the traversal. */
2576 mov foo@GOTPCREL(%rip), %reg
2579 with the local symbol, foo. */
2582 elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
2583 struct bfd_link_info *link_info)
2585 Elf_Internal_Shdr *symtab_hdr;
2586 Elf_Internal_Rela *internal_relocs;
2587 Elf_Internal_Rela *irel, *irelend;
2589 struct elf_x86_64_link_hash_table *htab;
2590 bfd_boolean changed_contents;
2591 bfd_boolean changed_relocs;
2592 bfd_signed_vma *local_got_refcounts;
2594 /* Don't even try to convert non-ELF outputs. */
2595 if (!is_elf_hash_table (link_info->hash))
2598 /* Nothing to do if there are no codes, no relocations or no output. */
2599 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2600 || sec->reloc_count == 0
2601 || discarded_section (sec))
2604 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2606 /* Load the relocations for this section. */
2607 internal_relocs = (_bfd_elf_link_read_relocs
2608 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2609 link_info->keep_memory));
2610 if (internal_relocs == NULL)
2613 htab = elf_x86_64_hash_table (link_info);
2614 changed_contents = FALSE;
2615 changed_relocs = FALSE;
2616 local_got_refcounts = elf_local_got_refcounts (abfd);
2618 /* Get the section contents. */
2619 if (elf_section_data (sec)->this_hdr.contents != NULL)
2620 contents = elf_section_data (sec)->this_hdr.contents;
2623 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2627 irelend = internal_relocs + sec->reloc_count;
2628 for (irel = internal_relocs; irel < irelend; irel++)
2630 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2631 unsigned int r_symndx = htab->r_sym (irel->r_info);
2633 struct elf_link_hash_entry *h;
2635 if (r_type != R_X86_64_GOTPCREL)
2638 /* Get the symbol referred to by the reloc. */
2639 if (r_symndx < symtab_hdr->sh_info)
2641 Elf_Internal_Sym *isym;
2643 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2646 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2647 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2648 && bfd_get_8 (input_bfd,
2649 contents + irel->r_offset - 2) == 0x8b)
2651 bfd_put_8 (output_bfd, 0x8d,
2652 contents + irel->r_offset - 2);
2653 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2654 if (local_got_refcounts != NULL
2655 && local_got_refcounts[r_symndx] > 0)
2656 local_got_refcounts[r_symndx] -= 1;
2657 changed_contents = TRUE;
2658 changed_relocs = TRUE;
2663 indx = r_symndx - symtab_hdr->sh_info;
2664 h = elf_sym_hashes (abfd)[indx];
2665 BFD_ASSERT (h != NULL);
2667 while (h->root.type == bfd_link_hash_indirect
2668 || h->root.type == bfd_link_hash_warning)
2669 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2671 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2672 avoid optimizing _DYNAMIC since ld.so may use its link-time
2675 && h->type != STT_GNU_IFUNC
2676 && h != htab->elf.hdynamic
2677 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2678 && bfd_get_8 (input_bfd,
2679 contents + irel->r_offset - 2) == 0x8b)
2681 bfd_put_8 (output_bfd, 0x8d,
2682 contents + irel->r_offset - 2);
2683 irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
2684 if (h->got.refcount > 0)
2685 h->got.refcount -= 1;
2686 changed_contents = TRUE;
2687 changed_relocs = TRUE;
2691 if (contents != NULL
2692 && elf_section_data (sec)->this_hdr.contents != contents)
2694 if (!changed_contents && !link_info->keep_memory)
2698 /* Cache the section contents for elf_link_input_bfd. */
2699 elf_section_data (sec)->this_hdr.contents = contents;
2703 if (elf_section_data (sec)->relocs != internal_relocs)
2705 if (!changed_relocs)
2706 free (internal_relocs);
2708 elf_section_data (sec)->relocs = internal_relocs;
2714 if (contents != NULL
2715 && elf_section_data (sec)->this_hdr.contents != contents)
2717 if (internal_relocs != NULL
2718 && elf_section_data (sec)->relocs != internal_relocs)
2719 free (internal_relocs);
2723 /* Set the sizes of the dynamic sections. */
2726 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2727 struct bfd_link_info *info)
2729 struct elf_x86_64_link_hash_table *htab;
2734 const struct elf_backend_data *bed;
2736 htab = elf_x86_64_hash_table (info);
2739 bed = get_elf_backend_data (output_bfd);
2741 dynobj = htab->elf.dynobj;
2745 if (htab->elf.dynamic_sections_created)
2747 /* Set the contents of the .interp section to the interpreter. */
2748 if (info->executable)
2750 s = bfd_get_linker_section (dynobj, ".interp");
2753 s->size = htab->dynamic_interpreter_size;
2754 s->contents = (unsigned char *) htab->dynamic_interpreter;
2758 /* Set up .got offsets for local syms, and space for local dynamic
2760 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2762 bfd_signed_vma *local_got;
2763 bfd_signed_vma *end_local_got;
2764 char *local_tls_type;
2765 bfd_vma *local_tlsdesc_gotent;
2766 bfd_size_type locsymcount;
2767 Elf_Internal_Shdr *symtab_hdr;
2770 if (! is_x86_64_elf (ibfd))
2773 for (s = ibfd->sections; s != NULL; s = s->next)
2775 struct elf_dyn_relocs *p;
2777 if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
2780 for (p = (struct elf_dyn_relocs *)
2781 (elf_section_data (s)->local_dynrel);
2785 if (!bfd_is_abs_section (p->sec)
2786 && bfd_is_abs_section (p->sec->output_section))
2788 /* Input section has been discarded, either because
2789 it is a copy of a linkonce section or due to
2790 linker script /DISCARD/, so we'll be discarding
2793 else if (p->count != 0)
2795 srel = elf_section_data (p->sec)->sreloc;
2796 srel->size += p->count * bed->s->sizeof_rela;
2797 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2798 && (info->flags & DF_TEXTREL) == 0)
2800 info->flags |= DF_TEXTREL;
2801 if (info->warn_shared_textrel && info->shared)
2802 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2803 p->sec->owner, p->sec);
2809 local_got = elf_local_got_refcounts (ibfd);
2813 symtab_hdr = &elf_symtab_hdr (ibfd);
2814 locsymcount = symtab_hdr->sh_info;
2815 end_local_got = local_got + locsymcount;
2816 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
2817 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
2819 srel = htab->elf.srelgot;
2820 for (; local_got < end_local_got;
2821 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2823 *local_tlsdesc_gotent = (bfd_vma) -1;
2826 if (GOT_TLS_GDESC_P (*local_tls_type))
2828 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2829 - elf_x86_64_compute_jump_table_size (htab);
2830 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2831 *local_got = (bfd_vma) -2;
2833 if (! GOT_TLS_GDESC_P (*local_tls_type)
2834 || GOT_TLS_GD_P (*local_tls_type))
2836 *local_got = s->size;
2837 s->size += GOT_ENTRY_SIZE;
2838 if (GOT_TLS_GD_P (*local_tls_type))
2839 s->size += GOT_ENTRY_SIZE;
2842 || GOT_TLS_GD_ANY_P (*local_tls_type)
2843 || *local_tls_type == GOT_TLS_IE)
2845 if (GOT_TLS_GDESC_P (*local_tls_type))
2847 htab->elf.srelplt->size
2848 += bed->s->sizeof_rela;
2849 htab->tlsdesc_plt = (bfd_vma) -1;
2851 if (! GOT_TLS_GDESC_P (*local_tls_type)
2852 || GOT_TLS_GD_P (*local_tls_type))
2853 srel->size += bed->s->sizeof_rela;
2857 *local_got = (bfd_vma) -1;
2861 if (htab->tls_ld_got.refcount > 0)
2863 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2865 htab->tls_ld_got.offset = htab->elf.sgot->size;
2866 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2867 htab->elf.srelgot->size += bed->s->sizeof_rela;
2870 htab->tls_ld_got.offset = -1;
2872 /* Allocate global sym .plt and .got entries, and space for global
2873 sym dynamic relocs. */
2874 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
2877 /* Allocate .plt and .got entries, and space for local symbols. */
2878 htab_traverse (htab->loc_hash_table,
2879 elf_x86_64_allocate_local_dynrelocs,
2882 /* For every jump slot reserved in the sgotplt, reloc_count is
2883 incremented. However, when we reserve space for TLS descriptors,
2884 it's not incremented, so in order to compute the space reserved
2885 for them, it suffices to multiply the reloc count by the jump
2888 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2889 so that R_X86_64_IRELATIVE entries come last. */
2890 if (htab->elf.srelplt)
2892 htab->sgotplt_jump_table_size
2893 = elf_x86_64_compute_jump_table_size (htab);
2894 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2896 else if (htab->elf.irelplt)
2897 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2899 if (htab->tlsdesc_plt)
2901 /* If we're not using lazy TLS relocations, don't generate the
2902 PLT and GOT entries they require. */
2903 if ((info->flags & DF_BIND_NOW))
2904 htab->tlsdesc_plt = 0;
2907 htab->tlsdesc_got = htab->elf.sgot->size;
2908 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2909 /* Reserve room for the initial entry.
2910 FIXME: we could probably do away with it in this case. */
2911 if (htab->elf.splt->size == 0)
2912 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2913 htab->tlsdesc_plt = htab->elf.splt->size;
2914 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
2918 if (htab->elf.sgotplt)
2920 struct elf_link_hash_entry *got;
2921 got = elf_link_hash_lookup (elf_hash_table (info),
2922 "_GLOBAL_OFFSET_TABLE_",
2923 FALSE, FALSE, FALSE);
2925 /* Don't allocate .got.plt section if there are no GOT nor PLT
2926 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2928 || !got->ref_regular_nonweak)
2929 && (htab->elf.sgotplt->size
2930 == get_elf_backend_data (output_bfd)->got_header_size)
2931 && (htab->elf.splt == NULL
2932 || htab->elf.splt->size == 0)
2933 && (htab->elf.sgot == NULL
2934 || htab->elf.sgot->size == 0)
2935 && (htab->elf.iplt == NULL
2936 || htab->elf.iplt->size == 0)
2937 && (htab->elf.igotplt == NULL
2938 || htab->elf.igotplt->size == 0))
2939 htab->elf.sgotplt->size = 0;
2942 if (htab->plt_eh_frame != NULL
2943 && htab->elf.splt != NULL
2944 && htab->elf.splt->size != 0
2945 && !bfd_is_abs_section (htab->elf.splt->output_section)
2946 && _bfd_elf_eh_frame_present (info))
2948 const struct elf_x86_64_backend_data *arch_data
2949 = (const struct elf_x86_64_backend_data *) bed->arch_data;
2950 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
2953 /* We now have determined the sizes of the various dynamic sections.
2954 Allocate memory for them. */
2956 for (s = dynobj->sections; s != NULL; s = s->next)
2958 if ((s->flags & SEC_LINKER_CREATED) == 0)
2961 if (s == htab->elf.splt
2962 || s == htab->elf.sgot
2963 || s == htab->elf.sgotplt
2964 || s == htab->elf.iplt
2965 || s == htab->elf.igotplt
2966 || s == htab->plt_eh_frame
2967 || s == htab->sdynbss)
2969 /* Strip this section if we don't need it; see the
2972 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2974 if (s->size != 0 && s != htab->elf.srelplt)
2977 /* We use the reloc_count field as a counter if we need
2978 to copy relocs into the output file. */
2979 if (s != htab->elf.srelplt)
2984 /* It's not one of our sections, so don't allocate space. */
2990 /* If we don't need this section, strip it from the
2991 output file. This is mostly to handle .rela.bss and
2992 .rela.plt. We must create both sections in
2993 create_dynamic_sections, because they must be created
2994 before the linker maps input sections to output
2995 sections. The linker does that before
2996 adjust_dynamic_symbol is called, and it is that
2997 function which decides whether anything needs to go
2998 into these sections. */
3000 s->flags |= SEC_EXCLUDE;
3004 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3007 /* Allocate memory for the section contents. We use bfd_zalloc
3008 here in case unused entries are not reclaimed before the
3009 section's contents are written out. This should not happen,
3010 but this way if it does, we get a R_X86_64_NONE reloc instead
3012 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3013 if (s->contents == NULL)
3017 if (htab->plt_eh_frame != NULL
3018 && htab->plt_eh_frame->contents != NULL)
3020 const struct elf_x86_64_backend_data *arch_data
3021 = (const struct elf_x86_64_backend_data *) bed->arch_data;
3023 memcpy (htab->plt_eh_frame->contents,
3024 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3025 bfd_put_32 (dynobj, htab->elf.splt->size,
3026 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3029 if (htab->elf.dynamic_sections_created)
3031 /* Add some entries to the .dynamic section. We fill in the
3032 values later, in elf_x86_64_finish_dynamic_sections, but we
3033 must add the entries now so that we get the correct size for
3034 the .dynamic section. The DT_DEBUG entry is filled in by the
3035 dynamic linker and used by the debugger. */
3036 #define add_dynamic_entry(TAG, VAL) \
3037 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3039 if (info->executable)
3041 if (!add_dynamic_entry (DT_DEBUG, 0))
3045 if (htab->elf.splt->size != 0)
3047 if (!add_dynamic_entry (DT_PLTGOT, 0)
3048 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3049 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3050 || !add_dynamic_entry (DT_JMPREL, 0))
3053 if (htab->tlsdesc_plt
3054 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3055 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3061 if (!add_dynamic_entry (DT_RELA, 0)
3062 || !add_dynamic_entry (DT_RELASZ, 0)
3063 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3066 /* If any dynamic relocs apply to a read-only section,
3067 then we need a DT_TEXTREL entry. */
3068 if ((info->flags & DF_TEXTREL) == 0)
3069 elf_link_hash_traverse (&htab->elf,
3070 elf_x86_64_readonly_dynrelocs,
3073 if ((info->flags & DF_TEXTREL) != 0)
3075 if (!add_dynamic_entry (DT_TEXTREL, 0))
3080 #undef add_dynamic_entry
3086 elf_x86_64_always_size_sections (bfd *output_bfd,
3087 struct bfd_link_info *info)
3089 asection *tls_sec = elf_hash_table (info)->tls_sec;
3093 struct elf_link_hash_entry *tlsbase;
3095 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3096 "_TLS_MODULE_BASE_",
3097 FALSE, FALSE, FALSE);
3099 if (tlsbase && tlsbase->type == STT_TLS)
3101 struct elf_x86_64_link_hash_table *htab;
3102 struct bfd_link_hash_entry *bh = NULL;
3103 const struct elf_backend_data *bed
3104 = get_elf_backend_data (output_bfd);
3106 htab = elf_x86_64_hash_table (info);
3110 if (!(_bfd_generic_link_add_one_symbol
3111 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3112 tls_sec, 0, NULL, FALSE,
3113 bed->collect, &bh)))
3116 htab->tls_module_base = bh;
3118 tlsbase = (struct elf_link_hash_entry *)bh;
3119 tlsbase->def_regular = 1;
3120 tlsbase->other = STV_HIDDEN;
3121 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3128 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3129 executables. Rather than setting it to the beginning of the TLS
3130 section, we have to set it to the end. This function may be called
3131 multiple times, it is idempotent. */
3134 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3136 struct elf_x86_64_link_hash_table *htab;
3137 struct bfd_link_hash_entry *base;
3139 if (!info->executable)
3142 htab = elf_x86_64_hash_table (info);
3146 base = htab->tls_module_base;
3150 base->u.def.value = htab->elf.tls_size;
3153 /* Return the base VMA address which should be subtracted from real addresses
3154 when resolving @dtpoff relocation.
3155 This is PT_TLS segment p_vaddr. */
3158 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3160 /* If tls_sec is NULL, we should have signalled an error already. */
3161 if (elf_hash_table (info)->tls_sec == NULL)
3163 return elf_hash_table (info)->tls_sec->vma;
3166 /* Return the relocation value for @tpoff relocation
3167 if STT_TLS virtual address is ADDRESS. */
3170 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3172 struct elf_link_hash_table *htab = elf_hash_table (info);
3173 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3174 bfd_vma static_tls_size;
3176 /* If tls_segment is NULL, we should have signalled an error already. */
3177 if (htab->tls_sec == NULL)
3180 /* Consider special static TLS alignment requirements. */
3181 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3182 return address - static_tls_size - htab->tls_sec->vma;
3185 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3189 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3191 /* Opcode Instruction
3194 0x0f 0x8x conditional jump */
3196 && (contents [offset - 1] == 0xe8
3197 || contents [offset - 1] == 0xe9))
3199 && contents [offset - 2] == 0x0f
3200 && (contents [offset - 1] & 0xf0) == 0x80));
3203 /* Relocate an x86_64 ELF section. */
3206 elf_x86_64_relocate_section (bfd *output_bfd,
3207 struct bfd_link_info *info,
3209 asection *input_section,
3211 Elf_Internal_Rela *relocs,
3212 Elf_Internal_Sym *local_syms,
3213 asection **local_sections)
3215 struct elf_x86_64_link_hash_table *htab;
3216 Elf_Internal_Shdr *symtab_hdr;
3217 struct elf_link_hash_entry **sym_hashes;
3218 bfd_vma *local_got_offsets;
3219 bfd_vma *local_tlsdesc_gotents;
3220 Elf_Internal_Rela *rel;
3221 Elf_Internal_Rela *relend;
3222 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3224 BFD_ASSERT (is_x86_64_elf (input_bfd));
3226 htab = elf_x86_64_hash_table (info);
3229 symtab_hdr = &elf_symtab_hdr (input_bfd);
3230 sym_hashes = elf_sym_hashes (input_bfd);
3231 local_got_offsets = elf_local_got_offsets (input_bfd);
3232 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3234 elf_x86_64_set_tls_module_base (info);
3237 relend = relocs + input_section->reloc_count;
3238 for (; rel < relend; rel++)
3240 unsigned int r_type;
3241 reloc_howto_type *howto;
3242 unsigned long r_symndx;
3243 struct elf_link_hash_entry *h;
3244 Elf_Internal_Sym *sym;
3246 bfd_vma off, offplt;
3248 bfd_boolean unresolved_reloc;
3249 bfd_reloc_status_type r;
3253 r_type = ELF32_R_TYPE (rel->r_info);
3254 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3255 || r_type == (int) R_X86_64_GNU_VTENTRY)
3258 if (r_type >= R_X86_64_max)
3260 bfd_set_error (bfd_error_bad_value);
3264 if (r_type != (int) R_X86_64_32
3265 || ABI_64_P (output_bfd))
3266 howto = x86_64_elf_howto_table + r_type;
3268 howto = (x86_64_elf_howto_table
3269 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3270 r_symndx = htab->r_sym (rel->r_info);
3274 unresolved_reloc = FALSE;
3275 if (r_symndx < symtab_hdr->sh_info)
3277 sym = local_syms + r_symndx;
3278 sec = local_sections[r_symndx];
3280 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3283 /* Relocate against local STT_GNU_IFUNC symbol. */
3284 if (!info->relocatable
3285 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3287 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3292 /* Set STT_GNU_IFUNC symbol value. */
3293 h->root.u.def.value = sym->st_value;
3294 h->root.u.def.section = sec;
3299 bfd_boolean warned ATTRIBUTE_UNUSED;
3301 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3302 r_symndx, symtab_hdr, sym_hashes,
3304 unresolved_reloc, warned);
3307 if (sec != NULL && discarded_section (sec))
3308 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3309 rel, 1, relend, howto, 0, contents);
3311 if (info->relocatable)
3314 if (rel->r_addend == 0
3315 && r_type == R_X86_64_64
3316 && !ABI_64_P (output_bfd))
3318 /* For x32, treat R_X86_64_64 like R_X86_64_32 and zero-extend
3319 it to 64bit if addend is zero. */
3320 r_type = R_X86_64_32;
3321 memset (contents + rel->r_offset + 4, 0, 4);
3324 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3325 it here if it is defined in a non-shared object. */
3327 && h->type == STT_GNU_IFUNC
3334 if ((input_section->flags & SEC_ALLOC) == 0
3335 || h->plt.offset == (bfd_vma) -1)
3338 /* STT_GNU_IFUNC symbol must go through PLT. */
3339 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3340 relocation = (plt->output_section->vma
3341 + plt->output_offset + h->plt.offset);
3346 if (h->root.root.string)
3347 name = h->root.root.string;
3349 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3351 (*_bfd_error_handler)
3352 (_("%B: relocation %s against STT_GNU_IFUNC "
3353 "symbol `%s' isn't handled by %s"), input_bfd,
3354 x86_64_elf_howto_table[r_type].name,
3355 name, __FUNCTION__);
3356 bfd_set_error (bfd_error_bad_value);
3365 if (ABI_64_P (output_bfd))
3369 if (rel->r_addend != 0)
3371 if (h->root.root.string)
3372 name = h->root.root.string;
3374 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3376 (*_bfd_error_handler)
3377 (_("%B: relocation %s against STT_GNU_IFUNC "
3378 "symbol `%s' has non-zero addend: %d"),
3379 input_bfd, x86_64_elf_howto_table[r_type].name,
3380 name, rel->r_addend);
3381 bfd_set_error (bfd_error_bad_value);
3385 /* Generate dynamic relcoation only when there is a
3386 non-GOT reference in a shared object. */
3387 if (info->shared && h->non_got_ref)
3389 Elf_Internal_Rela outrel;
3392 /* Need a dynamic relocation to get the real function
3394 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3398 if (outrel.r_offset == (bfd_vma) -1
3399 || outrel.r_offset == (bfd_vma) -2)
3402 outrel.r_offset += (input_section->output_section->vma
3403 + input_section->output_offset);
3405 if (h->dynindx == -1
3407 || info->executable)
3409 /* This symbol is resolved locally. */
3410 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3411 outrel.r_addend = (h->root.u.def.value
3412 + h->root.u.def.section->output_section->vma
3413 + h->root.u.def.section->output_offset);
3417 outrel.r_info = htab->r_info (h->dynindx, r_type);
3418 outrel.r_addend = 0;
3421 sreloc = htab->elf.irelifunc;
3422 elf_append_rela (output_bfd, sreloc, &outrel);
3424 /* If this reloc is against an external symbol, we
3425 do not want to fiddle with the addend. Otherwise,
3426 we need to include the symbol value so that it
3427 becomes an addend for the dynamic reloc. For an
3428 internal symbol, we have updated addend. */
3434 case R_X86_64_PLT32:
3437 case R_X86_64_GOTPCREL:
3438 case R_X86_64_GOTPCREL64:
3439 base_got = htab->elf.sgot;
3440 off = h->got.offset;
3442 if (base_got == NULL)
3445 if (off == (bfd_vma) -1)
3447 /* We can't use h->got.offset here to save state, or
3448 even just remember the offset, as finish_dynamic_symbol
3449 would use that as offset into .got. */
3451 if (htab->elf.splt != NULL)
3453 plt_index = h->plt.offset / plt_entry_size - 1;
3454 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3455 base_got = htab->elf.sgotplt;
3459 plt_index = h->plt.offset / plt_entry_size;
3460 off = plt_index * GOT_ENTRY_SIZE;
3461 base_got = htab->elf.igotplt;
3464 if (h->dynindx == -1
3468 /* This references the local defitionion. We must
3469 initialize this entry in the global offset table.
3470 Since the offset must always be a multiple of 8,
3471 we use the least significant bit to record
3472 whether we have initialized it already.
3474 When doing a dynamic link, we create a .rela.got
3475 relocation entry to initialize the value. This
3476 is done in the finish_dynamic_symbol routine. */
3481 bfd_put_64 (output_bfd, relocation,
3482 base_got->contents + off);
3483 /* Note that this is harmless for the GOTPLT64
3484 case, as -1 | 1 still is -1. */
3490 relocation = (base_got->output_section->vma
3491 + base_got->output_offset + off);
3497 /* When generating a shared object, the relocations handled here are
3498 copied into the output file to be resolved at run time. */
3501 case R_X86_64_GOT32:
3502 case R_X86_64_GOT64:
3503 /* Relocation is to the entry for this symbol in the global
3505 case R_X86_64_GOTPCREL:
3506 case R_X86_64_GOTPCREL64:
3507 /* Use global offset table entry as symbol value. */
3508 case R_X86_64_GOTPLT64:
3509 /* This is the same as GOT64 for relocation purposes, but
3510 indicates the existence of a PLT entry. The difficulty is,
3511 that we must calculate the GOT slot offset from the PLT
3512 offset, if this symbol got a PLT entry (it was global).
3513 Additionally if it's computed from the PLT entry, then that
3514 GOT offset is relative to .got.plt, not to .got. */
3515 base_got = htab->elf.sgot;
3517 if (htab->elf.sgot == NULL)
3524 off = h->got.offset;
3526 && h->plt.offset != (bfd_vma)-1
3527 && off == (bfd_vma)-1)
3529 /* We can't use h->got.offset here to save
3530 state, or even just remember the offset, as
3531 finish_dynamic_symbol would use that as offset into
3533 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
3534 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3535 base_got = htab->elf.sgotplt;
3538 dyn = htab->elf.dynamic_sections_created;
3540 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3542 && SYMBOL_REFERENCES_LOCAL (info, h))
3543 || (ELF_ST_VISIBILITY (h->other)
3544 && h->root.type == bfd_link_hash_undefweak))
3546 /* This is actually a static link, or it is a -Bsymbolic
3547 link and the symbol is defined locally, or the symbol
3548 was forced to be local because of a version file. We
3549 must initialize this entry in the global offset table.
3550 Since the offset must always be a multiple of 8, we
3551 use the least significant bit to record whether we
3552 have initialized it already.
3554 When doing a dynamic link, we create a .rela.got
3555 relocation entry to initialize the value. This is
3556 done in the finish_dynamic_symbol routine. */
3561 bfd_put_64 (output_bfd, relocation,
3562 base_got->contents + off);
3563 /* Note that this is harmless for the GOTPLT64 case,
3564 as -1 | 1 still is -1. */
3569 unresolved_reloc = FALSE;
3573 if (local_got_offsets == NULL)
3576 off = local_got_offsets[r_symndx];
3578 /* The offset must always be a multiple of 8. We use
3579 the least significant bit to record whether we have
3580 already generated the necessary reloc. */
3585 bfd_put_64 (output_bfd, relocation,
3586 base_got->contents + off);
3591 Elf_Internal_Rela outrel;
3593 /* We need to generate a R_X86_64_RELATIVE reloc
3594 for the dynamic linker. */
3595 s = htab->elf.srelgot;
3599 outrel.r_offset = (base_got->output_section->vma
3600 + base_got->output_offset
3602 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3603 outrel.r_addend = relocation;
3604 elf_append_rela (output_bfd, s, &outrel);
3607 local_got_offsets[r_symndx] |= 1;
3611 if (off >= (bfd_vma) -2)
3614 relocation = base_got->output_section->vma
3615 + base_got->output_offset + off;
3616 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3617 relocation -= htab->elf.sgotplt->output_section->vma
3618 - htab->elf.sgotplt->output_offset;
3622 case R_X86_64_GOTOFF64:
3623 /* Relocation is relative to the start of the global offset
3626 /* Check to make sure it isn't a protected function symbol
3627 for shared library since it may not be local when used
3628 as function address. */
3629 if (!info->executable
3631 && !SYMBOLIC_BIND (info, h)
3633 && h->type == STT_FUNC
3634 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3636 (*_bfd_error_handler)
3637 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3638 input_bfd, h->root.root.string);
3639 bfd_set_error (bfd_error_bad_value);
3643 /* Note that sgot is not involved in this
3644 calculation. We always want the start of .got.plt. If we
3645 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3646 permitted by the ABI, we might have to change this
3648 relocation -= htab->elf.sgotplt->output_section->vma
3649 + htab->elf.sgotplt->output_offset;
3652 case R_X86_64_GOTPC32:
3653 case R_X86_64_GOTPC64:
3654 /* Use global offset table as symbol value. */
3655 relocation = htab->elf.sgotplt->output_section->vma
3656 + htab->elf.sgotplt->output_offset;
3657 unresolved_reloc = FALSE;
3660 case R_X86_64_PLTOFF64:
3661 /* Relocation is PLT entry relative to GOT. For local
3662 symbols it's the symbol itself relative to GOT. */
3664 /* See PLT32 handling. */
3665 && h->plt.offset != (bfd_vma) -1
3666 && htab->elf.splt != NULL)
3668 relocation = (htab->elf.splt->output_section->vma
3669 + htab->elf.splt->output_offset
3671 unresolved_reloc = FALSE;
3674 relocation -= htab->elf.sgotplt->output_section->vma
3675 + htab->elf.sgotplt->output_offset;
3678 case R_X86_64_PLT32:
3679 /* Relocation is to the entry for this symbol in the
3680 procedure linkage table. */
3682 /* Resolve a PLT32 reloc against a local symbol directly,
3683 without using the procedure linkage table. */
3687 if (h->plt.offset == (bfd_vma) -1
3688 || htab->elf.splt == NULL)
3690 /* We didn't make a PLT entry for this symbol. This
3691 happens when statically linking PIC code, or when
3692 using -Bsymbolic. */
3696 relocation = (htab->elf.splt->output_section->vma
3697 + htab->elf.splt->output_offset
3699 unresolved_reloc = FALSE;
3706 && (input_section->flags & SEC_ALLOC) != 0
3707 && (input_section->flags & SEC_READONLY) != 0
3710 bfd_boolean fail = FALSE;
3712 = (r_type == R_X86_64_PC32
3713 && is_32bit_relative_branch (contents, rel->r_offset));
3715 if (SYMBOL_REFERENCES_LOCAL (info, h))
3717 /* Symbol is referenced locally. Make sure it is
3718 defined locally or for a branch. */
3719 fail = !h->def_regular && !branch;
3723 /* Symbol isn't referenced locally. We only allow
3724 branch to symbol with non-default visibility. */
3726 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3733 const char *pic = "";
3735 switch (ELF_ST_VISIBILITY (h->other))
3738 v = _("hidden symbol");
3741 v = _("internal symbol");
3744 v = _("protected symbol");
3748 pic = _("; recompile with -fPIC");
3753 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3755 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3757 (*_bfd_error_handler) (fmt, input_bfd,
3758 x86_64_elf_howto_table[r_type].name,
3759 v, h->root.root.string, pic);
3760 bfd_set_error (bfd_error_bad_value);
3771 /* FIXME: The ABI says the linker should make sure the value is
3772 the same when it's zeroextended to 64 bit. */
3774 if ((input_section->flags & SEC_ALLOC) == 0)
3779 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3780 || h->root.type != bfd_link_hash_undefweak)
3781 && (! IS_X86_64_PCREL_TYPE (r_type)
3782 || ! SYMBOL_CALLS_LOCAL (info, h)))
3783 || (ELIMINATE_COPY_RELOCS
3790 || h->root.type == bfd_link_hash_undefweak
3791 || h->root.type == bfd_link_hash_undefined)))
3793 Elf_Internal_Rela outrel;
3794 bfd_boolean skip, relocate;
3797 /* When generating a shared object, these relocations
3798 are copied into the output file to be resolved at run
3804 _bfd_elf_section_offset (output_bfd, info, input_section,
3806 if (outrel.r_offset == (bfd_vma) -1)
3808 else if (outrel.r_offset == (bfd_vma) -2)
3809 skip = TRUE, relocate = TRUE;
3811 outrel.r_offset += (input_section->output_section->vma
3812 + input_section->output_offset);
3815 memset (&outrel, 0, sizeof outrel);
3817 /* h->dynindx may be -1 if this symbol was marked to
3821 && (IS_X86_64_PCREL_TYPE (r_type)
3823 || ! SYMBOLIC_BIND (info, h)
3824 || ! h->def_regular))
3826 outrel.r_info = htab->r_info (h->dynindx, r_type);
3827 outrel.r_addend = rel->r_addend;
3831 /* This symbol is local, or marked to become local. */
3832 if (r_type == htab->pointer_r_type)
3835 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3836 outrel.r_addend = relocation + rel->r_addend;
3838 else if (r_type == R_X86_64_64
3839 && !ABI_64_P (output_bfd))
3842 outrel.r_info = htab->r_info (0,
3843 R_X86_64_RELATIVE64);
3844 outrel.r_addend = relocation + rel->r_addend;
3845 /* Check addend overflow. */
3846 if ((outrel.r_addend & 0x80000000)
3847 != (rel->r_addend & 0x80000000))
3850 int addend = rel->r_addend;
3851 if (h && h->root.root.string)
3852 name = h->root.root.string;
3854 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3857 (*_bfd_error_handler)
3858 (_("%B: addend -0x%x in relocation %s against "
3859 "symbol `%s' at 0x%lx in section `%A' is "
3861 input_bfd, input_section, addend,
3862 x86_64_elf_howto_table[r_type].name,
3863 name, (unsigned long) rel->r_offset);
3865 (*_bfd_error_handler)
3866 (_("%B: addend 0x%x in relocation %s against "
3867 "symbol `%s' at 0x%lx in section `%A' is "
3869 input_bfd, input_section, addend,
3870 x86_64_elf_howto_table[r_type].name,
3871 name, (unsigned long) rel->r_offset);
3872 bfd_set_error (bfd_error_bad_value);
3880 if (bfd_is_abs_section (sec))
3882 else if (sec == NULL || sec->owner == NULL)
3884 bfd_set_error (bfd_error_bad_value);
3891 /* We are turning this relocation into one
3892 against a section symbol. It would be
3893 proper to subtract the symbol's value,
3894 osec->vma, from the emitted reloc addend,
3895 but ld.so expects buggy relocs. */
3896 osec = sec->output_section;
3897 sindx = elf_section_data (osec)->dynindx;
3900 asection *oi = htab->elf.text_index_section;
3901 sindx = elf_section_data (oi)->dynindx;
3903 BFD_ASSERT (sindx != 0);
3906 outrel.r_info = htab->r_info (sindx, r_type);
3907 outrel.r_addend = relocation + rel->r_addend;
3911 sreloc = elf_section_data (input_section)->sreloc;
3913 if (sreloc == NULL || sreloc->contents == NULL)
3915 r = bfd_reloc_notsupported;
3916 goto check_relocation_error;
3919 elf_append_rela (output_bfd, sreloc, &outrel);
3921 /* If this reloc is against an external symbol, we do
3922 not want to fiddle with the addend. Otherwise, we
3923 need to include the symbol value so that it becomes
3924 an addend for the dynamic reloc. */
3931 case R_X86_64_TLSGD:
3932 case R_X86_64_GOTPC32_TLSDESC:
3933 case R_X86_64_TLSDESC_CALL:
3934 case R_X86_64_GOTTPOFF:
3935 tls_type = GOT_UNKNOWN;
3936 if (h == NULL && local_got_offsets)
3937 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3939 tls_type = elf_x86_64_hash_entry (h)->tls_type;
3941 if (! elf_x86_64_tls_transition (info, input_bfd,
3942 input_section, contents,
3943 symtab_hdr, sym_hashes,
3944 &r_type, tls_type, rel,
3945 relend, h, r_symndx))
3948 if (r_type == R_X86_64_TPOFF32)
3950 bfd_vma roff = rel->r_offset;
3952 BFD_ASSERT (! unresolved_reloc);
3954 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3956 /* GD->LE transition. For 64bit, change
3957 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3958 .word 0x6666; rex64; call __tls_get_addr
3961 leaq foo@tpoff(%rax), %rax
3963 leaq foo@tlsgd(%rip), %rdi
3964 .word 0x6666; rex64; call __tls_get_addr
3967 leaq foo@tpoff(%rax), %rax */
3968 if (ABI_64_P (output_bfd))
3969 memcpy (contents + roff - 4,
3970 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3973 memcpy (contents + roff - 3,
3974 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3976 bfd_put_32 (output_bfd,
3977 elf_x86_64_tpoff (info, relocation),
3978 contents + roff + 8);
3979 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3983 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3985 /* GDesc -> LE transition.
3986 It's originally something like:
3987 leaq x@tlsdesc(%rip), %rax
3990 movl $x@tpoff, %rax. */
3992 unsigned int val, type;
3994 type = bfd_get_8 (input_bfd, contents + roff - 3);
3995 val = bfd_get_8 (input_bfd, contents + roff - 1);
3996 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3997 contents + roff - 3);
3998 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3999 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4000 contents + roff - 1);
4001 bfd_put_32 (output_bfd,
4002 elf_x86_64_tpoff (info, relocation),
4006 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4008 /* GDesc -> LE transition.
4013 bfd_put_8 (output_bfd, 0x66, contents + roff);
4014 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4017 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4019 /* IE->LE transition:
4020 Originally it can be one of:
4021 movq foo@gottpoff(%rip), %reg
4022 addq foo@gottpoff(%rip), %reg
4025 leaq foo(%reg), %reg
4028 unsigned int val, type, reg;
4030 val = bfd_get_8 (input_bfd, contents + roff - 3);
4031 type = bfd_get_8 (input_bfd, contents + roff - 2);
4032 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4038 bfd_put_8 (output_bfd, 0x49,
4039 contents + roff - 3);
4040 else if (!ABI_64_P (output_bfd) && val == 0x44)
4041 bfd_put_8 (output_bfd, 0x41,
4042 contents + roff - 3);
4043 bfd_put_8 (output_bfd, 0xc7,
4044 contents + roff - 2);
4045 bfd_put_8 (output_bfd, 0xc0 | reg,
4046 contents + roff - 1);
4050 /* addq -> addq - addressing with %rsp/%r12 is
4053 bfd_put_8 (output_bfd, 0x49,
4054 contents + roff - 3);
4055 else if (!ABI_64_P (output_bfd) && val == 0x44)
4056 bfd_put_8 (output_bfd, 0x41,
4057 contents + roff - 3);
4058 bfd_put_8 (output_bfd, 0x81,
4059 contents + roff - 2);
4060 bfd_put_8 (output_bfd, 0xc0 | reg,
4061 contents + roff - 1);
4067 bfd_put_8 (output_bfd, 0x4d,
4068 contents + roff - 3);
4069 else if (!ABI_64_P (output_bfd) && val == 0x44)
4070 bfd_put_8 (output_bfd, 0x45,
4071 contents + roff - 3);
4072 bfd_put_8 (output_bfd, 0x8d,
4073 contents + roff - 2);
4074 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4075 contents + roff - 1);
4077 bfd_put_32 (output_bfd,
4078 elf_x86_64_tpoff (info, relocation),
4086 if (htab->elf.sgot == NULL)
4091 off = h->got.offset;
4092 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4096 if (local_got_offsets == NULL)
4099 off = local_got_offsets[r_symndx];
4100 offplt = local_tlsdesc_gotents[r_symndx];
4107 Elf_Internal_Rela outrel;
4111 if (htab->elf.srelgot == NULL)
4114 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4116 if (GOT_TLS_GDESC_P (tls_type))
4118 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4119 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4120 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4121 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4122 + htab->elf.sgotplt->output_offset
4124 + htab->sgotplt_jump_table_size);
4125 sreloc = htab->elf.srelplt;
4127 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4129 outrel.r_addend = 0;
4130 elf_append_rela (output_bfd, sreloc, &outrel);
4133 sreloc = htab->elf.srelgot;
4135 outrel.r_offset = (htab->elf.sgot->output_section->vma
4136 + htab->elf.sgot->output_offset + off);
4138 if (GOT_TLS_GD_P (tls_type))
4139 dr_type = R_X86_64_DTPMOD64;
4140 else if (GOT_TLS_GDESC_P (tls_type))
4143 dr_type = R_X86_64_TPOFF64;
4145 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4146 outrel.r_addend = 0;
4147 if ((dr_type == R_X86_64_TPOFF64
4148 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4149 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4150 outrel.r_info = htab->r_info (indx, dr_type);
4152 elf_append_rela (output_bfd, sreloc, &outrel);
4154 if (GOT_TLS_GD_P (tls_type))
4158 BFD_ASSERT (! unresolved_reloc);
4159 bfd_put_64 (output_bfd,
4160 relocation - elf_x86_64_dtpoff_base (info),
4161 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4165 bfd_put_64 (output_bfd, 0,
4166 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4167 outrel.r_info = htab->r_info (indx,
4169 outrel.r_offset += GOT_ENTRY_SIZE;
4170 elf_append_rela (output_bfd, sreloc,
4179 local_got_offsets[r_symndx] |= 1;
4182 if (off >= (bfd_vma) -2
4183 && ! GOT_TLS_GDESC_P (tls_type))
4185 if (r_type == ELF32_R_TYPE (rel->r_info))
4187 if (r_type == R_X86_64_GOTPC32_TLSDESC
4188 || r_type == R_X86_64_TLSDESC_CALL)
4189 relocation = htab->elf.sgotplt->output_section->vma
4190 + htab->elf.sgotplt->output_offset
4191 + offplt + htab->sgotplt_jump_table_size;
4193 relocation = htab->elf.sgot->output_section->vma
4194 + htab->elf.sgot->output_offset + off;
4195 unresolved_reloc = FALSE;
4199 bfd_vma roff = rel->r_offset;
4201 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4203 /* GD->IE transition. For 64bit, change
4204 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4205 .word 0x6666; rex64; call __tls_get_addr@plt
4208 addq foo@gottpoff(%rip), %rax
4210 leaq foo@tlsgd(%rip), %rdi
4211 .word 0x6666; rex64; call __tls_get_addr@plt
4214 addq foo@gottpoff(%rip), %rax */
4215 if (ABI_64_P (output_bfd))
4216 memcpy (contents + roff - 4,
4217 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4220 memcpy (contents + roff - 3,
4221 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4224 relocation = (htab->elf.sgot->output_section->vma
4225 + htab->elf.sgot->output_offset + off
4227 - input_section->output_section->vma
4228 - input_section->output_offset
4230 bfd_put_32 (output_bfd, relocation,
4231 contents + roff + 8);
4232 /* Skip R_X86_64_PLT32. */
4236 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4238 /* GDesc -> IE transition.
4239 It's originally something like:
4240 leaq x@tlsdesc(%rip), %rax
4243 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4245 /* Now modify the instruction as appropriate. To
4246 turn a leaq into a movq in the form we use it, it
4247 suffices to change the second byte from 0x8d to
4249 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4251 bfd_put_32 (output_bfd,
4252 htab->elf.sgot->output_section->vma
4253 + htab->elf.sgot->output_offset + off
4255 - input_section->output_section->vma
4256 - input_section->output_offset
4261 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4263 /* GDesc -> IE transition.
4270 bfd_put_8 (output_bfd, 0x66, contents + roff);
4271 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4279 case R_X86_64_TLSLD:
4280 if (! elf_x86_64_tls_transition (info, input_bfd,
4281 input_section, contents,
4282 symtab_hdr, sym_hashes,
4283 &r_type, GOT_UNKNOWN,
4284 rel, relend, h, r_symndx))
4287 if (r_type != R_X86_64_TLSLD)
4289 /* LD->LE transition:
4290 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4291 For 64bit, we change it into:
4292 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4293 For 32bit, we change it into:
4294 nopl 0x0(%rax); movl %fs:0, %eax. */
4296 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4297 if (ABI_64_P (output_bfd))
4298 memcpy (contents + rel->r_offset - 3,
4299 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4301 memcpy (contents + rel->r_offset - 3,
4302 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4303 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
4308 if (htab->elf.sgot == NULL)
4311 off = htab->tls_ld_got.offset;
4316 Elf_Internal_Rela outrel;
4318 if (htab->elf.srelgot == NULL)
4321 outrel.r_offset = (htab->elf.sgot->output_section->vma
4322 + htab->elf.sgot->output_offset + off);
4324 bfd_put_64 (output_bfd, 0,
4325 htab->elf.sgot->contents + off);
4326 bfd_put_64 (output_bfd, 0,
4327 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4328 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4329 outrel.r_addend = 0;
4330 elf_append_rela (output_bfd, htab->elf.srelgot,
4332 htab->tls_ld_got.offset |= 1;
4334 relocation = htab->elf.sgot->output_section->vma
4335 + htab->elf.sgot->output_offset + off;
4336 unresolved_reloc = FALSE;
4339 case R_X86_64_DTPOFF32:
4340 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
4341 relocation -= elf_x86_64_dtpoff_base (info);
4343 relocation = elf_x86_64_tpoff (info, relocation);
4346 case R_X86_64_TPOFF32:
4347 case R_X86_64_TPOFF64:
4348 BFD_ASSERT (info->executable);
4349 relocation = elf_x86_64_tpoff (info, relocation);
4356 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4357 because such sections are not SEC_ALLOC and thus ld.so will
4358 not process them. */
4359 if (unresolved_reloc
4360 && !((input_section->flags & SEC_DEBUGGING) != 0
4362 && _bfd_elf_section_offset (output_bfd, info, input_section,
4363 rel->r_offset) != (bfd_vma) -1)
4365 (*_bfd_error_handler)
4366 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4369 (long) rel->r_offset,
4371 h->root.root.string);
4376 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4377 contents, rel->r_offset,
4378 relocation, rel->r_addend);
4380 check_relocation_error:
4381 if (r != bfd_reloc_ok)
4386 name = h->root.root.string;
4389 name = bfd_elf_string_from_elf_section (input_bfd,
4390 symtab_hdr->sh_link,
4395 name = bfd_section_name (input_bfd, sec);
4398 if (r == bfd_reloc_overflow)
4400 if (! ((*info->callbacks->reloc_overflow)
4401 (info, (h ? &h->root : NULL), name, howto->name,
4402 (bfd_vma) 0, input_bfd, input_section,
4408 (*_bfd_error_handler)
4409 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4410 input_bfd, input_section,
4411 (long) rel->r_offset, name, (int) r);
4420 /* Finish up dynamic symbol handling. We set the contents of various
4421 dynamic sections here. */
4424 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4425 struct bfd_link_info *info,
4426 struct elf_link_hash_entry *h,
4427 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4429 struct elf_x86_64_link_hash_table *htab;
4430 const struct elf_x86_64_backend_data *const abed
4431 = get_elf_x86_64_backend_data (output_bfd);
4433 htab = elf_x86_64_hash_table (info);
4437 if (h->plt.offset != (bfd_vma) -1)
4441 Elf_Internal_Rela rela;
4443 asection *plt, *gotplt, *relplt;
4444 const struct elf_backend_data *bed;
4446 /* When building a static executable, use .iplt, .igot.plt and
4447 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4448 if (htab->elf.splt != NULL)
4450 plt = htab->elf.splt;
4451 gotplt = htab->elf.sgotplt;
4452 relplt = htab->elf.srelplt;
4456 plt = htab->elf.iplt;
4457 gotplt = htab->elf.igotplt;
4458 relplt = htab->elf.irelplt;
4461 /* This symbol has an entry in the procedure linkage table. Set
4463 if ((h->dynindx == -1
4464 && !((h->forced_local || info->executable)
4466 && h->type == STT_GNU_IFUNC))
4472 /* Get the index in the procedure linkage table which
4473 corresponds to this symbol. This is the index of this symbol
4474 in all the symbols for which we are making plt entries. The
4475 first entry in the procedure linkage table is reserved.
4477 Get the offset into the .got table of the entry that
4478 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4479 bytes. The first three are reserved for the dynamic linker.
4481 For static executables, we don't reserve anything. */
4483 if (plt == htab->elf.splt)
4485 got_offset = h->plt.offset / abed->plt_entry_size - 1;
4486 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
4490 got_offset = h->plt.offset / abed->plt_entry_size;
4491 got_offset = got_offset * GOT_ENTRY_SIZE;
4494 /* Fill in the entry in the procedure linkage table. */
4495 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
4496 abed->plt_entry_size);
4498 /* Insert the relocation positions of the plt section. */
4500 /* Put offset the PC-relative instruction referring to the GOT entry,
4501 subtracting the size of that instruction. */
4502 bfd_put_32 (output_bfd,
4503 (gotplt->output_section->vma
4504 + gotplt->output_offset
4506 - plt->output_section->vma
4507 - plt->output_offset
4509 - abed->plt_got_insn_size),
4510 plt->contents + h->plt.offset + abed->plt_got_offset);
4512 /* Fill in the entry in the global offset table, initially this
4513 points to the second part of the PLT entry. */
4514 bfd_put_64 (output_bfd, (plt->output_section->vma
4515 + plt->output_offset
4516 + h->plt.offset + abed->plt_lazy_offset),
4517 gotplt->contents + got_offset);
4519 /* Fill in the entry in the .rela.plt section. */
4520 rela.r_offset = (gotplt->output_section->vma
4521 + gotplt->output_offset
4523 if (h->dynindx == -1
4524 || ((info->executable
4525 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4527 && h->type == STT_GNU_IFUNC))
4529 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4530 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4531 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4532 rela.r_addend = (h->root.u.def.value
4533 + h->root.u.def.section->output_section->vma
4534 + h->root.u.def.section->output_offset);
4535 /* R_X86_64_IRELATIVE comes last. */
4536 plt_index = htab->next_irelative_index--;
4540 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
4542 plt_index = htab->next_jump_slot_index++;
4545 /* Don't fill PLT entry for static executables. */
4546 if (plt == htab->elf.splt)
4548 /* Put relocation index. */
4549 bfd_put_32 (output_bfd, plt_index,
4550 plt->contents + h->plt.offset + abed->plt_reloc_offset);
4551 /* Put offset for jmp .PLT0. */
4552 bfd_put_32 (output_bfd, - (h->plt.offset + abed->plt_plt_insn_end),
4553 plt->contents + h->plt.offset + abed->plt_plt_offset);
4556 bed = get_elf_backend_data (output_bfd);
4557 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
4558 bed->s->swap_reloca_out (output_bfd, &rela, loc);
4560 if (!h->def_regular)
4562 /* Mark the symbol as undefined, rather than as defined in
4563 the .plt section. Leave the value if there were any
4564 relocations where pointer equality matters (this is a clue
4565 for the dynamic linker, to make function pointer
4566 comparisons work between an application and shared
4567 library), otherwise set it to zero. If a function is only
4568 called from a binary, there is no need to slow down
4569 shared libraries because of that. */
4570 sym->st_shndx = SHN_UNDEF;
4571 if (!h->pointer_equality_needed)
4576 if (h->got.offset != (bfd_vma) -1
4577 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
4578 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
4580 Elf_Internal_Rela rela;
4582 /* This symbol has an entry in the global offset table. Set it
4584 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4587 rela.r_offset = (htab->elf.sgot->output_section->vma
4588 + htab->elf.sgot->output_offset
4589 + (h->got.offset &~ (bfd_vma) 1));
4591 /* If this is a static link, or it is a -Bsymbolic link and the
4592 symbol is defined locally or was forced to be local because
4593 of a version file, we just want to emit a RELATIVE reloc.
4594 The entry in the global offset table will already have been
4595 initialized in the relocate_section function. */
4597 && h->type == STT_GNU_IFUNC)
4601 /* Generate R_X86_64_GLOB_DAT. */
4608 if (!h->pointer_equality_needed)
4611 /* For non-shared object, we can't use .got.plt, which
4612 contains the real function addres if we need pointer
4613 equality. We load the GOT entry with the PLT entry. */
4614 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4615 bfd_put_64 (output_bfd, (plt->output_section->vma
4616 + plt->output_offset
4618 htab->elf.sgot->contents + h->got.offset);
4622 else if (info->shared
4623 && SYMBOL_REFERENCES_LOCAL (info, h))
4625 if (!h->def_regular)
4627 BFD_ASSERT((h->got.offset & 1) != 0);
4628 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4629 rela.r_addend = (h->root.u.def.value
4630 + h->root.u.def.section->output_section->vma
4631 + h->root.u.def.section->output_offset);
4635 BFD_ASSERT((h->got.offset & 1) == 0);
4637 bfd_put_64 (output_bfd, (bfd_vma) 0,
4638 htab->elf.sgot->contents + h->got.offset);
4639 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4643 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
4648 Elf_Internal_Rela rela;
4650 /* This symbol needs a copy reloc. Set it up. */
4652 if (h->dynindx == -1
4653 || (h->root.type != bfd_link_hash_defined
4654 && h->root.type != bfd_link_hash_defweak)
4655 || htab->srelbss == NULL)
4658 rela.r_offset = (h->root.u.def.value
4659 + h->root.u.def.section->output_section->vma
4660 + h->root.u.def.section->output_offset);
4661 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4663 elf_append_rela (output_bfd, htab->srelbss, &rela);
4669 /* Finish up local dynamic symbol handling. We set the contents of
4670 various dynamic sections here. */
4673 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4675 struct elf_link_hash_entry *h
4676 = (struct elf_link_hash_entry *) *slot;
4677 struct bfd_link_info *info
4678 = (struct bfd_link_info *) inf;
4680 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4684 /* Used to decide how to sort relocs in an optimal manner for the
4685 dynamic linker, before writing them out. */
4687 static enum elf_reloc_type_class
4688 elf_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
4690 switch ((int) ELF32_R_TYPE (rela->r_info))
4692 case R_X86_64_RELATIVE:
4693 case R_X86_64_RELATIVE64:
4694 return reloc_class_relative;
4695 case R_X86_64_JUMP_SLOT:
4696 return reloc_class_plt;
4698 return reloc_class_copy;
4700 return reloc_class_normal;
4704 /* Finish up the dynamic sections. */
4707 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4708 struct bfd_link_info *info)
4710 struct elf_x86_64_link_hash_table *htab;
4713 const struct elf_x86_64_backend_data *const abed
4714 = get_elf_x86_64_backend_data (output_bfd);
4716 htab = elf_x86_64_hash_table (info);
4720 dynobj = htab->elf.dynobj;
4721 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4723 if (htab->elf.dynamic_sections_created)
4725 bfd_byte *dyncon, *dynconend;
4726 const struct elf_backend_data *bed;
4727 bfd_size_type sizeof_dyn;
4729 if (sdyn == NULL || htab->elf.sgot == NULL)
4732 bed = get_elf_backend_data (dynobj);
4733 sizeof_dyn = bed->s->sizeof_dyn;
4734 dyncon = sdyn->contents;
4735 dynconend = sdyn->contents + sdyn->size;
4736 for (; dyncon < dynconend; dyncon += sizeof_dyn)
4738 Elf_Internal_Dyn dyn;
4741 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
4749 s = htab->elf.sgotplt;
4750 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4754 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4758 s = htab->elf.srelplt->output_section;
4759 dyn.d_un.d_val = s->size;
4763 /* The procedure linkage table relocs (DT_JMPREL) should
4764 not be included in the overall relocs (DT_RELA).
4765 Therefore, we override the DT_RELASZ entry here to
4766 make it not include the JMPREL relocs. Since the
4767 linker script arranges for .rela.plt to follow all
4768 other relocation sections, we don't have to worry
4769 about changing the DT_RELA entry. */
4770 if (htab->elf.srelplt != NULL)
4772 s = htab->elf.srelplt->output_section;
4773 dyn.d_un.d_val -= s->size;
4777 case DT_TLSDESC_PLT:
4779 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4780 + htab->tlsdesc_plt;
4783 case DT_TLSDESC_GOT:
4785 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4786 + htab->tlsdesc_got;
4790 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
4793 /* Fill in the special first entry in the procedure linkage table. */
4794 if (htab->elf.splt && htab->elf.splt->size > 0)
4796 /* Fill in the first entry in the procedure linkage table. */
4797 memcpy (htab->elf.splt->contents,
4798 abed->plt0_entry, abed->plt_entry_size);
4799 /* Add offset for pushq GOT+8(%rip), since the instruction
4800 uses 6 bytes subtract this value. */
4801 bfd_put_32 (output_bfd,
4802 (htab->elf.sgotplt->output_section->vma
4803 + htab->elf.sgotplt->output_offset
4805 - htab->elf.splt->output_section->vma
4806 - htab->elf.splt->output_offset
4808 htab->elf.splt->contents + abed->plt0_got1_offset);
4809 /* Add offset for the PC-relative instruction accessing GOT+16,
4810 subtracting the offset to the end of that instruction. */
4811 bfd_put_32 (output_bfd,
4812 (htab->elf.sgotplt->output_section->vma
4813 + htab->elf.sgotplt->output_offset
4815 - htab->elf.splt->output_section->vma
4816 - htab->elf.splt->output_offset
4817 - abed->plt0_got2_insn_end),
4818 htab->elf.splt->contents + abed->plt0_got2_offset);
4820 elf_section_data (htab->elf.splt->output_section)
4821 ->this_hdr.sh_entsize = abed->plt_entry_size;
4823 if (htab->tlsdesc_plt)
4825 bfd_put_64 (output_bfd, (bfd_vma) 0,
4826 htab->elf.sgot->contents + htab->tlsdesc_got);
4828 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4829 abed->plt0_entry, abed->plt_entry_size);
4831 /* Add offset for pushq GOT+8(%rip), since the
4832 instruction uses 6 bytes subtract this value. */
4833 bfd_put_32 (output_bfd,
4834 (htab->elf.sgotplt->output_section->vma
4835 + htab->elf.sgotplt->output_offset
4837 - htab->elf.splt->output_section->vma
4838 - htab->elf.splt->output_offset
4841 htab->elf.splt->contents
4842 + htab->tlsdesc_plt + abed->plt0_got1_offset);
4843 /* Add offset for the PC-relative instruction accessing GOT+TDG,
4844 where TGD stands for htab->tlsdesc_got, subtracting the offset
4845 to the end of that instruction. */
4846 bfd_put_32 (output_bfd,
4847 (htab->elf.sgot->output_section->vma
4848 + htab->elf.sgot->output_offset
4850 - htab->elf.splt->output_section->vma
4851 - htab->elf.splt->output_offset
4853 - abed->plt0_got2_insn_end),
4854 htab->elf.splt->contents
4855 + htab->tlsdesc_plt + abed->plt0_got2_offset);
4860 if (htab->elf.sgotplt)
4862 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4864 (*_bfd_error_handler)
4865 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4869 /* Fill in the first three entries in the global offset table. */
4870 if (htab->elf.sgotplt->size > 0)
4872 /* Set the first entry in the global offset table to the address of
4873 the dynamic section. */
4875 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4877 bfd_put_64 (output_bfd,
4878 sdyn->output_section->vma + sdyn->output_offset,
4879 htab->elf.sgotplt->contents);
4880 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4881 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4882 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4885 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4889 /* Adjust .eh_frame for .plt section. */
4890 if (htab->plt_eh_frame != NULL
4891 && htab->plt_eh_frame->contents != NULL)
4893 if (htab->elf.splt != NULL
4894 && htab->elf.splt->size != 0
4895 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4896 && htab->elf.splt->output_section != NULL
4897 && htab->plt_eh_frame->output_section != NULL)
4899 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4900 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4901 + htab->plt_eh_frame->output_offset
4902 + PLT_FDE_START_OFFSET;
4903 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4904 htab->plt_eh_frame->contents
4905 + PLT_FDE_START_OFFSET);
4907 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4909 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4911 htab->plt_eh_frame->contents))
4916 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4917 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4920 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4921 htab_traverse (htab->loc_hash_table,
4922 elf_x86_64_finish_local_dynamic_symbol,
4928 /* Return address for Ith PLT stub in section PLT, for relocation REL
4929 or (bfd_vma) -1 if it should not be included. */
4932 elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4933 const arelent *rel ATTRIBUTE_UNUSED)
4935 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4938 /* Handle an x86-64 specific section when reading an object file. This
4939 is called when elfcode.h finds a section with an unknown type. */
4942 elf_x86_64_section_from_shdr (bfd *abfd,
4943 Elf_Internal_Shdr *hdr,
4947 if (hdr->sh_type != SHT_X86_64_UNWIND)
4950 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4956 /* Hook called by the linker routine which adds symbols from an object
4957 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4961 elf_x86_64_add_symbol_hook (bfd *abfd,
4962 struct bfd_link_info *info,
4963 Elf_Internal_Sym *sym,
4964 const char **namep ATTRIBUTE_UNUSED,
4965 flagword *flagsp ATTRIBUTE_UNUSED,
4971 switch (sym->st_shndx)
4973 case SHN_X86_64_LCOMMON:
4974 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4977 lcomm = bfd_make_section_with_flags (abfd,
4981 | SEC_LINKER_CREATED));
4984 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4987 *valp = sym->st_size;
4991 if ((abfd->flags & DYNAMIC) == 0
4992 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
4993 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
4994 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5000 /* Given a BFD section, try to locate the corresponding ELF section
5004 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
5005 asection *sec, int *index_return)
5007 if (sec == &_bfd_elf_large_com_section)
5009 *index_return = SHN_X86_64_LCOMMON;
5015 /* Process a symbol. */
5018 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5021 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5023 switch (elfsym->internal_elf_sym.st_shndx)
5025 case SHN_X86_64_LCOMMON:
5026 asym->section = &_bfd_elf_large_com_section;
5027 asym->value = elfsym->internal_elf_sym.st_size;
5028 /* Common symbol doesn't set BSF_GLOBAL. */
5029 asym->flags &= ~BSF_GLOBAL;
5035 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
5037 return (sym->st_shndx == SHN_COMMON
5038 || sym->st_shndx == SHN_X86_64_LCOMMON);
5042 elf_x86_64_common_section_index (asection *sec)
5044 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5047 return SHN_X86_64_LCOMMON;
5051 elf_x86_64_common_section (asection *sec)
5053 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5054 return bfd_com_section_ptr;
5056 return &_bfd_elf_large_com_section;
5060 elf_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5061 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
5062 struct elf_link_hash_entry *h,
5063 Elf_Internal_Sym *sym,
5065 bfd_vma *pvalue ATTRIBUTE_UNUSED,
5066 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
5067 bfd_boolean *skip ATTRIBUTE_UNUSED,
5068 bfd_boolean *override ATTRIBUTE_UNUSED,
5069 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
5070 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
5071 bfd_boolean *newdyn ATTRIBUTE_UNUSED,
5072 bfd_boolean *newdef,
5073 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
5074 bfd_boolean *newweak ATTRIBUTE_UNUSED,
5075 bfd *abfd ATTRIBUTE_UNUSED,
5077 bfd_boolean *olddyn ATTRIBUTE_UNUSED,
5078 bfd_boolean *olddef,
5079 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
5080 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
5084 /* A normal common symbol and a large common symbol result in a
5085 normal common symbol. We turn the large common symbol into a
5088 && h->root.type == bfd_link_hash_common
5090 && bfd_is_com_section (*sec)
5093 if (sym->st_shndx == SHN_COMMON
5094 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
5096 h->root.u.c.p->section
5097 = bfd_make_section_old_way (oldbfd, "COMMON");
5098 h->root.u.c.p->section->flags = SEC_ALLOC;
5100 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5101 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
5102 *psec = *sec = bfd_com_section_ptr;
5109 elf_x86_64_additional_program_headers (bfd *abfd,
5110 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5115 /* Check to see if we need a large readonly segment. */
5116 s = bfd_get_section_by_name (abfd, ".lrodata");
5117 if (s && (s->flags & SEC_LOAD))
5120 /* Check to see if we need a large data segment. Since .lbss sections
5121 is placed right after the .bss section, there should be no need for
5122 a large data segment just because of .lbss. */
5123 s = bfd_get_section_by_name (abfd, ".ldata");
5124 if (s && (s->flags & SEC_LOAD))
5130 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5133 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
5135 if (h->plt.offset != (bfd_vma) -1
5137 && !h->pointer_equality_needed)
5140 return _bfd_elf_hash_symbol (h);
5143 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5146 elf_x86_64_relocs_compatible (const bfd_target *input,
5147 const bfd_target *output)
5149 return ((xvec_get_elf_backend_data (input)->s->elfclass
5150 == xvec_get_elf_backend_data (output)->s->elfclass)
5151 && _bfd_elf_relocs_compatible (input, output));
5154 static const struct bfd_elf_special_section
5155 elf_x86_64_special_sections[]=
5157 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5158 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5159 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5160 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5161 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5162 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5163 { NULL, 0, 0, 0, 0 }
5166 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
5167 #define TARGET_LITTLE_NAME "elf64-x86-64"
5168 #define ELF_ARCH bfd_arch_i386
5169 #define ELF_TARGET_ID X86_64_ELF_DATA
5170 #define ELF_MACHINE_CODE EM_X86_64
5171 #define ELF_MAXPAGESIZE 0x200000
5172 #define ELF_MINPAGESIZE 0x1000
5173 #define ELF_COMMONPAGESIZE 0x1000
5175 #define elf_backend_can_gc_sections 1
5176 #define elf_backend_can_refcount 1
5177 #define elf_backend_want_got_plt 1
5178 #define elf_backend_plt_readonly 1
5179 #define elf_backend_want_plt_sym 0
5180 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5181 #define elf_backend_rela_normal 1
5182 #define elf_backend_plt_alignment 4
5184 #define elf_info_to_howto elf_x86_64_info_to_howto
5186 #define bfd_elf64_bfd_link_hash_table_create \
5187 elf_x86_64_link_hash_table_create
5188 #define bfd_elf64_bfd_link_hash_table_free \
5189 elf_x86_64_link_hash_table_free
5190 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5191 #define bfd_elf64_bfd_reloc_name_lookup \
5192 elf_x86_64_reloc_name_lookup
5194 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5195 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5196 #define elf_backend_check_relocs elf_x86_64_check_relocs
5197 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5198 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5199 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5200 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5201 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5202 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5203 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5204 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5206 #define elf_backend_write_core_note elf_x86_64_write_core_note
5208 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5209 #define elf_backend_relocate_section elf_x86_64_relocate_section
5210 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5211 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5212 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5213 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5214 #define elf_backend_object_p elf64_x86_64_elf_object_p
5215 #define bfd_elf64_mkobject elf_x86_64_mkobject
5217 #define elf_backend_section_from_shdr \
5218 elf_x86_64_section_from_shdr
5220 #define elf_backend_section_from_bfd_section \
5221 elf_x86_64_elf_section_from_bfd_section
5222 #define elf_backend_add_symbol_hook \
5223 elf_x86_64_add_symbol_hook
5224 #define elf_backend_symbol_processing \
5225 elf_x86_64_symbol_processing
5226 #define elf_backend_common_section_index \
5227 elf_x86_64_common_section_index
5228 #define elf_backend_common_section \
5229 elf_x86_64_common_section
5230 #define elf_backend_common_definition \
5231 elf_x86_64_common_definition
5232 #define elf_backend_merge_symbol \
5233 elf_x86_64_merge_symbol
5234 #define elf_backend_special_sections \
5235 elf_x86_64_special_sections
5236 #define elf_backend_additional_program_headers \
5237 elf_x86_64_additional_program_headers
5238 #define elf_backend_hash_symbol \
5239 elf_x86_64_hash_symbol
5241 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5243 #include "elf64-target.h"
5245 /* FreeBSD support. */
5247 #undef TARGET_LITTLE_SYM
5248 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
5249 #undef TARGET_LITTLE_NAME
5250 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5253 #define ELF_OSABI ELFOSABI_FREEBSD
5256 #define elf64_bed elf64_x86_64_fbsd_bed
5258 #include "elf64-target.h"
5260 /* Solaris 2 support. */
5262 #undef TARGET_LITTLE_SYM
5263 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
5264 #undef TARGET_LITTLE_NAME
5265 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5267 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5268 objects won't be recognized. */
5272 #define elf64_bed elf64_x86_64_sol2_bed
5274 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5276 #undef elf_backend_static_tls_alignment
5277 #define elf_backend_static_tls_alignment 16
5279 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5281 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5283 #undef elf_backend_want_plt_sym
5284 #define elf_backend_want_plt_sym 1
5286 #include "elf64-target.h"
5288 /* Native Client support. */
5290 #undef TARGET_LITTLE_SYM
5291 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec
5292 #undef TARGET_LITTLE_NAME
5293 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5295 #define elf64_bed elf64_x86_64_nacl_bed
5297 #undef ELF_MAXPAGESIZE
5298 #undef ELF_MINPAGESIZE
5299 #undef ELF_COMMONPAGESIZE
5300 #define ELF_MAXPAGESIZE 0x10000
5301 #define ELF_MINPAGESIZE 0x10000
5302 #define ELF_COMMONPAGESIZE 0x10000
5304 /* Restore defaults. */
5306 #undef elf_backend_static_tls_alignment
5307 #undef elf_backend_want_plt_sym
5308 #define elf_backend_want_plt_sym 0
5310 /* NaCl uses substantially different PLT entries for the same effects. */
5312 #undef elf_backend_plt_alignment
5313 #define elf_backend_plt_alignment 5
5314 #define NACL_PLT_ENTRY_SIZE 64
5315 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5317 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5319 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5320 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5321 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5322 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5323 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5325 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5326 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopl %cs:0x0(%rax,%rax,1) */
5328 /* 32 bytes of nop to pad out to the standard size. */
5329 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5330 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5331 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5332 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5333 0x66, /* excess data32 prefix */
5337 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5339 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5340 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5341 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5342 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5344 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5345 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5346 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5348 /* Lazy GOT entries point here (32-byte aligned). */
5349 0x68, /* pushq immediate */
5350 0, 0, 0, 0, /* replaced with index into relocation table. */
5351 0xe9, /* jmp relative */
5352 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5354 /* 22 bytes of nop to pad out to the standard size. */
5355 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5356 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5357 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5360 /* .eh_frame covering the .plt section. */
5362 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
5364 #if (PLT_CIE_LENGTH != 20 \
5365 || PLT_FDE_LENGTH != 36 \
5366 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5367 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5368 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5370 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5371 0, 0, 0, 0, /* CIE ID */
5372 1, /* CIE version */
5373 'z', 'R', 0, /* Augmentation string */
5374 1, /* Code alignment factor */
5375 0x78, /* Data alignment factor */
5376 16, /* Return address column */
5377 1, /* Augmentation size */
5378 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5379 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5380 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5381 DW_CFA_nop, DW_CFA_nop,
5383 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5384 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
5385 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5386 0, 0, 0, 0, /* .plt size goes here */
5387 0, /* Augmentation size */
5388 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
5389 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5390 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
5391 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5392 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5393 13, /* Block length */
5394 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
5395 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
5396 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5397 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
5398 DW_CFA_nop, DW_CFA_nop
5401 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
5403 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
5404 elf_x86_64_nacl_plt_entry, /* plt_entry */
5405 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5406 2, /* plt0_got1_offset */
5407 9, /* plt0_got2_offset */
5408 13, /* plt0_got2_insn_end */
5409 3, /* plt_got_offset */
5410 33, /* plt_reloc_offset */
5411 38, /* plt_plt_offset */
5412 7, /* plt_got_insn_size */
5413 42, /* plt_plt_insn_end */
5414 32, /* plt_lazy_offset */
5415 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
5416 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
5419 #undef elf_backend_arch_data
5420 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5422 #undef elf_backend_modify_segment_map
5423 #define elf_backend_modify_segment_map nacl_modify_segment_map
5424 #undef elf_backend_modify_program_headers
5425 #define elf_backend_modify_program_headers nacl_modify_program_headers
5427 #include "elf64-target.h"
5429 /* Native Client x32 support. */
5431 #undef TARGET_LITTLE_SYM
5432 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec
5433 #undef TARGET_LITTLE_NAME
5434 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5436 #define elf32_bed elf32_x86_64_nacl_bed
5438 #define bfd_elf32_bfd_link_hash_table_create \
5439 elf_x86_64_link_hash_table_create
5440 #define bfd_elf32_bfd_link_hash_table_free \
5441 elf_x86_64_link_hash_table_free
5442 #define bfd_elf32_bfd_reloc_type_lookup \
5443 elf_x86_64_reloc_type_lookup
5444 #define bfd_elf32_bfd_reloc_name_lookup \
5445 elf_x86_64_reloc_name_lookup
5446 #define bfd_elf32_mkobject \
5449 #undef elf_backend_object_p
5450 #define elf_backend_object_p \
5451 elf32_x86_64_elf_object_p
5453 #undef elf_backend_bfd_from_remote_memory
5454 #define elf_backend_bfd_from_remote_memory \
5455 _bfd_elf32_bfd_from_remote_memory
5457 #undef elf_backend_size_info
5458 #define elf_backend_size_info \
5459 _bfd_elf32_size_info
5461 #include "elf32-target.h"
5463 /* Restore defaults. */
5464 #undef elf_backend_object_p
5465 #define elf_backend_object_p elf64_x86_64_elf_object_p
5466 #undef elf_backend_bfd_from_remote_memory
5467 #undef elf_backend_size_info
5468 #undef elf_backend_modify_segment_map
5469 #undef elf_backend_modify_program_headers
5471 /* Intel L1OM support. */
5474 elf64_l1om_elf_object_p (bfd *abfd)
5476 /* Set the right machine number for an L1OM elf64 file. */
5477 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
5481 #undef TARGET_LITTLE_SYM
5482 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
5483 #undef TARGET_LITTLE_NAME
5484 #define TARGET_LITTLE_NAME "elf64-l1om"
5486 #define ELF_ARCH bfd_arch_l1om
5488 #undef ELF_MACHINE_CODE
5489 #define ELF_MACHINE_CODE EM_L1OM
5494 #define elf64_bed elf64_l1om_bed
5496 #undef elf_backend_object_p
5497 #define elf_backend_object_p elf64_l1om_elf_object_p
5499 /* Restore defaults. */
5500 #undef ELF_MAXPAGESIZE
5501 #undef ELF_MINPAGESIZE
5502 #undef ELF_COMMONPAGESIZE
5503 #define ELF_MAXPAGESIZE 0x200000
5504 #define ELF_MINPAGESIZE 0x1000
5505 #define ELF_COMMONPAGESIZE 0x1000
5506 #undef elf_backend_plt_alignment
5507 #define elf_backend_plt_alignment 4
5508 #undef elf_backend_arch_data
5509 #define elf_backend_arch_data &elf_x86_64_arch_bed
5511 #include "elf64-target.h"
5513 /* FreeBSD L1OM support. */
5515 #undef TARGET_LITTLE_SYM
5516 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
5517 #undef TARGET_LITTLE_NAME
5518 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5521 #define ELF_OSABI ELFOSABI_FREEBSD
5524 #define elf64_bed elf64_l1om_fbsd_bed
5526 #include "elf64-target.h"
5528 /* Intel K1OM support. */
5531 elf64_k1om_elf_object_p (bfd *abfd)
5533 /* Set the right machine number for an K1OM elf64 file. */
5534 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
5538 #undef TARGET_LITTLE_SYM
5539 #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec
5540 #undef TARGET_LITTLE_NAME
5541 #define TARGET_LITTLE_NAME "elf64-k1om"
5543 #define ELF_ARCH bfd_arch_k1om
5545 #undef ELF_MACHINE_CODE
5546 #define ELF_MACHINE_CODE EM_K1OM
5551 #define elf64_bed elf64_k1om_bed
5553 #undef elf_backend_object_p
5554 #define elf_backend_object_p elf64_k1om_elf_object_p
5556 #undef elf_backend_static_tls_alignment
5558 #undef elf_backend_want_plt_sym
5559 #define elf_backend_want_plt_sym 0
5561 #include "elf64-target.h"
5563 /* FreeBSD K1OM support. */
5565 #undef TARGET_LITTLE_SYM
5566 #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec
5567 #undef TARGET_LITTLE_NAME
5568 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5571 #define ELF_OSABI ELFOSABI_FREEBSD
5574 #define elf64_bed elf64_k1om_fbsd_bed
5576 #include "elf64-target.h"
5578 /* 32bit x86-64 support. */
5580 #undef TARGET_LITTLE_SYM
5581 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
5582 #undef TARGET_LITTLE_NAME
5583 #define TARGET_LITTLE_NAME "elf32-x86-64"
5587 #define ELF_ARCH bfd_arch_i386
5589 #undef ELF_MACHINE_CODE
5590 #define ELF_MACHINE_CODE EM_X86_64
5594 #undef elf_backend_object_p
5595 #define elf_backend_object_p \
5596 elf32_x86_64_elf_object_p
5598 #undef elf_backend_bfd_from_remote_memory
5599 #define elf_backend_bfd_from_remote_memory \
5600 _bfd_elf32_bfd_from_remote_memory
5602 #undef elf_backend_size_info
5603 #define elf_backend_size_info \
5604 _bfd_elf32_size_info
5606 #include "elf32-target.h"