1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2017 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
22 #include "elfxx-x86.h"
25 #include "libiberty.h"
27 #include "opcode/i386.h"
28 #include "elf/x86-64.h"
35 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
36 #define MINUS_ONE (~ (bfd_vma) 0)
38 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
39 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
40 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
41 since they are the same. */
43 /* The relocation "howto" table. Order of fields:
44 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
45 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
46 static reloc_howto_type x86_64_elf_howto_table[] =
48 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
49 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
51 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
54 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
55 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
57 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
58 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
60 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
61 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
63 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
69 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
72 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
75 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
76 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
78 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
79 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
81 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
82 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
84 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
86 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
88 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
90 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
91 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
92 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
95 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
98 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
101 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
102 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
104 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
107 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
108 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
110 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
113 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
114 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
116 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
119 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
121 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
122 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
124 FALSE, 0xffffffff, 0xffffffff, TRUE),
125 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
126 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
128 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
129 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
131 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
133 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
134 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
135 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
137 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
138 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
140 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
141 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
143 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
144 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
146 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
147 complain_overflow_bitfield, bfd_elf_generic_reloc,
148 "R_X86_64_GOTPC32_TLSDESC",
149 FALSE, 0xffffffff, 0xffffffff, TRUE),
150 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
151 complain_overflow_dont, bfd_elf_generic_reloc,
152 "R_X86_64_TLSDESC_CALL",
154 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
155 complain_overflow_bitfield, bfd_elf_generic_reloc,
157 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
158 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
161 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
164 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
165 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
167 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
168 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
170 HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
171 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
173 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
174 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
177 /* We have a gap in the reloc numbers here.
178 R_X86_64_standard counts the number up to this point, and
179 R_X86_64_vt_offset is the value to subtract from a reloc type of
180 R_X86_64_GNU_VT* to form an index into this table. */
181 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
182 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
184 /* GNU extension to record C++ vtable hierarchy. */
185 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
186 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
188 /* GNU extension to record C++ vtable member usage. */
189 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
190 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
193 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
194 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
195 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
199 #define IS_X86_64_PCREL_TYPE(TYPE) \
200 ( ((TYPE) == R_X86_64_PC8) \
201 || ((TYPE) == R_X86_64_PC16) \
202 || ((TYPE) == R_X86_64_PC32) \
203 || ((TYPE) == R_X86_64_PC32_BND) \
204 || ((TYPE) == R_X86_64_PC64))
206 /* Map BFD relocs to the x86_64 elf relocs. */
209 bfd_reloc_code_real_type bfd_reloc_val;
210 unsigned char elf_reloc_val;
213 static const struct elf_reloc_map x86_64_reloc_map[] =
215 { BFD_RELOC_NONE, R_X86_64_NONE, },
216 { BFD_RELOC_64, R_X86_64_64, },
217 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
218 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
219 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
220 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
221 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
222 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
223 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
224 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
225 { BFD_RELOC_32, R_X86_64_32, },
226 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
227 { BFD_RELOC_16, R_X86_64_16, },
228 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
229 { BFD_RELOC_8, R_X86_64_8, },
230 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
231 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
232 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
233 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
234 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
235 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
236 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
237 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
238 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
239 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
240 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
241 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
242 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
243 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
244 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
245 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
246 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
247 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
248 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
249 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
250 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
251 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
252 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
253 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
254 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
255 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
256 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
257 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
258 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
261 static reloc_howto_type *
262 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
266 if (r_type == (unsigned int) R_X86_64_32)
271 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
273 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
274 || r_type >= (unsigned int) R_X86_64_max)
276 if (r_type >= (unsigned int) R_X86_64_standard)
278 /* xgettext:c-format */
279 _bfd_error_handler (_("%B: invalid relocation type %d"),
281 r_type = R_X86_64_NONE;
286 i = r_type - (unsigned int) R_X86_64_vt_offset;
287 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
288 return &x86_64_elf_howto_table[i];
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type *
293 elf_x86_64_reloc_type_lookup (bfd *abfd,
294 bfd_reloc_code_real_type code)
298 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
301 if (x86_64_reloc_map[i].bfd_reloc_val == code)
302 return elf_x86_64_rtype_to_howto (abfd,
303 x86_64_reloc_map[i].elf_reloc_val);
308 static reloc_howto_type *
309 elf_x86_64_reloc_name_lookup (bfd *abfd,
314 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type *reloc
318 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
319 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
323 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
324 if (x86_64_elf_howto_table[i].name != NULL
325 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
326 return &x86_64_elf_howto_table[i];
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
334 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
335 Elf_Internal_Rela *dst)
339 r_type = ELF32_R_TYPE (dst->r_info);
340 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
341 BFD_ASSERT (r_type == cache_ptr->howto->type);
344 /* Support for core dump NOTE sections. */
346 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
351 switch (note->descsz)
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
358 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
361 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
371 elf_tdata (abfd)->core->signal
372 = bfd_get_16 (abfd, note->descdata + 12);
375 elf_tdata (abfd)->core->lwpid
376 = bfd_get_32 (abfd, note->descdata + 32);
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
387 size, note->descpos + offset);
391 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
393 switch (note->descsz)
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd)->core->pid
400 = bfd_get_32 (abfd, note->descdata + 12);
401 elf_tdata (abfd)->core->program
402 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
403 elf_tdata (abfd)->core->command
404 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 24);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
421 char *command = elf_tdata (abfd)->core->command;
422 int n = strlen (command);
424 if (0 < n && command[n - 1] == ' ')
425 command[n - 1] = '\0';
433 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
436 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
438 const char *fname, *psargs;
449 va_start (ap, note_type);
450 fname = va_arg (ap, const char *);
451 psargs = va_arg (ap, const char *);
454 if (bed->s->elfclass == ELFCLASS32)
457 memset (&data, 0, sizeof (data));
458 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
459 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
460 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
461 &data, sizeof (data));
466 memset (&data, 0, sizeof (data));
467 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
468 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
469 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
470 &data, sizeof (data));
475 va_start (ap, note_type);
476 pid = va_arg (ap, long);
477 cursig = va_arg (ap, int);
478 gregs = va_arg (ap, const void *);
481 if (bed->s->elfclass == ELFCLASS32)
483 if (bed->elf_machine_code == EM_X86_64)
485 prstatusx32_t prstat;
486 memset (&prstat, 0, sizeof (prstat));
488 prstat.pr_cursig = cursig;
489 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
490 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
491 &prstat, sizeof (prstat));
496 memset (&prstat, 0, sizeof (prstat));
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
507 memset (&prstat, 0, sizeof (prstat));
509 prstat.pr_cursig = cursig;
510 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
511 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
512 &prstat, sizeof (prstat));
519 /* Functions for the x86-64 ELF linker. */
521 /* The size in bytes of an entry in the global offset table. */
523 #define GOT_ENTRY_SIZE 8
525 /* The size in bytes of an entry in the lazy procedure linkage table. */
527 #define LAZY_PLT_ENTRY_SIZE 16
529 /* The size in bytes of an entry in the non-lazy procedure linkage
532 #define NON_LAZY_PLT_ENTRY_SIZE 8
534 /* The first entry in a lazy procedure linkage table looks like this.
535 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this
538 static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
540 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
541 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
542 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
545 /* Subsequent entries in a lazy procedure linkage table look like this. */
547 static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
549 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
550 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
551 0x68, /* pushq immediate */
552 0, 0, 0, 0, /* replaced with index into relocation table. */
553 0xe9, /* jmp relative */
554 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
557 /* The first entry in a lazy procedure linkage table with BND prefix
560 static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
562 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
563 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
564 0x0f, 0x1f, 0 /* nopl (%rax) */
567 /* Subsequent entries for branches with BND prefx in a lazy procedure
568 linkage table look like this. */
570 static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] =
572 0x68, 0, 0, 0, 0, /* pushq immediate */
573 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
574 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
577 /* The first entry in the IBT-enabled lazy procedure linkage table is the
578 the same as the lazy PLT with BND prefix so that bound registers are
579 preserved when control is passed to dynamic linker. Subsequent
580 entries for a IBT-enabled lazy procedure linkage table look like
583 static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
585 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
586 0x68, 0, 0, 0, 0, /* pushq immediate */
587 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
591 /* The first entry in the x32 IBT-enabled lazy procedure linkage table
592 is the same as the normal lazy PLT. Subsequent entries for an
593 x32 IBT-enabled lazy procedure linkage table look like this. */
595 static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
597 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
598 0x68, 0, 0, 0, 0, /* pushq immediate */
599 0xe9, 0, 0, 0, 0, /* jmpq relative */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* Entries in the non-lazey procedure linkage table look like this. */
605 static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
612 /* Entries for branches with BND prefix in the non-lazey procedure
613 linkage table look like this. */
615 static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
622 /* Entries for branches with IBT-enabled in the non-lazey procedure
623 linkage table look like this. They have the same size as the lazy
626 static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
628 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
629 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
630 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
631 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */
634 /* Entries for branches with IBT-enabled in the x32 non-lazey procedure
635 linkage table look like this. They have the same size as the lazy
638 static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
640 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
641 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
642 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
643 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
646 /* .eh_frame covering the lazy .plt section. */
648 static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] =
650 #define PLT_CIE_LENGTH 20
651 #define PLT_FDE_LENGTH 36
652 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
653 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
654 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
655 0, 0, 0, 0, /* CIE ID */
657 'z', 'R', 0, /* Augmentation string */
658 1, /* Code alignment factor */
659 0x78, /* Data alignment factor */
660 16, /* Return address column */
661 1, /* Augmentation size */
662 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
663 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
664 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
665 DW_CFA_nop, DW_CFA_nop,
667 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
668 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
669 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
670 0, 0, 0, 0, /* .plt size goes here */
671 0, /* Augmentation size */
672 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
673 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
674 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
675 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
676 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
677 11, /* Block length */
678 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
679 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
680 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
681 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
682 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
685 /* .eh_frame covering the lazy BND .plt section. */
687 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] =
689 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
690 0, 0, 0, 0, /* CIE ID */
692 'z', 'R', 0, /* Augmentation string */
693 1, /* Code alignment factor */
694 0x78, /* Data alignment factor */
695 16, /* Return address column */
696 1, /* Augmentation size */
697 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
698 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
699 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
700 DW_CFA_nop, DW_CFA_nop,
702 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
703 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
704 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
705 0, 0, 0, 0, /* .plt size goes here */
706 0, /* Augmentation size */
707 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
708 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
709 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
710 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
711 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
712 11, /* Block length */
713 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
714 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
715 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge,
716 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
717 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
720 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
722 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] =
724 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
725 0, 0, 0, 0, /* CIE ID */
727 'z', 'R', 0, /* Augmentation string */
728 1, /* Code alignment factor */
729 0x78, /* Data alignment factor */
730 16, /* Return address column */
731 1, /* Augmentation size */
732 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
733 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
734 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
735 DW_CFA_nop, DW_CFA_nop,
737 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
738 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
739 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
740 0, 0, 0, 0, /* .plt size goes here */
741 0, /* Augmentation size */
742 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
743 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
744 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
745 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
746 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
747 11, /* Block length */
748 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
749 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
750 DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge,
751 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
755 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */
757 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] =
759 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
760 0, 0, 0, 0, /* CIE ID */
762 'z', 'R', 0, /* Augmentation string */
763 1, /* Code alignment factor */
764 0x78, /* Data alignment factor */
765 16, /* Return address column */
766 1, /* Augmentation size */
767 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
768 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
769 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
770 DW_CFA_nop, DW_CFA_nop,
772 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
773 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
774 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
775 0, 0, 0, 0, /* .plt size goes here */
776 0, /* Augmentation size */
777 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
778 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
779 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
780 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
781 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
782 11, /* Block length */
783 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
784 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
785 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
786 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
787 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
790 /* .eh_frame covering the non-lazy .plt section. */
792 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] =
794 #define PLT_GOT_FDE_LENGTH 20
795 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
796 0, 0, 0, 0, /* CIE ID */
798 'z', 'R', 0, /* Augmentation string */
799 1, /* Code alignment factor */
800 0x78, /* Data alignment factor */
801 16, /* Return address column */
802 1, /* Augmentation size */
803 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
804 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
805 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
806 DW_CFA_nop, DW_CFA_nop,
808 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
809 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
810 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
811 0, 0, 0, 0, /* non-lazy .plt size goes here */
812 0, /* Augmentation size */
813 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,
814 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
817 /* Architecture-specific backend data for x86-64. */
819 struct elf_x86_64_backend_data
829 #define get_elf_x86_64_arch_data(bed) \
830 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
832 #define get_elf_x86_64_backend_data(abfd) \
833 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
835 /* These are the standard parameters. */
836 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt =
838 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
839 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
840 elf_x86_64_lazy_plt_entry, /* plt_entry */
841 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
842 2, /* plt0_got1_offset */
843 8, /* plt0_got2_offset */
844 12, /* plt0_got2_insn_end */
845 2, /* plt_got_offset */
846 7, /* plt_reloc_offset */
847 12, /* plt_plt_offset */
848 6, /* plt_got_insn_size */
849 LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */
850 6, /* plt_lazy_offset */
851 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */
852 elf_x86_64_lazy_plt_entry, /* pic_plt_entry */
853 elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */
854 sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */
857 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt =
859 elf_x86_64_non_lazy_plt_entry, /* plt_entry */
860 elf_x86_64_non_lazy_plt_entry, /* pic_plt_entry */
861 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
862 2, /* plt_got_offset */
863 6, /* plt_got_insn_size */
864 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
865 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
868 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt =
870 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
871 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
872 elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */
873 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
874 2, /* plt0_got1_offset */
875 1+8, /* plt0_got2_offset */
876 1+12, /* plt0_got2_insn_end */
877 1+2, /* plt_got_offset */
878 1, /* plt_reloc_offset */
879 7, /* plt_plt_offset */
880 1+6, /* plt_got_insn_size */
881 11, /* plt_plt_insn_end */
882 0, /* plt_lazy_offset */
883 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */
884 elf_x86_64_lazy_bnd_plt_entry, /* pic_plt_entry */
885 elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */
886 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */
889 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt =
891 elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */
892 elf_x86_64_non_lazy_bnd_plt_entry, /* pic_plt_entry */
893 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
894 1+2, /* plt_got_offset */
895 1+6, /* plt_got_insn_size */
896 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
897 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
900 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt =
902 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
903 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
904 elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */
905 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
906 2, /* plt0_got1_offset */
907 1+8, /* plt0_got2_offset */
908 1+12, /* plt0_got2_insn_end */
909 4+1+2, /* plt_got_offset */
910 4+1, /* plt_reloc_offset */
911 4+1+6, /* plt_plt_offset */
912 4+1+6, /* plt_got_insn_size */
913 4+1+5+5, /* plt_plt_insn_end */
914 0, /* plt_lazy_offset */
915 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */
916 elf_x86_64_lazy_ibt_plt_entry, /* pic_plt_entry */
917 elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
918 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
921 static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt =
923 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
924 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
925 elf_x32_lazy_ibt_plt_entry, /* plt_entry */
926 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
927 2, /* plt0_got1_offset */
928 8, /* plt0_got2_offset */
929 12, /* plt0_got2_insn_end */
930 4+2, /* plt_got_offset */
931 4+1, /* plt_reloc_offset */
932 4+6, /* plt_plt_offset */
933 4+6, /* plt_got_insn_size */
934 4+5+5, /* plt_plt_insn_end */
935 0, /* plt_lazy_offset */
936 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */
937 elf_x32_lazy_ibt_plt_entry, /* pic_plt_entry */
938 elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
939 sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
942 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt =
944 elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */
945 elf_x86_64_non_lazy_ibt_plt_entry, /* pic_plt_entry */
946 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
947 4+1+2, /* plt_got_offset */
948 4+1+6, /* plt_got_insn_size */
949 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
950 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
953 static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt =
955 elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */
956 elf_x32_non_lazy_ibt_plt_entry, /* pic_plt_entry */
957 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
958 4+2, /* plt_got_offset */
959 4+6, /* plt_got_insn_size */
960 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
961 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
964 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
969 #define elf_backend_arch_data &elf_x86_64_arch_bed
971 /* Values in tls_type of x86 ELF linker hash entry. */
973 #define GOT_TLS_GDESC 4
974 #define GOT_TLS_GD_BOTH_P(type) \
975 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
976 #define GOT_TLS_GD_P(type) \
977 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
978 #define GOT_TLS_GDESC_P(type) \
979 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
980 #define GOT_TLS_GD_ANY_P(type) \
981 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
983 #define is_x86_64_elf(bfd) \
984 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
985 && elf_tdata (bfd) != NULL \
986 && elf_object_id (bfd) == X86_64_ELF_DATA)
988 #define elf_x86_64_compute_jump_table_size(htab) \
989 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
992 elf64_x86_64_elf_object_p (bfd *abfd)
994 /* Set the right machine number for an x86-64 elf64 file. */
995 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1000 elf32_x86_64_elf_object_p (bfd *abfd)
1002 /* Set the right machine number for an x86-64 elf32 file. */
1003 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1007 /* Return TRUE if the TLS access code sequence support transition
1011 elf_x86_64_check_tls_transition (bfd *abfd,
1012 struct bfd_link_info *info,
1015 Elf_Internal_Shdr *symtab_hdr,
1016 struct elf_link_hash_entry **sym_hashes,
1017 unsigned int r_type,
1018 const Elf_Internal_Rela *rel,
1019 const Elf_Internal_Rela *relend)
1022 unsigned long r_symndx;
1023 bfd_boolean largepic = FALSE;
1024 struct elf_link_hash_entry *h;
1026 struct elf_x86_link_hash_table *htab;
1028 bfd_boolean indirect_call;
1030 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1031 offset = rel->r_offset;
1034 case R_X86_64_TLSGD:
1035 case R_X86_64_TLSLD:
1036 if ((rel + 1) >= relend)
1039 if (r_type == R_X86_64_TLSGD)
1041 /* Check transition from GD access model. For 64bit, only
1042 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1043 .word 0x6666; rex64; call __tls_get_addr@PLT
1045 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1047 call *__tls_get_addr@GOTPCREL(%rip)
1048 which may be converted to
1049 addr32 call __tls_get_addr
1050 can transit to different access model. For 32bit, only
1051 leaq foo@tlsgd(%rip), %rdi
1052 .word 0x6666; rex64; call __tls_get_addr@PLT
1054 leaq foo@tlsgd(%rip), %rdi
1056 call *__tls_get_addr@GOTPCREL(%rip)
1057 which may be converted to
1058 addr32 call __tls_get_addr
1059 can transit to different access model. For largepic,
1061 leaq foo@tlsgd(%rip), %rdi
1062 movabsq $__tls_get_addr@pltoff, %rax
1066 leaq foo@tlsgd(%rip), %rdi
1067 movabsq $__tls_get_addr@pltoff, %rax
1071 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1073 if ((offset + 12) > sec->size)
1076 call = contents + offset + 4;
1078 || !((call[1] == 0x48
1086 && call[3] == 0xe8)))
1088 if (!ABI_64_P (abfd)
1089 || (offset + 19) > sec->size
1091 || memcmp (call - 7, leaq + 1, 3) != 0
1092 || memcmp (call, "\x48\xb8", 2) != 0
1096 || !((call[10] == 0x48 && call[12] == 0xd8)
1097 || (call[10] == 0x4c && call[12] == 0xf8)))
1101 else if (ABI_64_P (abfd))
1104 || memcmp (contents + offset - 4, leaq, 4) != 0)
1110 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1113 indirect_call = call[2] == 0xff;
1117 /* Check transition from LD access model. Only
1118 leaq foo@tlsld(%rip), %rdi;
1119 call __tls_get_addr@PLT
1121 leaq foo@tlsld(%rip), %rdi;
1122 call *__tls_get_addr@GOTPCREL(%rip)
1123 which may be converted to
1124 addr32 call __tls_get_addr
1125 can transit to different access model. For largepic
1127 leaq foo@tlsld(%rip), %rdi
1128 movabsq $__tls_get_addr@pltoff, %rax
1132 leaq foo@tlsld(%rip), %rdi
1133 movabsq $__tls_get_addr@pltoff, %rax
1137 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1139 if (offset < 3 || (offset + 9) > sec->size)
1142 if (memcmp (contents + offset - 3, lea, 3) != 0)
1145 call = contents + offset + 4;
1146 if (!(call[0] == 0xe8
1147 || (call[0] == 0xff && call[1] == 0x15)
1148 || (call[0] == 0x67 && call[1] == 0xe8)))
1150 if (!ABI_64_P (abfd)
1151 || (offset + 19) > sec->size
1152 || memcmp (call, "\x48\xb8", 2) != 0
1156 || !((call[10] == 0x48 && call[12] == 0xd8)
1157 || (call[10] == 0x4c && call[12] == 0xf8)))
1161 indirect_call = call[0] == 0xff;
1164 r_symndx = htab->r_sym (rel[1].r_info);
1165 if (r_symndx < symtab_hdr->sh_info)
1168 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1170 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
1173 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64;
1174 else if (indirect_call)
1175 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_GOTPCRELX;
1177 return (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1178 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
1180 case R_X86_64_GOTTPOFF:
1181 /* Check transition from IE access model:
1182 mov foo@gottpoff(%rip), %reg
1183 add foo@gottpoff(%rip), %reg
1186 /* Check REX prefix first. */
1187 if (offset >= 3 && (offset + 4) <= sec->size)
1189 val = bfd_get_8 (abfd, contents + offset - 3);
1190 if (val != 0x48 && val != 0x4c)
1192 /* X32 may have 0x44 REX prefix or no REX prefix. */
1193 if (ABI_64_P (abfd))
1199 /* X32 may not have any REX prefix. */
1200 if (ABI_64_P (abfd))
1202 if (offset < 2 || (offset + 3) > sec->size)
1206 val = bfd_get_8 (abfd, contents + offset - 2);
1207 if (val != 0x8b && val != 0x03)
1210 val = bfd_get_8 (abfd, contents + offset - 1);
1211 return (val & 0xc7) == 5;
1213 case R_X86_64_GOTPC32_TLSDESC:
1214 /* Check transition from GDesc access model:
1215 leaq x@tlsdesc(%rip), %rax
1217 Make sure it's a leaq adding rip to a 32-bit offset
1218 into any register, although it's probably almost always
1221 if (offset < 3 || (offset + 4) > sec->size)
1224 val = bfd_get_8 (abfd, contents + offset - 3);
1225 if ((val & 0xfb) != 0x48)
1228 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1231 val = bfd_get_8 (abfd, contents + offset - 1);
1232 return (val & 0xc7) == 0x05;
1234 case R_X86_64_TLSDESC_CALL:
1235 /* Check transition from GDesc access model:
1236 call *x@tlsdesc(%rax)
1238 if (offset + 2 <= sec->size)
1240 /* Make sure that it's a call *x@tlsdesc(%rax). */
1241 call = contents + offset;
1242 return call[0] == 0xff && call[1] == 0x10;
1252 /* Return TRUE if the TLS access transition is OK or no transition
1253 will be performed. Update R_TYPE if there is a transition. */
1256 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1257 asection *sec, bfd_byte *contents,
1258 Elf_Internal_Shdr *symtab_hdr,
1259 struct elf_link_hash_entry **sym_hashes,
1260 unsigned int *r_type, int tls_type,
1261 const Elf_Internal_Rela *rel,
1262 const Elf_Internal_Rela *relend,
1263 struct elf_link_hash_entry *h,
1264 unsigned long r_symndx,
1265 bfd_boolean from_relocate_section)
1267 unsigned int from_type = *r_type;
1268 unsigned int to_type = from_type;
1269 bfd_boolean check = TRUE;
1271 /* Skip TLS transition for functions. */
1273 && (h->type == STT_FUNC
1274 || h->type == STT_GNU_IFUNC))
1279 case R_X86_64_TLSGD:
1280 case R_X86_64_GOTPC32_TLSDESC:
1281 case R_X86_64_TLSDESC_CALL:
1282 case R_X86_64_GOTTPOFF:
1283 if (bfd_link_executable (info))
1286 to_type = R_X86_64_TPOFF32;
1288 to_type = R_X86_64_GOTTPOFF;
1291 /* When we are called from elf_x86_64_relocate_section, there may
1292 be additional transitions based on TLS_TYPE. */
1293 if (from_relocate_section)
1295 unsigned int new_to_type = to_type;
1297 if (bfd_link_executable (info)
1300 && tls_type == GOT_TLS_IE)
1301 new_to_type = R_X86_64_TPOFF32;
1303 if (to_type == R_X86_64_TLSGD
1304 || to_type == R_X86_64_GOTPC32_TLSDESC
1305 || to_type == R_X86_64_TLSDESC_CALL)
1307 if (tls_type == GOT_TLS_IE)
1308 new_to_type = R_X86_64_GOTTPOFF;
1311 /* We checked the transition before when we were called from
1312 elf_x86_64_check_relocs. We only want to check the new
1313 transition which hasn't been checked before. */
1314 check = new_to_type != to_type && from_type == to_type;
1315 to_type = new_to_type;
1320 case R_X86_64_TLSLD:
1321 if (bfd_link_executable (info))
1322 to_type = R_X86_64_TPOFF32;
1329 /* Return TRUE if there is no transition. */
1330 if (from_type == to_type)
1333 /* Check if the transition can be performed. */
1335 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1336 symtab_hdr, sym_hashes,
1337 from_type, rel, relend))
1339 reloc_howto_type *from, *to;
1342 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1343 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1346 name = h->root.root.string;
1349 struct elf_x86_link_hash_table *htab;
1351 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1356 Elf_Internal_Sym *isym;
1358 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1360 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1365 /* xgettext:c-format */
1366 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1367 "in section `%A' failed"),
1368 abfd, from->name, to->name, name, rel->r_offset, sec);
1369 bfd_set_error (bfd_error_bad_value);
1377 /* Rename some of the generic section flags to better document how they
1379 #define need_convert_load sec_flg0
1380 #define check_relocs_failed sec_flg1
1383 elf_x86_64_need_pic (struct bfd_link_info *info,
1384 bfd *input_bfd, asection *sec,
1385 struct elf_link_hash_entry *h,
1386 Elf_Internal_Shdr *symtab_hdr,
1387 Elf_Internal_Sym *isym,
1388 reloc_howto_type *howto)
1391 const char *und = "";
1392 const char *pic = "";
1398 name = h->root.root.string;
1399 switch (ELF_ST_VISIBILITY (h->other))
1402 v = _("hidden symbol ");
1405 v = _("internal symbol ");
1408 v = _("protected symbol ");
1411 if (((struct elf_x86_link_hash_entry *) h)->def_protected)
1412 v = _("protected symbol ");
1415 pic = _("; recompile with -fPIC");
1419 if (!h->def_regular && !h->def_dynamic)
1420 und = _("undefined ");
1424 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
1425 pic = _("; recompile with -fPIC");
1428 if (bfd_link_dll (info))
1429 object = _("a shared object");
1430 else if (bfd_link_pie (info))
1431 object = _("a PIE object");
1433 object = _("a PDE object");
1435 /* xgettext:c-format */
1436 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1437 "not be used when making %s%s"),
1438 input_bfd, howto->name, und, v, name,
1440 bfd_set_error (bfd_error_bad_value);
1441 sec->check_relocs_failed = 1;
1445 /* With the local symbol, foo, we convert
1446 mov foo@GOTPCREL(%rip), %reg
1450 call/jmp *foo@GOTPCREL(%rip)
1452 nop call foo/jmp foo nop
1453 When PIC is false, convert
1454 test %reg, foo@GOTPCREL(%rip)
1458 binop foo@GOTPCREL(%rip), %reg
1461 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1465 elf_x86_64_convert_load_reloc (bfd *abfd, asection *sec,
1467 Elf_Internal_Rela *irel,
1468 struct elf_link_hash_entry *h,
1469 bfd_boolean *converted,
1470 struct bfd_link_info *link_info)
1472 struct elf_x86_link_hash_table *htab;
1474 bfd_boolean require_reloc_pc32;
1476 bfd_boolean to_reloc_pc32;
1479 bfd_signed_vma raddend;
1480 unsigned int opcode;
1482 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
1483 unsigned int r_symndx;
1485 bfd_vma roff = irel->r_offset;
1487 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
1490 raddend = irel->r_addend;
1491 /* Addend for 32-bit PC-relative relocation must be -4. */
1495 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA);
1496 is_pic = bfd_link_pic (link_info);
1498 relocx = (r_type == R_X86_64_GOTPCRELX
1499 || r_type == R_X86_64_REX_GOTPCRELX);
1501 /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
1504 = link_info->disable_target_specific_optimizations > 1;
1506 r_symndx = htab->r_sym (irel->r_info);
1508 opcode = bfd_get_8 (abfd, contents + roff - 2);
1510 /* Convert mov to lea since it has been done for a while. */
1513 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1514 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1515 test, xor instructions. */
1520 /* We convert only to R_X86_64_PC32:
1522 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1523 3. require_reloc_pc32 is true.
1526 to_reloc_pc32 = (opcode == 0xff
1528 || require_reloc_pc32
1531 /* Get the symbol referred to by the reloc. */
1534 Elf_Internal_Sym *isym
1535 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
1537 /* Skip relocation against undefined symbols. */
1538 if (isym->st_shndx == SHN_UNDEF)
1541 symtype = ELF_ST_TYPE (isym->st_info);
1543 if (isym->st_shndx == SHN_ABS)
1544 tsec = bfd_abs_section_ptr;
1545 else if (isym->st_shndx == SHN_COMMON)
1546 tsec = bfd_com_section_ptr;
1547 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
1548 tsec = &_bfd_elf_large_com_section;
1550 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1552 toff = isym->st_value;
1556 /* Undefined weak symbol is only bound locally in executable
1557 and its reference is resolved as 0 without relocation
1558 overflow. We can only perform this optimization for
1559 GOTPCRELX relocations since we need to modify REX byte.
1560 It is OK convert mov with R_X86_64_GOTPCREL to
1562 if ((relocx || opcode == 0x8b)
1563 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
1566 elf_x86_hash_entry (h)))
1570 /* Skip for branch instructions since R_X86_64_PC32
1572 if (require_reloc_pc32)
1577 /* For non-branch instructions, we can convert to
1578 R_X86_64_32/R_X86_64_32S since we know if there
1580 to_reloc_pc32 = FALSE;
1583 /* Since we don't know the current PC when PIC is true,
1584 we can't convert to R_X86_64_PC32. */
1585 if (to_reloc_pc32 && is_pic)
1590 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1591 ld.so may use its link-time address. */
1592 else if (h->start_stop
1594 || h->root.type == bfd_link_hash_defined
1595 || h->root.type == bfd_link_hash_defweak)
1596 && h != htab->elf.hdynamic
1597 && SYMBOL_REFERENCES_LOCAL (link_info, h)))
1599 /* bfd_link_hash_new or bfd_link_hash_undefined is
1600 set by an assignment in a linker script in
1601 bfd_elf_record_link_assignment. start_stop is set
1602 on __start_SECNAME/__stop_SECNAME which mark section
1606 && (h->root.type == bfd_link_hash_new
1607 || h->root.type == bfd_link_hash_undefined
1608 || ((h->root.type == bfd_link_hash_defined
1609 || h->root.type == bfd_link_hash_defweak)
1610 && h->root.u.def.section == bfd_und_section_ptr))))
1612 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1613 if (require_reloc_pc32)
1617 tsec = h->root.u.def.section;
1618 toff = h->root.u.def.value;
1625 /* Don't convert GOTPCREL relocation against large section. */
1626 if (elf_section_data (tsec) != NULL
1627 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
1630 /* We can only estimate relocation overflow for R_X86_64_PC32. */
1634 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
1636 /* At this stage in linking, no SEC_MERGE symbol has been
1637 adjusted, so all references to such symbols need to be
1638 passed through _bfd_merged_section_offset. (Later, in
1639 relocate_section, all SEC_MERGE symbols *except* for
1640 section symbols have been adjusted.)
1642 gas may reduce relocations against symbols in SEC_MERGE
1643 sections to a relocation against the section symbol when
1644 the original addend was zero. When the reloc is against
1645 a section symbol we should include the addend in the
1646 offset passed to _bfd_merged_section_offset, since the
1647 location of interest is the original symbol. On the
1648 other hand, an access to "sym+addend" where "sym" is not
1649 a section symbol should not include the addend; Such an
1650 access is presumed to be an offset from "sym"; The
1651 location of interest is just "sym". */
1652 if (symtype == STT_SECTION)
1655 toff = _bfd_merged_section_offset (abfd, &tsec,
1656 elf_section_data (tsec)->sec_info,
1659 if (symtype != STT_SECTION)
1665 /* Don't convert if R_X86_64_PC32 relocation overflows. */
1666 if (tsec->output_section == sec->output_section)
1668 if ((toff - roff + 0x80000000) > 0xffffffff)
1673 bfd_signed_vma distance;
1675 /* At this point, we don't know the load addresses of TSEC
1676 section nor SEC section. We estimate the distrance between
1677 SEC and TSEC. We store the estimated distances in the
1678 compressed_size field of the output section, which is only
1679 used to decompress the compressed input section. */
1680 if (sec->output_section->compressed_size == 0)
1683 bfd_size_type size = 0;
1684 for (asect = link_info->output_bfd->sections;
1686 asect = asect->next)
1687 /* Skip debug sections since compressed_size is used to
1688 compress debug sections. */
1689 if ((asect->flags & SEC_DEBUGGING) == 0)
1692 for (i = asect->map_head.s;
1696 size = align_power (size, i->alignment_power);
1699 asect->compressed_size = size;
1703 /* Don't convert GOTPCREL relocations if TSEC isn't placed
1705 distance = (tsec->output_section->compressed_size
1706 - sec->output_section->compressed_size);
1710 /* Take PT_GNU_RELRO segment into account by adding
1712 if ((toff + distance + get_elf_backend_data (abfd)->maxpagesize
1713 - roff + 0x80000000) > 0xffffffff)
1720 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
1725 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
1727 modrm = bfd_get_8 (abfd, contents + roff - 1);
1730 /* Convert to "jmp foo nop". */
1733 nop_offset = irel->r_offset + 3;
1734 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1735 irel->r_offset -= 1;
1736 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1740 struct elf_x86_link_hash_entry *eh
1741 = (struct elf_x86_link_hash_entry *) h;
1743 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1746 /* To support TLS optimization, always use addr32 prefix for
1747 "call *__tls_get_addr@GOTPCREL(%rip)". */
1748 if (eh && eh->tls_get_addr)
1751 nop_offset = irel->r_offset - 2;
1755 nop = link_info->call_nop_byte;
1756 if (link_info->call_nop_as_suffix)
1758 nop_offset = irel->r_offset + 3;
1759 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1760 irel->r_offset -= 1;
1761 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1764 nop_offset = irel->r_offset - 2;
1767 bfd_put_8 (abfd, nop, contents + nop_offset);
1768 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1769 r_type = R_X86_64_PC32;
1774 unsigned int rex_mask = REX_R;
1776 if (r_type == R_X86_64_REX_GOTPCRELX)
1777 rex = bfd_get_8 (abfd, contents + roff - 3);
1785 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1786 "lea foo(%rip), %reg". */
1788 r_type = R_X86_64_PC32;
1792 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1793 "mov $foo, %reg". */
1795 modrm = bfd_get_8 (abfd, contents + roff - 1);
1796 modrm = 0xc0 | (modrm & 0x38) >> 3;
1797 if ((rex & REX_W) != 0
1798 && ABI_64_P (link_info->output_bfd))
1800 /* Keep the REX_W bit in REX byte for LP64. */
1801 r_type = R_X86_64_32S;
1802 goto rewrite_modrm_rex;
1806 /* If the REX_W bit in REX byte isn't needed,
1807 use R_X86_64_32 and clear the W bit to avoid
1808 sign-extend imm32 to imm64. */
1809 r_type = R_X86_64_32;
1810 /* Clear the W bit in REX byte. */
1812 goto rewrite_modrm_rex;
1818 /* R_X86_64_PC32 isn't supported. */
1822 modrm = bfd_get_8 (abfd, contents + roff - 1);
1825 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
1826 "test $foo, %reg". */
1827 modrm = 0xc0 | (modrm & 0x38) >> 3;
1832 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
1833 "binop $foo, %reg". */
1834 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
1838 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
1839 overflow when sign-extending imm32 to imm64. */
1840 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
1843 bfd_put_8 (abfd, modrm, contents + roff - 1);
1847 /* Move the R bit to the B bit in REX byte. */
1848 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
1849 bfd_put_8 (abfd, rex, contents + roff - 3);
1852 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
1856 bfd_put_8 (abfd, opcode, contents + roff - 2);
1859 irel->r_info = htab->r_info (r_symndx, r_type);
1866 /* Look through the relocs for a section during the first phase, and
1867 calculate needed space in the global offset table, procedure
1868 linkage table, and dynamic reloc sections. */
1871 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1873 const Elf_Internal_Rela *relocs)
1875 struct elf_x86_link_hash_table *htab;
1876 Elf_Internal_Shdr *symtab_hdr;
1877 struct elf_link_hash_entry **sym_hashes;
1878 const Elf_Internal_Rela *rel;
1879 const Elf_Internal_Rela *rel_end;
1883 if (bfd_link_relocatable (info))
1886 /* Don't do anything special with non-loaded, non-alloced sections.
1887 In particular, any relocs in such sections should not affect GOT
1888 and PLT reference counting (ie. we don't allow them to create GOT
1889 or PLT entries), there's no possibility or desire to optimize TLS
1890 relocs, and there's not much point in propagating relocs to shared
1891 libs that the dynamic linker won't relocate. */
1892 if ((sec->flags & SEC_ALLOC) == 0)
1895 BFD_ASSERT (is_x86_64_elf (abfd));
1897 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1900 sec->check_relocs_failed = 1;
1904 /* Get the section contents. */
1905 if (elf_section_data (sec)->this_hdr.contents != NULL)
1906 contents = elf_section_data (sec)->this_hdr.contents;
1907 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1909 sec->check_relocs_failed = 1;
1913 symtab_hdr = &elf_symtab_hdr (abfd);
1914 sym_hashes = elf_sym_hashes (abfd);
1918 rel_end = relocs + sec->reloc_count;
1919 for (rel = relocs; rel < rel_end; rel++)
1921 unsigned int r_type;
1922 unsigned int r_symndx;
1923 struct elf_link_hash_entry *h;
1924 struct elf_x86_link_hash_entry *eh;
1925 Elf_Internal_Sym *isym;
1927 bfd_boolean size_reloc;
1929 r_symndx = htab->r_sym (rel->r_info);
1930 r_type = ELF32_R_TYPE (rel->r_info);
1932 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1934 /* xgettext:c-format */
1935 _bfd_error_handler (_("%B: bad symbol index: %d"),
1940 if (r_symndx < symtab_hdr->sh_info)
1942 /* A local symbol. */
1943 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1948 /* Check relocation against local STT_GNU_IFUNC symbol. */
1949 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1951 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel,
1956 /* Fake a STT_GNU_IFUNC symbol. */
1957 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1959 h->type = STT_GNU_IFUNC;
1962 h->forced_local = 1;
1963 h->root.type = bfd_link_hash_defined;
1971 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1972 while (h->root.type == bfd_link_hash_indirect
1973 || h->root.type == bfd_link_hash_warning)
1974 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1977 /* Check invalid x32 relocations. */
1978 if (!ABI_64_P (abfd))
1984 case R_X86_64_DTPOFF64:
1985 case R_X86_64_TPOFF64:
1987 case R_X86_64_GOTOFF64:
1988 case R_X86_64_GOT64:
1989 case R_X86_64_GOTPCREL64:
1990 case R_X86_64_GOTPC64:
1991 case R_X86_64_GOTPLT64:
1992 case R_X86_64_PLTOFF64:
1995 name = h->root.root.string;
1997 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2000 /* xgettext:c-format */
2001 (_("%B: relocation %s against symbol `%s' isn't "
2002 "supported in x32 mode"), abfd,
2003 x86_64_elf_howto_table[r_type].name, name);
2004 bfd_set_error (bfd_error_bad_value);
2012 /* It is referenced by a non-shared object. */
2014 h->root.non_ir_ref_regular = 1;
2016 if (h->type == STT_GNU_IFUNC)
2017 elf_tdata (info->output_bfd)->has_gnu_symbols
2018 |= elf_gnu_symbol_ifunc;
2021 if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
2022 symtab_hdr, sym_hashes,
2023 &r_type, GOT_UNKNOWN,
2024 rel, rel_end, h, r_symndx, FALSE))
2027 eh = (struct elf_x86_link_hash_entry *) h;
2030 case R_X86_64_TLSLD:
2031 htab->tls_ld_or_ldm_got.refcount += 1;
2034 case R_X86_64_TPOFF32:
2035 if (!bfd_link_executable (info) && ABI_64_P (abfd))
2036 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2037 &x86_64_elf_howto_table[r_type]);
2039 eh->has_got_reloc = 1;
2042 case R_X86_64_GOTTPOFF:
2043 if (!bfd_link_executable (info))
2044 info->flags |= DF_STATIC_TLS;
2047 case R_X86_64_GOT32:
2048 case R_X86_64_GOTPCREL:
2049 case R_X86_64_GOTPCRELX:
2050 case R_X86_64_REX_GOTPCRELX:
2051 case R_X86_64_TLSGD:
2052 case R_X86_64_GOT64:
2053 case R_X86_64_GOTPCREL64:
2054 case R_X86_64_GOTPLT64:
2055 case R_X86_64_GOTPC32_TLSDESC:
2056 case R_X86_64_TLSDESC_CALL:
2057 /* This symbol requires a global offset table entry. */
2059 int tls_type, old_tls_type;
2063 default: tls_type = GOT_NORMAL; break;
2064 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
2065 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
2066 case R_X86_64_GOTPC32_TLSDESC:
2067 case R_X86_64_TLSDESC_CALL:
2068 tls_type = GOT_TLS_GDESC; break;
2073 h->got.refcount += 1;
2074 old_tls_type = eh->tls_type;
2078 bfd_signed_vma *local_got_refcounts;
2080 /* This is a global offset table entry for a local symbol. */
2081 local_got_refcounts = elf_local_got_refcounts (abfd);
2082 if (local_got_refcounts == NULL)
2086 size = symtab_hdr->sh_info;
2087 size *= sizeof (bfd_signed_vma)
2088 + sizeof (bfd_vma) + sizeof (char);
2089 local_got_refcounts = ((bfd_signed_vma *)
2090 bfd_zalloc (abfd, size));
2091 if (local_got_refcounts == NULL)
2093 elf_local_got_refcounts (abfd) = local_got_refcounts;
2094 elf_x86_local_tlsdesc_gotent (abfd)
2095 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2096 elf_x86_local_got_tls_type (abfd)
2097 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2099 local_got_refcounts[r_symndx] += 1;
2101 = elf_x86_local_got_tls_type (abfd) [r_symndx];
2104 /* If a TLS symbol is accessed using IE at least once,
2105 there is no point to use dynamic model for it. */
2106 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2107 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2108 || tls_type != GOT_TLS_IE))
2110 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
2111 tls_type = old_tls_type;
2112 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2113 && GOT_TLS_GD_ANY_P (tls_type))
2114 tls_type |= old_tls_type;
2118 name = h->root.root.string;
2120 name = bfd_elf_sym_name (abfd, symtab_hdr,
2123 /* xgettext:c-format */
2124 (_("%B: '%s' accessed both as normal and"
2125 " thread local symbol"),
2127 bfd_set_error (bfd_error_bad_value);
2132 if (old_tls_type != tls_type)
2135 eh->tls_type = tls_type;
2137 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
2142 case R_X86_64_GOTOFF64:
2143 case R_X86_64_GOTPC32:
2144 case R_X86_64_GOTPC64:
2147 eh->has_got_reloc = 1;
2150 case R_X86_64_PLT32:
2151 case R_X86_64_PLT32_BND:
2152 /* This symbol requires a procedure linkage table entry. We
2153 actually build the entry in adjust_dynamic_symbol,
2154 because this might be a case of linking PIC code which is
2155 never referenced by a dynamic object, in which case we
2156 don't need to generate a procedure linkage table entry
2159 /* If this is a local symbol, we resolve it directly without
2160 creating a procedure linkage table entry. */
2164 eh->has_got_reloc = 1;
2166 h->plt.refcount += 1;
2169 case R_X86_64_PLTOFF64:
2170 /* This tries to form the 'address' of a function relative
2171 to GOT. For global symbols we need a PLT entry. */
2175 h->plt.refcount += 1;
2179 case R_X86_64_SIZE32:
2180 case R_X86_64_SIZE64:
2185 if (!ABI_64_P (abfd))
2191 /* Check relocation overflow as these relocs may lead to
2192 run-time relocation overflow. Don't error out for
2193 sections we don't care about, such as debug sections or
2194 when relocation overflow check is disabled. */
2195 if (!info->no_reloc_overflow_check
2196 && (bfd_link_pic (info)
2197 || (bfd_link_executable (info)
2201 && (sec->flags & SEC_READONLY) == 0)))
2202 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2203 &x86_64_elf_howto_table[r_type]);
2209 case R_X86_64_PC32_BND:
2213 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2214 eh->has_non_got_reloc = 1;
2215 /* We are called after all symbols have been resolved. Only
2216 relocation against STT_GNU_IFUNC symbol must go through
2219 && (bfd_link_executable (info)
2220 || h->type == STT_GNU_IFUNC))
2222 /* If this reloc is in a read-only section, we might
2223 need a copy reloc. We can't check reliably at this
2224 stage whether the section is read-only, as input
2225 sections have not yet been mapped to output sections.
2226 Tentatively set the flag for now, and correct in
2227 adjust_dynamic_symbol. */
2230 /* We may need a .plt entry if the symbol is a function
2231 defined in a shared lib or is a STT_GNU_IFUNC function
2232 referenced from the code or read-only section. */
2234 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2235 h->plt.refcount += 1;
2237 if (r_type == R_X86_64_PC32)
2239 /* Since something like ".long foo - ." may be used
2240 as pointer, make sure that PLT is used if foo is
2241 a function defined in a shared library. */
2242 if ((sec->flags & SEC_CODE) == 0)
2243 h->pointer_equality_needed = 1;
2245 else if (r_type != R_X86_64_PC32_BND
2246 && r_type != R_X86_64_PC64)
2248 h->pointer_equality_needed = 1;
2249 /* At run-time, R_X86_64_64 can be resolved for both
2250 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2251 can only be resolved for x32. */
2252 if ((sec->flags & SEC_READONLY) == 0
2253 && (r_type == R_X86_64_64
2254 || (!ABI_64_P (abfd)
2255 && (r_type == R_X86_64_32
2256 || r_type == R_X86_64_32S))))
2257 eh->func_pointer_refcount += 1;
2263 /* If we are creating a shared library, and this is a reloc
2264 against a global symbol, or a non PC relative reloc
2265 against a local symbol, then we need to copy the reloc
2266 into the shared library. However, if we are linking with
2267 -Bsymbolic, we do not need to copy a reloc against a
2268 global symbol which is defined in an object we are
2269 including in the link (i.e., DEF_REGULAR is set). At
2270 this point we have not seen all the input files, so it is
2271 possible that DEF_REGULAR is not set now but will be set
2272 later (it is never cleared). In case of a weak definition,
2273 DEF_REGULAR may be cleared later by a strong definition in
2274 a shared library. We account for that possibility below by
2275 storing information in the relocs_copied field of the hash
2276 table entry. A similar situation occurs when creating
2277 shared libraries and symbol visibility changes render the
2280 If on the other hand, we are creating an executable, we
2281 may need to keep relocations for symbols satisfied by a
2282 dynamic library if we manage to avoid copy relocs for the
2285 Generate dynamic pointer relocation against STT_GNU_IFUNC
2286 symbol in the non-code section. */
2287 if ((bfd_link_pic (info)
2288 && (! IS_X86_64_PCREL_TYPE (r_type)
2290 && (! (bfd_link_pie (info)
2291 || SYMBOLIC_BIND (info, h))
2292 || h->root.type == bfd_link_hash_defweak
2293 || !h->def_regular))))
2295 && h->type == STT_GNU_IFUNC
2296 && r_type == htab->pointer_r_type
2297 && (sec->flags & SEC_CODE) == 0)
2298 || (ELIMINATE_COPY_RELOCS
2299 && !bfd_link_pic (info)
2301 && (h->root.type == bfd_link_hash_defweak
2302 || !h->def_regular)))
2304 struct elf_dyn_relocs *p;
2305 struct elf_dyn_relocs **head;
2307 /* We must copy these reloc types into the output file.
2308 Create a reloc section in dynobj and make room for
2312 sreloc = _bfd_elf_make_dynamic_reloc_section
2313 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2314 abfd, /*rela?*/ TRUE);
2320 /* If this is a global symbol, we count the number of
2321 relocations we need for this symbol. */
2323 head = &eh->dyn_relocs;
2326 /* Track dynamic relocs needed for local syms too.
2327 We really need local syms available to do this
2332 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2337 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2341 /* Beware of type punned pointers vs strict aliasing
2343 vpp = &(elf_section_data (s)->local_dynrel);
2344 head = (struct elf_dyn_relocs **)vpp;
2348 if (p == NULL || p->sec != sec)
2350 bfd_size_type amt = sizeof *p;
2352 p = ((struct elf_dyn_relocs *)
2353 bfd_alloc (htab->elf.dynobj, amt));
2364 /* Count size relocation as PC-relative relocation. */
2365 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2370 /* This relocation describes the C++ object vtable hierarchy.
2371 Reconstruct it for later use during GC. */
2372 case R_X86_64_GNU_VTINHERIT:
2373 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2377 /* This relocation describes which C++ vtable entries are actually
2378 used. Record for later use during GC. */
2379 case R_X86_64_GNU_VTENTRY:
2380 BFD_ASSERT (h != NULL);
2382 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2390 if ((r_type == R_X86_64_GOTPCREL
2391 || r_type == R_X86_64_GOTPCRELX
2392 || r_type == R_X86_64_REX_GOTPCRELX)
2393 && (h == NULL || h->type != STT_GNU_IFUNC))
2394 sec->need_convert_load = 1;
2397 if (elf_section_data (sec)->this_hdr.contents != contents)
2399 if (!info->keep_memory)
2403 /* Cache the section contents for elf_link_input_bfd. */
2404 elf_section_data (sec)->this_hdr.contents = contents;
2411 if (elf_section_data (sec)->this_hdr.contents != contents)
2413 sec->check_relocs_failed = 1;
2417 /* Allocate space in .plt, .got and associated reloc sections for
2421 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2423 struct bfd_link_info *info;
2424 struct elf_x86_link_hash_table *htab;
2425 struct elf_x86_link_hash_entry *eh;
2426 struct elf_dyn_relocs *p;
2427 const struct elf_backend_data *bed;
2428 unsigned int plt_entry_size;
2429 bfd_boolean resolved_to_zero;
2431 if (h->root.type == bfd_link_hash_indirect)
2434 eh = (struct elf_x86_link_hash_entry *) h;
2436 info = (struct bfd_link_info *) inf;
2437 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
2440 bed = get_elf_backend_data (info->output_bfd);
2442 plt_entry_size = htab->plt.plt_entry_size;
2444 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2449 /* We can't use the GOT PLT if pointer equality is needed since
2450 finish_dynamic_symbol won't clear symbol value and the dynamic
2451 linker won't update the GOT slot. We will get into an infinite
2452 loop at run-time. */
2453 if (htab->plt_got != NULL
2454 && h->type != STT_GNU_IFUNC
2455 && !h->pointer_equality_needed
2456 && h->plt.refcount > 0
2457 && h->got.refcount > 0)
2459 /* Don't use the regular PLT if there are both GOT and GOTPLT
2461 h->plt.offset = (bfd_vma) -1;
2463 /* Use the GOT PLT. */
2464 eh->plt_got.refcount = 1;
2467 /* Clear the reference count of function pointer relocations if
2468 symbol isn't a normal function. */
2469 if (h->type != STT_FUNC)
2470 eh->func_pointer_refcount = 0;
2472 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2473 here if it is defined and referenced in a non-shared object. */
2474 if (h->type == STT_GNU_IFUNC
2477 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2479 &htab->readonly_dynrelocs_against_ifunc,
2483 GOT_ENTRY_SIZE, TRUE))
2485 asection *s = htab->plt_second;
2486 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2488 /* Use the second PLT section if it is created. */
2489 eh->plt_second.offset = s->size;
2491 /* Make room for this entry in the second PLT section. */
2492 s->size += htab->non_lazy_plt->plt_entry_size;
2500 /* Don't create the PLT entry if there are only function pointer
2501 relocations which can be resolved at run-time. */
2502 else if (htab->elf.dynamic_sections_created
2503 && (h->plt.refcount > eh->func_pointer_refcount
2504 || eh->plt_got.refcount > 0))
2506 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2508 /* Clear the reference count of function pointer relocations
2510 eh->func_pointer_refcount = 0;
2512 /* Make sure this symbol is output as a dynamic symbol.
2513 Undefined weak syms won't yet be marked as dynamic. */
2514 if (h->dynindx == -1
2516 && !resolved_to_zero
2517 && h->root.type == bfd_link_hash_undefweak)
2519 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2523 if (bfd_link_pic (info)
2524 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2526 asection *s = htab->elf.splt;
2527 asection *second_s = htab->plt_second;
2528 asection *got_s = htab->plt_got;
2530 /* If this is the first .plt entry, make room for the special
2531 first entry. The .plt section is used by prelink to undo
2532 prelinking for dynamic relocations. */
2534 s->size = htab->plt.has_plt0 * plt_entry_size;
2537 eh->plt_got.offset = got_s->size;
2540 h->plt.offset = s->size;
2542 eh->plt_second.offset = second_s->size;
2545 /* If this symbol is not defined in a regular file, and we are
2546 not generating a shared library, then set the symbol to this
2547 location in the .plt. This is required to make function
2548 pointers compare as equal between the normal executable and
2549 the shared library. */
2550 if (! bfd_link_pic (info)
2555 /* We need to make a call to the entry of the GOT PLT
2556 instead of regular PLT entry. */
2557 h->root.u.def.section = got_s;
2558 h->root.u.def.value = eh->plt_got.offset;
2564 /* We need to make a call to the entry of the
2565 second PLT instead of regular PLT entry. */
2566 h->root.u.def.section = second_s;
2567 h->root.u.def.value = eh->plt_second.offset;
2571 h->root.u.def.section = s;
2572 h->root.u.def.value = h->plt.offset;
2577 /* Make room for this entry. */
2579 got_s->size += htab->non_lazy_plt->plt_entry_size;
2582 s->size += plt_entry_size;
2584 second_s->size += htab->non_lazy_plt->plt_entry_size;
2586 /* We also need to make an entry in the .got.plt section,
2587 which will be placed in the .got section by the linker
2589 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2591 /* There should be no PLT relocation against resolved
2592 undefined weak symbol in executable. */
2593 if (!resolved_to_zero)
2595 /* We also need to make an entry in the .rela.plt
2597 htab->elf.srelplt->size += bed->s->sizeof_rela;
2598 htab->elf.srelplt->reloc_count++;
2604 eh->plt_got.offset = (bfd_vma) -1;
2605 h->plt.offset = (bfd_vma) -1;
2611 eh->plt_got.offset = (bfd_vma) -1;
2612 h->plt.offset = (bfd_vma) -1;
2616 eh->tlsdesc_got = (bfd_vma) -1;
2618 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2619 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2620 if (h->got.refcount > 0
2621 && bfd_link_executable (info)
2623 && elf_x86_hash_entry (h)->tls_type == GOT_TLS_IE)
2625 h->got.offset = (bfd_vma) -1;
2627 else if (h->got.refcount > 0)
2631 int tls_type = elf_x86_hash_entry (h)->tls_type;
2633 /* Make sure this symbol is output as a dynamic symbol.
2634 Undefined weak syms won't yet be marked as dynamic. */
2635 if (h->dynindx == -1
2637 && !resolved_to_zero
2638 && h->root.type == bfd_link_hash_undefweak)
2640 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2644 if (GOT_TLS_GDESC_P (tls_type))
2646 eh->tlsdesc_got = htab->elf.sgotplt->size
2647 - elf_x86_64_compute_jump_table_size (htab);
2648 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2649 h->got.offset = (bfd_vma) -2;
2651 if (! GOT_TLS_GDESC_P (tls_type)
2652 || GOT_TLS_GD_P (tls_type))
2655 h->got.offset = s->size;
2656 s->size += GOT_ENTRY_SIZE;
2657 if (GOT_TLS_GD_P (tls_type))
2658 s->size += GOT_ENTRY_SIZE;
2660 dyn = htab->elf.dynamic_sections_created;
2661 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2662 and two if global. R_X86_64_GOTTPOFF needs one dynamic
2663 relocation. No dynamic relocation against resolved undefined
2664 weak symbol in executable. */
2665 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2666 || tls_type == GOT_TLS_IE)
2667 htab->elf.srelgot->size += bed->s->sizeof_rela;
2668 else if (GOT_TLS_GD_P (tls_type))
2669 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2670 else if (! GOT_TLS_GDESC_P (tls_type)
2671 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2672 && !resolved_to_zero)
2673 || h->root.type != bfd_link_hash_undefweak)
2674 && (bfd_link_pic (info)
2675 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2676 htab->elf.srelgot->size += bed->s->sizeof_rela;
2677 if (GOT_TLS_GDESC_P (tls_type))
2679 htab->elf.srelplt->size += bed->s->sizeof_rela;
2680 htab->tlsdesc_plt = (bfd_vma) -1;
2684 h->got.offset = (bfd_vma) -1;
2686 if (eh->dyn_relocs == NULL)
2689 /* In the shared -Bsymbolic case, discard space allocated for
2690 dynamic pc-relative relocs against symbols which turn out to be
2691 defined in regular objects. For the normal shared case, discard
2692 space for pc-relative relocs that have become local due to symbol
2693 visibility changes. */
2695 if (bfd_link_pic (info))
2697 /* Relocs that use pc_count are those that appear on a call
2698 insn, or certain REL relocs that can generated via assembly.
2699 We want calls to protected symbols to resolve directly to the
2700 function rather than going via the plt. If people want
2701 function pointer comparisons to work as expected then they
2702 should avoid writing weird assembly. */
2703 if (SYMBOL_CALLS_LOCAL (info, h))
2705 struct elf_dyn_relocs **pp;
2707 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2709 p->count -= p->pc_count;
2718 /* Also discard relocs on undefined weak syms with non-default
2719 visibility or in PIE. */
2720 if (eh->dyn_relocs != NULL)
2722 if (h->root.type == bfd_link_hash_undefweak)
2724 /* Undefined weak symbol is never bound locally in shared
2726 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2727 || resolved_to_zero)
2728 eh->dyn_relocs = NULL;
2729 else if (h->dynindx == -1
2730 && ! h->forced_local
2731 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2734 /* For PIE, discard space for pc-relative relocs against
2735 symbols which turn out to need copy relocs. */
2736 else if (bfd_link_executable (info)
2737 && (h->needs_copy || eh->needs_copy)
2741 struct elf_dyn_relocs **pp;
2743 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2745 if (p->pc_count != 0)
2753 else if (ELIMINATE_COPY_RELOCS)
2755 /* For the non-shared case, discard space for relocs against
2756 symbols which turn out to need copy relocs or are not
2757 dynamic. Keep dynamic relocations for run-time function
2758 pointer initialization. */
2760 if ((!h->non_got_ref
2761 || eh->func_pointer_refcount > 0
2762 || (h->root.type == bfd_link_hash_undefweak
2763 && !resolved_to_zero))
2766 || (htab->elf.dynamic_sections_created
2767 && (h->root.type == bfd_link_hash_undefweak
2768 || h->root.type == bfd_link_hash_undefined))))
2770 /* Make sure this symbol is output as a dynamic symbol.
2771 Undefined weak syms won't yet be marked as dynamic. */
2772 if (h->dynindx == -1
2773 && ! h->forced_local
2774 && ! resolved_to_zero
2775 && h->root.type == bfd_link_hash_undefweak
2776 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2779 /* If that succeeded, we know we'll be keeping all the
2781 if (h->dynindx != -1)
2785 eh->dyn_relocs = NULL;
2786 eh->func_pointer_refcount = 0;
2791 /* Finally, allocate space. */
2792 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2796 sreloc = elf_section_data (p->sec)->sreloc;
2798 BFD_ASSERT (sreloc != NULL);
2800 sreloc->size += p->count * bed->s->sizeof_rela;
2806 /* Allocate space in .plt, .got and associated reloc sections for
2807 local dynamic relocs. */
2810 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2812 struct elf_link_hash_entry *h
2813 = (struct elf_link_hash_entry *) *slot;
2815 if (h->type != STT_GNU_IFUNC
2819 || h->root.type != bfd_link_hash_defined)
2822 return elf_x86_64_allocate_dynrelocs (h, inf);
2825 /* Convert load via the GOT slot to load immediate. */
2828 elf_x86_64_convert_load (bfd *abfd, asection *sec,
2829 struct bfd_link_info *link_info)
2831 Elf_Internal_Shdr *symtab_hdr;
2832 Elf_Internal_Rela *internal_relocs;
2833 Elf_Internal_Rela *irel, *irelend;
2835 struct elf_x86_link_hash_table *htab;
2836 bfd_boolean changed;
2837 bfd_signed_vma *local_got_refcounts;
2839 /* Don't even try to convert non-ELF outputs. */
2840 if (!is_elf_hash_table (link_info->hash))
2843 /* Nothing to do if there is no need or no output. */
2844 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2845 || sec->need_convert_load == 0
2846 || bfd_is_abs_section (sec->output_section))
2849 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2851 /* Load the relocations for this section. */
2852 internal_relocs = (_bfd_elf_link_read_relocs
2853 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2854 link_info->keep_memory));
2855 if (internal_relocs == NULL)
2859 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA);
2860 local_got_refcounts = elf_local_got_refcounts (abfd);
2862 /* Get the section contents. */
2863 if (elf_section_data (sec)->this_hdr.contents != NULL)
2864 contents = elf_section_data (sec)->this_hdr.contents;
2867 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2871 irelend = internal_relocs + sec->reloc_count;
2872 for (irel = internal_relocs; irel < irelend; irel++)
2874 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2875 unsigned int r_symndx;
2876 struct elf_link_hash_entry *h;
2877 bfd_boolean converted;
2879 if (r_type != R_X86_64_GOTPCRELX
2880 && r_type != R_X86_64_REX_GOTPCRELX
2881 && r_type != R_X86_64_GOTPCREL)
2884 r_symndx = htab->r_sym (irel->r_info);
2885 if (r_symndx < symtab_hdr->sh_info)
2886 h = _bfd_elf_x86_get_local_sym_hash (htab, sec->owner,
2887 (const Elf_Internal_Rela *) irel,
2891 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
2892 while (h->root.type == bfd_link_hash_indirect
2893 || h->root.type == bfd_link_hash_warning)
2894 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2897 /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
2898 if (h != NULL && h->type == STT_GNU_IFUNC)
2902 if (!elf_x86_64_convert_load_reloc (abfd, sec, contents, irel, h,
2903 &converted, link_info))
2908 changed = converted;
2911 if (h->got.refcount > 0)
2912 h->got.refcount -= 1;
2916 if (local_got_refcounts != NULL
2917 && local_got_refcounts[r_symndx] > 0)
2918 local_got_refcounts[r_symndx] -= 1;
2923 if (contents != NULL
2924 && elf_section_data (sec)->this_hdr.contents != contents)
2926 if (!changed && !link_info->keep_memory)
2930 /* Cache the section contents for elf_link_input_bfd. */
2931 elf_section_data (sec)->this_hdr.contents = contents;
2935 if (elf_section_data (sec)->relocs != internal_relocs)
2938 free (internal_relocs);
2940 elf_section_data (sec)->relocs = internal_relocs;
2946 if (contents != NULL
2947 && elf_section_data (sec)->this_hdr.contents != contents)
2949 if (internal_relocs != NULL
2950 && elf_section_data (sec)->relocs != internal_relocs)
2951 free (internal_relocs);
2955 /* Set the sizes of the dynamic sections. */
2958 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2959 struct bfd_link_info *info)
2961 struct elf_x86_link_hash_table *htab;
2966 const struct elf_backend_data *bed;
2968 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
2971 bed = get_elf_backend_data (output_bfd);
2973 dynobj = htab->elf.dynobj;
2977 /* Set up .got offsets for local syms, and space for local dynamic
2979 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2981 bfd_signed_vma *local_got;
2982 bfd_signed_vma *end_local_got;
2983 char *local_tls_type;
2984 bfd_vma *local_tlsdesc_gotent;
2985 bfd_size_type locsymcount;
2986 Elf_Internal_Shdr *symtab_hdr;
2989 if (! is_x86_64_elf (ibfd))
2992 for (s = ibfd->sections; s != NULL; s = s->next)
2994 struct elf_dyn_relocs *p;
2996 if (!elf_x86_64_convert_load (ibfd, s, info))
2999 for (p = (struct elf_dyn_relocs *)
3000 (elf_section_data (s)->local_dynrel);
3004 if (!bfd_is_abs_section (p->sec)
3005 && bfd_is_abs_section (p->sec->output_section))
3007 /* Input section has been discarded, either because
3008 it is a copy of a linkonce section or due to
3009 linker script /DISCARD/, so we'll be discarding
3012 else if (p->count != 0)
3014 srel = elf_section_data (p->sec)->sreloc;
3015 srel->size += p->count * bed->s->sizeof_rela;
3016 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3017 && (info->flags & DF_TEXTREL) == 0)
3019 info->flags |= DF_TEXTREL;
3020 if ((info->warn_shared_textrel && bfd_link_pic (info))
3021 || info->error_textrel)
3022 /* xgettext:c-format */
3023 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3024 p->sec->owner, p->sec);
3030 local_got = elf_local_got_refcounts (ibfd);
3034 symtab_hdr = &elf_symtab_hdr (ibfd);
3035 locsymcount = symtab_hdr->sh_info;
3036 end_local_got = local_got + locsymcount;
3037 local_tls_type = elf_x86_local_got_tls_type (ibfd);
3038 local_tlsdesc_gotent = elf_x86_local_tlsdesc_gotent (ibfd);
3040 srel = htab->elf.srelgot;
3041 for (; local_got < end_local_got;
3042 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3044 *local_tlsdesc_gotent = (bfd_vma) -1;
3047 if (GOT_TLS_GDESC_P (*local_tls_type))
3049 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3050 - elf_x86_64_compute_jump_table_size (htab);
3051 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3052 *local_got = (bfd_vma) -2;
3054 if (! GOT_TLS_GDESC_P (*local_tls_type)
3055 || GOT_TLS_GD_P (*local_tls_type))
3057 *local_got = s->size;
3058 s->size += GOT_ENTRY_SIZE;
3059 if (GOT_TLS_GD_P (*local_tls_type))
3060 s->size += GOT_ENTRY_SIZE;
3062 if (bfd_link_pic (info)
3063 || GOT_TLS_GD_ANY_P (*local_tls_type)
3064 || *local_tls_type == GOT_TLS_IE)
3066 if (GOT_TLS_GDESC_P (*local_tls_type))
3068 htab->elf.srelplt->size
3069 += bed->s->sizeof_rela;
3070 htab->tlsdesc_plt = (bfd_vma) -1;
3072 if (! GOT_TLS_GDESC_P (*local_tls_type)
3073 || GOT_TLS_GD_P (*local_tls_type))
3074 srel->size += bed->s->sizeof_rela;
3078 *local_got = (bfd_vma) -1;
3082 if (htab->tls_ld_or_ldm_got.refcount > 0)
3084 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3086 htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size;
3087 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3088 htab->elf.srelgot->size += bed->s->sizeof_rela;
3091 htab->tls_ld_or_ldm_got.offset = -1;
3093 /* Allocate global sym .plt and .got entries, and space for global
3094 sym dynamic relocs. */
3095 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3098 /* Allocate .plt and .got entries, and space for local symbols. */
3099 htab_traverse (htab->loc_hash_table,
3100 elf_x86_64_allocate_local_dynrelocs,
3103 /* For every jump slot reserved in the sgotplt, reloc_count is
3104 incremented. However, when we reserve space for TLS descriptors,
3105 it's not incremented, so in order to compute the space reserved
3106 for them, it suffices to multiply the reloc count by the jump
3109 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3110 so that R_X86_64_IRELATIVE entries come last. */
3111 if (htab->elf.srelplt)
3113 htab->sgotplt_jump_table_size
3114 = elf_x86_64_compute_jump_table_size (htab);
3115 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3117 else if (htab->elf.irelplt)
3118 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3120 if (htab->tlsdesc_plt)
3122 /* If we're not using lazy TLS relocations, don't generate the
3123 PLT and GOT entries they require. */
3124 if ((info->flags & DF_BIND_NOW))
3125 htab->tlsdesc_plt = 0;
3128 htab->tlsdesc_got = htab->elf.sgot->size;
3129 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3130 /* Reserve room for the initial entry.
3131 FIXME: we could probably do away with it in this case. */
3132 if (htab->elf.splt->size == 0)
3133 htab->elf.splt->size = htab->plt.plt_entry_size;
3134 htab->tlsdesc_plt = htab->elf.splt->size;
3135 htab->elf.splt->size += htab->plt.plt_entry_size;
3139 if (htab->elf.sgotplt)
3141 /* Don't allocate .got.plt section if there are no GOT nor PLT
3142 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3143 if ((htab->elf.hgot == NULL
3144 || !htab->elf.hgot->ref_regular_nonweak)
3145 && (htab->elf.sgotplt->size
3146 == get_elf_backend_data (output_bfd)->got_header_size)
3147 && (htab->elf.splt == NULL
3148 || htab->elf.splt->size == 0)
3149 && (htab->elf.sgot == NULL
3150 || htab->elf.sgot->size == 0)
3151 && (htab->elf.iplt == NULL
3152 || htab->elf.iplt->size == 0)
3153 && (htab->elf.igotplt == NULL
3154 || htab->elf.igotplt->size == 0))
3155 htab->elf.sgotplt->size = 0;
3158 if (_bfd_elf_eh_frame_present (info))
3160 if (htab->plt_eh_frame != NULL
3161 && htab->elf.splt != NULL
3162 && htab->elf.splt->size != 0
3163 && !bfd_is_abs_section (htab->elf.splt->output_section))
3164 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
3166 if (htab->plt_got_eh_frame != NULL
3167 && htab->plt_got != NULL
3168 && htab->plt_got->size != 0
3169 && !bfd_is_abs_section (htab->plt_got->output_section))
3170 htab->plt_got_eh_frame->size
3171 = htab->non_lazy_plt->eh_frame_plt_size;
3173 /* Unwind info for the second PLT and .plt.got sections are
3175 if (htab->plt_second_eh_frame != NULL
3176 && htab->plt_second != NULL
3177 && htab->plt_second->size != 0
3178 && !bfd_is_abs_section (htab->plt_second->output_section))
3179 htab->plt_second_eh_frame->size
3180 = htab->non_lazy_plt->eh_frame_plt_size;
3183 /* We now have determined the sizes of the various dynamic sections.
3184 Allocate memory for them. */
3186 for (s = dynobj->sections; s != NULL; s = s->next)
3188 if ((s->flags & SEC_LINKER_CREATED) == 0)
3191 if (s == htab->elf.splt
3192 || s == htab->elf.sgot
3193 || s == htab->elf.sgotplt
3194 || s == htab->elf.iplt
3195 || s == htab->elf.igotplt
3196 || s == htab->plt_second
3197 || s == htab->plt_got
3198 || s == htab->plt_eh_frame
3199 || s == htab->plt_got_eh_frame
3200 || s == htab->plt_second_eh_frame
3201 || s == htab->elf.sdynbss
3202 || s == htab->elf.sdynrelro)
3204 /* Strip this section if we don't need it; see the
3207 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3209 if (s->size != 0 && s != htab->elf.srelplt)
3212 /* We use the reloc_count field as a counter if we need
3213 to copy relocs into the output file. */
3214 if (s != htab->elf.srelplt)
3219 /* It's not one of our sections, so don't allocate space. */
3225 /* If we don't need this section, strip it from the
3226 output file. This is mostly to handle .rela.bss and
3227 .rela.plt. We must create both sections in
3228 create_dynamic_sections, because they must be created
3229 before the linker maps input sections to output
3230 sections. The linker does that before
3231 adjust_dynamic_symbol is called, and it is that
3232 function which decides whether anything needs to go
3233 into these sections. */
3235 s->flags |= SEC_EXCLUDE;
3239 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3242 /* Allocate memory for the section contents. We use bfd_zalloc
3243 here in case unused entries are not reclaimed before the
3244 section's contents are written out. This should not happen,
3245 but this way if it does, we get a R_X86_64_NONE reloc instead
3247 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3248 if (s->contents == NULL)
3252 if (htab->plt_eh_frame != NULL
3253 && htab->plt_eh_frame->contents != NULL)
3255 memcpy (htab->plt_eh_frame->contents,
3256 htab->plt.eh_frame_plt, htab->plt_eh_frame->size);
3257 bfd_put_32 (dynobj, htab->elf.splt->size,
3258 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3261 if (htab->plt_got_eh_frame != NULL
3262 && htab->plt_got_eh_frame->contents != NULL)
3264 memcpy (htab->plt_got_eh_frame->contents,
3265 htab->non_lazy_plt->eh_frame_plt,
3266 htab->plt_got_eh_frame->size);
3267 bfd_put_32 (dynobj, htab->plt_got->size,
3268 (htab->plt_got_eh_frame->contents
3269 + PLT_FDE_LEN_OFFSET));
3272 if (htab->plt_second_eh_frame != NULL
3273 && htab->plt_second_eh_frame->contents != NULL)
3275 memcpy (htab->plt_second_eh_frame->contents,
3276 htab->non_lazy_plt->eh_frame_plt,
3277 htab->plt_second_eh_frame->size);
3278 bfd_put_32 (dynobj, htab->plt_second->size,
3279 (htab->plt_second_eh_frame->contents
3280 + PLT_FDE_LEN_OFFSET));
3283 if (htab->elf.dynamic_sections_created)
3285 /* Add some entries to the .dynamic section. We fill in the
3286 values later, in elf_x86_64_finish_dynamic_sections, but we
3287 must add the entries now so that we get the correct size for
3288 the .dynamic section. The DT_DEBUG entry is filled in by the
3289 dynamic linker and used by the debugger. */
3290 #define add_dynamic_entry(TAG, VAL) \
3291 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3293 if (bfd_link_executable (info))
3295 if (!add_dynamic_entry (DT_DEBUG, 0))
3299 if (htab->elf.splt->size != 0)
3301 /* DT_PLTGOT is used by prelink even if there is no PLT
3303 if (!add_dynamic_entry (DT_PLTGOT, 0))
3307 if (htab->elf.srelplt->size != 0)
3309 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3310 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3311 || !add_dynamic_entry (DT_JMPREL, 0))
3315 if (htab->tlsdesc_plt
3316 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3317 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3322 if (!add_dynamic_entry (DT_RELA, 0)
3323 || !add_dynamic_entry (DT_RELASZ, 0)
3324 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3327 /* If any dynamic relocs apply to a read-only section,
3328 then we need a DT_TEXTREL entry. */
3329 if ((info->flags & DF_TEXTREL) == 0)
3330 elf_link_hash_traverse (&htab->elf,
3331 _bfd_x86_elf_readonly_dynrelocs,
3334 if ((info->flags & DF_TEXTREL) != 0)
3336 if (htab->readonly_dynrelocs_against_ifunc)
3338 info->callbacks->einfo
3339 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3340 bfd_set_error (bfd_error_bad_value);
3344 if (!add_dynamic_entry (DT_TEXTREL, 0))
3349 #undef add_dynamic_entry
3354 /* Return the relocation value for @tpoff relocation
3355 if STT_TLS virtual address is ADDRESS. */
3358 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3360 struct elf_link_hash_table *htab = elf_hash_table (info);
3361 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3362 bfd_vma static_tls_size;
3364 /* If tls_segment is NULL, we should have signalled an error already. */
3365 if (htab->tls_sec == NULL)
3368 /* Consider special static TLS alignment requirements. */
3369 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3370 return address - static_tls_size - htab->tls_sec->vma;
3373 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3377 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3379 /* Opcode Instruction
3382 0x0f 0x8x conditional jump */
3384 && (contents [offset - 1] == 0xe8
3385 || contents [offset - 1] == 0xe9))
3387 && contents [offset - 2] == 0x0f
3388 && (contents [offset - 1] & 0xf0) == 0x80));
3391 /* Relocate an x86_64 ELF section. */
3394 elf_x86_64_relocate_section (bfd *output_bfd,
3395 struct bfd_link_info *info,
3397 asection *input_section,
3399 Elf_Internal_Rela *relocs,
3400 Elf_Internal_Sym *local_syms,
3401 asection **local_sections)
3403 struct elf_x86_link_hash_table *htab;
3404 Elf_Internal_Shdr *symtab_hdr;
3405 struct elf_link_hash_entry **sym_hashes;
3406 bfd_vma *local_got_offsets;
3407 bfd_vma *local_tlsdesc_gotents;
3408 Elf_Internal_Rela *rel;
3409 Elf_Internal_Rela *wrel;
3410 Elf_Internal_Rela *relend;
3411 unsigned int plt_entry_size;
3413 BFD_ASSERT (is_x86_64_elf (input_bfd));
3415 /* Skip if check_relocs failed. */
3416 if (input_section->check_relocs_failed)
3419 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
3422 plt_entry_size = htab->plt.plt_entry_size;
3423 symtab_hdr = &elf_symtab_hdr (input_bfd);
3424 sym_hashes = elf_sym_hashes (input_bfd);
3425 local_got_offsets = elf_local_got_offsets (input_bfd);
3426 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
3428 _bfd_x86_elf_set_tls_module_base (info);
3430 rel = wrel = relocs;
3431 relend = relocs + input_section->reloc_count;
3432 for (; rel < relend; wrel++, rel++)
3434 unsigned int r_type;
3435 reloc_howto_type *howto;
3436 unsigned long r_symndx;
3437 struct elf_link_hash_entry *h;
3438 struct elf_x86_link_hash_entry *eh;
3439 Elf_Internal_Sym *sym;
3441 bfd_vma off, offplt, plt_offset;
3443 bfd_boolean unresolved_reloc;
3444 bfd_reloc_status_type r;
3446 asection *base_got, *resolved_plt;
3448 bfd_boolean resolved_to_zero;
3449 bfd_boolean relative_reloc;
3451 r_type = ELF32_R_TYPE (rel->r_info);
3452 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3453 || r_type == (int) R_X86_64_GNU_VTENTRY)
3460 if (r_type >= (int) R_X86_64_standard)
3461 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
3463 if (r_type != (int) R_X86_64_32
3464 || ABI_64_P (output_bfd))
3465 howto = x86_64_elf_howto_table + r_type;
3467 howto = (x86_64_elf_howto_table
3468 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3469 r_symndx = htab->r_sym (rel->r_info);
3473 unresolved_reloc = FALSE;
3474 if (r_symndx < symtab_hdr->sh_info)
3476 sym = local_syms + r_symndx;
3477 sec = local_sections[r_symndx];
3479 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3481 st_size = sym->st_size;
3483 /* Relocate against local STT_GNU_IFUNC symbol. */
3484 if (!bfd_link_relocatable (info)
3485 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3487 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd,
3492 /* Set STT_GNU_IFUNC symbol value. */
3493 h->root.u.def.value = sym->st_value;
3494 h->root.u.def.section = sec;
3499 bfd_boolean warned ATTRIBUTE_UNUSED;
3500 bfd_boolean ignored ATTRIBUTE_UNUSED;
3502 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3503 r_symndx, symtab_hdr, sym_hashes,
3505 unresolved_reloc, warned, ignored);
3509 if (sec != NULL && discarded_section (sec))
3511 _bfd_clear_contents (howto, input_bfd, input_section,
3512 contents + rel->r_offset);
3513 wrel->r_offset = rel->r_offset;
3517 /* For ld -r, remove relocations in debug sections against
3518 sections defined in discarded sections. Not done for
3519 eh_frame editing code expects to be present. */
3520 if (bfd_link_relocatable (info)
3521 && (input_section->flags & SEC_DEBUGGING))
3527 if (bfd_link_relocatable (info))
3534 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3536 if (r_type == R_X86_64_64)
3538 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3539 zero-extend it to 64bit if addend is zero. */
3540 r_type = R_X86_64_32;
3541 memset (contents + rel->r_offset + 4, 0, 4);
3543 else if (r_type == R_X86_64_SIZE64)
3545 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3546 zero-extend it to 64bit if addend is zero. */
3547 r_type = R_X86_64_SIZE32;
3548 memset (contents + rel->r_offset + 4, 0, 4);
3552 eh = (struct elf_x86_link_hash_entry *) h;
3554 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3555 it here if it is defined in a non-shared object. */
3557 && h->type == STT_GNU_IFUNC
3563 if ((input_section->flags & SEC_ALLOC) == 0)
3565 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3566 sections because such sections are not SEC_ALLOC and
3567 thus ld.so will not process them. */
3568 if ((input_section->flags & SEC_DEBUGGING) != 0)
3578 case R_X86_64_GOTPCREL:
3579 case R_X86_64_GOTPCRELX:
3580 case R_X86_64_REX_GOTPCRELX:
3581 case R_X86_64_GOTPCREL64:
3582 base_got = htab->elf.sgot;
3583 off = h->got.offset;
3585 if (base_got == NULL)
3588 if (off == (bfd_vma) -1)
3590 /* We can't use h->got.offset here to save state, or
3591 even just remember the offset, as finish_dynamic_symbol
3592 would use that as offset into .got. */
3594 if (h->plt.offset == (bfd_vma) -1)
3597 if (htab->elf.splt != NULL)
3599 plt_index = (h->plt.offset / plt_entry_size
3600 - htab->plt.has_plt0);
3601 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3602 base_got = htab->elf.sgotplt;
3606 plt_index = h->plt.offset / plt_entry_size;
3607 off = plt_index * GOT_ENTRY_SIZE;
3608 base_got = htab->elf.igotplt;
3611 if (h->dynindx == -1
3615 /* This references the local defitionion. We must
3616 initialize this entry in the global offset table.
3617 Since the offset must always be a multiple of 8,
3618 we use the least significant bit to record
3619 whether we have initialized it already.
3621 When doing a dynamic link, we create a .rela.got
3622 relocation entry to initialize the value. This
3623 is done in the finish_dynamic_symbol routine. */
3628 bfd_put_64 (output_bfd, relocation,
3629 base_got->contents + off);
3630 /* Note that this is harmless for the GOTPLT64
3631 case, as -1 | 1 still is -1. */
3637 relocation = (base_got->output_section->vma
3638 + base_got->output_offset + off);
3643 if (h->plt.offset == (bfd_vma) -1)
3645 /* Handle static pointers of STT_GNU_IFUNC symbols. */
3646 if (r_type == htab->pointer_r_type
3647 && (input_section->flags & SEC_CODE) == 0)
3648 goto do_ifunc_pointer;
3649 goto bad_ifunc_reloc;
3652 /* STT_GNU_IFUNC symbol must go through PLT. */
3653 if (htab->elf.splt != NULL)
3655 if (htab->plt_second != NULL)
3657 resolved_plt = htab->plt_second;
3658 plt_offset = eh->plt_second.offset;
3662 resolved_plt = htab->elf.splt;
3663 plt_offset = h->plt.offset;
3668 resolved_plt = htab->elf.iplt;
3669 plt_offset = h->plt.offset;
3672 relocation = (resolved_plt->output_section->vma
3673 + resolved_plt->output_offset + plt_offset);
3679 if (h->root.root.string)
3680 name = h->root.root.string;
3682 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3685 /* xgettext:c-format */
3686 (_("%B: relocation %s against STT_GNU_IFUNC "
3687 "symbol `%s' isn't supported"), input_bfd,
3689 bfd_set_error (bfd_error_bad_value);
3693 if (bfd_link_pic (info))
3698 if (ABI_64_P (output_bfd))
3703 if (rel->r_addend != 0)
3705 if (h->root.root.string)
3706 name = h->root.root.string;
3708 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3711 /* xgettext:c-format */
3712 (_("%B: relocation %s against STT_GNU_IFUNC "
3713 "symbol `%s' has non-zero addend: %Ld"),
3714 input_bfd, howto->name, name, rel->r_addend);
3715 bfd_set_error (bfd_error_bad_value);
3719 /* Generate dynamic relcoation only when there is a
3720 non-GOT reference in a shared object or there is no
3722 if ((bfd_link_pic (info) && h->non_got_ref)
3723 || h->plt.offset == (bfd_vma) -1)
3725 Elf_Internal_Rela outrel;
3728 /* Need a dynamic relocation to get the real function
3730 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3734 if (outrel.r_offset == (bfd_vma) -1
3735 || outrel.r_offset == (bfd_vma) -2)
3738 outrel.r_offset += (input_section->output_section->vma
3739 + input_section->output_offset);
3741 if (h->dynindx == -1
3743 || bfd_link_executable (info))
3745 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3746 h->root.root.string,
3747 h->root.u.def.section->owner);
3749 /* This symbol is resolved locally. */
3750 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3751 outrel.r_addend = (h->root.u.def.value
3752 + h->root.u.def.section->output_section->vma
3753 + h->root.u.def.section->output_offset);
3757 outrel.r_info = htab->r_info (h->dynindx, r_type);
3758 outrel.r_addend = 0;
3761 /* Dynamic relocations are stored in
3762 1. .rela.ifunc section in PIC object.
3763 2. .rela.got section in dynamic executable.
3764 3. .rela.iplt section in static executable. */
3765 if (bfd_link_pic (info))
3766 sreloc = htab->elf.irelifunc;
3767 else if (htab->elf.splt != NULL)
3768 sreloc = htab->elf.srelgot;
3770 sreloc = htab->elf.irelplt;
3771 elf_append_rela (output_bfd, sreloc, &outrel);
3773 /* If this reloc is against an external symbol, we
3774 do not want to fiddle with the addend. Otherwise,
3775 we need to include the symbol value so that it
3776 becomes an addend for the dynamic reloc. For an
3777 internal symbol, we have updated addend. */
3782 case R_X86_64_PC32_BND:
3784 case R_X86_64_PLT32:
3785 case R_X86_64_PLT32_BND:
3790 resolved_to_zero = (eh != NULL
3791 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
3796 /* When generating a shared object, the relocations handled here are
3797 copied into the output file to be resolved at run time. */
3800 case R_X86_64_GOT32:
3801 case R_X86_64_GOT64:
3802 /* Relocation is to the entry for this symbol in the global
3804 case R_X86_64_GOTPCREL:
3805 case R_X86_64_GOTPCRELX:
3806 case R_X86_64_REX_GOTPCRELX:
3807 case R_X86_64_GOTPCREL64:
3808 /* Use global offset table entry as symbol value. */
3809 case R_X86_64_GOTPLT64:
3810 /* This is obsolete and treated the same as GOT64. */
3811 base_got = htab->elf.sgot;
3813 if (htab->elf.sgot == NULL)
3816 relative_reloc = FALSE;
3821 off = h->got.offset;
3823 && h->plt.offset != (bfd_vma)-1
3824 && off == (bfd_vma)-1)
3826 /* We can't use h->got.offset here to save
3827 state, or even just remember the offset, as
3828 finish_dynamic_symbol would use that as offset into
3830 bfd_vma plt_index = (h->plt.offset / plt_entry_size
3831 - htab->plt.has_plt0);
3832 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3833 base_got = htab->elf.sgotplt;
3836 dyn = htab->elf.dynamic_sections_created;
3838 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
3839 || (bfd_link_pic (info)
3840 && SYMBOL_REFERENCES_LOCAL (info, h))
3841 || (ELF_ST_VISIBILITY (h->other)
3842 && h->root.type == bfd_link_hash_undefweak))
3844 /* This is actually a static link, or it is a -Bsymbolic
3845 link and the symbol is defined locally, or the symbol
3846 was forced to be local because of a version file. We
3847 must initialize this entry in the global offset table.
3848 Since the offset must always be a multiple of 8, we
3849 use the least significant bit to record whether we
3850 have initialized it already.
3852 When doing a dynamic link, we create a .rela.got
3853 relocation entry to initialize the value. This is
3854 done in the finish_dynamic_symbol routine. */
3859 bfd_put_64 (output_bfd, relocation,
3860 base_got->contents + off);
3861 /* Note that this is harmless for the GOTPLT64 case,
3862 as -1 | 1 still is -1. */
3865 if (h->dynindx == -1
3867 && h->root.type != bfd_link_hash_undefweak
3868 && bfd_link_pic (info))
3870 /* If this symbol isn't dynamic in PIC,
3871 generate R_X86_64_RELATIVE here. */
3872 eh->no_finish_dynamic_symbol = 1;
3873 relative_reloc = TRUE;
3878 unresolved_reloc = FALSE;
3882 if (local_got_offsets == NULL)
3885 off = local_got_offsets[r_symndx];
3887 /* The offset must always be a multiple of 8. We use
3888 the least significant bit to record whether we have
3889 already generated the necessary reloc. */
3894 bfd_put_64 (output_bfd, relocation,
3895 base_got->contents + off);
3896 local_got_offsets[r_symndx] |= 1;
3898 if (bfd_link_pic (info))
3899 relative_reloc = TRUE;
3906 Elf_Internal_Rela outrel;
3908 /* We need to generate a R_X86_64_RELATIVE reloc
3909 for the dynamic linker. */
3910 s = htab->elf.srelgot;
3914 outrel.r_offset = (base_got->output_section->vma
3915 + base_got->output_offset
3917 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3918 outrel.r_addend = relocation;
3919 elf_append_rela (output_bfd, s, &outrel);
3922 if (off >= (bfd_vma) -2)
3925 relocation = base_got->output_section->vma
3926 + base_got->output_offset + off;
3927 if (r_type != R_X86_64_GOTPCREL
3928 && r_type != R_X86_64_GOTPCRELX
3929 && r_type != R_X86_64_REX_GOTPCRELX
3930 && r_type != R_X86_64_GOTPCREL64)
3931 relocation -= htab->elf.sgotplt->output_section->vma
3932 - htab->elf.sgotplt->output_offset;
3936 case R_X86_64_GOTOFF64:
3937 /* Relocation is relative to the start of the global offset
3940 /* Check to make sure it isn't a protected function or data
3941 symbol for shared library since it may not be local when
3942 used as function address or with copy relocation. We also
3943 need to make sure that a symbol is referenced locally. */
3944 if (bfd_link_pic (info) && h)
3946 if (!h->def_regular)
3950 switch (ELF_ST_VISIBILITY (h->other))
3953 v = _("hidden symbol");
3956 v = _("internal symbol");
3959 v = _("protected symbol");
3967 /* xgettext:c-format */
3968 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s"
3969 " `%s' can not be used when making a shared object"),
3970 input_bfd, v, h->root.root.string);
3971 bfd_set_error (bfd_error_bad_value);
3974 else if (!bfd_link_executable (info)
3975 && !SYMBOL_REFERENCES_LOCAL (info, h)
3976 && (h->type == STT_FUNC
3977 || h->type == STT_OBJECT)
3978 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3981 /* xgettext:c-format */
3982 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s"
3983 " `%s' can not be used when making a shared object"),
3985 h->type == STT_FUNC ? "function" : "data",
3986 h->root.root.string);
3987 bfd_set_error (bfd_error_bad_value);
3992 /* Note that sgot is not involved in this
3993 calculation. We always want the start of .got.plt. If we
3994 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3995 permitted by the ABI, we might have to change this
3997 relocation -= htab->elf.sgotplt->output_section->vma
3998 + htab->elf.sgotplt->output_offset;
4001 case R_X86_64_GOTPC32:
4002 case R_X86_64_GOTPC64:
4003 /* Use global offset table as symbol value. */
4004 relocation = htab->elf.sgotplt->output_section->vma
4005 + htab->elf.sgotplt->output_offset;
4006 unresolved_reloc = FALSE;
4009 case R_X86_64_PLTOFF64:
4010 /* Relocation is PLT entry relative to GOT. For local
4011 symbols it's the symbol itself relative to GOT. */
4013 /* See PLT32 handling. */
4014 && (h->plt.offset != (bfd_vma) -1
4015 || eh->plt_got.offset != (bfd_vma) -1)
4016 && htab->elf.splt != NULL)
4018 if (eh->plt_got.offset != (bfd_vma) -1)
4020 /* Use the GOT PLT. */
4021 resolved_plt = htab->plt_got;
4022 plt_offset = eh->plt_got.offset;
4024 else if (htab->plt_second != NULL)
4026 resolved_plt = htab->plt_second;
4027 plt_offset = eh->plt_second.offset;
4031 resolved_plt = htab->elf.splt;
4032 plt_offset = h->plt.offset;
4035 relocation = (resolved_plt->output_section->vma
4036 + resolved_plt->output_offset
4038 unresolved_reloc = FALSE;
4041 relocation -= htab->elf.sgotplt->output_section->vma
4042 + htab->elf.sgotplt->output_offset;
4045 case R_X86_64_PLT32:
4046 case R_X86_64_PLT32_BND:
4047 /* Relocation is to the entry for this symbol in the
4048 procedure linkage table. */
4050 /* Resolve a PLT32 reloc against a local symbol directly,
4051 without using the procedure linkage table. */
4055 if ((h->plt.offset == (bfd_vma) -1
4056 && eh->plt_got.offset == (bfd_vma) -1)
4057 || htab->elf.splt == NULL)
4059 /* We didn't make a PLT entry for this symbol. This
4060 happens when statically linking PIC code, or when
4061 using -Bsymbolic. */
4065 if (h->plt.offset != (bfd_vma) -1)
4067 if (htab->plt_second != NULL)
4069 resolved_plt = htab->plt_second;
4070 plt_offset = eh->plt_second.offset;
4074 resolved_plt = htab->elf.splt;
4075 plt_offset = h->plt.offset;
4080 /* Use the GOT PLT. */
4081 resolved_plt = htab->plt_got;
4082 plt_offset = eh->plt_got.offset;
4085 relocation = (resolved_plt->output_section->vma
4086 + resolved_plt->output_offset
4088 unresolved_reloc = FALSE;
4091 case R_X86_64_SIZE32:
4092 case R_X86_64_SIZE64:
4093 /* Set to symbol size. */
4094 relocation = st_size;
4100 case R_X86_64_PC32_BND:
4101 /* Don't complain about -fPIC if the symbol is undefined when
4102 building executable unless it is unresolved weak symbol or
4103 -z nocopyreloc is used. */
4104 if ((input_section->flags & SEC_ALLOC) != 0
4105 && (input_section->flags & SEC_READONLY) != 0
4107 && ((bfd_link_executable (info)
4108 && ((h->root.type == bfd_link_hash_undefweak
4109 && !resolved_to_zero)
4110 || ((info->nocopyreloc
4111 || (eh->def_protected
4112 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
4114 && !(h->root.u.def.section->flags & SEC_CODE))))
4115 || bfd_link_dll (info)))
4117 bfd_boolean fail = FALSE;
4119 = ((r_type == R_X86_64_PC32
4120 || r_type == R_X86_64_PC32_BND)
4121 && is_32bit_relative_branch (contents, rel->r_offset));
4123 if (SYMBOL_REFERENCES_LOCAL (info, h))
4125 /* Symbol is referenced locally. Make sure it is
4126 defined locally or for a branch. */
4127 fail = (!(h->def_regular || ELF_COMMON_DEF_P (h))
4130 else if (!(bfd_link_pie (info)
4131 && (h->needs_copy || eh->needs_copy)))
4133 /* Symbol doesn't need copy reloc and isn't referenced
4134 locally. We only allow branch to symbol with
4135 non-default visibility. */
4137 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4141 return elf_x86_64_need_pic (info, input_bfd, input_section,
4142 h, NULL, NULL, howto);
4151 /* FIXME: The ABI says the linker should make sure the value is
4152 the same when it's zeroextended to 64 bit. */
4155 if ((input_section->flags & SEC_ALLOC) == 0)
4158 /* Don't copy a pc-relative relocation into the output file
4159 if the symbol needs copy reloc or the symbol is undefined
4160 when building executable. Copy dynamic function pointer
4161 relocations. Don't generate dynamic relocations against
4162 resolved undefined weak symbols in PIE. */
4163 if ((bfd_link_pic (info)
4164 && !(bfd_link_pie (info)
4168 || h->root.type == bfd_link_hash_undefined)
4169 && (IS_X86_64_PCREL_TYPE (r_type)
4170 || r_type == R_X86_64_SIZE32
4171 || r_type == R_X86_64_SIZE64))
4173 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4174 && !resolved_to_zero)
4175 || h->root.type != bfd_link_hash_undefweak))
4176 && ((! IS_X86_64_PCREL_TYPE (r_type)
4177 && r_type != R_X86_64_SIZE32
4178 && r_type != R_X86_64_SIZE64)
4179 || ! SYMBOL_CALLS_LOCAL (info, h)))
4180 || (ELIMINATE_COPY_RELOCS
4181 && !bfd_link_pic (info)
4185 || eh->func_pointer_refcount > 0
4186 || (h->root.type == bfd_link_hash_undefweak
4187 && !resolved_to_zero))
4188 && ((h->def_dynamic && !h->def_regular)
4189 /* Undefined weak symbol is bound locally when
4191 || h->root.type == bfd_link_hash_undefined)))
4193 Elf_Internal_Rela outrel;
4194 bfd_boolean skip, relocate;
4197 /* When generating a shared object, these relocations
4198 are copied into the output file to be resolved at run
4204 _bfd_elf_section_offset (output_bfd, info, input_section,
4206 if (outrel.r_offset == (bfd_vma) -1)
4208 else if (outrel.r_offset == (bfd_vma) -2)
4209 skip = TRUE, relocate = TRUE;
4211 outrel.r_offset += (input_section->output_section->vma
4212 + input_section->output_offset);
4215 memset (&outrel, 0, sizeof outrel);
4217 /* h->dynindx may be -1 if this symbol was marked to
4221 && (IS_X86_64_PCREL_TYPE (r_type)
4222 || !(bfd_link_executable (info)
4223 || SYMBOLIC_BIND (info, h))
4224 || ! h->def_regular))
4226 outrel.r_info = htab->r_info (h->dynindx, r_type);
4227 outrel.r_addend = rel->r_addend;
4231 /* This symbol is local, or marked to become local.
4232 When relocation overflow check is disabled, we
4233 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
4234 if (r_type == htab->pointer_r_type
4235 || (r_type == R_X86_64_32
4236 && info->no_reloc_overflow_check))
4239 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4240 outrel.r_addend = relocation + rel->r_addend;
4242 else if (r_type == R_X86_64_64
4243 && !ABI_64_P (output_bfd))
4246 outrel.r_info = htab->r_info (0,
4247 R_X86_64_RELATIVE64);
4248 outrel.r_addend = relocation + rel->r_addend;
4249 /* Check addend overflow. */
4250 if ((outrel.r_addend & 0x80000000)
4251 != (rel->r_addend & 0x80000000))
4254 int addend = rel->r_addend;
4255 if (h && h->root.root.string)
4256 name = h->root.root.string;
4258 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4261 /* xgettext:c-format */
4262 (_("%B: addend %s%#x in relocation %s against "
4263 "symbol `%s' at %#Lx in section `%A' is "
4265 input_bfd, addend < 0 ? "-" : "", addend,
4266 howto->name, name, rel->r_offset, input_section);
4267 bfd_set_error (bfd_error_bad_value);
4275 if (bfd_is_abs_section (sec))
4277 else if (sec == NULL || sec->owner == NULL)
4279 bfd_set_error (bfd_error_bad_value);
4286 /* We are turning this relocation into one
4287 against a section symbol. It would be
4288 proper to subtract the symbol's value,
4289 osec->vma, from the emitted reloc addend,
4290 but ld.so expects buggy relocs. */
4291 osec = sec->output_section;
4292 sindx = elf_section_data (osec)->dynindx;
4295 asection *oi = htab->elf.text_index_section;
4296 sindx = elf_section_data (oi)->dynindx;
4298 BFD_ASSERT (sindx != 0);
4301 outrel.r_info = htab->r_info (sindx, r_type);
4302 outrel.r_addend = relocation + rel->r_addend;
4306 sreloc = elf_section_data (input_section)->sreloc;
4308 if (sreloc == NULL || sreloc->contents == NULL)
4310 r = bfd_reloc_notsupported;
4311 goto check_relocation_error;
4314 elf_append_rela (output_bfd, sreloc, &outrel);
4316 /* If this reloc is against an external symbol, we do
4317 not want to fiddle with the addend. Otherwise, we
4318 need to include the symbol value so that it becomes
4319 an addend for the dynamic reloc. */
4326 case R_X86_64_TLSGD:
4327 case R_X86_64_GOTPC32_TLSDESC:
4328 case R_X86_64_TLSDESC_CALL:
4329 case R_X86_64_GOTTPOFF:
4330 tls_type = GOT_UNKNOWN;
4331 if (h == NULL && local_got_offsets)
4332 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
4334 tls_type = elf_x86_hash_entry (h)->tls_type;
4336 if (! elf_x86_64_tls_transition (info, input_bfd,
4337 input_section, contents,
4338 symtab_hdr, sym_hashes,
4339 &r_type, tls_type, rel,
4340 relend, h, r_symndx, TRUE))
4343 if (r_type == R_X86_64_TPOFF32)
4345 bfd_vma roff = rel->r_offset;
4347 BFD_ASSERT (! unresolved_reloc);
4349 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4351 /* GD->LE transition. For 64bit, change
4352 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4353 .word 0x6666; rex64; call __tls_get_addr@PLT
4355 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4357 call *__tls_get_addr@GOTPCREL(%rip)
4358 which may be converted to
4359 addr32 call __tls_get_addr
4362 leaq foo@tpoff(%rax), %rax
4364 leaq foo@tlsgd(%rip), %rdi
4365 .word 0x6666; rex64; call __tls_get_addr@PLT
4367 leaq foo@tlsgd(%rip), %rdi
4369 call *__tls_get_addr@GOTPCREL(%rip)
4370 which may be converted to
4371 addr32 call __tls_get_addr
4374 leaq foo@tpoff(%rax), %rax
4375 For largepic, change:
4376 leaq foo@tlsgd(%rip), %rdi
4377 movabsq $__tls_get_addr@pltoff, %rax
4382 leaq foo@tpoff(%rax), %rax
4383 nopw 0x0(%rax,%rax,1) */
4385 if (ABI_64_P (output_bfd))
4387 if (contents[roff + 5] == 0xb8)
4389 memcpy (contents + roff - 3,
4390 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4391 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4395 memcpy (contents + roff - 4,
4396 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4400 memcpy (contents + roff - 3,
4401 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4403 bfd_put_32 (output_bfd,
4404 elf_x86_64_tpoff (info, relocation),
4405 contents + roff + 8 + largepic);
4406 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
4407 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
4412 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4414 /* GDesc -> LE transition.
4415 It's originally something like:
4416 leaq x@tlsdesc(%rip), %rax
4419 movl $x@tpoff, %rax. */
4421 unsigned int val, type;
4423 type = bfd_get_8 (input_bfd, contents + roff - 3);
4424 val = bfd_get_8 (input_bfd, contents + roff - 1);
4425 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4426 contents + roff - 3);
4427 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4428 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4429 contents + roff - 1);
4430 bfd_put_32 (output_bfd,
4431 elf_x86_64_tpoff (info, relocation),
4435 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4437 /* GDesc -> LE transition.
4442 bfd_put_8 (output_bfd, 0x66, contents + roff);
4443 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4446 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4448 /* IE->LE transition:
4449 For 64bit, originally it can be one of:
4450 movq foo@gottpoff(%rip), %reg
4451 addq foo@gottpoff(%rip), %reg
4454 leaq foo(%reg), %reg
4456 For 32bit, originally it can be one of:
4457 movq foo@gottpoff(%rip), %reg
4458 addl foo@gottpoff(%rip), %reg
4461 leal foo(%reg), %reg
4464 unsigned int val, type, reg;
4467 val = bfd_get_8 (input_bfd, contents + roff - 3);
4470 type = bfd_get_8 (input_bfd, contents + roff - 2);
4471 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4477 bfd_put_8 (output_bfd, 0x49,
4478 contents + roff - 3);
4479 else if (!ABI_64_P (output_bfd) && val == 0x44)
4480 bfd_put_8 (output_bfd, 0x41,
4481 contents + roff - 3);
4482 bfd_put_8 (output_bfd, 0xc7,
4483 contents + roff - 2);
4484 bfd_put_8 (output_bfd, 0xc0 | reg,
4485 contents + roff - 1);
4489 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4492 bfd_put_8 (output_bfd, 0x49,
4493 contents + roff - 3);
4494 else if (!ABI_64_P (output_bfd) && val == 0x44)
4495 bfd_put_8 (output_bfd, 0x41,
4496 contents + roff - 3);
4497 bfd_put_8 (output_bfd, 0x81,
4498 contents + roff - 2);
4499 bfd_put_8 (output_bfd, 0xc0 | reg,
4500 contents + roff - 1);
4504 /* addq/addl -> leaq/leal */
4506 bfd_put_8 (output_bfd, 0x4d,
4507 contents + roff - 3);
4508 else if (!ABI_64_P (output_bfd) && val == 0x44)
4509 bfd_put_8 (output_bfd, 0x45,
4510 contents + roff - 3);
4511 bfd_put_8 (output_bfd, 0x8d,
4512 contents + roff - 2);
4513 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4514 contents + roff - 1);
4516 bfd_put_32 (output_bfd,
4517 elf_x86_64_tpoff (info, relocation),
4525 if (htab->elf.sgot == NULL)
4530 off = h->got.offset;
4531 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
4535 if (local_got_offsets == NULL)
4538 off = local_got_offsets[r_symndx];
4539 offplt = local_tlsdesc_gotents[r_symndx];
4546 Elf_Internal_Rela outrel;
4550 if (htab->elf.srelgot == NULL)
4553 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4555 if (GOT_TLS_GDESC_P (tls_type))
4557 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4558 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4559 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4560 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4561 + htab->elf.sgotplt->output_offset
4563 + htab->sgotplt_jump_table_size);
4564 sreloc = htab->elf.srelplt;
4566 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
4568 outrel.r_addend = 0;
4569 elf_append_rela (output_bfd, sreloc, &outrel);
4572 sreloc = htab->elf.srelgot;
4574 outrel.r_offset = (htab->elf.sgot->output_section->vma
4575 + htab->elf.sgot->output_offset + off);
4577 if (GOT_TLS_GD_P (tls_type))
4578 dr_type = R_X86_64_DTPMOD64;
4579 else if (GOT_TLS_GDESC_P (tls_type))
4582 dr_type = R_X86_64_TPOFF64;
4584 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4585 outrel.r_addend = 0;
4586 if ((dr_type == R_X86_64_TPOFF64
4587 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4588 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
4589 outrel.r_info = htab->r_info (indx, dr_type);
4591 elf_append_rela (output_bfd, sreloc, &outrel);
4593 if (GOT_TLS_GD_P (tls_type))
4597 BFD_ASSERT (! unresolved_reloc);
4598 bfd_put_64 (output_bfd,
4599 relocation - _bfd_x86_elf_dtpoff_base (info),
4600 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4604 bfd_put_64 (output_bfd, 0,
4605 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4606 outrel.r_info = htab->r_info (indx,
4608 outrel.r_offset += GOT_ENTRY_SIZE;
4609 elf_append_rela (output_bfd, sreloc,
4618 local_got_offsets[r_symndx] |= 1;
4621 if (off >= (bfd_vma) -2
4622 && ! GOT_TLS_GDESC_P (tls_type))
4624 if (r_type == ELF32_R_TYPE (rel->r_info))
4626 if (r_type == R_X86_64_GOTPC32_TLSDESC
4627 || r_type == R_X86_64_TLSDESC_CALL)
4628 relocation = htab->elf.sgotplt->output_section->vma
4629 + htab->elf.sgotplt->output_offset
4630 + offplt + htab->sgotplt_jump_table_size;
4632 relocation = htab->elf.sgot->output_section->vma
4633 + htab->elf.sgot->output_offset + off;
4634 unresolved_reloc = FALSE;
4638 bfd_vma roff = rel->r_offset;
4640 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4642 /* GD->IE transition. For 64bit, change
4643 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4644 .word 0x6666; rex64; call __tls_get_addr@PLT
4646 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4648 call *__tls_get_addr@GOTPCREL(%rip
4649 which may be converted to
4650 addr32 call __tls_get_addr
4653 addq foo@gottpoff(%rip), %rax
4655 leaq foo@tlsgd(%rip), %rdi
4656 .word 0x6666; rex64; call __tls_get_addr@PLT
4658 leaq foo@tlsgd(%rip), %rdi
4660 call *__tls_get_addr@GOTPCREL(%rip)
4661 which may be converted to
4662 addr32 call __tls_get_addr
4665 addq foo@gottpoff(%rip), %rax
4666 For largepic, change:
4667 leaq foo@tlsgd(%rip), %rdi
4668 movabsq $__tls_get_addr@pltoff, %rax
4673 addq foo@gottpoff(%rax), %rax
4674 nopw 0x0(%rax,%rax,1) */
4676 if (ABI_64_P (output_bfd))
4678 if (contents[roff + 5] == 0xb8)
4680 memcpy (contents + roff - 3,
4681 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4682 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4686 memcpy (contents + roff - 4,
4687 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4691 memcpy (contents + roff - 3,
4692 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4695 relocation = (htab->elf.sgot->output_section->vma
4696 + htab->elf.sgot->output_offset + off
4699 - input_section->output_section->vma
4700 - input_section->output_offset
4702 bfd_put_32 (output_bfd, relocation,
4703 contents + roff + 8 + largepic);
4704 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4709 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4711 /* GDesc -> IE transition.
4712 It's originally something like:
4713 leaq x@tlsdesc(%rip), %rax
4716 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4718 /* Now modify the instruction as appropriate. To
4719 turn a leaq into a movq in the form we use it, it
4720 suffices to change the second byte from 0x8d to
4722 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4724 bfd_put_32 (output_bfd,
4725 htab->elf.sgot->output_section->vma
4726 + htab->elf.sgot->output_offset + off
4728 - input_section->output_section->vma
4729 - input_section->output_offset
4734 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4736 /* GDesc -> IE transition.
4743 bfd_put_8 (output_bfd, 0x66, contents + roff);
4744 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4752 case R_X86_64_TLSLD:
4753 if (! elf_x86_64_tls_transition (info, input_bfd,
4754 input_section, contents,
4755 symtab_hdr, sym_hashes,
4756 &r_type, GOT_UNKNOWN, rel,
4757 relend, h, r_symndx, TRUE))
4760 if (r_type != R_X86_64_TLSLD)
4762 /* LD->LE transition:
4763 leaq foo@tlsld(%rip), %rdi
4764 call __tls_get_addr@PLT
4765 For 64bit, we change it into:
4766 .word 0x6666; .byte 0x66; movq %fs:0, %rax
4767 For 32bit, we change it into:
4768 nopl 0x0(%rax); movl %fs:0, %eax
4770 leaq foo@tlsld(%rip), %rdi;
4771 call *__tls_get_addr@GOTPCREL(%rip)
4772 which may be converted to
4773 addr32 call __tls_get_addr
4774 For 64bit, we change it into:
4775 .word 0x6666; .word 0x6666; movq %fs:0, %rax
4776 For 32bit, we change it into:
4777 nopw 0x0(%rax); movl %fs:0, %eax
4778 For largepic, change:
4779 leaq foo@tlsgd(%rip), %rdi
4780 movabsq $__tls_get_addr@pltoff, %rax
4784 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
4787 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4788 if (ABI_64_P (output_bfd))
4790 if (contents[rel->r_offset + 5] == 0xb8)
4791 memcpy (contents + rel->r_offset - 3,
4792 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4793 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4794 else if (contents[rel->r_offset + 4] == 0xff
4795 || contents[rel->r_offset + 4] == 0x67)
4796 memcpy (contents + rel->r_offset - 3,
4797 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
4800 memcpy (contents + rel->r_offset - 3,
4801 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4805 if (contents[rel->r_offset + 4] == 0xff)
4806 memcpy (contents + rel->r_offset - 3,
4807 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
4810 memcpy (contents + rel->r_offset - 3,
4811 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4813 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
4814 and R_X86_64_PLTOFF64. */
4820 if (htab->elf.sgot == NULL)
4823 off = htab->tls_ld_or_ldm_got.offset;
4828 Elf_Internal_Rela outrel;
4830 if (htab->elf.srelgot == NULL)
4833 outrel.r_offset = (htab->elf.sgot->output_section->vma
4834 + htab->elf.sgot->output_offset + off);
4836 bfd_put_64 (output_bfd, 0,
4837 htab->elf.sgot->contents + off);
4838 bfd_put_64 (output_bfd, 0,
4839 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4840 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4841 outrel.r_addend = 0;
4842 elf_append_rela (output_bfd, htab->elf.srelgot,
4844 htab->tls_ld_or_ldm_got.offset |= 1;
4846 relocation = htab->elf.sgot->output_section->vma
4847 + htab->elf.sgot->output_offset + off;
4848 unresolved_reloc = FALSE;
4851 case R_X86_64_DTPOFF32:
4852 if (!bfd_link_executable (info)
4853 || (input_section->flags & SEC_CODE) == 0)
4854 relocation -= _bfd_x86_elf_dtpoff_base (info);
4856 relocation = elf_x86_64_tpoff (info, relocation);
4859 case R_X86_64_TPOFF32:
4860 case R_X86_64_TPOFF64:
4861 BFD_ASSERT (bfd_link_executable (info));
4862 relocation = elf_x86_64_tpoff (info, relocation);
4865 case R_X86_64_DTPOFF64:
4866 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4867 relocation -= _bfd_x86_elf_dtpoff_base (info);
4874 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4875 because such sections are not SEC_ALLOC and thus ld.so will
4876 not process them. */
4877 if (unresolved_reloc
4878 && !((input_section->flags & SEC_DEBUGGING) != 0
4880 && _bfd_elf_section_offset (output_bfd, info, input_section,
4881 rel->r_offset) != (bfd_vma) -1)
4886 sec = h->root.u.def.section;
4887 if ((info->nocopyreloc
4888 || (eh->def_protected
4889 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
4890 && !(h->root.u.def.section->flags & SEC_CODE))
4891 return elf_x86_64_need_pic (info, input_bfd, input_section,
4892 h, NULL, NULL, howto);
4897 /* xgettext:c-format */
4898 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
4903 h->root.root.string);
4909 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4910 contents, rel->r_offset,
4911 relocation, rel->r_addend);
4913 check_relocation_error:
4914 if (r != bfd_reloc_ok)
4919 name = h->root.root.string;
4922 name = bfd_elf_string_from_elf_section (input_bfd,
4923 symtab_hdr->sh_link,
4928 name = bfd_section_name (input_bfd, sec);
4931 if (r == bfd_reloc_overflow)
4932 (*info->callbacks->reloc_overflow)
4933 (info, (h ? &h->root : NULL), name, howto->name,
4934 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
4938 /* xgettext:c-format */
4939 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
4940 input_bfd, input_section,
4941 rel->r_offset, name, (int) r);
4952 Elf_Internal_Shdr *rel_hdr;
4953 size_t deleted = rel - wrel;
4955 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
4956 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4957 if (rel_hdr->sh_size == 0)
4959 /* It is too late to remove an empty reloc section. Leave
4961 ??? What is wrong with an empty section??? */
4962 rel_hdr->sh_size = rel_hdr->sh_entsize;
4965 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
4966 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4967 input_section->reloc_count -= deleted;
4973 /* Finish up dynamic symbol handling. We set the contents of various
4974 dynamic sections here. */
4977 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4978 struct bfd_link_info *info,
4979 struct elf_link_hash_entry *h,
4980 Elf_Internal_Sym *sym)
4982 struct elf_x86_link_hash_table *htab;
4983 bfd_boolean use_plt_second;
4984 struct elf_x86_link_hash_entry *eh;
4985 bfd_boolean local_undefweak;
4987 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
4991 /* Use the second PLT section only if there is .plt section. */
4992 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
4994 eh = (struct elf_x86_link_hash_entry *) h;
4995 if (eh->no_finish_dynamic_symbol)
4998 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
4999 resolved undefined weak symbols in executable so that their
5000 references have value 0 at run-time. */
5001 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5006 if (h->plt.offset != (bfd_vma) -1)
5009 bfd_vma got_offset, plt_offset;
5010 Elf_Internal_Rela rela;
5012 asection *plt, *gotplt, *relplt, *resolved_plt;
5013 const struct elf_backend_data *bed;
5014 bfd_vma plt_got_pcrel_offset;
5016 /* When building a static executable, use .iplt, .igot.plt and
5017 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5018 if (htab->elf.splt != NULL)
5020 plt = htab->elf.splt;
5021 gotplt = htab->elf.sgotplt;
5022 relplt = htab->elf.srelplt;
5026 plt = htab->elf.iplt;
5027 gotplt = htab->elf.igotplt;
5028 relplt = htab->elf.irelplt;
5031 /* This symbol has an entry in the procedure linkage table. Set
5033 if ((h->dynindx == -1
5035 && !((h->forced_local || bfd_link_executable (info))
5037 && h->type == STT_GNU_IFUNC))
5043 /* Get the index in the procedure linkage table which
5044 corresponds to this symbol. This is the index of this symbol
5045 in all the symbols for which we are making plt entries. The
5046 first entry in the procedure linkage table is reserved.
5048 Get the offset into the .got table of the entry that
5049 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5050 bytes. The first three are reserved for the dynamic linker.
5052 For static executables, we don't reserve anything. */
5054 if (plt == htab->elf.splt)
5056 got_offset = (h->plt.offset / htab->plt.plt_entry_size
5057 - htab->plt.has_plt0);
5058 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5062 got_offset = h->plt.offset / htab->plt.plt_entry_size;
5063 got_offset = got_offset * GOT_ENTRY_SIZE;
5066 /* Fill in the entry in the procedure linkage table. */
5067 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
5068 htab->plt.plt_entry_size);
5071 memcpy (htab->plt_second->contents + eh->plt_second.offset,
5072 htab->non_lazy_plt->plt_entry,
5073 htab->non_lazy_plt->plt_entry_size);
5075 resolved_plt = htab->plt_second;
5076 plt_offset = eh->plt_second.offset;
5081 plt_offset = h->plt.offset;
5084 /* Insert the relocation positions of the plt section. */
5086 /* Put offset the PC-relative instruction referring to the GOT entry,
5087 subtracting the size of that instruction. */
5088 plt_got_pcrel_offset = (gotplt->output_section->vma
5089 + gotplt->output_offset
5091 - resolved_plt->output_section->vma
5092 - resolved_plt->output_offset
5094 - htab->plt.plt_got_insn_size);
5096 /* Check PC-relative offset overflow in PLT entry. */
5097 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5098 /* xgettext:c-format */
5099 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5100 output_bfd, h->root.root.string);
5102 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5103 (resolved_plt->contents + plt_offset
5104 + htab->plt.plt_got_offset));
5106 /* Fill in the entry in the global offset table, initially this
5107 points to the second part of the PLT entry. Leave the entry
5108 as zero for undefined weak symbol in PIE. No PLT relocation
5109 against undefined weak symbol in PIE. */
5110 if (!local_undefweak)
5112 if (htab->plt.has_plt0)
5113 bfd_put_64 (output_bfd, (plt->output_section->vma
5114 + plt->output_offset
5116 + htab->lazy_plt->plt_lazy_offset),
5117 gotplt->contents + got_offset);
5119 /* Fill in the entry in the .rela.plt section. */
5120 rela.r_offset = (gotplt->output_section->vma
5121 + gotplt->output_offset
5123 if (h->dynindx == -1
5124 || ((bfd_link_executable (info)
5125 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5127 && h->type == STT_GNU_IFUNC))
5129 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5130 h->root.root.string,
5131 h->root.u.def.section->owner);
5133 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5134 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5135 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5136 rela.r_addend = (h->root.u.def.value
5137 + h->root.u.def.section->output_section->vma
5138 + h->root.u.def.section->output_offset);
5139 /* R_X86_64_IRELATIVE comes last. */
5140 plt_index = htab->next_irelative_index--;
5144 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5146 plt_index = htab->next_jump_slot_index++;
5149 /* Don't fill the second and third slots in PLT entry for
5150 static executables nor without PLT0. */
5151 if (plt == htab->elf.splt && htab->plt.has_plt0)
5154 = h->plt.offset + htab->lazy_plt->plt_plt_insn_end;
5156 /* Put relocation index. */
5157 bfd_put_32 (output_bfd, plt_index,
5158 (plt->contents + h->plt.offset
5159 + htab->lazy_plt->plt_reloc_offset));
5161 /* Put offset for jmp .PLT0 and check for overflow. We don't
5162 check relocation index for overflow since branch displacement
5163 will overflow first. */
5164 if (plt0_offset > 0x80000000)
5165 /* xgettext:c-format */
5166 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5167 output_bfd, h->root.root.string);
5168 bfd_put_32 (output_bfd, - plt0_offset,
5169 (plt->contents + h->plt.offset
5170 + htab->lazy_plt->plt_plt_offset));
5173 bed = get_elf_backend_data (output_bfd);
5174 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5175 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5178 else if (eh->plt_got.offset != (bfd_vma) -1)
5180 bfd_vma got_offset, plt_offset;
5181 asection *plt, *got;
5182 bfd_boolean got_after_plt;
5183 int32_t got_pcrel_offset;
5185 /* Set the entry in the GOT procedure linkage table. */
5186 plt = htab->plt_got;
5187 got = htab->elf.sgot;
5188 got_offset = h->got.offset;
5190 if (got_offset == (bfd_vma) -1
5191 || (h->type == STT_GNU_IFUNC && h->def_regular)
5196 /* Use the non-lazy PLT entry template for the GOT PLT since they
5197 are the identical. */
5198 /* Fill in the entry in the GOT procedure linkage table. */
5199 plt_offset = eh->plt_got.offset;
5200 memcpy (plt->contents + plt_offset,
5201 htab->non_lazy_plt->plt_entry,
5202 htab->non_lazy_plt->plt_entry_size);
5204 /* Put offset the PC-relative instruction referring to the GOT
5205 entry, subtracting the size of that instruction. */
5206 got_pcrel_offset = (got->output_section->vma
5207 + got->output_offset
5209 - plt->output_section->vma
5210 - plt->output_offset
5212 - htab->non_lazy_plt->plt_got_insn_size);
5214 /* Check PC-relative offset overflow in GOT PLT entry. */
5215 got_after_plt = got->output_section->vma > plt->output_section->vma;
5216 if ((got_after_plt && got_pcrel_offset < 0)
5217 || (!got_after_plt && got_pcrel_offset > 0))
5218 /* xgettext:c-format */
5219 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5220 output_bfd, h->root.root.string);
5222 bfd_put_32 (output_bfd, got_pcrel_offset,
5223 (plt->contents + plt_offset
5224 + htab->non_lazy_plt->plt_got_offset));
5227 if (!local_undefweak
5229 && (h->plt.offset != (bfd_vma) -1
5230 || eh->plt_got.offset != (bfd_vma) -1))
5232 /* Mark the symbol as undefined, rather than as defined in
5233 the .plt section. Leave the value if there were any
5234 relocations where pointer equality matters (this is a clue
5235 for the dynamic linker, to make function pointer
5236 comparisons work between an application and shared
5237 library), otherwise set it to zero. If a function is only
5238 called from a binary, there is no need to slow down
5239 shared libraries because of that. */
5240 sym->st_shndx = SHN_UNDEF;
5241 if (!h->pointer_equality_needed)
5245 /* Don't generate dynamic GOT relocation against undefined weak
5246 symbol in executable. */
5247 if (h->got.offset != (bfd_vma) -1
5248 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type)
5249 && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE
5250 && !local_undefweak)
5252 Elf_Internal_Rela rela;
5253 asection *relgot = htab->elf.srelgot;
5255 /* This symbol has an entry in the global offset table. Set it
5257 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5260 rela.r_offset = (htab->elf.sgot->output_section->vma
5261 + htab->elf.sgot->output_offset
5262 + (h->got.offset &~ (bfd_vma) 1));
5264 /* If this is a static link, or it is a -Bsymbolic link and the
5265 symbol is defined locally or was forced to be local because
5266 of a version file, we just want to emit a RELATIVE reloc.
5267 The entry in the global offset table will already have been
5268 initialized in the relocate_section function. */
5270 && h->type == STT_GNU_IFUNC)
5272 if (h->plt.offset == (bfd_vma) -1)
5274 /* STT_GNU_IFUNC is referenced without PLT. */
5275 if (htab->elf.splt == NULL)
5277 /* use .rel[a].iplt section to store .got relocations
5278 in static executable. */
5279 relgot = htab->elf.irelplt;
5281 if (SYMBOL_REFERENCES_LOCAL (info, h))
5283 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5285 h->root.root.string,
5286 h->root.u.def.section->owner);
5288 rela.r_info = htab->r_info (0,
5289 R_X86_64_IRELATIVE);
5290 rela.r_addend = (h->root.u.def.value
5291 + h->root.u.def.section->output_section->vma
5292 + h->root.u.def.section->output_offset);
5297 else if (bfd_link_pic (info))
5299 /* Generate R_X86_64_GLOB_DAT. */
5307 if (!h->pointer_equality_needed)
5310 /* For non-shared object, we can't use .got.plt, which
5311 contains the real function addres if we need pointer
5312 equality. We load the GOT entry with the PLT entry. */
5313 if (htab->plt_second != NULL)
5315 plt = htab->plt_second;
5316 plt_offset = eh->plt_second.offset;
5320 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5321 plt_offset = h->plt.offset;
5323 bfd_put_64 (output_bfd, (plt->output_section->vma
5324 + plt->output_offset
5326 htab->elf.sgot->contents + h->got.offset);
5330 else if (bfd_link_pic (info)
5331 && SYMBOL_REFERENCES_LOCAL (info, h))
5333 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
5335 BFD_ASSERT((h->got.offset & 1) != 0);
5336 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5337 rela.r_addend = (h->root.u.def.value
5338 + h->root.u.def.section->output_section->vma
5339 + h->root.u.def.section->output_offset);
5343 BFD_ASSERT((h->got.offset & 1) == 0);
5345 bfd_put_64 (output_bfd, (bfd_vma) 0,
5346 htab->elf.sgot->contents + h->got.offset);
5347 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5351 elf_append_rela (output_bfd, relgot, &rela);
5356 Elf_Internal_Rela rela;
5359 /* This symbol needs a copy reloc. Set it up. */
5361 if (h->dynindx == -1
5362 || (h->root.type != bfd_link_hash_defined
5363 && h->root.type != bfd_link_hash_defweak)
5364 || htab->elf.srelbss == NULL
5365 || htab->elf.sreldynrelro == NULL)
5368 rela.r_offset = (h->root.u.def.value
5369 + h->root.u.def.section->output_section->vma
5370 + h->root.u.def.section->output_offset);
5371 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5373 if (h->root.u.def.section == htab->elf.sdynrelro)
5374 s = htab->elf.sreldynrelro;
5376 s = htab->elf.srelbss;
5377 elf_append_rela (output_bfd, s, &rela);
5383 /* Finish up local dynamic symbol handling. We set the contents of
5384 various dynamic sections here. */
5387 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5389 struct elf_link_hash_entry *h
5390 = (struct elf_link_hash_entry *) *slot;
5391 struct bfd_link_info *info
5392 = (struct bfd_link_info *) inf;
5394 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5398 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5399 here since undefined weak symbol may not be dynamic and may not be
5400 called for elf_x86_64_finish_dynamic_symbol. */
5403 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5406 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5407 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5409 if (h->root.type != bfd_link_hash_undefweak
5410 || h->dynindx != -1)
5413 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5417 /* Used to decide how to sort relocs in an optimal manner for the
5418 dynamic linker, before writing them out. */
5420 static enum elf_reloc_type_class
5421 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
5422 const asection *rel_sec ATTRIBUTE_UNUSED,
5423 const Elf_Internal_Rela *rela)
5425 bfd *abfd = info->output_bfd;
5426 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5427 struct elf_x86_link_hash_table *htab
5428 = elf_x86_hash_table (info, X86_64_ELF_DATA);
5430 if (htab->elf.dynsym != NULL
5431 && htab->elf.dynsym->contents != NULL)
5433 /* Check relocation against STT_GNU_IFUNC symbol if there are
5435 unsigned long r_symndx = htab->r_sym (rela->r_info);
5436 if (r_symndx != STN_UNDEF)
5438 Elf_Internal_Sym sym;
5439 if (!bed->s->swap_symbol_in (abfd,
5440 (htab->elf.dynsym->contents
5441 + r_symndx * bed->s->sizeof_sym),
5445 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5446 return reloc_class_ifunc;
5450 switch ((int) ELF32_R_TYPE (rela->r_info))
5452 case R_X86_64_IRELATIVE:
5453 return reloc_class_ifunc;
5454 case R_X86_64_RELATIVE:
5455 case R_X86_64_RELATIVE64:
5456 return reloc_class_relative;
5457 case R_X86_64_JUMP_SLOT:
5458 return reloc_class_plt;
5460 return reloc_class_copy;
5462 return reloc_class_normal;
5466 /* Finish up the dynamic sections. */
5469 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5470 struct bfd_link_info *info)
5472 struct elf_x86_link_hash_table *htab;
5476 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
5480 dynobj = htab->elf.dynobj;
5481 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5483 if (htab->elf.dynamic_sections_created)
5485 bfd_byte *dyncon, *dynconend;
5486 const struct elf_backend_data *bed;
5487 bfd_size_type sizeof_dyn;
5489 if (sdyn == NULL || htab->elf.sgot == NULL)
5492 bed = get_elf_backend_data (dynobj);
5493 sizeof_dyn = bed->s->sizeof_dyn;
5494 dyncon = sdyn->contents;
5495 dynconend = sdyn->contents + sdyn->size;
5496 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5498 Elf_Internal_Dyn dyn;
5501 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5509 s = htab->elf.sgotplt;
5510 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5514 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5518 s = htab->elf.srelplt->output_section;
5519 dyn.d_un.d_val = s->size;
5522 case DT_TLSDESC_PLT:
5524 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5525 + htab->tlsdesc_plt;
5528 case DT_TLSDESC_GOT:
5530 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5531 + htab->tlsdesc_got;
5535 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5538 if (htab->elf.splt && htab->elf.splt->size > 0)
5540 elf_section_data (htab->elf.splt->output_section)
5541 ->this_hdr.sh_entsize = htab->plt.plt_entry_size;
5543 if (htab->plt.has_plt0)
5545 /* Fill in the special first entry in the procedure linkage
5547 memcpy (htab->elf.splt->contents,
5548 htab->lazy_plt->plt0_entry,
5549 htab->lazy_plt->plt0_entry_size);
5550 /* Add offset for pushq GOT+8(%rip), since the instruction
5551 uses 6 bytes subtract this value. */
5552 bfd_put_32 (output_bfd,
5553 (htab->elf.sgotplt->output_section->vma
5554 + htab->elf.sgotplt->output_offset
5556 - htab->elf.splt->output_section->vma
5557 - htab->elf.splt->output_offset
5559 (htab->elf.splt->contents
5560 + htab->lazy_plt->plt0_got1_offset));
5561 /* Add offset for the PC-relative instruction accessing
5562 GOT+16, subtracting the offset to the end of that
5564 bfd_put_32 (output_bfd,
5565 (htab->elf.sgotplt->output_section->vma
5566 + htab->elf.sgotplt->output_offset
5568 - htab->elf.splt->output_section->vma
5569 - htab->elf.splt->output_offset
5570 - htab->lazy_plt->plt0_got2_insn_end),
5571 (htab->elf.splt->contents
5572 + htab->lazy_plt->plt0_got2_offset));
5574 if (htab->tlsdesc_plt)
5576 bfd_put_64 (output_bfd, (bfd_vma) 0,
5577 htab->elf.sgot->contents + htab->tlsdesc_got);
5579 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5580 htab->lazy_plt->plt0_entry,
5581 htab->lazy_plt->plt0_entry_size);
5583 /* Add offset for pushq GOT+8(%rip), since the
5584 instruction uses 6 bytes subtract this value. */
5585 bfd_put_32 (output_bfd,
5586 (htab->elf.sgotplt->output_section->vma
5587 + htab->elf.sgotplt->output_offset
5589 - htab->elf.splt->output_section->vma
5590 - htab->elf.splt->output_offset
5593 (htab->elf.splt->contents
5595 + htab->lazy_plt->plt0_got1_offset));
5596 /* Add offset for the PC-relative instruction accessing
5597 GOT+TDG, where TDG stands for htab->tlsdesc_got,
5598 subtracting the offset to the end of that
5600 bfd_put_32 (output_bfd,
5601 (htab->elf.sgot->output_section->vma
5602 + htab->elf.sgot->output_offset
5604 - htab->elf.splt->output_section->vma
5605 - htab->elf.splt->output_offset
5607 - htab->lazy_plt->plt0_got2_insn_end),
5608 (htab->elf.splt->contents
5610 + htab->lazy_plt->plt0_got2_offset));
5615 if (htab->plt_got != NULL && htab->plt_got->size > 0)
5616 elf_section_data (htab->plt_got->output_section)
5617 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
5619 if (htab->plt_second != NULL && htab->plt_second->size > 0)
5620 elf_section_data (htab->plt_second->output_section)
5621 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
5624 /* GOT is always created in setup_gnu_properties. But it may not be
5626 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
5628 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5631 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5635 /* Set the first entry in the global offset table to the address of
5636 the dynamic section. */
5638 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5640 bfd_put_64 (output_bfd,
5641 sdyn->output_section->vma + sdyn->output_offset,
5642 htab->elf.sgotplt->contents);
5643 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5644 bfd_put_64 (output_bfd, (bfd_vma) 0,
5645 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5646 bfd_put_64 (output_bfd, (bfd_vma) 0,
5647 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5649 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize
5653 /* Adjust .eh_frame for .plt section. */
5654 if (htab->plt_eh_frame != NULL
5655 && htab->plt_eh_frame->contents != NULL)
5657 if (htab->elf.splt != NULL
5658 && htab->elf.splt->size != 0
5659 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5660 && htab->elf.splt->output_section != NULL
5661 && htab->plt_eh_frame->output_section != NULL)
5663 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5664 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5665 + htab->plt_eh_frame->output_offset
5666 + PLT_FDE_START_OFFSET;
5667 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5668 htab->plt_eh_frame->contents
5669 + PLT_FDE_START_OFFSET);
5671 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5673 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5675 htab->plt_eh_frame->contents))
5680 /* Adjust .eh_frame for .plt.got section. */
5681 if (htab->plt_got_eh_frame != NULL
5682 && htab->plt_got_eh_frame->contents != NULL)
5684 if (htab->plt_got != NULL
5685 && htab->plt_got->size != 0
5686 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
5687 && htab->plt_got->output_section != NULL
5688 && htab->plt_got_eh_frame->output_section != NULL)
5690 bfd_vma plt_start = htab->plt_got->output_section->vma;
5691 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
5692 + htab->plt_got_eh_frame->output_offset
5693 + PLT_FDE_START_OFFSET;
5694 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5695 htab->plt_got_eh_frame->contents
5696 + PLT_FDE_START_OFFSET);
5698 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5700 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5701 htab->plt_got_eh_frame,
5702 htab->plt_got_eh_frame->contents))
5707 /* Adjust .eh_frame for the second PLT section. */
5708 if (htab->plt_second_eh_frame != NULL
5709 && htab->plt_second_eh_frame->contents != NULL)
5711 if (htab->plt_second != NULL
5712 && htab->plt_second->size != 0
5713 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
5714 && htab->plt_second->output_section != NULL
5715 && htab->plt_second_eh_frame->output_section != NULL)
5717 bfd_vma plt_start = htab->plt_second->output_section->vma;
5718 bfd_vma eh_frame_start
5719 = (htab->plt_second_eh_frame->output_section->vma
5720 + htab->plt_second_eh_frame->output_offset
5721 + PLT_FDE_START_OFFSET);
5722 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5723 htab->plt_second_eh_frame->contents
5724 + PLT_FDE_START_OFFSET);
5726 if (htab->plt_second_eh_frame->sec_info_type
5727 == SEC_INFO_TYPE_EH_FRAME)
5729 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5730 htab->plt_second_eh_frame,
5731 htab->plt_second_eh_frame->contents))
5736 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5737 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5740 /* Fill PLT entries for undefined weak symbols in PIE. */
5741 if (bfd_link_pie (info))
5742 bfd_hash_traverse (&info->hash->table,
5743 elf_x86_64_pie_finish_undefweak_symbol,
5749 /* Fill PLT/GOT entries and allocate dynamic relocations for local
5750 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
5751 It has to be done before elf_link_sort_relocs is called so that
5752 dynamic relocations are properly sorted. */
5755 elf_x86_64_output_arch_local_syms
5756 (bfd *output_bfd ATTRIBUTE_UNUSED,
5757 struct bfd_link_info *info,
5758 void *flaginfo ATTRIBUTE_UNUSED,
5759 int (*func) (void *, const char *,
5762 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
5764 struct elf_x86_link_hash_table *htab
5765 = elf_x86_hash_table (info, X86_64_ELF_DATA);
5769 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5770 htab_traverse (htab->loc_hash_table,
5771 elf_x86_64_finish_local_dynamic_symbol,
5777 /* Forward declaration. */
5778 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt;
5780 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
5781 dynamic relocations. */
5784 elf_x86_64_get_synthetic_symtab (bfd *abfd,
5785 long symcount ATTRIBUTE_UNUSED,
5786 asymbol **syms ATTRIBUTE_UNUSED,
5793 bfd_byte *plt_contents;
5795 const struct elf_x86_lazy_plt_layout *lazy_plt;
5796 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
5797 const struct elf_x86_lazy_plt_layout *lazy_bnd_plt;
5798 const struct elf_x86_non_lazy_plt_layout *non_lazy_bnd_plt;
5799 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
5800 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
5802 enum elf_x86_plt_type plt_type;
5803 struct elf_x86_plt plts[] =
5805 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
5806 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
5807 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
5808 { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 },
5809 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
5814 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
5817 if (dynsymcount <= 0)
5820 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
5824 if (get_elf_x86_64_backend_data (abfd)->os == is_normal)
5826 lazy_plt = &elf_x86_64_lazy_plt;
5827 non_lazy_plt = &elf_x86_64_non_lazy_plt;
5828 lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt;
5829 non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt;
5830 if (ABI_64_P (abfd))
5832 lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
5833 non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
5837 lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
5838 non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
5843 lazy_plt = &elf_x86_64_nacl_plt;
5844 non_lazy_plt = NULL;
5845 lazy_bnd_plt = NULL;
5846 non_lazy_bnd_plt = NULL;
5847 lazy_ibt_plt = NULL;
5848 non_lazy_ibt_plt = NULL;
5852 for (j = 0; plts[j].name != NULL; j++)
5854 plt = bfd_get_section_by_name (abfd, plts[j].name);
5855 if (plt == NULL || plt->size == 0)
5858 /* Get the PLT section contents. */
5859 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5860 if (plt_contents == NULL)
5862 if (!bfd_get_section_contents (abfd, (asection *) plt,
5863 plt_contents, 0, plt->size))
5865 free (plt_contents);
5869 /* Check what kind of PLT it is. */
5870 plt_type = plt_unknown;
5871 if (plts[j].type == plt_unknown
5872 && (plt->size >= (lazy_plt->plt_entry_size
5873 + lazy_plt->plt_entry_size)))
5875 /* Match lazy PLT first. Need to check the first two
5877 if ((memcmp (plt_contents, lazy_plt->plt0_entry,
5878 lazy_plt->plt0_got1_offset) == 0)
5879 && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6,
5881 plt_type = plt_lazy;
5882 else if (lazy_bnd_plt != NULL
5883 && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry,
5884 lazy_bnd_plt->plt0_got1_offset) == 0)
5885 && (memcmp (plt_contents + 6,
5886 lazy_bnd_plt->plt0_entry + 6, 3) == 0))
5888 plt_type = plt_lazy | plt_second;
5889 /* The fist entry in the lazy IBT PLT is the same as the
5891 if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size,
5892 lazy_ibt_plt->plt_entry,
5893 lazy_ibt_plt->plt_got_offset) == 0))
5894 lazy_plt = lazy_ibt_plt;
5896 lazy_plt = lazy_bnd_plt;
5900 if (non_lazy_plt != NULL
5901 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
5902 && plt->size >= non_lazy_plt->plt_entry_size)
5904 /* Match non-lazy PLT. */
5905 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
5906 non_lazy_plt->plt_got_offset) == 0)
5907 plt_type = plt_non_lazy;
5910 if (plt_type == plt_unknown || plt_type == plt_second)
5912 if (non_lazy_bnd_plt != NULL
5913 && plt->size >= non_lazy_bnd_plt->plt_entry_size
5914 && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry,
5915 non_lazy_bnd_plt->plt_got_offset) == 0))
5917 /* Match BND PLT. */
5918 plt_type = plt_second;
5919 non_lazy_plt = non_lazy_bnd_plt;
5921 else if (non_lazy_ibt_plt != NULL
5922 && plt->size >= non_lazy_ibt_plt->plt_entry_size
5923 && (memcmp (plt_contents,
5924 non_lazy_ibt_plt->plt_entry,
5925 non_lazy_ibt_plt->plt_got_offset) == 0))
5927 /* Match IBT PLT. */
5928 plt_type = plt_second;
5929 non_lazy_plt = non_lazy_ibt_plt;
5933 if (plt_type == plt_unknown)
5935 free (plt_contents);
5940 plts[j].type = plt_type;
5942 if ((plt_type & plt_lazy))
5944 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
5945 plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size;
5946 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
5947 /* Skip PLT0 in lazy PLT. */
5952 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
5953 plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size;
5954 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
5958 /* Skip lazy PLT when the second PLT is used. */
5959 if (plt_type == (plt_lazy | plt_second))
5963 n = plt->size / plts[j].plt_entry_size;
5968 plts[j].contents = plt_contents;
5971 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
5972 (bfd_vma) 0, plts, dynsyms,
5976 /* Handle an x86-64 specific section when reading an object file. This
5977 is called when elfcode.h finds a section with an unknown type. */
5980 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5981 const char *name, int shindex)
5983 if (hdr->sh_type != SHT_X86_64_UNWIND)
5986 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5992 /* Hook called by the linker routine which adds symbols from an object
5993 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5997 elf_x86_64_add_symbol_hook (bfd *abfd,
5998 struct bfd_link_info *info ATTRIBUTE_UNUSED,
5999 Elf_Internal_Sym *sym,
6000 const char **namep ATTRIBUTE_UNUSED,
6001 flagword *flagsp ATTRIBUTE_UNUSED,
6007 switch (sym->st_shndx)
6009 case SHN_X86_64_LCOMMON:
6010 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
6013 lcomm = bfd_make_section_with_flags (abfd,
6017 | SEC_LINKER_CREATED));
6020 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
6023 *valp = sym->st_size;
6031 /* Given a BFD section, try to locate the corresponding ELF section
6035 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
6036 asection *sec, int *index_return)
6038 if (sec == &_bfd_elf_large_com_section)
6040 *index_return = SHN_X86_64_LCOMMON;
6046 /* Process a symbol. */
6049 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
6052 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
6054 switch (elfsym->internal_elf_sym.st_shndx)
6056 case SHN_X86_64_LCOMMON:
6057 asym->section = &_bfd_elf_large_com_section;
6058 asym->value = elfsym->internal_elf_sym.st_size;
6059 /* Common symbol doesn't set BSF_GLOBAL. */
6060 asym->flags &= ~BSF_GLOBAL;
6066 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
6068 return (sym->st_shndx == SHN_COMMON
6069 || sym->st_shndx == SHN_X86_64_LCOMMON);
6073 elf_x86_64_common_section_index (asection *sec)
6075 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6078 return SHN_X86_64_LCOMMON;
6082 elf_x86_64_common_section (asection *sec)
6084 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6085 return bfd_com_section_ptr;
6087 return &_bfd_elf_large_com_section;
6091 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
6092 const Elf_Internal_Sym *sym,
6097 const asection *oldsec)
6099 /* A normal common symbol and a large common symbol result in a
6100 normal common symbol. We turn the large common symbol into a
6103 && h->root.type == bfd_link_hash_common
6105 && bfd_is_com_section (*psec)
6108 if (sym->st_shndx == SHN_COMMON
6109 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
6111 h->root.u.c.p->section
6112 = bfd_make_section_old_way (oldbfd, "COMMON");
6113 h->root.u.c.p->section->flags = SEC_ALLOC;
6115 else if (sym->st_shndx == SHN_X86_64_LCOMMON
6116 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
6117 *psec = bfd_com_section_ptr;
6124 elf_x86_64_additional_program_headers (bfd *abfd,
6125 struct bfd_link_info *info ATTRIBUTE_UNUSED)
6130 /* Check to see if we need a large readonly segment. */
6131 s = bfd_get_section_by_name (abfd, ".lrodata");
6132 if (s && (s->flags & SEC_LOAD))
6135 /* Check to see if we need a large data segment. Since .lbss sections
6136 is placed right after the .bss section, there should be no need for
6137 a large data segment just because of .lbss. */
6138 s = bfd_get_section_by_name (abfd, ".ldata");
6139 if (s && (s->flags & SEC_LOAD))
6145 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6148 elf_x86_64_relocs_compatible (const bfd_target *input,
6149 const bfd_target *output)
6151 return ((xvec_get_elf_backend_data (input)->s->elfclass
6152 == xvec_get_elf_backend_data (output)->s->elfclass)
6153 && _bfd_elf_relocs_compatible (input, output));
6156 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
6157 with GNU properties if found. Otherwise, return NULL. */
6160 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info)
6162 struct elf_x86_plt_layout_table plt_layout;
6164 plt_layout.is_vxworks = FALSE;
6165 if (get_elf_x86_64_backend_data (info->output_bfd)->os == is_normal)
6169 plt_layout.lazy_plt = &elf_x86_64_lazy_bnd_plt;
6170 plt_layout.non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt;
6174 plt_layout.lazy_plt = &elf_x86_64_lazy_plt;
6175 plt_layout.non_lazy_plt = &elf_x86_64_non_lazy_plt;
6178 if (ABI_64_P (info->output_bfd))
6180 plt_layout.lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
6181 plt_layout.non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
6185 plt_layout.lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
6186 plt_layout.non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
6188 plt_layout.normal_target = TRUE;
6192 plt_layout.lazy_plt = &elf_x86_64_nacl_plt;
6193 plt_layout.non_lazy_plt = NULL;
6194 plt_layout.lazy_ibt_plt = NULL;
6195 plt_layout.non_lazy_ibt_plt = NULL;
6196 plt_layout.normal_target = FALSE;
6199 return _bfd_x86_elf_link_setup_gnu_properties (info, &plt_layout);
6202 static const struct bfd_elf_special_section
6203 elf_x86_64_special_sections[]=
6205 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6206 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6207 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6208 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6209 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6210 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6211 { NULL, 0, 0, 0, 0 }
6214 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6215 #define TARGET_LITTLE_NAME "elf64-x86-64"
6216 #define ELF_ARCH bfd_arch_i386
6217 #define ELF_TARGET_ID X86_64_ELF_DATA
6218 #define ELF_MACHINE_CODE EM_X86_64
6219 #define ELF_MAXPAGESIZE 0x200000
6220 #define ELF_MINPAGESIZE 0x1000
6221 #define ELF_COMMONPAGESIZE 0x1000
6223 #define elf_backend_can_gc_sections 1
6224 #define elf_backend_can_refcount 1
6225 #define elf_backend_want_got_plt 1
6226 #define elf_backend_plt_readonly 1
6227 #define elf_backend_want_plt_sym 0
6228 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6229 #define elf_backend_rela_normal 1
6230 #define elf_backend_plt_alignment 4
6231 #define elf_backend_extern_protected_data 1
6232 #define elf_backend_caches_rawsize 1
6233 #define elf_backend_dtrel_excludes_plt 1
6234 #define elf_backend_want_dynrelro 1
6236 #define elf_info_to_howto elf_x86_64_info_to_howto
6238 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6239 #define bfd_elf64_bfd_reloc_name_lookup \
6240 elf_x86_64_reloc_name_lookup
6242 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6243 #define elf_backend_check_relocs elf_x86_64_check_relocs
6244 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
6245 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6246 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6247 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
6248 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6249 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6251 #define elf_backend_write_core_note elf_x86_64_write_core_note
6253 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6254 #define elf_backend_relocate_section elf_x86_64_relocate_section
6255 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6256 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6257 #define elf_backend_object_p elf64_x86_64_elf_object_p
6258 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6260 #define elf_backend_section_from_shdr \
6261 elf_x86_64_section_from_shdr
6263 #define elf_backend_section_from_bfd_section \
6264 elf_x86_64_elf_section_from_bfd_section
6265 #define elf_backend_add_symbol_hook \
6266 elf_x86_64_add_symbol_hook
6267 #define elf_backend_symbol_processing \
6268 elf_x86_64_symbol_processing
6269 #define elf_backend_common_section_index \
6270 elf_x86_64_common_section_index
6271 #define elf_backend_common_section \
6272 elf_x86_64_common_section
6273 #define elf_backend_common_definition \
6274 elf_x86_64_common_definition
6275 #define elf_backend_merge_symbol \
6276 elf_x86_64_merge_symbol
6277 #define elf_backend_special_sections \
6278 elf_x86_64_special_sections
6279 #define elf_backend_additional_program_headers \
6280 elf_x86_64_additional_program_headers
6281 #define elf_backend_setup_gnu_properties \
6282 elf_x86_64_link_setup_gnu_properties
6284 #include "elf64-target.h"
6286 /* CloudABI support. */
6288 #undef TARGET_LITTLE_SYM
6289 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6290 #undef TARGET_LITTLE_NAME
6291 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6294 #define ELF_OSABI ELFOSABI_CLOUDABI
6297 #define elf64_bed elf64_x86_64_cloudabi_bed
6299 #include "elf64-target.h"
6301 /* FreeBSD support. */
6303 #undef TARGET_LITTLE_SYM
6304 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6305 #undef TARGET_LITTLE_NAME
6306 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6309 #define ELF_OSABI ELFOSABI_FREEBSD
6312 #define elf64_bed elf64_x86_64_fbsd_bed
6314 #include "elf64-target.h"
6316 /* Solaris 2 support. */
6318 #undef TARGET_LITTLE_SYM
6319 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6320 #undef TARGET_LITTLE_NAME
6321 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6323 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6324 objects won't be recognized. */
6328 #define elf64_bed elf64_x86_64_sol2_bed
6330 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6332 #undef elf_backend_static_tls_alignment
6333 #define elf_backend_static_tls_alignment 16
6335 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6337 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6339 #undef elf_backend_want_plt_sym
6340 #define elf_backend_want_plt_sym 1
6342 #undef elf_backend_strtab_flags
6343 #define elf_backend_strtab_flags SHF_STRINGS
6346 elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6347 bfd *obfd ATTRIBUTE_UNUSED,
6348 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6349 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6351 /* PR 19938: FIXME: Need to add code for setting the sh_info
6352 and sh_link fields of Solaris specific section types. */
6356 #undef elf_backend_copy_special_section_fields
6357 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
6359 #include "elf64-target.h"
6361 /* Native Client support. */
6364 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
6366 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6367 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
6371 #undef TARGET_LITTLE_SYM
6372 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6373 #undef TARGET_LITTLE_NAME
6374 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6376 #define elf64_bed elf64_x86_64_nacl_bed
6378 #undef ELF_MAXPAGESIZE
6379 #undef ELF_MINPAGESIZE
6380 #undef ELF_COMMONPAGESIZE
6381 #define ELF_MAXPAGESIZE 0x10000
6382 #define ELF_MINPAGESIZE 0x10000
6383 #define ELF_COMMONPAGESIZE 0x10000
6385 /* Restore defaults. */
6387 #undef elf_backend_static_tls_alignment
6388 #undef elf_backend_want_plt_sym
6389 #define elf_backend_want_plt_sym 0
6390 #undef elf_backend_strtab_flags
6391 #undef elf_backend_copy_special_section_fields
6393 /* NaCl uses substantially different PLT entries for the same effects. */
6395 #undef elf_backend_plt_alignment
6396 #define elf_backend_plt_alignment 5
6397 #define NACL_PLT_ENTRY_SIZE 64
6398 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6400 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6402 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6403 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6404 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6405 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6406 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6408 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6409 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6411 /* 32 bytes of nop to pad out to the standard size. */
6412 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6413 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6414 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6415 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6416 0x66, /* excess data16 prefix */
6420 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6422 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6423 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6424 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6425 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6427 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6428 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6429 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6431 /* Lazy GOT entries point here (32-byte aligned). */
6432 0x68, /* pushq immediate */
6433 0, 0, 0, 0, /* replaced with index into relocation table. */
6434 0xe9, /* jmp relative */
6435 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6437 /* 22 bytes of nop to pad out to the standard size. */
6438 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6439 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6440 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6443 /* .eh_frame covering the .plt section. */
6445 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6447 #if (PLT_CIE_LENGTH != 20 \
6448 || PLT_FDE_LENGTH != 36 \
6449 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6450 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6451 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6453 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6454 0, 0, 0, 0, /* CIE ID */
6455 1, /* CIE version */
6456 'z', 'R', 0, /* Augmentation string */
6457 1, /* Code alignment factor */
6458 0x78, /* Data alignment factor */
6459 16, /* Return address column */
6460 1, /* Augmentation size */
6461 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6462 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6463 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6464 DW_CFA_nop, DW_CFA_nop,
6466 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6467 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6468 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6469 0, 0, 0, 0, /* .plt size goes here */
6470 0, /* Augmentation size */
6471 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6472 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6473 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6474 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6475 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6476 13, /* Block length */
6477 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6478 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6479 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6480 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6481 DW_CFA_nop, DW_CFA_nop
6484 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt =
6486 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6487 NACL_PLT_ENTRY_SIZE, /* plt0_entry_size */
6488 elf_x86_64_nacl_plt_entry, /* plt_entry */
6489 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6490 2, /* plt0_got1_offset */
6491 9, /* plt0_got2_offset */
6492 13, /* plt0_got2_insn_end */
6493 3, /* plt_got_offset */
6494 33, /* plt_reloc_offset */
6495 38, /* plt_plt_offset */
6496 7, /* plt_got_insn_size */
6497 42, /* plt_plt_insn_end */
6498 32, /* plt_lazy_offset */
6499 elf_x86_64_nacl_plt0_entry, /* pic_plt0_entry */
6500 elf_x86_64_nacl_plt_entry, /* pic_plt_entry */
6501 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6502 sizeof (elf_x86_64_nacl_eh_frame_plt) /* eh_frame_plt_size */
6505 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6510 #undef elf_backend_arch_data
6511 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6513 #undef elf_backend_object_p
6514 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6515 #undef elf_backend_modify_segment_map
6516 #define elf_backend_modify_segment_map nacl_modify_segment_map
6517 #undef elf_backend_modify_program_headers
6518 #define elf_backend_modify_program_headers nacl_modify_program_headers
6519 #undef elf_backend_final_write_processing
6520 #define elf_backend_final_write_processing nacl_final_write_processing
6522 #include "elf64-target.h"
6524 /* Native Client x32 support. */
6527 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6529 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6530 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6534 #undef TARGET_LITTLE_SYM
6535 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6536 #undef TARGET_LITTLE_NAME
6537 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6539 #define elf32_bed elf32_x86_64_nacl_bed
6541 #define bfd_elf32_bfd_reloc_type_lookup \
6542 elf_x86_64_reloc_type_lookup
6543 #define bfd_elf32_bfd_reloc_name_lookup \
6544 elf_x86_64_reloc_name_lookup
6545 #define bfd_elf32_get_synthetic_symtab \
6546 elf_x86_64_get_synthetic_symtab
6548 #undef elf_backend_object_p
6549 #define elf_backend_object_p \
6550 elf32_x86_64_nacl_elf_object_p
6552 #undef elf_backend_bfd_from_remote_memory
6553 #define elf_backend_bfd_from_remote_memory \
6554 _bfd_elf32_bfd_from_remote_memory
6556 #undef elf_backend_size_info
6557 #define elf_backend_size_info \
6558 _bfd_elf32_size_info
6560 #include "elf32-target.h"
6562 /* Restore defaults. */
6563 #undef elf_backend_object_p
6564 #define elf_backend_object_p elf64_x86_64_elf_object_p
6565 #undef elf_backend_bfd_from_remote_memory
6566 #undef elf_backend_size_info
6567 #undef elf_backend_modify_segment_map
6568 #undef elf_backend_modify_program_headers
6569 #undef elf_backend_final_write_processing
6571 /* Intel L1OM support. */
6574 elf64_l1om_elf_object_p (bfd *abfd)
6576 /* Set the right machine number for an L1OM elf64 file. */
6577 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6581 #undef TARGET_LITTLE_SYM
6582 #define TARGET_LITTLE_SYM l1om_elf64_vec
6583 #undef TARGET_LITTLE_NAME
6584 #define TARGET_LITTLE_NAME "elf64-l1om"
6586 #define ELF_ARCH bfd_arch_l1om
6588 #undef ELF_MACHINE_CODE
6589 #define ELF_MACHINE_CODE EM_L1OM
6594 #define elf64_bed elf64_l1om_bed
6596 #undef elf_backend_object_p
6597 #define elf_backend_object_p elf64_l1om_elf_object_p
6599 /* Restore defaults. */
6600 #undef ELF_MAXPAGESIZE
6601 #undef ELF_MINPAGESIZE
6602 #undef ELF_COMMONPAGESIZE
6603 #define ELF_MAXPAGESIZE 0x200000
6604 #define ELF_MINPAGESIZE 0x1000
6605 #define ELF_COMMONPAGESIZE 0x1000
6606 #undef elf_backend_plt_alignment
6607 #define elf_backend_plt_alignment 4
6608 #undef elf_backend_arch_data
6609 #define elf_backend_arch_data &elf_x86_64_arch_bed
6611 #include "elf64-target.h"
6613 /* FreeBSD L1OM support. */
6615 #undef TARGET_LITTLE_SYM
6616 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6617 #undef TARGET_LITTLE_NAME
6618 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6621 #define ELF_OSABI ELFOSABI_FREEBSD
6624 #define elf64_bed elf64_l1om_fbsd_bed
6626 #include "elf64-target.h"
6628 /* Intel K1OM support. */
6631 elf64_k1om_elf_object_p (bfd *abfd)
6633 /* Set the right machine number for an K1OM elf64 file. */
6634 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6638 #undef TARGET_LITTLE_SYM
6639 #define TARGET_LITTLE_SYM k1om_elf64_vec
6640 #undef TARGET_LITTLE_NAME
6641 #define TARGET_LITTLE_NAME "elf64-k1om"
6643 #define ELF_ARCH bfd_arch_k1om
6645 #undef ELF_MACHINE_CODE
6646 #define ELF_MACHINE_CODE EM_K1OM
6651 #define elf64_bed elf64_k1om_bed
6653 #undef elf_backend_object_p
6654 #define elf_backend_object_p elf64_k1om_elf_object_p
6656 #undef elf_backend_static_tls_alignment
6658 #undef elf_backend_want_plt_sym
6659 #define elf_backend_want_plt_sym 0
6661 #include "elf64-target.h"
6663 /* FreeBSD K1OM support. */
6665 #undef TARGET_LITTLE_SYM
6666 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6667 #undef TARGET_LITTLE_NAME
6668 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6671 #define ELF_OSABI ELFOSABI_FREEBSD
6674 #define elf64_bed elf64_k1om_fbsd_bed
6676 #include "elf64-target.h"
6678 /* 32bit x86-64 support. */
6680 #undef TARGET_LITTLE_SYM
6681 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6682 #undef TARGET_LITTLE_NAME
6683 #define TARGET_LITTLE_NAME "elf32-x86-64"
6687 #define ELF_ARCH bfd_arch_i386
6689 #undef ELF_MACHINE_CODE
6690 #define ELF_MACHINE_CODE EM_X86_64
6694 #undef elf_backend_object_p
6695 #define elf_backend_object_p \
6696 elf32_x86_64_elf_object_p
6698 #undef elf_backend_bfd_from_remote_memory
6699 #define elf_backend_bfd_from_remote_memory \
6700 _bfd_elf32_bfd_from_remote_memory
6702 #undef elf_backend_size_info
6703 #define elf_backend_size_info \
6704 _bfd_elf32_size_info
6706 #include "elf32-target.h"