1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2022 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"
24 #include "libiberty.h"
26 #include "opcode/i386.h"
33 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
34 #define MINUS_ONE (~ (bfd_vma) 0)
36 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
37 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
38 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
39 since they are the same. */
41 /* The relocation "howto" table. Order of fields:
42 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
43 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
44 static reloc_howto_type x86_64_elf_howto_table
[] =
46 HOWTO(R_X86_64_NONE
, 0, 3, 0, false, 0, complain_overflow_dont
,
47 bfd_elf_generic_reloc
, "R_X86_64_NONE", false, 0, 0x00000000,
49 HOWTO(R_X86_64_64
, 0, 4, 64, false, 0, complain_overflow_dont
,
50 bfd_elf_generic_reloc
, "R_X86_64_64", false, 0, MINUS_ONE
,
52 HOWTO(R_X86_64_PC32
, 0, 2, 32, true, 0, complain_overflow_signed
,
53 bfd_elf_generic_reloc
, "R_X86_64_PC32", false, 0, 0xffffffff,
55 HOWTO(R_X86_64_GOT32
, 0, 2, 32, false, 0, complain_overflow_signed
,
56 bfd_elf_generic_reloc
, "R_X86_64_GOT32", false, 0, 0xffffffff,
58 HOWTO(R_X86_64_PLT32
, 0, 2, 32, true, 0, complain_overflow_signed
,
59 bfd_elf_generic_reloc
, "R_X86_64_PLT32", false, 0, 0xffffffff,
61 HOWTO(R_X86_64_COPY
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_X86_64_COPY", false, 0, 0xffffffff,
64 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, false, 0, complain_overflow_dont
,
65 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", false, 0, MINUS_ONE
,
67 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, false, 0, complain_overflow_dont
,
68 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", false, 0, MINUS_ONE
,
70 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, false, 0, complain_overflow_dont
,
71 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", false, 0, MINUS_ONE
,
73 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, true, 0, complain_overflow_signed
,
74 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", false, 0, 0xffffffff,
76 HOWTO(R_X86_64_32
, 0, 2, 32, false, 0, complain_overflow_unsigned
,
77 bfd_elf_generic_reloc
, "R_X86_64_32", false, 0, 0xffffffff,
79 HOWTO(R_X86_64_32S
, 0, 2, 32, false, 0, complain_overflow_signed
,
80 bfd_elf_generic_reloc
, "R_X86_64_32S", false, 0, 0xffffffff,
82 HOWTO(R_X86_64_16
, 0, 1, 16, false, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_X86_64_16", false, 0, 0xffff, false),
84 HOWTO(R_X86_64_PC16
, 0, 1, 16, true, 0, complain_overflow_bitfield
,
85 bfd_elf_generic_reloc
, "R_X86_64_PC16", false, 0, 0xffff, true),
86 HOWTO(R_X86_64_8
, 0, 0, 8, false, 0, complain_overflow_bitfield
,
87 bfd_elf_generic_reloc
, "R_X86_64_8", false, 0, 0xff, false),
88 HOWTO(R_X86_64_PC8
, 0, 0, 8, true, 0, complain_overflow_signed
,
89 bfd_elf_generic_reloc
, "R_X86_64_PC8", false, 0, 0xff, true),
90 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, false, 0, complain_overflow_dont
,
91 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", false, 0, MINUS_ONE
,
93 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, false, 0, complain_overflow_dont
,
94 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", false, 0, MINUS_ONE
,
96 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, false, 0, complain_overflow_dont
,
97 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", false, 0, MINUS_ONE
,
99 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, true, 0, complain_overflow_signed
,
100 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", false, 0, 0xffffffff,
102 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, true, 0, complain_overflow_signed
,
103 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", false, 0, 0xffffffff,
105 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, false, 0, complain_overflow_signed
,
106 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", false, 0, 0xffffffff,
108 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, true, 0, complain_overflow_signed
,
109 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", false, 0, 0xffffffff,
111 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, false, 0, complain_overflow_signed
,
112 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", false, 0, 0xffffffff,
114 HOWTO(R_X86_64_PC64
, 0, 4, 64, true, 0, complain_overflow_dont
,
115 bfd_elf_generic_reloc
, "R_X86_64_PC64", false, 0, MINUS_ONE
,
117 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, false, 0, complain_overflow_dont
,
118 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64", false, 0, MINUS_ONE
,
120 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, true, 0, complain_overflow_signed
,
121 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32", false, 0, 0xffffffff,
123 HOWTO(R_X86_64_GOT64
, 0, 4, 64, false, 0, complain_overflow_signed
,
124 bfd_elf_generic_reloc
, "R_X86_64_GOT64", false, 0, MINUS_ONE
,
126 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, true, 0, complain_overflow_signed
,
127 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", false, 0, MINUS_ONE
,
129 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, true, 0, complain_overflow_signed
,
130 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64", false, 0, MINUS_ONE
,
132 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, false, 0, complain_overflow_signed
,
133 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", false, 0, MINUS_ONE
,
135 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, false, 0, complain_overflow_signed
,
136 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", false, 0, MINUS_ONE
,
138 HOWTO(R_X86_64_SIZE32
, 0, 2, 32, false, 0, complain_overflow_unsigned
,
139 bfd_elf_generic_reloc
, "R_X86_64_SIZE32", false, 0, 0xffffffff,
141 HOWTO(R_X86_64_SIZE64
, 0, 4, 64, false, 0, complain_overflow_dont
,
142 bfd_elf_generic_reloc
, "R_X86_64_SIZE64", false, 0, MINUS_ONE
,
144 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, true, 0,
145 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
146 "R_X86_64_GOTPC32_TLSDESC", false, 0, 0xffffffff, true),
147 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 3, 0, false, 0,
148 complain_overflow_dont
, bfd_elf_generic_reloc
,
149 "R_X86_64_TLSDESC_CALL",
151 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, false, 0,
152 complain_overflow_dont
, bfd_elf_generic_reloc
,
153 "R_X86_64_TLSDESC", false, 0, MINUS_ONE
, false),
154 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, false, 0, complain_overflow_dont
,
155 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", false, 0, MINUS_ONE
,
157 HOWTO(R_X86_64_RELATIVE64
, 0, 4, 64, false, 0, complain_overflow_dont
,
158 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE64", false, 0, MINUS_ONE
,
160 HOWTO(R_X86_64_PC32_BND
, 0, 2, 32, true, 0, complain_overflow_signed
,
161 bfd_elf_generic_reloc
, "R_X86_64_PC32_BND", false, 0, 0xffffffff,
163 HOWTO(R_X86_64_PLT32_BND
, 0, 2, 32, true, 0, complain_overflow_signed
,
164 bfd_elf_generic_reloc
, "R_X86_64_PLT32_BND", false, 0, 0xffffffff,
166 HOWTO(R_X86_64_GOTPCRELX
, 0, 2, 32, true, 0, complain_overflow_signed
,
167 bfd_elf_generic_reloc
, "R_X86_64_GOTPCRELX", false, 0, 0xffffffff,
169 HOWTO(R_X86_64_REX_GOTPCRELX
, 0, 2, 32, true, 0, complain_overflow_signed
,
170 bfd_elf_generic_reloc
, "R_X86_64_REX_GOTPCRELX", false, 0, 0xffffffff,
173 /* We have a gap in the reloc numbers here.
174 R_X86_64_standard counts the number up to this point, and
175 R_X86_64_vt_offset is the value to subtract from a reloc type of
176 R_X86_64_GNU_VT* to form an index into this table. */
177 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
178 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
180 /* GNU extension to record C++ vtable hierarchy. */
181 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, false, 0, complain_overflow_dont
,
182 NULL
, "R_X86_64_GNU_VTINHERIT", false, 0, 0, false),
184 /* GNU extension to record C++ vtable member usage. */
185 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, false, 0, complain_overflow_dont
,
186 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", false, 0, 0,
189 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
190 HOWTO(R_X86_64_32
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
191 bfd_elf_generic_reloc
, "R_X86_64_32", false, 0, 0xffffffff,
195 /* Map BFD relocs to the x86_64 elf relocs. */
198 bfd_reloc_code_real_type bfd_reloc_val
;
199 unsigned char elf_reloc_val
;
202 static const struct elf_reloc_map x86_64_reloc_map
[] =
204 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
205 { BFD_RELOC_64
, R_X86_64_64
, },
206 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
207 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
208 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
209 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
210 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
211 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
212 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
213 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
214 { BFD_RELOC_32
, R_X86_64_32
, },
215 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
216 { BFD_RELOC_16
, R_X86_64_16
, },
217 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
218 { BFD_RELOC_8
, R_X86_64_8
, },
219 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
220 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
221 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
222 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
223 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
224 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
225 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
226 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
227 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
228 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
229 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
230 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
231 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
232 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
233 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
234 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
235 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
236 { BFD_RELOC_SIZE32
, R_X86_64_SIZE32
, },
237 { BFD_RELOC_SIZE64
, R_X86_64_SIZE64
, },
238 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
239 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
240 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
241 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
242 { BFD_RELOC_X86_64_PC32_BND
, R_X86_64_PC32_BND
, },
243 { BFD_RELOC_X86_64_PLT32_BND
, R_X86_64_PLT32_BND
, },
244 { BFD_RELOC_X86_64_GOTPCRELX
, R_X86_64_GOTPCRELX
, },
245 { BFD_RELOC_X86_64_REX_GOTPCRELX
, R_X86_64_REX_GOTPCRELX
, },
246 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
247 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
250 static reloc_howto_type
*
251 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
255 if (r_type
== (unsigned int) R_X86_64_32
)
260 i
= ARRAY_SIZE (x86_64_elf_howto_table
) - 1;
262 else if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
263 || r_type
>= (unsigned int) R_X86_64_max
)
265 if (r_type
>= (unsigned int) R_X86_64_standard
)
267 /* xgettext:c-format */
268 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
270 bfd_set_error (bfd_error_bad_value
);
276 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
277 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
278 return &x86_64_elf_howto_table
[i
];
281 /* Given a BFD reloc type, return a HOWTO structure. */
282 static reloc_howto_type
*
283 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
284 bfd_reloc_code_real_type code
)
288 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
291 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
292 return elf_x86_64_rtype_to_howto (abfd
,
293 x86_64_reloc_map
[i
].elf_reloc_val
);
298 static reloc_howto_type
*
299 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
304 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
306 /* Get x32 R_X86_64_32. */
307 reloc_howto_type
*reloc
308 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
309 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
313 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
314 if (x86_64_elf_howto_table
[i
].name
!= NULL
315 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
316 return &x86_64_elf_howto_table
[i
];
321 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
324 elf_x86_64_info_to_howto (bfd
*abfd
, arelent
*cache_ptr
,
325 Elf_Internal_Rela
*dst
)
329 r_type
= ELF32_R_TYPE (dst
->r_info
);
330 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
331 if (cache_ptr
->howto
== NULL
)
333 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
|| cache_ptr
->howto
->type
== R_X86_64_NONE
);
337 /* Support for core dump NOTE sections. */
339 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
344 switch (note
->descsz
)
349 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
351 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
354 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
362 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
364 elf_tdata (abfd
)->core
->signal
365 = bfd_get_16 (abfd
, note
->descdata
+ 12);
368 elf_tdata (abfd
)->core
->lwpid
369 = bfd_get_32 (abfd
, note
->descdata
+ 32);
378 /* Make a ".reg/999" section. */
379 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
380 size
, note
->descpos
+ offset
);
384 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
386 switch (note
->descsz
)
391 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
392 elf_tdata (abfd
)->core
->pid
393 = bfd_get_32 (abfd
, note
->descdata
+ 12);
394 elf_tdata (abfd
)->core
->program
395 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
396 elf_tdata (abfd
)->core
->command
397 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
400 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
401 elf_tdata (abfd
)->core
->pid
402 = bfd_get_32 (abfd
, note
->descdata
+ 24);
403 elf_tdata (abfd
)->core
->program
404 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
405 elf_tdata (abfd
)->core
->command
406 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
409 /* Note that for some reason, a spurious space is tacked
410 onto the end of the args in some (at least one anyway)
411 implementations, so strip it off if it exists. */
414 char *command
= elf_tdata (abfd
)->core
->command
;
415 int n
= strlen (command
);
417 if (0 < n
&& command
[n
- 1] == ' ')
418 command
[n
- 1] = '\0';
425 # if GCC_VERSION >= 8000
426 # pragma GCC diagnostic push
427 # pragma GCC diagnostic ignored "-Wstringop-truncation"
430 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
433 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
435 const char *fname
, *psargs
;
446 va_start (ap
, note_type
);
447 fname
= va_arg (ap
, const char *);
448 psargs
= va_arg (ap
, const char *);
451 if (bed
->s
->elfclass
== ELFCLASS32
)
454 memset (&data
, 0, sizeof (data
));
455 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
456 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
457 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
458 &data
, sizeof (data
));
463 memset (&data
, 0, sizeof (data
));
464 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
465 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
466 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
467 &data
, sizeof (data
));
472 va_start (ap
, note_type
);
473 pid
= va_arg (ap
, long);
474 cursig
= va_arg (ap
, int);
475 gregs
= va_arg (ap
, const void *);
478 if (bed
->s
->elfclass
== ELFCLASS32
)
480 if (bed
->elf_machine_code
== EM_X86_64
)
482 prstatusx32_t prstat
;
483 memset (&prstat
, 0, sizeof (prstat
));
485 prstat
.pr_cursig
= cursig
;
486 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
487 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
488 &prstat
, sizeof (prstat
));
493 memset (&prstat
, 0, sizeof (prstat
));
495 prstat
.pr_cursig
= cursig
;
496 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
497 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
498 &prstat
, sizeof (prstat
));
504 memset (&prstat
, 0, sizeof (prstat
));
506 prstat
.pr_cursig
= cursig
;
507 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
508 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
509 &prstat
, sizeof (prstat
));
514 # if GCC_VERSION >= 8000
515 # pragma GCC diagnostic pop
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 /* The TLSDESC entry in a lazy procedure linkage table. */
647 static const bfd_byte elf_x86_64_tlsdesc_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
649 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
650 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
651 0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */
654 /* .eh_frame covering the lazy .plt section. */
656 static const bfd_byte elf_x86_64_eh_frame_lazy_plt
[] =
658 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
659 0, 0, 0, 0, /* CIE ID */
661 'z', 'R', 0, /* Augmentation string */
662 1, /* Code alignment factor */
663 0x78, /* Data alignment factor */
664 16, /* Return address column */
665 1, /* Augmentation size */
666 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
667 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
668 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
669 DW_CFA_nop
, DW_CFA_nop
,
671 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
672 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
673 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
674 0, 0, 0, 0, /* .plt size goes here */
675 0, /* Augmentation size */
676 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
677 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
678 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
679 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
680 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
681 11, /* Block length */
682 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
683 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
684 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
685 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
686 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
689 /* .eh_frame covering the lazy BND .plt section. */
691 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt
[] =
693 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
694 0, 0, 0, 0, /* CIE ID */
696 'z', 'R', 0, /* Augmentation string */
697 1, /* Code alignment factor */
698 0x78, /* Data alignment factor */
699 16, /* Return address column */
700 1, /* Augmentation size */
701 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
702 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
703 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
704 DW_CFA_nop
, DW_CFA_nop
,
706 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
707 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
708 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
709 0, 0, 0, 0, /* .plt size goes here */
710 0, /* Augmentation size */
711 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
712 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
713 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
714 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
715 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
716 11, /* Block length */
717 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
718 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
719 DW_OP_lit15
, DW_OP_and
, DW_OP_lit5
, DW_OP_ge
,
720 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
721 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
724 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
726 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt
[] =
728 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
729 0, 0, 0, 0, /* CIE ID */
731 'z', 'R', 0, /* Augmentation string */
732 1, /* Code alignment factor */
733 0x78, /* Data alignment factor */
734 16, /* Return address column */
735 1, /* Augmentation size */
736 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
737 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
738 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
739 DW_CFA_nop
, DW_CFA_nop
,
741 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
742 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
743 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
744 0, 0, 0, 0, /* .plt size goes here */
745 0, /* Augmentation size */
746 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
747 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
748 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
749 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
750 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
751 11, /* Block length */
752 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
753 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
754 DW_OP_lit15
, DW_OP_and
, DW_OP_lit10
, DW_OP_ge
,
755 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
756 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
759 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */
761 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt
[] =
763 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
764 0, 0, 0, 0, /* CIE ID */
766 'z', 'R', 0, /* Augmentation string */
767 1, /* Code alignment factor */
768 0x78, /* Data alignment factor */
769 16, /* Return address column */
770 1, /* Augmentation size */
771 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
772 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
773 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
774 DW_CFA_nop
, DW_CFA_nop
,
776 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
777 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
778 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
779 0, 0, 0, 0, /* .plt size goes here */
780 0, /* Augmentation size */
781 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
782 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
783 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
784 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
785 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
786 11, /* Block length */
787 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
788 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
789 DW_OP_lit15
, DW_OP_and
, DW_OP_lit9
, DW_OP_ge
,
790 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
791 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
794 /* .eh_frame covering the non-lazy .plt section. */
796 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt
[] =
798 #define PLT_GOT_FDE_LENGTH 20
799 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
800 0, 0, 0, 0, /* CIE ID */
802 'z', 'R', 0, /* Augmentation string */
803 1, /* Code alignment factor */
804 0x78, /* Data alignment factor */
805 16, /* Return address column */
806 1, /* Augmentation size */
807 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
808 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
809 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
810 DW_CFA_nop
, DW_CFA_nop
,
812 PLT_GOT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
813 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
814 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
815 0, 0, 0, 0, /* non-lazy .plt size goes here */
816 0, /* Augmentation size */
817 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
,
818 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
821 /* These are the standard parameters. */
822 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt
=
824 elf_x86_64_lazy_plt0_entry
, /* plt0_entry */
825 LAZY_PLT_ENTRY_SIZE
, /* plt0_entry_size */
826 elf_x86_64_lazy_plt_entry
, /* plt_entry */
827 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
828 elf_x86_64_tlsdesc_plt_entry
, /* plt_tlsdesc_entry */
829 LAZY_PLT_ENTRY_SIZE
, /* plt_tlsdesc_entry_size */
830 6, /* plt_tlsdesc_got1_offset */
831 12, /* plt_tlsdesc_got2_offset */
832 10, /* plt_tlsdesc_got1_insn_end */
833 16, /* plt_tlsdesc_got2_insn_end */
834 2, /* plt0_got1_offset */
835 8, /* plt0_got2_offset */
836 12, /* plt0_got2_insn_end */
837 2, /* plt_got_offset */
838 7, /* plt_reloc_offset */
839 12, /* plt_plt_offset */
840 6, /* plt_got_insn_size */
841 LAZY_PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
842 6, /* plt_lazy_offset */
843 elf_x86_64_lazy_plt0_entry
, /* pic_plt0_entry */
844 elf_x86_64_lazy_plt_entry
, /* pic_plt_entry */
845 elf_x86_64_eh_frame_lazy_plt
, /* eh_frame_plt */
846 sizeof (elf_x86_64_eh_frame_lazy_plt
) /* eh_frame_plt_size */
849 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt
=
851 elf_x86_64_non_lazy_plt_entry
, /* plt_entry */
852 elf_x86_64_non_lazy_plt_entry
, /* pic_plt_entry */
853 NON_LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
854 2, /* plt_got_offset */
855 6, /* plt_got_insn_size */
856 elf_x86_64_eh_frame_non_lazy_plt
, /* eh_frame_plt */
857 sizeof (elf_x86_64_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
860 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt
=
862 elf_x86_64_lazy_bnd_plt0_entry
, /* plt0_entry */
863 LAZY_PLT_ENTRY_SIZE
, /* plt0_entry_size */
864 elf_x86_64_lazy_bnd_plt_entry
, /* plt_entry */
865 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
866 elf_x86_64_tlsdesc_plt_entry
, /* plt_tlsdesc_entry */
867 LAZY_PLT_ENTRY_SIZE
, /* plt_tlsdesc_entry_size */
868 6, /* plt_tlsdesc_got1_offset */
869 12, /* plt_tlsdesc_got2_offset */
870 10, /* plt_tlsdesc_got1_insn_end */
871 16, /* plt_tlsdesc_got2_insn_end */
872 2, /* plt0_got1_offset */
873 1+8, /* plt0_got2_offset */
874 1+12, /* plt0_got2_insn_end */
875 1+2, /* plt_got_offset */
876 1, /* plt_reloc_offset */
877 7, /* plt_plt_offset */
878 1+6, /* plt_got_insn_size */
879 11, /* plt_plt_insn_end */
880 0, /* plt_lazy_offset */
881 elf_x86_64_lazy_bnd_plt0_entry
, /* pic_plt0_entry */
882 elf_x86_64_lazy_bnd_plt_entry
, /* pic_plt_entry */
883 elf_x86_64_eh_frame_lazy_bnd_plt
, /* eh_frame_plt */
884 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt
) /* eh_frame_plt_size */
887 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt
=
889 elf_x86_64_non_lazy_bnd_plt_entry
, /* plt_entry */
890 elf_x86_64_non_lazy_bnd_plt_entry
, /* pic_plt_entry */
891 NON_LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
892 1+2, /* plt_got_offset */
893 1+6, /* plt_got_insn_size */
894 elf_x86_64_eh_frame_non_lazy_plt
, /* eh_frame_plt */
895 sizeof (elf_x86_64_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
898 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt
=
900 elf_x86_64_lazy_bnd_plt0_entry
, /* plt0_entry */
901 LAZY_PLT_ENTRY_SIZE
, /* plt0_entry_size */
902 elf_x86_64_lazy_ibt_plt_entry
, /* plt_entry */
903 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
904 elf_x86_64_tlsdesc_plt_entry
, /* plt_tlsdesc_entry */
905 LAZY_PLT_ENTRY_SIZE
, /* plt_tlsdesc_entry_size */
906 6, /* plt_tlsdesc_got1_offset */
907 12, /* plt_tlsdesc_got2_offset */
908 10, /* plt_tlsdesc_got1_insn_end */
909 16, /* plt_tlsdesc_got2_insn_end */
910 2, /* plt0_got1_offset */
911 1+8, /* plt0_got2_offset */
912 1+12, /* plt0_got2_insn_end */
913 4+1+2, /* plt_got_offset */
914 4+1, /* plt_reloc_offset */
915 4+1+6, /* plt_plt_offset */
916 4+1+6, /* plt_got_insn_size */
917 4+1+5+5, /* plt_plt_insn_end */
918 0, /* plt_lazy_offset */
919 elf_x86_64_lazy_bnd_plt0_entry
, /* pic_plt0_entry */
920 elf_x86_64_lazy_ibt_plt_entry
, /* pic_plt_entry */
921 elf_x86_64_eh_frame_lazy_ibt_plt
, /* eh_frame_plt */
922 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt
) /* eh_frame_plt_size */
925 static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt
=
927 elf_x86_64_lazy_plt0_entry
, /* plt0_entry */
928 LAZY_PLT_ENTRY_SIZE
, /* plt0_entry_size */
929 elf_x32_lazy_ibt_plt_entry
, /* plt_entry */
930 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
931 elf_x86_64_tlsdesc_plt_entry
, /* plt_tlsdesc_entry */
932 LAZY_PLT_ENTRY_SIZE
, /* plt_tlsdesc_entry_size */
933 6, /* plt_tlsdesc_got1_offset */
934 12, /* plt_tlsdesc_got2_offset */
935 10, /* plt_tlsdesc_got1_insn_end */
936 16, /* plt_tlsdesc_got2_insn_end */
937 2, /* plt0_got1_offset */
938 8, /* plt0_got2_offset */
939 12, /* plt0_got2_insn_end */
940 4+2, /* plt_got_offset */
941 4+1, /* plt_reloc_offset */
942 4+6, /* plt_plt_offset */
943 4+6, /* plt_got_insn_size */
944 4+5+5, /* plt_plt_insn_end */
945 0, /* plt_lazy_offset */
946 elf_x86_64_lazy_plt0_entry
, /* pic_plt0_entry */
947 elf_x32_lazy_ibt_plt_entry
, /* pic_plt_entry */
948 elf_x32_eh_frame_lazy_ibt_plt
, /* eh_frame_plt */
949 sizeof (elf_x32_eh_frame_lazy_ibt_plt
) /* eh_frame_plt_size */
952 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt
=
954 elf_x86_64_non_lazy_ibt_plt_entry
, /* plt_entry */
955 elf_x86_64_non_lazy_ibt_plt_entry
, /* pic_plt_entry */
956 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
957 4+1+2, /* plt_got_offset */
958 4+1+6, /* plt_got_insn_size */
959 elf_x86_64_eh_frame_non_lazy_plt
, /* eh_frame_plt */
960 sizeof (elf_x86_64_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
963 static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt
=
965 elf_x32_non_lazy_ibt_plt_entry
, /* plt_entry */
966 elf_x32_non_lazy_ibt_plt_entry
, /* pic_plt_entry */
967 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
968 4+2, /* plt_got_offset */
969 4+6, /* plt_got_insn_size */
970 elf_x86_64_eh_frame_non_lazy_plt
, /* eh_frame_plt */
971 sizeof (elf_x86_64_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
976 elf64_x86_64_elf_object_p (bfd
*abfd
)
978 /* Set the right machine number for an x86-64 elf64 file. */
979 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
984 elf32_x86_64_elf_object_p (bfd
*abfd
)
986 /* Set the right machine number for an x86-64 elf32 file. */
987 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
991 /* Return TRUE if the TLS access code sequence support transition
995 elf_x86_64_check_tls_transition (bfd
*abfd
,
996 struct bfd_link_info
*info
,
999 Elf_Internal_Shdr
*symtab_hdr
,
1000 struct elf_link_hash_entry
**sym_hashes
,
1001 unsigned int r_type
,
1002 const Elf_Internal_Rela
*rel
,
1003 const Elf_Internal_Rela
*relend
)
1006 unsigned long r_symndx
;
1007 bool largepic
= false;
1008 struct elf_link_hash_entry
*h
;
1010 struct elf_x86_link_hash_table
*htab
;
1014 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
1015 offset
= rel
->r_offset
;
1018 case R_X86_64_TLSGD
:
1019 case R_X86_64_TLSLD
:
1020 if ((rel
+ 1) >= relend
)
1023 if (r_type
== R_X86_64_TLSGD
)
1025 /* Check transition from GD access model. For 64bit, only
1026 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1027 .word 0x6666; rex64; call __tls_get_addr@PLT
1029 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1031 call *__tls_get_addr@GOTPCREL(%rip)
1032 which may be converted to
1033 addr32 call __tls_get_addr
1034 can transit to different access model. For 32bit, only
1035 leaq foo@tlsgd(%rip), %rdi
1036 .word 0x6666; rex64; call __tls_get_addr@PLT
1038 leaq foo@tlsgd(%rip), %rdi
1040 call *__tls_get_addr@GOTPCREL(%rip)
1041 which may be converted to
1042 addr32 call __tls_get_addr
1043 can transit to different access model. For largepic,
1045 leaq foo@tlsgd(%rip), %rdi
1046 movabsq $__tls_get_addr@pltoff, %rax
1050 leaq foo@tlsgd(%rip), %rdi
1051 movabsq $__tls_get_addr@pltoff, %rax
1055 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1057 if ((offset
+ 12) > sec
->size
)
1060 call
= contents
+ offset
+ 4;
1062 || !((call
[1] == 0x48
1070 && call
[3] == 0xe8)))
1072 if (!ABI_64_P (abfd
)
1073 || (offset
+ 19) > sec
->size
1075 || memcmp (call
- 7, leaq
+ 1, 3) != 0
1076 || memcmp (call
, "\x48\xb8", 2) != 0
1080 || !((call
[10] == 0x48 && call
[12] == 0xd8)
1081 || (call
[10] == 0x4c && call
[12] == 0xf8)))
1085 else if (ABI_64_P (abfd
))
1088 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1094 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1097 indirect_call
= call
[2] == 0xff;
1101 /* Check transition from LD access model. Only
1102 leaq foo@tlsld(%rip), %rdi;
1103 call __tls_get_addr@PLT
1105 leaq foo@tlsld(%rip), %rdi;
1106 call *__tls_get_addr@GOTPCREL(%rip)
1107 which may be converted to
1108 addr32 call __tls_get_addr
1109 can transit to different access model. For largepic
1111 leaq foo@tlsld(%rip), %rdi
1112 movabsq $__tls_get_addr@pltoff, %rax
1116 leaq foo@tlsld(%rip), %rdi
1117 movabsq $__tls_get_addr@pltoff, %rax
1121 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1123 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1126 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1129 call
= contents
+ offset
+ 4;
1130 if (!(call
[0] == 0xe8
1131 || (call
[0] == 0xff && call
[1] == 0x15)
1132 || (call
[0] == 0x67 && call
[1] == 0xe8)))
1134 if (!ABI_64_P (abfd
)
1135 || (offset
+ 19) > sec
->size
1136 || memcmp (call
, "\x48\xb8", 2) != 0
1140 || !((call
[10] == 0x48 && call
[12] == 0xd8)
1141 || (call
[10] == 0x4c && call
[12] == 0xf8)))
1145 indirect_call
= call
[0] == 0xff;
1148 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1149 if (r_symndx
< symtab_hdr
->sh_info
)
1152 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1154 || !((struct elf_x86_link_hash_entry
*) h
)->tls_get_addr
)
1158 r_type
= (ELF32_R_TYPE (rel
[1].r_info
)
1159 & ~R_X86_64_converted_reloc_bit
);
1161 return r_type
== R_X86_64_PLTOFF64
;
1162 else if (indirect_call
)
1163 return r_type
== R_X86_64_GOTPCRELX
;
1165 return (r_type
== R_X86_64_PC32
|| r_type
== R_X86_64_PLT32
);
1168 case R_X86_64_GOTTPOFF
:
1169 /* Check transition from IE access model:
1170 mov foo@gottpoff(%rip), %reg
1171 add foo@gottpoff(%rip), %reg
1174 /* Check REX prefix first. */
1175 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1177 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1178 if (val
!= 0x48 && val
!= 0x4c)
1180 /* X32 may have 0x44 REX prefix or no REX prefix. */
1181 if (ABI_64_P (abfd
))
1187 /* X32 may not have any REX prefix. */
1188 if (ABI_64_P (abfd
))
1190 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1194 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1195 if (val
!= 0x8b && val
!= 0x03)
1198 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1199 return (val
& 0xc7) == 5;
1201 case R_X86_64_GOTPC32_TLSDESC
:
1202 /* Check transition from GDesc access model:
1203 leaq x@tlsdesc(%rip), %rax <--- LP64 mode.
1204 rex leal x@tlsdesc(%rip), %eax <--- X32 mode.
1206 Make sure it's a leaq adding rip to a 32-bit offset
1207 into any register, although it's probably almost always
1210 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1213 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1215 if (val
!= 0x48 && (ABI_64_P (abfd
) || val
!= 0x40))
1218 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1221 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1222 return (val
& 0xc7) == 0x05;
1224 case R_X86_64_TLSDESC_CALL
:
1225 /* Check transition from GDesc access model:
1226 call *x@tlsdesc(%rax) <--- LP64 mode.
1227 call *x@tlsdesc(%eax) <--- X32 mode.
1229 if (offset
+ 2 <= sec
->size
)
1231 unsigned int prefix
;
1232 call
= contents
+ offset
;
1234 if (!ABI_64_P (abfd
))
1236 /* Check for call *x@tlsdesc(%eax). */
1237 if (call
[0] == 0x67)
1240 if (offset
+ 3 > sec
->size
)
1244 /* Make sure that it's a call *x@tlsdesc(%rax). */
1245 return call
[prefix
] == 0xff && call
[1 + prefix
] == 0x10;
1255 /* Return TRUE if the TLS access transition is OK or no transition
1256 will be performed. Update R_TYPE if there is a transition. */
1259 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1260 asection
*sec
, bfd_byte
*contents
,
1261 Elf_Internal_Shdr
*symtab_hdr
,
1262 struct elf_link_hash_entry
**sym_hashes
,
1263 unsigned int *r_type
, int tls_type
,
1264 const Elf_Internal_Rela
*rel
,
1265 const Elf_Internal_Rela
*relend
,
1266 struct elf_link_hash_entry
*h
,
1267 unsigned long r_symndx
,
1268 bool from_relocate_section
)
1270 unsigned int from_type
= *r_type
;
1271 unsigned int to_type
= from_type
;
1274 /* Skip TLS transition for functions. */
1276 && (h
->type
== STT_FUNC
1277 || h
->type
== STT_GNU_IFUNC
))
1282 case R_X86_64_TLSGD
:
1283 case R_X86_64_GOTPC32_TLSDESC
:
1284 case R_X86_64_TLSDESC_CALL
:
1285 case R_X86_64_GOTTPOFF
:
1286 if (bfd_link_executable (info
))
1289 to_type
= R_X86_64_TPOFF32
;
1291 to_type
= R_X86_64_GOTTPOFF
;
1294 /* When we are called from elf_x86_64_relocate_section, there may
1295 be additional transitions based on TLS_TYPE. */
1296 if (from_relocate_section
)
1298 unsigned int new_to_type
= to_type
;
1300 if (TLS_TRANSITION_IE_TO_LE_P (info
, h
, tls_type
))
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_scan_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
);
1345 if (from
== NULL
|| to
== NULL
)
1349 name
= h
->root
.root
.string
;
1352 struct elf_x86_link_hash_table
*htab
;
1354 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
1359 Elf_Internal_Sym
*isym
;
1361 isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
1363 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1368 /* xgettext:c-format */
1369 (_("%pB: TLS transition from %s to %s against `%s' at %#" PRIx64
1370 " in section `%pA' failed"),
1371 abfd
, from
->name
, to
->name
, name
, (uint64_t) rel
->r_offset
, sec
);
1372 bfd_set_error (bfd_error_bad_value
);
1381 elf_x86_64_need_pic (struct bfd_link_info
*info
,
1382 bfd
*input_bfd
, asection
*sec
,
1383 struct elf_link_hash_entry
*h
,
1384 Elf_Internal_Shdr
*symtab_hdr
,
1385 Elf_Internal_Sym
*isym
,
1386 reloc_howto_type
*howto
)
1389 const char *und
= "";
1390 const char *pic
= "";
1396 name
= h
->root
.root
.string
;
1397 switch (ELF_ST_VISIBILITY (h
->other
))
1400 v
= _("hidden symbol ");
1403 v
= _("internal symbol ");
1406 v
= _("protected symbol ");
1409 if (((struct elf_x86_link_hash_entry
*) h
)->def_protected
)
1410 v
= _("protected symbol ");
1417 if (!SYMBOL_DEFINED_NON_SHARED_P (h
) && !h
->def_dynamic
)
1418 und
= _("undefined ");
1422 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, isym
, NULL
);
1426 if (bfd_link_dll (info
))
1428 object
= _("a shared object");
1430 pic
= _("; recompile with -fPIC");
1434 if (bfd_link_pie (info
))
1435 object
= _("a PIE object");
1437 object
= _("a PDE object");
1439 pic
= _("; recompile with -fPIE");
1442 /* xgettext:c-format */
1443 _bfd_error_handler (_("%pB: relocation %s against %s%s`%s' can "
1444 "not be used when making %s%s"),
1445 input_bfd
, howto
->name
, und
, v
, name
,
1447 bfd_set_error (bfd_error_bad_value
);
1448 sec
->check_relocs_failed
= 1;
1452 /* With the local symbol, foo, we convert
1453 mov foo@GOTPCREL(%rip), %reg
1457 call/jmp *foo@GOTPCREL(%rip)
1459 nop call foo/jmp foo nop
1460 When PIC is false, convert
1461 test %reg, foo@GOTPCREL(%rip)
1465 binop foo@GOTPCREL(%rip), %reg
1468 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1472 elf_x86_64_convert_load_reloc (bfd
*abfd
,
1474 unsigned int *r_type_p
,
1475 Elf_Internal_Rela
*irel
,
1476 struct elf_link_hash_entry
*h
,
1478 struct bfd_link_info
*link_info
)
1480 struct elf_x86_link_hash_table
*htab
;
1488 bfd_signed_vma raddend
;
1489 unsigned int opcode
;
1491 unsigned int r_type
= *r_type_p
;
1492 unsigned int r_symndx
;
1493 bfd_vma roff
= irel
->r_offset
;
1494 bfd_vma abs_relocation
;
1496 if (roff
< (r_type
== R_X86_64_REX_GOTPCRELX
? 3 : 2))
1499 raddend
= irel
->r_addend
;
1500 /* Addend for 32-bit PC-relative relocation must be -4. */
1504 htab
= elf_x86_hash_table (link_info
, X86_64_ELF_DATA
);
1505 is_pic
= bfd_link_pic (link_info
);
1507 relocx
= (r_type
== R_X86_64_GOTPCRELX
1508 || r_type
== R_X86_64_REX_GOTPCRELX
);
1510 /* TRUE if --no-relax is used. */
1511 no_overflow
= link_info
->disable_target_specific_optimizations
> 1;
1513 r_symndx
= htab
->r_sym (irel
->r_info
);
1515 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
1517 /* Convert mov to lea since it has been done for a while. */
1520 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1521 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1522 test, xor instructions. */
1527 /* We convert only to R_X86_64_PC32:
1529 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1530 3. no_overflow is true.
1533 to_reloc_pc32
= (opcode
== 0xff
1541 /* Get the symbol referred to by the reloc. */
1544 Elf_Internal_Sym
*isym
1545 = bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
, abfd
, r_symndx
);
1547 /* Skip relocation against undefined symbols. */
1548 if (isym
->st_shndx
== SHN_UNDEF
)
1552 if (isym
->st_shndx
== SHN_ABS
)
1554 tsec
= bfd_abs_section_ptr
;
1556 abs_relocation
= isym
->st_value
;
1558 else if (isym
->st_shndx
== SHN_COMMON
)
1559 tsec
= bfd_com_section_ptr
;
1560 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
1561 tsec
= &_bfd_elf_large_com_section
;
1563 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1567 /* Undefined weak symbol is only bound locally in executable
1568 and its reference is resolved as 0 without relocation
1569 overflow. We can only perform this optimization for
1570 GOTPCRELX relocations since we need to modify REX byte.
1571 It is OK convert mov with R_X86_64_GOTPCREL to
1573 struct elf_x86_link_hash_entry
*eh
= elf_x86_hash_entry (h
);
1575 abs_symbol
= ABS_SYMBOL_P (h
);
1576 abs_relocation
= h
->root
.u
.def
.value
;
1578 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1579 local_ref
= SYMBOL_REFERENCES_LOCAL_P (link_info
, h
);
1580 if ((relocx
|| opcode
== 0x8b)
1581 && (h
->root
.type
== bfd_link_hash_undefweak
1587 /* Skip for branch instructions since R_X86_64_PC32
1594 /* For non-branch instructions, we can convert to
1595 R_X86_64_32/R_X86_64_32S since we know if there
1597 to_reloc_pc32
= false;
1600 /* Since we don't know the current PC when PIC is true,
1601 we can't convert to R_X86_64_PC32. */
1602 if (to_reloc_pc32
&& is_pic
)
1607 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1608 ld.so may use its link-time address. */
1609 else if (h
->start_stop
1612 || h
->root
.type
== bfd_link_hash_defined
1613 || h
->root
.type
== bfd_link_hash_defweak
)
1614 && h
!= htab
->elf
.hdynamic
1617 /* bfd_link_hash_new or bfd_link_hash_undefined is
1618 set by an assignment in a linker script in
1619 bfd_elf_record_link_assignment. start_stop is set
1620 on __start_SECNAME/__stop_SECNAME which mark section
1625 && (h
->root
.type
== bfd_link_hash_new
1626 || h
->root
.type
== bfd_link_hash_undefined
1627 || ((h
->root
.type
== bfd_link_hash_defined
1628 || h
->root
.type
== bfd_link_hash_defweak
)
1629 && h
->root
.u
.def
.section
== bfd_und_section_ptr
))))
1631 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1636 tsec
= h
->root
.u
.def
.section
;
1642 /* Don't convert GOTPCREL relocation against large section. */
1643 if (elf_section_data (tsec
) != NULL
1644 && (elf_section_flags (tsec
) & SHF_X86_64_LARGE
) != 0)
1647 /* Skip since R_X86_64_PC32/R_X86_64_32/R_X86_64_32S may overflow. */
1654 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
1659 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
1661 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
1664 /* Convert to "jmp foo nop". */
1667 nop_offset
= irel
->r_offset
+ 3;
1668 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
1669 irel
->r_offset
-= 1;
1670 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
1674 struct elf_x86_link_hash_entry
*eh
1675 = (struct elf_x86_link_hash_entry
*) h
;
1677 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1680 /* To support TLS optimization, always use addr32 prefix for
1681 "call *__tls_get_addr@GOTPCREL(%rip)". */
1682 if (eh
&& eh
->tls_get_addr
)
1685 nop_offset
= irel
->r_offset
- 2;
1689 nop
= htab
->params
->call_nop_byte
;
1690 if (htab
->params
->call_nop_as_suffix
)
1692 nop_offset
= irel
->r_offset
+ 3;
1693 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
1694 irel
->r_offset
-= 1;
1695 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
1698 nop_offset
= irel
->r_offset
- 2;
1701 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
1702 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
1703 r_type
= R_X86_64_PC32
;
1708 unsigned int rex_mask
= REX_R
;
1710 if (r_type
== R_X86_64_REX_GOTPCRELX
)
1711 rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
1717 if (abs_symbol
&& local_ref
&& relocx
)
1718 to_reloc_pc32
= false;
1722 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1723 "lea foo(%rip), %reg". */
1725 r_type
= R_X86_64_PC32
;
1729 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1730 "mov $foo, %reg". */
1732 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
1733 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
1734 if ((rex
& REX_W
) != 0
1735 && ABI_64_P (link_info
->output_bfd
))
1737 /* Keep the REX_W bit in REX byte for LP64. */
1738 r_type
= R_X86_64_32S
;
1739 goto rewrite_modrm_rex
;
1743 /* If the REX_W bit in REX byte isn't needed,
1744 use R_X86_64_32 and clear the W bit to avoid
1745 sign-extend imm32 to imm64. */
1746 r_type
= R_X86_64_32
;
1747 /* Clear the W bit in REX byte. */
1749 goto rewrite_modrm_rex
;
1755 /* R_X86_64_PC32 isn't supported. */
1759 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
1762 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
1763 "test $foo, %reg". */
1764 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
1769 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
1770 "binop $foo, %reg". */
1771 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
1775 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
1776 overflow when sign-extending imm32 to imm64. */
1777 r_type
= (rex
& REX_W
) != 0 ? R_X86_64_32S
: R_X86_64_32
;
1782 /* Check if R_X86_64_32S/R_X86_64_32 fits. */
1783 if (r_type
== R_X86_64_32S
)
1785 if ((abs_relocation
+ 0x80000000) > 0xffffffff)
1790 if (abs_relocation
> 0xffffffff)
1795 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
1799 /* Move the R bit to the B bit in REX byte. */
1800 rex
= (rex
& ~rex_mask
) | (rex
& REX_R
) >> 2;
1801 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
1804 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
1808 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
1812 irel
->r_info
= htab
->r_info (r_symndx
,
1813 r_type
| R_X86_64_converted_reloc_bit
);
1820 /* Look through the relocs for a section during the first phase, and
1821 calculate needed space in the global offset table, and procedure
1825 elf_x86_64_scan_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1827 const Elf_Internal_Rela
*relocs
)
1829 struct elf_x86_link_hash_table
*htab
;
1830 Elf_Internal_Shdr
*symtab_hdr
;
1831 struct elf_link_hash_entry
**sym_hashes
;
1832 const Elf_Internal_Rela
*rel
;
1833 const Elf_Internal_Rela
*rel_end
;
1837 if (bfd_link_relocatable (info
))
1840 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
1843 sec
->check_relocs_failed
= 1;
1847 BFD_ASSERT (is_x86_elf (abfd
, htab
));
1849 /* Get the section contents. */
1850 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1851 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1852 else if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1854 sec
->check_relocs_failed
= 1;
1858 symtab_hdr
= &elf_symtab_hdr (abfd
);
1859 sym_hashes
= elf_sym_hashes (abfd
);
1863 rel_end
= relocs
+ sec
->reloc_count
;
1864 for (rel
= relocs
; rel
< rel_end
; rel
++)
1866 unsigned int r_type
;
1867 unsigned int r_symndx
;
1868 struct elf_link_hash_entry
*h
;
1869 struct elf_x86_link_hash_entry
*eh
;
1870 Elf_Internal_Sym
*isym
;
1873 bool converted_reloc
;
1876 r_symndx
= htab
->r_sym (rel
->r_info
);
1877 r_type
= ELF32_R_TYPE (rel
->r_info
);
1879 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1881 /* xgettext:c-format */
1882 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1887 if (r_symndx
< symtab_hdr
->sh_info
)
1889 /* A local symbol. */
1890 isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
1895 /* Check relocation against local STT_GNU_IFUNC symbol. */
1896 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1898 h
= _bfd_elf_x86_get_local_sym_hash (htab
, abfd
, rel
,
1903 /* Fake a STT_GNU_IFUNC symbol. */
1904 h
->root
.root
.string
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1906 h
->type
= STT_GNU_IFUNC
;
1909 h
->forced_local
= 1;
1910 h
->root
.type
= bfd_link_hash_defined
;
1918 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1919 while (h
->root
.type
== bfd_link_hash_indirect
1920 || h
->root
.type
== bfd_link_hash_warning
)
1921 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1924 /* Check invalid x32 relocations. */
1925 if (!ABI_64_P (abfd
))
1931 case R_X86_64_DTPOFF64
:
1932 case R_X86_64_TPOFF64
:
1934 case R_X86_64_GOTOFF64
:
1935 case R_X86_64_GOT64
:
1936 case R_X86_64_GOTPCREL64
:
1937 case R_X86_64_GOTPC64
:
1938 case R_X86_64_GOTPLT64
:
1939 case R_X86_64_PLTOFF64
:
1942 name
= h
->root
.root
.string
;
1944 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1947 /* xgettext:c-format */
1948 (_("%pB: relocation %s against symbol `%s' isn't "
1949 "supported in x32 mode"), abfd
,
1950 x86_64_elf_howto_table
[r_type
].name
, name
);
1951 bfd_set_error (bfd_error_bad_value
);
1957 eh
= (struct elf_x86_link_hash_entry
*) h
;
1961 /* It is referenced by a non-shared object. */
1965 converted_reloc
= false;
1966 if ((r_type
== R_X86_64_GOTPCREL
1967 || r_type
== R_X86_64_GOTPCRELX
1968 || r_type
== R_X86_64_REX_GOTPCRELX
)
1969 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
1971 Elf_Internal_Rela
*irel
= (Elf_Internal_Rela
*) rel
;
1972 if (!elf_x86_64_convert_load_reloc (abfd
, contents
, &r_type
,
1973 irel
, h
, &converted_reloc
,
1977 if (converted_reloc
)
1981 if (!_bfd_elf_x86_valid_reloc_p (sec
, info
, htab
, rel
, h
, isym
,
1982 symtab_hdr
, &no_dynreloc
))
1985 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, contents
,
1986 symtab_hdr
, sym_hashes
,
1987 &r_type
, GOT_UNKNOWN
,
1988 rel
, rel_end
, h
, r_symndx
, false))
1991 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1992 if (h
== htab
->elf
.hgot
)
1993 htab
->got_referenced
= true;
1997 case R_X86_64_TLSLD
:
1998 htab
->tls_ld_or_ldm_got
.refcount
= 1;
2001 case R_X86_64_TPOFF32
:
2002 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
2003 return elf_x86_64_need_pic (info
, abfd
, sec
, h
, symtab_hdr
, isym
,
2004 &x86_64_elf_howto_table
[r_type
]);
2006 eh
->zero_undefweak
&= 0x2;
2009 case R_X86_64_GOTTPOFF
:
2010 if (!bfd_link_executable (info
))
2011 info
->flags
|= DF_STATIC_TLS
;
2014 case R_X86_64_GOT32
:
2015 case R_X86_64_GOTPCREL
:
2016 case R_X86_64_GOTPCRELX
:
2017 case R_X86_64_REX_GOTPCRELX
:
2018 case R_X86_64_TLSGD
:
2019 case R_X86_64_GOT64
:
2020 case R_X86_64_GOTPCREL64
:
2021 case R_X86_64_GOTPLT64
:
2022 case R_X86_64_GOTPC32_TLSDESC
:
2023 case R_X86_64_TLSDESC_CALL
:
2024 /* This symbol requires a global offset table entry. */
2026 int tls_type
, old_tls_type
;
2031 tls_type
= GOT_NORMAL
;
2034 if (ABS_SYMBOL_P (h
))
2037 else if (isym
->st_shndx
== SHN_ABS
)
2040 case R_X86_64_TLSGD
:
2041 tls_type
= GOT_TLS_GD
;
2043 case R_X86_64_GOTTPOFF
:
2044 tls_type
= GOT_TLS_IE
;
2046 case R_X86_64_GOTPC32_TLSDESC
:
2047 case R_X86_64_TLSDESC_CALL
:
2048 tls_type
= GOT_TLS_GDESC
;
2054 h
->got
.refcount
= 1;
2055 old_tls_type
= eh
->tls_type
;
2059 bfd_signed_vma
*local_got_refcounts
;
2061 if (!elf_x86_allocate_local_got_info (abfd
,
2062 symtab_hdr
->sh_info
))
2065 /* This is a global offset table entry for a local symbol. */
2066 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2067 local_got_refcounts
[r_symndx
] = 1;
2069 = elf_x86_local_got_tls_type (abfd
) [r_symndx
];
2072 /* If a TLS symbol is accessed using IE at least once,
2073 there is no point to use dynamic model for it. */
2074 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
2075 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
2076 || tls_type
!= GOT_TLS_IE
))
2078 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
2079 tls_type
= old_tls_type
;
2080 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
2081 && GOT_TLS_GD_ANY_P (tls_type
))
2082 tls_type
|= old_tls_type
;
2086 name
= h
->root
.root
.string
;
2088 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
2091 /* xgettext:c-format */
2092 (_("%pB: '%s' accessed both as normal and"
2093 " thread local symbol"),
2095 bfd_set_error (bfd_error_bad_value
);
2100 if (old_tls_type
!= tls_type
)
2103 eh
->tls_type
= tls_type
;
2105 elf_x86_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
2110 case R_X86_64_GOTOFF64
:
2111 case R_X86_64_GOTPC32
:
2112 case R_X86_64_GOTPC64
:
2115 eh
->zero_undefweak
&= 0x2;
2118 case R_X86_64_PLT32
:
2119 case R_X86_64_PLT32_BND
:
2120 /* This symbol requires a procedure linkage table entry. We
2121 actually build the entry in adjust_dynamic_symbol,
2122 because this might be a case of linking PIC code which is
2123 never referenced by a dynamic object, in which case we
2124 don't need to generate a procedure linkage table entry
2127 /* If this is a local symbol, we resolve it directly without
2128 creating a procedure linkage table entry. */
2132 eh
->zero_undefweak
&= 0x2;
2134 h
->plt
.refcount
= 1;
2137 case R_X86_64_PLTOFF64
:
2138 /* This tries to form the 'address' of a function relative
2139 to GOT. For global symbols we need a PLT entry. */
2143 h
->plt
.refcount
= 1;
2147 case R_X86_64_SIZE32
:
2148 case R_X86_64_SIZE64
:
2153 if (!ABI_64_P (abfd
))
2159 /* Check relocation overflow as these relocs may lead to
2160 run-time relocation overflow. Don't error out for
2161 sections we don't care about, such as debug sections or
2162 when relocation overflow check is disabled. */
2163 if (!htab
->params
->no_reloc_overflow_check
2165 && (bfd_link_pic (info
)
2166 || (bfd_link_executable (info
)
2170 && (sec
->flags
& SEC_READONLY
) == 0)))
2171 return elf_x86_64_need_pic (info
, abfd
, sec
, h
, symtab_hdr
, isym
,
2172 &x86_64_elf_howto_table
[r_type
]);
2178 case R_X86_64_PC32_BND
:
2182 if (eh
!= NULL
&& (sec
->flags
& SEC_CODE
) != 0)
2183 eh
->zero_undefweak
|= 0x2;
2184 /* We are called after all symbols have been resolved. Only
2185 relocation against STT_GNU_IFUNC symbol must go through
2188 && (bfd_link_executable (info
)
2189 || h
->type
== STT_GNU_IFUNC
))
2191 bool func_pointer_ref
= false;
2193 if (r_type
== R_X86_64_PC32
)
2195 /* Since something like ".long foo - ." may be used
2196 as pointer, make sure that PLT is used if foo is
2197 a function defined in a shared library. */
2198 if ((sec
->flags
& SEC_CODE
) == 0)
2200 h
->pointer_equality_needed
= 1;
2201 if (bfd_link_pie (info
)
2202 && h
->type
== STT_FUNC
2207 h
->plt
.refcount
= 1;
2211 else if (r_type
!= R_X86_64_PC32_BND
2212 && r_type
!= R_X86_64_PC64
)
2214 h
->pointer_equality_needed
= 1;
2215 /* At run-time, R_X86_64_64 can be resolved for both
2216 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2217 can only be resolved for x32. */
2218 if ((sec
->flags
& SEC_READONLY
) == 0
2219 && (r_type
== R_X86_64_64
2220 || (!ABI_64_P (abfd
)
2221 && (r_type
== R_X86_64_32
2222 || r_type
== R_X86_64_32S
))))
2223 func_pointer_ref
= true;
2226 if (h
->pointer_equality_needed
2227 && h
->type
== STT_FUNC
2228 && eh
->def_protected
2229 && elf_has_indirect_extern_access (h
->root
.u
.def
.section
->owner
))
2231 /* Disallow non-canonical reference to canonical
2232 protected function. */
2234 /* xgettext:c-format */
2235 (_("%pB: non-canonical reference to canonical "
2236 "protected function `%s' in %pB"),
2237 abfd
, h
->root
.root
.string
,
2238 h
->root
.u
.def
.section
->owner
);
2239 bfd_set_error (bfd_error_bad_value
);
2243 if (!func_pointer_ref
)
2245 /* If this reloc is in a read-only section, we might
2246 need a copy reloc. We can't check reliably at this
2247 stage whether the section is read-only, as input
2248 sections have not yet been mapped to output sections.
2249 Tentatively set the flag for now, and correct in
2250 adjust_dynamic_symbol. */
2253 if (!elf_has_indirect_extern_access (sec
->owner
))
2254 eh
->non_got_ref_without_indirect_extern_access
= 1;
2256 /* We may need a .plt entry if the symbol is a function
2257 defined in a shared lib or is a function referenced
2258 from the code or read-only section. */
2260 || (sec
->flags
& (SEC_CODE
| SEC_READONLY
)) != 0)
2261 h
->plt
.refcount
= 1;
2268 && NEED_DYNAMIC_RELOCATION_P (true, info
, true, h
, sec
,
2270 htab
->pointer_r_type
))
2272 struct elf_dyn_relocs
*p
;
2273 struct elf_dyn_relocs
**head
;
2275 /* If this is a global symbol, we count the number of
2276 relocations we need for this symbol. */
2278 head
= &h
->dyn_relocs
;
2281 /* Track dynamic relocs needed for local syms too.
2282 We really need local syms available to do this
2287 isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
2292 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2296 /* Beware of type punned pointers vs strict aliasing
2298 vpp
= &(elf_section_data (s
)->local_dynrel
);
2299 head
= (struct elf_dyn_relocs
**)vpp
;
2303 if (p
== NULL
|| p
->sec
!= sec
)
2305 size_t amt
= sizeof *p
;
2307 p
= ((struct elf_dyn_relocs
*)
2308 bfd_alloc (htab
->elf
.dynobj
, amt
));
2319 /* Count size relocation as PC-relative relocation. */
2320 if (X86_PCREL_TYPE_P (true, r_type
) || size_reloc
)
2325 /* This relocation describes the C++ object vtable hierarchy.
2326 Reconstruct it for later use during GC. */
2327 case R_X86_64_GNU_VTINHERIT
:
2328 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2332 /* This relocation describes which C++ vtable entries are actually
2333 used. Record for later use during GC. */
2334 case R_X86_64_GNU_VTENTRY
:
2335 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2344 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2346 if (!converted
&& !_bfd_link_keep_memory (info
))
2350 /* Cache the section contents for elf_link_input_bfd if any
2351 load is converted or --no-keep-memory isn't used. */
2352 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2353 info
->cache_size
+= sec
->size
;
2357 /* Cache relocations if any load is converted. */
2358 if (elf_section_data (sec
)->relocs
!= relocs
&& converted
)
2359 elf_section_data (sec
)->relocs
= (Elf_Internal_Rela
*) relocs
;
2364 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2366 sec
->check_relocs_failed
= 1;
2371 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2372 struct bfd_link_info
*info
)
2376 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */
2377 for (abfd
= info
->input_bfds
;
2378 abfd
!= (bfd
*) NULL
;
2379 abfd
= abfd
->link
.next
)
2380 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
2381 && !_bfd_elf_link_iterate_on_relocs (abfd
, info
,
2382 elf_x86_64_scan_relocs
))
2385 return _bfd_x86_elf_always_size_sections (output_bfd
, info
);
2388 /* Return the relocation value for @tpoff relocation
2389 if STT_TLS virtual address is ADDRESS. */
2392 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2394 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2395 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2396 bfd_vma static_tls_size
;
2398 /* If tls_segment is NULL, we should have signalled an error already. */
2399 if (htab
->tls_sec
== NULL
)
2402 /* Consider special static TLS alignment requirements. */
2403 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2404 return address
- static_tls_size
- htab
->tls_sec
->vma
;
2407 /* Relocate an x86_64 ELF section. */
2410 elf_x86_64_relocate_section (bfd
*output_bfd
,
2411 struct bfd_link_info
*info
,
2413 asection
*input_section
,
2415 Elf_Internal_Rela
*relocs
,
2416 Elf_Internal_Sym
*local_syms
,
2417 asection
**local_sections
)
2419 struct elf_x86_link_hash_table
*htab
;
2420 Elf_Internal_Shdr
*symtab_hdr
;
2421 struct elf_link_hash_entry
**sym_hashes
;
2422 bfd_vma
*local_got_offsets
;
2423 bfd_vma
*local_tlsdesc_gotents
;
2424 Elf_Internal_Rela
*rel
;
2425 Elf_Internal_Rela
*wrel
;
2426 Elf_Internal_Rela
*relend
;
2427 unsigned int plt_entry_size
;
2430 /* Skip if check_relocs or scan_relocs failed. */
2431 if (input_section
->check_relocs_failed
)
2434 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
2438 if (!is_x86_elf (input_bfd
, htab
))
2440 bfd_set_error (bfd_error_wrong_format
);
2444 plt_entry_size
= htab
->plt
.plt_entry_size
;
2445 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2446 sym_hashes
= elf_sym_hashes (input_bfd
);
2447 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2448 local_tlsdesc_gotents
= elf_x86_local_tlsdesc_gotent (input_bfd
);
2450 _bfd_x86_elf_set_tls_module_base (info
);
2453 rel
= wrel
= relocs
;
2454 relend
= relocs
+ input_section
->reloc_count
;
2455 for (; rel
< relend
; wrel
++, rel
++)
2457 unsigned int r_type
, r_type_tls
;
2458 reloc_howto_type
*howto
;
2459 unsigned long r_symndx
;
2460 struct elf_link_hash_entry
*h
;
2461 struct elf_x86_link_hash_entry
*eh
;
2462 Elf_Internal_Sym
*sym
;
2464 bfd_vma off
, offplt
, plt_offset
;
2466 bool unresolved_reloc
;
2467 bfd_reloc_status_type r
;
2469 asection
*base_got
, *resolved_plt
;
2471 bool resolved_to_zero
;
2472 bool relative_reloc
;
2473 bool converted_reloc
;
2474 bool need_copy_reloc_in_pie
;
2475 bool no_copyreloc_p
;
2477 r_type
= ELF32_R_TYPE (rel
->r_info
);
2478 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2479 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2486 r_symndx
= htab
->r_sym (rel
->r_info
);
2487 converted_reloc
= (r_type
& R_X86_64_converted_reloc_bit
) != 0;
2488 if (converted_reloc
)
2490 r_type
&= ~R_X86_64_converted_reloc_bit
;
2491 rel
->r_info
= htab
->r_info (r_symndx
, r_type
);
2494 howto
= elf_x86_64_rtype_to_howto (input_bfd
, r_type
);
2496 return _bfd_unrecognized_reloc (input_bfd
, input_section
, r_type
);
2501 unresolved_reloc
= false;
2502 if (r_symndx
< symtab_hdr
->sh_info
)
2504 sym
= local_syms
+ r_symndx
;
2505 sec
= local_sections
[r_symndx
];
2507 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2509 st_size
= sym
->st_size
;
2511 /* Relocate against local STT_GNU_IFUNC symbol. */
2512 if (!bfd_link_relocatable (info
)
2513 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2515 h
= _bfd_elf_x86_get_local_sym_hash (htab
, input_bfd
,
2520 /* Set STT_GNU_IFUNC symbol value. */
2521 h
->root
.u
.def
.value
= sym
->st_value
;
2522 h
->root
.u
.def
.section
= sec
;
2527 bool warned ATTRIBUTE_UNUSED
;
2528 bool ignored ATTRIBUTE_UNUSED
;
2530 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2531 r_symndx
, symtab_hdr
, sym_hashes
,
2533 unresolved_reloc
, warned
, ignored
);
2537 if (sec
!= NULL
&& discarded_section (sec
))
2539 _bfd_clear_contents (howto
, input_bfd
, input_section
,
2540 contents
, rel
->r_offset
);
2541 wrel
->r_offset
= rel
->r_offset
;
2545 /* For ld -r, remove relocations in debug sections against
2546 sections defined in discarded sections. Not done for
2547 eh_frame editing code expects to be present. */
2548 if (bfd_link_relocatable (info
)
2549 && (input_section
->flags
& SEC_DEBUGGING
))
2555 if (bfd_link_relocatable (info
))
2562 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
2564 if (r_type
== R_X86_64_64
)
2566 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
2567 zero-extend it to 64bit if addend is zero. */
2568 r_type
= R_X86_64_32
;
2569 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
2571 else if (r_type
== R_X86_64_SIZE64
)
2573 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
2574 zero-extend it to 64bit if addend is zero. */
2575 r_type
= R_X86_64_SIZE32
;
2576 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
2580 eh
= (struct elf_x86_link_hash_entry
*) h
;
2582 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2583 it here if it is defined in a non-shared object. */
2585 && h
->type
== STT_GNU_IFUNC
2591 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2593 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2594 STT_GNU_IFUNC symbol as STT_FUNC. */
2595 if (elf_section_type (input_section
) == SHT_NOTE
)
2597 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2598 sections because such sections are not SEC_ALLOC and
2599 thus ld.so will not process them. */
2600 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
2610 case R_X86_64_GOTPCREL
:
2611 case R_X86_64_GOTPCRELX
:
2612 case R_X86_64_REX_GOTPCRELX
:
2613 case R_X86_64_GOTPCREL64
:
2614 base_got
= htab
->elf
.sgot
;
2615 off
= h
->got
.offset
;
2617 if (base_got
== NULL
)
2620 if (off
== (bfd_vma
) -1)
2622 /* We can't use h->got.offset here to save state, or
2623 even just remember the offset, as finish_dynamic_symbol
2624 would use that as offset into .got. */
2626 if (h
->plt
.offset
== (bfd_vma
) -1)
2629 if (htab
->elf
.splt
!= NULL
)
2631 plt_index
= (h
->plt
.offset
/ plt_entry_size
2632 - htab
->plt
.has_plt0
);
2633 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2634 base_got
= htab
->elf
.sgotplt
;
2638 plt_index
= h
->plt
.offset
/ plt_entry_size
;
2639 off
= plt_index
* GOT_ENTRY_SIZE
;
2640 base_got
= htab
->elf
.igotplt
;
2643 if (h
->dynindx
== -1
2647 /* This references the local defitionion. We must
2648 initialize this entry in the global offset table.
2649 Since the offset must always be a multiple of 8,
2650 we use the least significant bit to record
2651 whether we have initialized it already.
2653 When doing a dynamic link, we create a .rela.got
2654 relocation entry to initialize the value. This
2655 is done in the finish_dynamic_symbol routine. */
2660 bfd_put_64 (output_bfd
, relocation
,
2661 base_got
->contents
+ off
);
2662 /* Note that this is harmless for the GOTPLT64
2663 case, as -1 | 1 still is -1. */
2669 relocation
= (base_got
->output_section
->vma
2670 + base_got
->output_offset
+ off
);
2675 if (h
->plt
.offset
== (bfd_vma
) -1)
2677 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2678 if (r_type
== htab
->pointer_r_type
2679 && (input_section
->flags
& SEC_CODE
) == 0)
2680 goto do_ifunc_pointer
;
2681 goto bad_ifunc_reloc
;
2684 /* STT_GNU_IFUNC symbol must go through PLT. */
2685 if (htab
->elf
.splt
!= NULL
)
2687 if (htab
->plt_second
!= NULL
)
2689 resolved_plt
= htab
->plt_second
;
2690 plt_offset
= eh
->plt_second
.offset
;
2694 resolved_plt
= htab
->elf
.splt
;
2695 plt_offset
= h
->plt
.offset
;
2700 resolved_plt
= htab
->elf
.iplt
;
2701 plt_offset
= h
->plt
.offset
;
2704 relocation
= (resolved_plt
->output_section
->vma
2705 + resolved_plt
->output_offset
+ plt_offset
);
2711 if (h
->root
.root
.string
)
2712 name
= h
->root
.root
.string
;
2714 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2717 /* xgettext:c-format */
2718 (_("%pB: relocation %s against STT_GNU_IFUNC "
2719 "symbol `%s' isn't supported"), input_bfd
,
2721 bfd_set_error (bfd_error_bad_value
);
2725 if (bfd_link_pic (info
))
2730 if (ABI_64_P (output_bfd
))
2735 if (rel
->r_addend
!= 0)
2737 if (h
->root
.root
.string
)
2738 name
= h
->root
.root
.string
;
2740 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2743 /* xgettext:c-format */
2744 (_("%pB: relocation %s against STT_GNU_IFUNC "
2745 "symbol `%s' has non-zero addend: %" PRId64
),
2746 input_bfd
, howto
->name
, name
, (int64_t) rel
->r_addend
);
2747 bfd_set_error (bfd_error_bad_value
);
2751 /* Generate dynamic relcoation only when there is a
2752 non-GOT reference in a shared object or there is no
2754 if ((bfd_link_pic (info
) && h
->non_got_ref
)
2755 || h
->plt
.offset
== (bfd_vma
) -1)
2757 Elf_Internal_Rela outrel
;
2760 /* Need a dynamic relocation to get the real function
2762 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2766 if (outrel
.r_offset
== (bfd_vma
) -1
2767 || outrel
.r_offset
== (bfd_vma
) -2)
2770 outrel
.r_offset
+= (input_section
->output_section
->vma
2771 + input_section
->output_offset
);
2773 if (POINTER_LOCAL_IFUNC_P (info
, h
))
2775 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
2776 h
->root
.root
.string
,
2777 h
->root
.u
.def
.section
->owner
);
2779 /* This symbol is resolved locally. */
2780 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
2781 outrel
.r_addend
= (h
->root
.u
.def
.value
2782 + h
->root
.u
.def
.section
->output_section
->vma
2783 + h
->root
.u
.def
.section
->output_offset
);
2785 if (htab
->params
->report_relative_reloc
)
2786 _bfd_x86_elf_link_report_relative_reloc
2787 (info
, input_section
, h
, sym
,
2788 "R_X86_64_IRELATIVE", &outrel
);
2792 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
2793 outrel
.r_addend
= 0;
2796 /* Dynamic relocations are stored in
2797 1. .rela.ifunc section in PIC object.
2798 2. .rela.got section in dynamic executable.
2799 3. .rela.iplt section in static executable. */
2800 if (bfd_link_pic (info
))
2801 sreloc
= htab
->elf
.irelifunc
;
2802 else if (htab
->elf
.splt
!= NULL
)
2803 sreloc
= htab
->elf
.srelgot
;
2805 sreloc
= htab
->elf
.irelplt
;
2806 elf_append_rela (output_bfd
, sreloc
, &outrel
);
2808 /* If this reloc is against an external symbol, we
2809 do not want to fiddle with the addend. Otherwise,
2810 we need to include the symbol value so that it
2811 becomes an addend for the dynamic reloc. For an
2812 internal symbol, we have updated addend. */
2817 case R_X86_64_PC32_BND
:
2819 case R_X86_64_PLT32
:
2820 case R_X86_64_PLT32_BND
:
2826 resolved_to_zero
= (eh
!= NULL
2827 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, eh
));
2829 /* When generating a shared object, the relocations handled here are
2830 copied into the output file to be resolved at run time. */
2833 case R_X86_64_GOT32
:
2834 case R_X86_64_GOT64
:
2835 /* Relocation is to the entry for this symbol in the global
2837 case R_X86_64_GOTPCREL
:
2838 case R_X86_64_GOTPCRELX
:
2839 case R_X86_64_REX_GOTPCRELX
:
2840 case R_X86_64_GOTPCREL64
:
2841 /* Use global offset table entry as symbol value. */
2842 case R_X86_64_GOTPLT64
:
2843 /* This is obsolete and treated the same as GOT64. */
2844 base_got
= htab
->elf
.sgot
;
2846 if (htab
->elf
.sgot
== NULL
)
2849 relative_reloc
= false;
2852 off
= h
->got
.offset
;
2854 && h
->plt
.offset
!= (bfd_vma
)-1
2855 && off
== (bfd_vma
)-1)
2857 /* We can't use h->got.offset here to save
2858 state, or even just remember the offset, as
2859 finish_dynamic_symbol would use that as offset into
2861 bfd_vma plt_index
= (h
->plt
.offset
/ plt_entry_size
2862 - htab
->plt
.has_plt0
);
2863 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2864 base_got
= htab
->elf
.sgotplt
;
2867 if (RESOLVED_LOCALLY_P (info
, h
, htab
))
2869 /* We must initialize this entry in the global offset
2870 table. Since the offset must always be a multiple
2871 of 8, we use the least significant bit to record
2872 whether we have initialized it already.
2874 When doing a dynamic link, we create a .rela.got
2875 relocation entry to initialize the value. This is
2876 done in the finish_dynamic_symbol routine. */
2881 bfd_put_64 (output_bfd
, relocation
,
2882 base_got
->contents
+ off
);
2883 /* Note that this is harmless for the GOTPLT64 case,
2884 as -1 | 1 still is -1. */
2887 /* NB: Don't generate relative relocation here if
2888 it has been generated by DT_RELR. */
2889 if (!info
->enable_dt_relr
2890 && GENERATE_RELATIVE_RELOC_P (info
, h
))
2892 /* If this symbol isn't dynamic in PIC,
2893 generate R_X86_64_RELATIVE here. */
2894 eh
->no_finish_dynamic_symbol
= 1;
2895 relative_reloc
= true;
2900 unresolved_reloc
= false;
2904 if (local_got_offsets
== NULL
)
2907 off
= local_got_offsets
[r_symndx
];
2909 /* The offset must always be a multiple of 8. We use
2910 the least significant bit to record whether we have
2911 already generated the necessary reloc. */
2916 bfd_put_64 (output_bfd
, relocation
,
2917 base_got
->contents
+ off
);
2918 local_got_offsets
[r_symndx
] |= 1;
2920 /* NB: GOTPCREL relocations against local absolute
2921 symbol store relocation value in the GOT slot
2922 without relative relocation. Don't generate
2923 relative relocation here if it has been generated
2925 if (!info
->enable_dt_relr
2926 && bfd_link_pic (info
)
2927 && !(sym
->st_shndx
== SHN_ABS
2928 && (r_type
== R_X86_64_GOTPCREL
2929 || r_type
== R_X86_64_GOTPCRELX
2930 || r_type
== R_X86_64_REX_GOTPCRELX
)))
2931 relative_reloc
= true;
2938 Elf_Internal_Rela outrel
;
2940 /* We need to generate a R_X86_64_RELATIVE reloc
2941 for the dynamic linker. */
2942 s
= htab
->elf
.srelgot
;
2946 outrel
.r_offset
= (base_got
->output_section
->vma
2947 + base_got
->output_offset
2949 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
2950 outrel
.r_addend
= relocation
;
2952 if (htab
->params
->report_relative_reloc
)
2953 _bfd_x86_elf_link_report_relative_reloc
2954 (info
, input_section
, h
, sym
, "R_X86_64_RELATIVE",
2957 elf_append_rela (output_bfd
, s
, &outrel
);
2960 if (off
>= (bfd_vma
) -2)
2963 relocation
= base_got
->output_section
->vma
2964 + base_got
->output_offset
+ off
;
2965 if (r_type
!= R_X86_64_GOTPCREL
2966 && r_type
!= R_X86_64_GOTPCRELX
2967 && r_type
!= R_X86_64_REX_GOTPCRELX
2968 && r_type
!= R_X86_64_GOTPCREL64
)
2969 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
2970 - htab
->elf
.sgotplt
->output_offset
;
2974 case R_X86_64_GOTOFF64
:
2975 /* Relocation is relative to the start of the global offset
2978 /* Check to make sure it isn't a protected function or data
2979 symbol for shared library since it may not be local when
2980 used as function address or with copy relocation. We also
2981 need to make sure that a symbol is referenced locally. */
2982 if (bfd_link_pic (info
) && h
)
2984 if (!h
->def_regular
)
2988 switch (ELF_ST_VISIBILITY (h
->other
))
2991 v
= _("hidden symbol");
2994 v
= _("internal symbol");
2997 v
= _("protected symbol");
3005 /* xgettext:c-format */
3006 (_("%pB: relocation R_X86_64_GOTOFF64 against undefined %s"
3007 " `%s' can not be used when making a shared object"),
3008 input_bfd
, v
, h
->root
.root
.string
);
3009 bfd_set_error (bfd_error_bad_value
);
3012 else if (!bfd_link_executable (info
)
3013 && !SYMBOL_REFERENCES_LOCAL_P (info
, h
)
3014 && (h
->type
== STT_FUNC
3015 || h
->type
== STT_OBJECT
)
3016 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3019 /* xgettext:c-format */
3020 (_("%pB: relocation R_X86_64_GOTOFF64 against protected %s"
3021 " `%s' can not be used when making a shared object"),
3023 h
->type
== STT_FUNC
? "function" : "data",
3024 h
->root
.root
.string
);
3025 bfd_set_error (bfd_error_bad_value
);
3030 /* Note that sgot is not involved in this
3031 calculation. We always want the start of .got.plt. If we
3032 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3033 permitted by the ABI, we might have to change this
3035 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3036 + htab
->elf
.sgotplt
->output_offset
;
3039 case R_X86_64_GOTPC32
:
3040 case R_X86_64_GOTPC64
:
3041 /* Use global offset table as symbol value. */
3042 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3043 + htab
->elf
.sgotplt
->output_offset
;
3044 unresolved_reloc
= false;
3047 case R_X86_64_PLTOFF64
:
3048 /* Relocation is PLT entry relative to GOT. For local
3049 symbols it's the symbol itself relative to GOT. */
3051 /* See PLT32 handling. */
3052 && (h
->plt
.offset
!= (bfd_vma
) -1
3053 || eh
->plt_got
.offset
!= (bfd_vma
) -1)
3054 && htab
->elf
.splt
!= NULL
)
3056 if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
3058 /* Use the GOT PLT. */
3059 resolved_plt
= htab
->plt_got
;
3060 plt_offset
= eh
->plt_got
.offset
;
3062 else if (htab
->plt_second
!= NULL
)
3064 resolved_plt
= htab
->plt_second
;
3065 plt_offset
= eh
->plt_second
.offset
;
3069 resolved_plt
= htab
->elf
.splt
;
3070 plt_offset
= h
->plt
.offset
;
3073 relocation
= (resolved_plt
->output_section
->vma
3074 + resolved_plt
->output_offset
3076 unresolved_reloc
= false;
3079 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3080 + htab
->elf
.sgotplt
->output_offset
;
3083 case R_X86_64_PLT32
:
3084 case R_X86_64_PLT32_BND
:
3085 /* Relocation is to the entry for this symbol in the
3086 procedure linkage table. */
3088 /* Resolve a PLT32 reloc against a local symbol directly,
3089 without using the procedure linkage table. */
3093 if ((h
->plt
.offset
== (bfd_vma
) -1
3094 && eh
->plt_got
.offset
== (bfd_vma
) -1)
3095 || htab
->elf
.splt
== NULL
)
3097 /* We didn't make a PLT entry for this symbol. This
3098 happens when statically linking PIC code, or when
3099 using -Bsymbolic. */
3104 if (h
->plt
.offset
!= (bfd_vma
) -1)
3106 if (htab
->plt_second
!= NULL
)
3108 resolved_plt
= htab
->plt_second
;
3109 plt_offset
= eh
->plt_second
.offset
;
3113 resolved_plt
= htab
->elf
.splt
;
3114 plt_offset
= h
->plt
.offset
;
3119 /* Use the GOT PLT. */
3120 resolved_plt
= htab
->plt_got
;
3121 plt_offset
= eh
->plt_got
.offset
;
3124 relocation
= (resolved_plt
->output_section
->vma
3125 + resolved_plt
->output_offset
3127 unresolved_reloc
= false;
3130 case R_X86_64_SIZE32
:
3131 case R_X86_64_SIZE64
:
3132 /* Set to symbol size. */
3133 relocation
= st_size
;
3139 case R_X86_64_PC32_BND
:
3140 /* Don't complain about -fPIC if the symbol is undefined when
3141 building executable unless it is unresolved weak symbol,
3142 references a dynamic definition in PIE or -z nocopyreloc
3145 = (info
->nocopyreloc
3147 && !h
->root
.linker_def
3148 && !h
->root
.ldscript_def
3149 && eh
->def_protected
3150 && elf_has_no_copy_on_protected (h
->root
.u
.def
.section
->owner
)));
3152 if ((input_section
->flags
& SEC_ALLOC
) != 0
3153 && (input_section
->flags
& SEC_READONLY
) != 0
3155 && ((bfd_link_executable (info
)
3156 && ((h
->root
.type
== bfd_link_hash_undefweak
3158 || !UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
3160 || (bfd_link_pie (info
)
3161 && !SYMBOL_DEFINED_NON_SHARED_P (h
)
3165 && !(h
->root
.u
.def
.section
->flags
& SEC_CODE
))))
3166 || (bfd_link_pie (info
)
3167 && h
->root
.type
== bfd_link_hash_undefweak
)
3168 || bfd_link_dll (info
)))
3171 if (SYMBOL_REFERENCES_LOCAL_P (info
, h
))
3173 /* Symbol is referenced locally. Make sure it is
3175 fail
= !SYMBOL_DEFINED_NON_SHARED_P (h
);
3177 else if (bfd_link_pie (info
))
3179 /* We can only use PC-relative relocations in PIE
3180 from non-code sections. */
3181 if (h
->root
.type
== bfd_link_hash_undefweak
3182 || (h
->type
== STT_FUNC
3183 && (sec
->flags
& SEC_CODE
) != 0))
3186 else if (no_copyreloc_p
|| bfd_link_dll (info
))
3188 /* Symbol doesn't need copy reloc and isn't
3189 referenced locally. Don't allow PC-relative
3190 relocations against default and protected
3191 symbols since address of protected function
3192 and location of protected data may not be in
3193 the shared object. */
3194 fail
= (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3195 || ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
);
3199 return elf_x86_64_need_pic (info
, input_bfd
, input_section
,
3200 h
, NULL
, NULL
, howto
);
3202 /* Since x86-64 has PC-relative PLT, we can use PLT in PIE
3203 as function address. */
3205 && (input_section
->flags
& SEC_CODE
) == 0
3206 && bfd_link_pie (info
)
3207 && h
->type
== STT_FUNC
3218 /* FIXME: The ABI says the linker should make sure the value is
3219 the same when it's zeroextended to 64 bit. */
3222 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3225 need_copy_reloc_in_pie
= (bfd_link_pie (info
)
3230 == bfd_link_hash_undefined
))
3231 && (X86_PCREL_TYPE_P (true, r_type
)
3232 || X86_SIZE_TYPE_P (true,
3235 if (GENERATE_DYNAMIC_RELOCATION_P (true, info
, eh
, r_type
, sec
,
3236 need_copy_reloc_in_pie
,
3237 resolved_to_zero
, false))
3239 Elf_Internal_Rela outrel
;
3240 bool skip
, relocate
;
3241 bool generate_dynamic_reloc
= true;
3243 const char *relative_reloc_name
= NULL
;
3245 /* When generating a shared object, these relocations
3246 are copied into the output file to be resolved at run
3252 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3254 if (outrel
.r_offset
== (bfd_vma
) -1)
3256 else if (outrel
.r_offset
== (bfd_vma
) -2)
3257 skip
= true, relocate
= true;
3259 outrel
.r_offset
+= (input_section
->output_section
->vma
3260 + input_section
->output_offset
);
3263 memset (&outrel
, 0, sizeof outrel
);
3265 else if (COPY_INPUT_RELOC_P (true, info
, h
, r_type
))
3267 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3268 outrel
.r_addend
= rel
->r_addend
;
3272 /* This symbol is local, or marked to become local.
3273 When relocation overflow check is disabled, we
3274 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
3275 if (r_type
== htab
->pointer_r_type
3276 || (r_type
== R_X86_64_32
3277 && htab
->params
->no_reloc_overflow_check
))
3280 /* NB: Don't generate relative relocation here if
3281 it has been generated by DT_RELR. */
3282 if (info
->enable_dt_relr
)
3283 generate_dynamic_reloc
= false;
3287 htab
->r_info (0, R_X86_64_RELATIVE
);
3288 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3289 relative_reloc_name
= "R_X86_64_RELATIVE";
3292 else if (r_type
== R_X86_64_64
3293 && !ABI_64_P (output_bfd
))
3296 outrel
.r_info
= htab
->r_info (0,
3297 R_X86_64_RELATIVE64
);
3298 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3299 relative_reloc_name
= "R_X86_64_RELATIVE64";
3300 /* Check addend overflow. */
3301 if ((outrel
.r_addend
& 0x80000000)
3302 != (rel
->r_addend
& 0x80000000))
3305 int addend
= rel
->r_addend
;
3306 if (h
&& h
->root
.root
.string
)
3307 name
= h
->root
.root
.string
;
3309 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3312 /* xgettext:c-format */
3313 (_("%pB: addend %s%#x in relocation %s against "
3314 "symbol `%s' at %#" PRIx64
3315 " in section `%pA' is out of range"),
3316 input_bfd
, addend
< 0 ? "-" : "", addend
,
3317 howto
->name
, name
, (uint64_t) rel
->r_offset
,
3319 bfd_set_error (bfd_error_bad_value
);
3327 if (bfd_is_abs_section (sec
))
3329 else if (sec
== NULL
|| sec
->owner
== NULL
)
3331 bfd_set_error (bfd_error_bad_value
);
3338 /* We are turning this relocation into one
3339 against a section symbol. It would be
3340 proper to subtract the symbol's value,
3341 osec->vma, from the emitted reloc addend,
3342 but ld.so expects buggy relocs. */
3343 osec
= sec
->output_section
;
3344 sindx
= elf_section_data (osec
)->dynindx
;
3347 asection
*oi
= htab
->elf
.text_index_section
;
3348 sindx
= elf_section_data (oi
)->dynindx
;
3350 BFD_ASSERT (sindx
!= 0);
3353 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3354 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3358 if (generate_dynamic_reloc
)
3360 sreloc
= elf_section_data (input_section
)->sreloc
;
3362 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3364 r
= bfd_reloc_notsupported
;
3365 goto check_relocation_error
;
3368 if (relative_reloc_name
3369 && htab
->params
->report_relative_reloc
)
3370 _bfd_x86_elf_link_report_relative_reloc
3371 (info
, input_section
, h
, sym
,
3372 relative_reloc_name
, &outrel
);
3374 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3377 /* If this reloc is against an external symbol, we do
3378 not want to fiddle with the addend. Otherwise, we
3379 need to include the symbol value so that it becomes
3380 an addend for the dynamic reloc. */
3387 case R_X86_64_TLSGD
:
3388 case R_X86_64_GOTPC32_TLSDESC
:
3389 case R_X86_64_TLSDESC_CALL
:
3390 case R_X86_64_GOTTPOFF
:
3391 tls_type
= GOT_UNKNOWN
;
3392 if (h
== NULL
&& local_got_offsets
)
3393 tls_type
= elf_x86_local_got_tls_type (input_bfd
) [r_symndx
];
3395 tls_type
= elf_x86_hash_entry (h
)->tls_type
;
3397 r_type_tls
= r_type
;
3398 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3399 input_section
, contents
,
3400 symtab_hdr
, sym_hashes
,
3401 &r_type_tls
, tls_type
, rel
,
3402 relend
, h
, r_symndx
, true))
3405 if (r_type_tls
== R_X86_64_TPOFF32
)
3407 bfd_vma roff
= rel
->r_offset
;
3409 BFD_ASSERT (! unresolved_reloc
);
3411 if (r_type
== R_X86_64_TLSGD
)
3413 /* GD->LE transition. For 64bit, change
3414 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3415 .word 0x6666; rex64; call __tls_get_addr@PLT
3417 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3419 call *__tls_get_addr@GOTPCREL(%rip)
3420 which may be converted to
3421 addr32 call __tls_get_addr
3424 leaq foo@tpoff(%rax), %rax
3426 leaq foo@tlsgd(%rip), %rdi
3427 .word 0x6666; rex64; call __tls_get_addr@PLT
3429 leaq foo@tlsgd(%rip), %rdi
3431 call *__tls_get_addr@GOTPCREL(%rip)
3432 which may be converted to
3433 addr32 call __tls_get_addr
3436 leaq foo@tpoff(%rax), %rax
3437 For largepic, change:
3438 leaq foo@tlsgd(%rip), %rdi
3439 movabsq $__tls_get_addr@pltoff, %rax
3444 leaq foo@tpoff(%rax), %rax
3445 nopw 0x0(%rax,%rax,1) */
3447 if (ABI_64_P (output_bfd
))
3449 if (contents
[roff
+ 5] == 0xb8)
3452 || (roff
- 3 + 22) > input_section
->size
)
3455 info
->callbacks
->einfo
3456 (_("%F%P: corrupt input: %pB\n"),
3460 memcpy (contents
+ roff
- 3,
3461 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
3462 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3468 || (roff
- 4 + 16) > input_section
->size
)
3470 memcpy (contents
+ roff
- 4,
3471 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3478 || (roff
- 3 + 15) > input_section
->size
)
3480 memcpy (contents
+ roff
- 3,
3481 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3484 bfd_put_32 (output_bfd
,
3485 elf_x86_64_tpoff (info
, relocation
),
3486 contents
+ roff
+ 8 + largepic
);
3487 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
3488 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
3493 else if (r_type
== R_X86_64_GOTPC32_TLSDESC
)
3495 /* GDesc -> LE transition.
3496 It's originally something like:
3497 leaq x@tlsdesc(%rip), %rax <--- LP64 mode.
3498 rex leal x@tlsdesc(%rip), %eax <--- X32 mode.
3501 movq $x@tpoff, %rax <--- LP64 mode.
3502 rex movl $x@tpoff, %eax <--- X32 mode.
3505 unsigned int val
, type
;
3509 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3510 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3511 bfd_put_8 (output_bfd
,
3512 (type
& 0x48) | ((type
>> 2) & 1),
3513 contents
+ roff
- 3);
3514 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3515 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3516 contents
+ roff
- 1);
3517 bfd_put_32 (output_bfd
,
3518 elf_x86_64_tpoff (info
, relocation
),
3522 else if (r_type
== R_X86_64_TLSDESC_CALL
)
3524 /* GDesc -> LE transition.
3526 call *(%rax) <--- LP64 mode.
3527 call *(%eax) <--- X32 mode.
3529 xchg %ax,%ax <-- LP64 mode.
3530 nopl (%rax) <-- X32 mode.
3532 unsigned int prefix
= 0;
3533 if (!ABI_64_P (input_bfd
))
3535 /* Check for call *x@tlsdesc(%eax). */
3536 if (contents
[roff
] == 0x67)
3541 bfd_put_8 (output_bfd
, 0x0f, contents
+ roff
);
3542 bfd_put_8 (output_bfd
, 0x1f, contents
+ roff
+ 1);
3543 bfd_put_8 (output_bfd
, 0x00, contents
+ roff
+ 2);
3547 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3548 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3552 else if (r_type
== R_X86_64_GOTTPOFF
)
3554 /* IE->LE transition:
3555 For 64bit, originally it can be one of:
3556 movq foo@gottpoff(%rip), %reg
3557 addq foo@gottpoff(%rip), %reg
3560 leaq foo(%reg), %reg
3562 For 32bit, originally it can be one of:
3563 movq foo@gottpoff(%rip), %reg
3564 addl foo@gottpoff(%rip), %reg
3567 leal foo(%reg), %reg
3570 unsigned int val
, type
, reg
;
3573 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3580 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3581 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3590 bfd_put_8 (output_bfd
, 0x49,
3591 contents
+ roff
- 3);
3593 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3597 bfd_put_8 (output_bfd
, 0x41,
3598 contents
+ roff
- 3);
3600 bfd_put_8 (output_bfd
, 0xc7,
3601 contents
+ roff
- 2);
3602 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3603 contents
+ roff
- 1);
3607 /* addq/addl -> addq/addl - addressing with %rsp/%r12
3613 bfd_put_8 (output_bfd
, 0x49,
3614 contents
+ roff
- 3);
3616 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3620 bfd_put_8 (output_bfd
, 0x41,
3621 contents
+ roff
- 3);
3623 bfd_put_8 (output_bfd
, 0x81,
3624 contents
+ roff
- 2);
3625 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3626 contents
+ roff
- 1);
3630 /* addq/addl -> leaq/leal */
3635 bfd_put_8 (output_bfd
, 0x4d,
3636 contents
+ roff
- 3);
3638 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3642 bfd_put_8 (output_bfd
, 0x45,
3643 contents
+ roff
- 3);
3645 bfd_put_8 (output_bfd
, 0x8d,
3646 contents
+ roff
- 2);
3647 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3648 contents
+ roff
- 1);
3650 bfd_put_32 (output_bfd
,
3651 elf_x86_64_tpoff (info
, relocation
),
3659 if (htab
->elf
.sgot
== NULL
)
3664 off
= h
->got
.offset
;
3665 offplt
= elf_x86_hash_entry (h
)->tlsdesc_got
;
3669 if (local_got_offsets
== NULL
)
3672 off
= local_got_offsets
[r_symndx
];
3673 offplt
= local_tlsdesc_gotents
[r_symndx
];
3680 Elf_Internal_Rela outrel
;
3684 if (htab
->elf
.srelgot
== NULL
)
3687 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3689 if (GOT_TLS_GDESC_P (tls_type
))
3691 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3692 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3693 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3694 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3695 + htab
->elf
.sgotplt
->output_offset
3697 + htab
->sgotplt_jump_table_size
);
3698 sreloc
= htab
->elf
.srelplt
;
3700 outrel
.r_addend
= relocation
- _bfd_x86_elf_dtpoff_base (info
);
3702 outrel
.r_addend
= 0;
3703 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3706 sreloc
= htab
->elf
.srelgot
;
3708 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3709 + htab
->elf
.sgot
->output_offset
+ off
);
3711 if (GOT_TLS_GD_P (tls_type
))
3712 dr_type
= R_X86_64_DTPMOD64
;
3713 else if (GOT_TLS_GDESC_P (tls_type
))
3716 dr_type
= R_X86_64_TPOFF64
;
3718 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3719 outrel
.r_addend
= 0;
3720 if ((dr_type
== R_X86_64_TPOFF64
3721 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3722 outrel
.r_addend
= relocation
- _bfd_x86_elf_dtpoff_base (info
);
3723 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
3725 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3727 if (GOT_TLS_GD_P (tls_type
))
3731 BFD_ASSERT (! unresolved_reloc
);
3732 bfd_put_64 (output_bfd
,
3733 relocation
- _bfd_x86_elf_dtpoff_base (info
),
3734 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3738 bfd_put_64 (output_bfd
, 0,
3739 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3740 outrel
.r_info
= htab
->r_info (indx
,
3742 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3743 elf_append_rela (output_bfd
, sreloc
,
3752 local_got_offsets
[r_symndx
] |= 1;
3755 if (off
>= (bfd_vma
) -2
3756 && ! GOT_TLS_GDESC_P (tls_type
))
3758 if (r_type_tls
== r_type
)
3760 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3761 || r_type
== R_X86_64_TLSDESC_CALL
)
3762 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3763 + htab
->elf
.sgotplt
->output_offset
3764 + offplt
+ htab
->sgotplt_jump_table_size
;
3766 relocation
= htab
->elf
.sgot
->output_section
->vma
3767 + htab
->elf
.sgot
->output_offset
+ off
;
3768 unresolved_reloc
= false;
3772 bfd_vma roff
= rel
->r_offset
;
3774 if (r_type
== R_X86_64_TLSGD
)
3776 /* GD->IE transition. For 64bit, change
3777 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3778 .word 0x6666; rex64; call __tls_get_addr@PLT
3780 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3782 call *__tls_get_addr@GOTPCREL(%rip
3783 which may be converted to
3784 addr32 call __tls_get_addr
3787 addq foo@gottpoff(%rip), %rax
3789 leaq foo@tlsgd(%rip), %rdi
3790 .word 0x6666; rex64; call __tls_get_addr@PLT
3792 leaq foo@tlsgd(%rip), %rdi
3794 call *__tls_get_addr@GOTPCREL(%rip)
3795 which may be converted to
3796 addr32 call __tls_get_addr
3799 addq foo@gottpoff(%rip), %rax
3800 For largepic, change:
3801 leaq foo@tlsgd(%rip), %rdi
3802 movabsq $__tls_get_addr@pltoff, %rax
3807 addq foo@gottpoff(%rax), %rax
3808 nopw 0x0(%rax,%rax,1) */
3810 if (ABI_64_P (output_bfd
))
3812 if (contents
[roff
+ 5] == 0xb8)
3815 || (roff
- 3 + 22) > input_section
->size
)
3817 memcpy (contents
+ roff
- 3,
3818 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
3819 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3825 || (roff
- 4 + 16) > input_section
->size
)
3827 memcpy (contents
+ roff
- 4,
3828 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3835 || (roff
- 3 + 15) > input_section
->size
)
3837 memcpy (contents
+ roff
- 3,
3838 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3842 relocation
= (htab
->elf
.sgot
->output_section
->vma
3843 + htab
->elf
.sgot
->output_offset
+ off
3846 - input_section
->output_section
->vma
3847 - input_section
->output_offset
3849 bfd_put_32 (output_bfd
, relocation
,
3850 contents
+ roff
+ 8 + largepic
);
3851 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
3856 else if (r_type
== R_X86_64_GOTPC32_TLSDESC
)
3858 /* GDesc -> IE transition.
3859 It's originally something like:
3860 leaq x@tlsdesc(%rip), %rax <--- LP64 mode.
3861 rex leal x@tlsdesc(%rip), %eax <--- X32 mode.
3864 # before xchg %ax,%ax in LP64 mode.
3865 movq x@gottpoff(%rip), %rax
3866 # before nopl (%rax) in X32 mode.
3867 rex movl x@gottpoff(%rip), %eax
3870 /* Now modify the instruction as appropriate. To
3871 turn a lea into a mov in the form we use it, it
3872 suffices to change the second byte from 0x8d to
3876 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3878 bfd_put_32 (output_bfd
,
3879 htab
->elf
.sgot
->output_section
->vma
3880 + htab
->elf
.sgot
->output_offset
+ off
3882 - input_section
->output_section
->vma
3883 - input_section
->output_offset
3888 else if (r_type
== R_X86_64_TLSDESC_CALL
)
3890 /* GDesc -> IE transition.
3892 call *(%rax) <--- LP64 mode.
3893 call *(%eax) <--- X32 mode.
3896 xchg %ax, %ax <-- LP64 mode.
3897 nopl (%rax) <-- X32 mode.
3900 unsigned int prefix
= 0;
3901 if (!ABI_64_P (input_bfd
))
3903 /* Check for call *x@tlsdesc(%eax). */
3904 if (contents
[roff
] == 0x67)
3909 bfd_put_8 (output_bfd
, 0x0f, contents
+ roff
);
3910 bfd_put_8 (output_bfd
, 0x1f, contents
+ roff
+ 1);
3911 bfd_put_8 (output_bfd
, 0x00, contents
+ roff
+ 2);
3915 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3916 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3925 case R_X86_64_TLSLD
:
3926 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3927 input_section
, contents
,
3928 symtab_hdr
, sym_hashes
,
3929 &r_type
, GOT_UNKNOWN
, rel
,
3930 relend
, h
, r_symndx
, true))
3933 if (r_type
!= R_X86_64_TLSLD
)
3935 /* LD->LE transition:
3936 leaq foo@tlsld(%rip), %rdi
3937 call __tls_get_addr@PLT
3938 For 64bit, we change it into:
3939 .word 0x6666; .byte 0x66; movq %fs:0, %rax
3940 For 32bit, we change it into:
3941 nopl 0x0(%rax); movl %fs:0, %eax
3943 leaq foo@tlsld(%rip), %rdi;
3944 call *__tls_get_addr@GOTPCREL(%rip)
3945 which may be converted to
3946 addr32 call __tls_get_addr
3947 For 64bit, we change it into:
3948 .word 0x6666; .word 0x6666; movq %fs:0, %rax
3949 For 32bit, we change it into:
3950 nopw 0x0(%rax); movl %fs:0, %eax
3951 For largepic, change:
3952 leaq foo@tlsgd(%rip), %rdi
3953 movabsq $__tls_get_addr@pltoff, %rax
3957 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
3960 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3961 if (ABI_64_P (output_bfd
))
3963 if ((rel
->r_offset
+ 5) >= input_section
->size
)
3965 if (contents
[rel
->r_offset
+ 5] == 0xb8)
3967 if (rel
->r_offset
< 3
3968 || (rel
->r_offset
- 3 + 22) > input_section
->size
)
3970 memcpy (contents
+ rel
->r_offset
- 3,
3971 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
3972 "\x64\x48\x8b\x04\x25\0\0\0", 22);
3974 else if (contents
[rel
->r_offset
+ 4] == 0xff
3975 || contents
[rel
->r_offset
+ 4] == 0x67)
3977 if (rel
->r_offset
< 3
3978 || (rel
->r_offset
- 3 + 13) > input_section
->size
)
3980 memcpy (contents
+ rel
->r_offset
- 3,
3981 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
3987 if (rel
->r_offset
< 3
3988 || (rel
->r_offset
- 3 + 12) > input_section
->size
)
3990 memcpy (contents
+ rel
->r_offset
- 3,
3991 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3996 if ((rel
->r_offset
+ 4) >= input_section
->size
)
3998 if (contents
[rel
->r_offset
+ 4] == 0xff)
4000 if (rel
->r_offset
< 3
4001 || (rel
->r_offset
- 3 + 13) > input_section
->size
)
4003 memcpy (contents
+ rel
->r_offset
- 3,
4004 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
4009 if (rel
->r_offset
< 3
4010 || (rel
->r_offset
- 3 + 12) > input_section
->size
)
4012 memcpy (contents
+ rel
->r_offset
- 3,
4013 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4016 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
4017 and R_X86_64_PLTOFF64. */
4023 if (htab
->elf
.sgot
== NULL
)
4026 off
= htab
->tls_ld_or_ldm_got
.offset
;
4031 Elf_Internal_Rela outrel
;
4033 if (htab
->elf
.srelgot
== NULL
)
4036 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4037 + htab
->elf
.sgot
->output_offset
+ off
);
4039 bfd_put_64 (output_bfd
, 0,
4040 htab
->elf
.sgot
->contents
+ off
);
4041 bfd_put_64 (output_bfd
, 0,
4042 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4043 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
4044 outrel
.r_addend
= 0;
4045 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
4047 htab
->tls_ld_or_ldm_got
.offset
|= 1;
4049 relocation
= htab
->elf
.sgot
->output_section
->vma
4050 + htab
->elf
.sgot
->output_offset
+ off
;
4051 unresolved_reloc
= false;
4054 case R_X86_64_DTPOFF32
:
4055 if (!bfd_link_executable (info
)
4056 || (input_section
->flags
& SEC_CODE
) == 0)
4057 relocation
-= _bfd_x86_elf_dtpoff_base (info
);
4059 relocation
= elf_x86_64_tpoff (info
, relocation
);
4062 case R_X86_64_TPOFF32
:
4063 case R_X86_64_TPOFF64
:
4064 BFD_ASSERT (bfd_link_executable (info
));
4065 relocation
= elf_x86_64_tpoff (info
, relocation
);
4068 case R_X86_64_DTPOFF64
:
4069 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
4070 relocation
-= _bfd_x86_elf_dtpoff_base (info
);
4077 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4078 because such sections are not SEC_ALLOC and thus ld.so will
4079 not process them. */
4080 if (unresolved_reloc
4081 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4083 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4084 rel
->r_offset
) != (bfd_vma
) -1)
4089 sec
= h
->root
.u
.def
.section
;
4090 if ((info
->nocopyreloc
4091 || (eh
->def_protected
4092 && elf_has_no_copy_on_protected (h
->root
.u
.def
.section
->owner
)))
4093 && !(h
->root
.u
.def
.section
->flags
& SEC_CODE
))
4094 return elf_x86_64_need_pic (info
, input_bfd
, input_section
,
4095 h
, NULL
, NULL
, howto
);
4100 /* xgettext:c-format */
4101 (_("%pB(%pA+%#" PRIx64
"): "
4102 "unresolvable %s relocation against symbol `%s'"),
4105 (uint64_t) rel
->r_offset
,
4107 h
->root
.root
.string
);
4113 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4114 contents
, rel
->r_offset
,
4115 relocation
, rel
->r_addend
);
4117 check_relocation_error
:
4118 if (r
!= bfd_reloc_ok
)
4123 name
= h
->root
.root
.string
;
4126 name
= bfd_elf_string_from_elf_section (input_bfd
,
4127 symtab_hdr
->sh_link
,
4132 name
= bfd_section_name (sec
);
4135 if (r
== bfd_reloc_overflow
)
4137 if (converted_reloc
)
4139 info
->callbacks
->einfo
4140 ("%X%H:", input_bfd
, input_section
, rel
->r_offset
);
4141 info
->callbacks
->einfo
4142 (_(" failed to convert GOTPCREL relocation against "
4143 "'%s'; relink with --no-relax\n"),
4148 (*info
->callbacks
->reloc_overflow
)
4149 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4150 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
4155 /* xgettext:c-format */
4156 (_("%pB(%pA+%#" PRIx64
"): reloc against `%s': error %d"),
4157 input_bfd
, input_section
,
4158 (uint64_t) rel
->r_offset
, name
, (int) r
);
4169 Elf_Internal_Shdr
*rel_hdr
;
4170 size_t deleted
= rel
- wrel
;
4172 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
4173 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
4174 if (rel_hdr
->sh_size
== 0)
4176 /* It is too late to remove an empty reloc section. Leave
4178 ??? What is wrong with an empty section??? */
4179 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
4182 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
4183 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
4184 input_section
->reloc_count
-= deleted
;
4190 /* Finish up dynamic symbol handling. We set the contents of various
4191 dynamic sections here. */
4194 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
4195 struct bfd_link_info
*info
,
4196 struct elf_link_hash_entry
*h
,
4197 Elf_Internal_Sym
*sym
)
4199 struct elf_x86_link_hash_table
*htab
;
4200 bool use_plt_second
;
4201 struct elf_x86_link_hash_entry
*eh
;
4202 bool local_undefweak
;
4204 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4208 /* Use the second PLT section only if there is .plt section. */
4209 use_plt_second
= htab
->elf
.splt
!= NULL
&& htab
->plt_second
!= NULL
;
4211 eh
= (struct elf_x86_link_hash_entry
*) h
;
4212 if (eh
->no_finish_dynamic_symbol
)
4215 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
4216 resolved undefined weak symbols in executable so that their
4217 references have value 0 at run-time. */
4218 local_undefweak
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, eh
);
4220 if (h
->plt
.offset
!= (bfd_vma
) -1)
4223 bfd_vma got_offset
, plt_offset
;
4224 Elf_Internal_Rela rela
;
4226 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
4227 const struct elf_backend_data
*bed
;
4228 bfd_vma plt_got_pcrel_offset
;
4230 /* When building a static executable, use .iplt, .igot.plt and
4231 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4232 if (htab
->elf
.splt
!= NULL
)
4234 plt
= htab
->elf
.splt
;
4235 gotplt
= htab
->elf
.sgotplt
;
4236 relplt
= htab
->elf
.srelplt
;
4240 plt
= htab
->elf
.iplt
;
4241 gotplt
= htab
->elf
.igotplt
;
4242 relplt
= htab
->elf
.irelplt
;
4245 VERIFY_PLT_ENTRY (info
, h
, plt
, gotplt
, relplt
, local_undefweak
)
4247 /* Get the index in the procedure linkage table which
4248 corresponds to this symbol. This is the index of this symbol
4249 in all the symbols for which we are making plt entries. The
4250 first entry in the procedure linkage table is reserved.
4252 Get the offset into the .got table of the entry that
4253 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4254 bytes. The first three are reserved for the dynamic linker.
4256 For static executables, we don't reserve anything. */
4258 if (plt
== htab
->elf
.splt
)
4260 got_offset
= (h
->plt
.offset
/ htab
->plt
.plt_entry_size
4261 - htab
->plt
.has_plt0
);
4262 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
4266 got_offset
= h
->plt
.offset
/ htab
->plt
.plt_entry_size
;
4267 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
4270 /* Fill in the entry in the procedure linkage table. */
4271 memcpy (plt
->contents
+ h
->plt
.offset
, htab
->plt
.plt_entry
,
4272 htab
->plt
.plt_entry_size
);
4275 memcpy (htab
->plt_second
->contents
+ eh
->plt_second
.offset
,
4276 htab
->non_lazy_plt
->plt_entry
,
4277 htab
->non_lazy_plt
->plt_entry_size
);
4279 resolved_plt
= htab
->plt_second
;
4280 plt_offset
= eh
->plt_second
.offset
;
4285 plt_offset
= h
->plt
.offset
;
4288 /* Insert the relocation positions of the plt section. */
4290 /* Put offset the PC-relative instruction referring to the GOT entry,
4291 subtracting the size of that instruction. */
4292 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
4293 + gotplt
->output_offset
4295 - resolved_plt
->output_section
->vma
4296 - resolved_plt
->output_offset
4298 - htab
->plt
.plt_got_insn_size
);
4300 /* Check PC-relative offset overflow in PLT entry. */
4301 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
4302 /* xgettext:c-format */
4303 info
->callbacks
->einfo (_("%F%pB: PC-relative offset overflow in PLT entry for `%s'\n"),
4304 output_bfd
, h
->root
.root
.string
);
4306 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
4307 (resolved_plt
->contents
+ plt_offset
4308 + htab
->plt
.plt_got_offset
));
4310 /* Fill in the entry in the global offset table, initially this
4311 points to the second part of the PLT entry. Leave the entry
4312 as zero for undefined weak symbol in PIE. No PLT relocation
4313 against undefined weak symbol in PIE. */
4314 if (!local_undefweak
)
4316 if (htab
->plt
.has_plt0
)
4317 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4318 + plt
->output_offset
4320 + htab
->lazy_plt
->plt_lazy_offset
),
4321 gotplt
->contents
+ got_offset
);
4323 /* Fill in the entry in the .rela.plt section. */
4324 rela
.r_offset
= (gotplt
->output_section
->vma
4325 + gotplt
->output_offset
4327 if (PLT_LOCAL_IFUNC_P (info
, h
))
4329 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
4330 h
->root
.root
.string
,
4331 h
->root
.u
.def
.section
->owner
);
4333 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4334 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4335 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4336 rela
.r_addend
= (h
->root
.u
.def
.value
4337 + h
->root
.u
.def
.section
->output_section
->vma
4338 + h
->root
.u
.def
.section
->output_offset
);
4340 if (htab
->params
->report_relative_reloc
)
4341 _bfd_x86_elf_link_report_relative_reloc
4342 (info
, relplt
, h
, sym
, "R_X86_64_IRELATIVE", &rela
);
4344 /* R_X86_64_IRELATIVE comes last. */
4345 plt_index
= htab
->next_irelative_index
--;
4349 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4351 plt_index
= htab
->next_jump_slot_index
++;
4354 /* Don't fill the second and third slots in PLT entry for
4355 static executables nor without PLT0. */
4356 if (plt
== htab
->elf
.splt
&& htab
->plt
.has_plt0
)
4359 = h
->plt
.offset
+ htab
->lazy_plt
->plt_plt_insn_end
;
4361 /* Put relocation index. */
4362 bfd_put_32 (output_bfd
, plt_index
,
4363 (plt
->contents
+ h
->plt
.offset
4364 + htab
->lazy_plt
->plt_reloc_offset
));
4366 /* Put offset for jmp .PLT0 and check for overflow. We don't
4367 check relocation index for overflow since branch displacement
4368 will overflow first. */
4369 if (plt0_offset
> 0x80000000)
4370 /* xgettext:c-format */
4371 info
->callbacks
->einfo (_("%F%pB: branch displacement overflow in PLT entry for `%s'\n"),
4372 output_bfd
, h
->root
.root
.string
);
4373 bfd_put_32 (output_bfd
, - plt0_offset
,
4374 (plt
->contents
+ h
->plt
.offset
4375 + htab
->lazy_plt
->plt_plt_offset
));
4378 bed
= get_elf_backend_data (output_bfd
);
4379 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4380 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4383 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
4385 bfd_vma got_offset
, plt_offset
;
4386 asection
*plt
, *got
;
4388 int32_t got_pcrel_offset
;
4390 /* Set the entry in the GOT procedure linkage table. */
4391 plt
= htab
->plt_got
;
4392 got
= htab
->elf
.sgot
;
4393 got_offset
= h
->got
.offset
;
4395 if (got_offset
== (bfd_vma
) -1
4396 || (h
->type
== STT_GNU_IFUNC
&& h
->def_regular
)
4401 /* Use the non-lazy PLT entry template for the GOT PLT since they
4402 are the identical. */
4403 /* Fill in the entry in the GOT procedure linkage table. */
4404 plt_offset
= eh
->plt_got
.offset
;
4405 memcpy (plt
->contents
+ plt_offset
,
4406 htab
->non_lazy_plt
->plt_entry
,
4407 htab
->non_lazy_plt
->plt_entry_size
);
4409 /* Put offset the PC-relative instruction referring to the GOT
4410 entry, subtracting the size of that instruction. */
4411 got_pcrel_offset
= (got
->output_section
->vma
4412 + got
->output_offset
4414 - plt
->output_section
->vma
4415 - plt
->output_offset
4417 - htab
->non_lazy_plt
->plt_got_insn_size
);
4419 /* Check PC-relative offset overflow in GOT PLT entry. */
4420 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
4421 if ((got_after_plt
&& got_pcrel_offset
< 0)
4422 || (!got_after_plt
&& got_pcrel_offset
> 0))
4423 /* xgettext:c-format */
4424 info
->callbacks
->einfo (_("%F%pB: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
4425 output_bfd
, h
->root
.root
.string
);
4427 bfd_put_32 (output_bfd
, got_pcrel_offset
,
4428 (plt
->contents
+ plt_offset
4429 + htab
->non_lazy_plt
->plt_got_offset
));
4432 if (!local_undefweak
4434 && (h
->plt
.offset
!= (bfd_vma
) -1
4435 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
4437 /* Mark the symbol as undefined, rather than as defined in
4438 the .plt section. Leave the value if there were any
4439 relocations where pointer equality matters (this is a clue
4440 for the dynamic linker, to make function pointer
4441 comparisons work between an application and shared
4442 library), otherwise set it to zero. If a function is only
4443 called from a binary, there is no need to slow down
4444 shared libraries because of that. */
4445 sym
->st_shndx
= SHN_UNDEF
;
4446 if (!h
->pointer_equality_needed
)
4450 _bfd_x86_elf_link_fixup_ifunc_symbol (info
, htab
, h
, sym
);
4452 /* Don't generate dynamic GOT relocation against undefined weak
4453 symbol in executable. */
4454 if (h
->got
.offset
!= (bfd_vma
) -1
4455 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h
)->tls_type
)
4456 && elf_x86_hash_entry (h
)->tls_type
!= GOT_TLS_IE
4457 && !local_undefweak
)
4459 Elf_Internal_Rela rela
;
4460 asection
*relgot
= htab
->elf
.srelgot
;
4461 const char *relative_reloc_name
= NULL
;
4462 bool generate_dynamic_reloc
= true;
4464 /* This symbol has an entry in the global offset table. Set it
4466 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4469 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4470 + htab
->elf
.sgot
->output_offset
4471 + (h
->got
.offset
&~ (bfd_vma
) 1));
4473 /* If this is a static link, or it is a -Bsymbolic link and the
4474 symbol is defined locally or was forced to be local because
4475 of a version file, we just want to emit a RELATIVE reloc.
4476 The entry in the global offset table will already have been
4477 initialized in the relocate_section function. */
4479 && h
->type
== STT_GNU_IFUNC
)
4481 if (h
->plt
.offset
== (bfd_vma
) -1)
4483 /* STT_GNU_IFUNC is referenced without PLT. */
4484 if (htab
->elf
.splt
== NULL
)
4486 /* use .rel[a].iplt section to store .got relocations
4487 in static executable. */
4488 relgot
= htab
->elf
.irelplt
;
4490 if (SYMBOL_REFERENCES_LOCAL_P (info
, h
))
4492 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
4493 h
->root
.root
.string
,
4494 h
->root
.u
.def
.section
->owner
);
4496 rela
.r_info
= htab
->r_info (0,
4497 R_X86_64_IRELATIVE
);
4498 rela
.r_addend
= (h
->root
.u
.def
.value
4499 + h
->root
.u
.def
.section
->output_section
->vma
4500 + h
->root
.u
.def
.section
->output_offset
);
4501 relative_reloc_name
= "R_X86_64_IRELATIVE";
4506 else if (bfd_link_pic (info
))
4508 /* Generate R_X86_64_GLOB_DAT. */
4516 if (!h
->pointer_equality_needed
)
4519 /* For non-shared object, we can't use .got.plt, which
4520 contains the real function addres if we need pointer
4521 equality. We load the GOT entry with the PLT entry. */
4522 if (htab
->plt_second
!= NULL
)
4524 plt
= htab
->plt_second
;
4525 plt_offset
= eh
->plt_second
.offset
;
4529 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4530 plt_offset
= h
->plt
.offset
;
4532 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4533 + plt
->output_offset
4535 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4539 else if (bfd_link_pic (info
)
4540 && SYMBOL_REFERENCES_LOCAL_P (info
, h
))
4542 if (!SYMBOL_DEFINED_NON_SHARED_P (h
))
4544 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4545 if (info
->enable_dt_relr
)
4546 generate_dynamic_reloc
= false;
4549 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4550 rela
.r_addend
= (h
->root
.u
.def
.value
4551 + h
->root
.u
.def
.section
->output_section
->vma
4552 + h
->root
.u
.def
.section
->output_offset
);
4553 relative_reloc_name
= "R_X86_64_RELATIVE";
4558 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4560 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4561 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4562 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4566 if (generate_dynamic_reloc
)
4568 if (relative_reloc_name
!= NULL
4569 && htab
->params
->report_relative_reloc
)
4570 _bfd_x86_elf_link_report_relative_reloc
4571 (info
, relgot
, h
, sym
, relative_reloc_name
, &rela
);
4573 elf_append_rela (output_bfd
, relgot
, &rela
);
4579 Elf_Internal_Rela rela
;
4582 /* This symbol needs a copy reloc. Set it up. */
4583 VERIFY_COPY_RELOC (h
, htab
)
4585 rela
.r_offset
= (h
->root
.u
.def
.value
4586 + h
->root
.u
.def
.section
->output_section
->vma
4587 + h
->root
.u
.def
.section
->output_offset
);
4588 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4590 if (h
->root
.u
.def
.section
== htab
->elf
.sdynrelro
)
4591 s
= htab
->elf
.sreldynrelro
;
4593 s
= htab
->elf
.srelbss
;
4594 elf_append_rela (output_bfd
, s
, &rela
);
4600 /* Finish up local dynamic symbol handling. We set the contents of
4601 various dynamic sections here. */
4604 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4606 struct elf_link_hash_entry
*h
4607 = (struct elf_link_hash_entry
*) *slot
;
4608 struct bfd_link_info
*info
4609 = (struct bfd_link_info
*) inf
;
4611 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4615 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4616 here since undefined weak symbol may not be dynamic and may not be
4617 called for elf_x86_64_finish_dynamic_symbol. */
4620 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry
*bh
,
4623 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
4624 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
4626 if (h
->root
.type
!= bfd_link_hash_undefweak
4627 || h
->dynindx
!= -1)
4630 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4634 /* Used to decide how to sort relocs in an optimal manner for the
4635 dynamic linker, before writing them out. */
4637 static enum elf_reloc_type_class
4638 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
4639 const asection
*rel_sec ATTRIBUTE_UNUSED
,
4640 const Elf_Internal_Rela
*rela
)
4642 bfd
*abfd
= info
->output_bfd
;
4643 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4644 struct elf_x86_link_hash_table
*htab
4645 = elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4647 if (htab
->elf
.dynsym
!= NULL
4648 && htab
->elf
.dynsym
->contents
!= NULL
)
4650 /* Check relocation against STT_GNU_IFUNC symbol if there are
4652 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
4653 if (r_symndx
!= STN_UNDEF
)
4655 Elf_Internal_Sym sym
;
4656 if (!bed
->s
->swap_symbol_in (abfd
,
4657 (htab
->elf
.dynsym
->contents
4658 + r_symndx
* bed
->s
->sizeof_sym
),
4662 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
4663 return reloc_class_ifunc
;
4667 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4669 case R_X86_64_IRELATIVE
:
4670 return reloc_class_ifunc
;
4671 case R_X86_64_RELATIVE
:
4672 case R_X86_64_RELATIVE64
:
4673 return reloc_class_relative
;
4674 case R_X86_64_JUMP_SLOT
:
4675 return reloc_class_plt
;
4677 return reloc_class_copy
;
4679 return reloc_class_normal
;
4683 /* Finish up the dynamic sections. */
4686 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4687 struct bfd_link_info
*info
)
4689 struct elf_x86_link_hash_table
*htab
;
4691 htab
= _bfd_x86_elf_finish_dynamic_sections (output_bfd
, info
);
4695 if (! htab
->elf
.dynamic_sections_created
)
4698 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4700 if (bfd_is_abs_section (htab
->elf
.splt
->output_section
))
4702 info
->callbacks
->einfo
4703 (_("%F%P: discarded output section: `%pA'\n"),
4708 elf_section_data (htab
->elf
.splt
->output_section
)
4709 ->this_hdr
.sh_entsize
= htab
->plt
.plt_entry_size
;
4711 if (htab
->plt
.has_plt0
)
4713 /* Fill in the special first entry in the procedure linkage
4715 memcpy (htab
->elf
.splt
->contents
,
4716 htab
->lazy_plt
->plt0_entry
,
4717 htab
->lazy_plt
->plt0_entry_size
);
4718 /* Add offset for pushq GOT+8(%rip), since the instruction
4719 uses 6 bytes subtract this value. */
4720 bfd_put_32 (output_bfd
,
4721 (htab
->elf
.sgotplt
->output_section
->vma
4722 + htab
->elf
.sgotplt
->output_offset
4724 - htab
->elf
.splt
->output_section
->vma
4725 - htab
->elf
.splt
->output_offset
4727 (htab
->elf
.splt
->contents
4728 + htab
->lazy_plt
->plt0_got1_offset
));
4729 /* Add offset for the PC-relative instruction accessing
4730 GOT+16, subtracting the offset to the end of that
4732 bfd_put_32 (output_bfd
,
4733 (htab
->elf
.sgotplt
->output_section
->vma
4734 + htab
->elf
.sgotplt
->output_offset
4736 - htab
->elf
.splt
->output_section
->vma
4737 - htab
->elf
.splt
->output_offset
4738 - htab
->lazy_plt
->plt0_got2_insn_end
),
4739 (htab
->elf
.splt
->contents
4740 + htab
->lazy_plt
->plt0_got2_offset
));
4743 if (htab
->elf
.tlsdesc_plt
)
4745 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4746 htab
->elf
.sgot
->contents
+ htab
->elf
.tlsdesc_got
);
4748 memcpy (htab
->elf
.splt
->contents
+ htab
->elf
.tlsdesc_plt
,
4749 htab
->lazy_plt
->plt_tlsdesc_entry
,
4750 htab
->lazy_plt
->plt_tlsdesc_entry_size
);
4752 /* Add offset for pushq GOT+8(%rip), since ENDBR64 uses 4
4753 bytes and the instruction uses 6 bytes, subtract these
4755 bfd_put_32 (output_bfd
,
4756 (htab
->elf
.sgotplt
->output_section
->vma
4757 + htab
->elf
.sgotplt
->output_offset
4759 - htab
->elf
.splt
->output_section
->vma
4760 - htab
->elf
.splt
->output_offset
4761 - htab
->elf
.tlsdesc_plt
4762 - htab
->lazy_plt
->plt_tlsdesc_got1_insn_end
),
4763 (htab
->elf
.splt
->contents
4764 + htab
->elf
.tlsdesc_plt
4765 + htab
->lazy_plt
->plt_tlsdesc_got1_offset
));
4766 /* Add offset for indirect branch via GOT+TDG, where TDG
4767 stands for htab->tlsdesc_got, subtracting the offset
4768 to the end of that instruction. */
4769 bfd_put_32 (output_bfd
,
4770 (htab
->elf
.sgot
->output_section
->vma
4771 + htab
->elf
.sgot
->output_offset
4772 + htab
->elf
.tlsdesc_got
4773 - htab
->elf
.splt
->output_section
->vma
4774 - htab
->elf
.splt
->output_offset
4775 - htab
->elf
.tlsdesc_plt
4776 - htab
->lazy_plt
->plt_tlsdesc_got2_insn_end
),
4777 (htab
->elf
.splt
->contents
4778 + htab
->elf
.tlsdesc_plt
4779 + htab
->lazy_plt
->plt_tlsdesc_got2_offset
));
4783 /* Fill PLT entries for undefined weak symbols in PIE. */
4784 if (bfd_link_pie (info
))
4785 bfd_hash_traverse (&info
->hash
->table
,
4786 elf_x86_64_pie_finish_undefweak_symbol
,
4792 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4793 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4794 It has to be done before elf_link_sort_relocs is called so that
4795 dynamic relocations are properly sorted. */
4798 elf_x86_64_output_arch_local_syms
4799 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
4800 struct bfd_link_info
*info
,
4801 void *flaginfo ATTRIBUTE_UNUSED
,
4802 int (*func
) (void *, const char *,
4805 struct elf_link_hash_entry
*) ATTRIBUTE_UNUSED
)
4807 struct elf_x86_link_hash_table
*htab
4808 = elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4812 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4813 htab_traverse (htab
->loc_hash_table
,
4814 elf_x86_64_finish_local_dynamic_symbol
,
4820 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4821 dynamic relocations. */
4824 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
4825 long symcount ATTRIBUTE_UNUSED
,
4826 asymbol
**syms ATTRIBUTE_UNUSED
,
4833 bfd_byte
*plt_contents
;
4835 const struct elf_x86_lazy_plt_layout
*lazy_plt
;
4836 const struct elf_x86_non_lazy_plt_layout
*non_lazy_plt
;
4837 const struct elf_x86_lazy_plt_layout
*lazy_bnd_plt
;
4838 const struct elf_x86_non_lazy_plt_layout
*non_lazy_bnd_plt
;
4839 const struct elf_x86_lazy_plt_layout
*lazy_ibt_plt
;
4840 const struct elf_x86_non_lazy_plt_layout
*non_lazy_ibt_plt
;
4842 enum elf_x86_plt_type plt_type
;
4843 struct elf_x86_plt plts
[] =
4845 { ".plt", NULL
, NULL
, plt_unknown
, 0, 0, 0, 0 },
4846 { ".plt.got", NULL
, NULL
, plt_non_lazy
, 0, 0, 0, 0 },
4847 { ".plt.sec", NULL
, NULL
, plt_second
, 0, 0, 0, 0 },
4848 { ".plt.bnd", NULL
, NULL
, plt_second
, 0, 0, 0, 0 },
4849 { NULL
, NULL
, NULL
, plt_non_lazy
, 0, 0, 0, 0 }
4854 if ((abfd
->flags
& (DYNAMIC
| EXEC_P
)) == 0)
4857 if (dynsymcount
<= 0)
4860 relsize
= bfd_get_dynamic_reloc_upper_bound (abfd
);
4864 lazy_plt
= &elf_x86_64_lazy_plt
;
4865 non_lazy_plt
= &elf_x86_64_non_lazy_plt
;
4866 lazy_bnd_plt
= &elf_x86_64_lazy_bnd_plt
;
4867 non_lazy_bnd_plt
= &elf_x86_64_non_lazy_bnd_plt
;
4868 if (ABI_64_P (abfd
))
4870 lazy_ibt_plt
= &elf_x86_64_lazy_ibt_plt
;
4871 non_lazy_ibt_plt
= &elf_x86_64_non_lazy_ibt_plt
;
4875 lazy_ibt_plt
= &elf_x32_lazy_ibt_plt
;
4876 non_lazy_ibt_plt
= &elf_x32_non_lazy_ibt_plt
;
4880 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
4882 plt
= bfd_get_section_by_name (abfd
, plts
[j
].name
);
4883 if (plt
== NULL
|| plt
->size
== 0)
4886 /* Get the PLT section contents. */
4887 if (!bfd_malloc_and_get_section (abfd
, plt
, &plt_contents
))
4890 /* Check what kind of PLT it is. */
4891 plt_type
= plt_unknown
;
4892 if (plts
[j
].type
== plt_unknown
4893 && (plt
->size
>= (lazy_plt
->plt_entry_size
4894 + lazy_plt
->plt_entry_size
)))
4896 /* Match lazy PLT first. Need to check the first two
4898 if ((memcmp (plt_contents
, lazy_plt
->plt0_entry
,
4899 lazy_plt
->plt0_got1_offset
) == 0)
4900 && (memcmp (plt_contents
+ 6, lazy_plt
->plt0_entry
+ 6,
4902 plt_type
= plt_lazy
;
4903 else if (lazy_bnd_plt
!= NULL
4904 && (memcmp (plt_contents
, lazy_bnd_plt
->plt0_entry
,
4905 lazy_bnd_plt
->plt0_got1_offset
) == 0)
4906 && (memcmp (plt_contents
+ 6,
4907 lazy_bnd_plt
->plt0_entry
+ 6, 3) == 0))
4909 plt_type
= plt_lazy
| plt_second
;
4910 /* The fist entry in the lazy IBT PLT is the same as the
4912 if ((memcmp (plt_contents
+ lazy_ibt_plt
->plt_entry_size
,
4913 lazy_ibt_plt
->plt_entry
,
4914 lazy_ibt_plt
->plt_got_offset
) == 0))
4915 lazy_plt
= lazy_ibt_plt
;
4917 lazy_plt
= lazy_bnd_plt
;
4921 if (non_lazy_plt
!= NULL
4922 && (plt_type
== plt_unknown
|| plt_type
== plt_non_lazy
)
4923 && plt
->size
>= non_lazy_plt
->plt_entry_size
)
4925 /* Match non-lazy PLT. */
4926 if (memcmp (plt_contents
, non_lazy_plt
->plt_entry
,
4927 non_lazy_plt
->plt_got_offset
) == 0)
4928 plt_type
= plt_non_lazy
;
4931 if (plt_type
== plt_unknown
|| plt_type
== plt_second
)
4933 if (non_lazy_bnd_plt
!= NULL
4934 && plt
->size
>= non_lazy_bnd_plt
->plt_entry_size
4935 && (memcmp (plt_contents
, non_lazy_bnd_plt
->plt_entry
,
4936 non_lazy_bnd_plt
->plt_got_offset
) == 0))
4938 /* Match BND PLT. */
4939 plt_type
= plt_second
;
4940 non_lazy_plt
= non_lazy_bnd_plt
;
4942 else if (non_lazy_ibt_plt
!= NULL
4943 && plt
->size
>= non_lazy_ibt_plt
->plt_entry_size
4944 && (memcmp (plt_contents
,
4945 non_lazy_ibt_plt
->plt_entry
,
4946 non_lazy_ibt_plt
->plt_got_offset
) == 0))
4948 /* Match IBT PLT. */
4949 plt_type
= plt_second
;
4950 non_lazy_plt
= non_lazy_ibt_plt
;
4954 if (plt_type
== plt_unknown
)
4956 free (plt_contents
);
4961 plts
[j
].type
= plt_type
;
4963 if ((plt_type
& plt_lazy
))
4965 plts
[j
].plt_got_offset
= lazy_plt
->plt_got_offset
;
4966 plts
[j
].plt_got_insn_size
= lazy_plt
->plt_got_insn_size
;
4967 plts
[j
].plt_entry_size
= lazy_plt
->plt_entry_size
;
4968 /* Skip PLT0 in lazy PLT. */
4973 plts
[j
].plt_got_offset
= non_lazy_plt
->plt_got_offset
;
4974 plts
[j
].plt_got_insn_size
= non_lazy_plt
->plt_got_insn_size
;
4975 plts
[j
].plt_entry_size
= non_lazy_plt
->plt_entry_size
;
4979 /* Skip lazy PLT when the second PLT is used. */
4980 if (plt_type
== (plt_lazy
| plt_second
))
4984 n
= plt
->size
/ plts
[j
].plt_entry_size
;
4989 plts
[j
].contents
= plt_contents
;
4992 return _bfd_x86_elf_get_synthetic_symtab (abfd
, count
, relsize
,
4993 (bfd_vma
) 0, plts
, dynsyms
,
4997 /* Handle an x86-64 specific section when reading an object file. This
4998 is called when elfcode.h finds a section with an unknown type. */
5001 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
5002 const char *name
, int shindex
)
5004 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
5007 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
5013 /* Hook called by the linker routine which adds symbols from an object
5014 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5018 elf_x86_64_add_symbol_hook (bfd
*abfd
,
5019 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5020 Elf_Internal_Sym
*sym
,
5021 const char **namep ATTRIBUTE_UNUSED
,
5022 flagword
*flagsp ATTRIBUTE_UNUSED
,
5028 switch (sym
->st_shndx
)
5030 case SHN_X86_64_LCOMMON
:
5031 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
5034 lcomm
= bfd_make_section_with_flags (abfd
,
5038 | SEC_LINKER_CREATED
));
5041 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
5044 *valp
= sym
->st_size
;
5052 /* Given a BFD section, try to locate the corresponding ELF section
5056 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
5057 asection
*sec
, int *index_return
)
5059 if (sec
== &_bfd_elf_large_com_section
)
5061 *index_return
= SHN_X86_64_LCOMMON
;
5067 /* Process a symbol. */
5070 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
5073 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
5075 switch (elfsym
->internal_elf_sym
.st_shndx
)
5077 case SHN_X86_64_LCOMMON
:
5078 asym
->section
= &_bfd_elf_large_com_section
;
5079 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
5080 /* Common symbol doesn't set BSF_GLOBAL. */
5081 asym
->flags
&= ~BSF_GLOBAL
;
5087 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
5089 return (sym
->st_shndx
== SHN_COMMON
5090 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
5094 elf_x86_64_common_section_index (asection
*sec
)
5096 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5099 return SHN_X86_64_LCOMMON
;
5103 elf_x86_64_common_section (asection
*sec
)
5105 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5106 return bfd_com_section_ptr
;
5108 return &_bfd_elf_large_com_section
;
5112 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
5113 const Elf_Internal_Sym
*sym
,
5118 const asection
*oldsec
)
5120 /* A normal common symbol and a large common symbol result in a
5121 normal common symbol. We turn the large common symbol into a
5124 && h
->root
.type
== bfd_link_hash_common
5126 && bfd_is_com_section (*psec
)
5129 if (sym
->st_shndx
== SHN_COMMON
5130 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
5132 h
->root
.u
.c
.p
->section
5133 = bfd_make_section_old_way (oldbfd
, "COMMON");
5134 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
5136 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
5137 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
5138 *psec
= bfd_com_section_ptr
;
5145 elf_x86_64_additional_program_headers (bfd
*abfd
,
5146 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
5151 /* Check to see if we need a large readonly segment. */
5152 s
= bfd_get_section_by_name (abfd
, ".lrodata");
5153 if (s
&& (s
->flags
& SEC_LOAD
))
5156 /* Check to see if we need a large data segment. Since .lbss sections
5157 is placed right after the .bss section, there should be no need for
5158 a large data segment just because of .lbss. */
5159 s
= bfd_get_section_by_name (abfd
, ".ldata");
5160 if (s
&& (s
->flags
& SEC_LOAD
))
5166 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5169 elf_x86_64_relocs_compatible (const bfd_target
*input
,
5170 const bfd_target
*output
)
5172 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
5173 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
5174 && _bfd_elf_relocs_compatible (input
, output
));
5177 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
5178 with GNU properties if found. Otherwise, return NULL. */
5181 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info
*info
)
5183 struct elf_x86_init_table init_table
;
5184 const struct elf_backend_data
*bed
;
5185 struct elf_x86_link_hash_table
*htab
;
5187 if ((int) R_X86_64_standard
>= (int) R_X86_64_converted_reloc_bit
5188 || (int) R_X86_64_max
<= (int) R_X86_64_converted_reloc_bit
5189 || ((int) (R_X86_64_GNU_VTINHERIT
| R_X86_64_converted_reloc_bit
)
5190 != (int) R_X86_64_GNU_VTINHERIT
)
5191 || ((int) (R_X86_64_GNU_VTENTRY
| R_X86_64_converted_reloc_bit
)
5192 != (int) R_X86_64_GNU_VTENTRY
))
5195 /* This is unused for x86-64. */
5196 init_table
.plt0_pad_byte
= 0x90;
5198 bed
= get_elf_backend_data (info
->output_bfd
);
5199 htab
= elf_x86_hash_table (info
, bed
->target_id
);
5202 if (htab
->params
->bndplt
)
5204 init_table
.lazy_plt
= &elf_x86_64_lazy_bnd_plt
;
5205 init_table
.non_lazy_plt
= &elf_x86_64_non_lazy_bnd_plt
;
5209 init_table
.lazy_plt
= &elf_x86_64_lazy_plt
;
5210 init_table
.non_lazy_plt
= &elf_x86_64_non_lazy_plt
;
5213 if (ABI_64_P (info
->output_bfd
))
5215 init_table
.lazy_ibt_plt
= &elf_x86_64_lazy_ibt_plt
;
5216 init_table
.non_lazy_ibt_plt
= &elf_x86_64_non_lazy_ibt_plt
;
5220 init_table
.lazy_ibt_plt
= &elf_x32_lazy_ibt_plt
;
5221 init_table
.non_lazy_ibt_plt
= &elf_x32_non_lazy_ibt_plt
;
5224 if (ABI_64_P (info
->output_bfd
))
5226 init_table
.r_info
= elf64_r_info
;
5227 init_table
.r_sym
= elf64_r_sym
;
5231 init_table
.r_info
= elf32_r_info
;
5232 init_table
.r_sym
= elf32_r_sym
;
5235 return _bfd_x86_elf_link_setup_gnu_properties (info
, &init_table
);
5238 static const struct bfd_elf_special_section
5239 elf_x86_64_special_sections
[]=
5241 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5242 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5243 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
5244 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5245 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5246 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5247 { NULL
, 0, 0, 0, 0 }
5250 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5251 #define TARGET_LITTLE_NAME "elf64-x86-64"
5252 #define ELF_ARCH bfd_arch_i386
5253 #define ELF_TARGET_ID X86_64_ELF_DATA
5254 #define ELF_MACHINE_CODE EM_X86_64
5255 #if DEFAULT_LD_Z_SEPARATE_CODE
5256 # define ELF_MAXPAGESIZE 0x1000
5258 # define ELF_MAXPAGESIZE 0x200000
5260 #define ELF_COMMONPAGESIZE 0x1000
5262 #define elf_backend_can_gc_sections 1
5263 #define elf_backend_can_refcount 1
5264 #define elf_backend_want_got_plt 1
5265 #define elf_backend_plt_readonly 1
5266 #define elf_backend_want_plt_sym 0
5267 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5268 #define elf_backend_rela_normal 1
5269 #define elf_backend_plt_alignment 4
5270 #define elf_backend_extern_protected_data 1
5271 #define elf_backend_caches_rawsize 1
5272 #define elf_backend_dtrel_excludes_plt 1
5273 #define elf_backend_want_dynrelro 1
5275 #define elf_info_to_howto elf_x86_64_info_to_howto
5277 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5278 #define bfd_elf64_bfd_reloc_name_lookup \
5279 elf_x86_64_reloc_name_lookup
5281 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5282 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5283 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
5284 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5285 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5286 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
5287 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5288 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5290 #define elf_backend_write_core_note elf_x86_64_write_core_note
5292 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5293 #define elf_backend_relocate_section elf_x86_64_relocate_section
5294 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5295 #define elf_backend_object_p elf64_x86_64_elf_object_p
5296 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5298 #define elf_backend_section_from_shdr \
5299 elf_x86_64_section_from_shdr
5301 #define elf_backend_section_from_bfd_section \
5302 elf_x86_64_elf_section_from_bfd_section
5303 #define elf_backend_add_symbol_hook \
5304 elf_x86_64_add_symbol_hook
5305 #define elf_backend_symbol_processing \
5306 elf_x86_64_symbol_processing
5307 #define elf_backend_common_section_index \
5308 elf_x86_64_common_section_index
5309 #define elf_backend_common_section \
5310 elf_x86_64_common_section
5311 #define elf_backend_common_definition \
5312 elf_x86_64_common_definition
5313 #define elf_backend_merge_symbol \
5314 elf_x86_64_merge_symbol
5315 #define elf_backend_special_sections \
5316 elf_x86_64_special_sections
5317 #define elf_backend_additional_program_headers \
5318 elf_x86_64_additional_program_headers
5319 #define elf_backend_setup_gnu_properties \
5320 elf_x86_64_link_setup_gnu_properties
5321 #define elf_backend_hide_symbol \
5322 _bfd_x86_elf_hide_symbol
5325 #define elf64_bed elf64_x86_64_bed
5327 #include "elf64-target.h"
5329 /* CloudABI support. */
5331 #undef TARGET_LITTLE_SYM
5332 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
5333 #undef TARGET_LITTLE_NAME
5334 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
5337 #define ELF_OSABI ELFOSABI_CLOUDABI
5340 #define elf64_bed elf64_x86_64_cloudabi_bed
5342 #include "elf64-target.h"
5344 /* FreeBSD support. */
5346 #undef TARGET_LITTLE_SYM
5347 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5348 #undef TARGET_LITTLE_NAME
5349 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5352 #define ELF_OSABI ELFOSABI_FREEBSD
5355 #define elf64_bed elf64_x86_64_fbsd_bed
5357 #include "elf64-target.h"
5359 /* Solaris 2 support. */
5361 #undef TARGET_LITTLE_SYM
5362 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5363 #undef TARGET_LITTLE_NAME
5364 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5366 #undef ELF_TARGET_OS
5367 #define ELF_TARGET_OS is_solaris
5369 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5370 objects won't be recognized. */
5374 #define elf64_bed elf64_x86_64_sol2_bed
5376 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5378 #undef elf_backend_static_tls_alignment
5379 #define elf_backend_static_tls_alignment 16
5381 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5383 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5385 #undef elf_backend_want_plt_sym
5386 #define elf_backend_want_plt_sym 1
5388 #undef elf_backend_strtab_flags
5389 #define elf_backend_strtab_flags SHF_STRINGS
5392 elf64_x86_64_copy_solaris_special_section_fields (const bfd
*ibfd ATTRIBUTE_UNUSED
,
5393 bfd
*obfd ATTRIBUTE_UNUSED
,
5394 const Elf_Internal_Shdr
*isection ATTRIBUTE_UNUSED
,
5395 Elf_Internal_Shdr
*osection ATTRIBUTE_UNUSED
)
5397 /* PR 19938: FIXME: Need to add code for setting the sh_info
5398 and sh_link fields of Solaris specific section types. */
5402 #undef elf_backend_copy_special_section_fields
5403 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
5405 #include "elf64-target.h"
5407 /* Restore defaults. */
5409 #undef elf_backend_static_tls_alignment
5410 #undef elf_backend_want_plt_sym
5411 #define elf_backend_want_plt_sym 0
5412 #undef elf_backend_strtab_flags
5413 #undef elf_backend_copy_special_section_fields
5415 /* 32bit x86-64 support. */
5417 #undef TARGET_LITTLE_SYM
5418 #define TARGET_LITTLE_SYM x86_64_elf32_vec
5419 #undef TARGET_LITTLE_NAME
5420 #define TARGET_LITTLE_NAME "elf32-x86-64"
5422 #define elf32_bed elf32_x86_64_bed
5425 #define ELF_ARCH bfd_arch_i386
5427 #undef ELF_MACHINE_CODE
5428 #define ELF_MACHINE_CODE EM_X86_64
5430 #undef ELF_TARGET_OS
5433 #define bfd_elf32_bfd_reloc_type_lookup \
5434 elf_x86_64_reloc_type_lookup
5435 #define bfd_elf32_bfd_reloc_name_lookup \
5436 elf_x86_64_reloc_name_lookup
5437 #define bfd_elf32_get_synthetic_symtab \
5438 elf_x86_64_get_synthetic_symtab
5440 #undef elf_backend_object_p
5441 #define elf_backend_object_p \
5442 elf32_x86_64_elf_object_p
5444 #undef elf_backend_bfd_from_remote_memory
5445 #define elf_backend_bfd_from_remote_memory \
5446 _bfd_elf32_bfd_from_remote_memory
5448 #undef elf_backend_size_info
5449 #define elf_backend_size_info \
5450 _bfd_elf32_size_info
5452 #include "elf32-target.h"