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, 0, 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, 8, 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, 4, 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, 4, 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, 4, 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, 4, 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, 8, 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, 8, 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, 8, 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, 4, 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, 4, 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, 4, 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, 2, 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, 2, 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, 1, 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, 1, 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, 8, 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, 8, 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, 8, 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, 4, 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, 4, 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, 4, 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, 4, 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, 4, 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, 8, 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, 8, 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, 4, 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, 8, 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, 8, 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, 8, 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, 8, 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, 8, 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, 4, 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, 8, 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, 4, 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, 0, 0, false, 0,
148 complain_overflow_dont
, bfd_elf_generic_reloc
,
149 "R_X86_64_TLSDESC_CALL",
151 HOWTO(R_X86_64_TLSDESC
, 0, 8, 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, 8, 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, 8, 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, 4, 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, 4, 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, 4, 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, 4, 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, 8, 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, 8, 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, 4, 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 /* At run-time, R_X86_64_64 can be resolved for both
2215 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2216 can only be resolved for x32. Function pointer
2217 reference doesn't need PLT for pointer equality. */
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;
2225 /* IFUNC symbol needs pointer equality in PDE so that
2226 function pointer reference will be resolved to its
2227 PLT entry directly. */
2228 if (!func_pointer_ref
2229 || (bfd_link_pde (info
)
2230 && h
->type
== STT_GNU_IFUNC
))
2231 h
->pointer_equality_needed
= 1;
2234 if (!func_pointer_ref
)
2236 /* If this reloc is in a read-only section, we might
2237 need a copy reloc. We can't check reliably at this
2238 stage whether the section is read-only, as input
2239 sections have not yet been mapped to output sections.
2240 Tentatively set the flag for now, and correct in
2241 adjust_dynamic_symbol. */
2244 if (!elf_has_indirect_extern_access (sec
->owner
))
2245 eh
->non_got_ref_without_indirect_extern_access
= 1;
2247 /* We may need a .plt entry if the symbol is a function
2248 defined in a shared lib or is a function referenced
2249 from the code or read-only section. */
2251 || (sec
->flags
& (SEC_CODE
| SEC_READONLY
)) != 0)
2252 h
->plt
.refcount
= 1;
2254 if (htab
->elf
.target_os
!= is_solaris
2255 && h
->pointer_equality_needed
2256 && h
->type
== STT_FUNC
2257 && eh
->def_protected
2258 && !SYMBOL_DEFINED_NON_SHARED_P (h
)
2261 /* Disallow non-canonical reference to canonical
2262 protected function. */
2264 /* xgettext:c-format */
2265 (_("%pB: non-canonical reference to canonical "
2266 "protected function `%s' in %pB"),
2267 abfd
, h
->root
.root
.string
,
2268 h
->root
.u
.def
.section
->owner
);
2269 bfd_set_error (bfd_error_bad_value
);
2278 && NEED_DYNAMIC_RELOCATION_P (true, info
, true, h
, sec
,
2280 htab
->pointer_r_type
))
2282 struct elf_dyn_relocs
*p
;
2283 struct elf_dyn_relocs
**head
;
2285 /* If this is a global symbol, we count the number of
2286 relocations we need for this symbol. */
2288 head
= &h
->dyn_relocs
;
2291 /* Track dynamic relocs needed for local syms too.
2292 We really need local syms available to do this
2297 isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
2302 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2306 /* Beware of type punned pointers vs strict aliasing
2308 vpp
= &(elf_section_data (s
)->local_dynrel
);
2309 head
= (struct elf_dyn_relocs
**)vpp
;
2313 if (p
== NULL
|| p
->sec
!= sec
)
2315 size_t amt
= sizeof *p
;
2317 p
= ((struct elf_dyn_relocs
*)
2318 bfd_alloc (htab
->elf
.dynobj
, amt
));
2329 /* Count size relocation as PC-relative relocation. */
2330 if (X86_PCREL_TYPE_P (true, r_type
) || size_reloc
)
2335 /* This relocation describes the C++ object vtable hierarchy.
2336 Reconstruct it for later use during GC. */
2337 case R_X86_64_GNU_VTINHERIT
:
2338 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2342 /* This relocation describes which C++ vtable entries are actually
2343 used. Record for later use during GC. */
2344 case R_X86_64_GNU_VTENTRY
:
2345 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2354 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2356 if (!converted
&& !_bfd_link_keep_memory (info
))
2360 /* Cache the section contents for elf_link_input_bfd if any
2361 load is converted or --no-keep-memory isn't used. */
2362 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2363 info
->cache_size
+= sec
->size
;
2367 /* Cache relocations if any load is converted. */
2368 if (elf_section_data (sec
)->relocs
!= relocs
&& converted
)
2369 elf_section_data (sec
)->relocs
= (Elf_Internal_Rela
*) relocs
;
2374 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2376 sec
->check_relocs_failed
= 1;
2381 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2382 struct bfd_link_info
*info
)
2386 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */
2387 for (abfd
= info
->input_bfds
;
2388 abfd
!= (bfd
*) NULL
;
2389 abfd
= abfd
->link
.next
)
2390 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
2391 && !_bfd_elf_link_iterate_on_relocs (abfd
, info
,
2392 elf_x86_64_scan_relocs
))
2395 return _bfd_x86_elf_always_size_sections (output_bfd
, info
);
2398 /* Return the relocation value for @tpoff relocation
2399 if STT_TLS virtual address is ADDRESS. */
2402 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2404 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2405 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2406 bfd_vma static_tls_size
;
2408 /* If tls_segment is NULL, we should have signalled an error already. */
2409 if (htab
->tls_sec
== NULL
)
2412 /* Consider special static TLS alignment requirements. */
2413 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2414 return address
- static_tls_size
- htab
->tls_sec
->vma
;
2417 /* Relocate an x86_64 ELF section. */
2420 elf_x86_64_relocate_section (bfd
*output_bfd
,
2421 struct bfd_link_info
*info
,
2423 asection
*input_section
,
2425 Elf_Internal_Rela
*relocs
,
2426 Elf_Internal_Sym
*local_syms
,
2427 asection
**local_sections
)
2429 struct elf_x86_link_hash_table
*htab
;
2430 Elf_Internal_Shdr
*symtab_hdr
;
2431 struct elf_link_hash_entry
**sym_hashes
;
2432 bfd_vma
*local_got_offsets
;
2433 bfd_vma
*local_tlsdesc_gotents
;
2434 Elf_Internal_Rela
*rel
;
2435 Elf_Internal_Rela
*wrel
;
2436 Elf_Internal_Rela
*relend
;
2437 unsigned int plt_entry_size
;
2440 /* Skip if check_relocs or scan_relocs failed. */
2441 if (input_section
->check_relocs_failed
)
2444 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
2448 if (!is_x86_elf (input_bfd
, htab
))
2450 bfd_set_error (bfd_error_wrong_format
);
2454 plt_entry_size
= htab
->plt
.plt_entry_size
;
2455 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2456 sym_hashes
= elf_sym_hashes (input_bfd
);
2457 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2458 local_tlsdesc_gotents
= elf_x86_local_tlsdesc_gotent (input_bfd
);
2460 _bfd_x86_elf_set_tls_module_base (info
);
2463 rel
= wrel
= relocs
;
2464 relend
= relocs
+ input_section
->reloc_count
;
2465 for (; rel
< relend
; wrel
++, rel
++)
2467 unsigned int r_type
, r_type_tls
;
2468 reloc_howto_type
*howto
;
2469 unsigned long r_symndx
;
2470 struct elf_link_hash_entry
*h
;
2471 struct elf_x86_link_hash_entry
*eh
;
2472 Elf_Internal_Sym
*sym
;
2474 bfd_vma off
, offplt
, plt_offset
;
2476 bool unresolved_reloc
;
2477 bfd_reloc_status_type r
;
2479 asection
*base_got
, *resolved_plt
;
2481 bool resolved_to_zero
;
2482 bool relative_reloc
;
2483 bool converted_reloc
;
2484 bool need_copy_reloc_in_pie
;
2485 bool no_copyreloc_p
;
2487 r_type
= ELF32_R_TYPE (rel
->r_info
);
2488 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2489 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2496 r_symndx
= htab
->r_sym (rel
->r_info
);
2497 converted_reloc
= (r_type
& R_X86_64_converted_reloc_bit
) != 0;
2498 if (converted_reloc
)
2500 r_type
&= ~R_X86_64_converted_reloc_bit
;
2501 rel
->r_info
= htab
->r_info (r_symndx
, r_type
);
2504 howto
= elf_x86_64_rtype_to_howto (input_bfd
, r_type
);
2506 return _bfd_unrecognized_reloc (input_bfd
, input_section
, r_type
);
2511 unresolved_reloc
= false;
2512 if (r_symndx
< symtab_hdr
->sh_info
)
2514 sym
= local_syms
+ r_symndx
;
2515 sec
= local_sections
[r_symndx
];
2517 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2519 st_size
= sym
->st_size
;
2521 /* Relocate against local STT_GNU_IFUNC symbol. */
2522 if (!bfd_link_relocatable (info
)
2523 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2525 h
= _bfd_elf_x86_get_local_sym_hash (htab
, input_bfd
,
2530 /* Set STT_GNU_IFUNC symbol value. */
2531 h
->root
.u
.def
.value
= sym
->st_value
;
2532 h
->root
.u
.def
.section
= sec
;
2537 bool warned ATTRIBUTE_UNUSED
;
2538 bool ignored ATTRIBUTE_UNUSED
;
2540 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2541 r_symndx
, symtab_hdr
, sym_hashes
,
2543 unresolved_reloc
, warned
, ignored
);
2547 if (sec
!= NULL
&& discarded_section (sec
))
2549 _bfd_clear_contents (howto
, input_bfd
, input_section
,
2550 contents
, rel
->r_offset
);
2551 wrel
->r_offset
= rel
->r_offset
;
2555 /* For ld -r, remove relocations in debug sections against
2556 sections defined in discarded sections. Not done for
2557 eh_frame editing code expects to be present. */
2558 if (bfd_link_relocatable (info
)
2559 && (input_section
->flags
& SEC_DEBUGGING
))
2565 if (bfd_link_relocatable (info
))
2572 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
2574 if (r_type
== R_X86_64_64
)
2576 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
2577 zero-extend it to 64bit if addend is zero. */
2578 r_type
= R_X86_64_32
;
2579 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
2581 else if (r_type
== R_X86_64_SIZE64
)
2583 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
2584 zero-extend it to 64bit if addend is zero. */
2585 r_type
= R_X86_64_SIZE32
;
2586 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
2590 eh
= (struct elf_x86_link_hash_entry
*) h
;
2592 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2593 it here if it is defined in a non-shared object. */
2595 && h
->type
== STT_GNU_IFUNC
2601 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2603 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2604 STT_GNU_IFUNC symbol as STT_FUNC. */
2605 if (elf_section_type (input_section
) == SHT_NOTE
)
2607 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2608 sections because such sections are not SEC_ALLOC and
2609 thus ld.so will not process them. */
2610 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
2620 case R_X86_64_GOTPCREL
:
2621 case R_X86_64_GOTPCRELX
:
2622 case R_X86_64_REX_GOTPCRELX
:
2623 case R_X86_64_GOTPCREL64
:
2624 base_got
= htab
->elf
.sgot
;
2625 off
= h
->got
.offset
;
2627 if (base_got
== NULL
)
2630 if (off
== (bfd_vma
) -1)
2632 /* We can't use h->got.offset here to save state, or
2633 even just remember the offset, as finish_dynamic_symbol
2634 would use that as offset into .got. */
2636 if (h
->plt
.offset
== (bfd_vma
) -1)
2639 if (htab
->elf
.splt
!= NULL
)
2641 plt_index
= (h
->plt
.offset
/ plt_entry_size
2642 - htab
->plt
.has_plt0
);
2643 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2644 base_got
= htab
->elf
.sgotplt
;
2648 plt_index
= h
->plt
.offset
/ plt_entry_size
;
2649 off
= plt_index
* GOT_ENTRY_SIZE
;
2650 base_got
= htab
->elf
.igotplt
;
2653 if (h
->dynindx
== -1
2657 /* This references the local defitionion. We must
2658 initialize this entry in the global offset table.
2659 Since the offset must always be a multiple of 8,
2660 we use the least significant bit to record
2661 whether we have initialized it already.
2663 When doing a dynamic link, we create a .rela.got
2664 relocation entry to initialize the value. This
2665 is done in the finish_dynamic_symbol routine. */
2670 bfd_put_64 (output_bfd
, relocation
,
2671 base_got
->contents
+ off
);
2672 /* Note that this is harmless for the GOTPLT64
2673 case, as -1 | 1 still is -1. */
2679 relocation
= (base_got
->output_section
->vma
2680 + base_got
->output_offset
+ off
);
2685 if (h
->plt
.offset
== (bfd_vma
) -1)
2687 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2688 if (r_type
== htab
->pointer_r_type
2689 && (input_section
->flags
& SEC_CODE
) == 0)
2690 goto do_ifunc_pointer
;
2691 goto bad_ifunc_reloc
;
2694 /* STT_GNU_IFUNC symbol must go through PLT. */
2695 if (htab
->elf
.splt
!= NULL
)
2697 if (htab
->plt_second
!= NULL
)
2699 resolved_plt
= htab
->plt_second
;
2700 plt_offset
= eh
->plt_second
.offset
;
2704 resolved_plt
= htab
->elf
.splt
;
2705 plt_offset
= h
->plt
.offset
;
2710 resolved_plt
= htab
->elf
.iplt
;
2711 plt_offset
= h
->plt
.offset
;
2714 relocation
= (resolved_plt
->output_section
->vma
2715 + resolved_plt
->output_offset
+ plt_offset
);
2721 if (h
->root
.root
.string
)
2722 name
= h
->root
.root
.string
;
2724 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2727 /* xgettext:c-format */
2728 (_("%pB: relocation %s against STT_GNU_IFUNC "
2729 "symbol `%s' isn't supported"), input_bfd
,
2731 bfd_set_error (bfd_error_bad_value
);
2735 if (bfd_link_pic (info
))
2740 if (ABI_64_P (output_bfd
))
2745 if (rel
->r_addend
!= 0)
2747 if (h
->root
.root
.string
)
2748 name
= h
->root
.root
.string
;
2750 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2753 /* xgettext:c-format */
2754 (_("%pB: relocation %s against STT_GNU_IFUNC "
2755 "symbol `%s' has non-zero addend: %" PRId64
),
2756 input_bfd
, howto
->name
, name
, (int64_t) rel
->r_addend
);
2757 bfd_set_error (bfd_error_bad_value
);
2761 /* Generate dynamic relcoation only when there is a
2762 non-GOT reference in a shared object or there is no
2764 if ((bfd_link_pic (info
) && h
->non_got_ref
)
2765 || h
->plt
.offset
== (bfd_vma
) -1)
2767 Elf_Internal_Rela outrel
;
2770 /* Need a dynamic relocation to get the real function
2772 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2776 if (outrel
.r_offset
== (bfd_vma
) -1
2777 || outrel
.r_offset
== (bfd_vma
) -2)
2780 outrel
.r_offset
+= (input_section
->output_section
->vma
2781 + input_section
->output_offset
);
2783 if (POINTER_LOCAL_IFUNC_P (info
, h
))
2785 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
2786 h
->root
.root
.string
,
2787 h
->root
.u
.def
.section
->owner
);
2789 /* This symbol is resolved locally. */
2790 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
2791 outrel
.r_addend
= (h
->root
.u
.def
.value
2792 + h
->root
.u
.def
.section
->output_section
->vma
2793 + h
->root
.u
.def
.section
->output_offset
);
2795 if (htab
->params
->report_relative_reloc
)
2796 _bfd_x86_elf_link_report_relative_reloc
2797 (info
, input_section
, h
, sym
,
2798 "R_X86_64_IRELATIVE", &outrel
);
2802 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
2803 outrel
.r_addend
= 0;
2806 /* Dynamic relocations are stored in
2807 1. .rela.ifunc section in PIC object.
2808 2. .rela.got section in dynamic executable.
2809 3. .rela.iplt section in static executable. */
2810 if (bfd_link_pic (info
))
2811 sreloc
= htab
->elf
.irelifunc
;
2812 else if (htab
->elf
.splt
!= NULL
)
2813 sreloc
= htab
->elf
.srelgot
;
2815 sreloc
= htab
->elf
.irelplt
;
2816 elf_append_rela (output_bfd
, sreloc
, &outrel
);
2818 /* If this reloc is against an external symbol, we
2819 do not want to fiddle with the addend. Otherwise,
2820 we need to include the symbol value so that it
2821 becomes an addend for the dynamic reloc. For an
2822 internal symbol, we have updated addend. */
2827 case R_X86_64_PC32_BND
:
2829 case R_X86_64_PLT32
:
2830 case R_X86_64_PLT32_BND
:
2836 resolved_to_zero
= (eh
!= NULL
2837 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, eh
));
2839 /* When generating a shared object, the relocations handled here are
2840 copied into the output file to be resolved at run time. */
2843 case R_X86_64_GOT32
:
2844 case R_X86_64_GOT64
:
2845 /* Relocation is to the entry for this symbol in the global
2847 case R_X86_64_GOTPCREL
:
2848 case R_X86_64_GOTPCRELX
:
2849 case R_X86_64_REX_GOTPCRELX
:
2850 case R_X86_64_GOTPCREL64
:
2851 /* Use global offset table entry as symbol value. */
2852 case R_X86_64_GOTPLT64
:
2853 /* This is obsolete and treated the same as GOT64. */
2854 base_got
= htab
->elf
.sgot
;
2856 if (htab
->elf
.sgot
== NULL
)
2859 relative_reloc
= false;
2862 off
= h
->got
.offset
;
2864 && h
->plt
.offset
!= (bfd_vma
)-1
2865 && off
== (bfd_vma
)-1)
2867 /* We can't use h->got.offset here to save
2868 state, or even just remember the offset, as
2869 finish_dynamic_symbol would use that as offset into
2871 bfd_vma plt_index
= (h
->plt
.offset
/ plt_entry_size
2872 - htab
->plt
.has_plt0
);
2873 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2874 base_got
= htab
->elf
.sgotplt
;
2877 if (RESOLVED_LOCALLY_P (info
, h
, htab
))
2879 /* We must initialize this entry in the global offset
2880 table. Since the offset must always be a multiple
2881 of 8, we use the least significant bit to record
2882 whether we have initialized it already.
2884 When doing a dynamic link, we create a .rela.got
2885 relocation entry to initialize the value. This is
2886 done in the finish_dynamic_symbol routine. */
2891 bfd_put_64 (output_bfd
, relocation
,
2892 base_got
->contents
+ off
);
2893 /* Note that this is harmless for the GOTPLT64 case,
2894 as -1 | 1 still is -1. */
2897 /* NB: Don't generate relative relocation here if
2898 it has been generated by DT_RELR. */
2899 if (!info
->enable_dt_relr
2900 && GENERATE_RELATIVE_RELOC_P (info
, h
))
2902 /* If this symbol isn't dynamic in PIC,
2903 generate R_X86_64_RELATIVE here. */
2904 eh
->no_finish_dynamic_symbol
= 1;
2905 relative_reloc
= true;
2910 unresolved_reloc
= false;
2914 if (local_got_offsets
== NULL
)
2917 off
= local_got_offsets
[r_symndx
];
2919 /* The offset must always be a multiple of 8. We use
2920 the least significant bit to record whether we have
2921 already generated the necessary reloc. */
2926 bfd_put_64 (output_bfd
, relocation
,
2927 base_got
->contents
+ off
);
2928 local_got_offsets
[r_symndx
] |= 1;
2930 /* NB: GOTPCREL relocations against local absolute
2931 symbol store relocation value in the GOT slot
2932 without relative relocation. Don't generate
2933 relative relocation here if it has been generated
2935 if (!info
->enable_dt_relr
2936 && bfd_link_pic (info
)
2937 && !(sym
->st_shndx
== SHN_ABS
2938 && (r_type
== R_X86_64_GOTPCREL
2939 || r_type
== R_X86_64_GOTPCRELX
2940 || r_type
== R_X86_64_REX_GOTPCRELX
)))
2941 relative_reloc
= true;
2948 Elf_Internal_Rela outrel
;
2950 /* We need to generate a R_X86_64_RELATIVE reloc
2951 for the dynamic linker. */
2952 s
= htab
->elf
.srelgot
;
2956 outrel
.r_offset
= (base_got
->output_section
->vma
2957 + base_got
->output_offset
2959 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
2960 outrel
.r_addend
= relocation
;
2962 if (htab
->params
->report_relative_reloc
)
2963 _bfd_x86_elf_link_report_relative_reloc
2964 (info
, input_section
, h
, sym
, "R_X86_64_RELATIVE",
2967 elf_append_rela (output_bfd
, s
, &outrel
);
2970 if (off
>= (bfd_vma
) -2)
2973 relocation
= base_got
->output_section
->vma
2974 + base_got
->output_offset
+ off
;
2975 if (r_type
!= R_X86_64_GOTPCREL
2976 && r_type
!= R_X86_64_GOTPCRELX
2977 && r_type
!= R_X86_64_REX_GOTPCRELX
2978 && r_type
!= R_X86_64_GOTPCREL64
)
2979 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
2980 - htab
->elf
.sgotplt
->output_offset
;
2984 case R_X86_64_GOTOFF64
:
2985 /* Relocation is relative to the start of the global offset
2988 /* Check to make sure it isn't a protected function or data
2989 symbol for shared library since it may not be local when
2990 used as function address or with copy relocation. We also
2991 need to make sure that a symbol is referenced locally. */
2992 if (bfd_link_pic (info
) && h
)
2994 if (!h
->def_regular
)
2998 switch (ELF_ST_VISIBILITY (h
->other
))
3001 v
= _("hidden symbol");
3004 v
= _("internal symbol");
3007 v
= _("protected symbol");
3015 /* xgettext:c-format */
3016 (_("%pB: relocation R_X86_64_GOTOFF64 against undefined %s"
3017 " `%s' can not be used when making a shared object"),
3018 input_bfd
, v
, h
->root
.root
.string
);
3019 bfd_set_error (bfd_error_bad_value
);
3022 else if (!bfd_link_executable (info
)
3023 && !SYMBOL_REFERENCES_LOCAL_P (info
, h
)
3024 && (h
->type
== STT_FUNC
3025 || h
->type
== STT_OBJECT
)
3026 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3029 /* xgettext:c-format */
3030 (_("%pB: relocation R_X86_64_GOTOFF64 against protected %s"
3031 " `%s' can not be used when making a shared object"),
3033 h
->type
== STT_FUNC
? "function" : "data",
3034 h
->root
.root
.string
);
3035 bfd_set_error (bfd_error_bad_value
);
3040 /* Note that sgot is not involved in this
3041 calculation. We always want the start of .got.plt. If we
3042 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3043 permitted by the ABI, we might have to change this
3045 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3046 + htab
->elf
.sgotplt
->output_offset
;
3049 case R_X86_64_GOTPC32
:
3050 case R_X86_64_GOTPC64
:
3051 /* Use global offset table as symbol value. */
3052 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3053 + htab
->elf
.sgotplt
->output_offset
;
3054 unresolved_reloc
= false;
3057 case R_X86_64_PLTOFF64
:
3058 /* Relocation is PLT entry relative to GOT. For local
3059 symbols it's the symbol itself relative to GOT. */
3061 /* See PLT32 handling. */
3062 && (h
->plt
.offset
!= (bfd_vma
) -1
3063 || eh
->plt_got
.offset
!= (bfd_vma
) -1)
3064 && htab
->elf
.splt
!= NULL
)
3066 if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
3068 /* Use the GOT PLT. */
3069 resolved_plt
= htab
->plt_got
;
3070 plt_offset
= eh
->plt_got
.offset
;
3072 else if (htab
->plt_second
!= NULL
)
3074 resolved_plt
= htab
->plt_second
;
3075 plt_offset
= eh
->plt_second
.offset
;
3079 resolved_plt
= htab
->elf
.splt
;
3080 plt_offset
= h
->plt
.offset
;
3083 relocation
= (resolved_plt
->output_section
->vma
3084 + resolved_plt
->output_offset
3086 unresolved_reloc
= false;
3089 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3090 + htab
->elf
.sgotplt
->output_offset
;
3093 case R_X86_64_PLT32
:
3094 case R_X86_64_PLT32_BND
:
3095 /* Relocation is to the entry for this symbol in the
3096 procedure linkage table. */
3098 /* Resolve a PLT32 reloc against a local symbol directly,
3099 without using the procedure linkage table. */
3103 if ((h
->plt
.offset
== (bfd_vma
) -1
3104 && eh
->plt_got
.offset
== (bfd_vma
) -1)
3105 || htab
->elf
.splt
== NULL
)
3107 /* We didn't make a PLT entry for this symbol. This
3108 happens when statically linking PIC code, or when
3109 using -Bsymbolic. */
3114 if (h
->plt
.offset
!= (bfd_vma
) -1)
3116 if (htab
->plt_second
!= NULL
)
3118 resolved_plt
= htab
->plt_second
;
3119 plt_offset
= eh
->plt_second
.offset
;
3123 resolved_plt
= htab
->elf
.splt
;
3124 plt_offset
= h
->plt
.offset
;
3129 /* Use the GOT PLT. */
3130 resolved_plt
= htab
->plt_got
;
3131 plt_offset
= eh
->plt_got
.offset
;
3134 relocation
= (resolved_plt
->output_section
->vma
3135 + resolved_plt
->output_offset
3137 unresolved_reloc
= false;
3140 case R_X86_64_SIZE32
:
3141 case R_X86_64_SIZE64
:
3142 /* Set to symbol size. */
3143 relocation
= st_size
;
3149 case R_X86_64_PC32_BND
:
3150 /* Don't complain about -fPIC if the symbol is undefined when
3151 building executable unless it is unresolved weak symbol,
3152 references a dynamic definition in PIE or -z nocopyreloc
3155 = (info
->nocopyreloc
3157 && !h
->root
.linker_def
3158 && !h
->root
.ldscript_def
3159 && eh
->def_protected
));
3161 if ((input_section
->flags
& SEC_ALLOC
) != 0
3162 && (input_section
->flags
& SEC_READONLY
) != 0
3164 && ((bfd_link_executable (info
)
3165 && ((h
->root
.type
== bfd_link_hash_undefweak
3167 || !UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
3169 || (bfd_link_pie (info
)
3170 && !SYMBOL_DEFINED_NON_SHARED_P (h
)
3174 && !(h
->root
.u
.def
.section
->flags
& SEC_CODE
))))
3175 || (bfd_link_pie (info
)
3176 && h
->root
.type
== bfd_link_hash_undefweak
)
3177 || bfd_link_dll (info
)))
3180 if (SYMBOL_REFERENCES_LOCAL_P (info
, h
))
3182 /* Symbol is referenced locally. Make sure it is
3184 fail
= !SYMBOL_DEFINED_NON_SHARED_P (h
);
3186 else if (bfd_link_pie (info
))
3188 /* We can only use PC-relative relocations in PIE
3189 from non-code sections. */
3190 if (h
->root
.type
== bfd_link_hash_undefweak
3191 || (h
->type
== STT_FUNC
3192 && (sec
->flags
& SEC_CODE
) != 0))
3195 else if (no_copyreloc_p
|| bfd_link_dll (info
))
3197 /* Symbol doesn't need copy reloc and isn't
3198 referenced locally. Don't allow PC-relative
3199 relocations against default and protected
3200 symbols since address of protected function
3201 and location of protected data may not be in
3202 the shared object. */
3203 fail
= (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3204 || ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
);
3208 return elf_x86_64_need_pic (info
, input_bfd
, input_section
,
3209 h
, NULL
, NULL
, howto
);
3211 /* Since x86-64 has PC-relative PLT, we can use PLT in PIE
3212 as function address. */
3214 && (input_section
->flags
& SEC_CODE
) == 0
3215 && bfd_link_pie (info
)
3216 && h
->type
== STT_FUNC
3227 /* FIXME: The ABI says the linker should make sure the value is
3228 the same when it's zeroextended to 64 bit. */
3231 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3234 need_copy_reloc_in_pie
= (bfd_link_pie (info
)
3239 == bfd_link_hash_undefined
))
3240 && (X86_PCREL_TYPE_P (true, r_type
)
3241 || X86_SIZE_TYPE_P (true,
3244 if (GENERATE_DYNAMIC_RELOCATION_P (true, info
, eh
, r_type
, sec
,
3245 need_copy_reloc_in_pie
,
3246 resolved_to_zero
, false))
3248 Elf_Internal_Rela outrel
;
3249 bool skip
, relocate
;
3250 bool generate_dynamic_reloc
= true;
3252 const char *relative_reloc_name
= NULL
;
3254 /* When generating a shared object, these relocations
3255 are copied into the output file to be resolved at run
3261 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3263 if (outrel
.r_offset
== (bfd_vma
) -1)
3265 else if (outrel
.r_offset
== (bfd_vma
) -2)
3266 skip
= true, relocate
= true;
3268 outrel
.r_offset
+= (input_section
->output_section
->vma
3269 + input_section
->output_offset
);
3272 memset (&outrel
, 0, sizeof outrel
);
3274 else if (COPY_INPUT_RELOC_P (true, info
, h
, r_type
))
3276 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3277 outrel
.r_addend
= rel
->r_addend
;
3281 /* This symbol is local, or marked to become local.
3282 When relocation overflow check is disabled, we
3283 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
3284 if (r_type
== htab
->pointer_r_type
3285 || (r_type
== R_X86_64_32
3286 && htab
->params
->no_reloc_overflow_check
))
3289 /* NB: Don't generate relative relocation here if
3290 it has been generated by DT_RELR. */
3291 if (info
->enable_dt_relr
)
3292 generate_dynamic_reloc
= false;
3296 htab
->r_info (0, R_X86_64_RELATIVE
);
3297 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3298 relative_reloc_name
= "R_X86_64_RELATIVE";
3301 else if (r_type
== R_X86_64_64
3302 && !ABI_64_P (output_bfd
))
3305 outrel
.r_info
= htab
->r_info (0,
3306 R_X86_64_RELATIVE64
);
3307 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3308 relative_reloc_name
= "R_X86_64_RELATIVE64";
3309 /* Check addend overflow. */
3310 if ((outrel
.r_addend
& 0x80000000)
3311 != (rel
->r_addend
& 0x80000000))
3314 int addend
= rel
->r_addend
;
3315 if (h
&& h
->root
.root
.string
)
3316 name
= h
->root
.root
.string
;
3318 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3321 /* xgettext:c-format */
3322 (_("%pB: addend %s%#x in relocation %s against "
3323 "symbol `%s' at %#" PRIx64
3324 " in section `%pA' is out of range"),
3325 input_bfd
, addend
< 0 ? "-" : "", addend
,
3326 howto
->name
, name
, (uint64_t) rel
->r_offset
,
3328 bfd_set_error (bfd_error_bad_value
);
3336 if (bfd_is_abs_section (sec
))
3338 else if (sec
== NULL
|| sec
->owner
== NULL
)
3340 bfd_set_error (bfd_error_bad_value
);
3347 /* We are turning this relocation into one
3348 against a section symbol. It would be
3349 proper to subtract the symbol's value,
3350 osec->vma, from the emitted reloc addend,
3351 but ld.so expects buggy relocs. */
3352 osec
= sec
->output_section
;
3353 sindx
= elf_section_data (osec
)->dynindx
;
3356 asection
*oi
= htab
->elf
.text_index_section
;
3357 sindx
= elf_section_data (oi
)->dynindx
;
3359 BFD_ASSERT (sindx
!= 0);
3362 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3363 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3367 if (generate_dynamic_reloc
)
3369 sreloc
= elf_section_data (input_section
)->sreloc
;
3371 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3373 r
= bfd_reloc_notsupported
;
3374 goto check_relocation_error
;
3377 if (relative_reloc_name
3378 && htab
->params
->report_relative_reloc
)
3379 _bfd_x86_elf_link_report_relative_reloc
3380 (info
, input_section
, h
, sym
,
3381 relative_reloc_name
, &outrel
);
3383 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3386 /* If this reloc is against an external symbol, we do
3387 not want to fiddle with the addend. Otherwise, we
3388 need to include the symbol value so that it becomes
3389 an addend for the dynamic reloc. */
3396 case R_X86_64_TLSGD
:
3397 case R_X86_64_GOTPC32_TLSDESC
:
3398 case R_X86_64_TLSDESC_CALL
:
3399 case R_X86_64_GOTTPOFF
:
3400 tls_type
= GOT_UNKNOWN
;
3401 if (h
== NULL
&& local_got_offsets
)
3402 tls_type
= elf_x86_local_got_tls_type (input_bfd
) [r_symndx
];
3404 tls_type
= elf_x86_hash_entry (h
)->tls_type
;
3406 r_type_tls
= r_type
;
3407 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3408 input_section
, contents
,
3409 symtab_hdr
, sym_hashes
,
3410 &r_type_tls
, tls_type
, rel
,
3411 relend
, h
, r_symndx
, true))
3414 if (r_type_tls
== R_X86_64_TPOFF32
)
3416 bfd_vma roff
= rel
->r_offset
;
3418 BFD_ASSERT (! unresolved_reloc
);
3420 if (r_type
== R_X86_64_TLSGD
)
3422 /* GD->LE transition. For 64bit, change
3423 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3424 .word 0x6666; rex64; call __tls_get_addr@PLT
3426 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3428 call *__tls_get_addr@GOTPCREL(%rip)
3429 which may be converted to
3430 addr32 call __tls_get_addr
3433 leaq foo@tpoff(%rax), %rax
3435 leaq foo@tlsgd(%rip), %rdi
3436 .word 0x6666; rex64; call __tls_get_addr@PLT
3438 leaq foo@tlsgd(%rip), %rdi
3440 call *__tls_get_addr@GOTPCREL(%rip)
3441 which may be converted to
3442 addr32 call __tls_get_addr
3445 leaq foo@tpoff(%rax), %rax
3446 For largepic, change:
3447 leaq foo@tlsgd(%rip), %rdi
3448 movabsq $__tls_get_addr@pltoff, %rax
3453 leaq foo@tpoff(%rax), %rax
3454 nopw 0x0(%rax,%rax,1) */
3456 if (ABI_64_P (output_bfd
))
3458 if (contents
[roff
+ 5] == 0xb8)
3461 || (roff
- 3 + 22) > input_section
->size
)
3464 info
->callbacks
->einfo
3465 (_("%F%P: corrupt input: %pB\n"),
3469 memcpy (contents
+ roff
- 3,
3470 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
3471 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3477 || (roff
- 4 + 16) > input_section
->size
)
3479 memcpy (contents
+ roff
- 4,
3480 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3487 || (roff
- 3 + 15) > input_section
->size
)
3489 memcpy (contents
+ roff
- 3,
3490 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3493 bfd_put_32 (output_bfd
,
3494 elf_x86_64_tpoff (info
, relocation
),
3495 contents
+ roff
+ 8 + largepic
);
3496 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
3497 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
3502 else if (r_type
== R_X86_64_GOTPC32_TLSDESC
)
3504 /* GDesc -> LE transition.
3505 It's originally something like:
3506 leaq x@tlsdesc(%rip), %rax <--- LP64 mode.
3507 rex leal x@tlsdesc(%rip), %eax <--- X32 mode.
3510 movq $x@tpoff, %rax <--- LP64 mode.
3511 rex movl $x@tpoff, %eax <--- X32 mode.
3514 unsigned int val
, type
;
3518 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3519 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3520 bfd_put_8 (output_bfd
,
3521 (type
& 0x48) | ((type
>> 2) & 1),
3522 contents
+ roff
- 3);
3523 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3524 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3525 contents
+ roff
- 1);
3526 bfd_put_32 (output_bfd
,
3527 elf_x86_64_tpoff (info
, relocation
),
3531 else if (r_type
== R_X86_64_TLSDESC_CALL
)
3533 /* GDesc -> LE transition.
3535 call *(%rax) <--- LP64 mode.
3536 call *(%eax) <--- X32 mode.
3538 xchg %ax,%ax <-- LP64 mode.
3539 nopl (%rax) <-- X32 mode.
3541 unsigned int prefix
= 0;
3542 if (!ABI_64_P (input_bfd
))
3544 /* Check for call *x@tlsdesc(%eax). */
3545 if (contents
[roff
] == 0x67)
3550 bfd_put_8 (output_bfd
, 0x0f, contents
+ roff
);
3551 bfd_put_8 (output_bfd
, 0x1f, contents
+ roff
+ 1);
3552 bfd_put_8 (output_bfd
, 0x00, contents
+ roff
+ 2);
3556 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3557 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3561 else if (r_type
== R_X86_64_GOTTPOFF
)
3563 /* IE->LE transition:
3564 For 64bit, originally it can be one of:
3565 movq foo@gottpoff(%rip), %reg
3566 addq foo@gottpoff(%rip), %reg
3569 leaq foo(%reg), %reg
3571 For 32bit, originally it can be one of:
3572 movq foo@gottpoff(%rip), %reg
3573 addl foo@gottpoff(%rip), %reg
3576 leal foo(%reg), %reg
3579 unsigned int val
, type
, reg
;
3582 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3589 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3590 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3599 bfd_put_8 (output_bfd
, 0x49,
3600 contents
+ roff
- 3);
3602 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3606 bfd_put_8 (output_bfd
, 0x41,
3607 contents
+ roff
- 3);
3609 bfd_put_8 (output_bfd
, 0xc7,
3610 contents
+ roff
- 2);
3611 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3612 contents
+ roff
- 1);
3616 /* addq/addl -> addq/addl - addressing with %rsp/%r12
3622 bfd_put_8 (output_bfd
, 0x49,
3623 contents
+ roff
- 3);
3625 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3629 bfd_put_8 (output_bfd
, 0x41,
3630 contents
+ roff
- 3);
3632 bfd_put_8 (output_bfd
, 0x81,
3633 contents
+ roff
- 2);
3634 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3635 contents
+ roff
- 1);
3639 /* addq/addl -> leaq/leal */
3644 bfd_put_8 (output_bfd
, 0x4d,
3645 contents
+ roff
- 3);
3647 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3651 bfd_put_8 (output_bfd
, 0x45,
3652 contents
+ roff
- 3);
3654 bfd_put_8 (output_bfd
, 0x8d,
3655 contents
+ roff
- 2);
3656 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3657 contents
+ roff
- 1);
3659 bfd_put_32 (output_bfd
,
3660 elf_x86_64_tpoff (info
, relocation
),
3668 if (htab
->elf
.sgot
== NULL
)
3673 off
= h
->got
.offset
;
3674 offplt
= elf_x86_hash_entry (h
)->tlsdesc_got
;
3678 if (local_got_offsets
== NULL
)
3681 off
= local_got_offsets
[r_symndx
];
3682 offplt
= local_tlsdesc_gotents
[r_symndx
];
3689 Elf_Internal_Rela outrel
;
3693 if (htab
->elf
.srelgot
== NULL
)
3696 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3698 if (GOT_TLS_GDESC_P (tls_type
))
3700 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3701 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3702 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3703 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3704 + htab
->elf
.sgotplt
->output_offset
3706 + htab
->sgotplt_jump_table_size
);
3707 sreloc
= htab
->elf
.srelplt
;
3709 outrel
.r_addend
= relocation
- _bfd_x86_elf_dtpoff_base (info
);
3711 outrel
.r_addend
= 0;
3712 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3715 sreloc
= htab
->elf
.srelgot
;
3717 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3718 + htab
->elf
.sgot
->output_offset
+ off
);
3720 if (GOT_TLS_GD_P (tls_type
))
3721 dr_type
= R_X86_64_DTPMOD64
;
3722 else if (GOT_TLS_GDESC_P (tls_type
))
3725 dr_type
= R_X86_64_TPOFF64
;
3727 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3728 outrel
.r_addend
= 0;
3729 if ((dr_type
== R_X86_64_TPOFF64
3730 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3731 outrel
.r_addend
= relocation
- _bfd_x86_elf_dtpoff_base (info
);
3732 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
3734 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3736 if (GOT_TLS_GD_P (tls_type
))
3740 BFD_ASSERT (! unresolved_reloc
);
3741 bfd_put_64 (output_bfd
,
3742 relocation
- _bfd_x86_elf_dtpoff_base (info
),
3743 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3747 bfd_put_64 (output_bfd
, 0,
3748 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3749 outrel
.r_info
= htab
->r_info (indx
,
3751 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3752 elf_append_rela (output_bfd
, sreloc
,
3761 local_got_offsets
[r_symndx
] |= 1;
3764 if (off
>= (bfd_vma
) -2
3765 && ! GOT_TLS_GDESC_P (tls_type
))
3767 if (r_type_tls
== r_type
)
3769 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3770 || r_type
== R_X86_64_TLSDESC_CALL
)
3771 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3772 + htab
->elf
.sgotplt
->output_offset
3773 + offplt
+ htab
->sgotplt_jump_table_size
;
3775 relocation
= htab
->elf
.sgot
->output_section
->vma
3776 + htab
->elf
.sgot
->output_offset
+ off
;
3777 unresolved_reloc
= false;
3781 bfd_vma roff
= rel
->r_offset
;
3783 if (r_type
== R_X86_64_TLSGD
)
3785 /* GD->IE transition. For 64bit, change
3786 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3787 .word 0x6666; rex64; call __tls_get_addr@PLT
3789 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3791 call *__tls_get_addr@GOTPCREL(%rip
3792 which may be converted to
3793 addr32 call __tls_get_addr
3796 addq foo@gottpoff(%rip), %rax
3798 leaq foo@tlsgd(%rip), %rdi
3799 .word 0x6666; rex64; call __tls_get_addr@PLT
3801 leaq foo@tlsgd(%rip), %rdi
3803 call *__tls_get_addr@GOTPCREL(%rip)
3804 which may be converted to
3805 addr32 call __tls_get_addr
3808 addq foo@gottpoff(%rip), %rax
3809 For largepic, change:
3810 leaq foo@tlsgd(%rip), %rdi
3811 movabsq $__tls_get_addr@pltoff, %rax
3816 addq foo@gottpoff(%rax), %rax
3817 nopw 0x0(%rax,%rax,1) */
3819 if (ABI_64_P (output_bfd
))
3821 if (contents
[roff
+ 5] == 0xb8)
3824 || (roff
- 3 + 22) > input_section
->size
)
3826 memcpy (contents
+ roff
- 3,
3827 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
3828 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3834 || (roff
- 4 + 16) > input_section
->size
)
3836 memcpy (contents
+ roff
- 4,
3837 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3844 || (roff
- 3 + 15) > input_section
->size
)
3846 memcpy (contents
+ roff
- 3,
3847 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3851 relocation
= (htab
->elf
.sgot
->output_section
->vma
3852 + htab
->elf
.sgot
->output_offset
+ off
3855 - input_section
->output_section
->vma
3856 - input_section
->output_offset
3858 bfd_put_32 (output_bfd
, relocation
,
3859 contents
+ roff
+ 8 + largepic
);
3860 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
3865 else if (r_type
== R_X86_64_GOTPC32_TLSDESC
)
3867 /* GDesc -> IE transition.
3868 It's originally something like:
3869 leaq x@tlsdesc(%rip), %rax <--- LP64 mode.
3870 rex leal x@tlsdesc(%rip), %eax <--- X32 mode.
3873 # before xchg %ax,%ax in LP64 mode.
3874 movq x@gottpoff(%rip), %rax
3875 # before nopl (%rax) in X32 mode.
3876 rex movl x@gottpoff(%rip), %eax
3879 /* Now modify the instruction as appropriate. To
3880 turn a lea into a mov in the form we use it, it
3881 suffices to change the second byte from 0x8d to
3885 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3887 bfd_put_32 (output_bfd
,
3888 htab
->elf
.sgot
->output_section
->vma
3889 + htab
->elf
.sgot
->output_offset
+ off
3891 - input_section
->output_section
->vma
3892 - input_section
->output_offset
3897 else if (r_type
== R_X86_64_TLSDESC_CALL
)
3899 /* GDesc -> IE transition.
3901 call *(%rax) <--- LP64 mode.
3902 call *(%eax) <--- X32 mode.
3905 xchg %ax, %ax <-- LP64 mode.
3906 nopl (%rax) <-- X32 mode.
3909 unsigned int prefix
= 0;
3910 if (!ABI_64_P (input_bfd
))
3912 /* Check for call *x@tlsdesc(%eax). */
3913 if (contents
[roff
] == 0x67)
3918 bfd_put_8 (output_bfd
, 0x0f, contents
+ roff
);
3919 bfd_put_8 (output_bfd
, 0x1f, contents
+ roff
+ 1);
3920 bfd_put_8 (output_bfd
, 0x00, contents
+ roff
+ 2);
3924 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3925 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3934 case R_X86_64_TLSLD
:
3935 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3936 input_section
, contents
,
3937 symtab_hdr
, sym_hashes
,
3938 &r_type
, GOT_UNKNOWN
, rel
,
3939 relend
, h
, r_symndx
, true))
3942 if (r_type
!= R_X86_64_TLSLD
)
3944 /* LD->LE transition:
3945 leaq foo@tlsld(%rip), %rdi
3946 call __tls_get_addr@PLT
3947 For 64bit, we change it into:
3948 .word 0x6666; .byte 0x66; movq %fs:0, %rax
3949 For 32bit, we change it into:
3950 nopl 0x0(%rax); movl %fs:0, %eax
3952 leaq foo@tlsld(%rip), %rdi;
3953 call *__tls_get_addr@GOTPCREL(%rip)
3954 which may be converted to
3955 addr32 call __tls_get_addr
3956 For 64bit, we change it into:
3957 .word 0x6666; .word 0x6666; movq %fs:0, %rax
3958 For 32bit, we change it into:
3959 nopw 0x0(%rax); movl %fs:0, %eax
3960 For largepic, change:
3961 leaq foo@tlsgd(%rip), %rdi
3962 movabsq $__tls_get_addr@pltoff, %rax
3966 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
3969 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3970 if (ABI_64_P (output_bfd
))
3972 if ((rel
->r_offset
+ 5) >= input_section
->size
)
3974 if (contents
[rel
->r_offset
+ 5] == 0xb8)
3976 if (rel
->r_offset
< 3
3977 || (rel
->r_offset
- 3 + 22) > input_section
->size
)
3979 memcpy (contents
+ rel
->r_offset
- 3,
3980 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
3981 "\x64\x48\x8b\x04\x25\0\0\0", 22);
3983 else if (contents
[rel
->r_offset
+ 4] == 0xff
3984 || contents
[rel
->r_offset
+ 4] == 0x67)
3986 if (rel
->r_offset
< 3
3987 || (rel
->r_offset
- 3 + 13) > input_section
->size
)
3989 memcpy (contents
+ rel
->r_offset
- 3,
3990 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
3996 if (rel
->r_offset
< 3
3997 || (rel
->r_offset
- 3 + 12) > input_section
->size
)
3999 memcpy (contents
+ rel
->r_offset
- 3,
4000 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4005 if ((rel
->r_offset
+ 4) >= input_section
->size
)
4007 if (contents
[rel
->r_offset
+ 4] == 0xff)
4009 if (rel
->r_offset
< 3
4010 || (rel
->r_offset
- 3 + 13) > input_section
->size
)
4012 memcpy (contents
+ rel
->r_offset
- 3,
4013 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
4018 if (rel
->r_offset
< 3
4019 || (rel
->r_offset
- 3 + 12) > input_section
->size
)
4021 memcpy (contents
+ rel
->r_offset
- 3,
4022 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4025 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
4026 and R_X86_64_PLTOFF64. */
4032 if (htab
->elf
.sgot
== NULL
)
4035 off
= htab
->tls_ld_or_ldm_got
.offset
;
4040 Elf_Internal_Rela outrel
;
4042 if (htab
->elf
.srelgot
== NULL
)
4045 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4046 + htab
->elf
.sgot
->output_offset
+ off
);
4048 bfd_put_64 (output_bfd
, 0,
4049 htab
->elf
.sgot
->contents
+ off
);
4050 bfd_put_64 (output_bfd
, 0,
4051 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4052 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
4053 outrel
.r_addend
= 0;
4054 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
4056 htab
->tls_ld_or_ldm_got
.offset
|= 1;
4058 relocation
= htab
->elf
.sgot
->output_section
->vma
4059 + htab
->elf
.sgot
->output_offset
+ off
;
4060 unresolved_reloc
= false;
4063 case R_X86_64_DTPOFF32
:
4064 if (!bfd_link_executable (info
)
4065 || (input_section
->flags
& SEC_CODE
) == 0)
4066 relocation
-= _bfd_x86_elf_dtpoff_base (info
);
4068 relocation
= elf_x86_64_tpoff (info
, relocation
);
4071 case R_X86_64_TPOFF32
:
4072 case R_X86_64_TPOFF64
:
4073 BFD_ASSERT (bfd_link_executable (info
));
4074 relocation
= elf_x86_64_tpoff (info
, relocation
);
4077 case R_X86_64_DTPOFF64
:
4078 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
4079 relocation
-= _bfd_x86_elf_dtpoff_base (info
);
4086 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4087 because such sections are not SEC_ALLOC and thus ld.so will
4088 not process them. */
4089 if (unresolved_reloc
4090 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4092 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4093 rel
->r_offset
) != (bfd_vma
) -1)
4098 sec
= h
->root
.u
.def
.section
;
4099 if ((info
->nocopyreloc
|| eh
->def_protected
)
4100 && !(h
->root
.u
.def
.section
->flags
& SEC_CODE
))
4101 return elf_x86_64_need_pic (info
, input_bfd
, input_section
,
4102 h
, NULL
, NULL
, howto
);
4107 /* xgettext:c-format */
4108 (_("%pB(%pA+%#" PRIx64
"): "
4109 "unresolvable %s relocation against symbol `%s'"),
4112 (uint64_t) rel
->r_offset
,
4114 h
->root
.root
.string
);
4120 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4121 contents
, rel
->r_offset
,
4122 relocation
, rel
->r_addend
);
4124 check_relocation_error
:
4125 if (r
!= bfd_reloc_ok
)
4130 name
= h
->root
.root
.string
;
4133 name
= bfd_elf_string_from_elf_section (input_bfd
,
4134 symtab_hdr
->sh_link
,
4139 name
= bfd_section_name (sec
);
4142 if (r
== bfd_reloc_overflow
)
4144 if (converted_reloc
)
4146 info
->callbacks
->einfo
4147 ("%X%H:", input_bfd
, input_section
, rel
->r_offset
);
4148 info
->callbacks
->einfo
4149 (_(" failed to convert GOTPCREL relocation against "
4150 "'%s'; relink with --no-relax\n"),
4155 (*info
->callbacks
->reloc_overflow
)
4156 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4157 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
4162 /* xgettext:c-format */
4163 (_("%pB(%pA+%#" PRIx64
"): reloc against `%s': error %d"),
4164 input_bfd
, input_section
,
4165 (uint64_t) rel
->r_offset
, name
, (int) r
);
4176 Elf_Internal_Shdr
*rel_hdr
;
4177 size_t deleted
= rel
- wrel
;
4179 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
4180 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
4181 if (rel_hdr
->sh_size
== 0)
4183 /* It is too late to remove an empty reloc section. Leave
4185 ??? What is wrong with an empty section??? */
4186 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
4189 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
4190 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
4191 input_section
->reloc_count
-= deleted
;
4197 /* Finish up dynamic symbol handling. We set the contents of various
4198 dynamic sections here. */
4201 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
4202 struct bfd_link_info
*info
,
4203 struct elf_link_hash_entry
*h
,
4204 Elf_Internal_Sym
*sym
)
4206 struct elf_x86_link_hash_table
*htab
;
4207 bool use_plt_second
;
4208 struct elf_x86_link_hash_entry
*eh
;
4209 bool local_undefweak
;
4211 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4215 /* Use the second PLT section only if there is .plt section. */
4216 use_plt_second
= htab
->elf
.splt
!= NULL
&& htab
->plt_second
!= NULL
;
4218 eh
= (struct elf_x86_link_hash_entry
*) h
;
4219 if (eh
->no_finish_dynamic_symbol
)
4222 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
4223 resolved undefined weak symbols in executable so that their
4224 references have value 0 at run-time. */
4225 local_undefweak
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, eh
);
4227 if (h
->plt
.offset
!= (bfd_vma
) -1)
4230 bfd_vma got_offset
, plt_offset
;
4231 Elf_Internal_Rela rela
;
4233 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
4234 const struct elf_backend_data
*bed
;
4235 bfd_vma plt_got_pcrel_offset
;
4237 /* When building a static executable, use .iplt, .igot.plt and
4238 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4239 if (htab
->elf
.splt
!= NULL
)
4241 plt
= htab
->elf
.splt
;
4242 gotplt
= htab
->elf
.sgotplt
;
4243 relplt
= htab
->elf
.srelplt
;
4247 plt
= htab
->elf
.iplt
;
4248 gotplt
= htab
->elf
.igotplt
;
4249 relplt
= htab
->elf
.irelplt
;
4252 VERIFY_PLT_ENTRY (info
, h
, plt
, gotplt
, relplt
, local_undefweak
)
4254 /* Get the index in the procedure linkage table which
4255 corresponds to this symbol. This is the index of this symbol
4256 in all the symbols for which we are making plt entries. The
4257 first entry in the procedure linkage table is reserved.
4259 Get the offset into the .got table of the entry that
4260 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4261 bytes. The first three are reserved for the dynamic linker.
4263 For static executables, we don't reserve anything. */
4265 if (plt
== htab
->elf
.splt
)
4267 got_offset
= (h
->plt
.offset
/ htab
->plt
.plt_entry_size
4268 - htab
->plt
.has_plt0
);
4269 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
4273 got_offset
= h
->plt
.offset
/ htab
->plt
.plt_entry_size
;
4274 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
4277 /* Fill in the entry in the procedure linkage table. */
4278 memcpy (plt
->contents
+ h
->plt
.offset
, htab
->plt
.plt_entry
,
4279 htab
->plt
.plt_entry_size
);
4282 memcpy (htab
->plt_second
->contents
+ eh
->plt_second
.offset
,
4283 htab
->non_lazy_plt
->plt_entry
,
4284 htab
->non_lazy_plt
->plt_entry_size
);
4286 resolved_plt
= htab
->plt_second
;
4287 plt_offset
= eh
->plt_second
.offset
;
4292 plt_offset
= h
->plt
.offset
;
4295 /* Insert the relocation positions of the plt section. */
4297 /* Put offset the PC-relative instruction referring to the GOT entry,
4298 subtracting the size of that instruction. */
4299 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
4300 + gotplt
->output_offset
4302 - resolved_plt
->output_section
->vma
4303 - resolved_plt
->output_offset
4305 - htab
->plt
.plt_got_insn_size
);
4307 /* Check PC-relative offset overflow in PLT entry. */
4308 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
4309 /* xgettext:c-format */
4310 info
->callbacks
->einfo (_("%F%pB: PC-relative offset overflow in PLT entry for `%s'\n"),
4311 output_bfd
, h
->root
.root
.string
);
4313 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
4314 (resolved_plt
->contents
+ plt_offset
4315 + htab
->plt
.plt_got_offset
));
4317 /* Fill in the entry in the global offset table, initially this
4318 points to the second part of the PLT entry. Leave the entry
4319 as zero for undefined weak symbol in PIE. No PLT relocation
4320 against undefined weak symbol in PIE. */
4321 if (!local_undefweak
)
4323 if (htab
->plt
.has_plt0
)
4324 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4325 + plt
->output_offset
4327 + htab
->lazy_plt
->plt_lazy_offset
),
4328 gotplt
->contents
+ got_offset
);
4330 /* Fill in the entry in the .rela.plt section. */
4331 rela
.r_offset
= (gotplt
->output_section
->vma
4332 + gotplt
->output_offset
4334 if (PLT_LOCAL_IFUNC_P (info
, h
))
4336 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
4337 h
->root
.root
.string
,
4338 h
->root
.u
.def
.section
->owner
);
4340 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4341 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4342 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4343 rela
.r_addend
= (h
->root
.u
.def
.value
4344 + h
->root
.u
.def
.section
->output_section
->vma
4345 + h
->root
.u
.def
.section
->output_offset
);
4347 if (htab
->params
->report_relative_reloc
)
4348 _bfd_x86_elf_link_report_relative_reloc
4349 (info
, relplt
, h
, sym
, "R_X86_64_IRELATIVE", &rela
);
4351 /* R_X86_64_IRELATIVE comes last. */
4352 plt_index
= htab
->next_irelative_index
--;
4356 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4358 plt_index
= htab
->next_jump_slot_index
++;
4361 /* Don't fill the second and third slots in PLT entry for
4362 static executables nor without PLT0. */
4363 if (plt
== htab
->elf
.splt
&& htab
->plt
.has_plt0
)
4366 = h
->plt
.offset
+ htab
->lazy_plt
->plt_plt_insn_end
;
4368 /* Put relocation index. */
4369 bfd_put_32 (output_bfd
, plt_index
,
4370 (plt
->contents
+ h
->plt
.offset
4371 + htab
->lazy_plt
->plt_reloc_offset
));
4373 /* Put offset for jmp .PLT0 and check for overflow. We don't
4374 check relocation index for overflow since branch displacement
4375 will overflow first. */
4376 if (plt0_offset
> 0x80000000)
4377 /* xgettext:c-format */
4378 info
->callbacks
->einfo (_("%F%pB: branch displacement overflow in PLT entry for `%s'\n"),
4379 output_bfd
, h
->root
.root
.string
);
4380 bfd_put_32 (output_bfd
, - plt0_offset
,
4381 (plt
->contents
+ h
->plt
.offset
4382 + htab
->lazy_plt
->plt_plt_offset
));
4385 bed
= get_elf_backend_data (output_bfd
);
4386 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4387 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4390 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
4392 bfd_vma got_offset
, plt_offset
;
4393 asection
*plt
, *got
;
4395 int32_t got_pcrel_offset
;
4397 /* Set the entry in the GOT procedure linkage table. */
4398 plt
= htab
->plt_got
;
4399 got
= htab
->elf
.sgot
;
4400 got_offset
= h
->got
.offset
;
4402 if (got_offset
== (bfd_vma
) -1
4403 || (h
->type
== STT_GNU_IFUNC
&& h
->def_regular
)
4408 /* Use the non-lazy PLT entry template for the GOT PLT since they
4409 are the identical. */
4410 /* Fill in the entry in the GOT procedure linkage table. */
4411 plt_offset
= eh
->plt_got
.offset
;
4412 memcpy (plt
->contents
+ plt_offset
,
4413 htab
->non_lazy_plt
->plt_entry
,
4414 htab
->non_lazy_plt
->plt_entry_size
);
4416 /* Put offset the PC-relative instruction referring to the GOT
4417 entry, subtracting the size of that instruction. */
4418 got_pcrel_offset
= (got
->output_section
->vma
4419 + got
->output_offset
4421 - plt
->output_section
->vma
4422 - plt
->output_offset
4424 - htab
->non_lazy_plt
->plt_got_insn_size
);
4426 /* Check PC-relative offset overflow in GOT PLT entry. */
4427 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
4428 if ((got_after_plt
&& got_pcrel_offset
< 0)
4429 || (!got_after_plt
&& got_pcrel_offset
> 0))
4430 /* xgettext:c-format */
4431 info
->callbacks
->einfo (_("%F%pB: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
4432 output_bfd
, h
->root
.root
.string
);
4434 bfd_put_32 (output_bfd
, got_pcrel_offset
,
4435 (plt
->contents
+ plt_offset
4436 + htab
->non_lazy_plt
->plt_got_offset
));
4439 if (!local_undefweak
4441 && (h
->plt
.offset
!= (bfd_vma
) -1
4442 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
4444 /* Mark the symbol as undefined, rather than as defined in
4445 the .plt section. Leave the value if there were any
4446 relocations where pointer equality matters (this is a clue
4447 for the dynamic linker, to make function pointer
4448 comparisons work between an application and shared
4449 library), otherwise set it to zero. If a function is only
4450 called from a binary, there is no need to slow down
4451 shared libraries because of that. */
4452 sym
->st_shndx
= SHN_UNDEF
;
4453 if (!h
->pointer_equality_needed
)
4457 _bfd_x86_elf_link_fixup_ifunc_symbol (info
, htab
, h
, sym
);
4459 /* Don't generate dynamic GOT relocation against undefined weak
4460 symbol in executable. */
4461 if (h
->got
.offset
!= (bfd_vma
) -1
4462 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h
)->tls_type
)
4463 && elf_x86_hash_entry (h
)->tls_type
!= GOT_TLS_IE
4464 && !local_undefweak
)
4466 Elf_Internal_Rela rela
;
4467 asection
*relgot
= htab
->elf
.srelgot
;
4468 const char *relative_reloc_name
= NULL
;
4469 bool generate_dynamic_reloc
= true;
4471 /* This symbol has an entry in the global offset table. Set it
4473 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4476 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4477 + htab
->elf
.sgot
->output_offset
4478 + (h
->got
.offset
&~ (bfd_vma
) 1));
4480 /* If this is a static link, or it is a -Bsymbolic link and the
4481 symbol is defined locally or was forced to be local because
4482 of a version file, we just want to emit a RELATIVE reloc.
4483 The entry in the global offset table will already have been
4484 initialized in the relocate_section function. */
4486 && h
->type
== STT_GNU_IFUNC
)
4488 if (h
->plt
.offset
== (bfd_vma
) -1)
4490 /* STT_GNU_IFUNC is referenced without PLT. */
4491 if (htab
->elf
.splt
== NULL
)
4493 /* use .rel[a].iplt section to store .got relocations
4494 in static executable. */
4495 relgot
= htab
->elf
.irelplt
;
4497 if (SYMBOL_REFERENCES_LOCAL_P (info
, h
))
4499 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
4500 h
->root
.root
.string
,
4501 h
->root
.u
.def
.section
->owner
);
4503 rela
.r_info
= htab
->r_info (0,
4504 R_X86_64_IRELATIVE
);
4505 rela
.r_addend
= (h
->root
.u
.def
.value
4506 + h
->root
.u
.def
.section
->output_section
->vma
4507 + h
->root
.u
.def
.section
->output_offset
);
4508 relative_reloc_name
= "R_X86_64_IRELATIVE";
4513 else if (bfd_link_pic (info
))
4515 /* Generate R_X86_64_GLOB_DAT. */
4523 if (!h
->pointer_equality_needed
)
4526 /* For non-shared object, we can't use .got.plt, which
4527 contains the real function addres if we need pointer
4528 equality. We load the GOT entry with the PLT entry. */
4529 if (htab
->plt_second
!= NULL
)
4531 plt
= htab
->plt_second
;
4532 plt_offset
= eh
->plt_second
.offset
;
4536 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4537 plt_offset
= h
->plt
.offset
;
4539 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4540 + plt
->output_offset
4542 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4546 else if (bfd_link_pic (info
)
4547 && SYMBOL_REFERENCES_LOCAL_P (info
, h
))
4549 if (!SYMBOL_DEFINED_NON_SHARED_P (h
))
4551 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4552 if (info
->enable_dt_relr
)
4553 generate_dynamic_reloc
= false;
4556 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4557 rela
.r_addend
= (h
->root
.u
.def
.value
4558 + h
->root
.u
.def
.section
->output_section
->vma
4559 + h
->root
.u
.def
.section
->output_offset
);
4560 relative_reloc_name
= "R_X86_64_RELATIVE";
4565 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4567 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4568 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4569 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4573 if (generate_dynamic_reloc
)
4575 if (relative_reloc_name
!= NULL
4576 && htab
->params
->report_relative_reloc
)
4577 _bfd_x86_elf_link_report_relative_reloc
4578 (info
, relgot
, h
, sym
, relative_reloc_name
, &rela
);
4580 elf_append_rela (output_bfd
, relgot
, &rela
);
4586 Elf_Internal_Rela rela
;
4589 /* This symbol needs a copy reloc. Set it up. */
4590 VERIFY_COPY_RELOC (h
, htab
)
4592 rela
.r_offset
= (h
->root
.u
.def
.value
4593 + h
->root
.u
.def
.section
->output_section
->vma
4594 + h
->root
.u
.def
.section
->output_offset
);
4595 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4597 if (h
->root
.u
.def
.section
== htab
->elf
.sdynrelro
)
4598 s
= htab
->elf
.sreldynrelro
;
4600 s
= htab
->elf
.srelbss
;
4601 elf_append_rela (output_bfd
, s
, &rela
);
4607 /* Finish up local dynamic symbol handling. We set the contents of
4608 various dynamic sections here. */
4611 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4613 struct elf_link_hash_entry
*h
4614 = (struct elf_link_hash_entry
*) *slot
;
4615 struct bfd_link_info
*info
4616 = (struct bfd_link_info
*) inf
;
4618 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4622 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4623 here since undefined weak symbol may not be dynamic and may not be
4624 called for elf_x86_64_finish_dynamic_symbol. */
4627 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry
*bh
,
4630 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
4631 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
4633 if (h
->root
.type
!= bfd_link_hash_undefweak
4634 || h
->dynindx
!= -1)
4637 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4641 /* Used to decide how to sort relocs in an optimal manner for the
4642 dynamic linker, before writing them out. */
4644 static enum elf_reloc_type_class
4645 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
4646 const asection
*rel_sec ATTRIBUTE_UNUSED
,
4647 const Elf_Internal_Rela
*rela
)
4649 bfd
*abfd
= info
->output_bfd
;
4650 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4651 struct elf_x86_link_hash_table
*htab
4652 = elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4654 if (htab
->elf
.dynsym
!= NULL
4655 && htab
->elf
.dynsym
->contents
!= NULL
)
4657 /* Check relocation against STT_GNU_IFUNC symbol if there are
4659 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
4660 if (r_symndx
!= STN_UNDEF
)
4662 Elf_Internal_Sym sym
;
4663 if (!bed
->s
->swap_symbol_in (abfd
,
4664 (htab
->elf
.dynsym
->contents
4665 + r_symndx
* bed
->s
->sizeof_sym
),
4669 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
4670 return reloc_class_ifunc
;
4674 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4676 case R_X86_64_IRELATIVE
:
4677 return reloc_class_ifunc
;
4678 case R_X86_64_RELATIVE
:
4679 case R_X86_64_RELATIVE64
:
4680 return reloc_class_relative
;
4681 case R_X86_64_JUMP_SLOT
:
4682 return reloc_class_plt
;
4684 return reloc_class_copy
;
4686 return reloc_class_normal
;
4690 /* Finish up the dynamic sections. */
4693 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4694 struct bfd_link_info
*info
)
4696 struct elf_x86_link_hash_table
*htab
;
4698 htab
= _bfd_x86_elf_finish_dynamic_sections (output_bfd
, info
);
4702 if (! htab
->elf
.dynamic_sections_created
)
4705 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4707 if (bfd_is_abs_section (htab
->elf
.splt
->output_section
))
4709 info
->callbacks
->einfo
4710 (_("%F%P: discarded output section: `%pA'\n"),
4715 elf_section_data (htab
->elf
.splt
->output_section
)
4716 ->this_hdr
.sh_entsize
= htab
->plt
.plt_entry_size
;
4718 if (htab
->plt
.has_plt0
)
4720 /* Fill in the special first entry in the procedure linkage
4722 memcpy (htab
->elf
.splt
->contents
,
4723 htab
->lazy_plt
->plt0_entry
,
4724 htab
->lazy_plt
->plt0_entry_size
);
4725 /* Add offset for pushq GOT+8(%rip), since the instruction
4726 uses 6 bytes subtract this value. */
4727 bfd_put_32 (output_bfd
,
4728 (htab
->elf
.sgotplt
->output_section
->vma
4729 + htab
->elf
.sgotplt
->output_offset
4731 - htab
->elf
.splt
->output_section
->vma
4732 - htab
->elf
.splt
->output_offset
4734 (htab
->elf
.splt
->contents
4735 + htab
->lazy_plt
->plt0_got1_offset
));
4736 /* Add offset for the PC-relative instruction accessing
4737 GOT+16, subtracting the offset to the end of that
4739 bfd_put_32 (output_bfd
,
4740 (htab
->elf
.sgotplt
->output_section
->vma
4741 + htab
->elf
.sgotplt
->output_offset
4743 - htab
->elf
.splt
->output_section
->vma
4744 - htab
->elf
.splt
->output_offset
4745 - htab
->lazy_plt
->plt0_got2_insn_end
),
4746 (htab
->elf
.splt
->contents
4747 + htab
->lazy_plt
->plt0_got2_offset
));
4750 if (htab
->elf
.tlsdesc_plt
)
4752 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4753 htab
->elf
.sgot
->contents
+ htab
->elf
.tlsdesc_got
);
4755 memcpy (htab
->elf
.splt
->contents
+ htab
->elf
.tlsdesc_plt
,
4756 htab
->lazy_plt
->plt_tlsdesc_entry
,
4757 htab
->lazy_plt
->plt_tlsdesc_entry_size
);
4759 /* Add offset for pushq GOT+8(%rip), since ENDBR64 uses 4
4760 bytes and the instruction uses 6 bytes, subtract these
4762 bfd_put_32 (output_bfd
,
4763 (htab
->elf
.sgotplt
->output_section
->vma
4764 + htab
->elf
.sgotplt
->output_offset
4766 - htab
->elf
.splt
->output_section
->vma
4767 - htab
->elf
.splt
->output_offset
4768 - htab
->elf
.tlsdesc_plt
4769 - htab
->lazy_plt
->plt_tlsdesc_got1_insn_end
),
4770 (htab
->elf
.splt
->contents
4771 + htab
->elf
.tlsdesc_plt
4772 + htab
->lazy_plt
->plt_tlsdesc_got1_offset
));
4773 /* Add offset for indirect branch via GOT+TDG, where TDG
4774 stands for htab->tlsdesc_got, subtracting the offset
4775 to the end of that instruction. */
4776 bfd_put_32 (output_bfd
,
4777 (htab
->elf
.sgot
->output_section
->vma
4778 + htab
->elf
.sgot
->output_offset
4779 + htab
->elf
.tlsdesc_got
4780 - htab
->elf
.splt
->output_section
->vma
4781 - htab
->elf
.splt
->output_offset
4782 - htab
->elf
.tlsdesc_plt
4783 - htab
->lazy_plt
->plt_tlsdesc_got2_insn_end
),
4784 (htab
->elf
.splt
->contents
4785 + htab
->elf
.tlsdesc_plt
4786 + htab
->lazy_plt
->plt_tlsdesc_got2_offset
));
4790 /* Fill PLT entries for undefined weak symbols in PIE. */
4791 if (bfd_link_pie (info
))
4792 bfd_hash_traverse (&info
->hash
->table
,
4793 elf_x86_64_pie_finish_undefweak_symbol
,
4799 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4800 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4801 It has to be done before elf_link_sort_relocs is called so that
4802 dynamic relocations are properly sorted. */
4805 elf_x86_64_output_arch_local_syms
4806 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
4807 struct bfd_link_info
*info
,
4808 void *flaginfo ATTRIBUTE_UNUSED
,
4809 int (*func
) (void *, const char *,
4812 struct elf_link_hash_entry
*) ATTRIBUTE_UNUSED
)
4814 struct elf_x86_link_hash_table
*htab
4815 = elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4819 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4820 htab_traverse (htab
->loc_hash_table
,
4821 elf_x86_64_finish_local_dynamic_symbol
,
4827 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4828 dynamic relocations. */
4831 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
4832 long symcount ATTRIBUTE_UNUSED
,
4833 asymbol
**syms ATTRIBUTE_UNUSED
,
4840 bfd_byte
*plt_contents
;
4842 const struct elf_x86_lazy_plt_layout
*lazy_plt
;
4843 const struct elf_x86_non_lazy_plt_layout
*non_lazy_plt
;
4844 const struct elf_x86_lazy_plt_layout
*lazy_bnd_plt
;
4845 const struct elf_x86_non_lazy_plt_layout
*non_lazy_bnd_plt
;
4846 const struct elf_x86_lazy_plt_layout
*lazy_ibt_plt
;
4847 const struct elf_x86_non_lazy_plt_layout
*non_lazy_ibt_plt
;
4849 enum elf_x86_plt_type plt_type
;
4850 struct elf_x86_plt plts
[] =
4852 { ".plt", NULL
, NULL
, plt_unknown
, 0, 0, 0, 0 },
4853 { ".plt.got", NULL
, NULL
, plt_non_lazy
, 0, 0, 0, 0 },
4854 { ".plt.sec", NULL
, NULL
, plt_second
, 0, 0, 0, 0 },
4855 { ".plt.bnd", NULL
, NULL
, plt_second
, 0, 0, 0, 0 },
4856 { NULL
, NULL
, NULL
, plt_non_lazy
, 0, 0, 0, 0 }
4861 if ((abfd
->flags
& (DYNAMIC
| EXEC_P
)) == 0)
4864 if (dynsymcount
<= 0)
4867 relsize
= bfd_get_dynamic_reloc_upper_bound (abfd
);
4871 lazy_plt
= &elf_x86_64_lazy_plt
;
4872 non_lazy_plt
= &elf_x86_64_non_lazy_plt
;
4873 lazy_bnd_plt
= &elf_x86_64_lazy_bnd_plt
;
4874 non_lazy_bnd_plt
= &elf_x86_64_non_lazy_bnd_plt
;
4875 if (ABI_64_P (abfd
))
4877 lazy_ibt_plt
= &elf_x86_64_lazy_ibt_plt
;
4878 non_lazy_ibt_plt
= &elf_x86_64_non_lazy_ibt_plt
;
4882 lazy_ibt_plt
= &elf_x32_lazy_ibt_plt
;
4883 non_lazy_ibt_plt
= &elf_x32_non_lazy_ibt_plt
;
4887 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
4889 plt
= bfd_get_section_by_name (abfd
, plts
[j
].name
);
4890 if (plt
== NULL
|| plt
->size
== 0)
4893 /* Get the PLT section contents. */
4894 if (!bfd_malloc_and_get_section (abfd
, plt
, &plt_contents
))
4897 /* Check what kind of PLT it is. */
4898 plt_type
= plt_unknown
;
4899 if (plts
[j
].type
== plt_unknown
4900 && (plt
->size
>= (lazy_plt
->plt_entry_size
4901 + lazy_plt
->plt_entry_size
)))
4903 /* Match lazy PLT first. Need to check the first two
4905 if ((memcmp (plt_contents
, lazy_plt
->plt0_entry
,
4906 lazy_plt
->plt0_got1_offset
) == 0)
4907 && (memcmp (plt_contents
+ 6, lazy_plt
->plt0_entry
+ 6,
4909 plt_type
= plt_lazy
;
4910 else if (lazy_bnd_plt
!= NULL
4911 && (memcmp (plt_contents
, lazy_bnd_plt
->plt0_entry
,
4912 lazy_bnd_plt
->plt0_got1_offset
) == 0)
4913 && (memcmp (plt_contents
+ 6,
4914 lazy_bnd_plt
->plt0_entry
+ 6, 3) == 0))
4916 plt_type
= plt_lazy
| plt_second
;
4917 /* The fist entry in the lazy IBT PLT is the same as the
4919 if ((memcmp (plt_contents
+ lazy_ibt_plt
->plt_entry_size
,
4920 lazy_ibt_plt
->plt_entry
,
4921 lazy_ibt_plt
->plt_got_offset
) == 0))
4922 lazy_plt
= lazy_ibt_plt
;
4924 lazy_plt
= lazy_bnd_plt
;
4928 if (non_lazy_plt
!= NULL
4929 && (plt_type
== plt_unknown
|| plt_type
== plt_non_lazy
)
4930 && plt
->size
>= non_lazy_plt
->plt_entry_size
)
4932 /* Match non-lazy PLT. */
4933 if (memcmp (plt_contents
, non_lazy_plt
->plt_entry
,
4934 non_lazy_plt
->plt_got_offset
) == 0)
4935 plt_type
= plt_non_lazy
;
4938 if (plt_type
== plt_unknown
|| plt_type
== plt_second
)
4940 if (non_lazy_bnd_plt
!= NULL
4941 && plt
->size
>= non_lazy_bnd_plt
->plt_entry_size
4942 && (memcmp (plt_contents
, non_lazy_bnd_plt
->plt_entry
,
4943 non_lazy_bnd_plt
->plt_got_offset
) == 0))
4945 /* Match BND PLT. */
4946 plt_type
= plt_second
;
4947 non_lazy_plt
= non_lazy_bnd_plt
;
4949 else if (non_lazy_ibt_plt
!= NULL
4950 && plt
->size
>= non_lazy_ibt_plt
->plt_entry_size
4951 && (memcmp (plt_contents
,
4952 non_lazy_ibt_plt
->plt_entry
,
4953 non_lazy_ibt_plt
->plt_got_offset
) == 0))
4955 /* Match IBT PLT. */
4956 plt_type
= plt_second
;
4957 non_lazy_plt
= non_lazy_ibt_plt
;
4961 if (plt_type
== plt_unknown
)
4963 free (plt_contents
);
4968 plts
[j
].type
= plt_type
;
4970 if ((plt_type
& plt_lazy
))
4972 plts
[j
].plt_got_offset
= lazy_plt
->plt_got_offset
;
4973 plts
[j
].plt_got_insn_size
= lazy_plt
->plt_got_insn_size
;
4974 plts
[j
].plt_entry_size
= lazy_plt
->plt_entry_size
;
4975 /* Skip PLT0 in lazy PLT. */
4980 plts
[j
].plt_got_offset
= non_lazy_plt
->plt_got_offset
;
4981 plts
[j
].plt_got_insn_size
= non_lazy_plt
->plt_got_insn_size
;
4982 plts
[j
].plt_entry_size
= non_lazy_plt
->plt_entry_size
;
4986 /* Skip lazy PLT when the second PLT is used. */
4987 if (plt_type
== (plt_lazy
| plt_second
))
4991 n
= plt
->size
/ plts
[j
].plt_entry_size
;
4996 plts
[j
].contents
= plt_contents
;
4999 return _bfd_x86_elf_get_synthetic_symtab (abfd
, count
, relsize
,
5000 (bfd_vma
) 0, plts
, dynsyms
,
5004 /* Handle an x86-64 specific section when reading an object file. This
5005 is called when elfcode.h finds a section with an unknown type. */
5008 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
5009 const char *name
, int shindex
)
5011 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
5014 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
5020 /* Hook called by the linker routine which adds symbols from an object
5021 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5025 elf_x86_64_add_symbol_hook (bfd
*abfd
,
5026 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5027 Elf_Internal_Sym
*sym
,
5028 const char **namep ATTRIBUTE_UNUSED
,
5029 flagword
*flagsp ATTRIBUTE_UNUSED
,
5035 switch (sym
->st_shndx
)
5037 case SHN_X86_64_LCOMMON
:
5038 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
5041 lcomm
= bfd_make_section_with_flags (abfd
,
5045 | SEC_LINKER_CREATED
));
5048 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
5051 *valp
= sym
->st_size
;
5059 /* Given a BFD section, try to locate the corresponding ELF section
5063 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
5064 asection
*sec
, int *index_return
)
5066 if (sec
== &_bfd_elf_large_com_section
)
5068 *index_return
= SHN_X86_64_LCOMMON
;
5074 /* Process a symbol. */
5077 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
5080 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
5082 switch (elfsym
->internal_elf_sym
.st_shndx
)
5084 case SHN_X86_64_LCOMMON
:
5085 asym
->section
= &_bfd_elf_large_com_section
;
5086 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
5087 /* Common symbol doesn't set BSF_GLOBAL. */
5088 asym
->flags
&= ~BSF_GLOBAL
;
5094 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
5096 return (sym
->st_shndx
== SHN_COMMON
5097 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
5101 elf_x86_64_common_section_index (asection
*sec
)
5103 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5106 return SHN_X86_64_LCOMMON
;
5110 elf_x86_64_common_section (asection
*sec
)
5112 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5113 return bfd_com_section_ptr
;
5115 return &_bfd_elf_large_com_section
;
5119 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
5120 const Elf_Internal_Sym
*sym
,
5125 const asection
*oldsec
)
5127 /* A normal common symbol and a large common symbol result in a
5128 normal common symbol. We turn the large common symbol into a
5131 && h
->root
.type
== bfd_link_hash_common
5133 && bfd_is_com_section (*psec
)
5136 if (sym
->st_shndx
== SHN_COMMON
5137 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
5139 h
->root
.u
.c
.p
->section
5140 = bfd_make_section_old_way (oldbfd
, "COMMON");
5141 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
5143 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
5144 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
5145 *psec
= bfd_com_section_ptr
;
5152 elf_x86_64_additional_program_headers (bfd
*abfd
,
5153 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
5158 /* Check to see if we need a large readonly segment. */
5159 s
= bfd_get_section_by_name (abfd
, ".lrodata");
5160 if (s
&& (s
->flags
& SEC_LOAD
))
5163 /* Check to see if we need a large data segment. Since .lbss sections
5164 is placed right after the .bss section, there should be no need for
5165 a large data segment just because of .lbss. */
5166 s
= bfd_get_section_by_name (abfd
, ".ldata");
5167 if (s
&& (s
->flags
& SEC_LOAD
))
5173 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5176 elf_x86_64_relocs_compatible (const bfd_target
*input
,
5177 const bfd_target
*output
)
5179 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
5180 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
5181 && _bfd_elf_relocs_compatible (input
, output
));
5184 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
5185 with GNU properties if found. Otherwise, return NULL. */
5188 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info
*info
)
5190 struct elf_x86_init_table init_table
;
5191 const struct elf_backend_data
*bed
;
5192 struct elf_x86_link_hash_table
*htab
;
5194 if ((int) R_X86_64_standard
>= (int) R_X86_64_converted_reloc_bit
5195 || (int) R_X86_64_max
<= (int) R_X86_64_converted_reloc_bit
5196 || ((int) (R_X86_64_GNU_VTINHERIT
| R_X86_64_converted_reloc_bit
)
5197 != (int) R_X86_64_GNU_VTINHERIT
)
5198 || ((int) (R_X86_64_GNU_VTENTRY
| R_X86_64_converted_reloc_bit
)
5199 != (int) R_X86_64_GNU_VTENTRY
))
5202 /* This is unused for x86-64. */
5203 init_table
.plt0_pad_byte
= 0x90;
5205 bed
= get_elf_backend_data (info
->output_bfd
);
5206 htab
= elf_x86_hash_table (info
, bed
->target_id
);
5209 if (htab
->params
->bndplt
)
5211 init_table
.lazy_plt
= &elf_x86_64_lazy_bnd_plt
;
5212 init_table
.non_lazy_plt
= &elf_x86_64_non_lazy_bnd_plt
;
5216 init_table
.lazy_plt
= &elf_x86_64_lazy_plt
;
5217 init_table
.non_lazy_plt
= &elf_x86_64_non_lazy_plt
;
5220 if (ABI_64_P (info
->output_bfd
))
5222 init_table
.lazy_ibt_plt
= &elf_x86_64_lazy_ibt_plt
;
5223 init_table
.non_lazy_ibt_plt
= &elf_x86_64_non_lazy_ibt_plt
;
5227 init_table
.lazy_ibt_plt
= &elf_x32_lazy_ibt_plt
;
5228 init_table
.non_lazy_ibt_plt
= &elf_x32_non_lazy_ibt_plt
;
5231 if (ABI_64_P (info
->output_bfd
))
5233 init_table
.r_info
= elf64_r_info
;
5234 init_table
.r_sym
= elf64_r_sym
;
5238 init_table
.r_info
= elf32_r_info
;
5239 init_table
.r_sym
= elf32_r_sym
;
5242 return _bfd_x86_elf_link_setup_gnu_properties (info
, &init_table
);
5245 static const struct bfd_elf_special_section
5246 elf_x86_64_special_sections
[]=
5248 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5249 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5250 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
5251 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5252 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5253 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5254 { NULL
, 0, 0, 0, 0 }
5257 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5258 #define TARGET_LITTLE_NAME "elf64-x86-64"
5259 #define ELF_ARCH bfd_arch_i386
5260 #define ELF_TARGET_ID X86_64_ELF_DATA
5261 #define ELF_MACHINE_CODE EM_X86_64
5262 #if DEFAULT_LD_Z_SEPARATE_CODE
5263 # define ELF_MAXPAGESIZE 0x1000
5265 # define ELF_MAXPAGESIZE 0x200000
5267 #define ELF_COMMONPAGESIZE 0x1000
5269 #define elf_backend_can_gc_sections 1
5270 #define elf_backend_can_refcount 1
5271 #define elf_backend_want_got_plt 1
5272 #define elf_backend_plt_readonly 1
5273 #define elf_backend_want_plt_sym 0
5274 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5275 #define elf_backend_rela_normal 1
5276 #define elf_backend_plt_alignment 4
5277 #define elf_backend_caches_rawsize 1
5278 #define elf_backend_dtrel_excludes_plt 1
5279 #define elf_backend_want_dynrelro 1
5281 #define elf_info_to_howto elf_x86_64_info_to_howto
5283 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5284 #define bfd_elf64_bfd_reloc_name_lookup \
5285 elf_x86_64_reloc_name_lookup
5287 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5288 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5289 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
5290 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5291 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5292 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
5293 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5294 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5296 #define elf_backend_write_core_note elf_x86_64_write_core_note
5298 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5299 #define elf_backend_relocate_section elf_x86_64_relocate_section
5300 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5301 #define elf_backend_object_p elf64_x86_64_elf_object_p
5302 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5304 #define elf_backend_section_from_shdr \
5305 elf_x86_64_section_from_shdr
5307 #define elf_backend_section_from_bfd_section \
5308 elf_x86_64_elf_section_from_bfd_section
5309 #define elf_backend_add_symbol_hook \
5310 elf_x86_64_add_symbol_hook
5311 #define elf_backend_symbol_processing \
5312 elf_x86_64_symbol_processing
5313 #define elf_backend_common_section_index \
5314 elf_x86_64_common_section_index
5315 #define elf_backend_common_section \
5316 elf_x86_64_common_section
5317 #define elf_backend_common_definition \
5318 elf_x86_64_common_definition
5319 #define elf_backend_merge_symbol \
5320 elf_x86_64_merge_symbol
5321 #define elf_backend_special_sections \
5322 elf_x86_64_special_sections
5323 #define elf_backend_additional_program_headers \
5324 elf_x86_64_additional_program_headers
5325 #define elf_backend_setup_gnu_properties \
5326 elf_x86_64_link_setup_gnu_properties
5327 #define elf_backend_hide_symbol \
5328 _bfd_x86_elf_hide_symbol
5331 #define elf64_bed elf64_x86_64_bed
5333 #include "elf64-target.h"
5335 /* CloudABI support. */
5337 #undef TARGET_LITTLE_SYM
5338 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
5339 #undef TARGET_LITTLE_NAME
5340 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
5343 #define ELF_OSABI ELFOSABI_CLOUDABI
5346 #define elf64_bed elf64_x86_64_cloudabi_bed
5348 #include "elf64-target.h"
5350 /* FreeBSD support. */
5352 #undef TARGET_LITTLE_SYM
5353 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5354 #undef TARGET_LITTLE_NAME
5355 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5358 #define ELF_OSABI ELFOSABI_FREEBSD
5361 #define elf64_bed elf64_x86_64_fbsd_bed
5363 #include "elf64-target.h"
5365 /* Solaris 2 support. */
5367 #undef TARGET_LITTLE_SYM
5368 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5369 #undef TARGET_LITTLE_NAME
5370 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5372 #undef ELF_TARGET_OS
5373 #define ELF_TARGET_OS is_solaris
5375 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5376 objects won't be recognized. */
5380 #define elf64_bed elf64_x86_64_sol2_bed
5382 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5384 #undef elf_backend_static_tls_alignment
5385 #define elf_backend_static_tls_alignment 16
5387 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5389 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5391 #undef elf_backend_want_plt_sym
5392 #define elf_backend_want_plt_sym 1
5394 #undef elf_backend_strtab_flags
5395 #define elf_backend_strtab_flags SHF_STRINGS
5398 elf64_x86_64_copy_solaris_special_section_fields (const bfd
*ibfd ATTRIBUTE_UNUSED
,
5399 bfd
*obfd ATTRIBUTE_UNUSED
,
5400 const Elf_Internal_Shdr
*isection ATTRIBUTE_UNUSED
,
5401 Elf_Internal_Shdr
*osection ATTRIBUTE_UNUSED
)
5403 /* PR 19938: FIXME: Need to add code for setting the sh_info
5404 and sh_link fields of Solaris specific section types. */
5408 #undef elf_backend_copy_special_section_fields
5409 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
5411 #include "elf64-target.h"
5413 /* Restore defaults. */
5415 #undef elf_backend_static_tls_alignment
5416 #undef elf_backend_want_plt_sym
5417 #define elf_backend_want_plt_sym 0
5418 #undef elf_backend_strtab_flags
5419 #undef elf_backend_copy_special_section_fields
5421 /* 32bit x86-64 support. */
5423 #undef TARGET_LITTLE_SYM
5424 #define TARGET_LITTLE_SYM x86_64_elf32_vec
5425 #undef TARGET_LITTLE_NAME
5426 #define TARGET_LITTLE_NAME "elf32-x86-64"
5428 #define elf32_bed elf32_x86_64_bed
5431 #define ELF_ARCH bfd_arch_i386
5433 #undef ELF_MACHINE_CODE
5434 #define ELF_MACHINE_CODE EM_X86_64
5436 #undef ELF_TARGET_OS
5439 #define bfd_elf32_bfd_reloc_type_lookup \
5440 elf_x86_64_reloc_type_lookup
5441 #define bfd_elf32_bfd_reloc_name_lookup \
5442 elf_x86_64_reloc_name_lookup
5443 #define bfd_elf32_get_synthetic_symtab \
5444 elf_x86_64_get_synthetic_symtab
5446 #undef elf_backend_object_p
5447 #define elf_backend_object_p \
5448 elf32_x86_64_elf_object_p
5450 #undef elf_backend_bfd_from_remote_memory
5451 #define elf_backend_bfd_from_remote_memory \
5452 _bfd_elf32_bfd_from_remote_memory
5454 #undef elf_backend_size_info
5455 #define elf_backend_size_info \
5456 _bfd_elf32_size_info
5458 #include "elf32-target.h"