1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2017 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "opcode/i386.h"
35 #include "elf/x86-64.h"
42 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
43 #define MINUS_ONE (~ (bfd_vma) 0)
45 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
46 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
47 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
48 since they are the same. */
50 #define ABI_64_P(abfd) \
51 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
53 /* The relocation "howto" table. Order of fields:
54 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
55 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
56 static reloc_howto_type x86_64_elf_howto_table
[] =
58 HOWTO(R_X86_64_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
59 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
61 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
64 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
65 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
67 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
68 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
70 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
71 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
73 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
74 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
76 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
77 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
79 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
80 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
82 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
85 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
86 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
88 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
89 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
91 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
92 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
94 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
96 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
97 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
98 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
99 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
100 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
101 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
102 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
103 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
105 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
106 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
108 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
109 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
111 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
112 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
114 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
115 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
117 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
118 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
120 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
121 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
123 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
124 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
126 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
127 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
129 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
130 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
131 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
132 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
133 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
134 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
135 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
136 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
138 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
139 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
141 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
142 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
143 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
144 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
145 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
147 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
148 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
150 HOWTO(R_X86_64_SIZE32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
151 bfd_elf_generic_reloc
, "R_X86_64_SIZE32", FALSE
, 0xffffffff, 0xffffffff,
153 HOWTO(R_X86_64_SIZE64
, 0, 4, 64, FALSE
, 0, complain_overflow_unsigned
,
154 bfd_elf_generic_reloc
, "R_X86_64_SIZE64", FALSE
, MINUS_ONE
, MINUS_ONE
,
156 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
157 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
158 "R_X86_64_GOTPC32_TLSDESC",
159 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
160 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
161 complain_overflow_dont
, bfd_elf_generic_reloc
,
162 "R_X86_64_TLSDESC_CALL",
164 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
165 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
167 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
168 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
169 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
171 HOWTO(R_X86_64_RELATIVE64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
172 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE64", FALSE
, MINUS_ONE
,
174 HOWTO(R_X86_64_PC32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
175 bfd_elf_generic_reloc
, "R_X86_64_PC32_BND", FALSE
, 0xffffffff, 0xffffffff,
177 HOWTO(R_X86_64_PLT32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
178 bfd_elf_generic_reloc
, "R_X86_64_PLT32_BND", FALSE
, 0xffffffff, 0xffffffff,
180 HOWTO(R_X86_64_GOTPCRELX
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
181 bfd_elf_generic_reloc
, "R_X86_64_GOTPCRELX", FALSE
, 0xffffffff,
183 HOWTO(R_X86_64_REX_GOTPCRELX
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
184 bfd_elf_generic_reloc
, "R_X86_64_REX_GOTPCRELX", FALSE
, 0xffffffff,
187 /* We have a gap in the reloc numbers here.
188 R_X86_64_standard counts the number up to this point, and
189 R_X86_64_vt_offset is the value to subtract from a reloc type of
190 R_X86_64_GNU_VT* to form an index into this table. */
191 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
192 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
194 /* GNU extension to record C++ vtable hierarchy. */
195 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
196 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
198 /* GNU extension to record C++ vtable member usage. */
199 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
200 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
203 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
204 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
205 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
209 #define IS_X86_64_PCREL_TYPE(TYPE) \
210 ( ((TYPE) == R_X86_64_PC8) \
211 || ((TYPE) == R_X86_64_PC16) \
212 || ((TYPE) == R_X86_64_PC32) \
213 || ((TYPE) == R_X86_64_PC32_BND) \
214 || ((TYPE) == R_X86_64_PC64))
216 /* Map BFD relocs to the x86_64 elf relocs. */
219 bfd_reloc_code_real_type bfd_reloc_val
;
220 unsigned char elf_reloc_val
;
223 static const struct elf_reloc_map x86_64_reloc_map
[] =
225 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
226 { BFD_RELOC_64
, R_X86_64_64
, },
227 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
228 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
229 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
230 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
231 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
232 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
233 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
234 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
235 { BFD_RELOC_32
, R_X86_64_32
, },
236 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
237 { BFD_RELOC_16
, R_X86_64_16
, },
238 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
239 { BFD_RELOC_8
, R_X86_64_8
, },
240 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
241 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
242 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
243 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
244 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
245 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
246 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
247 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
248 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
249 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
250 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
251 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
252 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
253 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
254 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
255 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
256 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
257 { BFD_RELOC_SIZE32
, R_X86_64_SIZE32
, },
258 { BFD_RELOC_SIZE64
, R_X86_64_SIZE64
, },
259 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
260 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
261 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
262 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
263 { BFD_RELOC_X86_64_PC32_BND
, R_X86_64_PC32_BND
, },
264 { BFD_RELOC_X86_64_PLT32_BND
, R_X86_64_PLT32_BND
, },
265 { BFD_RELOC_X86_64_GOTPCRELX
, R_X86_64_GOTPCRELX
, },
266 { BFD_RELOC_X86_64_REX_GOTPCRELX
, R_X86_64_REX_GOTPCRELX
, },
267 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
268 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
271 static reloc_howto_type
*
272 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
276 if (r_type
== (unsigned int) R_X86_64_32
)
281 i
= ARRAY_SIZE (x86_64_elf_howto_table
) - 1;
283 else if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
284 || r_type
>= (unsigned int) R_X86_64_max
)
286 if (r_type
>= (unsigned int) R_X86_64_standard
)
288 /* xgettext:c-format */
289 _bfd_error_handler (_("%B: invalid relocation type %d"),
291 r_type
= R_X86_64_NONE
;
296 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
297 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
298 return &x86_64_elf_howto_table
[i
];
301 /* Given a BFD reloc type, return a HOWTO structure. */
302 static reloc_howto_type
*
303 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
304 bfd_reloc_code_real_type code
)
308 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
311 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
312 return elf_x86_64_rtype_to_howto (abfd
,
313 x86_64_reloc_map
[i
].elf_reloc_val
);
318 static reloc_howto_type
*
319 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
324 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
326 /* Get x32 R_X86_64_32. */
327 reloc_howto_type
*reloc
328 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
329 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
333 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
334 if (x86_64_elf_howto_table
[i
].name
!= NULL
335 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
336 return &x86_64_elf_howto_table
[i
];
341 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
344 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
345 Elf_Internal_Rela
*dst
)
349 r_type
= ELF32_R_TYPE (dst
->r_info
);
350 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
351 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
354 /* Support for core dump NOTE sections. */
356 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
361 switch (note
->descsz
)
366 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
368 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
371 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
379 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
381 elf_tdata (abfd
)->core
->signal
382 = bfd_get_16 (abfd
, note
->descdata
+ 12);
385 elf_tdata (abfd
)->core
->lwpid
386 = bfd_get_32 (abfd
, note
->descdata
+ 32);
395 /* Make a ".reg/999" section. */
396 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
397 size
, note
->descpos
+ offset
);
401 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
403 switch (note
->descsz
)
408 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
409 elf_tdata (abfd
)->core
->pid
410 = bfd_get_32 (abfd
, note
->descdata
+ 12);
411 elf_tdata (abfd
)->core
->program
412 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
413 elf_tdata (abfd
)->core
->command
414 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
417 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
418 elf_tdata (abfd
)->core
->pid
419 = bfd_get_32 (abfd
, note
->descdata
+ 24);
420 elf_tdata (abfd
)->core
->program
421 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
422 elf_tdata (abfd
)->core
->command
423 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
426 /* Note that for some reason, a spurious space is tacked
427 onto the end of the args in some (at least one anyway)
428 implementations, so strip it off if it exists. */
431 char *command
= elf_tdata (abfd
)->core
->command
;
432 int n
= strlen (command
);
434 if (0 < n
&& command
[n
- 1] == ' ')
435 command
[n
- 1] = '\0';
443 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
446 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
448 const char *fname
, *psargs
;
459 va_start (ap
, note_type
);
460 fname
= va_arg (ap
, const char *);
461 psargs
= va_arg (ap
, const char *);
464 if (bed
->s
->elfclass
== ELFCLASS32
)
467 memset (&data
, 0, sizeof (data
));
468 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
469 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
470 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
471 &data
, sizeof (data
));
476 memset (&data
, 0, sizeof (data
));
477 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
478 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
479 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
480 &data
, sizeof (data
));
485 va_start (ap
, note_type
);
486 pid
= va_arg (ap
, long);
487 cursig
= va_arg (ap
, int);
488 gregs
= va_arg (ap
, const void *);
491 if (bed
->s
->elfclass
== ELFCLASS32
)
493 if (bed
->elf_machine_code
== EM_X86_64
)
495 prstatusx32_t prstat
;
496 memset (&prstat
, 0, sizeof (prstat
));
498 prstat
.pr_cursig
= cursig
;
499 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
500 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
501 &prstat
, sizeof (prstat
));
506 memset (&prstat
, 0, sizeof (prstat
));
508 prstat
.pr_cursig
= cursig
;
509 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
510 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
511 &prstat
, sizeof (prstat
));
517 memset (&prstat
, 0, sizeof (prstat
));
519 prstat
.pr_cursig
= cursig
;
520 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
521 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
522 &prstat
, sizeof (prstat
));
529 /* Functions for the x86-64 ELF linker. */
531 /* The name of the dynamic interpreter. This is put in the .interp
534 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
535 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
541 #define ELIMINATE_COPY_RELOCS 1
543 /* The size in bytes of an entry in the global offset table. */
545 #define GOT_ENTRY_SIZE 8
547 /* The size in bytes of an entry in the procedure linkage table. */
549 #define PLT_ENTRY_SIZE 16
551 /* The first entry in a procedure linkage table looks like this. See the
552 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
554 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
556 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
557 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
558 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
561 /* Subsequent entries in a procedure linkage table look like this. */
563 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
565 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
566 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
567 0x68, /* pushq immediate */
568 0, 0, 0, 0, /* replaced with index into relocation table. */
569 0xe9, /* jmp relative */
570 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
573 /* The first entry in a procedure linkage table with BND relocations
576 static const bfd_byte elf_x86_64_bnd_plt0_entry
[PLT_ENTRY_SIZE
] =
578 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
579 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
580 0x0f, 0x1f, 0 /* nopl (%rax) */
583 /* Subsequent entries for legacy branches in a procedure linkage table
584 with BND relocations look like this. */
586 static const bfd_byte elf_x86_64_legacy_plt_entry
[PLT_ENTRY_SIZE
] =
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xe9, 0, 0, 0, 0, /* jmpq relative */
590 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
593 /* Subsequent entries for branches with BND prefx in a procedure linkage
594 table with BND relocations look like this. */
596 static const bfd_byte elf_x86_64_bnd_plt_entry
[PLT_ENTRY_SIZE
] =
598 0x68, 0, 0, 0, 0, /* pushq immediate */
599 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
600 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
603 /* Entries for legacy branches in the second procedure linkage table
606 static const bfd_byte elf_x86_64_legacy_plt2_entry
[8] =
608 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
610 0x66, 0x90 /* xchg %ax,%ax */
613 /* Entries for branches with BND prefix in the second procedure linkage
614 table look like this. */
616 static const bfd_byte elf_x86_64_bnd_plt2_entry
[8] =
618 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
619 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
623 /* .eh_frame covering the .plt section. */
625 static const bfd_byte elf_x86_64_eh_frame_plt
[] =
627 #define PLT_CIE_LENGTH 20
628 #define PLT_FDE_LENGTH 36
629 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
630 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
631 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
632 0, 0, 0, 0, /* CIE ID */
634 'z', 'R', 0, /* Augmentation string */
635 1, /* Code alignment factor */
636 0x78, /* Data alignment factor */
637 16, /* Return address column */
638 1, /* Augmentation size */
639 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
640 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
641 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
642 DW_CFA_nop
, DW_CFA_nop
,
644 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
645 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
646 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
647 0, 0, 0, 0, /* .plt size goes here */
648 0, /* Augmentation size */
649 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
650 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
651 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
652 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
653 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
654 11, /* Block length */
655 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
656 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
657 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
658 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
659 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
662 /* .eh_frame covering the BND .plt section. */
664 static const bfd_byte elf_x86_64_eh_frame_bnd_plt
[] =
666 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
667 0, 0, 0, 0, /* CIE ID */
669 'z', 'R', 0, /* Augmentation string */
670 1, /* Code alignment factor */
671 0x78, /* Data alignment factor */
672 16, /* Return address column */
673 1, /* Augmentation size */
674 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
675 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
676 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
677 DW_CFA_nop
, DW_CFA_nop
,
679 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
680 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
681 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
682 0, 0, 0, 0, /* .plt size goes here */
683 0, /* Augmentation size */
684 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
685 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
686 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
687 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
688 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
689 11, /* Block length */
690 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
691 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
692 DW_OP_lit15
, DW_OP_and
, DW_OP_lit5
, DW_OP_ge
,
693 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
694 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
697 /* .eh_frame covering the .plt.got section. */
699 static const bfd_byte elf_x86_64_eh_frame_plt_got
[] =
701 #define PLT_GOT_FDE_LENGTH 20
702 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
703 0, 0, 0, 0, /* CIE ID */
705 'z', 'R', 0, /* Augmentation string */
706 1, /* Code alignment factor */
707 0x78, /* Data alignment factor */
708 16, /* Return address column */
709 1, /* Augmentation size */
710 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
711 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
712 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
713 DW_CFA_nop
, DW_CFA_nop
,
715 PLT_GOT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
716 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
717 0, 0, 0, 0, /* the start of .plt.got goes here */
718 0, 0, 0, 0, /* .plt.got size goes here */
719 0, /* Augmentation size */
720 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
,
721 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
724 /* Architecture-specific backend data for x86-64. */
726 struct elf_x86_64_backend_data
728 /* Templates for the initial PLT entry and for subsequent entries. */
729 const bfd_byte
*plt0_entry
;
730 const bfd_byte
*plt_entry
;
731 unsigned int plt_entry_size
; /* Size of each PLT entry. */
733 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
734 unsigned int plt0_got1_offset
;
735 unsigned int plt0_got2_offset
;
737 /* Offset of the end of the PC-relative instruction containing
739 unsigned int plt0_got2_insn_end
;
741 /* Offsets into plt_entry that are to be replaced with... */
742 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
743 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
744 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
746 /* Length of the PC-relative instruction containing plt_got_offset. */
747 unsigned int plt_got_insn_size
;
749 /* Offset of the end of the PC-relative jump to plt0_entry. */
750 unsigned int plt_plt_insn_end
;
752 /* Offset into plt_entry where the initial value of the GOT entry points. */
753 unsigned int plt_lazy_offset
;
755 /* .eh_frame covering the .plt section. */
756 const bfd_byte
*eh_frame_plt
;
757 unsigned int eh_frame_plt_size
;
759 /* .eh_frame covering the .plt.got section. */
760 const bfd_byte
*eh_frame_plt_got
;
761 unsigned int eh_frame_plt_got_size
;
764 #define get_elf_x86_64_arch_data(bed) \
765 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
767 #define get_elf_x86_64_backend_data(abfd) \
768 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
770 #define GET_PLT_ENTRY_SIZE(abfd) \
771 get_elf_x86_64_backend_data (abfd)->plt_entry_size
773 /* These are the standard parameters. */
774 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed
=
776 elf_x86_64_plt0_entry
, /* plt0_entry */
777 elf_x86_64_plt_entry
, /* plt_entry */
778 sizeof (elf_x86_64_plt_entry
), /* plt_entry_size */
779 2, /* plt0_got1_offset */
780 8, /* plt0_got2_offset */
781 12, /* plt0_got2_insn_end */
782 2, /* plt_got_offset */
783 7, /* plt_reloc_offset */
784 12, /* plt_plt_offset */
785 6, /* plt_got_insn_size */
786 PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
787 6, /* plt_lazy_offset */
788 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
789 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
790 elf_x86_64_eh_frame_plt_got
, /* eh_frame_plt_got */
791 sizeof (elf_x86_64_eh_frame_plt_got
), /* eh_frame_plt_got_size */
794 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed
=
796 elf_x86_64_bnd_plt0_entry
, /* plt0_entry */
797 elf_x86_64_bnd_plt_entry
, /* plt_entry */
798 sizeof (elf_x86_64_bnd_plt_entry
), /* plt_entry_size */
799 2, /* plt0_got1_offset */
800 1+8, /* plt0_got2_offset */
801 1+12, /* plt0_got2_insn_end */
802 1+2, /* plt_got_offset */
803 1, /* plt_reloc_offset */
804 7, /* plt_plt_offset */
805 1+6, /* plt_got_insn_size */
806 11, /* plt_plt_insn_end */
807 0, /* plt_lazy_offset */
808 elf_x86_64_eh_frame_bnd_plt
, /* eh_frame_plt */
809 sizeof (elf_x86_64_eh_frame_bnd_plt
), /* eh_frame_plt_size */
810 elf_x86_64_eh_frame_plt_got
, /* eh_frame_plt_got */
811 sizeof (elf_x86_64_eh_frame_plt_got
), /* eh_frame_plt_got_size */
814 #define elf_backend_arch_data &elf_x86_64_arch_bed
816 /* Is a undefined weak symbol which is resolved to 0. Reference to an
817 undefined weak symbol is resolved to 0 when building executable if
819 1. Has non-GOT/non-PLT relocations in text section. Or
820 2. Has no GOT/PLT relocation.
822 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
823 ((EH)->elf.root.type == bfd_link_hash_undefweak \
824 && bfd_link_executable (INFO) \
825 && (elf_x86_64_hash_table (INFO)->interp == NULL \
827 || (EH)->has_non_got_reloc \
828 || !(INFO)->dynamic_undefined_weak))
830 /* x86-64 ELF linker hash entry. */
832 struct elf_x86_64_link_hash_entry
834 struct elf_link_hash_entry elf
;
836 /* Track dynamic relocs copied for this symbol. */
837 struct elf_dyn_relocs
*dyn_relocs
;
839 #define GOT_UNKNOWN 0
843 #define GOT_TLS_GDESC 4
844 #define GOT_TLS_GD_BOTH_P(type) \
845 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
846 #define GOT_TLS_GD_P(type) \
847 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
848 #define GOT_TLS_GDESC_P(type) \
849 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
850 #define GOT_TLS_GD_ANY_P(type) \
851 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
852 unsigned char tls_type
;
854 /* TRUE if a weak symbol with a real definition needs a copy reloc.
855 When there is a weak symbol with a real definition, the processor
856 independent code will have arranged for us to see the real
857 definition first. We need to copy the needs_copy bit from the
858 real definition and check it when allowing copy reloc in PIE. */
859 unsigned int needs_copy
: 1;
861 /* TRUE if symbol has at least one BND relocation. */
862 unsigned int has_bnd_reloc
: 1;
864 /* TRUE if symbol has GOT or PLT relocations. */
865 unsigned int has_got_reloc
: 1;
867 /* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
868 unsigned int has_non_got_reloc
: 1;
870 /* 0: symbol isn't __tls_get_addr.
871 1: symbol is __tls_get_addr.
872 2: symbol is unknown. */
873 unsigned int tls_get_addr
: 2;
875 /* Reference count of C/C++ function pointer relocations in read-write
876 section which can be resolved at run-time. */
877 bfd_signed_vma func_pointer_refcount
;
879 /* Information about the GOT PLT entry. Filled when there are both
880 GOT and PLT relocations against the same function. */
881 union gotplt_union plt_got
;
883 /* Information about the second PLT entry. Filled when has_bnd_reloc is
885 union gotplt_union plt_bnd
;
887 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
888 starting at the end of the jump table. */
892 #define elf_x86_64_hash_entry(ent) \
893 ((struct elf_x86_64_link_hash_entry *)(ent))
895 struct elf_x86_64_obj_tdata
897 struct elf_obj_tdata root
;
899 /* tls_type for each local got entry. */
900 char *local_got_tls_type
;
902 /* GOTPLT entries for TLS descriptors. */
903 bfd_vma
*local_tlsdesc_gotent
;
906 #define elf_x86_64_tdata(abfd) \
907 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
909 #define elf_x86_64_local_got_tls_type(abfd) \
910 (elf_x86_64_tdata (abfd)->local_got_tls_type)
912 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
913 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
915 #define is_x86_64_elf(bfd) \
916 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
917 && elf_tdata (bfd) != NULL \
918 && elf_object_id (bfd) == X86_64_ELF_DATA)
921 elf_x86_64_mkobject (bfd
*abfd
)
923 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
927 /* x86-64 ELF linker hash table. */
929 struct elf_x86_64_link_hash_table
931 struct elf_link_hash_table elf
;
933 /* Short-cuts to get to dynamic linker sections. */
935 asection
*plt_eh_frame
;
937 asection
*plt_bnd_eh_frame
;
939 asection
*plt_got_eh_frame
;
943 bfd_signed_vma refcount
;
947 /* The amount of space used by the jump slots in the GOT. */
948 bfd_vma sgotplt_jump_table_size
;
950 /* Small local sym cache. */
951 struct sym_cache sym_cache
;
953 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
954 bfd_vma (*r_sym
) (bfd_vma
);
955 unsigned int pointer_r_type
;
956 const char *dynamic_interpreter
;
957 int dynamic_interpreter_size
;
959 /* _TLS_MODULE_BASE_ symbol. */
960 struct bfd_link_hash_entry
*tls_module_base
;
962 /* Used by local STT_GNU_IFUNC symbols. */
963 htab_t loc_hash_table
;
964 void * loc_hash_memory
;
966 /* The offset into splt of the PLT entry for the TLS descriptor
967 resolver. Special values are 0, if not necessary (or not found
968 to be necessary yet), and -1 if needed but not determined
971 /* The offset into sgot of the GOT entry used by the PLT entry
975 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
976 bfd_vma next_jump_slot_index
;
977 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
978 bfd_vma next_irelative_index
;
980 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
981 to read-only sections. */
982 bfd_boolean readonly_dynrelocs_against_ifunc
;
985 /* Get the x86-64 ELF linker hash table from a link_info structure. */
987 #define elf_x86_64_hash_table(p) \
988 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
989 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
991 #define elf_x86_64_compute_jump_table_size(htab) \
992 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
994 /* Create an entry in an x86-64 ELF linker hash table. */
996 static struct bfd_hash_entry
*
997 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
998 struct bfd_hash_table
*table
,
1001 /* Allocate the structure if it has not already been allocated by a
1005 entry
= (struct bfd_hash_entry
*)
1006 bfd_hash_allocate (table
,
1007 sizeof (struct elf_x86_64_link_hash_entry
));
1012 /* Call the allocation method of the superclass. */
1013 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
1016 struct elf_x86_64_link_hash_entry
*eh
;
1018 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
1019 eh
->dyn_relocs
= NULL
;
1020 eh
->tls_type
= GOT_UNKNOWN
;
1022 eh
->has_bnd_reloc
= 0;
1023 eh
->has_got_reloc
= 0;
1024 eh
->has_non_got_reloc
= 0;
1025 eh
->tls_get_addr
= 2;
1026 eh
->func_pointer_refcount
= 0;
1027 eh
->plt_bnd
.offset
= (bfd_vma
) -1;
1028 eh
->plt_got
.offset
= (bfd_vma
) -1;
1029 eh
->tlsdesc_got
= (bfd_vma
) -1;
1035 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
1036 for local symbol so that we can handle local STT_GNU_IFUNC symbols
1037 as global symbol. We reuse indx and dynstr_index for local symbol
1038 hash since they aren't used by global symbols in this backend. */
1041 elf_x86_64_local_htab_hash (const void *ptr
)
1043 struct elf_link_hash_entry
*h
1044 = (struct elf_link_hash_entry
*) ptr
;
1045 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
1048 /* Compare local hash entries. */
1051 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
1053 struct elf_link_hash_entry
*h1
1054 = (struct elf_link_hash_entry
*) ptr1
;
1055 struct elf_link_hash_entry
*h2
1056 = (struct elf_link_hash_entry
*) ptr2
;
1058 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
1061 /* Find and/or create a hash entry for local symbol. */
1063 static struct elf_link_hash_entry
*
1064 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
1065 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
1068 struct elf_x86_64_link_hash_entry e
, *ret
;
1069 asection
*sec
= abfd
->sections
;
1070 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
1071 htab
->r_sym (rel
->r_info
));
1074 e
.elf
.indx
= sec
->id
;
1075 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
1076 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
1077 create
? INSERT
: NO_INSERT
);
1084 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
1088 ret
= (struct elf_x86_64_link_hash_entry
*)
1089 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
1090 sizeof (struct elf_x86_64_link_hash_entry
));
1093 memset (ret
, 0, sizeof (*ret
));
1094 ret
->elf
.indx
= sec
->id
;
1095 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
1096 ret
->elf
.dynindx
= -1;
1097 ret
->func_pointer_refcount
= 0;
1098 ret
->plt_got
.offset
= (bfd_vma
) -1;
1104 /* Destroy an X86-64 ELF linker hash table. */
1107 elf_x86_64_link_hash_table_free (bfd
*obfd
)
1109 struct elf_x86_64_link_hash_table
*htab
1110 = (struct elf_x86_64_link_hash_table
*) obfd
->link
.hash
;
1112 if (htab
->loc_hash_table
)
1113 htab_delete (htab
->loc_hash_table
);
1114 if (htab
->loc_hash_memory
)
1115 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
1116 _bfd_elf_link_hash_table_free (obfd
);
1119 /* Create an X86-64 ELF linker hash table. */
1121 static struct bfd_link_hash_table
*
1122 elf_x86_64_link_hash_table_create (bfd
*abfd
)
1124 struct elf_x86_64_link_hash_table
*ret
;
1125 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
1127 ret
= (struct elf_x86_64_link_hash_table
*) bfd_zmalloc (amt
);
1131 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1132 elf_x86_64_link_hash_newfunc
,
1133 sizeof (struct elf_x86_64_link_hash_entry
),
1140 if (ABI_64_P (abfd
))
1142 ret
->r_info
= elf64_r_info
;
1143 ret
->r_sym
= elf64_r_sym
;
1144 ret
->pointer_r_type
= R_X86_64_64
;
1145 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
1146 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
1150 ret
->r_info
= elf32_r_info
;
1151 ret
->r_sym
= elf32_r_sym
;
1152 ret
->pointer_r_type
= R_X86_64_32
;
1153 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
1154 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
1157 ret
->loc_hash_table
= htab_try_create (1024,
1158 elf_x86_64_local_htab_hash
,
1159 elf_x86_64_local_htab_eq
,
1161 ret
->loc_hash_memory
= objalloc_create ();
1162 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1164 elf_x86_64_link_hash_table_free (abfd
);
1167 ret
->elf
.root
.hash_table_free
= elf_x86_64_link_hash_table_free
;
1169 return &ret
->elf
.root
;
1172 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1173 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1177 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
1178 struct bfd_link_info
*info
)
1180 struct elf_x86_64_link_hash_table
*htab
;
1182 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1185 htab
= elf_x86_64_hash_table (info
);
1189 /* Set the contents of the .interp section to the interpreter. */
1190 if (bfd_link_executable (info
) && !info
->nointerp
)
1192 asection
*s
= bfd_get_linker_section (dynobj
, ".interp");
1195 s
->size
= htab
->dynamic_interpreter_size
;
1196 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
1200 if (!info
->no_ld_generated_unwind_info
1201 && htab
->plt_eh_frame
== NULL
1202 && htab
->elf
.splt
!= NULL
)
1204 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1205 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1206 | SEC_LINKER_CREATED
);
1208 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1209 if (htab
->plt_eh_frame
== NULL
1210 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
,
1211 ABI_64_P (dynobj
) ? 3 : 2))
1215 /* Align .got section to its entry size. */
1216 if (htab
->elf
.sgot
!= NULL
1217 && !bfd_set_section_alignment (dynobj
, htab
->elf
.sgot
, 3))
1220 /* Align .got.plt section to its entry size. */
1221 if (htab
->elf
.sgotplt
!= NULL
1222 && !bfd_set_section_alignment (dynobj
, htab
->elf
.sgotplt
, 3))
1228 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1231 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1232 struct elf_link_hash_entry
*dir
,
1233 struct elf_link_hash_entry
*ind
)
1235 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1237 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1238 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1240 edir
->has_bnd_reloc
|= eind
->has_bnd_reloc
;
1241 edir
->has_got_reloc
|= eind
->has_got_reloc
;
1242 edir
->has_non_got_reloc
|= eind
->has_non_got_reloc
;
1244 if (eind
->dyn_relocs
!= NULL
)
1246 if (edir
->dyn_relocs
!= NULL
)
1248 struct elf_dyn_relocs
**pp
;
1249 struct elf_dyn_relocs
*p
;
1251 /* Add reloc counts against the indirect sym to the direct sym
1252 list. Merge any entries against the same section. */
1253 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1255 struct elf_dyn_relocs
*q
;
1257 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1258 if (q
->sec
== p
->sec
)
1260 q
->pc_count
+= p
->pc_count
;
1261 q
->count
+= p
->count
;
1268 *pp
= edir
->dyn_relocs
;
1271 edir
->dyn_relocs
= eind
->dyn_relocs
;
1272 eind
->dyn_relocs
= NULL
;
1275 if (ind
->root
.type
== bfd_link_hash_indirect
1276 && dir
->got
.refcount
<= 0)
1278 edir
->tls_type
= eind
->tls_type
;
1279 eind
->tls_type
= GOT_UNKNOWN
;
1282 if (ELIMINATE_COPY_RELOCS
1283 && ind
->root
.type
!= bfd_link_hash_indirect
1284 && dir
->dynamic_adjusted
)
1286 /* If called to transfer flags for a weakdef during processing
1287 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1288 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1289 if (dir
->versioned
!= versioned_hidden
)
1290 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1291 dir
->ref_regular
|= ind
->ref_regular
;
1292 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1293 dir
->needs_plt
|= ind
->needs_plt
;
1294 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1298 if (eind
->func_pointer_refcount
> 0)
1300 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1301 eind
->func_pointer_refcount
= 0;
1304 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1309 elf64_x86_64_elf_object_p (bfd
*abfd
)
1311 /* Set the right machine number for an x86-64 elf64 file. */
1312 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1317 elf32_x86_64_elf_object_p (bfd
*abfd
)
1319 /* Set the right machine number for an x86-64 elf32 file. */
1320 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1324 /* Return TRUE if the TLS access code sequence support transition
1328 elf_x86_64_check_tls_transition (bfd
*abfd
,
1329 struct bfd_link_info
*info
,
1332 Elf_Internal_Shdr
*symtab_hdr
,
1333 struct elf_link_hash_entry
**sym_hashes
,
1334 unsigned int r_type
,
1335 const Elf_Internal_Rela
*rel
,
1336 const Elf_Internal_Rela
*relend
)
1339 unsigned long r_symndx
;
1340 bfd_boolean largepic
= FALSE
;
1341 struct elf_link_hash_entry
*h
;
1343 struct elf_x86_64_link_hash_table
*htab
;
1345 bfd_boolean indirect_call
, tls_get_addr
;
1347 htab
= elf_x86_64_hash_table (info
);
1348 offset
= rel
->r_offset
;
1351 case R_X86_64_TLSGD
:
1352 case R_X86_64_TLSLD
:
1353 if ((rel
+ 1) >= relend
)
1356 if (r_type
== R_X86_64_TLSGD
)
1358 /* Check transition from GD access model. For 64bit, only
1359 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1360 .word 0x6666; rex64; call __tls_get_addr@PLT
1362 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1364 call *__tls_get_addr@GOTPCREL(%rip)
1365 which may be converted to
1366 addr32 call __tls_get_addr
1367 can transit to different access model. For 32bit, only
1368 leaq foo@tlsgd(%rip), %rdi
1369 .word 0x6666; rex64; call __tls_get_addr@PLT
1371 leaq foo@tlsgd(%rip), %rdi
1373 call *__tls_get_addr@GOTPCREL(%rip)
1374 which may be converted to
1375 addr32 call __tls_get_addr
1376 can transit to different access model. For largepic,
1378 leaq foo@tlsgd(%rip), %rdi
1379 movabsq $__tls_get_addr@pltoff, %rax
1383 leaq foo@tlsgd(%rip), %rdi
1384 movabsq $__tls_get_addr@pltoff, %rax
1388 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1390 if ((offset
+ 12) > sec
->size
)
1393 call
= contents
+ offset
+ 4;
1395 || !((call
[1] == 0x48
1403 && call
[3] == 0xe8)))
1405 if (!ABI_64_P (abfd
)
1406 || (offset
+ 19) > sec
->size
1408 || memcmp (call
- 7, leaq
+ 1, 3) != 0
1409 || memcmp (call
, "\x48\xb8", 2) != 0
1413 || !((call
[10] == 0x48 && call
[12] == 0xd8)
1414 || (call
[10] == 0x4c && call
[12] == 0xf8)))
1418 else if (ABI_64_P (abfd
))
1421 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1427 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1430 indirect_call
= call
[2] == 0xff;
1434 /* Check transition from LD access model. Only
1435 leaq foo@tlsld(%rip), %rdi;
1436 call __tls_get_addr@PLT
1438 leaq foo@tlsld(%rip), %rdi;
1439 call *__tls_get_addr@GOTPCREL(%rip)
1440 which may be converted to
1441 addr32 call __tls_get_addr
1442 can transit to different access model. For largepic
1444 leaq foo@tlsld(%rip), %rdi
1445 movabsq $__tls_get_addr@pltoff, %rax
1449 leaq foo@tlsld(%rip), %rdi
1450 movabsq $__tls_get_addr@pltoff, %rax
1454 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1456 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1459 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1462 call
= contents
+ offset
+ 4;
1463 if (!(call
[0] == 0xe8
1464 || (call
[0] == 0xff && call
[1] == 0x15)
1465 || (call
[0] == 0x67 && call
[1] == 0xe8)))
1467 if (!ABI_64_P (abfd
)
1468 || (offset
+ 19) > sec
->size
1469 || memcmp (call
, "\x48\xb8", 2) != 0
1473 || !((call
[10] == 0x48 && call
[12] == 0xd8)
1474 || (call
[10] == 0x4c && call
[12] == 0xf8)))
1478 indirect_call
= call
[0] == 0xff;
1481 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1482 if (r_symndx
< symtab_hdr
->sh_info
)
1485 tls_get_addr
= FALSE
;
1486 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1487 if (h
!= NULL
&& h
->root
.root
.string
!= NULL
)
1489 struct elf_x86_64_link_hash_entry
*eh
1490 = (struct elf_x86_64_link_hash_entry
*) h
;
1491 tls_get_addr
= eh
->tls_get_addr
== 1;
1492 if (eh
->tls_get_addr
> 1)
1494 /* Use strncmp to check __tls_get_addr since
1495 __tls_get_addr may be versioned. */
1496 if (strncmp (h
->root
.root
.string
, "__tls_get_addr", 14)
1499 eh
->tls_get_addr
= 1;
1500 tls_get_addr
= TRUE
;
1503 eh
->tls_get_addr
= 0;
1510 return ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
;
1511 else if (indirect_call
)
1512 return ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_GOTPCRELX
;
1514 return (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1515 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
);
1517 case R_X86_64_GOTTPOFF
:
1518 /* Check transition from IE access model:
1519 mov foo@gottpoff(%rip), %reg
1520 add foo@gottpoff(%rip), %reg
1523 /* Check REX prefix first. */
1524 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1526 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1527 if (val
!= 0x48 && val
!= 0x4c)
1529 /* X32 may have 0x44 REX prefix or no REX prefix. */
1530 if (ABI_64_P (abfd
))
1536 /* X32 may not have any REX prefix. */
1537 if (ABI_64_P (abfd
))
1539 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1543 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1544 if (val
!= 0x8b && val
!= 0x03)
1547 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1548 return (val
& 0xc7) == 5;
1550 case R_X86_64_GOTPC32_TLSDESC
:
1551 /* Check transition from GDesc access model:
1552 leaq x@tlsdesc(%rip), %rax
1554 Make sure it's a leaq adding rip to a 32-bit offset
1555 into any register, although it's probably almost always
1558 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1561 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1562 if ((val
& 0xfb) != 0x48)
1565 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1568 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1569 return (val
& 0xc7) == 0x05;
1571 case R_X86_64_TLSDESC_CALL
:
1572 /* Check transition from GDesc access model:
1573 call *x@tlsdesc(%rax)
1575 if (offset
+ 2 <= sec
->size
)
1577 /* Make sure that it's a call *x@tlsdesc(%rax). */
1578 call
= contents
+ offset
;
1579 return call
[0] == 0xff && call
[1] == 0x10;
1589 /* Return TRUE if the TLS access transition is OK or no transition
1590 will be performed. Update R_TYPE if there is a transition. */
1593 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1594 asection
*sec
, bfd_byte
*contents
,
1595 Elf_Internal_Shdr
*symtab_hdr
,
1596 struct elf_link_hash_entry
**sym_hashes
,
1597 unsigned int *r_type
, int tls_type
,
1598 const Elf_Internal_Rela
*rel
,
1599 const Elf_Internal_Rela
*relend
,
1600 struct elf_link_hash_entry
*h
,
1601 unsigned long r_symndx
,
1602 bfd_boolean from_relocate_section
)
1604 unsigned int from_type
= *r_type
;
1605 unsigned int to_type
= from_type
;
1606 bfd_boolean check
= TRUE
;
1608 /* Skip TLS transition for functions. */
1610 && (h
->type
== STT_FUNC
1611 || h
->type
== STT_GNU_IFUNC
))
1616 case R_X86_64_TLSGD
:
1617 case R_X86_64_GOTPC32_TLSDESC
:
1618 case R_X86_64_TLSDESC_CALL
:
1619 case R_X86_64_GOTTPOFF
:
1620 if (bfd_link_executable (info
))
1623 to_type
= R_X86_64_TPOFF32
;
1625 to_type
= R_X86_64_GOTTPOFF
;
1628 /* When we are called from elf_x86_64_relocate_section, there may
1629 be additional transitions based on TLS_TYPE. */
1630 if (from_relocate_section
)
1632 unsigned int new_to_type
= to_type
;
1634 if (bfd_link_executable (info
)
1637 && tls_type
== GOT_TLS_IE
)
1638 new_to_type
= R_X86_64_TPOFF32
;
1640 if (to_type
== R_X86_64_TLSGD
1641 || to_type
== R_X86_64_GOTPC32_TLSDESC
1642 || to_type
== R_X86_64_TLSDESC_CALL
)
1644 if (tls_type
== GOT_TLS_IE
)
1645 new_to_type
= R_X86_64_GOTTPOFF
;
1648 /* We checked the transition before when we were called from
1649 elf_x86_64_check_relocs. We only want to check the new
1650 transition which hasn't been checked before. */
1651 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1652 to_type
= new_to_type
;
1657 case R_X86_64_TLSLD
:
1658 if (bfd_link_executable (info
))
1659 to_type
= R_X86_64_TPOFF32
;
1666 /* Return TRUE if there is no transition. */
1667 if (from_type
== to_type
)
1670 /* Check if the transition can be performed. */
1672 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1673 symtab_hdr
, sym_hashes
,
1674 from_type
, rel
, relend
))
1676 reloc_howto_type
*from
, *to
;
1679 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1680 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1683 name
= h
->root
.root
.string
;
1686 struct elf_x86_64_link_hash_table
*htab
;
1688 htab
= elf_x86_64_hash_table (info
);
1693 Elf_Internal_Sym
*isym
;
1695 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1697 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1702 /* xgettext:c-format */
1703 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1704 "in section `%A' failed"),
1705 abfd
, from
->name
, to
->name
, name
,
1706 (unsigned long) rel
->r_offset
, sec
);
1707 bfd_set_error (bfd_error_bad_value
);
1715 /* Rename some of the generic section flags to better document how they
1717 #define need_convert_load sec_flg0
1718 #define check_relocs_failed sec_flg1
1721 elf_x86_64_need_pic (bfd
*input_bfd
, asection
*sec
,
1722 struct elf_link_hash_entry
*h
,
1723 Elf_Internal_Shdr
*symtab_hdr
,
1724 Elf_Internal_Sym
*isym
,
1725 reloc_howto_type
*howto
)
1728 const char *und
= "";
1729 const char *pic
= "";
1734 name
= h
->root
.root
.string
;
1735 switch (ELF_ST_VISIBILITY (h
->other
))
1738 v
= _("hidden symbol ");
1741 v
= _("internal symbol ");
1744 v
= _("protected symbol ");
1748 pic
= _("; recompile with -fPIC");
1752 if (!h
->def_regular
&& !h
->def_dynamic
)
1753 und
= _("undefined ");
1757 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, isym
, NULL
);
1758 pic
= _("; recompile with -fPIC");
1761 /* xgettext:c-format */
1762 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1763 "not be used when making a shared object%s"),
1764 input_bfd
, howto
->name
, und
, v
, name
, pic
);
1765 bfd_set_error (bfd_error_bad_value
);
1766 sec
->check_relocs_failed
= 1;
1770 /* With the local symbol, foo, we convert
1771 mov foo@GOTPCREL(%rip), %reg
1775 call/jmp *foo@GOTPCREL(%rip)
1777 nop call foo/jmp foo nop
1778 When PIC is false, convert
1779 test %reg, foo@GOTPCREL(%rip)
1783 binop foo@GOTPCREL(%rip), %reg
1786 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1790 elf_x86_64_convert_load_reloc (bfd
*abfd
, asection
*sec
,
1792 Elf_Internal_Rela
*irel
,
1793 struct elf_link_hash_entry
*h
,
1794 bfd_boolean
*converted
,
1795 struct bfd_link_info
*link_info
)
1797 struct elf_x86_64_link_hash_table
*htab
;
1799 bfd_boolean require_reloc_pc32
;
1801 bfd_boolean to_reloc_pc32
;
1804 bfd_signed_vma raddend
;
1805 unsigned int opcode
;
1807 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
1808 unsigned int r_symndx
;
1810 bfd_vma roff
= irel
->r_offset
;
1812 if (roff
< (r_type
== R_X86_64_REX_GOTPCRELX
? 3 : 2))
1815 raddend
= irel
->r_addend
;
1816 /* Addend for 32-bit PC-relative relocation must be -4. */
1820 htab
= elf_x86_64_hash_table (link_info
);
1821 is_pic
= bfd_link_pic (link_info
);
1823 relocx
= (r_type
== R_X86_64_GOTPCRELX
1824 || r_type
== R_X86_64_REX_GOTPCRELX
);
1826 /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
1829 = link_info
->disable_target_specific_optimizations
> 1;
1831 r_symndx
= htab
->r_sym (irel
->r_info
);
1833 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
1835 /* Convert mov to lea since it has been done for a while. */
1838 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1839 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1840 test, xor instructions. */
1845 /* We convert only to R_X86_64_PC32:
1847 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1848 3. require_reloc_pc32 is true.
1851 to_reloc_pc32
= (opcode
== 0xff
1853 || require_reloc_pc32
1856 /* Get the symbol referred to by the reloc. */
1859 Elf_Internal_Sym
*isym
1860 = bfd_sym_from_r_symndx (&htab
->sym_cache
, abfd
, r_symndx
);
1862 /* Skip relocation against undefined symbols. */
1863 if (isym
->st_shndx
== SHN_UNDEF
)
1866 symtype
= ELF_ST_TYPE (isym
->st_info
);
1868 if (isym
->st_shndx
== SHN_ABS
)
1869 tsec
= bfd_abs_section_ptr
;
1870 else if (isym
->st_shndx
== SHN_COMMON
)
1871 tsec
= bfd_com_section_ptr
;
1872 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
1873 tsec
= &_bfd_elf_large_com_section
;
1875 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1877 toff
= isym
->st_value
;
1881 /* Undefined weak symbol is only bound locally in executable
1882 and its reference is resolved as 0 without relocation
1883 overflow. We can only perform this optimization for
1884 GOTPCRELX relocations since we need to modify REX byte.
1885 It is OK convert mov with R_X86_64_GOTPCREL to
1887 if ((relocx
|| opcode
== 0x8b)
1888 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info
,
1890 elf_x86_64_hash_entry (h
)))
1894 /* Skip for branch instructions since R_X86_64_PC32
1896 if (require_reloc_pc32
)
1901 /* For non-branch instructions, we can convert to
1902 R_X86_64_32/R_X86_64_32S since we know if there
1904 to_reloc_pc32
= FALSE
;
1907 /* Since we don't know the current PC when PIC is true,
1908 we can't convert to R_X86_64_PC32. */
1909 if (to_reloc_pc32
&& is_pic
)
1914 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1915 ld.so may use its link-time address. */
1916 else if ((h
->def_regular
1917 || h
->root
.type
== bfd_link_hash_defined
1918 || h
->root
.type
== bfd_link_hash_defweak
)
1919 && h
!= htab
->elf
.hdynamic
1920 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
1922 /* bfd_link_hash_new or bfd_link_hash_undefined is
1923 set by an assignment in a linker script in
1924 bfd_elf_record_link_assignment. */
1926 && (h
->root
.type
== bfd_link_hash_new
1927 || h
->root
.type
== bfd_link_hash_undefined
1928 || ((h
->root
.type
== bfd_link_hash_defined
1929 || h
->root
.type
== bfd_link_hash_defweak
)
1930 && h
->root
.u
.def
.section
== bfd_und_section_ptr
)))
1932 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1933 if (require_reloc_pc32
)
1937 tsec
= h
->root
.u
.def
.section
;
1938 toff
= h
->root
.u
.def
.value
;
1945 /* Don't convert GOTPCREL relocation against large section. */
1946 if (elf_section_data (tsec
) != NULL
1947 && (elf_section_flags (tsec
) & SHF_X86_64_LARGE
) != 0)
1950 /* We can only estimate relocation overflow for R_X86_64_PC32. */
1954 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
1956 /* At this stage in linking, no SEC_MERGE symbol has been
1957 adjusted, so all references to such symbols need to be
1958 passed through _bfd_merged_section_offset. (Later, in
1959 relocate_section, all SEC_MERGE symbols *except* for
1960 section symbols have been adjusted.)
1962 gas may reduce relocations against symbols in SEC_MERGE
1963 sections to a relocation against the section symbol when
1964 the original addend was zero. When the reloc is against
1965 a section symbol we should include the addend in the
1966 offset passed to _bfd_merged_section_offset, since the
1967 location of interest is the original symbol. On the
1968 other hand, an access to "sym+addend" where "sym" is not
1969 a section symbol should not include the addend; Such an
1970 access is presumed to be an offset from "sym"; The
1971 location of interest is just "sym". */
1972 if (symtype
== STT_SECTION
)
1975 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
1976 elf_section_data (tsec
)->sec_info
,
1979 if (symtype
!= STT_SECTION
)
1985 /* Don't convert if R_X86_64_PC32 relocation overflows. */
1986 if (tsec
->output_section
== sec
->output_section
)
1988 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
1993 bfd_signed_vma distance
;
1995 /* At this point, we don't know the load addresses of TSEC
1996 section nor SEC section. We estimate the distrance between
1997 SEC and TSEC. We store the estimated distances in the
1998 compressed_size field of the output section, which is only
1999 used to decompress the compressed input section. */
2000 if (sec
->output_section
->compressed_size
== 0)
2003 bfd_size_type size
= 0;
2004 for (asect
= link_info
->output_bfd
->sections
;
2006 asect
= asect
->next
)
2007 /* Skip debug sections since compressed_size is used to
2008 compress debug sections. */
2009 if ((asect
->flags
& SEC_DEBUGGING
) == 0)
2012 for (i
= asect
->map_head
.s
;
2016 size
= align_power (size
, i
->alignment_power
);
2019 asect
->compressed_size
= size
;
2023 /* Don't convert GOTPCREL relocations if TSEC isn't placed
2025 distance
= (tsec
->output_section
->compressed_size
2026 - sec
->output_section
->compressed_size
);
2030 /* Take PT_GNU_RELRO segment into account by adding
2032 if ((toff
+ distance
+ get_elf_backend_data (abfd
)->maxpagesize
2033 - roff
+ 0x80000000) > 0xffffffff)
2040 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
2045 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
2047 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
2050 /* Convert to "jmp foo nop". */
2053 nop_offset
= irel
->r_offset
+ 3;
2054 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
2055 irel
->r_offset
-= 1;
2056 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
2060 struct elf_x86_64_link_hash_entry
*eh
2061 = (struct elf_x86_64_link_hash_entry
*) h
;
2063 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2066 /* To support TLS optimization, always use addr32 prefix for
2067 "call *__tls_get_addr@GOTPCREL(%rip)". */
2068 if (eh
&& eh
->tls_get_addr
== 1)
2071 nop_offset
= irel
->r_offset
- 2;
2075 nop
= link_info
->call_nop_byte
;
2076 if (link_info
->call_nop_as_suffix
)
2078 nop_offset
= irel
->r_offset
+ 3;
2079 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
2080 irel
->r_offset
-= 1;
2081 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
2084 nop_offset
= irel
->r_offset
- 2;
2087 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
2088 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
2089 r_type
= R_X86_64_PC32
;
2094 unsigned int rex_mask
= REX_R
;
2096 if (r_type
== R_X86_64_REX_GOTPCRELX
)
2097 rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
2105 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2106 "lea foo(%rip), %reg". */
2108 r_type
= R_X86_64_PC32
;
2112 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2113 "mov $foo, %reg". */
2115 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
2116 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
2117 if ((rex
& REX_W
) != 0
2118 && ABI_64_P (link_info
->output_bfd
))
2120 /* Keep the REX_W bit in REX byte for LP64. */
2121 r_type
= R_X86_64_32S
;
2122 goto rewrite_modrm_rex
;
2126 /* If the REX_W bit in REX byte isn't needed,
2127 use R_X86_64_32 and clear the W bit to avoid
2128 sign-extend imm32 to imm64. */
2129 r_type
= R_X86_64_32
;
2130 /* Clear the W bit in REX byte. */
2132 goto rewrite_modrm_rex
;
2138 /* R_X86_64_PC32 isn't supported. */
2142 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
2145 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
2146 "test $foo, %reg". */
2147 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
2152 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
2153 "binop $foo, %reg". */
2154 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
2158 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
2159 overflow when sign-extending imm32 to imm64. */
2160 r_type
= (rex
& REX_W
) != 0 ? R_X86_64_32S
: R_X86_64_32
;
2163 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
2167 /* Move the R bit to the B bit in REX byte. */
2168 rex
= (rex
& ~rex_mask
) | (rex
& REX_R
) >> 2;
2169 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
2172 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
2176 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
2179 irel
->r_info
= htab
->r_info (r_symndx
, r_type
);
2186 /* Look through the relocs for a section during the first phase, and
2187 calculate needed space in the global offset table, procedure
2188 linkage table, and dynamic reloc sections. */
2191 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
2193 const Elf_Internal_Rela
*relocs
)
2195 struct elf_x86_64_link_hash_table
*htab
;
2196 Elf_Internal_Shdr
*symtab_hdr
;
2197 struct elf_link_hash_entry
**sym_hashes
;
2198 const Elf_Internal_Rela
*rel
;
2199 const Elf_Internal_Rela
*rel_end
;
2202 bfd_boolean use_plt_got
;
2204 if (bfd_link_relocatable (info
))
2207 /* Don't do anything special with non-loaded, non-alloced sections.
2208 In particular, any relocs in such sections should not affect GOT
2209 and PLT reference counting (ie. we don't allow them to create GOT
2210 or PLT entries), there's no possibility or desire to optimize TLS
2211 relocs, and there's not much point in propagating relocs to shared
2212 libs that the dynamic linker won't relocate. */
2213 if ((sec
->flags
& SEC_ALLOC
) == 0)
2216 BFD_ASSERT (is_x86_64_elf (abfd
));
2218 htab
= elf_x86_64_hash_table (info
);
2221 sec
->check_relocs_failed
= 1;
2225 /* Get the section contents. */
2226 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
2227 contents
= elf_section_data (sec
)->this_hdr
.contents
;
2228 else if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
2230 sec
->check_relocs_failed
= 1;
2234 use_plt_got
= get_elf_x86_64_backend_data (abfd
) == &elf_x86_64_arch_bed
;
2236 symtab_hdr
= &elf_symtab_hdr (abfd
);
2237 sym_hashes
= elf_sym_hashes (abfd
);
2241 rel_end
= relocs
+ sec
->reloc_count
;
2242 for (rel
= relocs
; rel
< rel_end
; rel
++)
2244 unsigned int r_type
;
2245 unsigned long r_symndx
;
2246 struct elf_link_hash_entry
*h
;
2247 struct elf_x86_64_link_hash_entry
*eh
;
2248 Elf_Internal_Sym
*isym
;
2250 bfd_boolean size_reloc
;
2252 r_symndx
= htab
->r_sym (rel
->r_info
);
2253 r_type
= ELF32_R_TYPE (rel
->r_info
);
2255 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
2257 /* xgettext:c-format */
2258 _bfd_error_handler (_("%B: bad symbol index: %d"),
2263 if (r_symndx
< symtab_hdr
->sh_info
)
2265 /* A local symbol. */
2266 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2271 /* Check relocation against local STT_GNU_IFUNC symbol. */
2272 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2274 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
2279 /* Fake a STT_GNU_IFUNC symbol. */
2280 h
->type
= STT_GNU_IFUNC
;
2283 h
->forced_local
= 1;
2284 h
->root
.type
= bfd_link_hash_defined
;
2292 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2293 while (h
->root
.type
== bfd_link_hash_indirect
2294 || h
->root
.type
== bfd_link_hash_warning
)
2295 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2298 /* Check invalid x32 relocations. */
2299 if (!ABI_64_P (abfd
))
2305 case R_X86_64_DTPOFF64
:
2306 case R_X86_64_TPOFF64
:
2308 case R_X86_64_GOTOFF64
:
2309 case R_X86_64_GOT64
:
2310 case R_X86_64_GOTPCREL64
:
2311 case R_X86_64_GOTPC64
:
2312 case R_X86_64_GOTPLT64
:
2313 case R_X86_64_PLTOFF64
:
2316 name
= h
->root
.root
.string
;
2318 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
2321 /* xgettext:c-format */
2322 (_("%B: relocation %s against symbol `%s' isn't "
2323 "supported in x32 mode"), abfd
,
2324 x86_64_elf_howto_table
[r_type
].name
, name
);
2325 bfd_set_error (bfd_error_bad_value
);
2338 case R_X86_64_PC32_BND
:
2339 case R_X86_64_PLT32_BND
:
2341 case R_X86_64_PLT32
:
2344 /* MPX PLT is supported only if elf_x86_64_arch_bed
2345 is used in 64-bit mode. */
2348 && (get_elf_x86_64_backend_data (abfd
)
2349 == &elf_x86_64_arch_bed
))
2351 elf_x86_64_hash_entry (h
)->has_bnd_reloc
= 1;
2353 /* Create the second PLT for Intel MPX support. */
2354 if (htab
->plt_bnd
== NULL
)
2356 const struct elf_backend_data
*bed
;
2358 bed
= get_elf_backend_data (info
->output_bfd
);
2359 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
) == 8
2360 && (sizeof (elf_x86_64_bnd_plt2_entry
)
2361 == sizeof (elf_x86_64_legacy_plt2_entry
)));
2363 if (htab
->elf
.dynobj
== NULL
)
2364 htab
->elf
.dynobj
= abfd
;
2366 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2368 (bed
->dynamic_sec_flags
2373 if (htab
->plt_bnd
== NULL
2374 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2380 if (!info
->no_ld_generated_unwind_info
2381 && htab
->plt_bnd_eh_frame
== NULL
)
2383 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
2384 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
2385 | SEC_LINKER_CREATED
);
2386 htab
->plt_bnd_eh_frame
2387 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2390 if (htab
->plt_bnd_eh_frame
== NULL
2391 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2392 htab
->plt_bnd_eh_frame
,
2401 case R_X86_64_GOTPCREL
:
2402 case R_X86_64_GOTPCRELX
:
2403 case R_X86_64_REX_GOTPCRELX
:
2404 case R_X86_64_GOTPCREL64
:
2405 if (htab
->elf
.dynobj
== NULL
)
2406 htab
->elf
.dynobj
= abfd
;
2407 /* Create the ifunc sections for static executables. */
2408 if (h
->type
== STT_GNU_IFUNC
2409 && !_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
,
2415 /* It is referenced by a non-shared object. */
2417 h
->root
.non_ir_ref
= 1;
2419 if (h
->type
== STT_GNU_IFUNC
)
2420 elf_tdata (info
->output_bfd
)->has_gnu_symbols
2421 |= elf_gnu_symbol_ifunc
;
2424 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, contents
,
2425 symtab_hdr
, sym_hashes
,
2426 &r_type
, GOT_UNKNOWN
,
2427 rel
, rel_end
, h
, r_symndx
, FALSE
))
2430 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2433 case R_X86_64_TLSLD
:
2434 htab
->tls_ld_got
.refcount
+= 1;
2437 case R_X86_64_TPOFF32
:
2438 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
2439 return elf_x86_64_need_pic (abfd
, sec
, h
, symtab_hdr
, isym
,
2440 &x86_64_elf_howto_table
[r_type
]);
2442 eh
->has_got_reloc
= 1;
2445 case R_X86_64_GOTTPOFF
:
2446 if (!bfd_link_executable (info
))
2447 info
->flags
|= DF_STATIC_TLS
;
2450 case R_X86_64_GOT32
:
2451 case R_X86_64_GOTPCREL
:
2452 case R_X86_64_GOTPCRELX
:
2453 case R_X86_64_REX_GOTPCRELX
:
2454 case R_X86_64_TLSGD
:
2455 case R_X86_64_GOT64
:
2456 case R_X86_64_GOTPCREL64
:
2457 case R_X86_64_GOTPLT64
:
2458 case R_X86_64_GOTPC32_TLSDESC
:
2459 case R_X86_64_TLSDESC_CALL
:
2460 /* This symbol requires a global offset table entry. */
2462 int tls_type
, old_tls_type
;
2466 default: tls_type
= GOT_NORMAL
; break;
2467 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
2468 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
2469 case R_X86_64_GOTPC32_TLSDESC
:
2470 case R_X86_64_TLSDESC_CALL
:
2471 tls_type
= GOT_TLS_GDESC
; break;
2476 h
->got
.refcount
+= 1;
2477 old_tls_type
= eh
->tls_type
;
2481 bfd_signed_vma
*local_got_refcounts
;
2483 /* This is a global offset table entry for a local symbol. */
2484 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2485 if (local_got_refcounts
== NULL
)
2489 size
= symtab_hdr
->sh_info
;
2490 size
*= sizeof (bfd_signed_vma
)
2491 + sizeof (bfd_vma
) + sizeof (char);
2492 local_got_refcounts
= ((bfd_signed_vma
*)
2493 bfd_zalloc (abfd
, size
));
2494 if (local_got_refcounts
== NULL
)
2496 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
2497 elf_x86_64_local_tlsdesc_gotent (abfd
)
2498 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
2499 elf_x86_64_local_got_tls_type (abfd
)
2500 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
2502 local_got_refcounts
[r_symndx
] += 1;
2504 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
2507 /* If a TLS symbol is accessed using IE at least once,
2508 there is no point to use dynamic model for it. */
2509 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
2510 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
2511 || tls_type
!= GOT_TLS_IE
))
2513 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
2514 tls_type
= old_tls_type
;
2515 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
2516 && GOT_TLS_GD_ANY_P (tls_type
))
2517 tls_type
|= old_tls_type
;
2521 name
= h
->root
.root
.string
;
2523 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
2526 /* xgettext:c-format */
2527 (_("%B: '%s' accessed both as normal and"
2528 " thread local symbol"),
2530 bfd_set_error (bfd_error_bad_value
);
2535 if (old_tls_type
!= tls_type
)
2538 eh
->tls_type
= tls_type
;
2540 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
2545 case R_X86_64_GOTOFF64
:
2546 case R_X86_64_GOTPC32
:
2547 case R_X86_64_GOTPC64
:
2550 eh
->has_got_reloc
= 1;
2551 if (htab
->elf
.sgot
== NULL
)
2553 if (htab
->elf
.dynobj
== NULL
)
2554 htab
->elf
.dynobj
= abfd
;
2555 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
2561 case R_X86_64_PLT32
:
2562 case R_X86_64_PLT32_BND
:
2563 /* This symbol requires a procedure linkage table entry. We
2564 actually build the entry in adjust_dynamic_symbol,
2565 because this might be a case of linking PIC code which is
2566 never referenced by a dynamic object, in which case we
2567 don't need to generate a procedure linkage table entry
2570 /* If this is a local symbol, we resolve it directly without
2571 creating a procedure linkage table entry. */
2575 eh
->has_got_reloc
= 1;
2577 h
->plt
.refcount
+= 1;
2580 case R_X86_64_PLTOFF64
:
2581 /* This tries to form the 'address' of a function relative
2582 to GOT. For global symbols we need a PLT entry. */
2586 h
->plt
.refcount
+= 1;
2590 case R_X86_64_SIZE32
:
2591 case R_X86_64_SIZE64
:
2596 if (!ABI_64_P (abfd
))
2602 /* Check relocation overflow as these relocs may lead to
2603 run-time relocation overflow. Don't error out for
2604 sections we don't care about, such as debug sections or
2605 when relocation overflow check is disabled. */
2606 if (!info
->no_reloc_overflow_check
2607 && (bfd_link_pic (info
)
2608 || (bfd_link_executable (info
)
2612 && (sec
->flags
& SEC_READONLY
) == 0)))
2613 return elf_x86_64_need_pic (abfd
, sec
, h
, symtab_hdr
, isym
,
2614 &x86_64_elf_howto_table
[r_type
]);
2620 case R_X86_64_PC32_BND
:
2624 if (eh
!= NULL
&& (sec
->flags
& SEC_CODE
) != 0)
2625 eh
->has_non_got_reloc
= 1;
2626 /* We are called after all symbols have been resolved. Only
2627 relocation against STT_GNU_IFUNC symbol must go through
2630 && (bfd_link_executable (info
)
2631 || h
->type
== STT_GNU_IFUNC
))
2633 /* If this reloc is in a read-only section, we might
2634 need a copy reloc. We can't check reliably at this
2635 stage whether the section is read-only, as input
2636 sections have not yet been mapped to output sections.
2637 Tentatively set the flag for now, and correct in
2638 adjust_dynamic_symbol. */
2641 /* We may need a .plt entry if the symbol is a function
2642 defined in a shared lib or is a STT_GNU_IFUNC function
2643 referenced from the code or read-only section. */
2645 || (sec
->flags
& (SEC_CODE
| SEC_READONLY
)) != 0)
2646 h
->plt
.refcount
+= 1;
2648 if (r_type
== R_X86_64_PC32
)
2650 /* Since something like ".long foo - ." may be used
2651 as pointer, make sure that PLT is used if foo is
2652 a function defined in a shared library. */
2653 if ((sec
->flags
& SEC_CODE
) == 0)
2654 h
->pointer_equality_needed
= 1;
2656 else if (r_type
!= R_X86_64_PC32_BND
2657 && r_type
!= R_X86_64_PC64
)
2659 h
->pointer_equality_needed
= 1;
2660 /* At run-time, R_X86_64_64 can be resolved for both
2661 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2662 can only be resolved for x32. */
2663 if ((sec
->flags
& SEC_READONLY
) == 0
2664 && (r_type
== R_X86_64_64
2665 || (!ABI_64_P (abfd
)
2666 && (r_type
== R_X86_64_32
2667 || r_type
== R_X86_64_32S
))))
2668 eh
->func_pointer_refcount
+= 1;
2674 /* If we are creating a shared library, and this is a reloc
2675 against a global symbol, or a non PC relative reloc
2676 against a local symbol, then we need to copy the reloc
2677 into the shared library. However, if we are linking with
2678 -Bsymbolic, we do not need to copy a reloc against a
2679 global symbol which is defined in an object we are
2680 including in the link (i.e., DEF_REGULAR is set). At
2681 this point we have not seen all the input files, so it is
2682 possible that DEF_REGULAR is not set now but will be set
2683 later (it is never cleared). In case of a weak definition,
2684 DEF_REGULAR may be cleared later by a strong definition in
2685 a shared library. We account for that possibility below by
2686 storing information in the relocs_copied field of the hash
2687 table entry. A similar situation occurs when creating
2688 shared libraries and symbol visibility changes render the
2691 If on the other hand, we are creating an executable, we
2692 may need to keep relocations for symbols satisfied by a
2693 dynamic library if we manage to avoid copy relocs for the
2696 Generate dynamic pointer relocation against STT_GNU_IFUNC
2697 symbol in the non-code section. */
2698 if ((bfd_link_pic (info
)
2699 && (! IS_X86_64_PCREL_TYPE (r_type
)
2701 && (! (bfd_link_pie (info
)
2702 || SYMBOLIC_BIND (info
, h
))
2703 || h
->root
.type
== bfd_link_hash_defweak
2704 || !h
->def_regular
))))
2706 && h
->type
== STT_GNU_IFUNC
2707 && r_type
== htab
->pointer_r_type
2708 && (sec
->flags
& SEC_CODE
) == 0)
2709 || (ELIMINATE_COPY_RELOCS
2710 && !bfd_link_pic (info
)
2712 && (h
->root
.type
== bfd_link_hash_defweak
2713 || !h
->def_regular
)))
2715 struct elf_dyn_relocs
*p
;
2716 struct elf_dyn_relocs
**head
;
2718 /* We must copy these reloc types into the output file.
2719 Create a reloc section in dynobj and make room for
2723 if (htab
->elf
.dynobj
== NULL
)
2724 htab
->elf
.dynobj
= abfd
;
2726 sreloc
= _bfd_elf_make_dynamic_reloc_section
2727 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
2728 abfd
, /*rela?*/ TRUE
);
2734 /* If this is a global symbol, we count the number of
2735 relocations we need for this symbol. */
2737 head
= &eh
->dyn_relocs
;
2740 /* Track dynamic relocs needed for local syms too.
2741 We really need local syms available to do this
2746 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2751 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2755 /* Beware of type punned pointers vs strict aliasing
2757 vpp
= &(elf_section_data (s
)->local_dynrel
);
2758 head
= (struct elf_dyn_relocs
**)vpp
;
2762 if (p
== NULL
|| p
->sec
!= sec
)
2764 bfd_size_type amt
= sizeof *p
;
2766 p
= ((struct elf_dyn_relocs
*)
2767 bfd_alloc (htab
->elf
.dynobj
, amt
));
2778 /* Count size relocation as PC-relative relocation. */
2779 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2784 /* This relocation describes the C++ object vtable hierarchy.
2785 Reconstruct it for later use during GC. */
2786 case R_X86_64_GNU_VTINHERIT
:
2787 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2791 /* This relocation describes which C++ vtable entries are actually
2792 used. Record for later use during GC. */
2793 case R_X86_64_GNU_VTENTRY
:
2794 BFD_ASSERT (h
!= NULL
);
2796 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2806 && h
->plt
.refcount
> 0
2807 && (((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2808 || h
->got
.refcount
> 0)
2809 && htab
->plt_got
== NULL
)
2811 /* Create the GOT procedure linkage table. */
2812 unsigned int plt_got_align
;
2813 const struct elf_backend_data
*bed
;
2815 bed
= get_elf_backend_data (info
->output_bfd
);
2816 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry
) == 8
2817 && (sizeof (elf_x86_64_bnd_plt2_entry
)
2818 == sizeof (elf_x86_64_legacy_plt2_entry
)));
2821 if (htab
->elf
.dynobj
== NULL
)
2822 htab
->elf
.dynobj
= abfd
;
2824 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2826 (bed
->dynamic_sec_flags
2831 if (htab
->plt_got
== NULL
2832 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2837 if (!info
->no_ld_generated_unwind_info
2838 && htab
->plt_got_eh_frame
== NULL
2839 && get_elf_x86_64_backend_data (abfd
)->eh_frame_plt_got
!= NULL
)
2841 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
2842 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
2843 | SEC_LINKER_CREATED
);
2844 htab
->plt_got_eh_frame
2845 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2848 if (htab
->plt_got_eh_frame
== NULL
2849 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2850 htab
->plt_got_eh_frame
,
2851 ABI_64_P (htab
->elf
.dynobj
) ? 3 : 2))
2856 if ((r_type
== R_X86_64_GOTPCREL
2857 || r_type
== R_X86_64_GOTPCRELX
2858 || r_type
== R_X86_64_REX_GOTPCRELX
)
2859 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2860 sec
->need_convert_load
= 1;
2863 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2865 if (!info
->keep_memory
)
2869 /* Cache the section contents for elf_link_input_bfd. */
2870 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2877 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2879 sec
->check_relocs_failed
= 1;
2883 /* Return the section that should be marked against GC for a given
2887 elf_x86_64_gc_mark_hook (asection
*sec
,
2888 struct bfd_link_info
*info
,
2889 Elf_Internal_Rela
*rel
,
2890 struct elf_link_hash_entry
*h
,
2891 Elf_Internal_Sym
*sym
)
2894 switch (ELF32_R_TYPE (rel
->r_info
))
2896 case R_X86_64_GNU_VTINHERIT
:
2897 case R_X86_64_GNU_VTENTRY
:
2901 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2904 /* Remove undefined weak symbol from the dynamic symbol table if it
2905 is resolved to 0. */
2908 elf_x86_64_fixup_symbol (struct bfd_link_info
*info
,
2909 struct elf_link_hash_entry
*h
)
2911 if (h
->dynindx
!= -1
2912 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
2913 elf_x86_64_hash_entry (h
)->has_got_reloc
,
2914 elf_x86_64_hash_entry (h
)))
2917 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
2923 /* Adjust a symbol defined by a dynamic object and referenced by a
2924 regular object. The current definition is in some section of the
2925 dynamic object, but we're not including those sections. We have to
2926 change the definition to something the rest of the link can
2930 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2931 struct elf_link_hash_entry
*h
)
2933 struct elf_x86_64_link_hash_table
*htab
;
2935 struct elf_x86_64_link_hash_entry
*eh
;
2936 struct elf_dyn_relocs
*p
;
2938 /* STT_GNU_IFUNC symbol must go through PLT. */
2939 if (h
->type
== STT_GNU_IFUNC
)
2941 /* All local STT_GNU_IFUNC references must be treate as local
2942 calls via local PLT. */
2944 && SYMBOL_CALLS_LOCAL (info
, h
))
2946 bfd_size_type pc_count
= 0, count
= 0;
2947 struct elf_dyn_relocs
**pp
;
2949 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2950 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2952 pc_count
+= p
->pc_count
;
2953 p
->count
-= p
->pc_count
;
2962 if (pc_count
|| count
)
2967 /* Increment PLT reference count only for PC-relative
2970 if (h
->plt
.refcount
<= 0)
2971 h
->plt
.refcount
= 1;
2973 h
->plt
.refcount
+= 1;
2978 if (h
->plt
.refcount
<= 0)
2980 h
->plt
.offset
= (bfd_vma
) -1;
2986 /* If this is a function, put it in the procedure linkage table. We
2987 will fill in the contents of the procedure linkage table later,
2988 when we know the address of the .got section. */
2989 if (h
->type
== STT_FUNC
2992 if (h
->plt
.refcount
<= 0
2993 || SYMBOL_CALLS_LOCAL (info
, h
)
2994 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2995 && h
->root
.type
== bfd_link_hash_undefweak
))
2997 /* This case can occur if we saw a PLT32 reloc in an input
2998 file, but the symbol was never referred to by a dynamic
2999 object, or if all references were garbage collected. In
3000 such a case, we don't actually need to build a procedure
3001 linkage table, and we can just do a PC32 reloc instead. */
3002 h
->plt
.offset
= (bfd_vma
) -1;
3009 /* It's possible that we incorrectly decided a .plt reloc was
3010 needed for an R_X86_64_PC32 reloc to a non-function sym in
3011 check_relocs. We can't decide accurately between function and
3012 non-function syms in check-relocs; Objects loaded later in
3013 the link may change h->type. So fix it now. */
3014 h
->plt
.offset
= (bfd_vma
) -1;
3016 /* If this is a weak symbol, and there is a real definition, the
3017 processor independent code will have arranged for us to see the
3018 real definition first, and we can just use the same value. */
3019 if (h
->u
.weakdef
!= NULL
)
3021 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
3022 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
3023 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
3024 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
3025 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
3027 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3028 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
3029 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
3034 /* This is a reference to a symbol defined by a dynamic object which
3035 is not a function. */
3037 /* If we are creating a shared library, we must presume that the
3038 only references to the symbol are via the global offset table.
3039 For such cases we need not do anything here; the relocations will
3040 be handled correctly by relocate_section. */
3041 if (!bfd_link_executable (info
))
3044 /* If there are no references to this symbol that do not use the
3045 GOT, we don't need to generate a copy reloc. */
3046 if (!h
->non_got_ref
)
3049 /* If -z nocopyreloc was given, we won't generate them either. */
3050 if (info
->nocopyreloc
)
3056 if (ELIMINATE_COPY_RELOCS
)
3058 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3059 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
3061 s
= p
->sec
->output_section
;
3062 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
3066 /* If we didn't find any dynamic relocs in read-only sections, then
3067 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
3075 /* We must allocate the symbol in our .dynbss section, which will
3076 become part of the .bss section of the executable. There will be
3077 an entry for this symbol in the .dynsym section. The dynamic
3078 object will contain position independent code, so all references
3079 from the dynamic object to this symbol will go through the global
3080 offset table. The dynamic linker will use the .dynsym entry to
3081 determine the address it must put in the global offset table, so
3082 both the dynamic object and the regular object will refer to the
3083 same memory location for the variable. */
3085 htab
= elf_x86_64_hash_table (info
);
3089 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
3090 to copy the initial value out of the dynamic object and into the
3091 runtime process image. */
3092 if ((h
->root
.u
.def
.section
->flags
& SEC_READONLY
) != 0)
3094 s
= htab
->elf
.sdynrelro
;
3095 srel
= htab
->elf
.sreldynrelro
;
3099 s
= htab
->elf
.sdynbss
;
3100 srel
= htab
->elf
.srelbss
;
3102 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
3104 const struct elf_backend_data
*bed
;
3105 bed
= get_elf_backend_data (info
->output_bfd
);
3106 srel
->size
+= bed
->s
->sizeof_rela
;
3110 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
3113 /* Allocate space in .plt, .got and associated reloc sections for
3117 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
3119 struct bfd_link_info
*info
;
3120 struct elf_x86_64_link_hash_table
*htab
;
3121 struct elf_x86_64_link_hash_entry
*eh
;
3122 struct elf_dyn_relocs
*p
;
3123 const struct elf_backend_data
*bed
;
3124 unsigned int plt_entry_size
;
3125 bfd_boolean resolved_to_zero
;
3127 if (h
->root
.type
== bfd_link_hash_indirect
)
3130 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3132 info
= (struct bfd_link_info
*) inf
;
3133 htab
= elf_x86_64_hash_table (info
);
3136 bed
= get_elf_backend_data (info
->output_bfd
);
3137 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3139 resolved_to_zero
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
3143 /* We can't use the GOT PLT if pointer equality is needed since
3144 finish_dynamic_symbol won't clear symbol value and the dynamic
3145 linker won't update the GOT slot. We will get into an infinite
3146 loop at run-time. */
3147 if (htab
->plt_got
!= NULL
3148 && h
->type
!= STT_GNU_IFUNC
3149 && !h
->pointer_equality_needed
3150 && h
->plt
.refcount
> 0
3151 && h
->got
.refcount
> 0)
3153 /* Don't use the regular PLT if there are both GOT and GOTPLT
3155 h
->plt
.offset
= (bfd_vma
) -1;
3157 /* Use the GOT PLT. */
3158 eh
->plt_got
.refcount
= 1;
3161 /* Clear the reference count of function pointer relocations if
3162 symbol isn't a normal function. */
3163 if (h
->type
!= STT_FUNC
)
3164 eh
->func_pointer_refcount
= 0;
3166 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
3167 here if it is defined and referenced in a non-shared object. */
3168 if (h
->type
== STT_GNU_IFUNC
3171 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
3173 &htab
->readonly_dynrelocs_against_ifunc
,
3176 GOT_ENTRY_SIZE
, TRUE
))
3178 asection
*s
= htab
->plt_bnd
;
3179 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
3181 /* Use the .plt.bnd section if it is created. */
3182 eh
->plt_bnd
.offset
= s
->size
;
3184 /* Make room for this entry in the .plt.bnd section. */
3185 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
3193 /* Don't create the PLT entry if there are only function pointer
3194 relocations which can be resolved at run-time. */
3195 else if (htab
->elf
.dynamic_sections_created
3196 && (h
->plt
.refcount
> eh
->func_pointer_refcount
3197 || eh
->plt_got
.refcount
> 0))
3199 bfd_boolean use_plt_got
;
3201 /* Clear the reference count of function pointer relocations
3203 eh
->func_pointer_refcount
= 0;
3205 if ((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
3207 /* Don't use the regular PLT for DF_BIND_NOW. */
3208 h
->plt
.offset
= (bfd_vma
) -1;
3210 /* Use the GOT PLT. */
3211 h
->got
.refcount
= 1;
3212 eh
->plt_got
.refcount
= 1;
3215 use_plt_got
= eh
->plt_got
.refcount
> 0;
3217 /* Make sure this symbol is output as a dynamic symbol.
3218 Undefined weak syms won't yet be marked as dynamic. */
3219 if (h
->dynindx
== -1
3221 && !resolved_to_zero
)
3223 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3227 if (bfd_link_pic (info
)
3228 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
3230 asection
*s
= htab
->elf
.splt
;
3231 asection
*bnd_s
= htab
->plt_bnd
;
3232 asection
*got_s
= htab
->plt_got
;
3234 /* If this is the first .plt entry, make room for the special
3235 first entry. The .plt section is used by prelink to undo
3236 prelinking for dynamic relocations. */
3238 s
->size
= plt_entry_size
;
3241 eh
->plt_got
.offset
= got_s
->size
;
3244 h
->plt
.offset
= s
->size
;
3246 eh
->plt_bnd
.offset
= bnd_s
->size
;
3249 /* If this symbol is not defined in a regular file, and we are
3250 not generating a shared library, then set the symbol to this
3251 location in the .plt. This is required to make function
3252 pointers compare as equal between the normal executable and
3253 the shared library. */
3254 if (! bfd_link_pic (info
)
3259 /* We need to make a call to the entry of the GOT PLT
3260 instead of regular PLT entry. */
3261 h
->root
.u
.def
.section
= got_s
;
3262 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
3268 /* We need to make a call to the entry of the second
3269 PLT instead of regular PLT entry. */
3270 h
->root
.u
.def
.section
= bnd_s
;
3271 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
3275 h
->root
.u
.def
.section
= s
;
3276 h
->root
.u
.def
.value
= h
->plt
.offset
;
3281 /* Make room for this entry. */
3283 got_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
3286 s
->size
+= plt_entry_size
;
3288 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
3290 /* We also need to make an entry in the .got.plt section,
3291 which will be placed in the .got section by the linker
3293 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
3295 /* There should be no PLT relocation against resolved
3296 undefined weak symbol in executable. */
3297 if (!resolved_to_zero
)
3299 /* We also need to make an entry in the .rela.plt
3301 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
3302 htab
->elf
.srelplt
->reloc_count
++;
3308 eh
->plt_got
.offset
= (bfd_vma
) -1;
3309 h
->plt
.offset
= (bfd_vma
) -1;
3315 eh
->plt_got
.offset
= (bfd_vma
) -1;
3316 h
->plt
.offset
= (bfd_vma
) -1;
3320 eh
->tlsdesc_got
= (bfd_vma
) -1;
3322 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
3323 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
3324 if (h
->got
.refcount
> 0
3325 && bfd_link_executable (info
)
3327 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
3329 h
->got
.offset
= (bfd_vma
) -1;
3331 else if (h
->got
.refcount
> 0)
3335 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3337 /* Make sure this symbol is output as a dynamic symbol.
3338 Undefined weak syms won't yet be marked as dynamic. */
3339 if (h
->dynindx
== -1
3341 && !resolved_to_zero
)
3343 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3347 if (GOT_TLS_GDESC_P (tls_type
))
3349 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
3350 - elf_x86_64_compute_jump_table_size (htab
);
3351 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3352 h
->got
.offset
= (bfd_vma
) -2;
3354 if (! GOT_TLS_GDESC_P (tls_type
)
3355 || GOT_TLS_GD_P (tls_type
))
3358 h
->got
.offset
= s
->size
;
3359 s
->size
+= GOT_ENTRY_SIZE
;
3360 if (GOT_TLS_GD_P (tls_type
))
3361 s
->size
+= GOT_ENTRY_SIZE
;
3363 dyn
= htab
->elf
.dynamic_sections_created
;
3364 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
3365 and two if global. R_X86_64_GOTTPOFF needs one dynamic
3366 relocation. No dynamic relocation against resolved undefined
3367 weak symbol in executable. */
3368 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
3369 || tls_type
== GOT_TLS_IE
)
3370 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3371 else if (GOT_TLS_GD_P (tls_type
))
3372 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
3373 else if (! GOT_TLS_GDESC_P (tls_type
)
3374 && ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3375 && !resolved_to_zero
)
3376 || h
->root
.type
!= bfd_link_hash_undefweak
)
3377 && (bfd_link_pic (info
)
3378 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
3379 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3380 if (GOT_TLS_GDESC_P (tls_type
))
3382 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
3383 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3387 h
->got
.offset
= (bfd_vma
) -1;
3389 if (eh
->dyn_relocs
== NULL
)
3392 /* In the shared -Bsymbolic case, discard space allocated for
3393 dynamic pc-relative relocs against symbols which turn out to be
3394 defined in regular objects. For the normal shared case, discard
3395 space for pc-relative relocs that have become local due to symbol
3396 visibility changes. */
3398 if (bfd_link_pic (info
))
3400 /* Relocs that use pc_count are those that appear on a call
3401 insn, or certain REL relocs that can generated via assembly.
3402 We want calls to protected symbols to resolve directly to the
3403 function rather than going via the plt. If people want
3404 function pointer comparisons to work as expected then they
3405 should avoid writing weird assembly. */
3406 if (SYMBOL_CALLS_LOCAL (info
, h
))
3408 struct elf_dyn_relocs
**pp
;
3410 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
3412 p
->count
-= p
->pc_count
;
3421 /* Also discard relocs on undefined weak syms with non-default
3422 visibility or in PIE. */
3423 if (eh
->dyn_relocs
!= NULL
)
3425 if (h
->root
.type
== bfd_link_hash_undefweak
)
3427 /* Undefined weak symbol is never bound locally in shared
3429 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3430 || resolved_to_zero
)
3431 eh
->dyn_relocs
= NULL
;
3432 else if (h
->dynindx
== -1
3433 && ! h
->forced_local
3434 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
3437 /* For PIE, discard space for pc-relative relocs against
3438 symbols which turn out to need copy relocs. */
3439 else if (bfd_link_executable (info
)
3440 && (h
->needs_copy
|| eh
->needs_copy
)
3444 struct elf_dyn_relocs
**pp
;
3446 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
3448 if (p
->pc_count
!= 0)
3456 else if (ELIMINATE_COPY_RELOCS
)
3458 /* For the non-shared case, discard space for relocs against
3459 symbols which turn out to need copy relocs or are not
3460 dynamic. Keep dynamic relocations for run-time function
3461 pointer initialization. */
3463 if ((!h
->non_got_ref
3464 || eh
->func_pointer_refcount
> 0
3465 || (h
->root
.type
== bfd_link_hash_undefweak
3466 && !resolved_to_zero
))
3469 || (htab
->elf
.dynamic_sections_created
3470 && (h
->root
.type
== bfd_link_hash_undefweak
3471 || h
->root
.type
== bfd_link_hash_undefined
))))
3473 /* Make sure this symbol is output as a dynamic symbol.
3474 Undefined weak syms won't yet be marked as dynamic. */
3475 if (h
->dynindx
== -1
3476 && ! h
->forced_local
3477 && ! resolved_to_zero
3478 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
3481 /* If that succeeded, we know we'll be keeping all the
3483 if (h
->dynindx
!= -1)
3487 eh
->dyn_relocs
= NULL
;
3488 eh
->func_pointer_refcount
= 0;
3493 /* Finally, allocate space. */
3494 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
3498 sreloc
= elf_section_data (p
->sec
)->sreloc
;
3500 BFD_ASSERT (sreloc
!= NULL
);
3502 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3508 /* Allocate space in .plt, .got and associated reloc sections for
3509 local dynamic relocs. */
3512 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
3514 struct elf_link_hash_entry
*h
3515 = (struct elf_link_hash_entry
*) *slot
;
3517 if (h
->type
!= STT_GNU_IFUNC
3521 || h
->root
.type
!= bfd_link_hash_defined
)
3524 return elf_x86_64_allocate_dynrelocs (h
, inf
);
3527 /* Find any dynamic relocs that apply to read-only sections. */
3530 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
3533 struct elf_x86_64_link_hash_entry
*eh
;
3534 struct elf_dyn_relocs
*p
;
3536 /* Skip local IFUNC symbols. */
3537 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
3540 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3541 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
3543 asection
*s
= p
->sec
->output_section
;
3545 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
3547 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
3549 info
->flags
|= DF_TEXTREL
;
3551 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3552 || info
->error_textrel
)
3553 /* xgettext:c-format */
3554 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3555 p
->sec
->owner
, h
->root
.root
.string
,
3558 /* Not an error, just cut short the traversal. */
3565 /* Convert load via the GOT slot to load immediate. */
3568 elf_x86_64_convert_load (bfd
*abfd
, asection
*sec
,
3569 struct bfd_link_info
*link_info
)
3571 Elf_Internal_Shdr
*symtab_hdr
;
3572 Elf_Internal_Rela
*internal_relocs
;
3573 Elf_Internal_Rela
*irel
, *irelend
;
3575 struct elf_x86_64_link_hash_table
*htab
;
3576 bfd_boolean changed
;
3577 bfd_signed_vma
*local_got_refcounts
;
3579 /* Don't even try to convert non-ELF outputs. */
3580 if (!is_elf_hash_table (link_info
->hash
))
3583 /* Nothing to do if there is no need or no output. */
3584 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
3585 || sec
->need_convert_load
== 0
3586 || bfd_is_abs_section (sec
->output_section
))
3589 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3591 /* Load the relocations for this section. */
3592 internal_relocs
= (_bfd_elf_link_read_relocs
3593 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
3594 link_info
->keep_memory
));
3595 if (internal_relocs
== NULL
)
3599 htab
= elf_x86_64_hash_table (link_info
);
3600 local_got_refcounts
= elf_local_got_refcounts (abfd
);
3602 /* Get the section contents. */
3603 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
3604 contents
= elf_section_data (sec
)->this_hdr
.contents
;
3607 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
3611 irelend
= internal_relocs
+ sec
->reloc_count
;
3612 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
3614 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
3615 unsigned int r_symndx
;
3616 struct elf_link_hash_entry
*h
;
3617 bfd_boolean converted
;
3619 if (r_type
!= R_X86_64_GOTPCRELX
3620 && r_type
!= R_X86_64_REX_GOTPCRELX
3621 && r_type
!= R_X86_64_GOTPCREL
)
3624 r_symndx
= htab
->r_sym (irel
->r_info
);
3625 if (r_symndx
< symtab_hdr
->sh_info
)
3626 h
= elf_x86_64_get_local_sym_hash (htab
, sec
->owner
,
3627 (const Elf_Internal_Rela
*) irel
,
3631 h
= elf_sym_hashes (abfd
)[r_symndx
- symtab_hdr
->sh_info
];
3632 while (h
->root
.type
== bfd_link_hash_indirect
3633 || h
->root
.type
== bfd_link_hash_warning
)
3634 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3637 /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
3638 if (h
!= NULL
&& h
->type
== STT_GNU_IFUNC
)
3642 if (!elf_x86_64_convert_load_reloc (abfd
, sec
, contents
, irel
, h
,
3643 &converted
, link_info
))
3648 changed
= converted
;
3651 if (h
->got
.refcount
> 0)
3652 h
->got
.refcount
-= 1;
3656 if (local_got_refcounts
!= NULL
3657 && local_got_refcounts
[r_symndx
] > 0)
3658 local_got_refcounts
[r_symndx
] -= 1;
3663 if (contents
!= NULL
3664 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3666 if (!changed
&& !link_info
->keep_memory
)
3670 /* Cache the section contents for elf_link_input_bfd. */
3671 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3675 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3678 free (internal_relocs
);
3680 elf_section_data (sec
)->relocs
= internal_relocs
;
3686 if (contents
!= NULL
3687 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3689 if (internal_relocs
!= NULL
3690 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3691 free (internal_relocs
);
3695 /* Set the sizes of the dynamic sections. */
3698 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3699 struct bfd_link_info
*info
)
3701 struct elf_x86_64_link_hash_table
*htab
;
3706 const struct elf_backend_data
*bed
;
3707 const struct elf_x86_64_backend_data
*arch_data
;
3709 htab
= elf_x86_64_hash_table (info
);
3712 bed
= get_elf_backend_data (output_bfd
);
3714 dynobj
= htab
->elf
.dynobj
;
3718 /* Set up .got offsets for local syms, and space for local dynamic
3720 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3722 bfd_signed_vma
*local_got
;
3723 bfd_signed_vma
*end_local_got
;
3724 char *local_tls_type
;
3725 bfd_vma
*local_tlsdesc_gotent
;
3726 bfd_size_type locsymcount
;
3727 Elf_Internal_Shdr
*symtab_hdr
;
3730 if (! is_x86_64_elf (ibfd
))
3733 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3735 struct elf_dyn_relocs
*p
;
3737 if (!elf_x86_64_convert_load (ibfd
, s
, info
))
3740 for (p
= (struct elf_dyn_relocs
*)
3741 (elf_section_data (s
)->local_dynrel
);
3745 if (!bfd_is_abs_section (p
->sec
)
3746 && bfd_is_abs_section (p
->sec
->output_section
))
3748 /* Input section has been discarded, either because
3749 it is a copy of a linkonce section or due to
3750 linker script /DISCARD/, so we'll be discarding
3753 else if (p
->count
!= 0)
3755 srel
= elf_section_data (p
->sec
)->sreloc
;
3756 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3757 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3758 && (info
->flags
& DF_TEXTREL
) == 0)
3760 info
->flags
|= DF_TEXTREL
;
3761 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3762 || info
->error_textrel
)
3763 /* xgettext:c-format */
3764 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3765 p
->sec
->owner
, p
->sec
);
3771 local_got
= elf_local_got_refcounts (ibfd
);
3775 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3776 locsymcount
= symtab_hdr
->sh_info
;
3777 end_local_got
= local_got
+ locsymcount
;
3778 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3779 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3781 srel
= htab
->elf
.srelgot
;
3782 for (; local_got
< end_local_got
;
3783 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3785 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3788 if (GOT_TLS_GDESC_P (*local_tls_type
))
3790 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3791 - elf_x86_64_compute_jump_table_size (htab
);
3792 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3793 *local_got
= (bfd_vma
) -2;
3795 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3796 || GOT_TLS_GD_P (*local_tls_type
))
3798 *local_got
= s
->size
;
3799 s
->size
+= GOT_ENTRY_SIZE
;
3800 if (GOT_TLS_GD_P (*local_tls_type
))
3801 s
->size
+= GOT_ENTRY_SIZE
;
3803 if (bfd_link_pic (info
)
3804 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3805 || *local_tls_type
== GOT_TLS_IE
)
3807 if (GOT_TLS_GDESC_P (*local_tls_type
))
3809 htab
->elf
.srelplt
->size
3810 += bed
->s
->sizeof_rela
;
3811 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3813 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3814 || GOT_TLS_GD_P (*local_tls_type
))
3815 srel
->size
+= bed
->s
->sizeof_rela
;
3819 *local_got
= (bfd_vma
) -1;
3823 if (htab
->tls_ld_got
.refcount
> 0)
3825 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3827 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3828 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3829 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3832 htab
->tls_ld_got
.offset
= -1;
3834 /* Allocate global sym .plt and .got entries, and space for global
3835 sym dynamic relocs. */
3836 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3839 /* Allocate .plt and .got entries, and space for local symbols. */
3840 htab_traverse (htab
->loc_hash_table
,
3841 elf_x86_64_allocate_local_dynrelocs
,
3844 /* For every jump slot reserved in the sgotplt, reloc_count is
3845 incremented. However, when we reserve space for TLS descriptors,
3846 it's not incremented, so in order to compute the space reserved
3847 for them, it suffices to multiply the reloc count by the jump
3850 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3851 so that R_X86_64_IRELATIVE entries come last. */
3852 if (htab
->elf
.srelplt
)
3854 htab
->sgotplt_jump_table_size
3855 = elf_x86_64_compute_jump_table_size (htab
);
3856 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3858 else if (htab
->elf
.irelplt
)
3859 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3861 if (htab
->tlsdesc_plt
)
3863 /* If we're not using lazy TLS relocations, don't generate the
3864 PLT and GOT entries they require. */
3865 if ((info
->flags
& DF_BIND_NOW
))
3866 htab
->tlsdesc_plt
= 0;
3869 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3870 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3871 /* Reserve room for the initial entry.
3872 FIXME: we could probably do away with it in this case. */
3873 if (htab
->elf
.splt
->size
== 0)
3874 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3875 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3876 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3880 if (htab
->elf
.sgotplt
)
3882 /* Don't allocate .got.plt section if there are no GOT nor PLT
3883 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3884 if ((htab
->elf
.hgot
== NULL
3885 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3886 && (htab
->elf
.sgotplt
->size
3887 == get_elf_backend_data (output_bfd
)->got_header_size
)
3888 && (htab
->elf
.splt
== NULL
3889 || htab
->elf
.splt
->size
== 0)
3890 && (htab
->elf
.sgot
== NULL
3891 || htab
->elf
.sgot
->size
== 0)
3892 && (htab
->elf
.iplt
== NULL
3893 || htab
->elf
.iplt
->size
== 0)
3894 && (htab
->elf
.igotplt
== NULL
3895 || htab
->elf
.igotplt
->size
== 0))
3896 htab
->elf
.sgotplt
->size
= 0;
3899 arch_data
= (htab
->plt_bnd
!= NULL
3900 ? &elf_x86_64_bnd_arch_bed
3901 : get_elf_x86_64_arch_data (bed
));
3903 if (_bfd_elf_eh_frame_present (info
))
3905 if (htab
->plt_eh_frame
!= NULL
3906 && htab
->elf
.splt
!= NULL
3907 && htab
->elf
.splt
->size
!= 0
3908 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
))
3909 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3911 if (htab
->plt_got_eh_frame
!= NULL
3912 && htab
->plt_got
!= NULL
3913 && htab
->plt_got
->size
!= 0
3914 && !bfd_is_abs_section (htab
->plt_got
->output_section
))
3915 htab
->plt_got_eh_frame
->size
= arch_data
->eh_frame_plt_got_size
;
3917 /* Unwind info for .plt.bnd and .plt.got sections are
3919 if (htab
->plt_bnd_eh_frame
!= NULL
3920 && htab
->plt_bnd
!= NULL
3921 && htab
->plt_bnd
->size
!= 0
3922 && !bfd_is_abs_section (htab
->plt_bnd
->output_section
))
3923 htab
->plt_bnd_eh_frame
->size
= arch_data
->eh_frame_plt_got_size
;
3926 /* We now have determined the sizes of the various dynamic sections.
3927 Allocate memory for them. */
3929 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3931 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3934 if (s
== htab
->elf
.splt
3935 || s
== htab
->elf
.sgot
3936 || s
== htab
->elf
.sgotplt
3937 || s
== htab
->elf
.iplt
3938 || s
== htab
->elf
.igotplt
3939 || s
== htab
->plt_bnd
3940 || s
== htab
->plt_got
3941 || s
== htab
->plt_eh_frame
3942 || s
== htab
->plt_got_eh_frame
3943 || s
== htab
->plt_bnd_eh_frame
3944 || s
== htab
->elf
.sdynbss
3945 || s
== htab
->elf
.sdynrelro
)
3947 /* Strip this section if we don't need it; see the
3950 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3952 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3955 /* We use the reloc_count field as a counter if we need
3956 to copy relocs into the output file. */
3957 if (s
!= htab
->elf
.srelplt
)
3962 /* It's not one of our sections, so don't allocate space. */
3968 /* If we don't need this section, strip it from the
3969 output file. This is mostly to handle .rela.bss and
3970 .rela.plt. We must create both sections in
3971 create_dynamic_sections, because they must be created
3972 before the linker maps input sections to output
3973 sections. The linker does that before
3974 adjust_dynamic_symbol is called, and it is that
3975 function which decides whether anything needs to go
3976 into these sections. */
3978 s
->flags
|= SEC_EXCLUDE
;
3982 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3985 /* Allocate memory for the section contents. We use bfd_zalloc
3986 here in case unused entries are not reclaimed before the
3987 section's contents are written out. This should not happen,
3988 but this way if it does, we get a R_X86_64_NONE reloc instead
3990 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3991 if (s
->contents
== NULL
)
3995 if (htab
->plt_eh_frame
!= NULL
3996 && htab
->plt_eh_frame
->contents
!= NULL
)
3998 memcpy (htab
->plt_eh_frame
->contents
,
3999 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
4000 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
4001 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
4004 if (htab
->plt_got_eh_frame
!= NULL
4005 && htab
->plt_got_eh_frame
->contents
!= NULL
)
4007 memcpy (htab
->plt_got_eh_frame
->contents
,
4008 arch_data
->eh_frame_plt_got
,
4009 htab
->plt_got_eh_frame
->size
);
4010 bfd_put_32 (dynobj
, htab
->plt_got
->size
,
4011 (htab
->plt_got_eh_frame
->contents
4012 + PLT_FDE_LEN_OFFSET
));
4015 if (htab
->plt_bnd_eh_frame
!= NULL
4016 && htab
->plt_bnd_eh_frame
->contents
!= NULL
)
4018 memcpy (htab
->plt_bnd_eh_frame
->contents
,
4019 arch_data
->eh_frame_plt_got
,
4020 htab
->plt_bnd_eh_frame
->size
);
4021 bfd_put_32 (dynobj
, htab
->plt_bnd
->size
,
4022 (htab
->plt_bnd_eh_frame
->contents
4023 + PLT_FDE_LEN_OFFSET
));
4026 if (htab
->elf
.dynamic_sections_created
)
4028 /* Add some entries to the .dynamic section. We fill in the
4029 values later, in elf_x86_64_finish_dynamic_sections, but we
4030 must add the entries now so that we get the correct size for
4031 the .dynamic section. The DT_DEBUG entry is filled in by the
4032 dynamic linker and used by the debugger. */
4033 #define add_dynamic_entry(TAG, VAL) \
4034 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4036 if (bfd_link_executable (info
))
4038 if (!add_dynamic_entry (DT_DEBUG
, 0))
4042 if (htab
->elf
.splt
->size
!= 0)
4044 /* DT_PLTGOT is used by prelink even if there is no PLT
4046 if (!add_dynamic_entry (DT_PLTGOT
, 0))
4049 if (htab
->elf
.srelplt
->size
!= 0)
4051 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
4052 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
4053 || !add_dynamic_entry (DT_JMPREL
, 0))
4057 if (htab
->tlsdesc_plt
4058 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
4059 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
4065 if (!add_dynamic_entry (DT_RELA
, 0)
4066 || !add_dynamic_entry (DT_RELASZ
, 0)
4067 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
4070 /* If any dynamic relocs apply to a read-only section,
4071 then we need a DT_TEXTREL entry. */
4072 if ((info
->flags
& DF_TEXTREL
) == 0)
4073 elf_link_hash_traverse (&htab
->elf
,
4074 elf_x86_64_readonly_dynrelocs
,
4077 if ((info
->flags
& DF_TEXTREL
) != 0)
4079 if (htab
->readonly_dynrelocs_against_ifunc
)
4081 info
->callbacks
->einfo
4082 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
4083 bfd_set_error (bfd_error_bad_value
);
4087 if (!add_dynamic_entry (DT_TEXTREL
, 0))
4092 #undef add_dynamic_entry
4098 elf_x86_64_always_size_sections (bfd
*output_bfd
,
4099 struct bfd_link_info
*info
)
4101 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
4105 struct elf_link_hash_entry
*tlsbase
;
4107 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
4108 "_TLS_MODULE_BASE_",
4109 FALSE
, FALSE
, FALSE
);
4111 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
4113 struct elf_x86_64_link_hash_table
*htab
;
4114 struct bfd_link_hash_entry
*bh
= NULL
;
4115 const struct elf_backend_data
*bed
4116 = get_elf_backend_data (output_bfd
);
4118 htab
= elf_x86_64_hash_table (info
);
4122 if (!(_bfd_generic_link_add_one_symbol
4123 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
4124 tls_sec
, 0, NULL
, FALSE
,
4125 bed
->collect
, &bh
)))
4128 htab
->tls_module_base
= bh
;
4130 tlsbase
= (struct elf_link_hash_entry
*)bh
;
4131 tlsbase
->def_regular
= 1;
4132 tlsbase
->other
= STV_HIDDEN
;
4133 tlsbase
->root
.linker_def
= 1;
4134 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
4141 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
4142 executables. Rather than setting it to the beginning of the TLS
4143 section, we have to set it to the end. This function may be called
4144 multiple times, it is idempotent. */
4147 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
4149 struct elf_x86_64_link_hash_table
*htab
;
4150 struct bfd_link_hash_entry
*base
;
4152 if (!bfd_link_executable (info
))
4155 htab
= elf_x86_64_hash_table (info
);
4159 base
= htab
->tls_module_base
;
4163 base
->u
.def
.value
= htab
->elf
.tls_size
;
4166 /* Return the base VMA address which should be subtracted from real addresses
4167 when resolving @dtpoff relocation.
4168 This is PT_TLS segment p_vaddr. */
4171 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
4173 /* If tls_sec is NULL, we should have signalled an error already. */
4174 if (elf_hash_table (info
)->tls_sec
== NULL
)
4176 return elf_hash_table (info
)->tls_sec
->vma
;
4179 /* Return the relocation value for @tpoff relocation
4180 if STT_TLS virtual address is ADDRESS. */
4183 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
4185 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
4186 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
4187 bfd_vma static_tls_size
;
4189 /* If tls_segment is NULL, we should have signalled an error already. */
4190 if (htab
->tls_sec
== NULL
)
4193 /* Consider special static TLS alignment requirements. */
4194 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
4195 return address
- static_tls_size
- htab
->tls_sec
->vma
;
4198 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
4202 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
4204 /* Opcode Instruction
4207 0x0f 0x8x conditional jump */
4209 && (contents
[offset
- 1] == 0xe8
4210 || contents
[offset
- 1] == 0xe9))
4212 && contents
[offset
- 2] == 0x0f
4213 && (contents
[offset
- 1] & 0xf0) == 0x80));
4216 /* Relocate an x86_64 ELF section. */
4219 elf_x86_64_relocate_section (bfd
*output_bfd
,
4220 struct bfd_link_info
*info
,
4222 asection
*input_section
,
4224 Elf_Internal_Rela
*relocs
,
4225 Elf_Internal_Sym
*local_syms
,
4226 asection
**local_sections
)
4228 struct elf_x86_64_link_hash_table
*htab
;
4229 Elf_Internal_Shdr
*symtab_hdr
;
4230 struct elf_link_hash_entry
**sym_hashes
;
4231 bfd_vma
*local_got_offsets
;
4232 bfd_vma
*local_tlsdesc_gotents
;
4233 Elf_Internal_Rela
*rel
;
4234 Elf_Internal_Rela
*wrel
;
4235 Elf_Internal_Rela
*relend
;
4236 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
4238 BFD_ASSERT (is_x86_64_elf (input_bfd
));
4240 /* Skip if check_relocs failed. */
4241 if (input_section
->check_relocs_failed
)
4244 htab
= elf_x86_64_hash_table (info
);
4247 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
4248 sym_hashes
= elf_sym_hashes (input_bfd
);
4249 local_got_offsets
= elf_local_got_offsets (input_bfd
);
4250 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
4252 elf_x86_64_set_tls_module_base (info
);
4254 rel
= wrel
= relocs
;
4255 relend
= relocs
+ input_section
->reloc_count
;
4256 for (; rel
< relend
; wrel
++, rel
++)
4258 unsigned int r_type
;
4259 reloc_howto_type
*howto
;
4260 unsigned long r_symndx
;
4261 struct elf_link_hash_entry
*h
;
4262 struct elf_x86_64_link_hash_entry
*eh
;
4263 Elf_Internal_Sym
*sym
;
4265 bfd_vma off
, offplt
, plt_offset
;
4267 bfd_boolean unresolved_reloc
;
4268 bfd_reloc_status_type r
;
4270 asection
*base_got
, *resolved_plt
;
4272 bfd_boolean resolved_to_zero
;
4274 r_type
= ELF32_R_TYPE (rel
->r_info
);
4275 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
4276 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
4283 if (r_type
>= (int) R_X86_64_standard
)
4286 /* xgettext:c-format */
4287 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
4288 input_bfd
, r_type
, input_section
);
4289 bfd_set_error (bfd_error_bad_value
);
4293 if (r_type
!= (int) R_X86_64_32
4294 || ABI_64_P (output_bfd
))
4295 howto
= x86_64_elf_howto_table
+ r_type
;
4297 howto
= (x86_64_elf_howto_table
4298 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
4299 r_symndx
= htab
->r_sym (rel
->r_info
);
4303 unresolved_reloc
= FALSE
;
4304 if (r_symndx
< symtab_hdr
->sh_info
)
4306 sym
= local_syms
+ r_symndx
;
4307 sec
= local_sections
[r_symndx
];
4309 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
4311 st_size
= sym
->st_size
;
4313 /* Relocate against local STT_GNU_IFUNC symbol. */
4314 if (!bfd_link_relocatable (info
)
4315 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4317 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
4322 /* Set STT_GNU_IFUNC symbol value. */
4323 h
->root
.u
.def
.value
= sym
->st_value
;
4324 h
->root
.u
.def
.section
= sec
;
4329 bfd_boolean warned ATTRIBUTE_UNUSED
;
4330 bfd_boolean ignored ATTRIBUTE_UNUSED
;
4332 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
4333 r_symndx
, symtab_hdr
, sym_hashes
,
4335 unresolved_reloc
, warned
, ignored
);
4339 if (sec
!= NULL
&& discarded_section (sec
))
4341 _bfd_clear_contents (howto
, input_bfd
, input_section
,
4342 contents
+ rel
->r_offset
);
4343 wrel
->r_offset
= rel
->r_offset
;
4347 /* For ld -r, remove relocations in debug sections against
4348 sections defined in discarded sections. Not done for
4349 eh_frame editing code expects to be present. */
4350 if (bfd_link_relocatable (info
)
4351 && (input_section
->flags
& SEC_DEBUGGING
))
4357 if (bfd_link_relocatable (info
))
4364 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
4366 if (r_type
== R_X86_64_64
)
4368 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4369 zero-extend it to 64bit if addend is zero. */
4370 r_type
= R_X86_64_32
;
4371 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4373 else if (r_type
== R_X86_64_SIZE64
)
4375 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4376 zero-extend it to 64bit if addend is zero. */
4377 r_type
= R_X86_64_SIZE32
;
4378 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4382 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
4384 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4385 it here if it is defined in a non-shared object. */
4387 && h
->type
== STT_GNU_IFUNC
4393 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4395 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4396 sections because such sections are not SEC_ALLOC and
4397 thus ld.so will not process them. */
4398 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
4408 case R_X86_64_GOTPCREL
:
4409 case R_X86_64_GOTPCRELX
:
4410 case R_X86_64_REX_GOTPCRELX
:
4411 case R_X86_64_GOTPCREL64
:
4412 base_got
= htab
->elf
.sgot
;
4413 off
= h
->got
.offset
;
4415 if (base_got
== NULL
)
4418 if (off
== (bfd_vma
) -1)
4420 /* We can't use h->got.offset here to save state, or
4421 even just remember the offset, as finish_dynamic_symbol
4422 would use that as offset into .got. */
4424 if (h
->plt
.offset
== (bfd_vma
) -1)
4427 if (htab
->elf
.splt
!= NULL
)
4429 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4430 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4431 base_got
= htab
->elf
.sgotplt
;
4435 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4436 off
= plt_index
* GOT_ENTRY_SIZE
;
4437 base_got
= htab
->elf
.igotplt
;
4440 if (h
->dynindx
== -1
4444 /* This references the local defitionion. We must
4445 initialize this entry in the global offset table.
4446 Since the offset must always be a multiple of 8,
4447 we use the least significant bit to record
4448 whether we have initialized it already.
4450 When doing a dynamic link, we create a .rela.got
4451 relocation entry to initialize the value. This
4452 is done in the finish_dynamic_symbol routine. */
4457 bfd_put_64 (output_bfd
, relocation
,
4458 base_got
->contents
+ off
);
4459 /* Note that this is harmless for the GOTPLT64
4460 case, as -1 | 1 still is -1. */
4466 relocation
= (base_got
->output_section
->vma
4467 + base_got
->output_offset
+ off
);
4472 if (h
->plt
.offset
== (bfd_vma
) -1)
4474 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4475 if (r_type
== htab
->pointer_r_type
4476 && (input_section
->flags
& SEC_CODE
) == 0)
4477 goto do_ifunc_pointer
;
4478 goto bad_ifunc_reloc
;
4481 /* STT_GNU_IFUNC symbol must go through PLT. */
4482 if (htab
->elf
.splt
!= NULL
)
4484 if (htab
->plt_bnd
!= NULL
)
4486 resolved_plt
= htab
->plt_bnd
;
4487 plt_offset
= eh
->plt_bnd
.offset
;
4491 resolved_plt
= htab
->elf
.splt
;
4492 plt_offset
= h
->plt
.offset
;
4497 resolved_plt
= htab
->elf
.iplt
;
4498 plt_offset
= h
->plt
.offset
;
4501 relocation
= (resolved_plt
->output_section
->vma
4502 + resolved_plt
->output_offset
+ plt_offset
);
4508 if (h
->root
.root
.string
)
4509 name
= h
->root
.root
.string
;
4511 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4514 /* xgettext:c-format */
4515 (_("%B: relocation %s against STT_GNU_IFUNC "
4516 "symbol `%s' isn't supported"), input_bfd
,
4518 bfd_set_error (bfd_error_bad_value
);
4522 if (bfd_link_pic (info
))
4527 if (ABI_64_P (output_bfd
))
4532 if (rel
->r_addend
!= 0)
4534 if (h
->root
.root
.string
)
4535 name
= h
->root
.root
.string
;
4537 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4540 /* xgettext:c-format */
4541 (_("%B: relocation %s against STT_GNU_IFUNC "
4542 "symbol `%s' has non-zero addend: %d"),
4543 input_bfd
, howto
->name
, name
, rel
->r_addend
);
4544 bfd_set_error (bfd_error_bad_value
);
4548 /* Generate dynamic relcoation only when there is a
4549 non-GOT reference in a shared object or there is no
4551 if ((bfd_link_pic (info
) && h
->non_got_ref
)
4552 || h
->plt
.offset
== (bfd_vma
) -1)
4554 Elf_Internal_Rela outrel
;
4557 /* Need a dynamic relocation to get the real function
4559 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
4563 if (outrel
.r_offset
== (bfd_vma
) -1
4564 || outrel
.r_offset
== (bfd_vma
) -2)
4567 outrel
.r_offset
+= (input_section
->output_section
->vma
4568 + input_section
->output_offset
);
4570 if (h
->dynindx
== -1
4572 || bfd_link_executable (info
))
4574 /* This symbol is resolved locally. */
4575 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4576 outrel
.r_addend
= (h
->root
.u
.def
.value
4577 + h
->root
.u
.def
.section
->output_section
->vma
4578 + h
->root
.u
.def
.section
->output_offset
);
4582 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4583 outrel
.r_addend
= 0;
4586 /* Dynamic relocations are stored in
4587 1. .rela.ifunc section in PIC object.
4588 2. .rela.got section in dynamic executable.
4589 3. .rela.iplt section in static executable. */
4590 if (bfd_link_pic (info
))
4591 sreloc
= htab
->elf
.irelifunc
;
4592 else if (htab
->elf
.splt
!= NULL
)
4593 sreloc
= htab
->elf
.srelgot
;
4595 sreloc
= htab
->elf
.irelplt
;
4596 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4598 /* If this reloc is against an external symbol, we
4599 do not want to fiddle with the addend. Otherwise,
4600 we need to include the symbol value so that it
4601 becomes an addend for the dynamic reloc. For an
4602 internal symbol, we have updated addend. */
4607 case R_X86_64_PC32_BND
:
4609 case R_X86_64_PLT32
:
4610 case R_X86_64_PLT32_BND
:
4615 resolved_to_zero
= (eh
!= NULL
4616 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
4620 /* When generating a shared object, the relocations handled here are
4621 copied into the output file to be resolved at run time. */
4624 case R_X86_64_GOT32
:
4625 case R_X86_64_GOT64
:
4626 /* Relocation is to the entry for this symbol in the global
4628 case R_X86_64_GOTPCREL
:
4629 case R_X86_64_GOTPCRELX
:
4630 case R_X86_64_REX_GOTPCRELX
:
4631 case R_X86_64_GOTPCREL64
:
4632 /* Use global offset table entry as symbol value. */
4633 case R_X86_64_GOTPLT64
:
4634 /* This is obsolete and treated the the same as GOT64. */
4635 base_got
= htab
->elf
.sgot
;
4637 if (htab
->elf
.sgot
== NULL
)
4644 off
= h
->got
.offset
;
4646 && h
->plt
.offset
!= (bfd_vma
)-1
4647 && off
== (bfd_vma
)-1)
4649 /* We can't use h->got.offset here to save
4650 state, or even just remember the offset, as
4651 finish_dynamic_symbol would use that as offset into
4653 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4654 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4655 base_got
= htab
->elf
.sgotplt
;
4658 dyn
= htab
->elf
.dynamic_sections_created
;
4660 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4661 || (bfd_link_pic (info
)
4662 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4663 || (ELF_ST_VISIBILITY (h
->other
)
4664 && h
->root
.type
== bfd_link_hash_undefweak
))
4666 /* This is actually a static link, or it is a -Bsymbolic
4667 link and the symbol is defined locally, or the symbol
4668 was forced to be local because of a version file. We
4669 must initialize this entry in the global offset table.
4670 Since the offset must always be a multiple of 8, we
4671 use the least significant bit to record whether we
4672 have initialized it already.
4674 When doing a dynamic link, we create a .rela.got
4675 relocation entry to initialize the value. This is
4676 done in the finish_dynamic_symbol routine. */
4681 bfd_put_64 (output_bfd
, relocation
,
4682 base_got
->contents
+ off
);
4683 /* Note that this is harmless for the GOTPLT64 case,
4684 as -1 | 1 still is -1. */
4689 unresolved_reloc
= FALSE
;
4693 if (local_got_offsets
== NULL
)
4696 off
= local_got_offsets
[r_symndx
];
4698 /* The offset must always be a multiple of 8. We use
4699 the least significant bit to record whether we have
4700 already generated the necessary reloc. */
4705 bfd_put_64 (output_bfd
, relocation
,
4706 base_got
->contents
+ off
);
4708 if (bfd_link_pic (info
))
4711 Elf_Internal_Rela outrel
;
4713 /* We need to generate a R_X86_64_RELATIVE reloc
4714 for the dynamic linker. */
4715 s
= htab
->elf
.srelgot
;
4719 outrel
.r_offset
= (base_got
->output_section
->vma
4720 + base_got
->output_offset
4722 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4723 outrel
.r_addend
= relocation
;
4724 elf_append_rela (output_bfd
, s
, &outrel
);
4727 local_got_offsets
[r_symndx
] |= 1;
4731 if (off
>= (bfd_vma
) -2)
4734 relocation
= base_got
->output_section
->vma
4735 + base_got
->output_offset
+ off
;
4736 if (r_type
!= R_X86_64_GOTPCREL
4737 && r_type
!= R_X86_64_GOTPCRELX
4738 && r_type
!= R_X86_64_REX_GOTPCRELX
4739 && r_type
!= R_X86_64_GOTPCREL64
)
4740 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4741 - htab
->elf
.sgotplt
->output_offset
;
4745 case R_X86_64_GOTOFF64
:
4746 /* Relocation is relative to the start of the global offset
4749 /* Check to make sure it isn't a protected function or data
4750 symbol for shared library since it may not be local when
4751 used as function address or with copy relocation. We also
4752 need to make sure that a symbol is referenced locally. */
4753 if (bfd_link_pic (info
) && h
)
4755 if (!h
->def_regular
)
4759 switch (ELF_ST_VISIBILITY (h
->other
))
4762 v
= _("hidden symbol");
4765 v
= _("internal symbol");
4768 v
= _("protected symbol");
4776 /* xgettext:c-format */
4777 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s"
4778 " `%s' can not be used when making a shared object"),
4779 input_bfd
, v
, h
->root
.root
.string
);
4780 bfd_set_error (bfd_error_bad_value
);
4783 else if (!bfd_link_executable (info
)
4784 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4785 && (h
->type
== STT_FUNC
4786 || h
->type
== STT_OBJECT
)
4787 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4790 /* xgettext:c-format */
4791 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s"
4792 " `%s' can not be used when making a shared object"),
4794 h
->type
== STT_FUNC
? "function" : "data",
4795 h
->root
.root
.string
);
4796 bfd_set_error (bfd_error_bad_value
);
4801 /* Note that sgot is not involved in this
4802 calculation. We always want the start of .got.plt. If we
4803 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4804 permitted by the ABI, we might have to change this
4806 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4807 + htab
->elf
.sgotplt
->output_offset
;
4810 case R_X86_64_GOTPC32
:
4811 case R_X86_64_GOTPC64
:
4812 /* Use global offset table as symbol value. */
4813 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4814 + htab
->elf
.sgotplt
->output_offset
;
4815 unresolved_reloc
= FALSE
;
4818 case R_X86_64_PLTOFF64
:
4819 /* Relocation is PLT entry relative to GOT. For local
4820 symbols it's the symbol itself relative to GOT. */
4822 /* See PLT32 handling. */
4823 && (h
->plt
.offset
!= (bfd_vma
) -1
4824 || eh
->plt_got
.offset
!= (bfd_vma
) -1)
4825 && htab
->elf
.splt
!= NULL
)
4827 if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
4829 /* Use the GOT PLT. */
4830 resolved_plt
= htab
->plt_got
;
4831 plt_offset
= eh
->plt_got
.offset
;
4833 else if (htab
->plt_bnd
!= NULL
)
4835 resolved_plt
= htab
->plt_bnd
;
4836 plt_offset
= eh
->plt_bnd
.offset
;
4840 resolved_plt
= htab
->elf
.splt
;
4841 plt_offset
= h
->plt
.offset
;
4844 relocation
= (resolved_plt
->output_section
->vma
4845 + resolved_plt
->output_offset
4847 unresolved_reloc
= FALSE
;
4850 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4851 + htab
->elf
.sgotplt
->output_offset
;
4854 case R_X86_64_PLT32
:
4855 case R_X86_64_PLT32_BND
:
4856 /* Relocation is to the entry for this symbol in the
4857 procedure linkage table. */
4859 /* Resolve a PLT32 reloc against a local symbol directly,
4860 without using the procedure linkage table. */
4864 if ((h
->plt
.offset
== (bfd_vma
) -1
4865 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4866 || htab
->elf
.splt
== NULL
)
4868 /* We didn't make a PLT entry for this symbol. This
4869 happens when statically linking PIC code, or when
4870 using -Bsymbolic. */
4874 if (h
->plt
.offset
!= (bfd_vma
) -1)
4876 if (htab
->plt_bnd
!= NULL
)
4878 resolved_plt
= htab
->plt_bnd
;
4879 plt_offset
= eh
->plt_bnd
.offset
;
4883 resolved_plt
= htab
->elf
.splt
;
4884 plt_offset
= h
->plt
.offset
;
4889 /* Use the GOT PLT. */
4890 resolved_plt
= htab
->plt_got
;
4891 plt_offset
= eh
->plt_got
.offset
;
4894 relocation
= (resolved_plt
->output_section
->vma
4895 + resolved_plt
->output_offset
4897 unresolved_reloc
= FALSE
;
4900 case R_X86_64_SIZE32
:
4901 case R_X86_64_SIZE64
:
4902 /* Set to symbol size. */
4903 relocation
= st_size
;
4909 case R_X86_64_PC32_BND
:
4910 /* Don't complain about -fPIC if the symbol is undefined when
4911 building executable unless it is unresolved weak symbol. */
4912 if ((input_section
->flags
& SEC_ALLOC
) != 0
4913 && (input_section
->flags
& SEC_READONLY
) != 0
4915 && ((bfd_link_executable (info
)
4916 && h
->root
.type
== bfd_link_hash_undefweak
4917 && !resolved_to_zero
)
4918 || (bfd_link_pic (info
)
4919 && !(bfd_link_pie (info
)
4920 && h
->root
.type
== bfd_link_hash_undefined
))))
4922 bfd_boolean fail
= FALSE
;
4924 = ((r_type
== R_X86_64_PC32
4925 || r_type
== R_X86_64_PC32_BND
)
4926 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4928 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4930 /* Symbol is referenced locally. Make sure it is
4931 defined locally or for a branch. */
4932 fail
= (!(h
->def_regular
|| ELF_COMMON_DEF_P (h
))
4935 else if (!(bfd_link_pie (info
)
4936 && (h
->needs_copy
|| eh
->needs_copy
)))
4938 /* Symbol doesn't need copy reloc and isn't referenced
4939 locally. We only allow branch to symbol with
4940 non-default visibility. */
4942 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4946 return elf_x86_64_need_pic (input_bfd
, input_section
,
4947 h
, NULL
, NULL
, howto
);
4956 /* FIXME: The ABI says the linker should make sure the value is
4957 the same when it's zeroextended to 64 bit. */
4960 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4963 /* Don't copy a pc-relative relocation into the output file
4964 if the symbol needs copy reloc or the symbol is undefined
4965 when building executable. Copy dynamic function pointer
4966 relocations. Don't generate dynamic relocations against
4967 resolved undefined weak symbols in PIE. */
4968 if ((bfd_link_pic (info
)
4969 && !(bfd_link_pie (info
)
4973 || h
->root
.type
== bfd_link_hash_undefined
)
4974 && (IS_X86_64_PCREL_TYPE (r_type
)
4975 || r_type
== R_X86_64_SIZE32
4976 || r_type
== R_X86_64_SIZE64
))
4978 || ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4979 && !resolved_to_zero
)
4980 || h
->root
.type
!= bfd_link_hash_undefweak
))
4981 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4982 && r_type
!= R_X86_64_SIZE32
4983 && r_type
!= R_X86_64_SIZE64
)
4984 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4985 || (ELIMINATE_COPY_RELOCS
4986 && !bfd_link_pic (info
)
4990 || eh
->func_pointer_refcount
> 0
4991 || (h
->root
.type
== bfd_link_hash_undefweak
4992 && !resolved_to_zero
))
4993 && ((h
->def_dynamic
&& !h
->def_regular
)
4994 /* Undefined weak symbol is bound locally when
4996 || h
->root
.type
== bfd_link_hash_undefined
)))
4998 Elf_Internal_Rela outrel
;
4999 bfd_boolean skip
, relocate
;
5002 /* When generating a shared object, these relocations
5003 are copied into the output file to be resolved at run
5009 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5011 if (outrel
.r_offset
== (bfd_vma
) -1)
5013 else if (outrel
.r_offset
== (bfd_vma
) -2)
5014 skip
= TRUE
, relocate
= TRUE
;
5016 outrel
.r_offset
+= (input_section
->output_section
->vma
5017 + input_section
->output_offset
);
5020 memset (&outrel
, 0, sizeof outrel
);
5022 /* h->dynindx may be -1 if this symbol was marked to
5026 && (IS_X86_64_PCREL_TYPE (r_type
)
5027 || !(bfd_link_executable (info
)
5028 || SYMBOLIC_BIND (info
, h
))
5029 || ! h
->def_regular
))
5031 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
5032 outrel
.r_addend
= rel
->r_addend
;
5036 /* This symbol is local, or marked to become local.
5037 When relocation overflow check is disabled, we
5038 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
5039 if (r_type
== htab
->pointer_r_type
5040 || (r_type
== R_X86_64_32
5041 && info
->no_reloc_overflow_check
))
5044 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5045 outrel
.r_addend
= relocation
+ rel
->r_addend
;
5047 else if (r_type
== R_X86_64_64
5048 && !ABI_64_P (output_bfd
))
5051 outrel
.r_info
= htab
->r_info (0,
5052 R_X86_64_RELATIVE64
);
5053 outrel
.r_addend
= relocation
+ rel
->r_addend
;
5054 /* Check addend overflow. */
5055 if ((outrel
.r_addend
& 0x80000000)
5056 != (rel
->r_addend
& 0x80000000))
5059 int addend
= rel
->r_addend
;
5060 if (h
&& h
->root
.root
.string
)
5061 name
= h
->root
.root
.string
;
5063 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
5067 /* xgettext:c-format */
5068 (_("%B: addend -0x%x in relocation %s against "
5069 "symbol `%s' at 0x%lx in section `%A' is "
5071 input_bfd
, addend
, howto
->name
, name
,
5072 (unsigned long) rel
->r_offset
, input_section
);
5075 /* xgettext:c-format */
5076 (_("%B: addend 0x%x in relocation %s against "
5077 "symbol `%s' at 0x%lx in section `%A' is "
5079 input_bfd
, addend
, howto
->name
, name
,
5080 (unsigned long) rel
->r_offset
, input_section
);
5081 bfd_set_error (bfd_error_bad_value
);
5089 if (bfd_is_abs_section (sec
))
5091 else if (sec
== NULL
|| sec
->owner
== NULL
)
5093 bfd_set_error (bfd_error_bad_value
);
5100 /* We are turning this relocation into one
5101 against a section symbol. It would be
5102 proper to subtract the symbol's value,
5103 osec->vma, from the emitted reloc addend,
5104 but ld.so expects buggy relocs. */
5105 osec
= sec
->output_section
;
5106 sindx
= elf_section_data (osec
)->dynindx
;
5109 asection
*oi
= htab
->elf
.text_index_section
;
5110 sindx
= elf_section_data (oi
)->dynindx
;
5112 BFD_ASSERT (sindx
!= 0);
5115 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
5116 outrel
.r_addend
= relocation
+ rel
->r_addend
;
5120 sreloc
= elf_section_data (input_section
)->sreloc
;
5122 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
5124 r
= bfd_reloc_notsupported
;
5125 goto check_relocation_error
;
5128 elf_append_rela (output_bfd
, sreloc
, &outrel
);
5130 /* If this reloc is against an external symbol, we do
5131 not want to fiddle with the addend. Otherwise, we
5132 need to include the symbol value so that it becomes
5133 an addend for the dynamic reloc. */
5140 case R_X86_64_TLSGD
:
5141 case R_X86_64_GOTPC32_TLSDESC
:
5142 case R_X86_64_TLSDESC_CALL
:
5143 case R_X86_64_GOTTPOFF
:
5144 tls_type
= GOT_UNKNOWN
;
5145 if (h
== NULL
&& local_got_offsets
)
5146 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
5148 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
5150 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5151 input_section
, contents
,
5152 symtab_hdr
, sym_hashes
,
5153 &r_type
, tls_type
, rel
,
5154 relend
, h
, r_symndx
, TRUE
))
5157 if (r_type
== R_X86_64_TPOFF32
)
5159 bfd_vma roff
= rel
->r_offset
;
5161 BFD_ASSERT (! unresolved_reloc
);
5163 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5165 /* GD->LE transition. For 64bit, change
5166 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5167 .word 0x6666; rex64; call __tls_get_addr@PLT
5169 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5171 call *__tls_get_addr@GOTPCREL(%rip)
5172 which may be converted to
5173 addr32 call __tls_get_addr
5176 leaq foo@tpoff(%rax), %rax
5178 leaq foo@tlsgd(%rip), %rdi
5179 .word 0x6666; rex64; call __tls_get_addr@PLT
5181 leaq foo@tlsgd(%rip), %rdi
5183 call *__tls_get_addr@GOTPCREL(%rip)
5184 which may be converted to
5185 addr32 call __tls_get_addr
5188 leaq foo@tpoff(%rax), %rax
5189 For largepic, change:
5190 leaq foo@tlsgd(%rip), %rdi
5191 movabsq $__tls_get_addr@pltoff, %rax
5196 leaq foo@tpoff(%rax), %rax
5197 nopw 0x0(%rax,%rax,1) */
5199 if (ABI_64_P (output_bfd
))
5201 if (contents
[roff
+ 5] == 0xb8)
5203 memcpy (contents
+ roff
- 3,
5204 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
5205 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5209 memcpy (contents
+ roff
- 4,
5210 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5214 memcpy (contents
+ roff
- 3,
5215 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5217 bfd_put_32 (output_bfd
,
5218 elf_x86_64_tpoff (info
, relocation
),
5219 contents
+ roff
+ 8 + largepic
);
5220 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
5221 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
5226 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5228 /* GDesc -> LE transition.
5229 It's originally something like:
5230 leaq x@tlsdesc(%rip), %rax
5233 movl $x@tpoff, %rax. */
5235 unsigned int val
, type
;
5237 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
5238 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
5239 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
5240 contents
+ roff
- 3);
5241 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
5242 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
5243 contents
+ roff
- 1);
5244 bfd_put_32 (output_bfd
,
5245 elf_x86_64_tpoff (info
, relocation
),
5249 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5251 /* GDesc -> LE transition.
5256 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5257 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5260 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
5262 /* IE->LE transition:
5263 For 64bit, originally it can be one of:
5264 movq foo@gottpoff(%rip), %reg
5265 addq foo@gottpoff(%rip), %reg
5268 leaq foo(%reg), %reg
5270 For 32bit, originally it can be one of:
5271 movq foo@gottpoff(%rip), %reg
5272 addl foo@gottpoff(%rip), %reg
5275 leal foo(%reg), %reg
5278 unsigned int val
, type
, reg
;
5281 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
5284 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
5285 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
5291 bfd_put_8 (output_bfd
, 0x49,
5292 contents
+ roff
- 3);
5293 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
5294 bfd_put_8 (output_bfd
, 0x41,
5295 contents
+ roff
- 3);
5296 bfd_put_8 (output_bfd
, 0xc7,
5297 contents
+ roff
- 2);
5298 bfd_put_8 (output_bfd
, 0xc0 | reg
,
5299 contents
+ roff
- 1);
5303 /* addq/addl -> addq/addl - addressing with %rsp/%r12
5306 bfd_put_8 (output_bfd
, 0x49,
5307 contents
+ roff
- 3);
5308 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
5309 bfd_put_8 (output_bfd
, 0x41,
5310 contents
+ roff
- 3);
5311 bfd_put_8 (output_bfd
, 0x81,
5312 contents
+ roff
- 2);
5313 bfd_put_8 (output_bfd
, 0xc0 | reg
,
5314 contents
+ roff
- 1);
5318 /* addq/addl -> leaq/leal */
5320 bfd_put_8 (output_bfd
, 0x4d,
5321 contents
+ roff
- 3);
5322 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
5323 bfd_put_8 (output_bfd
, 0x45,
5324 contents
+ roff
- 3);
5325 bfd_put_8 (output_bfd
, 0x8d,
5326 contents
+ roff
- 2);
5327 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
5328 contents
+ roff
- 1);
5330 bfd_put_32 (output_bfd
,
5331 elf_x86_64_tpoff (info
, relocation
),
5339 if (htab
->elf
.sgot
== NULL
)
5344 off
= h
->got
.offset
;
5345 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
5349 if (local_got_offsets
== NULL
)
5352 off
= local_got_offsets
[r_symndx
];
5353 offplt
= local_tlsdesc_gotents
[r_symndx
];
5360 Elf_Internal_Rela outrel
;
5364 if (htab
->elf
.srelgot
== NULL
)
5367 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
5369 if (GOT_TLS_GDESC_P (tls_type
))
5371 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
5372 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
5373 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
5374 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
5375 + htab
->elf
.sgotplt
->output_offset
5377 + htab
->sgotplt_jump_table_size
);
5378 sreloc
= htab
->elf
.srelplt
;
5380 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
5382 outrel
.r_addend
= 0;
5383 elf_append_rela (output_bfd
, sreloc
, &outrel
);
5386 sreloc
= htab
->elf
.srelgot
;
5388 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5389 + htab
->elf
.sgot
->output_offset
+ off
);
5391 if (GOT_TLS_GD_P (tls_type
))
5392 dr_type
= R_X86_64_DTPMOD64
;
5393 else if (GOT_TLS_GDESC_P (tls_type
))
5396 dr_type
= R_X86_64_TPOFF64
;
5398 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
5399 outrel
.r_addend
= 0;
5400 if ((dr_type
== R_X86_64_TPOFF64
5401 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
5402 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
5403 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
5405 elf_append_rela (output_bfd
, sreloc
, &outrel
);
5407 if (GOT_TLS_GD_P (tls_type
))
5411 BFD_ASSERT (! unresolved_reloc
);
5412 bfd_put_64 (output_bfd
,
5413 relocation
- elf_x86_64_dtpoff_base (info
),
5414 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5418 bfd_put_64 (output_bfd
, 0,
5419 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5420 outrel
.r_info
= htab
->r_info (indx
,
5422 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
5423 elf_append_rela (output_bfd
, sreloc
,
5432 local_got_offsets
[r_symndx
] |= 1;
5435 if (off
>= (bfd_vma
) -2
5436 && ! GOT_TLS_GDESC_P (tls_type
))
5438 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
5440 if (r_type
== R_X86_64_GOTPC32_TLSDESC
5441 || r_type
== R_X86_64_TLSDESC_CALL
)
5442 relocation
= htab
->elf
.sgotplt
->output_section
->vma
5443 + htab
->elf
.sgotplt
->output_offset
5444 + offplt
+ htab
->sgotplt_jump_table_size
;
5446 relocation
= htab
->elf
.sgot
->output_section
->vma
5447 + htab
->elf
.sgot
->output_offset
+ off
;
5448 unresolved_reloc
= FALSE
;
5452 bfd_vma roff
= rel
->r_offset
;
5454 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5456 /* GD->IE transition. For 64bit, change
5457 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5458 .word 0x6666; rex64; call __tls_get_addr@PLT
5460 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5462 call *__tls_get_addr@GOTPCREL(%rip
5463 which may be converted to
5464 addr32 call __tls_get_addr
5467 addq foo@gottpoff(%rip), %rax
5469 leaq foo@tlsgd(%rip), %rdi
5470 .word 0x6666; rex64; call __tls_get_addr@PLT
5472 leaq foo@tlsgd(%rip), %rdi
5474 call *__tls_get_addr@GOTPCREL(%rip)
5475 which may be converted to
5476 addr32 call __tls_get_addr
5479 addq foo@gottpoff(%rip), %rax
5480 For largepic, change:
5481 leaq foo@tlsgd(%rip), %rdi
5482 movabsq $__tls_get_addr@pltoff, %rax
5487 addq foo@gottpoff(%rax), %rax
5488 nopw 0x0(%rax,%rax,1) */
5490 if (ABI_64_P (output_bfd
))
5492 if (contents
[roff
+ 5] == 0xb8)
5494 memcpy (contents
+ roff
- 3,
5495 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5496 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5500 memcpy (contents
+ roff
- 4,
5501 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5505 memcpy (contents
+ roff
- 3,
5506 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5509 relocation
= (htab
->elf
.sgot
->output_section
->vma
5510 + htab
->elf
.sgot
->output_offset
+ off
5513 - input_section
->output_section
->vma
5514 - input_section
->output_offset
5516 bfd_put_32 (output_bfd
, relocation
,
5517 contents
+ roff
+ 8 + largepic
);
5518 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5523 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5525 /* GDesc -> IE transition.
5526 It's originally something like:
5527 leaq x@tlsdesc(%rip), %rax
5530 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5532 /* Now modify the instruction as appropriate. To
5533 turn a leaq into a movq in the form we use it, it
5534 suffices to change the second byte from 0x8d to
5536 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
5538 bfd_put_32 (output_bfd
,
5539 htab
->elf
.sgot
->output_section
->vma
5540 + htab
->elf
.sgot
->output_offset
+ off
5542 - input_section
->output_section
->vma
5543 - input_section
->output_offset
5548 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5550 /* GDesc -> IE transition.
5557 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5558 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5566 case R_X86_64_TLSLD
:
5567 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5568 input_section
, contents
,
5569 symtab_hdr
, sym_hashes
,
5570 &r_type
, GOT_UNKNOWN
, rel
,
5571 relend
, h
, r_symndx
, TRUE
))
5574 if (r_type
!= R_X86_64_TLSLD
)
5576 /* LD->LE transition:
5577 leaq foo@tlsld(%rip), %rdi
5578 call __tls_get_addr@PLT
5579 For 64bit, we change it into:
5580 .word 0x6666; .byte 0x66; movq %fs:0, %rax
5581 For 32bit, we change it into:
5582 nopl 0x0(%rax); movl %fs:0, %eax
5584 leaq foo@tlsld(%rip), %rdi;
5585 call *__tls_get_addr@GOTPCREL(%rip)
5586 which may be converted to
5587 addr32 call __tls_get_addr
5588 For 64bit, we change it into:
5589 .word 0x6666; .word 0x6666; movq %fs:0, %rax
5590 For 32bit, we change it into:
5591 nopw 0x0(%rax); movl %fs:0, %eax
5592 For largepic, change:
5593 leaq foo@tlsgd(%rip), %rdi
5594 movabsq $__tls_get_addr@pltoff, %rax
5598 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
5601 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
5602 if (ABI_64_P (output_bfd
))
5604 if (contents
[rel
->r_offset
+ 5] == 0xb8)
5605 memcpy (contents
+ rel
->r_offset
- 3,
5606 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5607 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5608 else if (contents
[rel
->r_offset
+ 4] == 0xff
5609 || contents
[rel
->r_offset
+ 4] == 0x67)
5610 memcpy (contents
+ rel
->r_offset
- 3,
5611 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
5614 memcpy (contents
+ rel
->r_offset
- 3,
5615 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5619 if (contents
[rel
->r_offset
+ 4] == 0xff)
5620 memcpy (contents
+ rel
->r_offset
- 3,
5621 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
5624 memcpy (contents
+ rel
->r_offset
- 3,
5625 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5627 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
5628 and R_X86_64_PLTOFF64. */
5634 if (htab
->elf
.sgot
== NULL
)
5637 off
= htab
->tls_ld_got
.offset
;
5642 Elf_Internal_Rela outrel
;
5644 if (htab
->elf
.srelgot
== NULL
)
5647 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5648 + htab
->elf
.sgot
->output_offset
+ off
);
5650 bfd_put_64 (output_bfd
, 0,
5651 htab
->elf
.sgot
->contents
+ off
);
5652 bfd_put_64 (output_bfd
, 0,
5653 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5654 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5655 outrel
.r_addend
= 0;
5656 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5658 htab
->tls_ld_got
.offset
|= 1;
5660 relocation
= htab
->elf
.sgot
->output_section
->vma
5661 + htab
->elf
.sgot
->output_offset
+ off
;
5662 unresolved_reloc
= FALSE
;
5665 case R_X86_64_DTPOFF32
:
5666 if (!bfd_link_executable (info
)
5667 || (input_section
->flags
& SEC_CODE
) == 0)
5668 relocation
-= elf_x86_64_dtpoff_base (info
);
5670 relocation
= elf_x86_64_tpoff (info
, relocation
);
5673 case R_X86_64_TPOFF32
:
5674 case R_X86_64_TPOFF64
:
5675 BFD_ASSERT (bfd_link_executable (info
));
5676 relocation
= elf_x86_64_tpoff (info
, relocation
);
5679 case R_X86_64_DTPOFF64
:
5680 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5681 relocation
-= elf_x86_64_dtpoff_base (info
);
5688 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5689 because such sections are not SEC_ALLOC and thus ld.so will
5690 not process them. */
5691 if (unresolved_reloc
5692 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5694 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5695 rel
->r_offset
) != (bfd_vma
) -1)
5698 /* xgettext:c-format */
5699 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5702 (long) rel
->r_offset
,
5704 h
->root
.root
.string
);
5709 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5710 contents
, rel
->r_offset
,
5711 relocation
, rel
->r_addend
);
5713 check_relocation_error
:
5714 if (r
!= bfd_reloc_ok
)
5719 name
= h
->root
.root
.string
;
5722 name
= bfd_elf_string_from_elf_section (input_bfd
,
5723 symtab_hdr
->sh_link
,
5728 name
= bfd_section_name (input_bfd
, sec
);
5731 if (r
== bfd_reloc_overflow
)
5732 (*info
->callbacks
->reloc_overflow
)
5733 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5734 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
5738 /* xgettext:c-format */
5739 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5740 input_bfd
, input_section
,
5741 (long) rel
->r_offset
, name
, (int) r
);
5752 Elf_Internal_Shdr
*rel_hdr
;
5753 size_t deleted
= rel
- wrel
;
5755 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
5756 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5757 if (rel_hdr
->sh_size
== 0)
5759 /* It is too late to remove an empty reloc section. Leave
5761 ??? What is wrong with an empty section??? */
5762 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
5765 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
5766 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5767 input_section
->reloc_count
-= deleted
;
5773 /* Finish up dynamic symbol handling. We set the contents of various
5774 dynamic sections here. */
5777 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5778 struct bfd_link_info
*info
,
5779 struct elf_link_hash_entry
*h
,
5780 Elf_Internal_Sym
*sym
)
5782 struct elf_x86_64_link_hash_table
*htab
;
5783 const struct elf_x86_64_backend_data
*abed
;
5784 bfd_boolean use_plt_bnd
;
5785 struct elf_x86_64_link_hash_entry
*eh
;
5786 bfd_boolean local_undefweak
;
5788 htab
= elf_x86_64_hash_table (info
);
5792 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5793 section only if there is .plt section. */
5794 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5796 ? &elf_x86_64_bnd_arch_bed
5797 : get_elf_x86_64_backend_data (output_bfd
));
5799 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5801 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5802 resolved undefined weak symbols in executable so that their
5803 references have value 0 at run-time. */
5804 local_undefweak
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
5808 if (h
->plt
.offset
!= (bfd_vma
) -1)
5811 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5812 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5813 Elf_Internal_Rela rela
;
5815 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5816 const struct elf_backend_data
*bed
;
5817 bfd_vma plt_got_pcrel_offset
;
5819 /* When building a static executable, use .iplt, .igot.plt and
5820 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5821 if (htab
->elf
.splt
!= NULL
)
5823 plt
= htab
->elf
.splt
;
5824 gotplt
= htab
->elf
.sgotplt
;
5825 relplt
= htab
->elf
.srelplt
;
5829 plt
= htab
->elf
.iplt
;
5830 gotplt
= htab
->elf
.igotplt
;
5831 relplt
= htab
->elf
.irelplt
;
5834 /* This symbol has an entry in the procedure linkage table. Set
5836 if ((h
->dynindx
== -1
5838 && !((h
->forced_local
|| bfd_link_executable (info
))
5840 && h
->type
== STT_GNU_IFUNC
))
5846 /* Get the index in the procedure linkage table which
5847 corresponds to this symbol. This is the index of this symbol
5848 in all the symbols for which we are making plt entries. The
5849 first entry in the procedure linkage table is reserved.
5851 Get the offset into the .got table of the entry that
5852 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5853 bytes. The first three are reserved for the dynamic linker.
5855 For static executables, we don't reserve anything. */
5857 if (plt
== htab
->elf
.splt
)
5859 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5860 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5864 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5865 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5868 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5869 plt_plt_offset
= abed
->plt_plt_offset
;
5870 plt_got_insn_size
= abed
->plt_got_insn_size
;
5871 plt_got_offset
= abed
->plt_got_offset
;
5874 /* Use the second PLT with BND relocations. */
5875 const bfd_byte
*plt_entry
, *plt2_entry
;
5877 if (eh
->has_bnd_reloc
)
5879 plt_entry
= elf_x86_64_bnd_plt_entry
;
5880 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5884 plt_entry
= elf_x86_64_legacy_plt_entry
;
5885 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5887 /* Subtract 1 since there is no BND prefix. */
5888 plt_plt_insn_end
-= 1;
5889 plt_plt_offset
-= 1;
5890 plt_got_insn_size
-= 1;
5891 plt_got_offset
-= 1;
5894 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5895 == sizeof (elf_x86_64_legacy_plt_entry
));
5897 /* Fill in the entry in the procedure linkage table. */
5898 memcpy (plt
->contents
+ h
->plt
.offset
,
5899 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5900 /* Fill in the entry in the second PLT. */
5901 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5902 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5904 resolved_plt
= htab
->plt_bnd
;
5905 plt_offset
= eh
->plt_bnd
.offset
;
5909 /* Fill in the entry in the procedure linkage table. */
5910 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5911 abed
->plt_entry_size
);
5914 plt_offset
= h
->plt
.offset
;
5917 /* Insert the relocation positions of the plt section. */
5919 /* Put offset the PC-relative instruction referring to the GOT entry,
5920 subtracting the size of that instruction. */
5921 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5922 + gotplt
->output_offset
5924 - resolved_plt
->output_section
->vma
5925 - resolved_plt
->output_offset
5927 - plt_got_insn_size
);
5929 /* Check PC-relative offset overflow in PLT entry. */
5930 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5931 /* xgettext:c-format */
5932 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5933 output_bfd
, h
->root
.root
.string
);
5935 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5936 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5938 /* Fill in the entry in the global offset table, initially this
5939 points to the second part of the PLT entry. Leave the entry
5940 as zero for undefined weak symbol in PIE. No PLT relocation
5941 against undefined weak symbol in PIE. */
5942 if (!local_undefweak
)
5944 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5945 + plt
->output_offset
5947 + abed
->plt_lazy_offset
),
5948 gotplt
->contents
+ got_offset
);
5950 /* Fill in the entry in the .rela.plt section. */
5951 rela
.r_offset
= (gotplt
->output_section
->vma
5952 + gotplt
->output_offset
5954 if (h
->dynindx
== -1
5955 || ((bfd_link_executable (info
)
5956 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5958 && h
->type
== STT_GNU_IFUNC
))
5960 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5961 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5962 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5963 rela
.r_addend
= (h
->root
.u
.def
.value
5964 + h
->root
.u
.def
.section
->output_section
->vma
5965 + h
->root
.u
.def
.section
->output_offset
);
5966 /* R_X86_64_IRELATIVE comes last. */
5967 plt_index
= htab
->next_irelative_index
--;
5971 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5973 plt_index
= htab
->next_jump_slot_index
++;
5976 /* Don't fill PLT entry for static executables. */
5977 if (plt
== htab
->elf
.splt
)
5979 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5981 /* Put relocation index. */
5982 bfd_put_32 (output_bfd
, plt_index
,
5983 (plt
->contents
+ h
->plt
.offset
5984 + abed
->plt_reloc_offset
));
5986 /* Put offset for jmp .PLT0 and check for overflow. We don't
5987 check relocation index for overflow since branch displacement
5988 will overflow first. */
5989 if (plt0_offset
> 0x80000000)
5990 /* xgettext:c-format */
5991 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5992 output_bfd
, h
->root
.root
.string
);
5993 bfd_put_32 (output_bfd
, - plt0_offset
,
5994 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5997 bed
= get_elf_backend_data (output_bfd
);
5998 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5999 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
6002 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
6004 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
6005 asection
*plt
, *got
;
6006 bfd_boolean got_after_plt
;
6007 int32_t got_pcrel_offset
;
6008 const bfd_byte
*got_plt_entry
;
6010 /* Set the entry in the GOT procedure linkage table. */
6011 plt
= htab
->plt_got
;
6012 got
= htab
->elf
.sgot
;
6013 got_offset
= h
->got
.offset
;
6015 if (got_offset
== (bfd_vma
) -1
6016 || (h
->type
== STT_GNU_IFUNC
&& h
->def_regular
)
6021 /* Use the second PLT entry template for the GOT PLT since they
6022 are the identical. */
6023 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
6024 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
6025 if (eh
->has_bnd_reloc
)
6026 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
6029 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
6031 /* Subtract 1 since there is no BND prefix. */
6032 plt_got_insn_size
-= 1;
6033 plt_got_offset
-= 1;
6036 /* Fill in the entry in the GOT procedure linkage table. */
6037 plt_offset
= eh
->plt_got
.offset
;
6038 memcpy (plt
->contents
+ plt_offset
,
6039 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
6041 /* Put offset the PC-relative instruction referring to the GOT
6042 entry, subtracting the size of that instruction. */
6043 got_pcrel_offset
= (got
->output_section
->vma
6044 + got
->output_offset
6046 - plt
->output_section
->vma
6047 - plt
->output_offset
6049 - plt_got_insn_size
);
6051 /* Check PC-relative offset overflow in GOT PLT entry. */
6052 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
6053 if ((got_after_plt
&& got_pcrel_offset
< 0)
6054 || (!got_after_plt
&& got_pcrel_offset
> 0))
6055 /* xgettext:c-format */
6056 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
6057 output_bfd
, h
->root
.root
.string
);
6059 bfd_put_32 (output_bfd
, got_pcrel_offset
,
6060 plt
->contents
+ plt_offset
+ plt_got_offset
);
6063 if (!local_undefweak
6065 && (h
->plt
.offset
!= (bfd_vma
) -1
6066 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
6068 /* Mark the symbol as undefined, rather than as defined in
6069 the .plt section. Leave the value if there were any
6070 relocations where pointer equality matters (this is a clue
6071 for the dynamic linker, to make function pointer
6072 comparisons work between an application and shared
6073 library), otherwise set it to zero. If a function is only
6074 called from a binary, there is no need to slow down
6075 shared libraries because of that. */
6076 sym
->st_shndx
= SHN_UNDEF
;
6077 if (!h
->pointer_equality_needed
)
6081 /* Don't generate dynamic GOT relocation against undefined weak
6082 symbol in executable. */
6083 if (h
->got
.offset
!= (bfd_vma
) -1
6084 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
6085 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
6086 && !local_undefweak
)
6088 Elf_Internal_Rela rela
;
6089 asection
*relgot
= htab
->elf
.srelgot
;
6091 /* This symbol has an entry in the global offset table. Set it
6093 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
6096 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
6097 + htab
->elf
.sgot
->output_offset
6098 + (h
->got
.offset
&~ (bfd_vma
) 1));
6100 /* If this is a static link, or it is a -Bsymbolic link and the
6101 symbol is defined locally or was forced to be local because
6102 of a version file, we just want to emit a RELATIVE reloc.
6103 The entry in the global offset table will already have been
6104 initialized in the relocate_section function. */
6106 && h
->type
== STT_GNU_IFUNC
)
6108 if (h
->plt
.offset
== (bfd_vma
) -1)
6110 /* STT_GNU_IFUNC is referenced without PLT. */
6111 if (htab
->elf
.splt
== NULL
)
6113 /* use .rel[a].iplt section to store .got relocations
6114 in static executable. */
6115 relgot
= htab
->elf
.irelplt
;
6117 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
6119 rela
.r_info
= htab
->r_info (0,
6120 R_X86_64_IRELATIVE
);
6121 rela
.r_addend
= (h
->root
.u
.def
.value
6122 + h
->root
.u
.def
.section
->output_section
->vma
6123 + h
->root
.u
.def
.section
->output_offset
);
6128 else if (bfd_link_pic (info
))
6130 /* Generate R_X86_64_GLOB_DAT. */
6137 if (!h
->pointer_equality_needed
)
6140 /* For non-shared object, we can't use .got.plt, which
6141 contains the real function addres if we need pointer
6142 equality. We load the GOT entry with the PLT entry. */
6143 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
6144 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
6145 + plt
->output_offset
6147 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
6151 else if (bfd_link_pic (info
)
6152 && SYMBOL_REFERENCES_LOCAL (info
, h
))
6154 if (!h
->def_regular
)
6156 BFD_ASSERT((h
->got
.offset
& 1) != 0);
6157 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
6158 rela
.r_addend
= (h
->root
.u
.def
.value
6159 + h
->root
.u
.def
.section
->output_section
->vma
6160 + h
->root
.u
.def
.section
->output_offset
);
6164 BFD_ASSERT((h
->got
.offset
& 1) == 0);
6166 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
6167 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
6168 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
6172 elf_append_rela (output_bfd
, relgot
, &rela
);
6177 Elf_Internal_Rela rela
;
6180 /* This symbol needs a copy reloc. Set it up. */
6182 if (h
->dynindx
== -1
6183 || (h
->root
.type
!= bfd_link_hash_defined
6184 && h
->root
.type
!= bfd_link_hash_defweak
)
6185 || htab
->elf
.srelbss
== NULL
6186 || htab
->elf
.sreldynrelro
== NULL
)
6189 rela
.r_offset
= (h
->root
.u
.def
.value
6190 + h
->root
.u
.def
.section
->output_section
->vma
6191 + h
->root
.u
.def
.section
->output_offset
);
6192 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
6194 if (h
->root
.u
.def
.section
== htab
->elf
.sdynrelro
)
6195 s
= htab
->elf
.sreldynrelro
;
6197 s
= htab
->elf
.srelbss
;
6198 elf_append_rela (output_bfd
, s
, &rela
);
6204 /* Finish up local dynamic symbol handling. We set the contents of
6205 various dynamic sections here. */
6208 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
6210 struct elf_link_hash_entry
*h
6211 = (struct elf_link_hash_entry
*) *slot
;
6212 struct bfd_link_info
*info
6213 = (struct bfd_link_info
*) inf
;
6215 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
6219 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
6220 here since undefined weak symbol may not be dynamic and may not be
6221 called for elf_x86_64_finish_dynamic_symbol. */
6224 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry
*bh
,
6227 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
6228 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
6230 if (h
->root
.type
!= bfd_link_hash_undefweak
6231 || h
->dynindx
!= -1)
6234 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
6238 /* Used to decide how to sort relocs in an optimal manner for the
6239 dynamic linker, before writing them out. */
6241 static enum elf_reloc_type_class
6242 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
6243 const asection
*rel_sec ATTRIBUTE_UNUSED
,
6244 const Elf_Internal_Rela
*rela
)
6246 bfd
*abfd
= info
->output_bfd
;
6247 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6248 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
6250 if (htab
->elf
.dynsym
!= NULL
6251 && htab
->elf
.dynsym
->contents
!= NULL
)
6253 /* Check relocation against STT_GNU_IFUNC symbol if there are
6255 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
6256 if (r_symndx
!= STN_UNDEF
)
6258 Elf_Internal_Sym sym
;
6259 if (!bed
->s
->swap_symbol_in (abfd
,
6260 (htab
->elf
.dynsym
->contents
6261 + r_symndx
* bed
->s
->sizeof_sym
),
6265 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
6266 return reloc_class_ifunc
;
6270 switch ((int) ELF32_R_TYPE (rela
->r_info
))
6272 case R_X86_64_IRELATIVE
:
6273 return reloc_class_ifunc
;
6274 case R_X86_64_RELATIVE
:
6275 case R_X86_64_RELATIVE64
:
6276 return reloc_class_relative
;
6277 case R_X86_64_JUMP_SLOT
:
6278 return reloc_class_plt
;
6280 return reloc_class_copy
;
6282 return reloc_class_normal
;
6286 /* Finish up the dynamic sections. */
6289 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
6290 struct bfd_link_info
*info
)
6292 struct elf_x86_64_link_hash_table
*htab
;
6295 const struct elf_x86_64_backend_data
*abed
;
6297 htab
= elf_x86_64_hash_table (info
);
6301 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
6302 section only if there is .plt section. */
6303 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
6304 ? &elf_x86_64_bnd_arch_bed
6305 : get_elf_x86_64_backend_data (output_bfd
));
6307 dynobj
= htab
->elf
.dynobj
;
6308 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
6310 if (htab
->elf
.dynamic_sections_created
)
6312 bfd_byte
*dyncon
, *dynconend
;
6313 const struct elf_backend_data
*bed
;
6314 bfd_size_type sizeof_dyn
;
6316 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
6319 bed
= get_elf_backend_data (dynobj
);
6320 sizeof_dyn
= bed
->s
->sizeof_dyn
;
6321 dyncon
= sdyn
->contents
;
6322 dynconend
= sdyn
->contents
+ sdyn
->size
;
6323 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
6325 Elf_Internal_Dyn dyn
;
6328 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
6336 s
= htab
->elf
.sgotplt
;
6337 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
6341 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
6345 s
= htab
->elf
.srelplt
->output_section
;
6346 dyn
.d_un
.d_val
= s
->size
;
6349 case DT_TLSDESC_PLT
:
6351 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
6352 + htab
->tlsdesc_plt
;
6355 case DT_TLSDESC_GOT
:
6357 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
6358 + htab
->tlsdesc_got
;
6362 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
6365 /* Fill in the special first entry in the procedure linkage table. */
6366 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
6368 /* Fill in the first entry in the procedure linkage table. */
6369 memcpy (htab
->elf
.splt
->contents
,
6370 abed
->plt0_entry
, abed
->plt_entry_size
);
6371 /* Add offset for pushq GOT+8(%rip), since the instruction
6372 uses 6 bytes subtract this value. */
6373 bfd_put_32 (output_bfd
,
6374 (htab
->elf
.sgotplt
->output_section
->vma
6375 + htab
->elf
.sgotplt
->output_offset
6377 - htab
->elf
.splt
->output_section
->vma
6378 - htab
->elf
.splt
->output_offset
6380 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
6381 /* Add offset for the PC-relative instruction accessing GOT+16,
6382 subtracting the offset to the end of that instruction. */
6383 bfd_put_32 (output_bfd
,
6384 (htab
->elf
.sgotplt
->output_section
->vma
6385 + htab
->elf
.sgotplt
->output_offset
6387 - htab
->elf
.splt
->output_section
->vma
6388 - htab
->elf
.splt
->output_offset
6389 - abed
->plt0_got2_insn_end
),
6390 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
6392 elf_section_data (htab
->elf
.splt
->output_section
)
6393 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
6395 if (htab
->tlsdesc_plt
)
6397 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
6398 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
6400 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
6401 abed
->plt0_entry
, abed
->plt_entry_size
);
6403 /* Add offset for pushq GOT+8(%rip), since the
6404 instruction uses 6 bytes subtract this value. */
6405 bfd_put_32 (output_bfd
,
6406 (htab
->elf
.sgotplt
->output_section
->vma
6407 + htab
->elf
.sgotplt
->output_offset
6409 - htab
->elf
.splt
->output_section
->vma
6410 - htab
->elf
.splt
->output_offset
6413 htab
->elf
.splt
->contents
6414 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
6415 /* Add offset for the PC-relative instruction accessing GOT+TDG,
6416 where TGD stands for htab->tlsdesc_got, subtracting the offset
6417 to the end of that instruction. */
6418 bfd_put_32 (output_bfd
,
6419 (htab
->elf
.sgot
->output_section
->vma
6420 + htab
->elf
.sgot
->output_offset
6422 - htab
->elf
.splt
->output_section
->vma
6423 - htab
->elf
.splt
->output_offset
6425 - abed
->plt0_got2_insn_end
),
6426 htab
->elf
.splt
->contents
6427 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
6432 if (htab
->plt_bnd
!= NULL
)
6433 elf_section_data (htab
->plt_bnd
->output_section
)
6434 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
6436 if (htab
->elf
.sgotplt
)
6438 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
6441 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
6445 /* Fill in the first three entries in the global offset table. */
6446 if (htab
->elf
.sgotplt
->size
> 0)
6448 /* Set the first entry in the global offset table to the address of
6449 the dynamic section. */
6451 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
6453 bfd_put_64 (output_bfd
,
6454 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
6455 htab
->elf
.sgotplt
->contents
);
6456 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
6457 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
6458 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
6461 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
6465 /* Adjust .eh_frame for .plt section. */
6466 if (htab
->plt_eh_frame
!= NULL
6467 && htab
->plt_eh_frame
->contents
!= NULL
)
6469 if (htab
->elf
.splt
!= NULL
6470 && htab
->elf
.splt
->size
!= 0
6471 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
6472 && htab
->elf
.splt
->output_section
!= NULL
6473 && htab
->plt_eh_frame
->output_section
!= NULL
)
6475 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
6476 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
6477 + htab
->plt_eh_frame
->output_offset
6478 + PLT_FDE_START_OFFSET
;
6479 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6480 htab
->plt_eh_frame
->contents
6481 + PLT_FDE_START_OFFSET
);
6483 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
6485 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6487 htab
->plt_eh_frame
->contents
))
6492 /* Adjust .eh_frame for .plt.got section. */
6493 if (htab
->plt_got_eh_frame
!= NULL
6494 && htab
->plt_got_eh_frame
->contents
!= NULL
)
6496 if (htab
->plt_got
!= NULL
6497 && htab
->plt_got
->size
!= 0
6498 && (htab
->plt_got
->flags
& SEC_EXCLUDE
) == 0
6499 && htab
->plt_got
->output_section
!= NULL
6500 && htab
->plt_got_eh_frame
->output_section
!= NULL
)
6502 bfd_vma plt_start
= htab
->plt_got
->output_section
->vma
;
6503 bfd_vma eh_frame_start
= htab
->plt_got_eh_frame
->output_section
->vma
6504 + htab
->plt_got_eh_frame
->output_offset
6505 + PLT_FDE_START_OFFSET
;
6506 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6507 htab
->plt_got_eh_frame
->contents
6508 + PLT_FDE_START_OFFSET
);
6510 if (htab
->plt_got_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
6512 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6513 htab
->plt_got_eh_frame
,
6514 htab
->plt_got_eh_frame
->contents
))
6519 /* Adjust .eh_frame for .plt.bnd section. */
6520 if (htab
->plt_bnd_eh_frame
!= NULL
6521 && htab
->plt_bnd_eh_frame
->contents
!= NULL
)
6523 if (htab
->plt_bnd
!= NULL
6524 && htab
->plt_bnd
->size
!= 0
6525 && (htab
->plt_bnd
->flags
& SEC_EXCLUDE
) == 0
6526 && htab
->plt_bnd
->output_section
!= NULL
6527 && htab
->plt_bnd_eh_frame
->output_section
!= NULL
)
6529 bfd_vma plt_start
= htab
->plt_bnd
->output_section
->vma
;
6530 bfd_vma eh_frame_start
= htab
->plt_bnd_eh_frame
->output_section
->vma
6531 + htab
->plt_bnd_eh_frame
->output_offset
6532 + PLT_FDE_START_OFFSET
;
6533 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6534 htab
->plt_bnd_eh_frame
->contents
6535 + PLT_FDE_START_OFFSET
);
6537 if (htab
->plt_bnd_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
6539 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6540 htab
->plt_bnd_eh_frame
,
6541 htab
->plt_bnd_eh_frame
->contents
))
6546 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
6547 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
6550 /* Fill PLT entries for undefined weak symbols in PIE. */
6551 if (bfd_link_pie (info
))
6552 bfd_hash_traverse (&info
->hash
->table
,
6553 elf_x86_64_pie_finish_undefweak_symbol
,
6559 /* Fill PLT/GOT entries and allocate dynamic relocations for local
6560 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6561 It has to be done before elf_link_sort_relocs is called so that
6562 dynamic relocations are properly sorted. */
6565 elf_x86_64_output_arch_local_syms
6566 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
6567 struct bfd_link_info
*info
,
6568 void *flaginfo ATTRIBUTE_UNUSED
,
6569 int (*func
) (void *, const char *,
6572 struct elf_link_hash_entry
*) ATTRIBUTE_UNUSED
)
6574 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
6578 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6579 htab_traverse (htab
->loc_hash_table
,
6580 elf_x86_64_finish_local_dynamic_symbol
,
6586 /* Return an array of PLT entry symbol values. */
6589 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
6592 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
6595 bfd_vma
*plt_sym_val
;
6597 bfd_byte
*plt_contents
;
6598 const struct elf_x86_64_backend_data
*bed
;
6599 Elf_Internal_Shdr
*hdr
;
6602 /* Get the .plt section contents. PLT passed down may point to the
6603 .plt.bnd section. Make sure that PLT always points to the .plt
6605 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6610 plt
= bfd_get_section_by_name (abfd
, ".plt");
6613 bed
= &elf_x86_64_bnd_arch_bed
;
6616 bed
= get_elf_x86_64_backend_data (abfd
);
6618 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
6619 if (plt_contents
== NULL
)
6621 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
6622 plt_contents
, 0, plt
->size
))
6625 free (plt_contents
);
6629 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
6630 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
6633 hdr
= &elf_section_data (relplt
)->this_hdr
;
6634 count
= relplt
->size
/ hdr
->sh_entsize
;
6636 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
6637 if (plt_sym_val
== NULL
)
6640 for (i
= 0; i
< count
; i
++)
6641 plt_sym_val
[i
] = -1;
6643 plt_offset
= bed
->plt_entry_size
;
6644 p
= relplt
->relocation
;
6645 for (i
= 0; i
< count
; i
++, p
++)
6649 /* Skip unknown relocation. */
6650 if (p
->howto
== NULL
)
6653 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
6654 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
6657 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
6658 + bed
->plt_reloc_offset
));
6659 if (reloc_index
< count
)
6663 /* This is the index in .plt section. */
6664 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
6665 /* Store VMA + the offset in .plt.bnd section. */
6666 plt_sym_val
[reloc_index
] =
6668 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
6671 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
6673 plt_offset
+= bed
->plt_entry_size
;
6675 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6677 if (plt_offset
>= plt
->size
)
6681 free (plt_contents
);
6686 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6690 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
6697 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6698 as PLT if it exists. */
6699 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6701 plt
= bfd_get_section_by_name (abfd
, ".plt");
6702 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
6703 dynsymcount
, dynsyms
, ret
,
6705 elf_x86_64_get_plt_sym_val
);
6708 /* Handle an x86-64 specific section when reading an object file. This
6709 is called when elfcode.h finds a section with an unknown type. */
6712 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
6713 const char *name
, int shindex
)
6715 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
6718 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
6724 /* Hook called by the linker routine which adds symbols from an object
6725 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6729 elf_x86_64_add_symbol_hook (bfd
*abfd
,
6730 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6731 Elf_Internal_Sym
*sym
,
6732 const char **namep ATTRIBUTE_UNUSED
,
6733 flagword
*flagsp ATTRIBUTE_UNUSED
,
6739 switch (sym
->st_shndx
)
6741 case SHN_X86_64_LCOMMON
:
6742 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
6745 lcomm
= bfd_make_section_with_flags (abfd
,
6749 | SEC_LINKER_CREATED
));
6752 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
6755 *valp
= sym
->st_size
;
6763 /* Given a BFD section, try to locate the corresponding ELF section
6767 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
6768 asection
*sec
, int *index_return
)
6770 if (sec
== &_bfd_elf_large_com_section
)
6772 *index_return
= SHN_X86_64_LCOMMON
;
6778 /* Process a symbol. */
6781 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
6784 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
6786 switch (elfsym
->internal_elf_sym
.st_shndx
)
6788 case SHN_X86_64_LCOMMON
:
6789 asym
->section
= &_bfd_elf_large_com_section
;
6790 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6791 /* Common symbol doesn't set BSF_GLOBAL. */
6792 asym
->flags
&= ~BSF_GLOBAL
;
6798 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6800 return (sym
->st_shndx
== SHN_COMMON
6801 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6805 elf_x86_64_common_section_index (asection
*sec
)
6807 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6810 return SHN_X86_64_LCOMMON
;
6814 elf_x86_64_common_section (asection
*sec
)
6816 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6817 return bfd_com_section_ptr
;
6819 return &_bfd_elf_large_com_section
;
6823 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6824 const Elf_Internal_Sym
*sym
,
6829 const asection
*oldsec
)
6831 /* A normal common symbol and a large common symbol result in a
6832 normal common symbol. We turn the large common symbol into a
6835 && h
->root
.type
== bfd_link_hash_common
6837 && bfd_is_com_section (*psec
)
6840 if (sym
->st_shndx
== SHN_COMMON
6841 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6843 h
->root
.u
.c
.p
->section
6844 = bfd_make_section_old_way (oldbfd
, "COMMON");
6845 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6847 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6848 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6849 *psec
= bfd_com_section_ptr
;
6856 elf_x86_64_additional_program_headers (bfd
*abfd
,
6857 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6862 /* Check to see if we need a large readonly segment. */
6863 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6864 if (s
&& (s
->flags
& SEC_LOAD
))
6867 /* Check to see if we need a large data segment. Since .lbss sections
6868 is placed right after the .bss section, there should be no need for
6869 a large data segment just because of .lbss. */
6870 s
= bfd_get_section_by_name (abfd
, ".ldata");
6871 if (s
&& (s
->flags
& SEC_LOAD
))
6877 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6880 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6882 if (h
->plt
.offset
!= (bfd_vma
) -1
6884 && !h
->pointer_equality_needed
)
6887 return _bfd_elf_hash_symbol (h
);
6890 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6893 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6894 const bfd_target
*output
)
6896 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6897 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6898 && _bfd_elf_relocs_compatible (input
, output
));
6901 /* Parse x86-64 GNU properties. */
6903 static enum elf_property_kind
6904 elf_x86_64_parse_gnu_properties (bfd
*abfd
, unsigned int type
,
6905 bfd_byte
*ptr
, unsigned int datasz
)
6911 case GNU_PROPERTY_X86_ISA_1_USED
:
6912 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
6916 ((type
== GNU_PROPERTY_X86_ISA_1_USED
6917 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6918 : _("error: %B: <corrupt x86 ISA needed size: 0x%x>")),
6920 return property_corrupt
;
6922 prop
= _bfd_elf_get_property (abfd
, type
, datasz
);
6923 prop
->u
.number
= bfd_h_get_32 (abfd
, ptr
);
6924 prop
->pr_kind
= property_number
;
6928 return property_ignored
;
6931 return property_number
;
6934 /* Merge x86-64 GNU property BPROP with APROP. If APROP isn't NULL,
6935 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6936 should be merged with ABFD. */
6939 elf_x86_64_merge_gnu_properties (bfd
*abfd ATTRIBUTE_UNUSED
,
6940 elf_property
*aprop
,
6941 elf_property
*bprop
)
6943 unsigned int number
;
6944 bfd_boolean updated
= FALSE
;
6945 unsigned int pr_type
= aprop
!= NULL
? aprop
->pr_type
: bprop
->pr_type
;
6949 case GNU_PROPERTY_X86_ISA_1_USED
:
6950 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
6951 if (aprop
!= NULL
&& bprop
!= NULL
)
6953 number
= aprop
->u
.number
;
6954 aprop
->u
.number
= number
| bprop
->u
.number
;
6955 updated
= number
!= (unsigned int) aprop
->u
.number
;
6959 /* Return TRUE if APROP is NULL to indicate that BPROP should
6960 be added to ABFD. */
6961 updated
= aprop
== NULL
;
6966 /* Never should happen. */
6973 static const struct bfd_elf_special_section
6974 elf_x86_64_special_sections
[]=
6976 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6977 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6978 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6979 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6980 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6981 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6982 { NULL
, 0, 0, 0, 0 }
6985 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6986 #define TARGET_LITTLE_NAME "elf64-x86-64"
6987 #define ELF_ARCH bfd_arch_i386
6988 #define ELF_TARGET_ID X86_64_ELF_DATA
6989 #define ELF_MACHINE_CODE EM_X86_64
6990 #define ELF_MAXPAGESIZE 0x200000
6991 #define ELF_MINPAGESIZE 0x1000
6992 #define ELF_COMMONPAGESIZE 0x1000
6994 #define elf_backend_can_gc_sections 1
6995 #define elf_backend_can_refcount 1
6996 #define elf_backend_want_got_plt 1
6997 #define elf_backend_plt_readonly 1
6998 #define elf_backend_want_plt_sym 0
6999 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
7000 #define elf_backend_rela_normal 1
7001 #define elf_backend_plt_alignment 4
7002 #define elf_backend_extern_protected_data 1
7003 #define elf_backend_caches_rawsize 1
7004 #define elf_backend_dtrel_excludes_plt 1
7005 #define elf_backend_want_dynrelro 1
7007 #define elf_info_to_howto elf_x86_64_info_to_howto
7009 #define bfd_elf64_bfd_link_hash_table_create \
7010 elf_x86_64_link_hash_table_create
7011 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
7012 #define bfd_elf64_bfd_reloc_name_lookup \
7013 elf_x86_64_reloc_name_lookup
7015 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
7016 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
7017 #define elf_backend_check_relocs elf_x86_64_check_relocs
7018 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
7019 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
7020 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
7021 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
7022 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
7023 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
7024 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
7025 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
7027 #define elf_backend_write_core_note elf_x86_64_write_core_note
7029 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
7030 #define elf_backend_relocate_section elf_x86_64_relocate_section
7031 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
7032 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
7033 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
7034 #define elf_backend_object_p elf64_x86_64_elf_object_p
7035 #define bfd_elf64_mkobject elf_x86_64_mkobject
7036 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
7038 #define elf_backend_section_from_shdr \
7039 elf_x86_64_section_from_shdr
7041 #define elf_backend_section_from_bfd_section \
7042 elf_x86_64_elf_section_from_bfd_section
7043 #define elf_backend_add_symbol_hook \
7044 elf_x86_64_add_symbol_hook
7045 #define elf_backend_symbol_processing \
7046 elf_x86_64_symbol_processing
7047 #define elf_backend_common_section_index \
7048 elf_x86_64_common_section_index
7049 #define elf_backend_common_section \
7050 elf_x86_64_common_section
7051 #define elf_backend_common_definition \
7052 elf_x86_64_common_definition
7053 #define elf_backend_merge_symbol \
7054 elf_x86_64_merge_symbol
7055 #define elf_backend_special_sections \
7056 elf_x86_64_special_sections
7057 #define elf_backend_additional_program_headers \
7058 elf_x86_64_additional_program_headers
7059 #define elf_backend_hash_symbol \
7060 elf_x86_64_hash_symbol
7061 #define elf_backend_omit_section_dynsym \
7062 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
7063 #define elf_backend_fixup_symbol \
7064 elf_x86_64_fixup_symbol
7065 #define elf_backend_parse_gnu_properties \
7066 elf_x86_64_parse_gnu_properties
7067 #define elf_backend_merge_gnu_properties \
7068 elf_x86_64_merge_gnu_properties
7070 #include "elf64-target.h"
7072 /* CloudABI support. */
7074 #undef TARGET_LITTLE_SYM
7075 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
7076 #undef TARGET_LITTLE_NAME
7077 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
7080 #define ELF_OSABI ELFOSABI_CLOUDABI
7083 #define elf64_bed elf64_x86_64_cloudabi_bed
7085 #include "elf64-target.h"
7087 /* FreeBSD support. */
7089 #undef TARGET_LITTLE_SYM
7090 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
7091 #undef TARGET_LITTLE_NAME
7092 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
7095 #define ELF_OSABI ELFOSABI_FREEBSD
7098 #define elf64_bed elf64_x86_64_fbsd_bed
7100 #include "elf64-target.h"
7102 /* Solaris 2 support. */
7104 #undef TARGET_LITTLE_SYM
7105 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
7106 #undef TARGET_LITTLE_NAME
7107 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
7109 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
7110 objects won't be recognized. */
7114 #define elf64_bed elf64_x86_64_sol2_bed
7116 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
7118 #undef elf_backend_static_tls_alignment
7119 #define elf_backend_static_tls_alignment 16
7121 /* The Solaris 2 ABI requires a plt symbol on all platforms.
7123 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
7125 #undef elf_backend_want_plt_sym
7126 #define elf_backend_want_plt_sym 1
7128 #undef elf_backend_strtab_flags
7129 #define elf_backend_strtab_flags SHF_STRINGS
7132 elf64_x86_64_copy_solaris_special_section_fields (const bfd
*ibfd ATTRIBUTE_UNUSED
,
7133 bfd
*obfd ATTRIBUTE_UNUSED
,
7134 const Elf_Internal_Shdr
*isection ATTRIBUTE_UNUSED
,
7135 Elf_Internal_Shdr
*osection ATTRIBUTE_UNUSED
)
7137 /* PR 19938: FIXME: Need to add code for setting the sh_info
7138 and sh_link fields of Solaris specific section types. */
7142 #undef elf_backend_copy_special_section_fields
7143 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
7145 #include "elf64-target.h"
7147 /* Native Client support. */
7150 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
7152 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
7153 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
7157 #undef TARGET_LITTLE_SYM
7158 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
7159 #undef TARGET_LITTLE_NAME
7160 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
7162 #define elf64_bed elf64_x86_64_nacl_bed
7164 #undef ELF_MAXPAGESIZE
7165 #undef ELF_MINPAGESIZE
7166 #undef ELF_COMMONPAGESIZE
7167 #define ELF_MAXPAGESIZE 0x10000
7168 #define ELF_MINPAGESIZE 0x10000
7169 #define ELF_COMMONPAGESIZE 0x10000
7171 /* Restore defaults. */
7173 #undef elf_backend_static_tls_alignment
7174 #undef elf_backend_want_plt_sym
7175 #define elf_backend_want_plt_sym 0
7176 #undef elf_backend_strtab_flags
7177 #undef elf_backend_copy_special_section_fields
7179 /* NaCl uses substantially different PLT entries for the same effects. */
7181 #undef elf_backend_plt_alignment
7182 #define elf_backend_plt_alignment 5
7183 #define NACL_PLT_ENTRY_SIZE 64
7184 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
7186 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
7188 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
7189 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
7190 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
7191 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7192 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7194 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
7195 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
7197 /* 32 bytes of nop to pad out to the standard size. */
7198 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7199 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7200 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7201 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7202 0x66, /* excess data16 prefix */
7206 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
7208 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
7209 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
7210 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7211 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7213 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
7214 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7215 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7217 /* Lazy GOT entries point here (32-byte aligned). */
7218 0x68, /* pushq immediate */
7219 0, 0, 0, 0, /* replaced with index into relocation table. */
7220 0xe9, /* jmp relative */
7221 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
7223 /* 22 bytes of nop to pad out to the standard size. */
7224 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7225 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7226 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
7229 /* .eh_frame covering the .plt section. */
7231 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
7233 #if (PLT_CIE_LENGTH != 20 \
7234 || PLT_FDE_LENGTH != 36 \
7235 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7236 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7237 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
7239 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
7240 0, 0, 0, 0, /* CIE ID */
7241 1, /* CIE version */
7242 'z', 'R', 0, /* Augmentation string */
7243 1, /* Code alignment factor */
7244 0x78, /* Data alignment factor */
7245 16, /* Return address column */
7246 1, /* Augmentation size */
7247 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
7248 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
7249 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
7250 DW_CFA_nop
, DW_CFA_nop
,
7252 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
7253 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
7254 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
7255 0, 0, 0, 0, /* .plt size goes here */
7256 0, /* Augmentation size */
7257 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
7258 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7259 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
7260 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7261 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
7262 13, /* Block length */
7263 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
7264 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
7265 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
7266 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
7267 DW_CFA_nop
, DW_CFA_nop
7270 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
7272 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
7273 elf_x86_64_nacl_plt_entry
, /* plt_entry */
7274 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
7275 2, /* plt0_got1_offset */
7276 9, /* plt0_got2_offset */
7277 13, /* plt0_got2_insn_end */
7278 3, /* plt_got_offset */
7279 33, /* plt_reloc_offset */
7280 38, /* plt_plt_offset */
7281 7, /* plt_got_insn_size */
7282 42, /* plt_plt_insn_end */
7283 32, /* plt_lazy_offset */
7284 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
7285 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
7286 NULL
, /* eh_frame_plt_got */
7287 0, /* eh_frame_plt_got_size */
7290 #undef elf_backend_arch_data
7291 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
7293 #undef elf_backend_object_p
7294 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
7295 #undef elf_backend_modify_segment_map
7296 #define elf_backend_modify_segment_map nacl_modify_segment_map
7297 #undef elf_backend_modify_program_headers
7298 #define elf_backend_modify_program_headers nacl_modify_program_headers
7299 #undef elf_backend_final_write_processing
7300 #define elf_backend_final_write_processing nacl_final_write_processing
7302 #include "elf64-target.h"
7304 /* Native Client x32 support. */
7307 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
7309 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
7310 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
7314 #undef TARGET_LITTLE_SYM
7315 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
7316 #undef TARGET_LITTLE_NAME
7317 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
7319 #define elf32_bed elf32_x86_64_nacl_bed
7321 #define bfd_elf32_bfd_link_hash_table_create \
7322 elf_x86_64_link_hash_table_create
7323 #define bfd_elf32_bfd_reloc_type_lookup \
7324 elf_x86_64_reloc_type_lookup
7325 #define bfd_elf32_bfd_reloc_name_lookup \
7326 elf_x86_64_reloc_name_lookup
7327 #define bfd_elf32_mkobject \
7329 #define bfd_elf32_get_synthetic_symtab \
7330 elf_x86_64_get_synthetic_symtab
7332 #undef elf_backend_object_p
7333 #define elf_backend_object_p \
7334 elf32_x86_64_nacl_elf_object_p
7336 #undef elf_backend_bfd_from_remote_memory
7337 #define elf_backend_bfd_from_remote_memory \
7338 _bfd_elf32_bfd_from_remote_memory
7340 #undef elf_backend_size_info
7341 #define elf_backend_size_info \
7342 _bfd_elf32_size_info
7344 #include "elf32-target.h"
7346 /* Restore defaults. */
7347 #undef elf_backend_object_p
7348 #define elf_backend_object_p elf64_x86_64_elf_object_p
7349 #undef elf_backend_bfd_from_remote_memory
7350 #undef elf_backend_size_info
7351 #undef elf_backend_modify_segment_map
7352 #undef elf_backend_modify_program_headers
7353 #undef elf_backend_final_write_processing
7355 /* Intel L1OM support. */
7358 elf64_l1om_elf_object_p (bfd
*abfd
)
7360 /* Set the right machine number for an L1OM elf64 file. */
7361 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
7365 #undef TARGET_LITTLE_SYM
7366 #define TARGET_LITTLE_SYM l1om_elf64_vec
7367 #undef TARGET_LITTLE_NAME
7368 #define TARGET_LITTLE_NAME "elf64-l1om"
7370 #define ELF_ARCH bfd_arch_l1om
7372 #undef ELF_MACHINE_CODE
7373 #define ELF_MACHINE_CODE EM_L1OM
7378 #define elf64_bed elf64_l1om_bed
7380 #undef elf_backend_object_p
7381 #define elf_backend_object_p elf64_l1om_elf_object_p
7383 /* Restore defaults. */
7384 #undef ELF_MAXPAGESIZE
7385 #undef ELF_MINPAGESIZE
7386 #undef ELF_COMMONPAGESIZE
7387 #define ELF_MAXPAGESIZE 0x200000
7388 #define ELF_MINPAGESIZE 0x1000
7389 #define ELF_COMMONPAGESIZE 0x1000
7390 #undef elf_backend_plt_alignment
7391 #define elf_backend_plt_alignment 4
7392 #undef elf_backend_arch_data
7393 #define elf_backend_arch_data &elf_x86_64_arch_bed
7395 #include "elf64-target.h"
7397 /* FreeBSD L1OM support. */
7399 #undef TARGET_LITTLE_SYM
7400 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
7401 #undef TARGET_LITTLE_NAME
7402 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
7405 #define ELF_OSABI ELFOSABI_FREEBSD
7408 #define elf64_bed elf64_l1om_fbsd_bed
7410 #include "elf64-target.h"
7412 /* Intel K1OM support. */
7415 elf64_k1om_elf_object_p (bfd
*abfd
)
7417 /* Set the right machine number for an K1OM elf64 file. */
7418 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
7422 #undef TARGET_LITTLE_SYM
7423 #define TARGET_LITTLE_SYM k1om_elf64_vec
7424 #undef TARGET_LITTLE_NAME
7425 #define TARGET_LITTLE_NAME "elf64-k1om"
7427 #define ELF_ARCH bfd_arch_k1om
7429 #undef ELF_MACHINE_CODE
7430 #define ELF_MACHINE_CODE EM_K1OM
7435 #define elf64_bed elf64_k1om_bed
7437 #undef elf_backend_object_p
7438 #define elf_backend_object_p elf64_k1om_elf_object_p
7440 #undef elf_backend_static_tls_alignment
7442 #undef elf_backend_want_plt_sym
7443 #define elf_backend_want_plt_sym 0
7445 #include "elf64-target.h"
7447 /* FreeBSD K1OM support. */
7449 #undef TARGET_LITTLE_SYM
7450 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
7451 #undef TARGET_LITTLE_NAME
7452 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
7455 #define ELF_OSABI ELFOSABI_FREEBSD
7458 #define elf64_bed elf64_k1om_fbsd_bed
7460 #include "elf64-target.h"
7462 /* 32bit x86-64 support. */
7464 #undef TARGET_LITTLE_SYM
7465 #define TARGET_LITTLE_SYM x86_64_elf32_vec
7466 #undef TARGET_LITTLE_NAME
7467 #define TARGET_LITTLE_NAME "elf32-x86-64"
7471 #define ELF_ARCH bfd_arch_i386
7473 #undef ELF_MACHINE_CODE
7474 #define ELF_MACHINE_CODE EM_X86_64
7478 #undef elf_backend_object_p
7479 #define elf_backend_object_p \
7480 elf32_x86_64_elf_object_p
7482 #undef elf_backend_bfd_from_remote_memory
7483 #define elf_backend_bfd_from_remote_memory \
7484 _bfd_elf32_bfd_from_remote_memory
7486 #undef elf_backend_size_info
7487 #define elf_backend_size_info \
7488 _bfd_elf32_size_info
7490 #include "elf32-target.h"