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 GOT or PLT relocations. */
862 unsigned int has_got_reloc
: 1;
864 /* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
865 unsigned int has_non_got_reloc
: 1;
867 /* Don't call finish_dynamic_symbol on this symbol. */
868 unsigned int no_finish_dynamic_symbol
: 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 info>bndplt 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_got_reloc
= 0;
1023 eh
->has_non_got_reloc
= 0;
1024 eh
->no_finish_dynamic_symbol
= 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 (htab
->elf
.splt
!= NULL
)
1202 const struct elf_backend_data
*bed
1203 = get_elf_backend_data (dynobj
);
1204 flagword pltflags
= (bed
->dynamic_sec_flags
1210 if (htab
->plt_got
== NULL
1211 && get_elf_x86_64_backend_data (dynobj
) == &elf_x86_64_arch_bed
)
1213 /* Create the GOT procedure linkage table. */
1214 unsigned int plt_got_align
;
1216 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry
) == 8
1217 && (sizeof (elf_x86_64_bnd_plt2_entry
)
1218 == sizeof (elf_x86_64_legacy_plt2_entry
)));
1222 = bfd_make_section_anyway_with_flags (dynobj
,
1225 if (htab
->plt_got
== NULL
1226 || !bfd_set_section_alignment (dynobj
,
1232 /* MPX PLT is supported only if elf_x86_64_arch_bed is used in
1234 if (ABI_64_P (dynobj
)
1236 && get_elf_x86_64_backend_data (dynobj
) == &elf_x86_64_arch_bed
1237 && htab
->plt_bnd
== NULL
)
1239 /* Create the second PLT for Intel MPX support. */
1240 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
) == 8
1241 && (sizeof (elf_x86_64_bnd_plt2_entry
)
1242 == sizeof (elf_x86_64_legacy_plt2_entry
)));
1245 = bfd_make_section_anyway_with_flags (dynobj
,
1248 if (htab
->plt_bnd
== NULL
1249 || !bfd_set_section_alignment (dynobj
, htab
->plt_bnd
, 3))
1253 if (!info
->no_ld_generated_unwind_info
)
1255 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1256 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1257 | SEC_LINKER_CREATED
);
1259 if (htab
->plt_eh_frame
== NULL
)
1262 = bfd_make_section_anyway_with_flags (dynobj
,
1265 if (htab
->plt_eh_frame
== NULL
1266 || !bfd_set_section_alignment (dynobj
,
1268 ABI_64_P (dynobj
) ? 3 : 2))
1272 if (htab
->plt_got_eh_frame
== NULL
1273 && htab
->plt_got
!= NULL
)
1275 htab
->plt_got_eh_frame
1276 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1279 if (htab
->plt_got_eh_frame
== NULL
1280 || !bfd_set_section_alignment (dynobj
,
1281 htab
->plt_got_eh_frame
,
1282 ABI_64_P (dynobj
) ? 3 : 2))
1286 if (htab
->plt_bnd_eh_frame
== NULL
1287 && htab
->plt_bnd
!= NULL
)
1289 htab
->plt_bnd_eh_frame
1290 = bfd_make_section_anyway_with_flags (dynobj
,
1293 if (htab
->plt_bnd_eh_frame
== NULL
1294 || !bfd_set_section_alignment (dynobj
,
1295 htab
->plt_bnd_eh_frame
,
1302 /* Align .got section to its entry size. */
1303 if (htab
->elf
.sgot
!= NULL
1304 && !bfd_set_section_alignment (dynobj
, htab
->elf
.sgot
, 3))
1307 /* Align .got.plt section to its entry size. */
1308 if (htab
->elf
.sgotplt
!= NULL
1309 && !bfd_set_section_alignment (dynobj
, htab
->elf
.sgotplt
, 3))
1315 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1318 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1319 struct elf_link_hash_entry
*dir
,
1320 struct elf_link_hash_entry
*ind
)
1322 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1324 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1325 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1327 edir
->has_got_reloc
|= eind
->has_got_reloc
;
1328 edir
->has_non_got_reloc
|= eind
->has_non_got_reloc
;
1330 if (eind
->dyn_relocs
!= NULL
)
1332 if (edir
->dyn_relocs
!= NULL
)
1334 struct elf_dyn_relocs
**pp
;
1335 struct elf_dyn_relocs
*p
;
1337 /* Add reloc counts against the indirect sym to the direct sym
1338 list. Merge any entries against the same section. */
1339 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1341 struct elf_dyn_relocs
*q
;
1343 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1344 if (q
->sec
== p
->sec
)
1346 q
->pc_count
+= p
->pc_count
;
1347 q
->count
+= p
->count
;
1354 *pp
= edir
->dyn_relocs
;
1357 edir
->dyn_relocs
= eind
->dyn_relocs
;
1358 eind
->dyn_relocs
= NULL
;
1361 if (ind
->root
.type
== bfd_link_hash_indirect
1362 && dir
->got
.refcount
<= 0)
1364 edir
->tls_type
= eind
->tls_type
;
1365 eind
->tls_type
= GOT_UNKNOWN
;
1368 if (ELIMINATE_COPY_RELOCS
1369 && ind
->root
.type
!= bfd_link_hash_indirect
1370 && dir
->dynamic_adjusted
)
1372 /* If called to transfer flags for a weakdef during processing
1373 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1374 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1375 if (dir
->versioned
!= versioned_hidden
)
1376 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1377 dir
->ref_regular
|= ind
->ref_regular
;
1378 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1379 dir
->needs_plt
|= ind
->needs_plt
;
1380 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1384 if (eind
->func_pointer_refcount
> 0)
1386 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1387 eind
->func_pointer_refcount
= 0;
1390 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1395 elf64_x86_64_elf_object_p (bfd
*abfd
)
1397 /* Set the right machine number for an x86-64 elf64 file. */
1398 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1403 elf32_x86_64_elf_object_p (bfd
*abfd
)
1405 /* Set the right machine number for an x86-64 elf32 file. */
1406 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1410 /* Return TRUE if the TLS access code sequence support transition
1414 elf_x86_64_check_tls_transition (bfd
*abfd
,
1415 struct bfd_link_info
*info
,
1418 Elf_Internal_Shdr
*symtab_hdr
,
1419 struct elf_link_hash_entry
**sym_hashes
,
1420 unsigned int r_type
,
1421 const Elf_Internal_Rela
*rel
,
1422 const Elf_Internal_Rela
*relend
)
1425 unsigned long r_symndx
;
1426 bfd_boolean largepic
= FALSE
;
1427 struct elf_link_hash_entry
*h
;
1429 struct elf_x86_64_link_hash_table
*htab
;
1431 bfd_boolean indirect_call
, tls_get_addr
;
1433 htab
= elf_x86_64_hash_table (info
);
1434 offset
= rel
->r_offset
;
1437 case R_X86_64_TLSGD
:
1438 case R_X86_64_TLSLD
:
1439 if ((rel
+ 1) >= relend
)
1442 if (r_type
== R_X86_64_TLSGD
)
1444 /* Check transition from GD access model. For 64bit, only
1445 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1446 .word 0x6666; rex64; call __tls_get_addr@PLT
1448 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1450 call *__tls_get_addr@GOTPCREL(%rip)
1451 which may be converted to
1452 addr32 call __tls_get_addr
1453 can transit to different access model. For 32bit, only
1454 leaq foo@tlsgd(%rip), %rdi
1455 .word 0x6666; rex64; call __tls_get_addr@PLT
1457 leaq foo@tlsgd(%rip), %rdi
1459 call *__tls_get_addr@GOTPCREL(%rip)
1460 which may be converted to
1461 addr32 call __tls_get_addr
1462 can transit to different access model. For largepic,
1464 leaq foo@tlsgd(%rip), %rdi
1465 movabsq $__tls_get_addr@pltoff, %rax
1469 leaq foo@tlsgd(%rip), %rdi
1470 movabsq $__tls_get_addr@pltoff, %rax
1474 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1476 if ((offset
+ 12) > sec
->size
)
1479 call
= contents
+ offset
+ 4;
1481 || !((call
[1] == 0x48
1489 && call
[3] == 0xe8)))
1491 if (!ABI_64_P (abfd
)
1492 || (offset
+ 19) > sec
->size
1494 || memcmp (call
- 7, leaq
+ 1, 3) != 0
1495 || memcmp (call
, "\x48\xb8", 2) != 0
1499 || !((call
[10] == 0x48 && call
[12] == 0xd8)
1500 || (call
[10] == 0x4c && call
[12] == 0xf8)))
1504 else if (ABI_64_P (abfd
))
1507 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1513 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1516 indirect_call
= call
[2] == 0xff;
1520 /* Check transition from LD access model. Only
1521 leaq foo@tlsld(%rip), %rdi;
1522 call __tls_get_addr@PLT
1524 leaq foo@tlsld(%rip), %rdi;
1525 call *__tls_get_addr@GOTPCREL(%rip)
1526 which may be converted to
1527 addr32 call __tls_get_addr
1528 can transit to different access model. For largepic
1530 leaq foo@tlsld(%rip), %rdi
1531 movabsq $__tls_get_addr@pltoff, %rax
1535 leaq foo@tlsld(%rip), %rdi
1536 movabsq $__tls_get_addr@pltoff, %rax
1540 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1542 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1545 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1548 call
= contents
+ offset
+ 4;
1549 if (!(call
[0] == 0xe8
1550 || (call
[0] == 0xff && call
[1] == 0x15)
1551 || (call
[0] == 0x67 && call
[1] == 0xe8)))
1553 if (!ABI_64_P (abfd
)
1554 || (offset
+ 19) > sec
->size
1555 || memcmp (call
, "\x48\xb8", 2) != 0
1559 || !((call
[10] == 0x48 && call
[12] == 0xd8)
1560 || (call
[10] == 0x4c && call
[12] == 0xf8)))
1564 indirect_call
= call
[0] == 0xff;
1567 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1568 if (r_symndx
< symtab_hdr
->sh_info
)
1571 tls_get_addr
= FALSE
;
1572 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1573 if (h
!= NULL
&& h
->root
.root
.string
!= NULL
)
1575 struct elf_x86_64_link_hash_entry
*eh
1576 = (struct elf_x86_64_link_hash_entry
*) h
;
1577 tls_get_addr
= eh
->tls_get_addr
== 1;
1578 if (eh
->tls_get_addr
> 1)
1580 /* Use strncmp to check __tls_get_addr since
1581 __tls_get_addr may be versioned. */
1582 if (strncmp (h
->root
.root
.string
, "__tls_get_addr", 14)
1585 eh
->tls_get_addr
= 1;
1586 tls_get_addr
= TRUE
;
1589 eh
->tls_get_addr
= 0;
1596 return ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
;
1597 else if (indirect_call
)
1598 return ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_GOTPCRELX
;
1600 return (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1601 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
);
1603 case R_X86_64_GOTTPOFF
:
1604 /* Check transition from IE access model:
1605 mov foo@gottpoff(%rip), %reg
1606 add foo@gottpoff(%rip), %reg
1609 /* Check REX prefix first. */
1610 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1612 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1613 if (val
!= 0x48 && val
!= 0x4c)
1615 /* X32 may have 0x44 REX prefix or no REX prefix. */
1616 if (ABI_64_P (abfd
))
1622 /* X32 may not have any REX prefix. */
1623 if (ABI_64_P (abfd
))
1625 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1629 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1630 if (val
!= 0x8b && val
!= 0x03)
1633 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1634 return (val
& 0xc7) == 5;
1636 case R_X86_64_GOTPC32_TLSDESC
:
1637 /* Check transition from GDesc access model:
1638 leaq x@tlsdesc(%rip), %rax
1640 Make sure it's a leaq adding rip to a 32-bit offset
1641 into any register, although it's probably almost always
1644 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1647 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1648 if ((val
& 0xfb) != 0x48)
1651 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1654 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1655 return (val
& 0xc7) == 0x05;
1657 case R_X86_64_TLSDESC_CALL
:
1658 /* Check transition from GDesc access model:
1659 call *x@tlsdesc(%rax)
1661 if (offset
+ 2 <= sec
->size
)
1663 /* Make sure that it's a call *x@tlsdesc(%rax). */
1664 call
= contents
+ offset
;
1665 return call
[0] == 0xff && call
[1] == 0x10;
1675 /* Return TRUE if the TLS access transition is OK or no transition
1676 will be performed. Update R_TYPE if there is a transition. */
1679 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1680 asection
*sec
, bfd_byte
*contents
,
1681 Elf_Internal_Shdr
*symtab_hdr
,
1682 struct elf_link_hash_entry
**sym_hashes
,
1683 unsigned int *r_type
, int tls_type
,
1684 const Elf_Internal_Rela
*rel
,
1685 const Elf_Internal_Rela
*relend
,
1686 struct elf_link_hash_entry
*h
,
1687 unsigned long r_symndx
,
1688 bfd_boolean from_relocate_section
)
1690 unsigned int from_type
= *r_type
;
1691 unsigned int to_type
= from_type
;
1692 bfd_boolean check
= TRUE
;
1694 /* Skip TLS transition for functions. */
1696 && (h
->type
== STT_FUNC
1697 || h
->type
== STT_GNU_IFUNC
))
1702 case R_X86_64_TLSGD
:
1703 case R_X86_64_GOTPC32_TLSDESC
:
1704 case R_X86_64_TLSDESC_CALL
:
1705 case R_X86_64_GOTTPOFF
:
1706 if (bfd_link_executable (info
))
1709 to_type
= R_X86_64_TPOFF32
;
1711 to_type
= R_X86_64_GOTTPOFF
;
1714 /* When we are called from elf_x86_64_relocate_section, there may
1715 be additional transitions based on TLS_TYPE. */
1716 if (from_relocate_section
)
1718 unsigned int new_to_type
= to_type
;
1720 if (bfd_link_executable (info
)
1723 && tls_type
== GOT_TLS_IE
)
1724 new_to_type
= R_X86_64_TPOFF32
;
1726 if (to_type
== R_X86_64_TLSGD
1727 || to_type
== R_X86_64_GOTPC32_TLSDESC
1728 || to_type
== R_X86_64_TLSDESC_CALL
)
1730 if (tls_type
== GOT_TLS_IE
)
1731 new_to_type
= R_X86_64_GOTTPOFF
;
1734 /* We checked the transition before when we were called from
1735 elf_x86_64_check_relocs. We only want to check the new
1736 transition which hasn't been checked before. */
1737 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1738 to_type
= new_to_type
;
1743 case R_X86_64_TLSLD
:
1744 if (bfd_link_executable (info
))
1745 to_type
= R_X86_64_TPOFF32
;
1752 /* Return TRUE if there is no transition. */
1753 if (from_type
== to_type
)
1756 /* Check if the transition can be performed. */
1758 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1759 symtab_hdr
, sym_hashes
,
1760 from_type
, rel
, relend
))
1762 reloc_howto_type
*from
, *to
;
1765 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1766 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1769 name
= h
->root
.root
.string
;
1772 struct elf_x86_64_link_hash_table
*htab
;
1774 htab
= elf_x86_64_hash_table (info
);
1779 Elf_Internal_Sym
*isym
;
1781 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1783 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1788 /* xgettext:c-format */
1789 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1790 "in section `%A' failed"),
1791 abfd
, from
->name
, to
->name
, name
,
1792 (unsigned long) rel
->r_offset
, sec
);
1793 bfd_set_error (bfd_error_bad_value
);
1801 /* Rename some of the generic section flags to better document how they
1803 #define need_convert_load sec_flg0
1804 #define check_relocs_failed sec_flg1
1807 elf_x86_64_need_pic (bfd
*input_bfd
, asection
*sec
,
1808 struct elf_link_hash_entry
*h
,
1809 Elf_Internal_Shdr
*symtab_hdr
,
1810 Elf_Internal_Sym
*isym
,
1811 reloc_howto_type
*howto
)
1814 const char *und
= "";
1815 const char *pic
= "";
1820 name
= h
->root
.root
.string
;
1821 switch (ELF_ST_VISIBILITY (h
->other
))
1824 v
= _("hidden symbol ");
1827 v
= _("internal symbol ");
1830 v
= _("protected symbol ");
1834 pic
= _("; recompile with -fPIC");
1838 if (!h
->def_regular
&& !h
->def_dynamic
)
1839 und
= _("undefined ");
1843 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, isym
, NULL
);
1844 pic
= _("; recompile with -fPIC");
1847 /* xgettext:c-format */
1848 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1849 "not be used when making a shared object%s"),
1850 input_bfd
, howto
->name
, und
, v
, name
, pic
);
1851 bfd_set_error (bfd_error_bad_value
);
1852 sec
->check_relocs_failed
= 1;
1856 /* With the local symbol, foo, we convert
1857 mov foo@GOTPCREL(%rip), %reg
1861 call/jmp *foo@GOTPCREL(%rip)
1863 nop call foo/jmp foo nop
1864 When PIC is false, convert
1865 test %reg, foo@GOTPCREL(%rip)
1869 binop foo@GOTPCREL(%rip), %reg
1872 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1876 elf_x86_64_convert_load_reloc (bfd
*abfd
, asection
*sec
,
1878 Elf_Internal_Rela
*irel
,
1879 struct elf_link_hash_entry
*h
,
1880 bfd_boolean
*converted
,
1881 struct bfd_link_info
*link_info
)
1883 struct elf_x86_64_link_hash_table
*htab
;
1885 bfd_boolean require_reloc_pc32
;
1887 bfd_boolean to_reloc_pc32
;
1890 bfd_signed_vma raddend
;
1891 unsigned int opcode
;
1893 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
1894 unsigned int r_symndx
;
1896 bfd_vma roff
= irel
->r_offset
;
1898 if (roff
< (r_type
== R_X86_64_REX_GOTPCRELX
? 3 : 2))
1901 raddend
= irel
->r_addend
;
1902 /* Addend for 32-bit PC-relative relocation must be -4. */
1906 htab
= elf_x86_64_hash_table (link_info
);
1907 is_pic
= bfd_link_pic (link_info
);
1909 relocx
= (r_type
== R_X86_64_GOTPCRELX
1910 || r_type
== R_X86_64_REX_GOTPCRELX
);
1912 /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
1915 = link_info
->disable_target_specific_optimizations
> 1;
1917 r_symndx
= htab
->r_sym (irel
->r_info
);
1919 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
1921 /* Convert mov to lea since it has been done for a while. */
1924 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1925 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1926 test, xor instructions. */
1931 /* We convert only to R_X86_64_PC32:
1933 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1934 3. require_reloc_pc32 is true.
1937 to_reloc_pc32
= (opcode
== 0xff
1939 || require_reloc_pc32
1942 /* Get the symbol referred to by the reloc. */
1945 Elf_Internal_Sym
*isym
1946 = bfd_sym_from_r_symndx (&htab
->sym_cache
, abfd
, r_symndx
);
1948 /* Skip relocation against undefined symbols. */
1949 if (isym
->st_shndx
== SHN_UNDEF
)
1952 symtype
= ELF_ST_TYPE (isym
->st_info
);
1954 if (isym
->st_shndx
== SHN_ABS
)
1955 tsec
= bfd_abs_section_ptr
;
1956 else if (isym
->st_shndx
== SHN_COMMON
)
1957 tsec
= bfd_com_section_ptr
;
1958 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
1959 tsec
= &_bfd_elf_large_com_section
;
1961 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1963 toff
= isym
->st_value
;
1967 /* Undefined weak symbol is only bound locally in executable
1968 and its reference is resolved as 0 without relocation
1969 overflow. We can only perform this optimization for
1970 GOTPCRELX relocations since we need to modify REX byte.
1971 It is OK convert mov with R_X86_64_GOTPCREL to
1973 if ((relocx
|| opcode
== 0x8b)
1974 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info
,
1976 elf_x86_64_hash_entry (h
)))
1980 /* Skip for branch instructions since R_X86_64_PC32
1982 if (require_reloc_pc32
)
1987 /* For non-branch instructions, we can convert to
1988 R_X86_64_32/R_X86_64_32S since we know if there
1990 to_reloc_pc32
= FALSE
;
1993 /* Since we don't know the current PC when PIC is true,
1994 we can't convert to R_X86_64_PC32. */
1995 if (to_reloc_pc32
&& is_pic
)
2000 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
2001 ld.so may use its link-time address. */
2002 else if ((h
->def_regular
2003 || h
->root
.type
== bfd_link_hash_defined
2004 || h
->root
.type
== bfd_link_hash_defweak
)
2005 && h
!= htab
->elf
.hdynamic
2006 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
2008 /* bfd_link_hash_new or bfd_link_hash_undefined is
2009 set by an assignment in a linker script in
2010 bfd_elf_record_link_assignment. */
2012 && (h
->root
.type
== bfd_link_hash_new
2013 || h
->root
.type
== bfd_link_hash_undefined
2014 || ((h
->root
.type
== bfd_link_hash_defined
2015 || h
->root
.type
== bfd_link_hash_defweak
)
2016 && h
->root
.u
.def
.section
== bfd_und_section_ptr
)))
2018 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
2019 if (require_reloc_pc32
)
2023 tsec
= h
->root
.u
.def
.section
;
2024 toff
= h
->root
.u
.def
.value
;
2031 /* Don't convert GOTPCREL relocation against large section. */
2032 if (elf_section_data (tsec
) != NULL
2033 && (elf_section_flags (tsec
) & SHF_X86_64_LARGE
) != 0)
2036 /* We can only estimate relocation overflow for R_X86_64_PC32. */
2040 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
2042 /* At this stage in linking, no SEC_MERGE symbol has been
2043 adjusted, so all references to such symbols need to be
2044 passed through _bfd_merged_section_offset. (Later, in
2045 relocate_section, all SEC_MERGE symbols *except* for
2046 section symbols have been adjusted.)
2048 gas may reduce relocations against symbols in SEC_MERGE
2049 sections to a relocation against the section symbol when
2050 the original addend was zero. When the reloc is against
2051 a section symbol we should include the addend in the
2052 offset passed to _bfd_merged_section_offset, since the
2053 location of interest is the original symbol. On the
2054 other hand, an access to "sym+addend" where "sym" is not
2055 a section symbol should not include the addend; Such an
2056 access is presumed to be an offset from "sym"; The
2057 location of interest is just "sym". */
2058 if (symtype
== STT_SECTION
)
2061 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
2062 elf_section_data (tsec
)->sec_info
,
2065 if (symtype
!= STT_SECTION
)
2071 /* Don't convert if R_X86_64_PC32 relocation overflows. */
2072 if (tsec
->output_section
== sec
->output_section
)
2074 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
2079 bfd_signed_vma distance
;
2081 /* At this point, we don't know the load addresses of TSEC
2082 section nor SEC section. We estimate the distrance between
2083 SEC and TSEC. We store the estimated distances in the
2084 compressed_size field of the output section, which is only
2085 used to decompress the compressed input section. */
2086 if (sec
->output_section
->compressed_size
== 0)
2089 bfd_size_type size
= 0;
2090 for (asect
= link_info
->output_bfd
->sections
;
2092 asect
= asect
->next
)
2093 /* Skip debug sections since compressed_size is used to
2094 compress debug sections. */
2095 if ((asect
->flags
& SEC_DEBUGGING
) == 0)
2098 for (i
= asect
->map_head
.s
;
2102 size
= align_power (size
, i
->alignment_power
);
2105 asect
->compressed_size
= size
;
2109 /* Don't convert GOTPCREL relocations if TSEC isn't placed
2111 distance
= (tsec
->output_section
->compressed_size
2112 - sec
->output_section
->compressed_size
);
2116 /* Take PT_GNU_RELRO segment into account by adding
2118 if ((toff
+ distance
+ get_elf_backend_data (abfd
)->maxpagesize
2119 - roff
+ 0x80000000) > 0xffffffff)
2126 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
2131 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
2133 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
2136 /* Convert to "jmp foo nop". */
2139 nop_offset
= irel
->r_offset
+ 3;
2140 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
2141 irel
->r_offset
-= 1;
2142 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
2146 struct elf_x86_64_link_hash_entry
*eh
2147 = (struct elf_x86_64_link_hash_entry
*) h
;
2149 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2152 /* To support TLS optimization, always use addr32 prefix for
2153 "call *__tls_get_addr@GOTPCREL(%rip)". */
2154 if (eh
&& eh
->tls_get_addr
== 1)
2157 nop_offset
= irel
->r_offset
- 2;
2161 nop
= link_info
->call_nop_byte
;
2162 if (link_info
->call_nop_as_suffix
)
2164 nop_offset
= irel
->r_offset
+ 3;
2165 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
2166 irel
->r_offset
-= 1;
2167 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
2170 nop_offset
= irel
->r_offset
- 2;
2173 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
2174 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
2175 r_type
= R_X86_64_PC32
;
2180 unsigned int rex_mask
= REX_R
;
2182 if (r_type
== R_X86_64_REX_GOTPCRELX
)
2183 rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
2191 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2192 "lea foo(%rip), %reg". */
2194 r_type
= R_X86_64_PC32
;
2198 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2199 "mov $foo, %reg". */
2201 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
2202 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
2203 if ((rex
& REX_W
) != 0
2204 && ABI_64_P (link_info
->output_bfd
))
2206 /* Keep the REX_W bit in REX byte for LP64. */
2207 r_type
= R_X86_64_32S
;
2208 goto rewrite_modrm_rex
;
2212 /* If the REX_W bit in REX byte isn't needed,
2213 use R_X86_64_32 and clear the W bit to avoid
2214 sign-extend imm32 to imm64. */
2215 r_type
= R_X86_64_32
;
2216 /* Clear the W bit in REX byte. */
2218 goto rewrite_modrm_rex
;
2224 /* R_X86_64_PC32 isn't supported. */
2228 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
2231 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
2232 "test $foo, %reg". */
2233 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
2238 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
2239 "binop $foo, %reg". */
2240 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
2244 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
2245 overflow when sign-extending imm32 to imm64. */
2246 r_type
= (rex
& REX_W
) != 0 ? R_X86_64_32S
: R_X86_64_32
;
2249 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
2253 /* Move the R bit to the B bit in REX byte. */
2254 rex
= (rex
& ~rex_mask
) | (rex
& REX_R
) >> 2;
2255 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
2258 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
2262 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
2265 irel
->r_info
= htab
->r_info (r_symndx
, r_type
);
2272 /* Look through the relocs for a section during the first phase, and
2273 calculate needed space in the global offset table, procedure
2274 linkage table, and dynamic reloc sections. */
2277 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
2279 const Elf_Internal_Rela
*relocs
)
2281 struct elf_x86_64_link_hash_table
*htab
;
2282 Elf_Internal_Shdr
*symtab_hdr
;
2283 struct elf_link_hash_entry
**sym_hashes
;
2284 const Elf_Internal_Rela
*rel
;
2285 const Elf_Internal_Rela
*rel_end
;
2289 if (bfd_link_relocatable (info
))
2292 /* Don't do anything special with non-loaded, non-alloced sections.
2293 In particular, any relocs in such sections should not affect GOT
2294 and PLT reference counting (ie. we don't allow them to create GOT
2295 or PLT entries), there's no possibility or desire to optimize TLS
2296 relocs, and there's not much point in propagating relocs to shared
2297 libs that the dynamic linker won't relocate. */
2298 if ((sec
->flags
& SEC_ALLOC
) == 0)
2301 BFD_ASSERT (is_x86_64_elf (abfd
));
2303 htab
= elf_x86_64_hash_table (info
);
2306 sec
->check_relocs_failed
= 1;
2310 /* Get the section contents. */
2311 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
2312 contents
= elf_section_data (sec
)->this_hdr
.contents
;
2313 else if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
2315 sec
->check_relocs_failed
= 1;
2319 symtab_hdr
= &elf_symtab_hdr (abfd
);
2320 sym_hashes
= elf_sym_hashes (abfd
);
2324 rel_end
= relocs
+ sec
->reloc_count
;
2325 for (rel
= relocs
; rel
< rel_end
; rel
++)
2327 unsigned int r_type
;
2328 unsigned long r_symndx
;
2329 struct elf_link_hash_entry
*h
;
2330 struct elf_x86_64_link_hash_entry
*eh
;
2331 Elf_Internal_Sym
*isym
;
2333 bfd_boolean size_reloc
;
2335 r_symndx
= htab
->r_sym (rel
->r_info
);
2336 r_type
= ELF32_R_TYPE (rel
->r_info
);
2338 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
2340 /* xgettext:c-format */
2341 _bfd_error_handler (_("%B: bad symbol index: %d"),
2346 if (r_symndx
< symtab_hdr
->sh_info
)
2348 /* A local symbol. */
2349 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2354 /* Check relocation against local STT_GNU_IFUNC symbol. */
2355 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2357 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
2362 /* Fake a STT_GNU_IFUNC symbol. */
2363 h
->type
= STT_GNU_IFUNC
;
2366 h
->forced_local
= 1;
2367 h
->root
.type
= bfd_link_hash_defined
;
2375 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2376 while (h
->root
.type
== bfd_link_hash_indirect
2377 || h
->root
.type
== bfd_link_hash_warning
)
2378 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2381 /* Check invalid x32 relocations. */
2382 if (!ABI_64_P (abfd
))
2388 case R_X86_64_DTPOFF64
:
2389 case R_X86_64_TPOFF64
:
2391 case R_X86_64_GOTOFF64
:
2392 case R_X86_64_GOT64
:
2393 case R_X86_64_GOTPCREL64
:
2394 case R_X86_64_GOTPC64
:
2395 case R_X86_64_GOTPLT64
:
2396 case R_X86_64_PLTOFF64
:
2399 name
= h
->root
.root
.string
;
2401 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
2404 /* xgettext:c-format */
2405 (_("%B: relocation %s against symbol `%s' isn't "
2406 "supported in x32 mode"), abfd
,
2407 x86_64_elf_howto_table
[r_type
].name
, name
);
2408 bfd_set_error (bfd_error_bad_value
);
2421 case R_X86_64_PC32_BND
:
2422 case R_X86_64_PLT32_BND
:
2424 case R_X86_64_PLT32
:
2429 case R_X86_64_GOTPCREL
:
2430 case R_X86_64_GOTPCRELX
:
2431 case R_X86_64_REX_GOTPCRELX
:
2432 case R_X86_64_GOTPCREL64
:
2433 if (htab
->elf
.dynobj
== NULL
)
2434 htab
->elf
.dynobj
= abfd
;
2435 /* Create the ifunc sections for static executables. */
2436 if (h
->type
== STT_GNU_IFUNC
2437 && !_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
,
2443 /* It is referenced by a non-shared object. */
2445 h
->root
.non_ir_ref
= 1;
2447 if (h
->type
== STT_GNU_IFUNC
)
2448 elf_tdata (info
->output_bfd
)->has_gnu_symbols
2449 |= elf_gnu_symbol_ifunc
;
2452 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, contents
,
2453 symtab_hdr
, sym_hashes
,
2454 &r_type
, GOT_UNKNOWN
,
2455 rel
, rel_end
, h
, r_symndx
, FALSE
))
2458 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2461 case R_X86_64_TLSLD
:
2462 htab
->tls_ld_got
.refcount
+= 1;
2465 case R_X86_64_TPOFF32
:
2466 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
2467 return elf_x86_64_need_pic (abfd
, sec
, h
, symtab_hdr
, isym
,
2468 &x86_64_elf_howto_table
[r_type
]);
2470 eh
->has_got_reloc
= 1;
2473 case R_X86_64_GOTTPOFF
:
2474 if (!bfd_link_executable (info
))
2475 info
->flags
|= DF_STATIC_TLS
;
2478 case R_X86_64_GOT32
:
2479 case R_X86_64_GOTPCREL
:
2480 case R_X86_64_GOTPCRELX
:
2481 case R_X86_64_REX_GOTPCRELX
:
2482 case R_X86_64_TLSGD
:
2483 case R_X86_64_GOT64
:
2484 case R_X86_64_GOTPCREL64
:
2485 case R_X86_64_GOTPLT64
:
2486 case R_X86_64_GOTPC32_TLSDESC
:
2487 case R_X86_64_TLSDESC_CALL
:
2488 /* This symbol requires a global offset table entry. */
2490 int tls_type
, old_tls_type
;
2494 default: tls_type
= GOT_NORMAL
; break;
2495 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
2496 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
2497 case R_X86_64_GOTPC32_TLSDESC
:
2498 case R_X86_64_TLSDESC_CALL
:
2499 tls_type
= GOT_TLS_GDESC
; break;
2504 h
->got
.refcount
+= 1;
2505 old_tls_type
= eh
->tls_type
;
2509 bfd_signed_vma
*local_got_refcounts
;
2511 /* This is a global offset table entry for a local symbol. */
2512 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2513 if (local_got_refcounts
== NULL
)
2517 size
= symtab_hdr
->sh_info
;
2518 size
*= sizeof (bfd_signed_vma
)
2519 + sizeof (bfd_vma
) + sizeof (char);
2520 local_got_refcounts
= ((bfd_signed_vma
*)
2521 bfd_zalloc (abfd
, size
));
2522 if (local_got_refcounts
== NULL
)
2524 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
2525 elf_x86_64_local_tlsdesc_gotent (abfd
)
2526 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
2527 elf_x86_64_local_got_tls_type (abfd
)
2528 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
2530 local_got_refcounts
[r_symndx
] += 1;
2532 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
2535 /* If a TLS symbol is accessed using IE at least once,
2536 there is no point to use dynamic model for it. */
2537 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
2538 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
2539 || tls_type
!= GOT_TLS_IE
))
2541 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
2542 tls_type
= old_tls_type
;
2543 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
2544 && GOT_TLS_GD_ANY_P (tls_type
))
2545 tls_type
|= old_tls_type
;
2549 name
= h
->root
.root
.string
;
2551 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
2554 /* xgettext:c-format */
2555 (_("%B: '%s' accessed both as normal and"
2556 " thread local symbol"),
2558 bfd_set_error (bfd_error_bad_value
);
2563 if (old_tls_type
!= tls_type
)
2566 eh
->tls_type
= tls_type
;
2568 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
2573 case R_X86_64_GOTOFF64
:
2574 case R_X86_64_GOTPC32
:
2575 case R_X86_64_GOTPC64
:
2578 eh
->has_got_reloc
= 1;
2579 if (htab
->elf
.sgot
== NULL
)
2581 if (htab
->elf
.dynobj
== NULL
)
2582 htab
->elf
.dynobj
= abfd
;
2583 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
2589 case R_X86_64_PLT32
:
2590 case R_X86_64_PLT32_BND
:
2591 /* This symbol requires a procedure linkage table entry. We
2592 actually build the entry in adjust_dynamic_symbol,
2593 because this might be a case of linking PIC code which is
2594 never referenced by a dynamic object, in which case we
2595 don't need to generate a procedure linkage table entry
2598 /* If this is a local symbol, we resolve it directly without
2599 creating a procedure linkage table entry. */
2603 eh
->has_got_reloc
= 1;
2605 h
->plt
.refcount
+= 1;
2608 case R_X86_64_PLTOFF64
:
2609 /* This tries to form the 'address' of a function relative
2610 to GOT. For global symbols we need a PLT entry. */
2614 h
->plt
.refcount
+= 1;
2618 case R_X86_64_SIZE32
:
2619 case R_X86_64_SIZE64
:
2624 if (!ABI_64_P (abfd
))
2630 /* Check relocation overflow as these relocs may lead to
2631 run-time relocation overflow. Don't error out for
2632 sections we don't care about, such as debug sections or
2633 when relocation overflow check is disabled. */
2634 if (!info
->no_reloc_overflow_check
2635 && (bfd_link_pic (info
)
2636 || (bfd_link_executable (info
)
2640 && (sec
->flags
& SEC_READONLY
) == 0)))
2641 return elf_x86_64_need_pic (abfd
, sec
, h
, symtab_hdr
, isym
,
2642 &x86_64_elf_howto_table
[r_type
]);
2648 case R_X86_64_PC32_BND
:
2652 if (eh
!= NULL
&& (sec
->flags
& SEC_CODE
) != 0)
2653 eh
->has_non_got_reloc
= 1;
2654 /* We are called after all symbols have been resolved. Only
2655 relocation against STT_GNU_IFUNC symbol must go through
2658 && (bfd_link_executable (info
)
2659 || h
->type
== STT_GNU_IFUNC
))
2661 /* If this reloc is in a read-only section, we might
2662 need a copy reloc. We can't check reliably at this
2663 stage whether the section is read-only, as input
2664 sections have not yet been mapped to output sections.
2665 Tentatively set the flag for now, and correct in
2666 adjust_dynamic_symbol. */
2669 /* We may need a .plt entry if the symbol is a function
2670 defined in a shared lib or is a STT_GNU_IFUNC function
2671 referenced from the code or read-only section. */
2673 || (sec
->flags
& (SEC_CODE
| SEC_READONLY
)) != 0)
2674 h
->plt
.refcount
+= 1;
2676 if (r_type
== R_X86_64_PC32
)
2678 /* Since something like ".long foo - ." may be used
2679 as pointer, make sure that PLT is used if foo is
2680 a function defined in a shared library. */
2681 if ((sec
->flags
& SEC_CODE
) == 0)
2682 h
->pointer_equality_needed
= 1;
2684 else if (r_type
!= R_X86_64_PC32_BND
2685 && r_type
!= R_X86_64_PC64
)
2687 h
->pointer_equality_needed
= 1;
2688 /* At run-time, R_X86_64_64 can be resolved for both
2689 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2690 can only be resolved for x32. */
2691 if ((sec
->flags
& SEC_READONLY
) == 0
2692 && (r_type
== R_X86_64_64
2693 || (!ABI_64_P (abfd
)
2694 && (r_type
== R_X86_64_32
2695 || r_type
== R_X86_64_32S
))))
2696 eh
->func_pointer_refcount
+= 1;
2702 /* If we are creating a shared library, and this is a reloc
2703 against a global symbol, or a non PC relative reloc
2704 against a local symbol, then we need to copy the reloc
2705 into the shared library. However, if we are linking with
2706 -Bsymbolic, we do not need to copy a reloc against a
2707 global symbol which is defined in an object we are
2708 including in the link (i.e., DEF_REGULAR is set). At
2709 this point we have not seen all the input files, so it is
2710 possible that DEF_REGULAR is not set now but will be set
2711 later (it is never cleared). In case of a weak definition,
2712 DEF_REGULAR may be cleared later by a strong definition in
2713 a shared library. We account for that possibility below by
2714 storing information in the relocs_copied field of the hash
2715 table entry. A similar situation occurs when creating
2716 shared libraries and symbol visibility changes render the
2719 If on the other hand, we are creating an executable, we
2720 may need to keep relocations for symbols satisfied by a
2721 dynamic library if we manage to avoid copy relocs for the
2724 Generate dynamic pointer relocation against STT_GNU_IFUNC
2725 symbol in the non-code section. */
2726 if ((bfd_link_pic (info
)
2727 && (! IS_X86_64_PCREL_TYPE (r_type
)
2729 && (! (bfd_link_pie (info
)
2730 || SYMBOLIC_BIND (info
, h
))
2731 || h
->root
.type
== bfd_link_hash_defweak
2732 || !h
->def_regular
))))
2734 && h
->type
== STT_GNU_IFUNC
2735 && r_type
== htab
->pointer_r_type
2736 && (sec
->flags
& SEC_CODE
) == 0)
2737 || (ELIMINATE_COPY_RELOCS
2738 && !bfd_link_pic (info
)
2740 && (h
->root
.type
== bfd_link_hash_defweak
2741 || !h
->def_regular
)))
2743 struct elf_dyn_relocs
*p
;
2744 struct elf_dyn_relocs
**head
;
2746 /* We must copy these reloc types into the output file.
2747 Create a reloc section in dynobj and make room for
2751 if (htab
->elf
.dynobj
== NULL
)
2752 htab
->elf
.dynobj
= abfd
;
2754 sreloc
= _bfd_elf_make_dynamic_reloc_section
2755 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
2756 abfd
, /*rela?*/ TRUE
);
2762 /* If this is a global symbol, we count the number of
2763 relocations we need for this symbol. */
2765 head
= &eh
->dyn_relocs
;
2768 /* Track dynamic relocs needed for local syms too.
2769 We really need local syms available to do this
2774 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2779 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2783 /* Beware of type punned pointers vs strict aliasing
2785 vpp
= &(elf_section_data (s
)->local_dynrel
);
2786 head
= (struct elf_dyn_relocs
**)vpp
;
2790 if (p
== NULL
|| p
->sec
!= sec
)
2792 bfd_size_type amt
= sizeof *p
;
2794 p
= ((struct elf_dyn_relocs
*)
2795 bfd_alloc (htab
->elf
.dynobj
, amt
));
2806 /* Count size relocation as PC-relative relocation. */
2807 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2812 /* This relocation describes the C++ object vtable hierarchy.
2813 Reconstruct it for later use during GC. */
2814 case R_X86_64_GNU_VTINHERIT
:
2815 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2819 /* This relocation describes which C++ vtable entries are actually
2820 used. Record for later use during GC. */
2821 case R_X86_64_GNU_VTENTRY
:
2822 BFD_ASSERT (h
!= NULL
);
2824 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2832 if ((r_type
== R_X86_64_GOTPCREL
2833 || r_type
== R_X86_64_GOTPCRELX
2834 || r_type
== R_X86_64_REX_GOTPCRELX
)
2835 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2836 sec
->need_convert_load
= 1;
2839 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2841 if (!info
->keep_memory
)
2845 /* Cache the section contents for elf_link_input_bfd. */
2846 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2853 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2855 sec
->check_relocs_failed
= 1;
2859 /* Return the section that should be marked against GC for a given
2863 elf_x86_64_gc_mark_hook (asection
*sec
,
2864 struct bfd_link_info
*info
,
2865 Elf_Internal_Rela
*rel
,
2866 struct elf_link_hash_entry
*h
,
2867 Elf_Internal_Sym
*sym
)
2870 switch (ELF32_R_TYPE (rel
->r_info
))
2872 case R_X86_64_GNU_VTINHERIT
:
2873 case R_X86_64_GNU_VTENTRY
:
2877 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2880 /* Remove undefined weak symbol from the dynamic symbol table if it
2881 is resolved to 0. */
2884 elf_x86_64_fixup_symbol (struct bfd_link_info
*info
,
2885 struct elf_link_hash_entry
*h
)
2887 if (h
->dynindx
!= -1
2888 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
2889 elf_x86_64_hash_entry (h
)->has_got_reloc
,
2890 elf_x86_64_hash_entry (h
)))
2893 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
2899 /* Adjust a symbol defined by a dynamic object and referenced by a
2900 regular object. The current definition is in some section of the
2901 dynamic object, but we're not including those sections. We have to
2902 change the definition to something the rest of the link can
2906 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2907 struct elf_link_hash_entry
*h
)
2909 struct elf_x86_64_link_hash_table
*htab
;
2911 struct elf_x86_64_link_hash_entry
*eh
;
2912 struct elf_dyn_relocs
*p
;
2914 /* STT_GNU_IFUNC symbol must go through PLT. */
2915 if (h
->type
== STT_GNU_IFUNC
)
2917 /* All local STT_GNU_IFUNC references must be treate as local
2918 calls via local PLT. */
2920 && SYMBOL_CALLS_LOCAL (info
, h
))
2922 bfd_size_type pc_count
= 0, count
= 0;
2923 struct elf_dyn_relocs
**pp
;
2925 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2926 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2928 pc_count
+= p
->pc_count
;
2929 p
->count
-= p
->pc_count
;
2938 if (pc_count
|| count
)
2943 /* Increment PLT reference count only for PC-relative
2946 if (h
->plt
.refcount
<= 0)
2947 h
->plt
.refcount
= 1;
2949 h
->plt
.refcount
+= 1;
2954 if (h
->plt
.refcount
<= 0)
2956 h
->plt
.offset
= (bfd_vma
) -1;
2962 /* If this is a function, put it in the procedure linkage table. We
2963 will fill in the contents of the procedure linkage table later,
2964 when we know the address of the .got section. */
2965 if (h
->type
== STT_FUNC
2968 if (h
->plt
.refcount
<= 0
2969 || SYMBOL_CALLS_LOCAL (info
, h
)
2970 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2971 && h
->root
.type
== bfd_link_hash_undefweak
))
2973 /* This case can occur if we saw a PLT32 reloc in an input
2974 file, but the symbol was never referred to by a dynamic
2975 object, or if all references were garbage collected. In
2976 such a case, we don't actually need to build a procedure
2977 linkage table, and we can just do a PC32 reloc instead. */
2978 h
->plt
.offset
= (bfd_vma
) -1;
2985 /* It's possible that we incorrectly decided a .plt reloc was
2986 needed for an R_X86_64_PC32 reloc to a non-function sym in
2987 check_relocs. We can't decide accurately between function and
2988 non-function syms in check-relocs; Objects loaded later in
2989 the link may change h->type. So fix it now. */
2990 h
->plt
.offset
= (bfd_vma
) -1;
2992 /* If this is a weak symbol, and there is a real definition, the
2993 processor independent code will have arranged for us to see the
2994 real definition first, and we can just use the same value. */
2995 if (h
->u
.weakdef
!= NULL
)
2997 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2998 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2999 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
3000 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
3001 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
3003 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3004 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
3005 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
3010 /* This is a reference to a symbol defined by a dynamic object which
3011 is not a function. */
3013 /* If we are creating a shared library, we must presume that the
3014 only references to the symbol are via the global offset table.
3015 For such cases we need not do anything here; the relocations will
3016 be handled correctly by relocate_section. */
3017 if (!bfd_link_executable (info
))
3020 /* If there are no references to this symbol that do not use the
3021 GOT, we don't need to generate a copy reloc. */
3022 if (!h
->non_got_ref
)
3025 /* If -z nocopyreloc was given, we won't generate them either. */
3026 if (info
->nocopyreloc
)
3032 if (ELIMINATE_COPY_RELOCS
)
3034 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3035 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
3037 s
= p
->sec
->output_section
;
3038 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
3042 /* If we didn't find any dynamic relocs in read-only sections, then
3043 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
3051 /* We must allocate the symbol in our .dynbss section, which will
3052 become part of the .bss section of the executable. There will be
3053 an entry for this symbol in the .dynsym section. The dynamic
3054 object will contain position independent code, so all references
3055 from the dynamic object to this symbol will go through the global
3056 offset table. The dynamic linker will use the .dynsym entry to
3057 determine the address it must put in the global offset table, so
3058 both the dynamic object and the regular object will refer to the
3059 same memory location for the variable. */
3061 htab
= elf_x86_64_hash_table (info
);
3065 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
3066 to copy the initial value out of the dynamic object and into the
3067 runtime process image. */
3068 if ((h
->root
.u
.def
.section
->flags
& SEC_READONLY
) != 0)
3070 s
= htab
->elf
.sdynrelro
;
3071 srel
= htab
->elf
.sreldynrelro
;
3075 s
= htab
->elf
.sdynbss
;
3076 srel
= htab
->elf
.srelbss
;
3078 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
3080 const struct elf_backend_data
*bed
;
3081 bed
= get_elf_backend_data (info
->output_bfd
);
3082 srel
->size
+= bed
->s
->sizeof_rela
;
3086 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
3089 /* Allocate space in .plt, .got and associated reloc sections for
3093 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
3095 struct bfd_link_info
*info
;
3096 struct elf_x86_64_link_hash_table
*htab
;
3097 struct elf_x86_64_link_hash_entry
*eh
;
3098 struct elf_dyn_relocs
*p
;
3099 const struct elf_backend_data
*bed
;
3100 unsigned int plt_entry_size
;
3101 bfd_boolean resolved_to_zero
;
3103 if (h
->root
.type
== bfd_link_hash_indirect
)
3106 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3108 info
= (struct bfd_link_info
*) inf
;
3109 htab
= elf_x86_64_hash_table (info
);
3112 bed
= get_elf_backend_data (info
->output_bfd
);
3113 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3115 resolved_to_zero
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
3119 /* We can't use the GOT PLT if pointer equality is needed since
3120 finish_dynamic_symbol won't clear symbol value and the dynamic
3121 linker won't update the GOT slot. We will get into an infinite
3122 loop at run-time. */
3123 if (htab
->plt_got
!= NULL
3124 && h
->type
!= STT_GNU_IFUNC
3125 && !h
->pointer_equality_needed
3126 && h
->plt
.refcount
> 0
3127 && h
->got
.refcount
> 0)
3129 /* Don't use the regular PLT if there are both GOT and GOTPLT
3131 h
->plt
.offset
= (bfd_vma
) -1;
3133 /* Use the GOT PLT. */
3134 eh
->plt_got
.refcount
= 1;
3137 /* Clear the reference count of function pointer relocations if
3138 symbol isn't a normal function. */
3139 if (h
->type
!= STT_FUNC
)
3140 eh
->func_pointer_refcount
= 0;
3142 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
3143 here if it is defined and referenced in a non-shared object. */
3144 if (h
->type
== STT_GNU_IFUNC
3147 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
3149 &htab
->readonly_dynrelocs_against_ifunc
,
3152 GOT_ENTRY_SIZE
, TRUE
))
3154 asection
*s
= htab
->plt_bnd
;
3155 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
3157 /* Use the .plt.bnd section if it is created. */
3158 eh
->plt_bnd
.offset
= s
->size
;
3160 /* Make room for this entry in the .plt.bnd section. */
3161 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
3169 /* Don't create the PLT entry if there are only function pointer
3170 relocations which can be resolved at run-time. */
3171 else if (htab
->elf
.dynamic_sections_created
3172 && (h
->plt
.refcount
> eh
->func_pointer_refcount
3173 || eh
->plt_got
.refcount
> 0))
3175 bfd_boolean use_plt_got
;
3177 /* Clear the reference count of function pointer relocations
3179 eh
->func_pointer_refcount
= 0;
3181 if (htab
->plt_got
!= NULL
3182 && (info
->flags
& DF_BIND_NOW
)
3183 && !h
->pointer_equality_needed
)
3185 /* Don't use the regular PLT for DF_BIND_NOW. */
3186 h
->plt
.offset
= (bfd_vma
) -1;
3188 /* Use the GOT PLT. */
3189 h
->got
.refcount
= 1;
3190 eh
->plt_got
.refcount
= 1;
3193 use_plt_got
= eh
->plt_got
.refcount
> 0;
3195 /* Make sure this symbol is output as a dynamic symbol.
3196 Undefined weak syms won't yet be marked as dynamic. */
3197 if (h
->dynindx
== -1
3199 && !resolved_to_zero
3200 && h
->root
.type
== bfd_link_hash_undefweak
)
3202 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3206 if (bfd_link_pic (info
)
3207 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
3209 asection
*s
= htab
->elf
.splt
;
3210 asection
*bnd_s
= htab
->plt_bnd
;
3211 asection
*got_s
= htab
->plt_got
;
3213 /* If this is the first .plt entry, make room for the special
3214 first entry. The .plt section is used by prelink to undo
3215 prelinking for dynamic relocations. */
3217 s
->size
= plt_entry_size
;
3220 eh
->plt_got
.offset
= got_s
->size
;
3223 h
->plt
.offset
= s
->size
;
3225 eh
->plt_bnd
.offset
= bnd_s
->size
;
3228 /* If this symbol is not defined in a regular file, and we are
3229 not generating a shared library, then set the symbol to this
3230 location in the .plt. This is required to make function
3231 pointers compare as equal between the normal executable and
3232 the shared library. */
3233 if (! bfd_link_pic (info
)
3238 /* We need to make a call to the entry of the GOT PLT
3239 instead of regular PLT entry. */
3240 h
->root
.u
.def
.section
= got_s
;
3241 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
3247 /* We need to make a call to the entry of the second
3248 PLT instead of regular PLT entry. */
3249 h
->root
.u
.def
.section
= bnd_s
;
3250 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
3254 h
->root
.u
.def
.section
= s
;
3255 h
->root
.u
.def
.value
= h
->plt
.offset
;
3260 /* Make room for this entry. */
3262 got_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
3265 s
->size
+= plt_entry_size
;
3267 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
3269 /* We also need to make an entry in the .got.plt section,
3270 which will be placed in the .got section by the linker
3272 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
3274 /* There should be no PLT relocation against resolved
3275 undefined weak symbol in executable. */
3276 if (!resolved_to_zero
)
3278 /* We also need to make an entry in the .rela.plt
3280 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
3281 htab
->elf
.srelplt
->reloc_count
++;
3287 eh
->plt_got
.offset
= (bfd_vma
) -1;
3288 h
->plt
.offset
= (bfd_vma
) -1;
3294 eh
->plt_got
.offset
= (bfd_vma
) -1;
3295 h
->plt
.offset
= (bfd_vma
) -1;
3299 eh
->tlsdesc_got
= (bfd_vma
) -1;
3301 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
3302 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
3303 if (h
->got
.refcount
> 0
3304 && bfd_link_executable (info
)
3306 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
3308 h
->got
.offset
= (bfd_vma
) -1;
3310 else if (h
->got
.refcount
> 0)
3314 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3316 /* Make sure this symbol is output as a dynamic symbol.
3317 Undefined weak syms won't yet be marked as dynamic. */
3318 if (h
->dynindx
== -1
3320 && !resolved_to_zero
3321 && h
->root
.type
== bfd_link_hash_undefweak
)
3323 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3327 if (GOT_TLS_GDESC_P (tls_type
))
3329 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
3330 - elf_x86_64_compute_jump_table_size (htab
);
3331 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3332 h
->got
.offset
= (bfd_vma
) -2;
3334 if (! GOT_TLS_GDESC_P (tls_type
)
3335 || GOT_TLS_GD_P (tls_type
))
3338 h
->got
.offset
= s
->size
;
3339 s
->size
+= GOT_ENTRY_SIZE
;
3340 if (GOT_TLS_GD_P (tls_type
))
3341 s
->size
+= GOT_ENTRY_SIZE
;
3343 dyn
= htab
->elf
.dynamic_sections_created
;
3344 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
3345 and two if global. R_X86_64_GOTTPOFF needs one dynamic
3346 relocation. No dynamic relocation against resolved undefined
3347 weak symbol in executable. */
3348 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
3349 || tls_type
== GOT_TLS_IE
)
3350 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3351 else if (GOT_TLS_GD_P (tls_type
))
3352 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
3353 else if (! GOT_TLS_GDESC_P (tls_type
)
3354 && ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3355 && !resolved_to_zero
)
3356 || h
->root
.type
!= bfd_link_hash_undefweak
)
3357 && (bfd_link_pic (info
)
3358 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
3359 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3360 if (GOT_TLS_GDESC_P (tls_type
))
3362 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
3363 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3367 h
->got
.offset
= (bfd_vma
) -1;
3369 if (eh
->dyn_relocs
== NULL
)
3372 /* In the shared -Bsymbolic case, discard space allocated for
3373 dynamic pc-relative relocs against symbols which turn out to be
3374 defined in regular objects. For the normal shared case, discard
3375 space for pc-relative relocs that have become local due to symbol
3376 visibility changes. */
3378 if (bfd_link_pic (info
))
3380 /* Relocs that use pc_count are those that appear on a call
3381 insn, or certain REL relocs that can generated via assembly.
3382 We want calls to protected symbols to resolve directly to the
3383 function rather than going via the plt. If people want
3384 function pointer comparisons to work as expected then they
3385 should avoid writing weird assembly. */
3386 if (SYMBOL_CALLS_LOCAL (info
, h
))
3388 struct elf_dyn_relocs
**pp
;
3390 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
3392 p
->count
-= p
->pc_count
;
3401 /* Also discard relocs on undefined weak syms with non-default
3402 visibility or in PIE. */
3403 if (eh
->dyn_relocs
!= NULL
)
3405 if (h
->root
.type
== bfd_link_hash_undefweak
)
3407 /* Undefined weak symbol is never bound locally in shared
3409 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3410 || resolved_to_zero
)
3411 eh
->dyn_relocs
= NULL
;
3412 else if (h
->dynindx
== -1
3413 && ! h
->forced_local
3414 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
3417 /* For PIE, discard space for pc-relative relocs against
3418 symbols which turn out to need copy relocs. */
3419 else if (bfd_link_executable (info
)
3420 && (h
->needs_copy
|| eh
->needs_copy
)
3424 struct elf_dyn_relocs
**pp
;
3426 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
3428 if (p
->pc_count
!= 0)
3436 else if (ELIMINATE_COPY_RELOCS
)
3438 /* For the non-shared case, discard space for relocs against
3439 symbols which turn out to need copy relocs or are not
3440 dynamic. Keep dynamic relocations for run-time function
3441 pointer initialization. */
3443 if ((!h
->non_got_ref
3444 || eh
->func_pointer_refcount
> 0
3445 || (h
->root
.type
== bfd_link_hash_undefweak
3446 && !resolved_to_zero
))
3449 || (htab
->elf
.dynamic_sections_created
3450 && (h
->root
.type
== bfd_link_hash_undefweak
3451 || h
->root
.type
== bfd_link_hash_undefined
))))
3453 /* Make sure this symbol is output as a dynamic symbol.
3454 Undefined weak syms won't yet be marked as dynamic. */
3455 if (h
->dynindx
== -1
3456 && ! h
->forced_local
3457 && ! resolved_to_zero
3458 && h
->root
.type
== bfd_link_hash_undefweak
3459 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
3462 /* If that succeeded, we know we'll be keeping all the
3464 if (h
->dynindx
!= -1)
3468 eh
->dyn_relocs
= NULL
;
3469 eh
->func_pointer_refcount
= 0;
3474 /* Finally, allocate space. */
3475 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
3479 sreloc
= elf_section_data (p
->sec
)->sreloc
;
3481 BFD_ASSERT (sreloc
!= NULL
);
3483 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3489 /* Allocate space in .plt, .got and associated reloc sections for
3490 local dynamic relocs. */
3493 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
3495 struct elf_link_hash_entry
*h
3496 = (struct elf_link_hash_entry
*) *slot
;
3498 if (h
->type
!= STT_GNU_IFUNC
3502 || h
->root
.type
!= bfd_link_hash_defined
)
3505 return elf_x86_64_allocate_dynrelocs (h
, inf
);
3508 /* Find any dynamic relocs that apply to read-only sections. */
3511 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
3514 struct elf_x86_64_link_hash_entry
*eh
;
3515 struct elf_dyn_relocs
*p
;
3517 /* Skip local IFUNC symbols. */
3518 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
3521 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3522 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
3524 asection
*s
= p
->sec
->output_section
;
3526 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
3528 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
3530 info
->flags
|= DF_TEXTREL
;
3532 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3533 || info
->error_textrel
)
3534 /* xgettext:c-format */
3535 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3536 p
->sec
->owner
, h
->root
.root
.string
,
3539 /* Not an error, just cut short the traversal. */
3546 /* Convert load via the GOT slot to load immediate. */
3549 elf_x86_64_convert_load (bfd
*abfd
, asection
*sec
,
3550 struct bfd_link_info
*link_info
)
3552 Elf_Internal_Shdr
*symtab_hdr
;
3553 Elf_Internal_Rela
*internal_relocs
;
3554 Elf_Internal_Rela
*irel
, *irelend
;
3556 struct elf_x86_64_link_hash_table
*htab
;
3557 bfd_boolean changed
;
3558 bfd_signed_vma
*local_got_refcounts
;
3560 /* Don't even try to convert non-ELF outputs. */
3561 if (!is_elf_hash_table (link_info
->hash
))
3564 /* Nothing to do if there is no need or no output. */
3565 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
3566 || sec
->need_convert_load
== 0
3567 || bfd_is_abs_section (sec
->output_section
))
3570 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3572 /* Load the relocations for this section. */
3573 internal_relocs
= (_bfd_elf_link_read_relocs
3574 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
3575 link_info
->keep_memory
));
3576 if (internal_relocs
== NULL
)
3580 htab
= elf_x86_64_hash_table (link_info
);
3581 local_got_refcounts
= elf_local_got_refcounts (abfd
);
3583 /* Get the section contents. */
3584 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
3585 contents
= elf_section_data (sec
)->this_hdr
.contents
;
3588 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
3592 irelend
= internal_relocs
+ sec
->reloc_count
;
3593 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
3595 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
3596 unsigned int r_symndx
;
3597 struct elf_link_hash_entry
*h
;
3598 bfd_boolean converted
;
3600 if (r_type
!= R_X86_64_GOTPCRELX
3601 && r_type
!= R_X86_64_REX_GOTPCRELX
3602 && r_type
!= R_X86_64_GOTPCREL
)
3605 r_symndx
= htab
->r_sym (irel
->r_info
);
3606 if (r_symndx
< symtab_hdr
->sh_info
)
3607 h
= elf_x86_64_get_local_sym_hash (htab
, sec
->owner
,
3608 (const Elf_Internal_Rela
*) irel
,
3612 h
= elf_sym_hashes (abfd
)[r_symndx
- symtab_hdr
->sh_info
];
3613 while (h
->root
.type
== bfd_link_hash_indirect
3614 || h
->root
.type
== bfd_link_hash_warning
)
3615 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3618 /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
3619 if (h
!= NULL
&& h
->type
== STT_GNU_IFUNC
)
3623 if (!elf_x86_64_convert_load_reloc (abfd
, sec
, contents
, irel
, h
,
3624 &converted
, link_info
))
3629 changed
= converted
;
3632 if (h
->got
.refcount
> 0)
3633 h
->got
.refcount
-= 1;
3637 if (local_got_refcounts
!= NULL
3638 && local_got_refcounts
[r_symndx
] > 0)
3639 local_got_refcounts
[r_symndx
] -= 1;
3644 if (contents
!= NULL
3645 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3647 if (!changed
&& !link_info
->keep_memory
)
3651 /* Cache the section contents for elf_link_input_bfd. */
3652 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3656 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3659 free (internal_relocs
);
3661 elf_section_data (sec
)->relocs
= internal_relocs
;
3667 if (contents
!= NULL
3668 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3670 if (internal_relocs
!= NULL
3671 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3672 free (internal_relocs
);
3676 /* Set the sizes of the dynamic sections. */
3679 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3680 struct bfd_link_info
*info
)
3682 struct elf_x86_64_link_hash_table
*htab
;
3687 const struct elf_backend_data
*bed
;
3688 const struct elf_x86_64_backend_data
*arch_data
;
3690 htab
= elf_x86_64_hash_table (info
);
3693 bed
= get_elf_backend_data (output_bfd
);
3695 dynobj
= htab
->elf
.dynobj
;
3699 /* Set up .got offsets for local syms, and space for local dynamic
3701 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3703 bfd_signed_vma
*local_got
;
3704 bfd_signed_vma
*end_local_got
;
3705 char *local_tls_type
;
3706 bfd_vma
*local_tlsdesc_gotent
;
3707 bfd_size_type locsymcount
;
3708 Elf_Internal_Shdr
*symtab_hdr
;
3711 if (! is_x86_64_elf (ibfd
))
3714 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3716 struct elf_dyn_relocs
*p
;
3718 if (!elf_x86_64_convert_load (ibfd
, s
, info
))
3721 for (p
= (struct elf_dyn_relocs
*)
3722 (elf_section_data (s
)->local_dynrel
);
3726 if (!bfd_is_abs_section (p
->sec
)
3727 && bfd_is_abs_section (p
->sec
->output_section
))
3729 /* Input section has been discarded, either because
3730 it is a copy of a linkonce section or due to
3731 linker script /DISCARD/, so we'll be discarding
3734 else if (p
->count
!= 0)
3736 srel
= elf_section_data (p
->sec
)->sreloc
;
3737 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3738 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3739 && (info
->flags
& DF_TEXTREL
) == 0)
3741 info
->flags
|= DF_TEXTREL
;
3742 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3743 || info
->error_textrel
)
3744 /* xgettext:c-format */
3745 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3746 p
->sec
->owner
, p
->sec
);
3752 local_got
= elf_local_got_refcounts (ibfd
);
3756 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3757 locsymcount
= symtab_hdr
->sh_info
;
3758 end_local_got
= local_got
+ locsymcount
;
3759 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3760 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3762 srel
= htab
->elf
.srelgot
;
3763 for (; local_got
< end_local_got
;
3764 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3766 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3769 if (GOT_TLS_GDESC_P (*local_tls_type
))
3771 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3772 - elf_x86_64_compute_jump_table_size (htab
);
3773 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3774 *local_got
= (bfd_vma
) -2;
3776 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3777 || GOT_TLS_GD_P (*local_tls_type
))
3779 *local_got
= s
->size
;
3780 s
->size
+= GOT_ENTRY_SIZE
;
3781 if (GOT_TLS_GD_P (*local_tls_type
))
3782 s
->size
+= GOT_ENTRY_SIZE
;
3784 if (bfd_link_pic (info
)
3785 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3786 || *local_tls_type
== GOT_TLS_IE
)
3788 if (GOT_TLS_GDESC_P (*local_tls_type
))
3790 htab
->elf
.srelplt
->size
3791 += bed
->s
->sizeof_rela
;
3792 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3794 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3795 || GOT_TLS_GD_P (*local_tls_type
))
3796 srel
->size
+= bed
->s
->sizeof_rela
;
3800 *local_got
= (bfd_vma
) -1;
3804 if (htab
->tls_ld_got
.refcount
> 0)
3806 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3808 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3809 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3810 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3813 htab
->tls_ld_got
.offset
= -1;
3815 /* Allocate global sym .plt and .got entries, and space for global
3816 sym dynamic relocs. */
3817 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3820 /* Allocate .plt and .got entries, and space for local symbols. */
3821 htab_traverse (htab
->loc_hash_table
,
3822 elf_x86_64_allocate_local_dynrelocs
,
3825 /* For every jump slot reserved in the sgotplt, reloc_count is
3826 incremented. However, when we reserve space for TLS descriptors,
3827 it's not incremented, so in order to compute the space reserved
3828 for them, it suffices to multiply the reloc count by the jump
3831 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3832 so that R_X86_64_IRELATIVE entries come last. */
3833 if (htab
->elf
.srelplt
)
3835 htab
->sgotplt_jump_table_size
3836 = elf_x86_64_compute_jump_table_size (htab
);
3837 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3839 else if (htab
->elf
.irelplt
)
3840 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3842 if (htab
->tlsdesc_plt
)
3844 /* If we're not using lazy TLS relocations, don't generate the
3845 PLT and GOT entries they require. */
3846 if ((info
->flags
& DF_BIND_NOW
))
3847 htab
->tlsdesc_plt
= 0;
3850 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3851 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3852 /* Reserve room for the initial entry.
3853 FIXME: we could probably do away with it in this case. */
3854 if (htab
->elf
.splt
->size
== 0)
3855 htab
->elf
.splt
->size
= GET_PLT_ENTRY_SIZE (output_bfd
);
3856 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3857 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3861 if (htab
->elf
.sgotplt
)
3863 /* Don't allocate .got.plt section if there are no GOT nor PLT
3864 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3865 if ((htab
->elf
.hgot
== NULL
3866 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3867 && (htab
->elf
.sgotplt
->size
3868 == get_elf_backend_data (output_bfd
)->got_header_size
)
3869 && (htab
->elf
.splt
== NULL
3870 || htab
->elf
.splt
->size
== 0)
3871 && (htab
->elf
.sgot
== NULL
3872 || htab
->elf
.sgot
->size
== 0)
3873 && (htab
->elf
.iplt
== NULL
3874 || htab
->elf
.iplt
->size
== 0)
3875 && (htab
->elf
.igotplt
== NULL
3876 || htab
->elf
.igotplt
->size
== 0))
3877 htab
->elf
.sgotplt
->size
= 0;
3880 arch_data
= (htab
->plt_bnd
!= NULL
3881 ? &elf_x86_64_bnd_arch_bed
3882 : get_elf_x86_64_arch_data (bed
));
3884 if (_bfd_elf_eh_frame_present (info
))
3886 if (htab
->plt_eh_frame
!= NULL
3887 && htab
->elf
.splt
!= NULL
3888 && htab
->elf
.splt
->size
!= 0
3889 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
))
3890 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3892 if (htab
->plt_got_eh_frame
!= NULL
3893 && htab
->plt_got
!= NULL
3894 && htab
->plt_got
->size
!= 0
3895 && !bfd_is_abs_section (htab
->plt_got
->output_section
))
3896 htab
->plt_got_eh_frame
->size
= arch_data
->eh_frame_plt_got_size
;
3898 /* Unwind info for .plt.bnd and .plt.got sections are
3900 if (htab
->plt_bnd_eh_frame
!= NULL
3901 && htab
->plt_bnd
!= NULL
3902 && htab
->plt_bnd
->size
!= 0
3903 && !bfd_is_abs_section (htab
->plt_bnd
->output_section
))
3904 htab
->plt_bnd_eh_frame
->size
= arch_data
->eh_frame_plt_got_size
;
3907 /* We now have determined the sizes of the various dynamic sections.
3908 Allocate memory for them. */
3910 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3912 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3915 if (s
== htab
->elf
.splt
3916 || s
== htab
->elf
.sgot
3917 || s
== htab
->elf
.sgotplt
3918 || s
== htab
->elf
.iplt
3919 || s
== htab
->elf
.igotplt
3920 || s
== htab
->plt_bnd
3921 || s
== htab
->plt_got
3922 || s
== htab
->plt_eh_frame
3923 || s
== htab
->plt_got_eh_frame
3924 || s
== htab
->plt_bnd_eh_frame
3925 || s
== htab
->elf
.sdynbss
3926 || s
== htab
->elf
.sdynrelro
)
3928 /* Strip this section if we don't need it; see the
3931 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3933 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3936 /* We use the reloc_count field as a counter if we need
3937 to copy relocs into the output file. */
3938 if (s
!= htab
->elf
.srelplt
)
3943 /* It's not one of our sections, so don't allocate space. */
3949 /* If we don't need this section, strip it from the
3950 output file. This is mostly to handle .rela.bss and
3951 .rela.plt. We must create both sections in
3952 create_dynamic_sections, because they must be created
3953 before the linker maps input sections to output
3954 sections. The linker does that before
3955 adjust_dynamic_symbol is called, and it is that
3956 function which decides whether anything needs to go
3957 into these sections. */
3959 s
->flags
|= SEC_EXCLUDE
;
3963 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3966 /* Allocate memory for the section contents. We use bfd_zalloc
3967 here in case unused entries are not reclaimed before the
3968 section's contents are written out. This should not happen,
3969 but this way if it does, we get a R_X86_64_NONE reloc instead
3971 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3972 if (s
->contents
== NULL
)
3976 if (htab
->plt_eh_frame
!= NULL
3977 && htab
->plt_eh_frame
->contents
!= NULL
)
3979 memcpy (htab
->plt_eh_frame
->contents
,
3980 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3981 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3982 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3985 if (htab
->plt_got_eh_frame
!= NULL
3986 && htab
->plt_got_eh_frame
->contents
!= NULL
)
3988 memcpy (htab
->plt_got_eh_frame
->contents
,
3989 arch_data
->eh_frame_plt_got
,
3990 htab
->plt_got_eh_frame
->size
);
3991 bfd_put_32 (dynobj
, htab
->plt_got
->size
,
3992 (htab
->plt_got_eh_frame
->contents
3993 + PLT_FDE_LEN_OFFSET
));
3996 if (htab
->plt_bnd_eh_frame
!= NULL
3997 && htab
->plt_bnd_eh_frame
->contents
!= NULL
)
3999 memcpy (htab
->plt_bnd_eh_frame
->contents
,
4000 arch_data
->eh_frame_plt_got
,
4001 htab
->plt_bnd_eh_frame
->size
);
4002 bfd_put_32 (dynobj
, htab
->plt_bnd
->size
,
4003 (htab
->plt_bnd_eh_frame
->contents
4004 + PLT_FDE_LEN_OFFSET
));
4007 if (htab
->elf
.dynamic_sections_created
)
4009 /* Add some entries to the .dynamic section. We fill in the
4010 values later, in elf_x86_64_finish_dynamic_sections, but we
4011 must add the entries now so that we get the correct size for
4012 the .dynamic section. The DT_DEBUG entry is filled in by the
4013 dynamic linker and used by the debugger. */
4014 #define add_dynamic_entry(TAG, VAL) \
4015 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4017 if (bfd_link_executable (info
))
4019 if (!add_dynamic_entry (DT_DEBUG
, 0))
4023 if (htab
->elf
.splt
->size
!= 0)
4025 /* DT_PLTGOT is used by prelink even if there is no PLT
4027 if (!add_dynamic_entry (DT_PLTGOT
, 0))
4031 if (htab
->elf
.srelplt
->size
!= 0)
4033 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
4034 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
4035 || !add_dynamic_entry (DT_JMPREL
, 0))
4039 if (htab
->tlsdesc_plt
4040 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
4041 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
4046 if (!add_dynamic_entry (DT_RELA
, 0)
4047 || !add_dynamic_entry (DT_RELASZ
, 0)
4048 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
4051 /* If any dynamic relocs apply to a read-only section,
4052 then we need a DT_TEXTREL entry. */
4053 if ((info
->flags
& DF_TEXTREL
) == 0)
4054 elf_link_hash_traverse (&htab
->elf
,
4055 elf_x86_64_readonly_dynrelocs
,
4058 if ((info
->flags
& DF_TEXTREL
) != 0)
4060 if (htab
->readonly_dynrelocs_against_ifunc
)
4062 info
->callbacks
->einfo
4063 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
4064 bfd_set_error (bfd_error_bad_value
);
4068 if (!add_dynamic_entry (DT_TEXTREL
, 0))
4073 #undef add_dynamic_entry
4079 elf_x86_64_always_size_sections (bfd
*output_bfd
,
4080 struct bfd_link_info
*info
)
4082 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
4086 struct elf_link_hash_entry
*tlsbase
;
4088 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
4089 "_TLS_MODULE_BASE_",
4090 FALSE
, FALSE
, FALSE
);
4092 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
4094 struct elf_x86_64_link_hash_table
*htab
;
4095 struct bfd_link_hash_entry
*bh
= NULL
;
4096 const struct elf_backend_data
*bed
4097 = get_elf_backend_data (output_bfd
);
4099 htab
= elf_x86_64_hash_table (info
);
4103 if (!(_bfd_generic_link_add_one_symbol
4104 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
4105 tls_sec
, 0, NULL
, FALSE
,
4106 bed
->collect
, &bh
)))
4109 htab
->tls_module_base
= bh
;
4111 tlsbase
= (struct elf_link_hash_entry
*)bh
;
4112 tlsbase
->def_regular
= 1;
4113 tlsbase
->other
= STV_HIDDEN
;
4114 tlsbase
->root
.linker_def
= 1;
4115 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
4122 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
4123 executables. Rather than setting it to the beginning of the TLS
4124 section, we have to set it to the end. This function may be called
4125 multiple times, it is idempotent. */
4128 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
4130 struct elf_x86_64_link_hash_table
*htab
;
4131 struct bfd_link_hash_entry
*base
;
4133 if (!bfd_link_executable (info
))
4136 htab
= elf_x86_64_hash_table (info
);
4140 base
= htab
->tls_module_base
;
4144 base
->u
.def
.value
= htab
->elf
.tls_size
;
4147 /* Return the base VMA address which should be subtracted from real addresses
4148 when resolving @dtpoff relocation.
4149 This is PT_TLS segment p_vaddr. */
4152 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
4154 /* If tls_sec is NULL, we should have signalled an error already. */
4155 if (elf_hash_table (info
)->tls_sec
== NULL
)
4157 return elf_hash_table (info
)->tls_sec
->vma
;
4160 /* Return the relocation value for @tpoff relocation
4161 if STT_TLS virtual address is ADDRESS. */
4164 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
4166 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
4167 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
4168 bfd_vma static_tls_size
;
4170 /* If tls_segment is NULL, we should have signalled an error already. */
4171 if (htab
->tls_sec
== NULL
)
4174 /* Consider special static TLS alignment requirements. */
4175 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
4176 return address
- static_tls_size
- htab
->tls_sec
->vma
;
4179 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
4183 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
4185 /* Opcode Instruction
4188 0x0f 0x8x conditional jump */
4190 && (contents
[offset
- 1] == 0xe8
4191 || contents
[offset
- 1] == 0xe9))
4193 && contents
[offset
- 2] == 0x0f
4194 && (contents
[offset
- 1] & 0xf0) == 0x80));
4197 /* Relocate an x86_64 ELF section. */
4200 elf_x86_64_relocate_section (bfd
*output_bfd
,
4201 struct bfd_link_info
*info
,
4203 asection
*input_section
,
4205 Elf_Internal_Rela
*relocs
,
4206 Elf_Internal_Sym
*local_syms
,
4207 asection
**local_sections
)
4209 struct elf_x86_64_link_hash_table
*htab
;
4210 Elf_Internal_Shdr
*symtab_hdr
;
4211 struct elf_link_hash_entry
**sym_hashes
;
4212 bfd_vma
*local_got_offsets
;
4213 bfd_vma
*local_tlsdesc_gotents
;
4214 Elf_Internal_Rela
*rel
;
4215 Elf_Internal_Rela
*wrel
;
4216 Elf_Internal_Rela
*relend
;
4217 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
4219 BFD_ASSERT (is_x86_64_elf (input_bfd
));
4221 /* Skip if check_relocs failed. */
4222 if (input_section
->check_relocs_failed
)
4225 htab
= elf_x86_64_hash_table (info
);
4228 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
4229 sym_hashes
= elf_sym_hashes (input_bfd
);
4230 local_got_offsets
= elf_local_got_offsets (input_bfd
);
4231 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
4233 elf_x86_64_set_tls_module_base (info
);
4235 rel
= wrel
= relocs
;
4236 relend
= relocs
+ input_section
->reloc_count
;
4237 for (; rel
< relend
; wrel
++, rel
++)
4239 unsigned int r_type
;
4240 reloc_howto_type
*howto
;
4241 unsigned long r_symndx
;
4242 struct elf_link_hash_entry
*h
;
4243 struct elf_x86_64_link_hash_entry
*eh
;
4244 Elf_Internal_Sym
*sym
;
4246 bfd_vma off
, offplt
, plt_offset
;
4248 bfd_boolean unresolved_reloc
;
4249 bfd_reloc_status_type r
;
4251 asection
*base_got
, *resolved_plt
;
4253 bfd_boolean resolved_to_zero
;
4254 bfd_boolean relative_reloc
;
4256 r_type
= ELF32_R_TYPE (rel
->r_info
);
4257 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
4258 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
4265 if (r_type
>= (int) R_X86_64_standard
)
4268 /* xgettext:c-format */
4269 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
4270 input_bfd
, r_type
, input_section
);
4271 bfd_set_error (bfd_error_bad_value
);
4275 if (r_type
!= (int) R_X86_64_32
4276 || ABI_64_P (output_bfd
))
4277 howto
= x86_64_elf_howto_table
+ r_type
;
4279 howto
= (x86_64_elf_howto_table
4280 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
4281 r_symndx
= htab
->r_sym (rel
->r_info
);
4285 unresolved_reloc
= FALSE
;
4286 if (r_symndx
< symtab_hdr
->sh_info
)
4288 sym
= local_syms
+ r_symndx
;
4289 sec
= local_sections
[r_symndx
];
4291 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
4293 st_size
= sym
->st_size
;
4295 /* Relocate against local STT_GNU_IFUNC symbol. */
4296 if (!bfd_link_relocatable (info
)
4297 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4299 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
4304 /* Set STT_GNU_IFUNC symbol value. */
4305 h
->root
.u
.def
.value
= sym
->st_value
;
4306 h
->root
.u
.def
.section
= sec
;
4311 bfd_boolean warned ATTRIBUTE_UNUSED
;
4312 bfd_boolean ignored ATTRIBUTE_UNUSED
;
4314 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
4315 r_symndx
, symtab_hdr
, sym_hashes
,
4317 unresolved_reloc
, warned
, ignored
);
4321 if (sec
!= NULL
&& discarded_section (sec
))
4323 _bfd_clear_contents (howto
, input_bfd
, input_section
,
4324 contents
+ rel
->r_offset
);
4325 wrel
->r_offset
= rel
->r_offset
;
4329 /* For ld -r, remove relocations in debug sections against
4330 sections defined in discarded sections. Not done for
4331 eh_frame editing code expects to be present. */
4332 if (bfd_link_relocatable (info
)
4333 && (input_section
->flags
& SEC_DEBUGGING
))
4339 if (bfd_link_relocatable (info
))
4346 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
4348 if (r_type
== R_X86_64_64
)
4350 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4351 zero-extend it to 64bit if addend is zero. */
4352 r_type
= R_X86_64_32
;
4353 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4355 else if (r_type
== R_X86_64_SIZE64
)
4357 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4358 zero-extend it to 64bit if addend is zero. */
4359 r_type
= R_X86_64_SIZE32
;
4360 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4364 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
4366 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4367 it here if it is defined in a non-shared object. */
4369 && h
->type
== STT_GNU_IFUNC
4375 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4377 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4378 sections because such sections are not SEC_ALLOC and
4379 thus ld.so will not process them. */
4380 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
4390 case R_X86_64_GOTPCREL
:
4391 case R_X86_64_GOTPCRELX
:
4392 case R_X86_64_REX_GOTPCRELX
:
4393 case R_X86_64_GOTPCREL64
:
4394 base_got
= htab
->elf
.sgot
;
4395 off
= h
->got
.offset
;
4397 if (base_got
== NULL
)
4400 if (off
== (bfd_vma
) -1)
4402 /* We can't use h->got.offset here to save state, or
4403 even just remember the offset, as finish_dynamic_symbol
4404 would use that as offset into .got. */
4406 if (h
->plt
.offset
== (bfd_vma
) -1)
4409 if (htab
->elf
.splt
!= NULL
)
4411 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4412 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4413 base_got
= htab
->elf
.sgotplt
;
4417 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4418 off
= plt_index
* GOT_ENTRY_SIZE
;
4419 base_got
= htab
->elf
.igotplt
;
4422 if (h
->dynindx
== -1
4426 /* This references the local defitionion. We must
4427 initialize this entry in the global offset table.
4428 Since the offset must always be a multiple of 8,
4429 we use the least significant bit to record
4430 whether we have initialized it already.
4432 When doing a dynamic link, we create a .rela.got
4433 relocation entry to initialize the value. This
4434 is done in the finish_dynamic_symbol routine. */
4439 bfd_put_64 (output_bfd
, relocation
,
4440 base_got
->contents
+ off
);
4441 /* Note that this is harmless for the GOTPLT64
4442 case, as -1 | 1 still is -1. */
4448 relocation
= (base_got
->output_section
->vma
4449 + base_got
->output_offset
+ off
);
4454 if (h
->plt
.offset
== (bfd_vma
) -1)
4456 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4457 if (r_type
== htab
->pointer_r_type
4458 && (input_section
->flags
& SEC_CODE
) == 0)
4459 goto do_ifunc_pointer
;
4460 goto bad_ifunc_reloc
;
4463 /* STT_GNU_IFUNC symbol must go through PLT. */
4464 if (htab
->elf
.splt
!= NULL
)
4466 if (htab
->plt_bnd
!= NULL
)
4468 resolved_plt
= htab
->plt_bnd
;
4469 plt_offset
= eh
->plt_bnd
.offset
;
4473 resolved_plt
= htab
->elf
.splt
;
4474 plt_offset
= h
->plt
.offset
;
4479 resolved_plt
= htab
->elf
.iplt
;
4480 plt_offset
= h
->plt
.offset
;
4483 relocation
= (resolved_plt
->output_section
->vma
4484 + resolved_plt
->output_offset
+ plt_offset
);
4490 if (h
->root
.root
.string
)
4491 name
= h
->root
.root
.string
;
4493 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4496 /* xgettext:c-format */
4497 (_("%B: relocation %s against STT_GNU_IFUNC "
4498 "symbol `%s' isn't supported"), input_bfd
,
4500 bfd_set_error (bfd_error_bad_value
);
4504 if (bfd_link_pic (info
))
4509 if (ABI_64_P (output_bfd
))
4514 if (rel
->r_addend
!= 0)
4516 if (h
->root
.root
.string
)
4517 name
= h
->root
.root
.string
;
4519 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4522 /* xgettext:c-format */
4523 (_("%B: relocation %s against STT_GNU_IFUNC "
4524 "symbol `%s' has non-zero addend: %d"),
4525 input_bfd
, howto
->name
, name
, rel
->r_addend
);
4526 bfd_set_error (bfd_error_bad_value
);
4530 /* Generate dynamic relcoation only when there is a
4531 non-GOT reference in a shared object or there is no
4533 if ((bfd_link_pic (info
) && h
->non_got_ref
)
4534 || h
->plt
.offset
== (bfd_vma
) -1)
4536 Elf_Internal_Rela outrel
;
4539 /* Need a dynamic relocation to get the real function
4541 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
4545 if (outrel
.r_offset
== (bfd_vma
) -1
4546 || outrel
.r_offset
== (bfd_vma
) -2)
4549 outrel
.r_offset
+= (input_section
->output_section
->vma
4550 + input_section
->output_offset
);
4552 if (h
->dynindx
== -1
4554 || bfd_link_executable (info
))
4556 /* This symbol is resolved locally. */
4557 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4558 outrel
.r_addend
= (h
->root
.u
.def
.value
4559 + h
->root
.u
.def
.section
->output_section
->vma
4560 + h
->root
.u
.def
.section
->output_offset
);
4564 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4565 outrel
.r_addend
= 0;
4568 /* Dynamic relocations are stored in
4569 1. .rela.ifunc section in PIC object.
4570 2. .rela.got section in dynamic executable.
4571 3. .rela.iplt section in static executable. */
4572 if (bfd_link_pic (info
))
4573 sreloc
= htab
->elf
.irelifunc
;
4574 else if (htab
->elf
.splt
!= NULL
)
4575 sreloc
= htab
->elf
.srelgot
;
4577 sreloc
= htab
->elf
.irelplt
;
4578 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4580 /* If this reloc is against an external symbol, we
4581 do not want to fiddle with the addend. Otherwise,
4582 we need to include the symbol value so that it
4583 becomes an addend for the dynamic reloc. For an
4584 internal symbol, we have updated addend. */
4589 case R_X86_64_PC32_BND
:
4591 case R_X86_64_PLT32
:
4592 case R_X86_64_PLT32_BND
:
4597 resolved_to_zero
= (eh
!= NULL
4598 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
4602 /* When generating a shared object, the relocations handled here are
4603 copied into the output file to be resolved at run time. */
4606 case R_X86_64_GOT32
:
4607 case R_X86_64_GOT64
:
4608 /* Relocation is to the entry for this symbol in the global
4610 case R_X86_64_GOTPCREL
:
4611 case R_X86_64_GOTPCRELX
:
4612 case R_X86_64_REX_GOTPCRELX
:
4613 case R_X86_64_GOTPCREL64
:
4614 /* Use global offset table entry as symbol value. */
4615 case R_X86_64_GOTPLT64
:
4616 /* This is obsolete and treated the the same as GOT64. */
4617 base_got
= htab
->elf
.sgot
;
4619 if (htab
->elf
.sgot
== NULL
)
4622 relative_reloc
= FALSE
;
4627 off
= h
->got
.offset
;
4629 && h
->plt
.offset
!= (bfd_vma
)-1
4630 && off
== (bfd_vma
)-1)
4632 /* We can't use h->got.offset here to save
4633 state, or even just remember the offset, as
4634 finish_dynamic_symbol would use that as offset into
4636 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4637 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4638 base_got
= htab
->elf
.sgotplt
;
4641 dyn
= htab
->elf
.dynamic_sections_created
;
4643 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4644 || (bfd_link_pic (info
)
4645 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4646 || (ELF_ST_VISIBILITY (h
->other
)
4647 && h
->root
.type
== bfd_link_hash_undefweak
))
4649 /* This is actually a static link, or it is a -Bsymbolic
4650 link and the symbol is defined locally, or the symbol
4651 was forced to be local because of a version file. We
4652 must initialize this entry in the global offset table.
4653 Since the offset must always be a multiple of 8, we
4654 use the least significant bit to record whether we
4655 have initialized it already.
4657 When doing a dynamic link, we create a .rela.got
4658 relocation entry to initialize the value. This is
4659 done in the finish_dynamic_symbol routine. */
4664 bfd_put_64 (output_bfd
, relocation
,
4665 base_got
->contents
+ off
);
4666 /* Note that this is harmless for the GOTPLT64 case,
4667 as -1 | 1 still is -1. */
4670 if (h
->dynindx
== -1
4672 && h
->root
.type
!= bfd_link_hash_undefweak
4673 && bfd_link_pic (info
))
4675 /* If this symbol isn't dynamic in PIC,
4676 generate R_X86_64_RELATIVE here. */
4677 eh
->no_finish_dynamic_symbol
= 1;
4678 relative_reloc
= TRUE
;
4683 unresolved_reloc
= FALSE
;
4687 if (local_got_offsets
== NULL
)
4690 off
= local_got_offsets
[r_symndx
];
4692 /* The offset must always be a multiple of 8. We use
4693 the least significant bit to record whether we have
4694 already generated the necessary reloc. */
4699 bfd_put_64 (output_bfd
, relocation
,
4700 base_got
->contents
+ off
);
4701 local_got_offsets
[r_symndx
] |= 1;
4703 if (bfd_link_pic (info
))
4704 relative_reloc
= TRUE
;
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 if (off
>= (bfd_vma
) -2)
4730 relocation
= base_got
->output_section
->vma
4731 + base_got
->output_offset
+ off
;
4732 if (r_type
!= R_X86_64_GOTPCREL
4733 && r_type
!= R_X86_64_GOTPCRELX
4734 && r_type
!= R_X86_64_REX_GOTPCRELX
4735 && r_type
!= R_X86_64_GOTPCREL64
)
4736 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4737 - htab
->elf
.sgotplt
->output_offset
;
4741 case R_X86_64_GOTOFF64
:
4742 /* Relocation is relative to the start of the global offset
4745 /* Check to make sure it isn't a protected function or data
4746 symbol for shared library since it may not be local when
4747 used as function address or with copy relocation. We also
4748 need to make sure that a symbol is referenced locally. */
4749 if (bfd_link_pic (info
) && h
)
4751 if (!h
->def_regular
)
4755 switch (ELF_ST_VISIBILITY (h
->other
))
4758 v
= _("hidden symbol");
4761 v
= _("internal symbol");
4764 v
= _("protected symbol");
4772 /* xgettext:c-format */
4773 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s"
4774 " `%s' can not be used when making a shared object"),
4775 input_bfd
, v
, h
->root
.root
.string
);
4776 bfd_set_error (bfd_error_bad_value
);
4779 else if (!bfd_link_executable (info
)
4780 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4781 && (h
->type
== STT_FUNC
4782 || h
->type
== STT_OBJECT
)
4783 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4786 /* xgettext:c-format */
4787 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s"
4788 " `%s' can not be used when making a shared object"),
4790 h
->type
== STT_FUNC
? "function" : "data",
4791 h
->root
.root
.string
);
4792 bfd_set_error (bfd_error_bad_value
);
4797 /* Note that sgot is not involved in this
4798 calculation. We always want the start of .got.plt. If we
4799 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4800 permitted by the ABI, we might have to change this
4802 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4803 + htab
->elf
.sgotplt
->output_offset
;
4806 case R_X86_64_GOTPC32
:
4807 case R_X86_64_GOTPC64
:
4808 /* Use global offset table as symbol value. */
4809 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4810 + htab
->elf
.sgotplt
->output_offset
;
4811 unresolved_reloc
= FALSE
;
4814 case R_X86_64_PLTOFF64
:
4815 /* Relocation is PLT entry relative to GOT. For local
4816 symbols it's the symbol itself relative to GOT. */
4818 /* See PLT32 handling. */
4819 && (h
->plt
.offset
!= (bfd_vma
) -1
4820 || eh
->plt_got
.offset
!= (bfd_vma
) -1)
4821 && htab
->elf
.splt
!= NULL
)
4823 if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
4825 /* Use the GOT PLT. */
4826 resolved_plt
= htab
->plt_got
;
4827 plt_offset
= eh
->plt_got
.offset
;
4829 else if (htab
->plt_bnd
!= NULL
)
4831 resolved_plt
= htab
->plt_bnd
;
4832 plt_offset
= eh
->plt_bnd
.offset
;
4836 resolved_plt
= htab
->elf
.splt
;
4837 plt_offset
= h
->plt
.offset
;
4840 relocation
= (resolved_plt
->output_section
->vma
4841 + resolved_plt
->output_offset
4843 unresolved_reloc
= FALSE
;
4846 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4847 + htab
->elf
.sgotplt
->output_offset
;
4850 case R_X86_64_PLT32
:
4851 case R_X86_64_PLT32_BND
:
4852 /* Relocation is to the entry for this symbol in the
4853 procedure linkage table. */
4855 /* Resolve a PLT32 reloc against a local symbol directly,
4856 without using the procedure linkage table. */
4860 if ((h
->plt
.offset
== (bfd_vma
) -1
4861 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4862 || htab
->elf
.splt
== NULL
)
4864 /* We didn't make a PLT entry for this symbol. This
4865 happens when statically linking PIC code, or when
4866 using -Bsymbolic. */
4870 if (h
->plt
.offset
!= (bfd_vma
) -1)
4872 if (htab
->plt_bnd
!= NULL
)
4874 resolved_plt
= htab
->plt_bnd
;
4875 plt_offset
= eh
->plt_bnd
.offset
;
4879 resolved_plt
= htab
->elf
.splt
;
4880 plt_offset
= h
->plt
.offset
;
4885 /* Use the GOT PLT. */
4886 resolved_plt
= htab
->plt_got
;
4887 plt_offset
= eh
->plt_got
.offset
;
4890 relocation
= (resolved_plt
->output_section
->vma
4891 + resolved_plt
->output_offset
4893 unresolved_reloc
= FALSE
;
4896 case R_X86_64_SIZE32
:
4897 case R_X86_64_SIZE64
:
4898 /* Set to symbol size. */
4899 relocation
= st_size
;
4905 case R_X86_64_PC32_BND
:
4906 /* Don't complain about -fPIC if the symbol is undefined when
4907 building executable unless it is unresolved weak symbol. */
4908 if ((input_section
->flags
& SEC_ALLOC
) != 0
4909 && (input_section
->flags
& SEC_READONLY
) != 0
4911 && ((bfd_link_executable (info
)
4912 && h
->root
.type
== bfd_link_hash_undefweak
4913 && !resolved_to_zero
)
4914 || (bfd_link_pic (info
)
4915 && !(bfd_link_pie (info
)
4916 && h
->root
.type
== bfd_link_hash_undefined
))))
4918 bfd_boolean fail
= FALSE
;
4920 = ((r_type
== R_X86_64_PC32
4921 || r_type
== R_X86_64_PC32_BND
)
4922 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4924 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4926 /* Symbol is referenced locally. Make sure it is
4927 defined locally or for a branch. */
4928 fail
= (!(h
->def_regular
|| ELF_COMMON_DEF_P (h
))
4931 else if (!(bfd_link_pie (info
)
4932 && (h
->needs_copy
|| eh
->needs_copy
)))
4934 /* Symbol doesn't need copy reloc and isn't referenced
4935 locally. We only allow branch to symbol with
4936 non-default visibility. */
4938 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4942 return elf_x86_64_need_pic (input_bfd
, input_section
,
4943 h
, NULL
, NULL
, howto
);
4952 /* FIXME: The ABI says the linker should make sure the value is
4953 the same when it's zeroextended to 64 bit. */
4956 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4959 /* Don't copy a pc-relative relocation into the output file
4960 if the symbol needs copy reloc or the symbol is undefined
4961 when building executable. Copy dynamic function pointer
4962 relocations. Don't generate dynamic relocations against
4963 resolved undefined weak symbols in PIE. */
4964 if ((bfd_link_pic (info
)
4965 && !(bfd_link_pie (info
)
4969 || h
->root
.type
== bfd_link_hash_undefined
)
4970 && (IS_X86_64_PCREL_TYPE (r_type
)
4971 || r_type
== R_X86_64_SIZE32
4972 || r_type
== R_X86_64_SIZE64
))
4974 || ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4975 && !resolved_to_zero
)
4976 || h
->root
.type
!= bfd_link_hash_undefweak
))
4977 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4978 && r_type
!= R_X86_64_SIZE32
4979 && r_type
!= R_X86_64_SIZE64
)
4980 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4981 || (ELIMINATE_COPY_RELOCS
4982 && !bfd_link_pic (info
)
4986 || eh
->func_pointer_refcount
> 0
4987 || (h
->root
.type
== bfd_link_hash_undefweak
4988 && !resolved_to_zero
))
4989 && ((h
->def_dynamic
&& !h
->def_regular
)
4990 /* Undefined weak symbol is bound locally when
4992 || h
->root
.type
== bfd_link_hash_undefined
)))
4994 Elf_Internal_Rela outrel
;
4995 bfd_boolean skip
, relocate
;
4998 /* When generating a shared object, these relocations
4999 are copied into the output file to be resolved at run
5005 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5007 if (outrel
.r_offset
== (bfd_vma
) -1)
5009 else if (outrel
.r_offset
== (bfd_vma
) -2)
5010 skip
= TRUE
, relocate
= TRUE
;
5012 outrel
.r_offset
+= (input_section
->output_section
->vma
5013 + input_section
->output_offset
);
5016 memset (&outrel
, 0, sizeof outrel
);
5018 /* h->dynindx may be -1 if this symbol was marked to
5022 && (IS_X86_64_PCREL_TYPE (r_type
)
5023 || !(bfd_link_executable (info
)
5024 || SYMBOLIC_BIND (info
, h
))
5025 || ! h
->def_regular
))
5027 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
5028 outrel
.r_addend
= rel
->r_addend
;
5032 /* This symbol is local, or marked to become local.
5033 When relocation overflow check is disabled, we
5034 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
5035 if (r_type
== htab
->pointer_r_type
5036 || (r_type
== R_X86_64_32
5037 && info
->no_reloc_overflow_check
))
5040 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5041 outrel
.r_addend
= relocation
+ rel
->r_addend
;
5043 else if (r_type
== R_X86_64_64
5044 && !ABI_64_P (output_bfd
))
5047 outrel
.r_info
= htab
->r_info (0,
5048 R_X86_64_RELATIVE64
);
5049 outrel
.r_addend
= relocation
+ rel
->r_addend
;
5050 /* Check addend overflow. */
5051 if ((outrel
.r_addend
& 0x80000000)
5052 != (rel
->r_addend
& 0x80000000))
5055 int addend
= rel
->r_addend
;
5056 if (h
&& h
->root
.root
.string
)
5057 name
= h
->root
.root
.string
;
5059 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
5063 /* xgettext:c-format */
5064 (_("%B: addend -0x%x in relocation %s against "
5065 "symbol `%s' at 0x%lx in section `%A' is "
5067 input_bfd
, addend
, howto
->name
, name
,
5068 (unsigned long) rel
->r_offset
, input_section
);
5071 /* xgettext:c-format */
5072 (_("%B: addend 0x%x in relocation %s against "
5073 "symbol `%s' at 0x%lx in section `%A' is "
5075 input_bfd
, addend
, howto
->name
, name
,
5076 (unsigned long) rel
->r_offset
, input_section
);
5077 bfd_set_error (bfd_error_bad_value
);
5085 if (bfd_is_abs_section (sec
))
5087 else if (sec
== NULL
|| sec
->owner
== NULL
)
5089 bfd_set_error (bfd_error_bad_value
);
5096 /* We are turning this relocation into one
5097 against a section symbol. It would be
5098 proper to subtract the symbol's value,
5099 osec->vma, from the emitted reloc addend,
5100 but ld.so expects buggy relocs. */
5101 osec
= sec
->output_section
;
5102 sindx
= elf_section_data (osec
)->dynindx
;
5105 asection
*oi
= htab
->elf
.text_index_section
;
5106 sindx
= elf_section_data (oi
)->dynindx
;
5108 BFD_ASSERT (sindx
!= 0);
5111 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
5112 outrel
.r_addend
= relocation
+ rel
->r_addend
;
5116 sreloc
= elf_section_data (input_section
)->sreloc
;
5118 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
5120 r
= bfd_reloc_notsupported
;
5121 goto check_relocation_error
;
5124 elf_append_rela (output_bfd
, sreloc
, &outrel
);
5126 /* If this reloc is against an external symbol, we do
5127 not want to fiddle with the addend. Otherwise, we
5128 need to include the symbol value so that it becomes
5129 an addend for the dynamic reloc. */
5136 case R_X86_64_TLSGD
:
5137 case R_X86_64_GOTPC32_TLSDESC
:
5138 case R_X86_64_TLSDESC_CALL
:
5139 case R_X86_64_GOTTPOFF
:
5140 tls_type
= GOT_UNKNOWN
;
5141 if (h
== NULL
&& local_got_offsets
)
5142 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
5144 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
5146 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5147 input_section
, contents
,
5148 symtab_hdr
, sym_hashes
,
5149 &r_type
, tls_type
, rel
,
5150 relend
, h
, r_symndx
, TRUE
))
5153 if (r_type
== R_X86_64_TPOFF32
)
5155 bfd_vma roff
= rel
->r_offset
;
5157 BFD_ASSERT (! unresolved_reloc
);
5159 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5161 /* GD->LE transition. For 64bit, change
5162 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5163 .word 0x6666; rex64; call __tls_get_addr@PLT
5165 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5167 call *__tls_get_addr@GOTPCREL(%rip)
5168 which may be converted to
5169 addr32 call __tls_get_addr
5172 leaq foo@tpoff(%rax), %rax
5174 leaq foo@tlsgd(%rip), %rdi
5175 .word 0x6666; rex64; call __tls_get_addr@PLT
5177 leaq foo@tlsgd(%rip), %rdi
5179 call *__tls_get_addr@GOTPCREL(%rip)
5180 which may be converted to
5181 addr32 call __tls_get_addr
5184 leaq foo@tpoff(%rax), %rax
5185 For largepic, change:
5186 leaq foo@tlsgd(%rip), %rdi
5187 movabsq $__tls_get_addr@pltoff, %rax
5192 leaq foo@tpoff(%rax), %rax
5193 nopw 0x0(%rax,%rax,1) */
5195 if (ABI_64_P (output_bfd
))
5197 if (contents
[roff
+ 5] == 0xb8)
5199 memcpy (contents
+ roff
- 3,
5200 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
5201 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5205 memcpy (contents
+ roff
- 4,
5206 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5210 memcpy (contents
+ roff
- 3,
5211 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5213 bfd_put_32 (output_bfd
,
5214 elf_x86_64_tpoff (info
, relocation
),
5215 contents
+ roff
+ 8 + largepic
);
5216 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
5217 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
5222 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5224 /* GDesc -> LE transition.
5225 It's originally something like:
5226 leaq x@tlsdesc(%rip), %rax
5229 movl $x@tpoff, %rax. */
5231 unsigned int val
, type
;
5233 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
5234 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
5235 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
5236 contents
+ roff
- 3);
5237 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
5238 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
5239 contents
+ roff
- 1);
5240 bfd_put_32 (output_bfd
,
5241 elf_x86_64_tpoff (info
, relocation
),
5245 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5247 /* GDesc -> LE transition.
5252 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5253 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5256 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
5258 /* IE->LE transition:
5259 For 64bit, originally it can be one of:
5260 movq foo@gottpoff(%rip), %reg
5261 addq foo@gottpoff(%rip), %reg
5264 leaq foo(%reg), %reg
5266 For 32bit, originally it can be one of:
5267 movq foo@gottpoff(%rip), %reg
5268 addl foo@gottpoff(%rip), %reg
5271 leal foo(%reg), %reg
5274 unsigned int val
, type
, reg
;
5277 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
5280 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
5281 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
5287 bfd_put_8 (output_bfd
, 0x49,
5288 contents
+ roff
- 3);
5289 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
5290 bfd_put_8 (output_bfd
, 0x41,
5291 contents
+ roff
- 3);
5292 bfd_put_8 (output_bfd
, 0xc7,
5293 contents
+ roff
- 2);
5294 bfd_put_8 (output_bfd
, 0xc0 | reg
,
5295 contents
+ roff
- 1);
5299 /* addq/addl -> addq/addl - addressing with %rsp/%r12
5302 bfd_put_8 (output_bfd
, 0x49,
5303 contents
+ roff
- 3);
5304 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
5305 bfd_put_8 (output_bfd
, 0x41,
5306 contents
+ roff
- 3);
5307 bfd_put_8 (output_bfd
, 0x81,
5308 contents
+ roff
- 2);
5309 bfd_put_8 (output_bfd
, 0xc0 | reg
,
5310 contents
+ roff
- 1);
5314 /* addq/addl -> leaq/leal */
5316 bfd_put_8 (output_bfd
, 0x4d,
5317 contents
+ roff
- 3);
5318 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
5319 bfd_put_8 (output_bfd
, 0x45,
5320 contents
+ roff
- 3);
5321 bfd_put_8 (output_bfd
, 0x8d,
5322 contents
+ roff
- 2);
5323 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
5324 contents
+ roff
- 1);
5326 bfd_put_32 (output_bfd
,
5327 elf_x86_64_tpoff (info
, relocation
),
5335 if (htab
->elf
.sgot
== NULL
)
5340 off
= h
->got
.offset
;
5341 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
5345 if (local_got_offsets
== NULL
)
5348 off
= local_got_offsets
[r_symndx
];
5349 offplt
= local_tlsdesc_gotents
[r_symndx
];
5356 Elf_Internal_Rela outrel
;
5360 if (htab
->elf
.srelgot
== NULL
)
5363 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
5365 if (GOT_TLS_GDESC_P (tls_type
))
5367 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
5368 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
5369 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
5370 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
5371 + htab
->elf
.sgotplt
->output_offset
5373 + htab
->sgotplt_jump_table_size
);
5374 sreloc
= htab
->elf
.srelplt
;
5376 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
5378 outrel
.r_addend
= 0;
5379 elf_append_rela (output_bfd
, sreloc
, &outrel
);
5382 sreloc
= htab
->elf
.srelgot
;
5384 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5385 + htab
->elf
.sgot
->output_offset
+ off
);
5387 if (GOT_TLS_GD_P (tls_type
))
5388 dr_type
= R_X86_64_DTPMOD64
;
5389 else if (GOT_TLS_GDESC_P (tls_type
))
5392 dr_type
= R_X86_64_TPOFF64
;
5394 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
5395 outrel
.r_addend
= 0;
5396 if ((dr_type
== R_X86_64_TPOFF64
5397 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
5398 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
5399 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
5401 elf_append_rela (output_bfd
, sreloc
, &outrel
);
5403 if (GOT_TLS_GD_P (tls_type
))
5407 BFD_ASSERT (! unresolved_reloc
);
5408 bfd_put_64 (output_bfd
,
5409 relocation
- elf_x86_64_dtpoff_base (info
),
5410 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5414 bfd_put_64 (output_bfd
, 0,
5415 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5416 outrel
.r_info
= htab
->r_info (indx
,
5418 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
5419 elf_append_rela (output_bfd
, sreloc
,
5428 local_got_offsets
[r_symndx
] |= 1;
5431 if (off
>= (bfd_vma
) -2
5432 && ! GOT_TLS_GDESC_P (tls_type
))
5434 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
5436 if (r_type
== R_X86_64_GOTPC32_TLSDESC
5437 || r_type
== R_X86_64_TLSDESC_CALL
)
5438 relocation
= htab
->elf
.sgotplt
->output_section
->vma
5439 + htab
->elf
.sgotplt
->output_offset
5440 + offplt
+ htab
->sgotplt_jump_table_size
;
5442 relocation
= htab
->elf
.sgot
->output_section
->vma
5443 + htab
->elf
.sgot
->output_offset
+ off
;
5444 unresolved_reloc
= FALSE
;
5448 bfd_vma roff
= rel
->r_offset
;
5450 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5452 /* GD->IE transition. For 64bit, change
5453 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5454 .word 0x6666; rex64; call __tls_get_addr@PLT
5456 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5458 call *__tls_get_addr@GOTPCREL(%rip
5459 which may be converted to
5460 addr32 call __tls_get_addr
5463 addq foo@gottpoff(%rip), %rax
5465 leaq foo@tlsgd(%rip), %rdi
5466 .word 0x6666; rex64; call __tls_get_addr@PLT
5468 leaq foo@tlsgd(%rip), %rdi
5470 call *__tls_get_addr@GOTPCREL(%rip)
5471 which may be converted to
5472 addr32 call __tls_get_addr
5475 addq foo@gottpoff(%rip), %rax
5476 For largepic, change:
5477 leaq foo@tlsgd(%rip), %rdi
5478 movabsq $__tls_get_addr@pltoff, %rax
5483 addq foo@gottpoff(%rax), %rax
5484 nopw 0x0(%rax,%rax,1) */
5486 if (ABI_64_P (output_bfd
))
5488 if (contents
[roff
+ 5] == 0xb8)
5490 memcpy (contents
+ roff
- 3,
5491 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5492 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5496 memcpy (contents
+ roff
- 4,
5497 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5501 memcpy (contents
+ roff
- 3,
5502 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5505 relocation
= (htab
->elf
.sgot
->output_section
->vma
5506 + htab
->elf
.sgot
->output_offset
+ off
5509 - input_section
->output_section
->vma
5510 - input_section
->output_offset
5512 bfd_put_32 (output_bfd
, relocation
,
5513 contents
+ roff
+ 8 + largepic
);
5514 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5519 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5521 /* GDesc -> IE transition.
5522 It's originally something like:
5523 leaq x@tlsdesc(%rip), %rax
5526 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5528 /* Now modify the instruction as appropriate. To
5529 turn a leaq into a movq in the form we use it, it
5530 suffices to change the second byte from 0x8d to
5532 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
5534 bfd_put_32 (output_bfd
,
5535 htab
->elf
.sgot
->output_section
->vma
5536 + htab
->elf
.sgot
->output_offset
+ off
5538 - input_section
->output_section
->vma
5539 - input_section
->output_offset
5544 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5546 /* GDesc -> IE transition.
5553 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5554 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5562 case R_X86_64_TLSLD
:
5563 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5564 input_section
, contents
,
5565 symtab_hdr
, sym_hashes
,
5566 &r_type
, GOT_UNKNOWN
, rel
,
5567 relend
, h
, r_symndx
, TRUE
))
5570 if (r_type
!= R_X86_64_TLSLD
)
5572 /* LD->LE transition:
5573 leaq foo@tlsld(%rip), %rdi
5574 call __tls_get_addr@PLT
5575 For 64bit, we change it into:
5576 .word 0x6666; .byte 0x66; movq %fs:0, %rax
5577 For 32bit, we change it into:
5578 nopl 0x0(%rax); movl %fs:0, %eax
5580 leaq foo@tlsld(%rip), %rdi;
5581 call *__tls_get_addr@GOTPCREL(%rip)
5582 which may be converted to
5583 addr32 call __tls_get_addr
5584 For 64bit, we change it into:
5585 .word 0x6666; .word 0x6666; movq %fs:0, %rax
5586 For 32bit, we change it into:
5587 nopw 0x0(%rax); movl %fs:0, %eax
5588 For largepic, change:
5589 leaq foo@tlsgd(%rip), %rdi
5590 movabsq $__tls_get_addr@pltoff, %rax
5594 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
5597 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
5598 if (ABI_64_P (output_bfd
))
5600 if (contents
[rel
->r_offset
+ 5] == 0xb8)
5601 memcpy (contents
+ rel
->r_offset
- 3,
5602 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5603 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5604 else if (contents
[rel
->r_offset
+ 4] == 0xff
5605 || contents
[rel
->r_offset
+ 4] == 0x67)
5606 memcpy (contents
+ rel
->r_offset
- 3,
5607 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
5610 memcpy (contents
+ rel
->r_offset
- 3,
5611 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5615 if (contents
[rel
->r_offset
+ 4] == 0xff)
5616 memcpy (contents
+ rel
->r_offset
- 3,
5617 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
5620 memcpy (contents
+ rel
->r_offset
- 3,
5621 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5623 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
5624 and R_X86_64_PLTOFF64. */
5630 if (htab
->elf
.sgot
== NULL
)
5633 off
= htab
->tls_ld_got
.offset
;
5638 Elf_Internal_Rela outrel
;
5640 if (htab
->elf
.srelgot
== NULL
)
5643 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5644 + htab
->elf
.sgot
->output_offset
+ off
);
5646 bfd_put_64 (output_bfd
, 0,
5647 htab
->elf
.sgot
->contents
+ off
);
5648 bfd_put_64 (output_bfd
, 0,
5649 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5650 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5651 outrel
.r_addend
= 0;
5652 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5654 htab
->tls_ld_got
.offset
|= 1;
5656 relocation
= htab
->elf
.sgot
->output_section
->vma
5657 + htab
->elf
.sgot
->output_offset
+ off
;
5658 unresolved_reloc
= FALSE
;
5661 case R_X86_64_DTPOFF32
:
5662 if (!bfd_link_executable (info
)
5663 || (input_section
->flags
& SEC_CODE
) == 0)
5664 relocation
-= elf_x86_64_dtpoff_base (info
);
5666 relocation
= elf_x86_64_tpoff (info
, relocation
);
5669 case R_X86_64_TPOFF32
:
5670 case R_X86_64_TPOFF64
:
5671 BFD_ASSERT (bfd_link_executable (info
));
5672 relocation
= elf_x86_64_tpoff (info
, relocation
);
5675 case R_X86_64_DTPOFF64
:
5676 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5677 relocation
-= elf_x86_64_dtpoff_base (info
);
5684 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5685 because such sections are not SEC_ALLOC and thus ld.so will
5686 not process them. */
5687 if (unresolved_reloc
5688 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5690 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5691 rel
->r_offset
) != (bfd_vma
) -1)
5694 /* xgettext:c-format */
5695 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5698 (long) rel
->r_offset
,
5700 h
->root
.root
.string
);
5705 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5706 contents
, rel
->r_offset
,
5707 relocation
, rel
->r_addend
);
5709 check_relocation_error
:
5710 if (r
!= bfd_reloc_ok
)
5715 name
= h
->root
.root
.string
;
5718 name
= bfd_elf_string_from_elf_section (input_bfd
,
5719 symtab_hdr
->sh_link
,
5724 name
= bfd_section_name (input_bfd
, sec
);
5727 if (r
== bfd_reloc_overflow
)
5728 (*info
->callbacks
->reloc_overflow
)
5729 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5730 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
5734 /* xgettext:c-format */
5735 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5736 input_bfd
, input_section
,
5737 (long) rel
->r_offset
, name
, (int) r
);
5748 Elf_Internal_Shdr
*rel_hdr
;
5749 size_t deleted
= rel
- wrel
;
5751 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
5752 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5753 if (rel_hdr
->sh_size
== 0)
5755 /* It is too late to remove an empty reloc section. Leave
5757 ??? What is wrong with an empty section??? */
5758 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
5761 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
5762 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5763 input_section
->reloc_count
-= deleted
;
5769 /* Finish up dynamic symbol handling. We set the contents of various
5770 dynamic sections here. */
5773 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5774 struct bfd_link_info
*info
,
5775 struct elf_link_hash_entry
*h
,
5776 Elf_Internal_Sym
*sym
)
5778 struct elf_x86_64_link_hash_table
*htab
;
5779 const struct elf_x86_64_backend_data
*abed
;
5780 bfd_boolean use_plt_bnd
;
5781 struct elf_x86_64_link_hash_entry
*eh
;
5782 bfd_boolean local_undefweak
;
5784 htab
= elf_x86_64_hash_table (info
);
5788 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5789 section only if there is .plt section. */
5790 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5792 ? &elf_x86_64_bnd_arch_bed
5793 : get_elf_x86_64_backend_data (output_bfd
));
5795 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5796 if (eh
->no_finish_dynamic_symbol
)
5799 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5800 resolved undefined weak symbols in executable so that their
5801 references have value 0 at run-time. */
5802 local_undefweak
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
5806 if (h
->plt
.offset
!= (bfd_vma
) -1)
5809 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5810 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5811 Elf_Internal_Rela rela
;
5813 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5814 const struct elf_backend_data
*bed
;
5815 bfd_vma plt_got_pcrel_offset
;
5817 /* When building a static executable, use .iplt, .igot.plt and
5818 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5819 if (htab
->elf
.splt
!= NULL
)
5821 plt
= htab
->elf
.splt
;
5822 gotplt
= htab
->elf
.sgotplt
;
5823 relplt
= htab
->elf
.srelplt
;
5827 plt
= htab
->elf
.iplt
;
5828 gotplt
= htab
->elf
.igotplt
;
5829 relplt
= htab
->elf
.irelplt
;
5832 /* This symbol has an entry in the procedure linkage table. Set
5834 if ((h
->dynindx
== -1
5836 && !((h
->forced_local
|| bfd_link_executable (info
))
5838 && h
->type
== STT_GNU_IFUNC
))
5844 /* Get the index in the procedure linkage table which
5845 corresponds to this symbol. This is the index of this symbol
5846 in all the symbols for which we are making plt entries. The
5847 first entry in the procedure linkage table is reserved.
5849 Get the offset into the .got table of the entry that
5850 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5851 bytes. The first three are reserved for the dynamic linker.
5853 For static executables, we don't reserve anything. */
5855 if (plt
== htab
->elf
.splt
)
5857 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5858 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5862 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5863 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5866 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5867 plt_plt_offset
= abed
->plt_plt_offset
;
5868 plt_got_insn_size
= abed
->plt_got_insn_size
;
5869 plt_got_offset
= abed
->plt_got_offset
;
5872 /* Use the second PLT with BND relocations. */
5873 const bfd_byte
*plt_entry
, *plt2_entry
;
5877 plt_entry
= elf_x86_64_bnd_plt_entry
;
5878 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5882 plt_entry
= elf_x86_64_legacy_plt_entry
;
5883 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5885 /* Subtract 1 since there is no BND prefix. */
5886 plt_plt_insn_end
-= 1;
5887 plt_plt_offset
-= 1;
5888 plt_got_insn_size
-= 1;
5889 plt_got_offset
-= 1;
5892 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5893 == sizeof (elf_x86_64_legacy_plt_entry
));
5895 /* Fill in the entry in the procedure linkage table. */
5896 memcpy (plt
->contents
+ h
->plt
.offset
,
5897 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5898 /* Fill in the entry in the second PLT. */
5899 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5900 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5902 resolved_plt
= htab
->plt_bnd
;
5903 plt_offset
= eh
->plt_bnd
.offset
;
5907 /* Fill in the entry in the procedure linkage table. */
5908 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5909 abed
->plt_entry_size
);
5912 plt_offset
= h
->plt
.offset
;
5915 /* Insert the relocation positions of the plt section. */
5917 /* Put offset the PC-relative instruction referring to the GOT entry,
5918 subtracting the size of that instruction. */
5919 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5920 + gotplt
->output_offset
5922 - resolved_plt
->output_section
->vma
5923 - resolved_plt
->output_offset
5925 - plt_got_insn_size
);
5927 /* Check PC-relative offset overflow in PLT entry. */
5928 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5929 /* xgettext:c-format */
5930 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5931 output_bfd
, h
->root
.root
.string
);
5933 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5934 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5936 /* Fill in the entry in the global offset table, initially this
5937 points to the second part of the PLT entry. Leave the entry
5938 as zero for undefined weak symbol in PIE. No PLT relocation
5939 against undefined weak symbol in PIE. */
5940 if (!local_undefweak
)
5942 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5943 + plt
->output_offset
5945 + abed
->plt_lazy_offset
),
5946 gotplt
->contents
+ got_offset
);
5948 /* Fill in the entry in the .rela.plt section. */
5949 rela
.r_offset
= (gotplt
->output_section
->vma
5950 + gotplt
->output_offset
5952 if (h
->dynindx
== -1
5953 || ((bfd_link_executable (info
)
5954 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5956 && h
->type
== STT_GNU_IFUNC
))
5958 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5959 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5960 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5961 rela
.r_addend
= (h
->root
.u
.def
.value
5962 + h
->root
.u
.def
.section
->output_section
->vma
5963 + h
->root
.u
.def
.section
->output_offset
);
5964 /* R_X86_64_IRELATIVE comes last. */
5965 plt_index
= htab
->next_irelative_index
--;
5969 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5971 plt_index
= htab
->next_jump_slot_index
++;
5974 /* Don't fill PLT entry for static executables. */
5975 if (plt
== htab
->elf
.splt
)
5977 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5979 /* Put relocation index. */
5980 bfd_put_32 (output_bfd
, plt_index
,
5981 (plt
->contents
+ h
->plt
.offset
5982 + abed
->plt_reloc_offset
));
5984 /* Put offset for jmp .PLT0 and check for overflow. We don't
5985 check relocation index for overflow since branch displacement
5986 will overflow first. */
5987 if (plt0_offset
> 0x80000000)
5988 /* xgettext:c-format */
5989 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5990 output_bfd
, h
->root
.root
.string
);
5991 bfd_put_32 (output_bfd
, - plt0_offset
,
5992 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5995 bed
= get_elf_backend_data (output_bfd
);
5996 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5997 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
6000 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
6002 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
6003 asection
*plt
, *got
;
6004 bfd_boolean got_after_plt
;
6005 int32_t got_pcrel_offset
;
6006 const bfd_byte
*got_plt_entry
;
6008 /* Set the entry in the GOT procedure linkage table. */
6009 plt
= htab
->plt_got
;
6010 got
= htab
->elf
.sgot
;
6011 got_offset
= h
->got
.offset
;
6013 if (got_offset
== (bfd_vma
) -1
6014 || (h
->type
== STT_GNU_IFUNC
&& h
->def_regular
)
6019 /* Use the second PLT entry template for the GOT PLT since they
6020 are the identical. */
6021 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
6022 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
6024 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
6027 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
6029 /* Subtract 1 since there is no BND prefix. */
6030 plt_got_insn_size
-= 1;
6031 plt_got_offset
-= 1;
6034 /* Fill in the entry in the GOT procedure linkage table. */
6035 plt_offset
= eh
->plt_got
.offset
;
6036 memcpy (plt
->contents
+ plt_offset
,
6037 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
6039 /* Put offset the PC-relative instruction referring to the GOT
6040 entry, subtracting the size of that instruction. */
6041 got_pcrel_offset
= (got
->output_section
->vma
6042 + got
->output_offset
6044 - plt
->output_section
->vma
6045 - plt
->output_offset
6047 - plt_got_insn_size
);
6049 /* Check PC-relative offset overflow in GOT PLT entry. */
6050 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
6051 if ((got_after_plt
&& got_pcrel_offset
< 0)
6052 || (!got_after_plt
&& got_pcrel_offset
> 0))
6053 /* xgettext:c-format */
6054 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
6055 output_bfd
, h
->root
.root
.string
);
6057 bfd_put_32 (output_bfd
, got_pcrel_offset
,
6058 plt
->contents
+ plt_offset
+ plt_got_offset
);
6061 if (!local_undefweak
6063 && (h
->plt
.offset
!= (bfd_vma
) -1
6064 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
6066 /* Mark the symbol as undefined, rather than as defined in
6067 the .plt section. Leave the value if there were any
6068 relocations where pointer equality matters (this is a clue
6069 for the dynamic linker, to make function pointer
6070 comparisons work between an application and shared
6071 library), otherwise set it to zero. If a function is only
6072 called from a binary, there is no need to slow down
6073 shared libraries because of that. */
6074 sym
->st_shndx
= SHN_UNDEF
;
6075 if (!h
->pointer_equality_needed
)
6079 /* Don't generate dynamic GOT relocation against undefined weak
6080 symbol in executable. */
6081 if (h
->got
.offset
!= (bfd_vma
) -1
6082 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
6083 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
6084 && !local_undefweak
)
6086 Elf_Internal_Rela rela
;
6087 asection
*relgot
= htab
->elf
.srelgot
;
6089 /* This symbol has an entry in the global offset table. Set it
6091 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
6094 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
6095 + htab
->elf
.sgot
->output_offset
6096 + (h
->got
.offset
&~ (bfd_vma
) 1));
6098 /* If this is a static link, or it is a -Bsymbolic link and the
6099 symbol is defined locally or was forced to be local because
6100 of a version file, we just want to emit a RELATIVE reloc.
6101 The entry in the global offset table will already have been
6102 initialized in the relocate_section function. */
6104 && h
->type
== STT_GNU_IFUNC
)
6106 if (h
->plt
.offset
== (bfd_vma
) -1)
6108 /* STT_GNU_IFUNC is referenced without PLT. */
6109 if (htab
->elf
.splt
== NULL
)
6111 /* use .rel[a].iplt section to store .got relocations
6112 in static executable. */
6113 relgot
= htab
->elf
.irelplt
;
6115 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
6117 rela
.r_info
= htab
->r_info (0,
6118 R_X86_64_IRELATIVE
);
6119 rela
.r_addend
= (h
->root
.u
.def
.value
6120 + h
->root
.u
.def
.section
->output_section
->vma
6121 + h
->root
.u
.def
.section
->output_offset
);
6126 else if (bfd_link_pic (info
))
6128 /* Generate R_X86_64_GLOB_DAT. */
6135 if (!h
->pointer_equality_needed
)
6138 /* For non-shared object, we can't use .got.plt, which
6139 contains the real function addres if we need pointer
6140 equality. We load the GOT entry with the PLT entry. */
6141 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
6142 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
6143 + plt
->output_offset
6145 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
6149 else if (bfd_link_pic (info
)
6150 && SYMBOL_REFERENCES_LOCAL (info
, h
))
6152 if (!h
->def_regular
)
6154 BFD_ASSERT((h
->got
.offset
& 1) != 0);
6155 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
6156 rela
.r_addend
= (h
->root
.u
.def
.value
6157 + h
->root
.u
.def
.section
->output_section
->vma
6158 + h
->root
.u
.def
.section
->output_offset
);
6162 BFD_ASSERT((h
->got
.offset
& 1) == 0);
6164 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
6165 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
6166 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
6170 elf_append_rela (output_bfd
, relgot
, &rela
);
6175 Elf_Internal_Rela rela
;
6178 /* This symbol needs a copy reloc. Set it up. */
6180 if (h
->dynindx
== -1
6181 || (h
->root
.type
!= bfd_link_hash_defined
6182 && h
->root
.type
!= bfd_link_hash_defweak
)
6183 || htab
->elf
.srelbss
== NULL
6184 || htab
->elf
.sreldynrelro
== NULL
)
6187 rela
.r_offset
= (h
->root
.u
.def
.value
6188 + h
->root
.u
.def
.section
->output_section
->vma
6189 + h
->root
.u
.def
.section
->output_offset
);
6190 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
6192 if (h
->root
.u
.def
.section
== htab
->elf
.sdynrelro
)
6193 s
= htab
->elf
.sreldynrelro
;
6195 s
= htab
->elf
.srelbss
;
6196 elf_append_rela (output_bfd
, s
, &rela
);
6202 /* Finish up local dynamic symbol handling. We set the contents of
6203 various dynamic sections here. */
6206 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
6208 struct elf_link_hash_entry
*h
6209 = (struct elf_link_hash_entry
*) *slot
;
6210 struct bfd_link_info
*info
6211 = (struct bfd_link_info
*) inf
;
6213 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
6217 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
6218 here since undefined weak symbol may not be dynamic and may not be
6219 called for elf_x86_64_finish_dynamic_symbol. */
6222 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry
*bh
,
6225 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
6226 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
6228 if (h
->root
.type
!= bfd_link_hash_undefweak
6229 || h
->dynindx
!= -1)
6232 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
6236 /* Used to decide how to sort relocs in an optimal manner for the
6237 dynamic linker, before writing them out. */
6239 static enum elf_reloc_type_class
6240 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
6241 const asection
*rel_sec ATTRIBUTE_UNUSED
,
6242 const Elf_Internal_Rela
*rela
)
6244 bfd
*abfd
= info
->output_bfd
;
6245 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6246 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
6248 if (htab
->elf
.dynsym
!= NULL
6249 && htab
->elf
.dynsym
->contents
!= NULL
)
6251 /* Check relocation against STT_GNU_IFUNC symbol if there are
6253 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
6254 if (r_symndx
!= STN_UNDEF
)
6256 Elf_Internal_Sym sym
;
6257 if (!bed
->s
->swap_symbol_in (abfd
,
6258 (htab
->elf
.dynsym
->contents
6259 + r_symndx
* bed
->s
->sizeof_sym
),
6263 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
6264 return reloc_class_ifunc
;
6268 switch ((int) ELF32_R_TYPE (rela
->r_info
))
6270 case R_X86_64_IRELATIVE
:
6271 return reloc_class_ifunc
;
6272 case R_X86_64_RELATIVE
:
6273 case R_X86_64_RELATIVE64
:
6274 return reloc_class_relative
;
6275 case R_X86_64_JUMP_SLOT
:
6276 return reloc_class_plt
;
6278 return reloc_class_copy
;
6280 return reloc_class_normal
;
6284 /* Finish up the dynamic sections. */
6287 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
6288 struct bfd_link_info
*info
)
6290 struct elf_x86_64_link_hash_table
*htab
;
6293 const struct elf_x86_64_backend_data
*abed
;
6295 htab
= elf_x86_64_hash_table (info
);
6299 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
6300 section only if there is .plt section. */
6301 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
6302 ? &elf_x86_64_bnd_arch_bed
6303 : get_elf_x86_64_backend_data (output_bfd
));
6305 dynobj
= htab
->elf
.dynobj
;
6306 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
6308 if (htab
->elf
.dynamic_sections_created
)
6310 bfd_byte
*dyncon
, *dynconend
;
6311 const struct elf_backend_data
*bed
;
6312 bfd_size_type sizeof_dyn
;
6314 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
6317 bed
= get_elf_backend_data (dynobj
);
6318 sizeof_dyn
= bed
->s
->sizeof_dyn
;
6319 dyncon
= sdyn
->contents
;
6320 dynconend
= sdyn
->contents
+ sdyn
->size
;
6321 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
6323 Elf_Internal_Dyn dyn
;
6326 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
6334 s
= htab
->elf
.sgotplt
;
6335 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
6339 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
6343 s
= htab
->elf
.srelplt
->output_section
;
6344 dyn
.d_un
.d_val
= s
->size
;
6347 case DT_TLSDESC_PLT
:
6349 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
6350 + htab
->tlsdesc_plt
;
6353 case DT_TLSDESC_GOT
:
6355 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
6356 + htab
->tlsdesc_got
;
6360 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
6363 /* Fill in the special first entry in the procedure linkage table. */
6364 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
6366 /* Fill in the first entry in the procedure linkage table. */
6367 memcpy (htab
->elf
.splt
->contents
,
6368 abed
->plt0_entry
, abed
->plt_entry_size
);
6369 /* Add offset for pushq GOT+8(%rip), since the instruction
6370 uses 6 bytes subtract this value. */
6371 bfd_put_32 (output_bfd
,
6372 (htab
->elf
.sgotplt
->output_section
->vma
6373 + htab
->elf
.sgotplt
->output_offset
6375 - htab
->elf
.splt
->output_section
->vma
6376 - htab
->elf
.splt
->output_offset
6378 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
6379 /* Add offset for the PC-relative instruction accessing GOT+16,
6380 subtracting the offset to the end of that instruction. */
6381 bfd_put_32 (output_bfd
,
6382 (htab
->elf
.sgotplt
->output_section
->vma
6383 + htab
->elf
.sgotplt
->output_offset
6385 - htab
->elf
.splt
->output_section
->vma
6386 - htab
->elf
.splt
->output_offset
6387 - abed
->plt0_got2_insn_end
),
6388 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
6390 elf_section_data (htab
->elf
.splt
->output_section
)
6391 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
6393 if (htab
->tlsdesc_plt
)
6395 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
6396 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
6398 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
6399 abed
->plt0_entry
, abed
->plt_entry_size
);
6401 /* Add offset for pushq GOT+8(%rip), since the
6402 instruction uses 6 bytes subtract this value. */
6403 bfd_put_32 (output_bfd
,
6404 (htab
->elf
.sgotplt
->output_section
->vma
6405 + htab
->elf
.sgotplt
->output_offset
6407 - htab
->elf
.splt
->output_section
->vma
6408 - htab
->elf
.splt
->output_offset
6411 htab
->elf
.splt
->contents
6412 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
6413 /* Add offset for the PC-relative instruction accessing GOT+TDG,
6414 where TGD stands for htab->tlsdesc_got, subtracting the offset
6415 to the end of that instruction. */
6416 bfd_put_32 (output_bfd
,
6417 (htab
->elf
.sgot
->output_section
->vma
6418 + htab
->elf
.sgot
->output_offset
6420 - htab
->elf
.splt
->output_section
->vma
6421 - htab
->elf
.splt
->output_offset
6423 - abed
->plt0_got2_insn_end
),
6424 htab
->elf
.splt
->contents
6425 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
6430 if (htab
->plt_bnd
!= NULL
)
6431 elf_section_data (htab
->plt_bnd
->output_section
)
6432 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
6434 if (htab
->elf
.sgotplt
)
6436 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
6439 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
6443 /* Fill in the first three entries in the global offset table. */
6444 if (htab
->elf
.sgotplt
->size
> 0)
6446 /* Set the first entry in the global offset table to the address of
6447 the dynamic section. */
6449 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
6451 bfd_put_64 (output_bfd
,
6452 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
6453 htab
->elf
.sgotplt
->contents
);
6454 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
6455 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
6456 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
6459 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
6463 /* Adjust .eh_frame for .plt section. */
6464 if (htab
->plt_eh_frame
!= NULL
6465 && htab
->plt_eh_frame
->contents
!= NULL
)
6467 if (htab
->elf
.splt
!= NULL
6468 && htab
->elf
.splt
->size
!= 0
6469 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
6470 && htab
->elf
.splt
->output_section
!= NULL
6471 && htab
->plt_eh_frame
->output_section
!= NULL
)
6473 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
6474 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
6475 + htab
->plt_eh_frame
->output_offset
6476 + PLT_FDE_START_OFFSET
;
6477 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6478 htab
->plt_eh_frame
->contents
6479 + PLT_FDE_START_OFFSET
);
6481 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
6483 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6485 htab
->plt_eh_frame
->contents
))
6490 /* Adjust .eh_frame for .plt.got section. */
6491 if (htab
->plt_got_eh_frame
!= NULL
6492 && htab
->plt_got_eh_frame
->contents
!= NULL
)
6494 if (htab
->plt_got
!= NULL
6495 && htab
->plt_got
->size
!= 0
6496 && (htab
->plt_got
->flags
& SEC_EXCLUDE
) == 0
6497 && htab
->plt_got
->output_section
!= NULL
6498 && htab
->plt_got_eh_frame
->output_section
!= NULL
)
6500 bfd_vma plt_start
= htab
->plt_got
->output_section
->vma
;
6501 bfd_vma eh_frame_start
= htab
->plt_got_eh_frame
->output_section
->vma
6502 + htab
->plt_got_eh_frame
->output_offset
6503 + PLT_FDE_START_OFFSET
;
6504 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6505 htab
->plt_got_eh_frame
->contents
6506 + PLT_FDE_START_OFFSET
);
6508 if (htab
->plt_got_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
6510 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6511 htab
->plt_got_eh_frame
,
6512 htab
->plt_got_eh_frame
->contents
))
6517 /* Adjust .eh_frame for .plt.bnd section. */
6518 if (htab
->plt_bnd_eh_frame
!= NULL
6519 && htab
->plt_bnd_eh_frame
->contents
!= NULL
)
6521 if (htab
->plt_bnd
!= NULL
6522 && htab
->plt_bnd
->size
!= 0
6523 && (htab
->plt_bnd
->flags
& SEC_EXCLUDE
) == 0
6524 && htab
->plt_bnd
->output_section
!= NULL
6525 && htab
->plt_bnd_eh_frame
->output_section
!= NULL
)
6527 bfd_vma plt_start
= htab
->plt_bnd
->output_section
->vma
;
6528 bfd_vma eh_frame_start
= htab
->plt_bnd_eh_frame
->output_section
->vma
6529 + htab
->plt_bnd_eh_frame
->output_offset
6530 + PLT_FDE_START_OFFSET
;
6531 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
6532 htab
->plt_bnd_eh_frame
->contents
6533 + PLT_FDE_START_OFFSET
);
6535 if (htab
->plt_bnd_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
6537 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
6538 htab
->plt_bnd_eh_frame
,
6539 htab
->plt_bnd_eh_frame
->contents
))
6544 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
6545 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
6548 /* Fill PLT entries for undefined weak symbols in PIE. */
6549 if (bfd_link_pie (info
))
6550 bfd_hash_traverse (&info
->hash
->table
,
6551 elf_x86_64_pie_finish_undefweak_symbol
,
6557 /* Fill PLT/GOT entries and allocate dynamic relocations for local
6558 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6559 It has to be done before elf_link_sort_relocs is called so that
6560 dynamic relocations are properly sorted. */
6563 elf_x86_64_output_arch_local_syms
6564 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
6565 struct bfd_link_info
*info
,
6566 void *flaginfo ATTRIBUTE_UNUSED
,
6567 int (*func
) (void *, const char *,
6570 struct elf_link_hash_entry
*) ATTRIBUTE_UNUSED
)
6572 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
6576 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6577 htab_traverse (htab
->loc_hash_table
,
6578 elf_x86_64_finish_local_dynamic_symbol
,
6584 /* Return an array of PLT entry symbol values. */
6587 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
6590 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
6593 bfd_vma
*plt_sym_val
;
6595 bfd_byte
*plt_contents
;
6596 const struct elf_x86_64_backend_data
*bed
;
6597 Elf_Internal_Shdr
*hdr
;
6600 /* Get the .plt section contents. PLT passed down may point to the
6601 .plt.bnd section. Make sure that PLT always points to the .plt
6603 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6608 plt
= bfd_get_section_by_name (abfd
, ".plt");
6611 bed
= &elf_x86_64_bnd_arch_bed
;
6614 bed
= get_elf_x86_64_backend_data (abfd
);
6616 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
6617 if (plt_contents
== NULL
)
6619 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
6620 plt_contents
, 0, plt
->size
))
6623 free (plt_contents
);
6627 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
6628 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
6631 hdr
= &elf_section_data (relplt
)->this_hdr
;
6632 count
= relplt
->size
/ hdr
->sh_entsize
;
6634 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
6635 if (plt_sym_val
== NULL
)
6638 for (i
= 0; i
< count
; i
++)
6639 plt_sym_val
[i
] = -1;
6641 plt_offset
= bed
->plt_entry_size
;
6642 p
= relplt
->relocation
;
6643 for (i
= 0; i
< count
; i
++, p
++)
6647 /* Skip unknown relocation. */
6648 if (p
->howto
== NULL
)
6651 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
6652 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
6655 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
6656 + bed
->plt_reloc_offset
));
6657 if (reloc_index
< count
)
6661 /* This is the index in .plt section. */
6662 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
6663 /* Store VMA + the offset in .plt.bnd section. */
6664 plt_sym_val
[reloc_index
] =
6666 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
6669 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
6671 plt_offset
+= bed
->plt_entry_size
;
6673 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6675 if (plt_offset
>= plt
->size
)
6679 free (plt_contents
);
6684 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6688 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
6695 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6696 as PLT if it exists. */
6697 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6699 plt
= bfd_get_section_by_name (abfd
, ".plt");
6700 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
6701 dynsymcount
, dynsyms
, ret
,
6703 elf_x86_64_get_plt_sym_val
);
6706 /* Handle an x86-64 specific section when reading an object file. This
6707 is called when elfcode.h finds a section with an unknown type. */
6710 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
6711 const char *name
, int shindex
)
6713 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
6716 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
6722 /* Hook called by the linker routine which adds symbols from an object
6723 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6727 elf_x86_64_add_symbol_hook (bfd
*abfd
,
6728 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6729 Elf_Internal_Sym
*sym
,
6730 const char **namep ATTRIBUTE_UNUSED
,
6731 flagword
*flagsp ATTRIBUTE_UNUSED
,
6737 switch (sym
->st_shndx
)
6739 case SHN_X86_64_LCOMMON
:
6740 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
6743 lcomm
= bfd_make_section_with_flags (abfd
,
6747 | SEC_LINKER_CREATED
));
6750 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
6753 *valp
= sym
->st_size
;
6761 /* Given a BFD section, try to locate the corresponding ELF section
6765 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
6766 asection
*sec
, int *index_return
)
6768 if (sec
== &_bfd_elf_large_com_section
)
6770 *index_return
= SHN_X86_64_LCOMMON
;
6776 /* Process a symbol. */
6779 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
6782 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
6784 switch (elfsym
->internal_elf_sym
.st_shndx
)
6786 case SHN_X86_64_LCOMMON
:
6787 asym
->section
= &_bfd_elf_large_com_section
;
6788 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6789 /* Common symbol doesn't set BSF_GLOBAL. */
6790 asym
->flags
&= ~BSF_GLOBAL
;
6796 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6798 return (sym
->st_shndx
== SHN_COMMON
6799 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6803 elf_x86_64_common_section_index (asection
*sec
)
6805 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6808 return SHN_X86_64_LCOMMON
;
6812 elf_x86_64_common_section (asection
*sec
)
6814 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6815 return bfd_com_section_ptr
;
6817 return &_bfd_elf_large_com_section
;
6821 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6822 const Elf_Internal_Sym
*sym
,
6827 const asection
*oldsec
)
6829 /* A normal common symbol and a large common symbol result in a
6830 normal common symbol. We turn the large common symbol into a
6833 && h
->root
.type
== bfd_link_hash_common
6835 && bfd_is_com_section (*psec
)
6838 if (sym
->st_shndx
== SHN_COMMON
6839 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6841 h
->root
.u
.c
.p
->section
6842 = bfd_make_section_old_way (oldbfd
, "COMMON");
6843 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6845 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6846 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6847 *psec
= bfd_com_section_ptr
;
6854 elf_x86_64_additional_program_headers (bfd
*abfd
,
6855 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6860 /* Check to see if we need a large readonly segment. */
6861 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6862 if (s
&& (s
->flags
& SEC_LOAD
))
6865 /* Check to see if we need a large data segment. Since .lbss sections
6866 is placed right after the .bss section, there should be no need for
6867 a large data segment just because of .lbss. */
6868 s
= bfd_get_section_by_name (abfd
, ".ldata");
6869 if (s
&& (s
->flags
& SEC_LOAD
))
6875 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6878 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6880 if (h
->plt
.offset
!= (bfd_vma
) -1
6882 && !h
->pointer_equality_needed
)
6885 return _bfd_elf_hash_symbol (h
);
6888 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6891 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6892 const bfd_target
*output
)
6894 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6895 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6896 && _bfd_elf_relocs_compatible (input
, output
));
6899 /* Parse x86-64 GNU properties. */
6901 static enum elf_property_kind
6902 elf_x86_64_parse_gnu_properties (bfd
*abfd
, unsigned int type
,
6903 bfd_byte
*ptr
, unsigned int datasz
)
6909 case GNU_PROPERTY_X86_ISA_1_USED
:
6910 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
6914 ((type
== GNU_PROPERTY_X86_ISA_1_USED
6915 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6916 : _("error: %B: <corrupt x86 ISA needed size: 0x%x>")),
6918 return property_corrupt
;
6920 prop
= _bfd_elf_get_property (abfd
, type
, datasz
);
6921 prop
->u
.number
= bfd_h_get_32 (abfd
, ptr
);
6922 prop
->pr_kind
= property_number
;
6926 return property_ignored
;
6929 return property_number
;
6932 /* Merge x86-64 GNU property BPROP with APROP. If APROP isn't NULL,
6933 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6934 should be merged with ABFD. */
6937 elf_x86_64_merge_gnu_properties (bfd
*abfd ATTRIBUTE_UNUSED
,
6938 elf_property
*aprop
,
6939 elf_property
*bprop
)
6941 unsigned int number
;
6942 bfd_boolean updated
= FALSE
;
6943 unsigned int pr_type
= aprop
!= NULL
? aprop
->pr_type
: bprop
->pr_type
;
6947 case GNU_PROPERTY_X86_ISA_1_USED
:
6948 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
6949 if (aprop
!= NULL
&& bprop
!= NULL
)
6951 number
= aprop
->u
.number
;
6952 aprop
->u
.number
= number
| bprop
->u
.number
;
6953 updated
= number
!= (unsigned int) aprop
->u
.number
;
6957 /* Return TRUE if APROP is NULL to indicate that BPROP should
6958 be added to ABFD. */
6959 updated
= aprop
== NULL
;
6964 /* Never should happen. */
6971 static const struct bfd_elf_special_section
6972 elf_x86_64_special_sections
[]=
6974 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6975 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6976 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6977 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6978 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6979 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6980 { NULL
, 0, 0, 0, 0 }
6983 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6984 #define TARGET_LITTLE_NAME "elf64-x86-64"
6985 #define ELF_ARCH bfd_arch_i386
6986 #define ELF_TARGET_ID X86_64_ELF_DATA
6987 #define ELF_MACHINE_CODE EM_X86_64
6988 #define ELF_MAXPAGESIZE 0x200000
6989 #define ELF_MINPAGESIZE 0x1000
6990 #define ELF_COMMONPAGESIZE 0x1000
6992 #define elf_backend_can_gc_sections 1
6993 #define elf_backend_can_refcount 1
6994 #define elf_backend_want_got_plt 1
6995 #define elf_backend_plt_readonly 1
6996 #define elf_backend_want_plt_sym 0
6997 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6998 #define elf_backend_rela_normal 1
6999 #define elf_backend_plt_alignment 4
7000 #define elf_backend_extern_protected_data 1
7001 #define elf_backend_caches_rawsize 1
7002 #define elf_backend_dtrel_excludes_plt 1
7003 #define elf_backend_want_dynrelro 1
7005 #define elf_info_to_howto elf_x86_64_info_to_howto
7007 #define bfd_elf64_bfd_link_hash_table_create \
7008 elf_x86_64_link_hash_table_create
7009 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
7010 #define bfd_elf64_bfd_reloc_name_lookup \
7011 elf_x86_64_reloc_name_lookup
7013 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
7014 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
7015 #define elf_backend_check_relocs elf_x86_64_check_relocs
7016 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
7017 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
7018 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
7019 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
7020 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
7021 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
7022 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
7023 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
7025 #define elf_backend_write_core_note elf_x86_64_write_core_note
7027 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
7028 #define elf_backend_relocate_section elf_x86_64_relocate_section
7029 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
7030 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
7031 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
7032 #define elf_backend_object_p elf64_x86_64_elf_object_p
7033 #define bfd_elf64_mkobject elf_x86_64_mkobject
7034 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
7036 #define elf_backend_section_from_shdr \
7037 elf_x86_64_section_from_shdr
7039 #define elf_backend_section_from_bfd_section \
7040 elf_x86_64_elf_section_from_bfd_section
7041 #define elf_backend_add_symbol_hook \
7042 elf_x86_64_add_symbol_hook
7043 #define elf_backend_symbol_processing \
7044 elf_x86_64_symbol_processing
7045 #define elf_backend_common_section_index \
7046 elf_x86_64_common_section_index
7047 #define elf_backend_common_section \
7048 elf_x86_64_common_section
7049 #define elf_backend_common_definition \
7050 elf_x86_64_common_definition
7051 #define elf_backend_merge_symbol \
7052 elf_x86_64_merge_symbol
7053 #define elf_backend_special_sections \
7054 elf_x86_64_special_sections
7055 #define elf_backend_additional_program_headers \
7056 elf_x86_64_additional_program_headers
7057 #define elf_backend_hash_symbol \
7058 elf_x86_64_hash_symbol
7059 #define elf_backend_omit_section_dynsym \
7060 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
7061 #define elf_backend_fixup_symbol \
7062 elf_x86_64_fixup_symbol
7063 #define elf_backend_parse_gnu_properties \
7064 elf_x86_64_parse_gnu_properties
7065 #define elf_backend_merge_gnu_properties \
7066 elf_x86_64_merge_gnu_properties
7068 #include "elf64-target.h"
7070 /* CloudABI support. */
7072 #undef TARGET_LITTLE_SYM
7073 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
7074 #undef TARGET_LITTLE_NAME
7075 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
7078 #define ELF_OSABI ELFOSABI_CLOUDABI
7081 #define elf64_bed elf64_x86_64_cloudabi_bed
7083 #include "elf64-target.h"
7085 /* FreeBSD support. */
7087 #undef TARGET_LITTLE_SYM
7088 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
7089 #undef TARGET_LITTLE_NAME
7090 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
7093 #define ELF_OSABI ELFOSABI_FREEBSD
7096 #define elf64_bed elf64_x86_64_fbsd_bed
7098 #include "elf64-target.h"
7100 /* Solaris 2 support. */
7102 #undef TARGET_LITTLE_SYM
7103 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
7104 #undef TARGET_LITTLE_NAME
7105 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
7107 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
7108 objects won't be recognized. */
7112 #define elf64_bed elf64_x86_64_sol2_bed
7114 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
7116 #undef elf_backend_static_tls_alignment
7117 #define elf_backend_static_tls_alignment 16
7119 /* The Solaris 2 ABI requires a plt symbol on all platforms.
7121 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
7123 #undef elf_backend_want_plt_sym
7124 #define elf_backend_want_plt_sym 1
7126 #undef elf_backend_strtab_flags
7127 #define elf_backend_strtab_flags SHF_STRINGS
7130 elf64_x86_64_copy_solaris_special_section_fields (const bfd
*ibfd ATTRIBUTE_UNUSED
,
7131 bfd
*obfd ATTRIBUTE_UNUSED
,
7132 const Elf_Internal_Shdr
*isection ATTRIBUTE_UNUSED
,
7133 Elf_Internal_Shdr
*osection ATTRIBUTE_UNUSED
)
7135 /* PR 19938: FIXME: Need to add code for setting the sh_info
7136 and sh_link fields of Solaris specific section types. */
7140 #undef elf_backend_copy_special_section_fields
7141 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
7143 #include "elf64-target.h"
7145 /* Native Client support. */
7148 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
7150 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
7151 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
7155 #undef TARGET_LITTLE_SYM
7156 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
7157 #undef TARGET_LITTLE_NAME
7158 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
7160 #define elf64_bed elf64_x86_64_nacl_bed
7162 #undef ELF_MAXPAGESIZE
7163 #undef ELF_MINPAGESIZE
7164 #undef ELF_COMMONPAGESIZE
7165 #define ELF_MAXPAGESIZE 0x10000
7166 #define ELF_MINPAGESIZE 0x10000
7167 #define ELF_COMMONPAGESIZE 0x10000
7169 /* Restore defaults. */
7171 #undef elf_backend_static_tls_alignment
7172 #undef elf_backend_want_plt_sym
7173 #define elf_backend_want_plt_sym 0
7174 #undef elf_backend_strtab_flags
7175 #undef elf_backend_copy_special_section_fields
7177 /* NaCl uses substantially different PLT entries for the same effects. */
7179 #undef elf_backend_plt_alignment
7180 #define elf_backend_plt_alignment 5
7181 #define NACL_PLT_ENTRY_SIZE 64
7182 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
7184 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
7186 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
7187 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
7188 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
7189 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7190 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7192 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
7193 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
7195 /* 32 bytes of nop to pad out to the standard size. */
7196 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7197 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
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, /* excess data16 prefix */
7204 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
7206 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
7207 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
7208 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7209 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7211 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
7212 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7213 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7215 /* Lazy GOT entries point here (32-byte aligned). */
7216 0x68, /* pushq immediate */
7217 0, 0, 0, 0, /* replaced with index into relocation table. */
7218 0xe9, /* jmp relative */
7219 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
7221 /* 22 bytes of nop to pad out to the standard size. */
7222 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7223 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7224 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
7227 /* .eh_frame covering the .plt section. */
7229 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
7231 #if (PLT_CIE_LENGTH != 20 \
7232 || PLT_FDE_LENGTH != 36 \
7233 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7234 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7235 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
7237 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
7238 0, 0, 0, 0, /* CIE ID */
7239 1, /* CIE version */
7240 'z', 'R', 0, /* Augmentation string */
7241 1, /* Code alignment factor */
7242 0x78, /* Data alignment factor */
7243 16, /* Return address column */
7244 1, /* Augmentation size */
7245 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
7246 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
7247 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
7248 DW_CFA_nop
, DW_CFA_nop
,
7250 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
7251 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
7252 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
7253 0, 0, 0, 0, /* .plt size goes here */
7254 0, /* Augmentation size */
7255 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
7256 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7257 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
7258 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7259 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
7260 13, /* Block length */
7261 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
7262 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
7263 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
7264 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
7265 DW_CFA_nop
, DW_CFA_nop
7268 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
7270 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
7271 elf_x86_64_nacl_plt_entry
, /* plt_entry */
7272 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
7273 2, /* plt0_got1_offset */
7274 9, /* plt0_got2_offset */
7275 13, /* plt0_got2_insn_end */
7276 3, /* plt_got_offset */
7277 33, /* plt_reloc_offset */
7278 38, /* plt_plt_offset */
7279 7, /* plt_got_insn_size */
7280 42, /* plt_plt_insn_end */
7281 32, /* plt_lazy_offset */
7282 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
7283 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
7284 NULL
, /* eh_frame_plt_got */
7285 0, /* eh_frame_plt_got_size */
7288 #undef elf_backend_arch_data
7289 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
7291 #undef elf_backend_object_p
7292 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
7293 #undef elf_backend_modify_segment_map
7294 #define elf_backend_modify_segment_map nacl_modify_segment_map
7295 #undef elf_backend_modify_program_headers
7296 #define elf_backend_modify_program_headers nacl_modify_program_headers
7297 #undef elf_backend_final_write_processing
7298 #define elf_backend_final_write_processing nacl_final_write_processing
7300 #include "elf64-target.h"
7302 /* Native Client x32 support. */
7305 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
7307 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
7308 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
7312 #undef TARGET_LITTLE_SYM
7313 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
7314 #undef TARGET_LITTLE_NAME
7315 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
7317 #define elf32_bed elf32_x86_64_nacl_bed
7319 #define bfd_elf32_bfd_link_hash_table_create \
7320 elf_x86_64_link_hash_table_create
7321 #define bfd_elf32_bfd_reloc_type_lookup \
7322 elf_x86_64_reloc_type_lookup
7323 #define bfd_elf32_bfd_reloc_name_lookup \
7324 elf_x86_64_reloc_name_lookup
7325 #define bfd_elf32_mkobject \
7327 #define bfd_elf32_get_synthetic_symtab \
7328 elf_x86_64_get_synthetic_symtab
7330 #undef elf_backend_object_p
7331 #define elf_backend_object_p \
7332 elf32_x86_64_nacl_elf_object_p
7334 #undef elf_backend_bfd_from_remote_memory
7335 #define elf_backend_bfd_from_remote_memory \
7336 _bfd_elf32_bfd_from_remote_memory
7338 #undef elf_backend_size_info
7339 #define elf_backend_size_info \
7340 _bfd_elf32_size_info
7342 #include "elf32-target.h"
7344 /* Restore defaults. */
7345 #undef elf_backend_object_p
7346 #define elf_backend_object_p elf64_x86_64_elf_object_p
7347 #undef elf_backend_bfd_from_remote_memory
7348 #undef elf_backend_size_info
7349 #undef elf_backend_modify_segment_map
7350 #undef elf_backend_modify_program_headers
7351 #undef elf_backend_final_write_processing
7353 /* Intel L1OM support. */
7356 elf64_l1om_elf_object_p (bfd
*abfd
)
7358 /* Set the right machine number for an L1OM elf64 file. */
7359 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
7363 #undef TARGET_LITTLE_SYM
7364 #define TARGET_LITTLE_SYM l1om_elf64_vec
7365 #undef TARGET_LITTLE_NAME
7366 #define TARGET_LITTLE_NAME "elf64-l1om"
7368 #define ELF_ARCH bfd_arch_l1om
7370 #undef ELF_MACHINE_CODE
7371 #define ELF_MACHINE_CODE EM_L1OM
7376 #define elf64_bed elf64_l1om_bed
7378 #undef elf_backend_object_p
7379 #define elf_backend_object_p elf64_l1om_elf_object_p
7381 /* Restore defaults. */
7382 #undef ELF_MAXPAGESIZE
7383 #undef ELF_MINPAGESIZE
7384 #undef ELF_COMMONPAGESIZE
7385 #define ELF_MAXPAGESIZE 0x200000
7386 #define ELF_MINPAGESIZE 0x1000
7387 #define ELF_COMMONPAGESIZE 0x1000
7388 #undef elf_backend_plt_alignment
7389 #define elf_backend_plt_alignment 4
7390 #undef elf_backend_arch_data
7391 #define elf_backend_arch_data &elf_x86_64_arch_bed
7393 #include "elf64-target.h"
7395 /* FreeBSD L1OM support. */
7397 #undef TARGET_LITTLE_SYM
7398 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
7399 #undef TARGET_LITTLE_NAME
7400 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
7403 #define ELF_OSABI ELFOSABI_FREEBSD
7406 #define elf64_bed elf64_l1om_fbsd_bed
7408 #include "elf64-target.h"
7410 /* Intel K1OM support. */
7413 elf64_k1om_elf_object_p (bfd
*abfd
)
7415 /* Set the right machine number for an K1OM elf64 file. */
7416 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
7420 #undef TARGET_LITTLE_SYM
7421 #define TARGET_LITTLE_SYM k1om_elf64_vec
7422 #undef TARGET_LITTLE_NAME
7423 #define TARGET_LITTLE_NAME "elf64-k1om"
7425 #define ELF_ARCH bfd_arch_k1om
7427 #undef ELF_MACHINE_CODE
7428 #define ELF_MACHINE_CODE EM_K1OM
7433 #define elf64_bed elf64_k1om_bed
7435 #undef elf_backend_object_p
7436 #define elf_backend_object_p elf64_k1om_elf_object_p
7438 #undef elf_backend_static_tls_alignment
7440 #undef elf_backend_want_plt_sym
7441 #define elf_backend_want_plt_sym 0
7443 #include "elf64-target.h"
7445 /* FreeBSD K1OM support. */
7447 #undef TARGET_LITTLE_SYM
7448 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
7449 #undef TARGET_LITTLE_NAME
7450 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
7453 #define ELF_OSABI ELFOSABI_FREEBSD
7456 #define elf64_bed elf64_k1om_fbsd_bed
7458 #include "elf64-target.h"
7460 /* 32bit x86-64 support. */
7462 #undef TARGET_LITTLE_SYM
7463 #define TARGET_LITTLE_SYM x86_64_elf32_vec
7464 #undef TARGET_LITTLE_NAME
7465 #define TARGET_LITTLE_NAME "elf32-x86-64"
7469 #define ELF_ARCH bfd_arch_i386
7471 #undef ELF_MACHINE_CODE
7472 #define ELF_MACHINE_CODE EM_X86_64
7476 #undef elf_backend_object_p
7477 #define elf_backend_object_p \
7478 elf32_x86_64_elf_object_p
7480 #undef elf_backend_bfd_from_remote_memory
7481 #define elf_backend_bfd_from_remote_memory \
7482 _bfd_elf32_bfd_from_remote_memory
7484 #undef elf_backend_size_info
7485 #define elf_backend_size_info \
7486 _bfd_elf32_size_info
7488 #include "elf32-target.h"