1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2016 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 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
290 r_type
= R_X86_64_NONE
;
295 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
296 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
297 return &x86_64_elf_howto_table
[i
];
300 /* Given a BFD reloc type, return a HOWTO structure. */
301 static reloc_howto_type
*
302 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
303 bfd_reloc_code_real_type code
)
307 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
310 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
311 return elf_x86_64_rtype_to_howto (abfd
,
312 x86_64_reloc_map
[i
].elf_reloc_val
);
317 static reloc_howto_type
*
318 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
323 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
325 /* Get x32 R_X86_64_32. */
326 reloc_howto_type
*reloc
327 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
328 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
332 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
333 if (x86_64_elf_howto_table
[i
].name
!= NULL
334 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
335 return &x86_64_elf_howto_table
[i
];
340 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
343 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
344 Elf_Internal_Rela
*dst
)
348 r_type
= ELF32_R_TYPE (dst
->r_info
);
349 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
350 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
353 /* Support for core dump NOTE sections. */
355 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
360 switch (note
->descsz
)
365 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
367 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
370 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
378 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
380 elf_tdata (abfd
)->core
->signal
381 = bfd_get_16 (abfd
, note
->descdata
+ 12);
384 elf_tdata (abfd
)->core
->lwpid
385 = bfd_get_32 (abfd
, note
->descdata
+ 32);
394 /* Make a ".reg/999" section. */
395 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
396 size
, note
->descpos
+ offset
);
400 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
402 switch (note
->descsz
)
407 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
408 elf_tdata (abfd
)->core
->pid
409 = bfd_get_32 (abfd
, note
->descdata
+ 12);
410 elf_tdata (abfd
)->core
->program
411 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
412 elf_tdata (abfd
)->core
->command
413 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
416 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
417 elf_tdata (abfd
)->core
->pid
418 = bfd_get_32 (abfd
, note
->descdata
+ 24);
419 elf_tdata (abfd
)->core
->program
420 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
421 elf_tdata (abfd
)->core
->command
422 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
425 /* Note that for some reason, a spurious space is tacked
426 onto the end of the args in some (at least one anyway)
427 implementations, so strip it off if it exists. */
430 char *command
= elf_tdata (abfd
)->core
->command
;
431 int n
= strlen (command
);
433 if (0 < n
&& command
[n
- 1] == ' ')
434 command
[n
- 1] = '\0';
442 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
445 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
447 const char *fname
, *psargs
;
458 va_start (ap
, note_type
);
459 fname
= va_arg (ap
, const char *);
460 psargs
= va_arg (ap
, const char *);
463 if (bed
->s
->elfclass
== ELFCLASS32
)
466 memset (&data
, 0, sizeof (data
));
467 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
468 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
469 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
470 &data
, sizeof (data
));
475 memset (&data
, 0, sizeof (data
));
476 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
477 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
478 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
479 &data
, sizeof (data
));
484 va_start (ap
, note_type
);
485 pid
= va_arg (ap
, long);
486 cursig
= va_arg (ap
, int);
487 gregs
= va_arg (ap
, const void *);
490 if (bed
->s
->elfclass
== ELFCLASS32
)
492 if (bed
->elf_machine_code
== EM_X86_64
)
494 prstatusx32_t prstat
;
495 memset (&prstat
, 0, sizeof (prstat
));
497 prstat
.pr_cursig
= cursig
;
498 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
499 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
500 &prstat
, sizeof (prstat
));
505 memset (&prstat
, 0, sizeof (prstat
));
507 prstat
.pr_cursig
= cursig
;
508 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
509 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
510 &prstat
, sizeof (prstat
));
516 memset (&prstat
, 0, sizeof (prstat
));
518 prstat
.pr_cursig
= cursig
;
519 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
520 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
521 &prstat
, sizeof (prstat
));
528 /* Functions for the x86-64 ELF linker. */
530 /* The name of the dynamic interpreter. This is put in the .interp
533 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
534 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
536 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
537 copying dynamic variables from a shared lib into an app's dynbss
538 section, and instead use a dynamic relocation to point into the
540 #define ELIMINATE_COPY_RELOCS 1
542 /* The size in bytes of an entry in the global offset table. */
544 #define GOT_ENTRY_SIZE 8
546 /* The size in bytes of an entry in the procedure linkage table. */
548 #define PLT_ENTRY_SIZE 16
550 /* The first entry in a procedure linkage table looks like this. See the
551 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
553 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
555 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
556 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
557 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
560 /* Subsequent entries in a procedure linkage table look like this. */
562 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
564 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
565 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
566 0x68, /* pushq immediate */
567 0, 0, 0, 0, /* replaced with index into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
572 /* The first entry in a procedure linkage table with BND relocations
575 static const bfd_byte elf_x86_64_bnd_plt0_entry
[PLT_ENTRY_SIZE
] =
577 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
578 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
579 0x0f, 0x1f, 0 /* nopl (%rax) */
582 /* Subsequent entries for legacy branches in a procedure linkage table
583 with BND relocations look like this. */
585 static const bfd_byte elf_x86_64_legacy_plt_entry
[PLT_ENTRY_SIZE
] =
587 0x68, 0, 0, 0, 0, /* pushq immediate */
588 0xe9, 0, 0, 0, 0, /* jmpq relative */
589 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
592 /* Subsequent entries for branches with BND prefx in a procedure linkage
593 table with BND relocations look like this. */
595 static const bfd_byte elf_x86_64_bnd_plt_entry
[PLT_ENTRY_SIZE
] =
597 0x68, 0, 0, 0, 0, /* pushq immediate */
598 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
599 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
602 /* Entries for legacy branches in the second procedure linkage table
605 static const bfd_byte elf_x86_64_legacy_plt2_entry
[8] =
607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
612 /* Entries for branches with BND prefix in the second procedure linkage
613 table look like this. */
615 static const bfd_byte elf_x86_64_bnd_plt2_entry
[8] =
617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
622 /* .eh_frame covering the .plt section. */
624 static const bfd_byte elf_x86_64_eh_frame_plt
[] =
626 #define PLT_CIE_LENGTH 20
627 #define PLT_FDE_LENGTH 36
628 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
629 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
630 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
631 0, 0, 0, 0, /* CIE ID */
633 'z', 'R', 0, /* Augmentation string */
634 1, /* Code alignment factor */
635 0x78, /* Data alignment factor */
636 16, /* Return address column */
637 1, /* Augmentation size */
638 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
639 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
640 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
641 DW_CFA_nop
, DW_CFA_nop
,
643 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
644 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
645 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
646 0, 0, 0, 0, /* .plt size goes here */
647 0, /* Augmentation size */
648 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
649 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
650 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
651 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
652 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
653 11, /* Block length */
654 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
655 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
656 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
657 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
658 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
661 /* Architecture-specific backend data for x86-64. */
663 struct elf_x86_64_backend_data
665 /* Templates for the initial PLT entry and for subsequent entries. */
666 const bfd_byte
*plt0_entry
;
667 const bfd_byte
*plt_entry
;
668 unsigned int plt_entry_size
; /* Size of each PLT entry. */
670 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
671 unsigned int plt0_got1_offset
;
672 unsigned int plt0_got2_offset
;
674 /* Offset of the end of the PC-relative instruction containing
676 unsigned int plt0_got2_insn_end
;
678 /* Offsets into plt_entry that are to be replaced with... */
679 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
680 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
681 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
683 /* Length of the PC-relative instruction containing plt_got_offset. */
684 unsigned int plt_got_insn_size
;
686 /* Offset of the end of the PC-relative jump to plt0_entry. */
687 unsigned int plt_plt_insn_end
;
689 /* Offset into plt_entry where the initial value of the GOT entry points. */
690 unsigned int plt_lazy_offset
;
692 /* .eh_frame covering the .plt section. */
693 const bfd_byte
*eh_frame_plt
;
694 unsigned int eh_frame_plt_size
;
697 #define get_elf_x86_64_arch_data(bed) \
698 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
700 #define get_elf_x86_64_backend_data(abfd) \
701 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
703 #define GET_PLT_ENTRY_SIZE(abfd) \
704 get_elf_x86_64_backend_data (abfd)->plt_entry_size
706 /* These are the standard parameters. */
707 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed
=
709 elf_x86_64_plt0_entry
, /* plt0_entry */
710 elf_x86_64_plt_entry
, /* plt_entry */
711 sizeof (elf_x86_64_plt_entry
), /* plt_entry_size */
712 2, /* plt0_got1_offset */
713 8, /* plt0_got2_offset */
714 12, /* plt0_got2_insn_end */
715 2, /* plt_got_offset */
716 7, /* plt_reloc_offset */
717 12, /* plt_plt_offset */
718 6, /* plt_got_insn_size */
719 PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
720 6, /* plt_lazy_offset */
721 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
722 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
725 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed
=
727 elf_x86_64_bnd_plt0_entry
, /* plt0_entry */
728 elf_x86_64_bnd_plt_entry
, /* plt_entry */
729 sizeof (elf_x86_64_bnd_plt_entry
), /* plt_entry_size */
730 2, /* plt0_got1_offset */
731 1+8, /* plt0_got2_offset */
732 1+12, /* plt0_got2_insn_end */
733 1+2, /* plt_got_offset */
734 1, /* plt_reloc_offset */
735 7, /* plt_plt_offset */
736 1+6, /* plt_got_insn_size */
737 11, /* plt_plt_insn_end */
738 0, /* plt_lazy_offset */
739 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
740 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
743 #define elf_backend_arch_data &elf_x86_64_arch_bed
745 /* x86-64 ELF linker hash entry. */
747 struct elf_x86_64_link_hash_entry
749 struct elf_link_hash_entry elf
;
751 /* Track dynamic relocs copied for this symbol. */
752 struct elf_dyn_relocs
*dyn_relocs
;
754 #define GOT_UNKNOWN 0
758 #define GOT_TLS_GDESC 4
759 #define GOT_TLS_GD_BOTH_P(type) \
760 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
761 #define GOT_TLS_GD_P(type) \
762 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
763 #define GOT_TLS_GDESC_P(type) \
764 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
765 #define GOT_TLS_GD_ANY_P(type) \
766 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
767 unsigned char tls_type
;
769 /* TRUE if a weak symbol with a real definition needs a copy reloc.
770 When there is a weak symbol with a real definition, the processor
771 independent code will have arranged for us to see the real
772 definition first. We need to copy the needs_copy bit from the
773 real definition and check it when allowing copy reloc in PIE. */
774 unsigned int needs_copy
: 1;
776 /* TRUE if symbol has at least one BND relocation. */
777 unsigned int has_bnd_reloc
: 1;
779 /* Reference count of C/C++ function pointer relocations in read-write
780 section which can be resolved at run-time. */
781 bfd_signed_vma func_pointer_refcount
;
783 /* Information about the GOT PLT entry. Filled when there are both
784 GOT and PLT relocations against the same function. */
785 union gotplt_union plt_got
;
787 /* Information about the second PLT entry. Filled when has_bnd_reloc is
789 union gotplt_union plt_bnd
;
791 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
792 starting at the end of the jump table. */
796 #define elf_x86_64_hash_entry(ent) \
797 ((struct elf_x86_64_link_hash_entry *)(ent))
799 struct elf_x86_64_obj_tdata
801 struct elf_obj_tdata root
;
803 /* tls_type for each local got entry. */
804 char *local_got_tls_type
;
806 /* GOTPLT entries for TLS descriptors. */
807 bfd_vma
*local_tlsdesc_gotent
;
810 #define elf_x86_64_tdata(abfd) \
811 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
813 #define elf_x86_64_local_got_tls_type(abfd) \
814 (elf_x86_64_tdata (abfd)->local_got_tls_type)
816 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
817 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
819 #define is_x86_64_elf(bfd) \
820 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
821 && elf_tdata (bfd) != NULL \
822 && elf_object_id (bfd) == X86_64_ELF_DATA)
825 elf_x86_64_mkobject (bfd
*abfd
)
827 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
831 /* x86-64 ELF linker hash table. */
833 struct elf_x86_64_link_hash_table
835 struct elf_link_hash_table elf
;
837 /* Short-cuts to get to dynamic linker sections. */
840 asection
*plt_eh_frame
;
846 bfd_signed_vma refcount
;
850 /* The amount of space used by the jump slots in the GOT. */
851 bfd_vma sgotplt_jump_table_size
;
853 /* Small local sym cache. */
854 struct sym_cache sym_cache
;
856 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
857 bfd_vma (*r_sym
) (bfd_vma
);
858 unsigned int pointer_r_type
;
859 const char *dynamic_interpreter
;
860 int dynamic_interpreter_size
;
862 /* _TLS_MODULE_BASE_ symbol. */
863 struct bfd_link_hash_entry
*tls_module_base
;
865 /* Used by local STT_GNU_IFUNC symbols. */
866 htab_t loc_hash_table
;
867 void * loc_hash_memory
;
869 /* The offset into splt of the PLT entry for the TLS descriptor
870 resolver. Special values are 0, if not necessary (or not found
871 to be necessary yet), and -1 if needed but not determined
874 /* The offset into sgot of the GOT entry used by the PLT entry
878 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
879 bfd_vma next_jump_slot_index
;
880 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
881 bfd_vma next_irelative_index
;
884 /* Get the x86-64 ELF linker hash table from a link_info structure. */
886 #define elf_x86_64_hash_table(p) \
887 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
888 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
890 #define elf_x86_64_compute_jump_table_size(htab) \
891 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
893 /* Create an entry in an x86-64 ELF linker hash table. */
895 static struct bfd_hash_entry
*
896 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
897 struct bfd_hash_table
*table
,
900 /* Allocate the structure if it has not already been allocated by a
904 entry
= (struct bfd_hash_entry
*)
905 bfd_hash_allocate (table
,
906 sizeof (struct elf_x86_64_link_hash_entry
));
911 /* Call the allocation method of the superclass. */
912 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
915 struct elf_x86_64_link_hash_entry
*eh
;
917 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
918 eh
->dyn_relocs
= NULL
;
919 eh
->tls_type
= GOT_UNKNOWN
;
921 eh
->has_bnd_reloc
= 0;
922 eh
->func_pointer_refcount
= 0;
923 eh
->plt_bnd
.offset
= (bfd_vma
) -1;
924 eh
->plt_got
.offset
= (bfd_vma
) -1;
925 eh
->tlsdesc_got
= (bfd_vma
) -1;
931 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
932 for local symbol so that we can handle local STT_GNU_IFUNC symbols
933 as global symbol. We reuse indx and dynstr_index for local symbol
934 hash since they aren't used by global symbols in this backend. */
937 elf_x86_64_local_htab_hash (const void *ptr
)
939 struct elf_link_hash_entry
*h
940 = (struct elf_link_hash_entry
*) ptr
;
941 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
944 /* Compare local hash entries. */
947 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
949 struct elf_link_hash_entry
*h1
950 = (struct elf_link_hash_entry
*) ptr1
;
951 struct elf_link_hash_entry
*h2
952 = (struct elf_link_hash_entry
*) ptr2
;
954 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
957 /* Find and/or create a hash entry for local symbol. */
959 static struct elf_link_hash_entry
*
960 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
961 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
964 struct elf_x86_64_link_hash_entry e
, *ret
;
965 asection
*sec
= abfd
->sections
;
966 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
967 htab
->r_sym (rel
->r_info
));
970 e
.elf
.indx
= sec
->id
;
971 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
972 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
973 create
? INSERT
: NO_INSERT
);
980 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
984 ret
= (struct elf_x86_64_link_hash_entry
*)
985 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
986 sizeof (struct elf_x86_64_link_hash_entry
));
989 memset (ret
, 0, sizeof (*ret
));
990 ret
->elf
.indx
= sec
->id
;
991 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
992 ret
->elf
.dynindx
= -1;
993 ret
->func_pointer_refcount
= 0;
994 ret
->plt_got
.offset
= (bfd_vma
) -1;
1000 /* Destroy an X86-64 ELF linker hash table. */
1003 elf_x86_64_link_hash_table_free (bfd
*obfd
)
1005 struct elf_x86_64_link_hash_table
*htab
1006 = (struct elf_x86_64_link_hash_table
*) obfd
->link
.hash
;
1008 if (htab
->loc_hash_table
)
1009 htab_delete (htab
->loc_hash_table
);
1010 if (htab
->loc_hash_memory
)
1011 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
1012 _bfd_elf_link_hash_table_free (obfd
);
1015 /* Create an X86-64 ELF linker hash table. */
1017 static struct bfd_link_hash_table
*
1018 elf_x86_64_link_hash_table_create (bfd
*abfd
)
1020 struct elf_x86_64_link_hash_table
*ret
;
1021 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
1023 ret
= (struct elf_x86_64_link_hash_table
*) bfd_zmalloc (amt
);
1027 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1028 elf_x86_64_link_hash_newfunc
,
1029 sizeof (struct elf_x86_64_link_hash_entry
),
1036 if (ABI_64_P (abfd
))
1038 ret
->r_info
= elf64_r_info
;
1039 ret
->r_sym
= elf64_r_sym
;
1040 ret
->pointer_r_type
= R_X86_64_64
;
1041 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
1042 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
1046 ret
->r_info
= elf32_r_info
;
1047 ret
->r_sym
= elf32_r_sym
;
1048 ret
->pointer_r_type
= R_X86_64_32
;
1049 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
1050 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
1053 ret
->loc_hash_table
= htab_try_create (1024,
1054 elf_x86_64_local_htab_hash
,
1055 elf_x86_64_local_htab_eq
,
1057 ret
->loc_hash_memory
= objalloc_create ();
1058 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1060 elf_x86_64_link_hash_table_free (abfd
);
1063 ret
->elf
.root
.hash_table_free
= elf_x86_64_link_hash_table_free
;
1065 return &ret
->elf
.root
;
1068 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1069 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1073 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
1074 struct bfd_link_info
*info
)
1076 struct elf_x86_64_link_hash_table
*htab
;
1078 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1081 htab
= elf_x86_64_hash_table (info
);
1085 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
1089 if (bfd_link_executable (info
))
1091 /* Always allow copy relocs for building executables. */
1092 asection
*s
= bfd_get_linker_section (dynobj
, ".rela.bss");
1095 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
1096 s
= bfd_make_section_anyway_with_flags (dynobj
,
1098 (bed
->dynamic_sec_flags
1101 || ! bfd_set_section_alignment (dynobj
, s
,
1102 bed
->s
->log_file_align
))
1108 if (!info
->no_ld_generated_unwind_info
1109 && htab
->plt_eh_frame
== NULL
1110 && htab
->elf
.splt
!= NULL
)
1112 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1113 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1114 | SEC_LINKER_CREATED
);
1116 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1117 if (htab
->plt_eh_frame
== NULL
1118 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
1124 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1127 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1128 struct elf_link_hash_entry
*dir
,
1129 struct elf_link_hash_entry
*ind
)
1131 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1133 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1134 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1136 if (!edir
->has_bnd_reloc
)
1137 edir
->has_bnd_reloc
= eind
->has_bnd_reloc
;
1139 if (eind
->dyn_relocs
!= NULL
)
1141 if (edir
->dyn_relocs
!= NULL
)
1143 struct elf_dyn_relocs
**pp
;
1144 struct elf_dyn_relocs
*p
;
1146 /* Add reloc counts against the indirect sym to the direct sym
1147 list. Merge any entries against the same section. */
1148 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1150 struct elf_dyn_relocs
*q
;
1152 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1153 if (q
->sec
== p
->sec
)
1155 q
->pc_count
+= p
->pc_count
;
1156 q
->count
+= p
->count
;
1163 *pp
= edir
->dyn_relocs
;
1166 edir
->dyn_relocs
= eind
->dyn_relocs
;
1167 eind
->dyn_relocs
= NULL
;
1170 if (ind
->root
.type
== bfd_link_hash_indirect
1171 && dir
->got
.refcount
<= 0)
1173 edir
->tls_type
= eind
->tls_type
;
1174 eind
->tls_type
= GOT_UNKNOWN
;
1177 if (ELIMINATE_COPY_RELOCS
1178 && ind
->root
.type
!= bfd_link_hash_indirect
1179 && dir
->dynamic_adjusted
)
1181 /* If called to transfer flags for a weakdef during processing
1182 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1183 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1184 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1185 dir
->ref_regular
|= ind
->ref_regular
;
1186 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1187 dir
->needs_plt
|= ind
->needs_plt
;
1188 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1192 if (eind
->func_pointer_refcount
> 0)
1194 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1195 eind
->func_pointer_refcount
= 0;
1198 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1203 elf64_x86_64_elf_object_p (bfd
*abfd
)
1205 /* Set the right machine number for an x86-64 elf64 file. */
1206 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1211 elf32_x86_64_elf_object_p (bfd
*abfd
)
1213 /* Set the right machine number for an x86-64 elf32 file. */
1214 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1218 /* Return TRUE if the TLS access code sequence support transition
1222 elf_x86_64_check_tls_transition (bfd
*abfd
,
1223 struct bfd_link_info
*info
,
1226 Elf_Internal_Shdr
*symtab_hdr
,
1227 struct elf_link_hash_entry
**sym_hashes
,
1228 unsigned int r_type
,
1229 const Elf_Internal_Rela
*rel
,
1230 const Elf_Internal_Rela
*relend
)
1233 unsigned long r_symndx
;
1234 bfd_boolean largepic
= FALSE
;
1235 struct elf_link_hash_entry
*h
;
1237 struct elf_x86_64_link_hash_table
*htab
;
1239 /* Get the section contents. */
1240 if (contents
== NULL
)
1242 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1243 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1246 /* FIXME: How to better handle error condition? */
1247 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1250 /* Cache the section contents for elf_link_input_bfd. */
1251 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1255 htab
= elf_x86_64_hash_table (info
);
1256 offset
= rel
->r_offset
;
1259 case R_X86_64_TLSGD
:
1260 case R_X86_64_TLSLD
:
1261 if ((rel
+ 1) >= relend
)
1264 if (r_type
== R_X86_64_TLSGD
)
1266 /* Check transition from GD access model. For 64bit, only
1267 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1268 .word 0x6666; rex64; call __tls_get_addr
1269 can transit to different access model. For 32bit, only
1270 leaq foo@tlsgd(%rip), %rdi
1271 .word 0x6666; rex64; call __tls_get_addr
1272 can transit to different access model. For largepic
1274 leaq foo@tlsgd(%rip), %rdi
1275 movabsq $__tls_get_addr@pltoff, %rax
1279 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1280 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1282 if ((offset
+ 12) > sec
->size
)
1285 if (memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1287 if (!ABI_64_P (abfd
)
1288 || (offset
+ 19) > sec
->size
1290 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0
1291 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1292 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1297 else if (ABI_64_P (abfd
))
1300 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1306 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1312 /* Check transition from LD access model. Only
1313 leaq foo@tlsld(%rip), %rdi;
1315 can transit to different access model. For largepic
1317 leaq foo@tlsld(%rip), %rdi
1318 movabsq $__tls_get_addr@pltoff, %rax
1322 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1324 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1327 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1330 if (0xe8 != *(contents
+ offset
+ 4))
1332 if (!ABI_64_P (abfd
)
1333 || (offset
+ 19) > sec
->size
1334 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1335 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1342 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1343 if (r_symndx
< symtab_hdr
->sh_info
)
1346 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1347 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1348 may be versioned. */
1350 && h
->root
.root
.string
!= NULL
1352 ? ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
1353 : (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1354 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
))
1355 && (strncmp (h
->root
.root
.string
,
1356 "__tls_get_addr", 14) == 0));
1358 case R_X86_64_GOTTPOFF
:
1359 /* Check transition from IE access model:
1360 mov foo@gottpoff(%rip), %reg
1361 add foo@gottpoff(%rip), %reg
1364 /* Check REX prefix first. */
1365 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1367 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1368 if (val
!= 0x48 && val
!= 0x4c)
1370 /* X32 may have 0x44 REX prefix or no REX prefix. */
1371 if (ABI_64_P (abfd
))
1377 /* X32 may not have any REX prefix. */
1378 if (ABI_64_P (abfd
))
1380 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1384 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1385 if (val
!= 0x8b && val
!= 0x03)
1388 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1389 return (val
& 0xc7) == 5;
1391 case R_X86_64_GOTPC32_TLSDESC
:
1392 /* Check transition from GDesc access model:
1393 leaq x@tlsdesc(%rip), %rax
1395 Make sure it's a leaq adding rip to a 32-bit offset
1396 into any register, although it's probably almost always
1399 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1402 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1403 if ((val
& 0xfb) != 0x48)
1406 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1409 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1410 return (val
& 0xc7) == 0x05;
1412 case R_X86_64_TLSDESC_CALL
:
1413 /* Check transition from GDesc access model:
1414 call *x@tlsdesc(%rax)
1416 if (offset
+ 2 <= sec
->size
)
1418 /* Make sure that it's a call *x@tlsdesc(%rax). */
1419 static const unsigned char call
[] = { 0xff, 0x10 };
1420 return memcmp (contents
+ offset
, call
, 2) == 0;
1430 /* Return TRUE if the TLS access transition is OK or no transition
1431 will be performed. Update R_TYPE if there is a transition. */
1434 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1435 asection
*sec
, bfd_byte
*contents
,
1436 Elf_Internal_Shdr
*symtab_hdr
,
1437 struct elf_link_hash_entry
**sym_hashes
,
1438 unsigned int *r_type
, int tls_type
,
1439 const Elf_Internal_Rela
*rel
,
1440 const Elf_Internal_Rela
*relend
,
1441 struct elf_link_hash_entry
*h
,
1442 unsigned long r_symndx
)
1444 unsigned int from_type
= *r_type
;
1445 unsigned int to_type
= from_type
;
1446 bfd_boolean check
= TRUE
;
1448 /* Skip TLS transition for functions. */
1450 && (h
->type
== STT_FUNC
1451 || h
->type
== STT_GNU_IFUNC
))
1456 case R_X86_64_TLSGD
:
1457 case R_X86_64_GOTPC32_TLSDESC
:
1458 case R_X86_64_TLSDESC_CALL
:
1459 case R_X86_64_GOTTPOFF
:
1460 if (bfd_link_executable (info
))
1463 to_type
= R_X86_64_TPOFF32
;
1465 to_type
= R_X86_64_GOTTPOFF
;
1468 /* When we are called from elf_x86_64_relocate_section,
1469 CONTENTS isn't NULL and there may be additional transitions
1470 based on TLS_TYPE. */
1471 if (contents
!= NULL
)
1473 unsigned int new_to_type
= to_type
;
1475 if (bfd_link_executable (info
)
1478 && tls_type
== GOT_TLS_IE
)
1479 new_to_type
= R_X86_64_TPOFF32
;
1481 if (to_type
== R_X86_64_TLSGD
1482 || to_type
== R_X86_64_GOTPC32_TLSDESC
1483 || to_type
== R_X86_64_TLSDESC_CALL
)
1485 if (tls_type
== GOT_TLS_IE
)
1486 new_to_type
= R_X86_64_GOTTPOFF
;
1489 /* We checked the transition before when we were called from
1490 elf_x86_64_check_relocs. We only want to check the new
1491 transition which hasn't been checked before. */
1492 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1493 to_type
= new_to_type
;
1498 case R_X86_64_TLSLD
:
1499 if (bfd_link_executable (info
))
1500 to_type
= R_X86_64_TPOFF32
;
1507 /* Return TRUE if there is no transition. */
1508 if (from_type
== to_type
)
1511 /* Check if the transition can be performed. */
1513 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1514 symtab_hdr
, sym_hashes
,
1515 from_type
, rel
, relend
))
1517 reloc_howto_type
*from
, *to
;
1520 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1521 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1524 name
= h
->root
.root
.string
;
1527 struct elf_x86_64_link_hash_table
*htab
;
1529 htab
= elf_x86_64_hash_table (info
);
1534 Elf_Internal_Sym
*isym
;
1536 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1538 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1542 (*_bfd_error_handler
)
1543 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1544 "in section `%A' failed"),
1545 abfd
, sec
, from
->name
, to
->name
, name
,
1546 (unsigned long) rel
->r_offset
);
1547 bfd_set_error (bfd_error_bad_value
);
1555 /* Rename some of the generic section flags to better document how they
1557 #define need_convert_load sec_flg0
1559 /* Look through the relocs for a section during the first phase, and
1560 calculate needed space in the global offset table, procedure
1561 linkage table, and dynamic reloc sections. */
1564 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1566 const Elf_Internal_Rela
*relocs
)
1568 struct elf_x86_64_link_hash_table
*htab
;
1569 Elf_Internal_Shdr
*symtab_hdr
;
1570 struct elf_link_hash_entry
**sym_hashes
;
1571 const Elf_Internal_Rela
*rel
;
1572 const Elf_Internal_Rela
*rel_end
;
1574 bfd_boolean use_plt_got
;
1576 if (bfd_link_relocatable (info
))
1579 BFD_ASSERT (is_x86_64_elf (abfd
));
1581 htab
= elf_x86_64_hash_table (info
);
1585 use_plt_got
= get_elf_x86_64_backend_data (abfd
) == &elf_x86_64_arch_bed
;
1587 symtab_hdr
= &elf_symtab_hdr (abfd
);
1588 sym_hashes
= elf_sym_hashes (abfd
);
1592 rel_end
= relocs
+ sec
->reloc_count
;
1593 for (rel
= relocs
; rel
< rel_end
; rel
++)
1595 unsigned int r_type
;
1596 unsigned long r_symndx
;
1597 struct elf_link_hash_entry
*h
;
1598 Elf_Internal_Sym
*isym
;
1600 bfd_boolean size_reloc
;
1602 r_symndx
= htab
->r_sym (rel
->r_info
);
1603 r_type
= ELF32_R_TYPE (rel
->r_info
);
1605 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1607 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1612 if (r_symndx
< symtab_hdr
->sh_info
)
1614 /* A local symbol. */
1615 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1620 /* Check relocation against local STT_GNU_IFUNC symbol. */
1621 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1623 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1628 /* Fake a STT_GNU_IFUNC symbol. */
1629 h
->type
= STT_GNU_IFUNC
;
1632 h
->forced_local
= 1;
1633 h
->root
.type
= bfd_link_hash_defined
;
1641 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1642 while (h
->root
.type
== bfd_link_hash_indirect
1643 || h
->root
.type
== bfd_link_hash_warning
)
1644 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1647 /* Check invalid x32 relocations. */
1648 if (!ABI_64_P (abfd
))
1654 case R_X86_64_DTPOFF64
:
1655 case R_X86_64_TPOFF64
:
1657 case R_X86_64_GOTOFF64
:
1658 case R_X86_64_GOT64
:
1659 case R_X86_64_GOTPCREL64
:
1660 case R_X86_64_GOTPC64
:
1661 case R_X86_64_GOTPLT64
:
1662 case R_X86_64_PLTOFF64
:
1665 name
= h
->root
.root
.string
;
1667 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1669 (*_bfd_error_handler
)
1670 (_("%B: relocation %s against symbol `%s' isn't "
1671 "supported in x32 mode"), abfd
,
1672 x86_64_elf_howto_table
[r_type
].name
, name
);
1673 bfd_set_error (bfd_error_bad_value
);
1681 /* Create the ifunc sections for static executables. If we
1682 never see an indirect function symbol nor we are building
1683 a static executable, those sections will be empty and
1684 won't appear in output. */
1690 case R_X86_64_PC32_BND
:
1691 case R_X86_64_PLT32_BND
:
1693 case R_X86_64_PLT32
:
1696 /* MPX PLT is supported only if elf_x86_64_arch_bed
1697 is used in 64-bit mode. */
1700 && (get_elf_x86_64_backend_data (abfd
)
1701 == &elf_x86_64_arch_bed
))
1703 elf_x86_64_hash_entry (h
)->has_bnd_reloc
= 1;
1705 /* Create the second PLT for Intel MPX support. */
1706 if (htab
->plt_bnd
== NULL
)
1708 unsigned int plt_bnd_align
;
1709 const struct elf_backend_data
*bed
;
1711 bed
= get_elf_backend_data (info
->output_bfd
);
1712 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
) == 8
1713 && (sizeof (elf_x86_64_bnd_plt2_entry
)
1714 == sizeof (elf_x86_64_legacy_plt2_entry
)));
1717 if (htab
->elf
.dynobj
== NULL
)
1718 htab
->elf
.dynobj
= abfd
;
1720 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1722 (bed
->dynamic_sec_flags
1727 if (htab
->plt_bnd
== NULL
1728 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
1737 case R_X86_64_GOTPCREL
:
1738 case R_X86_64_GOTPCRELX
:
1739 case R_X86_64_REX_GOTPCRELX
:
1740 case R_X86_64_GOTPCREL64
:
1741 if (htab
->elf
.dynobj
== NULL
)
1742 htab
->elf
.dynobj
= abfd
;
1743 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1748 /* It is referenced by a non-shared object. */
1750 h
->root
.non_ir_ref
= 1;
1752 if (h
->type
== STT_GNU_IFUNC
)
1753 elf_tdata (info
->output_bfd
)->has_gnu_symbols
1754 |= elf_gnu_symbol_ifunc
;
1757 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1758 symtab_hdr
, sym_hashes
,
1759 &r_type
, GOT_UNKNOWN
,
1760 rel
, rel_end
, h
, r_symndx
))
1765 case R_X86_64_TLSLD
:
1766 htab
->tls_ld_got
.refcount
+= 1;
1769 case R_X86_64_TPOFF32
:
1770 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
1773 name
= h
->root
.root
.string
;
1775 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1777 (*_bfd_error_handler
)
1778 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1780 x86_64_elf_howto_table
[r_type
].name
, name
);
1781 bfd_set_error (bfd_error_bad_value
);
1786 case R_X86_64_GOTTPOFF
:
1787 if (!bfd_link_executable (info
))
1788 info
->flags
|= DF_STATIC_TLS
;
1791 case R_X86_64_GOT32
:
1792 case R_X86_64_GOTPCREL
:
1793 case R_X86_64_GOTPCRELX
:
1794 case R_X86_64_REX_GOTPCRELX
:
1795 case R_X86_64_TLSGD
:
1796 case R_X86_64_GOT64
:
1797 case R_X86_64_GOTPCREL64
:
1798 case R_X86_64_GOTPLT64
:
1799 case R_X86_64_GOTPC32_TLSDESC
:
1800 case R_X86_64_TLSDESC_CALL
:
1801 /* This symbol requires a global offset table entry. */
1803 int tls_type
, old_tls_type
;
1807 default: tls_type
= GOT_NORMAL
; break;
1808 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1809 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1810 case R_X86_64_GOTPC32_TLSDESC
:
1811 case R_X86_64_TLSDESC_CALL
:
1812 tls_type
= GOT_TLS_GDESC
; break;
1817 h
->got
.refcount
+= 1;
1818 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1822 bfd_signed_vma
*local_got_refcounts
;
1824 /* This is a global offset table entry for a local symbol. */
1825 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1826 if (local_got_refcounts
== NULL
)
1830 size
= symtab_hdr
->sh_info
;
1831 size
*= sizeof (bfd_signed_vma
)
1832 + sizeof (bfd_vma
) + sizeof (char);
1833 local_got_refcounts
= ((bfd_signed_vma
*)
1834 bfd_zalloc (abfd
, size
));
1835 if (local_got_refcounts
== NULL
)
1837 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1838 elf_x86_64_local_tlsdesc_gotent (abfd
)
1839 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1840 elf_x86_64_local_got_tls_type (abfd
)
1841 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1843 local_got_refcounts
[r_symndx
] += 1;
1845 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1848 /* If a TLS symbol is accessed using IE at least once,
1849 there is no point to use dynamic model for it. */
1850 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1851 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1852 || tls_type
!= GOT_TLS_IE
))
1854 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1855 tls_type
= old_tls_type
;
1856 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1857 && GOT_TLS_GD_ANY_P (tls_type
))
1858 tls_type
|= old_tls_type
;
1862 name
= h
->root
.root
.string
;
1864 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1866 (*_bfd_error_handler
)
1867 (_("%B: '%s' accessed both as normal and thread local symbol"),
1869 bfd_set_error (bfd_error_bad_value
);
1874 if (old_tls_type
!= tls_type
)
1877 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1879 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1884 case R_X86_64_GOTOFF64
:
1885 case R_X86_64_GOTPC32
:
1886 case R_X86_64_GOTPC64
:
1888 if (htab
->elf
.sgot
== NULL
)
1890 if (htab
->elf
.dynobj
== NULL
)
1891 htab
->elf
.dynobj
= abfd
;
1892 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1898 case R_X86_64_PLT32
:
1899 case R_X86_64_PLT32_BND
:
1900 /* This symbol requires a procedure linkage table entry. We
1901 actually build the entry in adjust_dynamic_symbol,
1902 because this might be a case of linking PIC code which is
1903 never referenced by a dynamic object, in which case we
1904 don't need to generate a procedure linkage table entry
1907 /* If this is a local symbol, we resolve it directly without
1908 creating a procedure linkage table entry. */
1913 h
->plt
.refcount
+= 1;
1916 case R_X86_64_PLTOFF64
:
1917 /* This tries to form the 'address' of a function relative
1918 to GOT. For global symbols we need a PLT entry. */
1922 h
->plt
.refcount
+= 1;
1926 case R_X86_64_SIZE32
:
1927 case R_X86_64_SIZE64
:
1932 if (!ABI_64_P (abfd
))
1937 /* Let's help debug shared library creation. These relocs
1938 cannot be used in shared libs. Don't error out for
1939 sections we don't care about, such as debug sections or
1940 non-constant sections. */
1941 if (bfd_link_pic (info
)
1942 && (sec
->flags
& SEC_ALLOC
) != 0
1943 && (sec
->flags
& SEC_READONLY
) != 0)
1946 name
= h
->root
.root
.string
;
1948 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1949 (*_bfd_error_handler
)
1950 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1951 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1952 bfd_set_error (bfd_error_bad_value
);
1960 case R_X86_64_PC32_BND
:
1964 if (h
!= NULL
&& bfd_link_executable (info
))
1966 /* If this reloc is in a read-only section, we might
1967 need a copy reloc. We can't check reliably at this
1968 stage whether the section is read-only, as input
1969 sections have not yet been mapped to output sections.
1970 Tentatively set the flag for now, and correct in
1971 adjust_dynamic_symbol. */
1974 /* We may need a .plt entry if the function this reloc
1975 refers to is in a shared lib. */
1976 h
->plt
.refcount
+= 1;
1977 if (r_type
== R_X86_64_PC32
)
1979 /* Since something like ".long foo - ." may be used
1980 as pointer, make sure that PLT is used if foo is
1981 a function defined in a shared library. */
1982 if ((sec
->flags
& SEC_CODE
) == 0)
1983 h
->pointer_equality_needed
= 1;
1985 else if (r_type
!= R_X86_64_PC32_BND
1986 && r_type
!= R_X86_64_PC64
)
1988 h
->pointer_equality_needed
= 1;
1989 /* At run-time, R_X86_64_64 can be resolved for both
1990 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
1991 can only be resolved for x32. */
1992 if ((sec
->flags
& SEC_READONLY
) == 0
1993 && (r_type
== R_X86_64_64
1994 || (!ABI_64_P (abfd
)
1995 && (r_type
== R_X86_64_32
1996 || r_type
== R_X86_64_32S
))))
1998 struct elf_x86_64_link_hash_entry
*eh
1999 = (struct elf_x86_64_link_hash_entry
*) h
;
2000 eh
->func_pointer_refcount
+= 1;
2007 /* If we are creating a shared library, and this is a reloc
2008 against a global symbol, or a non PC relative reloc
2009 against a local symbol, then we need to copy the reloc
2010 into the shared library. However, if we are linking with
2011 -Bsymbolic, we do not need to copy a reloc against a
2012 global symbol which is defined in an object we are
2013 including in the link (i.e., DEF_REGULAR is set). At
2014 this point we have not seen all the input files, so it is
2015 possible that DEF_REGULAR is not set now but will be set
2016 later (it is never cleared). In case of a weak definition,
2017 DEF_REGULAR may be cleared later by a strong definition in
2018 a shared library. We account for that possibility below by
2019 storing information in the relocs_copied field of the hash
2020 table entry. A similar situation occurs when creating
2021 shared libraries and symbol visibility changes render the
2024 If on the other hand, we are creating an executable, we
2025 may need to keep relocations for symbols satisfied by a
2026 dynamic library if we manage to avoid copy relocs for the
2028 if ((bfd_link_pic (info
)
2029 && (sec
->flags
& SEC_ALLOC
) != 0
2030 && (! IS_X86_64_PCREL_TYPE (r_type
)
2032 && (! SYMBOLIC_BIND (info
, h
)
2033 || h
->root
.type
== bfd_link_hash_defweak
2034 || !h
->def_regular
))))
2035 || (ELIMINATE_COPY_RELOCS
2036 && !bfd_link_pic (info
)
2037 && (sec
->flags
& SEC_ALLOC
) != 0
2039 && (h
->root
.type
== bfd_link_hash_defweak
2040 || !h
->def_regular
)))
2042 struct elf_dyn_relocs
*p
;
2043 struct elf_dyn_relocs
**head
;
2045 /* We must copy these reloc types into the output file.
2046 Create a reloc section in dynobj and make room for
2050 if (htab
->elf
.dynobj
== NULL
)
2051 htab
->elf
.dynobj
= abfd
;
2053 sreloc
= _bfd_elf_make_dynamic_reloc_section
2054 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
2055 abfd
, /*rela?*/ TRUE
);
2061 /* If this is a global symbol, we count the number of
2062 relocations we need for this symbol. */
2065 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
2069 /* Track dynamic relocs needed for local syms too.
2070 We really need local syms available to do this
2075 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2080 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2084 /* Beware of type punned pointers vs strict aliasing
2086 vpp
= &(elf_section_data (s
)->local_dynrel
);
2087 head
= (struct elf_dyn_relocs
**)vpp
;
2091 if (p
== NULL
|| p
->sec
!= sec
)
2093 bfd_size_type amt
= sizeof *p
;
2095 p
= ((struct elf_dyn_relocs
*)
2096 bfd_alloc (htab
->elf
.dynobj
, amt
));
2107 /* Count size relocation as PC-relative relocation. */
2108 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2113 /* This relocation describes the C++ object vtable hierarchy.
2114 Reconstruct it for later use during GC. */
2115 case R_X86_64_GNU_VTINHERIT
:
2116 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2120 /* This relocation describes which C++ vtable entries are actually
2121 used. Record for later use during GC. */
2122 case R_X86_64_GNU_VTENTRY
:
2123 BFD_ASSERT (h
!= NULL
);
2125 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2135 && h
->plt
.refcount
> 0
2136 && (((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2137 || h
->got
.refcount
> 0)
2138 && htab
->plt_got
== NULL
)
2140 /* Create the GOT procedure linkage table. */
2141 unsigned int plt_got_align
;
2142 const struct elf_backend_data
*bed
;
2144 bed
= get_elf_backend_data (info
->output_bfd
);
2145 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry
) == 8
2146 && (sizeof (elf_x86_64_bnd_plt2_entry
)
2147 == sizeof (elf_x86_64_legacy_plt2_entry
)));
2150 if (htab
->elf
.dynobj
== NULL
)
2151 htab
->elf
.dynobj
= abfd
;
2153 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2155 (bed
->dynamic_sec_flags
2160 if (htab
->plt_got
== NULL
2161 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2167 if ((r_type
== R_X86_64_GOTPCREL
2168 || r_type
== R_X86_64_GOTPCRELX
2169 || r_type
== R_X86_64_REX_GOTPCRELX
)
2170 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2171 sec
->need_convert_load
= 1;
2177 /* Return the section that should be marked against GC for a given
2181 elf_x86_64_gc_mark_hook (asection
*sec
,
2182 struct bfd_link_info
*info
,
2183 Elf_Internal_Rela
*rel
,
2184 struct elf_link_hash_entry
*h
,
2185 Elf_Internal_Sym
*sym
)
2188 switch (ELF32_R_TYPE (rel
->r_info
))
2190 case R_X86_64_GNU_VTINHERIT
:
2191 case R_X86_64_GNU_VTENTRY
:
2195 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2198 /* Update the got entry reference counts for the section being removed. */
2201 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
2203 const Elf_Internal_Rela
*relocs
)
2205 struct elf_x86_64_link_hash_table
*htab
;
2206 Elf_Internal_Shdr
*symtab_hdr
;
2207 struct elf_link_hash_entry
**sym_hashes
;
2208 bfd_signed_vma
*local_got_refcounts
;
2209 const Elf_Internal_Rela
*rel
, *relend
;
2211 if (bfd_link_relocatable (info
))
2214 htab
= elf_x86_64_hash_table (info
);
2218 elf_section_data (sec
)->local_dynrel
= NULL
;
2220 symtab_hdr
= &elf_symtab_hdr (abfd
);
2221 sym_hashes
= elf_sym_hashes (abfd
);
2222 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2224 htab
= elf_x86_64_hash_table (info
);
2225 relend
= relocs
+ sec
->reloc_count
;
2226 for (rel
= relocs
; rel
< relend
; rel
++)
2228 unsigned long r_symndx
;
2229 unsigned int r_type
;
2230 struct elf_link_hash_entry
*h
= NULL
;
2231 bfd_boolean pointer_reloc
;
2233 r_symndx
= htab
->r_sym (rel
->r_info
);
2234 if (r_symndx
>= symtab_hdr
->sh_info
)
2236 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2237 while (h
->root
.type
== bfd_link_hash_indirect
2238 || h
->root
.type
== bfd_link_hash_warning
)
2239 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2243 /* A local symbol. */
2244 Elf_Internal_Sym
*isym
;
2246 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2249 /* Check relocation against local STT_GNU_IFUNC symbol. */
2251 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2253 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2261 struct elf_x86_64_link_hash_entry
*eh
;
2262 struct elf_dyn_relocs
**pp
;
2263 struct elf_dyn_relocs
*p
;
2265 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2267 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2270 /* Everything must go for SEC. */
2276 r_type
= ELF32_R_TYPE (rel
->r_info
);
2277 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2278 symtab_hdr
, sym_hashes
,
2279 &r_type
, GOT_UNKNOWN
,
2280 rel
, relend
, h
, r_symndx
))
2283 pointer_reloc
= FALSE
;
2286 case R_X86_64_TLSLD
:
2287 if (htab
->tls_ld_got
.refcount
> 0)
2288 htab
->tls_ld_got
.refcount
-= 1;
2291 case R_X86_64_TLSGD
:
2292 case R_X86_64_GOTPC32_TLSDESC
:
2293 case R_X86_64_TLSDESC_CALL
:
2294 case R_X86_64_GOTTPOFF
:
2295 case R_X86_64_GOT32
:
2296 case R_X86_64_GOTPCREL
:
2297 case R_X86_64_GOTPCRELX
:
2298 case R_X86_64_REX_GOTPCRELX
:
2299 case R_X86_64_GOT64
:
2300 case R_X86_64_GOTPCREL64
:
2301 case R_X86_64_GOTPLT64
:
2304 if (h
->got
.refcount
> 0)
2305 h
->got
.refcount
-= 1;
2306 if (h
->type
== STT_GNU_IFUNC
)
2308 if (h
->plt
.refcount
> 0)
2309 h
->plt
.refcount
-= 1;
2312 else if (local_got_refcounts
!= NULL
)
2314 if (local_got_refcounts
[r_symndx
] > 0)
2315 local_got_refcounts
[r_symndx
] -= 1;
2321 pointer_reloc
= !ABI_64_P (abfd
);
2325 pointer_reloc
= TRUE
;
2331 case R_X86_64_PC32_BND
:
2333 case R_X86_64_SIZE32
:
2334 case R_X86_64_SIZE64
:
2336 if (bfd_link_pic (info
)
2337 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2341 case R_X86_64_PLT32
:
2342 case R_X86_64_PLT32_BND
:
2343 case R_X86_64_PLTOFF64
:
2346 if (h
->plt
.refcount
> 0)
2347 h
->plt
.refcount
-= 1;
2348 if (pointer_reloc
&& (sec
->flags
& SEC_READONLY
) == 0)
2350 struct elf_x86_64_link_hash_entry
*eh
2351 = (struct elf_x86_64_link_hash_entry
*) h
;
2352 if (eh
->func_pointer_refcount
> 0)
2353 eh
->func_pointer_refcount
-= 1;
2366 /* Adjust a symbol defined by a dynamic object and referenced by a
2367 regular object. The current definition is in some section of the
2368 dynamic object, but we're not including those sections. We have to
2369 change the definition to something the rest of the link can
2373 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2374 struct elf_link_hash_entry
*h
)
2376 struct elf_x86_64_link_hash_table
*htab
;
2378 struct elf_x86_64_link_hash_entry
*eh
;
2379 struct elf_dyn_relocs
*p
;
2381 /* STT_GNU_IFUNC symbol must go through PLT. */
2382 if (h
->type
== STT_GNU_IFUNC
)
2384 /* All local STT_GNU_IFUNC references must be treate as local
2385 calls via local PLT. */
2387 && SYMBOL_CALLS_LOCAL (info
, h
))
2389 bfd_size_type pc_count
= 0, count
= 0;
2390 struct elf_dyn_relocs
**pp
;
2392 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2393 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2395 pc_count
+= p
->pc_count
;
2396 p
->count
-= p
->pc_count
;
2405 if (pc_count
|| count
)
2409 if (h
->plt
.refcount
<= 0)
2410 h
->plt
.refcount
= 1;
2412 h
->plt
.refcount
+= 1;
2416 if (h
->plt
.refcount
<= 0)
2418 h
->plt
.offset
= (bfd_vma
) -1;
2424 /* If this is a function, put it in the procedure linkage table. We
2425 will fill in the contents of the procedure linkage table later,
2426 when we know the address of the .got section. */
2427 if (h
->type
== STT_FUNC
2430 if (h
->plt
.refcount
<= 0
2431 || SYMBOL_CALLS_LOCAL (info
, h
)
2432 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2433 && h
->root
.type
== bfd_link_hash_undefweak
))
2435 /* This case can occur if we saw a PLT32 reloc in an input
2436 file, but the symbol was never referred to by a dynamic
2437 object, or if all references were garbage collected. In
2438 such a case, we don't actually need to build a procedure
2439 linkage table, and we can just do a PC32 reloc instead. */
2440 h
->plt
.offset
= (bfd_vma
) -1;
2447 /* It's possible that we incorrectly decided a .plt reloc was
2448 needed for an R_X86_64_PC32 reloc to a non-function sym in
2449 check_relocs. We can't decide accurately between function and
2450 non-function syms in check-relocs; Objects loaded later in
2451 the link may change h->type. So fix it now. */
2452 h
->plt
.offset
= (bfd_vma
) -1;
2454 /* If this is a weak symbol, and there is a real definition, the
2455 processor independent code will have arranged for us to see the
2456 real definition first, and we can just use the same value. */
2457 if (h
->u
.weakdef
!= NULL
)
2459 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2460 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2461 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2462 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2463 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2465 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2466 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2467 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
2472 /* This is a reference to a symbol defined by a dynamic object which
2473 is not a function. */
2475 /* If we are creating a shared library, we must presume that the
2476 only references to the symbol are via the global offset table.
2477 For such cases we need not do anything here; the relocations will
2478 be handled correctly by relocate_section. */
2479 if (!bfd_link_executable (info
))
2482 /* If there are no references to this symbol that do not use the
2483 GOT, we don't need to generate a copy reloc. */
2484 if (!h
->non_got_ref
)
2487 /* If -z nocopyreloc was given, we won't generate them either. */
2488 if (info
->nocopyreloc
)
2494 if (ELIMINATE_COPY_RELOCS
)
2496 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2497 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2499 s
= p
->sec
->output_section
;
2500 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2504 /* If we didn't find any dynamic relocs in read-only sections, then
2505 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2513 /* We must allocate the symbol in our .dynbss section, which will
2514 become part of the .bss section of the executable. There will be
2515 an entry for this symbol in the .dynsym section. The dynamic
2516 object will contain position independent code, so all references
2517 from the dynamic object to this symbol will go through the global
2518 offset table. The dynamic linker will use the .dynsym entry to
2519 determine the address it must put in the global offset table, so
2520 both the dynamic object and the regular object will refer to the
2521 same memory location for the variable. */
2523 htab
= elf_x86_64_hash_table (info
);
2527 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2528 to copy the initial value out of the dynamic object and into the
2529 runtime process image. */
2530 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2532 const struct elf_backend_data
*bed
;
2533 bed
= get_elf_backend_data (info
->output_bfd
);
2534 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2540 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
2543 /* Allocate space in .plt, .got and associated reloc sections for
2547 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2549 struct bfd_link_info
*info
;
2550 struct elf_x86_64_link_hash_table
*htab
;
2551 struct elf_x86_64_link_hash_entry
*eh
;
2552 struct elf_dyn_relocs
*p
;
2553 const struct elf_backend_data
*bed
;
2554 unsigned int plt_entry_size
;
2556 if (h
->root
.type
== bfd_link_hash_indirect
)
2559 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2561 info
= (struct bfd_link_info
*) inf
;
2562 htab
= elf_x86_64_hash_table (info
);
2565 bed
= get_elf_backend_data (info
->output_bfd
);
2566 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2568 /* We can't use the GOT PLT if pointer equality is needed since
2569 finish_dynamic_symbol won't clear symbol value and the dynamic
2570 linker won't update the GOT slot. We will get into an infinite
2571 loop at run-time. */
2572 if (htab
->plt_got
!= NULL
2573 && h
->type
!= STT_GNU_IFUNC
2574 && !h
->pointer_equality_needed
2575 && h
->plt
.refcount
> 0
2576 && h
->got
.refcount
> 0)
2578 /* Don't use the regular PLT if there are both GOT and GOTPLT
2580 h
->plt
.offset
= (bfd_vma
) -1;
2582 /* Use the GOT PLT. */
2583 eh
->plt_got
.refcount
= 1;
2586 /* Clear the reference count of function pointer relocations if
2587 symbol isn't a normal function. */
2588 if (h
->type
!= STT_FUNC
)
2589 eh
->func_pointer_refcount
= 0;
2591 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2592 here if it is defined and referenced in a non-shared object. */
2593 if (h
->type
== STT_GNU_IFUNC
2596 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2602 asection
*s
= htab
->plt_bnd
;
2603 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
2605 /* Use the .plt.bnd section if it is created. */
2606 eh
->plt_bnd
.offset
= s
->size
;
2608 /* Make room for this entry in the .plt.bnd section. */
2609 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2617 /* Don't create the PLT entry if there are only function pointer
2618 relocations which can be resolved at run-time. */
2619 else if (htab
->elf
.dynamic_sections_created
2620 && (h
->plt
.refcount
> eh
->func_pointer_refcount
2621 || eh
->plt_got
.refcount
> 0))
2623 bfd_boolean use_plt_got
;
2625 /* Clear the reference count of function pointer relocations
2627 eh
->func_pointer_refcount
= 0;
2629 if ((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2631 /* Don't use the regular PLT for DF_BIND_NOW. */
2632 h
->plt
.offset
= (bfd_vma
) -1;
2634 /* Use the GOT PLT. */
2635 h
->got
.refcount
= 1;
2636 eh
->plt_got
.refcount
= 1;
2639 use_plt_got
= eh
->plt_got
.refcount
> 0;
2641 /* Make sure this symbol is output as a dynamic symbol.
2642 Undefined weak syms won't yet be marked as dynamic. */
2643 if (h
->dynindx
== -1
2644 && !h
->forced_local
)
2646 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2650 if (bfd_link_pic (info
)
2651 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2653 asection
*s
= htab
->elf
.splt
;
2654 asection
*bnd_s
= htab
->plt_bnd
;
2655 asection
*got_s
= htab
->plt_got
;
2657 /* If this is the first .plt entry, make room for the special
2658 first entry. The .plt section is used by prelink to undo
2659 prelinking for dynamic relocations. */
2661 s
->size
= plt_entry_size
;
2664 eh
->plt_got
.offset
= got_s
->size
;
2667 h
->plt
.offset
= s
->size
;
2669 eh
->plt_bnd
.offset
= bnd_s
->size
;
2672 /* If this symbol is not defined in a regular file, and we are
2673 not generating a shared library, then set the symbol to this
2674 location in the .plt. This is required to make function
2675 pointers compare as equal between the normal executable and
2676 the shared library. */
2677 if (! bfd_link_pic (info
)
2682 /* We need to make a call to the entry of the GOT PLT
2683 instead of regular PLT entry. */
2684 h
->root
.u
.def
.section
= got_s
;
2685 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
2691 /* We need to make a call to the entry of the second
2692 PLT instead of regular PLT entry. */
2693 h
->root
.u
.def
.section
= bnd_s
;
2694 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
2698 h
->root
.u
.def
.section
= s
;
2699 h
->root
.u
.def
.value
= h
->plt
.offset
;
2704 /* Make room for this entry. */
2706 got_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2709 s
->size
+= plt_entry_size
;
2711 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2713 /* We also need to make an entry in the .got.plt section,
2714 which will be placed in the .got section by the linker
2716 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2718 /* We also need to make an entry in the .rela.plt
2720 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2721 htab
->elf
.srelplt
->reloc_count
++;
2726 h
->plt
.offset
= (bfd_vma
) -1;
2732 h
->plt
.offset
= (bfd_vma
) -1;
2736 eh
->tlsdesc_got
= (bfd_vma
) -1;
2738 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2739 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2740 if (h
->got
.refcount
> 0
2741 && bfd_link_executable (info
)
2743 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2745 h
->got
.offset
= (bfd_vma
) -1;
2747 else if (h
->got
.refcount
> 0)
2751 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2753 /* Make sure this symbol is output as a dynamic symbol.
2754 Undefined weak syms won't yet be marked as dynamic. */
2755 if (h
->dynindx
== -1
2756 && !h
->forced_local
)
2758 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2762 if (GOT_TLS_GDESC_P (tls_type
))
2764 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2765 - elf_x86_64_compute_jump_table_size (htab
);
2766 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2767 h
->got
.offset
= (bfd_vma
) -2;
2769 if (! GOT_TLS_GDESC_P (tls_type
)
2770 || GOT_TLS_GD_P (tls_type
))
2773 h
->got
.offset
= s
->size
;
2774 s
->size
+= GOT_ENTRY_SIZE
;
2775 if (GOT_TLS_GD_P (tls_type
))
2776 s
->size
+= GOT_ENTRY_SIZE
;
2778 dyn
= htab
->elf
.dynamic_sections_created
;
2779 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2781 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2782 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2783 || tls_type
== GOT_TLS_IE
)
2784 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2785 else if (GOT_TLS_GD_P (tls_type
))
2786 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2787 else if (! GOT_TLS_GDESC_P (tls_type
)
2788 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2789 || h
->root
.type
!= bfd_link_hash_undefweak
)
2790 && (bfd_link_pic (info
)
2791 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2792 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2793 if (GOT_TLS_GDESC_P (tls_type
))
2795 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2796 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2800 h
->got
.offset
= (bfd_vma
) -1;
2802 if (eh
->dyn_relocs
== NULL
)
2805 /* In the shared -Bsymbolic case, discard space allocated for
2806 dynamic pc-relative relocs against symbols which turn out to be
2807 defined in regular objects. For the normal shared case, discard
2808 space for pc-relative relocs that have become local due to symbol
2809 visibility changes. */
2811 if (bfd_link_pic (info
))
2813 /* Relocs that use pc_count are those that appear on a call
2814 insn, or certain REL relocs that can generated via assembly.
2815 We want calls to protected symbols to resolve directly to the
2816 function rather than going via the plt. If people want
2817 function pointer comparisons to work as expected then they
2818 should avoid writing weird assembly. */
2819 if (SYMBOL_CALLS_LOCAL (info
, h
))
2821 struct elf_dyn_relocs
**pp
;
2823 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2825 p
->count
-= p
->pc_count
;
2834 /* Also discard relocs on undefined weak syms with non-default
2836 if (eh
->dyn_relocs
!= NULL
)
2838 if (h
->root
.type
== bfd_link_hash_undefweak
)
2840 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2841 eh
->dyn_relocs
= NULL
;
2843 /* Make sure undefined weak symbols are output as a dynamic
2845 else if (h
->dynindx
== -1
2846 && ! h
->forced_local
2847 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2850 /* For PIE, discard space for pc-relative relocs against
2851 symbols which turn out to need copy relocs. */
2852 else if (bfd_link_executable (info
)
2853 && (h
->needs_copy
|| eh
->needs_copy
)
2857 struct elf_dyn_relocs
**pp
;
2859 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2861 if (p
->pc_count
!= 0)
2869 else if (ELIMINATE_COPY_RELOCS
)
2871 /* For the non-shared case, discard space for relocs against
2872 symbols which turn out to need copy relocs or are not
2873 dynamic. Keep dynamic relocations for run-time function
2874 pointer initialization. */
2876 if ((!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
2879 || (htab
->elf
.dynamic_sections_created
2880 && (h
->root
.type
== bfd_link_hash_undefweak
2881 || h
->root
.type
== bfd_link_hash_undefined
))))
2883 /* Make sure this symbol is output as a dynamic symbol.
2884 Undefined weak syms won't yet be marked as dynamic. */
2885 if (h
->dynindx
== -1
2886 && ! h
->forced_local
2887 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2890 /* If that succeeded, we know we'll be keeping all the
2892 if (h
->dynindx
!= -1)
2896 eh
->dyn_relocs
= NULL
;
2897 eh
->func_pointer_refcount
= 0;
2902 /* Finally, allocate space. */
2903 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2907 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2909 BFD_ASSERT (sreloc
!= NULL
);
2911 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2917 /* Allocate space in .plt, .got and associated reloc sections for
2918 local dynamic relocs. */
2921 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2923 struct elf_link_hash_entry
*h
2924 = (struct elf_link_hash_entry
*) *slot
;
2926 if (h
->type
!= STT_GNU_IFUNC
2930 || h
->root
.type
!= bfd_link_hash_defined
)
2933 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2936 /* Find any dynamic relocs that apply to read-only sections. */
2939 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2942 struct elf_x86_64_link_hash_entry
*eh
;
2943 struct elf_dyn_relocs
*p
;
2945 /* Skip local IFUNC symbols. */
2946 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2949 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2950 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2952 asection
*s
= p
->sec
->output_section
;
2954 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2956 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2958 info
->flags
|= DF_TEXTREL
;
2960 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
2961 || info
->error_textrel
)
2962 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2963 p
->sec
->owner
, h
->root
.root
.string
,
2966 /* Not an error, just cut short the traversal. */
2973 /* With the local symbol, foo, we convert
2974 mov foo@GOTPCREL(%rip), %reg
2978 call/jmp *foo@GOTPCREL(%rip)
2980 nop call foo/jmp foo nop
2981 When PIC is false, convert
2982 test %reg, foo@GOTPCREL(%rip)
2986 binop foo@GOTPCREL(%rip), %reg
2989 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2993 elf_x86_64_convert_load (bfd
*abfd
, asection
*sec
,
2994 struct bfd_link_info
*link_info
)
2996 Elf_Internal_Shdr
*symtab_hdr
;
2997 Elf_Internal_Rela
*internal_relocs
;
2998 Elf_Internal_Rela
*irel
, *irelend
;
3000 struct elf_x86_64_link_hash_table
*htab
;
3001 bfd_boolean changed_contents
;
3002 bfd_boolean changed_relocs
;
3003 bfd_signed_vma
*local_got_refcounts
;
3004 bfd_vma maxpagesize
;
3006 /* Don't even try to convert non-ELF outputs. */
3007 if (!is_elf_hash_table (link_info
->hash
))
3010 /* Nothing to do if there is no need or no output. */
3011 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
3012 || sec
->need_convert_load
== 0
3013 || bfd_is_abs_section (sec
->output_section
))
3016 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3018 /* Load the relocations for this section. */
3019 internal_relocs
= (_bfd_elf_link_read_relocs
3020 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
3021 link_info
->keep_memory
));
3022 if (internal_relocs
== NULL
)
3025 htab
= elf_x86_64_hash_table (link_info
);
3026 changed_contents
= FALSE
;
3027 changed_relocs
= FALSE
;
3028 local_got_refcounts
= elf_local_got_refcounts (abfd
);
3029 maxpagesize
= get_elf_backend_data (abfd
)->maxpagesize
;
3031 /* Get the section contents. */
3032 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
3033 contents
= elf_section_data (sec
)->this_hdr
.contents
;
3036 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
3040 irelend
= internal_relocs
+ sec
->reloc_count
;
3041 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
3043 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
3044 unsigned int r_symndx
= htab
->r_sym (irel
->r_info
);
3046 struct elf_link_hash_entry
*h
;
3050 bfd_signed_vma raddend
;
3051 unsigned int opcode
;
3054 if (r_type
!= R_X86_64_GOTPCREL
3055 && r_type
!= R_X86_64_GOTPCRELX
3056 && r_type
!= R_X86_64_REX_GOTPCRELX
)
3059 roff
= irel
->r_offset
;
3060 if (roff
< (r_type
== R_X86_64_REX_GOTPCRELX
? 3 : 2))
3063 raddend
= irel
->r_addend
;
3064 /* Addend for 32-bit PC-relative relocation must be -4. */
3068 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
3070 /* It is OK to convert mov to lea. */
3073 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
3074 for mov call, jmp or one of adc, add, and, cmp, or, sbb,
3075 sub, test, xor instructions. */
3076 if (r_type
!= R_X86_64_GOTPCRELX
3077 && r_type
!= R_X86_64_REX_GOTPCRELX
)
3080 /* It is OK to convert indirect branch to direct branch. */
3083 /* It is OK to convert adc, add, and, cmp, or, sbb, sub,
3084 test, xor only when PIC is false. */
3085 if (bfd_link_pic (link_info
))
3090 /* Get the symbol referred to by the reloc. */
3091 if (r_symndx
< symtab_hdr
->sh_info
)
3093 Elf_Internal_Sym
*isym
;
3095 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
3098 symtype
= ELF_ST_TYPE (isym
->st_info
);
3100 /* STT_GNU_IFUNC must keep GOTPCREL relocations and skip
3101 relocation against undefined symbols. */
3102 if (symtype
== STT_GNU_IFUNC
|| isym
->st_shndx
== SHN_UNDEF
)
3105 if (isym
->st_shndx
== SHN_ABS
)
3106 tsec
= bfd_abs_section_ptr
;
3107 else if (isym
->st_shndx
== SHN_COMMON
)
3108 tsec
= bfd_com_section_ptr
;
3109 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
3110 tsec
= &_bfd_elf_large_com_section
;
3112 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3115 toff
= isym
->st_value
;
3119 indx
= r_symndx
- symtab_hdr
->sh_info
;
3120 h
= elf_sym_hashes (abfd
)[indx
];
3121 BFD_ASSERT (h
!= NULL
);
3123 while (h
->root
.type
== bfd_link_hash_indirect
3124 || h
->root
.type
== bfd_link_hash_warning
)
3125 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3127 /* STT_GNU_IFUNC must keep GOTPCREL relocations. We also
3128 avoid optimizing GOTPCREL relocations againt _DYNAMIC
3129 since ld.so may use its link-time address. */
3131 || h
->root
.type
== bfd_link_hash_defined
3132 || h
->root
.type
== bfd_link_hash_defweak
)
3133 && h
->type
!= STT_GNU_IFUNC
3134 && h
!= htab
->elf
.hdynamic
3135 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3137 /* bfd_link_hash_new or bfd_link_hash_undefined is
3138 set by an assignment in a linker script in
3139 bfd_elf_record_link_assignment. FIXME: If we
3140 ever get a linker error due relocation overflow,
3141 we will skip this optimization. */
3143 && (h
->root
.type
== bfd_link_hash_new
3144 || h
->root
.type
== bfd_link_hash_undefined
))
3146 tsec
= h
->root
.u
.def
.section
;
3147 toff
= h
->root
.u
.def
.value
;
3154 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3156 /* At this stage in linking, no SEC_MERGE symbol has been
3157 adjusted, so all references to such symbols need to be
3158 passed through _bfd_merged_section_offset. (Later, in
3159 relocate_section, all SEC_MERGE symbols *except* for
3160 section symbols have been adjusted.)
3162 gas may reduce relocations against symbols in SEC_MERGE
3163 sections to a relocation against the section symbol when
3164 the original addend was zero. When the reloc is against
3165 a section symbol we should include the addend in the
3166 offset passed to _bfd_merged_section_offset, since the
3167 location of interest is the original symbol. On the
3168 other hand, an access to "sym+addend" where "sym" is not
3169 a section symbol should not include the addend; Such an
3170 access is presumed to be an offset from "sym"; The
3171 location of interest is just "sym". */
3172 if (symtype
== STT_SECTION
)
3175 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3176 elf_section_data (tsec
)->sec_info
,
3179 if (symtype
!= STT_SECTION
)
3185 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3186 if (tsec
->output_section
== sec
->output_section
)
3188 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3193 bfd_signed_vma distance
;
3195 /* At this point, we don't know the load addresses of TSEC
3196 section nor SEC section. We estimate the distrance between
3197 SEC and TSEC. We store the estimated distances in the
3198 compressed_size field of the output section, which is only
3199 used to decompress the compressed input section. */
3200 if (sec
->output_section
->compressed_size
== 0)
3203 bfd_size_type size
= 0;
3204 for (asect
= link_info
->output_bfd
->sections
;
3206 asect
= asect
->next
)
3209 for (i
= asect
->map_head
.s
;
3213 size
= align_power (size
, i
->alignment_power
);
3216 asect
->compressed_size
= size
;
3220 /* Don't convert GOTPCREL relocations if TSEC isn't placed
3222 distance
= (tsec
->output_section
->compressed_size
3223 - sec
->output_section
->compressed_size
);
3227 /* Take PT_GNU_RELRO segment into account by adding
3229 if ((toff
+ distance
+ maxpagesize
- roff
+ 0x80000000)
3237 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
3242 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
3244 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3247 /* Convert to "jmp foo nop". */
3250 nop_offset
= irel
->r_offset
+ 3;
3251 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3252 irel
->r_offset
-= 1;
3253 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3257 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3260 nop
= link_info
->call_nop_byte
;
3261 if (link_info
->call_nop_as_suffix
)
3263 nop_offset
= irel
->r_offset
+ 3;
3264 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3265 irel
->r_offset
-= 1;
3266 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3269 nop_offset
= irel
->r_offset
- 2;
3271 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
3272 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
3273 r_type
= R_X86_64_PC32
;
3279 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
3280 "lea foo(%rip), %reg". */
3282 r_type
= R_X86_64_PC32
;
3286 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3289 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
3290 "test $foo, %reg". */
3291 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
3296 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
3297 "binop $foo, %reg". */
3298 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
3301 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
3303 if (r_type
== R_X86_64_REX_GOTPCRELX
)
3305 /* Move the R bit to the B bit in REX byte. */
3306 unsigned int rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
3307 rex
= (rex
& ~REX_R
) | (rex
& REX_R
) >> 2;
3308 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
3310 /* No addend for R_X86_64_32S relocation. */
3312 r_type
= R_X86_64_32S
;
3315 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
3318 irel
->r_info
= htab
->r_info (r_symndx
, r_type
);
3319 changed_contents
= TRUE
;
3320 changed_relocs
= TRUE
;
3324 if (h
->got
.refcount
> 0)
3325 h
->got
.refcount
-= 1;
3329 if (local_got_refcounts
!= NULL
3330 && local_got_refcounts
[r_symndx
] > 0)
3331 local_got_refcounts
[r_symndx
] -= 1;
3335 if (contents
!= NULL
3336 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3338 if (!changed_contents
&& !link_info
->keep_memory
)
3342 /* Cache the section contents for elf_link_input_bfd. */
3343 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3347 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3349 if (!changed_relocs
)
3350 free (internal_relocs
);
3352 elf_section_data (sec
)->relocs
= internal_relocs
;
3358 if (contents
!= NULL
3359 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3361 if (internal_relocs
!= NULL
3362 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3363 free (internal_relocs
);
3367 /* Set the sizes of the dynamic sections. */
3370 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3371 struct bfd_link_info
*info
)
3373 struct elf_x86_64_link_hash_table
*htab
;
3378 const struct elf_backend_data
*bed
;
3380 htab
= elf_x86_64_hash_table (info
);
3383 bed
= get_elf_backend_data (output_bfd
);
3385 dynobj
= htab
->elf
.dynobj
;
3389 if (htab
->elf
.dynamic_sections_created
)
3391 /* Set the contents of the .interp section to the interpreter. */
3392 if (bfd_link_executable (info
) && !info
->nointerp
)
3394 s
= bfd_get_linker_section (dynobj
, ".interp");
3397 s
->size
= htab
->dynamic_interpreter_size
;
3398 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3402 /* Set up .got offsets for local syms, and space for local dynamic
3404 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3406 bfd_signed_vma
*local_got
;
3407 bfd_signed_vma
*end_local_got
;
3408 char *local_tls_type
;
3409 bfd_vma
*local_tlsdesc_gotent
;
3410 bfd_size_type locsymcount
;
3411 Elf_Internal_Shdr
*symtab_hdr
;
3414 if (! is_x86_64_elf (ibfd
))
3417 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3419 struct elf_dyn_relocs
*p
;
3421 if (!elf_x86_64_convert_load (ibfd
, s
, info
))
3424 for (p
= (struct elf_dyn_relocs
*)
3425 (elf_section_data (s
)->local_dynrel
);
3429 if (!bfd_is_abs_section (p
->sec
)
3430 && bfd_is_abs_section (p
->sec
->output_section
))
3432 /* Input section has been discarded, either because
3433 it is a copy of a linkonce section or due to
3434 linker script /DISCARD/, so we'll be discarding
3437 else if (p
->count
!= 0)
3439 srel
= elf_section_data (p
->sec
)->sreloc
;
3440 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3441 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3442 && (info
->flags
& DF_TEXTREL
) == 0)
3444 info
->flags
|= DF_TEXTREL
;
3445 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3446 || info
->error_textrel
)
3447 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3448 p
->sec
->owner
, p
->sec
);
3454 local_got
= elf_local_got_refcounts (ibfd
);
3458 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3459 locsymcount
= symtab_hdr
->sh_info
;
3460 end_local_got
= local_got
+ locsymcount
;
3461 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3462 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3464 srel
= htab
->elf
.srelgot
;
3465 for (; local_got
< end_local_got
;
3466 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3468 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3471 if (GOT_TLS_GDESC_P (*local_tls_type
))
3473 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3474 - elf_x86_64_compute_jump_table_size (htab
);
3475 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3476 *local_got
= (bfd_vma
) -2;
3478 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3479 || GOT_TLS_GD_P (*local_tls_type
))
3481 *local_got
= s
->size
;
3482 s
->size
+= GOT_ENTRY_SIZE
;
3483 if (GOT_TLS_GD_P (*local_tls_type
))
3484 s
->size
+= GOT_ENTRY_SIZE
;
3486 if (bfd_link_pic (info
)
3487 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3488 || *local_tls_type
== GOT_TLS_IE
)
3490 if (GOT_TLS_GDESC_P (*local_tls_type
))
3492 htab
->elf
.srelplt
->size
3493 += bed
->s
->sizeof_rela
;
3494 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3496 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3497 || GOT_TLS_GD_P (*local_tls_type
))
3498 srel
->size
+= bed
->s
->sizeof_rela
;
3502 *local_got
= (bfd_vma
) -1;
3506 if (htab
->tls_ld_got
.refcount
> 0)
3508 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3510 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3511 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3512 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3515 htab
->tls_ld_got
.offset
= -1;
3517 /* Allocate global sym .plt and .got entries, and space for global
3518 sym dynamic relocs. */
3519 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3522 /* Allocate .plt and .got entries, and space for local symbols. */
3523 htab_traverse (htab
->loc_hash_table
,
3524 elf_x86_64_allocate_local_dynrelocs
,
3527 /* For every jump slot reserved in the sgotplt, reloc_count is
3528 incremented. However, when we reserve space for TLS descriptors,
3529 it's not incremented, so in order to compute the space reserved
3530 for them, it suffices to multiply the reloc count by the jump
3533 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3534 so that R_X86_64_IRELATIVE entries come last. */
3535 if (htab
->elf
.srelplt
)
3537 htab
->sgotplt_jump_table_size
3538 = elf_x86_64_compute_jump_table_size (htab
);
3539 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3541 else if (htab
->elf
.irelplt
)
3542 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3544 if (htab
->tlsdesc_plt
)
3546 /* If we're not using lazy TLS relocations, don't generate the
3547 PLT and GOT entries they require. */
3548 if ((info
->flags
& DF_BIND_NOW
))
3549 htab
->tlsdesc_plt
= 0;
3552 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3553 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3554 /* Reserve room for the initial entry.
3555 FIXME: we could probably do away with it in this case. */
3556 if (htab
->elf
.splt
->size
== 0)
3557 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3558 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3559 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3563 if (htab
->elf
.sgotplt
)
3565 /* Don't allocate .got.plt section if there are no GOT nor PLT
3566 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3567 if ((htab
->elf
.hgot
== NULL
3568 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3569 && (htab
->elf
.sgotplt
->size
3570 == get_elf_backend_data (output_bfd
)->got_header_size
)
3571 && (htab
->elf
.splt
== NULL
3572 || htab
->elf
.splt
->size
== 0)
3573 && (htab
->elf
.sgot
== NULL
3574 || htab
->elf
.sgot
->size
== 0)
3575 && (htab
->elf
.iplt
== NULL
3576 || htab
->elf
.iplt
->size
== 0)
3577 && (htab
->elf
.igotplt
== NULL
3578 || htab
->elf
.igotplt
->size
== 0))
3579 htab
->elf
.sgotplt
->size
= 0;
3582 if (htab
->plt_eh_frame
!= NULL
3583 && htab
->elf
.splt
!= NULL
3584 && htab
->elf
.splt
->size
!= 0
3585 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3586 && _bfd_elf_eh_frame_present (info
))
3588 const struct elf_x86_64_backend_data
*arch_data
3589 = get_elf_x86_64_arch_data (bed
);
3590 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3593 /* We now have determined the sizes of the various dynamic sections.
3594 Allocate memory for them. */
3596 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3598 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3601 if (s
== htab
->elf
.splt
3602 || s
== htab
->elf
.sgot
3603 || s
== htab
->elf
.sgotplt
3604 || s
== htab
->elf
.iplt
3605 || s
== htab
->elf
.igotplt
3606 || s
== htab
->plt_bnd
3607 || s
== htab
->plt_got
3608 || s
== htab
->plt_eh_frame
3609 || s
== htab
->sdynbss
)
3611 /* Strip this section if we don't need it; see the
3614 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3616 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3619 /* We use the reloc_count field as a counter if we need
3620 to copy relocs into the output file. */
3621 if (s
!= htab
->elf
.srelplt
)
3626 /* It's not one of our sections, so don't allocate space. */
3632 /* If we don't need this section, strip it from the
3633 output file. This is mostly to handle .rela.bss and
3634 .rela.plt. We must create both sections in
3635 create_dynamic_sections, because they must be created
3636 before the linker maps input sections to output
3637 sections. The linker does that before
3638 adjust_dynamic_symbol is called, and it is that
3639 function which decides whether anything needs to go
3640 into these sections. */
3642 s
->flags
|= SEC_EXCLUDE
;
3646 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3649 /* Allocate memory for the section contents. We use bfd_zalloc
3650 here in case unused entries are not reclaimed before the
3651 section's contents are written out. This should not happen,
3652 but this way if it does, we get a R_X86_64_NONE reloc instead
3654 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3655 if (s
->contents
== NULL
)
3659 if (htab
->plt_eh_frame
!= NULL
3660 && htab
->plt_eh_frame
->contents
!= NULL
)
3662 const struct elf_x86_64_backend_data
*arch_data
3663 = get_elf_x86_64_arch_data (bed
);
3665 memcpy (htab
->plt_eh_frame
->contents
,
3666 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3667 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3668 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3671 if (htab
->elf
.dynamic_sections_created
)
3673 /* Add some entries to the .dynamic section. We fill in the
3674 values later, in elf_x86_64_finish_dynamic_sections, but we
3675 must add the entries now so that we get the correct size for
3676 the .dynamic section. The DT_DEBUG entry is filled in by the
3677 dynamic linker and used by the debugger. */
3678 #define add_dynamic_entry(TAG, VAL) \
3679 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3681 if (bfd_link_executable (info
))
3683 if (!add_dynamic_entry (DT_DEBUG
, 0))
3687 if (htab
->elf
.splt
->size
!= 0)
3689 /* DT_PLTGOT is used by prelink even if there is no PLT
3691 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3694 if (htab
->elf
.srelplt
->size
!= 0)
3696 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3697 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3698 || !add_dynamic_entry (DT_JMPREL
, 0))
3702 if (htab
->tlsdesc_plt
3703 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3704 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3710 if (!add_dynamic_entry (DT_RELA
, 0)
3711 || !add_dynamic_entry (DT_RELASZ
, 0)
3712 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3715 /* If any dynamic relocs apply to a read-only section,
3716 then we need a DT_TEXTREL entry. */
3717 if ((info
->flags
& DF_TEXTREL
) == 0)
3718 elf_link_hash_traverse (&htab
->elf
,
3719 elf_x86_64_readonly_dynrelocs
,
3722 if ((info
->flags
& DF_TEXTREL
) != 0)
3724 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3725 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3727 info
->callbacks
->einfo
3728 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3729 bfd_set_error (bfd_error_bad_value
);
3733 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3738 #undef add_dynamic_entry
3744 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3745 struct bfd_link_info
*info
)
3747 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3751 struct elf_link_hash_entry
*tlsbase
;
3753 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3754 "_TLS_MODULE_BASE_",
3755 FALSE
, FALSE
, FALSE
);
3757 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3759 struct elf_x86_64_link_hash_table
*htab
;
3760 struct bfd_link_hash_entry
*bh
= NULL
;
3761 const struct elf_backend_data
*bed
3762 = get_elf_backend_data (output_bfd
);
3764 htab
= elf_x86_64_hash_table (info
);
3768 if (!(_bfd_generic_link_add_one_symbol
3769 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3770 tls_sec
, 0, NULL
, FALSE
,
3771 bed
->collect
, &bh
)))
3774 htab
->tls_module_base
= bh
;
3776 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3777 tlsbase
->def_regular
= 1;
3778 tlsbase
->other
= STV_HIDDEN
;
3779 tlsbase
->root
.linker_def
= 1;
3780 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3787 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3788 executables. Rather than setting it to the beginning of the TLS
3789 section, we have to set it to the end. This function may be called
3790 multiple times, it is idempotent. */
3793 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3795 struct elf_x86_64_link_hash_table
*htab
;
3796 struct bfd_link_hash_entry
*base
;
3798 if (!bfd_link_executable (info
))
3801 htab
= elf_x86_64_hash_table (info
);
3805 base
= htab
->tls_module_base
;
3809 base
->u
.def
.value
= htab
->elf
.tls_size
;
3812 /* Return the base VMA address which should be subtracted from real addresses
3813 when resolving @dtpoff relocation.
3814 This is PT_TLS segment p_vaddr. */
3817 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3819 /* If tls_sec is NULL, we should have signalled an error already. */
3820 if (elf_hash_table (info
)->tls_sec
== NULL
)
3822 return elf_hash_table (info
)->tls_sec
->vma
;
3825 /* Return the relocation value for @tpoff relocation
3826 if STT_TLS virtual address is ADDRESS. */
3829 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3831 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3832 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3833 bfd_vma static_tls_size
;
3835 /* If tls_segment is NULL, we should have signalled an error already. */
3836 if (htab
->tls_sec
== NULL
)
3839 /* Consider special static TLS alignment requirements. */
3840 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3841 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3844 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3848 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3850 /* Opcode Instruction
3853 0x0f 0x8x conditional jump */
3855 && (contents
[offset
- 1] == 0xe8
3856 || contents
[offset
- 1] == 0xe9))
3858 && contents
[offset
- 2] == 0x0f
3859 && (contents
[offset
- 1] & 0xf0) == 0x80));
3862 /* Relocate an x86_64 ELF section. */
3865 elf_x86_64_relocate_section (bfd
*output_bfd
,
3866 struct bfd_link_info
*info
,
3868 asection
*input_section
,
3870 Elf_Internal_Rela
*relocs
,
3871 Elf_Internal_Sym
*local_syms
,
3872 asection
**local_sections
)
3874 struct elf_x86_64_link_hash_table
*htab
;
3875 Elf_Internal_Shdr
*symtab_hdr
;
3876 struct elf_link_hash_entry
**sym_hashes
;
3877 bfd_vma
*local_got_offsets
;
3878 bfd_vma
*local_tlsdesc_gotents
;
3879 Elf_Internal_Rela
*rel
;
3880 Elf_Internal_Rela
*wrel
;
3881 Elf_Internal_Rela
*relend
;
3882 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3884 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3886 htab
= elf_x86_64_hash_table (info
);
3889 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3890 sym_hashes
= elf_sym_hashes (input_bfd
);
3891 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3892 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3894 elf_x86_64_set_tls_module_base (info
);
3896 rel
= wrel
= relocs
;
3897 relend
= relocs
+ input_section
->reloc_count
;
3898 for (; rel
< relend
; wrel
++, rel
++)
3900 unsigned int r_type
;
3901 reloc_howto_type
*howto
;
3902 unsigned long r_symndx
;
3903 struct elf_link_hash_entry
*h
;
3904 struct elf_x86_64_link_hash_entry
*eh
;
3905 Elf_Internal_Sym
*sym
;
3907 bfd_vma off
, offplt
, plt_offset
;
3909 bfd_boolean unresolved_reloc
;
3910 bfd_reloc_status_type r
;
3912 asection
*base_got
, *resolved_plt
;
3915 r_type
= ELF32_R_TYPE (rel
->r_info
);
3916 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3917 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3924 if (r_type
>= (int) R_X86_64_standard
)
3926 (*_bfd_error_handler
)
3927 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3928 input_bfd
, input_section
, r_type
);
3929 bfd_set_error (bfd_error_bad_value
);
3933 if (r_type
!= (int) R_X86_64_32
3934 || ABI_64_P (output_bfd
))
3935 howto
= x86_64_elf_howto_table
+ r_type
;
3937 howto
= (x86_64_elf_howto_table
3938 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3939 r_symndx
= htab
->r_sym (rel
->r_info
);
3943 unresolved_reloc
= FALSE
;
3944 if (r_symndx
< symtab_hdr
->sh_info
)
3946 sym
= local_syms
+ r_symndx
;
3947 sec
= local_sections
[r_symndx
];
3949 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3951 st_size
= sym
->st_size
;
3953 /* Relocate against local STT_GNU_IFUNC symbol. */
3954 if (!bfd_link_relocatable (info
)
3955 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3957 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3962 /* Set STT_GNU_IFUNC symbol value. */
3963 h
->root
.u
.def
.value
= sym
->st_value
;
3964 h
->root
.u
.def
.section
= sec
;
3969 bfd_boolean warned ATTRIBUTE_UNUSED
;
3970 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3972 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3973 r_symndx
, symtab_hdr
, sym_hashes
,
3975 unresolved_reloc
, warned
, ignored
);
3979 if (sec
!= NULL
&& discarded_section (sec
))
3981 _bfd_clear_contents (howto
, input_bfd
, input_section
,
3982 contents
+ rel
->r_offset
);
3983 wrel
->r_offset
= rel
->r_offset
;
3987 /* For ld -r, remove relocations in debug sections against
3988 sections defined in discarded sections. Not done for
3989 eh_frame editing code expects to be present. */
3990 if (bfd_link_relocatable (info
)
3991 && (input_section
->flags
& SEC_DEBUGGING
))
3997 if (bfd_link_relocatable (info
))
4004 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
4006 if (r_type
== R_X86_64_64
)
4008 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4009 zero-extend it to 64bit if addend is zero. */
4010 r_type
= R_X86_64_32
;
4011 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4013 else if (r_type
== R_X86_64_SIZE64
)
4015 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4016 zero-extend it to 64bit if addend is zero. */
4017 r_type
= R_X86_64_SIZE32
;
4018 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4022 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
4024 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4025 it here if it is defined in a non-shared object. */
4027 && h
->type
== STT_GNU_IFUNC
4033 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4035 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4036 sections because such sections are not SEC_ALLOC and
4037 thus ld.so will not process them. */
4038 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
4042 else if (h
->plt
.offset
== (bfd_vma
) -1)
4045 /* STT_GNU_IFUNC symbol must go through PLT. */
4046 if (htab
->elf
.splt
!= NULL
)
4048 if (htab
->plt_bnd
!= NULL
)
4050 resolved_plt
= htab
->plt_bnd
;
4051 plt_offset
= eh
->plt_bnd
.offset
;
4055 resolved_plt
= htab
->elf
.splt
;
4056 plt_offset
= h
->plt
.offset
;
4061 resolved_plt
= htab
->elf
.iplt
;
4062 plt_offset
= h
->plt
.offset
;
4065 relocation
= (resolved_plt
->output_section
->vma
4066 + resolved_plt
->output_offset
+ plt_offset
);
4071 if (h
->root
.root
.string
)
4072 name
= h
->root
.root
.string
;
4074 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4076 (*_bfd_error_handler
)
4077 (_("%B: relocation %s against STT_GNU_IFUNC "
4078 "symbol `%s' isn't handled by %s"), input_bfd
,
4079 x86_64_elf_howto_table
[r_type
].name
,
4080 name
, __FUNCTION__
);
4081 bfd_set_error (bfd_error_bad_value
);
4085 if (bfd_link_pic (info
))
4090 if (ABI_64_P (output_bfd
))
4094 if (rel
->r_addend
!= 0)
4096 if (h
->root
.root
.string
)
4097 name
= h
->root
.root
.string
;
4099 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4101 (*_bfd_error_handler
)
4102 (_("%B: relocation %s against STT_GNU_IFUNC "
4103 "symbol `%s' has non-zero addend: %d"),
4104 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
4105 name
, rel
->r_addend
);
4106 bfd_set_error (bfd_error_bad_value
);
4110 /* Generate dynamic relcoation only when there is a
4111 non-GOT reference in a shared object. */
4112 if (bfd_link_pic (info
) && h
->non_got_ref
)
4114 Elf_Internal_Rela outrel
;
4117 /* Need a dynamic relocation to get the real function
4119 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
4123 if (outrel
.r_offset
== (bfd_vma
) -1
4124 || outrel
.r_offset
== (bfd_vma
) -2)
4127 outrel
.r_offset
+= (input_section
->output_section
->vma
4128 + input_section
->output_offset
);
4130 if (h
->dynindx
== -1
4132 || bfd_link_executable (info
))
4134 /* This symbol is resolved locally. */
4135 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4136 outrel
.r_addend
= (h
->root
.u
.def
.value
4137 + h
->root
.u
.def
.section
->output_section
->vma
4138 + h
->root
.u
.def
.section
->output_offset
);
4142 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4143 outrel
.r_addend
= 0;
4146 sreloc
= htab
->elf
.irelifunc
;
4147 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4149 /* If this reloc is against an external symbol, we
4150 do not want to fiddle with the addend. Otherwise,
4151 we need to include the symbol value so that it
4152 becomes an addend for the dynamic reloc. For an
4153 internal symbol, we have updated addend. */
4158 case R_X86_64_PC32_BND
:
4160 case R_X86_64_PLT32
:
4161 case R_X86_64_PLT32_BND
:
4164 case R_X86_64_GOTPCREL
:
4165 case R_X86_64_GOTPCRELX
:
4166 case R_X86_64_REX_GOTPCRELX
:
4167 case R_X86_64_GOTPCREL64
:
4168 base_got
= htab
->elf
.sgot
;
4169 off
= h
->got
.offset
;
4171 if (base_got
== NULL
)
4174 if (off
== (bfd_vma
) -1)
4176 /* We can't use h->got.offset here to save state, or
4177 even just remember the offset, as finish_dynamic_symbol
4178 would use that as offset into .got. */
4180 if (htab
->elf
.splt
!= NULL
)
4182 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4183 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4184 base_got
= htab
->elf
.sgotplt
;
4188 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4189 off
= plt_index
* GOT_ENTRY_SIZE
;
4190 base_got
= htab
->elf
.igotplt
;
4193 if (h
->dynindx
== -1
4197 /* This references the local defitionion. We must
4198 initialize this entry in the global offset table.
4199 Since the offset must always be a multiple of 8,
4200 we use the least significant bit to record
4201 whether we have initialized it already.
4203 When doing a dynamic link, we create a .rela.got
4204 relocation entry to initialize the value. This
4205 is done in the finish_dynamic_symbol routine. */
4210 bfd_put_64 (output_bfd
, relocation
,
4211 base_got
->contents
+ off
);
4212 /* Note that this is harmless for the GOTPLT64
4213 case, as -1 | 1 still is -1. */
4219 relocation
= (base_got
->output_section
->vma
4220 + base_got
->output_offset
+ off
);
4226 /* When generating a shared object, the relocations handled here are
4227 copied into the output file to be resolved at run time. */
4230 case R_X86_64_GOT32
:
4231 case R_X86_64_GOT64
:
4232 /* Relocation is to the entry for this symbol in the global
4234 case R_X86_64_GOTPCREL
:
4235 case R_X86_64_GOTPCRELX
:
4236 case R_X86_64_REX_GOTPCRELX
:
4237 case R_X86_64_GOTPCREL64
:
4238 /* Use global offset table entry as symbol value. */
4239 case R_X86_64_GOTPLT64
:
4240 /* This is obsolete and treated the the same as GOT64. */
4241 base_got
= htab
->elf
.sgot
;
4243 if (htab
->elf
.sgot
== NULL
)
4250 off
= h
->got
.offset
;
4252 && h
->plt
.offset
!= (bfd_vma
)-1
4253 && off
== (bfd_vma
)-1)
4255 /* We can't use h->got.offset here to save
4256 state, or even just remember the offset, as
4257 finish_dynamic_symbol would use that as offset into
4259 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4260 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4261 base_got
= htab
->elf
.sgotplt
;
4264 dyn
= htab
->elf
.dynamic_sections_created
;
4266 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4267 || (bfd_link_pic (info
)
4268 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4269 || (ELF_ST_VISIBILITY (h
->other
)
4270 && h
->root
.type
== bfd_link_hash_undefweak
))
4272 /* This is actually a static link, or it is a -Bsymbolic
4273 link and the symbol is defined locally, or the symbol
4274 was forced to be local because of a version file. We
4275 must initialize this entry in the global offset table.
4276 Since the offset must always be a multiple of 8, we
4277 use the least significant bit to record whether we
4278 have initialized it already.
4280 When doing a dynamic link, we create a .rela.got
4281 relocation entry to initialize the value. This is
4282 done in the finish_dynamic_symbol routine. */
4287 bfd_put_64 (output_bfd
, relocation
,
4288 base_got
->contents
+ off
);
4289 /* Note that this is harmless for the GOTPLT64 case,
4290 as -1 | 1 still is -1. */
4295 unresolved_reloc
= FALSE
;
4299 if (local_got_offsets
== NULL
)
4302 off
= local_got_offsets
[r_symndx
];
4304 /* The offset must always be a multiple of 8. We use
4305 the least significant bit to record whether we have
4306 already generated the necessary reloc. */
4311 bfd_put_64 (output_bfd
, relocation
,
4312 base_got
->contents
+ off
);
4314 if (bfd_link_pic (info
))
4317 Elf_Internal_Rela outrel
;
4319 /* We need to generate a R_X86_64_RELATIVE reloc
4320 for the dynamic linker. */
4321 s
= htab
->elf
.srelgot
;
4325 outrel
.r_offset
= (base_got
->output_section
->vma
4326 + base_got
->output_offset
4328 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4329 outrel
.r_addend
= relocation
;
4330 elf_append_rela (output_bfd
, s
, &outrel
);
4333 local_got_offsets
[r_symndx
] |= 1;
4337 if (off
>= (bfd_vma
) -2)
4340 relocation
= base_got
->output_section
->vma
4341 + base_got
->output_offset
+ off
;
4342 if (r_type
!= R_X86_64_GOTPCREL
4343 && r_type
!= R_X86_64_GOTPCRELX
4344 && r_type
!= R_X86_64_REX_GOTPCRELX
4345 && r_type
!= R_X86_64_GOTPCREL64
)
4346 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4347 - htab
->elf
.sgotplt
->output_offset
;
4351 case R_X86_64_GOTOFF64
:
4352 /* Relocation is relative to the start of the global offset
4355 /* Check to make sure it isn't a protected function or data
4356 symbol for shared library since it may not be local when
4357 used as function address or with copy relocation. We also
4358 need to make sure that a symbol is referenced locally. */
4359 if (bfd_link_pic (info
) && h
)
4361 if (!h
->def_regular
)
4365 switch (ELF_ST_VISIBILITY (h
->other
))
4368 v
= _("hidden symbol");
4371 v
= _("internal symbol");
4374 v
= _("protected symbol");
4381 (*_bfd_error_handler
)
4382 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4383 input_bfd
, v
, h
->root
.root
.string
);
4384 bfd_set_error (bfd_error_bad_value
);
4387 else if (!bfd_link_executable (info
)
4388 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4389 && (h
->type
== STT_FUNC
4390 || h
->type
== STT_OBJECT
)
4391 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4393 (*_bfd_error_handler
)
4394 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4396 h
->type
== STT_FUNC
? "function" : "data",
4397 h
->root
.root
.string
);
4398 bfd_set_error (bfd_error_bad_value
);
4403 /* Note that sgot is not involved in this
4404 calculation. We always want the start of .got.plt. If we
4405 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4406 permitted by the ABI, we might have to change this
4408 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4409 + htab
->elf
.sgotplt
->output_offset
;
4412 case R_X86_64_GOTPC32
:
4413 case R_X86_64_GOTPC64
:
4414 /* Use global offset table as symbol value. */
4415 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4416 + htab
->elf
.sgotplt
->output_offset
;
4417 unresolved_reloc
= FALSE
;
4420 case R_X86_64_PLTOFF64
:
4421 /* Relocation is PLT entry relative to GOT. For local
4422 symbols it's the symbol itself relative to GOT. */
4424 /* See PLT32 handling. */
4425 && h
->plt
.offset
!= (bfd_vma
) -1
4426 && htab
->elf
.splt
!= NULL
)
4428 if (htab
->plt_bnd
!= NULL
)
4430 resolved_plt
= htab
->plt_bnd
;
4431 plt_offset
= eh
->plt_bnd
.offset
;
4435 resolved_plt
= htab
->elf
.splt
;
4436 plt_offset
= h
->plt
.offset
;
4439 relocation
= (resolved_plt
->output_section
->vma
4440 + resolved_plt
->output_offset
4442 unresolved_reloc
= FALSE
;
4445 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4446 + htab
->elf
.sgotplt
->output_offset
;
4449 case R_X86_64_PLT32
:
4450 case R_X86_64_PLT32_BND
:
4451 /* Relocation is to the entry for this symbol in the
4452 procedure linkage table. */
4454 /* Resolve a PLT32 reloc against a local symbol directly,
4455 without using the procedure linkage table. */
4459 if ((h
->plt
.offset
== (bfd_vma
) -1
4460 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4461 || htab
->elf
.splt
== NULL
)
4463 /* We didn't make a PLT entry for this symbol. This
4464 happens when statically linking PIC code, or when
4465 using -Bsymbolic. */
4469 if (h
->plt
.offset
!= (bfd_vma
) -1)
4471 if (htab
->plt_bnd
!= NULL
)
4473 resolved_plt
= htab
->plt_bnd
;
4474 plt_offset
= eh
->plt_bnd
.offset
;
4478 resolved_plt
= htab
->elf
.splt
;
4479 plt_offset
= h
->plt
.offset
;
4484 /* Use the GOT PLT. */
4485 resolved_plt
= htab
->plt_got
;
4486 plt_offset
= eh
->plt_got
.offset
;
4489 relocation
= (resolved_plt
->output_section
->vma
4490 + resolved_plt
->output_offset
4492 unresolved_reloc
= FALSE
;
4495 case R_X86_64_SIZE32
:
4496 case R_X86_64_SIZE64
:
4497 /* Set to symbol size. */
4498 relocation
= st_size
;
4504 case R_X86_64_PC32_BND
:
4505 /* Don't complain about -fPIC if the symbol is undefined when
4506 building executable. */
4507 if (bfd_link_pic (info
)
4508 && (input_section
->flags
& SEC_ALLOC
) != 0
4509 && (input_section
->flags
& SEC_READONLY
) != 0
4511 && !(bfd_link_executable (info
)
4512 && h
->root
.type
== bfd_link_hash_undefined
))
4514 bfd_boolean fail
= FALSE
;
4516 = ((r_type
== R_X86_64_PC32
4517 || r_type
== R_X86_64_PC32_BND
)
4518 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4520 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4522 /* Symbol is referenced locally. Make sure it is
4523 defined locally or for a branch. */
4524 fail
= !h
->def_regular
&& !branch
;
4526 else if (!(bfd_link_executable (info
)
4527 && (h
->needs_copy
|| eh
->needs_copy
)))
4529 /* Symbol doesn't need copy reloc and isn't referenced
4530 locally. We only allow branch to symbol with
4531 non-default visibility. */
4533 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4540 const char *pic
= "";
4542 switch (ELF_ST_VISIBILITY (h
->other
))
4545 v
= _("hidden symbol");
4548 v
= _("internal symbol");
4551 v
= _("protected symbol");
4555 pic
= _("; recompile with -fPIC");
4560 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4562 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4564 (*_bfd_error_handler
) (fmt
, input_bfd
,
4565 x86_64_elf_howto_table
[r_type
].name
,
4566 v
, h
->root
.root
.string
, pic
);
4567 bfd_set_error (bfd_error_bad_value
);
4578 /* FIXME: The ABI says the linker should make sure the value is
4579 the same when it's zeroextended to 64 bit. */
4582 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4585 /* Don't copy a pc-relative relocation into the output file
4586 if the symbol needs copy reloc or the symbol is undefined
4587 when building executable. Copy dynamic function pointer
4589 if ((bfd_link_pic (info
)
4590 && !(bfd_link_executable (info
)
4594 || h
->root
.type
== bfd_link_hash_undefined
)
4595 && IS_X86_64_PCREL_TYPE (r_type
))
4597 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4598 || h
->root
.type
!= bfd_link_hash_undefweak
)
4599 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4600 && r_type
!= R_X86_64_SIZE32
4601 && r_type
!= R_X86_64_SIZE64
)
4602 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4603 || (ELIMINATE_COPY_RELOCS
4604 && !bfd_link_pic (info
)
4607 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4610 || h
->root
.type
== bfd_link_hash_undefweak
4611 || h
->root
.type
== bfd_link_hash_undefined
)))
4613 Elf_Internal_Rela outrel
;
4614 bfd_boolean skip
, relocate
;
4617 /* When generating a shared object, these relocations
4618 are copied into the output file to be resolved at run
4624 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4626 if (outrel
.r_offset
== (bfd_vma
) -1)
4628 else if (outrel
.r_offset
== (bfd_vma
) -2)
4629 skip
= TRUE
, relocate
= TRUE
;
4631 outrel
.r_offset
+= (input_section
->output_section
->vma
4632 + input_section
->output_offset
);
4635 memset (&outrel
, 0, sizeof outrel
);
4637 /* h->dynindx may be -1 if this symbol was marked to
4641 && (IS_X86_64_PCREL_TYPE (r_type
)
4642 || ! bfd_link_pic (info
)
4643 || ! SYMBOLIC_BIND (info
, h
)
4644 || ! h
->def_regular
))
4646 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4647 outrel
.r_addend
= rel
->r_addend
;
4651 /* This symbol is local, or marked to become local. */
4652 if (r_type
== htab
->pointer_r_type
)
4655 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4656 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4658 else if (r_type
== R_X86_64_64
4659 && !ABI_64_P (output_bfd
))
4662 outrel
.r_info
= htab
->r_info (0,
4663 R_X86_64_RELATIVE64
);
4664 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4665 /* Check addend overflow. */
4666 if ((outrel
.r_addend
& 0x80000000)
4667 != (rel
->r_addend
& 0x80000000))
4670 int addend
= rel
->r_addend
;
4671 if (h
&& h
->root
.root
.string
)
4672 name
= h
->root
.root
.string
;
4674 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4677 (*_bfd_error_handler
)
4678 (_("%B: addend -0x%x in relocation %s against "
4679 "symbol `%s' at 0x%lx in section `%A' is "
4681 input_bfd
, input_section
, addend
,
4682 x86_64_elf_howto_table
[r_type
].name
,
4683 name
, (unsigned long) rel
->r_offset
);
4685 (*_bfd_error_handler
)
4686 (_("%B: addend 0x%x in relocation %s against "
4687 "symbol `%s' at 0x%lx in section `%A' is "
4689 input_bfd
, input_section
, addend
,
4690 x86_64_elf_howto_table
[r_type
].name
,
4691 name
, (unsigned long) rel
->r_offset
);
4692 bfd_set_error (bfd_error_bad_value
);
4700 if (bfd_is_abs_section (sec
))
4702 else if (sec
== NULL
|| sec
->owner
== NULL
)
4704 bfd_set_error (bfd_error_bad_value
);
4711 /* We are turning this relocation into one
4712 against a section symbol. It would be
4713 proper to subtract the symbol's value,
4714 osec->vma, from the emitted reloc addend,
4715 but ld.so expects buggy relocs. */
4716 osec
= sec
->output_section
;
4717 sindx
= elf_section_data (osec
)->dynindx
;
4720 asection
*oi
= htab
->elf
.text_index_section
;
4721 sindx
= elf_section_data (oi
)->dynindx
;
4723 BFD_ASSERT (sindx
!= 0);
4726 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4727 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4731 sreloc
= elf_section_data (input_section
)->sreloc
;
4733 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4735 r
= bfd_reloc_notsupported
;
4736 goto check_relocation_error
;
4739 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4741 /* If this reloc is against an external symbol, we do
4742 not want to fiddle with the addend. Otherwise, we
4743 need to include the symbol value so that it becomes
4744 an addend for the dynamic reloc. */
4751 case R_X86_64_TLSGD
:
4752 case R_X86_64_GOTPC32_TLSDESC
:
4753 case R_X86_64_TLSDESC_CALL
:
4754 case R_X86_64_GOTTPOFF
:
4755 tls_type
= GOT_UNKNOWN
;
4756 if (h
== NULL
&& local_got_offsets
)
4757 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4759 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4761 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4762 input_section
, contents
,
4763 symtab_hdr
, sym_hashes
,
4764 &r_type
, tls_type
, rel
,
4765 relend
, h
, r_symndx
))
4768 if (r_type
== R_X86_64_TPOFF32
)
4770 bfd_vma roff
= rel
->r_offset
;
4772 BFD_ASSERT (! unresolved_reloc
);
4774 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4776 /* GD->LE transition. For 64bit, change
4777 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4778 .word 0x6666; rex64; call __tls_get_addr
4781 leaq foo@tpoff(%rax), %rax
4783 leaq foo@tlsgd(%rip), %rdi
4784 .word 0x6666; rex64; call __tls_get_addr
4787 leaq foo@tpoff(%rax), %rax
4788 For largepic, change:
4789 leaq foo@tlsgd(%rip), %rdi
4790 movabsq $__tls_get_addr@pltoff, %rax
4795 leaq foo@tpoff(%rax), %rax
4796 nopw 0x0(%rax,%rax,1) */
4798 if (ABI_64_P (output_bfd
)
4799 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4801 memcpy (contents
+ roff
- 3,
4802 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4803 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4806 else if (ABI_64_P (output_bfd
))
4807 memcpy (contents
+ roff
- 4,
4808 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4811 memcpy (contents
+ roff
- 3,
4812 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4814 bfd_put_32 (output_bfd
,
4815 elf_x86_64_tpoff (info
, relocation
),
4816 contents
+ roff
+ 8 + largepic
);
4817 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4822 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4824 /* GDesc -> LE transition.
4825 It's originally something like:
4826 leaq x@tlsdesc(%rip), %rax
4829 movl $x@tpoff, %rax. */
4831 unsigned int val
, type
;
4833 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4834 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4835 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4836 contents
+ roff
- 3);
4837 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4838 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4839 contents
+ roff
- 1);
4840 bfd_put_32 (output_bfd
,
4841 elf_x86_64_tpoff (info
, relocation
),
4845 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4847 /* GDesc -> LE transition.
4852 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4853 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4856 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4858 /* IE->LE transition:
4859 For 64bit, originally it can be one of:
4860 movq foo@gottpoff(%rip), %reg
4861 addq foo@gottpoff(%rip), %reg
4864 leaq foo(%reg), %reg
4866 For 32bit, originally it can be one of:
4867 movq foo@gottpoff(%rip), %reg
4868 addl foo@gottpoff(%rip), %reg
4871 leal foo(%reg), %reg
4874 unsigned int val
, type
, reg
;
4877 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4880 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4881 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4887 bfd_put_8 (output_bfd
, 0x49,
4888 contents
+ roff
- 3);
4889 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4890 bfd_put_8 (output_bfd
, 0x41,
4891 contents
+ roff
- 3);
4892 bfd_put_8 (output_bfd
, 0xc7,
4893 contents
+ roff
- 2);
4894 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4895 contents
+ roff
- 1);
4899 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4902 bfd_put_8 (output_bfd
, 0x49,
4903 contents
+ roff
- 3);
4904 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4905 bfd_put_8 (output_bfd
, 0x41,
4906 contents
+ roff
- 3);
4907 bfd_put_8 (output_bfd
, 0x81,
4908 contents
+ roff
- 2);
4909 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4910 contents
+ roff
- 1);
4914 /* addq/addl -> leaq/leal */
4916 bfd_put_8 (output_bfd
, 0x4d,
4917 contents
+ roff
- 3);
4918 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4919 bfd_put_8 (output_bfd
, 0x45,
4920 contents
+ roff
- 3);
4921 bfd_put_8 (output_bfd
, 0x8d,
4922 contents
+ roff
- 2);
4923 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4924 contents
+ roff
- 1);
4926 bfd_put_32 (output_bfd
,
4927 elf_x86_64_tpoff (info
, relocation
),
4935 if (htab
->elf
.sgot
== NULL
)
4940 off
= h
->got
.offset
;
4941 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4945 if (local_got_offsets
== NULL
)
4948 off
= local_got_offsets
[r_symndx
];
4949 offplt
= local_tlsdesc_gotents
[r_symndx
];
4956 Elf_Internal_Rela outrel
;
4960 if (htab
->elf
.srelgot
== NULL
)
4963 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4965 if (GOT_TLS_GDESC_P (tls_type
))
4967 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4968 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4969 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4970 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4971 + htab
->elf
.sgotplt
->output_offset
4973 + htab
->sgotplt_jump_table_size
);
4974 sreloc
= htab
->elf
.srelplt
;
4976 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4978 outrel
.r_addend
= 0;
4979 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4982 sreloc
= htab
->elf
.srelgot
;
4984 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4985 + htab
->elf
.sgot
->output_offset
+ off
);
4987 if (GOT_TLS_GD_P (tls_type
))
4988 dr_type
= R_X86_64_DTPMOD64
;
4989 else if (GOT_TLS_GDESC_P (tls_type
))
4992 dr_type
= R_X86_64_TPOFF64
;
4994 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4995 outrel
.r_addend
= 0;
4996 if ((dr_type
== R_X86_64_TPOFF64
4997 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4998 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4999 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
5001 elf_append_rela (output_bfd
, sreloc
, &outrel
);
5003 if (GOT_TLS_GD_P (tls_type
))
5007 BFD_ASSERT (! unresolved_reloc
);
5008 bfd_put_64 (output_bfd
,
5009 relocation
- elf_x86_64_dtpoff_base (info
),
5010 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5014 bfd_put_64 (output_bfd
, 0,
5015 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5016 outrel
.r_info
= htab
->r_info (indx
,
5018 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
5019 elf_append_rela (output_bfd
, sreloc
,
5028 local_got_offsets
[r_symndx
] |= 1;
5031 if (off
>= (bfd_vma
) -2
5032 && ! GOT_TLS_GDESC_P (tls_type
))
5034 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
5036 if (r_type
== R_X86_64_GOTPC32_TLSDESC
5037 || r_type
== R_X86_64_TLSDESC_CALL
)
5038 relocation
= htab
->elf
.sgotplt
->output_section
->vma
5039 + htab
->elf
.sgotplt
->output_offset
5040 + offplt
+ htab
->sgotplt_jump_table_size
;
5042 relocation
= htab
->elf
.sgot
->output_section
->vma
5043 + htab
->elf
.sgot
->output_offset
+ off
;
5044 unresolved_reloc
= FALSE
;
5048 bfd_vma roff
= rel
->r_offset
;
5050 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5052 /* GD->IE transition. For 64bit, change
5053 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5054 .word 0x6666; rex64; call __tls_get_addr@plt
5057 addq foo@gottpoff(%rip), %rax
5059 leaq foo@tlsgd(%rip), %rdi
5060 .word 0x6666; rex64; call __tls_get_addr@plt
5063 addq foo@gottpoff(%rip), %rax
5064 For largepic, change:
5065 leaq foo@tlsgd(%rip), %rdi
5066 movabsq $__tls_get_addr@pltoff, %rax
5071 addq foo@gottpoff(%rax), %rax
5072 nopw 0x0(%rax,%rax,1) */
5074 if (ABI_64_P (output_bfd
)
5075 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
5077 memcpy (contents
+ roff
- 3,
5078 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5079 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5082 else if (ABI_64_P (output_bfd
))
5083 memcpy (contents
+ roff
- 4,
5084 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5087 memcpy (contents
+ roff
- 3,
5088 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5091 relocation
= (htab
->elf
.sgot
->output_section
->vma
5092 + htab
->elf
.sgot
->output_offset
+ off
5095 - input_section
->output_section
->vma
5096 - input_section
->output_offset
5098 bfd_put_32 (output_bfd
, relocation
,
5099 contents
+ roff
+ 8 + largepic
);
5100 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5105 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5107 /* GDesc -> IE transition.
5108 It's originally something like:
5109 leaq x@tlsdesc(%rip), %rax
5112 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5114 /* Now modify the instruction as appropriate. To
5115 turn a leaq into a movq in the form we use it, it
5116 suffices to change the second byte from 0x8d to
5118 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
5120 bfd_put_32 (output_bfd
,
5121 htab
->elf
.sgot
->output_section
->vma
5122 + htab
->elf
.sgot
->output_offset
+ off
5124 - input_section
->output_section
->vma
5125 - input_section
->output_offset
5130 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5132 /* GDesc -> IE transition.
5139 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5140 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5148 case R_X86_64_TLSLD
:
5149 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5150 input_section
, contents
,
5151 symtab_hdr
, sym_hashes
,
5152 &r_type
, GOT_UNKNOWN
,
5153 rel
, relend
, h
, r_symndx
))
5156 if (r_type
!= R_X86_64_TLSLD
)
5158 /* LD->LE transition:
5159 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
5160 For 64bit, we change it into:
5161 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
5162 For 32bit, we change it into:
5163 nopl 0x0(%rax); movl %fs:0, %eax.
5164 For largepic, change:
5165 leaq foo@tlsgd(%rip), %rdi
5166 movabsq $__tls_get_addr@pltoff, %rax
5170 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
5173 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
5174 if (ABI_64_P (output_bfd
)
5175 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
5176 memcpy (contents
+ rel
->r_offset
- 3,
5177 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5178 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5179 else if (ABI_64_P (output_bfd
))
5180 memcpy (contents
+ rel
->r_offset
- 3,
5181 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5183 memcpy (contents
+ rel
->r_offset
- 3,
5184 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5185 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5191 if (htab
->elf
.sgot
== NULL
)
5194 off
= htab
->tls_ld_got
.offset
;
5199 Elf_Internal_Rela outrel
;
5201 if (htab
->elf
.srelgot
== NULL
)
5204 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5205 + htab
->elf
.sgot
->output_offset
+ off
);
5207 bfd_put_64 (output_bfd
, 0,
5208 htab
->elf
.sgot
->contents
+ off
);
5209 bfd_put_64 (output_bfd
, 0,
5210 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5211 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5212 outrel
.r_addend
= 0;
5213 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5215 htab
->tls_ld_got
.offset
|= 1;
5217 relocation
= htab
->elf
.sgot
->output_section
->vma
5218 + htab
->elf
.sgot
->output_offset
+ off
;
5219 unresolved_reloc
= FALSE
;
5222 case R_X86_64_DTPOFF32
:
5223 if (!bfd_link_executable (info
)
5224 || (input_section
->flags
& SEC_CODE
) == 0)
5225 relocation
-= elf_x86_64_dtpoff_base (info
);
5227 relocation
= elf_x86_64_tpoff (info
, relocation
);
5230 case R_X86_64_TPOFF32
:
5231 case R_X86_64_TPOFF64
:
5232 BFD_ASSERT (bfd_link_executable (info
));
5233 relocation
= elf_x86_64_tpoff (info
, relocation
);
5236 case R_X86_64_DTPOFF64
:
5237 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5238 relocation
-= elf_x86_64_dtpoff_base (info
);
5245 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5246 because such sections are not SEC_ALLOC and thus ld.so will
5247 not process them. */
5248 if (unresolved_reloc
5249 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5251 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5252 rel
->r_offset
) != (bfd_vma
) -1)
5254 (*_bfd_error_handler
)
5255 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5258 (long) rel
->r_offset
,
5260 h
->root
.root
.string
);
5265 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5266 contents
, rel
->r_offset
,
5267 relocation
, rel
->r_addend
);
5269 check_relocation_error
:
5270 if (r
!= bfd_reloc_ok
)
5275 name
= h
->root
.root
.string
;
5278 name
= bfd_elf_string_from_elf_section (input_bfd
,
5279 symtab_hdr
->sh_link
,
5284 name
= bfd_section_name (input_bfd
, sec
);
5287 if (r
== bfd_reloc_overflow
)
5289 if (! ((*info
->callbacks
->reloc_overflow
)
5290 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5291 (bfd_vma
) 0, input_bfd
, input_section
,
5297 (*_bfd_error_handler
)
5298 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5299 input_bfd
, input_section
,
5300 (long) rel
->r_offset
, name
, (int) r
);
5311 Elf_Internal_Shdr
*rel_hdr
;
5312 size_t deleted
= rel
- wrel
;
5314 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
5315 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5316 if (rel_hdr
->sh_size
== 0)
5318 /* It is too late to remove an empty reloc section. Leave
5320 ??? What is wrong with an empty section??? */
5321 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
5324 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
5325 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5326 input_section
->reloc_count
-= deleted
;
5332 /* Finish up dynamic symbol handling. We set the contents of various
5333 dynamic sections here. */
5336 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5337 struct bfd_link_info
*info
,
5338 struct elf_link_hash_entry
*h
,
5339 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5341 struct elf_x86_64_link_hash_table
*htab
;
5342 const struct elf_x86_64_backend_data
*abed
;
5343 bfd_boolean use_plt_bnd
;
5344 struct elf_x86_64_link_hash_entry
*eh
;
5346 htab
= elf_x86_64_hash_table (info
);
5350 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5351 section only if there is .plt section. */
5352 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5354 ? &elf_x86_64_bnd_arch_bed
5355 : get_elf_x86_64_backend_data (output_bfd
));
5357 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5359 if (h
->plt
.offset
!= (bfd_vma
) -1)
5362 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5363 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5364 Elf_Internal_Rela rela
;
5366 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5367 const struct elf_backend_data
*bed
;
5368 bfd_vma plt_got_pcrel_offset
;
5370 /* When building a static executable, use .iplt, .igot.plt and
5371 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5372 if (htab
->elf
.splt
!= NULL
)
5374 plt
= htab
->elf
.splt
;
5375 gotplt
= htab
->elf
.sgotplt
;
5376 relplt
= htab
->elf
.srelplt
;
5380 plt
= htab
->elf
.iplt
;
5381 gotplt
= htab
->elf
.igotplt
;
5382 relplt
= htab
->elf
.irelplt
;
5385 /* This symbol has an entry in the procedure linkage table. Set
5387 if ((h
->dynindx
== -1
5388 && !((h
->forced_local
|| bfd_link_executable (info
))
5390 && h
->type
== STT_GNU_IFUNC
))
5396 /* Get the index in the procedure linkage table which
5397 corresponds to this symbol. This is the index of this symbol
5398 in all the symbols for which we are making plt entries. The
5399 first entry in the procedure linkage table is reserved.
5401 Get the offset into the .got table of the entry that
5402 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5403 bytes. The first three are reserved for the dynamic linker.
5405 For static executables, we don't reserve anything. */
5407 if (plt
== htab
->elf
.splt
)
5409 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5410 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5414 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5415 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5418 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5419 plt_plt_offset
= abed
->plt_plt_offset
;
5420 plt_got_insn_size
= abed
->plt_got_insn_size
;
5421 plt_got_offset
= abed
->plt_got_offset
;
5424 /* Use the second PLT with BND relocations. */
5425 const bfd_byte
*plt_entry
, *plt2_entry
;
5427 if (eh
->has_bnd_reloc
)
5429 plt_entry
= elf_x86_64_bnd_plt_entry
;
5430 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5434 plt_entry
= elf_x86_64_legacy_plt_entry
;
5435 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5437 /* Subtract 1 since there is no BND prefix. */
5438 plt_plt_insn_end
-= 1;
5439 plt_plt_offset
-= 1;
5440 plt_got_insn_size
-= 1;
5441 plt_got_offset
-= 1;
5444 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5445 == sizeof (elf_x86_64_legacy_plt_entry
));
5447 /* Fill in the entry in the procedure linkage table. */
5448 memcpy (plt
->contents
+ h
->plt
.offset
,
5449 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5450 /* Fill in the entry in the second PLT. */
5451 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5452 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5454 resolved_plt
= htab
->plt_bnd
;
5455 plt_offset
= eh
->plt_bnd
.offset
;
5459 /* Fill in the entry in the procedure linkage table. */
5460 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5461 abed
->plt_entry_size
);
5464 plt_offset
= h
->plt
.offset
;
5467 /* Insert the relocation positions of the plt section. */
5469 /* Put offset the PC-relative instruction referring to the GOT entry,
5470 subtracting the size of that instruction. */
5471 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5472 + gotplt
->output_offset
5474 - resolved_plt
->output_section
->vma
5475 - resolved_plt
->output_offset
5477 - plt_got_insn_size
);
5479 /* Check PC-relative offset overflow in PLT entry. */
5480 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5481 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5482 output_bfd
, h
->root
.root
.string
);
5484 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5485 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5487 /* Fill in the entry in the global offset table, initially this
5488 points to the second part of the PLT entry. */
5489 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5490 + plt
->output_offset
5491 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5492 gotplt
->contents
+ got_offset
);
5494 /* Fill in the entry in the .rela.plt section. */
5495 rela
.r_offset
= (gotplt
->output_section
->vma
5496 + gotplt
->output_offset
5498 if (h
->dynindx
== -1
5499 || ((bfd_link_executable (info
)
5500 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5502 && h
->type
== STT_GNU_IFUNC
))
5504 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5505 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5506 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5507 rela
.r_addend
= (h
->root
.u
.def
.value
5508 + h
->root
.u
.def
.section
->output_section
->vma
5509 + h
->root
.u
.def
.section
->output_offset
);
5510 /* R_X86_64_IRELATIVE comes last. */
5511 plt_index
= htab
->next_irelative_index
--;
5515 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5517 plt_index
= htab
->next_jump_slot_index
++;
5520 /* Don't fill PLT entry for static executables. */
5521 if (plt
== htab
->elf
.splt
)
5523 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5525 /* Put relocation index. */
5526 bfd_put_32 (output_bfd
, plt_index
,
5527 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5529 /* Put offset for jmp .PLT0 and check for overflow. We don't
5530 check relocation index for overflow since branch displacement
5531 will overflow first. */
5532 if (plt0_offset
> 0x80000000)
5533 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5534 output_bfd
, h
->root
.root
.string
);
5535 bfd_put_32 (output_bfd
, - plt0_offset
,
5536 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5539 bed
= get_elf_backend_data (output_bfd
);
5540 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5541 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5543 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5545 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5546 asection
*plt
, *got
;
5547 bfd_boolean got_after_plt
;
5548 int32_t got_pcrel_offset
;
5549 const bfd_byte
*got_plt_entry
;
5551 /* Set the entry in the GOT procedure linkage table. */
5552 plt
= htab
->plt_got
;
5553 got
= htab
->elf
.sgot
;
5554 got_offset
= h
->got
.offset
;
5556 if (got_offset
== (bfd_vma
) -1
5557 || h
->type
== STT_GNU_IFUNC
5562 /* Use the second PLT entry template for the GOT PLT since they
5563 are the identical. */
5564 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5565 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5566 if (eh
->has_bnd_reloc
)
5567 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5570 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5572 /* Subtract 1 since there is no BND prefix. */
5573 plt_got_insn_size
-= 1;
5574 plt_got_offset
-= 1;
5577 /* Fill in the entry in the GOT procedure linkage table. */
5578 plt_offset
= eh
->plt_got
.offset
;
5579 memcpy (plt
->contents
+ plt_offset
,
5580 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5582 /* Put offset the PC-relative instruction referring to the GOT
5583 entry, subtracting the size of that instruction. */
5584 got_pcrel_offset
= (got
->output_section
->vma
5585 + got
->output_offset
5587 - plt
->output_section
->vma
5588 - plt
->output_offset
5590 - plt_got_insn_size
);
5592 /* Check PC-relative offset overflow in GOT PLT entry. */
5593 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5594 if ((got_after_plt
&& got_pcrel_offset
< 0)
5595 || (!got_after_plt
&& got_pcrel_offset
> 0))
5596 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5597 output_bfd
, h
->root
.root
.string
);
5599 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5600 plt
->contents
+ plt_offset
+ plt_got_offset
);
5604 && (h
->plt
.offset
!= (bfd_vma
) -1
5605 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5607 /* Mark the symbol as undefined, rather than as defined in
5608 the .plt section. Leave the value if there were any
5609 relocations where pointer equality matters (this is a clue
5610 for the dynamic linker, to make function pointer
5611 comparisons work between an application and shared
5612 library), otherwise set it to zero. If a function is only
5613 called from a binary, there is no need to slow down
5614 shared libraries because of that. */
5615 sym
->st_shndx
= SHN_UNDEF
;
5616 if (!h
->pointer_equality_needed
)
5620 if (h
->got
.offset
!= (bfd_vma
) -1
5621 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5622 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5624 Elf_Internal_Rela rela
;
5626 /* This symbol has an entry in the global offset table. Set it
5628 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5631 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5632 + htab
->elf
.sgot
->output_offset
5633 + (h
->got
.offset
&~ (bfd_vma
) 1));
5635 /* If this is a static link, or it is a -Bsymbolic link and the
5636 symbol is defined locally or was forced to be local because
5637 of a version file, we just want to emit a RELATIVE reloc.
5638 The entry in the global offset table will already have been
5639 initialized in the relocate_section function. */
5641 && h
->type
== STT_GNU_IFUNC
)
5643 if (bfd_link_pic (info
))
5645 /* Generate R_X86_64_GLOB_DAT. */
5652 if (!h
->pointer_equality_needed
)
5655 /* For non-shared object, we can't use .got.plt, which
5656 contains the real function addres if we need pointer
5657 equality. We load the GOT entry with the PLT entry. */
5658 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5659 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5660 + plt
->output_offset
5662 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5666 else if (bfd_link_pic (info
)
5667 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5669 if (!h
->def_regular
)
5671 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5672 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5673 rela
.r_addend
= (h
->root
.u
.def
.value
5674 + h
->root
.u
.def
.section
->output_section
->vma
5675 + h
->root
.u
.def
.section
->output_offset
);
5679 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5681 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5682 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5683 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5687 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5692 Elf_Internal_Rela rela
;
5694 /* This symbol needs a copy reloc. Set it up. */
5696 if (h
->dynindx
== -1
5697 || (h
->root
.type
!= bfd_link_hash_defined
5698 && h
->root
.type
!= bfd_link_hash_defweak
)
5699 || htab
->srelbss
== NULL
)
5702 rela
.r_offset
= (h
->root
.u
.def
.value
5703 + h
->root
.u
.def
.section
->output_section
->vma
5704 + h
->root
.u
.def
.section
->output_offset
);
5705 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5707 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5713 /* Finish up local dynamic symbol handling. We set the contents of
5714 various dynamic sections here. */
5717 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5719 struct elf_link_hash_entry
*h
5720 = (struct elf_link_hash_entry
*) *slot
;
5721 struct bfd_link_info
*info
5722 = (struct bfd_link_info
*) inf
;
5724 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5728 /* Used to decide how to sort relocs in an optimal manner for the
5729 dynamic linker, before writing them out. */
5731 static enum elf_reloc_type_class
5732 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
5733 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5734 const Elf_Internal_Rela
*rela
)
5736 bfd
*abfd
= info
->output_bfd
;
5737 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5738 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
5740 if (htab
->elf
.dynsym
!= NULL
5741 && htab
->elf
.dynsym
->contents
!= NULL
)
5743 /* Check relocation against STT_GNU_IFUNC symbol if there are
5745 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
5746 Elf_Internal_Sym sym
;
5747 if (!bed
->s
->swap_symbol_in (abfd
,
5748 (htab
->elf
.dynsym
->contents
5749 + r_symndx
* bed
->s
->sizeof_sym
),
5753 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5754 return reloc_class_ifunc
;
5757 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5759 case R_X86_64_RELATIVE
:
5760 case R_X86_64_RELATIVE64
:
5761 return reloc_class_relative
;
5762 case R_X86_64_JUMP_SLOT
:
5763 return reloc_class_plt
;
5765 return reloc_class_copy
;
5767 return reloc_class_normal
;
5771 /* Finish up the dynamic sections. */
5774 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5775 struct bfd_link_info
*info
)
5777 struct elf_x86_64_link_hash_table
*htab
;
5780 const struct elf_x86_64_backend_data
*abed
;
5782 htab
= elf_x86_64_hash_table (info
);
5786 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5787 section only if there is .plt section. */
5788 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5789 ? &elf_x86_64_bnd_arch_bed
5790 : get_elf_x86_64_backend_data (output_bfd
));
5792 dynobj
= htab
->elf
.dynobj
;
5793 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5795 if (htab
->elf
.dynamic_sections_created
)
5797 bfd_byte
*dyncon
, *dynconend
;
5798 const struct elf_backend_data
*bed
;
5799 bfd_size_type sizeof_dyn
;
5801 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5804 bed
= get_elf_backend_data (dynobj
);
5805 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5806 dyncon
= sdyn
->contents
;
5807 dynconend
= sdyn
->contents
+ sdyn
->size
;
5808 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5810 Elf_Internal_Dyn dyn
;
5813 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5821 s
= htab
->elf
.sgotplt
;
5822 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5826 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5830 s
= htab
->elf
.srelplt
->output_section
;
5831 dyn
.d_un
.d_val
= s
->size
;
5835 /* The procedure linkage table relocs (DT_JMPREL) should
5836 not be included in the overall relocs (DT_RELA).
5837 Therefore, we override the DT_RELASZ entry here to
5838 make it not include the JMPREL relocs. Since the
5839 linker script arranges for .rela.plt to follow all
5840 other relocation sections, we don't have to worry
5841 about changing the DT_RELA entry. */
5842 if (htab
->elf
.srelplt
!= NULL
)
5844 s
= htab
->elf
.srelplt
->output_section
;
5845 dyn
.d_un
.d_val
-= s
->size
;
5849 case DT_TLSDESC_PLT
:
5851 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5852 + htab
->tlsdesc_plt
;
5855 case DT_TLSDESC_GOT
:
5857 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5858 + htab
->tlsdesc_got
;
5862 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5865 /* Fill in the special first entry in the procedure linkage table. */
5866 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5868 /* Fill in the first entry in the procedure linkage table. */
5869 memcpy (htab
->elf
.splt
->contents
,
5870 abed
->plt0_entry
, abed
->plt_entry_size
);
5871 /* Add offset for pushq GOT+8(%rip), since the instruction
5872 uses 6 bytes subtract this value. */
5873 bfd_put_32 (output_bfd
,
5874 (htab
->elf
.sgotplt
->output_section
->vma
5875 + htab
->elf
.sgotplt
->output_offset
5877 - htab
->elf
.splt
->output_section
->vma
5878 - htab
->elf
.splt
->output_offset
5880 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5881 /* Add offset for the PC-relative instruction accessing GOT+16,
5882 subtracting the offset to the end of that instruction. */
5883 bfd_put_32 (output_bfd
,
5884 (htab
->elf
.sgotplt
->output_section
->vma
5885 + htab
->elf
.sgotplt
->output_offset
5887 - htab
->elf
.splt
->output_section
->vma
5888 - htab
->elf
.splt
->output_offset
5889 - abed
->plt0_got2_insn_end
),
5890 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5892 elf_section_data (htab
->elf
.splt
->output_section
)
5893 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5895 if (htab
->tlsdesc_plt
)
5897 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5898 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5900 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5901 abed
->plt0_entry
, abed
->plt_entry_size
);
5903 /* Add offset for pushq GOT+8(%rip), since the
5904 instruction uses 6 bytes subtract this value. */
5905 bfd_put_32 (output_bfd
,
5906 (htab
->elf
.sgotplt
->output_section
->vma
5907 + htab
->elf
.sgotplt
->output_offset
5909 - htab
->elf
.splt
->output_section
->vma
5910 - htab
->elf
.splt
->output_offset
5913 htab
->elf
.splt
->contents
5914 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5915 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5916 where TGD stands for htab->tlsdesc_got, subtracting the offset
5917 to the end of that instruction. */
5918 bfd_put_32 (output_bfd
,
5919 (htab
->elf
.sgot
->output_section
->vma
5920 + htab
->elf
.sgot
->output_offset
5922 - htab
->elf
.splt
->output_section
->vma
5923 - htab
->elf
.splt
->output_offset
5925 - abed
->plt0_got2_insn_end
),
5926 htab
->elf
.splt
->contents
5927 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5932 if (htab
->plt_bnd
!= NULL
)
5933 elf_section_data (htab
->plt_bnd
->output_section
)
5934 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5936 if (htab
->elf
.sgotplt
)
5938 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5940 (*_bfd_error_handler
)
5941 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5945 /* Fill in the first three entries in the global offset table. */
5946 if (htab
->elf
.sgotplt
->size
> 0)
5948 /* Set the first entry in the global offset table to the address of
5949 the dynamic section. */
5951 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5953 bfd_put_64 (output_bfd
,
5954 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5955 htab
->elf
.sgotplt
->contents
);
5956 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5957 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5958 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5961 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5965 /* Adjust .eh_frame for .plt section. */
5966 if (htab
->plt_eh_frame
!= NULL
5967 && htab
->plt_eh_frame
->contents
!= NULL
)
5969 if (htab
->elf
.splt
!= NULL
5970 && htab
->elf
.splt
->size
!= 0
5971 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5972 && htab
->elf
.splt
->output_section
!= NULL
5973 && htab
->plt_eh_frame
->output_section
!= NULL
)
5975 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5976 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5977 + htab
->plt_eh_frame
->output_offset
5978 + PLT_FDE_START_OFFSET
;
5979 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5980 htab
->plt_eh_frame
->contents
5981 + PLT_FDE_START_OFFSET
);
5983 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5985 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5987 htab
->plt_eh_frame
->contents
))
5992 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5993 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5996 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5997 htab_traverse (htab
->loc_hash_table
,
5998 elf_x86_64_finish_local_dynamic_symbol
,
6004 /* Return an array of PLT entry symbol values. */
6007 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
6010 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
6013 bfd_vma
*plt_sym_val
;
6015 bfd_byte
*plt_contents
;
6016 const struct elf_x86_64_backend_data
*bed
;
6017 Elf_Internal_Shdr
*hdr
;
6020 /* Get the .plt section contents. PLT passed down may point to the
6021 .plt.bnd section. Make sure that PLT always points to the .plt
6023 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6028 plt
= bfd_get_section_by_name (abfd
, ".plt");
6031 bed
= &elf_x86_64_bnd_arch_bed
;
6034 bed
= get_elf_x86_64_backend_data (abfd
);
6036 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
6037 if (plt_contents
== NULL
)
6039 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
6040 plt_contents
, 0, plt
->size
))
6043 free (plt_contents
);
6047 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
6048 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
6051 hdr
= &elf_section_data (relplt
)->this_hdr
;
6052 count
= relplt
->size
/ hdr
->sh_entsize
;
6054 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
6055 if (plt_sym_val
== NULL
)
6058 for (i
= 0; i
< count
; i
++)
6059 plt_sym_val
[i
] = -1;
6061 plt_offset
= bed
->plt_entry_size
;
6062 p
= relplt
->relocation
;
6063 for (i
= 0; i
< count
; i
++, p
++)
6067 /* Skip unknown relocation. */
6068 if (p
->howto
== NULL
)
6071 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
6072 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
6075 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
6076 + bed
->plt_reloc_offset
));
6077 if (reloc_index
< count
)
6081 /* This is the index in .plt section. */
6082 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
6083 /* Store VMA + the offset in .plt.bnd section. */
6084 plt_sym_val
[reloc_index
] =
6086 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
6089 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
6091 plt_offset
+= bed
->plt_entry_size
;
6093 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6095 if (plt_offset
>= plt
->size
)
6099 free (plt_contents
);
6104 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6108 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
6115 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6116 as PLT if it exists. */
6117 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6119 plt
= bfd_get_section_by_name (abfd
, ".plt");
6120 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
6121 dynsymcount
, dynsyms
, ret
,
6123 elf_x86_64_get_plt_sym_val
);
6126 /* Handle an x86-64 specific section when reading an object file. This
6127 is called when elfcode.h finds a section with an unknown type. */
6130 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
6131 const char *name
, int shindex
)
6133 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
6136 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
6142 /* Hook called by the linker routine which adds symbols from an object
6143 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6147 elf_x86_64_add_symbol_hook (bfd
*abfd
,
6148 struct bfd_link_info
*info
,
6149 Elf_Internal_Sym
*sym
,
6150 const char **namep ATTRIBUTE_UNUSED
,
6151 flagword
*flagsp ATTRIBUTE_UNUSED
,
6157 switch (sym
->st_shndx
)
6159 case SHN_X86_64_LCOMMON
:
6160 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
6163 lcomm
= bfd_make_section_with_flags (abfd
,
6167 | SEC_LINKER_CREATED
));
6170 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
6173 *valp
= sym
->st_size
;
6177 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
6178 && (abfd
->flags
& DYNAMIC
) == 0
6179 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
6180 elf_tdata (info
->output_bfd
)->has_gnu_symbols
6181 |= elf_gnu_symbol_unique
;
6187 /* Given a BFD section, try to locate the corresponding ELF section
6191 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
6192 asection
*sec
, int *index_return
)
6194 if (sec
== &_bfd_elf_large_com_section
)
6196 *index_return
= SHN_X86_64_LCOMMON
;
6202 /* Process a symbol. */
6205 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
6208 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
6210 switch (elfsym
->internal_elf_sym
.st_shndx
)
6212 case SHN_X86_64_LCOMMON
:
6213 asym
->section
= &_bfd_elf_large_com_section
;
6214 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6215 /* Common symbol doesn't set BSF_GLOBAL. */
6216 asym
->flags
&= ~BSF_GLOBAL
;
6222 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6224 return (sym
->st_shndx
== SHN_COMMON
6225 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6229 elf_x86_64_common_section_index (asection
*sec
)
6231 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6234 return SHN_X86_64_LCOMMON
;
6238 elf_x86_64_common_section (asection
*sec
)
6240 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6241 return bfd_com_section_ptr
;
6243 return &_bfd_elf_large_com_section
;
6247 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6248 const Elf_Internal_Sym
*sym
,
6253 const asection
*oldsec
)
6255 /* A normal common symbol and a large common symbol result in a
6256 normal common symbol. We turn the large common symbol into a
6259 && h
->root
.type
== bfd_link_hash_common
6261 && bfd_is_com_section (*psec
)
6264 if (sym
->st_shndx
== SHN_COMMON
6265 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6267 h
->root
.u
.c
.p
->section
6268 = bfd_make_section_old_way (oldbfd
, "COMMON");
6269 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6271 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6272 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6273 *psec
= bfd_com_section_ptr
;
6280 elf_x86_64_additional_program_headers (bfd
*abfd
,
6281 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6286 /* Check to see if we need a large readonly segment. */
6287 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6288 if (s
&& (s
->flags
& SEC_LOAD
))
6291 /* Check to see if we need a large data segment. Since .lbss sections
6292 is placed right after the .bss section, there should be no need for
6293 a large data segment just because of .lbss. */
6294 s
= bfd_get_section_by_name (abfd
, ".ldata");
6295 if (s
&& (s
->flags
& SEC_LOAD
))
6301 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6304 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6306 if (h
->plt
.offset
!= (bfd_vma
) -1
6308 && !h
->pointer_equality_needed
)
6311 return _bfd_elf_hash_symbol (h
);
6314 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6317 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6318 const bfd_target
*output
)
6320 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6321 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6322 && _bfd_elf_relocs_compatible (input
, output
));
6325 static const struct bfd_elf_special_section
6326 elf_x86_64_special_sections
[]=
6328 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6329 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6330 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6331 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6332 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6333 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6334 { NULL
, 0, 0, 0, 0 }
6337 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6338 #define TARGET_LITTLE_NAME "elf64-x86-64"
6339 #define ELF_ARCH bfd_arch_i386
6340 #define ELF_TARGET_ID X86_64_ELF_DATA
6341 #define ELF_MACHINE_CODE EM_X86_64
6342 #define ELF_MAXPAGESIZE 0x200000
6343 #define ELF_MINPAGESIZE 0x1000
6344 #define ELF_COMMONPAGESIZE 0x1000
6346 #define elf_backend_can_gc_sections 1
6347 #define elf_backend_can_refcount 1
6348 #define elf_backend_want_got_plt 1
6349 #define elf_backend_plt_readonly 1
6350 #define elf_backend_want_plt_sym 0
6351 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6352 #define elf_backend_rela_normal 1
6353 #define elf_backend_plt_alignment 4
6354 #define elf_backend_extern_protected_data 1
6356 #define elf_info_to_howto elf_x86_64_info_to_howto
6358 #define bfd_elf64_bfd_link_hash_table_create \
6359 elf_x86_64_link_hash_table_create
6360 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6361 #define bfd_elf64_bfd_reloc_name_lookup \
6362 elf_x86_64_reloc_name_lookup
6364 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6365 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6366 #define elf_backend_check_relocs elf_x86_64_check_relocs
6367 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6368 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6369 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6370 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6371 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6372 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6373 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6374 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6376 #define elf_backend_write_core_note elf_x86_64_write_core_note
6378 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6379 #define elf_backend_relocate_section elf_x86_64_relocate_section
6380 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6381 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6382 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6383 #define elf_backend_object_p elf64_x86_64_elf_object_p
6384 #define bfd_elf64_mkobject elf_x86_64_mkobject
6385 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6387 #define elf_backend_section_from_shdr \
6388 elf_x86_64_section_from_shdr
6390 #define elf_backend_section_from_bfd_section \
6391 elf_x86_64_elf_section_from_bfd_section
6392 #define elf_backend_add_symbol_hook \
6393 elf_x86_64_add_symbol_hook
6394 #define elf_backend_symbol_processing \
6395 elf_x86_64_symbol_processing
6396 #define elf_backend_common_section_index \
6397 elf_x86_64_common_section_index
6398 #define elf_backend_common_section \
6399 elf_x86_64_common_section
6400 #define elf_backend_common_definition \
6401 elf_x86_64_common_definition
6402 #define elf_backend_merge_symbol \
6403 elf_x86_64_merge_symbol
6404 #define elf_backend_special_sections \
6405 elf_x86_64_special_sections
6406 #define elf_backend_additional_program_headers \
6407 elf_x86_64_additional_program_headers
6408 #define elf_backend_hash_symbol \
6409 elf_x86_64_hash_symbol
6410 #define elf_backend_omit_section_dynsym \
6411 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6413 #include "elf64-target.h"
6415 /* CloudABI support. */
6417 #undef TARGET_LITTLE_SYM
6418 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6419 #undef TARGET_LITTLE_NAME
6420 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6423 #define ELF_OSABI ELFOSABI_CLOUDABI
6426 #define elf64_bed elf64_x86_64_cloudabi_bed
6428 #include "elf64-target.h"
6430 /* FreeBSD support. */
6432 #undef TARGET_LITTLE_SYM
6433 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6434 #undef TARGET_LITTLE_NAME
6435 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6438 #define ELF_OSABI ELFOSABI_FREEBSD
6441 #define elf64_bed elf64_x86_64_fbsd_bed
6443 #include "elf64-target.h"
6445 /* Solaris 2 support. */
6447 #undef TARGET_LITTLE_SYM
6448 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6449 #undef TARGET_LITTLE_NAME
6450 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6452 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6453 objects won't be recognized. */
6457 #define elf64_bed elf64_x86_64_sol2_bed
6459 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6461 #undef elf_backend_static_tls_alignment
6462 #define elf_backend_static_tls_alignment 16
6464 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6466 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6468 #undef elf_backend_want_plt_sym
6469 #define elf_backend_want_plt_sym 1
6471 #include "elf64-target.h"
6473 /* Native Client support. */
6476 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6478 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6479 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6483 #undef TARGET_LITTLE_SYM
6484 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6485 #undef TARGET_LITTLE_NAME
6486 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6488 #define elf64_bed elf64_x86_64_nacl_bed
6490 #undef ELF_MAXPAGESIZE
6491 #undef ELF_MINPAGESIZE
6492 #undef ELF_COMMONPAGESIZE
6493 #define ELF_MAXPAGESIZE 0x10000
6494 #define ELF_MINPAGESIZE 0x10000
6495 #define ELF_COMMONPAGESIZE 0x10000
6497 /* Restore defaults. */
6499 #undef elf_backend_static_tls_alignment
6500 #undef elf_backend_want_plt_sym
6501 #define elf_backend_want_plt_sym 0
6503 /* NaCl uses substantially different PLT entries for the same effects. */
6505 #undef elf_backend_plt_alignment
6506 #define elf_backend_plt_alignment 5
6507 #define NACL_PLT_ENTRY_SIZE 64
6508 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6510 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6512 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6513 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6514 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6515 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6516 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6518 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6519 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6521 /* 32 bytes of nop to pad out to the standard size. */
6522 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6523 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6524 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6525 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6526 0x66, /* excess data32 prefix */
6530 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6532 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6533 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6534 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6535 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6537 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6538 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6539 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6541 /* Lazy GOT entries point here (32-byte aligned). */
6542 0x68, /* pushq immediate */
6543 0, 0, 0, 0, /* replaced with index into relocation table. */
6544 0xe9, /* jmp relative */
6545 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6547 /* 22 bytes of nop to pad out to the standard size. */
6548 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6549 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6550 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6553 /* .eh_frame covering the .plt section. */
6555 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6557 #if (PLT_CIE_LENGTH != 20 \
6558 || PLT_FDE_LENGTH != 36 \
6559 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6560 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6561 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6563 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6564 0, 0, 0, 0, /* CIE ID */
6565 1, /* CIE version */
6566 'z', 'R', 0, /* Augmentation string */
6567 1, /* Code alignment factor */
6568 0x78, /* Data alignment factor */
6569 16, /* Return address column */
6570 1, /* Augmentation size */
6571 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6572 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6573 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6574 DW_CFA_nop
, DW_CFA_nop
,
6576 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6577 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6578 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6579 0, 0, 0, 0, /* .plt size goes here */
6580 0, /* Augmentation size */
6581 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6582 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6583 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6584 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6585 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6586 13, /* Block length */
6587 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6588 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6589 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6590 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6591 DW_CFA_nop
, DW_CFA_nop
6594 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6596 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6597 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6598 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6599 2, /* plt0_got1_offset */
6600 9, /* plt0_got2_offset */
6601 13, /* plt0_got2_insn_end */
6602 3, /* plt_got_offset */
6603 33, /* plt_reloc_offset */
6604 38, /* plt_plt_offset */
6605 7, /* plt_got_insn_size */
6606 42, /* plt_plt_insn_end */
6607 32, /* plt_lazy_offset */
6608 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6609 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6612 #undef elf_backend_arch_data
6613 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6615 #undef elf_backend_object_p
6616 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6617 #undef elf_backend_modify_segment_map
6618 #define elf_backend_modify_segment_map nacl_modify_segment_map
6619 #undef elf_backend_modify_program_headers
6620 #define elf_backend_modify_program_headers nacl_modify_program_headers
6621 #undef elf_backend_final_write_processing
6622 #define elf_backend_final_write_processing nacl_final_write_processing
6624 #include "elf64-target.h"
6626 /* Native Client x32 support. */
6629 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6631 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6632 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6636 #undef TARGET_LITTLE_SYM
6637 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6638 #undef TARGET_LITTLE_NAME
6639 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6641 #define elf32_bed elf32_x86_64_nacl_bed
6643 #define bfd_elf32_bfd_link_hash_table_create \
6644 elf_x86_64_link_hash_table_create
6645 #define bfd_elf32_bfd_reloc_type_lookup \
6646 elf_x86_64_reloc_type_lookup
6647 #define bfd_elf32_bfd_reloc_name_lookup \
6648 elf_x86_64_reloc_name_lookup
6649 #define bfd_elf32_mkobject \
6651 #define bfd_elf32_get_synthetic_symtab \
6652 elf_x86_64_get_synthetic_symtab
6654 #undef elf_backend_object_p
6655 #define elf_backend_object_p \
6656 elf32_x86_64_nacl_elf_object_p
6658 #undef elf_backend_bfd_from_remote_memory
6659 #define elf_backend_bfd_from_remote_memory \
6660 _bfd_elf32_bfd_from_remote_memory
6662 #undef elf_backend_size_info
6663 #define elf_backend_size_info \
6664 _bfd_elf32_size_info
6666 #include "elf32-target.h"
6668 /* Restore defaults. */
6669 #undef elf_backend_object_p
6670 #define elf_backend_object_p elf64_x86_64_elf_object_p
6671 #undef elf_backend_bfd_from_remote_memory
6672 #undef elf_backend_size_info
6673 #undef elf_backend_modify_segment_map
6674 #undef elf_backend_modify_program_headers
6675 #undef elf_backend_final_write_processing
6677 /* Intel L1OM support. */
6680 elf64_l1om_elf_object_p (bfd
*abfd
)
6682 /* Set the right machine number for an L1OM elf64 file. */
6683 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6687 #undef TARGET_LITTLE_SYM
6688 #define TARGET_LITTLE_SYM l1om_elf64_vec
6689 #undef TARGET_LITTLE_NAME
6690 #define TARGET_LITTLE_NAME "elf64-l1om"
6692 #define ELF_ARCH bfd_arch_l1om
6694 #undef ELF_MACHINE_CODE
6695 #define ELF_MACHINE_CODE EM_L1OM
6700 #define elf64_bed elf64_l1om_bed
6702 #undef elf_backend_object_p
6703 #define elf_backend_object_p elf64_l1om_elf_object_p
6705 /* Restore defaults. */
6706 #undef ELF_MAXPAGESIZE
6707 #undef ELF_MINPAGESIZE
6708 #undef ELF_COMMONPAGESIZE
6709 #define ELF_MAXPAGESIZE 0x200000
6710 #define ELF_MINPAGESIZE 0x1000
6711 #define ELF_COMMONPAGESIZE 0x1000
6712 #undef elf_backend_plt_alignment
6713 #define elf_backend_plt_alignment 4
6714 #undef elf_backend_arch_data
6715 #define elf_backend_arch_data &elf_x86_64_arch_bed
6717 #include "elf64-target.h"
6719 /* FreeBSD L1OM support. */
6721 #undef TARGET_LITTLE_SYM
6722 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6723 #undef TARGET_LITTLE_NAME
6724 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6727 #define ELF_OSABI ELFOSABI_FREEBSD
6730 #define elf64_bed elf64_l1om_fbsd_bed
6732 #include "elf64-target.h"
6734 /* Intel K1OM support. */
6737 elf64_k1om_elf_object_p (bfd
*abfd
)
6739 /* Set the right machine number for an K1OM elf64 file. */
6740 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6744 #undef TARGET_LITTLE_SYM
6745 #define TARGET_LITTLE_SYM k1om_elf64_vec
6746 #undef TARGET_LITTLE_NAME
6747 #define TARGET_LITTLE_NAME "elf64-k1om"
6749 #define ELF_ARCH bfd_arch_k1om
6751 #undef ELF_MACHINE_CODE
6752 #define ELF_MACHINE_CODE EM_K1OM
6757 #define elf64_bed elf64_k1om_bed
6759 #undef elf_backend_object_p
6760 #define elf_backend_object_p elf64_k1om_elf_object_p
6762 #undef elf_backend_static_tls_alignment
6764 #undef elf_backend_want_plt_sym
6765 #define elf_backend_want_plt_sym 0
6767 #include "elf64-target.h"
6769 /* FreeBSD K1OM support. */
6771 #undef TARGET_LITTLE_SYM
6772 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6773 #undef TARGET_LITTLE_NAME
6774 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6777 #define ELF_OSABI ELFOSABI_FREEBSD
6780 #define elf64_bed elf64_k1om_fbsd_bed
6782 #include "elf64-target.h"
6784 /* 32bit x86-64 support. */
6786 #undef TARGET_LITTLE_SYM
6787 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6788 #undef TARGET_LITTLE_NAME
6789 #define TARGET_LITTLE_NAME "elf32-x86-64"
6793 #define ELF_ARCH bfd_arch_i386
6795 #undef ELF_MACHINE_CODE
6796 #define ELF_MACHINE_CODE EM_X86_64
6800 #undef elf_backend_object_p
6801 #define elf_backend_object_p \
6802 elf32_x86_64_elf_object_p
6804 #undef elf_backend_bfd_from_remote_memory
6805 #define elf_backend_bfd_from_remote_memory \
6806 _bfd_elf32_bfd_from_remote_memory
6808 #undef elf_backend_size_info
6809 #define elf_backend_size_info \
6810 _bfd_elf32_size_info
6812 #include "elf32-target.h"