1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 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. */
3130 if ((h
->root
.type
== bfd_link_hash_defined
3131 || h
->root
.type
== bfd_link_hash_defweak
)
3132 && h
->type
!= STT_GNU_IFUNC
3133 && h
!= htab
->elf
.hdynamic
3134 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3136 tsec
= h
->root
.u
.def
.section
;
3137 toff
= h
->root
.u
.def
.value
;
3144 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3146 /* At this stage in linking, no SEC_MERGE symbol has been
3147 adjusted, so all references to such symbols need to be
3148 passed through _bfd_merged_section_offset. (Later, in
3149 relocate_section, all SEC_MERGE symbols *except* for
3150 section symbols have been adjusted.)
3152 gas may reduce relocations against symbols in SEC_MERGE
3153 sections to a relocation against the section symbol when
3154 the original addend was zero. When the reloc is against
3155 a section symbol we should include the addend in the
3156 offset passed to _bfd_merged_section_offset, since the
3157 location of interest is the original symbol. On the
3158 other hand, an access to "sym+addend" where "sym" is not
3159 a section symbol should not include the addend; Such an
3160 access is presumed to be an offset from "sym"; The
3161 location of interest is just "sym". */
3162 if (symtype
== STT_SECTION
)
3165 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3166 elf_section_data (tsec
)->sec_info
,
3169 if (symtype
!= STT_SECTION
)
3175 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3176 if (tsec
->output_section
== sec
->output_section
)
3178 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3186 /* At this point, we don't know the load addresses of TSEC
3187 section nor SEC section. We estimate the distrance between
3190 for (asect
= sec
->output_section
;
3191 asect
!= NULL
&& asect
!= tsec
->output_section
;
3192 asect
= asect
->next
)
3195 for (i
= asect
->output_section
->map_head
.s
;
3199 size
= align_power (size
, i
->alignment_power
);
3204 /* Don't convert GOTPCREL relocations if TSEC isn't placed
3209 /* Take PT_GNU_RELRO segment into account by adding
3211 if ((toff
+ size
+ maxpagesize
- roff
+ 0x80000000)
3218 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
3223 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
3225 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3228 /* Convert to "jmp foo nop". */
3231 nop_offset
= irel
->r_offset
+ 3;
3232 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3233 irel
->r_offset
-= 1;
3234 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3238 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3241 nop
= link_info
->call_nop_byte
;
3242 if (link_info
->call_nop_as_suffix
)
3244 nop_offset
= irel
->r_offset
+ 3;
3245 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3246 irel
->r_offset
-= 1;
3247 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3250 nop_offset
= irel
->r_offset
- 2;
3252 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
3253 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
3254 r_type
= R_X86_64_PC32
;
3260 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
3261 "lea foo(%rip), %reg". */
3263 r_type
= R_X86_64_PC32
;
3267 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3270 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
3271 "test $foo, %reg". */
3272 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
3277 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
3278 "binop $foo, %reg". */
3279 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
3282 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
3284 if (r_type
== R_X86_64_REX_GOTPCRELX
)
3286 /* Move the R bit to the B bit in REX byte. */
3287 unsigned int rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
3288 rex
= (rex
& ~REX_R
) | (rex
& REX_R
) >> 2;
3289 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
3291 /* No addend for R_X86_64_32S relocation. */
3293 r_type
= R_X86_64_32S
;
3296 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
3299 irel
->r_info
= htab
->r_info (r_symndx
, r_type
);
3300 changed_contents
= TRUE
;
3301 changed_relocs
= TRUE
;
3305 if (h
->got
.refcount
> 0)
3306 h
->got
.refcount
-= 1;
3310 if (local_got_refcounts
!= NULL
3311 && local_got_refcounts
[r_symndx
] > 0)
3312 local_got_refcounts
[r_symndx
] -= 1;
3316 if (contents
!= NULL
3317 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3319 if (!changed_contents
&& !link_info
->keep_memory
)
3323 /* Cache the section contents for elf_link_input_bfd. */
3324 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3328 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3330 if (!changed_relocs
)
3331 free (internal_relocs
);
3333 elf_section_data (sec
)->relocs
= internal_relocs
;
3339 if (contents
!= NULL
3340 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3342 if (internal_relocs
!= NULL
3343 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3344 free (internal_relocs
);
3348 /* Set the sizes of the dynamic sections. */
3351 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3352 struct bfd_link_info
*info
)
3354 struct elf_x86_64_link_hash_table
*htab
;
3359 const struct elf_backend_data
*bed
;
3361 htab
= elf_x86_64_hash_table (info
);
3364 bed
= get_elf_backend_data (output_bfd
);
3366 dynobj
= htab
->elf
.dynobj
;
3370 if (htab
->elf
.dynamic_sections_created
)
3372 /* Set the contents of the .interp section to the interpreter. */
3373 if (bfd_link_executable (info
) && !info
->nointerp
)
3375 s
= bfd_get_linker_section (dynobj
, ".interp");
3378 s
->size
= htab
->dynamic_interpreter_size
;
3379 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3383 /* Set up .got offsets for local syms, and space for local dynamic
3385 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3387 bfd_signed_vma
*local_got
;
3388 bfd_signed_vma
*end_local_got
;
3389 char *local_tls_type
;
3390 bfd_vma
*local_tlsdesc_gotent
;
3391 bfd_size_type locsymcount
;
3392 Elf_Internal_Shdr
*symtab_hdr
;
3395 if (! is_x86_64_elf (ibfd
))
3398 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3400 struct elf_dyn_relocs
*p
;
3402 if (!elf_x86_64_convert_load (ibfd
, s
, info
))
3405 for (p
= (struct elf_dyn_relocs
*)
3406 (elf_section_data (s
)->local_dynrel
);
3410 if (!bfd_is_abs_section (p
->sec
)
3411 && bfd_is_abs_section (p
->sec
->output_section
))
3413 /* Input section has been discarded, either because
3414 it is a copy of a linkonce section or due to
3415 linker script /DISCARD/, so we'll be discarding
3418 else if (p
->count
!= 0)
3420 srel
= elf_section_data (p
->sec
)->sreloc
;
3421 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3422 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3423 && (info
->flags
& DF_TEXTREL
) == 0)
3425 info
->flags
|= DF_TEXTREL
;
3426 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3427 || info
->error_textrel
)
3428 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3429 p
->sec
->owner
, p
->sec
);
3435 local_got
= elf_local_got_refcounts (ibfd
);
3439 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3440 locsymcount
= symtab_hdr
->sh_info
;
3441 end_local_got
= local_got
+ locsymcount
;
3442 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3443 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3445 srel
= htab
->elf
.srelgot
;
3446 for (; local_got
< end_local_got
;
3447 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3449 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3452 if (GOT_TLS_GDESC_P (*local_tls_type
))
3454 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3455 - elf_x86_64_compute_jump_table_size (htab
);
3456 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3457 *local_got
= (bfd_vma
) -2;
3459 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3460 || GOT_TLS_GD_P (*local_tls_type
))
3462 *local_got
= s
->size
;
3463 s
->size
+= GOT_ENTRY_SIZE
;
3464 if (GOT_TLS_GD_P (*local_tls_type
))
3465 s
->size
+= GOT_ENTRY_SIZE
;
3467 if (bfd_link_pic (info
)
3468 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3469 || *local_tls_type
== GOT_TLS_IE
)
3471 if (GOT_TLS_GDESC_P (*local_tls_type
))
3473 htab
->elf
.srelplt
->size
3474 += bed
->s
->sizeof_rela
;
3475 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3477 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3478 || GOT_TLS_GD_P (*local_tls_type
))
3479 srel
->size
+= bed
->s
->sizeof_rela
;
3483 *local_got
= (bfd_vma
) -1;
3487 if (htab
->tls_ld_got
.refcount
> 0)
3489 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3491 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3492 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3493 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3496 htab
->tls_ld_got
.offset
= -1;
3498 /* Allocate global sym .plt and .got entries, and space for global
3499 sym dynamic relocs. */
3500 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3503 /* Allocate .plt and .got entries, and space for local symbols. */
3504 htab_traverse (htab
->loc_hash_table
,
3505 elf_x86_64_allocate_local_dynrelocs
,
3508 /* For every jump slot reserved in the sgotplt, reloc_count is
3509 incremented. However, when we reserve space for TLS descriptors,
3510 it's not incremented, so in order to compute the space reserved
3511 for them, it suffices to multiply the reloc count by the jump
3514 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3515 so that R_X86_64_IRELATIVE entries come last. */
3516 if (htab
->elf
.srelplt
)
3518 htab
->sgotplt_jump_table_size
3519 = elf_x86_64_compute_jump_table_size (htab
);
3520 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3522 else if (htab
->elf
.irelplt
)
3523 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3525 if (htab
->tlsdesc_plt
)
3527 /* If we're not using lazy TLS relocations, don't generate the
3528 PLT and GOT entries they require. */
3529 if ((info
->flags
& DF_BIND_NOW
))
3530 htab
->tlsdesc_plt
= 0;
3533 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3534 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3535 /* Reserve room for the initial entry.
3536 FIXME: we could probably do away with it in this case. */
3537 if (htab
->elf
.splt
->size
== 0)
3538 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3539 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3540 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3544 if (htab
->elf
.sgotplt
)
3546 /* Don't allocate .got.plt section if there are no GOT nor PLT
3547 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3548 if ((htab
->elf
.hgot
== NULL
3549 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3550 && (htab
->elf
.sgotplt
->size
3551 == get_elf_backend_data (output_bfd
)->got_header_size
)
3552 && (htab
->elf
.splt
== NULL
3553 || htab
->elf
.splt
->size
== 0)
3554 && (htab
->elf
.sgot
== NULL
3555 || htab
->elf
.sgot
->size
== 0)
3556 && (htab
->elf
.iplt
== NULL
3557 || htab
->elf
.iplt
->size
== 0)
3558 && (htab
->elf
.igotplt
== NULL
3559 || htab
->elf
.igotplt
->size
== 0))
3560 htab
->elf
.sgotplt
->size
= 0;
3563 if (htab
->plt_eh_frame
!= NULL
3564 && htab
->elf
.splt
!= NULL
3565 && htab
->elf
.splt
->size
!= 0
3566 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3567 && _bfd_elf_eh_frame_present (info
))
3569 const struct elf_x86_64_backend_data
*arch_data
3570 = get_elf_x86_64_arch_data (bed
);
3571 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3574 /* We now have determined the sizes of the various dynamic sections.
3575 Allocate memory for them. */
3577 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3579 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3582 if (s
== htab
->elf
.splt
3583 || s
== htab
->elf
.sgot
3584 || s
== htab
->elf
.sgotplt
3585 || s
== htab
->elf
.iplt
3586 || s
== htab
->elf
.igotplt
3587 || s
== htab
->plt_bnd
3588 || s
== htab
->plt_got
3589 || s
== htab
->plt_eh_frame
3590 || s
== htab
->sdynbss
)
3592 /* Strip this section if we don't need it; see the
3595 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3597 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3600 /* We use the reloc_count field as a counter if we need
3601 to copy relocs into the output file. */
3602 if (s
!= htab
->elf
.srelplt
)
3607 /* It's not one of our sections, so don't allocate space. */
3613 /* If we don't need this section, strip it from the
3614 output file. This is mostly to handle .rela.bss and
3615 .rela.plt. We must create both sections in
3616 create_dynamic_sections, because they must be created
3617 before the linker maps input sections to output
3618 sections. The linker does that before
3619 adjust_dynamic_symbol is called, and it is that
3620 function which decides whether anything needs to go
3621 into these sections. */
3623 s
->flags
|= SEC_EXCLUDE
;
3627 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3630 /* Allocate memory for the section contents. We use bfd_zalloc
3631 here in case unused entries are not reclaimed before the
3632 section's contents are written out. This should not happen,
3633 but this way if it does, we get a R_X86_64_NONE reloc instead
3635 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3636 if (s
->contents
== NULL
)
3640 if (htab
->plt_eh_frame
!= NULL
3641 && htab
->plt_eh_frame
->contents
!= NULL
)
3643 const struct elf_x86_64_backend_data
*arch_data
3644 = get_elf_x86_64_arch_data (bed
);
3646 memcpy (htab
->plt_eh_frame
->contents
,
3647 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3648 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3649 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3652 if (htab
->elf
.dynamic_sections_created
)
3654 /* Add some entries to the .dynamic section. We fill in the
3655 values later, in elf_x86_64_finish_dynamic_sections, but we
3656 must add the entries now so that we get the correct size for
3657 the .dynamic section. The DT_DEBUG entry is filled in by the
3658 dynamic linker and used by the debugger. */
3659 #define add_dynamic_entry(TAG, VAL) \
3660 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3662 if (bfd_link_executable (info
))
3664 if (!add_dynamic_entry (DT_DEBUG
, 0))
3668 if (htab
->elf
.splt
->size
!= 0)
3670 /* DT_PLTGOT is used by prelink even if there is no PLT
3672 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3675 if (htab
->elf
.srelplt
->size
!= 0)
3677 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3678 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3679 || !add_dynamic_entry (DT_JMPREL
, 0))
3683 if (htab
->tlsdesc_plt
3684 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3685 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3691 if (!add_dynamic_entry (DT_RELA
, 0)
3692 || !add_dynamic_entry (DT_RELASZ
, 0)
3693 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3696 /* If any dynamic relocs apply to a read-only section,
3697 then we need a DT_TEXTREL entry. */
3698 if ((info
->flags
& DF_TEXTREL
) == 0)
3699 elf_link_hash_traverse (&htab
->elf
,
3700 elf_x86_64_readonly_dynrelocs
,
3703 if ((info
->flags
& DF_TEXTREL
) != 0)
3705 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3706 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3708 info
->callbacks
->einfo
3709 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3710 bfd_set_error (bfd_error_bad_value
);
3714 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3719 #undef add_dynamic_entry
3725 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3726 struct bfd_link_info
*info
)
3728 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3732 struct elf_link_hash_entry
*tlsbase
;
3734 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3735 "_TLS_MODULE_BASE_",
3736 FALSE
, FALSE
, FALSE
);
3738 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3740 struct elf_x86_64_link_hash_table
*htab
;
3741 struct bfd_link_hash_entry
*bh
= NULL
;
3742 const struct elf_backend_data
*bed
3743 = get_elf_backend_data (output_bfd
);
3745 htab
= elf_x86_64_hash_table (info
);
3749 if (!(_bfd_generic_link_add_one_symbol
3750 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3751 tls_sec
, 0, NULL
, FALSE
,
3752 bed
->collect
, &bh
)))
3755 htab
->tls_module_base
= bh
;
3757 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3758 tlsbase
->def_regular
= 1;
3759 tlsbase
->other
= STV_HIDDEN
;
3760 tlsbase
->root
.linker_def
= 1;
3761 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3768 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3769 executables. Rather than setting it to the beginning of the TLS
3770 section, we have to set it to the end. This function may be called
3771 multiple times, it is idempotent. */
3774 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3776 struct elf_x86_64_link_hash_table
*htab
;
3777 struct bfd_link_hash_entry
*base
;
3779 if (!bfd_link_executable (info
))
3782 htab
= elf_x86_64_hash_table (info
);
3786 base
= htab
->tls_module_base
;
3790 base
->u
.def
.value
= htab
->elf
.tls_size
;
3793 /* Return the base VMA address which should be subtracted from real addresses
3794 when resolving @dtpoff relocation.
3795 This is PT_TLS segment p_vaddr. */
3798 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3800 /* If tls_sec is NULL, we should have signalled an error already. */
3801 if (elf_hash_table (info
)->tls_sec
== NULL
)
3803 return elf_hash_table (info
)->tls_sec
->vma
;
3806 /* Return the relocation value for @tpoff relocation
3807 if STT_TLS virtual address is ADDRESS. */
3810 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3812 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3813 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3814 bfd_vma static_tls_size
;
3816 /* If tls_segment is NULL, we should have signalled an error already. */
3817 if (htab
->tls_sec
== NULL
)
3820 /* Consider special static TLS alignment requirements. */
3821 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3822 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3825 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3829 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3831 /* Opcode Instruction
3834 0x0f 0x8x conditional jump */
3836 && (contents
[offset
- 1] == 0xe8
3837 || contents
[offset
- 1] == 0xe9))
3839 && contents
[offset
- 2] == 0x0f
3840 && (contents
[offset
- 1] & 0xf0) == 0x80));
3843 /* Relocate an x86_64 ELF section. */
3846 elf_x86_64_relocate_section (bfd
*output_bfd
,
3847 struct bfd_link_info
*info
,
3849 asection
*input_section
,
3851 Elf_Internal_Rela
*relocs
,
3852 Elf_Internal_Sym
*local_syms
,
3853 asection
**local_sections
)
3855 struct elf_x86_64_link_hash_table
*htab
;
3856 Elf_Internal_Shdr
*symtab_hdr
;
3857 struct elf_link_hash_entry
**sym_hashes
;
3858 bfd_vma
*local_got_offsets
;
3859 bfd_vma
*local_tlsdesc_gotents
;
3860 Elf_Internal_Rela
*rel
;
3861 Elf_Internal_Rela
*relend
;
3862 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3864 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3866 htab
= elf_x86_64_hash_table (info
);
3869 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3870 sym_hashes
= elf_sym_hashes (input_bfd
);
3871 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3872 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3874 elf_x86_64_set_tls_module_base (info
);
3877 relend
= relocs
+ input_section
->reloc_count
;
3878 for (; rel
< relend
; rel
++)
3880 unsigned int r_type
;
3881 reloc_howto_type
*howto
;
3882 unsigned long r_symndx
;
3883 struct elf_link_hash_entry
*h
;
3884 struct elf_x86_64_link_hash_entry
*eh
;
3885 Elf_Internal_Sym
*sym
;
3887 bfd_vma off
, offplt
, plt_offset
;
3889 bfd_boolean unresolved_reloc
;
3890 bfd_reloc_status_type r
;
3892 asection
*base_got
, *resolved_plt
;
3895 r_type
= ELF32_R_TYPE (rel
->r_info
);
3896 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3897 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3900 if (r_type
>= (int) R_X86_64_standard
)
3902 (*_bfd_error_handler
)
3903 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3904 input_bfd
, input_section
, r_type
);
3905 bfd_set_error (bfd_error_bad_value
);
3909 if (r_type
!= (int) R_X86_64_32
3910 || ABI_64_P (output_bfd
))
3911 howto
= x86_64_elf_howto_table
+ r_type
;
3913 howto
= (x86_64_elf_howto_table
3914 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3915 r_symndx
= htab
->r_sym (rel
->r_info
);
3919 unresolved_reloc
= FALSE
;
3920 if (r_symndx
< symtab_hdr
->sh_info
)
3922 sym
= local_syms
+ r_symndx
;
3923 sec
= local_sections
[r_symndx
];
3925 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3927 st_size
= sym
->st_size
;
3929 /* Relocate against local STT_GNU_IFUNC symbol. */
3930 if (!bfd_link_relocatable (info
)
3931 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3933 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3938 /* Set STT_GNU_IFUNC symbol value. */
3939 h
->root
.u
.def
.value
= sym
->st_value
;
3940 h
->root
.u
.def
.section
= sec
;
3945 bfd_boolean warned ATTRIBUTE_UNUSED
;
3946 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3948 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3949 r_symndx
, symtab_hdr
, sym_hashes
,
3951 unresolved_reloc
, warned
, ignored
);
3955 if (sec
!= NULL
&& discarded_section (sec
))
3956 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3957 rel
, 1, relend
, howto
, 0, contents
);
3959 if (bfd_link_relocatable (info
))
3962 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
3964 if (r_type
== R_X86_64_64
)
3966 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3967 zero-extend it to 64bit if addend is zero. */
3968 r_type
= R_X86_64_32
;
3969 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3971 else if (r_type
== R_X86_64_SIZE64
)
3973 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3974 zero-extend it to 64bit if addend is zero. */
3975 r_type
= R_X86_64_SIZE32
;
3976 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3980 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3982 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3983 it here if it is defined in a non-shared object. */
3985 && h
->type
== STT_GNU_IFUNC
3991 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3993 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3994 sections because such sections are not SEC_ALLOC and
3995 thus ld.so will not process them. */
3996 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
4000 else if (h
->plt
.offset
== (bfd_vma
) -1)
4003 /* STT_GNU_IFUNC symbol must go through PLT. */
4004 if (htab
->elf
.splt
!= NULL
)
4006 if (htab
->plt_bnd
!= NULL
)
4008 resolved_plt
= htab
->plt_bnd
;
4009 plt_offset
= eh
->plt_bnd
.offset
;
4013 resolved_plt
= htab
->elf
.splt
;
4014 plt_offset
= h
->plt
.offset
;
4019 resolved_plt
= htab
->elf
.iplt
;
4020 plt_offset
= h
->plt
.offset
;
4023 relocation
= (resolved_plt
->output_section
->vma
4024 + resolved_plt
->output_offset
+ plt_offset
);
4029 if (h
->root
.root
.string
)
4030 name
= h
->root
.root
.string
;
4032 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4034 (*_bfd_error_handler
)
4035 (_("%B: relocation %s against STT_GNU_IFUNC "
4036 "symbol `%s' isn't handled by %s"), input_bfd
,
4037 x86_64_elf_howto_table
[r_type
].name
,
4038 name
, __FUNCTION__
);
4039 bfd_set_error (bfd_error_bad_value
);
4043 if (bfd_link_pic (info
))
4048 if (ABI_64_P (output_bfd
))
4052 if (rel
->r_addend
!= 0)
4054 if (h
->root
.root
.string
)
4055 name
= h
->root
.root
.string
;
4057 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4059 (*_bfd_error_handler
)
4060 (_("%B: relocation %s against STT_GNU_IFUNC "
4061 "symbol `%s' has non-zero addend: %d"),
4062 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
4063 name
, rel
->r_addend
);
4064 bfd_set_error (bfd_error_bad_value
);
4068 /* Generate dynamic relcoation only when there is a
4069 non-GOT reference in a shared object. */
4070 if (bfd_link_pic (info
) && h
->non_got_ref
)
4072 Elf_Internal_Rela outrel
;
4075 /* Need a dynamic relocation to get the real function
4077 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
4081 if (outrel
.r_offset
== (bfd_vma
) -1
4082 || outrel
.r_offset
== (bfd_vma
) -2)
4085 outrel
.r_offset
+= (input_section
->output_section
->vma
4086 + input_section
->output_offset
);
4088 if (h
->dynindx
== -1
4090 || bfd_link_executable (info
))
4092 /* This symbol is resolved locally. */
4093 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4094 outrel
.r_addend
= (h
->root
.u
.def
.value
4095 + h
->root
.u
.def
.section
->output_section
->vma
4096 + h
->root
.u
.def
.section
->output_offset
);
4100 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4101 outrel
.r_addend
= 0;
4104 sreloc
= htab
->elf
.irelifunc
;
4105 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4107 /* If this reloc is against an external symbol, we
4108 do not want to fiddle with the addend. Otherwise,
4109 we need to include the symbol value so that it
4110 becomes an addend for the dynamic reloc. For an
4111 internal symbol, we have updated addend. */
4116 case R_X86_64_PC32_BND
:
4118 case R_X86_64_PLT32
:
4119 case R_X86_64_PLT32_BND
:
4122 case R_X86_64_GOTPCREL
:
4123 case R_X86_64_GOTPCRELX
:
4124 case R_X86_64_REX_GOTPCRELX
:
4125 case R_X86_64_GOTPCREL64
:
4126 base_got
= htab
->elf
.sgot
;
4127 off
= h
->got
.offset
;
4129 if (base_got
== NULL
)
4132 if (off
== (bfd_vma
) -1)
4134 /* We can't use h->got.offset here to save state, or
4135 even just remember the offset, as finish_dynamic_symbol
4136 would use that as offset into .got. */
4138 if (htab
->elf
.splt
!= NULL
)
4140 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4141 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4142 base_got
= htab
->elf
.sgotplt
;
4146 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4147 off
= plt_index
* GOT_ENTRY_SIZE
;
4148 base_got
= htab
->elf
.igotplt
;
4151 if (h
->dynindx
== -1
4155 /* This references the local defitionion. We must
4156 initialize this entry in the global offset table.
4157 Since the offset must always be a multiple of 8,
4158 we use the least significant bit to record
4159 whether we have initialized it already.
4161 When doing a dynamic link, we create a .rela.got
4162 relocation entry to initialize the value. This
4163 is done in the finish_dynamic_symbol routine. */
4168 bfd_put_64 (output_bfd
, relocation
,
4169 base_got
->contents
+ off
);
4170 /* Note that this is harmless for the GOTPLT64
4171 case, as -1 | 1 still is -1. */
4177 relocation
= (base_got
->output_section
->vma
4178 + base_got
->output_offset
+ off
);
4184 /* When generating a shared object, the relocations handled here are
4185 copied into the output file to be resolved at run time. */
4188 case R_X86_64_GOT32
:
4189 case R_X86_64_GOT64
:
4190 /* Relocation is to the entry for this symbol in the global
4192 case R_X86_64_GOTPCREL
:
4193 case R_X86_64_GOTPCRELX
:
4194 case R_X86_64_REX_GOTPCRELX
:
4195 case R_X86_64_GOTPCREL64
:
4196 /* Use global offset table entry as symbol value. */
4197 case R_X86_64_GOTPLT64
:
4198 /* This is obsolete and treated the the same as GOT64. */
4199 base_got
= htab
->elf
.sgot
;
4201 if (htab
->elf
.sgot
== NULL
)
4208 off
= h
->got
.offset
;
4210 && h
->plt
.offset
!= (bfd_vma
)-1
4211 && off
== (bfd_vma
)-1)
4213 /* We can't use h->got.offset here to save
4214 state, or even just remember the offset, as
4215 finish_dynamic_symbol would use that as offset into
4217 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4218 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4219 base_got
= htab
->elf
.sgotplt
;
4222 dyn
= htab
->elf
.dynamic_sections_created
;
4224 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4225 || (bfd_link_pic (info
)
4226 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4227 || (ELF_ST_VISIBILITY (h
->other
)
4228 && h
->root
.type
== bfd_link_hash_undefweak
))
4230 /* This is actually a static link, or it is a -Bsymbolic
4231 link and the symbol is defined locally, or the symbol
4232 was forced to be local because of a version file. We
4233 must initialize this entry in the global offset table.
4234 Since the offset must always be a multiple of 8, we
4235 use the least significant bit to record whether we
4236 have initialized it already.
4238 When doing a dynamic link, we create a .rela.got
4239 relocation entry to initialize the value. This is
4240 done in the finish_dynamic_symbol routine. */
4245 bfd_put_64 (output_bfd
, relocation
,
4246 base_got
->contents
+ off
);
4247 /* Note that this is harmless for the GOTPLT64 case,
4248 as -1 | 1 still is -1. */
4253 unresolved_reloc
= FALSE
;
4257 if (local_got_offsets
== NULL
)
4260 off
= local_got_offsets
[r_symndx
];
4262 /* The offset must always be a multiple of 8. We use
4263 the least significant bit to record whether we have
4264 already generated the necessary reloc. */
4269 bfd_put_64 (output_bfd
, relocation
,
4270 base_got
->contents
+ off
);
4272 if (bfd_link_pic (info
))
4275 Elf_Internal_Rela outrel
;
4277 /* We need to generate a R_X86_64_RELATIVE reloc
4278 for the dynamic linker. */
4279 s
= htab
->elf
.srelgot
;
4283 outrel
.r_offset
= (base_got
->output_section
->vma
4284 + base_got
->output_offset
4286 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4287 outrel
.r_addend
= relocation
;
4288 elf_append_rela (output_bfd
, s
, &outrel
);
4291 local_got_offsets
[r_symndx
] |= 1;
4295 if (off
>= (bfd_vma
) -2)
4298 relocation
= base_got
->output_section
->vma
4299 + base_got
->output_offset
+ off
;
4300 if (r_type
!= R_X86_64_GOTPCREL
4301 && r_type
!= R_X86_64_GOTPCRELX
4302 && r_type
!= R_X86_64_REX_GOTPCRELX
4303 && r_type
!= R_X86_64_GOTPCREL64
)
4304 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4305 - htab
->elf
.sgotplt
->output_offset
;
4309 case R_X86_64_GOTOFF64
:
4310 /* Relocation is relative to the start of the global offset
4313 /* Check to make sure it isn't a protected function or data
4314 symbol for shared library since it may not be local when
4315 used as function address or with copy relocation. We also
4316 need to make sure that a symbol is referenced locally. */
4317 if (bfd_link_pic (info
) && h
)
4319 if (!h
->def_regular
)
4323 switch (ELF_ST_VISIBILITY (h
->other
))
4326 v
= _("hidden symbol");
4329 v
= _("internal symbol");
4332 v
= _("protected symbol");
4339 (*_bfd_error_handler
)
4340 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4341 input_bfd
, v
, h
->root
.root
.string
);
4342 bfd_set_error (bfd_error_bad_value
);
4345 else if (!bfd_link_executable (info
)
4346 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4347 && (h
->type
== STT_FUNC
4348 || h
->type
== STT_OBJECT
)
4349 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4351 (*_bfd_error_handler
)
4352 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4354 h
->type
== STT_FUNC
? "function" : "data",
4355 h
->root
.root
.string
);
4356 bfd_set_error (bfd_error_bad_value
);
4361 /* Note that sgot is not involved in this
4362 calculation. We always want the start of .got.plt. If we
4363 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4364 permitted by the ABI, we might have to change this
4366 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4367 + htab
->elf
.sgotplt
->output_offset
;
4370 case R_X86_64_GOTPC32
:
4371 case R_X86_64_GOTPC64
:
4372 /* Use global offset table as symbol value. */
4373 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4374 + htab
->elf
.sgotplt
->output_offset
;
4375 unresolved_reloc
= FALSE
;
4378 case R_X86_64_PLTOFF64
:
4379 /* Relocation is PLT entry relative to GOT. For local
4380 symbols it's the symbol itself relative to GOT. */
4382 /* See PLT32 handling. */
4383 && h
->plt
.offset
!= (bfd_vma
) -1
4384 && htab
->elf
.splt
!= NULL
)
4386 if (htab
->plt_bnd
!= NULL
)
4388 resolved_plt
= htab
->plt_bnd
;
4389 plt_offset
= eh
->plt_bnd
.offset
;
4393 resolved_plt
= htab
->elf
.splt
;
4394 plt_offset
= h
->plt
.offset
;
4397 relocation
= (resolved_plt
->output_section
->vma
4398 + resolved_plt
->output_offset
4400 unresolved_reloc
= FALSE
;
4403 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4404 + htab
->elf
.sgotplt
->output_offset
;
4407 case R_X86_64_PLT32
:
4408 case R_X86_64_PLT32_BND
:
4409 /* Relocation is to the entry for this symbol in the
4410 procedure linkage table. */
4412 /* Resolve a PLT32 reloc against a local symbol directly,
4413 without using the procedure linkage table. */
4417 if ((h
->plt
.offset
== (bfd_vma
) -1
4418 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4419 || htab
->elf
.splt
== NULL
)
4421 /* We didn't make a PLT entry for this symbol. This
4422 happens when statically linking PIC code, or when
4423 using -Bsymbolic. */
4427 if (h
->plt
.offset
!= (bfd_vma
) -1)
4429 if (htab
->plt_bnd
!= NULL
)
4431 resolved_plt
= htab
->plt_bnd
;
4432 plt_offset
= eh
->plt_bnd
.offset
;
4436 resolved_plt
= htab
->elf
.splt
;
4437 plt_offset
= h
->plt
.offset
;
4442 /* Use the GOT PLT. */
4443 resolved_plt
= htab
->plt_got
;
4444 plt_offset
= eh
->plt_got
.offset
;
4447 relocation
= (resolved_plt
->output_section
->vma
4448 + resolved_plt
->output_offset
4450 unresolved_reloc
= FALSE
;
4453 case R_X86_64_SIZE32
:
4454 case R_X86_64_SIZE64
:
4455 /* Set to symbol size. */
4456 relocation
= st_size
;
4462 case R_X86_64_PC32_BND
:
4463 /* Don't complain about -fPIC if the symbol is undefined when
4464 building executable. */
4465 if (bfd_link_pic (info
)
4466 && (input_section
->flags
& SEC_ALLOC
) != 0
4467 && (input_section
->flags
& SEC_READONLY
) != 0
4469 && !(bfd_link_executable (info
)
4470 && h
->root
.type
== bfd_link_hash_undefined
))
4472 bfd_boolean fail
= FALSE
;
4474 = ((r_type
== R_X86_64_PC32
4475 || r_type
== R_X86_64_PC32_BND
)
4476 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4478 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4480 /* Symbol is referenced locally. Make sure it is
4481 defined locally or for a branch. */
4482 fail
= !h
->def_regular
&& !branch
;
4484 else if (!(bfd_link_executable (info
)
4485 && (h
->needs_copy
|| eh
->needs_copy
)))
4487 /* Symbol doesn't need copy reloc and isn't referenced
4488 locally. We only allow branch to symbol with
4489 non-default visibility. */
4491 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4498 const char *pic
= "";
4500 switch (ELF_ST_VISIBILITY (h
->other
))
4503 v
= _("hidden symbol");
4506 v
= _("internal symbol");
4509 v
= _("protected symbol");
4513 pic
= _("; recompile with -fPIC");
4518 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4520 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4522 (*_bfd_error_handler
) (fmt
, input_bfd
,
4523 x86_64_elf_howto_table
[r_type
].name
,
4524 v
, h
->root
.root
.string
, pic
);
4525 bfd_set_error (bfd_error_bad_value
);
4536 /* FIXME: The ABI says the linker should make sure the value is
4537 the same when it's zeroextended to 64 bit. */
4540 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4543 /* Don't copy a pc-relative relocation into the output file
4544 if the symbol needs copy reloc or the symbol is undefined
4545 when building executable. Copy dynamic function pointer
4547 if ((bfd_link_pic (info
)
4548 && !(bfd_link_executable (info
)
4552 || h
->root
.type
== bfd_link_hash_undefined
)
4553 && IS_X86_64_PCREL_TYPE (r_type
))
4555 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4556 || h
->root
.type
!= bfd_link_hash_undefweak
)
4557 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4558 && r_type
!= R_X86_64_SIZE32
4559 && r_type
!= R_X86_64_SIZE64
)
4560 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4561 || (ELIMINATE_COPY_RELOCS
4562 && !bfd_link_pic (info
)
4565 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4568 || h
->root
.type
== bfd_link_hash_undefweak
4569 || h
->root
.type
== bfd_link_hash_undefined
)))
4571 Elf_Internal_Rela outrel
;
4572 bfd_boolean skip
, relocate
;
4575 /* When generating a shared object, these relocations
4576 are copied into the output file to be resolved at run
4582 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4584 if (outrel
.r_offset
== (bfd_vma
) -1)
4586 else if (outrel
.r_offset
== (bfd_vma
) -2)
4587 skip
= TRUE
, relocate
= TRUE
;
4589 outrel
.r_offset
+= (input_section
->output_section
->vma
4590 + input_section
->output_offset
);
4593 memset (&outrel
, 0, sizeof outrel
);
4595 /* h->dynindx may be -1 if this symbol was marked to
4599 && (IS_X86_64_PCREL_TYPE (r_type
)
4600 || ! bfd_link_pic (info
)
4601 || ! SYMBOLIC_BIND (info
, h
)
4602 || ! h
->def_regular
))
4604 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4605 outrel
.r_addend
= rel
->r_addend
;
4609 /* This symbol is local, or marked to become local. */
4610 if (r_type
== htab
->pointer_r_type
)
4613 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4614 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4616 else if (r_type
== R_X86_64_64
4617 && !ABI_64_P (output_bfd
))
4620 outrel
.r_info
= htab
->r_info (0,
4621 R_X86_64_RELATIVE64
);
4622 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4623 /* Check addend overflow. */
4624 if ((outrel
.r_addend
& 0x80000000)
4625 != (rel
->r_addend
& 0x80000000))
4628 int addend
= rel
->r_addend
;
4629 if (h
&& h
->root
.root
.string
)
4630 name
= h
->root
.root
.string
;
4632 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4635 (*_bfd_error_handler
)
4636 (_("%B: addend -0x%x in relocation %s against "
4637 "symbol `%s' at 0x%lx in section `%A' is "
4639 input_bfd
, input_section
, addend
,
4640 x86_64_elf_howto_table
[r_type
].name
,
4641 name
, (unsigned long) rel
->r_offset
);
4643 (*_bfd_error_handler
)
4644 (_("%B: addend 0x%x in relocation %s against "
4645 "symbol `%s' at 0x%lx in section `%A' is "
4647 input_bfd
, input_section
, addend
,
4648 x86_64_elf_howto_table
[r_type
].name
,
4649 name
, (unsigned long) rel
->r_offset
);
4650 bfd_set_error (bfd_error_bad_value
);
4658 if (bfd_is_abs_section (sec
))
4660 else if (sec
== NULL
|| sec
->owner
== NULL
)
4662 bfd_set_error (bfd_error_bad_value
);
4669 /* We are turning this relocation into one
4670 against a section symbol. It would be
4671 proper to subtract the symbol's value,
4672 osec->vma, from the emitted reloc addend,
4673 but ld.so expects buggy relocs. */
4674 osec
= sec
->output_section
;
4675 sindx
= elf_section_data (osec
)->dynindx
;
4678 asection
*oi
= htab
->elf
.text_index_section
;
4679 sindx
= elf_section_data (oi
)->dynindx
;
4681 BFD_ASSERT (sindx
!= 0);
4684 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4685 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4689 sreloc
= elf_section_data (input_section
)->sreloc
;
4691 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4693 r
= bfd_reloc_notsupported
;
4694 goto check_relocation_error
;
4697 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4699 /* If this reloc is against an external symbol, we do
4700 not want to fiddle with the addend. Otherwise, we
4701 need to include the symbol value so that it becomes
4702 an addend for the dynamic reloc. */
4709 case R_X86_64_TLSGD
:
4710 case R_X86_64_GOTPC32_TLSDESC
:
4711 case R_X86_64_TLSDESC_CALL
:
4712 case R_X86_64_GOTTPOFF
:
4713 tls_type
= GOT_UNKNOWN
;
4714 if (h
== NULL
&& local_got_offsets
)
4715 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4717 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4719 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4720 input_section
, contents
,
4721 symtab_hdr
, sym_hashes
,
4722 &r_type
, tls_type
, rel
,
4723 relend
, h
, r_symndx
))
4726 if (r_type
== R_X86_64_TPOFF32
)
4728 bfd_vma roff
= rel
->r_offset
;
4730 BFD_ASSERT (! unresolved_reloc
);
4732 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4734 /* GD->LE transition. For 64bit, change
4735 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4736 .word 0x6666; rex64; call __tls_get_addr
4739 leaq foo@tpoff(%rax), %rax
4741 leaq foo@tlsgd(%rip), %rdi
4742 .word 0x6666; rex64; call __tls_get_addr
4745 leaq foo@tpoff(%rax), %rax
4746 For largepic, change:
4747 leaq foo@tlsgd(%rip), %rdi
4748 movabsq $__tls_get_addr@pltoff, %rax
4753 leaq foo@tpoff(%rax), %rax
4754 nopw 0x0(%rax,%rax,1) */
4756 if (ABI_64_P (output_bfd
)
4757 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4759 memcpy (contents
+ roff
- 3,
4760 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4761 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4764 else if (ABI_64_P (output_bfd
))
4765 memcpy (contents
+ roff
- 4,
4766 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4769 memcpy (contents
+ roff
- 3,
4770 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4772 bfd_put_32 (output_bfd
,
4773 elf_x86_64_tpoff (info
, relocation
),
4774 contents
+ roff
+ 8 + largepic
);
4775 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4779 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4781 /* GDesc -> LE transition.
4782 It's originally something like:
4783 leaq x@tlsdesc(%rip), %rax
4786 movl $x@tpoff, %rax. */
4788 unsigned int val
, type
;
4790 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4791 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4792 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4793 contents
+ roff
- 3);
4794 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4795 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4796 contents
+ roff
- 1);
4797 bfd_put_32 (output_bfd
,
4798 elf_x86_64_tpoff (info
, relocation
),
4802 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4804 /* GDesc -> LE transition.
4809 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4810 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4813 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4815 /* IE->LE transition:
4816 For 64bit, originally it can be one of:
4817 movq foo@gottpoff(%rip), %reg
4818 addq foo@gottpoff(%rip), %reg
4821 leaq foo(%reg), %reg
4823 For 32bit, originally it can be one of:
4824 movq foo@gottpoff(%rip), %reg
4825 addl foo@gottpoff(%rip), %reg
4828 leal foo(%reg), %reg
4831 unsigned int val
, type
, reg
;
4834 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4837 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4838 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4844 bfd_put_8 (output_bfd
, 0x49,
4845 contents
+ roff
- 3);
4846 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4847 bfd_put_8 (output_bfd
, 0x41,
4848 contents
+ roff
- 3);
4849 bfd_put_8 (output_bfd
, 0xc7,
4850 contents
+ roff
- 2);
4851 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4852 contents
+ roff
- 1);
4856 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4859 bfd_put_8 (output_bfd
, 0x49,
4860 contents
+ roff
- 3);
4861 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4862 bfd_put_8 (output_bfd
, 0x41,
4863 contents
+ roff
- 3);
4864 bfd_put_8 (output_bfd
, 0x81,
4865 contents
+ roff
- 2);
4866 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4867 contents
+ roff
- 1);
4871 /* addq/addl -> leaq/leal */
4873 bfd_put_8 (output_bfd
, 0x4d,
4874 contents
+ roff
- 3);
4875 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4876 bfd_put_8 (output_bfd
, 0x45,
4877 contents
+ roff
- 3);
4878 bfd_put_8 (output_bfd
, 0x8d,
4879 contents
+ roff
- 2);
4880 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4881 contents
+ roff
- 1);
4883 bfd_put_32 (output_bfd
,
4884 elf_x86_64_tpoff (info
, relocation
),
4892 if (htab
->elf
.sgot
== NULL
)
4897 off
= h
->got
.offset
;
4898 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4902 if (local_got_offsets
== NULL
)
4905 off
= local_got_offsets
[r_symndx
];
4906 offplt
= local_tlsdesc_gotents
[r_symndx
];
4913 Elf_Internal_Rela outrel
;
4917 if (htab
->elf
.srelgot
== NULL
)
4920 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4922 if (GOT_TLS_GDESC_P (tls_type
))
4924 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4925 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4926 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4927 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4928 + htab
->elf
.sgotplt
->output_offset
4930 + htab
->sgotplt_jump_table_size
);
4931 sreloc
= htab
->elf
.srelplt
;
4933 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4935 outrel
.r_addend
= 0;
4936 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4939 sreloc
= htab
->elf
.srelgot
;
4941 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4942 + htab
->elf
.sgot
->output_offset
+ off
);
4944 if (GOT_TLS_GD_P (tls_type
))
4945 dr_type
= R_X86_64_DTPMOD64
;
4946 else if (GOT_TLS_GDESC_P (tls_type
))
4949 dr_type
= R_X86_64_TPOFF64
;
4951 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4952 outrel
.r_addend
= 0;
4953 if ((dr_type
== R_X86_64_TPOFF64
4954 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4955 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4956 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4958 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4960 if (GOT_TLS_GD_P (tls_type
))
4964 BFD_ASSERT (! unresolved_reloc
);
4965 bfd_put_64 (output_bfd
,
4966 relocation
- elf_x86_64_dtpoff_base (info
),
4967 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4971 bfd_put_64 (output_bfd
, 0,
4972 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4973 outrel
.r_info
= htab
->r_info (indx
,
4975 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4976 elf_append_rela (output_bfd
, sreloc
,
4985 local_got_offsets
[r_symndx
] |= 1;
4988 if (off
>= (bfd_vma
) -2
4989 && ! GOT_TLS_GDESC_P (tls_type
))
4991 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4993 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4994 || r_type
== R_X86_64_TLSDESC_CALL
)
4995 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4996 + htab
->elf
.sgotplt
->output_offset
4997 + offplt
+ htab
->sgotplt_jump_table_size
;
4999 relocation
= htab
->elf
.sgot
->output_section
->vma
5000 + htab
->elf
.sgot
->output_offset
+ off
;
5001 unresolved_reloc
= FALSE
;
5005 bfd_vma roff
= rel
->r_offset
;
5007 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5009 /* GD->IE transition. For 64bit, change
5010 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5011 .word 0x6666; rex64; call __tls_get_addr@plt
5014 addq foo@gottpoff(%rip), %rax
5016 leaq foo@tlsgd(%rip), %rdi
5017 .word 0x6666; rex64; call __tls_get_addr@plt
5020 addq foo@gottpoff(%rip), %rax
5021 For largepic, change:
5022 leaq foo@tlsgd(%rip), %rdi
5023 movabsq $__tls_get_addr@pltoff, %rax
5028 addq foo@gottpoff(%rax), %rax
5029 nopw 0x0(%rax,%rax,1) */
5031 if (ABI_64_P (output_bfd
)
5032 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
5034 memcpy (contents
+ roff
- 3,
5035 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5036 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5039 else if (ABI_64_P (output_bfd
))
5040 memcpy (contents
+ roff
- 4,
5041 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5044 memcpy (contents
+ roff
- 3,
5045 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5048 relocation
= (htab
->elf
.sgot
->output_section
->vma
5049 + htab
->elf
.sgot
->output_offset
+ off
5052 - input_section
->output_section
->vma
5053 - input_section
->output_offset
5055 bfd_put_32 (output_bfd
, relocation
,
5056 contents
+ roff
+ 8 + largepic
);
5057 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5061 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5063 /* GDesc -> IE transition.
5064 It's originally something like:
5065 leaq x@tlsdesc(%rip), %rax
5068 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5070 /* Now modify the instruction as appropriate. To
5071 turn a leaq into a movq in the form we use it, it
5072 suffices to change the second byte from 0x8d to
5074 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
5076 bfd_put_32 (output_bfd
,
5077 htab
->elf
.sgot
->output_section
->vma
5078 + htab
->elf
.sgot
->output_offset
+ off
5080 - input_section
->output_section
->vma
5081 - input_section
->output_offset
5086 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5088 /* GDesc -> IE transition.
5095 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5096 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5104 case R_X86_64_TLSLD
:
5105 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5106 input_section
, contents
,
5107 symtab_hdr
, sym_hashes
,
5108 &r_type
, GOT_UNKNOWN
,
5109 rel
, relend
, h
, r_symndx
))
5112 if (r_type
!= R_X86_64_TLSLD
)
5114 /* LD->LE transition:
5115 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
5116 For 64bit, we change it into:
5117 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
5118 For 32bit, we change it into:
5119 nopl 0x0(%rax); movl %fs:0, %eax.
5120 For largepic, change:
5121 leaq foo@tlsgd(%rip), %rdi
5122 movabsq $__tls_get_addr@pltoff, %rax
5126 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
5129 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
5130 if (ABI_64_P (output_bfd
)
5131 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
5132 memcpy (contents
+ rel
->r_offset
- 3,
5133 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5134 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5135 else if (ABI_64_P (output_bfd
))
5136 memcpy (contents
+ rel
->r_offset
- 3,
5137 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5139 memcpy (contents
+ rel
->r_offset
- 3,
5140 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5141 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5146 if (htab
->elf
.sgot
== NULL
)
5149 off
= htab
->tls_ld_got
.offset
;
5154 Elf_Internal_Rela outrel
;
5156 if (htab
->elf
.srelgot
== NULL
)
5159 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5160 + htab
->elf
.sgot
->output_offset
+ off
);
5162 bfd_put_64 (output_bfd
, 0,
5163 htab
->elf
.sgot
->contents
+ off
);
5164 bfd_put_64 (output_bfd
, 0,
5165 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5166 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5167 outrel
.r_addend
= 0;
5168 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5170 htab
->tls_ld_got
.offset
|= 1;
5172 relocation
= htab
->elf
.sgot
->output_section
->vma
5173 + htab
->elf
.sgot
->output_offset
+ off
;
5174 unresolved_reloc
= FALSE
;
5177 case R_X86_64_DTPOFF32
:
5178 if (!bfd_link_executable (info
)
5179 || (input_section
->flags
& SEC_CODE
) == 0)
5180 relocation
-= elf_x86_64_dtpoff_base (info
);
5182 relocation
= elf_x86_64_tpoff (info
, relocation
);
5185 case R_X86_64_TPOFF32
:
5186 case R_X86_64_TPOFF64
:
5187 BFD_ASSERT (bfd_link_executable (info
));
5188 relocation
= elf_x86_64_tpoff (info
, relocation
);
5191 case R_X86_64_DTPOFF64
:
5192 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5193 relocation
-= elf_x86_64_dtpoff_base (info
);
5200 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5201 because such sections are not SEC_ALLOC and thus ld.so will
5202 not process them. */
5203 if (unresolved_reloc
5204 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5206 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5207 rel
->r_offset
) != (bfd_vma
) -1)
5209 (*_bfd_error_handler
)
5210 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5213 (long) rel
->r_offset
,
5215 h
->root
.root
.string
);
5220 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5221 contents
, rel
->r_offset
,
5222 relocation
, rel
->r_addend
);
5224 check_relocation_error
:
5225 if (r
!= bfd_reloc_ok
)
5230 name
= h
->root
.root
.string
;
5233 name
= bfd_elf_string_from_elf_section (input_bfd
,
5234 symtab_hdr
->sh_link
,
5239 name
= bfd_section_name (input_bfd
, sec
);
5242 if (r
== bfd_reloc_overflow
)
5244 if (! ((*info
->callbacks
->reloc_overflow
)
5245 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5246 (bfd_vma
) 0, input_bfd
, input_section
,
5252 (*_bfd_error_handler
)
5253 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5254 input_bfd
, input_section
,
5255 (long) rel
->r_offset
, name
, (int) r
);
5264 /* Finish up dynamic symbol handling. We set the contents of various
5265 dynamic sections here. */
5268 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5269 struct bfd_link_info
*info
,
5270 struct elf_link_hash_entry
*h
,
5271 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5273 struct elf_x86_64_link_hash_table
*htab
;
5274 const struct elf_x86_64_backend_data
*abed
;
5275 bfd_boolean use_plt_bnd
;
5276 struct elf_x86_64_link_hash_entry
*eh
;
5278 htab
= elf_x86_64_hash_table (info
);
5282 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5283 section only if there is .plt section. */
5284 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5286 ? &elf_x86_64_bnd_arch_bed
5287 : get_elf_x86_64_backend_data (output_bfd
));
5289 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5291 if (h
->plt
.offset
!= (bfd_vma
) -1)
5294 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5295 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5296 Elf_Internal_Rela rela
;
5298 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5299 const struct elf_backend_data
*bed
;
5300 bfd_vma plt_got_pcrel_offset
;
5302 /* When building a static executable, use .iplt, .igot.plt and
5303 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5304 if (htab
->elf
.splt
!= NULL
)
5306 plt
= htab
->elf
.splt
;
5307 gotplt
= htab
->elf
.sgotplt
;
5308 relplt
= htab
->elf
.srelplt
;
5312 plt
= htab
->elf
.iplt
;
5313 gotplt
= htab
->elf
.igotplt
;
5314 relplt
= htab
->elf
.irelplt
;
5317 /* This symbol has an entry in the procedure linkage table. Set
5319 if ((h
->dynindx
== -1
5320 && !((h
->forced_local
|| bfd_link_executable (info
))
5322 && h
->type
== STT_GNU_IFUNC
))
5328 /* Get the index in the procedure linkage table which
5329 corresponds to this symbol. This is the index of this symbol
5330 in all the symbols for which we are making plt entries. The
5331 first entry in the procedure linkage table is reserved.
5333 Get the offset into the .got table of the entry that
5334 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5335 bytes. The first three are reserved for the dynamic linker.
5337 For static executables, we don't reserve anything. */
5339 if (plt
== htab
->elf
.splt
)
5341 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5342 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5346 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5347 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5350 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5351 plt_plt_offset
= abed
->plt_plt_offset
;
5352 plt_got_insn_size
= abed
->plt_got_insn_size
;
5353 plt_got_offset
= abed
->plt_got_offset
;
5356 /* Use the second PLT with BND relocations. */
5357 const bfd_byte
*plt_entry
, *plt2_entry
;
5359 if (eh
->has_bnd_reloc
)
5361 plt_entry
= elf_x86_64_bnd_plt_entry
;
5362 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5366 plt_entry
= elf_x86_64_legacy_plt_entry
;
5367 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5369 /* Subtract 1 since there is no BND prefix. */
5370 plt_plt_insn_end
-= 1;
5371 plt_plt_offset
-= 1;
5372 plt_got_insn_size
-= 1;
5373 plt_got_offset
-= 1;
5376 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5377 == sizeof (elf_x86_64_legacy_plt_entry
));
5379 /* Fill in the entry in the procedure linkage table. */
5380 memcpy (plt
->contents
+ h
->plt
.offset
,
5381 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5382 /* Fill in the entry in the second PLT. */
5383 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5384 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5386 resolved_plt
= htab
->plt_bnd
;
5387 plt_offset
= eh
->plt_bnd
.offset
;
5391 /* Fill in the entry in the procedure linkage table. */
5392 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5393 abed
->plt_entry_size
);
5396 plt_offset
= h
->plt
.offset
;
5399 /* Insert the relocation positions of the plt section. */
5401 /* Put offset the PC-relative instruction referring to the GOT entry,
5402 subtracting the size of that instruction. */
5403 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5404 + gotplt
->output_offset
5406 - resolved_plt
->output_section
->vma
5407 - resolved_plt
->output_offset
5409 - plt_got_insn_size
);
5411 /* Check PC-relative offset overflow in PLT entry. */
5412 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5413 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5414 output_bfd
, h
->root
.root
.string
);
5416 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5417 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5419 /* Fill in the entry in the global offset table, initially this
5420 points to the second part of the PLT entry. */
5421 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5422 + plt
->output_offset
5423 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5424 gotplt
->contents
+ got_offset
);
5426 /* Fill in the entry in the .rela.plt section. */
5427 rela
.r_offset
= (gotplt
->output_section
->vma
5428 + gotplt
->output_offset
5430 if (h
->dynindx
== -1
5431 || ((bfd_link_executable (info
)
5432 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5434 && h
->type
== STT_GNU_IFUNC
))
5436 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5437 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5438 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5439 rela
.r_addend
= (h
->root
.u
.def
.value
5440 + h
->root
.u
.def
.section
->output_section
->vma
5441 + h
->root
.u
.def
.section
->output_offset
);
5442 /* R_X86_64_IRELATIVE comes last. */
5443 plt_index
= htab
->next_irelative_index
--;
5447 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5449 plt_index
= htab
->next_jump_slot_index
++;
5452 /* Don't fill PLT entry for static executables. */
5453 if (plt
== htab
->elf
.splt
)
5455 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5457 /* Put relocation index. */
5458 bfd_put_32 (output_bfd
, plt_index
,
5459 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5461 /* Put offset for jmp .PLT0 and check for overflow. We don't
5462 check relocation index for overflow since branch displacement
5463 will overflow first. */
5464 if (plt0_offset
> 0x80000000)
5465 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5466 output_bfd
, h
->root
.root
.string
);
5467 bfd_put_32 (output_bfd
, - plt0_offset
,
5468 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5471 bed
= get_elf_backend_data (output_bfd
);
5472 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5473 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5475 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5477 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5478 asection
*plt
, *got
;
5479 bfd_boolean got_after_plt
;
5480 int32_t got_pcrel_offset
;
5481 const bfd_byte
*got_plt_entry
;
5483 /* Set the entry in the GOT procedure linkage table. */
5484 plt
= htab
->plt_got
;
5485 got
= htab
->elf
.sgot
;
5486 got_offset
= h
->got
.offset
;
5488 if (got_offset
== (bfd_vma
) -1
5489 || h
->type
== STT_GNU_IFUNC
5494 /* Use the second PLT entry template for the GOT PLT since they
5495 are the identical. */
5496 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5497 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5498 if (eh
->has_bnd_reloc
)
5499 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5502 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5504 /* Subtract 1 since there is no BND prefix. */
5505 plt_got_insn_size
-= 1;
5506 plt_got_offset
-= 1;
5509 /* Fill in the entry in the GOT procedure linkage table. */
5510 plt_offset
= eh
->plt_got
.offset
;
5511 memcpy (plt
->contents
+ plt_offset
,
5512 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5514 /* Put offset the PC-relative instruction referring to the GOT
5515 entry, subtracting the size of that instruction. */
5516 got_pcrel_offset
= (got
->output_section
->vma
5517 + got
->output_offset
5519 - plt
->output_section
->vma
5520 - plt
->output_offset
5522 - plt_got_insn_size
);
5524 /* Check PC-relative offset overflow in GOT PLT entry. */
5525 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5526 if ((got_after_plt
&& got_pcrel_offset
< 0)
5527 || (!got_after_plt
&& got_pcrel_offset
> 0))
5528 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5529 output_bfd
, h
->root
.root
.string
);
5531 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5532 plt
->contents
+ plt_offset
+ plt_got_offset
);
5536 && (h
->plt
.offset
!= (bfd_vma
) -1
5537 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5539 /* Mark the symbol as undefined, rather than as defined in
5540 the .plt section. Leave the value if there were any
5541 relocations where pointer equality matters (this is a clue
5542 for the dynamic linker, to make function pointer
5543 comparisons work between an application and shared
5544 library), otherwise set it to zero. If a function is only
5545 called from a binary, there is no need to slow down
5546 shared libraries because of that. */
5547 sym
->st_shndx
= SHN_UNDEF
;
5548 if (!h
->pointer_equality_needed
)
5552 if (h
->got
.offset
!= (bfd_vma
) -1
5553 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5554 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5556 Elf_Internal_Rela rela
;
5558 /* This symbol has an entry in the global offset table. Set it
5560 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5563 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5564 + htab
->elf
.sgot
->output_offset
5565 + (h
->got
.offset
&~ (bfd_vma
) 1));
5567 /* If this is a static link, or it is a -Bsymbolic link and the
5568 symbol is defined locally or was forced to be local because
5569 of a version file, we just want to emit a RELATIVE reloc.
5570 The entry in the global offset table will already have been
5571 initialized in the relocate_section function. */
5573 && h
->type
== STT_GNU_IFUNC
)
5575 if (bfd_link_pic (info
))
5577 /* Generate R_X86_64_GLOB_DAT. */
5584 if (!h
->pointer_equality_needed
)
5587 /* For non-shared object, we can't use .got.plt, which
5588 contains the real function addres if we need pointer
5589 equality. We load the GOT entry with the PLT entry. */
5590 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5591 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5592 + plt
->output_offset
5594 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5598 else if (bfd_link_pic (info
)
5599 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5601 if (!h
->def_regular
)
5603 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5604 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5605 rela
.r_addend
= (h
->root
.u
.def
.value
5606 + h
->root
.u
.def
.section
->output_section
->vma
5607 + h
->root
.u
.def
.section
->output_offset
);
5611 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5613 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5614 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5615 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5619 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5624 Elf_Internal_Rela rela
;
5626 /* This symbol needs a copy reloc. Set it up. */
5628 if (h
->dynindx
== -1
5629 || (h
->root
.type
!= bfd_link_hash_defined
5630 && h
->root
.type
!= bfd_link_hash_defweak
)
5631 || htab
->srelbss
== NULL
)
5634 rela
.r_offset
= (h
->root
.u
.def
.value
5635 + h
->root
.u
.def
.section
->output_section
->vma
5636 + h
->root
.u
.def
.section
->output_offset
);
5637 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5639 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5645 /* Finish up local dynamic symbol handling. We set the contents of
5646 various dynamic sections here. */
5649 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5651 struct elf_link_hash_entry
*h
5652 = (struct elf_link_hash_entry
*) *slot
;
5653 struct bfd_link_info
*info
5654 = (struct bfd_link_info
*) inf
;
5656 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5660 /* Used to decide how to sort relocs in an optimal manner for the
5661 dynamic linker, before writing them out. */
5663 static enum elf_reloc_type_class
5664 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
5665 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5666 const Elf_Internal_Rela
*rela
)
5668 bfd
*abfd
= info
->output_bfd
;
5669 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5670 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
5671 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
5672 Elf_Internal_Sym sym
;
5674 if (htab
->elf
.dynsym
== NULL
5675 || !bed
->s
->swap_symbol_in (abfd
,
5676 (htab
->elf
.dynsym
->contents
5677 + r_symndx
* bed
->s
->sizeof_sym
),
5681 /* Check relocation against STT_GNU_IFUNC symbol. */
5682 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5683 return reloc_class_ifunc
;
5685 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5687 case R_X86_64_RELATIVE
:
5688 case R_X86_64_RELATIVE64
:
5689 return reloc_class_relative
;
5690 case R_X86_64_JUMP_SLOT
:
5691 return reloc_class_plt
;
5693 return reloc_class_copy
;
5695 return reloc_class_normal
;
5699 /* Finish up the dynamic sections. */
5702 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5703 struct bfd_link_info
*info
)
5705 struct elf_x86_64_link_hash_table
*htab
;
5708 const struct elf_x86_64_backend_data
*abed
;
5710 htab
= elf_x86_64_hash_table (info
);
5714 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5715 section only if there is .plt section. */
5716 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5717 ? &elf_x86_64_bnd_arch_bed
5718 : get_elf_x86_64_backend_data (output_bfd
));
5720 dynobj
= htab
->elf
.dynobj
;
5721 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5723 if (htab
->elf
.dynamic_sections_created
)
5725 bfd_byte
*dyncon
, *dynconend
;
5726 const struct elf_backend_data
*bed
;
5727 bfd_size_type sizeof_dyn
;
5729 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5732 bed
= get_elf_backend_data (dynobj
);
5733 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5734 dyncon
= sdyn
->contents
;
5735 dynconend
= sdyn
->contents
+ sdyn
->size
;
5736 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5738 Elf_Internal_Dyn dyn
;
5741 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5749 s
= htab
->elf
.sgotplt
;
5750 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5754 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5758 s
= htab
->elf
.srelplt
->output_section
;
5759 dyn
.d_un
.d_val
= s
->size
;
5763 /* The procedure linkage table relocs (DT_JMPREL) should
5764 not be included in the overall relocs (DT_RELA).
5765 Therefore, we override the DT_RELASZ entry here to
5766 make it not include the JMPREL relocs. Since the
5767 linker script arranges for .rela.plt to follow all
5768 other relocation sections, we don't have to worry
5769 about changing the DT_RELA entry. */
5770 if (htab
->elf
.srelplt
!= NULL
)
5772 s
= htab
->elf
.srelplt
->output_section
;
5773 dyn
.d_un
.d_val
-= s
->size
;
5777 case DT_TLSDESC_PLT
:
5779 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5780 + htab
->tlsdesc_plt
;
5783 case DT_TLSDESC_GOT
:
5785 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5786 + htab
->tlsdesc_got
;
5790 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5793 /* Fill in the special first entry in the procedure linkage table. */
5794 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5796 /* Fill in the first entry in the procedure linkage table. */
5797 memcpy (htab
->elf
.splt
->contents
,
5798 abed
->plt0_entry
, abed
->plt_entry_size
);
5799 /* Add offset for pushq GOT+8(%rip), since the instruction
5800 uses 6 bytes subtract this value. */
5801 bfd_put_32 (output_bfd
,
5802 (htab
->elf
.sgotplt
->output_section
->vma
5803 + htab
->elf
.sgotplt
->output_offset
5805 - htab
->elf
.splt
->output_section
->vma
5806 - htab
->elf
.splt
->output_offset
5808 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5809 /* Add offset for the PC-relative instruction accessing GOT+16,
5810 subtracting the offset to the end of that instruction. */
5811 bfd_put_32 (output_bfd
,
5812 (htab
->elf
.sgotplt
->output_section
->vma
5813 + htab
->elf
.sgotplt
->output_offset
5815 - htab
->elf
.splt
->output_section
->vma
5816 - htab
->elf
.splt
->output_offset
5817 - abed
->plt0_got2_insn_end
),
5818 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5820 elf_section_data (htab
->elf
.splt
->output_section
)
5821 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5823 if (htab
->tlsdesc_plt
)
5825 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5826 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5828 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5829 abed
->plt0_entry
, abed
->plt_entry_size
);
5831 /* Add offset for pushq GOT+8(%rip), since the
5832 instruction uses 6 bytes subtract this value. */
5833 bfd_put_32 (output_bfd
,
5834 (htab
->elf
.sgotplt
->output_section
->vma
5835 + htab
->elf
.sgotplt
->output_offset
5837 - htab
->elf
.splt
->output_section
->vma
5838 - htab
->elf
.splt
->output_offset
5841 htab
->elf
.splt
->contents
5842 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5843 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5844 where TGD stands for htab->tlsdesc_got, subtracting the offset
5845 to the end of that instruction. */
5846 bfd_put_32 (output_bfd
,
5847 (htab
->elf
.sgot
->output_section
->vma
5848 + htab
->elf
.sgot
->output_offset
5850 - htab
->elf
.splt
->output_section
->vma
5851 - htab
->elf
.splt
->output_offset
5853 - abed
->plt0_got2_insn_end
),
5854 htab
->elf
.splt
->contents
5855 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5860 if (htab
->plt_bnd
!= NULL
)
5861 elf_section_data (htab
->plt_bnd
->output_section
)
5862 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5864 if (htab
->elf
.sgotplt
)
5866 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5868 (*_bfd_error_handler
)
5869 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5873 /* Fill in the first three entries in the global offset table. */
5874 if (htab
->elf
.sgotplt
->size
> 0)
5876 /* Set the first entry in the global offset table to the address of
5877 the dynamic section. */
5879 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5881 bfd_put_64 (output_bfd
,
5882 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5883 htab
->elf
.sgotplt
->contents
);
5884 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5885 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5886 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5889 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5893 /* Adjust .eh_frame for .plt section. */
5894 if (htab
->plt_eh_frame
!= NULL
5895 && htab
->plt_eh_frame
->contents
!= NULL
)
5897 if (htab
->elf
.splt
!= NULL
5898 && htab
->elf
.splt
->size
!= 0
5899 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5900 && htab
->elf
.splt
->output_section
!= NULL
5901 && htab
->plt_eh_frame
->output_section
!= NULL
)
5903 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5904 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5905 + htab
->plt_eh_frame
->output_offset
5906 + PLT_FDE_START_OFFSET
;
5907 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5908 htab
->plt_eh_frame
->contents
5909 + PLT_FDE_START_OFFSET
);
5911 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5913 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5915 htab
->plt_eh_frame
->contents
))
5920 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5921 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5924 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5925 htab_traverse (htab
->loc_hash_table
,
5926 elf_x86_64_finish_local_dynamic_symbol
,
5932 /* Return an array of PLT entry symbol values. */
5935 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
5938 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5941 bfd_vma
*plt_sym_val
;
5943 bfd_byte
*plt_contents
;
5944 const struct elf_x86_64_backend_data
*bed
;
5945 Elf_Internal_Shdr
*hdr
;
5948 /* Get the .plt section contents. PLT passed down may point to the
5949 .plt.bnd section. Make sure that PLT always points to the .plt
5951 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5956 plt
= bfd_get_section_by_name (abfd
, ".plt");
5959 bed
= &elf_x86_64_bnd_arch_bed
;
5962 bed
= get_elf_x86_64_backend_data (abfd
);
5964 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
5965 if (plt_contents
== NULL
)
5967 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5968 plt_contents
, 0, plt
->size
))
5971 free (plt_contents
);
5975 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
5976 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
5979 hdr
= &elf_section_data (relplt
)->this_hdr
;
5980 count
= relplt
->size
/ hdr
->sh_entsize
;
5982 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
5983 if (plt_sym_val
== NULL
)
5986 for (i
= 0; i
< count
; i
++)
5987 plt_sym_val
[i
] = -1;
5989 plt_offset
= bed
->plt_entry_size
;
5990 p
= relplt
->relocation
;
5991 for (i
= 0; i
< count
; i
++, p
++)
5995 /* Skip unknown relocation. */
5996 if (p
->howto
== NULL
)
5999 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
6000 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
6003 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
6004 + bed
->plt_reloc_offset
));
6005 if (reloc_index
>= count
)
6009 /* This is the index in .plt section. */
6010 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
6011 /* Store VMA + the offset in .plt.bnd section. */
6012 plt_sym_val
[reloc_index
] =
6014 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
6017 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
6018 plt_offset
+= bed
->plt_entry_size
;
6020 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6022 if (plt_offset
>= plt
->size
)
6026 free (plt_contents
);
6031 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6035 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
6042 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6043 as PLT if it exists. */
6044 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6046 plt
= bfd_get_section_by_name (abfd
, ".plt");
6047 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
6048 dynsymcount
, dynsyms
, ret
,
6050 elf_x86_64_get_plt_sym_val
);
6053 /* Handle an x86-64 specific section when reading an object file. This
6054 is called when elfcode.h finds a section with an unknown type. */
6057 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
6058 const char *name
, int shindex
)
6060 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
6063 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
6069 /* Hook called by the linker routine which adds symbols from an object
6070 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6074 elf_x86_64_add_symbol_hook (bfd
*abfd
,
6075 struct bfd_link_info
*info
,
6076 Elf_Internal_Sym
*sym
,
6077 const char **namep ATTRIBUTE_UNUSED
,
6078 flagword
*flagsp ATTRIBUTE_UNUSED
,
6084 switch (sym
->st_shndx
)
6086 case SHN_X86_64_LCOMMON
:
6087 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
6090 lcomm
= bfd_make_section_with_flags (abfd
,
6094 | SEC_LINKER_CREATED
));
6097 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
6100 *valp
= sym
->st_size
;
6104 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
6105 && (abfd
->flags
& DYNAMIC
) == 0
6106 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
6107 elf_tdata (info
->output_bfd
)->has_gnu_symbols
6108 |= elf_gnu_symbol_unique
;
6114 /* Given a BFD section, try to locate the corresponding ELF section
6118 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
6119 asection
*sec
, int *index_return
)
6121 if (sec
== &_bfd_elf_large_com_section
)
6123 *index_return
= SHN_X86_64_LCOMMON
;
6129 /* Process a symbol. */
6132 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
6135 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
6137 switch (elfsym
->internal_elf_sym
.st_shndx
)
6139 case SHN_X86_64_LCOMMON
:
6140 asym
->section
= &_bfd_elf_large_com_section
;
6141 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6142 /* Common symbol doesn't set BSF_GLOBAL. */
6143 asym
->flags
&= ~BSF_GLOBAL
;
6149 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6151 return (sym
->st_shndx
== SHN_COMMON
6152 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6156 elf_x86_64_common_section_index (asection
*sec
)
6158 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6161 return SHN_X86_64_LCOMMON
;
6165 elf_x86_64_common_section (asection
*sec
)
6167 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6168 return bfd_com_section_ptr
;
6170 return &_bfd_elf_large_com_section
;
6174 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6175 const Elf_Internal_Sym
*sym
,
6180 const asection
*oldsec
)
6182 /* A normal common symbol and a large common symbol result in a
6183 normal common symbol. We turn the large common symbol into a
6186 && h
->root
.type
== bfd_link_hash_common
6188 && bfd_is_com_section (*psec
)
6191 if (sym
->st_shndx
== SHN_COMMON
6192 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6194 h
->root
.u
.c
.p
->section
6195 = bfd_make_section_old_way (oldbfd
, "COMMON");
6196 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6198 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6199 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6200 *psec
= bfd_com_section_ptr
;
6207 elf_x86_64_additional_program_headers (bfd
*abfd
,
6208 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6213 /* Check to see if we need a large readonly segment. */
6214 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6215 if (s
&& (s
->flags
& SEC_LOAD
))
6218 /* Check to see if we need a large data segment. Since .lbss sections
6219 is placed right after the .bss section, there should be no need for
6220 a large data segment just because of .lbss. */
6221 s
= bfd_get_section_by_name (abfd
, ".ldata");
6222 if (s
&& (s
->flags
& SEC_LOAD
))
6228 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6231 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6233 if (h
->plt
.offset
!= (bfd_vma
) -1
6235 && !h
->pointer_equality_needed
)
6238 return _bfd_elf_hash_symbol (h
);
6241 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6244 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6245 const bfd_target
*output
)
6247 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6248 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6249 && _bfd_elf_relocs_compatible (input
, output
));
6252 static const struct bfd_elf_special_section
6253 elf_x86_64_special_sections
[]=
6255 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6256 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6257 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6258 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6259 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6260 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6261 { NULL
, 0, 0, 0, 0 }
6264 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6265 #define TARGET_LITTLE_NAME "elf64-x86-64"
6266 #define ELF_ARCH bfd_arch_i386
6267 #define ELF_TARGET_ID X86_64_ELF_DATA
6268 #define ELF_MACHINE_CODE EM_X86_64
6269 #define ELF_MAXPAGESIZE 0x200000
6270 #define ELF_MINPAGESIZE 0x1000
6271 #define ELF_COMMONPAGESIZE 0x1000
6273 #define elf_backend_can_gc_sections 1
6274 #define elf_backend_can_refcount 1
6275 #define elf_backend_want_got_plt 1
6276 #define elf_backend_plt_readonly 1
6277 #define elf_backend_want_plt_sym 0
6278 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6279 #define elf_backend_rela_normal 1
6280 #define elf_backend_plt_alignment 4
6281 #define elf_backend_extern_protected_data 1
6283 #define elf_info_to_howto elf_x86_64_info_to_howto
6285 #define bfd_elf64_bfd_link_hash_table_create \
6286 elf_x86_64_link_hash_table_create
6287 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6288 #define bfd_elf64_bfd_reloc_name_lookup \
6289 elf_x86_64_reloc_name_lookup
6291 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6292 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6293 #define elf_backend_check_relocs elf_x86_64_check_relocs
6294 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6295 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6296 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6297 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6298 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6299 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6300 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6301 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6303 #define elf_backend_write_core_note elf_x86_64_write_core_note
6305 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6306 #define elf_backend_relocate_section elf_x86_64_relocate_section
6307 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6308 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6309 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6310 #define elf_backend_object_p elf64_x86_64_elf_object_p
6311 #define bfd_elf64_mkobject elf_x86_64_mkobject
6312 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6314 #define elf_backend_section_from_shdr \
6315 elf_x86_64_section_from_shdr
6317 #define elf_backend_section_from_bfd_section \
6318 elf_x86_64_elf_section_from_bfd_section
6319 #define elf_backend_add_symbol_hook \
6320 elf_x86_64_add_symbol_hook
6321 #define elf_backend_symbol_processing \
6322 elf_x86_64_symbol_processing
6323 #define elf_backend_common_section_index \
6324 elf_x86_64_common_section_index
6325 #define elf_backend_common_section \
6326 elf_x86_64_common_section
6327 #define elf_backend_common_definition \
6328 elf_x86_64_common_definition
6329 #define elf_backend_merge_symbol \
6330 elf_x86_64_merge_symbol
6331 #define elf_backend_special_sections \
6332 elf_x86_64_special_sections
6333 #define elf_backend_additional_program_headers \
6334 elf_x86_64_additional_program_headers
6335 #define elf_backend_hash_symbol \
6336 elf_x86_64_hash_symbol
6338 #include "elf64-target.h"
6340 /* CloudABI support. */
6342 #undef TARGET_LITTLE_SYM
6343 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6344 #undef TARGET_LITTLE_NAME
6345 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6348 #define ELF_OSABI ELFOSABI_CLOUDABI
6351 #define elf64_bed elf64_x86_64_cloudabi_bed
6353 #include "elf64-target.h"
6355 /* FreeBSD support. */
6357 #undef TARGET_LITTLE_SYM
6358 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6359 #undef TARGET_LITTLE_NAME
6360 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6363 #define ELF_OSABI ELFOSABI_FREEBSD
6366 #define elf64_bed elf64_x86_64_fbsd_bed
6368 #include "elf64-target.h"
6370 /* Solaris 2 support. */
6372 #undef TARGET_LITTLE_SYM
6373 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6374 #undef TARGET_LITTLE_NAME
6375 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6377 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6378 objects won't be recognized. */
6382 #define elf64_bed elf64_x86_64_sol2_bed
6384 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6386 #undef elf_backend_static_tls_alignment
6387 #define elf_backend_static_tls_alignment 16
6389 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6391 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6393 #undef elf_backend_want_plt_sym
6394 #define elf_backend_want_plt_sym 1
6396 #include "elf64-target.h"
6398 /* Native Client support. */
6401 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6403 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6404 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6408 #undef TARGET_LITTLE_SYM
6409 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6410 #undef TARGET_LITTLE_NAME
6411 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6413 #define elf64_bed elf64_x86_64_nacl_bed
6415 #undef ELF_MAXPAGESIZE
6416 #undef ELF_MINPAGESIZE
6417 #undef ELF_COMMONPAGESIZE
6418 #define ELF_MAXPAGESIZE 0x10000
6419 #define ELF_MINPAGESIZE 0x10000
6420 #define ELF_COMMONPAGESIZE 0x10000
6422 /* Restore defaults. */
6424 #undef elf_backend_static_tls_alignment
6425 #undef elf_backend_want_plt_sym
6426 #define elf_backend_want_plt_sym 0
6428 /* NaCl uses substantially different PLT entries for the same effects. */
6430 #undef elf_backend_plt_alignment
6431 #define elf_backend_plt_alignment 5
6432 #define NACL_PLT_ENTRY_SIZE 64
6433 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6435 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6437 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6438 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6439 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6440 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6441 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6443 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6444 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6446 /* 32 bytes of nop to pad out to the standard size. */
6447 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6448 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6449 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6450 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6451 0x66, /* excess data32 prefix */
6455 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6457 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6458 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6459 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6460 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6462 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6463 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6464 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6466 /* Lazy GOT entries point here (32-byte aligned). */
6467 0x68, /* pushq immediate */
6468 0, 0, 0, 0, /* replaced with index into relocation table. */
6469 0xe9, /* jmp relative */
6470 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6472 /* 22 bytes of nop to pad out to the standard size. */
6473 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6474 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6475 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6478 /* .eh_frame covering the .plt section. */
6480 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6482 #if (PLT_CIE_LENGTH != 20 \
6483 || PLT_FDE_LENGTH != 36 \
6484 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6485 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6486 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6488 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6489 0, 0, 0, 0, /* CIE ID */
6490 1, /* CIE version */
6491 'z', 'R', 0, /* Augmentation string */
6492 1, /* Code alignment factor */
6493 0x78, /* Data alignment factor */
6494 16, /* Return address column */
6495 1, /* Augmentation size */
6496 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6497 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6498 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6499 DW_CFA_nop
, DW_CFA_nop
,
6501 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6502 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6503 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6504 0, 0, 0, 0, /* .plt size goes here */
6505 0, /* Augmentation size */
6506 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6507 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6508 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6509 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6510 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6511 13, /* Block length */
6512 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6513 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6514 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6515 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6516 DW_CFA_nop
, DW_CFA_nop
6519 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6521 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6522 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6523 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6524 2, /* plt0_got1_offset */
6525 9, /* plt0_got2_offset */
6526 13, /* plt0_got2_insn_end */
6527 3, /* plt_got_offset */
6528 33, /* plt_reloc_offset */
6529 38, /* plt_plt_offset */
6530 7, /* plt_got_insn_size */
6531 42, /* plt_plt_insn_end */
6532 32, /* plt_lazy_offset */
6533 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6534 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6537 #undef elf_backend_arch_data
6538 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6540 #undef elf_backend_object_p
6541 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6542 #undef elf_backend_modify_segment_map
6543 #define elf_backend_modify_segment_map nacl_modify_segment_map
6544 #undef elf_backend_modify_program_headers
6545 #define elf_backend_modify_program_headers nacl_modify_program_headers
6546 #undef elf_backend_final_write_processing
6547 #define elf_backend_final_write_processing nacl_final_write_processing
6549 #include "elf64-target.h"
6551 /* Native Client x32 support. */
6554 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6556 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6557 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6561 #undef TARGET_LITTLE_SYM
6562 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6563 #undef TARGET_LITTLE_NAME
6564 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6566 #define elf32_bed elf32_x86_64_nacl_bed
6568 #define bfd_elf32_bfd_link_hash_table_create \
6569 elf_x86_64_link_hash_table_create
6570 #define bfd_elf32_bfd_reloc_type_lookup \
6571 elf_x86_64_reloc_type_lookup
6572 #define bfd_elf32_bfd_reloc_name_lookup \
6573 elf_x86_64_reloc_name_lookup
6574 #define bfd_elf32_mkobject \
6576 #define bfd_elf32_get_synthetic_symtab \
6577 elf_x86_64_get_synthetic_symtab
6579 #undef elf_backend_object_p
6580 #define elf_backend_object_p \
6581 elf32_x86_64_nacl_elf_object_p
6583 #undef elf_backend_bfd_from_remote_memory
6584 #define elf_backend_bfd_from_remote_memory \
6585 _bfd_elf32_bfd_from_remote_memory
6587 #undef elf_backend_size_info
6588 #define elf_backend_size_info \
6589 _bfd_elf32_size_info
6591 #include "elf32-target.h"
6593 /* Restore defaults. */
6594 #undef elf_backend_object_p
6595 #define elf_backend_object_p elf64_x86_64_elf_object_p
6596 #undef elf_backend_bfd_from_remote_memory
6597 #undef elf_backend_size_info
6598 #undef elf_backend_modify_segment_map
6599 #undef elf_backend_modify_program_headers
6600 #undef elf_backend_final_write_processing
6602 /* Intel L1OM support. */
6605 elf64_l1om_elf_object_p (bfd
*abfd
)
6607 /* Set the right machine number for an L1OM elf64 file. */
6608 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6612 #undef TARGET_LITTLE_SYM
6613 #define TARGET_LITTLE_SYM l1om_elf64_vec
6614 #undef TARGET_LITTLE_NAME
6615 #define TARGET_LITTLE_NAME "elf64-l1om"
6617 #define ELF_ARCH bfd_arch_l1om
6619 #undef ELF_MACHINE_CODE
6620 #define ELF_MACHINE_CODE EM_L1OM
6625 #define elf64_bed elf64_l1om_bed
6627 #undef elf_backend_object_p
6628 #define elf_backend_object_p elf64_l1om_elf_object_p
6630 /* Restore defaults. */
6631 #undef ELF_MAXPAGESIZE
6632 #undef ELF_MINPAGESIZE
6633 #undef ELF_COMMONPAGESIZE
6634 #define ELF_MAXPAGESIZE 0x200000
6635 #define ELF_MINPAGESIZE 0x1000
6636 #define ELF_COMMONPAGESIZE 0x1000
6637 #undef elf_backend_plt_alignment
6638 #define elf_backend_plt_alignment 4
6639 #undef elf_backend_arch_data
6640 #define elf_backend_arch_data &elf_x86_64_arch_bed
6642 #include "elf64-target.h"
6644 /* FreeBSD L1OM support. */
6646 #undef TARGET_LITTLE_SYM
6647 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6648 #undef TARGET_LITTLE_NAME
6649 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6652 #define ELF_OSABI ELFOSABI_FREEBSD
6655 #define elf64_bed elf64_l1om_fbsd_bed
6657 #include "elf64-target.h"
6659 /* Intel K1OM support. */
6662 elf64_k1om_elf_object_p (bfd
*abfd
)
6664 /* Set the right machine number for an K1OM elf64 file. */
6665 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6669 #undef TARGET_LITTLE_SYM
6670 #define TARGET_LITTLE_SYM k1om_elf64_vec
6671 #undef TARGET_LITTLE_NAME
6672 #define TARGET_LITTLE_NAME "elf64-k1om"
6674 #define ELF_ARCH bfd_arch_k1om
6676 #undef ELF_MACHINE_CODE
6677 #define ELF_MACHINE_CODE EM_K1OM
6682 #define elf64_bed elf64_k1om_bed
6684 #undef elf_backend_object_p
6685 #define elf_backend_object_p elf64_k1om_elf_object_p
6687 #undef elf_backend_static_tls_alignment
6689 #undef elf_backend_want_plt_sym
6690 #define elf_backend_want_plt_sym 0
6692 #include "elf64-target.h"
6694 /* FreeBSD K1OM support. */
6696 #undef TARGET_LITTLE_SYM
6697 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6698 #undef TARGET_LITTLE_NAME
6699 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6702 #define ELF_OSABI ELFOSABI_FREEBSD
6705 #define elf64_bed elf64_k1om_fbsd_bed
6707 #include "elf64-target.h"
6709 /* 32bit x86-64 support. */
6711 #undef TARGET_LITTLE_SYM
6712 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6713 #undef TARGET_LITTLE_NAME
6714 #define TARGET_LITTLE_NAME "elf32-x86-64"
6718 #define ELF_ARCH bfd_arch_i386
6720 #undef ELF_MACHINE_CODE
6721 #define ELF_MACHINE_CODE EM_X86_64
6725 #undef elf_backend_object_p
6726 #define elf_backend_object_p \
6727 elf32_x86_64_elf_object_p
6729 #undef elf_backend_bfd_from_remote_memory
6730 #define elf_backend_bfd_from_remote_memory \
6731 _bfd_elf32_bfd_from_remote_memory
6733 #undef elf_backend_size_info
6734 #define elf_backend_size_info \
6735 _bfd_elf32_size_info
6737 #include "elf32-target.h"