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
->root
.type
== bfd_link_hash_new
)
3133 && h
->type
!= STT_GNU_IFUNC
3134 && h
!= htab
->elf
.hdynamic
3135 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3137 /* bfd_link_hash_new is set by an assignment in a linker
3138 script in bfd_elf_record_link_assignment. FIXME: If
3139 we ever get a linker error due relocation overflow, we
3140 will skip this optimization. */
3141 if (h
->root
.type
== bfd_link_hash_new
)
3143 tsec
= h
->root
.u
.def
.section
;
3144 toff
= h
->root
.u
.def
.value
;
3151 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3153 /* At this stage in linking, no SEC_MERGE symbol has been
3154 adjusted, so all references to such symbols need to be
3155 passed through _bfd_merged_section_offset. (Later, in
3156 relocate_section, all SEC_MERGE symbols *except* for
3157 section symbols have been adjusted.)
3159 gas may reduce relocations against symbols in SEC_MERGE
3160 sections to a relocation against the section symbol when
3161 the original addend was zero. When the reloc is against
3162 a section symbol we should include the addend in the
3163 offset passed to _bfd_merged_section_offset, since the
3164 location of interest is the original symbol. On the
3165 other hand, an access to "sym+addend" where "sym" is not
3166 a section symbol should not include the addend; Such an
3167 access is presumed to be an offset from "sym"; The
3168 location of interest is just "sym". */
3169 if (symtype
== STT_SECTION
)
3172 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3173 elf_section_data (tsec
)->sec_info
,
3176 if (symtype
!= STT_SECTION
)
3182 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3183 if (tsec
->output_section
== sec
->output_section
)
3185 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3193 /* At this point, we don't know the load addresses of TSEC
3194 section nor SEC section. We estimate the distrance between
3197 for (asect
= sec
->output_section
;
3198 asect
!= NULL
&& asect
!= tsec
->output_section
;
3199 asect
= asect
->next
)
3202 for (i
= asect
->output_section
->map_head
.s
;
3206 size
= align_power (size
, i
->alignment_power
);
3211 /* Don't convert GOTPCREL relocations if TSEC isn't placed
3216 /* Take PT_GNU_RELRO segment into account by adding
3218 if ((toff
+ size
+ maxpagesize
- roff
+ 0x80000000)
3226 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
3231 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
3233 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3236 /* Convert to "jmp foo nop". */
3239 nop_offset
= irel
->r_offset
+ 3;
3240 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3241 irel
->r_offset
-= 1;
3242 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3246 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3249 nop
= link_info
->call_nop_byte
;
3250 if (link_info
->call_nop_as_suffix
)
3252 nop_offset
= irel
->r_offset
+ 3;
3253 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3254 irel
->r_offset
-= 1;
3255 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3258 nop_offset
= irel
->r_offset
- 2;
3260 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
3261 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
3262 r_type
= R_X86_64_PC32
;
3268 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
3269 "lea foo(%rip), %reg". */
3271 r_type
= R_X86_64_PC32
;
3275 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3278 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
3279 "test $foo, %reg". */
3280 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
3285 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
3286 "binop $foo, %reg". */
3287 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
3290 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
3292 if (r_type
== R_X86_64_REX_GOTPCRELX
)
3294 /* Move the R bit to the B bit in REX byte. */
3295 unsigned int rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
3296 rex
= (rex
& ~REX_R
) | (rex
& REX_R
) >> 2;
3297 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
3299 /* No addend for R_X86_64_32S relocation. */
3301 r_type
= R_X86_64_32S
;
3304 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
3307 irel
->r_info
= htab
->r_info (r_symndx
, r_type
);
3308 changed_contents
= TRUE
;
3309 changed_relocs
= TRUE
;
3313 if (h
->got
.refcount
> 0)
3314 h
->got
.refcount
-= 1;
3318 if (local_got_refcounts
!= NULL
3319 && local_got_refcounts
[r_symndx
] > 0)
3320 local_got_refcounts
[r_symndx
] -= 1;
3324 if (contents
!= NULL
3325 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3327 if (!changed_contents
&& !link_info
->keep_memory
)
3331 /* Cache the section contents for elf_link_input_bfd. */
3332 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3336 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3338 if (!changed_relocs
)
3339 free (internal_relocs
);
3341 elf_section_data (sec
)->relocs
= internal_relocs
;
3347 if (contents
!= NULL
3348 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3350 if (internal_relocs
!= NULL
3351 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3352 free (internal_relocs
);
3356 /* Set the sizes of the dynamic sections. */
3359 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3360 struct bfd_link_info
*info
)
3362 struct elf_x86_64_link_hash_table
*htab
;
3367 const struct elf_backend_data
*bed
;
3369 htab
= elf_x86_64_hash_table (info
);
3372 bed
= get_elf_backend_data (output_bfd
);
3374 dynobj
= htab
->elf
.dynobj
;
3378 if (htab
->elf
.dynamic_sections_created
)
3380 /* Set the contents of the .interp section to the interpreter. */
3381 if (bfd_link_executable (info
) && !info
->nointerp
)
3383 s
= bfd_get_linker_section (dynobj
, ".interp");
3386 s
->size
= htab
->dynamic_interpreter_size
;
3387 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3391 /* Set up .got offsets for local syms, and space for local dynamic
3393 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3395 bfd_signed_vma
*local_got
;
3396 bfd_signed_vma
*end_local_got
;
3397 char *local_tls_type
;
3398 bfd_vma
*local_tlsdesc_gotent
;
3399 bfd_size_type locsymcount
;
3400 Elf_Internal_Shdr
*symtab_hdr
;
3403 if (! is_x86_64_elf (ibfd
))
3406 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3408 struct elf_dyn_relocs
*p
;
3410 if (!elf_x86_64_convert_load (ibfd
, s
, info
))
3413 for (p
= (struct elf_dyn_relocs
*)
3414 (elf_section_data (s
)->local_dynrel
);
3418 if (!bfd_is_abs_section (p
->sec
)
3419 && bfd_is_abs_section (p
->sec
->output_section
))
3421 /* Input section has been discarded, either because
3422 it is a copy of a linkonce section or due to
3423 linker script /DISCARD/, so we'll be discarding
3426 else if (p
->count
!= 0)
3428 srel
= elf_section_data (p
->sec
)->sreloc
;
3429 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3430 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3431 && (info
->flags
& DF_TEXTREL
) == 0)
3433 info
->flags
|= DF_TEXTREL
;
3434 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3435 || info
->error_textrel
)
3436 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3437 p
->sec
->owner
, p
->sec
);
3443 local_got
= elf_local_got_refcounts (ibfd
);
3447 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3448 locsymcount
= symtab_hdr
->sh_info
;
3449 end_local_got
= local_got
+ locsymcount
;
3450 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3451 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3453 srel
= htab
->elf
.srelgot
;
3454 for (; local_got
< end_local_got
;
3455 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3457 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3460 if (GOT_TLS_GDESC_P (*local_tls_type
))
3462 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3463 - elf_x86_64_compute_jump_table_size (htab
);
3464 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3465 *local_got
= (bfd_vma
) -2;
3467 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3468 || GOT_TLS_GD_P (*local_tls_type
))
3470 *local_got
= s
->size
;
3471 s
->size
+= GOT_ENTRY_SIZE
;
3472 if (GOT_TLS_GD_P (*local_tls_type
))
3473 s
->size
+= GOT_ENTRY_SIZE
;
3475 if (bfd_link_pic (info
)
3476 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3477 || *local_tls_type
== GOT_TLS_IE
)
3479 if (GOT_TLS_GDESC_P (*local_tls_type
))
3481 htab
->elf
.srelplt
->size
3482 += bed
->s
->sizeof_rela
;
3483 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3485 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3486 || GOT_TLS_GD_P (*local_tls_type
))
3487 srel
->size
+= bed
->s
->sizeof_rela
;
3491 *local_got
= (bfd_vma
) -1;
3495 if (htab
->tls_ld_got
.refcount
> 0)
3497 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3499 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3500 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3501 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3504 htab
->tls_ld_got
.offset
= -1;
3506 /* Allocate global sym .plt and .got entries, and space for global
3507 sym dynamic relocs. */
3508 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3511 /* Allocate .plt and .got entries, and space for local symbols. */
3512 htab_traverse (htab
->loc_hash_table
,
3513 elf_x86_64_allocate_local_dynrelocs
,
3516 /* For every jump slot reserved in the sgotplt, reloc_count is
3517 incremented. However, when we reserve space for TLS descriptors,
3518 it's not incremented, so in order to compute the space reserved
3519 for them, it suffices to multiply the reloc count by the jump
3522 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3523 so that R_X86_64_IRELATIVE entries come last. */
3524 if (htab
->elf
.srelplt
)
3526 htab
->sgotplt_jump_table_size
3527 = elf_x86_64_compute_jump_table_size (htab
);
3528 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3530 else if (htab
->elf
.irelplt
)
3531 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3533 if (htab
->tlsdesc_plt
)
3535 /* If we're not using lazy TLS relocations, don't generate the
3536 PLT and GOT entries they require. */
3537 if ((info
->flags
& DF_BIND_NOW
))
3538 htab
->tlsdesc_plt
= 0;
3541 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3542 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3543 /* Reserve room for the initial entry.
3544 FIXME: we could probably do away with it in this case. */
3545 if (htab
->elf
.splt
->size
== 0)
3546 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3547 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3548 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3552 if (htab
->elf
.sgotplt
)
3554 /* Don't allocate .got.plt section if there are no GOT nor PLT
3555 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3556 if ((htab
->elf
.hgot
== NULL
3557 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3558 && (htab
->elf
.sgotplt
->size
3559 == get_elf_backend_data (output_bfd
)->got_header_size
)
3560 && (htab
->elf
.splt
== NULL
3561 || htab
->elf
.splt
->size
== 0)
3562 && (htab
->elf
.sgot
== NULL
3563 || htab
->elf
.sgot
->size
== 0)
3564 && (htab
->elf
.iplt
== NULL
3565 || htab
->elf
.iplt
->size
== 0)
3566 && (htab
->elf
.igotplt
== NULL
3567 || htab
->elf
.igotplt
->size
== 0))
3568 htab
->elf
.sgotplt
->size
= 0;
3571 if (htab
->plt_eh_frame
!= NULL
3572 && htab
->elf
.splt
!= NULL
3573 && htab
->elf
.splt
->size
!= 0
3574 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3575 && _bfd_elf_eh_frame_present (info
))
3577 const struct elf_x86_64_backend_data
*arch_data
3578 = get_elf_x86_64_arch_data (bed
);
3579 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3582 /* We now have determined the sizes of the various dynamic sections.
3583 Allocate memory for them. */
3585 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3587 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3590 if (s
== htab
->elf
.splt
3591 || s
== htab
->elf
.sgot
3592 || s
== htab
->elf
.sgotplt
3593 || s
== htab
->elf
.iplt
3594 || s
== htab
->elf
.igotplt
3595 || s
== htab
->plt_bnd
3596 || s
== htab
->plt_got
3597 || s
== htab
->plt_eh_frame
3598 || s
== htab
->sdynbss
)
3600 /* Strip this section if we don't need it; see the
3603 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3605 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3608 /* We use the reloc_count field as a counter if we need
3609 to copy relocs into the output file. */
3610 if (s
!= htab
->elf
.srelplt
)
3615 /* It's not one of our sections, so don't allocate space. */
3621 /* If we don't need this section, strip it from the
3622 output file. This is mostly to handle .rela.bss and
3623 .rela.plt. We must create both sections in
3624 create_dynamic_sections, because they must be created
3625 before the linker maps input sections to output
3626 sections. The linker does that before
3627 adjust_dynamic_symbol is called, and it is that
3628 function which decides whether anything needs to go
3629 into these sections. */
3631 s
->flags
|= SEC_EXCLUDE
;
3635 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3638 /* Allocate memory for the section contents. We use bfd_zalloc
3639 here in case unused entries are not reclaimed before the
3640 section's contents are written out. This should not happen,
3641 but this way if it does, we get a R_X86_64_NONE reloc instead
3643 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3644 if (s
->contents
== NULL
)
3648 if (htab
->plt_eh_frame
!= NULL
3649 && htab
->plt_eh_frame
->contents
!= NULL
)
3651 const struct elf_x86_64_backend_data
*arch_data
3652 = get_elf_x86_64_arch_data (bed
);
3654 memcpy (htab
->plt_eh_frame
->contents
,
3655 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3656 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3657 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3660 if (htab
->elf
.dynamic_sections_created
)
3662 /* Add some entries to the .dynamic section. We fill in the
3663 values later, in elf_x86_64_finish_dynamic_sections, but we
3664 must add the entries now so that we get the correct size for
3665 the .dynamic section. The DT_DEBUG entry is filled in by the
3666 dynamic linker and used by the debugger. */
3667 #define add_dynamic_entry(TAG, VAL) \
3668 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3670 if (bfd_link_executable (info
))
3672 if (!add_dynamic_entry (DT_DEBUG
, 0))
3676 if (htab
->elf
.splt
->size
!= 0)
3678 /* DT_PLTGOT is used by prelink even if there is no PLT
3680 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3683 if (htab
->elf
.srelplt
->size
!= 0)
3685 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3686 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3687 || !add_dynamic_entry (DT_JMPREL
, 0))
3691 if (htab
->tlsdesc_plt
3692 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3693 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3699 if (!add_dynamic_entry (DT_RELA
, 0)
3700 || !add_dynamic_entry (DT_RELASZ
, 0)
3701 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3704 /* If any dynamic relocs apply to a read-only section,
3705 then we need a DT_TEXTREL entry. */
3706 if ((info
->flags
& DF_TEXTREL
) == 0)
3707 elf_link_hash_traverse (&htab
->elf
,
3708 elf_x86_64_readonly_dynrelocs
,
3711 if ((info
->flags
& DF_TEXTREL
) != 0)
3713 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3714 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3716 info
->callbacks
->einfo
3717 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3718 bfd_set_error (bfd_error_bad_value
);
3722 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3727 #undef add_dynamic_entry
3733 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3734 struct bfd_link_info
*info
)
3736 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3740 struct elf_link_hash_entry
*tlsbase
;
3742 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3743 "_TLS_MODULE_BASE_",
3744 FALSE
, FALSE
, FALSE
);
3746 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3748 struct elf_x86_64_link_hash_table
*htab
;
3749 struct bfd_link_hash_entry
*bh
= NULL
;
3750 const struct elf_backend_data
*bed
3751 = get_elf_backend_data (output_bfd
);
3753 htab
= elf_x86_64_hash_table (info
);
3757 if (!(_bfd_generic_link_add_one_symbol
3758 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3759 tls_sec
, 0, NULL
, FALSE
,
3760 bed
->collect
, &bh
)))
3763 htab
->tls_module_base
= bh
;
3765 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3766 tlsbase
->def_regular
= 1;
3767 tlsbase
->other
= STV_HIDDEN
;
3768 tlsbase
->root
.linker_def
= 1;
3769 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3776 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3777 executables. Rather than setting it to the beginning of the TLS
3778 section, we have to set it to the end. This function may be called
3779 multiple times, it is idempotent. */
3782 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3784 struct elf_x86_64_link_hash_table
*htab
;
3785 struct bfd_link_hash_entry
*base
;
3787 if (!bfd_link_executable (info
))
3790 htab
= elf_x86_64_hash_table (info
);
3794 base
= htab
->tls_module_base
;
3798 base
->u
.def
.value
= htab
->elf
.tls_size
;
3801 /* Return the base VMA address which should be subtracted from real addresses
3802 when resolving @dtpoff relocation.
3803 This is PT_TLS segment p_vaddr. */
3806 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3808 /* If tls_sec is NULL, we should have signalled an error already. */
3809 if (elf_hash_table (info
)->tls_sec
== NULL
)
3811 return elf_hash_table (info
)->tls_sec
->vma
;
3814 /* Return the relocation value for @tpoff relocation
3815 if STT_TLS virtual address is ADDRESS. */
3818 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3820 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3821 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3822 bfd_vma static_tls_size
;
3824 /* If tls_segment is NULL, we should have signalled an error already. */
3825 if (htab
->tls_sec
== NULL
)
3828 /* Consider special static TLS alignment requirements. */
3829 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3830 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3833 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3837 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3839 /* Opcode Instruction
3842 0x0f 0x8x conditional jump */
3844 && (contents
[offset
- 1] == 0xe8
3845 || contents
[offset
- 1] == 0xe9))
3847 && contents
[offset
- 2] == 0x0f
3848 && (contents
[offset
- 1] & 0xf0) == 0x80));
3851 /* Relocate an x86_64 ELF section. */
3854 elf_x86_64_relocate_section (bfd
*output_bfd
,
3855 struct bfd_link_info
*info
,
3857 asection
*input_section
,
3859 Elf_Internal_Rela
*relocs
,
3860 Elf_Internal_Sym
*local_syms
,
3861 asection
**local_sections
)
3863 struct elf_x86_64_link_hash_table
*htab
;
3864 Elf_Internal_Shdr
*symtab_hdr
;
3865 struct elf_link_hash_entry
**sym_hashes
;
3866 bfd_vma
*local_got_offsets
;
3867 bfd_vma
*local_tlsdesc_gotents
;
3868 Elf_Internal_Rela
*rel
;
3869 Elf_Internal_Rela
*wrel
;
3870 Elf_Internal_Rela
*relend
;
3871 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3873 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3875 htab
= elf_x86_64_hash_table (info
);
3878 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3879 sym_hashes
= elf_sym_hashes (input_bfd
);
3880 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3881 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3883 elf_x86_64_set_tls_module_base (info
);
3885 rel
= wrel
= relocs
;
3886 relend
= relocs
+ input_section
->reloc_count
;
3887 for (; rel
< relend
; wrel
++, rel
++)
3889 unsigned int r_type
;
3890 reloc_howto_type
*howto
;
3891 unsigned long r_symndx
;
3892 struct elf_link_hash_entry
*h
;
3893 struct elf_x86_64_link_hash_entry
*eh
;
3894 Elf_Internal_Sym
*sym
;
3896 bfd_vma off
, offplt
, plt_offset
;
3898 bfd_boolean unresolved_reloc
;
3899 bfd_reloc_status_type r
;
3901 asection
*base_got
, *resolved_plt
;
3904 r_type
= ELF32_R_TYPE (rel
->r_info
);
3905 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3906 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3909 if (r_type
>= (int) R_X86_64_standard
)
3911 (*_bfd_error_handler
)
3912 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3913 input_bfd
, input_section
, r_type
);
3914 bfd_set_error (bfd_error_bad_value
);
3918 if (r_type
!= (int) R_X86_64_32
3919 || ABI_64_P (output_bfd
))
3920 howto
= x86_64_elf_howto_table
+ r_type
;
3922 howto
= (x86_64_elf_howto_table
3923 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3924 r_symndx
= htab
->r_sym (rel
->r_info
);
3928 unresolved_reloc
= FALSE
;
3929 if (r_symndx
< symtab_hdr
->sh_info
)
3931 sym
= local_syms
+ r_symndx
;
3932 sec
= local_sections
[r_symndx
];
3934 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3936 st_size
= sym
->st_size
;
3938 /* Relocate against local STT_GNU_IFUNC symbol. */
3939 if (!bfd_link_relocatable (info
)
3940 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3942 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3947 /* Set STT_GNU_IFUNC symbol value. */
3948 h
->root
.u
.def
.value
= sym
->st_value
;
3949 h
->root
.u
.def
.section
= sec
;
3954 bfd_boolean warned ATTRIBUTE_UNUSED
;
3955 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3957 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3958 r_symndx
, symtab_hdr
, sym_hashes
,
3960 unresolved_reloc
, warned
, ignored
);
3964 if (sec
!= NULL
&& discarded_section (sec
))
3966 _bfd_clear_contents (howto
, input_bfd
, input_section
,
3967 contents
+ rel
->r_offset
);
3968 wrel
->r_offset
= rel
->r_offset
;
3972 /* For ld -r, remove relocations in debug sections against
3973 sections defined in discarded sections. Not done for
3974 eh_frame editing code expects to be present. */
3975 if (bfd_link_relocatable (info
)
3976 && (input_section
->flags
& SEC_DEBUGGING
))
3982 if (bfd_link_relocatable (info
))
3989 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
3991 if (r_type
== R_X86_64_64
)
3993 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3994 zero-extend it to 64bit if addend is zero. */
3995 r_type
= R_X86_64_32
;
3996 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3998 else if (r_type
== R_X86_64_SIZE64
)
4000 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4001 zero-extend it to 64bit if addend is zero. */
4002 r_type
= R_X86_64_SIZE32
;
4003 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4007 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
4009 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4010 it here if it is defined in a non-shared object. */
4012 && h
->type
== STT_GNU_IFUNC
4018 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4020 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4021 sections because such sections are not SEC_ALLOC and
4022 thus ld.so will not process them. */
4023 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
4027 else if (h
->plt
.offset
== (bfd_vma
) -1)
4030 /* STT_GNU_IFUNC symbol must go through PLT. */
4031 if (htab
->elf
.splt
!= NULL
)
4033 if (htab
->plt_bnd
!= NULL
)
4035 resolved_plt
= htab
->plt_bnd
;
4036 plt_offset
= eh
->plt_bnd
.offset
;
4040 resolved_plt
= htab
->elf
.splt
;
4041 plt_offset
= h
->plt
.offset
;
4046 resolved_plt
= htab
->elf
.iplt
;
4047 plt_offset
= h
->plt
.offset
;
4050 relocation
= (resolved_plt
->output_section
->vma
4051 + resolved_plt
->output_offset
+ plt_offset
);
4056 if (h
->root
.root
.string
)
4057 name
= h
->root
.root
.string
;
4059 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4061 (*_bfd_error_handler
)
4062 (_("%B: relocation %s against STT_GNU_IFUNC "
4063 "symbol `%s' isn't handled by %s"), input_bfd
,
4064 x86_64_elf_howto_table
[r_type
].name
,
4065 name
, __FUNCTION__
);
4066 bfd_set_error (bfd_error_bad_value
);
4070 if (bfd_link_pic (info
))
4075 if (ABI_64_P (output_bfd
))
4079 if (rel
->r_addend
!= 0)
4081 if (h
->root
.root
.string
)
4082 name
= h
->root
.root
.string
;
4084 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4086 (*_bfd_error_handler
)
4087 (_("%B: relocation %s against STT_GNU_IFUNC "
4088 "symbol `%s' has non-zero addend: %d"),
4089 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
4090 name
, rel
->r_addend
);
4091 bfd_set_error (bfd_error_bad_value
);
4095 /* Generate dynamic relcoation only when there is a
4096 non-GOT reference in a shared object. */
4097 if (bfd_link_pic (info
) && h
->non_got_ref
)
4099 Elf_Internal_Rela outrel
;
4102 /* Need a dynamic relocation to get the real function
4104 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
4108 if (outrel
.r_offset
== (bfd_vma
) -1
4109 || outrel
.r_offset
== (bfd_vma
) -2)
4112 outrel
.r_offset
+= (input_section
->output_section
->vma
4113 + input_section
->output_offset
);
4115 if (h
->dynindx
== -1
4117 || bfd_link_executable (info
))
4119 /* This symbol is resolved locally. */
4120 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4121 outrel
.r_addend
= (h
->root
.u
.def
.value
4122 + h
->root
.u
.def
.section
->output_section
->vma
4123 + h
->root
.u
.def
.section
->output_offset
);
4127 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4128 outrel
.r_addend
= 0;
4131 sreloc
= htab
->elf
.irelifunc
;
4132 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4134 /* If this reloc is against an external symbol, we
4135 do not want to fiddle with the addend. Otherwise,
4136 we need to include the symbol value so that it
4137 becomes an addend for the dynamic reloc. For an
4138 internal symbol, we have updated addend. */
4143 case R_X86_64_PC32_BND
:
4145 case R_X86_64_PLT32
:
4146 case R_X86_64_PLT32_BND
:
4149 case R_X86_64_GOTPCREL
:
4150 case R_X86_64_GOTPCRELX
:
4151 case R_X86_64_REX_GOTPCRELX
:
4152 case R_X86_64_GOTPCREL64
:
4153 base_got
= htab
->elf
.sgot
;
4154 off
= h
->got
.offset
;
4156 if (base_got
== NULL
)
4159 if (off
== (bfd_vma
) -1)
4161 /* We can't use h->got.offset here to save state, or
4162 even just remember the offset, as finish_dynamic_symbol
4163 would use that as offset into .got. */
4165 if (htab
->elf
.splt
!= NULL
)
4167 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4168 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4169 base_got
= htab
->elf
.sgotplt
;
4173 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4174 off
= plt_index
* GOT_ENTRY_SIZE
;
4175 base_got
= htab
->elf
.igotplt
;
4178 if (h
->dynindx
== -1
4182 /* This references the local defitionion. We must
4183 initialize this entry in the global offset table.
4184 Since the offset must always be a multiple of 8,
4185 we use the least significant bit to record
4186 whether we have initialized it already.
4188 When doing a dynamic link, we create a .rela.got
4189 relocation entry to initialize the value. This
4190 is done in the finish_dynamic_symbol routine. */
4195 bfd_put_64 (output_bfd
, relocation
,
4196 base_got
->contents
+ off
);
4197 /* Note that this is harmless for the GOTPLT64
4198 case, as -1 | 1 still is -1. */
4204 relocation
= (base_got
->output_section
->vma
4205 + base_got
->output_offset
+ off
);
4211 /* When generating a shared object, the relocations handled here are
4212 copied into the output file to be resolved at run time. */
4215 case R_X86_64_GOT32
:
4216 case R_X86_64_GOT64
:
4217 /* Relocation is to the entry for this symbol in the global
4219 case R_X86_64_GOTPCREL
:
4220 case R_X86_64_GOTPCRELX
:
4221 case R_X86_64_REX_GOTPCRELX
:
4222 case R_X86_64_GOTPCREL64
:
4223 /* Use global offset table entry as symbol value. */
4224 case R_X86_64_GOTPLT64
:
4225 /* This is obsolete and treated the the same as GOT64. */
4226 base_got
= htab
->elf
.sgot
;
4228 if (htab
->elf
.sgot
== NULL
)
4235 off
= h
->got
.offset
;
4237 && h
->plt
.offset
!= (bfd_vma
)-1
4238 && off
== (bfd_vma
)-1)
4240 /* We can't use h->got.offset here to save
4241 state, or even just remember the offset, as
4242 finish_dynamic_symbol would use that as offset into
4244 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4245 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4246 base_got
= htab
->elf
.sgotplt
;
4249 dyn
= htab
->elf
.dynamic_sections_created
;
4251 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4252 || (bfd_link_pic (info
)
4253 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4254 || (ELF_ST_VISIBILITY (h
->other
)
4255 && h
->root
.type
== bfd_link_hash_undefweak
))
4257 /* This is actually a static link, or it is a -Bsymbolic
4258 link and the symbol is defined locally, or the symbol
4259 was forced to be local because of a version file. We
4260 must initialize this entry in the global offset table.
4261 Since the offset must always be a multiple of 8, we
4262 use the least significant bit to record whether we
4263 have initialized it already.
4265 When doing a dynamic link, we create a .rela.got
4266 relocation entry to initialize the value. This is
4267 done in the finish_dynamic_symbol routine. */
4272 bfd_put_64 (output_bfd
, relocation
,
4273 base_got
->contents
+ off
);
4274 /* Note that this is harmless for the GOTPLT64 case,
4275 as -1 | 1 still is -1. */
4280 unresolved_reloc
= FALSE
;
4284 if (local_got_offsets
== NULL
)
4287 off
= local_got_offsets
[r_symndx
];
4289 /* The offset must always be a multiple of 8. We use
4290 the least significant bit to record whether we have
4291 already generated the necessary reloc. */
4296 bfd_put_64 (output_bfd
, relocation
,
4297 base_got
->contents
+ off
);
4299 if (bfd_link_pic (info
))
4302 Elf_Internal_Rela outrel
;
4304 /* We need to generate a R_X86_64_RELATIVE reloc
4305 for the dynamic linker. */
4306 s
= htab
->elf
.srelgot
;
4310 outrel
.r_offset
= (base_got
->output_section
->vma
4311 + base_got
->output_offset
4313 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4314 outrel
.r_addend
= relocation
;
4315 elf_append_rela (output_bfd
, s
, &outrel
);
4318 local_got_offsets
[r_symndx
] |= 1;
4322 if (off
>= (bfd_vma
) -2)
4325 relocation
= base_got
->output_section
->vma
4326 + base_got
->output_offset
+ off
;
4327 if (r_type
!= R_X86_64_GOTPCREL
4328 && r_type
!= R_X86_64_GOTPCRELX
4329 && r_type
!= R_X86_64_REX_GOTPCRELX
4330 && r_type
!= R_X86_64_GOTPCREL64
)
4331 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4332 - htab
->elf
.sgotplt
->output_offset
;
4336 case R_X86_64_GOTOFF64
:
4337 /* Relocation is relative to the start of the global offset
4340 /* Check to make sure it isn't a protected function or data
4341 symbol for shared library since it may not be local when
4342 used as function address or with copy relocation. We also
4343 need to make sure that a symbol is referenced locally. */
4344 if (bfd_link_pic (info
) && h
)
4346 if (!h
->def_regular
)
4350 switch (ELF_ST_VISIBILITY (h
->other
))
4353 v
= _("hidden symbol");
4356 v
= _("internal symbol");
4359 v
= _("protected symbol");
4366 (*_bfd_error_handler
)
4367 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4368 input_bfd
, v
, h
->root
.root
.string
);
4369 bfd_set_error (bfd_error_bad_value
);
4372 else if (!bfd_link_executable (info
)
4373 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4374 && (h
->type
== STT_FUNC
4375 || h
->type
== STT_OBJECT
)
4376 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4378 (*_bfd_error_handler
)
4379 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4381 h
->type
== STT_FUNC
? "function" : "data",
4382 h
->root
.root
.string
);
4383 bfd_set_error (bfd_error_bad_value
);
4388 /* Note that sgot is not involved in this
4389 calculation. We always want the start of .got.plt. If we
4390 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4391 permitted by the ABI, we might have to change this
4393 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4394 + htab
->elf
.sgotplt
->output_offset
;
4397 case R_X86_64_GOTPC32
:
4398 case R_X86_64_GOTPC64
:
4399 /* Use global offset table as symbol value. */
4400 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4401 + htab
->elf
.sgotplt
->output_offset
;
4402 unresolved_reloc
= FALSE
;
4405 case R_X86_64_PLTOFF64
:
4406 /* Relocation is PLT entry relative to GOT. For local
4407 symbols it's the symbol itself relative to GOT. */
4409 /* See PLT32 handling. */
4410 && h
->plt
.offset
!= (bfd_vma
) -1
4411 && htab
->elf
.splt
!= NULL
)
4413 if (htab
->plt_bnd
!= NULL
)
4415 resolved_plt
= htab
->plt_bnd
;
4416 plt_offset
= eh
->plt_bnd
.offset
;
4420 resolved_plt
= htab
->elf
.splt
;
4421 plt_offset
= h
->plt
.offset
;
4424 relocation
= (resolved_plt
->output_section
->vma
4425 + resolved_plt
->output_offset
4427 unresolved_reloc
= FALSE
;
4430 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4431 + htab
->elf
.sgotplt
->output_offset
;
4434 case R_X86_64_PLT32
:
4435 case R_X86_64_PLT32_BND
:
4436 /* Relocation is to the entry for this symbol in the
4437 procedure linkage table. */
4439 /* Resolve a PLT32 reloc against a local symbol directly,
4440 without using the procedure linkage table. */
4444 if ((h
->plt
.offset
== (bfd_vma
) -1
4445 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4446 || htab
->elf
.splt
== NULL
)
4448 /* We didn't make a PLT entry for this symbol. This
4449 happens when statically linking PIC code, or when
4450 using -Bsymbolic. */
4454 if (h
->plt
.offset
!= (bfd_vma
) -1)
4456 if (htab
->plt_bnd
!= NULL
)
4458 resolved_plt
= htab
->plt_bnd
;
4459 plt_offset
= eh
->plt_bnd
.offset
;
4463 resolved_plt
= htab
->elf
.splt
;
4464 plt_offset
= h
->plt
.offset
;
4469 /* Use the GOT PLT. */
4470 resolved_plt
= htab
->plt_got
;
4471 plt_offset
= eh
->plt_got
.offset
;
4474 relocation
= (resolved_plt
->output_section
->vma
4475 + resolved_plt
->output_offset
4477 unresolved_reloc
= FALSE
;
4480 case R_X86_64_SIZE32
:
4481 case R_X86_64_SIZE64
:
4482 /* Set to symbol size. */
4483 relocation
= st_size
;
4489 case R_X86_64_PC32_BND
:
4490 /* Don't complain about -fPIC if the symbol is undefined when
4491 building executable. */
4492 if (bfd_link_pic (info
)
4493 && (input_section
->flags
& SEC_ALLOC
) != 0
4494 && (input_section
->flags
& SEC_READONLY
) != 0
4496 && !(bfd_link_executable (info
)
4497 && h
->root
.type
== bfd_link_hash_undefined
))
4499 bfd_boolean fail
= FALSE
;
4501 = ((r_type
== R_X86_64_PC32
4502 || r_type
== R_X86_64_PC32_BND
)
4503 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4505 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4507 /* Symbol is referenced locally. Make sure it is
4508 defined locally or for a branch. */
4509 fail
= !h
->def_regular
&& !branch
;
4511 else if (!(bfd_link_executable (info
)
4512 && (h
->needs_copy
|| eh
->needs_copy
)))
4514 /* Symbol doesn't need copy reloc and isn't referenced
4515 locally. We only allow branch to symbol with
4516 non-default visibility. */
4518 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4525 const char *pic
= "";
4527 switch (ELF_ST_VISIBILITY (h
->other
))
4530 v
= _("hidden symbol");
4533 v
= _("internal symbol");
4536 v
= _("protected symbol");
4540 pic
= _("; recompile with -fPIC");
4545 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4547 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4549 (*_bfd_error_handler
) (fmt
, input_bfd
,
4550 x86_64_elf_howto_table
[r_type
].name
,
4551 v
, h
->root
.root
.string
, pic
);
4552 bfd_set_error (bfd_error_bad_value
);
4563 /* FIXME: The ABI says the linker should make sure the value is
4564 the same when it's zeroextended to 64 bit. */
4567 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4570 /* Don't copy a pc-relative relocation into the output file
4571 if the symbol needs copy reloc or the symbol is undefined
4572 when building executable. Copy dynamic function pointer
4574 if ((bfd_link_pic (info
)
4575 && !(bfd_link_executable (info
)
4579 || h
->root
.type
== bfd_link_hash_undefined
)
4580 && IS_X86_64_PCREL_TYPE (r_type
))
4582 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4583 || h
->root
.type
!= bfd_link_hash_undefweak
)
4584 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4585 && r_type
!= R_X86_64_SIZE32
4586 && r_type
!= R_X86_64_SIZE64
)
4587 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4588 || (ELIMINATE_COPY_RELOCS
4589 && !bfd_link_pic (info
)
4592 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4595 || h
->root
.type
== bfd_link_hash_undefweak
4596 || h
->root
.type
== bfd_link_hash_undefined
)))
4598 Elf_Internal_Rela outrel
;
4599 bfd_boolean skip
, relocate
;
4602 /* When generating a shared object, these relocations
4603 are copied into the output file to be resolved at run
4609 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4611 if (outrel
.r_offset
== (bfd_vma
) -1)
4613 else if (outrel
.r_offset
== (bfd_vma
) -2)
4614 skip
= TRUE
, relocate
= TRUE
;
4616 outrel
.r_offset
+= (input_section
->output_section
->vma
4617 + input_section
->output_offset
);
4620 memset (&outrel
, 0, sizeof outrel
);
4622 /* h->dynindx may be -1 if this symbol was marked to
4626 && (IS_X86_64_PCREL_TYPE (r_type
)
4627 || ! bfd_link_pic (info
)
4628 || ! SYMBOLIC_BIND (info
, h
)
4629 || ! h
->def_regular
))
4631 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4632 outrel
.r_addend
= rel
->r_addend
;
4636 /* This symbol is local, or marked to become local. */
4637 if (r_type
== htab
->pointer_r_type
)
4640 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4641 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4643 else if (r_type
== R_X86_64_64
4644 && !ABI_64_P (output_bfd
))
4647 outrel
.r_info
= htab
->r_info (0,
4648 R_X86_64_RELATIVE64
);
4649 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4650 /* Check addend overflow. */
4651 if ((outrel
.r_addend
& 0x80000000)
4652 != (rel
->r_addend
& 0x80000000))
4655 int addend
= rel
->r_addend
;
4656 if (h
&& h
->root
.root
.string
)
4657 name
= h
->root
.root
.string
;
4659 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4662 (*_bfd_error_handler
)
4663 (_("%B: addend -0x%x in relocation %s against "
4664 "symbol `%s' at 0x%lx in section `%A' is "
4666 input_bfd
, input_section
, addend
,
4667 x86_64_elf_howto_table
[r_type
].name
,
4668 name
, (unsigned long) rel
->r_offset
);
4670 (*_bfd_error_handler
)
4671 (_("%B: addend 0x%x in relocation %s against "
4672 "symbol `%s' at 0x%lx in section `%A' is "
4674 input_bfd
, input_section
, addend
,
4675 x86_64_elf_howto_table
[r_type
].name
,
4676 name
, (unsigned long) rel
->r_offset
);
4677 bfd_set_error (bfd_error_bad_value
);
4685 if (bfd_is_abs_section (sec
))
4687 else if (sec
== NULL
|| sec
->owner
== NULL
)
4689 bfd_set_error (bfd_error_bad_value
);
4696 /* We are turning this relocation into one
4697 against a section symbol. It would be
4698 proper to subtract the symbol's value,
4699 osec->vma, from the emitted reloc addend,
4700 but ld.so expects buggy relocs. */
4701 osec
= sec
->output_section
;
4702 sindx
= elf_section_data (osec
)->dynindx
;
4705 asection
*oi
= htab
->elf
.text_index_section
;
4706 sindx
= elf_section_data (oi
)->dynindx
;
4708 BFD_ASSERT (sindx
!= 0);
4711 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4712 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4716 sreloc
= elf_section_data (input_section
)->sreloc
;
4718 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4720 r
= bfd_reloc_notsupported
;
4721 goto check_relocation_error
;
4724 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4726 /* If this reloc is against an external symbol, we do
4727 not want to fiddle with the addend. Otherwise, we
4728 need to include the symbol value so that it becomes
4729 an addend for the dynamic reloc. */
4736 case R_X86_64_TLSGD
:
4737 case R_X86_64_GOTPC32_TLSDESC
:
4738 case R_X86_64_TLSDESC_CALL
:
4739 case R_X86_64_GOTTPOFF
:
4740 tls_type
= GOT_UNKNOWN
;
4741 if (h
== NULL
&& local_got_offsets
)
4742 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4744 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4746 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4747 input_section
, contents
,
4748 symtab_hdr
, sym_hashes
,
4749 &r_type
, tls_type
, rel
,
4750 relend
, h
, r_symndx
))
4753 if (r_type
== R_X86_64_TPOFF32
)
4755 bfd_vma roff
= rel
->r_offset
;
4757 BFD_ASSERT (! unresolved_reloc
);
4759 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4761 /* GD->LE transition. For 64bit, change
4762 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4763 .word 0x6666; rex64; call __tls_get_addr
4766 leaq foo@tpoff(%rax), %rax
4768 leaq foo@tlsgd(%rip), %rdi
4769 .word 0x6666; rex64; call __tls_get_addr
4772 leaq foo@tpoff(%rax), %rax
4773 For largepic, change:
4774 leaq foo@tlsgd(%rip), %rdi
4775 movabsq $__tls_get_addr@pltoff, %rax
4780 leaq foo@tpoff(%rax), %rax
4781 nopw 0x0(%rax,%rax,1) */
4783 if (ABI_64_P (output_bfd
)
4784 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4786 memcpy (contents
+ roff
- 3,
4787 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4788 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4791 else if (ABI_64_P (output_bfd
))
4792 memcpy (contents
+ roff
- 4,
4793 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4796 memcpy (contents
+ roff
- 3,
4797 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4799 bfd_put_32 (output_bfd
,
4800 elf_x86_64_tpoff (info
, relocation
),
4801 contents
+ roff
+ 8 + largepic
);
4802 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4807 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4809 /* GDesc -> LE transition.
4810 It's originally something like:
4811 leaq x@tlsdesc(%rip), %rax
4814 movl $x@tpoff, %rax. */
4816 unsigned int val
, type
;
4818 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4819 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4820 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4821 contents
+ roff
- 3);
4822 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4823 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4824 contents
+ roff
- 1);
4825 bfd_put_32 (output_bfd
,
4826 elf_x86_64_tpoff (info
, relocation
),
4830 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4832 /* GDesc -> LE transition.
4837 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4838 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4841 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4843 /* IE->LE transition:
4844 For 64bit, originally it can be one of:
4845 movq foo@gottpoff(%rip), %reg
4846 addq foo@gottpoff(%rip), %reg
4849 leaq foo(%reg), %reg
4851 For 32bit, originally it can be one of:
4852 movq foo@gottpoff(%rip), %reg
4853 addl foo@gottpoff(%rip), %reg
4856 leal foo(%reg), %reg
4859 unsigned int val
, type
, reg
;
4862 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4865 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4866 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4872 bfd_put_8 (output_bfd
, 0x49,
4873 contents
+ roff
- 3);
4874 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4875 bfd_put_8 (output_bfd
, 0x41,
4876 contents
+ roff
- 3);
4877 bfd_put_8 (output_bfd
, 0xc7,
4878 contents
+ roff
- 2);
4879 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4880 contents
+ roff
- 1);
4884 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4887 bfd_put_8 (output_bfd
, 0x49,
4888 contents
+ roff
- 3);
4889 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4890 bfd_put_8 (output_bfd
, 0x41,
4891 contents
+ roff
- 3);
4892 bfd_put_8 (output_bfd
, 0x81,
4893 contents
+ roff
- 2);
4894 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4895 contents
+ roff
- 1);
4899 /* addq/addl -> leaq/leal */
4901 bfd_put_8 (output_bfd
, 0x4d,
4902 contents
+ roff
- 3);
4903 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4904 bfd_put_8 (output_bfd
, 0x45,
4905 contents
+ roff
- 3);
4906 bfd_put_8 (output_bfd
, 0x8d,
4907 contents
+ roff
- 2);
4908 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4909 contents
+ roff
- 1);
4911 bfd_put_32 (output_bfd
,
4912 elf_x86_64_tpoff (info
, relocation
),
4920 if (htab
->elf
.sgot
== NULL
)
4925 off
= h
->got
.offset
;
4926 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4930 if (local_got_offsets
== NULL
)
4933 off
= local_got_offsets
[r_symndx
];
4934 offplt
= local_tlsdesc_gotents
[r_symndx
];
4941 Elf_Internal_Rela outrel
;
4945 if (htab
->elf
.srelgot
== NULL
)
4948 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4950 if (GOT_TLS_GDESC_P (tls_type
))
4952 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4953 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4954 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4955 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4956 + htab
->elf
.sgotplt
->output_offset
4958 + htab
->sgotplt_jump_table_size
);
4959 sreloc
= htab
->elf
.srelplt
;
4961 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4963 outrel
.r_addend
= 0;
4964 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4967 sreloc
= htab
->elf
.srelgot
;
4969 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4970 + htab
->elf
.sgot
->output_offset
+ off
);
4972 if (GOT_TLS_GD_P (tls_type
))
4973 dr_type
= R_X86_64_DTPMOD64
;
4974 else if (GOT_TLS_GDESC_P (tls_type
))
4977 dr_type
= R_X86_64_TPOFF64
;
4979 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4980 outrel
.r_addend
= 0;
4981 if ((dr_type
== R_X86_64_TPOFF64
4982 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4983 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4984 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4986 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4988 if (GOT_TLS_GD_P (tls_type
))
4992 BFD_ASSERT (! unresolved_reloc
);
4993 bfd_put_64 (output_bfd
,
4994 relocation
- elf_x86_64_dtpoff_base (info
),
4995 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4999 bfd_put_64 (output_bfd
, 0,
5000 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5001 outrel
.r_info
= htab
->r_info (indx
,
5003 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
5004 elf_append_rela (output_bfd
, sreloc
,
5013 local_got_offsets
[r_symndx
] |= 1;
5016 if (off
>= (bfd_vma
) -2
5017 && ! GOT_TLS_GDESC_P (tls_type
))
5019 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
5021 if (r_type
== R_X86_64_GOTPC32_TLSDESC
5022 || r_type
== R_X86_64_TLSDESC_CALL
)
5023 relocation
= htab
->elf
.sgotplt
->output_section
->vma
5024 + htab
->elf
.sgotplt
->output_offset
5025 + offplt
+ htab
->sgotplt_jump_table_size
;
5027 relocation
= htab
->elf
.sgot
->output_section
->vma
5028 + htab
->elf
.sgot
->output_offset
+ off
;
5029 unresolved_reloc
= FALSE
;
5033 bfd_vma roff
= rel
->r_offset
;
5035 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5037 /* GD->IE transition. For 64bit, change
5038 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5039 .word 0x6666; rex64; call __tls_get_addr@plt
5042 addq foo@gottpoff(%rip), %rax
5044 leaq foo@tlsgd(%rip), %rdi
5045 .word 0x6666; rex64; call __tls_get_addr@plt
5048 addq foo@gottpoff(%rip), %rax
5049 For largepic, change:
5050 leaq foo@tlsgd(%rip), %rdi
5051 movabsq $__tls_get_addr@pltoff, %rax
5056 addq foo@gottpoff(%rax), %rax
5057 nopw 0x0(%rax,%rax,1) */
5059 if (ABI_64_P (output_bfd
)
5060 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
5062 memcpy (contents
+ roff
- 3,
5063 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5064 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5067 else if (ABI_64_P (output_bfd
))
5068 memcpy (contents
+ roff
- 4,
5069 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5072 memcpy (contents
+ roff
- 3,
5073 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5076 relocation
= (htab
->elf
.sgot
->output_section
->vma
5077 + htab
->elf
.sgot
->output_offset
+ off
5080 - input_section
->output_section
->vma
5081 - input_section
->output_offset
5083 bfd_put_32 (output_bfd
, relocation
,
5084 contents
+ roff
+ 8 + largepic
);
5085 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5090 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5092 /* GDesc -> IE transition.
5093 It's originally something like:
5094 leaq x@tlsdesc(%rip), %rax
5097 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5099 /* Now modify the instruction as appropriate. To
5100 turn a leaq into a movq in the form we use it, it
5101 suffices to change the second byte from 0x8d to
5103 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
5105 bfd_put_32 (output_bfd
,
5106 htab
->elf
.sgot
->output_section
->vma
5107 + htab
->elf
.sgot
->output_offset
+ off
5109 - input_section
->output_section
->vma
5110 - input_section
->output_offset
5115 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5117 /* GDesc -> IE transition.
5124 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5125 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5133 case R_X86_64_TLSLD
:
5134 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5135 input_section
, contents
,
5136 symtab_hdr
, sym_hashes
,
5137 &r_type
, GOT_UNKNOWN
,
5138 rel
, relend
, h
, r_symndx
))
5141 if (r_type
!= R_X86_64_TLSLD
)
5143 /* LD->LE transition:
5144 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
5145 For 64bit, we change it into:
5146 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
5147 For 32bit, we change it into:
5148 nopl 0x0(%rax); movl %fs:0, %eax.
5149 For largepic, change:
5150 leaq foo@tlsgd(%rip), %rdi
5151 movabsq $__tls_get_addr@pltoff, %rax
5155 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
5158 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
5159 if (ABI_64_P (output_bfd
)
5160 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
5161 memcpy (contents
+ rel
->r_offset
- 3,
5162 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5163 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5164 else if (ABI_64_P (output_bfd
))
5165 memcpy (contents
+ rel
->r_offset
- 3,
5166 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5168 memcpy (contents
+ rel
->r_offset
- 3,
5169 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5170 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5176 if (htab
->elf
.sgot
== NULL
)
5179 off
= htab
->tls_ld_got
.offset
;
5184 Elf_Internal_Rela outrel
;
5186 if (htab
->elf
.srelgot
== NULL
)
5189 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5190 + htab
->elf
.sgot
->output_offset
+ off
);
5192 bfd_put_64 (output_bfd
, 0,
5193 htab
->elf
.sgot
->contents
+ off
);
5194 bfd_put_64 (output_bfd
, 0,
5195 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5196 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5197 outrel
.r_addend
= 0;
5198 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5200 htab
->tls_ld_got
.offset
|= 1;
5202 relocation
= htab
->elf
.sgot
->output_section
->vma
5203 + htab
->elf
.sgot
->output_offset
+ off
;
5204 unresolved_reloc
= FALSE
;
5207 case R_X86_64_DTPOFF32
:
5208 if (!bfd_link_executable (info
)
5209 || (input_section
->flags
& SEC_CODE
) == 0)
5210 relocation
-= elf_x86_64_dtpoff_base (info
);
5212 relocation
= elf_x86_64_tpoff (info
, relocation
);
5215 case R_X86_64_TPOFF32
:
5216 case R_X86_64_TPOFF64
:
5217 BFD_ASSERT (bfd_link_executable (info
));
5218 relocation
= elf_x86_64_tpoff (info
, relocation
);
5221 case R_X86_64_DTPOFF64
:
5222 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5223 relocation
-= elf_x86_64_dtpoff_base (info
);
5230 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5231 because such sections are not SEC_ALLOC and thus ld.so will
5232 not process them. */
5233 if (unresolved_reloc
5234 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5236 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5237 rel
->r_offset
) != (bfd_vma
) -1)
5239 (*_bfd_error_handler
)
5240 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5243 (long) rel
->r_offset
,
5245 h
->root
.root
.string
);
5250 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5251 contents
, rel
->r_offset
,
5252 relocation
, rel
->r_addend
);
5254 check_relocation_error
:
5255 if (r
!= bfd_reloc_ok
)
5260 name
= h
->root
.root
.string
;
5263 name
= bfd_elf_string_from_elf_section (input_bfd
,
5264 symtab_hdr
->sh_link
,
5269 name
= bfd_section_name (input_bfd
, sec
);
5272 if (r
== bfd_reloc_overflow
)
5274 if (! ((*info
->callbacks
->reloc_overflow
)
5275 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5276 (bfd_vma
) 0, input_bfd
, input_section
,
5282 (*_bfd_error_handler
)
5283 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5284 input_bfd
, input_section
,
5285 (long) rel
->r_offset
, name
, (int) r
);
5296 Elf_Internal_Shdr
*rel_hdr
;
5297 size_t deleted
= rel
- wrel
;
5299 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
5300 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5301 if (rel_hdr
->sh_size
== 0)
5303 /* It is too late to remove an empty reloc section. Leave
5305 ??? What is wrong with an empty section??? */
5306 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
5309 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
5310 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5311 input_section
->reloc_count
-= deleted
;
5317 /* Finish up dynamic symbol handling. We set the contents of various
5318 dynamic sections here. */
5321 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5322 struct bfd_link_info
*info
,
5323 struct elf_link_hash_entry
*h
,
5324 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5326 struct elf_x86_64_link_hash_table
*htab
;
5327 const struct elf_x86_64_backend_data
*abed
;
5328 bfd_boolean use_plt_bnd
;
5329 struct elf_x86_64_link_hash_entry
*eh
;
5331 htab
= elf_x86_64_hash_table (info
);
5335 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5336 section only if there is .plt section. */
5337 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5339 ? &elf_x86_64_bnd_arch_bed
5340 : get_elf_x86_64_backend_data (output_bfd
));
5342 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5344 if (h
->plt
.offset
!= (bfd_vma
) -1)
5347 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5348 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5349 Elf_Internal_Rela rela
;
5351 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5352 const struct elf_backend_data
*bed
;
5353 bfd_vma plt_got_pcrel_offset
;
5355 /* When building a static executable, use .iplt, .igot.plt and
5356 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5357 if (htab
->elf
.splt
!= NULL
)
5359 plt
= htab
->elf
.splt
;
5360 gotplt
= htab
->elf
.sgotplt
;
5361 relplt
= htab
->elf
.srelplt
;
5365 plt
= htab
->elf
.iplt
;
5366 gotplt
= htab
->elf
.igotplt
;
5367 relplt
= htab
->elf
.irelplt
;
5370 /* This symbol has an entry in the procedure linkage table. Set
5372 if ((h
->dynindx
== -1
5373 && !((h
->forced_local
|| bfd_link_executable (info
))
5375 && h
->type
== STT_GNU_IFUNC
))
5381 /* Get the index in the procedure linkage table which
5382 corresponds to this symbol. This is the index of this symbol
5383 in all the symbols for which we are making plt entries. The
5384 first entry in the procedure linkage table is reserved.
5386 Get the offset into the .got table of the entry that
5387 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5388 bytes. The first three are reserved for the dynamic linker.
5390 For static executables, we don't reserve anything. */
5392 if (plt
== htab
->elf
.splt
)
5394 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5395 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5399 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5400 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5403 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5404 plt_plt_offset
= abed
->plt_plt_offset
;
5405 plt_got_insn_size
= abed
->plt_got_insn_size
;
5406 plt_got_offset
= abed
->plt_got_offset
;
5409 /* Use the second PLT with BND relocations. */
5410 const bfd_byte
*plt_entry
, *plt2_entry
;
5412 if (eh
->has_bnd_reloc
)
5414 plt_entry
= elf_x86_64_bnd_plt_entry
;
5415 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5419 plt_entry
= elf_x86_64_legacy_plt_entry
;
5420 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5422 /* Subtract 1 since there is no BND prefix. */
5423 plt_plt_insn_end
-= 1;
5424 plt_plt_offset
-= 1;
5425 plt_got_insn_size
-= 1;
5426 plt_got_offset
-= 1;
5429 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5430 == sizeof (elf_x86_64_legacy_plt_entry
));
5432 /* Fill in the entry in the procedure linkage table. */
5433 memcpy (plt
->contents
+ h
->plt
.offset
,
5434 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5435 /* Fill in the entry in the second PLT. */
5436 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5437 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5439 resolved_plt
= htab
->plt_bnd
;
5440 plt_offset
= eh
->plt_bnd
.offset
;
5444 /* Fill in the entry in the procedure linkage table. */
5445 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5446 abed
->plt_entry_size
);
5449 plt_offset
= h
->plt
.offset
;
5452 /* Insert the relocation positions of the plt section. */
5454 /* Put offset the PC-relative instruction referring to the GOT entry,
5455 subtracting the size of that instruction. */
5456 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5457 + gotplt
->output_offset
5459 - resolved_plt
->output_section
->vma
5460 - resolved_plt
->output_offset
5462 - plt_got_insn_size
);
5464 /* Check PC-relative offset overflow in PLT entry. */
5465 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5466 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5467 output_bfd
, h
->root
.root
.string
);
5469 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5470 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5472 /* Fill in the entry in the global offset table, initially this
5473 points to the second part of the PLT entry. */
5474 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5475 + plt
->output_offset
5476 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5477 gotplt
->contents
+ got_offset
);
5479 /* Fill in the entry in the .rela.plt section. */
5480 rela
.r_offset
= (gotplt
->output_section
->vma
5481 + gotplt
->output_offset
5483 if (h
->dynindx
== -1
5484 || ((bfd_link_executable (info
)
5485 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5487 && h
->type
== STT_GNU_IFUNC
))
5489 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5490 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5491 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5492 rela
.r_addend
= (h
->root
.u
.def
.value
5493 + h
->root
.u
.def
.section
->output_section
->vma
5494 + h
->root
.u
.def
.section
->output_offset
);
5495 /* R_X86_64_IRELATIVE comes last. */
5496 plt_index
= htab
->next_irelative_index
--;
5500 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5502 plt_index
= htab
->next_jump_slot_index
++;
5505 /* Don't fill PLT entry for static executables. */
5506 if (plt
== htab
->elf
.splt
)
5508 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5510 /* Put relocation index. */
5511 bfd_put_32 (output_bfd
, plt_index
,
5512 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5514 /* Put offset for jmp .PLT0 and check for overflow. We don't
5515 check relocation index for overflow since branch displacement
5516 will overflow first. */
5517 if (plt0_offset
> 0x80000000)
5518 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5519 output_bfd
, h
->root
.root
.string
);
5520 bfd_put_32 (output_bfd
, - plt0_offset
,
5521 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5524 bed
= get_elf_backend_data (output_bfd
);
5525 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5526 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5528 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5530 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5531 asection
*plt
, *got
;
5532 bfd_boolean got_after_plt
;
5533 int32_t got_pcrel_offset
;
5534 const bfd_byte
*got_plt_entry
;
5536 /* Set the entry in the GOT procedure linkage table. */
5537 plt
= htab
->plt_got
;
5538 got
= htab
->elf
.sgot
;
5539 got_offset
= h
->got
.offset
;
5541 if (got_offset
== (bfd_vma
) -1
5542 || h
->type
== STT_GNU_IFUNC
5547 /* Use the second PLT entry template for the GOT PLT since they
5548 are the identical. */
5549 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5550 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5551 if (eh
->has_bnd_reloc
)
5552 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5555 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5557 /* Subtract 1 since there is no BND prefix. */
5558 plt_got_insn_size
-= 1;
5559 plt_got_offset
-= 1;
5562 /* Fill in the entry in the GOT procedure linkage table. */
5563 plt_offset
= eh
->plt_got
.offset
;
5564 memcpy (plt
->contents
+ plt_offset
,
5565 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5567 /* Put offset the PC-relative instruction referring to the GOT
5568 entry, subtracting the size of that instruction. */
5569 got_pcrel_offset
= (got
->output_section
->vma
5570 + got
->output_offset
5572 - plt
->output_section
->vma
5573 - plt
->output_offset
5575 - plt_got_insn_size
);
5577 /* Check PC-relative offset overflow in GOT PLT entry. */
5578 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5579 if ((got_after_plt
&& got_pcrel_offset
< 0)
5580 || (!got_after_plt
&& got_pcrel_offset
> 0))
5581 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5582 output_bfd
, h
->root
.root
.string
);
5584 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5585 plt
->contents
+ plt_offset
+ plt_got_offset
);
5589 && (h
->plt
.offset
!= (bfd_vma
) -1
5590 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5592 /* Mark the symbol as undefined, rather than as defined in
5593 the .plt section. Leave the value if there were any
5594 relocations where pointer equality matters (this is a clue
5595 for the dynamic linker, to make function pointer
5596 comparisons work between an application and shared
5597 library), otherwise set it to zero. If a function is only
5598 called from a binary, there is no need to slow down
5599 shared libraries because of that. */
5600 sym
->st_shndx
= SHN_UNDEF
;
5601 if (!h
->pointer_equality_needed
)
5605 if (h
->got
.offset
!= (bfd_vma
) -1
5606 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5607 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5609 Elf_Internal_Rela rela
;
5611 /* This symbol has an entry in the global offset table. Set it
5613 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5616 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5617 + htab
->elf
.sgot
->output_offset
5618 + (h
->got
.offset
&~ (bfd_vma
) 1));
5620 /* If this is a static link, or it is a -Bsymbolic link and the
5621 symbol is defined locally or was forced to be local because
5622 of a version file, we just want to emit a RELATIVE reloc.
5623 The entry in the global offset table will already have been
5624 initialized in the relocate_section function. */
5626 && h
->type
== STT_GNU_IFUNC
)
5628 if (bfd_link_pic (info
))
5630 /* Generate R_X86_64_GLOB_DAT. */
5637 if (!h
->pointer_equality_needed
)
5640 /* For non-shared object, we can't use .got.plt, which
5641 contains the real function addres if we need pointer
5642 equality. We load the GOT entry with the PLT entry. */
5643 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5644 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5645 + plt
->output_offset
5647 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5651 else if (bfd_link_pic (info
)
5652 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5654 if (!h
->def_regular
)
5656 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5657 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5658 rela
.r_addend
= (h
->root
.u
.def
.value
5659 + h
->root
.u
.def
.section
->output_section
->vma
5660 + h
->root
.u
.def
.section
->output_offset
);
5664 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5666 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5667 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5668 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5672 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5677 Elf_Internal_Rela rela
;
5679 /* This symbol needs a copy reloc. Set it up. */
5681 if (h
->dynindx
== -1
5682 || (h
->root
.type
!= bfd_link_hash_defined
5683 && h
->root
.type
!= bfd_link_hash_defweak
)
5684 || htab
->srelbss
== NULL
)
5687 rela
.r_offset
= (h
->root
.u
.def
.value
5688 + h
->root
.u
.def
.section
->output_section
->vma
5689 + h
->root
.u
.def
.section
->output_offset
);
5690 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5692 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5698 /* Finish up local dynamic symbol handling. We set the contents of
5699 various dynamic sections here. */
5702 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5704 struct elf_link_hash_entry
*h
5705 = (struct elf_link_hash_entry
*) *slot
;
5706 struct bfd_link_info
*info
5707 = (struct bfd_link_info
*) inf
;
5709 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5713 /* Used to decide how to sort relocs in an optimal manner for the
5714 dynamic linker, before writing them out. */
5716 static enum elf_reloc_type_class
5717 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
5718 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5719 const Elf_Internal_Rela
*rela
)
5721 bfd
*abfd
= info
->output_bfd
;
5722 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5723 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
5724 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
5725 Elf_Internal_Sym sym
;
5727 if (htab
->elf
.dynsym
== NULL
5728 || !bed
->s
->swap_symbol_in (abfd
,
5729 (htab
->elf
.dynsym
->contents
5730 + r_symndx
* bed
->s
->sizeof_sym
),
5734 /* Check relocation against STT_GNU_IFUNC symbol. */
5735 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5736 return reloc_class_ifunc
;
5738 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5740 case R_X86_64_RELATIVE
:
5741 case R_X86_64_RELATIVE64
:
5742 return reloc_class_relative
;
5743 case R_X86_64_JUMP_SLOT
:
5744 return reloc_class_plt
;
5746 return reloc_class_copy
;
5748 return reloc_class_normal
;
5752 /* Finish up the dynamic sections. */
5755 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5756 struct bfd_link_info
*info
)
5758 struct elf_x86_64_link_hash_table
*htab
;
5761 const struct elf_x86_64_backend_data
*abed
;
5763 htab
= elf_x86_64_hash_table (info
);
5767 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5768 section only if there is .plt section. */
5769 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5770 ? &elf_x86_64_bnd_arch_bed
5771 : get_elf_x86_64_backend_data (output_bfd
));
5773 dynobj
= htab
->elf
.dynobj
;
5774 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5776 if (htab
->elf
.dynamic_sections_created
)
5778 bfd_byte
*dyncon
, *dynconend
;
5779 const struct elf_backend_data
*bed
;
5780 bfd_size_type sizeof_dyn
;
5782 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5785 bed
= get_elf_backend_data (dynobj
);
5786 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5787 dyncon
= sdyn
->contents
;
5788 dynconend
= sdyn
->contents
+ sdyn
->size
;
5789 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5791 Elf_Internal_Dyn dyn
;
5794 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5802 s
= htab
->elf
.sgotplt
;
5803 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5807 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5811 s
= htab
->elf
.srelplt
->output_section
;
5812 dyn
.d_un
.d_val
= s
->size
;
5816 /* The procedure linkage table relocs (DT_JMPREL) should
5817 not be included in the overall relocs (DT_RELA).
5818 Therefore, we override the DT_RELASZ entry here to
5819 make it not include the JMPREL relocs. Since the
5820 linker script arranges for .rela.plt to follow all
5821 other relocation sections, we don't have to worry
5822 about changing the DT_RELA entry. */
5823 if (htab
->elf
.srelplt
!= NULL
)
5825 s
= htab
->elf
.srelplt
->output_section
;
5826 dyn
.d_un
.d_val
-= s
->size
;
5830 case DT_TLSDESC_PLT
:
5832 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5833 + htab
->tlsdesc_plt
;
5836 case DT_TLSDESC_GOT
:
5838 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5839 + htab
->tlsdesc_got
;
5843 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5846 /* Fill in the special first entry in the procedure linkage table. */
5847 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5849 /* Fill in the first entry in the procedure linkage table. */
5850 memcpy (htab
->elf
.splt
->contents
,
5851 abed
->plt0_entry
, abed
->plt_entry_size
);
5852 /* Add offset for pushq GOT+8(%rip), since the instruction
5853 uses 6 bytes subtract this value. */
5854 bfd_put_32 (output_bfd
,
5855 (htab
->elf
.sgotplt
->output_section
->vma
5856 + htab
->elf
.sgotplt
->output_offset
5858 - htab
->elf
.splt
->output_section
->vma
5859 - htab
->elf
.splt
->output_offset
5861 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5862 /* Add offset for the PC-relative instruction accessing GOT+16,
5863 subtracting the offset to the end of that instruction. */
5864 bfd_put_32 (output_bfd
,
5865 (htab
->elf
.sgotplt
->output_section
->vma
5866 + htab
->elf
.sgotplt
->output_offset
5868 - htab
->elf
.splt
->output_section
->vma
5869 - htab
->elf
.splt
->output_offset
5870 - abed
->plt0_got2_insn_end
),
5871 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5873 elf_section_data (htab
->elf
.splt
->output_section
)
5874 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5876 if (htab
->tlsdesc_plt
)
5878 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5879 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5881 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5882 abed
->plt0_entry
, abed
->plt_entry_size
);
5884 /* Add offset for pushq GOT+8(%rip), since the
5885 instruction uses 6 bytes subtract this value. */
5886 bfd_put_32 (output_bfd
,
5887 (htab
->elf
.sgotplt
->output_section
->vma
5888 + htab
->elf
.sgotplt
->output_offset
5890 - htab
->elf
.splt
->output_section
->vma
5891 - htab
->elf
.splt
->output_offset
5894 htab
->elf
.splt
->contents
5895 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5896 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5897 where TGD stands for htab->tlsdesc_got, subtracting the offset
5898 to the end of that instruction. */
5899 bfd_put_32 (output_bfd
,
5900 (htab
->elf
.sgot
->output_section
->vma
5901 + htab
->elf
.sgot
->output_offset
5903 - htab
->elf
.splt
->output_section
->vma
5904 - htab
->elf
.splt
->output_offset
5906 - abed
->plt0_got2_insn_end
),
5907 htab
->elf
.splt
->contents
5908 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5913 if (htab
->plt_bnd
!= NULL
)
5914 elf_section_data (htab
->plt_bnd
->output_section
)
5915 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5917 if (htab
->elf
.sgotplt
)
5919 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5921 (*_bfd_error_handler
)
5922 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5926 /* Fill in the first three entries in the global offset table. */
5927 if (htab
->elf
.sgotplt
->size
> 0)
5929 /* Set the first entry in the global offset table to the address of
5930 the dynamic section. */
5932 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5934 bfd_put_64 (output_bfd
,
5935 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5936 htab
->elf
.sgotplt
->contents
);
5937 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5938 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5939 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5942 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5946 /* Adjust .eh_frame for .plt section. */
5947 if (htab
->plt_eh_frame
!= NULL
5948 && htab
->plt_eh_frame
->contents
!= NULL
)
5950 if (htab
->elf
.splt
!= NULL
5951 && htab
->elf
.splt
->size
!= 0
5952 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5953 && htab
->elf
.splt
->output_section
!= NULL
5954 && htab
->plt_eh_frame
->output_section
!= NULL
)
5956 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5957 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5958 + htab
->plt_eh_frame
->output_offset
5959 + PLT_FDE_START_OFFSET
;
5960 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5961 htab
->plt_eh_frame
->contents
5962 + PLT_FDE_START_OFFSET
);
5964 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5966 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5968 htab
->plt_eh_frame
->contents
))
5973 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5974 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5977 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5978 htab_traverse (htab
->loc_hash_table
,
5979 elf_x86_64_finish_local_dynamic_symbol
,
5985 /* Return an array of PLT entry symbol values. */
5988 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
5991 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5994 bfd_vma
*plt_sym_val
;
5996 bfd_byte
*plt_contents
;
5997 const struct elf_x86_64_backend_data
*bed
;
5998 Elf_Internal_Shdr
*hdr
;
6001 /* Get the .plt section contents. PLT passed down may point to the
6002 .plt.bnd section. Make sure that PLT always points to the .plt
6004 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6009 plt
= bfd_get_section_by_name (abfd
, ".plt");
6012 bed
= &elf_x86_64_bnd_arch_bed
;
6015 bed
= get_elf_x86_64_backend_data (abfd
);
6017 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
6018 if (plt_contents
== NULL
)
6020 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
6021 plt_contents
, 0, plt
->size
))
6024 free (plt_contents
);
6028 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
6029 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
6032 hdr
= &elf_section_data (relplt
)->this_hdr
;
6033 count
= relplt
->size
/ hdr
->sh_entsize
;
6035 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
6036 if (plt_sym_val
== NULL
)
6039 for (i
= 0; i
< count
; i
++)
6040 plt_sym_val
[i
] = -1;
6042 plt_offset
= bed
->plt_entry_size
;
6043 p
= relplt
->relocation
;
6044 for (i
= 0; i
< count
; i
++, p
++)
6048 /* Skip unknown relocation. */
6049 if (p
->howto
== NULL
)
6052 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
6053 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
6056 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
6057 + bed
->plt_reloc_offset
));
6058 if (reloc_index
>= count
)
6062 /* This is the index in .plt section. */
6063 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
6064 /* Store VMA + the offset in .plt.bnd section. */
6065 plt_sym_val
[reloc_index
] =
6067 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
6070 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
6071 plt_offset
+= bed
->plt_entry_size
;
6073 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6075 if (plt_offset
>= plt
->size
)
6079 free (plt_contents
);
6084 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6088 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
6095 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6096 as PLT if it exists. */
6097 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6099 plt
= bfd_get_section_by_name (abfd
, ".plt");
6100 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
6101 dynsymcount
, dynsyms
, ret
,
6103 elf_x86_64_get_plt_sym_val
);
6106 /* Handle an x86-64 specific section when reading an object file. This
6107 is called when elfcode.h finds a section with an unknown type. */
6110 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
6111 const char *name
, int shindex
)
6113 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
6116 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
6122 /* Hook called by the linker routine which adds symbols from an object
6123 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6127 elf_x86_64_add_symbol_hook (bfd
*abfd
,
6128 struct bfd_link_info
*info
,
6129 Elf_Internal_Sym
*sym
,
6130 const char **namep ATTRIBUTE_UNUSED
,
6131 flagword
*flagsp ATTRIBUTE_UNUSED
,
6137 switch (sym
->st_shndx
)
6139 case SHN_X86_64_LCOMMON
:
6140 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
6143 lcomm
= bfd_make_section_with_flags (abfd
,
6147 | SEC_LINKER_CREATED
));
6150 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
6153 *valp
= sym
->st_size
;
6157 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
6158 && (abfd
->flags
& DYNAMIC
) == 0
6159 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
6160 elf_tdata (info
->output_bfd
)->has_gnu_symbols
6161 |= elf_gnu_symbol_unique
;
6167 /* Given a BFD section, try to locate the corresponding ELF section
6171 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
6172 asection
*sec
, int *index_return
)
6174 if (sec
== &_bfd_elf_large_com_section
)
6176 *index_return
= SHN_X86_64_LCOMMON
;
6182 /* Process a symbol. */
6185 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
6188 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
6190 switch (elfsym
->internal_elf_sym
.st_shndx
)
6192 case SHN_X86_64_LCOMMON
:
6193 asym
->section
= &_bfd_elf_large_com_section
;
6194 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6195 /* Common symbol doesn't set BSF_GLOBAL. */
6196 asym
->flags
&= ~BSF_GLOBAL
;
6202 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6204 return (sym
->st_shndx
== SHN_COMMON
6205 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6209 elf_x86_64_common_section_index (asection
*sec
)
6211 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6214 return SHN_X86_64_LCOMMON
;
6218 elf_x86_64_common_section (asection
*sec
)
6220 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6221 return bfd_com_section_ptr
;
6223 return &_bfd_elf_large_com_section
;
6227 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6228 const Elf_Internal_Sym
*sym
,
6233 const asection
*oldsec
)
6235 /* A normal common symbol and a large common symbol result in a
6236 normal common symbol. We turn the large common symbol into a
6239 && h
->root
.type
== bfd_link_hash_common
6241 && bfd_is_com_section (*psec
)
6244 if (sym
->st_shndx
== SHN_COMMON
6245 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6247 h
->root
.u
.c
.p
->section
6248 = bfd_make_section_old_way (oldbfd
, "COMMON");
6249 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6251 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6252 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6253 *psec
= bfd_com_section_ptr
;
6260 elf_x86_64_additional_program_headers (bfd
*abfd
,
6261 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6266 /* Check to see if we need a large readonly segment. */
6267 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6268 if (s
&& (s
->flags
& SEC_LOAD
))
6271 /* Check to see if we need a large data segment. Since .lbss sections
6272 is placed right after the .bss section, there should be no need for
6273 a large data segment just because of .lbss. */
6274 s
= bfd_get_section_by_name (abfd
, ".ldata");
6275 if (s
&& (s
->flags
& SEC_LOAD
))
6281 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6284 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6286 if (h
->plt
.offset
!= (bfd_vma
) -1
6288 && !h
->pointer_equality_needed
)
6291 return _bfd_elf_hash_symbol (h
);
6294 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6297 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6298 const bfd_target
*output
)
6300 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6301 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6302 && _bfd_elf_relocs_compatible (input
, output
));
6305 static const struct bfd_elf_special_section
6306 elf_x86_64_special_sections
[]=
6308 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6309 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6310 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6311 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6312 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6313 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6314 { NULL
, 0, 0, 0, 0 }
6317 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6318 #define TARGET_LITTLE_NAME "elf64-x86-64"
6319 #define ELF_ARCH bfd_arch_i386
6320 #define ELF_TARGET_ID X86_64_ELF_DATA
6321 #define ELF_MACHINE_CODE EM_X86_64
6322 #define ELF_MAXPAGESIZE 0x200000
6323 #define ELF_MINPAGESIZE 0x1000
6324 #define ELF_COMMONPAGESIZE 0x1000
6326 #define elf_backend_can_gc_sections 1
6327 #define elf_backend_can_refcount 1
6328 #define elf_backend_want_got_plt 1
6329 #define elf_backend_plt_readonly 1
6330 #define elf_backend_want_plt_sym 0
6331 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6332 #define elf_backend_rela_normal 1
6333 #define elf_backend_plt_alignment 4
6334 #define elf_backend_extern_protected_data 1
6336 #define elf_info_to_howto elf_x86_64_info_to_howto
6338 #define bfd_elf64_bfd_link_hash_table_create \
6339 elf_x86_64_link_hash_table_create
6340 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6341 #define bfd_elf64_bfd_reloc_name_lookup \
6342 elf_x86_64_reloc_name_lookup
6344 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6345 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6346 #define elf_backend_check_relocs elf_x86_64_check_relocs
6347 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6348 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6349 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6350 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6351 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6352 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6353 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6354 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6356 #define elf_backend_write_core_note elf_x86_64_write_core_note
6358 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6359 #define elf_backend_relocate_section elf_x86_64_relocate_section
6360 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6361 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6362 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6363 #define elf_backend_object_p elf64_x86_64_elf_object_p
6364 #define bfd_elf64_mkobject elf_x86_64_mkobject
6365 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6367 #define elf_backend_section_from_shdr \
6368 elf_x86_64_section_from_shdr
6370 #define elf_backend_section_from_bfd_section \
6371 elf_x86_64_elf_section_from_bfd_section
6372 #define elf_backend_add_symbol_hook \
6373 elf_x86_64_add_symbol_hook
6374 #define elf_backend_symbol_processing \
6375 elf_x86_64_symbol_processing
6376 #define elf_backend_common_section_index \
6377 elf_x86_64_common_section_index
6378 #define elf_backend_common_section \
6379 elf_x86_64_common_section
6380 #define elf_backend_common_definition \
6381 elf_x86_64_common_definition
6382 #define elf_backend_merge_symbol \
6383 elf_x86_64_merge_symbol
6384 #define elf_backend_special_sections \
6385 elf_x86_64_special_sections
6386 #define elf_backend_additional_program_headers \
6387 elf_x86_64_additional_program_headers
6388 #define elf_backend_hash_symbol \
6389 elf_x86_64_hash_symbol
6391 #include "elf64-target.h"
6393 /* CloudABI support. */
6395 #undef TARGET_LITTLE_SYM
6396 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6397 #undef TARGET_LITTLE_NAME
6398 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6401 #define ELF_OSABI ELFOSABI_CLOUDABI
6404 #define elf64_bed elf64_x86_64_cloudabi_bed
6406 #include "elf64-target.h"
6408 /* FreeBSD support. */
6410 #undef TARGET_LITTLE_SYM
6411 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6412 #undef TARGET_LITTLE_NAME
6413 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6416 #define ELF_OSABI ELFOSABI_FREEBSD
6419 #define elf64_bed elf64_x86_64_fbsd_bed
6421 #include "elf64-target.h"
6423 /* Solaris 2 support. */
6425 #undef TARGET_LITTLE_SYM
6426 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6427 #undef TARGET_LITTLE_NAME
6428 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6430 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6431 objects won't be recognized. */
6435 #define elf64_bed elf64_x86_64_sol2_bed
6437 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6439 #undef elf_backend_static_tls_alignment
6440 #define elf_backend_static_tls_alignment 16
6442 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6444 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6446 #undef elf_backend_want_plt_sym
6447 #define elf_backend_want_plt_sym 1
6449 #include "elf64-target.h"
6451 /* Native Client support. */
6454 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6456 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6457 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6461 #undef TARGET_LITTLE_SYM
6462 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6463 #undef TARGET_LITTLE_NAME
6464 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6466 #define elf64_bed elf64_x86_64_nacl_bed
6468 #undef ELF_MAXPAGESIZE
6469 #undef ELF_MINPAGESIZE
6470 #undef ELF_COMMONPAGESIZE
6471 #define ELF_MAXPAGESIZE 0x10000
6472 #define ELF_MINPAGESIZE 0x10000
6473 #define ELF_COMMONPAGESIZE 0x10000
6475 /* Restore defaults. */
6477 #undef elf_backend_static_tls_alignment
6478 #undef elf_backend_want_plt_sym
6479 #define elf_backend_want_plt_sym 0
6481 /* NaCl uses substantially different PLT entries for the same effects. */
6483 #undef elf_backend_plt_alignment
6484 #define elf_backend_plt_alignment 5
6485 #define NACL_PLT_ENTRY_SIZE 64
6486 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6488 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6490 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6491 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6492 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6493 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6494 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6496 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6497 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6499 /* 32 bytes of nop to pad out to the standard size. */
6500 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6501 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6502 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6503 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6504 0x66, /* excess data32 prefix */
6508 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6510 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6511 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6512 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6513 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6515 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6516 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6517 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6519 /* Lazy GOT entries point here (32-byte aligned). */
6520 0x68, /* pushq immediate */
6521 0, 0, 0, 0, /* replaced with index into relocation table. */
6522 0xe9, /* jmp relative */
6523 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6525 /* 22 bytes of nop to pad out to the standard size. */
6526 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6527 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6528 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6531 /* .eh_frame covering the .plt section. */
6533 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6535 #if (PLT_CIE_LENGTH != 20 \
6536 || PLT_FDE_LENGTH != 36 \
6537 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6538 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6539 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6541 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6542 0, 0, 0, 0, /* CIE ID */
6543 1, /* CIE version */
6544 'z', 'R', 0, /* Augmentation string */
6545 1, /* Code alignment factor */
6546 0x78, /* Data alignment factor */
6547 16, /* Return address column */
6548 1, /* Augmentation size */
6549 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6550 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6551 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6552 DW_CFA_nop
, DW_CFA_nop
,
6554 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6555 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6556 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6557 0, 0, 0, 0, /* .plt size goes here */
6558 0, /* Augmentation size */
6559 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6560 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6561 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6562 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6563 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6564 13, /* Block length */
6565 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6566 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6567 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6568 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6569 DW_CFA_nop
, DW_CFA_nop
6572 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6574 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6575 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6576 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6577 2, /* plt0_got1_offset */
6578 9, /* plt0_got2_offset */
6579 13, /* plt0_got2_insn_end */
6580 3, /* plt_got_offset */
6581 33, /* plt_reloc_offset */
6582 38, /* plt_plt_offset */
6583 7, /* plt_got_insn_size */
6584 42, /* plt_plt_insn_end */
6585 32, /* plt_lazy_offset */
6586 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6587 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6590 #undef elf_backend_arch_data
6591 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6593 #undef elf_backend_object_p
6594 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6595 #undef elf_backend_modify_segment_map
6596 #define elf_backend_modify_segment_map nacl_modify_segment_map
6597 #undef elf_backend_modify_program_headers
6598 #define elf_backend_modify_program_headers nacl_modify_program_headers
6599 #undef elf_backend_final_write_processing
6600 #define elf_backend_final_write_processing nacl_final_write_processing
6602 #include "elf64-target.h"
6604 /* Native Client x32 support. */
6607 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6609 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6610 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6614 #undef TARGET_LITTLE_SYM
6615 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6616 #undef TARGET_LITTLE_NAME
6617 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6619 #define elf32_bed elf32_x86_64_nacl_bed
6621 #define bfd_elf32_bfd_link_hash_table_create \
6622 elf_x86_64_link_hash_table_create
6623 #define bfd_elf32_bfd_reloc_type_lookup \
6624 elf_x86_64_reloc_type_lookup
6625 #define bfd_elf32_bfd_reloc_name_lookup \
6626 elf_x86_64_reloc_name_lookup
6627 #define bfd_elf32_mkobject \
6629 #define bfd_elf32_get_synthetic_symtab \
6630 elf_x86_64_get_synthetic_symtab
6632 #undef elf_backend_object_p
6633 #define elf_backend_object_p \
6634 elf32_x86_64_nacl_elf_object_p
6636 #undef elf_backend_bfd_from_remote_memory
6637 #define elf_backend_bfd_from_remote_memory \
6638 _bfd_elf32_bfd_from_remote_memory
6640 #undef elf_backend_size_info
6641 #define elf_backend_size_info \
6642 _bfd_elf32_size_info
6644 #include "elf32-target.h"
6646 /* Restore defaults. */
6647 #undef elf_backend_object_p
6648 #define elf_backend_object_p elf64_x86_64_elf_object_p
6649 #undef elf_backend_bfd_from_remote_memory
6650 #undef elf_backend_size_info
6651 #undef elf_backend_modify_segment_map
6652 #undef elf_backend_modify_program_headers
6653 #undef elf_backend_final_write_processing
6655 /* Intel L1OM support. */
6658 elf64_l1om_elf_object_p (bfd
*abfd
)
6660 /* Set the right machine number for an L1OM elf64 file. */
6661 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6665 #undef TARGET_LITTLE_SYM
6666 #define TARGET_LITTLE_SYM l1om_elf64_vec
6667 #undef TARGET_LITTLE_NAME
6668 #define TARGET_LITTLE_NAME "elf64-l1om"
6670 #define ELF_ARCH bfd_arch_l1om
6672 #undef ELF_MACHINE_CODE
6673 #define ELF_MACHINE_CODE EM_L1OM
6678 #define elf64_bed elf64_l1om_bed
6680 #undef elf_backend_object_p
6681 #define elf_backend_object_p elf64_l1om_elf_object_p
6683 /* Restore defaults. */
6684 #undef ELF_MAXPAGESIZE
6685 #undef ELF_MINPAGESIZE
6686 #undef ELF_COMMONPAGESIZE
6687 #define ELF_MAXPAGESIZE 0x200000
6688 #define ELF_MINPAGESIZE 0x1000
6689 #define ELF_COMMONPAGESIZE 0x1000
6690 #undef elf_backend_plt_alignment
6691 #define elf_backend_plt_alignment 4
6692 #undef elf_backend_arch_data
6693 #define elf_backend_arch_data &elf_x86_64_arch_bed
6695 #include "elf64-target.h"
6697 /* FreeBSD L1OM support. */
6699 #undef TARGET_LITTLE_SYM
6700 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6701 #undef TARGET_LITTLE_NAME
6702 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6705 #define ELF_OSABI ELFOSABI_FREEBSD
6708 #define elf64_bed elf64_l1om_fbsd_bed
6710 #include "elf64-target.h"
6712 /* Intel K1OM support. */
6715 elf64_k1om_elf_object_p (bfd
*abfd
)
6717 /* Set the right machine number for an K1OM elf64 file. */
6718 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6722 #undef TARGET_LITTLE_SYM
6723 #define TARGET_LITTLE_SYM k1om_elf64_vec
6724 #undef TARGET_LITTLE_NAME
6725 #define TARGET_LITTLE_NAME "elf64-k1om"
6727 #define ELF_ARCH bfd_arch_k1om
6729 #undef ELF_MACHINE_CODE
6730 #define ELF_MACHINE_CODE EM_K1OM
6735 #define elf64_bed elf64_k1om_bed
6737 #undef elf_backend_object_p
6738 #define elf_backend_object_p elf64_k1om_elf_object_p
6740 #undef elf_backend_static_tls_alignment
6742 #undef elf_backend_want_plt_sym
6743 #define elf_backend_want_plt_sym 0
6745 #include "elf64-target.h"
6747 /* FreeBSD K1OM support. */
6749 #undef TARGET_LITTLE_SYM
6750 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6751 #undef TARGET_LITTLE_NAME
6752 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6755 #define ELF_OSABI ELFOSABI_FREEBSD
6758 #define elf64_bed elf64_k1om_fbsd_bed
6760 #include "elf64-target.h"
6762 /* 32bit x86-64 support. */
6764 #undef TARGET_LITTLE_SYM
6765 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6766 #undef TARGET_LITTLE_NAME
6767 #define TARGET_LITTLE_NAME "elf32-x86-64"
6771 #define ELF_ARCH bfd_arch_i386
6773 #undef ELF_MACHINE_CODE
6774 #define ELF_MACHINE_CODE EM_X86_64
6778 #undef elf_backend_object_p
6779 #define elf_backend_object_p \
6780 elf32_x86_64_elf_object_p
6782 #undef elf_backend_bfd_from_remote_memory
6783 #define elf_backend_bfd_from_remote_memory \
6784 _bfd_elf32_bfd_from_remote_memory
6786 #undef elf_backend_size_info
6787 #define elf_backend_size_info \
6788 _bfd_elf32_size_info
6790 #include "elf32-target.h"