1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "opcode/i386.h"
35 #include "elf/x86-64.h"
42 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
43 #define MINUS_ONE (~ (bfd_vma) 0)
45 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
46 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
47 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
48 since they are the same. */
50 #define ABI_64_P(abfd) \
51 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
53 /* The relocation "howto" table. Order of fields:
54 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
55 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
56 static reloc_howto_type x86_64_elf_howto_table
[] =
58 HOWTO(R_X86_64_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
59 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
61 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
64 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
65 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
67 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
68 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
70 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
71 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
73 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
74 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
76 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
77 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
79 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
80 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
82 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
85 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
86 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
88 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
89 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
91 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
92 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
94 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
96 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
97 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
98 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
99 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
100 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
101 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
102 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
103 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
105 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
106 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
108 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
109 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
111 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
112 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
114 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
115 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
117 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
118 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
120 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
121 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
123 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
124 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
126 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
127 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
129 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
130 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
131 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
132 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
133 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
134 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
135 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
136 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
138 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
139 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
141 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
142 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
143 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
144 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
145 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
147 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
148 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
150 HOWTO(R_X86_64_SIZE32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
151 bfd_elf_generic_reloc
, "R_X86_64_SIZE32", FALSE
, 0xffffffff, 0xffffffff,
153 HOWTO(R_X86_64_SIZE64
, 0, 4, 64, FALSE
, 0, complain_overflow_unsigned
,
154 bfd_elf_generic_reloc
, "R_X86_64_SIZE64", FALSE
, MINUS_ONE
, MINUS_ONE
,
156 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
157 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
158 "R_X86_64_GOTPC32_TLSDESC",
159 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
160 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
161 complain_overflow_dont
, bfd_elf_generic_reloc
,
162 "R_X86_64_TLSDESC_CALL",
164 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
165 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
167 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
168 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
169 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
171 HOWTO(R_X86_64_RELATIVE64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
172 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE64", FALSE
, MINUS_ONE
,
174 HOWTO(R_X86_64_PC32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
175 bfd_elf_generic_reloc
, "R_X86_64_PC32_BND", FALSE
, 0xffffffff, 0xffffffff,
177 HOWTO(R_X86_64_PLT32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
178 bfd_elf_generic_reloc
, "R_X86_64_PLT32_BND", FALSE
, 0xffffffff, 0xffffffff,
180 HOWTO(R_X86_64_GOTPCRELX
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
181 bfd_elf_generic_reloc
, "R_X86_64_GOTPCRELX", FALSE
, 0xffffffff,
183 HOWTO(R_X86_64_REX_GOTPCRELX
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
184 bfd_elf_generic_reloc
, "R_X86_64_REX_GOTPCRELX", FALSE
, 0xffffffff,
187 /* We have a gap in the reloc numbers here.
188 R_X86_64_standard counts the number up to this point, and
189 R_X86_64_vt_offset is the value to subtract from a reloc type of
190 R_X86_64_GNU_VT* to form an index into this table. */
191 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
192 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
194 /* GNU extension to record C++ vtable hierarchy. */
195 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
196 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
198 /* GNU extension to record C++ vtable member usage. */
199 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
200 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
203 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
204 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
205 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
209 #define IS_X86_64_PCREL_TYPE(TYPE) \
210 ( ((TYPE) == R_X86_64_PC8) \
211 || ((TYPE) == R_X86_64_PC16) \
212 || ((TYPE) == R_X86_64_PC32) \
213 || ((TYPE) == R_X86_64_PC32_BND) \
214 || ((TYPE) == R_X86_64_PC64))
216 /* Map BFD relocs to the x86_64 elf relocs. */
219 bfd_reloc_code_real_type bfd_reloc_val
;
220 unsigned char elf_reloc_val
;
223 static const struct elf_reloc_map x86_64_reloc_map
[] =
225 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
226 { BFD_RELOC_64
, R_X86_64_64
, },
227 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
228 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
229 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
230 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
231 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
232 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
233 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
234 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
235 { BFD_RELOC_32
, R_X86_64_32
, },
236 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
237 { BFD_RELOC_16
, R_X86_64_16
, },
238 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
239 { BFD_RELOC_8
, R_X86_64_8
, },
240 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
241 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
242 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
243 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
244 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
245 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
246 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
247 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
248 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
249 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
250 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
251 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
252 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
253 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
254 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
255 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
256 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
257 { BFD_RELOC_SIZE32
, R_X86_64_SIZE32
, },
258 { BFD_RELOC_SIZE64
, R_X86_64_SIZE64
, },
259 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
260 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
261 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
262 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
263 { BFD_RELOC_X86_64_PC32_BND
, R_X86_64_PC32_BND
, },
264 { BFD_RELOC_X86_64_PLT32_BND
, R_X86_64_PLT32_BND
, },
265 { BFD_RELOC_X86_64_GOTPCRELX
, R_X86_64_GOTPCRELX
, },
266 { BFD_RELOC_X86_64_REX_GOTPCRELX
, R_X86_64_REX_GOTPCRELX
, },
267 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
268 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
271 static reloc_howto_type
*
272 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
276 if (r_type
== (unsigned int) R_X86_64_32
)
281 i
= ARRAY_SIZE (x86_64_elf_howto_table
) - 1;
283 else if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
284 || r_type
>= (unsigned int) R_X86_64_max
)
286 if (r_type
>= (unsigned int) R_X86_64_standard
)
288 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
290 r_type
= R_X86_64_NONE
;
295 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
296 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
297 return &x86_64_elf_howto_table
[i
];
300 /* Given a BFD reloc type, return a HOWTO structure. */
301 static reloc_howto_type
*
302 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
303 bfd_reloc_code_real_type code
)
307 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
310 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
311 return elf_x86_64_rtype_to_howto (abfd
,
312 x86_64_reloc_map
[i
].elf_reloc_val
);
317 static reloc_howto_type
*
318 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
323 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
325 /* Get x32 R_X86_64_32. */
326 reloc_howto_type
*reloc
327 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
328 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
332 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
333 if (x86_64_elf_howto_table
[i
].name
!= NULL
334 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
335 return &x86_64_elf_howto_table
[i
];
340 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
343 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
344 Elf_Internal_Rela
*dst
)
348 r_type
= ELF32_R_TYPE (dst
->r_info
);
349 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
350 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
353 /* Support for core dump NOTE sections. */
355 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
360 switch (note
->descsz
)
365 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
367 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
370 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
378 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
380 elf_tdata (abfd
)->core
->signal
381 = bfd_get_16 (abfd
, note
->descdata
+ 12);
384 elf_tdata (abfd
)->core
->lwpid
385 = bfd_get_32 (abfd
, note
->descdata
+ 32);
394 /* Make a ".reg/999" section. */
395 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
396 size
, note
->descpos
+ offset
);
400 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
402 switch (note
->descsz
)
407 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
408 elf_tdata (abfd
)->core
->pid
409 = bfd_get_32 (abfd
, note
->descdata
+ 12);
410 elf_tdata (abfd
)->core
->program
411 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
412 elf_tdata (abfd
)->core
->command
413 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
416 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
417 elf_tdata (abfd
)->core
->pid
418 = bfd_get_32 (abfd
, note
->descdata
+ 24);
419 elf_tdata (abfd
)->core
->program
420 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
421 elf_tdata (abfd
)->core
->command
422 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
425 /* Note that for some reason, a spurious space is tacked
426 onto the end of the args in some (at least one anyway)
427 implementations, so strip it off if it exists. */
430 char *command
= elf_tdata (abfd
)->core
->command
;
431 int n
= strlen (command
);
433 if (0 < n
&& command
[n
- 1] == ' ')
434 command
[n
- 1] = '\0';
442 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
445 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
447 const char *fname
, *psargs
;
458 va_start (ap
, note_type
);
459 fname
= va_arg (ap
, const char *);
460 psargs
= va_arg (ap
, const char *);
463 if (bed
->s
->elfclass
== ELFCLASS32
)
466 memset (&data
, 0, sizeof (data
));
467 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
468 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
469 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
470 &data
, sizeof (data
));
475 memset (&data
, 0, sizeof (data
));
476 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
477 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
478 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
479 &data
, sizeof (data
));
484 va_start (ap
, note_type
);
485 pid
= va_arg (ap
, long);
486 cursig
= va_arg (ap
, int);
487 gregs
= va_arg (ap
, const void *);
490 if (bed
->s
->elfclass
== ELFCLASS32
)
492 if (bed
->elf_machine_code
== EM_X86_64
)
494 prstatusx32_t prstat
;
495 memset (&prstat
, 0, sizeof (prstat
));
497 prstat
.pr_cursig
= cursig
;
498 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
499 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
500 &prstat
, sizeof (prstat
));
505 memset (&prstat
, 0, sizeof (prstat
));
507 prstat
.pr_cursig
= cursig
;
508 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
509 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
510 &prstat
, sizeof (prstat
));
516 memset (&prstat
, 0, sizeof (prstat
));
518 prstat
.pr_cursig
= cursig
;
519 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
520 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
521 &prstat
, sizeof (prstat
));
528 /* Functions for the x86-64 ELF linker. */
530 /* The name of the dynamic interpreter. This is put in the .interp
533 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
534 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
536 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
537 copying dynamic variables from a shared lib into an app's dynbss
538 section, and instead use a dynamic relocation to point into the
540 #define ELIMINATE_COPY_RELOCS 1
542 /* The size in bytes of an entry in the global offset table. */
544 #define GOT_ENTRY_SIZE 8
546 /* The size in bytes of an entry in the procedure linkage table. */
548 #define PLT_ENTRY_SIZE 16
550 /* The first entry in a procedure linkage table looks like this. See the
551 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
553 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
555 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
556 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
557 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
560 /* Subsequent entries in a procedure linkage table look like this. */
562 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
564 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
565 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
566 0x68, /* pushq immediate */
567 0, 0, 0, 0, /* replaced with index into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
572 /* The first entry in a procedure linkage table with BND relocations
575 static const bfd_byte elf_x86_64_bnd_plt0_entry
[PLT_ENTRY_SIZE
] =
577 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
578 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
579 0x0f, 0x1f, 0 /* nopl (%rax) */
582 /* Subsequent entries for legacy branches in a procedure linkage table
583 with BND relocations look like this. */
585 static const bfd_byte elf_x86_64_legacy_plt_entry
[PLT_ENTRY_SIZE
] =
587 0x68, 0, 0, 0, 0, /* pushq immediate */
588 0xe9, 0, 0, 0, 0, /* jmpq relative */
589 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
592 /* Subsequent entries for branches with BND prefx in a procedure linkage
593 table with BND relocations look like this. */
595 static const bfd_byte elf_x86_64_bnd_plt_entry
[PLT_ENTRY_SIZE
] =
597 0x68, 0, 0, 0, 0, /* pushq immediate */
598 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
599 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
602 /* Entries for legacy branches in the second procedure linkage table
605 static const bfd_byte elf_x86_64_legacy_plt2_entry
[8] =
607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
612 /* Entries for branches with BND prefix in the second procedure linkage
613 table look like this. */
615 static const bfd_byte elf_x86_64_bnd_plt2_entry
[8] =
617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
622 /* .eh_frame covering the .plt section. */
624 static const bfd_byte elf_x86_64_eh_frame_plt
[] =
626 #define PLT_CIE_LENGTH 20
627 #define PLT_FDE_LENGTH 36
628 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
629 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
630 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
631 0, 0, 0, 0, /* CIE ID */
633 'z', 'R', 0, /* Augmentation string */
634 1, /* Code alignment factor */
635 0x78, /* Data alignment factor */
636 16, /* Return address column */
637 1, /* Augmentation size */
638 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
639 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
640 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
641 DW_CFA_nop
, DW_CFA_nop
,
643 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
644 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
645 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
646 0, 0, 0, 0, /* .plt size goes here */
647 0, /* Augmentation size */
648 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
649 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
650 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
651 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
652 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
653 11, /* Block length */
654 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
655 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
656 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
657 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
658 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
661 /* Architecture-specific backend data for x86-64. */
663 struct elf_x86_64_backend_data
665 /* Templates for the initial PLT entry and for subsequent entries. */
666 const bfd_byte
*plt0_entry
;
667 const bfd_byte
*plt_entry
;
668 unsigned int plt_entry_size
; /* Size of each PLT entry. */
670 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
671 unsigned int plt0_got1_offset
;
672 unsigned int plt0_got2_offset
;
674 /* Offset of the end of the PC-relative instruction containing
676 unsigned int plt0_got2_insn_end
;
678 /* Offsets into plt_entry that are to be replaced with... */
679 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
680 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
681 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
683 /* Length of the PC-relative instruction containing plt_got_offset. */
684 unsigned int plt_got_insn_size
;
686 /* Offset of the end of the PC-relative jump to plt0_entry. */
687 unsigned int plt_plt_insn_end
;
689 /* Offset into plt_entry where the initial value of the GOT entry points. */
690 unsigned int plt_lazy_offset
;
692 /* .eh_frame covering the .plt section. */
693 const bfd_byte
*eh_frame_plt
;
694 unsigned int eh_frame_plt_size
;
697 #define get_elf_x86_64_arch_data(bed) \
698 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
700 #define get_elf_x86_64_backend_data(abfd) \
701 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
703 #define GET_PLT_ENTRY_SIZE(abfd) \
704 get_elf_x86_64_backend_data (abfd)->plt_entry_size
706 /* These are the standard parameters. */
707 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed
=
709 elf_x86_64_plt0_entry
, /* plt0_entry */
710 elf_x86_64_plt_entry
, /* plt_entry */
711 sizeof (elf_x86_64_plt_entry
), /* plt_entry_size */
712 2, /* plt0_got1_offset */
713 8, /* plt0_got2_offset */
714 12, /* plt0_got2_insn_end */
715 2, /* plt_got_offset */
716 7, /* plt_reloc_offset */
717 12, /* plt_plt_offset */
718 6, /* plt_got_insn_size */
719 PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
720 6, /* plt_lazy_offset */
721 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
722 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
725 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed
=
727 elf_x86_64_bnd_plt0_entry
, /* plt0_entry */
728 elf_x86_64_bnd_plt_entry
, /* plt_entry */
729 sizeof (elf_x86_64_bnd_plt_entry
), /* plt_entry_size */
730 2, /* plt0_got1_offset */
731 1+8, /* plt0_got2_offset */
732 1+12, /* plt0_got2_insn_end */
733 1+2, /* plt_got_offset */
734 1, /* plt_reloc_offset */
735 7, /* plt_plt_offset */
736 1+6, /* plt_got_insn_size */
737 11, /* plt_plt_insn_end */
738 0, /* plt_lazy_offset */
739 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
740 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
743 #define elf_backend_arch_data &elf_x86_64_arch_bed
745 /* x86-64 ELF linker hash entry. */
747 struct elf_x86_64_link_hash_entry
749 struct elf_link_hash_entry elf
;
751 /* Track dynamic relocs copied for this symbol. */
752 struct elf_dyn_relocs
*dyn_relocs
;
754 #define GOT_UNKNOWN 0
758 #define GOT_TLS_GDESC 4
759 #define GOT_TLS_GD_BOTH_P(type) \
760 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
761 #define GOT_TLS_GD_P(type) \
762 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
763 #define GOT_TLS_GDESC_P(type) \
764 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
765 #define GOT_TLS_GD_ANY_P(type) \
766 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
767 unsigned char tls_type
;
769 /* TRUE if a weak symbol with a real definition needs a copy reloc.
770 When there is a weak symbol with a real definition, the processor
771 independent code will have arranged for us to see the real
772 definition first. We need to copy the needs_copy bit from the
773 real definition and check it when allowing copy reloc in PIE. */
774 unsigned int needs_copy
: 1;
776 /* TRUE if symbol has at least one BND relocation. */
777 unsigned int has_bnd_reloc
: 1;
779 /* Reference count of C/C++ function pointer relocations in read-write
780 section which can be resolved at run-time. */
781 bfd_signed_vma func_pointer_refcount
;
783 /* Information about the GOT PLT entry. Filled when there are both
784 GOT and PLT relocations against the same function. */
785 union gotplt_union plt_got
;
787 /* Information about the second PLT entry. Filled when has_bnd_reloc is
789 union gotplt_union plt_bnd
;
791 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
792 starting at the end of the jump table. */
796 #define elf_x86_64_hash_entry(ent) \
797 ((struct elf_x86_64_link_hash_entry *)(ent))
799 struct elf_x86_64_obj_tdata
801 struct elf_obj_tdata root
;
803 /* tls_type for each local got entry. */
804 char *local_got_tls_type
;
806 /* GOTPLT entries for TLS descriptors. */
807 bfd_vma
*local_tlsdesc_gotent
;
810 #define elf_x86_64_tdata(abfd) \
811 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
813 #define elf_x86_64_local_got_tls_type(abfd) \
814 (elf_x86_64_tdata (abfd)->local_got_tls_type)
816 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
817 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
819 #define is_x86_64_elf(bfd) \
820 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
821 && elf_tdata (bfd) != NULL \
822 && elf_object_id (bfd) == X86_64_ELF_DATA)
825 elf_x86_64_mkobject (bfd
*abfd
)
827 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
831 /* x86-64 ELF linker hash table. */
833 struct elf_x86_64_link_hash_table
835 struct elf_link_hash_table elf
;
837 /* Short-cuts to get to dynamic linker sections. */
840 asection
*plt_eh_frame
;
846 bfd_signed_vma refcount
;
850 /* The amount of space used by the jump slots in the GOT. */
851 bfd_vma sgotplt_jump_table_size
;
853 /* Small local sym cache. */
854 struct sym_cache sym_cache
;
856 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
857 bfd_vma (*r_sym
) (bfd_vma
);
858 unsigned int pointer_r_type
;
859 const char *dynamic_interpreter
;
860 int dynamic_interpreter_size
;
862 /* _TLS_MODULE_BASE_ symbol. */
863 struct bfd_link_hash_entry
*tls_module_base
;
865 /* Used by local STT_GNU_IFUNC symbols. */
866 htab_t loc_hash_table
;
867 void * loc_hash_memory
;
869 /* The offset into splt of the PLT entry for the TLS descriptor
870 resolver. Special values are 0, if not necessary (or not found
871 to be necessary yet), and -1 if needed but not determined
874 /* The offset into sgot of the GOT entry used by the PLT entry
878 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
879 bfd_vma next_jump_slot_index
;
880 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
881 bfd_vma next_irelative_index
;
884 /* Get the x86-64 ELF linker hash table from a link_info structure. */
886 #define elf_x86_64_hash_table(p) \
887 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
888 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
890 #define elf_x86_64_compute_jump_table_size(htab) \
891 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
893 /* Create an entry in an x86-64 ELF linker hash table. */
895 static struct bfd_hash_entry
*
896 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
897 struct bfd_hash_table
*table
,
900 /* Allocate the structure if it has not already been allocated by a
904 entry
= (struct bfd_hash_entry
*)
905 bfd_hash_allocate (table
,
906 sizeof (struct elf_x86_64_link_hash_entry
));
911 /* Call the allocation method of the superclass. */
912 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
915 struct elf_x86_64_link_hash_entry
*eh
;
917 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
918 eh
->dyn_relocs
= NULL
;
919 eh
->tls_type
= GOT_UNKNOWN
;
921 eh
->has_bnd_reloc
= 0;
922 eh
->func_pointer_refcount
= 0;
923 eh
->plt_bnd
.offset
= (bfd_vma
) -1;
924 eh
->plt_got
.offset
= (bfd_vma
) -1;
925 eh
->tlsdesc_got
= (bfd_vma
) -1;
931 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
932 for local symbol so that we can handle local STT_GNU_IFUNC symbols
933 as global symbol. We reuse indx and dynstr_index for local symbol
934 hash since they aren't used by global symbols in this backend. */
937 elf_x86_64_local_htab_hash (const void *ptr
)
939 struct elf_link_hash_entry
*h
940 = (struct elf_link_hash_entry
*) ptr
;
941 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
944 /* Compare local hash entries. */
947 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
949 struct elf_link_hash_entry
*h1
950 = (struct elf_link_hash_entry
*) ptr1
;
951 struct elf_link_hash_entry
*h2
952 = (struct elf_link_hash_entry
*) ptr2
;
954 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
957 /* Find and/or create a hash entry for local symbol. */
959 static struct elf_link_hash_entry
*
960 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
961 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
964 struct elf_x86_64_link_hash_entry e
, *ret
;
965 asection
*sec
= abfd
->sections
;
966 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
967 htab
->r_sym (rel
->r_info
));
970 e
.elf
.indx
= sec
->id
;
971 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
972 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
973 create
? INSERT
: NO_INSERT
);
980 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
984 ret
= (struct elf_x86_64_link_hash_entry
*)
985 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
986 sizeof (struct elf_x86_64_link_hash_entry
));
989 memset (ret
, 0, sizeof (*ret
));
990 ret
->elf
.indx
= sec
->id
;
991 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
992 ret
->elf
.dynindx
= -1;
993 ret
->func_pointer_refcount
= 0;
994 ret
->plt_got
.offset
= (bfd_vma
) -1;
1000 /* Destroy an X86-64 ELF linker hash table. */
1003 elf_x86_64_link_hash_table_free (bfd
*obfd
)
1005 struct elf_x86_64_link_hash_table
*htab
1006 = (struct elf_x86_64_link_hash_table
*) obfd
->link
.hash
;
1008 if (htab
->loc_hash_table
)
1009 htab_delete (htab
->loc_hash_table
);
1010 if (htab
->loc_hash_memory
)
1011 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
1012 _bfd_elf_link_hash_table_free (obfd
);
1015 /* Create an X86-64 ELF linker hash table. */
1017 static struct bfd_link_hash_table
*
1018 elf_x86_64_link_hash_table_create (bfd
*abfd
)
1020 struct elf_x86_64_link_hash_table
*ret
;
1021 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
1023 ret
= (struct elf_x86_64_link_hash_table
*) bfd_zmalloc (amt
);
1027 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1028 elf_x86_64_link_hash_newfunc
,
1029 sizeof (struct elf_x86_64_link_hash_entry
),
1036 if (ABI_64_P (abfd
))
1038 ret
->r_info
= elf64_r_info
;
1039 ret
->r_sym
= elf64_r_sym
;
1040 ret
->pointer_r_type
= R_X86_64_64
;
1041 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
1042 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
1046 ret
->r_info
= elf32_r_info
;
1047 ret
->r_sym
= elf32_r_sym
;
1048 ret
->pointer_r_type
= R_X86_64_32
;
1049 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
1050 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
1053 ret
->loc_hash_table
= htab_try_create (1024,
1054 elf_x86_64_local_htab_hash
,
1055 elf_x86_64_local_htab_eq
,
1057 ret
->loc_hash_memory
= objalloc_create ();
1058 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1060 elf_x86_64_link_hash_table_free (abfd
);
1063 ret
->elf
.root
.hash_table_free
= elf_x86_64_link_hash_table_free
;
1065 return &ret
->elf
.root
;
1068 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1069 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1073 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
1074 struct bfd_link_info
*info
)
1076 struct elf_x86_64_link_hash_table
*htab
;
1078 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1081 htab
= elf_x86_64_hash_table (info
);
1085 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
1089 if (bfd_link_executable (info
))
1091 /* Always allow copy relocs for building executables. */
1092 asection
*s
= bfd_get_linker_section (dynobj
, ".rela.bss");
1095 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
1096 s
= bfd_make_section_anyway_with_flags (dynobj
,
1098 (bed
->dynamic_sec_flags
1101 || ! bfd_set_section_alignment (dynobj
, s
,
1102 bed
->s
->log_file_align
))
1108 if (!info
->no_ld_generated_unwind_info
1109 && htab
->plt_eh_frame
== NULL
1110 && htab
->elf
.splt
!= NULL
)
1112 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1113 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1114 | SEC_LINKER_CREATED
);
1116 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1117 if (htab
->plt_eh_frame
== NULL
1118 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
1124 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1127 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1128 struct elf_link_hash_entry
*dir
,
1129 struct elf_link_hash_entry
*ind
)
1131 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1133 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1134 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1136 if (!edir
->has_bnd_reloc
)
1137 edir
->has_bnd_reloc
= eind
->has_bnd_reloc
;
1139 if (eind
->dyn_relocs
!= NULL
)
1141 if (edir
->dyn_relocs
!= NULL
)
1143 struct elf_dyn_relocs
**pp
;
1144 struct elf_dyn_relocs
*p
;
1146 /* Add reloc counts against the indirect sym to the direct sym
1147 list. Merge any entries against the same section. */
1148 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1150 struct elf_dyn_relocs
*q
;
1152 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1153 if (q
->sec
== p
->sec
)
1155 q
->pc_count
+= p
->pc_count
;
1156 q
->count
+= p
->count
;
1163 *pp
= edir
->dyn_relocs
;
1166 edir
->dyn_relocs
= eind
->dyn_relocs
;
1167 eind
->dyn_relocs
= NULL
;
1170 if (ind
->root
.type
== bfd_link_hash_indirect
1171 && dir
->got
.refcount
<= 0)
1173 edir
->tls_type
= eind
->tls_type
;
1174 eind
->tls_type
= GOT_UNKNOWN
;
1177 if (ELIMINATE_COPY_RELOCS
1178 && ind
->root
.type
!= bfd_link_hash_indirect
1179 && dir
->dynamic_adjusted
)
1181 /* If called to transfer flags for a weakdef during processing
1182 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1183 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1184 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1185 dir
->ref_regular
|= ind
->ref_regular
;
1186 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1187 dir
->needs_plt
|= ind
->needs_plt
;
1188 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1192 if (eind
->func_pointer_refcount
> 0)
1194 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1195 eind
->func_pointer_refcount
= 0;
1198 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1203 elf64_x86_64_elf_object_p (bfd
*abfd
)
1205 /* Set the right machine number for an x86-64 elf64 file. */
1206 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1211 elf32_x86_64_elf_object_p (bfd
*abfd
)
1213 /* Set the right machine number for an x86-64 elf32 file. */
1214 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1218 /* Return TRUE if the TLS access code sequence support transition
1222 elf_x86_64_check_tls_transition (bfd
*abfd
,
1223 struct bfd_link_info
*info
,
1226 Elf_Internal_Shdr
*symtab_hdr
,
1227 struct elf_link_hash_entry
**sym_hashes
,
1228 unsigned int r_type
,
1229 const Elf_Internal_Rela
*rel
,
1230 const Elf_Internal_Rela
*relend
)
1233 unsigned long r_symndx
;
1234 bfd_boolean largepic
= FALSE
;
1235 struct elf_link_hash_entry
*h
;
1237 struct elf_x86_64_link_hash_table
*htab
;
1239 /* Get the section contents. */
1240 if (contents
== NULL
)
1242 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1243 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1246 /* FIXME: How to better handle error condition? */
1247 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1250 /* Cache the section contents for elf_link_input_bfd. */
1251 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1255 htab
= elf_x86_64_hash_table (info
);
1256 offset
= rel
->r_offset
;
1259 case R_X86_64_TLSGD
:
1260 case R_X86_64_TLSLD
:
1261 if ((rel
+ 1) >= relend
)
1264 if (r_type
== R_X86_64_TLSGD
)
1266 /* Check transition from GD access model. For 64bit, only
1267 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1268 .word 0x6666; rex64; call __tls_get_addr
1269 can transit to different access model. For 32bit, only
1270 leaq foo@tlsgd(%rip), %rdi
1271 .word 0x6666; rex64; call __tls_get_addr
1272 can transit to different access model. For largepic
1274 leaq foo@tlsgd(%rip), %rdi
1275 movabsq $__tls_get_addr@pltoff, %rax
1279 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1280 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1282 if ((offset
+ 12) > sec
->size
)
1285 if (memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1287 if (!ABI_64_P (abfd
)
1288 || (offset
+ 19) > sec
->size
1290 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0
1291 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1292 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1297 else if (ABI_64_P (abfd
))
1300 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1306 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1312 /* Check transition from LD access model. Only
1313 leaq foo@tlsld(%rip), %rdi;
1315 can transit to different access model. For largepic
1317 leaq foo@tlsld(%rip), %rdi
1318 movabsq $__tls_get_addr@pltoff, %rax
1322 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1324 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1327 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1330 if (0xe8 != *(contents
+ offset
+ 4))
1332 if (!ABI_64_P (abfd
)
1333 || (offset
+ 19) > sec
->size
1334 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1335 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1342 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1343 if (r_symndx
< symtab_hdr
->sh_info
)
1346 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1347 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1348 may be versioned. */
1350 && h
->root
.root
.string
!= NULL
1352 ? ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
1353 : (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1354 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
))
1355 && (strncmp (h
->root
.root
.string
,
1356 "__tls_get_addr", 14) == 0));
1358 case R_X86_64_GOTTPOFF
:
1359 /* Check transition from IE access model:
1360 mov foo@gottpoff(%rip), %reg
1361 add foo@gottpoff(%rip), %reg
1364 /* Check REX prefix first. */
1365 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1367 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1368 if (val
!= 0x48 && val
!= 0x4c)
1370 /* X32 may have 0x44 REX prefix or no REX prefix. */
1371 if (ABI_64_P (abfd
))
1377 /* X32 may not have any REX prefix. */
1378 if (ABI_64_P (abfd
))
1380 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1384 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1385 if (val
!= 0x8b && val
!= 0x03)
1388 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1389 return (val
& 0xc7) == 5;
1391 case R_X86_64_GOTPC32_TLSDESC
:
1392 /* Check transition from GDesc access model:
1393 leaq x@tlsdesc(%rip), %rax
1395 Make sure it's a leaq adding rip to a 32-bit offset
1396 into any register, although it's probably almost always
1399 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1402 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1403 if ((val
& 0xfb) != 0x48)
1406 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1409 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1410 return (val
& 0xc7) == 0x05;
1412 case R_X86_64_TLSDESC_CALL
:
1413 /* Check transition from GDesc access model:
1414 call *x@tlsdesc(%rax)
1416 if (offset
+ 2 <= sec
->size
)
1418 /* Make sure that it's a call *x@tlsdesc(%rax). */
1419 static const unsigned char call
[] = { 0xff, 0x10 };
1420 return memcmp (contents
+ offset
, call
, 2) == 0;
1430 /* Return TRUE if the TLS access transition is OK or no transition
1431 will be performed. Update R_TYPE if there is a transition. */
1434 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1435 asection
*sec
, bfd_byte
*contents
,
1436 Elf_Internal_Shdr
*symtab_hdr
,
1437 struct elf_link_hash_entry
**sym_hashes
,
1438 unsigned int *r_type
, int tls_type
,
1439 const Elf_Internal_Rela
*rel
,
1440 const Elf_Internal_Rela
*relend
,
1441 struct elf_link_hash_entry
*h
,
1442 unsigned long r_symndx
)
1444 unsigned int from_type
= *r_type
;
1445 unsigned int to_type
= from_type
;
1446 bfd_boolean check
= TRUE
;
1448 /* Skip TLS transition for functions. */
1450 && (h
->type
== STT_FUNC
1451 || h
->type
== STT_GNU_IFUNC
))
1456 case R_X86_64_TLSGD
:
1457 case R_X86_64_GOTPC32_TLSDESC
:
1458 case R_X86_64_TLSDESC_CALL
:
1459 case R_X86_64_GOTTPOFF
:
1460 if (bfd_link_executable (info
))
1463 to_type
= R_X86_64_TPOFF32
;
1465 to_type
= R_X86_64_GOTTPOFF
;
1468 /* When we are called from elf_x86_64_relocate_section,
1469 CONTENTS isn't NULL and there may be additional transitions
1470 based on TLS_TYPE. */
1471 if (contents
!= NULL
)
1473 unsigned int new_to_type
= to_type
;
1475 if (bfd_link_executable (info
)
1478 && tls_type
== GOT_TLS_IE
)
1479 new_to_type
= R_X86_64_TPOFF32
;
1481 if (to_type
== R_X86_64_TLSGD
1482 || to_type
== R_X86_64_GOTPC32_TLSDESC
1483 || to_type
== R_X86_64_TLSDESC_CALL
)
1485 if (tls_type
== GOT_TLS_IE
)
1486 new_to_type
= R_X86_64_GOTTPOFF
;
1489 /* We checked the transition before when we were called from
1490 elf_x86_64_check_relocs. We only want to check the new
1491 transition which hasn't been checked before. */
1492 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1493 to_type
= new_to_type
;
1498 case R_X86_64_TLSLD
:
1499 if (bfd_link_executable (info
))
1500 to_type
= R_X86_64_TPOFF32
;
1507 /* Return TRUE if there is no transition. */
1508 if (from_type
== to_type
)
1511 /* Check if the transition can be performed. */
1513 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1514 symtab_hdr
, sym_hashes
,
1515 from_type
, rel
, relend
))
1517 reloc_howto_type
*from
, *to
;
1520 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1521 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1524 name
= h
->root
.root
.string
;
1527 struct elf_x86_64_link_hash_table
*htab
;
1529 htab
= elf_x86_64_hash_table (info
);
1534 Elf_Internal_Sym
*isym
;
1536 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1538 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1542 (*_bfd_error_handler
)
1543 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1544 "in section `%A' failed"),
1545 abfd
, sec
, from
->name
, to
->name
, name
,
1546 (unsigned long) rel
->r_offset
);
1547 bfd_set_error (bfd_error_bad_value
);
1555 /* Rename some of the generic section flags to better document how they
1557 #define need_convert_load sec_flg0
1559 /* Look through the relocs for a section during the first phase, and
1560 calculate needed space in the global offset table, procedure
1561 linkage table, and dynamic reloc sections. */
1564 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1566 const Elf_Internal_Rela
*relocs
)
1568 struct elf_x86_64_link_hash_table
*htab
;
1569 Elf_Internal_Shdr
*symtab_hdr
;
1570 struct elf_link_hash_entry
**sym_hashes
;
1571 const Elf_Internal_Rela
*rel
;
1572 const Elf_Internal_Rela
*rel_end
;
1574 bfd_boolean use_plt_got
;
1576 if (bfd_link_relocatable (info
))
1579 BFD_ASSERT (is_x86_64_elf (abfd
));
1581 htab
= elf_x86_64_hash_table (info
);
1585 use_plt_got
= get_elf_x86_64_backend_data (abfd
) == &elf_x86_64_arch_bed
;
1587 symtab_hdr
= &elf_symtab_hdr (abfd
);
1588 sym_hashes
= elf_sym_hashes (abfd
);
1592 rel_end
= relocs
+ sec
->reloc_count
;
1593 for (rel
= relocs
; rel
< rel_end
; rel
++)
1595 unsigned int r_type
;
1596 unsigned long r_symndx
;
1597 struct elf_link_hash_entry
*h
;
1598 Elf_Internal_Sym
*isym
;
1600 bfd_boolean size_reloc
;
1602 r_symndx
= htab
->r_sym (rel
->r_info
);
1603 r_type
= ELF32_R_TYPE (rel
->r_info
);
1605 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1607 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1612 if (r_symndx
< symtab_hdr
->sh_info
)
1614 /* A local symbol. */
1615 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1620 /* Check relocation against local STT_GNU_IFUNC symbol. */
1621 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1623 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1628 /* Fake a STT_GNU_IFUNC symbol. */
1629 h
->type
= STT_GNU_IFUNC
;
1632 h
->forced_local
= 1;
1633 h
->root
.type
= bfd_link_hash_defined
;
1641 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1642 while (h
->root
.type
== bfd_link_hash_indirect
1643 || h
->root
.type
== bfd_link_hash_warning
)
1644 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1647 /* Check invalid x32 relocations. */
1648 if (!ABI_64_P (abfd
))
1654 case R_X86_64_DTPOFF64
:
1655 case R_X86_64_TPOFF64
:
1657 case R_X86_64_GOTOFF64
:
1658 case R_X86_64_GOT64
:
1659 case R_X86_64_GOTPCREL64
:
1660 case R_X86_64_GOTPC64
:
1661 case R_X86_64_GOTPLT64
:
1662 case R_X86_64_PLTOFF64
:
1665 name
= h
->root
.root
.string
;
1667 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1669 (*_bfd_error_handler
)
1670 (_("%B: relocation %s against symbol `%s' isn't "
1671 "supported in x32 mode"), abfd
,
1672 x86_64_elf_howto_table
[r_type
].name
, name
);
1673 bfd_set_error (bfd_error_bad_value
);
1681 /* Create the ifunc sections for static executables. If we
1682 never see an indirect function symbol nor we are building
1683 a static executable, those sections will be empty and
1684 won't appear in output. */
1690 case R_X86_64_PC32_BND
:
1691 case R_X86_64_PLT32_BND
:
1693 case R_X86_64_PLT32
:
1696 /* MPX PLT is supported only if elf_x86_64_arch_bed
1697 is used in 64-bit mode. */
1700 && (get_elf_x86_64_backend_data (abfd
)
1701 == &elf_x86_64_arch_bed
))
1703 elf_x86_64_hash_entry (h
)->has_bnd_reloc
= 1;
1705 /* Create the second PLT for Intel MPX support. */
1706 if (htab
->plt_bnd
== NULL
)
1708 unsigned int plt_bnd_align
;
1709 const struct elf_backend_data
*bed
;
1711 bed
= get_elf_backend_data (info
->output_bfd
);
1712 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
) == 8
1713 && (sizeof (elf_x86_64_bnd_plt2_entry
)
1714 == sizeof (elf_x86_64_legacy_plt2_entry
)));
1717 if (htab
->elf
.dynobj
== NULL
)
1718 htab
->elf
.dynobj
= abfd
;
1720 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1722 (bed
->dynamic_sec_flags
1727 if (htab
->plt_bnd
== NULL
1728 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
1737 case R_X86_64_GOTPCREL
:
1738 case R_X86_64_GOTPCRELX
:
1739 case R_X86_64_REX_GOTPCRELX
:
1740 case R_X86_64_GOTPCREL64
:
1741 if (htab
->elf
.dynobj
== NULL
)
1742 htab
->elf
.dynobj
= abfd
;
1743 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1748 /* It is referenced by a non-shared object. */
1750 h
->root
.non_ir_ref
= 1;
1752 if (h
->type
== STT_GNU_IFUNC
)
1753 elf_tdata (info
->output_bfd
)->has_gnu_symbols
1754 |= elf_gnu_symbol_ifunc
;
1757 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1758 symtab_hdr
, sym_hashes
,
1759 &r_type
, GOT_UNKNOWN
,
1760 rel
, rel_end
, h
, r_symndx
))
1765 case R_X86_64_TLSLD
:
1766 htab
->tls_ld_got
.refcount
+= 1;
1769 case R_X86_64_TPOFF32
:
1770 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
1773 name
= h
->root
.root
.string
;
1775 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1777 (*_bfd_error_handler
)
1778 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1780 x86_64_elf_howto_table
[r_type
].name
, name
);
1781 bfd_set_error (bfd_error_bad_value
);
1786 case R_X86_64_GOTTPOFF
:
1787 if (!bfd_link_executable (info
))
1788 info
->flags
|= DF_STATIC_TLS
;
1791 case R_X86_64_GOT32
:
1792 case R_X86_64_GOTPCREL
:
1793 case R_X86_64_GOTPCRELX
:
1794 case R_X86_64_REX_GOTPCRELX
:
1795 case R_X86_64_TLSGD
:
1796 case R_X86_64_GOT64
:
1797 case R_X86_64_GOTPCREL64
:
1798 case R_X86_64_GOTPLT64
:
1799 case R_X86_64_GOTPC32_TLSDESC
:
1800 case R_X86_64_TLSDESC_CALL
:
1801 /* This symbol requires a global offset table entry. */
1803 int tls_type
, old_tls_type
;
1807 default: tls_type
= GOT_NORMAL
; break;
1808 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1809 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1810 case R_X86_64_GOTPC32_TLSDESC
:
1811 case R_X86_64_TLSDESC_CALL
:
1812 tls_type
= GOT_TLS_GDESC
; break;
1817 h
->got
.refcount
+= 1;
1818 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1822 bfd_signed_vma
*local_got_refcounts
;
1824 /* This is a global offset table entry for a local symbol. */
1825 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1826 if (local_got_refcounts
== NULL
)
1830 size
= symtab_hdr
->sh_info
;
1831 size
*= sizeof (bfd_signed_vma
)
1832 + sizeof (bfd_vma
) + sizeof (char);
1833 local_got_refcounts
= ((bfd_signed_vma
*)
1834 bfd_zalloc (abfd
, size
));
1835 if (local_got_refcounts
== NULL
)
1837 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1838 elf_x86_64_local_tlsdesc_gotent (abfd
)
1839 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1840 elf_x86_64_local_got_tls_type (abfd
)
1841 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1843 local_got_refcounts
[r_symndx
] += 1;
1845 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1848 /* If a TLS symbol is accessed using IE at least once,
1849 there is no point to use dynamic model for it. */
1850 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1851 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1852 || tls_type
!= GOT_TLS_IE
))
1854 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1855 tls_type
= old_tls_type
;
1856 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1857 && GOT_TLS_GD_ANY_P (tls_type
))
1858 tls_type
|= old_tls_type
;
1862 name
= h
->root
.root
.string
;
1864 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1866 (*_bfd_error_handler
)
1867 (_("%B: '%s' accessed both as normal and thread local symbol"),
1869 bfd_set_error (bfd_error_bad_value
);
1874 if (old_tls_type
!= tls_type
)
1877 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1879 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1884 case R_X86_64_GOTOFF64
:
1885 case R_X86_64_GOTPC32
:
1886 case R_X86_64_GOTPC64
:
1888 if (htab
->elf
.sgot
== NULL
)
1890 if (htab
->elf
.dynobj
== NULL
)
1891 htab
->elf
.dynobj
= abfd
;
1892 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1898 case R_X86_64_PLT32
:
1899 case R_X86_64_PLT32_BND
:
1900 /* This symbol requires a procedure linkage table entry. We
1901 actually build the entry in adjust_dynamic_symbol,
1902 because this might be a case of linking PIC code which is
1903 never referenced by a dynamic object, in which case we
1904 don't need to generate a procedure linkage table entry
1907 /* If this is a local symbol, we resolve it directly without
1908 creating a procedure linkage table entry. */
1913 h
->plt
.refcount
+= 1;
1916 case R_X86_64_PLTOFF64
:
1917 /* This tries to form the 'address' of a function relative
1918 to GOT. For global symbols we need a PLT entry. */
1922 h
->plt
.refcount
+= 1;
1926 case R_X86_64_SIZE32
:
1927 case R_X86_64_SIZE64
:
1932 if (!ABI_64_P (abfd
))
1937 /* Let's help debug shared library creation. These relocs
1938 cannot be used in shared libs. Don't error out for
1939 sections we don't care about, such as debug sections or
1940 non-constant sections. */
1941 if (bfd_link_pic (info
)
1942 && (sec
->flags
& SEC_ALLOC
) != 0
1943 && (sec
->flags
& SEC_READONLY
) != 0)
1946 name
= h
->root
.root
.string
;
1948 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1949 (*_bfd_error_handler
)
1950 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1951 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1952 bfd_set_error (bfd_error_bad_value
);
1960 case R_X86_64_PC32_BND
:
1964 if (h
!= NULL
&& bfd_link_executable (info
))
1966 /* If this reloc is in a read-only section, we might
1967 need a copy reloc. We can't check reliably at this
1968 stage whether the section is read-only, as input
1969 sections have not yet been mapped to output sections.
1970 Tentatively set the flag for now, and correct in
1971 adjust_dynamic_symbol. */
1974 /* We may need a .plt entry if the function this reloc
1975 refers to is in a shared lib. */
1976 h
->plt
.refcount
+= 1;
1977 if (r_type
== R_X86_64_PC32
)
1979 /* Since something like ".long foo - ." may be used
1980 as pointer, make sure that PLT is used if foo is
1981 a function defined in a shared library. */
1982 if ((sec
->flags
& SEC_CODE
) == 0)
1983 h
->pointer_equality_needed
= 1;
1985 else if (r_type
!= R_X86_64_PC32_BND
1986 && r_type
!= R_X86_64_PC64
)
1988 h
->pointer_equality_needed
= 1;
1989 /* At run-time, R_X86_64_64 can be resolved for both
1990 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
1991 can only be resolved for x32. */
1992 if ((sec
->flags
& SEC_READONLY
) == 0
1993 && (r_type
== R_X86_64_64
1994 || (!ABI_64_P (abfd
)
1995 && (r_type
== R_X86_64_32
1996 || r_type
== R_X86_64_32S
))))
1998 struct elf_x86_64_link_hash_entry
*eh
1999 = (struct elf_x86_64_link_hash_entry
*) h
;
2000 eh
->func_pointer_refcount
+= 1;
2007 /* If we are creating a shared library, and this is a reloc
2008 against a global symbol, or a non PC relative reloc
2009 against a local symbol, then we need to copy the reloc
2010 into the shared library. However, if we are linking with
2011 -Bsymbolic, we do not need to copy a reloc against a
2012 global symbol which is defined in an object we are
2013 including in the link (i.e., DEF_REGULAR is set). At
2014 this point we have not seen all the input files, so it is
2015 possible that DEF_REGULAR is not set now but will be set
2016 later (it is never cleared). In case of a weak definition,
2017 DEF_REGULAR may be cleared later by a strong definition in
2018 a shared library. We account for that possibility below by
2019 storing information in the relocs_copied field of the hash
2020 table entry. A similar situation occurs when creating
2021 shared libraries and symbol visibility changes render the
2024 If on the other hand, we are creating an executable, we
2025 may need to keep relocations for symbols satisfied by a
2026 dynamic library if we manage to avoid copy relocs for the
2028 if ((bfd_link_pic (info
)
2029 && (sec
->flags
& SEC_ALLOC
) != 0
2030 && (! IS_X86_64_PCREL_TYPE (r_type
)
2032 && (! SYMBOLIC_BIND (info
, h
)
2033 || h
->root
.type
== bfd_link_hash_defweak
2034 || !h
->def_regular
))))
2035 || (ELIMINATE_COPY_RELOCS
2036 && !bfd_link_pic (info
)
2037 && (sec
->flags
& SEC_ALLOC
) != 0
2039 && (h
->root
.type
== bfd_link_hash_defweak
2040 || !h
->def_regular
)))
2042 struct elf_dyn_relocs
*p
;
2043 struct elf_dyn_relocs
**head
;
2045 /* We must copy these reloc types into the output file.
2046 Create a reloc section in dynobj and make room for
2050 if (htab
->elf
.dynobj
== NULL
)
2051 htab
->elf
.dynobj
= abfd
;
2053 sreloc
= _bfd_elf_make_dynamic_reloc_section
2054 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
2055 abfd
, /*rela?*/ TRUE
);
2061 /* If this is a global symbol, we count the number of
2062 relocations we need for this symbol. */
2065 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
2069 /* Track dynamic relocs needed for local syms too.
2070 We really need local syms available to do this
2075 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2080 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2084 /* Beware of type punned pointers vs strict aliasing
2086 vpp
= &(elf_section_data (s
)->local_dynrel
);
2087 head
= (struct elf_dyn_relocs
**)vpp
;
2091 if (p
== NULL
|| p
->sec
!= sec
)
2093 bfd_size_type amt
= sizeof *p
;
2095 p
= ((struct elf_dyn_relocs
*)
2096 bfd_alloc (htab
->elf
.dynobj
, amt
));
2107 /* Count size relocation as PC-relative relocation. */
2108 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2113 /* This relocation describes the C++ object vtable hierarchy.
2114 Reconstruct it for later use during GC. */
2115 case R_X86_64_GNU_VTINHERIT
:
2116 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2120 /* This relocation describes which C++ vtable entries are actually
2121 used. Record for later use during GC. */
2122 case R_X86_64_GNU_VTENTRY
:
2123 BFD_ASSERT (h
!= NULL
);
2125 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2135 && h
->plt
.refcount
> 0
2136 && (((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2137 || h
->got
.refcount
> 0)
2138 && htab
->plt_got
== NULL
)
2140 /* Create the GOT procedure linkage table. */
2141 unsigned int plt_got_align
;
2142 const struct elf_backend_data
*bed
;
2144 bed
= get_elf_backend_data (info
->output_bfd
);
2145 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry
) == 8
2146 && (sizeof (elf_x86_64_bnd_plt2_entry
)
2147 == sizeof (elf_x86_64_legacy_plt2_entry
)));
2150 if (htab
->elf
.dynobj
== NULL
)
2151 htab
->elf
.dynobj
= abfd
;
2153 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2155 (bed
->dynamic_sec_flags
2160 if (htab
->plt_got
== NULL
2161 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2167 if ((r_type
== R_X86_64_GOTPCREL
2168 || r_type
== R_X86_64_GOTPCRELX
2169 || r_type
== R_X86_64_REX_GOTPCRELX
)
2170 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2171 sec
->need_convert_load
= 1;
2177 /* Return the section that should be marked against GC for a given
2181 elf_x86_64_gc_mark_hook (asection
*sec
,
2182 struct bfd_link_info
*info
,
2183 Elf_Internal_Rela
*rel
,
2184 struct elf_link_hash_entry
*h
,
2185 Elf_Internal_Sym
*sym
)
2188 switch (ELF32_R_TYPE (rel
->r_info
))
2190 case R_X86_64_GNU_VTINHERIT
:
2191 case R_X86_64_GNU_VTENTRY
:
2195 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2198 /* Update the got entry reference counts for the section being removed. */
2201 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
2203 const Elf_Internal_Rela
*relocs
)
2205 struct elf_x86_64_link_hash_table
*htab
;
2206 Elf_Internal_Shdr
*symtab_hdr
;
2207 struct elf_link_hash_entry
**sym_hashes
;
2208 bfd_signed_vma
*local_got_refcounts
;
2209 const Elf_Internal_Rela
*rel
, *relend
;
2211 if (bfd_link_relocatable (info
))
2214 htab
= elf_x86_64_hash_table (info
);
2218 elf_section_data (sec
)->local_dynrel
= NULL
;
2220 symtab_hdr
= &elf_symtab_hdr (abfd
);
2221 sym_hashes
= elf_sym_hashes (abfd
);
2222 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2224 htab
= elf_x86_64_hash_table (info
);
2225 relend
= relocs
+ sec
->reloc_count
;
2226 for (rel
= relocs
; rel
< relend
; rel
++)
2228 unsigned long r_symndx
;
2229 unsigned int r_type
;
2230 struct elf_link_hash_entry
*h
= NULL
;
2231 bfd_boolean pointer_reloc
;
2233 r_symndx
= htab
->r_sym (rel
->r_info
);
2234 if (r_symndx
>= symtab_hdr
->sh_info
)
2236 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2237 while (h
->root
.type
== bfd_link_hash_indirect
2238 || h
->root
.type
== bfd_link_hash_warning
)
2239 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2243 /* A local symbol. */
2244 Elf_Internal_Sym
*isym
;
2246 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2249 /* Check relocation against local STT_GNU_IFUNC symbol. */
2251 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2253 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2261 struct elf_x86_64_link_hash_entry
*eh
;
2262 struct elf_dyn_relocs
**pp
;
2263 struct elf_dyn_relocs
*p
;
2265 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2267 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2270 /* Everything must go for SEC. */
2276 r_type
= ELF32_R_TYPE (rel
->r_info
);
2277 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2278 symtab_hdr
, sym_hashes
,
2279 &r_type
, GOT_UNKNOWN
,
2280 rel
, relend
, h
, r_symndx
))
2283 pointer_reloc
= FALSE
;
2286 case R_X86_64_TLSLD
:
2287 if (htab
->tls_ld_got
.refcount
> 0)
2288 htab
->tls_ld_got
.refcount
-= 1;
2291 case R_X86_64_TLSGD
:
2292 case R_X86_64_GOTPC32_TLSDESC
:
2293 case R_X86_64_TLSDESC_CALL
:
2294 case R_X86_64_GOTTPOFF
:
2295 case R_X86_64_GOT32
:
2296 case R_X86_64_GOTPCREL
:
2297 case R_X86_64_GOTPCRELX
:
2298 case R_X86_64_REX_GOTPCRELX
:
2299 case R_X86_64_GOT64
:
2300 case R_X86_64_GOTPCREL64
:
2301 case R_X86_64_GOTPLT64
:
2304 if (h
->got
.refcount
> 0)
2305 h
->got
.refcount
-= 1;
2306 if (h
->type
== STT_GNU_IFUNC
)
2308 if (h
->plt
.refcount
> 0)
2309 h
->plt
.refcount
-= 1;
2312 else if (local_got_refcounts
!= NULL
)
2314 if (local_got_refcounts
[r_symndx
] > 0)
2315 local_got_refcounts
[r_symndx
] -= 1;
2321 pointer_reloc
= !ABI_64_P (abfd
);
2325 pointer_reloc
= TRUE
;
2331 case R_X86_64_PC32_BND
:
2333 case R_X86_64_SIZE32
:
2334 case R_X86_64_SIZE64
:
2336 if (bfd_link_pic (info
)
2337 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2341 case R_X86_64_PLT32
:
2342 case R_X86_64_PLT32_BND
:
2343 case R_X86_64_PLTOFF64
:
2346 if (h
->plt
.refcount
> 0)
2347 h
->plt
.refcount
-= 1;
2348 if (pointer_reloc
&& (sec
->flags
& SEC_READONLY
) == 0)
2350 struct elf_x86_64_link_hash_entry
*eh
2351 = (struct elf_x86_64_link_hash_entry
*) h
;
2352 if (eh
->func_pointer_refcount
> 0)
2353 eh
->func_pointer_refcount
-= 1;
2366 /* Adjust a symbol defined by a dynamic object and referenced by a
2367 regular object. The current definition is in some section of the
2368 dynamic object, but we're not including those sections. We have to
2369 change the definition to something the rest of the link can
2373 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2374 struct elf_link_hash_entry
*h
)
2376 struct elf_x86_64_link_hash_table
*htab
;
2378 struct elf_x86_64_link_hash_entry
*eh
;
2379 struct elf_dyn_relocs
*p
;
2381 /* STT_GNU_IFUNC symbol must go through PLT. */
2382 if (h
->type
== STT_GNU_IFUNC
)
2384 /* All local STT_GNU_IFUNC references must be treate as local
2385 calls via local PLT. */
2387 && SYMBOL_CALLS_LOCAL (info
, h
))
2389 bfd_size_type pc_count
= 0, count
= 0;
2390 struct elf_dyn_relocs
**pp
;
2392 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2393 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2395 pc_count
+= p
->pc_count
;
2396 p
->count
-= p
->pc_count
;
2405 if (pc_count
|| count
)
2409 if (h
->plt
.refcount
<= 0)
2410 h
->plt
.refcount
= 1;
2412 h
->plt
.refcount
+= 1;
2416 if (h
->plt
.refcount
<= 0)
2418 h
->plt
.offset
= (bfd_vma
) -1;
2424 /* If this is a function, put it in the procedure linkage table. We
2425 will fill in the contents of the procedure linkage table later,
2426 when we know the address of the .got section. */
2427 if (h
->type
== STT_FUNC
2430 if (h
->plt
.refcount
<= 0
2431 || SYMBOL_CALLS_LOCAL (info
, h
)
2432 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2433 && h
->root
.type
== bfd_link_hash_undefweak
))
2435 /* This case can occur if we saw a PLT32 reloc in an input
2436 file, but the symbol was never referred to by a dynamic
2437 object, or if all references were garbage collected. In
2438 such a case, we don't actually need to build a procedure
2439 linkage table, and we can just do a PC32 reloc instead. */
2440 h
->plt
.offset
= (bfd_vma
) -1;
2447 /* It's possible that we incorrectly decided a .plt reloc was
2448 needed for an R_X86_64_PC32 reloc to a non-function sym in
2449 check_relocs. We can't decide accurately between function and
2450 non-function syms in check-relocs; Objects loaded later in
2451 the link may change h->type. So fix it now. */
2452 h
->plt
.offset
= (bfd_vma
) -1;
2454 /* If this is a weak symbol, and there is a real definition, the
2455 processor independent code will have arranged for us to see the
2456 real definition first, and we can just use the same value. */
2457 if (h
->u
.weakdef
!= NULL
)
2459 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2460 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2461 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2462 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2463 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2465 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2466 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2467 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
2472 /* This is a reference to a symbol defined by a dynamic object which
2473 is not a function. */
2475 /* If we are creating a shared library, we must presume that the
2476 only references to the symbol are via the global offset table.
2477 For such cases we need not do anything here; the relocations will
2478 be handled correctly by relocate_section. */
2479 if (!bfd_link_executable (info
))
2482 /* If there are no references to this symbol that do not use the
2483 GOT, we don't need to generate a copy reloc. */
2484 if (!h
->non_got_ref
)
2487 /* If -z nocopyreloc was given, we won't generate them either. */
2488 if (info
->nocopyreloc
)
2494 if (ELIMINATE_COPY_RELOCS
)
2496 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2497 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2499 s
= p
->sec
->output_section
;
2500 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2504 /* If we didn't find any dynamic relocs in read-only sections, then
2505 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2513 /* We must allocate the symbol in our .dynbss section, which will
2514 become part of the .bss section of the executable. There will be
2515 an entry for this symbol in the .dynsym section. The dynamic
2516 object will contain position independent code, so all references
2517 from the dynamic object to this symbol will go through the global
2518 offset table. The dynamic linker will use the .dynsym entry to
2519 determine the address it must put in the global offset table, so
2520 both the dynamic object and the regular object will refer to the
2521 same memory location for the variable. */
2523 htab
= elf_x86_64_hash_table (info
);
2527 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2528 to copy the initial value out of the dynamic object and into the
2529 runtime process image. */
2530 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2532 const struct elf_backend_data
*bed
;
2533 bed
= get_elf_backend_data (info
->output_bfd
);
2534 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2540 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
2543 /* Allocate space in .plt, .got and associated reloc sections for
2547 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2549 struct bfd_link_info
*info
;
2550 struct elf_x86_64_link_hash_table
*htab
;
2551 struct elf_x86_64_link_hash_entry
*eh
;
2552 struct elf_dyn_relocs
*p
;
2553 const struct elf_backend_data
*bed
;
2554 unsigned int plt_entry_size
;
2556 if (h
->root
.type
== bfd_link_hash_indirect
)
2559 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2561 info
= (struct bfd_link_info
*) inf
;
2562 htab
= elf_x86_64_hash_table (info
);
2565 bed
= get_elf_backend_data (info
->output_bfd
);
2566 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2568 /* We can't use the GOT PLT if pointer equality is needed since
2569 finish_dynamic_symbol won't clear symbol value and the dynamic
2570 linker won't update the GOT slot. We will get into an infinite
2571 loop at run-time. */
2572 if (htab
->plt_got
!= NULL
2573 && h
->type
!= STT_GNU_IFUNC
2574 && !h
->pointer_equality_needed
2575 && h
->plt
.refcount
> 0
2576 && h
->got
.refcount
> 0)
2578 /* Don't use the regular PLT if there are both GOT and GOTPLT
2580 h
->plt
.offset
= (bfd_vma
) -1;
2582 /* Use the GOT PLT. */
2583 eh
->plt_got
.refcount
= 1;
2586 /* Clear the reference count of function pointer relocations if
2587 symbol isn't a normal function. */
2588 if (h
->type
!= STT_FUNC
)
2589 eh
->func_pointer_refcount
= 0;
2591 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2592 here if it is defined and referenced in a non-shared object. */
2593 if (h
->type
== STT_GNU_IFUNC
2596 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2602 asection
*s
= htab
->plt_bnd
;
2603 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
2605 /* Use the .plt.bnd section if it is created. */
2606 eh
->plt_bnd
.offset
= s
->size
;
2608 /* Make room for this entry in the .plt.bnd section. */
2609 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2617 /* Don't create the PLT entry if there are only function pointer
2618 relocations which can be resolved at run-time. */
2619 else if (htab
->elf
.dynamic_sections_created
2620 && (h
->plt
.refcount
> eh
->func_pointer_refcount
2621 || eh
->plt_got
.refcount
> 0))
2623 bfd_boolean use_plt_got
;
2625 /* Clear the reference count of function pointer relocations
2627 eh
->func_pointer_refcount
= 0;
2629 if ((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2631 /* Don't use the regular PLT for DF_BIND_NOW. */
2632 h
->plt
.offset
= (bfd_vma
) -1;
2634 /* Use the GOT PLT. */
2635 h
->got
.refcount
= 1;
2636 eh
->plt_got
.refcount
= 1;
2639 use_plt_got
= eh
->plt_got
.refcount
> 0;
2641 /* Make sure this symbol is output as a dynamic symbol.
2642 Undefined weak syms won't yet be marked as dynamic. */
2643 if (h
->dynindx
== -1
2644 && !h
->forced_local
)
2646 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2650 if (bfd_link_pic (info
)
2651 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2653 asection
*s
= htab
->elf
.splt
;
2654 asection
*bnd_s
= htab
->plt_bnd
;
2655 asection
*got_s
= htab
->plt_got
;
2657 /* If this is the first .plt entry, make room for the special
2658 first entry. The .plt section is used by prelink to undo
2659 prelinking for dynamic relocations. */
2661 s
->size
= plt_entry_size
;
2664 eh
->plt_got
.offset
= got_s
->size
;
2667 h
->plt
.offset
= s
->size
;
2669 eh
->plt_bnd
.offset
= bnd_s
->size
;
2672 /* If this symbol is not defined in a regular file, and we are
2673 not generating a shared library, then set the symbol to this
2674 location in the .plt. This is required to make function
2675 pointers compare as equal between the normal executable and
2676 the shared library. */
2677 if (! bfd_link_pic (info
)
2682 /* We need to make a call to the entry of the GOT PLT
2683 instead of regular PLT entry. */
2684 h
->root
.u
.def
.section
= got_s
;
2685 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
2691 /* We need to make a call to the entry of the second
2692 PLT instead of regular PLT entry. */
2693 h
->root
.u
.def
.section
= bnd_s
;
2694 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
2698 h
->root
.u
.def
.section
= s
;
2699 h
->root
.u
.def
.value
= h
->plt
.offset
;
2704 /* Make room for this entry. */
2706 got_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2709 s
->size
+= plt_entry_size
;
2711 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2713 /* We also need to make an entry in the .got.plt section,
2714 which will be placed in the .got section by the linker
2716 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2718 /* We also need to make an entry in the .rela.plt
2720 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2721 htab
->elf
.srelplt
->reloc_count
++;
2726 h
->plt
.offset
= (bfd_vma
) -1;
2732 h
->plt
.offset
= (bfd_vma
) -1;
2736 eh
->tlsdesc_got
= (bfd_vma
) -1;
2738 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2739 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2740 if (h
->got
.refcount
> 0
2741 && bfd_link_executable (info
)
2743 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2745 h
->got
.offset
= (bfd_vma
) -1;
2747 else if (h
->got
.refcount
> 0)
2751 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2753 /* Make sure this symbol is output as a dynamic symbol.
2754 Undefined weak syms won't yet be marked as dynamic. */
2755 if (h
->dynindx
== -1
2756 && !h
->forced_local
)
2758 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2762 if (GOT_TLS_GDESC_P (tls_type
))
2764 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2765 - elf_x86_64_compute_jump_table_size (htab
);
2766 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2767 h
->got
.offset
= (bfd_vma
) -2;
2769 if (! GOT_TLS_GDESC_P (tls_type
)
2770 || GOT_TLS_GD_P (tls_type
))
2773 h
->got
.offset
= s
->size
;
2774 s
->size
+= GOT_ENTRY_SIZE
;
2775 if (GOT_TLS_GD_P (tls_type
))
2776 s
->size
+= GOT_ENTRY_SIZE
;
2778 dyn
= htab
->elf
.dynamic_sections_created
;
2779 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2781 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2782 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2783 || tls_type
== GOT_TLS_IE
)
2784 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2785 else if (GOT_TLS_GD_P (tls_type
))
2786 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2787 else if (! GOT_TLS_GDESC_P (tls_type
)
2788 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2789 || h
->root
.type
!= bfd_link_hash_undefweak
)
2790 && (bfd_link_pic (info
)
2791 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2792 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2793 if (GOT_TLS_GDESC_P (tls_type
))
2795 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2796 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2800 h
->got
.offset
= (bfd_vma
) -1;
2802 if (eh
->dyn_relocs
== NULL
)
2805 /* In the shared -Bsymbolic case, discard space allocated for
2806 dynamic pc-relative relocs against symbols which turn out to be
2807 defined in regular objects. For the normal shared case, discard
2808 space for pc-relative relocs that have become local due to symbol
2809 visibility changes. */
2811 if (bfd_link_pic (info
))
2813 /* Relocs that use pc_count are those that appear on a call
2814 insn, or certain REL relocs that can generated via assembly.
2815 We want calls to protected symbols to resolve directly to the
2816 function rather than going via the plt. If people want
2817 function pointer comparisons to work as expected then they
2818 should avoid writing weird assembly. */
2819 if (SYMBOL_CALLS_LOCAL (info
, h
))
2821 struct elf_dyn_relocs
**pp
;
2823 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2825 p
->count
-= p
->pc_count
;
2834 /* Also discard relocs on undefined weak syms with non-default
2836 if (eh
->dyn_relocs
!= NULL
)
2838 if (h
->root
.type
== bfd_link_hash_undefweak
)
2840 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2841 eh
->dyn_relocs
= NULL
;
2843 /* Make sure undefined weak symbols are output as a dynamic
2845 else if (h
->dynindx
== -1
2846 && ! h
->forced_local
2847 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2850 /* For PIE, discard space for pc-relative relocs against
2851 symbols which turn out to need copy relocs. */
2852 else if (bfd_link_executable (info
)
2853 && (h
->needs_copy
|| eh
->needs_copy
)
2857 struct elf_dyn_relocs
**pp
;
2859 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2861 if (p
->pc_count
!= 0)
2869 else if (ELIMINATE_COPY_RELOCS
)
2871 /* For the non-shared case, discard space for relocs against
2872 symbols which turn out to need copy relocs or are not
2873 dynamic. Keep dynamic relocations for run-time function
2874 pointer initialization. */
2876 if ((!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
2879 || (htab
->elf
.dynamic_sections_created
2880 && (h
->root
.type
== bfd_link_hash_undefweak
2881 || h
->root
.type
== bfd_link_hash_undefined
))))
2883 /* Make sure this symbol is output as a dynamic symbol.
2884 Undefined weak syms won't yet be marked as dynamic. */
2885 if (h
->dynindx
== -1
2886 && ! h
->forced_local
2887 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2890 /* If that succeeded, we know we'll be keeping all the
2892 if (h
->dynindx
!= -1)
2896 eh
->dyn_relocs
= NULL
;
2897 eh
->func_pointer_refcount
= 0;
2902 /* Finally, allocate space. */
2903 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2907 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2909 BFD_ASSERT (sreloc
!= NULL
);
2911 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2917 /* Allocate space in .plt, .got and associated reloc sections for
2918 local dynamic relocs. */
2921 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2923 struct elf_link_hash_entry
*h
2924 = (struct elf_link_hash_entry
*) *slot
;
2926 if (h
->type
!= STT_GNU_IFUNC
2930 || h
->root
.type
!= bfd_link_hash_defined
)
2933 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2936 /* Find any dynamic relocs that apply to read-only sections. */
2939 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2942 struct elf_x86_64_link_hash_entry
*eh
;
2943 struct elf_dyn_relocs
*p
;
2945 /* Skip local IFUNC symbols. */
2946 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2949 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2950 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2952 asection
*s
= p
->sec
->output_section
;
2954 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2956 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2958 info
->flags
|= DF_TEXTREL
;
2960 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
2961 || info
->error_textrel
)
2962 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2963 p
->sec
->owner
, h
->root
.root
.string
,
2966 /* Not an error, just cut short the traversal. */
2973 /* With the local symbol, foo, we convert
2974 mov foo@GOTPCREL(%rip), %reg
2978 call/jmp *foo@GOTPCREL(%rip)
2980 nop call foo/jmp foo nop
2981 When PIC is false, convert
2982 test %reg, foo@GOTPCREL(%rip)
2986 binop foo@GOTPCREL(%rip), %reg
2989 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2993 elf_x86_64_convert_load (bfd
*abfd
, asection
*sec
,
2994 struct bfd_link_info
*link_info
)
2996 Elf_Internal_Shdr
*symtab_hdr
;
2997 Elf_Internal_Rela
*internal_relocs
;
2998 Elf_Internal_Rela
*irel
, *irelend
;
3000 struct elf_x86_64_link_hash_table
*htab
;
3001 bfd_boolean changed_contents
;
3002 bfd_boolean changed_relocs
;
3003 bfd_signed_vma
*local_got_refcounts
;
3004 bfd_vma maxpagesize
;
3006 /* Don't even try to convert non-ELF outputs. */
3007 if (!is_elf_hash_table (link_info
->hash
))
3010 /* Nothing to do if there is no need or no output. */
3011 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
3012 || sec
->need_convert_load
== 0
3013 || bfd_is_abs_section (sec
->output_section
))
3016 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3018 /* Load the relocations for this section. */
3019 internal_relocs
= (_bfd_elf_link_read_relocs
3020 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
3021 link_info
->keep_memory
));
3022 if (internal_relocs
== NULL
)
3025 htab
= elf_x86_64_hash_table (link_info
);
3026 changed_contents
= FALSE
;
3027 changed_relocs
= FALSE
;
3028 local_got_refcounts
= elf_local_got_refcounts (abfd
);
3029 maxpagesize
= get_elf_backend_data (abfd
)->maxpagesize
;
3031 /* Get the section contents. */
3032 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
3033 contents
= elf_section_data (sec
)->this_hdr
.contents
;
3036 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
3040 irelend
= internal_relocs
+ sec
->reloc_count
;
3041 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
3043 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
3044 unsigned int r_symndx
= htab
->r_sym (irel
->r_info
);
3046 struct elf_link_hash_entry
*h
;
3050 bfd_signed_vma raddend
;
3051 unsigned int opcode
;
3054 if (r_type
!= R_X86_64_GOTPCREL
3055 && r_type
!= R_X86_64_GOTPCRELX
3056 && r_type
!= R_X86_64_REX_GOTPCRELX
)
3059 roff
= irel
->r_offset
;
3060 if (roff
< (r_type
== R_X86_64_REX_GOTPCRELX
? 3 : 2))
3063 raddend
= irel
->r_addend
;
3064 /* Addend for 32-bit PC-relative relocation must be -4. */
3068 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
3070 /* It is OK to convert mov to lea. */
3073 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
3074 for mov call, jmp or one of adc, add, and, cmp, or, sbb,
3075 sub, test, xor instructions. */
3076 if (r_type
!= R_X86_64_GOTPCRELX
3077 && r_type
!= R_X86_64_REX_GOTPCRELX
)
3080 /* It is OK to convert indirect branch to direct branch. */
3083 /* It is OK to convert adc, add, and, cmp, or, sbb, sub,
3084 test, xor only when PIC is false. */
3085 if (bfd_link_pic (link_info
))
3090 /* Get the symbol referred to by the reloc. */
3091 if (r_symndx
< symtab_hdr
->sh_info
)
3093 Elf_Internal_Sym
*isym
;
3095 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
3098 symtype
= ELF_ST_TYPE (isym
->st_info
);
3100 /* STT_GNU_IFUNC must keep GOTPCREL relocations and skip
3101 relocation against undefined symbols. */
3102 if (symtype
== STT_GNU_IFUNC
|| isym
->st_shndx
== SHN_UNDEF
)
3105 if (isym
->st_shndx
== SHN_ABS
)
3106 tsec
= bfd_abs_section_ptr
;
3107 else if (isym
->st_shndx
== SHN_COMMON
)
3108 tsec
= bfd_com_section_ptr
;
3109 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
3110 tsec
= &_bfd_elf_large_com_section
;
3112 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3115 toff
= isym
->st_value
;
3119 indx
= r_symndx
- symtab_hdr
->sh_info
;
3120 h
= elf_sym_hashes (abfd
)[indx
];
3121 BFD_ASSERT (h
!= NULL
);
3123 while (h
->root
.type
== bfd_link_hash_indirect
3124 || h
->root
.type
== bfd_link_hash_warning
)
3125 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3127 /* STT_GNU_IFUNC must keep GOTPCREL relocations. We also
3128 avoid optimizing GOTPCREL relocations againt _DYNAMIC
3129 since ld.so may use its link-time address. */
3130 if ((h
->root
.type
== bfd_link_hash_defined
3131 || h
->root
.type
== bfd_link_hash_defweak
)
3132 && h
->type
!= STT_GNU_IFUNC
3133 && h
!= htab
->elf
.hdynamic
3134 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3136 tsec
= h
->root
.u
.def
.section
;
3137 toff
= h
->root
.u
.def
.value
;
3144 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3146 /* At this stage in linking, no SEC_MERGE symbol has been
3147 adjusted, so all references to such symbols need to be
3148 passed through _bfd_merged_section_offset. (Later, in
3149 relocate_section, all SEC_MERGE symbols *except* for
3150 section symbols have been adjusted.)
3152 gas may reduce relocations against symbols in SEC_MERGE
3153 sections to a relocation against the section symbol when
3154 the original addend was zero. When the reloc is against
3155 a section symbol we should include the addend in the
3156 offset passed to _bfd_merged_section_offset, since the
3157 location of interest is the original symbol. On the
3158 other hand, an access to "sym+addend" where "sym" is not
3159 a section symbol should not include the addend; Such an
3160 access is presumed to be an offset from "sym"; The
3161 location of interest is just "sym". */
3162 if (symtype
== STT_SECTION
)
3165 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3166 elf_section_data (tsec
)->sec_info
,
3169 if (symtype
!= STT_SECTION
)
3175 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3176 if (tsec
->output_section
== sec
->output_section
)
3178 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3186 /* At this point, we don't know the load addresses of TSEC
3187 section nor SEC section. We estimate the distrance between
3190 for (asect
= sec
->output_section
;
3191 asect
!= NULL
&& asect
!= tsec
->output_section
;
3192 asect
= asect
->next
)
3195 for (i
= asect
->output_section
->map_head
.s
;
3199 size
= align_power (size
, i
->alignment_power
);
3204 /* Don't convert GOTPCREL relocations if TSEC isn't placed
3209 /* Take PT_GNU_RELRO segment into account by adding
3211 if ((toff
+ size
+ maxpagesize
- roff
+ 0x80000000)
3218 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
3222 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
3224 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3228 /* Convert to "jmp foo nop". */
3231 nop_offset
= irel
->r_offset
+ 3;
3232 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3233 irel
->r_offset
-= 1;
3234 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3238 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3241 nop
= ADDR_PREFIX_OPCODE
;
3242 nop_offset
= irel
->r_offset
- 2;
3244 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
3245 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
3246 r_type
= R_X86_64_PC32
;
3252 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
3253 "lea foo(%rip), %reg". */
3255 r_type
= R_X86_64_PC32
;
3259 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3262 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
3263 "test $foo, %reg". */
3264 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
3269 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
3270 "binop $foo, %reg". */
3271 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
3274 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
3276 if (r_type
== R_X86_64_REX_GOTPCRELX
)
3278 /* Move the R bit to the B bit in REX byte. */
3279 unsigned int rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
3280 rex
= (rex
& ~REX_R
) | (rex
& REX_R
) >> 2;
3281 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
3283 /* No addend for R_X86_64_32S relocation. */
3285 r_type
= R_X86_64_32S
;
3288 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
3291 irel
->r_info
= htab
->r_info (r_symndx
, r_type
);
3292 changed_contents
= TRUE
;
3293 changed_relocs
= TRUE
;
3297 if (h
->got
.refcount
> 0)
3298 h
->got
.refcount
-= 1;
3302 if (local_got_refcounts
!= NULL
3303 && local_got_refcounts
[r_symndx
] > 0)
3304 local_got_refcounts
[r_symndx
] -= 1;
3308 if (contents
!= NULL
3309 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3311 if (!changed_contents
&& !link_info
->keep_memory
)
3315 /* Cache the section contents for elf_link_input_bfd. */
3316 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3320 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3322 if (!changed_relocs
)
3323 free (internal_relocs
);
3325 elf_section_data (sec
)->relocs
= internal_relocs
;
3331 if (contents
!= NULL
3332 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3334 if (internal_relocs
!= NULL
3335 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3336 free (internal_relocs
);
3340 /* Set the sizes of the dynamic sections. */
3343 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3344 struct bfd_link_info
*info
)
3346 struct elf_x86_64_link_hash_table
*htab
;
3351 const struct elf_backend_data
*bed
;
3353 htab
= elf_x86_64_hash_table (info
);
3356 bed
= get_elf_backend_data (output_bfd
);
3358 dynobj
= htab
->elf
.dynobj
;
3362 if (htab
->elf
.dynamic_sections_created
)
3364 /* Set the contents of the .interp section to the interpreter. */
3365 if (bfd_link_executable (info
) && !info
->nointerp
)
3367 s
= bfd_get_linker_section (dynobj
, ".interp");
3370 s
->size
= htab
->dynamic_interpreter_size
;
3371 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3375 /* Set up .got offsets for local syms, and space for local dynamic
3377 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3379 bfd_signed_vma
*local_got
;
3380 bfd_signed_vma
*end_local_got
;
3381 char *local_tls_type
;
3382 bfd_vma
*local_tlsdesc_gotent
;
3383 bfd_size_type locsymcount
;
3384 Elf_Internal_Shdr
*symtab_hdr
;
3387 if (! is_x86_64_elf (ibfd
))
3390 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3392 struct elf_dyn_relocs
*p
;
3394 if (!elf_x86_64_convert_load (ibfd
, s
, info
))
3397 for (p
= (struct elf_dyn_relocs
*)
3398 (elf_section_data (s
)->local_dynrel
);
3402 if (!bfd_is_abs_section (p
->sec
)
3403 && bfd_is_abs_section (p
->sec
->output_section
))
3405 /* Input section has been discarded, either because
3406 it is a copy of a linkonce section or due to
3407 linker script /DISCARD/, so we'll be discarding
3410 else if (p
->count
!= 0)
3412 srel
= elf_section_data (p
->sec
)->sreloc
;
3413 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3414 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3415 && (info
->flags
& DF_TEXTREL
) == 0)
3417 info
->flags
|= DF_TEXTREL
;
3418 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3419 || info
->error_textrel
)
3420 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3421 p
->sec
->owner
, p
->sec
);
3427 local_got
= elf_local_got_refcounts (ibfd
);
3431 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3432 locsymcount
= symtab_hdr
->sh_info
;
3433 end_local_got
= local_got
+ locsymcount
;
3434 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3435 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3437 srel
= htab
->elf
.srelgot
;
3438 for (; local_got
< end_local_got
;
3439 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3441 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3444 if (GOT_TLS_GDESC_P (*local_tls_type
))
3446 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3447 - elf_x86_64_compute_jump_table_size (htab
);
3448 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3449 *local_got
= (bfd_vma
) -2;
3451 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3452 || GOT_TLS_GD_P (*local_tls_type
))
3454 *local_got
= s
->size
;
3455 s
->size
+= GOT_ENTRY_SIZE
;
3456 if (GOT_TLS_GD_P (*local_tls_type
))
3457 s
->size
+= GOT_ENTRY_SIZE
;
3459 if (bfd_link_pic (info
)
3460 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3461 || *local_tls_type
== GOT_TLS_IE
)
3463 if (GOT_TLS_GDESC_P (*local_tls_type
))
3465 htab
->elf
.srelplt
->size
3466 += bed
->s
->sizeof_rela
;
3467 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3469 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3470 || GOT_TLS_GD_P (*local_tls_type
))
3471 srel
->size
+= bed
->s
->sizeof_rela
;
3475 *local_got
= (bfd_vma
) -1;
3479 if (htab
->tls_ld_got
.refcount
> 0)
3481 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3483 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3484 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3485 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3488 htab
->tls_ld_got
.offset
= -1;
3490 /* Allocate global sym .plt and .got entries, and space for global
3491 sym dynamic relocs. */
3492 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3495 /* Allocate .plt and .got entries, and space for local symbols. */
3496 htab_traverse (htab
->loc_hash_table
,
3497 elf_x86_64_allocate_local_dynrelocs
,
3500 /* For every jump slot reserved in the sgotplt, reloc_count is
3501 incremented. However, when we reserve space for TLS descriptors,
3502 it's not incremented, so in order to compute the space reserved
3503 for them, it suffices to multiply the reloc count by the jump
3506 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3507 so that R_X86_64_IRELATIVE entries come last. */
3508 if (htab
->elf
.srelplt
)
3510 htab
->sgotplt_jump_table_size
3511 = elf_x86_64_compute_jump_table_size (htab
);
3512 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3514 else if (htab
->elf
.irelplt
)
3515 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3517 if (htab
->tlsdesc_plt
)
3519 /* If we're not using lazy TLS relocations, don't generate the
3520 PLT and GOT entries they require. */
3521 if ((info
->flags
& DF_BIND_NOW
))
3522 htab
->tlsdesc_plt
= 0;
3525 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3526 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3527 /* Reserve room for the initial entry.
3528 FIXME: we could probably do away with it in this case. */
3529 if (htab
->elf
.splt
->size
== 0)
3530 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3531 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3532 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3536 if (htab
->elf
.sgotplt
)
3538 /* Don't allocate .got.plt section if there are no GOT nor PLT
3539 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3540 if ((htab
->elf
.hgot
== NULL
3541 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3542 && (htab
->elf
.sgotplt
->size
3543 == get_elf_backend_data (output_bfd
)->got_header_size
)
3544 && (htab
->elf
.splt
== NULL
3545 || htab
->elf
.splt
->size
== 0)
3546 && (htab
->elf
.sgot
== NULL
3547 || htab
->elf
.sgot
->size
== 0)
3548 && (htab
->elf
.iplt
== NULL
3549 || htab
->elf
.iplt
->size
== 0)
3550 && (htab
->elf
.igotplt
== NULL
3551 || htab
->elf
.igotplt
->size
== 0))
3552 htab
->elf
.sgotplt
->size
= 0;
3555 if (htab
->plt_eh_frame
!= NULL
3556 && htab
->elf
.splt
!= NULL
3557 && htab
->elf
.splt
->size
!= 0
3558 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3559 && _bfd_elf_eh_frame_present (info
))
3561 const struct elf_x86_64_backend_data
*arch_data
3562 = get_elf_x86_64_arch_data (bed
);
3563 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3566 /* We now have determined the sizes of the various dynamic sections.
3567 Allocate memory for them. */
3569 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3571 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3574 if (s
== htab
->elf
.splt
3575 || s
== htab
->elf
.sgot
3576 || s
== htab
->elf
.sgotplt
3577 || s
== htab
->elf
.iplt
3578 || s
== htab
->elf
.igotplt
3579 || s
== htab
->plt_bnd
3580 || s
== htab
->plt_got
3581 || s
== htab
->plt_eh_frame
3582 || s
== htab
->sdynbss
)
3584 /* Strip this section if we don't need it; see the
3587 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3589 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3592 /* We use the reloc_count field as a counter if we need
3593 to copy relocs into the output file. */
3594 if (s
!= htab
->elf
.srelplt
)
3599 /* It's not one of our sections, so don't allocate space. */
3605 /* If we don't need this section, strip it from the
3606 output file. This is mostly to handle .rela.bss and
3607 .rela.plt. We must create both sections in
3608 create_dynamic_sections, because they must be created
3609 before the linker maps input sections to output
3610 sections. The linker does that before
3611 adjust_dynamic_symbol is called, and it is that
3612 function which decides whether anything needs to go
3613 into these sections. */
3615 s
->flags
|= SEC_EXCLUDE
;
3619 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3622 /* Allocate memory for the section contents. We use bfd_zalloc
3623 here in case unused entries are not reclaimed before the
3624 section's contents are written out. This should not happen,
3625 but this way if it does, we get a R_X86_64_NONE reloc instead
3627 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3628 if (s
->contents
== NULL
)
3632 if (htab
->plt_eh_frame
!= NULL
3633 && htab
->plt_eh_frame
->contents
!= NULL
)
3635 const struct elf_x86_64_backend_data
*arch_data
3636 = get_elf_x86_64_arch_data (bed
);
3638 memcpy (htab
->plt_eh_frame
->contents
,
3639 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3640 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3641 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3644 if (htab
->elf
.dynamic_sections_created
)
3646 /* Add some entries to the .dynamic section. We fill in the
3647 values later, in elf_x86_64_finish_dynamic_sections, but we
3648 must add the entries now so that we get the correct size for
3649 the .dynamic section. The DT_DEBUG entry is filled in by the
3650 dynamic linker and used by the debugger. */
3651 #define add_dynamic_entry(TAG, VAL) \
3652 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3654 if (bfd_link_executable (info
))
3656 if (!add_dynamic_entry (DT_DEBUG
, 0))
3660 if (htab
->elf
.splt
->size
!= 0)
3662 /* DT_PLTGOT is used by prelink even if there is no PLT
3664 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3667 if (htab
->elf
.srelplt
->size
!= 0)
3669 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3670 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3671 || !add_dynamic_entry (DT_JMPREL
, 0))
3675 if (htab
->tlsdesc_plt
3676 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3677 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3683 if (!add_dynamic_entry (DT_RELA
, 0)
3684 || !add_dynamic_entry (DT_RELASZ
, 0)
3685 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3688 /* If any dynamic relocs apply to a read-only section,
3689 then we need a DT_TEXTREL entry. */
3690 if ((info
->flags
& DF_TEXTREL
) == 0)
3691 elf_link_hash_traverse (&htab
->elf
,
3692 elf_x86_64_readonly_dynrelocs
,
3695 if ((info
->flags
& DF_TEXTREL
) != 0)
3697 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3698 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3700 info
->callbacks
->einfo
3701 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3702 bfd_set_error (bfd_error_bad_value
);
3706 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3711 #undef add_dynamic_entry
3717 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3718 struct bfd_link_info
*info
)
3720 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3724 struct elf_link_hash_entry
*tlsbase
;
3726 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3727 "_TLS_MODULE_BASE_",
3728 FALSE
, FALSE
, FALSE
);
3730 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3732 struct elf_x86_64_link_hash_table
*htab
;
3733 struct bfd_link_hash_entry
*bh
= NULL
;
3734 const struct elf_backend_data
*bed
3735 = get_elf_backend_data (output_bfd
);
3737 htab
= elf_x86_64_hash_table (info
);
3741 if (!(_bfd_generic_link_add_one_symbol
3742 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3743 tls_sec
, 0, NULL
, FALSE
,
3744 bed
->collect
, &bh
)))
3747 htab
->tls_module_base
= bh
;
3749 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3750 tlsbase
->def_regular
= 1;
3751 tlsbase
->other
= STV_HIDDEN
;
3752 tlsbase
->root
.linker_def
= 1;
3753 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3760 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3761 executables. Rather than setting it to the beginning of the TLS
3762 section, we have to set it to the end. This function may be called
3763 multiple times, it is idempotent. */
3766 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3768 struct elf_x86_64_link_hash_table
*htab
;
3769 struct bfd_link_hash_entry
*base
;
3771 if (!bfd_link_executable (info
))
3774 htab
= elf_x86_64_hash_table (info
);
3778 base
= htab
->tls_module_base
;
3782 base
->u
.def
.value
= htab
->elf
.tls_size
;
3785 /* Return the base VMA address which should be subtracted from real addresses
3786 when resolving @dtpoff relocation.
3787 This is PT_TLS segment p_vaddr. */
3790 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3792 /* If tls_sec is NULL, we should have signalled an error already. */
3793 if (elf_hash_table (info
)->tls_sec
== NULL
)
3795 return elf_hash_table (info
)->tls_sec
->vma
;
3798 /* Return the relocation value for @tpoff relocation
3799 if STT_TLS virtual address is ADDRESS. */
3802 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3804 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3805 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3806 bfd_vma static_tls_size
;
3808 /* If tls_segment is NULL, we should have signalled an error already. */
3809 if (htab
->tls_sec
== NULL
)
3812 /* Consider special static TLS alignment requirements. */
3813 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3814 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3817 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3821 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3823 /* Opcode Instruction
3826 0x0f 0x8x conditional jump */
3828 && (contents
[offset
- 1] == 0xe8
3829 || contents
[offset
- 1] == 0xe9))
3831 && contents
[offset
- 2] == 0x0f
3832 && (contents
[offset
- 1] & 0xf0) == 0x80));
3835 /* Relocate an x86_64 ELF section. */
3838 elf_x86_64_relocate_section (bfd
*output_bfd
,
3839 struct bfd_link_info
*info
,
3841 asection
*input_section
,
3843 Elf_Internal_Rela
*relocs
,
3844 Elf_Internal_Sym
*local_syms
,
3845 asection
**local_sections
)
3847 struct elf_x86_64_link_hash_table
*htab
;
3848 Elf_Internal_Shdr
*symtab_hdr
;
3849 struct elf_link_hash_entry
**sym_hashes
;
3850 bfd_vma
*local_got_offsets
;
3851 bfd_vma
*local_tlsdesc_gotents
;
3852 Elf_Internal_Rela
*rel
;
3853 Elf_Internal_Rela
*relend
;
3854 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3856 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3858 htab
= elf_x86_64_hash_table (info
);
3861 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3862 sym_hashes
= elf_sym_hashes (input_bfd
);
3863 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3864 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3866 elf_x86_64_set_tls_module_base (info
);
3869 relend
= relocs
+ input_section
->reloc_count
;
3870 for (; rel
< relend
; rel
++)
3872 unsigned int r_type
;
3873 reloc_howto_type
*howto
;
3874 unsigned long r_symndx
;
3875 struct elf_link_hash_entry
*h
;
3876 struct elf_x86_64_link_hash_entry
*eh
;
3877 Elf_Internal_Sym
*sym
;
3879 bfd_vma off
, offplt
, plt_offset
;
3881 bfd_boolean unresolved_reloc
;
3882 bfd_reloc_status_type r
;
3884 asection
*base_got
, *resolved_plt
;
3887 r_type
= ELF32_R_TYPE (rel
->r_info
);
3888 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3889 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3892 if (r_type
>= (int) R_X86_64_standard
)
3894 (*_bfd_error_handler
)
3895 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3896 input_bfd
, input_section
, r_type
);
3897 bfd_set_error (bfd_error_bad_value
);
3901 if (r_type
!= (int) R_X86_64_32
3902 || ABI_64_P (output_bfd
))
3903 howto
= x86_64_elf_howto_table
+ r_type
;
3905 howto
= (x86_64_elf_howto_table
3906 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3907 r_symndx
= htab
->r_sym (rel
->r_info
);
3911 unresolved_reloc
= FALSE
;
3912 if (r_symndx
< symtab_hdr
->sh_info
)
3914 sym
= local_syms
+ r_symndx
;
3915 sec
= local_sections
[r_symndx
];
3917 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3919 st_size
= sym
->st_size
;
3921 /* Relocate against local STT_GNU_IFUNC symbol. */
3922 if (!bfd_link_relocatable (info
)
3923 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3925 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3930 /* Set STT_GNU_IFUNC symbol value. */
3931 h
->root
.u
.def
.value
= sym
->st_value
;
3932 h
->root
.u
.def
.section
= sec
;
3937 bfd_boolean warned ATTRIBUTE_UNUSED
;
3938 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3940 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3941 r_symndx
, symtab_hdr
, sym_hashes
,
3943 unresolved_reloc
, warned
, ignored
);
3947 if (sec
!= NULL
&& discarded_section (sec
))
3948 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3949 rel
, 1, relend
, howto
, 0, contents
);
3951 if (bfd_link_relocatable (info
))
3954 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
3956 if (r_type
== R_X86_64_64
)
3958 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3959 zero-extend it to 64bit if addend is zero. */
3960 r_type
= R_X86_64_32
;
3961 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3963 else if (r_type
== R_X86_64_SIZE64
)
3965 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3966 zero-extend it to 64bit if addend is zero. */
3967 r_type
= R_X86_64_SIZE32
;
3968 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3972 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3974 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3975 it here if it is defined in a non-shared object. */
3977 && h
->type
== STT_GNU_IFUNC
3983 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3985 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3986 sections because such sections are not SEC_ALLOC and
3987 thus ld.so will not process them. */
3988 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
3992 else if (h
->plt
.offset
== (bfd_vma
) -1)
3995 /* STT_GNU_IFUNC symbol must go through PLT. */
3996 if (htab
->elf
.splt
!= NULL
)
3998 if (htab
->plt_bnd
!= NULL
)
4000 resolved_plt
= htab
->plt_bnd
;
4001 plt_offset
= eh
->plt_bnd
.offset
;
4005 resolved_plt
= htab
->elf
.splt
;
4006 plt_offset
= h
->plt
.offset
;
4011 resolved_plt
= htab
->elf
.iplt
;
4012 plt_offset
= h
->plt
.offset
;
4015 relocation
= (resolved_plt
->output_section
->vma
4016 + resolved_plt
->output_offset
+ plt_offset
);
4021 if (h
->root
.root
.string
)
4022 name
= h
->root
.root
.string
;
4024 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4026 (*_bfd_error_handler
)
4027 (_("%B: relocation %s against STT_GNU_IFUNC "
4028 "symbol `%s' isn't handled by %s"), input_bfd
,
4029 x86_64_elf_howto_table
[r_type
].name
,
4030 name
, __FUNCTION__
);
4031 bfd_set_error (bfd_error_bad_value
);
4035 if (bfd_link_pic (info
))
4040 if (ABI_64_P (output_bfd
))
4044 if (rel
->r_addend
!= 0)
4046 if (h
->root
.root
.string
)
4047 name
= h
->root
.root
.string
;
4049 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4051 (*_bfd_error_handler
)
4052 (_("%B: relocation %s against STT_GNU_IFUNC "
4053 "symbol `%s' has non-zero addend: %d"),
4054 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
4055 name
, rel
->r_addend
);
4056 bfd_set_error (bfd_error_bad_value
);
4060 /* Generate dynamic relcoation only when there is a
4061 non-GOT reference in a shared object. */
4062 if (bfd_link_pic (info
) && h
->non_got_ref
)
4064 Elf_Internal_Rela outrel
;
4067 /* Need a dynamic relocation to get the real function
4069 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
4073 if (outrel
.r_offset
== (bfd_vma
) -1
4074 || outrel
.r_offset
== (bfd_vma
) -2)
4077 outrel
.r_offset
+= (input_section
->output_section
->vma
4078 + input_section
->output_offset
);
4080 if (h
->dynindx
== -1
4082 || bfd_link_executable (info
))
4084 /* This symbol is resolved locally. */
4085 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4086 outrel
.r_addend
= (h
->root
.u
.def
.value
4087 + h
->root
.u
.def
.section
->output_section
->vma
4088 + h
->root
.u
.def
.section
->output_offset
);
4092 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4093 outrel
.r_addend
= 0;
4096 sreloc
= htab
->elf
.irelifunc
;
4097 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4099 /* If this reloc is against an external symbol, we
4100 do not want to fiddle with the addend. Otherwise,
4101 we need to include the symbol value so that it
4102 becomes an addend for the dynamic reloc. For an
4103 internal symbol, we have updated addend. */
4108 case R_X86_64_PC32_BND
:
4110 case R_X86_64_PLT32
:
4111 case R_X86_64_PLT32_BND
:
4114 case R_X86_64_GOTPCREL
:
4115 case R_X86_64_GOTPCRELX
:
4116 case R_X86_64_REX_GOTPCRELX
:
4117 case R_X86_64_GOTPCREL64
:
4118 base_got
= htab
->elf
.sgot
;
4119 off
= h
->got
.offset
;
4121 if (base_got
== NULL
)
4124 if (off
== (bfd_vma
) -1)
4126 /* We can't use h->got.offset here to save state, or
4127 even just remember the offset, as finish_dynamic_symbol
4128 would use that as offset into .got. */
4130 if (htab
->elf
.splt
!= NULL
)
4132 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4133 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4134 base_got
= htab
->elf
.sgotplt
;
4138 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4139 off
= plt_index
* GOT_ENTRY_SIZE
;
4140 base_got
= htab
->elf
.igotplt
;
4143 if (h
->dynindx
== -1
4147 /* This references the local defitionion. We must
4148 initialize this entry in the global offset table.
4149 Since the offset must always be a multiple of 8,
4150 we use the least significant bit to record
4151 whether we have initialized it already.
4153 When doing a dynamic link, we create a .rela.got
4154 relocation entry to initialize the value. This
4155 is done in the finish_dynamic_symbol routine. */
4160 bfd_put_64 (output_bfd
, relocation
,
4161 base_got
->contents
+ off
);
4162 /* Note that this is harmless for the GOTPLT64
4163 case, as -1 | 1 still is -1. */
4169 relocation
= (base_got
->output_section
->vma
4170 + base_got
->output_offset
+ off
);
4176 /* When generating a shared object, the relocations handled here are
4177 copied into the output file to be resolved at run time. */
4180 case R_X86_64_GOT32
:
4181 case R_X86_64_GOT64
:
4182 /* Relocation is to the entry for this symbol in the global
4184 case R_X86_64_GOTPCREL
:
4185 case R_X86_64_GOTPCRELX
:
4186 case R_X86_64_REX_GOTPCRELX
:
4187 case R_X86_64_GOTPCREL64
:
4188 /* Use global offset table entry as symbol value. */
4189 case R_X86_64_GOTPLT64
:
4190 /* This is obsolete and treated the the same as GOT64. */
4191 base_got
= htab
->elf
.sgot
;
4193 if (htab
->elf
.sgot
== NULL
)
4200 off
= h
->got
.offset
;
4202 && h
->plt
.offset
!= (bfd_vma
)-1
4203 && off
== (bfd_vma
)-1)
4205 /* We can't use h->got.offset here to save
4206 state, or even just remember the offset, as
4207 finish_dynamic_symbol would use that as offset into
4209 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4210 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4211 base_got
= htab
->elf
.sgotplt
;
4214 dyn
= htab
->elf
.dynamic_sections_created
;
4216 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4217 || (bfd_link_pic (info
)
4218 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4219 || (ELF_ST_VISIBILITY (h
->other
)
4220 && h
->root
.type
== bfd_link_hash_undefweak
))
4222 /* This is actually a static link, or it is a -Bsymbolic
4223 link and the symbol is defined locally, or the symbol
4224 was forced to be local because of a version file. We
4225 must initialize this entry in the global offset table.
4226 Since the offset must always be a multiple of 8, we
4227 use the least significant bit to record whether we
4228 have initialized it already.
4230 When doing a dynamic link, we create a .rela.got
4231 relocation entry to initialize the value. This is
4232 done in the finish_dynamic_symbol routine. */
4237 bfd_put_64 (output_bfd
, relocation
,
4238 base_got
->contents
+ off
);
4239 /* Note that this is harmless for the GOTPLT64 case,
4240 as -1 | 1 still is -1. */
4245 unresolved_reloc
= FALSE
;
4249 if (local_got_offsets
== NULL
)
4252 off
= local_got_offsets
[r_symndx
];
4254 /* The offset must always be a multiple of 8. We use
4255 the least significant bit to record whether we have
4256 already generated the necessary reloc. */
4261 bfd_put_64 (output_bfd
, relocation
,
4262 base_got
->contents
+ off
);
4264 if (bfd_link_pic (info
))
4267 Elf_Internal_Rela outrel
;
4269 /* We need to generate a R_X86_64_RELATIVE reloc
4270 for the dynamic linker. */
4271 s
= htab
->elf
.srelgot
;
4275 outrel
.r_offset
= (base_got
->output_section
->vma
4276 + base_got
->output_offset
4278 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4279 outrel
.r_addend
= relocation
;
4280 elf_append_rela (output_bfd
, s
, &outrel
);
4283 local_got_offsets
[r_symndx
] |= 1;
4287 if (off
>= (bfd_vma
) -2)
4290 relocation
= base_got
->output_section
->vma
4291 + base_got
->output_offset
+ off
;
4292 if (r_type
!= R_X86_64_GOTPCREL
4293 && r_type
!= R_X86_64_GOTPCRELX
4294 && r_type
!= R_X86_64_REX_GOTPCRELX
4295 && r_type
!= R_X86_64_GOTPCREL64
)
4296 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4297 - htab
->elf
.sgotplt
->output_offset
;
4301 case R_X86_64_GOTOFF64
:
4302 /* Relocation is relative to the start of the global offset
4305 /* Check to make sure it isn't a protected function or data
4306 symbol for shared library since it may not be local when
4307 used as function address or with copy relocation. We also
4308 need to make sure that a symbol is referenced locally. */
4309 if (bfd_link_pic (info
) && h
)
4311 if (!h
->def_regular
)
4315 switch (ELF_ST_VISIBILITY (h
->other
))
4318 v
= _("hidden symbol");
4321 v
= _("internal symbol");
4324 v
= _("protected symbol");
4331 (*_bfd_error_handler
)
4332 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4333 input_bfd
, v
, h
->root
.root
.string
);
4334 bfd_set_error (bfd_error_bad_value
);
4337 else if (!bfd_link_executable (info
)
4338 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4339 && (h
->type
== STT_FUNC
4340 || h
->type
== STT_OBJECT
)
4341 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4343 (*_bfd_error_handler
)
4344 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4346 h
->type
== STT_FUNC
? "function" : "data",
4347 h
->root
.root
.string
);
4348 bfd_set_error (bfd_error_bad_value
);
4353 /* Note that sgot is not involved in this
4354 calculation. We always want the start of .got.plt. If we
4355 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4356 permitted by the ABI, we might have to change this
4358 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4359 + htab
->elf
.sgotplt
->output_offset
;
4362 case R_X86_64_GOTPC32
:
4363 case R_X86_64_GOTPC64
:
4364 /* Use global offset table as symbol value. */
4365 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4366 + htab
->elf
.sgotplt
->output_offset
;
4367 unresolved_reloc
= FALSE
;
4370 case R_X86_64_PLTOFF64
:
4371 /* Relocation is PLT entry relative to GOT. For local
4372 symbols it's the symbol itself relative to GOT. */
4374 /* See PLT32 handling. */
4375 && h
->plt
.offset
!= (bfd_vma
) -1
4376 && htab
->elf
.splt
!= NULL
)
4378 if (htab
->plt_bnd
!= NULL
)
4380 resolved_plt
= htab
->plt_bnd
;
4381 plt_offset
= eh
->plt_bnd
.offset
;
4385 resolved_plt
= htab
->elf
.splt
;
4386 plt_offset
= h
->plt
.offset
;
4389 relocation
= (resolved_plt
->output_section
->vma
4390 + resolved_plt
->output_offset
4392 unresolved_reloc
= FALSE
;
4395 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4396 + htab
->elf
.sgotplt
->output_offset
;
4399 case R_X86_64_PLT32
:
4400 case R_X86_64_PLT32_BND
:
4401 /* Relocation is to the entry for this symbol in the
4402 procedure linkage table. */
4404 /* Resolve a PLT32 reloc against a local symbol directly,
4405 without using the procedure linkage table. */
4409 if ((h
->plt
.offset
== (bfd_vma
) -1
4410 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4411 || htab
->elf
.splt
== NULL
)
4413 /* We didn't make a PLT entry for this symbol. This
4414 happens when statically linking PIC code, or when
4415 using -Bsymbolic. */
4419 if (h
->plt
.offset
!= (bfd_vma
) -1)
4421 if (htab
->plt_bnd
!= NULL
)
4423 resolved_plt
= htab
->plt_bnd
;
4424 plt_offset
= eh
->plt_bnd
.offset
;
4428 resolved_plt
= htab
->elf
.splt
;
4429 plt_offset
= h
->plt
.offset
;
4434 /* Use the GOT PLT. */
4435 resolved_plt
= htab
->plt_got
;
4436 plt_offset
= eh
->plt_got
.offset
;
4439 relocation
= (resolved_plt
->output_section
->vma
4440 + resolved_plt
->output_offset
4442 unresolved_reloc
= FALSE
;
4445 case R_X86_64_SIZE32
:
4446 case R_X86_64_SIZE64
:
4447 /* Set to symbol size. */
4448 relocation
= st_size
;
4454 case R_X86_64_PC32_BND
:
4455 /* Don't complain about -fPIC if the symbol is undefined when
4456 building executable. */
4457 if (bfd_link_pic (info
)
4458 && (input_section
->flags
& SEC_ALLOC
) != 0
4459 && (input_section
->flags
& SEC_READONLY
) != 0
4461 && !(bfd_link_executable (info
)
4462 && h
->root
.type
== bfd_link_hash_undefined
))
4464 bfd_boolean fail
= FALSE
;
4466 = ((r_type
== R_X86_64_PC32
4467 || r_type
== R_X86_64_PC32_BND
)
4468 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4470 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4472 /* Symbol is referenced locally. Make sure it is
4473 defined locally or for a branch. */
4474 fail
= !h
->def_regular
&& !branch
;
4476 else if (!(bfd_link_executable (info
)
4477 && (h
->needs_copy
|| eh
->needs_copy
)))
4479 /* Symbol doesn't need copy reloc and isn't referenced
4480 locally. We only allow branch to symbol with
4481 non-default visibility. */
4483 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4490 const char *pic
= "";
4492 switch (ELF_ST_VISIBILITY (h
->other
))
4495 v
= _("hidden symbol");
4498 v
= _("internal symbol");
4501 v
= _("protected symbol");
4505 pic
= _("; recompile with -fPIC");
4510 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4512 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4514 (*_bfd_error_handler
) (fmt
, input_bfd
,
4515 x86_64_elf_howto_table
[r_type
].name
,
4516 v
, h
->root
.root
.string
, pic
);
4517 bfd_set_error (bfd_error_bad_value
);
4528 /* FIXME: The ABI says the linker should make sure the value is
4529 the same when it's zeroextended to 64 bit. */
4532 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4535 /* Don't copy a pc-relative relocation into the output file
4536 if the symbol needs copy reloc or the symbol is undefined
4537 when building executable. Copy dynamic function pointer
4539 if ((bfd_link_pic (info
)
4540 && !(bfd_link_executable (info
)
4544 || h
->root
.type
== bfd_link_hash_undefined
)
4545 && IS_X86_64_PCREL_TYPE (r_type
))
4547 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4548 || h
->root
.type
!= bfd_link_hash_undefweak
)
4549 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4550 && r_type
!= R_X86_64_SIZE32
4551 && r_type
!= R_X86_64_SIZE64
)
4552 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4553 || (ELIMINATE_COPY_RELOCS
4554 && !bfd_link_pic (info
)
4557 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4560 || h
->root
.type
== bfd_link_hash_undefweak
4561 || h
->root
.type
== bfd_link_hash_undefined
)))
4563 Elf_Internal_Rela outrel
;
4564 bfd_boolean skip
, relocate
;
4567 /* When generating a shared object, these relocations
4568 are copied into the output file to be resolved at run
4574 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4576 if (outrel
.r_offset
== (bfd_vma
) -1)
4578 else if (outrel
.r_offset
== (bfd_vma
) -2)
4579 skip
= TRUE
, relocate
= TRUE
;
4581 outrel
.r_offset
+= (input_section
->output_section
->vma
4582 + input_section
->output_offset
);
4585 memset (&outrel
, 0, sizeof outrel
);
4587 /* h->dynindx may be -1 if this symbol was marked to
4591 && (IS_X86_64_PCREL_TYPE (r_type
)
4592 || ! bfd_link_pic (info
)
4593 || ! SYMBOLIC_BIND (info
, h
)
4594 || ! h
->def_regular
))
4596 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4597 outrel
.r_addend
= rel
->r_addend
;
4601 /* This symbol is local, or marked to become local. */
4602 if (r_type
== htab
->pointer_r_type
)
4605 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4606 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4608 else if (r_type
== R_X86_64_64
4609 && !ABI_64_P (output_bfd
))
4612 outrel
.r_info
= htab
->r_info (0,
4613 R_X86_64_RELATIVE64
);
4614 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4615 /* Check addend overflow. */
4616 if ((outrel
.r_addend
& 0x80000000)
4617 != (rel
->r_addend
& 0x80000000))
4620 int addend
= rel
->r_addend
;
4621 if (h
&& h
->root
.root
.string
)
4622 name
= h
->root
.root
.string
;
4624 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4627 (*_bfd_error_handler
)
4628 (_("%B: addend -0x%x in relocation %s against "
4629 "symbol `%s' at 0x%lx in section `%A' is "
4631 input_bfd
, input_section
, addend
,
4632 x86_64_elf_howto_table
[r_type
].name
,
4633 name
, (unsigned long) rel
->r_offset
);
4635 (*_bfd_error_handler
)
4636 (_("%B: addend 0x%x in relocation %s against "
4637 "symbol `%s' at 0x%lx in section `%A' is "
4639 input_bfd
, input_section
, addend
,
4640 x86_64_elf_howto_table
[r_type
].name
,
4641 name
, (unsigned long) rel
->r_offset
);
4642 bfd_set_error (bfd_error_bad_value
);
4650 if (bfd_is_abs_section (sec
))
4652 else if (sec
== NULL
|| sec
->owner
== NULL
)
4654 bfd_set_error (bfd_error_bad_value
);
4661 /* We are turning this relocation into one
4662 against a section symbol. It would be
4663 proper to subtract the symbol's value,
4664 osec->vma, from the emitted reloc addend,
4665 but ld.so expects buggy relocs. */
4666 osec
= sec
->output_section
;
4667 sindx
= elf_section_data (osec
)->dynindx
;
4670 asection
*oi
= htab
->elf
.text_index_section
;
4671 sindx
= elf_section_data (oi
)->dynindx
;
4673 BFD_ASSERT (sindx
!= 0);
4676 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4677 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4681 sreloc
= elf_section_data (input_section
)->sreloc
;
4683 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4685 r
= bfd_reloc_notsupported
;
4686 goto check_relocation_error
;
4689 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4691 /* If this reloc is against an external symbol, we do
4692 not want to fiddle with the addend. Otherwise, we
4693 need to include the symbol value so that it becomes
4694 an addend for the dynamic reloc. */
4701 case R_X86_64_TLSGD
:
4702 case R_X86_64_GOTPC32_TLSDESC
:
4703 case R_X86_64_TLSDESC_CALL
:
4704 case R_X86_64_GOTTPOFF
:
4705 tls_type
= GOT_UNKNOWN
;
4706 if (h
== NULL
&& local_got_offsets
)
4707 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4709 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4711 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4712 input_section
, contents
,
4713 symtab_hdr
, sym_hashes
,
4714 &r_type
, tls_type
, rel
,
4715 relend
, h
, r_symndx
))
4718 if (r_type
== R_X86_64_TPOFF32
)
4720 bfd_vma roff
= rel
->r_offset
;
4722 BFD_ASSERT (! unresolved_reloc
);
4724 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4726 /* GD->LE transition. For 64bit, change
4727 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4728 .word 0x6666; rex64; call __tls_get_addr
4731 leaq foo@tpoff(%rax), %rax
4733 leaq foo@tlsgd(%rip), %rdi
4734 .word 0x6666; rex64; call __tls_get_addr
4737 leaq foo@tpoff(%rax), %rax
4738 For largepic, change:
4739 leaq foo@tlsgd(%rip), %rdi
4740 movabsq $__tls_get_addr@pltoff, %rax
4745 leaq foo@tpoff(%rax), %rax
4746 nopw 0x0(%rax,%rax,1) */
4748 if (ABI_64_P (output_bfd
)
4749 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4751 memcpy (contents
+ roff
- 3,
4752 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4753 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4756 else if (ABI_64_P (output_bfd
))
4757 memcpy (contents
+ roff
- 4,
4758 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4761 memcpy (contents
+ roff
- 3,
4762 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4764 bfd_put_32 (output_bfd
,
4765 elf_x86_64_tpoff (info
, relocation
),
4766 contents
+ roff
+ 8 + largepic
);
4767 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4771 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4773 /* GDesc -> LE transition.
4774 It's originally something like:
4775 leaq x@tlsdesc(%rip), %rax
4778 movl $x@tpoff, %rax. */
4780 unsigned int val
, type
;
4782 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4783 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4784 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4785 contents
+ roff
- 3);
4786 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4787 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4788 contents
+ roff
- 1);
4789 bfd_put_32 (output_bfd
,
4790 elf_x86_64_tpoff (info
, relocation
),
4794 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4796 /* GDesc -> LE transition.
4801 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4802 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4805 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4807 /* IE->LE transition:
4808 For 64bit, originally it can be one of:
4809 movq foo@gottpoff(%rip), %reg
4810 addq foo@gottpoff(%rip), %reg
4813 leaq foo(%reg), %reg
4815 For 32bit, originally it can be one of:
4816 movq foo@gottpoff(%rip), %reg
4817 addl foo@gottpoff(%rip), %reg
4820 leal foo(%reg), %reg
4823 unsigned int val
, type
, reg
;
4826 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4829 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4830 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4836 bfd_put_8 (output_bfd
, 0x49,
4837 contents
+ roff
- 3);
4838 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4839 bfd_put_8 (output_bfd
, 0x41,
4840 contents
+ roff
- 3);
4841 bfd_put_8 (output_bfd
, 0xc7,
4842 contents
+ roff
- 2);
4843 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4844 contents
+ roff
- 1);
4848 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4851 bfd_put_8 (output_bfd
, 0x49,
4852 contents
+ roff
- 3);
4853 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4854 bfd_put_8 (output_bfd
, 0x41,
4855 contents
+ roff
- 3);
4856 bfd_put_8 (output_bfd
, 0x81,
4857 contents
+ roff
- 2);
4858 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4859 contents
+ roff
- 1);
4863 /* addq/addl -> leaq/leal */
4865 bfd_put_8 (output_bfd
, 0x4d,
4866 contents
+ roff
- 3);
4867 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4868 bfd_put_8 (output_bfd
, 0x45,
4869 contents
+ roff
- 3);
4870 bfd_put_8 (output_bfd
, 0x8d,
4871 contents
+ roff
- 2);
4872 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4873 contents
+ roff
- 1);
4875 bfd_put_32 (output_bfd
,
4876 elf_x86_64_tpoff (info
, relocation
),
4884 if (htab
->elf
.sgot
== NULL
)
4889 off
= h
->got
.offset
;
4890 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4894 if (local_got_offsets
== NULL
)
4897 off
= local_got_offsets
[r_symndx
];
4898 offplt
= local_tlsdesc_gotents
[r_symndx
];
4905 Elf_Internal_Rela outrel
;
4909 if (htab
->elf
.srelgot
== NULL
)
4912 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4914 if (GOT_TLS_GDESC_P (tls_type
))
4916 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4917 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4918 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4919 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4920 + htab
->elf
.sgotplt
->output_offset
4922 + htab
->sgotplt_jump_table_size
);
4923 sreloc
= htab
->elf
.srelplt
;
4925 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4927 outrel
.r_addend
= 0;
4928 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4931 sreloc
= htab
->elf
.srelgot
;
4933 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4934 + htab
->elf
.sgot
->output_offset
+ off
);
4936 if (GOT_TLS_GD_P (tls_type
))
4937 dr_type
= R_X86_64_DTPMOD64
;
4938 else if (GOT_TLS_GDESC_P (tls_type
))
4941 dr_type
= R_X86_64_TPOFF64
;
4943 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4944 outrel
.r_addend
= 0;
4945 if ((dr_type
== R_X86_64_TPOFF64
4946 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4947 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4948 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4950 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4952 if (GOT_TLS_GD_P (tls_type
))
4956 BFD_ASSERT (! unresolved_reloc
);
4957 bfd_put_64 (output_bfd
,
4958 relocation
- elf_x86_64_dtpoff_base (info
),
4959 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4963 bfd_put_64 (output_bfd
, 0,
4964 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4965 outrel
.r_info
= htab
->r_info (indx
,
4967 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4968 elf_append_rela (output_bfd
, sreloc
,
4977 local_got_offsets
[r_symndx
] |= 1;
4980 if (off
>= (bfd_vma
) -2
4981 && ! GOT_TLS_GDESC_P (tls_type
))
4983 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4985 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4986 || r_type
== R_X86_64_TLSDESC_CALL
)
4987 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4988 + htab
->elf
.sgotplt
->output_offset
4989 + offplt
+ htab
->sgotplt_jump_table_size
;
4991 relocation
= htab
->elf
.sgot
->output_section
->vma
4992 + htab
->elf
.sgot
->output_offset
+ off
;
4993 unresolved_reloc
= FALSE
;
4997 bfd_vma roff
= rel
->r_offset
;
4999 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5001 /* GD->IE transition. For 64bit, change
5002 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5003 .word 0x6666; rex64; call __tls_get_addr@plt
5006 addq foo@gottpoff(%rip), %rax
5008 leaq foo@tlsgd(%rip), %rdi
5009 .word 0x6666; rex64; call __tls_get_addr@plt
5012 addq foo@gottpoff(%rip), %rax
5013 For largepic, change:
5014 leaq foo@tlsgd(%rip), %rdi
5015 movabsq $__tls_get_addr@pltoff, %rax
5020 addq foo@gottpoff(%rax), %rax
5021 nopw 0x0(%rax,%rax,1) */
5023 if (ABI_64_P (output_bfd
)
5024 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
5026 memcpy (contents
+ roff
- 3,
5027 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5028 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5031 else if (ABI_64_P (output_bfd
))
5032 memcpy (contents
+ roff
- 4,
5033 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5036 memcpy (contents
+ roff
- 3,
5037 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5040 relocation
= (htab
->elf
.sgot
->output_section
->vma
5041 + htab
->elf
.sgot
->output_offset
+ off
5044 - input_section
->output_section
->vma
5045 - input_section
->output_offset
5047 bfd_put_32 (output_bfd
, relocation
,
5048 contents
+ roff
+ 8 + largepic
);
5049 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5053 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5055 /* GDesc -> IE transition.
5056 It's originally something like:
5057 leaq x@tlsdesc(%rip), %rax
5060 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5062 /* Now modify the instruction as appropriate. To
5063 turn a leaq into a movq in the form we use it, it
5064 suffices to change the second byte from 0x8d to
5066 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
5068 bfd_put_32 (output_bfd
,
5069 htab
->elf
.sgot
->output_section
->vma
5070 + htab
->elf
.sgot
->output_offset
+ off
5072 - input_section
->output_section
->vma
5073 - input_section
->output_offset
5078 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5080 /* GDesc -> IE transition.
5087 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5088 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5096 case R_X86_64_TLSLD
:
5097 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5098 input_section
, contents
,
5099 symtab_hdr
, sym_hashes
,
5100 &r_type
, GOT_UNKNOWN
,
5101 rel
, relend
, h
, r_symndx
))
5104 if (r_type
!= R_X86_64_TLSLD
)
5106 /* LD->LE transition:
5107 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
5108 For 64bit, we change it into:
5109 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
5110 For 32bit, we change it into:
5111 nopl 0x0(%rax); movl %fs:0, %eax.
5112 For largepic, change:
5113 leaq foo@tlsgd(%rip), %rdi
5114 movabsq $__tls_get_addr@pltoff, %rax
5118 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
5121 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
5122 if (ABI_64_P (output_bfd
)
5123 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
5124 memcpy (contents
+ rel
->r_offset
- 3,
5125 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5126 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5127 else if (ABI_64_P (output_bfd
))
5128 memcpy (contents
+ rel
->r_offset
- 3,
5129 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5131 memcpy (contents
+ rel
->r_offset
- 3,
5132 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5133 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5138 if (htab
->elf
.sgot
== NULL
)
5141 off
= htab
->tls_ld_got
.offset
;
5146 Elf_Internal_Rela outrel
;
5148 if (htab
->elf
.srelgot
== NULL
)
5151 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5152 + htab
->elf
.sgot
->output_offset
+ off
);
5154 bfd_put_64 (output_bfd
, 0,
5155 htab
->elf
.sgot
->contents
+ off
);
5156 bfd_put_64 (output_bfd
, 0,
5157 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5158 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5159 outrel
.r_addend
= 0;
5160 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5162 htab
->tls_ld_got
.offset
|= 1;
5164 relocation
= htab
->elf
.sgot
->output_section
->vma
5165 + htab
->elf
.sgot
->output_offset
+ off
;
5166 unresolved_reloc
= FALSE
;
5169 case R_X86_64_DTPOFF32
:
5170 if (!bfd_link_executable (info
)
5171 || (input_section
->flags
& SEC_CODE
) == 0)
5172 relocation
-= elf_x86_64_dtpoff_base (info
);
5174 relocation
= elf_x86_64_tpoff (info
, relocation
);
5177 case R_X86_64_TPOFF32
:
5178 case R_X86_64_TPOFF64
:
5179 BFD_ASSERT (bfd_link_executable (info
));
5180 relocation
= elf_x86_64_tpoff (info
, relocation
);
5183 case R_X86_64_DTPOFF64
:
5184 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5185 relocation
-= elf_x86_64_dtpoff_base (info
);
5192 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5193 because such sections are not SEC_ALLOC and thus ld.so will
5194 not process them. */
5195 if (unresolved_reloc
5196 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5198 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5199 rel
->r_offset
) != (bfd_vma
) -1)
5201 (*_bfd_error_handler
)
5202 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5205 (long) rel
->r_offset
,
5207 h
->root
.root
.string
);
5212 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5213 contents
, rel
->r_offset
,
5214 relocation
, rel
->r_addend
);
5216 check_relocation_error
:
5217 if (r
!= bfd_reloc_ok
)
5222 name
= h
->root
.root
.string
;
5225 name
= bfd_elf_string_from_elf_section (input_bfd
,
5226 symtab_hdr
->sh_link
,
5231 name
= bfd_section_name (input_bfd
, sec
);
5234 if (r
== bfd_reloc_overflow
)
5236 if (! ((*info
->callbacks
->reloc_overflow
)
5237 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5238 (bfd_vma
) 0, input_bfd
, input_section
,
5244 (*_bfd_error_handler
)
5245 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5246 input_bfd
, input_section
,
5247 (long) rel
->r_offset
, name
, (int) r
);
5256 /* Finish up dynamic symbol handling. We set the contents of various
5257 dynamic sections here. */
5260 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5261 struct bfd_link_info
*info
,
5262 struct elf_link_hash_entry
*h
,
5263 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5265 struct elf_x86_64_link_hash_table
*htab
;
5266 const struct elf_x86_64_backend_data
*abed
;
5267 bfd_boolean use_plt_bnd
;
5268 struct elf_x86_64_link_hash_entry
*eh
;
5270 htab
= elf_x86_64_hash_table (info
);
5274 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5275 section only if there is .plt section. */
5276 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5278 ? &elf_x86_64_bnd_arch_bed
5279 : get_elf_x86_64_backend_data (output_bfd
));
5281 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5283 if (h
->plt
.offset
!= (bfd_vma
) -1)
5286 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5287 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5288 Elf_Internal_Rela rela
;
5290 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5291 const struct elf_backend_data
*bed
;
5292 bfd_vma plt_got_pcrel_offset
;
5294 /* When building a static executable, use .iplt, .igot.plt and
5295 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5296 if (htab
->elf
.splt
!= NULL
)
5298 plt
= htab
->elf
.splt
;
5299 gotplt
= htab
->elf
.sgotplt
;
5300 relplt
= htab
->elf
.srelplt
;
5304 plt
= htab
->elf
.iplt
;
5305 gotplt
= htab
->elf
.igotplt
;
5306 relplt
= htab
->elf
.irelplt
;
5309 /* This symbol has an entry in the procedure linkage table. Set
5311 if ((h
->dynindx
== -1
5312 && !((h
->forced_local
|| bfd_link_executable (info
))
5314 && h
->type
== STT_GNU_IFUNC
))
5320 /* Get the index in the procedure linkage table which
5321 corresponds to this symbol. This is the index of this symbol
5322 in all the symbols for which we are making plt entries. The
5323 first entry in the procedure linkage table is reserved.
5325 Get the offset into the .got table of the entry that
5326 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5327 bytes. The first three are reserved for the dynamic linker.
5329 For static executables, we don't reserve anything. */
5331 if (plt
== htab
->elf
.splt
)
5333 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5334 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5338 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5339 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5342 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5343 plt_plt_offset
= abed
->plt_plt_offset
;
5344 plt_got_insn_size
= abed
->plt_got_insn_size
;
5345 plt_got_offset
= abed
->plt_got_offset
;
5348 /* Use the second PLT with BND relocations. */
5349 const bfd_byte
*plt_entry
, *plt2_entry
;
5351 if (eh
->has_bnd_reloc
)
5353 plt_entry
= elf_x86_64_bnd_plt_entry
;
5354 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5358 plt_entry
= elf_x86_64_legacy_plt_entry
;
5359 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5361 /* Subtract 1 since there is no BND prefix. */
5362 plt_plt_insn_end
-= 1;
5363 plt_plt_offset
-= 1;
5364 plt_got_insn_size
-= 1;
5365 plt_got_offset
-= 1;
5368 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5369 == sizeof (elf_x86_64_legacy_plt_entry
));
5371 /* Fill in the entry in the procedure linkage table. */
5372 memcpy (plt
->contents
+ h
->plt
.offset
,
5373 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5374 /* Fill in the entry in the second PLT. */
5375 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5376 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5378 resolved_plt
= htab
->plt_bnd
;
5379 plt_offset
= eh
->plt_bnd
.offset
;
5383 /* Fill in the entry in the procedure linkage table. */
5384 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5385 abed
->plt_entry_size
);
5388 plt_offset
= h
->plt
.offset
;
5391 /* Insert the relocation positions of the plt section. */
5393 /* Put offset the PC-relative instruction referring to the GOT entry,
5394 subtracting the size of that instruction. */
5395 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5396 + gotplt
->output_offset
5398 - resolved_plt
->output_section
->vma
5399 - resolved_plt
->output_offset
5401 - plt_got_insn_size
);
5403 /* Check PC-relative offset overflow in PLT entry. */
5404 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5405 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5406 output_bfd
, h
->root
.root
.string
);
5408 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5409 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5411 /* Fill in the entry in the global offset table, initially this
5412 points to the second part of the PLT entry. */
5413 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5414 + plt
->output_offset
5415 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5416 gotplt
->contents
+ got_offset
);
5418 /* Fill in the entry in the .rela.plt section. */
5419 rela
.r_offset
= (gotplt
->output_section
->vma
5420 + gotplt
->output_offset
5422 if (h
->dynindx
== -1
5423 || ((bfd_link_executable (info
)
5424 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5426 && h
->type
== STT_GNU_IFUNC
))
5428 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5429 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5430 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5431 rela
.r_addend
= (h
->root
.u
.def
.value
5432 + h
->root
.u
.def
.section
->output_section
->vma
5433 + h
->root
.u
.def
.section
->output_offset
);
5434 /* R_X86_64_IRELATIVE comes last. */
5435 plt_index
= htab
->next_irelative_index
--;
5439 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5441 plt_index
= htab
->next_jump_slot_index
++;
5444 /* Don't fill PLT entry for static executables. */
5445 if (plt
== htab
->elf
.splt
)
5447 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5449 /* Put relocation index. */
5450 bfd_put_32 (output_bfd
, plt_index
,
5451 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5453 /* Put offset for jmp .PLT0 and check for overflow. We don't
5454 check relocation index for overflow since branch displacement
5455 will overflow first. */
5456 if (plt0_offset
> 0x80000000)
5457 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5458 output_bfd
, h
->root
.root
.string
);
5459 bfd_put_32 (output_bfd
, - plt0_offset
,
5460 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5463 bed
= get_elf_backend_data (output_bfd
);
5464 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5465 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5467 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5469 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5470 asection
*plt
, *got
;
5471 bfd_boolean got_after_plt
;
5472 int32_t got_pcrel_offset
;
5473 const bfd_byte
*got_plt_entry
;
5475 /* Set the entry in the GOT procedure linkage table. */
5476 plt
= htab
->plt_got
;
5477 got
= htab
->elf
.sgot
;
5478 got_offset
= h
->got
.offset
;
5480 if (got_offset
== (bfd_vma
) -1
5481 || h
->type
== STT_GNU_IFUNC
5486 /* Use the second PLT entry template for the GOT PLT since they
5487 are the identical. */
5488 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5489 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5490 if (eh
->has_bnd_reloc
)
5491 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5494 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5496 /* Subtract 1 since there is no BND prefix. */
5497 plt_got_insn_size
-= 1;
5498 plt_got_offset
-= 1;
5501 /* Fill in the entry in the GOT procedure linkage table. */
5502 plt_offset
= eh
->plt_got
.offset
;
5503 memcpy (plt
->contents
+ plt_offset
,
5504 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5506 /* Put offset the PC-relative instruction referring to the GOT
5507 entry, subtracting the size of that instruction. */
5508 got_pcrel_offset
= (got
->output_section
->vma
5509 + got
->output_offset
5511 - plt
->output_section
->vma
5512 - plt
->output_offset
5514 - plt_got_insn_size
);
5516 /* Check PC-relative offset overflow in GOT PLT entry. */
5517 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5518 if ((got_after_plt
&& got_pcrel_offset
< 0)
5519 || (!got_after_plt
&& got_pcrel_offset
> 0))
5520 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5521 output_bfd
, h
->root
.root
.string
);
5523 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5524 plt
->contents
+ plt_offset
+ plt_got_offset
);
5528 && (h
->plt
.offset
!= (bfd_vma
) -1
5529 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5531 /* Mark the symbol as undefined, rather than as defined in
5532 the .plt section. Leave the value if there were any
5533 relocations where pointer equality matters (this is a clue
5534 for the dynamic linker, to make function pointer
5535 comparisons work between an application and shared
5536 library), otherwise set it to zero. If a function is only
5537 called from a binary, there is no need to slow down
5538 shared libraries because of that. */
5539 sym
->st_shndx
= SHN_UNDEF
;
5540 if (!h
->pointer_equality_needed
)
5544 if (h
->got
.offset
!= (bfd_vma
) -1
5545 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5546 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5548 Elf_Internal_Rela rela
;
5550 /* This symbol has an entry in the global offset table. Set it
5552 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5555 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5556 + htab
->elf
.sgot
->output_offset
5557 + (h
->got
.offset
&~ (bfd_vma
) 1));
5559 /* If this is a static link, or it is a -Bsymbolic link and the
5560 symbol is defined locally or was forced to be local because
5561 of a version file, we just want to emit a RELATIVE reloc.
5562 The entry in the global offset table will already have been
5563 initialized in the relocate_section function. */
5565 && h
->type
== STT_GNU_IFUNC
)
5567 if (bfd_link_pic (info
))
5569 /* Generate R_X86_64_GLOB_DAT. */
5576 if (!h
->pointer_equality_needed
)
5579 /* For non-shared object, we can't use .got.plt, which
5580 contains the real function addres if we need pointer
5581 equality. We load the GOT entry with the PLT entry. */
5582 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5583 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5584 + plt
->output_offset
5586 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5590 else if (bfd_link_pic (info
)
5591 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5593 if (!h
->def_regular
)
5595 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5596 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5597 rela
.r_addend
= (h
->root
.u
.def
.value
5598 + h
->root
.u
.def
.section
->output_section
->vma
5599 + h
->root
.u
.def
.section
->output_offset
);
5603 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5605 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5606 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5607 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5611 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5616 Elf_Internal_Rela rela
;
5618 /* This symbol needs a copy reloc. Set it up. */
5620 if (h
->dynindx
== -1
5621 || (h
->root
.type
!= bfd_link_hash_defined
5622 && h
->root
.type
!= bfd_link_hash_defweak
)
5623 || htab
->srelbss
== NULL
)
5626 rela
.r_offset
= (h
->root
.u
.def
.value
5627 + h
->root
.u
.def
.section
->output_section
->vma
5628 + h
->root
.u
.def
.section
->output_offset
);
5629 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5631 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5637 /* Finish up local dynamic symbol handling. We set the contents of
5638 various dynamic sections here. */
5641 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5643 struct elf_link_hash_entry
*h
5644 = (struct elf_link_hash_entry
*) *slot
;
5645 struct bfd_link_info
*info
5646 = (struct bfd_link_info
*) inf
;
5648 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5652 /* Used to decide how to sort relocs in an optimal manner for the
5653 dynamic linker, before writing them out. */
5655 static enum elf_reloc_type_class
5656 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
5657 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5658 const Elf_Internal_Rela
*rela
)
5660 bfd
*abfd
= info
->output_bfd
;
5661 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5662 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
5663 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
5664 Elf_Internal_Sym sym
;
5666 if (htab
->elf
.dynsym
== NULL
5667 || !bed
->s
->swap_symbol_in (abfd
,
5668 (htab
->elf
.dynsym
->contents
5669 + r_symndx
* bed
->s
->sizeof_sym
),
5673 /* Check relocation against STT_GNU_IFUNC symbol. */
5674 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5675 return reloc_class_ifunc
;
5677 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5679 case R_X86_64_RELATIVE
:
5680 case R_X86_64_RELATIVE64
:
5681 return reloc_class_relative
;
5682 case R_X86_64_JUMP_SLOT
:
5683 return reloc_class_plt
;
5685 return reloc_class_copy
;
5687 return reloc_class_normal
;
5691 /* Finish up the dynamic sections. */
5694 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5695 struct bfd_link_info
*info
)
5697 struct elf_x86_64_link_hash_table
*htab
;
5700 const struct elf_x86_64_backend_data
*abed
;
5702 htab
= elf_x86_64_hash_table (info
);
5706 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5707 section only if there is .plt section. */
5708 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5709 ? &elf_x86_64_bnd_arch_bed
5710 : get_elf_x86_64_backend_data (output_bfd
));
5712 dynobj
= htab
->elf
.dynobj
;
5713 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5715 if (htab
->elf
.dynamic_sections_created
)
5717 bfd_byte
*dyncon
, *dynconend
;
5718 const struct elf_backend_data
*bed
;
5719 bfd_size_type sizeof_dyn
;
5721 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5724 bed
= get_elf_backend_data (dynobj
);
5725 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5726 dyncon
= sdyn
->contents
;
5727 dynconend
= sdyn
->contents
+ sdyn
->size
;
5728 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5730 Elf_Internal_Dyn dyn
;
5733 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5741 s
= htab
->elf
.sgotplt
;
5742 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5746 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5750 s
= htab
->elf
.srelplt
->output_section
;
5751 dyn
.d_un
.d_val
= s
->size
;
5755 /* The procedure linkage table relocs (DT_JMPREL) should
5756 not be included in the overall relocs (DT_RELA).
5757 Therefore, we override the DT_RELASZ entry here to
5758 make it not include the JMPREL relocs. Since the
5759 linker script arranges for .rela.plt to follow all
5760 other relocation sections, we don't have to worry
5761 about changing the DT_RELA entry. */
5762 if (htab
->elf
.srelplt
!= NULL
)
5764 s
= htab
->elf
.srelplt
->output_section
;
5765 dyn
.d_un
.d_val
-= s
->size
;
5769 case DT_TLSDESC_PLT
:
5771 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5772 + htab
->tlsdesc_plt
;
5775 case DT_TLSDESC_GOT
:
5777 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5778 + htab
->tlsdesc_got
;
5782 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5785 /* Fill in the special first entry in the procedure linkage table. */
5786 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5788 /* Fill in the first entry in the procedure linkage table. */
5789 memcpy (htab
->elf
.splt
->contents
,
5790 abed
->plt0_entry
, abed
->plt_entry_size
);
5791 /* Add offset for pushq GOT+8(%rip), since the instruction
5792 uses 6 bytes subtract this value. */
5793 bfd_put_32 (output_bfd
,
5794 (htab
->elf
.sgotplt
->output_section
->vma
5795 + htab
->elf
.sgotplt
->output_offset
5797 - htab
->elf
.splt
->output_section
->vma
5798 - htab
->elf
.splt
->output_offset
5800 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5801 /* Add offset for the PC-relative instruction accessing GOT+16,
5802 subtracting the offset to the end of that instruction. */
5803 bfd_put_32 (output_bfd
,
5804 (htab
->elf
.sgotplt
->output_section
->vma
5805 + htab
->elf
.sgotplt
->output_offset
5807 - htab
->elf
.splt
->output_section
->vma
5808 - htab
->elf
.splt
->output_offset
5809 - abed
->plt0_got2_insn_end
),
5810 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5812 elf_section_data (htab
->elf
.splt
->output_section
)
5813 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5815 if (htab
->tlsdesc_plt
)
5817 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5818 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5820 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5821 abed
->plt0_entry
, abed
->plt_entry_size
);
5823 /* Add offset for pushq GOT+8(%rip), since the
5824 instruction uses 6 bytes subtract this value. */
5825 bfd_put_32 (output_bfd
,
5826 (htab
->elf
.sgotplt
->output_section
->vma
5827 + htab
->elf
.sgotplt
->output_offset
5829 - htab
->elf
.splt
->output_section
->vma
5830 - htab
->elf
.splt
->output_offset
5833 htab
->elf
.splt
->contents
5834 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5835 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5836 where TGD stands for htab->tlsdesc_got, subtracting the offset
5837 to the end of that instruction. */
5838 bfd_put_32 (output_bfd
,
5839 (htab
->elf
.sgot
->output_section
->vma
5840 + htab
->elf
.sgot
->output_offset
5842 - htab
->elf
.splt
->output_section
->vma
5843 - htab
->elf
.splt
->output_offset
5845 - abed
->plt0_got2_insn_end
),
5846 htab
->elf
.splt
->contents
5847 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5852 if (htab
->plt_bnd
!= NULL
)
5853 elf_section_data (htab
->plt_bnd
->output_section
)
5854 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5856 if (htab
->elf
.sgotplt
)
5858 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5860 (*_bfd_error_handler
)
5861 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5865 /* Fill in the first three entries in the global offset table. */
5866 if (htab
->elf
.sgotplt
->size
> 0)
5868 /* Set the first entry in the global offset table to the address of
5869 the dynamic section. */
5871 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5873 bfd_put_64 (output_bfd
,
5874 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5875 htab
->elf
.sgotplt
->contents
);
5876 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5877 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5878 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5881 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5885 /* Adjust .eh_frame for .plt section. */
5886 if (htab
->plt_eh_frame
!= NULL
5887 && htab
->plt_eh_frame
->contents
!= NULL
)
5889 if (htab
->elf
.splt
!= NULL
5890 && htab
->elf
.splt
->size
!= 0
5891 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5892 && htab
->elf
.splt
->output_section
!= NULL
5893 && htab
->plt_eh_frame
->output_section
!= NULL
)
5895 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5896 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5897 + htab
->plt_eh_frame
->output_offset
5898 + PLT_FDE_START_OFFSET
;
5899 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5900 htab
->plt_eh_frame
->contents
5901 + PLT_FDE_START_OFFSET
);
5903 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5905 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5907 htab
->plt_eh_frame
->contents
))
5912 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5913 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5916 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5917 htab_traverse (htab
->loc_hash_table
,
5918 elf_x86_64_finish_local_dynamic_symbol
,
5924 /* Return an array of PLT entry symbol values. */
5927 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
5930 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5933 bfd_vma
*plt_sym_val
;
5935 bfd_byte
*plt_contents
;
5936 const struct elf_x86_64_backend_data
*bed
;
5937 Elf_Internal_Shdr
*hdr
;
5940 /* Get the .plt section contents. PLT passed down may point to the
5941 .plt.bnd section. Make sure that PLT always points to the .plt
5943 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5948 plt
= bfd_get_section_by_name (abfd
, ".plt");
5951 bed
= &elf_x86_64_bnd_arch_bed
;
5954 bed
= get_elf_x86_64_backend_data (abfd
);
5956 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
5957 if (plt_contents
== NULL
)
5959 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5960 plt_contents
, 0, plt
->size
))
5963 free (plt_contents
);
5967 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
5968 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
5971 hdr
= &elf_section_data (relplt
)->this_hdr
;
5972 count
= relplt
->size
/ hdr
->sh_entsize
;
5974 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
5975 if (plt_sym_val
== NULL
)
5978 for (i
= 0; i
< count
; i
++)
5979 plt_sym_val
[i
] = -1;
5981 plt_offset
= bed
->plt_entry_size
;
5982 p
= relplt
->relocation
;
5983 for (i
= 0; i
< count
; i
++, p
++)
5987 /* Skip unknown relocation. */
5988 if (p
->howto
== NULL
)
5991 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
5992 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
5995 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
5996 + bed
->plt_reloc_offset
));
5997 if (reloc_index
>= count
)
6001 /* This is the index in .plt section. */
6002 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
6003 /* Store VMA + the offset in .plt.bnd section. */
6004 plt_sym_val
[reloc_index
] =
6006 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
6009 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
6010 plt_offset
+= bed
->plt_entry_size
;
6012 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6014 if (plt_offset
>= plt
->size
)
6018 free (plt_contents
);
6023 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6027 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
6034 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6035 as PLT if it exists. */
6036 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6038 plt
= bfd_get_section_by_name (abfd
, ".plt");
6039 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
6040 dynsymcount
, dynsyms
, ret
,
6042 elf_x86_64_get_plt_sym_val
);
6045 /* Handle an x86-64 specific section when reading an object file. This
6046 is called when elfcode.h finds a section with an unknown type. */
6049 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
6050 const char *name
, int shindex
)
6052 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
6055 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
6061 /* Hook called by the linker routine which adds symbols from an object
6062 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6066 elf_x86_64_add_symbol_hook (bfd
*abfd
,
6067 struct bfd_link_info
*info
,
6068 Elf_Internal_Sym
*sym
,
6069 const char **namep ATTRIBUTE_UNUSED
,
6070 flagword
*flagsp ATTRIBUTE_UNUSED
,
6076 switch (sym
->st_shndx
)
6078 case SHN_X86_64_LCOMMON
:
6079 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
6082 lcomm
= bfd_make_section_with_flags (abfd
,
6086 | SEC_LINKER_CREATED
));
6089 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
6092 *valp
= sym
->st_size
;
6096 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
6097 && (abfd
->flags
& DYNAMIC
) == 0
6098 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
6099 elf_tdata (info
->output_bfd
)->has_gnu_symbols
6100 |= elf_gnu_symbol_unique
;
6106 /* Given a BFD section, try to locate the corresponding ELF section
6110 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
6111 asection
*sec
, int *index_return
)
6113 if (sec
== &_bfd_elf_large_com_section
)
6115 *index_return
= SHN_X86_64_LCOMMON
;
6121 /* Process a symbol. */
6124 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
6127 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
6129 switch (elfsym
->internal_elf_sym
.st_shndx
)
6131 case SHN_X86_64_LCOMMON
:
6132 asym
->section
= &_bfd_elf_large_com_section
;
6133 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6134 /* Common symbol doesn't set BSF_GLOBAL. */
6135 asym
->flags
&= ~BSF_GLOBAL
;
6141 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6143 return (sym
->st_shndx
== SHN_COMMON
6144 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6148 elf_x86_64_common_section_index (asection
*sec
)
6150 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6153 return SHN_X86_64_LCOMMON
;
6157 elf_x86_64_common_section (asection
*sec
)
6159 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6160 return bfd_com_section_ptr
;
6162 return &_bfd_elf_large_com_section
;
6166 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6167 const Elf_Internal_Sym
*sym
,
6172 const asection
*oldsec
)
6174 /* A normal common symbol and a large common symbol result in a
6175 normal common symbol. We turn the large common symbol into a
6178 && h
->root
.type
== bfd_link_hash_common
6180 && bfd_is_com_section (*psec
)
6183 if (sym
->st_shndx
== SHN_COMMON
6184 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6186 h
->root
.u
.c
.p
->section
6187 = bfd_make_section_old_way (oldbfd
, "COMMON");
6188 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6190 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6191 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6192 *psec
= bfd_com_section_ptr
;
6199 elf_x86_64_additional_program_headers (bfd
*abfd
,
6200 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6205 /* Check to see if we need a large readonly segment. */
6206 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6207 if (s
&& (s
->flags
& SEC_LOAD
))
6210 /* Check to see if we need a large data segment. Since .lbss sections
6211 is placed right after the .bss section, there should be no need for
6212 a large data segment just because of .lbss. */
6213 s
= bfd_get_section_by_name (abfd
, ".ldata");
6214 if (s
&& (s
->flags
& SEC_LOAD
))
6220 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6223 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6225 if (h
->plt
.offset
!= (bfd_vma
) -1
6227 && !h
->pointer_equality_needed
)
6230 return _bfd_elf_hash_symbol (h
);
6233 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6236 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6237 const bfd_target
*output
)
6239 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6240 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6241 && _bfd_elf_relocs_compatible (input
, output
));
6244 static const struct bfd_elf_special_section
6245 elf_x86_64_special_sections
[]=
6247 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6248 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6249 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6250 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6251 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6252 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6253 { NULL
, 0, 0, 0, 0 }
6256 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6257 #define TARGET_LITTLE_NAME "elf64-x86-64"
6258 #define ELF_ARCH bfd_arch_i386
6259 #define ELF_TARGET_ID X86_64_ELF_DATA
6260 #define ELF_MACHINE_CODE EM_X86_64
6261 #define ELF_MAXPAGESIZE 0x200000
6262 #define ELF_MINPAGESIZE 0x1000
6263 #define ELF_COMMONPAGESIZE 0x1000
6265 #define elf_backend_can_gc_sections 1
6266 #define elf_backend_can_refcount 1
6267 #define elf_backend_want_got_plt 1
6268 #define elf_backend_plt_readonly 1
6269 #define elf_backend_want_plt_sym 0
6270 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6271 #define elf_backend_rela_normal 1
6272 #define elf_backend_plt_alignment 4
6273 #define elf_backend_extern_protected_data 1
6275 #define elf_info_to_howto elf_x86_64_info_to_howto
6277 #define bfd_elf64_bfd_link_hash_table_create \
6278 elf_x86_64_link_hash_table_create
6279 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6280 #define bfd_elf64_bfd_reloc_name_lookup \
6281 elf_x86_64_reloc_name_lookup
6283 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6284 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6285 #define elf_backend_check_relocs elf_x86_64_check_relocs
6286 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6287 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6288 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6289 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6290 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6291 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6292 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6293 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6295 #define elf_backend_write_core_note elf_x86_64_write_core_note
6297 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6298 #define elf_backend_relocate_section elf_x86_64_relocate_section
6299 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6300 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6301 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6302 #define elf_backend_object_p elf64_x86_64_elf_object_p
6303 #define bfd_elf64_mkobject elf_x86_64_mkobject
6304 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6306 #define elf_backend_section_from_shdr \
6307 elf_x86_64_section_from_shdr
6309 #define elf_backend_section_from_bfd_section \
6310 elf_x86_64_elf_section_from_bfd_section
6311 #define elf_backend_add_symbol_hook \
6312 elf_x86_64_add_symbol_hook
6313 #define elf_backend_symbol_processing \
6314 elf_x86_64_symbol_processing
6315 #define elf_backend_common_section_index \
6316 elf_x86_64_common_section_index
6317 #define elf_backend_common_section \
6318 elf_x86_64_common_section
6319 #define elf_backend_common_definition \
6320 elf_x86_64_common_definition
6321 #define elf_backend_merge_symbol \
6322 elf_x86_64_merge_symbol
6323 #define elf_backend_special_sections \
6324 elf_x86_64_special_sections
6325 #define elf_backend_additional_program_headers \
6326 elf_x86_64_additional_program_headers
6327 #define elf_backend_hash_symbol \
6328 elf_x86_64_hash_symbol
6330 #include "elf64-target.h"
6332 /* CloudABI support. */
6334 #undef TARGET_LITTLE_SYM
6335 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6336 #undef TARGET_LITTLE_NAME
6337 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6340 #define ELF_OSABI ELFOSABI_CLOUDABI
6343 #define elf64_bed elf64_x86_64_cloudabi_bed
6345 #include "elf64-target.h"
6347 /* FreeBSD support. */
6349 #undef TARGET_LITTLE_SYM
6350 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6351 #undef TARGET_LITTLE_NAME
6352 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6355 #define ELF_OSABI ELFOSABI_FREEBSD
6358 #define elf64_bed elf64_x86_64_fbsd_bed
6360 #include "elf64-target.h"
6362 /* Solaris 2 support. */
6364 #undef TARGET_LITTLE_SYM
6365 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6366 #undef TARGET_LITTLE_NAME
6367 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6369 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6370 objects won't be recognized. */
6374 #define elf64_bed elf64_x86_64_sol2_bed
6376 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6378 #undef elf_backend_static_tls_alignment
6379 #define elf_backend_static_tls_alignment 16
6381 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6383 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6385 #undef elf_backend_want_plt_sym
6386 #define elf_backend_want_plt_sym 1
6388 #include "elf64-target.h"
6390 /* Native Client support. */
6393 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6395 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6396 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6400 #undef TARGET_LITTLE_SYM
6401 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6402 #undef TARGET_LITTLE_NAME
6403 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6405 #define elf64_bed elf64_x86_64_nacl_bed
6407 #undef ELF_MAXPAGESIZE
6408 #undef ELF_MINPAGESIZE
6409 #undef ELF_COMMONPAGESIZE
6410 #define ELF_MAXPAGESIZE 0x10000
6411 #define ELF_MINPAGESIZE 0x10000
6412 #define ELF_COMMONPAGESIZE 0x10000
6414 /* Restore defaults. */
6416 #undef elf_backend_static_tls_alignment
6417 #undef elf_backend_want_plt_sym
6418 #define elf_backend_want_plt_sym 0
6420 /* NaCl uses substantially different PLT entries for the same effects. */
6422 #undef elf_backend_plt_alignment
6423 #define elf_backend_plt_alignment 5
6424 #define NACL_PLT_ENTRY_SIZE 64
6425 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6427 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6429 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6430 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6431 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6432 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6433 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6435 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6436 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6438 /* 32 bytes of nop to pad out to the standard size. */
6439 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6440 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6441 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6442 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6443 0x66, /* excess data32 prefix */
6447 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6449 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6450 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6451 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6452 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6454 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6455 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6456 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6458 /* Lazy GOT entries point here (32-byte aligned). */
6459 0x68, /* pushq immediate */
6460 0, 0, 0, 0, /* replaced with index into relocation table. */
6461 0xe9, /* jmp relative */
6462 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6464 /* 22 bytes of nop to pad out to the standard size. */
6465 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6466 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6467 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6470 /* .eh_frame covering the .plt section. */
6472 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6474 #if (PLT_CIE_LENGTH != 20 \
6475 || PLT_FDE_LENGTH != 36 \
6476 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6477 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6478 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6480 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6481 0, 0, 0, 0, /* CIE ID */
6482 1, /* CIE version */
6483 'z', 'R', 0, /* Augmentation string */
6484 1, /* Code alignment factor */
6485 0x78, /* Data alignment factor */
6486 16, /* Return address column */
6487 1, /* Augmentation size */
6488 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6489 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6490 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6491 DW_CFA_nop
, DW_CFA_nop
,
6493 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6494 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6495 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6496 0, 0, 0, 0, /* .plt size goes here */
6497 0, /* Augmentation size */
6498 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6499 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6500 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6501 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6502 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6503 13, /* Block length */
6504 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6505 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6506 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6507 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6508 DW_CFA_nop
, DW_CFA_nop
6511 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6513 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6514 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6515 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6516 2, /* plt0_got1_offset */
6517 9, /* plt0_got2_offset */
6518 13, /* plt0_got2_insn_end */
6519 3, /* plt_got_offset */
6520 33, /* plt_reloc_offset */
6521 38, /* plt_plt_offset */
6522 7, /* plt_got_insn_size */
6523 42, /* plt_plt_insn_end */
6524 32, /* plt_lazy_offset */
6525 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6526 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6529 #undef elf_backend_arch_data
6530 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6532 #undef elf_backend_object_p
6533 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6534 #undef elf_backend_modify_segment_map
6535 #define elf_backend_modify_segment_map nacl_modify_segment_map
6536 #undef elf_backend_modify_program_headers
6537 #define elf_backend_modify_program_headers nacl_modify_program_headers
6538 #undef elf_backend_final_write_processing
6539 #define elf_backend_final_write_processing nacl_final_write_processing
6541 #include "elf64-target.h"
6543 /* Native Client x32 support. */
6546 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6548 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6549 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6553 #undef TARGET_LITTLE_SYM
6554 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6555 #undef TARGET_LITTLE_NAME
6556 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6558 #define elf32_bed elf32_x86_64_nacl_bed
6560 #define bfd_elf32_bfd_link_hash_table_create \
6561 elf_x86_64_link_hash_table_create
6562 #define bfd_elf32_bfd_reloc_type_lookup \
6563 elf_x86_64_reloc_type_lookup
6564 #define bfd_elf32_bfd_reloc_name_lookup \
6565 elf_x86_64_reloc_name_lookup
6566 #define bfd_elf32_mkobject \
6568 #define bfd_elf32_get_synthetic_symtab \
6569 elf_x86_64_get_synthetic_symtab
6571 #undef elf_backend_object_p
6572 #define elf_backend_object_p \
6573 elf32_x86_64_nacl_elf_object_p
6575 #undef elf_backend_bfd_from_remote_memory
6576 #define elf_backend_bfd_from_remote_memory \
6577 _bfd_elf32_bfd_from_remote_memory
6579 #undef elf_backend_size_info
6580 #define elf_backend_size_info \
6581 _bfd_elf32_size_info
6583 #include "elf32-target.h"
6585 /* Restore defaults. */
6586 #undef elf_backend_object_p
6587 #define elf_backend_object_p elf64_x86_64_elf_object_p
6588 #undef elf_backend_bfd_from_remote_memory
6589 #undef elf_backend_size_info
6590 #undef elf_backend_modify_segment_map
6591 #undef elf_backend_modify_program_headers
6592 #undef elf_backend_final_write_processing
6594 /* Intel L1OM support. */
6597 elf64_l1om_elf_object_p (bfd
*abfd
)
6599 /* Set the right machine number for an L1OM elf64 file. */
6600 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6604 #undef TARGET_LITTLE_SYM
6605 #define TARGET_LITTLE_SYM l1om_elf64_vec
6606 #undef TARGET_LITTLE_NAME
6607 #define TARGET_LITTLE_NAME "elf64-l1om"
6609 #define ELF_ARCH bfd_arch_l1om
6611 #undef ELF_MACHINE_CODE
6612 #define ELF_MACHINE_CODE EM_L1OM
6617 #define elf64_bed elf64_l1om_bed
6619 #undef elf_backend_object_p
6620 #define elf_backend_object_p elf64_l1om_elf_object_p
6622 /* Restore defaults. */
6623 #undef ELF_MAXPAGESIZE
6624 #undef ELF_MINPAGESIZE
6625 #undef ELF_COMMONPAGESIZE
6626 #define ELF_MAXPAGESIZE 0x200000
6627 #define ELF_MINPAGESIZE 0x1000
6628 #define ELF_COMMONPAGESIZE 0x1000
6629 #undef elf_backend_plt_alignment
6630 #define elf_backend_plt_alignment 4
6631 #undef elf_backend_arch_data
6632 #define elf_backend_arch_data &elf_x86_64_arch_bed
6634 #include "elf64-target.h"
6636 /* FreeBSD L1OM support. */
6638 #undef TARGET_LITTLE_SYM
6639 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6640 #undef TARGET_LITTLE_NAME
6641 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6644 #define ELF_OSABI ELFOSABI_FREEBSD
6647 #define elf64_bed elf64_l1om_fbsd_bed
6649 #include "elf64-target.h"
6651 /* Intel K1OM support. */
6654 elf64_k1om_elf_object_p (bfd
*abfd
)
6656 /* Set the right machine number for an K1OM elf64 file. */
6657 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6661 #undef TARGET_LITTLE_SYM
6662 #define TARGET_LITTLE_SYM k1om_elf64_vec
6663 #undef TARGET_LITTLE_NAME
6664 #define TARGET_LITTLE_NAME "elf64-k1om"
6666 #define ELF_ARCH bfd_arch_k1om
6668 #undef ELF_MACHINE_CODE
6669 #define ELF_MACHINE_CODE EM_K1OM
6674 #define elf64_bed elf64_k1om_bed
6676 #undef elf_backend_object_p
6677 #define elf_backend_object_p elf64_k1om_elf_object_p
6679 #undef elf_backend_static_tls_alignment
6681 #undef elf_backend_want_plt_sym
6682 #define elf_backend_want_plt_sym 0
6684 #include "elf64-target.h"
6686 /* FreeBSD K1OM support. */
6688 #undef TARGET_LITTLE_SYM
6689 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6690 #undef TARGET_LITTLE_NAME
6691 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6694 #define ELF_OSABI ELFOSABI_FREEBSD
6697 #define elf64_bed elf64_k1om_fbsd_bed
6699 #include "elf64-target.h"
6701 /* 32bit x86-64 support. */
6703 #undef TARGET_LITTLE_SYM
6704 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6705 #undef TARGET_LITTLE_NAME
6706 #define TARGET_LITTLE_NAME "elf32-x86-64"
6710 #define ELF_ARCH bfd_arch_i386
6712 #undef ELF_MACHINE_CODE
6713 #define ELF_MACHINE_CODE EM_X86_64
6717 #undef elf_backend_object_p
6718 #define elf_backend_object_p \
6719 elf32_x86_64_elf_object_p
6721 #undef elf_backend_bfd_from_remote_memory
6722 #define elf_backend_bfd_from_remote_memory \
6723 _bfd_elf32_bfd_from_remote_memory
6725 #undef elf_backend_size_info
6726 #define elf_backend_size_info \
6727 _bfd_elf32_size_info
6729 #include "elf32-target.h"