1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2016 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "opcode/i386.h"
35 #include "elf/x86-64.h"
42 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
43 #define MINUS_ONE (~ (bfd_vma) 0)
45 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
46 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
47 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
48 since they are the same. */
50 #define ABI_64_P(abfd) \
51 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
53 /* The relocation "howto" table. Order of fields:
54 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
55 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
56 static reloc_howto_type x86_64_elf_howto_table
[] =
58 HOWTO(R_X86_64_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
59 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
61 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
64 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
65 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
67 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
68 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
70 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
71 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
73 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
74 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
76 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
77 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
79 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
80 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
82 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
85 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
86 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
88 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
89 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
91 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
92 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
94 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
96 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
97 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
98 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
99 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
100 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
101 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
102 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
103 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
105 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
106 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
108 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
109 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
111 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
112 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
114 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
115 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
117 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
118 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
120 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
121 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
123 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
124 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
126 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
127 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
129 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
130 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
131 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
132 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
133 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
134 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
135 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
136 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
138 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
139 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
141 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
142 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
143 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
144 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
145 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
147 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
148 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
150 HOWTO(R_X86_64_SIZE32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
151 bfd_elf_generic_reloc
, "R_X86_64_SIZE32", FALSE
, 0xffffffff, 0xffffffff,
153 HOWTO(R_X86_64_SIZE64
, 0, 4, 64, FALSE
, 0, complain_overflow_unsigned
,
154 bfd_elf_generic_reloc
, "R_X86_64_SIZE64", FALSE
, MINUS_ONE
, MINUS_ONE
,
156 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
157 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
158 "R_X86_64_GOTPC32_TLSDESC",
159 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
160 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
161 complain_overflow_dont
, bfd_elf_generic_reloc
,
162 "R_X86_64_TLSDESC_CALL",
164 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
165 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
167 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
168 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
169 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
171 HOWTO(R_X86_64_RELATIVE64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
172 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE64", FALSE
, MINUS_ONE
,
174 HOWTO(R_X86_64_PC32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
175 bfd_elf_generic_reloc
, "R_X86_64_PC32_BND", FALSE
, 0xffffffff, 0xffffffff,
177 HOWTO(R_X86_64_PLT32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
178 bfd_elf_generic_reloc
, "R_X86_64_PLT32_BND", FALSE
, 0xffffffff, 0xffffffff,
180 HOWTO(R_X86_64_GOTPCRELX
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
181 bfd_elf_generic_reloc
, "R_X86_64_GOTPCRELX", FALSE
, 0xffffffff,
183 HOWTO(R_X86_64_REX_GOTPCRELX
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
184 bfd_elf_generic_reloc
, "R_X86_64_REX_GOTPCRELX", FALSE
, 0xffffffff,
187 /* We have a gap in the reloc numbers here.
188 R_X86_64_standard counts the number up to this point, and
189 R_X86_64_vt_offset is the value to subtract from a reloc type of
190 R_X86_64_GNU_VT* to form an index into this table. */
191 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
192 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
194 /* GNU extension to record C++ vtable hierarchy. */
195 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
196 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
198 /* GNU extension to record C++ vtable member usage. */
199 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
200 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
203 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
204 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
205 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
209 #define IS_X86_64_PCREL_TYPE(TYPE) \
210 ( ((TYPE) == R_X86_64_PC8) \
211 || ((TYPE) == R_X86_64_PC16) \
212 || ((TYPE) == R_X86_64_PC32) \
213 || ((TYPE) == R_X86_64_PC32_BND) \
214 || ((TYPE) == R_X86_64_PC64))
216 /* Map BFD relocs to the x86_64 elf relocs. */
219 bfd_reloc_code_real_type bfd_reloc_val
;
220 unsigned char elf_reloc_val
;
223 static const struct elf_reloc_map x86_64_reloc_map
[] =
225 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
226 { BFD_RELOC_64
, R_X86_64_64
, },
227 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
228 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
229 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
230 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
231 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
232 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
233 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
234 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
235 { BFD_RELOC_32
, R_X86_64_32
, },
236 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
237 { BFD_RELOC_16
, R_X86_64_16
, },
238 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
239 { BFD_RELOC_8
, R_X86_64_8
, },
240 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
241 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
242 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
243 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
244 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
245 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
246 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
247 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
248 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
249 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
250 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
251 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
252 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
253 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
254 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
255 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
256 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
257 { BFD_RELOC_SIZE32
, R_X86_64_SIZE32
, },
258 { BFD_RELOC_SIZE64
, R_X86_64_SIZE64
, },
259 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
260 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
261 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
262 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
263 { BFD_RELOC_X86_64_PC32_BND
, R_X86_64_PC32_BND
, },
264 { BFD_RELOC_X86_64_PLT32_BND
, R_X86_64_PLT32_BND
, },
265 { BFD_RELOC_X86_64_GOTPCRELX
, R_X86_64_GOTPCRELX
, },
266 { BFD_RELOC_X86_64_REX_GOTPCRELX
, R_X86_64_REX_GOTPCRELX
, },
267 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
268 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
271 static reloc_howto_type
*
272 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
276 if (r_type
== (unsigned int) R_X86_64_32
)
281 i
= ARRAY_SIZE (x86_64_elf_howto_table
) - 1;
283 else if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
284 || r_type
>= (unsigned int) R_X86_64_max
)
286 if (r_type
>= (unsigned int) R_X86_64_standard
)
288 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
290 r_type
= R_X86_64_NONE
;
295 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
296 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
297 return &x86_64_elf_howto_table
[i
];
300 /* Given a BFD reloc type, return a HOWTO structure. */
301 static reloc_howto_type
*
302 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
303 bfd_reloc_code_real_type code
)
307 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
310 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
311 return elf_x86_64_rtype_to_howto (abfd
,
312 x86_64_reloc_map
[i
].elf_reloc_val
);
317 static reloc_howto_type
*
318 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
323 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
325 /* Get x32 R_X86_64_32. */
326 reloc_howto_type
*reloc
327 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
328 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
332 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
333 if (x86_64_elf_howto_table
[i
].name
!= NULL
334 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
335 return &x86_64_elf_howto_table
[i
];
340 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
343 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
344 Elf_Internal_Rela
*dst
)
348 r_type
= ELF32_R_TYPE (dst
->r_info
);
349 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
350 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
353 /* Support for core dump NOTE sections. */
355 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
360 switch (note
->descsz
)
365 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
367 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
370 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
378 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
380 elf_tdata (abfd
)->core
->signal
381 = bfd_get_16 (abfd
, note
->descdata
+ 12);
384 elf_tdata (abfd
)->core
->lwpid
385 = bfd_get_32 (abfd
, note
->descdata
+ 32);
394 /* Make a ".reg/999" section. */
395 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
396 size
, note
->descpos
+ offset
);
400 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
402 switch (note
->descsz
)
407 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
408 elf_tdata (abfd
)->core
->pid
409 = bfd_get_32 (abfd
, note
->descdata
+ 12);
410 elf_tdata (abfd
)->core
->program
411 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
412 elf_tdata (abfd
)->core
->command
413 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
416 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
417 elf_tdata (abfd
)->core
->pid
418 = bfd_get_32 (abfd
, note
->descdata
+ 24);
419 elf_tdata (abfd
)->core
->program
420 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
421 elf_tdata (abfd
)->core
->command
422 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
425 /* Note that for some reason, a spurious space is tacked
426 onto the end of the args in some (at least one anyway)
427 implementations, so strip it off if it exists. */
430 char *command
= elf_tdata (abfd
)->core
->command
;
431 int n
= strlen (command
);
433 if (0 < n
&& command
[n
- 1] == ' ')
434 command
[n
- 1] = '\0';
442 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
445 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
447 const char *fname
, *psargs
;
458 va_start (ap
, note_type
);
459 fname
= va_arg (ap
, const char *);
460 psargs
= va_arg (ap
, const char *);
463 if (bed
->s
->elfclass
== ELFCLASS32
)
466 memset (&data
, 0, sizeof (data
));
467 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
468 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
469 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
470 &data
, sizeof (data
));
475 memset (&data
, 0, sizeof (data
));
476 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
477 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
478 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
479 &data
, sizeof (data
));
484 va_start (ap
, note_type
);
485 pid
= va_arg (ap
, long);
486 cursig
= va_arg (ap
, int);
487 gregs
= va_arg (ap
, const void *);
490 if (bed
->s
->elfclass
== ELFCLASS32
)
492 if (bed
->elf_machine_code
== EM_X86_64
)
494 prstatusx32_t prstat
;
495 memset (&prstat
, 0, sizeof (prstat
));
497 prstat
.pr_cursig
= cursig
;
498 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
499 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
500 &prstat
, sizeof (prstat
));
505 memset (&prstat
, 0, sizeof (prstat
));
507 prstat
.pr_cursig
= cursig
;
508 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
509 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
510 &prstat
, sizeof (prstat
));
516 memset (&prstat
, 0, sizeof (prstat
));
518 prstat
.pr_cursig
= cursig
;
519 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
520 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
521 &prstat
, sizeof (prstat
));
528 /* Functions for the x86-64 ELF linker. */
530 /* The name of the dynamic interpreter. This is put in the .interp
533 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
534 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
536 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
537 copying dynamic variables from a shared lib into an app's dynbss
538 section, and instead use a dynamic relocation to point into the
540 #define ELIMINATE_COPY_RELOCS 1
542 /* The size in bytes of an entry in the global offset table. */
544 #define GOT_ENTRY_SIZE 8
546 /* The size in bytes of an entry in the procedure linkage table. */
548 #define PLT_ENTRY_SIZE 16
550 /* The first entry in a procedure linkage table looks like this. See the
551 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
553 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
555 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
556 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
557 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
560 /* Subsequent entries in a procedure linkage table look like this. */
562 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
564 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
565 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
566 0x68, /* pushq immediate */
567 0, 0, 0, 0, /* replaced with index into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
572 /* The first entry in a procedure linkage table with BND relocations
575 static const bfd_byte elf_x86_64_bnd_plt0_entry
[PLT_ENTRY_SIZE
] =
577 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
578 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
579 0x0f, 0x1f, 0 /* nopl (%rax) */
582 /* Subsequent entries for legacy branches in a procedure linkage table
583 with BND relocations look like this. */
585 static const bfd_byte elf_x86_64_legacy_plt_entry
[PLT_ENTRY_SIZE
] =
587 0x68, 0, 0, 0, 0, /* pushq immediate */
588 0xe9, 0, 0, 0, 0, /* jmpq relative */
589 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
592 /* Subsequent entries for branches with BND prefx in a procedure linkage
593 table with BND relocations look like this. */
595 static const bfd_byte elf_x86_64_bnd_plt_entry
[PLT_ENTRY_SIZE
] =
597 0x68, 0, 0, 0, 0, /* pushq immediate */
598 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
599 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
602 /* Entries for legacy branches in the second procedure linkage table
605 static const bfd_byte elf_x86_64_legacy_plt2_entry
[8] =
607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
612 /* Entries for branches with BND prefix in the second procedure linkage
613 table look like this. */
615 static const bfd_byte elf_x86_64_bnd_plt2_entry
[8] =
617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
622 /* .eh_frame covering the .plt section. */
624 static const bfd_byte elf_x86_64_eh_frame_plt
[] =
626 #define PLT_CIE_LENGTH 20
627 #define PLT_FDE_LENGTH 36
628 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
629 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
630 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
631 0, 0, 0, 0, /* CIE ID */
633 'z', 'R', 0, /* Augmentation string */
634 1, /* Code alignment factor */
635 0x78, /* Data alignment factor */
636 16, /* Return address column */
637 1, /* Augmentation size */
638 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
639 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
640 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
641 DW_CFA_nop
, DW_CFA_nop
,
643 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
644 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
645 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
646 0, 0, 0, 0, /* .plt size goes here */
647 0, /* Augmentation size */
648 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
649 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
650 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
651 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
652 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
653 11, /* Block length */
654 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
655 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
656 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
657 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
658 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
661 /* Architecture-specific backend data for x86-64. */
663 struct elf_x86_64_backend_data
665 /* Templates for the initial PLT entry and for subsequent entries. */
666 const bfd_byte
*plt0_entry
;
667 const bfd_byte
*plt_entry
;
668 unsigned int plt_entry_size
; /* Size of each PLT entry. */
670 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
671 unsigned int plt0_got1_offset
;
672 unsigned int plt0_got2_offset
;
674 /* Offset of the end of the PC-relative instruction containing
676 unsigned int plt0_got2_insn_end
;
678 /* Offsets into plt_entry that are to be replaced with... */
679 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
680 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
681 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
683 /* Length of the PC-relative instruction containing plt_got_offset. */
684 unsigned int plt_got_insn_size
;
686 /* Offset of the end of the PC-relative jump to plt0_entry. */
687 unsigned int plt_plt_insn_end
;
689 /* Offset into plt_entry where the initial value of the GOT entry points. */
690 unsigned int plt_lazy_offset
;
692 /* .eh_frame covering the .plt section. */
693 const bfd_byte
*eh_frame_plt
;
694 unsigned int eh_frame_plt_size
;
697 #define get_elf_x86_64_arch_data(bed) \
698 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
700 #define get_elf_x86_64_backend_data(abfd) \
701 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
703 #define GET_PLT_ENTRY_SIZE(abfd) \
704 get_elf_x86_64_backend_data (abfd)->plt_entry_size
706 /* These are the standard parameters. */
707 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed
=
709 elf_x86_64_plt0_entry
, /* plt0_entry */
710 elf_x86_64_plt_entry
, /* plt_entry */
711 sizeof (elf_x86_64_plt_entry
), /* plt_entry_size */
712 2, /* plt0_got1_offset */
713 8, /* plt0_got2_offset */
714 12, /* plt0_got2_insn_end */
715 2, /* plt_got_offset */
716 7, /* plt_reloc_offset */
717 12, /* plt_plt_offset */
718 6, /* plt_got_insn_size */
719 PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
720 6, /* plt_lazy_offset */
721 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
722 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
725 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed
=
727 elf_x86_64_bnd_plt0_entry
, /* plt0_entry */
728 elf_x86_64_bnd_plt_entry
, /* plt_entry */
729 sizeof (elf_x86_64_bnd_plt_entry
), /* plt_entry_size */
730 2, /* plt0_got1_offset */
731 1+8, /* plt0_got2_offset */
732 1+12, /* plt0_got2_insn_end */
733 1+2, /* plt_got_offset */
734 1, /* plt_reloc_offset */
735 7, /* plt_plt_offset */
736 1+6, /* plt_got_insn_size */
737 11, /* plt_plt_insn_end */
738 0, /* plt_lazy_offset */
739 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
740 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
743 #define elf_backend_arch_data &elf_x86_64_arch_bed
745 /* x86-64 ELF linker hash entry. */
747 struct elf_x86_64_link_hash_entry
749 struct elf_link_hash_entry elf
;
751 /* Track dynamic relocs copied for this symbol. */
752 struct elf_dyn_relocs
*dyn_relocs
;
754 #define GOT_UNKNOWN 0
758 #define GOT_TLS_GDESC 4
759 #define GOT_TLS_GD_BOTH_P(type) \
760 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
761 #define GOT_TLS_GD_P(type) \
762 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
763 #define GOT_TLS_GDESC_P(type) \
764 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
765 #define GOT_TLS_GD_ANY_P(type) \
766 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
767 unsigned char tls_type
;
769 /* TRUE if a weak symbol with a real definition needs a copy reloc.
770 When there is a weak symbol with a real definition, the processor
771 independent code will have arranged for us to see the real
772 definition first. We need to copy the needs_copy bit from the
773 real definition and check it when allowing copy reloc in PIE. */
774 unsigned int needs_copy
: 1;
776 /* TRUE if symbol has at least one BND relocation. */
777 unsigned int has_bnd_reloc
: 1;
779 /* Reference count of C/C++ function pointer relocations in read-write
780 section which can be resolved at run-time. */
781 bfd_signed_vma func_pointer_refcount
;
783 /* Information about the GOT PLT entry. Filled when there are both
784 GOT and PLT relocations against the same function. */
785 union gotplt_union plt_got
;
787 /* Information about the second PLT entry. Filled when has_bnd_reloc is
789 union gotplt_union plt_bnd
;
791 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
792 starting at the end of the jump table. */
796 #define elf_x86_64_hash_entry(ent) \
797 ((struct elf_x86_64_link_hash_entry *)(ent))
799 struct elf_x86_64_obj_tdata
801 struct elf_obj_tdata root
;
803 /* tls_type for each local got entry. */
804 char *local_got_tls_type
;
806 /* GOTPLT entries for TLS descriptors. */
807 bfd_vma
*local_tlsdesc_gotent
;
810 #define elf_x86_64_tdata(abfd) \
811 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
813 #define elf_x86_64_local_got_tls_type(abfd) \
814 (elf_x86_64_tdata (abfd)->local_got_tls_type)
816 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
817 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
819 #define is_x86_64_elf(bfd) \
820 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
821 && elf_tdata (bfd) != NULL \
822 && elf_object_id (bfd) == X86_64_ELF_DATA)
825 elf_x86_64_mkobject (bfd
*abfd
)
827 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
831 /* x86-64 ELF linker hash table. */
833 struct elf_x86_64_link_hash_table
835 struct elf_link_hash_table elf
;
837 /* Short-cuts to get to dynamic linker sections. */
840 asection
*plt_eh_frame
;
846 bfd_signed_vma refcount
;
850 /* The amount of space used by the jump slots in the GOT. */
851 bfd_vma sgotplt_jump_table_size
;
853 /* Small local sym cache. */
854 struct sym_cache sym_cache
;
856 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
857 bfd_vma (*r_sym
) (bfd_vma
);
858 unsigned int pointer_r_type
;
859 const char *dynamic_interpreter
;
860 int dynamic_interpreter_size
;
862 /* _TLS_MODULE_BASE_ symbol. */
863 struct bfd_link_hash_entry
*tls_module_base
;
865 /* Used by local STT_GNU_IFUNC symbols. */
866 htab_t loc_hash_table
;
867 void * loc_hash_memory
;
869 /* The offset into splt of the PLT entry for the TLS descriptor
870 resolver. Special values are 0, if not necessary (or not found
871 to be necessary yet), and -1 if needed but not determined
874 /* The offset into sgot of the GOT entry used by the PLT entry
878 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
879 bfd_vma next_jump_slot_index
;
880 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
881 bfd_vma next_irelative_index
;
884 /* Get the x86-64 ELF linker hash table from a link_info structure. */
886 #define elf_x86_64_hash_table(p) \
887 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
888 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
890 #define elf_x86_64_compute_jump_table_size(htab) \
891 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
893 /* Create an entry in an x86-64 ELF linker hash table. */
895 static struct bfd_hash_entry
*
896 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
897 struct bfd_hash_table
*table
,
900 /* Allocate the structure if it has not already been allocated by a
904 entry
= (struct bfd_hash_entry
*)
905 bfd_hash_allocate (table
,
906 sizeof (struct elf_x86_64_link_hash_entry
));
911 /* Call the allocation method of the superclass. */
912 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
915 struct elf_x86_64_link_hash_entry
*eh
;
917 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
918 eh
->dyn_relocs
= NULL
;
919 eh
->tls_type
= GOT_UNKNOWN
;
921 eh
->has_bnd_reloc
= 0;
922 eh
->func_pointer_refcount
= 0;
923 eh
->plt_bnd
.offset
= (bfd_vma
) -1;
924 eh
->plt_got
.offset
= (bfd_vma
) -1;
925 eh
->tlsdesc_got
= (bfd_vma
) -1;
931 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
932 for local symbol so that we can handle local STT_GNU_IFUNC symbols
933 as global symbol. We reuse indx and dynstr_index for local symbol
934 hash since they aren't used by global symbols in this backend. */
937 elf_x86_64_local_htab_hash (const void *ptr
)
939 struct elf_link_hash_entry
*h
940 = (struct elf_link_hash_entry
*) ptr
;
941 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
944 /* Compare local hash entries. */
947 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
949 struct elf_link_hash_entry
*h1
950 = (struct elf_link_hash_entry
*) ptr1
;
951 struct elf_link_hash_entry
*h2
952 = (struct elf_link_hash_entry
*) ptr2
;
954 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
957 /* Find and/or create a hash entry for local symbol. */
959 static struct elf_link_hash_entry
*
960 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
961 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
964 struct elf_x86_64_link_hash_entry e
, *ret
;
965 asection
*sec
= abfd
->sections
;
966 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
967 htab
->r_sym (rel
->r_info
));
970 e
.elf
.indx
= sec
->id
;
971 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
972 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
973 create
? INSERT
: NO_INSERT
);
980 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
984 ret
= (struct elf_x86_64_link_hash_entry
*)
985 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
986 sizeof (struct elf_x86_64_link_hash_entry
));
989 memset (ret
, 0, sizeof (*ret
));
990 ret
->elf
.indx
= sec
->id
;
991 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
992 ret
->elf
.dynindx
= -1;
993 ret
->func_pointer_refcount
= 0;
994 ret
->plt_got
.offset
= (bfd_vma
) -1;
1000 /* Destroy an X86-64 ELF linker hash table. */
1003 elf_x86_64_link_hash_table_free (bfd
*obfd
)
1005 struct elf_x86_64_link_hash_table
*htab
1006 = (struct elf_x86_64_link_hash_table
*) obfd
->link
.hash
;
1008 if (htab
->loc_hash_table
)
1009 htab_delete (htab
->loc_hash_table
);
1010 if (htab
->loc_hash_memory
)
1011 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
1012 _bfd_elf_link_hash_table_free (obfd
);
1015 /* Create an X86-64 ELF linker hash table. */
1017 static struct bfd_link_hash_table
*
1018 elf_x86_64_link_hash_table_create (bfd
*abfd
)
1020 struct elf_x86_64_link_hash_table
*ret
;
1021 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
1023 ret
= (struct elf_x86_64_link_hash_table
*) bfd_zmalloc (amt
);
1027 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1028 elf_x86_64_link_hash_newfunc
,
1029 sizeof (struct elf_x86_64_link_hash_entry
),
1036 if (ABI_64_P (abfd
))
1038 ret
->r_info
= elf64_r_info
;
1039 ret
->r_sym
= elf64_r_sym
;
1040 ret
->pointer_r_type
= R_X86_64_64
;
1041 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
1042 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
1046 ret
->r_info
= elf32_r_info
;
1047 ret
->r_sym
= elf32_r_sym
;
1048 ret
->pointer_r_type
= R_X86_64_32
;
1049 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
1050 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
1053 ret
->loc_hash_table
= htab_try_create (1024,
1054 elf_x86_64_local_htab_hash
,
1055 elf_x86_64_local_htab_eq
,
1057 ret
->loc_hash_memory
= objalloc_create ();
1058 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1060 elf_x86_64_link_hash_table_free (abfd
);
1063 ret
->elf
.root
.hash_table_free
= elf_x86_64_link_hash_table_free
;
1065 return &ret
->elf
.root
;
1068 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1069 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1073 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
1074 struct bfd_link_info
*info
)
1076 struct elf_x86_64_link_hash_table
*htab
;
1078 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1081 htab
= elf_x86_64_hash_table (info
);
1085 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
1089 if (bfd_link_executable (info
))
1091 /* Always allow copy relocs for building executables. */
1092 asection
*s
= bfd_get_linker_section (dynobj
, ".rela.bss");
1095 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
1096 s
= bfd_make_section_anyway_with_flags (dynobj
,
1098 (bed
->dynamic_sec_flags
1101 || ! bfd_set_section_alignment (dynobj
, s
,
1102 bed
->s
->log_file_align
))
1108 if (!info
->no_ld_generated_unwind_info
1109 && htab
->plt_eh_frame
== NULL
1110 && htab
->elf
.splt
!= NULL
)
1112 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1113 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1114 | SEC_LINKER_CREATED
);
1116 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1117 if (htab
->plt_eh_frame
== NULL
1118 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
1124 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1127 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1128 struct elf_link_hash_entry
*dir
,
1129 struct elf_link_hash_entry
*ind
)
1131 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1133 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1134 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1136 if (!edir
->has_bnd_reloc
)
1137 edir
->has_bnd_reloc
= eind
->has_bnd_reloc
;
1139 if (eind
->dyn_relocs
!= NULL
)
1141 if (edir
->dyn_relocs
!= NULL
)
1143 struct elf_dyn_relocs
**pp
;
1144 struct elf_dyn_relocs
*p
;
1146 /* Add reloc counts against the indirect sym to the direct sym
1147 list. Merge any entries against the same section. */
1148 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1150 struct elf_dyn_relocs
*q
;
1152 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1153 if (q
->sec
== p
->sec
)
1155 q
->pc_count
+= p
->pc_count
;
1156 q
->count
+= p
->count
;
1163 *pp
= edir
->dyn_relocs
;
1166 edir
->dyn_relocs
= eind
->dyn_relocs
;
1167 eind
->dyn_relocs
= NULL
;
1170 if (ind
->root
.type
== bfd_link_hash_indirect
1171 && dir
->got
.refcount
<= 0)
1173 edir
->tls_type
= eind
->tls_type
;
1174 eind
->tls_type
= GOT_UNKNOWN
;
1177 if (ELIMINATE_COPY_RELOCS
1178 && ind
->root
.type
!= bfd_link_hash_indirect
1179 && dir
->dynamic_adjusted
)
1181 /* If called to transfer flags for a weakdef during processing
1182 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1183 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1184 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1185 dir
->ref_regular
|= ind
->ref_regular
;
1186 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1187 dir
->needs_plt
|= ind
->needs_plt
;
1188 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1192 if (eind
->func_pointer_refcount
> 0)
1194 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1195 eind
->func_pointer_refcount
= 0;
1198 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1203 elf64_x86_64_elf_object_p (bfd
*abfd
)
1205 /* Set the right machine number for an x86-64 elf64 file. */
1206 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1211 elf32_x86_64_elf_object_p (bfd
*abfd
)
1213 /* Set the right machine number for an x86-64 elf32 file. */
1214 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1218 /* Return TRUE if the TLS access code sequence support transition
1222 elf_x86_64_check_tls_transition (bfd
*abfd
,
1223 struct bfd_link_info
*info
,
1226 Elf_Internal_Shdr
*symtab_hdr
,
1227 struct elf_link_hash_entry
**sym_hashes
,
1228 unsigned int r_type
,
1229 const Elf_Internal_Rela
*rel
,
1230 const Elf_Internal_Rela
*relend
)
1233 unsigned long r_symndx
;
1234 bfd_boolean largepic
= FALSE
;
1235 struct elf_link_hash_entry
*h
;
1237 struct elf_x86_64_link_hash_table
*htab
;
1239 /* Get the section contents. */
1240 if (contents
== NULL
)
1242 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1243 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1246 /* FIXME: How to better handle error condition? */
1247 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1250 /* Cache the section contents for elf_link_input_bfd. */
1251 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1255 htab
= elf_x86_64_hash_table (info
);
1256 offset
= rel
->r_offset
;
1259 case R_X86_64_TLSGD
:
1260 case R_X86_64_TLSLD
:
1261 if ((rel
+ 1) >= relend
)
1264 if (r_type
== R_X86_64_TLSGD
)
1266 /* Check transition from GD access model. For 64bit, only
1267 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1268 .word 0x6666; rex64; call __tls_get_addr
1269 can transit to different access model. For 32bit, only
1270 leaq foo@tlsgd(%rip), %rdi
1271 .word 0x6666; rex64; call __tls_get_addr
1272 can transit to different access model. For largepic
1274 leaq foo@tlsgd(%rip), %rdi
1275 movabsq $__tls_get_addr@pltoff, %rax
1279 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1280 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1282 if ((offset
+ 12) > sec
->size
)
1285 if (memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1287 if (!ABI_64_P (abfd
)
1288 || (offset
+ 19) > sec
->size
1290 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0
1291 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1292 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1297 else if (ABI_64_P (abfd
))
1300 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1306 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1312 /* Check transition from LD access model. Only
1313 leaq foo@tlsld(%rip), %rdi;
1315 can transit to different access model. For largepic
1317 leaq foo@tlsld(%rip), %rdi
1318 movabsq $__tls_get_addr@pltoff, %rax
1322 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1324 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1327 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1330 if (0xe8 != *(contents
+ offset
+ 4))
1332 if (!ABI_64_P (abfd
)
1333 || (offset
+ 19) > sec
->size
1334 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1335 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1342 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1343 if (r_symndx
< symtab_hdr
->sh_info
)
1346 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1347 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1348 may be versioned. */
1350 && h
->root
.root
.string
!= NULL
1352 ? ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
1353 : (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1354 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
))
1355 && (strncmp (h
->root
.root
.string
,
1356 "__tls_get_addr", 14) == 0));
1358 case R_X86_64_GOTTPOFF
:
1359 /* Check transition from IE access model:
1360 mov foo@gottpoff(%rip), %reg
1361 add foo@gottpoff(%rip), %reg
1364 /* Check REX prefix first. */
1365 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1367 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1368 if (val
!= 0x48 && val
!= 0x4c)
1370 /* X32 may have 0x44 REX prefix or no REX prefix. */
1371 if (ABI_64_P (abfd
))
1377 /* X32 may not have any REX prefix. */
1378 if (ABI_64_P (abfd
))
1380 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1384 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1385 if (val
!= 0x8b && val
!= 0x03)
1388 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1389 return (val
& 0xc7) == 5;
1391 case R_X86_64_GOTPC32_TLSDESC
:
1392 /* Check transition from GDesc access model:
1393 leaq x@tlsdesc(%rip), %rax
1395 Make sure it's a leaq adding rip to a 32-bit offset
1396 into any register, although it's probably almost always
1399 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1402 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1403 if ((val
& 0xfb) != 0x48)
1406 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1409 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1410 return (val
& 0xc7) == 0x05;
1412 case R_X86_64_TLSDESC_CALL
:
1413 /* Check transition from GDesc access model:
1414 call *x@tlsdesc(%rax)
1416 if (offset
+ 2 <= sec
->size
)
1418 /* Make sure that it's a call *x@tlsdesc(%rax). */
1419 static const unsigned char call
[] = { 0xff, 0x10 };
1420 return memcmp (contents
+ offset
, call
, 2) == 0;
1430 /* Return TRUE if the TLS access transition is OK or no transition
1431 will be performed. Update R_TYPE if there is a transition. */
1434 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1435 asection
*sec
, bfd_byte
*contents
,
1436 Elf_Internal_Shdr
*symtab_hdr
,
1437 struct elf_link_hash_entry
**sym_hashes
,
1438 unsigned int *r_type
, int tls_type
,
1439 const Elf_Internal_Rela
*rel
,
1440 const Elf_Internal_Rela
*relend
,
1441 struct elf_link_hash_entry
*h
,
1442 unsigned long r_symndx
)
1444 unsigned int from_type
= *r_type
;
1445 unsigned int to_type
= from_type
;
1446 bfd_boolean check
= TRUE
;
1448 /* Skip TLS transition for functions. */
1450 && (h
->type
== STT_FUNC
1451 || h
->type
== STT_GNU_IFUNC
))
1456 case R_X86_64_TLSGD
:
1457 case R_X86_64_GOTPC32_TLSDESC
:
1458 case R_X86_64_TLSDESC_CALL
:
1459 case R_X86_64_GOTTPOFF
:
1460 if (bfd_link_executable (info
))
1463 to_type
= R_X86_64_TPOFF32
;
1465 to_type
= R_X86_64_GOTTPOFF
;
1468 /* When we are called from elf_x86_64_relocate_section,
1469 CONTENTS isn't NULL and there may be additional transitions
1470 based on TLS_TYPE. */
1471 if (contents
!= NULL
)
1473 unsigned int new_to_type
= to_type
;
1475 if (bfd_link_executable (info
)
1478 && tls_type
== GOT_TLS_IE
)
1479 new_to_type
= R_X86_64_TPOFF32
;
1481 if (to_type
== R_X86_64_TLSGD
1482 || to_type
== R_X86_64_GOTPC32_TLSDESC
1483 || to_type
== R_X86_64_TLSDESC_CALL
)
1485 if (tls_type
== GOT_TLS_IE
)
1486 new_to_type
= R_X86_64_GOTTPOFF
;
1489 /* We checked the transition before when we were called from
1490 elf_x86_64_check_relocs. We only want to check the new
1491 transition which hasn't been checked before. */
1492 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1493 to_type
= new_to_type
;
1498 case R_X86_64_TLSLD
:
1499 if (bfd_link_executable (info
))
1500 to_type
= R_X86_64_TPOFF32
;
1507 /* Return TRUE if there is no transition. */
1508 if (from_type
== to_type
)
1511 /* Check if the transition can be performed. */
1513 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1514 symtab_hdr
, sym_hashes
,
1515 from_type
, rel
, relend
))
1517 reloc_howto_type
*from
, *to
;
1520 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1521 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1524 name
= h
->root
.root
.string
;
1527 struct elf_x86_64_link_hash_table
*htab
;
1529 htab
= elf_x86_64_hash_table (info
);
1534 Elf_Internal_Sym
*isym
;
1536 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1538 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1542 (*_bfd_error_handler
)
1543 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1544 "in section `%A' failed"),
1545 abfd
, sec
, from
->name
, to
->name
, name
,
1546 (unsigned long) rel
->r_offset
);
1547 bfd_set_error (bfd_error_bad_value
);
1555 /* Rename some of the generic section flags to better document how they
1557 #define need_convert_load sec_flg0
1559 /* Look through the relocs for a section during the first phase, and
1560 calculate needed space in the global offset table, procedure
1561 linkage table, and dynamic reloc sections. */
1564 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1566 const Elf_Internal_Rela
*relocs
)
1568 struct elf_x86_64_link_hash_table
*htab
;
1569 Elf_Internal_Shdr
*symtab_hdr
;
1570 struct elf_link_hash_entry
**sym_hashes
;
1571 const Elf_Internal_Rela
*rel
;
1572 const Elf_Internal_Rela
*rel_end
;
1574 bfd_boolean use_plt_got
;
1576 if (bfd_link_relocatable (info
))
1579 BFD_ASSERT (is_x86_64_elf (abfd
));
1581 htab
= elf_x86_64_hash_table (info
);
1585 use_plt_got
= get_elf_x86_64_backend_data (abfd
) == &elf_x86_64_arch_bed
;
1587 symtab_hdr
= &elf_symtab_hdr (abfd
);
1588 sym_hashes
= elf_sym_hashes (abfd
);
1592 rel_end
= relocs
+ sec
->reloc_count
;
1593 for (rel
= relocs
; rel
< rel_end
; rel
++)
1595 unsigned int r_type
;
1596 unsigned long r_symndx
;
1597 struct elf_link_hash_entry
*h
;
1598 Elf_Internal_Sym
*isym
;
1600 bfd_boolean size_reloc
;
1602 r_symndx
= htab
->r_sym (rel
->r_info
);
1603 r_type
= ELF32_R_TYPE (rel
->r_info
);
1605 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1607 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1612 if (r_symndx
< symtab_hdr
->sh_info
)
1614 /* A local symbol. */
1615 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1620 /* Check relocation against local STT_GNU_IFUNC symbol. */
1621 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1623 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1628 /* Fake a STT_GNU_IFUNC symbol. */
1629 h
->type
= STT_GNU_IFUNC
;
1632 h
->forced_local
= 1;
1633 h
->root
.type
= bfd_link_hash_defined
;
1641 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1642 while (h
->root
.type
== bfd_link_hash_indirect
1643 || h
->root
.type
== bfd_link_hash_warning
)
1644 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1647 /* Check invalid x32 relocations. */
1648 if (!ABI_64_P (abfd
))
1654 case R_X86_64_DTPOFF64
:
1655 case R_X86_64_TPOFF64
:
1657 case R_X86_64_GOTOFF64
:
1658 case R_X86_64_GOT64
:
1659 case R_X86_64_GOTPCREL64
:
1660 case R_X86_64_GOTPC64
:
1661 case R_X86_64_GOTPLT64
:
1662 case R_X86_64_PLTOFF64
:
1665 name
= h
->root
.root
.string
;
1667 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1669 (*_bfd_error_handler
)
1670 (_("%B: relocation %s against symbol `%s' isn't "
1671 "supported in x32 mode"), abfd
,
1672 x86_64_elf_howto_table
[r_type
].name
, name
);
1673 bfd_set_error (bfd_error_bad_value
);
1681 /* Create the ifunc sections for static executables. If we
1682 never see an indirect function symbol nor we are building
1683 a static executable, those sections will be empty and
1684 won't appear in output. */
1690 case R_X86_64_PC32_BND
:
1691 case R_X86_64_PLT32_BND
:
1693 case R_X86_64_PLT32
:
1696 /* MPX PLT is supported only if elf_x86_64_arch_bed
1697 is used in 64-bit mode. */
1700 && (get_elf_x86_64_backend_data (abfd
)
1701 == &elf_x86_64_arch_bed
))
1703 elf_x86_64_hash_entry (h
)->has_bnd_reloc
= 1;
1705 /* Create the second PLT for Intel MPX support. */
1706 if (htab
->plt_bnd
== NULL
)
1708 unsigned int plt_bnd_align
;
1709 const struct elf_backend_data
*bed
;
1711 bed
= get_elf_backend_data (info
->output_bfd
);
1712 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
) == 8
1713 && (sizeof (elf_x86_64_bnd_plt2_entry
)
1714 == sizeof (elf_x86_64_legacy_plt2_entry
)));
1717 if (htab
->elf
.dynobj
== NULL
)
1718 htab
->elf
.dynobj
= abfd
;
1720 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1722 (bed
->dynamic_sec_flags
1727 if (htab
->plt_bnd
== NULL
1728 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
1737 case R_X86_64_GOTPCREL
:
1738 case R_X86_64_GOTPCRELX
:
1739 case R_X86_64_REX_GOTPCRELX
:
1740 case R_X86_64_GOTPCREL64
:
1741 if (htab
->elf
.dynobj
== NULL
)
1742 htab
->elf
.dynobj
= abfd
;
1743 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1748 /* It is referenced by a non-shared object. */
1750 h
->root
.non_ir_ref
= 1;
1752 if (h
->type
== STT_GNU_IFUNC
)
1753 elf_tdata (info
->output_bfd
)->has_gnu_symbols
1754 |= elf_gnu_symbol_ifunc
;
1757 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1758 symtab_hdr
, sym_hashes
,
1759 &r_type
, GOT_UNKNOWN
,
1760 rel
, rel_end
, h
, r_symndx
))
1765 case R_X86_64_TLSLD
:
1766 htab
->tls_ld_got
.refcount
+= 1;
1769 case R_X86_64_TPOFF32
:
1770 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
1773 name
= h
->root
.root
.string
;
1775 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1777 (*_bfd_error_handler
)
1778 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1780 x86_64_elf_howto_table
[r_type
].name
, name
);
1781 bfd_set_error (bfd_error_bad_value
);
1786 case R_X86_64_GOTTPOFF
:
1787 if (!bfd_link_executable (info
))
1788 info
->flags
|= DF_STATIC_TLS
;
1791 case R_X86_64_GOT32
:
1792 case R_X86_64_GOTPCREL
:
1793 case R_X86_64_GOTPCRELX
:
1794 case R_X86_64_REX_GOTPCRELX
:
1795 case R_X86_64_TLSGD
:
1796 case R_X86_64_GOT64
:
1797 case R_X86_64_GOTPCREL64
:
1798 case R_X86_64_GOTPLT64
:
1799 case R_X86_64_GOTPC32_TLSDESC
:
1800 case R_X86_64_TLSDESC_CALL
:
1801 /* This symbol requires a global offset table entry. */
1803 int tls_type
, old_tls_type
;
1807 default: tls_type
= GOT_NORMAL
; break;
1808 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1809 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1810 case R_X86_64_GOTPC32_TLSDESC
:
1811 case R_X86_64_TLSDESC_CALL
:
1812 tls_type
= GOT_TLS_GDESC
; break;
1817 h
->got
.refcount
+= 1;
1818 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1822 bfd_signed_vma
*local_got_refcounts
;
1824 /* This is a global offset table entry for a local symbol. */
1825 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1826 if (local_got_refcounts
== NULL
)
1830 size
= symtab_hdr
->sh_info
;
1831 size
*= sizeof (bfd_signed_vma
)
1832 + sizeof (bfd_vma
) + sizeof (char);
1833 local_got_refcounts
= ((bfd_signed_vma
*)
1834 bfd_zalloc (abfd
, size
));
1835 if (local_got_refcounts
== NULL
)
1837 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1838 elf_x86_64_local_tlsdesc_gotent (abfd
)
1839 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1840 elf_x86_64_local_got_tls_type (abfd
)
1841 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1843 local_got_refcounts
[r_symndx
] += 1;
1845 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1848 /* If a TLS symbol is accessed using IE at least once,
1849 there is no point to use dynamic model for it. */
1850 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1851 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1852 || tls_type
!= GOT_TLS_IE
))
1854 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1855 tls_type
= old_tls_type
;
1856 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1857 && GOT_TLS_GD_ANY_P (tls_type
))
1858 tls_type
|= old_tls_type
;
1862 name
= h
->root
.root
.string
;
1864 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1866 (*_bfd_error_handler
)
1867 (_("%B: '%s' accessed both as normal and thread local symbol"),
1869 bfd_set_error (bfd_error_bad_value
);
1874 if (old_tls_type
!= tls_type
)
1877 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1879 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1884 case R_X86_64_GOTOFF64
:
1885 case R_X86_64_GOTPC32
:
1886 case R_X86_64_GOTPC64
:
1888 if (htab
->elf
.sgot
== NULL
)
1890 if (htab
->elf
.dynobj
== NULL
)
1891 htab
->elf
.dynobj
= abfd
;
1892 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1898 case R_X86_64_PLT32
:
1899 case R_X86_64_PLT32_BND
:
1900 /* This symbol requires a procedure linkage table entry. We
1901 actually build the entry in adjust_dynamic_symbol,
1902 because this might be a case of linking PIC code which is
1903 never referenced by a dynamic object, in which case we
1904 don't need to generate a procedure linkage table entry
1907 /* If this is a local symbol, we resolve it directly without
1908 creating a procedure linkage table entry. */
1913 h
->plt
.refcount
+= 1;
1916 case R_X86_64_PLTOFF64
:
1917 /* This tries to form the 'address' of a function relative
1918 to GOT. For global symbols we need a PLT entry. */
1922 h
->plt
.refcount
+= 1;
1926 case R_X86_64_SIZE32
:
1927 case R_X86_64_SIZE64
:
1932 if (!ABI_64_P (abfd
))
1937 /* Let's help debug shared library creation. These relocs
1938 cannot be used in shared libs. Don't error out for
1939 sections we don't care about, such as debug sections or
1940 non-constant sections. */
1941 if (bfd_link_pic (info
)
1942 && (sec
->flags
& SEC_ALLOC
) != 0
1943 && (sec
->flags
& SEC_READONLY
) != 0)
1946 name
= h
->root
.root
.string
;
1948 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1949 (*_bfd_error_handler
)
1950 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1951 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1952 bfd_set_error (bfd_error_bad_value
);
1960 case R_X86_64_PC32_BND
:
1964 if (h
!= NULL
&& bfd_link_executable (info
))
1966 /* If this reloc is in a read-only section, we might
1967 need a copy reloc. We can't check reliably at this
1968 stage whether the section is read-only, as input
1969 sections have not yet been mapped to output sections.
1970 Tentatively set the flag for now, and correct in
1971 adjust_dynamic_symbol. */
1974 /* We may need a .plt entry if the function this reloc
1975 refers to is in a shared lib. */
1976 h
->plt
.refcount
+= 1;
1977 if (r_type
== R_X86_64_PC32
)
1979 /* Since something like ".long foo - ." may be used
1980 as pointer, make sure that PLT is used if foo is
1981 a function defined in a shared library. */
1982 if ((sec
->flags
& SEC_CODE
) == 0)
1983 h
->pointer_equality_needed
= 1;
1985 else if (r_type
!= R_X86_64_PC32_BND
1986 && r_type
!= R_X86_64_PC64
)
1988 h
->pointer_equality_needed
= 1;
1989 /* At run-time, R_X86_64_64 can be resolved for both
1990 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
1991 can only be resolved for x32. */
1992 if ((sec
->flags
& SEC_READONLY
) == 0
1993 && (r_type
== R_X86_64_64
1994 || (!ABI_64_P (abfd
)
1995 && (r_type
== R_X86_64_32
1996 || r_type
== R_X86_64_32S
))))
1998 struct elf_x86_64_link_hash_entry
*eh
1999 = (struct elf_x86_64_link_hash_entry
*) h
;
2000 eh
->func_pointer_refcount
+= 1;
2007 /* If we are creating a shared library, and this is a reloc
2008 against a global symbol, or a non PC relative reloc
2009 against a local symbol, then we need to copy the reloc
2010 into the shared library. However, if we are linking with
2011 -Bsymbolic, we do not need to copy a reloc against a
2012 global symbol which is defined in an object we are
2013 including in the link (i.e., DEF_REGULAR is set). At
2014 this point we have not seen all the input files, so it is
2015 possible that DEF_REGULAR is not set now but will be set
2016 later (it is never cleared). In case of a weak definition,
2017 DEF_REGULAR may be cleared later by a strong definition in
2018 a shared library. We account for that possibility below by
2019 storing information in the relocs_copied field of the hash
2020 table entry. A similar situation occurs when creating
2021 shared libraries and symbol visibility changes render the
2024 If on the other hand, we are creating an executable, we
2025 may need to keep relocations for symbols satisfied by a
2026 dynamic library if we manage to avoid copy relocs for the
2028 if ((bfd_link_pic (info
)
2029 && (sec
->flags
& SEC_ALLOC
) != 0
2030 && (! IS_X86_64_PCREL_TYPE (r_type
)
2032 && (! SYMBOLIC_BIND (info
, h
)
2033 || h
->root
.type
== bfd_link_hash_defweak
2034 || !h
->def_regular
))))
2035 || (ELIMINATE_COPY_RELOCS
2036 && !bfd_link_pic (info
)
2037 && (sec
->flags
& SEC_ALLOC
) != 0
2039 && (h
->root
.type
== bfd_link_hash_defweak
2040 || !h
->def_regular
)))
2042 struct elf_dyn_relocs
*p
;
2043 struct elf_dyn_relocs
**head
;
2045 /* We must copy these reloc types into the output file.
2046 Create a reloc section in dynobj and make room for
2050 if (htab
->elf
.dynobj
== NULL
)
2051 htab
->elf
.dynobj
= abfd
;
2053 sreloc
= _bfd_elf_make_dynamic_reloc_section
2054 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
2055 abfd
, /*rela?*/ TRUE
);
2061 /* If this is a global symbol, we count the number of
2062 relocations we need for this symbol. */
2065 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
2069 /* Track dynamic relocs needed for local syms too.
2070 We really need local syms available to do this
2075 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2080 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2084 /* Beware of type punned pointers vs strict aliasing
2086 vpp
= &(elf_section_data (s
)->local_dynrel
);
2087 head
= (struct elf_dyn_relocs
**)vpp
;
2091 if (p
== NULL
|| p
->sec
!= sec
)
2093 bfd_size_type amt
= sizeof *p
;
2095 p
= ((struct elf_dyn_relocs
*)
2096 bfd_alloc (htab
->elf
.dynobj
, amt
));
2107 /* Count size relocation as PC-relative relocation. */
2108 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2113 /* This relocation describes the C++ object vtable hierarchy.
2114 Reconstruct it for later use during GC. */
2115 case R_X86_64_GNU_VTINHERIT
:
2116 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2120 /* This relocation describes which C++ vtable entries are actually
2121 used. Record for later use during GC. */
2122 case R_X86_64_GNU_VTENTRY
:
2123 BFD_ASSERT (h
!= NULL
);
2125 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2135 && h
->plt
.refcount
> 0
2136 && (((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2137 || h
->got
.refcount
> 0)
2138 && htab
->plt_got
== NULL
)
2140 /* Create the GOT procedure linkage table. */
2141 unsigned int plt_got_align
;
2142 const struct elf_backend_data
*bed
;
2144 bed
= get_elf_backend_data (info
->output_bfd
);
2145 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry
) == 8
2146 && (sizeof (elf_x86_64_bnd_plt2_entry
)
2147 == sizeof (elf_x86_64_legacy_plt2_entry
)));
2150 if (htab
->elf
.dynobj
== NULL
)
2151 htab
->elf
.dynobj
= abfd
;
2153 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2155 (bed
->dynamic_sec_flags
2160 if (htab
->plt_got
== NULL
2161 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2167 if ((r_type
== R_X86_64_GOTPCREL
2168 || r_type
== R_X86_64_GOTPCRELX
2169 || r_type
== R_X86_64_REX_GOTPCRELX
)
2170 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2171 sec
->need_convert_load
= 1;
2177 /* Return the section that should be marked against GC for a given
2181 elf_x86_64_gc_mark_hook (asection
*sec
,
2182 struct bfd_link_info
*info
,
2183 Elf_Internal_Rela
*rel
,
2184 struct elf_link_hash_entry
*h
,
2185 Elf_Internal_Sym
*sym
)
2188 switch (ELF32_R_TYPE (rel
->r_info
))
2190 case R_X86_64_GNU_VTINHERIT
:
2191 case R_X86_64_GNU_VTENTRY
:
2195 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2198 /* Update the got entry reference counts for the section being removed. */
2201 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
2203 const Elf_Internal_Rela
*relocs
)
2205 struct elf_x86_64_link_hash_table
*htab
;
2206 Elf_Internal_Shdr
*symtab_hdr
;
2207 struct elf_link_hash_entry
**sym_hashes
;
2208 bfd_signed_vma
*local_got_refcounts
;
2209 const Elf_Internal_Rela
*rel
, *relend
;
2211 if (bfd_link_relocatable (info
))
2214 htab
= elf_x86_64_hash_table (info
);
2218 elf_section_data (sec
)->local_dynrel
= NULL
;
2220 symtab_hdr
= &elf_symtab_hdr (abfd
);
2221 sym_hashes
= elf_sym_hashes (abfd
);
2222 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2224 htab
= elf_x86_64_hash_table (info
);
2225 relend
= relocs
+ sec
->reloc_count
;
2226 for (rel
= relocs
; rel
< relend
; rel
++)
2228 unsigned long r_symndx
;
2229 unsigned int r_type
;
2230 struct elf_link_hash_entry
*h
= NULL
;
2231 bfd_boolean pointer_reloc
;
2233 r_symndx
= htab
->r_sym (rel
->r_info
);
2234 if (r_symndx
>= symtab_hdr
->sh_info
)
2236 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2237 while (h
->root
.type
== bfd_link_hash_indirect
2238 || h
->root
.type
== bfd_link_hash_warning
)
2239 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2243 /* A local symbol. */
2244 Elf_Internal_Sym
*isym
;
2246 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2249 /* Check relocation against local STT_GNU_IFUNC symbol. */
2251 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2253 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2261 struct elf_x86_64_link_hash_entry
*eh
;
2262 struct elf_dyn_relocs
**pp
;
2263 struct elf_dyn_relocs
*p
;
2265 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2267 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2270 /* Everything must go for SEC. */
2276 r_type
= ELF32_R_TYPE (rel
->r_info
);
2277 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2278 symtab_hdr
, sym_hashes
,
2279 &r_type
, GOT_UNKNOWN
,
2280 rel
, relend
, h
, r_symndx
))
2283 pointer_reloc
= FALSE
;
2286 case R_X86_64_TLSLD
:
2287 if (htab
->tls_ld_got
.refcount
> 0)
2288 htab
->tls_ld_got
.refcount
-= 1;
2291 case R_X86_64_TLSGD
:
2292 case R_X86_64_GOTPC32_TLSDESC
:
2293 case R_X86_64_TLSDESC_CALL
:
2294 case R_X86_64_GOTTPOFF
:
2295 case R_X86_64_GOT32
:
2296 case R_X86_64_GOTPCREL
:
2297 case R_X86_64_GOTPCRELX
:
2298 case R_X86_64_REX_GOTPCRELX
:
2299 case R_X86_64_GOT64
:
2300 case R_X86_64_GOTPCREL64
:
2301 case R_X86_64_GOTPLT64
:
2304 if (h
->got
.refcount
> 0)
2305 h
->got
.refcount
-= 1;
2306 if (h
->type
== STT_GNU_IFUNC
)
2308 if (h
->plt
.refcount
> 0)
2309 h
->plt
.refcount
-= 1;
2312 else if (local_got_refcounts
!= NULL
)
2314 if (local_got_refcounts
[r_symndx
] > 0)
2315 local_got_refcounts
[r_symndx
] -= 1;
2321 pointer_reloc
= !ABI_64_P (abfd
);
2325 pointer_reloc
= TRUE
;
2331 case R_X86_64_PC32_BND
:
2333 case R_X86_64_SIZE32
:
2334 case R_X86_64_SIZE64
:
2336 if (bfd_link_pic (info
)
2337 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2341 case R_X86_64_PLT32
:
2342 case R_X86_64_PLT32_BND
:
2343 case R_X86_64_PLTOFF64
:
2346 if (h
->plt
.refcount
> 0)
2347 h
->plt
.refcount
-= 1;
2348 if (pointer_reloc
&& (sec
->flags
& SEC_READONLY
) == 0)
2350 struct elf_x86_64_link_hash_entry
*eh
2351 = (struct elf_x86_64_link_hash_entry
*) h
;
2352 if (eh
->func_pointer_refcount
> 0)
2353 eh
->func_pointer_refcount
-= 1;
2366 /* Adjust a symbol defined by a dynamic object and referenced by a
2367 regular object. The current definition is in some section of the
2368 dynamic object, but we're not including those sections. We have to
2369 change the definition to something the rest of the link can
2373 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2374 struct elf_link_hash_entry
*h
)
2376 struct elf_x86_64_link_hash_table
*htab
;
2378 struct elf_x86_64_link_hash_entry
*eh
;
2379 struct elf_dyn_relocs
*p
;
2381 /* STT_GNU_IFUNC symbol must go through PLT. */
2382 if (h
->type
== STT_GNU_IFUNC
)
2384 /* All local STT_GNU_IFUNC references must be treate as local
2385 calls via local PLT. */
2387 && SYMBOL_CALLS_LOCAL (info
, h
))
2389 bfd_size_type pc_count
= 0, count
= 0;
2390 struct elf_dyn_relocs
**pp
;
2392 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2393 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2395 pc_count
+= p
->pc_count
;
2396 p
->count
-= p
->pc_count
;
2405 if (pc_count
|| count
)
2409 if (h
->plt
.refcount
<= 0)
2410 h
->plt
.refcount
= 1;
2412 h
->plt
.refcount
+= 1;
2416 if (h
->plt
.refcount
<= 0)
2418 h
->plt
.offset
= (bfd_vma
) -1;
2424 /* If this is a function, put it in the procedure linkage table. We
2425 will fill in the contents of the procedure linkage table later,
2426 when we know the address of the .got section. */
2427 if (h
->type
== STT_FUNC
2430 if (h
->plt
.refcount
<= 0
2431 || SYMBOL_CALLS_LOCAL (info
, h
)
2432 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2433 && h
->root
.type
== bfd_link_hash_undefweak
))
2435 /* This case can occur if we saw a PLT32 reloc in an input
2436 file, but the symbol was never referred to by a dynamic
2437 object, or if all references were garbage collected. In
2438 such a case, we don't actually need to build a procedure
2439 linkage table, and we can just do a PC32 reloc instead. */
2440 h
->plt
.offset
= (bfd_vma
) -1;
2447 /* It's possible that we incorrectly decided a .plt reloc was
2448 needed for an R_X86_64_PC32 reloc to a non-function sym in
2449 check_relocs. We can't decide accurately between function and
2450 non-function syms in check-relocs; Objects loaded later in
2451 the link may change h->type. So fix it now. */
2452 h
->plt
.offset
= (bfd_vma
) -1;
2454 /* If this is a weak symbol, and there is a real definition, the
2455 processor independent code will have arranged for us to see the
2456 real definition first, and we can just use the same value. */
2457 if (h
->u
.weakdef
!= NULL
)
2459 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2460 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2461 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2462 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2463 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2465 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2466 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2467 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
2472 /* This is a reference to a symbol defined by a dynamic object which
2473 is not a function. */
2475 /* If we are creating a shared library, we must presume that the
2476 only references to the symbol are via the global offset table.
2477 For such cases we need not do anything here; the relocations will
2478 be handled correctly by relocate_section. */
2479 if (!bfd_link_executable (info
))
2482 /* If there are no references to this symbol that do not use the
2483 GOT, we don't need to generate a copy reloc. */
2484 if (!h
->non_got_ref
)
2487 /* If -z nocopyreloc was given, we won't generate them either. */
2488 if (info
->nocopyreloc
)
2494 if (ELIMINATE_COPY_RELOCS
)
2496 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2497 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2499 s
= p
->sec
->output_section
;
2500 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2504 /* If we didn't find any dynamic relocs in read-only sections, then
2505 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2513 /* We must allocate the symbol in our .dynbss section, which will
2514 become part of the .bss section of the executable. There will be
2515 an entry for this symbol in the .dynsym section. The dynamic
2516 object will contain position independent code, so all references
2517 from the dynamic object to this symbol will go through the global
2518 offset table. The dynamic linker will use the .dynsym entry to
2519 determine the address it must put in the global offset table, so
2520 both the dynamic object and the regular object will refer to the
2521 same memory location for the variable. */
2523 htab
= elf_x86_64_hash_table (info
);
2527 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2528 to copy the initial value out of the dynamic object and into the
2529 runtime process image. */
2530 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2532 const struct elf_backend_data
*bed
;
2533 bed
= get_elf_backend_data (info
->output_bfd
);
2534 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2540 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
2543 /* Allocate space in .plt, .got and associated reloc sections for
2547 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2549 struct bfd_link_info
*info
;
2550 struct elf_x86_64_link_hash_table
*htab
;
2551 struct elf_x86_64_link_hash_entry
*eh
;
2552 struct elf_dyn_relocs
*p
;
2553 const struct elf_backend_data
*bed
;
2554 unsigned int plt_entry_size
;
2556 if (h
->root
.type
== bfd_link_hash_indirect
)
2559 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2561 info
= (struct bfd_link_info
*) inf
;
2562 htab
= elf_x86_64_hash_table (info
);
2565 bed
= get_elf_backend_data (info
->output_bfd
);
2566 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2568 /* We can't use the GOT PLT if pointer equality is needed since
2569 finish_dynamic_symbol won't clear symbol value and the dynamic
2570 linker won't update the GOT slot. We will get into an infinite
2571 loop at run-time. */
2572 if (htab
->plt_got
!= NULL
2573 && h
->type
!= STT_GNU_IFUNC
2574 && !h
->pointer_equality_needed
2575 && h
->plt
.refcount
> 0
2576 && h
->got
.refcount
> 0)
2578 /* Don't use the regular PLT if there are both GOT and GOTPLT
2580 h
->plt
.offset
= (bfd_vma
) -1;
2582 /* Use the GOT PLT. */
2583 eh
->plt_got
.refcount
= 1;
2586 /* Clear the reference count of function pointer relocations if
2587 symbol isn't a normal function. */
2588 if (h
->type
!= STT_FUNC
)
2589 eh
->func_pointer_refcount
= 0;
2591 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2592 here if it is defined and referenced in a non-shared object. */
2593 if (h
->type
== STT_GNU_IFUNC
2596 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2602 asection
*s
= htab
->plt_bnd
;
2603 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
2605 /* Use the .plt.bnd section if it is created. */
2606 eh
->plt_bnd
.offset
= s
->size
;
2608 /* Make room for this entry in the .plt.bnd section. */
2609 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2617 /* Don't create the PLT entry if there are only function pointer
2618 relocations which can be resolved at run-time. */
2619 else if (htab
->elf
.dynamic_sections_created
2620 && (h
->plt
.refcount
> eh
->func_pointer_refcount
2621 || eh
->plt_got
.refcount
> 0))
2623 bfd_boolean use_plt_got
;
2625 /* Clear the reference count of function pointer relocations
2627 eh
->func_pointer_refcount
= 0;
2629 if ((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2631 /* Don't use the regular PLT for DF_BIND_NOW. */
2632 h
->plt
.offset
= (bfd_vma
) -1;
2634 /* Use the GOT PLT. */
2635 h
->got
.refcount
= 1;
2636 eh
->plt_got
.refcount
= 1;
2639 use_plt_got
= eh
->plt_got
.refcount
> 0;
2641 /* Make sure this symbol is output as a dynamic symbol.
2642 Undefined weak syms won't yet be marked as dynamic. */
2643 if (h
->dynindx
== -1
2644 && !h
->forced_local
)
2646 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2650 if (bfd_link_pic (info
)
2651 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2653 asection
*s
= htab
->elf
.splt
;
2654 asection
*bnd_s
= htab
->plt_bnd
;
2655 asection
*got_s
= htab
->plt_got
;
2657 /* If this is the first .plt entry, make room for the special
2658 first entry. The .plt section is used by prelink to undo
2659 prelinking for dynamic relocations. */
2661 s
->size
= plt_entry_size
;
2664 eh
->plt_got
.offset
= got_s
->size
;
2667 h
->plt
.offset
= s
->size
;
2669 eh
->plt_bnd
.offset
= bnd_s
->size
;
2672 /* If this symbol is not defined in a regular file, and we are
2673 not generating a shared library, then set the symbol to this
2674 location in the .plt. This is required to make function
2675 pointers compare as equal between the normal executable and
2676 the shared library. */
2677 if (! bfd_link_pic (info
)
2682 /* We need to make a call to the entry of the GOT PLT
2683 instead of regular PLT entry. */
2684 h
->root
.u
.def
.section
= got_s
;
2685 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
2691 /* We need to make a call to the entry of the second
2692 PLT instead of regular PLT entry. */
2693 h
->root
.u
.def
.section
= bnd_s
;
2694 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
2698 h
->root
.u
.def
.section
= s
;
2699 h
->root
.u
.def
.value
= h
->plt
.offset
;
2704 /* Make room for this entry. */
2706 got_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2709 s
->size
+= plt_entry_size
;
2711 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2713 /* We also need to make an entry in the .got.plt section,
2714 which will be placed in the .got section by the linker
2716 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2718 /* We also need to make an entry in the .rela.plt
2720 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2721 htab
->elf
.srelplt
->reloc_count
++;
2726 eh
->plt_got
.offset
= (bfd_vma
) -1;
2727 h
->plt
.offset
= (bfd_vma
) -1;
2733 eh
->plt_got
.offset
= (bfd_vma
) -1;
2734 h
->plt
.offset
= (bfd_vma
) -1;
2738 eh
->tlsdesc_got
= (bfd_vma
) -1;
2740 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2741 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2742 if (h
->got
.refcount
> 0
2743 && bfd_link_executable (info
)
2745 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2747 h
->got
.offset
= (bfd_vma
) -1;
2749 else if (h
->got
.refcount
> 0)
2753 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2755 /* Make sure this symbol is output as a dynamic symbol.
2756 Undefined weak syms won't yet be marked as dynamic. */
2757 if (h
->dynindx
== -1
2758 && !h
->forced_local
)
2760 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2764 if (GOT_TLS_GDESC_P (tls_type
))
2766 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2767 - elf_x86_64_compute_jump_table_size (htab
);
2768 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2769 h
->got
.offset
= (bfd_vma
) -2;
2771 if (! GOT_TLS_GDESC_P (tls_type
)
2772 || GOT_TLS_GD_P (tls_type
))
2775 h
->got
.offset
= s
->size
;
2776 s
->size
+= GOT_ENTRY_SIZE
;
2777 if (GOT_TLS_GD_P (tls_type
))
2778 s
->size
+= GOT_ENTRY_SIZE
;
2780 dyn
= htab
->elf
.dynamic_sections_created
;
2781 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2783 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2784 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2785 || tls_type
== GOT_TLS_IE
)
2786 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2787 else if (GOT_TLS_GD_P (tls_type
))
2788 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2789 else if (! GOT_TLS_GDESC_P (tls_type
)
2790 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2791 || h
->root
.type
!= bfd_link_hash_undefweak
)
2792 && (bfd_link_pic (info
)
2793 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2794 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2795 if (GOT_TLS_GDESC_P (tls_type
))
2797 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2798 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2802 h
->got
.offset
= (bfd_vma
) -1;
2804 if (eh
->dyn_relocs
== NULL
)
2807 /* In the shared -Bsymbolic case, discard space allocated for
2808 dynamic pc-relative relocs against symbols which turn out to be
2809 defined in regular objects. For the normal shared case, discard
2810 space for pc-relative relocs that have become local due to symbol
2811 visibility changes. */
2813 if (bfd_link_pic (info
))
2815 /* Relocs that use pc_count are those that appear on a call
2816 insn, or certain REL relocs that can generated via assembly.
2817 We want calls to protected symbols to resolve directly to the
2818 function rather than going via the plt. If people want
2819 function pointer comparisons to work as expected then they
2820 should avoid writing weird assembly. */
2821 if (SYMBOL_CALLS_LOCAL (info
, h
))
2823 struct elf_dyn_relocs
**pp
;
2825 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2827 p
->count
-= p
->pc_count
;
2836 /* Also discard relocs on undefined weak syms with non-default
2838 if (eh
->dyn_relocs
!= NULL
)
2840 if (h
->root
.type
== bfd_link_hash_undefweak
)
2842 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2843 eh
->dyn_relocs
= NULL
;
2845 /* Make sure undefined weak symbols are output as a dynamic
2847 else if (h
->dynindx
== -1
2848 && ! h
->forced_local
2849 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2852 /* For PIE, discard space for pc-relative relocs against
2853 symbols which turn out to need copy relocs. */
2854 else if (bfd_link_executable (info
)
2855 && (h
->needs_copy
|| eh
->needs_copy
)
2859 struct elf_dyn_relocs
**pp
;
2861 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2863 if (p
->pc_count
!= 0)
2871 else if (ELIMINATE_COPY_RELOCS
)
2873 /* For the non-shared case, discard space for relocs against
2874 symbols which turn out to need copy relocs or are not
2875 dynamic. Keep dynamic relocations for run-time function
2876 pointer initialization. */
2878 if ((!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
2881 || (htab
->elf
.dynamic_sections_created
2882 && (h
->root
.type
== bfd_link_hash_undefweak
2883 || h
->root
.type
== bfd_link_hash_undefined
))))
2885 /* Make sure this symbol is output as a dynamic symbol.
2886 Undefined weak syms won't yet be marked as dynamic. */
2887 if (h
->dynindx
== -1
2888 && ! h
->forced_local
2889 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2892 /* If that succeeded, we know we'll be keeping all the
2894 if (h
->dynindx
!= -1)
2898 eh
->dyn_relocs
= NULL
;
2899 eh
->func_pointer_refcount
= 0;
2904 /* Finally, allocate space. */
2905 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2909 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2911 BFD_ASSERT (sreloc
!= NULL
);
2913 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2919 /* Allocate space in .plt, .got and associated reloc sections for
2920 local dynamic relocs. */
2923 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2925 struct elf_link_hash_entry
*h
2926 = (struct elf_link_hash_entry
*) *slot
;
2928 if (h
->type
!= STT_GNU_IFUNC
2932 || h
->root
.type
!= bfd_link_hash_defined
)
2935 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2938 /* Find any dynamic relocs that apply to read-only sections. */
2941 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2944 struct elf_x86_64_link_hash_entry
*eh
;
2945 struct elf_dyn_relocs
*p
;
2947 /* Skip local IFUNC symbols. */
2948 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2951 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2952 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2954 asection
*s
= p
->sec
->output_section
;
2956 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2958 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2960 info
->flags
|= DF_TEXTREL
;
2962 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
2963 || info
->error_textrel
)
2964 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2965 p
->sec
->owner
, h
->root
.root
.string
,
2968 /* Not an error, just cut short the traversal. */
2975 /* With the local symbol, foo, we convert
2976 mov foo@GOTPCREL(%rip), %reg
2980 call/jmp *foo@GOTPCREL(%rip)
2982 nop call foo/jmp foo nop
2983 When PIC is false, convert
2984 test %reg, foo@GOTPCREL(%rip)
2988 binop foo@GOTPCREL(%rip), %reg
2991 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2995 elf_x86_64_convert_load (bfd
*abfd
, asection
*sec
,
2996 struct bfd_link_info
*link_info
)
2998 Elf_Internal_Shdr
*symtab_hdr
;
2999 Elf_Internal_Rela
*internal_relocs
;
3000 Elf_Internal_Rela
*irel
, *irelend
;
3002 struct elf_x86_64_link_hash_table
*htab
;
3003 bfd_boolean changed_contents
;
3004 bfd_boolean changed_relocs
;
3005 bfd_signed_vma
*local_got_refcounts
;
3006 bfd_vma maxpagesize
;
3008 /* Don't even try to convert non-ELF outputs. */
3009 if (!is_elf_hash_table (link_info
->hash
))
3012 /* Nothing to do if there is no need or no output. */
3013 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
3014 || sec
->need_convert_load
== 0
3015 || bfd_is_abs_section (sec
->output_section
))
3018 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3020 /* Load the relocations for this section. */
3021 internal_relocs
= (_bfd_elf_link_read_relocs
3022 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
3023 link_info
->keep_memory
));
3024 if (internal_relocs
== NULL
)
3027 htab
= elf_x86_64_hash_table (link_info
);
3028 changed_contents
= FALSE
;
3029 changed_relocs
= FALSE
;
3030 local_got_refcounts
= elf_local_got_refcounts (abfd
);
3031 maxpagesize
= get_elf_backend_data (abfd
)->maxpagesize
;
3033 /* Get the section contents. */
3034 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
3035 contents
= elf_section_data (sec
)->this_hdr
.contents
;
3038 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
3042 irelend
= internal_relocs
+ sec
->reloc_count
;
3043 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
3045 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
3046 unsigned int r_symndx
= htab
->r_sym (irel
->r_info
);
3048 struct elf_link_hash_entry
*h
;
3052 bfd_signed_vma raddend
;
3053 unsigned int opcode
;
3056 if (r_type
!= R_X86_64_GOTPCREL
3057 && r_type
!= R_X86_64_GOTPCRELX
3058 && r_type
!= R_X86_64_REX_GOTPCRELX
)
3061 roff
= irel
->r_offset
;
3062 if (roff
< (r_type
== R_X86_64_REX_GOTPCRELX
? 3 : 2))
3065 raddend
= irel
->r_addend
;
3066 /* Addend for 32-bit PC-relative relocation must be -4. */
3070 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
3072 /* It is OK to convert mov to lea. */
3075 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
3076 for mov call, jmp or one of adc, add, and, cmp, or, sbb,
3077 sub, test, xor instructions. */
3078 if (r_type
!= R_X86_64_GOTPCRELX
3079 && r_type
!= R_X86_64_REX_GOTPCRELX
)
3082 /* It is OK to convert indirect branch to direct branch. */
3085 /* It is OK to convert adc, add, and, cmp, or, sbb, sub,
3086 test, xor only when PIC is false. */
3087 if (bfd_link_pic (link_info
))
3092 /* Get the symbol referred to by the reloc. */
3093 if (r_symndx
< symtab_hdr
->sh_info
)
3095 Elf_Internal_Sym
*isym
;
3097 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
3100 symtype
= ELF_ST_TYPE (isym
->st_info
);
3102 /* STT_GNU_IFUNC must keep GOTPCREL relocations and skip
3103 relocation against undefined symbols. */
3104 if (symtype
== STT_GNU_IFUNC
|| isym
->st_shndx
== SHN_UNDEF
)
3107 if (isym
->st_shndx
== SHN_ABS
)
3108 tsec
= bfd_abs_section_ptr
;
3109 else if (isym
->st_shndx
== SHN_COMMON
)
3110 tsec
= bfd_com_section_ptr
;
3111 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
3112 tsec
= &_bfd_elf_large_com_section
;
3114 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3117 toff
= isym
->st_value
;
3121 indx
= r_symndx
- symtab_hdr
->sh_info
;
3122 h
= elf_sym_hashes (abfd
)[indx
];
3123 BFD_ASSERT (h
!= NULL
);
3125 while (h
->root
.type
== bfd_link_hash_indirect
3126 || h
->root
.type
== bfd_link_hash_warning
)
3127 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3129 /* STT_GNU_IFUNC must keep GOTPCREL relocations. We also
3130 avoid optimizing GOTPCREL relocations againt _DYNAMIC
3131 since ld.so may use its link-time address. */
3133 || h
->root
.type
== bfd_link_hash_defined
3134 || h
->root
.type
== bfd_link_hash_defweak
)
3135 && h
->type
!= STT_GNU_IFUNC
3136 && h
!= htab
->elf
.hdynamic
3137 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3139 /* bfd_link_hash_new or bfd_link_hash_undefined is
3140 set by an assignment in a linker script in
3141 bfd_elf_record_link_assignment. FIXME: If we
3142 ever get a linker error due relocation overflow,
3143 we will skip this optimization. */
3145 && (h
->root
.type
== bfd_link_hash_new
3146 || h
->root
.type
== bfd_link_hash_undefined
))
3148 tsec
= h
->root
.u
.def
.section
;
3149 toff
= h
->root
.u
.def
.value
;
3156 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3158 /* At this stage in linking, no SEC_MERGE symbol has been
3159 adjusted, so all references to such symbols need to be
3160 passed through _bfd_merged_section_offset. (Later, in
3161 relocate_section, all SEC_MERGE symbols *except* for
3162 section symbols have been adjusted.)
3164 gas may reduce relocations against symbols in SEC_MERGE
3165 sections to a relocation against the section symbol when
3166 the original addend was zero. When the reloc is against
3167 a section symbol we should include the addend in the
3168 offset passed to _bfd_merged_section_offset, since the
3169 location of interest is the original symbol. On the
3170 other hand, an access to "sym+addend" where "sym" is not
3171 a section symbol should not include the addend; Such an
3172 access is presumed to be an offset from "sym"; The
3173 location of interest is just "sym". */
3174 if (symtype
== STT_SECTION
)
3177 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3178 elf_section_data (tsec
)->sec_info
,
3181 if (symtype
!= STT_SECTION
)
3187 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3188 if (tsec
->output_section
== sec
->output_section
)
3190 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3195 bfd_signed_vma distance
;
3197 /* At this point, we don't know the load addresses of TSEC
3198 section nor SEC section. We estimate the distrance between
3199 SEC and TSEC. We store the estimated distances in the
3200 compressed_size field of the output section, which is only
3201 used to decompress the compressed input section. */
3202 if (sec
->output_section
->compressed_size
== 0)
3205 bfd_size_type size
= 0;
3206 for (asect
= link_info
->output_bfd
->sections
;
3208 asect
= asect
->next
)
3211 for (i
= asect
->map_head
.s
;
3215 size
= align_power (size
, i
->alignment_power
);
3218 asect
->compressed_size
= size
;
3222 /* Don't convert GOTPCREL relocations if TSEC isn't placed
3224 distance
= (tsec
->output_section
->compressed_size
3225 - sec
->output_section
->compressed_size
);
3229 /* Take PT_GNU_RELRO segment into account by adding
3231 if ((toff
+ distance
+ maxpagesize
- roff
+ 0x80000000)
3239 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
3244 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
3246 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3249 /* Convert to "jmp foo nop". */
3252 nop_offset
= irel
->r_offset
+ 3;
3253 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3254 irel
->r_offset
-= 1;
3255 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3259 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3262 nop
= link_info
->call_nop_byte
;
3263 if (link_info
->call_nop_as_suffix
)
3265 nop_offset
= irel
->r_offset
+ 3;
3266 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
3267 irel
->r_offset
-= 1;
3268 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
3271 nop_offset
= irel
->r_offset
- 2;
3273 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
3274 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
3275 r_type
= R_X86_64_PC32
;
3281 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
3282 "lea foo(%rip), %reg". */
3284 r_type
= R_X86_64_PC32
;
3288 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
3291 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
3292 "test $foo, %reg". */
3293 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
3298 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
3299 "binop $foo, %reg". */
3300 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
3303 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
3305 if (r_type
== R_X86_64_REX_GOTPCRELX
)
3307 /* Move the R bit to the B bit in REX byte. */
3308 unsigned int rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
3309 rex
= (rex
& ~REX_R
) | (rex
& REX_R
) >> 2;
3310 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
3312 /* No addend for R_X86_64_32S relocation. */
3314 r_type
= R_X86_64_32S
;
3317 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
3320 irel
->r_info
= htab
->r_info (r_symndx
, r_type
);
3321 changed_contents
= TRUE
;
3322 changed_relocs
= TRUE
;
3326 if (h
->got
.refcount
> 0)
3327 h
->got
.refcount
-= 1;
3331 if (local_got_refcounts
!= NULL
3332 && local_got_refcounts
[r_symndx
] > 0)
3333 local_got_refcounts
[r_symndx
] -= 1;
3337 if (contents
!= NULL
3338 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3340 if (!changed_contents
&& !link_info
->keep_memory
)
3344 /* Cache the section contents for elf_link_input_bfd. */
3345 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3349 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3351 if (!changed_relocs
)
3352 free (internal_relocs
);
3354 elf_section_data (sec
)->relocs
= internal_relocs
;
3360 if (contents
!= NULL
3361 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3363 if (internal_relocs
!= NULL
3364 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3365 free (internal_relocs
);
3369 /* Set the sizes of the dynamic sections. */
3372 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3373 struct bfd_link_info
*info
)
3375 struct elf_x86_64_link_hash_table
*htab
;
3380 const struct elf_backend_data
*bed
;
3382 htab
= elf_x86_64_hash_table (info
);
3385 bed
= get_elf_backend_data (output_bfd
);
3387 dynobj
= htab
->elf
.dynobj
;
3391 if (htab
->elf
.dynamic_sections_created
)
3393 /* Set the contents of the .interp section to the interpreter. */
3394 if (bfd_link_executable (info
) && !info
->nointerp
)
3396 s
= bfd_get_linker_section (dynobj
, ".interp");
3399 s
->size
= htab
->dynamic_interpreter_size
;
3400 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3404 /* Set up .got offsets for local syms, and space for local dynamic
3406 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3408 bfd_signed_vma
*local_got
;
3409 bfd_signed_vma
*end_local_got
;
3410 char *local_tls_type
;
3411 bfd_vma
*local_tlsdesc_gotent
;
3412 bfd_size_type locsymcount
;
3413 Elf_Internal_Shdr
*symtab_hdr
;
3416 if (! is_x86_64_elf (ibfd
))
3419 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3421 struct elf_dyn_relocs
*p
;
3423 if (!elf_x86_64_convert_load (ibfd
, s
, info
))
3426 for (p
= (struct elf_dyn_relocs
*)
3427 (elf_section_data (s
)->local_dynrel
);
3431 if (!bfd_is_abs_section (p
->sec
)
3432 && bfd_is_abs_section (p
->sec
->output_section
))
3434 /* Input section has been discarded, either because
3435 it is a copy of a linkonce section or due to
3436 linker script /DISCARD/, so we'll be discarding
3439 else if (p
->count
!= 0)
3441 srel
= elf_section_data (p
->sec
)->sreloc
;
3442 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3443 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3444 && (info
->flags
& DF_TEXTREL
) == 0)
3446 info
->flags
|= DF_TEXTREL
;
3447 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3448 || info
->error_textrel
)
3449 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3450 p
->sec
->owner
, p
->sec
);
3456 local_got
= elf_local_got_refcounts (ibfd
);
3460 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3461 locsymcount
= symtab_hdr
->sh_info
;
3462 end_local_got
= local_got
+ locsymcount
;
3463 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3464 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3466 srel
= htab
->elf
.srelgot
;
3467 for (; local_got
< end_local_got
;
3468 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3470 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3473 if (GOT_TLS_GDESC_P (*local_tls_type
))
3475 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3476 - elf_x86_64_compute_jump_table_size (htab
);
3477 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3478 *local_got
= (bfd_vma
) -2;
3480 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3481 || GOT_TLS_GD_P (*local_tls_type
))
3483 *local_got
= s
->size
;
3484 s
->size
+= GOT_ENTRY_SIZE
;
3485 if (GOT_TLS_GD_P (*local_tls_type
))
3486 s
->size
+= GOT_ENTRY_SIZE
;
3488 if (bfd_link_pic (info
)
3489 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3490 || *local_tls_type
== GOT_TLS_IE
)
3492 if (GOT_TLS_GDESC_P (*local_tls_type
))
3494 htab
->elf
.srelplt
->size
3495 += bed
->s
->sizeof_rela
;
3496 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3498 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3499 || GOT_TLS_GD_P (*local_tls_type
))
3500 srel
->size
+= bed
->s
->sizeof_rela
;
3504 *local_got
= (bfd_vma
) -1;
3508 if (htab
->tls_ld_got
.refcount
> 0)
3510 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3512 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3513 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3514 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3517 htab
->tls_ld_got
.offset
= -1;
3519 /* Allocate global sym .plt and .got entries, and space for global
3520 sym dynamic relocs. */
3521 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3524 /* Allocate .plt and .got entries, and space for local symbols. */
3525 htab_traverse (htab
->loc_hash_table
,
3526 elf_x86_64_allocate_local_dynrelocs
,
3529 /* For every jump slot reserved in the sgotplt, reloc_count is
3530 incremented. However, when we reserve space for TLS descriptors,
3531 it's not incremented, so in order to compute the space reserved
3532 for them, it suffices to multiply the reloc count by the jump
3535 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3536 so that R_X86_64_IRELATIVE entries come last. */
3537 if (htab
->elf
.srelplt
)
3539 htab
->sgotplt_jump_table_size
3540 = elf_x86_64_compute_jump_table_size (htab
);
3541 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3543 else if (htab
->elf
.irelplt
)
3544 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3546 if (htab
->tlsdesc_plt
)
3548 /* If we're not using lazy TLS relocations, don't generate the
3549 PLT and GOT entries they require. */
3550 if ((info
->flags
& DF_BIND_NOW
))
3551 htab
->tlsdesc_plt
= 0;
3554 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3555 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3556 /* Reserve room for the initial entry.
3557 FIXME: we could probably do away with it in this case. */
3558 if (htab
->elf
.splt
->size
== 0)
3559 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3560 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3561 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3565 if (htab
->elf
.sgotplt
)
3567 /* Don't allocate .got.plt section if there are no GOT nor PLT
3568 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3569 if ((htab
->elf
.hgot
== NULL
3570 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3571 && (htab
->elf
.sgotplt
->size
3572 == get_elf_backend_data (output_bfd
)->got_header_size
)
3573 && (htab
->elf
.splt
== NULL
3574 || htab
->elf
.splt
->size
== 0)
3575 && (htab
->elf
.sgot
== NULL
3576 || htab
->elf
.sgot
->size
== 0)
3577 && (htab
->elf
.iplt
== NULL
3578 || htab
->elf
.iplt
->size
== 0)
3579 && (htab
->elf
.igotplt
== NULL
3580 || htab
->elf
.igotplt
->size
== 0))
3581 htab
->elf
.sgotplt
->size
= 0;
3584 if (htab
->plt_eh_frame
!= NULL
3585 && htab
->elf
.splt
!= NULL
3586 && htab
->elf
.splt
->size
!= 0
3587 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3588 && _bfd_elf_eh_frame_present (info
))
3590 const struct elf_x86_64_backend_data
*arch_data
3591 = get_elf_x86_64_arch_data (bed
);
3592 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3595 /* We now have determined the sizes of the various dynamic sections.
3596 Allocate memory for them. */
3598 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3600 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3603 if (s
== htab
->elf
.splt
3604 || s
== htab
->elf
.sgot
3605 || s
== htab
->elf
.sgotplt
3606 || s
== htab
->elf
.iplt
3607 || s
== htab
->elf
.igotplt
3608 || s
== htab
->plt_bnd
3609 || s
== htab
->plt_got
3610 || s
== htab
->plt_eh_frame
3611 || s
== htab
->sdynbss
)
3613 /* Strip this section if we don't need it; see the
3616 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3618 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3621 /* We use the reloc_count field as a counter if we need
3622 to copy relocs into the output file. */
3623 if (s
!= htab
->elf
.srelplt
)
3628 /* It's not one of our sections, so don't allocate space. */
3634 /* If we don't need this section, strip it from the
3635 output file. This is mostly to handle .rela.bss and
3636 .rela.plt. We must create both sections in
3637 create_dynamic_sections, because they must be created
3638 before the linker maps input sections to output
3639 sections. The linker does that before
3640 adjust_dynamic_symbol is called, and it is that
3641 function which decides whether anything needs to go
3642 into these sections. */
3644 s
->flags
|= SEC_EXCLUDE
;
3648 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3651 /* Allocate memory for the section contents. We use bfd_zalloc
3652 here in case unused entries are not reclaimed before the
3653 section's contents are written out. This should not happen,
3654 but this way if it does, we get a R_X86_64_NONE reloc instead
3656 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3657 if (s
->contents
== NULL
)
3661 if (htab
->plt_eh_frame
!= NULL
3662 && htab
->plt_eh_frame
->contents
!= NULL
)
3664 const struct elf_x86_64_backend_data
*arch_data
3665 = get_elf_x86_64_arch_data (bed
);
3667 memcpy (htab
->plt_eh_frame
->contents
,
3668 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3669 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3670 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3673 if (htab
->elf
.dynamic_sections_created
)
3675 /* Add some entries to the .dynamic section. We fill in the
3676 values later, in elf_x86_64_finish_dynamic_sections, but we
3677 must add the entries now so that we get the correct size for
3678 the .dynamic section. The DT_DEBUG entry is filled in by the
3679 dynamic linker and used by the debugger. */
3680 #define add_dynamic_entry(TAG, VAL) \
3681 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3683 if (bfd_link_executable (info
))
3685 if (!add_dynamic_entry (DT_DEBUG
, 0))
3689 if (htab
->elf
.splt
->size
!= 0)
3691 /* DT_PLTGOT is used by prelink even if there is no PLT
3693 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3696 if (htab
->elf
.srelplt
->size
!= 0)
3698 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3699 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3700 || !add_dynamic_entry (DT_JMPREL
, 0))
3704 if (htab
->tlsdesc_plt
3705 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3706 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3712 if (!add_dynamic_entry (DT_RELA
, 0)
3713 || !add_dynamic_entry (DT_RELASZ
, 0)
3714 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3717 /* If any dynamic relocs apply to a read-only section,
3718 then we need a DT_TEXTREL entry. */
3719 if ((info
->flags
& DF_TEXTREL
) == 0)
3720 elf_link_hash_traverse (&htab
->elf
,
3721 elf_x86_64_readonly_dynrelocs
,
3724 if ((info
->flags
& DF_TEXTREL
) != 0)
3726 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3727 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3729 info
->callbacks
->einfo
3730 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3731 bfd_set_error (bfd_error_bad_value
);
3735 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3740 #undef add_dynamic_entry
3746 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3747 struct bfd_link_info
*info
)
3749 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3753 struct elf_link_hash_entry
*tlsbase
;
3755 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3756 "_TLS_MODULE_BASE_",
3757 FALSE
, FALSE
, FALSE
);
3759 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3761 struct elf_x86_64_link_hash_table
*htab
;
3762 struct bfd_link_hash_entry
*bh
= NULL
;
3763 const struct elf_backend_data
*bed
3764 = get_elf_backend_data (output_bfd
);
3766 htab
= elf_x86_64_hash_table (info
);
3770 if (!(_bfd_generic_link_add_one_symbol
3771 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3772 tls_sec
, 0, NULL
, FALSE
,
3773 bed
->collect
, &bh
)))
3776 htab
->tls_module_base
= bh
;
3778 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3779 tlsbase
->def_regular
= 1;
3780 tlsbase
->other
= STV_HIDDEN
;
3781 tlsbase
->root
.linker_def
= 1;
3782 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3789 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3790 executables. Rather than setting it to the beginning of the TLS
3791 section, we have to set it to the end. This function may be called
3792 multiple times, it is idempotent. */
3795 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3797 struct elf_x86_64_link_hash_table
*htab
;
3798 struct bfd_link_hash_entry
*base
;
3800 if (!bfd_link_executable (info
))
3803 htab
= elf_x86_64_hash_table (info
);
3807 base
= htab
->tls_module_base
;
3811 base
->u
.def
.value
= htab
->elf
.tls_size
;
3814 /* Return the base VMA address which should be subtracted from real addresses
3815 when resolving @dtpoff relocation.
3816 This is PT_TLS segment p_vaddr. */
3819 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3821 /* If tls_sec is NULL, we should have signalled an error already. */
3822 if (elf_hash_table (info
)->tls_sec
== NULL
)
3824 return elf_hash_table (info
)->tls_sec
->vma
;
3827 /* Return the relocation value for @tpoff relocation
3828 if STT_TLS virtual address is ADDRESS. */
3831 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3833 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3834 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3835 bfd_vma static_tls_size
;
3837 /* If tls_segment is NULL, we should have signalled an error already. */
3838 if (htab
->tls_sec
== NULL
)
3841 /* Consider special static TLS alignment requirements. */
3842 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3843 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3846 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3850 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3852 /* Opcode Instruction
3855 0x0f 0x8x conditional jump */
3857 && (contents
[offset
- 1] == 0xe8
3858 || contents
[offset
- 1] == 0xe9))
3860 && contents
[offset
- 2] == 0x0f
3861 && (contents
[offset
- 1] & 0xf0) == 0x80));
3864 /* Relocate an x86_64 ELF section. */
3867 elf_x86_64_relocate_section (bfd
*output_bfd
,
3868 struct bfd_link_info
*info
,
3870 asection
*input_section
,
3872 Elf_Internal_Rela
*relocs
,
3873 Elf_Internal_Sym
*local_syms
,
3874 asection
**local_sections
)
3876 struct elf_x86_64_link_hash_table
*htab
;
3877 Elf_Internal_Shdr
*symtab_hdr
;
3878 struct elf_link_hash_entry
**sym_hashes
;
3879 bfd_vma
*local_got_offsets
;
3880 bfd_vma
*local_tlsdesc_gotents
;
3881 Elf_Internal_Rela
*rel
;
3882 Elf_Internal_Rela
*wrel
;
3883 Elf_Internal_Rela
*relend
;
3884 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3886 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3888 htab
= elf_x86_64_hash_table (info
);
3891 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3892 sym_hashes
= elf_sym_hashes (input_bfd
);
3893 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3894 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3896 elf_x86_64_set_tls_module_base (info
);
3898 rel
= wrel
= relocs
;
3899 relend
= relocs
+ input_section
->reloc_count
;
3900 for (; rel
< relend
; wrel
++, rel
++)
3902 unsigned int r_type
;
3903 reloc_howto_type
*howto
;
3904 unsigned long r_symndx
;
3905 struct elf_link_hash_entry
*h
;
3906 struct elf_x86_64_link_hash_entry
*eh
;
3907 Elf_Internal_Sym
*sym
;
3909 bfd_vma off
, offplt
, plt_offset
;
3911 bfd_boolean unresolved_reloc
;
3912 bfd_reloc_status_type r
;
3914 asection
*base_got
, *resolved_plt
;
3917 r_type
= ELF32_R_TYPE (rel
->r_info
);
3918 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3919 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3926 if (r_type
>= (int) R_X86_64_standard
)
3928 (*_bfd_error_handler
)
3929 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3930 input_bfd
, input_section
, r_type
);
3931 bfd_set_error (bfd_error_bad_value
);
3935 if (r_type
!= (int) R_X86_64_32
3936 || ABI_64_P (output_bfd
))
3937 howto
= x86_64_elf_howto_table
+ r_type
;
3939 howto
= (x86_64_elf_howto_table
3940 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3941 r_symndx
= htab
->r_sym (rel
->r_info
);
3945 unresolved_reloc
= FALSE
;
3946 if (r_symndx
< symtab_hdr
->sh_info
)
3948 sym
= local_syms
+ r_symndx
;
3949 sec
= local_sections
[r_symndx
];
3951 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3953 st_size
= sym
->st_size
;
3955 /* Relocate against local STT_GNU_IFUNC symbol. */
3956 if (!bfd_link_relocatable (info
)
3957 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3959 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3964 /* Set STT_GNU_IFUNC symbol value. */
3965 h
->root
.u
.def
.value
= sym
->st_value
;
3966 h
->root
.u
.def
.section
= sec
;
3971 bfd_boolean warned ATTRIBUTE_UNUSED
;
3972 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3974 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3975 r_symndx
, symtab_hdr
, sym_hashes
,
3977 unresolved_reloc
, warned
, ignored
);
3981 if (sec
!= NULL
&& discarded_section (sec
))
3983 _bfd_clear_contents (howto
, input_bfd
, input_section
,
3984 contents
+ rel
->r_offset
);
3985 wrel
->r_offset
= rel
->r_offset
;
3989 /* For ld -r, remove relocations in debug sections against
3990 sections defined in discarded sections. Not done for
3991 eh_frame editing code expects to be present. */
3992 if (bfd_link_relocatable (info
)
3993 && (input_section
->flags
& SEC_DEBUGGING
))
3999 if (bfd_link_relocatable (info
))
4006 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
4008 if (r_type
== R_X86_64_64
)
4010 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4011 zero-extend it to 64bit if addend is zero. */
4012 r_type
= R_X86_64_32
;
4013 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4015 else if (r_type
== R_X86_64_SIZE64
)
4017 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4018 zero-extend it to 64bit if addend is zero. */
4019 r_type
= R_X86_64_SIZE32
;
4020 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
4024 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
4026 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4027 it here if it is defined in a non-shared object. */
4029 && h
->type
== STT_GNU_IFUNC
4035 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4037 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4038 sections because such sections are not SEC_ALLOC and
4039 thus ld.so will not process them. */
4040 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
4044 else if (h
->plt
.offset
== (bfd_vma
) -1)
4047 /* STT_GNU_IFUNC symbol must go through PLT. */
4048 if (htab
->elf
.splt
!= NULL
)
4050 if (htab
->plt_bnd
!= NULL
)
4052 resolved_plt
= htab
->plt_bnd
;
4053 plt_offset
= eh
->plt_bnd
.offset
;
4057 resolved_plt
= htab
->elf
.splt
;
4058 plt_offset
= h
->plt
.offset
;
4063 resolved_plt
= htab
->elf
.iplt
;
4064 plt_offset
= h
->plt
.offset
;
4067 relocation
= (resolved_plt
->output_section
->vma
4068 + resolved_plt
->output_offset
+ plt_offset
);
4073 if (h
->root
.root
.string
)
4074 name
= h
->root
.root
.string
;
4076 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
4078 (*_bfd_error_handler
)
4079 (_("%B: relocation %s against STT_GNU_IFUNC "
4080 "symbol `%s' isn't handled by %s"), input_bfd
,
4081 x86_64_elf_howto_table
[r_type
].name
,
4082 name
, __FUNCTION__
);
4083 bfd_set_error (bfd_error_bad_value
);
4087 if (bfd_link_pic (info
))
4092 if (ABI_64_P (output_bfd
))
4096 if (rel
->r_addend
!= 0)
4098 if (h
->root
.root
.string
)
4099 name
= h
->root
.root
.string
;
4101 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4103 (*_bfd_error_handler
)
4104 (_("%B: relocation %s against STT_GNU_IFUNC "
4105 "symbol `%s' has non-zero addend: %d"),
4106 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
4107 name
, rel
->r_addend
);
4108 bfd_set_error (bfd_error_bad_value
);
4112 /* Generate dynamic relcoation only when there is a
4113 non-GOT reference in a shared object. */
4114 if (bfd_link_pic (info
) && h
->non_got_ref
)
4116 Elf_Internal_Rela outrel
;
4119 /* Need a dynamic relocation to get the real function
4121 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
4125 if (outrel
.r_offset
== (bfd_vma
) -1
4126 || outrel
.r_offset
== (bfd_vma
) -2)
4129 outrel
.r_offset
+= (input_section
->output_section
->vma
4130 + input_section
->output_offset
);
4132 if (h
->dynindx
== -1
4134 || bfd_link_executable (info
))
4136 /* This symbol is resolved locally. */
4137 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4138 outrel
.r_addend
= (h
->root
.u
.def
.value
4139 + h
->root
.u
.def
.section
->output_section
->vma
4140 + h
->root
.u
.def
.section
->output_offset
);
4144 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4145 outrel
.r_addend
= 0;
4148 sreloc
= htab
->elf
.irelifunc
;
4149 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4151 /* If this reloc is against an external symbol, we
4152 do not want to fiddle with the addend. Otherwise,
4153 we need to include the symbol value so that it
4154 becomes an addend for the dynamic reloc. For an
4155 internal symbol, we have updated addend. */
4160 case R_X86_64_PC32_BND
:
4162 case R_X86_64_PLT32
:
4163 case R_X86_64_PLT32_BND
:
4166 case R_X86_64_GOTPCREL
:
4167 case R_X86_64_GOTPCRELX
:
4168 case R_X86_64_REX_GOTPCRELX
:
4169 case R_X86_64_GOTPCREL64
:
4170 base_got
= htab
->elf
.sgot
;
4171 off
= h
->got
.offset
;
4173 if (base_got
== NULL
)
4176 if (off
== (bfd_vma
) -1)
4178 /* We can't use h->got.offset here to save state, or
4179 even just remember the offset, as finish_dynamic_symbol
4180 would use that as offset into .got. */
4182 if (htab
->elf
.splt
!= NULL
)
4184 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4185 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4186 base_got
= htab
->elf
.sgotplt
;
4190 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4191 off
= plt_index
* GOT_ENTRY_SIZE
;
4192 base_got
= htab
->elf
.igotplt
;
4195 if (h
->dynindx
== -1
4199 /* This references the local defitionion. We must
4200 initialize this entry in the global offset table.
4201 Since the offset must always be a multiple of 8,
4202 we use the least significant bit to record
4203 whether we have initialized it already.
4205 When doing a dynamic link, we create a .rela.got
4206 relocation entry to initialize the value. This
4207 is done in the finish_dynamic_symbol routine. */
4212 bfd_put_64 (output_bfd
, relocation
,
4213 base_got
->contents
+ off
);
4214 /* Note that this is harmless for the GOTPLT64
4215 case, as -1 | 1 still is -1. */
4221 relocation
= (base_got
->output_section
->vma
4222 + base_got
->output_offset
+ off
);
4228 /* When generating a shared object, the relocations handled here are
4229 copied into the output file to be resolved at run time. */
4232 case R_X86_64_GOT32
:
4233 case R_X86_64_GOT64
:
4234 /* Relocation is to the entry for this symbol in the global
4236 case R_X86_64_GOTPCREL
:
4237 case R_X86_64_GOTPCRELX
:
4238 case R_X86_64_REX_GOTPCRELX
:
4239 case R_X86_64_GOTPCREL64
:
4240 /* Use global offset table entry as symbol value. */
4241 case R_X86_64_GOTPLT64
:
4242 /* This is obsolete and treated the the same as GOT64. */
4243 base_got
= htab
->elf
.sgot
;
4245 if (htab
->elf
.sgot
== NULL
)
4252 off
= h
->got
.offset
;
4254 && h
->plt
.offset
!= (bfd_vma
)-1
4255 && off
== (bfd_vma
)-1)
4257 /* We can't use h->got.offset here to save
4258 state, or even just remember the offset, as
4259 finish_dynamic_symbol would use that as offset into
4261 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4262 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4263 base_got
= htab
->elf
.sgotplt
;
4266 dyn
= htab
->elf
.dynamic_sections_created
;
4268 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4269 || (bfd_link_pic (info
)
4270 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4271 || (ELF_ST_VISIBILITY (h
->other
)
4272 && h
->root
.type
== bfd_link_hash_undefweak
))
4274 /* This is actually a static link, or it is a -Bsymbolic
4275 link and the symbol is defined locally, or the symbol
4276 was forced to be local because of a version file. We
4277 must initialize this entry in the global offset table.
4278 Since the offset must always be a multiple of 8, we
4279 use the least significant bit to record whether we
4280 have initialized it already.
4282 When doing a dynamic link, we create a .rela.got
4283 relocation entry to initialize the value. This is
4284 done in the finish_dynamic_symbol routine. */
4289 bfd_put_64 (output_bfd
, relocation
,
4290 base_got
->contents
+ off
);
4291 /* Note that this is harmless for the GOTPLT64 case,
4292 as -1 | 1 still is -1. */
4297 unresolved_reloc
= FALSE
;
4301 if (local_got_offsets
== NULL
)
4304 off
= local_got_offsets
[r_symndx
];
4306 /* The offset must always be a multiple of 8. We use
4307 the least significant bit to record whether we have
4308 already generated the necessary reloc. */
4313 bfd_put_64 (output_bfd
, relocation
,
4314 base_got
->contents
+ off
);
4316 if (bfd_link_pic (info
))
4319 Elf_Internal_Rela outrel
;
4321 /* We need to generate a R_X86_64_RELATIVE reloc
4322 for the dynamic linker. */
4323 s
= htab
->elf
.srelgot
;
4327 outrel
.r_offset
= (base_got
->output_section
->vma
4328 + base_got
->output_offset
4330 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4331 outrel
.r_addend
= relocation
;
4332 elf_append_rela (output_bfd
, s
, &outrel
);
4335 local_got_offsets
[r_symndx
] |= 1;
4339 if (off
>= (bfd_vma
) -2)
4342 relocation
= base_got
->output_section
->vma
4343 + base_got
->output_offset
+ off
;
4344 if (r_type
!= R_X86_64_GOTPCREL
4345 && r_type
!= R_X86_64_GOTPCRELX
4346 && r_type
!= R_X86_64_REX_GOTPCRELX
4347 && r_type
!= R_X86_64_GOTPCREL64
)
4348 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4349 - htab
->elf
.sgotplt
->output_offset
;
4353 case R_X86_64_GOTOFF64
:
4354 /* Relocation is relative to the start of the global offset
4357 /* Check to make sure it isn't a protected function or data
4358 symbol for shared library since it may not be local when
4359 used as function address or with copy relocation. We also
4360 need to make sure that a symbol is referenced locally. */
4361 if (bfd_link_pic (info
) && h
)
4363 if (!h
->def_regular
)
4367 switch (ELF_ST_VISIBILITY (h
->other
))
4370 v
= _("hidden symbol");
4373 v
= _("internal symbol");
4376 v
= _("protected symbol");
4383 (*_bfd_error_handler
)
4384 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4385 input_bfd
, v
, h
->root
.root
.string
);
4386 bfd_set_error (bfd_error_bad_value
);
4389 else if (!bfd_link_executable (info
)
4390 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4391 && (h
->type
== STT_FUNC
4392 || h
->type
== STT_OBJECT
)
4393 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4395 (*_bfd_error_handler
)
4396 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4398 h
->type
== STT_FUNC
? "function" : "data",
4399 h
->root
.root
.string
);
4400 bfd_set_error (bfd_error_bad_value
);
4405 /* Note that sgot is not involved in this
4406 calculation. We always want the start of .got.plt. If we
4407 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4408 permitted by the ABI, we might have to change this
4410 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4411 + htab
->elf
.sgotplt
->output_offset
;
4414 case R_X86_64_GOTPC32
:
4415 case R_X86_64_GOTPC64
:
4416 /* Use global offset table as symbol value. */
4417 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4418 + htab
->elf
.sgotplt
->output_offset
;
4419 unresolved_reloc
= FALSE
;
4422 case R_X86_64_PLTOFF64
:
4423 /* Relocation is PLT entry relative to GOT. For local
4424 symbols it's the symbol itself relative to GOT. */
4426 /* See PLT32 handling. */
4427 && h
->plt
.offset
!= (bfd_vma
) -1
4428 && htab
->elf
.splt
!= NULL
)
4430 if (htab
->plt_bnd
!= NULL
)
4432 resolved_plt
= htab
->plt_bnd
;
4433 plt_offset
= eh
->plt_bnd
.offset
;
4437 resolved_plt
= htab
->elf
.splt
;
4438 plt_offset
= h
->plt
.offset
;
4441 relocation
= (resolved_plt
->output_section
->vma
4442 + resolved_plt
->output_offset
4444 unresolved_reloc
= FALSE
;
4447 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4448 + htab
->elf
.sgotplt
->output_offset
;
4451 case R_X86_64_PLT32
:
4452 case R_X86_64_PLT32_BND
:
4453 /* Relocation is to the entry for this symbol in the
4454 procedure linkage table. */
4456 /* Resolve a PLT32 reloc against a local symbol directly,
4457 without using the procedure linkage table. */
4461 if ((h
->plt
.offset
== (bfd_vma
) -1
4462 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4463 || htab
->elf
.splt
== NULL
)
4465 /* We didn't make a PLT entry for this symbol. This
4466 happens when statically linking PIC code, or when
4467 using -Bsymbolic. */
4471 if (h
->plt
.offset
!= (bfd_vma
) -1)
4473 if (htab
->plt_bnd
!= NULL
)
4475 resolved_plt
= htab
->plt_bnd
;
4476 plt_offset
= eh
->plt_bnd
.offset
;
4480 resolved_plt
= htab
->elf
.splt
;
4481 plt_offset
= h
->plt
.offset
;
4486 /* Use the GOT PLT. */
4487 resolved_plt
= htab
->plt_got
;
4488 plt_offset
= eh
->plt_got
.offset
;
4491 relocation
= (resolved_plt
->output_section
->vma
4492 + resolved_plt
->output_offset
4494 unresolved_reloc
= FALSE
;
4497 case R_X86_64_SIZE32
:
4498 case R_X86_64_SIZE64
:
4499 /* Set to symbol size. */
4500 relocation
= st_size
;
4506 case R_X86_64_PC32_BND
:
4507 /* Don't complain about -fPIC if the symbol is undefined when
4508 building executable. */
4509 if (bfd_link_pic (info
)
4510 && (input_section
->flags
& SEC_ALLOC
) != 0
4511 && (input_section
->flags
& SEC_READONLY
) != 0
4513 && !(bfd_link_executable (info
)
4514 && h
->root
.type
== bfd_link_hash_undefined
))
4516 bfd_boolean fail
= FALSE
;
4518 = ((r_type
== R_X86_64_PC32
4519 || r_type
== R_X86_64_PC32_BND
)
4520 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4522 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4524 /* Symbol is referenced locally. Make sure it is
4525 defined locally or for a branch. */
4526 fail
= !h
->def_regular
&& !branch
;
4528 else if (!(bfd_link_executable (info
)
4529 && (h
->needs_copy
|| eh
->needs_copy
)))
4531 /* Symbol doesn't need copy reloc and isn't referenced
4532 locally. We only allow branch to symbol with
4533 non-default visibility. */
4535 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4542 const char *pic
= "";
4544 switch (ELF_ST_VISIBILITY (h
->other
))
4547 v
= _("hidden symbol");
4550 v
= _("internal symbol");
4553 v
= _("protected symbol");
4557 pic
= _("; recompile with -fPIC");
4562 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4564 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4566 (*_bfd_error_handler
) (fmt
, input_bfd
,
4567 x86_64_elf_howto_table
[r_type
].name
,
4568 v
, h
->root
.root
.string
, pic
);
4569 bfd_set_error (bfd_error_bad_value
);
4580 /* FIXME: The ABI says the linker should make sure the value is
4581 the same when it's zeroextended to 64 bit. */
4584 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4587 /* Don't copy a pc-relative relocation into the output file
4588 if the symbol needs copy reloc or the symbol is undefined
4589 when building executable. Copy dynamic function pointer
4591 if ((bfd_link_pic (info
)
4592 && !(bfd_link_executable (info
)
4596 || h
->root
.type
== bfd_link_hash_undefined
)
4597 && IS_X86_64_PCREL_TYPE (r_type
))
4599 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4600 || h
->root
.type
!= bfd_link_hash_undefweak
)
4601 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4602 && r_type
!= R_X86_64_SIZE32
4603 && r_type
!= R_X86_64_SIZE64
)
4604 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4605 || (ELIMINATE_COPY_RELOCS
4606 && !bfd_link_pic (info
)
4609 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4612 || h
->root
.type
== bfd_link_hash_undefweak
4613 || h
->root
.type
== bfd_link_hash_undefined
)))
4615 Elf_Internal_Rela outrel
;
4616 bfd_boolean skip
, relocate
;
4619 /* When generating a shared object, these relocations
4620 are copied into the output file to be resolved at run
4626 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4628 if (outrel
.r_offset
== (bfd_vma
) -1)
4630 else if (outrel
.r_offset
== (bfd_vma
) -2)
4631 skip
= TRUE
, relocate
= TRUE
;
4633 outrel
.r_offset
+= (input_section
->output_section
->vma
4634 + input_section
->output_offset
);
4637 memset (&outrel
, 0, sizeof outrel
);
4639 /* h->dynindx may be -1 if this symbol was marked to
4643 && (IS_X86_64_PCREL_TYPE (r_type
)
4644 || ! bfd_link_pic (info
)
4645 || ! SYMBOLIC_BIND (info
, h
)
4646 || ! h
->def_regular
))
4648 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4649 outrel
.r_addend
= rel
->r_addend
;
4653 /* This symbol is local, or marked to become local. */
4654 if (r_type
== htab
->pointer_r_type
)
4657 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4658 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4660 else if (r_type
== R_X86_64_64
4661 && !ABI_64_P (output_bfd
))
4664 outrel
.r_info
= htab
->r_info (0,
4665 R_X86_64_RELATIVE64
);
4666 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4667 /* Check addend overflow. */
4668 if ((outrel
.r_addend
& 0x80000000)
4669 != (rel
->r_addend
& 0x80000000))
4672 int addend
= rel
->r_addend
;
4673 if (h
&& h
->root
.root
.string
)
4674 name
= h
->root
.root
.string
;
4676 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4679 (*_bfd_error_handler
)
4680 (_("%B: addend -0x%x in relocation %s against "
4681 "symbol `%s' at 0x%lx in section `%A' is "
4683 input_bfd
, input_section
, addend
,
4684 x86_64_elf_howto_table
[r_type
].name
,
4685 name
, (unsigned long) rel
->r_offset
);
4687 (*_bfd_error_handler
)
4688 (_("%B: addend 0x%x in relocation %s against "
4689 "symbol `%s' at 0x%lx in section `%A' is "
4691 input_bfd
, input_section
, addend
,
4692 x86_64_elf_howto_table
[r_type
].name
,
4693 name
, (unsigned long) rel
->r_offset
);
4694 bfd_set_error (bfd_error_bad_value
);
4702 if (bfd_is_abs_section (sec
))
4704 else if (sec
== NULL
|| sec
->owner
== NULL
)
4706 bfd_set_error (bfd_error_bad_value
);
4713 /* We are turning this relocation into one
4714 against a section symbol. It would be
4715 proper to subtract the symbol's value,
4716 osec->vma, from the emitted reloc addend,
4717 but ld.so expects buggy relocs. */
4718 osec
= sec
->output_section
;
4719 sindx
= elf_section_data (osec
)->dynindx
;
4722 asection
*oi
= htab
->elf
.text_index_section
;
4723 sindx
= elf_section_data (oi
)->dynindx
;
4725 BFD_ASSERT (sindx
!= 0);
4728 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4729 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4733 sreloc
= elf_section_data (input_section
)->sreloc
;
4735 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4737 r
= bfd_reloc_notsupported
;
4738 goto check_relocation_error
;
4741 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4743 /* If this reloc is against an external symbol, we do
4744 not want to fiddle with the addend. Otherwise, we
4745 need to include the symbol value so that it becomes
4746 an addend for the dynamic reloc. */
4753 case R_X86_64_TLSGD
:
4754 case R_X86_64_GOTPC32_TLSDESC
:
4755 case R_X86_64_TLSDESC_CALL
:
4756 case R_X86_64_GOTTPOFF
:
4757 tls_type
= GOT_UNKNOWN
;
4758 if (h
== NULL
&& local_got_offsets
)
4759 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4761 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4763 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4764 input_section
, contents
,
4765 symtab_hdr
, sym_hashes
,
4766 &r_type
, tls_type
, rel
,
4767 relend
, h
, r_symndx
))
4770 if (r_type
== R_X86_64_TPOFF32
)
4772 bfd_vma roff
= rel
->r_offset
;
4774 BFD_ASSERT (! unresolved_reloc
);
4776 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4778 /* GD->LE transition. For 64bit, change
4779 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4780 .word 0x6666; rex64; call __tls_get_addr
4783 leaq foo@tpoff(%rax), %rax
4785 leaq foo@tlsgd(%rip), %rdi
4786 .word 0x6666; rex64; call __tls_get_addr
4789 leaq foo@tpoff(%rax), %rax
4790 For largepic, change:
4791 leaq foo@tlsgd(%rip), %rdi
4792 movabsq $__tls_get_addr@pltoff, %rax
4797 leaq foo@tpoff(%rax), %rax
4798 nopw 0x0(%rax,%rax,1) */
4800 if (ABI_64_P (output_bfd
)
4801 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4803 memcpy (contents
+ roff
- 3,
4804 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4805 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4808 else if (ABI_64_P (output_bfd
))
4809 memcpy (contents
+ roff
- 4,
4810 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4813 memcpy (contents
+ roff
- 3,
4814 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4816 bfd_put_32 (output_bfd
,
4817 elf_x86_64_tpoff (info
, relocation
),
4818 contents
+ roff
+ 8 + largepic
);
4819 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4824 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4826 /* GDesc -> LE transition.
4827 It's originally something like:
4828 leaq x@tlsdesc(%rip), %rax
4831 movl $x@tpoff, %rax. */
4833 unsigned int val
, type
;
4835 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4836 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4837 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4838 contents
+ roff
- 3);
4839 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4840 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4841 contents
+ roff
- 1);
4842 bfd_put_32 (output_bfd
,
4843 elf_x86_64_tpoff (info
, relocation
),
4847 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4849 /* GDesc -> LE transition.
4854 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4855 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4858 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4860 /* IE->LE transition:
4861 For 64bit, originally it can be one of:
4862 movq foo@gottpoff(%rip), %reg
4863 addq foo@gottpoff(%rip), %reg
4866 leaq foo(%reg), %reg
4868 For 32bit, originally it can be one of:
4869 movq foo@gottpoff(%rip), %reg
4870 addl foo@gottpoff(%rip), %reg
4873 leal foo(%reg), %reg
4876 unsigned int val
, type
, reg
;
4879 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4882 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4883 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4889 bfd_put_8 (output_bfd
, 0x49,
4890 contents
+ roff
- 3);
4891 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4892 bfd_put_8 (output_bfd
, 0x41,
4893 contents
+ roff
- 3);
4894 bfd_put_8 (output_bfd
, 0xc7,
4895 contents
+ roff
- 2);
4896 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4897 contents
+ roff
- 1);
4901 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4904 bfd_put_8 (output_bfd
, 0x49,
4905 contents
+ roff
- 3);
4906 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4907 bfd_put_8 (output_bfd
, 0x41,
4908 contents
+ roff
- 3);
4909 bfd_put_8 (output_bfd
, 0x81,
4910 contents
+ roff
- 2);
4911 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4912 contents
+ roff
- 1);
4916 /* addq/addl -> leaq/leal */
4918 bfd_put_8 (output_bfd
, 0x4d,
4919 contents
+ roff
- 3);
4920 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4921 bfd_put_8 (output_bfd
, 0x45,
4922 contents
+ roff
- 3);
4923 bfd_put_8 (output_bfd
, 0x8d,
4924 contents
+ roff
- 2);
4925 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4926 contents
+ roff
- 1);
4928 bfd_put_32 (output_bfd
,
4929 elf_x86_64_tpoff (info
, relocation
),
4937 if (htab
->elf
.sgot
== NULL
)
4942 off
= h
->got
.offset
;
4943 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4947 if (local_got_offsets
== NULL
)
4950 off
= local_got_offsets
[r_symndx
];
4951 offplt
= local_tlsdesc_gotents
[r_symndx
];
4958 Elf_Internal_Rela outrel
;
4962 if (htab
->elf
.srelgot
== NULL
)
4965 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4967 if (GOT_TLS_GDESC_P (tls_type
))
4969 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4970 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4971 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4972 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4973 + htab
->elf
.sgotplt
->output_offset
4975 + htab
->sgotplt_jump_table_size
);
4976 sreloc
= htab
->elf
.srelplt
;
4978 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4980 outrel
.r_addend
= 0;
4981 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4984 sreloc
= htab
->elf
.srelgot
;
4986 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4987 + htab
->elf
.sgot
->output_offset
+ off
);
4989 if (GOT_TLS_GD_P (tls_type
))
4990 dr_type
= R_X86_64_DTPMOD64
;
4991 else if (GOT_TLS_GDESC_P (tls_type
))
4994 dr_type
= R_X86_64_TPOFF64
;
4996 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4997 outrel
.r_addend
= 0;
4998 if ((dr_type
== R_X86_64_TPOFF64
4999 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
5000 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
5001 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
5003 elf_append_rela (output_bfd
, sreloc
, &outrel
);
5005 if (GOT_TLS_GD_P (tls_type
))
5009 BFD_ASSERT (! unresolved_reloc
);
5010 bfd_put_64 (output_bfd
,
5011 relocation
- elf_x86_64_dtpoff_base (info
),
5012 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5016 bfd_put_64 (output_bfd
, 0,
5017 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5018 outrel
.r_info
= htab
->r_info (indx
,
5020 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
5021 elf_append_rela (output_bfd
, sreloc
,
5030 local_got_offsets
[r_symndx
] |= 1;
5033 if (off
>= (bfd_vma
) -2
5034 && ! GOT_TLS_GDESC_P (tls_type
))
5036 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
5038 if (r_type
== R_X86_64_GOTPC32_TLSDESC
5039 || r_type
== R_X86_64_TLSDESC_CALL
)
5040 relocation
= htab
->elf
.sgotplt
->output_section
->vma
5041 + htab
->elf
.sgotplt
->output_offset
5042 + offplt
+ htab
->sgotplt_jump_table_size
;
5044 relocation
= htab
->elf
.sgot
->output_section
->vma
5045 + htab
->elf
.sgot
->output_offset
+ off
;
5046 unresolved_reloc
= FALSE
;
5050 bfd_vma roff
= rel
->r_offset
;
5052 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
5054 /* GD->IE transition. For 64bit, change
5055 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5056 .word 0x6666; rex64; call __tls_get_addr@plt
5059 addq foo@gottpoff(%rip), %rax
5061 leaq foo@tlsgd(%rip), %rdi
5062 .word 0x6666; rex64; call __tls_get_addr@plt
5065 addq foo@gottpoff(%rip), %rax
5066 For largepic, change:
5067 leaq foo@tlsgd(%rip), %rdi
5068 movabsq $__tls_get_addr@pltoff, %rax
5073 addq foo@gottpoff(%rax), %rax
5074 nopw 0x0(%rax,%rax,1) */
5076 if (ABI_64_P (output_bfd
)
5077 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
5079 memcpy (contents
+ roff
- 3,
5080 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5081 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5084 else if (ABI_64_P (output_bfd
))
5085 memcpy (contents
+ roff
- 4,
5086 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5089 memcpy (contents
+ roff
- 3,
5090 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5093 relocation
= (htab
->elf
.sgot
->output_section
->vma
5094 + htab
->elf
.sgot
->output_offset
+ off
5097 - input_section
->output_section
->vma
5098 - input_section
->output_offset
5100 bfd_put_32 (output_bfd
, relocation
,
5101 contents
+ roff
+ 8 + largepic
);
5102 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5107 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
5109 /* GDesc -> IE transition.
5110 It's originally something like:
5111 leaq x@tlsdesc(%rip), %rax
5114 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5116 /* Now modify the instruction as appropriate. To
5117 turn a leaq into a movq in the form we use it, it
5118 suffices to change the second byte from 0x8d to
5120 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
5122 bfd_put_32 (output_bfd
,
5123 htab
->elf
.sgot
->output_section
->vma
5124 + htab
->elf
.sgot
->output_offset
+ off
5126 - input_section
->output_section
->vma
5127 - input_section
->output_offset
5132 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
5134 /* GDesc -> IE transition.
5141 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
5142 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
5150 case R_X86_64_TLSLD
:
5151 if (! elf_x86_64_tls_transition (info
, input_bfd
,
5152 input_section
, contents
,
5153 symtab_hdr
, sym_hashes
,
5154 &r_type
, GOT_UNKNOWN
,
5155 rel
, relend
, h
, r_symndx
))
5158 if (r_type
!= R_X86_64_TLSLD
)
5160 /* LD->LE transition:
5161 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
5162 For 64bit, we change it into:
5163 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
5164 For 32bit, we change it into:
5165 nopl 0x0(%rax); movl %fs:0, %eax.
5166 For largepic, change:
5167 leaq foo@tlsgd(%rip), %rdi
5168 movabsq $__tls_get_addr@pltoff, %rax
5172 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
5175 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
5176 if (ABI_64_P (output_bfd
)
5177 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
5178 memcpy (contents
+ rel
->r_offset
- 3,
5179 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5180 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5181 else if (ABI_64_P (output_bfd
))
5182 memcpy (contents
+ rel
->r_offset
- 3,
5183 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5185 memcpy (contents
+ rel
->r_offset
- 3,
5186 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5187 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5193 if (htab
->elf
.sgot
== NULL
)
5196 off
= htab
->tls_ld_got
.offset
;
5201 Elf_Internal_Rela outrel
;
5203 if (htab
->elf
.srelgot
== NULL
)
5206 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5207 + htab
->elf
.sgot
->output_offset
+ off
);
5209 bfd_put_64 (output_bfd
, 0,
5210 htab
->elf
.sgot
->contents
+ off
);
5211 bfd_put_64 (output_bfd
, 0,
5212 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5213 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5214 outrel
.r_addend
= 0;
5215 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5217 htab
->tls_ld_got
.offset
|= 1;
5219 relocation
= htab
->elf
.sgot
->output_section
->vma
5220 + htab
->elf
.sgot
->output_offset
+ off
;
5221 unresolved_reloc
= FALSE
;
5224 case R_X86_64_DTPOFF32
:
5225 if (!bfd_link_executable (info
)
5226 || (input_section
->flags
& SEC_CODE
) == 0)
5227 relocation
-= elf_x86_64_dtpoff_base (info
);
5229 relocation
= elf_x86_64_tpoff (info
, relocation
);
5232 case R_X86_64_TPOFF32
:
5233 case R_X86_64_TPOFF64
:
5234 BFD_ASSERT (bfd_link_executable (info
));
5235 relocation
= elf_x86_64_tpoff (info
, relocation
);
5238 case R_X86_64_DTPOFF64
:
5239 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5240 relocation
-= elf_x86_64_dtpoff_base (info
);
5247 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5248 because such sections are not SEC_ALLOC and thus ld.so will
5249 not process them. */
5250 if (unresolved_reloc
5251 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5253 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5254 rel
->r_offset
) != (bfd_vma
) -1)
5256 (*_bfd_error_handler
)
5257 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5260 (long) rel
->r_offset
,
5262 h
->root
.root
.string
);
5267 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5268 contents
, rel
->r_offset
,
5269 relocation
, rel
->r_addend
);
5271 check_relocation_error
:
5272 if (r
!= bfd_reloc_ok
)
5277 name
= h
->root
.root
.string
;
5280 name
= bfd_elf_string_from_elf_section (input_bfd
,
5281 symtab_hdr
->sh_link
,
5286 name
= bfd_section_name (input_bfd
, sec
);
5289 if (r
== bfd_reloc_overflow
)
5291 if (! ((*info
->callbacks
->reloc_overflow
)
5292 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5293 (bfd_vma
) 0, input_bfd
, input_section
,
5299 (*_bfd_error_handler
)
5300 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5301 input_bfd
, input_section
,
5302 (long) rel
->r_offset
, name
, (int) r
);
5313 Elf_Internal_Shdr
*rel_hdr
;
5314 size_t deleted
= rel
- wrel
;
5316 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
5317 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5318 if (rel_hdr
->sh_size
== 0)
5320 /* It is too late to remove an empty reloc section. Leave
5322 ??? What is wrong with an empty section??? */
5323 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
5326 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
5327 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
5328 input_section
->reloc_count
-= deleted
;
5334 /* Finish up dynamic symbol handling. We set the contents of various
5335 dynamic sections here. */
5338 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5339 struct bfd_link_info
*info
,
5340 struct elf_link_hash_entry
*h
,
5341 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5343 struct elf_x86_64_link_hash_table
*htab
;
5344 const struct elf_x86_64_backend_data
*abed
;
5345 bfd_boolean use_plt_bnd
;
5346 struct elf_x86_64_link_hash_entry
*eh
;
5348 htab
= elf_x86_64_hash_table (info
);
5352 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5353 section only if there is .plt section. */
5354 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5356 ? &elf_x86_64_bnd_arch_bed
5357 : get_elf_x86_64_backend_data (output_bfd
));
5359 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5361 if (h
->plt
.offset
!= (bfd_vma
) -1)
5364 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5365 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5366 Elf_Internal_Rela rela
;
5368 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5369 const struct elf_backend_data
*bed
;
5370 bfd_vma plt_got_pcrel_offset
;
5372 /* When building a static executable, use .iplt, .igot.plt and
5373 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5374 if (htab
->elf
.splt
!= NULL
)
5376 plt
= htab
->elf
.splt
;
5377 gotplt
= htab
->elf
.sgotplt
;
5378 relplt
= htab
->elf
.srelplt
;
5382 plt
= htab
->elf
.iplt
;
5383 gotplt
= htab
->elf
.igotplt
;
5384 relplt
= htab
->elf
.irelplt
;
5387 /* This symbol has an entry in the procedure linkage table. Set
5389 if ((h
->dynindx
== -1
5390 && !((h
->forced_local
|| bfd_link_executable (info
))
5392 && h
->type
== STT_GNU_IFUNC
))
5398 /* Get the index in the procedure linkage table which
5399 corresponds to this symbol. This is the index of this symbol
5400 in all the symbols for which we are making plt entries. The
5401 first entry in the procedure linkage table is reserved.
5403 Get the offset into the .got table of the entry that
5404 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5405 bytes. The first three are reserved for the dynamic linker.
5407 For static executables, we don't reserve anything. */
5409 if (plt
== htab
->elf
.splt
)
5411 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5412 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5416 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5417 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5420 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5421 plt_plt_offset
= abed
->plt_plt_offset
;
5422 plt_got_insn_size
= abed
->plt_got_insn_size
;
5423 plt_got_offset
= abed
->plt_got_offset
;
5426 /* Use the second PLT with BND relocations. */
5427 const bfd_byte
*plt_entry
, *plt2_entry
;
5429 if (eh
->has_bnd_reloc
)
5431 plt_entry
= elf_x86_64_bnd_plt_entry
;
5432 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5436 plt_entry
= elf_x86_64_legacy_plt_entry
;
5437 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5439 /* Subtract 1 since there is no BND prefix. */
5440 plt_plt_insn_end
-= 1;
5441 plt_plt_offset
-= 1;
5442 plt_got_insn_size
-= 1;
5443 plt_got_offset
-= 1;
5446 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5447 == sizeof (elf_x86_64_legacy_plt_entry
));
5449 /* Fill in the entry in the procedure linkage table. */
5450 memcpy (plt
->contents
+ h
->plt
.offset
,
5451 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5452 /* Fill in the entry in the second PLT. */
5453 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5454 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5456 resolved_plt
= htab
->plt_bnd
;
5457 plt_offset
= eh
->plt_bnd
.offset
;
5461 /* Fill in the entry in the procedure linkage table. */
5462 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5463 abed
->plt_entry_size
);
5466 plt_offset
= h
->plt
.offset
;
5469 /* Insert the relocation positions of the plt section. */
5471 /* Put offset the PC-relative instruction referring to the GOT entry,
5472 subtracting the size of that instruction. */
5473 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5474 + gotplt
->output_offset
5476 - resolved_plt
->output_section
->vma
5477 - resolved_plt
->output_offset
5479 - plt_got_insn_size
);
5481 /* Check PC-relative offset overflow in PLT entry. */
5482 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5483 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5484 output_bfd
, h
->root
.root
.string
);
5486 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5487 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5489 /* Fill in the entry in the global offset table, initially this
5490 points to the second part of the PLT entry. */
5491 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5492 + plt
->output_offset
5493 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5494 gotplt
->contents
+ got_offset
);
5496 /* Fill in the entry in the .rela.plt section. */
5497 rela
.r_offset
= (gotplt
->output_section
->vma
5498 + gotplt
->output_offset
5500 if (h
->dynindx
== -1
5501 || ((bfd_link_executable (info
)
5502 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5504 && h
->type
== STT_GNU_IFUNC
))
5506 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5507 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5508 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5509 rela
.r_addend
= (h
->root
.u
.def
.value
5510 + h
->root
.u
.def
.section
->output_section
->vma
5511 + h
->root
.u
.def
.section
->output_offset
);
5512 /* R_X86_64_IRELATIVE comes last. */
5513 plt_index
= htab
->next_irelative_index
--;
5517 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5519 plt_index
= htab
->next_jump_slot_index
++;
5522 /* Don't fill PLT entry for static executables. */
5523 if (plt
== htab
->elf
.splt
)
5525 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5527 /* Put relocation index. */
5528 bfd_put_32 (output_bfd
, plt_index
,
5529 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5531 /* Put offset for jmp .PLT0 and check for overflow. We don't
5532 check relocation index for overflow since branch displacement
5533 will overflow first. */
5534 if (plt0_offset
> 0x80000000)
5535 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5536 output_bfd
, h
->root
.root
.string
);
5537 bfd_put_32 (output_bfd
, - plt0_offset
,
5538 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5541 bed
= get_elf_backend_data (output_bfd
);
5542 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5543 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5545 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5547 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5548 asection
*plt
, *got
;
5549 bfd_boolean got_after_plt
;
5550 int32_t got_pcrel_offset
;
5551 const bfd_byte
*got_plt_entry
;
5553 /* Set the entry in the GOT procedure linkage table. */
5554 plt
= htab
->plt_got
;
5555 got
= htab
->elf
.sgot
;
5556 got_offset
= h
->got
.offset
;
5558 if (got_offset
== (bfd_vma
) -1
5559 || h
->type
== STT_GNU_IFUNC
5564 /* Use the second PLT entry template for the GOT PLT since they
5565 are the identical. */
5566 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5567 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5568 if (eh
->has_bnd_reloc
)
5569 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5572 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5574 /* Subtract 1 since there is no BND prefix. */
5575 plt_got_insn_size
-= 1;
5576 plt_got_offset
-= 1;
5579 /* Fill in the entry in the GOT procedure linkage table. */
5580 plt_offset
= eh
->plt_got
.offset
;
5581 memcpy (plt
->contents
+ plt_offset
,
5582 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5584 /* Put offset the PC-relative instruction referring to the GOT
5585 entry, subtracting the size of that instruction. */
5586 got_pcrel_offset
= (got
->output_section
->vma
5587 + got
->output_offset
5589 - plt
->output_section
->vma
5590 - plt
->output_offset
5592 - plt_got_insn_size
);
5594 /* Check PC-relative offset overflow in GOT PLT entry. */
5595 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5596 if ((got_after_plt
&& got_pcrel_offset
< 0)
5597 || (!got_after_plt
&& got_pcrel_offset
> 0))
5598 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5599 output_bfd
, h
->root
.root
.string
);
5601 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5602 plt
->contents
+ plt_offset
+ plt_got_offset
);
5606 && (h
->plt
.offset
!= (bfd_vma
) -1
5607 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5609 /* Mark the symbol as undefined, rather than as defined in
5610 the .plt section. Leave the value if there were any
5611 relocations where pointer equality matters (this is a clue
5612 for the dynamic linker, to make function pointer
5613 comparisons work between an application and shared
5614 library), otherwise set it to zero. If a function is only
5615 called from a binary, there is no need to slow down
5616 shared libraries because of that. */
5617 sym
->st_shndx
= SHN_UNDEF
;
5618 if (!h
->pointer_equality_needed
)
5622 if (h
->got
.offset
!= (bfd_vma
) -1
5623 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5624 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5626 Elf_Internal_Rela rela
;
5628 /* This symbol has an entry in the global offset table. Set it
5630 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5633 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5634 + htab
->elf
.sgot
->output_offset
5635 + (h
->got
.offset
&~ (bfd_vma
) 1));
5637 /* If this is a static link, or it is a -Bsymbolic link and the
5638 symbol is defined locally or was forced to be local because
5639 of a version file, we just want to emit a RELATIVE reloc.
5640 The entry in the global offset table will already have been
5641 initialized in the relocate_section function. */
5643 && h
->type
== STT_GNU_IFUNC
)
5645 if (bfd_link_pic (info
))
5647 /* Generate R_X86_64_GLOB_DAT. */
5654 if (!h
->pointer_equality_needed
)
5657 /* For non-shared object, we can't use .got.plt, which
5658 contains the real function addres if we need pointer
5659 equality. We load the GOT entry with the PLT entry. */
5660 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5661 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5662 + plt
->output_offset
5664 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5668 else if (bfd_link_pic (info
)
5669 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5671 if (!h
->def_regular
)
5673 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5674 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5675 rela
.r_addend
= (h
->root
.u
.def
.value
5676 + h
->root
.u
.def
.section
->output_section
->vma
5677 + h
->root
.u
.def
.section
->output_offset
);
5681 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5683 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5684 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5685 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5689 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5694 Elf_Internal_Rela rela
;
5696 /* This symbol needs a copy reloc. Set it up. */
5698 if (h
->dynindx
== -1
5699 || (h
->root
.type
!= bfd_link_hash_defined
5700 && h
->root
.type
!= bfd_link_hash_defweak
)
5701 || htab
->srelbss
== NULL
)
5704 rela
.r_offset
= (h
->root
.u
.def
.value
5705 + h
->root
.u
.def
.section
->output_section
->vma
5706 + h
->root
.u
.def
.section
->output_offset
);
5707 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5709 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5715 /* Finish up local dynamic symbol handling. We set the contents of
5716 various dynamic sections here. */
5719 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5721 struct elf_link_hash_entry
*h
5722 = (struct elf_link_hash_entry
*) *slot
;
5723 struct bfd_link_info
*info
5724 = (struct bfd_link_info
*) inf
;
5726 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5730 /* Used to decide how to sort relocs in an optimal manner for the
5731 dynamic linker, before writing them out. */
5733 static enum elf_reloc_type_class
5734 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
5735 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5736 const Elf_Internal_Rela
*rela
)
5738 bfd
*abfd
= info
->output_bfd
;
5739 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5740 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
5742 if (htab
->elf
.dynsym
!= NULL
5743 && htab
->elf
.dynsym
->contents
!= NULL
)
5745 /* Check relocation against STT_GNU_IFUNC symbol if there are
5747 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
5748 Elf_Internal_Sym sym
;
5749 if (!bed
->s
->swap_symbol_in (abfd
,
5750 (htab
->elf
.dynsym
->contents
5751 + r_symndx
* bed
->s
->sizeof_sym
),
5755 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5756 return reloc_class_ifunc
;
5759 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5761 case R_X86_64_RELATIVE
:
5762 case R_X86_64_RELATIVE64
:
5763 return reloc_class_relative
;
5764 case R_X86_64_JUMP_SLOT
:
5765 return reloc_class_plt
;
5767 return reloc_class_copy
;
5769 return reloc_class_normal
;
5773 /* Finish up the dynamic sections. */
5776 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5777 struct bfd_link_info
*info
)
5779 struct elf_x86_64_link_hash_table
*htab
;
5782 const struct elf_x86_64_backend_data
*abed
;
5784 htab
= elf_x86_64_hash_table (info
);
5788 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5789 section only if there is .plt section. */
5790 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5791 ? &elf_x86_64_bnd_arch_bed
5792 : get_elf_x86_64_backend_data (output_bfd
));
5794 dynobj
= htab
->elf
.dynobj
;
5795 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5797 if (htab
->elf
.dynamic_sections_created
)
5799 bfd_byte
*dyncon
, *dynconend
;
5800 const struct elf_backend_data
*bed
;
5801 bfd_size_type sizeof_dyn
;
5803 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5806 bed
= get_elf_backend_data (dynobj
);
5807 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5808 dyncon
= sdyn
->contents
;
5809 dynconend
= sdyn
->contents
+ sdyn
->size
;
5810 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5812 Elf_Internal_Dyn dyn
;
5815 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5823 s
= htab
->elf
.sgotplt
;
5824 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5828 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5832 s
= htab
->elf
.srelplt
->output_section
;
5833 dyn
.d_un
.d_val
= s
->size
;
5837 /* The procedure linkage table relocs (DT_JMPREL) should
5838 not be included in the overall relocs (DT_RELA).
5839 Therefore, we override the DT_RELASZ entry here to
5840 make it not include the JMPREL relocs. Since the
5841 linker script arranges for .rela.plt to follow all
5842 other relocation sections, we don't have to worry
5843 about changing the DT_RELA entry. */
5844 if (htab
->elf
.srelplt
!= NULL
)
5846 s
= htab
->elf
.srelplt
->output_section
;
5847 dyn
.d_un
.d_val
-= s
->size
;
5851 case DT_TLSDESC_PLT
:
5853 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5854 + htab
->tlsdesc_plt
;
5857 case DT_TLSDESC_GOT
:
5859 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5860 + htab
->tlsdesc_got
;
5864 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5867 /* Fill in the special first entry in the procedure linkage table. */
5868 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5870 /* Fill in the first entry in the procedure linkage table. */
5871 memcpy (htab
->elf
.splt
->contents
,
5872 abed
->plt0_entry
, abed
->plt_entry_size
);
5873 /* Add offset for pushq GOT+8(%rip), since the instruction
5874 uses 6 bytes subtract this value. */
5875 bfd_put_32 (output_bfd
,
5876 (htab
->elf
.sgotplt
->output_section
->vma
5877 + htab
->elf
.sgotplt
->output_offset
5879 - htab
->elf
.splt
->output_section
->vma
5880 - htab
->elf
.splt
->output_offset
5882 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5883 /* Add offset for the PC-relative instruction accessing GOT+16,
5884 subtracting the offset to the end of that instruction. */
5885 bfd_put_32 (output_bfd
,
5886 (htab
->elf
.sgotplt
->output_section
->vma
5887 + htab
->elf
.sgotplt
->output_offset
5889 - htab
->elf
.splt
->output_section
->vma
5890 - htab
->elf
.splt
->output_offset
5891 - abed
->plt0_got2_insn_end
),
5892 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5894 elf_section_data (htab
->elf
.splt
->output_section
)
5895 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5897 if (htab
->tlsdesc_plt
)
5899 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5900 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5902 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5903 abed
->plt0_entry
, abed
->plt_entry_size
);
5905 /* Add offset for pushq GOT+8(%rip), since the
5906 instruction uses 6 bytes subtract this value. */
5907 bfd_put_32 (output_bfd
,
5908 (htab
->elf
.sgotplt
->output_section
->vma
5909 + htab
->elf
.sgotplt
->output_offset
5911 - htab
->elf
.splt
->output_section
->vma
5912 - htab
->elf
.splt
->output_offset
5915 htab
->elf
.splt
->contents
5916 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5917 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5918 where TGD stands for htab->tlsdesc_got, subtracting the offset
5919 to the end of that instruction. */
5920 bfd_put_32 (output_bfd
,
5921 (htab
->elf
.sgot
->output_section
->vma
5922 + htab
->elf
.sgot
->output_offset
5924 - htab
->elf
.splt
->output_section
->vma
5925 - htab
->elf
.splt
->output_offset
5927 - abed
->plt0_got2_insn_end
),
5928 htab
->elf
.splt
->contents
5929 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5934 if (htab
->plt_bnd
!= NULL
)
5935 elf_section_data (htab
->plt_bnd
->output_section
)
5936 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5938 if (htab
->elf
.sgotplt
)
5940 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5942 (*_bfd_error_handler
)
5943 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5947 /* Fill in the first three entries in the global offset table. */
5948 if (htab
->elf
.sgotplt
->size
> 0)
5950 /* Set the first entry in the global offset table to the address of
5951 the dynamic section. */
5953 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5955 bfd_put_64 (output_bfd
,
5956 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5957 htab
->elf
.sgotplt
->contents
);
5958 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5959 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5960 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5963 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5967 /* Adjust .eh_frame for .plt section. */
5968 if (htab
->plt_eh_frame
!= NULL
5969 && htab
->plt_eh_frame
->contents
!= NULL
)
5971 if (htab
->elf
.splt
!= NULL
5972 && htab
->elf
.splt
->size
!= 0
5973 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5974 && htab
->elf
.splt
->output_section
!= NULL
5975 && htab
->plt_eh_frame
->output_section
!= NULL
)
5977 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5978 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5979 + htab
->plt_eh_frame
->output_offset
5980 + PLT_FDE_START_OFFSET
;
5981 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5982 htab
->plt_eh_frame
->contents
5983 + PLT_FDE_START_OFFSET
);
5985 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5987 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5989 htab
->plt_eh_frame
->contents
))
5994 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5995 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5998 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5999 htab_traverse (htab
->loc_hash_table
,
6000 elf_x86_64_finish_local_dynamic_symbol
,
6006 /* Return an array of PLT entry symbol values. */
6009 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
6012 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
6015 bfd_vma
*plt_sym_val
;
6017 bfd_byte
*plt_contents
;
6018 const struct elf_x86_64_backend_data
*bed
;
6019 Elf_Internal_Shdr
*hdr
;
6022 /* Get the .plt section contents. PLT passed down may point to the
6023 .plt.bnd section. Make sure that PLT always points to the .plt
6025 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6030 plt
= bfd_get_section_by_name (abfd
, ".plt");
6033 bed
= &elf_x86_64_bnd_arch_bed
;
6036 bed
= get_elf_x86_64_backend_data (abfd
);
6038 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
6039 if (plt_contents
== NULL
)
6041 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
6042 plt_contents
, 0, plt
->size
))
6045 free (plt_contents
);
6049 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
6050 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
6053 hdr
= &elf_section_data (relplt
)->this_hdr
;
6054 count
= relplt
->size
/ hdr
->sh_entsize
;
6056 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
6057 if (plt_sym_val
== NULL
)
6060 for (i
= 0; i
< count
; i
++)
6061 plt_sym_val
[i
] = -1;
6063 plt_offset
= bed
->plt_entry_size
;
6064 p
= relplt
->relocation
;
6065 for (i
= 0; i
< count
; i
++, p
++)
6069 /* Skip unknown relocation. */
6070 if (p
->howto
== NULL
)
6073 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
6074 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
6077 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
6078 + bed
->plt_reloc_offset
));
6079 if (reloc_index
< count
)
6083 /* This is the index in .plt section. */
6084 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
6085 /* Store VMA + the offset in .plt.bnd section. */
6086 plt_sym_val
[reloc_index
] =
6088 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
6091 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
6093 plt_offset
+= bed
->plt_entry_size
;
6095 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6097 if (plt_offset
>= plt
->size
)
6101 free (plt_contents
);
6106 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6110 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
6117 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6118 as PLT if it exists. */
6119 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
6121 plt
= bfd_get_section_by_name (abfd
, ".plt");
6122 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
6123 dynsymcount
, dynsyms
, ret
,
6125 elf_x86_64_get_plt_sym_val
);
6128 /* Handle an x86-64 specific section when reading an object file. This
6129 is called when elfcode.h finds a section with an unknown type. */
6132 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
6133 const char *name
, int shindex
)
6135 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
6138 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
6144 /* Hook called by the linker routine which adds symbols from an object
6145 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6149 elf_x86_64_add_symbol_hook (bfd
*abfd
,
6150 struct bfd_link_info
*info
,
6151 Elf_Internal_Sym
*sym
,
6152 const char **namep ATTRIBUTE_UNUSED
,
6153 flagword
*flagsp ATTRIBUTE_UNUSED
,
6159 switch (sym
->st_shndx
)
6161 case SHN_X86_64_LCOMMON
:
6162 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
6165 lcomm
= bfd_make_section_with_flags (abfd
,
6169 | SEC_LINKER_CREATED
));
6172 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
6175 *valp
= sym
->st_size
;
6179 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
6180 && (abfd
->flags
& DYNAMIC
) == 0
6181 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
6182 elf_tdata (info
->output_bfd
)->has_gnu_symbols
6183 |= elf_gnu_symbol_unique
;
6189 /* Given a BFD section, try to locate the corresponding ELF section
6193 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
6194 asection
*sec
, int *index_return
)
6196 if (sec
== &_bfd_elf_large_com_section
)
6198 *index_return
= SHN_X86_64_LCOMMON
;
6204 /* Process a symbol. */
6207 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
6210 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
6212 switch (elfsym
->internal_elf_sym
.st_shndx
)
6214 case SHN_X86_64_LCOMMON
:
6215 asym
->section
= &_bfd_elf_large_com_section
;
6216 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6217 /* Common symbol doesn't set BSF_GLOBAL. */
6218 asym
->flags
&= ~BSF_GLOBAL
;
6224 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6226 return (sym
->st_shndx
== SHN_COMMON
6227 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6231 elf_x86_64_common_section_index (asection
*sec
)
6233 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6236 return SHN_X86_64_LCOMMON
;
6240 elf_x86_64_common_section (asection
*sec
)
6242 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6243 return bfd_com_section_ptr
;
6245 return &_bfd_elf_large_com_section
;
6249 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6250 const Elf_Internal_Sym
*sym
,
6255 const asection
*oldsec
)
6257 /* A normal common symbol and a large common symbol result in a
6258 normal common symbol. We turn the large common symbol into a
6261 && h
->root
.type
== bfd_link_hash_common
6263 && bfd_is_com_section (*psec
)
6266 if (sym
->st_shndx
== SHN_COMMON
6267 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6269 h
->root
.u
.c
.p
->section
6270 = bfd_make_section_old_way (oldbfd
, "COMMON");
6271 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6273 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6274 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6275 *psec
= bfd_com_section_ptr
;
6282 elf_x86_64_additional_program_headers (bfd
*abfd
,
6283 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6288 /* Check to see if we need a large readonly segment. */
6289 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6290 if (s
&& (s
->flags
& SEC_LOAD
))
6293 /* Check to see if we need a large data segment. Since .lbss sections
6294 is placed right after the .bss section, there should be no need for
6295 a large data segment just because of .lbss. */
6296 s
= bfd_get_section_by_name (abfd
, ".ldata");
6297 if (s
&& (s
->flags
& SEC_LOAD
))
6303 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6306 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6308 if (h
->plt
.offset
!= (bfd_vma
) -1
6310 && !h
->pointer_equality_needed
)
6313 return _bfd_elf_hash_symbol (h
);
6316 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6319 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6320 const bfd_target
*output
)
6322 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6323 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6324 && _bfd_elf_relocs_compatible (input
, output
));
6327 static const struct bfd_elf_special_section
6328 elf_x86_64_special_sections
[]=
6330 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6331 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6332 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6333 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6334 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6335 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6336 { NULL
, 0, 0, 0, 0 }
6339 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6340 #define TARGET_LITTLE_NAME "elf64-x86-64"
6341 #define ELF_ARCH bfd_arch_i386
6342 #define ELF_TARGET_ID X86_64_ELF_DATA
6343 #define ELF_MACHINE_CODE EM_X86_64
6344 #define ELF_MAXPAGESIZE 0x200000
6345 #define ELF_MINPAGESIZE 0x1000
6346 #define ELF_COMMONPAGESIZE 0x1000
6348 #define elf_backend_can_gc_sections 1
6349 #define elf_backend_can_refcount 1
6350 #define elf_backend_want_got_plt 1
6351 #define elf_backend_plt_readonly 1
6352 #define elf_backend_want_plt_sym 0
6353 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6354 #define elf_backend_rela_normal 1
6355 #define elf_backend_plt_alignment 4
6356 #define elf_backend_extern_protected_data 1
6358 #define elf_info_to_howto elf_x86_64_info_to_howto
6360 #define bfd_elf64_bfd_link_hash_table_create \
6361 elf_x86_64_link_hash_table_create
6362 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6363 #define bfd_elf64_bfd_reloc_name_lookup \
6364 elf_x86_64_reloc_name_lookup
6366 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6367 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6368 #define elf_backend_check_relocs elf_x86_64_check_relocs
6369 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6370 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6371 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6372 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6373 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6374 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6375 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6376 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6378 #define elf_backend_write_core_note elf_x86_64_write_core_note
6380 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6381 #define elf_backend_relocate_section elf_x86_64_relocate_section
6382 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6383 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6384 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6385 #define elf_backend_object_p elf64_x86_64_elf_object_p
6386 #define bfd_elf64_mkobject elf_x86_64_mkobject
6387 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6389 #define elf_backend_section_from_shdr \
6390 elf_x86_64_section_from_shdr
6392 #define elf_backend_section_from_bfd_section \
6393 elf_x86_64_elf_section_from_bfd_section
6394 #define elf_backend_add_symbol_hook \
6395 elf_x86_64_add_symbol_hook
6396 #define elf_backend_symbol_processing \
6397 elf_x86_64_symbol_processing
6398 #define elf_backend_common_section_index \
6399 elf_x86_64_common_section_index
6400 #define elf_backend_common_section \
6401 elf_x86_64_common_section
6402 #define elf_backend_common_definition \
6403 elf_x86_64_common_definition
6404 #define elf_backend_merge_symbol \
6405 elf_x86_64_merge_symbol
6406 #define elf_backend_special_sections \
6407 elf_x86_64_special_sections
6408 #define elf_backend_additional_program_headers \
6409 elf_x86_64_additional_program_headers
6410 #define elf_backend_hash_symbol \
6411 elf_x86_64_hash_symbol
6412 #define elf_backend_omit_section_dynsym \
6413 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6415 #include "elf64-target.h"
6417 /* CloudABI support. */
6419 #undef TARGET_LITTLE_SYM
6420 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6421 #undef TARGET_LITTLE_NAME
6422 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6425 #define ELF_OSABI ELFOSABI_CLOUDABI
6428 #define elf64_bed elf64_x86_64_cloudabi_bed
6430 #include "elf64-target.h"
6432 /* FreeBSD support. */
6434 #undef TARGET_LITTLE_SYM
6435 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6436 #undef TARGET_LITTLE_NAME
6437 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6440 #define ELF_OSABI ELFOSABI_FREEBSD
6443 #define elf64_bed elf64_x86_64_fbsd_bed
6445 #include "elf64-target.h"
6447 /* Solaris 2 support. */
6449 #undef TARGET_LITTLE_SYM
6450 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6451 #undef TARGET_LITTLE_NAME
6452 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6454 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6455 objects won't be recognized. */
6459 #define elf64_bed elf64_x86_64_sol2_bed
6461 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6463 #undef elf_backend_static_tls_alignment
6464 #define elf_backend_static_tls_alignment 16
6466 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6468 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6470 #undef elf_backend_want_plt_sym
6471 #define elf_backend_want_plt_sym 1
6473 #include "elf64-target.h"
6475 /* Native Client support. */
6478 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6480 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6481 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6485 #undef TARGET_LITTLE_SYM
6486 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6487 #undef TARGET_LITTLE_NAME
6488 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6490 #define elf64_bed elf64_x86_64_nacl_bed
6492 #undef ELF_MAXPAGESIZE
6493 #undef ELF_MINPAGESIZE
6494 #undef ELF_COMMONPAGESIZE
6495 #define ELF_MAXPAGESIZE 0x10000
6496 #define ELF_MINPAGESIZE 0x10000
6497 #define ELF_COMMONPAGESIZE 0x10000
6499 /* Restore defaults. */
6501 #undef elf_backend_static_tls_alignment
6502 #undef elf_backend_want_plt_sym
6503 #define elf_backend_want_plt_sym 0
6505 /* NaCl uses substantially different PLT entries for the same effects. */
6507 #undef elf_backend_plt_alignment
6508 #define elf_backend_plt_alignment 5
6509 #define NACL_PLT_ENTRY_SIZE 64
6510 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6512 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6514 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6515 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6516 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6517 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6518 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6520 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6521 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6523 /* 32 bytes of nop to pad out to the standard size. */
6524 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6525 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6526 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6527 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6528 0x66, /* excess data32 prefix */
6532 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6534 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6535 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6536 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6537 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6539 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6540 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6541 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6543 /* Lazy GOT entries point here (32-byte aligned). */
6544 0x68, /* pushq immediate */
6545 0, 0, 0, 0, /* replaced with index into relocation table. */
6546 0xe9, /* jmp relative */
6547 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6549 /* 22 bytes of nop to pad out to the standard size. */
6550 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6551 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6552 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6555 /* .eh_frame covering the .plt section. */
6557 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6559 #if (PLT_CIE_LENGTH != 20 \
6560 || PLT_FDE_LENGTH != 36 \
6561 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6562 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6563 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6565 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6566 0, 0, 0, 0, /* CIE ID */
6567 1, /* CIE version */
6568 'z', 'R', 0, /* Augmentation string */
6569 1, /* Code alignment factor */
6570 0x78, /* Data alignment factor */
6571 16, /* Return address column */
6572 1, /* Augmentation size */
6573 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6574 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6575 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6576 DW_CFA_nop
, DW_CFA_nop
,
6578 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6579 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6580 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6581 0, 0, 0, 0, /* .plt size goes here */
6582 0, /* Augmentation size */
6583 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6584 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6585 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6586 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6587 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6588 13, /* Block length */
6589 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6590 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6591 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6592 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6593 DW_CFA_nop
, DW_CFA_nop
6596 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6598 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6599 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6600 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6601 2, /* plt0_got1_offset */
6602 9, /* plt0_got2_offset */
6603 13, /* plt0_got2_insn_end */
6604 3, /* plt_got_offset */
6605 33, /* plt_reloc_offset */
6606 38, /* plt_plt_offset */
6607 7, /* plt_got_insn_size */
6608 42, /* plt_plt_insn_end */
6609 32, /* plt_lazy_offset */
6610 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6611 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6614 #undef elf_backend_arch_data
6615 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6617 #undef elf_backend_object_p
6618 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6619 #undef elf_backend_modify_segment_map
6620 #define elf_backend_modify_segment_map nacl_modify_segment_map
6621 #undef elf_backend_modify_program_headers
6622 #define elf_backend_modify_program_headers nacl_modify_program_headers
6623 #undef elf_backend_final_write_processing
6624 #define elf_backend_final_write_processing nacl_final_write_processing
6626 #include "elf64-target.h"
6628 /* Native Client x32 support. */
6631 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6633 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6634 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6638 #undef TARGET_LITTLE_SYM
6639 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6640 #undef TARGET_LITTLE_NAME
6641 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6643 #define elf32_bed elf32_x86_64_nacl_bed
6645 #define bfd_elf32_bfd_link_hash_table_create \
6646 elf_x86_64_link_hash_table_create
6647 #define bfd_elf32_bfd_reloc_type_lookup \
6648 elf_x86_64_reloc_type_lookup
6649 #define bfd_elf32_bfd_reloc_name_lookup \
6650 elf_x86_64_reloc_name_lookup
6651 #define bfd_elf32_mkobject \
6653 #define bfd_elf32_get_synthetic_symtab \
6654 elf_x86_64_get_synthetic_symtab
6656 #undef elf_backend_object_p
6657 #define elf_backend_object_p \
6658 elf32_x86_64_nacl_elf_object_p
6660 #undef elf_backend_bfd_from_remote_memory
6661 #define elf_backend_bfd_from_remote_memory \
6662 _bfd_elf32_bfd_from_remote_memory
6664 #undef elf_backend_size_info
6665 #define elf_backend_size_info \
6666 _bfd_elf32_size_info
6668 #include "elf32-target.h"
6670 /* Restore defaults. */
6671 #undef elf_backend_object_p
6672 #define elf_backend_object_p elf64_x86_64_elf_object_p
6673 #undef elf_backend_bfd_from_remote_memory
6674 #undef elf_backend_size_info
6675 #undef elf_backend_modify_segment_map
6676 #undef elf_backend_modify_program_headers
6677 #undef elf_backend_final_write_processing
6679 /* Intel L1OM support. */
6682 elf64_l1om_elf_object_p (bfd
*abfd
)
6684 /* Set the right machine number for an L1OM elf64 file. */
6685 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6689 #undef TARGET_LITTLE_SYM
6690 #define TARGET_LITTLE_SYM l1om_elf64_vec
6691 #undef TARGET_LITTLE_NAME
6692 #define TARGET_LITTLE_NAME "elf64-l1om"
6694 #define ELF_ARCH bfd_arch_l1om
6696 #undef ELF_MACHINE_CODE
6697 #define ELF_MACHINE_CODE EM_L1OM
6702 #define elf64_bed elf64_l1om_bed
6704 #undef elf_backend_object_p
6705 #define elf_backend_object_p elf64_l1om_elf_object_p
6707 /* Restore defaults. */
6708 #undef ELF_MAXPAGESIZE
6709 #undef ELF_MINPAGESIZE
6710 #undef ELF_COMMONPAGESIZE
6711 #define ELF_MAXPAGESIZE 0x200000
6712 #define ELF_MINPAGESIZE 0x1000
6713 #define ELF_COMMONPAGESIZE 0x1000
6714 #undef elf_backend_plt_alignment
6715 #define elf_backend_plt_alignment 4
6716 #undef elf_backend_arch_data
6717 #define elf_backend_arch_data &elf_x86_64_arch_bed
6719 #include "elf64-target.h"
6721 /* FreeBSD L1OM support. */
6723 #undef TARGET_LITTLE_SYM
6724 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6725 #undef TARGET_LITTLE_NAME
6726 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6729 #define ELF_OSABI ELFOSABI_FREEBSD
6732 #define elf64_bed elf64_l1om_fbsd_bed
6734 #include "elf64-target.h"
6736 /* Intel K1OM support. */
6739 elf64_k1om_elf_object_p (bfd
*abfd
)
6741 /* Set the right machine number for an K1OM elf64 file. */
6742 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6746 #undef TARGET_LITTLE_SYM
6747 #define TARGET_LITTLE_SYM k1om_elf64_vec
6748 #undef TARGET_LITTLE_NAME
6749 #define TARGET_LITTLE_NAME "elf64-k1om"
6751 #define ELF_ARCH bfd_arch_k1om
6753 #undef ELF_MACHINE_CODE
6754 #define ELF_MACHINE_CODE EM_K1OM
6759 #define elf64_bed elf64_k1om_bed
6761 #undef elf_backend_object_p
6762 #define elf_backend_object_p elf64_k1om_elf_object_p
6764 #undef elf_backend_static_tls_alignment
6766 #undef elf_backend_want_plt_sym
6767 #define elf_backend_want_plt_sym 0
6769 #include "elf64-target.h"
6771 /* FreeBSD K1OM support. */
6773 #undef TARGET_LITTLE_SYM
6774 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6775 #undef TARGET_LITTLE_NAME
6776 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6779 #define ELF_OSABI ELFOSABI_FREEBSD
6782 #define elf64_bed elf64_k1om_fbsd_bed
6784 #include "elf64-target.h"
6786 /* 32bit x86-64 support. */
6788 #undef TARGET_LITTLE_SYM
6789 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6790 #undef TARGET_LITTLE_NAME
6791 #define TARGET_LITTLE_NAME "elf32-x86-64"
6795 #define ELF_ARCH bfd_arch_i386
6797 #undef ELF_MACHINE_CODE
6798 #define ELF_MACHINE_CODE EM_X86_64
6802 #undef elf_backend_object_p
6803 #define elf_backend_object_p \
6804 elf32_x86_64_elf_object_p
6806 #undef elf_backend_bfd_from_remote_memory
6807 #define elf_backend_bfd_from_remote_memory \
6808 _bfd_elf32_bfd_from_remote_memory
6810 #undef elf_backend_size_info
6811 #define elf_backend_size_info \
6812 _bfd_elf32_size_info
6814 #include "elf32-target.h"