1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2014 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 "elf/x86-64.h"
41 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
42 #define MINUS_ONE (~ (bfd_vma) 0)
44 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
45 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
46 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
47 since they are the same. */
49 #define ABI_64_P(abfd) \
50 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52 /* The relocation "howto" table. Order of fields:
53 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
54 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
55 static reloc_howto_type x86_64_elf_howto_table
[] =
57 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
58 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
60 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
61 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
63 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
64 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
67 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
69 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
70 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
72 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
73 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
76 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
78 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
79 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
81 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
82 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
84 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
85 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
87 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
88 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
90 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
91 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
93 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
94 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
95 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
96 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
97 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
99 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
100 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
101 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
102 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
104 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
105 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
107 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
108 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
110 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
111 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
113 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
114 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
116 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
117 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
119 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
120 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
122 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
123 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
125 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
126 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
128 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
129 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
130 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
131 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
132 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
133 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
134 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
135 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
137 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
138 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
140 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
141 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
142 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
143 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
144 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
146 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
147 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
149 HOWTO(R_X86_64_SIZE32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
150 bfd_elf_generic_reloc
, "R_X86_64_SIZE32", FALSE
, 0xffffffff, 0xffffffff,
152 HOWTO(R_X86_64_SIZE64
, 0, 4, 64, FALSE
, 0, complain_overflow_unsigned
,
153 bfd_elf_generic_reloc
, "R_X86_64_SIZE64", FALSE
, MINUS_ONE
, MINUS_ONE
,
155 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
156 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
157 "R_X86_64_GOTPC32_TLSDESC",
158 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
159 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
160 complain_overflow_dont
, bfd_elf_generic_reloc
,
161 "R_X86_64_TLSDESC_CALL",
163 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
164 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
166 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
167 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
168 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
170 HOWTO(R_X86_64_RELATIVE64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
171 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE64", FALSE
, MINUS_ONE
,
173 HOWTO(R_X86_64_PC32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
174 bfd_elf_generic_reloc
, "R_X86_64_PC32_BND", FALSE
, 0xffffffff, 0xffffffff,
176 HOWTO(R_X86_64_PLT32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
177 bfd_elf_generic_reloc
, "R_X86_64_PLT32_BND", FALSE
, 0xffffffff, 0xffffffff,
180 /* We have a gap in the reloc numbers here.
181 R_X86_64_standard counts the number up to this point, and
182 R_X86_64_vt_offset is the value to subtract from a reloc type of
183 R_X86_64_GNU_VT* to form an index into this table. */
184 #define R_X86_64_standard (R_X86_64_PLT32_BND + 1)
185 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
187 /* GNU extension to record C++ vtable hierarchy. */
188 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
189 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
191 /* GNU extension to record C++ vtable member usage. */
192 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
193 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
196 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
197 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
198 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
202 #define IS_X86_64_PCREL_TYPE(TYPE) \
203 ( ((TYPE) == R_X86_64_PC8) \
204 || ((TYPE) == R_X86_64_PC16) \
205 || ((TYPE) == R_X86_64_PC32) \
206 || ((TYPE) == R_X86_64_PC32_BND) \
207 || ((TYPE) == R_X86_64_PC64))
209 /* Map BFD relocs to the x86_64 elf relocs. */
212 bfd_reloc_code_real_type bfd_reloc_val
;
213 unsigned char elf_reloc_val
;
216 static const struct elf_reloc_map x86_64_reloc_map
[] =
218 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
219 { BFD_RELOC_64
, R_X86_64_64
, },
220 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
221 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
222 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
223 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
224 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
225 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
226 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
227 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
228 { BFD_RELOC_32
, R_X86_64_32
, },
229 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
230 { BFD_RELOC_16
, R_X86_64_16
, },
231 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
232 { BFD_RELOC_8
, R_X86_64_8
, },
233 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
234 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
235 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
236 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
237 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
238 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
239 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
240 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
241 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
242 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
243 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
244 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
245 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
246 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
247 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
248 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
249 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
250 { BFD_RELOC_SIZE32
, R_X86_64_SIZE32
, },
251 { BFD_RELOC_SIZE64
, R_X86_64_SIZE64
, },
252 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
253 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
254 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
255 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
256 { BFD_RELOC_X86_64_PC32_BND
, R_X86_64_PC32_BND
,},
257 { BFD_RELOC_X86_64_PLT32_BND
, R_X86_64_PLT32_BND
,},
258 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
259 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
262 static reloc_howto_type
*
263 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
267 if (r_type
== (unsigned int) R_X86_64_32
)
272 i
= ARRAY_SIZE (x86_64_elf_howto_table
) - 1;
274 else if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
275 || r_type
>= (unsigned int) R_X86_64_max
)
277 if (r_type
>= (unsigned int) R_X86_64_standard
)
279 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
281 r_type
= R_X86_64_NONE
;
286 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
287 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
288 return &x86_64_elf_howto_table
[i
];
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type
*
293 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
294 bfd_reloc_code_real_type code
)
298 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
301 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
302 return elf_x86_64_rtype_to_howto (abfd
,
303 x86_64_reloc_map
[i
].elf_reloc_val
);
308 static reloc_howto_type
*
309 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
314 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type
*reloc
318 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
319 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
323 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
324 if (x86_64_elf_howto_table
[i
].name
!= NULL
325 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
326 return &x86_64_elf_howto_table
[i
];
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
334 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
335 Elf_Internal_Rela
*dst
)
339 r_type
= ELF32_R_TYPE (dst
->r_info
);
340 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
341 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
344 /* Support for core dump NOTE sections. */
346 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
351 switch (note
->descsz
)
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
358 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
361 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
371 elf_tdata (abfd
)->core
->signal
372 = bfd_get_16 (abfd
, note
->descdata
+ 12);
375 elf_tdata (abfd
)->core
->lwpid
376 = bfd_get_32 (abfd
, note
->descdata
+ 32);
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
387 size
, note
->descpos
+ offset
);
391 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
393 switch (note
->descsz
)
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd
)->core
->pid
400 = bfd_get_32 (abfd
, note
->descdata
+ 12);
401 elf_tdata (abfd
)->core
->program
402 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
403 elf_tdata (abfd
)->core
->command
404 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd
)->core
->pid
409 = bfd_get_32 (abfd
, note
->descdata
+ 24);
410 elf_tdata (abfd
)->core
->program
411 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
412 elf_tdata (abfd
)->core
->command
413 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
421 char *command
= elf_tdata (abfd
)->core
->command
;
422 int n
= strlen (command
);
424 if (0 < n
&& command
[n
- 1] == ' ')
425 command
[n
- 1] = '\0';
433 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
436 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
438 const char *fname
, *psargs
;
449 va_start (ap
, note_type
);
450 fname
= va_arg (ap
, const char *);
451 psargs
= va_arg (ap
, const char *);
454 if (bed
->s
->elfclass
== ELFCLASS32
)
457 memset (&data
, 0, sizeof (data
));
458 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
459 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
460 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
461 &data
, sizeof (data
));
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 va_start (ap
, note_type
);
476 pid
= va_arg (ap
, long);
477 cursig
= va_arg (ap
, int);
478 gregs
= va_arg (ap
, const void *);
481 if (bed
->s
->elfclass
== ELFCLASS32
)
483 if (bed
->elf_machine_code
== EM_X86_64
)
485 prstatusx32_t prstat
;
486 memset (&prstat
, 0, sizeof (prstat
));
488 prstat
.pr_cursig
= cursig
;
489 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
490 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
491 &prstat
, sizeof (prstat
));
496 memset (&prstat
, 0, sizeof (prstat
));
498 prstat
.pr_cursig
= cursig
;
499 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
500 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
501 &prstat
, sizeof (prstat
));
507 memset (&prstat
, 0, sizeof (prstat
));
509 prstat
.pr_cursig
= cursig
;
510 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
511 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
512 &prstat
, sizeof (prstat
));
519 /* Functions for the x86-64 ELF linker. */
521 /* The name of the dynamic interpreter. This is put in the .interp
524 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
525 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
527 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
528 copying dynamic variables from a shared lib into an app's dynbss
529 section, and instead use a dynamic relocation to point into the
531 #define ELIMINATE_COPY_RELOCS 1
533 /* The size in bytes of an entry in the global offset table. */
535 #define GOT_ENTRY_SIZE 8
537 /* The size in bytes of an entry in the procedure linkage table. */
539 #define PLT_ENTRY_SIZE 16
541 /* The first entry in a procedure linkage table looks like this. See the
542 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
544 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
546 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
547 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
548 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
551 /* Subsequent entries in a procedure linkage table look like this. */
553 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
555 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
556 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
557 0x68, /* pushq immediate */
558 0, 0, 0, 0, /* replaced with index into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
563 /* The first entry in a procedure linkage table with BND relocations
566 static const bfd_byte elf_x86_64_bnd_plt0_entry
[PLT_ENTRY_SIZE
] =
568 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
569 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
570 0x0f, 0x1f, 0 /* nopl (%rax) */
573 /* Subsequent entries for legacy branches in a procedure linkage table
574 with BND relocations look like this. */
576 static const bfd_byte elf_x86_64_legacy_plt_entry
[PLT_ENTRY_SIZE
] =
578 0x68, 0, 0, 0, 0, /* pushq immediate */
579 0xe9, 0, 0, 0, 0, /* jmpq relative */
580 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
583 /* Subsequent entries for branches with BND prefx in a procedure linkage
584 table with BND relocations look like this. */
586 static const bfd_byte elf_x86_64_bnd_plt_entry
[PLT_ENTRY_SIZE
] =
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
590 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
593 /* Entries for legacy branches in the second procedure linkage table
596 static const bfd_byte elf_x86_64_legacy_plt2_entry
[8] =
598 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
599 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* Entries for branches with BND prefix in the second procedure linkage
604 table look like this. */
606 static const bfd_byte elf_x86_64_bnd_plt2_entry
[8] =
608 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
613 /* .eh_frame covering the .plt section. */
615 static const bfd_byte elf_x86_64_eh_frame_plt
[] =
617 #define PLT_CIE_LENGTH 20
618 #define PLT_FDE_LENGTH 36
619 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
620 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
621 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
622 0, 0, 0, 0, /* CIE ID */
624 'z', 'R', 0, /* Augmentation string */
625 1, /* Code alignment factor */
626 0x78, /* Data alignment factor */
627 16, /* Return address column */
628 1, /* Augmentation size */
629 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
630 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
631 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
632 DW_CFA_nop
, DW_CFA_nop
,
634 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
635 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
636 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
637 0, 0, 0, 0, /* .plt size goes here */
638 0, /* Augmentation size */
639 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
640 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
641 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
642 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
643 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
644 11, /* Block length */
645 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
646 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
647 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
648 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
649 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
652 /* Architecture-specific backend data for x86-64. */
654 struct elf_x86_64_backend_data
656 /* Templates for the initial PLT entry and for subsequent entries. */
657 const bfd_byte
*plt0_entry
;
658 const bfd_byte
*plt_entry
;
659 unsigned int plt_entry_size
; /* Size of each PLT entry. */
661 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
662 unsigned int plt0_got1_offset
;
663 unsigned int plt0_got2_offset
;
665 /* Offset of the end of the PC-relative instruction containing
667 unsigned int plt0_got2_insn_end
;
669 /* Offsets into plt_entry that are to be replaced with... */
670 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
671 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
672 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
674 /* Length of the PC-relative instruction containing plt_got_offset. */
675 unsigned int plt_got_insn_size
;
677 /* Offset of the end of the PC-relative jump to plt0_entry. */
678 unsigned int plt_plt_insn_end
;
680 /* Offset into plt_entry where the initial value of the GOT entry points. */
681 unsigned int plt_lazy_offset
;
683 /* .eh_frame covering the .plt section. */
684 const bfd_byte
*eh_frame_plt
;
685 unsigned int eh_frame_plt_size
;
688 #define get_elf_x86_64_arch_data(bed) \
689 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
691 #define get_elf_x86_64_backend_data(abfd) \
692 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
694 #define GET_PLT_ENTRY_SIZE(abfd) \
695 get_elf_x86_64_backend_data (abfd)->plt_entry_size
697 /* These are the standard parameters. */
698 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed
=
700 elf_x86_64_plt0_entry
, /* plt0_entry */
701 elf_x86_64_plt_entry
, /* plt_entry */
702 sizeof (elf_x86_64_plt_entry
), /* plt_entry_size */
703 2, /* plt0_got1_offset */
704 8, /* plt0_got2_offset */
705 12, /* plt0_got2_insn_end */
706 2, /* plt_got_offset */
707 7, /* plt_reloc_offset */
708 12, /* plt_plt_offset */
709 6, /* plt_got_insn_size */
710 PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
711 6, /* plt_lazy_offset */
712 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
713 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
716 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed
=
718 elf_x86_64_bnd_plt0_entry
, /* plt0_entry */
719 elf_x86_64_bnd_plt_entry
, /* plt_entry */
720 sizeof (elf_x86_64_bnd_plt_entry
), /* plt_entry_size */
721 2, /* plt0_got1_offset */
722 1+8, /* plt0_got2_offset */
723 1+12, /* plt0_got2_insn_end */
724 1+2, /* plt_got_offset */
725 1, /* plt_reloc_offset */
726 7, /* plt_plt_offset */
727 1+6, /* plt_got_insn_size */
728 11, /* plt_plt_insn_end */
729 0, /* plt_lazy_offset */
730 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
731 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
734 #define elf_backend_arch_data &elf_x86_64_arch_bed
736 /* x86-64 ELF linker hash entry. */
738 struct elf_x86_64_link_hash_entry
740 struct elf_link_hash_entry elf
;
742 /* Track dynamic relocs copied for this symbol. */
743 struct elf_dyn_relocs
*dyn_relocs
;
745 #define GOT_UNKNOWN 0
749 #define GOT_TLS_GDESC 4
750 #define GOT_TLS_GD_BOTH_P(type) \
751 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
752 #define GOT_TLS_GD_P(type) \
753 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
754 #define GOT_TLS_GDESC_P(type) \
755 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
756 #define GOT_TLS_GD_ANY_P(type) \
757 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
758 unsigned char tls_type
;
760 /* TRUE if symbol has at least one BND relocation. */
761 bfd_boolean has_bnd_reloc
;
763 /* Information about the second PLT entry. Filled when has_bnd_reloc is
765 union gotplt_union plt_bnd
;
767 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
768 starting at the end of the jump table. */
772 #define elf_x86_64_hash_entry(ent) \
773 ((struct elf_x86_64_link_hash_entry *)(ent))
775 struct elf_x86_64_obj_tdata
777 struct elf_obj_tdata root
;
779 /* tls_type for each local got entry. */
780 char *local_got_tls_type
;
782 /* GOTPLT entries for TLS descriptors. */
783 bfd_vma
*local_tlsdesc_gotent
;
786 #define elf_x86_64_tdata(abfd) \
787 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
789 #define elf_x86_64_local_got_tls_type(abfd) \
790 (elf_x86_64_tdata (abfd)->local_got_tls_type)
792 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
793 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
795 #define is_x86_64_elf(bfd) \
796 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
797 && elf_tdata (bfd) != NULL \
798 && elf_object_id (bfd) == X86_64_ELF_DATA)
801 elf_x86_64_mkobject (bfd
*abfd
)
803 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
807 /* x86-64 ELF linker hash table. */
809 struct elf_x86_64_link_hash_table
811 struct elf_link_hash_table elf
;
813 /* Short-cuts to get to dynamic linker sections. */
816 asection
*plt_eh_frame
;
821 bfd_signed_vma refcount
;
825 /* The amount of space used by the jump slots in the GOT. */
826 bfd_vma sgotplt_jump_table_size
;
828 /* Small local sym cache. */
829 struct sym_cache sym_cache
;
831 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
832 bfd_vma (*r_sym
) (bfd_vma
);
833 unsigned int pointer_r_type
;
834 const char *dynamic_interpreter
;
835 int dynamic_interpreter_size
;
837 /* _TLS_MODULE_BASE_ symbol. */
838 struct bfd_link_hash_entry
*tls_module_base
;
840 /* Used by local STT_GNU_IFUNC symbols. */
841 htab_t loc_hash_table
;
842 void * loc_hash_memory
;
844 /* The offset into splt of the PLT entry for the TLS descriptor
845 resolver. Special values are 0, if not necessary (or not found
846 to be necessary yet), and -1 if needed but not determined
849 /* The offset into sgot of the GOT entry used by the PLT entry
853 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
854 bfd_vma next_jump_slot_index
;
855 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
856 bfd_vma next_irelative_index
;
859 /* Get the x86-64 ELF linker hash table from a link_info structure. */
861 #define elf_x86_64_hash_table(p) \
862 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
863 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
865 #define elf_x86_64_compute_jump_table_size(htab) \
866 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
868 /* Create an entry in an x86-64 ELF linker hash table. */
870 static struct bfd_hash_entry
*
871 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
872 struct bfd_hash_table
*table
,
875 /* Allocate the structure if it has not already been allocated by a
879 entry
= (struct bfd_hash_entry
*)
880 bfd_hash_allocate (table
,
881 sizeof (struct elf_x86_64_link_hash_entry
));
886 /* Call the allocation method of the superclass. */
887 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
890 struct elf_x86_64_link_hash_entry
*eh
;
892 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
893 eh
->dyn_relocs
= NULL
;
894 eh
->tls_type
= GOT_UNKNOWN
;
895 eh
->has_bnd_reloc
= FALSE
;
896 eh
->plt_bnd
.offset
= (bfd_vma
) -1;
897 eh
->tlsdesc_got
= (bfd_vma
) -1;
903 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
904 for local symbol so that we can handle local STT_GNU_IFUNC symbols
905 as global symbol. We reuse indx and dynstr_index for local symbol
906 hash since they aren't used by global symbols in this backend. */
909 elf_x86_64_local_htab_hash (const void *ptr
)
911 struct elf_link_hash_entry
*h
912 = (struct elf_link_hash_entry
*) ptr
;
913 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
916 /* Compare local hash entries. */
919 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
921 struct elf_link_hash_entry
*h1
922 = (struct elf_link_hash_entry
*) ptr1
;
923 struct elf_link_hash_entry
*h2
924 = (struct elf_link_hash_entry
*) ptr2
;
926 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
929 /* Find and/or create a hash entry for local symbol. */
931 static struct elf_link_hash_entry
*
932 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
933 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
936 struct elf_x86_64_link_hash_entry e
, *ret
;
937 asection
*sec
= abfd
->sections
;
938 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
939 htab
->r_sym (rel
->r_info
));
942 e
.elf
.indx
= sec
->id
;
943 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
944 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
945 create
? INSERT
: NO_INSERT
);
952 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
956 ret
= (struct elf_x86_64_link_hash_entry
*)
957 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
958 sizeof (struct elf_x86_64_link_hash_entry
));
961 memset (ret
, 0, sizeof (*ret
));
962 ret
->elf
.indx
= sec
->id
;
963 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
964 ret
->elf
.dynindx
= -1;
970 /* Destroy an X86-64 ELF linker hash table. */
973 elf_x86_64_link_hash_table_free (bfd
*obfd
)
975 struct elf_x86_64_link_hash_table
*htab
976 = (struct elf_x86_64_link_hash_table
*) obfd
->link
.hash
;
978 if (htab
->loc_hash_table
)
979 htab_delete (htab
->loc_hash_table
);
980 if (htab
->loc_hash_memory
)
981 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
982 _bfd_elf_link_hash_table_free (obfd
);
985 /* Create an X86-64 ELF linker hash table. */
987 static struct bfd_link_hash_table
*
988 elf_x86_64_link_hash_table_create (bfd
*abfd
)
990 struct elf_x86_64_link_hash_table
*ret
;
991 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
993 ret
= (struct elf_x86_64_link_hash_table
*) bfd_zmalloc (amt
);
997 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
998 elf_x86_64_link_hash_newfunc
,
999 sizeof (struct elf_x86_64_link_hash_entry
),
1006 if (ABI_64_P (abfd
))
1008 ret
->r_info
= elf64_r_info
;
1009 ret
->r_sym
= elf64_r_sym
;
1010 ret
->pointer_r_type
= R_X86_64_64
;
1011 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
1012 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
1016 ret
->r_info
= elf32_r_info
;
1017 ret
->r_sym
= elf32_r_sym
;
1018 ret
->pointer_r_type
= R_X86_64_32
;
1019 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
1020 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
1023 ret
->loc_hash_table
= htab_try_create (1024,
1024 elf_x86_64_local_htab_hash
,
1025 elf_x86_64_local_htab_eq
,
1027 ret
->loc_hash_memory
= objalloc_create ();
1028 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1030 elf_x86_64_link_hash_table_free (abfd
);
1033 ret
->elf
.root
.hash_table_free
= elf_x86_64_link_hash_table_free
;
1035 return &ret
->elf
.root
;
1038 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1039 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1043 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
1044 struct bfd_link_info
*info
)
1046 struct elf_x86_64_link_hash_table
*htab
;
1048 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1051 htab
= elf_x86_64_hash_table (info
);
1055 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
1057 htab
->srelbss
= bfd_get_linker_section (dynobj
, ".rela.bss");
1060 || (!info
->shared
&& !htab
->srelbss
))
1063 if (!info
->no_ld_generated_unwind_info
1064 && htab
->plt_eh_frame
== NULL
1065 && htab
->elf
.splt
!= NULL
)
1067 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1068 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1069 | SEC_LINKER_CREATED
);
1071 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1072 if (htab
->plt_eh_frame
== NULL
1073 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
1079 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1082 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1083 struct elf_link_hash_entry
*dir
,
1084 struct elf_link_hash_entry
*ind
)
1086 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1088 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1089 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1091 if (!edir
->has_bnd_reloc
)
1092 edir
->has_bnd_reloc
= eind
->has_bnd_reloc
;
1094 if (eind
->dyn_relocs
!= NULL
)
1096 if (edir
->dyn_relocs
!= NULL
)
1098 struct elf_dyn_relocs
**pp
;
1099 struct elf_dyn_relocs
*p
;
1101 /* Add reloc counts against the indirect sym to the direct sym
1102 list. Merge any entries against the same section. */
1103 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1105 struct elf_dyn_relocs
*q
;
1107 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1108 if (q
->sec
== p
->sec
)
1110 q
->pc_count
+= p
->pc_count
;
1111 q
->count
+= p
->count
;
1118 *pp
= edir
->dyn_relocs
;
1121 edir
->dyn_relocs
= eind
->dyn_relocs
;
1122 eind
->dyn_relocs
= NULL
;
1125 if (ind
->root
.type
== bfd_link_hash_indirect
1126 && dir
->got
.refcount
<= 0)
1128 edir
->tls_type
= eind
->tls_type
;
1129 eind
->tls_type
= GOT_UNKNOWN
;
1132 if (ELIMINATE_COPY_RELOCS
1133 && ind
->root
.type
!= bfd_link_hash_indirect
1134 && dir
->dynamic_adjusted
)
1136 /* If called to transfer flags for a weakdef during processing
1137 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1138 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1139 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1140 dir
->ref_regular
|= ind
->ref_regular
;
1141 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1142 dir
->needs_plt
|= ind
->needs_plt
;
1143 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1146 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1150 elf64_x86_64_elf_object_p (bfd
*abfd
)
1152 /* Set the right machine number for an x86-64 elf64 file. */
1153 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1158 elf32_x86_64_elf_object_p (bfd
*abfd
)
1160 /* Set the right machine number for an x86-64 elf32 file. */
1161 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1165 /* Return TRUE if the TLS access code sequence support transition
1169 elf_x86_64_check_tls_transition (bfd
*abfd
,
1170 struct bfd_link_info
*info
,
1173 Elf_Internal_Shdr
*symtab_hdr
,
1174 struct elf_link_hash_entry
**sym_hashes
,
1175 unsigned int r_type
,
1176 const Elf_Internal_Rela
*rel
,
1177 const Elf_Internal_Rela
*relend
)
1180 unsigned long r_symndx
;
1181 bfd_boolean largepic
= FALSE
;
1182 struct elf_link_hash_entry
*h
;
1184 struct elf_x86_64_link_hash_table
*htab
;
1186 /* Get the section contents. */
1187 if (contents
== NULL
)
1189 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1190 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1193 /* FIXME: How to better handle error condition? */
1194 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1197 /* Cache the section contents for elf_link_input_bfd. */
1198 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1202 htab
= elf_x86_64_hash_table (info
);
1203 offset
= rel
->r_offset
;
1206 case R_X86_64_TLSGD
:
1207 case R_X86_64_TLSLD
:
1208 if ((rel
+ 1) >= relend
)
1211 if (r_type
== R_X86_64_TLSGD
)
1213 /* Check transition from GD access model. For 64bit, only
1214 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1215 .word 0x6666; rex64; call __tls_get_addr
1216 can transit to different access model. For 32bit, only
1217 leaq foo@tlsgd(%rip), %rdi
1218 .word 0x6666; rex64; call __tls_get_addr
1219 can transit to different access model. For largepic
1221 leaq foo@tlsgd(%rip), %rdi
1222 movabsq $__tls_get_addr@pltoff, %rax
1226 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1227 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1229 if ((offset
+ 12) > sec
->size
)
1232 if (memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1234 if (!ABI_64_P (abfd
)
1235 || (offset
+ 19) > sec
->size
1237 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0
1238 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1239 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1244 else if (ABI_64_P (abfd
))
1247 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1253 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1259 /* Check transition from LD access model. Only
1260 leaq foo@tlsld(%rip), %rdi;
1262 can transit to different access model. For largepic
1264 leaq foo@tlsld(%rip), %rdi
1265 movabsq $__tls_get_addr@pltoff, %rax
1269 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1271 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1274 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1277 if (0xe8 != *(contents
+ offset
+ 4))
1279 if (!ABI_64_P (abfd
)
1280 || (offset
+ 19) > sec
->size
1281 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1282 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1289 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1290 if (r_symndx
< symtab_hdr
->sh_info
)
1293 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1294 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1295 may be versioned. */
1297 && h
->root
.root
.string
!= NULL
1299 ? ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
1300 : (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1301 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
))
1302 && (strncmp (h
->root
.root
.string
,
1303 "__tls_get_addr", 14) == 0));
1305 case R_X86_64_GOTTPOFF
:
1306 /* Check transition from IE access model:
1307 mov foo@gottpoff(%rip), %reg
1308 add foo@gottpoff(%rip), %reg
1311 /* Check REX prefix first. */
1312 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1314 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1315 if (val
!= 0x48 && val
!= 0x4c)
1317 /* X32 may have 0x44 REX prefix or no REX prefix. */
1318 if (ABI_64_P (abfd
))
1324 /* X32 may not have any REX prefix. */
1325 if (ABI_64_P (abfd
))
1327 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1331 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1332 if (val
!= 0x8b && val
!= 0x03)
1335 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1336 return (val
& 0xc7) == 5;
1338 case R_X86_64_GOTPC32_TLSDESC
:
1339 /* Check transition from GDesc access model:
1340 leaq x@tlsdesc(%rip), %rax
1342 Make sure it's a leaq adding rip to a 32-bit offset
1343 into any register, although it's probably almost always
1346 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1349 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1350 if ((val
& 0xfb) != 0x48)
1353 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1356 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1357 return (val
& 0xc7) == 0x05;
1359 case R_X86_64_TLSDESC_CALL
:
1360 /* Check transition from GDesc access model:
1361 call *x@tlsdesc(%rax)
1363 if (offset
+ 2 <= sec
->size
)
1365 /* Make sure that it's a call *x@tlsdesc(%rax). */
1366 static const unsigned char call
[] = { 0xff, 0x10 };
1367 return memcmp (contents
+ offset
, call
, 2) == 0;
1377 /* Return TRUE if the TLS access transition is OK or no transition
1378 will be performed. Update R_TYPE if there is a transition. */
1381 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1382 asection
*sec
, bfd_byte
*contents
,
1383 Elf_Internal_Shdr
*symtab_hdr
,
1384 struct elf_link_hash_entry
**sym_hashes
,
1385 unsigned int *r_type
, int tls_type
,
1386 const Elf_Internal_Rela
*rel
,
1387 const Elf_Internal_Rela
*relend
,
1388 struct elf_link_hash_entry
*h
,
1389 unsigned long r_symndx
)
1391 unsigned int from_type
= *r_type
;
1392 unsigned int to_type
= from_type
;
1393 bfd_boolean check
= TRUE
;
1395 /* Skip TLS transition for functions. */
1397 && (h
->type
== STT_FUNC
1398 || h
->type
== STT_GNU_IFUNC
))
1403 case R_X86_64_TLSGD
:
1404 case R_X86_64_GOTPC32_TLSDESC
:
1405 case R_X86_64_TLSDESC_CALL
:
1406 case R_X86_64_GOTTPOFF
:
1407 if (info
->executable
)
1410 to_type
= R_X86_64_TPOFF32
;
1412 to_type
= R_X86_64_GOTTPOFF
;
1415 /* When we are called from elf_x86_64_relocate_section,
1416 CONTENTS isn't NULL and there may be additional transitions
1417 based on TLS_TYPE. */
1418 if (contents
!= NULL
)
1420 unsigned int new_to_type
= to_type
;
1422 if (info
->executable
1425 && tls_type
== GOT_TLS_IE
)
1426 new_to_type
= R_X86_64_TPOFF32
;
1428 if (to_type
== R_X86_64_TLSGD
1429 || to_type
== R_X86_64_GOTPC32_TLSDESC
1430 || to_type
== R_X86_64_TLSDESC_CALL
)
1432 if (tls_type
== GOT_TLS_IE
)
1433 new_to_type
= R_X86_64_GOTTPOFF
;
1436 /* We checked the transition before when we were called from
1437 elf_x86_64_check_relocs. We only want to check the new
1438 transition which hasn't been checked before. */
1439 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1440 to_type
= new_to_type
;
1445 case R_X86_64_TLSLD
:
1446 if (info
->executable
)
1447 to_type
= R_X86_64_TPOFF32
;
1454 /* Return TRUE if there is no transition. */
1455 if (from_type
== to_type
)
1458 /* Check if the transition can be performed. */
1460 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1461 symtab_hdr
, sym_hashes
,
1462 from_type
, rel
, relend
))
1464 reloc_howto_type
*from
, *to
;
1467 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1468 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1471 name
= h
->root
.root
.string
;
1474 struct elf_x86_64_link_hash_table
*htab
;
1476 htab
= elf_x86_64_hash_table (info
);
1481 Elf_Internal_Sym
*isym
;
1483 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1485 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1489 (*_bfd_error_handler
)
1490 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1491 "in section `%A' failed"),
1492 abfd
, sec
, from
->name
, to
->name
, name
,
1493 (unsigned long) rel
->r_offset
);
1494 bfd_set_error (bfd_error_bad_value
);
1502 /* Look through the relocs for a section during the first phase, and
1503 calculate needed space in the global offset table, procedure
1504 linkage table, and dynamic reloc sections. */
1507 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1509 const Elf_Internal_Rela
*relocs
)
1511 struct elf_x86_64_link_hash_table
*htab
;
1512 Elf_Internal_Shdr
*symtab_hdr
;
1513 struct elf_link_hash_entry
**sym_hashes
;
1514 const Elf_Internal_Rela
*rel
;
1515 const Elf_Internal_Rela
*rel_end
;
1518 if (info
->relocatable
)
1521 BFD_ASSERT (is_x86_64_elf (abfd
));
1523 htab
= elf_x86_64_hash_table (info
);
1527 symtab_hdr
= &elf_symtab_hdr (abfd
);
1528 sym_hashes
= elf_sym_hashes (abfd
);
1532 rel_end
= relocs
+ sec
->reloc_count
;
1533 for (rel
= relocs
; rel
< rel_end
; rel
++)
1535 unsigned int r_type
;
1536 unsigned long r_symndx
;
1537 struct elf_link_hash_entry
*h
;
1538 Elf_Internal_Sym
*isym
;
1540 bfd_boolean size_reloc
;
1542 r_symndx
= htab
->r_sym (rel
->r_info
);
1543 r_type
= ELF32_R_TYPE (rel
->r_info
);
1545 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1547 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1552 if (r_symndx
< symtab_hdr
->sh_info
)
1554 /* A local symbol. */
1555 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1560 /* Check relocation against local STT_GNU_IFUNC symbol. */
1561 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1563 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1568 /* Fake a STT_GNU_IFUNC symbol. */
1569 h
->type
= STT_GNU_IFUNC
;
1572 h
->forced_local
= 1;
1573 h
->root
.type
= bfd_link_hash_defined
;
1581 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1582 while (h
->root
.type
== bfd_link_hash_indirect
1583 || h
->root
.type
== bfd_link_hash_warning
)
1584 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1587 /* Check invalid x32 relocations. */
1588 if (!ABI_64_P (abfd
))
1594 case R_X86_64_DTPOFF64
:
1595 case R_X86_64_TPOFF64
:
1597 case R_X86_64_GOTOFF64
:
1598 case R_X86_64_GOT64
:
1599 case R_X86_64_GOTPCREL64
:
1600 case R_X86_64_GOTPC64
:
1601 case R_X86_64_GOTPLT64
:
1602 case R_X86_64_PLTOFF64
:
1605 name
= h
->root
.root
.string
;
1607 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1609 (*_bfd_error_handler
)
1610 (_("%B: relocation %s against symbol `%s' isn't "
1611 "supported in x32 mode"), abfd
,
1612 x86_64_elf_howto_table
[r_type
].name
, name
);
1613 bfd_set_error (bfd_error_bad_value
);
1621 /* Create the ifunc sections for static executables. If we
1622 never see an indirect function symbol nor we are building
1623 a static executable, those sections will be empty and
1624 won't appear in output. */
1630 case R_X86_64_PC32_BND
:
1631 case R_X86_64_PLT32_BND
:
1632 /* MPX PLT is supported only if elf_x86_64_arch_bed
1633 is used in 64-bit mode. */
1635 && (get_elf_x86_64_backend_data (abfd
)
1636 == &elf_x86_64_arch_bed
))
1638 elf_x86_64_hash_entry (h
)->has_bnd_reloc
= TRUE
;
1640 /* Create the second PLT for Intel MPX support. */
1641 if (htab
->plt_bnd
== NULL
)
1643 unsigned int plt_bnd_align
;
1644 const struct elf_backend_data
*bed
;
1646 bed
= get_elf_backend_data (info
->output_bfd
);
1647 switch (sizeof (elf_x86_64_bnd_plt2_entry
))
1659 if (htab
->elf
.dynobj
== NULL
)
1660 htab
->elf
.dynobj
= abfd
;
1662 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1664 (bed
->dynamic_sec_flags
1669 if (htab
->plt_bnd
== NULL
1670 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
1682 case R_X86_64_PLT32
:
1683 case R_X86_64_GOTPCREL
:
1684 case R_X86_64_GOTPCREL64
:
1685 if (htab
->elf
.dynobj
== NULL
)
1686 htab
->elf
.dynobj
= abfd
;
1687 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1692 /* It is referenced by a non-shared object. */
1694 h
->root
.non_ir_ref
= 1;
1697 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1698 symtab_hdr
, sym_hashes
,
1699 &r_type
, GOT_UNKNOWN
,
1700 rel
, rel_end
, h
, r_symndx
))
1705 case R_X86_64_TLSLD
:
1706 htab
->tls_ld_got
.refcount
+= 1;
1709 case R_X86_64_TPOFF32
:
1710 if (!info
->executable
&& ABI_64_P (abfd
))
1713 name
= h
->root
.root
.string
;
1715 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1717 (*_bfd_error_handler
)
1718 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1720 x86_64_elf_howto_table
[r_type
].name
, name
);
1721 bfd_set_error (bfd_error_bad_value
);
1726 case R_X86_64_GOTTPOFF
:
1727 if (!info
->executable
)
1728 info
->flags
|= DF_STATIC_TLS
;
1731 case R_X86_64_GOT32
:
1732 case R_X86_64_GOTPCREL
:
1733 case R_X86_64_TLSGD
:
1734 case R_X86_64_GOT64
:
1735 case R_X86_64_GOTPCREL64
:
1736 case R_X86_64_GOTPLT64
:
1737 case R_X86_64_GOTPC32_TLSDESC
:
1738 case R_X86_64_TLSDESC_CALL
:
1739 /* This symbol requires a global offset table entry. */
1741 int tls_type
, old_tls_type
;
1745 default: tls_type
= GOT_NORMAL
; break;
1746 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1747 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1748 case R_X86_64_GOTPC32_TLSDESC
:
1749 case R_X86_64_TLSDESC_CALL
:
1750 tls_type
= GOT_TLS_GDESC
; break;
1755 if (r_type
== R_X86_64_GOTPLT64
)
1757 /* This relocation indicates that we also need
1758 a PLT entry, as this is a function. We don't need
1759 a PLT entry for local symbols. */
1761 h
->plt
.refcount
+= 1;
1763 h
->got
.refcount
+= 1;
1764 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1768 bfd_signed_vma
*local_got_refcounts
;
1770 /* This is a global offset table entry for a local symbol. */
1771 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1772 if (local_got_refcounts
== NULL
)
1776 size
= symtab_hdr
->sh_info
;
1777 size
*= sizeof (bfd_signed_vma
)
1778 + sizeof (bfd_vma
) + sizeof (char);
1779 local_got_refcounts
= ((bfd_signed_vma
*)
1780 bfd_zalloc (abfd
, size
));
1781 if (local_got_refcounts
== NULL
)
1783 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1784 elf_x86_64_local_tlsdesc_gotent (abfd
)
1785 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1786 elf_x86_64_local_got_tls_type (abfd
)
1787 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1789 local_got_refcounts
[r_symndx
] += 1;
1791 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1794 /* If a TLS symbol is accessed using IE at least once,
1795 there is no point to use dynamic model for it. */
1796 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1797 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1798 || tls_type
!= GOT_TLS_IE
))
1800 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1801 tls_type
= old_tls_type
;
1802 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1803 && GOT_TLS_GD_ANY_P (tls_type
))
1804 tls_type
|= old_tls_type
;
1808 name
= h
->root
.root
.string
;
1810 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1812 (*_bfd_error_handler
)
1813 (_("%B: '%s' accessed both as normal and thread local symbol"),
1815 bfd_set_error (bfd_error_bad_value
);
1820 if (old_tls_type
!= tls_type
)
1823 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1825 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1830 case R_X86_64_GOTOFF64
:
1831 case R_X86_64_GOTPC32
:
1832 case R_X86_64_GOTPC64
:
1834 if (htab
->elf
.sgot
== NULL
)
1836 if (htab
->elf
.dynobj
== NULL
)
1837 htab
->elf
.dynobj
= abfd
;
1838 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1844 case R_X86_64_PLT32
:
1845 case R_X86_64_PLT32_BND
:
1846 /* This symbol requires a procedure linkage table entry. We
1847 actually build the entry in adjust_dynamic_symbol,
1848 because this might be a case of linking PIC code which is
1849 never referenced by a dynamic object, in which case we
1850 don't need to generate a procedure linkage table entry
1853 /* If this is a local symbol, we resolve it directly without
1854 creating a procedure linkage table entry. */
1859 h
->plt
.refcount
+= 1;
1862 case R_X86_64_PLTOFF64
:
1863 /* This tries to form the 'address' of a function relative
1864 to GOT. For global symbols we need a PLT entry. */
1868 h
->plt
.refcount
+= 1;
1872 case R_X86_64_SIZE32
:
1873 case R_X86_64_SIZE64
:
1878 if (!ABI_64_P (abfd
))
1883 /* Let's help debug shared library creation. These relocs
1884 cannot be used in shared libs. Don't error out for
1885 sections we don't care about, such as debug sections or
1886 non-constant sections. */
1888 && (sec
->flags
& SEC_ALLOC
) != 0
1889 && (sec
->flags
& SEC_READONLY
) != 0)
1892 name
= h
->root
.root
.string
;
1894 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1895 (*_bfd_error_handler
)
1896 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1897 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1898 bfd_set_error (bfd_error_bad_value
);
1906 case R_X86_64_PC32_BND
:
1910 if (h
!= NULL
&& info
->executable
)
1912 /* If this reloc is in a read-only section, we might
1913 need a copy reloc. We can't check reliably at this
1914 stage whether the section is read-only, as input
1915 sections have not yet been mapped to output sections.
1916 Tentatively set the flag for now, and correct in
1917 adjust_dynamic_symbol. */
1920 /* We may need a .plt entry if the function this reloc
1921 refers to is in a shared lib. */
1922 h
->plt
.refcount
+= 1;
1923 if (r_type
!= R_X86_64_PC32
1924 && r_type
!= R_X86_64_PC32_BND
1925 && r_type
!= R_X86_64_PC64
)
1926 h
->pointer_equality_needed
= 1;
1931 /* If we are creating a shared library, and this is a reloc
1932 against a global symbol, or a non PC relative reloc
1933 against a local symbol, then we need to copy the reloc
1934 into the shared library. However, if we are linking with
1935 -Bsymbolic, we do not need to copy a reloc against a
1936 global symbol which is defined in an object we are
1937 including in the link (i.e., DEF_REGULAR is set). At
1938 this point we have not seen all the input files, so it is
1939 possible that DEF_REGULAR is not set now but will be set
1940 later (it is never cleared). In case of a weak definition,
1941 DEF_REGULAR may be cleared later by a strong definition in
1942 a shared library. We account for that possibility below by
1943 storing information in the relocs_copied field of the hash
1944 table entry. A similar situation occurs when creating
1945 shared libraries and symbol visibility changes render the
1948 If on the other hand, we are creating an executable, we
1949 may need to keep relocations for symbols satisfied by a
1950 dynamic library if we manage to avoid copy relocs for the
1953 && (sec
->flags
& SEC_ALLOC
) != 0
1954 && (! IS_X86_64_PCREL_TYPE (r_type
)
1956 && (! SYMBOLIC_BIND (info
, h
)
1957 || h
->root
.type
== bfd_link_hash_defweak
1958 || !h
->def_regular
))))
1959 || (ELIMINATE_COPY_RELOCS
1961 && (sec
->flags
& SEC_ALLOC
) != 0
1963 && (h
->root
.type
== bfd_link_hash_defweak
1964 || !h
->def_regular
)))
1966 struct elf_dyn_relocs
*p
;
1967 struct elf_dyn_relocs
**head
;
1969 /* We must copy these reloc types into the output file.
1970 Create a reloc section in dynobj and make room for
1974 if (htab
->elf
.dynobj
== NULL
)
1975 htab
->elf
.dynobj
= abfd
;
1977 sreloc
= _bfd_elf_make_dynamic_reloc_section
1978 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
1979 abfd
, /*rela?*/ TRUE
);
1985 /* If this is a global symbol, we count the number of
1986 relocations we need for this symbol. */
1989 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1993 /* Track dynamic relocs needed for local syms too.
1994 We really need local syms available to do this
1999 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2004 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2008 /* Beware of type punned pointers vs strict aliasing
2010 vpp
= &(elf_section_data (s
)->local_dynrel
);
2011 head
= (struct elf_dyn_relocs
**)vpp
;
2015 if (p
== NULL
|| p
->sec
!= sec
)
2017 bfd_size_type amt
= sizeof *p
;
2019 p
= ((struct elf_dyn_relocs
*)
2020 bfd_alloc (htab
->elf
.dynobj
, amt
));
2031 /* Count size relocation as PC-relative relocation. */
2032 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2037 /* This relocation describes the C++ object vtable hierarchy.
2038 Reconstruct it for later use during GC. */
2039 case R_X86_64_GNU_VTINHERIT
:
2040 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2044 /* This relocation describes which C++ vtable entries are actually
2045 used. Record for later use during GC. */
2046 case R_X86_64_GNU_VTENTRY
:
2047 BFD_ASSERT (h
!= NULL
);
2049 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2061 /* Return the section that should be marked against GC for a given
2065 elf_x86_64_gc_mark_hook (asection
*sec
,
2066 struct bfd_link_info
*info
,
2067 Elf_Internal_Rela
*rel
,
2068 struct elf_link_hash_entry
*h
,
2069 Elf_Internal_Sym
*sym
)
2072 switch (ELF32_R_TYPE (rel
->r_info
))
2074 case R_X86_64_GNU_VTINHERIT
:
2075 case R_X86_64_GNU_VTENTRY
:
2079 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2082 /* Update the got entry reference counts for the section being removed. */
2085 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
2087 const Elf_Internal_Rela
*relocs
)
2089 struct elf_x86_64_link_hash_table
*htab
;
2090 Elf_Internal_Shdr
*symtab_hdr
;
2091 struct elf_link_hash_entry
**sym_hashes
;
2092 bfd_signed_vma
*local_got_refcounts
;
2093 const Elf_Internal_Rela
*rel
, *relend
;
2095 if (info
->relocatable
)
2098 htab
= elf_x86_64_hash_table (info
);
2102 elf_section_data (sec
)->local_dynrel
= NULL
;
2104 symtab_hdr
= &elf_symtab_hdr (abfd
);
2105 sym_hashes
= elf_sym_hashes (abfd
);
2106 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2108 htab
= elf_x86_64_hash_table (info
);
2109 relend
= relocs
+ sec
->reloc_count
;
2110 for (rel
= relocs
; rel
< relend
; rel
++)
2112 unsigned long r_symndx
;
2113 unsigned int r_type
;
2114 struct elf_link_hash_entry
*h
= NULL
;
2116 r_symndx
= htab
->r_sym (rel
->r_info
);
2117 if (r_symndx
>= symtab_hdr
->sh_info
)
2119 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2120 while (h
->root
.type
== bfd_link_hash_indirect
2121 || h
->root
.type
== bfd_link_hash_warning
)
2122 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2126 /* A local symbol. */
2127 Elf_Internal_Sym
*isym
;
2129 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2132 /* Check relocation against local STT_GNU_IFUNC symbol. */
2134 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2136 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2144 struct elf_x86_64_link_hash_entry
*eh
;
2145 struct elf_dyn_relocs
**pp
;
2146 struct elf_dyn_relocs
*p
;
2148 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2150 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2153 /* Everything must go for SEC. */
2159 r_type
= ELF32_R_TYPE (rel
->r_info
);
2160 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2161 symtab_hdr
, sym_hashes
,
2162 &r_type
, GOT_UNKNOWN
,
2163 rel
, relend
, h
, r_symndx
))
2168 case R_X86_64_TLSLD
:
2169 if (htab
->tls_ld_got
.refcount
> 0)
2170 htab
->tls_ld_got
.refcount
-= 1;
2173 case R_X86_64_TLSGD
:
2174 case R_X86_64_GOTPC32_TLSDESC
:
2175 case R_X86_64_TLSDESC_CALL
:
2176 case R_X86_64_GOTTPOFF
:
2177 case R_X86_64_GOT32
:
2178 case R_X86_64_GOTPCREL
:
2179 case R_X86_64_GOT64
:
2180 case R_X86_64_GOTPCREL64
:
2181 case R_X86_64_GOTPLT64
:
2184 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
2185 h
->plt
.refcount
-= 1;
2186 if (h
->got
.refcount
> 0)
2187 h
->got
.refcount
-= 1;
2188 if (h
->type
== STT_GNU_IFUNC
)
2190 if (h
->plt
.refcount
> 0)
2191 h
->plt
.refcount
-= 1;
2194 else if (local_got_refcounts
!= NULL
)
2196 if (local_got_refcounts
[r_symndx
] > 0)
2197 local_got_refcounts
[r_symndx
] -= 1;
2209 case R_X86_64_PC32_BND
:
2211 case R_X86_64_SIZE32
:
2212 case R_X86_64_SIZE64
:
2214 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2218 case R_X86_64_PLT32
:
2219 case R_X86_64_PLT32_BND
:
2220 case R_X86_64_PLTOFF64
:
2223 if (h
->plt
.refcount
> 0)
2224 h
->plt
.refcount
-= 1;
2236 /* Adjust a symbol defined by a dynamic object and referenced by a
2237 regular object. The current definition is in some section of the
2238 dynamic object, but we're not including those sections. We have to
2239 change the definition to something the rest of the link can
2243 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2244 struct elf_link_hash_entry
*h
)
2246 struct elf_x86_64_link_hash_table
*htab
;
2248 struct elf_x86_64_link_hash_entry
*eh
;
2249 struct elf_dyn_relocs
*p
;
2251 /* STT_GNU_IFUNC symbol must go through PLT. */
2252 if (h
->type
== STT_GNU_IFUNC
)
2254 /* All local STT_GNU_IFUNC references must be treate as local
2255 calls via local PLT. */
2257 && SYMBOL_CALLS_LOCAL (info
, h
))
2259 bfd_size_type pc_count
= 0, count
= 0;
2260 struct elf_dyn_relocs
**pp
;
2262 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2263 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2265 pc_count
+= p
->pc_count
;
2266 p
->count
-= p
->pc_count
;
2275 if (pc_count
|| count
)
2279 if (h
->plt
.refcount
<= 0)
2280 h
->plt
.refcount
= 1;
2282 h
->plt
.refcount
+= 1;
2286 if (h
->plt
.refcount
<= 0)
2288 h
->plt
.offset
= (bfd_vma
) -1;
2294 /* If this is a function, put it in the procedure linkage table. We
2295 will fill in the contents of the procedure linkage table later,
2296 when we know the address of the .got section. */
2297 if (h
->type
== STT_FUNC
2300 if (h
->plt
.refcount
<= 0
2301 || SYMBOL_CALLS_LOCAL (info
, h
)
2302 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2303 && h
->root
.type
== bfd_link_hash_undefweak
))
2305 /* This case can occur if we saw a PLT32 reloc in an input
2306 file, but the symbol was never referred to by a dynamic
2307 object, or if all references were garbage collected. In
2308 such a case, we don't actually need to build a procedure
2309 linkage table, and we can just do a PC32 reloc instead. */
2310 h
->plt
.offset
= (bfd_vma
) -1;
2317 /* It's possible that we incorrectly decided a .plt reloc was
2318 needed for an R_X86_64_PC32 reloc to a non-function sym in
2319 check_relocs. We can't decide accurately between function and
2320 non-function syms in check-relocs; Objects loaded later in
2321 the link may change h->type. So fix it now. */
2322 h
->plt
.offset
= (bfd_vma
) -1;
2324 /* If this is a weak symbol, and there is a real definition, the
2325 processor independent code will have arranged for us to see the
2326 real definition first, and we can just use the same value. */
2327 if (h
->u
.weakdef
!= NULL
)
2329 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2330 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2331 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2332 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2333 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2334 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2338 /* This is a reference to a symbol defined by a dynamic object which
2339 is not a function. */
2341 /* If we are creating a shared library, we must presume that the
2342 only references to the symbol are via the global offset table.
2343 For such cases we need not do anything here; the relocations will
2344 be handled correctly by relocate_section. */
2348 /* If there are no references to this symbol that do not use the
2349 GOT, we don't need to generate a copy reloc. */
2350 if (!h
->non_got_ref
)
2353 /* If -z nocopyreloc was given, we won't generate them either. */
2354 if (info
->nocopyreloc
)
2360 if (ELIMINATE_COPY_RELOCS
)
2362 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2363 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2365 s
= p
->sec
->output_section
;
2366 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2370 /* If we didn't find any dynamic relocs in read-only sections, then
2371 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2379 /* We must allocate the symbol in our .dynbss section, which will
2380 become part of the .bss section of the executable. There will be
2381 an entry for this symbol in the .dynsym section. The dynamic
2382 object will contain position independent code, so all references
2383 from the dynamic object to this symbol will go through the global
2384 offset table. The dynamic linker will use the .dynsym entry to
2385 determine the address it must put in the global offset table, so
2386 both the dynamic object and the regular object will refer to the
2387 same memory location for the variable. */
2389 htab
= elf_x86_64_hash_table (info
);
2393 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2394 to copy the initial value out of the dynamic object and into the
2395 runtime process image. */
2396 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2398 const struct elf_backend_data
*bed
;
2399 bed
= get_elf_backend_data (info
->output_bfd
);
2400 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2406 return _bfd_elf_adjust_dynamic_copy (h
, s
);
2409 /* Allocate space in .plt, .got and associated reloc sections for
2413 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2415 struct bfd_link_info
*info
;
2416 struct elf_x86_64_link_hash_table
*htab
;
2417 struct elf_x86_64_link_hash_entry
*eh
;
2418 struct elf_dyn_relocs
*p
;
2419 const struct elf_backend_data
*bed
;
2420 unsigned int plt_entry_size
;
2422 if (h
->root
.type
== bfd_link_hash_indirect
)
2425 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2427 info
= (struct bfd_link_info
*) inf
;
2428 htab
= elf_x86_64_hash_table (info
);
2431 bed
= get_elf_backend_data (info
->output_bfd
);
2432 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2434 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2435 here if it is defined and referenced in a non-shared object. */
2436 if (h
->type
== STT_GNU_IFUNC
2439 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2445 asection
*s
= htab
->plt_bnd
;
2446 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
2448 /* Use the .plt.bnd section if it is created. */
2449 eh
->plt_bnd
.offset
= s
->size
;
2451 /* Make room for this entry in the .plt.bnd section. */
2452 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2460 else if (htab
->elf
.dynamic_sections_created
2461 && h
->plt
.refcount
> 0)
2463 /* Make sure this symbol is output as a dynamic symbol.
2464 Undefined weak syms won't yet be marked as dynamic. */
2465 if (h
->dynindx
== -1
2466 && !h
->forced_local
)
2468 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2473 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2475 asection
*s
= htab
->elf
.splt
;
2476 asection
*bnd_s
= htab
->plt_bnd
;
2478 /* If this is the first .plt entry, make room for the special
2481 s
->size
= plt_entry_size
;
2483 h
->plt
.offset
= s
->size
;
2485 eh
->plt_bnd
.offset
= bnd_s
->size
;
2487 /* If this symbol is not defined in a regular file, and we are
2488 not generating a shared library, then set the symbol to this
2489 location in the .plt. This is required to make function
2490 pointers compare as equal between the normal executable and
2491 the shared library. */
2497 /* We need to make a call to the entry of the second
2498 PLT instead of regular PLT entry. */
2499 h
->root
.u
.def
.section
= bnd_s
;
2500 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
2504 h
->root
.u
.def
.section
= s
;
2505 h
->root
.u
.def
.value
= h
->plt
.offset
;
2509 /* Make room for this entry. */
2510 s
->size
+= plt_entry_size
;
2513 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
)
2514 == sizeof (elf_x86_64_legacy_plt2_entry
));
2515 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2518 /* We also need to make an entry in the .got.plt section, which
2519 will be placed in the .got section by the linker script. */
2520 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2522 /* We also need to make an entry in the .rela.plt section. */
2523 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2524 htab
->elf
.srelplt
->reloc_count
++;
2528 h
->plt
.offset
= (bfd_vma
) -1;
2534 h
->plt
.offset
= (bfd_vma
) -1;
2538 eh
->tlsdesc_got
= (bfd_vma
) -1;
2540 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2541 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2542 if (h
->got
.refcount
> 0
2545 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2547 h
->got
.offset
= (bfd_vma
) -1;
2549 else if (h
->got
.refcount
> 0)
2553 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2555 /* Make sure this symbol is output as a dynamic symbol.
2556 Undefined weak syms won't yet be marked as dynamic. */
2557 if (h
->dynindx
== -1
2558 && !h
->forced_local
)
2560 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2564 if (GOT_TLS_GDESC_P (tls_type
))
2566 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2567 - elf_x86_64_compute_jump_table_size (htab
);
2568 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2569 h
->got
.offset
= (bfd_vma
) -2;
2571 if (! GOT_TLS_GDESC_P (tls_type
)
2572 || GOT_TLS_GD_P (tls_type
))
2575 h
->got
.offset
= s
->size
;
2576 s
->size
+= GOT_ENTRY_SIZE
;
2577 if (GOT_TLS_GD_P (tls_type
))
2578 s
->size
+= GOT_ENTRY_SIZE
;
2580 dyn
= htab
->elf
.dynamic_sections_created
;
2581 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2583 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2584 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2585 || tls_type
== GOT_TLS_IE
)
2586 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2587 else if (GOT_TLS_GD_P (tls_type
))
2588 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2589 else if (! GOT_TLS_GDESC_P (tls_type
)
2590 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2591 || h
->root
.type
!= bfd_link_hash_undefweak
)
2593 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2594 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2595 if (GOT_TLS_GDESC_P (tls_type
))
2597 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2598 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2602 h
->got
.offset
= (bfd_vma
) -1;
2604 if (eh
->dyn_relocs
== NULL
)
2607 /* In the shared -Bsymbolic case, discard space allocated for
2608 dynamic pc-relative relocs against symbols which turn out to be
2609 defined in regular objects. For the normal shared case, discard
2610 space for pc-relative relocs that have become local due to symbol
2611 visibility changes. */
2615 /* Relocs that use pc_count are those that appear on a call
2616 insn, or certain REL relocs that can generated via assembly.
2617 We want calls to protected symbols to resolve directly to the
2618 function rather than going via the plt. If people want
2619 function pointer comparisons to work as expected then they
2620 should avoid writing weird assembly. */
2621 if (SYMBOL_CALLS_LOCAL (info
, h
))
2623 struct elf_dyn_relocs
**pp
;
2625 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2627 p
->count
-= p
->pc_count
;
2636 /* Also discard relocs on undefined weak syms with non-default
2638 if (eh
->dyn_relocs
!= NULL
2639 && h
->root
.type
== bfd_link_hash_undefweak
)
2641 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2642 eh
->dyn_relocs
= NULL
;
2644 /* Make sure undefined weak symbols are output as a dynamic
2646 else if (h
->dynindx
== -1
2647 && ! h
->forced_local
2648 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2653 else if (ELIMINATE_COPY_RELOCS
)
2655 /* For the non-shared case, discard space for relocs against
2656 symbols which turn out to need copy relocs or are not
2662 || (htab
->elf
.dynamic_sections_created
2663 && (h
->root
.type
== bfd_link_hash_undefweak
2664 || h
->root
.type
== bfd_link_hash_undefined
))))
2666 /* Make sure this symbol is output as a dynamic symbol.
2667 Undefined weak syms won't yet be marked as dynamic. */
2668 if (h
->dynindx
== -1
2669 && ! h
->forced_local
2670 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2673 /* If that succeeded, we know we'll be keeping all the
2675 if (h
->dynindx
!= -1)
2679 eh
->dyn_relocs
= NULL
;
2684 /* Finally, allocate space. */
2685 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2689 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2691 BFD_ASSERT (sreloc
!= NULL
);
2693 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2699 /* Allocate space in .plt, .got and associated reloc sections for
2700 local dynamic relocs. */
2703 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2705 struct elf_link_hash_entry
*h
2706 = (struct elf_link_hash_entry
*) *slot
;
2708 if (h
->type
!= STT_GNU_IFUNC
2712 || h
->root
.type
!= bfd_link_hash_defined
)
2715 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2718 /* Find any dynamic relocs that apply to read-only sections. */
2721 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2724 struct elf_x86_64_link_hash_entry
*eh
;
2725 struct elf_dyn_relocs
*p
;
2727 /* Skip local IFUNC symbols. */
2728 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2731 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2732 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2734 asection
*s
= p
->sec
->output_section
;
2736 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2738 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2740 info
->flags
|= DF_TEXTREL
;
2742 if (info
->warn_shared_textrel
&& info
->shared
)
2743 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2744 p
->sec
->owner
, h
->root
.root
.string
,
2747 /* Not an error, just cut short the traversal. */
2755 mov foo@GOTPCREL(%rip), %reg
2758 with the local symbol, foo. */
2761 elf_x86_64_convert_mov_to_lea (bfd
*abfd
, asection
*sec
,
2762 struct bfd_link_info
*link_info
)
2764 Elf_Internal_Shdr
*symtab_hdr
;
2765 Elf_Internal_Rela
*internal_relocs
;
2766 Elf_Internal_Rela
*irel
, *irelend
;
2768 struct elf_x86_64_link_hash_table
*htab
;
2769 bfd_boolean changed_contents
;
2770 bfd_boolean changed_relocs
;
2771 bfd_signed_vma
*local_got_refcounts
;
2773 /* Don't even try to convert non-ELF outputs. */
2774 if (!is_elf_hash_table (link_info
->hash
))
2777 /* Nothing to do if there are no codes, no relocations or no output. */
2778 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
2779 || sec
->reloc_count
== 0
2780 || bfd_is_abs_section (sec
->output_section
))
2783 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2785 /* Load the relocations for this section. */
2786 internal_relocs
= (_bfd_elf_link_read_relocs
2787 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
2788 link_info
->keep_memory
));
2789 if (internal_relocs
== NULL
)
2792 htab
= elf_x86_64_hash_table (link_info
);
2793 changed_contents
= FALSE
;
2794 changed_relocs
= FALSE
;
2795 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2797 /* Get the section contents. */
2798 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
2799 contents
= elf_section_data (sec
)->this_hdr
.contents
;
2802 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
2806 irelend
= internal_relocs
+ sec
->reloc_count
;
2807 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
2809 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
2810 unsigned int r_symndx
= htab
->r_sym (irel
->r_info
);
2812 struct elf_link_hash_entry
*h
;
2814 if (r_type
!= R_X86_64_GOTPCREL
)
2817 /* Get the symbol referred to by the reloc. */
2818 if (r_symndx
< symtab_hdr
->sh_info
)
2820 Elf_Internal_Sym
*isym
;
2822 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2825 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
2826 if (ELF_ST_TYPE (isym
->st_info
) != STT_GNU_IFUNC
2827 && irel
->r_offset
>= 2
2828 && bfd_get_8 (input_bfd
,
2829 contents
+ irel
->r_offset
- 2) == 0x8b)
2831 bfd_put_8 (output_bfd
, 0x8d,
2832 contents
+ irel
->r_offset
- 2);
2833 irel
->r_info
= htab
->r_info (r_symndx
, R_X86_64_PC32
);
2834 if (local_got_refcounts
!= NULL
2835 && local_got_refcounts
[r_symndx
] > 0)
2836 local_got_refcounts
[r_symndx
] -= 1;
2837 changed_contents
= TRUE
;
2838 changed_relocs
= TRUE
;
2843 indx
= r_symndx
- symtab_hdr
->sh_info
;
2844 h
= elf_sym_hashes (abfd
)[indx
];
2845 BFD_ASSERT (h
!= NULL
);
2847 while (h
->root
.type
== bfd_link_hash_indirect
2848 || h
->root
.type
== bfd_link_hash_warning
)
2849 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2851 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
2852 avoid optimizing _DYNAMIC since ld.so may use its link-time
2855 && h
->type
!= STT_GNU_IFUNC
2856 && h
!= htab
->elf
.hdynamic
2857 && SYMBOL_REFERENCES_LOCAL (link_info
, h
)
2858 && irel
->r_offset
>= 2
2859 && bfd_get_8 (input_bfd
,
2860 contents
+ irel
->r_offset
- 2) == 0x8b)
2862 bfd_put_8 (output_bfd
, 0x8d,
2863 contents
+ irel
->r_offset
- 2);
2864 irel
->r_info
= htab
->r_info (r_symndx
, R_X86_64_PC32
);
2865 if (h
->got
.refcount
> 0)
2866 h
->got
.refcount
-= 1;
2867 changed_contents
= TRUE
;
2868 changed_relocs
= TRUE
;
2872 if (contents
!= NULL
2873 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2875 if (!changed_contents
&& !link_info
->keep_memory
)
2879 /* Cache the section contents for elf_link_input_bfd. */
2880 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2884 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
2886 if (!changed_relocs
)
2887 free (internal_relocs
);
2889 elf_section_data (sec
)->relocs
= internal_relocs
;
2895 if (contents
!= NULL
2896 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2898 if (internal_relocs
!= NULL
2899 && elf_section_data (sec
)->relocs
!= internal_relocs
)
2900 free (internal_relocs
);
2904 /* Set the sizes of the dynamic sections. */
2907 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
2908 struct bfd_link_info
*info
)
2910 struct elf_x86_64_link_hash_table
*htab
;
2915 const struct elf_backend_data
*bed
;
2917 htab
= elf_x86_64_hash_table (info
);
2920 bed
= get_elf_backend_data (output_bfd
);
2922 dynobj
= htab
->elf
.dynobj
;
2926 if (htab
->elf
.dynamic_sections_created
)
2928 /* Set the contents of the .interp section to the interpreter. */
2929 if (info
->executable
)
2931 s
= bfd_get_linker_section (dynobj
, ".interp");
2934 s
->size
= htab
->dynamic_interpreter_size
;
2935 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2939 /* Set up .got offsets for local syms, and space for local dynamic
2941 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
2943 bfd_signed_vma
*local_got
;
2944 bfd_signed_vma
*end_local_got
;
2945 char *local_tls_type
;
2946 bfd_vma
*local_tlsdesc_gotent
;
2947 bfd_size_type locsymcount
;
2948 Elf_Internal_Shdr
*symtab_hdr
;
2951 if (! is_x86_64_elf (ibfd
))
2954 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2956 struct elf_dyn_relocs
*p
;
2958 if (!elf_x86_64_convert_mov_to_lea (ibfd
, s
, info
))
2961 for (p
= (struct elf_dyn_relocs
*)
2962 (elf_section_data (s
)->local_dynrel
);
2966 if (!bfd_is_abs_section (p
->sec
)
2967 && bfd_is_abs_section (p
->sec
->output_section
))
2969 /* Input section has been discarded, either because
2970 it is a copy of a linkonce section or due to
2971 linker script /DISCARD/, so we'll be discarding
2974 else if (p
->count
!= 0)
2976 srel
= elf_section_data (p
->sec
)->sreloc
;
2977 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2978 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
2979 && (info
->flags
& DF_TEXTREL
) == 0)
2981 info
->flags
|= DF_TEXTREL
;
2982 if (info
->warn_shared_textrel
&& info
->shared
)
2983 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2984 p
->sec
->owner
, p
->sec
);
2990 local_got
= elf_local_got_refcounts (ibfd
);
2994 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2995 locsymcount
= symtab_hdr
->sh_info
;
2996 end_local_got
= local_got
+ locsymcount
;
2997 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
2998 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3000 srel
= htab
->elf
.srelgot
;
3001 for (; local_got
< end_local_got
;
3002 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3004 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3007 if (GOT_TLS_GDESC_P (*local_tls_type
))
3009 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3010 - elf_x86_64_compute_jump_table_size (htab
);
3011 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3012 *local_got
= (bfd_vma
) -2;
3014 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3015 || GOT_TLS_GD_P (*local_tls_type
))
3017 *local_got
= s
->size
;
3018 s
->size
+= GOT_ENTRY_SIZE
;
3019 if (GOT_TLS_GD_P (*local_tls_type
))
3020 s
->size
+= GOT_ENTRY_SIZE
;
3023 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3024 || *local_tls_type
== GOT_TLS_IE
)
3026 if (GOT_TLS_GDESC_P (*local_tls_type
))
3028 htab
->elf
.srelplt
->size
3029 += bed
->s
->sizeof_rela
;
3030 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3032 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3033 || GOT_TLS_GD_P (*local_tls_type
))
3034 srel
->size
+= bed
->s
->sizeof_rela
;
3038 *local_got
= (bfd_vma
) -1;
3042 if (htab
->tls_ld_got
.refcount
> 0)
3044 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3046 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3047 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3048 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3051 htab
->tls_ld_got
.offset
= -1;
3053 /* Allocate global sym .plt and .got entries, and space for global
3054 sym dynamic relocs. */
3055 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3058 /* Allocate .plt and .got entries, and space for local symbols. */
3059 htab_traverse (htab
->loc_hash_table
,
3060 elf_x86_64_allocate_local_dynrelocs
,
3063 /* For every jump slot reserved in the sgotplt, reloc_count is
3064 incremented. However, when we reserve space for TLS descriptors,
3065 it's not incremented, so in order to compute the space reserved
3066 for them, it suffices to multiply the reloc count by the jump
3069 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3070 so that R_X86_64_IRELATIVE entries come last. */
3071 if (htab
->elf
.srelplt
)
3073 htab
->sgotplt_jump_table_size
3074 = elf_x86_64_compute_jump_table_size (htab
);
3075 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3077 else if (htab
->elf
.irelplt
)
3078 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3080 if (htab
->tlsdesc_plt
)
3082 /* If we're not using lazy TLS relocations, don't generate the
3083 PLT and GOT entries they require. */
3084 if ((info
->flags
& DF_BIND_NOW
))
3085 htab
->tlsdesc_plt
= 0;
3088 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3089 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3090 /* Reserve room for the initial entry.
3091 FIXME: we could probably do away with it in this case. */
3092 if (htab
->elf
.splt
->size
== 0)
3093 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3094 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3095 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3099 if (htab
->elf
.sgotplt
)
3101 /* Don't allocate .got.plt section if there are no GOT nor PLT
3102 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3103 if ((htab
->elf
.hgot
== NULL
3104 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3105 && (htab
->elf
.sgotplt
->size
3106 == get_elf_backend_data (output_bfd
)->got_header_size
)
3107 && (htab
->elf
.splt
== NULL
3108 || htab
->elf
.splt
->size
== 0)
3109 && (htab
->elf
.sgot
== NULL
3110 || htab
->elf
.sgot
->size
== 0)
3111 && (htab
->elf
.iplt
== NULL
3112 || htab
->elf
.iplt
->size
== 0)
3113 && (htab
->elf
.igotplt
== NULL
3114 || htab
->elf
.igotplt
->size
== 0))
3115 htab
->elf
.sgotplt
->size
= 0;
3118 if (htab
->plt_eh_frame
!= NULL
3119 && htab
->elf
.splt
!= NULL
3120 && htab
->elf
.splt
->size
!= 0
3121 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3122 && _bfd_elf_eh_frame_present (info
))
3124 const struct elf_x86_64_backend_data
*arch_data
3125 = get_elf_x86_64_arch_data (bed
);
3126 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3129 /* We now have determined the sizes of the various dynamic sections.
3130 Allocate memory for them. */
3132 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3134 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3137 if (s
== htab
->elf
.splt
3138 || s
== htab
->elf
.sgot
3139 || s
== htab
->elf
.sgotplt
3140 || s
== htab
->elf
.iplt
3141 || s
== htab
->elf
.igotplt
3142 || s
== htab
->plt_bnd
3143 || s
== htab
->plt_eh_frame
3144 || s
== htab
->sdynbss
)
3146 /* Strip this section if we don't need it; see the
3149 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3151 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3154 /* We use the reloc_count field as a counter if we need
3155 to copy relocs into the output file. */
3156 if (s
!= htab
->elf
.srelplt
)
3161 /* It's not one of our sections, so don't allocate space. */
3167 /* If we don't need this section, strip it from the
3168 output file. This is mostly to handle .rela.bss and
3169 .rela.plt. We must create both sections in
3170 create_dynamic_sections, because they must be created
3171 before the linker maps input sections to output
3172 sections. The linker does that before
3173 adjust_dynamic_symbol is called, and it is that
3174 function which decides whether anything needs to go
3175 into these sections. */
3177 s
->flags
|= SEC_EXCLUDE
;
3181 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3184 /* Allocate memory for the section contents. We use bfd_zalloc
3185 here in case unused entries are not reclaimed before the
3186 section's contents are written out. This should not happen,
3187 but this way if it does, we get a R_X86_64_NONE reloc instead
3189 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3190 if (s
->contents
== NULL
)
3194 if (htab
->plt_eh_frame
!= NULL
3195 && htab
->plt_eh_frame
->contents
!= NULL
)
3197 const struct elf_x86_64_backend_data
*arch_data
3198 = get_elf_x86_64_arch_data (bed
);
3200 memcpy (htab
->plt_eh_frame
->contents
,
3201 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3202 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3203 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3206 if (htab
->elf
.dynamic_sections_created
)
3208 /* Add some entries to the .dynamic section. We fill in the
3209 values later, in elf_x86_64_finish_dynamic_sections, but we
3210 must add the entries now so that we get the correct size for
3211 the .dynamic section. The DT_DEBUG entry is filled in by the
3212 dynamic linker and used by the debugger. */
3213 #define add_dynamic_entry(TAG, VAL) \
3214 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3216 if (info
->executable
)
3218 if (!add_dynamic_entry (DT_DEBUG
, 0))
3222 if (htab
->elf
.splt
->size
!= 0)
3224 if (!add_dynamic_entry (DT_PLTGOT
, 0)
3225 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
3226 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3227 || !add_dynamic_entry (DT_JMPREL
, 0))
3230 if (htab
->tlsdesc_plt
3231 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3232 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3238 if (!add_dynamic_entry (DT_RELA
, 0)
3239 || !add_dynamic_entry (DT_RELASZ
, 0)
3240 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3243 /* If any dynamic relocs apply to a read-only section,
3244 then we need a DT_TEXTREL entry. */
3245 if ((info
->flags
& DF_TEXTREL
) == 0)
3246 elf_link_hash_traverse (&htab
->elf
,
3247 elf_x86_64_readonly_dynrelocs
,
3250 if ((info
->flags
& DF_TEXTREL
) != 0)
3252 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3257 #undef add_dynamic_entry
3263 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3264 struct bfd_link_info
*info
)
3266 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3270 struct elf_link_hash_entry
*tlsbase
;
3272 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3273 "_TLS_MODULE_BASE_",
3274 FALSE
, FALSE
, FALSE
);
3276 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3278 struct elf_x86_64_link_hash_table
*htab
;
3279 struct bfd_link_hash_entry
*bh
= NULL
;
3280 const struct elf_backend_data
*bed
3281 = get_elf_backend_data (output_bfd
);
3283 htab
= elf_x86_64_hash_table (info
);
3287 if (!(_bfd_generic_link_add_one_symbol
3288 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3289 tls_sec
, 0, NULL
, FALSE
,
3290 bed
->collect
, &bh
)))
3293 htab
->tls_module_base
= bh
;
3295 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3296 tlsbase
->def_regular
= 1;
3297 tlsbase
->other
= STV_HIDDEN
;
3298 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3305 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3306 executables. Rather than setting it to the beginning of the TLS
3307 section, we have to set it to the end. This function may be called
3308 multiple times, it is idempotent. */
3311 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3313 struct elf_x86_64_link_hash_table
*htab
;
3314 struct bfd_link_hash_entry
*base
;
3316 if (!info
->executable
)
3319 htab
= elf_x86_64_hash_table (info
);
3323 base
= htab
->tls_module_base
;
3327 base
->u
.def
.value
= htab
->elf
.tls_size
;
3330 /* Return the base VMA address which should be subtracted from real addresses
3331 when resolving @dtpoff relocation.
3332 This is PT_TLS segment p_vaddr. */
3335 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3337 /* If tls_sec is NULL, we should have signalled an error already. */
3338 if (elf_hash_table (info
)->tls_sec
== NULL
)
3340 return elf_hash_table (info
)->tls_sec
->vma
;
3343 /* Return the relocation value for @tpoff relocation
3344 if STT_TLS virtual address is ADDRESS. */
3347 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3349 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3350 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3351 bfd_vma static_tls_size
;
3353 /* If tls_segment is NULL, we should have signalled an error already. */
3354 if (htab
->tls_sec
== NULL
)
3357 /* Consider special static TLS alignment requirements. */
3358 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3359 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3362 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3366 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3368 /* Opcode Instruction
3371 0x0f 0x8x conditional jump */
3373 && (contents
[offset
- 1] == 0xe8
3374 || contents
[offset
- 1] == 0xe9))
3376 && contents
[offset
- 2] == 0x0f
3377 && (contents
[offset
- 1] & 0xf0) == 0x80));
3380 /* Relocate an x86_64 ELF section. */
3383 elf_x86_64_relocate_section (bfd
*output_bfd
,
3384 struct bfd_link_info
*info
,
3386 asection
*input_section
,
3388 Elf_Internal_Rela
*relocs
,
3389 Elf_Internal_Sym
*local_syms
,
3390 asection
**local_sections
)
3392 struct elf_x86_64_link_hash_table
*htab
;
3393 Elf_Internal_Shdr
*symtab_hdr
;
3394 struct elf_link_hash_entry
**sym_hashes
;
3395 bfd_vma
*local_got_offsets
;
3396 bfd_vma
*local_tlsdesc_gotents
;
3397 Elf_Internal_Rela
*rel
;
3398 Elf_Internal_Rela
*relend
;
3399 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3401 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3403 htab
= elf_x86_64_hash_table (info
);
3406 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3407 sym_hashes
= elf_sym_hashes (input_bfd
);
3408 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3409 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3411 elf_x86_64_set_tls_module_base (info
);
3414 relend
= relocs
+ input_section
->reloc_count
;
3415 for (; rel
< relend
; rel
++)
3417 unsigned int r_type
;
3418 reloc_howto_type
*howto
;
3419 unsigned long r_symndx
;
3420 struct elf_link_hash_entry
*h
;
3421 struct elf_x86_64_link_hash_entry
*eh
;
3422 Elf_Internal_Sym
*sym
;
3424 bfd_vma off
, offplt
, plt_offset
;
3426 bfd_boolean unresolved_reloc
;
3427 bfd_reloc_status_type r
;
3429 asection
*base_got
, *resolved_plt
;
3432 r_type
= ELF32_R_TYPE (rel
->r_info
);
3433 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3434 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3437 if (r_type
>= (int) R_X86_64_standard
)
3439 (*_bfd_error_handler
)
3440 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3441 input_bfd
, input_section
, r_type
);
3442 bfd_set_error (bfd_error_bad_value
);
3446 if (r_type
!= (int) R_X86_64_32
3447 || ABI_64_P (output_bfd
))
3448 howto
= x86_64_elf_howto_table
+ r_type
;
3450 howto
= (x86_64_elf_howto_table
3451 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3452 r_symndx
= htab
->r_sym (rel
->r_info
);
3456 unresolved_reloc
= FALSE
;
3457 if (r_symndx
< symtab_hdr
->sh_info
)
3459 sym
= local_syms
+ r_symndx
;
3460 sec
= local_sections
[r_symndx
];
3462 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3464 st_size
= sym
->st_size
;
3466 /* Relocate against local STT_GNU_IFUNC symbol. */
3467 if (!info
->relocatable
3468 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3470 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3475 /* Set STT_GNU_IFUNC symbol value. */
3476 h
->root
.u
.def
.value
= sym
->st_value
;
3477 h
->root
.u
.def
.section
= sec
;
3482 bfd_boolean warned ATTRIBUTE_UNUSED
;
3483 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3485 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3486 r_symndx
, symtab_hdr
, sym_hashes
,
3488 unresolved_reloc
, warned
, ignored
);
3492 if (sec
!= NULL
&& discarded_section (sec
))
3493 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3494 rel
, 1, relend
, howto
, 0, contents
);
3496 if (info
->relocatable
)
3499 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
3501 if (r_type
== R_X86_64_64
)
3503 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3504 zero-extend it to 64bit if addend is zero. */
3505 r_type
= R_X86_64_32
;
3506 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3508 else if (r_type
== R_X86_64_SIZE64
)
3510 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3511 zero-extend it to 64bit if addend is zero. */
3512 r_type
= R_X86_64_SIZE32
;
3513 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3517 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3519 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3520 it here if it is defined in a non-shared object. */
3522 && h
->type
== STT_GNU_IFUNC
3528 if ((input_section
->flags
& SEC_ALLOC
) == 0
3529 || h
->plt
.offset
== (bfd_vma
) -1)
3532 /* STT_GNU_IFUNC symbol must go through PLT. */
3533 if (htab
->elf
.splt
!= NULL
)
3535 if (htab
->plt_bnd
!= NULL
)
3537 resolved_plt
= htab
->plt_bnd
;
3538 plt_offset
= eh
->plt_bnd
.offset
;
3542 resolved_plt
= htab
->elf
.splt
;
3543 plt_offset
= h
->plt
.offset
;
3548 resolved_plt
= htab
->elf
.iplt
;
3549 plt_offset
= h
->plt
.offset
;
3552 relocation
= (resolved_plt
->output_section
->vma
3553 + resolved_plt
->output_offset
+ plt_offset
);
3558 if (h
->root
.root
.string
)
3559 name
= h
->root
.root
.string
;
3561 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3563 (*_bfd_error_handler
)
3564 (_("%B: relocation %s against STT_GNU_IFUNC "
3565 "symbol `%s' isn't handled by %s"), input_bfd
,
3566 x86_64_elf_howto_table
[r_type
].name
,
3567 name
, __FUNCTION__
);
3568 bfd_set_error (bfd_error_bad_value
);
3577 if (ABI_64_P (output_bfd
))
3581 if (rel
->r_addend
!= 0)
3583 if (h
->root
.root
.string
)
3584 name
= h
->root
.root
.string
;
3586 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3588 (*_bfd_error_handler
)
3589 (_("%B: relocation %s against STT_GNU_IFUNC "
3590 "symbol `%s' has non-zero addend: %d"),
3591 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
3592 name
, rel
->r_addend
);
3593 bfd_set_error (bfd_error_bad_value
);
3597 /* Generate dynamic relcoation only when there is a
3598 non-GOT reference in a shared object. */
3599 if (info
->shared
&& h
->non_got_ref
)
3601 Elf_Internal_Rela outrel
;
3604 /* Need a dynamic relocation to get the real function
3606 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
3610 if (outrel
.r_offset
== (bfd_vma
) -1
3611 || outrel
.r_offset
== (bfd_vma
) -2)
3614 outrel
.r_offset
+= (input_section
->output_section
->vma
3615 + input_section
->output_offset
);
3617 if (h
->dynindx
== -1
3619 || info
->executable
)
3621 /* This symbol is resolved locally. */
3622 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3623 outrel
.r_addend
= (h
->root
.u
.def
.value
3624 + h
->root
.u
.def
.section
->output_section
->vma
3625 + h
->root
.u
.def
.section
->output_offset
);
3629 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3630 outrel
.r_addend
= 0;
3633 sreloc
= htab
->elf
.irelifunc
;
3634 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3636 /* If this reloc is against an external symbol, we
3637 do not want to fiddle with the addend. Otherwise,
3638 we need to include the symbol value so that it
3639 becomes an addend for the dynamic reloc. For an
3640 internal symbol, we have updated addend. */
3645 case R_X86_64_PC32_BND
:
3647 case R_X86_64_PLT32
:
3648 case R_X86_64_PLT32_BND
:
3651 case R_X86_64_GOTPCREL
:
3652 case R_X86_64_GOTPCREL64
:
3653 base_got
= htab
->elf
.sgot
;
3654 off
= h
->got
.offset
;
3656 if (base_got
== NULL
)
3659 if (off
== (bfd_vma
) -1)
3661 /* We can't use h->got.offset here to save state, or
3662 even just remember the offset, as finish_dynamic_symbol
3663 would use that as offset into .got. */
3665 if (htab
->elf
.splt
!= NULL
)
3667 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3668 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3669 base_got
= htab
->elf
.sgotplt
;
3673 plt_index
= h
->plt
.offset
/ plt_entry_size
;
3674 off
= plt_index
* GOT_ENTRY_SIZE
;
3675 base_got
= htab
->elf
.igotplt
;
3678 if (h
->dynindx
== -1
3682 /* This references the local defitionion. We must
3683 initialize this entry in the global offset table.
3684 Since the offset must always be a multiple of 8,
3685 we use the least significant bit to record
3686 whether we have initialized it already.
3688 When doing a dynamic link, we create a .rela.got
3689 relocation entry to initialize the value. This
3690 is done in the finish_dynamic_symbol routine. */
3695 bfd_put_64 (output_bfd
, relocation
,
3696 base_got
->contents
+ off
);
3697 /* Note that this is harmless for the GOTPLT64
3698 case, as -1 | 1 still is -1. */
3704 relocation
= (base_got
->output_section
->vma
3705 + base_got
->output_offset
+ off
);
3711 /* When generating a shared object, the relocations handled here are
3712 copied into the output file to be resolved at run time. */
3715 case R_X86_64_GOT32
:
3716 case R_X86_64_GOT64
:
3717 /* Relocation is to the entry for this symbol in the global
3719 case R_X86_64_GOTPCREL
:
3720 case R_X86_64_GOTPCREL64
:
3721 /* Use global offset table entry as symbol value. */
3722 case R_X86_64_GOTPLT64
:
3723 /* This is the same as GOT64 for relocation purposes, but
3724 indicates the existence of a PLT entry. The difficulty is,
3725 that we must calculate the GOT slot offset from the PLT
3726 offset, if this symbol got a PLT entry (it was global).
3727 Additionally if it's computed from the PLT entry, then that
3728 GOT offset is relative to .got.plt, not to .got. */
3729 base_got
= htab
->elf
.sgot
;
3731 if (htab
->elf
.sgot
== NULL
)
3738 off
= h
->got
.offset
;
3740 && h
->plt
.offset
!= (bfd_vma
)-1
3741 && off
== (bfd_vma
)-1)
3743 /* We can't use h->got.offset here to save
3744 state, or even just remember the offset, as
3745 finish_dynamic_symbol would use that as offset into
3747 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3748 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3749 base_got
= htab
->elf
.sgotplt
;
3752 dyn
= htab
->elf
.dynamic_sections_created
;
3754 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3756 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3757 || (ELF_ST_VISIBILITY (h
->other
)
3758 && h
->root
.type
== bfd_link_hash_undefweak
))
3760 /* This is actually a static link, or it is a -Bsymbolic
3761 link and the symbol is defined locally, or the symbol
3762 was forced to be local because of a version file. We
3763 must initialize this entry in the global offset table.
3764 Since the offset must always be a multiple of 8, we
3765 use the least significant bit to record whether we
3766 have initialized it already.
3768 When doing a dynamic link, we create a .rela.got
3769 relocation entry to initialize the value. This is
3770 done in the finish_dynamic_symbol routine. */
3775 bfd_put_64 (output_bfd
, relocation
,
3776 base_got
->contents
+ off
);
3777 /* Note that this is harmless for the GOTPLT64 case,
3778 as -1 | 1 still is -1. */
3783 unresolved_reloc
= FALSE
;
3787 if (local_got_offsets
== NULL
)
3790 off
= local_got_offsets
[r_symndx
];
3792 /* The offset must always be a multiple of 8. We use
3793 the least significant bit to record whether we have
3794 already generated the necessary reloc. */
3799 bfd_put_64 (output_bfd
, relocation
,
3800 base_got
->contents
+ off
);
3805 Elf_Internal_Rela outrel
;
3807 /* We need to generate a R_X86_64_RELATIVE reloc
3808 for the dynamic linker. */
3809 s
= htab
->elf
.srelgot
;
3813 outrel
.r_offset
= (base_got
->output_section
->vma
3814 + base_got
->output_offset
3816 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3817 outrel
.r_addend
= relocation
;
3818 elf_append_rela (output_bfd
, s
, &outrel
);
3821 local_got_offsets
[r_symndx
] |= 1;
3825 if (off
>= (bfd_vma
) -2)
3828 relocation
= base_got
->output_section
->vma
3829 + base_got
->output_offset
+ off
;
3830 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3831 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3832 - htab
->elf
.sgotplt
->output_offset
;
3836 case R_X86_64_GOTOFF64
:
3837 /* Relocation is relative to the start of the global offset
3840 /* Check to make sure it isn't a protected function symbol
3841 for shared library since it may not be local when used
3842 as function address. */
3843 if (!info
->executable
3845 && !SYMBOLIC_BIND (info
, h
)
3847 && h
->type
== STT_FUNC
3848 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3850 (*_bfd_error_handler
)
3851 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3852 input_bfd
, h
->root
.root
.string
);
3853 bfd_set_error (bfd_error_bad_value
);
3857 /* Note that sgot is not involved in this
3858 calculation. We always want the start of .got.plt. If we
3859 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3860 permitted by the ABI, we might have to change this
3862 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3863 + htab
->elf
.sgotplt
->output_offset
;
3866 case R_X86_64_GOTPC32
:
3867 case R_X86_64_GOTPC64
:
3868 /* Use global offset table as symbol value. */
3869 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3870 + htab
->elf
.sgotplt
->output_offset
;
3871 unresolved_reloc
= FALSE
;
3874 case R_X86_64_PLTOFF64
:
3875 /* Relocation is PLT entry relative to GOT. For local
3876 symbols it's the symbol itself relative to GOT. */
3878 /* See PLT32 handling. */
3879 && h
->plt
.offset
!= (bfd_vma
) -1
3880 && htab
->elf
.splt
!= NULL
)
3882 if (htab
->plt_bnd
!= NULL
)
3884 resolved_plt
= htab
->plt_bnd
;
3885 plt_offset
= eh
->plt_bnd
.offset
;
3889 resolved_plt
= htab
->elf
.splt
;
3890 plt_offset
= h
->plt
.offset
;
3893 relocation
= (resolved_plt
->output_section
->vma
3894 + resolved_plt
->output_offset
3896 unresolved_reloc
= FALSE
;
3899 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3900 + htab
->elf
.sgotplt
->output_offset
;
3903 case R_X86_64_PLT32
:
3904 case R_X86_64_PLT32_BND
:
3905 /* Relocation is to the entry for this symbol in the
3906 procedure linkage table. */
3908 /* Resolve a PLT32 reloc against a local symbol directly,
3909 without using the procedure linkage table. */
3913 if (h
->plt
.offset
== (bfd_vma
) -1
3914 || htab
->elf
.splt
== NULL
)
3916 /* We didn't make a PLT entry for this symbol. This
3917 happens when statically linking PIC code, or when
3918 using -Bsymbolic. */
3922 if (htab
->plt_bnd
!= NULL
)
3924 resolved_plt
= htab
->plt_bnd
;
3925 plt_offset
= eh
->plt_bnd
.offset
;
3929 resolved_plt
= htab
->elf
.splt
;
3930 plt_offset
= h
->plt
.offset
;
3933 relocation
= (resolved_plt
->output_section
->vma
3934 + resolved_plt
->output_offset
3936 unresolved_reloc
= FALSE
;
3939 case R_X86_64_SIZE32
:
3940 case R_X86_64_SIZE64
:
3941 /* Set to symbol size. */
3942 relocation
= st_size
;
3948 case R_X86_64_PC32_BND
:
3950 && (input_section
->flags
& SEC_ALLOC
) != 0
3951 && (input_section
->flags
& SEC_READONLY
) != 0
3954 bfd_boolean fail
= FALSE
;
3956 = ((r_type
== R_X86_64_PC32
3957 || r_type
== R_X86_64_PC32_BND
)
3958 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3960 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3962 /* Symbol is referenced locally. Make sure it is
3963 defined locally or for a branch. */
3964 fail
= !h
->def_regular
&& !branch
;
3968 /* Symbol isn't referenced locally. We only allow
3969 branch to symbol with non-default visibility. */
3971 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3978 const char *pic
= "";
3980 switch (ELF_ST_VISIBILITY (h
->other
))
3983 v
= _("hidden symbol");
3986 v
= _("internal symbol");
3989 v
= _("protected symbol");
3993 pic
= _("; recompile with -fPIC");
3998 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4000 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4002 (*_bfd_error_handler
) (fmt
, input_bfd
,
4003 x86_64_elf_howto_table
[r_type
].name
,
4004 v
, h
->root
.root
.string
, pic
);
4005 bfd_set_error (bfd_error_bad_value
);
4016 /* FIXME: The ABI says the linker should make sure the value is
4017 the same when it's zeroextended to 64 bit. */
4020 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4025 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4026 || h
->root
.type
!= bfd_link_hash_undefweak
)
4027 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4028 && r_type
!= R_X86_64_SIZE32
4029 && r_type
!= R_X86_64_SIZE64
)
4030 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4031 || (ELIMINATE_COPY_RELOCS
4038 || h
->root
.type
== bfd_link_hash_undefweak
4039 || h
->root
.type
== bfd_link_hash_undefined
)))
4041 Elf_Internal_Rela outrel
;
4042 bfd_boolean skip
, relocate
;
4045 /* When generating a shared object, these relocations
4046 are copied into the output file to be resolved at run
4052 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4054 if (outrel
.r_offset
== (bfd_vma
) -1)
4056 else if (outrel
.r_offset
== (bfd_vma
) -2)
4057 skip
= TRUE
, relocate
= TRUE
;
4059 outrel
.r_offset
+= (input_section
->output_section
->vma
4060 + input_section
->output_offset
);
4063 memset (&outrel
, 0, sizeof outrel
);
4065 /* h->dynindx may be -1 if this symbol was marked to
4069 && (IS_X86_64_PCREL_TYPE (r_type
)
4071 || ! SYMBOLIC_BIND (info
, h
)
4072 || ! h
->def_regular
))
4074 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4075 outrel
.r_addend
= rel
->r_addend
;
4079 /* This symbol is local, or marked to become local. */
4080 if (r_type
== htab
->pointer_r_type
)
4083 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4084 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4086 else if (r_type
== R_X86_64_64
4087 && !ABI_64_P (output_bfd
))
4090 outrel
.r_info
= htab
->r_info (0,
4091 R_X86_64_RELATIVE64
);
4092 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4093 /* Check addend overflow. */
4094 if ((outrel
.r_addend
& 0x80000000)
4095 != (rel
->r_addend
& 0x80000000))
4098 int addend
= rel
->r_addend
;
4099 if (h
&& h
->root
.root
.string
)
4100 name
= h
->root
.root
.string
;
4102 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4105 (*_bfd_error_handler
)
4106 (_("%B: addend -0x%x in relocation %s against "
4107 "symbol `%s' at 0x%lx in section `%A' is "
4109 input_bfd
, input_section
, addend
,
4110 x86_64_elf_howto_table
[r_type
].name
,
4111 name
, (unsigned long) rel
->r_offset
);
4113 (*_bfd_error_handler
)
4114 (_("%B: addend 0x%x in relocation %s against "
4115 "symbol `%s' at 0x%lx in section `%A' is "
4117 input_bfd
, input_section
, addend
,
4118 x86_64_elf_howto_table
[r_type
].name
,
4119 name
, (unsigned long) rel
->r_offset
);
4120 bfd_set_error (bfd_error_bad_value
);
4128 if (bfd_is_abs_section (sec
))
4130 else if (sec
== NULL
|| sec
->owner
== NULL
)
4132 bfd_set_error (bfd_error_bad_value
);
4139 /* We are turning this relocation into one
4140 against a section symbol. It would be
4141 proper to subtract the symbol's value,
4142 osec->vma, from the emitted reloc addend,
4143 but ld.so expects buggy relocs. */
4144 osec
= sec
->output_section
;
4145 sindx
= elf_section_data (osec
)->dynindx
;
4148 asection
*oi
= htab
->elf
.text_index_section
;
4149 sindx
= elf_section_data (oi
)->dynindx
;
4151 BFD_ASSERT (sindx
!= 0);
4154 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4155 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4159 sreloc
= elf_section_data (input_section
)->sreloc
;
4161 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4163 r
= bfd_reloc_notsupported
;
4164 goto check_relocation_error
;
4167 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4169 /* If this reloc is against an external symbol, we do
4170 not want to fiddle with the addend. Otherwise, we
4171 need to include the symbol value so that it becomes
4172 an addend for the dynamic reloc. */
4179 case R_X86_64_TLSGD
:
4180 case R_X86_64_GOTPC32_TLSDESC
:
4181 case R_X86_64_TLSDESC_CALL
:
4182 case R_X86_64_GOTTPOFF
:
4183 tls_type
= GOT_UNKNOWN
;
4184 if (h
== NULL
&& local_got_offsets
)
4185 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4187 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4189 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4190 input_section
, contents
,
4191 symtab_hdr
, sym_hashes
,
4192 &r_type
, tls_type
, rel
,
4193 relend
, h
, r_symndx
))
4196 if (r_type
== R_X86_64_TPOFF32
)
4198 bfd_vma roff
= rel
->r_offset
;
4200 BFD_ASSERT (! unresolved_reloc
);
4202 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4204 /* GD->LE transition. For 64bit, change
4205 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4206 .word 0x6666; rex64; call __tls_get_addr
4209 leaq foo@tpoff(%rax), %rax
4211 leaq foo@tlsgd(%rip), %rdi
4212 .word 0x6666; rex64; call __tls_get_addr
4215 leaq foo@tpoff(%rax), %rax
4216 For largepic, change:
4217 leaq foo@tlsgd(%rip), %rdi
4218 movabsq $__tls_get_addr@pltoff, %rax
4223 leaq foo@tpoff(%rax), %rax
4224 nopw 0x0(%rax,%rax,1) */
4226 if (ABI_64_P (output_bfd
)
4227 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4229 memcpy (contents
+ roff
- 3,
4230 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4231 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4234 else if (ABI_64_P (output_bfd
))
4235 memcpy (contents
+ roff
- 4,
4236 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4239 memcpy (contents
+ roff
- 3,
4240 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4242 bfd_put_32 (output_bfd
,
4243 elf_x86_64_tpoff (info
, relocation
),
4244 contents
+ roff
+ 8 + largepic
);
4245 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4249 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4251 /* GDesc -> LE transition.
4252 It's originally something like:
4253 leaq x@tlsdesc(%rip), %rax
4256 movl $x@tpoff, %rax. */
4258 unsigned int val
, type
;
4260 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4261 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4262 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4263 contents
+ roff
- 3);
4264 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4265 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4266 contents
+ roff
- 1);
4267 bfd_put_32 (output_bfd
,
4268 elf_x86_64_tpoff (info
, relocation
),
4272 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4274 /* GDesc -> LE transition.
4279 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4280 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4283 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4285 /* IE->LE transition:
4286 Originally it can be one of:
4287 movq foo@gottpoff(%rip), %reg
4288 addq foo@gottpoff(%rip), %reg
4291 leaq foo(%reg), %reg
4294 unsigned int val
, type
, reg
;
4296 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4297 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4298 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4304 bfd_put_8 (output_bfd
, 0x49,
4305 contents
+ roff
- 3);
4306 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4307 bfd_put_8 (output_bfd
, 0x41,
4308 contents
+ roff
- 3);
4309 bfd_put_8 (output_bfd
, 0xc7,
4310 contents
+ roff
- 2);
4311 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4312 contents
+ roff
- 1);
4316 /* addq -> addq - addressing with %rsp/%r12 is
4319 bfd_put_8 (output_bfd
, 0x49,
4320 contents
+ roff
- 3);
4321 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4322 bfd_put_8 (output_bfd
, 0x41,
4323 contents
+ roff
- 3);
4324 bfd_put_8 (output_bfd
, 0x81,
4325 contents
+ roff
- 2);
4326 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4327 contents
+ roff
- 1);
4333 bfd_put_8 (output_bfd
, 0x4d,
4334 contents
+ roff
- 3);
4335 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4336 bfd_put_8 (output_bfd
, 0x45,
4337 contents
+ roff
- 3);
4338 bfd_put_8 (output_bfd
, 0x8d,
4339 contents
+ roff
- 2);
4340 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4341 contents
+ roff
- 1);
4343 bfd_put_32 (output_bfd
,
4344 elf_x86_64_tpoff (info
, relocation
),
4352 if (htab
->elf
.sgot
== NULL
)
4357 off
= h
->got
.offset
;
4358 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4362 if (local_got_offsets
== NULL
)
4365 off
= local_got_offsets
[r_symndx
];
4366 offplt
= local_tlsdesc_gotents
[r_symndx
];
4373 Elf_Internal_Rela outrel
;
4377 if (htab
->elf
.srelgot
== NULL
)
4380 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4382 if (GOT_TLS_GDESC_P (tls_type
))
4384 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4385 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4386 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4387 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4388 + htab
->elf
.sgotplt
->output_offset
4390 + htab
->sgotplt_jump_table_size
);
4391 sreloc
= htab
->elf
.srelplt
;
4393 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4395 outrel
.r_addend
= 0;
4396 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4399 sreloc
= htab
->elf
.srelgot
;
4401 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4402 + htab
->elf
.sgot
->output_offset
+ off
);
4404 if (GOT_TLS_GD_P (tls_type
))
4405 dr_type
= R_X86_64_DTPMOD64
;
4406 else if (GOT_TLS_GDESC_P (tls_type
))
4409 dr_type
= R_X86_64_TPOFF64
;
4411 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4412 outrel
.r_addend
= 0;
4413 if ((dr_type
== R_X86_64_TPOFF64
4414 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4415 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4416 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4418 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4420 if (GOT_TLS_GD_P (tls_type
))
4424 BFD_ASSERT (! unresolved_reloc
);
4425 bfd_put_64 (output_bfd
,
4426 relocation
- elf_x86_64_dtpoff_base (info
),
4427 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4431 bfd_put_64 (output_bfd
, 0,
4432 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4433 outrel
.r_info
= htab
->r_info (indx
,
4435 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4436 elf_append_rela (output_bfd
, sreloc
,
4445 local_got_offsets
[r_symndx
] |= 1;
4448 if (off
>= (bfd_vma
) -2
4449 && ! GOT_TLS_GDESC_P (tls_type
))
4451 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4453 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4454 || r_type
== R_X86_64_TLSDESC_CALL
)
4455 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4456 + htab
->elf
.sgotplt
->output_offset
4457 + offplt
+ htab
->sgotplt_jump_table_size
;
4459 relocation
= htab
->elf
.sgot
->output_section
->vma
4460 + htab
->elf
.sgot
->output_offset
+ off
;
4461 unresolved_reloc
= FALSE
;
4465 bfd_vma roff
= rel
->r_offset
;
4467 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4469 /* GD->IE transition. For 64bit, change
4470 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4471 .word 0x6666; rex64; call __tls_get_addr@plt
4474 addq foo@gottpoff(%rip), %rax
4476 leaq foo@tlsgd(%rip), %rdi
4477 .word 0x6666; rex64; call __tls_get_addr@plt
4480 addq foo@gottpoff(%rip), %rax
4481 For largepic, change:
4482 leaq foo@tlsgd(%rip), %rdi
4483 movabsq $__tls_get_addr@pltoff, %rax
4488 addq foo@gottpoff(%rax), %rax
4489 nopw 0x0(%rax,%rax,1) */
4491 if (ABI_64_P (output_bfd
)
4492 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4494 memcpy (contents
+ roff
- 3,
4495 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4496 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4499 else if (ABI_64_P (output_bfd
))
4500 memcpy (contents
+ roff
- 4,
4501 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4504 memcpy (contents
+ roff
- 3,
4505 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4508 relocation
= (htab
->elf
.sgot
->output_section
->vma
4509 + htab
->elf
.sgot
->output_offset
+ off
4512 - input_section
->output_section
->vma
4513 - input_section
->output_offset
4515 bfd_put_32 (output_bfd
, relocation
,
4516 contents
+ roff
+ 8 + largepic
);
4517 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4521 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4523 /* GDesc -> IE transition.
4524 It's originally something like:
4525 leaq x@tlsdesc(%rip), %rax
4528 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4530 /* Now modify the instruction as appropriate. To
4531 turn a leaq into a movq in the form we use it, it
4532 suffices to change the second byte from 0x8d to
4534 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4536 bfd_put_32 (output_bfd
,
4537 htab
->elf
.sgot
->output_section
->vma
4538 + htab
->elf
.sgot
->output_offset
+ off
4540 - input_section
->output_section
->vma
4541 - input_section
->output_offset
4546 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4548 /* GDesc -> IE transition.
4555 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4556 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4564 case R_X86_64_TLSLD
:
4565 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4566 input_section
, contents
,
4567 symtab_hdr
, sym_hashes
,
4568 &r_type
, GOT_UNKNOWN
,
4569 rel
, relend
, h
, r_symndx
))
4572 if (r_type
!= R_X86_64_TLSLD
)
4574 /* LD->LE transition:
4575 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4576 For 64bit, we change it into:
4577 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4578 For 32bit, we change it into:
4579 nopl 0x0(%rax); movl %fs:0, %eax.
4580 For largepic, change:
4581 leaq foo@tlsgd(%rip), %rdi
4582 movabsq $__tls_get_addr@pltoff, %rax
4586 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4589 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
4590 if (ABI_64_P (output_bfd
)
4591 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
4592 memcpy (contents
+ rel
->r_offset
- 3,
4593 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4594 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4595 else if (ABI_64_P (output_bfd
))
4596 memcpy (contents
+ rel
->r_offset
- 3,
4597 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4599 memcpy (contents
+ rel
->r_offset
- 3,
4600 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4601 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4606 if (htab
->elf
.sgot
== NULL
)
4609 off
= htab
->tls_ld_got
.offset
;
4614 Elf_Internal_Rela outrel
;
4616 if (htab
->elf
.srelgot
== NULL
)
4619 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4620 + htab
->elf
.sgot
->output_offset
+ off
);
4622 bfd_put_64 (output_bfd
, 0,
4623 htab
->elf
.sgot
->contents
+ off
);
4624 bfd_put_64 (output_bfd
, 0,
4625 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4626 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
4627 outrel
.r_addend
= 0;
4628 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
4630 htab
->tls_ld_got
.offset
|= 1;
4632 relocation
= htab
->elf
.sgot
->output_section
->vma
4633 + htab
->elf
.sgot
->output_offset
+ off
;
4634 unresolved_reloc
= FALSE
;
4637 case R_X86_64_DTPOFF32
:
4638 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
4639 relocation
-= elf_x86_64_dtpoff_base (info
);
4641 relocation
= elf_x86_64_tpoff (info
, relocation
);
4644 case R_X86_64_TPOFF32
:
4645 case R_X86_64_TPOFF64
:
4646 BFD_ASSERT (info
->executable
);
4647 relocation
= elf_x86_64_tpoff (info
, relocation
);
4650 case R_X86_64_DTPOFF64
:
4651 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
4652 relocation
-= elf_x86_64_dtpoff_base (info
);
4659 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4660 because such sections are not SEC_ALLOC and thus ld.so will
4661 not process them. */
4662 if (unresolved_reloc
4663 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4665 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4666 rel
->r_offset
) != (bfd_vma
) -1)
4668 (*_bfd_error_handler
)
4669 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4672 (long) rel
->r_offset
,
4674 h
->root
.root
.string
);
4679 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4680 contents
, rel
->r_offset
,
4681 relocation
, rel
->r_addend
);
4683 check_relocation_error
:
4684 if (r
!= bfd_reloc_ok
)
4689 name
= h
->root
.root
.string
;
4692 name
= bfd_elf_string_from_elf_section (input_bfd
,
4693 symtab_hdr
->sh_link
,
4698 name
= bfd_section_name (input_bfd
, sec
);
4701 if (r
== bfd_reloc_overflow
)
4703 if (! ((*info
->callbacks
->reloc_overflow
)
4704 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4705 (bfd_vma
) 0, input_bfd
, input_section
,
4711 (*_bfd_error_handler
)
4712 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4713 input_bfd
, input_section
,
4714 (long) rel
->r_offset
, name
, (int) r
);
4723 /* Finish up dynamic symbol handling. We set the contents of various
4724 dynamic sections here. */
4727 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
4728 struct bfd_link_info
*info
,
4729 struct elf_link_hash_entry
*h
,
4730 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
4732 struct elf_x86_64_link_hash_table
*htab
;
4733 const struct elf_x86_64_backend_data
*abed
;
4734 bfd_boolean use_plt_bnd
;
4736 htab
= elf_x86_64_hash_table (info
);
4740 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
4741 section only if there is .plt section. */
4742 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
4744 ? &elf_x86_64_bnd_arch_bed
4745 : get_elf_x86_64_backend_data (output_bfd
));
4747 if (h
->plt
.offset
!= (bfd_vma
) -1)
4750 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
4751 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
4752 Elf_Internal_Rela rela
;
4754 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
4755 const struct elf_backend_data
*bed
;
4757 /* When building a static executable, use .iplt, .igot.plt and
4758 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4759 if (htab
->elf
.splt
!= NULL
)
4761 plt
= htab
->elf
.splt
;
4762 gotplt
= htab
->elf
.sgotplt
;
4763 relplt
= htab
->elf
.srelplt
;
4767 plt
= htab
->elf
.iplt
;
4768 gotplt
= htab
->elf
.igotplt
;
4769 relplt
= htab
->elf
.irelplt
;
4772 /* This symbol has an entry in the procedure linkage table. Set
4774 if ((h
->dynindx
== -1
4775 && !((h
->forced_local
|| info
->executable
)
4777 && h
->type
== STT_GNU_IFUNC
))
4783 /* Get the index in the procedure linkage table which
4784 corresponds to this symbol. This is the index of this symbol
4785 in all the symbols for which we are making plt entries. The
4786 first entry in the procedure linkage table is reserved.
4788 Get the offset into the .got table of the entry that
4789 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4790 bytes. The first three are reserved for the dynamic linker.
4792 For static executables, we don't reserve anything. */
4794 if (plt
== htab
->elf
.splt
)
4796 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
4797 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
4801 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
4802 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
4805 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
4806 plt_plt_offset
= abed
->plt_plt_offset
;
4807 plt_got_insn_size
= abed
->plt_got_insn_size
;
4808 plt_got_offset
= abed
->plt_got_offset
;
4811 /* Use the second PLT with BND relocations. */
4812 const bfd_byte
*plt_entry
, *plt2_entry
;
4813 struct elf_x86_64_link_hash_entry
*eh
4814 = (struct elf_x86_64_link_hash_entry
*) h
;
4816 if (eh
->has_bnd_reloc
)
4818 plt_entry
= elf_x86_64_bnd_plt_entry
;
4819 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
4823 plt_entry
= elf_x86_64_legacy_plt_entry
;
4824 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
4826 /* Subtract 1 since there is no BND prefix. */
4827 plt_plt_insn_end
-= 1;
4828 plt_plt_offset
-= 1;
4829 plt_got_insn_size
-= 1;
4830 plt_got_offset
-= 1;
4833 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
4834 == sizeof (elf_x86_64_legacy_plt_entry
));
4836 /* Fill in the entry in the procedure linkage table. */
4837 memcpy (plt
->contents
+ h
->plt
.offset
,
4838 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
4839 /* Fill in the entry in the second PLT. */
4840 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
4841 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
4843 resolved_plt
= htab
->plt_bnd
;
4844 plt_offset
= eh
->plt_bnd
.offset
;
4848 /* Fill in the entry in the procedure linkage table. */
4849 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
4850 abed
->plt_entry_size
);
4853 plt_offset
= h
->plt
.offset
;
4856 /* Insert the relocation positions of the plt section. */
4858 /* Put offset the PC-relative instruction referring to the GOT entry,
4859 subtracting the size of that instruction. */
4860 bfd_put_32 (output_bfd
,
4861 (gotplt
->output_section
->vma
4862 + gotplt
->output_offset
4864 - resolved_plt
->output_section
->vma
4865 - resolved_plt
->output_offset
4867 - plt_got_insn_size
),
4868 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
4870 /* Fill in the entry in the global offset table, initially this
4871 points to the second part of the PLT entry. */
4872 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4873 + plt
->output_offset
4874 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
4875 gotplt
->contents
+ got_offset
);
4877 /* Fill in the entry in the .rela.plt section. */
4878 rela
.r_offset
= (gotplt
->output_section
->vma
4879 + gotplt
->output_offset
4881 if (h
->dynindx
== -1
4882 || ((info
->executable
4883 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4885 && h
->type
== STT_GNU_IFUNC
))
4887 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4888 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4889 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4890 rela
.r_addend
= (h
->root
.u
.def
.value
4891 + h
->root
.u
.def
.section
->output_section
->vma
4892 + h
->root
.u
.def
.section
->output_offset
);
4893 /* R_X86_64_IRELATIVE comes last. */
4894 plt_index
= htab
->next_irelative_index
--;
4898 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4900 plt_index
= htab
->next_jump_slot_index
++;
4903 /* Don't fill PLT entry for static executables. */
4904 if (plt
== htab
->elf
.splt
)
4906 /* Put relocation index. */
4907 bfd_put_32 (output_bfd
, plt_index
,
4908 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
4909 /* Put offset for jmp .PLT0. */
4910 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ plt_plt_insn_end
),
4911 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
4914 bed
= get_elf_backend_data (output_bfd
);
4915 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4916 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4918 if (!h
->def_regular
)
4920 /* Mark the symbol as undefined, rather than as defined in
4921 the .plt section. Leave the value if there were any
4922 relocations where pointer equality matters (this is a clue
4923 for the dynamic linker, to make function pointer
4924 comparisons work between an application and shared
4925 library), otherwise set it to zero. If a function is only
4926 called from a binary, there is no need to slow down
4927 shared libraries because of that. */
4928 sym
->st_shndx
= SHN_UNDEF
;
4929 if (!h
->pointer_equality_needed
)
4934 if (h
->got
.offset
!= (bfd_vma
) -1
4935 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
4936 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4938 Elf_Internal_Rela rela
;
4940 /* This symbol has an entry in the global offset table. Set it
4942 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4945 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4946 + htab
->elf
.sgot
->output_offset
4947 + (h
->got
.offset
&~ (bfd_vma
) 1));
4949 /* If this is a static link, or it is a -Bsymbolic link and the
4950 symbol is defined locally or was forced to be local because
4951 of a version file, we just want to emit a RELATIVE reloc.
4952 The entry in the global offset table will already have been
4953 initialized in the relocate_section function. */
4955 && h
->type
== STT_GNU_IFUNC
)
4959 /* Generate R_X86_64_GLOB_DAT. */
4966 if (!h
->pointer_equality_needed
)
4969 /* For non-shared object, we can't use .got.plt, which
4970 contains the real function addres if we need pointer
4971 equality. We load the GOT entry with the PLT entry. */
4972 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4973 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4974 + plt
->output_offset
4976 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4980 else if (info
->shared
4981 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4983 if (!h
->def_regular
)
4985 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4986 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4987 rela
.r_addend
= (h
->root
.u
.def
.value
4988 + h
->root
.u
.def
.section
->output_section
->vma
4989 + h
->root
.u
.def
.section
->output_offset
);
4993 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4995 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4996 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4997 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5001 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5006 Elf_Internal_Rela rela
;
5008 /* This symbol needs a copy reloc. Set it up. */
5010 if (h
->dynindx
== -1
5011 || (h
->root
.type
!= bfd_link_hash_defined
5012 && h
->root
.type
!= bfd_link_hash_defweak
)
5013 || htab
->srelbss
== NULL
)
5016 rela
.r_offset
= (h
->root
.u
.def
.value
5017 + h
->root
.u
.def
.section
->output_section
->vma
5018 + h
->root
.u
.def
.section
->output_offset
);
5019 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5021 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5027 /* Finish up local dynamic symbol handling. We set the contents of
5028 various dynamic sections here. */
5031 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5033 struct elf_link_hash_entry
*h
5034 = (struct elf_link_hash_entry
*) *slot
;
5035 struct bfd_link_info
*info
5036 = (struct bfd_link_info
*) inf
;
5038 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5042 /* Used to decide how to sort relocs in an optimal manner for the
5043 dynamic linker, before writing them out. */
5045 static enum elf_reloc_type_class
5046 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5047 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5048 const Elf_Internal_Rela
*rela
)
5050 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5052 case R_X86_64_RELATIVE
:
5053 case R_X86_64_RELATIVE64
:
5054 return reloc_class_relative
;
5055 case R_X86_64_JUMP_SLOT
:
5056 return reloc_class_plt
;
5058 return reloc_class_copy
;
5060 return reloc_class_normal
;
5064 /* Finish up the dynamic sections. */
5067 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5068 struct bfd_link_info
*info
)
5070 struct elf_x86_64_link_hash_table
*htab
;
5073 const struct elf_x86_64_backend_data
*abed
;
5075 htab
= elf_x86_64_hash_table (info
);
5079 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5080 section only if there is .plt section. */
5081 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5082 ? &elf_x86_64_bnd_arch_bed
5083 : get_elf_x86_64_backend_data (output_bfd
));
5085 dynobj
= htab
->elf
.dynobj
;
5086 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5088 if (htab
->elf
.dynamic_sections_created
)
5090 bfd_byte
*dyncon
, *dynconend
;
5091 const struct elf_backend_data
*bed
;
5092 bfd_size_type sizeof_dyn
;
5094 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5097 bed
= get_elf_backend_data (dynobj
);
5098 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5099 dyncon
= sdyn
->contents
;
5100 dynconend
= sdyn
->contents
+ sdyn
->size
;
5101 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5103 Elf_Internal_Dyn dyn
;
5106 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5114 s
= htab
->elf
.sgotplt
;
5115 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5119 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5123 s
= htab
->elf
.srelplt
->output_section
;
5124 dyn
.d_un
.d_val
= s
->size
;
5128 /* The procedure linkage table relocs (DT_JMPREL) should
5129 not be included in the overall relocs (DT_RELA).
5130 Therefore, we override the DT_RELASZ entry here to
5131 make it not include the JMPREL relocs. Since the
5132 linker script arranges for .rela.plt to follow all
5133 other relocation sections, we don't have to worry
5134 about changing the DT_RELA entry. */
5135 if (htab
->elf
.srelplt
!= NULL
)
5137 s
= htab
->elf
.srelplt
->output_section
;
5138 dyn
.d_un
.d_val
-= s
->size
;
5142 case DT_TLSDESC_PLT
:
5144 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5145 + htab
->tlsdesc_plt
;
5148 case DT_TLSDESC_GOT
:
5150 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5151 + htab
->tlsdesc_got
;
5155 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5158 /* Fill in the special first entry in the procedure linkage table. */
5159 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5161 /* Fill in the first entry in the procedure linkage table. */
5162 memcpy (htab
->elf
.splt
->contents
,
5163 abed
->plt0_entry
, abed
->plt_entry_size
);
5164 /* Add offset for pushq GOT+8(%rip), since the instruction
5165 uses 6 bytes subtract this value. */
5166 bfd_put_32 (output_bfd
,
5167 (htab
->elf
.sgotplt
->output_section
->vma
5168 + htab
->elf
.sgotplt
->output_offset
5170 - htab
->elf
.splt
->output_section
->vma
5171 - htab
->elf
.splt
->output_offset
5173 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5174 /* Add offset for the PC-relative instruction accessing GOT+16,
5175 subtracting the offset to the end of that instruction. */
5176 bfd_put_32 (output_bfd
,
5177 (htab
->elf
.sgotplt
->output_section
->vma
5178 + htab
->elf
.sgotplt
->output_offset
5180 - htab
->elf
.splt
->output_section
->vma
5181 - htab
->elf
.splt
->output_offset
5182 - abed
->plt0_got2_insn_end
),
5183 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5185 elf_section_data (htab
->elf
.splt
->output_section
)
5186 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5188 if (htab
->tlsdesc_plt
)
5190 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5191 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5193 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5194 abed
->plt0_entry
, abed
->plt_entry_size
);
5196 /* Add offset for pushq GOT+8(%rip), since the
5197 instruction uses 6 bytes subtract this value. */
5198 bfd_put_32 (output_bfd
,
5199 (htab
->elf
.sgotplt
->output_section
->vma
5200 + htab
->elf
.sgotplt
->output_offset
5202 - htab
->elf
.splt
->output_section
->vma
5203 - htab
->elf
.splt
->output_offset
5206 htab
->elf
.splt
->contents
5207 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5208 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5209 where TGD stands for htab->tlsdesc_got, subtracting the offset
5210 to the end of that instruction. */
5211 bfd_put_32 (output_bfd
,
5212 (htab
->elf
.sgot
->output_section
->vma
5213 + htab
->elf
.sgot
->output_offset
5215 - htab
->elf
.splt
->output_section
->vma
5216 - htab
->elf
.splt
->output_offset
5218 - abed
->plt0_got2_insn_end
),
5219 htab
->elf
.splt
->contents
5220 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5225 if (htab
->plt_bnd
!= NULL
)
5226 elf_section_data (htab
->plt_bnd
->output_section
)
5227 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5229 if (htab
->elf
.sgotplt
)
5231 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5233 (*_bfd_error_handler
)
5234 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5238 /* Fill in the first three entries in the global offset table. */
5239 if (htab
->elf
.sgotplt
->size
> 0)
5241 /* Set the first entry in the global offset table to the address of
5242 the dynamic section. */
5244 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5246 bfd_put_64 (output_bfd
,
5247 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5248 htab
->elf
.sgotplt
->contents
);
5249 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5250 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5251 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5254 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5258 /* Adjust .eh_frame for .plt section. */
5259 if (htab
->plt_eh_frame
!= NULL
5260 && htab
->plt_eh_frame
->contents
!= NULL
)
5262 if (htab
->elf
.splt
!= NULL
5263 && htab
->elf
.splt
->size
!= 0
5264 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5265 && htab
->elf
.splt
->output_section
!= NULL
5266 && htab
->plt_eh_frame
->output_section
!= NULL
)
5268 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5269 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5270 + htab
->plt_eh_frame
->output_offset
5271 + PLT_FDE_START_OFFSET
;
5272 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5273 htab
->plt_eh_frame
->contents
5274 + PLT_FDE_START_OFFSET
);
5276 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5278 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5280 htab
->plt_eh_frame
->contents
))
5285 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5286 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5289 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5290 htab_traverse (htab
->loc_hash_table
,
5291 elf_x86_64_finish_local_dynamic_symbol
,
5297 /* Return address in section PLT for the Ith GOTPLT relocation, for
5298 relocation REL or (bfd_vma) -1 if it should not be included. */
5301 elf_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
5305 const struct elf_x86_64_backend_data
*bed
;
5308 /* Only match R_X86_64_JUMP_SLOT and R_X86_64_IRELATIVE. */
5309 if (rel
->howto
->type
!= R_X86_64_JUMP_SLOT
5310 && rel
->howto
->type
!= R_X86_64_IRELATIVE
)
5311 return (bfd_vma
) -1;
5314 bed
= get_elf_x86_64_backend_data (abfd
);
5315 plt_offset
= bed
->plt_entry_size
;
5317 if (elf_elfheader (abfd
)->e_ident
[EI_OSABI
] != ELFOSABI_GNU
)
5318 return plt
->vma
+ (i
+ 1) * plt_offset
;
5320 while (plt_offset
< plt
->size
)
5322 bfd_vma reloc_index
;
5323 bfd_byte reloc_index_raw
[4];
5325 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5327 plt_offset
+ bed
->plt_reloc_offset
,
5328 sizeof (reloc_index_raw
)))
5329 return (bfd_vma
) -1;
5331 reloc_index
= H_GET_32 (abfd
, reloc_index_raw
);
5332 if (reloc_index
== i
)
5333 return plt
->vma
+ plt_offset
;
5334 plt_offset
+= bed
->plt_entry_size
;
5340 /* Return offset in .plt.bnd section for the Ith GOTPLT relocation with
5341 PLT section, or (bfd_vma) -1 if it should not be included. */
5344 elf_x86_64_plt_sym_val_offset_plt_bnd (bfd_vma i
, const asection
*plt
)
5346 const struct elf_x86_64_backend_data
*bed
= &elf_x86_64_bnd_arch_bed
;
5347 bfd
*abfd
= plt
->owner
;
5348 bfd_vma plt_offset
= bed
->plt_entry_size
;
5350 if (elf_elfheader (abfd
)->e_ident
[EI_OSABI
] != ELFOSABI_GNU
)
5351 return i
* sizeof (elf_x86_64_legacy_plt2_entry
);
5353 while (plt_offset
< plt
->size
)
5355 bfd_vma reloc_index
;
5356 bfd_byte reloc_index_raw
[4];
5358 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5360 plt_offset
+ bed
->plt_reloc_offset
,
5361 sizeof (reloc_index_raw
)))
5362 return (bfd_vma
) -1;
5364 reloc_index
= H_GET_32 (abfd
, reloc_index_raw
);
5365 if (reloc_index
== i
)
5367 /* This is the index in .plt section. */
5368 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
5369 /* Return the offset in .plt.bnd section. */
5370 return (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
);
5372 plt_offset
+= bed
->plt_entry_size
;
5378 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5382 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
5389 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5392 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5396 Elf_Internal_Shdr
*hdr
;
5398 asection
*plt
, *plt_push
;
5400 plt_push
= bfd_get_section_by_name (abfd
, ".plt");
5401 if (plt_push
== NULL
)
5404 plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5405 /* Use the generic ELF version if there is no .plt.bnd section. */
5407 return _bfd_elf_get_synthetic_symtab (abfd
, symcount
, syms
,
5408 dynsymcount
, dynsyms
, ret
);
5412 if ((abfd
->flags
& (DYNAMIC
| EXEC_P
)) == 0)
5415 if (dynsymcount
<= 0)
5418 relplt
= bfd_get_section_by_name (abfd
, ".rela.plt");
5422 hdr
= &elf_section_data (relplt
)->this_hdr
;
5423 if (hdr
->sh_link
!= elf_dynsymtab (abfd
)
5424 || (hdr
->sh_type
!= SHT_REL
&& hdr
->sh_type
!= SHT_RELA
))
5427 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
5428 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
5431 count
= relplt
->size
/ hdr
->sh_entsize
;
5432 size
= count
* sizeof (asymbol
);
5433 p
= relplt
->relocation
;
5434 for (i
= 0; i
< count
; i
++, p
+= bed
->s
->int_rels_per_ext_rel
)
5436 size
+= strlen ((*p
->sym_ptr_ptr
)->name
) + sizeof ("@plt");
5438 size
+= sizeof ("+0x") - 1 + 8 + 8;
5441 s
= *ret
= (asymbol
*) bfd_malloc (size
);
5445 names
= (char *) (s
+ count
);
5446 p
= relplt
->relocation
;
5448 for (i
= 0; i
< count
; i
++, p
++)
5453 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
5454 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
5457 offset
= elf_x86_64_plt_sym_val_offset_plt_bnd (i
, plt_push
);
5459 *s
= **p
->sym_ptr_ptr
;
5460 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
5461 we are defining a symbol, ensure one of them is set. */
5462 if ((s
->flags
& BSF_LOCAL
) == 0)
5463 s
->flags
|= BSF_GLOBAL
;
5464 s
->flags
|= BSF_SYNTHETIC
;
5469 len
= strlen ((*p
->sym_ptr_ptr
)->name
);
5470 memcpy (names
, (*p
->sym_ptr_ptr
)->name
, len
);
5476 memcpy (names
, "+0x", sizeof ("+0x") - 1);
5477 names
+= sizeof ("+0x") - 1;
5478 bfd_sprintf_vma (abfd
, buf
, p
->addend
);
5479 for (a
= buf
; *a
== '0'; ++a
)
5482 memcpy (names
, a
, len
);
5485 memcpy (names
, "@plt", sizeof ("@plt"));
5486 names
+= sizeof ("@plt");
5493 /* Handle an x86-64 specific section when reading an object file. This
5494 is called when elfcode.h finds a section with an unknown type. */
5497 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
5498 const char *name
, int shindex
)
5500 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
5503 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
5509 /* Hook called by the linker routine which adds symbols from an object
5510 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5514 elf_x86_64_add_symbol_hook (bfd
*abfd
,
5515 struct bfd_link_info
*info
,
5516 Elf_Internal_Sym
*sym
,
5517 const char **namep ATTRIBUTE_UNUSED
,
5518 flagword
*flagsp ATTRIBUTE_UNUSED
,
5524 switch (sym
->st_shndx
)
5526 case SHN_X86_64_LCOMMON
:
5527 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
5530 lcomm
= bfd_make_section_with_flags (abfd
,
5534 | SEC_LINKER_CREATED
));
5537 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
5540 *valp
= sym
->st_size
;
5544 if ((ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
5545 || ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
)
5546 && (abfd
->flags
& DYNAMIC
) == 0
5547 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
5548 elf_tdata (info
->output_bfd
)->has_gnu_symbols
= TRUE
;
5554 /* Given a BFD section, try to locate the corresponding ELF section
5558 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
5559 asection
*sec
, int *index_return
)
5561 if (sec
== &_bfd_elf_large_com_section
)
5563 *index_return
= SHN_X86_64_LCOMMON
;
5569 /* Process a symbol. */
5572 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
5575 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
5577 switch (elfsym
->internal_elf_sym
.st_shndx
)
5579 case SHN_X86_64_LCOMMON
:
5580 asym
->section
= &_bfd_elf_large_com_section
;
5581 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
5582 /* Common symbol doesn't set BSF_GLOBAL. */
5583 asym
->flags
&= ~BSF_GLOBAL
;
5589 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
5591 return (sym
->st_shndx
== SHN_COMMON
5592 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
5596 elf_x86_64_common_section_index (asection
*sec
)
5598 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5601 return SHN_X86_64_LCOMMON
;
5605 elf_x86_64_common_section (asection
*sec
)
5607 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5608 return bfd_com_section_ptr
;
5610 return &_bfd_elf_large_com_section
;
5614 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
5615 const Elf_Internal_Sym
*sym
,
5620 const asection
*oldsec
)
5622 /* A normal common symbol and a large common symbol result in a
5623 normal common symbol. We turn the large common symbol into a
5626 && h
->root
.type
== bfd_link_hash_common
5628 && bfd_is_com_section (*psec
)
5631 if (sym
->st_shndx
== SHN_COMMON
5632 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
5634 h
->root
.u
.c
.p
->section
5635 = bfd_make_section_old_way (oldbfd
, "COMMON");
5636 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
5638 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
5639 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
5640 *psec
= bfd_com_section_ptr
;
5647 elf_x86_64_additional_program_headers (bfd
*abfd
,
5648 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
5653 /* Check to see if we need a large readonly segment. */
5654 s
= bfd_get_section_by_name (abfd
, ".lrodata");
5655 if (s
&& (s
->flags
& SEC_LOAD
))
5658 /* Check to see if we need a large data segment. Since .lbss sections
5659 is placed right after the .bss section, there should be no need for
5660 a large data segment just because of .lbss. */
5661 s
= bfd_get_section_by_name (abfd
, ".ldata");
5662 if (s
&& (s
->flags
& SEC_LOAD
))
5668 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5671 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
5673 if (h
->plt
.offset
!= (bfd_vma
) -1
5675 && !h
->pointer_equality_needed
)
5678 return _bfd_elf_hash_symbol (h
);
5681 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5684 elf_x86_64_relocs_compatible (const bfd_target
*input
,
5685 const bfd_target
*output
)
5687 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
5688 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
5689 && _bfd_elf_relocs_compatible (input
, output
));
5692 static const struct bfd_elf_special_section
5693 elf_x86_64_special_sections
[]=
5695 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5696 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5697 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
5698 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5699 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5700 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5701 { NULL
, 0, 0, 0, 0 }
5704 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5705 #define TARGET_LITTLE_NAME "elf64-x86-64"
5706 #define ELF_ARCH bfd_arch_i386
5707 #define ELF_TARGET_ID X86_64_ELF_DATA
5708 #define ELF_MACHINE_CODE EM_X86_64
5709 #define ELF_MAXPAGESIZE 0x200000
5710 #define ELF_MINPAGESIZE 0x1000
5711 #define ELF_COMMONPAGESIZE 0x1000
5713 #define elf_backend_can_gc_sections 1
5714 #define elf_backend_can_refcount 1
5715 #define elf_backend_want_got_plt 1
5716 #define elf_backend_plt_readonly 1
5717 #define elf_backend_want_plt_sym 0
5718 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5719 #define elf_backend_rela_normal 1
5720 #define elf_backend_plt_alignment 4
5722 #define elf_info_to_howto elf_x86_64_info_to_howto
5724 #define bfd_elf64_bfd_link_hash_table_create \
5725 elf_x86_64_link_hash_table_create
5726 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5727 #define bfd_elf64_bfd_reloc_name_lookup \
5728 elf_x86_64_reloc_name_lookup
5730 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5731 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5732 #define elf_backend_check_relocs elf_x86_64_check_relocs
5733 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5734 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5735 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5736 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5737 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5738 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5739 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5740 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5742 #define elf_backend_write_core_note elf_x86_64_write_core_note
5744 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5745 #define elf_backend_relocate_section elf_x86_64_relocate_section
5746 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5747 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5748 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5749 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5750 #define elf_backend_object_p elf64_x86_64_elf_object_p
5751 #define bfd_elf64_mkobject elf_x86_64_mkobject
5752 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5754 #define elf_backend_section_from_shdr \
5755 elf_x86_64_section_from_shdr
5757 #define elf_backend_section_from_bfd_section \
5758 elf_x86_64_elf_section_from_bfd_section
5759 #define elf_backend_add_symbol_hook \
5760 elf_x86_64_add_symbol_hook
5761 #define elf_backend_symbol_processing \
5762 elf_x86_64_symbol_processing
5763 #define elf_backend_common_section_index \
5764 elf_x86_64_common_section_index
5765 #define elf_backend_common_section \
5766 elf_x86_64_common_section
5767 #define elf_backend_common_definition \
5768 elf_x86_64_common_definition
5769 #define elf_backend_merge_symbol \
5770 elf_x86_64_merge_symbol
5771 #define elf_backend_special_sections \
5772 elf_x86_64_special_sections
5773 #define elf_backend_additional_program_headers \
5774 elf_x86_64_additional_program_headers
5775 #define elf_backend_hash_symbol \
5776 elf_x86_64_hash_symbol
5778 #include "elf64-target.h"
5780 /* FreeBSD support. */
5782 #undef TARGET_LITTLE_SYM
5783 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5784 #undef TARGET_LITTLE_NAME
5785 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5788 #define ELF_OSABI ELFOSABI_FREEBSD
5791 #define elf64_bed elf64_x86_64_fbsd_bed
5793 #include "elf64-target.h"
5795 /* Solaris 2 support. */
5797 #undef TARGET_LITTLE_SYM
5798 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5799 #undef TARGET_LITTLE_NAME
5800 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5802 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5803 objects won't be recognized. */
5807 #define elf64_bed elf64_x86_64_sol2_bed
5809 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5811 #undef elf_backend_static_tls_alignment
5812 #define elf_backend_static_tls_alignment 16
5814 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5816 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5818 #undef elf_backend_want_plt_sym
5819 #define elf_backend_want_plt_sym 1
5821 #include "elf64-target.h"
5823 #undef bfd_elf64_get_synthetic_symtab
5825 /* Native Client support. */
5828 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
5830 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
5831 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
5835 #undef TARGET_LITTLE_SYM
5836 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
5837 #undef TARGET_LITTLE_NAME
5838 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5840 #define elf64_bed elf64_x86_64_nacl_bed
5842 #undef ELF_MAXPAGESIZE
5843 #undef ELF_MINPAGESIZE
5844 #undef ELF_COMMONPAGESIZE
5845 #define ELF_MAXPAGESIZE 0x10000
5846 #define ELF_MINPAGESIZE 0x10000
5847 #define ELF_COMMONPAGESIZE 0x10000
5849 /* Restore defaults. */
5851 #undef elf_backend_static_tls_alignment
5852 #undef elf_backend_want_plt_sym
5853 #define elf_backend_want_plt_sym 0
5855 /* NaCl uses substantially different PLT entries for the same effects. */
5857 #undef elf_backend_plt_alignment
5858 #define elf_backend_plt_alignment 5
5859 #define NACL_PLT_ENTRY_SIZE 64
5860 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5862 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
5864 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5865 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5866 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
5867 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5868 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5870 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5871 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
5873 /* 32 bytes of nop to pad out to the standard size. */
5874 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5875 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5876 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5877 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5878 0x66, /* excess data32 prefix */
5882 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
5884 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5885 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
5886 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5887 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5889 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5890 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5891 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5893 /* Lazy GOT entries point here (32-byte aligned). */
5894 0x68, /* pushq immediate */
5895 0, 0, 0, 0, /* replaced with index into relocation table. */
5896 0xe9, /* jmp relative */
5897 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5899 /* 22 bytes of nop to pad out to the standard size. */
5900 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5901 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5902 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5905 /* .eh_frame covering the .plt section. */
5907 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
5909 #if (PLT_CIE_LENGTH != 20 \
5910 || PLT_FDE_LENGTH != 36 \
5911 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5912 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5913 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5915 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
5916 0, 0, 0, 0, /* CIE ID */
5917 1, /* CIE version */
5918 'z', 'R', 0, /* Augmentation string */
5919 1, /* Code alignment factor */
5920 0x78, /* Data alignment factor */
5921 16, /* Return address column */
5922 1, /* Augmentation size */
5923 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
5924 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5925 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5926 DW_CFA_nop
, DW_CFA_nop
,
5928 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
5929 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
5930 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5931 0, 0, 0, 0, /* .plt size goes here */
5932 0, /* Augmentation size */
5933 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
5934 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5935 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
5936 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5937 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
5938 13, /* Block length */
5939 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
5940 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
5941 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
5942 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
5943 DW_CFA_nop
, DW_CFA_nop
5946 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
5948 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
5949 elf_x86_64_nacl_plt_entry
, /* plt_entry */
5950 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
5951 2, /* plt0_got1_offset */
5952 9, /* plt0_got2_offset */
5953 13, /* plt0_got2_insn_end */
5954 3, /* plt_got_offset */
5955 33, /* plt_reloc_offset */
5956 38, /* plt_plt_offset */
5957 7, /* plt_got_insn_size */
5958 42, /* plt_plt_insn_end */
5959 32, /* plt_lazy_offset */
5960 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
5961 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
5964 #undef elf_backend_arch_data
5965 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5967 #undef elf_backend_object_p
5968 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
5969 #undef elf_backend_modify_segment_map
5970 #define elf_backend_modify_segment_map nacl_modify_segment_map
5971 #undef elf_backend_modify_program_headers
5972 #define elf_backend_modify_program_headers nacl_modify_program_headers
5973 #undef elf_backend_final_write_processing
5974 #define elf_backend_final_write_processing nacl_final_write_processing
5976 #include "elf64-target.h"
5978 /* Native Client x32 support. */
5981 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
5983 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
5984 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
5988 #undef TARGET_LITTLE_SYM
5989 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
5990 #undef TARGET_LITTLE_NAME
5991 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5993 #define elf32_bed elf32_x86_64_nacl_bed
5995 #define bfd_elf32_bfd_link_hash_table_create \
5996 elf_x86_64_link_hash_table_create
5997 #define bfd_elf32_bfd_reloc_type_lookup \
5998 elf_x86_64_reloc_type_lookup
5999 #define bfd_elf32_bfd_reloc_name_lookup \
6000 elf_x86_64_reloc_name_lookup
6001 #define bfd_elf32_mkobject \
6004 #undef elf_backend_object_p
6005 #define elf_backend_object_p \
6006 elf32_x86_64_nacl_elf_object_p
6008 #undef elf_backend_bfd_from_remote_memory
6009 #define elf_backend_bfd_from_remote_memory \
6010 _bfd_elf32_bfd_from_remote_memory
6012 #undef elf_backend_size_info
6013 #define elf_backend_size_info \
6014 _bfd_elf32_size_info
6016 #include "elf32-target.h"
6018 /* Restore defaults. */
6019 #undef elf_backend_object_p
6020 #define elf_backend_object_p elf64_x86_64_elf_object_p
6021 #undef elf_backend_bfd_from_remote_memory
6022 #undef elf_backend_size_info
6023 #undef elf_backend_modify_segment_map
6024 #undef elf_backend_modify_program_headers
6025 #undef elf_backend_final_write_processing
6027 /* Intel L1OM support. */
6030 elf64_l1om_elf_object_p (bfd
*abfd
)
6032 /* Set the right machine number for an L1OM elf64 file. */
6033 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6037 #undef TARGET_LITTLE_SYM
6038 #define TARGET_LITTLE_SYM l1om_elf64_vec
6039 #undef TARGET_LITTLE_NAME
6040 #define TARGET_LITTLE_NAME "elf64-l1om"
6042 #define ELF_ARCH bfd_arch_l1om
6044 #undef ELF_MACHINE_CODE
6045 #define ELF_MACHINE_CODE EM_L1OM
6050 #define elf64_bed elf64_l1om_bed
6052 #undef elf_backend_object_p
6053 #define elf_backend_object_p elf64_l1om_elf_object_p
6055 /* Restore defaults. */
6056 #undef ELF_MAXPAGESIZE
6057 #undef ELF_MINPAGESIZE
6058 #undef ELF_COMMONPAGESIZE
6059 #define ELF_MAXPAGESIZE 0x200000
6060 #define ELF_MINPAGESIZE 0x1000
6061 #define ELF_COMMONPAGESIZE 0x1000
6062 #undef elf_backend_plt_alignment
6063 #define elf_backend_plt_alignment 4
6064 #undef elf_backend_arch_data
6065 #define elf_backend_arch_data &elf_x86_64_arch_bed
6067 #include "elf64-target.h"
6069 /* FreeBSD L1OM support. */
6071 #undef TARGET_LITTLE_SYM
6072 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6073 #undef TARGET_LITTLE_NAME
6074 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6077 #define ELF_OSABI ELFOSABI_FREEBSD
6080 #define elf64_bed elf64_l1om_fbsd_bed
6082 #include "elf64-target.h"
6084 /* Intel K1OM support. */
6087 elf64_k1om_elf_object_p (bfd
*abfd
)
6089 /* Set the right machine number for an K1OM elf64 file. */
6090 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6094 #undef TARGET_LITTLE_SYM
6095 #define TARGET_LITTLE_SYM k1om_elf64_vec
6096 #undef TARGET_LITTLE_NAME
6097 #define TARGET_LITTLE_NAME "elf64-k1om"
6099 #define ELF_ARCH bfd_arch_k1om
6101 #undef ELF_MACHINE_CODE
6102 #define ELF_MACHINE_CODE EM_K1OM
6107 #define elf64_bed elf64_k1om_bed
6109 #undef elf_backend_object_p
6110 #define elf_backend_object_p elf64_k1om_elf_object_p
6112 #undef elf_backend_static_tls_alignment
6114 #undef elf_backend_want_plt_sym
6115 #define elf_backend_want_plt_sym 0
6117 #include "elf64-target.h"
6119 /* FreeBSD K1OM support. */
6121 #undef TARGET_LITTLE_SYM
6122 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6123 #undef TARGET_LITTLE_NAME
6124 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6127 #define ELF_OSABI ELFOSABI_FREEBSD
6130 #define elf64_bed elf64_k1om_fbsd_bed
6132 #include "elf64-target.h"
6134 /* 32bit x86-64 support. */
6136 #undef TARGET_LITTLE_SYM
6137 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6138 #undef TARGET_LITTLE_NAME
6139 #define TARGET_LITTLE_NAME "elf32-x86-64"
6143 #define ELF_ARCH bfd_arch_i386
6145 #undef ELF_MACHINE_CODE
6146 #define ELF_MACHINE_CODE EM_X86_64
6150 #undef elf_backend_object_p
6151 #define elf_backend_object_p \
6152 elf32_x86_64_elf_object_p
6154 #undef elf_backend_bfd_from_remote_memory
6155 #define elf_backend_bfd_from_remote_memory \
6156 _bfd_elf32_bfd_from_remote_memory
6158 #undef elf_backend_size_info
6159 #define elf_backend_size_info \
6160 _bfd_elf32_size_info
6162 #include "elf32-target.h"