1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "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, 3, 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 a weak symbol with a real definition needs a copy reloc.
761 When there is a weak symbol with a real definition, the processor
762 independent code will have arranged for us to see the real
763 definition first. We need to copy the needs_copy bit from the
764 real definition and check it when allowing copy reloc in PIE. */
765 unsigned int needs_copy
: 1;
767 /* TRUE if symbol has at least one BND relocation. */
768 unsigned int has_bnd_reloc
: 1;
770 /* Reference count of C/C++ function pointer relocations in read-write
771 section which can be resolved at run-time. */
772 bfd_signed_vma func_pointer_refcount
;
774 /* Information about the GOT PLT entry. Filled when there are both
775 GOT and PLT relocations against the same function. */
776 union gotplt_union plt_got
;
778 /* Information about the second PLT entry. Filled when has_bnd_reloc is
780 union gotplt_union plt_bnd
;
782 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
783 starting at the end of the jump table. */
787 #define elf_x86_64_hash_entry(ent) \
788 ((struct elf_x86_64_link_hash_entry *)(ent))
790 struct elf_x86_64_obj_tdata
792 struct elf_obj_tdata root
;
794 /* tls_type for each local got entry. */
795 char *local_got_tls_type
;
797 /* GOTPLT entries for TLS descriptors. */
798 bfd_vma
*local_tlsdesc_gotent
;
801 #define elf_x86_64_tdata(abfd) \
802 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
804 #define elf_x86_64_local_got_tls_type(abfd) \
805 (elf_x86_64_tdata (abfd)->local_got_tls_type)
807 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
808 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
810 #define is_x86_64_elf(bfd) \
811 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
812 && elf_tdata (bfd) != NULL \
813 && elf_object_id (bfd) == X86_64_ELF_DATA)
816 elf_x86_64_mkobject (bfd
*abfd
)
818 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
822 /* x86-64 ELF linker hash table. */
824 struct elf_x86_64_link_hash_table
826 struct elf_link_hash_table elf
;
828 /* Short-cuts to get to dynamic linker sections. */
831 asection
*plt_eh_frame
;
837 bfd_signed_vma refcount
;
841 /* The amount of space used by the jump slots in the GOT. */
842 bfd_vma sgotplt_jump_table_size
;
844 /* Small local sym cache. */
845 struct sym_cache sym_cache
;
847 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
848 bfd_vma (*r_sym
) (bfd_vma
);
849 unsigned int pointer_r_type
;
850 const char *dynamic_interpreter
;
851 int dynamic_interpreter_size
;
853 /* _TLS_MODULE_BASE_ symbol. */
854 struct bfd_link_hash_entry
*tls_module_base
;
856 /* Used by local STT_GNU_IFUNC symbols. */
857 htab_t loc_hash_table
;
858 void * loc_hash_memory
;
860 /* The offset into splt of the PLT entry for the TLS descriptor
861 resolver. Special values are 0, if not necessary (or not found
862 to be necessary yet), and -1 if needed but not determined
865 /* The offset into sgot of the GOT entry used by the PLT entry
869 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
870 bfd_vma next_jump_slot_index
;
871 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
872 bfd_vma next_irelative_index
;
875 /* Get the x86-64 ELF linker hash table from a link_info structure. */
877 #define elf_x86_64_hash_table(p) \
878 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
879 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
881 #define elf_x86_64_compute_jump_table_size(htab) \
882 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
884 /* Create an entry in an x86-64 ELF linker hash table. */
886 static struct bfd_hash_entry
*
887 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
888 struct bfd_hash_table
*table
,
891 /* Allocate the structure if it has not already been allocated by a
895 entry
= (struct bfd_hash_entry
*)
896 bfd_hash_allocate (table
,
897 sizeof (struct elf_x86_64_link_hash_entry
));
902 /* Call the allocation method of the superclass. */
903 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
906 struct elf_x86_64_link_hash_entry
*eh
;
908 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
909 eh
->dyn_relocs
= NULL
;
910 eh
->tls_type
= GOT_UNKNOWN
;
912 eh
->has_bnd_reloc
= 0;
913 eh
->func_pointer_refcount
= 0;
914 eh
->plt_bnd
.offset
= (bfd_vma
) -1;
915 eh
->plt_got
.offset
= (bfd_vma
) -1;
916 eh
->tlsdesc_got
= (bfd_vma
) -1;
922 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
923 for local symbol so that we can handle local STT_GNU_IFUNC symbols
924 as global symbol. We reuse indx and dynstr_index for local symbol
925 hash since they aren't used by global symbols in this backend. */
928 elf_x86_64_local_htab_hash (const void *ptr
)
930 struct elf_link_hash_entry
*h
931 = (struct elf_link_hash_entry
*) ptr
;
932 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
935 /* Compare local hash entries. */
938 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
940 struct elf_link_hash_entry
*h1
941 = (struct elf_link_hash_entry
*) ptr1
;
942 struct elf_link_hash_entry
*h2
943 = (struct elf_link_hash_entry
*) ptr2
;
945 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
948 /* Find and/or create a hash entry for local symbol. */
950 static struct elf_link_hash_entry
*
951 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
952 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
955 struct elf_x86_64_link_hash_entry e
, *ret
;
956 asection
*sec
= abfd
->sections
;
957 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
958 htab
->r_sym (rel
->r_info
));
961 e
.elf
.indx
= sec
->id
;
962 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
963 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
964 create
? INSERT
: NO_INSERT
);
971 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
975 ret
= (struct elf_x86_64_link_hash_entry
*)
976 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
977 sizeof (struct elf_x86_64_link_hash_entry
));
980 memset (ret
, 0, sizeof (*ret
));
981 ret
->elf
.indx
= sec
->id
;
982 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
983 ret
->elf
.dynindx
= -1;
984 ret
->func_pointer_refcount
= 0;
985 ret
->plt_got
.offset
= (bfd_vma
) -1;
991 /* Destroy an X86-64 ELF linker hash table. */
994 elf_x86_64_link_hash_table_free (bfd
*obfd
)
996 struct elf_x86_64_link_hash_table
*htab
997 = (struct elf_x86_64_link_hash_table
*) obfd
->link
.hash
;
999 if (htab
->loc_hash_table
)
1000 htab_delete (htab
->loc_hash_table
);
1001 if (htab
->loc_hash_memory
)
1002 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
1003 _bfd_elf_link_hash_table_free (obfd
);
1006 /* Create an X86-64 ELF linker hash table. */
1008 static struct bfd_link_hash_table
*
1009 elf_x86_64_link_hash_table_create (bfd
*abfd
)
1011 struct elf_x86_64_link_hash_table
*ret
;
1012 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
1014 ret
= (struct elf_x86_64_link_hash_table
*) bfd_zmalloc (amt
);
1018 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1019 elf_x86_64_link_hash_newfunc
,
1020 sizeof (struct elf_x86_64_link_hash_entry
),
1027 if (ABI_64_P (abfd
))
1029 ret
->r_info
= elf64_r_info
;
1030 ret
->r_sym
= elf64_r_sym
;
1031 ret
->pointer_r_type
= R_X86_64_64
;
1032 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
1033 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
1037 ret
->r_info
= elf32_r_info
;
1038 ret
->r_sym
= elf32_r_sym
;
1039 ret
->pointer_r_type
= R_X86_64_32
;
1040 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
1041 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
1044 ret
->loc_hash_table
= htab_try_create (1024,
1045 elf_x86_64_local_htab_hash
,
1046 elf_x86_64_local_htab_eq
,
1048 ret
->loc_hash_memory
= objalloc_create ();
1049 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1051 elf_x86_64_link_hash_table_free (abfd
);
1054 ret
->elf
.root
.hash_table_free
= elf_x86_64_link_hash_table_free
;
1056 return &ret
->elf
.root
;
1059 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1060 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1064 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
1065 struct bfd_link_info
*info
)
1067 struct elf_x86_64_link_hash_table
*htab
;
1069 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1072 htab
= elf_x86_64_hash_table (info
);
1076 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
1080 if (bfd_link_executable (info
))
1082 /* Always allow copy relocs for building executables. */
1083 asection
*s
= bfd_get_linker_section (dynobj
, ".rela.bss");
1086 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
1087 s
= bfd_make_section_anyway_with_flags (dynobj
,
1089 (bed
->dynamic_sec_flags
1092 || ! bfd_set_section_alignment (dynobj
, s
,
1093 bed
->s
->log_file_align
))
1099 if (!info
->no_ld_generated_unwind_info
1100 && htab
->plt_eh_frame
== NULL
1101 && htab
->elf
.splt
!= NULL
)
1103 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1104 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1105 | SEC_LINKER_CREATED
);
1107 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1108 if (htab
->plt_eh_frame
== NULL
1109 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
1115 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1118 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1119 struct elf_link_hash_entry
*dir
,
1120 struct elf_link_hash_entry
*ind
)
1122 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1124 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1125 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1127 if (!edir
->has_bnd_reloc
)
1128 edir
->has_bnd_reloc
= eind
->has_bnd_reloc
;
1130 if (eind
->dyn_relocs
!= NULL
)
1132 if (edir
->dyn_relocs
!= NULL
)
1134 struct elf_dyn_relocs
**pp
;
1135 struct elf_dyn_relocs
*p
;
1137 /* Add reloc counts against the indirect sym to the direct sym
1138 list. Merge any entries against the same section. */
1139 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1141 struct elf_dyn_relocs
*q
;
1143 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1144 if (q
->sec
== p
->sec
)
1146 q
->pc_count
+= p
->pc_count
;
1147 q
->count
+= p
->count
;
1154 *pp
= edir
->dyn_relocs
;
1157 edir
->dyn_relocs
= eind
->dyn_relocs
;
1158 eind
->dyn_relocs
= NULL
;
1161 if (ind
->root
.type
== bfd_link_hash_indirect
1162 && dir
->got
.refcount
<= 0)
1164 edir
->tls_type
= eind
->tls_type
;
1165 eind
->tls_type
= GOT_UNKNOWN
;
1168 if (ELIMINATE_COPY_RELOCS
1169 && ind
->root
.type
!= bfd_link_hash_indirect
1170 && dir
->dynamic_adjusted
)
1172 /* If called to transfer flags for a weakdef during processing
1173 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1174 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1175 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1176 dir
->ref_regular
|= ind
->ref_regular
;
1177 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1178 dir
->needs_plt
|= ind
->needs_plt
;
1179 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1183 if (eind
->func_pointer_refcount
> 0)
1185 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1186 eind
->func_pointer_refcount
= 0;
1189 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1194 elf64_x86_64_elf_object_p (bfd
*abfd
)
1196 /* Set the right machine number for an x86-64 elf64 file. */
1197 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1202 elf32_x86_64_elf_object_p (bfd
*abfd
)
1204 /* Set the right machine number for an x86-64 elf32 file. */
1205 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1209 /* Return TRUE if the TLS access code sequence support transition
1213 elf_x86_64_check_tls_transition (bfd
*abfd
,
1214 struct bfd_link_info
*info
,
1217 Elf_Internal_Shdr
*symtab_hdr
,
1218 struct elf_link_hash_entry
**sym_hashes
,
1219 unsigned int r_type
,
1220 const Elf_Internal_Rela
*rel
,
1221 const Elf_Internal_Rela
*relend
)
1224 unsigned long r_symndx
;
1225 bfd_boolean largepic
= FALSE
;
1226 struct elf_link_hash_entry
*h
;
1228 struct elf_x86_64_link_hash_table
*htab
;
1230 /* Get the section contents. */
1231 if (contents
== NULL
)
1233 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1234 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1237 /* FIXME: How to better handle error condition? */
1238 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1241 /* Cache the section contents for elf_link_input_bfd. */
1242 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1246 htab
= elf_x86_64_hash_table (info
);
1247 offset
= rel
->r_offset
;
1250 case R_X86_64_TLSGD
:
1251 case R_X86_64_TLSLD
:
1252 if ((rel
+ 1) >= relend
)
1255 if (r_type
== R_X86_64_TLSGD
)
1257 /* Check transition from GD access model. For 64bit, only
1258 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1259 .word 0x6666; rex64; call __tls_get_addr
1260 can transit to different access model. For 32bit, only
1261 leaq foo@tlsgd(%rip), %rdi
1262 .word 0x6666; rex64; call __tls_get_addr
1263 can transit to different access model. For largepic
1265 leaq foo@tlsgd(%rip), %rdi
1266 movabsq $__tls_get_addr@pltoff, %rax
1270 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1271 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1273 if ((offset
+ 12) > sec
->size
)
1276 if (memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1278 if (!ABI_64_P (abfd
)
1279 || (offset
+ 19) > sec
->size
1281 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0
1282 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1283 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1288 else if (ABI_64_P (abfd
))
1291 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1297 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1303 /* Check transition from LD access model. Only
1304 leaq foo@tlsld(%rip), %rdi;
1306 can transit to different access model. For largepic
1308 leaq foo@tlsld(%rip), %rdi
1309 movabsq $__tls_get_addr@pltoff, %rax
1313 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1315 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1318 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1321 if (0xe8 != *(contents
+ offset
+ 4))
1323 if (!ABI_64_P (abfd
)
1324 || (offset
+ 19) > sec
->size
1325 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1326 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1333 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1334 if (r_symndx
< symtab_hdr
->sh_info
)
1337 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1338 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1339 may be versioned. */
1341 && h
->root
.root
.string
!= NULL
1343 ? ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
1344 : (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1345 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
))
1346 && (strncmp (h
->root
.root
.string
,
1347 "__tls_get_addr", 14) == 0));
1349 case R_X86_64_GOTTPOFF
:
1350 /* Check transition from IE access model:
1351 mov foo@gottpoff(%rip), %reg
1352 add foo@gottpoff(%rip), %reg
1355 /* Check REX prefix first. */
1356 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1358 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1359 if (val
!= 0x48 && val
!= 0x4c)
1361 /* X32 may have 0x44 REX prefix or no REX prefix. */
1362 if (ABI_64_P (abfd
))
1368 /* X32 may not have any REX prefix. */
1369 if (ABI_64_P (abfd
))
1371 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1375 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1376 if (val
!= 0x8b && val
!= 0x03)
1379 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1380 return (val
& 0xc7) == 5;
1382 case R_X86_64_GOTPC32_TLSDESC
:
1383 /* Check transition from GDesc access model:
1384 leaq x@tlsdesc(%rip), %rax
1386 Make sure it's a leaq adding rip to a 32-bit offset
1387 into any register, although it's probably almost always
1390 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1393 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1394 if ((val
& 0xfb) != 0x48)
1397 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1400 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1401 return (val
& 0xc7) == 0x05;
1403 case R_X86_64_TLSDESC_CALL
:
1404 /* Check transition from GDesc access model:
1405 call *x@tlsdesc(%rax)
1407 if (offset
+ 2 <= sec
->size
)
1409 /* Make sure that it's a call *x@tlsdesc(%rax). */
1410 static const unsigned char call
[] = { 0xff, 0x10 };
1411 return memcmp (contents
+ offset
, call
, 2) == 0;
1421 /* Return TRUE if the TLS access transition is OK or no transition
1422 will be performed. Update R_TYPE if there is a transition. */
1425 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1426 asection
*sec
, bfd_byte
*contents
,
1427 Elf_Internal_Shdr
*symtab_hdr
,
1428 struct elf_link_hash_entry
**sym_hashes
,
1429 unsigned int *r_type
, int tls_type
,
1430 const Elf_Internal_Rela
*rel
,
1431 const Elf_Internal_Rela
*relend
,
1432 struct elf_link_hash_entry
*h
,
1433 unsigned long r_symndx
)
1435 unsigned int from_type
= *r_type
;
1436 unsigned int to_type
= from_type
;
1437 bfd_boolean check
= TRUE
;
1439 /* Skip TLS transition for functions. */
1441 && (h
->type
== STT_FUNC
1442 || h
->type
== STT_GNU_IFUNC
))
1447 case R_X86_64_TLSGD
:
1448 case R_X86_64_GOTPC32_TLSDESC
:
1449 case R_X86_64_TLSDESC_CALL
:
1450 case R_X86_64_GOTTPOFF
:
1451 if (bfd_link_executable (info
))
1454 to_type
= R_X86_64_TPOFF32
;
1456 to_type
= R_X86_64_GOTTPOFF
;
1459 /* When we are called from elf_x86_64_relocate_section,
1460 CONTENTS isn't NULL and there may be additional transitions
1461 based on TLS_TYPE. */
1462 if (contents
!= NULL
)
1464 unsigned int new_to_type
= to_type
;
1466 if (bfd_link_executable (info
)
1469 && tls_type
== GOT_TLS_IE
)
1470 new_to_type
= R_X86_64_TPOFF32
;
1472 if (to_type
== R_X86_64_TLSGD
1473 || to_type
== R_X86_64_GOTPC32_TLSDESC
1474 || to_type
== R_X86_64_TLSDESC_CALL
)
1476 if (tls_type
== GOT_TLS_IE
)
1477 new_to_type
= R_X86_64_GOTTPOFF
;
1480 /* We checked the transition before when we were called from
1481 elf_x86_64_check_relocs. We only want to check the new
1482 transition which hasn't been checked before. */
1483 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1484 to_type
= new_to_type
;
1489 case R_X86_64_TLSLD
:
1490 if (bfd_link_executable (info
))
1491 to_type
= R_X86_64_TPOFF32
;
1498 /* Return TRUE if there is no transition. */
1499 if (from_type
== to_type
)
1502 /* Check if the transition can be performed. */
1504 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1505 symtab_hdr
, sym_hashes
,
1506 from_type
, rel
, relend
))
1508 reloc_howto_type
*from
, *to
;
1511 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1512 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1515 name
= h
->root
.root
.string
;
1518 struct elf_x86_64_link_hash_table
*htab
;
1520 htab
= elf_x86_64_hash_table (info
);
1525 Elf_Internal_Sym
*isym
;
1527 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1529 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1533 (*_bfd_error_handler
)
1534 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1535 "in section `%A' failed"),
1536 abfd
, sec
, from
->name
, to
->name
, name
,
1537 (unsigned long) rel
->r_offset
);
1538 bfd_set_error (bfd_error_bad_value
);
1546 /* Rename some of the generic section flags to better document how they
1548 #define need_convert_mov_to_lea sec_flg0
1550 /* Look through the relocs for a section during the first phase, and
1551 calculate needed space in the global offset table, procedure
1552 linkage table, and dynamic reloc sections. */
1555 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1557 const Elf_Internal_Rela
*relocs
)
1559 struct elf_x86_64_link_hash_table
*htab
;
1560 Elf_Internal_Shdr
*symtab_hdr
;
1561 struct elf_link_hash_entry
**sym_hashes
;
1562 const Elf_Internal_Rela
*rel
;
1563 const Elf_Internal_Rela
*rel_end
;
1565 bfd_boolean use_plt_got
;
1567 if (bfd_link_relocatable (info
))
1570 BFD_ASSERT (is_x86_64_elf (abfd
));
1572 htab
= elf_x86_64_hash_table (info
);
1576 use_plt_got
= get_elf_x86_64_backend_data (abfd
) == &elf_x86_64_arch_bed
;
1578 symtab_hdr
= &elf_symtab_hdr (abfd
);
1579 sym_hashes
= elf_sym_hashes (abfd
);
1583 rel_end
= relocs
+ sec
->reloc_count
;
1584 for (rel
= relocs
; rel
< rel_end
; rel
++)
1586 unsigned int r_type
;
1587 unsigned long r_symndx
;
1588 struct elf_link_hash_entry
*h
;
1589 Elf_Internal_Sym
*isym
;
1591 bfd_boolean size_reloc
;
1593 r_symndx
= htab
->r_sym (rel
->r_info
);
1594 r_type
= ELF32_R_TYPE (rel
->r_info
);
1596 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1598 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1603 if (r_symndx
< symtab_hdr
->sh_info
)
1605 /* A local symbol. */
1606 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1611 /* Check relocation against local STT_GNU_IFUNC symbol. */
1612 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1614 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1619 /* Fake a STT_GNU_IFUNC symbol. */
1620 h
->type
= STT_GNU_IFUNC
;
1623 h
->forced_local
= 1;
1624 h
->root
.type
= bfd_link_hash_defined
;
1632 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1633 while (h
->root
.type
== bfd_link_hash_indirect
1634 || h
->root
.type
== bfd_link_hash_warning
)
1635 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1638 /* Check invalid x32 relocations. */
1639 if (!ABI_64_P (abfd
))
1645 case R_X86_64_DTPOFF64
:
1646 case R_X86_64_TPOFF64
:
1648 case R_X86_64_GOTOFF64
:
1649 case R_X86_64_GOT64
:
1650 case R_X86_64_GOTPCREL64
:
1651 case R_X86_64_GOTPC64
:
1652 case R_X86_64_GOTPLT64
:
1653 case R_X86_64_PLTOFF64
:
1656 name
= h
->root
.root
.string
;
1658 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1660 (*_bfd_error_handler
)
1661 (_("%B: relocation %s against symbol `%s' isn't "
1662 "supported in x32 mode"), abfd
,
1663 x86_64_elf_howto_table
[r_type
].name
, name
);
1664 bfd_set_error (bfd_error_bad_value
);
1672 /* Create the ifunc sections for static executables. If we
1673 never see an indirect function symbol nor we are building
1674 a static executable, those sections will be empty and
1675 won't appear in output. */
1681 case R_X86_64_PC32_BND
:
1682 case R_X86_64_PLT32_BND
:
1684 case R_X86_64_PLT32
:
1687 /* MPX PLT is supported only if elf_x86_64_arch_bed
1688 is used in 64-bit mode. */
1691 && (get_elf_x86_64_backend_data (abfd
)
1692 == &elf_x86_64_arch_bed
))
1694 elf_x86_64_hash_entry (h
)->has_bnd_reloc
= 1;
1696 /* Create the second PLT for Intel MPX support. */
1697 if (htab
->plt_bnd
== NULL
)
1699 unsigned int plt_bnd_align
;
1700 const struct elf_backend_data
*bed
;
1702 bed
= get_elf_backend_data (info
->output_bfd
);
1703 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
) == 8
1704 && (sizeof (elf_x86_64_bnd_plt2_entry
)
1705 == sizeof (elf_x86_64_legacy_plt2_entry
)));
1708 if (htab
->elf
.dynobj
== NULL
)
1709 htab
->elf
.dynobj
= abfd
;
1711 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1713 (bed
->dynamic_sec_flags
1718 if (htab
->plt_bnd
== NULL
1719 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
1728 case R_X86_64_GOTPCREL
:
1729 case R_X86_64_GOTPCREL64
:
1730 if (htab
->elf
.dynobj
== NULL
)
1731 htab
->elf
.dynobj
= abfd
;
1732 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1737 /* It is referenced by a non-shared object. */
1739 h
->root
.non_ir_ref
= 1;
1741 if (h
->type
== STT_GNU_IFUNC
)
1742 elf_tdata (info
->output_bfd
)->has_gnu_symbols
1743 |= elf_gnu_symbol_ifunc
;
1746 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1747 symtab_hdr
, sym_hashes
,
1748 &r_type
, GOT_UNKNOWN
,
1749 rel
, rel_end
, h
, r_symndx
))
1754 case R_X86_64_TLSLD
:
1755 htab
->tls_ld_got
.refcount
+= 1;
1758 case R_X86_64_TPOFF32
:
1759 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
1762 name
= h
->root
.root
.string
;
1764 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1766 (*_bfd_error_handler
)
1767 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1769 x86_64_elf_howto_table
[r_type
].name
, name
);
1770 bfd_set_error (bfd_error_bad_value
);
1775 case R_X86_64_GOTTPOFF
:
1776 if (!bfd_link_executable (info
))
1777 info
->flags
|= DF_STATIC_TLS
;
1780 case R_X86_64_GOT32
:
1781 case R_X86_64_GOTPCREL
:
1782 case R_X86_64_TLSGD
:
1783 case R_X86_64_GOT64
:
1784 case R_X86_64_GOTPCREL64
:
1785 case R_X86_64_GOTPLT64
:
1786 case R_X86_64_GOTPC32_TLSDESC
:
1787 case R_X86_64_TLSDESC_CALL
:
1788 /* This symbol requires a global offset table entry. */
1790 int tls_type
, old_tls_type
;
1794 default: tls_type
= GOT_NORMAL
; break;
1795 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1796 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1797 case R_X86_64_GOTPC32_TLSDESC
:
1798 case R_X86_64_TLSDESC_CALL
:
1799 tls_type
= GOT_TLS_GDESC
; break;
1804 h
->got
.refcount
+= 1;
1805 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1809 bfd_signed_vma
*local_got_refcounts
;
1811 /* This is a global offset table entry for a local symbol. */
1812 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1813 if (local_got_refcounts
== NULL
)
1817 size
= symtab_hdr
->sh_info
;
1818 size
*= sizeof (bfd_signed_vma
)
1819 + sizeof (bfd_vma
) + sizeof (char);
1820 local_got_refcounts
= ((bfd_signed_vma
*)
1821 bfd_zalloc (abfd
, size
));
1822 if (local_got_refcounts
== NULL
)
1824 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1825 elf_x86_64_local_tlsdesc_gotent (abfd
)
1826 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1827 elf_x86_64_local_got_tls_type (abfd
)
1828 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1830 local_got_refcounts
[r_symndx
] += 1;
1832 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1835 /* If a TLS symbol is accessed using IE at least once,
1836 there is no point to use dynamic model for it. */
1837 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1838 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1839 || tls_type
!= GOT_TLS_IE
))
1841 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1842 tls_type
= old_tls_type
;
1843 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1844 && GOT_TLS_GD_ANY_P (tls_type
))
1845 tls_type
|= old_tls_type
;
1849 name
= h
->root
.root
.string
;
1851 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1853 (*_bfd_error_handler
)
1854 (_("%B: '%s' accessed both as normal and thread local symbol"),
1856 bfd_set_error (bfd_error_bad_value
);
1861 if (old_tls_type
!= tls_type
)
1864 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1866 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1871 case R_X86_64_GOTOFF64
:
1872 case R_X86_64_GOTPC32
:
1873 case R_X86_64_GOTPC64
:
1875 if (htab
->elf
.sgot
== NULL
)
1877 if (htab
->elf
.dynobj
== NULL
)
1878 htab
->elf
.dynobj
= abfd
;
1879 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1885 case R_X86_64_PLT32
:
1886 case R_X86_64_PLT32_BND
:
1887 /* This symbol requires a procedure linkage table entry. We
1888 actually build the entry in adjust_dynamic_symbol,
1889 because this might be a case of linking PIC code which is
1890 never referenced by a dynamic object, in which case we
1891 don't need to generate a procedure linkage table entry
1894 /* If this is a local symbol, we resolve it directly without
1895 creating a procedure linkage table entry. */
1900 h
->plt
.refcount
+= 1;
1903 case R_X86_64_PLTOFF64
:
1904 /* This tries to form the 'address' of a function relative
1905 to GOT. For global symbols we need a PLT entry. */
1909 h
->plt
.refcount
+= 1;
1913 case R_X86_64_SIZE32
:
1914 case R_X86_64_SIZE64
:
1919 if (!ABI_64_P (abfd
))
1924 /* Let's help debug shared library creation. These relocs
1925 cannot be used in shared libs. Don't error out for
1926 sections we don't care about, such as debug sections or
1927 non-constant sections. */
1928 if (bfd_link_pic (info
)
1929 && (sec
->flags
& SEC_ALLOC
) != 0
1930 && (sec
->flags
& SEC_READONLY
) != 0)
1933 name
= h
->root
.root
.string
;
1935 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1936 (*_bfd_error_handler
)
1937 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1938 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1939 bfd_set_error (bfd_error_bad_value
);
1947 case R_X86_64_PC32_BND
:
1951 if (h
!= NULL
&& bfd_link_executable (info
))
1953 /* If this reloc is in a read-only section, we might
1954 need a copy reloc. We can't check reliably at this
1955 stage whether the section is read-only, as input
1956 sections have not yet been mapped to output sections.
1957 Tentatively set the flag for now, and correct in
1958 adjust_dynamic_symbol. */
1961 /* We may need a .plt entry if the function this reloc
1962 refers to is in a shared lib. */
1963 h
->plt
.refcount
+= 1;
1964 if (r_type
== R_X86_64_PC32
)
1966 /* Since something like ".long foo - ." may be used
1967 as pointer, make sure that PLT is used if foo is
1968 a function defined in a shared library. */
1969 if ((sec
->flags
& SEC_CODE
) == 0)
1970 h
->pointer_equality_needed
= 1;
1972 else if (r_type
!= R_X86_64_PC32_BND
1973 && r_type
!= R_X86_64_PC64
)
1975 h
->pointer_equality_needed
= 1;
1976 /* At run-time, R_X86_64_64 can be resolved for both
1977 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
1978 can only be resolved for x32. */
1979 if ((sec
->flags
& SEC_READONLY
) == 0
1980 && (r_type
== R_X86_64_64
1981 || (!ABI_64_P (abfd
)
1982 && (r_type
== R_X86_64_32
1983 || r_type
== R_X86_64_32S
))))
1985 struct elf_x86_64_link_hash_entry
*eh
1986 = (struct elf_x86_64_link_hash_entry
*) h
;
1987 eh
->func_pointer_refcount
+= 1;
1994 /* If we are creating a shared library, and this is a reloc
1995 against a global symbol, or a non PC relative reloc
1996 against a local symbol, then we need to copy the reloc
1997 into the shared library. However, if we are linking with
1998 -Bsymbolic, we do not need to copy a reloc against a
1999 global symbol which is defined in an object we are
2000 including in the link (i.e., DEF_REGULAR is set). At
2001 this point we have not seen all the input files, so it is
2002 possible that DEF_REGULAR is not set now but will be set
2003 later (it is never cleared). In case of a weak definition,
2004 DEF_REGULAR may be cleared later by a strong definition in
2005 a shared library. We account for that possibility below by
2006 storing information in the relocs_copied field of the hash
2007 table entry. A similar situation occurs when creating
2008 shared libraries and symbol visibility changes render the
2011 If on the other hand, we are creating an executable, we
2012 may need to keep relocations for symbols satisfied by a
2013 dynamic library if we manage to avoid copy relocs for the
2015 if ((bfd_link_pic (info
)
2016 && (sec
->flags
& SEC_ALLOC
) != 0
2017 && (! IS_X86_64_PCREL_TYPE (r_type
)
2019 && (! SYMBOLIC_BIND (info
, h
)
2020 || h
->root
.type
== bfd_link_hash_defweak
2021 || !h
->def_regular
))))
2022 || (ELIMINATE_COPY_RELOCS
2023 && !bfd_link_pic (info
)
2024 && (sec
->flags
& SEC_ALLOC
) != 0
2026 && (h
->root
.type
== bfd_link_hash_defweak
2027 || !h
->def_regular
)))
2029 struct elf_dyn_relocs
*p
;
2030 struct elf_dyn_relocs
**head
;
2032 /* We must copy these reloc types into the output file.
2033 Create a reloc section in dynobj and make room for
2037 if (htab
->elf
.dynobj
== NULL
)
2038 htab
->elf
.dynobj
= abfd
;
2040 sreloc
= _bfd_elf_make_dynamic_reloc_section
2041 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
2042 abfd
, /*rela?*/ TRUE
);
2048 /* If this is a global symbol, we count the number of
2049 relocations we need for this symbol. */
2052 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
2056 /* Track dynamic relocs needed for local syms too.
2057 We really need local syms available to do this
2062 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2067 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2071 /* Beware of type punned pointers vs strict aliasing
2073 vpp
= &(elf_section_data (s
)->local_dynrel
);
2074 head
= (struct elf_dyn_relocs
**)vpp
;
2078 if (p
== NULL
|| p
->sec
!= sec
)
2080 bfd_size_type amt
= sizeof *p
;
2082 p
= ((struct elf_dyn_relocs
*)
2083 bfd_alloc (htab
->elf
.dynobj
, amt
));
2094 /* Count size relocation as PC-relative relocation. */
2095 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2100 /* This relocation describes the C++ object vtable hierarchy.
2101 Reconstruct it for later use during GC. */
2102 case R_X86_64_GNU_VTINHERIT
:
2103 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2107 /* This relocation describes which C++ vtable entries are actually
2108 used. Record for later use during GC. */
2109 case R_X86_64_GNU_VTENTRY
:
2110 BFD_ASSERT (h
!= NULL
);
2112 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2122 && h
->plt
.refcount
> 0
2123 && (((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2124 || h
->got
.refcount
> 0)
2125 && htab
->plt_got
== NULL
)
2127 /* Create the GOT procedure linkage table. */
2128 unsigned int plt_got_align
;
2129 const struct elf_backend_data
*bed
;
2131 bed
= get_elf_backend_data (info
->output_bfd
);
2132 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry
) == 8
2133 && (sizeof (elf_x86_64_bnd_plt2_entry
)
2134 == sizeof (elf_x86_64_legacy_plt2_entry
)));
2137 if (htab
->elf
.dynobj
== NULL
)
2138 htab
->elf
.dynobj
= abfd
;
2140 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2142 (bed
->dynamic_sec_flags
2147 if (htab
->plt_got
== NULL
2148 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2154 if (r_type
== R_X86_64_GOTPCREL
2155 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2156 sec
->need_convert_mov_to_lea
= 1;
2162 /* Return the section that should be marked against GC for a given
2166 elf_x86_64_gc_mark_hook (asection
*sec
,
2167 struct bfd_link_info
*info
,
2168 Elf_Internal_Rela
*rel
,
2169 struct elf_link_hash_entry
*h
,
2170 Elf_Internal_Sym
*sym
)
2173 switch (ELF32_R_TYPE (rel
->r_info
))
2175 case R_X86_64_GNU_VTINHERIT
:
2176 case R_X86_64_GNU_VTENTRY
:
2180 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2183 /* Update the got entry reference counts for the section being removed. */
2186 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
2188 const Elf_Internal_Rela
*relocs
)
2190 struct elf_x86_64_link_hash_table
*htab
;
2191 Elf_Internal_Shdr
*symtab_hdr
;
2192 struct elf_link_hash_entry
**sym_hashes
;
2193 bfd_signed_vma
*local_got_refcounts
;
2194 const Elf_Internal_Rela
*rel
, *relend
;
2196 if (bfd_link_relocatable (info
))
2199 htab
= elf_x86_64_hash_table (info
);
2203 elf_section_data (sec
)->local_dynrel
= NULL
;
2205 symtab_hdr
= &elf_symtab_hdr (abfd
);
2206 sym_hashes
= elf_sym_hashes (abfd
);
2207 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2209 htab
= elf_x86_64_hash_table (info
);
2210 relend
= relocs
+ sec
->reloc_count
;
2211 for (rel
= relocs
; rel
< relend
; rel
++)
2213 unsigned long r_symndx
;
2214 unsigned int r_type
;
2215 struct elf_link_hash_entry
*h
= NULL
;
2216 bfd_boolean pointer_reloc
;
2218 r_symndx
= htab
->r_sym (rel
->r_info
);
2219 if (r_symndx
>= symtab_hdr
->sh_info
)
2221 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2222 while (h
->root
.type
== bfd_link_hash_indirect
2223 || h
->root
.type
== bfd_link_hash_warning
)
2224 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2228 /* A local symbol. */
2229 Elf_Internal_Sym
*isym
;
2231 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2234 /* Check relocation against local STT_GNU_IFUNC symbol. */
2236 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2238 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2246 struct elf_x86_64_link_hash_entry
*eh
;
2247 struct elf_dyn_relocs
**pp
;
2248 struct elf_dyn_relocs
*p
;
2250 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2252 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2255 /* Everything must go for SEC. */
2261 r_type
= ELF32_R_TYPE (rel
->r_info
);
2262 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2263 symtab_hdr
, sym_hashes
,
2264 &r_type
, GOT_UNKNOWN
,
2265 rel
, relend
, h
, r_symndx
))
2268 pointer_reloc
= FALSE
;
2271 case R_X86_64_TLSLD
:
2272 if (htab
->tls_ld_got
.refcount
> 0)
2273 htab
->tls_ld_got
.refcount
-= 1;
2276 case R_X86_64_TLSGD
:
2277 case R_X86_64_GOTPC32_TLSDESC
:
2278 case R_X86_64_TLSDESC_CALL
:
2279 case R_X86_64_GOTTPOFF
:
2280 case R_X86_64_GOT32
:
2281 case R_X86_64_GOTPCREL
:
2282 case R_X86_64_GOT64
:
2283 case R_X86_64_GOTPCREL64
:
2284 case R_X86_64_GOTPLT64
:
2287 if (h
->got
.refcount
> 0)
2288 h
->got
.refcount
-= 1;
2289 if (h
->type
== STT_GNU_IFUNC
)
2291 if (h
->plt
.refcount
> 0)
2292 h
->plt
.refcount
-= 1;
2295 else if (local_got_refcounts
!= NULL
)
2297 if (local_got_refcounts
[r_symndx
] > 0)
2298 local_got_refcounts
[r_symndx
] -= 1;
2304 pointer_reloc
= !ABI_64_P (abfd
);
2308 pointer_reloc
= TRUE
;
2314 case R_X86_64_PC32_BND
:
2316 case R_X86_64_SIZE32
:
2317 case R_X86_64_SIZE64
:
2319 if (bfd_link_pic (info
)
2320 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2324 case R_X86_64_PLT32
:
2325 case R_X86_64_PLT32_BND
:
2326 case R_X86_64_PLTOFF64
:
2329 if (h
->plt
.refcount
> 0)
2330 h
->plt
.refcount
-= 1;
2331 if (pointer_reloc
&& (sec
->flags
& SEC_READONLY
) == 0)
2333 struct elf_x86_64_link_hash_entry
*eh
2334 = (struct elf_x86_64_link_hash_entry
*) h
;
2335 if (eh
->func_pointer_refcount
> 0)
2336 eh
->func_pointer_refcount
-= 1;
2349 /* Adjust a symbol defined by a dynamic object and referenced by a
2350 regular object. The current definition is in some section of the
2351 dynamic object, but we're not including those sections. We have to
2352 change the definition to something the rest of the link can
2356 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2357 struct elf_link_hash_entry
*h
)
2359 struct elf_x86_64_link_hash_table
*htab
;
2361 struct elf_x86_64_link_hash_entry
*eh
;
2362 struct elf_dyn_relocs
*p
;
2364 /* STT_GNU_IFUNC symbol must go through PLT. */
2365 if (h
->type
== STT_GNU_IFUNC
)
2367 /* All local STT_GNU_IFUNC references must be treate as local
2368 calls via local PLT. */
2370 && SYMBOL_CALLS_LOCAL (info
, h
))
2372 bfd_size_type pc_count
= 0, count
= 0;
2373 struct elf_dyn_relocs
**pp
;
2375 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2376 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2378 pc_count
+= p
->pc_count
;
2379 p
->count
-= p
->pc_count
;
2388 if (pc_count
|| count
)
2392 if (h
->plt
.refcount
<= 0)
2393 h
->plt
.refcount
= 1;
2395 h
->plt
.refcount
+= 1;
2399 if (h
->plt
.refcount
<= 0)
2401 h
->plt
.offset
= (bfd_vma
) -1;
2407 /* If this is a function, put it in the procedure linkage table. We
2408 will fill in the contents of the procedure linkage table later,
2409 when we know the address of the .got section. */
2410 if (h
->type
== STT_FUNC
2413 if (h
->plt
.refcount
<= 0
2414 || SYMBOL_CALLS_LOCAL (info
, h
)
2415 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2416 && h
->root
.type
== bfd_link_hash_undefweak
))
2418 /* This case can occur if we saw a PLT32 reloc in an input
2419 file, but the symbol was never referred to by a dynamic
2420 object, or if all references were garbage collected. In
2421 such a case, we don't actually need to build a procedure
2422 linkage table, and we can just do a PC32 reloc instead. */
2423 h
->plt
.offset
= (bfd_vma
) -1;
2430 /* It's possible that we incorrectly decided a .plt reloc was
2431 needed for an R_X86_64_PC32 reloc to a non-function sym in
2432 check_relocs. We can't decide accurately between function and
2433 non-function syms in check-relocs; Objects loaded later in
2434 the link may change h->type. So fix it now. */
2435 h
->plt
.offset
= (bfd_vma
) -1;
2437 /* If this is a weak symbol, and there is a real definition, the
2438 processor independent code will have arranged for us to see the
2439 real definition first, and we can just use the same value. */
2440 if (h
->u
.weakdef
!= NULL
)
2442 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2443 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2444 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2445 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2446 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2448 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2449 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2450 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
2455 /* This is a reference to a symbol defined by a dynamic object which
2456 is not a function. */
2458 /* If we are creating a shared library, we must presume that the
2459 only references to the symbol are via the global offset table.
2460 For such cases we need not do anything here; the relocations will
2461 be handled correctly by relocate_section. */
2462 if (!bfd_link_executable (info
))
2465 /* If there are no references to this symbol that do not use the
2466 GOT, we don't need to generate a copy reloc. */
2467 if (!h
->non_got_ref
)
2470 /* If -z nocopyreloc was given, we won't generate them either. */
2471 if (info
->nocopyreloc
)
2477 if (ELIMINATE_COPY_RELOCS
)
2479 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2480 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2482 s
= p
->sec
->output_section
;
2483 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2487 /* If we didn't find any dynamic relocs in read-only sections, then
2488 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2496 /* We must allocate the symbol in our .dynbss section, which will
2497 become part of the .bss section of the executable. There will be
2498 an entry for this symbol in the .dynsym section. The dynamic
2499 object will contain position independent code, so all references
2500 from the dynamic object to this symbol will go through the global
2501 offset table. The dynamic linker will use the .dynsym entry to
2502 determine the address it must put in the global offset table, so
2503 both the dynamic object and the regular object will refer to the
2504 same memory location for the variable. */
2506 htab
= elf_x86_64_hash_table (info
);
2510 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2511 to copy the initial value out of the dynamic object and into the
2512 runtime process image. */
2513 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2515 const struct elf_backend_data
*bed
;
2516 bed
= get_elf_backend_data (info
->output_bfd
);
2517 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2523 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
2526 /* Allocate space in .plt, .got and associated reloc sections for
2530 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2532 struct bfd_link_info
*info
;
2533 struct elf_x86_64_link_hash_table
*htab
;
2534 struct elf_x86_64_link_hash_entry
*eh
;
2535 struct elf_dyn_relocs
*p
;
2536 const struct elf_backend_data
*bed
;
2537 unsigned int plt_entry_size
;
2539 if (h
->root
.type
== bfd_link_hash_indirect
)
2542 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2544 info
= (struct bfd_link_info
*) inf
;
2545 htab
= elf_x86_64_hash_table (info
);
2548 bed
= get_elf_backend_data (info
->output_bfd
);
2549 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2551 /* We can't use the GOT PLT if pointer equality is needed since
2552 finish_dynamic_symbol won't clear symbol value and the dynamic
2553 linker won't update the GOT slot. We will get into an infinite
2554 loop at run-time. */
2555 if (htab
->plt_got
!= NULL
2556 && h
->type
!= STT_GNU_IFUNC
2557 && !h
->pointer_equality_needed
2558 && h
->plt
.refcount
> 0
2559 && h
->got
.refcount
> 0)
2561 /* Don't use the regular PLT if there are both GOT and GOTPLT
2563 h
->plt
.offset
= (bfd_vma
) -1;
2565 /* Use the GOT PLT. */
2566 eh
->plt_got
.refcount
= 1;
2569 /* Clear the reference count of function pointer relocations if
2570 symbol isn't a normal function. */
2571 if (h
->type
!= STT_FUNC
)
2572 eh
->func_pointer_refcount
= 0;
2574 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2575 here if it is defined and referenced in a non-shared object. */
2576 if (h
->type
== STT_GNU_IFUNC
2579 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2585 asection
*s
= htab
->plt_bnd
;
2586 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
2588 /* Use the .plt.bnd section if it is created. */
2589 eh
->plt_bnd
.offset
= s
->size
;
2591 /* Make room for this entry in the .plt.bnd section. */
2592 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2600 /* Don't create the PLT entry if there are only function pointer
2601 relocations which can be resolved at run-time. */
2602 else if (htab
->elf
.dynamic_sections_created
2603 && (h
->plt
.refcount
> eh
->func_pointer_refcount
2604 || eh
->plt_got
.refcount
> 0))
2606 bfd_boolean use_plt_got
;
2608 /* Clear the reference count of function pointer relocations
2610 eh
->func_pointer_refcount
= 0;
2612 if ((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2614 /* Don't use the regular PLT for DF_BIND_NOW. */
2615 h
->plt
.offset
= (bfd_vma
) -1;
2617 /* Use the GOT PLT. */
2618 h
->got
.refcount
= 1;
2619 eh
->plt_got
.refcount
= 1;
2622 use_plt_got
= eh
->plt_got
.refcount
> 0;
2624 /* Make sure this symbol is output as a dynamic symbol.
2625 Undefined weak syms won't yet be marked as dynamic. */
2626 if (h
->dynindx
== -1
2627 && !h
->forced_local
)
2629 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2633 if (bfd_link_pic (info
)
2634 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2636 asection
*s
= htab
->elf
.splt
;
2637 asection
*bnd_s
= htab
->plt_bnd
;
2638 asection
*got_s
= htab
->plt_got
;
2640 /* If this is the first .plt entry, make room for the special
2641 first entry. The .plt section is used by prelink to undo
2642 prelinking for dynamic relocations. */
2644 s
->size
= plt_entry_size
;
2647 eh
->plt_got
.offset
= got_s
->size
;
2650 h
->plt
.offset
= s
->size
;
2652 eh
->plt_bnd
.offset
= bnd_s
->size
;
2655 /* If this symbol is not defined in a regular file, and we are
2656 not generating a shared library, then set the symbol to this
2657 location in the .plt. This is required to make function
2658 pointers compare as equal between the normal executable and
2659 the shared library. */
2660 if (! bfd_link_pic (info
)
2665 /* We need to make a call to the entry of the GOT PLT
2666 instead of regular PLT entry. */
2667 h
->root
.u
.def
.section
= got_s
;
2668 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
2674 /* We need to make a call to the entry of the second
2675 PLT instead of regular PLT entry. */
2676 h
->root
.u
.def
.section
= bnd_s
;
2677 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
2681 h
->root
.u
.def
.section
= s
;
2682 h
->root
.u
.def
.value
= h
->plt
.offset
;
2687 /* Make room for this entry. */
2689 got_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2692 s
->size
+= plt_entry_size
;
2694 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2696 /* We also need to make an entry in the .got.plt section,
2697 which will be placed in the .got section by the linker
2699 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2701 /* We also need to make an entry in the .rela.plt
2703 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2704 htab
->elf
.srelplt
->reloc_count
++;
2709 h
->plt
.offset
= (bfd_vma
) -1;
2715 h
->plt
.offset
= (bfd_vma
) -1;
2719 eh
->tlsdesc_got
= (bfd_vma
) -1;
2721 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2722 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2723 if (h
->got
.refcount
> 0
2724 && bfd_link_executable (info
)
2726 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2728 h
->got
.offset
= (bfd_vma
) -1;
2730 else if (h
->got
.refcount
> 0)
2734 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2736 /* Make sure this symbol is output as a dynamic symbol.
2737 Undefined weak syms won't yet be marked as dynamic. */
2738 if (h
->dynindx
== -1
2739 && !h
->forced_local
)
2741 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2745 if (GOT_TLS_GDESC_P (tls_type
))
2747 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2748 - elf_x86_64_compute_jump_table_size (htab
);
2749 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2750 h
->got
.offset
= (bfd_vma
) -2;
2752 if (! GOT_TLS_GDESC_P (tls_type
)
2753 || GOT_TLS_GD_P (tls_type
))
2756 h
->got
.offset
= s
->size
;
2757 s
->size
+= GOT_ENTRY_SIZE
;
2758 if (GOT_TLS_GD_P (tls_type
))
2759 s
->size
+= GOT_ENTRY_SIZE
;
2761 dyn
= htab
->elf
.dynamic_sections_created
;
2762 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2764 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2765 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2766 || tls_type
== GOT_TLS_IE
)
2767 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2768 else if (GOT_TLS_GD_P (tls_type
))
2769 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2770 else if (! GOT_TLS_GDESC_P (tls_type
)
2771 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2772 || h
->root
.type
!= bfd_link_hash_undefweak
)
2773 && (bfd_link_pic (info
)
2774 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2775 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2776 if (GOT_TLS_GDESC_P (tls_type
))
2778 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2779 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2783 h
->got
.offset
= (bfd_vma
) -1;
2785 if (eh
->dyn_relocs
== NULL
)
2788 /* In the shared -Bsymbolic case, discard space allocated for
2789 dynamic pc-relative relocs against symbols which turn out to be
2790 defined in regular objects. For the normal shared case, discard
2791 space for pc-relative relocs that have become local due to symbol
2792 visibility changes. */
2794 if (bfd_link_pic (info
))
2796 /* Relocs that use pc_count are those that appear on a call
2797 insn, or certain REL relocs that can generated via assembly.
2798 We want calls to protected symbols to resolve directly to the
2799 function rather than going via the plt. If people want
2800 function pointer comparisons to work as expected then they
2801 should avoid writing weird assembly. */
2802 if (SYMBOL_CALLS_LOCAL (info
, h
))
2804 struct elf_dyn_relocs
**pp
;
2806 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2808 p
->count
-= p
->pc_count
;
2817 /* Also discard relocs on undefined weak syms with non-default
2819 if (eh
->dyn_relocs
!= NULL
)
2821 if (h
->root
.type
== bfd_link_hash_undefweak
)
2823 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2824 eh
->dyn_relocs
= NULL
;
2826 /* Make sure undefined weak symbols are output as a dynamic
2828 else if (h
->dynindx
== -1
2829 && ! h
->forced_local
2830 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2833 /* For PIE, discard space for pc-relative relocs against
2834 symbols which turn out to need copy relocs. */
2835 else if (bfd_link_executable (info
)
2836 && (h
->needs_copy
|| eh
->needs_copy
)
2840 struct elf_dyn_relocs
**pp
;
2842 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2844 if (p
->pc_count
!= 0)
2852 else if (ELIMINATE_COPY_RELOCS
)
2854 /* For the non-shared case, discard space for relocs against
2855 symbols which turn out to need copy relocs or are not
2856 dynamic. Keep dynamic relocations for run-time function
2857 pointer initialization. */
2859 if ((!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
2862 || (htab
->elf
.dynamic_sections_created
2863 && (h
->root
.type
== bfd_link_hash_undefweak
2864 || h
->root
.type
== bfd_link_hash_undefined
))))
2866 /* Make sure this symbol is output as a dynamic symbol.
2867 Undefined weak syms won't yet be marked as dynamic. */
2868 if (h
->dynindx
== -1
2869 && ! h
->forced_local
2870 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2873 /* If that succeeded, we know we'll be keeping all the
2875 if (h
->dynindx
!= -1)
2879 eh
->dyn_relocs
= NULL
;
2880 eh
->func_pointer_refcount
= 0;
2885 /* Finally, allocate space. */
2886 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2890 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2892 BFD_ASSERT (sreloc
!= NULL
);
2894 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2900 /* Allocate space in .plt, .got and associated reloc sections for
2901 local dynamic relocs. */
2904 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2906 struct elf_link_hash_entry
*h
2907 = (struct elf_link_hash_entry
*) *slot
;
2909 if (h
->type
!= STT_GNU_IFUNC
2913 || h
->root
.type
!= bfd_link_hash_defined
)
2916 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2919 /* Find any dynamic relocs that apply to read-only sections. */
2922 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2925 struct elf_x86_64_link_hash_entry
*eh
;
2926 struct elf_dyn_relocs
*p
;
2928 /* Skip local IFUNC symbols. */
2929 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2932 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2933 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2935 asection
*s
= p
->sec
->output_section
;
2937 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2939 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2941 info
->flags
|= DF_TEXTREL
;
2943 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
2944 || info
->error_textrel
)
2945 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2946 p
->sec
->owner
, h
->root
.root
.string
,
2949 /* Not an error, just cut short the traversal. */
2957 mov foo@GOTPCREL(%rip), %reg
2960 with the local symbol, foo. */
2963 elf_x86_64_convert_mov_to_lea (bfd
*abfd
, asection
*sec
,
2964 struct bfd_link_info
*link_info
)
2966 Elf_Internal_Shdr
*symtab_hdr
;
2967 Elf_Internal_Rela
*internal_relocs
;
2968 Elf_Internal_Rela
*irel
, *irelend
;
2970 struct elf_x86_64_link_hash_table
*htab
;
2971 bfd_boolean changed_contents
;
2972 bfd_boolean changed_relocs
;
2973 bfd_signed_vma
*local_got_refcounts
;
2974 bfd_vma maxpagesize
;
2976 /* Don't even try to convert non-ELF outputs. */
2977 if (!is_elf_hash_table (link_info
->hash
))
2980 /* Nothing to do if there is no need or no output. */
2981 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
2982 || sec
->need_convert_mov_to_lea
== 0
2983 || bfd_is_abs_section (sec
->output_section
))
2986 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2988 /* Load the relocations for this section. */
2989 internal_relocs
= (_bfd_elf_link_read_relocs
2990 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
2991 link_info
->keep_memory
));
2992 if (internal_relocs
== NULL
)
2995 htab
= elf_x86_64_hash_table (link_info
);
2996 changed_contents
= FALSE
;
2997 changed_relocs
= FALSE
;
2998 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2999 maxpagesize
= get_elf_backend_data (abfd
)->maxpagesize
;
3001 /* Get the section contents. */
3002 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
3003 contents
= elf_section_data (sec
)->this_hdr
.contents
;
3006 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
3010 irelend
= internal_relocs
+ sec
->reloc_count
;
3011 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
3013 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
3014 unsigned int r_symndx
= htab
->r_sym (irel
->r_info
);
3016 struct elf_link_hash_entry
*h
;
3020 unsigned int opcode
;
3022 if (r_type
!= R_X86_64_GOTPCREL
)
3025 roff
= irel
->r_offset
;
3030 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
3032 /* PR ld/18591: Don't convert R_X86_64_GOTPCREL relocation if it
3033 isn't for mov instruction. */
3037 /* Get the symbol referred to by the reloc. */
3038 if (r_symndx
< symtab_hdr
->sh_info
)
3040 Elf_Internal_Sym
*isym
;
3042 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
3045 symtype
= ELF_ST_TYPE (isym
->st_info
);
3047 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation and
3048 skip relocation against undefined symbols. */
3049 if (symtype
== STT_GNU_IFUNC
|| isym
->st_shndx
== SHN_UNDEF
)
3052 if (isym
->st_shndx
== SHN_ABS
)
3053 tsec
= bfd_abs_section_ptr
;
3054 else if (isym
->st_shndx
== SHN_COMMON
)
3055 tsec
= bfd_com_section_ptr
;
3056 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
3057 tsec
= &_bfd_elf_large_com_section
;
3059 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3062 toff
= isym
->st_value
;
3066 indx
= r_symndx
- symtab_hdr
->sh_info
;
3067 h
= elf_sym_hashes (abfd
)[indx
];
3068 BFD_ASSERT (h
!= NULL
);
3070 while (h
->root
.type
== bfd_link_hash_indirect
3071 || h
->root
.type
== bfd_link_hash_warning
)
3072 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3074 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
3075 avoid optimizing _DYNAMIC since ld.so may use its link-time
3077 if ((h
->root
.type
== bfd_link_hash_defined
3078 || h
->root
.type
== bfd_link_hash_defweak
)
3079 && h
->type
!= STT_GNU_IFUNC
3080 && h
!= htab
->elf
.hdynamic
3081 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3083 tsec
= h
->root
.u
.def
.section
;
3084 toff
= h
->root
.u
.def
.value
;
3091 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3093 /* At this stage in linking, no SEC_MERGE symbol has been
3094 adjusted, so all references to such symbols need to be
3095 passed through _bfd_merged_section_offset. (Later, in
3096 relocate_section, all SEC_MERGE symbols *except* for
3097 section symbols have been adjusted.)
3099 gas may reduce relocations against symbols in SEC_MERGE
3100 sections to a relocation against the section symbol when
3101 the original addend was zero. When the reloc is against
3102 a section symbol we should include the addend in the
3103 offset passed to _bfd_merged_section_offset, since the
3104 location of interest is the original symbol. On the
3105 other hand, an access to "sym+addend" where "sym" is not
3106 a section symbol should not include the addend; Such an
3107 access is presumed to be an offset from "sym"; The
3108 location of interest is just "sym". */
3109 if (symtype
== STT_SECTION
)
3110 toff
+= irel
->r_addend
;
3112 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3113 elf_section_data (tsec
)->sec_info
,
3116 if (symtype
!= STT_SECTION
)
3117 toff
+= irel
->r_addend
;
3120 toff
+= irel
->r_addend
;
3122 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3123 if (tsec
->output_section
== sec
->output_section
)
3125 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3133 /* At this point, we don't know the load addresses of TSEC
3134 section nor SEC section. We estimate the distrance between
3137 for (asect
= sec
->output_section
;
3138 asect
!= NULL
&& asect
!= tsec
->output_section
;
3139 asect
= asect
->next
)
3142 for (i
= asect
->output_section
->map_head
.s
;
3146 size
= align_power (size
, i
->alignment_power
);
3151 /* Don't convert R_X86_64_GOTPCREL if TSEC isn't placed after
3156 /* Take PT_GNU_RELRO segment into account by adding
3158 if ((toff
+ size
+ maxpagesize
- roff
+ 0x80000000)
3163 bfd_put_8 (abfd
, 0x8d, contents
+ roff
- 2);
3164 irel
->r_info
= htab
->r_info (r_symndx
, R_X86_64_PC32
);
3165 changed_contents
= TRUE
;
3166 changed_relocs
= TRUE
;
3170 if (h
->got
.refcount
> 0)
3171 h
->got
.refcount
-= 1;
3175 if (local_got_refcounts
!= NULL
3176 && local_got_refcounts
[r_symndx
] > 0)
3177 local_got_refcounts
[r_symndx
] -= 1;
3181 if (contents
!= NULL
3182 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3184 if (!changed_contents
&& !link_info
->keep_memory
)
3188 /* Cache the section contents for elf_link_input_bfd. */
3189 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3193 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3195 if (!changed_relocs
)
3196 free (internal_relocs
);
3198 elf_section_data (sec
)->relocs
= internal_relocs
;
3204 if (contents
!= NULL
3205 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3207 if (internal_relocs
!= NULL
3208 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3209 free (internal_relocs
);
3213 /* Set the sizes of the dynamic sections. */
3216 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3217 struct bfd_link_info
*info
)
3219 struct elf_x86_64_link_hash_table
*htab
;
3224 const struct elf_backend_data
*bed
;
3226 htab
= elf_x86_64_hash_table (info
);
3229 bed
= get_elf_backend_data (output_bfd
);
3231 dynobj
= htab
->elf
.dynobj
;
3235 if (htab
->elf
.dynamic_sections_created
)
3237 /* Set the contents of the .interp section to the interpreter. */
3238 if (bfd_link_executable (info
) && !info
->nointerp
)
3240 s
= bfd_get_linker_section (dynobj
, ".interp");
3243 s
->size
= htab
->dynamic_interpreter_size
;
3244 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3248 /* Set up .got offsets for local syms, and space for local dynamic
3250 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3252 bfd_signed_vma
*local_got
;
3253 bfd_signed_vma
*end_local_got
;
3254 char *local_tls_type
;
3255 bfd_vma
*local_tlsdesc_gotent
;
3256 bfd_size_type locsymcount
;
3257 Elf_Internal_Shdr
*symtab_hdr
;
3260 if (! is_x86_64_elf (ibfd
))
3263 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3265 struct elf_dyn_relocs
*p
;
3267 if (!elf_x86_64_convert_mov_to_lea (ibfd
, s
, info
))
3270 for (p
= (struct elf_dyn_relocs
*)
3271 (elf_section_data (s
)->local_dynrel
);
3275 if (!bfd_is_abs_section (p
->sec
)
3276 && bfd_is_abs_section (p
->sec
->output_section
))
3278 /* Input section has been discarded, either because
3279 it is a copy of a linkonce section or due to
3280 linker script /DISCARD/, so we'll be discarding
3283 else if (p
->count
!= 0)
3285 srel
= elf_section_data (p
->sec
)->sreloc
;
3286 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3287 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3288 && (info
->flags
& DF_TEXTREL
) == 0)
3290 info
->flags
|= DF_TEXTREL
;
3291 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3292 || info
->error_textrel
)
3293 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3294 p
->sec
->owner
, p
->sec
);
3300 local_got
= elf_local_got_refcounts (ibfd
);
3304 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3305 locsymcount
= symtab_hdr
->sh_info
;
3306 end_local_got
= local_got
+ locsymcount
;
3307 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3308 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3310 srel
= htab
->elf
.srelgot
;
3311 for (; local_got
< end_local_got
;
3312 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3314 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3317 if (GOT_TLS_GDESC_P (*local_tls_type
))
3319 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3320 - elf_x86_64_compute_jump_table_size (htab
);
3321 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3322 *local_got
= (bfd_vma
) -2;
3324 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3325 || GOT_TLS_GD_P (*local_tls_type
))
3327 *local_got
= s
->size
;
3328 s
->size
+= GOT_ENTRY_SIZE
;
3329 if (GOT_TLS_GD_P (*local_tls_type
))
3330 s
->size
+= GOT_ENTRY_SIZE
;
3332 if (bfd_link_pic (info
)
3333 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3334 || *local_tls_type
== GOT_TLS_IE
)
3336 if (GOT_TLS_GDESC_P (*local_tls_type
))
3338 htab
->elf
.srelplt
->size
3339 += bed
->s
->sizeof_rela
;
3340 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3342 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3343 || GOT_TLS_GD_P (*local_tls_type
))
3344 srel
->size
+= bed
->s
->sizeof_rela
;
3348 *local_got
= (bfd_vma
) -1;
3352 if (htab
->tls_ld_got
.refcount
> 0)
3354 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3356 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3357 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3358 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3361 htab
->tls_ld_got
.offset
= -1;
3363 /* Allocate global sym .plt and .got entries, and space for global
3364 sym dynamic relocs. */
3365 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3368 /* Allocate .plt and .got entries, and space for local symbols. */
3369 htab_traverse (htab
->loc_hash_table
,
3370 elf_x86_64_allocate_local_dynrelocs
,
3373 /* For every jump slot reserved in the sgotplt, reloc_count is
3374 incremented. However, when we reserve space for TLS descriptors,
3375 it's not incremented, so in order to compute the space reserved
3376 for them, it suffices to multiply the reloc count by the jump
3379 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3380 so that R_X86_64_IRELATIVE entries come last. */
3381 if (htab
->elf
.srelplt
)
3383 htab
->sgotplt_jump_table_size
3384 = elf_x86_64_compute_jump_table_size (htab
);
3385 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3387 else if (htab
->elf
.irelplt
)
3388 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3390 if (htab
->tlsdesc_plt
)
3392 /* If we're not using lazy TLS relocations, don't generate the
3393 PLT and GOT entries they require. */
3394 if ((info
->flags
& DF_BIND_NOW
))
3395 htab
->tlsdesc_plt
= 0;
3398 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3399 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3400 /* Reserve room for the initial entry.
3401 FIXME: we could probably do away with it in this case. */
3402 if (htab
->elf
.splt
->size
== 0)
3403 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3404 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3405 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3409 if (htab
->elf
.sgotplt
)
3411 /* Don't allocate .got.plt section if there are no GOT nor PLT
3412 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3413 if ((htab
->elf
.hgot
== NULL
3414 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3415 && (htab
->elf
.sgotplt
->size
3416 == get_elf_backend_data (output_bfd
)->got_header_size
)
3417 && (htab
->elf
.splt
== NULL
3418 || htab
->elf
.splt
->size
== 0)
3419 && (htab
->elf
.sgot
== NULL
3420 || htab
->elf
.sgot
->size
== 0)
3421 && (htab
->elf
.iplt
== NULL
3422 || htab
->elf
.iplt
->size
== 0)
3423 && (htab
->elf
.igotplt
== NULL
3424 || htab
->elf
.igotplt
->size
== 0))
3425 htab
->elf
.sgotplt
->size
= 0;
3428 if (htab
->plt_eh_frame
!= NULL
3429 && htab
->elf
.splt
!= NULL
3430 && htab
->elf
.splt
->size
!= 0
3431 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3432 && _bfd_elf_eh_frame_present (info
))
3434 const struct elf_x86_64_backend_data
*arch_data
3435 = get_elf_x86_64_arch_data (bed
);
3436 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3439 /* We now have determined the sizes of the various dynamic sections.
3440 Allocate memory for them. */
3442 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3444 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3447 if (s
== htab
->elf
.splt
3448 || s
== htab
->elf
.sgot
3449 || s
== htab
->elf
.sgotplt
3450 || s
== htab
->elf
.iplt
3451 || s
== htab
->elf
.igotplt
3452 || s
== htab
->plt_bnd
3453 || s
== htab
->plt_got
3454 || s
== htab
->plt_eh_frame
3455 || s
== htab
->sdynbss
)
3457 /* Strip this section if we don't need it; see the
3460 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3462 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3465 /* We use the reloc_count field as a counter if we need
3466 to copy relocs into the output file. */
3467 if (s
!= htab
->elf
.srelplt
)
3472 /* It's not one of our sections, so don't allocate space. */
3478 /* If we don't need this section, strip it from the
3479 output file. This is mostly to handle .rela.bss and
3480 .rela.plt. We must create both sections in
3481 create_dynamic_sections, because they must be created
3482 before the linker maps input sections to output
3483 sections. The linker does that before
3484 adjust_dynamic_symbol is called, and it is that
3485 function which decides whether anything needs to go
3486 into these sections. */
3488 s
->flags
|= SEC_EXCLUDE
;
3492 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3495 /* Allocate memory for the section contents. We use bfd_zalloc
3496 here in case unused entries are not reclaimed before the
3497 section's contents are written out. This should not happen,
3498 but this way if it does, we get a R_X86_64_NONE reloc instead
3500 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3501 if (s
->contents
== NULL
)
3505 if (htab
->plt_eh_frame
!= NULL
3506 && htab
->plt_eh_frame
->contents
!= NULL
)
3508 const struct elf_x86_64_backend_data
*arch_data
3509 = get_elf_x86_64_arch_data (bed
);
3511 memcpy (htab
->plt_eh_frame
->contents
,
3512 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3513 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3514 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3517 if (htab
->elf
.dynamic_sections_created
)
3519 /* Add some entries to the .dynamic section. We fill in the
3520 values later, in elf_x86_64_finish_dynamic_sections, but we
3521 must add the entries now so that we get the correct size for
3522 the .dynamic section. The DT_DEBUG entry is filled in by the
3523 dynamic linker and used by the debugger. */
3524 #define add_dynamic_entry(TAG, VAL) \
3525 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3527 if (bfd_link_executable (info
))
3529 if (!add_dynamic_entry (DT_DEBUG
, 0))
3533 if (htab
->elf
.splt
->size
!= 0)
3535 /* DT_PLTGOT is used by prelink even if there is no PLT
3537 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3540 if (htab
->elf
.srelplt
->size
!= 0)
3542 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3543 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3544 || !add_dynamic_entry (DT_JMPREL
, 0))
3548 if (htab
->tlsdesc_plt
3549 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3550 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3556 if (!add_dynamic_entry (DT_RELA
, 0)
3557 || !add_dynamic_entry (DT_RELASZ
, 0)
3558 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3561 /* If any dynamic relocs apply to a read-only section,
3562 then we need a DT_TEXTREL entry. */
3563 if ((info
->flags
& DF_TEXTREL
) == 0)
3564 elf_link_hash_traverse (&htab
->elf
,
3565 elf_x86_64_readonly_dynrelocs
,
3568 if ((info
->flags
& DF_TEXTREL
) != 0)
3570 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3571 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3573 info
->callbacks
->einfo
3574 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3575 bfd_set_error (bfd_error_bad_value
);
3579 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3584 #undef add_dynamic_entry
3590 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3591 struct bfd_link_info
*info
)
3593 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3597 struct elf_link_hash_entry
*tlsbase
;
3599 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3600 "_TLS_MODULE_BASE_",
3601 FALSE
, FALSE
, FALSE
);
3603 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3605 struct elf_x86_64_link_hash_table
*htab
;
3606 struct bfd_link_hash_entry
*bh
= NULL
;
3607 const struct elf_backend_data
*bed
3608 = get_elf_backend_data (output_bfd
);
3610 htab
= elf_x86_64_hash_table (info
);
3614 if (!(_bfd_generic_link_add_one_symbol
3615 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3616 tls_sec
, 0, NULL
, FALSE
,
3617 bed
->collect
, &bh
)))
3620 htab
->tls_module_base
= bh
;
3622 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3623 tlsbase
->def_regular
= 1;
3624 tlsbase
->other
= STV_HIDDEN
;
3625 tlsbase
->root
.linker_def
= 1;
3626 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3633 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3634 executables. Rather than setting it to the beginning of the TLS
3635 section, we have to set it to the end. This function may be called
3636 multiple times, it is idempotent. */
3639 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3641 struct elf_x86_64_link_hash_table
*htab
;
3642 struct bfd_link_hash_entry
*base
;
3644 if (!bfd_link_executable (info
))
3647 htab
= elf_x86_64_hash_table (info
);
3651 base
= htab
->tls_module_base
;
3655 base
->u
.def
.value
= htab
->elf
.tls_size
;
3658 /* Return the base VMA address which should be subtracted from real addresses
3659 when resolving @dtpoff relocation.
3660 This is PT_TLS segment p_vaddr. */
3663 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3665 /* If tls_sec is NULL, we should have signalled an error already. */
3666 if (elf_hash_table (info
)->tls_sec
== NULL
)
3668 return elf_hash_table (info
)->tls_sec
->vma
;
3671 /* Return the relocation value for @tpoff relocation
3672 if STT_TLS virtual address is ADDRESS. */
3675 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3677 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3678 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3679 bfd_vma static_tls_size
;
3681 /* If tls_segment is NULL, we should have signalled an error already. */
3682 if (htab
->tls_sec
== NULL
)
3685 /* Consider special static TLS alignment requirements. */
3686 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3687 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3690 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3694 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3696 /* Opcode Instruction
3699 0x0f 0x8x conditional jump */
3701 && (contents
[offset
- 1] == 0xe8
3702 || contents
[offset
- 1] == 0xe9))
3704 && contents
[offset
- 2] == 0x0f
3705 && (contents
[offset
- 1] & 0xf0) == 0x80));
3708 /* Relocate an x86_64 ELF section. */
3711 elf_x86_64_relocate_section (bfd
*output_bfd
,
3712 struct bfd_link_info
*info
,
3714 asection
*input_section
,
3716 Elf_Internal_Rela
*relocs
,
3717 Elf_Internal_Sym
*local_syms
,
3718 asection
**local_sections
)
3720 struct elf_x86_64_link_hash_table
*htab
;
3721 Elf_Internal_Shdr
*symtab_hdr
;
3722 struct elf_link_hash_entry
**sym_hashes
;
3723 bfd_vma
*local_got_offsets
;
3724 bfd_vma
*local_tlsdesc_gotents
;
3725 Elf_Internal_Rela
*rel
;
3726 Elf_Internal_Rela
*relend
;
3727 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3729 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3731 htab
= elf_x86_64_hash_table (info
);
3734 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3735 sym_hashes
= elf_sym_hashes (input_bfd
);
3736 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3737 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3739 elf_x86_64_set_tls_module_base (info
);
3742 relend
= relocs
+ input_section
->reloc_count
;
3743 for (; rel
< relend
; rel
++)
3745 unsigned int r_type
;
3746 reloc_howto_type
*howto
;
3747 unsigned long r_symndx
;
3748 struct elf_link_hash_entry
*h
;
3749 struct elf_x86_64_link_hash_entry
*eh
;
3750 Elf_Internal_Sym
*sym
;
3752 bfd_vma off
, offplt
, plt_offset
;
3754 bfd_boolean unresolved_reloc
;
3755 bfd_reloc_status_type r
;
3757 asection
*base_got
, *resolved_plt
;
3760 r_type
= ELF32_R_TYPE (rel
->r_info
);
3761 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3762 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3765 if (r_type
>= (int) R_X86_64_standard
)
3767 (*_bfd_error_handler
)
3768 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3769 input_bfd
, input_section
, r_type
);
3770 bfd_set_error (bfd_error_bad_value
);
3774 if (r_type
!= (int) R_X86_64_32
3775 || ABI_64_P (output_bfd
))
3776 howto
= x86_64_elf_howto_table
+ r_type
;
3778 howto
= (x86_64_elf_howto_table
3779 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3780 r_symndx
= htab
->r_sym (rel
->r_info
);
3784 unresolved_reloc
= FALSE
;
3785 if (r_symndx
< symtab_hdr
->sh_info
)
3787 sym
= local_syms
+ r_symndx
;
3788 sec
= local_sections
[r_symndx
];
3790 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3792 st_size
= sym
->st_size
;
3794 /* Relocate against local STT_GNU_IFUNC symbol. */
3795 if (!bfd_link_relocatable (info
)
3796 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3798 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3803 /* Set STT_GNU_IFUNC symbol value. */
3804 h
->root
.u
.def
.value
= sym
->st_value
;
3805 h
->root
.u
.def
.section
= sec
;
3810 bfd_boolean warned ATTRIBUTE_UNUSED
;
3811 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3813 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3814 r_symndx
, symtab_hdr
, sym_hashes
,
3816 unresolved_reloc
, warned
, ignored
);
3820 if (sec
!= NULL
&& discarded_section (sec
))
3821 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3822 rel
, 1, relend
, howto
, 0, contents
);
3824 if (bfd_link_relocatable (info
))
3827 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
3829 if (r_type
== R_X86_64_64
)
3831 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3832 zero-extend it to 64bit if addend is zero. */
3833 r_type
= R_X86_64_32
;
3834 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3836 else if (r_type
== R_X86_64_SIZE64
)
3838 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3839 zero-extend it to 64bit if addend is zero. */
3840 r_type
= R_X86_64_SIZE32
;
3841 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3845 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3847 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3848 it here if it is defined in a non-shared object. */
3850 && h
->type
== STT_GNU_IFUNC
3856 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3858 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3859 sections because such sections are not SEC_ALLOC and
3860 thus ld.so will not process them. */
3861 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
3865 else if (h
->plt
.offset
== (bfd_vma
) -1)
3868 /* STT_GNU_IFUNC symbol must go through PLT. */
3869 if (htab
->elf
.splt
!= NULL
)
3871 if (htab
->plt_bnd
!= NULL
)
3873 resolved_plt
= htab
->plt_bnd
;
3874 plt_offset
= eh
->plt_bnd
.offset
;
3878 resolved_plt
= htab
->elf
.splt
;
3879 plt_offset
= h
->plt
.offset
;
3884 resolved_plt
= htab
->elf
.iplt
;
3885 plt_offset
= h
->plt
.offset
;
3888 relocation
= (resolved_plt
->output_section
->vma
3889 + resolved_plt
->output_offset
+ plt_offset
);
3894 if (h
->root
.root
.string
)
3895 name
= h
->root
.root
.string
;
3897 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3899 (*_bfd_error_handler
)
3900 (_("%B: relocation %s against STT_GNU_IFUNC "
3901 "symbol `%s' isn't handled by %s"), input_bfd
,
3902 x86_64_elf_howto_table
[r_type
].name
,
3903 name
, __FUNCTION__
);
3904 bfd_set_error (bfd_error_bad_value
);
3908 if (bfd_link_pic (info
))
3913 if (ABI_64_P (output_bfd
))
3917 if (rel
->r_addend
!= 0)
3919 if (h
->root
.root
.string
)
3920 name
= h
->root
.root
.string
;
3922 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3924 (*_bfd_error_handler
)
3925 (_("%B: relocation %s against STT_GNU_IFUNC "
3926 "symbol `%s' has non-zero addend: %d"),
3927 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
3928 name
, rel
->r_addend
);
3929 bfd_set_error (bfd_error_bad_value
);
3933 /* Generate dynamic relcoation only when there is a
3934 non-GOT reference in a shared object. */
3935 if (bfd_link_pic (info
) && h
->non_got_ref
)
3937 Elf_Internal_Rela outrel
;
3940 /* Need a dynamic relocation to get the real function
3942 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
3946 if (outrel
.r_offset
== (bfd_vma
) -1
3947 || outrel
.r_offset
== (bfd_vma
) -2)
3950 outrel
.r_offset
+= (input_section
->output_section
->vma
3951 + input_section
->output_offset
);
3953 if (h
->dynindx
== -1
3955 || bfd_link_executable (info
))
3957 /* This symbol is resolved locally. */
3958 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3959 outrel
.r_addend
= (h
->root
.u
.def
.value
3960 + h
->root
.u
.def
.section
->output_section
->vma
3961 + h
->root
.u
.def
.section
->output_offset
);
3965 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3966 outrel
.r_addend
= 0;
3969 sreloc
= htab
->elf
.irelifunc
;
3970 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3972 /* If this reloc is against an external symbol, we
3973 do not want to fiddle with the addend. Otherwise,
3974 we need to include the symbol value so that it
3975 becomes an addend for the dynamic reloc. For an
3976 internal symbol, we have updated addend. */
3981 case R_X86_64_PC32_BND
:
3983 case R_X86_64_PLT32
:
3984 case R_X86_64_PLT32_BND
:
3987 case R_X86_64_GOTPCREL
:
3988 case R_X86_64_GOTPCREL64
:
3989 base_got
= htab
->elf
.sgot
;
3990 off
= h
->got
.offset
;
3992 if (base_got
== NULL
)
3995 if (off
== (bfd_vma
) -1)
3997 /* We can't use h->got.offset here to save state, or
3998 even just remember the offset, as finish_dynamic_symbol
3999 would use that as offset into .got. */
4001 if (htab
->elf
.splt
!= NULL
)
4003 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4004 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4005 base_got
= htab
->elf
.sgotplt
;
4009 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4010 off
= plt_index
* GOT_ENTRY_SIZE
;
4011 base_got
= htab
->elf
.igotplt
;
4014 if (h
->dynindx
== -1
4018 /* This references the local defitionion. We must
4019 initialize this entry in the global offset table.
4020 Since the offset must always be a multiple of 8,
4021 we use the least significant bit to record
4022 whether we have initialized it already.
4024 When doing a dynamic link, we create a .rela.got
4025 relocation entry to initialize the value. This
4026 is done in the finish_dynamic_symbol routine. */
4031 bfd_put_64 (output_bfd
, relocation
,
4032 base_got
->contents
+ off
);
4033 /* Note that this is harmless for the GOTPLT64
4034 case, as -1 | 1 still is -1. */
4040 relocation
= (base_got
->output_section
->vma
4041 + base_got
->output_offset
+ off
);
4047 /* When generating a shared object, the relocations handled here are
4048 copied into the output file to be resolved at run time. */
4051 case R_X86_64_GOT32
:
4052 case R_X86_64_GOT64
:
4053 /* Relocation is to the entry for this symbol in the global
4055 case R_X86_64_GOTPCREL
:
4056 case R_X86_64_GOTPCREL64
:
4057 /* Use global offset table entry as symbol value. */
4058 case R_X86_64_GOTPLT64
:
4059 /* This is obsolete and treated the the same as GOT64. */
4060 base_got
= htab
->elf
.sgot
;
4062 if (htab
->elf
.sgot
== NULL
)
4069 off
= h
->got
.offset
;
4071 && h
->plt
.offset
!= (bfd_vma
)-1
4072 && off
== (bfd_vma
)-1)
4074 /* We can't use h->got.offset here to save
4075 state, or even just remember the offset, as
4076 finish_dynamic_symbol would use that as offset into
4078 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4079 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4080 base_got
= htab
->elf
.sgotplt
;
4083 dyn
= htab
->elf
.dynamic_sections_created
;
4085 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4086 || (bfd_link_pic (info
)
4087 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4088 || (ELF_ST_VISIBILITY (h
->other
)
4089 && h
->root
.type
== bfd_link_hash_undefweak
))
4091 /* This is actually a static link, or it is a -Bsymbolic
4092 link and the symbol is defined locally, or the symbol
4093 was forced to be local because of a version file. We
4094 must initialize this entry in the global offset table.
4095 Since the offset must always be a multiple of 8, we
4096 use the least significant bit to record whether we
4097 have initialized it already.
4099 When doing a dynamic link, we create a .rela.got
4100 relocation entry to initialize the value. This is
4101 done in the finish_dynamic_symbol routine. */
4106 bfd_put_64 (output_bfd
, relocation
,
4107 base_got
->contents
+ off
);
4108 /* Note that this is harmless for the GOTPLT64 case,
4109 as -1 | 1 still is -1. */
4114 unresolved_reloc
= FALSE
;
4118 if (local_got_offsets
== NULL
)
4121 off
= local_got_offsets
[r_symndx
];
4123 /* The offset must always be a multiple of 8. We use
4124 the least significant bit to record whether we have
4125 already generated the necessary reloc. */
4130 bfd_put_64 (output_bfd
, relocation
,
4131 base_got
->contents
+ off
);
4133 if (bfd_link_pic (info
))
4136 Elf_Internal_Rela outrel
;
4138 /* We need to generate a R_X86_64_RELATIVE reloc
4139 for the dynamic linker. */
4140 s
= htab
->elf
.srelgot
;
4144 outrel
.r_offset
= (base_got
->output_section
->vma
4145 + base_got
->output_offset
4147 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4148 outrel
.r_addend
= relocation
;
4149 elf_append_rela (output_bfd
, s
, &outrel
);
4152 local_got_offsets
[r_symndx
] |= 1;
4156 if (off
>= (bfd_vma
) -2)
4159 relocation
= base_got
->output_section
->vma
4160 + base_got
->output_offset
+ off
;
4161 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
4162 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4163 - htab
->elf
.sgotplt
->output_offset
;
4167 case R_X86_64_GOTOFF64
:
4168 /* Relocation is relative to the start of the global offset
4171 /* Check to make sure it isn't a protected function or data
4172 symbol for shared library since it may not be local when
4173 used as function address or with copy relocation. We also
4174 need to make sure that a symbol is referenced locally. */
4175 if (bfd_link_pic (info
) && h
)
4177 if (!h
->def_regular
)
4181 switch (ELF_ST_VISIBILITY (h
->other
))
4184 v
= _("hidden symbol");
4187 v
= _("internal symbol");
4190 v
= _("protected symbol");
4197 (*_bfd_error_handler
)
4198 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4199 input_bfd
, v
, h
->root
.root
.string
);
4200 bfd_set_error (bfd_error_bad_value
);
4203 else if (!bfd_link_executable (info
)
4204 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4205 && (h
->type
== STT_FUNC
4206 || h
->type
== STT_OBJECT
)
4207 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4209 (*_bfd_error_handler
)
4210 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4212 h
->type
== STT_FUNC
? "function" : "data",
4213 h
->root
.root
.string
);
4214 bfd_set_error (bfd_error_bad_value
);
4219 /* Note that sgot is not involved in this
4220 calculation. We always want the start of .got.plt. If we
4221 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4222 permitted by the ABI, we might have to change this
4224 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4225 + htab
->elf
.sgotplt
->output_offset
;
4228 case R_X86_64_GOTPC32
:
4229 case R_X86_64_GOTPC64
:
4230 /* Use global offset table as symbol value. */
4231 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4232 + htab
->elf
.sgotplt
->output_offset
;
4233 unresolved_reloc
= FALSE
;
4236 case R_X86_64_PLTOFF64
:
4237 /* Relocation is PLT entry relative to GOT. For local
4238 symbols it's the symbol itself relative to GOT. */
4240 /* See PLT32 handling. */
4241 && h
->plt
.offset
!= (bfd_vma
) -1
4242 && htab
->elf
.splt
!= NULL
)
4244 if (htab
->plt_bnd
!= NULL
)
4246 resolved_plt
= htab
->plt_bnd
;
4247 plt_offset
= eh
->plt_bnd
.offset
;
4251 resolved_plt
= htab
->elf
.splt
;
4252 plt_offset
= h
->plt
.offset
;
4255 relocation
= (resolved_plt
->output_section
->vma
4256 + resolved_plt
->output_offset
4258 unresolved_reloc
= FALSE
;
4261 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4262 + htab
->elf
.sgotplt
->output_offset
;
4265 case R_X86_64_PLT32
:
4266 case R_X86_64_PLT32_BND
:
4267 /* Relocation is to the entry for this symbol in the
4268 procedure linkage table. */
4270 /* Resolve a PLT32 reloc against a local symbol directly,
4271 without using the procedure linkage table. */
4275 if ((h
->plt
.offset
== (bfd_vma
) -1
4276 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4277 || htab
->elf
.splt
== NULL
)
4279 /* We didn't make a PLT entry for this symbol. This
4280 happens when statically linking PIC code, or when
4281 using -Bsymbolic. */
4285 if (h
->plt
.offset
!= (bfd_vma
) -1)
4287 if (htab
->plt_bnd
!= NULL
)
4289 resolved_plt
= htab
->plt_bnd
;
4290 plt_offset
= eh
->plt_bnd
.offset
;
4294 resolved_plt
= htab
->elf
.splt
;
4295 plt_offset
= h
->plt
.offset
;
4300 /* Use the GOT PLT. */
4301 resolved_plt
= htab
->plt_got
;
4302 plt_offset
= eh
->plt_got
.offset
;
4305 relocation
= (resolved_plt
->output_section
->vma
4306 + resolved_plt
->output_offset
4308 unresolved_reloc
= FALSE
;
4311 case R_X86_64_SIZE32
:
4312 case R_X86_64_SIZE64
:
4313 /* Set to symbol size. */
4314 relocation
= st_size
;
4320 case R_X86_64_PC32_BND
:
4321 /* Don't complain about -fPIC if the symbol is undefined when
4322 building executable. */
4323 if (bfd_link_pic (info
)
4324 && (input_section
->flags
& SEC_ALLOC
) != 0
4325 && (input_section
->flags
& SEC_READONLY
) != 0
4327 && !(bfd_link_executable (info
)
4328 && h
->root
.type
== bfd_link_hash_undefined
))
4330 bfd_boolean fail
= FALSE
;
4332 = ((r_type
== R_X86_64_PC32
4333 || r_type
== R_X86_64_PC32_BND
)
4334 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4336 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4338 /* Symbol is referenced locally. Make sure it is
4339 defined locally or for a branch. */
4340 fail
= !h
->def_regular
&& !branch
;
4342 else if (!(bfd_link_executable (info
)
4343 && (h
->needs_copy
|| eh
->needs_copy
)))
4345 /* Symbol doesn't need copy reloc and isn't referenced
4346 locally. We only allow branch to symbol with
4347 non-default visibility. */
4349 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4356 const char *pic
= "";
4358 switch (ELF_ST_VISIBILITY (h
->other
))
4361 v
= _("hidden symbol");
4364 v
= _("internal symbol");
4367 v
= _("protected symbol");
4371 pic
= _("; recompile with -fPIC");
4376 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4378 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4380 (*_bfd_error_handler
) (fmt
, input_bfd
,
4381 x86_64_elf_howto_table
[r_type
].name
,
4382 v
, h
->root
.root
.string
, pic
);
4383 bfd_set_error (bfd_error_bad_value
);
4394 /* FIXME: The ABI says the linker should make sure the value is
4395 the same when it's zeroextended to 64 bit. */
4398 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4401 /* Don't copy a pc-relative relocation into the output file
4402 if the symbol needs copy reloc or the symbol is undefined
4403 when building executable. Copy dynamic function pointer
4405 if ((bfd_link_pic (info
)
4406 && !(bfd_link_executable (info
)
4410 || h
->root
.type
== bfd_link_hash_undefined
)
4411 && IS_X86_64_PCREL_TYPE (r_type
))
4413 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4414 || h
->root
.type
!= bfd_link_hash_undefweak
)
4415 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4416 && r_type
!= R_X86_64_SIZE32
4417 && r_type
!= R_X86_64_SIZE64
)
4418 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4419 || (ELIMINATE_COPY_RELOCS
4420 && !bfd_link_pic (info
)
4423 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4426 || h
->root
.type
== bfd_link_hash_undefweak
4427 || h
->root
.type
== bfd_link_hash_undefined
)))
4429 Elf_Internal_Rela outrel
;
4430 bfd_boolean skip
, relocate
;
4433 /* When generating a shared object, these relocations
4434 are copied into the output file to be resolved at run
4440 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4442 if (outrel
.r_offset
== (bfd_vma
) -1)
4444 else if (outrel
.r_offset
== (bfd_vma
) -2)
4445 skip
= TRUE
, relocate
= TRUE
;
4447 outrel
.r_offset
+= (input_section
->output_section
->vma
4448 + input_section
->output_offset
);
4451 memset (&outrel
, 0, sizeof outrel
);
4453 /* h->dynindx may be -1 if this symbol was marked to
4457 && (IS_X86_64_PCREL_TYPE (r_type
)
4458 || ! bfd_link_pic (info
)
4459 || ! SYMBOLIC_BIND (info
, h
)
4460 || ! h
->def_regular
))
4462 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4463 outrel
.r_addend
= rel
->r_addend
;
4467 /* This symbol is local, or marked to become local. */
4468 if (r_type
== htab
->pointer_r_type
)
4471 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4472 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4474 else if (r_type
== R_X86_64_64
4475 && !ABI_64_P (output_bfd
))
4478 outrel
.r_info
= htab
->r_info (0,
4479 R_X86_64_RELATIVE64
);
4480 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4481 /* Check addend overflow. */
4482 if ((outrel
.r_addend
& 0x80000000)
4483 != (rel
->r_addend
& 0x80000000))
4486 int addend
= rel
->r_addend
;
4487 if (h
&& h
->root
.root
.string
)
4488 name
= h
->root
.root
.string
;
4490 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4493 (*_bfd_error_handler
)
4494 (_("%B: addend -0x%x in relocation %s against "
4495 "symbol `%s' at 0x%lx in section `%A' is "
4497 input_bfd
, input_section
, addend
,
4498 x86_64_elf_howto_table
[r_type
].name
,
4499 name
, (unsigned long) rel
->r_offset
);
4501 (*_bfd_error_handler
)
4502 (_("%B: addend 0x%x in relocation %s against "
4503 "symbol `%s' at 0x%lx in section `%A' is "
4505 input_bfd
, input_section
, addend
,
4506 x86_64_elf_howto_table
[r_type
].name
,
4507 name
, (unsigned long) rel
->r_offset
);
4508 bfd_set_error (bfd_error_bad_value
);
4516 if (bfd_is_abs_section (sec
))
4518 else if (sec
== NULL
|| sec
->owner
== NULL
)
4520 bfd_set_error (bfd_error_bad_value
);
4527 /* We are turning this relocation into one
4528 against a section symbol. It would be
4529 proper to subtract the symbol's value,
4530 osec->vma, from the emitted reloc addend,
4531 but ld.so expects buggy relocs. */
4532 osec
= sec
->output_section
;
4533 sindx
= elf_section_data (osec
)->dynindx
;
4536 asection
*oi
= htab
->elf
.text_index_section
;
4537 sindx
= elf_section_data (oi
)->dynindx
;
4539 BFD_ASSERT (sindx
!= 0);
4542 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4543 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4547 sreloc
= elf_section_data (input_section
)->sreloc
;
4549 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4551 r
= bfd_reloc_notsupported
;
4552 goto check_relocation_error
;
4555 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4557 /* If this reloc is against an external symbol, we do
4558 not want to fiddle with the addend. Otherwise, we
4559 need to include the symbol value so that it becomes
4560 an addend for the dynamic reloc. */
4567 case R_X86_64_TLSGD
:
4568 case R_X86_64_GOTPC32_TLSDESC
:
4569 case R_X86_64_TLSDESC_CALL
:
4570 case R_X86_64_GOTTPOFF
:
4571 tls_type
= GOT_UNKNOWN
;
4572 if (h
== NULL
&& local_got_offsets
)
4573 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4575 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4577 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4578 input_section
, contents
,
4579 symtab_hdr
, sym_hashes
,
4580 &r_type
, tls_type
, rel
,
4581 relend
, h
, r_symndx
))
4584 if (r_type
== R_X86_64_TPOFF32
)
4586 bfd_vma roff
= rel
->r_offset
;
4588 BFD_ASSERT (! unresolved_reloc
);
4590 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4592 /* GD->LE transition. For 64bit, change
4593 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4594 .word 0x6666; rex64; call __tls_get_addr
4597 leaq foo@tpoff(%rax), %rax
4599 leaq foo@tlsgd(%rip), %rdi
4600 .word 0x6666; rex64; call __tls_get_addr
4603 leaq foo@tpoff(%rax), %rax
4604 For largepic, change:
4605 leaq foo@tlsgd(%rip), %rdi
4606 movabsq $__tls_get_addr@pltoff, %rax
4611 leaq foo@tpoff(%rax), %rax
4612 nopw 0x0(%rax,%rax,1) */
4614 if (ABI_64_P (output_bfd
)
4615 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4617 memcpy (contents
+ roff
- 3,
4618 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4619 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4622 else if (ABI_64_P (output_bfd
))
4623 memcpy (contents
+ roff
- 4,
4624 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4627 memcpy (contents
+ roff
- 3,
4628 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4630 bfd_put_32 (output_bfd
,
4631 elf_x86_64_tpoff (info
, relocation
),
4632 contents
+ roff
+ 8 + largepic
);
4633 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4637 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4639 /* GDesc -> LE transition.
4640 It's originally something like:
4641 leaq x@tlsdesc(%rip), %rax
4644 movl $x@tpoff, %rax. */
4646 unsigned int val
, type
;
4648 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4649 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4650 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4651 contents
+ roff
- 3);
4652 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4653 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4654 contents
+ roff
- 1);
4655 bfd_put_32 (output_bfd
,
4656 elf_x86_64_tpoff (info
, relocation
),
4660 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4662 /* GDesc -> LE transition.
4667 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4668 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4671 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4673 /* IE->LE transition:
4674 For 64bit, originally it can be one of:
4675 movq foo@gottpoff(%rip), %reg
4676 addq foo@gottpoff(%rip), %reg
4679 leaq foo(%reg), %reg
4681 For 32bit, originally it can be one of:
4682 movq foo@gottpoff(%rip), %reg
4683 addl foo@gottpoff(%rip), %reg
4686 leal foo(%reg), %reg
4689 unsigned int val
, type
, reg
;
4692 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4695 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4696 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4702 bfd_put_8 (output_bfd
, 0x49,
4703 contents
+ roff
- 3);
4704 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4705 bfd_put_8 (output_bfd
, 0x41,
4706 contents
+ roff
- 3);
4707 bfd_put_8 (output_bfd
, 0xc7,
4708 contents
+ roff
- 2);
4709 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4710 contents
+ roff
- 1);
4714 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4717 bfd_put_8 (output_bfd
, 0x49,
4718 contents
+ roff
- 3);
4719 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4720 bfd_put_8 (output_bfd
, 0x41,
4721 contents
+ roff
- 3);
4722 bfd_put_8 (output_bfd
, 0x81,
4723 contents
+ roff
- 2);
4724 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4725 contents
+ roff
- 1);
4729 /* addq/addl -> leaq/leal */
4731 bfd_put_8 (output_bfd
, 0x4d,
4732 contents
+ roff
- 3);
4733 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4734 bfd_put_8 (output_bfd
, 0x45,
4735 contents
+ roff
- 3);
4736 bfd_put_8 (output_bfd
, 0x8d,
4737 contents
+ roff
- 2);
4738 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4739 contents
+ roff
- 1);
4741 bfd_put_32 (output_bfd
,
4742 elf_x86_64_tpoff (info
, relocation
),
4750 if (htab
->elf
.sgot
== NULL
)
4755 off
= h
->got
.offset
;
4756 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4760 if (local_got_offsets
== NULL
)
4763 off
= local_got_offsets
[r_symndx
];
4764 offplt
= local_tlsdesc_gotents
[r_symndx
];
4771 Elf_Internal_Rela outrel
;
4775 if (htab
->elf
.srelgot
== NULL
)
4778 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4780 if (GOT_TLS_GDESC_P (tls_type
))
4782 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4783 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4784 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4785 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4786 + htab
->elf
.sgotplt
->output_offset
4788 + htab
->sgotplt_jump_table_size
);
4789 sreloc
= htab
->elf
.srelplt
;
4791 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4793 outrel
.r_addend
= 0;
4794 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4797 sreloc
= htab
->elf
.srelgot
;
4799 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4800 + htab
->elf
.sgot
->output_offset
+ off
);
4802 if (GOT_TLS_GD_P (tls_type
))
4803 dr_type
= R_X86_64_DTPMOD64
;
4804 else if (GOT_TLS_GDESC_P (tls_type
))
4807 dr_type
= R_X86_64_TPOFF64
;
4809 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4810 outrel
.r_addend
= 0;
4811 if ((dr_type
== R_X86_64_TPOFF64
4812 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4813 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4814 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4816 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4818 if (GOT_TLS_GD_P (tls_type
))
4822 BFD_ASSERT (! unresolved_reloc
);
4823 bfd_put_64 (output_bfd
,
4824 relocation
- elf_x86_64_dtpoff_base (info
),
4825 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4829 bfd_put_64 (output_bfd
, 0,
4830 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4831 outrel
.r_info
= htab
->r_info (indx
,
4833 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4834 elf_append_rela (output_bfd
, sreloc
,
4843 local_got_offsets
[r_symndx
] |= 1;
4846 if (off
>= (bfd_vma
) -2
4847 && ! GOT_TLS_GDESC_P (tls_type
))
4849 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4851 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4852 || r_type
== R_X86_64_TLSDESC_CALL
)
4853 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4854 + htab
->elf
.sgotplt
->output_offset
4855 + offplt
+ htab
->sgotplt_jump_table_size
;
4857 relocation
= htab
->elf
.sgot
->output_section
->vma
4858 + htab
->elf
.sgot
->output_offset
+ off
;
4859 unresolved_reloc
= FALSE
;
4863 bfd_vma roff
= rel
->r_offset
;
4865 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4867 /* GD->IE transition. For 64bit, change
4868 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4869 .word 0x6666; rex64; call __tls_get_addr@plt
4872 addq foo@gottpoff(%rip), %rax
4874 leaq foo@tlsgd(%rip), %rdi
4875 .word 0x6666; rex64; call __tls_get_addr@plt
4878 addq foo@gottpoff(%rip), %rax
4879 For largepic, change:
4880 leaq foo@tlsgd(%rip), %rdi
4881 movabsq $__tls_get_addr@pltoff, %rax
4886 addq foo@gottpoff(%rax), %rax
4887 nopw 0x0(%rax,%rax,1) */
4889 if (ABI_64_P (output_bfd
)
4890 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4892 memcpy (contents
+ roff
- 3,
4893 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4894 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4897 else if (ABI_64_P (output_bfd
))
4898 memcpy (contents
+ roff
- 4,
4899 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4902 memcpy (contents
+ roff
- 3,
4903 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4906 relocation
= (htab
->elf
.sgot
->output_section
->vma
4907 + htab
->elf
.sgot
->output_offset
+ off
4910 - input_section
->output_section
->vma
4911 - input_section
->output_offset
4913 bfd_put_32 (output_bfd
, relocation
,
4914 contents
+ roff
+ 8 + largepic
);
4915 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4919 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4921 /* GDesc -> IE transition.
4922 It's originally something like:
4923 leaq x@tlsdesc(%rip), %rax
4926 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4928 /* Now modify the instruction as appropriate. To
4929 turn a leaq into a movq in the form we use it, it
4930 suffices to change the second byte from 0x8d to
4932 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4934 bfd_put_32 (output_bfd
,
4935 htab
->elf
.sgot
->output_section
->vma
4936 + htab
->elf
.sgot
->output_offset
+ off
4938 - input_section
->output_section
->vma
4939 - input_section
->output_offset
4944 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4946 /* GDesc -> IE transition.
4953 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4954 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4962 case R_X86_64_TLSLD
:
4963 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4964 input_section
, contents
,
4965 symtab_hdr
, sym_hashes
,
4966 &r_type
, GOT_UNKNOWN
,
4967 rel
, relend
, h
, r_symndx
))
4970 if (r_type
!= R_X86_64_TLSLD
)
4972 /* LD->LE transition:
4973 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4974 For 64bit, we change it into:
4975 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4976 For 32bit, we change it into:
4977 nopl 0x0(%rax); movl %fs:0, %eax.
4978 For largepic, change:
4979 leaq foo@tlsgd(%rip), %rdi
4980 movabsq $__tls_get_addr@pltoff, %rax
4984 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4987 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
4988 if (ABI_64_P (output_bfd
)
4989 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
4990 memcpy (contents
+ rel
->r_offset
- 3,
4991 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4992 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4993 else if (ABI_64_P (output_bfd
))
4994 memcpy (contents
+ rel
->r_offset
- 3,
4995 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4997 memcpy (contents
+ rel
->r_offset
- 3,
4998 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4999 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5004 if (htab
->elf
.sgot
== NULL
)
5007 off
= htab
->tls_ld_got
.offset
;
5012 Elf_Internal_Rela outrel
;
5014 if (htab
->elf
.srelgot
== NULL
)
5017 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5018 + htab
->elf
.sgot
->output_offset
+ off
);
5020 bfd_put_64 (output_bfd
, 0,
5021 htab
->elf
.sgot
->contents
+ off
);
5022 bfd_put_64 (output_bfd
, 0,
5023 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5024 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5025 outrel
.r_addend
= 0;
5026 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5028 htab
->tls_ld_got
.offset
|= 1;
5030 relocation
= htab
->elf
.sgot
->output_section
->vma
5031 + htab
->elf
.sgot
->output_offset
+ off
;
5032 unresolved_reloc
= FALSE
;
5035 case R_X86_64_DTPOFF32
:
5036 if (!bfd_link_executable (info
)
5037 || (input_section
->flags
& SEC_CODE
) == 0)
5038 relocation
-= elf_x86_64_dtpoff_base (info
);
5040 relocation
= elf_x86_64_tpoff (info
, relocation
);
5043 case R_X86_64_TPOFF32
:
5044 case R_X86_64_TPOFF64
:
5045 BFD_ASSERT (bfd_link_executable (info
));
5046 relocation
= elf_x86_64_tpoff (info
, relocation
);
5049 case R_X86_64_DTPOFF64
:
5050 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5051 relocation
-= elf_x86_64_dtpoff_base (info
);
5058 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5059 because such sections are not SEC_ALLOC and thus ld.so will
5060 not process them. */
5061 if (unresolved_reloc
5062 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5064 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5065 rel
->r_offset
) != (bfd_vma
) -1)
5067 (*_bfd_error_handler
)
5068 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5071 (long) rel
->r_offset
,
5073 h
->root
.root
.string
);
5078 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5079 contents
, rel
->r_offset
,
5080 relocation
, rel
->r_addend
);
5082 check_relocation_error
:
5083 if (r
!= bfd_reloc_ok
)
5088 name
= h
->root
.root
.string
;
5091 name
= bfd_elf_string_from_elf_section (input_bfd
,
5092 symtab_hdr
->sh_link
,
5097 name
= bfd_section_name (input_bfd
, sec
);
5100 if (r
== bfd_reloc_overflow
)
5102 if (! ((*info
->callbacks
->reloc_overflow
)
5103 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5104 (bfd_vma
) 0, input_bfd
, input_section
,
5110 (*_bfd_error_handler
)
5111 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5112 input_bfd
, input_section
,
5113 (long) rel
->r_offset
, name
, (int) r
);
5122 /* Finish up dynamic symbol handling. We set the contents of various
5123 dynamic sections here. */
5126 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5127 struct bfd_link_info
*info
,
5128 struct elf_link_hash_entry
*h
,
5129 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5131 struct elf_x86_64_link_hash_table
*htab
;
5132 const struct elf_x86_64_backend_data
*abed
;
5133 bfd_boolean use_plt_bnd
;
5134 struct elf_x86_64_link_hash_entry
*eh
;
5136 htab
= elf_x86_64_hash_table (info
);
5140 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5141 section only if there is .plt section. */
5142 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5144 ? &elf_x86_64_bnd_arch_bed
5145 : get_elf_x86_64_backend_data (output_bfd
));
5147 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5149 if (h
->plt
.offset
!= (bfd_vma
) -1)
5152 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5153 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5154 Elf_Internal_Rela rela
;
5156 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5157 const struct elf_backend_data
*bed
;
5158 bfd_vma plt_got_pcrel_offset
;
5160 /* When building a static executable, use .iplt, .igot.plt and
5161 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5162 if (htab
->elf
.splt
!= NULL
)
5164 plt
= htab
->elf
.splt
;
5165 gotplt
= htab
->elf
.sgotplt
;
5166 relplt
= htab
->elf
.srelplt
;
5170 plt
= htab
->elf
.iplt
;
5171 gotplt
= htab
->elf
.igotplt
;
5172 relplt
= htab
->elf
.irelplt
;
5175 /* This symbol has an entry in the procedure linkage table. Set
5177 if ((h
->dynindx
== -1
5178 && !((h
->forced_local
|| bfd_link_executable (info
))
5180 && h
->type
== STT_GNU_IFUNC
))
5186 /* Get the index in the procedure linkage table which
5187 corresponds to this symbol. This is the index of this symbol
5188 in all the symbols for which we are making plt entries. The
5189 first entry in the procedure linkage table is reserved.
5191 Get the offset into the .got table of the entry that
5192 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5193 bytes. The first three are reserved for the dynamic linker.
5195 For static executables, we don't reserve anything. */
5197 if (plt
== htab
->elf
.splt
)
5199 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5200 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5204 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5205 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5208 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5209 plt_plt_offset
= abed
->plt_plt_offset
;
5210 plt_got_insn_size
= abed
->plt_got_insn_size
;
5211 plt_got_offset
= abed
->plt_got_offset
;
5214 /* Use the second PLT with BND relocations. */
5215 const bfd_byte
*plt_entry
, *plt2_entry
;
5217 if (eh
->has_bnd_reloc
)
5219 plt_entry
= elf_x86_64_bnd_plt_entry
;
5220 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5224 plt_entry
= elf_x86_64_legacy_plt_entry
;
5225 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5227 /* Subtract 1 since there is no BND prefix. */
5228 plt_plt_insn_end
-= 1;
5229 plt_plt_offset
-= 1;
5230 plt_got_insn_size
-= 1;
5231 plt_got_offset
-= 1;
5234 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5235 == sizeof (elf_x86_64_legacy_plt_entry
));
5237 /* Fill in the entry in the procedure linkage table. */
5238 memcpy (plt
->contents
+ h
->plt
.offset
,
5239 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5240 /* Fill in the entry in the second PLT. */
5241 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5242 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5244 resolved_plt
= htab
->plt_bnd
;
5245 plt_offset
= eh
->plt_bnd
.offset
;
5249 /* Fill in the entry in the procedure linkage table. */
5250 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5251 abed
->plt_entry_size
);
5254 plt_offset
= h
->plt
.offset
;
5257 /* Insert the relocation positions of the plt section. */
5259 /* Put offset the PC-relative instruction referring to the GOT entry,
5260 subtracting the size of that instruction. */
5261 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5262 + gotplt
->output_offset
5264 - resolved_plt
->output_section
->vma
5265 - resolved_plt
->output_offset
5267 - plt_got_insn_size
);
5269 /* Check PC-relative offset overflow in PLT entry. */
5270 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5271 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5272 output_bfd
, h
->root
.root
.string
);
5274 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5275 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5277 /* Fill in the entry in the global offset table, initially this
5278 points to the second part of the PLT entry. */
5279 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5280 + plt
->output_offset
5281 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5282 gotplt
->contents
+ got_offset
);
5284 /* Fill in the entry in the .rela.plt section. */
5285 rela
.r_offset
= (gotplt
->output_section
->vma
5286 + gotplt
->output_offset
5288 if (h
->dynindx
== -1
5289 || ((bfd_link_executable (info
)
5290 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5292 && h
->type
== STT_GNU_IFUNC
))
5294 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5295 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5296 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5297 rela
.r_addend
= (h
->root
.u
.def
.value
5298 + h
->root
.u
.def
.section
->output_section
->vma
5299 + h
->root
.u
.def
.section
->output_offset
);
5300 /* R_X86_64_IRELATIVE comes last. */
5301 plt_index
= htab
->next_irelative_index
--;
5305 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5307 plt_index
= htab
->next_jump_slot_index
++;
5310 /* Don't fill PLT entry for static executables. */
5311 if (plt
== htab
->elf
.splt
)
5313 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5315 /* Put relocation index. */
5316 bfd_put_32 (output_bfd
, plt_index
,
5317 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5319 /* Put offset for jmp .PLT0 and check for overflow. We don't
5320 check relocation index for overflow since branch displacement
5321 will overflow first. */
5322 if (plt0_offset
> 0x80000000)
5323 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5324 output_bfd
, h
->root
.root
.string
);
5325 bfd_put_32 (output_bfd
, - plt0_offset
,
5326 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5329 bed
= get_elf_backend_data (output_bfd
);
5330 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5331 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5333 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5335 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5336 asection
*plt
, *got
;
5337 bfd_boolean got_after_plt
;
5338 int32_t got_pcrel_offset
;
5339 const bfd_byte
*got_plt_entry
;
5341 /* Set the entry in the GOT procedure linkage table. */
5342 plt
= htab
->plt_got
;
5343 got
= htab
->elf
.sgot
;
5344 got_offset
= h
->got
.offset
;
5346 if (got_offset
== (bfd_vma
) -1
5347 || h
->type
== STT_GNU_IFUNC
5352 /* Use the second PLT entry template for the GOT PLT since they
5353 are the identical. */
5354 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5355 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5356 if (eh
->has_bnd_reloc
)
5357 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5360 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5362 /* Subtract 1 since there is no BND prefix. */
5363 plt_got_insn_size
-= 1;
5364 plt_got_offset
-= 1;
5367 /* Fill in the entry in the GOT procedure linkage table. */
5368 plt_offset
= eh
->plt_got
.offset
;
5369 memcpy (plt
->contents
+ plt_offset
,
5370 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5372 /* Put offset the PC-relative instruction referring to the GOT
5373 entry, subtracting the size of that instruction. */
5374 got_pcrel_offset
= (got
->output_section
->vma
5375 + got
->output_offset
5377 - plt
->output_section
->vma
5378 - plt
->output_offset
5380 - plt_got_insn_size
);
5382 /* Check PC-relative offset overflow in GOT PLT entry. */
5383 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5384 if ((got_after_plt
&& got_pcrel_offset
< 0)
5385 || (!got_after_plt
&& got_pcrel_offset
> 0))
5386 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5387 output_bfd
, h
->root
.root
.string
);
5389 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5390 plt
->contents
+ plt_offset
+ plt_got_offset
);
5394 && (h
->plt
.offset
!= (bfd_vma
) -1
5395 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5397 /* Mark the symbol as undefined, rather than as defined in
5398 the .plt section. Leave the value if there were any
5399 relocations where pointer equality matters (this is a clue
5400 for the dynamic linker, to make function pointer
5401 comparisons work between an application and shared
5402 library), otherwise set it to zero. If a function is only
5403 called from a binary, there is no need to slow down
5404 shared libraries because of that. */
5405 sym
->st_shndx
= SHN_UNDEF
;
5406 if (!h
->pointer_equality_needed
)
5410 if (h
->got
.offset
!= (bfd_vma
) -1
5411 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5412 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5414 Elf_Internal_Rela rela
;
5416 /* This symbol has an entry in the global offset table. Set it
5418 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5421 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5422 + htab
->elf
.sgot
->output_offset
5423 + (h
->got
.offset
&~ (bfd_vma
) 1));
5425 /* If this is a static link, or it is a -Bsymbolic link and the
5426 symbol is defined locally or was forced to be local because
5427 of a version file, we just want to emit a RELATIVE reloc.
5428 The entry in the global offset table will already have been
5429 initialized in the relocate_section function. */
5431 && h
->type
== STT_GNU_IFUNC
)
5433 if (bfd_link_pic (info
))
5435 /* Generate R_X86_64_GLOB_DAT. */
5442 if (!h
->pointer_equality_needed
)
5445 /* For non-shared object, we can't use .got.plt, which
5446 contains the real function addres if we need pointer
5447 equality. We load the GOT entry with the PLT entry. */
5448 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5449 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5450 + plt
->output_offset
5452 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5456 else if (bfd_link_pic (info
)
5457 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5459 if (!h
->def_regular
)
5461 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5462 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5463 rela
.r_addend
= (h
->root
.u
.def
.value
5464 + h
->root
.u
.def
.section
->output_section
->vma
5465 + h
->root
.u
.def
.section
->output_offset
);
5469 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5471 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5472 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5473 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5477 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5482 Elf_Internal_Rela rela
;
5484 /* This symbol needs a copy reloc. Set it up. */
5486 if (h
->dynindx
== -1
5487 || (h
->root
.type
!= bfd_link_hash_defined
5488 && h
->root
.type
!= bfd_link_hash_defweak
)
5489 || htab
->srelbss
== NULL
)
5492 rela
.r_offset
= (h
->root
.u
.def
.value
5493 + h
->root
.u
.def
.section
->output_section
->vma
5494 + h
->root
.u
.def
.section
->output_offset
);
5495 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5497 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5503 /* Finish up local dynamic symbol handling. We set the contents of
5504 various dynamic sections here. */
5507 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5509 struct elf_link_hash_entry
*h
5510 = (struct elf_link_hash_entry
*) *slot
;
5511 struct bfd_link_info
*info
5512 = (struct bfd_link_info
*) inf
;
5514 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5518 /* Used to decide how to sort relocs in an optimal manner for the
5519 dynamic linker, before writing them out. */
5521 static enum elf_reloc_type_class
5522 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
5523 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5524 const Elf_Internal_Rela
*rela
)
5526 bfd
*abfd
= info
->output_bfd
;
5527 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5528 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
5529 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
5530 Elf_Internal_Sym sym
;
5532 if (htab
->elf
.dynsym
== NULL
5533 || !bed
->s
->swap_symbol_in (abfd
,
5534 (htab
->elf
.dynsym
->contents
5535 + r_symndx
* bed
->s
->sizeof_sym
),
5539 /* Check relocation against STT_GNU_IFUNC symbol. */
5540 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5541 return reloc_class_ifunc
;
5543 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5545 case R_X86_64_RELATIVE
:
5546 case R_X86_64_RELATIVE64
:
5547 return reloc_class_relative
;
5548 case R_X86_64_JUMP_SLOT
:
5549 return reloc_class_plt
;
5551 return reloc_class_copy
;
5553 return reloc_class_normal
;
5557 /* Finish up the dynamic sections. */
5560 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5561 struct bfd_link_info
*info
)
5563 struct elf_x86_64_link_hash_table
*htab
;
5566 const struct elf_x86_64_backend_data
*abed
;
5568 htab
= elf_x86_64_hash_table (info
);
5572 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5573 section only if there is .plt section. */
5574 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5575 ? &elf_x86_64_bnd_arch_bed
5576 : get_elf_x86_64_backend_data (output_bfd
));
5578 dynobj
= htab
->elf
.dynobj
;
5579 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5581 if (htab
->elf
.dynamic_sections_created
)
5583 bfd_byte
*dyncon
, *dynconend
;
5584 const struct elf_backend_data
*bed
;
5585 bfd_size_type sizeof_dyn
;
5587 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5590 bed
= get_elf_backend_data (dynobj
);
5591 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5592 dyncon
= sdyn
->contents
;
5593 dynconend
= sdyn
->contents
+ sdyn
->size
;
5594 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5596 Elf_Internal_Dyn dyn
;
5599 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5607 s
= htab
->elf
.sgotplt
;
5608 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5612 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5616 s
= htab
->elf
.srelplt
->output_section
;
5617 dyn
.d_un
.d_val
= s
->size
;
5621 /* The procedure linkage table relocs (DT_JMPREL) should
5622 not be included in the overall relocs (DT_RELA).
5623 Therefore, we override the DT_RELASZ entry here to
5624 make it not include the JMPREL relocs. Since the
5625 linker script arranges for .rela.plt to follow all
5626 other relocation sections, we don't have to worry
5627 about changing the DT_RELA entry. */
5628 if (htab
->elf
.srelplt
!= NULL
)
5630 s
= htab
->elf
.srelplt
->output_section
;
5631 dyn
.d_un
.d_val
-= s
->size
;
5635 case DT_TLSDESC_PLT
:
5637 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5638 + htab
->tlsdesc_plt
;
5641 case DT_TLSDESC_GOT
:
5643 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5644 + htab
->tlsdesc_got
;
5648 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5651 /* Fill in the special first entry in the procedure linkage table. */
5652 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5654 /* Fill in the first entry in the procedure linkage table. */
5655 memcpy (htab
->elf
.splt
->contents
,
5656 abed
->plt0_entry
, abed
->plt_entry_size
);
5657 /* Add offset for pushq GOT+8(%rip), since the instruction
5658 uses 6 bytes subtract this value. */
5659 bfd_put_32 (output_bfd
,
5660 (htab
->elf
.sgotplt
->output_section
->vma
5661 + htab
->elf
.sgotplt
->output_offset
5663 - htab
->elf
.splt
->output_section
->vma
5664 - htab
->elf
.splt
->output_offset
5666 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5667 /* Add offset for the PC-relative instruction accessing GOT+16,
5668 subtracting the offset to the end of that instruction. */
5669 bfd_put_32 (output_bfd
,
5670 (htab
->elf
.sgotplt
->output_section
->vma
5671 + htab
->elf
.sgotplt
->output_offset
5673 - htab
->elf
.splt
->output_section
->vma
5674 - htab
->elf
.splt
->output_offset
5675 - abed
->plt0_got2_insn_end
),
5676 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5678 elf_section_data (htab
->elf
.splt
->output_section
)
5679 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5681 if (htab
->tlsdesc_plt
)
5683 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5684 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5686 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5687 abed
->plt0_entry
, abed
->plt_entry_size
);
5689 /* Add offset for pushq GOT+8(%rip), since the
5690 instruction uses 6 bytes subtract this value. */
5691 bfd_put_32 (output_bfd
,
5692 (htab
->elf
.sgotplt
->output_section
->vma
5693 + htab
->elf
.sgotplt
->output_offset
5695 - htab
->elf
.splt
->output_section
->vma
5696 - htab
->elf
.splt
->output_offset
5699 htab
->elf
.splt
->contents
5700 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5701 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5702 where TGD stands for htab->tlsdesc_got, subtracting the offset
5703 to the end of that instruction. */
5704 bfd_put_32 (output_bfd
,
5705 (htab
->elf
.sgot
->output_section
->vma
5706 + htab
->elf
.sgot
->output_offset
5708 - htab
->elf
.splt
->output_section
->vma
5709 - htab
->elf
.splt
->output_offset
5711 - abed
->plt0_got2_insn_end
),
5712 htab
->elf
.splt
->contents
5713 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5718 if (htab
->plt_bnd
!= NULL
)
5719 elf_section_data (htab
->plt_bnd
->output_section
)
5720 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5722 if (htab
->elf
.sgotplt
)
5724 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5726 (*_bfd_error_handler
)
5727 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5731 /* Fill in the first three entries in the global offset table. */
5732 if (htab
->elf
.sgotplt
->size
> 0)
5734 /* Set the first entry in the global offset table to the address of
5735 the dynamic section. */
5737 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5739 bfd_put_64 (output_bfd
,
5740 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5741 htab
->elf
.sgotplt
->contents
);
5742 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5743 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5744 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5747 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5751 /* Adjust .eh_frame for .plt section. */
5752 if (htab
->plt_eh_frame
!= NULL
5753 && htab
->plt_eh_frame
->contents
!= NULL
)
5755 if (htab
->elf
.splt
!= NULL
5756 && htab
->elf
.splt
->size
!= 0
5757 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5758 && htab
->elf
.splt
->output_section
!= NULL
5759 && htab
->plt_eh_frame
->output_section
!= NULL
)
5761 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5762 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5763 + htab
->plt_eh_frame
->output_offset
5764 + PLT_FDE_START_OFFSET
;
5765 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5766 htab
->plt_eh_frame
->contents
5767 + PLT_FDE_START_OFFSET
);
5769 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5771 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5773 htab
->plt_eh_frame
->contents
))
5778 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5779 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5782 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5783 htab_traverse (htab
->loc_hash_table
,
5784 elf_x86_64_finish_local_dynamic_symbol
,
5790 /* Return an array of PLT entry symbol values. */
5793 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
5796 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5799 bfd_vma
*plt_sym_val
;
5801 bfd_byte
*plt_contents
;
5802 const struct elf_x86_64_backend_data
*bed
;
5803 Elf_Internal_Shdr
*hdr
;
5806 /* Get the .plt section contents. PLT passed down may point to the
5807 .plt.bnd section. Make sure that PLT always points to the .plt
5809 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5814 plt
= bfd_get_section_by_name (abfd
, ".plt");
5817 bed
= &elf_x86_64_bnd_arch_bed
;
5820 bed
= get_elf_x86_64_backend_data (abfd
);
5822 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
5823 if (plt_contents
== NULL
)
5825 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5826 plt_contents
, 0, plt
->size
))
5829 free (plt_contents
);
5833 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
5834 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
5837 hdr
= &elf_section_data (relplt
)->this_hdr
;
5838 count
= relplt
->size
/ hdr
->sh_entsize
;
5840 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
5841 if (plt_sym_val
== NULL
)
5844 for (i
= 0; i
< count
; i
++)
5845 plt_sym_val
[i
] = -1;
5847 plt_offset
= bed
->plt_entry_size
;
5848 p
= relplt
->relocation
;
5849 for (i
= 0; i
< count
; i
++, p
++)
5853 /* Skip unknown relocation. */
5854 if (p
->howto
== NULL
)
5857 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
5858 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
5861 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
5862 + bed
->plt_reloc_offset
));
5863 if (reloc_index
>= count
)
5867 /* This is the index in .plt section. */
5868 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
5869 /* Store VMA + the offset in .plt.bnd section. */
5870 plt_sym_val
[reloc_index
] =
5872 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
5875 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
5876 plt_offset
+= bed
->plt_entry_size
;
5878 /* PR binutils/18437: Skip extra relocations in the .rela.plt
5880 if (plt_offset
>= plt
->size
)
5884 free (plt_contents
);
5889 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5893 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
5900 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5901 as PLT if it exists. */
5902 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5904 plt
= bfd_get_section_by_name (abfd
, ".plt");
5905 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
5906 dynsymcount
, dynsyms
, ret
,
5908 elf_x86_64_get_plt_sym_val
);
5911 /* Handle an x86-64 specific section when reading an object file. This
5912 is called when elfcode.h finds a section with an unknown type. */
5915 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
5916 const char *name
, int shindex
)
5918 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
5921 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
5927 /* Hook called by the linker routine which adds symbols from an object
5928 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5932 elf_x86_64_add_symbol_hook (bfd
*abfd
,
5933 struct bfd_link_info
*info
,
5934 Elf_Internal_Sym
*sym
,
5935 const char **namep ATTRIBUTE_UNUSED
,
5936 flagword
*flagsp ATTRIBUTE_UNUSED
,
5942 switch (sym
->st_shndx
)
5944 case SHN_X86_64_LCOMMON
:
5945 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
5948 lcomm
= bfd_make_section_with_flags (abfd
,
5952 | SEC_LINKER_CREATED
));
5955 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
5958 *valp
= sym
->st_size
;
5962 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
5963 && (abfd
->flags
& DYNAMIC
) == 0
5964 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
5965 elf_tdata (info
->output_bfd
)->has_gnu_symbols
5966 |= elf_gnu_symbol_unique
;
5972 /* Given a BFD section, try to locate the corresponding ELF section
5976 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
5977 asection
*sec
, int *index_return
)
5979 if (sec
== &_bfd_elf_large_com_section
)
5981 *index_return
= SHN_X86_64_LCOMMON
;
5987 /* Process a symbol. */
5990 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
5993 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
5995 switch (elfsym
->internal_elf_sym
.st_shndx
)
5997 case SHN_X86_64_LCOMMON
:
5998 asym
->section
= &_bfd_elf_large_com_section
;
5999 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6000 /* Common symbol doesn't set BSF_GLOBAL. */
6001 asym
->flags
&= ~BSF_GLOBAL
;
6007 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6009 return (sym
->st_shndx
== SHN_COMMON
6010 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6014 elf_x86_64_common_section_index (asection
*sec
)
6016 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6019 return SHN_X86_64_LCOMMON
;
6023 elf_x86_64_common_section (asection
*sec
)
6025 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6026 return bfd_com_section_ptr
;
6028 return &_bfd_elf_large_com_section
;
6032 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6033 const Elf_Internal_Sym
*sym
,
6038 const asection
*oldsec
)
6040 /* A normal common symbol and a large common symbol result in a
6041 normal common symbol. We turn the large common symbol into a
6044 && h
->root
.type
== bfd_link_hash_common
6046 && bfd_is_com_section (*psec
)
6049 if (sym
->st_shndx
== SHN_COMMON
6050 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6052 h
->root
.u
.c
.p
->section
6053 = bfd_make_section_old_way (oldbfd
, "COMMON");
6054 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6056 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6057 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6058 *psec
= bfd_com_section_ptr
;
6065 elf_x86_64_additional_program_headers (bfd
*abfd
,
6066 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6071 /* Check to see if we need a large readonly segment. */
6072 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6073 if (s
&& (s
->flags
& SEC_LOAD
))
6076 /* Check to see if we need a large data segment. Since .lbss sections
6077 is placed right after the .bss section, there should be no need for
6078 a large data segment just because of .lbss. */
6079 s
= bfd_get_section_by_name (abfd
, ".ldata");
6080 if (s
&& (s
->flags
& SEC_LOAD
))
6086 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6089 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6091 if (h
->plt
.offset
!= (bfd_vma
) -1
6093 && !h
->pointer_equality_needed
)
6096 return _bfd_elf_hash_symbol (h
);
6099 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6102 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6103 const bfd_target
*output
)
6105 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6106 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6107 && _bfd_elf_relocs_compatible (input
, output
));
6110 static const struct bfd_elf_special_section
6111 elf_x86_64_special_sections
[]=
6113 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6114 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6115 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6116 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6117 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6118 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6119 { NULL
, 0, 0, 0, 0 }
6122 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6123 #define TARGET_LITTLE_NAME "elf64-x86-64"
6124 #define ELF_ARCH bfd_arch_i386
6125 #define ELF_TARGET_ID X86_64_ELF_DATA
6126 #define ELF_MACHINE_CODE EM_X86_64
6127 #define ELF_MAXPAGESIZE 0x200000
6128 #define ELF_MINPAGESIZE 0x1000
6129 #define ELF_COMMONPAGESIZE 0x1000
6131 #define elf_backend_can_gc_sections 1
6132 #define elf_backend_can_refcount 1
6133 #define elf_backend_want_got_plt 1
6134 #define elf_backend_plt_readonly 1
6135 #define elf_backend_want_plt_sym 0
6136 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6137 #define elf_backend_rela_normal 1
6138 #define elf_backend_plt_alignment 4
6139 #define elf_backend_extern_protected_data 1
6141 #define elf_info_to_howto elf_x86_64_info_to_howto
6143 #define bfd_elf64_bfd_link_hash_table_create \
6144 elf_x86_64_link_hash_table_create
6145 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6146 #define bfd_elf64_bfd_reloc_name_lookup \
6147 elf_x86_64_reloc_name_lookup
6149 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6150 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6151 #define elf_backend_check_relocs elf_x86_64_check_relocs
6152 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6153 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6154 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6155 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6156 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6157 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6158 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6159 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6161 #define elf_backend_write_core_note elf_x86_64_write_core_note
6163 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6164 #define elf_backend_relocate_section elf_x86_64_relocate_section
6165 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6166 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6167 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6168 #define elf_backend_object_p elf64_x86_64_elf_object_p
6169 #define bfd_elf64_mkobject elf_x86_64_mkobject
6170 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6172 #define elf_backend_section_from_shdr \
6173 elf_x86_64_section_from_shdr
6175 #define elf_backend_section_from_bfd_section \
6176 elf_x86_64_elf_section_from_bfd_section
6177 #define elf_backend_add_symbol_hook \
6178 elf_x86_64_add_symbol_hook
6179 #define elf_backend_symbol_processing \
6180 elf_x86_64_symbol_processing
6181 #define elf_backend_common_section_index \
6182 elf_x86_64_common_section_index
6183 #define elf_backend_common_section \
6184 elf_x86_64_common_section
6185 #define elf_backend_common_definition \
6186 elf_x86_64_common_definition
6187 #define elf_backend_merge_symbol \
6188 elf_x86_64_merge_symbol
6189 #define elf_backend_special_sections \
6190 elf_x86_64_special_sections
6191 #define elf_backend_additional_program_headers \
6192 elf_x86_64_additional_program_headers
6193 #define elf_backend_hash_symbol \
6194 elf_x86_64_hash_symbol
6196 #include "elf64-target.h"
6198 /* CloudABI support. */
6200 #undef TARGET_LITTLE_SYM
6201 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6202 #undef TARGET_LITTLE_NAME
6203 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6206 #define ELF_OSABI ELFOSABI_CLOUDABI
6209 #define elf64_bed elf64_x86_64_cloudabi_bed
6211 #include "elf64-target.h"
6213 /* FreeBSD support. */
6215 #undef TARGET_LITTLE_SYM
6216 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6217 #undef TARGET_LITTLE_NAME
6218 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6221 #define ELF_OSABI ELFOSABI_FREEBSD
6224 #define elf64_bed elf64_x86_64_fbsd_bed
6226 #include "elf64-target.h"
6228 /* Solaris 2 support. */
6230 #undef TARGET_LITTLE_SYM
6231 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6232 #undef TARGET_LITTLE_NAME
6233 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6235 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6236 objects won't be recognized. */
6240 #define elf64_bed elf64_x86_64_sol2_bed
6242 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6244 #undef elf_backend_static_tls_alignment
6245 #define elf_backend_static_tls_alignment 16
6247 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6249 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6251 #undef elf_backend_want_plt_sym
6252 #define elf_backend_want_plt_sym 1
6254 #include "elf64-target.h"
6256 /* Native Client support. */
6259 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6261 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6262 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6266 #undef TARGET_LITTLE_SYM
6267 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6268 #undef TARGET_LITTLE_NAME
6269 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6271 #define elf64_bed elf64_x86_64_nacl_bed
6273 #undef ELF_MAXPAGESIZE
6274 #undef ELF_MINPAGESIZE
6275 #undef ELF_COMMONPAGESIZE
6276 #define ELF_MAXPAGESIZE 0x10000
6277 #define ELF_MINPAGESIZE 0x10000
6278 #define ELF_COMMONPAGESIZE 0x10000
6280 /* Restore defaults. */
6282 #undef elf_backend_static_tls_alignment
6283 #undef elf_backend_want_plt_sym
6284 #define elf_backend_want_plt_sym 0
6286 /* NaCl uses substantially different PLT entries for the same effects. */
6288 #undef elf_backend_plt_alignment
6289 #define elf_backend_plt_alignment 5
6290 #define NACL_PLT_ENTRY_SIZE 64
6291 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6293 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6295 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6296 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6297 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6298 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6299 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6301 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6302 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6304 /* 32 bytes of nop to pad out to the standard size. */
6305 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6306 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6307 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6308 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6309 0x66, /* excess data32 prefix */
6313 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6315 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6316 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6317 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6318 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6320 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6321 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6322 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6324 /* Lazy GOT entries point here (32-byte aligned). */
6325 0x68, /* pushq immediate */
6326 0, 0, 0, 0, /* replaced with index into relocation table. */
6327 0xe9, /* jmp relative */
6328 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6330 /* 22 bytes of nop to pad out to the standard size. */
6331 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6332 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6333 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6336 /* .eh_frame covering the .plt section. */
6338 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6340 #if (PLT_CIE_LENGTH != 20 \
6341 || PLT_FDE_LENGTH != 36 \
6342 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6343 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6344 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6346 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6347 0, 0, 0, 0, /* CIE ID */
6348 1, /* CIE version */
6349 'z', 'R', 0, /* Augmentation string */
6350 1, /* Code alignment factor */
6351 0x78, /* Data alignment factor */
6352 16, /* Return address column */
6353 1, /* Augmentation size */
6354 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6355 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6356 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6357 DW_CFA_nop
, DW_CFA_nop
,
6359 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6360 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6361 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6362 0, 0, 0, 0, /* .plt size goes here */
6363 0, /* Augmentation size */
6364 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6365 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6366 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6367 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6368 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6369 13, /* Block length */
6370 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6371 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6372 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6373 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6374 DW_CFA_nop
, DW_CFA_nop
6377 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6379 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6380 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6381 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6382 2, /* plt0_got1_offset */
6383 9, /* plt0_got2_offset */
6384 13, /* plt0_got2_insn_end */
6385 3, /* plt_got_offset */
6386 33, /* plt_reloc_offset */
6387 38, /* plt_plt_offset */
6388 7, /* plt_got_insn_size */
6389 42, /* plt_plt_insn_end */
6390 32, /* plt_lazy_offset */
6391 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6392 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6395 #undef elf_backend_arch_data
6396 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6398 #undef elf_backend_object_p
6399 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6400 #undef elf_backend_modify_segment_map
6401 #define elf_backend_modify_segment_map nacl_modify_segment_map
6402 #undef elf_backend_modify_program_headers
6403 #define elf_backend_modify_program_headers nacl_modify_program_headers
6404 #undef elf_backend_final_write_processing
6405 #define elf_backend_final_write_processing nacl_final_write_processing
6407 #include "elf64-target.h"
6409 /* Native Client x32 support. */
6412 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6414 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6415 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6419 #undef TARGET_LITTLE_SYM
6420 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6421 #undef TARGET_LITTLE_NAME
6422 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6424 #define elf32_bed elf32_x86_64_nacl_bed
6426 #define bfd_elf32_bfd_link_hash_table_create \
6427 elf_x86_64_link_hash_table_create
6428 #define bfd_elf32_bfd_reloc_type_lookup \
6429 elf_x86_64_reloc_type_lookup
6430 #define bfd_elf32_bfd_reloc_name_lookup \
6431 elf_x86_64_reloc_name_lookup
6432 #define bfd_elf32_mkobject \
6434 #define bfd_elf32_get_synthetic_symtab \
6435 elf_x86_64_get_synthetic_symtab
6437 #undef elf_backend_object_p
6438 #define elf_backend_object_p \
6439 elf32_x86_64_nacl_elf_object_p
6441 #undef elf_backend_bfd_from_remote_memory
6442 #define elf_backend_bfd_from_remote_memory \
6443 _bfd_elf32_bfd_from_remote_memory
6445 #undef elf_backend_size_info
6446 #define elf_backend_size_info \
6447 _bfd_elf32_size_info
6449 #include "elf32-target.h"
6451 /* Restore defaults. */
6452 #undef elf_backend_object_p
6453 #define elf_backend_object_p elf64_x86_64_elf_object_p
6454 #undef elf_backend_bfd_from_remote_memory
6455 #undef elf_backend_size_info
6456 #undef elf_backend_modify_segment_map
6457 #undef elf_backend_modify_program_headers
6458 #undef elf_backend_final_write_processing
6460 /* Intel L1OM support. */
6463 elf64_l1om_elf_object_p (bfd
*abfd
)
6465 /* Set the right machine number for an L1OM elf64 file. */
6466 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6470 #undef TARGET_LITTLE_SYM
6471 #define TARGET_LITTLE_SYM l1om_elf64_vec
6472 #undef TARGET_LITTLE_NAME
6473 #define TARGET_LITTLE_NAME "elf64-l1om"
6475 #define ELF_ARCH bfd_arch_l1om
6477 #undef ELF_MACHINE_CODE
6478 #define ELF_MACHINE_CODE EM_L1OM
6483 #define elf64_bed elf64_l1om_bed
6485 #undef elf_backend_object_p
6486 #define elf_backend_object_p elf64_l1om_elf_object_p
6488 /* Restore defaults. */
6489 #undef ELF_MAXPAGESIZE
6490 #undef ELF_MINPAGESIZE
6491 #undef ELF_COMMONPAGESIZE
6492 #define ELF_MAXPAGESIZE 0x200000
6493 #define ELF_MINPAGESIZE 0x1000
6494 #define ELF_COMMONPAGESIZE 0x1000
6495 #undef elf_backend_plt_alignment
6496 #define elf_backend_plt_alignment 4
6497 #undef elf_backend_arch_data
6498 #define elf_backend_arch_data &elf_x86_64_arch_bed
6500 #include "elf64-target.h"
6502 /* FreeBSD L1OM support. */
6504 #undef TARGET_LITTLE_SYM
6505 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6506 #undef TARGET_LITTLE_NAME
6507 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6510 #define ELF_OSABI ELFOSABI_FREEBSD
6513 #define elf64_bed elf64_l1om_fbsd_bed
6515 #include "elf64-target.h"
6517 /* Intel K1OM support. */
6520 elf64_k1om_elf_object_p (bfd
*abfd
)
6522 /* Set the right machine number for an K1OM elf64 file. */
6523 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6527 #undef TARGET_LITTLE_SYM
6528 #define TARGET_LITTLE_SYM k1om_elf64_vec
6529 #undef TARGET_LITTLE_NAME
6530 #define TARGET_LITTLE_NAME "elf64-k1om"
6532 #define ELF_ARCH bfd_arch_k1om
6534 #undef ELF_MACHINE_CODE
6535 #define ELF_MACHINE_CODE EM_K1OM
6540 #define elf64_bed elf64_k1om_bed
6542 #undef elf_backend_object_p
6543 #define elf_backend_object_p elf64_k1om_elf_object_p
6545 #undef elf_backend_static_tls_alignment
6547 #undef elf_backend_want_plt_sym
6548 #define elf_backend_want_plt_sym 0
6550 #include "elf64-target.h"
6552 /* FreeBSD K1OM support. */
6554 #undef TARGET_LITTLE_SYM
6555 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6556 #undef TARGET_LITTLE_NAME
6557 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6560 #define ELF_OSABI ELFOSABI_FREEBSD
6563 #define elf64_bed elf64_k1om_fbsd_bed
6565 #include "elf64-target.h"
6567 /* 32bit x86-64 support. */
6569 #undef TARGET_LITTLE_SYM
6570 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6571 #undef TARGET_LITTLE_NAME
6572 #define TARGET_LITTLE_NAME "elf32-x86-64"
6576 #define ELF_ARCH bfd_arch_i386
6578 #undef ELF_MACHINE_CODE
6579 #define ELF_MACHINE_CODE EM_X86_64
6583 #undef elf_backend_object_p
6584 #define elf_backend_object_p \
6585 elf32_x86_64_elf_object_p
6587 #undef elf_backend_bfd_from_remote_memory
6588 #define elf_backend_bfd_from_remote_memory \
6589 _bfd_elf32_bfd_from_remote_memory
6591 #undef elf_backend_size_info
6592 #define elf_backend_size_info \
6593 _bfd_elf32_size_info
6595 #include "elf32-target.h"