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 /* Information about the GOT PLT entry. Filled when there are both
771 GOT and PLT relocations against the same function. */
772 union gotplt_union plt_got
;
774 /* Information about the second PLT entry. Filled when has_bnd_reloc is
776 union gotplt_union plt_bnd
;
778 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
779 starting at the end of the jump table. */
783 #define elf_x86_64_hash_entry(ent) \
784 ((struct elf_x86_64_link_hash_entry *)(ent))
786 struct elf_x86_64_obj_tdata
788 struct elf_obj_tdata root
;
790 /* tls_type for each local got entry. */
791 char *local_got_tls_type
;
793 /* GOTPLT entries for TLS descriptors. */
794 bfd_vma
*local_tlsdesc_gotent
;
797 #define elf_x86_64_tdata(abfd) \
798 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
800 #define elf_x86_64_local_got_tls_type(abfd) \
801 (elf_x86_64_tdata (abfd)->local_got_tls_type)
803 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
804 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
806 #define is_x86_64_elf(bfd) \
807 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
808 && elf_tdata (bfd) != NULL \
809 && elf_object_id (bfd) == X86_64_ELF_DATA)
812 elf_x86_64_mkobject (bfd
*abfd
)
814 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
818 /* x86-64 ELF linker hash table. */
820 struct elf_x86_64_link_hash_table
822 struct elf_link_hash_table elf
;
824 /* Short-cuts to get to dynamic linker sections. */
827 asection
*plt_eh_frame
;
833 bfd_signed_vma refcount
;
837 /* The amount of space used by the jump slots in the GOT. */
838 bfd_vma sgotplt_jump_table_size
;
840 /* Small local sym cache. */
841 struct sym_cache sym_cache
;
843 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
844 bfd_vma (*r_sym
) (bfd_vma
);
845 unsigned int pointer_r_type
;
846 const char *dynamic_interpreter
;
847 int dynamic_interpreter_size
;
849 /* _TLS_MODULE_BASE_ symbol. */
850 struct bfd_link_hash_entry
*tls_module_base
;
852 /* Used by local STT_GNU_IFUNC symbols. */
853 htab_t loc_hash_table
;
854 void * loc_hash_memory
;
856 /* The offset into splt of the PLT entry for the TLS descriptor
857 resolver. Special values are 0, if not necessary (or not found
858 to be necessary yet), and -1 if needed but not determined
861 /* The offset into sgot of the GOT entry used by the PLT entry
865 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
866 bfd_vma next_jump_slot_index
;
867 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
868 bfd_vma next_irelative_index
;
871 /* Get the x86-64 ELF linker hash table from a link_info structure. */
873 #define elf_x86_64_hash_table(p) \
874 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
875 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
877 #define elf_x86_64_compute_jump_table_size(htab) \
878 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
880 /* Create an entry in an x86-64 ELF linker hash table. */
882 static struct bfd_hash_entry
*
883 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
884 struct bfd_hash_table
*table
,
887 /* Allocate the structure if it has not already been allocated by a
891 entry
= (struct bfd_hash_entry
*)
892 bfd_hash_allocate (table
,
893 sizeof (struct elf_x86_64_link_hash_entry
));
898 /* Call the allocation method of the superclass. */
899 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
902 struct elf_x86_64_link_hash_entry
*eh
;
904 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
905 eh
->dyn_relocs
= NULL
;
906 eh
->tls_type
= GOT_UNKNOWN
;
908 eh
->has_bnd_reloc
= 0;
909 eh
->plt_bnd
.offset
= (bfd_vma
) -1;
910 eh
->plt_got
.offset
= (bfd_vma
) -1;
911 eh
->tlsdesc_got
= (bfd_vma
) -1;
917 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
918 for local symbol so that we can handle local STT_GNU_IFUNC symbols
919 as global symbol. We reuse indx and dynstr_index for local symbol
920 hash since they aren't used by global symbols in this backend. */
923 elf_x86_64_local_htab_hash (const void *ptr
)
925 struct elf_link_hash_entry
*h
926 = (struct elf_link_hash_entry
*) ptr
;
927 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
930 /* Compare local hash entries. */
933 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
935 struct elf_link_hash_entry
*h1
936 = (struct elf_link_hash_entry
*) ptr1
;
937 struct elf_link_hash_entry
*h2
938 = (struct elf_link_hash_entry
*) ptr2
;
940 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
943 /* Find and/or create a hash entry for local symbol. */
945 static struct elf_link_hash_entry
*
946 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
947 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
950 struct elf_x86_64_link_hash_entry e
, *ret
;
951 asection
*sec
= abfd
->sections
;
952 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
953 htab
->r_sym (rel
->r_info
));
956 e
.elf
.indx
= sec
->id
;
957 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
958 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
959 create
? INSERT
: NO_INSERT
);
966 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
970 ret
= (struct elf_x86_64_link_hash_entry
*)
971 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
972 sizeof (struct elf_x86_64_link_hash_entry
));
975 memset (ret
, 0, sizeof (*ret
));
976 ret
->elf
.indx
= sec
->id
;
977 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
978 ret
->elf
.dynindx
= -1;
979 ret
->plt_got
.offset
= (bfd_vma
) -1;
985 /* Destroy an X86-64 ELF linker hash table. */
988 elf_x86_64_link_hash_table_free (bfd
*obfd
)
990 struct elf_x86_64_link_hash_table
*htab
991 = (struct elf_x86_64_link_hash_table
*) obfd
->link
.hash
;
993 if (htab
->loc_hash_table
)
994 htab_delete (htab
->loc_hash_table
);
995 if (htab
->loc_hash_memory
)
996 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
997 _bfd_elf_link_hash_table_free (obfd
);
1000 /* Create an X86-64 ELF linker hash table. */
1002 static struct bfd_link_hash_table
*
1003 elf_x86_64_link_hash_table_create (bfd
*abfd
)
1005 struct elf_x86_64_link_hash_table
*ret
;
1006 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
1008 ret
= (struct elf_x86_64_link_hash_table
*) bfd_zmalloc (amt
);
1012 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1013 elf_x86_64_link_hash_newfunc
,
1014 sizeof (struct elf_x86_64_link_hash_entry
),
1021 if (ABI_64_P (abfd
))
1023 ret
->r_info
= elf64_r_info
;
1024 ret
->r_sym
= elf64_r_sym
;
1025 ret
->pointer_r_type
= R_X86_64_64
;
1026 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
1027 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
1031 ret
->r_info
= elf32_r_info
;
1032 ret
->r_sym
= elf32_r_sym
;
1033 ret
->pointer_r_type
= R_X86_64_32
;
1034 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
1035 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
1038 ret
->loc_hash_table
= htab_try_create (1024,
1039 elf_x86_64_local_htab_hash
,
1040 elf_x86_64_local_htab_eq
,
1042 ret
->loc_hash_memory
= objalloc_create ();
1043 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1045 elf_x86_64_link_hash_table_free (abfd
);
1048 ret
->elf
.root
.hash_table_free
= elf_x86_64_link_hash_table_free
;
1050 return &ret
->elf
.root
;
1053 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1054 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1058 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
1059 struct bfd_link_info
*info
)
1061 struct elf_x86_64_link_hash_table
*htab
;
1063 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1066 htab
= elf_x86_64_hash_table (info
);
1070 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
1074 if (info
->executable
)
1076 /* Always allow copy relocs for building executables. */
1077 asection
*s
= bfd_get_linker_section (dynobj
, ".rela.bss");
1080 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
1081 s
= bfd_make_section_anyway_with_flags (dynobj
,
1083 (bed
->dynamic_sec_flags
1086 || ! bfd_set_section_alignment (dynobj
, s
,
1087 bed
->s
->log_file_align
))
1093 if (!info
->no_ld_generated_unwind_info
1094 && htab
->plt_eh_frame
== NULL
1095 && htab
->elf
.splt
!= NULL
)
1097 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1098 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1099 | SEC_LINKER_CREATED
);
1101 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1102 if (htab
->plt_eh_frame
== NULL
1103 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
1109 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1112 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1113 struct elf_link_hash_entry
*dir
,
1114 struct elf_link_hash_entry
*ind
)
1116 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1118 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1119 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1121 if (!edir
->has_bnd_reloc
)
1122 edir
->has_bnd_reloc
= eind
->has_bnd_reloc
;
1124 if (eind
->dyn_relocs
!= NULL
)
1126 if (edir
->dyn_relocs
!= NULL
)
1128 struct elf_dyn_relocs
**pp
;
1129 struct elf_dyn_relocs
*p
;
1131 /* Add reloc counts against the indirect sym to the direct sym
1132 list. Merge any entries against the same section. */
1133 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1135 struct elf_dyn_relocs
*q
;
1137 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1138 if (q
->sec
== p
->sec
)
1140 q
->pc_count
+= p
->pc_count
;
1141 q
->count
+= p
->count
;
1148 *pp
= edir
->dyn_relocs
;
1151 edir
->dyn_relocs
= eind
->dyn_relocs
;
1152 eind
->dyn_relocs
= NULL
;
1155 if (ind
->root
.type
== bfd_link_hash_indirect
1156 && dir
->got
.refcount
<= 0)
1158 edir
->tls_type
= eind
->tls_type
;
1159 eind
->tls_type
= GOT_UNKNOWN
;
1162 if (ELIMINATE_COPY_RELOCS
1163 && ind
->root
.type
!= bfd_link_hash_indirect
1164 && dir
->dynamic_adjusted
)
1166 /* If called to transfer flags for a weakdef during processing
1167 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1168 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1169 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1170 dir
->ref_regular
|= ind
->ref_regular
;
1171 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1172 dir
->needs_plt
|= ind
->needs_plt
;
1173 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1176 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1180 elf64_x86_64_elf_object_p (bfd
*abfd
)
1182 /* Set the right machine number for an x86-64 elf64 file. */
1183 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1188 elf32_x86_64_elf_object_p (bfd
*abfd
)
1190 /* Set the right machine number for an x86-64 elf32 file. */
1191 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1195 /* Return TRUE if the TLS access code sequence support transition
1199 elf_x86_64_check_tls_transition (bfd
*abfd
,
1200 struct bfd_link_info
*info
,
1203 Elf_Internal_Shdr
*symtab_hdr
,
1204 struct elf_link_hash_entry
**sym_hashes
,
1205 unsigned int r_type
,
1206 const Elf_Internal_Rela
*rel
,
1207 const Elf_Internal_Rela
*relend
)
1210 unsigned long r_symndx
;
1211 bfd_boolean largepic
= FALSE
;
1212 struct elf_link_hash_entry
*h
;
1214 struct elf_x86_64_link_hash_table
*htab
;
1216 /* Get the section contents. */
1217 if (contents
== NULL
)
1219 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1220 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1223 /* FIXME: How to better handle error condition? */
1224 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1227 /* Cache the section contents for elf_link_input_bfd. */
1228 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1232 htab
= elf_x86_64_hash_table (info
);
1233 offset
= rel
->r_offset
;
1236 case R_X86_64_TLSGD
:
1237 case R_X86_64_TLSLD
:
1238 if ((rel
+ 1) >= relend
)
1241 if (r_type
== R_X86_64_TLSGD
)
1243 /* Check transition from GD access model. For 64bit, only
1244 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1245 .word 0x6666; rex64; call __tls_get_addr
1246 can transit to different access model. For 32bit, only
1247 leaq foo@tlsgd(%rip), %rdi
1248 .word 0x6666; rex64; call __tls_get_addr
1249 can transit to different access model. For largepic
1251 leaq foo@tlsgd(%rip), %rdi
1252 movabsq $__tls_get_addr@pltoff, %rax
1256 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1257 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1259 if ((offset
+ 12) > sec
->size
)
1262 if (memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1264 if (!ABI_64_P (abfd
)
1265 || (offset
+ 19) > sec
->size
1267 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0
1268 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1269 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1274 else if (ABI_64_P (abfd
))
1277 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1283 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1289 /* Check transition from LD access model. Only
1290 leaq foo@tlsld(%rip), %rdi;
1292 can transit to different access model. For largepic
1294 leaq foo@tlsld(%rip), %rdi
1295 movabsq $__tls_get_addr@pltoff, %rax
1299 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1301 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1304 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1307 if (0xe8 != *(contents
+ offset
+ 4))
1309 if (!ABI_64_P (abfd
)
1310 || (offset
+ 19) > sec
->size
1311 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1312 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1319 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1320 if (r_symndx
< symtab_hdr
->sh_info
)
1323 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1324 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1325 may be versioned. */
1327 && h
->root
.root
.string
!= NULL
1329 ? ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
1330 : (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1331 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
))
1332 && (strncmp (h
->root
.root
.string
,
1333 "__tls_get_addr", 14) == 0));
1335 case R_X86_64_GOTTPOFF
:
1336 /* Check transition from IE access model:
1337 mov foo@gottpoff(%rip), %reg
1338 add foo@gottpoff(%rip), %reg
1341 /* Check REX prefix first. */
1342 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1344 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1345 if (val
!= 0x48 && val
!= 0x4c)
1347 /* X32 may have 0x44 REX prefix or no REX prefix. */
1348 if (ABI_64_P (abfd
))
1354 /* X32 may not have any REX prefix. */
1355 if (ABI_64_P (abfd
))
1357 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1361 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1362 if (val
!= 0x8b && val
!= 0x03)
1365 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1366 return (val
& 0xc7) == 5;
1368 case R_X86_64_GOTPC32_TLSDESC
:
1369 /* Check transition from GDesc access model:
1370 leaq x@tlsdesc(%rip), %rax
1372 Make sure it's a leaq adding rip to a 32-bit offset
1373 into any register, although it's probably almost always
1376 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1379 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1380 if ((val
& 0xfb) != 0x48)
1383 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1386 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1387 return (val
& 0xc7) == 0x05;
1389 case R_X86_64_TLSDESC_CALL
:
1390 /* Check transition from GDesc access model:
1391 call *x@tlsdesc(%rax)
1393 if (offset
+ 2 <= sec
->size
)
1395 /* Make sure that it's a call *x@tlsdesc(%rax). */
1396 static const unsigned char call
[] = { 0xff, 0x10 };
1397 return memcmp (contents
+ offset
, call
, 2) == 0;
1407 /* Return TRUE if the TLS access transition is OK or no transition
1408 will be performed. Update R_TYPE if there is a transition. */
1411 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1412 asection
*sec
, bfd_byte
*contents
,
1413 Elf_Internal_Shdr
*symtab_hdr
,
1414 struct elf_link_hash_entry
**sym_hashes
,
1415 unsigned int *r_type
, int tls_type
,
1416 const Elf_Internal_Rela
*rel
,
1417 const Elf_Internal_Rela
*relend
,
1418 struct elf_link_hash_entry
*h
,
1419 unsigned long r_symndx
)
1421 unsigned int from_type
= *r_type
;
1422 unsigned int to_type
= from_type
;
1423 bfd_boolean check
= TRUE
;
1425 /* Skip TLS transition for functions. */
1427 && (h
->type
== STT_FUNC
1428 || h
->type
== STT_GNU_IFUNC
))
1433 case R_X86_64_TLSGD
:
1434 case R_X86_64_GOTPC32_TLSDESC
:
1435 case R_X86_64_TLSDESC_CALL
:
1436 case R_X86_64_GOTTPOFF
:
1437 if (info
->executable
)
1440 to_type
= R_X86_64_TPOFF32
;
1442 to_type
= R_X86_64_GOTTPOFF
;
1445 /* When we are called from elf_x86_64_relocate_section,
1446 CONTENTS isn't NULL and there may be additional transitions
1447 based on TLS_TYPE. */
1448 if (contents
!= NULL
)
1450 unsigned int new_to_type
= to_type
;
1452 if (info
->executable
1455 && tls_type
== GOT_TLS_IE
)
1456 new_to_type
= R_X86_64_TPOFF32
;
1458 if (to_type
== R_X86_64_TLSGD
1459 || to_type
== R_X86_64_GOTPC32_TLSDESC
1460 || to_type
== R_X86_64_TLSDESC_CALL
)
1462 if (tls_type
== GOT_TLS_IE
)
1463 new_to_type
= R_X86_64_GOTTPOFF
;
1466 /* We checked the transition before when we were called from
1467 elf_x86_64_check_relocs. We only want to check the new
1468 transition which hasn't been checked before. */
1469 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1470 to_type
= new_to_type
;
1475 case R_X86_64_TLSLD
:
1476 if (info
->executable
)
1477 to_type
= R_X86_64_TPOFF32
;
1484 /* Return TRUE if there is no transition. */
1485 if (from_type
== to_type
)
1488 /* Check if the transition can be performed. */
1490 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1491 symtab_hdr
, sym_hashes
,
1492 from_type
, rel
, relend
))
1494 reloc_howto_type
*from
, *to
;
1497 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1498 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1501 name
= h
->root
.root
.string
;
1504 struct elf_x86_64_link_hash_table
*htab
;
1506 htab
= elf_x86_64_hash_table (info
);
1511 Elf_Internal_Sym
*isym
;
1513 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1515 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1519 (*_bfd_error_handler
)
1520 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1521 "in section `%A' failed"),
1522 abfd
, sec
, from
->name
, to
->name
, name
,
1523 (unsigned long) rel
->r_offset
);
1524 bfd_set_error (bfd_error_bad_value
);
1532 /* Rename some of the generic section flags to better document how they
1534 #define need_convert_mov_to_lea sec_flg0
1536 /* Look through the relocs for a section during the first phase, and
1537 calculate needed space in the global offset table, procedure
1538 linkage table, and dynamic reloc sections. */
1541 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1543 const Elf_Internal_Rela
*relocs
)
1545 struct elf_x86_64_link_hash_table
*htab
;
1546 Elf_Internal_Shdr
*symtab_hdr
;
1547 struct elf_link_hash_entry
**sym_hashes
;
1548 const Elf_Internal_Rela
*rel
;
1549 const Elf_Internal_Rela
*rel_end
;
1551 bfd_boolean use_plt_got
;
1553 if (info
->relocatable
)
1556 BFD_ASSERT (is_x86_64_elf (abfd
));
1558 htab
= elf_x86_64_hash_table (info
);
1562 use_plt_got
= get_elf_x86_64_backend_data (abfd
) == &elf_x86_64_arch_bed
;
1564 symtab_hdr
= &elf_symtab_hdr (abfd
);
1565 sym_hashes
= elf_sym_hashes (abfd
);
1569 rel_end
= relocs
+ sec
->reloc_count
;
1570 for (rel
= relocs
; rel
< rel_end
; rel
++)
1572 unsigned int r_type
;
1573 unsigned long r_symndx
;
1574 struct elf_link_hash_entry
*h
;
1575 Elf_Internal_Sym
*isym
;
1577 bfd_boolean size_reloc
;
1579 r_symndx
= htab
->r_sym (rel
->r_info
);
1580 r_type
= ELF32_R_TYPE (rel
->r_info
);
1582 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1584 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1589 if (r_symndx
< symtab_hdr
->sh_info
)
1591 /* A local symbol. */
1592 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1597 /* Check relocation against local STT_GNU_IFUNC symbol. */
1598 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1600 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1605 /* Fake a STT_GNU_IFUNC symbol. */
1606 h
->type
= STT_GNU_IFUNC
;
1609 h
->forced_local
= 1;
1610 h
->root
.type
= bfd_link_hash_defined
;
1618 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1619 while (h
->root
.type
== bfd_link_hash_indirect
1620 || h
->root
.type
== bfd_link_hash_warning
)
1621 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1624 /* Check invalid x32 relocations. */
1625 if (!ABI_64_P (abfd
))
1631 case R_X86_64_DTPOFF64
:
1632 case R_X86_64_TPOFF64
:
1634 case R_X86_64_GOTOFF64
:
1635 case R_X86_64_GOT64
:
1636 case R_X86_64_GOTPCREL64
:
1637 case R_X86_64_GOTPC64
:
1638 case R_X86_64_GOTPLT64
:
1639 case R_X86_64_PLTOFF64
:
1642 name
= h
->root
.root
.string
;
1644 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1646 (*_bfd_error_handler
)
1647 (_("%B: relocation %s against symbol `%s' isn't "
1648 "supported in x32 mode"), abfd
,
1649 x86_64_elf_howto_table
[r_type
].name
, name
);
1650 bfd_set_error (bfd_error_bad_value
);
1658 /* Create the ifunc sections for static executables. If we
1659 never see an indirect function symbol nor we are building
1660 a static executable, those sections will be empty and
1661 won't appear in output. */
1667 case R_X86_64_PC32_BND
:
1668 case R_X86_64_PLT32_BND
:
1670 case R_X86_64_PLT32
:
1673 /* MPX PLT is supported only if elf_x86_64_arch_bed
1674 is used in 64-bit mode. */
1677 && (get_elf_x86_64_backend_data (abfd
)
1678 == &elf_x86_64_arch_bed
))
1680 elf_x86_64_hash_entry (h
)->has_bnd_reloc
= 1;
1682 /* Create the second PLT for Intel MPX support. */
1683 if (htab
->plt_bnd
== NULL
)
1685 unsigned int plt_bnd_align
;
1686 const struct elf_backend_data
*bed
;
1688 bed
= get_elf_backend_data (info
->output_bfd
);
1689 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
) == 8
1690 && (sizeof (elf_x86_64_bnd_plt2_entry
)
1691 == sizeof (elf_x86_64_legacy_plt2_entry
)));
1694 if (htab
->elf
.dynobj
== NULL
)
1695 htab
->elf
.dynobj
= abfd
;
1697 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1699 (bed
->dynamic_sec_flags
1704 if (htab
->plt_bnd
== NULL
1705 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
1714 case R_X86_64_GOTPCREL
:
1715 case R_X86_64_GOTPCREL64
:
1716 if (htab
->elf
.dynobj
== NULL
)
1717 htab
->elf
.dynobj
= abfd
;
1718 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1723 /* It is referenced by a non-shared object. */
1725 h
->root
.non_ir_ref
= 1;
1727 if (h
->type
== STT_GNU_IFUNC
)
1728 elf_tdata (info
->output_bfd
)->has_gnu_symbols
1729 |= elf_gnu_symbol_ifunc
;
1732 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1733 symtab_hdr
, sym_hashes
,
1734 &r_type
, GOT_UNKNOWN
,
1735 rel
, rel_end
, h
, r_symndx
))
1740 case R_X86_64_TLSLD
:
1741 htab
->tls_ld_got
.refcount
+= 1;
1744 case R_X86_64_TPOFF32
:
1745 if (!info
->executable
&& ABI_64_P (abfd
))
1748 name
= h
->root
.root
.string
;
1750 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1752 (*_bfd_error_handler
)
1753 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1755 x86_64_elf_howto_table
[r_type
].name
, name
);
1756 bfd_set_error (bfd_error_bad_value
);
1761 case R_X86_64_GOTTPOFF
:
1762 if (!info
->executable
)
1763 info
->flags
|= DF_STATIC_TLS
;
1766 case R_X86_64_GOT32
:
1767 case R_X86_64_GOTPCREL
:
1768 case R_X86_64_TLSGD
:
1769 case R_X86_64_GOT64
:
1770 case R_X86_64_GOTPCREL64
:
1771 case R_X86_64_GOTPLT64
:
1772 case R_X86_64_GOTPC32_TLSDESC
:
1773 case R_X86_64_TLSDESC_CALL
:
1774 /* This symbol requires a global offset table entry. */
1776 int tls_type
, old_tls_type
;
1780 default: tls_type
= GOT_NORMAL
; break;
1781 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1782 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1783 case R_X86_64_GOTPC32_TLSDESC
:
1784 case R_X86_64_TLSDESC_CALL
:
1785 tls_type
= GOT_TLS_GDESC
; break;
1790 h
->got
.refcount
+= 1;
1791 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1795 bfd_signed_vma
*local_got_refcounts
;
1797 /* This is a global offset table entry for a local symbol. */
1798 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1799 if (local_got_refcounts
== NULL
)
1803 size
= symtab_hdr
->sh_info
;
1804 size
*= sizeof (bfd_signed_vma
)
1805 + sizeof (bfd_vma
) + sizeof (char);
1806 local_got_refcounts
= ((bfd_signed_vma
*)
1807 bfd_zalloc (abfd
, size
));
1808 if (local_got_refcounts
== NULL
)
1810 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1811 elf_x86_64_local_tlsdesc_gotent (abfd
)
1812 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1813 elf_x86_64_local_got_tls_type (abfd
)
1814 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1816 local_got_refcounts
[r_symndx
] += 1;
1818 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1821 /* If a TLS symbol is accessed using IE at least once,
1822 there is no point to use dynamic model for it. */
1823 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1824 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1825 || tls_type
!= GOT_TLS_IE
))
1827 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1828 tls_type
= old_tls_type
;
1829 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1830 && GOT_TLS_GD_ANY_P (tls_type
))
1831 tls_type
|= old_tls_type
;
1835 name
= h
->root
.root
.string
;
1837 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1839 (*_bfd_error_handler
)
1840 (_("%B: '%s' accessed both as normal and thread local symbol"),
1842 bfd_set_error (bfd_error_bad_value
);
1847 if (old_tls_type
!= tls_type
)
1850 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1852 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1857 case R_X86_64_GOTOFF64
:
1858 case R_X86_64_GOTPC32
:
1859 case R_X86_64_GOTPC64
:
1861 if (htab
->elf
.sgot
== NULL
)
1863 if (htab
->elf
.dynobj
== NULL
)
1864 htab
->elf
.dynobj
= abfd
;
1865 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1871 case R_X86_64_PLT32
:
1872 case R_X86_64_PLT32_BND
:
1873 /* This symbol requires a procedure linkage table entry. We
1874 actually build the entry in adjust_dynamic_symbol,
1875 because this might be a case of linking PIC code which is
1876 never referenced by a dynamic object, in which case we
1877 don't need to generate a procedure linkage table entry
1880 /* If this is a local symbol, we resolve it directly without
1881 creating a procedure linkage table entry. */
1886 h
->plt
.refcount
+= 1;
1889 case R_X86_64_PLTOFF64
:
1890 /* This tries to form the 'address' of a function relative
1891 to GOT. For global symbols we need a PLT entry. */
1895 h
->plt
.refcount
+= 1;
1899 case R_X86_64_SIZE32
:
1900 case R_X86_64_SIZE64
:
1905 if (!ABI_64_P (abfd
))
1910 /* Let's help debug shared library creation. These relocs
1911 cannot be used in shared libs. Don't error out for
1912 sections we don't care about, such as debug sections or
1913 non-constant sections. */
1915 && (sec
->flags
& SEC_ALLOC
) != 0
1916 && (sec
->flags
& SEC_READONLY
) != 0)
1919 name
= h
->root
.root
.string
;
1921 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1922 (*_bfd_error_handler
)
1923 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1924 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1925 bfd_set_error (bfd_error_bad_value
);
1933 case R_X86_64_PC32_BND
:
1937 if (h
!= NULL
&& info
->executable
)
1939 /* If this reloc is in a read-only section, we might
1940 need a copy reloc. We can't check reliably at this
1941 stage whether the section is read-only, as input
1942 sections have not yet been mapped to output sections.
1943 Tentatively set the flag for now, and correct in
1944 adjust_dynamic_symbol. */
1947 /* We may need a .plt entry if the function this reloc
1948 refers to is in a shared lib. */
1949 h
->plt
.refcount
+= 1;
1950 if (r_type
!= R_X86_64_PC32
1951 && r_type
!= R_X86_64_PC32_BND
1952 && r_type
!= R_X86_64_PC64
)
1953 h
->pointer_equality_needed
= 1;
1958 /* If we are creating a shared library, and this is a reloc
1959 against a global symbol, or a non PC relative reloc
1960 against a local symbol, then we need to copy the reloc
1961 into the shared library. However, if we are linking with
1962 -Bsymbolic, we do not need to copy a reloc against a
1963 global symbol which is defined in an object we are
1964 including in the link (i.e., DEF_REGULAR is set). At
1965 this point we have not seen all the input files, so it is
1966 possible that DEF_REGULAR is not set now but will be set
1967 later (it is never cleared). In case of a weak definition,
1968 DEF_REGULAR may be cleared later by a strong definition in
1969 a shared library. We account for that possibility below by
1970 storing information in the relocs_copied field of the hash
1971 table entry. A similar situation occurs when creating
1972 shared libraries and symbol visibility changes render the
1975 If on the other hand, we are creating an executable, we
1976 may need to keep relocations for symbols satisfied by a
1977 dynamic library if we manage to avoid copy relocs for the
1980 && (sec
->flags
& SEC_ALLOC
) != 0
1981 && (! IS_X86_64_PCREL_TYPE (r_type
)
1983 && (! SYMBOLIC_BIND (info
, h
)
1984 || h
->root
.type
== bfd_link_hash_defweak
1985 || !h
->def_regular
))))
1986 || (ELIMINATE_COPY_RELOCS
1988 && (sec
->flags
& SEC_ALLOC
) != 0
1990 && (h
->root
.type
== bfd_link_hash_defweak
1991 || !h
->def_regular
)))
1993 struct elf_dyn_relocs
*p
;
1994 struct elf_dyn_relocs
**head
;
1996 /* We must copy these reloc types into the output file.
1997 Create a reloc section in dynobj and make room for
2001 if (htab
->elf
.dynobj
== NULL
)
2002 htab
->elf
.dynobj
= abfd
;
2004 sreloc
= _bfd_elf_make_dynamic_reloc_section
2005 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
2006 abfd
, /*rela?*/ TRUE
);
2012 /* If this is a global symbol, we count the number of
2013 relocations we need for this symbol. */
2016 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
2020 /* Track dynamic relocs needed for local syms too.
2021 We really need local syms available to do this
2026 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2031 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2035 /* Beware of type punned pointers vs strict aliasing
2037 vpp
= &(elf_section_data (s
)->local_dynrel
);
2038 head
= (struct elf_dyn_relocs
**)vpp
;
2042 if (p
== NULL
|| p
->sec
!= sec
)
2044 bfd_size_type amt
= sizeof *p
;
2046 p
= ((struct elf_dyn_relocs
*)
2047 bfd_alloc (htab
->elf
.dynobj
, amt
));
2058 /* Count size relocation as PC-relative relocation. */
2059 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2064 /* This relocation describes the C++ object vtable hierarchy.
2065 Reconstruct it for later use during GC. */
2066 case R_X86_64_GNU_VTINHERIT
:
2067 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2071 /* This relocation describes which C++ vtable entries are actually
2072 used. Record for later use during GC. */
2073 case R_X86_64_GNU_VTENTRY
:
2074 BFD_ASSERT (h
!= NULL
);
2076 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2086 && h
->plt
.refcount
> 0
2087 && (((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2088 || h
->got
.refcount
> 0)
2089 && htab
->plt_got
== NULL
)
2091 /* Create the GOT procedure linkage table. */
2092 unsigned int plt_got_align
;
2093 const struct elf_backend_data
*bed
;
2095 bed
= get_elf_backend_data (info
->output_bfd
);
2096 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry
) == 8
2097 && (sizeof (elf_x86_64_bnd_plt2_entry
)
2098 == sizeof (elf_x86_64_legacy_plt2_entry
)));
2101 if (htab
->elf
.dynobj
== NULL
)
2102 htab
->elf
.dynobj
= abfd
;
2104 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2106 (bed
->dynamic_sec_flags
2111 if (htab
->plt_got
== NULL
2112 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2118 if (r_type
== R_X86_64_GOTPCREL
2119 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2120 sec
->need_convert_mov_to_lea
= 1;
2126 /* Return the section that should be marked against GC for a given
2130 elf_x86_64_gc_mark_hook (asection
*sec
,
2131 struct bfd_link_info
*info
,
2132 Elf_Internal_Rela
*rel
,
2133 struct elf_link_hash_entry
*h
,
2134 Elf_Internal_Sym
*sym
)
2137 switch (ELF32_R_TYPE (rel
->r_info
))
2139 case R_X86_64_GNU_VTINHERIT
:
2140 case R_X86_64_GNU_VTENTRY
:
2144 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2147 /* Update the got entry reference counts for the section being removed. */
2150 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
2152 const Elf_Internal_Rela
*relocs
)
2154 struct elf_x86_64_link_hash_table
*htab
;
2155 Elf_Internal_Shdr
*symtab_hdr
;
2156 struct elf_link_hash_entry
**sym_hashes
;
2157 bfd_signed_vma
*local_got_refcounts
;
2158 const Elf_Internal_Rela
*rel
, *relend
;
2160 if (info
->relocatable
)
2163 htab
= elf_x86_64_hash_table (info
);
2167 elf_section_data (sec
)->local_dynrel
= NULL
;
2169 symtab_hdr
= &elf_symtab_hdr (abfd
);
2170 sym_hashes
= elf_sym_hashes (abfd
);
2171 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2173 htab
= elf_x86_64_hash_table (info
);
2174 relend
= relocs
+ sec
->reloc_count
;
2175 for (rel
= relocs
; rel
< relend
; rel
++)
2177 unsigned long r_symndx
;
2178 unsigned int r_type
;
2179 struct elf_link_hash_entry
*h
= NULL
;
2181 r_symndx
= htab
->r_sym (rel
->r_info
);
2182 if (r_symndx
>= symtab_hdr
->sh_info
)
2184 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2185 while (h
->root
.type
== bfd_link_hash_indirect
2186 || h
->root
.type
== bfd_link_hash_warning
)
2187 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2191 /* A local symbol. */
2192 Elf_Internal_Sym
*isym
;
2194 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2197 /* Check relocation against local STT_GNU_IFUNC symbol. */
2199 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2201 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2209 struct elf_x86_64_link_hash_entry
*eh
;
2210 struct elf_dyn_relocs
**pp
;
2211 struct elf_dyn_relocs
*p
;
2213 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2215 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2218 /* Everything must go for SEC. */
2224 r_type
= ELF32_R_TYPE (rel
->r_info
);
2225 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2226 symtab_hdr
, sym_hashes
,
2227 &r_type
, GOT_UNKNOWN
,
2228 rel
, relend
, h
, r_symndx
))
2233 case R_X86_64_TLSLD
:
2234 if (htab
->tls_ld_got
.refcount
> 0)
2235 htab
->tls_ld_got
.refcount
-= 1;
2238 case R_X86_64_TLSGD
:
2239 case R_X86_64_GOTPC32_TLSDESC
:
2240 case R_X86_64_TLSDESC_CALL
:
2241 case R_X86_64_GOTTPOFF
:
2242 case R_X86_64_GOT32
:
2243 case R_X86_64_GOTPCREL
:
2244 case R_X86_64_GOT64
:
2245 case R_X86_64_GOTPCREL64
:
2246 case R_X86_64_GOTPLT64
:
2249 if (h
->got
.refcount
> 0)
2250 h
->got
.refcount
-= 1;
2251 if (h
->type
== STT_GNU_IFUNC
)
2253 if (h
->plt
.refcount
> 0)
2254 h
->plt
.refcount
-= 1;
2257 else if (local_got_refcounts
!= NULL
)
2259 if (local_got_refcounts
[r_symndx
] > 0)
2260 local_got_refcounts
[r_symndx
] -= 1;
2272 case R_X86_64_PC32_BND
:
2274 case R_X86_64_SIZE32
:
2275 case R_X86_64_SIZE64
:
2277 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2281 case R_X86_64_PLT32
:
2282 case R_X86_64_PLT32_BND
:
2283 case R_X86_64_PLTOFF64
:
2286 if (h
->plt
.refcount
> 0)
2287 h
->plt
.refcount
-= 1;
2299 /* Adjust a symbol defined by a dynamic object and referenced by a
2300 regular object. The current definition is in some section of the
2301 dynamic object, but we're not including those sections. We have to
2302 change the definition to something the rest of the link can
2306 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2307 struct elf_link_hash_entry
*h
)
2309 struct elf_x86_64_link_hash_table
*htab
;
2311 struct elf_x86_64_link_hash_entry
*eh
;
2312 struct elf_dyn_relocs
*p
;
2314 /* STT_GNU_IFUNC symbol must go through PLT. */
2315 if (h
->type
== STT_GNU_IFUNC
)
2317 /* All local STT_GNU_IFUNC references must be treate as local
2318 calls via local PLT. */
2320 && SYMBOL_CALLS_LOCAL (info
, h
))
2322 bfd_size_type pc_count
= 0, count
= 0;
2323 struct elf_dyn_relocs
**pp
;
2325 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2326 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2328 pc_count
+= p
->pc_count
;
2329 p
->count
-= p
->pc_count
;
2338 if (pc_count
|| count
)
2342 if (h
->plt
.refcount
<= 0)
2343 h
->plt
.refcount
= 1;
2345 h
->plt
.refcount
+= 1;
2349 if (h
->plt
.refcount
<= 0)
2351 h
->plt
.offset
= (bfd_vma
) -1;
2357 /* If this is a function, put it in the procedure linkage table. We
2358 will fill in the contents of the procedure linkage table later,
2359 when we know the address of the .got section. */
2360 if (h
->type
== STT_FUNC
2363 if (h
->plt
.refcount
<= 0
2364 || SYMBOL_CALLS_LOCAL (info
, h
)
2365 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2366 && h
->root
.type
== bfd_link_hash_undefweak
))
2368 /* This case can occur if we saw a PLT32 reloc in an input
2369 file, but the symbol was never referred to by a dynamic
2370 object, or if all references were garbage collected. In
2371 such a case, we don't actually need to build a procedure
2372 linkage table, and we can just do a PC32 reloc instead. */
2373 h
->plt
.offset
= (bfd_vma
) -1;
2380 /* It's possible that we incorrectly decided a .plt reloc was
2381 needed for an R_X86_64_PC32 reloc to a non-function sym in
2382 check_relocs. We can't decide accurately between function and
2383 non-function syms in check-relocs; Objects loaded later in
2384 the link may change h->type. So fix it now. */
2385 h
->plt
.offset
= (bfd_vma
) -1;
2387 /* If this is a weak symbol, and there is a real definition, the
2388 processor independent code will have arranged for us to see the
2389 real definition first, and we can just use the same value. */
2390 if (h
->u
.weakdef
!= NULL
)
2392 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2393 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2394 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2395 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2396 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2398 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2399 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2400 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
2405 /* This is a reference to a symbol defined by a dynamic object which
2406 is not a function. */
2408 /* If we are creating a shared library, we must presume that the
2409 only references to the symbol are via the global offset table.
2410 For such cases we need not do anything here; the relocations will
2411 be handled correctly by relocate_section. */
2412 if (!info
->executable
)
2415 /* If there are no references to this symbol that do not use the
2416 GOT, we don't need to generate a copy reloc. */
2417 if (!h
->non_got_ref
)
2420 /* If -z nocopyreloc was given, we won't generate them either. */
2421 if (info
->nocopyreloc
)
2427 if (ELIMINATE_COPY_RELOCS
)
2429 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2430 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2432 s
= p
->sec
->output_section
;
2433 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2437 /* If we didn't find any dynamic relocs in read-only sections, then
2438 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2446 /* We must allocate the symbol in our .dynbss section, which will
2447 become part of the .bss section of the executable. There will be
2448 an entry for this symbol in the .dynsym section. The dynamic
2449 object will contain position independent code, so all references
2450 from the dynamic object to this symbol will go through the global
2451 offset table. The dynamic linker will use the .dynsym entry to
2452 determine the address it must put in the global offset table, so
2453 both the dynamic object and the regular object will refer to the
2454 same memory location for the variable. */
2456 htab
= elf_x86_64_hash_table (info
);
2460 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2461 to copy the initial value out of the dynamic object and into the
2462 runtime process image. */
2463 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2465 const struct elf_backend_data
*bed
;
2466 bed
= get_elf_backend_data (info
->output_bfd
);
2467 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2473 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
2476 /* Allocate space in .plt, .got and associated reloc sections for
2480 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2482 struct bfd_link_info
*info
;
2483 struct elf_x86_64_link_hash_table
*htab
;
2484 struct elf_x86_64_link_hash_entry
*eh
;
2485 struct elf_dyn_relocs
*p
;
2486 const struct elf_backend_data
*bed
;
2487 unsigned int plt_entry_size
;
2489 if (h
->root
.type
== bfd_link_hash_indirect
)
2492 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2494 info
= (struct bfd_link_info
*) inf
;
2495 htab
= elf_x86_64_hash_table (info
);
2498 bed
= get_elf_backend_data (info
->output_bfd
);
2499 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2501 /* We can't use the GOT PLT if pointer equality is needed since
2502 finish_dynamic_symbol won't clear symbol value and the dynamic
2503 linker won't update the GOT slot. We will get into an infinite
2504 loop at run-time. */
2505 if (htab
->plt_got
!= NULL
2506 && h
->type
!= STT_GNU_IFUNC
2507 && !h
->pointer_equality_needed
2508 && h
->plt
.refcount
> 0
2509 && h
->got
.refcount
> 0)
2511 /* Don't use the regular PLT if there are both GOT and GOTPLT
2513 h
->plt
.offset
= (bfd_vma
) -1;
2515 /* Use the GOT PLT. */
2516 eh
->plt_got
.refcount
= 1;
2519 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2520 here if it is defined and referenced in a non-shared object. */
2521 if (h
->type
== STT_GNU_IFUNC
2524 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2530 asection
*s
= htab
->plt_bnd
;
2531 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
2533 /* Use the .plt.bnd section if it is created. */
2534 eh
->plt_bnd
.offset
= s
->size
;
2536 /* Make room for this entry in the .plt.bnd section. */
2537 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2545 else if (htab
->elf
.dynamic_sections_created
2546 && (h
->plt
.refcount
> 0 || eh
->plt_got
.refcount
> 0))
2548 bfd_boolean use_plt_got
;
2550 if ((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2552 /* Don't use the regular PLT for DF_BIND_NOW. */
2553 h
->plt
.offset
= (bfd_vma
) -1;
2555 /* Use the GOT PLT. */
2556 h
->got
.refcount
= 1;
2557 eh
->plt_got
.refcount
= 1;
2560 use_plt_got
= eh
->plt_got
.refcount
> 0;
2562 /* Make sure this symbol is output as a dynamic symbol.
2563 Undefined weak syms won't yet be marked as dynamic. */
2564 if (h
->dynindx
== -1
2565 && !h
->forced_local
)
2567 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2572 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2574 asection
*s
= htab
->elf
.splt
;
2575 asection
*bnd_s
= htab
->plt_bnd
;
2576 asection
*got_s
= htab
->plt_got
;
2578 /* If this is the first .plt entry, make room for the special
2579 first entry. The .plt section is used by prelink to undo
2580 prelinking for dynamic relocations. */
2582 s
->size
= plt_entry_size
;
2585 eh
->plt_got
.offset
= got_s
->size
;
2588 h
->plt
.offset
= s
->size
;
2590 eh
->plt_bnd
.offset
= bnd_s
->size
;
2593 /* If this symbol is not defined in a regular file, and we are
2594 not generating a shared library, then set the symbol to this
2595 location in the .plt. This is required to make function
2596 pointers compare as equal between the normal executable and
2597 the shared library. */
2603 /* We need to make a call to the entry of the GOT PLT
2604 instead of regular PLT entry. */
2605 h
->root
.u
.def
.section
= got_s
;
2606 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
2612 /* We need to make a call to the entry of the second
2613 PLT instead of regular PLT entry. */
2614 h
->root
.u
.def
.section
= bnd_s
;
2615 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
2619 h
->root
.u
.def
.section
= s
;
2620 h
->root
.u
.def
.value
= h
->plt
.offset
;
2625 /* Make room for this entry. */
2627 got_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2630 s
->size
+= plt_entry_size
;
2632 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2634 /* We also need to make an entry in the .got.plt section,
2635 which will be placed in the .got section by the linker
2637 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2639 /* We also need to make an entry in the .rela.plt
2641 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2642 htab
->elf
.srelplt
->reloc_count
++;
2647 h
->plt
.offset
= (bfd_vma
) -1;
2653 h
->plt
.offset
= (bfd_vma
) -1;
2657 eh
->tlsdesc_got
= (bfd_vma
) -1;
2659 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2660 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2661 if (h
->got
.refcount
> 0
2664 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2666 h
->got
.offset
= (bfd_vma
) -1;
2668 else if (h
->got
.refcount
> 0)
2672 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2674 /* Make sure this symbol is output as a dynamic symbol.
2675 Undefined weak syms won't yet be marked as dynamic. */
2676 if (h
->dynindx
== -1
2677 && !h
->forced_local
)
2679 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2683 if (GOT_TLS_GDESC_P (tls_type
))
2685 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2686 - elf_x86_64_compute_jump_table_size (htab
);
2687 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2688 h
->got
.offset
= (bfd_vma
) -2;
2690 if (! GOT_TLS_GDESC_P (tls_type
)
2691 || GOT_TLS_GD_P (tls_type
))
2694 h
->got
.offset
= s
->size
;
2695 s
->size
+= GOT_ENTRY_SIZE
;
2696 if (GOT_TLS_GD_P (tls_type
))
2697 s
->size
+= GOT_ENTRY_SIZE
;
2699 dyn
= htab
->elf
.dynamic_sections_created
;
2700 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2702 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2703 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2704 || tls_type
== GOT_TLS_IE
)
2705 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2706 else if (GOT_TLS_GD_P (tls_type
))
2707 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2708 else if (! GOT_TLS_GDESC_P (tls_type
)
2709 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2710 || h
->root
.type
!= bfd_link_hash_undefweak
)
2712 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2713 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2714 if (GOT_TLS_GDESC_P (tls_type
))
2716 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2717 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2721 h
->got
.offset
= (bfd_vma
) -1;
2723 if (eh
->dyn_relocs
== NULL
)
2726 /* In the shared -Bsymbolic case, discard space allocated for
2727 dynamic pc-relative relocs against symbols which turn out to be
2728 defined in regular objects. For the normal shared case, discard
2729 space for pc-relative relocs that have become local due to symbol
2730 visibility changes. */
2734 /* Relocs that use pc_count are those that appear on a call
2735 insn, or certain REL relocs that can generated via assembly.
2736 We want calls to protected symbols to resolve directly to the
2737 function rather than going via the plt. If people want
2738 function pointer comparisons to work as expected then they
2739 should avoid writing weird assembly. */
2740 if (SYMBOL_CALLS_LOCAL (info
, h
))
2742 struct elf_dyn_relocs
**pp
;
2744 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2746 p
->count
-= p
->pc_count
;
2755 /* Also discard relocs on undefined weak syms with non-default
2757 if (eh
->dyn_relocs
!= NULL
)
2759 if (h
->root
.type
== bfd_link_hash_undefweak
)
2761 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2762 eh
->dyn_relocs
= NULL
;
2764 /* Make sure undefined weak symbols are output as a dynamic
2766 else if (h
->dynindx
== -1
2767 && ! h
->forced_local
2768 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2771 /* For PIE, discard space for pc-relative relocs against
2772 symbols which turn out to need copy relocs. */
2773 else if (info
->executable
2774 && (h
->needs_copy
|| eh
->needs_copy
)
2778 struct elf_dyn_relocs
**pp
;
2780 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2782 if (p
->pc_count
!= 0)
2790 else if (ELIMINATE_COPY_RELOCS
)
2792 /* For the non-shared case, discard space for relocs against
2793 symbols which turn out to need copy relocs or are not
2799 || (htab
->elf
.dynamic_sections_created
2800 && (h
->root
.type
== bfd_link_hash_undefweak
2801 || h
->root
.type
== bfd_link_hash_undefined
))))
2803 /* Make sure this symbol is output as a dynamic symbol.
2804 Undefined weak syms won't yet be marked as dynamic. */
2805 if (h
->dynindx
== -1
2806 && ! h
->forced_local
2807 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2810 /* If that succeeded, we know we'll be keeping all the
2812 if (h
->dynindx
!= -1)
2816 eh
->dyn_relocs
= NULL
;
2821 /* Finally, allocate space. */
2822 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2826 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2828 BFD_ASSERT (sreloc
!= NULL
);
2830 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2836 /* Allocate space in .plt, .got and associated reloc sections for
2837 local dynamic relocs. */
2840 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2842 struct elf_link_hash_entry
*h
2843 = (struct elf_link_hash_entry
*) *slot
;
2845 if (h
->type
!= STT_GNU_IFUNC
2849 || h
->root
.type
!= bfd_link_hash_defined
)
2852 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2855 /* Find any dynamic relocs that apply to read-only sections. */
2858 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2861 struct elf_x86_64_link_hash_entry
*eh
;
2862 struct elf_dyn_relocs
*p
;
2864 /* Skip local IFUNC symbols. */
2865 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2868 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2869 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2871 asection
*s
= p
->sec
->output_section
;
2873 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2875 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2877 info
->flags
|= DF_TEXTREL
;
2879 if ((info
->warn_shared_textrel
&& info
->shared
)
2880 || info
->error_textrel
)
2881 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2882 p
->sec
->owner
, h
->root
.root
.string
,
2885 /* Not an error, just cut short the traversal. */
2893 mov foo@GOTPCREL(%rip), %reg
2896 with the local symbol, foo. */
2899 elf_x86_64_convert_mov_to_lea (bfd
*abfd
, asection
*sec
,
2900 struct bfd_link_info
*link_info
)
2902 Elf_Internal_Shdr
*symtab_hdr
;
2903 Elf_Internal_Rela
*internal_relocs
;
2904 Elf_Internal_Rela
*irel
, *irelend
;
2906 struct elf_x86_64_link_hash_table
*htab
;
2907 bfd_boolean changed_contents
;
2908 bfd_boolean changed_relocs
;
2909 bfd_signed_vma
*local_got_refcounts
;
2910 bfd_vma maxpagesize
;
2912 /* Don't even try to convert non-ELF outputs. */
2913 if (!is_elf_hash_table (link_info
->hash
))
2916 /* Nothing to do if there is no need or no output. */
2917 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
2918 || sec
->need_convert_mov_to_lea
== 0
2919 || bfd_is_abs_section (sec
->output_section
))
2922 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2924 /* Load the relocations for this section. */
2925 internal_relocs
= (_bfd_elf_link_read_relocs
2926 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
2927 link_info
->keep_memory
));
2928 if (internal_relocs
== NULL
)
2931 htab
= elf_x86_64_hash_table (link_info
);
2932 changed_contents
= FALSE
;
2933 changed_relocs
= FALSE
;
2934 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2935 maxpagesize
= get_elf_backend_data (abfd
)->maxpagesize
;
2937 /* Get the section contents. */
2938 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
2939 contents
= elf_section_data (sec
)->this_hdr
.contents
;
2942 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
2946 irelend
= internal_relocs
+ sec
->reloc_count
;
2947 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
2949 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
2950 unsigned int r_symndx
= htab
->r_sym (irel
->r_info
);
2952 struct elf_link_hash_entry
*h
;
2958 } convert_mov_to_lea
;
2959 unsigned int opcode
;
2961 if (r_type
!= R_X86_64_GOTPCREL
)
2964 roff
= irel
->r_offset
;
2969 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
2971 /* PR ld/18591: Don't convert R_X86_64_GOTPCREL relocation if it
2972 isn't for mov instruction. */
2977 convert_mov_to_lea
= none
;
2979 /* Get the symbol referred to by the reloc. */
2980 if (r_symndx
< symtab_hdr
->sh_info
)
2982 Elf_Internal_Sym
*isym
;
2984 /* Silence older GCC warning. */
2987 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2990 symtype
= ELF_ST_TYPE (isym
->st_info
);
2992 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation and
2993 skip relocation against undefined symbols. */
2994 if (symtype
!= STT_GNU_IFUNC
&& isym
->st_shndx
!= SHN_UNDEF
)
2996 if (isym
->st_shndx
== SHN_ABS
)
2997 tsec
= bfd_abs_section_ptr
;
2998 else if (isym
->st_shndx
== SHN_COMMON
)
2999 tsec
= bfd_com_section_ptr
;
3000 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
3001 tsec
= &_bfd_elf_large_com_section
;
3003 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3005 toff
= isym
->st_value
;
3006 convert_mov_to_lea
= local
;
3011 indx
= r_symndx
- symtab_hdr
->sh_info
;
3012 h
= elf_sym_hashes (abfd
)[indx
];
3013 BFD_ASSERT (h
!= NULL
);
3015 while (h
->root
.type
== bfd_link_hash_indirect
3016 || h
->root
.type
== bfd_link_hash_warning
)
3017 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3019 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
3020 avoid optimizing _DYNAMIC since ld.so may use its link-time
3023 && h
->type
!= STT_GNU_IFUNC
3024 && h
!= htab
->elf
.hdynamic
3025 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3027 tsec
= h
->root
.u
.def
.section
;
3028 toff
= h
->root
.u
.def
.value
;
3030 convert_mov_to_lea
= global
;
3034 if (convert_mov_to_lea
== none
)
3037 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3039 /* At this stage in linking, no SEC_MERGE symbol has been
3040 adjusted, so all references to such symbols need to be
3041 passed through _bfd_merged_section_offset. (Later, in
3042 relocate_section, all SEC_MERGE symbols *except* for
3043 section symbols have been adjusted.)
3045 gas may reduce relocations against symbols in SEC_MERGE
3046 sections to a relocation against the section symbol when
3047 the original addend was zero. When the reloc is against
3048 a section symbol we should include the addend in the
3049 offset passed to _bfd_merged_section_offset, since the
3050 location of interest is the original symbol. On the
3051 other hand, an access to "sym+addend" where "sym" is not
3052 a section symbol should not include the addend; Such an
3053 access is presumed to be an offset from "sym"; The
3054 location of interest is just "sym". */
3055 if (symtype
== STT_SECTION
)
3056 toff
+= irel
->r_addend
;
3058 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3059 elf_section_data (tsec
)->sec_info
,
3062 if (symtype
!= STT_SECTION
)
3063 toff
+= irel
->r_addend
;
3066 toff
+= irel
->r_addend
;
3068 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3069 if (tsec
->output_section
== sec
->output_section
)
3071 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3079 /* At this point, we don't know the load addresses of TSEC
3080 section nor SEC section. We estimate the distrance between
3083 for (asect
= sec
->output_section
;
3084 asect
!= NULL
&& asect
!= tsec
->output_section
;
3085 asect
= asect
->next
)
3088 for (i
= asect
->output_section
->map_head
.s
;
3092 size
= align_power (size
, i
->alignment_power
);
3097 /* Don't convert R_X86_64_GOTPCREL if TSEC isn't placed after
3102 /* Take PT_GNU_RELRO segment into account by adding
3104 if ((toff
+ size
+ maxpagesize
- roff
+ 0x80000000)
3109 bfd_put_8 (abfd
, 0x8d, contents
+ roff
- 2);
3110 irel
->r_info
= htab
->r_info (r_symndx
, R_X86_64_PC32
);
3111 changed_contents
= TRUE
;
3112 changed_relocs
= TRUE
;
3114 if (convert_mov_to_lea
== local
)
3116 if (local_got_refcounts
!= NULL
3117 && local_got_refcounts
[r_symndx
] > 0)
3118 local_got_refcounts
[r_symndx
] -= 1;
3122 if (h
->got
.refcount
> 0)
3123 h
->got
.refcount
-= 1;
3127 if (contents
!= NULL
3128 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3130 if (!changed_contents
&& !link_info
->keep_memory
)
3134 /* Cache the section contents for elf_link_input_bfd. */
3135 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3139 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3141 if (!changed_relocs
)
3142 free (internal_relocs
);
3144 elf_section_data (sec
)->relocs
= internal_relocs
;
3150 if (contents
!= NULL
3151 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3153 if (internal_relocs
!= NULL
3154 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3155 free (internal_relocs
);
3159 /* Set the sizes of the dynamic sections. */
3162 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3163 struct bfd_link_info
*info
)
3165 struct elf_x86_64_link_hash_table
*htab
;
3170 const struct elf_backend_data
*bed
;
3172 htab
= elf_x86_64_hash_table (info
);
3175 bed
= get_elf_backend_data (output_bfd
);
3177 dynobj
= htab
->elf
.dynobj
;
3181 if (htab
->elf
.dynamic_sections_created
)
3183 /* Set the contents of the .interp section to the interpreter. */
3184 if (info
->executable
)
3186 s
= bfd_get_linker_section (dynobj
, ".interp");
3189 s
->size
= htab
->dynamic_interpreter_size
;
3190 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3194 /* Set up .got offsets for local syms, and space for local dynamic
3196 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3198 bfd_signed_vma
*local_got
;
3199 bfd_signed_vma
*end_local_got
;
3200 char *local_tls_type
;
3201 bfd_vma
*local_tlsdesc_gotent
;
3202 bfd_size_type locsymcount
;
3203 Elf_Internal_Shdr
*symtab_hdr
;
3206 if (! is_x86_64_elf (ibfd
))
3209 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3211 struct elf_dyn_relocs
*p
;
3213 if (!elf_x86_64_convert_mov_to_lea (ibfd
, s
, info
))
3216 for (p
= (struct elf_dyn_relocs
*)
3217 (elf_section_data (s
)->local_dynrel
);
3221 if (!bfd_is_abs_section (p
->sec
)
3222 && bfd_is_abs_section (p
->sec
->output_section
))
3224 /* Input section has been discarded, either because
3225 it is a copy of a linkonce section or due to
3226 linker script /DISCARD/, so we'll be discarding
3229 else if (p
->count
!= 0)
3231 srel
= elf_section_data (p
->sec
)->sreloc
;
3232 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3233 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3234 && (info
->flags
& DF_TEXTREL
) == 0)
3236 info
->flags
|= DF_TEXTREL
;
3237 if ((info
->warn_shared_textrel
&& info
->shared
)
3238 || info
->error_textrel
)
3239 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3240 p
->sec
->owner
, p
->sec
);
3246 local_got
= elf_local_got_refcounts (ibfd
);
3250 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3251 locsymcount
= symtab_hdr
->sh_info
;
3252 end_local_got
= local_got
+ locsymcount
;
3253 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3254 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3256 srel
= htab
->elf
.srelgot
;
3257 for (; local_got
< end_local_got
;
3258 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3260 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3263 if (GOT_TLS_GDESC_P (*local_tls_type
))
3265 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3266 - elf_x86_64_compute_jump_table_size (htab
);
3267 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3268 *local_got
= (bfd_vma
) -2;
3270 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3271 || GOT_TLS_GD_P (*local_tls_type
))
3273 *local_got
= s
->size
;
3274 s
->size
+= GOT_ENTRY_SIZE
;
3275 if (GOT_TLS_GD_P (*local_tls_type
))
3276 s
->size
+= GOT_ENTRY_SIZE
;
3279 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3280 || *local_tls_type
== GOT_TLS_IE
)
3282 if (GOT_TLS_GDESC_P (*local_tls_type
))
3284 htab
->elf
.srelplt
->size
3285 += bed
->s
->sizeof_rela
;
3286 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3288 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3289 || GOT_TLS_GD_P (*local_tls_type
))
3290 srel
->size
+= bed
->s
->sizeof_rela
;
3294 *local_got
= (bfd_vma
) -1;
3298 if (htab
->tls_ld_got
.refcount
> 0)
3300 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3302 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3303 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3304 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3307 htab
->tls_ld_got
.offset
= -1;
3309 /* Allocate global sym .plt and .got entries, and space for global
3310 sym dynamic relocs. */
3311 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3314 /* Allocate .plt and .got entries, and space for local symbols. */
3315 htab_traverse (htab
->loc_hash_table
,
3316 elf_x86_64_allocate_local_dynrelocs
,
3319 /* For every jump slot reserved in the sgotplt, reloc_count is
3320 incremented. However, when we reserve space for TLS descriptors,
3321 it's not incremented, so in order to compute the space reserved
3322 for them, it suffices to multiply the reloc count by the jump
3325 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3326 so that R_X86_64_IRELATIVE entries come last. */
3327 if (htab
->elf
.srelplt
)
3329 htab
->sgotplt_jump_table_size
3330 = elf_x86_64_compute_jump_table_size (htab
);
3331 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3333 else if (htab
->elf
.irelplt
)
3334 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3336 if (htab
->tlsdesc_plt
)
3338 /* If we're not using lazy TLS relocations, don't generate the
3339 PLT and GOT entries they require. */
3340 if ((info
->flags
& DF_BIND_NOW
))
3341 htab
->tlsdesc_plt
= 0;
3344 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3345 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3346 /* Reserve room for the initial entry.
3347 FIXME: we could probably do away with it in this case. */
3348 if (htab
->elf
.splt
->size
== 0)
3349 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3350 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3351 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3355 if (htab
->elf
.sgotplt
)
3357 /* Don't allocate .got.plt section if there are no GOT nor PLT
3358 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3359 if ((htab
->elf
.hgot
== NULL
3360 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3361 && (htab
->elf
.sgotplt
->size
3362 == get_elf_backend_data (output_bfd
)->got_header_size
)
3363 && (htab
->elf
.splt
== NULL
3364 || htab
->elf
.splt
->size
== 0)
3365 && (htab
->elf
.sgot
== NULL
3366 || htab
->elf
.sgot
->size
== 0)
3367 && (htab
->elf
.iplt
== NULL
3368 || htab
->elf
.iplt
->size
== 0)
3369 && (htab
->elf
.igotplt
== NULL
3370 || htab
->elf
.igotplt
->size
== 0))
3371 htab
->elf
.sgotplt
->size
= 0;
3374 if (htab
->plt_eh_frame
!= NULL
3375 && htab
->elf
.splt
!= NULL
3376 && htab
->elf
.splt
->size
!= 0
3377 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3378 && _bfd_elf_eh_frame_present (info
))
3380 const struct elf_x86_64_backend_data
*arch_data
3381 = get_elf_x86_64_arch_data (bed
);
3382 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3385 /* We now have determined the sizes of the various dynamic sections.
3386 Allocate memory for them. */
3388 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3390 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3393 if (s
== htab
->elf
.splt
3394 || s
== htab
->elf
.sgot
3395 || s
== htab
->elf
.sgotplt
3396 || s
== htab
->elf
.iplt
3397 || s
== htab
->elf
.igotplt
3398 || s
== htab
->plt_bnd
3399 || s
== htab
->plt_got
3400 || s
== htab
->plt_eh_frame
3401 || s
== htab
->sdynbss
)
3403 /* Strip this section if we don't need it; see the
3406 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3408 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3411 /* We use the reloc_count field as a counter if we need
3412 to copy relocs into the output file. */
3413 if (s
!= htab
->elf
.srelplt
)
3418 /* It's not one of our sections, so don't allocate space. */
3424 /* If we don't need this section, strip it from the
3425 output file. This is mostly to handle .rela.bss and
3426 .rela.plt. We must create both sections in
3427 create_dynamic_sections, because they must be created
3428 before the linker maps input sections to output
3429 sections. The linker does that before
3430 adjust_dynamic_symbol is called, and it is that
3431 function which decides whether anything needs to go
3432 into these sections. */
3434 s
->flags
|= SEC_EXCLUDE
;
3438 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3441 /* Allocate memory for the section contents. We use bfd_zalloc
3442 here in case unused entries are not reclaimed before the
3443 section's contents are written out. This should not happen,
3444 but this way if it does, we get a R_X86_64_NONE reloc instead
3446 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3447 if (s
->contents
== NULL
)
3451 if (htab
->plt_eh_frame
!= NULL
3452 && htab
->plt_eh_frame
->contents
!= NULL
)
3454 const struct elf_x86_64_backend_data
*arch_data
3455 = get_elf_x86_64_arch_data (bed
);
3457 memcpy (htab
->plt_eh_frame
->contents
,
3458 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3459 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3460 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3463 if (htab
->elf
.dynamic_sections_created
)
3465 /* Add some entries to the .dynamic section. We fill in the
3466 values later, in elf_x86_64_finish_dynamic_sections, but we
3467 must add the entries now so that we get the correct size for
3468 the .dynamic section. The DT_DEBUG entry is filled in by the
3469 dynamic linker and used by the debugger. */
3470 #define add_dynamic_entry(TAG, VAL) \
3471 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3473 if (info
->executable
)
3475 if (!add_dynamic_entry (DT_DEBUG
, 0))
3479 if (htab
->elf
.splt
->size
!= 0)
3481 /* DT_PLTGOT is used by prelink even if there is no PLT
3483 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3486 if (htab
->elf
.srelplt
->size
!= 0)
3488 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3489 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3490 || !add_dynamic_entry (DT_JMPREL
, 0))
3494 if (htab
->tlsdesc_plt
3495 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3496 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3502 if (!add_dynamic_entry (DT_RELA
, 0)
3503 || !add_dynamic_entry (DT_RELASZ
, 0)
3504 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3507 /* If any dynamic relocs apply to a read-only section,
3508 then we need a DT_TEXTREL entry. */
3509 if ((info
->flags
& DF_TEXTREL
) == 0)
3510 elf_link_hash_traverse (&htab
->elf
,
3511 elf_x86_64_readonly_dynrelocs
,
3514 if ((info
->flags
& DF_TEXTREL
) != 0)
3516 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3517 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3519 info
->callbacks
->einfo
3520 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3521 bfd_set_error (bfd_error_bad_value
);
3525 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3530 #undef add_dynamic_entry
3536 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3537 struct bfd_link_info
*info
)
3539 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3543 struct elf_link_hash_entry
*tlsbase
;
3545 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3546 "_TLS_MODULE_BASE_",
3547 FALSE
, FALSE
, FALSE
);
3549 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3551 struct elf_x86_64_link_hash_table
*htab
;
3552 struct bfd_link_hash_entry
*bh
= NULL
;
3553 const struct elf_backend_data
*bed
3554 = get_elf_backend_data (output_bfd
);
3556 htab
= elf_x86_64_hash_table (info
);
3560 if (!(_bfd_generic_link_add_one_symbol
3561 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3562 tls_sec
, 0, NULL
, FALSE
,
3563 bed
->collect
, &bh
)))
3566 htab
->tls_module_base
= bh
;
3568 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3569 tlsbase
->def_regular
= 1;
3570 tlsbase
->other
= STV_HIDDEN
;
3571 tlsbase
->root
.linker_def
= 1;
3572 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3579 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3580 executables. Rather than setting it to the beginning of the TLS
3581 section, we have to set it to the end. This function may be called
3582 multiple times, it is idempotent. */
3585 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3587 struct elf_x86_64_link_hash_table
*htab
;
3588 struct bfd_link_hash_entry
*base
;
3590 if (!info
->executable
)
3593 htab
= elf_x86_64_hash_table (info
);
3597 base
= htab
->tls_module_base
;
3601 base
->u
.def
.value
= htab
->elf
.tls_size
;
3604 /* Return the base VMA address which should be subtracted from real addresses
3605 when resolving @dtpoff relocation.
3606 This is PT_TLS segment p_vaddr. */
3609 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3611 /* If tls_sec is NULL, we should have signalled an error already. */
3612 if (elf_hash_table (info
)->tls_sec
== NULL
)
3614 return elf_hash_table (info
)->tls_sec
->vma
;
3617 /* Return the relocation value for @tpoff relocation
3618 if STT_TLS virtual address is ADDRESS. */
3621 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3623 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3624 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3625 bfd_vma static_tls_size
;
3627 /* If tls_segment is NULL, we should have signalled an error already. */
3628 if (htab
->tls_sec
== NULL
)
3631 /* Consider special static TLS alignment requirements. */
3632 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3633 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3636 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3640 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3642 /* Opcode Instruction
3645 0x0f 0x8x conditional jump */
3647 && (contents
[offset
- 1] == 0xe8
3648 || contents
[offset
- 1] == 0xe9))
3650 && contents
[offset
- 2] == 0x0f
3651 && (contents
[offset
- 1] & 0xf0) == 0x80));
3654 /* Relocate an x86_64 ELF section. */
3657 elf_x86_64_relocate_section (bfd
*output_bfd
,
3658 struct bfd_link_info
*info
,
3660 asection
*input_section
,
3662 Elf_Internal_Rela
*relocs
,
3663 Elf_Internal_Sym
*local_syms
,
3664 asection
**local_sections
)
3666 struct elf_x86_64_link_hash_table
*htab
;
3667 Elf_Internal_Shdr
*symtab_hdr
;
3668 struct elf_link_hash_entry
**sym_hashes
;
3669 bfd_vma
*local_got_offsets
;
3670 bfd_vma
*local_tlsdesc_gotents
;
3671 Elf_Internal_Rela
*rel
;
3672 Elf_Internal_Rela
*relend
;
3673 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3675 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3677 htab
= elf_x86_64_hash_table (info
);
3680 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3681 sym_hashes
= elf_sym_hashes (input_bfd
);
3682 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3683 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3685 elf_x86_64_set_tls_module_base (info
);
3688 relend
= relocs
+ input_section
->reloc_count
;
3689 for (; rel
< relend
; rel
++)
3691 unsigned int r_type
;
3692 reloc_howto_type
*howto
;
3693 unsigned long r_symndx
;
3694 struct elf_link_hash_entry
*h
;
3695 struct elf_x86_64_link_hash_entry
*eh
;
3696 Elf_Internal_Sym
*sym
;
3698 bfd_vma off
, offplt
, plt_offset
;
3700 bfd_boolean unresolved_reloc
;
3701 bfd_reloc_status_type r
;
3703 asection
*base_got
, *resolved_plt
;
3706 r_type
= ELF32_R_TYPE (rel
->r_info
);
3707 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3708 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3711 if (r_type
>= (int) R_X86_64_standard
)
3713 (*_bfd_error_handler
)
3714 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3715 input_bfd
, input_section
, r_type
);
3716 bfd_set_error (bfd_error_bad_value
);
3720 if (r_type
!= (int) R_X86_64_32
3721 || ABI_64_P (output_bfd
))
3722 howto
= x86_64_elf_howto_table
+ r_type
;
3724 howto
= (x86_64_elf_howto_table
3725 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3726 r_symndx
= htab
->r_sym (rel
->r_info
);
3730 unresolved_reloc
= FALSE
;
3731 if (r_symndx
< symtab_hdr
->sh_info
)
3733 sym
= local_syms
+ r_symndx
;
3734 sec
= local_sections
[r_symndx
];
3736 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3738 st_size
= sym
->st_size
;
3740 /* Relocate against local STT_GNU_IFUNC symbol. */
3741 if (!info
->relocatable
3742 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3744 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3749 /* Set STT_GNU_IFUNC symbol value. */
3750 h
->root
.u
.def
.value
= sym
->st_value
;
3751 h
->root
.u
.def
.section
= sec
;
3756 bfd_boolean warned ATTRIBUTE_UNUSED
;
3757 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3759 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3760 r_symndx
, symtab_hdr
, sym_hashes
,
3762 unresolved_reloc
, warned
, ignored
);
3766 if (sec
!= NULL
&& discarded_section (sec
))
3767 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3768 rel
, 1, relend
, howto
, 0, contents
);
3770 if (info
->relocatable
)
3773 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
3775 if (r_type
== R_X86_64_64
)
3777 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3778 zero-extend it to 64bit if addend is zero. */
3779 r_type
= R_X86_64_32
;
3780 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3782 else if (r_type
== R_X86_64_SIZE64
)
3784 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3785 zero-extend it to 64bit if addend is zero. */
3786 r_type
= R_X86_64_SIZE32
;
3787 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3791 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3793 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3794 it here if it is defined in a non-shared object. */
3796 && h
->type
== STT_GNU_IFUNC
3802 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3804 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3805 sections because such sections are not SEC_ALLOC and
3806 thus ld.so will not process them. */
3807 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
3811 else if (h
->plt
.offset
== (bfd_vma
) -1)
3814 /* STT_GNU_IFUNC symbol must go through PLT. */
3815 if (htab
->elf
.splt
!= NULL
)
3817 if (htab
->plt_bnd
!= NULL
)
3819 resolved_plt
= htab
->plt_bnd
;
3820 plt_offset
= eh
->plt_bnd
.offset
;
3824 resolved_plt
= htab
->elf
.splt
;
3825 plt_offset
= h
->plt
.offset
;
3830 resolved_plt
= htab
->elf
.iplt
;
3831 plt_offset
= h
->plt
.offset
;
3834 relocation
= (resolved_plt
->output_section
->vma
3835 + resolved_plt
->output_offset
+ plt_offset
);
3840 if (h
->root
.root
.string
)
3841 name
= h
->root
.root
.string
;
3843 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3845 (*_bfd_error_handler
)
3846 (_("%B: relocation %s against STT_GNU_IFUNC "
3847 "symbol `%s' isn't handled by %s"), input_bfd
,
3848 x86_64_elf_howto_table
[r_type
].name
,
3849 name
, __FUNCTION__
);
3850 bfd_set_error (bfd_error_bad_value
);
3859 if (ABI_64_P (output_bfd
))
3863 if (rel
->r_addend
!= 0)
3865 if (h
->root
.root
.string
)
3866 name
= h
->root
.root
.string
;
3868 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3870 (*_bfd_error_handler
)
3871 (_("%B: relocation %s against STT_GNU_IFUNC "
3872 "symbol `%s' has non-zero addend: %d"),
3873 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
3874 name
, rel
->r_addend
);
3875 bfd_set_error (bfd_error_bad_value
);
3879 /* Generate dynamic relcoation only when there is a
3880 non-GOT reference in a shared object. */
3881 if (info
->shared
&& h
->non_got_ref
)
3883 Elf_Internal_Rela outrel
;
3886 /* Need a dynamic relocation to get the real function
3888 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
3892 if (outrel
.r_offset
== (bfd_vma
) -1
3893 || outrel
.r_offset
== (bfd_vma
) -2)
3896 outrel
.r_offset
+= (input_section
->output_section
->vma
3897 + input_section
->output_offset
);
3899 if (h
->dynindx
== -1
3901 || info
->executable
)
3903 /* This symbol is resolved locally. */
3904 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3905 outrel
.r_addend
= (h
->root
.u
.def
.value
3906 + h
->root
.u
.def
.section
->output_section
->vma
3907 + h
->root
.u
.def
.section
->output_offset
);
3911 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3912 outrel
.r_addend
= 0;
3915 sreloc
= htab
->elf
.irelifunc
;
3916 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3918 /* If this reloc is against an external symbol, we
3919 do not want to fiddle with the addend. Otherwise,
3920 we need to include the symbol value so that it
3921 becomes an addend for the dynamic reloc. For an
3922 internal symbol, we have updated addend. */
3927 case R_X86_64_PC32_BND
:
3929 case R_X86_64_PLT32
:
3930 case R_X86_64_PLT32_BND
:
3933 case R_X86_64_GOTPCREL
:
3934 case R_X86_64_GOTPCREL64
:
3935 base_got
= htab
->elf
.sgot
;
3936 off
= h
->got
.offset
;
3938 if (base_got
== NULL
)
3941 if (off
== (bfd_vma
) -1)
3943 /* We can't use h->got.offset here to save state, or
3944 even just remember the offset, as finish_dynamic_symbol
3945 would use that as offset into .got. */
3947 if (htab
->elf
.splt
!= NULL
)
3949 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3950 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3951 base_got
= htab
->elf
.sgotplt
;
3955 plt_index
= h
->plt
.offset
/ plt_entry_size
;
3956 off
= plt_index
* GOT_ENTRY_SIZE
;
3957 base_got
= htab
->elf
.igotplt
;
3960 if (h
->dynindx
== -1
3964 /* This references the local defitionion. We must
3965 initialize this entry in the global offset table.
3966 Since the offset must always be a multiple of 8,
3967 we use the least significant bit to record
3968 whether we have initialized it already.
3970 When doing a dynamic link, we create a .rela.got
3971 relocation entry to initialize the value. This
3972 is done in the finish_dynamic_symbol routine. */
3977 bfd_put_64 (output_bfd
, relocation
,
3978 base_got
->contents
+ off
);
3979 /* Note that this is harmless for the GOTPLT64
3980 case, as -1 | 1 still is -1. */
3986 relocation
= (base_got
->output_section
->vma
3987 + base_got
->output_offset
+ off
);
3993 /* When generating a shared object, the relocations handled here are
3994 copied into the output file to be resolved at run time. */
3997 case R_X86_64_GOT32
:
3998 case R_X86_64_GOT64
:
3999 /* Relocation is to the entry for this symbol in the global
4001 case R_X86_64_GOTPCREL
:
4002 case R_X86_64_GOTPCREL64
:
4003 /* Use global offset table entry as symbol value. */
4004 case R_X86_64_GOTPLT64
:
4005 /* This is obsolete and treated the the same as GOT64. */
4006 base_got
= htab
->elf
.sgot
;
4008 if (htab
->elf
.sgot
== NULL
)
4015 off
= h
->got
.offset
;
4017 && h
->plt
.offset
!= (bfd_vma
)-1
4018 && off
== (bfd_vma
)-1)
4020 /* We can't use h->got.offset here to save
4021 state, or even just remember the offset, as
4022 finish_dynamic_symbol would use that as offset into
4024 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4025 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4026 base_got
= htab
->elf
.sgotplt
;
4029 dyn
= htab
->elf
.dynamic_sections_created
;
4031 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
4033 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4034 || (ELF_ST_VISIBILITY (h
->other
)
4035 && h
->root
.type
== bfd_link_hash_undefweak
))
4037 /* This is actually a static link, or it is a -Bsymbolic
4038 link and the symbol is defined locally, or the symbol
4039 was forced to be local because of a version file. We
4040 must initialize this entry in the global offset table.
4041 Since the offset must always be a multiple of 8, we
4042 use the least significant bit to record whether we
4043 have initialized it already.
4045 When doing a dynamic link, we create a .rela.got
4046 relocation entry to initialize the value. This is
4047 done in the finish_dynamic_symbol routine. */
4052 bfd_put_64 (output_bfd
, relocation
,
4053 base_got
->contents
+ off
);
4054 /* Note that this is harmless for the GOTPLT64 case,
4055 as -1 | 1 still is -1. */
4060 unresolved_reloc
= FALSE
;
4064 if (local_got_offsets
== NULL
)
4067 off
= local_got_offsets
[r_symndx
];
4069 /* The offset must always be a multiple of 8. We use
4070 the least significant bit to record whether we have
4071 already generated the necessary reloc. */
4076 bfd_put_64 (output_bfd
, relocation
,
4077 base_got
->contents
+ off
);
4082 Elf_Internal_Rela outrel
;
4084 /* We need to generate a R_X86_64_RELATIVE reloc
4085 for the dynamic linker. */
4086 s
= htab
->elf
.srelgot
;
4090 outrel
.r_offset
= (base_got
->output_section
->vma
4091 + base_got
->output_offset
4093 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4094 outrel
.r_addend
= relocation
;
4095 elf_append_rela (output_bfd
, s
, &outrel
);
4098 local_got_offsets
[r_symndx
] |= 1;
4102 if (off
>= (bfd_vma
) -2)
4105 relocation
= base_got
->output_section
->vma
4106 + base_got
->output_offset
+ off
;
4107 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
4108 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4109 - htab
->elf
.sgotplt
->output_offset
;
4113 case R_X86_64_GOTOFF64
:
4114 /* Relocation is relative to the start of the global offset
4117 /* Check to make sure it isn't a protected function or data
4118 symbol for shared library since it may not be local when
4119 used as function address or with copy relocation. We also
4120 need to make sure that a symbol is referenced locally. */
4121 if (info
->shared
&& h
)
4123 if (!h
->def_regular
)
4127 switch (ELF_ST_VISIBILITY (h
->other
))
4130 v
= _("hidden symbol");
4133 v
= _("internal symbol");
4136 v
= _("protected symbol");
4143 (*_bfd_error_handler
)
4144 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4145 input_bfd
, v
, h
->root
.root
.string
);
4146 bfd_set_error (bfd_error_bad_value
);
4149 else if (!info
->executable
4150 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4151 && (h
->type
== STT_FUNC
4152 || h
->type
== STT_OBJECT
)
4153 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4155 (*_bfd_error_handler
)
4156 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4158 h
->type
== STT_FUNC
? "function" : "data",
4159 h
->root
.root
.string
);
4160 bfd_set_error (bfd_error_bad_value
);
4165 /* Note that sgot is not involved in this
4166 calculation. We always want the start of .got.plt. If we
4167 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4168 permitted by the ABI, we might have to change this
4170 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4171 + htab
->elf
.sgotplt
->output_offset
;
4174 case R_X86_64_GOTPC32
:
4175 case R_X86_64_GOTPC64
:
4176 /* Use global offset table as symbol value. */
4177 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4178 + htab
->elf
.sgotplt
->output_offset
;
4179 unresolved_reloc
= FALSE
;
4182 case R_X86_64_PLTOFF64
:
4183 /* Relocation is PLT entry relative to GOT. For local
4184 symbols it's the symbol itself relative to GOT. */
4186 /* See PLT32 handling. */
4187 && h
->plt
.offset
!= (bfd_vma
) -1
4188 && htab
->elf
.splt
!= NULL
)
4190 if (htab
->plt_bnd
!= NULL
)
4192 resolved_plt
= htab
->plt_bnd
;
4193 plt_offset
= eh
->plt_bnd
.offset
;
4197 resolved_plt
= htab
->elf
.splt
;
4198 plt_offset
= h
->plt
.offset
;
4201 relocation
= (resolved_plt
->output_section
->vma
4202 + resolved_plt
->output_offset
4204 unresolved_reloc
= FALSE
;
4207 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4208 + htab
->elf
.sgotplt
->output_offset
;
4211 case R_X86_64_PLT32
:
4212 case R_X86_64_PLT32_BND
:
4213 /* Relocation is to the entry for this symbol in the
4214 procedure linkage table. */
4216 /* Resolve a PLT32 reloc against a local symbol directly,
4217 without using the procedure linkage table. */
4221 if ((h
->plt
.offset
== (bfd_vma
) -1
4222 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4223 || htab
->elf
.splt
== NULL
)
4225 /* We didn't make a PLT entry for this symbol. This
4226 happens when statically linking PIC code, or when
4227 using -Bsymbolic. */
4231 if (h
->plt
.offset
!= (bfd_vma
) -1)
4233 if (htab
->plt_bnd
!= NULL
)
4235 resolved_plt
= htab
->plt_bnd
;
4236 plt_offset
= eh
->plt_bnd
.offset
;
4240 resolved_plt
= htab
->elf
.splt
;
4241 plt_offset
= h
->plt
.offset
;
4246 /* Use the GOT PLT. */
4247 resolved_plt
= htab
->plt_got
;
4248 plt_offset
= eh
->plt_got
.offset
;
4251 relocation
= (resolved_plt
->output_section
->vma
4252 + resolved_plt
->output_offset
4254 unresolved_reloc
= FALSE
;
4257 case R_X86_64_SIZE32
:
4258 case R_X86_64_SIZE64
:
4259 /* Set to symbol size. */
4260 relocation
= st_size
;
4266 case R_X86_64_PC32_BND
:
4267 /* Don't complain about -fPIC if the symbol is undefined when
4268 building executable. */
4270 && (input_section
->flags
& SEC_ALLOC
) != 0
4271 && (input_section
->flags
& SEC_READONLY
) != 0
4273 && !(info
->executable
4274 && h
->root
.type
== bfd_link_hash_undefined
))
4276 bfd_boolean fail
= FALSE
;
4278 = ((r_type
== R_X86_64_PC32
4279 || r_type
== R_X86_64_PC32_BND
)
4280 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4282 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4284 /* Symbol is referenced locally. Make sure it is
4285 defined locally or for a branch. */
4286 fail
= !h
->def_regular
&& !branch
;
4288 else if (!(info
->executable
4289 && (h
->needs_copy
|| eh
->needs_copy
)))
4291 /* Symbol doesn't need copy reloc and isn't referenced
4292 locally. We only allow branch to symbol with
4293 non-default visibility. */
4295 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4302 const char *pic
= "";
4304 switch (ELF_ST_VISIBILITY (h
->other
))
4307 v
= _("hidden symbol");
4310 v
= _("internal symbol");
4313 v
= _("protected symbol");
4317 pic
= _("; recompile with -fPIC");
4322 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4324 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4326 (*_bfd_error_handler
) (fmt
, input_bfd
,
4327 x86_64_elf_howto_table
[r_type
].name
,
4328 v
, h
->root
.root
.string
, pic
);
4329 bfd_set_error (bfd_error_bad_value
);
4340 /* FIXME: The ABI says the linker should make sure the value is
4341 the same when it's zeroextended to 64 bit. */
4344 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4347 /* Don't copy a pc-relative relocation into the output file
4348 if the symbol needs copy reloc or the symbol is undefined
4349 when building executable. */
4351 && !(info
->executable
4355 || h
->root
.type
== bfd_link_hash_undefined
)
4356 && IS_X86_64_PCREL_TYPE (r_type
))
4358 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4359 || h
->root
.type
!= bfd_link_hash_undefweak
)
4360 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4361 && r_type
!= R_X86_64_SIZE32
4362 && r_type
!= R_X86_64_SIZE64
)
4363 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4364 || (ELIMINATE_COPY_RELOCS
4371 || h
->root
.type
== bfd_link_hash_undefweak
4372 || h
->root
.type
== bfd_link_hash_undefined
)))
4374 Elf_Internal_Rela outrel
;
4375 bfd_boolean skip
, relocate
;
4378 /* When generating a shared object, these relocations
4379 are copied into the output file to be resolved at run
4385 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4387 if (outrel
.r_offset
== (bfd_vma
) -1)
4389 else if (outrel
.r_offset
== (bfd_vma
) -2)
4390 skip
= TRUE
, relocate
= TRUE
;
4392 outrel
.r_offset
+= (input_section
->output_section
->vma
4393 + input_section
->output_offset
);
4396 memset (&outrel
, 0, sizeof outrel
);
4398 /* h->dynindx may be -1 if this symbol was marked to
4402 && (IS_X86_64_PCREL_TYPE (r_type
)
4404 || ! SYMBOLIC_BIND (info
, h
)
4405 || ! h
->def_regular
))
4407 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4408 outrel
.r_addend
= rel
->r_addend
;
4412 /* This symbol is local, or marked to become local. */
4413 if (r_type
== htab
->pointer_r_type
)
4416 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4417 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4419 else if (r_type
== R_X86_64_64
4420 && !ABI_64_P (output_bfd
))
4423 outrel
.r_info
= htab
->r_info (0,
4424 R_X86_64_RELATIVE64
);
4425 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4426 /* Check addend overflow. */
4427 if ((outrel
.r_addend
& 0x80000000)
4428 != (rel
->r_addend
& 0x80000000))
4431 int addend
= rel
->r_addend
;
4432 if (h
&& h
->root
.root
.string
)
4433 name
= h
->root
.root
.string
;
4435 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4438 (*_bfd_error_handler
)
4439 (_("%B: addend -0x%x in relocation %s against "
4440 "symbol `%s' at 0x%lx in section `%A' is "
4442 input_bfd
, input_section
, addend
,
4443 x86_64_elf_howto_table
[r_type
].name
,
4444 name
, (unsigned long) rel
->r_offset
);
4446 (*_bfd_error_handler
)
4447 (_("%B: addend 0x%x in relocation %s against "
4448 "symbol `%s' at 0x%lx in section `%A' is "
4450 input_bfd
, input_section
, addend
,
4451 x86_64_elf_howto_table
[r_type
].name
,
4452 name
, (unsigned long) rel
->r_offset
);
4453 bfd_set_error (bfd_error_bad_value
);
4461 if (bfd_is_abs_section (sec
))
4463 else if (sec
== NULL
|| sec
->owner
== NULL
)
4465 bfd_set_error (bfd_error_bad_value
);
4472 /* We are turning this relocation into one
4473 against a section symbol. It would be
4474 proper to subtract the symbol's value,
4475 osec->vma, from the emitted reloc addend,
4476 but ld.so expects buggy relocs. */
4477 osec
= sec
->output_section
;
4478 sindx
= elf_section_data (osec
)->dynindx
;
4481 asection
*oi
= htab
->elf
.text_index_section
;
4482 sindx
= elf_section_data (oi
)->dynindx
;
4484 BFD_ASSERT (sindx
!= 0);
4487 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4488 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4492 sreloc
= elf_section_data (input_section
)->sreloc
;
4494 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4496 r
= bfd_reloc_notsupported
;
4497 goto check_relocation_error
;
4500 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4502 /* If this reloc is against an external symbol, we do
4503 not want to fiddle with the addend. Otherwise, we
4504 need to include the symbol value so that it becomes
4505 an addend for the dynamic reloc. */
4512 case R_X86_64_TLSGD
:
4513 case R_X86_64_GOTPC32_TLSDESC
:
4514 case R_X86_64_TLSDESC_CALL
:
4515 case R_X86_64_GOTTPOFF
:
4516 tls_type
= GOT_UNKNOWN
;
4517 if (h
== NULL
&& local_got_offsets
)
4518 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4520 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4522 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4523 input_section
, contents
,
4524 symtab_hdr
, sym_hashes
,
4525 &r_type
, tls_type
, rel
,
4526 relend
, h
, r_symndx
))
4529 if (r_type
== R_X86_64_TPOFF32
)
4531 bfd_vma roff
= rel
->r_offset
;
4533 BFD_ASSERT (! unresolved_reloc
);
4535 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4537 /* GD->LE transition. For 64bit, change
4538 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4539 .word 0x6666; rex64; call __tls_get_addr
4542 leaq foo@tpoff(%rax), %rax
4544 leaq foo@tlsgd(%rip), %rdi
4545 .word 0x6666; rex64; call __tls_get_addr
4548 leaq foo@tpoff(%rax), %rax
4549 For largepic, change:
4550 leaq foo@tlsgd(%rip), %rdi
4551 movabsq $__tls_get_addr@pltoff, %rax
4556 leaq foo@tpoff(%rax), %rax
4557 nopw 0x0(%rax,%rax,1) */
4559 if (ABI_64_P (output_bfd
)
4560 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4562 memcpy (contents
+ roff
- 3,
4563 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4564 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4567 else if (ABI_64_P (output_bfd
))
4568 memcpy (contents
+ roff
- 4,
4569 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4572 memcpy (contents
+ roff
- 3,
4573 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4575 bfd_put_32 (output_bfd
,
4576 elf_x86_64_tpoff (info
, relocation
),
4577 contents
+ roff
+ 8 + largepic
);
4578 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4582 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4584 /* GDesc -> LE transition.
4585 It's originally something like:
4586 leaq x@tlsdesc(%rip), %rax
4589 movl $x@tpoff, %rax. */
4591 unsigned int val
, type
;
4593 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4594 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4595 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4596 contents
+ roff
- 3);
4597 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4598 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4599 contents
+ roff
- 1);
4600 bfd_put_32 (output_bfd
,
4601 elf_x86_64_tpoff (info
, relocation
),
4605 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4607 /* GDesc -> LE transition.
4612 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4613 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4616 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4618 /* IE->LE transition:
4619 For 64bit, originally it can be one of:
4620 movq foo@gottpoff(%rip), %reg
4621 addq foo@gottpoff(%rip), %reg
4624 leaq foo(%reg), %reg
4626 For 32bit, originally it can be one of:
4627 movq foo@gottpoff(%rip), %reg
4628 addl foo@gottpoff(%rip), %reg
4631 leal foo(%reg), %reg
4634 unsigned int val
, type
, reg
;
4637 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4640 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4641 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4647 bfd_put_8 (output_bfd
, 0x49,
4648 contents
+ roff
- 3);
4649 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4650 bfd_put_8 (output_bfd
, 0x41,
4651 contents
+ roff
- 3);
4652 bfd_put_8 (output_bfd
, 0xc7,
4653 contents
+ roff
- 2);
4654 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4655 contents
+ roff
- 1);
4659 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4662 bfd_put_8 (output_bfd
, 0x49,
4663 contents
+ roff
- 3);
4664 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4665 bfd_put_8 (output_bfd
, 0x41,
4666 contents
+ roff
- 3);
4667 bfd_put_8 (output_bfd
, 0x81,
4668 contents
+ roff
- 2);
4669 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4670 contents
+ roff
- 1);
4674 /* addq/addl -> leaq/leal */
4676 bfd_put_8 (output_bfd
, 0x4d,
4677 contents
+ roff
- 3);
4678 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4679 bfd_put_8 (output_bfd
, 0x45,
4680 contents
+ roff
- 3);
4681 bfd_put_8 (output_bfd
, 0x8d,
4682 contents
+ roff
- 2);
4683 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4684 contents
+ roff
- 1);
4686 bfd_put_32 (output_bfd
,
4687 elf_x86_64_tpoff (info
, relocation
),
4695 if (htab
->elf
.sgot
== NULL
)
4700 off
= h
->got
.offset
;
4701 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4705 if (local_got_offsets
== NULL
)
4708 off
= local_got_offsets
[r_symndx
];
4709 offplt
= local_tlsdesc_gotents
[r_symndx
];
4716 Elf_Internal_Rela outrel
;
4720 if (htab
->elf
.srelgot
== NULL
)
4723 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4725 if (GOT_TLS_GDESC_P (tls_type
))
4727 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4728 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4729 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4730 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4731 + htab
->elf
.sgotplt
->output_offset
4733 + htab
->sgotplt_jump_table_size
);
4734 sreloc
= htab
->elf
.srelplt
;
4736 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4738 outrel
.r_addend
= 0;
4739 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4742 sreloc
= htab
->elf
.srelgot
;
4744 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4745 + htab
->elf
.sgot
->output_offset
+ off
);
4747 if (GOT_TLS_GD_P (tls_type
))
4748 dr_type
= R_X86_64_DTPMOD64
;
4749 else if (GOT_TLS_GDESC_P (tls_type
))
4752 dr_type
= R_X86_64_TPOFF64
;
4754 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4755 outrel
.r_addend
= 0;
4756 if ((dr_type
== R_X86_64_TPOFF64
4757 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4758 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4759 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4761 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4763 if (GOT_TLS_GD_P (tls_type
))
4767 BFD_ASSERT (! unresolved_reloc
);
4768 bfd_put_64 (output_bfd
,
4769 relocation
- elf_x86_64_dtpoff_base (info
),
4770 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4774 bfd_put_64 (output_bfd
, 0,
4775 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4776 outrel
.r_info
= htab
->r_info (indx
,
4778 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4779 elf_append_rela (output_bfd
, sreloc
,
4788 local_got_offsets
[r_symndx
] |= 1;
4791 if (off
>= (bfd_vma
) -2
4792 && ! GOT_TLS_GDESC_P (tls_type
))
4794 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4796 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4797 || r_type
== R_X86_64_TLSDESC_CALL
)
4798 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4799 + htab
->elf
.sgotplt
->output_offset
4800 + offplt
+ htab
->sgotplt_jump_table_size
;
4802 relocation
= htab
->elf
.sgot
->output_section
->vma
4803 + htab
->elf
.sgot
->output_offset
+ off
;
4804 unresolved_reloc
= FALSE
;
4808 bfd_vma roff
= rel
->r_offset
;
4810 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4812 /* GD->IE transition. For 64bit, change
4813 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4814 .word 0x6666; rex64; call __tls_get_addr@plt
4817 addq foo@gottpoff(%rip), %rax
4819 leaq foo@tlsgd(%rip), %rdi
4820 .word 0x6666; rex64; call __tls_get_addr@plt
4823 addq foo@gottpoff(%rip), %rax
4824 For largepic, change:
4825 leaq foo@tlsgd(%rip), %rdi
4826 movabsq $__tls_get_addr@pltoff, %rax
4831 addq foo@gottpoff(%rax), %rax
4832 nopw 0x0(%rax,%rax,1) */
4834 if (ABI_64_P (output_bfd
)
4835 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4837 memcpy (contents
+ roff
- 3,
4838 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4839 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4842 else if (ABI_64_P (output_bfd
))
4843 memcpy (contents
+ roff
- 4,
4844 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4847 memcpy (contents
+ roff
- 3,
4848 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4851 relocation
= (htab
->elf
.sgot
->output_section
->vma
4852 + htab
->elf
.sgot
->output_offset
+ off
4855 - input_section
->output_section
->vma
4856 - input_section
->output_offset
4858 bfd_put_32 (output_bfd
, relocation
,
4859 contents
+ roff
+ 8 + largepic
);
4860 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4864 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4866 /* GDesc -> IE transition.
4867 It's originally something like:
4868 leaq x@tlsdesc(%rip), %rax
4871 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4873 /* Now modify the instruction as appropriate. To
4874 turn a leaq into a movq in the form we use it, it
4875 suffices to change the second byte from 0x8d to
4877 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4879 bfd_put_32 (output_bfd
,
4880 htab
->elf
.sgot
->output_section
->vma
4881 + htab
->elf
.sgot
->output_offset
+ off
4883 - input_section
->output_section
->vma
4884 - input_section
->output_offset
4889 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4891 /* GDesc -> IE transition.
4898 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4899 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4907 case R_X86_64_TLSLD
:
4908 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4909 input_section
, contents
,
4910 symtab_hdr
, sym_hashes
,
4911 &r_type
, GOT_UNKNOWN
,
4912 rel
, relend
, h
, r_symndx
))
4915 if (r_type
!= R_X86_64_TLSLD
)
4917 /* LD->LE transition:
4918 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4919 For 64bit, we change it into:
4920 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4921 For 32bit, we change it into:
4922 nopl 0x0(%rax); movl %fs:0, %eax.
4923 For largepic, change:
4924 leaq foo@tlsgd(%rip), %rdi
4925 movabsq $__tls_get_addr@pltoff, %rax
4929 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4932 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
4933 if (ABI_64_P (output_bfd
)
4934 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
4935 memcpy (contents
+ rel
->r_offset
- 3,
4936 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4937 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4938 else if (ABI_64_P (output_bfd
))
4939 memcpy (contents
+ rel
->r_offset
- 3,
4940 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4942 memcpy (contents
+ rel
->r_offset
- 3,
4943 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4944 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4949 if (htab
->elf
.sgot
== NULL
)
4952 off
= htab
->tls_ld_got
.offset
;
4957 Elf_Internal_Rela outrel
;
4959 if (htab
->elf
.srelgot
== NULL
)
4962 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4963 + htab
->elf
.sgot
->output_offset
+ off
);
4965 bfd_put_64 (output_bfd
, 0,
4966 htab
->elf
.sgot
->contents
+ off
);
4967 bfd_put_64 (output_bfd
, 0,
4968 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4969 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
4970 outrel
.r_addend
= 0;
4971 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
4973 htab
->tls_ld_got
.offset
|= 1;
4975 relocation
= htab
->elf
.sgot
->output_section
->vma
4976 + htab
->elf
.sgot
->output_offset
+ off
;
4977 unresolved_reloc
= FALSE
;
4980 case R_X86_64_DTPOFF32
:
4981 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
4982 relocation
-= elf_x86_64_dtpoff_base (info
);
4984 relocation
= elf_x86_64_tpoff (info
, relocation
);
4987 case R_X86_64_TPOFF32
:
4988 case R_X86_64_TPOFF64
:
4989 BFD_ASSERT (info
->executable
);
4990 relocation
= elf_x86_64_tpoff (info
, relocation
);
4993 case R_X86_64_DTPOFF64
:
4994 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
4995 relocation
-= elf_x86_64_dtpoff_base (info
);
5002 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5003 because such sections are not SEC_ALLOC and thus ld.so will
5004 not process them. */
5005 if (unresolved_reloc
5006 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5008 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5009 rel
->r_offset
) != (bfd_vma
) -1)
5011 (*_bfd_error_handler
)
5012 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5015 (long) rel
->r_offset
,
5017 h
->root
.root
.string
);
5022 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5023 contents
, rel
->r_offset
,
5024 relocation
, rel
->r_addend
);
5026 check_relocation_error
:
5027 if (r
!= bfd_reloc_ok
)
5032 name
= h
->root
.root
.string
;
5035 name
= bfd_elf_string_from_elf_section (input_bfd
,
5036 symtab_hdr
->sh_link
,
5041 name
= bfd_section_name (input_bfd
, sec
);
5044 if (r
== bfd_reloc_overflow
)
5046 if (! ((*info
->callbacks
->reloc_overflow
)
5047 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5048 (bfd_vma
) 0, input_bfd
, input_section
,
5054 (*_bfd_error_handler
)
5055 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5056 input_bfd
, input_section
,
5057 (long) rel
->r_offset
, name
, (int) r
);
5066 /* Finish up dynamic symbol handling. We set the contents of various
5067 dynamic sections here. */
5070 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5071 struct bfd_link_info
*info
,
5072 struct elf_link_hash_entry
*h
,
5073 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5075 struct elf_x86_64_link_hash_table
*htab
;
5076 const struct elf_x86_64_backend_data
*abed
;
5077 bfd_boolean use_plt_bnd
;
5078 struct elf_x86_64_link_hash_entry
*eh
;
5080 htab
= elf_x86_64_hash_table (info
);
5084 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5085 section only if there is .plt section. */
5086 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5088 ? &elf_x86_64_bnd_arch_bed
5089 : get_elf_x86_64_backend_data (output_bfd
));
5091 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5093 if (h
->plt
.offset
!= (bfd_vma
) -1)
5096 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5097 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5098 Elf_Internal_Rela rela
;
5100 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5101 const struct elf_backend_data
*bed
;
5102 bfd_vma plt_got_pcrel_offset
;
5104 /* When building a static executable, use .iplt, .igot.plt and
5105 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5106 if (htab
->elf
.splt
!= NULL
)
5108 plt
= htab
->elf
.splt
;
5109 gotplt
= htab
->elf
.sgotplt
;
5110 relplt
= htab
->elf
.srelplt
;
5114 plt
= htab
->elf
.iplt
;
5115 gotplt
= htab
->elf
.igotplt
;
5116 relplt
= htab
->elf
.irelplt
;
5119 /* This symbol has an entry in the procedure linkage table. Set
5121 if ((h
->dynindx
== -1
5122 && !((h
->forced_local
|| info
->executable
)
5124 && h
->type
== STT_GNU_IFUNC
))
5130 /* Get the index in the procedure linkage table which
5131 corresponds to this symbol. This is the index of this symbol
5132 in all the symbols for which we are making plt entries. The
5133 first entry in the procedure linkage table is reserved.
5135 Get the offset into the .got table of the entry that
5136 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5137 bytes. The first three are reserved for the dynamic linker.
5139 For static executables, we don't reserve anything. */
5141 if (plt
== htab
->elf
.splt
)
5143 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5144 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5148 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5149 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5152 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5153 plt_plt_offset
= abed
->plt_plt_offset
;
5154 plt_got_insn_size
= abed
->plt_got_insn_size
;
5155 plt_got_offset
= abed
->plt_got_offset
;
5158 /* Use the second PLT with BND relocations. */
5159 const bfd_byte
*plt_entry
, *plt2_entry
;
5161 if (eh
->has_bnd_reloc
)
5163 plt_entry
= elf_x86_64_bnd_plt_entry
;
5164 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5168 plt_entry
= elf_x86_64_legacy_plt_entry
;
5169 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5171 /* Subtract 1 since there is no BND prefix. */
5172 plt_plt_insn_end
-= 1;
5173 plt_plt_offset
-= 1;
5174 plt_got_insn_size
-= 1;
5175 plt_got_offset
-= 1;
5178 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5179 == sizeof (elf_x86_64_legacy_plt_entry
));
5181 /* Fill in the entry in the procedure linkage table. */
5182 memcpy (plt
->contents
+ h
->plt
.offset
,
5183 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5184 /* Fill in the entry in the second PLT. */
5185 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5186 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5188 resolved_plt
= htab
->plt_bnd
;
5189 plt_offset
= eh
->plt_bnd
.offset
;
5193 /* Fill in the entry in the procedure linkage table. */
5194 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5195 abed
->plt_entry_size
);
5198 plt_offset
= h
->plt
.offset
;
5201 /* Insert the relocation positions of the plt section. */
5203 /* Put offset the PC-relative instruction referring to the GOT entry,
5204 subtracting the size of that instruction. */
5205 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5206 + gotplt
->output_offset
5208 - resolved_plt
->output_section
->vma
5209 - resolved_plt
->output_offset
5211 - plt_got_insn_size
);
5213 /* Check PC-relative offset overflow in PLT entry. */
5214 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5215 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5216 output_bfd
, h
->root
.root
.string
);
5218 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5219 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5221 /* Fill in the entry in the global offset table, initially this
5222 points to the second part of the PLT entry. */
5223 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5224 + plt
->output_offset
5225 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5226 gotplt
->contents
+ got_offset
);
5228 /* Fill in the entry in the .rela.plt section. */
5229 rela
.r_offset
= (gotplt
->output_section
->vma
5230 + gotplt
->output_offset
5232 if (h
->dynindx
== -1
5233 || ((info
->executable
5234 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5236 && h
->type
== STT_GNU_IFUNC
))
5238 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5239 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5240 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5241 rela
.r_addend
= (h
->root
.u
.def
.value
5242 + h
->root
.u
.def
.section
->output_section
->vma
5243 + h
->root
.u
.def
.section
->output_offset
);
5244 /* R_X86_64_IRELATIVE comes last. */
5245 plt_index
= htab
->next_irelative_index
--;
5249 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5251 plt_index
= htab
->next_jump_slot_index
++;
5254 /* Don't fill PLT entry for static executables. */
5255 if (plt
== htab
->elf
.splt
)
5257 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5259 /* Put relocation index. */
5260 bfd_put_32 (output_bfd
, plt_index
,
5261 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5263 /* Put offset for jmp .PLT0 and check for overflow. We don't
5264 check relocation index for overflow since branch displacement
5265 will overflow first. */
5266 if (plt0_offset
> 0x80000000)
5267 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5268 output_bfd
, h
->root
.root
.string
);
5269 bfd_put_32 (output_bfd
, - plt0_offset
,
5270 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5273 bed
= get_elf_backend_data (output_bfd
);
5274 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5275 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5277 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5279 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5280 asection
*plt
, *got
;
5281 bfd_boolean got_after_plt
;
5282 int32_t got_pcrel_offset
;
5283 const bfd_byte
*got_plt_entry
;
5285 /* Set the entry in the GOT procedure linkage table. */
5286 plt
= htab
->plt_got
;
5287 got
= htab
->elf
.sgot
;
5288 got_offset
= h
->got
.offset
;
5290 if (got_offset
== (bfd_vma
) -1
5291 || h
->type
== STT_GNU_IFUNC
5296 /* Use the second PLT entry template for the GOT PLT since they
5297 are the identical. */
5298 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5299 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5300 if (eh
->has_bnd_reloc
)
5301 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5304 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5306 /* Subtract 1 since there is no BND prefix. */
5307 plt_got_insn_size
-= 1;
5308 plt_got_offset
-= 1;
5311 /* Fill in the entry in the GOT procedure linkage table. */
5312 plt_offset
= eh
->plt_got
.offset
;
5313 memcpy (plt
->contents
+ plt_offset
,
5314 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5316 /* Put offset the PC-relative instruction referring to the GOT
5317 entry, subtracting the size of that instruction. */
5318 got_pcrel_offset
= (got
->output_section
->vma
5319 + got
->output_offset
5321 - plt
->output_section
->vma
5322 - plt
->output_offset
5324 - plt_got_insn_size
);
5326 /* Check PC-relative offset overflow in GOT PLT entry. */
5327 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5328 if ((got_after_plt
&& got_pcrel_offset
< 0)
5329 || (!got_after_plt
&& got_pcrel_offset
> 0))
5330 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5331 output_bfd
, h
->root
.root
.string
);
5333 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5334 plt
->contents
+ plt_offset
+ plt_got_offset
);
5338 && (h
->plt
.offset
!= (bfd_vma
) -1
5339 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5341 /* Mark the symbol as undefined, rather than as defined in
5342 the .plt section. Leave the value if there were any
5343 relocations where pointer equality matters (this is a clue
5344 for the dynamic linker, to make function pointer
5345 comparisons work between an application and shared
5346 library), otherwise set it to zero. If a function is only
5347 called from a binary, there is no need to slow down
5348 shared libraries because of that. */
5349 sym
->st_shndx
= SHN_UNDEF
;
5350 if (!h
->pointer_equality_needed
)
5354 if (h
->got
.offset
!= (bfd_vma
) -1
5355 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5356 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5358 Elf_Internal_Rela rela
;
5360 /* This symbol has an entry in the global offset table. Set it
5362 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5365 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5366 + htab
->elf
.sgot
->output_offset
5367 + (h
->got
.offset
&~ (bfd_vma
) 1));
5369 /* If this is a static link, or it is a -Bsymbolic link and the
5370 symbol is defined locally or was forced to be local because
5371 of a version file, we just want to emit a RELATIVE reloc.
5372 The entry in the global offset table will already have been
5373 initialized in the relocate_section function. */
5375 && h
->type
== STT_GNU_IFUNC
)
5379 /* Generate R_X86_64_GLOB_DAT. */
5386 if (!h
->pointer_equality_needed
)
5389 /* For non-shared object, we can't use .got.plt, which
5390 contains the real function addres if we need pointer
5391 equality. We load the GOT entry with the PLT entry. */
5392 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5393 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5394 + plt
->output_offset
5396 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5400 else if (info
->shared
5401 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5403 if (!h
->def_regular
)
5405 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5406 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5407 rela
.r_addend
= (h
->root
.u
.def
.value
5408 + h
->root
.u
.def
.section
->output_section
->vma
5409 + h
->root
.u
.def
.section
->output_offset
);
5413 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5415 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5416 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5417 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5421 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5426 Elf_Internal_Rela rela
;
5428 /* This symbol needs a copy reloc. Set it up. */
5430 if (h
->dynindx
== -1
5431 || (h
->root
.type
!= bfd_link_hash_defined
5432 && h
->root
.type
!= bfd_link_hash_defweak
)
5433 || htab
->srelbss
== NULL
)
5436 rela
.r_offset
= (h
->root
.u
.def
.value
5437 + h
->root
.u
.def
.section
->output_section
->vma
5438 + h
->root
.u
.def
.section
->output_offset
);
5439 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5441 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5447 /* Finish up local dynamic symbol handling. We set the contents of
5448 various dynamic sections here. */
5451 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5453 struct elf_link_hash_entry
*h
5454 = (struct elf_link_hash_entry
*) *slot
;
5455 struct bfd_link_info
*info
5456 = (struct bfd_link_info
*) inf
;
5458 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5462 /* Used to decide how to sort relocs in an optimal manner for the
5463 dynamic linker, before writing them out. */
5465 static enum elf_reloc_type_class
5466 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5467 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5468 const Elf_Internal_Rela
*rela
)
5470 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5472 case R_X86_64_RELATIVE
:
5473 case R_X86_64_RELATIVE64
:
5474 return reloc_class_relative
;
5475 case R_X86_64_JUMP_SLOT
:
5476 return reloc_class_plt
;
5478 return reloc_class_copy
;
5480 return reloc_class_normal
;
5484 /* Finish up the dynamic sections. */
5487 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5488 struct bfd_link_info
*info
)
5490 struct elf_x86_64_link_hash_table
*htab
;
5493 const struct elf_x86_64_backend_data
*abed
;
5495 htab
= elf_x86_64_hash_table (info
);
5499 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5500 section only if there is .plt section. */
5501 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5502 ? &elf_x86_64_bnd_arch_bed
5503 : get_elf_x86_64_backend_data (output_bfd
));
5505 dynobj
= htab
->elf
.dynobj
;
5506 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5508 if (htab
->elf
.dynamic_sections_created
)
5510 bfd_byte
*dyncon
, *dynconend
;
5511 const struct elf_backend_data
*bed
;
5512 bfd_size_type sizeof_dyn
;
5514 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5517 bed
= get_elf_backend_data (dynobj
);
5518 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5519 dyncon
= sdyn
->contents
;
5520 dynconend
= sdyn
->contents
+ sdyn
->size
;
5521 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5523 Elf_Internal_Dyn dyn
;
5526 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5534 s
= htab
->elf
.sgotplt
;
5535 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5539 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5543 s
= htab
->elf
.srelplt
->output_section
;
5544 dyn
.d_un
.d_val
= s
->size
;
5548 /* The procedure linkage table relocs (DT_JMPREL) should
5549 not be included in the overall relocs (DT_RELA).
5550 Therefore, we override the DT_RELASZ entry here to
5551 make it not include the JMPREL relocs. Since the
5552 linker script arranges for .rela.plt to follow all
5553 other relocation sections, we don't have to worry
5554 about changing the DT_RELA entry. */
5555 if (htab
->elf
.srelplt
!= NULL
)
5557 s
= htab
->elf
.srelplt
->output_section
;
5558 dyn
.d_un
.d_val
-= s
->size
;
5562 case DT_TLSDESC_PLT
:
5564 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5565 + htab
->tlsdesc_plt
;
5568 case DT_TLSDESC_GOT
:
5570 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5571 + htab
->tlsdesc_got
;
5575 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5578 /* Fill in the special first entry in the procedure linkage table. */
5579 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5581 /* Fill in the first entry in the procedure linkage table. */
5582 memcpy (htab
->elf
.splt
->contents
,
5583 abed
->plt0_entry
, abed
->plt_entry_size
);
5584 /* Add offset for pushq GOT+8(%rip), since the instruction
5585 uses 6 bytes subtract this value. */
5586 bfd_put_32 (output_bfd
,
5587 (htab
->elf
.sgotplt
->output_section
->vma
5588 + htab
->elf
.sgotplt
->output_offset
5590 - htab
->elf
.splt
->output_section
->vma
5591 - htab
->elf
.splt
->output_offset
5593 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5594 /* Add offset for the PC-relative instruction accessing GOT+16,
5595 subtracting the offset to the end of that instruction. */
5596 bfd_put_32 (output_bfd
,
5597 (htab
->elf
.sgotplt
->output_section
->vma
5598 + htab
->elf
.sgotplt
->output_offset
5600 - htab
->elf
.splt
->output_section
->vma
5601 - htab
->elf
.splt
->output_offset
5602 - abed
->plt0_got2_insn_end
),
5603 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5605 elf_section_data (htab
->elf
.splt
->output_section
)
5606 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5608 if (htab
->tlsdesc_plt
)
5610 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5611 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5613 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5614 abed
->plt0_entry
, abed
->plt_entry_size
);
5616 /* Add offset for pushq GOT+8(%rip), since the
5617 instruction uses 6 bytes subtract this value. */
5618 bfd_put_32 (output_bfd
,
5619 (htab
->elf
.sgotplt
->output_section
->vma
5620 + htab
->elf
.sgotplt
->output_offset
5622 - htab
->elf
.splt
->output_section
->vma
5623 - htab
->elf
.splt
->output_offset
5626 htab
->elf
.splt
->contents
5627 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5628 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5629 where TGD stands for htab->tlsdesc_got, subtracting the offset
5630 to the end of that instruction. */
5631 bfd_put_32 (output_bfd
,
5632 (htab
->elf
.sgot
->output_section
->vma
5633 + htab
->elf
.sgot
->output_offset
5635 - htab
->elf
.splt
->output_section
->vma
5636 - htab
->elf
.splt
->output_offset
5638 - abed
->plt0_got2_insn_end
),
5639 htab
->elf
.splt
->contents
5640 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5645 if (htab
->plt_bnd
!= NULL
)
5646 elf_section_data (htab
->plt_bnd
->output_section
)
5647 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5649 if (htab
->elf
.sgotplt
)
5651 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5653 (*_bfd_error_handler
)
5654 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5658 /* Fill in the first three entries in the global offset table. */
5659 if (htab
->elf
.sgotplt
->size
> 0)
5661 /* Set the first entry in the global offset table to the address of
5662 the dynamic section. */
5664 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5666 bfd_put_64 (output_bfd
,
5667 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5668 htab
->elf
.sgotplt
->contents
);
5669 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5670 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5671 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5674 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5678 /* Adjust .eh_frame for .plt section. */
5679 if (htab
->plt_eh_frame
!= NULL
5680 && htab
->plt_eh_frame
->contents
!= NULL
)
5682 if (htab
->elf
.splt
!= NULL
5683 && htab
->elf
.splt
->size
!= 0
5684 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5685 && htab
->elf
.splt
->output_section
!= NULL
5686 && htab
->plt_eh_frame
->output_section
!= NULL
)
5688 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5689 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5690 + htab
->plt_eh_frame
->output_offset
5691 + PLT_FDE_START_OFFSET
;
5692 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5693 htab
->plt_eh_frame
->contents
5694 + PLT_FDE_START_OFFSET
);
5696 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5698 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5700 htab
->plt_eh_frame
->contents
))
5705 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5706 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5709 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5710 htab_traverse (htab
->loc_hash_table
,
5711 elf_x86_64_finish_local_dynamic_symbol
,
5717 /* Return an array of PLT entry symbol values. */
5720 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
5723 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5726 bfd_vma
*plt_sym_val
;
5728 bfd_byte
*plt_contents
;
5729 const struct elf_x86_64_backend_data
*bed
;
5730 Elf_Internal_Shdr
*hdr
;
5733 /* Get the .plt section contents. PLT passed down may point to the
5734 .plt.bnd section. Make sure that PLT always points to the .plt
5736 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5741 plt
= bfd_get_section_by_name (abfd
, ".plt");
5744 bed
= &elf_x86_64_bnd_arch_bed
;
5747 bed
= get_elf_x86_64_backend_data (abfd
);
5749 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
5750 if (plt_contents
== NULL
)
5752 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5753 plt_contents
, 0, plt
->size
))
5756 free (plt_contents
);
5760 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
5761 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
5764 hdr
= &elf_section_data (relplt
)->this_hdr
;
5765 count
= relplt
->size
/ hdr
->sh_entsize
;
5767 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
5768 if (plt_sym_val
== NULL
)
5771 for (i
= 0; i
< count
; i
++)
5772 plt_sym_val
[i
] = -1;
5774 plt_offset
= bed
->plt_entry_size
;
5775 p
= relplt
->relocation
;
5776 for (i
= 0; i
< count
; i
++, p
++)
5780 /* Skip unknown relocation. */
5781 if (p
->howto
== NULL
)
5784 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
5785 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
5788 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
5789 + bed
->plt_reloc_offset
));
5790 if (reloc_index
>= count
)
5794 /* This is the index in .plt section. */
5795 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
5796 /* Store VMA + the offset in .plt.bnd section. */
5797 plt_sym_val
[reloc_index
] =
5799 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
5802 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
5803 plt_offset
+= bed
->plt_entry_size
;
5805 /* PR binutils/18437: Skip extra relocations in the .rela.plt
5807 if (plt_offset
>= plt
->size
)
5811 free (plt_contents
);
5816 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5820 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
5827 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5828 as PLT if it exists. */
5829 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5831 plt
= bfd_get_section_by_name (abfd
, ".plt");
5832 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
5833 dynsymcount
, dynsyms
, ret
,
5835 elf_x86_64_get_plt_sym_val
);
5838 /* Handle an x86-64 specific section when reading an object file. This
5839 is called when elfcode.h finds a section with an unknown type. */
5842 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
5843 const char *name
, int shindex
)
5845 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
5848 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
5854 /* Hook called by the linker routine which adds symbols from an object
5855 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5859 elf_x86_64_add_symbol_hook (bfd
*abfd
,
5860 struct bfd_link_info
*info
,
5861 Elf_Internal_Sym
*sym
,
5862 const char **namep ATTRIBUTE_UNUSED
,
5863 flagword
*flagsp ATTRIBUTE_UNUSED
,
5869 switch (sym
->st_shndx
)
5871 case SHN_X86_64_LCOMMON
:
5872 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
5875 lcomm
= bfd_make_section_with_flags (abfd
,
5879 | SEC_LINKER_CREATED
));
5882 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
5885 *valp
= sym
->st_size
;
5889 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
5890 && (abfd
->flags
& DYNAMIC
) == 0
5891 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
5892 elf_tdata (info
->output_bfd
)->has_gnu_symbols
5893 |= elf_gnu_symbol_unique
;
5899 /* Given a BFD section, try to locate the corresponding ELF section
5903 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
5904 asection
*sec
, int *index_return
)
5906 if (sec
== &_bfd_elf_large_com_section
)
5908 *index_return
= SHN_X86_64_LCOMMON
;
5914 /* Process a symbol. */
5917 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
5920 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
5922 switch (elfsym
->internal_elf_sym
.st_shndx
)
5924 case SHN_X86_64_LCOMMON
:
5925 asym
->section
= &_bfd_elf_large_com_section
;
5926 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
5927 /* Common symbol doesn't set BSF_GLOBAL. */
5928 asym
->flags
&= ~BSF_GLOBAL
;
5934 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
5936 return (sym
->st_shndx
== SHN_COMMON
5937 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
5941 elf_x86_64_common_section_index (asection
*sec
)
5943 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5946 return SHN_X86_64_LCOMMON
;
5950 elf_x86_64_common_section (asection
*sec
)
5952 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5953 return bfd_com_section_ptr
;
5955 return &_bfd_elf_large_com_section
;
5959 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
5960 const Elf_Internal_Sym
*sym
,
5965 const asection
*oldsec
)
5967 /* A normal common symbol and a large common symbol result in a
5968 normal common symbol. We turn the large common symbol into a
5971 && h
->root
.type
== bfd_link_hash_common
5973 && bfd_is_com_section (*psec
)
5976 if (sym
->st_shndx
== SHN_COMMON
5977 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
5979 h
->root
.u
.c
.p
->section
5980 = bfd_make_section_old_way (oldbfd
, "COMMON");
5981 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
5983 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
5984 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
5985 *psec
= bfd_com_section_ptr
;
5992 elf_x86_64_additional_program_headers (bfd
*abfd
,
5993 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
5998 /* Check to see if we need a large readonly segment. */
5999 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6000 if (s
&& (s
->flags
& SEC_LOAD
))
6003 /* Check to see if we need a large data segment. Since .lbss sections
6004 is placed right after the .bss section, there should be no need for
6005 a large data segment just because of .lbss. */
6006 s
= bfd_get_section_by_name (abfd
, ".ldata");
6007 if (s
&& (s
->flags
& SEC_LOAD
))
6013 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6016 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6018 if (h
->plt
.offset
!= (bfd_vma
) -1
6020 && !h
->pointer_equality_needed
)
6023 return _bfd_elf_hash_symbol (h
);
6026 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6029 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6030 const bfd_target
*output
)
6032 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6033 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6034 && _bfd_elf_relocs_compatible (input
, output
));
6037 static const struct bfd_elf_special_section
6038 elf_x86_64_special_sections
[]=
6040 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6041 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6042 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6043 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6044 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6045 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6046 { NULL
, 0, 0, 0, 0 }
6049 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6050 #define TARGET_LITTLE_NAME "elf64-x86-64"
6051 #define ELF_ARCH bfd_arch_i386
6052 #define ELF_TARGET_ID X86_64_ELF_DATA
6053 #define ELF_MACHINE_CODE EM_X86_64
6054 #define ELF_MAXPAGESIZE 0x200000
6055 #define ELF_MINPAGESIZE 0x1000
6056 #define ELF_COMMONPAGESIZE 0x1000
6058 #define elf_backend_can_gc_sections 1
6059 #define elf_backend_can_refcount 1
6060 #define elf_backend_want_got_plt 1
6061 #define elf_backend_plt_readonly 1
6062 #define elf_backend_want_plt_sym 0
6063 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6064 #define elf_backend_rela_normal 1
6065 #define elf_backend_plt_alignment 4
6066 #define elf_backend_extern_protected_data 1
6068 #define elf_info_to_howto elf_x86_64_info_to_howto
6070 #define bfd_elf64_bfd_link_hash_table_create \
6071 elf_x86_64_link_hash_table_create
6072 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6073 #define bfd_elf64_bfd_reloc_name_lookup \
6074 elf_x86_64_reloc_name_lookup
6076 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6077 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6078 #define elf_backend_check_relocs elf_x86_64_check_relocs
6079 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6080 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6081 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6082 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6083 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6084 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6085 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6086 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6088 #define elf_backend_write_core_note elf_x86_64_write_core_note
6090 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6091 #define elf_backend_relocate_section elf_x86_64_relocate_section
6092 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6093 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6094 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6095 #define elf_backend_object_p elf64_x86_64_elf_object_p
6096 #define bfd_elf64_mkobject elf_x86_64_mkobject
6097 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6099 #define elf_backend_section_from_shdr \
6100 elf_x86_64_section_from_shdr
6102 #define elf_backend_section_from_bfd_section \
6103 elf_x86_64_elf_section_from_bfd_section
6104 #define elf_backend_add_symbol_hook \
6105 elf_x86_64_add_symbol_hook
6106 #define elf_backend_symbol_processing \
6107 elf_x86_64_symbol_processing
6108 #define elf_backend_common_section_index \
6109 elf_x86_64_common_section_index
6110 #define elf_backend_common_section \
6111 elf_x86_64_common_section
6112 #define elf_backend_common_definition \
6113 elf_x86_64_common_definition
6114 #define elf_backend_merge_symbol \
6115 elf_x86_64_merge_symbol
6116 #define elf_backend_special_sections \
6117 elf_x86_64_special_sections
6118 #define elf_backend_additional_program_headers \
6119 elf_x86_64_additional_program_headers
6120 #define elf_backend_hash_symbol \
6121 elf_x86_64_hash_symbol
6123 #include "elf64-target.h"
6125 /* CloudABI support. */
6127 #undef TARGET_LITTLE_SYM
6128 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6129 #undef TARGET_LITTLE_NAME
6130 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6133 #define ELF_OSABI ELFOSABI_CLOUDABI
6136 #define elf64_bed elf64_x86_64_cloudabi_bed
6138 #include "elf64-target.h"
6140 /* FreeBSD support. */
6142 #undef TARGET_LITTLE_SYM
6143 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6144 #undef TARGET_LITTLE_NAME
6145 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6148 #define ELF_OSABI ELFOSABI_FREEBSD
6151 #define elf64_bed elf64_x86_64_fbsd_bed
6153 #include "elf64-target.h"
6155 /* Solaris 2 support. */
6157 #undef TARGET_LITTLE_SYM
6158 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6159 #undef TARGET_LITTLE_NAME
6160 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6162 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6163 objects won't be recognized. */
6167 #define elf64_bed elf64_x86_64_sol2_bed
6169 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6171 #undef elf_backend_static_tls_alignment
6172 #define elf_backend_static_tls_alignment 16
6174 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6176 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6178 #undef elf_backend_want_plt_sym
6179 #define elf_backend_want_plt_sym 1
6181 #include "elf64-target.h"
6183 /* Native Client support. */
6186 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6188 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6189 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6193 #undef TARGET_LITTLE_SYM
6194 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6195 #undef TARGET_LITTLE_NAME
6196 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6198 #define elf64_bed elf64_x86_64_nacl_bed
6200 #undef ELF_MAXPAGESIZE
6201 #undef ELF_MINPAGESIZE
6202 #undef ELF_COMMONPAGESIZE
6203 #define ELF_MAXPAGESIZE 0x10000
6204 #define ELF_MINPAGESIZE 0x10000
6205 #define ELF_COMMONPAGESIZE 0x10000
6207 /* Restore defaults. */
6209 #undef elf_backend_static_tls_alignment
6210 #undef elf_backend_want_plt_sym
6211 #define elf_backend_want_plt_sym 0
6213 /* NaCl uses substantially different PLT entries for the same effects. */
6215 #undef elf_backend_plt_alignment
6216 #define elf_backend_plt_alignment 5
6217 #define NACL_PLT_ENTRY_SIZE 64
6218 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6220 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6222 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6223 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6224 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6225 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6226 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6228 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6229 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6231 /* 32 bytes of nop to pad out to the standard size. */
6232 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6233 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6234 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6235 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6236 0x66, /* excess data32 prefix */
6240 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6242 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6243 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6244 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6245 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6247 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6248 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6249 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6251 /* Lazy GOT entries point here (32-byte aligned). */
6252 0x68, /* pushq immediate */
6253 0, 0, 0, 0, /* replaced with index into relocation table. */
6254 0xe9, /* jmp relative */
6255 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6257 /* 22 bytes of nop to pad out to the standard size. */
6258 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6259 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6260 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6263 /* .eh_frame covering the .plt section. */
6265 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6267 #if (PLT_CIE_LENGTH != 20 \
6268 || PLT_FDE_LENGTH != 36 \
6269 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6270 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6271 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6273 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6274 0, 0, 0, 0, /* CIE ID */
6275 1, /* CIE version */
6276 'z', 'R', 0, /* Augmentation string */
6277 1, /* Code alignment factor */
6278 0x78, /* Data alignment factor */
6279 16, /* Return address column */
6280 1, /* Augmentation size */
6281 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6282 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6283 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6284 DW_CFA_nop
, DW_CFA_nop
,
6286 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6287 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6288 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6289 0, 0, 0, 0, /* .plt size goes here */
6290 0, /* Augmentation size */
6291 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6292 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6293 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6294 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6295 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6296 13, /* Block length */
6297 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6298 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6299 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6300 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6301 DW_CFA_nop
, DW_CFA_nop
6304 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6306 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6307 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6308 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6309 2, /* plt0_got1_offset */
6310 9, /* plt0_got2_offset */
6311 13, /* plt0_got2_insn_end */
6312 3, /* plt_got_offset */
6313 33, /* plt_reloc_offset */
6314 38, /* plt_plt_offset */
6315 7, /* plt_got_insn_size */
6316 42, /* plt_plt_insn_end */
6317 32, /* plt_lazy_offset */
6318 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6319 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6322 #undef elf_backend_arch_data
6323 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6325 #undef elf_backend_object_p
6326 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6327 #undef elf_backend_modify_segment_map
6328 #define elf_backend_modify_segment_map nacl_modify_segment_map
6329 #undef elf_backend_modify_program_headers
6330 #define elf_backend_modify_program_headers nacl_modify_program_headers
6331 #undef elf_backend_final_write_processing
6332 #define elf_backend_final_write_processing nacl_final_write_processing
6334 #include "elf64-target.h"
6336 /* Native Client x32 support. */
6339 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6341 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6342 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6346 #undef TARGET_LITTLE_SYM
6347 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6348 #undef TARGET_LITTLE_NAME
6349 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6351 #define elf32_bed elf32_x86_64_nacl_bed
6353 #define bfd_elf32_bfd_link_hash_table_create \
6354 elf_x86_64_link_hash_table_create
6355 #define bfd_elf32_bfd_reloc_type_lookup \
6356 elf_x86_64_reloc_type_lookup
6357 #define bfd_elf32_bfd_reloc_name_lookup \
6358 elf_x86_64_reloc_name_lookup
6359 #define bfd_elf32_mkobject \
6361 #define bfd_elf32_get_synthetic_symtab \
6362 elf_x86_64_get_synthetic_symtab
6364 #undef elf_backend_object_p
6365 #define elf_backend_object_p \
6366 elf32_x86_64_nacl_elf_object_p
6368 #undef elf_backend_bfd_from_remote_memory
6369 #define elf_backend_bfd_from_remote_memory \
6370 _bfd_elf32_bfd_from_remote_memory
6372 #undef elf_backend_size_info
6373 #define elf_backend_size_info \
6374 _bfd_elf32_size_info
6376 #include "elf32-target.h"
6378 /* Restore defaults. */
6379 #undef elf_backend_object_p
6380 #define elf_backend_object_p elf64_x86_64_elf_object_p
6381 #undef elf_backend_bfd_from_remote_memory
6382 #undef elf_backend_size_info
6383 #undef elf_backend_modify_segment_map
6384 #undef elf_backend_modify_program_headers
6385 #undef elf_backend_final_write_processing
6387 /* Intel L1OM support. */
6390 elf64_l1om_elf_object_p (bfd
*abfd
)
6392 /* Set the right machine number for an L1OM elf64 file. */
6393 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6397 #undef TARGET_LITTLE_SYM
6398 #define TARGET_LITTLE_SYM l1om_elf64_vec
6399 #undef TARGET_LITTLE_NAME
6400 #define TARGET_LITTLE_NAME "elf64-l1om"
6402 #define ELF_ARCH bfd_arch_l1om
6404 #undef ELF_MACHINE_CODE
6405 #define ELF_MACHINE_CODE EM_L1OM
6410 #define elf64_bed elf64_l1om_bed
6412 #undef elf_backend_object_p
6413 #define elf_backend_object_p elf64_l1om_elf_object_p
6415 /* Restore defaults. */
6416 #undef ELF_MAXPAGESIZE
6417 #undef ELF_MINPAGESIZE
6418 #undef ELF_COMMONPAGESIZE
6419 #define ELF_MAXPAGESIZE 0x200000
6420 #define ELF_MINPAGESIZE 0x1000
6421 #define ELF_COMMONPAGESIZE 0x1000
6422 #undef elf_backend_plt_alignment
6423 #define elf_backend_plt_alignment 4
6424 #undef elf_backend_arch_data
6425 #define elf_backend_arch_data &elf_x86_64_arch_bed
6427 #include "elf64-target.h"
6429 /* FreeBSD L1OM support. */
6431 #undef TARGET_LITTLE_SYM
6432 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6433 #undef TARGET_LITTLE_NAME
6434 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6437 #define ELF_OSABI ELFOSABI_FREEBSD
6440 #define elf64_bed elf64_l1om_fbsd_bed
6442 #include "elf64-target.h"
6444 /* Intel K1OM support. */
6447 elf64_k1om_elf_object_p (bfd
*abfd
)
6449 /* Set the right machine number for an K1OM elf64 file. */
6450 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6454 #undef TARGET_LITTLE_SYM
6455 #define TARGET_LITTLE_SYM k1om_elf64_vec
6456 #undef TARGET_LITTLE_NAME
6457 #define TARGET_LITTLE_NAME "elf64-k1om"
6459 #define ELF_ARCH bfd_arch_k1om
6461 #undef ELF_MACHINE_CODE
6462 #define ELF_MACHINE_CODE EM_K1OM
6467 #define elf64_bed elf64_k1om_bed
6469 #undef elf_backend_object_p
6470 #define elf_backend_object_p elf64_k1om_elf_object_p
6472 #undef elf_backend_static_tls_alignment
6474 #undef elf_backend_want_plt_sym
6475 #define elf_backend_want_plt_sym 0
6477 #include "elf64-target.h"
6479 /* FreeBSD K1OM support. */
6481 #undef TARGET_LITTLE_SYM
6482 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6483 #undef TARGET_LITTLE_NAME
6484 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6487 #define ELF_OSABI ELFOSABI_FREEBSD
6490 #define elf64_bed elf64_k1om_fbsd_bed
6492 #include "elf64-target.h"
6494 /* 32bit x86-64 support. */
6496 #undef TARGET_LITTLE_SYM
6497 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6498 #undef TARGET_LITTLE_NAME
6499 #define TARGET_LITTLE_NAME "elf32-x86-64"
6503 #define ELF_ARCH bfd_arch_i386
6505 #undef ELF_MACHINE_CODE
6506 #define ELF_MACHINE_CODE EM_X86_64
6510 #undef elf_backend_object_p
6511 #define elf_backend_object_p \
6512 elf32_x86_64_elf_object_p
6514 #undef elf_backend_bfd_from_remote_memory
6515 #define elf_backend_bfd_from_remote_memory \
6516 _bfd_elf32_bfd_from_remote_memory
6518 #undef elf_backend_size_info
6519 #define elf_backend_size_info \
6520 _bfd_elf32_size_info
6522 #include "elf32-target.h"