1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "libiberty.h"
34 #include "elf/x86-64.h"
41 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
42 #define MINUS_ONE (~ (bfd_vma) 0)
44 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
45 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
46 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
47 since they are the same. */
49 #define ABI_64_P(abfd) \
50 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52 /* The relocation "howto" table. Order of fields:
53 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
54 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
55 static reloc_howto_type x86_64_elf_howto_table
[] =
57 HOWTO(R_X86_64_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
58 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
60 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
61 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
63 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
64 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
67 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
69 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
70 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
72 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
73 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
76 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
78 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
79 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
81 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
82 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
84 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
85 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
87 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
88 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
90 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
91 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
93 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
94 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
95 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
96 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
97 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
99 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
100 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
101 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
102 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
104 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
105 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
107 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
108 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
110 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
111 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
113 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
114 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
116 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
117 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
119 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
120 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
122 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
123 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
125 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
126 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
128 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
129 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
130 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
131 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
132 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
133 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
134 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
135 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
137 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
138 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
140 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
141 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
142 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
143 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
144 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
146 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
147 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
149 HOWTO(R_X86_64_SIZE32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
150 bfd_elf_generic_reloc
, "R_X86_64_SIZE32", FALSE
, 0xffffffff, 0xffffffff,
152 HOWTO(R_X86_64_SIZE64
, 0, 4, 64, FALSE
, 0, complain_overflow_unsigned
,
153 bfd_elf_generic_reloc
, "R_X86_64_SIZE64", FALSE
, MINUS_ONE
, MINUS_ONE
,
155 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
156 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
157 "R_X86_64_GOTPC32_TLSDESC",
158 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
159 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
160 complain_overflow_dont
, bfd_elf_generic_reloc
,
161 "R_X86_64_TLSDESC_CALL",
163 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
164 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
166 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
167 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
168 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
170 HOWTO(R_X86_64_RELATIVE64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
171 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE64", FALSE
, MINUS_ONE
,
173 HOWTO(R_X86_64_PC32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
174 bfd_elf_generic_reloc
, "R_X86_64_PC32_BND", FALSE
, 0xffffffff, 0xffffffff,
176 HOWTO(R_X86_64_PLT32_BND
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
177 bfd_elf_generic_reloc
, "R_X86_64_PLT32_BND", FALSE
, 0xffffffff, 0xffffffff,
180 /* We have a gap in the reloc numbers here.
181 R_X86_64_standard counts the number up to this point, and
182 R_X86_64_vt_offset is the value to subtract from a reloc type of
183 R_X86_64_GNU_VT* to form an index into this table. */
184 #define R_X86_64_standard (R_X86_64_PLT32_BND + 1)
185 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
187 /* GNU extension to record C++ vtable hierarchy. */
188 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
189 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
191 /* GNU extension to record C++ vtable member usage. */
192 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
193 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
196 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
197 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
198 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
202 #define IS_X86_64_PCREL_TYPE(TYPE) \
203 ( ((TYPE) == R_X86_64_PC8) \
204 || ((TYPE) == R_X86_64_PC16) \
205 || ((TYPE) == R_X86_64_PC32) \
206 || ((TYPE) == R_X86_64_PC32_BND) \
207 || ((TYPE) == R_X86_64_PC64))
209 /* Map BFD relocs to the x86_64 elf relocs. */
212 bfd_reloc_code_real_type bfd_reloc_val
;
213 unsigned char elf_reloc_val
;
216 static const struct elf_reloc_map x86_64_reloc_map
[] =
218 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
219 { BFD_RELOC_64
, R_X86_64_64
, },
220 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
221 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
222 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
223 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
224 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
225 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
226 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
227 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
228 { BFD_RELOC_32
, R_X86_64_32
, },
229 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
230 { BFD_RELOC_16
, R_X86_64_16
, },
231 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
232 { BFD_RELOC_8
, R_X86_64_8
, },
233 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
234 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
235 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
236 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
237 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
238 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
239 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
240 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
241 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
242 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
243 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
244 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
245 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
246 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
247 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
248 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
249 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
250 { BFD_RELOC_SIZE32
, R_X86_64_SIZE32
, },
251 { BFD_RELOC_SIZE64
, R_X86_64_SIZE64
, },
252 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
253 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
254 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
255 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
256 { BFD_RELOC_X86_64_PC32_BND
, R_X86_64_PC32_BND
,},
257 { BFD_RELOC_X86_64_PLT32_BND
, R_X86_64_PLT32_BND
,},
258 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
259 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
262 static reloc_howto_type
*
263 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
267 if (r_type
== (unsigned int) R_X86_64_32
)
272 i
= ARRAY_SIZE (x86_64_elf_howto_table
) - 1;
274 else if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
275 || r_type
>= (unsigned int) R_X86_64_max
)
277 if (r_type
>= (unsigned int) R_X86_64_standard
)
279 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
281 r_type
= R_X86_64_NONE
;
286 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
287 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
288 return &x86_64_elf_howto_table
[i
];
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type
*
293 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
294 bfd_reloc_code_real_type code
)
298 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
301 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
302 return elf_x86_64_rtype_to_howto (abfd
,
303 x86_64_reloc_map
[i
].elf_reloc_val
);
308 static reloc_howto_type
*
309 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
314 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type
*reloc
318 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
319 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
323 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
324 if (x86_64_elf_howto_table
[i
].name
!= NULL
325 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
326 return &x86_64_elf_howto_table
[i
];
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
334 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
335 Elf_Internal_Rela
*dst
)
339 r_type
= ELF32_R_TYPE (dst
->r_info
);
340 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
341 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
344 /* Support for core dump NOTE sections. */
346 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
351 switch (note
->descsz
)
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
358 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
361 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
371 elf_tdata (abfd
)->core
->signal
372 = bfd_get_16 (abfd
, note
->descdata
+ 12);
375 elf_tdata (abfd
)->core
->lwpid
376 = bfd_get_32 (abfd
, note
->descdata
+ 32);
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
387 size
, note
->descpos
+ offset
);
391 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
393 switch (note
->descsz
)
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd
)->core
->pid
400 = bfd_get_32 (abfd
, note
->descdata
+ 12);
401 elf_tdata (abfd
)->core
->program
402 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
403 elf_tdata (abfd
)->core
->command
404 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd
)->core
->pid
409 = bfd_get_32 (abfd
, note
->descdata
+ 24);
410 elf_tdata (abfd
)->core
->program
411 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
412 elf_tdata (abfd
)->core
->command
413 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
421 char *command
= elf_tdata (abfd
)->core
->command
;
422 int n
= strlen (command
);
424 if (0 < n
&& command
[n
- 1] == ' ')
425 command
[n
- 1] = '\0';
433 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
436 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
438 const char *fname
, *psargs
;
449 va_start (ap
, note_type
);
450 fname
= va_arg (ap
, const char *);
451 psargs
= va_arg (ap
, const char *);
454 if (bed
->s
->elfclass
== ELFCLASS32
)
457 memset (&data
, 0, sizeof (data
));
458 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
459 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
460 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
461 &data
, sizeof (data
));
466 memset (&data
, 0, sizeof (data
));
467 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
468 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
469 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
470 &data
, sizeof (data
));
475 va_start (ap
, note_type
);
476 pid
= va_arg (ap
, long);
477 cursig
= va_arg (ap
, int);
478 gregs
= va_arg (ap
, const void *);
481 if (bed
->s
->elfclass
== ELFCLASS32
)
483 if (bed
->elf_machine_code
== EM_X86_64
)
485 prstatusx32_t prstat
;
486 memset (&prstat
, 0, sizeof (prstat
));
488 prstat
.pr_cursig
= cursig
;
489 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
490 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
491 &prstat
, sizeof (prstat
));
496 memset (&prstat
, 0, sizeof (prstat
));
498 prstat
.pr_cursig
= cursig
;
499 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
500 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
501 &prstat
, sizeof (prstat
));
507 memset (&prstat
, 0, sizeof (prstat
));
509 prstat
.pr_cursig
= cursig
;
510 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
511 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
512 &prstat
, sizeof (prstat
));
519 /* Functions for the x86-64 ELF linker. */
521 /* The name of the dynamic interpreter. This is put in the .interp
524 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
525 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
527 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
528 copying dynamic variables from a shared lib into an app's dynbss
529 section, and instead use a dynamic relocation to point into the
531 #define ELIMINATE_COPY_RELOCS 1
533 /* The size in bytes of an entry in the global offset table. */
535 #define GOT_ENTRY_SIZE 8
537 /* The size in bytes of an entry in the procedure linkage table. */
539 #define PLT_ENTRY_SIZE 16
541 /* The first entry in a procedure linkage table looks like this. See the
542 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
544 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
546 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
547 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
548 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
551 /* Subsequent entries in a procedure linkage table look like this. */
553 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
555 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
556 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
557 0x68, /* pushq immediate */
558 0, 0, 0, 0, /* replaced with index into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
563 /* The first entry in a procedure linkage table with BND relocations
566 static const bfd_byte elf_x86_64_bnd_plt0_entry
[PLT_ENTRY_SIZE
] =
568 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
569 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
570 0x0f, 0x1f, 0 /* nopl (%rax) */
573 /* Subsequent entries for legacy branches in a procedure linkage table
574 with BND relocations look like this. */
576 static const bfd_byte elf_x86_64_legacy_plt_entry
[PLT_ENTRY_SIZE
] =
578 0x68, 0, 0, 0, 0, /* pushq immediate */
579 0xe9, 0, 0, 0, 0, /* jmpq relative */
580 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
583 /* Subsequent entries for branches with BND prefx in a procedure linkage
584 table with BND relocations look like this. */
586 static const bfd_byte elf_x86_64_bnd_plt_entry
[PLT_ENTRY_SIZE
] =
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
590 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
593 /* Entries for legacy branches in the second procedure linkage table
596 static const bfd_byte elf_x86_64_legacy_plt2_entry
[8] =
598 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
599 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* Entries for branches with BND prefix in the second procedure linkage
604 table look like this. */
606 static const bfd_byte elf_x86_64_bnd_plt2_entry
[8] =
608 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
613 /* .eh_frame covering the .plt section. */
615 static const bfd_byte elf_x86_64_eh_frame_plt
[] =
617 #define PLT_CIE_LENGTH 20
618 #define PLT_FDE_LENGTH 36
619 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
620 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
621 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
622 0, 0, 0, 0, /* CIE ID */
624 'z', 'R', 0, /* Augmentation string */
625 1, /* Code alignment factor */
626 0x78, /* Data alignment factor */
627 16, /* Return address column */
628 1, /* Augmentation size */
629 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
630 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
631 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
632 DW_CFA_nop
, DW_CFA_nop
,
634 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
635 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
636 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
637 0, 0, 0, 0, /* .plt size goes here */
638 0, /* Augmentation size */
639 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
640 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
641 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
642 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
643 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
644 11, /* Block length */
645 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
646 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
647 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
648 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
649 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
652 /* Architecture-specific backend data for x86-64. */
654 struct elf_x86_64_backend_data
656 /* Templates for the initial PLT entry and for subsequent entries. */
657 const bfd_byte
*plt0_entry
;
658 const bfd_byte
*plt_entry
;
659 unsigned int plt_entry_size
; /* Size of each PLT entry. */
661 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
662 unsigned int plt0_got1_offset
;
663 unsigned int plt0_got2_offset
;
665 /* Offset of the end of the PC-relative instruction containing
667 unsigned int plt0_got2_insn_end
;
669 /* Offsets into plt_entry that are to be replaced with... */
670 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
671 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
672 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
674 /* Length of the PC-relative instruction containing plt_got_offset. */
675 unsigned int plt_got_insn_size
;
677 /* Offset of the end of the PC-relative jump to plt0_entry. */
678 unsigned int plt_plt_insn_end
;
680 /* Offset into plt_entry where the initial value of the GOT entry points. */
681 unsigned int plt_lazy_offset
;
683 /* .eh_frame covering the .plt section. */
684 const bfd_byte
*eh_frame_plt
;
685 unsigned int eh_frame_plt_size
;
688 #define get_elf_x86_64_arch_data(bed) \
689 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
691 #define get_elf_x86_64_backend_data(abfd) \
692 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
694 #define GET_PLT_ENTRY_SIZE(abfd) \
695 get_elf_x86_64_backend_data (abfd)->plt_entry_size
697 /* These are the standard parameters. */
698 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed
=
700 elf_x86_64_plt0_entry
, /* plt0_entry */
701 elf_x86_64_plt_entry
, /* plt_entry */
702 sizeof (elf_x86_64_plt_entry
), /* plt_entry_size */
703 2, /* plt0_got1_offset */
704 8, /* plt0_got2_offset */
705 12, /* plt0_got2_insn_end */
706 2, /* plt_got_offset */
707 7, /* plt_reloc_offset */
708 12, /* plt_plt_offset */
709 6, /* plt_got_insn_size */
710 PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
711 6, /* plt_lazy_offset */
712 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
713 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
716 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed
=
718 elf_x86_64_bnd_plt0_entry
, /* plt0_entry */
719 elf_x86_64_bnd_plt_entry
, /* plt_entry */
720 sizeof (elf_x86_64_bnd_plt_entry
), /* plt_entry_size */
721 2, /* plt0_got1_offset */
722 1+8, /* plt0_got2_offset */
723 1+12, /* plt0_got2_insn_end */
724 1+2, /* plt_got_offset */
725 1, /* plt_reloc_offset */
726 7, /* plt_plt_offset */
727 1+6, /* plt_got_insn_size */
728 11, /* plt_plt_insn_end */
729 0, /* plt_lazy_offset */
730 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
731 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
734 #define elf_backend_arch_data &elf_x86_64_arch_bed
736 /* x86-64 ELF linker hash entry. */
738 struct elf_x86_64_link_hash_entry
740 struct elf_link_hash_entry elf
;
742 /* Track dynamic relocs copied for this symbol. */
743 struct elf_dyn_relocs
*dyn_relocs
;
745 #define GOT_UNKNOWN 0
749 #define GOT_TLS_GDESC 4
750 #define GOT_TLS_GD_BOTH_P(type) \
751 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
752 #define GOT_TLS_GD_P(type) \
753 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
754 #define GOT_TLS_GDESC_P(type) \
755 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
756 #define GOT_TLS_GD_ANY_P(type) \
757 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
758 unsigned char tls_type
;
760 /* TRUE if a weak symbol with a real definition needs a copy reloc.
761 When there is a weak symbol with a real definition, the processor
762 independent code will have arranged for us to see the real
763 definition first. We need to copy the needs_copy bit from the
764 real definition and check it when allowing copy reloc in PIE. */
765 unsigned int needs_copy
: 1;
767 /* TRUE if symbol has at least one BND relocation. */
768 unsigned int has_bnd_reloc
: 1;
770 /* Reference count of C/C++ function pointer relocations in read-write
771 section which can be resolved at run-time. */
772 bfd_signed_vma func_pointer_refcount
;
774 /* Information about the GOT PLT entry. Filled when there are both
775 GOT and PLT relocations against the same function. */
776 union gotplt_union plt_got
;
778 /* Information about the second PLT entry. Filled when has_bnd_reloc is
780 union gotplt_union plt_bnd
;
782 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
783 starting at the end of the jump table. */
787 #define elf_x86_64_hash_entry(ent) \
788 ((struct elf_x86_64_link_hash_entry *)(ent))
790 struct elf_x86_64_obj_tdata
792 struct elf_obj_tdata root
;
794 /* tls_type for each local got entry. */
795 char *local_got_tls_type
;
797 /* GOTPLT entries for TLS descriptors. */
798 bfd_vma
*local_tlsdesc_gotent
;
801 #define elf_x86_64_tdata(abfd) \
802 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
804 #define elf_x86_64_local_got_tls_type(abfd) \
805 (elf_x86_64_tdata (abfd)->local_got_tls_type)
807 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
808 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
810 #define is_x86_64_elf(bfd) \
811 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
812 && elf_tdata (bfd) != NULL \
813 && elf_object_id (bfd) == X86_64_ELF_DATA)
816 elf_x86_64_mkobject (bfd
*abfd
)
818 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
822 /* x86-64 ELF linker hash table. */
824 struct elf_x86_64_link_hash_table
826 struct elf_link_hash_table elf
;
828 /* Short-cuts to get to dynamic linker sections. */
831 asection
*plt_eh_frame
;
837 bfd_signed_vma refcount
;
841 /* The amount of space used by the jump slots in the GOT. */
842 bfd_vma sgotplt_jump_table_size
;
844 /* Small local sym cache. */
845 struct sym_cache sym_cache
;
847 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
848 bfd_vma (*r_sym
) (bfd_vma
);
849 unsigned int pointer_r_type
;
850 const char *dynamic_interpreter
;
851 int dynamic_interpreter_size
;
853 /* _TLS_MODULE_BASE_ symbol. */
854 struct bfd_link_hash_entry
*tls_module_base
;
856 /* Used by local STT_GNU_IFUNC symbols. */
857 htab_t loc_hash_table
;
858 void * loc_hash_memory
;
860 /* The offset into splt of the PLT entry for the TLS descriptor
861 resolver. Special values are 0, if not necessary (or not found
862 to be necessary yet), and -1 if needed but not determined
865 /* The offset into sgot of the GOT entry used by the PLT entry
869 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
870 bfd_vma next_jump_slot_index
;
871 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
872 bfd_vma next_irelative_index
;
875 /* Get the x86-64 ELF linker hash table from a link_info structure. */
877 #define elf_x86_64_hash_table(p) \
878 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
879 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
881 #define elf_x86_64_compute_jump_table_size(htab) \
882 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
884 /* Create an entry in an x86-64 ELF linker hash table. */
886 static struct bfd_hash_entry
*
887 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
888 struct bfd_hash_table
*table
,
891 /* Allocate the structure if it has not already been allocated by a
895 entry
= (struct bfd_hash_entry
*)
896 bfd_hash_allocate (table
,
897 sizeof (struct elf_x86_64_link_hash_entry
));
902 /* Call the allocation method of the superclass. */
903 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
906 struct elf_x86_64_link_hash_entry
*eh
;
908 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
909 eh
->dyn_relocs
= NULL
;
910 eh
->tls_type
= GOT_UNKNOWN
;
912 eh
->has_bnd_reloc
= 0;
913 eh
->func_pointer_refcount
= 0;
914 eh
->plt_bnd
.offset
= (bfd_vma
) -1;
915 eh
->plt_got
.offset
= (bfd_vma
) -1;
916 eh
->tlsdesc_got
= (bfd_vma
) -1;
922 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
923 for local symbol so that we can handle local STT_GNU_IFUNC symbols
924 as global symbol. We reuse indx and dynstr_index for local symbol
925 hash since they aren't used by global symbols in this backend. */
928 elf_x86_64_local_htab_hash (const void *ptr
)
930 struct elf_link_hash_entry
*h
931 = (struct elf_link_hash_entry
*) ptr
;
932 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
935 /* Compare local hash entries. */
938 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
940 struct elf_link_hash_entry
*h1
941 = (struct elf_link_hash_entry
*) ptr1
;
942 struct elf_link_hash_entry
*h2
943 = (struct elf_link_hash_entry
*) ptr2
;
945 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
948 /* Find and/or create a hash entry for local symbol. */
950 static struct elf_link_hash_entry
*
951 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
952 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
955 struct elf_x86_64_link_hash_entry e
, *ret
;
956 asection
*sec
= abfd
->sections
;
957 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
958 htab
->r_sym (rel
->r_info
));
961 e
.elf
.indx
= sec
->id
;
962 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
963 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
964 create
? INSERT
: NO_INSERT
);
971 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
975 ret
= (struct elf_x86_64_link_hash_entry
*)
976 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
977 sizeof (struct elf_x86_64_link_hash_entry
));
980 memset (ret
, 0, sizeof (*ret
));
981 ret
->elf
.indx
= sec
->id
;
982 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
983 ret
->elf
.dynindx
= -1;
984 ret
->func_pointer_refcount
= 0;
985 ret
->plt_got
.offset
= (bfd_vma
) -1;
991 /* Destroy an X86-64 ELF linker hash table. */
994 elf_x86_64_link_hash_table_free (bfd
*obfd
)
996 struct elf_x86_64_link_hash_table
*htab
997 = (struct elf_x86_64_link_hash_table
*) obfd
->link
.hash
;
999 if (htab
->loc_hash_table
)
1000 htab_delete (htab
->loc_hash_table
);
1001 if (htab
->loc_hash_memory
)
1002 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
1003 _bfd_elf_link_hash_table_free (obfd
);
1006 /* Create an X86-64 ELF linker hash table. */
1008 static struct bfd_link_hash_table
*
1009 elf_x86_64_link_hash_table_create (bfd
*abfd
)
1011 struct elf_x86_64_link_hash_table
*ret
;
1012 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
1014 ret
= (struct elf_x86_64_link_hash_table
*) bfd_zmalloc (amt
);
1018 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
1019 elf_x86_64_link_hash_newfunc
,
1020 sizeof (struct elf_x86_64_link_hash_entry
),
1027 if (ABI_64_P (abfd
))
1029 ret
->r_info
= elf64_r_info
;
1030 ret
->r_sym
= elf64_r_sym
;
1031 ret
->pointer_r_type
= R_X86_64_64
;
1032 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
1033 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
1037 ret
->r_info
= elf32_r_info
;
1038 ret
->r_sym
= elf32_r_sym
;
1039 ret
->pointer_r_type
= R_X86_64_32
;
1040 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
1041 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
1044 ret
->loc_hash_table
= htab_try_create (1024,
1045 elf_x86_64_local_htab_hash
,
1046 elf_x86_64_local_htab_eq
,
1048 ret
->loc_hash_memory
= objalloc_create ();
1049 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
1051 elf_x86_64_link_hash_table_free (abfd
);
1054 ret
->elf
.root
.hash_table_free
= elf_x86_64_link_hash_table_free
;
1056 return &ret
->elf
.root
;
1059 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1060 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1064 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
1065 struct bfd_link_info
*info
)
1067 struct elf_x86_64_link_hash_table
*htab
;
1069 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
1072 htab
= elf_x86_64_hash_table (info
);
1076 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
1080 if (bfd_link_executable (info
))
1082 /* Always allow copy relocs for building executables. */
1083 asection
*s
= bfd_get_linker_section (dynobj
, ".rela.bss");
1086 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
1087 s
= bfd_make_section_anyway_with_flags (dynobj
,
1089 (bed
->dynamic_sec_flags
1092 || ! bfd_set_section_alignment (dynobj
, s
,
1093 bed
->s
->log_file_align
))
1099 if (!info
->no_ld_generated_unwind_info
1100 && htab
->plt_eh_frame
== NULL
1101 && htab
->elf
.splt
!= NULL
)
1103 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
1104 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1105 | SEC_LINKER_CREATED
);
1107 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
1108 if (htab
->plt_eh_frame
== NULL
1109 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
1115 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1118 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1119 struct elf_link_hash_entry
*dir
,
1120 struct elf_link_hash_entry
*ind
)
1122 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1124 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1125 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1127 if (!edir
->has_bnd_reloc
)
1128 edir
->has_bnd_reloc
= eind
->has_bnd_reloc
;
1130 if (eind
->dyn_relocs
!= NULL
)
1132 if (edir
->dyn_relocs
!= NULL
)
1134 struct elf_dyn_relocs
**pp
;
1135 struct elf_dyn_relocs
*p
;
1137 /* Add reloc counts against the indirect sym to the direct sym
1138 list. Merge any entries against the same section. */
1139 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1141 struct elf_dyn_relocs
*q
;
1143 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1144 if (q
->sec
== p
->sec
)
1146 q
->pc_count
+= p
->pc_count
;
1147 q
->count
+= p
->count
;
1154 *pp
= edir
->dyn_relocs
;
1157 edir
->dyn_relocs
= eind
->dyn_relocs
;
1158 eind
->dyn_relocs
= NULL
;
1161 if (ind
->root
.type
== bfd_link_hash_indirect
1162 && dir
->got
.refcount
<= 0)
1164 edir
->tls_type
= eind
->tls_type
;
1165 eind
->tls_type
= GOT_UNKNOWN
;
1168 if (ELIMINATE_COPY_RELOCS
1169 && ind
->root
.type
!= bfd_link_hash_indirect
1170 && dir
->dynamic_adjusted
)
1172 /* If called to transfer flags for a weakdef during processing
1173 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1174 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1175 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1176 dir
->ref_regular
|= ind
->ref_regular
;
1177 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1178 dir
->needs_plt
|= ind
->needs_plt
;
1179 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1183 if (eind
->func_pointer_refcount
> 0)
1185 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1186 eind
->func_pointer_refcount
= 0;
1189 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1194 elf64_x86_64_elf_object_p (bfd
*abfd
)
1196 /* Set the right machine number for an x86-64 elf64 file. */
1197 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1202 elf32_x86_64_elf_object_p (bfd
*abfd
)
1204 /* Set the right machine number for an x86-64 elf32 file. */
1205 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1209 /* Return TRUE if the TLS access code sequence support transition
1213 elf_x86_64_check_tls_transition (bfd
*abfd
,
1214 struct bfd_link_info
*info
,
1217 Elf_Internal_Shdr
*symtab_hdr
,
1218 struct elf_link_hash_entry
**sym_hashes
,
1219 unsigned int r_type
,
1220 const Elf_Internal_Rela
*rel
,
1221 const Elf_Internal_Rela
*relend
)
1224 unsigned long r_symndx
;
1225 bfd_boolean largepic
= FALSE
;
1226 struct elf_link_hash_entry
*h
;
1228 struct elf_x86_64_link_hash_table
*htab
;
1230 /* Get the section contents. */
1231 if (contents
== NULL
)
1233 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1234 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1237 /* FIXME: How to better handle error condition? */
1238 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1241 /* Cache the section contents for elf_link_input_bfd. */
1242 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1246 htab
= elf_x86_64_hash_table (info
);
1247 offset
= rel
->r_offset
;
1250 case R_X86_64_TLSGD
:
1251 case R_X86_64_TLSLD
:
1252 if ((rel
+ 1) >= relend
)
1255 if (r_type
== R_X86_64_TLSGD
)
1257 /* Check transition from GD access model. For 64bit, only
1258 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1259 .word 0x6666; rex64; call __tls_get_addr
1260 can transit to different access model. For 32bit, only
1261 leaq foo@tlsgd(%rip), %rdi
1262 .word 0x6666; rex64; call __tls_get_addr
1263 can transit to different access model. For largepic
1265 leaq foo@tlsgd(%rip), %rdi
1266 movabsq $__tls_get_addr@pltoff, %rax
1270 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1271 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1273 if ((offset
+ 12) > sec
->size
)
1276 if (memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1278 if (!ABI_64_P (abfd
)
1279 || (offset
+ 19) > sec
->size
1281 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0
1282 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1283 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1288 else if (ABI_64_P (abfd
))
1291 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1297 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1303 /* Check transition from LD access model. Only
1304 leaq foo@tlsld(%rip), %rdi;
1306 can transit to different access model. For largepic
1308 leaq foo@tlsld(%rip), %rdi
1309 movabsq $__tls_get_addr@pltoff, %rax
1313 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1315 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1318 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1321 if (0xe8 != *(contents
+ offset
+ 4))
1323 if (!ABI_64_P (abfd
)
1324 || (offset
+ 19) > sec
->size
1325 || memcmp (contents
+ offset
+ 4, "\x48\xb8", 2) != 0
1326 || memcmp (contents
+ offset
+ 14, "\x48\x01\xd8\xff\xd0", 5)
1333 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1334 if (r_symndx
< symtab_hdr
->sh_info
)
1337 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1338 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1339 may be versioned. */
1341 && h
->root
.root
.string
!= NULL
1343 ? ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLTOFF64
1344 : (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1345 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
))
1346 && (strncmp (h
->root
.root
.string
,
1347 "__tls_get_addr", 14) == 0));
1349 case R_X86_64_GOTTPOFF
:
1350 /* Check transition from IE access model:
1351 mov foo@gottpoff(%rip), %reg
1352 add foo@gottpoff(%rip), %reg
1355 /* Check REX prefix first. */
1356 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1358 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1359 if (val
!= 0x48 && val
!= 0x4c)
1361 /* X32 may have 0x44 REX prefix or no REX prefix. */
1362 if (ABI_64_P (abfd
))
1368 /* X32 may not have any REX prefix. */
1369 if (ABI_64_P (abfd
))
1371 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1375 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1376 if (val
!= 0x8b && val
!= 0x03)
1379 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1380 return (val
& 0xc7) == 5;
1382 case R_X86_64_GOTPC32_TLSDESC
:
1383 /* Check transition from GDesc access model:
1384 leaq x@tlsdesc(%rip), %rax
1386 Make sure it's a leaq adding rip to a 32-bit offset
1387 into any register, although it's probably almost always
1390 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1393 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1394 if ((val
& 0xfb) != 0x48)
1397 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1400 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1401 return (val
& 0xc7) == 0x05;
1403 case R_X86_64_TLSDESC_CALL
:
1404 /* Check transition from GDesc access model:
1405 call *x@tlsdesc(%rax)
1407 if (offset
+ 2 <= sec
->size
)
1409 /* Make sure that it's a call *x@tlsdesc(%rax). */
1410 static const unsigned char call
[] = { 0xff, 0x10 };
1411 return memcmp (contents
+ offset
, call
, 2) == 0;
1421 /* Return TRUE if the TLS access transition is OK or no transition
1422 will be performed. Update R_TYPE if there is a transition. */
1425 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1426 asection
*sec
, bfd_byte
*contents
,
1427 Elf_Internal_Shdr
*symtab_hdr
,
1428 struct elf_link_hash_entry
**sym_hashes
,
1429 unsigned int *r_type
, int tls_type
,
1430 const Elf_Internal_Rela
*rel
,
1431 const Elf_Internal_Rela
*relend
,
1432 struct elf_link_hash_entry
*h
,
1433 unsigned long r_symndx
)
1435 unsigned int from_type
= *r_type
;
1436 unsigned int to_type
= from_type
;
1437 bfd_boolean check
= TRUE
;
1439 /* Skip TLS transition for functions. */
1441 && (h
->type
== STT_FUNC
1442 || h
->type
== STT_GNU_IFUNC
))
1447 case R_X86_64_TLSGD
:
1448 case R_X86_64_GOTPC32_TLSDESC
:
1449 case R_X86_64_TLSDESC_CALL
:
1450 case R_X86_64_GOTTPOFF
:
1451 if (bfd_link_executable (info
))
1454 to_type
= R_X86_64_TPOFF32
;
1456 to_type
= R_X86_64_GOTTPOFF
;
1459 /* When we are called from elf_x86_64_relocate_section,
1460 CONTENTS isn't NULL and there may be additional transitions
1461 based on TLS_TYPE. */
1462 if (contents
!= NULL
)
1464 unsigned int new_to_type
= to_type
;
1466 if (bfd_link_executable (info
)
1469 && tls_type
== GOT_TLS_IE
)
1470 new_to_type
= R_X86_64_TPOFF32
;
1472 if (to_type
== R_X86_64_TLSGD
1473 || to_type
== R_X86_64_GOTPC32_TLSDESC
1474 || to_type
== R_X86_64_TLSDESC_CALL
)
1476 if (tls_type
== GOT_TLS_IE
)
1477 new_to_type
= R_X86_64_GOTTPOFF
;
1480 /* We checked the transition before when we were called from
1481 elf_x86_64_check_relocs. We only want to check the new
1482 transition which hasn't been checked before. */
1483 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1484 to_type
= new_to_type
;
1489 case R_X86_64_TLSLD
:
1490 if (bfd_link_executable (info
))
1491 to_type
= R_X86_64_TPOFF32
;
1498 /* Return TRUE if there is no transition. */
1499 if (from_type
== to_type
)
1502 /* Check if the transition can be performed. */
1504 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1505 symtab_hdr
, sym_hashes
,
1506 from_type
, rel
, relend
))
1508 reloc_howto_type
*from
, *to
;
1511 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1512 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1515 name
= h
->root
.root
.string
;
1518 struct elf_x86_64_link_hash_table
*htab
;
1520 htab
= elf_x86_64_hash_table (info
);
1525 Elf_Internal_Sym
*isym
;
1527 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1529 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1533 (*_bfd_error_handler
)
1534 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1535 "in section `%A' failed"),
1536 abfd
, sec
, from
->name
, to
->name
, name
,
1537 (unsigned long) rel
->r_offset
);
1538 bfd_set_error (bfd_error_bad_value
);
1546 /* Rename some of the generic section flags to better document how they
1548 #define need_convert_mov_to_lea sec_flg0
1550 /* Look through the relocs for a section during the first phase, and
1551 calculate needed space in the global offset table, procedure
1552 linkage table, and dynamic reloc sections. */
1555 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1557 const Elf_Internal_Rela
*relocs
)
1559 struct elf_x86_64_link_hash_table
*htab
;
1560 Elf_Internal_Shdr
*symtab_hdr
;
1561 struct elf_link_hash_entry
**sym_hashes
;
1562 const Elf_Internal_Rela
*rel
;
1563 const Elf_Internal_Rela
*rel_end
;
1565 bfd_boolean use_plt_got
;
1567 if (bfd_link_relocatable (info
))
1570 BFD_ASSERT (is_x86_64_elf (abfd
));
1572 htab
= elf_x86_64_hash_table (info
);
1576 use_plt_got
= get_elf_x86_64_backend_data (abfd
) == &elf_x86_64_arch_bed
;
1578 symtab_hdr
= &elf_symtab_hdr (abfd
);
1579 sym_hashes
= elf_sym_hashes (abfd
);
1583 rel_end
= relocs
+ sec
->reloc_count
;
1584 for (rel
= relocs
; rel
< rel_end
; rel
++)
1586 unsigned int r_type
;
1587 unsigned long r_symndx
;
1588 struct elf_link_hash_entry
*h
;
1589 Elf_Internal_Sym
*isym
;
1591 bfd_boolean size_reloc
;
1593 r_symndx
= htab
->r_sym (rel
->r_info
);
1594 r_type
= ELF32_R_TYPE (rel
->r_info
);
1596 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1598 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1603 if (r_symndx
< symtab_hdr
->sh_info
)
1605 /* A local symbol. */
1606 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1611 /* Check relocation against local STT_GNU_IFUNC symbol. */
1612 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1614 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1619 /* Fake a STT_GNU_IFUNC symbol. */
1620 h
->type
= STT_GNU_IFUNC
;
1623 h
->forced_local
= 1;
1624 h
->root
.type
= bfd_link_hash_defined
;
1632 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1633 while (h
->root
.type
== bfd_link_hash_indirect
1634 || h
->root
.type
== bfd_link_hash_warning
)
1635 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1638 /* Check invalid x32 relocations. */
1639 if (!ABI_64_P (abfd
))
1645 case R_X86_64_DTPOFF64
:
1646 case R_X86_64_TPOFF64
:
1648 case R_X86_64_GOTOFF64
:
1649 case R_X86_64_GOT64
:
1650 case R_X86_64_GOTPCREL64
:
1651 case R_X86_64_GOTPC64
:
1652 case R_X86_64_GOTPLT64
:
1653 case R_X86_64_PLTOFF64
:
1656 name
= h
->root
.root
.string
;
1658 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1660 (*_bfd_error_handler
)
1661 (_("%B: relocation %s against symbol `%s' isn't "
1662 "supported in x32 mode"), abfd
,
1663 x86_64_elf_howto_table
[r_type
].name
, name
);
1664 bfd_set_error (bfd_error_bad_value
);
1672 /* Create the ifunc sections for static executables. If we
1673 never see an indirect function symbol nor we are building
1674 a static executable, those sections will be empty and
1675 won't appear in output. */
1681 case R_X86_64_PC32_BND
:
1682 case R_X86_64_PLT32_BND
:
1684 case R_X86_64_PLT32
:
1687 /* MPX PLT is supported only if elf_x86_64_arch_bed
1688 is used in 64-bit mode. */
1691 && (get_elf_x86_64_backend_data (abfd
)
1692 == &elf_x86_64_arch_bed
))
1694 elf_x86_64_hash_entry (h
)->has_bnd_reloc
= 1;
1696 /* Create the second PLT for Intel MPX support. */
1697 if (htab
->plt_bnd
== NULL
)
1699 unsigned int plt_bnd_align
;
1700 const struct elf_backend_data
*bed
;
1702 bed
= get_elf_backend_data (info
->output_bfd
);
1703 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry
) == 8
1704 && (sizeof (elf_x86_64_bnd_plt2_entry
)
1705 == sizeof (elf_x86_64_legacy_plt2_entry
)));
1708 if (htab
->elf
.dynobj
== NULL
)
1709 htab
->elf
.dynobj
= abfd
;
1711 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
1713 (bed
->dynamic_sec_flags
1718 if (htab
->plt_bnd
== NULL
1719 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
1728 case R_X86_64_GOTPCREL
:
1729 case R_X86_64_GOTPCREL64
:
1730 if (htab
->elf
.dynobj
== NULL
)
1731 htab
->elf
.dynobj
= abfd
;
1732 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1737 /* It is referenced by a non-shared object. */
1739 h
->root
.non_ir_ref
= 1;
1741 if (h
->type
== STT_GNU_IFUNC
)
1742 elf_tdata (info
->output_bfd
)->has_gnu_symbols
1743 |= elf_gnu_symbol_ifunc
;
1746 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1747 symtab_hdr
, sym_hashes
,
1748 &r_type
, GOT_UNKNOWN
,
1749 rel
, rel_end
, h
, r_symndx
))
1754 case R_X86_64_TLSLD
:
1755 htab
->tls_ld_got
.refcount
+= 1;
1758 case R_X86_64_TPOFF32
:
1759 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
1762 name
= h
->root
.root
.string
;
1764 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1766 (*_bfd_error_handler
)
1767 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1769 x86_64_elf_howto_table
[r_type
].name
, name
);
1770 bfd_set_error (bfd_error_bad_value
);
1775 case R_X86_64_GOTTPOFF
:
1776 if (!bfd_link_executable (info
))
1777 info
->flags
|= DF_STATIC_TLS
;
1780 case R_X86_64_GOT32
:
1781 case R_X86_64_GOTPCREL
:
1782 case R_X86_64_TLSGD
:
1783 case R_X86_64_GOT64
:
1784 case R_X86_64_GOTPCREL64
:
1785 case R_X86_64_GOTPLT64
:
1786 case R_X86_64_GOTPC32_TLSDESC
:
1787 case R_X86_64_TLSDESC_CALL
:
1788 /* This symbol requires a global offset table entry. */
1790 int tls_type
, old_tls_type
;
1794 default: tls_type
= GOT_NORMAL
; break;
1795 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1796 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1797 case R_X86_64_GOTPC32_TLSDESC
:
1798 case R_X86_64_TLSDESC_CALL
:
1799 tls_type
= GOT_TLS_GDESC
; break;
1804 h
->got
.refcount
+= 1;
1805 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1809 bfd_signed_vma
*local_got_refcounts
;
1811 /* This is a global offset table entry for a local symbol. */
1812 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1813 if (local_got_refcounts
== NULL
)
1817 size
= symtab_hdr
->sh_info
;
1818 size
*= sizeof (bfd_signed_vma
)
1819 + sizeof (bfd_vma
) + sizeof (char);
1820 local_got_refcounts
= ((bfd_signed_vma
*)
1821 bfd_zalloc (abfd
, size
));
1822 if (local_got_refcounts
== NULL
)
1824 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1825 elf_x86_64_local_tlsdesc_gotent (abfd
)
1826 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1827 elf_x86_64_local_got_tls_type (abfd
)
1828 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1830 local_got_refcounts
[r_symndx
] += 1;
1832 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1835 /* If a TLS symbol is accessed using IE at least once,
1836 there is no point to use dynamic model for it. */
1837 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1838 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1839 || tls_type
!= GOT_TLS_IE
))
1841 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1842 tls_type
= old_tls_type
;
1843 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1844 && GOT_TLS_GD_ANY_P (tls_type
))
1845 tls_type
|= old_tls_type
;
1849 name
= h
->root
.root
.string
;
1851 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1853 (*_bfd_error_handler
)
1854 (_("%B: '%s' accessed both as normal and thread local symbol"),
1856 bfd_set_error (bfd_error_bad_value
);
1861 if (old_tls_type
!= tls_type
)
1864 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1866 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1871 case R_X86_64_GOTOFF64
:
1872 case R_X86_64_GOTPC32
:
1873 case R_X86_64_GOTPC64
:
1875 if (htab
->elf
.sgot
== NULL
)
1877 if (htab
->elf
.dynobj
== NULL
)
1878 htab
->elf
.dynobj
= abfd
;
1879 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1885 case R_X86_64_PLT32
:
1886 case R_X86_64_PLT32_BND
:
1887 /* This symbol requires a procedure linkage table entry. We
1888 actually build the entry in adjust_dynamic_symbol,
1889 because this might be a case of linking PIC code which is
1890 never referenced by a dynamic object, in which case we
1891 don't need to generate a procedure linkage table entry
1894 /* If this is a local symbol, we resolve it directly without
1895 creating a procedure linkage table entry. */
1900 h
->plt
.refcount
+= 1;
1903 case R_X86_64_PLTOFF64
:
1904 /* This tries to form the 'address' of a function relative
1905 to GOT. For global symbols we need a PLT entry. */
1909 h
->plt
.refcount
+= 1;
1913 case R_X86_64_SIZE32
:
1914 case R_X86_64_SIZE64
:
1919 if (!ABI_64_P (abfd
))
1924 /* Let's help debug shared library creation. These relocs
1925 cannot be used in shared libs. Don't error out for
1926 sections we don't care about, such as debug sections or
1927 non-constant sections. */
1928 if (bfd_link_pic (info
)
1929 && (sec
->flags
& SEC_ALLOC
) != 0
1930 && (sec
->flags
& SEC_READONLY
) != 0)
1933 name
= h
->root
.root
.string
;
1935 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1936 (*_bfd_error_handler
)
1937 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1938 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1939 bfd_set_error (bfd_error_bad_value
);
1947 case R_X86_64_PC32_BND
:
1951 if (h
!= NULL
&& bfd_link_executable (info
))
1953 /* If this reloc is in a read-only section, we might
1954 need a copy reloc. We can't check reliably at this
1955 stage whether the section is read-only, as input
1956 sections have not yet been mapped to output sections.
1957 Tentatively set the flag for now, and correct in
1958 adjust_dynamic_symbol. */
1961 /* We may need a .plt entry if the function this reloc
1962 refers to is in a shared lib. */
1963 h
->plt
.refcount
+= 1;
1964 if (r_type
!= R_X86_64_PC32
1965 && r_type
!= R_X86_64_PC32_BND
1966 && r_type
!= R_X86_64_PC64
)
1968 h
->pointer_equality_needed
= 1;
1969 /* At run-time, R_X86_64_64 can be resolved for both
1970 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
1971 can only be resolved for x32. */
1972 if ((sec
->flags
& SEC_READONLY
) == 0
1973 && (r_type
== R_X86_64_64
1974 || (!ABI_64_P (abfd
)
1975 && (r_type
== R_X86_64_32
1976 || r_type
== R_X86_64_32S
))))
1978 struct elf_x86_64_link_hash_entry
*eh
1979 = (struct elf_x86_64_link_hash_entry
*) h
;
1980 eh
->func_pointer_refcount
+= 1;
1987 /* If we are creating a shared library, and this is a reloc
1988 against a global symbol, or a non PC relative reloc
1989 against a local symbol, then we need to copy the reloc
1990 into the shared library. However, if we are linking with
1991 -Bsymbolic, we do not need to copy a reloc against a
1992 global symbol which is defined in an object we are
1993 including in the link (i.e., DEF_REGULAR is set). At
1994 this point we have not seen all the input files, so it is
1995 possible that DEF_REGULAR is not set now but will be set
1996 later (it is never cleared). In case of a weak definition,
1997 DEF_REGULAR may be cleared later by a strong definition in
1998 a shared library. We account for that possibility below by
1999 storing information in the relocs_copied field of the hash
2000 table entry. A similar situation occurs when creating
2001 shared libraries and symbol visibility changes render the
2004 If on the other hand, we are creating an executable, we
2005 may need to keep relocations for symbols satisfied by a
2006 dynamic library if we manage to avoid copy relocs for the
2008 if ((bfd_link_pic (info
)
2009 && (sec
->flags
& SEC_ALLOC
) != 0
2010 && (! IS_X86_64_PCREL_TYPE (r_type
)
2012 && (! SYMBOLIC_BIND (info
, h
)
2013 || h
->root
.type
== bfd_link_hash_defweak
2014 || !h
->def_regular
))))
2015 || (ELIMINATE_COPY_RELOCS
2016 && !bfd_link_pic (info
)
2017 && (sec
->flags
& SEC_ALLOC
) != 0
2019 && (h
->root
.type
== bfd_link_hash_defweak
2020 || !h
->def_regular
)))
2022 struct elf_dyn_relocs
*p
;
2023 struct elf_dyn_relocs
**head
;
2025 /* We must copy these reloc types into the output file.
2026 Create a reloc section in dynobj and make room for
2030 if (htab
->elf
.dynobj
== NULL
)
2031 htab
->elf
.dynobj
= abfd
;
2033 sreloc
= _bfd_elf_make_dynamic_reloc_section
2034 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
2035 abfd
, /*rela?*/ TRUE
);
2041 /* If this is a global symbol, we count the number of
2042 relocations we need for this symbol. */
2045 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
2049 /* Track dynamic relocs needed for local syms too.
2050 We really need local syms available to do this
2055 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2060 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2064 /* Beware of type punned pointers vs strict aliasing
2066 vpp
= &(elf_section_data (s
)->local_dynrel
);
2067 head
= (struct elf_dyn_relocs
**)vpp
;
2071 if (p
== NULL
|| p
->sec
!= sec
)
2073 bfd_size_type amt
= sizeof *p
;
2075 p
= ((struct elf_dyn_relocs
*)
2076 bfd_alloc (htab
->elf
.dynobj
, amt
));
2087 /* Count size relocation as PC-relative relocation. */
2088 if (IS_X86_64_PCREL_TYPE (r_type
) || size_reloc
)
2093 /* This relocation describes the C++ object vtable hierarchy.
2094 Reconstruct it for later use during GC. */
2095 case R_X86_64_GNU_VTINHERIT
:
2096 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2100 /* This relocation describes which C++ vtable entries are actually
2101 used. Record for later use during GC. */
2102 case R_X86_64_GNU_VTENTRY
:
2103 BFD_ASSERT (h
!= NULL
);
2105 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2115 && h
->plt
.refcount
> 0
2116 && (((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2117 || h
->got
.refcount
> 0)
2118 && htab
->plt_got
== NULL
)
2120 /* Create the GOT procedure linkage table. */
2121 unsigned int plt_got_align
;
2122 const struct elf_backend_data
*bed
;
2124 bed
= get_elf_backend_data (info
->output_bfd
);
2125 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry
) == 8
2126 && (sizeof (elf_x86_64_bnd_plt2_entry
)
2127 == sizeof (elf_x86_64_legacy_plt2_entry
)));
2130 if (htab
->elf
.dynobj
== NULL
)
2131 htab
->elf
.dynobj
= abfd
;
2133 = bfd_make_section_anyway_with_flags (htab
->elf
.dynobj
,
2135 (bed
->dynamic_sec_flags
2140 if (htab
->plt_got
== NULL
2141 || !bfd_set_section_alignment (htab
->elf
.dynobj
,
2147 if (r_type
== R_X86_64_GOTPCREL
2148 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2149 sec
->need_convert_mov_to_lea
= 1;
2155 /* Return the section that should be marked against GC for a given
2159 elf_x86_64_gc_mark_hook (asection
*sec
,
2160 struct bfd_link_info
*info
,
2161 Elf_Internal_Rela
*rel
,
2162 struct elf_link_hash_entry
*h
,
2163 Elf_Internal_Sym
*sym
)
2166 switch (ELF32_R_TYPE (rel
->r_info
))
2168 case R_X86_64_GNU_VTINHERIT
:
2169 case R_X86_64_GNU_VTENTRY
:
2173 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2176 /* Update the got entry reference counts for the section being removed. */
2179 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
2181 const Elf_Internal_Rela
*relocs
)
2183 struct elf_x86_64_link_hash_table
*htab
;
2184 Elf_Internal_Shdr
*symtab_hdr
;
2185 struct elf_link_hash_entry
**sym_hashes
;
2186 bfd_signed_vma
*local_got_refcounts
;
2187 const Elf_Internal_Rela
*rel
, *relend
;
2189 if (bfd_link_relocatable (info
))
2192 htab
= elf_x86_64_hash_table (info
);
2196 elf_section_data (sec
)->local_dynrel
= NULL
;
2198 symtab_hdr
= &elf_symtab_hdr (abfd
);
2199 sym_hashes
= elf_sym_hashes (abfd
);
2200 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2202 htab
= elf_x86_64_hash_table (info
);
2203 relend
= relocs
+ sec
->reloc_count
;
2204 for (rel
= relocs
; rel
< relend
; rel
++)
2206 unsigned long r_symndx
;
2207 unsigned int r_type
;
2208 struct elf_link_hash_entry
*h
= NULL
;
2209 bfd_boolean pointer_reloc
;
2211 r_symndx
= htab
->r_sym (rel
->r_info
);
2212 if (r_symndx
>= symtab_hdr
->sh_info
)
2214 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2215 while (h
->root
.type
== bfd_link_hash_indirect
2216 || h
->root
.type
== bfd_link_hash_warning
)
2217 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2221 /* A local symbol. */
2222 Elf_Internal_Sym
*isym
;
2224 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2227 /* Check relocation against local STT_GNU_IFUNC symbol. */
2229 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2231 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2239 struct elf_x86_64_link_hash_entry
*eh
;
2240 struct elf_dyn_relocs
**pp
;
2241 struct elf_dyn_relocs
*p
;
2243 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2245 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2248 /* Everything must go for SEC. */
2254 r_type
= ELF32_R_TYPE (rel
->r_info
);
2255 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2256 symtab_hdr
, sym_hashes
,
2257 &r_type
, GOT_UNKNOWN
,
2258 rel
, relend
, h
, r_symndx
))
2261 pointer_reloc
= FALSE
;
2264 case R_X86_64_TLSLD
:
2265 if (htab
->tls_ld_got
.refcount
> 0)
2266 htab
->tls_ld_got
.refcount
-= 1;
2269 case R_X86_64_TLSGD
:
2270 case R_X86_64_GOTPC32_TLSDESC
:
2271 case R_X86_64_TLSDESC_CALL
:
2272 case R_X86_64_GOTTPOFF
:
2273 case R_X86_64_GOT32
:
2274 case R_X86_64_GOTPCREL
:
2275 case R_X86_64_GOT64
:
2276 case R_X86_64_GOTPCREL64
:
2277 case R_X86_64_GOTPLT64
:
2280 if (h
->got
.refcount
> 0)
2281 h
->got
.refcount
-= 1;
2282 if (h
->type
== STT_GNU_IFUNC
)
2284 if (h
->plt
.refcount
> 0)
2285 h
->plt
.refcount
-= 1;
2288 else if (local_got_refcounts
!= NULL
)
2290 if (local_got_refcounts
[r_symndx
] > 0)
2291 local_got_refcounts
[r_symndx
] -= 1;
2297 pointer_reloc
= !ABI_64_P (abfd
);
2301 pointer_reloc
= TRUE
;
2307 case R_X86_64_PC32_BND
:
2309 case R_X86_64_SIZE32
:
2310 case R_X86_64_SIZE64
:
2312 if (bfd_link_pic (info
)
2313 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2317 case R_X86_64_PLT32
:
2318 case R_X86_64_PLT32_BND
:
2319 case R_X86_64_PLTOFF64
:
2322 if (h
->plt
.refcount
> 0)
2323 h
->plt
.refcount
-= 1;
2324 if (pointer_reloc
&& (sec
->flags
& SEC_READONLY
) == 0)
2326 struct elf_x86_64_link_hash_entry
*eh
2327 = (struct elf_x86_64_link_hash_entry
*) h
;
2328 if (eh
->func_pointer_refcount
> 0)
2329 eh
->func_pointer_refcount
-= 1;
2342 /* Adjust a symbol defined by a dynamic object and referenced by a
2343 regular object. The current definition is in some section of the
2344 dynamic object, but we're not including those sections. We have to
2345 change the definition to something the rest of the link can
2349 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2350 struct elf_link_hash_entry
*h
)
2352 struct elf_x86_64_link_hash_table
*htab
;
2354 struct elf_x86_64_link_hash_entry
*eh
;
2355 struct elf_dyn_relocs
*p
;
2357 /* STT_GNU_IFUNC symbol must go through PLT. */
2358 if (h
->type
== STT_GNU_IFUNC
)
2360 /* All local STT_GNU_IFUNC references must be treate as local
2361 calls via local PLT. */
2363 && SYMBOL_CALLS_LOCAL (info
, h
))
2365 bfd_size_type pc_count
= 0, count
= 0;
2366 struct elf_dyn_relocs
**pp
;
2368 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2369 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2371 pc_count
+= p
->pc_count
;
2372 p
->count
-= p
->pc_count
;
2381 if (pc_count
|| count
)
2385 if (h
->plt
.refcount
<= 0)
2386 h
->plt
.refcount
= 1;
2388 h
->plt
.refcount
+= 1;
2392 if (h
->plt
.refcount
<= 0)
2394 h
->plt
.offset
= (bfd_vma
) -1;
2400 /* If this is a function, put it in the procedure linkage table. We
2401 will fill in the contents of the procedure linkage table later,
2402 when we know the address of the .got section. */
2403 if (h
->type
== STT_FUNC
2406 if (h
->plt
.refcount
<= 0
2407 || SYMBOL_CALLS_LOCAL (info
, h
)
2408 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2409 && h
->root
.type
== bfd_link_hash_undefweak
))
2411 /* This case can occur if we saw a PLT32 reloc in an input
2412 file, but the symbol was never referred to by a dynamic
2413 object, or if all references were garbage collected. In
2414 such a case, we don't actually need to build a procedure
2415 linkage table, and we can just do a PC32 reloc instead. */
2416 h
->plt
.offset
= (bfd_vma
) -1;
2423 /* It's possible that we incorrectly decided a .plt reloc was
2424 needed for an R_X86_64_PC32 reloc to a non-function sym in
2425 check_relocs. We can't decide accurately between function and
2426 non-function syms in check-relocs; Objects loaded later in
2427 the link may change h->type. So fix it now. */
2428 h
->plt
.offset
= (bfd_vma
) -1;
2430 /* If this is a weak symbol, and there is a real definition, the
2431 processor independent code will have arranged for us to see the
2432 real definition first, and we can just use the same value. */
2433 if (h
->u
.weakdef
!= NULL
)
2435 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2436 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2437 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2438 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2439 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2441 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2442 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2443 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
2448 /* This is a reference to a symbol defined by a dynamic object which
2449 is not a function. */
2451 /* If we are creating a shared library, we must presume that the
2452 only references to the symbol are via the global offset table.
2453 For such cases we need not do anything here; the relocations will
2454 be handled correctly by relocate_section. */
2455 if (!bfd_link_executable (info
))
2458 /* If there are no references to this symbol that do not use the
2459 GOT, we don't need to generate a copy reloc. */
2460 if (!h
->non_got_ref
)
2463 /* If -z nocopyreloc was given, we won't generate them either. */
2464 if (info
->nocopyreloc
)
2470 if (ELIMINATE_COPY_RELOCS
)
2472 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2473 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2475 s
= p
->sec
->output_section
;
2476 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2480 /* If we didn't find any dynamic relocs in read-only sections, then
2481 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2489 /* We must allocate the symbol in our .dynbss section, which will
2490 become part of the .bss section of the executable. There will be
2491 an entry for this symbol in the .dynsym section. The dynamic
2492 object will contain position independent code, so all references
2493 from the dynamic object to this symbol will go through the global
2494 offset table. The dynamic linker will use the .dynsym entry to
2495 determine the address it must put in the global offset table, so
2496 both the dynamic object and the regular object will refer to the
2497 same memory location for the variable. */
2499 htab
= elf_x86_64_hash_table (info
);
2503 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2504 to copy the initial value out of the dynamic object and into the
2505 runtime process image. */
2506 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2508 const struct elf_backend_data
*bed
;
2509 bed
= get_elf_backend_data (info
->output_bfd
);
2510 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2516 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
2519 /* Allocate space in .plt, .got and associated reloc sections for
2523 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2525 struct bfd_link_info
*info
;
2526 struct elf_x86_64_link_hash_table
*htab
;
2527 struct elf_x86_64_link_hash_entry
*eh
;
2528 struct elf_dyn_relocs
*p
;
2529 const struct elf_backend_data
*bed
;
2530 unsigned int plt_entry_size
;
2532 if (h
->root
.type
== bfd_link_hash_indirect
)
2535 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2537 info
= (struct bfd_link_info
*) inf
;
2538 htab
= elf_x86_64_hash_table (info
);
2541 bed
= get_elf_backend_data (info
->output_bfd
);
2542 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2544 /* We can't use the GOT PLT if pointer equality is needed since
2545 finish_dynamic_symbol won't clear symbol value and the dynamic
2546 linker won't update the GOT slot. We will get into an infinite
2547 loop at run-time. */
2548 if (htab
->plt_got
!= NULL
2549 && h
->type
!= STT_GNU_IFUNC
2550 && !h
->pointer_equality_needed
2551 && h
->plt
.refcount
> 0
2552 && h
->got
.refcount
> 0)
2554 /* Don't use the regular PLT if there are both GOT and GOTPLT
2556 h
->plt
.offset
= (bfd_vma
) -1;
2558 /* Use the GOT PLT. */
2559 eh
->plt_got
.refcount
= 1;
2562 /* Clear the reference count of function pointer relocations if
2563 symbol isn't a normal function. */
2564 if (h
->type
!= STT_FUNC
)
2565 eh
->func_pointer_refcount
= 0;
2567 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2568 here if it is defined and referenced in a non-shared object. */
2569 if (h
->type
== STT_GNU_IFUNC
2572 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2578 asection
*s
= htab
->plt_bnd
;
2579 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
2581 /* Use the .plt.bnd section if it is created. */
2582 eh
->plt_bnd
.offset
= s
->size
;
2584 /* Make room for this entry in the .plt.bnd section. */
2585 s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2593 /* Don't create the PLT entry if there are only function pointer
2594 relocations which can be resolved at run-time. */
2595 else if (htab
->elf
.dynamic_sections_created
2596 && (h
->plt
.refcount
> eh
->func_pointer_refcount
2597 || eh
->plt_got
.refcount
> 0))
2599 bfd_boolean use_plt_got
;
2601 /* Clear the reference count of function pointer relocations
2603 eh
->func_pointer_refcount
= 0;
2605 if ((info
->flags
& DF_BIND_NOW
) && !h
->pointer_equality_needed
)
2607 /* Don't use the regular PLT for DF_BIND_NOW. */
2608 h
->plt
.offset
= (bfd_vma
) -1;
2610 /* Use the GOT PLT. */
2611 h
->got
.refcount
= 1;
2612 eh
->plt_got
.refcount
= 1;
2615 use_plt_got
= eh
->plt_got
.refcount
> 0;
2617 /* Make sure this symbol is output as a dynamic symbol.
2618 Undefined weak syms won't yet be marked as dynamic. */
2619 if (h
->dynindx
== -1
2620 && !h
->forced_local
)
2622 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2626 if (bfd_link_pic (info
)
2627 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2629 asection
*s
= htab
->elf
.splt
;
2630 asection
*bnd_s
= htab
->plt_bnd
;
2631 asection
*got_s
= htab
->plt_got
;
2633 /* If this is the first .plt entry, make room for the special
2634 first entry. The .plt section is used by prelink to undo
2635 prelinking for dynamic relocations. */
2637 s
->size
= plt_entry_size
;
2640 eh
->plt_got
.offset
= got_s
->size
;
2643 h
->plt
.offset
= s
->size
;
2645 eh
->plt_bnd
.offset
= bnd_s
->size
;
2648 /* If this symbol is not defined in a regular file, and we are
2649 not generating a shared library, then set the symbol to this
2650 location in the .plt. This is required to make function
2651 pointers compare as equal between the normal executable and
2652 the shared library. */
2653 if (! bfd_link_pic (info
)
2658 /* We need to make a call to the entry of the GOT PLT
2659 instead of regular PLT entry. */
2660 h
->root
.u
.def
.section
= got_s
;
2661 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
2667 /* We need to make a call to the entry of the second
2668 PLT instead of regular PLT entry. */
2669 h
->root
.u
.def
.section
= bnd_s
;
2670 h
->root
.u
.def
.value
= eh
->plt_bnd
.offset
;
2674 h
->root
.u
.def
.section
= s
;
2675 h
->root
.u
.def
.value
= h
->plt
.offset
;
2680 /* Make room for this entry. */
2682 got_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2685 s
->size
+= plt_entry_size
;
2687 bnd_s
->size
+= sizeof (elf_x86_64_legacy_plt2_entry
);
2689 /* We also need to make an entry in the .got.plt section,
2690 which will be placed in the .got section by the linker
2692 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2694 /* We also need to make an entry in the .rela.plt
2696 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2697 htab
->elf
.srelplt
->reloc_count
++;
2702 h
->plt
.offset
= (bfd_vma
) -1;
2708 h
->plt
.offset
= (bfd_vma
) -1;
2712 eh
->tlsdesc_got
= (bfd_vma
) -1;
2714 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2715 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2716 if (h
->got
.refcount
> 0
2717 && bfd_link_executable (info
)
2719 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2721 h
->got
.offset
= (bfd_vma
) -1;
2723 else if (h
->got
.refcount
> 0)
2727 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2729 /* Make sure this symbol is output as a dynamic symbol.
2730 Undefined weak syms won't yet be marked as dynamic. */
2731 if (h
->dynindx
== -1
2732 && !h
->forced_local
)
2734 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2738 if (GOT_TLS_GDESC_P (tls_type
))
2740 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2741 - elf_x86_64_compute_jump_table_size (htab
);
2742 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2743 h
->got
.offset
= (bfd_vma
) -2;
2745 if (! GOT_TLS_GDESC_P (tls_type
)
2746 || GOT_TLS_GD_P (tls_type
))
2749 h
->got
.offset
= s
->size
;
2750 s
->size
+= GOT_ENTRY_SIZE
;
2751 if (GOT_TLS_GD_P (tls_type
))
2752 s
->size
+= GOT_ENTRY_SIZE
;
2754 dyn
= htab
->elf
.dynamic_sections_created
;
2755 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2757 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2758 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2759 || tls_type
== GOT_TLS_IE
)
2760 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2761 else if (GOT_TLS_GD_P (tls_type
))
2762 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2763 else if (! GOT_TLS_GDESC_P (tls_type
)
2764 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2765 || h
->root
.type
!= bfd_link_hash_undefweak
)
2766 && (bfd_link_pic (info
)
2767 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2768 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2769 if (GOT_TLS_GDESC_P (tls_type
))
2771 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2772 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2776 h
->got
.offset
= (bfd_vma
) -1;
2778 if (eh
->dyn_relocs
== NULL
)
2781 /* In the shared -Bsymbolic case, discard space allocated for
2782 dynamic pc-relative relocs against symbols which turn out to be
2783 defined in regular objects. For the normal shared case, discard
2784 space for pc-relative relocs that have become local due to symbol
2785 visibility changes. */
2787 if (bfd_link_pic (info
))
2789 /* Relocs that use pc_count are those that appear on a call
2790 insn, or certain REL relocs that can generated via assembly.
2791 We want calls to protected symbols to resolve directly to the
2792 function rather than going via the plt. If people want
2793 function pointer comparisons to work as expected then they
2794 should avoid writing weird assembly. */
2795 if (SYMBOL_CALLS_LOCAL (info
, h
))
2797 struct elf_dyn_relocs
**pp
;
2799 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2801 p
->count
-= p
->pc_count
;
2810 /* Also discard relocs on undefined weak syms with non-default
2812 if (eh
->dyn_relocs
!= NULL
)
2814 if (h
->root
.type
== bfd_link_hash_undefweak
)
2816 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2817 eh
->dyn_relocs
= NULL
;
2819 /* Make sure undefined weak symbols are output as a dynamic
2821 else if (h
->dynindx
== -1
2822 && ! h
->forced_local
2823 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2826 /* For PIE, discard space for pc-relative relocs against
2827 symbols which turn out to need copy relocs. */
2828 else if (bfd_link_executable (info
)
2829 && (h
->needs_copy
|| eh
->needs_copy
)
2833 struct elf_dyn_relocs
**pp
;
2835 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2837 if (p
->pc_count
!= 0)
2845 else if (ELIMINATE_COPY_RELOCS
)
2847 /* For the non-shared case, discard space for relocs against
2848 symbols which turn out to need copy relocs or are not
2849 dynamic. Keep dynamic relocations for run-time function
2850 pointer initialization. */
2852 if ((!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
2855 || (htab
->elf
.dynamic_sections_created
2856 && (h
->root
.type
== bfd_link_hash_undefweak
2857 || h
->root
.type
== bfd_link_hash_undefined
))))
2859 /* Make sure this symbol is output as a dynamic symbol.
2860 Undefined weak syms won't yet be marked as dynamic. */
2861 if (h
->dynindx
== -1
2862 && ! h
->forced_local
2863 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2866 /* If that succeeded, we know we'll be keeping all the
2868 if (h
->dynindx
!= -1)
2872 eh
->dyn_relocs
= NULL
;
2873 eh
->func_pointer_refcount
= 0;
2878 /* Finally, allocate space. */
2879 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2883 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2885 BFD_ASSERT (sreloc
!= NULL
);
2887 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2893 /* Allocate space in .plt, .got and associated reloc sections for
2894 local dynamic relocs. */
2897 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2899 struct elf_link_hash_entry
*h
2900 = (struct elf_link_hash_entry
*) *slot
;
2902 if (h
->type
!= STT_GNU_IFUNC
2906 || h
->root
.type
!= bfd_link_hash_defined
)
2909 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2912 /* Find any dynamic relocs that apply to read-only sections. */
2915 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2918 struct elf_x86_64_link_hash_entry
*eh
;
2919 struct elf_dyn_relocs
*p
;
2921 /* Skip local IFUNC symbols. */
2922 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2925 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2926 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2928 asection
*s
= p
->sec
->output_section
;
2930 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2932 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2934 info
->flags
|= DF_TEXTREL
;
2936 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
2937 || info
->error_textrel
)
2938 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2939 p
->sec
->owner
, h
->root
.root
.string
,
2942 /* Not an error, just cut short the traversal. */
2950 mov foo@GOTPCREL(%rip), %reg
2953 with the local symbol, foo. */
2956 elf_x86_64_convert_mov_to_lea (bfd
*abfd
, asection
*sec
,
2957 struct bfd_link_info
*link_info
)
2959 Elf_Internal_Shdr
*symtab_hdr
;
2960 Elf_Internal_Rela
*internal_relocs
;
2961 Elf_Internal_Rela
*irel
, *irelend
;
2963 struct elf_x86_64_link_hash_table
*htab
;
2964 bfd_boolean changed_contents
;
2965 bfd_boolean changed_relocs
;
2966 bfd_signed_vma
*local_got_refcounts
;
2967 bfd_vma maxpagesize
;
2969 /* Don't even try to convert non-ELF outputs. */
2970 if (!is_elf_hash_table (link_info
->hash
))
2973 /* Nothing to do if there is no need or no output. */
2974 if ((sec
->flags
& (SEC_CODE
| SEC_RELOC
)) != (SEC_CODE
| SEC_RELOC
)
2975 || sec
->need_convert_mov_to_lea
== 0
2976 || bfd_is_abs_section (sec
->output_section
))
2979 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2981 /* Load the relocations for this section. */
2982 internal_relocs
= (_bfd_elf_link_read_relocs
2983 (abfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
2984 link_info
->keep_memory
));
2985 if (internal_relocs
== NULL
)
2988 htab
= elf_x86_64_hash_table (link_info
);
2989 changed_contents
= FALSE
;
2990 changed_relocs
= FALSE
;
2991 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2992 maxpagesize
= get_elf_backend_data (abfd
)->maxpagesize
;
2994 /* Get the section contents. */
2995 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
2996 contents
= elf_section_data (sec
)->this_hdr
.contents
;
2999 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
3003 irelend
= internal_relocs
+ sec
->reloc_count
;
3004 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
3006 unsigned int r_type
= ELF32_R_TYPE (irel
->r_info
);
3007 unsigned int r_symndx
= htab
->r_sym (irel
->r_info
);
3009 struct elf_link_hash_entry
*h
;
3015 } convert_mov_to_lea
;
3016 unsigned int opcode
;
3018 if (r_type
!= R_X86_64_GOTPCREL
)
3021 roff
= irel
->r_offset
;
3026 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
3028 /* PR ld/18591: Don't convert R_X86_64_GOTPCREL relocation if it
3029 isn't for mov instruction. */
3034 convert_mov_to_lea
= none
;
3036 /* Get the symbol referred to by the reloc. */
3037 if (r_symndx
< symtab_hdr
->sh_info
)
3039 Elf_Internal_Sym
*isym
;
3041 /* Silence older GCC warning. */
3044 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
3047 symtype
= ELF_ST_TYPE (isym
->st_info
);
3049 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation and
3050 skip relocation against undefined symbols. */
3051 if (symtype
!= STT_GNU_IFUNC
&& isym
->st_shndx
!= SHN_UNDEF
)
3053 if (isym
->st_shndx
== SHN_ABS
)
3054 tsec
= bfd_abs_section_ptr
;
3055 else if (isym
->st_shndx
== SHN_COMMON
)
3056 tsec
= bfd_com_section_ptr
;
3057 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
3058 tsec
= &_bfd_elf_large_com_section
;
3060 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3062 toff
= isym
->st_value
;
3063 convert_mov_to_lea
= local
;
3068 indx
= r_symndx
- symtab_hdr
->sh_info
;
3069 h
= elf_sym_hashes (abfd
)[indx
];
3070 BFD_ASSERT (h
!= NULL
);
3072 while (h
->root
.type
== bfd_link_hash_indirect
3073 || h
->root
.type
== bfd_link_hash_warning
)
3074 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3076 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
3077 avoid optimizing _DYNAMIC since ld.so may use its link-time
3080 && h
->type
!= STT_GNU_IFUNC
3081 && h
!= htab
->elf
.hdynamic
3082 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3084 tsec
= h
->root
.u
.def
.section
;
3085 toff
= h
->root
.u
.def
.value
;
3087 convert_mov_to_lea
= global
;
3091 if (convert_mov_to_lea
== none
)
3094 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3096 /* At this stage in linking, no SEC_MERGE symbol has been
3097 adjusted, so all references to such symbols need to be
3098 passed through _bfd_merged_section_offset. (Later, in
3099 relocate_section, all SEC_MERGE symbols *except* for
3100 section symbols have been adjusted.)
3102 gas may reduce relocations against symbols in SEC_MERGE
3103 sections to a relocation against the section symbol when
3104 the original addend was zero. When the reloc is against
3105 a section symbol we should include the addend in the
3106 offset passed to _bfd_merged_section_offset, since the
3107 location of interest is the original symbol. On the
3108 other hand, an access to "sym+addend" where "sym" is not
3109 a section symbol should not include the addend; Such an
3110 access is presumed to be an offset from "sym"; The
3111 location of interest is just "sym". */
3112 if (symtype
== STT_SECTION
)
3113 toff
+= irel
->r_addend
;
3115 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3116 elf_section_data (tsec
)->sec_info
,
3119 if (symtype
!= STT_SECTION
)
3120 toff
+= irel
->r_addend
;
3123 toff
+= irel
->r_addend
;
3125 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3126 if (tsec
->output_section
== sec
->output_section
)
3128 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3136 /* At this point, we don't know the load addresses of TSEC
3137 section nor SEC section. We estimate the distrance between
3140 for (asect
= sec
->output_section
;
3141 asect
!= NULL
&& asect
!= tsec
->output_section
;
3142 asect
= asect
->next
)
3145 for (i
= asect
->output_section
->map_head
.s
;
3149 size
= align_power (size
, i
->alignment_power
);
3154 /* Don't convert R_X86_64_GOTPCREL if TSEC isn't placed after
3159 /* Take PT_GNU_RELRO segment into account by adding
3161 if ((toff
+ size
+ maxpagesize
- roff
+ 0x80000000)
3166 bfd_put_8 (abfd
, 0x8d, contents
+ roff
- 2);
3167 irel
->r_info
= htab
->r_info (r_symndx
, R_X86_64_PC32
);
3168 changed_contents
= TRUE
;
3169 changed_relocs
= TRUE
;
3171 if (convert_mov_to_lea
== local
)
3173 if (local_got_refcounts
!= NULL
3174 && local_got_refcounts
[r_symndx
] > 0)
3175 local_got_refcounts
[r_symndx
] -= 1;
3179 if (h
->got
.refcount
> 0)
3180 h
->got
.refcount
-= 1;
3184 if (contents
!= NULL
3185 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3187 if (!changed_contents
&& !link_info
->keep_memory
)
3191 /* Cache the section contents for elf_link_input_bfd. */
3192 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3196 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3198 if (!changed_relocs
)
3199 free (internal_relocs
);
3201 elf_section_data (sec
)->relocs
= internal_relocs
;
3207 if (contents
!= NULL
3208 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3210 if (internal_relocs
!= NULL
3211 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3212 free (internal_relocs
);
3216 /* Set the sizes of the dynamic sections. */
3219 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3220 struct bfd_link_info
*info
)
3222 struct elf_x86_64_link_hash_table
*htab
;
3227 const struct elf_backend_data
*bed
;
3229 htab
= elf_x86_64_hash_table (info
);
3232 bed
= get_elf_backend_data (output_bfd
);
3234 dynobj
= htab
->elf
.dynobj
;
3238 if (htab
->elf
.dynamic_sections_created
)
3240 /* Set the contents of the .interp section to the interpreter. */
3241 if (bfd_link_executable (info
))
3243 s
= bfd_get_linker_section (dynobj
, ".interp");
3246 s
->size
= htab
->dynamic_interpreter_size
;
3247 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3251 /* Set up .got offsets for local syms, and space for local dynamic
3253 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3255 bfd_signed_vma
*local_got
;
3256 bfd_signed_vma
*end_local_got
;
3257 char *local_tls_type
;
3258 bfd_vma
*local_tlsdesc_gotent
;
3259 bfd_size_type locsymcount
;
3260 Elf_Internal_Shdr
*symtab_hdr
;
3263 if (! is_x86_64_elf (ibfd
))
3266 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3268 struct elf_dyn_relocs
*p
;
3270 if (!elf_x86_64_convert_mov_to_lea (ibfd
, s
, info
))
3273 for (p
= (struct elf_dyn_relocs
*)
3274 (elf_section_data (s
)->local_dynrel
);
3278 if (!bfd_is_abs_section (p
->sec
)
3279 && bfd_is_abs_section (p
->sec
->output_section
))
3281 /* Input section has been discarded, either because
3282 it is a copy of a linkonce section or due to
3283 linker script /DISCARD/, so we'll be discarding
3286 else if (p
->count
!= 0)
3288 srel
= elf_section_data (p
->sec
)->sreloc
;
3289 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3290 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3291 && (info
->flags
& DF_TEXTREL
) == 0)
3293 info
->flags
|= DF_TEXTREL
;
3294 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3295 || info
->error_textrel
)
3296 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3297 p
->sec
->owner
, p
->sec
);
3303 local_got
= elf_local_got_refcounts (ibfd
);
3307 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3308 locsymcount
= symtab_hdr
->sh_info
;
3309 end_local_got
= local_got
+ locsymcount
;
3310 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3311 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3313 srel
= htab
->elf
.srelgot
;
3314 for (; local_got
< end_local_got
;
3315 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3317 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3320 if (GOT_TLS_GDESC_P (*local_tls_type
))
3322 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3323 - elf_x86_64_compute_jump_table_size (htab
);
3324 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3325 *local_got
= (bfd_vma
) -2;
3327 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3328 || GOT_TLS_GD_P (*local_tls_type
))
3330 *local_got
= s
->size
;
3331 s
->size
+= GOT_ENTRY_SIZE
;
3332 if (GOT_TLS_GD_P (*local_tls_type
))
3333 s
->size
+= GOT_ENTRY_SIZE
;
3335 if (bfd_link_pic (info
)
3336 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3337 || *local_tls_type
== GOT_TLS_IE
)
3339 if (GOT_TLS_GDESC_P (*local_tls_type
))
3341 htab
->elf
.srelplt
->size
3342 += bed
->s
->sizeof_rela
;
3343 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3345 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3346 || GOT_TLS_GD_P (*local_tls_type
))
3347 srel
->size
+= bed
->s
->sizeof_rela
;
3351 *local_got
= (bfd_vma
) -1;
3355 if (htab
->tls_ld_got
.refcount
> 0)
3357 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3359 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3360 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3361 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3364 htab
->tls_ld_got
.offset
= -1;
3366 /* Allocate global sym .plt and .got entries, and space for global
3367 sym dynamic relocs. */
3368 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3371 /* Allocate .plt and .got entries, and space for local symbols. */
3372 htab_traverse (htab
->loc_hash_table
,
3373 elf_x86_64_allocate_local_dynrelocs
,
3376 /* For every jump slot reserved in the sgotplt, reloc_count is
3377 incremented. However, when we reserve space for TLS descriptors,
3378 it's not incremented, so in order to compute the space reserved
3379 for them, it suffices to multiply the reloc count by the jump
3382 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3383 so that R_X86_64_IRELATIVE entries come last. */
3384 if (htab
->elf
.srelplt
)
3386 htab
->sgotplt_jump_table_size
3387 = elf_x86_64_compute_jump_table_size (htab
);
3388 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3390 else if (htab
->elf
.irelplt
)
3391 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3393 if (htab
->tlsdesc_plt
)
3395 /* If we're not using lazy TLS relocations, don't generate the
3396 PLT and GOT entries they require. */
3397 if ((info
->flags
& DF_BIND_NOW
))
3398 htab
->tlsdesc_plt
= 0;
3401 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3402 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3403 /* Reserve room for the initial entry.
3404 FIXME: we could probably do away with it in this case. */
3405 if (htab
->elf
.splt
->size
== 0)
3406 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3407 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3408 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3412 if (htab
->elf
.sgotplt
)
3414 /* Don't allocate .got.plt section if there are no GOT nor PLT
3415 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3416 if ((htab
->elf
.hgot
== NULL
3417 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3418 && (htab
->elf
.sgotplt
->size
3419 == get_elf_backend_data (output_bfd
)->got_header_size
)
3420 && (htab
->elf
.splt
== NULL
3421 || htab
->elf
.splt
->size
== 0)
3422 && (htab
->elf
.sgot
== NULL
3423 || htab
->elf
.sgot
->size
== 0)
3424 && (htab
->elf
.iplt
== NULL
3425 || htab
->elf
.iplt
->size
== 0)
3426 && (htab
->elf
.igotplt
== NULL
3427 || htab
->elf
.igotplt
->size
== 0))
3428 htab
->elf
.sgotplt
->size
= 0;
3431 if (htab
->plt_eh_frame
!= NULL
3432 && htab
->elf
.splt
!= NULL
3433 && htab
->elf
.splt
->size
!= 0
3434 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3435 && _bfd_elf_eh_frame_present (info
))
3437 const struct elf_x86_64_backend_data
*arch_data
3438 = get_elf_x86_64_arch_data (bed
);
3439 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3442 /* We now have determined the sizes of the various dynamic sections.
3443 Allocate memory for them. */
3445 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3447 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3450 if (s
== htab
->elf
.splt
3451 || s
== htab
->elf
.sgot
3452 || s
== htab
->elf
.sgotplt
3453 || s
== htab
->elf
.iplt
3454 || s
== htab
->elf
.igotplt
3455 || s
== htab
->plt_bnd
3456 || s
== htab
->plt_got
3457 || s
== htab
->plt_eh_frame
3458 || s
== htab
->sdynbss
)
3460 /* Strip this section if we don't need it; see the
3463 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3465 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3468 /* We use the reloc_count field as a counter if we need
3469 to copy relocs into the output file. */
3470 if (s
!= htab
->elf
.srelplt
)
3475 /* It's not one of our sections, so don't allocate space. */
3481 /* If we don't need this section, strip it from the
3482 output file. This is mostly to handle .rela.bss and
3483 .rela.plt. We must create both sections in
3484 create_dynamic_sections, because they must be created
3485 before the linker maps input sections to output
3486 sections. The linker does that before
3487 adjust_dynamic_symbol is called, and it is that
3488 function which decides whether anything needs to go
3489 into these sections. */
3491 s
->flags
|= SEC_EXCLUDE
;
3495 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3498 /* Allocate memory for the section contents. We use bfd_zalloc
3499 here in case unused entries are not reclaimed before the
3500 section's contents are written out. This should not happen,
3501 but this way if it does, we get a R_X86_64_NONE reloc instead
3503 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3504 if (s
->contents
== NULL
)
3508 if (htab
->plt_eh_frame
!= NULL
3509 && htab
->plt_eh_frame
->contents
!= NULL
)
3511 const struct elf_x86_64_backend_data
*arch_data
3512 = get_elf_x86_64_arch_data (bed
);
3514 memcpy (htab
->plt_eh_frame
->contents
,
3515 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3516 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3517 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3520 if (htab
->elf
.dynamic_sections_created
)
3522 /* Add some entries to the .dynamic section. We fill in the
3523 values later, in elf_x86_64_finish_dynamic_sections, but we
3524 must add the entries now so that we get the correct size for
3525 the .dynamic section. The DT_DEBUG entry is filled in by the
3526 dynamic linker and used by the debugger. */
3527 #define add_dynamic_entry(TAG, VAL) \
3528 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3530 if (bfd_link_executable (info
))
3532 if (!add_dynamic_entry (DT_DEBUG
, 0))
3536 if (htab
->elf
.splt
->size
!= 0)
3538 /* DT_PLTGOT is used by prelink even if there is no PLT
3540 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3543 if (htab
->elf
.srelplt
->size
!= 0)
3545 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3546 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3547 || !add_dynamic_entry (DT_JMPREL
, 0))
3551 if (htab
->tlsdesc_plt
3552 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3553 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3559 if (!add_dynamic_entry (DT_RELA
, 0)
3560 || !add_dynamic_entry (DT_RELASZ
, 0)
3561 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3564 /* If any dynamic relocs apply to a read-only section,
3565 then we need a DT_TEXTREL entry. */
3566 if ((info
->flags
& DF_TEXTREL
) == 0)
3567 elf_link_hash_traverse (&htab
->elf
,
3568 elf_x86_64_readonly_dynrelocs
,
3571 if ((info
->flags
& DF_TEXTREL
) != 0)
3573 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3574 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3576 info
->callbacks
->einfo
3577 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3578 bfd_set_error (bfd_error_bad_value
);
3582 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3587 #undef add_dynamic_entry
3593 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3594 struct bfd_link_info
*info
)
3596 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3600 struct elf_link_hash_entry
*tlsbase
;
3602 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3603 "_TLS_MODULE_BASE_",
3604 FALSE
, FALSE
, FALSE
);
3606 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3608 struct elf_x86_64_link_hash_table
*htab
;
3609 struct bfd_link_hash_entry
*bh
= NULL
;
3610 const struct elf_backend_data
*bed
3611 = get_elf_backend_data (output_bfd
);
3613 htab
= elf_x86_64_hash_table (info
);
3617 if (!(_bfd_generic_link_add_one_symbol
3618 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3619 tls_sec
, 0, NULL
, FALSE
,
3620 bed
->collect
, &bh
)))
3623 htab
->tls_module_base
= bh
;
3625 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3626 tlsbase
->def_regular
= 1;
3627 tlsbase
->other
= STV_HIDDEN
;
3628 tlsbase
->root
.linker_def
= 1;
3629 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3636 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3637 executables. Rather than setting it to the beginning of the TLS
3638 section, we have to set it to the end. This function may be called
3639 multiple times, it is idempotent. */
3642 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3644 struct elf_x86_64_link_hash_table
*htab
;
3645 struct bfd_link_hash_entry
*base
;
3647 if (!bfd_link_executable (info
))
3650 htab
= elf_x86_64_hash_table (info
);
3654 base
= htab
->tls_module_base
;
3658 base
->u
.def
.value
= htab
->elf
.tls_size
;
3661 /* Return the base VMA address which should be subtracted from real addresses
3662 when resolving @dtpoff relocation.
3663 This is PT_TLS segment p_vaddr. */
3666 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3668 /* If tls_sec is NULL, we should have signalled an error already. */
3669 if (elf_hash_table (info
)->tls_sec
== NULL
)
3671 return elf_hash_table (info
)->tls_sec
->vma
;
3674 /* Return the relocation value for @tpoff relocation
3675 if STT_TLS virtual address is ADDRESS. */
3678 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3680 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3681 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3682 bfd_vma static_tls_size
;
3684 /* If tls_segment is NULL, we should have signalled an error already. */
3685 if (htab
->tls_sec
== NULL
)
3688 /* Consider special static TLS alignment requirements. */
3689 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3690 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3693 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3697 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3699 /* Opcode Instruction
3702 0x0f 0x8x conditional jump */
3704 && (contents
[offset
- 1] == 0xe8
3705 || contents
[offset
- 1] == 0xe9))
3707 && contents
[offset
- 2] == 0x0f
3708 && (contents
[offset
- 1] & 0xf0) == 0x80));
3711 /* Relocate an x86_64 ELF section. */
3714 elf_x86_64_relocate_section (bfd
*output_bfd
,
3715 struct bfd_link_info
*info
,
3717 asection
*input_section
,
3719 Elf_Internal_Rela
*relocs
,
3720 Elf_Internal_Sym
*local_syms
,
3721 asection
**local_sections
)
3723 struct elf_x86_64_link_hash_table
*htab
;
3724 Elf_Internal_Shdr
*symtab_hdr
;
3725 struct elf_link_hash_entry
**sym_hashes
;
3726 bfd_vma
*local_got_offsets
;
3727 bfd_vma
*local_tlsdesc_gotents
;
3728 Elf_Internal_Rela
*rel
;
3729 Elf_Internal_Rela
*relend
;
3730 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3732 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3734 htab
= elf_x86_64_hash_table (info
);
3737 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3738 sym_hashes
= elf_sym_hashes (input_bfd
);
3739 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3740 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3742 elf_x86_64_set_tls_module_base (info
);
3745 relend
= relocs
+ input_section
->reloc_count
;
3746 for (; rel
< relend
; rel
++)
3748 unsigned int r_type
;
3749 reloc_howto_type
*howto
;
3750 unsigned long r_symndx
;
3751 struct elf_link_hash_entry
*h
;
3752 struct elf_x86_64_link_hash_entry
*eh
;
3753 Elf_Internal_Sym
*sym
;
3755 bfd_vma off
, offplt
, plt_offset
;
3757 bfd_boolean unresolved_reloc
;
3758 bfd_reloc_status_type r
;
3760 asection
*base_got
, *resolved_plt
;
3763 r_type
= ELF32_R_TYPE (rel
->r_info
);
3764 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3765 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3768 if (r_type
>= (int) R_X86_64_standard
)
3770 (*_bfd_error_handler
)
3771 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3772 input_bfd
, input_section
, r_type
);
3773 bfd_set_error (bfd_error_bad_value
);
3777 if (r_type
!= (int) R_X86_64_32
3778 || ABI_64_P (output_bfd
))
3779 howto
= x86_64_elf_howto_table
+ r_type
;
3781 howto
= (x86_64_elf_howto_table
3782 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3783 r_symndx
= htab
->r_sym (rel
->r_info
);
3787 unresolved_reloc
= FALSE
;
3788 if (r_symndx
< symtab_hdr
->sh_info
)
3790 sym
= local_syms
+ r_symndx
;
3791 sec
= local_sections
[r_symndx
];
3793 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3795 st_size
= sym
->st_size
;
3797 /* Relocate against local STT_GNU_IFUNC symbol. */
3798 if (!bfd_link_relocatable (info
)
3799 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3801 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3806 /* Set STT_GNU_IFUNC symbol value. */
3807 h
->root
.u
.def
.value
= sym
->st_value
;
3808 h
->root
.u
.def
.section
= sec
;
3813 bfd_boolean warned ATTRIBUTE_UNUSED
;
3814 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3816 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3817 r_symndx
, symtab_hdr
, sym_hashes
,
3819 unresolved_reloc
, warned
, ignored
);
3823 if (sec
!= NULL
&& discarded_section (sec
))
3824 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3825 rel
, 1, relend
, howto
, 0, contents
);
3827 if (bfd_link_relocatable (info
))
3830 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
3832 if (r_type
== R_X86_64_64
)
3834 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3835 zero-extend it to 64bit if addend is zero. */
3836 r_type
= R_X86_64_32
;
3837 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3839 else if (r_type
== R_X86_64_SIZE64
)
3841 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3842 zero-extend it to 64bit if addend is zero. */
3843 r_type
= R_X86_64_SIZE32
;
3844 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3848 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3850 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3851 it here if it is defined in a non-shared object. */
3853 && h
->type
== STT_GNU_IFUNC
3859 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3861 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3862 sections because such sections are not SEC_ALLOC and
3863 thus ld.so will not process them. */
3864 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
3868 else if (h
->plt
.offset
== (bfd_vma
) -1)
3871 /* STT_GNU_IFUNC symbol must go through PLT. */
3872 if (htab
->elf
.splt
!= NULL
)
3874 if (htab
->plt_bnd
!= NULL
)
3876 resolved_plt
= htab
->plt_bnd
;
3877 plt_offset
= eh
->plt_bnd
.offset
;
3881 resolved_plt
= htab
->elf
.splt
;
3882 plt_offset
= h
->plt
.offset
;
3887 resolved_plt
= htab
->elf
.iplt
;
3888 plt_offset
= h
->plt
.offset
;
3891 relocation
= (resolved_plt
->output_section
->vma
3892 + resolved_plt
->output_offset
+ plt_offset
);
3897 if (h
->root
.root
.string
)
3898 name
= h
->root
.root
.string
;
3900 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3902 (*_bfd_error_handler
)
3903 (_("%B: relocation %s against STT_GNU_IFUNC "
3904 "symbol `%s' isn't handled by %s"), input_bfd
,
3905 x86_64_elf_howto_table
[r_type
].name
,
3906 name
, __FUNCTION__
);
3907 bfd_set_error (bfd_error_bad_value
);
3911 if (bfd_link_pic (info
))
3916 if (ABI_64_P (output_bfd
))
3920 if (rel
->r_addend
!= 0)
3922 if (h
->root
.root
.string
)
3923 name
= h
->root
.root
.string
;
3925 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3927 (*_bfd_error_handler
)
3928 (_("%B: relocation %s against STT_GNU_IFUNC "
3929 "symbol `%s' has non-zero addend: %d"),
3930 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
3931 name
, rel
->r_addend
);
3932 bfd_set_error (bfd_error_bad_value
);
3936 /* Generate dynamic relcoation only when there is a
3937 non-GOT reference in a shared object. */
3938 if (bfd_link_pic (info
) && h
->non_got_ref
)
3940 Elf_Internal_Rela outrel
;
3943 /* Need a dynamic relocation to get the real function
3945 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
3949 if (outrel
.r_offset
== (bfd_vma
) -1
3950 || outrel
.r_offset
== (bfd_vma
) -2)
3953 outrel
.r_offset
+= (input_section
->output_section
->vma
3954 + input_section
->output_offset
);
3956 if (h
->dynindx
== -1
3958 || bfd_link_executable (info
))
3960 /* This symbol is resolved locally. */
3961 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3962 outrel
.r_addend
= (h
->root
.u
.def
.value
3963 + h
->root
.u
.def
.section
->output_section
->vma
3964 + h
->root
.u
.def
.section
->output_offset
);
3968 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3969 outrel
.r_addend
= 0;
3972 sreloc
= htab
->elf
.irelifunc
;
3973 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3975 /* If this reloc is against an external symbol, we
3976 do not want to fiddle with the addend. Otherwise,
3977 we need to include the symbol value so that it
3978 becomes an addend for the dynamic reloc. For an
3979 internal symbol, we have updated addend. */
3984 case R_X86_64_PC32_BND
:
3986 case R_X86_64_PLT32
:
3987 case R_X86_64_PLT32_BND
:
3990 case R_X86_64_GOTPCREL
:
3991 case R_X86_64_GOTPCREL64
:
3992 base_got
= htab
->elf
.sgot
;
3993 off
= h
->got
.offset
;
3995 if (base_got
== NULL
)
3998 if (off
== (bfd_vma
) -1)
4000 /* We can't use h->got.offset here to save state, or
4001 even just remember the offset, as finish_dynamic_symbol
4002 would use that as offset into .got. */
4004 if (htab
->elf
.splt
!= NULL
)
4006 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4007 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4008 base_got
= htab
->elf
.sgotplt
;
4012 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4013 off
= plt_index
* GOT_ENTRY_SIZE
;
4014 base_got
= htab
->elf
.igotplt
;
4017 if (h
->dynindx
== -1
4021 /* This references the local defitionion. We must
4022 initialize this entry in the global offset table.
4023 Since the offset must always be a multiple of 8,
4024 we use the least significant bit to record
4025 whether we have initialized it already.
4027 When doing a dynamic link, we create a .rela.got
4028 relocation entry to initialize the value. This
4029 is done in the finish_dynamic_symbol routine. */
4034 bfd_put_64 (output_bfd
, relocation
,
4035 base_got
->contents
+ off
);
4036 /* Note that this is harmless for the GOTPLT64
4037 case, as -1 | 1 still is -1. */
4043 relocation
= (base_got
->output_section
->vma
4044 + base_got
->output_offset
+ off
);
4050 /* When generating a shared object, the relocations handled here are
4051 copied into the output file to be resolved at run time. */
4054 case R_X86_64_GOT32
:
4055 case R_X86_64_GOT64
:
4056 /* Relocation is to the entry for this symbol in the global
4058 case R_X86_64_GOTPCREL
:
4059 case R_X86_64_GOTPCREL64
:
4060 /* Use global offset table entry as symbol value. */
4061 case R_X86_64_GOTPLT64
:
4062 /* This is obsolete and treated the the same as GOT64. */
4063 base_got
= htab
->elf
.sgot
;
4065 if (htab
->elf
.sgot
== NULL
)
4072 off
= h
->got
.offset
;
4074 && h
->plt
.offset
!= (bfd_vma
)-1
4075 && off
== (bfd_vma
)-1)
4077 /* We can't use h->got.offset here to save
4078 state, or even just remember the offset, as
4079 finish_dynamic_symbol would use that as offset into
4081 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4082 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4083 base_got
= htab
->elf
.sgotplt
;
4086 dyn
= htab
->elf
.dynamic_sections_created
;
4088 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4089 || (bfd_link_pic (info
)
4090 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4091 || (ELF_ST_VISIBILITY (h
->other
)
4092 && h
->root
.type
== bfd_link_hash_undefweak
))
4094 /* This is actually a static link, or it is a -Bsymbolic
4095 link and the symbol is defined locally, or the symbol
4096 was forced to be local because of a version file. We
4097 must initialize this entry in the global offset table.
4098 Since the offset must always be a multiple of 8, we
4099 use the least significant bit to record whether we
4100 have initialized it already.
4102 When doing a dynamic link, we create a .rela.got
4103 relocation entry to initialize the value. This is
4104 done in the finish_dynamic_symbol routine. */
4109 bfd_put_64 (output_bfd
, relocation
,
4110 base_got
->contents
+ off
);
4111 /* Note that this is harmless for the GOTPLT64 case,
4112 as -1 | 1 still is -1. */
4117 unresolved_reloc
= FALSE
;
4121 if (local_got_offsets
== NULL
)
4124 off
= local_got_offsets
[r_symndx
];
4126 /* The offset must always be a multiple of 8. We use
4127 the least significant bit to record whether we have
4128 already generated the necessary reloc. */
4133 bfd_put_64 (output_bfd
, relocation
,
4134 base_got
->contents
+ off
);
4136 if (bfd_link_pic (info
))
4139 Elf_Internal_Rela outrel
;
4141 /* We need to generate a R_X86_64_RELATIVE reloc
4142 for the dynamic linker. */
4143 s
= htab
->elf
.srelgot
;
4147 outrel
.r_offset
= (base_got
->output_section
->vma
4148 + base_got
->output_offset
4150 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4151 outrel
.r_addend
= relocation
;
4152 elf_append_rela (output_bfd
, s
, &outrel
);
4155 local_got_offsets
[r_symndx
] |= 1;
4159 if (off
>= (bfd_vma
) -2)
4162 relocation
= base_got
->output_section
->vma
4163 + base_got
->output_offset
+ off
;
4164 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
4165 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4166 - htab
->elf
.sgotplt
->output_offset
;
4170 case R_X86_64_GOTOFF64
:
4171 /* Relocation is relative to the start of the global offset
4174 /* Check to make sure it isn't a protected function or data
4175 symbol for shared library since it may not be local when
4176 used as function address or with copy relocation. We also
4177 need to make sure that a symbol is referenced locally. */
4178 if (bfd_link_pic (info
) && h
)
4180 if (!h
->def_regular
)
4184 switch (ELF_ST_VISIBILITY (h
->other
))
4187 v
= _("hidden symbol");
4190 v
= _("internal symbol");
4193 v
= _("protected symbol");
4200 (*_bfd_error_handler
)
4201 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4202 input_bfd
, v
, h
->root
.root
.string
);
4203 bfd_set_error (bfd_error_bad_value
);
4206 else if (!bfd_link_executable (info
)
4207 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4208 && (h
->type
== STT_FUNC
4209 || h
->type
== STT_OBJECT
)
4210 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4212 (*_bfd_error_handler
)
4213 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4215 h
->type
== STT_FUNC
? "function" : "data",
4216 h
->root
.root
.string
);
4217 bfd_set_error (bfd_error_bad_value
);
4222 /* Note that sgot is not involved in this
4223 calculation. We always want the start of .got.plt. If we
4224 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4225 permitted by the ABI, we might have to change this
4227 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4228 + htab
->elf
.sgotplt
->output_offset
;
4231 case R_X86_64_GOTPC32
:
4232 case R_X86_64_GOTPC64
:
4233 /* Use global offset table as symbol value. */
4234 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4235 + htab
->elf
.sgotplt
->output_offset
;
4236 unresolved_reloc
= FALSE
;
4239 case R_X86_64_PLTOFF64
:
4240 /* Relocation is PLT entry relative to GOT. For local
4241 symbols it's the symbol itself relative to GOT. */
4243 /* See PLT32 handling. */
4244 && h
->plt
.offset
!= (bfd_vma
) -1
4245 && htab
->elf
.splt
!= NULL
)
4247 if (htab
->plt_bnd
!= NULL
)
4249 resolved_plt
= htab
->plt_bnd
;
4250 plt_offset
= eh
->plt_bnd
.offset
;
4254 resolved_plt
= htab
->elf
.splt
;
4255 plt_offset
= h
->plt
.offset
;
4258 relocation
= (resolved_plt
->output_section
->vma
4259 + resolved_plt
->output_offset
4261 unresolved_reloc
= FALSE
;
4264 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4265 + htab
->elf
.sgotplt
->output_offset
;
4268 case R_X86_64_PLT32
:
4269 case R_X86_64_PLT32_BND
:
4270 /* Relocation is to the entry for this symbol in the
4271 procedure linkage table. */
4273 /* Resolve a PLT32 reloc against a local symbol directly,
4274 without using the procedure linkage table. */
4278 if ((h
->plt
.offset
== (bfd_vma
) -1
4279 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4280 || htab
->elf
.splt
== NULL
)
4282 /* We didn't make a PLT entry for this symbol. This
4283 happens when statically linking PIC code, or when
4284 using -Bsymbolic. */
4288 if (h
->plt
.offset
!= (bfd_vma
) -1)
4290 if (htab
->plt_bnd
!= NULL
)
4292 resolved_plt
= htab
->plt_bnd
;
4293 plt_offset
= eh
->plt_bnd
.offset
;
4297 resolved_plt
= htab
->elf
.splt
;
4298 plt_offset
= h
->plt
.offset
;
4303 /* Use the GOT PLT. */
4304 resolved_plt
= htab
->plt_got
;
4305 plt_offset
= eh
->plt_got
.offset
;
4308 relocation
= (resolved_plt
->output_section
->vma
4309 + resolved_plt
->output_offset
4311 unresolved_reloc
= FALSE
;
4314 case R_X86_64_SIZE32
:
4315 case R_X86_64_SIZE64
:
4316 /* Set to symbol size. */
4317 relocation
= st_size
;
4323 case R_X86_64_PC32_BND
:
4324 /* Don't complain about -fPIC if the symbol is undefined when
4325 building executable. */
4326 if (bfd_link_pic (info
)
4327 && (input_section
->flags
& SEC_ALLOC
) != 0
4328 && (input_section
->flags
& SEC_READONLY
) != 0
4330 && !(bfd_link_executable (info
)
4331 && h
->root
.type
== bfd_link_hash_undefined
))
4333 bfd_boolean fail
= FALSE
;
4335 = ((r_type
== R_X86_64_PC32
4336 || r_type
== R_X86_64_PC32_BND
)
4337 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4339 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4341 /* Symbol is referenced locally. Make sure it is
4342 defined locally or for a branch. */
4343 fail
= !h
->def_regular
&& !branch
;
4345 else if (!(bfd_link_executable (info
)
4346 && (h
->needs_copy
|| eh
->needs_copy
)))
4348 /* Symbol doesn't need copy reloc and isn't referenced
4349 locally. We only allow branch to symbol with
4350 non-default visibility. */
4352 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4359 const char *pic
= "";
4361 switch (ELF_ST_VISIBILITY (h
->other
))
4364 v
= _("hidden symbol");
4367 v
= _("internal symbol");
4370 v
= _("protected symbol");
4374 pic
= _("; recompile with -fPIC");
4379 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4381 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4383 (*_bfd_error_handler
) (fmt
, input_bfd
,
4384 x86_64_elf_howto_table
[r_type
].name
,
4385 v
, h
->root
.root
.string
, pic
);
4386 bfd_set_error (bfd_error_bad_value
);
4397 /* FIXME: The ABI says the linker should make sure the value is
4398 the same when it's zeroextended to 64 bit. */
4401 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4404 /* Don't copy a pc-relative relocation into the output file
4405 if the symbol needs copy reloc or the symbol is undefined
4406 when building executable. Copy dynamic function pointer
4408 if ((bfd_link_pic (info
)
4409 && !(bfd_link_executable (info
)
4413 || h
->root
.type
== bfd_link_hash_undefined
)
4414 && IS_X86_64_PCREL_TYPE (r_type
))
4416 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4417 || h
->root
.type
!= bfd_link_hash_undefweak
)
4418 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4419 && r_type
!= R_X86_64_SIZE32
4420 && r_type
!= R_X86_64_SIZE64
)
4421 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4422 || (ELIMINATE_COPY_RELOCS
4423 && !bfd_link_pic (info
)
4426 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4429 || h
->root
.type
== bfd_link_hash_undefweak
4430 || h
->root
.type
== bfd_link_hash_undefined
)))
4432 Elf_Internal_Rela outrel
;
4433 bfd_boolean skip
, relocate
;
4436 /* When generating a shared object, these relocations
4437 are copied into the output file to be resolved at run
4443 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4445 if (outrel
.r_offset
== (bfd_vma
) -1)
4447 else if (outrel
.r_offset
== (bfd_vma
) -2)
4448 skip
= TRUE
, relocate
= TRUE
;
4450 outrel
.r_offset
+= (input_section
->output_section
->vma
4451 + input_section
->output_offset
);
4454 memset (&outrel
, 0, sizeof outrel
);
4456 /* h->dynindx may be -1 if this symbol was marked to
4460 && (IS_X86_64_PCREL_TYPE (r_type
)
4461 || ! bfd_link_pic (info
)
4462 || ! SYMBOLIC_BIND (info
, h
)
4463 || ! h
->def_regular
))
4465 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4466 outrel
.r_addend
= rel
->r_addend
;
4470 /* This symbol is local, or marked to become local. */
4471 if (r_type
== htab
->pointer_r_type
)
4474 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4475 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4477 else if (r_type
== R_X86_64_64
4478 && !ABI_64_P (output_bfd
))
4481 outrel
.r_info
= htab
->r_info (0,
4482 R_X86_64_RELATIVE64
);
4483 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4484 /* Check addend overflow. */
4485 if ((outrel
.r_addend
& 0x80000000)
4486 != (rel
->r_addend
& 0x80000000))
4489 int addend
= rel
->r_addend
;
4490 if (h
&& h
->root
.root
.string
)
4491 name
= h
->root
.root
.string
;
4493 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4496 (*_bfd_error_handler
)
4497 (_("%B: addend -0x%x in relocation %s against "
4498 "symbol `%s' at 0x%lx in section `%A' is "
4500 input_bfd
, input_section
, addend
,
4501 x86_64_elf_howto_table
[r_type
].name
,
4502 name
, (unsigned long) rel
->r_offset
);
4504 (*_bfd_error_handler
)
4505 (_("%B: addend 0x%x in relocation %s against "
4506 "symbol `%s' at 0x%lx in section `%A' is "
4508 input_bfd
, input_section
, addend
,
4509 x86_64_elf_howto_table
[r_type
].name
,
4510 name
, (unsigned long) rel
->r_offset
);
4511 bfd_set_error (bfd_error_bad_value
);
4519 if (bfd_is_abs_section (sec
))
4521 else if (sec
== NULL
|| sec
->owner
== NULL
)
4523 bfd_set_error (bfd_error_bad_value
);
4530 /* We are turning this relocation into one
4531 against a section symbol. It would be
4532 proper to subtract the symbol's value,
4533 osec->vma, from the emitted reloc addend,
4534 but ld.so expects buggy relocs. */
4535 osec
= sec
->output_section
;
4536 sindx
= elf_section_data (osec
)->dynindx
;
4539 asection
*oi
= htab
->elf
.text_index_section
;
4540 sindx
= elf_section_data (oi
)->dynindx
;
4542 BFD_ASSERT (sindx
!= 0);
4545 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4546 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4550 sreloc
= elf_section_data (input_section
)->sreloc
;
4552 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4554 r
= bfd_reloc_notsupported
;
4555 goto check_relocation_error
;
4558 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4560 /* If this reloc is against an external symbol, we do
4561 not want to fiddle with the addend. Otherwise, we
4562 need to include the symbol value so that it becomes
4563 an addend for the dynamic reloc. */
4570 case R_X86_64_TLSGD
:
4571 case R_X86_64_GOTPC32_TLSDESC
:
4572 case R_X86_64_TLSDESC_CALL
:
4573 case R_X86_64_GOTTPOFF
:
4574 tls_type
= GOT_UNKNOWN
;
4575 if (h
== NULL
&& local_got_offsets
)
4576 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4578 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4580 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4581 input_section
, contents
,
4582 symtab_hdr
, sym_hashes
,
4583 &r_type
, tls_type
, rel
,
4584 relend
, h
, r_symndx
))
4587 if (r_type
== R_X86_64_TPOFF32
)
4589 bfd_vma roff
= rel
->r_offset
;
4591 BFD_ASSERT (! unresolved_reloc
);
4593 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4595 /* GD->LE transition. For 64bit, change
4596 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4597 .word 0x6666; rex64; call __tls_get_addr
4600 leaq foo@tpoff(%rax), %rax
4602 leaq foo@tlsgd(%rip), %rdi
4603 .word 0x6666; rex64; call __tls_get_addr
4606 leaq foo@tpoff(%rax), %rax
4607 For largepic, change:
4608 leaq foo@tlsgd(%rip), %rdi
4609 movabsq $__tls_get_addr@pltoff, %rax
4614 leaq foo@tpoff(%rax), %rax
4615 nopw 0x0(%rax,%rax,1) */
4617 if (ABI_64_P (output_bfd
)
4618 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4620 memcpy (contents
+ roff
- 3,
4621 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4622 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4625 else if (ABI_64_P (output_bfd
))
4626 memcpy (contents
+ roff
- 4,
4627 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4630 memcpy (contents
+ roff
- 3,
4631 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4633 bfd_put_32 (output_bfd
,
4634 elf_x86_64_tpoff (info
, relocation
),
4635 contents
+ roff
+ 8 + largepic
);
4636 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4640 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4642 /* GDesc -> LE transition.
4643 It's originally something like:
4644 leaq x@tlsdesc(%rip), %rax
4647 movl $x@tpoff, %rax. */
4649 unsigned int val
, type
;
4651 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4652 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4653 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4654 contents
+ roff
- 3);
4655 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4656 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4657 contents
+ roff
- 1);
4658 bfd_put_32 (output_bfd
,
4659 elf_x86_64_tpoff (info
, relocation
),
4663 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4665 /* GDesc -> LE transition.
4670 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4671 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4674 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4676 /* IE->LE transition:
4677 For 64bit, originally it can be one of:
4678 movq foo@gottpoff(%rip), %reg
4679 addq foo@gottpoff(%rip), %reg
4682 leaq foo(%reg), %reg
4684 For 32bit, originally it can be one of:
4685 movq foo@gottpoff(%rip), %reg
4686 addl foo@gottpoff(%rip), %reg
4689 leal foo(%reg), %reg
4692 unsigned int val
, type
, reg
;
4695 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4698 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4699 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4705 bfd_put_8 (output_bfd
, 0x49,
4706 contents
+ roff
- 3);
4707 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4708 bfd_put_8 (output_bfd
, 0x41,
4709 contents
+ roff
- 3);
4710 bfd_put_8 (output_bfd
, 0xc7,
4711 contents
+ roff
- 2);
4712 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4713 contents
+ roff
- 1);
4717 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4720 bfd_put_8 (output_bfd
, 0x49,
4721 contents
+ roff
- 3);
4722 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4723 bfd_put_8 (output_bfd
, 0x41,
4724 contents
+ roff
- 3);
4725 bfd_put_8 (output_bfd
, 0x81,
4726 contents
+ roff
- 2);
4727 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4728 contents
+ roff
- 1);
4732 /* addq/addl -> leaq/leal */
4734 bfd_put_8 (output_bfd
, 0x4d,
4735 contents
+ roff
- 3);
4736 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4737 bfd_put_8 (output_bfd
, 0x45,
4738 contents
+ roff
- 3);
4739 bfd_put_8 (output_bfd
, 0x8d,
4740 contents
+ roff
- 2);
4741 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4742 contents
+ roff
- 1);
4744 bfd_put_32 (output_bfd
,
4745 elf_x86_64_tpoff (info
, relocation
),
4753 if (htab
->elf
.sgot
== NULL
)
4758 off
= h
->got
.offset
;
4759 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4763 if (local_got_offsets
== NULL
)
4766 off
= local_got_offsets
[r_symndx
];
4767 offplt
= local_tlsdesc_gotents
[r_symndx
];
4774 Elf_Internal_Rela outrel
;
4778 if (htab
->elf
.srelgot
== NULL
)
4781 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4783 if (GOT_TLS_GDESC_P (tls_type
))
4785 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4786 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4787 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4788 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4789 + htab
->elf
.sgotplt
->output_offset
4791 + htab
->sgotplt_jump_table_size
);
4792 sreloc
= htab
->elf
.srelplt
;
4794 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4796 outrel
.r_addend
= 0;
4797 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4800 sreloc
= htab
->elf
.srelgot
;
4802 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4803 + htab
->elf
.sgot
->output_offset
+ off
);
4805 if (GOT_TLS_GD_P (tls_type
))
4806 dr_type
= R_X86_64_DTPMOD64
;
4807 else if (GOT_TLS_GDESC_P (tls_type
))
4810 dr_type
= R_X86_64_TPOFF64
;
4812 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4813 outrel
.r_addend
= 0;
4814 if ((dr_type
== R_X86_64_TPOFF64
4815 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4816 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4817 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4819 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4821 if (GOT_TLS_GD_P (tls_type
))
4825 BFD_ASSERT (! unresolved_reloc
);
4826 bfd_put_64 (output_bfd
,
4827 relocation
- elf_x86_64_dtpoff_base (info
),
4828 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4832 bfd_put_64 (output_bfd
, 0,
4833 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4834 outrel
.r_info
= htab
->r_info (indx
,
4836 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4837 elf_append_rela (output_bfd
, sreloc
,
4846 local_got_offsets
[r_symndx
] |= 1;
4849 if (off
>= (bfd_vma
) -2
4850 && ! GOT_TLS_GDESC_P (tls_type
))
4852 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4854 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4855 || r_type
== R_X86_64_TLSDESC_CALL
)
4856 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4857 + htab
->elf
.sgotplt
->output_offset
4858 + offplt
+ htab
->sgotplt_jump_table_size
;
4860 relocation
= htab
->elf
.sgot
->output_section
->vma
4861 + htab
->elf
.sgot
->output_offset
+ off
;
4862 unresolved_reloc
= FALSE
;
4866 bfd_vma roff
= rel
->r_offset
;
4868 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4870 /* GD->IE transition. For 64bit, change
4871 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4872 .word 0x6666; rex64; call __tls_get_addr@plt
4875 addq foo@gottpoff(%rip), %rax
4877 leaq foo@tlsgd(%rip), %rdi
4878 .word 0x6666; rex64; call __tls_get_addr@plt
4881 addq foo@gottpoff(%rip), %rax
4882 For largepic, change:
4883 leaq foo@tlsgd(%rip), %rdi
4884 movabsq $__tls_get_addr@pltoff, %rax
4889 addq foo@gottpoff(%rax), %rax
4890 nopw 0x0(%rax,%rax,1) */
4892 if (ABI_64_P (output_bfd
)
4893 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4895 memcpy (contents
+ roff
- 3,
4896 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4897 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4900 else if (ABI_64_P (output_bfd
))
4901 memcpy (contents
+ roff
- 4,
4902 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4905 memcpy (contents
+ roff
- 3,
4906 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4909 relocation
= (htab
->elf
.sgot
->output_section
->vma
4910 + htab
->elf
.sgot
->output_offset
+ off
4913 - input_section
->output_section
->vma
4914 - input_section
->output_offset
4916 bfd_put_32 (output_bfd
, relocation
,
4917 contents
+ roff
+ 8 + largepic
);
4918 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4922 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4924 /* GDesc -> IE transition.
4925 It's originally something like:
4926 leaq x@tlsdesc(%rip), %rax
4929 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4931 /* Now modify the instruction as appropriate. To
4932 turn a leaq into a movq in the form we use it, it
4933 suffices to change the second byte from 0x8d to
4935 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4937 bfd_put_32 (output_bfd
,
4938 htab
->elf
.sgot
->output_section
->vma
4939 + htab
->elf
.sgot
->output_offset
+ off
4941 - input_section
->output_section
->vma
4942 - input_section
->output_offset
4947 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4949 /* GDesc -> IE transition.
4956 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4957 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4965 case R_X86_64_TLSLD
:
4966 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4967 input_section
, contents
,
4968 symtab_hdr
, sym_hashes
,
4969 &r_type
, GOT_UNKNOWN
,
4970 rel
, relend
, h
, r_symndx
))
4973 if (r_type
!= R_X86_64_TLSLD
)
4975 /* LD->LE transition:
4976 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4977 For 64bit, we change it into:
4978 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4979 For 32bit, we change it into:
4980 nopl 0x0(%rax); movl %fs:0, %eax.
4981 For largepic, change:
4982 leaq foo@tlsgd(%rip), %rdi
4983 movabsq $__tls_get_addr@pltoff, %rax
4987 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4990 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
4991 if (ABI_64_P (output_bfd
)
4992 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
4993 memcpy (contents
+ rel
->r_offset
- 3,
4994 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4995 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4996 else if (ABI_64_P (output_bfd
))
4997 memcpy (contents
+ rel
->r_offset
- 3,
4998 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5000 memcpy (contents
+ rel
->r_offset
- 3,
5001 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5002 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5007 if (htab
->elf
.sgot
== NULL
)
5010 off
= htab
->tls_ld_got
.offset
;
5015 Elf_Internal_Rela outrel
;
5017 if (htab
->elf
.srelgot
== NULL
)
5020 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5021 + htab
->elf
.sgot
->output_offset
+ off
);
5023 bfd_put_64 (output_bfd
, 0,
5024 htab
->elf
.sgot
->contents
+ off
);
5025 bfd_put_64 (output_bfd
, 0,
5026 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5027 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5028 outrel
.r_addend
= 0;
5029 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5031 htab
->tls_ld_got
.offset
|= 1;
5033 relocation
= htab
->elf
.sgot
->output_section
->vma
5034 + htab
->elf
.sgot
->output_offset
+ off
;
5035 unresolved_reloc
= FALSE
;
5038 case R_X86_64_DTPOFF32
:
5039 if (!bfd_link_executable (info
)
5040 || (input_section
->flags
& SEC_CODE
) == 0)
5041 relocation
-= elf_x86_64_dtpoff_base (info
);
5043 relocation
= elf_x86_64_tpoff (info
, relocation
);
5046 case R_X86_64_TPOFF32
:
5047 case R_X86_64_TPOFF64
:
5048 BFD_ASSERT (bfd_link_executable (info
));
5049 relocation
= elf_x86_64_tpoff (info
, relocation
);
5052 case R_X86_64_DTPOFF64
:
5053 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5054 relocation
-= elf_x86_64_dtpoff_base (info
);
5061 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5062 because such sections are not SEC_ALLOC and thus ld.so will
5063 not process them. */
5064 if (unresolved_reloc
5065 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5067 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5068 rel
->r_offset
) != (bfd_vma
) -1)
5070 (*_bfd_error_handler
)
5071 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5074 (long) rel
->r_offset
,
5076 h
->root
.root
.string
);
5081 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5082 contents
, rel
->r_offset
,
5083 relocation
, rel
->r_addend
);
5085 check_relocation_error
:
5086 if (r
!= bfd_reloc_ok
)
5091 name
= h
->root
.root
.string
;
5094 name
= bfd_elf_string_from_elf_section (input_bfd
,
5095 symtab_hdr
->sh_link
,
5100 name
= bfd_section_name (input_bfd
, sec
);
5103 if (r
== bfd_reloc_overflow
)
5105 if (! ((*info
->callbacks
->reloc_overflow
)
5106 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5107 (bfd_vma
) 0, input_bfd
, input_section
,
5113 (*_bfd_error_handler
)
5114 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5115 input_bfd
, input_section
,
5116 (long) rel
->r_offset
, name
, (int) r
);
5125 /* Finish up dynamic symbol handling. We set the contents of various
5126 dynamic sections here. */
5129 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5130 struct bfd_link_info
*info
,
5131 struct elf_link_hash_entry
*h
,
5132 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5134 struct elf_x86_64_link_hash_table
*htab
;
5135 const struct elf_x86_64_backend_data
*abed
;
5136 bfd_boolean use_plt_bnd
;
5137 struct elf_x86_64_link_hash_entry
*eh
;
5139 htab
= elf_x86_64_hash_table (info
);
5143 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5144 section only if there is .plt section. */
5145 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5147 ? &elf_x86_64_bnd_arch_bed
5148 : get_elf_x86_64_backend_data (output_bfd
));
5150 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5152 if (h
->plt
.offset
!= (bfd_vma
) -1)
5155 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5156 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5157 Elf_Internal_Rela rela
;
5159 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5160 const struct elf_backend_data
*bed
;
5161 bfd_vma plt_got_pcrel_offset
;
5163 /* When building a static executable, use .iplt, .igot.plt and
5164 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5165 if (htab
->elf
.splt
!= NULL
)
5167 plt
= htab
->elf
.splt
;
5168 gotplt
= htab
->elf
.sgotplt
;
5169 relplt
= htab
->elf
.srelplt
;
5173 plt
= htab
->elf
.iplt
;
5174 gotplt
= htab
->elf
.igotplt
;
5175 relplt
= htab
->elf
.irelplt
;
5178 /* This symbol has an entry in the procedure linkage table. Set
5180 if ((h
->dynindx
== -1
5181 && !((h
->forced_local
|| bfd_link_executable (info
))
5183 && h
->type
== STT_GNU_IFUNC
))
5189 /* Get the index in the procedure linkage table which
5190 corresponds to this symbol. This is the index of this symbol
5191 in all the symbols for which we are making plt entries. The
5192 first entry in the procedure linkage table is reserved.
5194 Get the offset into the .got table of the entry that
5195 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5196 bytes. The first three are reserved for the dynamic linker.
5198 For static executables, we don't reserve anything. */
5200 if (plt
== htab
->elf
.splt
)
5202 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5203 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5207 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5208 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5211 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5212 plt_plt_offset
= abed
->plt_plt_offset
;
5213 plt_got_insn_size
= abed
->plt_got_insn_size
;
5214 plt_got_offset
= abed
->plt_got_offset
;
5217 /* Use the second PLT with BND relocations. */
5218 const bfd_byte
*plt_entry
, *plt2_entry
;
5220 if (eh
->has_bnd_reloc
)
5222 plt_entry
= elf_x86_64_bnd_plt_entry
;
5223 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5227 plt_entry
= elf_x86_64_legacy_plt_entry
;
5228 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5230 /* Subtract 1 since there is no BND prefix. */
5231 plt_plt_insn_end
-= 1;
5232 plt_plt_offset
-= 1;
5233 plt_got_insn_size
-= 1;
5234 plt_got_offset
-= 1;
5237 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5238 == sizeof (elf_x86_64_legacy_plt_entry
));
5240 /* Fill in the entry in the procedure linkage table. */
5241 memcpy (plt
->contents
+ h
->plt
.offset
,
5242 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5243 /* Fill in the entry in the second PLT. */
5244 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5245 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5247 resolved_plt
= htab
->plt_bnd
;
5248 plt_offset
= eh
->plt_bnd
.offset
;
5252 /* Fill in the entry in the procedure linkage table. */
5253 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5254 abed
->plt_entry_size
);
5257 plt_offset
= h
->plt
.offset
;
5260 /* Insert the relocation positions of the plt section. */
5262 /* Put offset the PC-relative instruction referring to the GOT entry,
5263 subtracting the size of that instruction. */
5264 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5265 + gotplt
->output_offset
5267 - resolved_plt
->output_section
->vma
5268 - resolved_plt
->output_offset
5270 - plt_got_insn_size
);
5272 /* Check PC-relative offset overflow in PLT entry. */
5273 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5274 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5275 output_bfd
, h
->root
.root
.string
);
5277 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5278 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5280 /* Fill in the entry in the global offset table, initially this
5281 points to the second part of the PLT entry. */
5282 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5283 + plt
->output_offset
5284 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5285 gotplt
->contents
+ got_offset
);
5287 /* Fill in the entry in the .rela.plt section. */
5288 rela
.r_offset
= (gotplt
->output_section
->vma
5289 + gotplt
->output_offset
5291 if (h
->dynindx
== -1
5292 || ((bfd_link_executable (info
)
5293 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5295 && h
->type
== STT_GNU_IFUNC
))
5297 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5298 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5299 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5300 rela
.r_addend
= (h
->root
.u
.def
.value
5301 + h
->root
.u
.def
.section
->output_section
->vma
5302 + h
->root
.u
.def
.section
->output_offset
);
5303 /* R_X86_64_IRELATIVE comes last. */
5304 plt_index
= htab
->next_irelative_index
--;
5308 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5310 plt_index
= htab
->next_jump_slot_index
++;
5313 /* Don't fill PLT entry for static executables. */
5314 if (plt
== htab
->elf
.splt
)
5316 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5318 /* Put relocation index. */
5319 bfd_put_32 (output_bfd
, plt_index
,
5320 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5322 /* Put offset for jmp .PLT0 and check for overflow. We don't
5323 check relocation index for overflow since branch displacement
5324 will overflow first. */
5325 if (plt0_offset
> 0x80000000)
5326 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5327 output_bfd
, h
->root
.root
.string
);
5328 bfd_put_32 (output_bfd
, - plt0_offset
,
5329 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5332 bed
= get_elf_backend_data (output_bfd
);
5333 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5334 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5336 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5338 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5339 asection
*plt
, *got
;
5340 bfd_boolean got_after_plt
;
5341 int32_t got_pcrel_offset
;
5342 const bfd_byte
*got_plt_entry
;
5344 /* Set the entry in the GOT procedure linkage table. */
5345 plt
= htab
->plt_got
;
5346 got
= htab
->elf
.sgot
;
5347 got_offset
= h
->got
.offset
;
5349 if (got_offset
== (bfd_vma
) -1
5350 || h
->type
== STT_GNU_IFUNC
5355 /* Use the second PLT entry template for the GOT PLT since they
5356 are the identical. */
5357 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5358 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5359 if (eh
->has_bnd_reloc
)
5360 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5363 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5365 /* Subtract 1 since there is no BND prefix. */
5366 plt_got_insn_size
-= 1;
5367 plt_got_offset
-= 1;
5370 /* Fill in the entry in the GOT procedure linkage table. */
5371 plt_offset
= eh
->plt_got
.offset
;
5372 memcpy (plt
->contents
+ plt_offset
,
5373 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5375 /* Put offset the PC-relative instruction referring to the GOT
5376 entry, subtracting the size of that instruction. */
5377 got_pcrel_offset
= (got
->output_section
->vma
5378 + got
->output_offset
5380 - plt
->output_section
->vma
5381 - plt
->output_offset
5383 - plt_got_insn_size
);
5385 /* Check PC-relative offset overflow in GOT PLT entry. */
5386 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5387 if ((got_after_plt
&& got_pcrel_offset
< 0)
5388 || (!got_after_plt
&& got_pcrel_offset
> 0))
5389 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5390 output_bfd
, h
->root
.root
.string
);
5392 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5393 plt
->contents
+ plt_offset
+ plt_got_offset
);
5397 && (h
->plt
.offset
!= (bfd_vma
) -1
5398 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5400 /* Mark the symbol as undefined, rather than as defined in
5401 the .plt section. Leave the value if there were any
5402 relocations where pointer equality matters (this is a clue
5403 for the dynamic linker, to make function pointer
5404 comparisons work between an application and shared
5405 library), otherwise set it to zero. If a function is only
5406 called from a binary, there is no need to slow down
5407 shared libraries because of that. */
5408 sym
->st_shndx
= SHN_UNDEF
;
5409 if (!h
->pointer_equality_needed
)
5413 if (h
->got
.offset
!= (bfd_vma
) -1
5414 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5415 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5417 Elf_Internal_Rela rela
;
5419 /* This symbol has an entry in the global offset table. Set it
5421 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5424 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5425 + htab
->elf
.sgot
->output_offset
5426 + (h
->got
.offset
&~ (bfd_vma
) 1));
5428 /* If this is a static link, or it is a -Bsymbolic link and the
5429 symbol is defined locally or was forced to be local because
5430 of a version file, we just want to emit a RELATIVE reloc.
5431 The entry in the global offset table will already have been
5432 initialized in the relocate_section function. */
5434 && h
->type
== STT_GNU_IFUNC
)
5436 if (bfd_link_pic (info
))
5438 /* Generate R_X86_64_GLOB_DAT. */
5445 if (!h
->pointer_equality_needed
)
5448 /* For non-shared object, we can't use .got.plt, which
5449 contains the real function addres if we need pointer
5450 equality. We load the GOT entry with the PLT entry. */
5451 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5452 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5453 + plt
->output_offset
5455 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5459 else if (bfd_link_pic (info
)
5460 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5462 if (!h
->def_regular
)
5464 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5465 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5466 rela
.r_addend
= (h
->root
.u
.def
.value
5467 + h
->root
.u
.def
.section
->output_section
->vma
5468 + h
->root
.u
.def
.section
->output_offset
);
5472 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5474 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5475 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5476 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5480 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5485 Elf_Internal_Rela rela
;
5487 /* This symbol needs a copy reloc. Set it up. */
5489 if (h
->dynindx
== -1
5490 || (h
->root
.type
!= bfd_link_hash_defined
5491 && h
->root
.type
!= bfd_link_hash_defweak
)
5492 || htab
->srelbss
== NULL
)
5495 rela
.r_offset
= (h
->root
.u
.def
.value
5496 + h
->root
.u
.def
.section
->output_section
->vma
5497 + h
->root
.u
.def
.section
->output_offset
);
5498 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5500 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5506 /* Finish up local dynamic symbol handling. We set the contents of
5507 various dynamic sections here. */
5510 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5512 struct elf_link_hash_entry
*h
5513 = (struct elf_link_hash_entry
*) *slot
;
5514 struct bfd_link_info
*info
5515 = (struct bfd_link_info
*) inf
;
5517 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5521 /* Used to decide how to sort relocs in an optimal manner for the
5522 dynamic linker, before writing them out. */
5524 static enum elf_reloc_type_class
5525 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
5526 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5527 const Elf_Internal_Rela
*rela
)
5529 bfd
*abfd
= info
->output_bfd
;
5530 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5531 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
5532 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
5533 Elf_Internal_Sym sym
;
5535 if (htab
->elf
.dynsym
== NULL
5536 || !bed
->s
->swap_symbol_in (abfd
,
5537 (htab
->elf
.dynsym
->contents
5538 + r_symndx
* bed
->s
->sizeof_sym
),
5542 /* Check relocation against STT_GNU_IFUNC symbol. */
5543 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5544 return reloc_class_ifunc
;
5546 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5548 case R_X86_64_RELATIVE
:
5549 case R_X86_64_RELATIVE64
:
5550 return reloc_class_relative
;
5551 case R_X86_64_JUMP_SLOT
:
5552 return reloc_class_plt
;
5554 return reloc_class_copy
;
5556 return reloc_class_normal
;
5560 /* Finish up the dynamic sections. */
5563 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5564 struct bfd_link_info
*info
)
5566 struct elf_x86_64_link_hash_table
*htab
;
5569 const struct elf_x86_64_backend_data
*abed
;
5571 htab
= elf_x86_64_hash_table (info
);
5575 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5576 section only if there is .plt section. */
5577 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5578 ? &elf_x86_64_bnd_arch_bed
5579 : get_elf_x86_64_backend_data (output_bfd
));
5581 dynobj
= htab
->elf
.dynobj
;
5582 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5584 if (htab
->elf
.dynamic_sections_created
)
5586 bfd_byte
*dyncon
, *dynconend
;
5587 const struct elf_backend_data
*bed
;
5588 bfd_size_type sizeof_dyn
;
5590 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5593 bed
= get_elf_backend_data (dynobj
);
5594 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5595 dyncon
= sdyn
->contents
;
5596 dynconend
= sdyn
->contents
+ sdyn
->size
;
5597 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5599 Elf_Internal_Dyn dyn
;
5602 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5610 s
= htab
->elf
.sgotplt
;
5611 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5615 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5619 s
= htab
->elf
.srelplt
->output_section
;
5620 dyn
.d_un
.d_val
= s
->size
;
5624 /* The procedure linkage table relocs (DT_JMPREL) should
5625 not be included in the overall relocs (DT_RELA).
5626 Therefore, we override the DT_RELASZ entry here to
5627 make it not include the JMPREL relocs. Since the
5628 linker script arranges for .rela.plt to follow all
5629 other relocation sections, we don't have to worry
5630 about changing the DT_RELA entry. */
5631 if (htab
->elf
.srelplt
!= NULL
)
5633 s
= htab
->elf
.srelplt
->output_section
;
5634 dyn
.d_un
.d_val
-= s
->size
;
5638 case DT_TLSDESC_PLT
:
5640 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5641 + htab
->tlsdesc_plt
;
5644 case DT_TLSDESC_GOT
:
5646 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5647 + htab
->tlsdesc_got
;
5651 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5654 /* Fill in the special first entry in the procedure linkage table. */
5655 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5657 /* Fill in the first entry in the procedure linkage table. */
5658 memcpy (htab
->elf
.splt
->contents
,
5659 abed
->plt0_entry
, abed
->plt_entry_size
);
5660 /* Add offset for pushq GOT+8(%rip), since the instruction
5661 uses 6 bytes subtract this value. */
5662 bfd_put_32 (output_bfd
,
5663 (htab
->elf
.sgotplt
->output_section
->vma
5664 + htab
->elf
.sgotplt
->output_offset
5666 - htab
->elf
.splt
->output_section
->vma
5667 - htab
->elf
.splt
->output_offset
5669 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5670 /* Add offset for the PC-relative instruction accessing GOT+16,
5671 subtracting the offset to the end of that instruction. */
5672 bfd_put_32 (output_bfd
,
5673 (htab
->elf
.sgotplt
->output_section
->vma
5674 + htab
->elf
.sgotplt
->output_offset
5676 - htab
->elf
.splt
->output_section
->vma
5677 - htab
->elf
.splt
->output_offset
5678 - abed
->plt0_got2_insn_end
),
5679 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5681 elf_section_data (htab
->elf
.splt
->output_section
)
5682 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5684 if (htab
->tlsdesc_plt
)
5686 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5687 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5689 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5690 abed
->plt0_entry
, abed
->plt_entry_size
);
5692 /* Add offset for pushq GOT+8(%rip), since the
5693 instruction uses 6 bytes subtract this value. */
5694 bfd_put_32 (output_bfd
,
5695 (htab
->elf
.sgotplt
->output_section
->vma
5696 + htab
->elf
.sgotplt
->output_offset
5698 - htab
->elf
.splt
->output_section
->vma
5699 - htab
->elf
.splt
->output_offset
5702 htab
->elf
.splt
->contents
5703 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5704 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5705 where TGD stands for htab->tlsdesc_got, subtracting the offset
5706 to the end of that instruction. */
5707 bfd_put_32 (output_bfd
,
5708 (htab
->elf
.sgot
->output_section
->vma
5709 + htab
->elf
.sgot
->output_offset
5711 - htab
->elf
.splt
->output_section
->vma
5712 - htab
->elf
.splt
->output_offset
5714 - abed
->plt0_got2_insn_end
),
5715 htab
->elf
.splt
->contents
5716 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5721 if (htab
->plt_bnd
!= NULL
)
5722 elf_section_data (htab
->plt_bnd
->output_section
)
5723 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5725 if (htab
->elf
.sgotplt
)
5727 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5729 (*_bfd_error_handler
)
5730 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5734 /* Fill in the first three entries in the global offset table. */
5735 if (htab
->elf
.sgotplt
->size
> 0)
5737 /* Set the first entry in the global offset table to the address of
5738 the dynamic section. */
5740 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5742 bfd_put_64 (output_bfd
,
5743 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5744 htab
->elf
.sgotplt
->contents
);
5745 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5746 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5747 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5750 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5754 /* Adjust .eh_frame for .plt section. */
5755 if (htab
->plt_eh_frame
!= NULL
5756 && htab
->plt_eh_frame
->contents
!= NULL
)
5758 if (htab
->elf
.splt
!= NULL
5759 && htab
->elf
.splt
->size
!= 0
5760 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5761 && htab
->elf
.splt
->output_section
!= NULL
5762 && htab
->plt_eh_frame
->output_section
!= NULL
)
5764 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5765 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5766 + htab
->plt_eh_frame
->output_offset
5767 + PLT_FDE_START_OFFSET
;
5768 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5769 htab
->plt_eh_frame
->contents
5770 + PLT_FDE_START_OFFSET
);
5772 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5774 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5776 htab
->plt_eh_frame
->contents
))
5781 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5782 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5785 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5786 htab_traverse (htab
->loc_hash_table
,
5787 elf_x86_64_finish_local_dynamic_symbol
,
5793 /* Return an array of PLT entry symbol values. */
5796 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
5799 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5802 bfd_vma
*plt_sym_val
;
5804 bfd_byte
*plt_contents
;
5805 const struct elf_x86_64_backend_data
*bed
;
5806 Elf_Internal_Shdr
*hdr
;
5809 /* Get the .plt section contents. PLT passed down may point to the
5810 .plt.bnd section. Make sure that PLT always points to the .plt
5812 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5817 plt
= bfd_get_section_by_name (abfd
, ".plt");
5820 bed
= &elf_x86_64_bnd_arch_bed
;
5823 bed
= get_elf_x86_64_backend_data (abfd
);
5825 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
5826 if (plt_contents
== NULL
)
5828 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5829 plt_contents
, 0, plt
->size
))
5832 free (plt_contents
);
5836 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
5837 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
5840 hdr
= &elf_section_data (relplt
)->this_hdr
;
5841 count
= relplt
->size
/ hdr
->sh_entsize
;
5843 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
5844 if (plt_sym_val
== NULL
)
5847 for (i
= 0; i
< count
; i
++)
5848 plt_sym_val
[i
] = -1;
5850 plt_offset
= bed
->plt_entry_size
;
5851 p
= relplt
->relocation
;
5852 for (i
= 0; i
< count
; i
++, p
++)
5856 /* Skip unknown relocation. */
5857 if (p
->howto
== NULL
)
5860 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
5861 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
5864 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
5865 + bed
->plt_reloc_offset
));
5866 if (reloc_index
>= count
)
5870 /* This is the index in .plt section. */
5871 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
5872 /* Store VMA + the offset in .plt.bnd section. */
5873 plt_sym_val
[reloc_index
] =
5875 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
5878 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
5879 plt_offset
+= bed
->plt_entry_size
;
5881 /* PR binutils/18437: Skip extra relocations in the .rela.plt
5883 if (plt_offset
>= plt
->size
)
5887 free (plt_contents
);
5892 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5896 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
5903 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5904 as PLT if it exists. */
5905 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5907 plt
= bfd_get_section_by_name (abfd
, ".plt");
5908 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
5909 dynsymcount
, dynsyms
, ret
,
5911 elf_x86_64_get_plt_sym_val
);
5914 /* Handle an x86-64 specific section when reading an object file. This
5915 is called when elfcode.h finds a section with an unknown type. */
5918 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
5919 const char *name
, int shindex
)
5921 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
5924 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
5930 /* Hook called by the linker routine which adds symbols from an object
5931 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5935 elf_x86_64_add_symbol_hook (bfd
*abfd
,
5936 struct bfd_link_info
*info
,
5937 Elf_Internal_Sym
*sym
,
5938 const char **namep ATTRIBUTE_UNUSED
,
5939 flagword
*flagsp ATTRIBUTE_UNUSED
,
5945 switch (sym
->st_shndx
)
5947 case SHN_X86_64_LCOMMON
:
5948 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
5951 lcomm
= bfd_make_section_with_flags (abfd
,
5955 | SEC_LINKER_CREATED
));
5958 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
5961 *valp
= sym
->st_size
;
5965 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
5966 && (abfd
->flags
& DYNAMIC
) == 0
5967 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
5968 elf_tdata (info
->output_bfd
)->has_gnu_symbols
5969 |= elf_gnu_symbol_unique
;
5975 /* Given a BFD section, try to locate the corresponding ELF section
5979 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
5980 asection
*sec
, int *index_return
)
5982 if (sec
== &_bfd_elf_large_com_section
)
5984 *index_return
= SHN_X86_64_LCOMMON
;
5990 /* Process a symbol. */
5993 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
5996 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
5998 switch (elfsym
->internal_elf_sym
.st_shndx
)
6000 case SHN_X86_64_LCOMMON
:
6001 asym
->section
= &_bfd_elf_large_com_section
;
6002 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
6003 /* Common symbol doesn't set BSF_GLOBAL. */
6004 asym
->flags
&= ~BSF_GLOBAL
;
6010 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6012 return (sym
->st_shndx
== SHN_COMMON
6013 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6017 elf_x86_64_common_section_index (asection
*sec
)
6019 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6022 return SHN_X86_64_LCOMMON
;
6026 elf_x86_64_common_section (asection
*sec
)
6028 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6029 return bfd_com_section_ptr
;
6031 return &_bfd_elf_large_com_section
;
6035 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6036 const Elf_Internal_Sym
*sym
,
6041 const asection
*oldsec
)
6043 /* A normal common symbol and a large common symbol result in a
6044 normal common symbol. We turn the large common symbol into a
6047 && h
->root
.type
== bfd_link_hash_common
6049 && bfd_is_com_section (*psec
)
6052 if (sym
->st_shndx
== SHN_COMMON
6053 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6055 h
->root
.u
.c
.p
->section
6056 = bfd_make_section_old_way (oldbfd
, "COMMON");
6057 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6059 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6060 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6061 *psec
= bfd_com_section_ptr
;
6068 elf_x86_64_additional_program_headers (bfd
*abfd
,
6069 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6074 /* Check to see if we need a large readonly segment. */
6075 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6076 if (s
&& (s
->flags
& SEC_LOAD
))
6079 /* Check to see if we need a large data segment. Since .lbss sections
6080 is placed right after the .bss section, there should be no need for
6081 a large data segment just because of .lbss. */
6082 s
= bfd_get_section_by_name (abfd
, ".ldata");
6083 if (s
&& (s
->flags
& SEC_LOAD
))
6089 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6092 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6094 if (h
->plt
.offset
!= (bfd_vma
) -1
6096 && !h
->pointer_equality_needed
)
6099 return _bfd_elf_hash_symbol (h
);
6102 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6105 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6106 const bfd_target
*output
)
6108 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6109 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6110 && _bfd_elf_relocs_compatible (input
, output
));
6113 static const struct bfd_elf_special_section
6114 elf_x86_64_special_sections
[]=
6116 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6117 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6118 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6119 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6120 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6121 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6122 { NULL
, 0, 0, 0, 0 }
6125 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6126 #define TARGET_LITTLE_NAME "elf64-x86-64"
6127 #define ELF_ARCH bfd_arch_i386
6128 #define ELF_TARGET_ID X86_64_ELF_DATA
6129 #define ELF_MACHINE_CODE EM_X86_64
6130 #define ELF_MAXPAGESIZE 0x200000
6131 #define ELF_MINPAGESIZE 0x1000
6132 #define ELF_COMMONPAGESIZE 0x1000
6134 #define elf_backend_can_gc_sections 1
6135 #define elf_backend_can_refcount 1
6136 #define elf_backend_want_got_plt 1
6137 #define elf_backend_plt_readonly 1
6138 #define elf_backend_want_plt_sym 0
6139 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6140 #define elf_backend_rela_normal 1
6141 #define elf_backend_plt_alignment 4
6142 #define elf_backend_extern_protected_data 1
6144 #define elf_info_to_howto elf_x86_64_info_to_howto
6146 #define bfd_elf64_bfd_link_hash_table_create \
6147 elf_x86_64_link_hash_table_create
6148 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6149 #define bfd_elf64_bfd_reloc_name_lookup \
6150 elf_x86_64_reloc_name_lookup
6152 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6153 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6154 #define elf_backend_check_relocs elf_x86_64_check_relocs
6155 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6156 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6157 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6158 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6159 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6160 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6161 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6162 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6164 #define elf_backend_write_core_note elf_x86_64_write_core_note
6166 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6167 #define elf_backend_relocate_section elf_x86_64_relocate_section
6168 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6169 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6170 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6171 #define elf_backend_object_p elf64_x86_64_elf_object_p
6172 #define bfd_elf64_mkobject elf_x86_64_mkobject
6173 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6175 #define elf_backend_section_from_shdr \
6176 elf_x86_64_section_from_shdr
6178 #define elf_backend_section_from_bfd_section \
6179 elf_x86_64_elf_section_from_bfd_section
6180 #define elf_backend_add_symbol_hook \
6181 elf_x86_64_add_symbol_hook
6182 #define elf_backend_symbol_processing \
6183 elf_x86_64_symbol_processing
6184 #define elf_backend_common_section_index \
6185 elf_x86_64_common_section_index
6186 #define elf_backend_common_section \
6187 elf_x86_64_common_section
6188 #define elf_backend_common_definition \
6189 elf_x86_64_common_definition
6190 #define elf_backend_merge_symbol \
6191 elf_x86_64_merge_symbol
6192 #define elf_backend_special_sections \
6193 elf_x86_64_special_sections
6194 #define elf_backend_additional_program_headers \
6195 elf_x86_64_additional_program_headers
6196 #define elf_backend_hash_symbol \
6197 elf_x86_64_hash_symbol
6199 #include "elf64-target.h"
6201 /* CloudABI support. */
6203 #undef TARGET_LITTLE_SYM
6204 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6205 #undef TARGET_LITTLE_NAME
6206 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6209 #define ELF_OSABI ELFOSABI_CLOUDABI
6212 #define elf64_bed elf64_x86_64_cloudabi_bed
6214 #include "elf64-target.h"
6216 /* FreeBSD support. */
6218 #undef TARGET_LITTLE_SYM
6219 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6220 #undef TARGET_LITTLE_NAME
6221 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6224 #define ELF_OSABI ELFOSABI_FREEBSD
6227 #define elf64_bed elf64_x86_64_fbsd_bed
6229 #include "elf64-target.h"
6231 /* Solaris 2 support. */
6233 #undef TARGET_LITTLE_SYM
6234 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6235 #undef TARGET_LITTLE_NAME
6236 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6238 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6239 objects won't be recognized. */
6243 #define elf64_bed elf64_x86_64_sol2_bed
6245 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6247 #undef elf_backend_static_tls_alignment
6248 #define elf_backend_static_tls_alignment 16
6250 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6252 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6254 #undef elf_backend_want_plt_sym
6255 #define elf_backend_want_plt_sym 1
6257 #include "elf64-target.h"
6259 /* Native Client support. */
6262 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6264 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6265 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6269 #undef TARGET_LITTLE_SYM
6270 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6271 #undef TARGET_LITTLE_NAME
6272 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6274 #define elf64_bed elf64_x86_64_nacl_bed
6276 #undef ELF_MAXPAGESIZE
6277 #undef ELF_MINPAGESIZE
6278 #undef ELF_COMMONPAGESIZE
6279 #define ELF_MAXPAGESIZE 0x10000
6280 #define ELF_MINPAGESIZE 0x10000
6281 #define ELF_COMMONPAGESIZE 0x10000
6283 /* Restore defaults. */
6285 #undef elf_backend_static_tls_alignment
6286 #undef elf_backend_want_plt_sym
6287 #define elf_backend_want_plt_sym 0
6289 /* NaCl uses substantially different PLT entries for the same effects. */
6291 #undef elf_backend_plt_alignment
6292 #define elf_backend_plt_alignment 5
6293 #define NACL_PLT_ENTRY_SIZE 64
6294 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6296 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6298 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6299 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6300 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6301 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6302 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6304 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6305 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6307 /* 32 bytes of nop to pad out to the standard size. */
6308 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6309 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6310 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6311 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6312 0x66, /* excess data32 prefix */
6316 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6318 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6319 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6320 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6321 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6323 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6324 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6325 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6327 /* Lazy GOT entries point here (32-byte aligned). */
6328 0x68, /* pushq immediate */
6329 0, 0, 0, 0, /* replaced with index into relocation table. */
6330 0xe9, /* jmp relative */
6331 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6333 /* 22 bytes of nop to pad out to the standard size. */
6334 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6335 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6336 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6339 /* .eh_frame covering the .plt section. */
6341 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6343 #if (PLT_CIE_LENGTH != 20 \
6344 || PLT_FDE_LENGTH != 36 \
6345 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6346 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6347 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6349 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6350 0, 0, 0, 0, /* CIE ID */
6351 1, /* CIE version */
6352 'z', 'R', 0, /* Augmentation string */
6353 1, /* Code alignment factor */
6354 0x78, /* Data alignment factor */
6355 16, /* Return address column */
6356 1, /* Augmentation size */
6357 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6358 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6359 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6360 DW_CFA_nop
, DW_CFA_nop
,
6362 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6363 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6364 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6365 0, 0, 0, 0, /* .plt size goes here */
6366 0, /* Augmentation size */
6367 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6368 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6369 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6370 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6371 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6372 13, /* Block length */
6373 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6374 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6375 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6376 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6377 DW_CFA_nop
, DW_CFA_nop
6380 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6382 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6383 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6384 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6385 2, /* plt0_got1_offset */
6386 9, /* plt0_got2_offset */
6387 13, /* plt0_got2_insn_end */
6388 3, /* plt_got_offset */
6389 33, /* plt_reloc_offset */
6390 38, /* plt_plt_offset */
6391 7, /* plt_got_insn_size */
6392 42, /* plt_plt_insn_end */
6393 32, /* plt_lazy_offset */
6394 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6395 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6398 #undef elf_backend_arch_data
6399 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6401 #undef elf_backend_object_p
6402 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6403 #undef elf_backend_modify_segment_map
6404 #define elf_backend_modify_segment_map nacl_modify_segment_map
6405 #undef elf_backend_modify_program_headers
6406 #define elf_backend_modify_program_headers nacl_modify_program_headers
6407 #undef elf_backend_final_write_processing
6408 #define elf_backend_final_write_processing nacl_final_write_processing
6410 #include "elf64-target.h"
6412 /* Native Client x32 support. */
6415 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6417 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6418 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6422 #undef TARGET_LITTLE_SYM
6423 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6424 #undef TARGET_LITTLE_NAME
6425 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6427 #define elf32_bed elf32_x86_64_nacl_bed
6429 #define bfd_elf32_bfd_link_hash_table_create \
6430 elf_x86_64_link_hash_table_create
6431 #define bfd_elf32_bfd_reloc_type_lookup \
6432 elf_x86_64_reloc_type_lookup
6433 #define bfd_elf32_bfd_reloc_name_lookup \
6434 elf_x86_64_reloc_name_lookup
6435 #define bfd_elf32_mkobject \
6437 #define bfd_elf32_get_synthetic_symtab \
6438 elf_x86_64_get_synthetic_symtab
6440 #undef elf_backend_object_p
6441 #define elf_backend_object_p \
6442 elf32_x86_64_nacl_elf_object_p
6444 #undef elf_backend_bfd_from_remote_memory
6445 #define elf_backend_bfd_from_remote_memory \
6446 _bfd_elf32_bfd_from_remote_memory
6448 #undef elf_backend_size_info
6449 #define elf_backend_size_info \
6450 _bfd_elf32_size_info
6452 #include "elf32-target.h"
6454 /* Restore defaults. */
6455 #undef elf_backend_object_p
6456 #define elf_backend_object_p elf64_x86_64_elf_object_p
6457 #undef elf_backend_bfd_from_remote_memory
6458 #undef elf_backend_size_info
6459 #undef elf_backend_modify_segment_map
6460 #undef elf_backend_modify_program_headers
6461 #undef elf_backend_final_write_processing
6463 /* Intel L1OM support. */
6466 elf64_l1om_elf_object_p (bfd
*abfd
)
6468 /* Set the right machine number for an L1OM elf64 file. */
6469 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6473 #undef TARGET_LITTLE_SYM
6474 #define TARGET_LITTLE_SYM l1om_elf64_vec
6475 #undef TARGET_LITTLE_NAME
6476 #define TARGET_LITTLE_NAME "elf64-l1om"
6478 #define ELF_ARCH bfd_arch_l1om
6480 #undef ELF_MACHINE_CODE
6481 #define ELF_MACHINE_CODE EM_L1OM
6486 #define elf64_bed elf64_l1om_bed
6488 #undef elf_backend_object_p
6489 #define elf_backend_object_p elf64_l1om_elf_object_p
6491 /* Restore defaults. */
6492 #undef ELF_MAXPAGESIZE
6493 #undef ELF_MINPAGESIZE
6494 #undef ELF_COMMONPAGESIZE
6495 #define ELF_MAXPAGESIZE 0x200000
6496 #define ELF_MINPAGESIZE 0x1000
6497 #define ELF_COMMONPAGESIZE 0x1000
6498 #undef elf_backend_plt_alignment
6499 #define elf_backend_plt_alignment 4
6500 #undef elf_backend_arch_data
6501 #define elf_backend_arch_data &elf_x86_64_arch_bed
6503 #include "elf64-target.h"
6505 /* FreeBSD L1OM support. */
6507 #undef TARGET_LITTLE_SYM
6508 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6509 #undef TARGET_LITTLE_NAME
6510 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6513 #define ELF_OSABI ELFOSABI_FREEBSD
6516 #define elf64_bed elf64_l1om_fbsd_bed
6518 #include "elf64-target.h"
6520 /* Intel K1OM support. */
6523 elf64_k1om_elf_object_p (bfd
*abfd
)
6525 /* Set the right machine number for an K1OM elf64 file. */
6526 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6530 #undef TARGET_LITTLE_SYM
6531 #define TARGET_LITTLE_SYM k1om_elf64_vec
6532 #undef TARGET_LITTLE_NAME
6533 #define TARGET_LITTLE_NAME "elf64-k1om"
6535 #define ELF_ARCH bfd_arch_k1om
6537 #undef ELF_MACHINE_CODE
6538 #define ELF_MACHINE_CODE EM_K1OM
6543 #define elf64_bed elf64_k1om_bed
6545 #undef elf_backend_object_p
6546 #define elf_backend_object_p elf64_k1om_elf_object_p
6548 #undef elf_backend_static_tls_alignment
6550 #undef elf_backend_want_plt_sym
6551 #define elf_backend_want_plt_sym 0
6553 #include "elf64-target.h"
6555 /* FreeBSD K1OM support. */
6557 #undef TARGET_LITTLE_SYM
6558 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6559 #undef TARGET_LITTLE_NAME
6560 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6563 #define ELF_OSABI ELFOSABI_FREEBSD
6566 #define elf64_bed elf64_k1om_fbsd_bed
6568 #include "elf64-target.h"
6570 /* 32bit x86-64 support. */
6572 #undef TARGET_LITTLE_SYM
6573 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6574 #undef TARGET_LITTLE_NAME
6575 #define TARGET_LITTLE_NAME "elf32-x86-64"
6579 #define ELF_ARCH bfd_arch_i386
6581 #undef ELF_MACHINE_CODE
6582 #define ELF_MACHINE_CODE EM_X86_64
6586 #undef elf_backend_object_p
6587 #define elf_backend_object_p \
6588 elf32_x86_64_elf_object_p
6590 #undef elf_backend_bfd_from_remote_memory
6591 #define elf_backend_bfd_from_remote_memory \
6592 _bfd_elf32_bfd_from_remote_memory
6594 #undef elf_backend_size_info
6595 #define elf_backend_size_info \
6596 _bfd_elf32_size_info
6598 #include "elf32-target.h"