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
;
3013 unsigned int opcode
;
3015 if (r_type
!= R_X86_64_GOTPCREL
)
3018 roff
= irel
->r_offset
;
3023 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
3025 /* PR ld/18591: Don't convert R_X86_64_GOTPCREL relocation if it
3026 isn't for mov instruction. */
3030 /* Get the symbol referred to by the reloc. */
3031 if (r_symndx
< symtab_hdr
->sh_info
)
3033 Elf_Internal_Sym
*isym
;
3035 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
3038 symtype
= ELF_ST_TYPE (isym
->st_info
);
3040 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation and
3041 skip relocation against undefined symbols. */
3042 if (symtype
== STT_GNU_IFUNC
|| isym
->st_shndx
== SHN_UNDEF
)
3045 if (isym
->st_shndx
== SHN_ABS
)
3046 tsec
= bfd_abs_section_ptr
;
3047 else if (isym
->st_shndx
== SHN_COMMON
)
3048 tsec
= bfd_com_section_ptr
;
3049 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
3050 tsec
= &_bfd_elf_large_com_section
;
3052 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3055 toff
= isym
->st_value
;
3059 indx
= r_symndx
- symtab_hdr
->sh_info
;
3060 h
= elf_sym_hashes (abfd
)[indx
];
3061 BFD_ASSERT (h
!= NULL
);
3063 while (h
->root
.type
== bfd_link_hash_indirect
3064 || h
->root
.type
== bfd_link_hash_warning
)
3065 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3067 /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
3068 avoid optimizing _DYNAMIC since ld.so may use its link-time
3071 && h
->type
!= STT_GNU_IFUNC
3072 && h
!= htab
->elf
.hdynamic
3073 && SYMBOL_REFERENCES_LOCAL (link_info
, h
))
3075 tsec
= h
->root
.u
.def
.section
;
3076 toff
= h
->root
.u
.def
.value
;
3083 if (tsec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3085 /* At this stage in linking, no SEC_MERGE symbol has been
3086 adjusted, so all references to such symbols need to be
3087 passed through _bfd_merged_section_offset. (Later, in
3088 relocate_section, all SEC_MERGE symbols *except* for
3089 section symbols have been adjusted.)
3091 gas may reduce relocations against symbols in SEC_MERGE
3092 sections to a relocation against the section symbol when
3093 the original addend was zero. When the reloc is against
3094 a section symbol we should include the addend in the
3095 offset passed to _bfd_merged_section_offset, since the
3096 location of interest is the original symbol. On the
3097 other hand, an access to "sym+addend" where "sym" is not
3098 a section symbol should not include the addend; Such an
3099 access is presumed to be an offset from "sym"; The
3100 location of interest is just "sym". */
3101 if (symtype
== STT_SECTION
)
3102 toff
+= irel
->r_addend
;
3104 toff
= _bfd_merged_section_offset (abfd
, &tsec
,
3105 elf_section_data (tsec
)->sec_info
,
3108 if (symtype
!= STT_SECTION
)
3109 toff
+= irel
->r_addend
;
3112 toff
+= irel
->r_addend
;
3114 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3115 if (tsec
->output_section
== sec
->output_section
)
3117 if ((toff
- roff
+ 0x80000000) > 0xffffffff)
3125 /* At this point, we don't know the load addresses of TSEC
3126 section nor SEC section. We estimate the distrance between
3129 for (asect
= sec
->output_section
;
3130 asect
!= NULL
&& asect
!= tsec
->output_section
;
3131 asect
= asect
->next
)
3134 for (i
= asect
->output_section
->map_head
.s
;
3138 size
= align_power (size
, i
->alignment_power
);
3143 /* Don't convert R_X86_64_GOTPCREL if TSEC isn't placed after
3148 /* Take PT_GNU_RELRO segment into account by adding
3150 if ((toff
+ size
+ maxpagesize
- roff
+ 0x80000000)
3155 bfd_put_8 (abfd
, 0x8d, contents
+ roff
- 2);
3156 irel
->r_info
= htab
->r_info (r_symndx
, R_X86_64_PC32
);
3157 changed_contents
= TRUE
;
3158 changed_relocs
= TRUE
;
3162 if (h
->got
.refcount
> 0)
3163 h
->got
.refcount
-= 1;
3167 if (local_got_refcounts
!= NULL
3168 && local_got_refcounts
[r_symndx
] > 0)
3169 local_got_refcounts
[r_symndx
] -= 1;
3173 if (contents
!= NULL
3174 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3176 if (!changed_contents
&& !link_info
->keep_memory
)
3180 /* Cache the section contents for elf_link_input_bfd. */
3181 elf_section_data (sec
)->this_hdr
.contents
= contents
;
3185 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
3187 if (!changed_relocs
)
3188 free (internal_relocs
);
3190 elf_section_data (sec
)->relocs
= internal_relocs
;
3196 if (contents
!= NULL
3197 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
3199 if (internal_relocs
!= NULL
3200 && elf_section_data (sec
)->relocs
!= internal_relocs
)
3201 free (internal_relocs
);
3205 /* Set the sizes of the dynamic sections. */
3208 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
3209 struct bfd_link_info
*info
)
3211 struct elf_x86_64_link_hash_table
*htab
;
3216 const struct elf_backend_data
*bed
;
3218 htab
= elf_x86_64_hash_table (info
);
3221 bed
= get_elf_backend_data (output_bfd
);
3223 dynobj
= htab
->elf
.dynobj
;
3227 if (htab
->elf
.dynamic_sections_created
)
3229 /* Set the contents of the .interp section to the interpreter. */
3230 if (bfd_link_executable (info
) && !info
->nointerp
)
3232 s
= bfd_get_linker_section (dynobj
, ".interp");
3235 s
->size
= htab
->dynamic_interpreter_size
;
3236 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
3240 /* Set up .got offsets for local syms, and space for local dynamic
3242 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
3244 bfd_signed_vma
*local_got
;
3245 bfd_signed_vma
*end_local_got
;
3246 char *local_tls_type
;
3247 bfd_vma
*local_tlsdesc_gotent
;
3248 bfd_size_type locsymcount
;
3249 Elf_Internal_Shdr
*symtab_hdr
;
3252 if (! is_x86_64_elf (ibfd
))
3255 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3257 struct elf_dyn_relocs
*p
;
3259 if (!elf_x86_64_convert_mov_to_lea (ibfd
, s
, info
))
3262 for (p
= (struct elf_dyn_relocs
*)
3263 (elf_section_data (s
)->local_dynrel
);
3267 if (!bfd_is_abs_section (p
->sec
)
3268 && bfd_is_abs_section (p
->sec
->output_section
))
3270 /* Input section has been discarded, either because
3271 it is a copy of a linkonce section or due to
3272 linker script /DISCARD/, so we'll be discarding
3275 else if (p
->count
!= 0)
3277 srel
= elf_section_data (p
->sec
)->sreloc
;
3278 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
3279 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
3280 && (info
->flags
& DF_TEXTREL
) == 0)
3282 info
->flags
|= DF_TEXTREL
;
3283 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
3284 || info
->error_textrel
)
3285 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3286 p
->sec
->owner
, p
->sec
);
3292 local_got
= elf_local_got_refcounts (ibfd
);
3296 symtab_hdr
= &elf_symtab_hdr (ibfd
);
3297 locsymcount
= symtab_hdr
->sh_info
;
3298 end_local_got
= local_got
+ locsymcount
;
3299 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
3300 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
3302 srel
= htab
->elf
.srelgot
;
3303 for (; local_got
< end_local_got
;
3304 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
3306 *local_tlsdesc_gotent
= (bfd_vma
) -1;
3309 if (GOT_TLS_GDESC_P (*local_tls_type
))
3311 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
3312 - elf_x86_64_compute_jump_table_size (htab
);
3313 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
3314 *local_got
= (bfd_vma
) -2;
3316 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3317 || GOT_TLS_GD_P (*local_tls_type
))
3319 *local_got
= s
->size
;
3320 s
->size
+= GOT_ENTRY_SIZE
;
3321 if (GOT_TLS_GD_P (*local_tls_type
))
3322 s
->size
+= GOT_ENTRY_SIZE
;
3324 if (bfd_link_pic (info
)
3325 || GOT_TLS_GD_ANY_P (*local_tls_type
)
3326 || *local_tls_type
== GOT_TLS_IE
)
3328 if (GOT_TLS_GDESC_P (*local_tls_type
))
3330 htab
->elf
.srelplt
->size
3331 += bed
->s
->sizeof_rela
;
3332 htab
->tlsdesc_plt
= (bfd_vma
) -1;
3334 if (! GOT_TLS_GDESC_P (*local_tls_type
)
3335 || GOT_TLS_GD_P (*local_tls_type
))
3336 srel
->size
+= bed
->s
->sizeof_rela
;
3340 *local_got
= (bfd_vma
) -1;
3344 if (htab
->tls_ld_got
.refcount
> 0)
3346 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3348 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
3349 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
3350 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
3353 htab
->tls_ld_got
.offset
= -1;
3355 /* Allocate global sym .plt and .got entries, and space for global
3356 sym dynamic relocs. */
3357 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
3360 /* Allocate .plt and .got entries, and space for local symbols. */
3361 htab_traverse (htab
->loc_hash_table
,
3362 elf_x86_64_allocate_local_dynrelocs
,
3365 /* For every jump slot reserved in the sgotplt, reloc_count is
3366 incremented. However, when we reserve space for TLS descriptors,
3367 it's not incremented, so in order to compute the space reserved
3368 for them, it suffices to multiply the reloc count by the jump
3371 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3372 so that R_X86_64_IRELATIVE entries come last. */
3373 if (htab
->elf
.srelplt
)
3375 htab
->sgotplt_jump_table_size
3376 = elf_x86_64_compute_jump_table_size (htab
);
3377 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
3379 else if (htab
->elf
.irelplt
)
3380 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
3382 if (htab
->tlsdesc_plt
)
3384 /* If we're not using lazy TLS relocations, don't generate the
3385 PLT and GOT entries they require. */
3386 if ((info
->flags
& DF_BIND_NOW
))
3387 htab
->tlsdesc_plt
= 0;
3390 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
3391 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
3392 /* Reserve room for the initial entry.
3393 FIXME: we could probably do away with it in this case. */
3394 if (htab
->elf
.splt
->size
== 0)
3395 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3396 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
3397 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
3401 if (htab
->elf
.sgotplt
)
3403 /* Don't allocate .got.plt section if there are no GOT nor PLT
3404 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3405 if ((htab
->elf
.hgot
== NULL
3406 || !htab
->elf
.hgot
->ref_regular_nonweak
)
3407 && (htab
->elf
.sgotplt
->size
3408 == get_elf_backend_data (output_bfd
)->got_header_size
)
3409 && (htab
->elf
.splt
== NULL
3410 || htab
->elf
.splt
->size
== 0)
3411 && (htab
->elf
.sgot
== NULL
3412 || htab
->elf
.sgot
->size
== 0)
3413 && (htab
->elf
.iplt
== NULL
3414 || htab
->elf
.iplt
->size
== 0)
3415 && (htab
->elf
.igotplt
== NULL
3416 || htab
->elf
.igotplt
->size
== 0))
3417 htab
->elf
.sgotplt
->size
= 0;
3420 if (htab
->plt_eh_frame
!= NULL
3421 && htab
->elf
.splt
!= NULL
3422 && htab
->elf
.splt
->size
!= 0
3423 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
3424 && _bfd_elf_eh_frame_present (info
))
3426 const struct elf_x86_64_backend_data
*arch_data
3427 = get_elf_x86_64_arch_data (bed
);
3428 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
3431 /* We now have determined the sizes of the various dynamic sections.
3432 Allocate memory for them. */
3434 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3436 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3439 if (s
== htab
->elf
.splt
3440 || s
== htab
->elf
.sgot
3441 || s
== htab
->elf
.sgotplt
3442 || s
== htab
->elf
.iplt
3443 || s
== htab
->elf
.igotplt
3444 || s
== htab
->plt_bnd
3445 || s
== htab
->plt_got
3446 || s
== htab
->plt_eh_frame
3447 || s
== htab
->sdynbss
)
3449 /* Strip this section if we don't need it; see the
3452 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
3454 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
3457 /* We use the reloc_count field as a counter if we need
3458 to copy relocs into the output file. */
3459 if (s
!= htab
->elf
.srelplt
)
3464 /* It's not one of our sections, so don't allocate space. */
3470 /* If we don't need this section, strip it from the
3471 output file. This is mostly to handle .rela.bss and
3472 .rela.plt. We must create both sections in
3473 create_dynamic_sections, because they must be created
3474 before the linker maps input sections to output
3475 sections. The linker does that before
3476 adjust_dynamic_symbol is called, and it is that
3477 function which decides whether anything needs to go
3478 into these sections. */
3480 s
->flags
|= SEC_EXCLUDE
;
3484 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
3487 /* Allocate memory for the section contents. We use bfd_zalloc
3488 here in case unused entries are not reclaimed before the
3489 section's contents are written out. This should not happen,
3490 but this way if it does, we get a R_X86_64_NONE reloc instead
3492 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3493 if (s
->contents
== NULL
)
3497 if (htab
->plt_eh_frame
!= NULL
3498 && htab
->plt_eh_frame
->contents
!= NULL
)
3500 const struct elf_x86_64_backend_data
*arch_data
3501 = get_elf_x86_64_arch_data (bed
);
3503 memcpy (htab
->plt_eh_frame
->contents
,
3504 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
3505 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
3506 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
3509 if (htab
->elf
.dynamic_sections_created
)
3511 /* Add some entries to the .dynamic section. We fill in the
3512 values later, in elf_x86_64_finish_dynamic_sections, but we
3513 must add the entries now so that we get the correct size for
3514 the .dynamic section. The DT_DEBUG entry is filled in by the
3515 dynamic linker and used by the debugger. */
3516 #define add_dynamic_entry(TAG, VAL) \
3517 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3519 if (bfd_link_executable (info
))
3521 if (!add_dynamic_entry (DT_DEBUG
, 0))
3525 if (htab
->elf
.splt
->size
!= 0)
3527 /* DT_PLTGOT is used by prelink even if there is no PLT
3529 if (!add_dynamic_entry (DT_PLTGOT
, 0))
3532 if (htab
->elf
.srelplt
->size
!= 0)
3534 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
3535 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
3536 || !add_dynamic_entry (DT_JMPREL
, 0))
3540 if (htab
->tlsdesc_plt
3541 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
3542 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
3548 if (!add_dynamic_entry (DT_RELA
, 0)
3549 || !add_dynamic_entry (DT_RELASZ
, 0)
3550 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
3553 /* If any dynamic relocs apply to a read-only section,
3554 then we need a DT_TEXTREL entry. */
3555 if ((info
->flags
& DF_TEXTREL
) == 0)
3556 elf_link_hash_traverse (&htab
->elf
,
3557 elf_x86_64_readonly_dynrelocs
,
3560 if ((info
->flags
& DF_TEXTREL
) != 0)
3562 if ((elf_tdata (output_bfd
)->has_gnu_symbols
3563 & elf_gnu_symbol_ifunc
) == elf_gnu_symbol_ifunc
)
3565 info
->callbacks
->einfo
3566 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3567 bfd_set_error (bfd_error_bad_value
);
3571 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3576 #undef add_dynamic_entry
3582 elf_x86_64_always_size_sections (bfd
*output_bfd
,
3583 struct bfd_link_info
*info
)
3585 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
3589 struct elf_link_hash_entry
*tlsbase
;
3591 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
3592 "_TLS_MODULE_BASE_",
3593 FALSE
, FALSE
, FALSE
);
3595 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
3597 struct elf_x86_64_link_hash_table
*htab
;
3598 struct bfd_link_hash_entry
*bh
= NULL
;
3599 const struct elf_backend_data
*bed
3600 = get_elf_backend_data (output_bfd
);
3602 htab
= elf_x86_64_hash_table (info
);
3606 if (!(_bfd_generic_link_add_one_symbol
3607 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
3608 tls_sec
, 0, NULL
, FALSE
,
3609 bed
->collect
, &bh
)))
3612 htab
->tls_module_base
= bh
;
3614 tlsbase
= (struct elf_link_hash_entry
*)bh
;
3615 tlsbase
->def_regular
= 1;
3616 tlsbase
->other
= STV_HIDDEN
;
3617 tlsbase
->root
.linker_def
= 1;
3618 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
3625 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3626 executables. Rather than setting it to the beginning of the TLS
3627 section, we have to set it to the end. This function may be called
3628 multiple times, it is idempotent. */
3631 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
3633 struct elf_x86_64_link_hash_table
*htab
;
3634 struct bfd_link_hash_entry
*base
;
3636 if (!bfd_link_executable (info
))
3639 htab
= elf_x86_64_hash_table (info
);
3643 base
= htab
->tls_module_base
;
3647 base
->u
.def
.value
= htab
->elf
.tls_size
;
3650 /* Return the base VMA address which should be subtracted from real addresses
3651 when resolving @dtpoff relocation.
3652 This is PT_TLS segment p_vaddr. */
3655 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3657 /* If tls_sec is NULL, we should have signalled an error already. */
3658 if (elf_hash_table (info
)->tls_sec
== NULL
)
3660 return elf_hash_table (info
)->tls_sec
->vma
;
3663 /* Return the relocation value for @tpoff relocation
3664 if STT_TLS virtual address is ADDRESS. */
3667 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3669 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3670 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3671 bfd_vma static_tls_size
;
3673 /* If tls_segment is NULL, we should have signalled an error already. */
3674 if (htab
->tls_sec
== NULL
)
3677 /* Consider special static TLS alignment requirements. */
3678 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3679 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3682 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3686 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3688 /* Opcode Instruction
3691 0x0f 0x8x conditional jump */
3693 && (contents
[offset
- 1] == 0xe8
3694 || contents
[offset
- 1] == 0xe9))
3696 && contents
[offset
- 2] == 0x0f
3697 && (contents
[offset
- 1] & 0xf0) == 0x80));
3700 /* Relocate an x86_64 ELF section. */
3703 elf_x86_64_relocate_section (bfd
*output_bfd
,
3704 struct bfd_link_info
*info
,
3706 asection
*input_section
,
3708 Elf_Internal_Rela
*relocs
,
3709 Elf_Internal_Sym
*local_syms
,
3710 asection
**local_sections
)
3712 struct elf_x86_64_link_hash_table
*htab
;
3713 Elf_Internal_Shdr
*symtab_hdr
;
3714 struct elf_link_hash_entry
**sym_hashes
;
3715 bfd_vma
*local_got_offsets
;
3716 bfd_vma
*local_tlsdesc_gotents
;
3717 Elf_Internal_Rela
*rel
;
3718 Elf_Internal_Rela
*relend
;
3719 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3721 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3723 htab
= elf_x86_64_hash_table (info
);
3726 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3727 sym_hashes
= elf_sym_hashes (input_bfd
);
3728 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3729 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3731 elf_x86_64_set_tls_module_base (info
);
3734 relend
= relocs
+ input_section
->reloc_count
;
3735 for (; rel
< relend
; rel
++)
3737 unsigned int r_type
;
3738 reloc_howto_type
*howto
;
3739 unsigned long r_symndx
;
3740 struct elf_link_hash_entry
*h
;
3741 struct elf_x86_64_link_hash_entry
*eh
;
3742 Elf_Internal_Sym
*sym
;
3744 bfd_vma off
, offplt
, plt_offset
;
3746 bfd_boolean unresolved_reloc
;
3747 bfd_reloc_status_type r
;
3749 asection
*base_got
, *resolved_plt
;
3752 r_type
= ELF32_R_TYPE (rel
->r_info
);
3753 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3754 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3757 if (r_type
>= (int) R_X86_64_standard
)
3759 (*_bfd_error_handler
)
3760 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3761 input_bfd
, input_section
, r_type
);
3762 bfd_set_error (bfd_error_bad_value
);
3766 if (r_type
!= (int) R_X86_64_32
3767 || ABI_64_P (output_bfd
))
3768 howto
= x86_64_elf_howto_table
+ r_type
;
3770 howto
= (x86_64_elf_howto_table
3771 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3772 r_symndx
= htab
->r_sym (rel
->r_info
);
3776 unresolved_reloc
= FALSE
;
3777 if (r_symndx
< symtab_hdr
->sh_info
)
3779 sym
= local_syms
+ r_symndx
;
3780 sec
= local_sections
[r_symndx
];
3782 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3784 st_size
= sym
->st_size
;
3786 /* Relocate against local STT_GNU_IFUNC symbol. */
3787 if (!bfd_link_relocatable (info
)
3788 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3790 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3795 /* Set STT_GNU_IFUNC symbol value. */
3796 h
->root
.u
.def
.value
= sym
->st_value
;
3797 h
->root
.u
.def
.section
= sec
;
3802 bfd_boolean warned ATTRIBUTE_UNUSED
;
3803 bfd_boolean ignored ATTRIBUTE_UNUSED
;
3805 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3806 r_symndx
, symtab_hdr
, sym_hashes
,
3808 unresolved_reloc
, warned
, ignored
);
3812 if (sec
!= NULL
&& discarded_section (sec
))
3813 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3814 rel
, 1, relend
, howto
, 0, contents
);
3816 if (bfd_link_relocatable (info
))
3819 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
3821 if (r_type
== R_X86_64_64
)
3823 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3824 zero-extend it to 64bit if addend is zero. */
3825 r_type
= R_X86_64_32
;
3826 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3828 else if (r_type
== R_X86_64_SIZE64
)
3830 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3831 zero-extend it to 64bit if addend is zero. */
3832 r_type
= R_X86_64_SIZE32
;
3833 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3837 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
3839 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3840 it here if it is defined in a non-shared object. */
3842 && h
->type
== STT_GNU_IFUNC
3848 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3850 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3851 sections because such sections are not SEC_ALLOC and
3852 thus ld.so will not process them. */
3853 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
3857 else if (h
->plt
.offset
== (bfd_vma
) -1)
3860 /* STT_GNU_IFUNC symbol must go through PLT. */
3861 if (htab
->elf
.splt
!= NULL
)
3863 if (htab
->plt_bnd
!= NULL
)
3865 resolved_plt
= htab
->plt_bnd
;
3866 plt_offset
= eh
->plt_bnd
.offset
;
3870 resolved_plt
= htab
->elf
.splt
;
3871 plt_offset
= h
->plt
.offset
;
3876 resolved_plt
= htab
->elf
.iplt
;
3877 plt_offset
= h
->plt
.offset
;
3880 relocation
= (resolved_plt
->output_section
->vma
3881 + resolved_plt
->output_offset
+ plt_offset
);
3886 if (h
->root
.root
.string
)
3887 name
= h
->root
.root
.string
;
3889 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3891 (*_bfd_error_handler
)
3892 (_("%B: relocation %s against STT_GNU_IFUNC "
3893 "symbol `%s' isn't handled by %s"), input_bfd
,
3894 x86_64_elf_howto_table
[r_type
].name
,
3895 name
, __FUNCTION__
);
3896 bfd_set_error (bfd_error_bad_value
);
3900 if (bfd_link_pic (info
))
3905 if (ABI_64_P (output_bfd
))
3909 if (rel
->r_addend
!= 0)
3911 if (h
->root
.root
.string
)
3912 name
= h
->root
.root
.string
;
3914 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3916 (*_bfd_error_handler
)
3917 (_("%B: relocation %s against STT_GNU_IFUNC "
3918 "symbol `%s' has non-zero addend: %d"),
3919 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
3920 name
, rel
->r_addend
);
3921 bfd_set_error (bfd_error_bad_value
);
3925 /* Generate dynamic relcoation only when there is a
3926 non-GOT reference in a shared object. */
3927 if (bfd_link_pic (info
) && h
->non_got_ref
)
3929 Elf_Internal_Rela outrel
;
3932 /* Need a dynamic relocation to get the real function
3934 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
3938 if (outrel
.r_offset
== (bfd_vma
) -1
3939 || outrel
.r_offset
== (bfd_vma
) -2)
3942 outrel
.r_offset
+= (input_section
->output_section
->vma
3943 + input_section
->output_offset
);
3945 if (h
->dynindx
== -1
3947 || bfd_link_executable (info
))
3949 /* This symbol is resolved locally. */
3950 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3951 outrel
.r_addend
= (h
->root
.u
.def
.value
3952 + h
->root
.u
.def
.section
->output_section
->vma
3953 + h
->root
.u
.def
.section
->output_offset
);
3957 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3958 outrel
.r_addend
= 0;
3961 sreloc
= htab
->elf
.irelifunc
;
3962 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3964 /* If this reloc is against an external symbol, we
3965 do not want to fiddle with the addend. Otherwise,
3966 we need to include the symbol value so that it
3967 becomes an addend for the dynamic reloc. For an
3968 internal symbol, we have updated addend. */
3973 case R_X86_64_PC32_BND
:
3975 case R_X86_64_PLT32
:
3976 case R_X86_64_PLT32_BND
:
3979 case R_X86_64_GOTPCREL
:
3980 case R_X86_64_GOTPCREL64
:
3981 base_got
= htab
->elf
.sgot
;
3982 off
= h
->got
.offset
;
3984 if (base_got
== NULL
)
3987 if (off
== (bfd_vma
) -1)
3989 /* We can't use h->got.offset here to save state, or
3990 even just remember the offset, as finish_dynamic_symbol
3991 would use that as offset into .got. */
3993 if (htab
->elf
.splt
!= NULL
)
3995 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3996 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3997 base_got
= htab
->elf
.sgotplt
;
4001 plt_index
= h
->plt
.offset
/ plt_entry_size
;
4002 off
= plt_index
* GOT_ENTRY_SIZE
;
4003 base_got
= htab
->elf
.igotplt
;
4006 if (h
->dynindx
== -1
4010 /* This references the local defitionion. We must
4011 initialize this entry in the global offset table.
4012 Since the offset must always be a multiple of 8,
4013 we use the least significant bit to record
4014 whether we have initialized it already.
4016 When doing a dynamic link, we create a .rela.got
4017 relocation entry to initialize the value. This
4018 is done in the finish_dynamic_symbol routine. */
4023 bfd_put_64 (output_bfd
, relocation
,
4024 base_got
->contents
+ off
);
4025 /* Note that this is harmless for the GOTPLT64
4026 case, as -1 | 1 still is -1. */
4032 relocation
= (base_got
->output_section
->vma
4033 + base_got
->output_offset
+ off
);
4039 /* When generating a shared object, the relocations handled here are
4040 copied into the output file to be resolved at run time. */
4043 case R_X86_64_GOT32
:
4044 case R_X86_64_GOT64
:
4045 /* Relocation is to the entry for this symbol in the global
4047 case R_X86_64_GOTPCREL
:
4048 case R_X86_64_GOTPCREL64
:
4049 /* Use global offset table entry as symbol value. */
4050 case R_X86_64_GOTPLT64
:
4051 /* This is obsolete and treated the the same as GOT64. */
4052 base_got
= htab
->elf
.sgot
;
4054 if (htab
->elf
.sgot
== NULL
)
4061 off
= h
->got
.offset
;
4063 && h
->plt
.offset
!= (bfd_vma
)-1
4064 && off
== (bfd_vma
)-1)
4066 /* We can't use h->got.offset here to save
4067 state, or even just remember the offset, as
4068 finish_dynamic_symbol would use that as offset into
4070 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
4071 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
4072 base_got
= htab
->elf
.sgotplt
;
4075 dyn
= htab
->elf
.dynamic_sections_created
;
4077 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
4078 || (bfd_link_pic (info
)
4079 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4080 || (ELF_ST_VISIBILITY (h
->other
)
4081 && h
->root
.type
== bfd_link_hash_undefweak
))
4083 /* This is actually a static link, or it is a -Bsymbolic
4084 link and the symbol is defined locally, or the symbol
4085 was forced to be local because of a version file. We
4086 must initialize this entry in the global offset table.
4087 Since the offset must always be a multiple of 8, we
4088 use the least significant bit to record whether we
4089 have initialized it already.
4091 When doing a dynamic link, we create a .rela.got
4092 relocation entry to initialize the value. This is
4093 done in the finish_dynamic_symbol routine. */
4098 bfd_put_64 (output_bfd
, relocation
,
4099 base_got
->contents
+ off
);
4100 /* Note that this is harmless for the GOTPLT64 case,
4101 as -1 | 1 still is -1. */
4106 unresolved_reloc
= FALSE
;
4110 if (local_got_offsets
== NULL
)
4113 off
= local_got_offsets
[r_symndx
];
4115 /* The offset must always be a multiple of 8. We use
4116 the least significant bit to record whether we have
4117 already generated the necessary reloc. */
4122 bfd_put_64 (output_bfd
, relocation
,
4123 base_got
->contents
+ off
);
4125 if (bfd_link_pic (info
))
4128 Elf_Internal_Rela outrel
;
4130 /* We need to generate a R_X86_64_RELATIVE reloc
4131 for the dynamic linker. */
4132 s
= htab
->elf
.srelgot
;
4136 outrel
.r_offset
= (base_got
->output_section
->vma
4137 + base_got
->output_offset
4139 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4140 outrel
.r_addend
= relocation
;
4141 elf_append_rela (output_bfd
, s
, &outrel
);
4144 local_got_offsets
[r_symndx
] |= 1;
4148 if (off
>= (bfd_vma
) -2)
4151 relocation
= base_got
->output_section
->vma
4152 + base_got
->output_offset
+ off
;
4153 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
4154 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4155 - htab
->elf
.sgotplt
->output_offset
;
4159 case R_X86_64_GOTOFF64
:
4160 /* Relocation is relative to the start of the global offset
4163 /* Check to make sure it isn't a protected function or data
4164 symbol for shared library since it may not be local when
4165 used as function address or with copy relocation. We also
4166 need to make sure that a symbol is referenced locally. */
4167 if (bfd_link_pic (info
) && h
)
4169 if (!h
->def_regular
)
4173 switch (ELF_ST_VISIBILITY (h
->other
))
4176 v
= _("hidden symbol");
4179 v
= _("internal symbol");
4182 v
= _("protected symbol");
4189 (*_bfd_error_handler
)
4190 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4191 input_bfd
, v
, h
->root
.root
.string
);
4192 bfd_set_error (bfd_error_bad_value
);
4195 else if (!bfd_link_executable (info
)
4196 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
4197 && (h
->type
== STT_FUNC
4198 || h
->type
== STT_OBJECT
)
4199 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
4201 (*_bfd_error_handler
)
4202 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4204 h
->type
== STT_FUNC
? "function" : "data",
4205 h
->root
.root
.string
);
4206 bfd_set_error (bfd_error_bad_value
);
4211 /* Note that sgot is not involved in this
4212 calculation. We always want the start of .got.plt. If we
4213 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4214 permitted by the ABI, we might have to change this
4216 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4217 + htab
->elf
.sgotplt
->output_offset
;
4220 case R_X86_64_GOTPC32
:
4221 case R_X86_64_GOTPC64
:
4222 /* Use global offset table as symbol value. */
4223 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4224 + htab
->elf
.sgotplt
->output_offset
;
4225 unresolved_reloc
= FALSE
;
4228 case R_X86_64_PLTOFF64
:
4229 /* Relocation is PLT entry relative to GOT. For local
4230 symbols it's the symbol itself relative to GOT. */
4232 /* See PLT32 handling. */
4233 && h
->plt
.offset
!= (bfd_vma
) -1
4234 && htab
->elf
.splt
!= NULL
)
4236 if (htab
->plt_bnd
!= NULL
)
4238 resolved_plt
= htab
->plt_bnd
;
4239 plt_offset
= eh
->plt_bnd
.offset
;
4243 resolved_plt
= htab
->elf
.splt
;
4244 plt_offset
= h
->plt
.offset
;
4247 relocation
= (resolved_plt
->output_section
->vma
4248 + resolved_plt
->output_offset
4250 unresolved_reloc
= FALSE
;
4253 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
4254 + htab
->elf
.sgotplt
->output_offset
;
4257 case R_X86_64_PLT32
:
4258 case R_X86_64_PLT32_BND
:
4259 /* Relocation is to the entry for this symbol in the
4260 procedure linkage table. */
4262 /* Resolve a PLT32 reloc against a local symbol directly,
4263 without using the procedure linkage table. */
4267 if ((h
->plt
.offset
== (bfd_vma
) -1
4268 && eh
->plt_got
.offset
== (bfd_vma
) -1)
4269 || htab
->elf
.splt
== NULL
)
4271 /* We didn't make a PLT entry for this symbol. This
4272 happens when statically linking PIC code, or when
4273 using -Bsymbolic. */
4277 if (h
->plt
.offset
!= (bfd_vma
) -1)
4279 if (htab
->plt_bnd
!= NULL
)
4281 resolved_plt
= htab
->plt_bnd
;
4282 plt_offset
= eh
->plt_bnd
.offset
;
4286 resolved_plt
= htab
->elf
.splt
;
4287 plt_offset
= h
->plt
.offset
;
4292 /* Use the GOT PLT. */
4293 resolved_plt
= htab
->plt_got
;
4294 plt_offset
= eh
->plt_got
.offset
;
4297 relocation
= (resolved_plt
->output_section
->vma
4298 + resolved_plt
->output_offset
4300 unresolved_reloc
= FALSE
;
4303 case R_X86_64_SIZE32
:
4304 case R_X86_64_SIZE64
:
4305 /* Set to symbol size. */
4306 relocation
= st_size
;
4312 case R_X86_64_PC32_BND
:
4313 /* Don't complain about -fPIC if the symbol is undefined when
4314 building executable. */
4315 if (bfd_link_pic (info
)
4316 && (input_section
->flags
& SEC_ALLOC
) != 0
4317 && (input_section
->flags
& SEC_READONLY
) != 0
4319 && !(bfd_link_executable (info
)
4320 && h
->root
.type
== bfd_link_hash_undefined
))
4322 bfd_boolean fail
= FALSE
;
4324 = ((r_type
== R_X86_64_PC32
4325 || r_type
== R_X86_64_PC32_BND
)
4326 && is_32bit_relative_branch (contents
, rel
->r_offset
));
4328 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
4330 /* Symbol is referenced locally. Make sure it is
4331 defined locally or for a branch. */
4332 fail
= !h
->def_regular
&& !branch
;
4334 else if (!(bfd_link_executable (info
)
4335 && (h
->needs_copy
|| eh
->needs_copy
)))
4337 /* Symbol doesn't need copy reloc and isn't referenced
4338 locally. We only allow branch to symbol with
4339 non-default visibility. */
4341 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
4348 const char *pic
= "";
4350 switch (ELF_ST_VISIBILITY (h
->other
))
4353 v
= _("hidden symbol");
4356 v
= _("internal symbol");
4359 v
= _("protected symbol");
4363 pic
= _("; recompile with -fPIC");
4368 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4370 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4372 (*_bfd_error_handler
) (fmt
, input_bfd
,
4373 x86_64_elf_howto_table
[r_type
].name
,
4374 v
, h
->root
.root
.string
, pic
);
4375 bfd_set_error (bfd_error_bad_value
);
4386 /* FIXME: The ABI says the linker should make sure the value is
4387 the same when it's zeroextended to 64 bit. */
4390 if ((input_section
->flags
& SEC_ALLOC
) == 0)
4393 /* Don't copy a pc-relative relocation into the output file
4394 if the symbol needs copy reloc or the symbol is undefined
4395 when building executable. Copy dynamic function pointer
4397 if ((bfd_link_pic (info
)
4398 && !(bfd_link_executable (info
)
4402 || h
->root
.type
== bfd_link_hash_undefined
)
4403 && IS_X86_64_PCREL_TYPE (r_type
))
4405 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
4406 || h
->root
.type
!= bfd_link_hash_undefweak
)
4407 && ((! IS_X86_64_PCREL_TYPE (r_type
)
4408 && r_type
!= R_X86_64_SIZE32
4409 && r_type
!= R_X86_64_SIZE64
)
4410 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
4411 || (ELIMINATE_COPY_RELOCS
4412 && !bfd_link_pic (info
)
4415 && (!h
->non_got_ref
|| eh
->func_pointer_refcount
> 0)
4418 || h
->root
.type
== bfd_link_hash_undefweak
4419 || h
->root
.type
== bfd_link_hash_undefined
)))
4421 Elf_Internal_Rela outrel
;
4422 bfd_boolean skip
, relocate
;
4425 /* When generating a shared object, these relocations
4426 are copied into the output file to be resolved at run
4432 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4434 if (outrel
.r_offset
== (bfd_vma
) -1)
4436 else if (outrel
.r_offset
== (bfd_vma
) -2)
4437 skip
= TRUE
, relocate
= TRUE
;
4439 outrel
.r_offset
+= (input_section
->output_section
->vma
4440 + input_section
->output_offset
);
4443 memset (&outrel
, 0, sizeof outrel
);
4445 /* h->dynindx may be -1 if this symbol was marked to
4449 && (IS_X86_64_PCREL_TYPE (r_type
)
4450 || ! bfd_link_pic (info
)
4451 || ! SYMBOLIC_BIND (info
, h
)
4452 || ! h
->def_regular
))
4454 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
4455 outrel
.r_addend
= rel
->r_addend
;
4459 /* This symbol is local, or marked to become local. */
4460 if (r_type
== htab
->pointer_r_type
)
4463 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4464 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4466 else if (r_type
== R_X86_64_64
4467 && !ABI_64_P (output_bfd
))
4470 outrel
.r_info
= htab
->r_info (0,
4471 R_X86_64_RELATIVE64
);
4472 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4473 /* Check addend overflow. */
4474 if ((outrel
.r_addend
& 0x80000000)
4475 != (rel
->r_addend
& 0x80000000))
4478 int addend
= rel
->r_addend
;
4479 if (h
&& h
->root
.root
.string
)
4480 name
= h
->root
.root
.string
;
4482 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
4485 (*_bfd_error_handler
)
4486 (_("%B: addend -0x%x in relocation %s against "
4487 "symbol `%s' at 0x%lx in section `%A' is "
4489 input_bfd
, input_section
, addend
,
4490 x86_64_elf_howto_table
[r_type
].name
,
4491 name
, (unsigned long) rel
->r_offset
);
4493 (*_bfd_error_handler
)
4494 (_("%B: addend 0x%x in relocation %s against "
4495 "symbol `%s' at 0x%lx in section `%A' is "
4497 input_bfd
, input_section
, addend
,
4498 x86_64_elf_howto_table
[r_type
].name
,
4499 name
, (unsigned long) rel
->r_offset
);
4500 bfd_set_error (bfd_error_bad_value
);
4508 if (bfd_is_abs_section (sec
))
4510 else if (sec
== NULL
|| sec
->owner
== NULL
)
4512 bfd_set_error (bfd_error_bad_value
);
4519 /* We are turning this relocation into one
4520 against a section symbol. It would be
4521 proper to subtract the symbol's value,
4522 osec->vma, from the emitted reloc addend,
4523 but ld.so expects buggy relocs. */
4524 osec
= sec
->output_section
;
4525 sindx
= elf_section_data (osec
)->dynindx
;
4528 asection
*oi
= htab
->elf
.text_index_section
;
4529 sindx
= elf_section_data (oi
)->dynindx
;
4531 BFD_ASSERT (sindx
!= 0);
4534 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
4535 outrel
.r_addend
= relocation
+ rel
->r_addend
;
4539 sreloc
= elf_section_data (input_section
)->sreloc
;
4541 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
4543 r
= bfd_reloc_notsupported
;
4544 goto check_relocation_error
;
4547 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4549 /* If this reloc is against an external symbol, we do
4550 not want to fiddle with the addend. Otherwise, we
4551 need to include the symbol value so that it becomes
4552 an addend for the dynamic reloc. */
4559 case R_X86_64_TLSGD
:
4560 case R_X86_64_GOTPC32_TLSDESC
:
4561 case R_X86_64_TLSDESC_CALL
:
4562 case R_X86_64_GOTTPOFF
:
4563 tls_type
= GOT_UNKNOWN
;
4564 if (h
== NULL
&& local_got_offsets
)
4565 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
4567 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
4569 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4570 input_section
, contents
,
4571 symtab_hdr
, sym_hashes
,
4572 &r_type
, tls_type
, rel
,
4573 relend
, h
, r_symndx
))
4576 if (r_type
== R_X86_64_TPOFF32
)
4578 bfd_vma roff
= rel
->r_offset
;
4580 BFD_ASSERT (! unresolved_reloc
);
4582 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4584 /* GD->LE transition. For 64bit, change
4585 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4586 .word 0x6666; rex64; call __tls_get_addr
4589 leaq foo@tpoff(%rax), %rax
4591 leaq foo@tlsgd(%rip), %rdi
4592 .word 0x6666; rex64; call __tls_get_addr
4595 leaq foo@tpoff(%rax), %rax
4596 For largepic, change:
4597 leaq foo@tlsgd(%rip), %rdi
4598 movabsq $__tls_get_addr@pltoff, %rax
4603 leaq foo@tpoff(%rax), %rax
4604 nopw 0x0(%rax,%rax,1) */
4606 if (ABI_64_P (output_bfd
)
4607 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4609 memcpy (contents
+ roff
- 3,
4610 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4611 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4614 else if (ABI_64_P (output_bfd
))
4615 memcpy (contents
+ roff
- 4,
4616 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4619 memcpy (contents
+ roff
- 3,
4620 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4622 bfd_put_32 (output_bfd
,
4623 elf_x86_64_tpoff (info
, relocation
),
4624 contents
+ roff
+ 8 + largepic
);
4625 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4629 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4631 /* GDesc -> LE transition.
4632 It's originally something like:
4633 leaq x@tlsdesc(%rip), %rax
4636 movl $x@tpoff, %rax. */
4638 unsigned int val
, type
;
4640 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4641 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4642 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
4643 contents
+ roff
- 3);
4644 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
4645 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
4646 contents
+ roff
- 1);
4647 bfd_put_32 (output_bfd
,
4648 elf_x86_64_tpoff (info
, relocation
),
4652 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4654 /* GDesc -> LE transition.
4659 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4660 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4663 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
4665 /* IE->LE transition:
4666 For 64bit, originally it can be one of:
4667 movq foo@gottpoff(%rip), %reg
4668 addq foo@gottpoff(%rip), %reg
4671 leaq foo(%reg), %reg
4673 For 32bit, originally it can be one of:
4674 movq foo@gottpoff(%rip), %reg
4675 addl foo@gottpoff(%rip), %reg
4678 leal foo(%reg), %reg
4681 unsigned int val
, type
, reg
;
4684 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
4687 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
4688 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
4694 bfd_put_8 (output_bfd
, 0x49,
4695 contents
+ roff
- 3);
4696 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4697 bfd_put_8 (output_bfd
, 0x41,
4698 contents
+ roff
- 3);
4699 bfd_put_8 (output_bfd
, 0xc7,
4700 contents
+ roff
- 2);
4701 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4702 contents
+ roff
- 1);
4706 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4709 bfd_put_8 (output_bfd
, 0x49,
4710 contents
+ roff
- 3);
4711 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4712 bfd_put_8 (output_bfd
, 0x41,
4713 contents
+ roff
- 3);
4714 bfd_put_8 (output_bfd
, 0x81,
4715 contents
+ roff
- 2);
4716 bfd_put_8 (output_bfd
, 0xc0 | reg
,
4717 contents
+ roff
- 1);
4721 /* addq/addl -> leaq/leal */
4723 bfd_put_8 (output_bfd
, 0x4d,
4724 contents
+ roff
- 3);
4725 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
4726 bfd_put_8 (output_bfd
, 0x45,
4727 contents
+ roff
- 3);
4728 bfd_put_8 (output_bfd
, 0x8d,
4729 contents
+ roff
- 2);
4730 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
4731 contents
+ roff
- 1);
4733 bfd_put_32 (output_bfd
,
4734 elf_x86_64_tpoff (info
, relocation
),
4742 if (htab
->elf
.sgot
== NULL
)
4747 off
= h
->got
.offset
;
4748 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
4752 if (local_got_offsets
== NULL
)
4755 off
= local_got_offsets
[r_symndx
];
4756 offplt
= local_tlsdesc_gotents
[r_symndx
];
4763 Elf_Internal_Rela outrel
;
4767 if (htab
->elf
.srelgot
== NULL
)
4770 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
4772 if (GOT_TLS_GDESC_P (tls_type
))
4774 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
4775 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
4776 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
4777 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
4778 + htab
->elf
.sgotplt
->output_offset
4780 + htab
->sgotplt_jump_table_size
);
4781 sreloc
= htab
->elf
.srelplt
;
4783 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4785 outrel
.r_addend
= 0;
4786 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4789 sreloc
= htab
->elf
.srelgot
;
4791 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4792 + htab
->elf
.sgot
->output_offset
+ off
);
4794 if (GOT_TLS_GD_P (tls_type
))
4795 dr_type
= R_X86_64_DTPMOD64
;
4796 else if (GOT_TLS_GDESC_P (tls_type
))
4799 dr_type
= R_X86_64_TPOFF64
;
4801 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
4802 outrel
.r_addend
= 0;
4803 if ((dr_type
== R_X86_64_TPOFF64
4804 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
4805 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4806 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4808 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4810 if (GOT_TLS_GD_P (tls_type
))
4814 BFD_ASSERT (! unresolved_reloc
);
4815 bfd_put_64 (output_bfd
,
4816 relocation
- elf_x86_64_dtpoff_base (info
),
4817 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4821 bfd_put_64 (output_bfd
, 0,
4822 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4823 outrel
.r_info
= htab
->r_info (indx
,
4825 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4826 elf_append_rela (output_bfd
, sreloc
,
4835 local_got_offsets
[r_symndx
] |= 1;
4838 if (off
>= (bfd_vma
) -2
4839 && ! GOT_TLS_GDESC_P (tls_type
))
4841 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4843 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4844 || r_type
== R_X86_64_TLSDESC_CALL
)
4845 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4846 + htab
->elf
.sgotplt
->output_offset
4847 + offplt
+ htab
->sgotplt_jump_table_size
;
4849 relocation
= htab
->elf
.sgot
->output_section
->vma
4850 + htab
->elf
.sgot
->output_offset
+ off
;
4851 unresolved_reloc
= FALSE
;
4855 bfd_vma roff
= rel
->r_offset
;
4857 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4859 /* GD->IE transition. For 64bit, change
4860 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4861 .word 0x6666; rex64; call __tls_get_addr@plt
4864 addq foo@gottpoff(%rip), %rax
4866 leaq foo@tlsgd(%rip), %rdi
4867 .word 0x6666; rex64; call __tls_get_addr@plt
4870 addq foo@gottpoff(%rip), %rax
4871 For largepic, change:
4872 leaq foo@tlsgd(%rip), %rdi
4873 movabsq $__tls_get_addr@pltoff, %rax
4878 addq foo@gottpoff(%rax), %rax
4879 nopw 0x0(%rax,%rax,1) */
4881 if (ABI_64_P (output_bfd
)
4882 && contents
[roff
+ 5] == (bfd_byte
) '\xb8')
4884 memcpy (contents
+ roff
- 3,
4885 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4886 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4889 else if (ABI_64_P (output_bfd
))
4890 memcpy (contents
+ roff
- 4,
4891 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4894 memcpy (contents
+ roff
- 3,
4895 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4898 relocation
= (htab
->elf
.sgot
->output_section
->vma
4899 + htab
->elf
.sgot
->output_offset
+ off
4902 - input_section
->output_section
->vma
4903 - input_section
->output_offset
4905 bfd_put_32 (output_bfd
, relocation
,
4906 contents
+ roff
+ 8 + largepic
);
4907 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4911 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4913 /* GDesc -> IE transition.
4914 It's originally something like:
4915 leaq x@tlsdesc(%rip), %rax
4918 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4920 /* Now modify the instruction as appropriate. To
4921 turn a leaq into a movq in the form we use it, it
4922 suffices to change the second byte from 0x8d to
4924 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4926 bfd_put_32 (output_bfd
,
4927 htab
->elf
.sgot
->output_section
->vma
4928 + htab
->elf
.sgot
->output_offset
+ off
4930 - input_section
->output_section
->vma
4931 - input_section
->output_offset
4936 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4938 /* GDesc -> IE transition.
4945 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4946 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4954 case R_X86_64_TLSLD
:
4955 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4956 input_section
, contents
,
4957 symtab_hdr
, sym_hashes
,
4958 &r_type
, GOT_UNKNOWN
,
4959 rel
, relend
, h
, r_symndx
))
4962 if (r_type
!= R_X86_64_TLSLD
)
4964 /* LD->LE transition:
4965 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4966 For 64bit, we change it into:
4967 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4968 For 32bit, we change it into:
4969 nopl 0x0(%rax); movl %fs:0, %eax.
4970 For largepic, change:
4971 leaq foo@tlsgd(%rip), %rdi
4972 movabsq $__tls_get_addr@pltoff, %rax
4976 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
4979 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
4980 if (ABI_64_P (output_bfd
)
4981 && contents
[rel
->r_offset
+ 5] == (bfd_byte
) '\xb8')
4982 memcpy (contents
+ rel
->r_offset
- 3,
4983 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4984 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4985 else if (ABI_64_P (output_bfd
))
4986 memcpy (contents
+ rel
->r_offset
- 3,
4987 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4989 memcpy (contents
+ rel
->r_offset
- 3,
4990 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4991 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4996 if (htab
->elf
.sgot
== NULL
)
4999 off
= htab
->tls_ld_got
.offset
;
5004 Elf_Internal_Rela outrel
;
5006 if (htab
->elf
.srelgot
== NULL
)
5009 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5010 + htab
->elf
.sgot
->output_offset
+ off
);
5012 bfd_put_64 (output_bfd
, 0,
5013 htab
->elf
.sgot
->contents
+ off
);
5014 bfd_put_64 (output_bfd
, 0,
5015 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
5016 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
5017 outrel
.r_addend
= 0;
5018 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
5020 htab
->tls_ld_got
.offset
|= 1;
5022 relocation
= htab
->elf
.sgot
->output_section
->vma
5023 + htab
->elf
.sgot
->output_offset
+ off
;
5024 unresolved_reloc
= FALSE
;
5027 case R_X86_64_DTPOFF32
:
5028 if (!bfd_link_executable (info
)
5029 || (input_section
->flags
& SEC_CODE
) == 0)
5030 relocation
-= elf_x86_64_dtpoff_base (info
);
5032 relocation
= elf_x86_64_tpoff (info
, relocation
);
5035 case R_X86_64_TPOFF32
:
5036 case R_X86_64_TPOFF64
:
5037 BFD_ASSERT (bfd_link_executable (info
));
5038 relocation
= elf_x86_64_tpoff (info
, relocation
);
5041 case R_X86_64_DTPOFF64
:
5042 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
5043 relocation
-= elf_x86_64_dtpoff_base (info
);
5050 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5051 because such sections are not SEC_ALLOC and thus ld.so will
5052 not process them. */
5053 if (unresolved_reloc
5054 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
5056 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
5057 rel
->r_offset
) != (bfd_vma
) -1)
5059 (*_bfd_error_handler
)
5060 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5063 (long) rel
->r_offset
,
5065 h
->root
.root
.string
);
5070 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
5071 contents
, rel
->r_offset
,
5072 relocation
, rel
->r_addend
);
5074 check_relocation_error
:
5075 if (r
!= bfd_reloc_ok
)
5080 name
= h
->root
.root
.string
;
5083 name
= bfd_elf_string_from_elf_section (input_bfd
,
5084 symtab_hdr
->sh_link
,
5089 name
= bfd_section_name (input_bfd
, sec
);
5092 if (r
== bfd_reloc_overflow
)
5094 if (! ((*info
->callbacks
->reloc_overflow
)
5095 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
5096 (bfd_vma
) 0, input_bfd
, input_section
,
5102 (*_bfd_error_handler
)
5103 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5104 input_bfd
, input_section
,
5105 (long) rel
->r_offset
, name
, (int) r
);
5114 /* Finish up dynamic symbol handling. We set the contents of various
5115 dynamic sections here. */
5118 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
5119 struct bfd_link_info
*info
,
5120 struct elf_link_hash_entry
*h
,
5121 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
5123 struct elf_x86_64_link_hash_table
*htab
;
5124 const struct elf_x86_64_backend_data
*abed
;
5125 bfd_boolean use_plt_bnd
;
5126 struct elf_x86_64_link_hash_entry
*eh
;
5128 htab
= elf_x86_64_hash_table (info
);
5132 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5133 section only if there is .plt section. */
5134 use_plt_bnd
= htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
;
5136 ? &elf_x86_64_bnd_arch_bed
5137 : get_elf_x86_64_backend_data (output_bfd
));
5139 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
5141 if (h
->plt
.offset
!= (bfd_vma
) -1)
5144 bfd_vma got_offset
, plt_offset
, plt_plt_offset
, plt_got_offset
;
5145 bfd_vma plt_plt_insn_end
, plt_got_insn_size
;
5146 Elf_Internal_Rela rela
;
5148 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
5149 const struct elf_backend_data
*bed
;
5150 bfd_vma plt_got_pcrel_offset
;
5152 /* When building a static executable, use .iplt, .igot.plt and
5153 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5154 if (htab
->elf
.splt
!= NULL
)
5156 plt
= htab
->elf
.splt
;
5157 gotplt
= htab
->elf
.sgotplt
;
5158 relplt
= htab
->elf
.srelplt
;
5162 plt
= htab
->elf
.iplt
;
5163 gotplt
= htab
->elf
.igotplt
;
5164 relplt
= htab
->elf
.irelplt
;
5167 /* This symbol has an entry in the procedure linkage table. Set
5169 if ((h
->dynindx
== -1
5170 && !((h
->forced_local
|| bfd_link_executable (info
))
5172 && h
->type
== STT_GNU_IFUNC
))
5178 /* Get the index in the procedure linkage table which
5179 corresponds to this symbol. This is the index of this symbol
5180 in all the symbols for which we are making plt entries. The
5181 first entry in the procedure linkage table is reserved.
5183 Get the offset into the .got table of the entry that
5184 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5185 bytes. The first three are reserved for the dynamic linker.
5187 For static executables, we don't reserve anything. */
5189 if (plt
== htab
->elf
.splt
)
5191 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
5192 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
5196 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
5197 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
5200 plt_plt_insn_end
= abed
->plt_plt_insn_end
;
5201 plt_plt_offset
= abed
->plt_plt_offset
;
5202 plt_got_insn_size
= abed
->plt_got_insn_size
;
5203 plt_got_offset
= abed
->plt_got_offset
;
5206 /* Use the second PLT with BND relocations. */
5207 const bfd_byte
*plt_entry
, *plt2_entry
;
5209 if (eh
->has_bnd_reloc
)
5211 plt_entry
= elf_x86_64_bnd_plt_entry
;
5212 plt2_entry
= elf_x86_64_bnd_plt2_entry
;
5216 plt_entry
= elf_x86_64_legacy_plt_entry
;
5217 plt2_entry
= elf_x86_64_legacy_plt2_entry
;
5219 /* Subtract 1 since there is no BND prefix. */
5220 plt_plt_insn_end
-= 1;
5221 plt_plt_offset
-= 1;
5222 plt_got_insn_size
-= 1;
5223 plt_got_offset
-= 1;
5226 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry
)
5227 == sizeof (elf_x86_64_legacy_plt_entry
));
5229 /* Fill in the entry in the procedure linkage table. */
5230 memcpy (plt
->contents
+ h
->plt
.offset
,
5231 plt_entry
, sizeof (elf_x86_64_legacy_plt_entry
));
5232 /* Fill in the entry in the second PLT. */
5233 memcpy (htab
->plt_bnd
->contents
+ eh
->plt_bnd
.offset
,
5234 plt2_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5236 resolved_plt
= htab
->plt_bnd
;
5237 plt_offset
= eh
->plt_bnd
.offset
;
5241 /* Fill in the entry in the procedure linkage table. */
5242 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
5243 abed
->plt_entry_size
);
5246 plt_offset
= h
->plt
.offset
;
5249 /* Insert the relocation positions of the plt section. */
5251 /* Put offset the PC-relative instruction referring to the GOT entry,
5252 subtracting the size of that instruction. */
5253 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
5254 + gotplt
->output_offset
5256 - resolved_plt
->output_section
->vma
5257 - resolved_plt
->output_offset
5259 - plt_got_insn_size
);
5261 /* Check PC-relative offset overflow in PLT entry. */
5262 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
5263 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5264 output_bfd
, h
->root
.root
.string
);
5266 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
5267 resolved_plt
->contents
+ plt_offset
+ plt_got_offset
);
5269 /* Fill in the entry in the global offset table, initially this
5270 points to the second part of the PLT entry. */
5271 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5272 + plt
->output_offset
5273 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
5274 gotplt
->contents
+ got_offset
);
5276 /* Fill in the entry in the .rela.plt section. */
5277 rela
.r_offset
= (gotplt
->output_section
->vma
5278 + gotplt
->output_offset
5280 if (h
->dynindx
== -1
5281 || ((bfd_link_executable (info
)
5282 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
5284 && h
->type
== STT_GNU_IFUNC
))
5286 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5287 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5288 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
5289 rela
.r_addend
= (h
->root
.u
.def
.value
5290 + h
->root
.u
.def
.section
->output_section
->vma
5291 + h
->root
.u
.def
.section
->output_offset
);
5292 /* R_X86_64_IRELATIVE comes last. */
5293 plt_index
= htab
->next_irelative_index
--;
5297 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
5299 plt_index
= htab
->next_jump_slot_index
++;
5302 /* Don't fill PLT entry for static executables. */
5303 if (plt
== htab
->elf
.splt
)
5305 bfd_vma plt0_offset
= h
->plt
.offset
+ plt_plt_insn_end
;
5307 /* Put relocation index. */
5308 bfd_put_32 (output_bfd
, plt_index
,
5309 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
5311 /* Put offset for jmp .PLT0 and check for overflow. We don't
5312 check relocation index for overflow since branch displacement
5313 will overflow first. */
5314 if (plt0_offset
> 0x80000000)
5315 info
->callbacks
->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5316 output_bfd
, h
->root
.root
.string
);
5317 bfd_put_32 (output_bfd
, - plt0_offset
,
5318 plt
->contents
+ h
->plt
.offset
+ plt_plt_offset
);
5321 bed
= get_elf_backend_data (output_bfd
);
5322 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
5323 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
5325 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
5327 bfd_vma got_offset
, plt_offset
, plt_got_offset
, plt_got_insn_size
;
5328 asection
*plt
, *got
;
5329 bfd_boolean got_after_plt
;
5330 int32_t got_pcrel_offset
;
5331 const bfd_byte
*got_plt_entry
;
5333 /* Set the entry in the GOT procedure linkage table. */
5334 plt
= htab
->plt_got
;
5335 got
= htab
->elf
.sgot
;
5336 got_offset
= h
->got
.offset
;
5338 if (got_offset
== (bfd_vma
) -1
5339 || h
->type
== STT_GNU_IFUNC
5344 /* Use the second PLT entry template for the GOT PLT since they
5345 are the identical. */
5346 plt_got_insn_size
= elf_x86_64_bnd_arch_bed
.plt_got_insn_size
;
5347 plt_got_offset
= elf_x86_64_bnd_arch_bed
.plt_got_offset
;
5348 if (eh
->has_bnd_reloc
)
5349 got_plt_entry
= elf_x86_64_bnd_plt2_entry
;
5352 got_plt_entry
= elf_x86_64_legacy_plt2_entry
;
5354 /* Subtract 1 since there is no BND prefix. */
5355 plt_got_insn_size
-= 1;
5356 plt_got_offset
-= 1;
5359 /* Fill in the entry in the GOT procedure linkage table. */
5360 plt_offset
= eh
->plt_got
.offset
;
5361 memcpy (plt
->contents
+ plt_offset
,
5362 got_plt_entry
, sizeof (elf_x86_64_legacy_plt2_entry
));
5364 /* Put offset the PC-relative instruction referring to the GOT
5365 entry, subtracting the size of that instruction. */
5366 got_pcrel_offset
= (got
->output_section
->vma
5367 + got
->output_offset
5369 - plt
->output_section
->vma
5370 - plt
->output_offset
5372 - plt_got_insn_size
);
5374 /* Check PC-relative offset overflow in GOT PLT entry. */
5375 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
5376 if ((got_after_plt
&& got_pcrel_offset
< 0)
5377 || (!got_after_plt
&& got_pcrel_offset
> 0))
5378 info
->callbacks
->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5379 output_bfd
, h
->root
.root
.string
);
5381 bfd_put_32 (output_bfd
, got_pcrel_offset
,
5382 plt
->contents
+ plt_offset
+ plt_got_offset
);
5386 && (h
->plt
.offset
!= (bfd_vma
) -1
5387 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
5389 /* Mark the symbol as undefined, rather than as defined in
5390 the .plt section. Leave the value if there were any
5391 relocations where pointer equality matters (this is a clue
5392 for the dynamic linker, to make function pointer
5393 comparisons work between an application and shared
5394 library), otherwise set it to zero. If a function is only
5395 called from a binary, there is no need to slow down
5396 shared libraries because of that. */
5397 sym
->st_shndx
= SHN_UNDEF
;
5398 if (!h
->pointer_equality_needed
)
5402 if (h
->got
.offset
!= (bfd_vma
) -1
5403 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
5404 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
5406 Elf_Internal_Rela rela
;
5408 /* This symbol has an entry in the global offset table. Set it
5410 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
5413 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
5414 + htab
->elf
.sgot
->output_offset
5415 + (h
->got
.offset
&~ (bfd_vma
) 1));
5417 /* If this is a static link, or it is a -Bsymbolic link and the
5418 symbol is defined locally or was forced to be local because
5419 of a version file, we just want to emit a RELATIVE reloc.
5420 The entry in the global offset table will already have been
5421 initialized in the relocate_section function. */
5423 && h
->type
== STT_GNU_IFUNC
)
5425 if (bfd_link_pic (info
))
5427 /* Generate R_X86_64_GLOB_DAT. */
5434 if (!h
->pointer_equality_needed
)
5437 /* For non-shared object, we can't use .got.plt, which
5438 contains the real function addres if we need pointer
5439 equality. We load the GOT entry with the PLT entry. */
5440 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
5441 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
5442 + plt
->output_offset
5444 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5448 else if (bfd_link_pic (info
)
5449 && SYMBOL_REFERENCES_LOCAL (info
, h
))
5451 if (!h
->def_regular
)
5453 BFD_ASSERT((h
->got
.offset
& 1) != 0);
5454 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
5455 rela
.r_addend
= (h
->root
.u
.def
.value
5456 + h
->root
.u
.def
.section
->output_section
->vma
5457 + h
->root
.u
.def
.section
->output_offset
);
5461 BFD_ASSERT((h
->got
.offset
& 1) == 0);
5463 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5464 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
5465 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
5469 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
5474 Elf_Internal_Rela rela
;
5476 /* This symbol needs a copy reloc. Set it up. */
5478 if (h
->dynindx
== -1
5479 || (h
->root
.type
!= bfd_link_hash_defined
5480 && h
->root
.type
!= bfd_link_hash_defweak
)
5481 || htab
->srelbss
== NULL
)
5484 rela
.r_offset
= (h
->root
.u
.def
.value
5485 + h
->root
.u
.def
.section
->output_section
->vma
5486 + h
->root
.u
.def
.section
->output_offset
);
5487 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
5489 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
5495 /* Finish up local dynamic symbol handling. We set the contents of
5496 various dynamic sections here. */
5499 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
5501 struct elf_link_hash_entry
*h
5502 = (struct elf_link_hash_entry
*) *slot
;
5503 struct bfd_link_info
*info
5504 = (struct bfd_link_info
*) inf
;
5506 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
5510 /* Used to decide how to sort relocs in an optimal manner for the
5511 dynamic linker, before writing them out. */
5513 static enum elf_reloc_type_class
5514 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
5515 const asection
*rel_sec ATTRIBUTE_UNUSED
,
5516 const Elf_Internal_Rela
*rela
)
5518 bfd
*abfd
= info
->output_bfd
;
5519 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5520 struct elf_x86_64_link_hash_table
*htab
= elf_x86_64_hash_table (info
);
5521 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
5522 Elf_Internal_Sym sym
;
5524 if (htab
->elf
.dynsym
== NULL
5525 || !bed
->s
->swap_symbol_in (abfd
,
5526 (htab
->elf
.dynsym
->contents
5527 + r_symndx
* bed
->s
->sizeof_sym
),
5531 /* Check relocation against STT_GNU_IFUNC symbol. */
5532 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
5533 return reloc_class_ifunc
;
5535 switch ((int) ELF32_R_TYPE (rela
->r_info
))
5537 case R_X86_64_RELATIVE
:
5538 case R_X86_64_RELATIVE64
:
5539 return reloc_class_relative
;
5540 case R_X86_64_JUMP_SLOT
:
5541 return reloc_class_plt
;
5543 return reloc_class_copy
;
5545 return reloc_class_normal
;
5549 /* Finish up the dynamic sections. */
5552 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
5553 struct bfd_link_info
*info
)
5555 struct elf_x86_64_link_hash_table
*htab
;
5558 const struct elf_x86_64_backend_data
*abed
;
5560 htab
= elf_x86_64_hash_table (info
);
5564 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5565 section only if there is .plt section. */
5566 abed
= (htab
->elf
.splt
!= NULL
&& htab
->plt_bnd
!= NULL
5567 ? &elf_x86_64_bnd_arch_bed
5568 : get_elf_x86_64_backend_data (output_bfd
));
5570 dynobj
= htab
->elf
.dynobj
;
5571 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
5573 if (htab
->elf
.dynamic_sections_created
)
5575 bfd_byte
*dyncon
, *dynconend
;
5576 const struct elf_backend_data
*bed
;
5577 bfd_size_type sizeof_dyn
;
5579 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
5582 bed
= get_elf_backend_data (dynobj
);
5583 sizeof_dyn
= bed
->s
->sizeof_dyn
;
5584 dyncon
= sdyn
->contents
;
5585 dynconend
= sdyn
->contents
+ sdyn
->size
;
5586 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
5588 Elf_Internal_Dyn dyn
;
5591 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
5599 s
= htab
->elf
.sgotplt
;
5600 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
5604 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
5608 s
= htab
->elf
.srelplt
->output_section
;
5609 dyn
.d_un
.d_val
= s
->size
;
5613 /* The procedure linkage table relocs (DT_JMPREL) should
5614 not be included in the overall relocs (DT_RELA).
5615 Therefore, we override the DT_RELASZ entry here to
5616 make it not include the JMPREL relocs. Since the
5617 linker script arranges for .rela.plt to follow all
5618 other relocation sections, we don't have to worry
5619 about changing the DT_RELA entry. */
5620 if (htab
->elf
.srelplt
!= NULL
)
5622 s
= htab
->elf
.srelplt
->output_section
;
5623 dyn
.d_un
.d_val
-= s
->size
;
5627 case DT_TLSDESC_PLT
:
5629 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5630 + htab
->tlsdesc_plt
;
5633 case DT_TLSDESC_GOT
:
5635 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
5636 + htab
->tlsdesc_got
;
5640 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
5643 /* Fill in the special first entry in the procedure linkage table. */
5644 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
5646 /* Fill in the first entry in the procedure linkage table. */
5647 memcpy (htab
->elf
.splt
->contents
,
5648 abed
->plt0_entry
, abed
->plt_entry_size
);
5649 /* Add offset for pushq GOT+8(%rip), since the instruction
5650 uses 6 bytes subtract this value. */
5651 bfd_put_32 (output_bfd
,
5652 (htab
->elf
.sgotplt
->output_section
->vma
5653 + htab
->elf
.sgotplt
->output_offset
5655 - htab
->elf
.splt
->output_section
->vma
5656 - htab
->elf
.splt
->output_offset
5658 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
5659 /* Add offset for the PC-relative instruction accessing GOT+16,
5660 subtracting the offset to the end of that instruction. */
5661 bfd_put_32 (output_bfd
,
5662 (htab
->elf
.sgotplt
->output_section
->vma
5663 + htab
->elf
.sgotplt
->output_offset
5665 - htab
->elf
.splt
->output_section
->vma
5666 - htab
->elf
.splt
->output_offset
5667 - abed
->plt0_got2_insn_end
),
5668 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
5670 elf_section_data (htab
->elf
.splt
->output_section
)
5671 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
5673 if (htab
->tlsdesc_plt
)
5675 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
5676 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
5678 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
5679 abed
->plt0_entry
, abed
->plt_entry_size
);
5681 /* Add offset for pushq GOT+8(%rip), since the
5682 instruction uses 6 bytes subtract this value. */
5683 bfd_put_32 (output_bfd
,
5684 (htab
->elf
.sgotplt
->output_section
->vma
5685 + htab
->elf
.sgotplt
->output_offset
5687 - htab
->elf
.splt
->output_section
->vma
5688 - htab
->elf
.splt
->output_offset
5691 htab
->elf
.splt
->contents
5692 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
5693 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5694 where TGD stands for htab->tlsdesc_got, subtracting the offset
5695 to the end of that instruction. */
5696 bfd_put_32 (output_bfd
,
5697 (htab
->elf
.sgot
->output_section
->vma
5698 + htab
->elf
.sgot
->output_offset
5700 - htab
->elf
.splt
->output_section
->vma
5701 - htab
->elf
.splt
->output_offset
5703 - abed
->plt0_got2_insn_end
),
5704 htab
->elf
.splt
->contents
5705 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
5710 if (htab
->plt_bnd
!= NULL
)
5711 elf_section_data (htab
->plt_bnd
->output_section
)
5712 ->this_hdr
.sh_entsize
= sizeof (elf_x86_64_bnd_plt2_entry
);
5714 if (htab
->elf
.sgotplt
)
5716 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
5718 (*_bfd_error_handler
)
5719 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
5723 /* Fill in the first three entries in the global offset table. */
5724 if (htab
->elf
.sgotplt
->size
> 0)
5726 /* Set the first entry in the global offset table to the address of
5727 the dynamic section. */
5729 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
5731 bfd_put_64 (output_bfd
,
5732 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
5733 htab
->elf
.sgotplt
->contents
);
5734 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5735 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
5736 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
5739 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
5743 /* Adjust .eh_frame for .plt section. */
5744 if (htab
->plt_eh_frame
!= NULL
5745 && htab
->plt_eh_frame
->contents
!= NULL
)
5747 if (htab
->elf
.splt
!= NULL
5748 && htab
->elf
.splt
->size
!= 0
5749 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
5750 && htab
->elf
.splt
->output_section
!= NULL
5751 && htab
->plt_eh_frame
->output_section
!= NULL
)
5753 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
5754 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
5755 + htab
->plt_eh_frame
->output_offset
5756 + PLT_FDE_START_OFFSET
;
5757 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
5758 htab
->plt_eh_frame
->contents
5759 + PLT_FDE_START_OFFSET
);
5761 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
5763 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
5765 htab
->plt_eh_frame
->contents
))
5770 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
5771 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
5774 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5775 htab_traverse (htab
->loc_hash_table
,
5776 elf_x86_64_finish_local_dynamic_symbol
,
5782 /* Return an array of PLT entry symbol values. */
5785 elf_x86_64_get_plt_sym_val (bfd
*abfd
, asymbol
**dynsyms
, asection
*plt
,
5788 bfd_boolean (*slurp_relocs
) (bfd
*, asection
*, asymbol
**, bfd_boolean
);
5791 bfd_vma
*plt_sym_val
;
5793 bfd_byte
*plt_contents
;
5794 const struct elf_x86_64_backend_data
*bed
;
5795 Elf_Internal_Shdr
*hdr
;
5798 /* Get the .plt section contents. PLT passed down may point to the
5799 .plt.bnd section. Make sure that PLT always points to the .plt
5801 plt_bnd
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5806 plt
= bfd_get_section_by_name (abfd
, ".plt");
5809 bed
= &elf_x86_64_bnd_arch_bed
;
5812 bed
= get_elf_x86_64_backend_data (abfd
);
5814 plt_contents
= (bfd_byte
*) bfd_malloc (plt
->size
);
5815 if (plt_contents
== NULL
)
5817 if (!bfd_get_section_contents (abfd
, (asection
*) plt
,
5818 plt_contents
, 0, plt
->size
))
5821 free (plt_contents
);
5825 slurp_relocs
= get_elf_backend_data (abfd
)->s
->slurp_reloc_table
;
5826 if (! (*slurp_relocs
) (abfd
, relplt
, dynsyms
, TRUE
))
5829 hdr
= &elf_section_data (relplt
)->this_hdr
;
5830 count
= relplt
->size
/ hdr
->sh_entsize
;
5832 plt_sym_val
= (bfd_vma
*) bfd_malloc (sizeof (bfd_vma
) * count
);
5833 if (plt_sym_val
== NULL
)
5836 for (i
= 0; i
< count
; i
++)
5837 plt_sym_val
[i
] = -1;
5839 plt_offset
= bed
->plt_entry_size
;
5840 p
= relplt
->relocation
;
5841 for (i
= 0; i
< count
; i
++, p
++)
5845 /* Skip unknown relocation. */
5846 if (p
->howto
== NULL
)
5849 if (p
->howto
->type
!= R_X86_64_JUMP_SLOT
5850 && p
->howto
->type
!= R_X86_64_IRELATIVE
)
5853 reloc_index
= H_GET_32 (abfd
, (plt_contents
+ plt_offset
5854 + bed
->plt_reloc_offset
));
5855 if (reloc_index
>= count
)
5859 /* This is the index in .plt section. */
5860 long plt_index
= plt_offset
/ bed
->plt_entry_size
;
5861 /* Store VMA + the offset in .plt.bnd section. */
5862 plt_sym_val
[reloc_index
] =
5864 + (plt_index
- 1) * sizeof (elf_x86_64_legacy_plt2_entry
));
5867 plt_sym_val
[reloc_index
] = plt
->vma
+ plt_offset
;
5868 plt_offset
+= bed
->plt_entry_size
;
5870 /* PR binutils/18437: Skip extra relocations in the .rela.plt
5872 if (plt_offset
>= plt
->size
)
5876 free (plt_contents
);
5881 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
5885 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
5892 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
5893 as PLT if it exists. */
5894 asection
*plt
= bfd_get_section_by_name (abfd
, ".plt.bnd");
5896 plt
= bfd_get_section_by_name (abfd
, ".plt");
5897 return _bfd_elf_ifunc_get_synthetic_symtab (abfd
, symcount
, syms
,
5898 dynsymcount
, dynsyms
, ret
,
5900 elf_x86_64_get_plt_sym_val
);
5903 /* Handle an x86-64 specific section when reading an object file. This
5904 is called when elfcode.h finds a section with an unknown type. */
5907 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
5908 const char *name
, int shindex
)
5910 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
5913 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
5919 /* Hook called by the linker routine which adds symbols from an object
5920 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5924 elf_x86_64_add_symbol_hook (bfd
*abfd
,
5925 struct bfd_link_info
*info
,
5926 Elf_Internal_Sym
*sym
,
5927 const char **namep ATTRIBUTE_UNUSED
,
5928 flagword
*flagsp ATTRIBUTE_UNUSED
,
5934 switch (sym
->st_shndx
)
5936 case SHN_X86_64_LCOMMON
:
5937 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
5940 lcomm
= bfd_make_section_with_flags (abfd
,
5944 | SEC_LINKER_CREATED
));
5947 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
5950 *valp
= sym
->st_size
;
5954 if (ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
5955 && (abfd
->flags
& DYNAMIC
) == 0
5956 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
5957 elf_tdata (info
->output_bfd
)->has_gnu_symbols
5958 |= elf_gnu_symbol_unique
;
5964 /* Given a BFD section, try to locate the corresponding ELF section
5968 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
5969 asection
*sec
, int *index_return
)
5971 if (sec
== &_bfd_elf_large_com_section
)
5973 *index_return
= SHN_X86_64_LCOMMON
;
5979 /* Process a symbol. */
5982 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
5985 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
5987 switch (elfsym
->internal_elf_sym
.st_shndx
)
5989 case SHN_X86_64_LCOMMON
:
5990 asym
->section
= &_bfd_elf_large_com_section
;
5991 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
5992 /* Common symbol doesn't set BSF_GLOBAL. */
5993 asym
->flags
&= ~BSF_GLOBAL
;
5999 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
6001 return (sym
->st_shndx
== SHN_COMMON
6002 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
6006 elf_x86_64_common_section_index (asection
*sec
)
6008 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6011 return SHN_X86_64_LCOMMON
;
6015 elf_x86_64_common_section (asection
*sec
)
6017 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
6018 return bfd_com_section_ptr
;
6020 return &_bfd_elf_large_com_section
;
6024 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
6025 const Elf_Internal_Sym
*sym
,
6030 const asection
*oldsec
)
6032 /* A normal common symbol and a large common symbol result in a
6033 normal common symbol. We turn the large common symbol into a
6036 && h
->root
.type
== bfd_link_hash_common
6038 && bfd_is_com_section (*psec
)
6041 if (sym
->st_shndx
== SHN_COMMON
6042 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
6044 h
->root
.u
.c
.p
->section
6045 = bfd_make_section_old_way (oldbfd
, "COMMON");
6046 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
6048 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
6049 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
6050 *psec
= bfd_com_section_ptr
;
6057 elf_x86_64_additional_program_headers (bfd
*abfd
,
6058 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
6063 /* Check to see if we need a large readonly segment. */
6064 s
= bfd_get_section_by_name (abfd
, ".lrodata");
6065 if (s
&& (s
->flags
& SEC_LOAD
))
6068 /* Check to see if we need a large data segment. Since .lbss sections
6069 is placed right after the .bss section, there should be no need for
6070 a large data segment just because of .lbss. */
6071 s
= bfd_get_section_by_name (abfd
, ".ldata");
6072 if (s
&& (s
->flags
& SEC_LOAD
))
6078 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6081 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
6083 if (h
->plt
.offset
!= (bfd_vma
) -1
6085 && !h
->pointer_equality_needed
)
6088 return _bfd_elf_hash_symbol (h
);
6091 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6094 elf_x86_64_relocs_compatible (const bfd_target
*input
,
6095 const bfd_target
*output
)
6097 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
6098 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
6099 && _bfd_elf_relocs_compatible (input
, output
));
6102 static const struct bfd_elf_special_section
6103 elf_x86_64_special_sections
[]=
6105 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6106 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6107 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
6108 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6109 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
6110 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
6111 { NULL
, 0, 0, 0, 0 }
6114 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6115 #define TARGET_LITTLE_NAME "elf64-x86-64"
6116 #define ELF_ARCH bfd_arch_i386
6117 #define ELF_TARGET_ID X86_64_ELF_DATA
6118 #define ELF_MACHINE_CODE EM_X86_64
6119 #define ELF_MAXPAGESIZE 0x200000
6120 #define ELF_MINPAGESIZE 0x1000
6121 #define ELF_COMMONPAGESIZE 0x1000
6123 #define elf_backend_can_gc_sections 1
6124 #define elf_backend_can_refcount 1
6125 #define elf_backend_want_got_plt 1
6126 #define elf_backend_plt_readonly 1
6127 #define elf_backend_want_plt_sym 0
6128 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6129 #define elf_backend_rela_normal 1
6130 #define elf_backend_plt_alignment 4
6131 #define elf_backend_extern_protected_data 1
6133 #define elf_info_to_howto elf_x86_64_info_to_howto
6135 #define bfd_elf64_bfd_link_hash_table_create \
6136 elf_x86_64_link_hash_table_create
6137 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6138 #define bfd_elf64_bfd_reloc_name_lookup \
6139 elf_x86_64_reloc_name_lookup
6141 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6142 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6143 #define elf_backend_check_relocs elf_x86_64_check_relocs
6144 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6145 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6146 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6147 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6148 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6149 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6150 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6151 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6153 #define elf_backend_write_core_note elf_x86_64_write_core_note
6155 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6156 #define elf_backend_relocate_section elf_x86_64_relocate_section
6157 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6158 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6159 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6160 #define elf_backend_object_p elf64_x86_64_elf_object_p
6161 #define bfd_elf64_mkobject elf_x86_64_mkobject
6162 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6164 #define elf_backend_section_from_shdr \
6165 elf_x86_64_section_from_shdr
6167 #define elf_backend_section_from_bfd_section \
6168 elf_x86_64_elf_section_from_bfd_section
6169 #define elf_backend_add_symbol_hook \
6170 elf_x86_64_add_symbol_hook
6171 #define elf_backend_symbol_processing \
6172 elf_x86_64_symbol_processing
6173 #define elf_backend_common_section_index \
6174 elf_x86_64_common_section_index
6175 #define elf_backend_common_section \
6176 elf_x86_64_common_section
6177 #define elf_backend_common_definition \
6178 elf_x86_64_common_definition
6179 #define elf_backend_merge_symbol \
6180 elf_x86_64_merge_symbol
6181 #define elf_backend_special_sections \
6182 elf_x86_64_special_sections
6183 #define elf_backend_additional_program_headers \
6184 elf_x86_64_additional_program_headers
6185 #define elf_backend_hash_symbol \
6186 elf_x86_64_hash_symbol
6188 #include "elf64-target.h"
6190 /* CloudABI support. */
6192 #undef TARGET_LITTLE_SYM
6193 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6194 #undef TARGET_LITTLE_NAME
6195 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6198 #define ELF_OSABI ELFOSABI_CLOUDABI
6201 #define elf64_bed elf64_x86_64_cloudabi_bed
6203 #include "elf64-target.h"
6205 /* FreeBSD support. */
6207 #undef TARGET_LITTLE_SYM
6208 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6209 #undef TARGET_LITTLE_NAME
6210 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6213 #define ELF_OSABI ELFOSABI_FREEBSD
6216 #define elf64_bed elf64_x86_64_fbsd_bed
6218 #include "elf64-target.h"
6220 /* Solaris 2 support. */
6222 #undef TARGET_LITTLE_SYM
6223 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6224 #undef TARGET_LITTLE_NAME
6225 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6227 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6228 objects won't be recognized. */
6232 #define elf64_bed elf64_x86_64_sol2_bed
6234 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6236 #undef elf_backend_static_tls_alignment
6237 #define elf_backend_static_tls_alignment 16
6239 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6241 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6243 #undef elf_backend_want_plt_sym
6244 #define elf_backend_want_plt_sym 1
6246 #include "elf64-target.h"
6248 /* Native Client support. */
6251 elf64_x86_64_nacl_elf_object_p (bfd
*abfd
)
6253 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6254 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64_nacl
);
6258 #undef TARGET_LITTLE_SYM
6259 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6260 #undef TARGET_LITTLE_NAME
6261 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6263 #define elf64_bed elf64_x86_64_nacl_bed
6265 #undef ELF_MAXPAGESIZE
6266 #undef ELF_MINPAGESIZE
6267 #undef ELF_COMMONPAGESIZE
6268 #define ELF_MAXPAGESIZE 0x10000
6269 #define ELF_MINPAGESIZE 0x10000
6270 #define ELF_COMMONPAGESIZE 0x10000
6272 /* Restore defaults. */
6274 #undef elf_backend_static_tls_alignment
6275 #undef elf_backend_want_plt_sym
6276 #define elf_backend_want_plt_sym 0
6278 /* NaCl uses substantially different PLT entries for the same effects. */
6280 #undef elf_backend_plt_alignment
6281 #define elf_backend_plt_alignment 5
6282 #define NACL_PLT_ENTRY_SIZE 64
6283 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6285 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
6287 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6288 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6289 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6290 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6291 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6293 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6294 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6296 /* 32 bytes of nop to pad out to the standard size. */
6297 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6298 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6299 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6300 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6301 0x66, /* excess data32 prefix */
6305 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
6307 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6308 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
6309 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6310 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6312 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6313 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6314 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6316 /* Lazy GOT entries point here (32-byte aligned). */
6317 0x68, /* pushq immediate */
6318 0, 0, 0, 0, /* replaced with index into relocation table. */
6319 0xe9, /* jmp relative */
6320 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6322 /* 22 bytes of nop to pad out to the standard size. */
6323 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6324 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6325 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6328 /* .eh_frame covering the .plt section. */
6330 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
6332 #if (PLT_CIE_LENGTH != 20 \
6333 || PLT_FDE_LENGTH != 36 \
6334 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6335 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6336 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6338 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
6339 0, 0, 0, 0, /* CIE ID */
6340 1, /* CIE version */
6341 'z', 'R', 0, /* Augmentation string */
6342 1, /* Code alignment factor */
6343 0x78, /* Data alignment factor */
6344 16, /* Return address column */
6345 1, /* Augmentation size */
6346 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
6347 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6348 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6349 DW_CFA_nop
, DW_CFA_nop
,
6351 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
6352 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
6353 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6354 0, 0, 0, 0, /* .plt size goes here */
6355 0, /* Augmentation size */
6356 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
6357 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6358 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
6359 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6360 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
6361 13, /* Block length */
6362 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
6363 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
6364 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
6365 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
6366 DW_CFA_nop
, DW_CFA_nop
6369 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
6371 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
6372 elf_x86_64_nacl_plt_entry
, /* plt_entry */
6373 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
6374 2, /* plt0_got1_offset */
6375 9, /* plt0_got2_offset */
6376 13, /* plt0_got2_insn_end */
6377 3, /* plt_got_offset */
6378 33, /* plt_reloc_offset */
6379 38, /* plt_plt_offset */
6380 7, /* plt_got_insn_size */
6381 42, /* plt_plt_insn_end */
6382 32, /* plt_lazy_offset */
6383 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
6384 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
6387 #undef elf_backend_arch_data
6388 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6390 #undef elf_backend_object_p
6391 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6392 #undef elf_backend_modify_segment_map
6393 #define elf_backend_modify_segment_map nacl_modify_segment_map
6394 #undef elf_backend_modify_program_headers
6395 #define elf_backend_modify_program_headers nacl_modify_program_headers
6396 #undef elf_backend_final_write_processing
6397 #define elf_backend_final_write_processing nacl_final_write_processing
6399 #include "elf64-target.h"
6401 /* Native Client x32 support. */
6404 elf32_x86_64_nacl_elf_object_p (bfd
*abfd
)
6406 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6407 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32_nacl
);
6411 #undef TARGET_LITTLE_SYM
6412 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6413 #undef TARGET_LITTLE_NAME
6414 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6416 #define elf32_bed elf32_x86_64_nacl_bed
6418 #define bfd_elf32_bfd_link_hash_table_create \
6419 elf_x86_64_link_hash_table_create
6420 #define bfd_elf32_bfd_reloc_type_lookup \
6421 elf_x86_64_reloc_type_lookup
6422 #define bfd_elf32_bfd_reloc_name_lookup \
6423 elf_x86_64_reloc_name_lookup
6424 #define bfd_elf32_mkobject \
6426 #define bfd_elf32_get_synthetic_symtab \
6427 elf_x86_64_get_synthetic_symtab
6429 #undef elf_backend_object_p
6430 #define elf_backend_object_p \
6431 elf32_x86_64_nacl_elf_object_p
6433 #undef elf_backend_bfd_from_remote_memory
6434 #define elf_backend_bfd_from_remote_memory \
6435 _bfd_elf32_bfd_from_remote_memory
6437 #undef elf_backend_size_info
6438 #define elf_backend_size_info \
6439 _bfd_elf32_size_info
6441 #include "elf32-target.h"
6443 /* Restore defaults. */
6444 #undef elf_backend_object_p
6445 #define elf_backend_object_p elf64_x86_64_elf_object_p
6446 #undef elf_backend_bfd_from_remote_memory
6447 #undef elf_backend_size_info
6448 #undef elf_backend_modify_segment_map
6449 #undef elf_backend_modify_program_headers
6450 #undef elf_backend_final_write_processing
6452 /* Intel L1OM support. */
6455 elf64_l1om_elf_object_p (bfd
*abfd
)
6457 /* Set the right machine number for an L1OM elf64 file. */
6458 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
6462 #undef TARGET_LITTLE_SYM
6463 #define TARGET_LITTLE_SYM l1om_elf64_vec
6464 #undef TARGET_LITTLE_NAME
6465 #define TARGET_LITTLE_NAME "elf64-l1om"
6467 #define ELF_ARCH bfd_arch_l1om
6469 #undef ELF_MACHINE_CODE
6470 #define ELF_MACHINE_CODE EM_L1OM
6475 #define elf64_bed elf64_l1om_bed
6477 #undef elf_backend_object_p
6478 #define elf_backend_object_p elf64_l1om_elf_object_p
6480 /* Restore defaults. */
6481 #undef ELF_MAXPAGESIZE
6482 #undef ELF_MINPAGESIZE
6483 #undef ELF_COMMONPAGESIZE
6484 #define ELF_MAXPAGESIZE 0x200000
6485 #define ELF_MINPAGESIZE 0x1000
6486 #define ELF_COMMONPAGESIZE 0x1000
6487 #undef elf_backend_plt_alignment
6488 #define elf_backend_plt_alignment 4
6489 #undef elf_backend_arch_data
6490 #define elf_backend_arch_data &elf_x86_64_arch_bed
6492 #include "elf64-target.h"
6494 /* FreeBSD L1OM support. */
6496 #undef TARGET_LITTLE_SYM
6497 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6498 #undef TARGET_LITTLE_NAME
6499 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6502 #define ELF_OSABI ELFOSABI_FREEBSD
6505 #define elf64_bed elf64_l1om_fbsd_bed
6507 #include "elf64-target.h"
6509 /* Intel K1OM support. */
6512 elf64_k1om_elf_object_p (bfd
*abfd
)
6514 /* Set the right machine number for an K1OM elf64 file. */
6515 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
6519 #undef TARGET_LITTLE_SYM
6520 #define TARGET_LITTLE_SYM k1om_elf64_vec
6521 #undef TARGET_LITTLE_NAME
6522 #define TARGET_LITTLE_NAME "elf64-k1om"
6524 #define ELF_ARCH bfd_arch_k1om
6526 #undef ELF_MACHINE_CODE
6527 #define ELF_MACHINE_CODE EM_K1OM
6532 #define elf64_bed elf64_k1om_bed
6534 #undef elf_backend_object_p
6535 #define elf_backend_object_p elf64_k1om_elf_object_p
6537 #undef elf_backend_static_tls_alignment
6539 #undef elf_backend_want_plt_sym
6540 #define elf_backend_want_plt_sym 0
6542 #include "elf64-target.h"
6544 /* FreeBSD K1OM support. */
6546 #undef TARGET_LITTLE_SYM
6547 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6548 #undef TARGET_LITTLE_NAME
6549 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6552 #define ELF_OSABI ELFOSABI_FREEBSD
6555 #define elf64_bed elf64_k1om_fbsd_bed
6557 #include "elf64-target.h"
6559 /* 32bit x86-64 support. */
6561 #undef TARGET_LITTLE_SYM
6562 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6563 #undef TARGET_LITTLE_NAME
6564 #define TARGET_LITTLE_NAME "elf32-x86-64"
6568 #define ELF_ARCH bfd_arch_i386
6570 #undef ELF_MACHINE_CODE
6571 #define ELF_MACHINE_CODE EM_X86_64
6575 #undef elf_backend_object_p
6576 #define elf_backend_object_p \
6577 elf32_x86_64_elf_object_p
6579 #undef elf_backend_bfd_from_remote_memory
6580 #define elf_backend_bfd_from_remote_memory \
6581 _bfd_elf32_bfd_from_remote_memory
6583 #undef elf_backend_size_info
6584 #define elf_backend_size_info \
6585 _bfd_elf32_size_info
6587 #include "elf32-target.h"