1 /* X86-64 specific support for ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 Free Software Foundation, Inc.
5 Contributed by Jan Hubicka <jh@suse.cz>.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
30 #include "bfd_stdint.h"
34 #include "libiberty.h"
36 #include "elf/x86-64.h"
43 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
44 #define MINUS_ONE (~ (bfd_vma) 0)
46 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
47 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
48 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
49 since they are the same. */
51 #define ABI_64_P(abfd) \
52 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
54 /* The relocation "howto" table. Order of fields:
55 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
56 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
57 static reloc_howto_type x86_64_elf_howto_table
[] =
59 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
60 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
62 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
63 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
65 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
66 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
68 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
69 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
71 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
72 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
74 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
75 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
77 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
78 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
80 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
81 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
83 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
84 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
86 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
87 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
89 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
90 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
92 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
93 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
95 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
96 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
97 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
99 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
100 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
101 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
102 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
103 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
104 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
106 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
107 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
109 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
110 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
112 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
113 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
115 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
116 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
118 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
119 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
121 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
122 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
124 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
125 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
127 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
128 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
130 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
131 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
132 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
133 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
134 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
135 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
136 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
137 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
139 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
140 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
142 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
143 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
144 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
145 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
146 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
148 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
149 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
153 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
154 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
155 "R_X86_64_GOTPC32_TLSDESC",
156 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
157 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
158 complain_overflow_dont
, bfd_elf_generic_reloc
,
159 "R_X86_64_TLSDESC_CALL",
161 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
162 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
164 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
165 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
166 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
168 HOWTO(R_X86_64_RELATIVE64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
169 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE64", FALSE
, MINUS_ONE
,
172 /* We have a gap in the reloc numbers here.
173 R_X86_64_standard counts the number up to this point, and
174 R_X86_64_vt_offset is the value to subtract from a reloc type of
175 R_X86_64_GNU_VT* to form an index into this table. */
176 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
177 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
179 /* GNU extension to record C++ vtable hierarchy. */
180 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
181 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
183 /* GNU extension to record C++ vtable member usage. */
184 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
185 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
188 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
189 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
190 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
194 #define IS_X86_64_PCREL_TYPE(TYPE) \
195 ( ((TYPE) == R_X86_64_PC8) \
196 || ((TYPE) == R_X86_64_PC16) \
197 || ((TYPE) == R_X86_64_PC32) \
198 || ((TYPE) == R_X86_64_PC64))
200 /* Map BFD relocs to the x86_64 elf relocs. */
203 bfd_reloc_code_real_type bfd_reloc_val
;
204 unsigned char elf_reloc_val
;
207 static const struct elf_reloc_map x86_64_reloc_map
[] =
209 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
210 { BFD_RELOC_64
, R_X86_64_64
, },
211 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
212 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
213 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
214 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
215 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
216 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
217 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
218 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
219 { BFD_RELOC_32
, R_X86_64_32
, },
220 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
221 { BFD_RELOC_16
, R_X86_64_16
, },
222 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
223 { BFD_RELOC_8
, R_X86_64_8
, },
224 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
225 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
226 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
227 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
228 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
229 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
230 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
231 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
232 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
233 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
234 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
235 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
236 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
237 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
238 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
239 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
240 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
241 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
242 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
243 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
244 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
245 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
246 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
249 static reloc_howto_type
*
250 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
254 if (r_type
== (unsigned int) R_X86_64_32
)
259 i
= ARRAY_SIZE (x86_64_elf_howto_table
) - 1;
261 else if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
262 || r_type
>= (unsigned int) R_X86_64_max
)
264 if (r_type
>= (unsigned int) R_X86_64_standard
)
266 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
268 r_type
= R_X86_64_NONE
;
273 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
274 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
275 return &x86_64_elf_howto_table
[i
];
278 /* Given a BFD reloc type, return a HOWTO structure. */
279 static reloc_howto_type
*
280 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
281 bfd_reloc_code_real_type code
)
285 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
288 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
289 return elf_x86_64_rtype_to_howto (abfd
,
290 x86_64_reloc_map
[i
].elf_reloc_val
);
295 static reloc_howto_type
*
296 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
301 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
303 /* Get x32 R_X86_64_32. */
304 reloc_howto_type
*reloc
305 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
306 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
310 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
311 if (x86_64_elf_howto_table
[i
].name
!= NULL
312 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
313 return &x86_64_elf_howto_table
[i
];
318 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
321 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
322 Elf_Internal_Rela
*dst
)
326 r_type
= ELF32_R_TYPE (dst
->r_info
);
327 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
328 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
331 /* Support for core dump NOTE sections. */
333 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
338 switch (note
->descsz
)
343 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
345 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
348 elf_tdata (abfd
)->core_lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
356 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
358 elf_tdata (abfd
)->core_signal
359 = bfd_get_16 (abfd
, note
->descdata
+ 12);
362 elf_tdata (abfd
)->core_lwpid
363 = bfd_get_32 (abfd
, note
->descdata
+ 32);
372 /* Make a ".reg/999" section. */
373 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
374 size
, note
->descpos
+ offset
);
378 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
380 switch (note
->descsz
)
385 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
386 elf_tdata (abfd
)->core_pid
387 = bfd_get_32 (abfd
, note
->descdata
+ 12);
388 elf_tdata (abfd
)->core_program
389 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
390 elf_tdata (abfd
)->core_command
391 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
394 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
395 elf_tdata (abfd
)->core_pid
396 = bfd_get_32 (abfd
, note
->descdata
+ 24);
397 elf_tdata (abfd
)->core_program
398 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
399 elf_tdata (abfd
)->core_command
400 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
403 /* Note that for some reason, a spurious space is tacked
404 onto the end of the args in some (at least one anyway)
405 implementations, so strip it off if it exists. */
408 char *command
= elf_tdata (abfd
)->core_command
;
409 int n
= strlen (command
);
411 if (0 < n
&& command
[n
- 1] == ' ')
412 command
[n
- 1] = '\0';
420 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
423 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
425 const char *fname
, *psargs
;
436 va_start (ap
, note_type
);
437 fname
= va_arg (ap
, const char *);
438 psargs
= va_arg (ap
, const char *);
441 if (bed
->s
->elfclass
== ELFCLASS32
)
444 memset (&data
, 0, sizeof (data
));
445 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
446 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
447 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
448 &data
, sizeof (data
));
453 memset (&data
, 0, sizeof (data
));
454 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
455 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
456 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
457 &data
, sizeof (data
));
462 va_start (ap
, note_type
);
463 pid
= va_arg (ap
, long);
464 cursig
= va_arg (ap
, int);
465 gregs
= va_arg (ap
, const void *);
468 if (bed
->s
->elfclass
== ELFCLASS32
)
470 if (bed
->elf_machine_code
== EM_X86_64
)
472 prstatusx32_t prstat
;
473 memset (&prstat
, 0, sizeof (prstat
));
475 prstat
.pr_cursig
= cursig
;
476 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
477 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
478 &prstat
, sizeof (prstat
));
483 memset (&prstat
, 0, sizeof (prstat
));
485 prstat
.pr_cursig
= cursig
;
486 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
487 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
488 &prstat
, sizeof (prstat
));
494 memset (&prstat
, 0, sizeof (prstat
));
496 prstat
.pr_cursig
= cursig
;
497 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
498 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
499 &prstat
, sizeof (prstat
));
506 /* Functions for the x86-64 ELF linker. */
508 /* The name of the dynamic interpreter. This is put in the .interp
511 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
512 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
514 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
515 copying dynamic variables from a shared lib into an app's dynbss
516 section, and instead use a dynamic relocation to point into the
518 #define ELIMINATE_COPY_RELOCS 1
520 /* The size in bytes of an entry in the global offset table. */
522 #define GOT_ENTRY_SIZE 8
524 /* The size in bytes of an entry in the procedure linkage table. */
526 #define PLT_ENTRY_SIZE 16
528 /* The first entry in a procedure linkage table looks like this. See the
529 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
531 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
533 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
534 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
535 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
538 /* Subsequent entries in a procedure linkage table look like this. */
540 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
542 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
543 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
544 0x68, /* pushq immediate */
545 0, 0, 0, 0, /* replaced with index into relocation table. */
546 0xe9, /* jmp relative */
547 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
550 /* .eh_frame covering the .plt section. */
552 static const bfd_byte elf_x86_64_eh_frame_plt
[] =
554 #define PLT_CIE_LENGTH 20
555 #define PLT_FDE_LENGTH 36
556 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
557 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
558 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
559 0, 0, 0, 0, /* CIE ID */
561 'z', 'R', 0, /* Augmentation string */
562 1, /* Code alignment factor */
563 0x78, /* Data alignment factor */
564 16, /* Return address column */
565 1, /* Augmentation size */
566 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
567 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
568 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
569 DW_CFA_nop
, DW_CFA_nop
,
571 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
572 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
573 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
574 0, 0, 0, 0, /* .plt size goes here */
575 0, /* Augmentation size */
576 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
577 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
578 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
579 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
580 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
581 11, /* Block length */
582 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
583 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
584 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
585 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
586 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
589 /* Architecture-specific backend data for x86-64. */
591 struct elf_x86_64_backend_data
593 /* Templates for the initial PLT entry and for subsequent entries. */
594 const bfd_byte
*plt0_entry
;
595 const bfd_byte
*plt_entry
;
596 unsigned int plt_entry_size
; /* Size of each PLT entry. */
598 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
599 unsigned int plt0_got1_offset
;
600 unsigned int plt0_got2_offset
;
602 /* Offset of the end of the PC-relative instruction containing
604 unsigned int plt0_got2_insn_end
;
606 /* Offsets into plt_entry that are to be replaced with... */
607 unsigned int plt_got_offset
; /* ... address of this symbol in .got. */
608 unsigned int plt_reloc_offset
; /* ... offset into relocation table. */
609 unsigned int plt_plt_offset
; /* ... offset to start of .plt. */
611 /* Length of the PC-relative instruction containing plt_got_offset. */
612 unsigned int plt_got_insn_size
;
614 /* Offset of the end of the PC-relative jump to plt0_entry. */
615 unsigned int plt_plt_insn_end
;
617 /* Offset into plt_entry where the initial value of the GOT entry points. */
618 unsigned int plt_lazy_offset
;
620 /* .eh_frame covering the .plt section. */
621 const bfd_byte
*eh_frame_plt
;
622 unsigned int eh_frame_plt_size
;
625 #define get_elf_x86_64_backend_data(abfd) \
626 ((const struct elf_x86_64_backend_data *) \
627 get_elf_backend_data (abfd)->arch_data)
629 #define GET_PLT_ENTRY_SIZE(abfd) \
630 get_elf_x86_64_backend_data (abfd)->plt_entry_size
632 /* These are the standard parameters. */
633 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed
=
635 elf_x86_64_plt0_entry
, /* plt0_entry */
636 elf_x86_64_plt_entry
, /* plt_entry */
637 sizeof (elf_x86_64_plt_entry
), /* plt_entry_size */
638 2, /* plt0_got1_offset */
639 8, /* plt0_got2_offset */
640 12, /* plt0_got2_insn_end */
641 2, /* plt_got_offset */
642 7, /* plt_reloc_offset */
643 12, /* plt_plt_offset */
644 6, /* plt_got_insn_size */
645 PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
646 6, /* plt_lazy_offset */
647 elf_x86_64_eh_frame_plt
, /* eh_frame_plt */
648 sizeof (elf_x86_64_eh_frame_plt
), /* eh_frame_plt_size */
651 #define elf_backend_arch_data &elf_x86_64_arch_bed
653 /* x86-64 ELF linker hash entry. */
655 struct elf_x86_64_link_hash_entry
657 struct elf_link_hash_entry elf
;
659 /* Track dynamic relocs copied for this symbol. */
660 struct elf_dyn_relocs
*dyn_relocs
;
662 #define GOT_UNKNOWN 0
666 #define GOT_TLS_GDESC 4
667 #define GOT_TLS_GD_BOTH_P(type) \
668 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
669 #define GOT_TLS_GD_P(type) \
670 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
671 #define GOT_TLS_GDESC_P(type) \
672 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
673 #define GOT_TLS_GD_ANY_P(type) \
674 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
675 unsigned char tls_type
;
677 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
678 starting at the end of the jump table. */
682 #define elf_x86_64_hash_entry(ent) \
683 ((struct elf_x86_64_link_hash_entry *)(ent))
685 struct elf_x86_64_obj_tdata
687 struct elf_obj_tdata root
;
689 /* tls_type for each local got entry. */
690 char *local_got_tls_type
;
692 /* GOTPLT entries for TLS descriptors. */
693 bfd_vma
*local_tlsdesc_gotent
;
696 #define elf_x86_64_tdata(abfd) \
697 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
699 #define elf_x86_64_local_got_tls_type(abfd) \
700 (elf_x86_64_tdata (abfd)->local_got_tls_type)
702 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
703 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
705 #define is_x86_64_elf(bfd) \
706 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
707 && elf_tdata (bfd) != NULL \
708 && elf_object_id (bfd) == X86_64_ELF_DATA)
711 elf_x86_64_mkobject (bfd
*abfd
)
713 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
717 /* x86-64 ELF linker hash table. */
719 struct elf_x86_64_link_hash_table
721 struct elf_link_hash_table elf
;
723 /* Short-cuts to get to dynamic linker sections. */
726 asection
*plt_eh_frame
;
730 bfd_signed_vma refcount
;
734 /* The amount of space used by the jump slots in the GOT. */
735 bfd_vma sgotplt_jump_table_size
;
737 /* Small local sym cache. */
738 struct sym_cache sym_cache
;
740 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
741 bfd_vma (*r_sym
) (bfd_vma
);
742 unsigned int pointer_r_type
;
743 const char *dynamic_interpreter
;
744 int dynamic_interpreter_size
;
746 /* _TLS_MODULE_BASE_ symbol. */
747 struct bfd_link_hash_entry
*tls_module_base
;
749 /* Used by local STT_GNU_IFUNC symbols. */
750 htab_t loc_hash_table
;
751 void * loc_hash_memory
;
753 /* The offset into splt of the PLT entry for the TLS descriptor
754 resolver. Special values are 0, if not necessary (or not found
755 to be necessary yet), and -1 if needed but not determined
758 /* The offset into sgot of the GOT entry used by the PLT entry
762 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
763 bfd_vma next_jump_slot_index
;
764 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
765 bfd_vma next_irelative_index
;
768 /* Get the x86-64 ELF linker hash table from a link_info structure. */
770 #define elf_x86_64_hash_table(p) \
771 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
772 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
774 #define elf_x86_64_compute_jump_table_size(htab) \
775 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
777 /* Create an entry in an x86-64 ELF linker hash table. */
779 static struct bfd_hash_entry
*
780 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
781 struct bfd_hash_table
*table
,
784 /* Allocate the structure if it has not already been allocated by a
788 entry
= (struct bfd_hash_entry
*)
789 bfd_hash_allocate (table
,
790 sizeof (struct elf_x86_64_link_hash_entry
));
795 /* Call the allocation method of the superclass. */
796 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
799 struct elf_x86_64_link_hash_entry
*eh
;
801 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
802 eh
->dyn_relocs
= NULL
;
803 eh
->tls_type
= GOT_UNKNOWN
;
804 eh
->tlsdesc_got
= (bfd_vma
) -1;
810 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
811 for local symbol so that we can handle local STT_GNU_IFUNC symbols
812 as global symbol. We reuse indx and dynstr_index for local symbol
813 hash since they aren't used by global symbols in this backend. */
816 elf_x86_64_local_htab_hash (const void *ptr
)
818 struct elf_link_hash_entry
*h
819 = (struct elf_link_hash_entry
*) ptr
;
820 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
823 /* Compare local hash entries. */
826 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
828 struct elf_link_hash_entry
*h1
829 = (struct elf_link_hash_entry
*) ptr1
;
830 struct elf_link_hash_entry
*h2
831 = (struct elf_link_hash_entry
*) ptr2
;
833 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
836 /* Find and/or create a hash entry for local symbol. */
838 static struct elf_link_hash_entry
*
839 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
840 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
843 struct elf_x86_64_link_hash_entry e
, *ret
;
844 asection
*sec
= abfd
->sections
;
845 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
846 htab
->r_sym (rel
->r_info
));
849 e
.elf
.indx
= sec
->id
;
850 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
851 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
852 create
? INSERT
: NO_INSERT
);
859 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
863 ret
= (struct elf_x86_64_link_hash_entry
*)
864 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
865 sizeof (struct elf_x86_64_link_hash_entry
));
868 memset (ret
, 0, sizeof (*ret
));
869 ret
->elf
.indx
= sec
->id
;
870 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
871 ret
->elf
.dynindx
= -1;
877 /* Create an X86-64 ELF linker hash table. */
879 static struct bfd_link_hash_table
*
880 elf_x86_64_link_hash_table_create (bfd
*abfd
)
882 struct elf_x86_64_link_hash_table
*ret
;
883 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
885 ret
= (struct elf_x86_64_link_hash_table
*) bfd_malloc (amt
);
889 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
890 elf_x86_64_link_hash_newfunc
,
891 sizeof (struct elf_x86_64_link_hash_entry
),
900 ret
->plt_eh_frame
= NULL
;
901 ret
->sym_cache
.abfd
= NULL
;
902 ret
->tlsdesc_plt
= 0;
903 ret
->tlsdesc_got
= 0;
904 ret
->tls_ld_got
.refcount
= 0;
905 ret
->sgotplt_jump_table_size
= 0;
906 ret
->tls_module_base
= NULL
;
907 ret
->next_jump_slot_index
= 0;
908 ret
->next_irelative_index
= 0;
912 ret
->r_info
= elf64_r_info
;
913 ret
->r_sym
= elf64_r_sym
;
914 ret
->pointer_r_type
= R_X86_64_64
;
915 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
916 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
920 ret
->r_info
= elf32_r_info
;
921 ret
->r_sym
= elf32_r_sym
;
922 ret
->pointer_r_type
= R_X86_64_32
;
923 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
924 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
927 ret
->loc_hash_table
= htab_try_create (1024,
928 elf_x86_64_local_htab_hash
,
929 elf_x86_64_local_htab_eq
,
931 ret
->loc_hash_memory
= objalloc_create ();
932 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
938 return &ret
->elf
.root
;
941 /* Destroy an X86-64 ELF linker hash table. */
944 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table
*hash
)
946 struct elf_x86_64_link_hash_table
*htab
947 = (struct elf_x86_64_link_hash_table
*) hash
;
949 if (htab
->loc_hash_table
)
950 htab_delete (htab
->loc_hash_table
);
951 if (htab
->loc_hash_memory
)
952 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
953 _bfd_generic_link_hash_table_free (hash
);
956 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
957 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
961 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
962 struct bfd_link_info
*info
)
964 struct elf_x86_64_link_hash_table
*htab
;
966 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
969 htab
= elf_x86_64_hash_table (info
);
973 htab
->sdynbss
= bfd_get_linker_section (dynobj
, ".dynbss");
975 htab
->srelbss
= bfd_get_linker_section (dynobj
, ".rela.bss");
978 || (!info
->shared
&& !htab
->srelbss
))
981 if (!info
->no_ld_generated_unwind_info
982 && htab
->plt_eh_frame
== NULL
983 && htab
->elf
.splt
!= NULL
)
985 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
986 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
987 | SEC_LINKER_CREATED
);
989 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame", flags
);
990 if (htab
->plt_eh_frame
== NULL
991 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
997 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1000 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1001 struct elf_link_hash_entry
*dir
,
1002 struct elf_link_hash_entry
*ind
)
1004 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1006 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1007 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1009 if (eind
->dyn_relocs
!= NULL
)
1011 if (edir
->dyn_relocs
!= NULL
)
1013 struct elf_dyn_relocs
**pp
;
1014 struct elf_dyn_relocs
*p
;
1016 /* Add reloc counts against the indirect sym to the direct sym
1017 list. Merge any entries against the same section. */
1018 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1020 struct elf_dyn_relocs
*q
;
1022 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1023 if (q
->sec
== p
->sec
)
1025 q
->pc_count
+= p
->pc_count
;
1026 q
->count
+= p
->count
;
1033 *pp
= edir
->dyn_relocs
;
1036 edir
->dyn_relocs
= eind
->dyn_relocs
;
1037 eind
->dyn_relocs
= NULL
;
1040 if (ind
->root
.type
== bfd_link_hash_indirect
1041 && dir
->got
.refcount
<= 0)
1043 edir
->tls_type
= eind
->tls_type
;
1044 eind
->tls_type
= GOT_UNKNOWN
;
1047 if (ELIMINATE_COPY_RELOCS
1048 && ind
->root
.type
!= bfd_link_hash_indirect
1049 && dir
->dynamic_adjusted
)
1051 /* If called to transfer flags for a weakdef during processing
1052 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1053 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1054 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1055 dir
->ref_regular
|= ind
->ref_regular
;
1056 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1057 dir
->needs_plt
|= ind
->needs_plt
;
1058 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1061 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1065 elf64_x86_64_elf_object_p (bfd
*abfd
)
1067 /* Set the right machine number for an x86-64 elf64 file. */
1068 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1073 elf32_x86_64_elf_object_p (bfd
*abfd
)
1075 /* Set the right machine number for an x86-64 elf32 file. */
1076 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1080 /* Return TRUE if the TLS access code sequence support transition
1084 elf_x86_64_check_tls_transition (bfd
*abfd
,
1085 struct bfd_link_info
*info
,
1088 Elf_Internal_Shdr
*symtab_hdr
,
1089 struct elf_link_hash_entry
**sym_hashes
,
1090 unsigned int r_type
,
1091 const Elf_Internal_Rela
*rel
,
1092 const Elf_Internal_Rela
*relend
)
1095 unsigned long r_symndx
;
1096 struct elf_link_hash_entry
*h
;
1098 struct elf_x86_64_link_hash_table
*htab
;
1100 /* Get the section contents. */
1101 if (contents
== NULL
)
1103 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1104 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1107 /* FIXME: How to better handle error condition? */
1108 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1111 /* Cache the section contents for elf_link_input_bfd. */
1112 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1116 htab
= elf_x86_64_hash_table (info
);
1117 offset
= rel
->r_offset
;
1120 case R_X86_64_TLSGD
:
1121 case R_X86_64_TLSLD
:
1122 if ((rel
+ 1) >= relend
)
1125 if (r_type
== R_X86_64_TLSGD
)
1127 /* Check transition from GD access model. For 64bit, only
1128 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1129 .word 0x6666; rex64; call __tls_get_addr
1130 can transit to different access model. For 32bit, only
1131 leaq foo@tlsgd(%rip), %rdi
1132 .word 0x6666; rex64; call __tls_get_addr
1133 can transit to different access model. */
1135 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1136 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1138 if ((offset
+ 12) > sec
->size
1139 || memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1142 if (ABI_64_P (abfd
))
1145 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1151 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1157 /* Check transition from LD access model. Only
1158 leaq foo@tlsld(%rip), %rdi;
1160 can transit to different access model. */
1162 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1164 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1167 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0
1168 || 0xe8 != *(contents
+ offset
+ 4))
1172 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1173 if (r_symndx
< symtab_hdr
->sh_info
)
1176 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1177 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1178 may be versioned. */
1180 && h
->root
.root
.string
!= NULL
1181 && (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1182 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
1183 && (strncmp (h
->root
.root
.string
,
1184 "__tls_get_addr", 14) == 0));
1186 case R_X86_64_GOTTPOFF
:
1187 /* Check transition from IE access model:
1188 mov foo@gottpoff(%rip), %reg
1189 add foo@gottpoff(%rip), %reg
1192 /* Check REX prefix first. */
1193 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1195 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1196 if (val
!= 0x48 && val
!= 0x4c)
1198 /* X32 may have 0x44 REX prefix or no REX prefix. */
1199 if (ABI_64_P (abfd
))
1205 /* X32 may not have any REX prefix. */
1206 if (ABI_64_P (abfd
))
1208 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1212 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1213 if (val
!= 0x8b && val
!= 0x03)
1216 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1217 return (val
& 0xc7) == 5;
1219 case R_X86_64_GOTPC32_TLSDESC
:
1220 /* Check transition from GDesc access model:
1221 leaq x@tlsdesc(%rip), %rax
1223 Make sure it's a leaq adding rip to a 32-bit offset
1224 into any register, although it's probably almost always
1227 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1230 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1231 if ((val
& 0xfb) != 0x48)
1234 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1237 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1238 return (val
& 0xc7) == 0x05;
1240 case R_X86_64_TLSDESC_CALL
:
1241 /* Check transition from GDesc access model:
1242 call *x@tlsdesc(%rax)
1244 if (offset
+ 2 <= sec
->size
)
1246 /* Make sure that it's a call *x@tlsdesc(%rax). */
1247 static const unsigned char call
[] = { 0xff, 0x10 };
1248 return memcmp (contents
+ offset
, call
, 2) == 0;
1258 /* Return TRUE if the TLS access transition is OK or no transition
1259 will be performed. Update R_TYPE if there is a transition. */
1262 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1263 asection
*sec
, bfd_byte
*contents
,
1264 Elf_Internal_Shdr
*symtab_hdr
,
1265 struct elf_link_hash_entry
**sym_hashes
,
1266 unsigned int *r_type
, int tls_type
,
1267 const Elf_Internal_Rela
*rel
,
1268 const Elf_Internal_Rela
*relend
,
1269 struct elf_link_hash_entry
*h
,
1270 unsigned long r_symndx
)
1272 unsigned int from_type
= *r_type
;
1273 unsigned int to_type
= from_type
;
1274 bfd_boolean check
= TRUE
;
1276 /* Skip TLS transition for functions. */
1278 && (h
->type
== STT_FUNC
1279 || h
->type
== STT_GNU_IFUNC
))
1284 case R_X86_64_TLSGD
:
1285 case R_X86_64_GOTPC32_TLSDESC
:
1286 case R_X86_64_TLSDESC_CALL
:
1287 case R_X86_64_GOTTPOFF
:
1288 if (info
->executable
)
1291 to_type
= R_X86_64_TPOFF32
;
1293 to_type
= R_X86_64_GOTTPOFF
;
1296 /* When we are called from elf_x86_64_relocate_section,
1297 CONTENTS isn't NULL and there may be additional transitions
1298 based on TLS_TYPE. */
1299 if (contents
!= NULL
)
1301 unsigned int new_to_type
= to_type
;
1303 if (info
->executable
1306 && tls_type
== GOT_TLS_IE
)
1307 new_to_type
= R_X86_64_TPOFF32
;
1309 if (to_type
== R_X86_64_TLSGD
1310 || to_type
== R_X86_64_GOTPC32_TLSDESC
1311 || to_type
== R_X86_64_TLSDESC_CALL
)
1313 if (tls_type
== GOT_TLS_IE
)
1314 new_to_type
= R_X86_64_GOTTPOFF
;
1317 /* We checked the transition before when we were called from
1318 elf_x86_64_check_relocs. We only want to check the new
1319 transition which hasn't been checked before. */
1320 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1321 to_type
= new_to_type
;
1326 case R_X86_64_TLSLD
:
1327 if (info
->executable
)
1328 to_type
= R_X86_64_TPOFF32
;
1335 /* Return TRUE if there is no transition. */
1336 if (from_type
== to_type
)
1339 /* Check if the transition can be performed. */
1341 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1342 symtab_hdr
, sym_hashes
,
1343 from_type
, rel
, relend
))
1345 reloc_howto_type
*from
, *to
;
1348 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1349 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1352 name
= h
->root
.root
.string
;
1355 struct elf_x86_64_link_hash_table
*htab
;
1357 htab
= elf_x86_64_hash_table (info
);
1362 Elf_Internal_Sym
*isym
;
1364 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1366 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1370 (*_bfd_error_handler
)
1371 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1372 "in section `%A' failed"),
1373 abfd
, sec
, from
->name
, to
->name
, name
,
1374 (unsigned long) rel
->r_offset
);
1375 bfd_set_error (bfd_error_bad_value
);
1383 /* Look through the relocs for a section during the first phase, and
1384 calculate needed space in the global offset table, procedure
1385 linkage table, and dynamic reloc sections. */
1388 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1390 const Elf_Internal_Rela
*relocs
)
1392 struct elf_x86_64_link_hash_table
*htab
;
1393 Elf_Internal_Shdr
*symtab_hdr
;
1394 struct elf_link_hash_entry
**sym_hashes
;
1395 const Elf_Internal_Rela
*rel
;
1396 const Elf_Internal_Rela
*rel_end
;
1399 if (info
->relocatable
)
1402 BFD_ASSERT (is_x86_64_elf (abfd
));
1404 htab
= elf_x86_64_hash_table (info
);
1408 symtab_hdr
= &elf_symtab_hdr (abfd
);
1409 sym_hashes
= elf_sym_hashes (abfd
);
1413 rel_end
= relocs
+ sec
->reloc_count
;
1414 for (rel
= relocs
; rel
< rel_end
; rel
++)
1416 unsigned int r_type
;
1417 unsigned long r_symndx
;
1418 struct elf_link_hash_entry
*h
;
1419 Elf_Internal_Sym
*isym
;
1422 r_symndx
= htab
->r_sym (rel
->r_info
);
1423 r_type
= ELF32_R_TYPE (rel
->r_info
);
1425 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1427 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1432 if (r_symndx
< symtab_hdr
->sh_info
)
1434 /* A local symbol. */
1435 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1440 /* Check relocation against local STT_GNU_IFUNC symbol. */
1441 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1443 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1448 /* Fake a STT_GNU_IFUNC symbol. */
1449 h
->type
= STT_GNU_IFUNC
;
1452 h
->forced_local
= 1;
1453 h
->root
.type
= bfd_link_hash_defined
;
1461 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1462 while (h
->root
.type
== bfd_link_hash_indirect
1463 || h
->root
.type
== bfd_link_hash_warning
)
1464 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1467 /* Check invalid x32 relocations. */
1468 if (!ABI_64_P (abfd
))
1474 case R_X86_64_DTPOFF64
:
1475 case R_X86_64_TPOFF64
:
1477 case R_X86_64_GOTOFF64
:
1478 case R_X86_64_GOT64
:
1479 case R_X86_64_GOTPCREL64
:
1480 case R_X86_64_GOTPC64
:
1481 case R_X86_64_GOTPLT64
:
1482 case R_X86_64_PLTOFF64
:
1485 name
= h
->root
.root
.string
;
1487 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1489 (*_bfd_error_handler
)
1490 (_("%B: relocation %s against symbol `%s' isn't "
1491 "supported in x32 mode"), abfd
,
1492 x86_64_elf_howto_table
[r_type
].name
, name
);
1493 bfd_set_error (bfd_error_bad_value
);
1501 /* Create the ifunc sections for static executables. If we
1502 never see an indirect function symbol nor we are building
1503 a static executable, those sections will be empty and
1504 won't appear in output. */
1515 case R_X86_64_PLT32
:
1516 case R_X86_64_GOTPCREL
:
1517 case R_X86_64_GOTPCREL64
:
1518 if (htab
->elf
.dynobj
== NULL
)
1519 htab
->elf
.dynobj
= abfd
;
1520 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1525 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1526 it here if it is defined in a non-shared object. */
1527 if (h
->type
== STT_GNU_IFUNC
1530 /* It is referenced by a non-shared object. */
1534 /* STT_GNU_IFUNC symbol must go through PLT. */
1535 h
->plt
.refcount
+= 1;
1537 /* STT_GNU_IFUNC needs dynamic sections. */
1538 if (htab
->elf
.dynobj
== NULL
)
1539 htab
->elf
.dynobj
= abfd
;
1544 if (h
->root
.root
.string
)
1545 name
= h
->root
.root
.string
;
1547 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1549 (*_bfd_error_handler
)
1550 (_("%B: relocation %s against STT_GNU_IFUNC "
1551 "symbol `%s' isn't handled by %s"), abfd
,
1552 x86_64_elf_howto_table
[r_type
].name
,
1553 name
, __FUNCTION__
);
1554 bfd_set_error (bfd_error_bad_value
);
1558 if (ABI_64_P (abfd
))
1562 h
->pointer_equality_needed
= 1;
1565 /* We must copy these reloc types into the output
1566 file. Create a reloc section in dynobj and
1567 make room for this reloc. */
1568 sreloc
= _bfd_elf_create_ifunc_dyn_reloc
1569 (abfd
, info
, sec
, sreloc
,
1570 &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
);
1581 if (r_type
!= R_X86_64_PC32
1582 && r_type
!= R_X86_64_PC64
)
1583 h
->pointer_equality_needed
= 1;
1586 case R_X86_64_PLT32
:
1589 case R_X86_64_GOTPCREL
:
1590 case R_X86_64_GOTPCREL64
:
1591 h
->got
.refcount
+= 1;
1592 if (htab
->elf
.sgot
== NULL
1593 && !_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1603 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1604 symtab_hdr
, sym_hashes
,
1605 &r_type
, GOT_UNKNOWN
,
1606 rel
, rel_end
, h
, r_symndx
))
1611 case R_X86_64_TLSLD
:
1612 htab
->tls_ld_got
.refcount
+= 1;
1615 case R_X86_64_TPOFF32
:
1616 if (!info
->executable
&& ABI_64_P (abfd
))
1619 name
= h
->root
.root
.string
;
1621 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1623 (*_bfd_error_handler
)
1624 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1626 x86_64_elf_howto_table
[r_type
].name
, name
);
1627 bfd_set_error (bfd_error_bad_value
);
1632 case R_X86_64_GOTTPOFF
:
1633 if (!info
->executable
)
1634 info
->flags
|= DF_STATIC_TLS
;
1637 case R_X86_64_GOT32
:
1638 case R_X86_64_GOTPCREL
:
1639 case R_X86_64_TLSGD
:
1640 case R_X86_64_GOT64
:
1641 case R_X86_64_GOTPCREL64
:
1642 case R_X86_64_GOTPLT64
:
1643 case R_X86_64_GOTPC32_TLSDESC
:
1644 case R_X86_64_TLSDESC_CALL
:
1645 /* This symbol requires a global offset table entry. */
1647 int tls_type
, old_tls_type
;
1651 default: tls_type
= GOT_NORMAL
; break;
1652 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1653 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1654 case R_X86_64_GOTPC32_TLSDESC
:
1655 case R_X86_64_TLSDESC_CALL
:
1656 tls_type
= GOT_TLS_GDESC
; break;
1661 if (r_type
== R_X86_64_GOTPLT64
)
1663 /* This relocation indicates that we also need
1664 a PLT entry, as this is a function. We don't need
1665 a PLT entry for local symbols. */
1667 h
->plt
.refcount
+= 1;
1669 h
->got
.refcount
+= 1;
1670 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1674 bfd_signed_vma
*local_got_refcounts
;
1676 /* This is a global offset table entry for a local symbol. */
1677 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1678 if (local_got_refcounts
== NULL
)
1682 size
= symtab_hdr
->sh_info
;
1683 size
*= sizeof (bfd_signed_vma
)
1684 + sizeof (bfd_vma
) + sizeof (char);
1685 local_got_refcounts
= ((bfd_signed_vma
*)
1686 bfd_zalloc (abfd
, size
));
1687 if (local_got_refcounts
== NULL
)
1689 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1690 elf_x86_64_local_tlsdesc_gotent (abfd
)
1691 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1692 elf_x86_64_local_got_tls_type (abfd
)
1693 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1695 local_got_refcounts
[r_symndx
] += 1;
1697 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1700 /* If a TLS symbol is accessed using IE at least once,
1701 there is no point to use dynamic model for it. */
1702 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1703 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1704 || tls_type
!= GOT_TLS_IE
))
1706 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1707 tls_type
= old_tls_type
;
1708 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1709 && GOT_TLS_GD_ANY_P (tls_type
))
1710 tls_type
|= old_tls_type
;
1714 name
= h
->root
.root
.string
;
1716 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1718 (*_bfd_error_handler
)
1719 (_("%B: '%s' accessed both as normal and thread local symbol"),
1725 if (old_tls_type
!= tls_type
)
1728 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1730 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1735 case R_X86_64_GOTOFF64
:
1736 case R_X86_64_GOTPC32
:
1737 case R_X86_64_GOTPC64
:
1739 if (htab
->elf
.sgot
== NULL
)
1741 if (htab
->elf
.dynobj
== NULL
)
1742 htab
->elf
.dynobj
= abfd
;
1743 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1749 case R_X86_64_PLT32
:
1750 /* This symbol requires a procedure linkage table entry. We
1751 actually build the entry in adjust_dynamic_symbol,
1752 because this might be a case of linking PIC code which is
1753 never referenced by a dynamic object, in which case we
1754 don't need to generate a procedure linkage table entry
1757 /* If this is a local symbol, we resolve it directly without
1758 creating a procedure linkage table entry. */
1763 h
->plt
.refcount
+= 1;
1766 case R_X86_64_PLTOFF64
:
1767 /* This tries to form the 'address' of a function relative
1768 to GOT. For global symbols we need a PLT entry. */
1772 h
->plt
.refcount
+= 1;
1777 if (!ABI_64_P (abfd
))
1782 /* Let's help debug shared library creation. These relocs
1783 cannot be used in shared libs. Don't error out for
1784 sections we don't care about, such as debug sections or
1785 non-constant sections. */
1787 && (sec
->flags
& SEC_ALLOC
) != 0
1788 && (sec
->flags
& SEC_READONLY
) != 0)
1791 name
= h
->root
.root
.string
;
1793 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1794 (*_bfd_error_handler
)
1795 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1796 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1797 bfd_set_error (bfd_error_bad_value
);
1808 if (h
!= NULL
&& info
->executable
)
1810 /* If this reloc is in a read-only section, we might
1811 need a copy reloc. We can't check reliably at this
1812 stage whether the section is read-only, as input
1813 sections have not yet been mapped to output sections.
1814 Tentatively set the flag for now, and correct in
1815 adjust_dynamic_symbol. */
1818 /* We may need a .plt entry if the function this reloc
1819 refers to is in a shared lib. */
1820 h
->plt
.refcount
+= 1;
1821 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1822 h
->pointer_equality_needed
= 1;
1825 /* If we are creating a shared library, and this is a reloc
1826 against a global symbol, or a non PC relative reloc
1827 against a local symbol, then we need to copy the reloc
1828 into the shared library. However, if we are linking with
1829 -Bsymbolic, we do not need to copy a reloc against a
1830 global symbol which is defined in an object we are
1831 including in the link (i.e., DEF_REGULAR is set). At
1832 this point we have not seen all the input files, so it is
1833 possible that DEF_REGULAR is not set now but will be set
1834 later (it is never cleared). In case of a weak definition,
1835 DEF_REGULAR may be cleared later by a strong definition in
1836 a shared library. We account for that possibility below by
1837 storing information in the relocs_copied field of the hash
1838 table entry. A similar situation occurs when creating
1839 shared libraries and symbol visibility changes render the
1842 If on the other hand, we are creating an executable, we
1843 may need to keep relocations for symbols satisfied by a
1844 dynamic library if we manage to avoid copy relocs for the
1847 && (sec
->flags
& SEC_ALLOC
) != 0
1848 && (! IS_X86_64_PCREL_TYPE (r_type
)
1850 && (! SYMBOLIC_BIND (info
, h
)
1851 || h
->root
.type
== bfd_link_hash_defweak
1852 || !h
->def_regular
))))
1853 || (ELIMINATE_COPY_RELOCS
1855 && (sec
->flags
& SEC_ALLOC
) != 0
1857 && (h
->root
.type
== bfd_link_hash_defweak
1858 || !h
->def_regular
)))
1860 struct elf_dyn_relocs
*p
;
1861 struct elf_dyn_relocs
**head
;
1863 /* We must copy these reloc types into the output file.
1864 Create a reloc section in dynobj and make room for
1868 if (htab
->elf
.dynobj
== NULL
)
1869 htab
->elf
.dynobj
= abfd
;
1871 sreloc
= _bfd_elf_make_dynamic_reloc_section
1872 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
1873 abfd
, /*rela?*/ TRUE
);
1879 /* If this is a global symbol, we count the number of
1880 relocations we need for this symbol. */
1883 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1887 /* Track dynamic relocs needed for local syms too.
1888 We really need local syms available to do this
1893 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1898 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1902 /* Beware of type punned pointers vs strict aliasing
1904 vpp
= &(elf_section_data (s
)->local_dynrel
);
1905 head
= (struct elf_dyn_relocs
**)vpp
;
1909 if (p
== NULL
|| p
->sec
!= sec
)
1911 bfd_size_type amt
= sizeof *p
;
1913 p
= ((struct elf_dyn_relocs
*)
1914 bfd_alloc (htab
->elf
.dynobj
, amt
));
1925 if (IS_X86_64_PCREL_TYPE (r_type
))
1930 /* This relocation describes the C++ object vtable hierarchy.
1931 Reconstruct it for later use during GC. */
1932 case R_X86_64_GNU_VTINHERIT
:
1933 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1937 /* This relocation describes which C++ vtable entries are actually
1938 used. Record for later use during GC. */
1939 case R_X86_64_GNU_VTENTRY
:
1940 BFD_ASSERT (h
!= NULL
);
1942 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1954 /* Return the section that should be marked against GC for a given
1958 elf_x86_64_gc_mark_hook (asection
*sec
,
1959 struct bfd_link_info
*info
,
1960 Elf_Internal_Rela
*rel
,
1961 struct elf_link_hash_entry
*h
,
1962 Elf_Internal_Sym
*sym
)
1965 switch (ELF32_R_TYPE (rel
->r_info
))
1967 case R_X86_64_GNU_VTINHERIT
:
1968 case R_X86_64_GNU_VTENTRY
:
1972 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1975 /* Update the got entry reference counts for the section being removed. */
1978 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1980 const Elf_Internal_Rela
*relocs
)
1982 struct elf_x86_64_link_hash_table
*htab
;
1983 Elf_Internal_Shdr
*symtab_hdr
;
1984 struct elf_link_hash_entry
**sym_hashes
;
1985 bfd_signed_vma
*local_got_refcounts
;
1986 const Elf_Internal_Rela
*rel
, *relend
;
1988 if (info
->relocatable
)
1991 htab
= elf_x86_64_hash_table (info
);
1995 elf_section_data (sec
)->local_dynrel
= NULL
;
1997 symtab_hdr
= &elf_symtab_hdr (abfd
);
1998 sym_hashes
= elf_sym_hashes (abfd
);
1999 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2001 htab
= elf_x86_64_hash_table (info
);
2002 relend
= relocs
+ sec
->reloc_count
;
2003 for (rel
= relocs
; rel
< relend
; rel
++)
2005 unsigned long r_symndx
;
2006 unsigned int r_type
;
2007 struct elf_link_hash_entry
*h
= NULL
;
2009 r_symndx
= htab
->r_sym (rel
->r_info
);
2010 if (r_symndx
>= symtab_hdr
->sh_info
)
2012 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2013 while (h
->root
.type
== bfd_link_hash_indirect
2014 || h
->root
.type
== bfd_link_hash_warning
)
2015 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2019 /* A local symbol. */
2020 Elf_Internal_Sym
*isym
;
2022 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2025 /* Check relocation against local STT_GNU_IFUNC symbol. */
2027 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2029 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2037 struct elf_x86_64_link_hash_entry
*eh
;
2038 struct elf_dyn_relocs
**pp
;
2039 struct elf_dyn_relocs
*p
;
2041 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2043 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2046 /* Everything must go for SEC. */
2052 r_type
= ELF32_R_TYPE (rel
->r_info
);
2053 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2054 symtab_hdr
, sym_hashes
,
2055 &r_type
, GOT_UNKNOWN
,
2056 rel
, relend
, h
, r_symndx
))
2061 case R_X86_64_TLSLD
:
2062 if (htab
->tls_ld_got
.refcount
> 0)
2063 htab
->tls_ld_got
.refcount
-= 1;
2066 case R_X86_64_TLSGD
:
2067 case R_X86_64_GOTPC32_TLSDESC
:
2068 case R_X86_64_TLSDESC_CALL
:
2069 case R_X86_64_GOTTPOFF
:
2070 case R_X86_64_GOT32
:
2071 case R_X86_64_GOTPCREL
:
2072 case R_X86_64_GOT64
:
2073 case R_X86_64_GOTPCREL64
:
2074 case R_X86_64_GOTPLT64
:
2077 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
2078 h
->plt
.refcount
-= 1;
2079 if (h
->got
.refcount
> 0)
2080 h
->got
.refcount
-= 1;
2081 if (h
->type
== STT_GNU_IFUNC
)
2083 if (h
->plt
.refcount
> 0)
2084 h
->plt
.refcount
-= 1;
2087 else if (local_got_refcounts
!= NULL
)
2089 if (local_got_refcounts
[r_symndx
] > 0)
2090 local_got_refcounts
[r_symndx
] -= 1;
2104 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2108 case R_X86_64_PLT32
:
2109 case R_X86_64_PLTOFF64
:
2112 if (h
->plt
.refcount
> 0)
2113 h
->plt
.refcount
-= 1;
2125 /* Adjust a symbol defined by a dynamic object and referenced by a
2126 regular object. The current definition is in some section of the
2127 dynamic object, but we're not including those sections. We have to
2128 change the definition to something the rest of the link can
2132 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2133 struct elf_link_hash_entry
*h
)
2135 struct elf_x86_64_link_hash_table
*htab
;
2138 /* STT_GNU_IFUNC symbol must go through PLT. */
2139 if (h
->type
== STT_GNU_IFUNC
)
2141 if (h
->plt
.refcount
<= 0)
2143 h
->plt
.offset
= (bfd_vma
) -1;
2149 /* If this is a function, put it in the procedure linkage table. We
2150 will fill in the contents of the procedure linkage table later,
2151 when we know the address of the .got section. */
2152 if (h
->type
== STT_FUNC
2155 if (h
->plt
.refcount
<= 0
2156 || SYMBOL_CALLS_LOCAL (info
, h
)
2157 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2158 && h
->root
.type
== bfd_link_hash_undefweak
))
2160 /* This case can occur if we saw a PLT32 reloc in an input
2161 file, but the symbol was never referred to by a dynamic
2162 object, or if all references were garbage collected. In
2163 such a case, we don't actually need to build a procedure
2164 linkage table, and we can just do a PC32 reloc instead. */
2165 h
->plt
.offset
= (bfd_vma
) -1;
2172 /* It's possible that we incorrectly decided a .plt reloc was
2173 needed for an R_X86_64_PC32 reloc to a non-function sym in
2174 check_relocs. We can't decide accurately between function and
2175 non-function syms in check-relocs; Objects loaded later in
2176 the link may change h->type. So fix it now. */
2177 h
->plt
.offset
= (bfd_vma
) -1;
2179 /* If this is a weak symbol, and there is a real definition, the
2180 processor independent code will have arranged for us to see the
2181 real definition first, and we can just use the same value. */
2182 if (h
->u
.weakdef
!= NULL
)
2184 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2185 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2186 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2187 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2188 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2189 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2193 /* This is a reference to a symbol defined by a dynamic object which
2194 is not a function. */
2196 /* If we are creating a shared library, we must presume that the
2197 only references to the symbol are via the global offset table.
2198 For such cases we need not do anything here; the relocations will
2199 be handled correctly by relocate_section. */
2203 /* If there are no references to this symbol that do not use the
2204 GOT, we don't need to generate a copy reloc. */
2205 if (!h
->non_got_ref
)
2208 /* If -z nocopyreloc was given, we won't generate them either. */
2209 if (info
->nocopyreloc
)
2215 if (ELIMINATE_COPY_RELOCS
)
2217 struct elf_x86_64_link_hash_entry
* eh
;
2218 struct elf_dyn_relocs
*p
;
2220 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2221 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2223 s
= p
->sec
->output_section
;
2224 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2228 /* If we didn't find any dynamic relocs in read-only sections, then
2229 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2237 /* We must allocate the symbol in our .dynbss section, which will
2238 become part of the .bss section of the executable. There will be
2239 an entry for this symbol in the .dynsym section. The dynamic
2240 object will contain position independent code, so all references
2241 from the dynamic object to this symbol will go through the global
2242 offset table. The dynamic linker will use the .dynsym entry to
2243 determine the address it must put in the global offset table, so
2244 both the dynamic object and the regular object will refer to the
2245 same memory location for the variable. */
2247 htab
= elf_x86_64_hash_table (info
);
2251 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2252 to copy the initial value out of the dynamic object and into the
2253 runtime process image. */
2254 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2256 const struct elf_backend_data
*bed
;
2257 bed
= get_elf_backend_data (info
->output_bfd
);
2258 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2264 return _bfd_elf_adjust_dynamic_copy (h
, s
);
2267 /* Allocate space in .plt, .got and associated reloc sections for
2271 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2273 struct bfd_link_info
*info
;
2274 struct elf_x86_64_link_hash_table
*htab
;
2275 struct elf_x86_64_link_hash_entry
*eh
;
2276 struct elf_dyn_relocs
*p
;
2277 const struct elf_backend_data
*bed
;
2278 unsigned int plt_entry_size
;
2280 if (h
->root
.type
== bfd_link_hash_indirect
)
2283 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2285 info
= (struct bfd_link_info
*) inf
;
2286 htab
= elf_x86_64_hash_table (info
);
2289 bed
= get_elf_backend_data (info
->output_bfd
);
2290 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2292 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2293 here if it is defined and referenced in a non-shared object. */
2294 if (h
->type
== STT_GNU_IFUNC
2296 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2300 else if (htab
->elf
.dynamic_sections_created
2301 && h
->plt
.refcount
> 0)
2303 /* Make sure this symbol is output as a dynamic symbol.
2304 Undefined weak syms won't yet be marked as dynamic. */
2305 if (h
->dynindx
== -1
2306 && !h
->forced_local
)
2308 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2313 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2315 asection
*s
= htab
->elf
.splt
;
2317 /* If this is the first .plt entry, make room for the special
2320 s
->size
+= plt_entry_size
;
2322 h
->plt
.offset
= s
->size
;
2324 /* If this symbol is not defined in a regular file, and we are
2325 not generating a shared library, then set the symbol to this
2326 location in the .plt. This is required to make function
2327 pointers compare as equal between the normal executable and
2328 the shared library. */
2332 h
->root
.u
.def
.section
= s
;
2333 h
->root
.u
.def
.value
= h
->plt
.offset
;
2336 /* Make room for this entry. */
2337 s
->size
+= plt_entry_size
;
2339 /* We also need to make an entry in the .got.plt section, which
2340 will be placed in the .got section by the linker script. */
2341 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2343 /* We also need to make an entry in the .rela.plt section. */
2344 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2345 htab
->elf
.srelplt
->reloc_count
++;
2349 h
->plt
.offset
= (bfd_vma
) -1;
2355 h
->plt
.offset
= (bfd_vma
) -1;
2359 eh
->tlsdesc_got
= (bfd_vma
) -1;
2361 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2362 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2363 if (h
->got
.refcount
> 0
2366 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2368 h
->got
.offset
= (bfd_vma
) -1;
2370 else if (h
->got
.refcount
> 0)
2374 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2376 /* Make sure this symbol is output as a dynamic symbol.
2377 Undefined weak syms won't yet be marked as dynamic. */
2378 if (h
->dynindx
== -1
2379 && !h
->forced_local
)
2381 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2385 if (GOT_TLS_GDESC_P (tls_type
))
2387 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2388 - elf_x86_64_compute_jump_table_size (htab
);
2389 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2390 h
->got
.offset
= (bfd_vma
) -2;
2392 if (! GOT_TLS_GDESC_P (tls_type
)
2393 || GOT_TLS_GD_P (tls_type
))
2396 h
->got
.offset
= s
->size
;
2397 s
->size
+= GOT_ENTRY_SIZE
;
2398 if (GOT_TLS_GD_P (tls_type
))
2399 s
->size
+= GOT_ENTRY_SIZE
;
2401 dyn
= htab
->elf
.dynamic_sections_created
;
2402 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2404 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2405 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2406 || tls_type
== GOT_TLS_IE
)
2407 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2408 else if (GOT_TLS_GD_P (tls_type
))
2409 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2410 else if (! GOT_TLS_GDESC_P (tls_type
)
2411 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2412 || h
->root
.type
!= bfd_link_hash_undefweak
)
2414 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2415 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2416 if (GOT_TLS_GDESC_P (tls_type
))
2418 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2419 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2423 h
->got
.offset
= (bfd_vma
) -1;
2425 if (eh
->dyn_relocs
== NULL
)
2428 /* In the shared -Bsymbolic case, discard space allocated for
2429 dynamic pc-relative relocs against symbols which turn out to be
2430 defined in regular objects. For the normal shared case, discard
2431 space for pc-relative relocs that have become local due to symbol
2432 visibility changes. */
2436 /* Relocs that use pc_count are those that appear on a call
2437 insn, or certain REL relocs that can generated via assembly.
2438 We want calls to protected symbols to resolve directly to the
2439 function rather than going via the plt. If people want
2440 function pointer comparisons to work as expected then they
2441 should avoid writing weird assembly. */
2442 if (SYMBOL_CALLS_LOCAL (info
, h
))
2444 struct elf_dyn_relocs
**pp
;
2446 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2448 p
->count
-= p
->pc_count
;
2457 /* Also discard relocs on undefined weak syms with non-default
2459 if (eh
->dyn_relocs
!= NULL
2460 && h
->root
.type
== bfd_link_hash_undefweak
)
2462 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2463 eh
->dyn_relocs
= NULL
;
2465 /* Make sure undefined weak symbols are output as a dynamic
2467 else if (h
->dynindx
== -1
2468 && ! h
->forced_local
2469 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2474 else if (ELIMINATE_COPY_RELOCS
)
2476 /* For the non-shared case, discard space for relocs against
2477 symbols which turn out to need copy relocs or are not
2483 || (htab
->elf
.dynamic_sections_created
2484 && (h
->root
.type
== bfd_link_hash_undefweak
2485 || h
->root
.type
== bfd_link_hash_undefined
))))
2487 /* Make sure this symbol is output as a dynamic symbol.
2488 Undefined weak syms won't yet be marked as dynamic. */
2489 if (h
->dynindx
== -1
2490 && ! h
->forced_local
2491 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2494 /* If that succeeded, we know we'll be keeping all the
2496 if (h
->dynindx
!= -1)
2500 eh
->dyn_relocs
= NULL
;
2505 /* Finally, allocate space. */
2506 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2510 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2512 BFD_ASSERT (sreloc
!= NULL
);
2514 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2520 /* Allocate space in .plt, .got and associated reloc sections for
2521 local dynamic relocs. */
2524 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2526 struct elf_link_hash_entry
*h
2527 = (struct elf_link_hash_entry
*) *slot
;
2529 if (h
->type
!= STT_GNU_IFUNC
2533 || h
->root
.type
!= bfd_link_hash_defined
)
2536 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2539 /* Find any dynamic relocs that apply to read-only sections. */
2542 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2545 struct elf_x86_64_link_hash_entry
*eh
;
2546 struct elf_dyn_relocs
*p
;
2548 /* Skip local IFUNC symbols. */
2549 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2552 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2553 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2555 asection
*s
= p
->sec
->output_section
;
2557 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2559 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2561 info
->flags
|= DF_TEXTREL
;
2563 if (info
->warn_shared_textrel
&& info
->shared
)
2564 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2565 p
->sec
->owner
, h
->root
.root
.string
,
2568 /* Not an error, just cut short the traversal. */
2575 /* Set the sizes of the dynamic sections. */
2578 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
2579 struct bfd_link_info
*info
)
2581 struct elf_x86_64_link_hash_table
*htab
;
2586 const struct elf_backend_data
*bed
;
2588 htab
= elf_x86_64_hash_table (info
);
2591 bed
= get_elf_backend_data (output_bfd
);
2593 dynobj
= htab
->elf
.dynobj
;
2597 if (htab
->elf
.dynamic_sections_created
)
2599 /* Set the contents of the .interp section to the interpreter. */
2600 if (info
->executable
)
2602 s
= bfd_get_linker_section (dynobj
, ".interp");
2605 s
->size
= htab
->dynamic_interpreter_size
;
2606 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2610 /* Set up .got offsets for local syms, and space for local dynamic
2612 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2614 bfd_signed_vma
*local_got
;
2615 bfd_signed_vma
*end_local_got
;
2616 char *local_tls_type
;
2617 bfd_vma
*local_tlsdesc_gotent
;
2618 bfd_size_type locsymcount
;
2619 Elf_Internal_Shdr
*symtab_hdr
;
2622 if (! is_x86_64_elf (ibfd
))
2625 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2627 struct elf_dyn_relocs
*p
;
2629 for (p
= (struct elf_dyn_relocs
*)
2630 (elf_section_data (s
)->local_dynrel
);
2634 if (!bfd_is_abs_section (p
->sec
)
2635 && bfd_is_abs_section (p
->sec
->output_section
))
2637 /* Input section has been discarded, either because
2638 it is a copy of a linkonce section or due to
2639 linker script /DISCARD/, so we'll be discarding
2642 else if (p
->count
!= 0)
2644 srel
= elf_section_data (p
->sec
)->sreloc
;
2645 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2646 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
2647 && (info
->flags
& DF_TEXTREL
) == 0)
2649 info
->flags
|= DF_TEXTREL
;
2650 if (info
->warn_shared_textrel
&& info
->shared
)
2651 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2652 p
->sec
->owner
, p
->sec
);
2658 local_got
= elf_local_got_refcounts (ibfd
);
2662 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2663 locsymcount
= symtab_hdr
->sh_info
;
2664 end_local_got
= local_got
+ locsymcount
;
2665 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
2666 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
2668 srel
= htab
->elf
.srelgot
;
2669 for (; local_got
< end_local_got
;
2670 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2672 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2675 if (GOT_TLS_GDESC_P (*local_tls_type
))
2677 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2678 - elf_x86_64_compute_jump_table_size (htab
);
2679 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2680 *local_got
= (bfd_vma
) -2;
2682 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2683 || GOT_TLS_GD_P (*local_tls_type
))
2685 *local_got
= s
->size
;
2686 s
->size
+= GOT_ENTRY_SIZE
;
2687 if (GOT_TLS_GD_P (*local_tls_type
))
2688 s
->size
+= GOT_ENTRY_SIZE
;
2691 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2692 || *local_tls_type
== GOT_TLS_IE
)
2694 if (GOT_TLS_GDESC_P (*local_tls_type
))
2696 htab
->elf
.srelplt
->size
2697 += bed
->s
->sizeof_rela
;
2698 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2700 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2701 || GOT_TLS_GD_P (*local_tls_type
))
2702 srel
->size
+= bed
->s
->sizeof_rela
;
2706 *local_got
= (bfd_vma
) -1;
2710 if (htab
->tls_ld_got
.refcount
> 0)
2712 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2714 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2715 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2716 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2719 htab
->tls_ld_got
.offset
= -1;
2721 /* Allocate global sym .plt and .got entries, and space for global
2722 sym dynamic relocs. */
2723 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
2726 /* Allocate .plt and .got entries, and space for local symbols. */
2727 htab_traverse (htab
->loc_hash_table
,
2728 elf_x86_64_allocate_local_dynrelocs
,
2731 /* For every jump slot reserved in the sgotplt, reloc_count is
2732 incremented. However, when we reserve space for TLS descriptors,
2733 it's not incremented, so in order to compute the space reserved
2734 for them, it suffices to multiply the reloc count by the jump
2737 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2738 so that R_X86_64_IRELATIVE entries come last. */
2739 if (htab
->elf
.srelplt
)
2741 htab
->sgotplt_jump_table_size
2742 = elf_x86_64_compute_jump_table_size (htab
);
2743 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
2745 else if (htab
->elf
.irelplt
)
2746 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
2748 if (htab
->tlsdesc_plt
)
2750 /* If we're not using lazy TLS relocations, don't generate the
2751 PLT and GOT entries they require. */
2752 if ((info
->flags
& DF_BIND_NOW
))
2753 htab
->tlsdesc_plt
= 0;
2756 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2757 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2758 /* Reserve room for the initial entry.
2759 FIXME: we could probably do away with it in this case. */
2760 if (htab
->elf
.splt
->size
== 0)
2761 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
2762 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2763 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
2767 if (htab
->elf
.sgotplt
)
2769 struct elf_link_hash_entry
*got
;
2770 got
= elf_link_hash_lookup (elf_hash_table (info
),
2771 "_GLOBAL_OFFSET_TABLE_",
2772 FALSE
, FALSE
, FALSE
);
2774 /* Don't allocate .got.plt section if there are no GOT nor PLT
2775 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2777 || !got
->ref_regular_nonweak
)
2778 && (htab
->elf
.sgotplt
->size
2779 == get_elf_backend_data (output_bfd
)->got_header_size
)
2780 && (htab
->elf
.splt
== NULL
2781 || htab
->elf
.splt
->size
== 0)
2782 && (htab
->elf
.sgot
== NULL
2783 || htab
->elf
.sgot
->size
== 0)
2784 && (htab
->elf
.iplt
== NULL
2785 || htab
->elf
.iplt
->size
== 0)
2786 && (htab
->elf
.igotplt
== NULL
2787 || htab
->elf
.igotplt
->size
== 0))
2788 htab
->elf
.sgotplt
->size
= 0;
2791 if (htab
->plt_eh_frame
!= NULL
2792 && htab
->elf
.splt
!= NULL
2793 && htab
->elf
.splt
->size
!= 0
2794 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
2795 && _bfd_elf_eh_frame_present (info
))
2797 const struct elf_x86_64_backend_data
*arch_data
2798 = (const struct elf_x86_64_backend_data
*) bed
->arch_data
;
2799 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
2802 /* We now have determined the sizes of the various dynamic sections.
2803 Allocate memory for them. */
2805 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2807 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2810 if (s
== htab
->elf
.splt
2811 || s
== htab
->elf
.sgot
2812 || s
== htab
->elf
.sgotplt
2813 || s
== htab
->elf
.iplt
2814 || s
== htab
->elf
.igotplt
2815 || s
== htab
->plt_eh_frame
2816 || s
== htab
->sdynbss
)
2818 /* Strip this section if we don't need it; see the
2821 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2823 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2826 /* We use the reloc_count field as a counter if we need
2827 to copy relocs into the output file. */
2828 if (s
!= htab
->elf
.srelplt
)
2833 /* It's not one of our sections, so don't allocate space. */
2839 /* If we don't need this section, strip it from the
2840 output file. This is mostly to handle .rela.bss and
2841 .rela.plt. We must create both sections in
2842 create_dynamic_sections, because they must be created
2843 before the linker maps input sections to output
2844 sections. The linker does that before
2845 adjust_dynamic_symbol is called, and it is that
2846 function which decides whether anything needs to go
2847 into these sections. */
2849 s
->flags
|= SEC_EXCLUDE
;
2853 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2856 /* Allocate memory for the section contents. We use bfd_zalloc
2857 here in case unused entries are not reclaimed before the
2858 section's contents are written out. This should not happen,
2859 but this way if it does, we get a R_X86_64_NONE reloc instead
2861 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2862 if (s
->contents
== NULL
)
2866 if (htab
->plt_eh_frame
!= NULL
2867 && htab
->plt_eh_frame
->contents
!= NULL
)
2869 const struct elf_x86_64_backend_data
*arch_data
2870 = (const struct elf_x86_64_backend_data
*) bed
->arch_data
;
2872 memcpy (htab
->plt_eh_frame
->contents
,
2873 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
2874 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
2875 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
2878 if (htab
->elf
.dynamic_sections_created
)
2880 /* Add some entries to the .dynamic section. We fill in the
2881 values later, in elf_x86_64_finish_dynamic_sections, but we
2882 must add the entries now so that we get the correct size for
2883 the .dynamic section. The DT_DEBUG entry is filled in by the
2884 dynamic linker and used by the debugger. */
2885 #define add_dynamic_entry(TAG, VAL) \
2886 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2888 if (info
->executable
)
2890 if (!add_dynamic_entry (DT_DEBUG
, 0))
2894 if (htab
->elf
.splt
->size
!= 0)
2896 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2897 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2898 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2899 || !add_dynamic_entry (DT_JMPREL
, 0))
2902 if (htab
->tlsdesc_plt
2903 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2904 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2910 if (!add_dynamic_entry (DT_RELA
, 0)
2911 || !add_dynamic_entry (DT_RELASZ
, 0)
2912 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
2915 /* If any dynamic relocs apply to a read-only section,
2916 then we need a DT_TEXTREL entry. */
2917 if ((info
->flags
& DF_TEXTREL
) == 0)
2918 elf_link_hash_traverse (&htab
->elf
,
2919 elf_x86_64_readonly_dynrelocs
,
2922 if ((info
->flags
& DF_TEXTREL
) != 0)
2924 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2929 #undef add_dynamic_entry
2935 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2936 struct bfd_link_info
*info
)
2938 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2942 struct elf_link_hash_entry
*tlsbase
;
2944 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2945 "_TLS_MODULE_BASE_",
2946 FALSE
, FALSE
, FALSE
);
2948 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2950 struct elf_x86_64_link_hash_table
*htab
;
2951 struct bfd_link_hash_entry
*bh
= NULL
;
2952 const struct elf_backend_data
*bed
2953 = get_elf_backend_data (output_bfd
);
2955 htab
= elf_x86_64_hash_table (info
);
2959 if (!(_bfd_generic_link_add_one_symbol
2960 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2961 tls_sec
, 0, NULL
, FALSE
,
2962 bed
->collect
, &bh
)))
2965 htab
->tls_module_base
= bh
;
2967 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2968 tlsbase
->def_regular
= 1;
2969 tlsbase
->other
= STV_HIDDEN
;
2970 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2977 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2978 executables. Rather than setting it to the beginning of the TLS
2979 section, we have to set it to the end. This function may be called
2980 multiple times, it is idempotent. */
2983 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2985 struct elf_x86_64_link_hash_table
*htab
;
2986 struct bfd_link_hash_entry
*base
;
2988 if (!info
->executable
)
2991 htab
= elf_x86_64_hash_table (info
);
2995 base
= htab
->tls_module_base
;
2999 base
->u
.def
.value
= htab
->elf
.tls_size
;
3002 /* Return the base VMA address which should be subtracted from real addresses
3003 when resolving @dtpoff relocation.
3004 This is PT_TLS segment p_vaddr. */
3007 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3009 /* If tls_sec is NULL, we should have signalled an error already. */
3010 if (elf_hash_table (info
)->tls_sec
== NULL
)
3012 return elf_hash_table (info
)->tls_sec
->vma
;
3015 /* Return the relocation value for @tpoff relocation
3016 if STT_TLS virtual address is ADDRESS. */
3019 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3021 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3022 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3023 bfd_vma static_tls_size
;
3025 /* If tls_segment is NULL, we should have signalled an error already. */
3026 if (htab
->tls_sec
== NULL
)
3029 /* Consider special static TLS alignment requirements. */
3030 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3031 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3034 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3038 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3040 /* Opcode Instruction
3043 0x0f 0x8x conditional jump */
3045 && (contents
[offset
- 1] == 0xe8
3046 || contents
[offset
- 1] == 0xe9))
3048 && contents
[offset
- 2] == 0x0f
3049 && (contents
[offset
- 1] & 0xf0) == 0x80));
3052 /* Relocate an x86_64 ELF section. */
3055 elf_x86_64_relocate_section (bfd
*output_bfd
,
3056 struct bfd_link_info
*info
,
3058 asection
*input_section
,
3060 Elf_Internal_Rela
*relocs
,
3061 Elf_Internal_Sym
*local_syms
,
3062 asection
**local_sections
)
3064 struct elf_x86_64_link_hash_table
*htab
;
3065 Elf_Internal_Shdr
*symtab_hdr
;
3066 struct elf_link_hash_entry
**sym_hashes
;
3067 bfd_vma
*local_got_offsets
;
3068 bfd_vma
*local_tlsdesc_gotents
;
3069 Elf_Internal_Rela
*rel
;
3070 Elf_Internal_Rela
*relend
;
3071 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3073 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3075 htab
= elf_x86_64_hash_table (info
);
3078 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3079 sym_hashes
= elf_sym_hashes (input_bfd
);
3080 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3081 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3083 elf_x86_64_set_tls_module_base (info
);
3086 relend
= relocs
+ input_section
->reloc_count
;
3087 for (; rel
< relend
; rel
++)
3089 unsigned int r_type
;
3090 reloc_howto_type
*howto
;
3091 unsigned long r_symndx
;
3092 struct elf_link_hash_entry
*h
;
3093 Elf_Internal_Sym
*sym
;
3095 bfd_vma off
, offplt
;
3097 bfd_boolean unresolved_reloc
;
3098 bfd_reloc_status_type r
;
3102 r_type
= ELF32_R_TYPE (rel
->r_info
);
3103 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3104 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3107 if (r_type
>= R_X86_64_max
)
3109 bfd_set_error (bfd_error_bad_value
);
3113 if (r_type
!= (int) R_X86_64_32
3114 || ABI_64_P (output_bfd
))
3115 howto
= x86_64_elf_howto_table
+ r_type
;
3117 howto
= (x86_64_elf_howto_table
3118 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3119 r_symndx
= htab
->r_sym (rel
->r_info
);
3123 unresolved_reloc
= FALSE
;
3124 if (r_symndx
< symtab_hdr
->sh_info
)
3126 sym
= local_syms
+ r_symndx
;
3127 sec
= local_sections
[r_symndx
];
3129 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3132 /* Relocate against local STT_GNU_IFUNC symbol. */
3133 if (!info
->relocatable
3134 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3136 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3141 /* Set STT_GNU_IFUNC symbol value. */
3142 h
->root
.u
.def
.value
= sym
->st_value
;
3143 h
->root
.u
.def
.section
= sec
;
3148 bfd_boolean warned ATTRIBUTE_UNUSED
;
3150 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3151 r_symndx
, symtab_hdr
, sym_hashes
,
3153 unresolved_reloc
, warned
);
3156 if (sec
!= NULL
&& discarded_section (sec
))
3157 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3158 rel
, 1, relend
, howto
, 0, contents
);
3160 if (info
->relocatable
)
3163 if (rel
->r_addend
== 0
3164 && r_type
== R_X86_64_64
3165 && !ABI_64_P (output_bfd
))
3167 /* For x32, treat R_X86_64_64 like R_X86_64_32 and zero-extend
3168 it to 64bit if addend is zero. */
3169 r_type
= R_X86_64_32
;
3170 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3173 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3174 it here if it is defined in a non-shared object. */
3176 && h
->type
== STT_GNU_IFUNC
3183 if ((input_section
->flags
& SEC_ALLOC
) == 0
3184 || h
->plt
.offset
== (bfd_vma
) -1)
3187 /* STT_GNU_IFUNC symbol must go through PLT. */
3188 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
3189 relocation
= (plt
->output_section
->vma
3190 + plt
->output_offset
+ h
->plt
.offset
);
3195 if (h
->root
.root
.string
)
3196 name
= h
->root
.root
.string
;
3198 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3200 (*_bfd_error_handler
)
3201 (_("%B: relocation %s against STT_GNU_IFUNC "
3202 "symbol `%s' isn't handled by %s"), input_bfd
,
3203 x86_64_elf_howto_table
[r_type
].name
,
3204 name
, __FUNCTION__
);
3205 bfd_set_error (bfd_error_bad_value
);
3214 if (ABI_64_P (output_bfd
))
3218 if (rel
->r_addend
!= 0)
3220 if (h
->root
.root
.string
)
3221 name
= h
->root
.root
.string
;
3223 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3225 (*_bfd_error_handler
)
3226 (_("%B: relocation %s against STT_GNU_IFUNC "
3227 "symbol `%s' has non-zero addend: %d"),
3228 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
3229 name
, rel
->r_addend
);
3230 bfd_set_error (bfd_error_bad_value
);
3234 /* Generate dynamic relcoation only when there is a
3235 non-GOT reference in a shared object. */
3236 if (info
->shared
&& h
->non_got_ref
)
3238 Elf_Internal_Rela outrel
;
3241 /* Need a dynamic relocation to get the real function
3243 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
3247 if (outrel
.r_offset
== (bfd_vma
) -1
3248 || outrel
.r_offset
== (bfd_vma
) -2)
3251 outrel
.r_offset
+= (input_section
->output_section
->vma
3252 + input_section
->output_offset
);
3254 if (h
->dynindx
== -1
3256 || info
->executable
)
3258 /* This symbol is resolved locally. */
3259 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3260 outrel
.r_addend
= (h
->root
.u
.def
.value
3261 + h
->root
.u
.def
.section
->output_section
->vma
3262 + h
->root
.u
.def
.section
->output_offset
);
3266 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3267 outrel
.r_addend
= 0;
3270 sreloc
= htab
->elf
.irelifunc
;
3271 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3273 /* If this reloc is against an external symbol, we
3274 do not want to fiddle with the addend. Otherwise,
3275 we need to include the symbol value so that it
3276 becomes an addend for the dynamic reloc. For an
3277 internal symbol, we have updated addend. */
3283 case R_X86_64_PLT32
:
3286 case R_X86_64_GOTPCREL
:
3287 case R_X86_64_GOTPCREL64
:
3288 base_got
= htab
->elf
.sgot
;
3289 off
= h
->got
.offset
;
3291 if (base_got
== NULL
)
3294 if (off
== (bfd_vma
) -1)
3296 /* We can't use h->got.offset here to save state, or
3297 even just remember the offset, as finish_dynamic_symbol
3298 would use that as offset into .got. */
3300 if (htab
->elf
.splt
!= NULL
)
3302 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3303 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3304 base_got
= htab
->elf
.sgotplt
;
3308 plt_index
= h
->plt
.offset
/ plt_entry_size
;
3309 off
= plt_index
* GOT_ENTRY_SIZE
;
3310 base_got
= htab
->elf
.igotplt
;
3313 if (h
->dynindx
== -1
3317 /* This references the local defitionion. We must
3318 initialize this entry in the global offset table.
3319 Since the offset must always be a multiple of 8,
3320 we use the least significant bit to record
3321 whether we have initialized it already.
3323 When doing a dynamic link, we create a .rela.got
3324 relocation entry to initialize the value. This
3325 is done in the finish_dynamic_symbol routine. */
3330 bfd_put_64 (output_bfd
, relocation
,
3331 base_got
->contents
+ off
);
3332 /* Note that this is harmless for the GOTPLT64
3333 case, as -1 | 1 still is -1. */
3339 relocation
= (base_got
->output_section
->vma
3340 + base_got
->output_offset
+ off
);
3346 /* When generating a shared object, the relocations handled here are
3347 copied into the output file to be resolved at run time. */
3350 case R_X86_64_GOT32
:
3351 case R_X86_64_GOT64
:
3352 /* Relocation is to the entry for this symbol in the global
3354 case R_X86_64_GOTPCREL
:
3355 case R_X86_64_GOTPCREL64
:
3356 /* Use global offset table entry as symbol value. */
3357 case R_X86_64_GOTPLT64
:
3358 /* This is the same as GOT64 for relocation purposes, but
3359 indicates the existence of a PLT entry. The difficulty is,
3360 that we must calculate the GOT slot offset from the PLT
3361 offset, if this symbol got a PLT entry (it was global).
3362 Additionally if it's computed from the PLT entry, then that
3363 GOT offset is relative to .got.plt, not to .got. */
3364 base_got
= htab
->elf
.sgot
;
3366 if (htab
->elf
.sgot
== NULL
)
3373 off
= h
->got
.offset
;
3375 && h
->plt
.offset
!= (bfd_vma
)-1
3376 && off
== (bfd_vma
)-1)
3378 /* We can't use h->got.offset here to save
3379 state, or even just remember the offset, as
3380 finish_dynamic_symbol would use that as offset into
3382 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3383 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3384 base_got
= htab
->elf
.sgotplt
;
3387 dyn
= htab
->elf
.dynamic_sections_created
;
3389 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3391 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3392 || (ELF_ST_VISIBILITY (h
->other
)
3393 && h
->root
.type
== bfd_link_hash_undefweak
))
3395 /* This is actually a static link, or it is a -Bsymbolic
3396 link and the symbol is defined locally, or the symbol
3397 was forced to be local because of a version file. We
3398 must initialize this entry in the global offset table.
3399 Since the offset must always be a multiple of 8, we
3400 use the least significant bit to record whether we
3401 have initialized it already.
3403 When doing a dynamic link, we create a .rela.got
3404 relocation entry to initialize the value. This is
3405 done in the finish_dynamic_symbol routine. */
3410 bfd_put_64 (output_bfd
, relocation
,
3411 base_got
->contents
+ off
);
3412 /* Note that this is harmless for the GOTPLT64 case,
3413 as -1 | 1 still is -1. */
3418 unresolved_reloc
= FALSE
;
3422 if (local_got_offsets
== NULL
)
3425 off
= local_got_offsets
[r_symndx
];
3427 /* The offset must always be a multiple of 8. We use
3428 the least significant bit to record whether we have
3429 already generated the necessary reloc. */
3434 bfd_put_64 (output_bfd
, relocation
,
3435 base_got
->contents
+ off
);
3440 Elf_Internal_Rela outrel
;
3442 /* We need to generate a R_X86_64_RELATIVE reloc
3443 for the dynamic linker. */
3444 s
= htab
->elf
.srelgot
;
3448 outrel
.r_offset
= (base_got
->output_section
->vma
3449 + base_got
->output_offset
3451 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3452 outrel
.r_addend
= relocation
;
3453 elf_append_rela (output_bfd
, s
, &outrel
);
3456 local_got_offsets
[r_symndx
] |= 1;
3460 if (off
>= (bfd_vma
) -2)
3463 relocation
= base_got
->output_section
->vma
3464 + base_got
->output_offset
+ off
;
3465 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3466 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3467 - htab
->elf
.sgotplt
->output_offset
;
3471 case R_X86_64_GOTOFF64
:
3472 /* Relocation is relative to the start of the global offset
3475 /* Check to make sure it isn't a protected function symbol
3476 for shared library since it may not be local when used
3477 as function address. */
3478 if (!info
->executable
3480 && !SYMBOLIC_BIND (info
, h
)
3482 && h
->type
== STT_FUNC
3483 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3485 (*_bfd_error_handler
)
3486 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3487 input_bfd
, h
->root
.root
.string
);
3488 bfd_set_error (bfd_error_bad_value
);
3492 /* Note that sgot is not involved in this
3493 calculation. We always want the start of .got.plt. If we
3494 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3495 permitted by the ABI, we might have to change this
3497 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3498 + htab
->elf
.sgotplt
->output_offset
;
3501 case R_X86_64_GOTPC32
:
3502 case R_X86_64_GOTPC64
:
3503 /* Use global offset table as symbol value. */
3504 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3505 + htab
->elf
.sgotplt
->output_offset
;
3506 unresolved_reloc
= FALSE
;
3509 case R_X86_64_PLTOFF64
:
3510 /* Relocation is PLT entry relative to GOT. For local
3511 symbols it's the symbol itself relative to GOT. */
3513 /* See PLT32 handling. */
3514 && h
->plt
.offset
!= (bfd_vma
) -1
3515 && htab
->elf
.splt
!= NULL
)
3517 relocation
= (htab
->elf
.splt
->output_section
->vma
3518 + htab
->elf
.splt
->output_offset
3520 unresolved_reloc
= FALSE
;
3523 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3524 + htab
->elf
.sgotplt
->output_offset
;
3527 case R_X86_64_PLT32
:
3528 /* Relocation is to the entry for this symbol in the
3529 procedure linkage table. */
3531 /* Resolve a PLT32 reloc against a local symbol directly,
3532 without using the procedure linkage table. */
3536 if (h
->plt
.offset
== (bfd_vma
) -1
3537 || htab
->elf
.splt
== NULL
)
3539 /* We didn't make a PLT entry for this symbol. This
3540 happens when statically linking PIC code, or when
3541 using -Bsymbolic. */
3545 relocation
= (htab
->elf
.splt
->output_section
->vma
3546 + htab
->elf
.splt
->output_offset
3548 unresolved_reloc
= FALSE
;
3555 && (input_section
->flags
& SEC_ALLOC
) != 0
3556 && (input_section
->flags
& SEC_READONLY
) != 0
3559 bfd_boolean fail
= FALSE
;
3561 = (r_type
== R_X86_64_PC32
3562 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3564 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3566 /* Symbol is referenced locally. Make sure it is
3567 defined locally or for a branch. */
3568 fail
= !h
->def_regular
&& !branch
;
3572 /* Symbol isn't referenced locally. We only allow
3573 branch to symbol with non-default visibility. */
3575 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3582 const char *pic
= "";
3584 switch (ELF_ST_VISIBILITY (h
->other
))
3587 v
= _("hidden symbol");
3590 v
= _("internal symbol");
3593 v
= _("protected symbol");
3597 pic
= _("; recompile with -fPIC");
3602 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3604 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3606 (*_bfd_error_handler
) (fmt
, input_bfd
,
3607 x86_64_elf_howto_table
[r_type
].name
,
3608 v
, h
->root
.root
.string
, pic
);
3609 bfd_set_error (bfd_error_bad_value
);
3620 /* FIXME: The ABI says the linker should make sure the value is
3621 the same when it's zeroextended to 64 bit. */
3623 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3628 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3629 || h
->root
.type
!= bfd_link_hash_undefweak
)
3630 && (! IS_X86_64_PCREL_TYPE (r_type
)
3631 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3632 || (ELIMINATE_COPY_RELOCS
3639 || h
->root
.type
== bfd_link_hash_undefweak
3640 || h
->root
.type
== bfd_link_hash_undefined
)))
3642 Elf_Internal_Rela outrel
;
3643 bfd_boolean skip
, relocate
;
3646 /* When generating a shared object, these relocations
3647 are copied into the output file to be resolved at run
3653 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3655 if (outrel
.r_offset
== (bfd_vma
) -1)
3657 else if (outrel
.r_offset
== (bfd_vma
) -2)
3658 skip
= TRUE
, relocate
= TRUE
;
3660 outrel
.r_offset
+= (input_section
->output_section
->vma
3661 + input_section
->output_offset
);
3664 memset (&outrel
, 0, sizeof outrel
);
3666 /* h->dynindx may be -1 if this symbol was marked to
3670 && (IS_X86_64_PCREL_TYPE (r_type
)
3672 || ! SYMBOLIC_BIND (info
, h
)
3673 || ! h
->def_regular
))
3675 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3676 outrel
.r_addend
= rel
->r_addend
;
3680 /* This symbol is local, or marked to become local. */
3681 if (r_type
== htab
->pointer_r_type
)
3684 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3685 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3687 else if (r_type
== R_X86_64_64
3688 && !ABI_64_P (output_bfd
))
3691 outrel
.r_info
= htab
->r_info (0,
3692 R_X86_64_RELATIVE64
);
3693 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3694 /* Check addend overflow. */
3695 if ((outrel
.r_addend
& 0x80000000)
3696 != (rel
->r_addend
& 0x80000000))
3699 int addend
= rel
->r_addend
;
3700 if (h
&& h
->root
.root
.string
)
3701 name
= h
->root
.root
.string
;
3703 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3706 (*_bfd_error_handler
)
3707 (_("%B: addend -0x%x in relocation %s against "
3708 "symbol `%s' at 0x%lx in section `%A' is "
3710 input_bfd
, input_section
, addend
,
3711 x86_64_elf_howto_table
[r_type
].name
,
3712 name
, (unsigned long) rel
->r_offset
);
3714 (*_bfd_error_handler
)
3715 (_("%B: addend 0x%x in relocation %s against "
3716 "symbol `%s' at 0x%lx in section `%A' is "
3718 input_bfd
, input_section
, addend
,
3719 x86_64_elf_howto_table
[r_type
].name
,
3720 name
, (unsigned long) rel
->r_offset
);
3721 bfd_set_error (bfd_error_bad_value
);
3729 if (bfd_is_abs_section (sec
))
3731 else if (sec
== NULL
|| sec
->owner
== NULL
)
3733 bfd_set_error (bfd_error_bad_value
);
3740 /* We are turning this relocation into one
3741 against a section symbol. It would be
3742 proper to subtract the symbol's value,
3743 osec->vma, from the emitted reloc addend,
3744 but ld.so expects buggy relocs. */
3745 osec
= sec
->output_section
;
3746 sindx
= elf_section_data (osec
)->dynindx
;
3749 asection
*oi
= htab
->elf
.text_index_section
;
3750 sindx
= elf_section_data (oi
)->dynindx
;
3752 BFD_ASSERT (sindx
!= 0);
3755 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3756 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3760 sreloc
= elf_section_data (input_section
)->sreloc
;
3762 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3764 r
= bfd_reloc_notsupported
;
3765 goto check_relocation_error
;
3768 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3770 /* If this reloc is against an external symbol, we do
3771 not want to fiddle with the addend. Otherwise, we
3772 need to include the symbol value so that it becomes
3773 an addend for the dynamic reloc. */
3780 case R_X86_64_TLSGD
:
3781 case R_X86_64_GOTPC32_TLSDESC
:
3782 case R_X86_64_TLSDESC_CALL
:
3783 case R_X86_64_GOTTPOFF
:
3784 tls_type
= GOT_UNKNOWN
;
3785 if (h
== NULL
&& local_got_offsets
)
3786 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3788 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3790 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3791 input_section
, contents
,
3792 symtab_hdr
, sym_hashes
,
3793 &r_type
, tls_type
, rel
,
3794 relend
, h
, r_symndx
))
3797 if (r_type
== R_X86_64_TPOFF32
)
3799 bfd_vma roff
= rel
->r_offset
;
3801 BFD_ASSERT (! unresolved_reloc
);
3803 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3805 /* GD->LE transition. For 64bit, change
3806 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3807 .word 0x6666; rex64; call __tls_get_addr
3810 leaq foo@tpoff(%rax), %rax
3812 leaq foo@tlsgd(%rip), %rdi
3813 .word 0x6666; rex64; call __tls_get_addr
3816 leaq foo@tpoff(%rax), %rax */
3817 if (ABI_64_P (output_bfd
))
3818 memcpy (contents
+ roff
- 4,
3819 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3822 memcpy (contents
+ roff
- 3,
3823 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3825 bfd_put_32 (output_bfd
,
3826 elf_x86_64_tpoff (info
, relocation
),
3827 contents
+ roff
+ 8);
3828 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3832 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3834 /* GDesc -> LE transition.
3835 It's originally something like:
3836 leaq x@tlsdesc(%rip), %rax
3839 movl $x@tpoff, %rax. */
3841 unsigned int val
, type
;
3843 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3844 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3845 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3846 contents
+ roff
- 3);
3847 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3848 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3849 contents
+ roff
- 1);
3850 bfd_put_32 (output_bfd
,
3851 elf_x86_64_tpoff (info
, relocation
),
3855 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3857 /* GDesc -> LE transition.
3862 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3863 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3866 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3868 /* IE->LE transition:
3869 Originally it can be one of:
3870 movq foo@gottpoff(%rip), %reg
3871 addq foo@gottpoff(%rip), %reg
3874 leaq foo(%reg), %reg
3877 unsigned int val
, type
, reg
;
3879 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3880 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3881 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3887 bfd_put_8 (output_bfd
, 0x49,
3888 contents
+ roff
- 3);
3889 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3890 bfd_put_8 (output_bfd
, 0x41,
3891 contents
+ roff
- 3);
3892 bfd_put_8 (output_bfd
, 0xc7,
3893 contents
+ roff
- 2);
3894 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3895 contents
+ roff
- 1);
3899 /* addq -> addq - addressing with %rsp/%r12 is
3902 bfd_put_8 (output_bfd
, 0x49,
3903 contents
+ roff
- 3);
3904 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3905 bfd_put_8 (output_bfd
, 0x41,
3906 contents
+ roff
- 3);
3907 bfd_put_8 (output_bfd
, 0x81,
3908 contents
+ roff
- 2);
3909 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3910 contents
+ roff
- 1);
3916 bfd_put_8 (output_bfd
, 0x4d,
3917 contents
+ roff
- 3);
3918 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3919 bfd_put_8 (output_bfd
, 0x45,
3920 contents
+ roff
- 3);
3921 bfd_put_8 (output_bfd
, 0x8d,
3922 contents
+ roff
- 2);
3923 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3924 contents
+ roff
- 1);
3926 bfd_put_32 (output_bfd
,
3927 elf_x86_64_tpoff (info
, relocation
),
3935 if (htab
->elf
.sgot
== NULL
)
3940 off
= h
->got
.offset
;
3941 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
3945 if (local_got_offsets
== NULL
)
3948 off
= local_got_offsets
[r_symndx
];
3949 offplt
= local_tlsdesc_gotents
[r_symndx
];
3956 Elf_Internal_Rela outrel
;
3960 if (htab
->elf
.srelgot
== NULL
)
3963 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3965 if (GOT_TLS_GDESC_P (tls_type
))
3967 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3968 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3969 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3970 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3971 + htab
->elf
.sgotplt
->output_offset
3973 + htab
->sgotplt_jump_table_size
);
3974 sreloc
= htab
->elf
.srelplt
;
3976 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3978 outrel
.r_addend
= 0;
3979 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3982 sreloc
= htab
->elf
.srelgot
;
3984 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3985 + htab
->elf
.sgot
->output_offset
+ off
);
3987 if (GOT_TLS_GD_P (tls_type
))
3988 dr_type
= R_X86_64_DTPMOD64
;
3989 else if (GOT_TLS_GDESC_P (tls_type
))
3992 dr_type
= R_X86_64_TPOFF64
;
3994 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3995 outrel
.r_addend
= 0;
3996 if ((dr_type
== R_X86_64_TPOFF64
3997 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3998 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3999 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4001 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4003 if (GOT_TLS_GD_P (tls_type
))
4007 BFD_ASSERT (! unresolved_reloc
);
4008 bfd_put_64 (output_bfd
,
4009 relocation
- elf_x86_64_dtpoff_base (info
),
4010 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4014 bfd_put_64 (output_bfd
, 0,
4015 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4016 outrel
.r_info
= htab
->r_info (indx
,
4018 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4019 elf_append_rela (output_bfd
, sreloc
,
4028 local_got_offsets
[r_symndx
] |= 1;
4031 if (off
>= (bfd_vma
) -2
4032 && ! GOT_TLS_GDESC_P (tls_type
))
4034 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4036 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4037 || r_type
== R_X86_64_TLSDESC_CALL
)
4038 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4039 + htab
->elf
.sgotplt
->output_offset
4040 + offplt
+ htab
->sgotplt_jump_table_size
;
4042 relocation
= htab
->elf
.sgot
->output_section
->vma
4043 + htab
->elf
.sgot
->output_offset
+ off
;
4044 unresolved_reloc
= FALSE
;
4048 bfd_vma roff
= rel
->r_offset
;
4050 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4052 /* GD->IE transition. For 64bit, change
4053 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4054 .word 0x6666; rex64; call __tls_get_addr@plt
4057 addq foo@gottpoff(%rip), %rax
4059 leaq foo@tlsgd(%rip), %rdi
4060 .word 0x6666; rex64; call __tls_get_addr@plt
4063 addq foo@gottpoff(%rip), %rax */
4064 if (ABI_64_P (output_bfd
))
4065 memcpy (contents
+ roff
- 4,
4066 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4069 memcpy (contents
+ roff
- 3,
4070 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4073 relocation
= (htab
->elf
.sgot
->output_section
->vma
4074 + htab
->elf
.sgot
->output_offset
+ off
4076 - input_section
->output_section
->vma
4077 - input_section
->output_offset
4079 bfd_put_32 (output_bfd
, relocation
,
4080 contents
+ roff
+ 8);
4081 /* Skip R_X86_64_PLT32. */
4085 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4087 /* GDesc -> IE transition.
4088 It's originally something like:
4089 leaq x@tlsdesc(%rip), %rax
4092 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4094 /* Now modify the instruction as appropriate. To
4095 turn a leaq into a movq in the form we use it, it
4096 suffices to change the second byte from 0x8d to
4098 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4100 bfd_put_32 (output_bfd
,
4101 htab
->elf
.sgot
->output_section
->vma
4102 + htab
->elf
.sgot
->output_offset
+ off
4104 - input_section
->output_section
->vma
4105 - input_section
->output_offset
4110 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4112 /* GDesc -> IE transition.
4119 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4120 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4128 case R_X86_64_TLSLD
:
4129 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4130 input_section
, contents
,
4131 symtab_hdr
, sym_hashes
,
4132 &r_type
, GOT_UNKNOWN
,
4133 rel
, relend
, h
, r_symndx
))
4136 if (r_type
!= R_X86_64_TLSLD
)
4138 /* LD->LE transition:
4139 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4140 For 64bit, we change it into:
4141 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4142 For 32bit, we change it into:
4143 nopl 0x0(%rax); movl %fs:0, %eax. */
4145 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
4146 if (ABI_64_P (output_bfd
))
4147 memcpy (contents
+ rel
->r_offset
- 3,
4148 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4150 memcpy (contents
+ rel
->r_offset
- 3,
4151 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4152 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
4157 if (htab
->elf
.sgot
== NULL
)
4160 off
= htab
->tls_ld_got
.offset
;
4165 Elf_Internal_Rela outrel
;
4167 if (htab
->elf
.srelgot
== NULL
)
4170 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4171 + htab
->elf
.sgot
->output_offset
+ off
);
4173 bfd_put_64 (output_bfd
, 0,
4174 htab
->elf
.sgot
->contents
+ off
);
4175 bfd_put_64 (output_bfd
, 0,
4176 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4177 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
4178 outrel
.r_addend
= 0;
4179 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
4181 htab
->tls_ld_got
.offset
|= 1;
4183 relocation
= htab
->elf
.sgot
->output_section
->vma
4184 + htab
->elf
.sgot
->output_offset
+ off
;
4185 unresolved_reloc
= FALSE
;
4188 case R_X86_64_DTPOFF32
:
4189 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
4190 relocation
-= elf_x86_64_dtpoff_base (info
);
4192 relocation
= elf_x86_64_tpoff (info
, relocation
);
4195 case R_X86_64_TPOFF32
:
4196 case R_X86_64_TPOFF64
:
4197 BFD_ASSERT (info
->executable
);
4198 relocation
= elf_x86_64_tpoff (info
, relocation
);
4205 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4206 because such sections are not SEC_ALLOC and thus ld.so will
4207 not process them. */
4208 if (unresolved_reloc
4209 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4211 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4212 rel
->r_offset
) != (bfd_vma
) -1)
4214 (*_bfd_error_handler
)
4215 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4218 (long) rel
->r_offset
,
4220 h
->root
.root
.string
);
4225 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4226 contents
, rel
->r_offset
,
4227 relocation
, rel
->r_addend
);
4229 check_relocation_error
:
4230 if (r
!= bfd_reloc_ok
)
4235 name
= h
->root
.root
.string
;
4238 name
= bfd_elf_string_from_elf_section (input_bfd
,
4239 symtab_hdr
->sh_link
,
4244 name
= bfd_section_name (input_bfd
, sec
);
4247 if (r
== bfd_reloc_overflow
)
4249 if (! ((*info
->callbacks
->reloc_overflow
)
4250 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4251 (bfd_vma
) 0, input_bfd
, input_section
,
4257 (*_bfd_error_handler
)
4258 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4259 input_bfd
, input_section
,
4260 (long) rel
->r_offset
, name
, (int) r
);
4269 /* Finish up dynamic symbol handling. We set the contents of various
4270 dynamic sections here. */
4273 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
4274 struct bfd_link_info
*info
,
4275 struct elf_link_hash_entry
*h
,
4276 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
4278 struct elf_x86_64_link_hash_table
*htab
;
4279 const struct elf_x86_64_backend_data
*const abed
4280 = get_elf_x86_64_backend_data (output_bfd
);
4282 htab
= elf_x86_64_hash_table (info
);
4286 if (h
->plt
.offset
!= (bfd_vma
) -1)
4290 Elf_Internal_Rela rela
;
4292 asection
*plt
, *gotplt
, *relplt
;
4293 const struct elf_backend_data
*bed
;
4295 /* When building a static executable, use .iplt, .igot.plt and
4296 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4297 if (htab
->elf
.splt
!= NULL
)
4299 plt
= htab
->elf
.splt
;
4300 gotplt
= htab
->elf
.sgotplt
;
4301 relplt
= htab
->elf
.srelplt
;
4305 plt
= htab
->elf
.iplt
;
4306 gotplt
= htab
->elf
.igotplt
;
4307 relplt
= htab
->elf
.irelplt
;
4310 /* This symbol has an entry in the procedure linkage table. Set
4312 if ((h
->dynindx
== -1
4313 && !((h
->forced_local
|| info
->executable
)
4315 && h
->type
== STT_GNU_IFUNC
))
4321 /* Get the index in the procedure linkage table which
4322 corresponds to this symbol. This is the index of this symbol
4323 in all the symbols for which we are making plt entries. The
4324 first entry in the procedure linkage table is reserved.
4326 Get the offset into the .got table of the entry that
4327 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4328 bytes. The first three are reserved for the dynamic linker.
4330 For static executables, we don't reserve anything. */
4332 if (plt
== htab
->elf
.splt
)
4334 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
4335 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
4339 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
4340 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
4343 /* Fill in the entry in the procedure linkage table. */
4344 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
4345 abed
->plt_entry_size
);
4347 /* Insert the relocation positions of the plt section. */
4349 /* Put offset the PC-relative instruction referring to the GOT entry,
4350 subtracting the size of that instruction. */
4351 bfd_put_32 (output_bfd
,
4352 (gotplt
->output_section
->vma
4353 + gotplt
->output_offset
4355 - plt
->output_section
->vma
4356 - plt
->output_offset
4358 - abed
->plt_got_insn_size
),
4359 plt
->contents
+ h
->plt
.offset
+ abed
->plt_got_offset
);
4361 /* Fill in the entry in the global offset table, initially this
4362 points to the second part of the PLT entry. */
4363 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4364 + plt
->output_offset
4365 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
4366 gotplt
->contents
+ got_offset
);
4368 /* Fill in the entry in the .rela.plt section. */
4369 rela
.r_offset
= (gotplt
->output_section
->vma
4370 + gotplt
->output_offset
4372 if (h
->dynindx
== -1
4373 || ((info
->executable
4374 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4376 && h
->type
== STT_GNU_IFUNC
))
4378 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4379 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4380 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4381 rela
.r_addend
= (h
->root
.u
.def
.value
4382 + h
->root
.u
.def
.section
->output_section
->vma
4383 + h
->root
.u
.def
.section
->output_offset
);
4384 /* R_X86_64_IRELATIVE comes last. */
4385 plt_index
= htab
->next_irelative_index
--;
4389 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4391 plt_index
= htab
->next_jump_slot_index
++;
4394 /* Don't fill PLT entry for static executables. */
4395 if (plt
== htab
->elf
.splt
)
4397 /* Put relocation index. */
4398 bfd_put_32 (output_bfd
, plt_index
,
4399 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
4400 /* Put offset for jmp .PLT0. */
4401 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ abed
->plt_plt_insn_end
),
4402 plt
->contents
+ h
->plt
.offset
+ abed
->plt_plt_offset
);
4405 bed
= get_elf_backend_data (output_bfd
);
4406 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4407 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4409 if (!h
->def_regular
)
4411 /* Mark the symbol as undefined, rather than as defined in
4412 the .plt section. Leave the value if there were any
4413 relocations where pointer equality matters (this is a clue
4414 for the dynamic linker, to make function pointer
4415 comparisons work between an application and shared
4416 library), otherwise set it to zero. If a function is only
4417 called from a binary, there is no need to slow down
4418 shared libraries because of that. */
4419 sym
->st_shndx
= SHN_UNDEF
;
4420 if (!h
->pointer_equality_needed
)
4425 if (h
->got
.offset
!= (bfd_vma
) -1
4426 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
4427 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4429 Elf_Internal_Rela rela
;
4431 /* This symbol has an entry in the global offset table. Set it
4433 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4436 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4437 + htab
->elf
.sgot
->output_offset
4438 + (h
->got
.offset
&~ (bfd_vma
) 1));
4440 /* If this is a static link, or it is a -Bsymbolic link and the
4441 symbol is defined locally or was forced to be local because
4442 of a version file, we just want to emit a RELATIVE reloc.
4443 The entry in the global offset table will already have been
4444 initialized in the relocate_section function. */
4446 && h
->type
== STT_GNU_IFUNC
)
4450 /* Generate R_X86_64_GLOB_DAT. */
4457 if (!h
->pointer_equality_needed
)
4460 /* For non-shared object, we can't use .got.plt, which
4461 contains the real function addres if we need pointer
4462 equality. We load the GOT entry with the PLT entry. */
4463 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4464 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4465 + plt
->output_offset
4467 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4471 else if (info
->shared
4472 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4474 if (!h
->def_regular
)
4476 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4477 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4478 rela
.r_addend
= (h
->root
.u
.def
.value
4479 + h
->root
.u
.def
.section
->output_section
->vma
4480 + h
->root
.u
.def
.section
->output_offset
);
4484 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4486 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4487 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4488 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4492 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
4497 Elf_Internal_Rela rela
;
4499 /* This symbol needs a copy reloc. Set it up. */
4501 if (h
->dynindx
== -1
4502 || (h
->root
.type
!= bfd_link_hash_defined
4503 && h
->root
.type
!= bfd_link_hash_defweak
)
4504 || htab
->srelbss
== NULL
)
4507 rela
.r_offset
= (h
->root
.u
.def
.value
4508 + h
->root
.u
.def
.section
->output_section
->vma
4509 + h
->root
.u
.def
.section
->output_offset
);
4510 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4512 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
4518 /* Finish up local dynamic symbol handling. We set the contents of
4519 various dynamic sections here. */
4522 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4524 struct elf_link_hash_entry
*h
4525 = (struct elf_link_hash_entry
*) *slot
;
4526 struct bfd_link_info
*info
4527 = (struct bfd_link_info
*) inf
;
4529 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4533 /* Used to decide how to sort relocs in an optimal manner for the
4534 dynamic linker, before writing them out. */
4536 static enum elf_reloc_type_class
4537 elf_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4539 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4541 case R_X86_64_RELATIVE
:
4542 case R_X86_64_RELATIVE64
:
4543 return reloc_class_relative
;
4544 case R_X86_64_JUMP_SLOT
:
4545 return reloc_class_plt
;
4547 return reloc_class_copy
;
4549 return reloc_class_normal
;
4553 /* Finish up the dynamic sections. */
4556 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4557 struct bfd_link_info
*info
)
4559 struct elf_x86_64_link_hash_table
*htab
;
4562 const struct elf_x86_64_backend_data
*const abed
4563 = get_elf_x86_64_backend_data (output_bfd
);
4565 htab
= elf_x86_64_hash_table (info
);
4569 dynobj
= htab
->elf
.dynobj
;
4570 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
4572 if (htab
->elf
.dynamic_sections_created
)
4574 bfd_byte
*dyncon
, *dynconend
;
4575 const struct elf_backend_data
*bed
;
4576 bfd_size_type sizeof_dyn
;
4578 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4581 bed
= get_elf_backend_data (dynobj
);
4582 sizeof_dyn
= bed
->s
->sizeof_dyn
;
4583 dyncon
= sdyn
->contents
;
4584 dynconend
= sdyn
->contents
+ sdyn
->size
;
4585 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
4587 Elf_Internal_Dyn dyn
;
4590 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
4598 s
= htab
->elf
.sgotplt
;
4599 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4603 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4607 s
= htab
->elf
.srelplt
->output_section
;
4608 dyn
.d_un
.d_val
= s
->size
;
4612 /* The procedure linkage table relocs (DT_JMPREL) should
4613 not be included in the overall relocs (DT_RELA).
4614 Therefore, we override the DT_RELASZ entry here to
4615 make it not include the JMPREL relocs. Since the
4616 linker script arranges for .rela.plt to follow all
4617 other relocation sections, we don't have to worry
4618 about changing the DT_RELA entry. */
4619 if (htab
->elf
.srelplt
!= NULL
)
4621 s
= htab
->elf
.srelplt
->output_section
;
4622 dyn
.d_un
.d_val
-= s
->size
;
4626 case DT_TLSDESC_PLT
:
4628 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4629 + htab
->tlsdesc_plt
;
4632 case DT_TLSDESC_GOT
:
4634 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4635 + htab
->tlsdesc_got
;
4639 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
4642 /* Fill in the special first entry in the procedure linkage table. */
4643 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4645 /* Fill in the first entry in the procedure linkage table. */
4646 memcpy (htab
->elf
.splt
->contents
,
4647 abed
->plt0_entry
, abed
->plt_entry_size
);
4648 /* Add offset for pushq GOT+8(%rip), since the instruction
4649 uses 6 bytes subtract this value. */
4650 bfd_put_32 (output_bfd
,
4651 (htab
->elf
.sgotplt
->output_section
->vma
4652 + htab
->elf
.sgotplt
->output_offset
4654 - htab
->elf
.splt
->output_section
->vma
4655 - htab
->elf
.splt
->output_offset
4657 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
4658 /* Add offset for the PC-relative instruction accessing GOT+16,
4659 subtracting the offset to the end of that instruction. */
4660 bfd_put_32 (output_bfd
,
4661 (htab
->elf
.sgotplt
->output_section
->vma
4662 + htab
->elf
.sgotplt
->output_offset
4664 - htab
->elf
.splt
->output_section
->vma
4665 - htab
->elf
.splt
->output_offset
4666 - abed
->plt0_got2_insn_end
),
4667 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
4669 elf_section_data (htab
->elf
.splt
->output_section
)
4670 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
4672 if (htab
->tlsdesc_plt
)
4674 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4675 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4677 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4678 abed
->plt0_entry
, abed
->plt_entry_size
);
4680 /* Add offset for pushq GOT+8(%rip), since the
4681 instruction uses 6 bytes subtract this value. */
4682 bfd_put_32 (output_bfd
,
4683 (htab
->elf
.sgotplt
->output_section
->vma
4684 + htab
->elf
.sgotplt
->output_offset
4686 - htab
->elf
.splt
->output_section
->vma
4687 - htab
->elf
.splt
->output_offset
4690 htab
->elf
.splt
->contents
4691 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
4692 /* Add offset for the PC-relative instruction accessing GOT+TDG,
4693 where TGD stands for htab->tlsdesc_got, subtracting the offset
4694 to the end of that instruction. */
4695 bfd_put_32 (output_bfd
,
4696 (htab
->elf
.sgot
->output_section
->vma
4697 + htab
->elf
.sgot
->output_offset
4699 - htab
->elf
.splt
->output_section
->vma
4700 - htab
->elf
.splt
->output_offset
4702 - abed
->plt0_got2_insn_end
),
4703 htab
->elf
.splt
->contents
4704 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
4709 if (htab
->elf
.sgotplt
)
4711 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4713 (*_bfd_error_handler
)
4714 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4718 /* Fill in the first three entries in the global offset table. */
4719 if (htab
->elf
.sgotplt
->size
> 0)
4721 /* Set the first entry in the global offset table to the address of
4722 the dynamic section. */
4724 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4726 bfd_put_64 (output_bfd
,
4727 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4728 htab
->elf
.sgotplt
->contents
);
4729 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4730 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4731 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4734 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4738 /* Adjust .eh_frame for .plt section. */
4739 if (htab
->plt_eh_frame
!= NULL
4740 && htab
->plt_eh_frame
->contents
!= NULL
)
4742 if (htab
->elf
.splt
!= NULL
4743 && htab
->elf
.splt
->size
!= 0
4744 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
4745 && htab
->elf
.splt
->output_section
!= NULL
4746 && htab
->plt_eh_frame
->output_section
!= NULL
)
4748 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
4749 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
4750 + htab
->plt_eh_frame
->output_offset
4751 + PLT_FDE_START_OFFSET
;
4752 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
4753 htab
->plt_eh_frame
->contents
4754 + PLT_FDE_START_OFFSET
);
4756 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
4758 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
4760 htab
->plt_eh_frame
->contents
))
4765 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4766 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4769 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4770 htab_traverse (htab
->loc_hash_table
,
4771 elf_x86_64_finish_local_dynamic_symbol
,
4777 /* Return address for Ith PLT stub in section PLT, for relocation REL
4778 or (bfd_vma) -1 if it should not be included. */
4781 elf_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4782 const arelent
*rel ATTRIBUTE_UNUSED
)
4784 return plt
->vma
+ (i
+ 1) * GET_PLT_ENTRY_SIZE (plt
->owner
);
4787 /* Handle an x86-64 specific section when reading an object file. This
4788 is called when elfcode.h finds a section with an unknown type. */
4791 elf_x86_64_section_from_shdr (bfd
*abfd
,
4792 Elf_Internal_Shdr
*hdr
,
4796 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4799 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4805 /* Hook called by the linker routine which adds symbols from an object
4806 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4810 elf_x86_64_add_symbol_hook (bfd
*abfd
,
4811 struct bfd_link_info
*info
,
4812 Elf_Internal_Sym
*sym
,
4813 const char **namep ATTRIBUTE_UNUSED
,
4814 flagword
*flagsp ATTRIBUTE_UNUSED
,
4820 switch (sym
->st_shndx
)
4822 case SHN_X86_64_LCOMMON
:
4823 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4826 lcomm
= bfd_make_section_with_flags (abfd
,
4830 | SEC_LINKER_CREATED
));
4833 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4836 *valp
= sym
->st_size
;
4840 if ((abfd
->flags
& DYNAMIC
) == 0
4841 && (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
4842 || ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
))
4843 elf_tdata (info
->output_bfd
)->has_gnu_symbols
= TRUE
;
4849 /* Given a BFD section, try to locate the corresponding ELF section
4853 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4854 asection
*sec
, int *index_return
)
4856 if (sec
== &_bfd_elf_large_com_section
)
4858 *index_return
= SHN_X86_64_LCOMMON
;
4864 /* Process a symbol. */
4867 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4870 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4872 switch (elfsym
->internal_elf_sym
.st_shndx
)
4874 case SHN_X86_64_LCOMMON
:
4875 asym
->section
= &_bfd_elf_large_com_section
;
4876 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4877 /* Common symbol doesn't set BSF_GLOBAL. */
4878 asym
->flags
&= ~BSF_GLOBAL
;
4884 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4886 return (sym
->st_shndx
== SHN_COMMON
4887 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4891 elf_x86_64_common_section_index (asection
*sec
)
4893 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4896 return SHN_X86_64_LCOMMON
;
4900 elf_x86_64_common_section (asection
*sec
)
4902 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4903 return bfd_com_section_ptr
;
4905 return &_bfd_elf_large_com_section
;
4909 elf_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4910 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4911 struct elf_link_hash_entry
*h
,
4912 Elf_Internal_Sym
*sym
,
4914 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4915 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4916 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4917 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4918 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4919 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4920 bfd_boolean
*newdyn ATTRIBUTE_UNUSED
,
4921 bfd_boolean
*newdef
,
4922 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4923 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4924 bfd
*abfd ATTRIBUTE_UNUSED
,
4926 bfd_boolean
*olddyn ATTRIBUTE_UNUSED
,
4927 bfd_boolean
*olddef
,
4928 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4929 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4933 /* A normal common symbol and a large common symbol result in a
4934 normal common symbol. We turn the large common symbol into a
4937 && h
->root
.type
== bfd_link_hash_common
4939 && bfd_is_com_section (*sec
)
4942 if (sym
->st_shndx
== SHN_COMMON
4943 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4945 h
->root
.u
.c
.p
->section
4946 = bfd_make_section_old_way (oldbfd
, "COMMON");
4947 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4949 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4950 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4951 *psec
= *sec
= bfd_com_section_ptr
;
4958 elf_x86_64_additional_program_headers (bfd
*abfd
,
4959 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4964 /* Check to see if we need a large readonly segment. */
4965 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4966 if (s
&& (s
->flags
& SEC_LOAD
))
4969 /* Check to see if we need a large data segment. Since .lbss sections
4970 is placed right after the .bss section, there should be no need for
4971 a large data segment just because of .lbss. */
4972 s
= bfd_get_section_by_name (abfd
, ".ldata");
4973 if (s
&& (s
->flags
& SEC_LOAD
))
4979 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4982 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4984 if (h
->plt
.offset
!= (bfd_vma
) -1
4986 && !h
->pointer_equality_needed
)
4989 return _bfd_elf_hash_symbol (h
);
4992 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4995 elf_x86_64_relocs_compatible (const bfd_target
*input
,
4996 const bfd_target
*output
)
4998 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
4999 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
5000 && _bfd_elf_relocs_compatible (input
, output
));
5003 static const struct bfd_elf_special_section
5004 elf_x86_64_special_sections
[]=
5006 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5007 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5008 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
5009 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5010 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5011 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5012 { NULL
, 0, 0, 0, 0 }
5015 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
5016 #define TARGET_LITTLE_NAME "elf64-x86-64"
5017 #define ELF_ARCH bfd_arch_i386
5018 #define ELF_TARGET_ID X86_64_ELF_DATA
5019 #define ELF_MACHINE_CODE EM_X86_64
5020 #define ELF_MAXPAGESIZE 0x200000
5021 #define ELF_MINPAGESIZE 0x1000
5022 #define ELF_COMMONPAGESIZE 0x1000
5024 #define elf_backend_can_gc_sections 1
5025 #define elf_backend_can_refcount 1
5026 #define elf_backend_want_got_plt 1
5027 #define elf_backend_plt_readonly 1
5028 #define elf_backend_want_plt_sym 0
5029 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5030 #define elf_backend_rela_normal 1
5031 #define elf_backend_plt_alignment 4
5033 #define elf_info_to_howto elf_x86_64_info_to_howto
5035 #define bfd_elf64_bfd_link_hash_table_create \
5036 elf_x86_64_link_hash_table_create
5037 #define bfd_elf64_bfd_link_hash_table_free \
5038 elf_x86_64_link_hash_table_free
5039 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5040 #define bfd_elf64_bfd_reloc_name_lookup \
5041 elf_x86_64_reloc_name_lookup
5043 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5044 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5045 #define elf_backend_check_relocs elf_x86_64_check_relocs
5046 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5047 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5048 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5049 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5050 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5051 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5052 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5053 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5055 #define elf_backend_write_core_note elf_x86_64_write_core_note
5057 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5058 #define elf_backend_relocate_section elf_x86_64_relocate_section
5059 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5060 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5061 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5062 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5063 #define elf_backend_object_p elf64_x86_64_elf_object_p
5064 #define bfd_elf64_mkobject elf_x86_64_mkobject
5066 #define elf_backend_section_from_shdr \
5067 elf_x86_64_section_from_shdr
5069 #define elf_backend_section_from_bfd_section \
5070 elf_x86_64_elf_section_from_bfd_section
5071 #define elf_backend_add_symbol_hook \
5072 elf_x86_64_add_symbol_hook
5073 #define elf_backend_symbol_processing \
5074 elf_x86_64_symbol_processing
5075 #define elf_backend_common_section_index \
5076 elf_x86_64_common_section_index
5077 #define elf_backend_common_section \
5078 elf_x86_64_common_section
5079 #define elf_backend_common_definition \
5080 elf_x86_64_common_definition
5081 #define elf_backend_merge_symbol \
5082 elf_x86_64_merge_symbol
5083 #define elf_backend_special_sections \
5084 elf_x86_64_special_sections
5085 #define elf_backend_additional_program_headers \
5086 elf_x86_64_additional_program_headers
5087 #define elf_backend_hash_symbol \
5088 elf_x86_64_hash_symbol
5090 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5092 #include "elf64-target.h"
5094 /* FreeBSD support. */
5096 #undef TARGET_LITTLE_SYM
5097 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
5098 #undef TARGET_LITTLE_NAME
5099 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5102 #define ELF_OSABI ELFOSABI_FREEBSD
5105 #define elf64_bed elf64_x86_64_fbsd_bed
5107 #include "elf64-target.h"
5109 /* Solaris 2 support. */
5111 #undef TARGET_LITTLE_SYM
5112 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
5113 #undef TARGET_LITTLE_NAME
5114 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5116 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5117 objects won't be recognized. */
5121 #define elf64_bed elf64_x86_64_sol2_bed
5123 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5125 #undef elf_backend_static_tls_alignment
5126 #define elf_backend_static_tls_alignment 16
5128 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5130 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5132 #undef elf_backend_want_plt_sym
5133 #define elf_backend_want_plt_sym 1
5135 #include "elf64-target.h"
5137 /* Native Client support. */
5139 #undef TARGET_LITTLE_SYM
5140 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec
5141 #undef TARGET_LITTLE_NAME
5142 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5144 #define elf64_bed elf64_x86_64_nacl_bed
5146 #undef ELF_MAXPAGESIZE
5147 #undef ELF_MINPAGESIZE
5148 #undef ELF_COMMONPAGESIZE
5149 #define ELF_MAXPAGESIZE 0x10000
5150 #define ELF_MINPAGESIZE 0x10000
5151 #define ELF_COMMONPAGESIZE 0x10000
5153 /* Restore defaults. */
5155 #undef elf_backend_static_tls_alignment
5156 #undef elf_backend_want_plt_sym
5157 #define elf_backend_want_plt_sym 0
5159 /* NaCl uses substantially different PLT entries for the same effects. */
5161 #undef elf_backend_plt_alignment
5162 #define elf_backend_plt_alignment 5
5163 #define NACL_PLT_ENTRY_SIZE 64
5164 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5166 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
5168 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5169 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5170 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
5171 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5172 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5174 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5175 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopl %cs:0x0(%rax,%rax,1) */
5177 /* 32 bytes of nop to pad out to the standard size. */
5178 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5179 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5180 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5181 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5182 0x66, /* excess data32 prefix */
5186 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
5188 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5189 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
5190 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5191 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5193 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5194 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5195 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5197 /* Lazy GOT entries point here (32-byte aligned). */
5198 0x68, /* pushq immediate */
5199 0, 0, 0, 0, /* replaced with index into relocation table. */
5200 0xe9, /* jmp relative */
5201 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5203 /* 22 bytes of nop to pad out to the standard size. */
5204 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5205 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5206 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5209 /* .eh_frame covering the .plt section. */
5211 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
5213 #if (PLT_CIE_LENGTH != 20 \
5214 || PLT_FDE_LENGTH != 36 \
5215 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5216 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5217 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5219 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
5220 0, 0, 0, 0, /* CIE ID */
5221 1, /* CIE version */
5222 'z', 'R', 0, /* Augmentation string */
5223 1, /* Code alignment factor */
5224 0x78, /* Data alignment factor */
5225 16, /* Return address column */
5226 1, /* Augmentation size */
5227 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
5228 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5229 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5230 DW_CFA_nop
, DW_CFA_nop
,
5232 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
5233 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
5234 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5235 0, 0, 0, 0, /* .plt size goes here */
5236 0, /* Augmentation size */
5237 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
5238 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5239 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
5240 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5241 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
5242 13, /* Block length */
5243 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
5244 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
5245 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
5246 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
5247 DW_CFA_nop
, DW_CFA_nop
5250 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
5252 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
5253 elf_x86_64_nacl_plt_entry
, /* plt_entry */
5254 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
5255 2, /* plt0_got1_offset */
5256 9, /* plt0_got2_offset */
5257 13, /* plt0_got2_insn_end */
5258 3, /* plt_got_offset */
5259 33, /* plt_reloc_offset */
5260 38, /* plt_plt_offset */
5261 7, /* plt_got_insn_size */
5262 42, /* plt_plt_insn_end */
5263 32, /* plt_lazy_offset */
5264 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
5265 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
5268 #undef elf_backend_arch_data
5269 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5271 #undef elf_backend_modify_segment_map
5272 #define elf_backend_modify_segment_map nacl_modify_segment_map
5273 #undef elf_backend_modify_program_headers
5274 #define elf_backend_modify_program_headers nacl_modify_program_headers
5276 #include "elf64-target.h"
5278 /* Native Client x32 support. */
5280 #undef TARGET_LITTLE_SYM
5281 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec
5282 #undef TARGET_LITTLE_NAME
5283 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5285 #define elf32_bed elf32_x86_64_nacl_bed
5287 #define bfd_elf32_bfd_link_hash_table_create \
5288 elf_x86_64_link_hash_table_create
5289 #define bfd_elf32_bfd_link_hash_table_free \
5290 elf_x86_64_link_hash_table_free
5291 #define bfd_elf32_bfd_reloc_type_lookup \
5292 elf_x86_64_reloc_type_lookup
5293 #define bfd_elf32_bfd_reloc_name_lookup \
5294 elf_x86_64_reloc_name_lookup
5295 #define bfd_elf32_mkobject \
5298 #undef elf_backend_object_p
5299 #define elf_backend_object_p \
5300 elf32_x86_64_elf_object_p
5302 #undef elf_backend_bfd_from_remote_memory
5303 #define elf_backend_bfd_from_remote_memory \
5304 _bfd_elf32_bfd_from_remote_memory
5306 #undef elf_backend_size_info
5307 #define elf_backend_size_info \
5308 _bfd_elf32_size_info
5310 #include "elf32-target.h"
5312 /* Restore defaults. */
5313 #undef elf_backend_object_p
5314 #define elf_backend_object_p elf64_x86_64_elf_object_p
5315 #undef elf_backend_bfd_from_remote_memory
5316 #undef elf_backend_size_info
5317 #undef elf_backend_modify_segment_map
5318 #undef elf_backend_modify_program_headers
5320 /* Intel L1OM support. */
5323 elf64_l1om_elf_object_p (bfd
*abfd
)
5325 /* Set the right machine number for an L1OM elf64 file. */
5326 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
5330 #undef TARGET_LITTLE_SYM
5331 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
5332 #undef TARGET_LITTLE_NAME
5333 #define TARGET_LITTLE_NAME "elf64-l1om"
5335 #define ELF_ARCH bfd_arch_l1om
5337 #undef ELF_MACHINE_CODE
5338 #define ELF_MACHINE_CODE EM_L1OM
5343 #define elf64_bed elf64_l1om_bed
5345 #undef elf_backend_object_p
5346 #define elf_backend_object_p elf64_l1om_elf_object_p
5348 /* Restore defaults. */
5349 #undef ELF_MAXPAGESIZE
5350 #undef ELF_MINPAGESIZE
5351 #undef ELF_COMMONPAGESIZE
5352 #define ELF_MAXPAGESIZE 0x200000
5353 #define ELF_MINPAGESIZE 0x1000
5354 #define ELF_COMMONPAGESIZE 0x1000
5355 #undef elf_backend_plt_alignment
5356 #define elf_backend_plt_alignment 4
5357 #undef elf_backend_arch_data
5358 #define elf_backend_arch_data &elf_x86_64_arch_bed
5360 #include "elf64-target.h"
5362 /* FreeBSD L1OM support. */
5364 #undef TARGET_LITTLE_SYM
5365 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
5366 #undef TARGET_LITTLE_NAME
5367 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5370 #define ELF_OSABI ELFOSABI_FREEBSD
5373 #define elf64_bed elf64_l1om_fbsd_bed
5375 #include "elf64-target.h"
5377 /* Intel K1OM support. */
5380 elf64_k1om_elf_object_p (bfd
*abfd
)
5382 /* Set the right machine number for an K1OM elf64 file. */
5383 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
5387 #undef TARGET_LITTLE_SYM
5388 #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec
5389 #undef TARGET_LITTLE_NAME
5390 #define TARGET_LITTLE_NAME "elf64-k1om"
5392 #define ELF_ARCH bfd_arch_k1om
5394 #undef ELF_MACHINE_CODE
5395 #define ELF_MACHINE_CODE EM_K1OM
5400 #define elf64_bed elf64_k1om_bed
5402 #undef elf_backend_object_p
5403 #define elf_backend_object_p elf64_k1om_elf_object_p
5405 #undef elf_backend_static_tls_alignment
5407 #undef elf_backend_want_plt_sym
5408 #define elf_backend_want_plt_sym 0
5410 #include "elf64-target.h"
5412 /* FreeBSD K1OM support. */
5414 #undef TARGET_LITTLE_SYM
5415 #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec
5416 #undef TARGET_LITTLE_NAME
5417 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5420 #define ELF_OSABI ELFOSABI_FREEBSD
5423 #define elf64_bed elf64_k1om_fbsd_bed
5425 #include "elf64-target.h"
5427 /* 32bit x86-64 support. */
5429 #undef TARGET_LITTLE_SYM
5430 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
5431 #undef TARGET_LITTLE_NAME
5432 #define TARGET_LITTLE_NAME "elf32-x86-64"
5436 #define ELF_ARCH bfd_arch_i386
5438 #undef ELF_MACHINE_CODE
5439 #define ELF_MACHINE_CODE EM_X86_64
5443 #undef elf_backend_object_p
5444 #define elf_backend_object_p \
5445 elf32_x86_64_elf_object_p
5447 #undef elf_backend_bfd_from_remote_memory
5448 #define elf_backend_bfd_from_remote_memory \
5449 _bfd_elf32_bfd_from_remote_memory
5451 #undef elf_backend_size_info
5452 #define elf_backend_size_info \
5453 _bfd_elf32_size_info
5455 #include "elf32-target.h"