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_section_by_name (dynobj
, ".dynbss");
975 htab
->srelbss
= bfd_get_section_by_name (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
= get_elf_backend_data (dynobj
)->dynamic_sec_flags
;
987 = bfd_make_section_anyway_with_flags (dynobj
, ".eh_frame",
991 if (htab
->plt_eh_frame
== NULL
992 || !bfd_set_section_alignment (dynobj
, htab
->plt_eh_frame
, 3))
998 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1001 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
1002 struct elf_link_hash_entry
*dir
,
1003 struct elf_link_hash_entry
*ind
)
1005 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
1007 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
1008 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
1010 if (eind
->dyn_relocs
!= NULL
)
1012 if (edir
->dyn_relocs
!= NULL
)
1014 struct elf_dyn_relocs
**pp
;
1015 struct elf_dyn_relocs
*p
;
1017 /* Add reloc counts against the indirect sym to the direct sym
1018 list. Merge any entries against the same section. */
1019 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1021 struct elf_dyn_relocs
*q
;
1023 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1024 if (q
->sec
== p
->sec
)
1026 q
->pc_count
+= p
->pc_count
;
1027 q
->count
+= p
->count
;
1034 *pp
= edir
->dyn_relocs
;
1037 edir
->dyn_relocs
= eind
->dyn_relocs
;
1038 eind
->dyn_relocs
= NULL
;
1041 if (ind
->root
.type
== bfd_link_hash_indirect
1042 && dir
->got
.refcount
<= 0)
1044 edir
->tls_type
= eind
->tls_type
;
1045 eind
->tls_type
= GOT_UNKNOWN
;
1048 if (ELIMINATE_COPY_RELOCS
1049 && ind
->root
.type
!= bfd_link_hash_indirect
1050 && dir
->dynamic_adjusted
)
1052 /* If called to transfer flags for a weakdef during processing
1053 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1054 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1055 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1056 dir
->ref_regular
|= ind
->ref_regular
;
1057 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1058 dir
->needs_plt
|= ind
->needs_plt
;
1059 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1062 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1066 elf64_x86_64_elf_object_p (bfd
*abfd
)
1068 /* Set the right machine number for an x86-64 elf64 file. */
1069 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
1074 elf32_x86_64_elf_object_p (bfd
*abfd
)
1076 /* Set the right machine number for an x86-64 elf32 file. */
1077 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
1081 /* Return TRUE if the TLS access code sequence support transition
1085 elf_x86_64_check_tls_transition (bfd
*abfd
,
1086 struct bfd_link_info
*info
,
1089 Elf_Internal_Shdr
*symtab_hdr
,
1090 struct elf_link_hash_entry
**sym_hashes
,
1091 unsigned int r_type
,
1092 const Elf_Internal_Rela
*rel
,
1093 const Elf_Internal_Rela
*relend
)
1096 unsigned long r_symndx
;
1097 struct elf_link_hash_entry
*h
;
1099 struct elf_x86_64_link_hash_table
*htab
;
1101 /* Get the section contents. */
1102 if (contents
== NULL
)
1104 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1105 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1108 /* FIXME: How to better handle error condition? */
1109 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1112 /* Cache the section contents for elf_link_input_bfd. */
1113 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1117 htab
= elf_x86_64_hash_table (info
);
1118 offset
= rel
->r_offset
;
1121 case R_X86_64_TLSGD
:
1122 case R_X86_64_TLSLD
:
1123 if ((rel
+ 1) >= relend
)
1126 if (r_type
== R_X86_64_TLSGD
)
1128 /* Check transition from GD access model. For 64bit, only
1129 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1130 .word 0x6666; rex64; call __tls_get_addr
1131 can transit to different access model. For 32bit, only
1132 leaq foo@tlsgd(%rip), %rdi
1133 .word 0x6666; rex64; call __tls_get_addr
1134 can transit to different access model. */
1136 static const unsigned char call
[] = { 0x66, 0x66, 0x48, 0xe8 };
1137 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1139 if ((offset
+ 12) > sec
->size
1140 || memcmp (contents
+ offset
+ 4, call
, 4) != 0)
1143 if (ABI_64_P (abfd
))
1146 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1152 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1158 /* Check transition from LD access model. Only
1159 leaq foo@tlsld(%rip), %rdi;
1161 can transit to different access model. */
1163 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1165 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1168 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0
1169 || 0xe8 != *(contents
+ offset
+ 4))
1173 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1174 if (r_symndx
< symtab_hdr
->sh_info
)
1177 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1178 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1179 may be versioned. */
1181 && h
->root
.root
.string
!= NULL
1182 && (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
1183 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
1184 && (strncmp (h
->root
.root
.string
,
1185 "__tls_get_addr", 14) == 0));
1187 case R_X86_64_GOTTPOFF
:
1188 /* Check transition from IE access model:
1189 mov foo@gottpoff(%rip), %reg
1190 add foo@gottpoff(%rip), %reg
1193 /* Check REX prefix first. */
1194 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1196 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1197 if (val
!= 0x48 && val
!= 0x4c)
1199 /* X32 may have 0x44 REX prefix or no REX prefix. */
1200 if (ABI_64_P (abfd
))
1206 /* X32 may not have any REX prefix. */
1207 if (ABI_64_P (abfd
))
1209 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1213 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1214 if (val
!= 0x8b && val
!= 0x03)
1217 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1218 return (val
& 0xc7) == 5;
1220 case R_X86_64_GOTPC32_TLSDESC
:
1221 /* Check transition from GDesc access model:
1222 leaq x@tlsdesc(%rip), %rax
1224 Make sure it's a leaq adding rip to a 32-bit offset
1225 into any register, although it's probably almost always
1228 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1231 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1232 if ((val
& 0xfb) != 0x48)
1235 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1238 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1239 return (val
& 0xc7) == 0x05;
1241 case R_X86_64_TLSDESC_CALL
:
1242 /* Check transition from GDesc access model:
1243 call *x@tlsdesc(%rax)
1245 if (offset
+ 2 <= sec
->size
)
1247 /* Make sure that it's a call *x@tlsdesc(%rax). */
1248 static const unsigned char call
[] = { 0xff, 0x10 };
1249 return memcmp (contents
+ offset
, call
, 2) == 0;
1259 /* Return TRUE if the TLS access transition is OK or no transition
1260 will be performed. Update R_TYPE if there is a transition. */
1263 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1264 asection
*sec
, bfd_byte
*contents
,
1265 Elf_Internal_Shdr
*symtab_hdr
,
1266 struct elf_link_hash_entry
**sym_hashes
,
1267 unsigned int *r_type
, int tls_type
,
1268 const Elf_Internal_Rela
*rel
,
1269 const Elf_Internal_Rela
*relend
,
1270 struct elf_link_hash_entry
*h
,
1271 unsigned long r_symndx
)
1273 unsigned int from_type
= *r_type
;
1274 unsigned int to_type
= from_type
;
1275 bfd_boolean check
= TRUE
;
1277 /* Skip TLS transition for functions. */
1279 && (h
->type
== STT_FUNC
1280 || h
->type
== STT_GNU_IFUNC
))
1285 case R_X86_64_TLSGD
:
1286 case R_X86_64_GOTPC32_TLSDESC
:
1287 case R_X86_64_TLSDESC_CALL
:
1288 case R_X86_64_GOTTPOFF
:
1289 if (info
->executable
)
1292 to_type
= R_X86_64_TPOFF32
;
1294 to_type
= R_X86_64_GOTTPOFF
;
1297 /* When we are called from elf_x86_64_relocate_section,
1298 CONTENTS isn't NULL and there may be additional transitions
1299 based on TLS_TYPE. */
1300 if (contents
!= NULL
)
1302 unsigned int new_to_type
= to_type
;
1304 if (info
->executable
1307 && tls_type
== GOT_TLS_IE
)
1308 new_to_type
= R_X86_64_TPOFF32
;
1310 if (to_type
== R_X86_64_TLSGD
1311 || to_type
== R_X86_64_GOTPC32_TLSDESC
1312 || to_type
== R_X86_64_TLSDESC_CALL
)
1314 if (tls_type
== GOT_TLS_IE
)
1315 new_to_type
= R_X86_64_GOTTPOFF
;
1318 /* We checked the transition before when we were called from
1319 elf_x86_64_check_relocs. We only want to check the new
1320 transition which hasn't been checked before. */
1321 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1322 to_type
= new_to_type
;
1327 case R_X86_64_TLSLD
:
1328 if (info
->executable
)
1329 to_type
= R_X86_64_TPOFF32
;
1336 /* Return TRUE if there is no transition. */
1337 if (from_type
== to_type
)
1340 /* Check if the transition can be performed. */
1342 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1343 symtab_hdr
, sym_hashes
,
1344 from_type
, rel
, relend
))
1346 reloc_howto_type
*from
, *to
;
1349 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1350 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1353 name
= h
->root
.root
.string
;
1356 struct elf_x86_64_link_hash_table
*htab
;
1358 htab
= elf_x86_64_hash_table (info
);
1363 Elf_Internal_Sym
*isym
;
1365 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1367 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1371 (*_bfd_error_handler
)
1372 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1373 "in section `%A' failed"),
1374 abfd
, sec
, from
->name
, to
->name
, name
,
1375 (unsigned long) rel
->r_offset
);
1376 bfd_set_error (bfd_error_bad_value
);
1384 /* Look through the relocs for a section during the first phase, and
1385 calculate needed space in the global offset table, procedure
1386 linkage table, and dynamic reloc sections. */
1389 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1391 const Elf_Internal_Rela
*relocs
)
1393 struct elf_x86_64_link_hash_table
*htab
;
1394 Elf_Internal_Shdr
*symtab_hdr
;
1395 struct elf_link_hash_entry
**sym_hashes
;
1396 const Elf_Internal_Rela
*rel
;
1397 const Elf_Internal_Rela
*rel_end
;
1400 if (info
->relocatable
)
1403 BFD_ASSERT (is_x86_64_elf (abfd
));
1405 htab
= elf_x86_64_hash_table (info
);
1409 symtab_hdr
= &elf_symtab_hdr (abfd
);
1410 sym_hashes
= elf_sym_hashes (abfd
);
1414 rel_end
= relocs
+ sec
->reloc_count
;
1415 for (rel
= relocs
; rel
< rel_end
; rel
++)
1417 unsigned int r_type
;
1418 unsigned long r_symndx
;
1419 struct elf_link_hash_entry
*h
;
1420 Elf_Internal_Sym
*isym
;
1423 r_symndx
= htab
->r_sym (rel
->r_info
);
1424 r_type
= ELF32_R_TYPE (rel
->r_info
);
1426 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1428 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1433 if (r_symndx
< symtab_hdr
->sh_info
)
1435 /* A local symbol. */
1436 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1441 /* Check relocation against local STT_GNU_IFUNC symbol. */
1442 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1444 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1449 /* Fake a STT_GNU_IFUNC symbol. */
1450 h
->type
= STT_GNU_IFUNC
;
1453 h
->forced_local
= 1;
1454 h
->root
.type
= bfd_link_hash_defined
;
1462 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1463 while (h
->root
.type
== bfd_link_hash_indirect
1464 || h
->root
.type
== bfd_link_hash_warning
)
1465 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1468 /* Check invalid x32 relocations. */
1469 if (!ABI_64_P (abfd
))
1475 case R_X86_64_DTPOFF64
:
1476 case R_X86_64_TPOFF64
:
1478 case R_X86_64_GOTOFF64
:
1479 case R_X86_64_GOT64
:
1480 case R_X86_64_GOTPCREL64
:
1481 case R_X86_64_GOTPC64
:
1482 case R_X86_64_GOTPLT64
:
1483 case R_X86_64_PLTOFF64
:
1486 name
= h
->root
.root
.string
;
1488 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1490 (*_bfd_error_handler
)
1491 (_("%B: relocation %s against symbol `%s' isn't "
1492 "supported in x32 mode"), abfd
,
1493 x86_64_elf_howto_table
[r_type
].name
, name
);
1494 bfd_set_error (bfd_error_bad_value
);
1502 /* Create the ifunc sections for static executables. If we
1503 never see an indirect function symbol nor we are building
1504 a static executable, those sections will be empty and
1505 won't appear in output. */
1516 case R_X86_64_PLT32
:
1517 case R_X86_64_GOTPCREL
:
1518 case R_X86_64_GOTPCREL64
:
1519 if (htab
->elf
.dynobj
== NULL
)
1520 htab
->elf
.dynobj
= abfd
;
1521 if (!_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
1526 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1527 it here if it is defined in a non-shared object. */
1528 if (h
->type
== STT_GNU_IFUNC
1531 /* It is referenced by a non-shared object. */
1535 /* STT_GNU_IFUNC symbol must go through PLT. */
1536 h
->plt
.refcount
+= 1;
1538 /* STT_GNU_IFUNC needs dynamic sections. */
1539 if (htab
->elf
.dynobj
== NULL
)
1540 htab
->elf
.dynobj
= abfd
;
1545 if (h
->root
.root
.string
)
1546 name
= h
->root
.root
.string
;
1548 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1550 (*_bfd_error_handler
)
1551 (_("%B: relocation %s against STT_GNU_IFUNC "
1552 "symbol `%s' isn't handled by %s"), abfd
,
1553 x86_64_elf_howto_table
[r_type
].name
,
1554 name
, __FUNCTION__
);
1555 bfd_set_error (bfd_error_bad_value
);
1559 if (ABI_64_P (abfd
))
1563 h
->pointer_equality_needed
= 1;
1566 /* We must copy these reloc types into the output
1567 file. Create a reloc section in dynobj and
1568 make room for this reloc. */
1569 sreloc
= _bfd_elf_create_ifunc_dyn_reloc
1570 (abfd
, info
, sec
, sreloc
,
1571 &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
);
1582 if (r_type
!= R_X86_64_PC32
1583 && r_type
!= R_X86_64_PC64
)
1584 h
->pointer_equality_needed
= 1;
1587 case R_X86_64_PLT32
:
1590 case R_X86_64_GOTPCREL
:
1591 case R_X86_64_GOTPCREL64
:
1592 h
->got
.refcount
+= 1;
1593 if (htab
->elf
.sgot
== NULL
1594 && !_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1604 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1605 symtab_hdr
, sym_hashes
,
1606 &r_type
, GOT_UNKNOWN
,
1607 rel
, rel_end
, h
, r_symndx
))
1612 case R_X86_64_TLSLD
:
1613 htab
->tls_ld_got
.refcount
+= 1;
1616 case R_X86_64_TPOFF32
:
1617 if (!info
->executable
&& ABI_64_P (abfd
))
1620 name
= h
->root
.root
.string
;
1622 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1624 (*_bfd_error_handler
)
1625 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1627 x86_64_elf_howto_table
[r_type
].name
, name
);
1628 bfd_set_error (bfd_error_bad_value
);
1633 case R_X86_64_GOTTPOFF
:
1634 if (!info
->executable
)
1635 info
->flags
|= DF_STATIC_TLS
;
1638 case R_X86_64_GOT32
:
1639 case R_X86_64_GOTPCREL
:
1640 case R_X86_64_TLSGD
:
1641 case R_X86_64_GOT64
:
1642 case R_X86_64_GOTPCREL64
:
1643 case R_X86_64_GOTPLT64
:
1644 case R_X86_64_GOTPC32_TLSDESC
:
1645 case R_X86_64_TLSDESC_CALL
:
1646 /* This symbol requires a global offset table entry. */
1648 int tls_type
, old_tls_type
;
1652 default: tls_type
= GOT_NORMAL
; break;
1653 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1654 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1655 case R_X86_64_GOTPC32_TLSDESC
:
1656 case R_X86_64_TLSDESC_CALL
:
1657 tls_type
= GOT_TLS_GDESC
; break;
1662 if (r_type
== R_X86_64_GOTPLT64
)
1664 /* This relocation indicates that we also need
1665 a PLT entry, as this is a function. We don't need
1666 a PLT entry for local symbols. */
1668 h
->plt
.refcount
+= 1;
1670 h
->got
.refcount
+= 1;
1671 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1675 bfd_signed_vma
*local_got_refcounts
;
1677 /* This is a global offset table entry for a local symbol. */
1678 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1679 if (local_got_refcounts
== NULL
)
1683 size
= symtab_hdr
->sh_info
;
1684 size
*= sizeof (bfd_signed_vma
)
1685 + sizeof (bfd_vma
) + sizeof (char);
1686 local_got_refcounts
= ((bfd_signed_vma
*)
1687 bfd_zalloc (abfd
, size
));
1688 if (local_got_refcounts
== NULL
)
1690 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1691 elf_x86_64_local_tlsdesc_gotent (abfd
)
1692 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1693 elf_x86_64_local_got_tls_type (abfd
)
1694 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1696 local_got_refcounts
[r_symndx
] += 1;
1698 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1701 /* If a TLS symbol is accessed using IE at least once,
1702 there is no point to use dynamic model for it. */
1703 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1704 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1705 || tls_type
!= GOT_TLS_IE
))
1707 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1708 tls_type
= old_tls_type
;
1709 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1710 && GOT_TLS_GD_ANY_P (tls_type
))
1711 tls_type
|= old_tls_type
;
1715 name
= h
->root
.root
.string
;
1717 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1719 (*_bfd_error_handler
)
1720 (_("%B: '%s' accessed both as normal and thread local symbol"),
1726 if (old_tls_type
!= tls_type
)
1729 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1731 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1736 case R_X86_64_GOTOFF64
:
1737 case R_X86_64_GOTPC32
:
1738 case R_X86_64_GOTPC64
:
1740 if (htab
->elf
.sgot
== NULL
)
1742 if (htab
->elf
.dynobj
== NULL
)
1743 htab
->elf
.dynobj
= abfd
;
1744 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1750 case R_X86_64_PLT32
:
1751 /* This symbol requires a procedure linkage table entry. We
1752 actually build the entry in adjust_dynamic_symbol,
1753 because this might be a case of linking PIC code which is
1754 never referenced by a dynamic object, in which case we
1755 don't need to generate a procedure linkage table entry
1758 /* If this is a local symbol, we resolve it directly without
1759 creating a procedure linkage table entry. */
1764 h
->plt
.refcount
+= 1;
1767 case R_X86_64_PLTOFF64
:
1768 /* This tries to form the 'address' of a function relative
1769 to GOT. For global symbols we need a PLT entry. */
1773 h
->plt
.refcount
+= 1;
1778 if (!ABI_64_P (abfd
))
1783 /* Let's help debug shared library creation. These relocs
1784 cannot be used in shared libs. Don't error out for
1785 sections we don't care about, such as debug sections or
1786 non-constant sections. */
1788 && (sec
->flags
& SEC_ALLOC
) != 0
1789 && (sec
->flags
& SEC_READONLY
) != 0)
1792 name
= h
->root
.root
.string
;
1794 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1795 (*_bfd_error_handler
)
1796 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1797 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1798 bfd_set_error (bfd_error_bad_value
);
1809 if (h
!= NULL
&& info
->executable
)
1811 /* If this reloc is in a read-only section, we might
1812 need a copy reloc. We can't check reliably at this
1813 stage whether the section is read-only, as input
1814 sections have not yet been mapped to output sections.
1815 Tentatively set the flag for now, and correct in
1816 adjust_dynamic_symbol. */
1819 /* We may need a .plt entry if the function this reloc
1820 refers to is in a shared lib. */
1821 h
->plt
.refcount
+= 1;
1822 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1823 h
->pointer_equality_needed
= 1;
1826 /* If we are creating a shared library, and this is a reloc
1827 against a global symbol, or a non PC relative reloc
1828 against a local symbol, then we need to copy the reloc
1829 into the shared library. However, if we are linking with
1830 -Bsymbolic, we do not need to copy a reloc against a
1831 global symbol which is defined in an object we are
1832 including in the link (i.e., DEF_REGULAR is set). At
1833 this point we have not seen all the input files, so it is
1834 possible that DEF_REGULAR is not set now but will be set
1835 later (it is never cleared). In case of a weak definition,
1836 DEF_REGULAR may be cleared later by a strong definition in
1837 a shared library. We account for that possibility below by
1838 storing information in the relocs_copied field of the hash
1839 table entry. A similar situation occurs when creating
1840 shared libraries and symbol visibility changes render the
1843 If on the other hand, we are creating an executable, we
1844 may need to keep relocations for symbols satisfied by a
1845 dynamic library if we manage to avoid copy relocs for the
1848 && (sec
->flags
& SEC_ALLOC
) != 0
1849 && (! IS_X86_64_PCREL_TYPE (r_type
)
1851 && (! SYMBOLIC_BIND (info
, h
)
1852 || h
->root
.type
== bfd_link_hash_defweak
1853 || !h
->def_regular
))))
1854 || (ELIMINATE_COPY_RELOCS
1856 && (sec
->flags
& SEC_ALLOC
) != 0
1858 && (h
->root
.type
== bfd_link_hash_defweak
1859 || !h
->def_regular
)))
1861 struct elf_dyn_relocs
*p
;
1862 struct elf_dyn_relocs
**head
;
1864 /* We must copy these reloc types into the output file.
1865 Create a reloc section in dynobj and make room for
1869 if (htab
->elf
.dynobj
== NULL
)
1870 htab
->elf
.dynobj
= abfd
;
1872 sreloc
= _bfd_elf_make_dynamic_reloc_section
1873 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
1874 abfd
, /*rela?*/ TRUE
);
1880 /* If this is a global symbol, we count the number of
1881 relocations we need for this symbol. */
1884 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1888 /* Track dynamic relocs needed for local syms too.
1889 We really need local syms available to do this
1894 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1899 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1903 /* Beware of type punned pointers vs strict aliasing
1905 vpp
= &(elf_section_data (s
)->local_dynrel
);
1906 head
= (struct elf_dyn_relocs
**)vpp
;
1910 if (p
== NULL
|| p
->sec
!= sec
)
1912 bfd_size_type amt
= sizeof *p
;
1914 p
= ((struct elf_dyn_relocs
*)
1915 bfd_alloc (htab
->elf
.dynobj
, amt
));
1926 if (IS_X86_64_PCREL_TYPE (r_type
))
1931 /* This relocation describes the C++ object vtable hierarchy.
1932 Reconstruct it for later use during GC. */
1933 case R_X86_64_GNU_VTINHERIT
:
1934 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1938 /* This relocation describes which C++ vtable entries are actually
1939 used. Record for later use during GC. */
1940 case R_X86_64_GNU_VTENTRY
:
1941 BFD_ASSERT (h
!= NULL
);
1943 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1955 /* Return the section that should be marked against GC for a given
1959 elf_x86_64_gc_mark_hook (asection
*sec
,
1960 struct bfd_link_info
*info
,
1961 Elf_Internal_Rela
*rel
,
1962 struct elf_link_hash_entry
*h
,
1963 Elf_Internal_Sym
*sym
)
1966 switch (ELF32_R_TYPE (rel
->r_info
))
1968 case R_X86_64_GNU_VTINHERIT
:
1969 case R_X86_64_GNU_VTENTRY
:
1973 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1976 /* Update the got entry reference counts for the section being removed. */
1979 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1981 const Elf_Internal_Rela
*relocs
)
1983 struct elf_x86_64_link_hash_table
*htab
;
1984 Elf_Internal_Shdr
*symtab_hdr
;
1985 struct elf_link_hash_entry
**sym_hashes
;
1986 bfd_signed_vma
*local_got_refcounts
;
1987 const Elf_Internal_Rela
*rel
, *relend
;
1989 if (info
->relocatable
)
1992 htab
= elf_x86_64_hash_table (info
);
1996 elf_section_data (sec
)->local_dynrel
= NULL
;
1998 symtab_hdr
= &elf_symtab_hdr (abfd
);
1999 sym_hashes
= elf_sym_hashes (abfd
);
2000 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2002 htab
= elf_x86_64_hash_table (info
);
2003 relend
= relocs
+ sec
->reloc_count
;
2004 for (rel
= relocs
; rel
< relend
; rel
++)
2006 unsigned long r_symndx
;
2007 unsigned int r_type
;
2008 struct elf_link_hash_entry
*h
= NULL
;
2010 r_symndx
= htab
->r_sym (rel
->r_info
);
2011 if (r_symndx
>= symtab_hdr
->sh_info
)
2013 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2014 while (h
->root
.type
== bfd_link_hash_indirect
2015 || h
->root
.type
== bfd_link_hash_warning
)
2016 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2020 /* A local symbol. */
2021 Elf_Internal_Sym
*isym
;
2023 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
2026 /* Check relocation against local STT_GNU_IFUNC symbol. */
2028 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
2030 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
2038 struct elf_x86_64_link_hash_entry
*eh
;
2039 struct elf_dyn_relocs
**pp
;
2040 struct elf_dyn_relocs
*p
;
2042 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2044 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
2047 /* Everything must go for SEC. */
2053 r_type
= ELF32_R_TYPE (rel
->r_info
);
2054 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
2055 symtab_hdr
, sym_hashes
,
2056 &r_type
, GOT_UNKNOWN
,
2057 rel
, relend
, h
, r_symndx
))
2062 case R_X86_64_TLSLD
:
2063 if (htab
->tls_ld_got
.refcount
> 0)
2064 htab
->tls_ld_got
.refcount
-= 1;
2067 case R_X86_64_TLSGD
:
2068 case R_X86_64_GOTPC32_TLSDESC
:
2069 case R_X86_64_TLSDESC_CALL
:
2070 case R_X86_64_GOTTPOFF
:
2071 case R_X86_64_GOT32
:
2072 case R_X86_64_GOTPCREL
:
2073 case R_X86_64_GOT64
:
2074 case R_X86_64_GOTPCREL64
:
2075 case R_X86_64_GOTPLT64
:
2078 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
2079 h
->plt
.refcount
-= 1;
2080 if (h
->got
.refcount
> 0)
2081 h
->got
.refcount
-= 1;
2082 if (h
->type
== STT_GNU_IFUNC
)
2084 if (h
->plt
.refcount
> 0)
2085 h
->plt
.refcount
-= 1;
2088 else if (local_got_refcounts
!= NULL
)
2090 if (local_got_refcounts
[r_symndx
] > 0)
2091 local_got_refcounts
[r_symndx
] -= 1;
2105 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
2109 case R_X86_64_PLT32
:
2110 case R_X86_64_PLTOFF64
:
2113 if (h
->plt
.refcount
> 0)
2114 h
->plt
.refcount
-= 1;
2126 /* Adjust a symbol defined by a dynamic object and referenced by a
2127 regular object. The current definition is in some section of the
2128 dynamic object, but we're not including those sections. We have to
2129 change the definition to something the rest of the link can
2133 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
2134 struct elf_link_hash_entry
*h
)
2136 struct elf_x86_64_link_hash_table
*htab
;
2139 /* STT_GNU_IFUNC symbol must go through PLT. */
2140 if (h
->type
== STT_GNU_IFUNC
)
2142 if (h
->plt
.refcount
<= 0)
2144 h
->plt
.offset
= (bfd_vma
) -1;
2150 /* If this is a function, put it in the procedure linkage table. We
2151 will fill in the contents of the procedure linkage table later,
2152 when we know the address of the .got section. */
2153 if (h
->type
== STT_FUNC
2156 if (h
->plt
.refcount
<= 0
2157 || SYMBOL_CALLS_LOCAL (info
, h
)
2158 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2159 && h
->root
.type
== bfd_link_hash_undefweak
))
2161 /* This case can occur if we saw a PLT32 reloc in an input
2162 file, but the symbol was never referred to by a dynamic
2163 object, or if all references were garbage collected. In
2164 such a case, we don't actually need to build a procedure
2165 linkage table, and we can just do a PC32 reloc instead. */
2166 h
->plt
.offset
= (bfd_vma
) -1;
2173 /* It's possible that we incorrectly decided a .plt reloc was
2174 needed for an R_X86_64_PC32 reloc to a non-function sym in
2175 check_relocs. We can't decide accurately between function and
2176 non-function syms in check-relocs; Objects loaded later in
2177 the link may change h->type. So fix it now. */
2178 h
->plt
.offset
= (bfd_vma
) -1;
2180 /* If this is a weak symbol, and there is a real definition, the
2181 processor independent code will have arranged for us to see the
2182 real definition first, and we can just use the same value. */
2183 if (h
->u
.weakdef
!= NULL
)
2185 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2186 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2187 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2188 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2189 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2190 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2194 /* This is a reference to a symbol defined by a dynamic object which
2195 is not a function. */
2197 /* If we are creating a shared library, we must presume that the
2198 only references to the symbol are via the global offset table.
2199 For such cases we need not do anything here; the relocations will
2200 be handled correctly by relocate_section. */
2204 /* If there are no references to this symbol that do not use the
2205 GOT, we don't need to generate a copy reloc. */
2206 if (!h
->non_got_ref
)
2209 /* If -z nocopyreloc was given, we won't generate them either. */
2210 if (info
->nocopyreloc
)
2216 if (ELIMINATE_COPY_RELOCS
)
2218 struct elf_x86_64_link_hash_entry
* eh
;
2219 struct elf_dyn_relocs
*p
;
2221 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2222 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2224 s
= p
->sec
->output_section
;
2225 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2229 /* If we didn't find any dynamic relocs in read-only sections, then
2230 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2238 /* We must allocate the symbol in our .dynbss section, which will
2239 become part of the .bss section of the executable. There will be
2240 an entry for this symbol in the .dynsym section. The dynamic
2241 object will contain position independent code, so all references
2242 from the dynamic object to this symbol will go through the global
2243 offset table. The dynamic linker will use the .dynsym entry to
2244 determine the address it must put in the global offset table, so
2245 both the dynamic object and the regular object will refer to the
2246 same memory location for the variable. */
2248 htab
= elf_x86_64_hash_table (info
);
2252 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2253 to copy the initial value out of the dynamic object and into the
2254 runtime process image. */
2255 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
2257 const struct elf_backend_data
*bed
;
2258 bed
= get_elf_backend_data (info
->output_bfd
);
2259 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2265 return _bfd_elf_adjust_dynamic_copy (h
, s
);
2268 /* Allocate space in .plt, .got and associated reloc sections for
2272 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2274 struct bfd_link_info
*info
;
2275 struct elf_x86_64_link_hash_table
*htab
;
2276 struct elf_x86_64_link_hash_entry
*eh
;
2277 struct elf_dyn_relocs
*p
;
2278 const struct elf_backend_data
*bed
;
2279 unsigned int plt_entry_size
;
2281 if (h
->root
.type
== bfd_link_hash_indirect
)
2284 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2286 info
= (struct bfd_link_info
*) inf
;
2287 htab
= elf_x86_64_hash_table (info
);
2290 bed
= get_elf_backend_data (info
->output_bfd
);
2291 plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
2293 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2294 here if it is defined and referenced in a non-shared object. */
2295 if (h
->type
== STT_GNU_IFUNC
2297 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2301 else if (htab
->elf
.dynamic_sections_created
2302 && h
->plt
.refcount
> 0)
2304 /* Make sure this symbol is output as a dynamic symbol.
2305 Undefined weak syms won't yet be marked as dynamic. */
2306 if (h
->dynindx
== -1
2307 && !h
->forced_local
)
2309 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2314 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2316 asection
*s
= htab
->elf
.splt
;
2318 /* If this is the first .plt entry, make room for the special
2321 s
->size
+= plt_entry_size
;
2323 h
->plt
.offset
= s
->size
;
2325 /* If this symbol is not defined in a regular file, and we are
2326 not generating a shared library, then set the symbol to this
2327 location in the .plt. This is required to make function
2328 pointers compare as equal between the normal executable and
2329 the shared library. */
2333 h
->root
.u
.def
.section
= s
;
2334 h
->root
.u
.def
.value
= h
->plt
.offset
;
2337 /* Make room for this entry. */
2338 s
->size
+= plt_entry_size
;
2340 /* We also need to make an entry in the .got.plt section, which
2341 will be placed in the .got section by the linker script. */
2342 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2344 /* We also need to make an entry in the .rela.plt section. */
2345 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2346 htab
->elf
.srelplt
->reloc_count
++;
2350 h
->plt
.offset
= (bfd_vma
) -1;
2356 h
->plt
.offset
= (bfd_vma
) -1;
2360 eh
->tlsdesc_got
= (bfd_vma
) -1;
2362 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2363 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2364 if (h
->got
.refcount
> 0
2367 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2369 h
->got
.offset
= (bfd_vma
) -1;
2371 else if (h
->got
.refcount
> 0)
2375 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2377 /* Make sure this symbol is output as a dynamic symbol.
2378 Undefined weak syms won't yet be marked as dynamic. */
2379 if (h
->dynindx
== -1
2380 && !h
->forced_local
)
2382 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2386 if (GOT_TLS_GDESC_P (tls_type
))
2388 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2389 - elf_x86_64_compute_jump_table_size (htab
);
2390 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2391 h
->got
.offset
= (bfd_vma
) -2;
2393 if (! GOT_TLS_GDESC_P (tls_type
)
2394 || GOT_TLS_GD_P (tls_type
))
2397 h
->got
.offset
= s
->size
;
2398 s
->size
+= GOT_ENTRY_SIZE
;
2399 if (GOT_TLS_GD_P (tls_type
))
2400 s
->size
+= GOT_ENTRY_SIZE
;
2402 dyn
= htab
->elf
.dynamic_sections_created
;
2403 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2405 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2406 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2407 || tls_type
== GOT_TLS_IE
)
2408 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2409 else if (GOT_TLS_GD_P (tls_type
))
2410 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2411 else if (! GOT_TLS_GDESC_P (tls_type
)
2412 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2413 || h
->root
.type
!= bfd_link_hash_undefweak
)
2415 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2416 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2417 if (GOT_TLS_GDESC_P (tls_type
))
2419 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2420 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2424 h
->got
.offset
= (bfd_vma
) -1;
2426 if (eh
->dyn_relocs
== NULL
)
2429 /* In the shared -Bsymbolic case, discard space allocated for
2430 dynamic pc-relative relocs against symbols which turn out to be
2431 defined in regular objects. For the normal shared case, discard
2432 space for pc-relative relocs that have become local due to symbol
2433 visibility changes. */
2437 /* Relocs that use pc_count are those that appear on a call
2438 insn, or certain REL relocs that can generated via assembly.
2439 We want calls to protected symbols to resolve directly to the
2440 function rather than going via the plt. If people want
2441 function pointer comparisons to work as expected then they
2442 should avoid writing weird assembly. */
2443 if (SYMBOL_CALLS_LOCAL (info
, h
))
2445 struct elf_dyn_relocs
**pp
;
2447 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2449 p
->count
-= p
->pc_count
;
2458 /* Also discard relocs on undefined weak syms with non-default
2460 if (eh
->dyn_relocs
!= NULL
2461 && h
->root
.type
== bfd_link_hash_undefweak
)
2463 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2464 eh
->dyn_relocs
= NULL
;
2466 /* Make sure undefined weak symbols are output as a dynamic
2468 else if (h
->dynindx
== -1
2469 && ! h
->forced_local
2470 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2475 else if (ELIMINATE_COPY_RELOCS
)
2477 /* For the non-shared case, discard space for relocs against
2478 symbols which turn out to need copy relocs or are not
2484 || (htab
->elf
.dynamic_sections_created
2485 && (h
->root
.type
== bfd_link_hash_undefweak
2486 || h
->root
.type
== bfd_link_hash_undefined
))))
2488 /* Make sure this symbol is output as a dynamic symbol.
2489 Undefined weak syms won't yet be marked as dynamic. */
2490 if (h
->dynindx
== -1
2491 && ! h
->forced_local
2492 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2495 /* If that succeeded, we know we'll be keeping all the
2497 if (h
->dynindx
!= -1)
2501 eh
->dyn_relocs
= NULL
;
2506 /* Finally, allocate space. */
2507 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2511 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2513 BFD_ASSERT (sreloc
!= NULL
);
2515 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2521 /* Allocate space in .plt, .got and associated reloc sections for
2522 local dynamic relocs. */
2525 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2527 struct elf_link_hash_entry
*h
2528 = (struct elf_link_hash_entry
*) *slot
;
2530 if (h
->type
!= STT_GNU_IFUNC
2534 || h
->root
.type
!= bfd_link_hash_defined
)
2537 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2540 /* Find any dynamic relocs that apply to read-only sections. */
2543 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2546 struct elf_x86_64_link_hash_entry
*eh
;
2547 struct elf_dyn_relocs
*p
;
2549 /* Skip local IFUNC symbols. */
2550 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2553 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2554 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2556 asection
*s
= p
->sec
->output_section
;
2558 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2560 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2562 info
->flags
|= DF_TEXTREL
;
2564 if (info
->warn_shared_textrel
&& info
->shared
)
2565 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2566 p
->sec
->owner
, h
->root
.root
.string
,
2569 /* Not an error, just cut short the traversal. */
2576 /* Set the sizes of the dynamic sections. */
2579 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
2580 struct bfd_link_info
*info
)
2582 struct elf_x86_64_link_hash_table
*htab
;
2587 const struct elf_backend_data
*bed
;
2589 htab
= elf_x86_64_hash_table (info
);
2592 bed
= get_elf_backend_data (output_bfd
);
2594 dynobj
= htab
->elf
.dynobj
;
2598 if (htab
->elf
.dynamic_sections_created
)
2600 /* Set the contents of the .interp section to the interpreter. */
2601 if (info
->executable
)
2603 s
= bfd_get_section_by_name (dynobj
, ".interp");
2606 s
->size
= htab
->dynamic_interpreter_size
;
2607 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2611 /* Set up .got offsets for local syms, and space for local dynamic
2613 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2615 bfd_signed_vma
*local_got
;
2616 bfd_signed_vma
*end_local_got
;
2617 char *local_tls_type
;
2618 bfd_vma
*local_tlsdesc_gotent
;
2619 bfd_size_type locsymcount
;
2620 Elf_Internal_Shdr
*symtab_hdr
;
2623 if (! is_x86_64_elf (ibfd
))
2626 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2628 struct elf_dyn_relocs
*p
;
2630 for (p
= (struct elf_dyn_relocs
*)
2631 (elf_section_data (s
)->local_dynrel
);
2635 if (!bfd_is_abs_section (p
->sec
)
2636 && bfd_is_abs_section (p
->sec
->output_section
))
2638 /* Input section has been discarded, either because
2639 it is a copy of a linkonce section or due to
2640 linker script /DISCARD/, so we'll be discarding
2643 else if (p
->count
!= 0)
2645 srel
= elf_section_data (p
->sec
)->sreloc
;
2646 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2647 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
2648 && (info
->flags
& DF_TEXTREL
) == 0)
2650 info
->flags
|= DF_TEXTREL
;
2651 if (info
->warn_shared_textrel
&& info
->shared
)
2652 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2653 p
->sec
->owner
, p
->sec
);
2659 local_got
= elf_local_got_refcounts (ibfd
);
2663 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2664 locsymcount
= symtab_hdr
->sh_info
;
2665 end_local_got
= local_got
+ locsymcount
;
2666 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
2667 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
2669 srel
= htab
->elf
.srelgot
;
2670 for (; local_got
< end_local_got
;
2671 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2673 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2676 if (GOT_TLS_GDESC_P (*local_tls_type
))
2678 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2679 - elf_x86_64_compute_jump_table_size (htab
);
2680 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2681 *local_got
= (bfd_vma
) -2;
2683 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2684 || GOT_TLS_GD_P (*local_tls_type
))
2686 *local_got
= s
->size
;
2687 s
->size
+= GOT_ENTRY_SIZE
;
2688 if (GOT_TLS_GD_P (*local_tls_type
))
2689 s
->size
+= GOT_ENTRY_SIZE
;
2692 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2693 || *local_tls_type
== GOT_TLS_IE
)
2695 if (GOT_TLS_GDESC_P (*local_tls_type
))
2697 htab
->elf
.srelplt
->size
2698 += bed
->s
->sizeof_rela
;
2699 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2701 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2702 || GOT_TLS_GD_P (*local_tls_type
))
2703 srel
->size
+= bed
->s
->sizeof_rela
;
2707 *local_got
= (bfd_vma
) -1;
2711 if (htab
->tls_ld_got
.refcount
> 0)
2713 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2715 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2716 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2717 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2720 htab
->tls_ld_got
.offset
= -1;
2722 /* Allocate global sym .plt and .got entries, and space for global
2723 sym dynamic relocs. */
2724 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
2727 /* Allocate .plt and .got entries, and space for local symbols. */
2728 htab_traverse (htab
->loc_hash_table
,
2729 elf_x86_64_allocate_local_dynrelocs
,
2732 /* For every jump slot reserved in the sgotplt, reloc_count is
2733 incremented. However, when we reserve space for TLS descriptors,
2734 it's not incremented, so in order to compute the space reserved
2735 for them, it suffices to multiply the reloc count by the jump
2738 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2739 so that R_X86_64_IRELATIVE entries come last. */
2740 if (htab
->elf
.srelplt
)
2742 htab
->sgotplt_jump_table_size
2743 = elf_x86_64_compute_jump_table_size (htab
);
2744 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
2746 else if (htab
->elf
.irelplt
)
2747 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
2749 if (htab
->tlsdesc_plt
)
2751 /* If we're not using lazy TLS relocations, don't generate the
2752 PLT and GOT entries they require. */
2753 if ((info
->flags
& DF_BIND_NOW
))
2754 htab
->tlsdesc_plt
= 0;
2757 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2758 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2759 /* Reserve room for the initial entry.
2760 FIXME: we could probably do away with it in this case. */
2761 if (htab
->elf
.splt
->size
== 0)
2762 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
2763 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2764 htab
->elf
.splt
->size
+= GET_PLT_ENTRY_SIZE (output_bfd
);
2768 if (htab
->elf
.sgotplt
)
2770 struct elf_link_hash_entry
*got
;
2771 got
= elf_link_hash_lookup (elf_hash_table (info
),
2772 "_GLOBAL_OFFSET_TABLE_",
2773 FALSE
, FALSE
, FALSE
);
2775 /* Don't allocate .got.plt section if there are no GOT nor PLT
2776 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2778 || !got
->ref_regular_nonweak
)
2779 && (htab
->elf
.sgotplt
->size
2780 == get_elf_backend_data (output_bfd
)->got_header_size
)
2781 && (htab
->elf
.splt
== NULL
2782 || htab
->elf
.splt
->size
== 0)
2783 && (htab
->elf
.sgot
== NULL
2784 || htab
->elf
.sgot
->size
== 0)
2785 && (htab
->elf
.iplt
== NULL
2786 || htab
->elf
.iplt
->size
== 0)
2787 && (htab
->elf
.igotplt
== NULL
2788 || htab
->elf
.igotplt
->size
== 0))
2789 htab
->elf
.sgotplt
->size
= 0;
2792 if (htab
->plt_eh_frame
!= NULL
2793 && htab
->elf
.splt
!= NULL
2794 && htab
->elf
.splt
->size
!= 0
2795 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
)
2796 && _bfd_elf_eh_frame_present (info
))
2798 const struct elf_x86_64_backend_data
*arch_data
2799 = (const struct elf_x86_64_backend_data
*) bed
->arch_data
;
2800 htab
->plt_eh_frame
->size
= arch_data
->eh_frame_plt_size
;
2803 /* We now have determined the sizes of the various dynamic sections.
2804 Allocate memory for them. */
2806 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2808 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2811 if (s
== htab
->elf
.splt
2812 || s
== htab
->elf
.sgot
2813 || s
== htab
->elf
.sgotplt
2814 || s
== htab
->elf
.iplt
2815 || s
== htab
->elf
.igotplt
2816 || s
== htab
->plt_eh_frame
2817 || s
== htab
->sdynbss
)
2819 /* Strip this section if we don't need it; see the
2822 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2824 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2827 /* We use the reloc_count field as a counter if we need
2828 to copy relocs into the output file. */
2829 if (s
!= htab
->elf
.srelplt
)
2834 /* It's not one of our sections, so don't allocate space. */
2840 /* If we don't need this section, strip it from the
2841 output file. This is mostly to handle .rela.bss and
2842 .rela.plt. We must create both sections in
2843 create_dynamic_sections, because they must be created
2844 before the linker maps input sections to output
2845 sections. The linker does that before
2846 adjust_dynamic_symbol is called, and it is that
2847 function which decides whether anything needs to go
2848 into these sections. */
2850 s
->flags
|= SEC_EXCLUDE
;
2854 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2857 /* Allocate memory for the section contents. We use bfd_zalloc
2858 here in case unused entries are not reclaimed before the
2859 section's contents are written out. This should not happen,
2860 but this way if it does, we get a R_X86_64_NONE reloc instead
2862 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2863 if (s
->contents
== NULL
)
2867 if (htab
->plt_eh_frame
!= NULL
2868 && htab
->plt_eh_frame
->contents
!= NULL
)
2870 const struct elf_x86_64_backend_data
*arch_data
2871 = (const struct elf_x86_64_backend_data
*) bed
->arch_data
;
2873 memcpy (htab
->plt_eh_frame
->contents
,
2874 arch_data
->eh_frame_plt
, htab
->plt_eh_frame
->size
);
2875 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
2876 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
2879 if (htab
->elf
.dynamic_sections_created
)
2881 /* Add some entries to the .dynamic section. We fill in the
2882 values later, in elf_x86_64_finish_dynamic_sections, but we
2883 must add the entries now so that we get the correct size for
2884 the .dynamic section. The DT_DEBUG entry is filled in by the
2885 dynamic linker and used by the debugger. */
2886 #define add_dynamic_entry(TAG, VAL) \
2887 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2889 if (info
->executable
)
2891 if (!add_dynamic_entry (DT_DEBUG
, 0))
2895 if (htab
->elf
.splt
->size
!= 0)
2897 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2898 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2899 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2900 || !add_dynamic_entry (DT_JMPREL
, 0))
2903 if (htab
->tlsdesc_plt
2904 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2905 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2911 if (!add_dynamic_entry (DT_RELA
, 0)
2912 || !add_dynamic_entry (DT_RELASZ
, 0)
2913 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
2916 /* If any dynamic relocs apply to a read-only section,
2917 then we need a DT_TEXTREL entry. */
2918 if ((info
->flags
& DF_TEXTREL
) == 0)
2919 elf_link_hash_traverse (&htab
->elf
,
2920 elf_x86_64_readonly_dynrelocs
,
2923 if ((info
->flags
& DF_TEXTREL
) != 0)
2925 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2930 #undef add_dynamic_entry
2936 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2937 struct bfd_link_info
*info
)
2939 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2943 struct elf_link_hash_entry
*tlsbase
;
2945 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2946 "_TLS_MODULE_BASE_",
2947 FALSE
, FALSE
, FALSE
);
2949 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2951 struct elf_x86_64_link_hash_table
*htab
;
2952 struct bfd_link_hash_entry
*bh
= NULL
;
2953 const struct elf_backend_data
*bed
2954 = get_elf_backend_data (output_bfd
);
2956 htab
= elf_x86_64_hash_table (info
);
2960 if (!(_bfd_generic_link_add_one_symbol
2961 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2962 tls_sec
, 0, NULL
, FALSE
,
2963 bed
->collect
, &bh
)))
2966 htab
->tls_module_base
= bh
;
2968 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2969 tlsbase
->def_regular
= 1;
2970 tlsbase
->other
= STV_HIDDEN
;
2971 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2978 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2979 executables. Rather than setting it to the beginning of the TLS
2980 section, we have to set it to the end. This function may be called
2981 multiple times, it is idempotent. */
2984 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2986 struct elf_x86_64_link_hash_table
*htab
;
2987 struct bfd_link_hash_entry
*base
;
2989 if (!info
->executable
)
2992 htab
= elf_x86_64_hash_table (info
);
2996 base
= htab
->tls_module_base
;
3000 base
->u
.def
.value
= htab
->elf
.tls_size
;
3003 /* Return the base VMA address which should be subtracted from real addresses
3004 when resolving @dtpoff relocation.
3005 This is PT_TLS segment p_vaddr. */
3008 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
3010 /* If tls_sec is NULL, we should have signalled an error already. */
3011 if (elf_hash_table (info
)->tls_sec
== NULL
)
3013 return elf_hash_table (info
)->tls_sec
->vma
;
3016 /* Return the relocation value for @tpoff relocation
3017 if STT_TLS virtual address is ADDRESS. */
3020 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
3022 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3023 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
3024 bfd_vma static_tls_size
;
3026 /* If tls_segment is NULL, we should have signalled an error already. */
3027 if (htab
->tls_sec
== NULL
)
3030 /* Consider special static TLS alignment requirements. */
3031 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
3032 return address
- static_tls_size
- htab
->tls_sec
->vma
;
3035 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3039 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
3041 /* Opcode Instruction
3044 0x0f 0x8x conditional jump */
3046 && (contents
[offset
- 1] == 0xe8
3047 || contents
[offset
- 1] == 0xe9))
3049 && contents
[offset
- 2] == 0x0f
3050 && (contents
[offset
- 1] & 0xf0) == 0x80));
3053 /* Relocate an x86_64 ELF section. */
3056 elf_x86_64_relocate_section (bfd
*output_bfd
,
3057 struct bfd_link_info
*info
,
3059 asection
*input_section
,
3061 Elf_Internal_Rela
*relocs
,
3062 Elf_Internal_Sym
*local_syms
,
3063 asection
**local_sections
)
3065 struct elf_x86_64_link_hash_table
*htab
;
3066 Elf_Internal_Shdr
*symtab_hdr
;
3067 struct elf_link_hash_entry
**sym_hashes
;
3068 bfd_vma
*local_got_offsets
;
3069 bfd_vma
*local_tlsdesc_gotents
;
3070 Elf_Internal_Rela
*rel
;
3071 Elf_Internal_Rela
*relend
;
3072 const unsigned int plt_entry_size
= GET_PLT_ENTRY_SIZE (info
->output_bfd
);
3074 BFD_ASSERT (is_x86_64_elf (input_bfd
));
3076 htab
= elf_x86_64_hash_table (info
);
3079 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
3080 sym_hashes
= elf_sym_hashes (input_bfd
);
3081 local_got_offsets
= elf_local_got_offsets (input_bfd
);
3082 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
3084 elf_x86_64_set_tls_module_base (info
);
3087 relend
= relocs
+ input_section
->reloc_count
;
3088 for (; rel
< relend
; rel
++)
3090 unsigned int r_type
;
3091 reloc_howto_type
*howto
;
3092 unsigned long r_symndx
;
3093 struct elf_link_hash_entry
*h
;
3094 Elf_Internal_Sym
*sym
;
3096 bfd_vma off
, offplt
;
3098 bfd_boolean unresolved_reloc
;
3099 bfd_reloc_status_type r
;
3103 r_type
= ELF32_R_TYPE (rel
->r_info
);
3104 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
3105 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
3108 if (r_type
>= R_X86_64_max
)
3110 bfd_set_error (bfd_error_bad_value
);
3114 if (r_type
!= (int) R_X86_64_32
3115 || ABI_64_P (output_bfd
))
3116 howto
= x86_64_elf_howto_table
+ r_type
;
3118 howto
= (x86_64_elf_howto_table
3119 + ARRAY_SIZE (x86_64_elf_howto_table
) - 1);
3120 r_symndx
= htab
->r_sym (rel
->r_info
);
3124 unresolved_reloc
= FALSE
;
3125 if (r_symndx
< symtab_hdr
->sh_info
)
3127 sym
= local_syms
+ r_symndx
;
3128 sec
= local_sections
[r_symndx
];
3130 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
3133 /* Relocate against local STT_GNU_IFUNC symbol. */
3134 if (!info
->relocatable
3135 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3137 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
3142 /* Set STT_GNU_IFUNC symbol value. */
3143 h
->root
.u
.def
.value
= sym
->st_value
;
3144 h
->root
.u
.def
.section
= sec
;
3149 bfd_boolean warned ATTRIBUTE_UNUSED
;
3151 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3152 r_symndx
, symtab_hdr
, sym_hashes
,
3154 unresolved_reloc
, warned
);
3157 if (sec
!= NULL
&& discarded_section (sec
))
3158 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
3159 rel
, 1, relend
, howto
, 0, contents
);
3161 if (info
->relocatable
)
3164 if (rel
->r_addend
== 0
3165 && r_type
== R_X86_64_64
3166 && !ABI_64_P (output_bfd
))
3168 /* For x32, treat R_X86_64_64 like R_X86_64_32 and zero-extend
3169 it to 64bit if addend is zero. */
3170 r_type
= R_X86_64_32
;
3171 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
3174 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3175 it here if it is defined in a non-shared object. */
3177 && h
->type
== STT_GNU_IFUNC
3184 if ((input_section
->flags
& SEC_ALLOC
) == 0
3185 || h
->plt
.offset
== (bfd_vma
) -1)
3188 /* STT_GNU_IFUNC symbol must go through PLT. */
3189 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
3190 relocation
= (plt
->output_section
->vma
3191 + plt
->output_offset
+ h
->plt
.offset
);
3196 if (h
->root
.root
.string
)
3197 name
= h
->root
.root
.string
;
3199 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
3201 (*_bfd_error_handler
)
3202 (_("%B: relocation %s against STT_GNU_IFUNC "
3203 "symbol `%s' isn't handled by %s"), input_bfd
,
3204 x86_64_elf_howto_table
[r_type
].name
,
3205 name
, __FUNCTION__
);
3206 bfd_set_error (bfd_error_bad_value
);
3215 if (ABI_64_P (output_bfd
))
3219 if (rel
->r_addend
!= 0)
3221 if (h
->root
.root
.string
)
3222 name
= h
->root
.root
.string
;
3224 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3226 (*_bfd_error_handler
)
3227 (_("%B: relocation %s against STT_GNU_IFUNC "
3228 "symbol `%s' has non-zero addend: %d"),
3229 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
3230 name
, rel
->r_addend
);
3231 bfd_set_error (bfd_error_bad_value
);
3235 /* Generate dynamic relcoation only when there is a
3236 non-GOT reference in a shared object. */
3237 if (info
->shared
&& h
->non_got_ref
)
3239 Elf_Internal_Rela outrel
;
3242 /* Need a dynamic relocation to get the real function
3244 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
3248 if (outrel
.r_offset
== (bfd_vma
) -1
3249 || outrel
.r_offset
== (bfd_vma
) -2)
3252 outrel
.r_offset
+= (input_section
->output_section
->vma
3253 + input_section
->output_offset
);
3255 if (h
->dynindx
== -1
3257 || info
->executable
)
3259 /* This symbol is resolved locally. */
3260 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3261 outrel
.r_addend
= (h
->root
.u
.def
.value
3262 + h
->root
.u
.def
.section
->output_section
->vma
3263 + h
->root
.u
.def
.section
->output_offset
);
3267 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3268 outrel
.r_addend
= 0;
3271 sreloc
= htab
->elf
.irelifunc
;
3272 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3274 /* If this reloc is against an external symbol, we
3275 do not want to fiddle with the addend. Otherwise,
3276 we need to include the symbol value so that it
3277 becomes an addend for the dynamic reloc. For an
3278 internal symbol, we have updated addend. */
3284 case R_X86_64_PLT32
:
3287 case R_X86_64_GOTPCREL
:
3288 case R_X86_64_GOTPCREL64
:
3289 base_got
= htab
->elf
.sgot
;
3290 off
= h
->got
.offset
;
3292 if (base_got
== NULL
)
3295 if (off
== (bfd_vma
) -1)
3297 /* We can't use h->got.offset here to save state, or
3298 even just remember the offset, as finish_dynamic_symbol
3299 would use that as offset into .got. */
3301 if (htab
->elf
.splt
!= NULL
)
3303 plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3304 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3305 base_got
= htab
->elf
.sgotplt
;
3309 plt_index
= h
->plt
.offset
/ plt_entry_size
;
3310 off
= plt_index
* GOT_ENTRY_SIZE
;
3311 base_got
= htab
->elf
.igotplt
;
3314 if (h
->dynindx
== -1
3318 /* This references the local defitionion. We must
3319 initialize this entry in the global offset table.
3320 Since the offset must always be a multiple of 8,
3321 we use the least significant bit to record
3322 whether we have initialized it already.
3324 When doing a dynamic link, we create a .rela.got
3325 relocation entry to initialize the value. This
3326 is done in the finish_dynamic_symbol routine. */
3331 bfd_put_64 (output_bfd
, relocation
,
3332 base_got
->contents
+ off
);
3333 /* Note that this is harmless for the GOTPLT64
3334 case, as -1 | 1 still is -1. */
3340 relocation
= (base_got
->output_section
->vma
3341 + base_got
->output_offset
+ off
);
3347 /* When generating a shared object, the relocations handled here are
3348 copied into the output file to be resolved at run time. */
3351 case R_X86_64_GOT32
:
3352 case R_X86_64_GOT64
:
3353 /* Relocation is to the entry for this symbol in the global
3355 case R_X86_64_GOTPCREL
:
3356 case R_X86_64_GOTPCREL64
:
3357 /* Use global offset table entry as symbol value. */
3358 case R_X86_64_GOTPLT64
:
3359 /* This is the same as GOT64 for relocation purposes, but
3360 indicates the existence of a PLT entry. The difficulty is,
3361 that we must calculate the GOT slot offset from the PLT
3362 offset, if this symbol got a PLT entry (it was global).
3363 Additionally if it's computed from the PLT entry, then that
3364 GOT offset is relative to .got.plt, not to .got. */
3365 base_got
= htab
->elf
.sgot
;
3367 if (htab
->elf
.sgot
== NULL
)
3374 off
= h
->got
.offset
;
3376 && h
->plt
.offset
!= (bfd_vma
)-1
3377 && off
== (bfd_vma
)-1)
3379 /* We can't use h->got.offset here to save
3380 state, or even just remember the offset, as
3381 finish_dynamic_symbol would use that as offset into
3383 bfd_vma plt_index
= h
->plt
.offset
/ plt_entry_size
- 1;
3384 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3385 base_got
= htab
->elf
.sgotplt
;
3388 dyn
= htab
->elf
.dynamic_sections_created
;
3390 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3392 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3393 || (ELF_ST_VISIBILITY (h
->other
)
3394 && h
->root
.type
== bfd_link_hash_undefweak
))
3396 /* This is actually a static link, or it is a -Bsymbolic
3397 link and the symbol is defined locally, or the symbol
3398 was forced to be local because of a version file. We
3399 must initialize this entry in the global offset table.
3400 Since the offset must always be a multiple of 8, we
3401 use the least significant bit to record whether we
3402 have initialized it already.
3404 When doing a dynamic link, we create a .rela.got
3405 relocation entry to initialize the value. This is
3406 done in the finish_dynamic_symbol routine. */
3411 bfd_put_64 (output_bfd
, relocation
,
3412 base_got
->contents
+ off
);
3413 /* Note that this is harmless for the GOTPLT64 case,
3414 as -1 | 1 still is -1. */
3419 unresolved_reloc
= FALSE
;
3423 if (local_got_offsets
== NULL
)
3426 off
= local_got_offsets
[r_symndx
];
3428 /* The offset must always be a multiple of 8. We use
3429 the least significant bit to record whether we have
3430 already generated the necessary reloc. */
3435 bfd_put_64 (output_bfd
, relocation
,
3436 base_got
->contents
+ off
);
3441 Elf_Internal_Rela outrel
;
3443 /* We need to generate a R_X86_64_RELATIVE reloc
3444 for the dynamic linker. */
3445 s
= htab
->elf
.srelgot
;
3449 outrel
.r_offset
= (base_got
->output_section
->vma
3450 + base_got
->output_offset
3452 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3453 outrel
.r_addend
= relocation
;
3454 elf_append_rela (output_bfd
, s
, &outrel
);
3457 local_got_offsets
[r_symndx
] |= 1;
3461 if (off
>= (bfd_vma
) -2)
3464 relocation
= base_got
->output_section
->vma
3465 + base_got
->output_offset
+ off
;
3466 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3467 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3468 - htab
->elf
.sgotplt
->output_offset
;
3472 case R_X86_64_GOTOFF64
:
3473 /* Relocation is relative to the start of the global offset
3476 /* Check to make sure it isn't a protected function symbol
3477 for shared library since it may not be local when used
3478 as function address. */
3479 if (!info
->executable
3481 && !SYMBOLIC_BIND (info
, h
)
3483 && h
->type
== STT_FUNC
3484 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3486 (*_bfd_error_handler
)
3487 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3488 input_bfd
, h
->root
.root
.string
);
3489 bfd_set_error (bfd_error_bad_value
);
3493 /* Note that sgot is not involved in this
3494 calculation. We always want the start of .got.plt. If we
3495 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3496 permitted by the ABI, we might have to change this
3498 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3499 + htab
->elf
.sgotplt
->output_offset
;
3502 case R_X86_64_GOTPC32
:
3503 case R_X86_64_GOTPC64
:
3504 /* Use global offset table as symbol value. */
3505 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3506 + htab
->elf
.sgotplt
->output_offset
;
3507 unresolved_reloc
= FALSE
;
3510 case R_X86_64_PLTOFF64
:
3511 /* Relocation is PLT entry relative to GOT. For local
3512 symbols it's the symbol itself relative to GOT. */
3514 /* See PLT32 handling. */
3515 && h
->plt
.offset
!= (bfd_vma
) -1
3516 && htab
->elf
.splt
!= NULL
)
3518 relocation
= (htab
->elf
.splt
->output_section
->vma
3519 + htab
->elf
.splt
->output_offset
3521 unresolved_reloc
= FALSE
;
3524 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3525 + htab
->elf
.sgotplt
->output_offset
;
3528 case R_X86_64_PLT32
:
3529 /* Relocation is to the entry for this symbol in the
3530 procedure linkage table. */
3532 /* Resolve a PLT32 reloc against a local symbol directly,
3533 without using the procedure linkage table. */
3537 if (h
->plt
.offset
== (bfd_vma
) -1
3538 || htab
->elf
.splt
== NULL
)
3540 /* We didn't make a PLT entry for this symbol. This
3541 happens when statically linking PIC code, or when
3542 using -Bsymbolic. */
3546 relocation
= (htab
->elf
.splt
->output_section
->vma
3547 + htab
->elf
.splt
->output_offset
3549 unresolved_reloc
= FALSE
;
3556 && (input_section
->flags
& SEC_ALLOC
) != 0
3557 && (input_section
->flags
& SEC_READONLY
) != 0
3560 bfd_boolean fail
= FALSE
;
3562 = (r_type
== R_X86_64_PC32
3563 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3565 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3567 /* Symbol is referenced locally. Make sure it is
3568 defined locally or for a branch. */
3569 fail
= !h
->def_regular
&& !branch
;
3573 /* Symbol isn't referenced locally. We only allow
3574 branch to symbol with non-default visibility. */
3576 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3583 const char *pic
= "";
3585 switch (ELF_ST_VISIBILITY (h
->other
))
3588 v
= _("hidden symbol");
3591 v
= _("internal symbol");
3594 v
= _("protected symbol");
3598 pic
= _("; recompile with -fPIC");
3603 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3605 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3607 (*_bfd_error_handler
) (fmt
, input_bfd
,
3608 x86_64_elf_howto_table
[r_type
].name
,
3609 v
, h
->root
.root
.string
, pic
);
3610 bfd_set_error (bfd_error_bad_value
);
3621 /* FIXME: The ABI says the linker should make sure the value is
3622 the same when it's zeroextended to 64 bit. */
3624 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3629 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3630 || h
->root
.type
!= bfd_link_hash_undefweak
)
3631 && (! IS_X86_64_PCREL_TYPE (r_type
)
3632 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3633 || (ELIMINATE_COPY_RELOCS
3640 || h
->root
.type
== bfd_link_hash_undefweak
3641 || h
->root
.type
== bfd_link_hash_undefined
)))
3643 Elf_Internal_Rela outrel
;
3644 bfd_boolean skip
, relocate
;
3647 /* When generating a shared object, these relocations
3648 are copied into the output file to be resolved at run
3654 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3656 if (outrel
.r_offset
== (bfd_vma
) -1)
3658 else if (outrel
.r_offset
== (bfd_vma
) -2)
3659 skip
= TRUE
, relocate
= TRUE
;
3661 outrel
.r_offset
+= (input_section
->output_section
->vma
3662 + input_section
->output_offset
);
3665 memset (&outrel
, 0, sizeof outrel
);
3667 /* h->dynindx may be -1 if this symbol was marked to
3671 && (IS_X86_64_PCREL_TYPE (r_type
)
3673 || ! SYMBOLIC_BIND (info
, h
)
3674 || ! h
->def_regular
))
3676 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3677 outrel
.r_addend
= rel
->r_addend
;
3681 /* This symbol is local, or marked to become local. */
3682 if (r_type
== htab
->pointer_r_type
)
3685 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3686 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3688 else if (r_type
== R_X86_64_64
3689 && !ABI_64_P (output_bfd
))
3692 outrel
.r_info
= htab
->r_info (0,
3693 R_X86_64_RELATIVE64
);
3694 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3695 /* Check addend overflow. */
3696 if ((outrel
.r_addend
& 0x80000000)
3697 != (rel
->r_addend
& 0x80000000))
3700 int addend
= rel
->r_addend
;
3701 if (h
&& h
->root
.root
.string
)
3702 name
= h
->root
.root
.string
;
3704 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3707 (*_bfd_error_handler
)
3708 (_("%B: addend -0x%x in relocation %s against "
3709 "symbol `%s' at 0x%lx in section `%A' is "
3711 input_bfd
, input_section
, addend
,
3712 x86_64_elf_howto_table
[r_type
].name
,
3713 name
, (unsigned long) rel
->r_offset
);
3715 (*_bfd_error_handler
)
3716 (_("%B: addend 0x%x in relocation %s against "
3717 "symbol `%s' at 0x%lx in section `%A' is "
3719 input_bfd
, input_section
, addend
,
3720 x86_64_elf_howto_table
[r_type
].name
,
3721 name
, (unsigned long) rel
->r_offset
);
3722 bfd_set_error (bfd_error_bad_value
);
3730 if (bfd_is_abs_section (sec
))
3732 else if (sec
== NULL
|| sec
->owner
== NULL
)
3734 bfd_set_error (bfd_error_bad_value
);
3741 /* We are turning this relocation into one
3742 against a section symbol. It would be
3743 proper to subtract the symbol's value,
3744 osec->vma, from the emitted reloc addend,
3745 but ld.so expects buggy relocs. */
3746 osec
= sec
->output_section
;
3747 sindx
= elf_section_data (osec
)->dynindx
;
3750 asection
*oi
= htab
->elf
.text_index_section
;
3751 sindx
= elf_section_data (oi
)->dynindx
;
3753 BFD_ASSERT (sindx
!= 0);
3756 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3757 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3761 sreloc
= elf_section_data (input_section
)->sreloc
;
3763 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3765 r
= bfd_reloc_notsupported
;
3766 goto check_relocation_error
;
3769 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3771 /* If this reloc is against an external symbol, we do
3772 not want to fiddle with the addend. Otherwise, we
3773 need to include the symbol value so that it becomes
3774 an addend for the dynamic reloc. */
3781 case R_X86_64_TLSGD
:
3782 case R_X86_64_GOTPC32_TLSDESC
:
3783 case R_X86_64_TLSDESC_CALL
:
3784 case R_X86_64_GOTTPOFF
:
3785 tls_type
= GOT_UNKNOWN
;
3786 if (h
== NULL
&& local_got_offsets
)
3787 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3789 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3791 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3792 input_section
, contents
,
3793 symtab_hdr
, sym_hashes
,
3794 &r_type
, tls_type
, rel
,
3795 relend
, h
, r_symndx
))
3798 if (r_type
== R_X86_64_TPOFF32
)
3800 bfd_vma roff
= rel
->r_offset
;
3802 BFD_ASSERT (! unresolved_reloc
);
3804 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3806 /* GD->LE transition. For 64bit, change
3807 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3808 .word 0x6666; rex64; call __tls_get_addr
3811 leaq foo@tpoff(%rax), %rax
3813 leaq foo@tlsgd(%rip), %rdi
3814 .word 0x6666; rex64; call __tls_get_addr
3817 leaq foo@tpoff(%rax), %rax */
3818 if (ABI_64_P (output_bfd
))
3819 memcpy (contents
+ roff
- 4,
3820 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3823 memcpy (contents
+ roff
- 3,
3824 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3826 bfd_put_32 (output_bfd
,
3827 elf_x86_64_tpoff (info
, relocation
),
3828 contents
+ roff
+ 8);
3829 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3833 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3835 /* GDesc -> LE transition.
3836 It's originally something like:
3837 leaq x@tlsdesc(%rip), %rax
3840 movl $x@tpoff, %rax. */
3842 unsigned int val
, type
;
3844 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3845 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3846 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3847 contents
+ roff
- 3);
3848 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3849 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3850 contents
+ roff
- 1);
3851 bfd_put_32 (output_bfd
,
3852 elf_x86_64_tpoff (info
, relocation
),
3856 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3858 /* GDesc -> LE transition.
3863 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3864 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3867 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3869 /* IE->LE transition:
3870 Originally it can be one of:
3871 movq foo@gottpoff(%rip), %reg
3872 addq foo@gottpoff(%rip), %reg
3875 leaq foo(%reg), %reg
3878 unsigned int val
, type
, reg
;
3880 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3881 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3882 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3888 bfd_put_8 (output_bfd
, 0x49,
3889 contents
+ roff
- 3);
3890 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3891 bfd_put_8 (output_bfd
, 0x41,
3892 contents
+ roff
- 3);
3893 bfd_put_8 (output_bfd
, 0xc7,
3894 contents
+ roff
- 2);
3895 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3896 contents
+ roff
- 1);
3900 /* addq -> addq - addressing with %rsp/%r12 is
3903 bfd_put_8 (output_bfd
, 0x49,
3904 contents
+ roff
- 3);
3905 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3906 bfd_put_8 (output_bfd
, 0x41,
3907 contents
+ roff
- 3);
3908 bfd_put_8 (output_bfd
, 0x81,
3909 contents
+ roff
- 2);
3910 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3911 contents
+ roff
- 1);
3917 bfd_put_8 (output_bfd
, 0x4d,
3918 contents
+ roff
- 3);
3919 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3920 bfd_put_8 (output_bfd
, 0x45,
3921 contents
+ roff
- 3);
3922 bfd_put_8 (output_bfd
, 0x8d,
3923 contents
+ roff
- 2);
3924 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3925 contents
+ roff
- 1);
3927 bfd_put_32 (output_bfd
,
3928 elf_x86_64_tpoff (info
, relocation
),
3936 if (htab
->elf
.sgot
== NULL
)
3941 off
= h
->got
.offset
;
3942 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
3946 if (local_got_offsets
== NULL
)
3949 off
= local_got_offsets
[r_symndx
];
3950 offplt
= local_tlsdesc_gotents
[r_symndx
];
3957 Elf_Internal_Rela outrel
;
3961 if (htab
->elf
.srelgot
== NULL
)
3964 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3966 if (GOT_TLS_GDESC_P (tls_type
))
3968 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3969 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3970 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3971 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3972 + htab
->elf
.sgotplt
->output_offset
3974 + htab
->sgotplt_jump_table_size
);
3975 sreloc
= htab
->elf
.srelplt
;
3977 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3979 outrel
.r_addend
= 0;
3980 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3983 sreloc
= htab
->elf
.srelgot
;
3985 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3986 + htab
->elf
.sgot
->output_offset
+ off
);
3988 if (GOT_TLS_GD_P (tls_type
))
3989 dr_type
= R_X86_64_DTPMOD64
;
3990 else if (GOT_TLS_GDESC_P (tls_type
))
3993 dr_type
= R_X86_64_TPOFF64
;
3995 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3996 outrel
.r_addend
= 0;
3997 if ((dr_type
== R_X86_64_TPOFF64
3998 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3999 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
4000 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
4002 elf_append_rela (output_bfd
, sreloc
, &outrel
);
4004 if (GOT_TLS_GD_P (tls_type
))
4008 BFD_ASSERT (! unresolved_reloc
);
4009 bfd_put_64 (output_bfd
,
4010 relocation
- elf_x86_64_dtpoff_base (info
),
4011 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4015 bfd_put_64 (output_bfd
, 0,
4016 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4017 outrel
.r_info
= htab
->r_info (indx
,
4019 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
4020 elf_append_rela (output_bfd
, sreloc
,
4029 local_got_offsets
[r_symndx
] |= 1;
4032 if (off
>= (bfd_vma
) -2
4033 && ! GOT_TLS_GDESC_P (tls_type
))
4035 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
4037 if (r_type
== R_X86_64_GOTPC32_TLSDESC
4038 || r_type
== R_X86_64_TLSDESC_CALL
)
4039 relocation
= htab
->elf
.sgotplt
->output_section
->vma
4040 + htab
->elf
.sgotplt
->output_offset
4041 + offplt
+ htab
->sgotplt_jump_table_size
;
4043 relocation
= htab
->elf
.sgot
->output_section
->vma
4044 + htab
->elf
.sgot
->output_offset
+ off
;
4045 unresolved_reloc
= FALSE
;
4049 bfd_vma roff
= rel
->r_offset
;
4051 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
4053 /* GD->IE transition. For 64bit, change
4054 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4055 .word 0x6666; rex64; call __tls_get_addr@plt
4058 addq foo@gottpoff(%rip), %rax
4060 leaq foo@tlsgd(%rip), %rdi
4061 .word 0x6666; rex64; call __tls_get_addr@plt
4064 addq foo@gottpoff(%rip), %rax */
4065 if (ABI_64_P (output_bfd
))
4066 memcpy (contents
+ roff
- 4,
4067 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4070 memcpy (contents
+ roff
- 3,
4071 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4074 relocation
= (htab
->elf
.sgot
->output_section
->vma
4075 + htab
->elf
.sgot
->output_offset
+ off
4077 - input_section
->output_section
->vma
4078 - input_section
->output_offset
4080 bfd_put_32 (output_bfd
, relocation
,
4081 contents
+ roff
+ 8);
4082 /* Skip R_X86_64_PLT32. */
4086 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
4088 /* GDesc -> IE transition.
4089 It's originally something like:
4090 leaq x@tlsdesc(%rip), %rax
4093 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4095 /* Now modify the instruction as appropriate. To
4096 turn a leaq into a movq in the form we use it, it
4097 suffices to change the second byte from 0x8d to
4099 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4101 bfd_put_32 (output_bfd
,
4102 htab
->elf
.sgot
->output_section
->vma
4103 + htab
->elf
.sgot
->output_offset
+ off
4105 - input_section
->output_section
->vma
4106 - input_section
->output_offset
4111 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
4113 /* GDesc -> IE transition.
4120 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4121 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4129 case R_X86_64_TLSLD
:
4130 if (! elf_x86_64_tls_transition (info
, input_bfd
,
4131 input_section
, contents
,
4132 symtab_hdr
, sym_hashes
,
4133 &r_type
, GOT_UNKNOWN
,
4134 rel
, relend
, h
, r_symndx
))
4137 if (r_type
!= R_X86_64_TLSLD
)
4139 /* LD->LE transition:
4140 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
4141 For 64bit, we change it into:
4142 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
4143 For 32bit, we change it into:
4144 nopl 0x0(%rax); movl %fs:0, %eax. */
4146 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
4147 if (ABI_64_P (output_bfd
))
4148 memcpy (contents
+ rel
->r_offset
- 3,
4149 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4151 memcpy (contents
+ rel
->r_offset
- 3,
4152 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4153 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
4158 if (htab
->elf
.sgot
== NULL
)
4161 off
= htab
->tls_ld_got
.offset
;
4166 Elf_Internal_Rela outrel
;
4168 if (htab
->elf
.srelgot
== NULL
)
4171 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4172 + htab
->elf
.sgot
->output_offset
+ off
);
4174 bfd_put_64 (output_bfd
, 0,
4175 htab
->elf
.sgot
->contents
+ off
);
4176 bfd_put_64 (output_bfd
, 0,
4177 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4178 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
4179 outrel
.r_addend
= 0;
4180 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
4182 htab
->tls_ld_got
.offset
|= 1;
4184 relocation
= htab
->elf
.sgot
->output_section
->vma
4185 + htab
->elf
.sgot
->output_offset
+ off
;
4186 unresolved_reloc
= FALSE
;
4189 case R_X86_64_DTPOFF32
:
4190 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
4191 relocation
-= elf_x86_64_dtpoff_base (info
);
4193 relocation
= elf_x86_64_tpoff (info
, relocation
);
4196 case R_X86_64_TPOFF32
:
4197 case R_X86_64_TPOFF64
:
4198 BFD_ASSERT (info
->executable
);
4199 relocation
= elf_x86_64_tpoff (info
, relocation
);
4206 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4207 because such sections are not SEC_ALLOC and thus ld.so will
4208 not process them. */
4209 if (unresolved_reloc
4210 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4212 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4213 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
);
4223 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4224 contents
, rel
->r_offset
,
4225 relocation
, rel
->r_addend
);
4227 check_relocation_error
:
4228 if (r
!= bfd_reloc_ok
)
4233 name
= h
->root
.root
.string
;
4236 name
= bfd_elf_string_from_elf_section (input_bfd
,
4237 symtab_hdr
->sh_link
,
4242 name
= bfd_section_name (input_bfd
, sec
);
4245 if (r
== bfd_reloc_overflow
)
4247 if (! ((*info
->callbacks
->reloc_overflow
)
4248 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4249 (bfd_vma
) 0, input_bfd
, input_section
,
4255 (*_bfd_error_handler
)
4256 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4257 input_bfd
, input_section
,
4258 (long) rel
->r_offset
, name
, (int) r
);
4267 /* Finish up dynamic symbol handling. We set the contents of various
4268 dynamic sections here. */
4271 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
4272 struct bfd_link_info
*info
,
4273 struct elf_link_hash_entry
*h
,
4274 Elf_Internal_Sym
*sym ATTRIBUTE_UNUSED
)
4276 struct elf_x86_64_link_hash_table
*htab
;
4277 const struct elf_x86_64_backend_data
*const abed
4278 = get_elf_x86_64_backend_data (output_bfd
);
4280 htab
= elf_x86_64_hash_table (info
);
4284 if (h
->plt
.offset
!= (bfd_vma
) -1)
4288 Elf_Internal_Rela rela
;
4290 asection
*plt
, *gotplt
, *relplt
;
4291 const struct elf_backend_data
*bed
;
4293 /* When building a static executable, use .iplt, .igot.plt and
4294 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4295 if (htab
->elf
.splt
!= NULL
)
4297 plt
= htab
->elf
.splt
;
4298 gotplt
= htab
->elf
.sgotplt
;
4299 relplt
= htab
->elf
.srelplt
;
4303 plt
= htab
->elf
.iplt
;
4304 gotplt
= htab
->elf
.igotplt
;
4305 relplt
= htab
->elf
.irelplt
;
4308 /* This symbol has an entry in the procedure linkage table. Set
4310 if ((h
->dynindx
== -1
4311 && !((h
->forced_local
|| info
->executable
)
4313 && h
->type
== STT_GNU_IFUNC
))
4319 /* Get the index in the procedure linkage table which
4320 corresponds to this symbol. This is the index of this symbol
4321 in all the symbols for which we are making plt entries. The
4322 first entry in the procedure linkage table is reserved.
4324 Get the offset into the .got table of the entry that
4325 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4326 bytes. The first three are reserved for the dynamic linker.
4328 For static executables, we don't reserve anything. */
4330 if (plt
== htab
->elf
.splt
)
4332 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
- 1;
4333 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
4337 got_offset
= h
->plt
.offset
/ abed
->plt_entry_size
;
4338 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
4341 /* Fill in the entry in the procedure linkage table. */
4342 memcpy (plt
->contents
+ h
->plt
.offset
, abed
->plt_entry
,
4343 abed
->plt_entry_size
);
4345 /* Insert the relocation positions of the plt section. */
4347 /* Put offset the PC-relative instruction referring to the GOT entry,
4348 subtracting the size of that instruction. */
4349 bfd_put_32 (output_bfd
,
4350 (gotplt
->output_section
->vma
4351 + gotplt
->output_offset
4353 - plt
->output_section
->vma
4354 - plt
->output_offset
4356 - abed
->plt_got_insn_size
),
4357 plt
->contents
+ h
->plt
.offset
+ abed
->plt_got_offset
);
4359 /* Fill in the entry in the global offset table, initially this
4360 points to the second part of the PLT entry. */
4361 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4362 + plt
->output_offset
4363 + h
->plt
.offset
+ abed
->plt_lazy_offset
),
4364 gotplt
->contents
+ got_offset
);
4366 /* Fill in the entry in the .rela.plt section. */
4367 rela
.r_offset
= (gotplt
->output_section
->vma
4368 + gotplt
->output_offset
4370 if (h
->dynindx
== -1
4371 || ((info
->executable
4372 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4374 && h
->type
== STT_GNU_IFUNC
))
4376 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4377 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4378 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4379 rela
.r_addend
= (h
->root
.u
.def
.value
4380 + h
->root
.u
.def
.section
->output_section
->vma
4381 + h
->root
.u
.def
.section
->output_offset
);
4382 /* R_X86_64_IRELATIVE comes last. */
4383 plt_index
= htab
->next_irelative_index
--;
4387 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4389 plt_index
= htab
->next_jump_slot_index
++;
4392 /* Don't fill PLT entry for static executables. */
4393 if (plt
== htab
->elf
.splt
)
4395 /* Put relocation index. */
4396 bfd_put_32 (output_bfd
, plt_index
,
4397 plt
->contents
+ h
->plt
.offset
+ abed
->plt_reloc_offset
);
4398 /* Put offset for jmp .PLT0. */
4399 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ abed
->plt_plt_insn_end
),
4400 plt
->contents
+ h
->plt
.offset
+ abed
->plt_plt_offset
);
4403 bed
= get_elf_backend_data (output_bfd
);
4404 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4405 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4407 if (!h
->def_regular
)
4409 /* Mark the symbol as undefined, rather than as defined in
4410 the .plt section. Leave the value if there were any
4411 relocations where pointer equality matters (this is a clue
4412 for the dynamic linker, to make function pointer
4413 comparisons work between an application and shared
4414 library), otherwise set it to zero. If a function is only
4415 called from a binary, there is no need to slow down
4416 shared libraries because of that. */
4417 sym
->st_shndx
= SHN_UNDEF
;
4418 if (!h
->pointer_equality_needed
)
4423 if (h
->got
.offset
!= (bfd_vma
) -1
4424 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
4425 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4427 Elf_Internal_Rela rela
;
4429 /* This symbol has an entry in the global offset table. Set it
4431 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4434 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4435 + htab
->elf
.sgot
->output_offset
4436 + (h
->got
.offset
&~ (bfd_vma
) 1));
4438 /* If this is a static link, or it is a -Bsymbolic link and the
4439 symbol is defined locally or was forced to be local because
4440 of a version file, we just want to emit a RELATIVE reloc.
4441 The entry in the global offset table will already have been
4442 initialized in the relocate_section function. */
4444 && h
->type
== STT_GNU_IFUNC
)
4448 /* Generate R_X86_64_GLOB_DAT. */
4455 if (!h
->pointer_equality_needed
)
4458 /* For non-shared object, we can't use .got.plt, which
4459 contains the real function addres if we need pointer
4460 equality. We load the GOT entry with the PLT entry. */
4461 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4462 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4463 + plt
->output_offset
4465 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4469 else if (info
->shared
4470 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4472 if (!h
->def_regular
)
4474 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4475 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4476 rela
.r_addend
= (h
->root
.u
.def
.value
4477 + h
->root
.u
.def
.section
->output_section
->vma
4478 + h
->root
.u
.def
.section
->output_offset
);
4482 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4484 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4485 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4486 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4490 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
4495 Elf_Internal_Rela rela
;
4497 /* This symbol needs a copy reloc. Set it up. */
4499 if (h
->dynindx
== -1
4500 || (h
->root
.type
!= bfd_link_hash_defined
4501 && h
->root
.type
!= bfd_link_hash_defweak
)
4502 || htab
->srelbss
== NULL
)
4505 rela
.r_offset
= (h
->root
.u
.def
.value
4506 + h
->root
.u
.def
.section
->output_section
->vma
4507 + h
->root
.u
.def
.section
->output_offset
);
4508 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4510 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
4516 /* Finish up local dynamic symbol handling. We set the contents of
4517 various dynamic sections here. */
4520 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4522 struct elf_link_hash_entry
*h
4523 = (struct elf_link_hash_entry
*) *slot
;
4524 struct bfd_link_info
*info
4525 = (struct bfd_link_info
*) inf
;
4527 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4531 /* Used to decide how to sort relocs in an optimal manner for the
4532 dynamic linker, before writing them out. */
4534 static enum elf_reloc_type_class
4535 elf_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4537 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4539 case R_X86_64_RELATIVE
:
4540 case R_X86_64_RELATIVE64
:
4541 return reloc_class_relative
;
4542 case R_X86_64_JUMP_SLOT
:
4543 return reloc_class_plt
;
4545 return reloc_class_copy
;
4547 return reloc_class_normal
;
4551 /* Finish up the dynamic sections. */
4554 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4555 struct bfd_link_info
*info
)
4557 struct elf_x86_64_link_hash_table
*htab
;
4560 const struct elf_x86_64_backend_data
*const abed
4561 = get_elf_x86_64_backend_data (output_bfd
);
4563 htab
= elf_x86_64_hash_table (info
);
4567 dynobj
= htab
->elf
.dynobj
;
4568 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4570 if (htab
->elf
.dynamic_sections_created
)
4572 bfd_byte
*dyncon
, *dynconend
;
4573 const struct elf_backend_data
*bed
;
4574 bfd_size_type sizeof_dyn
;
4576 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4579 bed
= get_elf_backend_data (dynobj
);
4580 sizeof_dyn
= bed
->s
->sizeof_dyn
;
4581 dyncon
= sdyn
->contents
;
4582 dynconend
= sdyn
->contents
+ sdyn
->size
;
4583 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
4585 Elf_Internal_Dyn dyn
;
4588 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
4596 s
= htab
->elf
.sgotplt
;
4597 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4601 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4605 s
= htab
->elf
.srelplt
->output_section
;
4606 dyn
.d_un
.d_val
= s
->size
;
4610 /* The procedure linkage table relocs (DT_JMPREL) should
4611 not be included in the overall relocs (DT_RELA).
4612 Therefore, we override the DT_RELASZ entry here to
4613 make it not include the JMPREL relocs. Since the
4614 linker script arranges for .rela.plt to follow all
4615 other relocation sections, we don't have to worry
4616 about changing the DT_RELA entry. */
4617 if (htab
->elf
.srelplt
!= NULL
)
4619 s
= htab
->elf
.srelplt
->output_section
;
4620 dyn
.d_un
.d_val
-= s
->size
;
4624 case DT_TLSDESC_PLT
:
4626 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4627 + htab
->tlsdesc_plt
;
4630 case DT_TLSDESC_GOT
:
4632 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4633 + htab
->tlsdesc_got
;
4637 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
4640 /* Fill in the special first entry in the procedure linkage table. */
4641 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4643 /* Fill in the first entry in the procedure linkage table. */
4644 memcpy (htab
->elf
.splt
->contents
,
4645 abed
->plt0_entry
, abed
->plt_entry_size
);
4646 /* Add offset for pushq GOT+8(%rip), since the instruction
4647 uses 6 bytes subtract this value. */
4648 bfd_put_32 (output_bfd
,
4649 (htab
->elf
.sgotplt
->output_section
->vma
4650 + htab
->elf
.sgotplt
->output_offset
4652 - htab
->elf
.splt
->output_section
->vma
4653 - htab
->elf
.splt
->output_offset
4655 htab
->elf
.splt
->contents
+ abed
->plt0_got1_offset
);
4656 /* Add offset for the PC-relative instruction accessing GOT+16,
4657 subtracting the offset to the end of that instruction. */
4658 bfd_put_32 (output_bfd
,
4659 (htab
->elf
.sgotplt
->output_section
->vma
4660 + htab
->elf
.sgotplt
->output_offset
4662 - htab
->elf
.splt
->output_section
->vma
4663 - htab
->elf
.splt
->output_offset
4664 - abed
->plt0_got2_insn_end
),
4665 htab
->elf
.splt
->contents
+ abed
->plt0_got2_offset
);
4667 elf_section_data (htab
->elf
.splt
->output_section
)
4668 ->this_hdr
.sh_entsize
= abed
->plt_entry_size
;
4670 if (htab
->tlsdesc_plt
)
4672 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4673 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4675 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4676 abed
->plt0_entry
, abed
->plt_entry_size
);
4678 /* Add offset for pushq GOT+8(%rip), since the
4679 instruction uses 6 bytes subtract this value. */
4680 bfd_put_32 (output_bfd
,
4681 (htab
->elf
.sgotplt
->output_section
->vma
4682 + htab
->elf
.sgotplt
->output_offset
4684 - htab
->elf
.splt
->output_section
->vma
4685 - htab
->elf
.splt
->output_offset
4688 htab
->elf
.splt
->contents
4689 + htab
->tlsdesc_plt
+ abed
->plt0_got1_offset
);
4690 /* Add offset for the PC-relative instruction accessing GOT+TDG,
4691 where TGD stands for htab->tlsdesc_got, subtracting the offset
4692 to the end of that instruction. */
4693 bfd_put_32 (output_bfd
,
4694 (htab
->elf
.sgot
->output_section
->vma
4695 + htab
->elf
.sgot
->output_offset
4697 - htab
->elf
.splt
->output_section
->vma
4698 - htab
->elf
.splt
->output_offset
4700 - abed
->plt0_got2_insn_end
),
4701 htab
->elf
.splt
->contents
4702 + htab
->tlsdesc_plt
+ abed
->plt0_got2_offset
);
4707 if (htab
->elf
.sgotplt
)
4709 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4711 (*_bfd_error_handler
)
4712 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4716 /* Fill in the first three entries in the global offset table. */
4717 if (htab
->elf
.sgotplt
->size
> 0)
4719 /* Set the first entry in the global offset table to the address of
4720 the dynamic section. */
4722 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4724 bfd_put_64 (output_bfd
,
4725 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4726 htab
->elf
.sgotplt
->contents
);
4727 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4728 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4729 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4732 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4736 /* Adjust .eh_frame for .plt section. */
4737 if (htab
->plt_eh_frame
!= NULL
4738 && htab
->plt_eh_frame
->contents
!= NULL
)
4740 if (htab
->elf
.splt
!= NULL
4741 && htab
->elf
.splt
->size
!= 0
4742 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
4743 && htab
->elf
.splt
->output_section
!= NULL
4744 && htab
->plt_eh_frame
->output_section
!= NULL
)
4746 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
4747 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
4748 + htab
->plt_eh_frame
->output_offset
4749 + PLT_FDE_START_OFFSET
;
4750 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
4751 htab
->plt_eh_frame
->contents
4752 + PLT_FDE_START_OFFSET
);
4754 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
4756 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
4758 htab
->plt_eh_frame
->contents
))
4763 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4764 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4767 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4768 htab_traverse (htab
->loc_hash_table
,
4769 elf_x86_64_finish_local_dynamic_symbol
,
4775 /* Return address for Ith PLT stub in section PLT, for relocation REL
4776 or (bfd_vma) -1 if it should not be included. */
4779 elf_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4780 const arelent
*rel ATTRIBUTE_UNUSED
)
4782 return plt
->vma
+ (i
+ 1) * GET_PLT_ENTRY_SIZE (plt
->owner
);
4785 /* Handle an x86-64 specific section when reading an object file. This
4786 is called when elfcode.h finds a section with an unknown type. */
4789 elf_x86_64_section_from_shdr (bfd
*abfd
,
4790 Elf_Internal_Shdr
*hdr
,
4794 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4797 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4803 /* Hook called by the linker routine which adds symbols from an object
4804 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4808 elf_x86_64_add_symbol_hook (bfd
*abfd
,
4809 struct bfd_link_info
*info
,
4810 Elf_Internal_Sym
*sym
,
4811 const char **namep ATTRIBUTE_UNUSED
,
4812 flagword
*flagsp ATTRIBUTE_UNUSED
,
4818 switch (sym
->st_shndx
)
4820 case SHN_X86_64_LCOMMON
:
4821 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4824 lcomm
= bfd_make_section_with_flags (abfd
,
4828 | SEC_LINKER_CREATED
));
4831 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4834 *valp
= sym
->st_size
;
4838 if ((abfd
->flags
& DYNAMIC
) == 0
4839 && (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
4840 || ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
))
4841 elf_tdata (info
->output_bfd
)->has_gnu_symbols
= TRUE
;
4847 /* Given a BFD section, try to locate the corresponding ELF section
4851 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4852 asection
*sec
, int *index_return
)
4854 if (sec
== &_bfd_elf_large_com_section
)
4856 *index_return
= SHN_X86_64_LCOMMON
;
4862 /* Process a symbol. */
4865 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4868 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4870 switch (elfsym
->internal_elf_sym
.st_shndx
)
4872 case SHN_X86_64_LCOMMON
:
4873 asym
->section
= &_bfd_elf_large_com_section
;
4874 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4875 /* Common symbol doesn't set BSF_GLOBAL. */
4876 asym
->flags
&= ~BSF_GLOBAL
;
4882 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4884 return (sym
->st_shndx
== SHN_COMMON
4885 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4889 elf_x86_64_common_section_index (asection
*sec
)
4891 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4894 return SHN_X86_64_LCOMMON
;
4898 elf_x86_64_common_section (asection
*sec
)
4900 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4901 return bfd_com_section_ptr
;
4903 return &_bfd_elf_large_com_section
;
4907 elf_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4908 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4909 struct elf_link_hash_entry
*h
,
4910 Elf_Internal_Sym
*sym
,
4912 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4913 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4914 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4915 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4916 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4917 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4918 bfd_boolean
*newdyn ATTRIBUTE_UNUSED
,
4919 bfd_boolean
*newdef
,
4920 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4921 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4922 bfd
*abfd ATTRIBUTE_UNUSED
,
4924 bfd_boolean
*olddyn ATTRIBUTE_UNUSED
,
4925 bfd_boolean
*olddef
,
4926 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4927 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4931 /* A normal common symbol and a large common symbol result in a
4932 normal common symbol. We turn the large common symbol into a
4935 && h
->root
.type
== bfd_link_hash_common
4937 && bfd_is_com_section (*sec
)
4940 if (sym
->st_shndx
== SHN_COMMON
4941 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4943 h
->root
.u
.c
.p
->section
4944 = bfd_make_section_old_way (oldbfd
, "COMMON");
4945 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4947 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4948 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4949 *psec
= *sec
= bfd_com_section_ptr
;
4956 elf_x86_64_additional_program_headers (bfd
*abfd
,
4957 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4962 /* Check to see if we need a large readonly segment. */
4963 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4964 if (s
&& (s
->flags
& SEC_LOAD
))
4967 /* Check to see if we need a large data segment. Since .lbss sections
4968 is placed right after the .bss section, there should be no need for
4969 a large data segment just because of .lbss. */
4970 s
= bfd_get_section_by_name (abfd
, ".ldata");
4971 if (s
&& (s
->flags
& SEC_LOAD
))
4977 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4980 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4982 if (h
->plt
.offset
!= (bfd_vma
) -1
4984 && !h
->pointer_equality_needed
)
4987 return _bfd_elf_hash_symbol (h
);
4990 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4993 elf_x86_64_relocs_compatible (const bfd_target
*input
,
4994 const bfd_target
*output
)
4996 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
4997 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
4998 && _bfd_elf_relocs_compatible (input
, output
));
5001 static const struct bfd_elf_special_section
5002 elf_x86_64_special_sections
[]=
5004 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5005 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5006 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
5007 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5008 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5009 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5010 { NULL
, 0, 0, 0, 0 }
5013 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
5014 #define TARGET_LITTLE_NAME "elf64-x86-64"
5015 #define ELF_ARCH bfd_arch_i386
5016 #define ELF_TARGET_ID X86_64_ELF_DATA
5017 #define ELF_MACHINE_CODE EM_X86_64
5018 #define ELF_MAXPAGESIZE 0x200000
5019 #define ELF_MINPAGESIZE 0x1000
5020 #define ELF_COMMONPAGESIZE 0x1000
5022 #define elf_backend_can_gc_sections 1
5023 #define elf_backend_can_refcount 1
5024 #define elf_backend_want_got_plt 1
5025 #define elf_backend_plt_readonly 1
5026 #define elf_backend_want_plt_sym 0
5027 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5028 #define elf_backend_rela_normal 1
5029 #define elf_backend_plt_alignment 4
5031 #define elf_info_to_howto elf_x86_64_info_to_howto
5033 #define bfd_elf64_bfd_link_hash_table_create \
5034 elf_x86_64_link_hash_table_create
5035 #define bfd_elf64_bfd_link_hash_table_free \
5036 elf_x86_64_link_hash_table_free
5037 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5038 #define bfd_elf64_bfd_reloc_name_lookup \
5039 elf_x86_64_reloc_name_lookup
5041 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
5042 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5043 #define elf_backend_check_relocs elf_x86_64_check_relocs
5044 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
5045 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
5046 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5047 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5048 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
5049 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
5050 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5051 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5053 #define elf_backend_write_core_note elf_x86_64_write_core_note
5055 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5056 #define elf_backend_relocate_section elf_x86_64_relocate_section
5057 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
5058 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5059 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5060 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
5061 #define elf_backend_object_p elf64_x86_64_elf_object_p
5062 #define bfd_elf64_mkobject elf_x86_64_mkobject
5064 #define elf_backend_section_from_shdr \
5065 elf_x86_64_section_from_shdr
5067 #define elf_backend_section_from_bfd_section \
5068 elf_x86_64_elf_section_from_bfd_section
5069 #define elf_backend_add_symbol_hook \
5070 elf_x86_64_add_symbol_hook
5071 #define elf_backend_symbol_processing \
5072 elf_x86_64_symbol_processing
5073 #define elf_backend_common_section_index \
5074 elf_x86_64_common_section_index
5075 #define elf_backend_common_section \
5076 elf_x86_64_common_section
5077 #define elf_backend_common_definition \
5078 elf_x86_64_common_definition
5079 #define elf_backend_merge_symbol \
5080 elf_x86_64_merge_symbol
5081 #define elf_backend_special_sections \
5082 elf_x86_64_special_sections
5083 #define elf_backend_additional_program_headers \
5084 elf_x86_64_additional_program_headers
5085 #define elf_backend_hash_symbol \
5086 elf_x86_64_hash_symbol
5088 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5090 #include "elf64-target.h"
5092 /* FreeBSD support. */
5094 #undef TARGET_LITTLE_SYM
5095 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
5096 #undef TARGET_LITTLE_NAME
5097 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5100 #define ELF_OSABI ELFOSABI_FREEBSD
5103 #define elf64_bed elf64_x86_64_fbsd_bed
5105 #include "elf64-target.h"
5107 /* Solaris 2 support. */
5109 #undef TARGET_LITTLE_SYM
5110 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
5111 #undef TARGET_LITTLE_NAME
5112 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5114 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5115 objects won't be recognized. */
5119 #define elf64_bed elf64_x86_64_sol2_bed
5121 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5123 #undef elf_backend_static_tls_alignment
5124 #define elf_backend_static_tls_alignment 16
5126 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5128 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5130 #undef elf_backend_want_plt_sym
5131 #define elf_backend_want_plt_sym 1
5133 #include "elf64-target.h"
5135 /* Native Client support. */
5137 #undef TARGET_LITTLE_SYM
5138 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec
5139 #undef TARGET_LITTLE_NAME
5140 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5142 #define elf64_bed elf64_x86_64_nacl_bed
5144 #undef ELF_MAXPAGESIZE
5145 #undef ELF_MINPAGESIZE
5146 #undef ELF_COMMONPAGESIZE
5147 #define ELF_MAXPAGESIZE 0x10000
5148 #define ELF_MINPAGESIZE 0x10000
5149 #define ELF_COMMONPAGESIZE 0x10000
5151 /* Restore defaults. */
5153 #undef elf_backend_static_tls_alignment
5154 #undef elf_backend_want_plt_sym
5155 #define elf_backend_want_plt_sym 0
5157 /* NaCl uses substantially different PLT entries for the same effects. */
5159 #undef elf_backend_plt_alignment
5160 #define elf_backend_plt_alignment 5
5161 #define NACL_PLT_ENTRY_SIZE 64
5162 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5164 static const bfd_byte elf_x86_64_nacl_plt0_entry
[NACL_PLT_ENTRY_SIZE
] =
5166 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5167 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5168 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
5169 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5170 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5172 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5173 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopl %cs:0x0(%rax,%rax,1) */
5175 /* 32 bytes of nop to pad out to the standard size. */
5176 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5177 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
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, /* excess data32 prefix */
5184 static const bfd_byte elf_x86_64_nacl_plt_entry
[NACL_PLT_ENTRY_SIZE
] =
5186 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5187 0x41, 0x83, 0xe3, NACLMASK
, /* and $-32, %r11d */
5188 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5189 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5191 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5192 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5193 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5195 /* Lazy GOT entries point here (32-byte aligned). */
5196 0x68, /* pushq immediate */
5197 0, 0, 0, 0, /* replaced with index into relocation table. */
5198 0xe9, /* jmp relative */
5199 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5201 /* 22 bytes of nop to pad out to the standard size. */
5202 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
5203 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5204 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5207 /* .eh_frame covering the .plt section. */
5209 static const bfd_byte elf_x86_64_nacl_eh_frame_plt
[] =
5211 #if (PLT_CIE_LENGTH != 20 \
5212 || PLT_FDE_LENGTH != 36 \
5213 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5214 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5215 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5217 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
5218 0, 0, 0, 0, /* CIE ID */
5219 1, /* CIE version */
5220 'z', 'R', 0, /* Augmentation string */
5221 1, /* Code alignment factor */
5222 0x78, /* Data alignment factor */
5223 16, /* Return address column */
5224 1, /* Augmentation size */
5225 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
5226 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5227 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5228 DW_CFA_nop
, DW_CFA_nop
,
5230 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
5231 PLT_CIE_LENGTH
+ 8, 0, 0, 0,/* CIE pointer */
5232 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5233 0, 0, 0, 0, /* .plt size goes here */
5234 0, /* Augmentation size */
5235 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
5236 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5237 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
5238 DW_CFA_advance_loc
+ 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5239 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
5240 13, /* Block length */
5241 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
5242 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
5243 DW_OP_const1u
, 63, DW_OP_and
, DW_OP_const1u
, 37, DW_OP_ge
,
5244 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
5245 DW_CFA_nop
, DW_CFA_nop
5248 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed
=
5250 elf_x86_64_nacl_plt0_entry
, /* plt0_entry */
5251 elf_x86_64_nacl_plt_entry
, /* plt_entry */
5252 NACL_PLT_ENTRY_SIZE
, /* plt_entry_size */
5253 2, /* plt0_got1_offset */
5254 9, /* plt0_got2_offset */
5255 13, /* plt0_got2_insn_end */
5256 3, /* plt_got_offset */
5257 33, /* plt_reloc_offset */
5258 38, /* plt_plt_offset */
5259 7, /* plt_got_insn_size */
5260 42, /* plt_plt_insn_end */
5261 32, /* plt_lazy_offset */
5262 elf_x86_64_nacl_eh_frame_plt
, /* eh_frame_plt */
5263 sizeof (elf_x86_64_nacl_eh_frame_plt
), /* eh_frame_plt_size */
5266 #undef elf_backend_arch_data
5267 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5269 #undef elf_backend_modify_segment_map
5270 #define elf_backend_modify_segment_map nacl_modify_segment_map
5271 #undef elf_backend_modify_program_headers
5272 #define elf_backend_modify_program_headers nacl_modify_program_headers
5274 #include "elf64-target.h"
5276 /* Native Client x32 support. */
5278 #undef TARGET_LITTLE_SYM
5279 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec
5280 #undef TARGET_LITTLE_NAME
5281 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5283 #define elf32_bed elf32_x86_64_nacl_bed
5285 #define bfd_elf32_bfd_link_hash_table_create \
5286 elf_x86_64_link_hash_table_create
5287 #define bfd_elf32_bfd_link_hash_table_free \
5288 elf_x86_64_link_hash_table_free
5289 #define bfd_elf32_bfd_reloc_type_lookup \
5290 elf_x86_64_reloc_type_lookup
5291 #define bfd_elf32_bfd_reloc_name_lookup \
5292 elf_x86_64_reloc_name_lookup
5293 #define bfd_elf32_mkobject \
5296 #undef elf_backend_object_p
5297 #define elf_backend_object_p \
5298 elf32_x86_64_elf_object_p
5300 #undef elf_backend_bfd_from_remote_memory
5301 #define elf_backend_bfd_from_remote_memory \
5302 _bfd_elf32_bfd_from_remote_memory
5304 #undef elf_backend_size_info
5305 #define elf_backend_size_info \
5306 _bfd_elf32_size_info
5308 #include "elf32-target.h"
5310 /* Restore defaults. */
5311 #undef elf_backend_object_p
5312 #define elf_backend_object_p elf64_x86_64_elf_object_p
5313 #undef elf_backend_bfd_from_remote_memory
5314 #undef elf_backend_size_info
5315 #undef elf_backend_modify_segment_map
5316 #undef elf_backend_modify_program_headers
5318 /* Intel L1OM support. */
5321 elf64_l1om_elf_object_p (bfd
*abfd
)
5323 /* Set the right machine number for an L1OM elf64 file. */
5324 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
5328 #undef TARGET_LITTLE_SYM
5329 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
5330 #undef TARGET_LITTLE_NAME
5331 #define TARGET_LITTLE_NAME "elf64-l1om"
5333 #define ELF_ARCH bfd_arch_l1om
5335 #undef ELF_MACHINE_CODE
5336 #define ELF_MACHINE_CODE EM_L1OM
5341 #define elf64_bed elf64_l1om_bed
5343 #undef elf_backend_object_p
5344 #define elf_backend_object_p elf64_l1om_elf_object_p
5346 /* Restore defaults. */
5347 #undef ELF_MAXPAGESIZE
5348 #undef ELF_MINPAGESIZE
5349 #undef ELF_COMMONPAGESIZE
5350 #define ELF_MAXPAGESIZE 0x200000
5351 #define ELF_MINPAGESIZE 0x1000
5352 #define ELF_COMMONPAGESIZE 0x1000
5353 #undef elf_backend_plt_alignment
5354 #define elf_backend_plt_alignment 4
5355 #undef elf_backend_arch_data
5356 #define elf_backend_arch_data &elf_x86_64_arch_bed
5358 #include "elf64-target.h"
5360 /* FreeBSD L1OM support. */
5362 #undef TARGET_LITTLE_SYM
5363 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
5364 #undef TARGET_LITTLE_NAME
5365 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5368 #define ELF_OSABI ELFOSABI_FREEBSD
5371 #define elf64_bed elf64_l1om_fbsd_bed
5373 #include "elf64-target.h"
5375 /* Intel K1OM support. */
5378 elf64_k1om_elf_object_p (bfd
*abfd
)
5380 /* Set the right machine number for an K1OM elf64 file. */
5381 bfd_default_set_arch_mach (abfd
, bfd_arch_k1om
, bfd_mach_k1om
);
5385 #undef TARGET_LITTLE_SYM
5386 #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec
5387 #undef TARGET_LITTLE_NAME
5388 #define TARGET_LITTLE_NAME "elf64-k1om"
5390 #define ELF_ARCH bfd_arch_k1om
5392 #undef ELF_MACHINE_CODE
5393 #define ELF_MACHINE_CODE EM_K1OM
5398 #define elf64_bed elf64_k1om_bed
5400 #undef elf_backend_object_p
5401 #define elf_backend_object_p elf64_k1om_elf_object_p
5403 #undef elf_backend_static_tls_alignment
5405 #undef elf_backend_want_plt_sym
5406 #define elf_backend_want_plt_sym 0
5408 #include "elf64-target.h"
5410 /* FreeBSD K1OM support. */
5412 #undef TARGET_LITTLE_SYM
5413 #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec
5414 #undef TARGET_LITTLE_NAME
5415 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5418 #define ELF_OSABI ELFOSABI_FREEBSD
5421 #define elf64_bed elf64_k1om_fbsd_bed
5423 #include "elf64-target.h"
5425 /* 32bit x86-64 support. */
5427 #undef TARGET_LITTLE_SYM
5428 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
5429 #undef TARGET_LITTLE_NAME
5430 #define TARGET_LITTLE_NAME "elf32-x86-64"
5434 #define ELF_ARCH bfd_arch_i386
5436 #undef ELF_MACHINE_CODE
5437 #define ELF_MACHINE_CODE EM_X86_64
5441 #undef elf_backend_object_p
5442 #define elf_backend_object_p \
5443 elf32_x86_64_elf_object_p
5445 #undef elf_backend_bfd_from_remote_memory
5446 #define elf_backend_bfd_from_remote_memory \
5447 _bfd_elf32_bfd_from_remote_memory
5449 #undef elf_backend_size_info
5450 #define elf_backend_size_info \
5451 _bfd_elf32_size_info
5453 #include "elf32-target.h"