1 /* X86-64 specific support for ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 Free Software Foundation, Inc.
4 Contributed by Jan Hubicka <jh@suse.cz>.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "elf/x86-64.h"
34 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
35 #define MINUS_ONE (~ (bfd_vma) 0)
37 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
38 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
39 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
40 since they are the same. */
42 #define ABI_64_P(abfd) \
43 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
45 /* The relocation "howto" table. Order of fields:
46 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
47 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
48 static reloc_howto_type x86_64_elf_howto_table
[] =
50 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
51 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
53 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
54 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
56 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
57 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
59 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
60 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
62 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
63 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
65 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
66 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
68 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
69 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
71 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
72 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
74 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
75 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
77 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
78 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
80 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
81 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
83 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
84 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
86 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
87 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
88 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
89 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
90 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
91 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
92 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
93 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
94 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
97 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
100 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
101 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
103 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
104 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
106 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
107 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
109 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
110 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
112 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
113 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
115 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
116 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
118 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
119 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
121 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
122 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
123 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
124 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
125 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
126 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
127 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
128 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
130 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
131 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
133 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
134 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
135 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
136 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
137 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
139 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
140 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
144 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
145 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
146 "R_X86_64_GOTPC32_TLSDESC",
147 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
148 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
149 complain_overflow_dont
, bfd_elf_generic_reloc
,
150 "R_X86_64_TLSDESC_CALL",
152 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
153 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
155 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
156 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
157 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
160 /* We have a gap in the reloc numbers here.
161 R_X86_64_standard counts the number up to this point, and
162 R_X86_64_vt_offset is the value to subtract from a reloc type of
163 R_X86_64_GNU_VT* to form an index into this table. */
164 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
165 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
167 /* GNU extension to record C++ vtable hierarchy. */
168 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
169 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
171 /* GNU extension to record C++ vtable member usage. */
172 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
173 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
177 #define IS_X86_64_PCREL_TYPE(TYPE) \
178 ( ((TYPE) == R_X86_64_PC8) \
179 || ((TYPE) == R_X86_64_PC16) \
180 || ((TYPE) == R_X86_64_PC32) \
181 || ((TYPE) == R_X86_64_PC64))
183 /* Map BFD relocs to the x86_64 elf relocs. */
186 bfd_reloc_code_real_type bfd_reloc_val
;
187 unsigned char elf_reloc_val
;
190 static const struct elf_reloc_map x86_64_reloc_map
[] =
192 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
193 { BFD_RELOC_64
, R_X86_64_64
, },
194 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
195 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
196 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
197 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
198 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
199 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
200 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
201 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
202 { BFD_RELOC_32
, R_X86_64_32
, },
203 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
204 { BFD_RELOC_16
, R_X86_64_16
, },
205 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
206 { BFD_RELOC_8
, R_X86_64_8
, },
207 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
208 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
209 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
210 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
211 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
212 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
213 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
214 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
215 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
216 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
217 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
218 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
219 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
220 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
221 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
222 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
223 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
224 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
225 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
226 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
227 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
228 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
229 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
232 static reloc_howto_type
*
233 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
237 if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
238 || r_type
>= (unsigned int) R_X86_64_max
)
240 if (r_type
>= (unsigned int) R_X86_64_standard
)
242 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
244 r_type
= R_X86_64_NONE
;
249 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
250 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
251 return &x86_64_elf_howto_table
[i
];
254 /* Given a BFD reloc type, return a HOWTO structure. */
255 static reloc_howto_type
*
256 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
257 bfd_reloc_code_real_type code
)
261 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
264 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
265 return elf_x86_64_rtype_to_howto (abfd
,
266 x86_64_reloc_map
[i
].elf_reloc_val
);
271 static reloc_howto_type
*
272 elf_x86_64_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
278 i
< (sizeof (x86_64_elf_howto_table
)
279 / sizeof (x86_64_elf_howto_table
[0]));
281 if (x86_64_elf_howto_table
[i
].name
!= NULL
282 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
283 return &x86_64_elf_howto_table
[i
];
288 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
291 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
292 Elf_Internal_Rela
*dst
)
296 r_type
= ELF32_R_TYPE (dst
->r_info
);
297 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
298 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
301 /* Support for core dump NOTE sections. */
303 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
308 switch (note
->descsz
)
313 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
315 elf_tdata (abfd
)->core_signal
316 = bfd_get_16 (abfd
, note
->descdata
+ 12);
319 elf_tdata (abfd
)->core_lwpid
320 = bfd_get_32 (abfd
, note
->descdata
+ 32);
329 /* Make a ".reg/999" section. */
330 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
331 size
, note
->descpos
+ offset
);
335 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
337 switch (note
->descsz
)
342 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
343 elf_tdata (abfd
)->core_pid
344 = bfd_get_32 (abfd
, note
->descdata
+ 24);
345 elf_tdata (abfd
)->core_program
346 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
347 elf_tdata (abfd
)->core_command
348 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
351 /* Note that for some reason, a spurious space is tacked
352 onto the end of the args in some (at least one anyway)
353 implementations, so strip it off if it exists. */
356 char *command
= elf_tdata (abfd
)->core_command
;
357 int n
= strlen (command
);
359 if (0 < n
&& command
[n
- 1] == ' ')
360 command
[n
- 1] = '\0';
366 /* Functions for the x86-64 ELF linker. */
368 /* The name of the dynamic interpreter. This is put in the .interp
371 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
372 #define ELF32_DYNAMIC_INTERPRETER "/lib/ld32.so.1"
374 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
375 copying dynamic variables from a shared lib into an app's dynbss
376 section, and instead use a dynamic relocation to point into the
378 #define ELIMINATE_COPY_RELOCS 1
380 /* The size in bytes of an entry in the global offset table. */
382 #define GOT_ENTRY_SIZE 8
384 /* The size in bytes of an entry in the procedure linkage table. */
386 #define PLT_ENTRY_SIZE 16
388 /* The first entry in a procedure linkage table looks like this. See the
389 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
391 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
393 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
394 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
395 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
398 /* Subsequent entries in a procedure linkage table look like this. */
400 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
402 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
403 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
404 0x68, /* pushq immediate */
405 0, 0, 0, 0, /* replaced with index into relocation table. */
406 0xe9, /* jmp relative */
407 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
410 /* x86-64 ELF linker hash entry. */
412 struct elf_x86_64_link_hash_entry
414 struct elf_link_hash_entry elf
;
416 /* Track dynamic relocs copied for this symbol. */
417 struct elf_dyn_relocs
*dyn_relocs
;
419 #define GOT_UNKNOWN 0
423 #define GOT_TLS_GDESC 4
424 #define GOT_TLS_GD_BOTH_P(type) \
425 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
426 #define GOT_TLS_GD_P(type) \
427 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
428 #define GOT_TLS_GDESC_P(type) \
429 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
430 #define GOT_TLS_GD_ANY_P(type) \
431 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
432 unsigned char tls_type
;
434 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
435 starting at the end of the jump table. */
439 #define elf_x86_64_hash_entry(ent) \
440 ((struct elf_x86_64_link_hash_entry *)(ent))
442 struct elf_x86_64_obj_tdata
444 struct elf_obj_tdata root
;
446 /* tls_type for each local got entry. */
447 char *local_got_tls_type
;
449 /* GOTPLT entries for TLS descriptors. */
450 bfd_vma
*local_tlsdesc_gotent
;
453 #define elf_x86_64_tdata(abfd) \
454 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
456 #define elf_x86_64_local_got_tls_type(abfd) \
457 (elf_x86_64_tdata (abfd)->local_got_tls_type)
459 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
460 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
462 #define is_x86_64_elf(bfd) \
463 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
464 && elf_tdata (bfd) != NULL \
465 && elf_object_id (bfd) == X86_64_ELF_DATA)
468 elf_x86_64_mkobject (bfd
*abfd
)
470 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
474 /* x86-64 ELF linker hash table. */
476 struct elf_x86_64_link_hash_table
478 struct elf_link_hash_table elf
;
480 /* Short-cuts to get to dynamic linker sections. */
486 bfd_signed_vma refcount
;
490 /* The amount of space used by the jump slots in the GOT. */
491 bfd_vma sgotplt_jump_table_size
;
493 /* Small local sym cache. */
494 struct sym_cache sym_cache
;
496 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
497 bfd_vma (*r_sym
) (bfd_vma
);
498 void (*swap_reloca_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
499 const char *dynamic_interpreter
;
500 int dynamic_interpreter_size
;
502 /* _TLS_MODULE_BASE_ symbol. */
503 struct bfd_link_hash_entry
*tls_module_base
;
505 /* Used by local STT_GNU_IFUNC symbols. */
506 htab_t loc_hash_table
;
507 void * loc_hash_memory
;
509 /* The offset into splt of the PLT entry for the TLS descriptor
510 resolver. Special values are 0, if not necessary (or not found
511 to be necessary yet), and -1 if needed but not determined
514 /* The offset into sgot of the GOT entry used by the PLT entry
519 /* Get the x86-64 ELF linker hash table from a link_info structure. */
521 #define elf_x86_64_hash_table(p) \
522 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
523 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
525 #define elf_x86_64_compute_jump_table_size(htab) \
526 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
528 /* Create an entry in an x86-64 ELF linker hash table. */
530 static struct bfd_hash_entry
*
531 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
532 struct bfd_hash_table
*table
,
535 /* Allocate the structure if it has not already been allocated by a
539 entry
= (struct bfd_hash_entry
*)
540 bfd_hash_allocate (table
,
541 sizeof (struct elf_x86_64_link_hash_entry
));
546 /* Call the allocation method of the superclass. */
547 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
550 struct elf_x86_64_link_hash_entry
*eh
;
552 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
553 eh
->dyn_relocs
= NULL
;
554 eh
->tls_type
= GOT_UNKNOWN
;
555 eh
->tlsdesc_got
= (bfd_vma
) -1;
561 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
562 for local symbol so that we can handle local STT_GNU_IFUNC symbols
563 as global symbol. We reuse indx and dynstr_index for local symbol
564 hash since they aren't used by global symbols in this backend. */
567 elf_x86_64_local_htab_hash (const void *ptr
)
569 struct elf_link_hash_entry
*h
570 = (struct elf_link_hash_entry
*) ptr
;
571 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
574 /* Compare local hash entries. */
577 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
579 struct elf_link_hash_entry
*h1
580 = (struct elf_link_hash_entry
*) ptr1
;
581 struct elf_link_hash_entry
*h2
582 = (struct elf_link_hash_entry
*) ptr2
;
584 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
587 /* Find and/or create a hash entry for local symbol. */
589 static struct elf_link_hash_entry
*
590 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
591 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
594 struct elf_x86_64_link_hash_entry e
, *ret
;
595 asection
*sec
= abfd
->sections
;
596 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
597 htab
->r_sym (rel
->r_info
));
600 e
.elf
.indx
= sec
->id
;
601 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
602 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
603 create
? INSERT
: NO_INSERT
);
610 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
614 ret
= (struct elf_x86_64_link_hash_entry
*)
615 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
616 sizeof (struct elf_x86_64_link_hash_entry
));
619 memset (ret
, 0, sizeof (*ret
));
620 ret
->elf
.indx
= sec
->id
;
621 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
622 ret
->elf
.dynindx
= -1;
628 /* Create an X86-64 ELF linker hash table. */
630 static struct bfd_link_hash_table
*
631 elf_x86_64_link_hash_table_create (bfd
*abfd
)
633 struct elf_x86_64_link_hash_table
*ret
;
634 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
636 ret
= (struct elf_x86_64_link_hash_table
*) bfd_malloc (amt
);
640 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
641 elf_x86_64_link_hash_newfunc
,
642 sizeof (struct elf_x86_64_link_hash_entry
),
651 ret
->sym_cache
.abfd
= NULL
;
652 ret
->tlsdesc_plt
= 0;
653 ret
->tlsdesc_got
= 0;
654 ret
->tls_ld_got
.refcount
= 0;
655 ret
->sgotplt_jump_table_size
= 0;
656 ret
->tls_module_base
= NULL
;
660 ret
->r_info
= elf64_r_info
;
661 ret
->r_sym
= elf64_r_sym
;
662 ret
->swap_reloca_out
= bfd_elf64_swap_reloca_out
;
663 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
664 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
668 ret
->r_info
= elf32_r_info
;
669 ret
->r_sym
= elf32_r_sym
;
670 ret
->swap_reloca_out
= bfd_elf32_swap_reloca_out
;
671 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
672 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
675 ret
->loc_hash_table
= htab_try_create (1024,
676 elf_x86_64_local_htab_hash
,
677 elf_x86_64_local_htab_eq
,
679 ret
->loc_hash_memory
= objalloc_create ();
680 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
686 return &ret
->elf
.root
;
689 /* Destroy an X86-64 ELF linker hash table. */
692 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table
*hash
)
694 struct elf_x86_64_link_hash_table
*htab
695 = (struct elf_x86_64_link_hash_table
*) hash
;
697 if (htab
->loc_hash_table
)
698 htab_delete (htab
->loc_hash_table
);
699 if (htab
->loc_hash_memory
)
700 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
701 _bfd_generic_link_hash_table_free (hash
);
704 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
705 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
709 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
710 struct bfd_link_info
*info
)
712 struct elf_x86_64_link_hash_table
*htab
;
714 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
717 htab
= elf_x86_64_hash_table (info
);
721 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
723 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
726 || (!info
->shared
&& !htab
->srelbss
))
732 /* Copy the extra info we tack onto an elf_link_hash_entry. */
735 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
736 struct elf_link_hash_entry
*dir
,
737 struct elf_link_hash_entry
*ind
)
739 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
741 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
742 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
744 if (eind
->dyn_relocs
!= NULL
)
746 if (edir
->dyn_relocs
!= NULL
)
748 struct elf_dyn_relocs
**pp
;
749 struct elf_dyn_relocs
*p
;
751 /* Add reloc counts against the indirect sym to the direct sym
752 list. Merge any entries against the same section. */
753 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
755 struct elf_dyn_relocs
*q
;
757 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
758 if (q
->sec
== p
->sec
)
760 q
->pc_count
+= p
->pc_count
;
761 q
->count
+= p
->count
;
768 *pp
= edir
->dyn_relocs
;
771 edir
->dyn_relocs
= eind
->dyn_relocs
;
772 eind
->dyn_relocs
= NULL
;
775 if (ind
->root
.type
== bfd_link_hash_indirect
776 && dir
->got
.refcount
<= 0)
778 edir
->tls_type
= eind
->tls_type
;
779 eind
->tls_type
= GOT_UNKNOWN
;
782 if (ELIMINATE_COPY_RELOCS
783 && ind
->root
.type
!= bfd_link_hash_indirect
784 && dir
->dynamic_adjusted
)
786 /* If called to transfer flags for a weakdef during processing
787 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
788 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
789 dir
->ref_dynamic
|= ind
->ref_dynamic
;
790 dir
->ref_regular
|= ind
->ref_regular
;
791 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
792 dir
->needs_plt
|= ind
->needs_plt
;
793 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
796 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
800 elf64_x86_64_elf_object_p (bfd
*abfd
)
802 /* Set the right machine number for an x86-64 elf64 file. */
803 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
821 /* Return TRUE if the TLS access code sequence support transition
825 elf_x86_64_check_tls_transition (bfd
*abfd
,
826 struct bfd_link_info
*info
,
829 Elf_Internal_Shdr
*symtab_hdr
,
830 struct elf_link_hash_entry
**sym_hashes
,
832 const Elf_Internal_Rela
*rel
,
833 const Elf_Internal_Rela
*relend
)
836 unsigned long r_symndx
;
837 struct elf_link_hash_entry
*h
;
839 struct elf_x86_64_link_hash_table
*htab
;
841 /* Get the section contents. */
842 if (contents
== NULL
)
844 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
845 contents
= elf_section_data (sec
)->this_hdr
.contents
;
848 /* FIXME: How to better handle error condition? */
849 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
852 /* Cache the section contents for elf_link_input_bfd. */
853 elf_section_data (sec
)->this_hdr
.contents
= contents
;
857 htab
= elf_x86_64_hash_table (info
);
858 offset
= rel
->r_offset
;
863 if ((rel
+ 1) >= relend
)
866 if (r_type
== R_X86_64_TLSGD
)
868 /* Check transition from GD access model. Only
869 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
870 .word 0x6666; rex64; call __tls_get_addr
871 can transit to different access model. */
873 static x86_64_opcode32 leaq
= { { 0x66, 0x48, 0x8d, 0x3d } },
874 call
= { { 0x66, 0x66, 0x48, 0xe8 } };
876 || (offset
+ 12) > sec
->size
877 || bfd_get_32 (abfd
, contents
+ offset
- 4) != leaq
.i
878 || bfd_get_32 (abfd
, contents
+ offset
+ 4) != call
.i
)
883 /* Check transition from LD access model. Only
884 leaq foo@tlsld(%rip), %rdi;
886 can transit to different access model. */
888 static x86_64_opcode32 ld
= { { 0x48, 0x8d, 0x3d, 0xe8 } };
891 if (offset
< 3 || (offset
+ 9) > sec
->size
)
894 op
.i
= bfd_get_32 (abfd
, contents
+ offset
- 3);
895 op
.c
[3] = bfd_get_8 (abfd
, contents
+ offset
+ 4);
900 r_symndx
= htab
->r_sym (rel
[1].r_info
);
901 if (r_symndx
< symtab_hdr
->sh_info
)
904 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
905 /* Use strncmp to check __tls_get_addr since __tls_get_addr
908 && h
->root
.root
.string
!= NULL
909 && (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
910 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
911 && (strncmp (h
->root
.root
.string
,
912 "__tls_get_addr", 14) == 0));
914 case R_X86_64_GOTTPOFF
:
915 /* Check transition from IE access model:
916 movq foo@gottpoff(%rip), %reg
917 addq foo@gottpoff(%rip), %reg
920 if (offset
< 3 || (offset
+ 4) > sec
->size
)
923 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
924 if (val
!= 0x48 && val
!= 0x4c)
927 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
928 if (val
!= 0x8b && val
!= 0x03)
931 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
932 return (val
& 0xc7) == 5;
934 case R_X86_64_GOTPC32_TLSDESC
:
935 /* Check transition from GDesc access model:
936 leaq x@tlsdesc(%rip), %rax
938 Make sure it's a leaq adding rip to a 32-bit offset
939 into any register, although it's probably almost always
942 if (offset
< 3 || (offset
+ 4) > sec
->size
)
945 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
946 if ((val
& 0xfb) != 0x48)
949 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
952 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
953 return (val
& 0xc7) == 0x05;
955 case R_X86_64_TLSDESC_CALL
:
956 /* Check transition from GDesc access model:
957 call *x@tlsdesc(%rax)
959 if (offset
+ 2 <= sec
->size
)
961 /* Make sure that it's a call *x@tlsdesc(%rax). */
962 static x86_64_opcode16 call
= { { 0xff, 0x10 } };
963 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
973 /* Return TRUE if the TLS access transition is OK or no transition
974 will be performed. Update R_TYPE if there is a transition. */
977 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
978 asection
*sec
, bfd_byte
*contents
,
979 Elf_Internal_Shdr
*symtab_hdr
,
980 struct elf_link_hash_entry
**sym_hashes
,
981 unsigned int *r_type
, int tls_type
,
982 const Elf_Internal_Rela
*rel
,
983 const Elf_Internal_Rela
*relend
,
984 struct elf_link_hash_entry
*h
,
985 unsigned long r_symndx
)
987 unsigned int from_type
= *r_type
;
988 unsigned int to_type
= from_type
;
989 bfd_boolean check
= TRUE
;
991 /* Skip TLS transition for functions. */
993 && (h
->type
== STT_FUNC
994 || h
->type
== STT_GNU_IFUNC
))
1000 case R_X86_64_GOTPC32_TLSDESC
:
1001 case R_X86_64_TLSDESC_CALL
:
1002 case R_X86_64_GOTTPOFF
:
1003 if (info
->executable
)
1006 to_type
= R_X86_64_TPOFF32
;
1008 to_type
= R_X86_64_GOTTPOFF
;
1011 /* When we are called from elf_x86_64_relocate_section,
1012 CONTENTS isn't NULL and there may be additional transitions
1013 based on TLS_TYPE. */
1014 if (contents
!= NULL
)
1016 unsigned int new_to_type
= to_type
;
1018 if (info
->executable
1021 && tls_type
== GOT_TLS_IE
)
1022 new_to_type
= R_X86_64_TPOFF32
;
1024 if (to_type
== R_X86_64_TLSGD
1025 || to_type
== R_X86_64_GOTPC32_TLSDESC
1026 || to_type
== R_X86_64_TLSDESC_CALL
)
1028 if (tls_type
== GOT_TLS_IE
)
1029 new_to_type
= R_X86_64_GOTTPOFF
;
1032 /* We checked the transition before when we were called from
1033 elf_x86_64_check_relocs. We only want to check the new
1034 transition which hasn't been checked before. */
1035 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1036 to_type
= new_to_type
;
1041 case R_X86_64_TLSLD
:
1042 if (info
->executable
)
1043 to_type
= R_X86_64_TPOFF32
;
1050 /* Return TRUE if there is no transition. */
1051 if (from_type
== to_type
)
1054 /* Check if the transition can be performed. */
1056 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1057 symtab_hdr
, sym_hashes
,
1058 from_type
, rel
, relend
))
1060 reloc_howto_type
*from
, *to
;
1063 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1064 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1067 name
= h
->root
.root
.string
;
1070 struct elf_x86_64_link_hash_table
*htab
;
1072 htab
= elf_x86_64_hash_table (info
);
1077 Elf_Internal_Sym
*isym
;
1079 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1081 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1085 (*_bfd_error_handler
)
1086 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1087 "in section `%A' failed"),
1088 abfd
, sec
, from
->name
, to
->name
, name
,
1089 (unsigned long) rel
->r_offset
);
1090 bfd_set_error (bfd_error_bad_value
);
1098 /* Look through the relocs for a section during the first phase, and
1099 calculate needed space in the global offset table, procedure
1100 linkage table, and dynamic reloc sections. */
1103 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1105 const Elf_Internal_Rela
*relocs
)
1107 struct elf_x86_64_link_hash_table
*htab
;
1108 Elf_Internal_Shdr
*symtab_hdr
;
1109 struct elf_link_hash_entry
**sym_hashes
;
1110 const Elf_Internal_Rela
*rel
;
1111 const Elf_Internal_Rela
*rel_end
;
1114 if (info
->relocatable
)
1117 BFD_ASSERT (is_x86_64_elf (abfd
));
1119 htab
= elf_x86_64_hash_table (info
);
1123 symtab_hdr
= &elf_symtab_hdr (abfd
);
1124 sym_hashes
= elf_sym_hashes (abfd
);
1128 rel_end
= relocs
+ sec
->reloc_count
;
1129 for (rel
= relocs
; rel
< rel_end
; rel
++)
1131 unsigned int r_type
;
1132 unsigned long r_symndx
;
1133 struct elf_link_hash_entry
*h
;
1134 Elf_Internal_Sym
*isym
;
1137 r_symndx
= htab
->r_sym (rel
->r_info
);
1138 r_type
= ELF32_R_TYPE (rel
->r_info
);
1140 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1142 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1147 if (r_symndx
< symtab_hdr
->sh_info
)
1149 /* A local symbol. */
1150 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1155 /* Check relocation against local STT_GNU_IFUNC symbol. */
1156 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1158 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1163 /* Fake a STT_GNU_IFUNC symbol. */
1164 h
->type
= STT_GNU_IFUNC
;
1167 h
->forced_local
= 1;
1168 h
->root
.type
= bfd_link_hash_defined
;
1176 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1177 while (h
->root
.type
== bfd_link_hash_indirect
1178 || h
->root
.type
== bfd_link_hash_warning
)
1179 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1184 /* Create the ifunc sections for static executables. If we
1185 never see an indirect function symbol nor we are building
1186 a static executable, those sections will be empty and
1187 won't appear in output. */
1198 case R_X86_64_PLT32
:
1199 case R_X86_64_GOTPCREL
:
1200 case R_X86_64_GOTPCREL64
:
1201 if (!_bfd_elf_create_ifunc_sections (abfd
, info
))
1206 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1207 it here if it is defined in a non-shared object. */
1208 if (h
->type
== STT_GNU_IFUNC
1211 /* It is referenced by a non-shared object. */
1215 /* STT_GNU_IFUNC symbol must go through PLT. */
1216 h
->plt
.refcount
+= 1;
1218 /* STT_GNU_IFUNC needs dynamic sections. */
1219 if (htab
->elf
.dynobj
== NULL
)
1220 htab
->elf
.dynobj
= abfd
;
1225 if (h
->root
.root
.string
)
1226 name
= h
->root
.root
.string
;
1228 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1230 (*_bfd_error_handler
)
1231 (_("%B: relocation %s against STT_GNU_IFUNC "
1232 "symbol `%s' isn't handled by %s"), abfd
,
1233 x86_64_elf_howto_table
[r_type
].name
,
1234 name
, __FUNCTION__
);
1235 bfd_set_error (bfd_error_bad_value
);
1240 h
->pointer_equality_needed
= 1;
1243 /* We must copy these reloc types into the output
1244 file. Create a reloc section in dynobj and
1245 make room for this reloc. */
1246 sreloc
= _bfd_elf_create_ifunc_dyn_reloc
1247 (abfd
, info
, sec
, sreloc
,
1248 &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
);
1259 if (r_type
!= R_X86_64_PC32
1260 && r_type
!= R_X86_64_PC64
)
1261 h
->pointer_equality_needed
= 1;
1264 case R_X86_64_PLT32
:
1267 case R_X86_64_GOTPCREL
:
1268 case R_X86_64_GOTPCREL64
:
1269 h
->got
.refcount
+= 1;
1270 if (htab
->elf
.sgot
== NULL
1271 && !_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1281 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1282 symtab_hdr
, sym_hashes
,
1283 &r_type
, GOT_UNKNOWN
,
1284 rel
, rel_end
, h
, r_symndx
))
1289 case R_X86_64_TLSLD
:
1290 htab
->tls_ld_got
.refcount
+= 1;
1293 case R_X86_64_TPOFF32
:
1294 if (!info
->executable
&& ABI_64_P (abfd
))
1297 name
= h
->root
.root
.string
;
1299 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1301 (*_bfd_error_handler
)
1302 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1304 x86_64_elf_howto_table
[r_type
].name
, name
);
1305 bfd_set_error (bfd_error_bad_value
);
1310 case R_X86_64_GOTTPOFF
:
1311 if (!info
->executable
)
1312 info
->flags
|= DF_STATIC_TLS
;
1315 case R_X86_64_GOT32
:
1316 case R_X86_64_GOTPCREL
:
1317 case R_X86_64_TLSGD
:
1318 case R_X86_64_GOT64
:
1319 case R_X86_64_GOTPCREL64
:
1320 case R_X86_64_GOTPLT64
:
1321 case R_X86_64_GOTPC32_TLSDESC
:
1322 case R_X86_64_TLSDESC_CALL
:
1323 /* This symbol requires a global offset table entry. */
1325 int tls_type
, old_tls_type
;
1329 default: tls_type
= GOT_NORMAL
; break;
1330 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1331 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1332 case R_X86_64_GOTPC32_TLSDESC
:
1333 case R_X86_64_TLSDESC_CALL
:
1334 tls_type
= GOT_TLS_GDESC
; break;
1339 if (r_type
== R_X86_64_GOTPLT64
)
1341 /* This relocation indicates that we also need
1342 a PLT entry, as this is a function. We don't need
1343 a PLT entry for local symbols. */
1345 h
->plt
.refcount
+= 1;
1347 h
->got
.refcount
+= 1;
1348 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1352 bfd_signed_vma
*local_got_refcounts
;
1354 /* This is a global offset table entry for a local symbol. */
1355 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1356 if (local_got_refcounts
== NULL
)
1360 size
= symtab_hdr
->sh_info
;
1361 size
*= sizeof (bfd_signed_vma
)
1362 + sizeof (bfd_vma
) + sizeof (char);
1363 local_got_refcounts
= ((bfd_signed_vma
*)
1364 bfd_zalloc (abfd
, size
));
1365 if (local_got_refcounts
== NULL
)
1367 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1368 elf_x86_64_local_tlsdesc_gotent (abfd
)
1369 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1370 elf_x86_64_local_got_tls_type (abfd
)
1371 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1373 local_got_refcounts
[r_symndx
] += 1;
1375 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1378 /* If a TLS symbol is accessed using IE at least once,
1379 there is no point to use dynamic model for it. */
1380 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1381 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1382 || tls_type
!= GOT_TLS_IE
))
1384 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1385 tls_type
= old_tls_type
;
1386 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1387 && GOT_TLS_GD_ANY_P (tls_type
))
1388 tls_type
|= old_tls_type
;
1392 name
= h
->root
.root
.string
;
1394 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1396 (*_bfd_error_handler
)
1397 (_("%B: '%s' accessed both as normal and thread local symbol"),
1403 if (old_tls_type
!= tls_type
)
1406 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1408 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1413 case R_X86_64_GOTOFF64
:
1414 case R_X86_64_GOTPC32
:
1415 case R_X86_64_GOTPC64
:
1417 if (htab
->elf
.sgot
== NULL
)
1419 if (htab
->elf
.dynobj
== NULL
)
1420 htab
->elf
.dynobj
= abfd
;
1421 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1427 case R_X86_64_PLT32
:
1428 /* This symbol requires a procedure linkage table entry. We
1429 actually build the entry in adjust_dynamic_symbol,
1430 because this might be a case of linking PIC code which is
1431 never referenced by a dynamic object, in which case we
1432 don't need to generate a procedure linkage table entry
1435 /* If this is a local symbol, we resolve it directly without
1436 creating a procedure linkage table entry. */
1441 h
->plt
.refcount
+= 1;
1444 case R_X86_64_PLTOFF64
:
1445 /* This tries to form the 'address' of a function relative
1446 to GOT. For global symbols we need a PLT entry. */
1450 h
->plt
.refcount
+= 1;
1458 /* Let's help debug shared library creation. These relocs
1459 cannot be used in shared libs. Don't error out for
1460 sections we don't care about, such as debug sections or
1461 non-constant sections. */
1464 && (sec
->flags
& SEC_ALLOC
) != 0
1465 && (sec
->flags
& SEC_READONLY
) != 0)
1468 name
= h
->root
.root
.string
;
1470 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1471 (*_bfd_error_handler
)
1472 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1473 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1474 bfd_set_error (bfd_error_bad_value
);
1484 if (h
!= NULL
&& info
->executable
)
1486 /* If this reloc is in a read-only section, we might
1487 need a copy reloc. We can't check reliably at this
1488 stage whether the section is read-only, as input
1489 sections have not yet been mapped to output sections.
1490 Tentatively set the flag for now, and correct in
1491 adjust_dynamic_symbol. */
1494 /* We may need a .plt entry if the function this reloc
1495 refers to is in a shared lib. */
1496 h
->plt
.refcount
+= 1;
1497 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1498 h
->pointer_equality_needed
= 1;
1501 /* If we are creating a shared library, and this is a reloc
1502 against a global symbol, or a non PC relative reloc
1503 against a local symbol, then we need to copy the reloc
1504 into the shared library. However, if we are linking with
1505 -Bsymbolic, we do not need to copy a reloc against a
1506 global symbol which is defined in an object we are
1507 including in the link (i.e., DEF_REGULAR is set). At
1508 this point we have not seen all the input files, so it is
1509 possible that DEF_REGULAR is not set now but will be set
1510 later (it is never cleared). In case of a weak definition,
1511 DEF_REGULAR may be cleared later by a strong definition in
1512 a shared library. We account for that possibility below by
1513 storing information in the relocs_copied field of the hash
1514 table entry. A similar situation occurs when creating
1515 shared libraries and symbol visibility changes render the
1518 If on the other hand, we are creating an executable, we
1519 may need to keep relocations for symbols satisfied by a
1520 dynamic library if we manage to avoid copy relocs for the
1523 && (sec
->flags
& SEC_ALLOC
) != 0
1524 && (! IS_X86_64_PCREL_TYPE (r_type
)
1526 && (! SYMBOLIC_BIND (info
, h
)
1527 || h
->root
.type
== bfd_link_hash_defweak
1528 || !h
->def_regular
))))
1529 || (ELIMINATE_COPY_RELOCS
1531 && (sec
->flags
& SEC_ALLOC
) != 0
1533 && (h
->root
.type
== bfd_link_hash_defweak
1534 || !h
->def_regular
)))
1536 struct elf_dyn_relocs
*p
;
1537 struct elf_dyn_relocs
**head
;
1539 /* We must copy these reloc types into the output file.
1540 Create a reloc section in dynobj and make room for
1544 if (htab
->elf
.dynobj
== NULL
)
1545 htab
->elf
.dynobj
= abfd
;
1547 sreloc
= _bfd_elf_make_dynamic_reloc_section
1548 (sec
, htab
->elf
.dynobj
, 3, abfd
, /*rela?*/ TRUE
);
1554 /* If this is a global symbol, we count the number of
1555 relocations we need for this symbol. */
1558 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1562 /* Track dynamic relocs needed for local syms too.
1563 We really need local syms available to do this
1568 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1573 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1577 /* Beware of type punned pointers vs strict aliasing
1579 vpp
= &(elf_section_data (s
)->local_dynrel
);
1580 head
= (struct elf_dyn_relocs
**)vpp
;
1584 if (p
== NULL
|| p
->sec
!= sec
)
1586 bfd_size_type amt
= sizeof *p
;
1588 p
= ((struct elf_dyn_relocs
*)
1589 bfd_alloc (htab
->elf
.dynobj
, amt
));
1600 if (IS_X86_64_PCREL_TYPE (r_type
))
1605 /* This relocation describes the C++ object vtable hierarchy.
1606 Reconstruct it for later use during GC. */
1607 case R_X86_64_GNU_VTINHERIT
:
1608 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1612 /* This relocation describes which C++ vtable entries are actually
1613 used. Record for later use during GC. */
1614 case R_X86_64_GNU_VTENTRY
:
1615 BFD_ASSERT (h
!= NULL
);
1617 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1629 /* Return the section that should be marked against GC for a given
1633 elf_x86_64_gc_mark_hook (asection
*sec
,
1634 struct bfd_link_info
*info
,
1635 Elf_Internal_Rela
*rel
,
1636 struct elf_link_hash_entry
*h
,
1637 Elf_Internal_Sym
*sym
)
1640 switch (ELF32_R_TYPE (rel
->r_info
))
1642 case R_X86_64_GNU_VTINHERIT
:
1643 case R_X86_64_GNU_VTENTRY
:
1647 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1650 /* Update the got entry reference counts for the section being removed. */
1653 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1655 const Elf_Internal_Rela
*relocs
)
1657 struct elf_x86_64_link_hash_table
*htab
;
1658 Elf_Internal_Shdr
*symtab_hdr
;
1659 struct elf_link_hash_entry
**sym_hashes
;
1660 bfd_signed_vma
*local_got_refcounts
;
1661 const Elf_Internal_Rela
*rel
, *relend
;
1663 if (info
->relocatable
)
1666 htab
= elf_x86_64_hash_table (info
);
1670 elf_section_data (sec
)->local_dynrel
= NULL
;
1672 symtab_hdr
= &elf_symtab_hdr (abfd
);
1673 sym_hashes
= elf_sym_hashes (abfd
);
1674 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1676 htab
= elf_x86_64_hash_table (info
);
1677 relend
= relocs
+ sec
->reloc_count
;
1678 for (rel
= relocs
; rel
< relend
; rel
++)
1680 unsigned long r_symndx
;
1681 unsigned int r_type
;
1682 struct elf_link_hash_entry
*h
= NULL
;
1684 r_symndx
= htab
->r_sym (rel
->r_info
);
1685 if (r_symndx
>= symtab_hdr
->sh_info
)
1687 struct elf_x86_64_link_hash_entry
*eh
;
1688 struct elf_dyn_relocs
**pp
;
1689 struct elf_dyn_relocs
*p
;
1691 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1692 while (h
->root
.type
== bfd_link_hash_indirect
1693 || h
->root
.type
== bfd_link_hash_warning
)
1694 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1695 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
1697 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1700 /* Everything must go for SEC. */
1707 /* A local symbol. */
1708 Elf_Internal_Sym
*isym
;
1710 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1713 /* Check relocation against local STT_GNU_IFUNC symbol. */
1715 && ELF64_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1717 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
1723 r_type
= ELF32_R_TYPE (rel
->r_info
);
1724 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1725 symtab_hdr
, sym_hashes
,
1726 &r_type
, GOT_UNKNOWN
,
1727 rel
, relend
, h
, r_symndx
))
1732 case R_X86_64_TLSLD
:
1733 if (htab
->tls_ld_got
.refcount
> 0)
1734 htab
->tls_ld_got
.refcount
-= 1;
1737 case R_X86_64_TLSGD
:
1738 case R_X86_64_GOTPC32_TLSDESC
:
1739 case R_X86_64_TLSDESC_CALL
:
1740 case R_X86_64_GOTTPOFF
:
1741 case R_X86_64_GOT32
:
1742 case R_X86_64_GOTPCREL
:
1743 case R_X86_64_GOT64
:
1744 case R_X86_64_GOTPCREL64
:
1745 case R_X86_64_GOTPLT64
:
1748 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1749 h
->plt
.refcount
-= 1;
1750 if (h
->got
.refcount
> 0)
1751 h
->got
.refcount
-= 1;
1752 if (h
->type
== STT_GNU_IFUNC
)
1754 if (h
->plt
.refcount
> 0)
1755 h
->plt
.refcount
-= 1;
1758 else if (local_got_refcounts
!= NULL
)
1760 if (local_got_refcounts
[r_symndx
] > 0)
1761 local_got_refcounts
[r_symndx
] -= 1;
1778 case R_X86_64_PLT32
:
1779 case R_X86_64_PLTOFF64
:
1782 if (h
->plt
.refcount
> 0)
1783 h
->plt
.refcount
-= 1;
1795 /* Adjust a symbol defined by a dynamic object and referenced by a
1796 regular object. The current definition is in some section of the
1797 dynamic object, but we're not including those sections. We have to
1798 change the definition to something the rest of the link can
1802 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1803 struct elf_link_hash_entry
*h
)
1805 struct elf_x86_64_link_hash_table
*htab
;
1808 /* STT_GNU_IFUNC symbol must go through PLT. */
1809 if (h
->type
== STT_GNU_IFUNC
)
1811 if (h
->plt
.refcount
<= 0)
1813 h
->plt
.offset
= (bfd_vma
) -1;
1819 /* If this is a function, put it in the procedure linkage table. We
1820 will fill in the contents of the procedure linkage table later,
1821 when we know the address of the .got section. */
1822 if (h
->type
== STT_FUNC
1825 if (h
->plt
.refcount
<= 0
1826 || SYMBOL_CALLS_LOCAL (info
, h
)
1827 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1828 && h
->root
.type
== bfd_link_hash_undefweak
))
1830 /* This case can occur if we saw a PLT32 reloc in an input
1831 file, but the symbol was never referred to by a dynamic
1832 object, or if all references were garbage collected. In
1833 such a case, we don't actually need to build a procedure
1834 linkage table, and we can just do a PC32 reloc instead. */
1835 h
->plt
.offset
= (bfd_vma
) -1;
1842 /* It's possible that we incorrectly decided a .plt reloc was
1843 needed for an R_X86_64_PC32 reloc to a non-function sym in
1844 check_relocs. We can't decide accurately between function and
1845 non-function syms in check-relocs; Objects loaded later in
1846 the link may change h->type. So fix it now. */
1847 h
->plt
.offset
= (bfd_vma
) -1;
1849 /* If this is a weak symbol, and there is a real definition, the
1850 processor independent code will have arranged for us to see the
1851 real definition first, and we can just use the same value. */
1852 if (h
->u
.weakdef
!= NULL
)
1854 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1855 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1856 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1857 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1858 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1859 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1863 /* This is a reference to a symbol defined by a dynamic object which
1864 is not a function. */
1866 /* If we are creating a shared library, we must presume that the
1867 only references to the symbol are via the global offset table.
1868 For such cases we need not do anything here; the relocations will
1869 be handled correctly by relocate_section. */
1873 /* If there are no references to this symbol that do not use the
1874 GOT, we don't need to generate a copy reloc. */
1875 if (!h
->non_got_ref
)
1878 /* If -z nocopyreloc was given, we won't generate them either. */
1879 if (info
->nocopyreloc
)
1885 if (ELIMINATE_COPY_RELOCS
)
1887 struct elf_x86_64_link_hash_entry
* eh
;
1888 struct elf_dyn_relocs
*p
;
1890 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
1891 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1893 s
= p
->sec
->output_section
;
1894 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1898 /* If we didn't find any dynamic relocs in read-only sections, then
1899 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1909 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1910 h
->root
.root
.string
);
1914 /* We must allocate the symbol in our .dynbss section, which will
1915 become part of the .bss section of the executable. There will be
1916 an entry for this symbol in the .dynsym section. The dynamic
1917 object will contain position independent code, so all references
1918 from the dynamic object to this symbol will go through the global
1919 offset table. The dynamic linker will use the .dynsym entry to
1920 determine the address it must put in the global offset table, so
1921 both the dynamic object and the regular object will refer to the
1922 same memory location for the variable. */
1924 htab
= elf_x86_64_hash_table (info
);
1928 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1929 to copy the initial value out of the dynamic object and into the
1930 runtime process image. */
1931 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1933 const struct elf_backend_data
*bed
;
1934 bed
= get_elf_backend_data (info
->output_bfd
);
1935 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
1941 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1944 /* Allocate space in .plt, .got and associated reloc sections for
1948 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1950 struct bfd_link_info
*info
;
1951 struct elf_x86_64_link_hash_table
*htab
;
1952 struct elf_x86_64_link_hash_entry
*eh
;
1953 struct elf_dyn_relocs
*p
;
1954 const struct elf_backend_data
*bed
;
1956 if (h
->root
.type
== bfd_link_hash_indirect
)
1959 if (h
->root
.type
== bfd_link_hash_warning
)
1960 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1961 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
1963 info
= (struct bfd_link_info
*) inf
;
1964 htab
= elf_x86_64_hash_table (info
);
1967 bed
= get_elf_backend_data (info
->output_bfd
);
1969 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1970 here if it is defined and referenced in a non-shared object. */
1971 if (h
->type
== STT_GNU_IFUNC
1973 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
1977 else if (htab
->elf
.dynamic_sections_created
1978 && h
->plt
.refcount
> 0)
1980 /* Make sure this symbol is output as a dynamic symbol.
1981 Undefined weak syms won't yet be marked as dynamic. */
1982 if (h
->dynindx
== -1
1983 && !h
->forced_local
)
1985 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1990 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1992 asection
*s
= htab
->elf
.splt
;
1994 /* If this is the first .plt entry, make room for the special
1997 s
->size
+= PLT_ENTRY_SIZE
;
1999 h
->plt
.offset
= s
->size
;
2001 /* If this symbol is not defined in a regular file, and we are
2002 not generating a shared library, then set the symbol to this
2003 location in the .plt. This is required to make function
2004 pointers compare as equal between the normal executable and
2005 the shared library. */
2009 h
->root
.u
.def
.section
= s
;
2010 h
->root
.u
.def
.value
= h
->plt
.offset
;
2013 /* Make room for this entry. */
2014 s
->size
+= PLT_ENTRY_SIZE
;
2016 /* We also need to make an entry in the .got.plt section, which
2017 will be placed in the .got section by the linker script. */
2018 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2020 /* We also need to make an entry in the .rela.plt section. */
2021 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2022 htab
->elf
.srelplt
->reloc_count
++;
2026 h
->plt
.offset
= (bfd_vma
) -1;
2032 h
->plt
.offset
= (bfd_vma
) -1;
2036 eh
->tlsdesc_got
= (bfd_vma
) -1;
2038 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2039 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2040 if (h
->got
.refcount
> 0
2043 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2045 h
->got
.offset
= (bfd_vma
) -1;
2047 else if (h
->got
.refcount
> 0)
2051 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2053 /* Make sure this symbol is output as a dynamic symbol.
2054 Undefined weak syms won't yet be marked as dynamic. */
2055 if (h
->dynindx
== -1
2056 && !h
->forced_local
)
2058 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2062 if (GOT_TLS_GDESC_P (tls_type
))
2064 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2065 - elf_x86_64_compute_jump_table_size (htab
);
2066 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2067 h
->got
.offset
= (bfd_vma
) -2;
2069 if (! GOT_TLS_GDESC_P (tls_type
)
2070 || GOT_TLS_GD_P (tls_type
))
2073 h
->got
.offset
= s
->size
;
2074 s
->size
+= GOT_ENTRY_SIZE
;
2075 if (GOT_TLS_GD_P (tls_type
))
2076 s
->size
+= GOT_ENTRY_SIZE
;
2078 dyn
= htab
->elf
.dynamic_sections_created
;
2079 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2081 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2082 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2083 || tls_type
== GOT_TLS_IE
)
2084 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2085 else if (GOT_TLS_GD_P (tls_type
))
2086 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2087 else if (! GOT_TLS_GDESC_P (tls_type
)
2088 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2089 || h
->root
.type
!= bfd_link_hash_undefweak
)
2091 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2092 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2093 if (GOT_TLS_GDESC_P (tls_type
))
2095 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2096 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2100 h
->got
.offset
= (bfd_vma
) -1;
2102 if (eh
->dyn_relocs
== NULL
)
2105 /* In the shared -Bsymbolic case, discard space allocated for
2106 dynamic pc-relative relocs against symbols which turn out to be
2107 defined in regular objects. For the normal shared case, discard
2108 space for pc-relative relocs that have become local due to symbol
2109 visibility changes. */
2113 /* Relocs that use pc_count are those that appear on a call
2114 insn, or certain REL relocs that can generated via assembly.
2115 We want calls to protected symbols to resolve directly to the
2116 function rather than going via the plt. If people want
2117 function pointer comparisons to work as expected then they
2118 should avoid writing weird assembly. */
2119 if (SYMBOL_CALLS_LOCAL (info
, h
))
2121 struct elf_dyn_relocs
**pp
;
2123 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2125 p
->count
-= p
->pc_count
;
2134 /* Also discard relocs on undefined weak syms with non-default
2136 if (eh
->dyn_relocs
!= NULL
2137 && h
->root
.type
== bfd_link_hash_undefweak
)
2139 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2140 eh
->dyn_relocs
= NULL
;
2142 /* Make sure undefined weak symbols are output as a dynamic
2144 else if (h
->dynindx
== -1
2145 && ! h
->forced_local
2146 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2151 else if (ELIMINATE_COPY_RELOCS
)
2153 /* For the non-shared case, discard space for relocs against
2154 symbols which turn out to need copy relocs or are not
2160 || (htab
->elf
.dynamic_sections_created
2161 && (h
->root
.type
== bfd_link_hash_undefweak
2162 || h
->root
.type
== bfd_link_hash_undefined
))))
2164 /* Make sure this symbol is output as a dynamic symbol.
2165 Undefined weak syms won't yet be marked as dynamic. */
2166 if (h
->dynindx
== -1
2167 && ! h
->forced_local
2168 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2171 /* If that succeeded, we know we'll be keeping all the
2173 if (h
->dynindx
!= -1)
2177 eh
->dyn_relocs
= NULL
;
2182 /* Finally, allocate space. */
2183 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2187 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2189 BFD_ASSERT (sreloc
!= NULL
);
2191 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2197 /* Allocate space in .plt, .got and associated reloc sections for
2198 local dynamic relocs. */
2201 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2203 struct elf_link_hash_entry
*h
2204 = (struct elf_link_hash_entry
*) *slot
;
2206 if (h
->type
!= STT_GNU_IFUNC
2210 || h
->root
.type
!= bfd_link_hash_defined
)
2213 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2216 /* Find any dynamic relocs that apply to read-only sections. */
2219 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2222 struct elf_x86_64_link_hash_entry
*eh
;
2223 struct elf_dyn_relocs
*p
;
2225 if (h
->root
.type
== bfd_link_hash_warning
)
2226 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2228 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2229 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2231 asection
*s
= p
->sec
->output_section
;
2233 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2235 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2237 info
->flags
|= DF_TEXTREL
;
2239 /* Not an error, just cut short the traversal. */
2246 /* Set the sizes of the dynamic sections. */
2249 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
2250 struct bfd_link_info
*info
)
2252 struct elf_x86_64_link_hash_table
*htab
;
2257 const struct elf_backend_data
*bed
;
2259 htab
= elf_x86_64_hash_table (info
);
2262 bed
= get_elf_backend_data (output_bfd
);
2264 dynobj
= htab
->elf
.dynobj
;
2268 if (htab
->elf
.dynamic_sections_created
)
2270 /* Set the contents of the .interp section to the interpreter. */
2271 if (info
->executable
)
2273 s
= bfd_get_section_by_name (dynobj
, ".interp");
2276 s
->size
= htab
->dynamic_interpreter_size
;
2277 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2281 /* Set up .got offsets for local syms, and space for local dynamic
2283 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2285 bfd_signed_vma
*local_got
;
2286 bfd_signed_vma
*end_local_got
;
2287 char *local_tls_type
;
2288 bfd_vma
*local_tlsdesc_gotent
;
2289 bfd_size_type locsymcount
;
2290 Elf_Internal_Shdr
*symtab_hdr
;
2293 if (! is_x86_64_elf (ibfd
))
2296 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2298 struct elf_dyn_relocs
*p
;
2300 for (p
= (struct elf_dyn_relocs
*)
2301 (elf_section_data (s
)->local_dynrel
);
2305 if (!bfd_is_abs_section (p
->sec
)
2306 && bfd_is_abs_section (p
->sec
->output_section
))
2308 /* Input section has been discarded, either because
2309 it is a copy of a linkonce section or due to
2310 linker script /DISCARD/, so we'll be discarding
2313 else if (p
->count
!= 0)
2315 srel
= elf_section_data (p
->sec
)->sreloc
;
2316 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2317 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2318 info
->flags
|= DF_TEXTREL
;
2323 local_got
= elf_local_got_refcounts (ibfd
);
2327 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2328 locsymcount
= symtab_hdr
->sh_info
;
2329 end_local_got
= local_got
+ locsymcount
;
2330 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
2331 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
2333 srel
= htab
->elf
.srelgot
;
2334 for (; local_got
< end_local_got
;
2335 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2337 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2340 if (GOT_TLS_GDESC_P (*local_tls_type
))
2342 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2343 - elf_x86_64_compute_jump_table_size (htab
);
2344 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2345 *local_got
= (bfd_vma
) -2;
2347 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2348 || GOT_TLS_GD_P (*local_tls_type
))
2350 *local_got
= s
->size
;
2351 s
->size
+= GOT_ENTRY_SIZE
;
2352 if (GOT_TLS_GD_P (*local_tls_type
))
2353 s
->size
+= GOT_ENTRY_SIZE
;
2356 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2357 || *local_tls_type
== GOT_TLS_IE
)
2359 if (GOT_TLS_GDESC_P (*local_tls_type
))
2361 htab
->elf
.srelplt
->size
2362 += bed
->s
->sizeof_rela
;
2363 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2365 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2366 || GOT_TLS_GD_P (*local_tls_type
))
2367 srel
->size
+= bed
->s
->sizeof_rela
;
2371 *local_got
= (bfd_vma
) -1;
2375 if (htab
->tls_ld_got
.refcount
> 0)
2377 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2379 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2380 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2381 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2384 htab
->tls_ld_got
.offset
= -1;
2386 /* Allocate global sym .plt and .got entries, and space for global
2387 sym dynamic relocs. */
2388 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
2391 /* Allocate .plt and .got entries, and space for local symbols. */
2392 htab_traverse (htab
->loc_hash_table
,
2393 elf_x86_64_allocate_local_dynrelocs
,
2396 /* For every jump slot reserved in the sgotplt, reloc_count is
2397 incremented. However, when we reserve space for TLS descriptors,
2398 it's not incremented, so in order to compute the space reserved
2399 for them, it suffices to multiply the reloc count by the jump
2401 if (htab
->elf
.srelplt
)
2402 htab
->sgotplt_jump_table_size
2403 = elf_x86_64_compute_jump_table_size (htab
);
2405 if (htab
->tlsdesc_plt
)
2407 /* If we're not using lazy TLS relocations, don't generate the
2408 PLT and GOT entries they require. */
2409 if ((info
->flags
& DF_BIND_NOW
))
2410 htab
->tlsdesc_plt
= 0;
2413 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2414 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2415 /* Reserve room for the initial entry.
2416 FIXME: we could probably do away with it in this case. */
2417 if (htab
->elf
.splt
->size
== 0)
2418 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2419 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2420 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2424 if (htab
->elf
.sgotplt
)
2426 struct elf_link_hash_entry
*got
;
2427 got
= elf_link_hash_lookup (elf_hash_table (info
),
2428 "_GLOBAL_OFFSET_TABLE_",
2429 FALSE
, FALSE
, FALSE
);
2431 /* Don't allocate .got.plt section if there are no GOT nor PLT
2432 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2434 || !got
->ref_regular_nonweak
)
2435 && (htab
->elf
.sgotplt
->size
2436 == get_elf_backend_data (output_bfd
)->got_header_size
)
2437 && (htab
->elf
.splt
== NULL
2438 || htab
->elf
.splt
->size
== 0)
2439 && (htab
->elf
.sgot
== NULL
2440 || htab
->elf
.sgot
->size
== 0)
2441 && (htab
->elf
.iplt
== NULL
2442 || htab
->elf
.iplt
->size
== 0)
2443 && (htab
->elf
.igotplt
== NULL
2444 || htab
->elf
.igotplt
->size
== 0))
2445 htab
->elf
.sgotplt
->size
= 0;
2448 /* We now have determined the sizes of the various dynamic sections.
2449 Allocate memory for them. */
2451 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2453 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2456 if (s
== htab
->elf
.splt
2457 || s
== htab
->elf
.sgot
2458 || s
== htab
->elf
.sgotplt
2459 || s
== htab
->elf
.iplt
2460 || s
== htab
->elf
.igotplt
2461 || s
== htab
->sdynbss
)
2463 /* Strip this section if we don't need it; see the
2466 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2468 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2471 /* We use the reloc_count field as a counter if we need
2472 to copy relocs into the output file. */
2473 if (s
!= htab
->elf
.srelplt
)
2478 /* It's not one of our sections, so don't allocate space. */
2484 /* If we don't need this section, strip it from the
2485 output file. This is mostly to handle .rela.bss and
2486 .rela.plt. We must create both sections in
2487 create_dynamic_sections, because they must be created
2488 before the linker maps input sections to output
2489 sections. The linker does that before
2490 adjust_dynamic_symbol is called, and it is that
2491 function which decides whether anything needs to go
2492 into these sections. */
2494 s
->flags
|= SEC_EXCLUDE
;
2498 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2501 /* Allocate memory for the section contents. We use bfd_zalloc
2502 here in case unused entries are not reclaimed before the
2503 section's contents are written out. This should not happen,
2504 but this way if it does, we get a R_X86_64_NONE reloc instead
2506 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2507 if (s
->contents
== NULL
)
2511 if (htab
->elf
.dynamic_sections_created
)
2513 /* Add some entries to the .dynamic section. We fill in the
2514 values later, in elf_x86_64_finish_dynamic_sections, but we
2515 must add the entries now so that we get the correct size for
2516 the .dynamic section. The DT_DEBUG entry is filled in by the
2517 dynamic linker and used by the debugger. */
2518 #define add_dynamic_entry(TAG, VAL) \
2519 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2521 if (info
->executable
)
2523 if (!add_dynamic_entry (DT_DEBUG
, 0))
2527 if (htab
->elf
.splt
->size
!= 0)
2529 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2530 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2531 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2532 || !add_dynamic_entry (DT_JMPREL
, 0))
2535 if (htab
->tlsdesc_plt
2536 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2537 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2543 if (!add_dynamic_entry (DT_RELA
, 0)
2544 || !add_dynamic_entry (DT_RELASZ
, 0)
2545 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
2548 /* If any dynamic relocs apply to a read-only section,
2549 then we need a DT_TEXTREL entry. */
2550 if ((info
->flags
& DF_TEXTREL
) == 0)
2551 elf_link_hash_traverse (&htab
->elf
,
2552 elf_x86_64_readonly_dynrelocs
,
2555 if ((info
->flags
& DF_TEXTREL
) != 0)
2557 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2562 #undef add_dynamic_entry
2568 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2569 struct bfd_link_info
*info
)
2571 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2575 struct elf_link_hash_entry
*tlsbase
;
2577 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2578 "_TLS_MODULE_BASE_",
2579 FALSE
, FALSE
, FALSE
);
2581 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2583 struct elf_x86_64_link_hash_table
*htab
;
2584 struct bfd_link_hash_entry
*bh
= NULL
;
2585 const struct elf_backend_data
*bed
2586 = get_elf_backend_data (output_bfd
);
2588 htab
= elf_x86_64_hash_table (info
);
2592 if (!(_bfd_generic_link_add_one_symbol
2593 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2594 tls_sec
, 0, NULL
, FALSE
,
2595 bed
->collect
, &bh
)))
2598 htab
->tls_module_base
= bh
;
2600 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2601 tlsbase
->def_regular
= 1;
2602 tlsbase
->other
= STV_HIDDEN
;
2603 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2610 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2611 executables. Rather than setting it to the beginning of the TLS
2612 section, we have to set it to the end. This function may be called
2613 multiple times, it is idempotent. */
2616 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2618 struct elf_x86_64_link_hash_table
*htab
;
2619 struct bfd_link_hash_entry
*base
;
2621 if (!info
->executable
)
2624 htab
= elf_x86_64_hash_table (info
);
2628 base
= htab
->tls_module_base
;
2632 base
->u
.def
.value
= htab
->elf
.tls_size
;
2635 /* Return the base VMA address which should be subtracted from real addresses
2636 when resolving @dtpoff relocation.
2637 This is PT_TLS segment p_vaddr. */
2640 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2642 /* If tls_sec is NULL, we should have signalled an error already. */
2643 if (elf_hash_table (info
)->tls_sec
== NULL
)
2645 return elf_hash_table (info
)->tls_sec
->vma
;
2648 /* Return the relocation value for @tpoff relocation
2649 if STT_TLS virtual address is ADDRESS. */
2652 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2654 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2655 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2656 bfd_vma static_tls_size
;
2658 /* If tls_segment is NULL, we should have signalled an error already. */
2659 if (htab
->tls_sec
== NULL
)
2662 /* Consider special static TLS alignment requirements. */
2663 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2664 return address
- static_tls_size
- htab
->tls_sec
->vma
;
2667 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2671 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2673 /* Opcode Instruction
2676 0x0f 0x8x conditional jump */
2678 && (contents
[offset
- 1] == 0xe8
2679 || contents
[offset
- 1] == 0xe9))
2681 && contents
[offset
- 2] == 0x0f
2682 && (contents
[offset
- 1] & 0xf0) == 0x80));
2685 /* Relocate an x86_64 ELF section. */
2688 elf_x86_64_relocate_section (bfd
*output_bfd
,
2689 struct bfd_link_info
*info
,
2691 asection
*input_section
,
2693 Elf_Internal_Rela
*relocs
,
2694 Elf_Internal_Sym
*local_syms
,
2695 asection
**local_sections
)
2697 struct elf_x86_64_link_hash_table
*htab
;
2698 Elf_Internal_Shdr
*symtab_hdr
;
2699 struct elf_link_hash_entry
**sym_hashes
;
2700 bfd_vma
*local_got_offsets
;
2701 bfd_vma
*local_tlsdesc_gotents
;
2702 Elf_Internal_Rela
*rel
;
2703 Elf_Internal_Rela
*relend
;
2705 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2707 htab
= elf_x86_64_hash_table (info
);
2710 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2711 sym_hashes
= elf_sym_hashes (input_bfd
);
2712 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2713 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
2715 elf_x86_64_set_tls_module_base (info
);
2718 relend
= relocs
+ input_section
->reloc_count
;
2719 for (; rel
< relend
; rel
++)
2721 unsigned int r_type
;
2722 reloc_howto_type
*howto
;
2723 unsigned long r_symndx
;
2724 struct elf_link_hash_entry
*h
;
2725 Elf_Internal_Sym
*sym
;
2727 bfd_vma off
, offplt
;
2729 bfd_boolean unresolved_reloc
;
2730 bfd_reloc_status_type r
;
2734 r_type
= ELF32_R_TYPE (rel
->r_info
);
2735 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2736 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2739 if (r_type
>= R_X86_64_max
)
2741 bfd_set_error (bfd_error_bad_value
);
2745 howto
= x86_64_elf_howto_table
+ r_type
;
2746 r_symndx
= htab
->r_sym (rel
->r_info
);
2750 unresolved_reloc
= FALSE
;
2751 if (r_symndx
< symtab_hdr
->sh_info
)
2753 sym
= local_syms
+ r_symndx
;
2754 sec
= local_sections
[r_symndx
];
2756 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2759 /* Relocate against local STT_GNU_IFUNC symbol. */
2760 if (!info
->relocatable
2761 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2763 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
2768 /* Set STT_GNU_IFUNC symbol value. */
2769 h
->root
.u
.def
.value
= sym
->st_value
;
2770 h
->root
.u
.def
.section
= sec
;
2775 bfd_boolean warned ATTRIBUTE_UNUSED
;
2777 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2778 r_symndx
, symtab_hdr
, sym_hashes
,
2780 unresolved_reloc
, warned
);
2783 if (sec
!= NULL
&& elf_discarded_section (sec
))
2784 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2785 rel
, relend
, howto
, contents
);
2787 if (info
->relocatable
)
2790 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2791 it here if it is defined in a non-shared object. */
2793 && h
->type
== STT_GNU_IFUNC
2800 if ((input_section
->flags
& SEC_ALLOC
) == 0
2801 || h
->plt
.offset
== (bfd_vma
) -1)
2804 /* STT_GNU_IFUNC symbol must go through PLT. */
2805 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
2806 relocation
= (plt
->output_section
->vma
2807 + plt
->output_offset
+ h
->plt
.offset
);
2812 if (h
->root
.root
.string
)
2813 name
= h
->root
.root
.string
;
2815 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2817 (*_bfd_error_handler
)
2818 (_("%B: relocation %s against STT_GNU_IFUNC "
2819 "symbol `%s' isn't handled by %s"), input_bfd
,
2820 x86_64_elf_howto_table
[r_type
].name
,
2821 name
, __FUNCTION__
);
2822 bfd_set_error (bfd_error_bad_value
);
2831 if (rel
->r_addend
!= 0)
2833 if (h
->root
.root
.string
)
2834 name
= h
->root
.root
.string
;
2836 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2838 (*_bfd_error_handler
)
2839 (_("%B: relocation %s against STT_GNU_IFUNC "
2840 "symbol `%s' has non-zero addend: %d"),
2841 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2842 name
, rel
->r_addend
);
2843 bfd_set_error (bfd_error_bad_value
);
2847 /* Generate dynamic relcoation only when there is a
2848 non-GOF reference in a shared object. */
2849 if (info
->shared
&& h
->non_got_ref
)
2851 Elf_Internal_Rela outrel
;
2854 /* Need a dynamic relocation to get the real function
2856 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2860 if (outrel
.r_offset
== (bfd_vma
) -1
2861 || outrel
.r_offset
== (bfd_vma
) -2)
2864 outrel
.r_offset
+= (input_section
->output_section
->vma
2865 + input_section
->output_offset
);
2867 if (h
->dynindx
== -1
2869 || info
->executable
)
2871 /* This symbol is resolved locally. */
2872 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
2873 outrel
.r_addend
= (h
->root
.u
.def
.value
2874 + h
->root
.u
.def
.section
->output_section
->vma
2875 + h
->root
.u
.def
.section
->output_offset
);
2879 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
2880 outrel
.r_addend
= 0;
2883 sreloc
= htab
->elf
.irelifunc
;
2884 elf_append_rela (output_bfd
, sreloc
, &outrel
);
2886 /* If this reloc is against an external symbol, we
2887 do not want to fiddle with the addend. Otherwise,
2888 we need to include the symbol value so that it
2889 becomes an addend for the dynamic reloc. For an
2890 internal symbol, we have updated addend. */
2897 case R_X86_64_PLT32
:
2900 case R_X86_64_GOTPCREL
:
2901 case R_X86_64_GOTPCREL64
:
2902 base_got
= htab
->elf
.sgot
;
2903 off
= h
->got
.offset
;
2905 if (base_got
== NULL
)
2908 if (off
== (bfd_vma
) -1)
2910 /* We can't use h->got.offset here to save state, or
2911 even just remember the offset, as finish_dynamic_symbol
2912 would use that as offset into .got. */
2914 if (htab
->elf
.splt
!= NULL
)
2916 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2917 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2918 base_got
= htab
->elf
.sgotplt
;
2922 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
2923 off
= plt_index
* GOT_ENTRY_SIZE
;
2924 base_got
= htab
->elf
.igotplt
;
2927 if (h
->dynindx
== -1
2931 /* This references the local defitionion. We must
2932 initialize this entry in the global offset table.
2933 Since the offset must always be a multiple of 8,
2934 we use the least significant bit to record
2935 whether we have initialized it already.
2937 When doing a dynamic link, we create a .rela.got
2938 relocation entry to initialize the value. This
2939 is done in the finish_dynamic_symbol routine. */
2944 bfd_put_64 (output_bfd
, relocation
,
2945 base_got
->contents
+ off
);
2946 /* Note that this is harmless for the GOTPLT64
2947 case, as -1 | 1 still is -1. */
2953 relocation
= (base_got
->output_section
->vma
2954 + base_got
->output_offset
+ off
);
2956 if (r_type
!= R_X86_64_GOTPCREL
2957 && r_type
!= R_X86_64_GOTPCREL64
)
2960 if (htab
->elf
.splt
!= NULL
)
2961 gotplt
= htab
->elf
.sgotplt
;
2963 gotplt
= htab
->elf
.igotplt
;
2964 relocation
-= (gotplt
->output_section
->vma
2965 - gotplt
->output_offset
);
2972 /* When generating a shared object, the relocations handled here are
2973 copied into the output file to be resolved at run time. */
2976 case R_X86_64_GOT32
:
2977 case R_X86_64_GOT64
:
2978 /* Relocation is to the entry for this symbol in the global
2980 case R_X86_64_GOTPCREL
:
2981 case R_X86_64_GOTPCREL64
:
2982 /* Use global offset table entry as symbol value. */
2983 case R_X86_64_GOTPLT64
:
2984 /* This is the same as GOT64 for relocation purposes, but
2985 indicates the existence of a PLT entry. The difficulty is,
2986 that we must calculate the GOT slot offset from the PLT
2987 offset, if this symbol got a PLT entry (it was global).
2988 Additionally if it's computed from the PLT entry, then that
2989 GOT offset is relative to .got.plt, not to .got. */
2990 base_got
= htab
->elf
.sgot
;
2992 if (htab
->elf
.sgot
== NULL
)
2999 off
= h
->got
.offset
;
3001 && h
->plt
.offset
!= (bfd_vma
)-1
3002 && off
== (bfd_vma
)-1)
3004 /* We can't use h->got.offset here to save
3005 state, or even just remember the offset, as
3006 finish_dynamic_symbol would use that as offset into
3008 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3009 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3010 base_got
= htab
->elf
.sgotplt
;
3013 dyn
= htab
->elf
.dynamic_sections_created
;
3015 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3017 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3018 || (ELF_ST_VISIBILITY (h
->other
)
3019 && h
->root
.type
== bfd_link_hash_undefweak
))
3021 /* This is actually a static link, or it is a -Bsymbolic
3022 link and the symbol is defined locally, or the symbol
3023 was forced to be local because of a version file. We
3024 must initialize this entry in the global offset table.
3025 Since the offset must always be a multiple of 8, we
3026 use the least significant bit to record whether we
3027 have initialized it already.
3029 When doing a dynamic link, we create a .rela.got
3030 relocation entry to initialize the value. This is
3031 done in the finish_dynamic_symbol routine. */
3036 bfd_put_64 (output_bfd
, relocation
,
3037 base_got
->contents
+ off
);
3038 /* Note that this is harmless for the GOTPLT64 case,
3039 as -1 | 1 still is -1. */
3044 unresolved_reloc
= FALSE
;
3048 if (local_got_offsets
== NULL
)
3051 off
= local_got_offsets
[r_symndx
];
3053 /* The offset must always be a multiple of 8. We use
3054 the least significant bit to record whether we have
3055 already generated the necessary reloc. */
3060 bfd_put_64 (output_bfd
, relocation
,
3061 base_got
->contents
+ off
);
3066 Elf_Internal_Rela outrel
;
3068 /* We need to generate a R_X86_64_RELATIVE reloc
3069 for the dynamic linker. */
3070 s
= htab
->elf
.srelgot
;
3074 outrel
.r_offset
= (base_got
->output_section
->vma
3075 + base_got
->output_offset
3077 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3078 outrel
.r_addend
= relocation
;
3079 elf_append_rela (output_bfd
, s
, &outrel
);
3082 local_got_offsets
[r_symndx
] |= 1;
3086 if (off
>= (bfd_vma
) -2)
3089 relocation
= base_got
->output_section
->vma
3090 + base_got
->output_offset
+ off
;
3091 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3092 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3093 - htab
->elf
.sgotplt
->output_offset
;
3097 case R_X86_64_GOTOFF64
:
3098 /* Relocation is relative to the start of the global offset
3101 /* Check to make sure it isn't a protected function symbol
3102 for shared library since it may not be local when used
3103 as function address. */
3107 && h
->type
== STT_FUNC
3108 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3110 (*_bfd_error_handler
)
3111 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3112 input_bfd
, h
->root
.root
.string
);
3113 bfd_set_error (bfd_error_bad_value
);
3117 /* Note that sgot is not involved in this
3118 calculation. We always want the start of .got.plt. If we
3119 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3120 permitted by the ABI, we might have to change this
3122 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3123 + htab
->elf
.sgotplt
->output_offset
;
3126 case R_X86_64_GOTPC32
:
3127 case R_X86_64_GOTPC64
:
3128 /* Use global offset table as symbol value. */
3129 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3130 + htab
->elf
.sgotplt
->output_offset
;
3131 unresolved_reloc
= FALSE
;
3134 case R_X86_64_PLTOFF64
:
3135 /* Relocation is PLT entry relative to GOT. For local
3136 symbols it's the symbol itself relative to GOT. */
3138 /* See PLT32 handling. */
3139 && h
->plt
.offset
!= (bfd_vma
) -1
3140 && htab
->elf
.splt
!= NULL
)
3142 relocation
= (htab
->elf
.splt
->output_section
->vma
3143 + htab
->elf
.splt
->output_offset
3145 unresolved_reloc
= FALSE
;
3148 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3149 + htab
->elf
.sgotplt
->output_offset
;
3152 case R_X86_64_PLT32
:
3153 /* Relocation is to the entry for this symbol in the
3154 procedure linkage table. */
3156 /* Resolve a PLT32 reloc against a local symbol directly,
3157 without using the procedure linkage table. */
3161 if (h
->plt
.offset
== (bfd_vma
) -1
3162 || htab
->elf
.splt
== NULL
)
3164 /* We didn't make a PLT entry for this symbol. This
3165 happens when statically linking PIC code, or when
3166 using -Bsymbolic. */
3170 relocation
= (htab
->elf
.splt
->output_section
->vma
3171 + htab
->elf
.splt
->output_offset
3173 unresolved_reloc
= FALSE
;
3180 && ABI_64_P (output_bfd
)
3181 && (input_section
->flags
& SEC_ALLOC
) != 0
3182 && (input_section
->flags
& SEC_READONLY
) != 0
3185 bfd_boolean fail
= FALSE
;
3187 = (r_type
== R_X86_64_PC32
3188 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3190 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3192 /* Symbol is referenced locally. Make sure it is
3193 defined locally or for a branch. */
3194 fail
= !h
->def_regular
&& !branch
;
3198 /* Symbol isn't referenced locally. We only allow
3199 branch to symbol with non-default visibility. */
3201 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3208 const char *pic
= "";
3210 switch (ELF_ST_VISIBILITY (h
->other
))
3213 v
= _("hidden symbol");
3216 v
= _("internal symbol");
3219 v
= _("protected symbol");
3223 pic
= _("; recompile with -fPIC");
3228 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3230 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3232 (*_bfd_error_handler
) (fmt
, input_bfd
,
3233 x86_64_elf_howto_table
[r_type
].name
,
3234 v
, h
->root
.root
.string
, pic
);
3235 bfd_set_error (bfd_error_bad_value
);
3246 /* FIXME: The ABI says the linker should make sure the value is
3247 the same when it's zeroextended to 64 bit. */
3249 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3254 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3255 || h
->root
.type
!= bfd_link_hash_undefweak
)
3256 && (! IS_X86_64_PCREL_TYPE (r_type
)
3257 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3258 || (ELIMINATE_COPY_RELOCS
3265 || h
->root
.type
== bfd_link_hash_undefweak
3266 || h
->root
.type
== bfd_link_hash_undefined
)))
3268 Elf_Internal_Rela outrel
;
3269 bfd_boolean skip
, relocate
;
3272 /* When generating a shared object, these relocations
3273 are copied into the output file to be resolved at run
3279 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3281 if (outrel
.r_offset
== (bfd_vma
) -1)
3283 else if (outrel
.r_offset
== (bfd_vma
) -2)
3284 skip
= TRUE
, relocate
= TRUE
;
3286 outrel
.r_offset
+= (input_section
->output_section
->vma
3287 + input_section
->output_offset
);
3290 memset (&outrel
, 0, sizeof outrel
);
3292 /* h->dynindx may be -1 if this symbol was marked to
3296 && (IS_X86_64_PCREL_TYPE (r_type
)
3298 || ! SYMBOLIC_BIND (info
, h
)
3299 || ! h
->def_regular
))
3301 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3302 outrel
.r_addend
= rel
->r_addend
;
3306 /* This symbol is local, or marked to become local. */
3307 if (r_type
== R_X86_64_64
)
3310 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3311 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3317 if (bfd_is_abs_section (sec
))
3319 else if (sec
== NULL
|| sec
->owner
== NULL
)
3321 bfd_set_error (bfd_error_bad_value
);
3328 /* We are turning this relocation into one
3329 against a section symbol. It would be
3330 proper to subtract the symbol's value,
3331 osec->vma, from the emitted reloc addend,
3332 but ld.so expects buggy relocs. */
3333 osec
= sec
->output_section
;
3334 sindx
= elf_section_data (osec
)->dynindx
;
3337 asection
*oi
= htab
->elf
.text_index_section
;
3338 sindx
= elf_section_data (oi
)->dynindx
;
3340 BFD_ASSERT (sindx
!= 0);
3343 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3344 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3348 sreloc
= elf_section_data (input_section
)->sreloc
;
3350 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
3352 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3354 /* If this reloc is against an external symbol, we do
3355 not want to fiddle with the addend. Otherwise, we
3356 need to include the symbol value so that it becomes
3357 an addend for the dynamic reloc. */
3364 case R_X86_64_TLSGD
:
3365 case R_X86_64_GOTPC32_TLSDESC
:
3366 case R_X86_64_TLSDESC_CALL
:
3367 case R_X86_64_GOTTPOFF
:
3368 tls_type
= GOT_UNKNOWN
;
3369 if (h
== NULL
&& local_got_offsets
)
3370 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3372 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3374 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3375 input_section
, contents
,
3376 symtab_hdr
, sym_hashes
,
3377 &r_type
, tls_type
, rel
,
3378 relend
, h
, r_symndx
))
3381 if (r_type
== R_X86_64_TPOFF32
)
3383 bfd_vma roff
= rel
->r_offset
;
3385 BFD_ASSERT (! unresolved_reloc
);
3387 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3389 /* GD->LE transition.
3390 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3391 .word 0x6666; rex64; call __tls_get_addr
3394 leaq foo@tpoff(%rax), %rax */
3395 memcpy (contents
+ roff
- 4,
3396 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3398 bfd_put_32 (output_bfd
,
3399 elf_x86_64_tpoff (info
, relocation
),
3400 contents
+ roff
+ 8);
3401 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3405 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3407 /* GDesc -> LE transition.
3408 It's originally something like:
3409 leaq x@tlsdesc(%rip), %rax
3412 movl $x@tpoff, %rax. */
3414 unsigned int val
, type
;
3416 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3417 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3418 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3419 contents
+ roff
- 3);
3420 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3421 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3422 contents
+ roff
- 1);
3423 bfd_put_32 (output_bfd
,
3424 elf_x86_64_tpoff (info
, relocation
),
3428 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3430 /* GDesc -> LE transition.
3435 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3436 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3439 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3441 /* IE->LE transition:
3442 Originally it can be one of:
3443 movq foo@gottpoff(%rip), %reg
3444 addq foo@gottpoff(%rip), %reg
3447 leaq foo(%reg), %reg
3450 unsigned int val
, type
, reg
;
3452 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3453 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3454 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3460 bfd_put_8 (output_bfd
, 0x49,
3461 contents
+ roff
- 3);
3462 bfd_put_8 (output_bfd
, 0xc7,
3463 contents
+ roff
- 2);
3464 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3465 contents
+ roff
- 1);
3469 /* addq -> addq - addressing with %rsp/%r12 is
3472 bfd_put_8 (output_bfd
, 0x49,
3473 contents
+ roff
- 3);
3474 bfd_put_8 (output_bfd
, 0x81,
3475 contents
+ roff
- 2);
3476 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3477 contents
+ roff
- 1);
3483 bfd_put_8 (output_bfd
, 0x4d,
3484 contents
+ roff
- 3);
3485 bfd_put_8 (output_bfd
, 0x8d,
3486 contents
+ roff
- 2);
3487 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3488 contents
+ roff
- 1);
3490 bfd_put_32 (output_bfd
,
3491 elf_x86_64_tpoff (info
, relocation
),
3499 if (htab
->elf
.sgot
== NULL
)
3504 off
= h
->got
.offset
;
3505 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
3509 if (local_got_offsets
== NULL
)
3512 off
= local_got_offsets
[r_symndx
];
3513 offplt
= local_tlsdesc_gotents
[r_symndx
];
3520 Elf_Internal_Rela outrel
;
3524 if (htab
->elf
.srelgot
== NULL
)
3527 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3529 if (GOT_TLS_GDESC_P (tls_type
))
3531 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3532 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3533 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3534 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3535 + htab
->elf
.sgotplt
->output_offset
3537 + htab
->sgotplt_jump_table_size
);
3538 sreloc
= htab
->elf
.srelplt
;
3540 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3542 outrel
.r_addend
= 0;
3543 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3546 sreloc
= htab
->elf
.srelgot
;
3548 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3549 + htab
->elf
.sgot
->output_offset
+ off
);
3551 if (GOT_TLS_GD_P (tls_type
))
3552 dr_type
= R_X86_64_DTPMOD64
;
3553 else if (GOT_TLS_GDESC_P (tls_type
))
3556 dr_type
= R_X86_64_TPOFF64
;
3558 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3559 outrel
.r_addend
= 0;
3560 if ((dr_type
== R_X86_64_TPOFF64
3561 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3562 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3563 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
3565 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3567 if (GOT_TLS_GD_P (tls_type
))
3571 BFD_ASSERT (! unresolved_reloc
);
3572 bfd_put_64 (output_bfd
,
3573 relocation
- elf_x86_64_dtpoff_base (info
),
3574 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3578 bfd_put_64 (output_bfd
, 0,
3579 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3580 outrel
.r_info
= htab
->r_info (indx
,
3582 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3583 elf_append_rela (output_bfd
, sreloc
,
3592 local_got_offsets
[r_symndx
] |= 1;
3595 if (off
>= (bfd_vma
) -2
3596 && ! GOT_TLS_GDESC_P (tls_type
))
3598 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
3600 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3601 || r_type
== R_X86_64_TLSDESC_CALL
)
3602 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3603 + htab
->elf
.sgotplt
->output_offset
3604 + offplt
+ htab
->sgotplt_jump_table_size
;
3606 relocation
= htab
->elf
.sgot
->output_section
->vma
3607 + htab
->elf
.sgot
->output_offset
+ off
;
3608 unresolved_reloc
= FALSE
;
3612 bfd_vma roff
= rel
->r_offset
;
3614 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3616 /* GD->IE transition.
3617 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3618 .word 0x6666; rex64; call __tls_get_addr@plt
3621 addq foo@gottpoff(%rip), %rax */
3622 memcpy (contents
+ roff
- 4,
3623 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3626 relocation
= (htab
->elf
.sgot
->output_section
->vma
3627 + htab
->elf
.sgot
->output_offset
+ off
3629 - input_section
->output_section
->vma
3630 - input_section
->output_offset
3632 bfd_put_32 (output_bfd
, relocation
,
3633 contents
+ roff
+ 8);
3634 /* Skip R_X86_64_PLT32. */
3638 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3640 /* GDesc -> IE transition.
3641 It's originally something like:
3642 leaq x@tlsdesc(%rip), %rax
3645 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3647 /* Now modify the instruction as appropriate. To
3648 turn a leaq into a movq in the form we use it, it
3649 suffices to change the second byte from 0x8d to
3651 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3653 bfd_put_32 (output_bfd
,
3654 htab
->elf
.sgot
->output_section
->vma
3655 + htab
->elf
.sgot
->output_offset
+ off
3657 - input_section
->output_section
->vma
3658 - input_section
->output_offset
3663 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3665 /* GDesc -> IE transition.
3672 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3673 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3681 case R_X86_64_TLSLD
:
3682 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3683 input_section
, contents
,
3684 symtab_hdr
, sym_hashes
,
3685 &r_type
, GOT_UNKNOWN
,
3686 rel
, relend
, h
, r_symndx
))
3689 if (r_type
!= R_X86_64_TLSLD
)
3691 /* LD->LE transition:
3692 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3694 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3696 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3697 memcpy (contents
+ rel
->r_offset
- 3,
3698 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3699 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3704 if (htab
->elf
.sgot
== NULL
)
3707 off
= htab
->tls_ld_got
.offset
;
3712 Elf_Internal_Rela outrel
;
3714 if (htab
->elf
.srelgot
== NULL
)
3717 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3718 + htab
->elf
.sgot
->output_offset
+ off
);
3720 bfd_put_64 (output_bfd
, 0,
3721 htab
->elf
.sgot
->contents
+ off
);
3722 bfd_put_64 (output_bfd
, 0,
3723 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3724 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
3725 outrel
.r_addend
= 0;
3726 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
3728 htab
->tls_ld_got
.offset
|= 1;
3730 relocation
= htab
->elf
.sgot
->output_section
->vma
3731 + htab
->elf
.sgot
->output_offset
+ off
;
3732 unresolved_reloc
= FALSE
;
3735 case R_X86_64_DTPOFF32
:
3736 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
3737 relocation
-= elf_x86_64_dtpoff_base (info
);
3739 relocation
= elf_x86_64_tpoff (info
, relocation
);
3742 case R_X86_64_TPOFF32
:
3743 BFD_ASSERT (info
->executable
);
3744 relocation
= elf_x86_64_tpoff (info
, relocation
);
3751 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3752 because such sections are not SEC_ALLOC and thus ld.so will
3753 not process them. */
3754 if (unresolved_reloc
3755 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3757 (*_bfd_error_handler
)
3758 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3761 (long) rel
->r_offset
,
3763 h
->root
.root
.string
);
3766 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3767 contents
, rel
->r_offset
,
3768 relocation
, rel
->r_addend
);
3770 if (r
!= bfd_reloc_ok
)
3775 name
= h
->root
.root
.string
;
3778 name
= bfd_elf_string_from_elf_section (input_bfd
,
3779 symtab_hdr
->sh_link
,
3784 name
= bfd_section_name (input_bfd
, sec
);
3787 if (r
== bfd_reloc_overflow
)
3789 if (! ((*info
->callbacks
->reloc_overflow
)
3790 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3791 (bfd_vma
) 0, input_bfd
, input_section
,
3797 (*_bfd_error_handler
)
3798 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3799 input_bfd
, input_section
,
3800 (long) rel
->r_offset
, name
, (int) r
);
3809 /* Finish up dynamic symbol handling. We set the contents of various
3810 dynamic sections here. */
3813 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3814 struct bfd_link_info
*info
,
3815 struct elf_link_hash_entry
*h
,
3816 Elf_Internal_Sym
*sym
)
3818 struct elf_x86_64_link_hash_table
*htab
;
3820 htab
= elf_x86_64_hash_table (info
);
3824 if (h
->plt
.offset
!= (bfd_vma
) -1)
3828 Elf_Internal_Rela rela
;
3830 asection
*plt
, *gotplt
, *relplt
;
3831 const struct elf_backend_data
*bed
;
3833 /* When building a static executable, use .iplt, .igot.plt and
3834 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3835 if (htab
->elf
.splt
!= NULL
)
3837 plt
= htab
->elf
.splt
;
3838 gotplt
= htab
->elf
.sgotplt
;
3839 relplt
= htab
->elf
.srelplt
;
3843 plt
= htab
->elf
.iplt
;
3844 gotplt
= htab
->elf
.igotplt
;
3845 relplt
= htab
->elf
.irelplt
;
3848 /* This symbol has an entry in the procedure linkage table. Set
3850 if ((h
->dynindx
== -1
3851 && !((h
->forced_local
|| info
->executable
)
3853 && h
->type
== STT_GNU_IFUNC
))
3859 /* Get the index in the procedure linkage table which
3860 corresponds to this symbol. This is the index of this symbol
3861 in all the symbols for which we are making plt entries. The
3862 first entry in the procedure linkage table is reserved.
3864 Get the offset into the .got table of the entry that
3865 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3866 bytes. The first three are reserved for the dynamic linker.
3868 For static executables, we don't reserve anything. */
3870 if (plt
== htab
->elf
.splt
)
3872 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3873 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3877 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3878 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
3881 /* Fill in the entry in the procedure linkage table. */
3882 memcpy (plt
->contents
+ h
->plt
.offset
, elf_x86_64_plt_entry
,
3885 /* Insert the relocation positions of the plt section. The magic
3886 numbers at the end of the statements are the positions of the
3887 relocations in the plt section. */
3888 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3889 instruction uses 6 bytes, subtract this value. */
3890 bfd_put_32 (output_bfd
,
3891 (gotplt
->output_section
->vma
3892 + gotplt
->output_offset
3894 - plt
->output_section
->vma
3895 - plt
->output_offset
3898 plt
->contents
+ h
->plt
.offset
+ 2);
3900 /* Don't fill PLT entry for static executables. */
3901 if (plt
== htab
->elf
.splt
)
3903 /* Put relocation index. */
3904 bfd_put_32 (output_bfd
, plt_index
,
3905 plt
->contents
+ h
->plt
.offset
+ 7);
3906 /* Put offset for jmp .PLT0. */
3907 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3908 plt
->contents
+ h
->plt
.offset
+ 12);
3911 /* Fill in the entry in the global offset table, initially this
3912 points to the pushq instruction in the PLT which is at offset 6. */
3913 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
3914 + plt
->output_offset
3915 + h
->plt
.offset
+ 6),
3916 gotplt
->contents
+ got_offset
);
3918 /* Fill in the entry in the .rela.plt section. */
3919 rela
.r_offset
= (gotplt
->output_section
->vma
3920 + gotplt
->output_offset
3922 if (h
->dynindx
== -1
3923 || ((info
->executable
3924 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
3926 && h
->type
== STT_GNU_IFUNC
))
3928 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3929 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3930 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3931 rela
.r_addend
= (h
->root
.u
.def
.value
3932 + h
->root
.u
.def
.section
->output_section
->vma
3933 + h
->root
.u
.def
.section
->output_offset
);
3937 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
3941 bed
= get_elf_backend_data (output_bfd
);
3942 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
3943 htab
->swap_reloca_out (output_bfd
, &rela
, loc
);
3945 if (!h
->def_regular
)
3947 /* Mark the symbol as undefined, rather than as defined in
3948 the .plt section. Leave the value if there were any
3949 relocations where pointer equality matters (this is a clue
3950 for the dynamic linker, to make function pointer
3951 comparisons work between an application and shared
3952 library), otherwise set it to zero. If a function is only
3953 called from a binary, there is no need to slow down
3954 shared libraries because of that. */
3955 sym
->st_shndx
= SHN_UNDEF
;
3956 if (!h
->pointer_equality_needed
)
3961 if (h
->got
.offset
!= (bfd_vma
) -1
3962 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
3963 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
3965 Elf_Internal_Rela rela
;
3967 /* This symbol has an entry in the global offset table. Set it
3969 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
3972 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3973 + htab
->elf
.sgot
->output_offset
3974 + (h
->got
.offset
&~ (bfd_vma
) 1));
3976 /* If this is a static link, or it is a -Bsymbolic link and the
3977 symbol is defined locally or was forced to be local because
3978 of a version file, we just want to emit a RELATIVE reloc.
3979 The entry in the global offset table will already have been
3980 initialized in the relocate_section function. */
3982 && h
->type
== STT_GNU_IFUNC
)
3986 /* Generate R_X86_64_GLOB_DAT. */
3993 if (!h
->pointer_equality_needed
)
3996 /* For non-shared object, we can't use .got.plt, which
3997 contains the real function addres if we need pointer
3998 equality. We load the GOT entry with the PLT entry. */
3999 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4000 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4001 + plt
->output_offset
4003 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4007 else if (info
->shared
4008 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4010 if (!h
->def_regular
)
4012 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4013 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4014 rela
.r_addend
= (h
->root
.u
.def
.value
4015 + h
->root
.u
.def
.section
->output_section
->vma
4016 + h
->root
.u
.def
.section
->output_offset
);
4020 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4022 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4023 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4024 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4028 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
4033 Elf_Internal_Rela rela
;
4035 /* This symbol needs a copy reloc. Set it up. */
4037 if (h
->dynindx
== -1
4038 || (h
->root
.type
!= bfd_link_hash_defined
4039 && h
->root
.type
!= bfd_link_hash_defweak
)
4040 || htab
->srelbss
== NULL
)
4043 rela
.r_offset
= (h
->root
.u
.def
.value
4044 + h
->root
.u
.def
.section
->output_section
->vma
4045 + h
->root
.u
.def
.section
->output_offset
);
4046 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4048 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
4051 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4052 be NULL for local symbols. */
4054 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4055 || h
== htab
->elf
.hgot
))
4056 sym
->st_shndx
= SHN_ABS
;
4061 /* Finish up local dynamic symbol handling. We set the contents of
4062 various dynamic sections here. */
4065 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4067 struct elf_link_hash_entry
*h
4068 = (struct elf_link_hash_entry
*) *slot
;
4069 struct bfd_link_info
*info
4070 = (struct bfd_link_info
*) inf
;
4072 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4076 /* Used to decide how to sort relocs in an optimal manner for the
4077 dynamic linker, before writing them out. */
4079 static enum elf_reloc_type_class
4080 elf_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4082 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4084 case R_X86_64_RELATIVE
:
4085 return reloc_class_relative
;
4086 case R_X86_64_JUMP_SLOT
:
4087 return reloc_class_plt
;
4089 return reloc_class_copy
;
4091 return reloc_class_normal
;
4095 /* Finish up the dynamic sections. */
4098 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4099 struct bfd_link_info
*info
)
4101 struct elf_x86_64_link_hash_table
*htab
;
4105 htab
= elf_x86_64_hash_table (info
);
4109 dynobj
= htab
->elf
.dynobj
;
4110 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4112 if (htab
->elf
.dynamic_sections_created
)
4114 Elf64_External_Dyn
*dyncon
, *dynconend
;
4116 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4119 dyncon
= (Elf64_External_Dyn
*) sdyn
->contents
;
4120 dynconend
= (Elf64_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
4121 for (; dyncon
< dynconend
; dyncon
++)
4123 Elf_Internal_Dyn dyn
;
4126 bfd_elf64_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4134 s
= htab
->elf
.sgotplt
;
4135 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4139 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4143 s
= htab
->elf
.srelplt
->output_section
;
4144 dyn
.d_un
.d_val
= s
->size
;
4148 /* The procedure linkage table relocs (DT_JMPREL) should
4149 not be included in the overall relocs (DT_RELA).
4150 Therefore, we override the DT_RELASZ entry here to
4151 make it not include the JMPREL relocs. Since the
4152 linker script arranges for .rela.plt to follow all
4153 other relocation sections, we don't have to worry
4154 about changing the DT_RELA entry. */
4155 if (htab
->elf
.srelplt
!= NULL
)
4157 s
= htab
->elf
.srelplt
->output_section
;
4158 dyn
.d_un
.d_val
-= s
->size
;
4162 case DT_TLSDESC_PLT
:
4164 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4165 + htab
->tlsdesc_plt
;
4168 case DT_TLSDESC_GOT
:
4170 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4171 + htab
->tlsdesc_got
;
4175 bfd_elf64_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4178 /* Fill in the special first entry in the procedure linkage table. */
4179 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4181 /* Fill in the first entry in the procedure linkage table. */
4182 memcpy (htab
->elf
.splt
->contents
, elf_x86_64_plt0_entry
,
4184 /* Add offset for pushq GOT+8(%rip), since the instruction
4185 uses 6 bytes subtract this value. */
4186 bfd_put_32 (output_bfd
,
4187 (htab
->elf
.sgotplt
->output_section
->vma
4188 + htab
->elf
.sgotplt
->output_offset
4190 - htab
->elf
.splt
->output_section
->vma
4191 - htab
->elf
.splt
->output_offset
4193 htab
->elf
.splt
->contents
+ 2);
4194 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4195 the end of the instruction. */
4196 bfd_put_32 (output_bfd
,
4197 (htab
->elf
.sgotplt
->output_section
->vma
4198 + htab
->elf
.sgotplt
->output_offset
4200 - htab
->elf
.splt
->output_section
->vma
4201 - htab
->elf
.splt
->output_offset
4203 htab
->elf
.splt
->contents
+ 8);
4205 elf_section_data (htab
->elf
.splt
->output_section
)->this_hdr
.sh_entsize
=
4208 if (htab
->tlsdesc_plt
)
4210 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4211 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4213 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4214 elf_x86_64_plt0_entry
,
4217 /* Add offset for pushq GOT+8(%rip), since the
4218 instruction uses 6 bytes subtract this value. */
4219 bfd_put_32 (output_bfd
,
4220 (htab
->elf
.sgotplt
->output_section
->vma
4221 + htab
->elf
.sgotplt
->output_offset
4223 - htab
->elf
.splt
->output_section
->vma
4224 - htab
->elf
.splt
->output_offset
4227 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4228 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4229 htab->tlsdesc_got. The 12 is the offset to the end of
4231 bfd_put_32 (output_bfd
,
4232 (htab
->elf
.sgot
->output_section
->vma
4233 + htab
->elf
.sgot
->output_offset
4235 - htab
->elf
.splt
->output_section
->vma
4236 - htab
->elf
.splt
->output_offset
4239 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4244 if (htab
->elf
.sgotplt
)
4246 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4248 (*_bfd_error_handler
)
4249 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4253 /* Fill in the first three entries in the global offset table. */
4254 if (htab
->elf
.sgotplt
->size
> 0)
4256 /* Set the first entry in the global offset table to the address of
4257 the dynamic section. */
4259 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4261 bfd_put_64 (output_bfd
,
4262 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4263 htab
->elf
.sgotplt
->contents
);
4264 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4265 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4266 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4269 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4273 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4274 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4277 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4278 htab_traverse (htab
->loc_hash_table
,
4279 elf_x86_64_finish_local_dynamic_symbol
,
4285 /* Return address for Ith PLT stub in section PLT, for relocation REL
4286 or (bfd_vma) -1 if it should not be included. */
4289 elf_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4290 const arelent
*rel ATTRIBUTE_UNUSED
)
4292 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4295 /* Handle an x86-64 specific section when reading an object file. This
4296 is called when elfcode.h finds a section with an unknown type. */
4299 elf_x86_64_section_from_shdr (bfd
*abfd
,
4300 Elf_Internal_Shdr
*hdr
,
4304 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4307 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4313 /* Hook called by the linker routine which adds symbols from an object
4314 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4318 elf_x86_64_add_symbol_hook (bfd
*abfd
,
4319 struct bfd_link_info
*info
,
4320 Elf_Internal_Sym
*sym
,
4321 const char **namep ATTRIBUTE_UNUSED
,
4322 flagword
*flagsp ATTRIBUTE_UNUSED
,
4328 switch (sym
->st_shndx
)
4330 case SHN_X86_64_LCOMMON
:
4331 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4334 lcomm
= bfd_make_section_with_flags (abfd
,
4338 | SEC_LINKER_CREATED
));
4341 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4344 *valp
= sym
->st_size
;
4348 if ((abfd
->flags
& DYNAMIC
) == 0
4349 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4350 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4356 /* Given a BFD section, try to locate the corresponding ELF section
4360 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4361 asection
*sec
, int *index_return
)
4363 if (sec
== &_bfd_elf_large_com_section
)
4365 *index_return
= SHN_X86_64_LCOMMON
;
4371 /* Process a symbol. */
4374 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4377 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4379 switch (elfsym
->internal_elf_sym
.st_shndx
)
4381 case SHN_X86_64_LCOMMON
:
4382 asym
->section
= &_bfd_elf_large_com_section
;
4383 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4384 /* Common symbol doesn't set BSF_GLOBAL. */
4385 asym
->flags
&= ~BSF_GLOBAL
;
4391 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4393 return (sym
->st_shndx
== SHN_COMMON
4394 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4398 elf_x86_64_common_section_index (asection
*sec
)
4400 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4403 return SHN_X86_64_LCOMMON
;
4407 elf_x86_64_common_section (asection
*sec
)
4409 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4410 return bfd_com_section_ptr
;
4412 return &_bfd_elf_large_com_section
;
4416 elf_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4417 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4418 struct elf_link_hash_entry
*h
,
4419 Elf_Internal_Sym
*sym
,
4421 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4422 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4423 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4424 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4425 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4426 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4427 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4428 bfd_boolean
*newdyn
,
4429 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4430 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4431 bfd
*abfd ATTRIBUTE_UNUSED
,
4433 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4434 bfd_boolean
*olddyn
,
4435 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4436 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4440 /* A normal common symbol and a large common symbol result in a
4441 normal common symbol. We turn the large common symbol into a
4444 && h
->root
.type
== bfd_link_hash_common
4446 && bfd_is_com_section (*sec
)
4449 if (sym
->st_shndx
== SHN_COMMON
4450 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4452 h
->root
.u
.c
.p
->section
4453 = bfd_make_section_old_way (oldbfd
, "COMMON");
4454 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4456 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4457 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4458 *psec
= *sec
= bfd_com_section_ptr
;
4465 elf_x86_64_additional_program_headers (bfd
*abfd
,
4466 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4471 /* Check to see if we need a large readonly segment. */
4472 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4473 if (s
&& (s
->flags
& SEC_LOAD
))
4476 /* Check to see if we need a large data segment. Since .lbss sections
4477 is placed right after the .bss section, there should be no need for
4478 a large data segment just because of .lbss. */
4479 s
= bfd_get_section_by_name (abfd
, ".ldata");
4480 if (s
&& (s
->flags
& SEC_LOAD
))
4486 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4489 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4491 if (h
->plt
.offset
!= (bfd_vma
) -1
4493 && !h
->pointer_equality_needed
)
4496 return _bfd_elf_hash_symbol (h
);
4499 static const struct bfd_elf_special_section
4500 elf_x86_64_special_sections
[]=
4502 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4503 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4504 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4505 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4506 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4507 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4508 { NULL
, 0, 0, 0, 0 }
4511 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4512 #define TARGET_LITTLE_NAME "elf64-x86-64"
4513 #define ELF_ARCH bfd_arch_i386
4514 #define ELF_TARGET_ID X86_64_ELF_DATA
4515 #define ELF_MACHINE_CODE EM_X86_64
4516 #define ELF_MAXPAGESIZE 0x200000
4517 #define ELF_MINPAGESIZE 0x1000
4518 #define ELF_COMMONPAGESIZE 0x1000
4520 #define elf_backend_can_gc_sections 1
4521 #define elf_backend_can_refcount 1
4522 #define elf_backend_want_got_plt 1
4523 #define elf_backend_plt_readonly 1
4524 #define elf_backend_want_plt_sym 0
4525 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4526 #define elf_backend_rela_normal 1
4528 #define elf_info_to_howto elf_x86_64_info_to_howto
4530 #define bfd_elf64_bfd_link_hash_table_create \
4531 elf_x86_64_link_hash_table_create
4532 #define bfd_elf64_bfd_link_hash_table_free \
4533 elf_x86_64_link_hash_table_free
4534 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
4535 #define bfd_elf64_bfd_reloc_name_lookup \
4536 elf_x86_64_reloc_name_lookup
4538 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
4539 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4540 #define elf_backend_check_relocs elf_x86_64_check_relocs
4541 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
4542 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
4543 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
4544 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
4545 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
4546 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
4547 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
4548 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
4549 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
4550 #define elf_backend_relocate_section elf_x86_64_relocate_section
4551 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
4552 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
4553 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4554 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
4555 #define elf_backend_object_p elf64_x86_64_elf_object_p
4556 #define bfd_elf64_mkobject elf_x86_64_mkobject
4558 #define elf_backend_section_from_shdr \
4559 elf_x86_64_section_from_shdr
4561 #define elf_backend_section_from_bfd_section \
4562 elf_x86_64_elf_section_from_bfd_section
4563 #define elf_backend_add_symbol_hook \
4564 elf_x86_64_add_symbol_hook
4565 #define elf_backend_symbol_processing \
4566 elf_x86_64_symbol_processing
4567 #define elf_backend_common_section_index \
4568 elf_x86_64_common_section_index
4569 #define elf_backend_common_section \
4570 elf_x86_64_common_section
4571 #define elf_backend_common_definition \
4572 elf_x86_64_common_definition
4573 #define elf_backend_merge_symbol \
4574 elf_x86_64_merge_symbol
4575 #define elf_backend_special_sections \
4576 elf_x86_64_special_sections
4577 #define elf_backend_additional_program_headers \
4578 elf_x86_64_additional_program_headers
4579 #define elf_backend_hash_symbol \
4580 elf_x86_64_hash_symbol
4582 #undef elf_backend_post_process_headers
4583 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4585 #include "elf64-target.h"
4587 /* FreeBSD support. */
4589 #undef TARGET_LITTLE_SYM
4590 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4591 #undef TARGET_LITTLE_NAME
4592 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4595 #define ELF_OSABI ELFOSABI_FREEBSD
4598 #define elf64_bed elf64_x86_64_fbsd_bed
4600 #include "elf64-target.h"
4602 /* Solaris 2 support. */
4604 #undef TARGET_LITTLE_SYM
4605 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4606 #undef TARGET_LITTLE_NAME
4607 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4609 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4610 objects won't be recognized. */
4614 #define elf64_bed elf64_x86_64_sol2_bed
4616 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
4618 #undef elf_backend_static_tls_alignment
4619 #define elf_backend_static_tls_alignment 16
4621 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4623 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4625 #undef elf_backend_want_plt_sym
4626 #define elf_backend_want_plt_sym 1
4628 #include "elf64-target.h"
4630 /* Intel L1OM support. */
4633 elf64_l1om_elf_object_p (bfd
*abfd
)
4635 /* Set the right machine number for an L1OM elf64 file. */
4636 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
4640 #undef TARGET_LITTLE_SYM
4641 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4642 #undef TARGET_LITTLE_NAME
4643 #define TARGET_LITTLE_NAME "elf64-l1om"
4645 #define ELF_ARCH bfd_arch_l1om
4647 #undef ELF_MACHINE_CODE
4648 #define ELF_MACHINE_CODE EM_L1OM
4653 #define elf64_bed elf64_l1om_bed
4655 #undef elf_backend_object_p
4656 #define elf_backend_object_p elf64_l1om_elf_object_p
4658 #undef elf_backend_post_process_headers
4659 #undef elf_backend_static_tls_alignment
4661 #include "elf64-target.h"
4663 /* FreeBSD L1OM support. */
4665 #undef TARGET_LITTLE_SYM
4666 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4667 #undef TARGET_LITTLE_NAME
4668 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4671 #define ELF_OSABI ELFOSABI_FREEBSD
4674 #define elf64_bed elf64_l1om_fbsd_bed
4676 #undef elf_backend_post_process_headers
4677 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4679 #include "elf64-target.h"
4681 /* 32bit x86-64 support. */
4684 elf32_x86_64_elf_object_p (bfd
*abfd
)
4686 /* Set the right machine number for an x86-64 elf32 file. */
4687 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
4691 #undef TARGET_LITTLE_SYM
4692 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
4693 #undef TARGET_LITTLE_NAME
4694 #define TARGET_LITTLE_NAME "elf32-x86-64"
4697 #define ELF_ARCH bfd_arch_i386
4699 #undef ELF_MACHINE_CODE
4700 #define ELF_MACHINE_CODE EM_X86_64
4702 #define bfd_elf32_bfd_link_hash_table_create \
4703 elf_x86_64_link_hash_table_create
4704 #define bfd_elf32_bfd_link_hash_table_free \
4705 elf_x86_64_link_hash_table_free
4706 #define bfd_elf32_bfd_reloc_type_lookup \
4707 elf_x86_64_reloc_type_lookup
4708 #define bfd_elf32_bfd_reloc_name_lookup \
4709 elf_x86_64_reloc_name_lookup
4710 #define bfd_elf32_mkobject \
4715 #undef elf_backend_post_process_headers
4717 #undef elf_backend_object_p
4718 #define elf_backend_object_p \
4719 elf32_x86_64_elf_object_p
4721 #undef elf_backend_bfd_from_remote_memory
4722 #define elf_backend_bfd_from_remote_memory \
4723 _bfd_elf32_bfd_from_remote_memory
4725 #undef elf_backend_size_info
4726 #define elf_backend_size_info \
4727 _bfd_elf32_size_info
4729 #include "elf32-target.h"