1 /* X86-64 specific support for 64-bit 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 /* The relocation "howto" table. Order of fields:
38 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
39 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
40 static reloc_howto_type x86_64_elf_howto_table
[] =
42 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
43 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
45 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
46 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
48 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
49 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
51 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
52 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
54 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
55 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
57 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
58 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
60 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
61 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
63 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
64 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
66 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
67 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
69 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
70 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
72 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
73 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
76 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
78 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
79 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
80 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
81 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
82 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
84 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
85 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
86 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
87 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
89 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
90 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
92 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
93 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
95 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
96 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
98 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
99 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
101 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
102 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
104 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
105 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
107 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
108 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
110 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
111 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
113 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
114 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
115 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
116 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
117 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
118 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
119 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
120 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
122 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
123 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
125 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
126 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
127 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
128 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
129 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
131 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
132 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
136 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
137 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
138 "R_X86_64_GOTPC32_TLSDESC",
139 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
140 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
141 complain_overflow_dont
, bfd_elf_generic_reloc
,
142 "R_X86_64_TLSDESC_CALL",
144 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
145 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
147 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
148 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
149 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
152 /* We have a gap in the reloc numbers here.
153 R_X86_64_standard counts the number up to this point, and
154 R_X86_64_vt_offset is the value to subtract from a reloc type of
155 R_X86_64_GNU_VT* to form an index into this table. */
156 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
157 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
159 /* GNU extension to record C++ vtable hierarchy. */
160 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
161 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
163 /* GNU extension to record C++ vtable member usage. */
164 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
165 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
169 #define IS_X86_64_PCREL_TYPE(TYPE) \
170 ( ((TYPE) == R_X86_64_PC8) \
171 || ((TYPE) == R_X86_64_PC16) \
172 || ((TYPE) == R_X86_64_PC32) \
173 || ((TYPE) == R_X86_64_PC64))
175 /* Map BFD relocs to the x86_64 elf relocs. */
178 bfd_reloc_code_real_type bfd_reloc_val
;
179 unsigned char elf_reloc_val
;
182 static const struct elf_reloc_map x86_64_reloc_map
[] =
184 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
185 { BFD_RELOC_64
, R_X86_64_64
, },
186 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
187 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
188 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
189 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
190 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
191 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
192 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
193 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
194 { BFD_RELOC_32
, R_X86_64_32
, },
195 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
196 { BFD_RELOC_16
, R_X86_64_16
, },
197 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
198 { BFD_RELOC_8
, R_X86_64_8
, },
199 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
200 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
201 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
202 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
203 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
204 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
205 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
206 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
207 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
208 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
209 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
210 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
211 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
212 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
213 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
214 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
215 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
216 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
217 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
218 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
219 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
220 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
221 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
224 static reloc_howto_type
*
225 elf64_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
229 if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
230 || r_type
>= (unsigned int) R_X86_64_max
)
232 if (r_type
>= (unsigned int) R_X86_64_standard
)
234 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
236 r_type
= R_X86_64_NONE
;
241 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
242 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
243 return &x86_64_elf_howto_table
[i
];
246 /* Given a BFD reloc type, return a HOWTO structure. */
247 static reloc_howto_type
*
248 elf64_x86_64_reloc_type_lookup (bfd
*abfd
,
249 bfd_reloc_code_real_type code
)
253 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
256 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
257 return elf64_x86_64_rtype_to_howto (abfd
,
258 x86_64_reloc_map
[i
].elf_reloc_val
);
263 static reloc_howto_type
*
264 elf64_x86_64_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
270 i
< (sizeof (x86_64_elf_howto_table
)
271 / sizeof (x86_64_elf_howto_table
[0]));
273 if (x86_64_elf_howto_table
[i
].name
!= NULL
274 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
275 return &x86_64_elf_howto_table
[i
];
280 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
283 elf64_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
284 Elf_Internal_Rela
*dst
)
288 r_type
= ELF64_R_TYPE (dst
->r_info
);
289 cache_ptr
->howto
= elf64_x86_64_rtype_to_howto (abfd
, r_type
);
290 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
293 /* Support for core dump NOTE sections. */
295 elf64_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
300 switch (note
->descsz
)
305 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
307 elf_tdata (abfd
)->core_signal
308 = bfd_get_16 (abfd
, note
->descdata
+ 12);
311 elf_tdata (abfd
)->core_lwpid
312 = bfd_get_32 (abfd
, note
->descdata
+ 32);
321 /* Make a ".reg/999" section. */
322 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
323 size
, note
->descpos
+ offset
);
327 elf64_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
329 switch (note
->descsz
)
334 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
335 elf_tdata (abfd
)->core_pid
336 = bfd_get_32 (abfd
, note
->descdata
+ 24);
337 elf_tdata (abfd
)->core_program
338 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
339 elf_tdata (abfd
)->core_command
340 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
343 /* Note that for some reason, a spurious space is tacked
344 onto the end of the args in some (at least one anyway)
345 implementations, so strip it off if it exists. */
348 char *command
= elf_tdata (abfd
)->core_command
;
349 int n
= strlen (command
);
351 if (0 < n
&& command
[n
- 1] == ' ')
352 command
[n
- 1] = '\0';
358 /* Functions for the x86-64 ELF linker. */
360 /* The name of the dynamic interpreter. This is put in the .interp
363 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
365 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
366 copying dynamic variables from a shared lib into an app's dynbss
367 section, and instead use a dynamic relocation to point into the
369 #define ELIMINATE_COPY_RELOCS 1
371 /* The size in bytes of an entry in the global offset table. */
373 #define GOT_ENTRY_SIZE 8
375 /* The size in bytes of an entry in the procedure linkage table. */
377 #define PLT_ENTRY_SIZE 16
379 /* The first entry in a procedure linkage table looks like this. See the
380 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
382 static const bfd_byte elf64_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
384 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
385 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
386 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
389 /* Subsequent entries in a procedure linkage table look like this. */
391 static const bfd_byte elf64_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
393 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
394 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
395 0x68, /* pushq immediate */
396 0, 0, 0, 0, /* replaced with index into relocation table. */
397 0xe9, /* jmp relative */
398 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
401 /* x86-64 ELF linker hash entry. */
403 struct elf64_x86_64_link_hash_entry
405 struct elf_link_hash_entry elf
;
407 /* Track dynamic relocs copied for this symbol. */
408 struct elf_dyn_relocs
*dyn_relocs
;
410 #define GOT_UNKNOWN 0
414 #define GOT_TLS_GDESC 4
415 #define GOT_TLS_GD_BOTH_P(type) \
416 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
417 #define GOT_TLS_GD_P(type) \
418 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
419 #define GOT_TLS_GDESC_P(type) \
420 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
421 #define GOT_TLS_GD_ANY_P(type) \
422 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
423 unsigned char tls_type
;
425 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
426 starting at the end of the jump table. */
430 #define elf64_x86_64_hash_entry(ent) \
431 ((struct elf64_x86_64_link_hash_entry *)(ent))
433 struct elf64_x86_64_obj_tdata
435 struct elf_obj_tdata root
;
437 /* tls_type for each local got entry. */
438 char *local_got_tls_type
;
440 /* GOTPLT entries for TLS descriptors. */
441 bfd_vma
*local_tlsdesc_gotent
;
444 #define elf64_x86_64_tdata(abfd) \
445 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
447 #define elf64_x86_64_local_got_tls_type(abfd) \
448 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
450 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
451 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
453 #define is_x86_64_elf(bfd) \
454 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
455 && elf_tdata (bfd) != NULL \
456 && elf_object_id (bfd) == X86_64_ELF_DATA)
459 elf64_x86_64_mkobject (bfd
*abfd
)
461 return bfd_elf_allocate_object (abfd
, sizeof (struct elf64_x86_64_obj_tdata
),
465 /* x86-64 ELF linker hash table. */
467 struct elf64_x86_64_link_hash_table
469 struct elf_link_hash_table elf
;
471 /* Short-cuts to get to dynamic linker sections. */
477 bfd_signed_vma refcount
;
481 /* The amount of space used by the jump slots in the GOT. */
482 bfd_vma sgotplt_jump_table_size
;
484 /* Small local sym cache. */
485 struct sym_cache sym_cache
;
487 /* _TLS_MODULE_BASE_ symbol. */
488 struct bfd_link_hash_entry
*tls_module_base
;
490 /* Used by local STT_GNU_IFUNC symbols. */
491 htab_t loc_hash_table
;
492 void * loc_hash_memory
;
494 /* The offset into splt of the PLT entry for the TLS descriptor
495 resolver. Special values are 0, if not necessary (or not found
496 to be necessary yet), and -1 if needed but not determined
499 /* The offset into sgot of the GOT entry used by the PLT entry
504 /* Get the x86-64 ELF linker hash table from a link_info structure. */
506 #define elf64_x86_64_hash_table(p) \
507 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
508 == X86_64_ELF_DATA ? ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) : NULL)
510 #define elf64_x86_64_compute_jump_table_size(htab) \
511 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
513 /* Create an entry in an x86-64 ELF linker hash table. */
515 static struct bfd_hash_entry
*
516 elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
517 struct bfd_hash_table
*table
,
520 /* Allocate the structure if it has not already been allocated by a
524 entry
= (struct bfd_hash_entry
*)
525 bfd_hash_allocate (table
,
526 sizeof (struct elf64_x86_64_link_hash_entry
));
531 /* Call the allocation method of the superclass. */
532 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
535 struct elf64_x86_64_link_hash_entry
*eh
;
537 eh
= (struct elf64_x86_64_link_hash_entry
*) entry
;
538 eh
->dyn_relocs
= NULL
;
539 eh
->tls_type
= GOT_UNKNOWN
;
540 eh
->tlsdesc_got
= (bfd_vma
) -1;
546 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
547 for local symbol so that we can handle local STT_GNU_IFUNC symbols
548 as global symbol. We reuse indx and dynstr_index for local symbol
549 hash since they aren't used by global symbols in this backend. */
552 elf64_x86_64_local_htab_hash (const void *ptr
)
554 struct elf_link_hash_entry
*h
555 = (struct elf_link_hash_entry
*) ptr
;
556 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
559 /* Compare local hash entries. */
562 elf64_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
564 struct elf_link_hash_entry
*h1
565 = (struct elf_link_hash_entry
*) ptr1
;
566 struct elf_link_hash_entry
*h2
567 = (struct elf_link_hash_entry
*) ptr2
;
569 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
572 /* Find and/or create a hash entry for local symbol. */
574 static struct elf_link_hash_entry
*
575 elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table
*htab
,
576 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
579 struct elf64_x86_64_link_hash_entry e
, *ret
;
580 asection
*sec
= abfd
->sections
;
581 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
582 ELF64_R_SYM (rel
->r_info
));
585 e
.elf
.indx
= sec
->id
;
586 e
.elf
.dynstr_index
= ELF64_R_SYM (rel
->r_info
);
587 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
588 create
? INSERT
: NO_INSERT
);
595 ret
= (struct elf64_x86_64_link_hash_entry
*) *slot
;
599 ret
= (struct elf64_x86_64_link_hash_entry
*)
600 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
601 sizeof (struct elf64_x86_64_link_hash_entry
));
604 memset (ret
, 0, sizeof (*ret
));
605 ret
->elf
.indx
= sec
->id
;
606 ret
->elf
.dynstr_index
= ELF64_R_SYM (rel
->r_info
);
607 ret
->elf
.dynindx
= -1;
613 /* Create an X86-64 ELF linker hash table. */
615 static struct bfd_link_hash_table
*
616 elf64_x86_64_link_hash_table_create (bfd
*abfd
)
618 struct elf64_x86_64_link_hash_table
*ret
;
619 bfd_size_type amt
= sizeof (struct elf64_x86_64_link_hash_table
);
621 ret
= (struct elf64_x86_64_link_hash_table
*) bfd_malloc (amt
);
625 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
626 elf64_x86_64_link_hash_newfunc
,
627 sizeof (struct elf64_x86_64_link_hash_entry
),
636 ret
->sym_cache
.abfd
= NULL
;
637 ret
->tlsdesc_plt
= 0;
638 ret
->tlsdesc_got
= 0;
639 ret
->tls_ld_got
.refcount
= 0;
640 ret
->sgotplt_jump_table_size
= 0;
641 ret
->tls_module_base
= NULL
;
643 ret
->loc_hash_table
= htab_try_create (1024,
644 elf64_x86_64_local_htab_hash
,
645 elf64_x86_64_local_htab_eq
,
647 ret
->loc_hash_memory
= objalloc_create ();
648 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
654 return &ret
->elf
.root
;
657 /* Destroy an X86-64 ELF linker hash table. */
660 elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table
*hash
)
662 struct elf64_x86_64_link_hash_table
*htab
663 = (struct elf64_x86_64_link_hash_table
*) hash
;
665 if (htab
->loc_hash_table
)
666 htab_delete (htab
->loc_hash_table
);
667 if (htab
->loc_hash_memory
)
668 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
669 _bfd_generic_link_hash_table_free (hash
);
672 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
673 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
677 elf64_x86_64_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
679 struct elf64_x86_64_link_hash_table
*htab
;
681 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
684 htab
= elf64_x86_64_hash_table (info
);
688 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
690 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
693 || (!info
->shared
&& !htab
->srelbss
))
699 /* Copy the extra info we tack onto an elf_link_hash_entry. */
702 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
703 struct elf_link_hash_entry
*dir
,
704 struct elf_link_hash_entry
*ind
)
706 struct elf64_x86_64_link_hash_entry
*edir
, *eind
;
708 edir
= (struct elf64_x86_64_link_hash_entry
*) dir
;
709 eind
= (struct elf64_x86_64_link_hash_entry
*) ind
;
711 if (eind
->dyn_relocs
!= NULL
)
713 if (edir
->dyn_relocs
!= NULL
)
715 struct elf_dyn_relocs
**pp
;
716 struct elf_dyn_relocs
*p
;
718 /* Add reloc counts against the indirect sym to the direct sym
719 list. Merge any entries against the same section. */
720 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
722 struct elf_dyn_relocs
*q
;
724 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
725 if (q
->sec
== p
->sec
)
727 q
->pc_count
+= p
->pc_count
;
728 q
->count
+= p
->count
;
735 *pp
= edir
->dyn_relocs
;
738 edir
->dyn_relocs
= eind
->dyn_relocs
;
739 eind
->dyn_relocs
= NULL
;
742 if (ind
->root
.type
== bfd_link_hash_indirect
743 && dir
->got
.refcount
<= 0)
745 edir
->tls_type
= eind
->tls_type
;
746 eind
->tls_type
= GOT_UNKNOWN
;
749 if (ELIMINATE_COPY_RELOCS
750 && ind
->root
.type
!= bfd_link_hash_indirect
751 && dir
->dynamic_adjusted
)
753 /* If called to transfer flags for a weakdef during processing
754 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
755 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
756 dir
->ref_dynamic
|= ind
->ref_dynamic
;
757 dir
->ref_regular
|= ind
->ref_regular
;
758 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
759 dir
->needs_plt
|= ind
->needs_plt
;
760 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
763 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
767 elf64_x86_64_elf_object_p (bfd
*abfd
)
769 /* Set the right machine number for an x86-64 elf64 file. */
770 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
788 /* Return TRUE if the TLS access code sequence support transition
792 elf64_x86_64_check_tls_transition (bfd
*abfd
, asection
*sec
,
794 Elf_Internal_Shdr
*symtab_hdr
,
795 struct elf_link_hash_entry
**sym_hashes
,
797 const Elf_Internal_Rela
*rel
,
798 const Elf_Internal_Rela
*relend
)
801 unsigned long r_symndx
;
802 struct elf_link_hash_entry
*h
;
805 /* Get the section contents. */
806 if (contents
== NULL
)
808 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
809 contents
= elf_section_data (sec
)->this_hdr
.contents
;
812 /* FIXME: How to better handle error condition? */
813 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
816 /* Cache the section contents for elf_link_input_bfd. */
817 elf_section_data (sec
)->this_hdr
.contents
= contents
;
821 offset
= rel
->r_offset
;
826 if ((rel
+ 1) >= relend
)
829 if (r_type
== R_X86_64_TLSGD
)
831 /* Check transition from GD access model. Only
832 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
833 .word 0x6666; rex64; call __tls_get_addr
834 can transit to different access model. */
836 static x86_64_opcode32 leaq
= { { 0x66, 0x48, 0x8d, 0x3d } },
837 call
= { { 0x66, 0x66, 0x48, 0xe8 } };
839 || (offset
+ 12) > sec
->size
840 || bfd_get_32 (abfd
, contents
+ offset
- 4) != leaq
.i
841 || bfd_get_32 (abfd
, contents
+ offset
+ 4) != call
.i
)
846 /* Check transition from LD access model. Only
847 leaq foo@tlsld(%rip), %rdi;
849 can transit to different access model. */
851 static x86_64_opcode32 ld
= { { 0x48, 0x8d, 0x3d, 0xe8 } };
854 if (offset
< 3 || (offset
+ 9) > sec
->size
)
857 op
.i
= bfd_get_32 (abfd
, contents
+ offset
- 3);
858 op
.c
[3] = bfd_get_8 (abfd
, contents
+ offset
+ 4);
863 r_symndx
= ELF64_R_SYM (rel
[1].r_info
);
864 if (r_symndx
< symtab_hdr
->sh_info
)
867 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
868 /* Use strncmp to check __tls_get_addr since __tls_get_addr
871 && h
->root
.root
.string
!= NULL
872 && (ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
873 || ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
874 && (strncmp (h
->root
.root
.string
,
875 "__tls_get_addr", 14) == 0));
877 case R_X86_64_GOTTPOFF
:
878 /* Check transition from IE access model:
879 movq foo@gottpoff(%rip), %reg
880 addq foo@gottpoff(%rip), %reg
883 if (offset
< 3 || (offset
+ 4) > sec
->size
)
886 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
887 if (val
!= 0x48 && val
!= 0x4c)
890 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
891 if (val
!= 0x8b && val
!= 0x03)
894 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
895 return (val
& 0xc7) == 5;
897 case R_X86_64_GOTPC32_TLSDESC
:
898 /* Check transition from GDesc access model:
899 leaq x@tlsdesc(%rip), %rax
901 Make sure it's a leaq adding rip to a 32-bit offset
902 into any register, although it's probably almost always
905 if (offset
< 3 || (offset
+ 4) > sec
->size
)
908 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
909 if ((val
& 0xfb) != 0x48)
912 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
915 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
916 return (val
& 0xc7) == 0x05;
918 case R_X86_64_TLSDESC_CALL
:
919 /* Check transition from GDesc access model:
920 call *x@tlsdesc(%rax)
922 if (offset
+ 2 <= sec
->size
)
924 /* Make sure that it's a call *x@tlsdesc(%rax). */
925 static x86_64_opcode16 call
= { { 0xff, 0x10 } };
926 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
936 /* Return TRUE if the TLS access transition is OK or no transition
937 will be performed. Update R_TYPE if there is a transition. */
940 elf64_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
941 asection
*sec
, bfd_byte
*contents
,
942 Elf_Internal_Shdr
*symtab_hdr
,
943 struct elf_link_hash_entry
**sym_hashes
,
944 unsigned int *r_type
, int tls_type
,
945 const Elf_Internal_Rela
*rel
,
946 const Elf_Internal_Rela
*relend
,
947 struct elf_link_hash_entry
*h
,
948 unsigned long r_symndx
)
950 unsigned int from_type
= *r_type
;
951 unsigned int to_type
= from_type
;
952 bfd_boolean check
= TRUE
;
954 /* Skip TLS transition for functions. */
956 && (h
->type
== STT_FUNC
957 || h
->type
== STT_GNU_IFUNC
))
963 case R_X86_64_GOTPC32_TLSDESC
:
964 case R_X86_64_TLSDESC_CALL
:
965 case R_X86_64_GOTTPOFF
:
966 if (info
->executable
)
969 to_type
= R_X86_64_TPOFF32
;
971 to_type
= R_X86_64_GOTTPOFF
;
974 /* When we are called from elf64_x86_64_relocate_section,
975 CONTENTS isn't NULL and there may be additional transitions
976 based on TLS_TYPE. */
977 if (contents
!= NULL
)
979 unsigned int new_to_type
= to_type
;
984 && tls_type
== GOT_TLS_IE
)
985 new_to_type
= R_X86_64_TPOFF32
;
987 if (to_type
== R_X86_64_TLSGD
988 || to_type
== R_X86_64_GOTPC32_TLSDESC
989 || to_type
== R_X86_64_TLSDESC_CALL
)
991 if (tls_type
== GOT_TLS_IE
)
992 new_to_type
= R_X86_64_GOTTPOFF
;
995 /* We checked the transition before when we were called from
996 elf64_x86_64_check_relocs. We only want to check the new
997 transition which hasn't been checked before. */
998 check
= new_to_type
!= to_type
&& from_type
== to_type
;
999 to_type
= new_to_type
;
1004 case R_X86_64_TLSLD
:
1005 if (info
->executable
)
1006 to_type
= R_X86_64_TPOFF32
;
1013 /* Return TRUE if there is no transition. */
1014 if (from_type
== to_type
)
1017 /* Check if the transition can be performed. */
1019 && ! elf64_x86_64_check_tls_transition (abfd
, sec
, contents
,
1020 symtab_hdr
, sym_hashes
,
1021 from_type
, rel
, relend
))
1023 reloc_howto_type
*from
, *to
;
1026 from
= elf64_x86_64_rtype_to_howto (abfd
, from_type
);
1027 to
= elf64_x86_64_rtype_to_howto (abfd
, to_type
);
1030 name
= h
->root
.root
.string
;
1033 struct elf64_x86_64_link_hash_table
*htab
;
1035 htab
= elf64_x86_64_hash_table (info
);
1040 Elf_Internal_Sym
*isym
;
1042 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1044 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1048 (*_bfd_error_handler
)
1049 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1050 "in section `%A' failed"),
1051 abfd
, sec
, from
->name
, to
->name
, name
,
1052 (unsigned long) rel
->r_offset
);
1053 bfd_set_error (bfd_error_bad_value
);
1061 /* Look through the relocs for a section during the first phase, and
1062 calculate needed space in the global offset table, procedure
1063 linkage table, and dynamic reloc sections. */
1066 elf64_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1068 const Elf_Internal_Rela
*relocs
)
1070 struct elf64_x86_64_link_hash_table
*htab
;
1071 Elf_Internal_Shdr
*symtab_hdr
;
1072 struct elf_link_hash_entry
**sym_hashes
;
1073 const Elf_Internal_Rela
*rel
;
1074 const Elf_Internal_Rela
*rel_end
;
1077 if (info
->relocatable
)
1080 BFD_ASSERT (is_x86_64_elf (abfd
));
1082 htab
= elf64_x86_64_hash_table (info
);
1086 symtab_hdr
= &elf_symtab_hdr (abfd
);
1087 sym_hashes
= elf_sym_hashes (abfd
);
1091 rel_end
= relocs
+ sec
->reloc_count
;
1092 for (rel
= relocs
; rel
< rel_end
; rel
++)
1094 unsigned int r_type
;
1095 unsigned long r_symndx
;
1096 struct elf_link_hash_entry
*h
;
1097 Elf_Internal_Sym
*isym
;
1100 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1101 r_type
= ELF64_R_TYPE (rel
->r_info
);
1103 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1105 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1110 if (r_symndx
< symtab_hdr
->sh_info
)
1112 /* A local symbol. */
1113 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1118 /* Check relocation against local STT_GNU_IFUNC symbol. */
1119 if (ELF64_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1121 h
= elf64_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1126 /* Fake a STT_GNU_IFUNC symbol. */
1127 h
->type
= STT_GNU_IFUNC
;
1130 h
->forced_local
= 1;
1131 h
->root
.type
= bfd_link_hash_defined
;
1139 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1140 while (h
->root
.type
== bfd_link_hash_indirect
1141 || h
->root
.type
== bfd_link_hash_warning
)
1142 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1147 /* Create the ifunc sections for static executables. If we
1148 never see an indirect function symbol nor we are building
1149 a static executable, those sections will be empty and
1150 won't appear in output. */
1161 case R_X86_64_PLT32
:
1162 case R_X86_64_GOTPCREL
:
1163 case R_X86_64_GOTPCREL64
:
1164 if (!_bfd_elf_create_ifunc_sections (abfd
, info
))
1169 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1170 it here if it is defined in a non-shared object. */
1171 if (h
->type
== STT_GNU_IFUNC
1174 /* It is referenced by a non-shared object. */
1178 /* STT_GNU_IFUNC symbol must go through PLT. */
1179 h
->plt
.refcount
+= 1;
1181 /* STT_GNU_IFUNC needs dynamic sections. */
1182 if (htab
->elf
.dynobj
== NULL
)
1183 htab
->elf
.dynobj
= abfd
;
1188 if (h
->root
.root
.string
)
1189 name
= h
->root
.root
.string
;
1191 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1193 (*_bfd_error_handler
)
1194 (_("%B: relocation %s against STT_GNU_IFUNC "
1195 "symbol `%s' isn't handled by %s"), abfd
,
1196 x86_64_elf_howto_table
[r_type
].name
,
1197 name
, __FUNCTION__
);
1198 bfd_set_error (bfd_error_bad_value
);
1203 h
->pointer_equality_needed
= 1;
1206 /* We must copy these reloc types into the output
1207 file. Create a reloc section in dynobj and
1208 make room for this reloc. */
1209 sreloc
= _bfd_elf_create_ifunc_dyn_reloc
1210 (abfd
, info
, sec
, sreloc
,
1211 &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
);
1222 if (r_type
!= R_X86_64_PC32
1223 && r_type
!= R_X86_64_PC64
)
1224 h
->pointer_equality_needed
= 1;
1227 case R_X86_64_PLT32
:
1230 case R_X86_64_GOTPCREL
:
1231 case R_X86_64_GOTPCREL64
:
1232 h
->got
.refcount
+= 1;
1233 if (htab
->elf
.sgot
== NULL
1234 && !_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1244 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1245 symtab_hdr
, sym_hashes
,
1246 &r_type
, GOT_UNKNOWN
,
1247 rel
, rel_end
, h
, r_symndx
))
1252 case R_X86_64_TLSLD
:
1253 htab
->tls_ld_got
.refcount
+= 1;
1256 case R_X86_64_TPOFF32
:
1257 if (!info
->executable
)
1260 name
= h
->root
.root
.string
;
1262 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1264 (*_bfd_error_handler
)
1265 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1267 x86_64_elf_howto_table
[r_type
].name
, name
);
1268 bfd_set_error (bfd_error_bad_value
);
1273 case R_X86_64_GOTTPOFF
:
1274 if (!info
->executable
)
1275 info
->flags
|= DF_STATIC_TLS
;
1278 case R_X86_64_GOT32
:
1279 case R_X86_64_GOTPCREL
:
1280 case R_X86_64_TLSGD
:
1281 case R_X86_64_GOT64
:
1282 case R_X86_64_GOTPCREL64
:
1283 case R_X86_64_GOTPLT64
:
1284 case R_X86_64_GOTPC32_TLSDESC
:
1285 case R_X86_64_TLSDESC_CALL
:
1286 /* This symbol requires a global offset table entry. */
1288 int tls_type
, old_tls_type
;
1292 default: tls_type
= GOT_NORMAL
; break;
1293 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1294 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1295 case R_X86_64_GOTPC32_TLSDESC
:
1296 case R_X86_64_TLSDESC_CALL
:
1297 tls_type
= GOT_TLS_GDESC
; break;
1302 if (r_type
== R_X86_64_GOTPLT64
)
1304 /* This relocation indicates that we also need
1305 a PLT entry, as this is a function. We don't need
1306 a PLT entry for local symbols. */
1308 h
->plt
.refcount
+= 1;
1310 h
->got
.refcount
+= 1;
1311 old_tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1315 bfd_signed_vma
*local_got_refcounts
;
1317 /* This is a global offset table entry for a local symbol. */
1318 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1319 if (local_got_refcounts
== NULL
)
1323 size
= symtab_hdr
->sh_info
;
1324 size
*= sizeof (bfd_signed_vma
)
1325 + sizeof (bfd_vma
) + sizeof (char);
1326 local_got_refcounts
= ((bfd_signed_vma
*)
1327 bfd_zalloc (abfd
, size
));
1328 if (local_got_refcounts
== NULL
)
1330 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1331 elf64_x86_64_local_tlsdesc_gotent (abfd
)
1332 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1333 elf64_x86_64_local_got_tls_type (abfd
)
1334 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1336 local_got_refcounts
[r_symndx
] += 1;
1338 = elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1341 /* If a TLS symbol is accessed using IE at least once,
1342 there is no point to use dynamic model for it. */
1343 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1344 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1345 || tls_type
!= GOT_TLS_IE
))
1347 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1348 tls_type
= old_tls_type
;
1349 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1350 && GOT_TLS_GD_ANY_P (tls_type
))
1351 tls_type
|= old_tls_type
;
1355 name
= h
->root
.root
.string
;
1357 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1359 (*_bfd_error_handler
)
1360 (_("%B: '%s' accessed both as normal and thread local symbol"),
1366 if (old_tls_type
!= tls_type
)
1369 elf64_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1371 elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1376 case R_X86_64_GOTOFF64
:
1377 case R_X86_64_GOTPC32
:
1378 case R_X86_64_GOTPC64
:
1380 if (htab
->elf
.sgot
== NULL
)
1382 if (htab
->elf
.dynobj
== NULL
)
1383 htab
->elf
.dynobj
= abfd
;
1384 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1390 case R_X86_64_PLT32
:
1391 /* This symbol requires a procedure linkage table entry. We
1392 actually build the entry in adjust_dynamic_symbol,
1393 because this might be a case of linking PIC code which is
1394 never referenced by a dynamic object, in which case we
1395 don't need to generate a procedure linkage table entry
1398 /* If this is a local symbol, we resolve it directly without
1399 creating a procedure linkage table entry. */
1404 h
->plt
.refcount
+= 1;
1407 case R_X86_64_PLTOFF64
:
1408 /* This tries to form the 'address' of a function relative
1409 to GOT. For global symbols we need a PLT entry. */
1413 h
->plt
.refcount
+= 1;
1421 /* Let's help debug shared library creation. These relocs
1422 cannot be used in shared libs. Don't error out for
1423 sections we don't care about, such as debug sections or
1424 non-constant sections. */
1426 && (sec
->flags
& SEC_ALLOC
) != 0
1427 && (sec
->flags
& SEC_READONLY
) != 0)
1430 name
= h
->root
.root
.string
;
1432 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1433 (*_bfd_error_handler
)
1434 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1435 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1436 bfd_set_error (bfd_error_bad_value
);
1446 if (h
!= NULL
&& info
->executable
)
1448 /* If this reloc is in a read-only section, we might
1449 need a copy reloc. We can't check reliably at this
1450 stage whether the section is read-only, as input
1451 sections have not yet been mapped to output sections.
1452 Tentatively set the flag for now, and correct in
1453 adjust_dynamic_symbol. */
1456 /* We may need a .plt entry if the function this reloc
1457 refers to is in a shared lib. */
1458 h
->plt
.refcount
+= 1;
1459 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1460 h
->pointer_equality_needed
= 1;
1463 /* If we are creating a shared library, and this is a reloc
1464 against a global symbol, or a non PC relative reloc
1465 against a local symbol, then we need to copy the reloc
1466 into the shared library. However, if we are linking with
1467 -Bsymbolic, we do not need to copy a reloc against a
1468 global symbol which is defined in an object we are
1469 including in the link (i.e., DEF_REGULAR is set). At
1470 this point we have not seen all the input files, so it is
1471 possible that DEF_REGULAR is not set now but will be set
1472 later (it is never cleared). In case of a weak definition,
1473 DEF_REGULAR may be cleared later by a strong definition in
1474 a shared library. We account for that possibility below by
1475 storing information in the relocs_copied field of the hash
1476 table entry. A similar situation occurs when creating
1477 shared libraries and symbol visibility changes render the
1480 If on the other hand, we are creating an executable, we
1481 may need to keep relocations for symbols satisfied by a
1482 dynamic library if we manage to avoid copy relocs for the
1485 && (sec
->flags
& SEC_ALLOC
) != 0
1486 && (! IS_X86_64_PCREL_TYPE (r_type
)
1488 && (! SYMBOLIC_BIND (info
, h
)
1489 || h
->root
.type
== bfd_link_hash_defweak
1490 || !h
->def_regular
))))
1491 || (ELIMINATE_COPY_RELOCS
1493 && (sec
->flags
& SEC_ALLOC
) != 0
1495 && (h
->root
.type
== bfd_link_hash_defweak
1496 || !h
->def_regular
)))
1498 struct elf_dyn_relocs
*p
;
1499 struct elf_dyn_relocs
**head
;
1501 /* We must copy these reloc types into the output file.
1502 Create a reloc section in dynobj and make room for
1506 if (htab
->elf
.dynobj
== NULL
)
1507 htab
->elf
.dynobj
= abfd
;
1509 sreloc
= _bfd_elf_make_dynamic_reloc_section
1510 (sec
, htab
->elf
.dynobj
, 3, abfd
, /*rela?*/ TRUE
);
1516 /* If this is a global symbol, we count the number of
1517 relocations we need for this symbol. */
1520 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1524 /* Track dynamic relocs needed for local syms too.
1525 We really need local syms available to do this
1530 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1535 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1539 /* Beware of type punned pointers vs strict aliasing
1541 vpp
= &(elf_section_data (s
)->local_dynrel
);
1542 head
= (struct elf_dyn_relocs
**)vpp
;
1546 if (p
== NULL
|| p
->sec
!= sec
)
1548 bfd_size_type amt
= sizeof *p
;
1550 p
= ((struct elf_dyn_relocs
*)
1551 bfd_alloc (htab
->elf
.dynobj
, amt
));
1562 if (IS_X86_64_PCREL_TYPE (r_type
))
1567 /* This relocation describes the C++ object vtable hierarchy.
1568 Reconstruct it for later use during GC. */
1569 case R_X86_64_GNU_VTINHERIT
:
1570 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1574 /* This relocation describes which C++ vtable entries are actually
1575 used. Record for later use during GC. */
1576 case R_X86_64_GNU_VTENTRY
:
1577 BFD_ASSERT (h
!= NULL
);
1579 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1591 /* Return the section that should be marked against GC for a given
1595 elf64_x86_64_gc_mark_hook (asection
*sec
,
1596 struct bfd_link_info
*info
,
1597 Elf_Internal_Rela
*rel
,
1598 struct elf_link_hash_entry
*h
,
1599 Elf_Internal_Sym
*sym
)
1602 switch (ELF64_R_TYPE (rel
->r_info
))
1604 case R_X86_64_GNU_VTINHERIT
:
1605 case R_X86_64_GNU_VTENTRY
:
1609 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1612 /* Update the got entry reference counts for the section being removed. */
1615 elf64_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1617 const Elf_Internal_Rela
*relocs
)
1619 struct elf64_x86_64_link_hash_table
*htab
;
1620 Elf_Internal_Shdr
*symtab_hdr
;
1621 struct elf_link_hash_entry
**sym_hashes
;
1622 bfd_signed_vma
*local_got_refcounts
;
1623 const Elf_Internal_Rela
*rel
, *relend
;
1625 if (info
->relocatable
)
1628 htab
= elf64_x86_64_hash_table (info
);
1632 elf_section_data (sec
)->local_dynrel
= NULL
;
1634 symtab_hdr
= &elf_symtab_hdr (abfd
);
1635 sym_hashes
= elf_sym_hashes (abfd
);
1636 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1638 relend
= relocs
+ sec
->reloc_count
;
1639 for (rel
= relocs
; rel
< relend
; rel
++)
1641 unsigned long r_symndx
;
1642 unsigned int r_type
;
1643 struct elf_link_hash_entry
*h
= NULL
;
1645 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1646 if (r_symndx
>= symtab_hdr
->sh_info
)
1648 struct elf64_x86_64_link_hash_entry
*eh
;
1649 struct elf_dyn_relocs
**pp
;
1650 struct elf_dyn_relocs
*p
;
1652 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1653 while (h
->root
.type
== bfd_link_hash_indirect
1654 || h
->root
.type
== bfd_link_hash_warning
)
1655 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1656 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1658 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1661 /* Everything must go for SEC. */
1668 /* A local symbol. */
1669 Elf_Internal_Sym
*isym
;
1671 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1674 /* Check relocation against local STT_GNU_IFUNC symbol. */
1676 && ELF64_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1678 h
= elf64_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1685 r_type
= ELF64_R_TYPE (rel
->r_info
);
1686 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1687 symtab_hdr
, sym_hashes
,
1688 &r_type
, GOT_UNKNOWN
,
1689 rel
, relend
, h
, r_symndx
))
1694 case R_X86_64_TLSLD
:
1695 if (htab
->tls_ld_got
.refcount
> 0)
1696 htab
->tls_ld_got
.refcount
-= 1;
1699 case R_X86_64_TLSGD
:
1700 case R_X86_64_GOTPC32_TLSDESC
:
1701 case R_X86_64_TLSDESC_CALL
:
1702 case R_X86_64_GOTTPOFF
:
1703 case R_X86_64_GOT32
:
1704 case R_X86_64_GOTPCREL
:
1705 case R_X86_64_GOT64
:
1706 case R_X86_64_GOTPCREL64
:
1707 case R_X86_64_GOTPLT64
:
1710 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1711 h
->plt
.refcount
-= 1;
1712 if (h
->got
.refcount
> 0)
1713 h
->got
.refcount
-= 1;
1714 if (h
->type
== STT_GNU_IFUNC
)
1716 if (h
->plt
.refcount
> 0)
1717 h
->plt
.refcount
-= 1;
1720 else if (local_got_refcounts
!= NULL
)
1722 if (local_got_refcounts
[r_symndx
] > 0)
1723 local_got_refcounts
[r_symndx
] -= 1;
1740 case R_X86_64_PLT32
:
1741 case R_X86_64_PLTOFF64
:
1744 if (h
->plt
.refcount
> 0)
1745 h
->plt
.refcount
-= 1;
1757 /* Adjust a symbol defined by a dynamic object and referenced by a
1758 regular object. The current definition is in some section of the
1759 dynamic object, but we're not including those sections. We have to
1760 change the definition to something the rest of the link can
1764 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1765 struct elf_link_hash_entry
*h
)
1767 struct elf64_x86_64_link_hash_table
*htab
;
1770 /* STT_GNU_IFUNC symbol must go through PLT. */
1771 if (h
->type
== STT_GNU_IFUNC
)
1773 if (h
->plt
.refcount
<= 0)
1775 h
->plt
.offset
= (bfd_vma
) -1;
1781 /* If this is a function, put it in the procedure linkage table. We
1782 will fill in the contents of the procedure linkage table later,
1783 when we know the address of the .got section. */
1784 if (h
->type
== STT_FUNC
1787 if (h
->plt
.refcount
<= 0
1788 || SYMBOL_CALLS_LOCAL (info
, h
)
1789 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1790 && h
->root
.type
== bfd_link_hash_undefweak
))
1792 /* This case can occur if we saw a PLT32 reloc in an input
1793 file, but the symbol was never referred to by a dynamic
1794 object, or if all references were garbage collected. In
1795 such a case, we don't actually need to build a procedure
1796 linkage table, and we can just do a PC32 reloc instead. */
1797 h
->plt
.offset
= (bfd_vma
) -1;
1804 /* It's possible that we incorrectly decided a .plt reloc was
1805 needed for an R_X86_64_PC32 reloc to a non-function sym in
1806 check_relocs. We can't decide accurately between function and
1807 non-function syms in check-relocs; Objects loaded later in
1808 the link may change h->type. So fix it now. */
1809 h
->plt
.offset
= (bfd_vma
) -1;
1811 /* If this is a weak symbol, and there is a real definition, the
1812 processor independent code will have arranged for us to see the
1813 real definition first, and we can just use the same value. */
1814 if (h
->u
.weakdef
!= NULL
)
1816 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1817 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1818 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1819 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1820 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1821 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1825 /* This is a reference to a symbol defined by a dynamic object which
1826 is not a function. */
1828 /* If we are creating a shared library, we must presume that the
1829 only references to the symbol are via the global offset table.
1830 For such cases we need not do anything here; the relocations will
1831 be handled correctly by relocate_section. */
1835 /* If there are no references to this symbol that do not use the
1836 GOT, we don't need to generate a copy reloc. */
1837 if (!h
->non_got_ref
)
1840 /* If -z nocopyreloc was given, we won't generate them either. */
1841 if (info
->nocopyreloc
)
1847 if (ELIMINATE_COPY_RELOCS
)
1849 struct elf64_x86_64_link_hash_entry
* eh
;
1850 struct elf_dyn_relocs
*p
;
1852 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1853 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1855 s
= p
->sec
->output_section
;
1856 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1860 /* If we didn't find any dynamic relocs in read-only sections, then
1861 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1871 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1872 h
->root
.root
.string
);
1876 /* We must allocate the symbol in our .dynbss section, which will
1877 become part of the .bss section of the executable. There will be
1878 an entry for this symbol in the .dynsym section. The dynamic
1879 object will contain position independent code, so all references
1880 from the dynamic object to this symbol will go through the global
1881 offset table. The dynamic linker will use the .dynsym entry to
1882 determine the address it must put in the global offset table, so
1883 both the dynamic object and the regular object will refer to the
1884 same memory location for the variable. */
1886 htab
= elf64_x86_64_hash_table (info
);
1890 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1891 to copy the initial value out of the dynamic object and into the
1892 runtime process image. */
1893 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1895 htab
->srelbss
->size
+= sizeof (Elf64_External_Rela
);
1901 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1904 /* Allocate space in .plt, .got and associated reloc sections for
1908 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1910 struct bfd_link_info
*info
;
1911 struct elf64_x86_64_link_hash_table
*htab
;
1912 struct elf64_x86_64_link_hash_entry
*eh
;
1913 struct elf_dyn_relocs
*p
;
1915 if (h
->root
.type
== bfd_link_hash_indirect
)
1918 if (h
->root
.type
== bfd_link_hash_warning
)
1919 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1920 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1922 info
= (struct bfd_link_info
*) inf
;
1923 htab
= elf64_x86_64_hash_table (info
);
1927 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1928 here if it is defined and referenced in a non-shared object. */
1929 if (h
->type
== STT_GNU_IFUNC
1931 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
1935 else if (htab
->elf
.dynamic_sections_created
1936 && h
->plt
.refcount
> 0)
1938 /* Make sure this symbol is output as a dynamic symbol.
1939 Undefined weak syms won't yet be marked as dynamic. */
1940 if (h
->dynindx
== -1
1941 && !h
->forced_local
)
1943 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1948 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1950 asection
*s
= htab
->elf
.splt
;
1952 /* If this is the first .plt entry, make room for the special
1955 s
->size
+= PLT_ENTRY_SIZE
;
1957 h
->plt
.offset
= s
->size
;
1959 /* If this symbol is not defined in a regular file, and we are
1960 not generating a shared library, then set the symbol to this
1961 location in the .plt. This is required to make function
1962 pointers compare as equal between the normal executable and
1963 the shared library. */
1967 h
->root
.u
.def
.section
= s
;
1968 h
->root
.u
.def
.value
= h
->plt
.offset
;
1971 /* Make room for this entry. */
1972 s
->size
+= PLT_ENTRY_SIZE
;
1974 /* We also need to make an entry in the .got.plt section, which
1975 will be placed in the .got section by the linker script. */
1976 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
1978 /* We also need to make an entry in the .rela.plt section. */
1979 htab
->elf
.srelplt
->size
+= sizeof (Elf64_External_Rela
);
1980 htab
->elf
.srelplt
->reloc_count
++;
1984 h
->plt
.offset
= (bfd_vma
) -1;
1990 h
->plt
.offset
= (bfd_vma
) -1;
1994 eh
->tlsdesc_got
= (bfd_vma
) -1;
1996 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1997 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1998 if (h
->got
.refcount
> 0
2001 && elf64_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2003 h
->got
.offset
= (bfd_vma
) -1;
2005 else if (h
->got
.refcount
> 0)
2009 int tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
2011 /* Make sure this symbol is output as a dynamic symbol.
2012 Undefined weak syms won't yet be marked as dynamic. */
2013 if (h
->dynindx
== -1
2014 && !h
->forced_local
)
2016 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2020 if (GOT_TLS_GDESC_P (tls_type
))
2022 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2023 - elf64_x86_64_compute_jump_table_size (htab
);
2024 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2025 h
->got
.offset
= (bfd_vma
) -2;
2027 if (! GOT_TLS_GDESC_P (tls_type
)
2028 || GOT_TLS_GD_P (tls_type
))
2031 h
->got
.offset
= s
->size
;
2032 s
->size
+= GOT_ENTRY_SIZE
;
2033 if (GOT_TLS_GD_P (tls_type
))
2034 s
->size
+= GOT_ENTRY_SIZE
;
2036 dyn
= htab
->elf
.dynamic_sections_created
;
2037 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2039 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2040 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2041 || tls_type
== GOT_TLS_IE
)
2042 htab
->elf
.srelgot
->size
+= sizeof (Elf64_External_Rela
);
2043 else if (GOT_TLS_GD_P (tls_type
))
2044 htab
->elf
.srelgot
->size
+= 2 * sizeof (Elf64_External_Rela
);
2045 else if (! GOT_TLS_GDESC_P (tls_type
)
2046 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2047 || h
->root
.type
!= bfd_link_hash_undefweak
)
2049 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2050 htab
->elf
.srelgot
->size
+= sizeof (Elf64_External_Rela
);
2051 if (GOT_TLS_GDESC_P (tls_type
))
2053 htab
->elf
.srelplt
->size
+= sizeof (Elf64_External_Rela
);
2054 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2058 h
->got
.offset
= (bfd_vma
) -1;
2060 if (eh
->dyn_relocs
== NULL
)
2063 /* In the shared -Bsymbolic case, discard space allocated for
2064 dynamic pc-relative relocs against symbols which turn out to be
2065 defined in regular objects. For the normal shared case, discard
2066 space for pc-relative relocs that have become local due to symbol
2067 visibility changes. */
2071 /* Relocs that use pc_count are those that appear on a call
2072 insn, or certain REL relocs that can generated via assembly.
2073 We want calls to protected symbols to resolve directly to the
2074 function rather than going via the plt. If people want
2075 function pointer comparisons to work as expected then they
2076 should avoid writing weird assembly. */
2077 if (SYMBOL_CALLS_LOCAL (info
, h
))
2079 struct elf_dyn_relocs
**pp
;
2081 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2083 p
->count
-= p
->pc_count
;
2092 /* Also discard relocs on undefined weak syms with non-default
2094 if (eh
->dyn_relocs
!= NULL
2095 && h
->root
.type
== bfd_link_hash_undefweak
)
2097 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2098 eh
->dyn_relocs
= NULL
;
2100 /* Make sure undefined weak symbols are output as a dynamic
2102 else if (h
->dynindx
== -1
2103 && ! h
->forced_local
2104 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2109 else if (ELIMINATE_COPY_RELOCS
)
2111 /* For the non-shared case, discard space for relocs against
2112 symbols which turn out to need copy relocs or are not
2118 || (htab
->elf
.dynamic_sections_created
2119 && (h
->root
.type
== bfd_link_hash_undefweak
2120 || h
->root
.type
== bfd_link_hash_undefined
))))
2122 /* Make sure this symbol is output as a dynamic symbol.
2123 Undefined weak syms won't yet be marked as dynamic. */
2124 if (h
->dynindx
== -1
2125 && ! h
->forced_local
2126 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2129 /* If that succeeded, we know we'll be keeping all the
2131 if (h
->dynindx
!= -1)
2135 eh
->dyn_relocs
= NULL
;
2140 /* Finally, allocate space. */
2141 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2145 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2147 BFD_ASSERT (sreloc
!= NULL
);
2149 sreloc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2155 /* Allocate space in .plt, .got and associated reloc sections for
2156 local dynamic relocs. */
2159 elf64_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2161 struct elf_link_hash_entry
*h
2162 = (struct elf_link_hash_entry
*) *slot
;
2164 if (h
->type
!= STT_GNU_IFUNC
2168 || h
->root
.type
!= bfd_link_hash_defined
)
2171 return elf64_x86_64_allocate_dynrelocs (h
, inf
);
2174 /* Find any dynamic relocs that apply to read-only sections. */
2177 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2179 struct elf64_x86_64_link_hash_entry
*eh
;
2180 struct elf_dyn_relocs
*p
;
2182 if (h
->root
.type
== bfd_link_hash_warning
)
2183 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2185 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
2186 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2188 asection
*s
= p
->sec
->output_section
;
2190 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2192 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2194 info
->flags
|= DF_TEXTREL
;
2196 /* Not an error, just cut short the traversal. */
2203 /* Set the sizes of the dynamic sections. */
2206 elf64_x86_64_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2207 struct bfd_link_info
*info
)
2209 struct elf64_x86_64_link_hash_table
*htab
;
2215 htab
= elf64_x86_64_hash_table (info
);
2219 dynobj
= htab
->elf
.dynobj
;
2223 if (htab
->elf
.dynamic_sections_created
)
2225 /* Set the contents of the .interp section to the interpreter. */
2226 if (info
->executable
)
2228 s
= bfd_get_section_by_name (dynobj
, ".interp");
2231 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
2232 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
2236 /* Set up .got offsets for local syms, and space for local dynamic
2238 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2240 bfd_signed_vma
*local_got
;
2241 bfd_signed_vma
*end_local_got
;
2242 char *local_tls_type
;
2243 bfd_vma
*local_tlsdesc_gotent
;
2244 bfd_size_type locsymcount
;
2245 Elf_Internal_Shdr
*symtab_hdr
;
2248 if (! is_x86_64_elf (ibfd
))
2251 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2253 struct elf_dyn_relocs
*p
;
2255 for (p
= (struct elf_dyn_relocs
*)
2256 (elf_section_data (s
)->local_dynrel
);
2260 if (!bfd_is_abs_section (p
->sec
)
2261 && bfd_is_abs_section (p
->sec
->output_section
))
2263 /* Input section has been discarded, either because
2264 it is a copy of a linkonce section or due to
2265 linker script /DISCARD/, so we'll be discarding
2268 else if (p
->count
!= 0)
2270 srel
= elf_section_data (p
->sec
)->sreloc
;
2271 srel
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2272 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2273 info
->flags
|= DF_TEXTREL
;
2278 local_got
= elf_local_got_refcounts (ibfd
);
2282 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2283 locsymcount
= symtab_hdr
->sh_info
;
2284 end_local_got
= local_got
+ locsymcount
;
2285 local_tls_type
= elf64_x86_64_local_got_tls_type (ibfd
);
2286 local_tlsdesc_gotent
= elf64_x86_64_local_tlsdesc_gotent (ibfd
);
2288 srel
= htab
->elf
.srelgot
;
2289 for (; local_got
< end_local_got
;
2290 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2292 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2295 if (GOT_TLS_GDESC_P (*local_tls_type
))
2297 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2298 - elf64_x86_64_compute_jump_table_size (htab
);
2299 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2300 *local_got
= (bfd_vma
) -2;
2302 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2303 || GOT_TLS_GD_P (*local_tls_type
))
2305 *local_got
= s
->size
;
2306 s
->size
+= GOT_ENTRY_SIZE
;
2307 if (GOT_TLS_GD_P (*local_tls_type
))
2308 s
->size
+= GOT_ENTRY_SIZE
;
2311 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2312 || *local_tls_type
== GOT_TLS_IE
)
2314 if (GOT_TLS_GDESC_P (*local_tls_type
))
2316 htab
->elf
.srelplt
->size
2317 += sizeof (Elf64_External_Rela
);
2318 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2320 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2321 || GOT_TLS_GD_P (*local_tls_type
))
2322 srel
->size
+= sizeof (Elf64_External_Rela
);
2326 *local_got
= (bfd_vma
) -1;
2330 if (htab
->tls_ld_got
.refcount
> 0)
2332 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2334 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2335 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2336 htab
->elf
.srelgot
->size
+= sizeof (Elf64_External_Rela
);
2339 htab
->tls_ld_got
.offset
= -1;
2341 /* Allocate global sym .plt and .got entries, and space for global
2342 sym dynamic relocs. */
2343 elf_link_hash_traverse (&htab
->elf
, elf64_x86_64_allocate_dynrelocs
,
2346 /* Allocate .plt and .got entries, and space for local symbols. */
2347 htab_traverse (htab
->loc_hash_table
,
2348 elf64_x86_64_allocate_local_dynrelocs
,
2351 /* For every jump slot reserved in the sgotplt, reloc_count is
2352 incremented. However, when we reserve space for TLS descriptors,
2353 it's not incremented, so in order to compute the space reserved
2354 for them, it suffices to multiply the reloc count by the jump
2356 if (htab
->elf
.srelplt
)
2357 htab
->sgotplt_jump_table_size
2358 = elf64_x86_64_compute_jump_table_size (htab
);
2360 if (htab
->tlsdesc_plt
)
2362 /* If we're not using lazy TLS relocations, don't generate the
2363 PLT and GOT entries they require. */
2364 if ((info
->flags
& DF_BIND_NOW
))
2365 htab
->tlsdesc_plt
= 0;
2368 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2369 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2370 /* Reserve room for the initial entry.
2371 FIXME: we could probably do away with it in this case. */
2372 if (htab
->elf
.splt
->size
== 0)
2373 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2374 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2375 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2379 if (htab
->elf
.sgotplt
)
2381 /* Don't allocate .got.plt section if there are no GOT nor PLT
2383 if ((htab
->elf
.sgotplt
->size
2384 == get_elf_backend_data (output_bfd
)->got_header_size
)
2385 && (htab
->elf
.splt
== NULL
2386 || htab
->elf
.splt
->size
== 0)
2387 && (htab
->elf
.sgot
== NULL
2388 || htab
->elf
.sgot
->size
== 0)
2389 && (htab
->elf
.iplt
== NULL
2390 || htab
->elf
.iplt
->size
== 0)
2391 && (htab
->elf
.igotplt
== NULL
2392 || htab
->elf
.igotplt
->size
== 0))
2393 htab
->elf
.sgotplt
->size
= 0;
2396 /* We now have determined the sizes of the various dynamic sections.
2397 Allocate memory for them. */
2399 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2401 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2404 if (s
== htab
->elf
.splt
2405 || s
== htab
->elf
.sgot
2406 || s
== htab
->elf
.sgotplt
2407 || s
== htab
->elf
.iplt
2408 || s
== htab
->elf
.igotplt
2409 || s
== htab
->sdynbss
)
2411 /* Strip this section if we don't need it; see the
2414 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2416 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2419 /* We use the reloc_count field as a counter if we need
2420 to copy relocs into the output file. */
2421 if (s
!= htab
->elf
.srelplt
)
2426 /* It's not one of our sections, so don't allocate space. */
2432 /* If we don't need this section, strip it from the
2433 output file. This is mostly to handle .rela.bss and
2434 .rela.plt. We must create both sections in
2435 create_dynamic_sections, because they must be created
2436 before the linker maps input sections to output
2437 sections. The linker does that before
2438 adjust_dynamic_symbol is called, and it is that
2439 function which decides whether anything needs to go
2440 into these sections. */
2442 s
->flags
|= SEC_EXCLUDE
;
2446 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2449 /* Allocate memory for the section contents. We use bfd_zalloc
2450 here in case unused entries are not reclaimed before the
2451 section's contents are written out. This should not happen,
2452 but this way if it does, we get a R_X86_64_NONE reloc instead
2454 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2455 if (s
->contents
== NULL
)
2459 if (htab
->elf
.dynamic_sections_created
)
2461 /* Add some entries to the .dynamic section. We fill in the
2462 values later, in elf64_x86_64_finish_dynamic_sections, but we
2463 must add the entries now so that we get the correct size for
2464 the .dynamic section. The DT_DEBUG entry is filled in by the
2465 dynamic linker and used by the debugger. */
2466 #define add_dynamic_entry(TAG, VAL) \
2467 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2469 if (info
->executable
)
2471 if (!add_dynamic_entry (DT_DEBUG
, 0))
2475 if (htab
->elf
.splt
->size
!= 0)
2477 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2478 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2479 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2480 || !add_dynamic_entry (DT_JMPREL
, 0))
2483 if (htab
->tlsdesc_plt
2484 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2485 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2491 if (!add_dynamic_entry (DT_RELA
, 0)
2492 || !add_dynamic_entry (DT_RELASZ
, 0)
2493 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf64_External_Rela
)))
2496 /* If any dynamic relocs apply to a read-only section,
2497 then we need a DT_TEXTREL entry. */
2498 if ((info
->flags
& DF_TEXTREL
) == 0)
2499 elf_link_hash_traverse (&htab
->elf
,
2500 elf64_x86_64_readonly_dynrelocs
,
2503 if ((info
->flags
& DF_TEXTREL
) != 0)
2505 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2510 #undef add_dynamic_entry
2516 elf64_x86_64_always_size_sections (bfd
*output_bfd
,
2517 struct bfd_link_info
*info
)
2519 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2523 struct elf_link_hash_entry
*tlsbase
;
2525 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2526 "_TLS_MODULE_BASE_",
2527 FALSE
, FALSE
, FALSE
);
2529 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2531 struct elf64_x86_64_link_hash_table
*htab
;
2532 struct bfd_link_hash_entry
*bh
= NULL
;
2533 const struct elf_backend_data
*bed
2534 = get_elf_backend_data (output_bfd
);
2536 htab
= elf64_x86_64_hash_table (info
);
2540 if (!(_bfd_generic_link_add_one_symbol
2541 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2542 tls_sec
, 0, NULL
, FALSE
,
2543 bed
->collect
, &bh
)))
2546 htab
->tls_module_base
= bh
;
2548 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2549 tlsbase
->def_regular
= 1;
2550 tlsbase
->other
= STV_HIDDEN
;
2551 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2558 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2559 executables. Rather than setting it to the beginning of the TLS
2560 section, we have to set it to the end. This function may be called
2561 multiple times, it is idempotent. */
2564 elf64_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2566 struct elf64_x86_64_link_hash_table
*htab
;
2567 struct bfd_link_hash_entry
*base
;
2569 if (!info
->executable
)
2572 htab
= elf64_x86_64_hash_table (info
);
2576 base
= htab
->tls_module_base
;
2580 base
->u
.def
.value
= htab
->elf
.tls_size
;
2583 /* Return the base VMA address which should be subtracted from real addresses
2584 when resolving @dtpoff relocation.
2585 This is PT_TLS segment p_vaddr. */
2588 elf64_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2590 /* If tls_sec is NULL, we should have signalled an error already. */
2591 if (elf_hash_table (info
)->tls_sec
== NULL
)
2593 return elf_hash_table (info
)->tls_sec
->vma
;
2596 /* Return the relocation value for @tpoff relocation
2597 if STT_TLS virtual address is ADDRESS. */
2600 elf64_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2602 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2604 /* If tls_segment is NULL, we should have signalled an error already. */
2605 if (htab
->tls_sec
== NULL
)
2607 return address
- htab
->tls_size
- htab
->tls_sec
->vma
;
2610 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2614 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2616 /* Opcode Instruction
2619 0x0f 0x8x conditional jump */
2621 && (contents
[offset
- 1] == 0xe8
2622 || contents
[offset
- 1] == 0xe9))
2624 && contents
[offset
- 2] == 0x0f
2625 && (contents
[offset
- 1] & 0xf0) == 0x80));
2629 elf64_x86_64_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
2631 bfd_byte
*loc
= s
->contents
;
2632 loc
+= s
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2633 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
2634 <= s
->contents
+ s
->size
);
2635 bfd_elf64_swap_reloca_out (abfd
, rel
, loc
);
2638 /* Relocate an x86_64 ELF section. */
2641 elf64_x86_64_relocate_section (bfd
*output_bfd
, struct bfd_link_info
*info
,
2642 bfd
*input_bfd
, asection
*input_section
,
2643 bfd_byte
*contents
, Elf_Internal_Rela
*relocs
,
2644 Elf_Internal_Sym
*local_syms
,
2645 asection
**local_sections
)
2647 struct elf64_x86_64_link_hash_table
*htab
;
2648 Elf_Internal_Shdr
*symtab_hdr
;
2649 struct elf_link_hash_entry
**sym_hashes
;
2650 bfd_vma
*local_got_offsets
;
2651 bfd_vma
*local_tlsdesc_gotents
;
2652 Elf_Internal_Rela
*rel
;
2653 Elf_Internal_Rela
*relend
;
2655 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2657 htab
= elf64_x86_64_hash_table (info
);
2660 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2661 sym_hashes
= elf_sym_hashes (input_bfd
);
2662 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2663 local_tlsdesc_gotents
= elf64_x86_64_local_tlsdesc_gotent (input_bfd
);
2665 elf64_x86_64_set_tls_module_base (info
);
2668 relend
= relocs
+ input_section
->reloc_count
;
2669 for (; rel
< relend
; rel
++)
2671 unsigned int r_type
;
2672 reloc_howto_type
*howto
;
2673 unsigned long r_symndx
;
2674 struct elf_link_hash_entry
*h
;
2675 Elf_Internal_Sym
*sym
;
2677 bfd_vma off
, offplt
;
2679 bfd_boolean unresolved_reloc
;
2680 bfd_reloc_status_type r
;
2684 r_type
= ELF64_R_TYPE (rel
->r_info
);
2685 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2686 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2689 if (r_type
>= R_X86_64_max
)
2691 bfd_set_error (bfd_error_bad_value
);
2695 howto
= x86_64_elf_howto_table
+ r_type
;
2696 r_symndx
= ELF64_R_SYM (rel
->r_info
);
2700 unresolved_reloc
= FALSE
;
2701 if (r_symndx
< symtab_hdr
->sh_info
)
2703 sym
= local_syms
+ r_symndx
;
2704 sec
= local_sections
[r_symndx
];
2706 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2709 /* Relocate against local STT_GNU_IFUNC symbol. */
2710 if (!info
->relocatable
2711 && ELF64_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2713 h
= elf64_x86_64_get_local_sym_hash (htab
, input_bfd
,
2718 /* Set STT_GNU_IFUNC symbol value. */
2719 h
->root
.u
.def
.value
= sym
->st_value
;
2720 h
->root
.u
.def
.section
= sec
;
2725 bfd_boolean warned ATTRIBUTE_UNUSED
;
2727 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2728 r_symndx
, symtab_hdr
, sym_hashes
,
2730 unresolved_reloc
, warned
);
2733 if (sec
!= NULL
&& elf_discarded_section (sec
))
2734 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2735 rel
, relend
, howto
, contents
);
2737 if (info
->relocatable
)
2740 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2741 it here if it is defined in a non-shared object. */
2743 && h
->type
== STT_GNU_IFUNC
2750 if ((input_section
->flags
& SEC_ALLOC
) == 0
2751 || h
->plt
.offset
== (bfd_vma
) -1)
2754 /* STT_GNU_IFUNC symbol must go through PLT. */
2755 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
2756 relocation
= (plt
->output_section
->vma
2757 + plt
->output_offset
+ h
->plt
.offset
);
2762 if (h
->root
.root
.string
)
2763 name
= h
->root
.root
.string
;
2765 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2767 (*_bfd_error_handler
)
2768 (_("%B: relocation %s against STT_GNU_IFUNC "
2769 "symbol `%s' isn't handled by %s"), input_bfd
,
2770 x86_64_elf_howto_table
[r_type
].name
,
2771 name
, __FUNCTION__
);
2772 bfd_set_error (bfd_error_bad_value
);
2781 if (rel
->r_addend
!= 0)
2783 if (h
->root
.root
.string
)
2784 name
= h
->root
.root
.string
;
2786 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2788 (*_bfd_error_handler
)
2789 (_("%B: relocation %s against STT_GNU_IFUNC "
2790 "symbol `%s' has non-zero addend: %d"),
2791 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2792 name
, rel
->r_addend
);
2793 bfd_set_error (bfd_error_bad_value
);
2797 /* Generate dynamic relcoation only when there is a
2798 non-GOF reference in a shared object. */
2799 if (info
->shared
&& h
->non_got_ref
)
2801 Elf_Internal_Rela outrel
;
2804 /* Need a dynamic relocation to get the real function
2806 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2810 if (outrel
.r_offset
== (bfd_vma
) -1
2811 || outrel
.r_offset
== (bfd_vma
) -2)
2814 outrel
.r_offset
+= (input_section
->output_section
->vma
2815 + input_section
->output_offset
);
2817 if (h
->dynindx
== -1
2819 || info
->executable
)
2821 /* This symbol is resolved locally. */
2822 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_IRELATIVE
);
2823 outrel
.r_addend
= (h
->root
.u
.def
.value
2824 + h
->root
.u
.def
.section
->output_section
->vma
2825 + h
->root
.u
.def
.section
->output_offset
);
2829 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
2830 outrel
.r_addend
= 0;
2833 sreloc
= htab
->elf
.irelifunc
;
2834 elf64_x86_64_append_rela (output_bfd
, sreloc
, &outrel
);
2836 /* If this reloc is against an external symbol, we
2837 do not want to fiddle with the addend. Otherwise,
2838 we need to include the symbol value so that it
2839 becomes an addend for the dynamic reloc. For an
2840 internal symbol, we have updated addend. */
2847 case R_X86_64_PLT32
:
2850 case R_X86_64_GOTPCREL
:
2851 case R_X86_64_GOTPCREL64
:
2852 base_got
= htab
->elf
.sgot
;
2853 off
= h
->got
.offset
;
2855 if (base_got
== NULL
)
2858 if (off
== (bfd_vma
) -1)
2860 /* We can't use h->got.offset here to save state, or
2861 even just remember the offset, as finish_dynamic_symbol
2862 would use that as offset into .got. */
2864 if (htab
->elf
.splt
!= NULL
)
2866 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2867 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2868 base_got
= htab
->elf
.sgotplt
;
2872 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
2873 off
= plt_index
* GOT_ENTRY_SIZE
;
2874 base_got
= htab
->elf
.igotplt
;
2877 if (h
->dynindx
== -1
2881 /* This references the local defitionion. We must
2882 initialize this entry in the global offset table.
2883 Since the offset must always be a multiple of 8,
2884 we use the least significant bit to record
2885 whether we have initialized it already.
2887 When doing a dynamic link, we create a .rela.got
2888 relocation entry to initialize the value. This
2889 is done in the finish_dynamic_symbol routine. */
2894 bfd_put_64 (output_bfd
, relocation
,
2895 base_got
->contents
+ off
);
2896 /* Note that this is harmless for the GOTPLT64
2897 case, as -1 | 1 still is -1. */
2903 relocation
= (base_got
->output_section
->vma
2904 + base_got
->output_offset
+ off
);
2906 if (r_type
!= R_X86_64_GOTPCREL
2907 && r_type
!= R_X86_64_GOTPCREL64
)
2910 if (htab
->elf
.splt
!= NULL
)
2911 gotplt
= htab
->elf
.sgotplt
;
2913 gotplt
= htab
->elf
.igotplt
;
2914 relocation
-= (gotplt
->output_section
->vma
2915 - gotplt
->output_offset
);
2922 /* When generating a shared object, the relocations handled here are
2923 copied into the output file to be resolved at run time. */
2926 case R_X86_64_GOT32
:
2927 case R_X86_64_GOT64
:
2928 /* Relocation is to the entry for this symbol in the global
2930 case R_X86_64_GOTPCREL
:
2931 case R_X86_64_GOTPCREL64
:
2932 /* Use global offset table entry as symbol value. */
2933 case R_X86_64_GOTPLT64
:
2934 /* This is the same as GOT64 for relocation purposes, but
2935 indicates the existence of a PLT entry. The difficulty is,
2936 that we must calculate the GOT slot offset from the PLT
2937 offset, if this symbol got a PLT entry (it was global).
2938 Additionally if it's computed from the PLT entry, then that
2939 GOT offset is relative to .got.plt, not to .got. */
2940 base_got
= htab
->elf
.sgot
;
2942 if (htab
->elf
.sgot
== NULL
)
2949 off
= h
->got
.offset
;
2951 && h
->plt
.offset
!= (bfd_vma
)-1
2952 && off
== (bfd_vma
)-1)
2954 /* We can't use h->got.offset here to save
2955 state, or even just remember the offset, as
2956 finish_dynamic_symbol would use that as offset into
2958 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2959 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2960 base_got
= htab
->elf
.sgotplt
;
2963 dyn
= htab
->elf
.dynamic_sections_created
;
2965 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
2967 && SYMBOL_REFERENCES_LOCAL (info
, h
))
2968 || (ELF_ST_VISIBILITY (h
->other
)
2969 && h
->root
.type
== bfd_link_hash_undefweak
))
2971 /* This is actually a static link, or it is a -Bsymbolic
2972 link and the symbol is defined locally, or the symbol
2973 was forced to be local because of a version file. We
2974 must initialize this entry in the global offset table.
2975 Since the offset must always be a multiple of 8, we
2976 use the least significant bit to record whether we
2977 have initialized it already.
2979 When doing a dynamic link, we create a .rela.got
2980 relocation entry to initialize the value. This is
2981 done in the finish_dynamic_symbol routine. */
2986 bfd_put_64 (output_bfd
, relocation
,
2987 base_got
->contents
+ off
);
2988 /* Note that this is harmless for the GOTPLT64 case,
2989 as -1 | 1 still is -1. */
2994 unresolved_reloc
= FALSE
;
2998 if (local_got_offsets
== NULL
)
3001 off
= local_got_offsets
[r_symndx
];
3003 /* The offset must always be a multiple of 8. We use
3004 the least significant bit to record whether we have
3005 already generated the necessary reloc. */
3010 bfd_put_64 (output_bfd
, relocation
,
3011 base_got
->contents
+ off
);
3016 Elf_Internal_Rela outrel
;
3018 /* We need to generate a R_X86_64_RELATIVE reloc
3019 for the dynamic linker. */
3020 s
= htab
->elf
.srelgot
;
3024 outrel
.r_offset
= (base_got
->output_section
->vma
3025 + base_got
->output_offset
3027 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3028 outrel
.r_addend
= relocation
;
3029 elf64_x86_64_append_rela (output_bfd
, s
, &outrel
);
3032 local_got_offsets
[r_symndx
] |= 1;
3036 if (off
>= (bfd_vma
) -2)
3039 relocation
= base_got
->output_section
->vma
3040 + base_got
->output_offset
+ off
;
3041 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3042 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3043 - htab
->elf
.sgotplt
->output_offset
;
3047 case R_X86_64_GOTOFF64
:
3048 /* Relocation is relative to the start of the global offset
3051 /* Check to make sure it isn't a protected function symbol
3052 for shared library since it may not be local when used
3053 as function address. */
3057 && h
->type
== STT_FUNC
3058 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3060 (*_bfd_error_handler
)
3061 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3062 input_bfd
, h
->root
.root
.string
);
3063 bfd_set_error (bfd_error_bad_value
);
3067 /* Note that sgot is not involved in this
3068 calculation. We always want the start of .got.plt. If we
3069 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3070 permitted by the ABI, we might have to change this
3072 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3073 + htab
->elf
.sgotplt
->output_offset
;
3076 case R_X86_64_GOTPC32
:
3077 case R_X86_64_GOTPC64
:
3078 /* Use global offset table as symbol value. */
3079 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3080 + htab
->elf
.sgotplt
->output_offset
;
3081 unresolved_reloc
= FALSE
;
3084 case R_X86_64_PLTOFF64
:
3085 /* Relocation is PLT entry relative to GOT. For local
3086 symbols it's the symbol itself relative to GOT. */
3088 /* See PLT32 handling. */
3089 && h
->plt
.offset
!= (bfd_vma
) -1
3090 && htab
->elf
.splt
!= NULL
)
3092 relocation
= (htab
->elf
.splt
->output_section
->vma
3093 + htab
->elf
.splt
->output_offset
3095 unresolved_reloc
= FALSE
;
3098 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3099 + htab
->elf
.sgotplt
->output_offset
;
3102 case R_X86_64_PLT32
:
3103 /* Relocation is to the entry for this symbol in the
3104 procedure linkage table. */
3106 /* Resolve a PLT32 reloc against a local symbol directly,
3107 without using the procedure linkage table. */
3111 if (h
->plt
.offset
== (bfd_vma
) -1
3112 || htab
->elf
.splt
== NULL
)
3114 /* We didn't make a PLT entry for this symbol. This
3115 happens when statically linking PIC code, or when
3116 using -Bsymbolic. */
3120 relocation
= (htab
->elf
.splt
->output_section
->vma
3121 + htab
->elf
.splt
->output_offset
3123 unresolved_reloc
= FALSE
;
3130 && (input_section
->flags
& SEC_ALLOC
) != 0
3131 && (input_section
->flags
& SEC_READONLY
) != 0
3134 bfd_boolean fail
= FALSE
;
3136 = (r_type
== R_X86_64_PC32
3137 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3139 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3141 /* Symbol is referenced locally. Make sure it is
3142 defined locally or for a branch. */
3143 fail
= !h
->def_regular
&& !branch
;
3147 /* Symbol isn't referenced locally. We only allow
3148 branch to symbol with non-default visibility. */
3150 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3157 const char *pic
= "";
3159 switch (ELF_ST_VISIBILITY (h
->other
))
3162 v
= _("hidden symbol");
3165 v
= _("internal symbol");
3168 v
= _("protected symbol");
3172 pic
= _("; recompile with -fPIC");
3177 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3179 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3181 (*_bfd_error_handler
) (fmt
, input_bfd
,
3182 x86_64_elf_howto_table
[r_type
].name
,
3183 v
, h
->root
.root
.string
, pic
);
3184 bfd_set_error (bfd_error_bad_value
);
3195 /* FIXME: The ABI says the linker should make sure the value is
3196 the same when it's zeroextended to 64 bit. */
3198 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3203 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3204 || h
->root
.type
!= bfd_link_hash_undefweak
)
3205 && (! IS_X86_64_PCREL_TYPE (r_type
)
3206 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3207 || (ELIMINATE_COPY_RELOCS
3214 || h
->root
.type
== bfd_link_hash_undefweak
3215 || h
->root
.type
== bfd_link_hash_undefined
)))
3217 Elf_Internal_Rela outrel
;
3218 bfd_boolean skip
, relocate
;
3221 /* When generating a shared object, these relocations
3222 are copied into the output file to be resolved at run
3228 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3230 if (outrel
.r_offset
== (bfd_vma
) -1)
3232 else if (outrel
.r_offset
== (bfd_vma
) -2)
3233 skip
= TRUE
, relocate
= TRUE
;
3235 outrel
.r_offset
+= (input_section
->output_section
->vma
3236 + input_section
->output_offset
);
3239 memset (&outrel
, 0, sizeof outrel
);
3241 /* h->dynindx may be -1 if this symbol was marked to
3245 && (IS_X86_64_PCREL_TYPE (r_type
)
3247 || ! SYMBOLIC_BIND (info
, h
)
3248 || ! h
->def_regular
))
3250 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
3251 outrel
.r_addend
= rel
->r_addend
;
3255 /* This symbol is local, or marked to become local. */
3256 if (r_type
== R_X86_64_64
)
3259 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3260 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3266 if (bfd_is_abs_section (sec
))
3268 else if (sec
== NULL
|| sec
->owner
== NULL
)
3270 bfd_set_error (bfd_error_bad_value
);
3277 /* We are turning this relocation into one
3278 against a section symbol. It would be
3279 proper to subtract the symbol's value,
3280 osec->vma, from the emitted reloc addend,
3281 but ld.so expects buggy relocs. */
3282 osec
= sec
->output_section
;
3283 sindx
= elf_section_data (osec
)->dynindx
;
3286 asection
*oi
= htab
->elf
.text_index_section
;
3287 sindx
= elf_section_data (oi
)->dynindx
;
3289 BFD_ASSERT (sindx
!= 0);
3292 outrel
.r_info
= ELF64_R_INFO (sindx
, r_type
);
3293 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3297 sreloc
= elf_section_data (input_section
)->sreloc
;
3299 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
3301 elf64_x86_64_append_rela (output_bfd
, sreloc
, &outrel
);
3303 /* If this reloc is against an external symbol, we do
3304 not want to fiddle with the addend. Otherwise, we
3305 need to include the symbol value so that it becomes
3306 an addend for the dynamic reloc. */
3313 case R_X86_64_TLSGD
:
3314 case R_X86_64_GOTPC32_TLSDESC
:
3315 case R_X86_64_TLSDESC_CALL
:
3316 case R_X86_64_GOTTPOFF
:
3317 tls_type
= GOT_UNKNOWN
;
3318 if (h
== NULL
&& local_got_offsets
)
3319 tls_type
= elf64_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3321 tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
3323 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3324 input_section
, contents
,
3325 symtab_hdr
, sym_hashes
,
3326 &r_type
, tls_type
, rel
,
3327 relend
, h
, r_symndx
))
3330 if (r_type
== R_X86_64_TPOFF32
)
3332 bfd_vma roff
= rel
->r_offset
;
3334 BFD_ASSERT (! unresolved_reloc
);
3336 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3338 /* GD->LE transition.
3339 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3340 .word 0x6666; rex64; call __tls_get_addr
3343 leaq foo@tpoff(%rax), %rax */
3344 memcpy (contents
+ roff
- 4,
3345 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3347 bfd_put_32 (output_bfd
,
3348 elf64_x86_64_tpoff (info
, relocation
),
3349 contents
+ roff
+ 8);
3350 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3354 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3356 /* GDesc -> LE transition.
3357 It's originally something like:
3358 leaq x@tlsdesc(%rip), %rax
3361 movl $x@tpoff, %rax. */
3363 unsigned int val
, type
;
3365 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3366 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3367 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3368 contents
+ roff
- 3);
3369 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3370 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3371 contents
+ roff
- 1);
3372 bfd_put_32 (output_bfd
,
3373 elf64_x86_64_tpoff (info
, relocation
),
3377 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3379 /* GDesc -> LE transition.
3384 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3385 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3388 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3390 /* IE->LE transition:
3391 Originally it can be one of:
3392 movq foo@gottpoff(%rip), %reg
3393 addq foo@gottpoff(%rip), %reg
3396 leaq foo(%reg), %reg
3399 unsigned int val
, type
, reg
;
3401 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3402 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3403 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3409 bfd_put_8 (output_bfd
, 0x49,
3410 contents
+ roff
- 3);
3411 bfd_put_8 (output_bfd
, 0xc7,
3412 contents
+ roff
- 2);
3413 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3414 contents
+ roff
- 1);
3418 /* addq -> addq - addressing with %rsp/%r12 is
3421 bfd_put_8 (output_bfd
, 0x49,
3422 contents
+ roff
- 3);
3423 bfd_put_8 (output_bfd
, 0x81,
3424 contents
+ roff
- 2);
3425 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3426 contents
+ roff
- 1);
3432 bfd_put_8 (output_bfd
, 0x4d,
3433 contents
+ roff
- 3);
3434 bfd_put_8 (output_bfd
, 0x8d,
3435 contents
+ roff
- 2);
3436 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3437 contents
+ roff
- 1);
3439 bfd_put_32 (output_bfd
,
3440 elf64_x86_64_tpoff (info
, relocation
),
3448 if (htab
->elf
.sgot
== NULL
)
3453 off
= h
->got
.offset
;
3454 offplt
= elf64_x86_64_hash_entry (h
)->tlsdesc_got
;
3458 if (local_got_offsets
== NULL
)
3461 off
= local_got_offsets
[r_symndx
];
3462 offplt
= local_tlsdesc_gotents
[r_symndx
];
3469 Elf_Internal_Rela outrel
;
3473 if (htab
->elf
.srelgot
== NULL
)
3476 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3478 if (GOT_TLS_GDESC_P (tls_type
))
3480 outrel
.r_info
= ELF64_R_INFO (indx
, R_X86_64_TLSDESC
);
3481 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3482 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3483 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3484 + htab
->elf
.sgotplt
->output_offset
3486 + htab
->sgotplt_jump_table_size
);
3487 sreloc
= htab
->elf
.srelplt
;
3489 outrel
.r_addend
= relocation
- elf64_x86_64_dtpoff_base (info
);
3491 outrel
.r_addend
= 0;
3492 elf64_x86_64_append_rela (output_bfd
, sreloc
, &outrel
);
3495 sreloc
= htab
->elf
.srelgot
;
3497 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3498 + htab
->elf
.sgot
->output_offset
+ off
);
3500 if (GOT_TLS_GD_P (tls_type
))
3501 dr_type
= R_X86_64_DTPMOD64
;
3502 else if (GOT_TLS_GDESC_P (tls_type
))
3505 dr_type
= R_X86_64_TPOFF64
;
3507 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3508 outrel
.r_addend
= 0;
3509 if ((dr_type
== R_X86_64_TPOFF64
3510 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3511 outrel
.r_addend
= relocation
- elf64_x86_64_dtpoff_base (info
);
3512 outrel
.r_info
= ELF64_R_INFO (indx
, dr_type
);
3514 elf64_x86_64_append_rela (output_bfd
, sreloc
, &outrel
);
3516 if (GOT_TLS_GD_P (tls_type
))
3520 BFD_ASSERT (! unresolved_reloc
);
3521 bfd_put_64 (output_bfd
,
3522 relocation
- elf64_x86_64_dtpoff_base (info
),
3523 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3527 bfd_put_64 (output_bfd
, 0,
3528 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3529 outrel
.r_info
= ELF64_R_INFO (indx
,
3531 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3532 elf64_x86_64_append_rela (output_bfd
, sreloc
,
3541 local_got_offsets
[r_symndx
] |= 1;
3544 if (off
>= (bfd_vma
) -2
3545 && ! GOT_TLS_GDESC_P (tls_type
))
3547 if (r_type
== ELF64_R_TYPE (rel
->r_info
))
3549 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3550 || r_type
== R_X86_64_TLSDESC_CALL
)
3551 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3552 + htab
->elf
.sgotplt
->output_offset
3553 + offplt
+ htab
->sgotplt_jump_table_size
;
3555 relocation
= htab
->elf
.sgot
->output_section
->vma
3556 + htab
->elf
.sgot
->output_offset
+ off
;
3557 unresolved_reloc
= FALSE
;
3561 bfd_vma roff
= rel
->r_offset
;
3563 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3565 /* GD->IE transition.
3566 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3567 .word 0x6666; rex64; call __tls_get_addr@plt
3570 addq foo@gottpoff(%rip), %rax */
3571 memcpy (contents
+ roff
- 4,
3572 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3575 relocation
= (htab
->elf
.sgot
->output_section
->vma
3576 + htab
->elf
.sgot
->output_offset
+ off
3578 - input_section
->output_section
->vma
3579 - input_section
->output_offset
3581 bfd_put_32 (output_bfd
, relocation
,
3582 contents
+ roff
+ 8);
3583 /* Skip R_X86_64_PLT32. */
3587 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3589 /* GDesc -> IE transition.
3590 It's originally something like:
3591 leaq x@tlsdesc(%rip), %rax
3594 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3596 /* Now modify the instruction as appropriate. To
3597 turn a leaq into a movq in the form we use it, it
3598 suffices to change the second byte from 0x8d to
3600 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3602 bfd_put_32 (output_bfd
,
3603 htab
->elf
.sgot
->output_section
->vma
3604 + htab
->elf
.sgot
->output_offset
+ off
3606 - input_section
->output_section
->vma
3607 - input_section
->output_offset
3612 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3614 /* GDesc -> IE transition.
3621 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3622 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3630 case R_X86_64_TLSLD
:
3631 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3632 input_section
, contents
,
3633 symtab_hdr
, sym_hashes
,
3634 &r_type
, GOT_UNKNOWN
,
3635 rel
, relend
, h
, r_symndx
))
3638 if (r_type
!= R_X86_64_TLSLD
)
3640 /* LD->LE transition:
3641 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3643 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3645 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3646 memcpy (contents
+ rel
->r_offset
- 3,
3647 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3648 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3653 if (htab
->elf
.sgot
== NULL
)
3656 off
= htab
->tls_ld_got
.offset
;
3661 Elf_Internal_Rela outrel
;
3663 if (htab
->elf
.srelgot
== NULL
)
3666 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3667 + htab
->elf
.sgot
->output_offset
+ off
);
3669 bfd_put_64 (output_bfd
, 0,
3670 htab
->elf
.sgot
->contents
+ off
);
3671 bfd_put_64 (output_bfd
, 0,
3672 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3673 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_DTPMOD64
);
3674 outrel
.r_addend
= 0;
3675 elf64_x86_64_append_rela (output_bfd
, htab
->elf
.srelgot
,
3677 htab
->tls_ld_got
.offset
|= 1;
3679 relocation
= htab
->elf
.sgot
->output_section
->vma
3680 + htab
->elf
.sgot
->output_offset
+ off
;
3681 unresolved_reloc
= FALSE
;
3684 case R_X86_64_DTPOFF32
:
3685 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
3686 relocation
-= elf64_x86_64_dtpoff_base (info
);
3688 relocation
= elf64_x86_64_tpoff (info
, relocation
);
3691 case R_X86_64_TPOFF32
:
3692 BFD_ASSERT (info
->executable
);
3693 relocation
= elf64_x86_64_tpoff (info
, relocation
);
3700 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3701 because such sections are not SEC_ALLOC and thus ld.so will
3702 not process them. */
3703 if (unresolved_reloc
3704 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3706 (*_bfd_error_handler
)
3707 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3710 (long) rel
->r_offset
,
3712 h
->root
.root
.string
);
3715 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3716 contents
, rel
->r_offset
,
3717 relocation
, rel
->r_addend
);
3719 if (r
!= bfd_reloc_ok
)
3724 name
= h
->root
.root
.string
;
3727 name
= bfd_elf_string_from_elf_section (input_bfd
,
3728 symtab_hdr
->sh_link
,
3733 name
= bfd_section_name (input_bfd
, sec
);
3736 if (r
== bfd_reloc_overflow
)
3738 if (! ((*info
->callbacks
->reloc_overflow
)
3739 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3740 (bfd_vma
) 0, input_bfd
, input_section
,
3746 (*_bfd_error_handler
)
3747 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3748 input_bfd
, input_section
,
3749 (long) rel
->r_offset
, name
, (int) r
);
3758 /* Finish up dynamic symbol handling. We set the contents of various
3759 dynamic sections here. */
3762 elf64_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3763 struct bfd_link_info
*info
,
3764 struct elf_link_hash_entry
*h
,
3765 Elf_Internal_Sym
*sym
)
3767 struct elf64_x86_64_link_hash_table
*htab
;
3769 htab
= elf64_x86_64_hash_table (info
);
3773 if (h
->plt
.offset
!= (bfd_vma
) -1)
3777 Elf_Internal_Rela rela
;
3779 asection
*plt
, *gotplt
, *relplt
;
3781 /* When building a static executable, use .iplt, .igot.plt and
3782 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3783 if (htab
->elf
.splt
!= NULL
)
3785 plt
= htab
->elf
.splt
;
3786 gotplt
= htab
->elf
.sgotplt
;
3787 relplt
= htab
->elf
.srelplt
;
3791 plt
= htab
->elf
.iplt
;
3792 gotplt
= htab
->elf
.igotplt
;
3793 relplt
= htab
->elf
.irelplt
;
3796 /* This symbol has an entry in the procedure linkage table. Set
3798 if ((h
->dynindx
== -1
3799 && !((h
->forced_local
|| info
->executable
)
3801 && h
->type
== STT_GNU_IFUNC
))
3807 /* Get the index in the procedure linkage table which
3808 corresponds to this symbol. This is the index of this symbol
3809 in all the symbols for which we are making plt entries. The
3810 first entry in the procedure linkage table is reserved.
3812 Get the offset into the .got table of the entry that
3813 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3814 bytes. The first three are reserved for the dynamic linker.
3816 For static executables, we don't reserve anything. */
3818 if (plt
== htab
->elf
.splt
)
3820 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3821 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3825 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3826 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
3829 /* Fill in the entry in the procedure linkage table. */
3830 memcpy (plt
->contents
+ h
->plt
.offset
, elf64_x86_64_plt_entry
,
3833 /* Insert the relocation positions of the plt section. The magic
3834 numbers at the end of the statements are the positions of the
3835 relocations in the plt section. */
3836 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3837 instruction uses 6 bytes, subtract this value. */
3838 bfd_put_32 (output_bfd
,
3839 (gotplt
->output_section
->vma
3840 + gotplt
->output_offset
3842 - plt
->output_section
->vma
3843 - plt
->output_offset
3846 plt
->contents
+ h
->plt
.offset
+ 2);
3848 /* Don't fill PLT entry for static executables. */
3849 if (plt
== htab
->elf
.splt
)
3851 /* Put relocation index. */
3852 bfd_put_32 (output_bfd
, plt_index
,
3853 plt
->contents
+ h
->plt
.offset
+ 7);
3854 /* Put offset for jmp .PLT0. */
3855 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3856 plt
->contents
+ h
->plt
.offset
+ 12);
3859 /* Fill in the entry in the global offset table, initially this
3860 points to the pushq instruction in the PLT which is at offset 6. */
3861 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
3862 + plt
->output_offset
3863 + h
->plt
.offset
+ 6),
3864 gotplt
->contents
+ got_offset
);
3866 /* Fill in the entry in the .rela.plt section. */
3867 rela
.r_offset
= (gotplt
->output_section
->vma
3868 + gotplt
->output_offset
3870 if (h
->dynindx
== -1
3871 || ((info
->executable
3872 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
3874 && h
->type
== STT_GNU_IFUNC
))
3876 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3877 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3878 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_IRELATIVE
);
3879 rela
.r_addend
= (h
->root
.u
.def
.value
3880 + h
->root
.u
.def
.section
->output_section
->vma
3881 + h
->root
.u
.def
.section
->output_offset
);
3885 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_JUMP_SLOT
);
3888 loc
= relplt
->contents
+ plt_index
* sizeof (Elf64_External_Rela
);
3889 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3891 if (!h
->def_regular
)
3893 /* Mark the symbol as undefined, rather than as defined in
3894 the .plt section. Leave the value if there were any
3895 relocations where pointer equality matters (this is a clue
3896 for the dynamic linker, to make function pointer
3897 comparisons work between an application and shared
3898 library), otherwise set it to zero. If a function is only
3899 called from a binary, there is no need to slow down
3900 shared libraries because of that. */
3901 sym
->st_shndx
= SHN_UNDEF
;
3902 if (!h
->pointer_equality_needed
)
3907 if (h
->got
.offset
!= (bfd_vma
) -1
3908 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h
)->tls_type
)
3909 && elf64_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
3911 Elf_Internal_Rela rela
;
3913 /* This symbol has an entry in the global offset table. Set it
3915 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
3918 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3919 + htab
->elf
.sgot
->output_offset
3920 + (h
->got
.offset
&~ (bfd_vma
) 1));
3922 /* If this is a static link, or it is a -Bsymbolic link and the
3923 symbol is defined locally or was forced to be local because
3924 of a version file, we just want to emit a RELATIVE reloc.
3925 The entry in the global offset table will already have been
3926 initialized in the relocate_section function. */
3928 && h
->type
== STT_GNU_IFUNC
)
3932 /* Generate R_X86_64_GLOB_DAT. */
3939 if (!h
->pointer_equality_needed
)
3942 /* For non-shared object, we can't use .got.plt, which
3943 contains the real function addres if we need pointer
3944 equality. We load the GOT entry with the PLT entry. */
3945 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
3946 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
3947 + plt
->output_offset
3949 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
3953 else if (info
->shared
3954 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3956 if (!h
->def_regular
)
3958 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3959 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3960 rela
.r_addend
= (h
->root
.u
.def
.value
3961 + h
->root
.u
.def
.section
->output_section
->vma
3962 + h
->root
.u
.def
.section
->output_offset
);
3966 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3968 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
3969 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
3970 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_GLOB_DAT
);
3974 elf64_x86_64_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
3979 Elf_Internal_Rela rela
;
3981 /* This symbol needs a copy reloc. Set it up. */
3983 if (h
->dynindx
== -1
3984 || (h
->root
.type
!= bfd_link_hash_defined
3985 && h
->root
.type
!= bfd_link_hash_defweak
)
3986 || htab
->srelbss
== NULL
)
3989 rela
.r_offset
= (h
->root
.u
.def
.value
3990 + h
->root
.u
.def
.section
->output_section
->vma
3991 + h
->root
.u
.def
.section
->output_offset
);
3992 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_COPY
);
3994 elf64_x86_64_append_rela (output_bfd
, htab
->srelbss
, &rela
);
3997 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
3998 be NULL for local symbols. */
4000 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4001 || h
== htab
->elf
.hgot
))
4002 sym
->st_shndx
= SHN_ABS
;
4007 /* Finish up local dynamic symbol handling. We set the contents of
4008 various dynamic sections here. */
4011 elf64_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4013 struct elf_link_hash_entry
*h
4014 = (struct elf_link_hash_entry
*) *slot
;
4015 struct bfd_link_info
*info
4016 = (struct bfd_link_info
*) inf
;
4018 return elf64_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4022 /* Used to decide how to sort relocs in an optimal manner for the
4023 dynamic linker, before writing them out. */
4025 static enum elf_reloc_type_class
4026 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4028 switch ((int) ELF64_R_TYPE (rela
->r_info
))
4030 case R_X86_64_RELATIVE
:
4031 return reloc_class_relative
;
4032 case R_X86_64_JUMP_SLOT
:
4033 return reloc_class_plt
;
4035 return reloc_class_copy
;
4037 return reloc_class_normal
;
4041 /* Finish up the dynamic sections. */
4044 elf64_x86_64_finish_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
4046 struct elf64_x86_64_link_hash_table
*htab
;
4050 htab
= elf64_x86_64_hash_table (info
);
4054 dynobj
= htab
->elf
.dynobj
;
4055 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4057 if (htab
->elf
.dynamic_sections_created
)
4059 Elf64_External_Dyn
*dyncon
, *dynconend
;
4061 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4064 dyncon
= (Elf64_External_Dyn
*) sdyn
->contents
;
4065 dynconend
= (Elf64_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
4066 for (; dyncon
< dynconend
; dyncon
++)
4068 Elf_Internal_Dyn dyn
;
4071 bfd_elf64_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4079 s
= htab
->elf
.sgotplt
;
4080 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4084 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4088 s
= htab
->elf
.srelplt
->output_section
;
4089 dyn
.d_un
.d_val
= s
->size
;
4093 /* The procedure linkage table relocs (DT_JMPREL) should
4094 not be included in the overall relocs (DT_RELA).
4095 Therefore, we override the DT_RELASZ entry here to
4096 make it not include the JMPREL relocs. Since the
4097 linker script arranges for .rela.plt to follow all
4098 other relocation sections, we don't have to worry
4099 about changing the DT_RELA entry. */
4100 if (htab
->elf
.srelplt
!= NULL
)
4102 s
= htab
->elf
.srelplt
->output_section
;
4103 dyn
.d_un
.d_val
-= s
->size
;
4107 case DT_TLSDESC_PLT
:
4109 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4110 + htab
->tlsdesc_plt
;
4113 case DT_TLSDESC_GOT
:
4115 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4116 + htab
->tlsdesc_got
;
4120 bfd_elf64_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4123 /* Fill in the special first entry in the procedure linkage table. */
4124 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4126 /* Fill in the first entry in the procedure linkage table. */
4127 memcpy (htab
->elf
.splt
->contents
, elf64_x86_64_plt0_entry
,
4129 /* Add offset for pushq GOT+8(%rip), since the instruction
4130 uses 6 bytes subtract this value. */
4131 bfd_put_32 (output_bfd
,
4132 (htab
->elf
.sgotplt
->output_section
->vma
4133 + htab
->elf
.sgotplt
->output_offset
4135 - htab
->elf
.splt
->output_section
->vma
4136 - htab
->elf
.splt
->output_offset
4138 htab
->elf
.splt
->contents
+ 2);
4139 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4140 the end of the instruction. */
4141 bfd_put_32 (output_bfd
,
4142 (htab
->elf
.sgotplt
->output_section
->vma
4143 + htab
->elf
.sgotplt
->output_offset
4145 - htab
->elf
.splt
->output_section
->vma
4146 - htab
->elf
.splt
->output_offset
4148 htab
->elf
.splt
->contents
+ 8);
4150 elf_section_data (htab
->elf
.splt
->output_section
)->this_hdr
.sh_entsize
=
4153 if (htab
->tlsdesc_plt
)
4155 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4156 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4158 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4159 elf64_x86_64_plt0_entry
,
4162 /* Add offset for pushq GOT+8(%rip), since the
4163 instruction uses 6 bytes subtract this value. */
4164 bfd_put_32 (output_bfd
,
4165 (htab
->elf
.sgotplt
->output_section
->vma
4166 + htab
->elf
.sgotplt
->output_offset
4168 - htab
->elf
.splt
->output_section
->vma
4169 - htab
->elf
.splt
->output_offset
4172 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4173 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4174 htab->tlsdesc_got. The 12 is the offset to the end of
4176 bfd_put_32 (output_bfd
,
4177 (htab
->elf
.sgot
->output_section
->vma
4178 + htab
->elf
.sgot
->output_offset
4180 - htab
->elf
.splt
->output_section
->vma
4181 - htab
->elf
.splt
->output_offset
4184 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4189 if (htab
->elf
.sgotplt
)
4191 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4193 (*_bfd_error_handler
)
4194 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4198 /* Fill in the first three entries in the global offset table. */
4199 if (htab
->elf
.sgotplt
->size
> 0)
4201 /* Set the first entry in the global offset table to the address of
4202 the dynamic section. */
4204 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4206 bfd_put_64 (output_bfd
,
4207 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4208 htab
->elf
.sgotplt
->contents
);
4209 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4210 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4211 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4214 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4218 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4219 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4222 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4223 htab_traverse (htab
->loc_hash_table
,
4224 elf64_x86_64_finish_local_dynamic_symbol
,
4230 /* Return address for Ith PLT stub in section PLT, for relocation REL
4231 or (bfd_vma) -1 if it should not be included. */
4234 elf64_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4235 const arelent
*rel ATTRIBUTE_UNUSED
)
4237 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4240 /* Handle an x86-64 specific section when reading an object file. This
4241 is called when elfcode.h finds a section with an unknown type. */
4244 elf64_x86_64_section_from_shdr (bfd
*abfd
,
4245 Elf_Internal_Shdr
*hdr
,
4249 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4252 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4258 /* Hook called by the linker routine which adds symbols from an object
4259 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4263 elf64_x86_64_add_symbol_hook (bfd
*abfd
,
4264 struct bfd_link_info
*info
,
4265 Elf_Internal_Sym
*sym
,
4266 const char **namep ATTRIBUTE_UNUSED
,
4267 flagword
*flagsp ATTRIBUTE_UNUSED
,
4273 switch (sym
->st_shndx
)
4275 case SHN_X86_64_LCOMMON
:
4276 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4279 lcomm
= bfd_make_section_with_flags (abfd
,
4283 | SEC_LINKER_CREATED
));
4286 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4289 *valp
= sym
->st_size
;
4293 if ((abfd
->flags
& DYNAMIC
) == 0
4294 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4295 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4301 /* Given a BFD section, try to locate the corresponding ELF section
4305 elf64_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4306 asection
*sec
, int *index_return
)
4308 if (sec
== &_bfd_elf_large_com_section
)
4310 *index_return
= SHN_X86_64_LCOMMON
;
4316 /* Process a symbol. */
4319 elf64_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4322 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4324 switch (elfsym
->internal_elf_sym
.st_shndx
)
4326 case SHN_X86_64_LCOMMON
:
4327 asym
->section
= &_bfd_elf_large_com_section
;
4328 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4329 /* Common symbol doesn't set BSF_GLOBAL. */
4330 asym
->flags
&= ~BSF_GLOBAL
;
4336 elf64_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4338 return (sym
->st_shndx
== SHN_COMMON
4339 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4343 elf64_x86_64_common_section_index (asection
*sec
)
4345 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4348 return SHN_X86_64_LCOMMON
;
4352 elf64_x86_64_common_section (asection
*sec
)
4354 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4355 return bfd_com_section_ptr
;
4357 return &_bfd_elf_large_com_section
;
4361 elf64_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4362 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4363 struct elf_link_hash_entry
*h
,
4364 Elf_Internal_Sym
*sym
,
4366 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4367 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4368 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4369 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4370 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4371 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4372 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4373 bfd_boolean
*newdyn
,
4374 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4375 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4376 bfd
*abfd ATTRIBUTE_UNUSED
,
4378 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4379 bfd_boolean
*olddyn
,
4380 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4381 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4385 /* A normal common symbol and a large common symbol result in a
4386 normal common symbol. We turn the large common symbol into a
4389 && h
->root
.type
== bfd_link_hash_common
4391 && bfd_is_com_section (*sec
)
4394 if (sym
->st_shndx
== SHN_COMMON
4395 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4397 h
->root
.u
.c
.p
->section
4398 = bfd_make_section_old_way (oldbfd
, "COMMON");
4399 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4401 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4402 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4403 *psec
= *sec
= bfd_com_section_ptr
;
4410 elf64_x86_64_additional_program_headers (bfd
*abfd
,
4411 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4416 /* Check to see if we need a large readonly segment. */
4417 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4418 if (s
&& (s
->flags
& SEC_LOAD
))
4421 /* Check to see if we need a large data segment. Since .lbss sections
4422 is placed right after the .bss section, there should be no need for
4423 a large data segment just because of .lbss. */
4424 s
= bfd_get_section_by_name (abfd
, ".ldata");
4425 if (s
&& (s
->flags
& SEC_LOAD
))
4431 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4434 elf64_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4436 if (h
->plt
.offset
!= (bfd_vma
) -1
4438 && !h
->pointer_equality_needed
)
4441 return _bfd_elf_hash_symbol (h
);
4444 static const struct bfd_elf_special_section
4445 elf64_x86_64_special_sections
[]=
4447 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4448 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4449 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4450 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4451 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4452 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4453 { NULL
, 0, 0, 0, 0 }
4456 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4457 #define TARGET_LITTLE_NAME "elf64-x86-64"
4458 #define ELF_ARCH bfd_arch_i386
4459 #define ELF_TARGET_ID X86_64_ELF_DATA
4460 #define ELF_MACHINE_CODE EM_X86_64
4461 #define ELF_MAXPAGESIZE 0x200000
4462 #define ELF_MINPAGESIZE 0x1000
4463 #define ELF_COMMONPAGESIZE 0x1000
4465 #define elf_backend_can_gc_sections 1
4466 #define elf_backend_can_refcount 1
4467 #define elf_backend_want_got_plt 1
4468 #define elf_backend_plt_readonly 1
4469 #define elf_backend_want_plt_sym 0
4470 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4471 #define elf_backend_rela_normal 1
4473 #define elf_info_to_howto elf64_x86_64_info_to_howto
4475 #define bfd_elf64_bfd_link_hash_table_create \
4476 elf64_x86_64_link_hash_table_create
4477 #define bfd_elf64_bfd_link_hash_table_free \
4478 elf64_x86_64_link_hash_table_free
4479 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
4480 #define bfd_elf64_bfd_reloc_name_lookup \
4481 elf64_x86_64_reloc_name_lookup
4483 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
4484 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4485 #define elf_backend_check_relocs elf64_x86_64_check_relocs
4486 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4487 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4488 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4489 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4490 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4491 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
4492 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4493 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
4494 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
4495 #define elf_backend_relocate_section elf64_x86_64_relocate_section
4496 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
4497 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
4498 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4499 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
4500 #define elf_backend_object_p elf64_x86_64_elf_object_p
4501 #define bfd_elf64_mkobject elf64_x86_64_mkobject
4503 #define elf_backend_section_from_shdr \
4504 elf64_x86_64_section_from_shdr
4506 #define elf_backend_section_from_bfd_section \
4507 elf64_x86_64_elf_section_from_bfd_section
4508 #define elf_backend_add_symbol_hook \
4509 elf64_x86_64_add_symbol_hook
4510 #define elf_backend_symbol_processing \
4511 elf64_x86_64_symbol_processing
4512 #define elf_backend_common_section_index \
4513 elf64_x86_64_common_section_index
4514 #define elf_backend_common_section \
4515 elf64_x86_64_common_section
4516 #define elf_backend_common_definition \
4517 elf64_x86_64_common_definition
4518 #define elf_backend_merge_symbol \
4519 elf64_x86_64_merge_symbol
4520 #define elf_backend_special_sections \
4521 elf64_x86_64_special_sections
4522 #define elf_backend_additional_program_headers \
4523 elf64_x86_64_additional_program_headers
4524 #define elf_backend_hash_symbol \
4525 elf64_x86_64_hash_symbol
4527 #undef elf_backend_post_process_headers
4528 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4530 #include "elf64-target.h"
4532 /* FreeBSD support. */
4534 #undef TARGET_LITTLE_SYM
4535 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4536 #undef TARGET_LITTLE_NAME
4537 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4540 #define ELF_OSABI ELFOSABI_FREEBSD
4543 #define elf64_bed elf64_x86_64_fbsd_bed
4545 #include "elf64-target.h"
4547 /* Solaris 2 support. */
4549 #undef TARGET_LITTLE_SYM
4550 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4551 #undef TARGET_LITTLE_NAME
4552 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4554 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4555 objects won't be recognized. */
4559 #define elf64_bed elf64_x86_64_sol2_bed
4561 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4563 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4565 #undef elf_backend_want_plt_sym
4566 #define elf_backend_want_plt_sym 1
4568 #include "elf64-target.h"
4570 /* Intel L1OM support. */
4573 elf64_l1om_elf_object_p (bfd
*abfd
)
4575 /* Set the right machine number for an L1OM elf64 file. */
4576 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
4580 #undef TARGET_LITTLE_SYM
4581 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4582 #undef TARGET_LITTLE_NAME
4583 #define TARGET_LITTLE_NAME "elf64-l1om"
4585 #define ELF_ARCH bfd_arch_l1om
4587 #undef ELF_MACHINE_CODE
4588 #define ELF_MACHINE_CODE EM_L1OM
4593 #define elf64_bed elf64_l1om_bed
4595 #undef elf_backend_object_p
4596 #define elf_backend_object_p elf64_l1om_elf_object_p
4598 #undef elf_backend_post_process_headers
4600 #include "elf64-target.h"
4602 /* FreeBSD L1OM support. */
4604 #undef TARGET_LITTLE_SYM
4605 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4606 #undef TARGET_LITTLE_NAME
4607 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4610 #define ELF_OSABI ELFOSABI_FREEBSD
4613 #define elf64_bed elf64_l1om_fbsd_bed
4615 #undef elf_backend_post_process_headers
4616 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4618 #include "elf64-target.h"