1 /* X86-64 specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 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_pid
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_program
336 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
337 elf_tdata (abfd
)->core_command
338 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
341 /* Note that for some reason, a spurious space is tacked
342 onto the end of the args in some (at least one anyway)
343 implementations, so strip it off if it exists. */
346 char *command
= elf_tdata (abfd
)->core_command
;
347 int n
= strlen (command
);
349 if (0 < n
&& command
[n
- 1] == ' ')
350 command
[n
- 1] = '\0';
356 /* Functions for the x86-64 ELF linker. */
358 /* The name of the dynamic interpreter. This is put in the .interp
361 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
363 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
364 copying dynamic variables from a shared lib into an app's dynbss
365 section, and instead use a dynamic relocation to point into the
367 #define ELIMINATE_COPY_RELOCS 1
369 /* The size in bytes of an entry in the global offset table. */
371 #define GOT_ENTRY_SIZE 8
373 /* The size in bytes of an entry in the procedure linkage table. */
375 #define PLT_ENTRY_SIZE 16
377 /* The first entry in a procedure linkage table looks like this. See the
378 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
380 static const bfd_byte elf64_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
382 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
383 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
384 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
387 /* Subsequent entries in a procedure linkage table look like this. */
389 static const bfd_byte elf64_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
391 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
392 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
393 0x68, /* pushq immediate */
394 0, 0, 0, 0, /* replaced with index into relocation table. */
395 0xe9, /* jmp relative */
396 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
399 /* x86-64 ELF linker hash entry. */
401 struct elf64_x86_64_link_hash_entry
403 struct elf_link_hash_entry elf
;
405 /* Track dynamic relocs copied for this symbol. */
406 struct elf_dyn_relocs
*dyn_relocs
;
408 #define GOT_UNKNOWN 0
412 #define GOT_TLS_GDESC 4
413 #define GOT_TLS_GD_BOTH_P(type) \
414 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
415 #define GOT_TLS_GD_P(type) \
416 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
417 #define GOT_TLS_GDESC_P(type) \
418 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
419 #define GOT_TLS_GD_ANY_P(type) \
420 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
421 unsigned char tls_type
;
423 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
424 starting at the end of the jump table. */
428 #define elf64_x86_64_hash_entry(ent) \
429 ((struct elf64_x86_64_link_hash_entry *)(ent))
431 struct elf64_x86_64_obj_tdata
433 struct elf_obj_tdata root
;
435 /* tls_type for each local got entry. */
436 char *local_got_tls_type
;
438 /* GOTPLT entries for TLS descriptors. */
439 bfd_vma
*local_tlsdesc_gotent
;
442 #define elf64_x86_64_tdata(abfd) \
443 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
445 #define elf64_x86_64_local_got_tls_type(abfd) \
446 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
448 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
449 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
451 #define is_x86_64_elf(bfd) \
452 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
453 && elf_tdata (bfd) != NULL \
454 && elf_object_id (bfd) == X86_64_ELF_TDATA)
457 elf64_x86_64_mkobject (bfd
*abfd
)
459 return bfd_elf_allocate_object (abfd
, sizeof (struct elf64_x86_64_obj_tdata
),
463 /* x86-64 ELF linker hash table. */
465 struct elf64_x86_64_link_hash_table
467 struct elf_link_hash_table elf
;
469 /* Short-cuts to get to dynamic linker sections. */
473 /* The offset into splt of the PLT entry for the TLS descriptor
474 resolver. Special values are 0, if not necessary (or not found
475 to be necessary yet), and -1 if needed but not determined
478 /* The offset into sgot of the GOT entry used by the PLT entry
483 bfd_signed_vma refcount
;
487 /* The amount of space used by the jump slots in the GOT. */
488 bfd_vma sgotplt_jump_table_size
;
490 /* Small local sym cache. */
491 struct sym_cache sym_cache
;
493 /* _TLS_MODULE_BASE_ symbol. */
494 struct bfd_link_hash_entry
*tls_module_base
;
496 /* Used by local STT_GNU_IFUNC symbols. */
497 htab_t loc_hash_table
;
498 void *loc_hash_memory
;
501 /* Get the x86-64 ELF linker hash table from a link_info structure. */
503 #define elf64_x86_64_hash_table(p) \
504 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
506 #define elf64_x86_64_compute_jump_table_size(htab) \
507 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
509 /* Create an entry in an x86-64 ELF linker hash table. */
511 static struct bfd_hash_entry
*
512 elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
513 struct bfd_hash_table
*table
,
516 /* Allocate the structure if it has not already been allocated by a
520 entry
= bfd_hash_allocate (table
,
521 sizeof (struct elf64_x86_64_link_hash_entry
));
526 /* Call the allocation method of the superclass. */
527 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
530 struct elf64_x86_64_link_hash_entry
*eh
;
532 eh
= (struct elf64_x86_64_link_hash_entry
*) entry
;
533 eh
->dyn_relocs
= NULL
;
534 eh
->tls_type
= GOT_UNKNOWN
;
535 eh
->tlsdesc_got
= (bfd_vma
) -1;
541 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
542 for local symbol so that we can handle local STT_GNU_IFUNC symbols
543 as global symbol. We reuse indx and dynstr_index for local symbol
544 hash since they aren't used by global symbols in this backend. */
547 elf64_x86_64_local_htab_hash (const void *ptr
)
549 struct elf_link_hash_entry
*h
550 = (struct elf_link_hash_entry
*) ptr
;
551 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
554 /* Compare local hash entries. */
557 elf64_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
559 struct elf_link_hash_entry
*h1
560 = (struct elf_link_hash_entry
*) ptr1
;
561 struct elf_link_hash_entry
*h2
562 = (struct elf_link_hash_entry
*) ptr2
;
564 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
567 /* Find and/or create a hash entry for local symbol. */
569 static struct elf_link_hash_entry
*
570 elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table
*htab
,
571 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
574 struct elf64_x86_64_link_hash_entry e
, *ret
;
575 asection
*sec
= abfd
->sections
;
576 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
577 ELF64_R_SYM (rel
->r_info
));
580 e
.elf
.indx
= sec
->id
;
581 e
.elf
.dynstr_index
= ELF64_R_SYM (rel
->r_info
);
582 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
583 create
? INSERT
: NO_INSERT
);
590 ret
= (struct elf64_x86_64_link_hash_entry
*) *slot
;
594 ret
= (struct elf64_x86_64_link_hash_entry
*)
595 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
596 sizeof (struct elf64_x86_64_link_hash_entry
));
599 memset (ret
, 0, sizeof (*ret
));
600 ret
->elf
.indx
= sec
->id
;
601 ret
->elf
.dynstr_index
= ELF64_R_SYM (rel
->r_info
);
602 ret
->elf
.dynindx
= -1;
603 ret
->elf
.plt
.offset
= (bfd_vma
) -1;
604 ret
->elf
.got
.offset
= (bfd_vma
) -1;
610 /* Create an X86-64 ELF linker hash table. */
612 static struct bfd_link_hash_table
*
613 elf64_x86_64_link_hash_table_create (bfd
*abfd
)
615 struct elf64_x86_64_link_hash_table
*ret
;
616 bfd_size_type amt
= sizeof (struct elf64_x86_64_link_hash_table
);
618 ret
= (struct elf64_x86_64_link_hash_table
*) bfd_malloc (amt
);
622 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
623 elf64_x86_64_link_hash_newfunc
,
624 sizeof (struct elf64_x86_64_link_hash_entry
)))
632 ret
->sym_cache
.abfd
= NULL
;
633 ret
->tlsdesc_plt
= 0;
634 ret
->tlsdesc_got
= 0;
635 ret
->tls_ld_got
.refcount
= 0;
636 ret
->sgotplt_jump_table_size
= 0;
637 ret
->tls_module_base
= NULL
;
639 ret
->loc_hash_table
= htab_try_create (1024,
640 elf64_x86_64_local_htab_hash
,
641 elf64_x86_64_local_htab_eq
,
643 ret
->loc_hash_memory
= objalloc_create ();
644 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
650 return &ret
->elf
.root
;
653 /* Destroy an X86-64 ELF linker hash table. */
656 elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table
*hash
)
658 struct elf64_x86_64_link_hash_table
*htab
659 = (struct elf64_x86_64_link_hash_table
*) hash
;
661 if (htab
->loc_hash_table
)
662 htab_delete (htab
->loc_hash_table
);
663 if (htab
->loc_hash_memory
)
664 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
665 _bfd_generic_link_hash_table_free (hash
);
668 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
669 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
673 elf64_x86_64_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
675 struct elf64_x86_64_link_hash_table
*htab
;
677 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
680 htab
= elf64_x86_64_hash_table (info
);
681 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
683 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
686 || (!info
->shared
&& !htab
->srelbss
))
692 /* Copy the extra info we tack onto an elf_link_hash_entry. */
695 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
696 struct elf_link_hash_entry
*dir
,
697 struct elf_link_hash_entry
*ind
)
699 struct elf64_x86_64_link_hash_entry
*edir
, *eind
;
701 edir
= (struct elf64_x86_64_link_hash_entry
*) dir
;
702 eind
= (struct elf64_x86_64_link_hash_entry
*) ind
;
704 if (eind
->dyn_relocs
!= NULL
)
706 if (edir
->dyn_relocs
!= NULL
)
708 struct elf_dyn_relocs
**pp
;
709 struct elf_dyn_relocs
*p
;
711 /* Add reloc counts against the indirect sym to the direct sym
712 list. Merge any entries against the same section. */
713 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
715 struct elf_dyn_relocs
*q
;
717 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
718 if (q
->sec
== p
->sec
)
720 q
->pc_count
+= p
->pc_count
;
721 q
->count
+= p
->count
;
728 *pp
= edir
->dyn_relocs
;
731 edir
->dyn_relocs
= eind
->dyn_relocs
;
732 eind
->dyn_relocs
= NULL
;
735 if (ind
->root
.type
== bfd_link_hash_indirect
736 && dir
->got
.refcount
<= 0)
738 edir
->tls_type
= eind
->tls_type
;
739 eind
->tls_type
= GOT_UNKNOWN
;
742 if (ELIMINATE_COPY_RELOCS
743 && ind
->root
.type
!= bfd_link_hash_indirect
744 && dir
->dynamic_adjusted
)
746 /* If called to transfer flags for a weakdef during processing
747 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
748 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
749 dir
->ref_dynamic
|= ind
->ref_dynamic
;
750 dir
->ref_regular
|= ind
->ref_regular
;
751 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
752 dir
->needs_plt
|= ind
->needs_plt
;
753 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
756 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
760 elf64_x86_64_elf_object_p (bfd
*abfd
)
762 /* Set the right machine number for an x86-64 elf64 file. */
763 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
781 /* Return TRUE if the TLS access code sequence support transition
785 elf64_x86_64_check_tls_transition (bfd
*abfd
, asection
*sec
,
787 Elf_Internal_Shdr
*symtab_hdr
,
788 struct elf_link_hash_entry
**sym_hashes
,
790 const Elf_Internal_Rela
*rel
,
791 const Elf_Internal_Rela
*relend
)
794 unsigned long r_symndx
;
795 struct elf_link_hash_entry
*h
;
798 /* Get the section contents. */
799 if (contents
== NULL
)
801 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
802 contents
= elf_section_data (sec
)->this_hdr
.contents
;
805 /* FIXME: How to better handle error condition? */
806 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
809 /* Cache the section contents for elf_link_input_bfd. */
810 elf_section_data (sec
)->this_hdr
.contents
= contents
;
814 offset
= rel
->r_offset
;
819 if ((rel
+ 1) >= relend
)
822 if (r_type
== R_X86_64_TLSGD
)
824 /* Check transition from GD access model. Only
825 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
826 .word 0x6666; rex64; call __tls_get_addr
827 can transit to different access model. */
829 static x86_64_opcode32 leaq
= { { 0x66, 0x48, 0x8d, 0x3d } },
830 call
= { { 0x66, 0x66, 0x48, 0xe8 } };
832 || (offset
+ 12) > sec
->size
833 || bfd_get_32 (abfd
, contents
+ offset
- 4) != leaq
.i
834 || bfd_get_32 (abfd
, contents
+ offset
+ 4) != call
.i
)
839 /* Check transition from LD access model. Only
840 leaq foo@tlsld(%rip), %rdi;
842 can transit to different access model. */
844 static x86_64_opcode32 ld
= { { 0x48, 0x8d, 0x3d, 0xe8 } };
847 if (offset
< 3 || (offset
+ 9) > sec
->size
)
850 op
.i
= bfd_get_32 (abfd
, contents
+ offset
- 3);
851 op
.c
[3] = bfd_get_8 (abfd
, contents
+ offset
+ 4);
856 r_symndx
= ELF64_R_SYM (rel
[1].r_info
);
857 if (r_symndx
< symtab_hdr
->sh_info
)
860 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
861 /* Use strncmp to check __tls_get_addr since __tls_get_addr
864 && h
->root
.root
.string
!= NULL
865 && (ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
866 || ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
867 && (strncmp (h
->root
.root
.string
,
868 "__tls_get_addr", 14) == 0));
870 case R_X86_64_GOTTPOFF
:
871 /* Check transition from IE access model:
872 movq foo@gottpoff(%rip), %reg
873 addq foo@gottpoff(%rip), %reg
876 if (offset
< 3 || (offset
+ 4) > sec
->size
)
879 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
880 if (val
!= 0x48 && val
!= 0x4c)
883 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
884 if (val
!= 0x8b && val
!= 0x03)
887 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
888 return (val
& 0xc7) == 5;
890 case R_X86_64_GOTPC32_TLSDESC
:
891 /* Check transition from GDesc access model:
892 leaq x@tlsdesc(%rip), %rax
894 Make sure it's a leaq adding rip to a 32-bit offset
895 into any register, although it's probably almost always
898 if (offset
< 3 || (offset
+ 4) > sec
->size
)
901 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
902 if ((val
& 0xfb) != 0x48)
905 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
908 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
909 return (val
& 0xc7) == 0x05;
911 case R_X86_64_TLSDESC_CALL
:
912 /* Check transition from GDesc access model:
913 call *x@tlsdesc(%rax)
915 if (offset
+ 2 <= sec
->size
)
917 /* Make sure that it's a call *x@tlsdesc(%rax). */
918 static x86_64_opcode16 call
= { { 0xff, 0x10 } };
919 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
929 /* Return TRUE if the TLS access transition is OK or no transition
930 will be performed. Update R_TYPE if there is a transition. */
933 elf64_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
934 asection
*sec
, bfd_byte
*contents
,
935 Elf_Internal_Shdr
*symtab_hdr
,
936 struct elf_link_hash_entry
**sym_hashes
,
937 unsigned int *r_type
, int tls_type
,
938 const Elf_Internal_Rela
*rel
,
939 const Elf_Internal_Rela
*relend
,
940 struct elf_link_hash_entry
*h
)
942 unsigned int from_type
= *r_type
;
943 unsigned int to_type
= from_type
;
944 bfd_boolean check
= TRUE
;
949 case R_X86_64_GOTPC32_TLSDESC
:
950 case R_X86_64_TLSDESC_CALL
:
951 case R_X86_64_GOTTPOFF
:
955 to_type
= R_X86_64_TPOFF32
;
957 to_type
= R_X86_64_GOTTPOFF
;
960 /* When we are called from elf64_x86_64_relocate_section,
961 CONTENTS isn't NULL and there may be additional transitions
962 based on TLS_TYPE. */
963 if (contents
!= NULL
)
965 unsigned int new_to_type
= to_type
;
970 && tls_type
== GOT_TLS_IE
)
971 new_to_type
= R_X86_64_TPOFF32
;
973 if (to_type
== R_X86_64_TLSGD
974 || to_type
== R_X86_64_GOTPC32_TLSDESC
975 || to_type
== R_X86_64_TLSDESC_CALL
)
977 if (tls_type
== GOT_TLS_IE
)
978 new_to_type
= R_X86_64_GOTTPOFF
;
981 /* We checked the transition before when we were called from
982 elf64_x86_64_check_relocs. We only want to check the new
983 transition which hasn't been checked before. */
984 check
= new_to_type
!= to_type
&& from_type
== to_type
;
985 to_type
= new_to_type
;
992 to_type
= R_X86_64_TPOFF32
;
999 /* Return TRUE if there is no transition. */
1000 if (from_type
== to_type
)
1003 /* Check if the transition can be performed. */
1005 && ! elf64_x86_64_check_tls_transition (abfd
, sec
, contents
,
1006 symtab_hdr
, sym_hashes
,
1007 from_type
, rel
, relend
))
1009 reloc_howto_type
*from
, *to
;
1011 from
= elf64_x86_64_rtype_to_howto (abfd
, from_type
);
1012 to
= elf64_x86_64_rtype_to_howto (abfd
, to_type
);
1014 (*_bfd_error_handler
)
1015 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1016 "in section `%A' failed"),
1017 abfd
, sec
, from
->name
, to
->name
,
1018 h
? h
->root
.root
.string
: "a local symbol",
1019 (unsigned long) rel
->r_offset
);
1020 bfd_set_error (bfd_error_bad_value
);
1028 /* Look through the relocs for a section during the first phase, and
1029 calculate needed space in the global offset table, procedure
1030 linkage table, and dynamic reloc sections. */
1033 elf64_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1035 const Elf_Internal_Rela
*relocs
)
1037 struct elf64_x86_64_link_hash_table
*htab
;
1038 Elf_Internal_Shdr
*symtab_hdr
;
1039 struct elf_link_hash_entry
**sym_hashes
;
1040 const Elf_Internal_Rela
*rel
;
1041 const Elf_Internal_Rela
*rel_end
;
1044 if (info
->relocatable
)
1047 BFD_ASSERT (is_x86_64_elf (abfd
));
1049 htab
= elf64_x86_64_hash_table (info
);
1050 symtab_hdr
= &elf_symtab_hdr (abfd
);
1051 sym_hashes
= elf_sym_hashes (abfd
);
1055 rel_end
= relocs
+ sec
->reloc_count
;
1056 for (rel
= relocs
; rel
< rel_end
; rel
++)
1058 unsigned int r_type
;
1059 unsigned long r_symndx
;
1060 struct elf_link_hash_entry
*h
;
1062 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1063 r_type
= ELF64_R_TYPE (rel
->r_info
);
1065 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1067 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1072 if (r_symndx
< symtab_hdr
->sh_info
)
1074 /* A local symbol. */
1075 Elf_Internal_Sym
*isym
;
1077 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1082 /* Check relocation against local STT_GNU_IFUNC symbol. */
1083 if (ELF64_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1085 h
= elf64_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1090 /* Fake a STT_GNU_IFUNC symbol. */
1091 h
->type
= STT_GNU_IFUNC
;
1094 h
->forced_local
= 1;
1095 h
->root
.type
= bfd_link_hash_defined
;
1102 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1103 while (h
->root
.type
== bfd_link_hash_indirect
1104 || h
->root
.type
== bfd_link_hash_warning
)
1105 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1110 /* Create the ifunc sections for static executables. If we
1111 never see an indirect function symbol nor we are building
1112 a static executable, those sections will be empty and
1113 won't appear in output. */
1124 case R_X86_64_PLT32
:
1125 case R_X86_64_GOTPCREL
:
1126 case R_X86_64_GOTPCREL64
:
1127 if (!_bfd_elf_create_ifunc_sections (abfd
, info
))
1132 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1133 it here if it is defined in a non-shared object. */
1134 if (h
->type
== STT_GNU_IFUNC
1137 /* It is referenced by a non-shared object. */
1140 /* STT_GNU_IFUNC symbol must go through PLT. */
1141 h
->plt
.refcount
+= 1;
1143 /* STT_GNU_IFUNC needs dynamic sections. */
1144 if (htab
->elf
.dynobj
== NULL
)
1145 htab
->elf
.dynobj
= abfd
;
1150 (*_bfd_error_handler
)
1151 (_("%B: relocation %s against STT_GNU_IFUNC "
1152 "symbol `%s' isn't handled by %s"), abfd
,
1153 x86_64_elf_howto_table
[r_type
].name
,
1154 (h
->root
.root
.string
1155 ? h
->root
.root
.string
: "a local symbol"),
1157 bfd_set_error (bfd_error_bad_value
);
1162 h
->pointer_equality_needed
= 1;
1165 /* We must copy these reloc types into the output
1166 file. Create a reloc section in dynobj and
1167 make room for this reloc. */
1168 sreloc
= _bfd_elf_create_ifunc_dyn_reloc
1169 (abfd
, info
, sec
, sreloc
,
1170 &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
);
1181 if (r_type
!= R_X86_64_PC32
1182 && r_type
!= R_X86_64_PC64
)
1183 h
->pointer_equality_needed
= 1;
1186 case R_X86_64_PLT32
:
1189 case R_X86_64_GOTPCREL
:
1190 case R_X86_64_GOTPCREL64
:
1191 h
->got
.refcount
+= 1;
1192 if (htab
->elf
.sgot
== NULL
1193 && !_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1203 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1204 symtab_hdr
, sym_hashes
,
1205 &r_type
, GOT_UNKNOWN
,
1211 case R_X86_64_TLSLD
:
1212 htab
->tls_ld_got
.refcount
+= 1;
1215 case R_X86_64_TPOFF32
:
1218 (*_bfd_error_handler
)
1219 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1221 x86_64_elf_howto_table
[r_type
].name
,
1222 (h
) ? h
->root
.root
.string
: "a local symbol");
1223 bfd_set_error (bfd_error_bad_value
);
1228 case R_X86_64_GOTTPOFF
:
1230 info
->flags
|= DF_STATIC_TLS
;
1233 case R_X86_64_GOT32
:
1234 case R_X86_64_GOTPCREL
:
1235 case R_X86_64_TLSGD
:
1236 case R_X86_64_GOT64
:
1237 case R_X86_64_GOTPCREL64
:
1238 case R_X86_64_GOTPLT64
:
1239 case R_X86_64_GOTPC32_TLSDESC
:
1240 case R_X86_64_TLSDESC_CALL
:
1241 /* This symbol requires a global offset table entry. */
1243 int tls_type
, old_tls_type
;
1247 default: tls_type
= GOT_NORMAL
; break;
1248 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1249 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1250 case R_X86_64_GOTPC32_TLSDESC
:
1251 case R_X86_64_TLSDESC_CALL
:
1252 tls_type
= GOT_TLS_GDESC
; break;
1257 if (r_type
== R_X86_64_GOTPLT64
)
1259 /* This relocation indicates that we also need
1260 a PLT entry, as this is a function. We don't need
1261 a PLT entry for local symbols. */
1263 h
->plt
.refcount
+= 1;
1265 h
->got
.refcount
+= 1;
1266 old_tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1270 bfd_signed_vma
*local_got_refcounts
;
1272 /* This is a global offset table entry for a local symbol. */
1273 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1274 if (local_got_refcounts
== NULL
)
1278 size
= symtab_hdr
->sh_info
;
1279 size
*= sizeof (bfd_signed_vma
)
1280 + sizeof (bfd_vma
) + sizeof (char);
1281 local_got_refcounts
= ((bfd_signed_vma
*)
1282 bfd_zalloc (abfd
, size
));
1283 if (local_got_refcounts
== NULL
)
1285 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1286 elf64_x86_64_local_tlsdesc_gotent (abfd
)
1287 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1288 elf64_x86_64_local_got_tls_type (abfd
)
1289 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1291 local_got_refcounts
[r_symndx
] += 1;
1293 = elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1296 /* If a TLS symbol is accessed using IE at least once,
1297 there is no point to use dynamic model for it. */
1298 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1299 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1300 || tls_type
!= GOT_TLS_IE
))
1302 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1303 tls_type
= old_tls_type
;
1304 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1305 && GOT_TLS_GD_ANY_P (tls_type
))
1306 tls_type
|= old_tls_type
;
1309 (*_bfd_error_handler
)
1310 (_("%B: '%s' accessed both as normal and thread local symbol"),
1311 abfd
, h
? h
->root
.root
.string
: "<local>");
1316 if (old_tls_type
!= tls_type
)
1319 elf64_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1321 elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1326 case R_X86_64_GOTOFF64
:
1327 case R_X86_64_GOTPC32
:
1328 case R_X86_64_GOTPC64
:
1330 if (htab
->elf
.sgot
== NULL
)
1332 if (htab
->elf
.dynobj
== NULL
)
1333 htab
->elf
.dynobj
= abfd
;
1334 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1340 case R_X86_64_PLT32
:
1341 /* This symbol requires a procedure linkage table entry. We
1342 actually build the entry in adjust_dynamic_symbol,
1343 because this might be a case of linking PIC code which is
1344 never referenced by a dynamic object, in which case we
1345 don't need to generate a procedure linkage table entry
1348 /* If this is a local symbol, we resolve it directly without
1349 creating a procedure linkage table entry. */
1354 h
->plt
.refcount
+= 1;
1357 case R_X86_64_PLTOFF64
:
1358 /* This tries to form the 'address' of a function relative
1359 to GOT. For global symbols we need a PLT entry. */
1363 h
->plt
.refcount
+= 1;
1371 /* Let's help debug shared library creation. These relocs
1372 cannot be used in shared libs. Don't error out for
1373 sections we don't care about, such as debug sections or
1374 non-constant sections. */
1376 && (sec
->flags
& SEC_ALLOC
) != 0
1377 && (sec
->flags
& SEC_READONLY
) != 0)
1379 (*_bfd_error_handler
)
1380 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1382 x86_64_elf_howto_table
[r_type
].name
,
1383 (h
) ? h
->root
.root
.string
: "a local symbol");
1384 bfd_set_error (bfd_error_bad_value
);
1394 if (h
!= NULL
&& info
->executable
)
1396 /* If this reloc is in a read-only section, we might
1397 need a copy reloc. We can't check reliably at this
1398 stage whether the section is read-only, as input
1399 sections have not yet been mapped to output sections.
1400 Tentatively set the flag for now, and correct in
1401 adjust_dynamic_symbol. */
1404 /* We may need a .plt entry if the function this reloc
1405 refers to is in a shared lib. */
1406 h
->plt
.refcount
+= 1;
1407 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1408 h
->pointer_equality_needed
= 1;
1411 /* If we are creating a shared library, and this is a reloc
1412 against a global symbol, or a non PC relative reloc
1413 against a local symbol, then we need to copy the reloc
1414 into the shared library. However, if we are linking with
1415 -Bsymbolic, we do not need to copy a reloc against a
1416 global symbol which is defined in an object we are
1417 including in the link (i.e., DEF_REGULAR is set). At
1418 this point we have not seen all the input files, so it is
1419 possible that DEF_REGULAR is not set now but will be set
1420 later (it is never cleared). In case of a weak definition,
1421 DEF_REGULAR may be cleared later by a strong definition in
1422 a shared library. We account for that possibility below by
1423 storing information in the relocs_copied field of the hash
1424 table entry. A similar situation occurs when creating
1425 shared libraries and symbol visibility changes render the
1428 If on the other hand, we are creating an executable, we
1429 may need to keep relocations for symbols satisfied by a
1430 dynamic library if we manage to avoid copy relocs for the
1433 && (sec
->flags
& SEC_ALLOC
) != 0
1434 && (! IS_X86_64_PCREL_TYPE (r_type
)
1436 && (! SYMBOLIC_BIND (info
, h
)
1437 || h
->root
.type
== bfd_link_hash_defweak
1438 || !h
->def_regular
))))
1439 || (ELIMINATE_COPY_RELOCS
1441 && (sec
->flags
& SEC_ALLOC
) != 0
1443 && (h
->root
.type
== bfd_link_hash_defweak
1444 || !h
->def_regular
)))
1446 struct elf_dyn_relocs
*p
;
1447 struct elf_dyn_relocs
**head
;
1449 /* We must copy these reloc types into the output file.
1450 Create a reloc section in dynobj and make room for
1454 if (htab
->elf
.dynobj
== NULL
)
1455 htab
->elf
.dynobj
= abfd
;
1457 sreloc
= _bfd_elf_make_dynamic_reloc_section
1458 (sec
, htab
->elf
.dynobj
, 3, abfd
, /*rela?*/ TRUE
);
1464 /* If this is a global symbol, we count the number of
1465 relocations we need for this symbol. */
1468 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1472 /* Track dynamic relocs needed for local syms too.
1473 We really need local syms available to do this
1477 Elf_Internal_Sym
*isym
;
1479 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1484 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1488 /* Beware of type punned pointers vs strict aliasing
1490 vpp
= &(elf_section_data (s
)->local_dynrel
);
1491 head
= (struct elf_dyn_relocs
**)vpp
;
1495 if (p
== NULL
|| p
->sec
!= sec
)
1497 bfd_size_type amt
= sizeof *p
;
1499 p
= ((struct elf_dyn_relocs
*)
1500 bfd_alloc (htab
->elf
.dynobj
, amt
));
1511 if (IS_X86_64_PCREL_TYPE (r_type
))
1516 /* This relocation describes the C++ object vtable hierarchy.
1517 Reconstruct it for later use during GC. */
1518 case R_X86_64_GNU_VTINHERIT
:
1519 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1523 /* This relocation describes which C++ vtable entries are actually
1524 used. Record for later use during GC. */
1525 case R_X86_64_GNU_VTENTRY
:
1526 BFD_ASSERT (h
!= NULL
);
1528 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1540 /* Return the section that should be marked against GC for a given
1544 elf64_x86_64_gc_mark_hook (asection
*sec
,
1545 struct bfd_link_info
*info
,
1546 Elf_Internal_Rela
*rel
,
1547 struct elf_link_hash_entry
*h
,
1548 Elf_Internal_Sym
*sym
)
1551 switch (ELF64_R_TYPE (rel
->r_info
))
1553 case R_X86_64_GNU_VTINHERIT
:
1554 case R_X86_64_GNU_VTENTRY
:
1558 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1561 /* Update the got entry reference counts for the section being removed. */
1564 elf64_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1566 const Elf_Internal_Rela
*relocs
)
1568 Elf_Internal_Shdr
*symtab_hdr
;
1569 struct elf_link_hash_entry
**sym_hashes
;
1570 bfd_signed_vma
*local_got_refcounts
;
1571 const Elf_Internal_Rela
*rel
, *relend
;
1573 if (info
->relocatable
)
1576 elf_section_data (sec
)->local_dynrel
= NULL
;
1578 symtab_hdr
= &elf_symtab_hdr (abfd
);
1579 sym_hashes
= elf_sym_hashes (abfd
);
1580 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1582 relend
= relocs
+ sec
->reloc_count
;
1583 for (rel
= relocs
; rel
< relend
; rel
++)
1585 unsigned long r_symndx
;
1586 unsigned int r_type
;
1587 struct elf_link_hash_entry
*h
= NULL
;
1589 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1590 if (r_symndx
>= symtab_hdr
->sh_info
)
1592 struct elf64_x86_64_link_hash_entry
*eh
;
1593 struct elf_dyn_relocs
**pp
;
1594 struct elf_dyn_relocs
*p
;
1596 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1597 while (h
->root
.type
== bfd_link_hash_indirect
1598 || h
->root
.type
== bfd_link_hash_warning
)
1599 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1600 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1602 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1605 /* Everything must go for SEC. */
1611 r_type
= ELF64_R_TYPE (rel
->r_info
);
1612 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1613 symtab_hdr
, sym_hashes
,
1614 &r_type
, GOT_UNKNOWN
,
1620 case R_X86_64_TLSLD
:
1621 if (elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
> 0)
1622 elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
-= 1;
1625 case R_X86_64_TLSGD
:
1626 case R_X86_64_GOTPC32_TLSDESC
:
1627 case R_X86_64_TLSDESC_CALL
:
1628 case R_X86_64_GOTTPOFF
:
1629 case R_X86_64_GOT32
:
1630 case R_X86_64_GOTPCREL
:
1631 case R_X86_64_GOT64
:
1632 case R_X86_64_GOTPCREL64
:
1633 case R_X86_64_GOTPLT64
:
1636 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1637 h
->plt
.refcount
-= 1;
1638 if (h
->got
.refcount
> 0)
1639 h
->got
.refcount
-= 1;
1641 else if (local_got_refcounts
!= NULL
)
1643 if (local_got_refcounts
[r_symndx
] > 0)
1644 local_got_refcounts
[r_symndx
] -= 1;
1661 case R_X86_64_PLT32
:
1662 case R_X86_64_PLTOFF64
:
1665 if (h
->plt
.refcount
> 0)
1666 h
->plt
.refcount
-= 1;
1678 /* Adjust a symbol defined by a dynamic object and referenced by a
1679 regular object. The current definition is in some section of the
1680 dynamic object, but we're not including those sections. We have to
1681 change the definition to something the rest of the link can
1685 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1686 struct elf_link_hash_entry
*h
)
1688 struct elf64_x86_64_link_hash_table
*htab
;
1691 /* STT_GNU_IFUNC symbol must go through PLT. */
1692 if (h
->type
== STT_GNU_IFUNC
)
1694 if (h
->plt
.refcount
<= 0)
1696 h
->plt
.offset
= (bfd_vma
) -1;
1702 /* If this is a function, put it in the procedure linkage table. We
1703 will fill in the contents of the procedure linkage table later,
1704 when we know the address of the .got section. */
1705 if (h
->type
== STT_FUNC
1708 if (h
->plt
.refcount
<= 0
1709 || SYMBOL_CALLS_LOCAL (info
, h
)
1710 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1711 && h
->root
.type
== bfd_link_hash_undefweak
))
1713 /* This case can occur if we saw a PLT32 reloc in an input
1714 file, but the symbol was never referred to by a dynamic
1715 object, or if all references were garbage collected. In
1716 such a case, we don't actually need to build a procedure
1717 linkage table, and we can just do a PC32 reloc instead. */
1718 h
->plt
.offset
= (bfd_vma
) -1;
1725 /* It's possible that we incorrectly decided a .plt reloc was
1726 needed for an R_X86_64_PC32 reloc to a non-function sym in
1727 check_relocs. We can't decide accurately between function and
1728 non-function syms in check-relocs; Objects loaded later in
1729 the link may change h->type. So fix it now. */
1730 h
->plt
.offset
= (bfd_vma
) -1;
1732 /* If this is a weak symbol, and there is a real definition, the
1733 processor independent code will have arranged for us to see the
1734 real definition first, and we can just use the same value. */
1735 if (h
->u
.weakdef
!= NULL
)
1737 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1738 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1739 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1740 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1741 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1742 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1746 /* This is a reference to a symbol defined by a dynamic object which
1747 is not a function. */
1749 /* If we are creating a shared library, we must presume that the
1750 only references to the symbol are via the global offset table.
1751 For such cases we need not do anything here; the relocations will
1752 be handled correctly by relocate_section. */
1756 /* If there are no references to this symbol that do not use the
1757 GOT, we don't need to generate a copy reloc. */
1758 if (!h
->non_got_ref
)
1761 /* If -z nocopyreloc was given, we won't generate them either. */
1762 if (info
->nocopyreloc
)
1768 if (ELIMINATE_COPY_RELOCS
)
1770 struct elf64_x86_64_link_hash_entry
* eh
;
1771 struct elf_dyn_relocs
*p
;
1773 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1774 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1776 s
= p
->sec
->output_section
;
1777 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1781 /* If we didn't find any dynamic relocs in read-only sections, then
1782 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1792 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1793 h
->root
.root
.string
);
1797 /* We must allocate the symbol in our .dynbss section, which will
1798 become part of the .bss section of the executable. There will be
1799 an entry for this symbol in the .dynsym section. The dynamic
1800 object will contain position independent code, so all references
1801 from the dynamic object to this symbol will go through the global
1802 offset table. The dynamic linker will use the .dynsym entry to
1803 determine the address it must put in the global offset table, so
1804 both the dynamic object and the regular object will refer to the
1805 same memory location for the variable. */
1807 htab
= elf64_x86_64_hash_table (info
);
1809 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1810 to copy the initial value out of the dynamic object and into the
1811 runtime process image. */
1812 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1814 htab
->srelbss
->size
+= sizeof (Elf64_External_Rela
);
1820 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1823 /* Allocate space in .plt, .got and associated reloc sections for
1827 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1829 struct bfd_link_info
*info
;
1830 struct elf64_x86_64_link_hash_table
*htab
;
1831 struct elf64_x86_64_link_hash_entry
*eh
;
1832 struct elf_dyn_relocs
*p
;
1834 if (h
->root
.type
== bfd_link_hash_indirect
)
1837 if (h
->root
.type
== bfd_link_hash_warning
)
1838 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1839 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1841 info
= (struct bfd_link_info
*) inf
;
1842 htab
= elf64_x86_64_hash_table (info
);
1844 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1845 here if it is defined and referenced in a non-shared object. */
1846 if (h
->type
== STT_GNU_IFUNC
1848 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
1852 else if (htab
->elf
.dynamic_sections_created
1853 && h
->plt
.refcount
> 0)
1855 /* Make sure this symbol is output as a dynamic symbol.
1856 Undefined weak syms won't yet be marked as dynamic. */
1857 if (h
->dynindx
== -1
1858 && !h
->forced_local
)
1860 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1865 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1867 asection
*s
= htab
->elf
.splt
;
1869 /* If this is the first .plt entry, make room for the special
1872 s
->size
+= PLT_ENTRY_SIZE
;
1874 h
->plt
.offset
= s
->size
;
1876 /* If this symbol is not defined in a regular file, and we are
1877 not generating a shared library, then set the symbol to this
1878 location in the .plt. This is required to make function
1879 pointers compare as equal between the normal executable and
1880 the shared library. */
1884 h
->root
.u
.def
.section
= s
;
1885 h
->root
.u
.def
.value
= h
->plt
.offset
;
1888 /* Make room for this entry. */
1889 s
->size
+= PLT_ENTRY_SIZE
;
1891 /* We also need to make an entry in the .got.plt section, which
1892 will be placed in the .got section by the linker script. */
1893 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
1895 /* We also need to make an entry in the .rela.plt section. */
1896 htab
->elf
.srelplt
->size
+= sizeof (Elf64_External_Rela
);
1897 htab
->elf
.srelplt
->reloc_count
++;
1901 h
->plt
.offset
= (bfd_vma
) -1;
1907 h
->plt
.offset
= (bfd_vma
) -1;
1911 eh
->tlsdesc_got
= (bfd_vma
) -1;
1913 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1914 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1915 if (h
->got
.refcount
> 0
1918 && elf64_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
1920 h
->got
.offset
= (bfd_vma
) -1;
1922 else if (h
->got
.refcount
> 0)
1926 int tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1928 /* Make sure this symbol is output as a dynamic symbol.
1929 Undefined weak syms won't yet be marked as dynamic. */
1930 if (h
->dynindx
== -1
1931 && !h
->forced_local
)
1933 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1937 if (GOT_TLS_GDESC_P (tls_type
))
1939 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
1940 - elf64_x86_64_compute_jump_table_size (htab
);
1941 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
1942 h
->got
.offset
= (bfd_vma
) -2;
1944 if (! GOT_TLS_GDESC_P (tls_type
)
1945 || GOT_TLS_GD_P (tls_type
))
1948 h
->got
.offset
= s
->size
;
1949 s
->size
+= GOT_ENTRY_SIZE
;
1950 if (GOT_TLS_GD_P (tls_type
))
1951 s
->size
+= GOT_ENTRY_SIZE
;
1953 dyn
= htab
->elf
.dynamic_sections_created
;
1954 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1956 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1957 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
1958 || tls_type
== GOT_TLS_IE
)
1959 htab
->elf
.srelgot
->size
+= sizeof (Elf64_External_Rela
);
1960 else if (GOT_TLS_GD_P (tls_type
))
1961 htab
->elf
.srelgot
->size
+= 2 * sizeof (Elf64_External_Rela
);
1962 else if (! GOT_TLS_GDESC_P (tls_type
)
1963 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1964 || h
->root
.type
!= bfd_link_hash_undefweak
)
1966 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
1967 htab
->elf
.srelgot
->size
+= sizeof (Elf64_External_Rela
);
1968 if (GOT_TLS_GDESC_P (tls_type
))
1970 htab
->elf
.srelplt
->size
+= sizeof (Elf64_External_Rela
);
1971 htab
->tlsdesc_plt
= (bfd_vma
) -1;
1975 h
->got
.offset
= (bfd_vma
) -1;
1977 if (eh
->dyn_relocs
== NULL
)
1980 /* In the shared -Bsymbolic case, discard space allocated for
1981 dynamic pc-relative relocs against symbols which turn out to be
1982 defined in regular objects. For the normal shared case, discard
1983 space for pc-relative relocs that have become local due to symbol
1984 visibility changes. */
1988 /* Relocs that use pc_count are those that appear on a call
1989 insn, or certain REL relocs that can generated via assembly.
1990 We want calls to protected symbols to resolve directly to the
1991 function rather than going via the plt. If people want
1992 function pointer comparisons to work as expected then they
1993 should avoid writing weird assembly. */
1994 if (SYMBOL_CALLS_LOCAL (info
, h
))
1996 struct elf_dyn_relocs
**pp
;
1998 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2000 p
->count
-= p
->pc_count
;
2009 /* Also discard relocs on undefined weak syms with non-default
2011 if (eh
->dyn_relocs
!= NULL
2012 && h
->root
.type
== bfd_link_hash_undefweak
)
2014 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2015 eh
->dyn_relocs
= NULL
;
2017 /* Make sure undefined weak symbols are output as a dynamic
2019 else if (h
->dynindx
== -1
2020 && ! h
->forced_local
2021 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2026 else if (ELIMINATE_COPY_RELOCS
)
2028 /* For the non-shared case, discard space for relocs against
2029 symbols which turn out to need copy relocs or are not
2035 || (htab
->elf
.dynamic_sections_created
2036 && (h
->root
.type
== bfd_link_hash_undefweak
2037 || h
->root
.type
== bfd_link_hash_undefined
))))
2039 /* Make sure this symbol is output as a dynamic symbol.
2040 Undefined weak syms won't yet be marked as dynamic. */
2041 if (h
->dynindx
== -1
2042 && ! h
->forced_local
2043 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2046 /* If that succeeded, we know we'll be keeping all the
2048 if (h
->dynindx
!= -1)
2052 eh
->dyn_relocs
= NULL
;
2057 /* Finally, allocate space. */
2058 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2062 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2064 BFD_ASSERT (sreloc
!= NULL
);
2066 sreloc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2072 /* Allocate space in .plt, .got and associated reloc sections for
2073 local dynamic relocs. */
2076 elf64_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2078 struct elf_link_hash_entry
*h
2079 = (struct elf_link_hash_entry
*) *slot
;
2081 if (h
->type
!= STT_GNU_IFUNC
2085 || h
->root
.type
!= bfd_link_hash_defined
)
2088 return elf64_x86_64_allocate_dynrelocs (h
, inf
);
2091 /* Find any dynamic relocs that apply to read-only sections. */
2094 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2096 struct elf64_x86_64_link_hash_entry
*eh
;
2097 struct elf_dyn_relocs
*p
;
2099 if (h
->root
.type
== bfd_link_hash_warning
)
2100 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2102 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
2103 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2105 asection
*s
= p
->sec
->output_section
;
2107 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2109 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2111 info
->flags
|= DF_TEXTREL
;
2113 /* Not an error, just cut short the traversal. */
2120 /* Set the sizes of the dynamic sections. */
2123 elf64_x86_64_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2124 struct bfd_link_info
*info
)
2126 struct elf64_x86_64_link_hash_table
*htab
;
2132 htab
= elf64_x86_64_hash_table (info
);
2133 dynobj
= htab
->elf
.dynobj
;
2137 if (htab
->elf
.dynamic_sections_created
)
2139 /* Set the contents of the .interp section to the interpreter. */
2140 if (info
->executable
)
2142 s
= bfd_get_section_by_name (dynobj
, ".interp");
2145 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
2146 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
2150 /* Set up .got offsets for local syms, and space for local dynamic
2152 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2154 bfd_signed_vma
*local_got
;
2155 bfd_signed_vma
*end_local_got
;
2156 char *local_tls_type
;
2157 bfd_vma
*local_tlsdesc_gotent
;
2158 bfd_size_type locsymcount
;
2159 Elf_Internal_Shdr
*symtab_hdr
;
2162 if (! is_x86_64_elf (ibfd
))
2165 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2167 struct elf_dyn_relocs
*p
;
2169 for (p
= (struct elf_dyn_relocs
*)
2170 (elf_section_data (s
)->local_dynrel
);
2174 if (!bfd_is_abs_section (p
->sec
)
2175 && bfd_is_abs_section (p
->sec
->output_section
))
2177 /* Input section has been discarded, either because
2178 it is a copy of a linkonce section or due to
2179 linker script /DISCARD/, so we'll be discarding
2182 else if (p
->count
!= 0)
2184 srel
= elf_section_data (p
->sec
)->sreloc
;
2185 srel
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2186 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2187 info
->flags
|= DF_TEXTREL
;
2192 local_got
= elf_local_got_refcounts (ibfd
);
2196 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2197 locsymcount
= symtab_hdr
->sh_info
;
2198 end_local_got
= local_got
+ locsymcount
;
2199 local_tls_type
= elf64_x86_64_local_got_tls_type (ibfd
);
2200 local_tlsdesc_gotent
= elf64_x86_64_local_tlsdesc_gotent (ibfd
);
2202 srel
= htab
->elf
.srelgot
;
2203 for (; local_got
< end_local_got
;
2204 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2206 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2209 if (GOT_TLS_GDESC_P (*local_tls_type
))
2211 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2212 - elf64_x86_64_compute_jump_table_size (htab
);
2213 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2214 *local_got
= (bfd_vma
) -2;
2216 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2217 || GOT_TLS_GD_P (*local_tls_type
))
2219 *local_got
= s
->size
;
2220 s
->size
+= GOT_ENTRY_SIZE
;
2221 if (GOT_TLS_GD_P (*local_tls_type
))
2222 s
->size
+= GOT_ENTRY_SIZE
;
2225 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2226 || *local_tls_type
== GOT_TLS_IE
)
2228 if (GOT_TLS_GDESC_P (*local_tls_type
))
2230 htab
->elf
.srelplt
->size
2231 += sizeof (Elf64_External_Rela
);
2232 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2234 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2235 || GOT_TLS_GD_P (*local_tls_type
))
2236 srel
->size
+= sizeof (Elf64_External_Rela
);
2240 *local_got
= (bfd_vma
) -1;
2244 if (htab
->tls_ld_got
.refcount
> 0)
2246 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2248 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2249 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2250 htab
->elf
.srelgot
->size
+= sizeof (Elf64_External_Rela
);
2253 htab
->tls_ld_got
.offset
= -1;
2255 /* Allocate global sym .plt and .got entries, and space for global
2256 sym dynamic relocs. */
2257 elf_link_hash_traverse (&htab
->elf
, elf64_x86_64_allocate_dynrelocs
,
2260 /* Allocate .plt and .got entries, and space for local symbols. */
2261 htab_traverse (htab
->loc_hash_table
,
2262 elf64_x86_64_allocate_local_dynrelocs
,
2265 /* For every jump slot reserved in the sgotplt, reloc_count is
2266 incremented. However, when we reserve space for TLS descriptors,
2267 it's not incremented, so in order to compute the space reserved
2268 for them, it suffices to multiply the reloc count by the jump
2270 if (htab
->elf
.srelplt
)
2271 htab
->sgotplt_jump_table_size
2272 = elf64_x86_64_compute_jump_table_size (htab
);
2274 if (htab
->tlsdesc_plt
)
2276 /* If we're not using lazy TLS relocations, don't generate the
2277 PLT and GOT entries they require. */
2278 if ((info
->flags
& DF_BIND_NOW
))
2279 htab
->tlsdesc_plt
= 0;
2282 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2283 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2284 /* Reserve room for the initial entry.
2285 FIXME: we could probably do away with it in this case. */
2286 if (htab
->elf
.splt
->size
== 0)
2287 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2288 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2289 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2293 /* We now have determined the sizes of the various dynamic sections.
2294 Allocate memory for them. */
2296 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2298 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2301 if (s
== htab
->elf
.splt
2302 || s
== htab
->elf
.sgot
2303 || s
== htab
->elf
.sgotplt
2304 || s
== htab
->elf
.iplt
2305 || s
== htab
->elf
.igotplt
2306 || s
== htab
->sdynbss
)
2308 /* Strip this section if we don't need it; see the
2311 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2313 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2316 /* We use the reloc_count field as a counter if we need
2317 to copy relocs into the output file. */
2318 if (s
!= htab
->elf
.srelplt
)
2323 /* It's not one of our sections, so don't allocate space. */
2329 /* If we don't need this section, strip it from the
2330 output file. This is mostly to handle .rela.bss and
2331 .rela.plt. We must create both sections in
2332 create_dynamic_sections, because they must be created
2333 before the linker maps input sections to output
2334 sections. The linker does that before
2335 adjust_dynamic_symbol is called, and it is that
2336 function which decides whether anything needs to go
2337 into these sections. */
2339 s
->flags
|= SEC_EXCLUDE
;
2343 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2346 /* Allocate memory for the section contents. We use bfd_zalloc
2347 here in case unused entries are not reclaimed before the
2348 section's contents are written out. This should not happen,
2349 but this way if it does, we get a R_X86_64_NONE reloc instead
2351 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2352 if (s
->contents
== NULL
)
2356 if (htab
->elf
.dynamic_sections_created
)
2358 /* Add some entries to the .dynamic section. We fill in the
2359 values later, in elf64_x86_64_finish_dynamic_sections, but we
2360 must add the entries now so that we get the correct size for
2361 the .dynamic section. The DT_DEBUG entry is filled in by the
2362 dynamic linker and used by the debugger. */
2363 #define add_dynamic_entry(TAG, VAL) \
2364 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2366 if (info
->executable
)
2368 if (!add_dynamic_entry (DT_DEBUG
, 0))
2372 if (htab
->elf
.splt
->size
!= 0)
2374 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2375 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2376 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2377 || !add_dynamic_entry (DT_JMPREL
, 0))
2380 if (htab
->tlsdesc_plt
2381 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2382 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2388 if (!add_dynamic_entry (DT_RELA
, 0)
2389 || !add_dynamic_entry (DT_RELASZ
, 0)
2390 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf64_External_Rela
)))
2393 /* If any dynamic relocs apply to a read-only section,
2394 then we need a DT_TEXTREL entry. */
2395 if ((info
->flags
& DF_TEXTREL
) == 0)
2396 elf_link_hash_traverse (&htab
->elf
,
2397 elf64_x86_64_readonly_dynrelocs
,
2400 if ((info
->flags
& DF_TEXTREL
) != 0)
2402 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2407 #undef add_dynamic_entry
2413 elf64_x86_64_always_size_sections (bfd
*output_bfd
,
2414 struct bfd_link_info
*info
)
2416 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2420 struct elf_link_hash_entry
*tlsbase
;
2422 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2423 "_TLS_MODULE_BASE_",
2424 FALSE
, FALSE
, FALSE
);
2426 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2428 struct bfd_link_hash_entry
*bh
= NULL
;
2429 const struct elf_backend_data
*bed
2430 = get_elf_backend_data (output_bfd
);
2432 if (!(_bfd_generic_link_add_one_symbol
2433 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2434 tls_sec
, 0, NULL
, FALSE
,
2435 bed
->collect
, &bh
)))
2438 elf64_x86_64_hash_table (info
)->tls_module_base
= bh
;
2440 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2441 tlsbase
->def_regular
= 1;
2442 tlsbase
->other
= STV_HIDDEN
;
2443 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2450 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2451 executables. Rather than setting it to the beginning of the TLS
2452 section, we have to set it to the end. This function may be called
2453 multiple times, it is idempotent. */
2456 elf64_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2458 struct bfd_link_hash_entry
*base
;
2460 if (!info
->executable
)
2463 base
= elf64_x86_64_hash_table (info
)->tls_module_base
;
2468 base
->u
.def
.value
= elf_hash_table (info
)->tls_size
;
2471 /* Return the base VMA address which should be subtracted from real addresses
2472 when resolving @dtpoff relocation.
2473 This is PT_TLS segment p_vaddr. */
2476 elf64_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2478 /* If tls_sec is NULL, we should have signalled an error already. */
2479 if (elf_hash_table (info
)->tls_sec
== NULL
)
2481 return elf_hash_table (info
)->tls_sec
->vma
;
2484 /* Return the relocation value for @tpoff relocation
2485 if STT_TLS virtual address is ADDRESS. */
2488 elf64_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2490 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2492 /* If tls_segment is NULL, we should have signalled an error already. */
2493 if (htab
->tls_sec
== NULL
)
2495 return address
- htab
->tls_size
- htab
->tls_sec
->vma
;
2498 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2502 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2504 /* Opcode Instruction
2507 0x0f 0x8x conditional jump */
2509 && (contents
[offset
- 1] == 0xe8
2510 || contents
[offset
- 1] == 0xe9))
2512 && contents
[offset
- 2] == 0x0f
2513 && (contents
[offset
- 1] & 0xf0) == 0x80));
2516 /* Relocate an x86_64 ELF section. */
2519 elf64_x86_64_relocate_section (bfd
*output_bfd
, struct bfd_link_info
*info
,
2520 bfd
*input_bfd
, asection
*input_section
,
2521 bfd_byte
*contents
, Elf_Internal_Rela
*relocs
,
2522 Elf_Internal_Sym
*local_syms
,
2523 asection
**local_sections
)
2525 struct elf64_x86_64_link_hash_table
*htab
;
2526 Elf_Internal_Shdr
*symtab_hdr
;
2527 struct elf_link_hash_entry
**sym_hashes
;
2528 bfd_vma
*local_got_offsets
;
2529 bfd_vma
*local_tlsdesc_gotents
;
2530 Elf_Internal_Rela
*rel
;
2531 Elf_Internal_Rela
*relend
;
2533 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2535 htab
= elf64_x86_64_hash_table (info
);
2536 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2537 sym_hashes
= elf_sym_hashes (input_bfd
);
2538 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2539 local_tlsdesc_gotents
= elf64_x86_64_local_tlsdesc_gotent (input_bfd
);
2541 elf64_x86_64_set_tls_module_base (info
);
2544 relend
= relocs
+ input_section
->reloc_count
;
2545 for (; rel
< relend
; rel
++)
2547 unsigned int r_type
;
2548 reloc_howto_type
*howto
;
2549 unsigned long r_symndx
;
2550 struct elf_link_hash_entry
*h
;
2551 Elf_Internal_Sym
*sym
;
2553 bfd_vma off
, offplt
;
2555 bfd_boolean unresolved_reloc
;
2556 bfd_reloc_status_type r
;
2560 r_type
= ELF64_R_TYPE (rel
->r_info
);
2561 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2562 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2565 if (r_type
>= R_X86_64_max
)
2567 bfd_set_error (bfd_error_bad_value
);
2571 howto
= x86_64_elf_howto_table
+ r_type
;
2572 r_symndx
= ELF64_R_SYM (rel
->r_info
);
2576 unresolved_reloc
= FALSE
;
2577 if (r_symndx
< symtab_hdr
->sh_info
)
2579 sym
= local_syms
+ r_symndx
;
2580 sec
= local_sections
[r_symndx
];
2582 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2585 /* Relocate against local STT_GNU_IFUNC symbol. */
2586 if (ELF64_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2588 h
= elf64_x86_64_get_local_sym_hash (htab
, input_bfd
,
2593 /* Set STT_GNU_IFUNC symbol value. */
2594 h
->root
.u
.def
.value
= sym
->st_value
;
2595 h
->root
.u
.def
.section
= sec
;
2602 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2603 r_symndx
, symtab_hdr
, sym_hashes
,
2605 unresolved_reloc
, warned
);
2608 if (sec
!= NULL
&& elf_discarded_section (sec
))
2610 /* For relocs against symbols from removed linkonce sections,
2611 or sections discarded by a linker script, we just want the
2612 section contents zeroed. Avoid any special processing. */
2613 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2619 if (info
->relocatable
)
2622 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2623 it here if it is defined in a non-shared object. */
2625 && h
->type
== STT_GNU_IFUNC
2631 if ((input_section
->flags
& SEC_ALLOC
) == 0
2632 || h
->plt
.offset
== (bfd_vma
) -1)
2635 /* STT_GNU_IFUNC symbol must go through PLT. */
2636 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
2637 relocation
= (plt
->output_section
->vma
2638 + plt
->output_offset
+ h
->plt
.offset
);
2643 (*_bfd_error_handler
)
2644 (_("%B: relocation %s against STT_GNU_IFUNC "
2645 "symbol `%s' isn't handled by %s"), input_bfd
,
2646 x86_64_elf_howto_table
[r_type
].name
,
2647 (h
->root
.root
.string
2648 ? h
->root
.root
.string
: "a local symbol"),
2650 bfd_set_error (bfd_error_bad_value
);
2659 if (rel
->r_addend
!= 0)
2661 (*_bfd_error_handler
)
2662 (_("%B: relocation %s against STT_GNU_IFUNC "
2663 "symbol `%s' has non-zero addend: %d"),
2664 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2665 (h
->root
.root
.string
2666 ? h
->root
.root
.string
: "a local symbol"),
2668 bfd_set_error (bfd_error_bad_value
);
2672 /* Generate dynamic relcoation only when there is a
2673 non-GOF reference in a shared object. */
2674 if (info
->shared
&& h
->non_got_ref
)
2676 Elf_Internal_Rela outrel
;
2680 /* Need a dynamic relocation to get the real function
2682 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2686 if (outrel
.r_offset
== (bfd_vma
) -1
2687 || outrel
.r_offset
== (bfd_vma
) -2)
2690 outrel
.r_offset
+= (input_section
->output_section
->vma
2691 + input_section
->output_offset
);
2693 if (h
->dynindx
== -1
2695 || info
->executable
)
2697 /* This symbol is resolved locally. */
2698 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_IRELATIVE
);
2699 outrel
.r_addend
= (h
->root
.u
.def
.value
2700 + h
->root
.u
.def
.section
->output_section
->vma
2701 + h
->root
.u
.def
.section
->output_offset
);
2705 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
2706 outrel
.r_addend
= 0;
2709 sreloc
= htab
->elf
.irelifunc
;
2710 loc
= sreloc
->contents
;
2711 loc
+= (sreloc
->reloc_count
++
2712 * sizeof (Elf64_External_Rela
));
2713 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2715 /* If this reloc is against an external symbol, we
2716 do not want to fiddle with the addend. Otherwise,
2717 we need to include the symbol value so that it
2718 becomes an addend for the dynamic reloc. For an
2719 internal symbol, we have updated addend. */
2726 case R_X86_64_PLT32
:
2729 case R_X86_64_GOTPCREL
:
2730 case R_X86_64_GOTPCREL64
:
2731 base_got
= htab
->elf
.sgot
;
2732 off
= h
->got
.offset
;
2734 if (base_got
== NULL
)
2737 if (off
== (bfd_vma
) -1)
2739 /* We can't use h->got.offset here to save state, or
2740 even just remember the offset, as finish_dynamic_symbol
2741 would use that as offset into .got. */
2743 if (htab
->elf
.splt
!= NULL
)
2745 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2746 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2747 base_got
= htab
->elf
.sgotplt
;
2751 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
2752 off
= plt_index
* GOT_ENTRY_SIZE
;
2753 base_got
= htab
->elf
.igotplt
;
2756 if (h
->dynindx
== -1
2760 /* This references the local defitionion. We must
2761 initialize this entry in the global offset table.
2762 Since the offset must always be a multiple of 8,
2763 we use the least significant bit to record
2764 whether we have initialized it already.
2766 When doing a dynamic link, we create a .rela.got
2767 relocation entry to initialize the value. This
2768 is done in the finish_dynamic_symbol routine. */
2773 bfd_put_64 (output_bfd
, relocation
,
2774 base_got
->contents
+ off
);
2775 /* Note that this is harmless for the GOTPLT64
2776 case, as -1 | 1 still is -1. */
2782 relocation
= (base_got
->output_section
->vma
2783 + base_got
->output_offset
+ off
);
2785 if (r_type
!= R_X86_64_GOTPCREL
2786 && r_type
!= R_X86_64_GOTPCREL64
)
2789 if (htab
->elf
.splt
!= NULL
)
2790 gotplt
= htab
->elf
.sgotplt
;
2792 gotplt
= htab
->elf
.igotplt
;
2793 relocation
-= (gotplt
->output_section
->vma
2794 - gotplt
->output_offset
);
2801 /* When generating a shared object, the relocations handled here are
2802 copied into the output file to be resolved at run time. */
2805 case R_X86_64_GOT32
:
2806 case R_X86_64_GOT64
:
2807 /* Relocation is to the entry for this symbol in the global
2809 case R_X86_64_GOTPCREL
:
2810 case R_X86_64_GOTPCREL64
:
2811 /* Use global offset table entry as symbol value. */
2812 case R_X86_64_GOTPLT64
:
2813 /* This is the same as GOT64 for relocation purposes, but
2814 indicates the existence of a PLT entry. The difficulty is,
2815 that we must calculate the GOT slot offset from the PLT
2816 offset, if this symbol got a PLT entry (it was global).
2817 Additionally if it's computed from the PLT entry, then that
2818 GOT offset is relative to .got.plt, not to .got. */
2819 base_got
= htab
->elf
.sgot
;
2821 if (htab
->elf
.sgot
== NULL
)
2828 off
= h
->got
.offset
;
2830 && h
->plt
.offset
!= (bfd_vma
)-1
2831 && off
== (bfd_vma
)-1)
2833 /* We can't use h->got.offset here to save
2834 state, or even just remember the offset, as
2835 finish_dynamic_symbol would use that as offset into
2837 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2838 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2839 base_got
= htab
->elf
.sgotplt
;
2842 dyn
= htab
->elf
.dynamic_sections_created
;
2844 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
2846 && SYMBOL_REFERENCES_LOCAL (info
, h
))
2847 || (ELF_ST_VISIBILITY (h
->other
)
2848 && h
->root
.type
== bfd_link_hash_undefweak
))
2850 /* This is actually a static link, or it is a -Bsymbolic
2851 link and the symbol is defined locally, or the symbol
2852 was forced to be local because of a version file. We
2853 must initialize this entry in the global offset table.
2854 Since the offset must always be a multiple of 8, we
2855 use the least significant bit to record whether we
2856 have initialized it already.
2858 When doing a dynamic link, we create a .rela.got
2859 relocation entry to initialize the value. This is
2860 done in the finish_dynamic_symbol routine. */
2865 bfd_put_64 (output_bfd
, relocation
,
2866 base_got
->contents
+ off
);
2867 /* Note that this is harmless for the GOTPLT64 case,
2868 as -1 | 1 still is -1. */
2873 unresolved_reloc
= FALSE
;
2877 if (local_got_offsets
== NULL
)
2880 off
= local_got_offsets
[r_symndx
];
2882 /* The offset must always be a multiple of 8. We use
2883 the least significant bit to record whether we have
2884 already generated the necessary reloc. */
2889 bfd_put_64 (output_bfd
, relocation
,
2890 base_got
->contents
+ off
);
2895 Elf_Internal_Rela outrel
;
2898 /* We need to generate a R_X86_64_RELATIVE reloc
2899 for the dynamic linker. */
2900 s
= htab
->elf
.srelgot
;
2904 outrel
.r_offset
= (base_got
->output_section
->vma
2905 + base_got
->output_offset
2907 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
2908 outrel
.r_addend
= relocation
;
2910 loc
+= s
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2911 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2914 local_got_offsets
[r_symndx
] |= 1;
2918 if (off
>= (bfd_vma
) -2)
2921 relocation
= base_got
->output_section
->vma
2922 + base_got
->output_offset
+ off
;
2923 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
2924 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
2925 - htab
->elf
.sgotplt
->output_offset
;
2929 case R_X86_64_GOTOFF64
:
2930 /* Relocation is relative to the start of the global offset
2933 /* Check to make sure it isn't a protected function symbol
2934 for shared library since it may not be local when used
2935 as function address. */
2939 && h
->type
== STT_FUNC
2940 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
2942 (*_bfd_error_handler
)
2943 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
2944 input_bfd
, h
->root
.root
.string
);
2945 bfd_set_error (bfd_error_bad_value
);
2949 /* Note that sgot is not involved in this
2950 calculation. We always want the start of .got.plt. If we
2951 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2952 permitted by the ABI, we might have to change this
2954 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
2955 + htab
->elf
.sgotplt
->output_offset
;
2958 case R_X86_64_GOTPC32
:
2959 case R_X86_64_GOTPC64
:
2960 /* Use global offset table as symbol value. */
2961 relocation
= htab
->elf
.sgotplt
->output_section
->vma
2962 + htab
->elf
.sgotplt
->output_offset
;
2963 unresolved_reloc
= FALSE
;
2966 case R_X86_64_PLTOFF64
:
2967 /* Relocation is PLT entry relative to GOT. For local
2968 symbols it's the symbol itself relative to GOT. */
2970 /* See PLT32 handling. */
2971 && h
->plt
.offset
!= (bfd_vma
) -1
2972 && htab
->elf
.splt
!= NULL
)
2974 relocation
= (htab
->elf
.splt
->output_section
->vma
2975 + htab
->elf
.splt
->output_offset
2977 unresolved_reloc
= FALSE
;
2980 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
2981 + htab
->elf
.sgotplt
->output_offset
;
2984 case R_X86_64_PLT32
:
2985 /* Relocation is to the entry for this symbol in the
2986 procedure linkage table. */
2988 /* Resolve a PLT32 reloc against a local symbol directly,
2989 without using the procedure linkage table. */
2993 if (h
->plt
.offset
== (bfd_vma
) -1
2994 || htab
->elf
.splt
== NULL
)
2996 /* We didn't make a PLT entry for this symbol. This
2997 happens when statically linking PIC code, or when
2998 using -Bsymbolic. */
3002 relocation
= (htab
->elf
.splt
->output_section
->vma
3003 + htab
->elf
.splt
->output_offset
3005 unresolved_reloc
= FALSE
;
3012 && (input_section
->flags
& SEC_ALLOC
) != 0
3013 && (input_section
->flags
& SEC_READONLY
) != 0
3016 bfd_boolean fail
= FALSE
;
3018 = (r_type
== R_X86_64_PC32
3019 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3021 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3023 /* Symbol is referenced locally. Make sure it is
3024 defined locally or for a branch. */
3025 fail
= !h
->def_regular
&& !branch
;
3029 /* Symbol isn't referenced locally. We only allow
3030 branch to symbol with non-default visibility. */
3032 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3039 const char *pic
= "";
3041 switch (ELF_ST_VISIBILITY (h
->other
))
3044 v
= _("hidden symbol");
3047 v
= _("internal symbol");
3050 v
= _("protected symbol");
3054 pic
= _("; recompile with -fPIC");
3059 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3061 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3063 (*_bfd_error_handler
) (fmt
, input_bfd
,
3064 x86_64_elf_howto_table
[r_type
].name
,
3065 v
, h
->root
.root
.string
, pic
);
3066 bfd_set_error (bfd_error_bad_value
);
3077 /* FIXME: The ABI says the linker should make sure the value is
3078 the same when it's zeroextended to 64 bit. */
3080 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3085 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3086 || h
->root
.type
!= bfd_link_hash_undefweak
)
3087 && (! IS_X86_64_PCREL_TYPE (r_type
)
3088 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3089 || (ELIMINATE_COPY_RELOCS
3096 || h
->root
.type
== bfd_link_hash_undefweak
3097 || h
->root
.type
== bfd_link_hash_undefined
)))
3099 Elf_Internal_Rela outrel
;
3101 bfd_boolean skip
, relocate
;
3104 /* When generating a shared object, these relocations
3105 are copied into the output file to be resolved at run
3111 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3113 if (outrel
.r_offset
== (bfd_vma
) -1)
3115 else if (outrel
.r_offset
== (bfd_vma
) -2)
3116 skip
= TRUE
, relocate
= TRUE
;
3118 outrel
.r_offset
+= (input_section
->output_section
->vma
3119 + input_section
->output_offset
);
3122 memset (&outrel
, 0, sizeof outrel
);
3124 /* h->dynindx may be -1 if this symbol was marked to
3128 && (IS_X86_64_PCREL_TYPE (r_type
)
3130 || ! SYMBOLIC_BIND (info
, h
)
3131 || ! h
->def_regular
))
3133 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
3134 outrel
.r_addend
= rel
->r_addend
;
3138 /* This symbol is local, or marked to become local. */
3139 if (r_type
== R_X86_64_64
)
3142 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3143 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3149 if (bfd_is_abs_section (sec
))
3151 else if (sec
== NULL
|| sec
->owner
== NULL
)
3153 bfd_set_error (bfd_error_bad_value
);
3160 /* We are turning this relocation into one
3161 against a section symbol. It would be
3162 proper to subtract the symbol's value,
3163 osec->vma, from the emitted reloc addend,
3164 but ld.so expects buggy relocs. */
3165 osec
= sec
->output_section
;
3166 sindx
= elf_section_data (osec
)->dynindx
;
3169 asection
*oi
= htab
->elf
.text_index_section
;
3170 sindx
= elf_section_data (oi
)->dynindx
;
3172 BFD_ASSERT (sindx
!= 0);
3175 outrel
.r_info
= ELF64_R_INFO (sindx
, r_type
);
3176 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3180 sreloc
= elf_section_data (input_section
)->sreloc
;
3182 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
3184 loc
= sreloc
->contents
;
3185 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3186 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3188 /* If this reloc is against an external symbol, we do
3189 not want to fiddle with the addend. Otherwise, we
3190 need to include the symbol value so that it becomes
3191 an addend for the dynamic reloc. */
3198 case R_X86_64_TLSGD
:
3199 case R_X86_64_GOTPC32_TLSDESC
:
3200 case R_X86_64_TLSDESC_CALL
:
3201 case R_X86_64_GOTTPOFF
:
3202 tls_type
= GOT_UNKNOWN
;
3203 if (h
== NULL
&& local_got_offsets
)
3204 tls_type
= elf64_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3206 tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
3208 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3209 input_section
, contents
,
3210 symtab_hdr
, sym_hashes
,
3211 &r_type
, tls_type
, rel
,
3215 if (r_type
== R_X86_64_TPOFF32
)
3217 bfd_vma roff
= rel
->r_offset
;
3219 BFD_ASSERT (! unresolved_reloc
);
3221 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3223 /* GD->LE transition.
3224 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3225 .word 0x6666; rex64; call __tls_get_addr
3228 leaq foo@tpoff(%rax), %rax */
3229 memcpy (contents
+ roff
- 4,
3230 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3232 bfd_put_32 (output_bfd
,
3233 elf64_x86_64_tpoff (info
, relocation
),
3234 contents
+ roff
+ 8);
3235 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3239 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3241 /* GDesc -> LE transition.
3242 It's originally something like:
3243 leaq x@tlsdesc(%rip), %rax
3249 unsigned int val
, type
, type2
;
3251 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3252 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3253 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3254 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3255 contents
+ roff
- 3);
3256 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3257 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3258 contents
+ roff
- 1);
3259 bfd_put_32 (output_bfd
,
3260 elf64_x86_64_tpoff (info
, relocation
),
3264 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3266 /* GDesc -> LE transition.
3271 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3272 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3275 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3277 /* IE->LE transition:
3278 Originally it can be one of:
3279 movq foo@gottpoff(%rip), %reg
3280 addq foo@gottpoff(%rip), %reg
3283 leaq foo(%reg), %reg
3286 unsigned int val
, type
, reg
;
3288 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3289 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3290 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3296 bfd_put_8 (output_bfd
, 0x49,
3297 contents
+ roff
- 3);
3298 bfd_put_8 (output_bfd
, 0xc7,
3299 contents
+ roff
- 2);
3300 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3301 contents
+ roff
- 1);
3305 /* addq -> addq - addressing with %rsp/%r12 is
3308 bfd_put_8 (output_bfd
, 0x49,
3309 contents
+ roff
- 3);
3310 bfd_put_8 (output_bfd
, 0x81,
3311 contents
+ roff
- 2);
3312 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3313 contents
+ roff
- 1);
3319 bfd_put_8 (output_bfd
, 0x4d,
3320 contents
+ roff
- 3);
3321 bfd_put_8 (output_bfd
, 0x8d,
3322 contents
+ roff
- 2);
3323 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3324 contents
+ roff
- 1);
3326 bfd_put_32 (output_bfd
,
3327 elf64_x86_64_tpoff (info
, relocation
),
3335 if (htab
->elf
.sgot
== NULL
)
3340 off
= h
->got
.offset
;
3341 offplt
= elf64_x86_64_hash_entry (h
)->tlsdesc_got
;
3345 if (local_got_offsets
== NULL
)
3348 off
= local_got_offsets
[r_symndx
];
3349 offplt
= local_tlsdesc_gotents
[r_symndx
];
3356 Elf_Internal_Rela outrel
;
3361 if (htab
->elf
.srelgot
== NULL
)
3364 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3366 if (GOT_TLS_GDESC_P (tls_type
))
3368 outrel
.r_info
= ELF64_R_INFO (indx
, R_X86_64_TLSDESC
);
3369 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3370 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3371 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3372 + htab
->elf
.sgotplt
->output_offset
3374 + htab
->sgotplt_jump_table_size
);
3375 sreloc
= htab
->elf
.srelplt
;
3376 loc
= sreloc
->contents
;
3377 loc
+= sreloc
->reloc_count
++
3378 * sizeof (Elf64_External_Rela
);
3379 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3380 <= sreloc
->contents
+ sreloc
->size
);
3382 outrel
.r_addend
= relocation
- elf64_x86_64_dtpoff_base (info
);
3384 outrel
.r_addend
= 0;
3385 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3388 sreloc
= htab
->elf
.srelgot
;
3390 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3391 + htab
->elf
.sgot
->output_offset
+ off
);
3393 if (GOT_TLS_GD_P (tls_type
))
3394 dr_type
= R_X86_64_DTPMOD64
;
3395 else if (GOT_TLS_GDESC_P (tls_type
))
3398 dr_type
= R_X86_64_TPOFF64
;
3400 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3401 outrel
.r_addend
= 0;
3402 if ((dr_type
== R_X86_64_TPOFF64
3403 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3404 outrel
.r_addend
= relocation
- elf64_x86_64_dtpoff_base (info
);
3405 outrel
.r_info
= ELF64_R_INFO (indx
, dr_type
);
3407 loc
= sreloc
->contents
;
3408 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3409 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3410 <= sreloc
->contents
+ sreloc
->size
);
3411 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3413 if (GOT_TLS_GD_P (tls_type
))
3417 BFD_ASSERT (! unresolved_reloc
);
3418 bfd_put_64 (output_bfd
,
3419 relocation
- elf64_x86_64_dtpoff_base (info
),
3420 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3424 bfd_put_64 (output_bfd
, 0,
3425 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3426 outrel
.r_info
= ELF64_R_INFO (indx
,
3428 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3429 sreloc
->reloc_count
++;
3430 loc
+= sizeof (Elf64_External_Rela
);
3431 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3432 <= sreloc
->contents
+ sreloc
->size
);
3433 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3441 local_got_offsets
[r_symndx
] |= 1;
3444 if (off
>= (bfd_vma
) -2
3445 && ! GOT_TLS_GDESC_P (tls_type
))
3447 if (r_type
== ELF64_R_TYPE (rel
->r_info
))
3449 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3450 || r_type
== R_X86_64_TLSDESC_CALL
)
3451 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3452 + htab
->elf
.sgotplt
->output_offset
3453 + offplt
+ htab
->sgotplt_jump_table_size
;
3455 relocation
= htab
->elf
.sgot
->output_section
->vma
3456 + htab
->elf
.sgot
->output_offset
+ off
;
3457 unresolved_reloc
= FALSE
;
3461 bfd_vma roff
= rel
->r_offset
;
3463 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3465 /* GD->IE transition.
3466 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3467 .word 0x6666; rex64; call __tls_get_addr@plt
3470 addq foo@gottpoff(%rip), %rax */
3471 memcpy (contents
+ roff
- 4,
3472 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3475 relocation
= (htab
->elf
.sgot
->output_section
->vma
3476 + htab
->elf
.sgot
->output_offset
+ off
3478 - input_section
->output_section
->vma
3479 - input_section
->output_offset
3481 bfd_put_32 (output_bfd
, relocation
,
3482 contents
+ roff
+ 8);
3483 /* Skip R_X86_64_PLT32. */
3487 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3489 /* GDesc -> IE transition.
3490 It's originally something like:
3491 leaq x@tlsdesc(%rip), %rax
3494 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3497 unsigned int val
, type
, type2
;
3499 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3500 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3501 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3503 /* Now modify the instruction as appropriate. To
3504 turn a leaq into a movq in the form we use it, it
3505 suffices to change the second byte from 0x8d to
3507 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3509 bfd_put_32 (output_bfd
,
3510 htab
->elf
.sgot
->output_section
->vma
3511 + htab
->elf
.sgot
->output_offset
+ off
3513 - input_section
->output_section
->vma
3514 - input_section
->output_offset
3519 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3521 /* GDesc -> IE transition.
3528 unsigned int val
, type
;
3530 type
= bfd_get_8 (input_bfd
, contents
+ roff
);
3531 val
= bfd_get_8 (input_bfd
, contents
+ roff
+ 1);
3532 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3533 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3541 case R_X86_64_TLSLD
:
3542 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3543 input_section
, contents
,
3544 symtab_hdr
, sym_hashes
,
3545 &r_type
, GOT_UNKNOWN
,
3549 if (r_type
!= R_X86_64_TLSLD
)
3551 /* LD->LE transition:
3552 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3554 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3556 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3557 memcpy (contents
+ rel
->r_offset
- 3,
3558 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3559 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3564 if (htab
->elf
.sgot
== NULL
)
3567 off
= htab
->tls_ld_got
.offset
;
3572 Elf_Internal_Rela outrel
;
3575 if (htab
->elf
.srelgot
== NULL
)
3578 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3579 + htab
->elf
.sgot
->output_offset
+ off
);
3581 bfd_put_64 (output_bfd
, 0,
3582 htab
->elf
.sgot
->contents
+ off
);
3583 bfd_put_64 (output_bfd
, 0,
3584 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3585 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_DTPMOD64
);
3586 outrel
.r_addend
= 0;
3587 loc
= htab
->elf
.srelgot
->contents
;
3588 loc
+= htab
->elf
.srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3589 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3590 htab
->tls_ld_got
.offset
|= 1;
3592 relocation
= htab
->elf
.sgot
->output_section
->vma
3593 + htab
->elf
.sgot
->output_offset
+ off
;
3594 unresolved_reloc
= FALSE
;
3597 case R_X86_64_DTPOFF32
:
3598 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
3599 relocation
-= elf64_x86_64_dtpoff_base (info
);
3601 relocation
= elf64_x86_64_tpoff (info
, relocation
);
3604 case R_X86_64_TPOFF32
:
3605 BFD_ASSERT (! info
->shared
);
3606 relocation
= elf64_x86_64_tpoff (info
, relocation
);
3613 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3614 because such sections are not SEC_ALLOC and thus ld.so will
3615 not process them. */
3616 if (unresolved_reloc
3617 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3619 (*_bfd_error_handler
)
3620 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3623 (long) rel
->r_offset
,
3625 h
->root
.root
.string
);
3628 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3629 contents
, rel
->r_offset
,
3630 relocation
, rel
->r_addend
);
3632 if (r
!= bfd_reloc_ok
)
3637 name
= h
->root
.root
.string
;
3640 name
= bfd_elf_string_from_elf_section (input_bfd
,
3641 symtab_hdr
->sh_link
,
3646 name
= bfd_section_name (input_bfd
, sec
);
3649 if (r
== bfd_reloc_overflow
)
3651 if (! ((*info
->callbacks
->reloc_overflow
)
3652 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3653 (bfd_vma
) 0, input_bfd
, input_section
,
3659 (*_bfd_error_handler
)
3660 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3661 input_bfd
, input_section
,
3662 (long) rel
->r_offset
, name
, (int) r
);
3671 /* Finish up dynamic symbol handling. We set the contents of various
3672 dynamic sections here. */
3675 elf64_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3676 struct bfd_link_info
*info
,
3677 struct elf_link_hash_entry
*h
,
3678 Elf_Internal_Sym
*sym
)
3680 struct elf64_x86_64_link_hash_table
*htab
;
3682 htab
= elf64_x86_64_hash_table (info
);
3684 if (h
->plt
.offset
!= (bfd_vma
) -1)
3688 Elf_Internal_Rela rela
;
3690 asection
*plt
, *gotplt
, *relplt
;
3692 /* When building a static executable, use .iplt, .igot.plt and
3693 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3694 if (htab
->elf
.splt
!= NULL
)
3696 plt
= htab
->elf
.splt
;
3697 gotplt
= htab
->elf
.sgotplt
;
3698 relplt
= htab
->elf
.srelplt
;
3702 plt
= htab
->elf
.iplt
;
3703 gotplt
= htab
->elf
.igotplt
;
3704 relplt
= htab
->elf
.irelplt
;
3707 /* This symbol has an entry in the procedure linkage table. Set
3709 if ((h
->dynindx
== -1
3710 && !((h
->forced_local
|| info
->executable
)
3712 && h
->type
== STT_GNU_IFUNC
))
3718 /* Get the index in the procedure linkage table which
3719 corresponds to this symbol. This is the index of this symbol
3720 in all the symbols for which we are making plt entries. The
3721 first entry in the procedure linkage table is reserved.
3723 Get the offset into the .got table of the entry that
3724 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3725 bytes. The first three are reserved for the dynamic linker.
3727 For static executables, we don't reserve anything. */
3729 if (plt
== htab
->elf
.splt
)
3731 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3732 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3736 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3737 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
3740 /* Fill in the entry in the procedure linkage table. */
3741 memcpy (plt
->contents
+ h
->plt
.offset
, elf64_x86_64_plt_entry
,
3744 /* Insert the relocation positions of the plt section. The magic
3745 numbers at the end of the statements are the positions of the
3746 relocations in the plt section. */
3747 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3748 instruction uses 6 bytes, subtract this value. */
3749 bfd_put_32 (output_bfd
,
3750 (gotplt
->output_section
->vma
3751 + gotplt
->output_offset
3753 - plt
->output_section
->vma
3754 - plt
->output_offset
3757 plt
->contents
+ h
->plt
.offset
+ 2);
3759 /* Don't fill PLT entry for static executables. */
3760 if (plt
== htab
->elf
.splt
)
3762 /* Put relocation index. */
3763 bfd_put_32 (output_bfd
, plt_index
,
3764 plt
->contents
+ h
->plt
.offset
+ 7);
3765 /* Put offset for jmp .PLT0. */
3766 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3767 plt
->contents
+ h
->plt
.offset
+ 12);
3770 /* Fill in the entry in the global offset table, initially this
3771 points to the pushq instruction in the PLT which is at offset 6. */
3772 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
3773 + plt
->output_offset
3774 + h
->plt
.offset
+ 6),
3775 gotplt
->contents
+ got_offset
);
3777 /* Fill in the entry in the .rela.plt section. */
3778 rela
.r_offset
= (gotplt
->output_section
->vma
3779 + gotplt
->output_offset
3781 if (h
->dynindx
== -1
3782 || ((info
->executable
3783 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
3785 && h
->type
== STT_GNU_IFUNC
))
3787 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3788 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3789 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_IRELATIVE
);
3790 rela
.r_addend
= (h
->root
.u
.def
.value
3791 + h
->root
.u
.def
.section
->output_section
->vma
3792 + h
->root
.u
.def
.section
->output_offset
);
3796 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_JUMP_SLOT
);
3799 loc
= relplt
->contents
+ plt_index
* sizeof (Elf64_External_Rela
);
3800 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3802 if (!h
->def_regular
)
3804 /* Mark the symbol as undefined, rather than as defined in
3805 the .plt section. Leave the value if there were any
3806 relocations where pointer equality matters (this is a clue
3807 for the dynamic linker, to make function pointer
3808 comparisons work between an application and shared
3809 library), otherwise set it to zero. If a function is only
3810 called from a binary, there is no need to slow down
3811 shared libraries because of that. */
3812 sym
->st_shndx
= SHN_UNDEF
;
3813 if (!h
->pointer_equality_needed
)
3818 if (h
->got
.offset
!= (bfd_vma
) -1
3819 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h
)->tls_type
)
3820 && elf64_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
3822 Elf_Internal_Rela rela
;
3825 /* This symbol has an entry in the global offset table. Set it
3827 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
3830 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3831 + htab
->elf
.sgot
->output_offset
3832 + (h
->got
.offset
&~ (bfd_vma
) 1));
3834 /* If this is a static link, or it is a -Bsymbolic link and the
3835 symbol is defined locally or was forced to be local because
3836 of a version file, we just want to emit a RELATIVE reloc.
3837 The entry in the global offset table will already have been
3838 initialized in the relocate_section function. */
3840 && h
->type
== STT_GNU_IFUNC
)
3844 /* Generate R_X86_64_GLOB_DAT. */
3849 if (!h
->pointer_equality_needed
)
3852 /* For non-shared object, we can't use .got.plt, which
3853 contains the real function addres if we need pointer
3854 equality. We load the GOT entry with the PLT entry. */
3855 asection
*plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
3856 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
3857 + plt
->output_offset
3859 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
3863 else if (info
->shared
3864 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3866 if (!h
->def_regular
)
3868 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3869 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3870 rela
.r_addend
= (h
->root
.u
.def
.value
3871 + h
->root
.u
.def
.section
->output_section
->vma
3872 + h
->root
.u
.def
.section
->output_offset
);
3876 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3878 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
3879 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
3880 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_GLOB_DAT
);
3884 loc
= htab
->elf
.srelgot
->contents
;
3885 loc
+= htab
->elf
.srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3886 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3891 Elf_Internal_Rela rela
;
3894 /* This symbol needs a copy reloc. Set it up. */
3896 if (h
->dynindx
== -1
3897 || (h
->root
.type
!= bfd_link_hash_defined
3898 && h
->root
.type
!= bfd_link_hash_defweak
)
3899 || htab
->srelbss
== NULL
)
3902 rela
.r_offset
= (h
->root
.u
.def
.value
3903 + h
->root
.u
.def
.section
->output_section
->vma
3904 + h
->root
.u
.def
.section
->output_offset
);
3905 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_COPY
);
3907 loc
= htab
->srelbss
->contents
;
3908 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3909 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3912 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
3913 be NULL for local symbols. */
3915 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3916 || h
== htab
->elf
.hgot
))
3917 sym
->st_shndx
= SHN_ABS
;
3922 /* Finish up local dynamic symbol handling. We set the contents of
3923 various dynamic sections here. */
3926 elf64_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
3928 struct elf_link_hash_entry
*h
3929 = (struct elf_link_hash_entry
*) *slot
;
3930 struct bfd_link_info
*info
3931 = (struct bfd_link_info
*) inf
;
3933 return elf64_x86_64_finish_dynamic_symbol (info
->output_bfd
,
3937 /* Used to decide how to sort relocs in an optimal manner for the
3938 dynamic linker, before writing them out. */
3940 static enum elf_reloc_type_class
3941 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
3943 switch ((int) ELF64_R_TYPE (rela
->r_info
))
3945 case R_X86_64_RELATIVE
:
3946 return reloc_class_relative
;
3947 case R_X86_64_JUMP_SLOT
:
3948 return reloc_class_plt
;
3950 return reloc_class_copy
;
3952 return reloc_class_normal
;
3956 /* Finish up the dynamic sections. */
3959 elf64_x86_64_finish_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
3961 struct elf64_x86_64_link_hash_table
*htab
;
3965 htab
= elf64_x86_64_hash_table (info
);
3966 dynobj
= htab
->elf
.dynobj
;
3967 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3969 if (htab
->elf
.dynamic_sections_created
)
3971 Elf64_External_Dyn
*dyncon
, *dynconend
;
3973 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
3976 dyncon
= (Elf64_External_Dyn
*) sdyn
->contents
;
3977 dynconend
= (Elf64_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3978 for (; dyncon
< dynconend
; dyncon
++)
3980 Elf_Internal_Dyn dyn
;
3983 bfd_elf64_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3991 s
= htab
->elf
.sgotplt
;
3992 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3996 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4000 s
= htab
->elf
.srelplt
->output_section
;
4001 dyn
.d_un
.d_val
= s
->size
;
4005 /* The procedure linkage table relocs (DT_JMPREL) should
4006 not be included in the overall relocs (DT_RELA).
4007 Therefore, we override the DT_RELASZ entry here to
4008 make it not include the JMPREL relocs. Since the
4009 linker script arranges for .rela.plt to follow all
4010 other relocation sections, we don't have to worry
4011 about changing the DT_RELA entry. */
4012 if (htab
->elf
.srelplt
!= NULL
)
4014 s
= htab
->elf
.srelplt
->output_section
;
4015 dyn
.d_un
.d_val
-= s
->size
;
4019 case DT_TLSDESC_PLT
:
4021 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4022 + htab
->tlsdesc_plt
;
4025 case DT_TLSDESC_GOT
:
4027 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4028 + htab
->tlsdesc_got
;
4032 bfd_elf64_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4035 /* Fill in the special first entry in the procedure linkage table. */
4036 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4038 /* Fill in the first entry in the procedure linkage table. */
4039 memcpy (htab
->elf
.splt
->contents
, elf64_x86_64_plt0_entry
,
4041 /* Add offset for pushq GOT+8(%rip), since the instruction
4042 uses 6 bytes subtract this value. */
4043 bfd_put_32 (output_bfd
,
4044 (htab
->elf
.sgotplt
->output_section
->vma
4045 + htab
->elf
.sgotplt
->output_offset
4047 - htab
->elf
.splt
->output_section
->vma
4048 - htab
->elf
.splt
->output_offset
4050 htab
->elf
.splt
->contents
+ 2);
4051 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4052 the end of the instruction. */
4053 bfd_put_32 (output_bfd
,
4054 (htab
->elf
.sgotplt
->output_section
->vma
4055 + htab
->elf
.sgotplt
->output_offset
4057 - htab
->elf
.splt
->output_section
->vma
4058 - htab
->elf
.splt
->output_offset
4060 htab
->elf
.splt
->contents
+ 8);
4062 elf_section_data (htab
->elf
.splt
->output_section
)->this_hdr
.sh_entsize
=
4065 if (htab
->tlsdesc_plt
)
4067 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4068 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4070 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4071 elf64_x86_64_plt0_entry
,
4074 /* Add offset for pushq GOT+8(%rip), since the
4075 instruction uses 6 bytes subtract this value. */
4076 bfd_put_32 (output_bfd
,
4077 (htab
->elf
.sgotplt
->output_section
->vma
4078 + htab
->elf
.sgotplt
->output_offset
4080 - htab
->elf
.splt
->output_section
->vma
4081 - htab
->elf
.splt
->output_offset
4084 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4085 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4086 htab->tlsdesc_got. The 12 is the offset to the end of
4088 bfd_put_32 (output_bfd
,
4089 (htab
->elf
.sgot
->output_section
->vma
4090 + htab
->elf
.sgot
->output_offset
4092 - htab
->elf
.splt
->output_section
->vma
4093 - htab
->elf
.splt
->output_offset
4096 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4101 if (htab
->elf
.sgotplt
)
4103 /* Fill in the first three entries in the global offset table. */
4104 if (htab
->elf
.sgotplt
->size
> 0)
4106 /* Set the first entry in the global offset table to the address of
4107 the dynamic section. */
4109 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4111 bfd_put_64 (output_bfd
,
4112 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4113 htab
->elf
.sgotplt
->contents
);
4114 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4115 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4116 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4119 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4123 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4124 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4127 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4128 htab_traverse (htab
->loc_hash_table
,
4129 elf64_x86_64_finish_local_dynamic_symbol
,
4135 /* Return address for Ith PLT stub in section PLT, for relocation REL
4136 or (bfd_vma) -1 if it should not be included. */
4139 elf64_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4140 const arelent
*rel ATTRIBUTE_UNUSED
)
4142 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4145 /* Handle an x86-64 specific section when reading an object file. This
4146 is called when elfcode.h finds a section with an unknown type. */
4149 elf64_x86_64_section_from_shdr (bfd
*abfd
,
4150 Elf_Internal_Shdr
*hdr
,
4154 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4157 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4163 /* Hook called by the linker routine which adds symbols from an object
4164 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4168 elf64_x86_64_add_symbol_hook (bfd
*abfd
,
4169 struct bfd_link_info
*info
,
4170 Elf_Internal_Sym
*sym
,
4171 const char **namep ATTRIBUTE_UNUSED
,
4172 flagword
*flagsp ATTRIBUTE_UNUSED
,
4178 switch (sym
->st_shndx
)
4180 case SHN_X86_64_LCOMMON
:
4181 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4184 lcomm
= bfd_make_section_with_flags (abfd
,
4188 | SEC_LINKER_CREATED
));
4191 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4194 *valp
= sym
->st_size
;
4198 if (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4199 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4205 /* Given a BFD section, try to locate the corresponding ELF section
4209 elf64_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4210 asection
*sec
, int *index
)
4212 if (sec
== &_bfd_elf_large_com_section
)
4214 *index
= SHN_X86_64_LCOMMON
;
4220 /* Process a symbol. */
4223 elf64_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4226 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4228 switch (elfsym
->internal_elf_sym
.st_shndx
)
4230 case SHN_X86_64_LCOMMON
:
4231 asym
->section
= &_bfd_elf_large_com_section
;
4232 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4233 /* Common symbol doesn't set BSF_GLOBAL. */
4234 asym
->flags
&= ~BSF_GLOBAL
;
4240 elf64_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4242 return (sym
->st_shndx
== SHN_COMMON
4243 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4247 elf64_x86_64_common_section_index (asection
*sec
)
4249 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4252 return SHN_X86_64_LCOMMON
;
4256 elf64_x86_64_common_section (asection
*sec
)
4258 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4259 return bfd_com_section_ptr
;
4261 return &_bfd_elf_large_com_section
;
4265 elf64_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4266 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4267 struct elf_link_hash_entry
*h
,
4268 Elf_Internal_Sym
*sym
,
4270 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4271 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4272 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4273 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4274 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4275 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4276 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4277 bfd_boolean
*newdyn
,
4278 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4279 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4280 bfd
*abfd ATTRIBUTE_UNUSED
,
4282 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4283 bfd_boolean
*olddyn
,
4284 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4285 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4289 /* A normal common symbol and a large common symbol result in a
4290 normal common symbol. We turn the large common symbol into a
4293 && h
->root
.type
== bfd_link_hash_common
4295 && bfd_is_com_section (*sec
)
4298 if (sym
->st_shndx
== SHN_COMMON
4299 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4301 h
->root
.u
.c
.p
->section
4302 = bfd_make_section_old_way (oldbfd
, "COMMON");
4303 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4305 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4306 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4307 *psec
= *sec
= bfd_com_section_ptr
;
4314 elf64_x86_64_additional_program_headers (bfd
*abfd
,
4315 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4320 /* Check to see if we need a large readonly segment. */
4321 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4322 if (s
&& (s
->flags
& SEC_LOAD
))
4325 /* Check to see if we need a large data segment. Since .lbss sections
4326 is placed right after the .bss section, there should be no need for
4327 a large data segment just because of .lbss. */
4328 s
= bfd_get_section_by_name (abfd
, ".ldata");
4329 if (s
&& (s
->flags
& SEC_LOAD
))
4335 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4338 elf64_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4340 if (h
->plt
.offset
!= (bfd_vma
) -1
4342 && !h
->pointer_equality_needed
)
4345 return _bfd_elf_hash_symbol (h
);
4348 static const struct bfd_elf_special_section
4349 elf64_x86_64_special_sections
[]=
4351 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4352 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4353 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4354 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4355 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4356 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4357 { NULL
, 0, 0, 0, 0 }
4360 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4361 #define TARGET_LITTLE_NAME "elf64-x86-64"
4362 #define ELF_ARCH bfd_arch_i386
4363 #define ELF_MACHINE_CODE EM_X86_64
4364 #define ELF_MAXPAGESIZE 0x200000
4365 #define ELF_MINPAGESIZE 0x1000
4366 #define ELF_COMMONPAGESIZE 0x1000
4368 #define elf_backend_can_gc_sections 1
4369 #define elf_backend_can_refcount 1
4370 #define elf_backend_want_got_plt 1
4371 #define elf_backend_plt_readonly 1
4372 #define elf_backend_want_plt_sym 0
4373 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4374 #define elf_backend_rela_normal 1
4376 #define elf_info_to_howto elf64_x86_64_info_to_howto
4378 #define bfd_elf64_bfd_link_hash_table_create \
4379 elf64_x86_64_link_hash_table_create
4380 #define bfd_elf64_bfd_link_hash_table_free \
4381 elf64_x86_64_link_hash_table_free
4382 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
4383 #define bfd_elf64_bfd_reloc_name_lookup \
4384 elf64_x86_64_reloc_name_lookup
4386 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
4387 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4388 #define elf_backend_check_relocs elf64_x86_64_check_relocs
4389 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4390 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4391 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4392 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4393 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4394 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
4395 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4396 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
4397 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
4398 #define elf_backend_relocate_section elf64_x86_64_relocate_section
4399 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
4400 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
4401 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4402 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
4403 #define elf_backend_object_p elf64_x86_64_elf_object_p
4404 #define bfd_elf64_mkobject elf64_x86_64_mkobject
4406 #define elf_backend_section_from_shdr \
4407 elf64_x86_64_section_from_shdr
4409 #define elf_backend_section_from_bfd_section \
4410 elf64_x86_64_elf_section_from_bfd_section
4411 #define elf_backend_add_symbol_hook \
4412 elf64_x86_64_add_symbol_hook
4413 #define elf_backend_symbol_processing \
4414 elf64_x86_64_symbol_processing
4415 #define elf_backend_common_section_index \
4416 elf64_x86_64_common_section_index
4417 #define elf_backend_common_section \
4418 elf64_x86_64_common_section
4419 #define elf_backend_common_definition \
4420 elf64_x86_64_common_definition
4421 #define elf_backend_merge_symbol \
4422 elf64_x86_64_merge_symbol
4423 #define elf_backend_special_sections \
4424 elf64_x86_64_special_sections
4425 #define elf_backend_additional_program_headers \
4426 elf64_x86_64_additional_program_headers
4427 #define elf_backend_hash_symbol \
4428 elf64_x86_64_hash_symbol
4430 #undef elf_backend_post_process_headers
4431 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4433 #include "elf64-target.h"
4435 /* FreeBSD support. */
4437 #undef TARGET_LITTLE_SYM
4438 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4439 #undef TARGET_LITTLE_NAME
4440 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4443 #define ELF_OSABI ELFOSABI_FREEBSD
4446 #define elf64_bed elf64_x86_64_fbsd_bed
4448 #include "elf64-target.h"