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 /* The x86-64 linker needs to keep track of the number of relocs that
400 it decides to copy as dynamic relocs in check_relocs for each symbol.
401 This is so that it can later discard them if they are found to be
402 unnecessary. We store the information in a field extending the
403 regular ELF linker hash table. */
405 struct elf64_x86_64_dyn_relocs
408 struct elf64_x86_64_dyn_relocs
*next
;
410 /* The input section of the reloc. */
413 /* Total number of relocs copied for the input section. */
416 /* Number of pc-relative relocs copied for the input section. */
417 bfd_size_type pc_count
;
420 /* x86-64 ELF linker hash entry. */
422 struct elf64_x86_64_link_hash_entry
424 struct elf_link_hash_entry elf
;
426 /* Track dynamic relocs copied for this symbol. */
427 struct elf64_x86_64_dyn_relocs
*dyn_relocs
;
429 #define GOT_UNKNOWN 0
433 #define GOT_TLS_GDESC 4
434 #define GOT_TLS_GD_BOTH_P(type) \
435 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
436 #define GOT_TLS_GD_P(type) \
437 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
438 #define GOT_TLS_GDESC_P(type) \
439 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
440 #define GOT_TLS_GD_ANY_P(type) \
441 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
442 unsigned char tls_type
;
444 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
445 starting at the end of the jump table. */
449 #define elf64_x86_64_hash_entry(ent) \
450 ((struct elf64_x86_64_link_hash_entry *)(ent))
452 struct elf64_x86_64_obj_tdata
454 struct elf_obj_tdata root
;
456 /* tls_type for each local got entry. */
457 char *local_got_tls_type
;
459 /* GOTPLT entries for TLS descriptors. */
460 bfd_vma
*local_tlsdesc_gotent
;
463 #define elf64_x86_64_tdata(abfd) \
464 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
466 #define elf64_x86_64_local_got_tls_type(abfd) \
467 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
469 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
470 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
472 #define is_x86_64_elf(bfd) \
473 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
474 && elf_tdata (bfd) != NULL \
475 && elf_object_id (bfd) == X86_64_ELF_TDATA)
478 elf64_x86_64_mkobject (bfd
*abfd
)
480 return bfd_elf_allocate_object (abfd
, sizeof (struct elf64_x86_64_obj_tdata
),
484 /* x86-64 ELF linker hash table. */
486 struct elf64_x86_64_link_hash_table
488 struct elf_link_hash_table elf
;
490 /* Short-cuts to get to dynamic linker sections. */
503 /* The offset into splt of the PLT entry for the TLS descriptor
504 resolver. Special values are 0, if not necessary (or not found
505 to be necessary yet), and -1 if needed but not determined
508 /* The offset into sgot of the GOT entry used by the PLT entry
513 bfd_signed_vma refcount
;
517 /* The amount of space used by the jump slots in the GOT. */
518 bfd_vma sgotplt_jump_table_size
;
520 /* Small local sym to section mapping cache. */
521 struct sym_sec_cache sym_sec
;
523 /* _TLS_MODULE_BASE_ symbol. */
524 struct bfd_link_hash_entry
*tls_module_base
;
526 /* Used by local STT_GNU_IFUNC symbols. */
527 htab_t loc_hash_table
;
528 void *loc_hash_memory
;
531 /* Get the x86-64 ELF linker hash table from a link_info structure. */
533 #define elf64_x86_64_hash_table(p) \
534 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
536 #define elf64_x86_64_compute_jump_table_size(htab) \
537 ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE)
539 /* Create an entry in an x86-64 ELF linker hash table. */
541 static struct bfd_hash_entry
*
542 elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
543 struct bfd_hash_table
*table
,
546 /* Allocate the structure if it has not already been allocated by a
550 entry
= bfd_hash_allocate (table
,
551 sizeof (struct elf64_x86_64_link_hash_entry
));
556 /* Call the allocation method of the superclass. */
557 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
560 struct elf64_x86_64_link_hash_entry
*eh
;
562 eh
= (struct elf64_x86_64_link_hash_entry
*) entry
;
563 eh
->dyn_relocs
= NULL
;
564 eh
->tls_type
= GOT_UNKNOWN
;
565 eh
->tlsdesc_got
= (bfd_vma
) -1;
572 elf64_x86_64_local_hash (int id
, int r_sym
)
574 return ((((id
& 0xff) << 24) | ((id
& 0xff00) << 8))
575 ^ r_sym
^ (id
>> 16));
578 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
579 for local symbol so that we can handle local STT_GNU_IFUNC symbols
580 as global symbol. We reuse indx and dynstr_index for local symbol
581 hash since they aren't used by global symbols in this backend. */
584 elf64_x86_64_local_htab_hash (const void *ptr
)
586 struct elf_link_hash_entry
*h
587 = (struct elf_link_hash_entry
*) ptr
;
588 return elf64_x86_64_local_hash (h
->indx
, h
->dynstr_index
);
591 /* Compare local hash entries. */
594 elf64_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
596 struct elf_link_hash_entry
*h1
597 = (struct elf_link_hash_entry
*) ptr1
;
598 struct elf_link_hash_entry
*h2
599 = (struct elf_link_hash_entry
*) ptr2
;
601 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
604 /* Find and/or create a hash entry for local symbol. */
606 static struct elf_link_hash_entry
*
607 elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table
*htab
,
608 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
611 struct elf64_x86_64_link_hash_entry e
, *ret
;
612 asection
*sec
= abfd
->sections
;
613 hashval_t h
= elf64_x86_64_local_hash (sec
->id
,
614 ELF64_R_SYM (rel
->r_info
));
617 e
.elf
.indx
= sec
->id
;
618 e
.elf
.dynstr_index
= ELF64_R_SYM (rel
->r_info
);
619 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
620 create
? INSERT
: NO_INSERT
);
627 ret
= (struct elf64_x86_64_link_hash_entry
*) *slot
;
631 ret
= (struct elf64_x86_64_link_hash_entry
*)
632 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
633 sizeof (struct elf64_x86_64_link_hash_entry
));
636 memset (ret
, 0, sizeof (*ret
));
637 ret
->elf
.indx
= sec
->id
;
638 ret
->elf
.dynstr_index
= ELF64_R_SYM (rel
->r_info
);
639 ret
->elf
.dynindx
= -1;
640 ret
->elf
.plt
.offset
= (bfd_vma
) -1;
641 ret
->elf
.got
.offset
= (bfd_vma
) -1;
647 /* Create an X86-64 ELF linker hash table. */
649 static struct bfd_link_hash_table
*
650 elf64_x86_64_link_hash_table_create (bfd
*abfd
)
652 struct elf64_x86_64_link_hash_table
*ret
;
653 bfd_size_type amt
= sizeof (struct elf64_x86_64_link_hash_table
);
655 ret
= (struct elf64_x86_64_link_hash_table
*) bfd_malloc (amt
);
659 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
660 elf64_x86_64_link_hash_newfunc
,
661 sizeof (struct elf64_x86_64_link_hash_entry
)))
677 ret
->irelifunc
= NULL
;
678 ret
->sym_sec
.abfd
= NULL
;
679 ret
->tlsdesc_plt
= 0;
680 ret
->tlsdesc_got
= 0;
681 ret
->tls_ld_got
.refcount
= 0;
682 ret
->sgotplt_jump_table_size
= 0;
683 ret
->tls_module_base
= NULL
;
685 ret
->loc_hash_table
= htab_try_create (1024,
686 elf64_x86_64_local_htab_hash
,
687 elf64_x86_64_local_htab_eq
,
689 ret
->loc_hash_memory
= objalloc_create ();
690 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
696 return &ret
->elf
.root
;
699 /* Destroy an X86-64 ELF linker hash table. */
702 elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table
*hash
)
704 struct elf64_x86_64_link_hash_table
*htab
705 = (struct elf64_x86_64_link_hash_table
*) hash
;
707 if (htab
->loc_hash_table
)
708 htab_delete (htab
->loc_hash_table
);
709 if (htab
->loc_hash_memory
)
710 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
711 _bfd_generic_link_hash_table_free (hash
);
714 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
715 shortcuts to them in our hash table. */
718 elf64_x86_64_create_got_section (bfd
*dynobj
, struct bfd_link_info
*info
)
720 struct elf64_x86_64_link_hash_table
*htab
;
722 if (! _bfd_elf_create_got_section (dynobj
, info
))
725 htab
= elf64_x86_64_hash_table (info
);
726 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
727 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
728 if (!htab
->sgot
|| !htab
->sgotplt
)
731 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rela.got",
732 (SEC_ALLOC
| SEC_LOAD
737 if (htab
->srelgot
== NULL
738 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 3))
743 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
744 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
748 elf64_x86_64_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
750 struct elf64_x86_64_link_hash_table
*htab
;
752 htab
= elf64_x86_64_hash_table (info
);
753 if (!htab
->sgot
&& !elf64_x86_64_create_got_section (dynobj
, info
))
756 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
759 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
760 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
761 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
763 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
765 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
766 || (!info
->shared
&& !htab
->srelbss
))
772 /* Copy the extra info we tack onto an elf_link_hash_entry. */
775 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
776 struct elf_link_hash_entry
*dir
,
777 struct elf_link_hash_entry
*ind
)
779 struct elf64_x86_64_link_hash_entry
*edir
, *eind
;
781 edir
= (struct elf64_x86_64_link_hash_entry
*) dir
;
782 eind
= (struct elf64_x86_64_link_hash_entry
*) ind
;
784 if (eind
->dyn_relocs
!= NULL
)
786 if (edir
->dyn_relocs
!= NULL
)
788 struct elf64_x86_64_dyn_relocs
**pp
;
789 struct elf64_x86_64_dyn_relocs
*p
;
791 /* Add reloc counts against the indirect sym to the direct sym
792 list. Merge any entries against the same section. */
793 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
795 struct elf64_x86_64_dyn_relocs
*q
;
797 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
798 if (q
->sec
== p
->sec
)
800 q
->pc_count
+= p
->pc_count
;
801 q
->count
+= p
->count
;
808 *pp
= edir
->dyn_relocs
;
811 edir
->dyn_relocs
= eind
->dyn_relocs
;
812 eind
->dyn_relocs
= NULL
;
815 if (ind
->root
.type
== bfd_link_hash_indirect
816 && dir
->got
.refcount
<= 0)
818 edir
->tls_type
= eind
->tls_type
;
819 eind
->tls_type
= GOT_UNKNOWN
;
822 if (ELIMINATE_COPY_RELOCS
823 && ind
->root
.type
!= bfd_link_hash_indirect
824 && dir
->dynamic_adjusted
)
826 /* If called to transfer flags for a weakdef during processing
827 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
828 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
829 dir
->ref_dynamic
|= ind
->ref_dynamic
;
830 dir
->ref_regular
|= ind
->ref_regular
;
831 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
832 dir
->needs_plt
|= ind
->needs_plt
;
833 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
836 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
840 elf64_x86_64_elf_object_p (bfd
*abfd
)
842 /* Set the right machine number for an x86-64 elf64 file. */
843 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
861 /* Return TRUE if the TLS access code sequence support transition
865 elf64_x86_64_check_tls_transition (bfd
*abfd
, asection
*sec
,
867 Elf_Internal_Shdr
*symtab_hdr
,
868 struct elf_link_hash_entry
**sym_hashes
,
870 const Elf_Internal_Rela
*rel
,
871 const Elf_Internal_Rela
*relend
)
874 unsigned long r_symndx
;
875 struct elf_link_hash_entry
*h
;
878 /* Get the section contents. */
879 if (contents
== NULL
)
881 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
882 contents
= elf_section_data (sec
)->this_hdr
.contents
;
885 /* FIXME: How to better handle error condition? */
886 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
889 /* Cache the section contents for elf_link_input_bfd. */
890 elf_section_data (sec
)->this_hdr
.contents
= contents
;
894 offset
= rel
->r_offset
;
899 if ((rel
+ 1) >= relend
)
902 if (r_type
== R_X86_64_TLSGD
)
904 /* Check transition from GD access model. Only
905 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
906 .word 0x6666; rex64; call __tls_get_addr
907 can transit to different access model. */
909 static x86_64_opcode32 leaq
= { { 0x66, 0x48, 0x8d, 0x3d } },
910 call
= { { 0x66, 0x66, 0x48, 0xe8 } };
912 || (offset
+ 12) > sec
->size
913 || bfd_get_32 (abfd
, contents
+ offset
- 4) != leaq
.i
914 || bfd_get_32 (abfd
, contents
+ offset
+ 4) != call
.i
)
919 /* Check transition from LD access model. Only
920 leaq foo@tlsld(%rip), %rdi;
922 can transit to different access model. */
924 static x86_64_opcode32 ld
= { { 0x48, 0x8d, 0x3d, 0xe8 } };
927 if (offset
< 3 || (offset
+ 9) > sec
->size
)
930 op
.i
= bfd_get_32 (abfd
, contents
+ offset
- 3);
931 op
.c
[3] = bfd_get_8 (abfd
, contents
+ offset
+ 4);
936 r_symndx
= ELF64_R_SYM (rel
[1].r_info
);
937 if (r_symndx
< symtab_hdr
->sh_info
)
940 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
941 /* Use strncmp to check __tls_get_addr since __tls_get_addr
944 && h
->root
.root
.string
!= NULL
945 && (ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
946 || ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
947 && (strncmp (h
->root
.root
.string
,
948 "__tls_get_addr", 14) == 0));
950 case R_X86_64_GOTTPOFF
:
951 /* Check transition from IE access model:
952 movq foo@gottpoff(%rip), %reg
953 addq foo@gottpoff(%rip), %reg
956 if (offset
< 3 || (offset
+ 4) > sec
->size
)
959 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
960 if (val
!= 0x48 && val
!= 0x4c)
963 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
964 if (val
!= 0x8b && val
!= 0x03)
967 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
968 return (val
& 0xc7) == 5;
970 case R_X86_64_GOTPC32_TLSDESC
:
971 /* Check transition from GDesc access model:
972 leaq x@tlsdesc(%rip), %rax
974 Make sure it's a leaq adding rip to a 32-bit offset
975 into any register, although it's probably almost always
978 if (offset
< 3 || (offset
+ 4) > sec
->size
)
981 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
982 if ((val
& 0xfb) != 0x48)
985 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
988 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
989 return (val
& 0xc7) == 0x05;
991 case R_X86_64_TLSDESC_CALL
:
992 /* Check transition from GDesc access model:
993 call *x@tlsdesc(%rax)
995 if (offset
+ 2 <= sec
->size
)
997 /* Make sure that it's a call *x@tlsdesc(%rax). */
998 static x86_64_opcode16 call
= { { 0xff, 0x10 } };
999 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
1009 /* Return TRUE if the TLS access transition is OK or no transition
1010 will be performed. Update R_TYPE if there is a transition. */
1013 elf64_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1014 asection
*sec
, bfd_byte
*contents
,
1015 Elf_Internal_Shdr
*symtab_hdr
,
1016 struct elf_link_hash_entry
**sym_hashes
,
1017 unsigned int *r_type
, int tls_type
,
1018 const Elf_Internal_Rela
*rel
,
1019 const Elf_Internal_Rela
*relend
,
1020 struct elf_link_hash_entry
*h
)
1022 unsigned int from_type
= *r_type
;
1023 unsigned int to_type
= from_type
;
1024 bfd_boolean check
= TRUE
;
1028 case R_X86_64_TLSGD
:
1029 case R_X86_64_GOTPC32_TLSDESC
:
1030 case R_X86_64_TLSDESC_CALL
:
1031 case R_X86_64_GOTTPOFF
:
1035 to_type
= R_X86_64_TPOFF32
;
1037 to_type
= R_X86_64_GOTTPOFF
;
1040 /* When we are called from elf64_x86_64_relocate_section,
1041 CONTENTS isn't NULL and there may be additional transitions
1042 based on TLS_TYPE. */
1043 if (contents
!= NULL
)
1045 unsigned int new_to_type
= to_type
;
1050 && tls_type
== GOT_TLS_IE
)
1051 new_to_type
= R_X86_64_TPOFF32
;
1053 if (to_type
== R_X86_64_TLSGD
1054 || to_type
== R_X86_64_GOTPC32_TLSDESC
1055 || to_type
== R_X86_64_TLSDESC_CALL
)
1057 if (tls_type
== GOT_TLS_IE
)
1058 new_to_type
= R_X86_64_GOTTPOFF
;
1061 /* We checked the transition before when we were called from
1062 elf64_x86_64_check_relocs. We only want to check the new
1063 transition which hasn't been checked before. */
1064 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1065 to_type
= new_to_type
;
1070 case R_X86_64_TLSLD
:
1072 to_type
= R_X86_64_TPOFF32
;
1079 /* Return TRUE if there is no transition. */
1080 if (from_type
== to_type
)
1083 /* Check if the transition can be performed. */
1085 && ! elf64_x86_64_check_tls_transition (abfd
, sec
, contents
,
1086 symtab_hdr
, sym_hashes
,
1087 from_type
, rel
, relend
))
1089 reloc_howto_type
*from
, *to
;
1091 from
= elf64_x86_64_rtype_to_howto (abfd
, from_type
);
1092 to
= elf64_x86_64_rtype_to_howto (abfd
, to_type
);
1094 (*_bfd_error_handler
)
1095 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1096 "in section `%A' failed"),
1097 abfd
, sec
, from
->name
, to
->name
,
1098 h
? h
->root
.root
.string
: "a local symbol",
1099 (unsigned long) rel
->r_offset
);
1100 bfd_set_error (bfd_error_bad_value
);
1108 /* Look through the relocs for a section during the first phase, and
1109 calculate needed space in the global offset table, procedure
1110 linkage table, and dynamic reloc sections. */
1113 elf64_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1115 const Elf_Internal_Rela
*relocs
)
1117 struct elf64_x86_64_link_hash_table
*htab
;
1118 Elf_Internal_Shdr
*symtab_hdr
;
1119 struct elf_link_hash_entry
**sym_hashes
;
1120 const Elf_Internal_Rela
*rel
;
1121 const Elf_Internal_Rela
*rel_end
;
1123 Elf_Internal_Sym
*isymbuf
;
1125 if (info
->relocatable
)
1128 BFD_ASSERT (is_x86_64_elf (abfd
));
1130 htab
= elf64_x86_64_hash_table (info
);
1131 symtab_hdr
= &elf_symtab_hdr (abfd
);
1132 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
1133 sym_hashes
= elf_sym_hashes (abfd
);
1137 rel_end
= relocs
+ sec
->reloc_count
;
1138 for (rel
= relocs
; rel
< rel_end
; rel
++)
1140 unsigned int r_type
;
1141 unsigned long r_symndx
;
1142 struct elf_link_hash_entry
*h
;
1144 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1145 r_type
= ELF64_R_TYPE (rel
->r_info
);
1147 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1149 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1154 if (r_symndx
< symtab_hdr
->sh_info
)
1156 /* A local symbol. */
1157 Elf_Internal_Sym
*isym
;
1159 /* Read this BFD's local symbols. */
1160 if (isymbuf
== NULL
)
1162 if (isymbuf
== NULL
)
1163 isymbuf
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
1164 symtab_hdr
->sh_info
, 0,
1166 if (isymbuf
== NULL
)
1170 /* Check relocation against local STT_GNU_IFUNC symbol. */
1171 isym
= isymbuf
+ r_symndx
;
1172 if (ELF64_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1174 h
= elf64_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1179 /* Fake a STT_GNU_IFUNC symbol. */
1180 h
->type
= STT_GNU_IFUNC
;
1183 h
->forced_local
= 1;
1184 h
->root
.type
= bfd_link_hash_defined
;
1191 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1192 while (h
->root
.type
== bfd_link_hash_indirect
1193 || h
->root
.type
== bfd_link_hash_warning
)
1194 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1199 /* Create the ifunc sections for static executables. If we
1200 never see an indirect function symbol nor we are building
1201 a static executable, those sections will be empty and
1202 won't appear in output. */
1213 case R_X86_64_PLT32
:
1214 case R_X86_64_GOTPCREL
:
1215 case R_X86_64_GOTPCREL64
:
1216 if (htab
->irelifunc
== NULL
&& htab
->iplt
== NULL
)
1218 if (!_bfd_elf_create_ifunc_sections (abfd
, info
))
1223 htab
->irelifunc
= bfd_get_section_by_name (abfd
,
1225 if (!htab
->irelifunc
)
1230 htab
->iplt
= bfd_get_section_by_name (abfd
, ".iplt");
1231 htab
->irelplt
= bfd_get_section_by_name (abfd
,
1233 htab
->igotplt
= bfd_get_section_by_name (abfd
,
1244 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1245 it here if it is defined in a non-shared object. */
1246 if (h
->type
== STT_GNU_IFUNC
1249 /* It is referenced by a non-shared object. */
1252 /* STT_GNU_IFUNC symbol must go through PLT. */
1253 h
->plt
.refcount
+= 1;
1255 /* STT_GNU_IFUNC needs dynamic sections. */
1256 if (htab
->elf
.dynobj
== NULL
)
1257 htab
->elf
.dynobj
= abfd
;
1262 (*_bfd_error_handler
)
1263 (_("%B: relocation %s against STT_GNU_IFUNC "
1264 "symbol `%s' isn't handled by %s"), abfd
,
1265 x86_64_elf_howto_table
[r_type
].name
,
1266 (h
->root
.root
.string
1267 ? h
->root
.root
.string
: "a local symbol"),
1269 bfd_set_error (bfd_error_bad_value
);
1274 h
->pointer_equality_needed
= 1;
1277 struct elf64_x86_64_dyn_relocs
*p
;
1278 struct elf64_x86_64_dyn_relocs
**head
;
1280 /* We must copy these reloc types into the output
1281 file. Create a reloc section in dynobj and
1282 make room for this reloc. */
1285 if (htab
->elf
.dynobj
== NULL
)
1286 htab
->elf
.dynobj
= abfd
;
1288 sreloc
= _bfd_elf_make_dynamic_reloc_section
1289 (sec
, htab
->elf
.dynobj
, 3, abfd
, TRUE
);
1295 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1297 if (p
== NULL
|| p
->sec
!= sec
)
1299 bfd_size_type amt
= sizeof *p
;
1301 p
= ((struct elf64_x86_64_dyn_relocs
*)
1302 bfd_alloc (htab
->elf
.dynobj
, amt
));
1320 if (r_type
!= R_X86_64_PC32
1321 && r_type
!= R_X86_64_PC64
)
1322 h
->pointer_equality_needed
= 1;
1325 case R_X86_64_PLT32
:
1328 case R_X86_64_GOTPCREL
:
1329 case R_X86_64_GOTPCREL64
:
1330 h
->got
.refcount
+= 1;
1331 if (htab
->sgot
== NULL
1332 && !elf64_x86_64_create_got_section (htab
->elf
.dynobj
,
1342 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1343 symtab_hdr
, sym_hashes
,
1344 &r_type
, GOT_UNKNOWN
,
1350 case R_X86_64_TLSLD
:
1351 htab
->tls_ld_got
.refcount
+= 1;
1354 case R_X86_64_TPOFF32
:
1357 (*_bfd_error_handler
)
1358 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1360 x86_64_elf_howto_table
[r_type
].name
,
1361 (h
) ? h
->root
.root
.string
: "a local symbol");
1362 bfd_set_error (bfd_error_bad_value
);
1367 case R_X86_64_GOTTPOFF
:
1369 info
->flags
|= DF_STATIC_TLS
;
1372 case R_X86_64_GOT32
:
1373 case R_X86_64_GOTPCREL
:
1374 case R_X86_64_TLSGD
:
1375 case R_X86_64_GOT64
:
1376 case R_X86_64_GOTPCREL64
:
1377 case R_X86_64_GOTPLT64
:
1378 case R_X86_64_GOTPC32_TLSDESC
:
1379 case R_X86_64_TLSDESC_CALL
:
1380 /* This symbol requires a global offset table entry. */
1382 int tls_type
, old_tls_type
;
1386 default: tls_type
= GOT_NORMAL
; break;
1387 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1388 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1389 case R_X86_64_GOTPC32_TLSDESC
:
1390 case R_X86_64_TLSDESC_CALL
:
1391 tls_type
= GOT_TLS_GDESC
; break;
1396 if (r_type
== R_X86_64_GOTPLT64
)
1398 /* This relocation indicates that we also need
1399 a PLT entry, as this is a function. We don't need
1400 a PLT entry for local symbols. */
1402 h
->plt
.refcount
+= 1;
1404 h
->got
.refcount
+= 1;
1405 old_tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1409 bfd_signed_vma
*local_got_refcounts
;
1411 /* This is a global offset table entry for a local symbol. */
1412 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1413 if (local_got_refcounts
== NULL
)
1417 size
= symtab_hdr
->sh_info
;
1418 size
*= sizeof (bfd_signed_vma
)
1419 + sizeof (bfd_vma
) + sizeof (char);
1420 local_got_refcounts
= ((bfd_signed_vma
*)
1421 bfd_zalloc (abfd
, size
));
1422 if (local_got_refcounts
== NULL
)
1424 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1425 elf64_x86_64_local_tlsdesc_gotent (abfd
)
1426 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1427 elf64_x86_64_local_got_tls_type (abfd
)
1428 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1430 local_got_refcounts
[r_symndx
] += 1;
1432 = elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1435 /* If a TLS symbol is accessed using IE at least once,
1436 there is no point to use dynamic model for it. */
1437 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1438 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1439 || tls_type
!= GOT_TLS_IE
))
1441 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1442 tls_type
= old_tls_type
;
1443 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1444 && GOT_TLS_GD_ANY_P (tls_type
))
1445 tls_type
|= old_tls_type
;
1448 (*_bfd_error_handler
)
1449 (_("%B: '%s' accessed both as normal and thread local symbol"),
1450 abfd
, h
? h
->root
.root
.string
: "<local>");
1455 if (old_tls_type
!= tls_type
)
1458 elf64_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1460 elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1465 case R_X86_64_GOTOFF64
:
1466 case R_X86_64_GOTPC32
:
1467 case R_X86_64_GOTPC64
:
1469 if (htab
->sgot
== NULL
)
1471 if (htab
->elf
.dynobj
== NULL
)
1472 htab
->elf
.dynobj
= abfd
;
1473 if (!elf64_x86_64_create_got_section (htab
->elf
.dynobj
,
1479 case R_X86_64_PLT32
:
1480 /* This symbol requires a procedure linkage table entry. We
1481 actually build the entry in adjust_dynamic_symbol,
1482 because this might be a case of linking PIC code which is
1483 never referenced by a dynamic object, in which case we
1484 don't need to generate a procedure linkage table entry
1487 /* If this is a local symbol, we resolve it directly without
1488 creating a procedure linkage table entry. */
1493 h
->plt
.refcount
+= 1;
1496 case R_X86_64_PLTOFF64
:
1497 /* This tries to form the 'address' of a function relative
1498 to GOT. For global symbols we need a PLT entry. */
1502 h
->plt
.refcount
+= 1;
1510 /* Let's help debug shared library creation. These relocs
1511 cannot be used in shared libs. Don't error out for
1512 sections we don't care about, such as debug sections or
1513 non-constant sections. */
1515 && (sec
->flags
& SEC_ALLOC
) != 0
1516 && (sec
->flags
& SEC_READONLY
) != 0)
1518 (*_bfd_error_handler
)
1519 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1521 x86_64_elf_howto_table
[r_type
].name
,
1522 (h
) ? h
->root
.root
.string
: "a local symbol");
1523 bfd_set_error (bfd_error_bad_value
);
1533 if (h
!= NULL
&& info
->executable
)
1535 /* If this reloc is in a read-only section, we might
1536 need a copy reloc. We can't check reliably at this
1537 stage whether the section is read-only, as input
1538 sections have not yet been mapped to output sections.
1539 Tentatively set the flag for now, and correct in
1540 adjust_dynamic_symbol. */
1543 /* We may need a .plt entry if the function this reloc
1544 refers to is in a shared lib. */
1545 h
->plt
.refcount
+= 1;
1546 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1547 h
->pointer_equality_needed
= 1;
1550 /* If we are creating a shared library, and this is a reloc
1551 against a global symbol, or a non PC relative reloc
1552 against a local symbol, then we need to copy the reloc
1553 into the shared library. However, if we are linking with
1554 -Bsymbolic, we do not need to copy a reloc against a
1555 global symbol which is defined in an object we are
1556 including in the link (i.e., DEF_REGULAR is set). At
1557 this point we have not seen all the input files, so it is
1558 possible that DEF_REGULAR is not set now but will be set
1559 later (it is never cleared). In case of a weak definition,
1560 DEF_REGULAR may be cleared later by a strong definition in
1561 a shared library. We account for that possibility below by
1562 storing information in the relocs_copied field of the hash
1563 table entry. A similar situation occurs when creating
1564 shared libraries and symbol visibility changes render the
1567 If on the other hand, we are creating an executable, we
1568 may need to keep relocations for symbols satisfied by a
1569 dynamic library if we manage to avoid copy relocs for the
1572 && (sec
->flags
& SEC_ALLOC
) != 0
1573 && (! IS_X86_64_PCREL_TYPE (r_type
)
1575 && (! SYMBOLIC_BIND (info
, h
)
1576 || h
->root
.type
== bfd_link_hash_defweak
1577 || !h
->def_regular
))))
1578 || (ELIMINATE_COPY_RELOCS
1580 && (sec
->flags
& SEC_ALLOC
) != 0
1582 && (h
->root
.type
== bfd_link_hash_defweak
1583 || !h
->def_regular
)))
1585 struct elf64_x86_64_dyn_relocs
*p
;
1586 struct elf64_x86_64_dyn_relocs
**head
;
1588 /* We must copy these reloc types into the output file.
1589 Create a reloc section in dynobj and make room for
1593 if (htab
->elf
.dynobj
== NULL
)
1594 htab
->elf
.dynobj
= abfd
;
1596 sreloc
= _bfd_elf_make_dynamic_reloc_section
1597 (sec
, htab
->elf
.dynobj
, 3, abfd
, /*rela?*/ TRUE
);
1603 /* If this is a global symbol, we count the number of
1604 relocations we need for this symbol. */
1607 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1612 /* Track dynamic relocs needed for local syms too.
1613 We really need local syms available to do this
1617 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1622 /* Beware of type punned pointers vs strict aliasing
1624 vpp
= &(elf_section_data (s
)->local_dynrel
);
1625 head
= (struct elf64_x86_64_dyn_relocs
**)vpp
;
1629 if (p
== NULL
|| p
->sec
!= sec
)
1631 bfd_size_type amt
= sizeof *p
;
1633 p
= ((struct elf64_x86_64_dyn_relocs
*)
1634 bfd_alloc (htab
->elf
.dynobj
, amt
));
1645 if (IS_X86_64_PCREL_TYPE (r_type
))
1650 /* This relocation describes the C++ object vtable hierarchy.
1651 Reconstruct it for later use during GC. */
1652 case R_X86_64_GNU_VTINHERIT
:
1653 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1657 /* This relocation describes which C++ vtable entries are actually
1658 used. Record for later use during GC. */
1659 case R_X86_64_GNU_VTENTRY
:
1660 BFD_ASSERT (h
!= NULL
);
1662 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1674 /* Return the section that should be marked against GC for a given
1678 elf64_x86_64_gc_mark_hook (asection
*sec
,
1679 struct bfd_link_info
*info
,
1680 Elf_Internal_Rela
*rel
,
1681 struct elf_link_hash_entry
*h
,
1682 Elf_Internal_Sym
*sym
)
1685 switch (ELF64_R_TYPE (rel
->r_info
))
1687 case R_X86_64_GNU_VTINHERIT
:
1688 case R_X86_64_GNU_VTENTRY
:
1692 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1695 /* Update the got entry reference counts for the section being removed. */
1698 elf64_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1700 const Elf_Internal_Rela
*relocs
)
1702 Elf_Internal_Shdr
*symtab_hdr
;
1703 struct elf_link_hash_entry
**sym_hashes
;
1704 bfd_signed_vma
*local_got_refcounts
;
1705 const Elf_Internal_Rela
*rel
, *relend
;
1707 if (info
->relocatable
)
1710 elf_section_data (sec
)->local_dynrel
= NULL
;
1712 symtab_hdr
= &elf_symtab_hdr (abfd
);
1713 sym_hashes
= elf_sym_hashes (abfd
);
1714 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1716 relend
= relocs
+ sec
->reloc_count
;
1717 for (rel
= relocs
; rel
< relend
; rel
++)
1719 unsigned long r_symndx
;
1720 unsigned int r_type
;
1721 struct elf_link_hash_entry
*h
= NULL
;
1723 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1724 if (r_symndx
>= symtab_hdr
->sh_info
)
1726 struct elf64_x86_64_link_hash_entry
*eh
;
1727 struct elf64_x86_64_dyn_relocs
**pp
;
1728 struct elf64_x86_64_dyn_relocs
*p
;
1730 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1731 while (h
->root
.type
== bfd_link_hash_indirect
1732 || h
->root
.type
== bfd_link_hash_warning
)
1733 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1734 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1736 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1739 /* Everything must go for SEC. */
1745 r_type
= ELF64_R_TYPE (rel
->r_info
);
1746 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1747 symtab_hdr
, sym_hashes
,
1748 &r_type
, GOT_UNKNOWN
,
1754 case R_X86_64_TLSLD
:
1755 if (elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
> 0)
1756 elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
-= 1;
1759 case R_X86_64_TLSGD
:
1760 case R_X86_64_GOTPC32_TLSDESC
:
1761 case R_X86_64_TLSDESC_CALL
:
1762 case R_X86_64_GOTTPOFF
:
1763 case R_X86_64_GOT32
:
1764 case R_X86_64_GOTPCREL
:
1765 case R_X86_64_GOT64
:
1766 case R_X86_64_GOTPCREL64
:
1767 case R_X86_64_GOTPLT64
:
1770 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1771 h
->plt
.refcount
-= 1;
1772 if (h
->got
.refcount
> 0)
1773 h
->got
.refcount
-= 1;
1775 else if (local_got_refcounts
!= NULL
)
1777 if (local_got_refcounts
[r_symndx
] > 0)
1778 local_got_refcounts
[r_symndx
] -= 1;
1795 case R_X86_64_PLT32
:
1796 case R_X86_64_PLTOFF64
:
1799 if (h
->plt
.refcount
> 0)
1800 h
->plt
.refcount
-= 1;
1812 /* Adjust a symbol defined by a dynamic object and referenced by a
1813 regular object. The current definition is in some section of the
1814 dynamic object, but we're not including those sections. We have to
1815 change the definition to something the rest of the link can
1819 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1820 struct elf_link_hash_entry
*h
)
1822 struct elf64_x86_64_link_hash_table
*htab
;
1825 /* STT_GNU_IFUNC symbol must go through PLT. */
1826 if (h
->type
== STT_GNU_IFUNC
)
1828 if (h
->plt
.refcount
<= 0)
1830 h
->plt
.offset
= (bfd_vma
) -1;
1836 /* If this is a function, put it in the procedure linkage table. We
1837 will fill in the contents of the procedure linkage table later,
1838 when we know the address of the .got section. */
1839 if (h
->type
== STT_FUNC
1842 if (h
->plt
.refcount
<= 0
1843 || SYMBOL_CALLS_LOCAL (info
, h
)
1844 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1845 && h
->root
.type
== bfd_link_hash_undefweak
))
1847 /* This case can occur if we saw a PLT32 reloc in an input
1848 file, but the symbol was never referred to by a dynamic
1849 object, or if all references were garbage collected. In
1850 such a case, we don't actually need to build a procedure
1851 linkage table, and we can just do a PC32 reloc instead. */
1852 h
->plt
.offset
= (bfd_vma
) -1;
1859 /* It's possible that we incorrectly decided a .plt reloc was
1860 needed for an R_X86_64_PC32 reloc to a non-function sym in
1861 check_relocs. We can't decide accurately between function and
1862 non-function syms in check-relocs; Objects loaded later in
1863 the link may change h->type. So fix it now. */
1864 h
->plt
.offset
= (bfd_vma
) -1;
1866 /* If this is a weak symbol, and there is a real definition, the
1867 processor independent code will have arranged for us to see the
1868 real definition first, and we can just use the same value. */
1869 if (h
->u
.weakdef
!= NULL
)
1871 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1872 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1873 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1874 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1875 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1876 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1880 /* This is a reference to a symbol defined by a dynamic object which
1881 is not a function. */
1883 /* If we are creating a shared library, we must presume that the
1884 only references to the symbol are via the global offset table.
1885 For such cases we need not do anything here; the relocations will
1886 be handled correctly by relocate_section. */
1890 /* If there are no references to this symbol that do not use the
1891 GOT, we don't need to generate a copy reloc. */
1892 if (!h
->non_got_ref
)
1895 /* If -z nocopyreloc was given, we won't generate them either. */
1896 if (info
->nocopyreloc
)
1902 if (ELIMINATE_COPY_RELOCS
)
1904 struct elf64_x86_64_link_hash_entry
* eh
;
1905 struct elf64_x86_64_dyn_relocs
*p
;
1907 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1908 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1910 s
= p
->sec
->output_section
;
1911 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1915 /* If we didn't find any dynamic relocs in read-only sections, then
1916 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1926 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1927 h
->root
.root
.string
);
1931 /* We must allocate the symbol in our .dynbss section, which will
1932 become part of the .bss section of the executable. There will be
1933 an entry for this symbol in the .dynsym section. The dynamic
1934 object will contain position independent code, so all references
1935 from the dynamic object to this symbol will go through the global
1936 offset table. The dynamic linker will use the .dynsym entry to
1937 determine the address it must put in the global offset table, so
1938 both the dynamic object and the regular object will refer to the
1939 same memory location for the variable. */
1941 htab
= elf64_x86_64_hash_table (info
);
1943 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1944 to copy the initial value out of the dynamic object and into the
1945 runtime process image. */
1946 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1948 htab
->srelbss
->size
+= sizeof (Elf64_External_Rela
);
1954 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1957 /* Allocate space in .plt, .got and associated reloc sections for
1961 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1963 struct bfd_link_info
*info
;
1964 struct elf64_x86_64_link_hash_table
*htab
;
1965 struct elf64_x86_64_link_hash_entry
*eh
;
1966 struct elf64_x86_64_dyn_relocs
*p
;
1968 if (h
->root
.type
== bfd_link_hash_indirect
)
1971 if (h
->root
.type
== bfd_link_hash_warning
)
1972 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1973 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1975 info
= (struct bfd_link_info
*) inf
;
1976 htab
= elf64_x86_64_hash_table (info
);
1978 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1979 here if it is defined and referenced in a non-shared object. */
1980 if (h
->type
== STT_GNU_IFUNC
1983 asection
*plt
, *gotplt
, *relplt
;
1985 /* Return and discard space for dynamic relocations against it if
1986 it is never referenced in a non-shared object. */
1987 if (!h
->ref_regular
)
1989 if (h
->plt
.refcount
> 0
1990 || h
->got
.refcount
> 0)
1992 h
->got
.offset
= (bfd_vma
) -1;
1993 eh
->dyn_relocs
= NULL
;
1997 /* When building a static executable, use .iplt, .igot.plt and
1998 .rela.iplt sections for STT_GNU_IFUNC symbols. */
1999 if (htab
->splt
!= NULL
)
2002 gotplt
= htab
->sgotplt
;
2003 relplt
= htab
->srelplt
;
2005 /* If this is the first .plt entry, make room for the special
2008 plt
->size
+= PLT_ENTRY_SIZE
;
2013 gotplt
= htab
->igotplt
;
2014 relplt
= htab
->irelplt
;
2017 /* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
2018 the original value for R_X86_64_IRELATIVE. */
2019 h
->plt
.offset
= plt
->size
;
2021 /* Make room for this entry in the .plt/.iplt section. */
2022 plt
->size
+= PLT_ENTRY_SIZE
;
2024 /* We also need to make an entry in the .got.plt/.got.iplt
2025 section, which will be placed in the .got section by the
2027 gotplt
->size
+= GOT_ENTRY_SIZE
;
2029 /* We also need to make an entry in the .rela.plt/.rela.iplt
2031 relplt
->size
+= sizeof (Elf64_External_Rela
);
2032 relplt
->reloc_count
++;
2034 /* We need dynamic relocation for STT_GNU_IFUNC symbol only
2035 when there is a non-GOT reference in a shared object. */
2038 eh
->dyn_relocs
= NULL
;
2040 /* Finally, allocate space. */
2041 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2042 htab
->irelifunc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2044 /* For STT_GNU_IFUNC symbol, .got.plt has the real function
2045 addres and .got has the PLT entry adddress. We will load
2046 the GOT entry with the PLT entry in finish_dynamic_symbol if
2047 it is used. For branch, it uses .got.plt. For symbol value,
2048 1. Use .got.plt in a shared object if it is forced local or
2050 2. Use .got.plt in a non-shared object if pointer equality
2052 3. Use .got.plt if .got isn't used.
2053 4. Otherwise use .got so that it can be shared among different
2054 objects at run-time.
2055 We only need to relocate .got entry in shared object. */
2057 && (h
->dynindx
== -1
2058 || h
->forced_local
))
2060 && !h
->pointer_equality_needed
)
2061 || htab
->sgot
== NULL
)
2064 h
->got
.offset
= (bfd_vma
) -1;
2068 h
->got
.offset
= htab
->sgot
->size
;
2069 htab
->sgot
->size
+= GOT_ENTRY_SIZE
;
2071 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2076 else if (htab
->elf
.dynamic_sections_created
2077 && h
->plt
.refcount
> 0)
2079 /* Make sure this symbol is output as a dynamic symbol.
2080 Undefined weak syms won't yet be marked as dynamic. */
2081 if (h
->dynindx
== -1
2082 && !h
->forced_local
)
2084 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2089 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2091 asection
*s
= htab
->splt
;
2093 /* If this is the first .plt entry, make room for the special
2096 s
->size
+= PLT_ENTRY_SIZE
;
2098 h
->plt
.offset
= s
->size
;
2100 /* If this symbol is not defined in a regular file, and we are
2101 not generating a shared library, then set the symbol to this
2102 location in the .plt. This is required to make function
2103 pointers compare as equal between the normal executable and
2104 the shared library. */
2108 h
->root
.u
.def
.section
= s
;
2109 h
->root
.u
.def
.value
= h
->plt
.offset
;
2112 /* Make room for this entry. */
2113 s
->size
+= PLT_ENTRY_SIZE
;
2115 /* We also need to make an entry in the .got.plt section, which
2116 will be placed in the .got section by the linker script. */
2117 htab
->sgotplt
->size
+= GOT_ENTRY_SIZE
;
2119 /* We also need to make an entry in the .rela.plt section. */
2120 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
2121 htab
->srelplt
->reloc_count
++;
2125 h
->plt
.offset
= (bfd_vma
) -1;
2131 h
->plt
.offset
= (bfd_vma
) -1;
2135 eh
->tlsdesc_got
= (bfd_vma
) -1;
2137 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2138 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2139 if (h
->got
.refcount
> 0
2142 && elf64_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2144 h
->got
.offset
= (bfd_vma
) -1;
2146 else if (h
->got
.refcount
> 0)
2150 int tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
2152 /* Make sure this symbol is output as a dynamic symbol.
2153 Undefined weak syms won't yet be marked as dynamic. */
2154 if (h
->dynindx
== -1
2155 && !h
->forced_local
)
2157 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2161 if (GOT_TLS_GDESC_P (tls_type
))
2163 eh
->tlsdesc_got
= htab
->sgotplt
->size
2164 - elf64_x86_64_compute_jump_table_size (htab
);
2165 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2166 h
->got
.offset
= (bfd_vma
) -2;
2168 if (! GOT_TLS_GDESC_P (tls_type
)
2169 || GOT_TLS_GD_P (tls_type
))
2172 h
->got
.offset
= s
->size
;
2173 s
->size
+= GOT_ENTRY_SIZE
;
2174 if (GOT_TLS_GD_P (tls_type
))
2175 s
->size
+= GOT_ENTRY_SIZE
;
2177 dyn
= htab
->elf
.dynamic_sections_created
;
2178 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2180 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2181 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2182 || tls_type
== GOT_TLS_IE
)
2183 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2184 else if (GOT_TLS_GD_P (tls_type
))
2185 htab
->srelgot
->size
+= 2 * sizeof (Elf64_External_Rela
);
2186 else if (! GOT_TLS_GDESC_P (tls_type
)
2187 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2188 || h
->root
.type
!= bfd_link_hash_undefweak
)
2190 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2191 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2192 if (GOT_TLS_GDESC_P (tls_type
))
2194 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
2195 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2199 h
->got
.offset
= (bfd_vma
) -1;
2201 if (eh
->dyn_relocs
== NULL
)
2204 /* In the shared -Bsymbolic case, discard space allocated for
2205 dynamic pc-relative relocs against symbols which turn out to be
2206 defined in regular objects. For the normal shared case, discard
2207 space for pc-relative relocs that have become local due to symbol
2208 visibility changes. */
2212 /* Relocs that use pc_count are those that appear on a call
2213 insn, or certain REL relocs that can generated via assembly.
2214 We want calls to protected symbols to resolve directly to the
2215 function rather than going via the plt. If people want
2216 function pointer comparisons to work as expected then they
2217 should avoid writing weird assembly. */
2218 if (SYMBOL_CALLS_LOCAL (info
, h
))
2220 struct elf64_x86_64_dyn_relocs
**pp
;
2222 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2224 p
->count
-= p
->pc_count
;
2233 /* Also discard relocs on undefined weak syms with non-default
2235 if (eh
->dyn_relocs
!= NULL
2236 && h
->root
.type
== bfd_link_hash_undefweak
)
2238 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2239 eh
->dyn_relocs
= NULL
;
2241 /* Make sure undefined weak symbols are output as a dynamic
2243 else if (h
->dynindx
== -1
2244 && ! h
->forced_local
2245 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2250 else if (ELIMINATE_COPY_RELOCS
)
2252 /* For the non-shared case, discard space for relocs against
2253 symbols which turn out to need copy relocs or are not
2259 || (htab
->elf
.dynamic_sections_created
2260 && (h
->root
.type
== bfd_link_hash_undefweak
2261 || h
->root
.type
== bfd_link_hash_undefined
))))
2263 /* Make sure this symbol is output as a dynamic symbol.
2264 Undefined weak syms won't yet be marked as dynamic. */
2265 if (h
->dynindx
== -1
2266 && ! h
->forced_local
2267 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2270 /* If that succeeded, we know we'll be keeping all the
2272 if (h
->dynindx
!= -1)
2276 eh
->dyn_relocs
= NULL
;
2281 /* Finally, allocate space. */
2282 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2286 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2288 BFD_ASSERT (sreloc
!= NULL
);
2290 sreloc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2296 /* Allocate space in .plt, .got and associated reloc sections for
2297 local dynamic relocs. */
2300 elf64_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2302 struct elf_link_hash_entry
*h
2303 = (struct elf_link_hash_entry
*) *slot
;
2305 if (h
->type
!= STT_GNU_IFUNC
2309 || h
->root
.type
!= bfd_link_hash_defined
)
2312 return elf64_x86_64_allocate_dynrelocs (h
, inf
);
2315 /* Find any dynamic relocs that apply to read-only sections. */
2318 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2320 struct elf64_x86_64_link_hash_entry
*eh
;
2321 struct elf64_x86_64_dyn_relocs
*p
;
2323 if (h
->root
.type
== bfd_link_hash_warning
)
2324 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2326 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
2327 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2329 asection
*s
= p
->sec
->output_section
;
2331 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2333 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2335 info
->flags
|= DF_TEXTREL
;
2337 /* Not an error, just cut short the traversal. */
2344 /* Set the sizes of the dynamic sections. */
2347 elf64_x86_64_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2348 struct bfd_link_info
*info
)
2350 struct elf64_x86_64_link_hash_table
*htab
;
2356 htab
= elf64_x86_64_hash_table (info
);
2357 dynobj
= htab
->elf
.dynobj
;
2361 if (htab
->elf
.dynamic_sections_created
)
2363 /* Set the contents of the .interp section to the interpreter. */
2364 if (info
->executable
)
2366 s
= bfd_get_section_by_name (dynobj
, ".interp");
2369 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
2370 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
2374 /* Set up .got offsets for local syms, and space for local dynamic
2376 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2378 bfd_signed_vma
*local_got
;
2379 bfd_signed_vma
*end_local_got
;
2380 char *local_tls_type
;
2381 bfd_vma
*local_tlsdesc_gotent
;
2382 bfd_size_type locsymcount
;
2383 Elf_Internal_Shdr
*symtab_hdr
;
2386 if (! is_x86_64_elf (ibfd
))
2389 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2391 struct elf64_x86_64_dyn_relocs
*p
;
2393 for (p
= (struct elf64_x86_64_dyn_relocs
*)
2394 (elf_section_data (s
)->local_dynrel
);
2398 if (!bfd_is_abs_section (p
->sec
)
2399 && bfd_is_abs_section (p
->sec
->output_section
))
2401 /* Input section has been discarded, either because
2402 it is a copy of a linkonce section or due to
2403 linker script /DISCARD/, so we'll be discarding
2406 else if (p
->count
!= 0)
2408 srel
= elf_section_data (p
->sec
)->sreloc
;
2409 srel
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2410 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2411 info
->flags
|= DF_TEXTREL
;
2416 local_got
= elf_local_got_refcounts (ibfd
);
2420 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2421 locsymcount
= symtab_hdr
->sh_info
;
2422 end_local_got
= local_got
+ locsymcount
;
2423 local_tls_type
= elf64_x86_64_local_got_tls_type (ibfd
);
2424 local_tlsdesc_gotent
= elf64_x86_64_local_tlsdesc_gotent (ibfd
);
2426 srel
= htab
->srelgot
;
2427 for (; local_got
< end_local_got
;
2428 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2430 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2433 if (GOT_TLS_GDESC_P (*local_tls_type
))
2435 *local_tlsdesc_gotent
= htab
->sgotplt
->size
2436 - elf64_x86_64_compute_jump_table_size (htab
);
2437 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2438 *local_got
= (bfd_vma
) -2;
2440 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2441 || GOT_TLS_GD_P (*local_tls_type
))
2443 *local_got
= s
->size
;
2444 s
->size
+= GOT_ENTRY_SIZE
;
2445 if (GOT_TLS_GD_P (*local_tls_type
))
2446 s
->size
+= GOT_ENTRY_SIZE
;
2449 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2450 || *local_tls_type
== GOT_TLS_IE
)
2452 if (GOT_TLS_GDESC_P (*local_tls_type
))
2454 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
2455 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2457 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2458 || GOT_TLS_GD_P (*local_tls_type
))
2459 srel
->size
+= sizeof (Elf64_External_Rela
);
2463 *local_got
= (bfd_vma
) -1;
2467 if (htab
->tls_ld_got
.refcount
> 0)
2469 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2471 htab
->tls_ld_got
.offset
= htab
->sgot
->size
;
2472 htab
->sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2473 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2476 htab
->tls_ld_got
.offset
= -1;
2478 /* Allocate global sym .plt and .got entries, and space for global
2479 sym dynamic relocs. */
2480 elf_link_hash_traverse (&htab
->elf
, elf64_x86_64_allocate_dynrelocs
,
2483 /* Allocate .plt and .got entries, and space for local symbols. */
2484 htab_traverse (htab
->loc_hash_table
,
2485 elf64_x86_64_allocate_local_dynrelocs
,
2488 /* For every jump slot reserved in the sgotplt, reloc_count is
2489 incremented. However, when we reserve space for TLS descriptors,
2490 it's not incremented, so in order to compute the space reserved
2491 for them, it suffices to multiply the reloc count by the jump
2494 htab
->sgotplt_jump_table_size
2495 = elf64_x86_64_compute_jump_table_size (htab
);
2497 if (htab
->tlsdesc_plt
)
2499 /* If we're not using lazy TLS relocations, don't generate the
2500 PLT and GOT entries they require. */
2501 if ((info
->flags
& DF_BIND_NOW
))
2502 htab
->tlsdesc_plt
= 0;
2505 htab
->tlsdesc_got
= htab
->sgot
->size
;
2506 htab
->sgot
->size
+= GOT_ENTRY_SIZE
;
2507 /* Reserve room for the initial entry.
2508 FIXME: we could probably do away with it in this case. */
2509 if (htab
->splt
->size
== 0)
2510 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
2511 htab
->tlsdesc_plt
= htab
->splt
->size
;
2512 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
2516 /* We now have determined the sizes of the various dynamic sections.
2517 Allocate memory for them. */
2519 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2521 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2526 || s
== htab
->sgotplt
2528 || s
== htab
->igotplt
2529 || s
== htab
->sdynbss
)
2531 /* Strip this section if we don't need it; see the
2534 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2536 if (s
->size
!= 0 && s
!= htab
->srelplt
)
2539 /* We use the reloc_count field as a counter if we need
2540 to copy relocs into the output file. */
2541 if (s
!= htab
->srelplt
)
2546 /* It's not one of our sections, so don't allocate space. */
2552 /* If we don't need this section, strip it from the
2553 output file. This is mostly to handle .rela.bss and
2554 .rela.plt. We must create both sections in
2555 create_dynamic_sections, because they must be created
2556 before the linker maps input sections to output
2557 sections. The linker does that before
2558 adjust_dynamic_symbol is called, and it is that
2559 function which decides whether anything needs to go
2560 into these sections. */
2562 s
->flags
|= SEC_EXCLUDE
;
2566 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2569 /* Allocate memory for the section contents. We use bfd_zalloc
2570 here in case unused entries are not reclaimed before the
2571 section's contents are written out. This should not happen,
2572 but this way if it does, we get a R_X86_64_NONE reloc instead
2574 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2575 if (s
->contents
== NULL
)
2579 if (htab
->elf
.dynamic_sections_created
)
2581 /* Add some entries to the .dynamic section. We fill in the
2582 values later, in elf64_x86_64_finish_dynamic_sections, but we
2583 must add the entries now so that we get the correct size for
2584 the .dynamic section. The DT_DEBUG entry is filled in by the
2585 dynamic linker and used by the debugger. */
2586 #define add_dynamic_entry(TAG, VAL) \
2587 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2589 if (info
->executable
)
2591 if (!add_dynamic_entry (DT_DEBUG
, 0))
2595 if (htab
->splt
->size
!= 0)
2597 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2598 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2599 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2600 || !add_dynamic_entry (DT_JMPREL
, 0))
2603 if (htab
->tlsdesc_plt
2604 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2605 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2611 if (!add_dynamic_entry (DT_RELA
, 0)
2612 || !add_dynamic_entry (DT_RELASZ
, 0)
2613 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf64_External_Rela
)))
2616 /* If any dynamic relocs apply to a read-only section,
2617 then we need a DT_TEXTREL entry. */
2618 if ((info
->flags
& DF_TEXTREL
) == 0)
2619 elf_link_hash_traverse (&htab
->elf
,
2620 elf64_x86_64_readonly_dynrelocs
,
2623 if ((info
->flags
& DF_TEXTREL
) != 0)
2625 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2630 #undef add_dynamic_entry
2636 elf64_x86_64_always_size_sections (bfd
*output_bfd
,
2637 struct bfd_link_info
*info
)
2639 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2643 struct elf_link_hash_entry
*tlsbase
;
2645 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2646 "_TLS_MODULE_BASE_",
2647 FALSE
, FALSE
, FALSE
);
2649 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2651 struct bfd_link_hash_entry
*bh
= NULL
;
2652 const struct elf_backend_data
*bed
2653 = get_elf_backend_data (output_bfd
);
2655 if (!(_bfd_generic_link_add_one_symbol
2656 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2657 tls_sec
, 0, NULL
, FALSE
,
2658 bed
->collect
, &bh
)))
2661 elf64_x86_64_hash_table (info
)->tls_module_base
= bh
;
2663 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2664 tlsbase
->def_regular
= 1;
2665 tlsbase
->other
= STV_HIDDEN
;
2666 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2673 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2674 executables. Rather than setting it to the beginning of the TLS
2675 section, we have to set it to the end. This function may be called
2676 multiple times, it is idempotent. */
2679 elf64_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2681 struct bfd_link_hash_entry
*base
;
2683 if (!info
->executable
)
2686 base
= elf64_x86_64_hash_table (info
)->tls_module_base
;
2691 base
->u
.def
.value
= elf_hash_table (info
)->tls_size
;
2694 /* Return the base VMA address which should be subtracted from real addresses
2695 when resolving @dtpoff relocation.
2696 This is PT_TLS segment p_vaddr. */
2699 elf64_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2701 /* If tls_sec is NULL, we should have signalled an error already. */
2702 if (elf_hash_table (info
)->tls_sec
== NULL
)
2704 return elf_hash_table (info
)->tls_sec
->vma
;
2707 /* Return the relocation value for @tpoff relocation
2708 if STT_TLS virtual address is ADDRESS. */
2711 elf64_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2713 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2715 /* If tls_segment is NULL, we should have signalled an error already. */
2716 if (htab
->tls_sec
== NULL
)
2718 return address
- htab
->tls_size
- htab
->tls_sec
->vma
;
2721 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2725 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2727 /* Opcode Instruction
2730 0x0f 0x8x conditional jump */
2732 && (contents
[offset
- 1] == 0xe8
2733 || contents
[offset
- 1] == 0xe9))
2735 && contents
[offset
- 2] == 0x0f
2736 && (contents
[offset
- 1] & 0xf0) == 0x80));
2739 /* Relocate an x86_64 ELF section. */
2742 elf64_x86_64_relocate_section (bfd
*output_bfd
, struct bfd_link_info
*info
,
2743 bfd
*input_bfd
, asection
*input_section
,
2744 bfd_byte
*contents
, Elf_Internal_Rela
*relocs
,
2745 Elf_Internal_Sym
*local_syms
,
2746 asection
**local_sections
)
2748 struct elf64_x86_64_link_hash_table
*htab
;
2749 Elf_Internal_Shdr
*symtab_hdr
;
2750 struct elf_link_hash_entry
**sym_hashes
;
2751 bfd_vma
*local_got_offsets
;
2752 bfd_vma
*local_tlsdesc_gotents
;
2753 Elf_Internal_Rela
*rel
;
2754 Elf_Internal_Rela
*relend
;
2756 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2758 htab
= elf64_x86_64_hash_table (info
);
2759 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2760 sym_hashes
= elf_sym_hashes (input_bfd
);
2761 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2762 local_tlsdesc_gotents
= elf64_x86_64_local_tlsdesc_gotent (input_bfd
);
2764 elf64_x86_64_set_tls_module_base (info
);
2767 relend
= relocs
+ input_section
->reloc_count
;
2768 for (; rel
< relend
; rel
++)
2770 unsigned int r_type
;
2771 reloc_howto_type
*howto
;
2772 unsigned long r_symndx
;
2773 struct elf_link_hash_entry
*h
;
2774 Elf_Internal_Sym
*sym
;
2776 bfd_vma off
, offplt
;
2778 bfd_boolean unresolved_reloc
;
2779 bfd_reloc_status_type r
;
2783 r_type
= ELF64_R_TYPE (rel
->r_info
);
2784 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2785 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2788 if (r_type
>= R_X86_64_max
)
2790 bfd_set_error (bfd_error_bad_value
);
2794 howto
= x86_64_elf_howto_table
+ r_type
;
2795 r_symndx
= ELF64_R_SYM (rel
->r_info
);
2799 unresolved_reloc
= FALSE
;
2800 if (r_symndx
< symtab_hdr
->sh_info
)
2802 sym
= local_syms
+ r_symndx
;
2803 sec
= local_sections
[r_symndx
];
2805 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2808 /* Relocate against local STT_GNU_IFUNC symbol. */
2809 if (ELF64_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2811 h
= elf64_x86_64_get_local_sym_hash (htab
, input_bfd
,
2816 /* Set STT_GNU_IFUNC symbol value. */
2817 h
->root
.u
.def
.value
= sym
->st_value
;
2818 h
->root
.u
.def
.section
= sec
;
2825 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2826 r_symndx
, symtab_hdr
, sym_hashes
,
2828 unresolved_reloc
, warned
);
2831 if (sec
!= NULL
&& elf_discarded_section (sec
))
2833 /* For relocs against symbols from removed linkonce sections,
2834 or sections discarded by a linker script, we just want the
2835 section contents zeroed. Avoid any special processing. */
2836 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2842 if (info
->relocatable
)
2845 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2846 it here if it is defined in a non-shared object. */
2848 && h
->type
== STT_GNU_IFUNC
2854 if ((input_section
->flags
& SEC_ALLOC
) == 0
2855 || h
->plt
.offset
== (bfd_vma
) -1)
2858 /* STT_GNU_IFUNC symbol must go through PLT. */
2859 plt
= htab
->splt
? htab
->splt
: htab
->iplt
;
2860 relocation
= (plt
->output_section
->vma
2861 + plt
->output_offset
+ h
->plt
.offset
);
2866 (*_bfd_error_handler
)
2867 (_("%B: relocation %s against STT_GNU_IFUNC "
2868 "symbol `%s' isn't handled by %s"), input_bfd
,
2869 x86_64_elf_howto_table
[r_type
].name
,
2870 (h
->root
.root
.string
2871 ? h
->root
.root
.string
: "a local symbol"),
2873 bfd_set_error (bfd_error_bad_value
);
2882 if (rel
->r_addend
!= 0)
2884 (*_bfd_error_handler
)
2885 (_("%B: relocation %s against STT_GNU_IFUNC "
2886 "symbol `%s' has non-zero addend: %d"),
2887 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2888 (h
->root
.root
.string
2889 ? h
->root
.root
.string
: "a local symbol"),
2891 bfd_set_error (bfd_error_bad_value
);
2895 /* Generate dynamic relcoation only when there is a
2896 non-GOF reference in a shared object. */
2897 if (info
->shared
&& h
->non_got_ref
)
2899 Elf_Internal_Rela outrel
;
2903 /* Need a dynamic relocation to get the real function
2905 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2909 if (outrel
.r_offset
== (bfd_vma
) -1
2910 || outrel
.r_offset
== (bfd_vma
) -2)
2913 outrel
.r_offset
+= (input_section
->output_section
->vma
2914 + input_section
->output_offset
);
2916 if (h
->dynindx
== -1
2919 /* This symbol is resolved locally. */
2920 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_IRELATIVE
);
2921 outrel
.r_addend
= (h
->root
.u
.def
.value
2922 + h
->root
.u
.def
.section
->output_section
->vma
2923 + h
->root
.u
.def
.section
->output_offset
);
2927 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
2928 outrel
.r_addend
= 0;
2931 sreloc
= htab
->irelifunc
;
2932 loc
= sreloc
->contents
;
2933 loc
+= (sreloc
->reloc_count
++
2934 * sizeof (Elf64_External_Rela
));
2935 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2937 /* If this reloc is against an external symbol, we
2938 do not want to fiddle with the addend. Otherwise,
2939 we need to include the symbol value so that it
2940 becomes an addend for the dynamic reloc. For an
2941 internal symbol, we have updated addend. */
2948 case R_X86_64_PLT32
:
2951 case R_X86_64_GOTPCREL
:
2952 case R_X86_64_GOTPCREL64
:
2953 base_got
= htab
->sgot
;
2954 off
= h
->got
.offset
;
2956 if (base_got
== NULL
)
2959 if (off
== (bfd_vma
) -1)
2961 /* We can't use h->got.offset here to save state, or
2962 even just remember the offset, as finish_dynamic_symbol
2963 would use that as offset into .got. */
2965 if (htab
->splt
!= NULL
)
2967 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2968 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2969 base_got
= htab
->sgotplt
;
2973 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
2974 off
= plt_index
* GOT_ENTRY_SIZE
;
2975 base_got
= htab
->igotplt
;
2978 if (h
->dynindx
== -1
2982 /* This references the local defitionion. We must
2983 initialize this entry in the global offset table.
2984 Since the offset must always be a multiple of 8,
2985 we use the least significant bit to record
2986 whether we have initialized it already.
2988 When doing a dynamic link, we create a .rela.got
2989 relocation entry to initialize the value. This
2990 is done in the finish_dynamic_symbol routine. */
2995 bfd_put_64 (output_bfd
, relocation
,
2996 base_got
->contents
+ off
);
2997 /* Note that this is harmless for the GOTPLT64
2998 case, as -1 | 1 still is -1. */
3004 relocation
= (base_got
->output_section
->vma
3005 + base_got
->output_offset
+ off
);
3007 if (r_type
!= R_X86_64_GOTPCREL
3008 && r_type
!= R_X86_64_GOTPCREL64
)
3011 if (htab
->splt
!= NULL
)
3012 gotplt
= htab
->sgotplt
;
3014 gotplt
= htab
->igotplt
;
3015 relocation
-= (gotplt
->output_section
->vma
3016 - gotplt
->output_offset
);
3023 /* When generating a shared object, the relocations handled here are
3024 copied into the output file to be resolved at run time. */
3027 case R_X86_64_GOT32
:
3028 case R_X86_64_GOT64
:
3029 /* Relocation is to the entry for this symbol in the global
3031 case R_X86_64_GOTPCREL
:
3032 case R_X86_64_GOTPCREL64
:
3033 /* Use global offset table entry as symbol value. */
3034 case R_X86_64_GOTPLT64
:
3035 /* This is the same as GOT64 for relocation purposes, but
3036 indicates the existence of a PLT entry. The difficulty is,
3037 that we must calculate the GOT slot offset from the PLT
3038 offset, if this symbol got a PLT entry (it was global).
3039 Additionally if it's computed from the PLT entry, then that
3040 GOT offset is relative to .got.plt, not to .got. */
3041 base_got
= htab
->sgot
;
3043 if (htab
->sgot
== NULL
)
3050 off
= h
->got
.offset
;
3052 && h
->plt
.offset
!= (bfd_vma
)-1
3053 && off
== (bfd_vma
)-1)
3055 /* We can't use h->got.offset here to save
3056 state, or even just remember the offset, as
3057 finish_dynamic_symbol would use that as offset into
3059 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3060 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3061 base_got
= htab
->sgotplt
;
3064 dyn
= htab
->elf
.dynamic_sections_created
;
3066 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3068 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3069 || (ELF_ST_VISIBILITY (h
->other
)
3070 && h
->root
.type
== bfd_link_hash_undefweak
))
3072 /* This is actually a static link, or it is a -Bsymbolic
3073 link and the symbol is defined locally, or the symbol
3074 was forced to be local because of a version file. We
3075 must initialize this entry in the global offset table.
3076 Since the offset must always be a multiple of 8, we
3077 use the least significant bit to record whether we
3078 have initialized it already.
3080 When doing a dynamic link, we create a .rela.got
3081 relocation entry to initialize the value. This is
3082 done in the finish_dynamic_symbol routine. */
3087 bfd_put_64 (output_bfd
, relocation
,
3088 base_got
->contents
+ off
);
3089 /* Note that this is harmless for the GOTPLT64 case,
3090 as -1 | 1 still is -1. */
3095 unresolved_reloc
= FALSE
;
3099 if (local_got_offsets
== NULL
)
3102 off
= local_got_offsets
[r_symndx
];
3104 /* The offset must always be a multiple of 8. We use
3105 the least significant bit to record whether we have
3106 already generated the necessary reloc. */
3111 bfd_put_64 (output_bfd
, relocation
,
3112 base_got
->contents
+ off
);
3117 Elf_Internal_Rela outrel
;
3120 /* We need to generate a R_X86_64_RELATIVE reloc
3121 for the dynamic linker. */
3126 outrel
.r_offset
= (base_got
->output_section
->vma
3127 + base_got
->output_offset
3129 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3130 outrel
.r_addend
= relocation
;
3132 loc
+= s
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3133 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3136 local_got_offsets
[r_symndx
] |= 1;
3140 if (off
>= (bfd_vma
) -2)
3143 relocation
= base_got
->output_section
->vma
3144 + base_got
->output_offset
+ off
;
3145 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3146 relocation
-= htab
->sgotplt
->output_section
->vma
3147 - htab
->sgotplt
->output_offset
;
3151 case R_X86_64_GOTOFF64
:
3152 /* Relocation is relative to the start of the global offset
3155 /* Check to make sure it isn't a protected function symbol
3156 for shared library since it may not be local when used
3157 as function address. */
3161 && h
->type
== STT_FUNC
3162 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3164 (*_bfd_error_handler
)
3165 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3166 input_bfd
, h
->root
.root
.string
);
3167 bfd_set_error (bfd_error_bad_value
);
3171 /* Note that sgot is not involved in this
3172 calculation. We always want the start of .got.plt. If we
3173 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3174 permitted by the ABI, we might have to change this
3176 relocation
-= htab
->sgotplt
->output_section
->vma
3177 + htab
->sgotplt
->output_offset
;
3180 case R_X86_64_GOTPC32
:
3181 case R_X86_64_GOTPC64
:
3182 /* Use global offset table as symbol value. */
3183 relocation
= htab
->sgotplt
->output_section
->vma
3184 + htab
->sgotplt
->output_offset
;
3185 unresolved_reloc
= FALSE
;
3188 case R_X86_64_PLTOFF64
:
3189 /* Relocation is PLT entry relative to GOT. For local
3190 symbols it's the symbol itself relative to GOT. */
3192 /* See PLT32 handling. */
3193 && h
->plt
.offset
!= (bfd_vma
) -1
3194 && htab
->splt
!= NULL
)
3196 relocation
= (htab
->splt
->output_section
->vma
3197 + htab
->splt
->output_offset
3199 unresolved_reloc
= FALSE
;
3202 relocation
-= htab
->sgotplt
->output_section
->vma
3203 + htab
->sgotplt
->output_offset
;
3206 case R_X86_64_PLT32
:
3207 /* Relocation is to the entry for this symbol in the
3208 procedure linkage table. */
3210 /* Resolve a PLT32 reloc against a local symbol directly,
3211 without using the procedure linkage table. */
3215 if (h
->plt
.offset
== (bfd_vma
) -1
3216 || htab
->splt
== NULL
)
3218 /* We didn't make a PLT entry for this symbol. This
3219 happens when statically linking PIC code, or when
3220 using -Bsymbolic. */
3224 relocation
= (htab
->splt
->output_section
->vma
3225 + htab
->splt
->output_offset
3227 unresolved_reloc
= FALSE
;
3234 && (input_section
->flags
& SEC_ALLOC
) != 0
3235 && (input_section
->flags
& SEC_READONLY
) != 0
3238 bfd_boolean fail
= FALSE
;
3240 = (r_type
== R_X86_64_PC32
3241 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3243 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3245 /* Symbol is referenced locally. Make sure it is
3246 defined locally or for a branch. */
3247 fail
= !h
->def_regular
&& !branch
;
3251 /* Symbol isn't referenced locally. We only allow
3252 branch to symbol with non-default visibility. */
3254 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3261 const char *pic
= "";
3263 switch (ELF_ST_VISIBILITY (h
->other
))
3266 v
= _("hidden symbol");
3269 v
= _("internal symbol");
3272 v
= _("protected symbol");
3276 pic
= _("; recompile with -fPIC");
3281 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3283 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3285 (*_bfd_error_handler
) (fmt
, input_bfd
,
3286 x86_64_elf_howto_table
[r_type
].name
,
3287 v
, h
->root
.root
.string
, pic
);
3288 bfd_set_error (bfd_error_bad_value
);
3299 /* FIXME: The ABI says the linker should make sure the value is
3300 the same when it's zeroextended to 64 bit. */
3302 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3307 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3308 || h
->root
.type
!= bfd_link_hash_undefweak
)
3309 && (! IS_X86_64_PCREL_TYPE (r_type
)
3310 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3311 || (ELIMINATE_COPY_RELOCS
3318 || h
->root
.type
== bfd_link_hash_undefweak
3319 || h
->root
.type
== bfd_link_hash_undefined
)))
3321 Elf_Internal_Rela outrel
;
3323 bfd_boolean skip
, relocate
;
3326 /* When generating a shared object, these relocations
3327 are copied into the output file to be resolved at run
3333 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3335 if (outrel
.r_offset
== (bfd_vma
) -1)
3337 else if (outrel
.r_offset
== (bfd_vma
) -2)
3338 skip
= TRUE
, relocate
= TRUE
;
3340 outrel
.r_offset
+= (input_section
->output_section
->vma
3341 + input_section
->output_offset
);
3344 memset (&outrel
, 0, sizeof outrel
);
3346 /* h->dynindx may be -1 if this symbol was marked to
3350 && (IS_X86_64_PCREL_TYPE (r_type
)
3352 || ! SYMBOLIC_BIND (info
, h
)
3353 || ! h
->def_regular
))
3355 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
3356 outrel
.r_addend
= rel
->r_addend
;
3360 /* This symbol is local, or marked to become local. */
3361 if (r_type
== R_X86_64_64
)
3364 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3365 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3371 if (bfd_is_abs_section (sec
))
3373 else if (sec
== NULL
|| sec
->owner
== NULL
)
3375 bfd_set_error (bfd_error_bad_value
);
3382 /* We are turning this relocation into one
3383 against a section symbol. It would be
3384 proper to subtract the symbol's value,
3385 osec->vma, from the emitted reloc addend,
3386 but ld.so expects buggy relocs. */
3387 osec
= sec
->output_section
;
3388 sindx
= elf_section_data (osec
)->dynindx
;
3391 asection
*oi
= htab
->elf
.text_index_section
;
3392 sindx
= elf_section_data (oi
)->dynindx
;
3394 BFD_ASSERT (sindx
!= 0);
3397 outrel
.r_info
= ELF64_R_INFO (sindx
, r_type
);
3398 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3402 sreloc
= elf_section_data (input_section
)->sreloc
;
3404 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
3406 loc
= sreloc
->contents
;
3407 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3408 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3410 /* If this reloc is against an external symbol, we do
3411 not want to fiddle with the addend. Otherwise, we
3412 need to include the symbol value so that it becomes
3413 an addend for the dynamic reloc. */
3420 case R_X86_64_TLSGD
:
3421 case R_X86_64_GOTPC32_TLSDESC
:
3422 case R_X86_64_TLSDESC_CALL
:
3423 case R_X86_64_GOTTPOFF
:
3424 tls_type
= GOT_UNKNOWN
;
3425 if (h
== NULL
&& local_got_offsets
)
3426 tls_type
= elf64_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3428 tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
3430 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3431 input_section
, contents
,
3432 symtab_hdr
, sym_hashes
,
3433 &r_type
, tls_type
, rel
,
3437 if (r_type
== R_X86_64_TPOFF32
)
3439 bfd_vma roff
= rel
->r_offset
;
3441 BFD_ASSERT (! unresolved_reloc
);
3443 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3445 /* GD->LE transition.
3446 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3447 .word 0x6666; rex64; call __tls_get_addr
3450 leaq foo@tpoff(%rax), %rax */
3451 memcpy (contents
+ roff
- 4,
3452 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3454 bfd_put_32 (output_bfd
,
3455 elf64_x86_64_tpoff (info
, relocation
),
3456 contents
+ roff
+ 8);
3457 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3461 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3463 /* GDesc -> LE transition.
3464 It's originally something like:
3465 leaq x@tlsdesc(%rip), %rax
3471 unsigned int val
, type
, type2
;
3473 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3474 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3475 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3476 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3477 contents
+ roff
- 3);
3478 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3479 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3480 contents
+ roff
- 1);
3481 bfd_put_32 (output_bfd
,
3482 elf64_x86_64_tpoff (info
, relocation
),
3486 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3488 /* GDesc -> LE transition.
3493 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3494 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3497 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3499 /* IE->LE transition:
3500 Originally it can be one of:
3501 movq foo@gottpoff(%rip), %reg
3502 addq foo@gottpoff(%rip), %reg
3505 leaq foo(%reg), %reg
3508 unsigned int val
, type
, reg
;
3510 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3511 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3512 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3518 bfd_put_8 (output_bfd
, 0x49,
3519 contents
+ roff
- 3);
3520 bfd_put_8 (output_bfd
, 0xc7,
3521 contents
+ roff
- 2);
3522 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3523 contents
+ roff
- 1);
3527 /* addq -> addq - addressing with %rsp/%r12 is
3530 bfd_put_8 (output_bfd
, 0x49,
3531 contents
+ roff
- 3);
3532 bfd_put_8 (output_bfd
, 0x81,
3533 contents
+ roff
- 2);
3534 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3535 contents
+ roff
- 1);
3541 bfd_put_8 (output_bfd
, 0x4d,
3542 contents
+ roff
- 3);
3543 bfd_put_8 (output_bfd
, 0x8d,
3544 contents
+ roff
- 2);
3545 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3546 contents
+ roff
- 1);
3548 bfd_put_32 (output_bfd
,
3549 elf64_x86_64_tpoff (info
, relocation
),
3557 if (htab
->sgot
== NULL
)
3562 off
= h
->got
.offset
;
3563 offplt
= elf64_x86_64_hash_entry (h
)->tlsdesc_got
;
3567 if (local_got_offsets
== NULL
)
3570 off
= local_got_offsets
[r_symndx
];
3571 offplt
= local_tlsdesc_gotents
[r_symndx
];
3578 Elf_Internal_Rela outrel
;
3583 if (htab
->srelgot
== NULL
)
3586 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3588 if (GOT_TLS_GDESC_P (tls_type
))
3590 outrel
.r_info
= ELF64_R_INFO (indx
, R_X86_64_TLSDESC
);
3591 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3592 + 2 * GOT_ENTRY_SIZE
<= htab
->sgotplt
->size
);
3593 outrel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3594 + htab
->sgotplt
->output_offset
3596 + htab
->sgotplt_jump_table_size
);
3597 sreloc
= htab
->srelplt
;
3598 loc
= sreloc
->contents
;
3599 loc
+= sreloc
->reloc_count
++
3600 * sizeof (Elf64_External_Rela
);
3601 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3602 <= sreloc
->contents
+ sreloc
->size
);
3604 outrel
.r_addend
= relocation
- elf64_x86_64_dtpoff_base (info
);
3606 outrel
.r_addend
= 0;
3607 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3610 sreloc
= htab
->srelgot
;
3612 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3613 + htab
->sgot
->output_offset
+ off
);
3615 if (GOT_TLS_GD_P (tls_type
))
3616 dr_type
= R_X86_64_DTPMOD64
;
3617 else if (GOT_TLS_GDESC_P (tls_type
))
3620 dr_type
= R_X86_64_TPOFF64
;
3622 bfd_put_64 (output_bfd
, 0, htab
->sgot
->contents
+ off
);
3623 outrel
.r_addend
= 0;
3624 if ((dr_type
== R_X86_64_TPOFF64
3625 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3626 outrel
.r_addend
= relocation
- elf64_x86_64_dtpoff_base (info
);
3627 outrel
.r_info
= ELF64_R_INFO (indx
, dr_type
);
3629 loc
= sreloc
->contents
;
3630 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3631 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3632 <= sreloc
->contents
+ sreloc
->size
);
3633 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3635 if (GOT_TLS_GD_P (tls_type
))
3639 BFD_ASSERT (! unresolved_reloc
);
3640 bfd_put_64 (output_bfd
,
3641 relocation
- elf64_x86_64_dtpoff_base (info
),
3642 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3646 bfd_put_64 (output_bfd
, 0,
3647 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3648 outrel
.r_info
= ELF64_R_INFO (indx
,
3650 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3651 sreloc
->reloc_count
++;
3652 loc
+= sizeof (Elf64_External_Rela
);
3653 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3654 <= sreloc
->contents
+ sreloc
->size
);
3655 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3663 local_got_offsets
[r_symndx
] |= 1;
3666 if (off
>= (bfd_vma
) -2
3667 && ! GOT_TLS_GDESC_P (tls_type
))
3669 if (r_type
== ELF64_R_TYPE (rel
->r_info
))
3671 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3672 || r_type
== R_X86_64_TLSDESC_CALL
)
3673 relocation
= htab
->sgotplt
->output_section
->vma
3674 + htab
->sgotplt
->output_offset
3675 + offplt
+ htab
->sgotplt_jump_table_size
;
3677 relocation
= htab
->sgot
->output_section
->vma
3678 + htab
->sgot
->output_offset
+ off
;
3679 unresolved_reloc
= FALSE
;
3683 bfd_vma roff
= rel
->r_offset
;
3685 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3687 /* GD->IE transition.
3688 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3689 .word 0x6666; rex64; call __tls_get_addr@plt
3692 addq foo@gottpoff(%rip), %rax */
3693 memcpy (contents
+ roff
- 4,
3694 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3697 relocation
= (htab
->sgot
->output_section
->vma
3698 + htab
->sgot
->output_offset
+ off
3700 - input_section
->output_section
->vma
3701 - input_section
->output_offset
3703 bfd_put_32 (output_bfd
, relocation
,
3704 contents
+ roff
+ 8);
3705 /* Skip R_X86_64_PLT32. */
3709 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3711 /* GDesc -> IE transition.
3712 It's originally something like:
3713 leaq x@tlsdesc(%rip), %rax
3716 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3719 unsigned int val
, type
, type2
;
3721 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3722 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3723 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3725 /* Now modify the instruction as appropriate. To
3726 turn a leaq into a movq in the form we use it, it
3727 suffices to change the second byte from 0x8d to
3729 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3731 bfd_put_32 (output_bfd
,
3732 htab
->sgot
->output_section
->vma
3733 + htab
->sgot
->output_offset
+ off
3735 - input_section
->output_section
->vma
3736 - input_section
->output_offset
3741 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3743 /* GDesc -> IE transition.
3750 unsigned int val
, type
;
3752 type
= bfd_get_8 (input_bfd
, contents
+ roff
);
3753 val
= bfd_get_8 (input_bfd
, contents
+ roff
+ 1);
3754 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3755 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3763 case R_X86_64_TLSLD
:
3764 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3765 input_section
, contents
,
3766 symtab_hdr
, sym_hashes
,
3767 &r_type
, GOT_UNKNOWN
,
3771 if (r_type
!= R_X86_64_TLSLD
)
3773 /* LD->LE transition:
3774 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3776 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3778 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3779 memcpy (contents
+ rel
->r_offset
- 3,
3780 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3781 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3786 if (htab
->sgot
== NULL
)
3789 off
= htab
->tls_ld_got
.offset
;
3794 Elf_Internal_Rela outrel
;
3797 if (htab
->srelgot
== NULL
)
3800 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3801 + htab
->sgot
->output_offset
+ off
);
3803 bfd_put_64 (output_bfd
, 0,
3804 htab
->sgot
->contents
+ off
);
3805 bfd_put_64 (output_bfd
, 0,
3806 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3807 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_DTPMOD64
);
3808 outrel
.r_addend
= 0;
3809 loc
= htab
->srelgot
->contents
;
3810 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3811 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3812 htab
->tls_ld_got
.offset
|= 1;
3814 relocation
= htab
->sgot
->output_section
->vma
3815 + htab
->sgot
->output_offset
+ off
;
3816 unresolved_reloc
= FALSE
;
3819 case R_X86_64_DTPOFF32
:
3820 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
3821 relocation
-= elf64_x86_64_dtpoff_base (info
);
3823 relocation
= elf64_x86_64_tpoff (info
, relocation
);
3826 case R_X86_64_TPOFF32
:
3827 BFD_ASSERT (! info
->shared
);
3828 relocation
= elf64_x86_64_tpoff (info
, relocation
);
3835 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3836 because such sections are not SEC_ALLOC and thus ld.so will
3837 not process them. */
3838 if (unresolved_reloc
3839 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3841 (*_bfd_error_handler
)
3842 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3845 (long) rel
->r_offset
,
3847 h
->root
.root
.string
);
3850 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3851 contents
, rel
->r_offset
,
3852 relocation
, rel
->r_addend
);
3854 if (r
!= bfd_reloc_ok
)
3859 name
= h
->root
.root
.string
;
3862 name
= bfd_elf_string_from_elf_section (input_bfd
,
3863 symtab_hdr
->sh_link
,
3868 name
= bfd_section_name (input_bfd
, sec
);
3871 if (r
== bfd_reloc_overflow
)
3873 if (! ((*info
->callbacks
->reloc_overflow
)
3874 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3875 (bfd_vma
) 0, input_bfd
, input_section
,
3881 (*_bfd_error_handler
)
3882 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3883 input_bfd
, input_section
,
3884 (long) rel
->r_offset
, name
, (int) r
);
3893 /* Finish up dynamic symbol handling. We set the contents of various
3894 dynamic sections here. */
3897 elf64_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3898 struct bfd_link_info
*info
,
3899 struct elf_link_hash_entry
*h
,
3900 Elf_Internal_Sym
*sym
)
3902 struct elf64_x86_64_link_hash_table
*htab
;
3904 htab
= elf64_x86_64_hash_table (info
);
3906 if (h
->plt
.offset
!= (bfd_vma
) -1)
3910 Elf_Internal_Rela rela
;
3912 asection
*plt
, *gotplt
, *relplt
;
3914 /* When building a static executable, use .iplt, .igot.plt and
3915 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3916 if (htab
->splt
!= NULL
)
3919 gotplt
= htab
->sgotplt
;
3920 relplt
= htab
->srelplt
;
3925 gotplt
= htab
->igotplt
;
3926 relplt
= htab
->irelplt
;
3929 /* This symbol has an entry in the procedure linkage table. Set
3931 if ((h
->dynindx
== -1
3932 && !((h
->forced_local
|| info
->executable
)
3934 && h
->type
== STT_GNU_IFUNC
))
3940 /* Get the index in the procedure linkage table which
3941 corresponds to this symbol. This is the index of this symbol
3942 in all the symbols for which we are making plt entries. The
3943 first entry in the procedure linkage table is reserved.
3945 Get the offset into the .got table of the entry that
3946 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3947 bytes. The first three are reserved for the dynamic linker.
3949 For static executables, we don't reserve anything. */
3951 if (plt
== htab
->splt
)
3953 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3954 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3958 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3959 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
3962 /* Fill in the entry in the procedure linkage table. */
3963 memcpy (plt
->contents
+ h
->plt
.offset
, elf64_x86_64_plt_entry
,
3966 /* Insert the relocation positions of the plt section. The magic
3967 numbers at the end of the statements are the positions of the
3968 relocations in the plt section. */
3969 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3970 instruction uses 6 bytes, subtract this value. */
3971 bfd_put_32 (output_bfd
,
3972 (gotplt
->output_section
->vma
3973 + gotplt
->output_offset
3975 - plt
->output_section
->vma
3976 - plt
->output_offset
3979 plt
->contents
+ h
->plt
.offset
+ 2);
3981 /* Don't fill PLT entry for static executables. */
3982 if (plt
== htab
->splt
)
3984 /* Put relocation index. */
3985 bfd_put_32 (output_bfd
, plt_index
,
3986 plt
->contents
+ h
->plt
.offset
+ 7);
3987 /* Put offset for jmp .PLT0. */
3988 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3989 plt
->contents
+ h
->plt
.offset
+ 12);
3992 /* Fill in the entry in the global offset table, initially this
3993 points to the pushq instruction in the PLT which is at offset 6. */
3994 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
3995 + plt
->output_offset
3996 + h
->plt
.offset
+ 6),
3997 gotplt
->contents
+ got_offset
);
3999 /* Fill in the entry in the .rela.plt section. */
4000 rela
.r_offset
= (gotplt
->output_section
->vma
4001 + gotplt
->output_offset
4003 if (h
->dynindx
== -1
4004 || ((info
->executable
4005 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4007 && h
->type
== STT_GNU_IFUNC
))
4009 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4010 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4011 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_IRELATIVE
);
4012 rela
.r_addend
= (h
->root
.u
.def
.value
4013 + h
->root
.u
.def
.section
->output_section
->vma
4014 + h
->root
.u
.def
.section
->output_offset
);
4018 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4021 loc
= relplt
->contents
+ plt_index
* sizeof (Elf64_External_Rela
);
4022 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
4024 if (!h
->def_regular
)
4026 /* Mark the symbol as undefined, rather than as defined in
4027 the .plt section. Leave the value if there were any
4028 relocations where pointer equality matters (this is a clue
4029 for the dynamic linker, to make function pointer
4030 comparisons work between an application and shared
4031 library), otherwise set it to zero. If a function is only
4032 called from a binary, there is no need to slow down
4033 shared libraries because of that. */
4034 sym
->st_shndx
= SHN_UNDEF
;
4035 if (!h
->pointer_equality_needed
)
4040 if (h
->got
.offset
!= (bfd_vma
) -1
4041 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h
)->tls_type
)
4042 && elf64_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4044 Elf_Internal_Rela rela
;
4047 /* This symbol has an entry in the global offset table. Set it
4049 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
4052 rela
.r_offset
= (htab
->sgot
->output_section
->vma
4053 + htab
->sgot
->output_offset
4054 + (h
->got
.offset
&~ (bfd_vma
) 1));
4056 /* If this is a static link, or it is a -Bsymbolic link and the
4057 symbol is defined locally or was forced to be local because
4058 of a version file, we just want to emit a RELATIVE reloc.
4059 The entry in the global offset table will already have been
4060 initialized in the relocate_section function. */
4062 && h
->type
== STT_GNU_IFUNC
)
4066 /* Generate R_X86_64_GLOB_DAT. */
4071 if (!h
->pointer_equality_needed
)
4074 /* For non-shared object, we can't use .got.plt, which
4075 contains the real function addres if we need pointer
4076 equality. We load the GOT entry with the PLT entry. */
4077 asection
*plt
= htab
->splt
? htab
->splt
: htab
->iplt
;
4078 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4079 + plt
->output_offset
4081 htab
->sgot
->contents
+ h
->got
.offset
);
4085 else if (info
->shared
4086 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4088 if (!h
->def_regular
)
4090 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4091 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
4092 rela
.r_addend
= (h
->root
.u
.def
.value
4093 + h
->root
.u
.def
.section
->output_section
->vma
4094 + h
->root
.u
.def
.section
->output_offset
);
4098 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4100 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4101 htab
->sgot
->contents
+ h
->got
.offset
);
4102 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_GLOB_DAT
);
4106 loc
= htab
->srelgot
->contents
;
4107 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
4108 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
4113 Elf_Internal_Rela rela
;
4116 /* This symbol needs a copy reloc. Set it up. */
4118 if (h
->dynindx
== -1
4119 || (h
->root
.type
!= bfd_link_hash_defined
4120 && h
->root
.type
!= bfd_link_hash_defweak
)
4121 || htab
->srelbss
== NULL
)
4124 rela
.r_offset
= (h
->root
.u
.def
.value
4125 + h
->root
.u
.def
.section
->output_section
->vma
4126 + h
->root
.u
.def
.section
->output_offset
);
4127 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_COPY
);
4129 loc
= htab
->srelbss
->contents
;
4130 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf64_External_Rela
);
4131 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
4134 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4135 be NULL for local symbols. */
4137 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4138 || h
== htab
->elf
.hgot
))
4139 sym
->st_shndx
= SHN_ABS
;
4144 /* Finish up local dynamic symbol handling. We set the contents of
4145 various dynamic sections here. */
4148 elf64_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4150 struct elf_link_hash_entry
*h
4151 = (struct elf_link_hash_entry
*) *slot
;
4152 struct bfd_link_info
*info
4153 = (struct bfd_link_info
*) inf
;
4155 return elf64_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4159 /* Used to decide how to sort relocs in an optimal manner for the
4160 dynamic linker, before writing them out. */
4162 static enum elf_reloc_type_class
4163 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4165 switch ((int) ELF64_R_TYPE (rela
->r_info
))
4167 case R_X86_64_RELATIVE
:
4168 return reloc_class_relative
;
4169 case R_X86_64_JUMP_SLOT
:
4170 return reloc_class_plt
;
4172 return reloc_class_copy
;
4174 return reloc_class_normal
;
4178 /* Finish up the dynamic sections. */
4181 elf64_x86_64_finish_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
4183 struct elf64_x86_64_link_hash_table
*htab
;
4187 htab
= elf64_x86_64_hash_table (info
);
4188 dynobj
= htab
->elf
.dynobj
;
4189 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4191 if (htab
->elf
.dynamic_sections_created
)
4193 Elf64_External_Dyn
*dyncon
, *dynconend
;
4195 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
4198 dyncon
= (Elf64_External_Dyn
*) sdyn
->contents
;
4199 dynconend
= (Elf64_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
4200 for (; dyncon
< dynconend
; dyncon
++)
4202 Elf_Internal_Dyn dyn
;
4205 bfd_elf64_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4214 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4218 dyn
.d_un
.d_ptr
= htab
->srelplt
->output_section
->vma
;
4222 s
= htab
->srelplt
->output_section
;
4223 dyn
.d_un
.d_val
= s
->size
;
4227 /* The procedure linkage table relocs (DT_JMPREL) should
4228 not be included in the overall relocs (DT_RELA).
4229 Therefore, we override the DT_RELASZ entry here to
4230 make it not include the JMPREL relocs. Since the
4231 linker script arranges for .rela.plt to follow all
4232 other relocation sections, we don't have to worry
4233 about changing the DT_RELA entry. */
4234 if (htab
->srelplt
!= NULL
)
4236 s
= htab
->srelplt
->output_section
;
4237 dyn
.d_un
.d_val
-= s
->size
;
4241 case DT_TLSDESC_PLT
:
4243 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4244 + htab
->tlsdesc_plt
;
4247 case DT_TLSDESC_GOT
:
4249 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4250 + htab
->tlsdesc_got
;
4254 bfd_elf64_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4257 /* Fill in the special first entry in the procedure linkage table. */
4258 if (htab
->splt
&& htab
->splt
->size
> 0)
4260 /* Fill in the first entry in the procedure linkage table. */
4261 memcpy (htab
->splt
->contents
, elf64_x86_64_plt0_entry
,
4263 /* Add offset for pushq GOT+8(%rip), since the instruction
4264 uses 6 bytes subtract this value. */
4265 bfd_put_32 (output_bfd
,
4266 (htab
->sgotplt
->output_section
->vma
4267 + htab
->sgotplt
->output_offset
4269 - htab
->splt
->output_section
->vma
4270 - htab
->splt
->output_offset
4272 htab
->splt
->contents
+ 2);
4273 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4274 the end of the instruction. */
4275 bfd_put_32 (output_bfd
,
4276 (htab
->sgotplt
->output_section
->vma
4277 + htab
->sgotplt
->output_offset
4279 - htab
->splt
->output_section
->vma
4280 - htab
->splt
->output_offset
4282 htab
->splt
->contents
+ 8);
4284 elf_section_data (htab
->splt
->output_section
)->this_hdr
.sh_entsize
=
4287 if (htab
->tlsdesc_plt
)
4289 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4290 htab
->sgot
->contents
+ htab
->tlsdesc_got
);
4292 memcpy (htab
->splt
->contents
+ htab
->tlsdesc_plt
,
4293 elf64_x86_64_plt0_entry
,
4296 /* Add offset for pushq GOT+8(%rip), since the
4297 instruction uses 6 bytes subtract this value. */
4298 bfd_put_32 (output_bfd
,
4299 (htab
->sgotplt
->output_section
->vma
4300 + htab
->sgotplt
->output_offset
4302 - htab
->splt
->output_section
->vma
4303 - htab
->splt
->output_offset
4306 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4307 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4308 htab->tlsdesc_got. The 12 is the offset to the end of
4310 bfd_put_32 (output_bfd
,
4311 (htab
->sgot
->output_section
->vma
4312 + htab
->sgot
->output_offset
4314 - htab
->splt
->output_section
->vma
4315 - htab
->splt
->output_offset
4318 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4325 /* Fill in the first three entries in the global offset table. */
4326 if (htab
->sgotplt
->size
> 0)
4328 /* Set the first entry in the global offset table to the address of
4329 the dynamic section. */
4331 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
);
4333 bfd_put_64 (output_bfd
,
4334 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4335 htab
->sgotplt
->contents
);
4336 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4337 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4338 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4341 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4345 if (htab
->sgot
&& htab
->sgot
->size
> 0)
4346 elf_section_data (htab
->sgot
->output_section
)->this_hdr
.sh_entsize
4349 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4350 htab_traverse (htab
->loc_hash_table
,
4351 elf64_x86_64_finish_local_dynamic_symbol
,
4357 /* Return address for Ith PLT stub in section PLT, for relocation REL
4358 or (bfd_vma) -1 if it should not be included. */
4361 elf64_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4362 const arelent
*rel ATTRIBUTE_UNUSED
)
4364 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4367 /* Handle an x86-64 specific section when reading an object file. This
4368 is called when elfcode.h finds a section with an unknown type. */
4371 elf64_x86_64_section_from_shdr (bfd
*abfd
,
4372 Elf_Internal_Shdr
*hdr
,
4376 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4379 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4385 /* Hook called by the linker routine which adds symbols from an object
4386 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4390 elf64_x86_64_add_symbol_hook (bfd
*abfd
,
4391 struct bfd_link_info
*info
,
4392 Elf_Internal_Sym
*sym
,
4393 const char **namep ATTRIBUTE_UNUSED
,
4394 flagword
*flagsp ATTRIBUTE_UNUSED
,
4400 switch (sym
->st_shndx
)
4402 case SHN_X86_64_LCOMMON
:
4403 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4406 lcomm
= bfd_make_section_with_flags (abfd
,
4410 | SEC_LINKER_CREATED
));
4413 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4416 *valp
= sym
->st_size
;
4420 if (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4421 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4427 /* Given a BFD section, try to locate the corresponding ELF section
4431 elf64_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4432 asection
*sec
, int *index
)
4434 if (sec
== &_bfd_elf_large_com_section
)
4436 *index
= SHN_X86_64_LCOMMON
;
4442 /* Process a symbol. */
4445 elf64_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4448 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4450 switch (elfsym
->internal_elf_sym
.st_shndx
)
4452 case SHN_X86_64_LCOMMON
:
4453 asym
->section
= &_bfd_elf_large_com_section
;
4454 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4455 /* Common symbol doesn't set BSF_GLOBAL. */
4456 asym
->flags
&= ~BSF_GLOBAL
;
4462 elf64_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4464 return (sym
->st_shndx
== SHN_COMMON
4465 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4469 elf64_x86_64_common_section_index (asection
*sec
)
4471 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4474 return SHN_X86_64_LCOMMON
;
4478 elf64_x86_64_common_section (asection
*sec
)
4480 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4481 return bfd_com_section_ptr
;
4483 return &_bfd_elf_large_com_section
;
4487 elf64_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4488 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4489 struct elf_link_hash_entry
*h
,
4490 Elf_Internal_Sym
*sym
,
4492 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4493 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4494 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4495 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4496 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4497 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4498 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4499 bfd_boolean
*newdyn
,
4500 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4501 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4502 bfd
*abfd ATTRIBUTE_UNUSED
,
4504 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4505 bfd_boolean
*olddyn
,
4506 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4507 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4511 /* A normal common symbol and a large common symbol result in a
4512 normal common symbol. We turn the large common symbol into a
4515 && h
->root
.type
== bfd_link_hash_common
4517 && bfd_is_com_section (*sec
)
4520 if (sym
->st_shndx
== SHN_COMMON
4521 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4523 h
->root
.u
.c
.p
->section
4524 = bfd_make_section_old_way (oldbfd
, "COMMON");
4525 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4527 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4528 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4529 *psec
= *sec
= bfd_com_section_ptr
;
4536 elf64_x86_64_additional_program_headers (bfd
*abfd
,
4537 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4542 /* Check to see if we need a large readonly segment. */
4543 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4544 if (s
&& (s
->flags
& SEC_LOAD
))
4547 /* Check to see if we need a large data segment. Since .lbss sections
4548 is placed right after the .bss section, there should be no need for
4549 a large data segment just because of .lbss. */
4550 s
= bfd_get_section_by_name (abfd
, ".ldata");
4551 if (s
&& (s
->flags
& SEC_LOAD
))
4557 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4560 elf64_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4562 if (h
->plt
.offset
!= (bfd_vma
) -1
4564 && !h
->pointer_equality_needed
)
4567 return _bfd_elf_hash_symbol (h
);
4570 static const struct bfd_elf_special_section
4571 elf64_x86_64_special_sections
[]=
4573 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4574 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4575 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4576 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4577 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4578 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4579 { NULL
, 0, 0, 0, 0 }
4582 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4583 #define TARGET_LITTLE_NAME "elf64-x86-64"
4584 #define ELF_ARCH bfd_arch_i386
4585 #define ELF_MACHINE_CODE EM_X86_64
4586 #define ELF_MAXPAGESIZE 0x200000
4587 #define ELF_MINPAGESIZE 0x1000
4588 #define ELF_COMMONPAGESIZE 0x1000
4590 #define elf_backend_can_gc_sections 1
4591 #define elf_backend_can_refcount 1
4592 #define elf_backend_want_got_plt 1
4593 #define elf_backend_plt_readonly 1
4594 #define elf_backend_want_plt_sym 0
4595 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4596 #define elf_backend_rela_normal 1
4598 #define elf_info_to_howto elf64_x86_64_info_to_howto
4600 #define bfd_elf64_bfd_link_hash_table_create \
4601 elf64_x86_64_link_hash_table_create
4602 #define bfd_elf64_bfd_link_hash_table_free \
4603 elf64_x86_64_link_hash_table_free
4604 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
4605 #define bfd_elf64_bfd_reloc_name_lookup \
4606 elf64_x86_64_reloc_name_lookup
4608 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
4609 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4610 #define elf_backend_check_relocs elf64_x86_64_check_relocs
4611 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4612 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4613 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4614 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4615 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4616 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
4617 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4618 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
4619 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
4620 #define elf_backend_relocate_section elf64_x86_64_relocate_section
4621 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
4622 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
4623 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4624 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
4625 #define elf_backend_object_p elf64_x86_64_elf_object_p
4626 #define bfd_elf64_mkobject elf64_x86_64_mkobject
4628 #define elf_backend_section_from_shdr \
4629 elf64_x86_64_section_from_shdr
4631 #define elf_backend_section_from_bfd_section \
4632 elf64_x86_64_elf_section_from_bfd_section
4633 #define elf_backend_add_symbol_hook \
4634 elf64_x86_64_add_symbol_hook
4635 #define elf_backend_symbol_processing \
4636 elf64_x86_64_symbol_processing
4637 #define elf_backend_common_section_index \
4638 elf64_x86_64_common_section_index
4639 #define elf_backend_common_section \
4640 elf64_x86_64_common_section
4641 #define elf_backend_common_definition \
4642 elf64_x86_64_common_definition
4643 #define elf_backend_merge_symbol \
4644 elf64_x86_64_merge_symbol
4645 #define elf_backend_special_sections \
4646 elf64_x86_64_special_sections
4647 #define elf_backend_additional_program_headers \
4648 elf64_x86_64_additional_program_headers
4649 #define elf_backend_hash_symbol \
4650 elf64_x86_64_hash_symbol
4652 #undef elf_backend_post_process_headers
4653 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4655 #include "elf64-target.h"
4657 /* FreeBSD support. */
4659 #undef TARGET_LITTLE_SYM
4660 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4661 #undef TARGET_LITTLE_NAME
4662 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4665 #define ELF_OSABI ELFOSABI_FREEBSD
4668 #define elf64_bed elf64_x86_64_fbsd_bed
4670 #include "elf64-target.h"