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"
30 #include "elf/x86-64.h"
32 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
33 #define MINUS_ONE (~ (bfd_vma) 0)
35 /* The relocation "howto" table. Order of fields:
36 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
37 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
38 static reloc_howto_type x86_64_elf_howto_table
[] =
40 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
41 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
43 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
44 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
46 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
47 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
49 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
50 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
52 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
53 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
55 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
56 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
58 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
59 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
61 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
64 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
65 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
67 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
68 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
70 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
71 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
73 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
74 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
76 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
77 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
78 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
79 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
80 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
81 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
82 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
83 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
84 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
85 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
87 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
88 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
90 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
91 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
93 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
94 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
96 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
97 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
99 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
100 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
102 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
103 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
105 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
106 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
108 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
109 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
111 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
112 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
113 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
114 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
115 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
116 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
117 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
118 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
120 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
121 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
123 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
124 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
125 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
126 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
127 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
129 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
130 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
134 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
135 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
136 "R_X86_64_GOTPC32_TLSDESC",
137 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
138 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
139 complain_overflow_dont
, bfd_elf_generic_reloc
,
140 "R_X86_64_TLSDESC_CALL",
142 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
143 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
145 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
147 /* We have a gap in the reloc numbers here.
148 R_X86_64_standard counts the number up to this point, and
149 R_X86_64_vt_offset is the value to subtract from a reloc type of
150 R_X86_64_GNU_VT* to form an index into this table. */
151 #define R_X86_64_standard (R_X86_64_TLSDESC + 1)
152 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
156 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
158 /* GNU extension to record C++ vtable member usage. */
159 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
160 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
164 /* Map BFD relocs to the x86_64 elf relocs. */
167 bfd_reloc_code_real_type bfd_reloc_val
;
168 unsigned char elf_reloc_val
;
171 static const struct elf_reloc_map x86_64_reloc_map
[] =
173 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
174 { BFD_RELOC_64
, R_X86_64_64
, },
175 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
176 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
177 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
178 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
179 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
180 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
181 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
182 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
183 { BFD_RELOC_32
, R_X86_64_32
, },
184 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
185 { BFD_RELOC_16
, R_X86_64_16
, },
186 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
187 { BFD_RELOC_8
, R_X86_64_8
, },
188 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
189 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
190 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
191 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
192 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
193 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
194 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
195 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
196 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
197 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
198 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
199 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
200 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
201 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
202 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
203 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
204 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
205 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
206 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
207 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
208 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
209 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
212 static reloc_howto_type
*
213 elf64_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
217 if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
218 || r_type
>= (unsigned int) R_X86_64_max
)
220 if (r_type
>= (unsigned int) R_X86_64_standard
)
222 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
224 r_type
= R_X86_64_NONE
;
229 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
230 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
231 return &x86_64_elf_howto_table
[i
];
234 /* Given a BFD reloc type, return a HOWTO structure. */
235 static reloc_howto_type
*
236 elf64_x86_64_reloc_type_lookup (bfd
*abfd
,
237 bfd_reloc_code_real_type code
)
241 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
244 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
245 return elf64_x86_64_rtype_to_howto (abfd
,
246 x86_64_reloc_map
[i
].elf_reloc_val
);
251 static reloc_howto_type
*
252 elf64_x86_64_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
258 i
< (sizeof (x86_64_elf_howto_table
)
259 / sizeof (x86_64_elf_howto_table
[0]));
261 if (x86_64_elf_howto_table
[i
].name
!= NULL
262 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
263 return &x86_64_elf_howto_table
[i
];
268 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
271 elf64_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
272 Elf_Internal_Rela
*dst
)
276 r_type
= ELF64_R_TYPE (dst
->r_info
);
277 cache_ptr
->howto
= elf64_x86_64_rtype_to_howto (abfd
, r_type
);
278 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
281 /* Support for core dump NOTE sections. */
283 elf64_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
288 switch (note
->descsz
)
293 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
295 elf_tdata (abfd
)->core_signal
296 = bfd_get_16 (abfd
, note
->descdata
+ 12);
299 elf_tdata (abfd
)->core_pid
300 = bfd_get_32 (abfd
, note
->descdata
+ 32);
309 /* Make a ".reg/999" section. */
310 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
311 size
, note
->descpos
+ offset
);
315 elf64_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
317 switch (note
->descsz
)
322 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
323 elf_tdata (abfd
)->core_program
324 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
325 elf_tdata (abfd
)->core_command
326 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
329 /* Note that for some reason, a spurious space is tacked
330 onto the end of the args in some (at least one anyway)
331 implementations, so strip it off if it exists. */
334 char *command
= elf_tdata (abfd
)->core_command
;
335 int n
= strlen (command
);
337 if (0 < n
&& command
[n
- 1] == ' ')
338 command
[n
- 1] = '\0';
344 /* Functions for the x86-64 ELF linker. */
346 /* The name of the dynamic interpreter. This is put in the .interp
349 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
351 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
352 copying dynamic variables from a shared lib into an app's dynbss
353 section, and instead use a dynamic relocation to point into the
355 #define ELIMINATE_COPY_RELOCS 1
357 /* The size in bytes of an entry in the global offset table. */
359 #define GOT_ENTRY_SIZE 8
361 /* The size in bytes of an entry in the procedure linkage table. */
363 #define PLT_ENTRY_SIZE 16
365 /* The first entry in a procedure linkage table looks like this. See the
366 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
368 static const bfd_byte elf64_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
370 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
371 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
372 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
375 /* Subsequent entries in a procedure linkage table look like this. */
377 static const bfd_byte elf64_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
379 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
380 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
381 0x68, /* pushq immediate */
382 0, 0, 0, 0, /* replaced with index into relocation table. */
383 0xe9, /* jmp relative */
384 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
387 /* The x86-64 linker needs to keep track of the number of relocs that
388 it decides to copy as dynamic relocs in check_relocs for each symbol.
389 This is so that it can later discard them if they are found to be
390 unnecessary. We store the information in a field extending the
391 regular ELF linker hash table. */
393 struct elf64_x86_64_dyn_relocs
396 struct elf64_x86_64_dyn_relocs
*next
;
398 /* The input section of the reloc. */
401 /* Total number of relocs copied for the input section. */
404 /* Number of pc-relative relocs copied for the input section. */
405 bfd_size_type pc_count
;
408 /* x86-64 ELF linker hash entry. */
410 struct elf64_x86_64_link_hash_entry
412 struct elf_link_hash_entry elf
;
414 /* Track dynamic relocs copied for this symbol. */
415 struct elf64_x86_64_dyn_relocs
*dyn_relocs
;
417 #define GOT_UNKNOWN 0
421 #define GOT_TLS_GDESC 4
422 #define GOT_TLS_GD_BOTH_P(type) \
423 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
424 #define GOT_TLS_GD_P(type) \
425 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
426 #define GOT_TLS_GDESC_P(type) \
427 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
428 #define GOT_TLS_GD_ANY_P(type) \
429 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
430 unsigned char tls_type
;
432 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
433 starting at the end of the jump table. */
437 #define elf64_x86_64_hash_entry(ent) \
438 ((struct elf64_x86_64_link_hash_entry *)(ent))
440 struct elf64_x86_64_obj_tdata
442 struct elf_obj_tdata root
;
444 /* tls_type for each local got entry. */
445 char *local_got_tls_type
;
447 /* GOTPLT entries for TLS descriptors. */
448 bfd_vma
*local_tlsdesc_gotent
;
451 #define elf64_x86_64_tdata(abfd) \
452 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
454 #define elf64_x86_64_local_got_tls_type(abfd) \
455 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
457 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
458 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
460 #define is_x86_64_elf(bfd) \
461 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
462 && elf_tdata (bfd) != NULL \
463 && elf_object_id (bfd) == X86_64_ELF_TDATA)
466 elf64_x86_64_mkobject (bfd
*abfd
)
468 return bfd_elf_allocate_object (abfd
, sizeof (struct elf64_x86_64_obj_tdata
),
472 /* x86-64 ELF linker hash table. */
474 struct elf64_x86_64_link_hash_table
476 struct elf_link_hash_table elf
;
478 /* Short-cuts to get to dynamic linker sections. */
487 /* The offset into splt of the PLT entry for the TLS descriptor
488 resolver. Special values are 0, if not necessary (or not found
489 to be necessary yet), and -1 if needed but not determined
492 /* The offset into sgot of the GOT entry used by the PLT entry
497 bfd_signed_vma refcount
;
501 /* The amount of space used by the jump slots in the GOT. */
502 bfd_vma sgotplt_jump_table_size
;
504 /* Small local sym to section mapping cache. */
505 struct sym_sec_cache sym_sec
;
507 /* _TLS_MODULE_BASE_ symbol. */
508 struct bfd_link_hash_entry
*tls_module_base
;
511 /* Get the x86-64 ELF linker hash table from a link_info structure. */
513 #define elf64_x86_64_hash_table(p) \
514 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
516 #define elf64_x86_64_compute_jump_table_size(htab) \
517 ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE)
519 /* Create an entry in an x86-64 ELF linker hash table. */
521 static struct bfd_hash_entry
*
522 link_hash_newfunc (struct bfd_hash_entry
*entry
, struct bfd_hash_table
*table
,
525 /* Allocate the structure if it has not already been allocated by a
529 entry
= bfd_hash_allocate (table
,
530 sizeof (struct elf64_x86_64_link_hash_entry
));
535 /* Call the allocation method of the superclass. */
536 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
539 struct elf64_x86_64_link_hash_entry
*eh
;
541 eh
= (struct elf64_x86_64_link_hash_entry
*) entry
;
542 eh
->dyn_relocs
= NULL
;
543 eh
->tls_type
= GOT_UNKNOWN
;
544 eh
->tlsdesc_got
= (bfd_vma
) -1;
550 /* Create an X86-64 ELF linker hash table. */
552 static struct bfd_link_hash_table
*
553 elf64_x86_64_link_hash_table_create (bfd
*abfd
)
555 struct elf64_x86_64_link_hash_table
*ret
;
556 bfd_size_type amt
= sizeof (struct elf64_x86_64_link_hash_table
);
558 ret
= (struct elf64_x86_64_link_hash_table
*) bfd_malloc (amt
);
562 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
, link_hash_newfunc
,
563 sizeof (struct elf64_x86_64_link_hash_entry
)))
576 ret
->sym_sec
.abfd
= NULL
;
577 ret
->tlsdesc_plt
= 0;
578 ret
->tlsdesc_got
= 0;
579 ret
->tls_ld_got
.refcount
= 0;
580 ret
->sgotplt_jump_table_size
= 0;
581 ret
->tls_module_base
= NULL
;
583 return &ret
->elf
.root
;
586 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
587 shortcuts to them in our hash table. */
590 create_got_section (bfd
*dynobj
, struct bfd_link_info
*info
)
592 struct elf64_x86_64_link_hash_table
*htab
;
594 if (! _bfd_elf_create_got_section (dynobj
, info
))
597 htab
= elf64_x86_64_hash_table (info
);
598 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
599 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
600 if (!htab
->sgot
|| !htab
->sgotplt
)
603 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rela.got",
604 (SEC_ALLOC
| SEC_LOAD
609 if (htab
->srelgot
== NULL
610 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 3))
615 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
616 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
620 elf64_x86_64_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
622 struct elf64_x86_64_link_hash_table
*htab
;
624 htab
= elf64_x86_64_hash_table (info
);
625 if (!htab
->sgot
&& !create_got_section (dynobj
, info
))
628 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
631 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
632 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
633 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
635 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
637 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
638 || (!info
->shared
&& !htab
->srelbss
))
644 /* Copy the extra info we tack onto an elf_link_hash_entry. */
647 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
648 struct elf_link_hash_entry
*dir
,
649 struct elf_link_hash_entry
*ind
)
651 struct elf64_x86_64_link_hash_entry
*edir
, *eind
;
653 edir
= (struct elf64_x86_64_link_hash_entry
*) dir
;
654 eind
= (struct elf64_x86_64_link_hash_entry
*) ind
;
656 if (eind
->dyn_relocs
!= NULL
)
658 if (edir
->dyn_relocs
!= NULL
)
660 struct elf64_x86_64_dyn_relocs
**pp
;
661 struct elf64_x86_64_dyn_relocs
*p
;
663 /* Add reloc counts against the indirect sym to the direct sym
664 list. Merge any entries against the same section. */
665 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
667 struct elf64_x86_64_dyn_relocs
*q
;
669 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
670 if (q
->sec
== p
->sec
)
672 q
->pc_count
+= p
->pc_count
;
673 q
->count
+= p
->count
;
680 *pp
= edir
->dyn_relocs
;
683 edir
->dyn_relocs
= eind
->dyn_relocs
;
684 eind
->dyn_relocs
= NULL
;
687 if (ind
->root
.type
== bfd_link_hash_indirect
688 && dir
->got
.refcount
<= 0)
690 edir
->tls_type
= eind
->tls_type
;
691 eind
->tls_type
= GOT_UNKNOWN
;
694 if (ELIMINATE_COPY_RELOCS
695 && ind
->root
.type
!= bfd_link_hash_indirect
696 && dir
->dynamic_adjusted
)
698 /* If called to transfer flags for a weakdef during processing
699 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
700 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
701 dir
->ref_dynamic
|= ind
->ref_dynamic
;
702 dir
->ref_regular
|= ind
->ref_regular
;
703 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
704 dir
->needs_plt
|= ind
->needs_plt
;
705 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
708 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
712 elf64_x86_64_elf_object_p (bfd
*abfd
)
714 /* Set the right machine number for an x86-64 elf64 file. */
715 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
733 /* Return TRUE if the TLS access code sequence support transition
737 elf64_x86_64_check_tls_transition (bfd
*abfd
, asection
*sec
,
739 Elf_Internal_Shdr
*symtab_hdr
,
740 struct elf_link_hash_entry
**sym_hashes
,
742 const Elf_Internal_Rela
*rel
,
743 const Elf_Internal_Rela
*relend
)
746 unsigned long r_symndx
;
747 struct elf_link_hash_entry
*h
;
750 /* Get the section contents. */
751 if (contents
== NULL
)
753 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
754 contents
= elf_section_data (sec
)->this_hdr
.contents
;
757 /* FIXME: How to better handle error condition? */
758 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
761 /* Cache the section contents for elf_link_input_bfd. */
762 elf_section_data (sec
)->this_hdr
.contents
= contents
;
766 offset
= rel
->r_offset
;
771 if ((rel
+ 1) >= relend
)
774 if (r_type
== R_X86_64_TLSGD
)
776 /* Check transition from GD access model. Only
777 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
778 .word 0x6666; rex64; call __tls_get_addr
779 can transit to different access model. */
781 static x86_64_opcode32 leaq
= { { 0x66, 0x48, 0x8d, 0x3d } },
782 call
= { { 0x66, 0x66, 0x48, 0xe8 } };
784 || (offset
+ 12) > sec
->size
785 || bfd_get_32 (abfd
, contents
+ offset
- 4) != leaq
.i
786 || bfd_get_32 (abfd
, contents
+ offset
+ 4) != call
.i
)
791 /* Check transition from LD access model. Only
792 leaq foo@tlsld(%rip), %rdi;
794 can transit to different access model. */
796 static x86_64_opcode32 ld
= { { 0x48, 0x8d, 0x3d, 0xe8 } };
799 if (offset
< 3 || (offset
+ 9) > sec
->size
)
802 op
.i
= bfd_get_32 (abfd
, contents
+ offset
- 3);
803 op
.c
[3] = bfd_get_8 (abfd
, contents
+ offset
+ 4);
808 r_symndx
= ELF64_R_SYM (rel
[1].r_info
);
809 if (r_symndx
< symtab_hdr
->sh_info
)
812 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
814 && h
->root
.root
.string
!= NULL
815 && (ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
816 || ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
817 && (strcmp (h
->root
.root
.string
, "__tls_get_addr") == 0));
819 case R_X86_64_GOTTPOFF
:
820 /* Check transition from IE access model:
821 movq foo@gottpoff(%rip), %reg
822 addq foo@gottpoff(%rip), %reg
825 if (offset
< 3 || (offset
+ 4) > sec
->size
)
828 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
829 if (val
!= 0x48 && val
!= 0x4c)
832 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
833 if (val
!= 0x8b && val
!= 0x03)
836 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
837 return (val
& 0xc7) == 5;
839 case R_X86_64_GOTPC32_TLSDESC
:
840 /* Check transition from GDesc access model:
841 leaq x@tlsdesc(%rip), %rax
843 Make sure it's a leaq adding rip to a 32-bit offset
844 into any register, although it's probably almost always
847 if (offset
< 3 || (offset
+ 4) > sec
->size
)
850 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
851 if ((val
& 0xfb) != 0x48)
854 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
857 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
858 return (val
& 0xc7) == 0x05;
860 case R_X86_64_TLSDESC_CALL
:
861 /* Check transition from GDesc access model:
862 call *x@tlsdesc(%rax)
864 if (offset
+ 2 <= sec
->size
)
866 /* Make sure that it's a call *x@tlsdesc(%rax). */
867 static x86_64_opcode16 call
= { { 0xff, 0x10 } };
868 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
878 /* Return TRUE if the TLS access transition is OK or no transition
879 will be performed. Update R_TYPE if there is a transition. */
882 elf64_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
883 asection
*sec
, bfd_byte
*contents
,
884 Elf_Internal_Shdr
*symtab_hdr
,
885 struct elf_link_hash_entry
**sym_hashes
,
886 unsigned int *r_type
, int tls_type
,
887 const Elf_Internal_Rela
*rel
,
888 const Elf_Internal_Rela
*relend
,
889 struct elf_link_hash_entry
*h
)
891 unsigned int from_type
= *r_type
;
892 unsigned int to_type
= from_type
;
893 bfd_boolean check
= TRUE
;
898 case R_X86_64_GOTPC32_TLSDESC
:
899 case R_X86_64_TLSDESC_CALL
:
900 case R_X86_64_GOTTPOFF
:
904 to_type
= R_X86_64_TPOFF32
;
906 to_type
= R_X86_64_GOTTPOFF
;
909 /* When we are called from elf64_x86_64_relocate_section,
910 CONTENTS isn't NULL and there may be additional transitions
911 based on TLS_TYPE. */
912 if (contents
!= NULL
)
914 unsigned int new_to_type
= to_type
;
919 && tls_type
== GOT_TLS_IE
)
920 new_to_type
= R_X86_64_TPOFF32
;
922 if (to_type
== R_X86_64_TLSGD
923 || to_type
== R_X86_64_GOTPC32_TLSDESC
924 || to_type
== R_X86_64_TLSDESC_CALL
)
926 if (tls_type
== GOT_TLS_IE
)
927 new_to_type
= R_X86_64_GOTTPOFF
;
930 /* We checked the transition before when we were called from
931 elf64_x86_64_check_relocs. We only want to check the new
932 transition which hasn't been checked before. */
933 check
= new_to_type
!= to_type
&& from_type
== to_type
;
934 to_type
= new_to_type
;
941 to_type
= R_X86_64_TPOFF32
;
948 /* Return TRUE if there is no transition. */
949 if (from_type
== to_type
)
952 /* Check if the transition can be performed. */
954 && ! elf64_x86_64_check_tls_transition (abfd
, sec
, contents
,
955 symtab_hdr
, sym_hashes
,
956 from_type
, rel
, relend
))
958 reloc_howto_type
*from
, *to
;
960 from
= elf64_x86_64_rtype_to_howto (abfd
, from_type
);
961 to
= elf64_x86_64_rtype_to_howto (abfd
, to_type
);
963 (*_bfd_error_handler
)
964 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
965 "in section `%A' failed"),
966 abfd
, sec
, from
->name
, to
->name
,
967 h
? h
->root
.root
.string
: "a local symbol",
968 (unsigned long) rel
->r_offset
);
969 bfd_set_error (bfd_error_bad_value
);
977 /* Returns true if the hash entry refers to a symbol
978 marked for indirect handling during reloc processing. */
981 is_indirect_symbol (bfd
* abfd
, struct elf_link_hash_entry
* h
)
983 const struct elf_backend_data
* bed
;
985 if (abfd
== NULL
|| h
== NULL
)
988 bed
= get_elf_backend_data (abfd
);
990 return h
->type
== STT_IFUNC
992 && (bed
->elf_osabi
== ELFOSABI_LINUX
993 /* GNU/Linux is still using the default value 0. */
994 || bed
->elf_osabi
== ELFOSABI_NONE
);
997 /* Look through the relocs for a section during the first phase, and
998 calculate needed space in the global offset table, procedure
999 linkage table, and dynamic reloc sections. */
1002 elf64_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1004 const Elf_Internal_Rela
*relocs
)
1006 struct elf64_x86_64_link_hash_table
*htab
;
1007 Elf_Internal_Shdr
*symtab_hdr
;
1008 struct elf_link_hash_entry
**sym_hashes
;
1009 const Elf_Internal_Rela
*rel
;
1010 const Elf_Internal_Rela
*rel_end
;
1013 if (info
->relocatable
)
1016 BFD_ASSERT (is_x86_64_elf (abfd
));
1018 htab
= elf64_x86_64_hash_table (info
);
1019 symtab_hdr
= &elf_symtab_hdr (abfd
);
1020 sym_hashes
= elf_sym_hashes (abfd
);
1024 rel_end
= relocs
+ sec
->reloc_count
;
1025 for (rel
= relocs
; rel
< rel_end
; rel
++)
1027 unsigned int r_type
;
1028 unsigned long r_symndx
;
1029 struct elf_link_hash_entry
*h
;
1031 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1032 r_type
= ELF64_R_TYPE (rel
->r_info
);
1034 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1036 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1041 if (r_symndx
< symtab_hdr
->sh_info
)
1045 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1046 while (h
->root
.type
== bfd_link_hash_indirect
1047 || h
->root
.type
== bfd_link_hash_warning
)
1048 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1051 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1052 symtab_hdr
, sym_hashes
,
1053 &r_type
, GOT_UNKNOWN
,
1059 case R_X86_64_TLSLD
:
1060 htab
->tls_ld_got
.refcount
+= 1;
1063 case R_X86_64_TPOFF32
:
1066 (*_bfd_error_handler
)
1067 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1069 x86_64_elf_howto_table
[r_type
].name
,
1070 (h
) ? h
->root
.root
.string
: "a local symbol");
1071 bfd_set_error (bfd_error_bad_value
);
1076 case R_X86_64_GOTTPOFF
:
1078 info
->flags
|= DF_STATIC_TLS
;
1081 case R_X86_64_GOT32
:
1082 case R_X86_64_GOTPCREL
:
1083 case R_X86_64_TLSGD
:
1084 case R_X86_64_GOT64
:
1085 case R_X86_64_GOTPCREL64
:
1086 case R_X86_64_GOTPLT64
:
1087 case R_X86_64_GOTPC32_TLSDESC
:
1088 case R_X86_64_TLSDESC_CALL
:
1089 /* This symbol requires a global offset table entry. */
1091 int tls_type
, old_tls_type
;
1095 default: tls_type
= GOT_NORMAL
; break;
1096 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1097 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1098 case R_X86_64_GOTPC32_TLSDESC
:
1099 case R_X86_64_TLSDESC_CALL
:
1100 tls_type
= GOT_TLS_GDESC
; break;
1105 if (r_type
== R_X86_64_GOTPLT64
)
1107 /* This relocation indicates that we also need
1108 a PLT entry, as this is a function. We don't need
1109 a PLT entry for local symbols. */
1111 h
->plt
.refcount
+= 1;
1113 h
->got
.refcount
+= 1;
1114 old_tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1118 bfd_signed_vma
*local_got_refcounts
;
1120 /* This is a global offset table entry for a local symbol. */
1121 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1122 if (local_got_refcounts
== NULL
)
1126 size
= symtab_hdr
->sh_info
;
1127 size
*= sizeof (bfd_signed_vma
)
1128 + sizeof (bfd_vma
) + sizeof (char);
1129 local_got_refcounts
= ((bfd_signed_vma
*)
1130 bfd_zalloc (abfd
, size
));
1131 if (local_got_refcounts
== NULL
)
1133 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1134 elf64_x86_64_local_tlsdesc_gotent (abfd
)
1135 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1136 elf64_x86_64_local_got_tls_type (abfd
)
1137 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1139 local_got_refcounts
[r_symndx
] += 1;
1141 = elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1144 /* If a TLS symbol is accessed using IE at least once,
1145 there is no point to use dynamic model for it. */
1146 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1147 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1148 || tls_type
!= GOT_TLS_IE
))
1150 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1151 tls_type
= old_tls_type
;
1152 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1153 && GOT_TLS_GD_ANY_P (tls_type
))
1154 tls_type
|= old_tls_type
;
1157 (*_bfd_error_handler
)
1158 (_("%B: '%s' accessed both as normal and thread local symbol"),
1159 abfd
, h
? h
->root
.root
.string
: "<local>");
1164 if (old_tls_type
!= tls_type
)
1167 elf64_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1169 elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1174 case R_X86_64_GOTOFF64
:
1175 case R_X86_64_GOTPC32
:
1176 case R_X86_64_GOTPC64
:
1178 if (htab
->sgot
== NULL
)
1180 if (htab
->elf
.dynobj
== NULL
)
1181 htab
->elf
.dynobj
= abfd
;
1182 if (!create_got_section (htab
->elf
.dynobj
, info
))
1187 case R_X86_64_PLT32
:
1188 /* This symbol requires a procedure linkage table entry. We
1189 actually build the entry in adjust_dynamic_symbol,
1190 because this might be a case of linking PIC code which is
1191 never referenced by a dynamic object, in which case we
1192 don't need to generate a procedure linkage table entry
1195 /* If this is a local symbol, we resolve it directly without
1196 creating a procedure linkage table entry. */
1201 h
->plt
.refcount
+= 1;
1204 case R_X86_64_PLTOFF64
:
1205 /* This tries to form the 'address' of a function relative
1206 to GOT. For global symbols we need a PLT entry. */
1210 h
->plt
.refcount
+= 1;
1218 /* Let's help debug shared library creation. These relocs
1219 cannot be used in shared libs. Don't error out for
1220 sections we don't care about, such as debug sections or
1221 non-constant sections. */
1223 && (sec
->flags
& SEC_ALLOC
) != 0
1224 && (sec
->flags
& SEC_READONLY
) != 0)
1226 (*_bfd_error_handler
)
1227 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1229 x86_64_elf_howto_table
[r_type
].name
,
1230 (h
) ? h
->root
.root
.string
: "a local symbol");
1231 bfd_set_error (bfd_error_bad_value
);
1241 if (h
!= NULL
&& !info
->shared
)
1243 /* If this reloc is in a read-only section, we might
1244 need a copy reloc. We can't check reliably at this
1245 stage whether the section is read-only, as input
1246 sections have not yet been mapped to output sections.
1247 Tentatively set the flag for now, and correct in
1248 adjust_dynamic_symbol. */
1251 /* We may need a .plt entry if the function this reloc
1252 refers to is in a shared lib. */
1253 h
->plt
.refcount
+= 1;
1254 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1255 h
->pointer_equality_needed
= 1;
1258 /* If we are creating a shared library, and this is a reloc
1259 against a global symbol, or a non PC relative reloc
1260 against a local symbol, then we need to copy the reloc
1261 into the shared library. However, if we are linking with
1262 -Bsymbolic, we do not need to copy a reloc against a
1263 global symbol which is defined in an object we are
1264 including in the link (i.e., DEF_REGULAR is set). At
1265 this point we have not seen all the input files, so it is
1266 possible that DEF_REGULAR is not set now but will be set
1267 later (it is never cleared). In case of a weak definition,
1268 DEF_REGULAR may be cleared later by a strong definition in
1269 a shared library. We account for that possibility below by
1270 storing information in the relocs_copied field of the hash
1271 table entry. A similar situation occurs when creating
1272 shared libraries and symbol visibility changes render the
1275 If on the other hand, we are creating an executable, we
1276 may need to keep relocations for symbols satisfied by a
1277 dynamic library if we manage to avoid copy relocs for the
1280 Also we must keep any relocations against IFUNC symbols as
1281 they will be evaluated at load time. */
1283 && (sec
->flags
& SEC_ALLOC
) != 0
1284 && (((r_type
!= R_X86_64_PC8
)
1285 && (r_type
!= R_X86_64_PC16
)
1286 && (r_type
!= R_X86_64_PC32
)
1287 && (r_type
!= R_X86_64_PC64
))
1289 && (! SYMBOLIC_BIND (info
, h
)
1290 || h
->root
.type
== bfd_link_hash_defweak
1291 || !h
->def_regular
))))
1292 || (ELIMINATE_COPY_RELOCS
1294 && (sec
->flags
& SEC_ALLOC
) != 0
1296 && (h
->root
.type
== bfd_link_hash_defweak
1297 || !h
->def_regular
))
1298 || is_indirect_symbol (abfd
, h
))
1300 struct elf64_x86_64_dyn_relocs
*p
;
1301 struct elf64_x86_64_dyn_relocs
**head
;
1303 /* We must copy these reloc types into the output file.
1304 Create a reloc section in dynobj and make room for
1308 if (htab
->elf
.dynobj
== NULL
)
1309 htab
->elf
.dynobj
= abfd
;
1311 sreloc
= _bfd_elf_make_dynamic_reloc_section
1312 (sec
, htab
->elf
.dynobj
, 3, abfd
, /*rela?*/ TRUE
);
1318 if (is_indirect_symbol (abfd
, h
))
1319 (void) _bfd_elf_make_ifunc_reloc_section (abfd
, sec
, htab
->elf
.dynobj
, 2);
1321 /* If this is a global symbol, we count the number of
1322 relocations we need for this symbol. */
1325 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1330 /* Track dynamic relocs needed for local syms too.
1331 We really need local syms available to do this
1335 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1340 /* Beware of type punned pointers vs strict aliasing
1342 vpp
= &(elf_section_data (s
)->local_dynrel
);
1343 head
= (struct elf64_x86_64_dyn_relocs
**)vpp
;
1347 if (p
== NULL
|| p
->sec
!= sec
)
1349 bfd_size_type amt
= sizeof *p
;
1350 p
= ((struct elf64_x86_64_dyn_relocs
*)
1351 bfd_alloc (htab
->elf
.dynobj
, amt
));
1362 if (r_type
== R_X86_64_PC8
1363 || r_type
== R_X86_64_PC16
1364 || r_type
== R_X86_64_PC32
1365 || r_type
== R_X86_64_PC64
)
1370 /* This relocation describes the C++ object vtable hierarchy.
1371 Reconstruct it for later use during GC. */
1372 case R_X86_64_GNU_VTINHERIT
:
1373 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1377 /* This relocation describes which C++ vtable entries are actually
1378 used. Record for later use during GC. */
1379 case R_X86_64_GNU_VTENTRY
:
1380 BFD_ASSERT (h
!= NULL
);
1382 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1394 /* Return the section that should be marked against GC for a given
1398 elf64_x86_64_gc_mark_hook (asection
*sec
,
1399 struct bfd_link_info
*info
,
1400 Elf_Internal_Rela
*rel
,
1401 struct elf_link_hash_entry
*h
,
1402 Elf_Internal_Sym
*sym
)
1405 switch (ELF64_R_TYPE (rel
->r_info
))
1407 case R_X86_64_GNU_VTINHERIT
:
1408 case R_X86_64_GNU_VTENTRY
:
1412 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1415 /* Update the got entry reference counts for the section being removed. */
1418 elf64_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1420 const Elf_Internal_Rela
*relocs
)
1422 Elf_Internal_Shdr
*symtab_hdr
;
1423 struct elf_link_hash_entry
**sym_hashes
;
1424 bfd_signed_vma
*local_got_refcounts
;
1425 const Elf_Internal_Rela
*rel
, *relend
;
1427 if (info
->relocatable
)
1430 elf_section_data (sec
)->local_dynrel
= NULL
;
1432 symtab_hdr
= &elf_symtab_hdr (abfd
);
1433 sym_hashes
= elf_sym_hashes (abfd
);
1434 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1436 relend
= relocs
+ sec
->reloc_count
;
1437 for (rel
= relocs
; rel
< relend
; rel
++)
1439 unsigned long r_symndx
;
1440 unsigned int r_type
;
1441 struct elf_link_hash_entry
*h
= NULL
;
1443 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1444 if (r_symndx
>= symtab_hdr
->sh_info
)
1446 struct elf64_x86_64_link_hash_entry
*eh
;
1447 struct elf64_x86_64_dyn_relocs
**pp
;
1448 struct elf64_x86_64_dyn_relocs
*p
;
1450 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1451 while (h
->root
.type
== bfd_link_hash_indirect
1452 || h
->root
.type
== bfd_link_hash_warning
)
1453 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1454 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1456 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1459 /* Everything must go for SEC. */
1465 r_type
= ELF64_R_TYPE (rel
->r_info
);
1466 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1467 symtab_hdr
, sym_hashes
,
1468 &r_type
, GOT_UNKNOWN
,
1474 case R_X86_64_TLSLD
:
1475 if (elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
> 0)
1476 elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
-= 1;
1479 case R_X86_64_TLSGD
:
1480 case R_X86_64_GOTPC32_TLSDESC
:
1481 case R_X86_64_TLSDESC_CALL
:
1482 case R_X86_64_GOTTPOFF
:
1483 case R_X86_64_GOT32
:
1484 case R_X86_64_GOTPCREL
:
1485 case R_X86_64_GOT64
:
1486 case R_X86_64_GOTPCREL64
:
1487 case R_X86_64_GOTPLT64
:
1490 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1491 h
->plt
.refcount
-= 1;
1492 if (h
->got
.refcount
> 0)
1493 h
->got
.refcount
-= 1;
1495 else if (local_got_refcounts
!= NULL
)
1497 if (local_got_refcounts
[r_symndx
] > 0)
1498 local_got_refcounts
[r_symndx
] -= 1;
1515 case R_X86_64_PLT32
:
1516 case R_X86_64_PLTOFF64
:
1519 if (h
->plt
.refcount
> 0)
1520 h
->plt
.refcount
-= 1;
1532 /* Adjust a symbol defined by a dynamic object and referenced by a
1533 regular object. The current definition is in some section of the
1534 dynamic object, but we're not including those sections. We have to
1535 change the definition to something the rest of the link can
1539 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1540 struct elf_link_hash_entry
*h
)
1542 struct elf64_x86_64_link_hash_table
*htab
;
1545 /* If this is a function, put it in the procedure linkage table. We
1546 will fill in the contents of the procedure linkage table later,
1547 when we know the address of the .got section. */
1548 if (h
->type
== STT_FUNC
1551 if (h
->plt
.refcount
<= 0
1552 || SYMBOL_CALLS_LOCAL (info
, h
)
1553 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1554 && h
->root
.type
== bfd_link_hash_undefweak
))
1556 /* This case can occur if we saw a PLT32 reloc in an input
1557 file, but the symbol was never referred to by a dynamic
1558 object, or if all references were garbage collected. In
1559 such a case, we don't actually need to build a procedure
1560 linkage table, and we can just do a PC32 reloc instead. */
1561 h
->plt
.offset
= (bfd_vma
) -1;
1568 /* It's possible that we incorrectly decided a .plt reloc was
1569 needed for an R_X86_64_PC32 reloc to a non-function sym in
1570 check_relocs. We can't decide accurately between function and
1571 non-function syms in check-relocs; Objects loaded later in
1572 the link may change h->type. So fix it now. */
1573 h
->plt
.offset
= (bfd_vma
) -1;
1575 /* If this is a weak symbol, and there is a real definition, the
1576 processor independent code will have arranged for us to see the
1577 real definition first, and we can just use the same value. */
1578 if (h
->u
.weakdef
!= NULL
)
1580 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1581 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1582 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1583 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1584 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1585 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1589 /* This is a reference to a symbol defined by a dynamic object which
1590 is not a function. */
1592 /* If we are creating a shared library, we must presume that the
1593 only references to the symbol are via the global offset table.
1594 For such cases we need not do anything here; the relocations will
1595 be handled correctly by relocate_section. */
1599 /* If there are no references to this symbol that do not use the
1600 GOT, we don't need to generate a copy reloc. */
1601 if (!h
->non_got_ref
)
1604 /* If -z nocopyreloc was given, we won't generate them either. */
1605 if (info
->nocopyreloc
)
1611 if (ELIMINATE_COPY_RELOCS
)
1613 struct elf64_x86_64_link_hash_entry
* eh
;
1614 struct elf64_x86_64_dyn_relocs
*p
;
1616 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1617 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1619 s
= p
->sec
->output_section
;
1620 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1624 /* If we didn't find any dynamic relocs in read-only sections, then
1625 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1635 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1636 h
->root
.root
.string
);
1640 /* We must allocate the symbol in our .dynbss section, which will
1641 become part of the .bss section of the executable. There will be
1642 an entry for this symbol in the .dynsym section. The dynamic
1643 object will contain position independent code, so all references
1644 from the dynamic object to this symbol will go through the global
1645 offset table. The dynamic linker will use the .dynsym entry to
1646 determine the address it must put in the global offset table, so
1647 both the dynamic object and the regular object will refer to the
1648 same memory location for the variable. */
1650 htab
= elf64_x86_64_hash_table (info
);
1652 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1653 to copy the initial value out of the dynamic object and into the
1654 runtime process image. */
1655 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1657 htab
->srelbss
->size
+= sizeof (Elf64_External_Rela
);
1663 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1666 /* Allocate space in .plt, .got and associated reloc sections for
1670 allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1672 struct bfd_link_info
*info
;
1673 struct elf64_x86_64_link_hash_table
*htab
;
1674 struct elf64_x86_64_link_hash_entry
*eh
;
1675 struct elf64_x86_64_dyn_relocs
*p
;
1677 if (h
->root
.type
== bfd_link_hash_indirect
)
1680 if (h
->root
.type
== bfd_link_hash_warning
)
1681 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1683 info
= (struct bfd_link_info
*) inf
;
1684 htab
= elf64_x86_64_hash_table (info
);
1686 if (htab
->elf
.dynamic_sections_created
1687 && h
->plt
.refcount
> 0)
1689 /* Make sure this symbol is output as a dynamic symbol.
1690 Undefined weak syms won't yet be marked as dynamic. */
1691 if (h
->dynindx
== -1
1692 && !h
->forced_local
)
1694 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1699 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1701 asection
*s
= htab
->splt
;
1703 /* If this is the first .plt entry, make room for the special
1706 s
->size
+= PLT_ENTRY_SIZE
;
1708 h
->plt
.offset
= s
->size
;
1710 /* If this symbol is not defined in a regular file, and we are
1711 not generating a shared library, then set the symbol to this
1712 location in the .plt. This is required to make function
1713 pointers compare as equal between the normal executable and
1714 the shared library. */
1718 h
->root
.u
.def
.section
= s
;
1719 h
->root
.u
.def
.value
= h
->plt
.offset
;
1722 /* Make room for this entry. */
1723 s
->size
+= PLT_ENTRY_SIZE
;
1725 /* We also need to make an entry in the .got.plt section, which
1726 will be placed in the .got section by the linker script. */
1727 htab
->sgotplt
->size
+= GOT_ENTRY_SIZE
;
1729 /* We also need to make an entry in the .rela.plt section. */
1730 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
1731 htab
->srelplt
->reloc_count
++;
1735 h
->plt
.offset
= (bfd_vma
) -1;
1741 h
->plt
.offset
= (bfd_vma
) -1;
1745 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1746 eh
->tlsdesc_got
= (bfd_vma
) -1;
1748 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1749 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1750 if (h
->got
.refcount
> 0
1753 && elf64_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
1754 h
->got
.offset
= (bfd_vma
) -1;
1755 else if (h
->got
.refcount
> 0)
1759 int tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1761 /* Make sure this symbol is output as a dynamic symbol.
1762 Undefined weak syms won't yet be marked as dynamic. */
1763 if (h
->dynindx
== -1
1764 && !h
->forced_local
)
1766 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1770 if (GOT_TLS_GDESC_P (tls_type
))
1772 eh
->tlsdesc_got
= htab
->sgotplt
->size
1773 - elf64_x86_64_compute_jump_table_size (htab
);
1774 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
1775 h
->got
.offset
= (bfd_vma
) -2;
1777 if (! GOT_TLS_GDESC_P (tls_type
)
1778 || GOT_TLS_GD_P (tls_type
))
1781 h
->got
.offset
= s
->size
;
1782 s
->size
+= GOT_ENTRY_SIZE
;
1783 if (GOT_TLS_GD_P (tls_type
))
1784 s
->size
+= GOT_ENTRY_SIZE
;
1786 dyn
= htab
->elf
.dynamic_sections_created
;
1787 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1789 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1790 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
1791 || tls_type
== GOT_TLS_IE
)
1792 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
1793 else if (GOT_TLS_GD_P (tls_type
))
1794 htab
->srelgot
->size
+= 2 * sizeof (Elf64_External_Rela
);
1795 else if (! GOT_TLS_GDESC_P (tls_type
)
1796 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1797 || h
->root
.type
!= bfd_link_hash_undefweak
)
1799 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
1800 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
1801 if (GOT_TLS_GDESC_P (tls_type
))
1803 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
1804 htab
->tlsdesc_plt
= (bfd_vma
) -1;
1808 h
->got
.offset
= (bfd_vma
) -1;
1810 if (eh
->dyn_relocs
== NULL
)
1813 /* In the shared -Bsymbolic case, discard space allocated for
1814 dynamic pc-relative relocs against symbols which turn out to be
1815 defined in regular objects. For the normal shared case, discard
1816 space for pc-relative relocs that have become local due to symbol
1817 visibility changes. */
1821 /* Relocs that use pc_count are those that appear on a call
1822 insn, or certain REL relocs that can generated via assembly.
1823 We want calls to protected symbols to resolve directly to the
1824 function rather than going via the plt. If people want
1825 function pointer comparisons to work as expected then they
1826 should avoid writing weird assembly. */
1827 if (SYMBOL_CALLS_LOCAL (info
, h
))
1829 struct elf64_x86_64_dyn_relocs
**pp
;
1831 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1833 p
->count
-= p
->pc_count
;
1842 /* Also discard relocs on undefined weak syms with non-default
1844 if (eh
->dyn_relocs
!= NULL
1845 && h
->root
.type
== bfd_link_hash_undefweak
)
1847 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
1848 eh
->dyn_relocs
= NULL
;
1850 /* Make sure undefined weak symbols are output as a dynamic
1852 else if (h
->dynindx
== -1
1853 && !h
->forced_local
)
1855 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1860 else if (is_indirect_symbol (info
->output_bfd
, h
))
1862 if (h
->dynindx
== -1
1863 && ! h
->forced_local
1864 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
1867 else if (ELIMINATE_COPY_RELOCS
)
1869 /* For the non-shared case, discard space for relocs against
1870 symbols which turn out to need copy relocs or are not
1876 || (htab
->elf
.dynamic_sections_created
1877 && (h
->root
.type
== bfd_link_hash_undefweak
1878 || h
->root
.type
== bfd_link_hash_undefined
))))
1880 /* Make sure this symbol is output as a dynamic symbol.
1881 Undefined weak syms won't yet be marked as dynamic. */
1882 if (h
->dynindx
== -1
1883 && !h
->forced_local
)
1885 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1889 /* If that succeeded, we know we'll be keeping all the
1891 if (h
->dynindx
!= -1)
1895 eh
->dyn_relocs
= NULL
;
1900 /* Finally, allocate space. */
1901 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1906 && is_indirect_symbol (info
->output_bfd
, h
))
1907 sreloc
= elf_section_data (p
->sec
)->indirect_relocs
;
1909 sreloc
= elf_section_data (p
->sec
)->sreloc
;
1911 BFD_ASSERT (sreloc
!= NULL
);
1913 sreloc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
1919 /* Find any dynamic relocs that apply to read-only sections. */
1922 readonly_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1924 struct elf64_x86_64_link_hash_entry
*eh
;
1925 struct elf64_x86_64_dyn_relocs
*p
;
1927 if (h
->root
.type
== bfd_link_hash_warning
)
1928 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1930 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1931 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1933 asection
*s
= p
->sec
->output_section
;
1935 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1937 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
1939 info
->flags
|= DF_TEXTREL
;
1941 /* Not an error, just cut short the traversal. */
1948 /* Set the sizes of the dynamic sections. */
1951 elf64_x86_64_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1952 struct bfd_link_info
*info
)
1954 struct elf64_x86_64_link_hash_table
*htab
;
1960 htab
= elf64_x86_64_hash_table (info
);
1961 dynobj
= htab
->elf
.dynobj
;
1965 if (htab
->elf
.dynamic_sections_created
)
1967 /* Set the contents of the .interp section to the interpreter. */
1968 if (info
->executable
)
1970 s
= bfd_get_section_by_name (dynobj
, ".interp");
1973 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1974 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1978 /* Set up .got offsets for local syms, and space for local dynamic
1980 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
1982 bfd_signed_vma
*local_got
;
1983 bfd_signed_vma
*end_local_got
;
1984 char *local_tls_type
;
1985 bfd_vma
*local_tlsdesc_gotent
;
1986 bfd_size_type locsymcount
;
1987 Elf_Internal_Shdr
*symtab_hdr
;
1990 if (! is_x86_64_elf (ibfd
))
1993 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
1995 struct elf64_x86_64_dyn_relocs
*p
;
1997 for (p
= (struct elf64_x86_64_dyn_relocs
*)
1998 (elf_section_data (s
)->local_dynrel
);
2002 if (!bfd_is_abs_section (p
->sec
)
2003 && bfd_is_abs_section (p
->sec
->output_section
))
2005 /* Input section has been discarded, either because
2006 it is a copy of a linkonce section or due to
2007 linker script /DISCARD/, so we'll be discarding
2010 else if (p
->count
!= 0)
2012 srel
= elf_section_data (p
->sec
)->sreloc
;
2013 srel
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2014 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2015 info
->flags
|= DF_TEXTREL
;
2020 local_got
= elf_local_got_refcounts (ibfd
);
2024 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2025 locsymcount
= symtab_hdr
->sh_info
;
2026 end_local_got
= local_got
+ locsymcount
;
2027 local_tls_type
= elf64_x86_64_local_got_tls_type (ibfd
);
2028 local_tlsdesc_gotent
= elf64_x86_64_local_tlsdesc_gotent (ibfd
);
2030 srel
= htab
->srelgot
;
2031 for (; local_got
< end_local_got
;
2032 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2034 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2037 if (GOT_TLS_GDESC_P (*local_tls_type
))
2039 *local_tlsdesc_gotent
= htab
->sgotplt
->size
2040 - elf64_x86_64_compute_jump_table_size (htab
);
2041 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2042 *local_got
= (bfd_vma
) -2;
2044 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2045 || GOT_TLS_GD_P (*local_tls_type
))
2047 *local_got
= s
->size
;
2048 s
->size
+= GOT_ENTRY_SIZE
;
2049 if (GOT_TLS_GD_P (*local_tls_type
))
2050 s
->size
+= GOT_ENTRY_SIZE
;
2053 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2054 || *local_tls_type
== GOT_TLS_IE
)
2056 if (GOT_TLS_GDESC_P (*local_tls_type
))
2058 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
2059 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2061 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2062 || GOT_TLS_GD_P (*local_tls_type
))
2063 srel
->size
+= sizeof (Elf64_External_Rela
);
2067 *local_got
= (bfd_vma
) -1;
2071 if (htab
->tls_ld_got
.refcount
> 0)
2073 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2075 htab
->tls_ld_got
.offset
= htab
->sgot
->size
;
2076 htab
->sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2077 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2080 htab
->tls_ld_got
.offset
= -1;
2082 /* Allocate global sym .plt and .got entries, and space for global
2083 sym dynamic relocs. */
2084 elf_link_hash_traverse (&htab
->elf
, allocate_dynrelocs
, info
);
2086 /* For every jump slot reserved in the sgotplt, reloc_count is
2087 incremented. However, when we reserve space for TLS descriptors,
2088 it's not incremented, so in order to compute the space reserved
2089 for them, it suffices to multiply the reloc count by the jump
2092 htab
->sgotplt_jump_table_size
2093 = elf64_x86_64_compute_jump_table_size (htab
);
2095 if (htab
->tlsdesc_plt
)
2097 /* If we're not using lazy TLS relocations, don't generate the
2098 PLT and GOT entries they require. */
2099 if ((info
->flags
& DF_BIND_NOW
))
2100 htab
->tlsdesc_plt
= 0;
2103 htab
->tlsdesc_got
= htab
->sgot
->size
;
2104 htab
->sgot
->size
+= GOT_ENTRY_SIZE
;
2105 /* Reserve room for the initial entry.
2106 FIXME: we could probably do away with it in this case. */
2107 if (htab
->splt
->size
== 0)
2108 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
2109 htab
->tlsdesc_plt
= htab
->splt
->size
;
2110 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
2114 /* We now have determined the sizes of the various dynamic sections.
2115 Allocate memory for them. */
2117 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2119 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2124 || s
== htab
->sgotplt
2125 || s
== htab
->sdynbss
)
2127 /* Strip this section if we don't need it; see the
2130 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2132 if (s
->size
!= 0 && s
!= htab
->srelplt
)
2135 /* We use the reloc_count field as a counter if we need
2136 to copy relocs into the output file. */
2137 if (s
!= htab
->srelplt
)
2142 /* It's not one of our sections, so don't allocate space. */
2148 /* If we don't need this section, strip it from the
2149 output file. This is mostly to handle .rela.bss and
2150 .rela.plt. We must create both sections in
2151 create_dynamic_sections, because they must be created
2152 before the linker maps input sections to output
2153 sections. The linker does that before
2154 adjust_dynamic_symbol is called, and it is that
2155 function which decides whether anything needs to go
2156 into these sections. */
2158 s
->flags
|= SEC_EXCLUDE
;
2162 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2165 /* Allocate memory for the section contents. We use bfd_zalloc
2166 here in case unused entries are not reclaimed before the
2167 section's contents are written out. This should not happen,
2168 but this way if it does, we get a R_X86_64_NONE reloc instead
2170 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2171 if (s
->contents
== NULL
)
2175 if (htab
->elf
.dynamic_sections_created
)
2177 /* Add some entries to the .dynamic section. We fill in the
2178 values later, in elf64_x86_64_finish_dynamic_sections, but we
2179 must add the entries now so that we get the correct size for
2180 the .dynamic section. The DT_DEBUG entry is filled in by the
2181 dynamic linker and used by the debugger. */
2182 #define add_dynamic_entry(TAG, VAL) \
2183 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2185 if (info
->executable
)
2187 if (!add_dynamic_entry (DT_DEBUG
, 0))
2191 if (htab
->splt
->size
!= 0)
2193 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2194 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2195 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2196 || !add_dynamic_entry (DT_JMPREL
, 0))
2199 if (htab
->tlsdesc_plt
2200 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2201 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2207 if (!add_dynamic_entry (DT_RELA
, 0)
2208 || !add_dynamic_entry (DT_RELASZ
, 0)
2209 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf64_External_Rela
)))
2212 /* If any dynamic relocs apply to a read-only section,
2213 then we need a DT_TEXTREL entry. */
2214 if ((info
->flags
& DF_TEXTREL
) == 0)
2215 elf_link_hash_traverse (&htab
->elf
, readonly_dynrelocs
, info
);
2217 if ((info
->flags
& DF_TEXTREL
) != 0)
2219 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2224 #undef add_dynamic_entry
2230 elf64_x86_64_always_size_sections (bfd
*output_bfd
,
2231 struct bfd_link_info
*info
)
2233 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2237 struct elf_link_hash_entry
*tlsbase
;
2239 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2240 "_TLS_MODULE_BASE_",
2241 FALSE
, FALSE
, FALSE
);
2243 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2245 struct bfd_link_hash_entry
*bh
= NULL
;
2246 const struct elf_backend_data
*bed
2247 = get_elf_backend_data (output_bfd
);
2249 if (!(_bfd_generic_link_add_one_symbol
2250 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2251 tls_sec
, 0, NULL
, FALSE
,
2252 bed
->collect
, &bh
)))
2255 elf64_x86_64_hash_table (info
)->tls_module_base
= bh
;
2257 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2258 tlsbase
->def_regular
= 1;
2259 tlsbase
->other
= STV_HIDDEN
;
2260 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2267 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2268 executables. Rather than setting it to the beginning of the TLS
2269 section, we have to set it to the end. This function may be called
2270 multiple times, it is idempotent. */
2273 set_tls_module_base (struct bfd_link_info
*info
)
2275 struct bfd_link_hash_entry
*base
;
2277 if (!info
->executable
)
2280 base
= elf64_x86_64_hash_table (info
)->tls_module_base
;
2285 base
->u
.def
.value
= elf_hash_table (info
)->tls_size
;
2288 /* Return the base VMA address which should be subtracted from real addresses
2289 when resolving @dtpoff relocation.
2290 This is PT_TLS segment p_vaddr. */
2293 dtpoff_base (struct bfd_link_info
*info
)
2295 /* If tls_sec is NULL, we should have signalled an error already. */
2296 if (elf_hash_table (info
)->tls_sec
== NULL
)
2298 return elf_hash_table (info
)->tls_sec
->vma
;
2301 /* Return the relocation value for @tpoff relocation
2302 if STT_TLS virtual address is ADDRESS. */
2305 tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2307 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2309 /* If tls_segment is NULL, we should have signalled an error already. */
2310 if (htab
->tls_sec
== NULL
)
2312 return address
- htab
->tls_size
- htab
->tls_sec
->vma
;
2315 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2319 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2321 /* Opcode Instruction
2324 0x0f 0x8x conditional jump */
2326 && (contents
[offset
- 1] == 0xe8
2327 || contents
[offset
- 1] == 0xe9))
2329 && contents
[offset
- 2] == 0x0f
2330 && (contents
[offset
- 1] & 0xf0) == 0x80));
2333 /* Relocate an x86_64 ELF section. */
2336 elf64_x86_64_relocate_section (bfd
*output_bfd
, struct bfd_link_info
*info
,
2337 bfd
*input_bfd
, asection
*input_section
,
2338 bfd_byte
*contents
, Elf_Internal_Rela
*relocs
,
2339 Elf_Internal_Sym
*local_syms
,
2340 asection
**local_sections
)
2342 struct elf64_x86_64_link_hash_table
*htab
;
2343 Elf_Internal_Shdr
*symtab_hdr
;
2344 struct elf_link_hash_entry
**sym_hashes
;
2345 bfd_vma
*local_got_offsets
;
2346 bfd_vma
*local_tlsdesc_gotents
;
2347 Elf_Internal_Rela
*rel
;
2348 Elf_Internal_Rela
*relend
;
2350 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2352 htab
= elf64_x86_64_hash_table (info
);
2353 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2354 sym_hashes
= elf_sym_hashes (input_bfd
);
2355 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2356 local_tlsdesc_gotents
= elf64_x86_64_local_tlsdesc_gotent (input_bfd
);
2358 set_tls_module_base (info
);
2361 relend
= relocs
+ input_section
->reloc_count
;
2362 for (; rel
< relend
; rel
++)
2364 unsigned int r_type
;
2365 reloc_howto_type
*howto
;
2366 unsigned long r_symndx
;
2367 struct elf_link_hash_entry
*h
;
2368 Elf_Internal_Sym
*sym
;
2370 bfd_vma off
, offplt
;
2372 bfd_boolean unresolved_reloc
;
2373 bfd_reloc_status_type r
;
2376 r_type
= ELF64_R_TYPE (rel
->r_info
);
2377 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2378 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2381 if (r_type
>= R_X86_64_max
)
2383 bfd_set_error (bfd_error_bad_value
);
2387 howto
= x86_64_elf_howto_table
+ r_type
;
2388 r_symndx
= ELF64_R_SYM (rel
->r_info
);
2392 unresolved_reloc
= FALSE
;
2393 if (r_symndx
< symtab_hdr
->sh_info
)
2395 sym
= local_syms
+ r_symndx
;
2396 sec
= local_sections
[r_symndx
];
2398 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2404 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2405 r_symndx
, symtab_hdr
, sym_hashes
,
2407 unresolved_reloc
, warned
);
2410 if (sec
!= NULL
&& elf_discarded_section (sec
))
2412 /* For relocs against symbols from removed linkonce sections,
2413 or sections discarded by a linker script, we just want the
2414 section contents zeroed. Avoid any special processing. */
2415 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2421 if (info
->relocatable
)
2424 /* When generating a shared object, the relocations handled here are
2425 copied into the output file to be resolved at run time. */
2429 case R_X86_64_GOT32
:
2430 case R_X86_64_GOT64
:
2431 /* Relocation is to the entry for this symbol in the global
2433 case R_X86_64_GOTPCREL
:
2434 case R_X86_64_GOTPCREL64
:
2435 /* Use global offset table entry as symbol value. */
2436 case R_X86_64_GOTPLT64
:
2437 /* This is the same as GOT64 for relocation purposes, but
2438 indicates the existence of a PLT entry. The difficulty is,
2439 that we must calculate the GOT slot offset from the PLT
2440 offset, if this symbol got a PLT entry (it was global).
2441 Additionally if it's computed from the PLT entry, then that
2442 GOT offset is relative to .got.plt, not to .got. */
2443 base_got
= htab
->sgot
;
2445 if (htab
->sgot
== NULL
)
2452 off
= h
->got
.offset
;
2454 && h
->plt
.offset
!= (bfd_vma
)-1
2455 && off
== (bfd_vma
)-1)
2457 /* We can't use h->got.offset here to save
2458 state, or even just remember the offset, as
2459 finish_dynamic_symbol would use that as offset into
2461 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2462 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2463 base_got
= htab
->sgotplt
;
2466 dyn
= htab
->elf
.dynamic_sections_created
;
2468 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
2470 && SYMBOL_REFERENCES_LOCAL (info
, h
))
2471 || (ELF_ST_VISIBILITY (h
->other
)
2472 && h
->root
.type
== bfd_link_hash_undefweak
))
2474 /* This is actually a static link, or it is a -Bsymbolic
2475 link and the symbol is defined locally, or the symbol
2476 was forced to be local because of a version file. We
2477 must initialize this entry in the global offset table.
2478 Since the offset must always be a multiple of 8, we
2479 use the least significant bit to record whether we
2480 have initialized it already.
2482 When doing a dynamic link, we create a .rela.got
2483 relocation entry to initialize the value. This is
2484 done in the finish_dynamic_symbol routine. */
2489 bfd_put_64 (output_bfd
, relocation
,
2490 base_got
->contents
+ off
);
2491 /* Note that this is harmless for the GOTPLT64 case,
2492 as -1 | 1 still is -1. */
2497 unresolved_reloc
= FALSE
;
2501 if (local_got_offsets
== NULL
)
2504 off
= local_got_offsets
[r_symndx
];
2506 /* The offset must always be a multiple of 8. We use
2507 the least significant bit to record whether we have
2508 already generated the necessary reloc. */
2513 bfd_put_64 (output_bfd
, relocation
,
2514 base_got
->contents
+ off
);
2519 Elf_Internal_Rela outrel
;
2522 /* We need to generate a R_X86_64_RELATIVE reloc
2523 for the dynamic linker. */
2528 outrel
.r_offset
= (base_got
->output_section
->vma
2529 + base_got
->output_offset
2531 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
2532 outrel
.r_addend
= relocation
;
2534 loc
+= s
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2535 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2538 local_got_offsets
[r_symndx
] |= 1;
2542 if (off
>= (bfd_vma
) -2)
2545 relocation
= base_got
->output_section
->vma
2546 + base_got
->output_offset
+ off
;
2547 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
2548 relocation
-= htab
->sgotplt
->output_section
->vma
2549 - htab
->sgotplt
->output_offset
;
2553 case R_X86_64_GOTOFF64
:
2554 /* Relocation is relative to the start of the global offset
2557 /* Check to make sure it isn't a protected function symbol
2558 for shared library since it may not be local when used
2559 as function address. */
2563 && h
->type
== STT_FUNC
2564 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
2566 (*_bfd_error_handler
)
2567 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
2568 input_bfd
, h
->root
.root
.string
);
2569 bfd_set_error (bfd_error_bad_value
);
2573 /* Note that sgot is not involved in this
2574 calculation. We always want the start of .got.plt. If we
2575 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2576 permitted by the ABI, we might have to change this
2578 relocation
-= htab
->sgotplt
->output_section
->vma
2579 + htab
->sgotplt
->output_offset
;
2582 case R_X86_64_GOTPC32
:
2583 case R_X86_64_GOTPC64
:
2584 /* Use global offset table as symbol value. */
2585 relocation
= htab
->sgotplt
->output_section
->vma
2586 + htab
->sgotplt
->output_offset
;
2587 unresolved_reloc
= FALSE
;
2590 case R_X86_64_PLTOFF64
:
2591 /* Relocation is PLT entry relative to GOT. For local
2592 symbols it's the symbol itself relative to GOT. */
2594 /* See PLT32 handling. */
2595 && h
->plt
.offset
!= (bfd_vma
) -1
2596 && htab
->splt
!= NULL
)
2598 relocation
= (htab
->splt
->output_section
->vma
2599 + htab
->splt
->output_offset
2601 unresolved_reloc
= FALSE
;
2604 relocation
-= htab
->sgotplt
->output_section
->vma
2605 + htab
->sgotplt
->output_offset
;
2608 case R_X86_64_PLT32
:
2609 /* Relocation is to the entry for this symbol in the
2610 procedure linkage table. */
2612 /* Resolve a PLT32 reloc against a local symbol directly,
2613 without using the procedure linkage table. */
2617 if (h
->plt
.offset
== (bfd_vma
) -1
2618 || htab
->splt
== NULL
)
2620 /* We didn't make a PLT entry for this symbol. This
2621 happens when statically linking PIC code, or when
2622 using -Bsymbolic. */
2626 relocation
= (htab
->splt
->output_section
->vma
2627 + htab
->splt
->output_offset
2629 unresolved_reloc
= FALSE
;
2636 && (input_section
->flags
& SEC_ALLOC
) != 0
2637 && (input_section
->flags
& SEC_READONLY
) != 0
2640 bfd_boolean fail
= FALSE
;
2642 = (r_type
== R_X86_64_PC32
2643 && is_32bit_relative_branch (contents
, rel
->r_offset
));
2645 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
2647 /* Symbol is referenced locally. Make sure it is
2648 defined locally or for a branch. */
2649 fail
= !h
->def_regular
&& !branch
;
2653 /* Symbol isn't referenced locally. We only allow
2654 branch to symbol with non-default visibility. */
2656 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
2663 const char *pic
= "";
2665 switch (ELF_ST_VISIBILITY (h
->other
))
2668 v
= _("hidden symbol");
2671 v
= _("internal symbol");
2674 v
= _("protected symbol");
2678 pic
= _("; recompile with -fPIC");
2683 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
2685 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
2687 (*_bfd_error_handler
) (fmt
, input_bfd
,
2688 x86_64_elf_howto_table
[r_type
].name
,
2689 v
, h
->root
.root
.string
, pic
);
2690 bfd_set_error (bfd_error_bad_value
);
2701 /* FIXME: The ABI says the linker should make sure the value is
2702 the same when it's zeroextended to 64 bit. */
2704 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2709 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2710 || h
->root
.type
!= bfd_link_hash_undefweak
)
2711 && ((r_type
!= R_X86_64_PC8
2712 && r_type
!= R_X86_64_PC16
2713 && r_type
!= R_X86_64_PC32
2714 && r_type
!= R_X86_64_PC64
)
2715 || !SYMBOL_CALLS_LOCAL (info
, h
)))
2716 || (ELIMINATE_COPY_RELOCS
2723 || h
->root
.type
== bfd_link_hash_undefweak
2724 || h
->root
.type
== bfd_link_hash_undefined
))
2725 || is_indirect_symbol (output_bfd
, h
))
2727 Elf_Internal_Rela outrel
;
2729 bfd_boolean skip
, relocate
;
2732 /* When generating a shared object, these relocations
2733 are copied into the output file to be resolved at run
2739 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2741 if (outrel
.r_offset
== (bfd_vma
) -1)
2743 else if (outrel
.r_offset
== (bfd_vma
) -2)
2744 skip
= TRUE
, relocate
= TRUE
;
2746 outrel
.r_offset
+= (input_section
->output_section
->vma
2747 + input_section
->output_offset
);
2750 memset (&outrel
, 0, sizeof outrel
);
2752 /* h->dynindx may be -1 if this symbol was marked to
2756 && (r_type
== R_X86_64_PC8
2757 || r_type
== R_X86_64_PC16
2758 || r_type
== R_X86_64_PC32
2759 || r_type
== R_X86_64_PC64
2761 || !SYMBOLIC_BIND (info
, h
)
2762 || !h
->def_regular
))
2764 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
2765 outrel
.r_addend
= rel
->r_addend
;
2769 /* This symbol is local, or marked to become local. */
2770 if (r_type
== R_X86_64_64
)
2773 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
2774 outrel
.r_addend
= relocation
+ rel
->r_addend
;
2780 if (bfd_is_abs_section (sec
))
2782 else if (sec
== NULL
|| sec
->owner
== NULL
)
2784 bfd_set_error (bfd_error_bad_value
);
2791 /* We are turning this relocation into one
2792 against a section symbol. It would be
2793 proper to subtract the symbol's value,
2794 osec->vma, from the emitted reloc addend,
2795 but ld.so expects buggy relocs. */
2796 osec
= sec
->output_section
;
2797 sindx
= elf_section_data (osec
)->dynindx
;
2800 asection
*oi
= htab
->elf
.text_index_section
;
2801 sindx
= elf_section_data (oi
)->dynindx
;
2803 BFD_ASSERT (sindx
!= 0);
2806 outrel
.r_info
= ELF64_R_INFO (sindx
, r_type
);
2807 outrel
.r_addend
= relocation
+ rel
->r_addend
;
2811 if ((! info
->shared
) && is_indirect_symbol (output_bfd
, h
))
2812 sreloc
= elf_section_data (input_section
)->indirect_relocs
;
2814 sreloc
= elf_section_data (input_section
)->sreloc
;
2816 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
2818 loc
= sreloc
->contents
;
2819 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2820 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2822 /* If this reloc is against an external symbol, we do
2823 not want to fiddle with the addend. Otherwise, we
2824 need to include the symbol value so that it becomes
2825 an addend for the dynamic reloc. */
2826 if (! relocate
|| is_indirect_symbol (output_bfd
, h
))
2832 case R_X86_64_TLSGD
:
2833 case R_X86_64_GOTPC32_TLSDESC
:
2834 case R_X86_64_TLSDESC_CALL
:
2835 case R_X86_64_GOTTPOFF
:
2836 tls_type
= GOT_UNKNOWN
;
2837 if (h
== NULL
&& local_got_offsets
)
2838 tls_type
= elf64_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
2840 tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
2842 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
2843 input_section
, contents
,
2844 symtab_hdr
, sym_hashes
,
2845 &r_type
, tls_type
, rel
,
2849 if (r_type
== R_X86_64_TPOFF32
)
2851 bfd_vma roff
= rel
->r_offset
;
2853 BFD_ASSERT (! unresolved_reloc
);
2855 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
2857 /* GD->LE transition.
2858 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
2859 .word 0x6666; rex64; call __tls_get_addr
2862 leaq foo@tpoff(%rax), %rax */
2863 memcpy (contents
+ roff
- 4,
2864 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
2866 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2867 contents
+ roff
+ 8);
2868 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
2872 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
2874 /* GDesc -> LE transition.
2875 It's originally something like:
2876 leaq x@tlsdesc(%rip), %rax
2882 unsigned int val
, type
, type2
;
2884 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
2885 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
2886 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
2887 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
2888 contents
+ roff
- 3);
2889 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
2890 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
2891 contents
+ roff
- 1);
2892 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2896 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
2898 /* GDesc -> LE transition.
2903 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
2904 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
2907 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
2909 /* IE->LE transition:
2910 Originally it can be one of:
2911 movq foo@gottpoff(%rip), %reg
2912 addq foo@gottpoff(%rip), %reg
2915 leaq foo(%reg), %reg
2918 unsigned int val
, type
, reg
;
2920 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
2921 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
2922 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
2928 bfd_put_8 (output_bfd
, 0x49,
2929 contents
+ roff
- 3);
2930 bfd_put_8 (output_bfd
, 0xc7,
2931 contents
+ roff
- 2);
2932 bfd_put_8 (output_bfd
, 0xc0 | reg
,
2933 contents
+ roff
- 1);
2937 /* addq -> addq - addressing with %rsp/%r12 is
2940 bfd_put_8 (output_bfd
, 0x49,
2941 contents
+ roff
- 3);
2942 bfd_put_8 (output_bfd
, 0x81,
2943 contents
+ roff
- 2);
2944 bfd_put_8 (output_bfd
, 0xc0 | reg
,
2945 contents
+ roff
- 1);
2951 bfd_put_8 (output_bfd
, 0x4d,
2952 contents
+ roff
- 3);
2953 bfd_put_8 (output_bfd
, 0x8d,
2954 contents
+ roff
- 2);
2955 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
2956 contents
+ roff
- 1);
2958 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2966 if (htab
->sgot
== NULL
)
2971 off
= h
->got
.offset
;
2972 offplt
= elf64_x86_64_hash_entry (h
)->tlsdesc_got
;
2976 if (local_got_offsets
== NULL
)
2979 off
= local_got_offsets
[r_symndx
];
2980 offplt
= local_tlsdesc_gotents
[r_symndx
];
2987 Elf_Internal_Rela outrel
;
2992 if (htab
->srelgot
== NULL
)
2995 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
2997 if (GOT_TLS_GDESC_P (tls_type
))
2999 outrel
.r_info
= ELF64_R_INFO (indx
, R_X86_64_TLSDESC
);
3000 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3001 + 2 * GOT_ENTRY_SIZE
<= htab
->sgotplt
->size
);
3002 outrel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3003 + htab
->sgotplt
->output_offset
3005 + htab
->sgotplt_jump_table_size
);
3006 sreloc
= htab
->srelplt
;
3007 loc
= sreloc
->contents
;
3008 loc
+= sreloc
->reloc_count
++
3009 * sizeof (Elf64_External_Rela
);
3010 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3011 <= sreloc
->contents
+ sreloc
->size
);
3013 outrel
.r_addend
= relocation
- dtpoff_base (info
);
3015 outrel
.r_addend
= 0;
3016 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3019 sreloc
= htab
->srelgot
;
3021 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3022 + htab
->sgot
->output_offset
+ off
);
3024 if (GOT_TLS_GD_P (tls_type
))
3025 dr_type
= R_X86_64_DTPMOD64
;
3026 else if (GOT_TLS_GDESC_P (tls_type
))
3029 dr_type
= R_X86_64_TPOFF64
;
3031 bfd_put_64 (output_bfd
, 0, htab
->sgot
->contents
+ off
);
3032 outrel
.r_addend
= 0;
3033 if ((dr_type
== R_X86_64_TPOFF64
3034 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3035 outrel
.r_addend
= relocation
- dtpoff_base (info
);
3036 outrel
.r_info
= ELF64_R_INFO (indx
, dr_type
);
3038 loc
= sreloc
->contents
;
3039 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3040 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3041 <= sreloc
->contents
+ sreloc
->size
);
3042 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3044 if (GOT_TLS_GD_P (tls_type
))
3048 BFD_ASSERT (! unresolved_reloc
);
3049 bfd_put_64 (output_bfd
,
3050 relocation
- dtpoff_base (info
),
3051 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3055 bfd_put_64 (output_bfd
, 0,
3056 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3057 outrel
.r_info
= ELF64_R_INFO (indx
,
3059 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3060 sreloc
->reloc_count
++;
3061 loc
+= sizeof (Elf64_External_Rela
);
3062 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3063 <= sreloc
->contents
+ sreloc
->size
);
3064 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3072 local_got_offsets
[r_symndx
] |= 1;
3075 if (off
>= (bfd_vma
) -2
3076 && ! GOT_TLS_GDESC_P (tls_type
))
3078 if (r_type
== ELF64_R_TYPE (rel
->r_info
))
3080 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3081 || r_type
== R_X86_64_TLSDESC_CALL
)
3082 relocation
= htab
->sgotplt
->output_section
->vma
3083 + htab
->sgotplt
->output_offset
3084 + offplt
+ htab
->sgotplt_jump_table_size
;
3086 relocation
= htab
->sgot
->output_section
->vma
3087 + htab
->sgot
->output_offset
+ off
;
3088 unresolved_reloc
= FALSE
;
3092 bfd_vma roff
= rel
->r_offset
;
3094 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3096 /* GD->IE transition.
3097 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3098 .word 0x6666; rex64; call __tls_get_addr@plt
3101 addq foo@gottpoff(%rip), %rax */
3102 memcpy (contents
+ roff
- 4,
3103 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3106 relocation
= (htab
->sgot
->output_section
->vma
3107 + htab
->sgot
->output_offset
+ off
3109 - input_section
->output_section
->vma
3110 - input_section
->output_offset
3112 bfd_put_32 (output_bfd
, relocation
,
3113 contents
+ roff
+ 8);
3114 /* Skip R_X86_64_PLT32. */
3118 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3120 /* GDesc -> IE transition.
3121 It's originally something like:
3122 leaq x@tlsdesc(%rip), %rax
3125 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3128 unsigned int val
, type
, type2
;
3130 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3131 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3132 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3134 /* Now modify the instruction as appropriate. To
3135 turn a leaq into a movq in the form we use it, it
3136 suffices to change the second byte from 0x8d to
3138 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3140 bfd_put_32 (output_bfd
,
3141 htab
->sgot
->output_section
->vma
3142 + htab
->sgot
->output_offset
+ off
3144 - input_section
->output_section
->vma
3145 - input_section
->output_offset
3150 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3152 /* GDesc -> IE transition.
3159 unsigned int val
, type
;
3161 type
= bfd_get_8 (input_bfd
, contents
+ roff
);
3162 val
= bfd_get_8 (input_bfd
, contents
+ roff
+ 1);
3163 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3164 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3172 case R_X86_64_TLSLD
:
3173 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3174 input_section
, contents
,
3175 symtab_hdr
, sym_hashes
,
3176 &r_type
, GOT_UNKNOWN
,
3180 if (r_type
!= R_X86_64_TLSLD
)
3182 /* LD->LE transition:
3183 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3185 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3187 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3188 memcpy (contents
+ rel
->r_offset
- 3,
3189 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3190 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3195 if (htab
->sgot
== NULL
)
3198 off
= htab
->tls_ld_got
.offset
;
3203 Elf_Internal_Rela outrel
;
3206 if (htab
->srelgot
== NULL
)
3209 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3210 + htab
->sgot
->output_offset
+ off
);
3212 bfd_put_64 (output_bfd
, 0,
3213 htab
->sgot
->contents
+ off
);
3214 bfd_put_64 (output_bfd
, 0,
3215 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3216 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_DTPMOD64
);
3217 outrel
.r_addend
= 0;
3218 loc
= htab
->srelgot
->contents
;
3219 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3220 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3221 htab
->tls_ld_got
.offset
|= 1;
3223 relocation
= htab
->sgot
->output_section
->vma
3224 + htab
->sgot
->output_offset
+ off
;
3225 unresolved_reloc
= FALSE
;
3228 case R_X86_64_DTPOFF32
:
3229 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
3230 relocation
-= dtpoff_base (info
);
3232 relocation
= tpoff (info
, relocation
);
3235 case R_X86_64_TPOFF32
:
3236 BFD_ASSERT (! info
->shared
);
3237 relocation
= tpoff (info
, relocation
);
3244 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3245 because such sections are not SEC_ALLOC and thus ld.so will
3246 not process them. */
3247 if (unresolved_reloc
3248 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3250 (*_bfd_error_handler
)
3251 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3254 (long) rel
->r_offset
,
3256 h
->root
.root
.string
);
3258 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3259 contents
, rel
->r_offset
,
3260 relocation
, rel
->r_addend
);
3262 if (r
!= bfd_reloc_ok
)
3267 name
= h
->root
.root
.string
;
3270 name
= bfd_elf_string_from_elf_section (input_bfd
,
3271 symtab_hdr
->sh_link
,
3276 name
= bfd_section_name (input_bfd
, sec
);
3279 if (r
== bfd_reloc_overflow
)
3281 if (! ((*info
->callbacks
->reloc_overflow
)
3282 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3283 (bfd_vma
) 0, input_bfd
, input_section
,
3289 (*_bfd_error_handler
)
3290 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3291 input_bfd
, input_section
,
3292 (long) rel
->r_offset
, name
, (int) r
);
3301 /* Finish up dynamic symbol handling. We set the contents of various
3302 dynamic sections here. */
3305 elf64_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3306 struct bfd_link_info
*info
,
3307 struct elf_link_hash_entry
*h
,
3308 Elf_Internal_Sym
*sym
)
3310 struct elf64_x86_64_link_hash_table
*htab
;
3312 htab
= elf64_x86_64_hash_table (info
);
3314 if (h
->plt
.offset
!= (bfd_vma
) -1)
3318 Elf_Internal_Rela rela
;
3321 /* This symbol has an entry in the procedure linkage table. Set
3323 if (h
->dynindx
== -1
3324 || htab
->splt
== NULL
3325 || htab
->sgotplt
== NULL
3326 || htab
->srelplt
== NULL
)
3329 /* Get the index in the procedure linkage table which
3330 corresponds to this symbol. This is the index of this symbol
3331 in all the symbols for which we are making plt entries. The
3332 first entry in the procedure linkage table is reserved. */
3333 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3335 /* Get the offset into the .got table of the entry that
3336 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3337 bytes. The first three are reserved for the dynamic linker. */
3338 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3340 /* Fill in the entry in the procedure linkage table. */
3341 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf64_x86_64_plt_entry
,
3344 /* Insert the relocation positions of the plt section. The magic
3345 numbers at the end of the statements are the positions of the
3346 relocations in the plt section. */
3347 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3348 instruction uses 6 bytes, subtract this value. */
3349 bfd_put_32 (output_bfd
,
3350 (htab
->sgotplt
->output_section
->vma
3351 + htab
->sgotplt
->output_offset
3353 - htab
->splt
->output_section
->vma
3354 - htab
->splt
->output_offset
3357 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3358 /* Put relocation index. */
3359 bfd_put_32 (output_bfd
, plt_index
,
3360 htab
->splt
->contents
+ h
->plt
.offset
+ 7);
3361 /* Put offset for jmp .PLT0. */
3362 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3363 htab
->splt
->contents
+ h
->plt
.offset
+ 12);
3365 /* Fill in the entry in the global offset table, initially this
3366 points to the pushq instruction in the PLT which is at offset 6. */
3367 bfd_put_64 (output_bfd
, (htab
->splt
->output_section
->vma
3368 + htab
->splt
->output_offset
3369 + h
->plt
.offset
+ 6),
3370 htab
->sgotplt
->contents
+ got_offset
);
3372 /* Fill in the entry in the .rela.plt section. */
3373 rela
.r_offset
= (htab
->sgotplt
->output_section
->vma
3374 + htab
->sgotplt
->output_offset
3376 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_JUMP_SLOT
);
3378 loc
= htab
->srelplt
->contents
+ plt_index
* sizeof (Elf64_External_Rela
);
3379 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3381 if (!h
->def_regular
)
3383 /* Mark the symbol as undefined, rather than as defined in
3384 the .plt section. Leave the value if there were any
3385 relocations where pointer equality matters (this is a clue
3386 for the dynamic linker, to make function pointer
3387 comparisons work between an application and shared
3388 library), otherwise set it to zero. If a function is only
3389 called from a binary, there is no need to slow down
3390 shared libraries because of that. */
3391 sym
->st_shndx
= SHN_UNDEF
;
3392 if (!h
->pointer_equality_needed
)
3397 if (h
->got
.offset
!= (bfd_vma
) -1
3398 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h
)->tls_type
)
3399 && elf64_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
3401 Elf_Internal_Rela rela
;
3404 /* This symbol has an entry in the global offset table. Set it
3406 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
3409 rela
.r_offset
= (htab
->sgot
->output_section
->vma
3410 + htab
->sgot
->output_offset
3411 + (h
->got
.offset
&~ (bfd_vma
) 1));
3413 /* If this is a static link, or it is a -Bsymbolic link and the
3414 symbol is defined locally or was forced to be local because
3415 of a version file, we just want to emit a RELATIVE reloc.
3416 The entry in the global offset table will already have been
3417 initialized in the relocate_section function. */
3419 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3421 if (!h
->def_regular
)
3423 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3424 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3425 rela
.r_addend
= (h
->root
.u
.def
.value
3426 + h
->root
.u
.def
.section
->output_section
->vma
3427 + h
->root
.u
.def
.section
->output_offset
);
3431 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3432 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
3433 htab
->sgot
->contents
+ h
->got
.offset
);
3434 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_GLOB_DAT
);
3438 loc
= htab
->srelgot
->contents
;
3439 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3440 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3445 Elf_Internal_Rela rela
;
3448 /* This symbol needs a copy reloc. Set it up. */
3450 if (h
->dynindx
== -1
3451 || (h
->root
.type
!= bfd_link_hash_defined
3452 && h
->root
.type
!= bfd_link_hash_defweak
)
3453 || htab
->srelbss
== NULL
)
3456 rela
.r_offset
= (h
->root
.u
.def
.value
3457 + h
->root
.u
.def
.section
->output_section
->vma
3458 + h
->root
.u
.def
.section
->output_offset
);
3459 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_COPY
);
3461 loc
= htab
->srelbss
->contents
;
3462 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3463 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3466 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3467 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3468 || h
== htab
->elf
.hgot
)
3469 sym
->st_shndx
= SHN_ABS
;
3474 /* Used to decide how to sort relocs in an optimal manner for the
3475 dynamic linker, before writing them out. */
3477 static enum elf_reloc_type_class
3478 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
3480 switch ((int) ELF64_R_TYPE (rela
->r_info
))
3482 case R_X86_64_RELATIVE
:
3483 return reloc_class_relative
;
3484 case R_X86_64_JUMP_SLOT
:
3485 return reloc_class_plt
;
3487 return reloc_class_copy
;
3489 return reloc_class_normal
;
3493 /* Finish up the dynamic sections. */
3496 elf64_x86_64_finish_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
3498 struct elf64_x86_64_link_hash_table
*htab
;
3502 htab
= elf64_x86_64_hash_table (info
);
3503 dynobj
= htab
->elf
.dynobj
;
3504 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3506 if (htab
->elf
.dynamic_sections_created
)
3508 Elf64_External_Dyn
*dyncon
, *dynconend
;
3510 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
3513 dyncon
= (Elf64_External_Dyn
*) sdyn
->contents
;
3514 dynconend
= (Elf64_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3515 for (; dyncon
< dynconend
; dyncon
++)
3517 Elf_Internal_Dyn dyn
;
3520 bfd_elf64_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3529 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3533 dyn
.d_un
.d_ptr
= htab
->srelplt
->output_section
->vma
;
3537 s
= htab
->srelplt
->output_section
;
3538 dyn
.d_un
.d_val
= s
->size
;
3542 /* The procedure linkage table relocs (DT_JMPREL) should
3543 not be included in the overall relocs (DT_RELA).
3544 Therefore, we override the DT_RELASZ entry here to
3545 make it not include the JMPREL relocs. Since the
3546 linker script arranges for .rela.plt to follow all
3547 other relocation sections, we don't have to worry
3548 about changing the DT_RELA entry. */
3549 if (htab
->srelplt
!= NULL
)
3551 s
= htab
->srelplt
->output_section
;
3552 dyn
.d_un
.d_val
-= s
->size
;
3556 case DT_TLSDESC_PLT
:
3558 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
3559 + htab
->tlsdesc_plt
;
3562 case DT_TLSDESC_GOT
:
3564 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
3565 + htab
->tlsdesc_got
;
3569 bfd_elf64_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3572 /* Fill in the special first entry in the procedure linkage table. */
3573 if (htab
->splt
&& htab
->splt
->size
> 0)
3575 /* Fill in the first entry in the procedure linkage table. */
3576 memcpy (htab
->splt
->contents
, elf64_x86_64_plt0_entry
,
3578 /* Add offset for pushq GOT+8(%rip), since the instruction
3579 uses 6 bytes subtract this value. */
3580 bfd_put_32 (output_bfd
,
3581 (htab
->sgotplt
->output_section
->vma
3582 + htab
->sgotplt
->output_offset
3584 - htab
->splt
->output_section
->vma
3585 - htab
->splt
->output_offset
3587 htab
->splt
->contents
+ 2);
3588 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
3589 the end of the instruction. */
3590 bfd_put_32 (output_bfd
,
3591 (htab
->sgotplt
->output_section
->vma
3592 + htab
->sgotplt
->output_offset
3594 - htab
->splt
->output_section
->vma
3595 - htab
->splt
->output_offset
3597 htab
->splt
->contents
+ 8);
3599 elf_section_data (htab
->splt
->output_section
)->this_hdr
.sh_entsize
=
3602 if (htab
->tlsdesc_plt
)
3604 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
3605 htab
->sgot
->contents
+ htab
->tlsdesc_got
);
3607 memcpy (htab
->splt
->contents
+ htab
->tlsdesc_plt
,
3608 elf64_x86_64_plt0_entry
,
3611 /* Add offset for pushq GOT+8(%rip), since the
3612 instruction uses 6 bytes subtract this value. */
3613 bfd_put_32 (output_bfd
,
3614 (htab
->sgotplt
->output_section
->vma
3615 + htab
->sgotplt
->output_offset
3617 - htab
->splt
->output_section
->vma
3618 - htab
->splt
->output_offset
3621 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 2);
3622 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
3623 htab->tlsdesc_got. The 12 is the offset to the end of
3625 bfd_put_32 (output_bfd
,
3626 (htab
->sgot
->output_section
->vma
3627 + htab
->sgot
->output_offset
3629 - htab
->splt
->output_section
->vma
3630 - htab
->splt
->output_offset
3633 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 8);
3640 /* Fill in the first three entries in the global offset table. */
3641 if (htab
->sgotplt
->size
> 0)
3643 /* Set the first entry in the global offset table to the address of
3644 the dynamic section. */
3646 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
);
3648 bfd_put_64 (output_bfd
,
3649 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
3650 htab
->sgotplt
->contents
);
3651 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
3652 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
);
3653 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
3656 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
=
3660 if (htab
->sgot
&& htab
->sgot
->size
> 0)
3661 elf_section_data (htab
->sgot
->output_section
)->this_hdr
.sh_entsize
3667 /* Return address for Ith PLT stub in section PLT, for relocation REL
3668 or (bfd_vma) -1 if it should not be included. */
3671 elf64_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
3672 const arelent
*rel ATTRIBUTE_UNUSED
)
3674 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
3677 /* Handle an x86-64 specific section when reading an object file. This
3678 is called when elfcode.h finds a section with an unknown type. */
3681 elf64_x86_64_section_from_shdr (bfd
*abfd
,
3682 Elf_Internal_Shdr
*hdr
,
3686 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
3689 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
3695 /* Hook called by the linker routine which adds symbols from an object
3696 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
3700 elf64_x86_64_add_symbol_hook (bfd
*abfd
,
3701 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3702 Elf_Internal_Sym
*sym
,
3703 const char **namep ATTRIBUTE_UNUSED
,
3704 flagword
*flagsp ATTRIBUTE_UNUSED
,
3705 asection
**secp
, bfd_vma
*valp
)
3709 switch (sym
->st_shndx
)
3711 case SHN_X86_64_LCOMMON
:
3712 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
3715 lcomm
= bfd_make_section_with_flags (abfd
,
3719 | SEC_LINKER_CREATED
));
3722 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
3725 *valp
= sym
->st_size
;
3732 /* Given a BFD section, try to locate the corresponding ELF section
3736 elf64_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
3737 asection
*sec
, int *index
)
3739 if (sec
== &_bfd_elf_large_com_section
)
3741 *index
= SHN_X86_64_LCOMMON
;
3747 /* Process a symbol. */
3750 elf64_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
3753 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
3755 switch (elfsym
->internal_elf_sym
.st_shndx
)
3757 case SHN_X86_64_LCOMMON
:
3758 asym
->section
= &_bfd_elf_large_com_section
;
3759 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
3760 /* Common symbol doesn't set BSF_GLOBAL. */
3761 asym
->flags
&= ~BSF_GLOBAL
;
3767 elf64_x86_64_common_definition (Elf_Internal_Sym
*sym
)
3769 return (sym
->st_shndx
== SHN_COMMON
3770 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
3774 elf64_x86_64_common_section_index (asection
*sec
)
3776 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
3779 return SHN_X86_64_LCOMMON
;
3783 elf64_x86_64_common_section (asection
*sec
)
3785 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
3786 return bfd_com_section_ptr
;
3788 return &_bfd_elf_large_com_section
;
3792 elf64_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3793 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
3794 struct elf_link_hash_entry
*h
,
3795 Elf_Internal_Sym
*sym
,
3797 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
3798 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
3799 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
3800 bfd_boolean
*override ATTRIBUTE_UNUSED
,
3801 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
3802 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
3803 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
3804 bfd_boolean
*newdyn
,
3805 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
3806 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
3807 bfd
*abfd ATTRIBUTE_UNUSED
,
3809 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
3810 bfd_boolean
*olddyn
,
3811 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
3812 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
3816 /* A normal common symbol and a large common symbol result in a
3817 normal common symbol. We turn the large common symbol into a
3820 && h
->root
.type
== bfd_link_hash_common
3822 && bfd_is_com_section (*sec
)
3825 if (sym
->st_shndx
== SHN_COMMON
3826 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
3828 h
->root
.u
.c
.p
->section
3829 = bfd_make_section_old_way (oldbfd
, "COMMON");
3830 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
3832 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
3833 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
3834 *psec
= *sec
= bfd_com_section_ptr
;
3841 elf64_x86_64_additional_program_headers (bfd
*abfd
,
3842 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
3847 /* Check to see if we need a large readonly segment. */
3848 s
= bfd_get_section_by_name (abfd
, ".lrodata");
3849 if (s
&& (s
->flags
& SEC_LOAD
))
3852 /* Check to see if we need a large data segment. Since .lbss sections
3853 is placed right after the .bss section, there should be no need for
3854 a large data segment just because of .lbss. */
3855 s
= bfd_get_section_by_name (abfd
, ".ldata");
3856 if (s
&& (s
->flags
& SEC_LOAD
))
3862 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
3865 elf64_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
3867 if (h
->plt
.offset
!= (bfd_vma
) -1
3869 && !h
->pointer_equality_needed
)
3872 return _bfd_elf_hash_symbol (h
);
3875 static const struct bfd_elf_special_section
3876 elf64_x86_64_special_sections
[]=
3878 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3879 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
3880 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
3881 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3882 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3883 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
3884 { NULL
, 0, 0, 0, 0 }
3887 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
3888 #define TARGET_LITTLE_NAME "elf64-x86-64"
3889 #define ELF_ARCH bfd_arch_i386
3890 #define ELF_MACHINE_CODE EM_X86_64
3891 #define ELF_MAXPAGESIZE 0x200000
3892 #define ELF_MINPAGESIZE 0x1000
3893 #define ELF_COMMONPAGESIZE 0x1000
3895 #define elf_backend_can_gc_sections 1
3896 #define elf_backend_can_refcount 1
3897 #define elf_backend_want_got_plt 1
3898 #define elf_backend_plt_readonly 1
3899 #define elf_backend_want_plt_sym 0
3900 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
3901 #define elf_backend_rela_normal 1
3903 #define elf_info_to_howto elf64_x86_64_info_to_howto
3905 #define bfd_elf64_bfd_link_hash_table_create \
3906 elf64_x86_64_link_hash_table_create
3907 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
3908 #define bfd_elf64_bfd_reloc_name_lookup \
3909 elf64_x86_64_reloc_name_lookup
3911 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
3912 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
3913 #define elf_backend_check_relocs elf64_x86_64_check_relocs
3914 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
3915 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
3916 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
3917 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
3918 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
3919 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
3920 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
3921 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
3922 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
3923 #define elf_backend_relocate_section elf64_x86_64_relocate_section
3924 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
3925 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
3926 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3927 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
3928 #define elf_backend_object_p elf64_x86_64_elf_object_p
3929 #define bfd_elf64_mkobject elf64_x86_64_mkobject
3931 #define elf_backend_section_from_shdr \
3932 elf64_x86_64_section_from_shdr
3934 #define elf_backend_section_from_bfd_section \
3935 elf64_x86_64_elf_section_from_bfd_section
3936 #define elf_backend_add_symbol_hook \
3937 elf64_x86_64_add_symbol_hook
3938 #define elf_backend_symbol_processing \
3939 elf64_x86_64_symbol_processing
3940 #define elf_backend_common_section_index \
3941 elf64_x86_64_common_section_index
3942 #define elf_backend_common_section \
3943 elf64_x86_64_common_section
3944 #define elf_backend_common_definition \
3945 elf64_x86_64_common_definition
3946 #define elf_backend_merge_symbol \
3947 elf64_x86_64_merge_symbol
3948 #define elf_backend_special_sections \
3949 elf64_x86_64_special_sections
3950 #define elf_backend_additional_program_headers \
3951 elf64_x86_64_additional_program_headers
3952 #define elf_backend_hash_symbol \
3953 elf64_x86_64_hash_symbol
3955 #include "elf64-target.h"
3957 /* FreeBSD support. */
3959 #undef TARGET_LITTLE_SYM
3960 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
3961 #undef TARGET_LITTLE_NAME
3962 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
3965 #define ELF_OSABI ELFOSABI_FREEBSD
3967 #undef elf_backend_post_process_headers
3968 #define elf_backend_post_process_headers _bfd_elf_set_osabi
3971 #define elf64_bed elf64_x86_64_fbsd_bed
3973 #include "elf64-target.h"