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 /* Look through the relocs for a section during the first phase, and
978 calculate needed space in the global offset table, procedure
979 linkage table, and dynamic reloc sections. */
982 elf64_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
984 const Elf_Internal_Rela
*relocs
)
986 struct elf64_x86_64_link_hash_table
*htab
;
987 Elf_Internal_Shdr
*symtab_hdr
;
988 struct elf_link_hash_entry
**sym_hashes
;
989 const Elf_Internal_Rela
*rel
;
990 const Elf_Internal_Rela
*rel_end
;
993 if (info
->relocatable
)
996 BFD_ASSERT (is_x86_64_elf (abfd
));
998 htab
= elf64_x86_64_hash_table (info
);
999 symtab_hdr
= &elf_symtab_hdr (abfd
);
1000 sym_hashes
= elf_sym_hashes (abfd
);
1004 rel_end
= relocs
+ sec
->reloc_count
;
1005 for (rel
= relocs
; rel
< rel_end
; rel
++)
1007 unsigned int r_type
;
1008 unsigned long r_symndx
;
1009 struct elf_link_hash_entry
*h
;
1011 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1012 r_type
= ELF64_R_TYPE (rel
->r_info
);
1014 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1016 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1021 if (r_symndx
< symtab_hdr
->sh_info
)
1025 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1026 while (h
->root
.type
== bfd_link_hash_indirect
1027 || h
->root
.type
== bfd_link_hash_warning
)
1028 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1031 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1032 symtab_hdr
, sym_hashes
,
1033 &r_type
, GOT_UNKNOWN
,
1039 case R_X86_64_TLSLD
:
1040 htab
->tls_ld_got
.refcount
+= 1;
1043 case R_X86_64_TPOFF32
:
1046 (*_bfd_error_handler
)
1047 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1049 x86_64_elf_howto_table
[r_type
].name
,
1050 (h
) ? h
->root
.root
.string
: "a local symbol");
1051 bfd_set_error (bfd_error_bad_value
);
1056 case R_X86_64_GOTTPOFF
:
1058 info
->flags
|= DF_STATIC_TLS
;
1061 case R_X86_64_GOT32
:
1062 case R_X86_64_GOTPCREL
:
1063 case R_X86_64_TLSGD
:
1064 case R_X86_64_GOT64
:
1065 case R_X86_64_GOTPCREL64
:
1066 case R_X86_64_GOTPLT64
:
1067 case R_X86_64_GOTPC32_TLSDESC
:
1068 case R_X86_64_TLSDESC_CALL
:
1069 /* This symbol requires a global offset table entry. */
1071 int tls_type
, old_tls_type
;
1075 default: tls_type
= GOT_NORMAL
; break;
1076 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1077 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1078 case R_X86_64_GOTPC32_TLSDESC
:
1079 case R_X86_64_TLSDESC_CALL
:
1080 tls_type
= GOT_TLS_GDESC
; break;
1085 if (r_type
== R_X86_64_GOTPLT64
)
1087 /* This relocation indicates that we also need
1088 a PLT entry, as this is a function. We don't need
1089 a PLT entry for local symbols. */
1091 h
->plt
.refcount
+= 1;
1093 h
->got
.refcount
+= 1;
1094 old_tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1098 bfd_signed_vma
*local_got_refcounts
;
1100 /* This is a global offset table entry for a local symbol. */
1101 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1102 if (local_got_refcounts
== NULL
)
1106 size
= symtab_hdr
->sh_info
;
1107 size
*= sizeof (bfd_signed_vma
)
1108 + sizeof (bfd_vma
) + sizeof (char);
1109 local_got_refcounts
= ((bfd_signed_vma
*)
1110 bfd_zalloc (abfd
, size
));
1111 if (local_got_refcounts
== NULL
)
1113 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1114 elf64_x86_64_local_tlsdesc_gotent (abfd
)
1115 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1116 elf64_x86_64_local_got_tls_type (abfd
)
1117 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1119 local_got_refcounts
[r_symndx
] += 1;
1121 = elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1124 /* If a TLS symbol is accessed using IE at least once,
1125 there is no point to use dynamic model for it. */
1126 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1127 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1128 || tls_type
!= GOT_TLS_IE
))
1130 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1131 tls_type
= old_tls_type
;
1132 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1133 && GOT_TLS_GD_ANY_P (tls_type
))
1134 tls_type
|= old_tls_type
;
1137 (*_bfd_error_handler
)
1138 (_("%B: '%s' accessed both as normal and thread local symbol"),
1139 abfd
, h
? h
->root
.root
.string
: "<local>");
1144 if (old_tls_type
!= tls_type
)
1147 elf64_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1149 elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1154 case R_X86_64_GOTOFF64
:
1155 case R_X86_64_GOTPC32
:
1156 case R_X86_64_GOTPC64
:
1158 if (htab
->sgot
== NULL
)
1160 if (htab
->elf
.dynobj
== NULL
)
1161 htab
->elf
.dynobj
= abfd
;
1162 if (!create_got_section (htab
->elf
.dynobj
, info
))
1167 case R_X86_64_PLT32
:
1168 /* This symbol requires a procedure linkage table entry. We
1169 actually build the entry in adjust_dynamic_symbol,
1170 because this might be a case of linking PIC code which is
1171 never referenced by a dynamic object, in which case we
1172 don't need to generate a procedure linkage table entry
1175 /* If this is a local symbol, we resolve it directly without
1176 creating a procedure linkage table entry. */
1181 h
->plt
.refcount
+= 1;
1184 case R_X86_64_PLTOFF64
:
1185 /* This tries to form the 'address' of a function relative
1186 to GOT. For global symbols we need a PLT entry. */
1190 h
->plt
.refcount
+= 1;
1198 /* Let's help debug shared library creation. These relocs
1199 cannot be used in shared libs. Don't error out for
1200 sections we don't care about, such as debug sections or
1201 non-constant sections. */
1203 && (sec
->flags
& SEC_ALLOC
) != 0
1204 && (sec
->flags
& SEC_READONLY
) != 0)
1206 (*_bfd_error_handler
)
1207 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1209 x86_64_elf_howto_table
[r_type
].name
,
1210 (h
) ? h
->root
.root
.string
: "a local symbol");
1211 bfd_set_error (bfd_error_bad_value
);
1221 if (h
!= NULL
&& !info
->shared
)
1223 /* If this reloc is in a read-only section, we might
1224 need a copy reloc. We can't check reliably at this
1225 stage whether the section is read-only, as input
1226 sections have not yet been mapped to output sections.
1227 Tentatively set the flag for now, and correct in
1228 adjust_dynamic_symbol. */
1231 /* We may need a .plt entry if the function this reloc
1232 refers to is in a shared lib. */
1233 h
->plt
.refcount
+= 1;
1234 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1235 h
->pointer_equality_needed
= 1;
1238 /* If we are creating a shared library, and this is a reloc
1239 against a global symbol, or a non PC relative reloc
1240 against a local symbol, then we need to copy the reloc
1241 into the shared library. However, if we are linking with
1242 -Bsymbolic, we do not need to copy a reloc against a
1243 global symbol which is defined in an object we are
1244 including in the link (i.e., DEF_REGULAR is set). At
1245 this point we have not seen all the input files, so it is
1246 possible that DEF_REGULAR is not set now but will be set
1247 later (it is never cleared). In case of a weak definition,
1248 DEF_REGULAR may be cleared later by a strong definition in
1249 a shared library. We account for that possibility below by
1250 storing information in the relocs_copied field of the hash
1251 table entry. A similar situation occurs when creating
1252 shared libraries and symbol visibility changes render the
1255 If on the other hand, we are creating an executable, we
1256 may need to keep relocations for symbols satisfied by a
1257 dynamic library if we manage to avoid copy relocs for the
1260 && (sec
->flags
& SEC_ALLOC
) != 0
1261 && (((r_type
!= R_X86_64_PC8
)
1262 && (r_type
!= R_X86_64_PC16
)
1263 && (r_type
!= R_X86_64_PC32
)
1264 && (r_type
!= R_X86_64_PC64
))
1266 && (! SYMBOLIC_BIND (info
, h
)
1267 || h
->root
.type
== bfd_link_hash_defweak
1268 || !h
->def_regular
))))
1269 || (ELIMINATE_COPY_RELOCS
1271 && (sec
->flags
& SEC_ALLOC
) != 0
1273 && (h
->root
.type
== bfd_link_hash_defweak
1274 || !h
->def_regular
)))
1276 struct elf64_x86_64_dyn_relocs
*p
;
1277 struct elf64_x86_64_dyn_relocs
**head
;
1279 /* We must copy these reloc types into the output file.
1280 Create a reloc section in dynobj and make room for
1284 if (htab
->elf
.dynobj
== NULL
)
1285 htab
->elf
.dynobj
= abfd
;
1287 sreloc
= _bfd_elf_make_dynamic_reloc_section
1288 (sec
, htab
->elf
.dynobj
, 3, abfd
, /*rela?*/ TRUE
);
1294 /* If this is a global symbol, we count the number of
1295 relocations we need for this symbol. */
1298 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1303 /* Track dynamic relocs needed for local syms too.
1304 We really need local syms available to do this
1308 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1313 /* Beware of type punned pointers vs strict aliasing
1315 vpp
= &(elf_section_data (s
)->local_dynrel
);
1316 head
= (struct elf64_x86_64_dyn_relocs
**)vpp
;
1320 if (p
== NULL
|| p
->sec
!= sec
)
1322 bfd_size_type amt
= sizeof *p
;
1323 p
= ((struct elf64_x86_64_dyn_relocs
*)
1324 bfd_alloc (htab
->elf
.dynobj
, amt
));
1335 if (r_type
== R_X86_64_PC8
1336 || r_type
== R_X86_64_PC16
1337 || r_type
== R_X86_64_PC32
1338 || r_type
== R_X86_64_PC64
)
1343 /* This relocation describes the C++ object vtable hierarchy.
1344 Reconstruct it for later use during GC. */
1345 case R_X86_64_GNU_VTINHERIT
:
1346 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1350 /* This relocation describes which C++ vtable entries are actually
1351 used. Record for later use during GC. */
1352 case R_X86_64_GNU_VTENTRY
:
1353 BFD_ASSERT (h
!= NULL
);
1355 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1367 /* Return the section that should be marked against GC for a given
1371 elf64_x86_64_gc_mark_hook (asection
*sec
,
1372 struct bfd_link_info
*info
,
1373 Elf_Internal_Rela
*rel
,
1374 struct elf_link_hash_entry
*h
,
1375 Elf_Internal_Sym
*sym
)
1378 switch (ELF64_R_TYPE (rel
->r_info
))
1380 case R_X86_64_GNU_VTINHERIT
:
1381 case R_X86_64_GNU_VTENTRY
:
1385 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1388 /* Update the got entry reference counts for the section being removed. */
1391 elf64_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1393 const Elf_Internal_Rela
*relocs
)
1395 Elf_Internal_Shdr
*symtab_hdr
;
1396 struct elf_link_hash_entry
**sym_hashes
;
1397 bfd_signed_vma
*local_got_refcounts
;
1398 const Elf_Internal_Rela
*rel
, *relend
;
1400 if (info
->relocatable
)
1403 elf_section_data (sec
)->local_dynrel
= NULL
;
1405 symtab_hdr
= &elf_symtab_hdr (abfd
);
1406 sym_hashes
= elf_sym_hashes (abfd
);
1407 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1409 relend
= relocs
+ sec
->reloc_count
;
1410 for (rel
= relocs
; rel
< relend
; rel
++)
1412 unsigned long r_symndx
;
1413 unsigned int r_type
;
1414 struct elf_link_hash_entry
*h
= NULL
;
1416 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1417 if (r_symndx
>= symtab_hdr
->sh_info
)
1419 struct elf64_x86_64_link_hash_entry
*eh
;
1420 struct elf64_x86_64_dyn_relocs
**pp
;
1421 struct elf64_x86_64_dyn_relocs
*p
;
1423 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1424 while (h
->root
.type
== bfd_link_hash_indirect
1425 || h
->root
.type
== bfd_link_hash_warning
)
1426 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1427 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1429 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1432 /* Everything must go for SEC. */
1438 r_type
= ELF64_R_TYPE (rel
->r_info
);
1439 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1440 symtab_hdr
, sym_hashes
,
1441 &r_type
, GOT_UNKNOWN
,
1447 case R_X86_64_TLSLD
:
1448 if (elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
> 0)
1449 elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
-= 1;
1452 case R_X86_64_TLSGD
:
1453 case R_X86_64_GOTPC32_TLSDESC
:
1454 case R_X86_64_TLSDESC_CALL
:
1455 case R_X86_64_GOTTPOFF
:
1456 case R_X86_64_GOT32
:
1457 case R_X86_64_GOTPCREL
:
1458 case R_X86_64_GOT64
:
1459 case R_X86_64_GOTPCREL64
:
1460 case R_X86_64_GOTPLT64
:
1463 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1464 h
->plt
.refcount
-= 1;
1465 if (h
->got
.refcount
> 0)
1466 h
->got
.refcount
-= 1;
1468 else if (local_got_refcounts
!= NULL
)
1470 if (local_got_refcounts
[r_symndx
] > 0)
1471 local_got_refcounts
[r_symndx
] -= 1;
1488 case R_X86_64_PLT32
:
1489 case R_X86_64_PLTOFF64
:
1492 if (h
->plt
.refcount
> 0)
1493 h
->plt
.refcount
-= 1;
1505 /* Adjust a symbol defined by a dynamic object and referenced by a
1506 regular object. The current definition is in some section of the
1507 dynamic object, but we're not including those sections. We have to
1508 change the definition to something the rest of the link can
1512 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1513 struct elf_link_hash_entry
*h
)
1515 struct elf64_x86_64_link_hash_table
*htab
;
1518 /* If this is a function, put it in the procedure linkage table. We
1519 will fill in the contents of the procedure linkage table later,
1520 when we know the address of the .got section. */
1521 if (h
->type
== STT_FUNC
1524 if (h
->plt
.refcount
<= 0
1525 || SYMBOL_CALLS_LOCAL (info
, h
)
1526 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1527 && h
->root
.type
== bfd_link_hash_undefweak
))
1529 /* This case can occur if we saw a PLT32 reloc in an input
1530 file, but the symbol was never referred to by a dynamic
1531 object, or if all references were garbage collected. In
1532 such a case, we don't actually need to build a procedure
1533 linkage table, and we can just do a PC32 reloc instead. */
1534 h
->plt
.offset
= (bfd_vma
) -1;
1541 /* It's possible that we incorrectly decided a .plt reloc was
1542 needed for an R_X86_64_PC32 reloc to a non-function sym in
1543 check_relocs. We can't decide accurately between function and
1544 non-function syms in check-relocs; Objects loaded later in
1545 the link may change h->type. So fix it now. */
1546 h
->plt
.offset
= (bfd_vma
) -1;
1548 /* If this is a weak symbol, and there is a real definition, the
1549 processor independent code will have arranged for us to see the
1550 real definition first, and we can just use the same value. */
1551 if (h
->u
.weakdef
!= NULL
)
1553 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1554 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1555 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1556 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1557 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1558 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1562 /* This is a reference to a symbol defined by a dynamic object which
1563 is not a function. */
1565 /* If we are creating a shared library, we must presume that the
1566 only references to the symbol are via the global offset table.
1567 For such cases we need not do anything here; the relocations will
1568 be handled correctly by relocate_section. */
1572 /* If there are no references to this symbol that do not use the
1573 GOT, we don't need to generate a copy reloc. */
1574 if (!h
->non_got_ref
)
1577 /* If -z nocopyreloc was given, we won't generate them either. */
1578 if (info
->nocopyreloc
)
1584 if (ELIMINATE_COPY_RELOCS
)
1586 struct elf64_x86_64_link_hash_entry
* eh
;
1587 struct elf64_x86_64_dyn_relocs
*p
;
1589 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1590 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1592 s
= p
->sec
->output_section
;
1593 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1597 /* If we didn't find any dynamic relocs in read-only sections, then
1598 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1608 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1609 h
->root
.root
.string
);
1613 /* We must allocate the symbol in our .dynbss section, which will
1614 become part of the .bss section of the executable. There will be
1615 an entry for this symbol in the .dynsym section. The dynamic
1616 object will contain position independent code, so all references
1617 from the dynamic object to this symbol will go through the global
1618 offset table. The dynamic linker will use the .dynsym entry to
1619 determine the address it must put in the global offset table, so
1620 both the dynamic object and the regular object will refer to the
1621 same memory location for the variable. */
1623 htab
= elf64_x86_64_hash_table (info
);
1625 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1626 to copy the initial value out of the dynamic object and into the
1627 runtime process image. */
1628 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1630 htab
->srelbss
->size
+= sizeof (Elf64_External_Rela
);
1636 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1639 /* Allocate space in .plt, .got and associated reloc sections for
1643 allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1645 struct bfd_link_info
*info
;
1646 struct elf64_x86_64_link_hash_table
*htab
;
1647 struct elf64_x86_64_link_hash_entry
*eh
;
1648 struct elf64_x86_64_dyn_relocs
*p
;
1650 if (h
->root
.type
== bfd_link_hash_indirect
)
1653 if (h
->root
.type
== bfd_link_hash_warning
)
1654 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1656 info
= (struct bfd_link_info
*) inf
;
1657 htab
= elf64_x86_64_hash_table (info
);
1659 if (htab
->elf
.dynamic_sections_created
1660 && h
->plt
.refcount
> 0)
1662 /* Make sure this symbol is output as a dynamic symbol.
1663 Undefined weak syms won't yet be marked as dynamic. */
1664 if (h
->dynindx
== -1
1665 && !h
->forced_local
)
1667 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1672 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1674 asection
*s
= htab
->splt
;
1676 /* If this is the first .plt entry, make room for the special
1679 s
->size
+= PLT_ENTRY_SIZE
;
1681 h
->plt
.offset
= s
->size
;
1683 /* If this symbol is not defined in a regular file, and we are
1684 not generating a shared library, then set the symbol to this
1685 location in the .plt. This is required to make function
1686 pointers compare as equal between the normal executable and
1687 the shared library. */
1691 h
->root
.u
.def
.section
= s
;
1692 h
->root
.u
.def
.value
= h
->plt
.offset
;
1695 /* Make room for this entry. */
1696 s
->size
+= PLT_ENTRY_SIZE
;
1698 /* We also need to make an entry in the .got.plt section, which
1699 will be placed in the .got section by the linker script. */
1700 htab
->sgotplt
->size
+= GOT_ENTRY_SIZE
;
1702 /* We also need to make an entry in the .rela.plt section. */
1703 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
1704 htab
->srelplt
->reloc_count
++;
1708 h
->plt
.offset
= (bfd_vma
) -1;
1714 h
->plt
.offset
= (bfd_vma
) -1;
1718 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1719 eh
->tlsdesc_got
= (bfd_vma
) -1;
1721 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1722 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1723 if (h
->got
.refcount
> 0
1726 && elf64_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
1727 h
->got
.offset
= (bfd_vma
) -1;
1728 else if (h
->got
.refcount
> 0)
1732 int tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1734 /* Make sure this symbol is output as a dynamic symbol.
1735 Undefined weak syms won't yet be marked as dynamic. */
1736 if (h
->dynindx
== -1
1737 && !h
->forced_local
)
1739 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1743 if (GOT_TLS_GDESC_P (tls_type
))
1745 eh
->tlsdesc_got
= htab
->sgotplt
->size
1746 - elf64_x86_64_compute_jump_table_size (htab
);
1747 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
1748 h
->got
.offset
= (bfd_vma
) -2;
1750 if (! GOT_TLS_GDESC_P (tls_type
)
1751 || GOT_TLS_GD_P (tls_type
))
1754 h
->got
.offset
= s
->size
;
1755 s
->size
+= GOT_ENTRY_SIZE
;
1756 if (GOT_TLS_GD_P (tls_type
))
1757 s
->size
+= GOT_ENTRY_SIZE
;
1759 dyn
= htab
->elf
.dynamic_sections_created
;
1760 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1762 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1763 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
1764 || tls_type
== GOT_TLS_IE
)
1765 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
1766 else if (GOT_TLS_GD_P (tls_type
))
1767 htab
->srelgot
->size
+= 2 * sizeof (Elf64_External_Rela
);
1768 else if (! GOT_TLS_GDESC_P (tls_type
)
1769 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1770 || h
->root
.type
!= bfd_link_hash_undefweak
)
1772 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
1773 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
1774 if (GOT_TLS_GDESC_P (tls_type
))
1776 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
1777 htab
->tlsdesc_plt
= (bfd_vma
) -1;
1781 h
->got
.offset
= (bfd_vma
) -1;
1783 if (eh
->dyn_relocs
== NULL
)
1786 /* In the shared -Bsymbolic case, discard space allocated for
1787 dynamic pc-relative relocs against symbols which turn out to be
1788 defined in regular objects. For the normal shared case, discard
1789 space for pc-relative relocs that have become local due to symbol
1790 visibility changes. */
1794 /* Relocs that use pc_count are those that appear on a call
1795 insn, or certain REL relocs that can generated via assembly.
1796 We want calls to protected symbols to resolve directly to the
1797 function rather than going via the plt. If people want
1798 function pointer comparisons to work as expected then they
1799 should avoid writing weird assembly. */
1800 if (SYMBOL_CALLS_LOCAL (info
, h
))
1802 struct elf64_x86_64_dyn_relocs
**pp
;
1804 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1806 p
->count
-= p
->pc_count
;
1815 /* Also discard relocs on undefined weak syms with non-default
1817 if (eh
->dyn_relocs
!= NULL
1818 && h
->root
.type
== bfd_link_hash_undefweak
)
1820 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
1821 eh
->dyn_relocs
= NULL
;
1823 /* Make sure undefined weak symbols are output as a dynamic
1825 else if (h
->dynindx
== -1
1826 && !h
->forced_local
)
1828 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1833 else if (ELIMINATE_COPY_RELOCS
)
1835 /* For the non-shared case, discard space for relocs against
1836 symbols which turn out to need copy relocs or are not
1842 || (htab
->elf
.dynamic_sections_created
1843 && (h
->root
.type
== bfd_link_hash_undefweak
1844 || h
->root
.type
== bfd_link_hash_undefined
))))
1846 /* Make sure this symbol is output as a dynamic symbol.
1847 Undefined weak syms won't yet be marked as dynamic. */
1848 if (h
->dynindx
== -1
1849 && !h
->forced_local
)
1851 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1855 /* If that succeeded, we know we'll be keeping all the
1857 if (h
->dynindx
!= -1)
1861 eh
->dyn_relocs
= NULL
;
1866 /* Finally, allocate space. */
1867 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1869 asection
*sreloc
= elf_section_data (p
->sec
)->sreloc
;
1870 sreloc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
1876 /* Find any dynamic relocs that apply to read-only sections. */
1879 readonly_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1881 struct elf64_x86_64_link_hash_entry
*eh
;
1882 struct elf64_x86_64_dyn_relocs
*p
;
1884 if (h
->root
.type
== bfd_link_hash_warning
)
1885 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1887 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1888 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1890 asection
*s
= p
->sec
->output_section
;
1892 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1894 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
1896 info
->flags
|= DF_TEXTREL
;
1898 /* Not an error, just cut short the traversal. */
1905 /* Set the sizes of the dynamic sections. */
1908 elf64_x86_64_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1909 struct bfd_link_info
*info
)
1911 struct elf64_x86_64_link_hash_table
*htab
;
1917 htab
= elf64_x86_64_hash_table (info
);
1918 dynobj
= htab
->elf
.dynobj
;
1922 if (htab
->elf
.dynamic_sections_created
)
1924 /* Set the contents of the .interp section to the interpreter. */
1925 if (info
->executable
)
1927 s
= bfd_get_section_by_name (dynobj
, ".interp");
1930 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1931 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1935 /* Set up .got offsets for local syms, and space for local dynamic
1937 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
1939 bfd_signed_vma
*local_got
;
1940 bfd_signed_vma
*end_local_got
;
1941 char *local_tls_type
;
1942 bfd_vma
*local_tlsdesc_gotent
;
1943 bfd_size_type locsymcount
;
1944 Elf_Internal_Shdr
*symtab_hdr
;
1947 if (! is_x86_64_elf (ibfd
))
1950 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
1952 struct elf64_x86_64_dyn_relocs
*p
;
1954 for (p
= (struct elf64_x86_64_dyn_relocs
*)
1955 (elf_section_data (s
)->local_dynrel
);
1959 if (!bfd_is_abs_section (p
->sec
)
1960 && bfd_is_abs_section (p
->sec
->output_section
))
1962 /* Input section has been discarded, either because
1963 it is a copy of a linkonce section or due to
1964 linker script /DISCARD/, so we'll be discarding
1967 else if (p
->count
!= 0)
1969 srel
= elf_section_data (p
->sec
)->sreloc
;
1970 srel
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
1971 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
1972 info
->flags
|= DF_TEXTREL
;
1978 local_got
= elf_local_got_refcounts (ibfd
);
1982 symtab_hdr
= &elf_symtab_hdr (ibfd
);
1983 locsymcount
= symtab_hdr
->sh_info
;
1984 end_local_got
= local_got
+ locsymcount
;
1985 local_tls_type
= elf64_x86_64_local_got_tls_type (ibfd
);
1986 local_tlsdesc_gotent
= elf64_x86_64_local_tlsdesc_gotent (ibfd
);
1988 srel
= htab
->srelgot
;
1989 for (; local_got
< end_local_got
;
1990 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
1992 *local_tlsdesc_gotent
= (bfd_vma
) -1;
1995 if (GOT_TLS_GDESC_P (*local_tls_type
))
1997 *local_tlsdesc_gotent
= htab
->sgotplt
->size
1998 - elf64_x86_64_compute_jump_table_size (htab
);
1999 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2000 *local_got
= (bfd_vma
) -2;
2002 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2003 || GOT_TLS_GD_P (*local_tls_type
))
2005 *local_got
= s
->size
;
2006 s
->size
+= GOT_ENTRY_SIZE
;
2007 if (GOT_TLS_GD_P (*local_tls_type
))
2008 s
->size
+= GOT_ENTRY_SIZE
;
2011 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2012 || *local_tls_type
== GOT_TLS_IE
)
2014 if (GOT_TLS_GDESC_P (*local_tls_type
))
2016 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
2017 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2019 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2020 || GOT_TLS_GD_P (*local_tls_type
))
2021 srel
->size
+= sizeof (Elf64_External_Rela
);
2025 *local_got
= (bfd_vma
) -1;
2029 if (htab
->tls_ld_got
.refcount
> 0)
2031 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2033 htab
->tls_ld_got
.offset
= htab
->sgot
->size
;
2034 htab
->sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2035 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2038 htab
->tls_ld_got
.offset
= -1;
2040 /* Allocate global sym .plt and .got entries, and space for global
2041 sym dynamic relocs. */
2042 elf_link_hash_traverse (&htab
->elf
, allocate_dynrelocs
, (PTR
) info
);
2044 /* For every jump slot reserved in the sgotplt, reloc_count is
2045 incremented. However, when we reserve space for TLS descriptors,
2046 it's not incremented, so in order to compute the space reserved
2047 for them, it suffices to multiply the reloc count by the jump
2050 htab
->sgotplt_jump_table_size
2051 = elf64_x86_64_compute_jump_table_size (htab
);
2053 if (htab
->tlsdesc_plt
)
2055 /* If we're not using lazy TLS relocations, don't generate the
2056 PLT and GOT entries they require. */
2057 if ((info
->flags
& DF_BIND_NOW
))
2058 htab
->tlsdesc_plt
= 0;
2061 htab
->tlsdesc_got
= htab
->sgot
->size
;
2062 htab
->sgot
->size
+= GOT_ENTRY_SIZE
;
2063 /* Reserve room for the initial entry.
2064 FIXME: we could probably do away with it in this case. */
2065 if (htab
->splt
->size
== 0)
2066 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
2067 htab
->tlsdesc_plt
= htab
->splt
->size
;
2068 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
2072 /* We now have determined the sizes of the various dynamic sections.
2073 Allocate memory for them. */
2075 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2077 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2082 || s
== htab
->sgotplt
2083 || s
== htab
->sdynbss
)
2085 /* Strip this section if we don't need it; see the
2088 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2090 if (s
->size
!= 0 && s
!= htab
->srelplt
)
2093 /* We use the reloc_count field as a counter if we need
2094 to copy relocs into the output file. */
2095 if (s
!= htab
->srelplt
)
2100 /* It's not one of our sections, so don't allocate space. */
2106 /* If we don't need this section, strip it from the
2107 output file. This is mostly to handle .rela.bss and
2108 .rela.plt. We must create both sections in
2109 create_dynamic_sections, because they must be created
2110 before the linker maps input sections to output
2111 sections. The linker does that before
2112 adjust_dynamic_symbol is called, and it is that
2113 function which decides whether anything needs to go
2114 into these sections. */
2116 s
->flags
|= SEC_EXCLUDE
;
2120 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2123 /* Allocate memory for the section contents. We use bfd_zalloc
2124 here in case unused entries are not reclaimed before the
2125 section's contents are written out. This should not happen,
2126 but this way if it does, we get a R_X86_64_NONE reloc instead
2128 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2129 if (s
->contents
== NULL
)
2133 if (htab
->elf
.dynamic_sections_created
)
2135 /* Add some entries to the .dynamic section. We fill in the
2136 values later, in elf64_x86_64_finish_dynamic_sections, but we
2137 must add the entries now so that we get the correct size for
2138 the .dynamic section. The DT_DEBUG entry is filled in by the
2139 dynamic linker and used by the debugger. */
2140 #define add_dynamic_entry(TAG, VAL) \
2141 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2143 if (info
->executable
)
2145 if (!add_dynamic_entry (DT_DEBUG
, 0))
2149 if (htab
->splt
->size
!= 0)
2151 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2152 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2153 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2154 || !add_dynamic_entry (DT_JMPREL
, 0))
2157 if (htab
->tlsdesc_plt
2158 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2159 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2165 if (!add_dynamic_entry (DT_RELA
, 0)
2166 || !add_dynamic_entry (DT_RELASZ
, 0)
2167 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf64_External_Rela
)))
2170 /* If any dynamic relocs apply to a read-only section,
2171 then we need a DT_TEXTREL entry. */
2172 if ((info
->flags
& DF_TEXTREL
) == 0)
2173 elf_link_hash_traverse (&htab
->elf
, readonly_dynrelocs
,
2176 if ((info
->flags
& DF_TEXTREL
) != 0)
2178 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2183 #undef add_dynamic_entry
2189 elf64_x86_64_always_size_sections (bfd
*output_bfd
,
2190 struct bfd_link_info
*info
)
2192 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2196 struct elf_link_hash_entry
*tlsbase
;
2198 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2199 "_TLS_MODULE_BASE_",
2200 FALSE
, FALSE
, FALSE
);
2202 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2204 struct bfd_link_hash_entry
*bh
= NULL
;
2205 const struct elf_backend_data
*bed
2206 = get_elf_backend_data (output_bfd
);
2208 if (!(_bfd_generic_link_add_one_symbol
2209 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2210 tls_sec
, 0, NULL
, FALSE
,
2211 bed
->collect
, &bh
)))
2214 elf64_x86_64_hash_table (info
)->tls_module_base
= bh
;
2216 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2217 tlsbase
->def_regular
= 1;
2218 tlsbase
->other
= STV_HIDDEN
;
2219 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2226 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2227 executables. Rather than setting it to the beginning of the TLS
2228 section, we have to set it to the end. This function may be called
2229 multiple times, it is idempotent. */
2232 set_tls_module_base (struct bfd_link_info
*info
)
2234 struct bfd_link_hash_entry
*base
;
2236 if (!info
->executable
)
2239 base
= elf64_x86_64_hash_table (info
)->tls_module_base
;
2244 base
->u
.def
.value
= elf_hash_table (info
)->tls_size
;
2247 /* Return the base VMA address which should be subtracted from real addresses
2248 when resolving @dtpoff relocation.
2249 This is PT_TLS segment p_vaddr. */
2252 dtpoff_base (struct bfd_link_info
*info
)
2254 /* If tls_sec is NULL, we should have signalled an error already. */
2255 if (elf_hash_table (info
)->tls_sec
== NULL
)
2257 return elf_hash_table (info
)->tls_sec
->vma
;
2260 /* Return the relocation value for @tpoff relocation
2261 if STT_TLS virtual address is ADDRESS. */
2264 tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2266 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2268 /* If tls_segment is NULL, we should have signalled an error already. */
2269 if (htab
->tls_sec
== NULL
)
2271 return address
- htab
->tls_size
- htab
->tls_sec
->vma
;
2274 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2278 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2280 /* Opcode Instruction
2283 0x0f 0x8x conditional jump */
2285 && (contents
[offset
- 1] == 0xe8
2286 || contents
[offset
- 1] == 0xe9))
2288 && contents
[offset
- 2] == 0x0f
2289 && (contents
[offset
- 1] & 0xf0) == 0x80));
2292 /* Relocate an x86_64 ELF section. */
2295 elf64_x86_64_relocate_section (bfd
*output_bfd
, struct bfd_link_info
*info
,
2296 bfd
*input_bfd
, asection
*input_section
,
2297 bfd_byte
*contents
, Elf_Internal_Rela
*relocs
,
2298 Elf_Internal_Sym
*local_syms
,
2299 asection
**local_sections
)
2301 struct elf64_x86_64_link_hash_table
*htab
;
2302 Elf_Internal_Shdr
*symtab_hdr
;
2303 struct elf_link_hash_entry
**sym_hashes
;
2304 bfd_vma
*local_got_offsets
;
2305 bfd_vma
*local_tlsdesc_gotents
;
2306 Elf_Internal_Rela
*rel
;
2307 Elf_Internal_Rela
*relend
;
2309 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2311 htab
= elf64_x86_64_hash_table (info
);
2312 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2313 sym_hashes
= elf_sym_hashes (input_bfd
);
2314 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2315 local_tlsdesc_gotents
= elf64_x86_64_local_tlsdesc_gotent (input_bfd
);
2317 set_tls_module_base (info
);
2320 relend
= relocs
+ input_section
->reloc_count
;
2321 for (; rel
< relend
; rel
++)
2323 unsigned int r_type
;
2324 reloc_howto_type
*howto
;
2325 unsigned long r_symndx
;
2326 struct elf_link_hash_entry
*h
;
2327 Elf_Internal_Sym
*sym
;
2329 bfd_vma off
, offplt
;
2331 bfd_boolean unresolved_reloc
;
2332 bfd_reloc_status_type r
;
2335 r_type
= ELF64_R_TYPE (rel
->r_info
);
2336 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2337 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2340 if (r_type
>= R_X86_64_max
)
2342 bfd_set_error (bfd_error_bad_value
);
2346 howto
= x86_64_elf_howto_table
+ r_type
;
2347 r_symndx
= ELF64_R_SYM (rel
->r_info
);
2351 unresolved_reloc
= FALSE
;
2352 if (r_symndx
< symtab_hdr
->sh_info
)
2354 sym
= local_syms
+ r_symndx
;
2355 sec
= local_sections
[r_symndx
];
2357 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2363 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2364 r_symndx
, symtab_hdr
, sym_hashes
,
2366 unresolved_reloc
, warned
);
2369 if (sec
!= NULL
&& elf_discarded_section (sec
))
2371 /* For relocs against symbols from removed linkonce sections,
2372 or sections discarded by a linker script, we just want the
2373 section contents zeroed. Avoid any special processing. */
2374 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2380 if (info
->relocatable
)
2383 /* When generating a shared object, the relocations handled here are
2384 copied into the output file to be resolved at run time. */
2388 case R_X86_64_GOT32
:
2389 case R_X86_64_GOT64
:
2390 /* Relocation is to the entry for this symbol in the global
2392 case R_X86_64_GOTPCREL
:
2393 case R_X86_64_GOTPCREL64
:
2394 /* Use global offset table entry as symbol value. */
2395 case R_X86_64_GOTPLT64
:
2396 /* This is the same as GOT64 for relocation purposes, but
2397 indicates the existence of a PLT entry. The difficulty is,
2398 that we must calculate the GOT slot offset from the PLT
2399 offset, if this symbol got a PLT entry (it was global).
2400 Additionally if it's computed from the PLT entry, then that
2401 GOT offset is relative to .got.plt, not to .got. */
2402 base_got
= htab
->sgot
;
2404 if (htab
->sgot
== NULL
)
2411 off
= h
->got
.offset
;
2413 && h
->plt
.offset
!= (bfd_vma
)-1
2414 && off
== (bfd_vma
)-1)
2416 /* We can't use h->got.offset here to save
2417 state, or even just remember the offset, as
2418 finish_dynamic_symbol would use that as offset into
2420 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2421 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2422 base_got
= htab
->sgotplt
;
2425 dyn
= htab
->elf
.dynamic_sections_created
;
2427 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
2429 && SYMBOL_REFERENCES_LOCAL (info
, h
))
2430 || (ELF_ST_VISIBILITY (h
->other
)
2431 && h
->root
.type
== bfd_link_hash_undefweak
))
2433 /* This is actually a static link, or it is a -Bsymbolic
2434 link and the symbol is defined locally, or the symbol
2435 was forced to be local because of a version file. We
2436 must initialize this entry in the global offset table.
2437 Since the offset must always be a multiple of 8, we
2438 use the least significant bit to record whether we
2439 have initialized it already.
2441 When doing a dynamic link, we create a .rela.got
2442 relocation entry to initialize the value. This is
2443 done in the finish_dynamic_symbol routine. */
2448 bfd_put_64 (output_bfd
, relocation
,
2449 base_got
->contents
+ off
);
2450 /* Note that this is harmless for the GOTPLT64 case,
2451 as -1 | 1 still is -1. */
2456 unresolved_reloc
= FALSE
;
2460 if (local_got_offsets
== NULL
)
2463 off
= local_got_offsets
[r_symndx
];
2465 /* The offset must always be a multiple of 8. We use
2466 the least significant bit to record whether we have
2467 already generated the necessary reloc. */
2472 bfd_put_64 (output_bfd
, relocation
,
2473 base_got
->contents
+ off
);
2478 Elf_Internal_Rela outrel
;
2481 /* We need to generate a R_X86_64_RELATIVE reloc
2482 for the dynamic linker. */
2487 outrel
.r_offset
= (base_got
->output_section
->vma
2488 + base_got
->output_offset
2490 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
2491 outrel
.r_addend
= relocation
;
2493 loc
+= s
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2494 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2497 local_got_offsets
[r_symndx
] |= 1;
2501 if (off
>= (bfd_vma
) -2)
2504 relocation
= base_got
->output_section
->vma
2505 + base_got
->output_offset
+ off
;
2506 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
2507 relocation
-= htab
->sgotplt
->output_section
->vma
2508 - htab
->sgotplt
->output_offset
;
2512 case R_X86_64_GOTOFF64
:
2513 /* Relocation is relative to the start of the global offset
2516 /* Check to make sure it isn't a protected function symbol
2517 for shared library since it may not be local when used
2518 as function address. */
2522 && h
->type
== STT_FUNC
2523 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
2525 (*_bfd_error_handler
)
2526 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
2527 input_bfd
, h
->root
.root
.string
);
2528 bfd_set_error (bfd_error_bad_value
);
2532 /* Note that sgot is not involved in this
2533 calculation. We always want the start of .got.plt. If we
2534 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2535 permitted by the ABI, we might have to change this
2537 relocation
-= htab
->sgotplt
->output_section
->vma
2538 + htab
->sgotplt
->output_offset
;
2541 case R_X86_64_GOTPC32
:
2542 case R_X86_64_GOTPC64
:
2543 /* Use global offset table as symbol value. */
2544 relocation
= htab
->sgotplt
->output_section
->vma
2545 + htab
->sgotplt
->output_offset
;
2546 unresolved_reloc
= FALSE
;
2549 case R_X86_64_PLTOFF64
:
2550 /* Relocation is PLT entry relative to GOT. For local
2551 symbols it's the symbol itself relative to GOT. */
2553 /* See PLT32 handling. */
2554 && h
->plt
.offset
!= (bfd_vma
) -1
2555 && htab
->splt
!= NULL
)
2557 relocation
= (htab
->splt
->output_section
->vma
2558 + htab
->splt
->output_offset
2560 unresolved_reloc
= FALSE
;
2563 relocation
-= htab
->sgotplt
->output_section
->vma
2564 + htab
->sgotplt
->output_offset
;
2567 case R_X86_64_PLT32
:
2568 /* Relocation is to the entry for this symbol in the
2569 procedure linkage table. */
2571 /* Resolve a PLT32 reloc against a local symbol directly,
2572 without using the procedure linkage table. */
2576 if (h
->plt
.offset
== (bfd_vma
) -1
2577 || htab
->splt
== NULL
)
2579 /* We didn't make a PLT entry for this symbol. This
2580 happens when statically linking PIC code, or when
2581 using -Bsymbolic. */
2585 relocation
= (htab
->splt
->output_section
->vma
2586 + htab
->splt
->output_offset
2588 unresolved_reloc
= FALSE
;
2595 && (input_section
->flags
& SEC_ALLOC
) != 0
2596 && (input_section
->flags
& SEC_READONLY
) != 0
2599 bfd_boolean fail
= FALSE
;
2601 = (r_type
== R_X86_64_PC32
2602 && is_32bit_relative_branch (contents
, rel
->r_offset
));
2604 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
2606 /* Symbol is referenced locally. Make sure it is
2607 defined locally or for a branch. */
2608 fail
= !h
->def_regular
&& !branch
;
2612 /* Symbol isn't referenced locally. We only allow
2613 branch to symbol with non-default visibility. */
2615 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
2622 const char *pic
= "";
2624 switch (ELF_ST_VISIBILITY (h
->other
))
2627 v
= _("hidden symbol");
2630 v
= _("internal symbol");
2633 v
= _("protected symbol");
2637 pic
= _("; recompile with -fPIC");
2642 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
2644 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
2646 (*_bfd_error_handler
) (fmt
, input_bfd
,
2647 x86_64_elf_howto_table
[r_type
].name
,
2648 v
, h
->root
.root
.string
, pic
);
2649 bfd_set_error (bfd_error_bad_value
);
2660 /* FIXME: The ABI says the linker should make sure the value is
2661 the same when it's zeroextended to 64 bit. */
2663 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2668 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2669 || h
->root
.type
!= bfd_link_hash_undefweak
)
2670 && ((r_type
!= R_X86_64_PC8
2671 && r_type
!= R_X86_64_PC16
2672 && r_type
!= R_X86_64_PC32
2673 && r_type
!= R_X86_64_PC64
)
2674 || !SYMBOL_CALLS_LOCAL (info
, h
)))
2675 || (ELIMINATE_COPY_RELOCS
2682 || h
->root
.type
== bfd_link_hash_undefweak
2683 || h
->root
.type
== bfd_link_hash_undefined
)))
2685 Elf_Internal_Rela outrel
;
2687 bfd_boolean skip
, relocate
;
2690 /* When generating a shared object, these relocations
2691 are copied into the output file to be resolved at run
2697 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2699 if (outrel
.r_offset
== (bfd_vma
) -1)
2701 else if (outrel
.r_offset
== (bfd_vma
) -2)
2702 skip
= TRUE
, relocate
= TRUE
;
2704 outrel
.r_offset
+= (input_section
->output_section
->vma
2705 + input_section
->output_offset
);
2708 memset (&outrel
, 0, sizeof outrel
);
2710 /* h->dynindx may be -1 if this symbol was marked to
2714 && (r_type
== R_X86_64_PC8
2715 || r_type
== R_X86_64_PC16
2716 || r_type
== R_X86_64_PC32
2717 || r_type
== R_X86_64_PC64
2719 || !SYMBOLIC_BIND (info
, h
)
2720 || !h
->def_regular
))
2722 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
2723 outrel
.r_addend
= rel
->r_addend
;
2727 /* This symbol is local, or marked to become local. */
2728 if (r_type
== R_X86_64_64
)
2731 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
2732 outrel
.r_addend
= relocation
+ rel
->r_addend
;
2738 if (bfd_is_abs_section (sec
))
2740 else if (sec
== NULL
|| sec
->owner
== NULL
)
2742 bfd_set_error (bfd_error_bad_value
);
2749 /* We are turning this relocation into one
2750 against a section symbol. It would be
2751 proper to subtract the symbol's value,
2752 osec->vma, from the emitted reloc addend,
2753 but ld.so expects buggy relocs. */
2754 osec
= sec
->output_section
;
2755 sindx
= elf_section_data (osec
)->dynindx
;
2758 asection
*oi
= htab
->elf
.text_index_section
;
2759 sindx
= elf_section_data (oi
)->dynindx
;
2761 BFD_ASSERT (sindx
!= 0);
2764 outrel
.r_info
= ELF64_R_INFO (sindx
, r_type
);
2765 outrel
.r_addend
= relocation
+ rel
->r_addend
;
2769 sreloc
= elf_section_data (input_section
)->sreloc
;
2773 loc
= sreloc
->contents
;
2774 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2775 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2777 /* If this reloc is against an external symbol, we do
2778 not want to fiddle with the addend. Otherwise, we
2779 need to include the symbol value so that it becomes
2780 an addend for the dynamic reloc. */
2787 case R_X86_64_TLSGD
:
2788 case R_X86_64_GOTPC32_TLSDESC
:
2789 case R_X86_64_TLSDESC_CALL
:
2790 case R_X86_64_GOTTPOFF
:
2791 tls_type
= GOT_UNKNOWN
;
2792 if (h
== NULL
&& local_got_offsets
)
2793 tls_type
= elf64_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
2795 tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
2797 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
2798 input_section
, contents
,
2799 symtab_hdr
, sym_hashes
,
2800 &r_type
, tls_type
, rel
,
2804 if (r_type
== R_X86_64_TPOFF32
)
2806 bfd_vma roff
= rel
->r_offset
;
2808 BFD_ASSERT (! unresolved_reloc
);
2810 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
2812 /* GD->LE transition.
2813 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
2814 .word 0x6666; rex64; call __tls_get_addr
2817 leaq foo@tpoff(%rax), %rax */
2818 memcpy (contents
+ roff
- 4,
2819 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
2821 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2822 contents
+ roff
+ 8);
2823 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
2827 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
2829 /* GDesc -> LE transition.
2830 It's originally something like:
2831 leaq x@tlsdesc(%rip), %rax
2837 unsigned int val
, type
, type2
;
2839 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
2840 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
2841 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
2842 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
2843 contents
+ roff
- 3);
2844 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
2845 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
2846 contents
+ roff
- 1);
2847 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2851 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
2853 /* GDesc -> LE transition.
2858 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
2859 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
2862 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
2864 /* IE->LE transition:
2865 Originally it can be one of:
2866 movq foo@gottpoff(%rip), %reg
2867 addq foo@gottpoff(%rip), %reg
2870 leaq foo(%reg), %reg
2873 unsigned int val
, type
, reg
;
2875 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
2876 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
2877 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
2883 bfd_put_8 (output_bfd
, 0x49,
2884 contents
+ roff
- 3);
2885 bfd_put_8 (output_bfd
, 0xc7,
2886 contents
+ roff
- 2);
2887 bfd_put_8 (output_bfd
, 0xc0 | reg
,
2888 contents
+ roff
- 1);
2892 /* addq -> addq - addressing with %rsp/%r12 is
2895 bfd_put_8 (output_bfd
, 0x49,
2896 contents
+ roff
- 3);
2897 bfd_put_8 (output_bfd
, 0x81,
2898 contents
+ roff
- 2);
2899 bfd_put_8 (output_bfd
, 0xc0 | reg
,
2900 contents
+ roff
- 1);
2906 bfd_put_8 (output_bfd
, 0x4d,
2907 contents
+ roff
- 3);
2908 bfd_put_8 (output_bfd
, 0x8d,
2909 contents
+ roff
- 2);
2910 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
2911 contents
+ roff
- 1);
2913 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2921 if (htab
->sgot
== NULL
)
2926 off
= h
->got
.offset
;
2927 offplt
= elf64_x86_64_hash_entry (h
)->tlsdesc_got
;
2931 if (local_got_offsets
== NULL
)
2934 off
= local_got_offsets
[r_symndx
];
2935 offplt
= local_tlsdesc_gotents
[r_symndx
];
2942 Elf_Internal_Rela outrel
;
2947 if (htab
->srelgot
== NULL
)
2950 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
2952 if (GOT_TLS_GDESC_P (tls_type
))
2954 outrel
.r_info
= ELF64_R_INFO (indx
, R_X86_64_TLSDESC
);
2955 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
2956 + 2 * GOT_ENTRY_SIZE
<= htab
->sgotplt
->size
);
2957 outrel
.r_offset
= (htab
->sgotplt
->output_section
->vma
2958 + htab
->sgotplt
->output_offset
2960 + htab
->sgotplt_jump_table_size
);
2961 sreloc
= htab
->srelplt
;
2962 loc
= sreloc
->contents
;
2963 loc
+= sreloc
->reloc_count
++
2964 * sizeof (Elf64_External_Rela
);
2965 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
2966 <= sreloc
->contents
+ sreloc
->size
);
2968 outrel
.r_addend
= relocation
- dtpoff_base (info
);
2970 outrel
.r_addend
= 0;
2971 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2974 sreloc
= htab
->srelgot
;
2976 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2977 + htab
->sgot
->output_offset
+ off
);
2979 if (GOT_TLS_GD_P (tls_type
))
2980 dr_type
= R_X86_64_DTPMOD64
;
2981 else if (GOT_TLS_GDESC_P (tls_type
))
2984 dr_type
= R_X86_64_TPOFF64
;
2986 bfd_put_64 (output_bfd
, 0, htab
->sgot
->contents
+ off
);
2987 outrel
.r_addend
= 0;
2988 if ((dr_type
== R_X86_64_TPOFF64
2989 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
2990 outrel
.r_addend
= relocation
- dtpoff_base (info
);
2991 outrel
.r_info
= ELF64_R_INFO (indx
, dr_type
);
2993 loc
= sreloc
->contents
;
2994 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2995 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
2996 <= sreloc
->contents
+ sreloc
->size
);
2997 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2999 if (GOT_TLS_GD_P (tls_type
))
3003 BFD_ASSERT (! unresolved_reloc
);
3004 bfd_put_64 (output_bfd
,
3005 relocation
- dtpoff_base (info
),
3006 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3010 bfd_put_64 (output_bfd
, 0,
3011 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3012 outrel
.r_info
= ELF64_R_INFO (indx
,
3014 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3015 sreloc
->reloc_count
++;
3016 loc
+= sizeof (Elf64_External_Rela
);
3017 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3018 <= sreloc
->contents
+ sreloc
->size
);
3019 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3027 local_got_offsets
[r_symndx
] |= 1;
3030 if (off
>= (bfd_vma
) -2
3031 && ! GOT_TLS_GDESC_P (tls_type
))
3033 if (r_type
== ELF64_R_TYPE (rel
->r_info
))
3035 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3036 || r_type
== R_X86_64_TLSDESC_CALL
)
3037 relocation
= htab
->sgotplt
->output_section
->vma
3038 + htab
->sgotplt
->output_offset
3039 + offplt
+ htab
->sgotplt_jump_table_size
;
3041 relocation
= htab
->sgot
->output_section
->vma
3042 + htab
->sgot
->output_offset
+ off
;
3043 unresolved_reloc
= FALSE
;
3047 bfd_vma roff
= rel
->r_offset
;
3049 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3051 /* GD->IE transition.
3052 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3053 .word 0x6666; rex64; call __tls_get_addr@plt
3056 addq foo@gottpoff(%rip), %rax */
3057 memcpy (contents
+ roff
- 4,
3058 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3061 relocation
= (htab
->sgot
->output_section
->vma
3062 + htab
->sgot
->output_offset
+ off
3064 - input_section
->output_section
->vma
3065 - input_section
->output_offset
3067 bfd_put_32 (output_bfd
, relocation
,
3068 contents
+ roff
+ 8);
3069 /* Skip R_X86_64_PLT32. */
3073 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3075 /* GDesc -> IE transition.
3076 It's originally something like:
3077 leaq x@tlsdesc(%rip), %rax
3080 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3083 unsigned int val
, type
, type2
;
3085 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3086 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3087 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3089 /* Now modify the instruction as appropriate. To
3090 turn a leaq into a movq in the form we use it, it
3091 suffices to change the second byte from 0x8d to
3093 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3095 bfd_put_32 (output_bfd
,
3096 htab
->sgot
->output_section
->vma
3097 + htab
->sgot
->output_offset
+ off
3099 - input_section
->output_section
->vma
3100 - input_section
->output_offset
3105 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3107 /* GDesc -> IE transition.
3114 unsigned int val
, type
;
3116 type
= bfd_get_8 (input_bfd
, contents
+ roff
);
3117 val
= bfd_get_8 (input_bfd
, contents
+ roff
+ 1);
3118 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3119 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3127 case R_X86_64_TLSLD
:
3128 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3129 input_section
, contents
,
3130 symtab_hdr
, sym_hashes
,
3131 &r_type
, GOT_UNKNOWN
,
3135 if (r_type
!= R_X86_64_TLSLD
)
3137 /* LD->LE transition:
3138 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3140 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3142 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3143 memcpy (contents
+ rel
->r_offset
- 3,
3144 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3145 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3150 if (htab
->sgot
== NULL
)
3153 off
= htab
->tls_ld_got
.offset
;
3158 Elf_Internal_Rela outrel
;
3161 if (htab
->srelgot
== NULL
)
3164 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3165 + htab
->sgot
->output_offset
+ off
);
3167 bfd_put_64 (output_bfd
, 0,
3168 htab
->sgot
->contents
+ off
);
3169 bfd_put_64 (output_bfd
, 0,
3170 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3171 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_DTPMOD64
);
3172 outrel
.r_addend
= 0;
3173 loc
= htab
->srelgot
->contents
;
3174 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3175 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3176 htab
->tls_ld_got
.offset
|= 1;
3178 relocation
= htab
->sgot
->output_section
->vma
3179 + htab
->sgot
->output_offset
+ off
;
3180 unresolved_reloc
= FALSE
;
3183 case R_X86_64_DTPOFF32
:
3184 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
3185 relocation
-= dtpoff_base (info
);
3187 relocation
= tpoff (info
, relocation
);
3190 case R_X86_64_TPOFF32
:
3191 BFD_ASSERT (! info
->shared
);
3192 relocation
= tpoff (info
, relocation
);
3199 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3200 because such sections are not SEC_ALLOC and thus ld.so will
3201 not process them. */
3202 if (unresolved_reloc
3203 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3205 (*_bfd_error_handler
)
3206 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3209 (long) rel
->r_offset
,
3211 h
->root
.root
.string
);
3213 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3214 contents
, rel
->r_offset
,
3215 relocation
, rel
->r_addend
);
3217 if (r
!= bfd_reloc_ok
)
3222 name
= h
->root
.root
.string
;
3225 name
= bfd_elf_string_from_elf_section (input_bfd
,
3226 symtab_hdr
->sh_link
,
3231 name
= bfd_section_name (input_bfd
, sec
);
3234 if (r
== bfd_reloc_overflow
)
3236 if (! ((*info
->callbacks
->reloc_overflow
)
3237 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3238 (bfd_vma
) 0, input_bfd
, input_section
,
3244 (*_bfd_error_handler
)
3245 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3246 input_bfd
, input_section
,
3247 (long) rel
->r_offset
, name
, (int) r
);
3256 /* Finish up dynamic symbol handling. We set the contents of various
3257 dynamic sections here. */
3260 elf64_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3261 struct bfd_link_info
*info
,
3262 struct elf_link_hash_entry
*h
,
3263 Elf_Internal_Sym
*sym
)
3265 struct elf64_x86_64_link_hash_table
*htab
;
3267 htab
= elf64_x86_64_hash_table (info
);
3269 if (h
->plt
.offset
!= (bfd_vma
) -1)
3273 Elf_Internal_Rela rela
;
3276 /* This symbol has an entry in the procedure linkage table. Set
3278 if (h
->dynindx
== -1
3279 || htab
->splt
== NULL
3280 || htab
->sgotplt
== NULL
3281 || htab
->srelplt
== NULL
)
3284 /* Get the index in the procedure linkage table which
3285 corresponds to this symbol. This is the index of this symbol
3286 in all the symbols for which we are making plt entries. The
3287 first entry in the procedure linkage table is reserved. */
3288 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3290 /* Get the offset into the .got table of the entry that
3291 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3292 bytes. The first three are reserved for the dynamic linker. */
3293 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3295 /* Fill in the entry in the procedure linkage table. */
3296 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf64_x86_64_plt_entry
,
3299 /* Insert the relocation positions of the plt section. The magic
3300 numbers at the end of the statements are the positions of the
3301 relocations in the plt section. */
3302 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3303 instruction uses 6 bytes, subtract this value. */
3304 bfd_put_32 (output_bfd
,
3305 (htab
->sgotplt
->output_section
->vma
3306 + htab
->sgotplt
->output_offset
3308 - htab
->splt
->output_section
->vma
3309 - htab
->splt
->output_offset
3312 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3313 /* Put relocation index. */
3314 bfd_put_32 (output_bfd
, plt_index
,
3315 htab
->splt
->contents
+ h
->plt
.offset
+ 7);
3316 /* Put offset for jmp .PLT0. */
3317 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3318 htab
->splt
->contents
+ h
->plt
.offset
+ 12);
3320 /* Fill in the entry in the global offset table, initially this
3321 points to the pushq instruction in the PLT which is at offset 6. */
3322 bfd_put_64 (output_bfd
, (htab
->splt
->output_section
->vma
3323 + htab
->splt
->output_offset
3324 + h
->plt
.offset
+ 6),
3325 htab
->sgotplt
->contents
+ got_offset
);
3327 /* Fill in the entry in the .rela.plt section. */
3328 rela
.r_offset
= (htab
->sgotplt
->output_section
->vma
3329 + htab
->sgotplt
->output_offset
3331 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_JUMP_SLOT
);
3333 loc
= htab
->srelplt
->contents
+ plt_index
* sizeof (Elf64_External_Rela
);
3334 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3336 if (!h
->def_regular
)
3338 /* Mark the symbol as undefined, rather than as defined in
3339 the .plt section. Leave the value if there were any
3340 relocations where pointer equality matters (this is a clue
3341 for the dynamic linker, to make function pointer
3342 comparisons work between an application and shared
3343 library), otherwise set it to zero. If a function is only
3344 called from a binary, there is no need to slow down
3345 shared libraries because of that. */
3346 sym
->st_shndx
= SHN_UNDEF
;
3347 if (!h
->pointer_equality_needed
)
3352 if (h
->got
.offset
!= (bfd_vma
) -1
3353 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h
)->tls_type
)
3354 && elf64_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
3356 Elf_Internal_Rela rela
;
3359 /* This symbol has an entry in the global offset table. Set it
3361 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
3364 rela
.r_offset
= (htab
->sgot
->output_section
->vma
3365 + htab
->sgot
->output_offset
3366 + (h
->got
.offset
&~ (bfd_vma
) 1));
3368 /* If this is a static link, or it is a -Bsymbolic link and the
3369 symbol is defined locally or was forced to be local because
3370 of a version file, we just want to emit a RELATIVE reloc.
3371 The entry in the global offset table will already have been
3372 initialized in the relocate_section function. */
3374 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3376 if (!h
->def_regular
)
3378 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3379 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3380 rela
.r_addend
= (h
->root
.u
.def
.value
3381 + h
->root
.u
.def
.section
->output_section
->vma
3382 + h
->root
.u
.def
.section
->output_offset
);
3386 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3387 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
3388 htab
->sgot
->contents
+ h
->got
.offset
);
3389 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_GLOB_DAT
);
3393 loc
= htab
->srelgot
->contents
;
3394 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3395 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3400 Elf_Internal_Rela rela
;
3403 /* This symbol needs a copy reloc. Set it up. */
3405 if (h
->dynindx
== -1
3406 || (h
->root
.type
!= bfd_link_hash_defined
3407 && h
->root
.type
!= bfd_link_hash_defweak
)
3408 || htab
->srelbss
== NULL
)
3411 rela
.r_offset
= (h
->root
.u
.def
.value
3412 + h
->root
.u
.def
.section
->output_section
->vma
3413 + h
->root
.u
.def
.section
->output_offset
);
3414 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_COPY
);
3416 loc
= htab
->srelbss
->contents
;
3417 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3418 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3421 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3422 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3423 || h
== htab
->elf
.hgot
)
3424 sym
->st_shndx
= SHN_ABS
;
3429 /* Used to decide how to sort relocs in an optimal manner for the
3430 dynamic linker, before writing them out. */
3432 static enum elf_reloc_type_class
3433 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
3435 switch ((int) ELF64_R_TYPE (rela
->r_info
))
3437 case R_X86_64_RELATIVE
:
3438 return reloc_class_relative
;
3439 case R_X86_64_JUMP_SLOT
:
3440 return reloc_class_plt
;
3442 return reloc_class_copy
;
3444 return reloc_class_normal
;
3448 /* Finish up the dynamic sections. */
3451 elf64_x86_64_finish_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
3453 struct elf64_x86_64_link_hash_table
*htab
;
3457 htab
= elf64_x86_64_hash_table (info
);
3458 dynobj
= htab
->elf
.dynobj
;
3459 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3461 if (htab
->elf
.dynamic_sections_created
)
3463 Elf64_External_Dyn
*dyncon
, *dynconend
;
3465 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
3468 dyncon
= (Elf64_External_Dyn
*) sdyn
->contents
;
3469 dynconend
= (Elf64_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3470 for (; dyncon
< dynconend
; dyncon
++)
3472 Elf_Internal_Dyn dyn
;
3475 bfd_elf64_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3484 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3488 dyn
.d_un
.d_ptr
= htab
->srelplt
->output_section
->vma
;
3492 s
= htab
->srelplt
->output_section
;
3493 dyn
.d_un
.d_val
= s
->size
;
3497 /* The procedure linkage table relocs (DT_JMPREL) should
3498 not be included in the overall relocs (DT_RELA).
3499 Therefore, we override the DT_RELASZ entry here to
3500 make it not include the JMPREL relocs. Since the
3501 linker script arranges for .rela.plt to follow all
3502 other relocation sections, we don't have to worry
3503 about changing the DT_RELA entry. */
3504 if (htab
->srelplt
!= NULL
)
3506 s
= htab
->srelplt
->output_section
;
3507 dyn
.d_un
.d_val
-= s
->size
;
3511 case DT_TLSDESC_PLT
:
3513 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
3514 + htab
->tlsdesc_plt
;
3517 case DT_TLSDESC_GOT
:
3519 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
3520 + htab
->tlsdesc_got
;
3524 bfd_elf64_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3527 /* Fill in the special first entry in the procedure linkage table. */
3528 if (htab
->splt
&& htab
->splt
->size
> 0)
3530 /* Fill in the first entry in the procedure linkage table. */
3531 memcpy (htab
->splt
->contents
, elf64_x86_64_plt0_entry
,
3533 /* Add offset for pushq GOT+8(%rip), since the instruction
3534 uses 6 bytes subtract this value. */
3535 bfd_put_32 (output_bfd
,
3536 (htab
->sgotplt
->output_section
->vma
3537 + htab
->sgotplt
->output_offset
3539 - htab
->splt
->output_section
->vma
3540 - htab
->splt
->output_offset
3542 htab
->splt
->contents
+ 2);
3543 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
3544 the end of the instruction. */
3545 bfd_put_32 (output_bfd
,
3546 (htab
->sgotplt
->output_section
->vma
3547 + htab
->sgotplt
->output_offset
3549 - htab
->splt
->output_section
->vma
3550 - htab
->splt
->output_offset
3552 htab
->splt
->contents
+ 8);
3554 elf_section_data (htab
->splt
->output_section
)->this_hdr
.sh_entsize
=
3557 if (htab
->tlsdesc_plt
)
3559 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
3560 htab
->sgot
->contents
+ htab
->tlsdesc_got
);
3562 memcpy (htab
->splt
->contents
+ htab
->tlsdesc_plt
,
3563 elf64_x86_64_plt0_entry
,
3566 /* Add offset for pushq GOT+8(%rip), since the
3567 instruction uses 6 bytes subtract this value. */
3568 bfd_put_32 (output_bfd
,
3569 (htab
->sgotplt
->output_section
->vma
3570 + htab
->sgotplt
->output_offset
3572 - htab
->splt
->output_section
->vma
3573 - htab
->splt
->output_offset
3576 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 2);
3577 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
3578 htab->tlsdesc_got. The 12 is the offset to the end of
3580 bfd_put_32 (output_bfd
,
3581 (htab
->sgot
->output_section
->vma
3582 + htab
->sgot
->output_offset
3584 - htab
->splt
->output_section
->vma
3585 - htab
->splt
->output_offset
3588 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 8);
3595 /* Fill in the first three entries in the global offset table. */
3596 if (htab
->sgotplt
->size
> 0)
3598 /* Set the first entry in the global offset table to the address of
3599 the dynamic section. */
3601 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
);
3603 bfd_put_64 (output_bfd
,
3604 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
3605 htab
->sgotplt
->contents
);
3606 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
3607 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
);
3608 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
3611 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
=
3615 if (htab
->sgot
&& htab
->sgot
->size
> 0)
3616 elf_section_data (htab
->sgot
->output_section
)->this_hdr
.sh_entsize
3622 /* Return address for Ith PLT stub in section PLT, for relocation REL
3623 or (bfd_vma) -1 if it should not be included. */
3626 elf64_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
3627 const arelent
*rel ATTRIBUTE_UNUSED
)
3629 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
3632 /* Handle an x86-64 specific section when reading an object file. This
3633 is called when elfcode.h finds a section with an unknown type. */
3636 elf64_x86_64_section_from_shdr (bfd
*abfd
,
3637 Elf_Internal_Shdr
*hdr
,
3641 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
3644 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
3650 /* Hook called by the linker routine which adds symbols from an object
3651 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
3655 elf64_x86_64_add_symbol_hook (bfd
*abfd
,
3656 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3657 Elf_Internal_Sym
*sym
,
3658 const char **namep ATTRIBUTE_UNUSED
,
3659 flagword
*flagsp ATTRIBUTE_UNUSED
,
3660 asection
**secp
, bfd_vma
*valp
)
3664 switch (sym
->st_shndx
)
3666 case SHN_X86_64_LCOMMON
:
3667 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
3670 lcomm
= bfd_make_section_with_flags (abfd
,
3674 | SEC_LINKER_CREATED
));
3677 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
3680 *valp
= sym
->st_size
;
3687 /* Given a BFD section, try to locate the corresponding ELF section
3691 elf64_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
3692 asection
*sec
, int *index
)
3694 if (sec
== &_bfd_elf_large_com_section
)
3696 *index
= SHN_X86_64_LCOMMON
;
3702 /* Process a symbol. */
3705 elf64_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
3708 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
3710 switch (elfsym
->internal_elf_sym
.st_shndx
)
3712 case SHN_X86_64_LCOMMON
:
3713 asym
->section
= &_bfd_elf_large_com_section
;
3714 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
3715 /* Common symbol doesn't set BSF_GLOBAL. */
3716 asym
->flags
&= ~BSF_GLOBAL
;
3722 elf64_x86_64_common_definition (Elf_Internal_Sym
*sym
)
3724 return (sym
->st_shndx
== SHN_COMMON
3725 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
3729 elf64_x86_64_common_section_index (asection
*sec
)
3731 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
3734 return SHN_X86_64_LCOMMON
;
3738 elf64_x86_64_common_section (asection
*sec
)
3740 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
3741 return bfd_com_section_ptr
;
3743 return &_bfd_elf_large_com_section
;
3747 elf64_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3748 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
3749 struct elf_link_hash_entry
*h
,
3750 Elf_Internal_Sym
*sym
,
3752 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
3753 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
3754 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
3755 bfd_boolean
*override ATTRIBUTE_UNUSED
,
3756 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
3757 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
3758 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
3759 bfd_boolean
*newdyn
,
3760 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
3761 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
3762 bfd
*abfd ATTRIBUTE_UNUSED
,
3764 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
3765 bfd_boolean
*olddyn
,
3766 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
3767 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
3771 /* A normal common symbol and a large common symbol result in a
3772 normal common symbol. We turn the large common symbol into a
3775 && h
->root
.type
== bfd_link_hash_common
3777 && bfd_is_com_section (*sec
)
3780 if (sym
->st_shndx
== SHN_COMMON
3781 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
3783 h
->root
.u
.c
.p
->section
3784 = bfd_make_section_old_way (oldbfd
, "COMMON");
3785 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
3787 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
3788 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
3789 *psec
= *sec
= bfd_com_section_ptr
;
3796 elf64_x86_64_additional_program_headers (bfd
*abfd
,
3797 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
3802 /* Check to see if we need a large readonly segment. */
3803 s
= bfd_get_section_by_name (abfd
, ".lrodata");
3804 if (s
&& (s
->flags
& SEC_LOAD
))
3807 /* Check to see if we need a large data segment. Since .lbss sections
3808 is placed right after the .bss section, there should be no need for
3809 a large data segment just because of .lbss. */
3810 s
= bfd_get_section_by_name (abfd
, ".ldata");
3811 if (s
&& (s
->flags
& SEC_LOAD
))
3817 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
3820 elf64_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
3822 if (h
->plt
.offset
!= (bfd_vma
) -1
3824 && !h
->pointer_equality_needed
)
3827 return _bfd_elf_hash_symbol (h
);
3830 static const struct bfd_elf_special_section
3831 elf64_x86_64_special_sections
[]=
3833 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3834 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
3835 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
3836 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3837 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3838 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
3839 { NULL
, 0, 0, 0, 0 }
3842 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
3843 #define TARGET_LITTLE_NAME "elf64-x86-64"
3844 #define ELF_ARCH bfd_arch_i386
3845 #define ELF_MACHINE_CODE EM_X86_64
3846 #define ELF_MAXPAGESIZE 0x200000
3847 #define ELF_MINPAGESIZE 0x1000
3848 #define ELF_COMMONPAGESIZE 0x1000
3850 #define elf_backend_can_gc_sections 1
3851 #define elf_backend_can_refcount 1
3852 #define elf_backend_want_got_plt 1
3853 #define elf_backend_plt_readonly 1
3854 #define elf_backend_want_plt_sym 0
3855 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
3856 #define elf_backend_rela_normal 1
3858 #define elf_info_to_howto elf64_x86_64_info_to_howto
3860 #define bfd_elf64_bfd_link_hash_table_create \
3861 elf64_x86_64_link_hash_table_create
3862 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
3863 #define bfd_elf64_bfd_reloc_name_lookup \
3864 elf64_x86_64_reloc_name_lookup
3866 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
3867 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
3868 #define elf_backend_check_relocs elf64_x86_64_check_relocs
3869 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
3870 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
3871 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
3872 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
3873 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
3874 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
3875 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
3876 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
3877 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
3878 #define elf_backend_relocate_section elf64_x86_64_relocate_section
3879 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
3880 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
3881 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3882 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
3883 #define elf_backend_object_p elf64_x86_64_elf_object_p
3884 #define bfd_elf64_mkobject elf64_x86_64_mkobject
3886 #define elf_backend_section_from_shdr \
3887 elf64_x86_64_section_from_shdr
3889 #define elf_backend_section_from_bfd_section \
3890 elf64_x86_64_elf_section_from_bfd_section
3891 #define elf_backend_add_symbol_hook \
3892 elf64_x86_64_add_symbol_hook
3893 #define elf_backend_symbol_processing \
3894 elf64_x86_64_symbol_processing
3895 #define elf_backend_common_section_index \
3896 elf64_x86_64_common_section_index
3897 #define elf_backend_common_section \
3898 elf64_x86_64_common_section
3899 #define elf_backend_common_definition \
3900 elf64_x86_64_common_definition
3901 #define elf_backend_merge_symbol \
3902 elf64_x86_64_merge_symbol
3903 #define elf_backend_special_sections \
3904 elf64_x86_64_special_sections
3905 #define elf_backend_additional_program_headers \
3906 elf64_x86_64_additional_program_headers
3907 #define elf_backend_hash_symbol \
3908 elf64_x86_64_hash_symbol
3910 #include "elf64-target.h"
3912 /* FreeBSD support. */
3914 #undef TARGET_LITTLE_SYM
3915 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
3916 #undef TARGET_LITTLE_NAME
3917 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
3920 #define ELF_OSABI ELFOSABI_FREEBSD
3922 #undef elf_backend_post_process_headers
3923 #define elf_backend_post_process_headers _bfd_elf_set_osabi
3926 #define elf64_bed elf64_x86_64_fbsd_bed
3928 #include "elf64-target.h"