1 /* X86-64 specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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 2 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, MA 02110-1301, USA. */
28 #include "elf/x86-64.h"
30 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
31 #define MINUS_ONE (~ (bfd_vma) 0)
33 /* The relocation "howto" table. Order of fields:
34 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
35 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
36 static reloc_howto_type x86_64_elf_howto_table
[] =
38 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
39 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
41 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
42 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
44 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
45 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
47 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
48 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
50 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
51 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
53 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
54 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
56 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
57 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
59 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
60 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
62 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
63 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
65 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
66 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
68 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
69 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
71 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
72 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
74 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
75 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
76 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
77 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
78 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
79 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
80 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
81 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
82 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
85 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
86 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
88 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
89 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
91 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
92 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
94 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
95 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
97 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
98 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
100 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
101 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
103 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
104 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
106 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
107 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
109 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
110 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
111 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
112 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
113 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
114 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
115 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
116 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
118 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
119 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
121 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
122 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
123 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
124 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
125 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
127 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
128 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
132 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
133 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
134 "R_X86_64_GOTPC32_TLSDESC",
135 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
136 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
137 complain_overflow_dont
, bfd_elf_generic_reloc
,
138 "R_X86_64_TLSDESC_CALL",
140 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
141 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
143 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
145 /* We have a gap in the reloc numbers here.
146 R_X86_64_standard counts the number up to this point, and
147 R_X86_64_vt_offset is the value to subtract from a reloc type of
148 R_X86_64_GNU_VT* to form an index into this table. */
149 #define R_X86_64_standard (R_X86_64_TLSDESC + 1)
150 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
152 /* GNU extension to record C++ vtable hierarchy. */
153 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
154 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
156 /* GNU extension to record C++ vtable member usage. */
157 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
158 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
162 /* Map BFD relocs to the x86_64 elf relocs. */
165 bfd_reloc_code_real_type bfd_reloc_val
;
166 unsigned char elf_reloc_val
;
169 static const struct elf_reloc_map x86_64_reloc_map
[] =
171 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
172 { BFD_RELOC_64
, R_X86_64_64
, },
173 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
174 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
175 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
176 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
177 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
178 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
179 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
180 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
181 { BFD_RELOC_32
, R_X86_64_32
, },
182 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
183 { BFD_RELOC_16
, R_X86_64_16
, },
184 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
185 { BFD_RELOC_8
, R_X86_64_8
, },
186 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
187 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
188 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
189 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
190 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
191 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
192 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
193 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
194 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
195 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
196 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
197 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
198 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
199 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
200 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
201 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
202 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
203 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
204 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
205 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
206 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
207 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
210 static reloc_howto_type
*
211 elf64_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
215 if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
216 || r_type
>= (unsigned int) R_X86_64_max
)
218 if (r_type
>= (unsigned int) R_X86_64_standard
)
220 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
222 r_type
= R_X86_64_NONE
;
227 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
228 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
229 return &x86_64_elf_howto_table
[i
];
232 /* Given a BFD reloc type, return a HOWTO structure. */
233 static reloc_howto_type
*
234 elf64_x86_64_reloc_type_lookup (bfd
*abfd
,
235 bfd_reloc_code_real_type code
)
239 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
242 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
243 return elf64_x86_64_rtype_to_howto (abfd
,
244 x86_64_reloc_map
[i
].elf_reloc_val
);
249 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
252 elf64_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
253 Elf_Internal_Rela
*dst
)
257 r_type
= ELF64_R_TYPE (dst
->r_info
);
258 cache_ptr
->howto
= elf64_x86_64_rtype_to_howto (abfd
, r_type
);
259 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
262 /* Support for core dump NOTE sections. */
264 elf64_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
269 switch (note
->descsz
)
274 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
276 elf_tdata (abfd
)->core_signal
277 = bfd_get_16 (abfd
, note
->descdata
+ 12);
280 elf_tdata (abfd
)->core_pid
281 = bfd_get_32 (abfd
, note
->descdata
+ 32);
290 /* Make a ".reg/999" section. */
291 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
292 size
, note
->descpos
+ offset
);
296 elf64_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
298 switch (note
->descsz
)
303 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
304 elf_tdata (abfd
)->core_program
305 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
306 elf_tdata (abfd
)->core_command
307 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
310 /* Note that for some reason, a spurious space is tacked
311 onto the end of the args in some (at least one anyway)
312 implementations, so strip it off if it exists. */
315 char *command
= elf_tdata (abfd
)->core_command
;
316 int n
= strlen (command
);
318 if (0 < n
&& command
[n
- 1] == ' ')
319 command
[n
- 1] = '\0';
325 /* Functions for the x86-64 ELF linker. */
327 /* The name of the dynamic interpreter. This is put in the .interp
330 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
332 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
333 copying dynamic variables from a shared lib into an app's dynbss
334 section, and instead use a dynamic relocation to point into the
336 #define ELIMINATE_COPY_RELOCS 1
338 /* The size in bytes of an entry in the global offset table. */
340 #define GOT_ENTRY_SIZE 8
342 /* The size in bytes of an entry in the procedure linkage table. */
344 #define PLT_ENTRY_SIZE 16
346 /* The first entry in a procedure linkage table looks like this. See the
347 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
349 static const bfd_byte elf64_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
351 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
352 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
353 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
356 /* Subsequent entries in a procedure linkage table look like this. */
358 static const bfd_byte elf64_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
360 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
361 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
362 0x68, /* pushq immediate */
363 0, 0, 0, 0, /* replaced with index into relocation table. */
364 0xe9, /* jmp relative */
365 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
368 /* The x86-64 linker needs to keep track of the number of relocs that
369 it decides to copy as dynamic relocs in check_relocs for each symbol.
370 This is so that it can later discard them if they are found to be
371 unnecessary. We store the information in a field extending the
372 regular ELF linker hash table. */
374 struct elf64_x86_64_dyn_relocs
377 struct elf64_x86_64_dyn_relocs
*next
;
379 /* The input section of the reloc. */
382 /* Total number of relocs copied for the input section. */
385 /* Number of pc-relative relocs copied for the input section. */
386 bfd_size_type pc_count
;
389 /* x86-64 ELF linker hash entry. */
391 struct elf64_x86_64_link_hash_entry
393 struct elf_link_hash_entry elf
;
395 /* Track dynamic relocs copied for this symbol. */
396 struct elf64_x86_64_dyn_relocs
*dyn_relocs
;
398 #define GOT_UNKNOWN 0
402 #define GOT_TLS_GDESC 4
403 #define GOT_TLS_GD_BOTH_P(type) \
404 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
405 #define GOT_TLS_GD_P(type) \
406 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
407 #define GOT_TLS_GDESC_P(type) \
408 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
409 #define GOT_TLS_GD_ANY_P(type) \
410 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
411 unsigned char tls_type
;
413 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
414 starting at the end of the jump table. */
418 #define elf64_x86_64_hash_entry(ent) \
419 ((struct elf64_x86_64_link_hash_entry *)(ent))
421 struct elf64_x86_64_obj_tdata
423 struct elf_obj_tdata root
;
425 /* tls_type for each local got entry. */
426 char *local_got_tls_type
;
428 /* GOTPLT entries for TLS descriptors. */
429 bfd_vma
*local_tlsdesc_gotent
;
432 #define elf64_x86_64_tdata(abfd) \
433 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
435 #define elf64_x86_64_local_got_tls_type(abfd) \
436 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
438 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
439 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
441 /* x86-64 ELF linker hash table. */
443 struct elf64_x86_64_link_hash_table
445 struct elf_link_hash_table elf
;
447 /* Short-cuts to get to dynamic linker sections. */
456 /* The offset into splt of the PLT entry for the TLS descriptor
457 resolver. Special values are 0, if not necessary (or not found
458 to be necessary yet), and -1 if needed but not determined
461 /* The offset into sgot of the GOT entry used by the PLT entry
466 bfd_signed_vma refcount
;
470 /* The amount of space used by the jump slots in the GOT. */
471 bfd_vma sgotplt_jump_table_size
;
473 /* Small local sym to section mapping cache. */
474 struct sym_sec_cache sym_sec
;
477 /* Get the x86-64 ELF linker hash table from a link_info structure. */
479 #define elf64_x86_64_hash_table(p) \
480 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
482 #define elf64_x86_64_compute_jump_table_size(htab) \
483 ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE)
485 /* Create an entry in an x86-64 ELF linker hash table. */
487 static struct bfd_hash_entry
*
488 link_hash_newfunc (struct bfd_hash_entry
*entry
, struct bfd_hash_table
*table
,
491 /* Allocate the structure if it has not already been allocated by a
495 entry
= bfd_hash_allocate (table
,
496 sizeof (struct elf64_x86_64_link_hash_entry
));
501 /* Call the allocation method of the superclass. */
502 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
505 struct elf64_x86_64_link_hash_entry
*eh
;
507 eh
= (struct elf64_x86_64_link_hash_entry
*) entry
;
508 eh
->dyn_relocs
= NULL
;
509 eh
->tls_type
= GOT_UNKNOWN
;
510 eh
->tlsdesc_got
= (bfd_vma
) -1;
516 /* Create an X86-64 ELF linker hash table. */
518 static struct bfd_link_hash_table
*
519 elf64_x86_64_link_hash_table_create (bfd
*abfd
)
521 struct elf64_x86_64_link_hash_table
*ret
;
522 bfd_size_type amt
= sizeof (struct elf64_x86_64_link_hash_table
);
524 ret
= (struct elf64_x86_64_link_hash_table
*) bfd_malloc (amt
);
528 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
, link_hash_newfunc
,
529 sizeof (struct elf64_x86_64_link_hash_entry
)))
542 ret
->sym_sec
.abfd
= NULL
;
543 ret
->tlsdesc_plt
= 0;
544 ret
->tlsdesc_got
= 0;
545 ret
->tls_ld_got
.refcount
= 0;
546 ret
->sgotplt_jump_table_size
= 0;
548 return &ret
->elf
.root
;
551 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
552 shortcuts to them in our hash table. */
555 create_got_section (bfd
*dynobj
, struct bfd_link_info
*info
)
557 struct elf64_x86_64_link_hash_table
*htab
;
559 if (! _bfd_elf_create_got_section (dynobj
, info
))
562 htab
= elf64_x86_64_hash_table (info
);
563 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
564 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
565 if (!htab
->sgot
|| !htab
->sgotplt
)
568 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rela.got",
569 (SEC_ALLOC
| SEC_LOAD
574 if (htab
->srelgot
== NULL
575 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 3))
580 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
581 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
585 elf64_x86_64_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
587 struct elf64_x86_64_link_hash_table
*htab
;
589 htab
= elf64_x86_64_hash_table (info
);
590 if (!htab
->sgot
&& !create_got_section (dynobj
, info
))
593 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
596 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
597 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
598 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
600 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
602 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
603 || (!info
->shared
&& !htab
->srelbss
))
609 /* Copy the extra info we tack onto an elf_link_hash_entry. */
612 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
613 struct elf_link_hash_entry
*dir
,
614 struct elf_link_hash_entry
*ind
)
616 struct elf64_x86_64_link_hash_entry
*edir
, *eind
;
618 edir
= (struct elf64_x86_64_link_hash_entry
*) dir
;
619 eind
= (struct elf64_x86_64_link_hash_entry
*) ind
;
621 if (eind
->dyn_relocs
!= NULL
)
623 if (edir
->dyn_relocs
!= NULL
)
625 struct elf64_x86_64_dyn_relocs
**pp
;
626 struct elf64_x86_64_dyn_relocs
*p
;
628 /* Add reloc counts against the indirect sym to the direct sym
629 list. Merge any entries against the same section. */
630 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
632 struct elf64_x86_64_dyn_relocs
*q
;
634 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
635 if (q
->sec
== p
->sec
)
637 q
->pc_count
+= p
->pc_count
;
638 q
->count
+= p
->count
;
645 *pp
= edir
->dyn_relocs
;
648 edir
->dyn_relocs
= eind
->dyn_relocs
;
649 eind
->dyn_relocs
= NULL
;
652 if (ind
->root
.type
== bfd_link_hash_indirect
653 && dir
->got
.refcount
<= 0)
655 edir
->tls_type
= eind
->tls_type
;
656 eind
->tls_type
= GOT_UNKNOWN
;
659 if (ELIMINATE_COPY_RELOCS
660 && ind
->root
.type
!= bfd_link_hash_indirect
661 && dir
->dynamic_adjusted
)
663 /* If called to transfer flags for a weakdef during processing
664 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
665 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
666 dir
->ref_dynamic
|= ind
->ref_dynamic
;
667 dir
->ref_regular
|= ind
->ref_regular
;
668 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
669 dir
->needs_plt
|= ind
->needs_plt
;
670 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
673 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
677 elf64_x86_64_mkobject (bfd
*abfd
)
679 if (abfd
->tdata
.any
== NULL
)
681 bfd_size_type amt
= sizeof (struct elf64_x86_64_obj_tdata
);
682 abfd
->tdata
.any
= bfd_zalloc (abfd
, amt
);
683 if (abfd
->tdata
.any
== NULL
)
686 return bfd_elf_mkobject (abfd
);
690 elf64_x86_64_elf_object_p (bfd
*abfd
)
692 /* Set the right machine number for an x86-64 elf64 file. */
693 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
698 elf64_x86_64_tls_transition (struct bfd_link_info
*info
, int r_type
, int is_local
)
706 case R_X86_64_GOTPC32_TLSDESC
:
707 case R_X86_64_TLSDESC_CALL
:
708 case R_X86_64_GOTTPOFF
:
710 return R_X86_64_TPOFF32
;
711 return R_X86_64_GOTTPOFF
;
713 return R_X86_64_TPOFF32
;
719 /* Look through the relocs for a section during the first phase, and
720 calculate needed space in the global offset table, procedure
721 linkage table, and dynamic reloc sections. */
724 elf64_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
*sec
,
725 const Elf_Internal_Rela
*relocs
)
727 struct elf64_x86_64_link_hash_table
*htab
;
728 Elf_Internal_Shdr
*symtab_hdr
;
729 struct elf_link_hash_entry
**sym_hashes
;
730 const Elf_Internal_Rela
*rel
;
731 const Elf_Internal_Rela
*rel_end
;
734 if (info
->relocatable
)
737 htab
= elf64_x86_64_hash_table (info
);
738 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
739 sym_hashes
= elf_sym_hashes (abfd
);
743 rel_end
= relocs
+ sec
->reloc_count
;
744 for (rel
= relocs
; rel
< rel_end
; rel
++)
747 unsigned long r_symndx
;
748 struct elf_link_hash_entry
*h
;
750 r_symndx
= ELF64_R_SYM (rel
->r_info
);
751 r_type
= ELF64_R_TYPE (rel
->r_info
);
753 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
755 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
760 if (r_symndx
< symtab_hdr
->sh_info
)
764 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
765 while (h
->root
.type
== bfd_link_hash_indirect
766 || h
->root
.type
== bfd_link_hash_warning
)
767 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
770 r_type
= elf64_x86_64_tls_transition (info
, r_type
, h
== NULL
);
774 htab
->tls_ld_got
.refcount
+= 1;
777 case R_X86_64_TPOFF32
:
780 (*_bfd_error_handler
)
781 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
783 x86_64_elf_howto_table
[r_type
].name
,
784 (h
) ? h
->root
.root
.string
: "a local symbol");
785 bfd_set_error (bfd_error_bad_value
);
790 case R_X86_64_GOTTPOFF
:
792 info
->flags
|= DF_STATIC_TLS
;
796 case R_X86_64_GOTPCREL
:
799 case R_X86_64_GOTPCREL64
:
800 case R_X86_64_GOTPLT64
:
801 case R_X86_64_GOTPC32_TLSDESC
:
802 case R_X86_64_TLSDESC_CALL
:
803 /* This symbol requires a global offset table entry. */
805 int tls_type
, old_tls_type
;
809 default: tls_type
= GOT_NORMAL
; break;
810 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
811 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
812 case R_X86_64_GOTPC32_TLSDESC
:
813 case R_X86_64_TLSDESC_CALL
:
814 tls_type
= GOT_TLS_GDESC
; break;
819 if (r_type
== R_X86_64_GOTPLT64
)
821 /* This relocation indicates that we also need
822 a PLT entry, as this is a function. We don't need
823 a PLT entry for local symbols. */
825 h
->plt
.refcount
+= 1;
827 h
->got
.refcount
+= 1;
828 old_tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
832 bfd_signed_vma
*local_got_refcounts
;
834 /* This is a global offset table entry for a local symbol. */
835 local_got_refcounts
= elf_local_got_refcounts (abfd
);
836 if (local_got_refcounts
== NULL
)
840 size
= symtab_hdr
->sh_info
;
841 size
*= sizeof (bfd_signed_vma
)
842 + sizeof (bfd_vma
) + sizeof (char);
843 local_got_refcounts
= ((bfd_signed_vma
*)
844 bfd_zalloc (abfd
, size
));
845 if (local_got_refcounts
== NULL
)
847 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
848 elf64_x86_64_local_tlsdesc_gotent (abfd
)
849 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
850 elf64_x86_64_local_got_tls_type (abfd
)
851 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
853 local_got_refcounts
[r_symndx
] += 1;
855 = elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
];
858 /* If a TLS symbol is accessed using IE at least once,
859 there is no point to use dynamic model for it. */
860 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
861 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
862 || tls_type
!= GOT_TLS_IE
))
864 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
865 tls_type
= old_tls_type
;
866 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
867 && GOT_TLS_GD_ANY_P (tls_type
))
868 tls_type
|= old_tls_type
;
871 (*_bfd_error_handler
)
872 (_("%B: %s' accessed both as normal and thread local symbol"),
873 abfd
, h
? h
->root
.root
.string
: "<local>");
878 if (old_tls_type
!= tls_type
)
881 elf64_x86_64_hash_entry (h
)->tls_type
= tls_type
;
883 elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
888 case R_X86_64_GOTOFF64
:
889 case R_X86_64_GOTPC32
:
890 case R_X86_64_GOTPC64
:
892 if (htab
->sgot
== NULL
)
894 if (htab
->elf
.dynobj
== NULL
)
895 htab
->elf
.dynobj
= abfd
;
896 if (!create_got_section (htab
->elf
.dynobj
, info
))
902 /* This symbol requires a procedure linkage table entry. We
903 actually build the entry in adjust_dynamic_symbol,
904 because this might be a case of linking PIC code which is
905 never referenced by a dynamic object, in which case we
906 don't need to generate a procedure linkage table entry
909 /* If this is a local symbol, we resolve it directly without
910 creating a procedure linkage table entry. */
915 h
->plt
.refcount
+= 1;
918 case R_X86_64_PLTOFF64
:
919 /* This tries to form the 'address' of a function relative
920 to GOT. For global symbols we need a PLT entry. */
924 h
->plt
.refcount
+= 1;
932 /* Let's help debug shared library creation. These relocs
933 cannot be used in shared libs. Don't error out for
934 sections we don't care about, such as debug sections or
935 non-constant sections. */
937 && (sec
->flags
& SEC_ALLOC
) != 0
938 && (sec
->flags
& SEC_READONLY
) != 0)
940 (*_bfd_error_handler
)
941 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
943 x86_64_elf_howto_table
[r_type
].name
,
944 (h
) ? h
->root
.root
.string
: "a local symbol");
945 bfd_set_error (bfd_error_bad_value
);
955 if (h
!= NULL
&& !info
->shared
)
957 /* If this reloc is in a read-only section, we might
958 need a copy reloc. We can't check reliably at this
959 stage whether the section is read-only, as input
960 sections have not yet been mapped to output sections.
961 Tentatively set the flag for now, and correct in
962 adjust_dynamic_symbol. */
965 /* We may need a .plt entry if the function this reloc
966 refers to is in a shared lib. */
967 h
->plt
.refcount
+= 1;
968 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
969 h
->pointer_equality_needed
= 1;
972 /* If we are creating a shared library, and this is a reloc
973 against a global symbol, or a non PC relative reloc
974 against a local symbol, then we need to copy the reloc
975 into the shared library. However, if we are linking with
976 -Bsymbolic, we do not need to copy a reloc against a
977 global symbol which is defined in an object we are
978 including in the link (i.e., DEF_REGULAR is set). At
979 this point we have not seen all the input files, so it is
980 possible that DEF_REGULAR is not set now but will be set
981 later (it is never cleared). In case of a weak definition,
982 DEF_REGULAR may be cleared later by a strong definition in
983 a shared library. We account for that possibility below by
984 storing information in the relocs_copied field of the hash
985 table entry. A similar situation occurs when creating
986 shared libraries and symbol visibility changes render the
989 If on the other hand, we are creating an executable, we
990 may need to keep relocations for symbols satisfied by a
991 dynamic library if we manage to avoid copy relocs for the
994 && (sec
->flags
& SEC_ALLOC
) != 0
995 && (((r_type
!= R_X86_64_PC8
)
996 && (r_type
!= R_X86_64_PC16
)
997 && (r_type
!= R_X86_64_PC32
)
998 && (r_type
!= R_X86_64_PC64
))
1000 && (! SYMBOLIC_BIND (info
, h
)
1001 || h
->root
.type
== bfd_link_hash_defweak
1002 || !h
->def_regular
))))
1003 || (ELIMINATE_COPY_RELOCS
1005 && (sec
->flags
& SEC_ALLOC
) != 0
1007 && (h
->root
.type
== bfd_link_hash_defweak
1008 || !h
->def_regular
)))
1010 struct elf64_x86_64_dyn_relocs
*p
;
1011 struct elf64_x86_64_dyn_relocs
**head
;
1013 /* We must copy these reloc types into the output file.
1014 Create a reloc section in dynobj and make room for
1021 name
= (bfd_elf_string_from_elf_section
1023 elf_elfheader (abfd
)->e_shstrndx
,
1024 elf_section_data (sec
)->rel_hdr
.sh_name
));
1028 if (! CONST_STRNEQ (name
, ".rela")
1029 || strcmp (bfd_get_section_name (abfd
, sec
),
1032 (*_bfd_error_handler
)
1033 (_("%B: bad relocation section name `%s\'"),
1037 if (htab
->elf
.dynobj
== NULL
)
1038 htab
->elf
.dynobj
= abfd
;
1040 dynobj
= htab
->elf
.dynobj
;
1042 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1047 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
1048 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1049 if ((sec
->flags
& SEC_ALLOC
) != 0)
1050 flags
|= SEC_ALLOC
| SEC_LOAD
;
1051 sreloc
= bfd_make_section_with_flags (dynobj
,
1055 || ! bfd_set_section_alignment (dynobj
, sreloc
, 3))
1058 elf_section_data (sec
)->sreloc
= sreloc
;
1061 /* If this is a global symbol, we count the number of
1062 relocations we need for this symbol. */
1065 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1070 /* Track dynamic relocs needed for local syms too.
1071 We really need local syms available to do this
1075 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1080 /* Beware of type punned pointers vs strict aliasing
1082 vpp
= &(elf_section_data (s
)->local_dynrel
);
1083 head
= (struct elf64_x86_64_dyn_relocs
**)vpp
;
1087 if (p
== NULL
|| p
->sec
!= sec
)
1089 bfd_size_type amt
= sizeof *p
;
1090 p
= ((struct elf64_x86_64_dyn_relocs
*)
1091 bfd_alloc (htab
->elf
.dynobj
, amt
));
1102 if (r_type
== R_X86_64_PC8
1103 || r_type
== R_X86_64_PC16
1104 || r_type
== R_X86_64_PC32
1105 || r_type
== R_X86_64_PC64
)
1110 /* This relocation describes the C++ object vtable hierarchy.
1111 Reconstruct it for later use during GC. */
1112 case R_X86_64_GNU_VTINHERIT
:
1113 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1117 /* This relocation describes which C++ vtable entries are actually
1118 used. Record for later use during GC. */
1119 case R_X86_64_GNU_VTENTRY
:
1120 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1132 /* Return the section that should be marked against GC for a given
1136 elf64_x86_64_gc_mark_hook (asection
*sec
,
1137 struct bfd_link_info
*info
,
1138 Elf_Internal_Rela
*rel
,
1139 struct elf_link_hash_entry
*h
,
1140 Elf_Internal_Sym
*sym
)
1143 switch (ELF64_R_TYPE (rel
->r_info
))
1145 case R_X86_64_GNU_VTINHERIT
:
1146 case R_X86_64_GNU_VTENTRY
:
1150 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1153 /* Update the got entry reference counts for the section being removed. */
1156 elf64_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1157 asection
*sec
, const Elf_Internal_Rela
*relocs
)
1159 Elf_Internal_Shdr
*symtab_hdr
;
1160 struct elf_link_hash_entry
**sym_hashes
;
1161 bfd_signed_vma
*local_got_refcounts
;
1162 const Elf_Internal_Rela
*rel
, *relend
;
1164 elf_section_data (sec
)->local_dynrel
= NULL
;
1166 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1167 sym_hashes
= elf_sym_hashes (abfd
);
1168 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1170 relend
= relocs
+ sec
->reloc_count
;
1171 for (rel
= relocs
; rel
< relend
; rel
++)
1173 unsigned long r_symndx
;
1174 unsigned int r_type
;
1175 struct elf_link_hash_entry
*h
= NULL
;
1177 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1178 if (r_symndx
>= symtab_hdr
->sh_info
)
1180 struct elf64_x86_64_link_hash_entry
*eh
;
1181 struct elf64_x86_64_dyn_relocs
**pp
;
1182 struct elf64_x86_64_dyn_relocs
*p
;
1184 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1185 while (h
->root
.type
== bfd_link_hash_indirect
1186 || h
->root
.type
== bfd_link_hash_warning
)
1187 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1188 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1190 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1193 /* Everything must go for SEC. */
1199 r_type
= ELF64_R_TYPE (rel
->r_info
);
1200 r_type
= elf64_x86_64_tls_transition (info
, r_type
, h
!= NULL
);
1203 case R_X86_64_TLSLD
:
1204 if (elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
> 0)
1205 elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
-= 1;
1208 case R_X86_64_TLSGD
:
1209 case R_X86_64_GOTPC32_TLSDESC
:
1210 case R_X86_64_TLSDESC_CALL
:
1211 case R_X86_64_GOTTPOFF
:
1212 case R_X86_64_GOT32
:
1213 case R_X86_64_GOTPCREL
:
1214 case R_X86_64_GOT64
:
1215 case R_X86_64_GOTPCREL64
:
1216 case R_X86_64_GOTPLT64
:
1219 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1220 h
->plt
.refcount
-= 1;
1221 if (h
->got
.refcount
> 0)
1222 h
->got
.refcount
-= 1;
1224 else if (local_got_refcounts
!= NULL
)
1226 if (local_got_refcounts
[r_symndx
] > 0)
1227 local_got_refcounts
[r_symndx
] -= 1;
1244 case R_X86_64_PLT32
:
1245 case R_X86_64_PLTOFF64
:
1248 if (h
->plt
.refcount
> 0)
1249 h
->plt
.refcount
-= 1;
1261 /* Adjust a symbol defined by a dynamic object and referenced by a
1262 regular object. The current definition is in some section of the
1263 dynamic object, but we're not including those sections. We have to
1264 change the definition to something the rest of the link can
1268 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1269 struct elf_link_hash_entry
*h
)
1271 struct elf64_x86_64_link_hash_table
*htab
;
1273 unsigned int power_of_two
;
1275 /* If this is a function, put it in the procedure linkage table. We
1276 will fill in the contents of the procedure linkage table later,
1277 when we know the address of the .got section. */
1278 if (h
->type
== STT_FUNC
1281 if (h
->plt
.refcount
<= 0
1282 || SYMBOL_CALLS_LOCAL (info
, h
)
1283 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1284 && h
->root
.type
== bfd_link_hash_undefweak
))
1286 /* This case can occur if we saw a PLT32 reloc in an input
1287 file, but the symbol was never referred to by a dynamic
1288 object, or if all references were garbage collected. In
1289 such a case, we don't actually need to build a procedure
1290 linkage table, and we can just do a PC32 reloc instead. */
1291 h
->plt
.offset
= (bfd_vma
) -1;
1298 /* It's possible that we incorrectly decided a .plt reloc was
1299 needed for an R_X86_64_PC32 reloc to a non-function sym in
1300 check_relocs. We can't decide accurately between function and
1301 non-function syms in check-relocs; Objects loaded later in
1302 the link may change h->type. So fix it now. */
1303 h
->plt
.offset
= (bfd_vma
) -1;
1305 /* If this is a weak symbol, and there is a real definition, the
1306 processor independent code will have arranged for us to see the
1307 real definition first, and we can just use the same value. */
1308 if (h
->u
.weakdef
!= NULL
)
1310 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1311 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1312 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1313 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1314 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1315 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1319 /* This is a reference to a symbol defined by a dynamic object which
1320 is not a function. */
1322 /* If we are creating a shared library, we must presume that the
1323 only references to the symbol are via the global offset table.
1324 For such cases we need not do anything here; the relocations will
1325 be handled correctly by relocate_section. */
1329 /* If there are no references to this symbol that do not use the
1330 GOT, we don't need to generate a copy reloc. */
1331 if (!h
->non_got_ref
)
1334 /* If -z nocopyreloc was given, we won't generate them either. */
1335 if (info
->nocopyreloc
)
1341 if (ELIMINATE_COPY_RELOCS
)
1343 struct elf64_x86_64_link_hash_entry
* eh
;
1344 struct elf64_x86_64_dyn_relocs
*p
;
1346 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1347 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1349 s
= p
->sec
->output_section
;
1350 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1354 /* If we didn't find any dynamic relocs in read-only sections, then
1355 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1365 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1366 h
->root
.root
.string
);
1370 /* We must allocate the symbol in our .dynbss section, which will
1371 become part of the .bss section of the executable. There will be
1372 an entry for this symbol in the .dynsym section. The dynamic
1373 object will contain position independent code, so all references
1374 from the dynamic object to this symbol will go through the global
1375 offset table. The dynamic linker will use the .dynsym entry to
1376 determine the address it must put in the global offset table, so
1377 both the dynamic object and the regular object will refer to the
1378 same memory location for the variable. */
1380 htab
= elf64_x86_64_hash_table (info
);
1382 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1383 to copy the initial value out of the dynamic object and into the
1384 runtime process image. */
1385 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1387 htab
->srelbss
->size
+= sizeof (Elf64_External_Rela
);
1391 /* We need to figure out the alignment required for this symbol. I
1392 have no idea how ELF linkers handle this. 16-bytes is the size
1393 of the largest type that requires hard alignment -- long double. */
1394 /* FIXME: This is VERY ugly. Should be fixed for all architectures using
1396 power_of_two
= bfd_log2 (h
->size
);
1397 if (power_of_two
> 4)
1400 /* Apply the required alignment. */
1402 s
->size
= BFD_ALIGN (s
->size
, (bfd_size_type
) (1 << power_of_two
));
1403 if (power_of_two
> bfd_get_section_alignment (htab
->elf
.dynobj
, s
))
1405 if (! bfd_set_section_alignment (htab
->elf
.dynobj
, s
, power_of_two
))
1409 /* Define the symbol as being at this point in the section. */
1410 h
->root
.u
.def
.section
= s
;
1411 h
->root
.u
.def
.value
= s
->size
;
1413 /* Increment the section size to make room for the symbol. */
1419 /* Allocate space in .plt, .got and associated reloc sections for
1423 allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1425 struct bfd_link_info
*info
;
1426 struct elf64_x86_64_link_hash_table
*htab
;
1427 struct elf64_x86_64_link_hash_entry
*eh
;
1428 struct elf64_x86_64_dyn_relocs
*p
;
1430 if (h
->root
.type
== bfd_link_hash_indirect
)
1433 if (h
->root
.type
== bfd_link_hash_warning
)
1434 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1436 info
= (struct bfd_link_info
*) inf
;
1437 htab
= elf64_x86_64_hash_table (info
);
1439 if (htab
->elf
.dynamic_sections_created
1440 && h
->plt
.refcount
> 0)
1442 /* Make sure this symbol is output as a dynamic symbol.
1443 Undefined weak syms won't yet be marked as dynamic. */
1444 if (h
->dynindx
== -1
1445 && !h
->forced_local
)
1447 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1452 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
1454 asection
*s
= htab
->splt
;
1456 /* If this is the first .plt entry, make room for the special
1459 s
->size
+= PLT_ENTRY_SIZE
;
1461 h
->plt
.offset
= s
->size
;
1463 /* If this symbol is not defined in a regular file, and we are
1464 not generating a shared library, then set the symbol to this
1465 location in the .plt. This is required to make function
1466 pointers compare as equal between the normal executable and
1467 the shared library. */
1471 h
->root
.u
.def
.section
= s
;
1472 h
->root
.u
.def
.value
= h
->plt
.offset
;
1475 /* Make room for this entry. */
1476 s
->size
+= PLT_ENTRY_SIZE
;
1478 /* We also need to make an entry in the .got.plt section, which
1479 will be placed in the .got section by the linker script. */
1480 htab
->sgotplt
->size
+= GOT_ENTRY_SIZE
;
1482 /* We also need to make an entry in the .rela.plt section. */
1483 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
1484 htab
->srelplt
->reloc_count
++;
1488 h
->plt
.offset
= (bfd_vma
) -1;
1494 h
->plt
.offset
= (bfd_vma
) -1;
1498 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1499 eh
->tlsdesc_got
= (bfd_vma
) -1;
1501 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1502 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1503 if (h
->got
.refcount
> 0
1506 && elf64_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
1507 h
->got
.offset
= (bfd_vma
) -1;
1508 else if (h
->got
.refcount
> 0)
1512 int tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1514 /* Make sure this symbol is output as a dynamic symbol.
1515 Undefined weak syms won't yet be marked as dynamic. */
1516 if (h
->dynindx
== -1
1517 && !h
->forced_local
)
1519 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1523 if (GOT_TLS_GDESC_P (tls_type
))
1525 eh
->tlsdesc_got
= htab
->sgotplt
->size
1526 - elf64_x86_64_compute_jump_table_size (htab
);
1527 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
1528 h
->got
.offset
= (bfd_vma
) -2;
1530 if (! GOT_TLS_GDESC_P (tls_type
)
1531 || GOT_TLS_GD_P (tls_type
))
1534 h
->got
.offset
= s
->size
;
1535 s
->size
+= GOT_ENTRY_SIZE
;
1536 if (GOT_TLS_GD_P (tls_type
))
1537 s
->size
+= GOT_ENTRY_SIZE
;
1539 dyn
= htab
->elf
.dynamic_sections_created
;
1540 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1542 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1543 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
1544 || tls_type
== GOT_TLS_IE
)
1545 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
1546 else if (GOT_TLS_GD_P (tls_type
))
1547 htab
->srelgot
->size
+= 2 * sizeof (Elf64_External_Rela
);
1548 else if (! GOT_TLS_GDESC_P (tls_type
)
1549 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1550 || h
->root
.type
!= bfd_link_hash_undefweak
)
1552 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
1553 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
1554 if (GOT_TLS_GDESC_P (tls_type
))
1556 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
1557 htab
->tlsdesc_plt
= (bfd_vma
) -1;
1561 h
->got
.offset
= (bfd_vma
) -1;
1563 if (eh
->dyn_relocs
== NULL
)
1566 /* In the shared -Bsymbolic case, discard space allocated for
1567 dynamic pc-relative relocs against symbols which turn out to be
1568 defined in regular objects. For the normal shared case, discard
1569 space for pc-relative relocs that have become local due to symbol
1570 visibility changes. */
1574 /* Relocs that use pc_count are those that appear on a call
1575 insn, or certain REL relocs that can generated via assembly.
1576 We want calls to protected symbols to resolve directly to the
1577 function rather than going via the plt. If people want
1578 function pointer comparisons to work as expected then they
1579 should avoid writing weird assembly. */
1580 if (SYMBOL_CALLS_LOCAL (info
, h
))
1582 struct elf64_x86_64_dyn_relocs
**pp
;
1584 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1586 p
->count
-= p
->pc_count
;
1595 /* Also discard relocs on undefined weak syms with non-default
1597 if (eh
->dyn_relocs
!= NULL
1598 && h
->root
.type
== bfd_link_hash_undefweak
)
1600 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
1601 eh
->dyn_relocs
= NULL
;
1603 /* Make sure undefined weak symbols are output as a dynamic
1605 else if (h
->dynindx
== -1
1606 && !h
->forced_local
)
1608 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1613 else if (ELIMINATE_COPY_RELOCS
)
1615 /* For the non-shared case, discard space for relocs against
1616 symbols which turn out to need copy relocs or are not
1622 || (htab
->elf
.dynamic_sections_created
1623 && (h
->root
.type
== bfd_link_hash_undefweak
1624 || h
->root
.type
== bfd_link_hash_undefined
))))
1626 /* Make sure this symbol is output as a dynamic symbol.
1627 Undefined weak syms won't yet be marked as dynamic. */
1628 if (h
->dynindx
== -1
1629 && !h
->forced_local
)
1631 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1635 /* If that succeeded, we know we'll be keeping all the
1637 if (h
->dynindx
!= -1)
1641 eh
->dyn_relocs
= NULL
;
1646 /* Finally, allocate space. */
1647 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1649 asection
*sreloc
= elf_section_data (p
->sec
)->sreloc
;
1650 sreloc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
1656 /* Find any dynamic relocs that apply to read-only sections. */
1659 readonly_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1661 struct elf64_x86_64_link_hash_entry
*eh
;
1662 struct elf64_x86_64_dyn_relocs
*p
;
1664 if (h
->root
.type
== bfd_link_hash_warning
)
1665 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1667 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1668 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1670 asection
*s
= p
->sec
->output_section
;
1672 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1674 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
1676 info
->flags
|= DF_TEXTREL
;
1678 /* Not an error, just cut short the traversal. */
1685 /* Set the sizes of the dynamic sections. */
1688 elf64_x86_64_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1689 struct bfd_link_info
*info
)
1691 struct elf64_x86_64_link_hash_table
*htab
;
1697 htab
= elf64_x86_64_hash_table (info
);
1698 dynobj
= htab
->elf
.dynobj
;
1702 if (htab
->elf
.dynamic_sections_created
)
1704 /* Set the contents of the .interp section to the interpreter. */
1705 if (info
->executable
)
1707 s
= bfd_get_section_by_name (dynobj
, ".interp");
1710 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1711 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1715 /* Set up .got offsets for local syms, and space for local dynamic
1717 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
1719 bfd_signed_vma
*local_got
;
1720 bfd_signed_vma
*end_local_got
;
1721 char *local_tls_type
;
1722 bfd_vma
*local_tlsdesc_gotent
;
1723 bfd_size_type locsymcount
;
1724 Elf_Internal_Shdr
*symtab_hdr
;
1727 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
1730 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
1732 struct elf64_x86_64_dyn_relocs
*p
;
1734 for (p
= (struct elf64_x86_64_dyn_relocs
*)
1735 (elf_section_data (s
)->local_dynrel
);
1739 if (!bfd_is_abs_section (p
->sec
)
1740 && bfd_is_abs_section (p
->sec
->output_section
))
1742 /* Input section has been discarded, either because
1743 it is a copy of a linkonce section or due to
1744 linker script /DISCARD/, so we'll be discarding
1747 else if (p
->count
!= 0)
1749 srel
= elf_section_data (p
->sec
)->sreloc
;
1750 srel
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
1751 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
1752 info
->flags
|= DF_TEXTREL
;
1758 local_got
= elf_local_got_refcounts (ibfd
);
1762 symtab_hdr
= &elf_tdata (ibfd
)->symtab_hdr
;
1763 locsymcount
= symtab_hdr
->sh_info
;
1764 end_local_got
= local_got
+ locsymcount
;
1765 local_tls_type
= elf64_x86_64_local_got_tls_type (ibfd
);
1766 local_tlsdesc_gotent
= elf64_x86_64_local_tlsdesc_gotent (ibfd
);
1768 srel
= htab
->srelgot
;
1769 for (; local_got
< end_local_got
;
1770 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
1772 *local_tlsdesc_gotent
= (bfd_vma
) -1;
1775 if (GOT_TLS_GDESC_P (*local_tls_type
))
1777 *local_tlsdesc_gotent
= htab
->sgotplt
->size
1778 - elf64_x86_64_compute_jump_table_size (htab
);
1779 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
1780 *local_got
= (bfd_vma
) -2;
1782 if (! GOT_TLS_GDESC_P (*local_tls_type
)
1783 || GOT_TLS_GD_P (*local_tls_type
))
1785 *local_got
= s
->size
;
1786 s
->size
+= GOT_ENTRY_SIZE
;
1787 if (GOT_TLS_GD_P (*local_tls_type
))
1788 s
->size
+= GOT_ENTRY_SIZE
;
1791 || GOT_TLS_GD_ANY_P (*local_tls_type
)
1792 || *local_tls_type
== GOT_TLS_IE
)
1794 if (GOT_TLS_GDESC_P (*local_tls_type
))
1796 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
1797 htab
->tlsdesc_plt
= (bfd_vma
) -1;
1799 if (! GOT_TLS_GDESC_P (*local_tls_type
)
1800 || GOT_TLS_GD_P (*local_tls_type
))
1801 srel
->size
+= sizeof (Elf64_External_Rela
);
1805 *local_got
= (bfd_vma
) -1;
1809 if (htab
->tls_ld_got
.refcount
> 0)
1811 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
1813 htab
->tls_ld_got
.offset
= htab
->sgot
->size
;
1814 htab
->sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
1815 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
1818 htab
->tls_ld_got
.offset
= -1;
1820 /* Allocate global sym .plt and .got entries, and space for global
1821 sym dynamic relocs. */
1822 elf_link_hash_traverse (&htab
->elf
, allocate_dynrelocs
, (PTR
) info
);
1824 /* For every jump slot reserved in the sgotplt, reloc_count is
1825 incremented. However, when we reserve space for TLS descriptors,
1826 it's not incremented, so in order to compute the space reserved
1827 for them, it suffices to multiply the reloc count by the jump
1830 htab
->sgotplt_jump_table_size
1831 = elf64_x86_64_compute_jump_table_size (htab
);
1833 if (htab
->tlsdesc_plt
)
1835 /* If we're not using lazy TLS relocations, don't generate the
1836 PLT and GOT entries they require. */
1837 if ((info
->flags
& DF_BIND_NOW
))
1838 htab
->tlsdesc_plt
= 0;
1841 htab
->tlsdesc_got
= htab
->sgot
->size
;
1842 htab
->sgot
->size
+= GOT_ENTRY_SIZE
;
1843 /* Reserve room for the initial entry.
1844 FIXME: we could probably do away with it in this case. */
1845 if (htab
->splt
->size
== 0)
1846 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
1847 htab
->tlsdesc_plt
= htab
->splt
->size
;
1848 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
1852 /* We now have determined the sizes of the various dynamic sections.
1853 Allocate memory for them. */
1855 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1857 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1862 || s
== htab
->sgotplt
1863 || s
== htab
->sdynbss
)
1865 /* Strip this section if we don't need it; see the
1868 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
1870 if (s
->size
!= 0 && s
!= htab
->srelplt
)
1873 /* We use the reloc_count field as a counter if we need
1874 to copy relocs into the output file. */
1875 if (s
!= htab
->srelplt
)
1880 /* It's not one of our sections, so don't allocate space. */
1886 /* If we don't need this section, strip it from the
1887 output file. This is mostly to handle .rela.bss and
1888 .rela.plt. We must create both sections in
1889 create_dynamic_sections, because they must be created
1890 before the linker maps input sections to output
1891 sections. The linker does that before
1892 adjust_dynamic_symbol is called, and it is that
1893 function which decides whether anything needs to go
1894 into these sections. */
1896 s
->flags
|= SEC_EXCLUDE
;
1900 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
1903 /* Allocate memory for the section contents. We use bfd_zalloc
1904 here in case unused entries are not reclaimed before the
1905 section's contents are written out. This should not happen,
1906 but this way if it does, we get a R_X86_64_NONE reloc instead
1908 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
1909 if (s
->contents
== NULL
)
1913 if (htab
->elf
.dynamic_sections_created
)
1915 /* Add some entries to the .dynamic section. We fill in the
1916 values later, in elf64_x86_64_finish_dynamic_sections, but we
1917 must add the entries now so that we get the correct size for
1918 the .dynamic section. The DT_DEBUG entry is filled in by the
1919 dynamic linker and used by the debugger. */
1920 #define add_dynamic_entry(TAG, VAL) \
1921 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1923 if (info
->executable
)
1925 if (!add_dynamic_entry (DT_DEBUG
, 0))
1929 if (htab
->splt
->size
!= 0)
1931 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1932 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
1933 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
1934 || !add_dynamic_entry (DT_JMPREL
, 0))
1937 if (htab
->tlsdesc_plt
1938 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
1939 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
1945 if (!add_dynamic_entry (DT_RELA
, 0)
1946 || !add_dynamic_entry (DT_RELASZ
, 0)
1947 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf64_External_Rela
)))
1950 /* If any dynamic relocs apply to a read-only section,
1951 then we need a DT_TEXTREL entry. */
1952 if ((info
->flags
& DF_TEXTREL
) == 0)
1953 elf_link_hash_traverse (&htab
->elf
, readonly_dynrelocs
,
1956 if ((info
->flags
& DF_TEXTREL
) != 0)
1958 if (!add_dynamic_entry (DT_TEXTREL
, 0))
1963 #undef add_dynamic_entry
1969 elf64_x86_64_always_size_sections (bfd
*output_bfd
,
1970 struct bfd_link_info
*info
)
1972 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
1976 struct elf_link_hash_entry
*tlsbase
;
1978 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
1979 "_TLS_MODULE_BASE_",
1980 FALSE
, FALSE
, FALSE
);
1982 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
1984 struct bfd_link_hash_entry
*bh
= NULL
;
1985 const struct elf_backend_data
*bed
1986 = get_elf_backend_data (output_bfd
);
1988 if (!(_bfd_generic_link_add_one_symbol
1989 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
1990 tls_sec
, 0, NULL
, FALSE
,
1991 bed
->collect
, &bh
)))
1993 tlsbase
= (struct elf_link_hash_entry
*)bh
;
1994 tlsbase
->def_regular
= 1;
1995 tlsbase
->other
= STV_HIDDEN
;
1996 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2003 /* Return the base VMA address which should be subtracted from real addresses
2004 when resolving @dtpoff relocation.
2005 This is PT_TLS segment p_vaddr. */
2008 dtpoff_base (struct bfd_link_info
*info
)
2010 /* If tls_sec is NULL, we should have signalled an error already. */
2011 if (elf_hash_table (info
)->tls_sec
== NULL
)
2013 return elf_hash_table (info
)->tls_sec
->vma
;
2016 /* Return the relocation value for @tpoff relocation
2017 if STT_TLS virtual address is ADDRESS. */
2020 tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2022 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2024 /* If tls_segment is NULL, we should have signalled an error already. */
2025 if (htab
->tls_sec
== NULL
)
2027 return address
- htab
->tls_size
- htab
->tls_sec
->vma
;
2030 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2034 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2036 /* Opcode Instruction
2039 0x0f 0x8x conditional jump */
2041 && (contents
[offset
- 1] == 0xe8
2042 || contents
[offset
- 1] == 0xe9))
2044 && contents
[offset
- 2] == 0x0f
2045 && (contents
[offset
- 1] & 0xf0) == 0x80));
2048 /* Relocate an x86_64 ELF section. */
2051 elf64_x86_64_relocate_section (bfd
*output_bfd
, struct bfd_link_info
*info
,
2052 bfd
*input_bfd
, asection
*input_section
,
2053 bfd_byte
*contents
, Elf_Internal_Rela
*relocs
,
2054 Elf_Internal_Sym
*local_syms
,
2055 asection
**local_sections
)
2057 struct elf64_x86_64_link_hash_table
*htab
;
2058 Elf_Internal_Shdr
*symtab_hdr
;
2059 struct elf_link_hash_entry
**sym_hashes
;
2060 bfd_vma
*local_got_offsets
;
2061 bfd_vma
*local_tlsdesc_gotents
;
2062 Elf_Internal_Rela
*rel
;
2063 Elf_Internal_Rela
*relend
;
2065 htab
= elf64_x86_64_hash_table (info
);
2066 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2067 sym_hashes
= elf_sym_hashes (input_bfd
);
2068 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2069 local_tlsdesc_gotents
= elf64_x86_64_local_tlsdesc_gotent (input_bfd
);
2072 relend
= relocs
+ input_section
->reloc_count
;
2073 for (; rel
< relend
; rel
++)
2075 unsigned int r_type
;
2076 reloc_howto_type
*howto
;
2077 unsigned long r_symndx
;
2078 struct elf_link_hash_entry
*h
;
2079 Elf_Internal_Sym
*sym
;
2081 bfd_vma off
, offplt
;
2083 bfd_boolean unresolved_reloc
;
2084 bfd_reloc_status_type r
;
2087 r_type
= ELF64_R_TYPE (rel
->r_info
);
2088 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2089 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2092 if (r_type
>= R_X86_64_max
)
2094 bfd_set_error (bfd_error_bad_value
);
2098 howto
= x86_64_elf_howto_table
+ r_type
;
2099 r_symndx
= ELF64_R_SYM (rel
->r_info
);
2103 unresolved_reloc
= FALSE
;
2104 if (r_symndx
< symtab_hdr
->sh_info
)
2106 sym
= local_syms
+ r_symndx
;
2107 sec
= local_sections
[r_symndx
];
2109 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2115 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2116 r_symndx
, symtab_hdr
, sym_hashes
,
2118 unresolved_reloc
, warned
);
2121 if (sec
!= NULL
&& elf_discarded_section (sec
))
2123 /* For relocs against symbols from removed linkonce sections,
2124 or sections discarded by a linker script, we just want the
2125 section contents zeroed. Avoid any special processing. */
2126 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2132 if (info
->relocatable
)
2135 /* When generating a shared object, the relocations handled here are
2136 copied into the output file to be resolved at run time. */
2140 case R_X86_64_GOT32
:
2141 case R_X86_64_GOT64
:
2142 /* Relocation is to the entry for this symbol in the global
2144 case R_X86_64_GOTPCREL
:
2145 case R_X86_64_GOTPCREL64
:
2146 /* Use global offset table entry as symbol value. */
2147 case R_X86_64_GOTPLT64
:
2148 /* This is the same as GOT64 for relocation purposes, but
2149 indicates the existence of a PLT entry. The difficulty is,
2150 that we must calculate the GOT slot offset from the PLT
2151 offset, if this symbol got a PLT entry (it was global).
2152 Additionally if it's computed from the PLT entry, then that
2153 GOT offset is relative to .got.plt, not to .got. */
2154 base_got
= htab
->sgot
;
2156 if (htab
->sgot
== NULL
)
2163 off
= h
->got
.offset
;
2165 && h
->plt
.offset
!= (bfd_vma
)-1
2166 && off
== (bfd_vma
)-1)
2168 /* We can't use h->got.offset here to save
2169 state, or even just remember the offset, as
2170 finish_dynamic_symbol would use that as offset into
2172 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2173 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2174 base_got
= htab
->sgotplt
;
2177 dyn
= htab
->elf
.dynamic_sections_created
;
2179 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
2181 && SYMBOL_REFERENCES_LOCAL (info
, h
))
2182 || (ELF_ST_VISIBILITY (h
->other
)
2183 && h
->root
.type
== bfd_link_hash_undefweak
))
2185 /* This is actually a static link, or it is a -Bsymbolic
2186 link and the symbol is defined locally, or the symbol
2187 was forced to be local because of a version file. We
2188 must initialize this entry in the global offset table.
2189 Since the offset must always be a multiple of 8, we
2190 use the least significant bit to record whether we
2191 have initialized it already.
2193 When doing a dynamic link, we create a .rela.got
2194 relocation entry to initialize the value. This is
2195 done in the finish_dynamic_symbol routine. */
2200 bfd_put_64 (output_bfd
, relocation
,
2201 base_got
->contents
+ off
);
2202 /* Note that this is harmless for the GOTPLT64 case,
2203 as -1 | 1 still is -1. */
2208 unresolved_reloc
= FALSE
;
2212 if (local_got_offsets
== NULL
)
2215 off
= local_got_offsets
[r_symndx
];
2217 /* The offset must always be a multiple of 8. We use
2218 the least significant bit to record whether we have
2219 already generated the necessary reloc. */
2224 bfd_put_64 (output_bfd
, relocation
,
2225 base_got
->contents
+ off
);
2230 Elf_Internal_Rela outrel
;
2233 /* We need to generate a R_X86_64_RELATIVE reloc
2234 for the dynamic linker. */
2239 outrel
.r_offset
= (base_got
->output_section
->vma
2240 + base_got
->output_offset
2242 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
2243 outrel
.r_addend
= relocation
;
2245 loc
+= s
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2246 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2249 local_got_offsets
[r_symndx
] |= 1;
2253 if (off
>= (bfd_vma
) -2)
2256 relocation
= base_got
->output_section
->vma
2257 + base_got
->output_offset
+ off
;
2258 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
2259 relocation
-= htab
->sgotplt
->output_section
->vma
2260 - htab
->sgotplt
->output_offset
;
2264 case R_X86_64_GOTOFF64
:
2265 /* Relocation is relative to the start of the global offset
2268 /* Check to make sure it isn't a protected function symbol
2269 for shared library since it may not be local when used
2270 as function address. */
2274 && h
->type
== STT_FUNC
2275 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
2277 (*_bfd_error_handler
)
2278 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
2279 input_bfd
, h
->root
.root
.string
);
2280 bfd_set_error (bfd_error_bad_value
);
2284 /* Note that sgot is not involved in this
2285 calculation. We always want the start of .got.plt. If we
2286 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2287 permitted by the ABI, we might have to change this
2289 relocation
-= htab
->sgotplt
->output_section
->vma
2290 + htab
->sgotplt
->output_offset
;
2293 case R_X86_64_GOTPC32
:
2294 case R_X86_64_GOTPC64
:
2295 /* Use global offset table as symbol value. */
2296 relocation
= htab
->sgotplt
->output_section
->vma
2297 + htab
->sgotplt
->output_offset
;
2298 unresolved_reloc
= FALSE
;
2301 case R_X86_64_PLTOFF64
:
2302 /* Relocation is PLT entry relative to GOT. For local
2303 symbols it's the symbol itself relative to GOT. */
2305 /* See PLT32 handling. */
2306 && h
->plt
.offset
!= (bfd_vma
) -1
2307 && htab
->splt
!= NULL
)
2309 relocation
= (htab
->splt
->output_section
->vma
2310 + htab
->splt
->output_offset
2312 unresolved_reloc
= FALSE
;
2315 relocation
-= htab
->sgotplt
->output_section
->vma
2316 + htab
->sgotplt
->output_offset
;
2319 case R_X86_64_PLT32
:
2320 /* Relocation is to the entry for this symbol in the
2321 procedure linkage table. */
2323 /* Resolve a PLT32 reloc against a local symbol directly,
2324 without using the procedure linkage table. */
2328 if (h
->plt
.offset
== (bfd_vma
) -1
2329 || htab
->splt
== NULL
)
2331 /* We didn't make a PLT entry for this symbol. This
2332 happens when statically linking PIC code, or when
2333 using -Bsymbolic. */
2337 relocation
= (htab
->splt
->output_section
->vma
2338 + htab
->splt
->output_offset
2340 unresolved_reloc
= FALSE
;
2347 && !SYMBOL_REFERENCES_LOCAL (info
, h
)
2348 && (input_section
->flags
& SEC_ALLOC
) != 0
2349 && (input_section
->flags
& SEC_READONLY
) != 0
2351 || r_type
!= R_X86_64_PC32
2352 || h
->type
!= STT_FUNC
2353 || ELF_ST_VISIBILITY (h
->other
) != STV_PROTECTED
2354 || !is_32bit_relative_branch (contents
,
2358 && r_type
== R_X86_64_PC32
2359 && h
->type
== STT_FUNC
2360 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
2361 (*_bfd_error_handler
)
2362 (_("%B: relocation R_X86_64_PC32 against protected function `%s' can not be used when making a shared object"),
2363 input_bfd
, h
->root
.root
.string
);
2365 (*_bfd_error_handler
)
2366 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
2367 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2368 h
->root
.root
.string
);
2369 bfd_set_error (bfd_error_bad_value
);
2379 /* FIXME: The ABI says the linker should make sure the value is
2380 the same when it's zeroextended to 64 bit. */
2382 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2387 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2388 || h
->root
.type
!= bfd_link_hash_undefweak
)
2389 && ((r_type
!= R_X86_64_PC8
2390 && r_type
!= R_X86_64_PC16
2391 && r_type
!= R_X86_64_PC32
2392 && r_type
!= R_X86_64_PC64
)
2393 || !SYMBOL_CALLS_LOCAL (info
, h
)))
2394 || (ELIMINATE_COPY_RELOCS
2401 || h
->root
.type
== bfd_link_hash_undefweak
2402 || h
->root
.type
== bfd_link_hash_undefined
)))
2404 Elf_Internal_Rela outrel
;
2406 bfd_boolean skip
, relocate
;
2409 /* When generating a shared object, these relocations
2410 are copied into the output file to be resolved at run
2416 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2418 if (outrel
.r_offset
== (bfd_vma
) -1)
2420 else if (outrel
.r_offset
== (bfd_vma
) -2)
2421 skip
= TRUE
, relocate
= TRUE
;
2423 outrel
.r_offset
+= (input_section
->output_section
->vma
2424 + input_section
->output_offset
);
2427 memset (&outrel
, 0, sizeof outrel
);
2429 /* h->dynindx may be -1 if this symbol was marked to
2433 && (r_type
== R_X86_64_PC8
2434 || r_type
== R_X86_64_PC16
2435 || r_type
== R_X86_64_PC32
2436 || r_type
== R_X86_64_PC64
2438 || !SYMBOLIC_BIND (info
, h
)
2439 || !h
->def_regular
))
2441 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
2442 outrel
.r_addend
= rel
->r_addend
;
2446 /* This symbol is local, or marked to become local. */
2447 if (r_type
== R_X86_64_64
)
2450 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
2451 outrel
.r_addend
= relocation
+ rel
->r_addend
;
2457 if (bfd_is_abs_section (sec
))
2459 else if (sec
== NULL
|| sec
->owner
== NULL
)
2461 bfd_set_error (bfd_error_bad_value
);
2468 /* We are turning this relocation into one
2469 against a section symbol. It would be
2470 proper to subtract the symbol's value,
2471 osec->vma, from the emitted reloc addend,
2472 but ld.so expects buggy relocs. */
2473 osec
= sec
->output_section
;
2474 sindx
= elf_section_data (osec
)->dynindx
;
2477 asection
*oi
= htab
->elf
.text_index_section
;
2478 sindx
= elf_section_data (oi
)->dynindx
;
2480 BFD_ASSERT (sindx
!= 0);
2483 outrel
.r_info
= ELF64_R_INFO (sindx
, r_type
);
2484 outrel
.r_addend
= relocation
+ rel
->r_addend
;
2488 sreloc
= elf_section_data (input_section
)->sreloc
;
2492 loc
= sreloc
->contents
;
2493 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2494 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2496 /* If this reloc is against an external symbol, we do
2497 not want to fiddle with the addend. Otherwise, we
2498 need to include the symbol value so that it becomes
2499 an addend for the dynamic reloc. */
2506 case R_X86_64_TLSGD
:
2507 case R_X86_64_GOTPC32_TLSDESC
:
2508 case R_X86_64_TLSDESC_CALL
:
2509 case R_X86_64_GOTTPOFF
:
2510 r_type
= elf64_x86_64_tls_transition (info
, r_type
, h
== NULL
);
2511 tls_type
= GOT_UNKNOWN
;
2512 if (h
== NULL
&& local_got_offsets
)
2513 tls_type
= elf64_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
2516 tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
2517 if (!info
->shared
&& h
->dynindx
== -1 && tls_type
== GOT_TLS_IE
)
2518 r_type
= R_X86_64_TPOFF32
;
2520 if (r_type
== R_X86_64_TLSGD
2521 || r_type
== R_X86_64_GOTPC32_TLSDESC
2522 || r_type
== R_X86_64_TLSDESC_CALL
)
2524 if (tls_type
== GOT_TLS_IE
)
2525 r_type
= R_X86_64_GOTTPOFF
;
2528 if (r_type
== R_X86_64_TPOFF32
)
2530 BFD_ASSERT (! unresolved_reloc
);
2531 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
2534 static unsigned char tlsgd
[8]
2535 = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 };
2537 /* GD->LE transition.
2538 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
2539 .word 0x6666; rex64; call __tls_get_addr@plt
2542 leaq foo@tpoff(%rax), %rax */
2543 BFD_ASSERT (rel
->r_offset
>= 4);
2544 for (i
= 0; i
< 4; i
++)
2545 BFD_ASSERT (bfd_get_8 (input_bfd
,
2546 contents
+ rel
->r_offset
- 4 + i
)
2548 BFD_ASSERT (rel
->r_offset
+ 12 <= input_section
->size
);
2549 for (i
= 0; i
< 4; i
++)
2550 BFD_ASSERT (bfd_get_8 (input_bfd
,
2551 contents
+ rel
->r_offset
+ 4 + i
)
2553 BFD_ASSERT (rel
+ 1 < relend
);
2554 BFD_ASSERT (ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
);
2555 memcpy (contents
+ rel
->r_offset
- 4,
2556 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
2558 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2559 contents
+ rel
->r_offset
+ 8);
2560 /* Skip R_X86_64_PLT32. */
2564 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
2566 /* GDesc -> LE transition.
2567 It's originally something like:
2568 leaq x@tlsdesc(%rip), %rax
2573 Registers other than %rax may be set up here. */
2575 unsigned int val
, type
, type2
;
2578 /* First, make sure it's a leaq adding rip to a
2579 32-bit offset into any register, although it's
2580 probably almost always going to be rax. */
2581 roff
= rel
->r_offset
;
2582 BFD_ASSERT (roff
>= 3);
2583 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
2584 BFD_ASSERT ((type
& 0xfb) == 0x48);
2585 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
2586 BFD_ASSERT (type2
== 0x8d);
2587 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
2588 BFD_ASSERT ((val
& 0xc7) == 0x05);
2589 BFD_ASSERT (roff
+ 4 <= input_section
->size
);
2591 /* Now modify the instruction as appropriate. */
2592 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
2593 contents
+ roff
- 3);
2594 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
2595 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
2596 contents
+ roff
- 1);
2597 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2601 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
2603 /* GDesc -> LE transition.
2609 unsigned int val
, type
;
2612 /* First, make sure it's a call *(%rax). */
2613 roff
= rel
->r_offset
;
2614 BFD_ASSERT (roff
+ 2 <= input_section
->size
);
2615 type
= bfd_get_8 (input_bfd
, contents
+ roff
);
2616 BFD_ASSERT (type
== 0xff);
2617 val
= bfd_get_8 (input_bfd
, contents
+ roff
+ 1);
2618 BFD_ASSERT (val
== 0x10);
2620 /* Now modify the instruction as appropriate. Use
2621 xchg %ax,%ax instead of 2 nops. */
2622 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
2623 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
2628 unsigned int val
, type
, reg
;
2630 /* IE->LE transition:
2631 Originally it can be one of:
2632 movq foo@gottpoff(%rip), %reg
2633 addq foo@gottpoff(%rip), %reg
2636 leaq foo(%reg), %reg
2638 BFD_ASSERT (rel
->r_offset
>= 3);
2639 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 3);
2640 BFD_ASSERT (val
== 0x48 || val
== 0x4c);
2641 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
2642 BFD_ASSERT (type
== 0x8b || type
== 0x03);
2643 reg
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
2644 BFD_ASSERT ((reg
& 0xc7) == 5);
2646 BFD_ASSERT (rel
->r_offset
+ 4 <= input_section
->size
);
2651 bfd_put_8 (output_bfd
, 0x49,
2652 contents
+ rel
->r_offset
- 3);
2653 bfd_put_8 (output_bfd
, 0xc7,
2654 contents
+ rel
->r_offset
- 2);
2655 bfd_put_8 (output_bfd
, 0xc0 | reg
,
2656 contents
+ rel
->r_offset
- 1);
2660 /* addq -> addq - addressing with %rsp/%r12 is
2663 bfd_put_8 (output_bfd
, 0x49,
2664 contents
+ rel
->r_offset
- 3);
2665 bfd_put_8 (output_bfd
, 0x81,
2666 contents
+ rel
->r_offset
- 2);
2667 bfd_put_8 (output_bfd
, 0xc0 | reg
,
2668 contents
+ rel
->r_offset
- 1);
2674 bfd_put_8 (output_bfd
, 0x4d,
2675 contents
+ rel
->r_offset
- 3);
2676 bfd_put_8 (output_bfd
, 0x8d,
2677 contents
+ rel
->r_offset
- 2);
2678 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
2679 contents
+ rel
->r_offset
- 1);
2681 bfd_put_32 (output_bfd
, tpoff (info
, relocation
),
2682 contents
+ rel
->r_offset
);
2687 if (htab
->sgot
== NULL
)
2692 off
= h
->got
.offset
;
2693 offplt
= elf64_x86_64_hash_entry (h
)->tlsdesc_got
;
2697 if (local_got_offsets
== NULL
)
2700 off
= local_got_offsets
[r_symndx
];
2701 offplt
= local_tlsdesc_gotents
[r_symndx
];
2708 Elf_Internal_Rela outrel
;
2713 if (htab
->srelgot
== NULL
)
2716 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
2718 if (GOT_TLS_GDESC_P (tls_type
))
2720 outrel
.r_info
= ELF64_R_INFO (indx
, R_X86_64_TLSDESC
);
2721 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
2722 + 2 * GOT_ENTRY_SIZE
<= htab
->sgotplt
->size
);
2723 outrel
.r_offset
= (htab
->sgotplt
->output_section
->vma
2724 + htab
->sgotplt
->output_offset
2726 + htab
->sgotplt_jump_table_size
);
2727 sreloc
= htab
->srelplt
;
2728 loc
= sreloc
->contents
;
2729 loc
+= sreloc
->reloc_count
++
2730 * sizeof (Elf64_External_Rela
);
2731 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
2732 <= sreloc
->contents
+ sreloc
->size
);
2734 outrel
.r_addend
= relocation
- dtpoff_base (info
);
2736 outrel
.r_addend
= 0;
2737 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2740 sreloc
= htab
->srelgot
;
2742 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2743 + htab
->sgot
->output_offset
+ off
);
2745 if (GOT_TLS_GD_P (tls_type
))
2746 dr_type
= R_X86_64_DTPMOD64
;
2747 else if (GOT_TLS_GDESC_P (tls_type
))
2750 dr_type
= R_X86_64_TPOFF64
;
2752 bfd_put_64 (output_bfd
, 0, htab
->sgot
->contents
+ off
);
2753 outrel
.r_addend
= 0;
2754 if ((dr_type
== R_X86_64_TPOFF64
2755 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
2756 outrel
.r_addend
= relocation
- dtpoff_base (info
);
2757 outrel
.r_info
= ELF64_R_INFO (indx
, dr_type
);
2759 loc
= sreloc
->contents
;
2760 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2761 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
2762 <= sreloc
->contents
+ sreloc
->size
);
2763 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2765 if (GOT_TLS_GD_P (tls_type
))
2769 BFD_ASSERT (! unresolved_reloc
);
2770 bfd_put_64 (output_bfd
,
2771 relocation
- dtpoff_base (info
),
2772 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
2776 bfd_put_64 (output_bfd
, 0,
2777 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
2778 outrel
.r_info
= ELF64_R_INFO (indx
,
2780 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
2781 sreloc
->reloc_count
++;
2782 loc
+= sizeof (Elf64_External_Rela
);
2783 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
2784 <= sreloc
->contents
+ sreloc
->size
);
2785 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2793 local_got_offsets
[r_symndx
] |= 1;
2796 if (off
>= (bfd_vma
) -2
2797 && ! GOT_TLS_GDESC_P (tls_type
))
2799 if (r_type
== ELF64_R_TYPE (rel
->r_info
))
2801 if (r_type
== R_X86_64_GOTPC32_TLSDESC
2802 || r_type
== R_X86_64_TLSDESC_CALL
)
2803 relocation
= htab
->sgotplt
->output_section
->vma
2804 + htab
->sgotplt
->output_offset
2805 + offplt
+ htab
->sgotplt_jump_table_size
;
2807 relocation
= htab
->sgot
->output_section
->vma
2808 + htab
->sgot
->output_offset
+ off
;
2809 unresolved_reloc
= FALSE
;
2811 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
2814 static unsigned char tlsgd
[8]
2815 = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 };
2817 /* GD->IE transition.
2818 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
2819 .word 0x6666; rex64; call __tls_get_addr@plt
2822 addq foo@gottpoff(%rip), %rax */
2823 BFD_ASSERT (rel
->r_offset
>= 4);
2824 for (i
= 0; i
< 4; i
++)
2825 BFD_ASSERT (bfd_get_8 (input_bfd
,
2826 contents
+ rel
->r_offset
- 4 + i
)
2828 BFD_ASSERT (rel
->r_offset
+ 12 <= input_section
->size
);
2829 for (i
= 0; i
< 4; i
++)
2830 BFD_ASSERT (bfd_get_8 (input_bfd
,
2831 contents
+ rel
->r_offset
+ 4 + i
)
2833 BFD_ASSERT (rel
+ 1 < relend
);
2834 BFD_ASSERT (ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
);
2835 memcpy (contents
+ rel
->r_offset
- 4,
2836 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
2839 relocation
= (htab
->sgot
->output_section
->vma
2840 + htab
->sgot
->output_offset
+ off
2842 - input_section
->output_section
->vma
2843 - input_section
->output_offset
2845 bfd_put_32 (output_bfd
, relocation
,
2846 contents
+ rel
->r_offset
+ 8);
2847 /* Skip R_X86_64_PLT32. */
2851 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
2853 /* GDesc -> IE transition.
2854 It's originally something like:
2855 leaq x@tlsdesc(%rip), %rax
2858 movq x@gottpoff(%rip), %rax # before nop; nop
2860 Registers other than %rax may be set up here. */
2862 unsigned int val
, type
, type2
;
2865 /* First, make sure it's a leaq adding rip to a 32-bit
2866 offset into any register, although it's probably
2867 almost always going to be rax. */
2868 roff
= rel
->r_offset
;
2869 BFD_ASSERT (roff
>= 3);
2870 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
2871 BFD_ASSERT ((type
& 0xfb) == 0x48);
2872 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
2873 BFD_ASSERT (type2
== 0x8d);
2874 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
2875 BFD_ASSERT ((val
& 0xc7) == 0x05);
2876 BFD_ASSERT (roff
+ 4 <= input_section
->size
);
2878 /* Now modify the instruction as appropriate. */
2879 /* To turn a leaq into a movq in the form we use it, it
2880 suffices to change the second byte from 0x8d to
2882 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
2884 bfd_put_32 (output_bfd
,
2885 htab
->sgot
->output_section
->vma
2886 + htab
->sgot
->output_offset
+ off
2888 - input_section
->output_section
->vma
2889 - input_section
->output_offset
2894 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
2896 /* GDesc -> IE transition.
2903 unsigned int val
, type
;
2906 /* First, make sure it's a call *(%eax). */
2907 roff
= rel
->r_offset
;
2908 BFD_ASSERT (roff
+ 2 <= input_section
->size
);
2909 type
= bfd_get_8 (input_bfd
, contents
+ roff
);
2910 BFD_ASSERT (type
== 0xff);
2911 val
= bfd_get_8 (input_bfd
, contents
+ roff
+ 1);
2912 BFD_ASSERT (val
== 0x10);
2914 /* Now modify the instruction as appropriate. Use
2915 xchg %ax,%ax instead of 2 nops. */
2916 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
2917 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
2925 case R_X86_64_TLSLD
:
2928 /* LD->LE transition:
2930 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt.
2932 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
2933 BFD_ASSERT (rel
->r_offset
>= 3);
2934 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 3)
2936 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2)
2938 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1)
2940 BFD_ASSERT (rel
->r_offset
+ 9 <= input_section
->size
);
2941 BFD_ASSERT (bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
+ 4)
2943 BFD_ASSERT (rel
+ 1 < relend
);
2944 BFD_ASSERT (ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
);
2945 memcpy (contents
+ rel
->r_offset
- 3,
2946 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
2947 /* Skip R_X86_64_PLT32. */
2952 if (htab
->sgot
== NULL
)
2955 off
= htab
->tls_ld_got
.offset
;
2960 Elf_Internal_Rela outrel
;
2963 if (htab
->srelgot
== NULL
)
2966 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
2967 + htab
->sgot
->output_offset
+ off
);
2969 bfd_put_64 (output_bfd
, 0,
2970 htab
->sgot
->contents
+ off
);
2971 bfd_put_64 (output_bfd
, 0,
2972 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
2973 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_DTPMOD64
);
2974 outrel
.r_addend
= 0;
2975 loc
= htab
->srelgot
->contents
;
2976 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
2977 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2978 htab
->tls_ld_got
.offset
|= 1;
2980 relocation
= htab
->sgot
->output_section
->vma
2981 + htab
->sgot
->output_offset
+ off
;
2982 unresolved_reloc
= FALSE
;
2985 case R_X86_64_DTPOFF32
:
2986 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
2987 relocation
-= dtpoff_base (info
);
2989 relocation
= tpoff (info
, relocation
);
2992 case R_X86_64_TPOFF32
:
2993 BFD_ASSERT (! info
->shared
);
2994 relocation
= tpoff (info
, relocation
);
3001 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3002 because such sections are not SEC_ALLOC and thus ld.so will
3003 not process them. */
3004 if (unresolved_reloc
3005 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3007 (*_bfd_error_handler
)
3008 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3011 (long) rel
->r_offset
,
3013 h
->root
.root
.string
);
3015 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3016 contents
, rel
->r_offset
,
3017 relocation
, rel
->r_addend
);
3019 if (r
!= bfd_reloc_ok
)
3024 name
= h
->root
.root
.string
;
3027 name
= bfd_elf_string_from_elf_section (input_bfd
,
3028 symtab_hdr
->sh_link
,
3033 name
= bfd_section_name (input_bfd
, sec
);
3036 if (r
== bfd_reloc_overflow
)
3038 if (! ((*info
->callbacks
->reloc_overflow
)
3039 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3040 (bfd_vma
) 0, input_bfd
, input_section
,
3046 (*_bfd_error_handler
)
3047 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3048 input_bfd
, input_section
,
3049 (long) rel
->r_offset
, name
, (int) r
);
3058 /* Finish up dynamic symbol handling. We set the contents of various
3059 dynamic sections here. */
3062 elf64_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3063 struct bfd_link_info
*info
,
3064 struct elf_link_hash_entry
*h
,
3065 Elf_Internal_Sym
*sym
)
3067 struct elf64_x86_64_link_hash_table
*htab
;
3069 htab
= elf64_x86_64_hash_table (info
);
3071 if (h
->plt
.offset
!= (bfd_vma
) -1)
3075 Elf_Internal_Rela rela
;
3078 /* This symbol has an entry in the procedure linkage table. Set
3080 if (h
->dynindx
== -1
3081 || htab
->splt
== NULL
3082 || htab
->sgotplt
== NULL
3083 || htab
->srelplt
== NULL
)
3086 /* Get the index in the procedure linkage table which
3087 corresponds to this symbol. This is the index of this symbol
3088 in all the symbols for which we are making plt entries. The
3089 first entry in the procedure linkage table is reserved. */
3090 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3092 /* Get the offset into the .got table of the entry that
3093 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3094 bytes. The first three are reserved for the dynamic linker. */
3095 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3097 /* Fill in the entry in the procedure linkage table. */
3098 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf64_x86_64_plt_entry
,
3101 /* Insert the relocation positions of the plt section. The magic
3102 numbers at the end of the statements are the positions of the
3103 relocations in the plt section. */
3104 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3105 instruction uses 6 bytes, subtract this value. */
3106 bfd_put_32 (output_bfd
,
3107 (htab
->sgotplt
->output_section
->vma
3108 + htab
->sgotplt
->output_offset
3110 - htab
->splt
->output_section
->vma
3111 - htab
->splt
->output_offset
3114 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
3115 /* Put relocation index. */
3116 bfd_put_32 (output_bfd
, plt_index
,
3117 htab
->splt
->contents
+ h
->plt
.offset
+ 7);
3118 /* Put offset for jmp .PLT0. */
3119 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3120 htab
->splt
->contents
+ h
->plt
.offset
+ 12);
3122 /* Fill in the entry in the global offset table, initially this
3123 points to the pushq instruction in the PLT which is at offset 6. */
3124 bfd_put_64 (output_bfd
, (htab
->splt
->output_section
->vma
3125 + htab
->splt
->output_offset
3126 + h
->plt
.offset
+ 6),
3127 htab
->sgotplt
->contents
+ got_offset
);
3129 /* Fill in the entry in the .rela.plt section. */
3130 rela
.r_offset
= (htab
->sgotplt
->output_section
->vma
3131 + htab
->sgotplt
->output_offset
3133 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_JUMP_SLOT
);
3135 loc
= htab
->srelplt
->contents
+ plt_index
* sizeof (Elf64_External_Rela
);
3136 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3138 if (!h
->def_regular
)
3140 /* Mark the symbol as undefined, rather than as defined in
3141 the .plt section. Leave the value if there were any
3142 relocations where pointer equality matters (this is a clue
3143 for the dynamic linker, to make function pointer
3144 comparisons work between an application and shared
3145 library), otherwise set it to zero. If a function is only
3146 called from a binary, there is no need to slow down
3147 shared libraries because of that. */
3148 sym
->st_shndx
= SHN_UNDEF
;
3149 if (!h
->pointer_equality_needed
)
3154 if (h
->got
.offset
!= (bfd_vma
) -1
3155 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h
)->tls_type
)
3156 && elf64_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
3158 Elf_Internal_Rela rela
;
3161 /* This symbol has an entry in the global offset table. Set it
3163 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
3166 rela
.r_offset
= (htab
->sgot
->output_section
->vma
3167 + htab
->sgot
->output_offset
3168 + (h
->got
.offset
&~ (bfd_vma
) 1));
3170 /* If this is a static link, or it is a -Bsymbolic link and the
3171 symbol is defined locally or was forced to be local because
3172 of a version file, we just want to emit a RELATIVE reloc.
3173 The entry in the global offset table will already have been
3174 initialized in the relocate_section function. */
3176 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3178 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3179 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3180 rela
.r_addend
= (h
->root
.u
.def
.value
3181 + h
->root
.u
.def
.section
->output_section
->vma
3182 + h
->root
.u
.def
.section
->output_offset
);
3186 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3187 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
3188 htab
->sgot
->contents
+ h
->got
.offset
);
3189 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_GLOB_DAT
);
3193 loc
= htab
->srelgot
->contents
;
3194 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3195 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3200 Elf_Internal_Rela rela
;
3203 /* This symbol needs a copy reloc. Set it up. */
3205 if (h
->dynindx
== -1
3206 || (h
->root
.type
!= bfd_link_hash_defined
3207 && h
->root
.type
!= bfd_link_hash_defweak
)
3208 || htab
->srelbss
== NULL
)
3211 rela
.r_offset
= (h
->root
.u
.def
.value
3212 + h
->root
.u
.def
.section
->output_section
->vma
3213 + h
->root
.u
.def
.section
->output_offset
);
3214 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_COPY
);
3216 loc
= htab
->srelbss
->contents
;
3217 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3218 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
3221 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3222 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3223 || h
== htab
->elf
.hgot
)
3224 sym
->st_shndx
= SHN_ABS
;
3229 /* Used to decide how to sort relocs in an optimal manner for the
3230 dynamic linker, before writing them out. */
3232 static enum elf_reloc_type_class
3233 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
3235 switch ((int) ELF64_R_TYPE (rela
->r_info
))
3237 case R_X86_64_RELATIVE
:
3238 return reloc_class_relative
;
3239 case R_X86_64_JUMP_SLOT
:
3240 return reloc_class_plt
;
3242 return reloc_class_copy
;
3244 return reloc_class_normal
;
3248 /* Finish up the dynamic sections. */
3251 elf64_x86_64_finish_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
3253 struct elf64_x86_64_link_hash_table
*htab
;
3257 htab
= elf64_x86_64_hash_table (info
);
3258 dynobj
= htab
->elf
.dynobj
;
3259 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3261 if (htab
->elf
.dynamic_sections_created
)
3263 Elf64_External_Dyn
*dyncon
, *dynconend
;
3265 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
3268 dyncon
= (Elf64_External_Dyn
*) sdyn
->contents
;
3269 dynconend
= (Elf64_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3270 for (; dyncon
< dynconend
; dyncon
++)
3272 Elf_Internal_Dyn dyn
;
3275 bfd_elf64_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3284 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3288 dyn
.d_un
.d_ptr
= htab
->srelplt
->output_section
->vma
;
3292 s
= htab
->srelplt
->output_section
;
3293 dyn
.d_un
.d_val
= s
->size
;
3297 /* The procedure linkage table relocs (DT_JMPREL) should
3298 not be included in the overall relocs (DT_RELA).
3299 Therefore, we override the DT_RELASZ entry here to
3300 make it not include the JMPREL relocs. Since the
3301 linker script arranges for .rela.plt to follow all
3302 other relocation sections, we don't have to worry
3303 about changing the DT_RELA entry. */
3304 if (htab
->srelplt
!= NULL
)
3306 s
= htab
->srelplt
->output_section
;
3307 dyn
.d_un
.d_val
-= s
->size
;
3311 case DT_TLSDESC_PLT
:
3313 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
3314 + htab
->tlsdesc_plt
;
3317 case DT_TLSDESC_GOT
:
3319 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
3320 + htab
->tlsdesc_got
;
3324 bfd_elf64_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3327 /* Fill in the special first entry in the procedure linkage table. */
3328 if (htab
->splt
&& htab
->splt
->size
> 0)
3330 /* Fill in the first entry in the procedure linkage table. */
3331 memcpy (htab
->splt
->contents
, elf64_x86_64_plt0_entry
,
3333 /* Add offset for pushq GOT+8(%rip), since the instruction
3334 uses 6 bytes subtract this value. */
3335 bfd_put_32 (output_bfd
,
3336 (htab
->sgotplt
->output_section
->vma
3337 + htab
->sgotplt
->output_offset
3339 - htab
->splt
->output_section
->vma
3340 - htab
->splt
->output_offset
3342 htab
->splt
->contents
+ 2);
3343 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
3344 the end of the instruction. */
3345 bfd_put_32 (output_bfd
,
3346 (htab
->sgotplt
->output_section
->vma
3347 + htab
->sgotplt
->output_offset
3349 - htab
->splt
->output_section
->vma
3350 - htab
->splt
->output_offset
3352 htab
->splt
->contents
+ 8);
3354 elf_section_data (htab
->splt
->output_section
)->this_hdr
.sh_entsize
=
3357 if (htab
->tlsdesc_plt
)
3359 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
3360 htab
->sgot
->contents
+ htab
->tlsdesc_got
);
3362 memcpy (htab
->splt
->contents
+ htab
->tlsdesc_plt
,
3363 elf64_x86_64_plt0_entry
,
3366 /* Add offset for pushq GOT+8(%rip), since the
3367 instruction uses 6 bytes subtract this value. */
3368 bfd_put_32 (output_bfd
,
3369 (htab
->sgotplt
->output_section
->vma
3370 + htab
->sgotplt
->output_offset
3372 - htab
->splt
->output_section
->vma
3373 - htab
->splt
->output_offset
3376 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 2);
3377 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
3378 htab->tlsdesc_got. The 12 is the offset to the end of
3380 bfd_put_32 (output_bfd
,
3381 (htab
->sgot
->output_section
->vma
3382 + htab
->sgot
->output_offset
3384 - htab
->splt
->output_section
->vma
3385 - htab
->splt
->output_offset
3388 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 8);
3395 /* Fill in the first three entries in the global offset table. */
3396 if (htab
->sgotplt
->size
> 0)
3398 /* Set the first entry in the global offset table to the address of
3399 the dynamic section. */
3401 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
);
3403 bfd_put_64 (output_bfd
,
3404 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
3405 htab
->sgotplt
->contents
);
3406 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
3407 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
);
3408 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
3411 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
=
3415 if (htab
->sgot
&& htab
->sgot
->size
> 0)
3416 elf_section_data (htab
->sgot
->output_section
)->this_hdr
.sh_entsize
3422 /* Return address for Ith PLT stub in section PLT, for relocation REL
3423 or (bfd_vma) -1 if it should not be included. */
3426 elf64_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
3427 const arelent
*rel ATTRIBUTE_UNUSED
)
3429 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
3432 /* Handle an x86-64 specific section when reading an object file. This
3433 is called when elfcode.h finds a section with an unknown type. */
3436 elf64_x86_64_section_from_shdr (bfd
*abfd
,
3437 Elf_Internal_Shdr
*hdr
,
3441 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
3444 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
3450 /* Hook called by the linker routine which adds symbols from an object
3451 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
3455 elf64_x86_64_add_symbol_hook (bfd
*abfd
,
3456 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3457 Elf_Internal_Sym
*sym
,
3458 const char **namep ATTRIBUTE_UNUSED
,
3459 flagword
*flagsp ATTRIBUTE_UNUSED
,
3460 asection
**secp
, bfd_vma
*valp
)
3464 switch (sym
->st_shndx
)
3466 case SHN_X86_64_LCOMMON
:
3467 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
3470 lcomm
= bfd_make_section_with_flags (abfd
,
3474 | SEC_LINKER_CREATED
));
3477 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
3480 *valp
= sym
->st_size
;
3487 /* Given a BFD section, try to locate the corresponding ELF section
3491 elf64_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
3492 asection
*sec
, int *index
)
3494 if (sec
== &_bfd_elf_large_com_section
)
3496 *index
= SHN_X86_64_LCOMMON
;
3502 /* Process a symbol. */
3505 elf64_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
3508 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
3510 switch (elfsym
->internal_elf_sym
.st_shndx
)
3512 case SHN_X86_64_LCOMMON
:
3513 asym
->section
= &_bfd_elf_large_com_section
;
3514 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
3515 /* Common symbol doesn't set BSF_GLOBAL. */
3516 asym
->flags
&= ~BSF_GLOBAL
;
3522 elf64_x86_64_common_definition (Elf_Internal_Sym
*sym
)
3524 return (sym
->st_shndx
== SHN_COMMON
3525 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
3529 elf64_x86_64_common_section_index (asection
*sec
)
3531 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
3534 return SHN_X86_64_LCOMMON
;
3538 elf64_x86_64_common_section (asection
*sec
)
3540 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
3541 return bfd_com_section_ptr
;
3543 return &_bfd_elf_large_com_section
;
3547 elf64_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3548 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
3549 struct elf_link_hash_entry
*h
,
3550 Elf_Internal_Sym
*sym
,
3552 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
3553 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
3554 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
3555 bfd_boolean
*override ATTRIBUTE_UNUSED
,
3556 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
3557 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
3558 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
3559 bfd_boolean
*newdyn
,
3560 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
3561 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
3562 bfd
*abfd ATTRIBUTE_UNUSED
,
3564 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
3565 bfd_boolean
*olddyn
,
3566 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
3567 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
3571 /* A normal common symbol and a large common symbol result in a
3572 normal common symbol. We turn the large common symbol into a
3575 && h
->root
.type
== bfd_link_hash_common
3577 && bfd_is_com_section (*sec
)
3580 if (sym
->st_shndx
== SHN_COMMON
3581 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
3583 h
->root
.u
.c
.p
->section
3584 = bfd_make_section_old_way (oldbfd
, "COMMON");
3585 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
3587 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
3588 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
3589 *psec
= *sec
= bfd_com_section_ptr
;
3596 elf64_x86_64_additional_program_headers (bfd
*abfd
,
3597 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
3602 /* Check to see if we need a large readonly segment. */
3603 s
= bfd_get_section_by_name (abfd
, ".lrodata");
3604 if (s
&& (s
->flags
& SEC_LOAD
))
3607 /* Check to see if we need a large data segment. Since .lbss sections
3608 is placed right after the .bss section, there should be no need for
3609 a large data segment just because of .lbss. */
3610 s
= bfd_get_section_by_name (abfd
, ".ldata");
3611 if (s
&& (s
->flags
& SEC_LOAD
))
3617 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
3620 elf64_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
3622 if (h
->plt
.offset
!= (bfd_vma
) -1
3624 && !h
->pointer_equality_needed
)
3627 return _bfd_elf_hash_symbol (h
);
3630 static const struct bfd_elf_special_section
3631 elf64_x86_64_special_sections
[]=
3633 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3634 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
3635 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
3636 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3637 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
3638 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
3639 { NULL
, 0, 0, 0, 0 }
3642 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
3643 #define TARGET_LITTLE_NAME "elf64-x86-64"
3644 #define ELF_ARCH bfd_arch_i386
3645 #define ELF_MACHINE_CODE EM_X86_64
3646 #define ELF_MAXPAGESIZE 0x200000
3647 #define ELF_MINPAGESIZE 0x1000
3648 #define ELF_COMMONPAGESIZE 0x1000
3650 #define elf_backend_can_gc_sections 1
3651 #define elf_backend_can_refcount 1
3652 #define elf_backend_want_got_plt 1
3653 #define elf_backend_plt_readonly 1
3654 #define elf_backend_want_plt_sym 0
3655 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
3656 #define elf_backend_rela_normal 1
3658 #define elf_info_to_howto elf64_x86_64_info_to_howto
3660 #define bfd_elf64_bfd_link_hash_table_create \
3661 elf64_x86_64_link_hash_table_create
3662 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
3664 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
3665 #define elf_backend_check_relocs elf64_x86_64_check_relocs
3666 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
3667 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
3668 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
3669 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
3670 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
3671 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
3672 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
3673 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
3674 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
3675 #define elf_backend_relocate_section elf64_x86_64_relocate_section
3676 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
3677 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
3678 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3679 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
3680 #define elf_backend_object_p elf64_x86_64_elf_object_p
3681 #define bfd_elf64_mkobject elf64_x86_64_mkobject
3683 #define elf_backend_section_from_shdr \
3684 elf64_x86_64_section_from_shdr
3686 #define elf_backend_section_from_bfd_section \
3687 elf64_x86_64_elf_section_from_bfd_section
3688 #define elf_backend_add_symbol_hook \
3689 elf64_x86_64_add_symbol_hook
3690 #define elf_backend_symbol_processing \
3691 elf64_x86_64_symbol_processing
3692 #define elf_backend_common_section_index \
3693 elf64_x86_64_common_section_index
3694 #define elf_backend_common_section \
3695 elf64_x86_64_common_section
3696 #define elf_backend_common_definition \
3697 elf64_x86_64_common_definition
3698 #define elf_backend_merge_symbol \
3699 elf64_x86_64_merge_symbol
3700 #define elf_backend_special_sections \
3701 elf64_x86_64_special_sections
3702 #define elf_backend_additional_program_headers \
3703 elf64_x86_64_additional_program_headers
3704 #define elf_backend_hash_symbol \
3705 elf64_x86_64_hash_symbol
3707 #include "elf64-target.h"
3709 /* FreeBSD support. */
3711 #undef TARGET_LITTLE_SYM
3712 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
3713 #undef TARGET_LITTLE_NAME
3714 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
3717 #define ELF_OSABI ELFOSABI_FREEBSD
3719 #undef elf_backend_post_process_headers
3720 #define elf_backend_post_process_headers _bfd_elf_set_osabi
3723 #define elf64_bed elf64_x86_64_fbsd_bed
3725 #include "elf64-target.h"