1 /* X86-64 specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Jan Hubicka <jh@suse.cz>.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "elf/x86-64.h"
34 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
35 #define MINUS_ONE (~ (bfd_vma) 0)
37 /* The relocation "howto" table. Order of fields:
38 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
39 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
40 static reloc_howto_type x86_64_elf_howto_table
[] =
42 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
43 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
45 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
46 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
48 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
49 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
51 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
52 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
54 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
55 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
57 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
58 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
60 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
61 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
63 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
64 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
66 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
67 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
69 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
70 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
72 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
73 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
76 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
78 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
79 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
80 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
81 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
82 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
84 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
85 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
86 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
87 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
89 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
90 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
92 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
93 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
95 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
96 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
98 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
99 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
101 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
102 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
104 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
105 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
107 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
108 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
110 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
111 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
113 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
114 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
115 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
116 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
117 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
118 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
119 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
120 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
122 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
123 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
125 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
126 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
127 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
128 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
129 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
131 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
132 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
136 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
137 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
138 "R_X86_64_GOTPC32_TLSDESC",
139 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
140 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
141 complain_overflow_dont
, bfd_elf_generic_reloc
,
142 "R_X86_64_TLSDESC_CALL",
144 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
145 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
147 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
148 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
149 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
152 /* We have a gap in the reloc numbers here.
153 R_X86_64_standard counts the number up to this point, and
154 R_X86_64_vt_offset is the value to subtract from a reloc type of
155 R_X86_64_GNU_VT* to form an index into this table. */
156 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
157 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
159 /* GNU extension to record C++ vtable hierarchy. */
160 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
161 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
163 /* GNU extension to record C++ vtable member usage. */
164 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
165 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
169 #define IS_X86_64_PCREL_TYPE(TYPE) \
170 ( ((TYPE) == R_X86_64_PC8) \
171 || ((TYPE) == R_X86_64_PC16) \
172 || ((TYPE) == R_X86_64_PC32) \
173 || ((TYPE) == R_X86_64_PC64))
175 /* Map BFD relocs to the x86_64 elf relocs. */
178 bfd_reloc_code_real_type bfd_reloc_val
;
179 unsigned char elf_reloc_val
;
182 static const struct elf_reloc_map x86_64_reloc_map
[] =
184 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
185 { BFD_RELOC_64
, R_X86_64_64
, },
186 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
187 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
188 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
189 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
190 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
191 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
192 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
193 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
194 { BFD_RELOC_32
, R_X86_64_32
, },
195 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
196 { BFD_RELOC_16
, R_X86_64_16
, },
197 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
198 { BFD_RELOC_8
, R_X86_64_8
, },
199 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
200 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
201 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
202 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
203 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
204 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
205 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
206 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
207 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
208 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
209 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
210 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
211 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
212 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
213 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
214 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
215 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
216 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
217 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
218 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
219 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
220 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
221 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
224 static reloc_howto_type
*
225 elf64_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
229 if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
230 || r_type
>= (unsigned int) R_X86_64_max
)
232 if (r_type
>= (unsigned int) R_X86_64_standard
)
234 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
236 r_type
= R_X86_64_NONE
;
241 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
242 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
243 return &x86_64_elf_howto_table
[i
];
246 /* Given a BFD reloc type, return a HOWTO structure. */
247 static reloc_howto_type
*
248 elf64_x86_64_reloc_type_lookup (bfd
*abfd
,
249 bfd_reloc_code_real_type code
)
253 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
256 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
257 return elf64_x86_64_rtype_to_howto (abfd
,
258 x86_64_reloc_map
[i
].elf_reloc_val
);
263 static reloc_howto_type
*
264 elf64_x86_64_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
270 i
< (sizeof (x86_64_elf_howto_table
)
271 / sizeof (x86_64_elf_howto_table
[0]));
273 if (x86_64_elf_howto_table
[i
].name
!= NULL
274 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
275 return &x86_64_elf_howto_table
[i
];
280 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
283 elf64_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
284 Elf_Internal_Rela
*dst
)
288 r_type
= ELF64_R_TYPE (dst
->r_info
);
289 cache_ptr
->howto
= elf64_x86_64_rtype_to_howto (abfd
, r_type
);
290 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
293 /* Support for core dump NOTE sections. */
295 elf64_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
300 switch (note
->descsz
)
305 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
307 elf_tdata (abfd
)->core_signal
308 = bfd_get_16 (abfd
, note
->descdata
+ 12);
311 elf_tdata (abfd
)->core_pid
312 = bfd_get_32 (abfd
, note
->descdata
+ 32);
321 /* Make a ".reg/999" section. */
322 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
323 size
, note
->descpos
+ offset
);
327 elf64_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
329 switch (note
->descsz
)
334 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
335 elf_tdata (abfd
)->core_program
336 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
337 elf_tdata (abfd
)->core_command
338 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
341 /* Note that for some reason, a spurious space is tacked
342 onto the end of the args in some (at least one anyway)
343 implementations, so strip it off if it exists. */
346 char *command
= elf_tdata (abfd
)->core_command
;
347 int n
= strlen (command
);
349 if (0 < n
&& command
[n
- 1] == ' ')
350 command
[n
- 1] = '\0';
356 /* Functions for the x86-64 ELF linker. */
358 /* The name of the dynamic interpreter. This is put in the .interp
361 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
363 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
364 copying dynamic variables from a shared lib into an app's dynbss
365 section, and instead use a dynamic relocation to point into the
367 #define ELIMINATE_COPY_RELOCS 1
369 /* The size in bytes of an entry in the global offset table. */
371 #define GOT_ENTRY_SIZE 8
373 /* The size in bytes of an entry in the procedure linkage table. */
375 #define PLT_ENTRY_SIZE 16
377 /* The first entry in a procedure linkage table looks like this. See the
378 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
380 static const bfd_byte elf64_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
382 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
383 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
384 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
387 /* Subsequent entries in a procedure linkage table look like this. */
389 static const bfd_byte elf64_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
391 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
392 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
393 0x68, /* pushq immediate */
394 0, 0, 0, 0, /* replaced with index into relocation table. */
395 0xe9, /* jmp relative */
396 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
399 /* The x86-64 linker needs to keep track of the number of relocs that
400 it decides to copy as dynamic relocs in check_relocs for each symbol.
401 This is so that it can later discard them if they are found to be
402 unnecessary. We store the information in a field extending the
403 regular ELF linker hash table. */
405 struct elf64_x86_64_dyn_relocs
408 struct elf64_x86_64_dyn_relocs
*next
;
410 /* The input section of the reloc. */
413 /* Total number of relocs copied for the input section. */
416 /* Number of pc-relative relocs copied for the input section. */
417 bfd_size_type pc_count
;
420 /* x86-64 ELF linker hash entry. */
422 struct elf64_x86_64_link_hash_entry
424 struct elf_link_hash_entry elf
;
426 /* Track dynamic relocs copied for this symbol. */
427 struct elf64_x86_64_dyn_relocs
*dyn_relocs
;
429 #define GOT_UNKNOWN 0
433 #define GOT_TLS_GDESC 4
434 #define GOT_TLS_GD_BOTH_P(type) \
435 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
436 #define GOT_TLS_GD_P(type) \
437 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
438 #define GOT_TLS_GDESC_P(type) \
439 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
440 #define GOT_TLS_GD_ANY_P(type) \
441 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
442 unsigned char tls_type
;
444 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
445 starting at the end of the jump table. */
449 #define elf64_x86_64_hash_entry(ent) \
450 ((struct elf64_x86_64_link_hash_entry *)(ent))
452 struct elf64_x86_64_obj_tdata
454 struct elf_obj_tdata root
;
456 /* tls_type for each local got entry. */
457 char *local_got_tls_type
;
459 /* GOTPLT entries for TLS descriptors. */
460 bfd_vma
*local_tlsdesc_gotent
;
463 #define elf64_x86_64_tdata(abfd) \
464 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
466 #define elf64_x86_64_local_got_tls_type(abfd) \
467 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
469 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
470 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
472 #define is_x86_64_elf(bfd) \
473 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
474 && elf_tdata (bfd) != NULL \
475 && elf_object_id (bfd) == X86_64_ELF_TDATA)
478 elf64_x86_64_mkobject (bfd
*abfd
)
480 return bfd_elf_allocate_object (abfd
, sizeof (struct elf64_x86_64_obj_tdata
),
484 /* x86-64 ELF linker hash table. */
486 struct elf64_x86_64_link_hash_table
488 struct elf_link_hash_table elf
;
490 /* Short-cuts to get to dynamic linker sections. */
503 /* The offset into splt of the PLT entry for the TLS descriptor
504 resolver. Special values are 0, if not necessary (or not found
505 to be necessary yet), and -1 if needed but not determined
508 /* The offset into sgot of the GOT entry used by the PLT entry
513 bfd_signed_vma refcount
;
517 /* The amount of space used by the jump slots in the GOT. */
518 bfd_vma sgotplt_jump_table_size
;
520 /* Small local sym to section mapping cache. */
521 struct sym_sec_cache sym_sec
;
523 /* _TLS_MODULE_BASE_ symbol. */
524 struct bfd_link_hash_entry
*tls_module_base
;
526 /* Used by local STT_GNU_IFUNC symbols. */
527 htab_t loc_hash_table
;
528 void *loc_hash_memory
;
531 /* Get the x86-64 ELF linker hash table from a link_info structure. */
533 #define elf64_x86_64_hash_table(p) \
534 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
536 #define elf64_x86_64_compute_jump_table_size(htab) \
537 ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE)
539 /* Create an entry in an x86-64 ELF linker hash table. */
541 static struct bfd_hash_entry
*
542 elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
543 struct bfd_hash_table
*table
,
546 /* Allocate the structure if it has not already been allocated by a
550 entry
= bfd_hash_allocate (table
,
551 sizeof (struct elf64_x86_64_link_hash_entry
));
556 /* Call the allocation method of the superclass. */
557 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
560 struct elf64_x86_64_link_hash_entry
*eh
;
562 eh
= (struct elf64_x86_64_link_hash_entry
*) entry
;
563 eh
->dyn_relocs
= NULL
;
564 eh
->tls_type
= GOT_UNKNOWN
;
565 eh
->tlsdesc_got
= (bfd_vma
) -1;
572 elf64_x86_64_local_hash (int id
, int r_sym
)
574 return ((((id
& 0xff) << 24) | ((id
& 0xff00) << 8))
575 ^ r_sym
^ (id
>> 16));
578 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
579 for local symbol so that we can handle local STT_GNU_IFUNC symbols
580 as global symbol. We reuse indx and dynstr_index for local symbol
581 hash since they aren't used by global symbols in this backend. */
584 elf64_x86_64_local_htab_hash (const void *ptr
)
586 struct elf_link_hash_entry
*h
587 = (struct elf_link_hash_entry
*) ptr
;
588 return elf64_x86_64_local_hash (h
->indx
, h
->dynstr_index
);
591 /* Compare local hash entries. */
594 elf64_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
596 struct elf_link_hash_entry
*h1
597 = (struct elf_link_hash_entry
*) ptr1
;
598 struct elf_link_hash_entry
*h2
599 = (struct elf_link_hash_entry
*) ptr2
;
601 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
604 /* Find and/or create a hash entry for local symbol. */
606 static struct elf_link_hash_entry
*
607 elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table
*htab
,
608 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
611 struct elf64_x86_64_link_hash_entry e
, *ret
;
612 asection
*sec
= abfd
->sections
;
613 hashval_t h
= elf64_x86_64_local_hash (sec
->id
,
614 ELF64_R_SYM (rel
->r_info
));
617 e
.elf
.indx
= sec
->id
;
618 e
.elf
.dynstr_index
= ELF64_R_SYM (rel
->r_info
);
619 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
620 create
? INSERT
: NO_INSERT
);
627 ret
= (struct elf64_x86_64_link_hash_entry
*) *slot
;
631 ret
= (struct elf64_x86_64_link_hash_entry
*)
632 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
633 sizeof (struct elf64_x86_64_link_hash_entry
));
636 memset (ret
, 0, sizeof (*ret
));
637 ret
->elf
.indx
= sec
->id
;
638 ret
->elf
.dynstr_index
= ELF64_R_SYM (rel
->r_info
);
639 ret
->elf
.dynindx
= -1;
640 ret
->elf
.plt
.offset
= (bfd_vma
) -1;
641 ret
->elf
.got
.offset
= (bfd_vma
) -1;
647 /* Create an X86-64 ELF linker hash table. */
649 static struct bfd_link_hash_table
*
650 elf64_x86_64_link_hash_table_create (bfd
*abfd
)
652 struct elf64_x86_64_link_hash_table
*ret
;
653 bfd_size_type amt
= sizeof (struct elf64_x86_64_link_hash_table
);
655 ret
= (struct elf64_x86_64_link_hash_table
*) bfd_malloc (amt
);
659 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
660 elf64_x86_64_link_hash_newfunc
,
661 sizeof (struct elf64_x86_64_link_hash_entry
)))
677 ret
->irelifunc
= NULL
;
678 ret
->sym_sec
.abfd
= NULL
;
679 ret
->tlsdesc_plt
= 0;
680 ret
->tlsdesc_got
= 0;
681 ret
->tls_ld_got
.refcount
= 0;
682 ret
->sgotplt_jump_table_size
= 0;
683 ret
->tls_module_base
= NULL
;
685 ret
->loc_hash_table
= htab_try_create (1024,
686 elf64_x86_64_local_htab_hash
,
687 elf64_x86_64_local_htab_eq
,
689 ret
->loc_hash_memory
= objalloc_create ();
690 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
696 return &ret
->elf
.root
;
699 /* Destroy an X86-64 ELF linker hash table. */
702 elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table
*hash
)
704 struct elf64_x86_64_link_hash_table
*htab
705 = (struct elf64_x86_64_link_hash_table
*) hash
;
707 if (htab
->loc_hash_table
)
708 htab_delete (htab
->loc_hash_table
);
709 if (htab
->loc_hash_memory
)
710 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
711 _bfd_generic_link_hash_table_free (hash
);
714 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
715 shortcuts to them in our hash table. */
718 elf64_x86_64_create_got_section (bfd
*dynobj
, struct bfd_link_info
*info
)
720 struct elf64_x86_64_link_hash_table
*htab
;
722 if (! _bfd_elf_create_got_section (dynobj
, info
))
725 htab
= elf64_x86_64_hash_table (info
);
726 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
727 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
728 if (!htab
->sgot
|| !htab
->sgotplt
)
731 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rela.got",
732 (SEC_ALLOC
| SEC_LOAD
737 if (htab
->srelgot
== NULL
738 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 3))
743 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
744 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
748 elf64_x86_64_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
750 struct elf64_x86_64_link_hash_table
*htab
;
752 htab
= elf64_x86_64_hash_table (info
);
753 if (!htab
->sgot
&& !elf64_x86_64_create_got_section (dynobj
, info
))
756 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
759 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
760 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
761 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
763 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
765 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
766 || (!info
->shared
&& !htab
->srelbss
))
772 /* Copy the extra info we tack onto an elf_link_hash_entry. */
775 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
776 struct elf_link_hash_entry
*dir
,
777 struct elf_link_hash_entry
*ind
)
779 struct elf64_x86_64_link_hash_entry
*edir
, *eind
;
781 edir
= (struct elf64_x86_64_link_hash_entry
*) dir
;
782 eind
= (struct elf64_x86_64_link_hash_entry
*) ind
;
784 if (eind
->dyn_relocs
!= NULL
)
786 if (edir
->dyn_relocs
!= NULL
)
788 struct elf64_x86_64_dyn_relocs
**pp
;
789 struct elf64_x86_64_dyn_relocs
*p
;
791 /* Add reloc counts against the indirect sym to the direct sym
792 list. Merge any entries against the same section. */
793 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
795 struct elf64_x86_64_dyn_relocs
*q
;
797 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
798 if (q
->sec
== p
->sec
)
800 q
->pc_count
+= p
->pc_count
;
801 q
->count
+= p
->count
;
808 *pp
= edir
->dyn_relocs
;
811 edir
->dyn_relocs
= eind
->dyn_relocs
;
812 eind
->dyn_relocs
= NULL
;
815 if (ind
->root
.type
== bfd_link_hash_indirect
816 && dir
->got
.refcount
<= 0)
818 edir
->tls_type
= eind
->tls_type
;
819 eind
->tls_type
= GOT_UNKNOWN
;
822 if (ELIMINATE_COPY_RELOCS
823 && ind
->root
.type
!= bfd_link_hash_indirect
824 && dir
->dynamic_adjusted
)
826 /* If called to transfer flags for a weakdef during processing
827 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
828 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
829 dir
->ref_dynamic
|= ind
->ref_dynamic
;
830 dir
->ref_regular
|= ind
->ref_regular
;
831 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
832 dir
->needs_plt
|= ind
->needs_plt
;
833 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
836 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
840 elf64_x86_64_elf_object_p (bfd
*abfd
)
842 /* Set the right machine number for an x86-64 elf64 file. */
843 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
861 /* Return TRUE if the TLS access code sequence support transition
865 elf64_x86_64_check_tls_transition (bfd
*abfd
, asection
*sec
,
867 Elf_Internal_Shdr
*symtab_hdr
,
868 struct elf_link_hash_entry
**sym_hashes
,
870 const Elf_Internal_Rela
*rel
,
871 const Elf_Internal_Rela
*relend
)
874 unsigned long r_symndx
;
875 struct elf_link_hash_entry
*h
;
878 /* Get the section contents. */
879 if (contents
== NULL
)
881 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
882 contents
= elf_section_data (sec
)->this_hdr
.contents
;
885 /* FIXME: How to better handle error condition? */
886 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
889 /* Cache the section contents for elf_link_input_bfd. */
890 elf_section_data (sec
)->this_hdr
.contents
= contents
;
894 offset
= rel
->r_offset
;
899 if ((rel
+ 1) >= relend
)
902 if (r_type
== R_X86_64_TLSGD
)
904 /* Check transition from GD access model. Only
905 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
906 .word 0x6666; rex64; call __tls_get_addr
907 can transit to different access model. */
909 static x86_64_opcode32 leaq
= { { 0x66, 0x48, 0x8d, 0x3d } },
910 call
= { { 0x66, 0x66, 0x48, 0xe8 } };
912 || (offset
+ 12) > sec
->size
913 || bfd_get_32 (abfd
, contents
+ offset
- 4) != leaq
.i
914 || bfd_get_32 (abfd
, contents
+ offset
+ 4) != call
.i
)
919 /* Check transition from LD access model. Only
920 leaq foo@tlsld(%rip), %rdi;
922 can transit to different access model. */
924 static x86_64_opcode32 ld
= { { 0x48, 0x8d, 0x3d, 0xe8 } };
927 if (offset
< 3 || (offset
+ 9) > sec
->size
)
930 op
.i
= bfd_get_32 (abfd
, contents
+ offset
- 3);
931 op
.c
[3] = bfd_get_8 (abfd
, contents
+ offset
+ 4);
936 r_symndx
= ELF64_R_SYM (rel
[1].r_info
);
937 if (r_symndx
< symtab_hdr
->sh_info
)
940 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
941 /* Use strncmp to check __tls_get_addr since __tls_get_addr
944 && h
->root
.root
.string
!= NULL
945 && (ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
946 || ELF64_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
947 && (strncmp (h
->root
.root
.string
,
948 "__tls_get_addr", 14) == 0));
950 case R_X86_64_GOTTPOFF
:
951 /* Check transition from IE access model:
952 movq foo@gottpoff(%rip), %reg
953 addq foo@gottpoff(%rip), %reg
956 if (offset
< 3 || (offset
+ 4) > sec
->size
)
959 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
960 if (val
!= 0x48 && val
!= 0x4c)
963 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
964 if (val
!= 0x8b && val
!= 0x03)
967 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
968 return (val
& 0xc7) == 5;
970 case R_X86_64_GOTPC32_TLSDESC
:
971 /* Check transition from GDesc access model:
972 leaq x@tlsdesc(%rip), %rax
974 Make sure it's a leaq adding rip to a 32-bit offset
975 into any register, although it's probably almost always
978 if (offset
< 3 || (offset
+ 4) > sec
->size
)
981 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
982 if ((val
& 0xfb) != 0x48)
985 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
988 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
989 return (val
& 0xc7) == 0x05;
991 case R_X86_64_TLSDESC_CALL
:
992 /* Check transition from GDesc access model:
993 call *x@tlsdesc(%rax)
995 if (offset
+ 2 <= sec
->size
)
997 /* Make sure that it's a call *x@tlsdesc(%rax). */
998 static x86_64_opcode16 call
= { { 0xff, 0x10 } };
999 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
1009 /* Return TRUE if the TLS access transition is OK or no transition
1010 will be performed. Update R_TYPE if there is a transition. */
1013 elf64_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1014 asection
*sec
, bfd_byte
*contents
,
1015 Elf_Internal_Shdr
*symtab_hdr
,
1016 struct elf_link_hash_entry
**sym_hashes
,
1017 unsigned int *r_type
, int tls_type
,
1018 const Elf_Internal_Rela
*rel
,
1019 const Elf_Internal_Rela
*relend
,
1020 struct elf_link_hash_entry
*h
)
1022 unsigned int from_type
= *r_type
;
1023 unsigned int to_type
= from_type
;
1024 bfd_boolean check
= TRUE
;
1028 case R_X86_64_TLSGD
:
1029 case R_X86_64_GOTPC32_TLSDESC
:
1030 case R_X86_64_TLSDESC_CALL
:
1031 case R_X86_64_GOTTPOFF
:
1035 to_type
= R_X86_64_TPOFF32
;
1037 to_type
= R_X86_64_GOTTPOFF
;
1040 /* When we are called from elf64_x86_64_relocate_section,
1041 CONTENTS isn't NULL and there may be additional transitions
1042 based on TLS_TYPE. */
1043 if (contents
!= NULL
)
1045 unsigned int new_to_type
= to_type
;
1050 && tls_type
== GOT_TLS_IE
)
1051 new_to_type
= R_X86_64_TPOFF32
;
1053 if (to_type
== R_X86_64_TLSGD
1054 || to_type
== R_X86_64_GOTPC32_TLSDESC
1055 || to_type
== R_X86_64_TLSDESC_CALL
)
1057 if (tls_type
== GOT_TLS_IE
)
1058 new_to_type
= R_X86_64_GOTTPOFF
;
1061 /* We checked the transition before when we were called from
1062 elf64_x86_64_check_relocs. We only want to check the new
1063 transition which hasn't been checked before. */
1064 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1065 to_type
= new_to_type
;
1070 case R_X86_64_TLSLD
:
1072 to_type
= R_X86_64_TPOFF32
;
1079 /* Return TRUE if there is no transition. */
1080 if (from_type
== to_type
)
1083 /* Check if the transition can be performed. */
1085 && ! elf64_x86_64_check_tls_transition (abfd
, sec
, contents
,
1086 symtab_hdr
, sym_hashes
,
1087 from_type
, rel
, relend
))
1089 reloc_howto_type
*from
, *to
;
1091 from
= elf64_x86_64_rtype_to_howto (abfd
, from_type
);
1092 to
= elf64_x86_64_rtype_to_howto (abfd
, to_type
);
1094 (*_bfd_error_handler
)
1095 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1096 "in section `%A' failed"),
1097 abfd
, sec
, from
->name
, to
->name
,
1098 h
? h
->root
.root
.string
: "a local symbol",
1099 (unsigned long) rel
->r_offset
);
1100 bfd_set_error (bfd_error_bad_value
);
1108 /* Look through the relocs for a section during the first phase, and
1109 calculate needed space in the global offset table, procedure
1110 linkage table, and dynamic reloc sections. */
1113 elf64_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1115 const Elf_Internal_Rela
*relocs
)
1117 struct elf64_x86_64_link_hash_table
*htab
;
1118 Elf_Internal_Shdr
*symtab_hdr
;
1119 struct elf_link_hash_entry
**sym_hashes
;
1120 const Elf_Internal_Rela
*rel
;
1121 const Elf_Internal_Rela
*rel_end
;
1123 Elf_Internal_Sym
*isymbuf
;
1125 if (info
->relocatable
)
1128 BFD_ASSERT (is_x86_64_elf (abfd
));
1130 htab
= elf64_x86_64_hash_table (info
);
1131 symtab_hdr
= &elf_symtab_hdr (abfd
);
1132 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
1133 sym_hashes
= elf_sym_hashes (abfd
);
1137 rel_end
= relocs
+ sec
->reloc_count
;
1138 for (rel
= relocs
; rel
< rel_end
; rel
++)
1140 unsigned int r_type
;
1141 unsigned long r_symndx
;
1142 struct elf_link_hash_entry
*h
;
1144 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1145 r_type
= ELF64_R_TYPE (rel
->r_info
);
1147 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1149 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1154 if (r_symndx
< symtab_hdr
->sh_info
)
1156 /* A local symbol. */
1157 Elf_Internal_Sym
*isym
;
1159 /* Read this BFD's local symbols. */
1160 if (isymbuf
== NULL
)
1162 if (isymbuf
== NULL
)
1163 isymbuf
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
1164 symtab_hdr
->sh_info
, 0,
1166 if (isymbuf
== NULL
)
1170 /* Check relocation against local STT_GNU_IFUNC symbol. */
1171 isym
= isymbuf
+ r_symndx
;
1172 if (ELF64_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1174 h
= elf64_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1179 /* Fake a STT_GNU_IFUNC symbol. */
1180 h
->type
= STT_GNU_IFUNC
;
1183 h
->forced_local
= 1;
1184 h
->root
.type
= bfd_link_hash_defined
;
1191 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1192 while (h
->root
.type
== bfd_link_hash_indirect
1193 || h
->root
.type
== bfd_link_hash_warning
)
1194 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1199 /* Create the ifunc sections for static executables. If we
1200 never see an indirect function symbol nor we are building
1201 a static executable, those sections will be empty and
1202 won't appear in output. */
1213 case R_X86_64_PLT32
:
1214 case R_X86_64_GOTPCREL
:
1215 case R_X86_64_GOTPCREL64
:
1216 if (htab
->irelifunc
== NULL
&& htab
->iplt
== NULL
)
1218 if (!_bfd_elf_create_ifunc_sections (abfd
, info
))
1223 htab
->irelifunc
= bfd_get_section_by_name (abfd
,
1225 if (!htab
->irelifunc
)
1230 htab
->iplt
= bfd_get_section_by_name (abfd
, ".iplt");
1231 htab
->irelplt
= bfd_get_section_by_name (abfd
,
1233 htab
->igotplt
= bfd_get_section_by_name (abfd
,
1244 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1245 it here if it is defined in a non-shared object. */
1246 if (h
->type
== STT_GNU_IFUNC
1249 /* It is referenced by a non-shared object. */
1252 /* STT_GNU_IFUNC symbol must go through PLT. */
1253 h
->plt
.refcount
+= 1;
1255 /* STT_GNU_IFUNC needs dynamic sections. */
1256 if (htab
->elf
.dynobj
== NULL
)
1257 htab
->elf
.dynobj
= abfd
;
1262 (*_bfd_error_handler
)
1263 (_("%B: relocation %s against STT_GNU_IFUNC "
1264 "symbol `%s' isn't handled by %s"), abfd
,
1265 x86_64_elf_howto_table
[r_type
].name
,
1266 h
!= NULL
? h
->root
.root
.string
: "a local symbol",
1268 bfd_set_error (bfd_error_bad_value
);
1273 h
->pointer_equality_needed
= 1;
1276 struct elf64_x86_64_dyn_relocs
*p
;
1277 struct elf64_x86_64_dyn_relocs
**head
;
1279 /* We must copy these reloc types into the output
1280 file. Create a reloc section in dynobj and
1281 make room for this reloc. */
1284 if (htab
->elf
.dynobj
== NULL
)
1285 htab
->elf
.dynobj
= abfd
;
1287 sreloc
= _bfd_elf_make_dynamic_reloc_section
1288 (sec
, htab
->elf
.dynobj
, 3, abfd
, TRUE
);
1294 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1296 if (p
== NULL
|| p
->sec
!= sec
)
1298 bfd_size_type amt
= sizeof *p
;
1300 p
= ((struct elf64_x86_64_dyn_relocs
*)
1301 bfd_alloc (htab
->elf
.dynobj
, amt
));
1319 if (r_type
!= R_X86_64_PC32
1320 && r_type
!= R_X86_64_PC64
)
1321 h
->pointer_equality_needed
= 1;
1324 case R_X86_64_PLT32
:
1327 case R_X86_64_GOTPCREL
:
1328 case R_X86_64_GOTPCREL64
:
1329 h
->got
.refcount
+= 1;
1330 if (htab
->sgot
== NULL
1331 && !elf64_x86_64_create_got_section (htab
->elf
.dynobj
,
1341 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1342 symtab_hdr
, sym_hashes
,
1343 &r_type
, GOT_UNKNOWN
,
1349 case R_X86_64_TLSLD
:
1350 htab
->tls_ld_got
.refcount
+= 1;
1353 case R_X86_64_TPOFF32
:
1356 (*_bfd_error_handler
)
1357 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1359 x86_64_elf_howto_table
[r_type
].name
,
1360 (h
) ? h
->root
.root
.string
: "a local symbol");
1361 bfd_set_error (bfd_error_bad_value
);
1366 case R_X86_64_GOTTPOFF
:
1368 info
->flags
|= DF_STATIC_TLS
;
1371 case R_X86_64_GOT32
:
1372 case R_X86_64_GOTPCREL
:
1373 case R_X86_64_TLSGD
:
1374 case R_X86_64_GOT64
:
1375 case R_X86_64_GOTPCREL64
:
1376 case R_X86_64_GOTPLT64
:
1377 case R_X86_64_GOTPC32_TLSDESC
:
1378 case R_X86_64_TLSDESC_CALL
:
1379 /* This symbol requires a global offset table entry. */
1381 int tls_type
, old_tls_type
;
1385 default: tls_type
= GOT_NORMAL
; break;
1386 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1387 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1388 case R_X86_64_GOTPC32_TLSDESC
:
1389 case R_X86_64_TLSDESC_CALL
:
1390 tls_type
= GOT_TLS_GDESC
; break;
1395 if (r_type
== R_X86_64_GOTPLT64
)
1397 /* This relocation indicates that we also need
1398 a PLT entry, as this is a function. We don't need
1399 a PLT entry for local symbols. */
1401 h
->plt
.refcount
+= 1;
1403 h
->got
.refcount
+= 1;
1404 old_tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
1408 bfd_signed_vma
*local_got_refcounts
;
1410 /* This is a global offset table entry for a local symbol. */
1411 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1412 if (local_got_refcounts
== NULL
)
1416 size
= symtab_hdr
->sh_info
;
1417 size
*= sizeof (bfd_signed_vma
)
1418 + sizeof (bfd_vma
) + sizeof (char);
1419 local_got_refcounts
= ((bfd_signed_vma
*)
1420 bfd_zalloc (abfd
, size
));
1421 if (local_got_refcounts
== NULL
)
1423 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1424 elf64_x86_64_local_tlsdesc_gotent (abfd
)
1425 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1426 elf64_x86_64_local_got_tls_type (abfd
)
1427 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1429 local_got_refcounts
[r_symndx
] += 1;
1431 = elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1434 /* If a TLS symbol is accessed using IE at least once,
1435 there is no point to use dynamic model for it. */
1436 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1437 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1438 || tls_type
!= GOT_TLS_IE
))
1440 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1441 tls_type
= old_tls_type
;
1442 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1443 && GOT_TLS_GD_ANY_P (tls_type
))
1444 tls_type
|= old_tls_type
;
1447 (*_bfd_error_handler
)
1448 (_("%B: '%s' accessed both as normal and thread local symbol"),
1449 abfd
, h
? h
->root
.root
.string
: "<local>");
1454 if (old_tls_type
!= tls_type
)
1457 elf64_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1459 elf64_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1464 case R_X86_64_GOTOFF64
:
1465 case R_X86_64_GOTPC32
:
1466 case R_X86_64_GOTPC64
:
1468 if (htab
->sgot
== NULL
)
1470 if (htab
->elf
.dynobj
== NULL
)
1471 htab
->elf
.dynobj
= abfd
;
1472 if (!elf64_x86_64_create_got_section (htab
->elf
.dynobj
,
1478 case R_X86_64_PLT32
:
1479 /* This symbol requires a procedure linkage table entry. We
1480 actually build the entry in adjust_dynamic_symbol,
1481 because this might be a case of linking PIC code which is
1482 never referenced by a dynamic object, in which case we
1483 don't need to generate a procedure linkage table entry
1486 /* If this is a local symbol, we resolve it directly without
1487 creating a procedure linkage table entry. */
1492 h
->plt
.refcount
+= 1;
1495 case R_X86_64_PLTOFF64
:
1496 /* This tries to form the 'address' of a function relative
1497 to GOT. For global symbols we need a PLT entry. */
1501 h
->plt
.refcount
+= 1;
1509 /* Let's help debug shared library creation. These relocs
1510 cannot be used in shared libs. Don't error out for
1511 sections we don't care about, such as debug sections or
1512 non-constant sections. */
1514 && (sec
->flags
& SEC_ALLOC
) != 0
1515 && (sec
->flags
& SEC_READONLY
) != 0)
1517 (*_bfd_error_handler
)
1518 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1520 x86_64_elf_howto_table
[r_type
].name
,
1521 (h
) ? h
->root
.root
.string
: "a local symbol");
1522 bfd_set_error (bfd_error_bad_value
);
1532 if (h
!= NULL
&& info
->executable
)
1534 /* If this reloc is in a read-only section, we might
1535 need a copy reloc. We can't check reliably at this
1536 stage whether the section is read-only, as input
1537 sections have not yet been mapped to output sections.
1538 Tentatively set the flag for now, and correct in
1539 adjust_dynamic_symbol. */
1542 /* We may need a .plt entry if the function this reloc
1543 refers to is in a shared lib. */
1544 h
->plt
.refcount
+= 1;
1545 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1546 h
->pointer_equality_needed
= 1;
1549 /* If we are creating a shared library, and this is a reloc
1550 against a global symbol, or a non PC relative reloc
1551 against a local symbol, then we need to copy the reloc
1552 into the shared library. However, if we are linking with
1553 -Bsymbolic, we do not need to copy a reloc against a
1554 global symbol which is defined in an object we are
1555 including in the link (i.e., DEF_REGULAR is set). At
1556 this point we have not seen all the input files, so it is
1557 possible that DEF_REGULAR is not set now but will be set
1558 later (it is never cleared). In case of a weak definition,
1559 DEF_REGULAR may be cleared later by a strong definition in
1560 a shared library. We account for that possibility below by
1561 storing information in the relocs_copied field of the hash
1562 table entry. A similar situation occurs when creating
1563 shared libraries and symbol visibility changes render the
1566 If on the other hand, we are creating an executable, we
1567 may need to keep relocations for symbols satisfied by a
1568 dynamic library if we manage to avoid copy relocs for the
1571 && (sec
->flags
& SEC_ALLOC
) != 0
1572 && (! IS_X86_64_PCREL_TYPE (r_type
)
1574 && (! SYMBOLIC_BIND (info
, h
)
1575 || h
->root
.type
== bfd_link_hash_defweak
1576 || !h
->def_regular
))))
1577 || (ELIMINATE_COPY_RELOCS
1579 && (sec
->flags
& SEC_ALLOC
) != 0
1581 && (h
->root
.type
== bfd_link_hash_defweak
1582 || !h
->def_regular
)))
1584 struct elf64_x86_64_dyn_relocs
*p
;
1585 struct elf64_x86_64_dyn_relocs
**head
;
1587 /* We must copy these reloc types into the output file.
1588 Create a reloc section in dynobj and make room for
1592 if (htab
->elf
.dynobj
== NULL
)
1593 htab
->elf
.dynobj
= abfd
;
1595 sreloc
= _bfd_elf_make_dynamic_reloc_section
1596 (sec
, htab
->elf
.dynobj
, 3, abfd
, /*rela?*/ TRUE
);
1602 /* If this is a global symbol, we count the number of
1603 relocations we need for this symbol. */
1606 head
= &((struct elf64_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1611 /* Track dynamic relocs needed for local syms too.
1612 We really need local syms available to do this
1616 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1621 /* Beware of type punned pointers vs strict aliasing
1623 vpp
= &(elf_section_data (s
)->local_dynrel
);
1624 head
= (struct elf64_x86_64_dyn_relocs
**)vpp
;
1628 if (p
== NULL
|| p
->sec
!= sec
)
1630 bfd_size_type amt
= sizeof *p
;
1632 p
= ((struct elf64_x86_64_dyn_relocs
*)
1633 bfd_alloc (htab
->elf
.dynobj
, amt
));
1644 if (IS_X86_64_PCREL_TYPE (r_type
))
1649 /* This relocation describes the C++ object vtable hierarchy.
1650 Reconstruct it for later use during GC. */
1651 case R_X86_64_GNU_VTINHERIT
:
1652 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1656 /* This relocation describes which C++ vtable entries are actually
1657 used. Record for later use during GC. */
1658 case R_X86_64_GNU_VTENTRY
:
1659 BFD_ASSERT (h
!= NULL
);
1661 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1673 /* Return the section that should be marked against GC for a given
1677 elf64_x86_64_gc_mark_hook (asection
*sec
,
1678 struct bfd_link_info
*info
,
1679 Elf_Internal_Rela
*rel
,
1680 struct elf_link_hash_entry
*h
,
1681 Elf_Internal_Sym
*sym
)
1684 switch (ELF64_R_TYPE (rel
->r_info
))
1686 case R_X86_64_GNU_VTINHERIT
:
1687 case R_X86_64_GNU_VTENTRY
:
1691 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1694 /* Update the got entry reference counts for the section being removed. */
1697 elf64_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1699 const Elf_Internal_Rela
*relocs
)
1701 Elf_Internal_Shdr
*symtab_hdr
;
1702 struct elf_link_hash_entry
**sym_hashes
;
1703 bfd_signed_vma
*local_got_refcounts
;
1704 const Elf_Internal_Rela
*rel
, *relend
;
1706 if (info
->relocatable
)
1709 elf_section_data (sec
)->local_dynrel
= NULL
;
1711 symtab_hdr
= &elf_symtab_hdr (abfd
);
1712 sym_hashes
= elf_sym_hashes (abfd
);
1713 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1715 relend
= relocs
+ sec
->reloc_count
;
1716 for (rel
= relocs
; rel
< relend
; rel
++)
1718 unsigned long r_symndx
;
1719 unsigned int r_type
;
1720 struct elf_link_hash_entry
*h
= NULL
;
1722 r_symndx
= ELF64_R_SYM (rel
->r_info
);
1723 if (r_symndx
>= symtab_hdr
->sh_info
)
1725 struct elf64_x86_64_link_hash_entry
*eh
;
1726 struct elf64_x86_64_dyn_relocs
**pp
;
1727 struct elf64_x86_64_dyn_relocs
*p
;
1729 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1730 while (h
->root
.type
== bfd_link_hash_indirect
1731 || h
->root
.type
== bfd_link_hash_warning
)
1732 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1733 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1735 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1738 /* Everything must go for SEC. */
1744 r_type
= ELF64_R_TYPE (rel
->r_info
);
1745 if (! elf64_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1746 symtab_hdr
, sym_hashes
,
1747 &r_type
, GOT_UNKNOWN
,
1753 case R_X86_64_TLSLD
:
1754 if (elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
> 0)
1755 elf64_x86_64_hash_table (info
)->tls_ld_got
.refcount
-= 1;
1758 case R_X86_64_TLSGD
:
1759 case R_X86_64_GOTPC32_TLSDESC
:
1760 case R_X86_64_TLSDESC_CALL
:
1761 case R_X86_64_GOTTPOFF
:
1762 case R_X86_64_GOT32
:
1763 case R_X86_64_GOTPCREL
:
1764 case R_X86_64_GOT64
:
1765 case R_X86_64_GOTPCREL64
:
1766 case R_X86_64_GOTPLT64
:
1769 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1770 h
->plt
.refcount
-= 1;
1771 if (h
->got
.refcount
> 0)
1772 h
->got
.refcount
-= 1;
1774 else if (local_got_refcounts
!= NULL
)
1776 if (local_got_refcounts
[r_symndx
] > 0)
1777 local_got_refcounts
[r_symndx
] -= 1;
1794 case R_X86_64_PLT32
:
1795 case R_X86_64_PLTOFF64
:
1798 if (h
->plt
.refcount
> 0)
1799 h
->plt
.refcount
-= 1;
1811 /* Adjust a symbol defined by a dynamic object and referenced by a
1812 regular object. The current definition is in some section of the
1813 dynamic object, but we're not including those sections. We have to
1814 change the definition to something the rest of the link can
1818 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1819 struct elf_link_hash_entry
*h
)
1821 struct elf64_x86_64_link_hash_table
*htab
;
1824 /* STT_GNU_IFUNC symbol must go through PLT. */
1825 if (h
->type
== STT_GNU_IFUNC
)
1827 if (h
->plt
.refcount
<= 0)
1829 h
->plt
.offset
= (bfd_vma
) -1;
1835 /* If this is a function, put it in the procedure linkage table. We
1836 will fill in the contents of the procedure linkage table later,
1837 when we know the address of the .got section. */
1838 if (h
->type
== STT_FUNC
1841 if (h
->plt
.refcount
<= 0
1842 || SYMBOL_CALLS_LOCAL (info
, h
)
1843 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1844 && h
->root
.type
== bfd_link_hash_undefweak
))
1846 /* This case can occur if we saw a PLT32 reloc in an input
1847 file, but the symbol was never referred to by a dynamic
1848 object, or if all references were garbage collected. In
1849 such a case, we don't actually need to build a procedure
1850 linkage table, and we can just do a PC32 reloc instead. */
1851 h
->plt
.offset
= (bfd_vma
) -1;
1858 /* It's possible that we incorrectly decided a .plt reloc was
1859 needed for an R_X86_64_PC32 reloc to a non-function sym in
1860 check_relocs. We can't decide accurately between function and
1861 non-function syms in check-relocs; Objects loaded later in
1862 the link may change h->type. So fix it now. */
1863 h
->plt
.offset
= (bfd_vma
) -1;
1865 /* If this is a weak symbol, and there is a real definition, the
1866 processor independent code will have arranged for us to see the
1867 real definition first, and we can just use the same value. */
1868 if (h
->u
.weakdef
!= NULL
)
1870 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1871 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1872 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1873 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1874 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1875 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1879 /* This is a reference to a symbol defined by a dynamic object which
1880 is not a function. */
1882 /* If we are creating a shared library, we must presume that the
1883 only references to the symbol are via the global offset table.
1884 For such cases we need not do anything here; the relocations will
1885 be handled correctly by relocate_section. */
1889 /* If there are no references to this symbol that do not use the
1890 GOT, we don't need to generate a copy reloc. */
1891 if (!h
->non_got_ref
)
1894 /* If -z nocopyreloc was given, we won't generate them either. */
1895 if (info
->nocopyreloc
)
1901 if (ELIMINATE_COPY_RELOCS
)
1903 struct elf64_x86_64_link_hash_entry
* eh
;
1904 struct elf64_x86_64_dyn_relocs
*p
;
1906 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1907 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1909 s
= p
->sec
->output_section
;
1910 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1914 /* If we didn't find any dynamic relocs in read-only sections, then
1915 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1925 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1926 h
->root
.root
.string
);
1930 /* We must allocate the symbol in our .dynbss section, which will
1931 become part of the .bss section of the executable. There will be
1932 an entry for this symbol in the .dynsym section. The dynamic
1933 object will contain position independent code, so all references
1934 from the dynamic object to this symbol will go through the global
1935 offset table. The dynamic linker will use the .dynsym entry to
1936 determine the address it must put in the global offset table, so
1937 both the dynamic object and the regular object will refer to the
1938 same memory location for the variable. */
1940 htab
= elf64_x86_64_hash_table (info
);
1942 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1943 to copy the initial value out of the dynamic object and into the
1944 runtime process image. */
1945 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1947 htab
->srelbss
->size
+= sizeof (Elf64_External_Rela
);
1953 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1956 /* Allocate space in .plt, .got and associated reloc sections for
1960 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1962 struct bfd_link_info
*info
;
1963 struct elf64_x86_64_link_hash_table
*htab
;
1964 struct elf64_x86_64_link_hash_entry
*eh
;
1965 struct elf64_x86_64_dyn_relocs
*p
;
1967 if (h
->root
.type
== bfd_link_hash_indirect
)
1970 if (h
->root
.type
== bfd_link_hash_warning
)
1971 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1972 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
1974 info
= (struct bfd_link_info
*) inf
;
1975 htab
= elf64_x86_64_hash_table (info
);
1977 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1978 here if it is defined and referenced in a non-shared object. */
1979 if (h
->type
== STT_GNU_IFUNC
1982 asection
*plt
, *gotplt
, *relplt
;
1984 /* Return and discard space for dynamic relocations against it if
1985 it is never referenced in a non-shared object. */
1986 if (!h
->ref_regular
)
1988 if (h
->plt
.refcount
> 0
1989 || h
->got
.refcount
> 0)
1991 h
->got
.offset
= (bfd_vma
) -1;
1992 eh
->dyn_relocs
= NULL
;
1996 /* When building a static executable, use .iplt, .igot.plt and
1997 .rela.iplt sections for STT_GNU_IFUNC symbols. */
1998 if (htab
->splt
!= NULL
)
2001 gotplt
= htab
->sgotplt
;
2002 relplt
= htab
->srelplt
;
2004 /* If this is the first .plt entry, make room for the special
2007 plt
->size
+= PLT_ENTRY_SIZE
;
2012 gotplt
= htab
->igotplt
;
2013 relplt
= htab
->irelplt
;
2016 /* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
2017 the original value for R_X86_64_IRELATIVE. */
2018 h
->plt
.offset
= plt
->size
;
2020 /* Make room for this entry in the .plt/.iplt section. */
2021 plt
->size
+= PLT_ENTRY_SIZE
;
2023 /* We also need to make an entry in the .got.plt/.got.iplt
2024 section, which will be placed in the .got section by the
2026 gotplt
->size
+= GOT_ENTRY_SIZE
;
2028 /* We also need to make an entry in the .rela.plt/.rela.iplt
2030 relplt
->size
+= sizeof (Elf64_External_Rela
);
2031 relplt
->reloc_count
++;
2033 /* We need dynamic relocation for STT_GNU_IFUNC symbol only
2034 when there is a non-GOT reference in a shared object. */
2037 eh
->dyn_relocs
= NULL
;
2039 /* Finally, allocate space. */
2040 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2041 htab
->irelifunc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2043 /* For STT_GNU_IFUNC symbol, .got.plt has the real function
2044 addres and .got has the PLT entry adddress. We will load
2045 the GOT entry with the PLT entry in finish_dynamic_symbol if
2046 it is used. For branch, it uses .got.plt. For symbol value,
2047 1. Use .got.plt in a shared object if it is forced local or
2049 2. Use .got.plt in a non-shared object if pointer equality
2051 3. Use .got.plt if .got isn't used.
2052 4. Otherwise use .got so that it can be shared among different
2053 objects at run-time.
2054 We only need to relocate .got entry in shared object. */
2056 && (h
->dynindx
== -1
2057 || h
->forced_local
))
2059 && !h
->pointer_equality_needed
)
2060 || htab
->sgot
== NULL
)
2063 h
->got
.offset
= (bfd_vma
) -1;
2067 h
->got
.offset
= htab
->sgot
->size
;
2068 htab
->sgot
->size
+= GOT_ENTRY_SIZE
;
2070 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2075 else if (htab
->elf
.dynamic_sections_created
2076 && h
->plt
.refcount
> 0)
2078 /* Make sure this symbol is output as a dynamic symbol.
2079 Undefined weak syms won't yet be marked as dynamic. */
2080 if (h
->dynindx
== -1
2081 && !h
->forced_local
)
2083 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2088 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2090 asection
*s
= htab
->splt
;
2092 /* If this is the first .plt entry, make room for the special
2095 s
->size
+= PLT_ENTRY_SIZE
;
2097 h
->plt
.offset
= s
->size
;
2099 /* If this symbol is not defined in a regular file, and we are
2100 not generating a shared library, then set the symbol to this
2101 location in the .plt. This is required to make function
2102 pointers compare as equal between the normal executable and
2103 the shared library. */
2107 h
->root
.u
.def
.section
= s
;
2108 h
->root
.u
.def
.value
= h
->plt
.offset
;
2111 /* Make room for this entry. */
2112 s
->size
+= PLT_ENTRY_SIZE
;
2114 /* We also need to make an entry in the .got.plt section, which
2115 will be placed in the .got section by the linker script. */
2116 htab
->sgotplt
->size
+= GOT_ENTRY_SIZE
;
2118 /* We also need to make an entry in the .rela.plt section. */
2119 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
2120 htab
->srelplt
->reloc_count
++;
2124 h
->plt
.offset
= (bfd_vma
) -1;
2130 h
->plt
.offset
= (bfd_vma
) -1;
2134 eh
->tlsdesc_got
= (bfd_vma
) -1;
2136 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2137 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2138 if (h
->got
.refcount
> 0
2141 && elf64_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2143 h
->got
.offset
= (bfd_vma
) -1;
2145 else if (h
->got
.refcount
> 0)
2149 int tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
2151 /* Make sure this symbol is output as a dynamic symbol.
2152 Undefined weak syms won't yet be marked as dynamic. */
2153 if (h
->dynindx
== -1
2154 && !h
->forced_local
)
2156 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2160 if (GOT_TLS_GDESC_P (tls_type
))
2162 eh
->tlsdesc_got
= htab
->sgotplt
->size
2163 - elf64_x86_64_compute_jump_table_size (htab
);
2164 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2165 h
->got
.offset
= (bfd_vma
) -2;
2167 if (! GOT_TLS_GDESC_P (tls_type
)
2168 || GOT_TLS_GD_P (tls_type
))
2171 h
->got
.offset
= s
->size
;
2172 s
->size
+= GOT_ENTRY_SIZE
;
2173 if (GOT_TLS_GD_P (tls_type
))
2174 s
->size
+= GOT_ENTRY_SIZE
;
2176 dyn
= htab
->elf
.dynamic_sections_created
;
2177 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2179 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2180 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2181 || tls_type
== GOT_TLS_IE
)
2182 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2183 else if (GOT_TLS_GD_P (tls_type
))
2184 htab
->srelgot
->size
+= 2 * sizeof (Elf64_External_Rela
);
2185 else if (! GOT_TLS_GDESC_P (tls_type
)
2186 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2187 || h
->root
.type
!= bfd_link_hash_undefweak
)
2189 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2190 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2191 if (GOT_TLS_GDESC_P (tls_type
))
2193 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
2194 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2198 h
->got
.offset
= (bfd_vma
) -1;
2200 if (eh
->dyn_relocs
== NULL
)
2203 /* In the shared -Bsymbolic case, discard space allocated for
2204 dynamic pc-relative relocs against symbols which turn out to be
2205 defined in regular objects. For the normal shared case, discard
2206 space for pc-relative relocs that have become local due to symbol
2207 visibility changes. */
2211 /* Relocs that use pc_count are those that appear on a call
2212 insn, or certain REL relocs that can generated via assembly.
2213 We want calls to protected symbols to resolve directly to the
2214 function rather than going via the plt. If people want
2215 function pointer comparisons to work as expected then they
2216 should avoid writing weird assembly. */
2217 if (SYMBOL_CALLS_LOCAL (info
, h
))
2219 struct elf64_x86_64_dyn_relocs
**pp
;
2221 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2223 p
->count
-= p
->pc_count
;
2232 /* Also discard relocs on undefined weak syms with non-default
2234 if (eh
->dyn_relocs
!= NULL
2235 && h
->root
.type
== bfd_link_hash_undefweak
)
2237 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2238 eh
->dyn_relocs
= NULL
;
2240 /* Make sure undefined weak symbols are output as a dynamic
2242 else if (h
->dynindx
== -1
2243 && ! h
->forced_local
2244 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2249 else if (ELIMINATE_COPY_RELOCS
)
2251 /* For the non-shared case, discard space for relocs against
2252 symbols which turn out to need copy relocs or are not
2258 || (htab
->elf
.dynamic_sections_created
2259 && (h
->root
.type
== bfd_link_hash_undefweak
2260 || h
->root
.type
== bfd_link_hash_undefined
))))
2262 /* Make sure this symbol is output as a dynamic symbol.
2263 Undefined weak syms won't yet be marked as dynamic. */
2264 if (h
->dynindx
== -1
2265 && ! h
->forced_local
2266 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2269 /* If that succeeded, we know we'll be keeping all the
2271 if (h
->dynindx
!= -1)
2275 eh
->dyn_relocs
= NULL
;
2280 /* Finally, allocate space. */
2281 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2285 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2287 BFD_ASSERT (sreloc
!= NULL
);
2289 sreloc
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2295 /* Allocate space in .plt, .got and associated reloc sections for
2296 local dynamic relocs. */
2299 elf64_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2301 struct elf_link_hash_entry
*h
2302 = (struct elf_link_hash_entry
*) *slot
;
2304 if (h
->type
!= STT_GNU_IFUNC
2308 || h
->root
.type
!= bfd_link_hash_defined
)
2311 return elf64_x86_64_allocate_dynrelocs (h
, inf
);
2314 /* Find any dynamic relocs that apply to read-only sections. */
2317 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2319 struct elf64_x86_64_link_hash_entry
*eh
;
2320 struct elf64_x86_64_dyn_relocs
*p
;
2322 if (h
->root
.type
== bfd_link_hash_warning
)
2323 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2325 eh
= (struct elf64_x86_64_link_hash_entry
*) h
;
2326 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2328 asection
*s
= p
->sec
->output_section
;
2330 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2332 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2334 info
->flags
|= DF_TEXTREL
;
2336 /* Not an error, just cut short the traversal. */
2343 /* Set the sizes of the dynamic sections. */
2346 elf64_x86_64_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2347 struct bfd_link_info
*info
)
2349 struct elf64_x86_64_link_hash_table
*htab
;
2355 htab
= elf64_x86_64_hash_table (info
);
2356 dynobj
= htab
->elf
.dynobj
;
2360 if (htab
->elf
.dynamic_sections_created
)
2362 /* Set the contents of the .interp section to the interpreter. */
2363 if (info
->executable
)
2365 s
= bfd_get_section_by_name (dynobj
, ".interp");
2368 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
2369 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
2373 /* Set up .got offsets for local syms, and space for local dynamic
2375 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2377 bfd_signed_vma
*local_got
;
2378 bfd_signed_vma
*end_local_got
;
2379 char *local_tls_type
;
2380 bfd_vma
*local_tlsdesc_gotent
;
2381 bfd_size_type locsymcount
;
2382 Elf_Internal_Shdr
*symtab_hdr
;
2385 if (! is_x86_64_elf (ibfd
))
2388 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2390 struct elf64_x86_64_dyn_relocs
*p
;
2392 for (p
= (struct elf64_x86_64_dyn_relocs
*)
2393 (elf_section_data (s
)->local_dynrel
);
2397 if (!bfd_is_abs_section (p
->sec
)
2398 && bfd_is_abs_section (p
->sec
->output_section
))
2400 /* Input section has been discarded, either because
2401 it is a copy of a linkonce section or due to
2402 linker script /DISCARD/, so we'll be discarding
2405 else if (p
->count
!= 0)
2407 srel
= elf_section_data (p
->sec
)->sreloc
;
2408 srel
->size
+= p
->count
* sizeof (Elf64_External_Rela
);
2409 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2410 info
->flags
|= DF_TEXTREL
;
2415 local_got
= elf_local_got_refcounts (ibfd
);
2419 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2420 locsymcount
= symtab_hdr
->sh_info
;
2421 end_local_got
= local_got
+ locsymcount
;
2422 local_tls_type
= elf64_x86_64_local_got_tls_type (ibfd
);
2423 local_tlsdesc_gotent
= elf64_x86_64_local_tlsdesc_gotent (ibfd
);
2425 srel
= htab
->srelgot
;
2426 for (; local_got
< end_local_got
;
2427 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2429 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2432 if (GOT_TLS_GDESC_P (*local_tls_type
))
2434 *local_tlsdesc_gotent
= htab
->sgotplt
->size
2435 - elf64_x86_64_compute_jump_table_size (htab
);
2436 htab
->sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2437 *local_got
= (bfd_vma
) -2;
2439 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2440 || GOT_TLS_GD_P (*local_tls_type
))
2442 *local_got
= s
->size
;
2443 s
->size
+= GOT_ENTRY_SIZE
;
2444 if (GOT_TLS_GD_P (*local_tls_type
))
2445 s
->size
+= GOT_ENTRY_SIZE
;
2448 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2449 || *local_tls_type
== GOT_TLS_IE
)
2451 if (GOT_TLS_GDESC_P (*local_tls_type
))
2453 htab
->srelplt
->size
+= sizeof (Elf64_External_Rela
);
2454 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2456 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2457 || GOT_TLS_GD_P (*local_tls_type
))
2458 srel
->size
+= sizeof (Elf64_External_Rela
);
2462 *local_got
= (bfd_vma
) -1;
2466 if (htab
->tls_ld_got
.refcount
> 0)
2468 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2470 htab
->tls_ld_got
.offset
= htab
->sgot
->size
;
2471 htab
->sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2472 htab
->srelgot
->size
+= sizeof (Elf64_External_Rela
);
2475 htab
->tls_ld_got
.offset
= -1;
2477 /* Allocate global sym .plt and .got entries, and space for global
2478 sym dynamic relocs. */
2479 elf_link_hash_traverse (&htab
->elf
, elf64_x86_64_allocate_dynrelocs
,
2482 /* Allocate .plt and .got entries, and space for local symbols. */
2483 htab_traverse (htab
->loc_hash_table
,
2484 elf64_x86_64_allocate_local_dynrelocs
,
2487 /* For every jump slot reserved in the sgotplt, reloc_count is
2488 incremented. However, when we reserve space for TLS descriptors,
2489 it's not incremented, so in order to compute the space reserved
2490 for them, it suffices to multiply the reloc count by the jump
2493 htab
->sgotplt_jump_table_size
2494 = elf64_x86_64_compute_jump_table_size (htab
);
2496 if (htab
->tlsdesc_plt
)
2498 /* If we're not using lazy TLS relocations, don't generate the
2499 PLT and GOT entries they require. */
2500 if ((info
->flags
& DF_BIND_NOW
))
2501 htab
->tlsdesc_plt
= 0;
2504 htab
->tlsdesc_got
= htab
->sgot
->size
;
2505 htab
->sgot
->size
+= GOT_ENTRY_SIZE
;
2506 /* Reserve room for the initial entry.
2507 FIXME: we could probably do away with it in this case. */
2508 if (htab
->splt
->size
== 0)
2509 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
2510 htab
->tlsdesc_plt
= htab
->splt
->size
;
2511 htab
->splt
->size
+= PLT_ENTRY_SIZE
;
2515 /* We now have determined the sizes of the various dynamic sections.
2516 Allocate memory for them. */
2518 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2520 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2525 || s
== htab
->sgotplt
2527 || s
== htab
->igotplt
2528 || s
== htab
->sdynbss
)
2530 /* Strip this section if we don't need it; see the
2533 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2535 if (s
->size
!= 0 && s
!= htab
->srelplt
)
2538 /* We use the reloc_count field as a counter if we need
2539 to copy relocs into the output file. */
2540 if (s
!= htab
->srelplt
)
2545 /* It's not one of our sections, so don't allocate space. */
2551 /* If we don't need this section, strip it from the
2552 output file. This is mostly to handle .rela.bss and
2553 .rela.plt. We must create both sections in
2554 create_dynamic_sections, because they must be created
2555 before the linker maps input sections to output
2556 sections. The linker does that before
2557 adjust_dynamic_symbol is called, and it is that
2558 function which decides whether anything needs to go
2559 into these sections. */
2561 s
->flags
|= SEC_EXCLUDE
;
2565 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2568 /* Allocate memory for the section contents. We use bfd_zalloc
2569 here in case unused entries are not reclaimed before the
2570 section's contents are written out. This should not happen,
2571 but this way if it does, we get a R_X86_64_NONE reloc instead
2573 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2574 if (s
->contents
== NULL
)
2578 if (htab
->elf
.dynamic_sections_created
)
2580 /* Add some entries to the .dynamic section. We fill in the
2581 values later, in elf64_x86_64_finish_dynamic_sections, but we
2582 must add the entries now so that we get the correct size for
2583 the .dynamic section. The DT_DEBUG entry is filled in by the
2584 dynamic linker and used by the debugger. */
2585 #define add_dynamic_entry(TAG, VAL) \
2586 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2588 if (info
->executable
)
2590 if (!add_dynamic_entry (DT_DEBUG
, 0))
2594 if (htab
->splt
->size
!= 0)
2596 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2597 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2598 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2599 || !add_dynamic_entry (DT_JMPREL
, 0))
2602 if (htab
->tlsdesc_plt
2603 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2604 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2610 if (!add_dynamic_entry (DT_RELA
, 0)
2611 || !add_dynamic_entry (DT_RELASZ
, 0)
2612 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf64_External_Rela
)))
2615 /* If any dynamic relocs apply to a read-only section,
2616 then we need a DT_TEXTREL entry. */
2617 if ((info
->flags
& DF_TEXTREL
) == 0)
2618 elf_link_hash_traverse (&htab
->elf
,
2619 elf64_x86_64_readonly_dynrelocs
,
2622 if ((info
->flags
& DF_TEXTREL
) != 0)
2624 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2629 #undef add_dynamic_entry
2635 elf64_x86_64_always_size_sections (bfd
*output_bfd
,
2636 struct bfd_link_info
*info
)
2638 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2642 struct elf_link_hash_entry
*tlsbase
;
2644 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2645 "_TLS_MODULE_BASE_",
2646 FALSE
, FALSE
, FALSE
);
2648 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2650 struct bfd_link_hash_entry
*bh
= NULL
;
2651 const struct elf_backend_data
*bed
2652 = get_elf_backend_data (output_bfd
);
2654 if (!(_bfd_generic_link_add_one_symbol
2655 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2656 tls_sec
, 0, NULL
, FALSE
,
2657 bed
->collect
, &bh
)))
2660 elf64_x86_64_hash_table (info
)->tls_module_base
= bh
;
2662 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2663 tlsbase
->def_regular
= 1;
2664 tlsbase
->other
= STV_HIDDEN
;
2665 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2672 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2673 executables. Rather than setting it to the beginning of the TLS
2674 section, we have to set it to the end. This function may be called
2675 multiple times, it is idempotent. */
2678 elf64_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2680 struct bfd_link_hash_entry
*base
;
2682 if (!info
->executable
)
2685 base
= elf64_x86_64_hash_table (info
)->tls_module_base
;
2690 base
->u
.def
.value
= elf_hash_table (info
)->tls_size
;
2693 /* Return the base VMA address which should be subtracted from real addresses
2694 when resolving @dtpoff relocation.
2695 This is PT_TLS segment p_vaddr. */
2698 elf64_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2700 /* If tls_sec is NULL, we should have signalled an error already. */
2701 if (elf_hash_table (info
)->tls_sec
== NULL
)
2703 return elf_hash_table (info
)->tls_sec
->vma
;
2706 /* Return the relocation value for @tpoff relocation
2707 if STT_TLS virtual address is ADDRESS. */
2710 elf64_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2712 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2714 /* If tls_segment is NULL, we should have signalled an error already. */
2715 if (htab
->tls_sec
== NULL
)
2717 return address
- htab
->tls_size
- htab
->tls_sec
->vma
;
2720 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2724 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2726 /* Opcode Instruction
2729 0x0f 0x8x conditional jump */
2731 && (contents
[offset
- 1] == 0xe8
2732 || contents
[offset
- 1] == 0xe9))
2734 && contents
[offset
- 2] == 0x0f
2735 && (contents
[offset
- 1] & 0xf0) == 0x80));
2738 /* Relocate an x86_64 ELF section. */
2741 elf64_x86_64_relocate_section (bfd
*output_bfd
, struct bfd_link_info
*info
,
2742 bfd
*input_bfd
, asection
*input_section
,
2743 bfd_byte
*contents
, Elf_Internal_Rela
*relocs
,
2744 Elf_Internal_Sym
*local_syms
,
2745 asection
**local_sections
)
2747 struct elf64_x86_64_link_hash_table
*htab
;
2748 Elf_Internal_Shdr
*symtab_hdr
;
2749 struct elf_link_hash_entry
**sym_hashes
;
2750 bfd_vma
*local_got_offsets
;
2751 bfd_vma
*local_tlsdesc_gotents
;
2752 Elf_Internal_Rela
*rel
;
2753 Elf_Internal_Rela
*relend
;
2755 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2757 htab
= elf64_x86_64_hash_table (info
);
2758 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2759 sym_hashes
= elf_sym_hashes (input_bfd
);
2760 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2761 local_tlsdesc_gotents
= elf64_x86_64_local_tlsdesc_gotent (input_bfd
);
2763 elf64_x86_64_set_tls_module_base (info
);
2766 relend
= relocs
+ input_section
->reloc_count
;
2767 for (; rel
< relend
; rel
++)
2769 unsigned int r_type
;
2770 reloc_howto_type
*howto
;
2771 unsigned long r_symndx
;
2772 struct elf_link_hash_entry
*h
;
2773 Elf_Internal_Sym
*sym
;
2775 bfd_vma off
, offplt
;
2777 bfd_boolean unresolved_reloc
;
2778 bfd_reloc_status_type r
;
2782 r_type
= ELF64_R_TYPE (rel
->r_info
);
2783 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2784 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2787 if (r_type
>= R_X86_64_max
)
2789 bfd_set_error (bfd_error_bad_value
);
2793 howto
= x86_64_elf_howto_table
+ r_type
;
2794 r_symndx
= ELF64_R_SYM (rel
->r_info
);
2798 unresolved_reloc
= FALSE
;
2799 if (r_symndx
< symtab_hdr
->sh_info
)
2801 sym
= local_syms
+ r_symndx
;
2802 sec
= local_sections
[r_symndx
];
2804 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2807 /* Relocate against local STT_GNU_IFUNC symbol. */
2808 if (ELF64_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2810 h
= elf64_x86_64_get_local_sym_hash (htab
, input_bfd
,
2815 /* Set STT_GNU_IFUNC symbol value. */
2816 h
->root
.u
.def
.value
= sym
->st_value
;
2817 h
->root
.u
.def
.section
= sec
;
2824 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2825 r_symndx
, symtab_hdr
, sym_hashes
,
2827 unresolved_reloc
, warned
);
2830 if (sec
!= NULL
&& elf_discarded_section (sec
))
2832 /* For relocs against symbols from removed linkonce sections,
2833 or sections discarded by a linker script, we just want the
2834 section contents zeroed. Avoid any special processing. */
2835 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2841 if (info
->relocatable
)
2844 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2845 it here if it is defined in a non-shared object. */
2847 && h
->type
== STT_GNU_IFUNC
2853 if ((input_section
->flags
& SEC_ALLOC
) == 0
2854 || h
->plt
.offset
== (bfd_vma
) -1)
2857 /* STT_GNU_IFUNC symbol must go through PLT. */
2858 plt
= htab
->splt
? htab
->splt
: htab
->iplt
;
2859 relocation
= (plt
->output_section
->vma
2860 + plt
->output_offset
+ h
->plt
.offset
);
2865 (*_bfd_error_handler
)
2866 (_("%B: relocation %s against STT_GNU_IFUNC "
2867 "symbol `%s' isn't handled by %s"), input_bfd
,
2868 x86_64_elf_howto_table
[r_type
].name
,
2869 h
->root
.root
.string
, __FUNCTION__
);
2870 bfd_set_error (bfd_error_bad_value
);
2879 if (rel
->r_addend
!= 0)
2881 (*_bfd_error_handler
)
2882 (_("%B: relocation %s against STT_GNU_IFUNC "
2883 "symbol `%s' has non-zero addend: %d"),
2884 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2885 h
->root
.root
.string
, rel
->r_addend
);
2886 bfd_set_error (bfd_error_bad_value
);
2890 /* Generate dynamic relcoation only when there is a
2891 non-GOF reference in a shared object. */
2892 if (info
->shared
&& h
->non_got_ref
)
2894 Elf_Internal_Rela outrel
;
2898 /* Need a dynamic relocation to get the real function
2900 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2904 if (outrel
.r_offset
== (bfd_vma
) -1
2905 || outrel
.r_offset
== (bfd_vma
) -2)
2908 outrel
.r_offset
+= (input_section
->output_section
->vma
2909 + input_section
->output_offset
);
2911 if (h
->dynindx
== -1
2914 /* This symbol is resolved locally. */
2915 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_IRELATIVE
);
2916 outrel
.r_addend
= (h
->root
.u
.def
.value
2917 + h
->root
.u
.def
.section
->output_section
->vma
2918 + h
->root
.u
.def
.section
->output_offset
);
2922 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
2923 outrel
.r_addend
= 0;
2926 sreloc
= htab
->irelifunc
;
2927 loc
= sreloc
->contents
;
2928 loc
+= (sreloc
->reloc_count
++
2929 * sizeof (Elf64_External_Rela
));
2930 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
2932 /* If this reloc is against an external symbol, we
2933 do not want to fiddle with the addend. Otherwise,
2934 we need to include the symbol value so that it
2935 becomes an addend for the dynamic reloc. For an
2936 internal symbol, we have updated addend. */
2943 case R_X86_64_PLT32
:
2946 case R_X86_64_GOTPCREL
:
2947 case R_X86_64_GOTPCREL64
:
2948 base_got
= htab
->sgot
;
2949 off
= h
->got
.offset
;
2951 if (base_got
== NULL
)
2954 if (off
== (bfd_vma
) -1)
2956 /* We can't use h->got.offset here to save state, or
2957 even just remember the offset, as finish_dynamic_symbol
2958 would use that as offset into .got. */
2960 if (htab
->splt
!= NULL
)
2962 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2963 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2964 base_got
= htab
->sgotplt
;
2968 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
2969 off
= plt_index
* GOT_ENTRY_SIZE
;
2970 base_got
= htab
->igotplt
;
2973 if (h
->dynindx
== -1
2977 /* This references the local defitionion. We must
2978 initialize this entry in the global offset table.
2979 Since the offset must always be a multiple of 8,
2980 we use the least significant bit to record
2981 whether we have initialized it already.
2983 When doing a dynamic link, we create a .rela.got
2984 relocation entry to initialize the value. This
2985 is done in the finish_dynamic_symbol routine. */
2990 bfd_put_64 (output_bfd
, relocation
,
2991 base_got
->contents
+ off
);
2992 /* Note that this is harmless for the GOTPLT64
2993 case, as -1 | 1 still is -1. */
2999 relocation
= (base_got
->output_section
->vma
3000 + base_got
->output_offset
+ off
);
3002 if (r_type
!= R_X86_64_GOTPCREL
3003 && r_type
!= R_X86_64_GOTPCREL64
)
3006 if (htab
->splt
!= NULL
)
3007 gotplt
= htab
->sgotplt
;
3009 gotplt
= htab
->igotplt
;
3010 relocation
-= (gotplt
->output_section
->vma
3011 - gotplt
->output_offset
);
3018 /* When generating a shared object, the relocations handled here are
3019 copied into the output file to be resolved at run time. */
3022 case R_X86_64_GOT32
:
3023 case R_X86_64_GOT64
:
3024 /* Relocation is to the entry for this symbol in the global
3026 case R_X86_64_GOTPCREL
:
3027 case R_X86_64_GOTPCREL64
:
3028 /* Use global offset table entry as symbol value. */
3029 case R_X86_64_GOTPLT64
:
3030 /* This is the same as GOT64 for relocation purposes, but
3031 indicates the existence of a PLT entry. The difficulty is,
3032 that we must calculate the GOT slot offset from the PLT
3033 offset, if this symbol got a PLT entry (it was global).
3034 Additionally if it's computed from the PLT entry, then that
3035 GOT offset is relative to .got.plt, not to .got. */
3036 base_got
= htab
->sgot
;
3038 if (htab
->sgot
== NULL
)
3045 off
= h
->got
.offset
;
3047 && h
->plt
.offset
!= (bfd_vma
)-1
3048 && off
== (bfd_vma
)-1)
3050 /* We can't use h->got.offset here to save
3051 state, or even just remember the offset, as
3052 finish_dynamic_symbol would use that as offset into
3054 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3055 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3056 base_got
= htab
->sgotplt
;
3059 dyn
= htab
->elf
.dynamic_sections_created
;
3061 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3063 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3064 || (ELF_ST_VISIBILITY (h
->other
)
3065 && h
->root
.type
== bfd_link_hash_undefweak
))
3067 /* This is actually a static link, or it is a -Bsymbolic
3068 link and the symbol is defined locally, or the symbol
3069 was forced to be local because of a version file. We
3070 must initialize this entry in the global offset table.
3071 Since the offset must always be a multiple of 8, we
3072 use the least significant bit to record whether we
3073 have initialized it already.
3075 When doing a dynamic link, we create a .rela.got
3076 relocation entry to initialize the value. This is
3077 done in the finish_dynamic_symbol routine. */
3082 bfd_put_64 (output_bfd
, relocation
,
3083 base_got
->contents
+ off
);
3084 /* Note that this is harmless for the GOTPLT64 case,
3085 as -1 | 1 still is -1. */
3090 unresolved_reloc
= FALSE
;
3094 if (local_got_offsets
== NULL
)
3097 off
= local_got_offsets
[r_symndx
];
3099 /* The offset must always be a multiple of 8. We use
3100 the least significant bit to record whether we have
3101 already generated the necessary reloc. */
3106 bfd_put_64 (output_bfd
, relocation
,
3107 base_got
->contents
+ off
);
3112 Elf_Internal_Rela outrel
;
3115 /* We need to generate a R_X86_64_RELATIVE reloc
3116 for the dynamic linker. */
3121 outrel
.r_offset
= (base_got
->output_section
->vma
3122 + base_got
->output_offset
3124 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3125 outrel
.r_addend
= relocation
;
3127 loc
+= s
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3128 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3131 local_got_offsets
[r_symndx
] |= 1;
3135 if (off
>= (bfd_vma
) -2)
3138 relocation
= base_got
->output_section
->vma
3139 + base_got
->output_offset
+ off
;
3140 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3141 relocation
-= htab
->sgotplt
->output_section
->vma
3142 - htab
->sgotplt
->output_offset
;
3146 case R_X86_64_GOTOFF64
:
3147 /* Relocation is relative to the start of the global offset
3150 /* Check to make sure it isn't a protected function symbol
3151 for shared library since it may not be local when used
3152 as function address. */
3156 && h
->type
== STT_FUNC
3157 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3159 (*_bfd_error_handler
)
3160 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3161 input_bfd
, h
->root
.root
.string
);
3162 bfd_set_error (bfd_error_bad_value
);
3166 /* Note that sgot is not involved in this
3167 calculation. We always want the start of .got.plt. If we
3168 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3169 permitted by the ABI, we might have to change this
3171 relocation
-= htab
->sgotplt
->output_section
->vma
3172 + htab
->sgotplt
->output_offset
;
3175 case R_X86_64_GOTPC32
:
3176 case R_X86_64_GOTPC64
:
3177 /* Use global offset table as symbol value. */
3178 relocation
= htab
->sgotplt
->output_section
->vma
3179 + htab
->sgotplt
->output_offset
;
3180 unresolved_reloc
= FALSE
;
3183 case R_X86_64_PLTOFF64
:
3184 /* Relocation is PLT entry relative to GOT. For local
3185 symbols it's the symbol itself relative to GOT. */
3187 /* See PLT32 handling. */
3188 && h
->plt
.offset
!= (bfd_vma
) -1
3189 && htab
->splt
!= NULL
)
3191 relocation
= (htab
->splt
->output_section
->vma
3192 + htab
->splt
->output_offset
3194 unresolved_reloc
= FALSE
;
3197 relocation
-= htab
->sgotplt
->output_section
->vma
3198 + htab
->sgotplt
->output_offset
;
3201 case R_X86_64_PLT32
:
3202 /* Relocation is to the entry for this symbol in the
3203 procedure linkage table. */
3205 /* Resolve a PLT32 reloc against a local symbol directly,
3206 without using the procedure linkage table. */
3210 if (h
->plt
.offset
== (bfd_vma
) -1
3211 || htab
->splt
== NULL
)
3213 /* We didn't make a PLT entry for this symbol. This
3214 happens when statically linking PIC code, or when
3215 using -Bsymbolic. */
3219 relocation
= (htab
->splt
->output_section
->vma
3220 + htab
->splt
->output_offset
3222 unresolved_reloc
= FALSE
;
3229 && (input_section
->flags
& SEC_ALLOC
) != 0
3230 && (input_section
->flags
& SEC_READONLY
) != 0
3233 bfd_boolean fail
= FALSE
;
3235 = (r_type
== R_X86_64_PC32
3236 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3238 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3240 /* Symbol is referenced locally. Make sure it is
3241 defined locally or for a branch. */
3242 fail
= !h
->def_regular
&& !branch
;
3246 /* Symbol isn't referenced locally. We only allow
3247 branch to symbol with non-default visibility. */
3249 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3256 const char *pic
= "";
3258 switch (ELF_ST_VISIBILITY (h
->other
))
3261 v
= _("hidden symbol");
3264 v
= _("internal symbol");
3267 v
= _("protected symbol");
3271 pic
= _("; recompile with -fPIC");
3276 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3278 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3280 (*_bfd_error_handler
) (fmt
, input_bfd
,
3281 x86_64_elf_howto_table
[r_type
].name
,
3282 v
, h
->root
.root
.string
, pic
);
3283 bfd_set_error (bfd_error_bad_value
);
3294 /* FIXME: The ABI says the linker should make sure the value is
3295 the same when it's zeroextended to 64 bit. */
3297 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3302 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3303 || h
->root
.type
!= bfd_link_hash_undefweak
)
3304 && (! IS_X86_64_PCREL_TYPE (r_type
)
3305 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3306 || (ELIMINATE_COPY_RELOCS
3313 || h
->root
.type
== bfd_link_hash_undefweak
3314 || h
->root
.type
== bfd_link_hash_undefined
)))
3316 Elf_Internal_Rela outrel
;
3318 bfd_boolean skip
, relocate
;
3321 /* When generating a shared object, these relocations
3322 are copied into the output file to be resolved at run
3328 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3330 if (outrel
.r_offset
== (bfd_vma
) -1)
3332 else if (outrel
.r_offset
== (bfd_vma
) -2)
3333 skip
= TRUE
, relocate
= TRUE
;
3335 outrel
.r_offset
+= (input_section
->output_section
->vma
3336 + input_section
->output_offset
);
3339 memset (&outrel
, 0, sizeof outrel
);
3341 /* h->dynindx may be -1 if this symbol was marked to
3345 && (IS_X86_64_PCREL_TYPE (r_type
)
3347 || ! SYMBOLIC_BIND (info
, h
)
3348 || ! h
->def_regular
))
3350 outrel
.r_info
= ELF64_R_INFO (h
->dynindx
, r_type
);
3351 outrel
.r_addend
= rel
->r_addend
;
3355 /* This symbol is local, or marked to become local. */
3356 if (r_type
== R_X86_64_64
)
3359 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
3360 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3366 if (bfd_is_abs_section (sec
))
3368 else if (sec
== NULL
|| sec
->owner
== NULL
)
3370 bfd_set_error (bfd_error_bad_value
);
3377 /* We are turning this relocation into one
3378 against a section symbol. It would be
3379 proper to subtract the symbol's value,
3380 osec->vma, from the emitted reloc addend,
3381 but ld.so expects buggy relocs. */
3382 osec
= sec
->output_section
;
3383 sindx
= elf_section_data (osec
)->dynindx
;
3386 asection
*oi
= htab
->elf
.text_index_section
;
3387 sindx
= elf_section_data (oi
)->dynindx
;
3389 BFD_ASSERT (sindx
!= 0);
3392 outrel
.r_info
= ELF64_R_INFO (sindx
, r_type
);
3393 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3397 sreloc
= elf_section_data (input_section
)->sreloc
;
3399 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
3401 loc
= sreloc
->contents
;
3402 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3403 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3405 /* If this reloc is against an external symbol, we do
3406 not want to fiddle with the addend. Otherwise, we
3407 need to include the symbol value so that it becomes
3408 an addend for the dynamic reloc. */
3415 case R_X86_64_TLSGD
:
3416 case R_X86_64_GOTPC32_TLSDESC
:
3417 case R_X86_64_TLSDESC_CALL
:
3418 case R_X86_64_GOTTPOFF
:
3419 tls_type
= GOT_UNKNOWN
;
3420 if (h
== NULL
&& local_got_offsets
)
3421 tls_type
= elf64_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3423 tls_type
= elf64_x86_64_hash_entry (h
)->tls_type
;
3425 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3426 input_section
, contents
,
3427 symtab_hdr
, sym_hashes
,
3428 &r_type
, tls_type
, rel
,
3432 if (r_type
== R_X86_64_TPOFF32
)
3434 bfd_vma roff
= rel
->r_offset
;
3436 BFD_ASSERT (! unresolved_reloc
);
3438 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3440 /* GD->LE transition.
3441 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3442 .word 0x6666; rex64; call __tls_get_addr
3445 leaq foo@tpoff(%rax), %rax */
3446 memcpy (contents
+ roff
- 4,
3447 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3449 bfd_put_32 (output_bfd
,
3450 elf64_x86_64_tpoff (info
, relocation
),
3451 contents
+ roff
+ 8);
3452 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3456 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3458 /* GDesc -> LE transition.
3459 It's originally something like:
3460 leaq x@tlsdesc(%rip), %rax
3466 unsigned int val
, type
, type2
;
3468 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3469 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3470 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3471 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3472 contents
+ roff
- 3);
3473 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3474 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3475 contents
+ roff
- 1);
3476 bfd_put_32 (output_bfd
,
3477 elf64_x86_64_tpoff (info
, relocation
),
3481 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3483 /* GDesc -> LE transition.
3488 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3489 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3492 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3494 /* IE->LE transition:
3495 Originally it can be one of:
3496 movq foo@gottpoff(%rip), %reg
3497 addq foo@gottpoff(%rip), %reg
3500 leaq foo(%reg), %reg
3503 unsigned int val
, type
, reg
;
3505 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3506 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3507 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3513 bfd_put_8 (output_bfd
, 0x49,
3514 contents
+ roff
- 3);
3515 bfd_put_8 (output_bfd
, 0xc7,
3516 contents
+ roff
- 2);
3517 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3518 contents
+ roff
- 1);
3522 /* addq -> addq - addressing with %rsp/%r12 is
3525 bfd_put_8 (output_bfd
, 0x49,
3526 contents
+ roff
- 3);
3527 bfd_put_8 (output_bfd
, 0x81,
3528 contents
+ roff
- 2);
3529 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3530 contents
+ roff
- 1);
3536 bfd_put_8 (output_bfd
, 0x4d,
3537 contents
+ roff
- 3);
3538 bfd_put_8 (output_bfd
, 0x8d,
3539 contents
+ roff
- 2);
3540 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3541 contents
+ roff
- 1);
3543 bfd_put_32 (output_bfd
,
3544 elf64_x86_64_tpoff (info
, relocation
),
3552 if (htab
->sgot
== NULL
)
3557 off
= h
->got
.offset
;
3558 offplt
= elf64_x86_64_hash_entry (h
)->tlsdesc_got
;
3562 if (local_got_offsets
== NULL
)
3565 off
= local_got_offsets
[r_symndx
];
3566 offplt
= local_tlsdesc_gotents
[r_symndx
];
3573 Elf_Internal_Rela outrel
;
3578 if (htab
->srelgot
== NULL
)
3581 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3583 if (GOT_TLS_GDESC_P (tls_type
))
3585 outrel
.r_info
= ELF64_R_INFO (indx
, R_X86_64_TLSDESC
);
3586 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3587 + 2 * GOT_ENTRY_SIZE
<= htab
->sgotplt
->size
);
3588 outrel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3589 + htab
->sgotplt
->output_offset
3591 + htab
->sgotplt_jump_table_size
);
3592 sreloc
= htab
->srelplt
;
3593 loc
= sreloc
->contents
;
3594 loc
+= sreloc
->reloc_count
++
3595 * sizeof (Elf64_External_Rela
);
3596 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3597 <= sreloc
->contents
+ sreloc
->size
);
3599 outrel
.r_addend
= relocation
- elf64_x86_64_dtpoff_base (info
);
3601 outrel
.r_addend
= 0;
3602 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3605 sreloc
= htab
->srelgot
;
3607 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3608 + htab
->sgot
->output_offset
+ off
);
3610 if (GOT_TLS_GD_P (tls_type
))
3611 dr_type
= R_X86_64_DTPMOD64
;
3612 else if (GOT_TLS_GDESC_P (tls_type
))
3615 dr_type
= R_X86_64_TPOFF64
;
3617 bfd_put_64 (output_bfd
, 0, htab
->sgot
->contents
+ off
);
3618 outrel
.r_addend
= 0;
3619 if ((dr_type
== R_X86_64_TPOFF64
3620 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3621 outrel
.r_addend
= relocation
- elf64_x86_64_dtpoff_base (info
);
3622 outrel
.r_info
= ELF64_R_INFO (indx
, dr_type
);
3624 loc
= sreloc
->contents
;
3625 loc
+= sreloc
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3626 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3627 <= sreloc
->contents
+ sreloc
->size
);
3628 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3630 if (GOT_TLS_GD_P (tls_type
))
3634 BFD_ASSERT (! unresolved_reloc
);
3635 bfd_put_64 (output_bfd
,
3636 relocation
- elf64_x86_64_dtpoff_base (info
),
3637 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3641 bfd_put_64 (output_bfd
, 0,
3642 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3643 outrel
.r_info
= ELF64_R_INFO (indx
,
3645 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3646 sreloc
->reloc_count
++;
3647 loc
+= sizeof (Elf64_External_Rela
);
3648 BFD_ASSERT (loc
+ sizeof (Elf64_External_Rela
)
3649 <= sreloc
->contents
+ sreloc
->size
);
3650 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3658 local_got_offsets
[r_symndx
] |= 1;
3661 if (off
>= (bfd_vma
) -2
3662 && ! GOT_TLS_GDESC_P (tls_type
))
3664 if (r_type
== ELF64_R_TYPE (rel
->r_info
))
3666 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3667 || r_type
== R_X86_64_TLSDESC_CALL
)
3668 relocation
= htab
->sgotplt
->output_section
->vma
3669 + htab
->sgotplt
->output_offset
3670 + offplt
+ htab
->sgotplt_jump_table_size
;
3672 relocation
= htab
->sgot
->output_section
->vma
3673 + htab
->sgot
->output_offset
+ off
;
3674 unresolved_reloc
= FALSE
;
3678 bfd_vma roff
= rel
->r_offset
;
3680 if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3682 /* GD->IE transition.
3683 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3684 .word 0x6666; rex64; call __tls_get_addr@plt
3687 addq foo@gottpoff(%rip), %rax */
3688 memcpy (contents
+ roff
- 4,
3689 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3692 relocation
= (htab
->sgot
->output_section
->vma
3693 + htab
->sgot
->output_offset
+ off
3695 - input_section
->output_section
->vma
3696 - input_section
->output_offset
3698 bfd_put_32 (output_bfd
, relocation
,
3699 contents
+ roff
+ 8);
3700 /* Skip R_X86_64_PLT32. */
3704 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3706 /* GDesc -> IE transition.
3707 It's originally something like:
3708 leaq x@tlsdesc(%rip), %rax
3711 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3714 unsigned int val
, type
, type2
;
3716 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3717 type2
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3718 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3720 /* Now modify the instruction as appropriate. To
3721 turn a leaq into a movq in the form we use it, it
3722 suffices to change the second byte from 0x8d to
3724 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3726 bfd_put_32 (output_bfd
,
3727 htab
->sgot
->output_section
->vma
3728 + htab
->sgot
->output_offset
+ off
3730 - input_section
->output_section
->vma
3731 - input_section
->output_offset
3736 else if (ELF64_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3738 /* GDesc -> IE transition.
3745 unsigned int val
, type
;
3747 type
= bfd_get_8 (input_bfd
, contents
+ roff
);
3748 val
= bfd_get_8 (input_bfd
, contents
+ roff
+ 1);
3749 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3750 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3758 case R_X86_64_TLSLD
:
3759 if (! elf64_x86_64_tls_transition (info
, input_bfd
,
3760 input_section
, contents
,
3761 symtab_hdr
, sym_hashes
,
3762 &r_type
, GOT_UNKNOWN
,
3766 if (r_type
!= R_X86_64_TLSLD
)
3768 /* LD->LE transition:
3769 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3771 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3773 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3774 memcpy (contents
+ rel
->r_offset
- 3,
3775 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3776 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3781 if (htab
->sgot
== NULL
)
3784 off
= htab
->tls_ld_got
.offset
;
3789 Elf_Internal_Rela outrel
;
3792 if (htab
->srelgot
== NULL
)
3795 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3796 + htab
->sgot
->output_offset
+ off
);
3798 bfd_put_64 (output_bfd
, 0,
3799 htab
->sgot
->contents
+ off
);
3800 bfd_put_64 (output_bfd
, 0,
3801 htab
->sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3802 outrel
.r_info
= ELF64_R_INFO (0, R_X86_64_DTPMOD64
);
3803 outrel
.r_addend
= 0;
3804 loc
= htab
->srelgot
->contents
;
3805 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
3806 bfd_elf64_swap_reloca_out (output_bfd
, &outrel
, loc
);
3807 htab
->tls_ld_got
.offset
|= 1;
3809 relocation
= htab
->sgot
->output_section
->vma
3810 + htab
->sgot
->output_offset
+ off
;
3811 unresolved_reloc
= FALSE
;
3814 case R_X86_64_DTPOFF32
:
3815 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
3816 relocation
-= elf64_x86_64_dtpoff_base (info
);
3818 relocation
= elf64_x86_64_tpoff (info
, relocation
);
3821 case R_X86_64_TPOFF32
:
3822 BFD_ASSERT (! info
->shared
);
3823 relocation
= elf64_x86_64_tpoff (info
, relocation
);
3830 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3831 because such sections are not SEC_ALLOC and thus ld.so will
3832 not process them. */
3833 if (unresolved_reloc
3834 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3836 (*_bfd_error_handler
)
3837 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3840 (long) rel
->r_offset
,
3842 h
->root
.root
.string
);
3845 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3846 contents
, rel
->r_offset
,
3847 relocation
, rel
->r_addend
);
3849 if (r
!= bfd_reloc_ok
)
3854 name
= h
->root
.root
.string
;
3857 name
= bfd_elf_string_from_elf_section (input_bfd
,
3858 symtab_hdr
->sh_link
,
3863 name
= bfd_section_name (input_bfd
, sec
);
3866 if (r
== bfd_reloc_overflow
)
3868 if (! ((*info
->callbacks
->reloc_overflow
)
3869 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3870 (bfd_vma
) 0, input_bfd
, input_section
,
3876 (*_bfd_error_handler
)
3877 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3878 input_bfd
, input_section
,
3879 (long) rel
->r_offset
, name
, (int) r
);
3888 /* Finish up dynamic symbol handling. We set the contents of various
3889 dynamic sections here. */
3892 elf64_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3893 struct bfd_link_info
*info
,
3894 struct elf_link_hash_entry
*h
,
3895 Elf_Internal_Sym
*sym
)
3897 struct elf64_x86_64_link_hash_table
*htab
;
3899 htab
= elf64_x86_64_hash_table (info
);
3901 if (h
->plt
.offset
!= (bfd_vma
) -1)
3905 Elf_Internal_Rela rela
;
3907 asection
*plt
, *gotplt
, *relplt
;
3909 /* When building a static executable, use .iplt, .igot.plt and
3910 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3911 if (htab
->splt
!= NULL
)
3914 gotplt
= htab
->sgotplt
;
3915 relplt
= htab
->srelplt
;
3920 gotplt
= htab
->igotplt
;
3921 relplt
= htab
->irelplt
;
3924 /* This symbol has an entry in the procedure linkage table. Set
3926 if ((h
->dynindx
== -1
3927 && !((h
->forced_local
|| info
->executable
)
3929 && h
->type
== STT_GNU_IFUNC
))
3935 /* Get the index in the procedure linkage table which
3936 corresponds to this symbol. This is the index of this symbol
3937 in all the symbols for which we are making plt entries. The
3938 first entry in the procedure linkage table is reserved.
3940 Get the offset into the .got table of the entry that
3941 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3942 bytes. The first three are reserved for the dynamic linker.
3944 For static executables, we don't reserve anything. */
3946 if (plt
== htab
->splt
)
3948 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3949 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3953 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3954 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
3957 /* Fill in the entry in the procedure linkage table. */
3958 memcpy (plt
->contents
+ h
->plt
.offset
, elf64_x86_64_plt_entry
,
3961 /* Insert the relocation positions of the plt section. The magic
3962 numbers at the end of the statements are the positions of the
3963 relocations in the plt section. */
3964 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3965 instruction uses 6 bytes, subtract this value. */
3966 bfd_put_32 (output_bfd
,
3967 (gotplt
->output_section
->vma
3968 + gotplt
->output_offset
3970 - plt
->output_section
->vma
3971 - plt
->output_offset
3974 plt
->contents
+ h
->plt
.offset
+ 2);
3976 /* Don't fill PLT entry for static executables. */
3977 if (plt
== htab
->splt
)
3979 /* Put relocation index. */
3980 bfd_put_32 (output_bfd
, plt_index
,
3981 plt
->contents
+ h
->plt
.offset
+ 7);
3982 /* Put offset for jmp .PLT0. */
3983 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3984 plt
->contents
+ h
->plt
.offset
+ 12);
3987 /* Fill in the entry in the global offset table, initially this
3988 points to the pushq instruction in the PLT which is at offset 6. */
3989 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
3990 + plt
->output_offset
3991 + h
->plt
.offset
+ 6),
3992 gotplt
->contents
+ got_offset
);
3994 /* Fill in the entry in the .rela.plt section. */
3995 rela
.r_offset
= (gotplt
->output_section
->vma
3996 + gotplt
->output_offset
3998 if (h
->dynindx
== -1
3999 || ((info
->executable
4000 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4002 && h
->type
== STT_GNU_IFUNC
))
4004 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4005 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4006 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_IRELATIVE
);
4007 rela
.r_addend
= (h
->root
.u
.def
.value
4008 + h
->root
.u
.def
.section
->output_section
->vma
4009 + h
->root
.u
.def
.section
->output_offset
);
4013 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4016 loc
= relplt
->contents
+ plt_index
* sizeof (Elf64_External_Rela
);
4017 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
4019 if (!h
->def_regular
)
4021 /* Mark the symbol as undefined, rather than as defined in
4022 the .plt section. Leave the value if there were any
4023 relocations where pointer equality matters (this is a clue
4024 for the dynamic linker, to make function pointer
4025 comparisons work between an application and shared
4026 library), otherwise set it to zero. If a function is only
4027 called from a binary, there is no need to slow down
4028 shared libraries because of that. */
4029 sym
->st_shndx
= SHN_UNDEF
;
4030 if (!h
->pointer_equality_needed
)
4035 if (h
->got
.offset
!= (bfd_vma
) -1
4036 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h
)->tls_type
)
4037 && elf64_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4039 Elf_Internal_Rela rela
;
4042 /* This symbol has an entry in the global offset table. Set it
4044 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
4047 rela
.r_offset
= (htab
->sgot
->output_section
->vma
4048 + htab
->sgot
->output_offset
4049 + (h
->got
.offset
&~ (bfd_vma
) 1));
4051 /* If this is a static link, or it is a -Bsymbolic link and the
4052 symbol is defined locally or was forced to be local because
4053 of a version file, we just want to emit a RELATIVE reloc.
4054 The entry in the global offset table will already have been
4055 initialized in the relocate_section function. */
4057 && h
->type
== STT_GNU_IFUNC
)
4061 /* Generate R_X86_64_GLOB_DAT. */
4066 if (!h
->pointer_equality_needed
)
4069 /* For non-shared object, we can't use .got.plt, which
4070 contains the real function addres if we need pointer
4071 equality. We load the GOT entry with the PLT entry. */
4072 asection
*plt
= htab
->splt
? htab
->splt
: htab
->iplt
;
4073 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4074 + plt
->output_offset
4076 htab
->sgot
->contents
+ h
->got
.offset
);
4080 else if (info
->shared
4081 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4083 if (!h
->def_regular
)
4085 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4086 rela
.r_info
= ELF64_R_INFO (0, R_X86_64_RELATIVE
);
4087 rela
.r_addend
= (h
->root
.u
.def
.value
4088 + h
->root
.u
.def
.section
->output_section
->vma
4089 + h
->root
.u
.def
.section
->output_offset
);
4093 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4095 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4096 htab
->sgot
->contents
+ h
->got
.offset
);
4097 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_GLOB_DAT
);
4101 loc
= htab
->srelgot
->contents
;
4102 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf64_External_Rela
);
4103 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
4108 Elf_Internal_Rela rela
;
4111 /* This symbol needs a copy reloc. Set it up. */
4113 if (h
->dynindx
== -1
4114 || (h
->root
.type
!= bfd_link_hash_defined
4115 && h
->root
.type
!= bfd_link_hash_defweak
)
4116 || htab
->srelbss
== NULL
)
4119 rela
.r_offset
= (h
->root
.u
.def
.value
4120 + h
->root
.u
.def
.section
->output_section
->vma
4121 + h
->root
.u
.def
.section
->output_offset
);
4122 rela
.r_info
= ELF64_R_INFO (h
->dynindx
, R_X86_64_COPY
);
4124 loc
= htab
->srelbss
->contents
;
4125 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf64_External_Rela
);
4126 bfd_elf64_swap_reloca_out (output_bfd
, &rela
, loc
);
4129 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4130 be NULL for local symbols. */
4132 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4133 || h
== htab
->elf
.hgot
))
4134 sym
->st_shndx
= SHN_ABS
;
4139 /* Finish up local dynamic symbol handling. We set the contents of
4140 various dynamic sections here. */
4143 elf64_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4145 struct elf_link_hash_entry
*h
4146 = (struct elf_link_hash_entry
*) *slot
;
4147 struct bfd_link_info
*info
4148 = (struct bfd_link_info
*) inf
;
4150 return elf64_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4154 /* Used to decide how to sort relocs in an optimal manner for the
4155 dynamic linker, before writing them out. */
4157 static enum elf_reloc_type_class
4158 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4160 switch ((int) ELF64_R_TYPE (rela
->r_info
))
4162 case R_X86_64_RELATIVE
:
4163 return reloc_class_relative
;
4164 case R_X86_64_JUMP_SLOT
:
4165 return reloc_class_plt
;
4167 return reloc_class_copy
;
4169 return reloc_class_normal
;
4173 /* Finish up the dynamic sections. */
4176 elf64_x86_64_finish_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
4178 struct elf64_x86_64_link_hash_table
*htab
;
4182 htab
= elf64_x86_64_hash_table (info
);
4183 dynobj
= htab
->elf
.dynobj
;
4184 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4186 if (htab
->elf
.dynamic_sections_created
)
4188 Elf64_External_Dyn
*dyncon
, *dynconend
;
4190 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
4193 dyncon
= (Elf64_External_Dyn
*) sdyn
->contents
;
4194 dynconend
= (Elf64_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
4195 for (; dyncon
< dynconend
; dyncon
++)
4197 Elf_Internal_Dyn dyn
;
4200 bfd_elf64_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4209 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4213 dyn
.d_un
.d_ptr
= htab
->srelplt
->output_section
->vma
;
4217 s
= htab
->srelplt
->output_section
;
4218 dyn
.d_un
.d_val
= s
->size
;
4222 /* The procedure linkage table relocs (DT_JMPREL) should
4223 not be included in the overall relocs (DT_RELA).
4224 Therefore, we override the DT_RELASZ entry here to
4225 make it not include the JMPREL relocs. Since the
4226 linker script arranges for .rela.plt to follow all
4227 other relocation sections, we don't have to worry
4228 about changing the DT_RELA entry. */
4229 if (htab
->srelplt
!= NULL
)
4231 s
= htab
->srelplt
->output_section
;
4232 dyn
.d_un
.d_val
-= s
->size
;
4236 case DT_TLSDESC_PLT
:
4238 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4239 + htab
->tlsdesc_plt
;
4242 case DT_TLSDESC_GOT
:
4244 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4245 + htab
->tlsdesc_got
;
4249 bfd_elf64_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4252 /* Fill in the special first entry in the procedure linkage table. */
4253 if (htab
->splt
&& htab
->splt
->size
> 0)
4255 /* Fill in the first entry in the procedure linkage table. */
4256 memcpy (htab
->splt
->contents
, elf64_x86_64_plt0_entry
,
4258 /* Add offset for pushq GOT+8(%rip), since the instruction
4259 uses 6 bytes subtract this value. */
4260 bfd_put_32 (output_bfd
,
4261 (htab
->sgotplt
->output_section
->vma
4262 + htab
->sgotplt
->output_offset
4264 - htab
->splt
->output_section
->vma
4265 - htab
->splt
->output_offset
4267 htab
->splt
->contents
+ 2);
4268 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4269 the end of the instruction. */
4270 bfd_put_32 (output_bfd
,
4271 (htab
->sgotplt
->output_section
->vma
4272 + htab
->sgotplt
->output_offset
4274 - htab
->splt
->output_section
->vma
4275 - htab
->splt
->output_offset
4277 htab
->splt
->contents
+ 8);
4279 elf_section_data (htab
->splt
->output_section
)->this_hdr
.sh_entsize
=
4282 if (htab
->tlsdesc_plt
)
4284 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4285 htab
->sgot
->contents
+ htab
->tlsdesc_got
);
4287 memcpy (htab
->splt
->contents
+ htab
->tlsdesc_plt
,
4288 elf64_x86_64_plt0_entry
,
4291 /* Add offset for pushq GOT+8(%rip), since the
4292 instruction uses 6 bytes subtract this value. */
4293 bfd_put_32 (output_bfd
,
4294 (htab
->sgotplt
->output_section
->vma
4295 + htab
->sgotplt
->output_offset
4297 - htab
->splt
->output_section
->vma
4298 - htab
->splt
->output_offset
4301 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4302 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4303 htab->tlsdesc_got. The 12 is the offset to the end of
4305 bfd_put_32 (output_bfd
,
4306 (htab
->sgot
->output_section
->vma
4307 + htab
->sgot
->output_offset
4309 - htab
->splt
->output_section
->vma
4310 - htab
->splt
->output_offset
4313 htab
->splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4320 /* Fill in the first three entries in the global offset table. */
4321 if (htab
->sgotplt
->size
> 0)
4323 /* Set the first entry in the global offset table to the address of
4324 the dynamic section. */
4326 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
);
4328 bfd_put_64 (output_bfd
,
4329 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4330 htab
->sgotplt
->contents
);
4331 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4332 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4333 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4336 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4340 if (htab
->sgot
&& htab
->sgot
->size
> 0)
4341 elf_section_data (htab
->sgot
->output_section
)->this_hdr
.sh_entsize
4344 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4345 htab_traverse (htab
->loc_hash_table
,
4346 elf64_x86_64_finish_local_dynamic_symbol
,
4352 /* Return address for Ith PLT stub in section PLT, for relocation REL
4353 or (bfd_vma) -1 if it should not be included. */
4356 elf64_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4357 const arelent
*rel ATTRIBUTE_UNUSED
)
4359 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4362 /* Handle an x86-64 specific section when reading an object file. This
4363 is called when elfcode.h finds a section with an unknown type. */
4366 elf64_x86_64_section_from_shdr (bfd
*abfd
,
4367 Elf_Internal_Shdr
*hdr
,
4371 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4374 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4380 /* Hook called by the linker routine which adds symbols from an object
4381 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4385 elf64_x86_64_add_symbol_hook (bfd
*abfd
,
4386 struct bfd_link_info
*info
,
4387 Elf_Internal_Sym
*sym
,
4388 const char **namep ATTRIBUTE_UNUSED
,
4389 flagword
*flagsp ATTRIBUTE_UNUSED
,
4395 switch (sym
->st_shndx
)
4397 case SHN_X86_64_LCOMMON
:
4398 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4401 lcomm
= bfd_make_section_with_flags (abfd
,
4405 | SEC_LINKER_CREATED
));
4408 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4411 *valp
= sym
->st_size
;
4415 if (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4416 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4422 /* Given a BFD section, try to locate the corresponding ELF section
4426 elf64_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4427 asection
*sec
, int *index
)
4429 if (sec
== &_bfd_elf_large_com_section
)
4431 *index
= SHN_X86_64_LCOMMON
;
4437 /* Process a symbol. */
4440 elf64_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4443 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4445 switch (elfsym
->internal_elf_sym
.st_shndx
)
4447 case SHN_X86_64_LCOMMON
:
4448 asym
->section
= &_bfd_elf_large_com_section
;
4449 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4450 /* Common symbol doesn't set BSF_GLOBAL. */
4451 asym
->flags
&= ~BSF_GLOBAL
;
4457 elf64_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4459 return (sym
->st_shndx
== SHN_COMMON
4460 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4464 elf64_x86_64_common_section_index (asection
*sec
)
4466 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4469 return SHN_X86_64_LCOMMON
;
4473 elf64_x86_64_common_section (asection
*sec
)
4475 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4476 return bfd_com_section_ptr
;
4478 return &_bfd_elf_large_com_section
;
4482 elf64_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4483 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4484 struct elf_link_hash_entry
*h
,
4485 Elf_Internal_Sym
*sym
,
4487 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4488 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4489 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4490 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4491 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4492 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4493 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4494 bfd_boolean
*newdyn
,
4495 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4496 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4497 bfd
*abfd ATTRIBUTE_UNUSED
,
4499 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4500 bfd_boolean
*olddyn
,
4501 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4502 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4506 /* A normal common symbol and a large common symbol result in a
4507 normal common symbol. We turn the large common symbol into a
4510 && h
->root
.type
== bfd_link_hash_common
4512 && bfd_is_com_section (*sec
)
4515 if (sym
->st_shndx
== SHN_COMMON
4516 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4518 h
->root
.u
.c
.p
->section
4519 = bfd_make_section_old_way (oldbfd
, "COMMON");
4520 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4522 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4523 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4524 *psec
= *sec
= bfd_com_section_ptr
;
4531 elf64_x86_64_additional_program_headers (bfd
*abfd
,
4532 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4537 /* Check to see if we need a large readonly segment. */
4538 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4539 if (s
&& (s
->flags
& SEC_LOAD
))
4542 /* Check to see if we need a large data segment. Since .lbss sections
4543 is placed right after the .bss section, there should be no need for
4544 a large data segment just because of .lbss. */
4545 s
= bfd_get_section_by_name (abfd
, ".ldata");
4546 if (s
&& (s
->flags
& SEC_LOAD
))
4552 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4555 elf64_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4557 if (h
->plt
.offset
!= (bfd_vma
) -1
4559 && !h
->pointer_equality_needed
)
4562 return _bfd_elf_hash_symbol (h
);
4565 static const struct bfd_elf_special_section
4566 elf64_x86_64_special_sections
[]=
4568 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4569 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4570 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4571 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4572 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4573 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4574 { NULL
, 0, 0, 0, 0 }
4577 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4578 #define TARGET_LITTLE_NAME "elf64-x86-64"
4579 #define ELF_ARCH bfd_arch_i386
4580 #define ELF_MACHINE_CODE EM_X86_64
4581 #define ELF_MAXPAGESIZE 0x200000
4582 #define ELF_MINPAGESIZE 0x1000
4583 #define ELF_COMMONPAGESIZE 0x1000
4585 #define elf_backend_can_gc_sections 1
4586 #define elf_backend_can_refcount 1
4587 #define elf_backend_want_got_plt 1
4588 #define elf_backend_plt_readonly 1
4589 #define elf_backend_want_plt_sym 0
4590 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4591 #define elf_backend_rela_normal 1
4593 #define elf_info_to_howto elf64_x86_64_info_to_howto
4595 #define bfd_elf64_bfd_link_hash_table_create \
4596 elf64_x86_64_link_hash_table_create
4597 #define bfd_elf64_bfd_link_hash_table_free \
4598 elf64_x86_64_link_hash_table_free
4599 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
4600 #define bfd_elf64_bfd_reloc_name_lookup \
4601 elf64_x86_64_reloc_name_lookup
4603 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
4604 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4605 #define elf_backend_check_relocs elf64_x86_64_check_relocs
4606 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4607 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4608 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4609 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4610 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4611 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
4612 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4613 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
4614 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
4615 #define elf_backend_relocate_section elf64_x86_64_relocate_section
4616 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
4617 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
4618 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4619 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
4620 #define elf_backend_object_p elf64_x86_64_elf_object_p
4621 #define bfd_elf64_mkobject elf64_x86_64_mkobject
4623 #define elf_backend_section_from_shdr \
4624 elf64_x86_64_section_from_shdr
4626 #define elf_backend_section_from_bfd_section \
4627 elf64_x86_64_elf_section_from_bfd_section
4628 #define elf_backend_add_symbol_hook \
4629 elf64_x86_64_add_symbol_hook
4630 #define elf_backend_symbol_processing \
4631 elf64_x86_64_symbol_processing
4632 #define elf_backend_common_section_index \
4633 elf64_x86_64_common_section_index
4634 #define elf_backend_common_section \
4635 elf64_x86_64_common_section
4636 #define elf_backend_common_definition \
4637 elf64_x86_64_common_definition
4638 #define elf_backend_merge_symbol \
4639 elf64_x86_64_merge_symbol
4640 #define elf_backend_special_sections \
4641 elf64_x86_64_special_sections
4642 #define elf_backend_additional_program_headers \
4643 elf64_x86_64_additional_program_headers
4644 #define elf_backend_hash_symbol \
4645 elf64_x86_64_hash_symbol
4647 #undef elf_backend_post_process_headers
4648 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4650 #include "elf64-target.h"
4652 /* FreeBSD support. */
4654 #undef TARGET_LITTLE_SYM
4655 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4656 #undef TARGET_LITTLE_NAME
4657 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4660 #define ELF_OSABI ELFOSABI_FREEBSD
4663 #define elf64_bed elf64_x86_64_fbsd_bed
4665 #include "elf64-target.h"