1 /* X86-64 specific support for ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 Free Software Foundation, Inc.
5 Contributed by Jan Hubicka <jh@suse.cz>.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
29 #include "bfd_stdint.h"
33 #include "elf/x86-64.h"
35 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
36 #define MINUS_ONE (~ (bfd_vma) 0)
38 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
39 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
40 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
41 since they are the same. */
43 #define ABI_64_P(abfd) \
44 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
46 /* The relocation "howto" table. Order of fields:
47 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
48 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
49 static reloc_howto_type x86_64_elf_howto_table
[] =
51 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
52 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
54 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
55 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
57 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
58 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
60 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
61 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
63 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
64 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
66 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
67 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
69 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
70 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
72 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
73 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
75 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
76 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
78 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
79 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
81 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
82 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
84 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
85 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
87 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
88 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
89 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
90 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
91 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
92 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
93 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
94 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
95 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
96 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
98 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
99 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
101 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
102 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
104 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
105 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
107 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
108 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
110 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
111 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
113 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
114 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
116 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
117 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
119 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
120 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
122 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
123 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
124 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
125 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
126 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
127 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
128 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
129 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
131 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
132 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
134 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
135 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
136 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
137 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
138 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
140 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
141 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
145 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
146 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
147 "R_X86_64_GOTPC32_TLSDESC",
148 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
149 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
150 complain_overflow_dont
, bfd_elf_generic_reloc
,
151 "R_X86_64_TLSDESC_CALL",
153 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
154 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
156 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
157 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
158 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
161 /* We have a gap in the reloc numbers here.
162 R_X86_64_standard counts the number up to this point, and
163 R_X86_64_vt_offset is the value to subtract from a reloc type of
164 R_X86_64_GNU_VT* to form an index into this table. */
165 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
166 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
168 /* GNU extension to record C++ vtable hierarchy. */
169 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
170 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
172 /* GNU extension to record C++ vtable member usage. */
173 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
174 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
178 #define IS_X86_64_PCREL_TYPE(TYPE) \
179 ( ((TYPE) == R_X86_64_PC8) \
180 || ((TYPE) == R_X86_64_PC16) \
181 || ((TYPE) == R_X86_64_PC32) \
182 || ((TYPE) == R_X86_64_PC64))
184 /* Map BFD relocs to the x86_64 elf relocs. */
187 bfd_reloc_code_real_type bfd_reloc_val
;
188 unsigned char elf_reloc_val
;
191 static const struct elf_reloc_map x86_64_reloc_map
[] =
193 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
194 { BFD_RELOC_64
, R_X86_64_64
, },
195 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
196 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
197 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
198 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
199 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
200 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
201 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
202 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
203 { BFD_RELOC_32
, R_X86_64_32
, },
204 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
205 { BFD_RELOC_16
, R_X86_64_16
, },
206 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
207 { BFD_RELOC_8
, R_X86_64_8
, },
208 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
209 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
210 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
211 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
212 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
213 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
214 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
215 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
216 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
217 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
218 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
219 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
220 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
221 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
222 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
223 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
224 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
225 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
226 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
227 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
228 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
229 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
230 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
233 static reloc_howto_type
*
234 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
238 if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
239 || r_type
>= (unsigned int) R_X86_64_max
)
241 if (r_type
>= (unsigned int) R_X86_64_standard
)
243 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
245 r_type
= R_X86_64_NONE
;
250 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
251 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
252 return &x86_64_elf_howto_table
[i
];
255 /* Given a BFD reloc type, return a HOWTO structure. */
256 static reloc_howto_type
*
257 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
258 bfd_reloc_code_real_type code
)
262 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
265 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
266 return elf_x86_64_rtype_to_howto (abfd
,
267 x86_64_reloc_map
[i
].elf_reloc_val
);
272 static reloc_howto_type
*
273 elf_x86_64_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
279 i
< (sizeof (x86_64_elf_howto_table
)
280 / sizeof (x86_64_elf_howto_table
[0]));
282 if (x86_64_elf_howto_table
[i
].name
!= NULL
283 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
284 return &x86_64_elf_howto_table
[i
];
289 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
292 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
293 Elf_Internal_Rela
*dst
)
297 r_type
= ELF32_R_TYPE (dst
->r_info
);
298 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
299 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
302 /* Support for core dump NOTE sections. */
304 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
309 switch (note
->descsz
)
314 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
316 elf_tdata (abfd
)->core_signal
317 = bfd_get_16 (abfd
, note
->descdata
+ 12);
320 elf_tdata (abfd
)->core_lwpid
321 = bfd_get_32 (abfd
, note
->descdata
+ 32);
330 /* Make a ".reg/999" section. */
331 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
332 size
, note
->descpos
+ offset
);
336 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
338 switch (note
->descsz
)
343 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
344 elf_tdata (abfd
)->core_pid
345 = bfd_get_32 (abfd
, note
->descdata
+ 24);
346 elf_tdata (abfd
)->core_program
347 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
348 elf_tdata (abfd
)->core_command
349 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
352 /* Note that for some reason, a spurious space is tacked
353 onto the end of the args in some (at least one anyway)
354 implementations, so strip it off if it exists. */
357 char *command
= elf_tdata (abfd
)->core_command
;
358 int n
= strlen (command
);
360 if (0 < n
&& command
[n
- 1] == ' ')
361 command
[n
- 1] = '\0';
367 /* Functions for the x86-64 ELF linker. */
369 /* The name of the dynamic interpreter. This is put in the .interp
372 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
373 #define ELF32_DYNAMIC_INTERPRETER "/lib/ld32.so.1"
375 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
376 copying dynamic variables from a shared lib into an app's dynbss
377 section, and instead use a dynamic relocation to point into the
379 #define ELIMINATE_COPY_RELOCS 1
381 /* The size in bytes of an entry in the global offset table. */
383 #define GOT_ENTRY_SIZE 8
385 /* The size in bytes of an entry in the procedure linkage table. */
387 #define PLT_ENTRY_SIZE 16
389 /* The first entry in a procedure linkage table looks like this. See the
390 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
392 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
394 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
395 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
396 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
399 /* Subsequent entries in a procedure linkage table look like this. */
401 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
403 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
404 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
405 0x68, /* pushq immediate */
406 0, 0, 0, 0, /* replaced with index into relocation table. */
407 0xe9, /* jmp relative */
408 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
411 /* x86-64 ELF linker hash entry. */
413 struct elf_x86_64_link_hash_entry
415 struct elf_link_hash_entry elf
;
417 /* Track dynamic relocs copied for this symbol. */
418 struct elf_dyn_relocs
*dyn_relocs
;
420 #define GOT_UNKNOWN 0
424 #define GOT_TLS_GDESC 4
425 #define GOT_TLS_GD_BOTH_P(type) \
426 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
427 #define GOT_TLS_GD_P(type) \
428 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
429 #define GOT_TLS_GDESC_P(type) \
430 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
431 #define GOT_TLS_GD_ANY_P(type) \
432 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
433 unsigned char tls_type
;
435 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
436 starting at the end of the jump table. */
440 #define elf_x86_64_hash_entry(ent) \
441 ((struct elf_x86_64_link_hash_entry *)(ent))
443 struct elf_x86_64_obj_tdata
445 struct elf_obj_tdata root
;
447 /* tls_type for each local got entry. */
448 char *local_got_tls_type
;
450 /* GOTPLT entries for TLS descriptors. */
451 bfd_vma
*local_tlsdesc_gotent
;
454 #define elf_x86_64_tdata(abfd) \
455 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
457 #define elf_x86_64_local_got_tls_type(abfd) \
458 (elf_x86_64_tdata (abfd)->local_got_tls_type)
460 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
461 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
463 #define is_x86_64_elf(bfd) \
464 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
465 && elf_tdata (bfd) != NULL \
466 && elf_object_id (bfd) == X86_64_ELF_DATA)
469 elf_x86_64_mkobject (bfd
*abfd
)
471 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
475 /* x86-64 ELF linker hash table. */
477 struct elf_x86_64_link_hash_table
479 struct elf_link_hash_table elf
;
481 /* Short-cuts to get to dynamic linker sections. */
487 bfd_signed_vma refcount
;
491 /* The amount of space used by the jump slots in the GOT. */
492 bfd_vma sgotplt_jump_table_size
;
494 /* Small local sym cache. */
495 struct sym_cache sym_cache
;
497 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
498 bfd_vma (*r_sym
) (bfd_vma
);
499 unsigned int pointer_r_type
;
500 const char *dynamic_interpreter
;
501 int dynamic_interpreter_size
;
503 /* _TLS_MODULE_BASE_ symbol. */
504 struct bfd_link_hash_entry
*tls_module_base
;
506 /* Used by local STT_GNU_IFUNC symbols. */
507 htab_t loc_hash_table
;
508 void * loc_hash_memory
;
510 /* The offset into splt of the PLT entry for the TLS descriptor
511 resolver. Special values are 0, if not necessary (or not found
512 to be necessary yet), and -1 if needed but not determined
515 /* The offset into sgot of the GOT entry used by the PLT entry
520 /* Get the x86-64 ELF linker hash table from a link_info structure. */
522 #define elf_x86_64_hash_table(p) \
523 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
524 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
526 #define elf_x86_64_compute_jump_table_size(htab) \
527 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
529 /* Create an entry in an x86-64 ELF linker hash table. */
531 static struct bfd_hash_entry
*
532 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
533 struct bfd_hash_table
*table
,
536 /* Allocate the structure if it has not already been allocated by a
540 entry
= (struct bfd_hash_entry
*)
541 bfd_hash_allocate (table
,
542 sizeof (struct elf_x86_64_link_hash_entry
));
547 /* Call the allocation method of the superclass. */
548 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
551 struct elf_x86_64_link_hash_entry
*eh
;
553 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
554 eh
->dyn_relocs
= NULL
;
555 eh
->tls_type
= GOT_UNKNOWN
;
556 eh
->tlsdesc_got
= (bfd_vma
) -1;
562 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
563 for local symbol so that we can handle local STT_GNU_IFUNC symbols
564 as global symbol. We reuse indx and dynstr_index for local symbol
565 hash since they aren't used by global symbols in this backend. */
568 elf_x86_64_local_htab_hash (const void *ptr
)
570 struct elf_link_hash_entry
*h
571 = (struct elf_link_hash_entry
*) ptr
;
572 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
575 /* Compare local hash entries. */
578 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
580 struct elf_link_hash_entry
*h1
581 = (struct elf_link_hash_entry
*) ptr1
;
582 struct elf_link_hash_entry
*h2
583 = (struct elf_link_hash_entry
*) ptr2
;
585 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
588 /* Find and/or create a hash entry for local symbol. */
590 static struct elf_link_hash_entry
*
591 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
592 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
595 struct elf_x86_64_link_hash_entry e
, *ret
;
596 asection
*sec
= abfd
->sections
;
597 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
598 htab
->r_sym (rel
->r_info
));
601 e
.elf
.indx
= sec
->id
;
602 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
603 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
604 create
? INSERT
: NO_INSERT
);
611 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
615 ret
= (struct elf_x86_64_link_hash_entry
*)
616 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
617 sizeof (struct elf_x86_64_link_hash_entry
));
620 memset (ret
, 0, sizeof (*ret
));
621 ret
->elf
.indx
= sec
->id
;
622 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
623 ret
->elf
.dynindx
= -1;
629 /* Create an X86-64 ELF linker hash table. */
631 static struct bfd_link_hash_table
*
632 elf_x86_64_link_hash_table_create (bfd
*abfd
)
634 struct elf_x86_64_link_hash_table
*ret
;
635 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
637 ret
= (struct elf_x86_64_link_hash_table
*) bfd_malloc (amt
);
641 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
642 elf_x86_64_link_hash_newfunc
,
643 sizeof (struct elf_x86_64_link_hash_entry
),
652 ret
->sym_cache
.abfd
= NULL
;
653 ret
->tlsdesc_plt
= 0;
654 ret
->tlsdesc_got
= 0;
655 ret
->tls_ld_got
.refcount
= 0;
656 ret
->sgotplt_jump_table_size
= 0;
657 ret
->tls_module_base
= NULL
;
661 ret
->r_info
= elf64_r_info
;
662 ret
->r_sym
= elf64_r_sym
;
663 ret
->pointer_r_type
= R_X86_64_64
;
664 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
665 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
669 ret
->r_info
= elf32_r_info
;
670 ret
->r_sym
= elf32_r_sym
;
671 ret
->pointer_r_type
= R_X86_64_32
;
672 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
673 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
676 ret
->loc_hash_table
= htab_try_create (1024,
677 elf_x86_64_local_htab_hash
,
678 elf_x86_64_local_htab_eq
,
680 ret
->loc_hash_memory
= objalloc_create ();
681 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
687 return &ret
->elf
.root
;
690 /* Destroy an X86-64 ELF linker hash table. */
693 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table
*hash
)
695 struct elf_x86_64_link_hash_table
*htab
696 = (struct elf_x86_64_link_hash_table
*) hash
;
698 if (htab
->loc_hash_table
)
699 htab_delete (htab
->loc_hash_table
);
700 if (htab
->loc_hash_memory
)
701 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
702 _bfd_generic_link_hash_table_free (hash
);
705 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
706 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
710 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
711 struct bfd_link_info
*info
)
713 struct elf_x86_64_link_hash_table
*htab
;
715 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
718 htab
= elf_x86_64_hash_table (info
);
722 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
724 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
727 || (!info
->shared
&& !htab
->srelbss
))
733 /* Copy the extra info we tack onto an elf_link_hash_entry. */
736 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
737 struct elf_link_hash_entry
*dir
,
738 struct elf_link_hash_entry
*ind
)
740 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
742 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
743 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
745 if (eind
->dyn_relocs
!= NULL
)
747 if (edir
->dyn_relocs
!= NULL
)
749 struct elf_dyn_relocs
**pp
;
750 struct elf_dyn_relocs
*p
;
752 /* Add reloc counts against the indirect sym to the direct sym
753 list. Merge any entries against the same section. */
754 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
756 struct elf_dyn_relocs
*q
;
758 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
759 if (q
->sec
== p
->sec
)
761 q
->pc_count
+= p
->pc_count
;
762 q
->count
+= p
->count
;
769 *pp
= edir
->dyn_relocs
;
772 edir
->dyn_relocs
= eind
->dyn_relocs
;
773 eind
->dyn_relocs
= NULL
;
776 if (ind
->root
.type
== bfd_link_hash_indirect
777 && dir
->got
.refcount
<= 0)
779 edir
->tls_type
= eind
->tls_type
;
780 eind
->tls_type
= GOT_UNKNOWN
;
783 if (ELIMINATE_COPY_RELOCS
784 && ind
->root
.type
!= bfd_link_hash_indirect
785 && dir
->dynamic_adjusted
)
787 /* If called to transfer flags for a weakdef during processing
788 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
789 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
790 dir
->ref_dynamic
|= ind
->ref_dynamic
;
791 dir
->ref_regular
|= ind
->ref_regular
;
792 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
793 dir
->needs_plt
|= ind
->needs_plt
;
794 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
797 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
801 elf64_x86_64_elf_object_p (bfd
*abfd
)
803 /* Set the right machine number for an x86-64 elf64 file. */
804 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
822 /* Return TRUE if the TLS access code sequence support transition
826 elf_x86_64_check_tls_transition (bfd
*abfd
,
827 struct bfd_link_info
*info
,
830 Elf_Internal_Shdr
*symtab_hdr
,
831 struct elf_link_hash_entry
**sym_hashes
,
833 const Elf_Internal_Rela
*rel
,
834 const Elf_Internal_Rela
*relend
)
837 unsigned long r_symndx
;
838 struct elf_link_hash_entry
*h
;
840 struct elf_x86_64_link_hash_table
*htab
;
842 /* Get the section contents. */
843 if (contents
== NULL
)
845 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
846 contents
= elf_section_data (sec
)->this_hdr
.contents
;
849 /* FIXME: How to better handle error condition? */
850 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
853 /* Cache the section contents for elf_link_input_bfd. */
854 elf_section_data (sec
)->this_hdr
.contents
= contents
;
858 htab
= elf_x86_64_hash_table (info
);
859 offset
= rel
->r_offset
;
864 if ((rel
+ 1) >= relend
)
867 if (r_type
== R_X86_64_TLSGD
)
869 /* Check transition from GD access model. For 64bit, only
870 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
871 .word 0x6666; rex64; call __tls_get_addr
872 can transit to different access model. For 32bit, only
873 leaq foo@tlsgd(%rip), %rdi
874 .word 0x6666; rex64; call __tls_get_addr
875 can transit to different access model. */
877 static x86_64_opcode32 call
= { { 0x66, 0x66, 0x48, 0xe8 } };
878 if ((offset
+ 12) > sec
->size
879 || bfd_get_32 (abfd
, contents
+ offset
+ 4) != call
.i
)
884 static x86_64_opcode32 leaq
= { { 0x66, 0x48, 0x8d, 0x3d } };
886 || bfd_get_32 (abfd
, contents
+ offset
- 4) != leaq
.i
)
891 static x86_64_opcode16 lea
= { { 0x8d, 0x3d } };
893 || bfd_get_8 (abfd
, contents
+ offset
- 3) != 0x48
894 || bfd_get_16 (abfd
, contents
+ offset
- 2) != lea
.i
)
900 /* Check transition from LD access model. Only
901 leaq foo@tlsld(%rip), %rdi;
903 can transit to different access model. */
905 static x86_64_opcode32 ld
= { { 0x48, 0x8d, 0x3d, 0xe8 } };
908 if (offset
< 3 || (offset
+ 9) > sec
->size
)
911 op
.i
= bfd_get_32 (abfd
, contents
+ offset
- 3);
912 op
.c
[3] = bfd_get_8 (abfd
, contents
+ offset
+ 4);
917 r_symndx
= htab
->r_sym (rel
[1].r_info
);
918 if (r_symndx
< symtab_hdr
->sh_info
)
921 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
922 /* Use strncmp to check __tls_get_addr since __tls_get_addr
925 && h
->root
.root
.string
!= NULL
926 && (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
927 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
928 && (strncmp (h
->root
.root
.string
,
929 "__tls_get_addr", 14) == 0));
931 case R_X86_64_GOTTPOFF
:
932 /* Check transition from IE access model:
933 mov foo@gottpoff(%rip), %reg
934 add foo@gottpoff(%rip), %reg
937 /* Check REX prefix first. */
938 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
940 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
941 if (val
!= 0x48 && val
!= 0x4c)
943 /* X32 may have 0x44 REX prefix or no REX prefix. */
950 /* X32 may not have any REX prefix. */
953 if (offset
< 2 || (offset
+ 3) > sec
->size
)
957 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
958 if (val
!= 0x8b && val
!= 0x03)
961 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
962 return (val
& 0xc7) == 5;
964 case R_X86_64_GOTPC32_TLSDESC
:
965 /* Check transition from GDesc access model:
966 leaq x@tlsdesc(%rip), %rax
968 Make sure it's a leaq adding rip to a 32-bit offset
969 into any register, although it's probably almost always
972 if (offset
< 3 || (offset
+ 4) > sec
->size
)
975 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
976 if ((val
& 0xfb) != 0x48)
979 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
982 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
983 return (val
& 0xc7) == 0x05;
985 case R_X86_64_TLSDESC_CALL
:
986 /* Check transition from GDesc access model:
987 call *x@tlsdesc(%rax)
989 if (offset
+ 2 <= sec
->size
)
991 /* Make sure that it's a call *x@tlsdesc(%rax). */
992 static x86_64_opcode16 call
= { { 0xff, 0x10 } };
993 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
1003 /* Return TRUE if the TLS access transition is OK or no transition
1004 will be performed. Update R_TYPE if there is a transition. */
1007 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1008 asection
*sec
, bfd_byte
*contents
,
1009 Elf_Internal_Shdr
*symtab_hdr
,
1010 struct elf_link_hash_entry
**sym_hashes
,
1011 unsigned int *r_type
, int tls_type
,
1012 const Elf_Internal_Rela
*rel
,
1013 const Elf_Internal_Rela
*relend
,
1014 struct elf_link_hash_entry
*h
,
1015 unsigned long r_symndx
)
1017 unsigned int from_type
= *r_type
;
1018 unsigned int to_type
= from_type
;
1019 bfd_boolean check
= TRUE
;
1021 /* Skip TLS transition for functions. */
1023 && (h
->type
== STT_FUNC
1024 || h
->type
== STT_GNU_IFUNC
))
1029 case R_X86_64_TLSGD
:
1030 case R_X86_64_GOTPC32_TLSDESC
:
1031 case R_X86_64_TLSDESC_CALL
:
1032 case R_X86_64_GOTTPOFF
:
1033 if (info
->executable
)
1036 to_type
= R_X86_64_TPOFF32
;
1038 to_type
= R_X86_64_GOTTPOFF
;
1041 /* When we are called from elf_x86_64_relocate_section,
1042 CONTENTS isn't NULL and there may be additional transitions
1043 based on TLS_TYPE. */
1044 if (contents
!= NULL
)
1046 unsigned int new_to_type
= to_type
;
1048 if (info
->executable
1051 && tls_type
== GOT_TLS_IE
)
1052 new_to_type
= R_X86_64_TPOFF32
;
1054 if (to_type
== R_X86_64_TLSGD
1055 || to_type
== R_X86_64_GOTPC32_TLSDESC
1056 || to_type
== R_X86_64_TLSDESC_CALL
)
1058 if (tls_type
== GOT_TLS_IE
)
1059 new_to_type
= R_X86_64_GOTTPOFF
;
1062 /* We checked the transition before when we were called from
1063 elf_x86_64_check_relocs. We only want to check the new
1064 transition which hasn't been checked before. */
1065 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1066 to_type
= new_to_type
;
1071 case R_X86_64_TLSLD
:
1072 if (info
->executable
)
1073 to_type
= R_X86_64_TPOFF32
;
1080 /* Return TRUE if there is no transition. */
1081 if (from_type
== to_type
)
1084 /* Check if the transition can be performed. */
1086 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1087 symtab_hdr
, sym_hashes
,
1088 from_type
, rel
, relend
))
1090 reloc_howto_type
*from
, *to
;
1093 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1094 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1097 name
= h
->root
.root
.string
;
1100 struct elf_x86_64_link_hash_table
*htab
;
1102 htab
= elf_x86_64_hash_table (info
);
1107 Elf_Internal_Sym
*isym
;
1109 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1111 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1115 (*_bfd_error_handler
)
1116 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1117 "in section `%A' failed"),
1118 abfd
, sec
, from
->name
, to
->name
, name
,
1119 (unsigned long) rel
->r_offset
);
1120 bfd_set_error (bfd_error_bad_value
);
1128 /* Look through the relocs for a section during the first phase, and
1129 calculate needed space in the global offset table, procedure
1130 linkage table, and dynamic reloc sections. */
1133 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1135 const Elf_Internal_Rela
*relocs
)
1137 struct elf_x86_64_link_hash_table
*htab
;
1138 Elf_Internal_Shdr
*symtab_hdr
;
1139 struct elf_link_hash_entry
**sym_hashes
;
1140 const Elf_Internal_Rela
*rel
;
1141 const Elf_Internal_Rela
*rel_end
;
1144 if (info
->relocatable
)
1147 BFD_ASSERT (is_x86_64_elf (abfd
));
1149 htab
= elf_x86_64_hash_table (info
);
1153 symtab_hdr
= &elf_symtab_hdr (abfd
);
1154 sym_hashes
= elf_sym_hashes (abfd
);
1158 rel_end
= relocs
+ sec
->reloc_count
;
1159 for (rel
= relocs
; rel
< rel_end
; rel
++)
1161 unsigned int r_type
;
1162 unsigned long r_symndx
;
1163 struct elf_link_hash_entry
*h
;
1164 Elf_Internal_Sym
*isym
;
1167 r_symndx
= htab
->r_sym (rel
->r_info
);
1168 r_type
= ELF32_R_TYPE (rel
->r_info
);
1170 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1172 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1177 if (r_symndx
< symtab_hdr
->sh_info
)
1179 /* A local symbol. */
1180 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1185 /* Check relocation against local STT_GNU_IFUNC symbol. */
1186 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1188 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1193 /* Fake a STT_GNU_IFUNC symbol. */
1194 h
->type
= STT_GNU_IFUNC
;
1197 h
->forced_local
= 1;
1198 h
->root
.type
= bfd_link_hash_defined
;
1206 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1207 while (h
->root
.type
== bfd_link_hash_indirect
1208 || h
->root
.type
== bfd_link_hash_warning
)
1209 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1212 /* Check invalid x32 relocations. */
1213 if (!ABI_64_P (abfd
))
1220 case R_X86_64_DTPOFF64
:
1221 case R_X86_64_TPOFF64
:
1223 case R_X86_64_GOTOFF64
:
1224 case R_X86_64_GOT64
:
1225 case R_X86_64_GOTPCREL64
:
1226 case R_X86_64_GOTPC64
:
1227 case R_X86_64_GOTPLT64
:
1228 case R_X86_64_PLTOFF64
:
1231 name
= h
->root
.root
.string
;
1233 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1235 (*_bfd_error_handler
)
1236 (_("%B: relocation %s against symbol `%s' isn't "
1237 "supported in x32 mode"), abfd
,
1238 x86_64_elf_howto_table
[r_type
].name
, name
);
1239 bfd_set_error (bfd_error_bad_value
);
1247 /* Create the ifunc sections for static executables. If we
1248 never see an indirect function symbol nor we are building
1249 a static executable, those sections will be empty and
1250 won't appear in output. */
1261 case R_X86_64_PLT32
:
1262 case R_X86_64_GOTPCREL
:
1263 case R_X86_64_GOTPCREL64
:
1264 if (!_bfd_elf_create_ifunc_sections (abfd
, info
))
1269 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1270 it here if it is defined in a non-shared object. */
1271 if (h
->type
== STT_GNU_IFUNC
1274 /* It is referenced by a non-shared object. */
1278 /* STT_GNU_IFUNC symbol must go through PLT. */
1279 h
->plt
.refcount
+= 1;
1281 /* STT_GNU_IFUNC needs dynamic sections. */
1282 if (htab
->elf
.dynobj
== NULL
)
1283 htab
->elf
.dynobj
= abfd
;
1288 if (h
->root
.root
.string
)
1289 name
= h
->root
.root
.string
;
1291 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1293 (*_bfd_error_handler
)
1294 (_("%B: relocation %s against STT_GNU_IFUNC "
1295 "symbol `%s' isn't handled by %s"), abfd
,
1296 x86_64_elf_howto_table
[r_type
].name
,
1297 name
, __FUNCTION__
);
1298 bfd_set_error (bfd_error_bad_value
);
1302 if (ABI_64_P (abfd
))
1306 h
->pointer_equality_needed
= 1;
1309 /* We must copy these reloc types into the output
1310 file. Create a reloc section in dynobj and
1311 make room for this reloc. */
1312 sreloc
= _bfd_elf_create_ifunc_dyn_reloc
1313 (abfd
, info
, sec
, sreloc
,
1314 &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
);
1325 if (r_type
!= R_X86_64_PC32
1326 && r_type
!= R_X86_64_PC64
)
1327 h
->pointer_equality_needed
= 1;
1330 case R_X86_64_PLT32
:
1333 case R_X86_64_GOTPCREL
:
1334 case R_X86_64_GOTPCREL64
:
1335 h
->got
.refcount
+= 1;
1336 if (htab
->elf
.sgot
== NULL
1337 && !_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1347 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1348 symtab_hdr
, sym_hashes
,
1349 &r_type
, GOT_UNKNOWN
,
1350 rel
, rel_end
, h
, r_symndx
))
1355 case R_X86_64_TLSLD
:
1356 htab
->tls_ld_got
.refcount
+= 1;
1359 case R_X86_64_TPOFF32
:
1360 if (!info
->executable
&& ABI_64_P (abfd
))
1363 name
= h
->root
.root
.string
;
1365 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1367 (*_bfd_error_handler
)
1368 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1370 x86_64_elf_howto_table
[r_type
].name
, name
);
1371 bfd_set_error (bfd_error_bad_value
);
1376 case R_X86_64_GOTTPOFF
:
1377 if (!info
->executable
)
1378 info
->flags
|= DF_STATIC_TLS
;
1381 case R_X86_64_GOT32
:
1382 case R_X86_64_GOTPCREL
:
1383 case R_X86_64_TLSGD
:
1384 case R_X86_64_GOT64
:
1385 case R_X86_64_GOTPCREL64
:
1386 case R_X86_64_GOTPLT64
:
1387 case R_X86_64_GOTPC32_TLSDESC
:
1388 case R_X86_64_TLSDESC_CALL
:
1389 /* This symbol requires a global offset table entry. */
1391 int tls_type
, old_tls_type
;
1395 default: tls_type
= GOT_NORMAL
; break;
1396 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1397 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1398 case R_X86_64_GOTPC32_TLSDESC
:
1399 case R_X86_64_TLSDESC_CALL
:
1400 tls_type
= GOT_TLS_GDESC
; break;
1405 if (r_type
== R_X86_64_GOTPLT64
)
1407 /* This relocation indicates that we also need
1408 a PLT entry, as this is a function. We don't need
1409 a PLT entry for local symbols. */
1411 h
->plt
.refcount
+= 1;
1413 h
->got
.refcount
+= 1;
1414 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1418 bfd_signed_vma
*local_got_refcounts
;
1420 /* This is a global offset table entry for a local symbol. */
1421 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1422 if (local_got_refcounts
== NULL
)
1426 size
= symtab_hdr
->sh_info
;
1427 size
*= sizeof (bfd_signed_vma
)
1428 + sizeof (bfd_vma
) + sizeof (char);
1429 local_got_refcounts
= ((bfd_signed_vma
*)
1430 bfd_zalloc (abfd
, size
));
1431 if (local_got_refcounts
== NULL
)
1433 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1434 elf_x86_64_local_tlsdesc_gotent (abfd
)
1435 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1436 elf_x86_64_local_got_tls_type (abfd
)
1437 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1439 local_got_refcounts
[r_symndx
] += 1;
1441 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1444 /* If a TLS symbol is accessed using IE at least once,
1445 there is no point to use dynamic model for it. */
1446 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1447 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1448 || tls_type
!= GOT_TLS_IE
))
1450 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1451 tls_type
= old_tls_type
;
1452 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1453 && GOT_TLS_GD_ANY_P (tls_type
))
1454 tls_type
|= old_tls_type
;
1458 name
= h
->root
.root
.string
;
1460 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1462 (*_bfd_error_handler
)
1463 (_("%B: '%s' accessed both as normal and thread local symbol"),
1469 if (old_tls_type
!= tls_type
)
1472 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1474 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1479 case R_X86_64_GOTOFF64
:
1480 case R_X86_64_GOTPC32
:
1481 case R_X86_64_GOTPC64
:
1483 if (htab
->elf
.sgot
== NULL
)
1485 if (htab
->elf
.dynobj
== NULL
)
1486 htab
->elf
.dynobj
= abfd
;
1487 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1493 case R_X86_64_PLT32
:
1494 /* This symbol requires a procedure linkage table entry. We
1495 actually build the entry in adjust_dynamic_symbol,
1496 because this might be a case of linking PIC code which is
1497 never referenced by a dynamic object, in which case we
1498 don't need to generate a procedure linkage table entry
1501 /* If this is a local symbol, we resolve it directly without
1502 creating a procedure linkage table entry. */
1507 h
->plt
.refcount
+= 1;
1510 case R_X86_64_PLTOFF64
:
1511 /* This tries to form the 'address' of a function relative
1512 to GOT. For global symbols we need a PLT entry. */
1516 h
->plt
.refcount
+= 1;
1521 if (!ABI_64_P (abfd
))
1526 /* Let's help debug shared library creation. These relocs
1527 cannot be used in shared libs. Don't error out for
1528 sections we don't care about, such as debug sections or
1529 non-constant sections. */
1531 && (sec
->flags
& SEC_ALLOC
) != 0
1532 && (sec
->flags
& SEC_READONLY
) != 0)
1535 name
= h
->root
.root
.string
;
1537 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1538 (*_bfd_error_handler
)
1539 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1540 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1541 bfd_set_error (bfd_error_bad_value
);
1552 if (h
!= NULL
&& info
->executable
)
1554 /* If this reloc is in a read-only section, we might
1555 need a copy reloc. We can't check reliably at this
1556 stage whether the section is read-only, as input
1557 sections have not yet been mapped to output sections.
1558 Tentatively set the flag for now, and correct in
1559 adjust_dynamic_symbol. */
1562 /* We may need a .plt entry if the function this reloc
1563 refers to is in a shared lib. */
1564 h
->plt
.refcount
+= 1;
1565 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1566 h
->pointer_equality_needed
= 1;
1569 /* If we are creating a shared library, and this is a reloc
1570 against a global symbol, or a non PC relative reloc
1571 against a local symbol, then we need to copy the reloc
1572 into the shared library. However, if we are linking with
1573 -Bsymbolic, we do not need to copy a reloc against a
1574 global symbol which is defined in an object we are
1575 including in the link (i.e., DEF_REGULAR is set). At
1576 this point we have not seen all the input files, so it is
1577 possible that DEF_REGULAR is not set now but will be set
1578 later (it is never cleared). In case of a weak definition,
1579 DEF_REGULAR may be cleared later by a strong definition in
1580 a shared library. We account for that possibility below by
1581 storing information in the relocs_copied field of the hash
1582 table entry. A similar situation occurs when creating
1583 shared libraries and symbol visibility changes render the
1586 If on the other hand, we are creating an executable, we
1587 may need to keep relocations for symbols satisfied by a
1588 dynamic library if we manage to avoid copy relocs for the
1591 && (sec
->flags
& SEC_ALLOC
) != 0
1592 && (! IS_X86_64_PCREL_TYPE (r_type
)
1594 && (! SYMBOLIC_BIND (info
, h
)
1595 || h
->root
.type
== bfd_link_hash_defweak
1596 || !h
->def_regular
))))
1597 || (ELIMINATE_COPY_RELOCS
1599 && (sec
->flags
& SEC_ALLOC
) != 0
1601 && (h
->root
.type
== bfd_link_hash_defweak
1602 || !h
->def_regular
)))
1604 struct elf_dyn_relocs
*p
;
1605 struct elf_dyn_relocs
**head
;
1607 /* We must copy these reloc types into the output file.
1608 Create a reloc section in dynobj and make room for
1612 if (htab
->elf
.dynobj
== NULL
)
1613 htab
->elf
.dynobj
= abfd
;
1615 sreloc
= _bfd_elf_make_dynamic_reloc_section
1616 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
1617 abfd
, /*rela?*/ TRUE
);
1623 /* If this is a global symbol, we count the number of
1624 relocations we need for this symbol. */
1627 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1631 /* Track dynamic relocs needed for local syms too.
1632 We really need local syms available to do this
1637 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1642 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1646 /* Beware of type punned pointers vs strict aliasing
1648 vpp
= &(elf_section_data (s
)->local_dynrel
);
1649 head
= (struct elf_dyn_relocs
**)vpp
;
1653 if (p
== NULL
|| p
->sec
!= sec
)
1655 bfd_size_type amt
= sizeof *p
;
1657 p
= ((struct elf_dyn_relocs
*)
1658 bfd_alloc (htab
->elf
.dynobj
, amt
));
1669 if (IS_X86_64_PCREL_TYPE (r_type
))
1674 /* This relocation describes the C++ object vtable hierarchy.
1675 Reconstruct it for later use during GC. */
1676 case R_X86_64_GNU_VTINHERIT
:
1677 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1681 /* This relocation describes which C++ vtable entries are actually
1682 used. Record for later use during GC. */
1683 case R_X86_64_GNU_VTENTRY
:
1684 BFD_ASSERT (h
!= NULL
);
1686 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1698 /* Return the section that should be marked against GC for a given
1702 elf_x86_64_gc_mark_hook (asection
*sec
,
1703 struct bfd_link_info
*info
,
1704 Elf_Internal_Rela
*rel
,
1705 struct elf_link_hash_entry
*h
,
1706 Elf_Internal_Sym
*sym
)
1709 switch (ELF32_R_TYPE (rel
->r_info
))
1711 case R_X86_64_GNU_VTINHERIT
:
1712 case R_X86_64_GNU_VTENTRY
:
1716 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1719 /* Update the got entry reference counts for the section being removed. */
1722 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1724 const Elf_Internal_Rela
*relocs
)
1726 struct elf_x86_64_link_hash_table
*htab
;
1727 Elf_Internal_Shdr
*symtab_hdr
;
1728 struct elf_link_hash_entry
**sym_hashes
;
1729 bfd_signed_vma
*local_got_refcounts
;
1730 const Elf_Internal_Rela
*rel
, *relend
;
1732 if (info
->relocatable
)
1735 htab
= elf_x86_64_hash_table (info
);
1739 elf_section_data (sec
)->local_dynrel
= NULL
;
1741 symtab_hdr
= &elf_symtab_hdr (abfd
);
1742 sym_hashes
= elf_sym_hashes (abfd
);
1743 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1745 htab
= elf_x86_64_hash_table (info
);
1746 relend
= relocs
+ sec
->reloc_count
;
1747 for (rel
= relocs
; rel
< relend
; rel
++)
1749 unsigned long r_symndx
;
1750 unsigned int r_type
;
1751 struct elf_link_hash_entry
*h
= NULL
;
1753 r_symndx
= htab
->r_sym (rel
->r_info
);
1754 if (r_symndx
>= symtab_hdr
->sh_info
)
1756 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1757 while (h
->root
.type
== bfd_link_hash_indirect
1758 || h
->root
.type
== bfd_link_hash_warning
)
1759 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1763 /* A local symbol. */
1764 Elf_Internal_Sym
*isym
;
1766 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1769 /* Check relocation against local STT_GNU_IFUNC symbol. */
1771 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1773 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
1781 struct elf_x86_64_link_hash_entry
*eh
;
1782 struct elf_dyn_relocs
**pp
;
1783 struct elf_dyn_relocs
*p
;
1785 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
1787 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1790 /* Everything must go for SEC. */
1796 r_type
= ELF32_R_TYPE (rel
->r_info
);
1797 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1798 symtab_hdr
, sym_hashes
,
1799 &r_type
, GOT_UNKNOWN
,
1800 rel
, relend
, h
, r_symndx
))
1805 case R_X86_64_TLSLD
:
1806 if (htab
->tls_ld_got
.refcount
> 0)
1807 htab
->tls_ld_got
.refcount
-= 1;
1810 case R_X86_64_TLSGD
:
1811 case R_X86_64_GOTPC32_TLSDESC
:
1812 case R_X86_64_TLSDESC_CALL
:
1813 case R_X86_64_GOTTPOFF
:
1814 case R_X86_64_GOT32
:
1815 case R_X86_64_GOTPCREL
:
1816 case R_X86_64_GOT64
:
1817 case R_X86_64_GOTPCREL64
:
1818 case R_X86_64_GOTPLT64
:
1821 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1822 h
->plt
.refcount
-= 1;
1823 if (h
->got
.refcount
> 0)
1824 h
->got
.refcount
-= 1;
1825 if (h
->type
== STT_GNU_IFUNC
)
1827 if (h
->plt
.refcount
> 0)
1828 h
->plt
.refcount
-= 1;
1831 else if (local_got_refcounts
!= NULL
)
1833 if (local_got_refcounts
[r_symndx
] > 0)
1834 local_got_refcounts
[r_symndx
] -= 1;
1848 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
1852 case R_X86_64_PLT32
:
1853 case R_X86_64_PLTOFF64
:
1856 if (h
->plt
.refcount
> 0)
1857 h
->plt
.refcount
-= 1;
1869 /* Adjust a symbol defined by a dynamic object and referenced by a
1870 regular object. The current definition is in some section of the
1871 dynamic object, but we're not including those sections. We have to
1872 change the definition to something the rest of the link can
1876 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1877 struct elf_link_hash_entry
*h
)
1879 struct elf_x86_64_link_hash_table
*htab
;
1882 /* STT_GNU_IFUNC symbol must go through PLT. */
1883 if (h
->type
== STT_GNU_IFUNC
)
1885 if (h
->plt
.refcount
<= 0)
1887 h
->plt
.offset
= (bfd_vma
) -1;
1893 /* If this is a function, put it in the procedure linkage table. We
1894 will fill in the contents of the procedure linkage table later,
1895 when we know the address of the .got section. */
1896 if (h
->type
== STT_FUNC
1899 if (h
->plt
.refcount
<= 0
1900 || SYMBOL_CALLS_LOCAL (info
, h
)
1901 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1902 && h
->root
.type
== bfd_link_hash_undefweak
))
1904 /* This case can occur if we saw a PLT32 reloc in an input
1905 file, but the symbol was never referred to by a dynamic
1906 object, or if all references were garbage collected. In
1907 such a case, we don't actually need to build a procedure
1908 linkage table, and we can just do a PC32 reloc instead. */
1909 h
->plt
.offset
= (bfd_vma
) -1;
1916 /* It's possible that we incorrectly decided a .plt reloc was
1917 needed for an R_X86_64_PC32 reloc to a non-function sym in
1918 check_relocs. We can't decide accurately between function and
1919 non-function syms in check-relocs; Objects loaded later in
1920 the link may change h->type. So fix it now. */
1921 h
->plt
.offset
= (bfd_vma
) -1;
1923 /* If this is a weak symbol, and there is a real definition, the
1924 processor independent code will have arranged for us to see the
1925 real definition first, and we can just use the same value. */
1926 if (h
->u
.weakdef
!= NULL
)
1928 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1929 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1930 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1931 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1932 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1933 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1937 /* This is a reference to a symbol defined by a dynamic object which
1938 is not a function. */
1940 /* If we are creating a shared library, we must presume that the
1941 only references to the symbol are via the global offset table.
1942 For such cases we need not do anything here; the relocations will
1943 be handled correctly by relocate_section. */
1947 /* If there are no references to this symbol that do not use the
1948 GOT, we don't need to generate a copy reloc. */
1949 if (!h
->non_got_ref
)
1952 /* If -z nocopyreloc was given, we won't generate them either. */
1953 if (info
->nocopyreloc
)
1959 if (ELIMINATE_COPY_RELOCS
)
1961 struct elf_x86_64_link_hash_entry
* eh
;
1962 struct elf_dyn_relocs
*p
;
1964 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
1965 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1967 s
= p
->sec
->output_section
;
1968 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1972 /* If we didn't find any dynamic relocs in read-only sections, then
1973 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1983 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1984 h
->root
.root
.string
);
1988 /* We must allocate the symbol in our .dynbss section, which will
1989 become part of the .bss section of the executable. There will be
1990 an entry for this symbol in the .dynsym section. The dynamic
1991 object will contain position independent code, so all references
1992 from the dynamic object to this symbol will go through the global
1993 offset table. The dynamic linker will use the .dynsym entry to
1994 determine the address it must put in the global offset table, so
1995 both the dynamic object and the regular object will refer to the
1996 same memory location for the variable. */
1998 htab
= elf_x86_64_hash_table (info
);
2002 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2003 to copy the initial value out of the dynamic object and into the
2004 runtime process image. */
2005 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
2007 const struct elf_backend_data
*bed
;
2008 bed
= get_elf_backend_data (info
->output_bfd
);
2009 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
2015 return _bfd_elf_adjust_dynamic_copy (h
, s
);
2018 /* Allocate space in .plt, .got and associated reloc sections for
2022 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
2024 struct bfd_link_info
*info
;
2025 struct elf_x86_64_link_hash_table
*htab
;
2026 struct elf_x86_64_link_hash_entry
*eh
;
2027 struct elf_dyn_relocs
*p
;
2028 const struct elf_backend_data
*bed
;
2030 if (h
->root
.type
== bfd_link_hash_indirect
)
2033 if (h
->root
.type
== bfd_link_hash_warning
)
2034 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2035 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2037 info
= (struct bfd_link_info
*) inf
;
2038 htab
= elf_x86_64_hash_table (info
);
2041 bed
= get_elf_backend_data (info
->output_bfd
);
2043 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2044 here if it is defined and referenced in a non-shared object. */
2045 if (h
->type
== STT_GNU_IFUNC
2047 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2051 else if (htab
->elf
.dynamic_sections_created
2052 && h
->plt
.refcount
> 0)
2054 /* Make sure this symbol is output as a dynamic symbol.
2055 Undefined weak syms won't yet be marked as dynamic. */
2056 if (h
->dynindx
== -1
2057 && !h
->forced_local
)
2059 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2064 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2066 asection
*s
= htab
->elf
.splt
;
2068 /* If this is the first .plt entry, make room for the special
2071 s
->size
+= PLT_ENTRY_SIZE
;
2073 h
->plt
.offset
= s
->size
;
2075 /* If this symbol is not defined in a regular file, and we are
2076 not generating a shared library, then set the symbol to this
2077 location in the .plt. This is required to make function
2078 pointers compare as equal between the normal executable and
2079 the shared library. */
2083 h
->root
.u
.def
.section
= s
;
2084 h
->root
.u
.def
.value
= h
->plt
.offset
;
2087 /* Make room for this entry. */
2088 s
->size
+= PLT_ENTRY_SIZE
;
2090 /* We also need to make an entry in the .got.plt section, which
2091 will be placed in the .got section by the linker script. */
2092 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2094 /* We also need to make an entry in the .rela.plt section. */
2095 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2096 htab
->elf
.srelplt
->reloc_count
++;
2100 h
->plt
.offset
= (bfd_vma
) -1;
2106 h
->plt
.offset
= (bfd_vma
) -1;
2110 eh
->tlsdesc_got
= (bfd_vma
) -1;
2112 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2113 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2114 if (h
->got
.refcount
> 0
2117 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2119 h
->got
.offset
= (bfd_vma
) -1;
2121 else if (h
->got
.refcount
> 0)
2125 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2127 /* Make sure this symbol is output as a dynamic symbol.
2128 Undefined weak syms won't yet be marked as dynamic. */
2129 if (h
->dynindx
== -1
2130 && !h
->forced_local
)
2132 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2136 if (GOT_TLS_GDESC_P (tls_type
))
2138 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2139 - elf_x86_64_compute_jump_table_size (htab
);
2140 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2141 h
->got
.offset
= (bfd_vma
) -2;
2143 if (! GOT_TLS_GDESC_P (tls_type
)
2144 || GOT_TLS_GD_P (tls_type
))
2147 h
->got
.offset
= s
->size
;
2148 s
->size
+= GOT_ENTRY_SIZE
;
2149 if (GOT_TLS_GD_P (tls_type
))
2150 s
->size
+= GOT_ENTRY_SIZE
;
2152 dyn
= htab
->elf
.dynamic_sections_created
;
2153 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2155 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2156 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2157 || tls_type
== GOT_TLS_IE
)
2158 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2159 else if (GOT_TLS_GD_P (tls_type
))
2160 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2161 else if (! GOT_TLS_GDESC_P (tls_type
)
2162 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2163 || h
->root
.type
!= bfd_link_hash_undefweak
)
2165 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2166 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2167 if (GOT_TLS_GDESC_P (tls_type
))
2169 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2170 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2174 h
->got
.offset
= (bfd_vma
) -1;
2176 if (eh
->dyn_relocs
== NULL
)
2179 /* In the shared -Bsymbolic case, discard space allocated for
2180 dynamic pc-relative relocs against symbols which turn out to be
2181 defined in regular objects. For the normal shared case, discard
2182 space for pc-relative relocs that have become local due to symbol
2183 visibility changes. */
2187 /* Relocs that use pc_count are those that appear on a call
2188 insn, or certain REL relocs that can generated via assembly.
2189 We want calls to protected symbols to resolve directly to the
2190 function rather than going via the plt. If people want
2191 function pointer comparisons to work as expected then they
2192 should avoid writing weird assembly. */
2193 if (SYMBOL_CALLS_LOCAL (info
, h
))
2195 struct elf_dyn_relocs
**pp
;
2197 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2199 p
->count
-= p
->pc_count
;
2208 /* Also discard relocs on undefined weak syms with non-default
2210 if (eh
->dyn_relocs
!= NULL
2211 && h
->root
.type
== bfd_link_hash_undefweak
)
2213 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2214 eh
->dyn_relocs
= NULL
;
2216 /* Make sure undefined weak symbols are output as a dynamic
2218 else if (h
->dynindx
== -1
2219 && ! h
->forced_local
2220 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2225 else if (ELIMINATE_COPY_RELOCS
)
2227 /* For the non-shared case, discard space for relocs against
2228 symbols which turn out to need copy relocs or are not
2234 || (htab
->elf
.dynamic_sections_created
2235 && (h
->root
.type
== bfd_link_hash_undefweak
2236 || h
->root
.type
== bfd_link_hash_undefined
))))
2238 /* Make sure this symbol is output as a dynamic symbol.
2239 Undefined weak syms won't yet be marked as dynamic. */
2240 if (h
->dynindx
== -1
2241 && ! h
->forced_local
2242 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2245 /* If that succeeded, we know we'll be keeping all the
2247 if (h
->dynindx
!= -1)
2251 eh
->dyn_relocs
= NULL
;
2256 /* Finally, allocate space. */
2257 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2261 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2263 BFD_ASSERT (sreloc
!= NULL
);
2265 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2271 /* Allocate space in .plt, .got and associated reloc sections for
2272 local dynamic relocs. */
2275 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2277 struct elf_link_hash_entry
*h
2278 = (struct elf_link_hash_entry
*) *slot
;
2280 if (h
->type
!= STT_GNU_IFUNC
2284 || h
->root
.type
!= bfd_link_hash_defined
)
2287 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2290 /* Find any dynamic relocs that apply to read-only sections. */
2293 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2296 struct elf_x86_64_link_hash_entry
*eh
;
2297 struct elf_dyn_relocs
*p
;
2299 if (h
->root
.type
== bfd_link_hash_warning
)
2300 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2302 /* Skip local IFUNC symbols. */
2303 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
2306 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2307 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2309 asection
*s
= p
->sec
->output_section
;
2311 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2313 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2315 info
->flags
|= DF_TEXTREL
;
2317 /* Not an error, just cut short the traversal. */
2324 /* Set the sizes of the dynamic sections. */
2327 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
2328 struct bfd_link_info
*info
)
2330 struct elf_x86_64_link_hash_table
*htab
;
2335 const struct elf_backend_data
*bed
;
2337 htab
= elf_x86_64_hash_table (info
);
2340 bed
= get_elf_backend_data (output_bfd
);
2342 dynobj
= htab
->elf
.dynobj
;
2346 if (htab
->elf
.dynamic_sections_created
)
2348 /* Set the contents of the .interp section to the interpreter. */
2349 if (info
->executable
)
2351 s
= bfd_get_section_by_name (dynobj
, ".interp");
2354 s
->size
= htab
->dynamic_interpreter_size
;
2355 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2359 /* Set up .got offsets for local syms, and space for local dynamic
2361 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2363 bfd_signed_vma
*local_got
;
2364 bfd_signed_vma
*end_local_got
;
2365 char *local_tls_type
;
2366 bfd_vma
*local_tlsdesc_gotent
;
2367 bfd_size_type locsymcount
;
2368 Elf_Internal_Shdr
*symtab_hdr
;
2371 if (! is_x86_64_elf (ibfd
))
2374 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2376 struct elf_dyn_relocs
*p
;
2378 for (p
= (struct elf_dyn_relocs
*)
2379 (elf_section_data (s
)->local_dynrel
);
2383 if (!bfd_is_abs_section (p
->sec
)
2384 && bfd_is_abs_section (p
->sec
->output_section
))
2386 /* Input section has been discarded, either because
2387 it is a copy of a linkonce section or due to
2388 linker script /DISCARD/, so we'll be discarding
2391 else if (p
->count
!= 0)
2393 srel
= elf_section_data (p
->sec
)->sreloc
;
2394 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2395 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2396 info
->flags
|= DF_TEXTREL
;
2401 local_got
= elf_local_got_refcounts (ibfd
);
2405 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2406 locsymcount
= symtab_hdr
->sh_info
;
2407 end_local_got
= local_got
+ locsymcount
;
2408 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
2409 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
2411 srel
= htab
->elf
.srelgot
;
2412 for (; local_got
< end_local_got
;
2413 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2415 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2418 if (GOT_TLS_GDESC_P (*local_tls_type
))
2420 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2421 - elf_x86_64_compute_jump_table_size (htab
);
2422 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2423 *local_got
= (bfd_vma
) -2;
2425 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2426 || GOT_TLS_GD_P (*local_tls_type
))
2428 *local_got
= s
->size
;
2429 s
->size
+= GOT_ENTRY_SIZE
;
2430 if (GOT_TLS_GD_P (*local_tls_type
))
2431 s
->size
+= GOT_ENTRY_SIZE
;
2434 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2435 || *local_tls_type
== GOT_TLS_IE
)
2437 if (GOT_TLS_GDESC_P (*local_tls_type
))
2439 htab
->elf
.srelplt
->size
2440 += bed
->s
->sizeof_rela
;
2441 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2443 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2444 || GOT_TLS_GD_P (*local_tls_type
))
2445 srel
->size
+= bed
->s
->sizeof_rela
;
2449 *local_got
= (bfd_vma
) -1;
2453 if (htab
->tls_ld_got
.refcount
> 0)
2455 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2457 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2458 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2459 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2462 htab
->tls_ld_got
.offset
= -1;
2464 /* Allocate global sym .plt and .got entries, and space for global
2465 sym dynamic relocs. */
2466 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
2469 /* Allocate .plt and .got entries, and space for local symbols. */
2470 htab_traverse (htab
->loc_hash_table
,
2471 elf_x86_64_allocate_local_dynrelocs
,
2474 /* For every jump slot reserved in the sgotplt, reloc_count is
2475 incremented. However, when we reserve space for TLS descriptors,
2476 it's not incremented, so in order to compute the space reserved
2477 for them, it suffices to multiply the reloc count by the jump
2479 if (htab
->elf
.srelplt
)
2480 htab
->sgotplt_jump_table_size
2481 = elf_x86_64_compute_jump_table_size (htab
);
2483 if (htab
->tlsdesc_plt
)
2485 /* If we're not using lazy TLS relocations, don't generate the
2486 PLT and GOT entries they require. */
2487 if ((info
->flags
& DF_BIND_NOW
))
2488 htab
->tlsdesc_plt
= 0;
2491 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2492 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2493 /* Reserve room for the initial entry.
2494 FIXME: we could probably do away with it in this case. */
2495 if (htab
->elf
.splt
->size
== 0)
2496 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2497 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2498 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2502 if (htab
->elf
.sgotplt
)
2504 struct elf_link_hash_entry
*got
;
2505 got
= elf_link_hash_lookup (elf_hash_table (info
),
2506 "_GLOBAL_OFFSET_TABLE_",
2507 FALSE
, FALSE
, FALSE
);
2509 /* Don't allocate .got.plt section if there are no GOT nor PLT
2510 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2512 || !got
->ref_regular_nonweak
)
2513 && (htab
->elf
.sgotplt
->size
2514 == get_elf_backend_data (output_bfd
)->got_header_size
)
2515 && (htab
->elf
.splt
== NULL
2516 || htab
->elf
.splt
->size
== 0)
2517 && (htab
->elf
.sgot
== NULL
2518 || htab
->elf
.sgot
->size
== 0)
2519 && (htab
->elf
.iplt
== NULL
2520 || htab
->elf
.iplt
->size
== 0)
2521 && (htab
->elf
.igotplt
== NULL
2522 || htab
->elf
.igotplt
->size
== 0))
2523 htab
->elf
.sgotplt
->size
= 0;
2526 /* We now have determined the sizes of the various dynamic sections.
2527 Allocate memory for them. */
2529 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2531 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2534 if (s
== htab
->elf
.splt
2535 || s
== htab
->elf
.sgot
2536 || s
== htab
->elf
.sgotplt
2537 || s
== htab
->elf
.iplt
2538 || s
== htab
->elf
.igotplt
2539 || s
== htab
->sdynbss
)
2541 /* Strip this section if we don't need it; see the
2544 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2546 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2549 /* We use the reloc_count field as a counter if we need
2550 to copy relocs into the output file. */
2551 if (s
!= htab
->elf
.srelplt
)
2556 /* It's not one of our sections, so don't allocate space. */
2562 /* If we don't need this section, strip it from the
2563 output file. This is mostly to handle .rela.bss and
2564 .rela.plt. We must create both sections in
2565 create_dynamic_sections, because they must be created
2566 before the linker maps input sections to output
2567 sections. The linker does that before
2568 adjust_dynamic_symbol is called, and it is that
2569 function which decides whether anything needs to go
2570 into these sections. */
2572 s
->flags
|= SEC_EXCLUDE
;
2576 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2579 /* Allocate memory for the section contents. We use bfd_zalloc
2580 here in case unused entries are not reclaimed before the
2581 section's contents are written out. This should not happen,
2582 but this way if it does, we get a R_X86_64_NONE reloc instead
2584 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2585 if (s
->contents
== NULL
)
2589 if (htab
->elf
.dynamic_sections_created
)
2591 /* Add some entries to the .dynamic section. We fill in the
2592 values later, in elf_x86_64_finish_dynamic_sections, but we
2593 must add the entries now so that we get the correct size for
2594 the .dynamic section. The DT_DEBUG entry is filled in by the
2595 dynamic linker and used by the debugger. */
2596 #define add_dynamic_entry(TAG, VAL) \
2597 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2599 if (info
->executable
)
2601 if (!add_dynamic_entry (DT_DEBUG
, 0))
2605 if (htab
->elf
.splt
->size
!= 0)
2607 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2608 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2609 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2610 || !add_dynamic_entry (DT_JMPREL
, 0))
2613 if (htab
->tlsdesc_plt
2614 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2615 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2621 if (!add_dynamic_entry (DT_RELA
, 0)
2622 || !add_dynamic_entry (DT_RELASZ
, 0)
2623 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
2626 /* If any dynamic relocs apply to a read-only section,
2627 then we need a DT_TEXTREL entry. */
2628 if ((info
->flags
& DF_TEXTREL
) == 0)
2629 elf_link_hash_traverse (&htab
->elf
,
2630 elf_x86_64_readonly_dynrelocs
,
2633 if ((info
->flags
& DF_TEXTREL
) != 0)
2635 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2640 #undef add_dynamic_entry
2646 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2647 struct bfd_link_info
*info
)
2649 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2653 struct elf_link_hash_entry
*tlsbase
;
2655 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2656 "_TLS_MODULE_BASE_",
2657 FALSE
, FALSE
, FALSE
);
2659 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2661 struct elf_x86_64_link_hash_table
*htab
;
2662 struct bfd_link_hash_entry
*bh
= NULL
;
2663 const struct elf_backend_data
*bed
2664 = get_elf_backend_data (output_bfd
);
2666 htab
= elf_x86_64_hash_table (info
);
2670 if (!(_bfd_generic_link_add_one_symbol
2671 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2672 tls_sec
, 0, NULL
, FALSE
,
2673 bed
->collect
, &bh
)))
2676 htab
->tls_module_base
= bh
;
2678 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2679 tlsbase
->def_regular
= 1;
2680 tlsbase
->other
= STV_HIDDEN
;
2681 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2688 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2689 executables. Rather than setting it to the beginning of the TLS
2690 section, we have to set it to the end. This function may be called
2691 multiple times, it is idempotent. */
2694 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2696 struct elf_x86_64_link_hash_table
*htab
;
2697 struct bfd_link_hash_entry
*base
;
2699 if (!info
->executable
)
2702 htab
= elf_x86_64_hash_table (info
);
2706 base
= htab
->tls_module_base
;
2710 base
->u
.def
.value
= htab
->elf
.tls_size
;
2713 /* Return the base VMA address which should be subtracted from real addresses
2714 when resolving @dtpoff relocation.
2715 This is PT_TLS segment p_vaddr. */
2718 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2720 /* If tls_sec is NULL, we should have signalled an error already. */
2721 if (elf_hash_table (info
)->tls_sec
== NULL
)
2723 return elf_hash_table (info
)->tls_sec
->vma
;
2726 /* Return the relocation value for @tpoff relocation
2727 if STT_TLS virtual address is ADDRESS. */
2730 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2732 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2733 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2734 bfd_vma static_tls_size
;
2736 /* If tls_segment is NULL, we should have signalled an error already. */
2737 if (htab
->tls_sec
== NULL
)
2740 /* Consider special static TLS alignment requirements. */
2741 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2742 return address
- static_tls_size
- htab
->tls_sec
->vma
;
2745 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2749 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2751 /* Opcode Instruction
2754 0x0f 0x8x conditional jump */
2756 && (contents
[offset
- 1] == 0xe8
2757 || contents
[offset
- 1] == 0xe9))
2759 && contents
[offset
- 2] == 0x0f
2760 && (contents
[offset
- 1] & 0xf0) == 0x80));
2763 /* Relocate an x86_64 ELF section. */
2766 elf_x86_64_relocate_section (bfd
*output_bfd
,
2767 struct bfd_link_info
*info
,
2769 asection
*input_section
,
2771 Elf_Internal_Rela
*relocs
,
2772 Elf_Internal_Sym
*local_syms
,
2773 asection
**local_sections
)
2775 struct elf_x86_64_link_hash_table
*htab
;
2776 Elf_Internal_Shdr
*symtab_hdr
;
2777 struct elf_link_hash_entry
**sym_hashes
;
2778 bfd_vma
*local_got_offsets
;
2779 bfd_vma
*local_tlsdesc_gotents
;
2780 Elf_Internal_Rela
*rel
;
2781 Elf_Internal_Rela
*relend
;
2783 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2785 htab
= elf_x86_64_hash_table (info
);
2788 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2789 sym_hashes
= elf_sym_hashes (input_bfd
);
2790 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2791 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
2793 elf_x86_64_set_tls_module_base (info
);
2796 relend
= relocs
+ input_section
->reloc_count
;
2797 for (; rel
< relend
; rel
++)
2799 unsigned int r_type
;
2800 reloc_howto_type
*howto
;
2801 unsigned long r_symndx
;
2802 struct elf_link_hash_entry
*h
;
2803 Elf_Internal_Sym
*sym
;
2805 bfd_vma off
, offplt
;
2807 bfd_boolean unresolved_reloc
;
2808 bfd_reloc_status_type r
;
2812 r_type
= ELF32_R_TYPE (rel
->r_info
);
2813 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2814 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2817 if (r_type
>= R_X86_64_max
)
2819 bfd_set_error (bfd_error_bad_value
);
2823 howto
= x86_64_elf_howto_table
+ r_type
;
2824 r_symndx
= htab
->r_sym (rel
->r_info
);
2828 unresolved_reloc
= FALSE
;
2829 if (r_symndx
< symtab_hdr
->sh_info
)
2831 sym
= local_syms
+ r_symndx
;
2832 sec
= local_sections
[r_symndx
];
2834 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2837 /* Relocate against local STT_GNU_IFUNC symbol. */
2838 if (!info
->relocatable
2839 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2841 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
2846 /* Set STT_GNU_IFUNC symbol value. */
2847 h
->root
.u
.def
.value
= sym
->st_value
;
2848 h
->root
.u
.def
.section
= sec
;
2853 bfd_boolean warned ATTRIBUTE_UNUSED
;
2855 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2856 r_symndx
, symtab_hdr
, sym_hashes
,
2858 unresolved_reloc
, warned
);
2861 if (sec
!= NULL
&& elf_discarded_section (sec
))
2862 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2863 rel
, relend
, howto
, contents
);
2865 if (info
->relocatable
)
2868 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2869 it here if it is defined in a non-shared object. */
2871 && h
->type
== STT_GNU_IFUNC
2878 if ((input_section
->flags
& SEC_ALLOC
) == 0
2879 || h
->plt
.offset
== (bfd_vma
) -1)
2882 /* STT_GNU_IFUNC symbol must go through PLT. */
2883 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
2884 relocation
= (plt
->output_section
->vma
2885 + plt
->output_offset
+ h
->plt
.offset
);
2890 if (h
->root
.root
.string
)
2891 name
= h
->root
.root
.string
;
2893 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2895 (*_bfd_error_handler
)
2896 (_("%B: relocation %s against STT_GNU_IFUNC "
2897 "symbol `%s' isn't handled by %s"), input_bfd
,
2898 x86_64_elf_howto_table
[r_type
].name
,
2899 name
, __FUNCTION__
);
2900 bfd_set_error (bfd_error_bad_value
);
2909 if (ABI_64_P (output_bfd
))
2913 if (rel
->r_addend
!= 0)
2915 if (h
->root
.root
.string
)
2916 name
= h
->root
.root
.string
;
2918 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2920 (*_bfd_error_handler
)
2921 (_("%B: relocation %s against STT_GNU_IFUNC "
2922 "symbol `%s' has non-zero addend: %d"),
2923 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2924 name
, rel
->r_addend
);
2925 bfd_set_error (bfd_error_bad_value
);
2929 /* Generate dynamic relcoation only when there is a
2930 non-GOF reference in a shared object. */
2931 if (info
->shared
&& h
->non_got_ref
)
2933 Elf_Internal_Rela outrel
;
2936 /* Need a dynamic relocation to get the real function
2938 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2942 if (outrel
.r_offset
== (bfd_vma
) -1
2943 || outrel
.r_offset
== (bfd_vma
) -2)
2946 outrel
.r_offset
+= (input_section
->output_section
->vma
2947 + input_section
->output_offset
);
2949 if (h
->dynindx
== -1
2951 || info
->executable
)
2953 /* This symbol is resolved locally. */
2954 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
2955 outrel
.r_addend
= (h
->root
.u
.def
.value
2956 + h
->root
.u
.def
.section
->output_section
->vma
2957 + h
->root
.u
.def
.section
->output_offset
);
2961 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
2962 outrel
.r_addend
= 0;
2965 sreloc
= htab
->elf
.irelifunc
;
2966 elf_append_rela (output_bfd
, sreloc
, &outrel
);
2968 /* If this reloc is against an external symbol, we
2969 do not want to fiddle with the addend. Otherwise,
2970 we need to include the symbol value so that it
2971 becomes an addend for the dynamic reloc. For an
2972 internal symbol, we have updated addend. */
2978 case R_X86_64_PLT32
:
2981 case R_X86_64_GOTPCREL
:
2982 case R_X86_64_GOTPCREL64
:
2983 base_got
= htab
->elf
.sgot
;
2984 off
= h
->got
.offset
;
2986 if (base_got
== NULL
)
2989 if (off
== (bfd_vma
) -1)
2991 /* We can't use h->got.offset here to save state, or
2992 even just remember the offset, as finish_dynamic_symbol
2993 would use that as offset into .got. */
2995 if (htab
->elf
.splt
!= NULL
)
2997 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2998 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2999 base_got
= htab
->elf
.sgotplt
;
3003 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3004 off
= plt_index
* GOT_ENTRY_SIZE
;
3005 base_got
= htab
->elf
.igotplt
;
3008 if (h
->dynindx
== -1
3012 /* This references the local defitionion. We must
3013 initialize this entry in the global offset table.
3014 Since the offset must always be a multiple of 8,
3015 we use the least significant bit to record
3016 whether we have initialized it already.
3018 When doing a dynamic link, we create a .rela.got
3019 relocation entry to initialize the value. This
3020 is done in the finish_dynamic_symbol routine. */
3025 bfd_put_64 (output_bfd
, relocation
,
3026 base_got
->contents
+ off
);
3027 /* Note that this is harmless for the GOTPLT64
3028 case, as -1 | 1 still is -1. */
3034 relocation
= (base_got
->output_section
->vma
3035 + base_got
->output_offset
+ off
);
3041 /* When generating a shared object, the relocations handled here are
3042 copied into the output file to be resolved at run time. */
3045 case R_X86_64_GOT32
:
3046 case R_X86_64_GOT64
:
3047 /* Relocation is to the entry for this symbol in the global
3049 case R_X86_64_GOTPCREL
:
3050 case R_X86_64_GOTPCREL64
:
3051 /* Use global offset table entry as symbol value. */
3052 case R_X86_64_GOTPLT64
:
3053 /* This is the same as GOT64 for relocation purposes, but
3054 indicates the existence of a PLT entry. The difficulty is,
3055 that we must calculate the GOT slot offset from the PLT
3056 offset, if this symbol got a PLT entry (it was global).
3057 Additionally if it's computed from the PLT entry, then that
3058 GOT offset is relative to .got.plt, not to .got. */
3059 base_got
= htab
->elf
.sgot
;
3061 if (htab
->elf
.sgot
== NULL
)
3068 off
= h
->got
.offset
;
3070 && h
->plt
.offset
!= (bfd_vma
)-1
3071 && off
== (bfd_vma
)-1)
3073 /* We can't use h->got.offset here to save
3074 state, or even just remember the offset, as
3075 finish_dynamic_symbol would use that as offset into
3077 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3078 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3079 base_got
= htab
->elf
.sgotplt
;
3082 dyn
= htab
->elf
.dynamic_sections_created
;
3084 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3086 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3087 || (ELF_ST_VISIBILITY (h
->other
)
3088 && h
->root
.type
== bfd_link_hash_undefweak
))
3090 /* This is actually a static link, or it is a -Bsymbolic
3091 link and the symbol is defined locally, or the symbol
3092 was forced to be local because of a version file. We
3093 must initialize this entry in the global offset table.
3094 Since the offset must always be a multiple of 8, we
3095 use the least significant bit to record whether we
3096 have initialized it already.
3098 When doing a dynamic link, we create a .rela.got
3099 relocation entry to initialize the value. This is
3100 done in the finish_dynamic_symbol routine. */
3105 bfd_put_64 (output_bfd
, relocation
,
3106 base_got
->contents
+ off
);
3107 /* Note that this is harmless for the GOTPLT64 case,
3108 as -1 | 1 still is -1. */
3113 unresolved_reloc
= FALSE
;
3117 if (local_got_offsets
== NULL
)
3120 off
= local_got_offsets
[r_symndx
];
3122 /* The offset must always be a multiple of 8. We use
3123 the least significant bit to record whether we have
3124 already generated the necessary reloc. */
3129 bfd_put_64 (output_bfd
, relocation
,
3130 base_got
->contents
+ off
);
3135 Elf_Internal_Rela outrel
;
3137 /* We need to generate a R_X86_64_RELATIVE reloc
3138 for the dynamic linker. */
3139 s
= htab
->elf
.srelgot
;
3143 outrel
.r_offset
= (base_got
->output_section
->vma
3144 + base_got
->output_offset
3146 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3147 outrel
.r_addend
= relocation
;
3148 elf_append_rela (output_bfd
, s
, &outrel
);
3151 local_got_offsets
[r_symndx
] |= 1;
3155 if (off
>= (bfd_vma
) -2)
3158 relocation
= base_got
->output_section
->vma
3159 + base_got
->output_offset
+ off
;
3160 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3161 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3162 - htab
->elf
.sgotplt
->output_offset
;
3166 case R_X86_64_GOTOFF64
:
3167 /* Relocation is relative to the start of the global offset
3170 /* Check to make sure it isn't a protected function symbol
3171 for shared library since it may not be local when used
3172 as function address. */
3176 && h
->type
== STT_FUNC
3177 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3179 (*_bfd_error_handler
)
3180 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3181 input_bfd
, h
->root
.root
.string
);
3182 bfd_set_error (bfd_error_bad_value
);
3186 /* Note that sgot is not involved in this
3187 calculation. We always want the start of .got.plt. If we
3188 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3189 permitted by the ABI, we might have to change this
3191 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3192 + htab
->elf
.sgotplt
->output_offset
;
3195 case R_X86_64_GOTPC32
:
3196 case R_X86_64_GOTPC64
:
3197 /* Use global offset table as symbol value. */
3198 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3199 + htab
->elf
.sgotplt
->output_offset
;
3200 unresolved_reloc
= FALSE
;
3203 case R_X86_64_PLTOFF64
:
3204 /* Relocation is PLT entry relative to GOT. For local
3205 symbols it's the symbol itself relative to GOT. */
3207 /* See PLT32 handling. */
3208 && h
->plt
.offset
!= (bfd_vma
) -1
3209 && htab
->elf
.splt
!= NULL
)
3211 relocation
= (htab
->elf
.splt
->output_section
->vma
3212 + htab
->elf
.splt
->output_offset
3214 unresolved_reloc
= FALSE
;
3217 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3218 + htab
->elf
.sgotplt
->output_offset
;
3221 case R_X86_64_PLT32
:
3222 /* Relocation is to the entry for this symbol in the
3223 procedure linkage table. */
3225 /* Resolve a PLT32 reloc against a local symbol directly,
3226 without using the procedure linkage table. */
3230 if (h
->plt
.offset
== (bfd_vma
) -1
3231 || htab
->elf
.splt
== NULL
)
3233 /* We didn't make a PLT entry for this symbol. This
3234 happens when statically linking PIC code, or when
3235 using -Bsymbolic. */
3239 relocation
= (htab
->elf
.splt
->output_section
->vma
3240 + htab
->elf
.splt
->output_offset
3242 unresolved_reloc
= FALSE
;
3249 && ABI_64_P (output_bfd
)
3250 && (input_section
->flags
& SEC_ALLOC
) != 0
3251 && (input_section
->flags
& SEC_READONLY
) != 0
3254 bfd_boolean fail
= FALSE
;
3256 = (r_type
== R_X86_64_PC32
3257 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3259 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3261 /* Symbol is referenced locally. Make sure it is
3262 defined locally or for a branch. */
3263 fail
= !h
->def_regular
&& !branch
;
3267 /* Symbol isn't referenced locally. We only allow
3268 branch to symbol with non-default visibility. */
3270 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3277 const char *pic
= "";
3279 switch (ELF_ST_VISIBILITY (h
->other
))
3282 v
= _("hidden symbol");
3285 v
= _("internal symbol");
3288 v
= _("protected symbol");
3292 pic
= _("; recompile with -fPIC");
3297 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3299 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3301 (*_bfd_error_handler
) (fmt
, input_bfd
,
3302 x86_64_elf_howto_table
[r_type
].name
,
3303 v
, h
->root
.root
.string
, pic
);
3304 bfd_set_error (bfd_error_bad_value
);
3315 /* FIXME: The ABI says the linker should make sure the value is
3316 the same when it's zeroextended to 64 bit. */
3318 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3323 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3324 || h
->root
.type
!= bfd_link_hash_undefweak
)
3325 && (! IS_X86_64_PCREL_TYPE (r_type
)
3326 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3327 || (ELIMINATE_COPY_RELOCS
3334 || h
->root
.type
== bfd_link_hash_undefweak
3335 || h
->root
.type
== bfd_link_hash_undefined
)))
3337 Elf_Internal_Rela outrel
;
3338 bfd_boolean skip
, relocate
;
3341 /* When generating a shared object, these relocations
3342 are copied into the output file to be resolved at run
3348 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3350 if (outrel
.r_offset
== (bfd_vma
) -1)
3352 else if (outrel
.r_offset
== (bfd_vma
) -2)
3353 skip
= TRUE
, relocate
= TRUE
;
3355 outrel
.r_offset
+= (input_section
->output_section
->vma
3356 + input_section
->output_offset
);
3359 memset (&outrel
, 0, sizeof outrel
);
3361 /* h->dynindx may be -1 if this symbol was marked to
3365 && (IS_X86_64_PCREL_TYPE (r_type
)
3367 || ! SYMBOLIC_BIND (info
, h
)
3368 || ! h
->def_regular
))
3370 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3371 outrel
.r_addend
= rel
->r_addend
;
3375 /* This symbol is local, or marked to become local. */
3376 if (r_type
== htab
->pointer_r_type
)
3379 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3380 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3386 if (bfd_is_abs_section (sec
))
3388 else if (sec
== NULL
|| sec
->owner
== NULL
)
3390 bfd_set_error (bfd_error_bad_value
);
3397 /* We are turning this relocation into one
3398 against a section symbol. It would be
3399 proper to subtract the symbol's value,
3400 osec->vma, from the emitted reloc addend,
3401 but ld.so expects buggy relocs. */
3402 osec
= sec
->output_section
;
3403 sindx
= elf_section_data (osec
)->dynindx
;
3406 asection
*oi
= htab
->elf
.text_index_section
;
3407 sindx
= elf_section_data (oi
)->dynindx
;
3409 BFD_ASSERT (sindx
!= 0);
3412 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3413 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3417 sreloc
= elf_section_data (input_section
)->sreloc
;
3419 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3421 r
= bfd_reloc_notsupported
;
3422 goto check_relocation_error
;
3425 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3427 /* If this reloc is against an external symbol, we do
3428 not want to fiddle with the addend. Otherwise, we
3429 need to include the symbol value so that it becomes
3430 an addend for the dynamic reloc. */
3437 case R_X86_64_TLSGD
:
3438 case R_X86_64_GOTPC32_TLSDESC
:
3439 case R_X86_64_TLSDESC_CALL
:
3440 case R_X86_64_GOTTPOFF
:
3441 tls_type
= GOT_UNKNOWN
;
3442 if (h
== NULL
&& local_got_offsets
)
3443 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3445 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3447 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3448 input_section
, contents
,
3449 symtab_hdr
, sym_hashes
,
3450 &r_type
, tls_type
, rel
,
3451 relend
, h
, r_symndx
))
3454 if (r_type
== R_X86_64_TPOFF32
)
3456 bfd_vma roff
= rel
->r_offset
;
3458 BFD_ASSERT (! unresolved_reloc
);
3460 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3462 /* GD->LE transition. For 64bit, change
3463 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3464 .word 0x6666; rex64; call __tls_get_addr
3467 leaq foo@tpoff(%rax), %rax
3469 leaq foo@tlsgd(%rip), %rdi
3470 .word 0x6666; rex64; call __tls_get_addr
3473 leaq foo@tpoff(%rax), %rax */
3474 if (ABI_64_P (output_bfd
))
3475 memcpy (contents
+ roff
- 4,
3476 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3479 memcpy (contents
+ roff
- 3,
3480 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3482 bfd_put_32 (output_bfd
,
3483 elf_x86_64_tpoff (info
, relocation
),
3484 contents
+ roff
+ 8);
3485 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3489 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3491 /* GDesc -> LE transition.
3492 It's originally something like:
3493 leaq x@tlsdesc(%rip), %rax
3496 movl $x@tpoff, %rax. */
3498 unsigned int val
, type
;
3500 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3501 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3502 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3503 contents
+ roff
- 3);
3504 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3505 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3506 contents
+ roff
- 1);
3507 bfd_put_32 (output_bfd
,
3508 elf_x86_64_tpoff (info
, relocation
),
3512 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3514 /* GDesc -> LE transition.
3519 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3520 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3523 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3525 /* IE->LE transition:
3526 Originally it can be one of:
3527 movq foo@gottpoff(%rip), %reg
3528 addq foo@gottpoff(%rip), %reg
3531 leaq foo(%reg), %reg
3534 unsigned int val
, type
, reg
;
3536 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3537 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3538 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3544 bfd_put_8 (output_bfd
, 0x49,
3545 contents
+ roff
- 3);
3546 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3547 bfd_put_8 (output_bfd
, 0x41,
3548 contents
+ roff
- 3);
3549 bfd_put_8 (output_bfd
, 0xc7,
3550 contents
+ roff
- 2);
3551 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3552 contents
+ roff
- 1);
3556 /* addq -> addq - addressing with %rsp/%r12 is
3559 bfd_put_8 (output_bfd
, 0x49,
3560 contents
+ roff
- 3);
3561 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3562 bfd_put_8 (output_bfd
, 0x41,
3563 contents
+ roff
- 3);
3564 bfd_put_8 (output_bfd
, 0x81,
3565 contents
+ roff
- 2);
3566 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3567 contents
+ roff
- 1);
3573 bfd_put_8 (output_bfd
, 0x4d,
3574 contents
+ roff
- 3);
3575 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3576 bfd_put_8 (output_bfd
, 0x45,
3577 contents
+ roff
- 3);
3578 bfd_put_8 (output_bfd
, 0x8d,
3579 contents
+ roff
- 2);
3580 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3581 contents
+ roff
- 1);
3583 bfd_put_32 (output_bfd
,
3584 elf_x86_64_tpoff (info
, relocation
),
3592 if (htab
->elf
.sgot
== NULL
)
3597 off
= h
->got
.offset
;
3598 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
3602 if (local_got_offsets
== NULL
)
3605 off
= local_got_offsets
[r_symndx
];
3606 offplt
= local_tlsdesc_gotents
[r_symndx
];
3613 Elf_Internal_Rela outrel
;
3617 if (htab
->elf
.srelgot
== NULL
)
3620 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3622 if (GOT_TLS_GDESC_P (tls_type
))
3624 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3625 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3626 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3627 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3628 + htab
->elf
.sgotplt
->output_offset
3630 + htab
->sgotplt_jump_table_size
);
3631 sreloc
= htab
->elf
.srelplt
;
3633 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3635 outrel
.r_addend
= 0;
3636 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3639 sreloc
= htab
->elf
.srelgot
;
3641 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3642 + htab
->elf
.sgot
->output_offset
+ off
);
3644 if (GOT_TLS_GD_P (tls_type
))
3645 dr_type
= R_X86_64_DTPMOD64
;
3646 else if (GOT_TLS_GDESC_P (tls_type
))
3649 dr_type
= R_X86_64_TPOFF64
;
3651 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3652 outrel
.r_addend
= 0;
3653 if ((dr_type
== R_X86_64_TPOFF64
3654 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3655 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3656 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
3658 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3660 if (GOT_TLS_GD_P (tls_type
))
3664 BFD_ASSERT (! unresolved_reloc
);
3665 bfd_put_64 (output_bfd
,
3666 relocation
- elf_x86_64_dtpoff_base (info
),
3667 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3671 bfd_put_64 (output_bfd
, 0,
3672 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3673 outrel
.r_info
= htab
->r_info (indx
,
3675 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3676 elf_append_rela (output_bfd
, sreloc
,
3685 local_got_offsets
[r_symndx
] |= 1;
3688 if (off
>= (bfd_vma
) -2
3689 && ! GOT_TLS_GDESC_P (tls_type
))
3691 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
3693 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3694 || r_type
== R_X86_64_TLSDESC_CALL
)
3695 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3696 + htab
->elf
.sgotplt
->output_offset
3697 + offplt
+ htab
->sgotplt_jump_table_size
;
3699 relocation
= htab
->elf
.sgot
->output_section
->vma
3700 + htab
->elf
.sgot
->output_offset
+ off
;
3701 unresolved_reloc
= FALSE
;
3705 bfd_vma roff
= rel
->r_offset
;
3707 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3709 /* GD->IE transition. For 64bit, change
3710 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3711 .word 0x6666; rex64; call __tls_get_addr@plt
3714 addq foo@gottpoff(%rip), %rax
3716 leaq foo@tlsgd(%rip), %rdi
3717 .word 0x6666; rex64; call __tls_get_addr@plt
3720 addq foo@gottpoff(%rip), %rax */
3721 if (ABI_64_P (output_bfd
))
3722 memcpy (contents
+ roff
- 4,
3723 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3726 memcpy (contents
+ roff
- 3,
3727 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3730 relocation
= (htab
->elf
.sgot
->output_section
->vma
3731 + htab
->elf
.sgot
->output_offset
+ off
3733 - input_section
->output_section
->vma
3734 - input_section
->output_offset
3736 bfd_put_32 (output_bfd
, relocation
,
3737 contents
+ roff
+ 8);
3738 /* Skip R_X86_64_PLT32. */
3742 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3744 /* GDesc -> IE transition.
3745 It's originally something like:
3746 leaq x@tlsdesc(%rip), %rax
3749 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3751 /* Now modify the instruction as appropriate. To
3752 turn a leaq into a movq in the form we use it, it
3753 suffices to change the second byte from 0x8d to
3755 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3757 bfd_put_32 (output_bfd
,
3758 htab
->elf
.sgot
->output_section
->vma
3759 + htab
->elf
.sgot
->output_offset
+ off
3761 - input_section
->output_section
->vma
3762 - input_section
->output_offset
3767 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3769 /* GDesc -> IE transition.
3776 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3777 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3785 case R_X86_64_TLSLD
:
3786 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3787 input_section
, contents
,
3788 symtab_hdr
, sym_hashes
,
3789 &r_type
, GOT_UNKNOWN
,
3790 rel
, relend
, h
, r_symndx
))
3793 if (r_type
!= R_X86_64_TLSLD
)
3795 /* LD->LE transition:
3796 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3797 For 64bit, we change it into:
3798 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
3799 For 32bit, we change it into:
3800 nopl 0x0(%rax); movl %fs:0, %eax. */
3802 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3803 if (ABI_64_P (output_bfd
))
3804 memcpy (contents
+ rel
->r_offset
- 3,
3805 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3807 memcpy (contents
+ rel
->r_offset
- 3,
3808 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
3809 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3814 if (htab
->elf
.sgot
== NULL
)
3817 off
= htab
->tls_ld_got
.offset
;
3822 Elf_Internal_Rela outrel
;
3824 if (htab
->elf
.srelgot
== NULL
)
3827 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3828 + htab
->elf
.sgot
->output_offset
+ off
);
3830 bfd_put_64 (output_bfd
, 0,
3831 htab
->elf
.sgot
->contents
+ off
);
3832 bfd_put_64 (output_bfd
, 0,
3833 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3834 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
3835 outrel
.r_addend
= 0;
3836 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
3838 htab
->tls_ld_got
.offset
|= 1;
3840 relocation
= htab
->elf
.sgot
->output_section
->vma
3841 + htab
->elf
.sgot
->output_offset
+ off
;
3842 unresolved_reloc
= FALSE
;
3845 case R_X86_64_DTPOFF32
:
3846 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
3847 relocation
-= elf_x86_64_dtpoff_base (info
);
3849 relocation
= elf_x86_64_tpoff (info
, relocation
);
3852 case R_X86_64_TPOFF32
:
3853 BFD_ASSERT (info
->executable
);
3854 relocation
= elf_x86_64_tpoff (info
, relocation
);
3861 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3862 because such sections are not SEC_ALLOC and thus ld.so will
3863 not process them. */
3864 if (unresolved_reloc
3865 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3867 (*_bfd_error_handler
)
3868 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3871 (long) rel
->r_offset
,
3873 h
->root
.root
.string
);
3876 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3877 contents
, rel
->r_offset
,
3878 relocation
, rel
->r_addend
);
3880 check_relocation_error
:
3881 if (r
!= bfd_reloc_ok
)
3886 name
= h
->root
.root
.string
;
3889 name
= bfd_elf_string_from_elf_section (input_bfd
,
3890 symtab_hdr
->sh_link
,
3895 name
= bfd_section_name (input_bfd
, sec
);
3898 if (r
== bfd_reloc_overflow
)
3900 if (! ((*info
->callbacks
->reloc_overflow
)
3901 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3902 (bfd_vma
) 0, input_bfd
, input_section
,
3908 (*_bfd_error_handler
)
3909 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3910 input_bfd
, input_section
,
3911 (long) rel
->r_offset
, name
, (int) r
);
3920 /* Finish up dynamic symbol handling. We set the contents of various
3921 dynamic sections here. */
3924 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3925 struct bfd_link_info
*info
,
3926 struct elf_link_hash_entry
*h
,
3927 Elf_Internal_Sym
*sym
)
3929 struct elf_x86_64_link_hash_table
*htab
;
3931 htab
= elf_x86_64_hash_table (info
);
3935 if (h
->plt
.offset
!= (bfd_vma
) -1)
3939 Elf_Internal_Rela rela
;
3941 asection
*plt
, *gotplt
, *relplt
;
3942 const struct elf_backend_data
*bed
;
3944 /* When building a static executable, use .iplt, .igot.plt and
3945 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3946 if (htab
->elf
.splt
!= NULL
)
3948 plt
= htab
->elf
.splt
;
3949 gotplt
= htab
->elf
.sgotplt
;
3950 relplt
= htab
->elf
.srelplt
;
3954 plt
= htab
->elf
.iplt
;
3955 gotplt
= htab
->elf
.igotplt
;
3956 relplt
= htab
->elf
.irelplt
;
3959 /* This symbol has an entry in the procedure linkage table. Set
3961 if ((h
->dynindx
== -1
3962 && !((h
->forced_local
|| info
->executable
)
3964 && h
->type
== STT_GNU_IFUNC
))
3970 /* Get the index in the procedure linkage table which
3971 corresponds to this symbol. This is the index of this symbol
3972 in all the symbols for which we are making plt entries. The
3973 first entry in the procedure linkage table is reserved.
3975 Get the offset into the .got table of the entry that
3976 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3977 bytes. The first three are reserved for the dynamic linker.
3979 For static executables, we don't reserve anything. */
3981 if (plt
== htab
->elf
.splt
)
3983 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3984 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3988 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3989 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
3992 /* Fill in the entry in the procedure linkage table. */
3993 memcpy (plt
->contents
+ h
->plt
.offset
, elf_x86_64_plt_entry
,
3996 /* Insert the relocation positions of the plt section. The magic
3997 numbers at the end of the statements are the positions of the
3998 relocations in the plt section. */
3999 /* Put offset for jmp *name@GOTPCREL(%rip), since the
4000 instruction uses 6 bytes, subtract this value. */
4001 bfd_put_32 (output_bfd
,
4002 (gotplt
->output_section
->vma
4003 + gotplt
->output_offset
4005 - plt
->output_section
->vma
4006 - plt
->output_offset
4009 plt
->contents
+ h
->plt
.offset
+ 2);
4011 /* Don't fill PLT entry for static executables. */
4012 if (plt
== htab
->elf
.splt
)
4014 /* Put relocation index. */
4015 bfd_put_32 (output_bfd
, plt_index
,
4016 plt
->contents
+ h
->plt
.offset
+ 7);
4017 /* Put offset for jmp .PLT0. */
4018 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
4019 plt
->contents
+ h
->plt
.offset
+ 12);
4022 /* Fill in the entry in the global offset table, initially this
4023 points to the pushq instruction in the PLT which is at offset 6. */
4024 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4025 + plt
->output_offset
4026 + h
->plt
.offset
+ 6),
4027 gotplt
->contents
+ got_offset
);
4029 /* Fill in the entry in the .rela.plt section. */
4030 rela
.r_offset
= (gotplt
->output_section
->vma
4031 + gotplt
->output_offset
4033 if (h
->dynindx
== -1
4034 || ((info
->executable
4035 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4037 && h
->type
== STT_GNU_IFUNC
))
4039 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4040 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4041 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4042 rela
.r_addend
= (h
->root
.u
.def
.value
4043 + h
->root
.u
.def
.section
->output_section
->vma
4044 + h
->root
.u
.def
.section
->output_offset
);
4048 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4052 bed
= get_elf_backend_data (output_bfd
);
4053 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4054 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4056 if (!h
->def_regular
)
4058 /* Mark the symbol as undefined, rather than as defined in
4059 the .plt section. Leave the value if there were any
4060 relocations where pointer equality matters (this is a clue
4061 for the dynamic linker, to make function pointer
4062 comparisons work between an application and shared
4063 library), otherwise set it to zero. If a function is only
4064 called from a binary, there is no need to slow down
4065 shared libraries because of that. */
4066 sym
->st_shndx
= SHN_UNDEF
;
4067 if (!h
->pointer_equality_needed
)
4072 if (h
->got
.offset
!= (bfd_vma
) -1
4073 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
4074 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4076 Elf_Internal_Rela rela
;
4078 /* This symbol has an entry in the global offset table. Set it
4080 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4083 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4084 + htab
->elf
.sgot
->output_offset
4085 + (h
->got
.offset
&~ (bfd_vma
) 1));
4087 /* If this is a static link, or it is a -Bsymbolic link and the
4088 symbol is defined locally or was forced to be local because
4089 of a version file, we just want to emit a RELATIVE reloc.
4090 The entry in the global offset table will already have been
4091 initialized in the relocate_section function. */
4093 && h
->type
== STT_GNU_IFUNC
)
4097 /* Generate R_X86_64_GLOB_DAT. */
4104 if (!h
->pointer_equality_needed
)
4107 /* For non-shared object, we can't use .got.plt, which
4108 contains the real function addres if we need pointer
4109 equality. We load the GOT entry with the PLT entry. */
4110 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4111 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4112 + plt
->output_offset
4114 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4118 else if (info
->shared
4119 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4121 if (!h
->def_regular
)
4123 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4124 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4125 rela
.r_addend
= (h
->root
.u
.def
.value
4126 + h
->root
.u
.def
.section
->output_section
->vma
4127 + h
->root
.u
.def
.section
->output_offset
);
4131 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4133 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4134 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4135 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4139 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
4144 Elf_Internal_Rela rela
;
4146 /* This symbol needs a copy reloc. Set it up. */
4148 if (h
->dynindx
== -1
4149 || (h
->root
.type
!= bfd_link_hash_defined
4150 && h
->root
.type
!= bfd_link_hash_defweak
)
4151 || htab
->srelbss
== NULL
)
4154 rela
.r_offset
= (h
->root
.u
.def
.value
4155 + h
->root
.u
.def
.section
->output_section
->vma
4156 + h
->root
.u
.def
.section
->output_offset
);
4157 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4159 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
4162 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4163 be NULL for local symbols. */
4165 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4166 || h
== htab
->elf
.hgot
))
4167 sym
->st_shndx
= SHN_ABS
;
4172 /* Finish up local dynamic symbol handling. We set the contents of
4173 various dynamic sections here. */
4176 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4178 struct elf_link_hash_entry
*h
4179 = (struct elf_link_hash_entry
*) *slot
;
4180 struct bfd_link_info
*info
4181 = (struct bfd_link_info
*) inf
;
4183 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4187 /* Used to decide how to sort relocs in an optimal manner for the
4188 dynamic linker, before writing them out. */
4190 static enum elf_reloc_type_class
4191 elf_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4193 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4195 case R_X86_64_RELATIVE
:
4196 return reloc_class_relative
;
4197 case R_X86_64_JUMP_SLOT
:
4198 return reloc_class_plt
;
4200 return reloc_class_copy
;
4202 return reloc_class_normal
;
4206 /* Finish up the dynamic sections. */
4209 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4210 struct bfd_link_info
*info
)
4212 struct elf_x86_64_link_hash_table
*htab
;
4216 htab
= elf_x86_64_hash_table (info
);
4220 dynobj
= htab
->elf
.dynobj
;
4221 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4223 if (htab
->elf
.dynamic_sections_created
)
4225 bfd_byte
*dyncon
, *dynconend
;
4226 const struct elf_backend_data
*bed
;
4227 bfd_size_type sizeof_dyn
;
4229 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4232 bed
= get_elf_backend_data (dynobj
);
4233 sizeof_dyn
= bed
->s
->sizeof_dyn
;
4234 dyncon
= sdyn
->contents
;
4235 dynconend
= sdyn
->contents
+ sdyn
->size
;
4236 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
4238 Elf_Internal_Dyn dyn
;
4241 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
4249 s
= htab
->elf
.sgotplt
;
4250 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4254 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4258 s
= htab
->elf
.srelplt
->output_section
;
4259 dyn
.d_un
.d_val
= s
->size
;
4263 /* The procedure linkage table relocs (DT_JMPREL) should
4264 not be included in the overall relocs (DT_RELA).
4265 Therefore, we override the DT_RELASZ entry here to
4266 make it not include the JMPREL relocs. Since the
4267 linker script arranges for .rela.plt to follow all
4268 other relocation sections, we don't have to worry
4269 about changing the DT_RELA entry. */
4270 if (htab
->elf
.srelplt
!= NULL
)
4272 s
= htab
->elf
.srelplt
->output_section
;
4273 dyn
.d_un
.d_val
-= s
->size
;
4277 case DT_TLSDESC_PLT
:
4279 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4280 + htab
->tlsdesc_plt
;
4283 case DT_TLSDESC_GOT
:
4285 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4286 + htab
->tlsdesc_got
;
4290 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
4293 /* Fill in the special first entry in the procedure linkage table. */
4294 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4296 /* Fill in the first entry in the procedure linkage table. */
4297 memcpy (htab
->elf
.splt
->contents
, elf_x86_64_plt0_entry
,
4299 /* Add offset for pushq GOT+8(%rip), since the instruction
4300 uses 6 bytes subtract this value. */
4301 bfd_put_32 (output_bfd
,
4302 (htab
->elf
.sgotplt
->output_section
->vma
4303 + htab
->elf
.sgotplt
->output_offset
4305 - htab
->elf
.splt
->output_section
->vma
4306 - htab
->elf
.splt
->output_offset
4308 htab
->elf
.splt
->contents
+ 2);
4309 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4310 the end of the instruction. */
4311 bfd_put_32 (output_bfd
,
4312 (htab
->elf
.sgotplt
->output_section
->vma
4313 + htab
->elf
.sgotplt
->output_offset
4315 - htab
->elf
.splt
->output_section
->vma
4316 - htab
->elf
.splt
->output_offset
4318 htab
->elf
.splt
->contents
+ 8);
4320 elf_section_data (htab
->elf
.splt
->output_section
)->this_hdr
.sh_entsize
=
4323 if (htab
->tlsdesc_plt
)
4325 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4326 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4328 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4329 elf_x86_64_plt0_entry
,
4332 /* Add offset for pushq GOT+8(%rip), since the
4333 instruction uses 6 bytes subtract this value. */
4334 bfd_put_32 (output_bfd
,
4335 (htab
->elf
.sgotplt
->output_section
->vma
4336 + htab
->elf
.sgotplt
->output_offset
4338 - htab
->elf
.splt
->output_section
->vma
4339 - htab
->elf
.splt
->output_offset
4342 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4343 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4344 htab->tlsdesc_got. The 12 is the offset to the end of
4346 bfd_put_32 (output_bfd
,
4347 (htab
->elf
.sgot
->output_section
->vma
4348 + htab
->elf
.sgot
->output_offset
4350 - htab
->elf
.splt
->output_section
->vma
4351 - htab
->elf
.splt
->output_offset
4354 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4359 if (htab
->elf
.sgotplt
)
4361 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4363 (*_bfd_error_handler
)
4364 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4368 /* Fill in the first three entries in the global offset table. */
4369 if (htab
->elf
.sgotplt
->size
> 0)
4371 /* Set the first entry in the global offset table to the address of
4372 the dynamic section. */
4374 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4376 bfd_put_64 (output_bfd
,
4377 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4378 htab
->elf
.sgotplt
->contents
);
4379 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4380 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4381 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4384 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4388 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4389 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4392 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4393 htab_traverse (htab
->loc_hash_table
,
4394 elf_x86_64_finish_local_dynamic_symbol
,
4400 /* Return address for Ith PLT stub in section PLT, for relocation REL
4401 or (bfd_vma) -1 if it should not be included. */
4404 elf_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4405 const arelent
*rel ATTRIBUTE_UNUSED
)
4407 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4410 /* Handle an x86-64 specific section when reading an object file. This
4411 is called when elfcode.h finds a section with an unknown type. */
4414 elf_x86_64_section_from_shdr (bfd
*abfd
,
4415 Elf_Internal_Shdr
*hdr
,
4419 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4422 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4428 /* Hook called by the linker routine which adds symbols from an object
4429 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4433 elf_x86_64_add_symbol_hook (bfd
*abfd
,
4434 struct bfd_link_info
*info
,
4435 Elf_Internal_Sym
*sym
,
4436 const char **namep ATTRIBUTE_UNUSED
,
4437 flagword
*flagsp ATTRIBUTE_UNUSED
,
4443 switch (sym
->st_shndx
)
4445 case SHN_X86_64_LCOMMON
:
4446 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4449 lcomm
= bfd_make_section_with_flags (abfd
,
4453 | SEC_LINKER_CREATED
));
4456 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4459 *valp
= sym
->st_size
;
4463 if ((abfd
->flags
& DYNAMIC
) == 0
4464 && (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
4465 || ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
))
4466 elf_tdata (info
->output_bfd
)->has_gnu_symbols
= TRUE
;
4472 /* Given a BFD section, try to locate the corresponding ELF section
4476 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4477 asection
*sec
, int *index_return
)
4479 if (sec
== &_bfd_elf_large_com_section
)
4481 *index_return
= SHN_X86_64_LCOMMON
;
4487 /* Process a symbol. */
4490 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4493 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4495 switch (elfsym
->internal_elf_sym
.st_shndx
)
4497 case SHN_X86_64_LCOMMON
:
4498 asym
->section
= &_bfd_elf_large_com_section
;
4499 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4500 /* Common symbol doesn't set BSF_GLOBAL. */
4501 asym
->flags
&= ~BSF_GLOBAL
;
4507 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4509 return (sym
->st_shndx
== SHN_COMMON
4510 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4514 elf_x86_64_common_section_index (asection
*sec
)
4516 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4519 return SHN_X86_64_LCOMMON
;
4523 elf_x86_64_common_section (asection
*sec
)
4525 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4526 return bfd_com_section_ptr
;
4528 return &_bfd_elf_large_com_section
;
4532 elf_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4533 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4534 struct elf_link_hash_entry
*h
,
4535 Elf_Internal_Sym
*sym
,
4537 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4538 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4539 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4540 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4541 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4542 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4543 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4544 bfd_boolean
*newdyn
,
4545 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4546 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4547 bfd
*abfd ATTRIBUTE_UNUSED
,
4549 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4550 bfd_boolean
*olddyn
,
4551 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4552 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4556 /* A normal common symbol and a large common symbol result in a
4557 normal common symbol. We turn the large common symbol into a
4560 && h
->root
.type
== bfd_link_hash_common
4562 && bfd_is_com_section (*sec
)
4565 if (sym
->st_shndx
== SHN_COMMON
4566 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4568 h
->root
.u
.c
.p
->section
4569 = bfd_make_section_old_way (oldbfd
, "COMMON");
4570 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4572 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4573 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4574 *psec
= *sec
= bfd_com_section_ptr
;
4581 elf_x86_64_additional_program_headers (bfd
*abfd
,
4582 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4587 /* Check to see if we need a large readonly segment. */
4588 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4589 if (s
&& (s
->flags
& SEC_LOAD
))
4592 /* Check to see if we need a large data segment. Since .lbss sections
4593 is placed right after the .bss section, there should be no need for
4594 a large data segment just because of .lbss. */
4595 s
= bfd_get_section_by_name (abfd
, ".ldata");
4596 if (s
&& (s
->flags
& SEC_LOAD
))
4602 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4605 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4607 if (h
->plt
.offset
!= (bfd_vma
) -1
4609 && !h
->pointer_equality_needed
)
4612 return _bfd_elf_hash_symbol (h
);
4615 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4618 elf_x86_64_relocs_compatible (const bfd_target
*input
,
4619 const bfd_target
*output
)
4621 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
4622 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
4623 && _bfd_elf_relocs_compatible (input
, output
));
4626 static const struct bfd_elf_special_section
4627 elf_x86_64_special_sections
[]=
4629 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4630 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4631 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4632 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4633 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4634 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4635 { NULL
, 0, 0, 0, 0 }
4638 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4639 #define TARGET_LITTLE_NAME "elf64-x86-64"
4640 #define ELF_ARCH bfd_arch_i386
4641 #define ELF_TARGET_ID X86_64_ELF_DATA
4642 #define ELF_MACHINE_CODE EM_X86_64
4643 #define ELF_MAXPAGESIZE 0x200000
4644 #define ELF_MINPAGESIZE 0x1000
4645 #define ELF_COMMONPAGESIZE 0x1000
4647 #define elf_backend_can_gc_sections 1
4648 #define elf_backend_can_refcount 1
4649 #define elf_backend_want_got_plt 1
4650 #define elf_backend_plt_readonly 1
4651 #define elf_backend_want_plt_sym 0
4652 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4653 #define elf_backend_rela_normal 1
4655 #define elf_info_to_howto elf_x86_64_info_to_howto
4657 #define bfd_elf64_bfd_link_hash_table_create \
4658 elf_x86_64_link_hash_table_create
4659 #define bfd_elf64_bfd_link_hash_table_free \
4660 elf_x86_64_link_hash_table_free
4661 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
4662 #define bfd_elf64_bfd_reloc_name_lookup \
4663 elf_x86_64_reloc_name_lookup
4665 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
4666 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
4667 #define elf_backend_check_relocs elf_x86_64_check_relocs
4668 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
4669 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
4670 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
4671 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
4672 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
4673 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
4674 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
4675 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
4676 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
4677 #define elf_backend_relocate_section elf_x86_64_relocate_section
4678 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
4679 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
4680 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4681 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
4682 #define elf_backend_object_p elf64_x86_64_elf_object_p
4683 #define bfd_elf64_mkobject elf_x86_64_mkobject
4685 #define elf_backend_section_from_shdr \
4686 elf_x86_64_section_from_shdr
4688 #define elf_backend_section_from_bfd_section \
4689 elf_x86_64_elf_section_from_bfd_section
4690 #define elf_backend_add_symbol_hook \
4691 elf_x86_64_add_symbol_hook
4692 #define elf_backend_symbol_processing \
4693 elf_x86_64_symbol_processing
4694 #define elf_backend_common_section_index \
4695 elf_x86_64_common_section_index
4696 #define elf_backend_common_section \
4697 elf_x86_64_common_section
4698 #define elf_backend_common_definition \
4699 elf_x86_64_common_definition
4700 #define elf_backend_merge_symbol \
4701 elf_x86_64_merge_symbol
4702 #define elf_backend_special_sections \
4703 elf_x86_64_special_sections
4704 #define elf_backend_additional_program_headers \
4705 elf_x86_64_additional_program_headers
4706 #define elf_backend_hash_symbol \
4707 elf_x86_64_hash_symbol
4709 #undef elf_backend_post_process_headers
4710 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4712 #include "elf64-target.h"
4714 /* FreeBSD support. */
4716 #undef TARGET_LITTLE_SYM
4717 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4718 #undef TARGET_LITTLE_NAME
4719 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4722 #define ELF_OSABI ELFOSABI_FREEBSD
4725 #define elf64_bed elf64_x86_64_fbsd_bed
4727 #include "elf64-target.h"
4729 /* Solaris 2 support. */
4731 #undef TARGET_LITTLE_SYM
4732 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4733 #undef TARGET_LITTLE_NAME
4734 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4736 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4737 objects won't be recognized. */
4741 #define elf64_bed elf64_x86_64_sol2_bed
4743 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
4745 #undef elf_backend_static_tls_alignment
4746 #define elf_backend_static_tls_alignment 16
4748 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4750 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4752 #undef elf_backend_want_plt_sym
4753 #define elf_backend_want_plt_sym 1
4755 #include "elf64-target.h"
4757 /* Intel L1OM support. */
4760 elf64_l1om_elf_object_p (bfd
*abfd
)
4762 /* Set the right machine number for an L1OM elf64 file. */
4763 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
4767 #undef TARGET_LITTLE_SYM
4768 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4769 #undef TARGET_LITTLE_NAME
4770 #define TARGET_LITTLE_NAME "elf64-l1om"
4772 #define ELF_ARCH bfd_arch_l1om
4774 #undef ELF_MACHINE_CODE
4775 #define ELF_MACHINE_CODE EM_L1OM
4780 #define elf64_bed elf64_l1om_bed
4782 #undef elf_backend_object_p
4783 #define elf_backend_object_p elf64_l1om_elf_object_p
4785 #undef elf_backend_post_process_headers
4786 #undef elf_backend_static_tls_alignment
4788 #undef elf_backend_want_plt_sym
4789 #define elf_backend_want_plt_sym 0
4791 #include "elf64-target.h"
4793 /* FreeBSD L1OM support. */
4795 #undef TARGET_LITTLE_SYM
4796 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4797 #undef TARGET_LITTLE_NAME
4798 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4801 #define ELF_OSABI ELFOSABI_FREEBSD
4804 #define elf64_bed elf64_l1om_fbsd_bed
4806 #undef elf_backend_post_process_headers
4807 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4809 #include "elf64-target.h"
4811 /* 32bit x86-64 support. */
4814 elf32_x86_64_elf_object_p (bfd
*abfd
)
4816 /* Set the right machine number for an x86-64 elf32 file. */
4817 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
4821 #undef TARGET_LITTLE_SYM
4822 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
4823 #undef TARGET_LITTLE_NAME
4824 #define TARGET_LITTLE_NAME "elf32-x86-64"
4827 #define ELF_ARCH bfd_arch_i386
4829 #undef ELF_MACHINE_CODE
4830 #define ELF_MACHINE_CODE EM_X86_64
4832 #define bfd_elf32_bfd_link_hash_table_create \
4833 elf_x86_64_link_hash_table_create
4834 #define bfd_elf32_bfd_link_hash_table_free \
4835 elf_x86_64_link_hash_table_free
4836 #define bfd_elf32_bfd_reloc_type_lookup \
4837 elf_x86_64_reloc_type_lookup
4838 #define bfd_elf32_bfd_reloc_name_lookup \
4839 elf_x86_64_reloc_name_lookup
4840 #define bfd_elf32_mkobject \
4845 #undef elf_backend_post_process_headers
4847 #undef elf_backend_object_p
4848 #define elf_backend_object_p \
4849 elf32_x86_64_elf_object_p
4851 #undef elf_backend_bfd_from_remote_memory
4852 #define elf_backend_bfd_from_remote_memory \
4853 _bfd_elf32_bfd_from_remote_memory
4855 #undef elf_backend_size_info
4856 #define elf_backend_size_info \
4857 _bfd_elf32_size_info
4859 #include "elf32-target.h"