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 if (info
->warn_shared_textrel
&& info
->shared
)
2318 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2319 p
->sec
->owner
, h
->root
.root
.string
,
2322 /* Not an error, just cut short the traversal. */
2329 /* Set the sizes of the dynamic sections. */
2332 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
2333 struct bfd_link_info
*info
)
2335 struct elf_x86_64_link_hash_table
*htab
;
2340 const struct elf_backend_data
*bed
;
2342 htab
= elf_x86_64_hash_table (info
);
2345 bed
= get_elf_backend_data (output_bfd
);
2347 dynobj
= htab
->elf
.dynobj
;
2351 if (htab
->elf
.dynamic_sections_created
)
2353 /* Set the contents of the .interp section to the interpreter. */
2354 if (info
->executable
)
2356 s
= bfd_get_section_by_name (dynobj
, ".interp");
2359 s
->size
= htab
->dynamic_interpreter_size
;
2360 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2364 /* Set up .got offsets for local syms, and space for local dynamic
2366 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2368 bfd_signed_vma
*local_got
;
2369 bfd_signed_vma
*end_local_got
;
2370 char *local_tls_type
;
2371 bfd_vma
*local_tlsdesc_gotent
;
2372 bfd_size_type locsymcount
;
2373 Elf_Internal_Shdr
*symtab_hdr
;
2376 if (! is_x86_64_elf (ibfd
))
2379 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2381 struct elf_dyn_relocs
*p
;
2383 for (p
= (struct elf_dyn_relocs
*)
2384 (elf_section_data (s
)->local_dynrel
);
2388 if (!bfd_is_abs_section (p
->sec
)
2389 && bfd_is_abs_section (p
->sec
->output_section
))
2391 /* Input section has been discarded, either because
2392 it is a copy of a linkonce section or due to
2393 linker script /DISCARD/, so we'll be discarding
2396 else if (p
->count
!= 0)
2398 srel
= elf_section_data (p
->sec
)->sreloc
;
2399 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2400 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2402 info
->flags
|= DF_TEXTREL
;
2403 if (info
->warn_shared_textrel
&& info
->shared
)
2404 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2405 p
->sec
->owner
, p
->sec
);
2412 local_got
= elf_local_got_refcounts (ibfd
);
2416 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2417 locsymcount
= symtab_hdr
->sh_info
;
2418 end_local_got
= local_got
+ locsymcount
;
2419 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
2420 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
2422 srel
= htab
->elf
.srelgot
;
2423 for (; local_got
< end_local_got
;
2424 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2426 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2429 if (GOT_TLS_GDESC_P (*local_tls_type
))
2431 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2432 - elf_x86_64_compute_jump_table_size (htab
);
2433 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2434 *local_got
= (bfd_vma
) -2;
2436 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2437 || GOT_TLS_GD_P (*local_tls_type
))
2439 *local_got
= s
->size
;
2440 s
->size
+= GOT_ENTRY_SIZE
;
2441 if (GOT_TLS_GD_P (*local_tls_type
))
2442 s
->size
+= GOT_ENTRY_SIZE
;
2445 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2446 || *local_tls_type
== GOT_TLS_IE
)
2448 if (GOT_TLS_GDESC_P (*local_tls_type
))
2450 htab
->elf
.srelplt
->size
2451 += bed
->s
->sizeof_rela
;
2452 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2454 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2455 || GOT_TLS_GD_P (*local_tls_type
))
2456 srel
->size
+= bed
->s
->sizeof_rela
;
2460 *local_got
= (bfd_vma
) -1;
2464 if (htab
->tls_ld_got
.refcount
> 0)
2466 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2468 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2469 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2470 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2473 htab
->tls_ld_got
.offset
= -1;
2475 /* Allocate global sym .plt and .got entries, and space for global
2476 sym dynamic relocs. */
2477 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
2480 /* Allocate .plt and .got entries, and space for local symbols. */
2481 htab_traverse (htab
->loc_hash_table
,
2482 elf_x86_64_allocate_local_dynrelocs
,
2485 /* For every jump slot reserved in the sgotplt, reloc_count is
2486 incremented. However, when we reserve space for TLS descriptors,
2487 it's not incremented, so in order to compute the space reserved
2488 for them, it suffices to multiply the reloc count by the jump
2490 if (htab
->elf
.srelplt
)
2491 htab
->sgotplt_jump_table_size
2492 = elf_x86_64_compute_jump_table_size (htab
);
2494 if (htab
->tlsdesc_plt
)
2496 /* If we're not using lazy TLS relocations, don't generate the
2497 PLT and GOT entries they require. */
2498 if ((info
->flags
& DF_BIND_NOW
))
2499 htab
->tlsdesc_plt
= 0;
2502 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2503 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2504 /* Reserve room for the initial entry.
2505 FIXME: we could probably do away with it in this case. */
2506 if (htab
->elf
.splt
->size
== 0)
2507 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2508 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2509 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2513 if (htab
->elf
.sgotplt
)
2515 struct elf_link_hash_entry
*got
;
2516 got
= elf_link_hash_lookup (elf_hash_table (info
),
2517 "_GLOBAL_OFFSET_TABLE_",
2518 FALSE
, FALSE
, FALSE
);
2520 /* Don't allocate .got.plt section if there are no GOT nor PLT
2521 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2523 || !got
->ref_regular_nonweak
)
2524 && (htab
->elf
.sgotplt
->size
2525 == get_elf_backend_data (output_bfd
)->got_header_size
)
2526 && (htab
->elf
.splt
== NULL
2527 || htab
->elf
.splt
->size
== 0)
2528 && (htab
->elf
.sgot
== NULL
2529 || htab
->elf
.sgot
->size
== 0)
2530 && (htab
->elf
.iplt
== NULL
2531 || htab
->elf
.iplt
->size
== 0)
2532 && (htab
->elf
.igotplt
== NULL
2533 || htab
->elf
.igotplt
->size
== 0))
2534 htab
->elf
.sgotplt
->size
= 0;
2537 /* We now have determined the sizes of the various dynamic sections.
2538 Allocate memory for them. */
2540 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2542 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2545 if (s
== htab
->elf
.splt
2546 || s
== htab
->elf
.sgot
2547 || s
== htab
->elf
.sgotplt
2548 || s
== htab
->elf
.iplt
2549 || s
== htab
->elf
.igotplt
2550 || s
== htab
->sdynbss
)
2552 /* Strip this section if we don't need it; see the
2555 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2557 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2560 /* We use the reloc_count field as a counter if we need
2561 to copy relocs into the output file. */
2562 if (s
!= htab
->elf
.srelplt
)
2567 /* It's not one of our sections, so don't allocate space. */
2573 /* If we don't need this section, strip it from the
2574 output file. This is mostly to handle .rela.bss and
2575 .rela.plt. We must create both sections in
2576 create_dynamic_sections, because they must be created
2577 before the linker maps input sections to output
2578 sections. The linker does that before
2579 adjust_dynamic_symbol is called, and it is that
2580 function which decides whether anything needs to go
2581 into these sections. */
2583 s
->flags
|= SEC_EXCLUDE
;
2587 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2590 /* Allocate memory for the section contents. We use bfd_zalloc
2591 here in case unused entries are not reclaimed before the
2592 section's contents are written out. This should not happen,
2593 but this way if it does, we get a R_X86_64_NONE reloc instead
2595 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2596 if (s
->contents
== NULL
)
2600 if (htab
->elf
.dynamic_sections_created
)
2602 /* Add some entries to the .dynamic section. We fill in the
2603 values later, in elf_x86_64_finish_dynamic_sections, but we
2604 must add the entries now so that we get the correct size for
2605 the .dynamic section. The DT_DEBUG entry is filled in by the
2606 dynamic linker and used by the debugger. */
2607 #define add_dynamic_entry(TAG, VAL) \
2608 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2610 if (info
->executable
)
2612 if (!add_dynamic_entry (DT_DEBUG
, 0))
2616 if (htab
->elf
.splt
->size
!= 0)
2618 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2619 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2620 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2621 || !add_dynamic_entry (DT_JMPREL
, 0))
2624 if (htab
->tlsdesc_plt
2625 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2626 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2632 if (!add_dynamic_entry (DT_RELA
, 0)
2633 || !add_dynamic_entry (DT_RELASZ
, 0)
2634 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
2637 /* If any dynamic relocs apply to a read-only section,
2638 then we need a DT_TEXTREL entry. */
2639 if ((info
->flags
& DF_TEXTREL
) == 0)
2640 elf_link_hash_traverse (&htab
->elf
,
2641 elf_x86_64_readonly_dynrelocs
,
2644 if ((info
->flags
& DF_TEXTREL
) != 0)
2646 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2651 #undef add_dynamic_entry
2657 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2658 struct bfd_link_info
*info
)
2660 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2664 struct elf_link_hash_entry
*tlsbase
;
2666 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2667 "_TLS_MODULE_BASE_",
2668 FALSE
, FALSE
, FALSE
);
2670 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2672 struct elf_x86_64_link_hash_table
*htab
;
2673 struct bfd_link_hash_entry
*bh
= NULL
;
2674 const struct elf_backend_data
*bed
2675 = get_elf_backend_data (output_bfd
);
2677 htab
= elf_x86_64_hash_table (info
);
2681 if (!(_bfd_generic_link_add_one_symbol
2682 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2683 tls_sec
, 0, NULL
, FALSE
,
2684 bed
->collect
, &bh
)))
2687 htab
->tls_module_base
= bh
;
2689 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2690 tlsbase
->def_regular
= 1;
2691 tlsbase
->other
= STV_HIDDEN
;
2692 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2699 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2700 executables. Rather than setting it to the beginning of the TLS
2701 section, we have to set it to the end. This function may be called
2702 multiple times, it is idempotent. */
2705 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2707 struct elf_x86_64_link_hash_table
*htab
;
2708 struct bfd_link_hash_entry
*base
;
2710 if (!info
->executable
)
2713 htab
= elf_x86_64_hash_table (info
);
2717 base
= htab
->tls_module_base
;
2721 base
->u
.def
.value
= htab
->elf
.tls_size
;
2724 /* Return the base VMA address which should be subtracted from real addresses
2725 when resolving @dtpoff relocation.
2726 This is PT_TLS segment p_vaddr. */
2729 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2731 /* If tls_sec is NULL, we should have signalled an error already. */
2732 if (elf_hash_table (info
)->tls_sec
== NULL
)
2734 return elf_hash_table (info
)->tls_sec
->vma
;
2737 /* Return the relocation value for @tpoff relocation
2738 if STT_TLS virtual address is ADDRESS. */
2741 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2743 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2744 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2745 bfd_vma static_tls_size
;
2747 /* If tls_segment is NULL, we should have signalled an error already. */
2748 if (htab
->tls_sec
== NULL
)
2751 /* Consider special static TLS alignment requirements. */
2752 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2753 return address
- static_tls_size
- htab
->tls_sec
->vma
;
2756 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2760 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2762 /* Opcode Instruction
2765 0x0f 0x8x conditional jump */
2767 && (contents
[offset
- 1] == 0xe8
2768 || contents
[offset
- 1] == 0xe9))
2770 && contents
[offset
- 2] == 0x0f
2771 && (contents
[offset
- 1] & 0xf0) == 0x80));
2774 /* Relocate an x86_64 ELF section. */
2777 elf_x86_64_relocate_section (bfd
*output_bfd
,
2778 struct bfd_link_info
*info
,
2780 asection
*input_section
,
2782 Elf_Internal_Rela
*relocs
,
2783 Elf_Internal_Sym
*local_syms
,
2784 asection
**local_sections
)
2786 struct elf_x86_64_link_hash_table
*htab
;
2787 Elf_Internal_Shdr
*symtab_hdr
;
2788 struct elf_link_hash_entry
**sym_hashes
;
2789 bfd_vma
*local_got_offsets
;
2790 bfd_vma
*local_tlsdesc_gotents
;
2791 Elf_Internal_Rela
*rel
;
2792 Elf_Internal_Rela
*relend
;
2794 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2796 htab
= elf_x86_64_hash_table (info
);
2799 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2800 sym_hashes
= elf_sym_hashes (input_bfd
);
2801 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2802 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
2804 elf_x86_64_set_tls_module_base (info
);
2807 relend
= relocs
+ input_section
->reloc_count
;
2808 for (; rel
< relend
; rel
++)
2810 unsigned int r_type
;
2811 reloc_howto_type
*howto
;
2812 unsigned long r_symndx
;
2813 struct elf_link_hash_entry
*h
;
2814 Elf_Internal_Sym
*sym
;
2816 bfd_vma off
, offplt
;
2818 bfd_boolean unresolved_reloc
;
2819 bfd_reloc_status_type r
;
2823 r_type
= ELF32_R_TYPE (rel
->r_info
);
2824 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2825 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2828 if (r_type
>= R_X86_64_max
)
2830 bfd_set_error (bfd_error_bad_value
);
2834 howto
= x86_64_elf_howto_table
+ r_type
;
2835 r_symndx
= htab
->r_sym (rel
->r_info
);
2839 unresolved_reloc
= FALSE
;
2840 if (r_symndx
< symtab_hdr
->sh_info
)
2842 sym
= local_syms
+ r_symndx
;
2843 sec
= local_sections
[r_symndx
];
2845 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2848 /* Relocate against local STT_GNU_IFUNC symbol. */
2849 if (!info
->relocatable
2850 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2852 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
2857 /* Set STT_GNU_IFUNC symbol value. */
2858 h
->root
.u
.def
.value
= sym
->st_value
;
2859 h
->root
.u
.def
.section
= sec
;
2864 bfd_boolean warned ATTRIBUTE_UNUSED
;
2866 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2867 r_symndx
, symtab_hdr
, sym_hashes
,
2869 unresolved_reloc
, warned
);
2872 if (sec
!= NULL
&& elf_discarded_section (sec
))
2873 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2874 rel
, relend
, howto
, contents
);
2876 if (info
->relocatable
)
2879 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2880 it here if it is defined in a non-shared object. */
2882 && h
->type
== STT_GNU_IFUNC
2889 if ((input_section
->flags
& SEC_ALLOC
) == 0
2890 || h
->plt
.offset
== (bfd_vma
) -1)
2893 /* STT_GNU_IFUNC symbol must go through PLT. */
2894 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
2895 relocation
= (plt
->output_section
->vma
2896 + plt
->output_offset
+ h
->plt
.offset
);
2901 if (h
->root
.root
.string
)
2902 name
= h
->root
.root
.string
;
2904 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2906 (*_bfd_error_handler
)
2907 (_("%B: relocation %s against STT_GNU_IFUNC "
2908 "symbol `%s' isn't handled by %s"), input_bfd
,
2909 x86_64_elf_howto_table
[r_type
].name
,
2910 name
, __FUNCTION__
);
2911 bfd_set_error (bfd_error_bad_value
);
2920 if (ABI_64_P (output_bfd
))
2924 if (rel
->r_addend
!= 0)
2926 if (h
->root
.root
.string
)
2927 name
= h
->root
.root
.string
;
2929 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2931 (*_bfd_error_handler
)
2932 (_("%B: relocation %s against STT_GNU_IFUNC "
2933 "symbol `%s' has non-zero addend: %d"),
2934 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2935 name
, rel
->r_addend
);
2936 bfd_set_error (bfd_error_bad_value
);
2940 /* Generate dynamic relcoation only when there is a
2941 non-GOF reference in a shared object. */
2942 if (info
->shared
&& h
->non_got_ref
)
2944 Elf_Internal_Rela outrel
;
2947 /* Need a dynamic relocation to get the real function
2949 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2953 if (outrel
.r_offset
== (bfd_vma
) -1
2954 || outrel
.r_offset
== (bfd_vma
) -2)
2957 outrel
.r_offset
+= (input_section
->output_section
->vma
2958 + input_section
->output_offset
);
2960 if (h
->dynindx
== -1
2962 || info
->executable
)
2964 /* This symbol is resolved locally. */
2965 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
2966 outrel
.r_addend
= (h
->root
.u
.def
.value
2967 + h
->root
.u
.def
.section
->output_section
->vma
2968 + h
->root
.u
.def
.section
->output_offset
);
2972 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
2973 outrel
.r_addend
= 0;
2976 sreloc
= htab
->elf
.irelifunc
;
2977 elf_append_rela (output_bfd
, sreloc
, &outrel
);
2979 /* If this reloc is against an external symbol, we
2980 do not want to fiddle with the addend. Otherwise,
2981 we need to include the symbol value so that it
2982 becomes an addend for the dynamic reloc. For an
2983 internal symbol, we have updated addend. */
2989 case R_X86_64_PLT32
:
2992 case R_X86_64_GOTPCREL
:
2993 case R_X86_64_GOTPCREL64
:
2994 base_got
= htab
->elf
.sgot
;
2995 off
= h
->got
.offset
;
2997 if (base_got
== NULL
)
3000 if (off
== (bfd_vma
) -1)
3002 /* We can't use h->got.offset here to save state, or
3003 even just remember the offset, as finish_dynamic_symbol
3004 would use that as offset into .got. */
3006 if (htab
->elf
.splt
!= NULL
)
3008 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3009 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3010 base_got
= htab
->elf
.sgotplt
;
3014 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3015 off
= plt_index
* GOT_ENTRY_SIZE
;
3016 base_got
= htab
->elf
.igotplt
;
3019 if (h
->dynindx
== -1
3023 /* This references the local defitionion. We must
3024 initialize this entry in the global offset table.
3025 Since the offset must always be a multiple of 8,
3026 we use the least significant bit to record
3027 whether we have initialized it already.
3029 When doing a dynamic link, we create a .rela.got
3030 relocation entry to initialize the value. This
3031 is done in the finish_dynamic_symbol routine. */
3036 bfd_put_64 (output_bfd
, relocation
,
3037 base_got
->contents
+ off
);
3038 /* Note that this is harmless for the GOTPLT64
3039 case, as -1 | 1 still is -1. */
3045 relocation
= (base_got
->output_section
->vma
3046 + base_got
->output_offset
+ off
);
3052 /* When generating a shared object, the relocations handled here are
3053 copied into the output file to be resolved at run time. */
3056 case R_X86_64_GOT32
:
3057 case R_X86_64_GOT64
:
3058 /* Relocation is to the entry for this symbol in the global
3060 case R_X86_64_GOTPCREL
:
3061 case R_X86_64_GOTPCREL64
:
3062 /* Use global offset table entry as symbol value. */
3063 case R_X86_64_GOTPLT64
:
3064 /* This is the same as GOT64 for relocation purposes, but
3065 indicates the existence of a PLT entry. The difficulty is,
3066 that we must calculate the GOT slot offset from the PLT
3067 offset, if this symbol got a PLT entry (it was global).
3068 Additionally if it's computed from the PLT entry, then that
3069 GOT offset is relative to .got.plt, not to .got. */
3070 base_got
= htab
->elf
.sgot
;
3072 if (htab
->elf
.sgot
== NULL
)
3079 off
= h
->got
.offset
;
3081 && h
->plt
.offset
!= (bfd_vma
)-1
3082 && off
== (bfd_vma
)-1)
3084 /* We can't use h->got.offset here to save
3085 state, or even just remember the offset, as
3086 finish_dynamic_symbol would use that as offset into
3088 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3089 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3090 base_got
= htab
->elf
.sgotplt
;
3093 dyn
= htab
->elf
.dynamic_sections_created
;
3095 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3097 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3098 || (ELF_ST_VISIBILITY (h
->other
)
3099 && h
->root
.type
== bfd_link_hash_undefweak
))
3101 /* This is actually a static link, or it is a -Bsymbolic
3102 link and the symbol is defined locally, or the symbol
3103 was forced to be local because of a version file. We
3104 must initialize this entry in the global offset table.
3105 Since the offset must always be a multiple of 8, we
3106 use the least significant bit to record whether we
3107 have initialized it already.
3109 When doing a dynamic link, we create a .rela.got
3110 relocation entry to initialize the value. This is
3111 done in the finish_dynamic_symbol routine. */
3116 bfd_put_64 (output_bfd
, relocation
,
3117 base_got
->contents
+ off
);
3118 /* Note that this is harmless for the GOTPLT64 case,
3119 as -1 | 1 still is -1. */
3124 unresolved_reloc
= FALSE
;
3128 if (local_got_offsets
== NULL
)
3131 off
= local_got_offsets
[r_symndx
];
3133 /* The offset must always be a multiple of 8. We use
3134 the least significant bit to record whether we have
3135 already generated the necessary reloc. */
3140 bfd_put_64 (output_bfd
, relocation
,
3141 base_got
->contents
+ off
);
3146 Elf_Internal_Rela outrel
;
3148 /* We need to generate a R_X86_64_RELATIVE reloc
3149 for the dynamic linker. */
3150 s
= htab
->elf
.srelgot
;
3154 outrel
.r_offset
= (base_got
->output_section
->vma
3155 + base_got
->output_offset
3157 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3158 outrel
.r_addend
= relocation
;
3159 elf_append_rela (output_bfd
, s
, &outrel
);
3162 local_got_offsets
[r_symndx
] |= 1;
3166 if (off
>= (bfd_vma
) -2)
3169 relocation
= base_got
->output_section
->vma
3170 + base_got
->output_offset
+ off
;
3171 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3172 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3173 - htab
->elf
.sgotplt
->output_offset
;
3177 case R_X86_64_GOTOFF64
:
3178 /* Relocation is relative to the start of the global offset
3181 /* Check to make sure it isn't a protected function symbol
3182 for shared library since it may not be local when used
3183 as function address. */
3187 && h
->type
== STT_FUNC
3188 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3190 (*_bfd_error_handler
)
3191 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3192 input_bfd
, h
->root
.root
.string
);
3193 bfd_set_error (bfd_error_bad_value
);
3197 /* Note that sgot is not involved in this
3198 calculation. We always want the start of .got.plt. If we
3199 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3200 permitted by the ABI, we might have to change this
3202 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3203 + htab
->elf
.sgotplt
->output_offset
;
3206 case R_X86_64_GOTPC32
:
3207 case R_X86_64_GOTPC64
:
3208 /* Use global offset table as symbol value. */
3209 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3210 + htab
->elf
.sgotplt
->output_offset
;
3211 unresolved_reloc
= FALSE
;
3214 case R_X86_64_PLTOFF64
:
3215 /* Relocation is PLT entry relative to GOT. For local
3216 symbols it's the symbol itself relative to GOT. */
3218 /* See PLT32 handling. */
3219 && h
->plt
.offset
!= (bfd_vma
) -1
3220 && htab
->elf
.splt
!= NULL
)
3222 relocation
= (htab
->elf
.splt
->output_section
->vma
3223 + htab
->elf
.splt
->output_offset
3225 unresolved_reloc
= FALSE
;
3228 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3229 + htab
->elf
.sgotplt
->output_offset
;
3232 case R_X86_64_PLT32
:
3233 /* Relocation is to the entry for this symbol in the
3234 procedure linkage table. */
3236 /* Resolve a PLT32 reloc against a local symbol directly,
3237 without using the procedure linkage table. */
3241 if (h
->plt
.offset
== (bfd_vma
) -1
3242 || htab
->elf
.splt
== NULL
)
3244 /* We didn't make a PLT entry for this symbol. This
3245 happens when statically linking PIC code, or when
3246 using -Bsymbolic. */
3250 relocation
= (htab
->elf
.splt
->output_section
->vma
3251 + htab
->elf
.splt
->output_offset
3253 unresolved_reloc
= FALSE
;
3260 && ABI_64_P (output_bfd
)
3261 && (input_section
->flags
& SEC_ALLOC
) != 0
3262 && (input_section
->flags
& SEC_READONLY
) != 0
3265 bfd_boolean fail
= FALSE
;
3267 = (r_type
== R_X86_64_PC32
3268 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3270 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3272 /* Symbol is referenced locally. Make sure it is
3273 defined locally or for a branch. */
3274 fail
= !h
->def_regular
&& !branch
;
3278 /* Symbol isn't referenced locally. We only allow
3279 branch to symbol with non-default visibility. */
3281 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3288 const char *pic
= "";
3290 switch (ELF_ST_VISIBILITY (h
->other
))
3293 v
= _("hidden symbol");
3296 v
= _("internal symbol");
3299 v
= _("protected symbol");
3303 pic
= _("; recompile with -fPIC");
3308 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3310 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3312 (*_bfd_error_handler
) (fmt
, input_bfd
,
3313 x86_64_elf_howto_table
[r_type
].name
,
3314 v
, h
->root
.root
.string
, pic
);
3315 bfd_set_error (bfd_error_bad_value
);
3326 /* FIXME: The ABI says the linker should make sure the value is
3327 the same when it's zeroextended to 64 bit. */
3329 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3334 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3335 || h
->root
.type
!= bfd_link_hash_undefweak
)
3336 && (! IS_X86_64_PCREL_TYPE (r_type
)
3337 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3338 || (ELIMINATE_COPY_RELOCS
3345 || h
->root
.type
== bfd_link_hash_undefweak
3346 || h
->root
.type
== bfd_link_hash_undefined
)))
3348 Elf_Internal_Rela outrel
;
3349 bfd_boolean skip
, relocate
;
3352 /* When generating a shared object, these relocations
3353 are copied into the output file to be resolved at run
3359 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3361 if (outrel
.r_offset
== (bfd_vma
) -1)
3363 else if (outrel
.r_offset
== (bfd_vma
) -2)
3364 skip
= TRUE
, relocate
= TRUE
;
3366 outrel
.r_offset
+= (input_section
->output_section
->vma
3367 + input_section
->output_offset
);
3370 memset (&outrel
, 0, sizeof outrel
);
3372 /* h->dynindx may be -1 if this symbol was marked to
3376 && (IS_X86_64_PCREL_TYPE (r_type
)
3378 || ! SYMBOLIC_BIND (info
, h
)
3379 || ! h
->def_regular
))
3381 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3382 outrel
.r_addend
= rel
->r_addend
;
3386 /* This symbol is local, or marked to become local. */
3387 if (r_type
== htab
->pointer_r_type
)
3390 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3391 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3397 if (bfd_is_abs_section (sec
))
3399 else if (sec
== NULL
|| sec
->owner
== NULL
)
3401 bfd_set_error (bfd_error_bad_value
);
3408 /* We are turning this relocation into one
3409 against a section symbol. It would be
3410 proper to subtract the symbol's value,
3411 osec->vma, from the emitted reloc addend,
3412 but ld.so expects buggy relocs. */
3413 osec
= sec
->output_section
;
3414 sindx
= elf_section_data (osec
)->dynindx
;
3417 asection
*oi
= htab
->elf
.text_index_section
;
3418 sindx
= elf_section_data (oi
)->dynindx
;
3420 BFD_ASSERT (sindx
!= 0);
3423 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3424 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3428 sreloc
= elf_section_data (input_section
)->sreloc
;
3430 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3432 r
= bfd_reloc_notsupported
;
3433 goto check_relocation_error
;
3436 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3438 /* If this reloc is against an external symbol, we do
3439 not want to fiddle with the addend. Otherwise, we
3440 need to include the symbol value so that it becomes
3441 an addend for the dynamic reloc. */
3448 case R_X86_64_TLSGD
:
3449 case R_X86_64_GOTPC32_TLSDESC
:
3450 case R_X86_64_TLSDESC_CALL
:
3451 case R_X86_64_GOTTPOFF
:
3452 tls_type
= GOT_UNKNOWN
;
3453 if (h
== NULL
&& local_got_offsets
)
3454 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3456 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3458 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3459 input_section
, contents
,
3460 symtab_hdr
, sym_hashes
,
3461 &r_type
, tls_type
, rel
,
3462 relend
, h
, r_symndx
))
3465 if (r_type
== R_X86_64_TPOFF32
)
3467 bfd_vma roff
= rel
->r_offset
;
3469 BFD_ASSERT (! unresolved_reloc
);
3471 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3473 /* GD->LE transition. For 64bit, change
3474 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3475 .word 0x6666; rex64; call __tls_get_addr
3478 leaq foo@tpoff(%rax), %rax
3480 leaq foo@tlsgd(%rip), %rdi
3481 .word 0x6666; rex64; call __tls_get_addr
3484 leaq foo@tpoff(%rax), %rax */
3485 if (ABI_64_P (output_bfd
))
3486 memcpy (contents
+ roff
- 4,
3487 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3490 memcpy (contents
+ roff
- 3,
3491 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3493 bfd_put_32 (output_bfd
,
3494 elf_x86_64_tpoff (info
, relocation
),
3495 contents
+ roff
+ 8);
3496 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3500 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3502 /* GDesc -> LE transition.
3503 It's originally something like:
3504 leaq x@tlsdesc(%rip), %rax
3507 movl $x@tpoff, %rax. */
3509 unsigned int val
, type
;
3511 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3512 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3513 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3514 contents
+ roff
- 3);
3515 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3516 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3517 contents
+ roff
- 1);
3518 bfd_put_32 (output_bfd
,
3519 elf_x86_64_tpoff (info
, relocation
),
3523 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3525 /* GDesc -> LE transition.
3530 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3531 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3534 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3536 /* IE->LE transition:
3537 Originally it can be one of:
3538 movq foo@gottpoff(%rip), %reg
3539 addq foo@gottpoff(%rip), %reg
3542 leaq foo(%reg), %reg
3545 unsigned int val
, type
, reg
;
3547 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3548 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3549 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3555 bfd_put_8 (output_bfd
, 0x49,
3556 contents
+ roff
- 3);
3557 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3558 bfd_put_8 (output_bfd
, 0x41,
3559 contents
+ roff
- 3);
3560 bfd_put_8 (output_bfd
, 0xc7,
3561 contents
+ roff
- 2);
3562 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3563 contents
+ roff
- 1);
3567 /* addq -> addq - addressing with %rsp/%r12 is
3570 bfd_put_8 (output_bfd
, 0x49,
3571 contents
+ roff
- 3);
3572 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3573 bfd_put_8 (output_bfd
, 0x41,
3574 contents
+ roff
- 3);
3575 bfd_put_8 (output_bfd
, 0x81,
3576 contents
+ roff
- 2);
3577 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3578 contents
+ roff
- 1);
3584 bfd_put_8 (output_bfd
, 0x4d,
3585 contents
+ roff
- 3);
3586 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3587 bfd_put_8 (output_bfd
, 0x45,
3588 contents
+ roff
- 3);
3589 bfd_put_8 (output_bfd
, 0x8d,
3590 contents
+ roff
- 2);
3591 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3592 contents
+ roff
- 1);
3594 bfd_put_32 (output_bfd
,
3595 elf_x86_64_tpoff (info
, relocation
),
3603 if (htab
->elf
.sgot
== NULL
)
3608 off
= h
->got
.offset
;
3609 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
3613 if (local_got_offsets
== NULL
)
3616 off
= local_got_offsets
[r_symndx
];
3617 offplt
= local_tlsdesc_gotents
[r_symndx
];
3624 Elf_Internal_Rela outrel
;
3628 if (htab
->elf
.srelgot
== NULL
)
3631 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3633 if (GOT_TLS_GDESC_P (tls_type
))
3635 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3636 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3637 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3638 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3639 + htab
->elf
.sgotplt
->output_offset
3641 + htab
->sgotplt_jump_table_size
);
3642 sreloc
= htab
->elf
.srelplt
;
3644 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3646 outrel
.r_addend
= 0;
3647 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3650 sreloc
= htab
->elf
.srelgot
;
3652 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3653 + htab
->elf
.sgot
->output_offset
+ off
);
3655 if (GOT_TLS_GD_P (tls_type
))
3656 dr_type
= R_X86_64_DTPMOD64
;
3657 else if (GOT_TLS_GDESC_P (tls_type
))
3660 dr_type
= R_X86_64_TPOFF64
;
3662 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3663 outrel
.r_addend
= 0;
3664 if ((dr_type
== R_X86_64_TPOFF64
3665 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3666 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3667 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
3669 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3671 if (GOT_TLS_GD_P (tls_type
))
3675 BFD_ASSERT (! unresolved_reloc
);
3676 bfd_put_64 (output_bfd
,
3677 relocation
- elf_x86_64_dtpoff_base (info
),
3678 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3682 bfd_put_64 (output_bfd
, 0,
3683 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3684 outrel
.r_info
= htab
->r_info (indx
,
3686 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3687 elf_append_rela (output_bfd
, sreloc
,
3696 local_got_offsets
[r_symndx
] |= 1;
3699 if (off
>= (bfd_vma
) -2
3700 && ! GOT_TLS_GDESC_P (tls_type
))
3702 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
3704 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3705 || r_type
== R_X86_64_TLSDESC_CALL
)
3706 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3707 + htab
->elf
.sgotplt
->output_offset
3708 + offplt
+ htab
->sgotplt_jump_table_size
;
3710 relocation
= htab
->elf
.sgot
->output_section
->vma
3711 + htab
->elf
.sgot
->output_offset
+ off
;
3712 unresolved_reloc
= FALSE
;
3716 bfd_vma roff
= rel
->r_offset
;
3718 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3720 /* GD->IE transition. For 64bit, change
3721 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3722 .word 0x6666; rex64; call __tls_get_addr@plt
3725 addq foo@gottpoff(%rip), %rax
3727 leaq foo@tlsgd(%rip), %rdi
3728 .word 0x6666; rex64; call __tls_get_addr@plt
3731 addq foo@gottpoff(%rip), %rax */
3732 if (ABI_64_P (output_bfd
))
3733 memcpy (contents
+ roff
- 4,
3734 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3737 memcpy (contents
+ roff
- 3,
3738 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3741 relocation
= (htab
->elf
.sgot
->output_section
->vma
3742 + htab
->elf
.sgot
->output_offset
+ off
3744 - input_section
->output_section
->vma
3745 - input_section
->output_offset
3747 bfd_put_32 (output_bfd
, relocation
,
3748 contents
+ roff
+ 8);
3749 /* Skip R_X86_64_PLT32. */
3753 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3755 /* GDesc -> IE transition.
3756 It's originally something like:
3757 leaq x@tlsdesc(%rip), %rax
3760 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3762 /* Now modify the instruction as appropriate. To
3763 turn a leaq into a movq in the form we use it, it
3764 suffices to change the second byte from 0x8d to
3766 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3768 bfd_put_32 (output_bfd
,
3769 htab
->elf
.sgot
->output_section
->vma
3770 + htab
->elf
.sgot
->output_offset
+ off
3772 - input_section
->output_section
->vma
3773 - input_section
->output_offset
3778 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3780 /* GDesc -> IE transition.
3787 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3788 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3796 case R_X86_64_TLSLD
:
3797 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3798 input_section
, contents
,
3799 symtab_hdr
, sym_hashes
,
3800 &r_type
, GOT_UNKNOWN
,
3801 rel
, relend
, h
, r_symndx
))
3804 if (r_type
!= R_X86_64_TLSLD
)
3806 /* LD->LE transition:
3807 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3808 For 64bit, we change it into:
3809 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
3810 For 32bit, we change it into:
3811 nopl 0x0(%rax); movl %fs:0, %eax. */
3813 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3814 if (ABI_64_P (output_bfd
))
3815 memcpy (contents
+ rel
->r_offset
- 3,
3816 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3818 memcpy (contents
+ rel
->r_offset
- 3,
3819 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
3820 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3825 if (htab
->elf
.sgot
== NULL
)
3828 off
= htab
->tls_ld_got
.offset
;
3833 Elf_Internal_Rela outrel
;
3835 if (htab
->elf
.srelgot
== NULL
)
3838 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3839 + htab
->elf
.sgot
->output_offset
+ off
);
3841 bfd_put_64 (output_bfd
, 0,
3842 htab
->elf
.sgot
->contents
+ off
);
3843 bfd_put_64 (output_bfd
, 0,
3844 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3845 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
3846 outrel
.r_addend
= 0;
3847 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
3849 htab
->tls_ld_got
.offset
|= 1;
3851 relocation
= htab
->elf
.sgot
->output_section
->vma
3852 + htab
->elf
.sgot
->output_offset
+ off
;
3853 unresolved_reloc
= FALSE
;
3856 case R_X86_64_DTPOFF32
:
3857 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
3858 relocation
-= elf_x86_64_dtpoff_base (info
);
3860 relocation
= elf_x86_64_tpoff (info
, relocation
);
3863 case R_X86_64_TPOFF32
:
3864 BFD_ASSERT (info
->executable
);
3865 relocation
= elf_x86_64_tpoff (info
, relocation
);
3872 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3873 because such sections are not SEC_ALLOC and thus ld.so will
3874 not process them. */
3875 if (unresolved_reloc
3876 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3878 (*_bfd_error_handler
)
3879 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3882 (long) rel
->r_offset
,
3884 h
->root
.root
.string
);
3887 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3888 contents
, rel
->r_offset
,
3889 relocation
, rel
->r_addend
);
3891 check_relocation_error
:
3892 if (r
!= bfd_reloc_ok
)
3897 name
= h
->root
.root
.string
;
3900 name
= bfd_elf_string_from_elf_section (input_bfd
,
3901 symtab_hdr
->sh_link
,
3906 name
= bfd_section_name (input_bfd
, sec
);
3909 if (r
== bfd_reloc_overflow
)
3911 if (! ((*info
->callbacks
->reloc_overflow
)
3912 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3913 (bfd_vma
) 0, input_bfd
, input_section
,
3919 (*_bfd_error_handler
)
3920 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3921 input_bfd
, input_section
,
3922 (long) rel
->r_offset
, name
, (int) r
);
3931 /* Finish up dynamic symbol handling. We set the contents of various
3932 dynamic sections here. */
3935 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3936 struct bfd_link_info
*info
,
3937 struct elf_link_hash_entry
*h
,
3938 Elf_Internal_Sym
*sym
)
3940 struct elf_x86_64_link_hash_table
*htab
;
3942 htab
= elf_x86_64_hash_table (info
);
3946 if (h
->plt
.offset
!= (bfd_vma
) -1)
3950 Elf_Internal_Rela rela
;
3952 asection
*plt
, *gotplt
, *relplt
;
3953 const struct elf_backend_data
*bed
;
3955 /* When building a static executable, use .iplt, .igot.plt and
3956 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3957 if (htab
->elf
.splt
!= NULL
)
3959 plt
= htab
->elf
.splt
;
3960 gotplt
= htab
->elf
.sgotplt
;
3961 relplt
= htab
->elf
.srelplt
;
3965 plt
= htab
->elf
.iplt
;
3966 gotplt
= htab
->elf
.igotplt
;
3967 relplt
= htab
->elf
.irelplt
;
3970 /* This symbol has an entry in the procedure linkage table. Set
3972 if ((h
->dynindx
== -1
3973 && !((h
->forced_local
|| info
->executable
)
3975 && h
->type
== STT_GNU_IFUNC
))
3981 /* Get the index in the procedure linkage table which
3982 corresponds to this symbol. This is the index of this symbol
3983 in all the symbols for which we are making plt entries. The
3984 first entry in the procedure linkage table is reserved.
3986 Get the offset into the .got table of the entry that
3987 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3988 bytes. The first three are reserved for the dynamic linker.
3990 For static executables, we don't reserve anything. */
3992 if (plt
== htab
->elf
.splt
)
3994 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3995 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3999 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
4000 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
4003 /* Fill in the entry in the procedure linkage table. */
4004 memcpy (plt
->contents
+ h
->plt
.offset
, elf_x86_64_plt_entry
,
4007 /* Insert the relocation positions of the plt section. The magic
4008 numbers at the end of the statements are the positions of the
4009 relocations in the plt section. */
4010 /* Put offset for jmp *name@GOTPCREL(%rip), since the
4011 instruction uses 6 bytes, subtract this value. */
4012 bfd_put_32 (output_bfd
,
4013 (gotplt
->output_section
->vma
4014 + gotplt
->output_offset
4016 - plt
->output_section
->vma
4017 - plt
->output_offset
4020 plt
->contents
+ h
->plt
.offset
+ 2);
4022 /* Don't fill PLT entry for static executables. */
4023 if (plt
== htab
->elf
.splt
)
4025 /* Put relocation index. */
4026 bfd_put_32 (output_bfd
, plt_index
,
4027 plt
->contents
+ h
->plt
.offset
+ 7);
4028 /* Put offset for jmp .PLT0. */
4029 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
4030 plt
->contents
+ h
->plt
.offset
+ 12);
4033 /* Fill in the entry in the global offset table, initially this
4034 points to the pushq instruction in the PLT which is at offset 6. */
4035 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4036 + plt
->output_offset
4037 + h
->plt
.offset
+ 6),
4038 gotplt
->contents
+ got_offset
);
4040 /* Fill in the entry in the .rela.plt section. */
4041 rela
.r_offset
= (gotplt
->output_section
->vma
4042 + gotplt
->output_offset
4044 if (h
->dynindx
== -1
4045 || ((info
->executable
4046 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4048 && h
->type
== STT_GNU_IFUNC
))
4050 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4051 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4052 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4053 rela
.r_addend
= (h
->root
.u
.def
.value
4054 + h
->root
.u
.def
.section
->output_section
->vma
4055 + h
->root
.u
.def
.section
->output_offset
);
4059 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4063 bed
= get_elf_backend_data (output_bfd
);
4064 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4065 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4067 if (!h
->def_regular
)
4069 /* Mark the symbol as undefined, rather than as defined in
4070 the .plt section. Leave the value if there were any
4071 relocations where pointer equality matters (this is a clue
4072 for the dynamic linker, to make function pointer
4073 comparisons work between an application and shared
4074 library), otherwise set it to zero. If a function is only
4075 called from a binary, there is no need to slow down
4076 shared libraries because of that. */
4077 sym
->st_shndx
= SHN_UNDEF
;
4078 if (!h
->pointer_equality_needed
)
4083 if (h
->got
.offset
!= (bfd_vma
) -1
4084 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
4085 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4087 Elf_Internal_Rela rela
;
4089 /* This symbol has an entry in the global offset table. Set it
4091 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4094 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4095 + htab
->elf
.sgot
->output_offset
4096 + (h
->got
.offset
&~ (bfd_vma
) 1));
4098 /* If this is a static link, or it is a -Bsymbolic link and the
4099 symbol is defined locally or was forced to be local because
4100 of a version file, we just want to emit a RELATIVE reloc.
4101 The entry in the global offset table will already have been
4102 initialized in the relocate_section function. */
4104 && h
->type
== STT_GNU_IFUNC
)
4108 /* Generate R_X86_64_GLOB_DAT. */
4115 if (!h
->pointer_equality_needed
)
4118 /* For non-shared object, we can't use .got.plt, which
4119 contains the real function addres if we need pointer
4120 equality. We load the GOT entry with the PLT entry. */
4121 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4122 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4123 + plt
->output_offset
4125 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4129 else if (info
->shared
4130 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4132 if (!h
->def_regular
)
4134 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4135 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4136 rela
.r_addend
= (h
->root
.u
.def
.value
4137 + h
->root
.u
.def
.section
->output_section
->vma
4138 + h
->root
.u
.def
.section
->output_offset
);
4142 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4144 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4145 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4146 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4150 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
4155 Elf_Internal_Rela rela
;
4157 /* This symbol needs a copy reloc. Set it up. */
4159 if (h
->dynindx
== -1
4160 || (h
->root
.type
!= bfd_link_hash_defined
4161 && h
->root
.type
!= bfd_link_hash_defweak
)
4162 || htab
->srelbss
== NULL
)
4165 rela
.r_offset
= (h
->root
.u
.def
.value
4166 + h
->root
.u
.def
.section
->output_section
->vma
4167 + h
->root
.u
.def
.section
->output_offset
);
4168 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4170 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
4173 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4174 be NULL for local symbols. */
4176 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4177 || h
== htab
->elf
.hgot
))
4178 sym
->st_shndx
= SHN_ABS
;
4183 /* Finish up local dynamic symbol handling. We set the contents of
4184 various dynamic sections here. */
4187 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4189 struct elf_link_hash_entry
*h
4190 = (struct elf_link_hash_entry
*) *slot
;
4191 struct bfd_link_info
*info
4192 = (struct bfd_link_info
*) inf
;
4194 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4198 /* Used to decide how to sort relocs in an optimal manner for the
4199 dynamic linker, before writing them out. */
4201 static enum elf_reloc_type_class
4202 elf_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4204 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4206 case R_X86_64_RELATIVE
:
4207 return reloc_class_relative
;
4208 case R_X86_64_JUMP_SLOT
:
4209 return reloc_class_plt
;
4211 return reloc_class_copy
;
4213 return reloc_class_normal
;
4217 /* Finish up the dynamic sections. */
4220 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4221 struct bfd_link_info
*info
)
4223 struct elf_x86_64_link_hash_table
*htab
;
4227 htab
= elf_x86_64_hash_table (info
);
4231 dynobj
= htab
->elf
.dynobj
;
4232 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4234 if (htab
->elf
.dynamic_sections_created
)
4236 bfd_byte
*dyncon
, *dynconend
;
4237 const struct elf_backend_data
*bed
;
4238 bfd_size_type sizeof_dyn
;
4240 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4243 bed
= get_elf_backend_data (dynobj
);
4244 sizeof_dyn
= bed
->s
->sizeof_dyn
;
4245 dyncon
= sdyn
->contents
;
4246 dynconend
= sdyn
->contents
+ sdyn
->size
;
4247 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
4249 Elf_Internal_Dyn dyn
;
4252 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
4260 s
= htab
->elf
.sgotplt
;
4261 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4265 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4269 s
= htab
->elf
.srelplt
->output_section
;
4270 dyn
.d_un
.d_val
= s
->size
;
4274 /* The procedure linkage table relocs (DT_JMPREL) should
4275 not be included in the overall relocs (DT_RELA).
4276 Therefore, we override the DT_RELASZ entry here to
4277 make it not include the JMPREL relocs. Since the
4278 linker script arranges for .rela.plt to follow all
4279 other relocation sections, we don't have to worry
4280 about changing the DT_RELA entry. */
4281 if (htab
->elf
.srelplt
!= NULL
)
4283 s
= htab
->elf
.srelplt
->output_section
;
4284 dyn
.d_un
.d_val
-= s
->size
;
4288 case DT_TLSDESC_PLT
:
4290 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4291 + htab
->tlsdesc_plt
;
4294 case DT_TLSDESC_GOT
:
4296 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4297 + htab
->tlsdesc_got
;
4301 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
4304 /* Fill in the special first entry in the procedure linkage table. */
4305 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4307 /* Fill in the first entry in the procedure linkage table. */
4308 memcpy (htab
->elf
.splt
->contents
, elf_x86_64_plt0_entry
,
4310 /* Add offset for pushq GOT+8(%rip), since the instruction
4311 uses 6 bytes subtract this value. */
4312 bfd_put_32 (output_bfd
,
4313 (htab
->elf
.sgotplt
->output_section
->vma
4314 + htab
->elf
.sgotplt
->output_offset
4316 - htab
->elf
.splt
->output_section
->vma
4317 - htab
->elf
.splt
->output_offset
4319 htab
->elf
.splt
->contents
+ 2);
4320 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4321 the end of the instruction. */
4322 bfd_put_32 (output_bfd
,
4323 (htab
->elf
.sgotplt
->output_section
->vma
4324 + htab
->elf
.sgotplt
->output_offset
4326 - htab
->elf
.splt
->output_section
->vma
4327 - htab
->elf
.splt
->output_offset
4329 htab
->elf
.splt
->contents
+ 8);
4331 elf_section_data (htab
->elf
.splt
->output_section
)->this_hdr
.sh_entsize
=
4334 if (htab
->tlsdesc_plt
)
4336 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4337 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4339 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4340 elf_x86_64_plt0_entry
,
4343 /* Add offset for pushq GOT+8(%rip), since the
4344 instruction uses 6 bytes subtract this value. */
4345 bfd_put_32 (output_bfd
,
4346 (htab
->elf
.sgotplt
->output_section
->vma
4347 + htab
->elf
.sgotplt
->output_offset
4349 - htab
->elf
.splt
->output_section
->vma
4350 - htab
->elf
.splt
->output_offset
4353 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4354 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4355 htab->tlsdesc_got. The 12 is the offset to the end of
4357 bfd_put_32 (output_bfd
,
4358 (htab
->elf
.sgot
->output_section
->vma
4359 + htab
->elf
.sgot
->output_offset
4361 - htab
->elf
.splt
->output_section
->vma
4362 - htab
->elf
.splt
->output_offset
4365 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4370 if (htab
->elf
.sgotplt
)
4372 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4374 (*_bfd_error_handler
)
4375 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4379 /* Fill in the first three entries in the global offset table. */
4380 if (htab
->elf
.sgotplt
->size
> 0)
4382 /* Set the first entry in the global offset table to the address of
4383 the dynamic section. */
4385 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4387 bfd_put_64 (output_bfd
,
4388 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4389 htab
->elf
.sgotplt
->contents
);
4390 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4391 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4392 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4395 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4399 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4400 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4403 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4404 htab_traverse (htab
->loc_hash_table
,
4405 elf_x86_64_finish_local_dynamic_symbol
,
4411 /* Return address for Ith PLT stub in section PLT, for relocation REL
4412 or (bfd_vma) -1 if it should not be included. */
4415 elf_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4416 const arelent
*rel ATTRIBUTE_UNUSED
)
4418 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4421 /* Handle an x86-64 specific section when reading an object file. This
4422 is called when elfcode.h finds a section with an unknown type. */
4425 elf_x86_64_section_from_shdr (bfd
*abfd
,
4426 Elf_Internal_Shdr
*hdr
,
4430 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4433 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4439 /* Hook called by the linker routine which adds symbols from an object
4440 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4444 elf_x86_64_add_symbol_hook (bfd
*abfd
,
4445 struct bfd_link_info
*info
,
4446 Elf_Internal_Sym
*sym
,
4447 const char **namep ATTRIBUTE_UNUSED
,
4448 flagword
*flagsp ATTRIBUTE_UNUSED
,
4454 switch (sym
->st_shndx
)
4456 case SHN_X86_64_LCOMMON
:
4457 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4460 lcomm
= bfd_make_section_with_flags (abfd
,
4464 | SEC_LINKER_CREATED
));
4467 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4470 *valp
= sym
->st_size
;
4474 if ((abfd
->flags
& DYNAMIC
) == 0
4475 && (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
4476 || ELF_ST_BIND (sym
->st_info
) == STB_GNU_UNIQUE
))
4477 elf_tdata (info
->output_bfd
)->has_gnu_symbols
= TRUE
;
4483 /* Given a BFD section, try to locate the corresponding ELF section
4487 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4488 asection
*sec
, int *index_return
)
4490 if (sec
== &_bfd_elf_large_com_section
)
4492 *index_return
= SHN_X86_64_LCOMMON
;
4498 /* Process a symbol. */
4501 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4504 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4506 switch (elfsym
->internal_elf_sym
.st_shndx
)
4508 case SHN_X86_64_LCOMMON
:
4509 asym
->section
= &_bfd_elf_large_com_section
;
4510 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4511 /* Common symbol doesn't set BSF_GLOBAL. */
4512 asym
->flags
&= ~BSF_GLOBAL
;
4518 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4520 return (sym
->st_shndx
== SHN_COMMON
4521 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4525 elf_x86_64_common_section_index (asection
*sec
)
4527 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4530 return SHN_X86_64_LCOMMON
;
4534 elf_x86_64_common_section (asection
*sec
)
4536 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4537 return bfd_com_section_ptr
;
4539 return &_bfd_elf_large_com_section
;
4543 elf_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4544 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4545 struct elf_link_hash_entry
*h
,
4546 Elf_Internal_Sym
*sym
,
4548 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4549 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4550 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4551 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4552 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4553 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4554 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4555 bfd_boolean
*newdyn
,
4556 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4557 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4558 bfd
*abfd ATTRIBUTE_UNUSED
,
4560 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4561 bfd_boolean
*olddyn
,
4562 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4563 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4567 /* A normal common symbol and a large common symbol result in a
4568 normal common symbol. We turn the large common symbol into a
4571 && h
->root
.type
== bfd_link_hash_common
4573 && bfd_is_com_section (*sec
)
4576 if (sym
->st_shndx
== SHN_COMMON
4577 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4579 h
->root
.u
.c
.p
->section
4580 = bfd_make_section_old_way (oldbfd
, "COMMON");
4581 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4583 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4584 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4585 *psec
= *sec
= bfd_com_section_ptr
;
4592 elf_x86_64_additional_program_headers (bfd
*abfd
,
4593 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4598 /* Check to see if we need a large readonly segment. */
4599 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4600 if (s
&& (s
->flags
& SEC_LOAD
))
4603 /* Check to see if we need a large data segment. Since .lbss sections
4604 is placed right after the .bss section, there should be no need for
4605 a large data segment just because of .lbss. */
4606 s
= bfd_get_section_by_name (abfd
, ".ldata");
4607 if (s
&& (s
->flags
& SEC_LOAD
))
4613 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4616 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4618 if (h
->plt
.offset
!= (bfd_vma
) -1
4620 && !h
->pointer_equality_needed
)
4623 return _bfd_elf_hash_symbol (h
);
4626 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4629 elf_x86_64_relocs_compatible (const bfd_target
*input
,
4630 const bfd_target
*output
)
4632 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
4633 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
4634 && _bfd_elf_relocs_compatible (input
, output
));
4637 static const struct bfd_elf_special_section
4638 elf_x86_64_special_sections
[]=
4640 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4641 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4642 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4643 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4644 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4645 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4646 { NULL
, 0, 0, 0, 0 }
4649 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4650 #define TARGET_LITTLE_NAME "elf64-x86-64"
4651 #define ELF_ARCH bfd_arch_i386
4652 #define ELF_TARGET_ID X86_64_ELF_DATA
4653 #define ELF_MACHINE_CODE EM_X86_64
4654 #define ELF_MAXPAGESIZE 0x200000
4655 #define ELF_MINPAGESIZE 0x1000
4656 #define ELF_COMMONPAGESIZE 0x1000
4658 #define elf_backend_can_gc_sections 1
4659 #define elf_backend_can_refcount 1
4660 #define elf_backend_want_got_plt 1
4661 #define elf_backend_plt_readonly 1
4662 #define elf_backend_want_plt_sym 0
4663 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4664 #define elf_backend_rela_normal 1
4666 #define elf_info_to_howto elf_x86_64_info_to_howto
4668 #define bfd_elf64_bfd_link_hash_table_create \
4669 elf_x86_64_link_hash_table_create
4670 #define bfd_elf64_bfd_link_hash_table_free \
4671 elf_x86_64_link_hash_table_free
4672 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
4673 #define bfd_elf64_bfd_reloc_name_lookup \
4674 elf_x86_64_reloc_name_lookup
4676 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
4677 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
4678 #define elf_backend_check_relocs elf_x86_64_check_relocs
4679 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
4680 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
4681 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
4682 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
4683 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
4684 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
4685 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
4686 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
4687 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
4688 #define elf_backend_relocate_section elf_x86_64_relocate_section
4689 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
4690 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
4691 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4692 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
4693 #define elf_backend_object_p elf64_x86_64_elf_object_p
4694 #define bfd_elf64_mkobject elf_x86_64_mkobject
4696 #define elf_backend_section_from_shdr \
4697 elf_x86_64_section_from_shdr
4699 #define elf_backend_section_from_bfd_section \
4700 elf_x86_64_elf_section_from_bfd_section
4701 #define elf_backend_add_symbol_hook \
4702 elf_x86_64_add_symbol_hook
4703 #define elf_backend_symbol_processing \
4704 elf_x86_64_symbol_processing
4705 #define elf_backend_common_section_index \
4706 elf_x86_64_common_section_index
4707 #define elf_backend_common_section \
4708 elf_x86_64_common_section
4709 #define elf_backend_common_definition \
4710 elf_x86_64_common_definition
4711 #define elf_backend_merge_symbol \
4712 elf_x86_64_merge_symbol
4713 #define elf_backend_special_sections \
4714 elf_x86_64_special_sections
4715 #define elf_backend_additional_program_headers \
4716 elf_x86_64_additional_program_headers
4717 #define elf_backend_hash_symbol \
4718 elf_x86_64_hash_symbol
4720 #undef elf_backend_post_process_headers
4721 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4723 #include "elf64-target.h"
4725 /* FreeBSD support. */
4727 #undef TARGET_LITTLE_SYM
4728 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4729 #undef TARGET_LITTLE_NAME
4730 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4733 #define ELF_OSABI ELFOSABI_FREEBSD
4736 #define elf64_bed elf64_x86_64_fbsd_bed
4738 #include "elf64-target.h"
4740 /* Solaris 2 support. */
4742 #undef TARGET_LITTLE_SYM
4743 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4744 #undef TARGET_LITTLE_NAME
4745 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4747 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4748 objects won't be recognized. */
4752 #define elf64_bed elf64_x86_64_sol2_bed
4754 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
4756 #undef elf_backend_static_tls_alignment
4757 #define elf_backend_static_tls_alignment 16
4759 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4761 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4763 #undef elf_backend_want_plt_sym
4764 #define elf_backend_want_plt_sym 1
4766 #include "elf64-target.h"
4768 /* Intel L1OM support. */
4771 elf64_l1om_elf_object_p (bfd
*abfd
)
4773 /* Set the right machine number for an L1OM elf64 file. */
4774 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
4778 #undef TARGET_LITTLE_SYM
4779 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4780 #undef TARGET_LITTLE_NAME
4781 #define TARGET_LITTLE_NAME "elf64-l1om"
4783 #define ELF_ARCH bfd_arch_l1om
4785 #undef ELF_MACHINE_CODE
4786 #define ELF_MACHINE_CODE EM_L1OM
4791 #define elf64_bed elf64_l1om_bed
4793 #undef elf_backend_object_p
4794 #define elf_backend_object_p elf64_l1om_elf_object_p
4796 #undef elf_backend_post_process_headers
4797 #undef elf_backend_static_tls_alignment
4799 #undef elf_backend_want_plt_sym
4800 #define elf_backend_want_plt_sym 0
4802 #include "elf64-target.h"
4804 /* FreeBSD L1OM support. */
4806 #undef TARGET_LITTLE_SYM
4807 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4808 #undef TARGET_LITTLE_NAME
4809 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4812 #define ELF_OSABI ELFOSABI_FREEBSD
4815 #define elf64_bed elf64_l1om_fbsd_bed
4817 #undef elf_backend_post_process_headers
4818 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4820 #include "elf64-target.h"
4822 /* 32bit x86-64 support. */
4825 elf32_x86_64_elf_object_p (bfd
*abfd
)
4827 /* Set the right machine number for an x86-64 elf32 file. */
4828 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
4832 #undef TARGET_LITTLE_SYM
4833 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
4834 #undef TARGET_LITTLE_NAME
4835 #define TARGET_LITTLE_NAME "elf32-x86-64"
4838 #define ELF_ARCH bfd_arch_i386
4840 #undef ELF_MACHINE_CODE
4841 #define ELF_MACHINE_CODE EM_X86_64
4843 #define bfd_elf32_bfd_link_hash_table_create \
4844 elf_x86_64_link_hash_table_create
4845 #define bfd_elf32_bfd_link_hash_table_free \
4846 elf_x86_64_link_hash_table_free
4847 #define bfd_elf32_bfd_reloc_type_lookup \
4848 elf_x86_64_reloc_type_lookup
4849 #define bfd_elf32_bfd_reloc_name_lookup \
4850 elf_x86_64_reloc_name_lookup
4851 #define bfd_elf32_mkobject \
4856 #undef elf_backend_post_process_headers
4858 #undef elf_backend_object_p
4859 #define elf_backend_object_p \
4860 elf32_x86_64_elf_object_p
4862 #undef elf_backend_bfd_from_remote_memory
4863 #define elf_backend_bfd_from_remote_memory \
4864 _bfd_elf32_bfd_from_remote_memory
4866 #undef elf_backend_size_info
4867 #define elf_backend_size_info \
4868 _bfd_elf32_size_info
4870 #include "elf32-target.h"