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 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2303 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2305 asection
*s
= p
->sec
->output_section
;
2307 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2309 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2311 info
->flags
|= DF_TEXTREL
;
2313 /* Not an error, just cut short the traversal. */
2320 /* Set the sizes of the dynamic sections. */
2323 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
2324 struct bfd_link_info
*info
)
2326 struct elf_x86_64_link_hash_table
*htab
;
2331 const struct elf_backend_data
*bed
;
2333 htab
= elf_x86_64_hash_table (info
);
2336 bed
= get_elf_backend_data (output_bfd
);
2338 dynobj
= htab
->elf
.dynobj
;
2342 if (htab
->elf
.dynamic_sections_created
)
2344 /* Set the contents of the .interp section to the interpreter. */
2345 if (info
->executable
)
2347 s
= bfd_get_section_by_name (dynobj
, ".interp");
2350 s
->size
= htab
->dynamic_interpreter_size
;
2351 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2355 /* Set up .got offsets for local syms, and space for local dynamic
2357 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2359 bfd_signed_vma
*local_got
;
2360 bfd_signed_vma
*end_local_got
;
2361 char *local_tls_type
;
2362 bfd_vma
*local_tlsdesc_gotent
;
2363 bfd_size_type locsymcount
;
2364 Elf_Internal_Shdr
*symtab_hdr
;
2367 if (! is_x86_64_elf (ibfd
))
2370 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2372 struct elf_dyn_relocs
*p
;
2374 for (p
= (struct elf_dyn_relocs
*)
2375 (elf_section_data (s
)->local_dynrel
);
2379 if (!bfd_is_abs_section (p
->sec
)
2380 && bfd_is_abs_section (p
->sec
->output_section
))
2382 /* Input section has been discarded, either because
2383 it is a copy of a linkonce section or due to
2384 linker script /DISCARD/, so we'll be discarding
2387 else if (p
->count
!= 0)
2389 srel
= elf_section_data (p
->sec
)->sreloc
;
2390 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2391 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2392 info
->flags
|= DF_TEXTREL
;
2397 local_got
= elf_local_got_refcounts (ibfd
);
2401 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2402 locsymcount
= symtab_hdr
->sh_info
;
2403 end_local_got
= local_got
+ locsymcount
;
2404 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
2405 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
2407 srel
= htab
->elf
.srelgot
;
2408 for (; local_got
< end_local_got
;
2409 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2411 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2414 if (GOT_TLS_GDESC_P (*local_tls_type
))
2416 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2417 - elf_x86_64_compute_jump_table_size (htab
);
2418 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2419 *local_got
= (bfd_vma
) -2;
2421 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2422 || GOT_TLS_GD_P (*local_tls_type
))
2424 *local_got
= s
->size
;
2425 s
->size
+= GOT_ENTRY_SIZE
;
2426 if (GOT_TLS_GD_P (*local_tls_type
))
2427 s
->size
+= GOT_ENTRY_SIZE
;
2430 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2431 || *local_tls_type
== GOT_TLS_IE
)
2433 if (GOT_TLS_GDESC_P (*local_tls_type
))
2435 htab
->elf
.srelplt
->size
2436 += bed
->s
->sizeof_rela
;
2437 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2439 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2440 || GOT_TLS_GD_P (*local_tls_type
))
2441 srel
->size
+= bed
->s
->sizeof_rela
;
2445 *local_got
= (bfd_vma
) -1;
2449 if (htab
->tls_ld_got
.refcount
> 0)
2451 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2453 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2454 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2455 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2458 htab
->tls_ld_got
.offset
= -1;
2460 /* Allocate global sym .plt and .got entries, and space for global
2461 sym dynamic relocs. */
2462 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
2465 /* Allocate .plt and .got entries, and space for local symbols. */
2466 htab_traverse (htab
->loc_hash_table
,
2467 elf_x86_64_allocate_local_dynrelocs
,
2470 /* For every jump slot reserved in the sgotplt, reloc_count is
2471 incremented. However, when we reserve space for TLS descriptors,
2472 it's not incremented, so in order to compute the space reserved
2473 for them, it suffices to multiply the reloc count by the jump
2475 if (htab
->elf
.srelplt
)
2476 htab
->sgotplt_jump_table_size
2477 = elf_x86_64_compute_jump_table_size (htab
);
2479 if (htab
->tlsdesc_plt
)
2481 /* If we're not using lazy TLS relocations, don't generate the
2482 PLT and GOT entries they require. */
2483 if ((info
->flags
& DF_BIND_NOW
))
2484 htab
->tlsdesc_plt
= 0;
2487 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2488 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2489 /* Reserve room for the initial entry.
2490 FIXME: we could probably do away with it in this case. */
2491 if (htab
->elf
.splt
->size
== 0)
2492 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2493 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2494 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2498 if (htab
->elf
.sgotplt
)
2500 struct elf_link_hash_entry
*got
;
2501 got
= elf_link_hash_lookup (elf_hash_table (info
),
2502 "_GLOBAL_OFFSET_TABLE_",
2503 FALSE
, FALSE
, FALSE
);
2505 /* Don't allocate .got.plt section if there are no GOT nor PLT
2506 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2508 || !got
->ref_regular_nonweak
)
2509 && (htab
->elf
.sgotplt
->size
2510 == get_elf_backend_data (output_bfd
)->got_header_size
)
2511 && (htab
->elf
.splt
== NULL
2512 || htab
->elf
.splt
->size
== 0)
2513 && (htab
->elf
.sgot
== NULL
2514 || htab
->elf
.sgot
->size
== 0)
2515 && (htab
->elf
.iplt
== NULL
2516 || htab
->elf
.iplt
->size
== 0)
2517 && (htab
->elf
.igotplt
== NULL
2518 || htab
->elf
.igotplt
->size
== 0))
2519 htab
->elf
.sgotplt
->size
= 0;
2522 /* We now have determined the sizes of the various dynamic sections.
2523 Allocate memory for them. */
2525 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2527 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2530 if (s
== htab
->elf
.splt
2531 || s
== htab
->elf
.sgot
2532 || s
== htab
->elf
.sgotplt
2533 || s
== htab
->elf
.iplt
2534 || s
== htab
->elf
.igotplt
2535 || s
== htab
->sdynbss
)
2537 /* Strip this section if we don't need it; see the
2540 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2542 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2545 /* We use the reloc_count field as a counter if we need
2546 to copy relocs into the output file. */
2547 if (s
!= htab
->elf
.srelplt
)
2552 /* It's not one of our sections, so don't allocate space. */
2558 /* If we don't need this section, strip it from the
2559 output file. This is mostly to handle .rela.bss and
2560 .rela.plt. We must create both sections in
2561 create_dynamic_sections, because they must be created
2562 before the linker maps input sections to output
2563 sections. The linker does that before
2564 adjust_dynamic_symbol is called, and it is that
2565 function which decides whether anything needs to go
2566 into these sections. */
2568 s
->flags
|= SEC_EXCLUDE
;
2572 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2575 /* Allocate memory for the section contents. We use bfd_zalloc
2576 here in case unused entries are not reclaimed before the
2577 section's contents are written out. This should not happen,
2578 but this way if it does, we get a R_X86_64_NONE reloc instead
2580 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2581 if (s
->contents
== NULL
)
2585 if (htab
->elf
.dynamic_sections_created
)
2587 /* Add some entries to the .dynamic section. We fill in the
2588 values later, in elf_x86_64_finish_dynamic_sections, but we
2589 must add the entries now so that we get the correct size for
2590 the .dynamic section. The DT_DEBUG entry is filled in by the
2591 dynamic linker and used by the debugger. */
2592 #define add_dynamic_entry(TAG, VAL) \
2593 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2595 if (info
->executable
)
2597 if (!add_dynamic_entry (DT_DEBUG
, 0))
2601 if (htab
->elf
.splt
->size
!= 0)
2603 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2604 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2605 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2606 || !add_dynamic_entry (DT_JMPREL
, 0))
2609 if (htab
->tlsdesc_plt
2610 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2611 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2617 if (!add_dynamic_entry (DT_RELA
, 0)
2618 || !add_dynamic_entry (DT_RELASZ
, 0)
2619 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
2622 /* If any dynamic relocs apply to a read-only section,
2623 then we need a DT_TEXTREL entry. */
2624 if ((info
->flags
& DF_TEXTREL
) == 0)
2625 elf_link_hash_traverse (&htab
->elf
,
2626 elf_x86_64_readonly_dynrelocs
,
2629 if ((info
->flags
& DF_TEXTREL
) != 0)
2631 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2636 #undef add_dynamic_entry
2642 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2643 struct bfd_link_info
*info
)
2645 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2649 struct elf_link_hash_entry
*tlsbase
;
2651 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2652 "_TLS_MODULE_BASE_",
2653 FALSE
, FALSE
, FALSE
);
2655 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2657 struct elf_x86_64_link_hash_table
*htab
;
2658 struct bfd_link_hash_entry
*bh
= NULL
;
2659 const struct elf_backend_data
*bed
2660 = get_elf_backend_data (output_bfd
);
2662 htab
= elf_x86_64_hash_table (info
);
2666 if (!(_bfd_generic_link_add_one_symbol
2667 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2668 tls_sec
, 0, NULL
, FALSE
,
2669 bed
->collect
, &bh
)))
2672 htab
->tls_module_base
= bh
;
2674 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2675 tlsbase
->def_regular
= 1;
2676 tlsbase
->other
= STV_HIDDEN
;
2677 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2684 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2685 executables. Rather than setting it to the beginning of the TLS
2686 section, we have to set it to the end. This function may be called
2687 multiple times, it is idempotent. */
2690 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2692 struct elf_x86_64_link_hash_table
*htab
;
2693 struct bfd_link_hash_entry
*base
;
2695 if (!info
->executable
)
2698 htab
= elf_x86_64_hash_table (info
);
2702 base
= htab
->tls_module_base
;
2706 base
->u
.def
.value
= htab
->elf
.tls_size
;
2709 /* Return the base VMA address which should be subtracted from real addresses
2710 when resolving @dtpoff relocation.
2711 This is PT_TLS segment p_vaddr. */
2714 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2716 /* If tls_sec is NULL, we should have signalled an error already. */
2717 if (elf_hash_table (info
)->tls_sec
== NULL
)
2719 return elf_hash_table (info
)->tls_sec
->vma
;
2722 /* Return the relocation value for @tpoff relocation
2723 if STT_TLS virtual address is ADDRESS. */
2726 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2728 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2729 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2730 bfd_vma static_tls_size
;
2732 /* If tls_segment is NULL, we should have signalled an error already. */
2733 if (htab
->tls_sec
== NULL
)
2736 /* Consider special static TLS alignment requirements. */
2737 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2738 return address
- static_tls_size
- htab
->tls_sec
->vma
;
2741 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2745 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2747 /* Opcode Instruction
2750 0x0f 0x8x conditional jump */
2752 && (contents
[offset
- 1] == 0xe8
2753 || contents
[offset
- 1] == 0xe9))
2755 && contents
[offset
- 2] == 0x0f
2756 && (contents
[offset
- 1] & 0xf0) == 0x80));
2759 /* Relocate an x86_64 ELF section. */
2762 elf_x86_64_relocate_section (bfd
*output_bfd
,
2763 struct bfd_link_info
*info
,
2765 asection
*input_section
,
2767 Elf_Internal_Rela
*relocs
,
2768 Elf_Internal_Sym
*local_syms
,
2769 asection
**local_sections
)
2771 struct elf_x86_64_link_hash_table
*htab
;
2772 Elf_Internal_Shdr
*symtab_hdr
;
2773 struct elf_link_hash_entry
**sym_hashes
;
2774 bfd_vma
*local_got_offsets
;
2775 bfd_vma
*local_tlsdesc_gotents
;
2776 Elf_Internal_Rela
*rel
;
2777 Elf_Internal_Rela
*relend
;
2779 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2781 htab
= elf_x86_64_hash_table (info
);
2784 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2785 sym_hashes
= elf_sym_hashes (input_bfd
);
2786 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2787 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
2789 elf_x86_64_set_tls_module_base (info
);
2792 relend
= relocs
+ input_section
->reloc_count
;
2793 for (; rel
< relend
; rel
++)
2795 unsigned int r_type
;
2796 reloc_howto_type
*howto
;
2797 unsigned long r_symndx
;
2798 struct elf_link_hash_entry
*h
;
2799 Elf_Internal_Sym
*sym
;
2801 bfd_vma off
, offplt
;
2803 bfd_boolean unresolved_reloc
;
2804 bfd_reloc_status_type r
;
2808 r_type
= ELF32_R_TYPE (rel
->r_info
);
2809 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2810 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2813 if (r_type
>= R_X86_64_max
)
2815 bfd_set_error (bfd_error_bad_value
);
2819 howto
= x86_64_elf_howto_table
+ r_type
;
2820 r_symndx
= htab
->r_sym (rel
->r_info
);
2824 unresolved_reloc
= FALSE
;
2825 if (r_symndx
< symtab_hdr
->sh_info
)
2827 sym
= local_syms
+ r_symndx
;
2828 sec
= local_sections
[r_symndx
];
2830 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2833 /* Relocate against local STT_GNU_IFUNC symbol. */
2834 if (!info
->relocatable
2835 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2837 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
2842 /* Set STT_GNU_IFUNC symbol value. */
2843 h
->root
.u
.def
.value
= sym
->st_value
;
2844 h
->root
.u
.def
.section
= sec
;
2849 bfd_boolean warned ATTRIBUTE_UNUSED
;
2851 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2852 r_symndx
, symtab_hdr
, sym_hashes
,
2854 unresolved_reloc
, warned
);
2857 if (sec
!= NULL
&& elf_discarded_section (sec
))
2858 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2859 rel
, relend
, howto
, contents
);
2861 if (info
->relocatable
)
2864 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2865 it here if it is defined in a non-shared object. */
2867 && h
->type
== STT_GNU_IFUNC
2874 if ((input_section
->flags
& SEC_ALLOC
) == 0
2875 || h
->plt
.offset
== (bfd_vma
) -1)
2878 /* STT_GNU_IFUNC symbol must go through PLT. */
2879 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
2880 relocation
= (plt
->output_section
->vma
2881 + plt
->output_offset
+ h
->plt
.offset
);
2886 if (h
->root
.root
.string
)
2887 name
= h
->root
.root
.string
;
2889 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2891 (*_bfd_error_handler
)
2892 (_("%B: relocation %s against STT_GNU_IFUNC "
2893 "symbol `%s' isn't handled by %s"), input_bfd
,
2894 x86_64_elf_howto_table
[r_type
].name
,
2895 name
, __FUNCTION__
);
2896 bfd_set_error (bfd_error_bad_value
);
2905 if (ABI_64_P (output_bfd
))
2909 if (rel
->r_addend
!= 0)
2911 if (h
->root
.root
.string
)
2912 name
= h
->root
.root
.string
;
2914 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2916 (*_bfd_error_handler
)
2917 (_("%B: relocation %s against STT_GNU_IFUNC "
2918 "symbol `%s' has non-zero addend: %d"),
2919 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2920 name
, rel
->r_addend
);
2921 bfd_set_error (bfd_error_bad_value
);
2925 /* Generate dynamic relcoation only when there is a
2926 non-GOF reference in a shared object. */
2927 if (info
->shared
&& h
->non_got_ref
)
2929 Elf_Internal_Rela outrel
;
2932 /* Need a dynamic relocation to get the real function
2934 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2938 if (outrel
.r_offset
== (bfd_vma
) -1
2939 || outrel
.r_offset
== (bfd_vma
) -2)
2942 outrel
.r_offset
+= (input_section
->output_section
->vma
2943 + input_section
->output_offset
);
2945 if (h
->dynindx
== -1
2947 || info
->executable
)
2949 /* This symbol is resolved locally. */
2950 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
2951 outrel
.r_addend
= (h
->root
.u
.def
.value
2952 + h
->root
.u
.def
.section
->output_section
->vma
2953 + h
->root
.u
.def
.section
->output_offset
);
2957 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
2958 outrel
.r_addend
= 0;
2961 sreloc
= htab
->elf
.irelifunc
;
2962 elf_append_rela (output_bfd
, sreloc
, &outrel
);
2964 /* If this reloc is against an external symbol, we
2965 do not want to fiddle with the addend. Otherwise,
2966 we need to include the symbol value so that it
2967 becomes an addend for the dynamic reloc. For an
2968 internal symbol, we have updated addend. */
2974 case R_X86_64_PLT32
:
2977 case R_X86_64_GOTPCREL
:
2978 case R_X86_64_GOTPCREL64
:
2979 base_got
= htab
->elf
.sgot
;
2980 off
= h
->got
.offset
;
2982 if (base_got
== NULL
)
2985 if (off
== (bfd_vma
) -1)
2987 /* We can't use h->got.offset here to save state, or
2988 even just remember the offset, as finish_dynamic_symbol
2989 would use that as offset into .got. */
2991 if (htab
->elf
.splt
!= NULL
)
2993 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2994 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2995 base_got
= htab
->elf
.sgotplt
;
2999 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3000 off
= plt_index
* GOT_ENTRY_SIZE
;
3001 base_got
= htab
->elf
.igotplt
;
3004 if (h
->dynindx
== -1
3008 /* This references the local defitionion. We must
3009 initialize this entry in the global offset table.
3010 Since the offset must always be a multiple of 8,
3011 we use the least significant bit to record
3012 whether we have initialized it already.
3014 When doing a dynamic link, we create a .rela.got
3015 relocation entry to initialize the value. This
3016 is done in the finish_dynamic_symbol routine. */
3021 bfd_put_64 (output_bfd
, relocation
,
3022 base_got
->contents
+ off
);
3023 /* Note that this is harmless for the GOTPLT64
3024 case, as -1 | 1 still is -1. */
3030 relocation
= (base_got
->output_section
->vma
3031 + base_got
->output_offset
+ off
);
3037 /* When generating a shared object, the relocations handled here are
3038 copied into the output file to be resolved at run time. */
3041 case R_X86_64_GOT32
:
3042 case R_X86_64_GOT64
:
3043 /* Relocation is to the entry for this symbol in the global
3045 case R_X86_64_GOTPCREL
:
3046 case R_X86_64_GOTPCREL64
:
3047 /* Use global offset table entry as symbol value. */
3048 case R_X86_64_GOTPLT64
:
3049 /* This is the same as GOT64 for relocation purposes, but
3050 indicates the existence of a PLT entry. The difficulty is,
3051 that we must calculate the GOT slot offset from the PLT
3052 offset, if this symbol got a PLT entry (it was global).
3053 Additionally if it's computed from the PLT entry, then that
3054 GOT offset is relative to .got.plt, not to .got. */
3055 base_got
= htab
->elf
.sgot
;
3057 if (htab
->elf
.sgot
== NULL
)
3064 off
= h
->got
.offset
;
3066 && h
->plt
.offset
!= (bfd_vma
)-1
3067 && off
== (bfd_vma
)-1)
3069 /* We can't use h->got.offset here to save
3070 state, or even just remember the offset, as
3071 finish_dynamic_symbol would use that as offset into
3073 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3074 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3075 base_got
= htab
->elf
.sgotplt
;
3078 dyn
= htab
->elf
.dynamic_sections_created
;
3080 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3082 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3083 || (ELF_ST_VISIBILITY (h
->other
)
3084 && h
->root
.type
== bfd_link_hash_undefweak
))
3086 /* This is actually a static link, or it is a -Bsymbolic
3087 link and the symbol is defined locally, or the symbol
3088 was forced to be local because of a version file. We
3089 must initialize this entry in the global offset table.
3090 Since the offset must always be a multiple of 8, we
3091 use the least significant bit to record whether we
3092 have initialized it already.
3094 When doing a dynamic link, we create a .rela.got
3095 relocation entry to initialize the value. This is
3096 done in the finish_dynamic_symbol routine. */
3101 bfd_put_64 (output_bfd
, relocation
,
3102 base_got
->contents
+ off
);
3103 /* Note that this is harmless for the GOTPLT64 case,
3104 as -1 | 1 still is -1. */
3109 unresolved_reloc
= FALSE
;
3113 if (local_got_offsets
== NULL
)
3116 off
= local_got_offsets
[r_symndx
];
3118 /* The offset must always be a multiple of 8. We use
3119 the least significant bit to record whether we have
3120 already generated the necessary reloc. */
3125 bfd_put_64 (output_bfd
, relocation
,
3126 base_got
->contents
+ off
);
3131 Elf_Internal_Rela outrel
;
3133 /* We need to generate a R_X86_64_RELATIVE reloc
3134 for the dynamic linker. */
3135 s
= htab
->elf
.srelgot
;
3139 outrel
.r_offset
= (base_got
->output_section
->vma
3140 + base_got
->output_offset
3142 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3143 outrel
.r_addend
= relocation
;
3144 elf_append_rela (output_bfd
, s
, &outrel
);
3147 local_got_offsets
[r_symndx
] |= 1;
3151 if (off
>= (bfd_vma
) -2)
3154 relocation
= base_got
->output_section
->vma
3155 + base_got
->output_offset
+ off
;
3156 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3157 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3158 - htab
->elf
.sgotplt
->output_offset
;
3162 case R_X86_64_GOTOFF64
:
3163 /* Relocation is relative to the start of the global offset
3166 /* Check to make sure it isn't a protected function symbol
3167 for shared library since it may not be local when used
3168 as function address. */
3172 && h
->type
== STT_FUNC
3173 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3175 (*_bfd_error_handler
)
3176 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3177 input_bfd
, h
->root
.root
.string
);
3178 bfd_set_error (bfd_error_bad_value
);
3182 /* Note that sgot is not involved in this
3183 calculation. We always want the start of .got.plt. If we
3184 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3185 permitted by the ABI, we might have to change this
3187 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3188 + htab
->elf
.sgotplt
->output_offset
;
3191 case R_X86_64_GOTPC32
:
3192 case R_X86_64_GOTPC64
:
3193 /* Use global offset table as symbol value. */
3194 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3195 + htab
->elf
.sgotplt
->output_offset
;
3196 unresolved_reloc
= FALSE
;
3199 case R_X86_64_PLTOFF64
:
3200 /* Relocation is PLT entry relative to GOT. For local
3201 symbols it's the symbol itself relative to GOT. */
3203 /* See PLT32 handling. */
3204 && h
->plt
.offset
!= (bfd_vma
) -1
3205 && htab
->elf
.splt
!= NULL
)
3207 relocation
= (htab
->elf
.splt
->output_section
->vma
3208 + htab
->elf
.splt
->output_offset
3210 unresolved_reloc
= FALSE
;
3213 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3214 + htab
->elf
.sgotplt
->output_offset
;
3217 case R_X86_64_PLT32
:
3218 /* Relocation is to the entry for this symbol in the
3219 procedure linkage table. */
3221 /* Resolve a PLT32 reloc against a local symbol directly,
3222 without using the procedure linkage table. */
3226 if (h
->plt
.offset
== (bfd_vma
) -1
3227 || htab
->elf
.splt
== NULL
)
3229 /* We didn't make a PLT entry for this symbol. This
3230 happens when statically linking PIC code, or when
3231 using -Bsymbolic. */
3235 relocation
= (htab
->elf
.splt
->output_section
->vma
3236 + htab
->elf
.splt
->output_offset
3238 unresolved_reloc
= FALSE
;
3245 && ABI_64_P (output_bfd
)
3246 && (input_section
->flags
& SEC_ALLOC
) != 0
3247 && (input_section
->flags
& SEC_READONLY
) != 0
3250 bfd_boolean fail
= FALSE
;
3252 = (r_type
== R_X86_64_PC32
3253 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3255 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3257 /* Symbol is referenced locally. Make sure it is
3258 defined locally or for a branch. */
3259 fail
= !h
->def_regular
&& !branch
;
3263 /* Symbol isn't referenced locally. We only allow
3264 branch to symbol with non-default visibility. */
3266 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3273 const char *pic
= "";
3275 switch (ELF_ST_VISIBILITY (h
->other
))
3278 v
= _("hidden symbol");
3281 v
= _("internal symbol");
3284 v
= _("protected symbol");
3288 pic
= _("; recompile with -fPIC");
3293 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3295 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3297 (*_bfd_error_handler
) (fmt
, input_bfd
,
3298 x86_64_elf_howto_table
[r_type
].name
,
3299 v
, h
->root
.root
.string
, pic
);
3300 bfd_set_error (bfd_error_bad_value
);
3311 /* FIXME: The ABI says the linker should make sure the value is
3312 the same when it's zeroextended to 64 bit. */
3314 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3319 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3320 || h
->root
.type
!= bfd_link_hash_undefweak
)
3321 && (! IS_X86_64_PCREL_TYPE (r_type
)
3322 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3323 || (ELIMINATE_COPY_RELOCS
3330 || h
->root
.type
== bfd_link_hash_undefweak
3331 || h
->root
.type
== bfd_link_hash_undefined
)))
3333 Elf_Internal_Rela outrel
;
3334 bfd_boolean skip
, relocate
;
3337 /* When generating a shared object, these relocations
3338 are copied into the output file to be resolved at run
3344 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3346 if (outrel
.r_offset
== (bfd_vma
) -1)
3348 else if (outrel
.r_offset
== (bfd_vma
) -2)
3349 skip
= TRUE
, relocate
= TRUE
;
3351 outrel
.r_offset
+= (input_section
->output_section
->vma
3352 + input_section
->output_offset
);
3355 memset (&outrel
, 0, sizeof outrel
);
3357 /* h->dynindx may be -1 if this symbol was marked to
3361 && (IS_X86_64_PCREL_TYPE (r_type
)
3363 || ! SYMBOLIC_BIND (info
, h
)
3364 || ! h
->def_regular
))
3366 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3367 outrel
.r_addend
= rel
->r_addend
;
3371 /* This symbol is local, or marked to become local. */
3372 if (r_type
== htab
->pointer_r_type
)
3375 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3376 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3382 if (bfd_is_abs_section (sec
))
3384 else if (sec
== NULL
|| sec
->owner
== NULL
)
3386 bfd_set_error (bfd_error_bad_value
);
3393 /* We are turning this relocation into one
3394 against a section symbol. It would be
3395 proper to subtract the symbol's value,
3396 osec->vma, from the emitted reloc addend,
3397 but ld.so expects buggy relocs. */
3398 osec
= sec
->output_section
;
3399 sindx
= elf_section_data (osec
)->dynindx
;
3402 asection
*oi
= htab
->elf
.text_index_section
;
3403 sindx
= elf_section_data (oi
)->dynindx
;
3405 BFD_ASSERT (sindx
!= 0);
3408 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3409 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3413 sreloc
= elf_section_data (input_section
)->sreloc
;
3415 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3417 r
= bfd_reloc_notsupported
;
3418 goto check_relocation_error
;
3421 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3423 /* If this reloc is against an external symbol, we do
3424 not want to fiddle with the addend. Otherwise, we
3425 need to include the symbol value so that it becomes
3426 an addend for the dynamic reloc. */
3433 case R_X86_64_TLSGD
:
3434 case R_X86_64_GOTPC32_TLSDESC
:
3435 case R_X86_64_TLSDESC_CALL
:
3436 case R_X86_64_GOTTPOFF
:
3437 tls_type
= GOT_UNKNOWN
;
3438 if (h
== NULL
&& local_got_offsets
)
3439 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3441 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3443 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3444 input_section
, contents
,
3445 symtab_hdr
, sym_hashes
,
3446 &r_type
, tls_type
, rel
,
3447 relend
, h
, r_symndx
))
3450 if (r_type
== R_X86_64_TPOFF32
)
3452 bfd_vma roff
= rel
->r_offset
;
3454 BFD_ASSERT (! unresolved_reloc
);
3456 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3458 /* GD->LE transition. For 64bit, change
3459 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3460 .word 0x6666; rex64; call __tls_get_addr
3463 leaq foo@tpoff(%rax), %rax
3465 leaq foo@tlsgd(%rip), %rdi
3466 .word 0x6666; rex64; call __tls_get_addr
3469 leaq foo@tpoff(%rax), %rax */
3470 if (ABI_64_P (output_bfd
))
3471 memcpy (contents
+ roff
- 4,
3472 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3475 memcpy (contents
+ roff
- 3,
3476 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3478 bfd_put_32 (output_bfd
,
3479 elf_x86_64_tpoff (info
, relocation
),
3480 contents
+ roff
+ 8);
3481 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3485 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3487 /* GDesc -> LE transition.
3488 It's originally something like:
3489 leaq x@tlsdesc(%rip), %rax
3492 movl $x@tpoff, %rax. */
3494 unsigned int val
, type
;
3496 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3497 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3498 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3499 contents
+ roff
- 3);
3500 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3501 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3502 contents
+ roff
- 1);
3503 bfd_put_32 (output_bfd
,
3504 elf_x86_64_tpoff (info
, relocation
),
3508 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3510 /* GDesc -> LE transition.
3515 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3516 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3519 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3521 /* IE->LE transition:
3522 Originally it can be one of:
3523 movq foo@gottpoff(%rip), %reg
3524 addq foo@gottpoff(%rip), %reg
3527 leaq foo(%reg), %reg
3530 unsigned int val
, type
, reg
;
3532 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3533 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3534 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3540 bfd_put_8 (output_bfd
, 0x49,
3541 contents
+ roff
- 3);
3542 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3543 bfd_put_8 (output_bfd
, 0x41,
3544 contents
+ roff
- 3);
3545 bfd_put_8 (output_bfd
, 0xc7,
3546 contents
+ roff
- 2);
3547 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3548 contents
+ roff
- 1);
3552 /* addq -> addq - addressing with %rsp/%r12 is
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
, 0x81,
3561 contents
+ roff
- 2);
3562 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3563 contents
+ roff
- 1);
3569 bfd_put_8 (output_bfd
, 0x4d,
3570 contents
+ roff
- 3);
3571 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3572 bfd_put_8 (output_bfd
, 0x45,
3573 contents
+ roff
- 3);
3574 bfd_put_8 (output_bfd
, 0x8d,
3575 contents
+ roff
- 2);
3576 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3577 contents
+ roff
- 1);
3579 bfd_put_32 (output_bfd
,
3580 elf_x86_64_tpoff (info
, relocation
),
3588 if (htab
->elf
.sgot
== NULL
)
3593 off
= h
->got
.offset
;
3594 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
3598 if (local_got_offsets
== NULL
)
3601 off
= local_got_offsets
[r_symndx
];
3602 offplt
= local_tlsdesc_gotents
[r_symndx
];
3609 Elf_Internal_Rela outrel
;
3613 if (htab
->elf
.srelgot
== NULL
)
3616 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3618 if (GOT_TLS_GDESC_P (tls_type
))
3620 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3621 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3622 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3623 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3624 + htab
->elf
.sgotplt
->output_offset
3626 + htab
->sgotplt_jump_table_size
);
3627 sreloc
= htab
->elf
.srelplt
;
3629 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3631 outrel
.r_addend
= 0;
3632 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3635 sreloc
= htab
->elf
.srelgot
;
3637 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3638 + htab
->elf
.sgot
->output_offset
+ off
);
3640 if (GOT_TLS_GD_P (tls_type
))
3641 dr_type
= R_X86_64_DTPMOD64
;
3642 else if (GOT_TLS_GDESC_P (tls_type
))
3645 dr_type
= R_X86_64_TPOFF64
;
3647 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3648 outrel
.r_addend
= 0;
3649 if ((dr_type
== R_X86_64_TPOFF64
3650 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3651 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3652 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
3654 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3656 if (GOT_TLS_GD_P (tls_type
))
3660 BFD_ASSERT (! unresolved_reloc
);
3661 bfd_put_64 (output_bfd
,
3662 relocation
- elf_x86_64_dtpoff_base (info
),
3663 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3667 bfd_put_64 (output_bfd
, 0,
3668 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3669 outrel
.r_info
= htab
->r_info (indx
,
3671 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3672 elf_append_rela (output_bfd
, sreloc
,
3681 local_got_offsets
[r_symndx
] |= 1;
3684 if (off
>= (bfd_vma
) -2
3685 && ! GOT_TLS_GDESC_P (tls_type
))
3687 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
3689 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3690 || r_type
== R_X86_64_TLSDESC_CALL
)
3691 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3692 + htab
->elf
.sgotplt
->output_offset
3693 + offplt
+ htab
->sgotplt_jump_table_size
;
3695 relocation
= htab
->elf
.sgot
->output_section
->vma
3696 + htab
->elf
.sgot
->output_offset
+ off
;
3697 unresolved_reloc
= FALSE
;
3701 bfd_vma roff
= rel
->r_offset
;
3703 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3705 /* GD->IE transition. For 64bit, change
3706 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3707 .word 0x6666; rex64; call __tls_get_addr@plt
3710 addq foo@gottpoff(%rip), %rax
3712 leaq foo@tlsgd(%rip), %rdi
3713 .word 0x6666; rex64; call __tls_get_addr@plt
3716 addq foo@gottpoff(%rip), %rax */
3717 if (ABI_64_P (output_bfd
))
3718 memcpy (contents
+ roff
- 4,
3719 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3722 memcpy (contents
+ roff
- 3,
3723 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3726 relocation
= (htab
->elf
.sgot
->output_section
->vma
3727 + htab
->elf
.sgot
->output_offset
+ off
3729 - input_section
->output_section
->vma
3730 - input_section
->output_offset
3732 bfd_put_32 (output_bfd
, relocation
,
3733 contents
+ roff
+ 8);
3734 /* Skip R_X86_64_PLT32. */
3738 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3740 /* GDesc -> IE transition.
3741 It's originally something like:
3742 leaq x@tlsdesc(%rip), %rax
3745 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3747 /* Now modify the instruction as appropriate. To
3748 turn a leaq into a movq in the form we use it, it
3749 suffices to change the second byte from 0x8d to
3751 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3753 bfd_put_32 (output_bfd
,
3754 htab
->elf
.sgot
->output_section
->vma
3755 + htab
->elf
.sgot
->output_offset
+ off
3757 - input_section
->output_section
->vma
3758 - input_section
->output_offset
3763 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3765 /* GDesc -> IE transition.
3772 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3773 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3781 case R_X86_64_TLSLD
:
3782 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3783 input_section
, contents
,
3784 symtab_hdr
, sym_hashes
,
3785 &r_type
, GOT_UNKNOWN
,
3786 rel
, relend
, h
, r_symndx
))
3789 if (r_type
!= R_X86_64_TLSLD
)
3791 /* LD->LE transition:
3792 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3793 For 64bit, we change it into:
3794 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
3795 For 32bit, we change it into:
3796 nopl 0x0(%rax); movl %fs:0, %eax. */
3798 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3799 if (ABI_64_P (output_bfd
))
3800 memcpy (contents
+ rel
->r_offset
- 3,
3801 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3803 memcpy (contents
+ rel
->r_offset
- 3,
3804 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
3805 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3810 if (htab
->elf
.sgot
== NULL
)
3813 off
= htab
->tls_ld_got
.offset
;
3818 Elf_Internal_Rela outrel
;
3820 if (htab
->elf
.srelgot
== NULL
)
3823 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3824 + htab
->elf
.sgot
->output_offset
+ off
);
3826 bfd_put_64 (output_bfd
, 0,
3827 htab
->elf
.sgot
->contents
+ off
);
3828 bfd_put_64 (output_bfd
, 0,
3829 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3830 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
3831 outrel
.r_addend
= 0;
3832 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
3834 htab
->tls_ld_got
.offset
|= 1;
3836 relocation
= htab
->elf
.sgot
->output_section
->vma
3837 + htab
->elf
.sgot
->output_offset
+ off
;
3838 unresolved_reloc
= FALSE
;
3841 case R_X86_64_DTPOFF32
:
3842 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
3843 relocation
-= elf_x86_64_dtpoff_base (info
);
3845 relocation
= elf_x86_64_tpoff (info
, relocation
);
3848 case R_X86_64_TPOFF32
:
3849 BFD_ASSERT (info
->executable
);
3850 relocation
= elf_x86_64_tpoff (info
, relocation
);
3857 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3858 because such sections are not SEC_ALLOC and thus ld.so will
3859 not process them. */
3860 if (unresolved_reloc
3861 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3863 (*_bfd_error_handler
)
3864 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3867 (long) rel
->r_offset
,
3869 h
->root
.root
.string
);
3872 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3873 contents
, rel
->r_offset
,
3874 relocation
, rel
->r_addend
);
3876 check_relocation_error
:
3877 if (r
!= bfd_reloc_ok
)
3882 name
= h
->root
.root
.string
;
3885 name
= bfd_elf_string_from_elf_section (input_bfd
,
3886 symtab_hdr
->sh_link
,
3891 name
= bfd_section_name (input_bfd
, sec
);
3894 if (r
== bfd_reloc_overflow
)
3896 if (! ((*info
->callbacks
->reloc_overflow
)
3897 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3898 (bfd_vma
) 0, input_bfd
, input_section
,
3904 (*_bfd_error_handler
)
3905 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3906 input_bfd
, input_section
,
3907 (long) rel
->r_offset
, name
, (int) r
);
3916 /* Finish up dynamic symbol handling. We set the contents of various
3917 dynamic sections here. */
3920 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3921 struct bfd_link_info
*info
,
3922 struct elf_link_hash_entry
*h
,
3923 Elf_Internal_Sym
*sym
)
3925 struct elf_x86_64_link_hash_table
*htab
;
3927 htab
= elf_x86_64_hash_table (info
);
3931 if (h
->plt
.offset
!= (bfd_vma
) -1)
3935 Elf_Internal_Rela rela
;
3937 asection
*plt
, *gotplt
, *relplt
;
3938 const struct elf_backend_data
*bed
;
3940 /* When building a static executable, use .iplt, .igot.plt and
3941 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3942 if (htab
->elf
.splt
!= NULL
)
3944 plt
= htab
->elf
.splt
;
3945 gotplt
= htab
->elf
.sgotplt
;
3946 relplt
= htab
->elf
.srelplt
;
3950 plt
= htab
->elf
.iplt
;
3951 gotplt
= htab
->elf
.igotplt
;
3952 relplt
= htab
->elf
.irelplt
;
3955 /* This symbol has an entry in the procedure linkage table. Set
3957 if ((h
->dynindx
== -1
3958 && !((h
->forced_local
|| info
->executable
)
3960 && h
->type
== STT_GNU_IFUNC
))
3966 /* Get the index in the procedure linkage table which
3967 corresponds to this symbol. This is the index of this symbol
3968 in all the symbols for which we are making plt entries. The
3969 first entry in the procedure linkage table is reserved.
3971 Get the offset into the .got table of the entry that
3972 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3973 bytes. The first three are reserved for the dynamic linker.
3975 For static executables, we don't reserve anything. */
3977 if (plt
== htab
->elf
.splt
)
3979 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3980 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3984 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3985 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
3988 /* Fill in the entry in the procedure linkage table. */
3989 memcpy (plt
->contents
+ h
->plt
.offset
, elf_x86_64_plt_entry
,
3992 /* Insert the relocation positions of the plt section. The magic
3993 numbers at the end of the statements are the positions of the
3994 relocations in the plt section. */
3995 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3996 instruction uses 6 bytes, subtract this value. */
3997 bfd_put_32 (output_bfd
,
3998 (gotplt
->output_section
->vma
3999 + gotplt
->output_offset
4001 - plt
->output_section
->vma
4002 - plt
->output_offset
4005 plt
->contents
+ h
->plt
.offset
+ 2);
4007 /* Don't fill PLT entry for static executables. */
4008 if (plt
== htab
->elf
.splt
)
4010 /* Put relocation index. */
4011 bfd_put_32 (output_bfd
, plt_index
,
4012 plt
->contents
+ h
->plt
.offset
+ 7);
4013 /* Put offset for jmp .PLT0. */
4014 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
4015 plt
->contents
+ h
->plt
.offset
+ 12);
4018 /* Fill in the entry in the global offset table, initially this
4019 points to the pushq instruction in the PLT which is at offset 6. */
4020 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4021 + plt
->output_offset
4022 + h
->plt
.offset
+ 6),
4023 gotplt
->contents
+ got_offset
);
4025 /* Fill in the entry in the .rela.plt section. */
4026 rela
.r_offset
= (gotplt
->output_section
->vma
4027 + gotplt
->output_offset
4029 if (h
->dynindx
== -1
4030 || ((info
->executable
4031 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4033 && h
->type
== STT_GNU_IFUNC
))
4035 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4036 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4037 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4038 rela
.r_addend
= (h
->root
.u
.def
.value
4039 + h
->root
.u
.def
.section
->output_section
->vma
4040 + h
->root
.u
.def
.section
->output_offset
);
4044 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4048 bed
= get_elf_backend_data (output_bfd
);
4049 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4050 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4052 if (!h
->def_regular
)
4054 /* Mark the symbol as undefined, rather than as defined in
4055 the .plt section. Leave the value if there were any
4056 relocations where pointer equality matters (this is a clue
4057 for the dynamic linker, to make function pointer
4058 comparisons work between an application and shared
4059 library), otherwise set it to zero. If a function is only
4060 called from a binary, there is no need to slow down
4061 shared libraries because of that. */
4062 sym
->st_shndx
= SHN_UNDEF
;
4063 if (!h
->pointer_equality_needed
)
4068 if (h
->got
.offset
!= (bfd_vma
) -1
4069 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
4070 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4072 Elf_Internal_Rela rela
;
4074 /* This symbol has an entry in the global offset table. Set it
4076 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4079 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4080 + htab
->elf
.sgot
->output_offset
4081 + (h
->got
.offset
&~ (bfd_vma
) 1));
4083 /* If this is a static link, or it is a -Bsymbolic link and the
4084 symbol is defined locally or was forced to be local because
4085 of a version file, we just want to emit a RELATIVE reloc.
4086 The entry in the global offset table will already have been
4087 initialized in the relocate_section function. */
4089 && h
->type
== STT_GNU_IFUNC
)
4093 /* Generate R_X86_64_GLOB_DAT. */
4100 if (!h
->pointer_equality_needed
)
4103 /* For non-shared object, we can't use .got.plt, which
4104 contains the real function addres if we need pointer
4105 equality. We load the GOT entry with the PLT entry. */
4106 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4107 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4108 + plt
->output_offset
4110 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4114 else if (info
->shared
4115 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4117 if (!h
->def_regular
)
4119 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4120 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4121 rela
.r_addend
= (h
->root
.u
.def
.value
4122 + h
->root
.u
.def
.section
->output_section
->vma
4123 + h
->root
.u
.def
.section
->output_offset
);
4127 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4129 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4130 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4131 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4135 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
4140 Elf_Internal_Rela rela
;
4142 /* This symbol needs a copy reloc. Set it up. */
4144 if (h
->dynindx
== -1
4145 || (h
->root
.type
!= bfd_link_hash_defined
4146 && h
->root
.type
!= bfd_link_hash_defweak
)
4147 || htab
->srelbss
== NULL
)
4150 rela
.r_offset
= (h
->root
.u
.def
.value
4151 + h
->root
.u
.def
.section
->output_section
->vma
4152 + h
->root
.u
.def
.section
->output_offset
);
4153 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4155 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
4158 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4159 be NULL for local symbols. */
4161 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4162 || h
== htab
->elf
.hgot
))
4163 sym
->st_shndx
= SHN_ABS
;
4168 /* Finish up local dynamic symbol handling. We set the contents of
4169 various dynamic sections here. */
4172 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4174 struct elf_link_hash_entry
*h
4175 = (struct elf_link_hash_entry
*) *slot
;
4176 struct bfd_link_info
*info
4177 = (struct bfd_link_info
*) inf
;
4179 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4183 /* Used to decide how to sort relocs in an optimal manner for the
4184 dynamic linker, before writing them out. */
4186 static enum elf_reloc_type_class
4187 elf_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4189 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4191 case R_X86_64_RELATIVE
:
4192 return reloc_class_relative
;
4193 case R_X86_64_JUMP_SLOT
:
4194 return reloc_class_plt
;
4196 return reloc_class_copy
;
4198 return reloc_class_normal
;
4202 /* Finish up the dynamic sections. */
4205 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4206 struct bfd_link_info
*info
)
4208 struct elf_x86_64_link_hash_table
*htab
;
4212 htab
= elf_x86_64_hash_table (info
);
4216 dynobj
= htab
->elf
.dynobj
;
4217 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4219 if (htab
->elf
.dynamic_sections_created
)
4221 bfd_byte
*dyncon
, *dynconend
;
4222 const struct elf_backend_data
*bed
;
4223 bfd_size_type sizeof_dyn
;
4225 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4228 bed
= get_elf_backend_data (dynobj
);
4229 sizeof_dyn
= bed
->s
->sizeof_dyn
;
4230 dyncon
= sdyn
->contents
;
4231 dynconend
= sdyn
->contents
+ sdyn
->size
;
4232 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
4234 Elf_Internal_Dyn dyn
;
4237 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
4245 s
= htab
->elf
.sgotplt
;
4246 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4250 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4254 s
= htab
->elf
.srelplt
->output_section
;
4255 dyn
.d_un
.d_val
= s
->size
;
4259 /* The procedure linkage table relocs (DT_JMPREL) should
4260 not be included in the overall relocs (DT_RELA).
4261 Therefore, we override the DT_RELASZ entry here to
4262 make it not include the JMPREL relocs. Since the
4263 linker script arranges for .rela.plt to follow all
4264 other relocation sections, we don't have to worry
4265 about changing the DT_RELA entry. */
4266 if (htab
->elf
.srelplt
!= NULL
)
4268 s
= htab
->elf
.srelplt
->output_section
;
4269 dyn
.d_un
.d_val
-= s
->size
;
4273 case DT_TLSDESC_PLT
:
4275 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4276 + htab
->tlsdesc_plt
;
4279 case DT_TLSDESC_GOT
:
4281 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4282 + htab
->tlsdesc_got
;
4286 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
4289 /* Fill in the special first entry in the procedure linkage table. */
4290 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4292 /* Fill in the first entry in the procedure linkage table. */
4293 memcpy (htab
->elf
.splt
->contents
, elf_x86_64_plt0_entry
,
4295 /* Add offset for pushq GOT+8(%rip), since the instruction
4296 uses 6 bytes subtract this value. */
4297 bfd_put_32 (output_bfd
,
4298 (htab
->elf
.sgotplt
->output_section
->vma
4299 + htab
->elf
.sgotplt
->output_offset
4301 - htab
->elf
.splt
->output_section
->vma
4302 - htab
->elf
.splt
->output_offset
4304 htab
->elf
.splt
->contents
+ 2);
4305 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4306 the end of the instruction. */
4307 bfd_put_32 (output_bfd
,
4308 (htab
->elf
.sgotplt
->output_section
->vma
4309 + htab
->elf
.sgotplt
->output_offset
4311 - htab
->elf
.splt
->output_section
->vma
4312 - htab
->elf
.splt
->output_offset
4314 htab
->elf
.splt
->contents
+ 8);
4316 elf_section_data (htab
->elf
.splt
->output_section
)->this_hdr
.sh_entsize
=
4319 if (htab
->tlsdesc_plt
)
4321 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4322 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4324 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4325 elf_x86_64_plt0_entry
,
4328 /* Add offset for pushq GOT+8(%rip), since the
4329 instruction uses 6 bytes subtract this value. */
4330 bfd_put_32 (output_bfd
,
4331 (htab
->elf
.sgotplt
->output_section
->vma
4332 + htab
->elf
.sgotplt
->output_offset
4334 - htab
->elf
.splt
->output_section
->vma
4335 - htab
->elf
.splt
->output_offset
4338 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4339 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4340 htab->tlsdesc_got. The 12 is the offset to the end of
4342 bfd_put_32 (output_bfd
,
4343 (htab
->elf
.sgot
->output_section
->vma
4344 + htab
->elf
.sgot
->output_offset
4346 - htab
->elf
.splt
->output_section
->vma
4347 - htab
->elf
.splt
->output_offset
4350 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4355 if (htab
->elf
.sgotplt
)
4357 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4359 (*_bfd_error_handler
)
4360 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4364 /* Fill in the first three entries in the global offset table. */
4365 if (htab
->elf
.sgotplt
->size
> 0)
4367 /* Set the first entry in the global offset table to the address of
4368 the dynamic section. */
4370 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4372 bfd_put_64 (output_bfd
,
4373 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4374 htab
->elf
.sgotplt
->contents
);
4375 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4376 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4377 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4380 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4384 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4385 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4388 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4389 htab_traverse (htab
->loc_hash_table
,
4390 elf_x86_64_finish_local_dynamic_symbol
,
4396 /* Return address for Ith PLT stub in section PLT, for relocation REL
4397 or (bfd_vma) -1 if it should not be included. */
4400 elf_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4401 const arelent
*rel ATTRIBUTE_UNUSED
)
4403 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4406 /* Handle an x86-64 specific section when reading an object file. This
4407 is called when elfcode.h finds a section with an unknown type. */
4410 elf_x86_64_section_from_shdr (bfd
*abfd
,
4411 Elf_Internal_Shdr
*hdr
,
4415 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4418 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4424 /* Hook called by the linker routine which adds symbols from an object
4425 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4429 elf_x86_64_add_symbol_hook (bfd
*abfd
,
4430 struct bfd_link_info
*info
,
4431 Elf_Internal_Sym
*sym
,
4432 const char **namep ATTRIBUTE_UNUSED
,
4433 flagword
*flagsp ATTRIBUTE_UNUSED
,
4439 switch (sym
->st_shndx
)
4441 case SHN_X86_64_LCOMMON
:
4442 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4445 lcomm
= bfd_make_section_with_flags (abfd
,
4449 | SEC_LINKER_CREATED
));
4452 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4455 *valp
= sym
->st_size
;
4459 if ((abfd
->flags
& DYNAMIC
) == 0
4460 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4461 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4467 /* Given a BFD section, try to locate the corresponding ELF section
4471 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4472 asection
*sec
, int *index_return
)
4474 if (sec
== &_bfd_elf_large_com_section
)
4476 *index_return
= SHN_X86_64_LCOMMON
;
4482 /* Process a symbol. */
4485 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4488 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4490 switch (elfsym
->internal_elf_sym
.st_shndx
)
4492 case SHN_X86_64_LCOMMON
:
4493 asym
->section
= &_bfd_elf_large_com_section
;
4494 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4495 /* Common symbol doesn't set BSF_GLOBAL. */
4496 asym
->flags
&= ~BSF_GLOBAL
;
4502 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4504 return (sym
->st_shndx
== SHN_COMMON
4505 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4509 elf_x86_64_common_section_index (asection
*sec
)
4511 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4514 return SHN_X86_64_LCOMMON
;
4518 elf_x86_64_common_section (asection
*sec
)
4520 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4521 return bfd_com_section_ptr
;
4523 return &_bfd_elf_large_com_section
;
4527 elf_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4528 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4529 struct elf_link_hash_entry
*h
,
4530 Elf_Internal_Sym
*sym
,
4532 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4533 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4534 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4535 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4536 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4537 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4538 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4539 bfd_boolean
*newdyn
,
4540 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4541 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4542 bfd
*abfd ATTRIBUTE_UNUSED
,
4544 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4545 bfd_boolean
*olddyn
,
4546 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4547 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4551 /* A normal common symbol and a large common symbol result in a
4552 normal common symbol. We turn the large common symbol into a
4555 && h
->root
.type
== bfd_link_hash_common
4557 && bfd_is_com_section (*sec
)
4560 if (sym
->st_shndx
== SHN_COMMON
4561 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4563 h
->root
.u
.c
.p
->section
4564 = bfd_make_section_old_way (oldbfd
, "COMMON");
4565 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4567 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4568 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4569 *psec
= *sec
= bfd_com_section_ptr
;
4576 elf_x86_64_additional_program_headers (bfd
*abfd
,
4577 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4582 /* Check to see if we need a large readonly segment. */
4583 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4584 if (s
&& (s
->flags
& SEC_LOAD
))
4587 /* Check to see if we need a large data segment. Since .lbss sections
4588 is placed right after the .bss section, there should be no need for
4589 a large data segment just because of .lbss. */
4590 s
= bfd_get_section_by_name (abfd
, ".ldata");
4591 if (s
&& (s
->flags
& SEC_LOAD
))
4597 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4600 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4602 if (h
->plt
.offset
!= (bfd_vma
) -1
4604 && !h
->pointer_equality_needed
)
4607 return _bfd_elf_hash_symbol (h
);
4610 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4613 elf_x86_64_relocs_compatible (const bfd_target
*input
,
4614 const bfd_target
*output
)
4616 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
4617 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
4618 && _bfd_elf_relocs_compatible (input
, output
));
4621 static const struct bfd_elf_special_section
4622 elf_x86_64_special_sections
[]=
4624 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4625 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4626 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4627 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4628 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4629 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4630 { NULL
, 0, 0, 0, 0 }
4633 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4634 #define TARGET_LITTLE_NAME "elf64-x86-64"
4635 #define ELF_ARCH bfd_arch_i386
4636 #define ELF_TARGET_ID X86_64_ELF_DATA
4637 #define ELF_MACHINE_CODE EM_X86_64
4638 #define ELF_MAXPAGESIZE 0x200000
4639 #define ELF_MINPAGESIZE 0x1000
4640 #define ELF_COMMONPAGESIZE 0x1000
4642 #define elf_backend_can_gc_sections 1
4643 #define elf_backend_can_refcount 1
4644 #define elf_backend_want_got_plt 1
4645 #define elf_backend_plt_readonly 1
4646 #define elf_backend_want_plt_sym 0
4647 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4648 #define elf_backend_rela_normal 1
4650 #define elf_info_to_howto elf_x86_64_info_to_howto
4652 #define bfd_elf64_bfd_link_hash_table_create \
4653 elf_x86_64_link_hash_table_create
4654 #define bfd_elf64_bfd_link_hash_table_free \
4655 elf_x86_64_link_hash_table_free
4656 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
4657 #define bfd_elf64_bfd_reloc_name_lookup \
4658 elf_x86_64_reloc_name_lookup
4660 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
4661 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
4662 #define elf_backend_check_relocs elf_x86_64_check_relocs
4663 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
4664 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
4665 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
4666 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
4667 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
4668 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
4669 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
4670 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
4671 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
4672 #define elf_backend_relocate_section elf_x86_64_relocate_section
4673 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
4674 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
4675 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4676 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
4677 #define elf_backend_object_p elf64_x86_64_elf_object_p
4678 #define bfd_elf64_mkobject elf_x86_64_mkobject
4680 #define elf_backend_section_from_shdr \
4681 elf_x86_64_section_from_shdr
4683 #define elf_backend_section_from_bfd_section \
4684 elf_x86_64_elf_section_from_bfd_section
4685 #define elf_backend_add_symbol_hook \
4686 elf_x86_64_add_symbol_hook
4687 #define elf_backend_symbol_processing \
4688 elf_x86_64_symbol_processing
4689 #define elf_backend_common_section_index \
4690 elf_x86_64_common_section_index
4691 #define elf_backend_common_section \
4692 elf_x86_64_common_section
4693 #define elf_backend_common_definition \
4694 elf_x86_64_common_definition
4695 #define elf_backend_merge_symbol \
4696 elf_x86_64_merge_symbol
4697 #define elf_backend_special_sections \
4698 elf_x86_64_special_sections
4699 #define elf_backend_additional_program_headers \
4700 elf_x86_64_additional_program_headers
4701 #define elf_backend_hash_symbol \
4702 elf_x86_64_hash_symbol
4704 #undef elf_backend_post_process_headers
4705 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4707 #include "elf64-target.h"
4709 /* FreeBSD support. */
4711 #undef TARGET_LITTLE_SYM
4712 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4713 #undef TARGET_LITTLE_NAME
4714 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4717 #define ELF_OSABI ELFOSABI_FREEBSD
4720 #define elf64_bed elf64_x86_64_fbsd_bed
4722 #include "elf64-target.h"
4724 /* Solaris 2 support. */
4726 #undef TARGET_LITTLE_SYM
4727 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4728 #undef TARGET_LITTLE_NAME
4729 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4731 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4732 objects won't be recognized. */
4736 #define elf64_bed elf64_x86_64_sol2_bed
4738 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
4740 #undef elf_backend_static_tls_alignment
4741 #define elf_backend_static_tls_alignment 16
4743 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4745 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4747 #undef elf_backend_want_plt_sym
4748 #define elf_backend_want_plt_sym 1
4750 #include "elf64-target.h"
4752 /* Intel L1OM support. */
4755 elf64_l1om_elf_object_p (bfd
*abfd
)
4757 /* Set the right machine number for an L1OM elf64 file. */
4758 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
4762 #undef TARGET_LITTLE_SYM
4763 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4764 #undef TARGET_LITTLE_NAME
4765 #define TARGET_LITTLE_NAME "elf64-l1om"
4767 #define ELF_ARCH bfd_arch_l1om
4769 #undef ELF_MACHINE_CODE
4770 #define ELF_MACHINE_CODE EM_L1OM
4775 #define elf64_bed elf64_l1om_bed
4777 #undef elf_backend_object_p
4778 #define elf_backend_object_p elf64_l1om_elf_object_p
4780 #undef elf_backend_post_process_headers
4781 #undef elf_backend_static_tls_alignment
4783 #undef elf_backend_want_plt_sym
4784 #define elf_backend_want_plt_sym 0
4786 #include "elf64-target.h"
4788 /* FreeBSD L1OM support. */
4790 #undef TARGET_LITTLE_SYM
4791 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4792 #undef TARGET_LITTLE_NAME
4793 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4796 #define ELF_OSABI ELFOSABI_FREEBSD
4799 #define elf64_bed elf64_l1om_fbsd_bed
4801 #undef elf_backend_post_process_headers
4802 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4804 #include "elf64-target.h"
4806 /* 32bit x86-64 support. */
4809 elf32_x86_64_elf_object_p (bfd
*abfd
)
4811 /* Set the right machine number for an x86-64 elf32 file. */
4812 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
4816 #undef TARGET_LITTLE_SYM
4817 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
4818 #undef TARGET_LITTLE_NAME
4819 #define TARGET_LITTLE_NAME "elf32-x86-64"
4822 #define ELF_ARCH bfd_arch_i386
4824 #undef ELF_MACHINE_CODE
4825 #define ELF_MACHINE_CODE EM_X86_64
4827 #define bfd_elf32_bfd_link_hash_table_create \
4828 elf_x86_64_link_hash_table_create
4829 #define bfd_elf32_bfd_link_hash_table_free \
4830 elf_x86_64_link_hash_table_free
4831 #define bfd_elf32_bfd_reloc_type_lookup \
4832 elf_x86_64_reloc_type_lookup
4833 #define bfd_elf32_bfd_reloc_name_lookup \
4834 elf_x86_64_reloc_name_lookup
4835 #define bfd_elf32_mkobject \
4840 #undef elf_backend_post_process_headers
4842 #undef elf_backend_object_p
4843 #define elf_backend_object_p \
4844 elf32_x86_64_elf_object_p
4846 #undef elf_backend_bfd_from_remote_memory
4847 #define elf_backend_bfd_from_remote_memory \
4848 _bfd_elf32_bfd_from_remote_memory
4850 #undef elf_backend_size_info
4851 #define elf_backend_size_info \
4852 _bfd_elf32_size_info
4854 #include "elf32-target.h"