1 /* X86-64 specific support for ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 Free Software Foundation, Inc.
4 Contributed by Jan Hubicka <jh@suse.cz>.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "elf/x86-64.h"
34 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
35 #define MINUS_ONE (~ (bfd_vma) 0)
37 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
38 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
39 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
40 since they are the same. */
42 #define ABI_64_P(abfd) \
43 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
45 /* The relocation "howto" table. Order of fields:
46 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
47 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
48 static reloc_howto_type x86_64_elf_howto_table
[] =
50 HOWTO(R_X86_64_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
51 bfd_elf_generic_reloc
, "R_X86_64_NONE", FALSE
, 0x00000000, 0x00000000,
53 HOWTO(R_X86_64_64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
54 bfd_elf_generic_reloc
, "R_X86_64_64", FALSE
, MINUS_ONE
, MINUS_ONE
,
56 HOWTO(R_X86_64_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
57 bfd_elf_generic_reloc
, "R_X86_64_PC32", FALSE
, 0xffffffff, 0xffffffff,
59 HOWTO(R_X86_64_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
60 bfd_elf_generic_reloc
, "R_X86_64_GOT32", FALSE
, 0xffffffff, 0xffffffff,
62 HOWTO(R_X86_64_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
63 bfd_elf_generic_reloc
, "R_X86_64_PLT32", FALSE
, 0xffffffff, 0xffffffff,
65 HOWTO(R_X86_64_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
66 bfd_elf_generic_reloc
, "R_X86_64_COPY", FALSE
, 0xffffffff, 0xffffffff,
68 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
69 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", FALSE
, MINUS_ONE
,
71 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
72 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", FALSE
, MINUS_ONE
,
74 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
75 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", FALSE
, MINUS_ONE
,
77 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
78 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", FALSE
, 0xffffffff,
80 HOWTO(R_X86_64_32
, 0, 2, 32, FALSE
, 0, complain_overflow_unsigned
,
81 bfd_elf_generic_reloc
, "R_X86_64_32", FALSE
, 0xffffffff, 0xffffffff,
83 HOWTO(R_X86_64_32S
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
84 bfd_elf_generic_reloc
, "R_X86_64_32S", FALSE
, 0xffffffff, 0xffffffff,
86 HOWTO(R_X86_64_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
87 bfd_elf_generic_reloc
, "R_X86_64_16", FALSE
, 0xffff, 0xffff, FALSE
),
88 HOWTO(R_X86_64_PC16
,0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
89 bfd_elf_generic_reloc
, "R_X86_64_PC16", FALSE
, 0xffff, 0xffff, TRUE
),
90 HOWTO(R_X86_64_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
91 bfd_elf_generic_reloc
, "R_X86_64_8", FALSE
, 0xff, 0xff, FALSE
),
92 HOWTO(R_X86_64_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
93 bfd_elf_generic_reloc
, "R_X86_64_PC8", FALSE
, 0xff, 0xff, TRUE
),
94 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", FALSE
, MINUS_ONE
,
97 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", FALSE
, MINUS_ONE
,
100 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
101 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", FALSE
, MINUS_ONE
,
103 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
104 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", FALSE
, 0xffffffff,
106 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
107 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", FALSE
, 0xffffffff,
109 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
110 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", FALSE
, 0xffffffff,
112 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
113 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", FALSE
, 0xffffffff,
115 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
116 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", FALSE
, 0xffffffff,
118 HOWTO(R_X86_64_PC64
, 0, 4, 64, TRUE
, 0, complain_overflow_bitfield
,
119 bfd_elf_generic_reloc
, "R_X86_64_PC64", FALSE
, MINUS_ONE
, MINUS_ONE
,
121 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
122 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64",
123 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
124 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, TRUE
, 0, complain_overflow_signed
,
125 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32",
126 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
127 HOWTO(R_X86_64_GOT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
128 bfd_elf_generic_reloc
, "R_X86_64_GOT64", FALSE
, MINUS_ONE
, MINUS_ONE
,
130 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
131 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", FALSE
, MINUS_ONE
,
133 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, TRUE
, 0, complain_overflow_signed
,
134 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64",
135 FALSE
, MINUS_ONE
, MINUS_ONE
, TRUE
),
136 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
137 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", FALSE
, MINUS_ONE
,
139 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, FALSE
, 0, complain_overflow_signed
,
140 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", FALSE
, MINUS_ONE
,
144 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, TRUE
, 0,
145 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
146 "R_X86_64_GOTPC32_TLSDESC",
147 FALSE
, 0xffffffff, 0xffffffff, TRUE
),
148 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 0, 0, FALSE
, 0,
149 complain_overflow_dont
, bfd_elf_generic_reloc
,
150 "R_X86_64_TLSDESC_CALL",
152 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, FALSE
, 0,
153 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
155 FALSE
, MINUS_ONE
, MINUS_ONE
, FALSE
),
156 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, FALSE
, 0, complain_overflow_bitfield
,
157 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", FALSE
, MINUS_ONE
,
160 /* We have a gap in the reloc numbers here.
161 R_X86_64_standard counts the number up to this point, and
162 R_X86_64_vt_offset is the value to subtract from a reloc type of
163 R_X86_64_GNU_VT* to form an index into this table. */
164 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
165 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
167 /* GNU extension to record C++ vtable hierarchy. */
168 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
169 NULL
, "R_X86_64_GNU_VTINHERIT", FALSE
, 0, 0, FALSE
),
171 /* GNU extension to record C++ vtable member usage. */
172 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, FALSE
, 0, complain_overflow_dont
,
173 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", FALSE
, 0, 0,
177 #define IS_X86_64_PCREL_TYPE(TYPE) \
178 ( ((TYPE) == R_X86_64_PC8) \
179 || ((TYPE) == R_X86_64_PC16) \
180 || ((TYPE) == R_X86_64_PC32) \
181 || ((TYPE) == R_X86_64_PC64))
183 /* Map BFD relocs to the x86_64 elf relocs. */
186 bfd_reloc_code_real_type bfd_reloc_val
;
187 unsigned char elf_reloc_val
;
190 static const struct elf_reloc_map x86_64_reloc_map
[] =
192 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
193 { BFD_RELOC_64
, R_X86_64_64
, },
194 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
195 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
196 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
197 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
198 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
199 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
200 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
201 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
202 { BFD_RELOC_32
, R_X86_64_32
, },
203 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
204 { BFD_RELOC_16
, R_X86_64_16
, },
205 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
206 { BFD_RELOC_8
, R_X86_64_8
, },
207 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
208 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
209 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
210 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
211 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
212 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
213 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
214 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
215 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
216 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
217 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
218 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
219 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
220 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
221 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
222 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
223 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
224 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
225 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
226 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
227 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
228 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
229 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
232 static reloc_howto_type
*
233 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
237 if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
238 || r_type
>= (unsigned int) R_X86_64_max
)
240 if (r_type
>= (unsigned int) R_X86_64_standard
)
242 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
244 r_type
= R_X86_64_NONE
;
249 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
250 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
251 return &x86_64_elf_howto_table
[i
];
254 /* Given a BFD reloc type, return a HOWTO structure. */
255 static reloc_howto_type
*
256 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
257 bfd_reloc_code_real_type code
)
261 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
264 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
265 return elf_x86_64_rtype_to_howto (abfd
,
266 x86_64_reloc_map
[i
].elf_reloc_val
);
271 static reloc_howto_type
*
272 elf_x86_64_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
278 i
< (sizeof (x86_64_elf_howto_table
)
279 / sizeof (x86_64_elf_howto_table
[0]));
281 if (x86_64_elf_howto_table
[i
].name
!= NULL
282 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
283 return &x86_64_elf_howto_table
[i
];
288 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
291 elf_x86_64_info_to_howto (bfd
*abfd ATTRIBUTE_UNUSED
, arelent
*cache_ptr
,
292 Elf_Internal_Rela
*dst
)
296 r_type
= ELF32_R_TYPE (dst
->r_info
);
297 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
298 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
);
301 /* Support for core dump NOTE sections. */
303 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
308 switch (note
->descsz
)
313 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
315 elf_tdata (abfd
)->core_signal
316 = bfd_get_16 (abfd
, note
->descdata
+ 12);
319 elf_tdata (abfd
)->core_lwpid
320 = bfd_get_32 (abfd
, note
->descdata
+ 32);
329 /* Make a ".reg/999" section. */
330 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
331 size
, note
->descpos
+ offset
);
335 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
337 switch (note
->descsz
)
342 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
343 elf_tdata (abfd
)->core_pid
344 = bfd_get_32 (abfd
, note
->descdata
+ 24);
345 elf_tdata (abfd
)->core_program
346 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
347 elf_tdata (abfd
)->core_command
348 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
351 /* Note that for some reason, a spurious space is tacked
352 onto the end of the args in some (at least one anyway)
353 implementations, so strip it off if it exists. */
356 char *command
= elf_tdata (abfd
)->core_command
;
357 int n
= strlen (command
);
359 if (0 < n
&& command
[n
- 1] == ' ')
360 command
[n
- 1] = '\0';
366 /* Functions for the x86-64 ELF linker. */
368 /* The name of the dynamic interpreter. This is put in the .interp
371 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
372 #define ELF32_DYNAMIC_INTERPRETER "/lib/ld32.so.1"
374 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
375 copying dynamic variables from a shared lib into an app's dynbss
376 section, and instead use a dynamic relocation to point into the
378 #define ELIMINATE_COPY_RELOCS 1
380 /* The size in bytes of an entry in the global offset table. */
382 #define GOT_ENTRY_SIZE 8
384 /* The size in bytes of an entry in the procedure linkage table. */
386 #define PLT_ENTRY_SIZE 16
388 /* The first entry in a procedure linkage table looks like this. See the
389 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
391 static const bfd_byte elf_x86_64_plt0_entry
[PLT_ENTRY_SIZE
] =
393 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
394 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
395 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
398 /* Subsequent entries in a procedure linkage table look like this. */
400 static const bfd_byte elf_x86_64_plt_entry
[PLT_ENTRY_SIZE
] =
402 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
403 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
404 0x68, /* pushq immediate */
405 0, 0, 0, 0, /* replaced with index into relocation table. */
406 0xe9, /* jmp relative */
407 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
410 /* x86-64 ELF linker hash entry. */
412 struct elf_x86_64_link_hash_entry
414 struct elf_link_hash_entry elf
;
416 /* Track dynamic relocs copied for this symbol. */
417 struct elf_dyn_relocs
*dyn_relocs
;
419 #define GOT_UNKNOWN 0
423 #define GOT_TLS_GDESC 4
424 #define GOT_TLS_GD_BOTH_P(type) \
425 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
426 #define GOT_TLS_GD_P(type) \
427 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
428 #define GOT_TLS_GDESC_P(type) \
429 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
430 #define GOT_TLS_GD_ANY_P(type) \
431 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
432 unsigned char tls_type
;
434 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
435 starting at the end of the jump table. */
439 #define elf_x86_64_hash_entry(ent) \
440 ((struct elf_x86_64_link_hash_entry *)(ent))
442 struct elf_x86_64_obj_tdata
444 struct elf_obj_tdata root
;
446 /* tls_type for each local got entry. */
447 char *local_got_tls_type
;
449 /* GOTPLT entries for TLS descriptors. */
450 bfd_vma
*local_tlsdesc_gotent
;
453 #define elf_x86_64_tdata(abfd) \
454 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
456 #define elf_x86_64_local_got_tls_type(abfd) \
457 (elf_x86_64_tdata (abfd)->local_got_tls_type)
459 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
460 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
462 #define is_x86_64_elf(bfd) \
463 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
464 && elf_tdata (bfd) != NULL \
465 && elf_object_id (bfd) == X86_64_ELF_DATA)
468 elf_x86_64_mkobject (bfd
*abfd
)
470 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_x86_64_obj_tdata
),
474 /* x86-64 ELF linker hash table. */
476 struct elf_x86_64_link_hash_table
478 struct elf_link_hash_table elf
;
480 /* Short-cuts to get to dynamic linker sections. */
486 bfd_signed_vma refcount
;
490 /* The amount of space used by the jump slots in the GOT. */
491 bfd_vma sgotplt_jump_table_size
;
493 /* Small local sym cache. */
494 struct sym_cache sym_cache
;
496 bfd_vma (*r_info
) (bfd_vma
, bfd_vma
);
497 bfd_vma (*r_sym
) (bfd_vma
);
498 unsigned int pointer_r_type
;
499 const char *dynamic_interpreter
;
500 int dynamic_interpreter_size
;
502 /* _TLS_MODULE_BASE_ symbol. */
503 struct bfd_link_hash_entry
*tls_module_base
;
505 /* Used by local STT_GNU_IFUNC symbols. */
506 htab_t loc_hash_table
;
507 void * loc_hash_memory
;
509 /* The offset into splt of the PLT entry for the TLS descriptor
510 resolver. Special values are 0, if not necessary (or not found
511 to be necessary yet), and -1 if needed but not determined
514 /* The offset into sgot of the GOT entry used by the PLT entry
519 /* Get the x86-64 ELF linker hash table from a link_info structure. */
521 #define elf_x86_64_hash_table(p) \
522 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
523 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
525 #define elf_x86_64_compute_jump_table_size(htab) \
526 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
528 /* Create an entry in an x86-64 ELF linker hash table. */
530 static struct bfd_hash_entry
*
531 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry
*entry
,
532 struct bfd_hash_table
*table
,
535 /* Allocate the structure if it has not already been allocated by a
539 entry
= (struct bfd_hash_entry
*)
540 bfd_hash_allocate (table
,
541 sizeof (struct elf_x86_64_link_hash_entry
));
546 /* Call the allocation method of the superclass. */
547 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
550 struct elf_x86_64_link_hash_entry
*eh
;
552 eh
= (struct elf_x86_64_link_hash_entry
*) entry
;
553 eh
->dyn_relocs
= NULL
;
554 eh
->tls_type
= GOT_UNKNOWN
;
555 eh
->tlsdesc_got
= (bfd_vma
) -1;
561 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
562 for local symbol so that we can handle local STT_GNU_IFUNC symbols
563 as global symbol. We reuse indx and dynstr_index for local symbol
564 hash since they aren't used by global symbols in this backend. */
567 elf_x86_64_local_htab_hash (const void *ptr
)
569 struct elf_link_hash_entry
*h
570 = (struct elf_link_hash_entry
*) ptr
;
571 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
574 /* Compare local hash entries. */
577 elf_x86_64_local_htab_eq (const void *ptr1
, const void *ptr2
)
579 struct elf_link_hash_entry
*h1
580 = (struct elf_link_hash_entry
*) ptr1
;
581 struct elf_link_hash_entry
*h2
582 = (struct elf_link_hash_entry
*) ptr2
;
584 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
587 /* Find and/or create a hash entry for local symbol. */
589 static struct elf_link_hash_entry
*
590 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table
*htab
,
591 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
594 struct elf_x86_64_link_hash_entry e
, *ret
;
595 asection
*sec
= abfd
->sections
;
596 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
597 htab
->r_sym (rel
->r_info
));
600 e
.elf
.indx
= sec
->id
;
601 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
602 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
603 create
? INSERT
: NO_INSERT
);
610 ret
= (struct elf_x86_64_link_hash_entry
*) *slot
;
614 ret
= (struct elf_x86_64_link_hash_entry
*)
615 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
616 sizeof (struct elf_x86_64_link_hash_entry
));
619 memset (ret
, 0, sizeof (*ret
));
620 ret
->elf
.indx
= sec
->id
;
621 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
622 ret
->elf
.dynindx
= -1;
628 /* Create an X86-64 ELF linker hash table. */
630 static struct bfd_link_hash_table
*
631 elf_x86_64_link_hash_table_create (bfd
*abfd
)
633 struct elf_x86_64_link_hash_table
*ret
;
634 bfd_size_type amt
= sizeof (struct elf_x86_64_link_hash_table
);
636 ret
= (struct elf_x86_64_link_hash_table
*) bfd_malloc (amt
);
640 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
641 elf_x86_64_link_hash_newfunc
,
642 sizeof (struct elf_x86_64_link_hash_entry
),
651 ret
->sym_cache
.abfd
= NULL
;
652 ret
->tlsdesc_plt
= 0;
653 ret
->tlsdesc_got
= 0;
654 ret
->tls_ld_got
.refcount
= 0;
655 ret
->sgotplt_jump_table_size
= 0;
656 ret
->tls_module_base
= NULL
;
660 ret
->r_info
= elf64_r_info
;
661 ret
->r_sym
= elf64_r_sym
;
662 ret
->pointer_r_type
= R_X86_64_64
;
663 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
664 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
668 ret
->r_info
= elf32_r_info
;
669 ret
->r_sym
= elf32_r_sym
;
670 ret
->pointer_r_type
= R_X86_64_32
;
671 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
672 ret
->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER
;
675 ret
->loc_hash_table
= htab_try_create (1024,
676 elf_x86_64_local_htab_hash
,
677 elf_x86_64_local_htab_eq
,
679 ret
->loc_hash_memory
= objalloc_create ();
680 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
686 return &ret
->elf
.root
;
689 /* Destroy an X86-64 ELF linker hash table. */
692 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table
*hash
)
694 struct elf_x86_64_link_hash_table
*htab
695 = (struct elf_x86_64_link_hash_table
*) hash
;
697 if (htab
->loc_hash_table
)
698 htab_delete (htab
->loc_hash_table
);
699 if (htab
->loc_hash_memory
)
700 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
701 _bfd_generic_link_hash_table_free (hash
);
704 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
705 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
709 elf_x86_64_create_dynamic_sections (bfd
*dynobj
,
710 struct bfd_link_info
*info
)
712 struct elf_x86_64_link_hash_table
*htab
;
714 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
717 htab
= elf_x86_64_hash_table (info
);
721 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
723 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rela.bss");
726 || (!info
->shared
&& !htab
->srelbss
))
732 /* Copy the extra info we tack onto an elf_link_hash_entry. */
735 elf_x86_64_copy_indirect_symbol (struct bfd_link_info
*info
,
736 struct elf_link_hash_entry
*dir
,
737 struct elf_link_hash_entry
*ind
)
739 struct elf_x86_64_link_hash_entry
*edir
, *eind
;
741 edir
= (struct elf_x86_64_link_hash_entry
*) dir
;
742 eind
= (struct elf_x86_64_link_hash_entry
*) ind
;
744 if (eind
->dyn_relocs
!= NULL
)
746 if (edir
->dyn_relocs
!= NULL
)
748 struct elf_dyn_relocs
**pp
;
749 struct elf_dyn_relocs
*p
;
751 /* Add reloc counts against the indirect sym to the direct sym
752 list. Merge any entries against the same section. */
753 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
755 struct elf_dyn_relocs
*q
;
757 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
758 if (q
->sec
== p
->sec
)
760 q
->pc_count
+= p
->pc_count
;
761 q
->count
+= p
->count
;
768 *pp
= edir
->dyn_relocs
;
771 edir
->dyn_relocs
= eind
->dyn_relocs
;
772 eind
->dyn_relocs
= NULL
;
775 if (ind
->root
.type
== bfd_link_hash_indirect
776 && dir
->got
.refcount
<= 0)
778 edir
->tls_type
= eind
->tls_type
;
779 eind
->tls_type
= GOT_UNKNOWN
;
782 if (ELIMINATE_COPY_RELOCS
783 && ind
->root
.type
!= bfd_link_hash_indirect
784 && dir
->dynamic_adjusted
)
786 /* If called to transfer flags for a weakdef during processing
787 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
788 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
789 dir
->ref_dynamic
|= ind
->ref_dynamic
;
790 dir
->ref_regular
|= ind
->ref_regular
;
791 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
792 dir
->needs_plt
|= ind
->needs_plt
;
793 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
796 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
800 elf64_x86_64_elf_object_p (bfd
*abfd
)
802 /* Set the right machine number for an x86-64 elf64 file. */
803 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
821 /* Return TRUE if the TLS access code sequence support transition
825 elf_x86_64_check_tls_transition (bfd
*abfd
,
826 struct bfd_link_info
*info
,
829 Elf_Internal_Shdr
*symtab_hdr
,
830 struct elf_link_hash_entry
**sym_hashes
,
832 const Elf_Internal_Rela
*rel
,
833 const Elf_Internal_Rela
*relend
)
836 unsigned long r_symndx
;
837 struct elf_link_hash_entry
*h
;
839 struct elf_x86_64_link_hash_table
*htab
;
841 /* Get the section contents. */
842 if (contents
== NULL
)
844 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
845 contents
= elf_section_data (sec
)->this_hdr
.contents
;
848 /* FIXME: How to better handle error condition? */
849 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
852 /* Cache the section contents for elf_link_input_bfd. */
853 elf_section_data (sec
)->this_hdr
.contents
= contents
;
857 htab
= elf_x86_64_hash_table (info
);
858 offset
= rel
->r_offset
;
863 if ((rel
+ 1) >= relend
)
866 if (r_type
== R_X86_64_TLSGD
)
868 /* Check transition from GD access model. Only
869 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
870 .word 0x6666; rex64; call __tls_get_addr
871 can transit to different access model. */
873 static x86_64_opcode32 leaq
= { { 0x66, 0x48, 0x8d, 0x3d } },
874 call
= { { 0x66, 0x66, 0x48, 0xe8 } };
876 || (offset
+ 12) > sec
->size
877 || bfd_get_32 (abfd
, contents
+ offset
- 4) != leaq
.i
878 || bfd_get_32 (abfd
, contents
+ offset
+ 4) != call
.i
)
883 /* Check transition from LD access model. Only
884 leaq foo@tlsld(%rip), %rdi;
886 can transit to different access model. */
888 static x86_64_opcode32 ld
= { { 0x48, 0x8d, 0x3d, 0xe8 } };
891 if (offset
< 3 || (offset
+ 9) > sec
->size
)
894 op
.i
= bfd_get_32 (abfd
, contents
+ offset
- 3);
895 op
.c
[3] = bfd_get_8 (abfd
, contents
+ offset
+ 4);
900 r_symndx
= htab
->r_sym (rel
[1].r_info
);
901 if (r_symndx
< symtab_hdr
->sh_info
)
904 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
905 /* Use strncmp to check __tls_get_addr since __tls_get_addr
908 && h
->root
.root
.string
!= NULL
909 && (ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PC32
910 || ELF32_R_TYPE (rel
[1].r_info
) == R_X86_64_PLT32
)
911 && (strncmp (h
->root
.root
.string
,
912 "__tls_get_addr", 14) == 0));
914 case R_X86_64_GOTTPOFF
:
915 /* Check transition from IE access model:
916 movq foo@gottpoff(%rip), %reg
917 addq foo@gottpoff(%rip), %reg
920 if (offset
< 3 || (offset
+ 4) > sec
->size
)
923 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
924 if (val
!= 0x48 && val
!= 0x4c)
927 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
928 if (val
!= 0x8b && val
!= 0x03)
931 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
932 return (val
& 0xc7) == 5;
934 case R_X86_64_GOTPC32_TLSDESC
:
935 /* Check transition from GDesc access model:
936 leaq x@tlsdesc(%rip), %rax
938 Make sure it's a leaq adding rip to a 32-bit offset
939 into any register, although it's probably almost always
942 if (offset
< 3 || (offset
+ 4) > sec
->size
)
945 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
946 if ((val
& 0xfb) != 0x48)
949 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
952 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
953 return (val
& 0xc7) == 0x05;
955 case R_X86_64_TLSDESC_CALL
:
956 /* Check transition from GDesc access model:
957 call *x@tlsdesc(%rax)
959 if (offset
+ 2 <= sec
->size
)
961 /* Make sure that it's a call *x@tlsdesc(%rax). */
962 static x86_64_opcode16 call
= { { 0xff, 0x10 } };
963 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
973 /* Return TRUE if the TLS access transition is OK or no transition
974 will be performed. Update R_TYPE if there is a transition. */
977 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
978 asection
*sec
, bfd_byte
*contents
,
979 Elf_Internal_Shdr
*symtab_hdr
,
980 struct elf_link_hash_entry
**sym_hashes
,
981 unsigned int *r_type
, int tls_type
,
982 const Elf_Internal_Rela
*rel
,
983 const Elf_Internal_Rela
*relend
,
984 struct elf_link_hash_entry
*h
,
985 unsigned long r_symndx
)
987 unsigned int from_type
= *r_type
;
988 unsigned int to_type
= from_type
;
989 bfd_boolean check
= TRUE
;
991 /* Skip TLS transition for functions. */
993 && (h
->type
== STT_FUNC
994 || h
->type
== STT_GNU_IFUNC
))
1000 case R_X86_64_GOTPC32_TLSDESC
:
1001 case R_X86_64_TLSDESC_CALL
:
1002 case R_X86_64_GOTTPOFF
:
1003 if (info
->executable
)
1006 to_type
= R_X86_64_TPOFF32
;
1008 to_type
= R_X86_64_GOTTPOFF
;
1011 /* When we are called from elf_x86_64_relocate_section,
1012 CONTENTS isn't NULL and there may be additional transitions
1013 based on TLS_TYPE. */
1014 if (contents
!= NULL
)
1016 unsigned int new_to_type
= to_type
;
1018 if (info
->executable
1021 && tls_type
== GOT_TLS_IE
)
1022 new_to_type
= R_X86_64_TPOFF32
;
1024 if (to_type
== R_X86_64_TLSGD
1025 || to_type
== R_X86_64_GOTPC32_TLSDESC
1026 || to_type
== R_X86_64_TLSDESC_CALL
)
1028 if (tls_type
== GOT_TLS_IE
)
1029 new_to_type
= R_X86_64_GOTTPOFF
;
1032 /* We checked the transition before when we were called from
1033 elf_x86_64_check_relocs. We only want to check the new
1034 transition which hasn't been checked before. */
1035 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1036 to_type
= new_to_type
;
1041 case R_X86_64_TLSLD
:
1042 if (info
->executable
)
1043 to_type
= R_X86_64_TPOFF32
;
1050 /* Return TRUE if there is no transition. */
1051 if (from_type
== to_type
)
1054 /* Check if the transition can be performed. */
1056 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1057 symtab_hdr
, sym_hashes
,
1058 from_type
, rel
, relend
))
1060 reloc_howto_type
*from
, *to
;
1063 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1064 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1067 name
= h
->root
.root
.string
;
1070 struct elf_x86_64_link_hash_table
*htab
;
1072 htab
= elf_x86_64_hash_table (info
);
1077 Elf_Internal_Sym
*isym
;
1079 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1081 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1085 (*_bfd_error_handler
)
1086 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1087 "in section `%A' failed"),
1088 abfd
, sec
, from
->name
, to
->name
, name
,
1089 (unsigned long) rel
->r_offset
);
1090 bfd_set_error (bfd_error_bad_value
);
1098 /* Look through the relocs for a section during the first phase, and
1099 calculate needed space in the global offset table, procedure
1100 linkage table, and dynamic reloc sections. */
1103 elf_x86_64_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1105 const Elf_Internal_Rela
*relocs
)
1107 struct elf_x86_64_link_hash_table
*htab
;
1108 Elf_Internal_Shdr
*symtab_hdr
;
1109 struct elf_link_hash_entry
**sym_hashes
;
1110 const Elf_Internal_Rela
*rel
;
1111 const Elf_Internal_Rela
*rel_end
;
1114 if (info
->relocatable
)
1117 BFD_ASSERT (is_x86_64_elf (abfd
));
1119 htab
= elf_x86_64_hash_table (info
);
1123 symtab_hdr
= &elf_symtab_hdr (abfd
);
1124 sym_hashes
= elf_sym_hashes (abfd
);
1128 rel_end
= relocs
+ sec
->reloc_count
;
1129 for (rel
= relocs
; rel
< rel_end
; rel
++)
1131 unsigned int r_type
;
1132 unsigned long r_symndx
;
1133 struct elf_link_hash_entry
*h
;
1134 Elf_Internal_Sym
*isym
;
1137 r_symndx
= htab
->r_sym (rel
->r_info
);
1138 r_type
= ELF32_R_TYPE (rel
->r_info
);
1140 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1142 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1147 if (r_symndx
< symtab_hdr
->sh_info
)
1149 /* A local symbol. */
1150 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1155 /* Check relocation against local STT_GNU_IFUNC symbol. */
1156 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1158 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
,
1163 /* Fake a STT_GNU_IFUNC symbol. */
1164 h
->type
= STT_GNU_IFUNC
;
1167 h
->forced_local
= 1;
1168 h
->root
.type
= bfd_link_hash_defined
;
1176 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1177 while (h
->root
.type
== bfd_link_hash_indirect
1178 || h
->root
.type
== bfd_link_hash_warning
)
1179 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1182 /* Check invalid x32 relocations. */
1183 if (!ABI_64_P (abfd
))
1190 case R_X86_64_DTPOFF64
:
1191 case R_X86_64_TPOFF64
:
1193 case R_X86_64_GOTOFF64
:
1194 case R_X86_64_GOT64
:
1195 case R_X86_64_GOTPCREL64
:
1196 case R_X86_64_GOTPC64
:
1197 case R_X86_64_GOTPLT64
:
1198 case R_X86_64_PLTOFF64
:
1201 name
= h
->root
.root
.string
;
1203 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1205 (*_bfd_error_handler
)
1206 (_("%B: relocation %s against symbol `%s' isn't "
1207 "supported in x32 mode"), abfd
,
1208 x86_64_elf_howto_table
[r_type
].name
, name
);
1209 bfd_set_error (bfd_error_bad_value
);
1217 /* Create the ifunc sections for static executables. If we
1218 never see an indirect function symbol nor we are building
1219 a static executable, those sections will be empty and
1220 won't appear in output. */
1231 case R_X86_64_PLT32
:
1232 case R_X86_64_GOTPCREL
:
1233 case R_X86_64_GOTPCREL64
:
1234 if (!_bfd_elf_create_ifunc_sections (abfd
, info
))
1239 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1240 it here if it is defined in a non-shared object. */
1241 if (h
->type
== STT_GNU_IFUNC
1244 /* It is referenced by a non-shared object. */
1248 /* STT_GNU_IFUNC symbol must go through PLT. */
1249 h
->plt
.refcount
+= 1;
1251 /* STT_GNU_IFUNC needs dynamic sections. */
1252 if (htab
->elf
.dynobj
== NULL
)
1253 htab
->elf
.dynobj
= abfd
;
1258 if (h
->root
.root
.string
)
1259 name
= h
->root
.root
.string
;
1261 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1263 (*_bfd_error_handler
)
1264 (_("%B: relocation %s against STT_GNU_IFUNC "
1265 "symbol `%s' isn't handled by %s"), abfd
,
1266 x86_64_elf_howto_table
[r_type
].name
,
1267 name
, __FUNCTION__
);
1268 bfd_set_error (bfd_error_bad_value
);
1272 if (ABI_64_P (abfd
))
1276 h
->pointer_equality_needed
= 1;
1279 /* We must copy these reloc types into the output
1280 file. Create a reloc section in dynobj and
1281 make room for this reloc. */
1282 sreloc
= _bfd_elf_create_ifunc_dyn_reloc
1283 (abfd
, info
, sec
, sreloc
,
1284 &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
);
1295 if (r_type
!= R_X86_64_PC32
1296 && r_type
!= R_X86_64_PC64
)
1297 h
->pointer_equality_needed
= 1;
1300 case R_X86_64_PLT32
:
1303 case R_X86_64_GOTPCREL
:
1304 case R_X86_64_GOTPCREL64
:
1305 h
->got
.refcount
+= 1;
1306 if (htab
->elf
.sgot
== NULL
1307 && !_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1317 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1318 symtab_hdr
, sym_hashes
,
1319 &r_type
, GOT_UNKNOWN
,
1320 rel
, rel_end
, h
, r_symndx
))
1325 case R_X86_64_TLSLD
:
1326 htab
->tls_ld_got
.refcount
+= 1;
1329 case R_X86_64_TPOFF32
:
1330 if (!info
->executable
&& ABI_64_P (abfd
))
1333 name
= h
->root
.root
.string
;
1335 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1337 (*_bfd_error_handler
)
1338 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1340 x86_64_elf_howto_table
[r_type
].name
, name
);
1341 bfd_set_error (bfd_error_bad_value
);
1346 case R_X86_64_GOTTPOFF
:
1347 if (!info
->executable
)
1348 info
->flags
|= DF_STATIC_TLS
;
1351 case R_X86_64_GOT32
:
1352 case R_X86_64_GOTPCREL
:
1353 case R_X86_64_TLSGD
:
1354 case R_X86_64_GOT64
:
1355 case R_X86_64_GOTPCREL64
:
1356 case R_X86_64_GOTPLT64
:
1357 case R_X86_64_GOTPC32_TLSDESC
:
1358 case R_X86_64_TLSDESC_CALL
:
1359 /* This symbol requires a global offset table entry. */
1361 int tls_type
, old_tls_type
;
1365 default: tls_type
= GOT_NORMAL
; break;
1366 case R_X86_64_TLSGD
: tls_type
= GOT_TLS_GD
; break;
1367 case R_X86_64_GOTTPOFF
: tls_type
= GOT_TLS_IE
; break;
1368 case R_X86_64_GOTPC32_TLSDESC
:
1369 case R_X86_64_TLSDESC_CALL
:
1370 tls_type
= GOT_TLS_GDESC
; break;
1375 if (r_type
== R_X86_64_GOTPLT64
)
1377 /* This relocation indicates that we also need
1378 a PLT entry, as this is a function. We don't need
1379 a PLT entry for local symbols. */
1381 h
->plt
.refcount
+= 1;
1383 h
->got
.refcount
+= 1;
1384 old_tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
1388 bfd_signed_vma
*local_got_refcounts
;
1390 /* This is a global offset table entry for a local symbol. */
1391 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1392 if (local_got_refcounts
== NULL
)
1396 size
= symtab_hdr
->sh_info
;
1397 size
*= sizeof (bfd_signed_vma
)
1398 + sizeof (bfd_vma
) + sizeof (char);
1399 local_got_refcounts
= ((bfd_signed_vma
*)
1400 bfd_zalloc (abfd
, size
));
1401 if (local_got_refcounts
== NULL
)
1403 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1404 elf_x86_64_local_tlsdesc_gotent (abfd
)
1405 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1406 elf_x86_64_local_got_tls_type (abfd
)
1407 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1409 local_got_refcounts
[r_symndx
] += 1;
1411 = elf_x86_64_local_got_tls_type (abfd
) [r_symndx
];
1414 /* If a TLS symbol is accessed using IE at least once,
1415 there is no point to use dynamic model for it. */
1416 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1417 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1418 || tls_type
!= GOT_TLS_IE
))
1420 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
1421 tls_type
= old_tls_type
;
1422 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1423 && GOT_TLS_GD_ANY_P (tls_type
))
1424 tls_type
|= old_tls_type
;
1428 name
= h
->root
.root
.string
;
1430 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1432 (*_bfd_error_handler
)
1433 (_("%B: '%s' accessed both as normal and thread local symbol"),
1439 if (old_tls_type
!= tls_type
)
1442 elf_x86_64_hash_entry (h
)->tls_type
= tls_type
;
1444 elf_x86_64_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1449 case R_X86_64_GOTOFF64
:
1450 case R_X86_64_GOTPC32
:
1451 case R_X86_64_GOTPC64
:
1453 if (htab
->elf
.sgot
== NULL
)
1455 if (htab
->elf
.dynobj
== NULL
)
1456 htab
->elf
.dynobj
= abfd
;
1457 if (!_bfd_elf_create_got_section (htab
->elf
.dynobj
,
1463 case R_X86_64_PLT32
:
1464 /* This symbol requires a procedure linkage table entry. We
1465 actually build the entry in adjust_dynamic_symbol,
1466 because this might be a case of linking PIC code which is
1467 never referenced by a dynamic object, in which case we
1468 don't need to generate a procedure linkage table entry
1471 /* If this is a local symbol, we resolve it directly without
1472 creating a procedure linkage table entry. */
1477 h
->plt
.refcount
+= 1;
1480 case R_X86_64_PLTOFF64
:
1481 /* This tries to form the 'address' of a function relative
1482 to GOT. For global symbols we need a PLT entry. */
1486 h
->plt
.refcount
+= 1;
1491 if (!ABI_64_P (abfd
))
1496 /* Let's help debug shared library creation. These relocs
1497 cannot be used in shared libs. Don't error out for
1498 sections we don't care about, such as debug sections or
1499 non-constant sections. */
1501 && (sec
->flags
& SEC_ALLOC
) != 0
1502 && (sec
->flags
& SEC_READONLY
) != 0)
1505 name
= h
->root
.root
.string
;
1507 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1508 (*_bfd_error_handler
)
1509 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1510 abfd
, x86_64_elf_howto_table
[r_type
].name
, name
);
1511 bfd_set_error (bfd_error_bad_value
);
1522 if (h
!= NULL
&& info
->executable
)
1524 /* If this reloc is in a read-only section, we might
1525 need a copy reloc. We can't check reliably at this
1526 stage whether the section is read-only, as input
1527 sections have not yet been mapped to output sections.
1528 Tentatively set the flag for now, and correct in
1529 adjust_dynamic_symbol. */
1532 /* We may need a .plt entry if the function this reloc
1533 refers to is in a shared lib. */
1534 h
->plt
.refcount
+= 1;
1535 if (r_type
!= R_X86_64_PC32
&& r_type
!= R_X86_64_PC64
)
1536 h
->pointer_equality_needed
= 1;
1539 /* If we are creating a shared library, and this is a reloc
1540 against a global symbol, or a non PC relative reloc
1541 against a local symbol, then we need to copy the reloc
1542 into the shared library. However, if we are linking with
1543 -Bsymbolic, we do not need to copy a reloc against a
1544 global symbol which is defined in an object we are
1545 including in the link (i.e., DEF_REGULAR is set). At
1546 this point we have not seen all the input files, so it is
1547 possible that DEF_REGULAR is not set now but will be set
1548 later (it is never cleared). In case of a weak definition,
1549 DEF_REGULAR may be cleared later by a strong definition in
1550 a shared library. We account for that possibility below by
1551 storing information in the relocs_copied field of the hash
1552 table entry. A similar situation occurs when creating
1553 shared libraries and symbol visibility changes render the
1556 If on the other hand, we are creating an executable, we
1557 may need to keep relocations for symbols satisfied by a
1558 dynamic library if we manage to avoid copy relocs for the
1561 && (sec
->flags
& SEC_ALLOC
) != 0
1562 && (! IS_X86_64_PCREL_TYPE (r_type
)
1564 && (! SYMBOLIC_BIND (info
, h
)
1565 || h
->root
.type
== bfd_link_hash_defweak
1566 || !h
->def_regular
))))
1567 || (ELIMINATE_COPY_RELOCS
1569 && (sec
->flags
& SEC_ALLOC
) != 0
1571 && (h
->root
.type
== bfd_link_hash_defweak
1572 || !h
->def_regular
)))
1574 struct elf_dyn_relocs
*p
;
1575 struct elf_dyn_relocs
**head
;
1577 /* We must copy these reloc types into the output file.
1578 Create a reloc section in dynobj and make room for
1582 if (htab
->elf
.dynobj
== NULL
)
1583 htab
->elf
.dynobj
= abfd
;
1585 sreloc
= _bfd_elf_make_dynamic_reloc_section
1586 (sec
, htab
->elf
.dynobj
, ABI_64_P (abfd
) ? 3 : 2,
1587 abfd
, /*rela?*/ TRUE
);
1593 /* If this is a global symbol, we count the number of
1594 relocations we need for this symbol. */
1597 head
= &((struct elf_x86_64_link_hash_entry
*) h
)->dyn_relocs
;
1601 /* Track dynamic relocs needed for local syms too.
1602 We really need local syms available to do this
1607 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1612 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1616 /* Beware of type punned pointers vs strict aliasing
1618 vpp
= &(elf_section_data (s
)->local_dynrel
);
1619 head
= (struct elf_dyn_relocs
**)vpp
;
1623 if (p
== NULL
|| p
->sec
!= sec
)
1625 bfd_size_type amt
= sizeof *p
;
1627 p
= ((struct elf_dyn_relocs
*)
1628 bfd_alloc (htab
->elf
.dynobj
, amt
));
1639 if (IS_X86_64_PCREL_TYPE (r_type
))
1644 /* This relocation describes the C++ object vtable hierarchy.
1645 Reconstruct it for later use during GC. */
1646 case R_X86_64_GNU_VTINHERIT
:
1647 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1651 /* This relocation describes which C++ vtable entries are actually
1652 used. Record for later use during GC. */
1653 case R_X86_64_GNU_VTENTRY
:
1654 BFD_ASSERT (h
!= NULL
);
1656 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1668 /* Return the section that should be marked against GC for a given
1672 elf_x86_64_gc_mark_hook (asection
*sec
,
1673 struct bfd_link_info
*info
,
1674 Elf_Internal_Rela
*rel
,
1675 struct elf_link_hash_entry
*h
,
1676 Elf_Internal_Sym
*sym
)
1679 switch (ELF32_R_TYPE (rel
->r_info
))
1681 case R_X86_64_GNU_VTINHERIT
:
1682 case R_X86_64_GNU_VTENTRY
:
1686 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1689 /* Update the got entry reference counts for the section being removed. */
1692 elf_x86_64_gc_sweep_hook (bfd
*abfd
, struct bfd_link_info
*info
,
1694 const Elf_Internal_Rela
*relocs
)
1696 struct elf_x86_64_link_hash_table
*htab
;
1697 Elf_Internal_Shdr
*symtab_hdr
;
1698 struct elf_link_hash_entry
**sym_hashes
;
1699 bfd_signed_vma
*local_got_refcounts
;
1700 const Elf_Internal_Rela
*rel
, *relend
;
1702 if (info
->relocatable
)
1705 htab
= elf_x86_64_hash_table (info
);
1709 elf_section_data (sec
)->local_dynrel
= NULL
;
1711 symtab_hdr
= &elf_symtab_hdr (abfd
);
1712 sym_hashes
= elf_sym_hashes (abfd
);
1713 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1715 htab
= elf_x86_64_hash_table (info
);
1716 relend
= relocs
+ sec
->reloc_count
;
1717 for (rel
= relocs
; rel
< relend
; rel
++)
1719 unsigned long r_symndx
;
1720 unsigned int r_type
;
1721 struct elf_link_hash_entry
*h
= NULL
;
1723 r_symndx
= htab
->r_sym (rel
->r_info
);
1724 if (r_symndx
>= symtab_hdr
->sh_info
)
1726 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1727 while (h
->root
.type
== bfd_link_hash_indirect
1728 || h
->root
.type
== bfd_link_hash_warning
)
1729 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1733 /* A local symbol. */
1734 Elf_Internal_Sym
*isym
;
1736 isym
= bfd_sym_from_r_symndx (&htab
->sym_cache
,
1739 /* Check relocation against local STT_GNU_IFUNC symbol. */
1741 && ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1743 h
= elf_x86_64_get_local_sym_hash (htab
, abfd
, rel
, FALSE
);
1751 struct elf_x86_64_link_hash_entry
*eh
;
1752 struct elf_dyn_relocs
**pp
;
1753 struct elf_dyn_relocs
*p
;
1755 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
1757 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1760 /* Everything must go for SEC. */
1766 r_type
= ELF32_R_TYPE (rel
->r_info
);
1767 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, NULL
,
1768 symtab_hdr
, sym_hashes
,
1769 &r_type
, GOT_UNKNOWN
,
1770 rel
, relend
, h
, r_symndx
))
1775 case R_X86_64_TLSLD
:
1776 if (htab
->tls_ld_got
.refcount
> 0)
1777 htab
->tls_ld_got
.refcount
-= 1;
1780 case R_X86_64_TLSGD
:
1781 case R_X86_64_GOTPC32_TLSDESC
:
1782 case R_X86_64_TLSDESC_CALL
:
1783 case R_X86_64_GOTTPOFF
:
1784 case R_X86_64_GOT32
:
1785 case R_X86_64_GOTPCREL
:
1786 case R_X86_64_GOT64
:
1787 case R_X86_64_GOTPCREL64
:
1788 case R_X86_64_GOTPLT64
:
1791 if (r_type
== R_X86_64_GOTPLT64
&& h
->plt
.refcount
> 0)
1792 h
->plt
.refcount
-= 1;
1793 if (h
->got
.refcount
> 0)
1794 h
->got
.refcount
-= 1;
1795 if (h
->type
== STT_GNU_IFUNC
)
1797 if (h
->plt
.refcount
> 0)
1798 h
->plt
.refcount
-= 1;
1801 else if (local_got_refcounts
!= NULL
)
1803 if (local_got_refcounts
[r_symndx
] > 0)
1804 local_got_refcounts
[r_symndx
] -= 1;
1818 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
1822 case R_X86_64_PLT32
:
1823 case R_X86_64_PLTOFF64
:
1826 if (h
->plt
.refcount
> 0)
1827 h
->plt
.refcount
-= 1;
1839 /* Adjust a symbol defined by a dynamic object and referenced by a
1840 regular object. The current definition is in some section of the
1841 dynamic object, but we're not including those sections. We have to
1842 change the definition to something the rest of the link can
1846 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1847 struct elf_link_hash_entry
*h
)
1849 struct elf_x86_64_link_hash_table
*htab
;
1852 /* STT_GNU_IFUNC symbol must go through PLT. */
1853 if (h
->type
== STT_GNU_IFUNC
)
1855 if (h
->plt
.refcount
<= 0)
1857 h
->plt
.offset
= (bfd_vma
) -1;
1863 /* If this is a function, put it in the procedure linkage table. We
1864 will fill in the contents of the procedure linkage table later,
1865 when we know the address of the .got section. */
1866 if (h
->type
== STT_FUNC
1869 if (h
->plt
.refcount
<= 0
1870 || SYMBOL_CALLS_LOCAL (info
, h
)
1871 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1872 && h
->root
.type
== bfd_link_hash_undefweak
))
1874 /* This case can occur if we saw a PLT32 reloc in an input
1875 file, but the symbol was never referred to by a dynamic
1876 object, or if all references were garbage collected. In
1877 such a case, we don't actually need to build a procedure
1878 linkage table, and we can just do a PC32 reloc instead. */
1879 h
->plt
.offset
= (bfd_vma
) -1;
1886 /* It's possible that we incorrectly decided a .plt reloc was
1887 needed for an R_X86_64_PC32 reloc to a non-function sym in
1888 check_relocs. We can't decide accurately between function and
1889 non-function syms in check-relocs; Objects loaded later in
1890 the link may change h->type. So fix it now. */
1891 h
->plt
.offset
= (bfd_vma
) -1;
1893 /* If this is a weak symbol, and there is a real definition, the
1894 processor independent code will have arranged for us to see the
1895 real definition first, and we can just use the same value. */
1896 if (h
->u
.weakdef
!= NULL
)
1898 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1899 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1900 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1901 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1902 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
1903 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1907 /* This is a reference to a symbol defined by a dynamic object which
1908 is not a function. */
1910 /* If we are creating a shared library, we must presume that the
1911 only references to the symbol are via the global offset table.
1912 For such cases we need not do anything here; the relocations will
1913 be handled correctly by relocate_section. */
1917 /* If there are no references to this symbol that do not use the
1918 GOT, we don't need to generate a copy reloc. */
1919 if (!h
->non_got_ref
)
1922 /* If -z nocopyreloc was given, we won't generate them either. */
1923 if (info
->nocopyreloc
)
1929 if (ELIMINATE_COPY_RELOCS
)
1931 struct elf_x86_64_link_hash_entry
* eh
;
1932 struct elf_dyn_relocs
*p
;
1934 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
1935 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1937 s
= p
->sec
->output_section
;
1938 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1942 /* If we didn't find any dynamic relocs in read-only sections, then
1943 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1953 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
1954 h
->root
.root
.string
);
1958 /* We must allocate the symbol in our .dynbss section, which will
1959 become part of the .bss section of the executable. There will be
1960 an entry for this symbol in the .dynsym section. The dynamic
1961 object will contain position independent code, so all references
1962 from the dynamic object to this symbol will go through the global
1963 offset table. The dynamic linker will use the .dynsym entry to
1964 determine the address it must put in the global offset table, so
1965 both the dynamic object and the regular object will refer to the
1966 same memory location for the variable. */
1968 htab
= elf_x86_64_hash_table (info
);
1972 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1973 to copy the initial value out of the dynamic object and into the
1974 runtime process image. */
1975 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1977 const struct elf_backend_data
*bed
;
1978 bed
= get_elf_backend_data (info
->output_bfd
);
1979 htab
->srelbss
->size
+= bed
->s
->sizeof_rela
;
1985 return _bfd_elf_adjust_dynamic_copy (h
, s
);
1988 /* Allocate space in .plt, .got and associated reloc sections for
1992 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
1994 struct bfd_link_info
*info
;
1995 struct elf_x86_64_link_hash_table
*htab
;
1996 struct elf_x86_64_link_hash_entry
*eh
;
1997 struct elf_dyn_relocs
*p
;
1998 const struct elf_backend_data
*bed
;
2000 if (h
->root
.type
== bfd_link_hash_indirect
)
2003 if (h
->root
.type
== bfd_link_hash_warning
)
2004 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2005 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2007 info
= (struct bfd_link_info
*) inf
;
2008 htab
= elf_x86_64_hash_table (info
);
2011 bed
= get_elf_backend_data (info
->output_bfd
);
2013 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2014 here if it is defined and referenced in a non-shared object. */
2015 if (h
->type
== STT_GNU_IFUNC
2017 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
2021 else if (htab
->elf
.dynamic_sections_created
2022 && h
->plt
.refcount
> 0)
2024 /* Make sure this symbol is output as a dynamic symbol.
2025 Undefined weak syms won't yet be marked as dynamic. */
2026 if (h
->dynindx
== -1
2027 && !h
->forced_local
)
2029 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2034 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2036 asection
*s
= htab
->elf
.splt
;
2038 /* If this is the first .plt entry, make room for the special
2041 s
->size
+= PLT_ENTRY_SIZE
;
2043 h
->plt
.offset
= s
->size
;
2045 /* If this symbol is not defined in a regular file, and we are
2046 not generating a shared library, then set the symbol to this
2047 location in the .plt. This is required to make function
2048 pointers compare as equal between the normal executable and
2049 the shared library. */
2053 h
->root
.u
.def
.section
= s
;
2054 h
->root
.u
.def
.value
= h
->plt
.offset
;
2057 /* Make room for this entry. */
2058 s
->size
+= PLT_ENTRY_SIZE
;
2060 /* We also need to make an entry in the .got.plt section, which
2061 will be placed in the .got section by the linker script. */
2062 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
2064 /* We also need to make an entry in the .rela.plt section. */
2065 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2066 htab
->elf
.srelplt
->reloc_count
++;
2070 h
->plt
.offset
= (bfd_vma
) -1;
2076 h
->plt
.offset
= (bfd_vma
) -1;
2080 eh
->tlsdesc_got
= (bfd_vma
) -1;
2082 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2083 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2084 if (h
->got
.refcount
> 0
2087 && elf_x86_64_hash_entry (h
)->tls_type
== GOT_TLS_IE
)
2089 h
->got
.offset
= (bfd_vma
) -1;
2091 else if (h
->got
.refcount
> 0)
2095 int tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
2097 /* Make sure this symbol is output as a dynamic symbol.
2098 Undefined weak syms won't yet be marked as dynamic. */
2099 if (h
->dynindx
== -1
2100 && !h
->forced_local
)
2102 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2106 if (GOT_TLS_GDESC_P (tls_type
))
2108 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
2109 - elf_x86_64_compute_jump_table_size (htab
);
2110 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2111 h
->got
.offset
= (bfd_vma
) -2;
2113 if (! GOT_TLS_GDESC_P (tls_type
)
2114 || GOT_TLS_GD_P (tls_type
))
2117 h
->got
.offset
= s
->size
;
2118 s
->size
+= GOT_ENTRY_SIZE
;
2119 if (GOT_TLS_GD_P (tls_type
))
2120 s
->size
+= GOT_ENTRY_SIZE
;
2122 dyn
= htab
->elf
.dynamic_sections_created
;
2123 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2125 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2126 if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2127 || tls_type
== GOT_TLS_IE
)
2128 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2129 else if (GOT_TLS_GD_P (tls_type
))
2130 htab
->elf
.srelgot
->size
+= 2 * bed
->s
->sizeof_rela
;
2131 else if (! GOT_TLS_GDESC_P (tls_type
)
2132 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2133 || h
->root
.type
!= bfd_link_hash_undefweak
)
2135 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2136 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2137 if (GOT_TLS_GDESC_P (tls_type
))
2139 htab
->elf
.srelplt
->size
+= bed
->s
->sizeof_rela
;
2140 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2144 h
->got
.offset
= (bfd_vma
) -1;
2146 if (eh
->dyn_relocs
== NULL
)
2149 /* In the shared -Bsymbolic case, discard space allocated for
2150 dynamic pc-relative relocs against symbols which turn out to be
2151 defined in regular objects. For the normal shared case, discard
2152 space for pc-relative relocs that have become local due to symbol
2153 visibility changes. */
2157 /* Relocs that use pc_count are those that appear on a call
2158 insn, or certain REL relocs that can generated via assembly.
2159 We want calls to protected symbols to resolve directly to the
2160 function rather than going via the plt. If people want
2161 function pointer comparisons to work as expected then they
2162 should avoid writing weird assembly. */
2163 if (SYMBOL_CALLS_LOCAL (info
, h
))
2165 struct elf_dyn_relocs
**pp
;
2167 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2169 p
->count
-= p
->pc_count
;
2178 /* Also discard relocs on undefined weak syms with non-default
2180 if (eh
->dyn_relocs
!= NULL
2181 && h
->root
.type
== bfd_link_hash_undefweak
)
2183 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2184 eh
->dyn_relocs
= NULL
;
2186 /* Make sure undefined weak symbols are output as a dynamic
2188 else if (h
->dynindx
== -1
2189 && ! h
->forced_local
2190 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2195 else if (ELIMINATE_COPY_RELOCS
)
2197 /* For the non-shared case, discard space for relocs against
2198 symbols which turn out to need copy relocs or are not
2204 || (htab
->elf
.dynamic_sections_created
2205 && (h
->root
.type
== bfd_link_hash_undefweak
2206 || h
->root
.type
== bfd_link_hash_undefined
))))
2208 /* Make sure this symbol is output as a dynamic symbol.
2209 Undefined weak syms won't yet be marked as dynamic. */
2210 if (h
->dynindx
== -1
2211 && ! h
->forced_local
2212 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
2215 /* If that succeeded, we know we'll be keeping all the
2217 if (h
->dynindx
!= -1)
2221 eh
->dyn_relocs
= NULL
;
2226 /* Finally, allocate space. */
2227 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2231 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2233 BFD_ASSERT (sreloc
!= NULL
);
2235 sreloc
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2241 /* Allocate space in .plt, .got and associated reloc sections for
2242 local dynamic relocs. */
2245 elf_x86_64_allocate_local_dynrelocs (void **slot
, void *inf
)
2247 struct elf_link_hash_entry
*h
2248 = (struct elf_link_hash_entry
*) *slot
;
2250 if (h
->type
!= STT_GNU_IFUNC
2254 || h
->root
.type
!= bfd_link_hash_defined
)
2257 return elf_x86_64_allocate_dynrelocs (h
, inf
);
2260 /* Find any dynamic relocs that apply to read-only sections. */
2263 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
2266 struct elf_x86_64_link_hash_entry
*eh
;
2267 struct elf_dyn_relocs
*p
;
2269 if (h
->root
.type
== bfd_link_hash_warning
)
2270 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2272 eh
= (struct elf_x86_64_link_hash_entry
*) h
;
2273 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2275 asection
*s
= p
->sec
->output_section
;
2277 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2279 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2281 info
->flags
|= DF_TEXTREL
;
2283 /* Not an error, just cut short the traversal. */
2290 /* Set the sizes of the dynamic sections. */
2293 elf_x86_64_size_dynamic_sections (bfd
*output_bfd
,
2294 struct bfd_link_info
*info
)
2296 struct elf_x86_64_link_hash_table
*htab
;
2301 const struct elf_backend_data
*bed
;
2303 htab
= elf_x86_64_hash_table (info
);
2306 bed
= get_elf_backend_data (output_bfd
);
2308 dynobj
= htab
->elf
.dynobj
;
2312 if (htab
->elf
.dynamic_sections_created
)
2314 /* Set the contents of the .interp section to the interpreter. */
2315 if (info
->executable
)
2317 s
= bfd_get_section_by_name (dynobj
, ".interp");
2320 s
->size
= htab
->dynamic_interpreter_size
;
2321 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2325 /* Set up .got offsets for local syms, and space for local dynamic
2327 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2329 bfd_signed_vma
*local_got
;
2330 bfd_signed_vma
*end_local_got
;
2331 char *local_tls_type
;
2332 bfd_vma
*local_tlsdesc_gotent
;
2333 bfd_size_type locsymcount
;
2334 Elf_Internal_Shdr
*symtab_hdr
;
2337 if (! is_x86_64_elf (ibfd
))
2340 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2342 struct elf_dyn_relocs
*p
;
2344 for (p
= (struct elf_dyn_relocs
*)
2345 (elf_section_data (s
)->local_dynrel
);
2349 if (!bfd_is_abs_section (p
->sec
)
2350 && bfd_is_abs_section (p
->sec
->output_section
))
2352 /* Input section has been discarded, either because
2353 it is a copy of a linkonce section or due to
2354 linker script /DISCARD/, so we'll be discarding
2357 else if (p
->count
!= 0)
2359 srel
= elf_section_data (p
->sec
)->sreloc
;
2360 srel
->size
+= p
->count
* bed
->s
->sizeof_rela
;
2361 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2362 info
->flags
|= DF_TEXTREL
;
2367 local_got
= elf_local_got_refcounts (ibfd
);
2371 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2372 locsymcount
= symtab_hdr
->sh_info
;
2373 end_local_got
= local_got
+ locsymcount
;
2374 local_tls_type
= elf_x86_64_local_got_tls_type (ibfd
);
2375 local_tlsdesc_gotent
= elf_x86_64_local_tlsdesc_gotent (ibfd
);
2377 srel
= htab
->elf
.srelgot
;
2378 for (; local_got
< end_local_got
;
2379 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2381 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2384 if (GOT_TLS_GDESC_P (*local_tls_type
))
2386 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
2387 - elf_x86_64_compute_jump_table_size (htab
);
2388 htab
->elf
.sgotplt
->size
+= 2 * GOT_ENTRY_SIZE
;
2389 *local_got
= (bfd_vma
) -2;
2391 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2392 || GOT_TLS_GD_P (*local_tls_type
))
2394 *local_got
= s
->size
;
2395 s
->size
+= GOT_ENTRY_SIZE
;
2396 if (GOT_TLS_GD_P (*local_tls_type
))
2397 s
->size
+= GOT_ENTRY_SIZE
;
2400 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2401 || *local_tls_type
== GOT_TLS_IE
)
2403 if (GOT_TLS_GDESC_P (*local_tls_type
))
2405 htab
->elf
.srelplt
->size
2406 += bed
->s
->sizeof_rela
;
2407 htab
->tlsdesc_plt
= (bfd_vma
) -1;
2409 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2410 || GOT_TLS_GD_P (*local_tls_type
))
2411 srel
->size
+= bed
->s
->sizeof_rela
;
2415 *local_got
= (bfd_vma
) -1;
2419 if (htab
->tls_ld_got
.refcount
> 0)
2421 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2423 htab
->tls_ld_got
.offset
= htab
->elf
.sgot
->size
;
2424 htab
->elf
.sgot
->size
+= 2 * GOT_ENTRY_SIZE
;
2425 htab
->elf
.srelgot
->size
+= bed
->s
->sizeof_rela
;
2428 htab
->tls_ld_got
.offset
= -1;
2430 /* Allocate global sym .plt and .got entries, and space for global
2431 sym dynamic relocs. */
2432 elf_link_hash_traverse (&htab
->elf
, elf_x86_64_allocate_dynrelocs
,
2435 /* Allocate .plt and .got entries, and space for local symbols. */
2436 htab_traverse (htab
->loc_hash_table
,
2437 elf_x86_64_allocate_local_dynrelocs
,
2440 /* For every jump slot reserved in the sgotplt, reloc_count is
2441 incremented. However, when we reserve space for TLS descriptors,
2442 it's not incremented, so in order to compute the space reserved
2443 for them, it suffices to multiply the reloc count by the jump
2445 if (htab
->elf
.srelplt
)
2446 htab
->sgotplt_jump_table_size
2447 = elf_x86_64_compute_jump_table_size (htab
);
2449 if (htab
->tlsdesc_plt
)
2451 /* If we're not using lazy TLS relocations, don't generate the
2452 PLT and GOT entries they require. */
2453 if ((info
->flags
& DF_BIND_NOW
))
2454 htab
->tlsdesc_plt
= 0;
2457 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
2458 htab
->elf
.sgot
->size
+= GOT_ENTRY_SIZE
;
2459 /* Reserve room for the initial entry.
2460 FIXME: we could probably do away with it in this case. */
2461 if (htab
->elf
.splt
->size
== 0)
2462 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2463 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
2464 htab
->elf
.splt
->size
+= PLT_ENTRY_SIZE
;
2468 if (htab
->elf
.sgotplt
)
2470 struct elf_link_hash_entry
*got
;
2471 got
= elf_link_hash_lookup (elf_hash_table (info
),
2472 "_GLOBAL_OFFSET_TABLE_",
2473 FALSE
, FALSE
, FALSE
);
2475 /* Don't allocate .got.plt section if there are no GOT nor PLT
2476 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2478 || !got
->ref_regular_nonweak
)
2479 && (htab
->elf
.sgotplt
->size
2480 == get_elf_backend_data (output_bfd
)->got_header_size
)
2481 && (htab
->elf
.splt
== NULL
2482 || htab
->elf
.splt
->size
== 0)
2483 && (htab
->elf
.sgot
== NULL
2484 || htab
->elf
.sgot
->size
== 0)
2485 && (htab
->elf
.iplt
== NULL
2486 || htab
->elf
.iplt
->size
== 0)
2487 && (htab
->elf
.igotplt
== NULL
2488 || htab
->elf
.igotplt
->size
== 0))
2489 htab
->elf
.sgotplt
->size
= 0;
2492 /* We now have determined the sizes of the various dynamic sections.
2493 Allocate memory for them. */
2495 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2497 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2500 if (s
== htab
->elf
.splt
2501 || s
== htab
->elf
.sgot
2502 || s
== htab
->elf
.sgotplt
2503 || s
== htab
->elf
.iplt
2504 || s
== htab
->elf
.igotplt
2505 || s
== htab
->sdynbss
)
2507 /* Strip this section if we don't need it; see the
2510 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rela"))
2512 if (s
->size
!= 0 && s
!= htab
->elf
.srelplt
)
2515 /* We use the reloc_count field as a counter if we need
2516 to copy relocs into the output file. */
2517 if (s
!= htab
->elf
.srelplt
)
2522 /* It's not one of our sections, so don't allocate space. */
2528 /* If we don't need this section, strip it from the
2529 output file. This is mostly to handle .rela.bss and
2530 .rela.plt. We must create both sections in
2531 create_dynamic_sections, because they must be created
2532 before the linker maps input sections to output
2533 sections. The linker does that before
2534 adjust_dynamic_symbol is called, and it is that
2535 function which decides whether anything needs to go
2536 into these sections. */
2538 s
->flags
|= SEC_EXCLUDE
;
2542 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2545 /* Allocate memory for the section contents. We use bfd_zalloc
2546 here in case unused entries are not reclaimed before the
2547 section's contents are written out. This should not happen,
2548 but this way if it does, we get a R_X86_64_NONE reloc instead
2550 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
2551 if (s
->contents
== NULL
)
2555 if (htab
->elf
.dynamic_sections_created
)
2557 /* Add some entries to the .dynamic section. We fill in the
2558 values later, in elf_x86_64_finish_dynamic_sections, but we
2559 must add the entries now so that we get the correct size for
2560 the .dynamic section. The DT_DEBUG entry is filled in by the
2561 dynamic linker and used by the debugger. */
2562 #define add_dynamic_entry(TAG, VAL) \
2563 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2565 if (info
->executable
)
2567 if (!add_dynamic_entry (DT_DEBUG
, 0))
2571 if (htab
->elf
.splt
->size
!= 0)
2573 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2574 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2575 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
2576 || !add_dynamic_entry (DT_JMPREL
, 0))
2579 if (htab
->tlsdesc_plt
2580 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
2581 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
2587 if (!add_dynamic_entry (DT_RELA
, 0)
2588 || !add_dynamic_entry (DT_RELASZ
, 0)
2589 || !add_dynamic_entry (DT_RELAENT
, bed
->s
->sizeof_rela
))
2592 /* If any dynamic relocs apply to a read-only section,
2593 then we need a DT_TEXTREL entry. */
2594 if ((info
->flags
& DF_TEXTREL
) == 0)
2595 elf_link_hash_traverse (&htab
->elf
,
2596 elf_x86_64_readonly_dynrelocs
,
2599 if ((info
->flags
& DF_TEXTREL
) != 0)
2601 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2606 #undef add_dynamic_entry
2612 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2613 struct bfd_link_info
*info
)
2615 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2619 struct elf_link_hash_entry
*tlsbase
;
2621 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2622 "_TLS_MODULE_BASE_",
2623 FALSE
, FALSE
, FALSE
);
2625 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2627 struct elf_x86_64_link_hash_table
*htab
;
2628 struct bfd_link_hash_entry
*bh
= NULL
;
2629 const struct elf_backend_data
*bed
2630 = get_elf_backend_data (output_bfd
);
2632 htab
= elf_x86_64_hash_table (info
);
2636 if (!(_bfd_generic_link_add_one_symbol
2637 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2638 tls_sec
, 0, NULL
, FALSE
,
2639 bed
->collect
, &bh
)))
2642 htab
->tls_module_base
= bh
;
2644 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2645 tlsbase
->def_regular
= 1;
2646 tlsbase
->other
= STV_HIDDEN
;
2647 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2654 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2655 executables. Rather than setting it to the beginning of the TLS
2656 section, we have to set it to the end. This function may be called
2657 multiple times, it is idempotent. */
2660 elf_x86_64_set_tls_module_base (struct bfd_link_info
*info
)
2662 struct elf_x86_64_link_hash_table
*htab
;
2663 struct bfd_link_hash_entry
*base
;
2665 if (!info
->executable
)
2668 htab
= elf_x86_64_hash_table (info
);
2672 base
= htab
->tls_module_base
;
2676 base
->u
.def
.value
= htab
->elf
.tls_size
;
2679 /* Return the base VMA address which should be subtracted from real addresses
2680 when resolving @dtpoff relocation.
2681 This is PT_TLS segment p_vaddr. */
2684 elf_x86_64_dtpoff_base (struct bfd_link_info
*info
)
2686 /* If tls_sec is NULL, we should have signalled an error already. */
2687 if (elf_hash_table (info
)->tls_sec
== NULL
)
2689 return elf_hash_table (info
)->tls_sec
->vma
;
2692 /* Return the relocation value for @tpoff relocation
2693 if STT_TLS virtual address is ADDRESS. */
2696 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2698 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2699 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2700 bfd_vma static_tls_size
;
2702 /* If tls_segment is NULL, we should have signalled an error already. */
2703 if (htab
->tls_sec
== NULL
)
2706 /* Consider special static TLS alignment requirements. */
2707 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2708 return address
- static_tls_size
- htab
->tls_sec
->vma
;
2711 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2715 is_32bit_relative_branch (bfd_byte
*contents
, bfd_vma offset
)
2717 /* Opcode Instruction
2720 0x0f 0x8x conditional jump */
2722 && (contents
[offset
- 1] == 0xe8
2723 || contents
[offset
- 1] == 0xe9))
2725 && contents
[offset
- 2] == 0x0f
2726 && (contents
[offset
- 1] & 0xf0) == 0x80));
2729 /* Relocate an x86_64 ELF section. */
2732 elf_x86_64_relocate_section (bfd
*output_bfd
,
2733 struct bfd_link_info
*info
,
2735 asection
*input_section
,
2737 Elf_Internal_Rela
*relocs
,
2738 Elf_Internal_Sym
*local_syms
,
2739 asection
**local_sections
)
2741 struct elf_x86_64_link_hash_table
*htab
;
2742 Elf_Internal_Shdr
*symtab_hdr
;
2743 struct elf_link_hash_entry
**sym_hashes
;
2744 bfd_vma
*local_got_offsets
;
2745 bfd_vma
*local_tlsdesc_gotents
;
2746 Elf_Internal_Rela
*rel
;
2747 Elf_Internal_Rela
*relend
;
2749 BFD_ASSERT (is_x86_64_elf (input_bfd
));
2751 htab
= elf_x86_64_hash_table (info
);
2754 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2755 sym_hashes
= elf_sym_hashes (input_bfd
);
2756 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2757 local_tlsdesc_gotents
= elf_x86_64_local_tlsdesc_gotent (input_bfd
);
2759 elf_x86_64_set_tls_module_base (info
);
2762 relend
= relocs
+ input_section
->reloc_count
;
2763 for (; rel
< relend
; rel
++)
2765 unsigned int r_type
;
2766 reloc_howto_type
*howto
;
2767 unsigned long r_symndx
;
2768 struct elf_link_hash_entry
*h
;
2769 Elf_Internal_Sym
*sym
;
2771 bfd_vma off
, offplt
;
2773 bfd_boolean unresolved_reloc
;
2774 bfd_reloc_status_type r
;
2778 r_type
= ELF32_R_TYPE (rel
->r_info
);
2779 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2780 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2783 if (r_type
>= R_X86_64_max
)
2785 bfd_set_error (bfd_error_bad_value
);
2789 howto
= x86_64_elf_howto_table
+ r_type
;
2790 r_symndx
= htab
->r_sym (rel
->r_info
);
2794 unresolved_reloc
= FALSE
;
2795 if (r_symndx
< symtab_hdr
->sh_info
)
2797 sym
= local_syms
+ r_symndx
;
2798 sec
= local_sections
[r_symndx
];
2800 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2803 /* Relocate against local STT_GNU_IFUNC symbol. */
2804 if (!info
->relocatable
2805 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2807 h
= elf_x86_64_get_local_sym_hash (htab
, input_bfd
,
2812 /* Set STT_GNU_IFUNC symbol value. */
2813 h
->root
.u
.def
.value
= sym
->st_value
;
2814 h
->root
.u
.def
.section
= sec
;
2819 bfd_boolean warned ATTRIBUTE_UNUSED
;
2821 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2822 r_symndx
, symtab_hdr
, sym_hashes
,
2824 unresolved_reloc
, warned
);
2827 if (sec
!= NULL
&& elf_discarded_section (sec
))
2828 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2829 rel
, relend
, howto
, contents
);
2831 if (info
->relocatable
)
2834 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2835 it here if it is defined in a non-shared object. */
2837 && h
->type
== STT_GNU_IFUNC
2844 if ((input_section
->flags
& SEC_ALLOC
) == 0
2845 || h
->plt
.offset
== (bfd_vma
) -1)
2848 /* STT_GNU_IFUNC symbol must go through PLT. */
2849 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
2850 relocation
= (plt
->output_section
->vma
2851 + plt
->output_offset
+ h
->plt
.offset
);
2856 if (h
->root
.root
.string
)
2857 name
= h
->root
.root
.string
;
2859 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2861 (*_bfd_error_handler
)
2862 (_("%B: relocation %s against STT_GNU_IFUNC "
2863 "symbol `%s' isn't handled by %s"), input_bfd
,
2864 x86_64_elf_howto_table
[r_type
].name
,
2865 name
, __FUNCTION__
);
2866 bfd_set_error (bfd_error_bad_value
);
2875 if (ABI_64_P (output_bfd
))
2878 if (rel
->r_addend
!= 0)
2880 if (h
->root
.root
.string
)
2881 name
= h
->root
.root
.string
;
2883 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2885 (*_bfd_error_handler
)
2886 (_("%B: relocation %s against STT_GNU_IFUNC "
2887 "symbol `%s' has non-zero addend: %d"),
2888 input_bfd
, x86_64_elf_howto_table
[r_type
].name
,
2889 name
, rel
->r_addend
);
2890 bfd_set_error (bfd_error_bad_value
);
2894 /* Generate dynamic relcoation only when there is a
2895 non-GOF reference in a shared object. */
2896 if (info
->shared
&& h
->non_got_ref
)
2898 Elf_Internal_Rela outrel
;
2901 /* Need a dynamic relocation to get the real function
2903 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2907 if (outrel
.r_offset
== (bfd_vma
) -1
2908 || outrel
.r_offset
== (bfd_vma
) -2)
2911 outrel
.r_offset
+= (input_section
->output_section
->vma
2912 + input_section
->output_offset
);
2914 if (h
->dynindx
== -1
2916 || info
->executable
)
2918 /* This symbol is resolved locally. */
2919 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
2920 outrel
.r_addend
= (h
->root
.u
.def
.value
2921 + h
->root
.u
.def
.section
->output_section
->vma
2922 + h
->root
.u
.def
.section
->output_offset
);
2926 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
2927 outrel
.r_addend
= 0;
2930 sreloc
= htab
->elf
.irelifunc
;
2931 elf_append_rela (output_bfd
, sreloc
, &outrel
);
2933 /* If this reloc is against an external symbol, we
2934 do not want to fiddle with the addend. Otherwise,
2935 we need to include the symbol value so that it
2936 becomes an addend for the dynamic reloc. For an
2937 internal symbol, we have updated addend. */
2943 case R_X86_64_PLT32
:
2946 case R_X86_64_GOTPCREL
:
2947 case R_X86_64_GOTPCREL64
:
2948 base_got
= htab
->elf
.sgot
;
2949 off
= h
->got
.offset
;
2951 if (base_got
== NULL
)
2954 if (off
== (bfd_vma
) -1)
2956 /* We can't use h->got.offset here to save state, or
2957 even just remember the offset, as finish_dynamic_symbol
2958 would use that as offset into .got. */
2960 if (htab
->elf
.splt
!= NULL
)
2962 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2963 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2964 base_got
= htab
->elf
.sgotplt
;
2968 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
2969 off
= plt_index
* GOT_ENTRY_SIZE
;
2970 base_got
= htab
->elf
.igotplt
;
2973 if (h
->dynindx
== -1
2977 /* This references the local defitionion. We must
2978 initialize this entry in the global offset table.
2979 Since the offset must always be a multiple of 8,
2980 we use the least significant bit to record
2981 whether we have initialized it already.
2983 When doing a dynamic link, we create a .rela.got
2984 relocation entry to initialize the value. This
2985 is done in the finish_dynamic_symbol routine. */
2990 bfd_put_64 (output_bfd
, relocation
,
2991 base_got
->contents
+ off
);
2992 /* Note that this is harmless for the GOTPLT64
2993 case, as -1 | 1 still is -1. */
2999 relocation
= (base_got
->output_section
->vma
3000 + base_got
->output_offset
+ off
);
3002 if (r_type
!= R_X86_64_GOTPCREL
3003 && r_type
!= R_X86_64_GOTPCREL64
)
3006 if (htab
->elf
.splt
!= NULL
)
3007 gotplt
= htab
->elf
.sgotplt
;
3009 gotplt
= htab
->elf
.igotplt
;
3010 relocation
-= (gotplt
->output_section
->vma
3011 - gotplt
->output_offset
);
3018 /* When generating a shared object, the relocations handled here are
3019 copied into the output file to be resolved at run time. */
3022 case R_X86_64_GOT32
:
3023 case R_X86_64_GOT64
:
3024 /* Relocation is to the entry for this symbol in the global
3026 case R_X86_64_GOTPCREL
:
3027 case R_X86_64_GOTPCREL64
:
3028 /* Use global offset table entry as symbol value. */
3029 case R_X86_64_GOTPLT64
:
3030 /* This is the same as GOT64 for relocation purposes, but
3031 indicates the existence of a PLT entry. The difficulty is,
3032 that we must calculate the GOT slot offset from the PLT
3033 offset, if this symbol got a PLT entry (it was global).
3034 Additionally if it's computed from the PLT entry, then that
3035 GOT offset is relative to .got.plt, not to .got. */
3036 base_got
= htab
->elf
.sgot
;
3038 if (htab
->elf
.sgot
== NULL
)
3045 off
= h
->got
.offset
;
3047 && h
->plt
.offset
!= (bfd_vma
)-1
3048 && off
== (bfd_vma
)-1)
3050 /* We can't use h->got.offset here to save
3051 state, or even just remember the offset, as
3052 finish_dynamic_symbol would use that as offset into
3054 bfd_vma plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3055 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3056 base_got
= htab
->elf
.sgotplt
;
3059 dyn
= htab
->elf
.dynamic_sections_created
;
3061 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3063 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3064 || (ELF_ST_VISIBILITY (h
->other
)
3065 && h
->root
.type
== bfd_link_hash_undefweak
))
3067 /* This is actually a static link, or it is a -Bsymbolic
3068 link and the symbol is defined locally, or the symbol
3069 was forced to be local because of a version file. We
3070 must initialize this entry in the global offset table.
3071 Since the offset must always be a multiple of 8, we
3072 use the least significant bit to record whether we
3073 have initialized it already.
3075 When doing a dynamic link, we create a .rela.got
3076 relocation entry to initialize the value. This is
3077 done in the finish_dynamic_symbol routine. */
3082 bfd_put_64 (output_bfd
, relocation
,
3083 base_got
->contents
+ off
);
3084 /* Note that this is harmless for the GOTPLT64 case,
3085 as -1 | 1 still is -1. */
3090 unresolved_reloc
= FALSE
;
3094 if (local_got_offsets
== NULL
)
3097 off
= local_got_offsets
[r_symndx
];
3099 /* The offset must always be a multiple of 8. We use
3100 the least significant bit to record whether we have
3101 already generated the necessary reloc. */
3106 bfd_put_64 (output_bfd
, relocation
,
3107 base_got
->contents
+ off
);
3112 Elf_Internal_Rela outrel
;
3114 /* We need to generate a R_X86_64_RELATIVE reloc
3115 for the dynamic linker. */
3116 s
= htab
->elf
.srelgot
;
3120 outrel
.r_offset
= (base_got
->output_section
->vma
3121 + base_got
->output_offset
3123 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3124 outrel
.r_addend
= relocation
;
3125 elf_append_rela (output_bfd
, s
, &outrel
);
3128 local_got_offsets
[r_symndx
] |= 1;
3132 if (off
>= (bfd_vma
) -2)
3135 relocation
= base_got
->output_section
->vma
3136 + base_got
->output_offset
+ off
;
3137 if (r_type
!= R_X86_64_GOTPCREL
&& r_type
!= R_X86_64_GOTPCREL64
)
3138 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3139 - htab
->elf
.sgotplt
->output_offset
;
3143 case R_X86_64_GOTOFF64
:
3144 /* Relocation is relative to the start of the global offset
3147 /* Check to make sure it isn't a protected function symbol
3148 for shared library since it may not be local when used
3149 as function address. */
3153 && h
->type
== STT_FUNC
3154 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3156 (*_bfd_error_handler
)
3157 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3158 input_bfd
, h
->root
.root
.string
);
3159 bfd_set_error (bfd_error_bad_value
);
3163 /* Note that sgot is not involved in this
3164 calculation. We always want the start of .got.plt. If we
3165 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3166 permitted by the ABI, we might have to change this
3168 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3169 + htab
->elf
.sgotplt
->output_offset
;
3172 case R_X86_64_GOTPC32
:
3173 case R_X86_64_GOTPC64
:
3174 /* Use global offset table as symbol value. */
3175 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3176 + htab
->elf
.sgotplt
->output_offset
;
3177 unresolved_reloc
= FALSE
;
3180 case R_X86_64_PLTOFF64
:
3181 /* Relocation is PLT entry relative to GOT. For local
3182 symbols it's the symbol itself relative to GOT. */
3184 /* See PLT32 handling. */
3185 && h
->plt
.offset
!= (bfd_vma
) -1
3186 && htab
->elf
.splt
!= NULL
)
3188 relocation
= (htab
->elf
.splt
->output_section
->vma
3189 + htab
->elf
.splt
->output_offset
3191 unresolved_reloc
= FALSE
;
3194 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3195 + htab
->elf
.sgotplt
->output_offset
;
3198 case R_X86_64_PLT32
:
3199 /* Relocation is to the entry for this symbol in the
3200 procedure linkage table. */
3202 /* Resolve a PLT32 reloc against a local symbol directly,
3203 without using the procedure linkage table. */
3207 if (h
->plt
.offset
== (bfd_vma
) -1
3208 || htab
->elf
.splt
== NULL
)
3210 /* We didn't make a PLT entry for this symbol. This
3211 happens when statically linking PIC code, or when
3212 using -Bsymbolic. */
3216 relocation
= (htab
->elf
.splt
->output_section
->vma
3217 + htab
->elf
.splt
->output_offset
3219 unresolved_reloc
= FALSE
;
3226 && ABI_64_P (output_bfd
)
3227 && (input_section
->flags
& SEC_ALLOC
) != 0
3228 && (input_section
->flags
& SEC_READONLY
) != 0
3231 bfd_boolean fail
= FALSE
;
3233 = (r_type
== R_X86_64_PC32
3234 && is_32bit_relative_branch (contents
, rel
->r_offset
));
3236 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3238 /* Symbol is referenced locally. Make sure it is
3239 defined locally or for a branch. */
3240 fail
= !h
->def_regular
&& !branch
;
3244 /* Symbol isn't referenced locally. We only allow
3245 branch to symbol with non-default visibility. */
3247 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
);
3254 const char *pic
= "";
3256 switch (ELF_ST_VISIBILITY (h
->other
))
3259 v
= _("hidden symbol");
3262 v
= _("internal symbol");
3265 v
= _("protected symbol");
3269 pic
= _("; recompile with -fPIC");
3274 fmt
= _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3276 fmt
= _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3278 (*_bfd_error_handler
) (fmt
, input_bfd
,
3279 x86_64_elf_howto_table
[r_type
].name
,
3280 v
, h
->root
.root
.string
, pic
);
3281 bfd_set_error (bfd_error_bad_value
);
3292 /* FIXME: The ABI says the linker should make sure the value is
3293 the same when it's zeroextended to 64 bit. */
3295 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3300 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3301 || h
->root
.type
!= bfd_link_hash_undefweak
)
3302 && (! IS_X86_64_PCREL_TYPE (r_type
)
3303 || ! SYMBOL_CALLS_LOCAL (info
, h
)))
3304 || (ELIMINATE_COPY_RELOCS
3311 || h
->root
.type
== bfd_link_hash_undefweak
3312 || h
->root
.type
== bfd_link_hash_undefined
)))
3314 Elf_Internal_Rela outrel
;
3315 bfd_boolean skip
, relocate
;
3318 /* When generating a shared object, these relocations
3319 are copied into the output file to be resolved at run
3325 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3327 if (outrel
.r_offset
== (bfd_vma
) -1)
3329 else if (outrel
.r_offset
== (bfd_vma
) -2)
3330 skip
= TRUE
, relocate
= TRUE
;
3332 outrel
.r_offset
+= (input_section
->output_section
->vma
3333 + input_section
->output_offset
);
3336 memset (&outrel
, 0, sizeof outrel
);
3338 /* h->dynindx may be -1 if this symbol was marked to
3342 && (IS_X86_64_PCREL_TYPE (r_type
)
3344 || ! SYMBOLIC_BIND (info
, h
)
3345 || ! h
->def_regular
))
3347 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3348 outrel
.r_addend
= rel
->r_addend
;
3352 /* This symbol is local, or marked to become local. */
3353 if (r_type
== htab
->pointer_r_type
)
3356 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
3357 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3363 if (bfd_is_abs_section (sec
))
3365 else if (sec
== NULL
|| sec
->owner
== NULL
)
3367 bfd_set_error (bfd_error_bad_value
);
3374 /* We are turning this relocation into one
3375 against a section symbol. It would be
3376 proper to subtract the symbol's value,
3377 osec->vma, from the emitted reloc addend,
3378 but ld.so expects buggy relocs. */
3379 osec
= sec
->output_section
;
3380 sindx
= elf_section_data (osec
)->dynindx
;
3383 asection
*oi
= htab
->elf
.text_index_section
;
3384 sindx
= elf_section_data (oi
)->dynindx
;
3386 BFD_ASSERT (sindx
!= 0);
3389 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3390 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3394 sreloc
= elf_section_data (input_section
)->sreloc
;
3396 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
3398 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3400 /* If this reloc is against an external symbol, we do
3401 not want to fiddle with the addend. Otherwise, we
3402 need to include the symbol value so that it becomes
3403 an addend for the dynamic reloc. */
3410 case R_X86_64_TLSGD
:
3411 case R_X86_64_GOTPC32_TLSDESC
:
3412 case R_X86_64_TLSDESC_CALL
:
3413 case R_X86_64_GOTTPOFF
:
3414 tls_type
= GOT_UNKNOWN
;
3415 if (h
== NULL
&& local_got_offsets
)
3416 tls_type
= elf_x86_64_local_got_tls_type (input_bfd
) [r_symndx
];
3418 tls_type
= elf_x86_64_hash_entry (h
)->tls_type
;
3420 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3421 input_section
, contents
,
3422 symtab_hdr
, sym_hashes
,
3423 &r_type
, tls_type
, rel
,
3424 relend
, h
, r_symndx
))
3427 if (r_type
== R_X86_64_TPOFF32
)
3429 bfd_vma roff
= rel
->r_offset
;
3431 BFD_ASSERT (! unresolved_reloc
);
3433 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3435 /* GD->LE transition.
3436 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3437 .word 0x6666; rex64; call __tls_get_addr
3440 leaq foo@tpoff(%rax), %rax */
3441 memcpy (contents
+ roff
- 4,
3442 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3444 bfd_put_32 (output_bfd
,
3445 elf_x86_64_tpoff (info
, relocation
),
3446 contents
+ roff
+ 8);
3447 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3451 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3453 /* GDesc -> LE transition.
3454 It's originally something like:
3455 leaq x@tlsdesc(%rip), %rax
3458 movl $x@tpoff, %rax. */
3460 unsigned int val
, type
;
3462 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3463 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3464 bfd_put_8 (output_bfd
, 0x48 | ((type
>> 2) & 1),
3465 contents
+ roff
- 3);
3466 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3467 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3468 contents
+ roff
- 1);
3469 bfd_put_32 (output_bfd
,
3470 elf_x86_64_tpoff (info
, relocation
),
3474 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3476 /* GDesc -> LE transition.
3481 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3482 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3485 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTTPOFF
)
3487 /* IE->LE transition:
3488 Originally it can be one of:
3489 movq foo@gottpoff(%rip), %reg
3490 addq foo@gottpoff(%rip), %reg
3493 leaq foo(%reg), %reg
3496 unsigned int val
, type
, reg
;
3498 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3499 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3500 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3506 bfd_put_8 (output_bfd
, 0x49,
3507 contents
+ roff
- 3);
3508 bfd_put_8 (output_bfd
, 0xc7,
3509 contents
+ roff
- 2);
3510 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3511 contents
+ roff
- 1);
3515 /* addq -> addq - addressing with %rsp/%r12 is
3518 bfd_put_8 (output_bfd
, 0x49,
3519 contents
+ roff
- 3);
3520 bfd_put_8 (output_bfd
, 0x81,
3521 contents
+ roff
- 2);
3522 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3523 contents
+ roff
- 1);
3529 bfd_put_8 (output_bfd
, 0x4d,
3530 contents
+ roff
- 3);
3531 bfd_put_8 (output_bfd
, 0x8d,
3532 contents
+ roff
- 2);
3533 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3534 contents
+ roff
- 1);
3536 bfd_put_32 (output_bfd
,
3537 elf_x86_64_tpoff (info
, relocation
),
3545 if (htab
->elf
.sgot
== NULL
)
3550 off
= h
->got
.offset
;
3551 offplt
= elf_x86_64_hash_entry (h
)->tlsdesc_got
;
3555 if (local_got_offsets
== NULL
)
3558 off
= local_got_offsets
[r_symndx
];
3559 offplt
= local_tlsdesc_gotents
[r_symndx
];
3566 Elf_Internal_Rela outrel
;
3570 if (htab
->elf
.srelgot
== NULL
)
3573 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3575 if (GOT_TLS_GDESC_P (tls_type
))
3577 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3578 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3579 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3580 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3581 + htab
->elf
.sgotplt
->output_offset
3583 + htab
->sgotplt_jump_table_size
);
3584 sreloc
= htab
->elf
.srelplt
;
3586 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3588 outrel
.r_addend
= 0;
3589 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3592 sreloc
= htab
->elf
.srelgot
;
3594 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3595 + htab
->elf
.sgot
->output_offset
+ off
);
3597 if (GOT_TLS_GD_P (tls_type
))
3598 dr_type
= R_X86_64_DTPMOD64
;
3599 else if (GOT_TLS_GDESC_P (tls_type
))
3602 dr_type
= R_X86_64_TPOFF64
;
3604 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3605 outrel
.r_addend
= 0;
3606 if ((dr_type
== R_X86_64_TPOFF64
3607 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3608 outrel
.r_addend
= relocation
- elf_x86_64_dtpoff_base (info
);
3609 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
3611 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3613 if (GOT_TLS_GD_P (tls_type
))
3617 BFD_ASSERT (! unresolved_reloc
);
3618 bfd_put_64 (output_bfd
,
3619 relocation
- elf_x86_64_dtpoff_base (info
),
3620 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3624 bfd_put_64 (output_bfd
, 0,
3625 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3626 outrel
.r_info
= htab
->r_info (indx
,
3628 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3629 elf_append_rela (output_bfd
, sreloc
,
3638 local_got_offsets
[r_symndx
] |= 1;
3641 if (off
>= (bfd_vma
) -2
3642 && ! GOT_TLS_GDESC_P (tls_type
))
3644 if (r_type
== ELF32_R_TYPE (rel
->r_info
))
3646 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3647 || r_type
== R_X86_64_TLSDESC_CALL
)
3648 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3649 + htab
->elf
.sgotplt
->output_offset
3650 + offplt
+ htab
->sgotplt_jump_table_size
;
3652 relocation
= htab
->elf
.sgot
->output_section
->vma
3653 + htab
->elf
.sgot
->output_offset
+ off
;
3654 unresolved_reloc
= FALSE
;
3658 bfd_vma roff
= rel
->r_offset
;
3660 if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSGD
)
3662 /* GD->IE transition.
3663 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3664 .word 0x6666; rex64; call __tls_get_addr@plt
3667 addq foo@gottpoff(%rip), %rax */
3668 memcpy (contents
+ roff
- 4,
3669 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3672 relocation
= (htab
->elf
.sgot
->output_section
->vma
3673 + htab
->elf
.sgot
->output_offset
+ off
3675 - input_section
->output_section
->vma
3676 - input_section
->output_offset
3678 bfd_put_32 (output_bfd
, relocation
,
3679 contents
+ roff
+ 8);
3680 /* Skip R_X86_64_PLT32. */
3684 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_GOTPC32_TLSDESC
)
3686 /* GDesc -> IE transition.
3687 It's originally something like:
3688 leaq x@tlsdesc(%rip), %rax
3691 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3693 /* Now modify the instruction as appropriate. To
3694 turn a leaq into a movq in the form we use it, it
3695 suffices to change the second byte from 0x8d to
3697 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3699 bfd_put_32 (output_bfd
,
3700 htab
->elf
.sgot
->output_section
->vma
3701 + htab
->elf
.sgot
->output_offset
+ off
3703 - input_section
->output_section
->vma
3704 - input_section
->output_offset
3709 else if (ELF32_R_TYPE (rel
->r_info
) == R_X86_64_TLSDESC_CALL
)
3711 /* GDesc -> IE transition.
3718 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3719 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3727 case R_X86_64_TLSLD
:
3728 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3729 input_section
, contents
,
3730 symtab_hdr
, sym_hashes
,
3731 &r_type
, GOT_UNKNOWN
,
3732 rel
, relend
, h
, r_symndx
))
3735 if (r_type
!= R_X86_64_TLSLD
)
3737 /* LD->LE transition:
3738 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3740 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3742 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3743 memcpy (contents
+ rel
->r_offset
- 3,
3744 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3745 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3750 if (htab
->elf
.sgot
== NULL
)
3753 off
= htab
->tls_ld_got
.offset
;
3758 Elf_Internal_Rela outrel
;
3760 if (htab
->elf
.srelgot
== NULL
)
3763 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3764 + htab
->elf
.sgot
->output_offset
+ off
);
3766 bfd_put_64 (output_bfd
, 0,
3767 htab
->elf
.sgot
->contents
+ off
);
3768 bfd_put_64 (output_bfd
, 0,
3769 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3770 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
3771 outrel
.r_addend
= 0;
3772 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
3774 htab
->tls_ld_got
.offset
|= 1;
3776 relocation
= htab
->elf
.sgot
->output_section
->vma
3777 + htab
->elf
.sgot
->output_offset
+ off
;
3778 unresolved_reloc
= FALSE
;
3781 case R_X86_64_DTPOFF32
:
3782 if (!info
->executable
|| (input_section
->flags
& SEC_CODE
) == 0)
3783 relocation
-= elf_x86_64_dtpoff_base (info
);
3785 relocation
= elf_x86_64_tpoff (info
, relocation
);
3788 case R_X86_64_TPOFF32
:
3789 BFD_ASSERT (info
->executable
);
3790 relocation
= elf_x86_64_tpoff (info
, relocation
);
3797 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3798 because such sections are not SEC_ALLOC and thus ld.so will
3799 not process them. */
3800 if (unresolved_reloc
3801 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3803 (*_bfd_error_handler
)
3804 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3807 (long) rel
->r_offset
,
3809 h
->root
.root
.string
);
3812 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
3813 contents
, rel
->r_offset
,
3814 relocation
, rel
->r_addend
);
3816 if (r
!= bfd_reloc_ok
)
3821 name
= h
->root
.root
.string
;
3824 name
= bfd_elf_string_from_elf_section (input_bfd
,
3825 symtab_hdr
->sh_link
,
3830 name
= bfd_section_name (input_bfd
, sec
);
3833 if (r
== bfd_reloc_overflow
)
3835 if (! ((*info
->callbacks
->reloc_overflow
)
3836 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
3837 (bfd_vma
) 0, input_bfd
, input_section
,
3843 (*_bfd_error_handler
)
3844 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3845 input_bfd
, input_section
,
3846 (long) rel
->r_offset
, name
, (int) r
);
3855 /* Finish up dynamic symbol handling. We set the contents of various
3856 dynamic sections here. */
3859 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
3860 struct bfd_link_info
*info
,
3861 struct elf_link_hash_entry
*h
,
3862 Elf_Internal_Sym
*sym
)
3864 struct elf_x86_64_link_hash_table
*htab
;
3866 htab
= elf_x86_64_hash_table (info
);
3870 if (h
->plt
.offset
!= (bfd_vma
) -1)
3874 Elf_Internal_Rela rela
;
3876 asection
*plt
, *gotplt
, *relplt
;
3877 const struct elf_backend_data
*bed
;
3879 /* When building a static executable, use .iplt, .igot.plt and
3880 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3881 if (htab
->elf
.splt
!= NULL
)
3883 plt
= htab
->elf
.splt
;
3884 gotplt
= htab
->elf
.sgotplt
;
3885 relplt
= htab
->elf
.srelplt
;
3889 plt
= htab
->elf
.iplt
;
3890 gotplt
= htab
->elf
.igotplt
;
3891 relplt
= htab
->elf
.irelplt
;
3894 /* This symbol has an entry in the procedure linkage table. Set
3896 if ((h
->dynindx
== -1
3897 && !((h
->forced_local
|| info
->executable
)
3899 && h
->type
== STT_GNU_IFUNC
))
3905 /* Get the index in the procedure linkage table which
3906 corresponds to this symbol. This is the index of this symbol
3907 in all the symbols for which we are making plt entries. The
3908 first entry in the procedure linkage table is reserved.
3910 Get the offset into the .got table of the entry that
3911 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3912 bytes. The first three are reserved for the dynamic linker.
3914 For static executables, we don't reserve anything. */
3916 if (plt
== htab
->elf
.splt
)
3918 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3919 got_offset
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
3923 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3924 got_offset
= plt_index
* GOT_ENTRY_SIZE
;
3927 /* Fill in the entry in the procedure linkage table. */
3928 memcpy (plt
->contents
+ h
->plt
.offset
, elf_x86_64_plt_entry
,
3931 /* Insert the relocation positions of the plt section. The magic
3932 numbers at the end of the statements are the positions of the
3933 relocations in the plt section. */
3934 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3935 instruction uses 6 bytes, subtract this value. */
3936 bfd_put_32 (output_bfd
,
3937 (gotplt
->output_section
->vma
3938 + gotplt
->output_offset
3940 - plt
->output_section
->vma
3941 - plt
->output_offset
3944 plt
->contents
+ h
->plt
.offset
+ 2);
3946 /* Don't fill PLT entry for static executables. */
3947 if (plt
== htab
->elf
.splt
)
3949 /* Put relocation index. */
3950 bfd_put_32 (output_bfd
, plt_index
,
3951 plt
->contents
+ h
->plt
.offset
+ 7);
3952 /* Put offset for jmp .PLT0. */
3953 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
3954 plt
->contents
+ h
->plt
.offset
+ 12);
3957 /* Fill in the entry in the global offset table, initially this
3958 points to the pushq instruction in the PLT which is at offset 6. */
3959 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
3960 + plt
->output_offset
3961 + h
->plt
.offset
+ 6),
3962 gotplt
->contents
+ got_offset
);
3964 /* Fill in the entry in the .rela.plt section. */
3965 rela
.r_offset
= (gotplt
->output_section
->vma
3966 + gotplt
->output_offset
3968 if (h
->dynindx
== -1
3969 || ((info
->executable
3970 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
3972 && h
->type
== STT_GNU_IFUNC
))
3974 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3975 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3976 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
3977 rela
.r_addend
= (h
->root
.u
.def
.value
3978 + h
->root
.u
.def
.section
->output_section
->vma
3979 + h
->root
.u
.def
.section
->output_offset
);
3983 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
3987 bed
= get_elf_backend_data (output_bfd
);
3988 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
3989 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
3991 if (!h
->def_regular
)
3993 /* Mark the symbol as undefined, rather than as defined in
3994 the .plt section. Leave the value if there were any
3995 relocations where pointer equality matters (this is a clue
3996 for the dynamic linker, to make function pointer
3997 comparisons work between an application and shared
3998 library), otherwise set it to zero. If a function is only
3999 called from a binary, there is no need to slow down
4000 shared libraries because of that. */
4001 sym
->st_shndx
= SHN_UNDEF
;
4002 if (!h
->pointer_equality_needed
)
4007 if (h
->got
.offset
!= (bfd_vma
) -1
4008 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h
)->tls_type
)
4009 && elf_x86_64_hash_entry (h
)->tls_type
!= GOT_TLS_IE
)
4011 Elf_Internal_Rela rela
;
4013 /* This symbol has an entry in the global offset table. Set it
4015 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4018 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4019 + htab
->elf
.sgot
->output_offset
4020 + (h
->got
.offset
&~ (bfd_vma
) 1));
4022 /* If this is a static link, or it is a -Bsymbolic link and the
4023 symbol is defined locally or was forced to be local because
4024 of a version file, we just want to emit a RELATIVE reloc.
4025 The entry in the global offset table will already have been
4026 initialized in the relocate_section function. */
4028 && h
->type
== STT_GNU_IFUNC
)
4032 /* Generate R_X86_64_GLOB_DAT. */
4039 if (!h
->pointer_equality_needed
)
4042 /* For non-shared object, we can't use .got.plt, which
4043 contains the real function addres if we need pointer
4044 equality. We load the GOT entry with the PLT entry. */
4045 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4046 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4047 + plt
->output_offset
4049 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4053 else if (info
->shared
4054 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4056 if (!h
->def_regular
)
4058 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4059 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4060 rela
.r_addend
= (h
->root
.u
.def
.value
4061 + h
->root
.u
.def
.section
->output_section
->vma
4062 + h
->root
.u
.def
.section
->output_offset
);
4066 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4068 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4069 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4070 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4074 elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &rela
);
4079 Elf_Internal_Rela rela
;
4081 /* This symbol needs a copy reloc. Set it up. */
4083 if (h
->dynindx
== -1
4084 || (h
->root
.type
!= bfd_link_hash_defined
4085 && h
->root
.type
!= bfd_link_hash_defweak
)
4086 || htab
->srelbss
== NULL
)
4089 rela
.r_offset
= (h
->root
.u
.def
.value
4090 + h
->root
.u
.def
.section
->output_section
->vma
4091 + h
->root
.u
.def
.section
->output_offset
);
4092 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4094 elf_append_rela (output_bfd
, htab
->srelbss
, &rela
);
4097 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4098 be NULL for local symbols. */
4100 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4101 || h
== htab
->elf
.hgot
))
4102 sym
->st_shndx
= SHN_ABS
;
4107 /* Finish up local dynamic symbol handling. We set the contents of
4108 various dynamic sections here. */
4111 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4113 struct elf_link_hash_entry
*h
4114 = (struct elf_link_hash_entry
*) *slot
;
4115 struct bfd_link_info
*info
4116 = (struct bfd_link_info
*) inf
;
4118 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4122 /* Used to decide how to sort relocs in an optimal manner for the
4123 dynamic linker, before writing them out. */
4125 static enum elf_reloc_type_class
4126 elf_x86_64_reloc_type_class (const Elf_Internal_Rela
*rela
)
4128 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4130 case R_X86_64_RELATIVE
:
4131 return reloc_class_relative
;
4132 case R_X86_64_JUMP_SLOT
:
4133 return reloc_class_plt
;
4135 return reloc_class_copy
;
4137 return reloc_class_normal
;
4141 /* Finish up the dynamic sections. */
4144 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4145 struct bfd_link_info
*info
)
4147 struct elf_x86_64_link_hash_table
*htab
;
4151 htab
= elf_x86_64_hash_table (info
);
4155 dynobj
= htab
->elf
.dynobj
;
4156 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4158 if (htab
->elf
.dynamic_sections_created
)
4160 bfd_byte
*dyncon
, *dynconend
;
4161 const struct elf_backend_data
*bed
;
4162 bfd_size_type sizeof_dyn
;
4164 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
4167 bed
= get_elf_backend_data (dynobj
);
4168 sizeof_dyn
= bed
->s
->sizeof_dyn
;
4169 dyncon
= sdyn
->contents
;
4170 dynconend
= sdyn
->contents
+ sdyn
->size
;
4171 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
4173 Elf_Internal_Dyn dyn
;
4176 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
4184 s
= htab
->elf
.sgotplt
;
4185 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4189 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
4193 s
= htab
->elf
.srelplt
->output_section
;
4194 dyn
.d_un
.d_val
= s
->size
;
4198 /* The procedure linkage table relocs (DT_JMPREL) should
4199 not be included in the overall relocs (DT_RELA).
4200 Therefore, we override the DT_RELASZ entry here to
4201 make it not include the JMPREL relocs. Since the
4202 linker script arranges for .rela.plt to follow all
4203 other relocation sections, we don't have to worry
4204 about changing the DT_RELA entry. */
4205 if (htab
->elf
.srelplt
!= NULL
)
4207 s
= htab
->elf
.srelplt
->output_section
;
4208 dyn
.d_un
.d_val
-= s
->size
;
4212 case DT_TLSDESC_PLT
:
4214 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4215 + htab
->tlsdesc_plt
;
4218 case DT_TLSDESC_GOT
:
4220 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
4221 + htab
->tlsdesc_got
;
4225 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
4228 /* Fill in the special first entry in the procedure linkage table. */
4229 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4231 /* Fill in the first entry in the procedure linkage table. */
4232 memcpy (htab
->elf
.splt
->contents
, elf_x86_64_plt0_entry
,
4234 /* Add offset for pushq GOT+8(%rip), since the instruction
4235 uses 6 bytes subtract this value. */
4236 bfd_put_32 (output_bfd
,
4237 (htab
->elf
.sgotplt
->output_section
->vma
4238 + htab
->elf
.sgotplt
->output_offset
4240 - htab
->elf
.splt
->output_section
->vma
4241 - htab
->elf
.splt
->output_offset
4243 htab
->elf
.splt
->contents
+ 2);
4244 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4245 the end of the instruction. */
4246 bfd_put_32 (output_bfd
,
4247 (htab
->elf
.sgotplt
->output_section
->vma
4248 + htab
->elf
.sgotplt
->output_offset
4250 - htab
->elf
.splt
->output_section
->vma
4251 - htab
->elf
.splt
->output_offset
4253 htab
->elf
.splt
->contents
+ 8);
4255 elf_section_data (htab
->elf
.splt
->output_section
)->this_hdr
.sh_entsize
=
4258 if (htab
->tlsdesc_plt
)
4260 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4261 htab
->elf
.sgot
->contents
+ htab
->tlsdesc_got
);
4263 memcpy (htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
,
4264 elf_x86_64_plt0_entry
,
4267 /* Add offset for pushq GOT+8(%rip), since the
4268 instruction uses 6 bytes subtract this value. */
4269 bfd_put_32 (output_bfd
,
4270 (htab
->elf
.sgotplt
->output_section
->vma
4271 + htab
->elf
.sgotplt
->output_offset
4273 - htab
->elf
.splt
->output_section
->vma
4274 - htab
->elf
.splt
->output_offset
4277 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 2);
4278 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4279 htab->tlsdesc_got. The 12 is the offset to the end of
4281 bfd_put_32 (output_bfd
,
4282 (htab
->elf
.sgot
->output_section
->vma
4283 + htab
->elf
.sgot
->output_offset
4285 - htab
->elf
.splt
->output_section
->vma
4286 - htab
->elf
.splt
->output_offset
4289 htab
->elf
.splt
->contents
+ htab
->tlsdesc_plt
+ 8);
4294 if (htab
->elf
.sgotplt
)
4296 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
4298 (*_bfd_error_handler
)
4299 (_("discarded output section: `%A'"), htab
->elf
.sgotplt
);
4303 /* Fill in the first three entries in the global offset table. */
4304 if (htab
->elf
.sgotplt
->size
> 0)
4306 /* Set the first entry in the global offset table to the address of
4307 the dynamic section. */
4309 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
);
4311 bfd_put_64 (output_bfd
,
4312 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4313 htab
->elf
.sgotplt
->contents
);
4314 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4315 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
4316 bfd_put_64 (output_bfd
, (bfd_vma
) 0, htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
*2);
4319 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
=
4323 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
4324 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
4327 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4328 htab_traverse (htab
->loc_hash_table
,
4329 elf_x86_64_finish_local_dynamic_symbol
,
4335 /* Return address for Ith PLT stub in section PLT, for relocation REL
4336 or (bfd_vma) -1 if it should not be included. */
4339 elf_x86_64_plt_sym_val (bfd_vma i
, const asection
*plt
,
4340 const arelent
*rel ATTRIBUTE_UNUSED
)
4342 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4345 /* Handle an x86-64 specific section when reading an object file. This
4346 is called when elfcode.h finds a section with an unknown type. */
4349 elf_x86_64_section_from_shdr (bfd
*abfd
,
4350 Elf_Internal_Shdr
*hdr
,
4354 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
4357 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
4363 /* Hook called by the linker routine which adds symbols from an object
4364 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4368 elf_x86_64_add_symbol_hook (bfd
*abfd
,
4369 struct bfd_link_info
*info
,
4370 Elf_Internal_Sym
*sym
,
4371 const char **namep ATTRIBUTE_UNUSED
,
4372 flagword
*flagsp ATTRIBUTE_UNUSED
,
4378 switch (sym
->st_shndx
)
4380 case SHN_X86_64_LCOMMON
:
4381 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
4384 lcomm
= bfd_make_section_with_flags (abfd
,
4388 | SEC_LINKER_CREATED
));
4391 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
4394 *valp
= sym
->st_size
;
4398 if ((abfd
->flags
& DYNAMIC
) == 0
4399 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4400 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4406 /* Given a BFD section, try to locate the corresponding ELF section
4410 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
4411 asection
*sec
, int *index_return
)
4413 if (sec
== &_bfd_elf_large_com_section
)
4415 *index_return
= SHN_X86_64_LCOMMON
;
4421 /* Process a symbol. */
4424 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
4427 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
4429 switch (elfsym
->internal_elf_sym
.st_shndx
)
4431 case SHN_X86_64_LCOMMON
:
4432 asym
->section
= &_bfd_elf_large_com_section
;
4433 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
4434 /* Common symbol doesn't set BSF_GLOBAL. */
4435 asym
->flags
&= ~BSF_GLOBAL
;
4441 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
4443 return (sym
->st_shndx
== SHN_COMMON
4444 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
4448 elf_x86_64_common_section_index (asection
*sec
)
4450 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4453 return SHN_X86_64_LCOMMON
;
4457 elf_x86_64_common_section (asection
*sec
)
4459 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
4460 return bfd_com_section_ptr
;
4462 return &_bfd_elf_large_com_section
;
4466 elf_x86_64_merge_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
4467 struct elf_link_hash_entry
**sym_hash ATTRIBUTE_UNUSED
,
4468 struct elf_link_hash_entry
*h
,
4469 Elf_Internal_Sym
*sym
,
4471 bfd_vma
*pvalue ATTRIBUTE_UNUSED
,
4472 unsigned int *pold_alignment ATTRIBUTE_UNUSED
,
4473 bfd_boolean
*skip ATTRIBUTE_UNUSED
,
4474 bfd_boolean
*override ATTRIBUTE_UNUSED
,
4475 bfd_boolean
*type_change_ok ATTRIBUTE_UNUSED
,
4476 bfd_boolean
*size_change_ok ATTRIBUTE_UNUSED
,
4477 bfd_boolean
*newdef ATTRIBUTE_UNUSED
,
4478 bfd_boolean
*newdyn
,
4479 bfd_boolean
*newdyncommon ATTRIBUTE_UNUSED
,
4480 bfd_boolean
*newweak ATTRIBUTE_UNUSED
,
4481 bfd
*abfd ATTRIBUTE_UNUSED
,
4483 bfd_boolean
*olddef ATTRIBUTE_UNUSED
,
4484 bfd_boolean
*olddyn
,
4485 bfd_boolean
*olddyncommon ATTRIBUTE_UNUSED
,
4486 bfd_boolean
*oldweak ATTRIBUTE_UNUSED
,
4490 /* A normal common symbol and a large common symbol result in a
4491 normal common symbol. We turn the large common symbol into a
4494 && h
->root
.type
== bfd_link_hash_common
4496 && bfd_is_com_section (*sec
)
4499 if (sym
->st_shndx
== SHN_COMMON
4500 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) != 0)
4502 h
->root
.u
.c
.p
->section
4503 = bfd_make_section_old_way (oldbfd
, "COMMON");
4504 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
4506 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
4507 && (elf_section_flags (*oldsec
) & SHF_X86_64_LARGE
) == 0)
4508 *psec
= *sec
= bfd_com_section_ptr
;
4515 elf_x86_64_additional_program_headers (bfd
*abfd
,
4516 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
4521 /* Check to see if we need a large readonly segment. */
4522 s
= bfd_get_section_by_name (abfd
, ".lrodata");
4523 if (s
&& (s
->flags
& SEC_LOAD
))
4526 /* Check to see if we need a large data segment. Since .lbss sections
4527 is placed right after the .bss section, there should be no need for
4528 a large data segment just because of .lbss. */
4529 s
= bfd_get_section_by_name (abfd
, ".ldata");
4530 if (s
&& (s
->flags
& SEC_LOAD
))
4536 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4539 elf_x86_64_hash_symbol (struct elf_link_hash_entry
*h
)
4541 if (h
->plt
.offset
!= (bfd_vma
) -1
4543 && !h
->pointer_equality_needed
)
4546 return _bfd_elf_hash_symbol (h
);
4549 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4552 elf_x86_64_relocs_compatible (const bfd_target
*input
,
4553 const bfd_target
*output
)
4555 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
4556 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
4557 && _bfd_elf_relocs_compatible (input
, output
));
4560 static const struct bfd_elf_special_section
4561 elf_x86_64_special_sections
[]=
4563 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4564 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4565 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
4566 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4567 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
4568 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
4569 { NULL
, 0, 0, 0, 0 }
4572 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4573 #define TARGET_LITTLE_NAME "elf64-x86-64"
4574 #define ELF_ARCH bfd_arch_i386
4575 #define ELF_TARGET_ID X86_64_ELF_DATA
4576 #define ELF_MACHINE_CODE EM_X86_64
4577 #define ELF_MAXPAGESIZE 0x200000
4578 #define ELF_MINPAGESIZE 0x1000
4579 #define ELF_COMMONPAGESIZE 0x1000
4581 #define elf_backend_can_gc_sections 1
4582 #define elf_backend_can_refcount 1
4583 #define elf_backend_want_got_plt 1
4584 #define elf_backend_plt_readonly 1
4585 #define elf_backend_want_plt_sym 0
4586 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4587 #define elf_backend_rela_normal 1
4589 #define elf_info_to_howto elf_x86_64_info_to_howto
4591 #define bfd_elf64_bfd_link_hash_table_create \
4592 elf_x86_64_link_hash_table_create
4593 #define bfd_elf64_bfd_link_hash_table_free \
4594 elf_x86_64_link_hash_table_free
4595 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
4596 #define bfd_elf64_bfd_reloc_name_lookup \
4597 elf_x86_64_reloc_name_lookup
4599 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
4600 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
4601 #define elf_backend_check_relocs elf_x86_64_check_relocs
4602 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
4603 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
4604 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
4605 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
4606 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
4607 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
4608 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
4609 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
4610 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
4611 #define elf_backend_relocate_section elf_x86_64_relocate_section
4612 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
4613 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
4614 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4615 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
4616 #define elf_backend_object_p elf64_x86_64_elf_object_p
4617 #define bfd_elf64_mkobject elf_x86_64_mkobject
4619 #define elf_backend_section_from_shdr \
4620 elf_x86_64_section_from_shdr
4622 #define elf_backend_section_from_bfd_section \
4623 elf_x86_64_elf_section_from_bfd_section
4624 #define elf_backend_add_symbol_hook \
4625 elf_x86_64_add_symbol_hook
4626 #define elf_backend_symbol_processing \
4627 elf_x86_64_symbol_processing
4628 #define elf_backend_common_section_index \
4629 elf_x86_64_common_section_index
4630 #define elf_backend_common_section \
4631 elf_x86_64_common_section
4632 #define elf_backend_common_definition \
4633 elf_x86_64_common_definition
4634 #define elf_backend_merge_symbol \
4635 elf_x86_64_merge_symbol
4636 #define elf_backend_special_sections \
4637 elf_x86_64_special_sections
4638 #define elf_backend_additional_program_headers \
4639 elf_x86_64_additional_program_headers
4640 #define elf_backend_hash_symbol \
4641 elf_x86_64_hash_symbol
4643 #undef elf_backend_post_process_headers
4644 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4646 #include "elf64-target.h"
4648 /* FreeBSD support. */
4650 #undef TARGET_LITTLE_SYM
4651 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4652 #undef TARGET_LITTLE_NAME
4653 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4656 #define ELF_OSABI ELFOSABI_FREEBSD
4659 #define elf64_bed elf64_x86_64_fbsd_bed
4661 #include "elf64-target.h"
4663 /* Solaris 2 support. */
4665 #undef TARGET_LITTLE_SYM
4666 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4667 #undef TARGET_LITTLE_NAME
4668 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4670 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4671 objects won't be recognized. */
4675 #define elf64_bed elf64_x86_64_sol2_bed
4677 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
4679 #undef elf_backend_static_tls_alignment
4680 #define elf_backend_static_tls_alignment 16
4682 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4684 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4686 #undef elf_backend_want_plt_sym
4687 #define elf_backend_want_plt_sym 1
4689 #include "elf64-target.h"
4691 /* Intel L1OM support. */
4694 elf64_l1om_elf_object_p (bfd
*abfd
)
4696 /* Set the right machine number for an L1OM elf64 file. */
4697 bfd_default_set_arch_mach (abfd
, bfd_arch_l1om
, bfd_mach_l1om
);
4701 #undef TARGET_LITTLE_SYM
4702 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4703 #undef TARGET_LITTLE_NAME
4704 #define TARGET_LITTLE_NAME "elf64-l1om"
4706 #define ELF_ARCH bfd_arch_l1om
4708 #undef ELF_MACHINE_CODE
4709 #define ELF_MACHINE_CODE EM_L1OM
4714 #define elf64_bed elf64_l1om_bed
4716 #undef elf_backend_object_p
4717 #define elf_backend_object_p elf64_l1om_elf_object_p
4719 #undef elf_backend_post_process_headers
4720 #undef elf_backend_static_tls_alignment
4722 #include "elf64-target.h"
4724 /* FreeBSD L1OM support. */
4726 #undef TARGET_LITTLE_SYM
4727 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4728 #undef TARGET_LITTLE_NAME
4729 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4732 #define ELF_OSABI ELFOSABI_FREEBSD
4735 #define elf64_bed elf64_l1om_fbsd_bed
4737 #undef elf_backend_post_process_headers
4738 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4740 #include "elf64-target.h"
4742 /* 32bit x86-64 support. */
4745 elf32_x86_64_elf_object_p (bfd
*abfd
)
4747 /* Set the right machine number for an x86-64 elf32 file. */
4748 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
4752 #undef TARGET_LITTLE_SYM
4753 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
4754 #undef TARGET_LITTLE_NAME
4755 #define TARGET_LITTLE_NAME "elf32-x86-64"
4758 #define ELF_ARCH bfd_arch_i386
4760 #undef ELF_MACHINE_CODE
4761 #define ELF_MACHINE_CODE EM_X86_64
4763 #define bfd_elf32_bfd_link_hash_table_create \
4764 elf_x86_64_link_hash_table_create
4765 #define bfd_elf32_bfd_link_hash_table_free \
4766 elf_x86_64_link_hash_table_free
4767 #define bfd_elf32_bfd_reloc_type_lookup \
4768 elf_x86_64_reloc_type_lookup
4769 #define bfd_elf32_bfd_reloc_name_lookup \
4770 elf_x86_64_reloc_name_lookup
4771 #define bfd_elf32_mkobject \
4776 #undef elf_backend_post_process_headers
4778 #undef elf_backend_object_p
4779 #define elf_backend_object_p \
4780 elf32_x86_64_elf_object_p
4782 #undef elf_backend_bfd_from_remote_memory
4783 #define elf_backend_bfd_from_remote_memory \
4784 _bfd_elf32_bfd_from_remote_memory
4786 #undef elf_backend_size_info
4787 #define elf_backend_size_info \
4788 _bfd_elf32_size_info
4790 #include "elf32-target.h"