1 /* X86-64 specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Jan Hubicka <jh@suse.cz>.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
28 #include "bfd_stdint.h"
32 #include "elf/x86-64.h"
34 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
35 #define MINUS_ONE (~ (bfd_vma) 0)
37 /* The relocation "howto" table. Order of fields:
38 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
39 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
40 static reloc_howto_type x86_64_elf_howto_table[] =
42 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
43 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
45 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
48 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
49 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
51 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
52 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
54 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
55 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
57 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
60 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
63 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
66 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
69 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
70 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
72 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
73 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
75 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
76 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
78 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
80 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
82 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
84 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
85 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
86 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
89 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
92 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
95 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
96 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
98 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
99 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
101 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
102 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
104 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
107 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
108 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
110 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
113 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
115 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
116 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
117 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
118 FALSE, 0xffffffff, 0xffffffff, TRUE),
119 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
120 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
122 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
125 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
126 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
127 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
128 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
129 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
131 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
136 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
137 complain_overflow_bitfield, bfd_elf_generic_reloc,
138 "R_X86_64_GOTPC32_TLSDESC",
139 FALSE, 0xffffffff, 0xffffffff, TRUE),
140 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
141 complain_overflow_dont, bfd_elf_generic_reloc,
142 "R_X86_64_TLSDESC_CALL",
144 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
145 complain_overflow_bitfield, bfd_elf_generic_reloc,
147 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
148 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
152 /* We have a gap in the reloc numbers here.
153 R_X86_64_standard counts the number up to this point, and
154 R_X86_64_vt_offset is the value to subtract from a reloc type of
155 R_X86_64_GNU_VT* to form an index into this table. */
156 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
157 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
159 /* GNU extension to record C++ vtable hierarchy. */
160 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
161 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
163 /* GNU extension to record C++ vtable member usage. */
164 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
165 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
169 #define IS_X86_64_PCREL_TYPE(TYPE) \
170 ( ((TYPE) == R_X86_64_PC8) \
171 || ((TYPE) == R_X86_64_PC16) \
172 || ((TYPE) == R_X86_64_PC32) \
173 || ((TYPE) == R_X86_64_PC64))
175 /* Map BFD relocs to the x86_64 elf relocs. */
178 bfd_reloc_code_real_type bfd_reloc_val;
179 unsigned char elf_reloc_val;
182 static const struct elf_reloc_map x86_64_reloc_map[] =
184 { BFD_RELOC_NONE, R_X86_64_NONE, },
185 { BFD_RELOC_64, R_X86_64_64, },
186 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
187 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
188 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
189 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
190 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
191 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
192 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
193 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
194 { BFD_RELOC_32, R_X86_64_32, },
195 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
196 { BFD_RELOC_16, R_X86_64_16, },
197 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
198 { BFD_RELOC_8, R_X86_64_8, },
199 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
200 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
201 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
202 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
203 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
204 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
205 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
206 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
207 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
208 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
209 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
210 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
211 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
212 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
213 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
214 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
215 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
216 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
217 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
218 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
219 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
220 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
221 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
224 static reloc_howto_type *
225 elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
229 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
230 || r_type >= (unsigned int) R_X86_64_max)
232 if (r_type >= (unsigned int) R_X86_64_standard)
234 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
236 r_type = R_X86_64_NONE;
241 i = r_type - (unsigned int) R_X86_64_vt_offset;
242 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
243 return &x86_64_elf_howto_table[i];
246 /* Given a BFD reloc type, return a HOWTO structure. */
247 static reloc_howto_type *
248 elf64_x86_64_reloc_type_lookup (bfd *abfd,
249 bfd_reloc_code_real_type code)
253 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
256 if (x86_64_reloc_map[i].bfd_reloc_val == code)
257 return elf64_x86_64_rtype_to_howto (abfd,
258 x86_64_reloc_map[i].elf_reloc_val);
263 static reloc_howto_type *
264 elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
270 i < (sizeof (x86_64_elf_howto_table)
271 / sizeof (x86_64_elf_howto_table[0]));
273 if (x86_64_elf_howto_table[i].name != NULL
274 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
275 return &x86_64_elf_howto_table[i];
280 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
283 elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
284 Elf_Internal_Rela *dst)
288 r_type = ELF64_R_TYPE (dst->r_info);
289 cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type);
290 BFD_ASSERT (r_type == cache_ptr->howto->type);
293 /* Support for core dump NOTE sections. */
295 elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
300 switch (note->descsz)
305 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
307 elf_tdata (abfd)->core_signal
308 = bfd_get_16 (abfd, note->descdata + 12);
311 elf_tdata (abfd)->core_pid
312 = bfd_get_32 (abfd, note->descdata + 32);
321 /* Make a ".reg/999" section. */
322 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
323 size, note->descpos + offset);
327 elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
329 switch (note->descsz)
334 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
335 elf_tdata (abfd)->core_program
336 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
337 elf_tdata (abfd)->core_command
338 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
341 /* Note that for some reason, a spurious space is tacked
342 onto the end of the args in some (at least one anyway)
343 implementations, so strip it off if it exists. */
346 char *command = elf_tdata (abfd)->core_command;
347 int n = strlen (command);
349 if (0 < n && command[n - 1] == ' ')
350 command[n - 1] = '\0';
356 /* Functions for the x86-64 ELF linker. */
358 /* The name of the dynamic interpreter. This is put in the .interp
361 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
363 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
364 copying dynamic variables from a shared lib into an app's dynbss
365 section, and instead use a dynamic relocation to point into the
367 #define ELIMINATE_COPY_RELOCS 1
369 /* The size in bytes of an entry in the global offset table. */
371 #define GOT_ENTRY_SIZE 8
373 /* The size in bytes of an entry in the procedure linkage table. */
375 #define PLT_ENTRY_SIZE 16
377 /* The first entry in a procedure linkage table looks like this. See the
378 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
380 static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
382 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
383 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
384 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
387 /* Subsequent entries in a procedure linkage table look like this. */
389 static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
391 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
392 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
393 0x68, /* pushq immediate */
394 0, 0, 0, 0, /* replaced with index into relocation table. */
395 0xe9, /* jmp relative */
396 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
399 /* x86-64 ELF linker hash entry. */
401 struct elf64_x86_64_link_hash_entry
403 struct elf_link_hash_entry elf;
405 /* Track dynamic relocs copied for this symbol. */
406 struct elf_dyn_relocs *dyn_relocs;
408 #define GOT_UNKNOWN 0
412 #define GOT_TLS_GDESC 4
413 #define GOT_TLS_GD_BOTH_P(type) \
414 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
415 #define GOT_TLS_GD_P(type) \
416 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
417 #define GOT_TLS_GDESC_P(type) \
418 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
419 #define GOT_TLS_GD_ANY_P(type) \
420 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
421 unsigned char tls_type;
423 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
424 starting at the end of the jump table. */
428 #define elf64_x86_64_hash_entry(ent) \
429 ((struct elf64_x86_64_link_hash_entry *)(ent))
431 struct elf64_x86_64_obj_tdata
433 struct elf_obj_tdata root;
435 /* tls_type for each local got entry. */
436 char *local_got_tls_type;
438 /* GOTPLT entries for TLS descriptors. */
439 bfd_vma *local_tlsdesc_gotent;
442 #define elf64_x86_64_tdata(abfd) \
443 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
445 #define elf64_x86_64_local_got_tls_type(abfd) \
446 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
448 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
449 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
451 #define is_x86_64_elf(bfd) \
452 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
453 && elf_tdata (bfd) != NULL \
454 && elf_object_id (bfd) == X86_64_ELF_TDATA)
457 elf64_x86_64_mkobject (bfd *abfd)
459 return bfd_elf_allocate_object (abfd, sizeof (struct elf64_x86_64_obj_tdata),
463 /* x86-64 ELF linker hash table. */
465 struct elf64_x86_64_link_hash_table
467 struct elf_link_hash_table elf;
469 /* Short-cuts to get to dynamic linker sections. */
473 /* The offset into splt of the PLT entry for the TLS descriptor
474 resolver. Special values are 0, if not necessary (or not found
475 to be necessary yet), and -1 if needed but not determined
478 /* The offset into sgot of the GOT entry used by the PLT entry
483 bfd_signed_vma refcount;
487 /* The amount of space used by the jump slots in the GOT. */
488 bfd_vma sgotplt_jump_table_size;
490 /* Small local sym cache. */
491 struct sym_cache sym_cache;
493 /* _TLS_MODULE_BASE_ symbol. */
494 struct bfd_link_hash_entry *tls_module_base;
496 /* Used by local STT_GNU_IFUNC symbols. */
497 htab_t loc_hash_table;
498 void *loc_hash_memory;
501 /* Get the x86-64 ELF linker hash table from a link_info structure. */
503 #define elf64_x86_64_hash_table(p) \
504 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
506 #define elf64_x86_64_compute_jump_table_size(htab) \
507 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
509 /* Create an entry in an x86-64 ELF linker hash table. */
511 static struct bfd_hash_entry *
512 elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
513 struct bfd_hash_table *table,
516 /* Allocate the structure if it has not already been allocated by a
520 entry = bfd_hash_allocate (table,
521 sizeof (struct elf64_x86_64_link_hash_entry));
526 /* Call the allocation method of the superclass. */
527 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
530 struct elf64_x86_64_link_hash_entry *eh;
532 eh = (struct elf64_x86_64_link_hash_entry *) entry;
533 eh->dyn_relocs = NULL;
534 eh->tls_type = GOT_UNKNOWN;
535 eh->tlsdesc_got = (bfd_vma) -1;
541 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
542 for local symbol so that we can handle local STT_GNU_IFUNC symbols
543 as global symbol. We reuse indx and dynstr_index for local symbol
544 hash since they aren't used by global symbols in this backend. */
547 elf64_x86_64_local_htab_hash (const void *ptr)
549 struct elf_link_hash_entry *h
550 = (struct elf_link_hash_entry *) ptr;
551 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
554 /* Compare local hash entries. */
557 elf64_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
559 struct elf_link_hash_entry *h1
560 = (struct elf_link_hash_entry *) ptr1;
561 struct elf_link_hash_entry *h2
562 = (struct elf_link_hash_entry *) ptr2;
564 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
567 /* Find and/or create a hash entry for local symbol. */
569 static struct elf_link_hash_entry *
570 elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table *htab,
571 bfd *abfd, const Elf_Internal_Rela *rel,
574 struct elf64_x86_64_link_hash_entry e, *ret;
575 asection *sec = abfd->sections;
576 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
577 ELF64_R_SYM (rel->r_info));
580 e.elf.indx = sec->id;
581 e.elf.dynstr_index = ELF64_R_SYM (rel->r_info);
582 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
583 create ? INSERT : NO_INSERT);
590 ret = (struct elf64_x86_64_link_hash_entry *) *slot;
594 ret = (struct elf64_x86_64_link_hash_entry *)
595 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
596 sizeof (struct elf64_x86_64_link_hash_entry));
599 memset (ret, 0, sizeof (*ret));
600 ret->elf.indx = sec->id;
601 ret->elf.dynstr_index = ELF64_R_SYM (rel->r_info);
602 ret->elf.dynindx = -1;
603 ret->elf.plt.offset = (bfd_vma) -1;
604 ret->elf.got.offset = (bfd_vma) -1;
610 /* Create an X86-64 ELF linker hash table. */
612 static struct bfd_link_hash_table *
613 elf64_x86_64_link_hash_table_create (bfd *abfd)
615 struct elf64_x86_64_link_hash_table *ret;
616 bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
618 ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
622 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
623 elf64_x86_64_link_hash_newfunc,
624 sizeof (struct elf64_x86_64_link_hash_entry)))
632 ret->sym_cache.abfd = NULL;
633 ret->tlsdesc_plt = 0;
634 ret->tlsdesc_got = 0;
635 ret->tls_ld_got.refcount = 0;
636 ret->sgotplt_jump_table_size = 0;
637 ret->tls_module_base = NULL;
639 ret->loc_hash_table = htab_try_create (1024,
640 elf64_x86_64_local_htab_hash,
641 elf64_x86_64_local_htab_eq,
643 ret->loc_hash_memory = objalloc_create ();
644 if (!ret->loc_hash_table || !ret->loc_hash_memory)
650 return &ret->elf.root;
653 /* Destroy an X86-64 ELF linker hash table. */
656 elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
658 struct elf64_x86_64_link_hash_table *htab
659 = (struct elf64_x86_64_link_hash_table *) hash;
661 if (htab->loc_hash_table)
662 htab_delete (htab->loc_hash_table);
663 if (htab->loc_hash_memory)
664 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
665 _bfd_generic_link_hash_table_free (hash);
668 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
669 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
673 elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
675 struct elf64_x86_64_link_hash_table *htab;
677 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
680 htab = elf64_x86_64_hash_table (info);
681 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
683 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
686 || (!info->shared && !htab->srelbss))
692 /* Copy the extra info we tack onto an elf_link_hash_entry. */
695 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
696 struct elf_link_hash_entry *dir,
697 struct elf_link_hash_entry *ind)
699 struct elf64_x86_64_link_hash_entry *edir, *eind;
701 edir = (struct elf64_x86_64_link_hash_entry *) dir;
702 eind = (struct elf64_x86_64_link_hash_entry *) ind;
704 if (eind->dyn_relocs != NULL)
706 if (edir->dyn_relocs != NULL)
708 struct elf_dyn_relocs **pp;
709 struct elf_dyn_relocs *p;
711 /* Add reloc counts against the indirect sym to the direct sym
712 list. Merge any entries against the same section. */
713 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
715 struct elf_dyn_relocs *q;
717 for (q = edir->dyn_relocs; q != NULL; q = q->next)
718 if (q->sec == p->sec)
720 q->pc_count += p->pc_count;
721 q->count += p->count;
728 *pp = edir->dyn_relocs;
731 edir->dyn_relocs = eind->dyn_relocs;
732 eind->dyn_relocs = NULL;
735 if (ind->root.type == bfd_link_hash_indirect
736 && dir->got.refcount <= 0)
738 edir->tls_type = eind->tls_type;
739 eind->tls_type = GOT_UNKNOWN;
742 if (ELIMINATE_COPY_RELOCS
743 && ind->root.type != bfd_link_hash_indirect
744 && dir->dynamic_adjusted)
746 /* If called to transfer flags for a weakdef during processing
747 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
748 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
749 dir->ref_dynamic |= ind->ref_dynamic;
750 dir->ref_regular |= ind->ref_regular;
751 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
752 dir->needs_plt |= ind->needs_plt;
753 dir->pointer_equality_needed |= ind->pointer_equality_needed;
756 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
760 elf64_x86_64_elf_object_p (bfd *abfd)
762 /* Set the right machine number for an x86-64 elf64 file. */
763 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
781 /* Return TRUE if the TLS access code sequence support transition
785 elf64_x86_64_check_tls_transition (bfd *abfd, asection *sec,
787 Elf_Internal_Shdr *symtab_hdr,
788 struct elf_link_hash_entry **sym_hashes,
790 const Elf_Internal_Rela *rel,
791 const Elf_Internal_Rela *relend)
794 unsigned long r_symndx;
795 struct elf_link_hash_entry *h;
798 /* Get the section contents. */
799 if (contents == NULL)
801 if (elf_section_data (sec)->this_hdr.contents != NULL)
802 contents = elf_section_data (sec)->this_hdr.contents;
805 /* FIXME: How to better handle error condition? */
806 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
809 /* Cache the section contents for elf_link_input_bfd. */
810 elf_section_data (sec)->this_hdr.contents = contents;
814 offset = rel->r_offset;
819 if ((rel + 1) >= relend)
822 if (r_type == R_X86_64_TLSGD)
824 /* Check transition from GD access model. Only
825 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
826 .word 0x6666; rex64; call __tls_get_addr
827 can transit to different access model. */
829 static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
830 call = { { 0x66, 0x66, 0x48, 0xe8 } };
832 || (offset + 12) > sec->size
833 || bfd_get_32 (abfd, contents + offset - 4) != leaq.i
834 || bfd_get_32 (abfd, contents + offset + 4) != call.i)
839 /* Check transition from LD access model. Only
840 leaq foo@tlsld(%rip), %rdi;
842 can transit to different access model. */
844 static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
847 if (offset < 3 || (offset + 9) > sec->size)
850 op.i = bfd_get_32 (abfd, contents + offset - 3);
851 op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
856 r_symndx = ELF64_R_SYM (rel[1].r_info);
857 if (r_symndx < symtab_hdr->sh_info)
860 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
861 /* Use strncmp to check __tls_get_addr since __tls_get_addr
864 && h->root.root.string != NULL
865 && (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PC32
866 || ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
867 && (strncmp (h->root.root.string,
868 "__tls_get_addr", 14) == 0));
870 case R_X86_64_GOTTPOFF:
871 /* Check transition from IE access model:
872 movq foo@gottpoff(%rip), %reg
873 addq foo@gottpoff(%rip), %reg
876 if (offset < 3 || (offset + 4) > sec->size)
879 val = bfd_get_8 (abfd, contents + offset - 3);
880 if (val != 0x48 && val != 0x4c)
883 val = bfd_get_8 (abfd, contents + offset - 2);
884 if (val != 0x8b && val != 0x03)
887 val = bfd_get_8 (abfd, contents + offset - 1);
888 return (val & 0xc7) == 5;
890 case R_X86_64_GOTPC32_TLSDESC:
891 /* Check transition from GDesc access model:
892 leaq x@tlsdesc(%rip), %rax
894 Make sure it's a leaq adding rip to a 32-bit offset
895 into any register, although it's probably almost always
898 if (offset < 3 || (offset + 4) > sec->size)
901 val = bfd_get_8 (abfd, contents + offset - 3);
902 if ((val & 0xfb) != 0x48)
905 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
908 val = bfd_get_8 (abfd, contents + offset - 1);
909 return (val & 0xc7) == 0x05;
911 case R_X86_64_TLSDESC_CALL:
912 /* Check transition from GDesc access model:
913 call *x@tlsdesc(%rax)
915 if (offset + 2 <= sec->size)
917 /* Make sure that it's a call *x@tlsdesc(%rax). */
918 static x86_64_opcode16 call = { { 0xff, 0x10 } };
919 return bfd_get_16 (abfd, contents + offset) == call.i;
929 /* Return TRUE if the TLS access transition is OK or no transition
930 will be performed. Update R_TYPE if there is a transition. */
933 elf64_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
934 asection *sec, bfd_byte *contents,
935 Elf_Internal_Shdr *symtab_hdr,
936 struct elf_link_hash_entry **sym_hashes,
937 unsigned int *r_type, int tls_type,
938 const Elf_Internal_Rela *rel,
939 const Elf_Internal_Rela *relend,
940 struct elf_link_hash_entry *h,
941 unsigned long r_symndx)
943 unsigned int from_type = *r_type;
944 unsigned int to_type = from_type;
945 bfd_boolean check = TRUE;
950 case R_X86_64_GOTPC32_TLSDESC:
951 case R_X86_64_TLSDESC_CALL:
952 case R_X86_64_GOTTPOFF:
956 to_type = R_X86_64_TPOFF32;
958 to_type = R_X86_64_GOTTPOFF;
961 /* When we are called from elf64_x86_64_relocate_section,
962 CONTENTS isn't NULL and there may be additional transitions
963 based on TLS_TYPE. */
964 if (contents != NULL)
966 unsigned int new_to_type = to_type;
971 && tls_type == GOT_TLS_IE)
972 new_to_type = R_X86_64_TPOFF32;
974 if (to_type == R_X86_64_TLSGD
975 || to_type == R_X86_64_GOTPC32_TLSDESC
976 || to_type == R_X86_64_TLSDESC_CALL)
978 if (tls_type == GOT_TLS_IE)
979 new_to_type = R_X86_64_GOTTPOFF;
982 /* We checked the transition before when we were called from
983 elf64_x86_64_check_relocs. We only want to check the new
984 transition which hasn't been checked before. */
985 check = new_to_type != to_type && from_type == to_type;
986 to_type = new_to_type;
993 to_type = R_X86_64_TPOFF32;
1000 /* Return TRUE if there is no transition. */
1001 if (from_type == to_type)
1004 /* Check if the transition can be performed. */
1006 && ! elf64_x86_64_check_tls_transition (abfd, sec, contents,
1007 symtab_hdr, sym_hashes,
1008 from_type, rel, relend))
1010 reloc_howto_type *from, *to;
1013 from = elf64_x86_64_rtype_to_howto (abfd, from_type);
1014 to = elf64_x86_64_rtype_to_howto (abfd, to_type);
1017 name = h->root.root.string;
1020 Elf_Internal_Sym *isym;
1021 struct elf64_x86_64_link_hash_table *htab;
1022 htab = elf64_x86_64_hash_table (info);
1023 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1025 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1028 (*_bfd_error_handler)
1029 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1030 "in section `%A' failed"),
1031 abfd, sec, from->name, to->name, name,
1032 (unsigned long) rel->r_offset);
1033 bfd_set_error (bfd_error_bad_value);
1041 /* Look through the relocs for a section during the first phase, and
1042 calculate needed space in the global offset table, procedure
1043 linkage table, and dynamic reloc sections. */
1046 elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1048 const Elf_Internal_Rela *relocs)
1050 struct elf64_x86_64_link_hash_table *htab;
1051 Elf_Internal_Shdr *symtab_hdr;
1052 struct elf_link_hash_entry **sym_hashes;
1053 const Elf_Internal_Rela *rel;
1054 const Elf_Internal_Rela *rel_end;
1057 if (info->relocatable)
1060 BFD_ASSERT (is_x86_64_elf (abfd));
1062 htab = elf64_x86_64_hash_table (info);
1063 symtab_hdr = &elf_symtab_hdr (abfd);
1064 sym_hashes = elf_sym_hashes (abfd);
1068 rel_end = relocs + sec->reloc_count;
1069 for (rel = relocs; rel < rel_end; rel++)
1071 unsigned int r_type;
1072 unsigned long r_symndx;
1073 struct elf_link_hash_entry *h;
1074 Elf_Internal_Sym *isym;
1077 r_symndx = ELF64_R_SYM (rel->r_info);
1078 r_type = ELF64_R_TYPE (rel->r_info);
1080 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1082 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1087 if (r_symndx < symtab_hdr->sh_info)
1089 /* A local symbol. */
1090 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1095 /* Check relocation against local STT_GNU_IFUNC symbol. */
1096 if (ELF64_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1098 h = elf64_x86_64_get_local_sym_hash (htab, abfd, rel,
1103 /* Fake a STT_GNU_IFUNC symbol. */
1104 h->type = STT_GNU_IFUNC;
1107 h->forced_local = 1;
1108 h->root.type = bfd_link_hash_defined;
1116 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1117 while (h->root.type == bfd_link_hash_indirect
1118 || h->root.type == bfd_link_hash_warning)
1119 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1124 /* Create the ifunc sections for static executables. If we
1125 never see an indirect function symbol nor we are building
1126 a static executable, those sections will be empty and
1127 won't appear in output. */
1138 case R_X86_64_PLT32:
1139 case R_X86_64_GOTPCREL:
1140 case R_X86_64_GOTPCREL64:
1141 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1146 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1147 it here if it is defined in a non-shared object. */
1148 if (h->type == STT_GNU_IFUNC
1151 /* It is referenced by a non-shared object. */
1155 /* STT_GNU_IFUNC symbol must go through PLT. */
1156 h->plt.refcount += 1;
1158 /* STT_GNU_IFUNC needs dynamic sections. */
1159 if (htab->elf.dynobj == NULL)
1160 htab->elf.dynobj = abfd;
1165 if (h->root.root.string)
1166 name = h->root.root.string;
1168 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1170 (*_bfd_error_handler)
1171 (_("%B: relocation %s against STT_GNU_IFUNC "
1172 "symbol `%s' isn't handled by %s"), abfd,
1173 x86_64_elf_howto_table[r_type].name,
1174 name, __FUNCTION__);
1175 bfd_set_error (bfd_error_bad_value);
1180 h->pointer_equality_needed = 1;
1183 /* We must copy these reloc types into the output
1184 file. Create a reloc section in dynobj and
1185 make room for this reloc. */
1186 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1187 (abfd, info, sec, sreloc,
1188 &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs);
1199 if (r_type != R_X86_64_PC32
1200 && r_type != R_X86_64_PC64)
1201 h->pointer_equality_needed = 1;
1204 case R_X86_64_PLT32:
1207 case R_X86_64_GOTPCREL:
1208 case R_X86_64_GOTPCREL64:
1209 h->got.refcount += 1;
1210 if (htab->elf.sgot == NULL
1211 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1221 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1222 symtab_hdr, sym_hashes,
1223 &r_type, GOT_UNKNOWN,
1224 rel, rel_end, h, r_symndx))
1229 case R_X86_64_TLSLD:
1230 htab->tls_ld_got.refcount += 1;
1233 case R_X86_64_TPOFF32:
1237 name = h->root.root.string;
1239 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1241 (*_bfd_error_handler)
1242 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1244 x86_64_elf_howto_table[r_type].name, name);
1245 bfd_set_error (bfd_error_bad_value);
1250 case R_X86_64_GOTTPOFF:
1252 info->flags |= DF_STATIC_TLS;
1255 case R_X86_64_GOT32:
1256 case R_X86_64_GOTPCREL:
1257 case R_X86_64_TLSGD:
1258 case R_X86_64_GOT64:
1259 case R_X86_64_GOTPCREL64:
1260 case R_X86_64_GOTPLT64:
1261 case R_X86_64_GOTPC32_TLSDESC:
1262 case R_X86_64_TLSDESC_CALL:
1263 /* This symbol requires a global offset table entry. */
1265 int tls_type, old_tls_type;
1269 default: tls_type = GOT_NORMAL; break;
1270 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1271 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1272 case R_X86_64_GOTPC32_TLSDESC:
1273 case R_X86_64_TLSDESC_CALL:
1274 tls_type = GOT_TLS_GDESC; break;
1279 if (r_type == R_X86_64_GOTPLT64)
1281 /* This relocation indicates that we also need
1282 a PLT entry, as this is a function. We don't need
1283 a PLT entry for local symbols. */
1285 h->plt.refcount += 1;
1287 h->got.refcount += 1;
1288 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1292 bfd_signed_vma *local_got_refcounts;
1294 /* This is a global offset table entry for a local symbol. */
1295 local_got_refcounts = elf_local_got_refcounts (abfd);
1296 if (local_got_refcounts == NULL)
1300 size = symtab_hdr->sh_info;
1301 size *= sizeof (bfd_signed_vma)
1302 + sizeof (bfd_vma) + sizeof (char);
1303 local_got_refcounts = ((bfd_signed_vma *)
1304 bfd_zalloc (abfd, size));
1305 if (local_got_refcounts == NULL)
1307 elf_local_got_refcounts (abfd) = local_got_refcounts;
1308 elf64_x86_64_local_tlsdesc_gotent (abfd)
1309 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1310 elf64_x86_64_local_got_tls_type (abfd)
1311 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1313 local_got_refcounts[r_symndx] += 1;
1315 = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
1318 /* If a TLS symbol is accessed using IE at least once,
1319 there is no point to use dynamic model for it. */
1320 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1321 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1322 || tls_type != GOT_TLS_IE))
1324 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1325 tls_type = old_tls_type;
1326 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1327 && GOT_TLS_GD_ANY_P (tls_type))
1328 tls_type |= old_tls_type;
1332 name = h->root.root.string;
1334 name = bfd_elf_sym_name (abfd, symtab_hdr,
1336 (*_bfd_error_handler)
1337 (_("%B: '%s' accessed both as normal and thread local symbol"),
1343 if (old_tls_type != tls_type)
1346 elf64_x86_64_hash_entry (h)->tls_type = tls_type;
1348 elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1353 case R_X86_64_GOTOFF64:
1354 case R_X86_64_GOTPC32:
1355 case R_X86_64_GOTPC64:
1357 if (htab->elf.sgot == NULL)
1359 if (htab->elf.dynobj == NULL)
1360 htab->elf.dynobj = abfd;
1361 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1367 case R_X86_64_PLT32:
1368 /* This symbol requires a procedure linkage table entry. We
1369 actually build the entry in adjust_dynamic_symbol,
1370 because this might be a case of linking PIC code which is
1371 never referenced by a dynamic object, in which case we
1372 don't need to generate a procedure linkage table entry
1375 /* If this is a local symbol, we resolve it directly without
1376 creating a procedure linkage table entry. */
1381 h->plt.refcount += 1;
1384 case R_X86_64_PLTOFF64:
1385 /* This tries to form the 'address' of a function relative
1386 to GOT. For global symbols we need a PLT entry. */
1390 h->plt.refcount += 1;
1398 /* Let's help debug shared library creation. These relocs
1399 cannot be used in shared libs. Don't error out for
1400 sections we don't care about, such as debug sections or
1401 non-constant sections. */
1403 && (sec->flags & SEC_ALLOC) != 0
1404 && (sec->flags & SEC_READONLY) != 0)
1407 name = h->root.root.string;
1409 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1410 (*_bfd_error_handler)
1411 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1412 abfd, x86_64_elf_howto_table[r_type].name, name);
1413 bfd_set_error (bfd_error_bad_value);
1423 if (h != NULL && info->executable)
1425 /* If this reloc is in a read-only section, we might
1426 need a copy reloc. We can't check reliably at this
1427 stage whether the section is read-only, as input
1428 sections have not yet been mapped to output sections.
1429 Tentatively set the flag for now, and correct in
1430 adjust_dynamic_symbol. */
1433 /* We may need a .plt entry if the function this reloc
1434 refers to is in a shared lib. */
1435 h->plt.refcount += 1;
1436 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1437 h->pointer_equality_needed = 1;
1440 /* If we are creating a shared library, and this is a reloc
1441 against a global symbol, or a non PC relative reloc
1442 against a local symbol, then we need to copy the reloc
1443 into the shared library. However, if we are linking with
1444 -Bsymbolic, we do not need to copy a reloc against a
1445 global symbol which is defined in an object we are
1446 including in the link (i.e., DEF_REGULAR is set). At
1447 this point we have not seen all the input files, so it is
1448 possible that DEF_REGULAR is not set now but will be set
1449 later (it is never cleared). In case of a weak definition,
1450 DEF_REGULAR may be cleared later by a strong definition in
1451 a shared library. We account for that possibility below by
1452 storing information in the relocs_copied field of the hash
1453 table entry. A similar situation occurs when creating
1454 shared libraries and symbol visibility changes render the
1457 If on the other hand, we are creating an executable, we
1458 may need to keep relocations for symbols satisfied by a
1459 dynamic library if we manage to avoid copy relocs for the
1462 && (sec->flags & SEC_ALLOC) != 0
1463 && (! IS_X86_64_PCREL_TYPE (r_type)
1465 && (! SYMBOLIC_BIND (info, h)
1466 || h->root.type == bfd_link_hash_defweak
1467 || !h->def_regular))))
1468 || (ELIMINATE_COPY_RELOCS
1470 && (sec->flags & SEC_ALLOC) != 0
1472 && (h->root.type == bfd_link_hash_defweak
1473 || !h->def_regular)))
1475 struct elf_dyn_relocs *p;
1476 struct elf_dyn_relocs **head;
1478 /* We must copy these reloc types into the output file.
1479 Create a reloc section in dynobj and make room for
1483 if (htab->elf.dynobj == NULL)
1484 htab->elf.dynobj = abfd;
1486 sreloc = _bfd_elf_make_dynamic_reloc_section
1487 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1493 /* If this is a global symbol, we count the number of
1494 relocations we need for this symbol. */
1497 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
1501 /* Track dynamic relocs needed for local syms too.
1502 We really need local syms available to do this
1506 Elf_Internal_Sym *isym;
1508 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1513 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1517 /* Beware of type punned pointers vs strict aliasing
1519 vpp = &(elf_section_data (s)->local_dynrel);
1520 head = (struct elf_dyn_relocs **)vpp;
1524 if (p == NULL || p->sec != sec)
1526 bfd_size_type amt = sizeof *p;
1528 p = ((struct elf_dyn_relocs *)
1529 bfd_alloc (htab->elf.dynobj, amt));
1540 if (IS_X86_64_PCREL_TYPE (r_type))
1545 /* This relocation describes the C++ object vtable hierarchy.
1546 Reconstruct it for later use during GC. */
1547 case R_X86_64_GNU_VTINHERIT:
1548 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1552 /* This relocation describes which C++ vtable entries are actually
1553 used. Record for later use during GC. */
1554 case R_X86_64_GNU_VTENTRY:
1555 BFD_ASSERT (h != NULL);
1557 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1569 /* Return the section that should be marked against GC for a given
1573 elf64_x86_64_gc_mark_hook (asection *sec,
1574 struct bfd_link_info *info,
1575 Elf_Internal_Rela *rel,
1576 struct elf_link_hash_entry *h,
1577 Elf_Internal_Sym *sym)
1580 switch (ELF64_R_TYPE (rel->r_info))
1582 case R_X86_64_GNU_VTINHERIT:
1583 case R_X86_64_GNU_VTENTRY:
1587 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1590 /* Update the got entry reference counts for the section being removed. */
1593 elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1595 const Elf_Internal_Rela *relocs)
1597 Elf_Internal_Shdr *symtab_hdr;
1598 struct elf_link_hash_entry **sym_hashes;
1599 bfd_signed_vma *local_got_refcounts;
1600 const Elf_Internal_Rela *rel, *relend;
1602 if (info->relocatable)
1605 elf_section_data (sec)->local_dynrel = NULL;
1607 symtab_hdr = &elf_symtab_hdr (abfd);
1608 sym_hashes = elf_sym_hashes (abfd);
1609 local_got_refcounts = elf_local_got_refcounts (abfd);
1611 relend = relocs + sec->reloc_count;
1612 for (rel = relocs; rel < relend; rel++)
1614 unsigned long r_symndx;
1615 unsigned int r_type;
1616 struct elf_link_hash_entry *h = NULL;
1618 r_symndx = ELF64_R_SYM (rel->r_info);
1619 if (r_symndx >= symtab_hdr->sh_info)
1621 struct elf64_x86_64_link_hash_entry *eh;
1622 struct elf_dyn_relocs **pp;
1623 struct elf_dyn_relocs *p;
1625 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1626 while (h->root.type == bfd_link_hash_indirect
1627 || h->root.type == bfd_link_hash_warning)
1628 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1629 eh = (struct elf64_x86_64_link_hash_entry *) h;
1631 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1634 /* Everything must go for SEC. */
1640 r_type = ELF64_R_TYPE (rel->r_info);
1641 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1642 symtab_hdr, sym_hashes,
1643 &r_type, GOT_UNKNOWN,
1644 rel, relend, h, r_symndx))
1649 case R_X86_64_TLSLD:
1650 if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0)
1651 elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1;
1654 case R_X86_64_TLSGD:
1655 case R_X86_64_GOTPC32_TLSDESC:
1656 case R_X86_64_TLSDESC_CALL:
1657 case R_X86_64_GOTTPOFF:
1658 case R_X86_64_GOT32:
1659 case R_X86_64_GOTPCREL:
1660 case R_X86_64_GOT64:
1661 case R_X86_64_GOTPCREL64:
1662 case R_X86_64_GOTPLT64:
1665 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1666 h->plt.refcount -= 1;
1667 if (h->got.refcount > 0)
1668 h->got.refcount -= 1;
1670 else if (local_got_refcounts != NULL)
1672 if (local_got_refcounts[r_symndx] > 0)
1673 local_got_refcounts[r_symndx] -= 1;
1690 case R_X86_64_PLT32:
1691 case R_X86_64_PLTOFF64:
1694 if (h->plt.refcount > 0)
1695 h->plt.refcount -= 1;
1707 /* Adjust a symbol defined by a dynamic object and referenced by a
1708 regular object. The current definition is in some section of the
1709 dynamic object, but we're not including those sections. We have to
1710 change the definition to something the rest of the link can
1714 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1715 struct elf_link_hash_entry *h)
1717 struct elf64_x86_64_link_hash_table *htab;
1720 /* STT_GNU_IFUNC symbol must go through PLT. */
1721 if (h->type == STT_GNU_IFUNC)
1723 if (h->plt.refcount <= 0)
1725 h->plt.offset = (bfd_vma) -1;
1731 /* If this is a function, put it in the procedure linkage table. We
1732 will fill in the contents of the procedure linkage table later,
1733 when we know the address of the .got section. */
1734 if (h->type == STT_FUNC
1737 if (h->plt.refcount <= 0
1738 || SYMBOL_CALLS_LOCAL (info, h)
1739 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1740 && h->root.type == bfd_link_hash_undefweak))
1742 /* This case can occur if we saw a PLT32 reloc in an input
1743 file, but the symbol was never referred to by a dynamic
1744 object, or if all references were garbage collected. In
1745 such a case, we don't actually need to build a procedure
1746 linkage table, and we can just do a PC32 reloc instead. */
1747 h->plt.offset = (bfd_vma) -1;
1754 /* It's possible that we incorrectly decided a .plt reloc was
1755 needed for an R_X86_64_PC32 reloc to a non-function sym in
1756 check_relocs. We can't decide accurately between function and
1757 non-function syms in check-relocs; Objects loaded later in
1758 the link may change h->type. So fix it now. */
1759 h->plt.offset = (bfd_vma) -1;
1761 /* If this is a weak symbol, and there is a real definition, the
1762 processor independent code will have arranged for us to see the
1763 real definition first, and we can just use the same value. */
1764 if (h->u.weakdef != NULL)
1766 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1767 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1768 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1769 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1770 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1771 h->non_got_ref = h->u.weakdef->non_got_ref;
1775 /* This is a reference to a symbol defined by a dynamic object which
1776 is not a function. */
1778 /* If we are creating a shared library, we must presume that the
1779 only references to the symbol are via the global offset table.
1780 For such cases we need not do anything here; the relocations will
1781 be handled correctly by relocate_section. */
1785 /* If there are no references to this symbol that do not use the
1786 GOT, we don't need to generate a copy reloc. */
1787 if (!h->non_got_ref)
1790 /* If -z nocopyreloc was given, we won't generate them either. */
1791 if (info->nocopyreloc)
1797 if (ELIMINATE_COPY_RELOCS)
1799 struct elf64_x86_64_link_hash_entry * eh;
1800 struct elf_dyn_relocs *p;
1802 eh = (struct elf64_x86_64_link_hash_entry *) h;
1803 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1805 s = p->sec->output_section;
1806 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1810 /* If we didn't find any dynamic relocs in read-only sections, then
1811 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1821 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1822 h->root.root.string);
1826 /* We must allocate the symbol in our .dynbss section, which will
1827 become part of the .bss section of the executable. There will be
1828 an entry for this symbol in the .dynsym section. The dynamic
1829 object will contain position independent code, so all references
1830 from the dynamic object to this symbol will go through the global
1831 offset table. The dynamic linker will use the .dynsym entry to
1832 determine the address it must put in the global offset table, so
1833 both the dynamic object and the regular object will refer to the
1834 same memory location for the variable. */
1836 htab = elf64_x86_64_hash_table (info);
1838 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1839 to copy the initial value out of the dynamic object and into the
1840 runtime process image. */
1841 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1843 htab->srelbss->size += sizeof (Elf64_External_Rela);
1849 return _bfd_elf_adjust_dynamic_copy (h, s);
1852 /* Allocate space in .plt, .got and associated reloc sections for
1856 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1858 struct bfd_link_info *info;
1859 struct elf64_x86_64_link_hash_table *htab;
1860 struct elf64_x86_64_link_hash_entry *eh;
1861 struct elf_dyn_relocs *p;
1863 if (h->root.type == bfd_link_hash_indirect)
1866 if (h->root.type == bfd_link_hash_warning)
1867 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1868 eh = (struct elf64_x86_64_link_hash_entry *) h;
1870 info = (struct bfd_link_info *) inf;
1871 htab = elf64_x86_64_hash_table (info);
1873 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1874 here if it is defined and referenced in a non-shared object. */
1875 if (h->type == STT_GNU_IFUNC
1877 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
1881 else if (htab->elf.dynamic_sections_created
1882 && h->plt.refcount > 0)
1884 /* Make sure this symbol is output as a dynamic symbol.
1885 Undefined weak syms won't yet be marked as dynamic. */
1886 if (h->dynindx == -1
1887 && !h->forced_local)
1889 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1894 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1896 asection *s = htab->elf.splt;
1898 /* If this is the first .plt entry, make room for the special
1901 s->size += PLT_ENTRY_SIZE;
1903 h->plt.offset = s->size;
1905 /* If this symbol is not defined in a regular file, and we are
1906 not generating a shared library, then set the symbol to this
1907 location in the .plt. This is required to make function
1908 pointers compare as equal between the normal executable and
1909 the shared library. */
1913 h->root.u.def.section = s;
1914 h->root.u.def.value = h->plt.offset;
1917 /* Make room for this entry. */
1918 s->size += PLT_ENTRY_SIZE;
1920 /* We also need to make an entry in the .got.plt section, which
1921 will be placed in the .got section by the linker script. */
1922 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1924 /* We also need to make an entry in the .rela.plt section. */
1925 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1926 htab->elf.srelplt->reloc_count++;
1930 h->plt.offset = (bfd_vma) -1;
1936 h->plt.offset = (bfd_vma) -1;
1940 eh->tlsdesc_got = (bfd_vma) -1;
1942 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1943 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1944 if (h->got.refcount > 0
1947 && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
1949 h->got.offset = (bfd_vma) -1;
1951 else if (h->got.refcount > 0)
1955 int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1957 /* Make sure this symbol is output as a dynamic symbol.
1958 Undefined weak syms won't yet be marked as dynamic. */
1959 if (h->dynindx == -1
1960 && !h->forced_local)
1962 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1966 if (GOT_TLS_GDESC_P (tls_type))
1968 eh->tlsdesc_got = htab->elf.sgotplt->size
1969 - elf64_x86_64_compute_jump_table_size (htab);
1970 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
1971 h->got.offset = (bfd_vma) -2;
1973 if (! GOT_TLS_GDESC_P (tls_type)
1974 || GOT_TLS_GD_P (tls_type))
1977 h->got.offset = s->size;
1978 s->size += GOT_ENTRY_SIZE;
1979 if (GOT_TLS_GD_P (tls_type))
1980 s->size += GOT_ENTRY_SIZE;
1982 dyn = htab->elf.dynamic_sections_created;
1983 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1985 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1986 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1987 || tls_type == GOT_TLS_IE)
1988 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1989 else if (GOT_TLS_GD_P (tls_type))
1990 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
1991 else if (! GOT_TLS_GDESC_P (tls_type)
1992 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1993 || h->root.type != bfd_link_hash_undefweak)
1995 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1996 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1997 if (GOT_TLS_GDESC_P (tls_type))
1999 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
2000 htab->tlsdesc_plt = (bfd_vma) -1;
2004 h->got.offset = (bfd_vma) -1;
2006 if (eh->dyn_relocs == NULL)
2009 /* In the shared -Bsymbolic case, discard space allocated for
2010 dynamic pc-relative relocs against symbols which turn out to be
2011 defined in regular objects. For the normal shared case, discard
2012 space for pc-relative relocs that have become local due to symbol
2013 visibility changes. */
2017 /* Relocs that use pc_count are those that appear on a call
2018 insn, or certain REL relocs that can generated via assembly.
2019 We want calls to protected symbols to resolve directly to the
2020 function rather than going via the plt. If people want
2021 function pointer comparisons to work as expected then they
2022 should avoid writing weird assembly. */
2023 if (SYMBOL_CALLS_LOCAL (info, h))
2025 struct elf_dyn_relocs **pp;
2027 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2029 p->count -= p->pc_count;
2038 /* Also discard relocs on undefined weak syms with non-default
2040 if (eh->dyn_relocs != NULL
2041 && h->root.type == bfd_link_hash_undefweak)
2043 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2044 eh->dyn_relocs = NULL;
2046 /* Make sure undefined weak symbols are output as a dynamic
2048 else if (h->dynindx == -1
2049 && ! h->forced_local
2050 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2055 else if (ELIMINATE_COPY_RELOCS)
2057 /* For the non-shared case, discard space for relocs against
2058 symbols which turn out to need copy relocs or are not
2064 || (htab->elf.dynamic_sections_created
2065 && (h->root.type == bfd_link_hash_undefweak
2066 || h->root.type == bfd_link_hash_undefined))))
2068 /* Make sure this symbol is output as a dynamic symbol.
2069 Undefined weak syms won't yet be marked as dynamic. */
2070 if (h->dynindx == -1
2071 && ! h->forced_local
2072 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2075 /* If that succeeded, we know we'll be keeping all the
2077 if (h->dynindx != -1)
2081 eh->dyn_relocs = NULL;
2086 /* Finally, allocate space. */
2087 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2091 sreloc = elf_section_data (p->sec)->sreloc;
2093 BFD_ASSERT (sreloc != NULL);
2095 sreloc->size += p->count * sizeof (Elf64_External_Rela);
2101 /* Allocate space in .plt, .got and associated reloc sections for
2102 local dynamic relocs. */
2105 elf64_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2107 struct elf_link_hash_entry *h
2108 = (struct elf_link_hash_entry *) *slot;
2110 if (h->type != STT_GNU_IFUNC
2114 || h->root.type != bfd_link_hash_defined)
2117 return elf64_x86_64_allocate_dynrelocs (h, inf);
2120 /* Find any dynamic relocs that apply to read-only sections. */
2123 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2125 struct elf64_x86_64_link_hash_entry *eh;
2126 struct elf_dyn_relocs *p;
2128 if (h->root.type == bfd_link_hash_warning)
2129 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2131 eh = (struct elf64_x86_64_link_hash_entry *) h;
2132 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2134 asection *s = p->sec->output_section;
2136 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2138 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2140 info->flags |= DF_TEXTREL;
2142 /* Not an error, just cut short the traversal. */
2149 /* Set the sizes of the dynamic sections. */
2152 elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2153 struct bfd_link_info *info)
2155 struct elf64_x86_64_link_hash_table *htab;
2161 htab = elf64_x86_64_hash_table (info);
2162 dynobj = htab->elf.dynobj;
2166 if (htab->elf.dynamic_sections_created)
2168 /* Set the contents of the .interp section to the interpreter. */
2169 if (info->executable)
2171 s = bfd_get_section_by_name (dynobj, ".interp");
2174 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2175 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2179 /* Set up .got offsets for local syms, and space for local dynamic
2181 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2183 bfd_signed_vma *local_got;
2184 bfd_signed_vma *end_local_got;
2185 char *local_tls_type;
2186 bfd_vma *local_tlsdesc_gotent;
2187 bfd_size_type locsymcount;
2188 Elf_Internal_Shdr *symtab_hdr;
2191 if (! is_x86_64_elf (ibfd))
2194 for (s = ibfd->sections; s != NULL; s = s->next)
2196 struct elf_dyn_relocs *p;
2198 for (p = (struct elf_dyn_relocs *)
2199 (elf_section_data (s)->local_dynrel);
2203 if (!bfd_is_abs_section (p->sec)
2204 && bfd_is_abs_section (p->sec->output_section))
2206 /* Input section has been discarded, either because
2207 it is a copy of a linkonce section or due to
2208 linker script /DISCARD/, so we'll be discarding
2211 else if (p->count != 0)
2213 srel = elf_section_data (p->sec)->sreloc;
2214 srel->size += p->count * sizeof (Elf64_External_Rela);
2215 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2216 info->flags |= DF_TEXTREL;
2221 local_got = elf_local_got_refcounts (ibfd);
2225 symtab_hdr = &elf_symtab_hdr (ibfd);
2226 locsymcount = symtab_hdr->sh_info;
2227 end_local_got = local_got + locsymcount;
2228 local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
2229 local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd);
2231 srel = htab->elf.srelgot;
2232 for (; local_got < end_local_got;
2233 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2235 *local_tlsdesc_gotent = (bfd_vma) -1;
2238 if (GOT_TLS_GDESC_P (*local_tls_type))
2240 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2241 - elf64_x86_64_compute_jump_table_size (htab);
2242 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2243 *local_got = (bfd_vma) -2;
2245 if (! GOT_TLS_GDESC_P (*local_tls_type)
2246 || GOT_TLS_GD_P (*local_tls_type))
2248 *local_got = s->size;
2249 s->size += GOT_ENTRY_SIZE;
2250 if (GOT_TLS_GD_P (*local_tls_type))
2251 s->size += GOT_ENTRY_SIZE;
2254 || GOT_TLS_GD_ANY_P (*local_tls_type)
2255 || *local_tls_type == GOT_TLS_IE)
2257 if (GOT_TLS_GDESC_P (*local_tls_type))
2259 htab->elf.srelplt->size
2260 += sizeof (Elf64_External_Rela);
2261 htab->tlsdesc_plt = (bfd_vma) -1;
2263 if (! GOT_TLS_GDESC_P (*local_tls_type)
2264 || GOT_TLS_GD_P (*local_tls_type))
2265 srel->size += sizeof (Elf64_External_Rela);
2269 *local_got = (bfd_vma) -1;
2273 if (htab->tls_ld_got.refcount > 0)
2275 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2277 htab->tls_ld_got.offset = htab->elf.sgot->size;
2278 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2279 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2282 htab->tls_ld_got.offset = -1;
2284 /* Allocate global sym .plt and .got entries, and space for global
2285 sym dynamic relocs. */
2286 elf_link_hash_traverse (&htab->elf, elf64_x86_64_allocate_dynrelocs,
2289 /* Allocate .plt and .got entries, and space for local symbols. */
2290 htab_traverse (htab->loc_hash_table,
2291 elf64_x86_64_allocate_local_dynrelocs,
2294 /* For every jump slot reserved in the sgotplt, reloc_count is
2295 incremented. However, when we reserve space for TLS descriptors,
2296 it's not incremented, so in order to compute the space reserved
2297 for them, it suffices to multiply the reloc count by the jump
2299 if (htab->elf.srelplt)
2300 htab->sgotplt_jump_table_size
2301 = elf64_x86_64_compute_jump_table_size (htab);
2303 if (htab->tlsdesc_plt)
2305 /* If we're not using lazy TLS relocations, don't generate the
2306 PLT and GOT entries they require. */
2307 if ((info->flags & DF_BIND_NOW))
2308 htab->tlsdesc_plt = 0;
2311 htab->tlsdesc_got = htab->elf.sgot->size;
2312 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2313 /* Reserve room for the initial entry.
2314 FIXME: we could probably do away with it in this case. */
2315 if (htab->elf.splt->size == 0)
2316 htab->elf.splt->size += PLT_ENTRY_SIZE;
2317 htab->tlsdesc_plt = htab->elf.splt->size;
2318 htab->elf.splt->size += PLT_ENTRY_SIZE;
2322 /* We now have determined the sizes of the various dynamic sections.
2323 Allocate memory for them. */
2325 for (s = dynobj->sections; s != NULL; s = s->next)
2327 if ((s->flags & SEC_LINKER_CREATED) == 0)
2330 if (s == htab->elf.splt
2331 || s == htab->elf.sgot
2332 || s == htab->elf.sgotplt
2333 || s == htab->elf.iplt
2334 || s == htab->elf.igotplt
2335 || s == htab->sdynbss)
2337 /* Strip this section if we don't need it; see the
2340 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2342 if (s->size != 0 && s != htab->elf.srelplt)
2345 /* We use the reloc_count field as a counter if we need
2346 to copy relocs into the output file. */
2347 if (s != htab->elf.srelplt)
2352 /* It's not one of our sections, so don't allocate space. */
2358 /* If we don't need this section, strip it from the
2359 output file. This is mostly to handle .rela.bss and
2360 .rela.plt. We must create both sections in
2361 create_dynamic_sections, because they must be created
2362 before the linker maps input sections to output
2363 sections. The linker does that before
2364 adjust_dynamic_symbol is called, and it is that
2365 function which decides whether anything needs to go
2366 into these sections. */
2368 s->flags |= SEC_EXCLUDE;
2372 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2375 /* Allocate memory for the section contents. We use bfd_zalloc
2376 here in case unused entries are not reclaimed before the
2377 section's contents are written out. This should not happen,
2378 but this way if it does, we get a R_X86_64_NONE reloc instead
2380 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2381 if (s->contents == NULL)
2385 if (htab->elf.dynamic_sections_created)
2387 /* Add some entries to the .dynamic section. We fill in the
2388 values later, in elf64_x86_64_finish_dynamic_sections, but we
2389 must add the entries now so that we get the correct size for
2390 the .dynamic section. The DT_DEBUG entry is filled in by the
2391 dynamic linker and used by the debugger. */
2392 #define add_dynamic_entry(TAG, VAL) \
2393 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2395 if (info->executable)
2397 if (!add_dynamic_entry (DT_DEBUG, 0))
2401 if (htab->elf.splt->size != 0)
2403 if (!add_dynamic_entry (DT_PLTGOT, 0)
2404 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2405 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2406 || !add_dynamic_entry (DT_JMPREL, 0))
2409 if (htab->tlsdesc_plt
2410 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2411 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2417 if (!add_dynamic_entry (DT_RELA, 0)
2418 || !add_dynamic_entry (DT_RELASZ, 0)
2419 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2422 /* If any dynamic relocs apply to a read-only section,
2423 then we need a DT_TEXTREL entry. */
2424 if ((info->flags & DF_TEXTREL) == 0)
2425 elf_link_hash_traverse (&htab->elf,
2426 elf64_x86_64_readonly_dynrelocs,
2429 if ((info->flags & DF_TEXTREL) != 0)
2431 if (!add_dynamic_entry (DT_TEXTREL, 0))
2436 #undef add_dynamic_entry
2442 elf64_x86_64_always_size_sections (bfd *output_bfd,
2443 struct bfd_link_info *info)
2445 asection *tls_sec = elf_hash_table (info)->tls_sec;
2449 struct elf_link_hash_entry *tlsbase;
2451 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2452 "_TLS_MODULE_BASE_",
2453 FALSE, FALSE, FALSE);
2455 if (tlsbase && tlsbase->type == STT_TLS)
2457 struct bfd_link_hash_entry *bh = NULL;
2458 const struct elf_backend_data *bed
2459 = get_elf_backend_data (output_bfd);
2461 if (!(_bfd_generic_link_add_one_symbol
2462 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2463 tls_sec, 0, NULL, FALSE,
2464 bed->collect, &bh)))
2467 elf64_x86_64_hash_table (info)->tls_module_base = bh;
2469 tlsbase = (struct elf_link_hash_entry *)bh;
2470 tlsbase->def_regular = 1;
2471 tlsbase->other = STV_HIDDEN;
2472 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2479 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2480 executables. Rather than setting it to the beginning of the TLS
2481 section, we have to set it to the end. This function may be called
2482 multiple times, it is idempotent. */
2485 elf64_x86_64_set_tls_module_base (struct bfd_link_info *info)
2487 struct bfd_link_hash_entry *base;
2489 if (!info->executable)
2492 base = elf64_x86_64_hash_table (info)->tls_module_base;
2497 base->u.def.value = elf_hash_table (info)->tls_size;
2500 /* Return the base VMA address which should be subtracted from real addresses
2501 when resolving @dtpoff relocation.
2502 This is PT_TLS segment p_vaddr. */
2505 elf64_x86_64_dtpoff_base (struct bfd_link_info *info)
2507 /* If tls_sec is NULL, we should have signalled an error already. */
2508 if (elf_hash_table (info)->tls_sec == NULL)
2510 return elf_hash_table (info)->tls_sec->vma;
2513 /* Return the relocation value for @tpoff relocation
2514 if STT_TLS virtual address is ADDRESS. */
2517 elf64_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2519 struct elf_link_hash_table *htab = elf_hash_table (info);
2521 /* If tls_segment is NULL, we should have signalled an error already. */
2522 if (htab->tls_sec == NULL)
2524 return address - htab->tls_size - htab->tls_sec->vma;
2527 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2531 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2533 /* Opcode Instruction
2536 0x0f 0x8x conditional jump */
2538 && (contents [offset - 1] == 0xe8
2539 || contents [offset - 1] == 0xe9))
2541 && contents [offset - 2] == 0x0f
2542 && (contents [offset - 1] & 0xf0) == 0x80));
2545 /* Relocate an x86_64 ELF section. */
2548 elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
2549 bfd *input_bfd, asection *input_section,
2550 bfd_byte *contents, Elf_Internal_Rela *relocs,
2551 Elf_Internal_Sym *local_syms,
2552 asection **local_sections)
2554 struct elf64_x86_64_link_hash_table *htab;
2555 Elf_Internal_Shdr *symtab_hdr;
2556 struct elf_link_hash_entry **sym_hashes;
2557 bfd_vma *local_got_offsets;
2558 bfd_vma *local_tlsdesc_gotents;
2559 Elf_Internal_Rela *rel;
2560 Elf_Internal_Rela *relend;
2562 BFD_ASSERT (is_x86_64_elf (input_bfd));
2564 htab = elf64_x86_64_hash_table (info);
2565 symtab_hdr = &elf_symtab_hdr (input_bfd);
2566 sym_hashes = elf_sym_hashes (input_bfd);
2567 local_got_offsets = elf_local_got_offsets (input_bfd);
2568 local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
2570 elf64_x86_64_set_tls_module_base (info);
2573 relend = relocs + input_section->reloc_count;
2574 for (; rel < relend; rel++)
2576 unsigned int r_type;
2577 reloc_howto_type *howto;
2578 unsigned long r_symndx;
2579 struct elf_link_hash_entry *h;
2580 Elf_Internal_Sym *sym;
2582 bfd_vma off, offplt;
2584 bfd_boolean unresolved_reloc;
2585 bfd_reloc_status_type r;
2589 r_type = ELF64_R_TYPE (rel->r_info);
2590 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2591 || r_type == (int) R_X86_64_GNU_VTENTRY)
2594 if (r_type >= R_X86_64_max)
2596 bfd_set_error (bfd_error_bad_value);
2600 howto = x86_64_elf_howto_table + r_type;
2601 r_symndx = ELF64_R_SYM (rel->r_info);
2605 unresolved_reloc = FALSE;
2606 if (r_symndx < symtab_hdr->sh_info)
2608 sym = local_syms + r_symndx;
2609 sec = local_sections[r_symndx];
2611 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2614 /* Relocate against local STT_GNU_IFUNC symbol. */
2615 if (ELF64_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2617 h = elf64_x86_64_get_local_sym_hash (htab, input_bfd,
2622 /* Set STT_GNU_IFUNC symbol value. */
2623 h->root.u.def.value = sym->st_value;
2624 h->root.u.def.section = sec;
2631 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2632 r_symndx, symtab_hdr, sym_hashes,
2634 unresolved_reloc, warned);
2637 if (sec != NULL && elf_discarded_section (sec))
2639 /* For relocs against symbols from removed linkonce sections,
2640 or sections discarded by a linker script, we just want the
2641 section contents zeroed. Avoid any special processing. */
2642 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2648 if (info->relocatable)
2651 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2652 it here if it is defined in a non-shared object. */
2654 && h->type == STT_GNU_IFUNC
2661 if ((input_section->flags & SEC_ALLOC) == 0
2662 || h->plt.offset == (bfd_vma) -1)
2665 /* STT_GNU_IFUNC symbol must go through PLT. */
2666 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
2667 relocation = (plt->output_section->vma
2668 + plt->output_offset + h->plt.offset);
2673 if (h->root.root.string)
2674 name = h->root.root.string;
2676 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2678 (*_bfd_error_handler)
2679 (_("%B: relocation %s against STT_GNU_IFUNC "
2680 "symbol `%s' isn't handled by %s"), input_bfd,
2681 x86_64_elf_howto_table[r_type].name,
2682 name, __FUNCTION__);
2683 bfd_set_error (bfd_error_bad_value);
2692 if (rel->r_addend != 0)
2694 if (h->root.root.string)
2695 name = h->root.root.string;
2697 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
2699 (*_bfd_error_handler)
2700 (_("%B: relocation %s against STT_GNU_IFUNC "
2701 "symbol `%s' has non-zero addend: %d"),
2702 input_bfd, x86_64_elf_howto_table[r_type].name,
2703 name, rel->r_addend);
2704 bfd_set_error (bfd_error_bad_value);
2708 /* Generate dynamic relcoation only when there is a
2709 non-GOF reference in a shared object. */
2710 if (info->shared && h->non_got_ref)
2712 Elf_Internal_Rela outrel;
2716 /* Need a dynamic relocation to get the real function
2718 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2722 if (outrel.r_offset == (bfd_vma) -1
2723 || outrel.r_offset == (bfd_vma) -2)
2726 outrel.r_offset += (input_section->output_section->vma
2727 + input_section->output_offset);
2729 if (h->dynindx == -1
2731 || info->executable)
2733 /* This symbol is resolved locally. */
2734 outrel.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
2735 outrel.r_addend = (h->root.u.def.value
2736 + h->root.u.def.section->output_section->vma
2737 + h->root.u.def.section->output_offset);
2741 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2742 outrel.r_addend = 0;
2745 sreloc = htab->elf.irelifunc;
2746 loc = sreloc->contents;
2747 loc += (sreloc->reloc_count++
2748 * sizeof (Elf64_External_Rela));
2749 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2751 /* If this reloc is against an external symbol, we
2752 do not want to fiddle with the addend. Otherwise,
2753 we need to include the symbol value so that it
2754 becomes an addend for the dynamic reloc. For an
2755 internal symbol, we have updated addend. */
2762 case R_X86_64_PLT32:
2765 case R_X86_64_GOTPCREL:
2766 case R_X86_64_GOTPCREL64:
2767 base_got = htab->elf.sgot;
2768 off = h->got.offset;
2770 if (base_got == NULL)
2773 if (off == (bfd_vma) -1)
2775 /* We can't use h->got.offset here to save state, or
2776 even just remember the offset, as finish_dynamic_symbol
2777 would use that as offset into .got. */
2779 if (htab->elf.splt != NULL)
2781 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2782 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2783 base_got = htab->elf.sgotplt;
2787 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2788 off = plt_index * GOT_ENTRY_SIZE;
2789 base_got = htab->elf.igotplt;
2792 if (h->dynindx == -1
2796 /* This references the local defitionion. We must
2797 initialize this entry in the global offset table.
2798 Since the offset must always be a multiple of 8,
2799 we use the least significant bit to record
2800 whether we have initialized it already.
2802 When doing a dynamic link, we create a .rela.got
2803 relocation entry to initialize the value. This
2804 is done in the finish_dynamic_symbol routine. */
2809 bfd_put_64 (output_bfd, relocation,
2810 base_got->contents + off);
2811 /* Note that this is harmless for the GOTPLT64
2812 case, as -1 | 1 still is -1. */
2818 relocation = (base_got->output_section->vma
2819 + base_got->output_offset + off);
2821 if (r_type != R_X86_64_GOTPCREL
2822 && r_type != R_X86_64_GOTPCREL64)
2825 if (htab->elf.splt != NULL)
2826 gotplt = htab->elf.sgotplt;
2828 gotplt = htab->elf.igotplt;
2829 relocation -= (gotplt->output_section->vma
2830 - gotplt->output_offset);
2837 /* When generating a shared object, the relocations handled here are
2838 copied into the output file to be resolved at run time. */
2841 case R_X86_64_GOT32:
2842 case R_X86_64_GOT64:
2843 /* Relocation is to the entry for this symbol in the global
2845 case R_X86_64_GOTPCREL:
2846 case R_X86_64_GOTPCREL64:
2847 /* Use global offset table entry as symbol value. */
2848 case R_X86_64_GOTPLT64:
2849 /* This is the same as GOT64 for relocation purposes, but
2850 indicates the existence of a PLT entry. The difficulty is,
2851 that we must calculate the GOT slot offset from the PLT
2852 offset, if this symbol got a PLT entry (it was global).
2853 Additionally if it's computed from the PLT entry, then that
2854 GOT offset is relative to .got.plt, not to .got. */
2855 base_got = htab->elf.sgot;
2857 if (htab->elf.sgot == NULL)
2864 off = h->got.offset;
2866 && h->plt.offset != (bfd_vma)-1
2867 && off == (bfd_vma)-1)
2869 /* We can't use h->got.offset here to save
2870 state, or even just remember the offset, as
2871 finish_dynamic_symbol would use that as offset into
2873 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2874 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2875 base_got = htab->elf.sgotplt;
2878 dyn = htab->elf.dynamic_sections_created;
2880 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2882 && SYMBOL_REFERENCES_LOCAL (info, h))
2883 || (ELF_ST_VISIBILITY (h->other)
2884 && h->root.type == bfd_link_hash_undefweak))
2886 /* This is actually a static link, or it is a -Bsymbolic
2887 link and the symbol is defined locally, or the symbol
2888 was forced to be local because of a version file. We
2889 must initialize this entry in the global offset table.
2890 Since the offset must always be a multiple of 8, we
2891 use the least significant bit to record whether we
2892 have initialized it already.
2894 When doing a dynamic link, we create a .rela.got
2895 relocation entry to initialize the value. This is
2896 done in the finish_dynamic_symbol routine. */
2901 bfd_put_64 (output_bfd, relocation,
2902 base_got->contents + off);
2903 /* Note that this is harmless for the GOTPLT64 case,
2904 as -1 | 1 still is -1. */
2909 unresolved_reloc = FALSE;
2913 if (local_got_offsets == NULL)
2916 off = local_got_offsets[r_symndx];
2918 /* The offset must always be a multiple of 8. We use
2919 the least significant bit to record whether we have
2920 already generated the necessary reloc. */
2925 bfd_put_64 (output_bfd, relocation,
2926 base_got->contents + off);
2931 Elf_Internal_Rela outrel;
2934 /* We need to generate a R_X86_64_RELATIVE reloc
2935 for the dynamic linker. */
2936 s = htab->elf.srelgot;
2940 outrel.r_offset = (base_got->output_section->vma
2941 + base_got->output_offset
2943 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2944 outrel.r_addend = relocation;
2946 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2947 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2950 local_got_offsets[r_symndx] |= 1;
2954 if (off >= (bfd_vma) -2)
2957 relocation = base_got->output_section->vma
2958 + base_got->output_offset + off;
2959 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
2960 relocation -= htab->elf.sgotplt->output_section->vma
2961 - htab->elf.sgotplt->output_offset;
2965 case R_X86_64_GOTOFF64:
2966 /* Relocation is relative to the start of the global offset
2969 /* Check to make sure it isn't a protected function symbol
2970 for shared library since it may not be local when used
2971 as function address. */
2975 && h->type == STT_FUNC
2976 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2978 (*_bfd_error_handler)
2979 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
2980 input_bfd, h->root.root.string);
2981 bfd_set_error (bfd_error_bad_value);
2985 /* Note that sgot is not involved in this
2986 calculation. We always want the start of .got.plt. If we
2987 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2988 permitted by the ABI, we might have to change this
2990 relocation -= htab->elf.sgotplt->output_section->vma
2991 + htab->elf.sgotplt->output_offset;
2994 case R_X86_64_GOTPC32:
2995 case R_X86_64_GOTPC64:
2996 /* Use global offset table as symbol value. */
2997 relocation = htab->elf.sgotplt->output_section->vma
2998 + htab->elf.sgotplt->output_offset;
2999 unresolved_reloc = FALSE;
3002 case R_X86_64_PLTOFF64:
3003 /* Relocation is PLT entry relative to GOT. For local
3004 symbols it's the symbol itself relative to GOT. */
3006 /* See PLT32 handling. */
3007 && h->plt.offset != (bfd_vma) -1
3008 && htab->elf.splt != NULL)
3010 relocation = (htab->elf.splt->output_section->vma
3011 + htab->elf.splt->output_offset
3013 unresolved_reloc = FALSE;
3016 relocation -= htab->elf.sgotplt->output_section->vma
3017 + htab->elf.sgotplt->output_offset;
3020 case R_X86_64_PLT32:
3021 /* Relocation is to the entry for this symbol in the
3022 procedure linkage table. */
3024 /* Resolve a PLT32 reloc against a local symbol directly,
3025 without using the procedure linkage table. */
3029 if (h->plt.offset == (bfd_vma) -1
3030 || htab->elf.splt == NULL)
3032 /* We didn't make a PLT entry for this symbol. This
3033 happens when statically linking PIC code, or when
3034 using -Bsymbolic. */
3038 relocation = (htab->elf.splt->output_section->vma
3039 + htab->elf.splt->output_offset
3041 unresolved_reloc = FALSE;
3048 && (input_section->flags & SEC_ALLOC) != 0
3049 && (input_section->flags & SEC_READONLY) != 0
3052 bfd_boolean fail = FALSE;
3054 = (r_type == R_X86_64_PC32
3055 && is_32bit_relative_branch (contents, rel->r_offset));
3057 if (SYMBOL_REFERENCES_LOCAL (info, h))
3059 /* Symbol is referenced locally. Make sure it is
3060 defined locally or for a branch. */
3061 fail = !h->def_regular && !branch;
3065 /* Symbol isn't referenced locally. We only allow
3066 branch to symbol with non-default visibility. */
3068 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3075 const char *pic = "";
3077 switch (ELF_ST_VISIBILITY (h->other))
3080 v = _("hidden symbol");
3083 v = _("internal symbol");
3086 v = _("protected symbol");
3090 pic = _("; recompile with -fPIC");
3095 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3097 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3099 (*_bfd_error_handler) (fmt, input_bfd,
3100 x86_64_elf_howto_table[r_type].name,
3101 v, h->root.root.string, pic);
3102 bfd_set_error (bfd_error_bad_value);
3113 /* FIXME: The ABI says the linker should make sure the value is
3114 the same when it's zeroextended to 64 bit. */
3116 if ((input_section->flags & SEC_ALLOC) == 0)
3121 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3122 || h->root.type != bfd_link_hash_undefweak)
3123 && (! IS_X86_64_PCREL_TYPE (r_type)
3124 || ! SYMBOL_CALLS_LOCAL (info, h)))
3125 || (ELIMINATE_COPY_RELOCS
3132 || h->root.type == bfd_link_hash_undefweak
3133 || h->root.type == bfd_link_hash_undefined)))
3135 Elf_Internal_Rela outrel;
3137 bfd_boolean skip, relocate;
3140 /* When generating a shared object, these relocations
3141 are copied into the output file to be resolved at run
3147 _bfd_elf_section_offset (output_bfd, info, input_section,
3149 if (outrel.r_offset == (bfd_vma) -1)
3151 else if (outrel.r_offset == (bfd_vma) -2)
3152 skip = TRUE, relocate = TRUE;
3154 outrel.r_offset += (input_section->output_section->vma
3155 + input_section->output_offset);
3158 memset (&outrel, 0, sizeof outrel);
3160 /* h->dynindx may be -1 if this symbol was marked to
3164 && (IS_X86_64_PCREL_TYPE (r_type)
3166 || ! SYMBOLIC_BIND (info, h)
3167 || ! h->def_regular))
3169 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
3170 outrel.r_addend = rel->r_addend;
3174 /* This symbol is local, or marked to become local. */
3175 if (r_type == R_X86_64_64)
3178 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3179 outrel.r_addend = relocation + rel->r_addend;
3185 if (bfd_is_abs_section (sec))
3187 else if (sec == NULL || sec->owner == NULL)
3189 bfd_set_error (bfd_error_bad_value);
3196 /* We are turning this relocation into one
3197 against a section symbol. It would be
3198 proper to subtract the symbol's value,
3199 osec->vma, from the emitted reloc addend,
3200 but ld.so expects buggy relocs. */
3201 osec = sec->output_section;
3202 sindx = elf_section_data (osec)->dynindx;
3205 asection *oi = htab->elf.text_index_section;
3206 sindx = elf_section_data (oi)->dynindx;
3208 BFD_ASSERT (sindx != 0);
3211 outrel.r_info = ELF64_R_INFO (sindx, r_type);
3212 outrel.r_addend = relocation + rel->r_addend;
3216 sreloc = elf_section_data (input_section)->sreloc;
3218 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3220 loc = sreloc->contents;
3221 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3222 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3224 /* If this reloc is against an external symbol, we do
3225 not want to fiddle with the addend. Otherwise, we
3226 need to include the symbol value so that it becomes
3227 an addend for the dynamic reloc. */
3234 case R_X86_64_TLSGD:
3235 case R_X86_64_GOTPC32_TLSDESC:
3236 case R_X86_64_TLSDESC_CALL:
3237 case R_X86_64_GOTTPOFF:
3238 tls_type = GOT_UNKNOWN;
3239 if (h == NULL && local_got_offsets)
3240 tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3242 tls_type = elf64_x86_64_hash_entry (h)->tls_type;
3244 if (! elf64_x86_64_tls_transition (info, input_bfd,
3245 input_section, contents,
3246 symtab_hdr, sym_hashes,
3247 &r_type, tls_type, rel,
3248 relend, h, r_symndx))
3251 if (r_type == R_X86_64_TPOFF32)
3253 bfd_vma roff = rel->r_offset;
3255 BFD_ASSERT (! unresolved_reloc);
3257 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3259 /* GD->LE transition.
3260 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3261 .word 0x6666; rex64; call __tls_get_addr
3264 leaq foo@tpoff(%rax), %rax */
3265 memcpy (contents + roff - 4,
3266 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3268 bfd_put_32 (output_bfd,
3269 elf64_x86_64_tpoff (info, relocation),
3270 contents + roff + 8);
3271 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3275 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3277 /* GDesc -> LE transition.
3278 It's originally something like:
3279 leaq x@tlsdesc(%rip), %rax
3285 unsigned int val, type, type2;
3287 type = bfd_get_8 (input_bfd, contents + roff - 3);
3288 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
3289 val = bfd_get_8 (input_bfd, contents + roff - 1);
3290 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3291 contents + roff - 3);
3292 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3293 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3294 contents + roff - 1);
3295 bfd_put_32 (output_bfd,
3296 elf64_x86_64_tpoff (info, relocation),
3300 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3302 /* GDesc -> LE transition.
3307 bfd_put_8 (output_bfd, 0x66, contents + roff);
3308 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3311 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3313 /* IE->LE transition:
3314 Originally it can be one of:
3315 movq foo@gottpoff(%rip), %reg
3316 addq foo@gottpoff(%rip), %reg
3319 leaq foo(%reg), %reg
3322 unsigned int val, type, reg;
3324 val = bfd_get_8 (input_bfd, contents + roff - 3);
3325 type = bfd_get_8 (input_bfd, contents + roff - 2);
3326 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3332 bfd_put_8 (output_bfd, 0x49,
3333 contents + roff - 3);
3334 bfd_put_8 (output_bfd, 0xc7,
3335 contents + roff - 2);
3336 bfd_put_8 (output_bfd, 0xc0 | reg,
3337 contents + roff - 1);
3341 /* addq -> addq - addressing with %rsp/%r12 is
3344 bfd_put_8 (output_bfd, 0x49,
3345 contents + roff - 3);
3346 bfd_put_8 (output_bfd, 0x81,
3347 contents + roff - 2);
3348 bfd_put_8 (output_bfd, 0xc0 | reg,
3349 contents + roff - 1);
3355 bfd_put_8 (output_bfd, 0x4d,
3356 contents + roff - 3);
3357 bfd_put_8 (output_bfd, 0x8d,
3358 contents + roff - 2);
3359 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3360 contents + roff - 1);
3362 bfd_put_32 (output_bfd,
3363 elf64_x86_64_tpoff (info, relocation),
3371 if (htab->elf.sgot == NULL)
3376 off = h->got.offset;
3377 offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got;
3381 if (local_got_offsets == NULL)
3384 off = local_got_offsets[r_symndx];
3385 offplt = local_tlsdesc_gotents[r_symndx];
3392 Elf_Internal_Rela outrel;
3397 if (htab->elf.srelgot == NULL)
3400 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3402 if (GOT_TLS_GDESC_P (tls_type))
3404 outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC);
3405 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3406 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3407 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3408 + htab->elf.sgotplt->output_offset
3410 + htab->sgotplt_jump_table_size);
3411 sreloc = htab->elf.srelplt;
3412 loc = sreloc->contents;
3413 loc += sreloc->reloc_count++
3414 * sizeof (Elf64_External_Rela);
3415 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3416 <= sreloc->contents + sreloc->size);
3418 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3420 outrel.r_addend = 0;
3421 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3424 sreloc = htab->elf.srelgot;
3426 outrel.r_offset = (htab->elf.sgot->output_section->vma
3427 + htab->elf.sgot->output_offset + off);
3429 if (GOT_TLS_GD_P (tls_type))
3430 dr_type = R_X86_64_DTPMOD64;
3431 else if (GOT_TLS_GDESC_P (tls_type))
3434 dr_type = R_X86_64_TPOFF64;
3436 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3437 outrel.r_addend = 0;
3438 if ((dr_type == R_X86_64_TPOFF64
3439 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3440 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3441 outrel.r_info = ELF64_R_INFO (indx, dr_type);
3443 loc = sreloc->contents;
3444 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3445 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3446 <= sreloc->contents + sreloc->size);
3447 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3449 if (GOT_TLS_GD_P (tls_type))
3453 BFD_ASSERT (! unresolved_reloc);
3454 bfd_put_64 (output_bfd,
3455 relocation - elf64_x86_64_dtpoff_base (info),
3456 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3460 bfd_put_64 (output_bfd, 0,
3461 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3462 outrel.r_info = ELF64_R_INFO (indx,
3464 outrel.r_offset += GOT_ENTRY_SIZE;
3465 sreloc->reloc_count++;
3466 loc += sizeof (Elf64_External_Rela);
3467 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3468 <= sreloc->contents + sreloc->size);
3469 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3477 local_got_offsets[r_symndx] |= 1;
3480 if (off >= (bfd_vma) -2
3481 && ! GOT_TLS_GDESC_P (tls_type))
3483 if (r_type == ELF64_R_TYPE (rel->r_info))
3485 if (r_type == R_X86_64_GOTPC32_TLSDESC
3486 || r_type == R_X86_64_TLSDESC_CALL)
3487 relocation = htab->elf.sgotplt->output_section->vma
3488 + htab->elf.sgotplt->output_offset
3489 + offplt + htab->sgotplt_jump_table_size;
3491 relocation = htab->elf.sgot->output_section->vma
3492 + htab->elf.sgot->output_offset + off;
3493 unresolved_reloc = FALSE;
3497 bfd_vma roff = rel->r_offset;
3499 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3501 /* GD->IE transition.
3502 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3503 .word 0x6666; rex64; call __tls_get_addr@plt
3506 addq foo@gottpoff(%rip), %rax */
3507 memcpy (contents + roff - 4,
3508 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3511 relocation = (htab->elf.sgot->output_section->vma
3512 + htab->elf.sgot->output_offset + off
3514 - input_section->output_section->vma
3515 - input_section->output_offset
3517 bfd_put_32 (output_bfd, relocation,
3518 contents + roff + 8);
3519 /* Skip R_X86_64_PLT32. */
3523 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3525 /* GDesc -> IE transition.
3526 It's originally something like:
3527 leaq x@tlsdesc(%rip), %rax
3530 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3533 unsigned int val, type, type2;
3535 type = bfd_get_8 (input_bfd, contents + roff - 3);
3536 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
3537 val = bfd_get_8 (input_bfd, contents + roff - 1);
3539 /* Now modify the instruction as appropriate. To
3540 turn a leaq into a movq in the form we use it, it
3541 suffices to change the second byte from 0x8d to
3543 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3545 bfd_put_32 (output_bfd,
3546 htab->elf.sgot->output_section->vma
3547 + htab->elf.sgot->output_offset + off
3549 - input_section->output_section->vma
3550 - input_section->output_offset
3555 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3557 /* GDesc -> IE transition.
3564 unsigned int val, type;
3566 type = bfd_get_8 (input_bfd, contents + roff);
3567 val = bfd_get_8 (input_bfd, contents + roff + 1);
3568 bfd_put_8 (output_bfd, 0x66, contents + roff);
3569 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3577 case R_X86_64_TLSLD:
3578 if (! elf64_x86_64_tls_transition (info, input_bfd,
3579 input_section, contents,
3580 symtab_hdr, sym_hashes,
3581 &r_type, GOT_UNKNOWN,
3582 rel, relend, h, r_symndx))
3585 if (r_type != R_X86_64_TLSLD)
3587 /* LD->LE transition:
3588 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3590 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3592 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3593 memcpy (contents + rel->r_offset - 3,
3594 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3595 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3600 if (htab->elf.sgot == NULL)
3603 off = htab->tls_ld_got.offset;
3608 Elf_Internal_Rela outrel;
3611 if (htab->elf.srelgot == NULL)
3614 outrel.r_offset = (htab->elf.sgot->output_section->vma
3615 + htab->elf.sgot->output_offset + off);
3617 bfd_put_64 (output_bfd, 0,
3618 htab->elf.sgot->contents + off);
3619 bfd_put_64 (output_bfd, 0,
3620 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3621 outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
3622 outrel.r_addend = 0;
3623 loc = htab->elf.srelgot->contents;
3624 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3625 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3626 htab->tls_ld_got.offset |= 1;
3628 relocation = htab->elf.sgot->output_section->vma
3629 + htab->elf.sgot->output_offset + off;
3630 unresolved_reloc = FALSE;
3633 case R_X86_64_DTPOFF32:
3634 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3635 relocation -= elf64_x86_64_dtpoff_base (info);
3637 relocation = elf64_x86_64_tpoff (info, relocation);
3640 case R_X86_64_TPOFF32:
3641 BFD_ASSERT (! info->shared);
3642 relocation = elf64_x86_64_tpoff (info, relocation);
3649 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3650 because such sections are not SEC_ALLOC and thus ld.so will
3651 not process them. */
3652 if (unresolved_reloc
3653 && !((input_section->flags & SEC_DEBUGGING) != 0
3655 (*_bfd_error_handler)
3656 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3659 (long) rel->r_offset,
3661 h->root.root.string);
3664 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3665 contents, rel->r_offset,
3666 relocation, rel->r_addend);
3668 if (r != bfd_reloc_ok)
3673 name = h->root.root.string;
3676 name = bfd_elf_string_from_elf_section (input_bfd,
3677 symtab_hdr->sh_link,
3682 name = bfd_section_name (input_bfd, sec);
3685 if (r == bfd_reloc_overflow)
3687 if (! ((*info->callbacks->reloc_overflow)
3688 (info, (h ? &h->root : NULL), name, howto->name,
3689 (bfd_vma) 0, input_bfd, input_section,
3695 (*_bfd_error_handler)
3696 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3697 input_bfd, input_section,
3698 (long) rel->r_offset, name, (int) r);
3707 /* Finish up dynamic symbol handling. We set the contents of various
3708 dynamic sections here. */
3711 elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3712 struct bfd_link_info *info,
3713 struct elf_link_hash_entry *h,
3714 Elf_Internal_Sym *sym)
3716 struct elf64_x86_64_link_hash_table *htab;
3718 htab = elf64_x86_64_hash_table (info);
3720 if (h->plt.offset != (bfd_vma) -1)
3724 Elf_Internal_Rela rela;
3726 asection *plt, *gotplt, *relplt;
3728 /* When building a static executable, use .iplt, .igot.plt and
3729 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3730 if (htab->elf.splt != NULL)
3732 plt = htab->elf.splt;
3733 gotplt = htab->elf.sgotplt;
3734 relplt = htab->elf.srelplt;
3738 plt = htab->elf.iplt;
3739 gotplt = htab->elf.igotplt;
3740 relplt = htab->elf.irelplt;
3743 /* This symbol has an entry in the procedure linkage table. Set
3745 if ((h->dynindx == -1
3746 && !((h->forced_local || info->executable)
3748 && h->type == STT_GNU_IFUNC))
3754 /* Get the index in the procedure linkage table which
3755 corresponds to this symbol. This is the index of this symbol
3756 in all the symbols for which we are making plt entries. The
3757 first entry in the procedure linkage table is reserved.
3759 Get the offset into the .got table of the entry that
3760 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3761 bytes. The first three are reserved for the dynamic linker.
3763 For static executables, we don't reserve anything. */
3765 if (plt == htab->elf.splt)
3767 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3768 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3772 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3773 got_offset = plt_index * GOT_ENTRY_SIZE;
3776 /* Fill in the entry in the procedure linkage table. */
3777 memcpy (plt->contents + h->plt.offset, elf64_x86_64_plt_entry,
3780 /* Insert the relocation positions of the plt section. The magic
3781 numbers at the end of the statements are the positions of the
3782 relocations in the plt section. */
3783 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3784 instruction uses 6 bytes, subtract this value. */
3785 bfd_put_32 (output_bfd,
3786 (gotplt->output_section->vma
3787 + gotplt->output_offset
3789 - plt->output_section->vma
3790 - plt->output_offset
3793 plt->contents + h->plt.offset + 2);
3795 /* Don't fill PLT entry for static executables. */
3796 if (plt == htab->elf.splt)
3798 /* Put relocation index. */
3799 bfd_put_32 (output_bfd, plt_index,
3800 plt->contents + h->plt.offset + 7);
3801 /* Put offset for jmp .PLT0. */
3802 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3803 plt->contents + h->plt.offset + 12);
3806 /* Fill in the entry in the global offset table, initially this
3807 points to the pushq instruction in the PLT which is at offset 6. */
3808 bfd_put_64 (output_bfd, (plt->output_section->vma
3809 + plt->output_offset
3810 + h->plt.offset + 6),
3811 gotplt->contents + got_offset);
3813 /* Fill in the entry in the .rela.plt section. */
3814 rela.r_offset = (gotplt->output_section->vma
3815 + gotplt->output_offset
3817 if (h->dynindx == -1
3818 || ((info->executable
3819 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3821 && h->type == STT_GNU_IFUNC))
3823 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3824 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3825 rela.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
3826 rela.r_addend = (h->root.u.def.value
3827 + h->root.u.def.section->output_section->vma
3828 + h->root.u.def.section->output_offset);
3832 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
3835 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3836 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3838 if (!h->def_regular)
3840 /* Mark the symbol as undefined, rather than as defined in
3841 the .plt section. Leave the value if there were any
3842 relocations where pointer equality matters (this is a clue
3843 for the dynamic linker, to make function pointer
3844 comparisons work between an application and shared
3845 library), otherwise set it to zero. If a function is only
3846 called from a binary, there is no need to slow down
3847 shared libraries because of that. */
3848 sym->st_shndx = SHN_UNDEF;
3849 if (!h->pointer_equality_needed)
3854 if (h->got.offset != (bfd_vma) -1
3855 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type)
3856 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
3858 Elf_Internal_Rela rela;
3861 /* This symbol has an entry in the global offset table. Set it
3863 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3866 rela.r_offset = (htab->elf.sgot->output_section->vma
3867 + htab->elf.sgot->output_offset
3868 + (h->got.offset &~ (bfd_vma) 1));
3870 /* If this is a static link, or it is a -Bsymbolic link and the
3871 symbol is defined locally or was forced to be local because
3872 of a version file, we just want to emit a RELATIVE reloc.
3873 The entry in the global offset table will already have been
3874 initialized in the relocate_section function. */
3876 && h->type == STT_GNU_IFUNC)
3880 /* Generate R_X86_64_GLOB_DAT. */
3885 if (!h->pointer_equality_needed)
3888 /* For non-shared object, we can't use .got.plt, which
3889 contains the real function addres if we need pointer
3890 equality. We load the GOT entry with the PLT entry. */
3891 asection *plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3892 bfd_put_64 (output_bfd, (plt->output_section->vma
3893 + plt->output_offset
3895 htab->elf.sgot->contents + h->got.offset);
3899 else if (info->shared
3900 && SYMBOL_REFERENCES_LOCAL (info, h))
3902 if (!h->def_regular)
3904 BFD_ASSERT((h->got.offset & 1) != 0);
3905 rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3906 rela.r_addend = (h->root.u.def.value
3907 + h->root.u.def.section->output_section->vma
3908 + h->root.u.def.section->output_offset);
3912 BFD_ASSERT((h->got.offset & 1) == 0);
3914 bfd_put_64 (output_bfd, (bfd_vma) 0,
3915 htab->elf.sgot->contents + h->got.offset);
3916 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
3920 loc = htab->elf.srelgot->contents;
3921 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3922 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3927 Elf_Internal_Rela rela;
3930 /* This symbol needs a copy reloc. Set it up. */
3932 if (h->dynindx == -1
3933 || (h->root.type != bfd_link_hash_defined
3934 && h->root.type != bfd_link_hash_defweak)
3935 || htab->srelbss == NULL)
3938 rela.r_offset = (h->root.u.def.value
3939 + h->root.u.def.section->output_section->vma
3940 + h->root.u.def.section->output_offset);
3941 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
3943 loc = htab->srelbss->contents;
3944 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3945 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3948 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
3949 be NULL for local symbols. */
3951 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
3952 || h == htab->elf.hgot))
3953 sym->st_shndx = SHN_ABS;
3958 /* Finish up local dynamic symbol handling. We set the contents of
3959 various dynamic sections here. */
3962 elf64_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
3964 struct elf_link_hash_entry *h
3965 = (struct elf_link_hash_entry *) *slot;
3966 struct bfd_link_info *info
3967 = (struct bfd_link_info *) inf;
3969 return elf64_x86_64_finish_dynamic_symbol (info->output_bfd,
3973 /* Used to decide how to sort relocs in an optimal manner for the
3974 dynamic linker, before writing them out. */
3976 static enum elf_reloc_type_class
3977 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
3979 switch ((int) ELF64_R_TYPE (rela->r_info))
3981 case R_X86_64_RELATIVE:
3982 return reloc_class_relative;
3983 case R_X86_64_JUMP_SLOT:
3984 return reloc_class_plt;
3986 return reloc_class_copy;
3988 return reloc_class_normal;
3992 /* Finish up the dynamic sections. */
3995 elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3997 struct elf64_x86_64_link_hash_table *htab;
4001 htab = elf64_x86_64_hash_table (info);
4002 dynobj = htab->elf.dynobj;
4003 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4005 if (htab->elf.dynamic_sections_created)
4007 Elf64_External_Dyn *dyncon, *dynconend;
4009 if (sdyn == NULL || htab->elf.sgot == NULL)
4012 dyncon = (Elf64_External_Dyn *) sdyn->contents;
4013 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
4014 for (; dyncon < dynconend; dyncon++)
4016 Elf_Internal_Dyn dyn;
4019 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
4027 s = htab->elf.sgotplt;
4028 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4032 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4036 s = htab->elf.srelplt->output_section;
4037 dyn.d_un.d_val = s->size;
4041 /* The procedure linkage table relocs (DT_JMPREL) should
4042 not be included in the overall relocs (DT_RELA).
4043 Therefore, we override the DT_RELASZ entry here to
4044 make it not include the JMPREL relocs. Since the
4045 linker script arranges for .rela.plt to follow all
4046 other relocation sections, we don't have to worry
4047 about changing the DT_RELA entry. */
4048 if (htab->elf.srelplt != NULL)
4050 s = htab->elf.srelplt->output_section;
4051 dyn.d_un.d_val -= s->size;
4055 case DT_TLSDESC_PLT:
4057 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4058 + htab->tlsdesc_plt;
4061 case DT_TLSDESC_GOT:
4063 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4064 + htab->tlsdesc_got;
4068 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
4071 /* Fill in the special first entry in the procedure linkage table. */
4072 if (htab->elf.splt && htab->elf.splt->size > 0)
4074 /* Fill in the first entry in the procedure linkage table. */
4075 memcpy (htab->elf.splt->contents, elf64_x86_64_plt0_entry,
4077 /* Add offset for pushq GOT+8(%rip), since the instruction
4078 uses 6 bytes subtract this value. */
4079 bfd_put_32 (output_bfd,
4080 (htab->elf.sgotplt->output_section->vma
4081 + htab->elf.sgotplt->output_offset
4083 - htab->elf.splt->output_section->vma
4084 - htab->elf.splt->output_offset
4086 htab->elf.splt->contents + 2);
4087 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4088 the end of the instruction. */
4089 bfd_put_32 (output_bfd,
4090 (htab->elf.sgotplt->output_section->vma
4091 + htab->elf.sgotplt->output_offset
4093 - htab->elf.splt->output_section->vma
4094 - htab->elf.splt->output_offset
4096 htab->elf.splt->contents + 8);
4098 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize =
4101 if (htab->tlsdesc_plt)
4103 bfd_put_64 (output_bfd, (bfd_vma) 0,
4104 htab->elf.sgot->contents + htab->tlsdesc_got);
4106 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4107 elf64_x86_64_plt0_entry,
4110 /* Add offset for pushq GOT+8(%rip), since the
4111 instruction uses 6 bytes subtract this value. */
4112 bfd_put_32 (output_bfd,
4113 (htab->elf.sgotplt->output_section->vma
4114 + htab->elf.sgotplt->output_offset
4116 - htab->elf.splt->output_section->vma
4117 - htab->elf.splt->output_offset
4120 htab->elf.splt->contents + htab->tlsdesc_plt + 2);
4121 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4122 htab->tlsdesc_got. The 12 is the offset to the end of
4124 bfd_put_32 (output_bfd,
4125 (htab->elf.sgot->output_section->vma
4126 + htab->elf.sgot->output_offset
4128 - htab->elf.splt->output_section->vma
4129 - htab->elf.splt->output_offset
4132 htab->elf.splt->contents + htab->tlsdesc_plt + 8);
4137 if (htab->elf.sgotplt)
4139 /* Fill in the first three entries in the global offset table. */
4140 if (htab->elf.sgotplt->size > 0)
4142 /* Set the first entry in the global offset table to the address of
4143 the dynamic section. */
4145 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4147 bfd_put_64 (output_bfd,
4148 sdyn->output_section->vma + sdyn->output_offset,
4149 htab->elf.sgotplt->contents);
4150 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4151 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4152 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4155 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4159 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4160 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4163 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4164 htab_traverse (htab->loc_hash_table,
4165 elf64_x86_64_finish_local_dynamic_symbol,
4171 /* Return address for Ith PLT stub in section PLT, for relocation REL
4172 or (bfd_vma) -1 if it should not be included. */
4175 elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4176 const arelent *rel ATTRIBUTE_UNUSED)
4178 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4181 /* Handle an x86-64 specific section when reading an object file. This
4182 is called when elfcode.h finds a section with an unknown type. */
4185 elf64_x86_64_section_from_shdr (bfd *abfd,
4186 Elf_Internal_Shdr *hdr,
4190 if (hdr->sh_type != SHT_X86_64_UNWIND)
4193 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4199 /* Hook called by the linker routine which adds symbols from an object
4200 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4204 elf64_x86_64_add_symbol_hook (bfd *abfd,
4205 struct bfd_link_info *info,
4206 Elf_Internal_Sym *sym,
4207 const char **namep ATTRIBUTE_UNUSED,
4208 flagword *flagsp ATTRIBUTE_UNUSED,
4214 switch (sym->st_shndx)
4216 case SHN_X86_64_LCOMMON:
4217 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4220 lcomm = bfd_make_section_with_flags (abfd,
4224 | SEC_LINKER_CREATED));
4227 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4230 *valp = sym->st_size;
4234 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4235 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4241 /* Given a BFD section, try to locate the corresponding ELF section
4245 elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4246 asection *sec, int *index)
4248 if (sec == &_bfd_elf_large_com_section)
4250 *index = SHN_X86_64_LCOMMON;
4256 /* Process a symbol. */
4259 elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4262 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4264 switch (elfsym->internal_elf_sym.st_shndx)
4266 case SHN_X86_64_LCOMMON:
4267 asym->section = &_bfd_elf_large_com_section;
4268 asym->value = elfsym->internal_elf_sym.st_size;
4269 /* Common symbol doesn't set BSF_GLOBAL. */
4270 asym->flags &= ~BSF_GLOBAL;
4276 elf64_x86_64_common_definition (Elf_Internal_Sym *sym)
4278 return (sym->st_shndx == SHN_COMMON
4279 || sym->st_shndx == SHN_X86_64_LCOMMON);
4283 elf64_x86_64_common_section_index (asection *sec)
4285 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4288 return SHN_X86_64_LCOMMON;
4292 elf64_x86_64_common_section (asection *sec)
4294 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4295 return bfd_com_section_ptr;
4297 return &_bfd_elf_large_com_section;
4301 elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4302 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4303 struct elf_link_hash_entry *h,
4304 Elf_Internal_Sym *sym,
4306 bfd_vma *pvalue ATTRIBUTE_UNUSED,
4307 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4308 bfd_boolean *skip ATTRIBUTE_UNUSED,
4309 bfd_boolean *override ATTRIBUTE_UNUSED,
4310 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4311 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4312 bfd_boolean *newdef ATTRIBUTE_UNUSED,
4313 bfd_boolean *newdyn,
4314 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4315 bfd_boolean *newweak ATTRIBUTE_UNUSED,
4316 bfd *abfd ATTRIBUTE_UNUSED,
4318 bfd_boolean *olddef ATTRIBUTE_UNUSED,
4319 bfd_boolean *olddyn,
4320 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4321 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
4325 /* A normal common symbol and a large common symbol result in a
4326 normal common symbol. We turn the large common symbol into a
4329 && h->root.type == bfd_link_hash_common
4331 && bfd_is_com_section (*sec)
4334 if (sym->st_shndx == SHN_COMMON
4335 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4337 h->root.u.c.p->section
4338 = bfd_make_section_old_way (oldbfd, "COMMON");
4339 h->root.u.c.p->section->flags = SEC_ALLOC;
4341 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4342 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
4343 *psec = *sec = bfd_com_section_ptr;
4350 elf64_x86_64_additional_program_headers (bfd *abfd,
4351 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4356 /* Check to see if we need a large readonly segment. */
4357 s = bfd_get_section_by_name (abfd, ".lrodata");
4358 if (s && (s->flags & SEC_LOAD))
4361 /* Check to see if we need a large data segment. Since .lbss sections
4362 is placed right after the .bss section, there should be no need for
4363 a large data segment just because of .lbss. */
4364 s = bfd_get_section_by_name (abfd, ".ldata");
4365 if (s && (s->flags & SEC_LOAD))
4371 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4374 elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4376 if (h->plt.offset != (bfd_vma) -1
4378 && !h->pointer_equality_needed)
4381 return _bfd_elf_hash_symbol (h);
4384 static const struct bfd_elf_special_section
4385 elf64_x86_64_special_sections[]=
4387 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4388 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4389 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4390 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4391 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4392 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4393 { NULL, 0, 0, 0, 0 }
4396 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4397 #define TARGET_LITTLE_NAME "elf64-x86-64"
4398 #define ELF_ARCH bfd_arch_i386
4399 #define ELF_MACHINE_CODE EM_X86_64
4400 #define ELF_MAXPAGESIZE 0x200000
4401 #define ELF_MINPAGESIZE 0x1000
4402 #define ELF_COMMONPAGESIZE 0x1000
4404 #define elf_backend_can_gc_sections 1
4405 #define elf_backend_can_refcount 1
4406 #define elf_backend_want_got_plt 1
4407 #define elf_backend_plt_readonly 1
4408 #define elf_backend_want_plt_sym 0
4409 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4410 #define elf_backend_rela_normal 1
4412 #define elf_info_to_howto elf64_x86_64_info_to_howto
4414 #define bfd_elf64_bfd_link_hash_table_create \
4415 elf64_x86_64_link_hash_table_create
4416 #define bfd_elf64_bfd_link_hash_table_free \
4417 elf64_x86_64_link_hash_table_free
4418 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
4419 #define bfd_elf64_bfd_reloc_name_lookup \
4420 elf64_x86_64_reloc_name_lookup
4422 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
4423 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4424 #define elf_backend_check_relocs elf64_x86_64_check_relocs
4425 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4426 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4427 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4428 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4429 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4430 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
4431 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4432 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
4433 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
4434 #define elf_backend_relocate_section elf64_x86_64_relocate_section
4435 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
4436 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
4437 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4438 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
4439 #define elf_backend_object_p elf64_x86_64_elf_object_p
4440 #define bfd_elf64_mkobject elf64_x86_64_mkobject
4442 #define elf_backend_section_from_shdr \
4443 elf64_x86_64_section_from_shdr
4445 #define elf_backend_section_from_bfd_section \
4446 elf64_x86_64_elf_section_from_bfd_section
4447 #define elf_backend_add_symbol_hook \
4448 elf64_x86_64_add_symbol_hook
4449 #define elf_backend_symbol_processing \
4450 elf64_x86_64_symbol_processing
4451 #define elf_backend_common_section_index \
4452 elf64_x86_64_common_section_index
4453 #define elf_backend_common_section \
4454 elf64_x86_64_common_section
4455 #define elf_backend_common_definition \
4456 elf64_x86_64_common_definition
4457 #define elf_backend_merge_symbol \
4458 elf64_x86_64_merge_symbol
4459 #define elf_backend_special_sections \
4460 elf64_x86_64_special_sections
4461 #define elf_backend_additional_program_headers \
4462 elf64_x86_64_additional_program_headers
4463 #define elf_backend_hash_symbol \
4464 elf64_x86_64_hash_symbol
4466 #undef elf_backend_post_process_headers
4467 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4469 #include "elf64-target.h"
4471 /* FreeBSD support. */
4473 #undef TARGET_LITTLE_SYM
4474 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4475 #undef TARGET_LITTLE_NAME
4476 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4479 #define ELF_OSABI ELFOSABI_FREEBSD
4482 #define elf64_bed elf64_x86_64_fbsd_bed
4484 #include "elf64-target.h"