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)
942 unsigned int from_type = *r_type;
943 unsigned int to_type = from_type;
944 bfd_boolean check = TRUE;
949 case R_X86_64_GOTPC32_TLSDESC:
950 case R_X86_64_TLSDESC_CALL:
951 case R_X86_64_GOTTPOFF:
955 to_type = R_X86_64_TPOFF32;
957 to_type = R_X86_64_GOTTPOFF;
960 /* When we are called from elf64_x86_64_relocate_section,
961 CONTENTS isn't NULL and there may be additional transitions
962 based on TLS_TYPE. */
963 if (contents != NULL)
965 unsigned int new_to_type = to_type;
970 && tls_type == GOT_TLS_IE)
971 new_to_type = R_X86_64_TPOFF32;
973 if (to_type == R_X86_64_TLSGD
974 || to_type == R_X86_64_GOTPC32_TLSDESC
975 || to_type == R_X86_64_TLSDESC_CALL)
977 if (tls_type == GOT_TLS_IE)
978 new_to_type = R_X86_64_GOTTPOFF;
981 /* We checked the transition before when we were called from
982 elf64_x86_64_check_relocs. We only want to check the new
983 transition which hasn't been checked before. */
984 check = new_to_type != to_type && from_type == to_type;
985 to_type = new_to_type;
992 to_type = R_X86_64_TPOFF32;
999 /* Return TRUE if there is no transition. */
1000 if (from_type == to_type)
1003 /* Check if the transition can be performed. */
1005 && ! elf64_x86_64_check_tls_transition (abfd, sec, contents,
1006 symtab_hdr, sym_hashes,
1007 from_type, rel, relend))
1009 reloc_howto_type *from, *to;
1011 from = elf64_x86_64_rtype_to_howto (abfd, from_type);
1012 to = elf64_x86_64_rtype_to_howto (abfd, to_type);
1014 (*_bfd_error_handler)
1015 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1016 "in section `%A' failed"),
1017 abfd, sec, from->name, to->name,
1018 h ? h->root.root.string : "a local symbol",
1019 (unsigned long) rel->r_offset);
1020 bfd_set_error (bfd_error_bad_value);
1028 /* Look through the relocs for a section during the first phase, and
1029 calculate needed space in the global offset table, procedure
1030 linkage table, and dynamic reloc sections. */
1033 elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1035 const Elf_Internal_Rela *relocs)
1037 struct elf64_x86_64_link_hash_table *htab;
1038 Elf_Internal_Shdr *symtab_hdr;
1039 struct elf_link_hash_entry **sym_hashes;
1040 const Elf_Internal_Rela *rel;
1041 const Elf_Internal_Rela *rel_end;
1043 Elf_Internal_Sym *isymbuf;
1045 if (info->relocatable)
1048 BFD_ASSERT (is_x86_64_elf (abfd));
1050 htab = elf64_x86_64_hash_table (info);
1051 symtab_hdr = &elf_symtab_hdr (abfd);
1052 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1053 sym_hashes = elf_sym_hashes (abfd);
1057 rel_end = relocs + sec->reloc_count;
1058 for (rel = relocs; rel < rel_end; rel++)
1060 unsigned int r_type;
1061 unsigned long r_symndx;
1062 struct elf_link_hash_entry *h;
1064 r_symndx = ELF64_R_SYM (rel->r_info);
1065 r_type = ELF64_R_TYPE (rel->r_info);
1067 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1069 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1074 if (r_symndx < symtab_hdr->sh_info)
1076 /* A local symbol. */
1077 Elf_Internal_Sym *isym;
1079 /* Read this BFD's local symbols. */
1080 if (isymbuf == NULL)
1082 if (isymbuf == NULL)
1083 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1084 symtab_hdr->sh_info, 0,
1086 if (isymbuf == NULL)
1090 /* Check relocation against local STT_GNU_IFUNC symbol. */
1091 isym = isymbuf + r_symndx;
1092 if (ELF64_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1094 h = elf64_x86_64_get_local_sym_hash (htab, abfd, rel,
1099 /* Fake a STT_GNU_IFUNC symbol. */
1100 h->type = STT_GNU_IFUNC;
1103 h->forced_local = 1;
1104 h->root.type = bfd_link_hash_defined;
1111 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1112 while (h->root.type == bfd_link_hash_indirect
1113 || h->root.type == bfd_link_hash_warning)
1114 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1119 /* Create the ifunc sections for static executables. If we
1120 never see an indirect function symbol nor we are building
1121 a static executable, those sections will be empty and
1122 won't appear in output. */
1133 case R_X86_64_PLT32:
1134 case R_X86_64_GOTPCREL:
1135 case R_X86_64_GOTPCREL64:
1136 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1141 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1142 it here if it is defined in a non-shared object. */
1143 if (h->type == STT_GNU_IFUNC
1146 /* It is referenced by a non-shared object. */
1149 /* STT_GNU_IFUNC symbol must go through PLT. */
1150 h->plt.refcount += 1;
1152 /* STT_GNU_IFUNC needs dynamic sections. */
1153 if (htab->elf.dynobj == NULL)
1154 htab->elf.dynobj = abfd;
1159 (*_bfd_error_handler)
1160 (_("%B: relocation %s against STT_GNU_IFUNC "
1161 "symbol `%s' isn't handled by %s"), abfd,
1162 x86_64_elf_howto_table[r_type].name,
1163 (h->root.root.string
1164 ? h->root.root.string : "a local symbol"),
1166 bfd_set_error (bfd_error_bad_value);
1171 h->pointer_equality_needed = 1;
1174 /* We must copy these reloc types into the output
1175 file. Create a reloc section in dynobj and
1176 make room for this reloc. */
1177 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1178 (abfd, info, sec, sreloc,
1179 &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs);
1190 if (r_type != R_X86_64_PC32
1191 && r_type != R_X86_64_PC64)
1192 h->pointer_equality_needed = 1;
1195 case R_X86_64_PLT32:
1198 case R_X86_64_GOTPCREL:
1199 case R_X86_64_GOTPCREL64:
1200 h->got.refcount += 1;
1201 if (htab->elf.sgot == NULL
1202 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1212 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1213 symtab_hdr, sym_hashes,
1214 &r_type, GOT_UNKNOWN,
1220 case R_X86_64_TLSLD:
1221 htab->tls_ld_got.refcount += 1;
1224 case R_X86_64_TPOFF32:
1227 (*_bfd_error_handler)
1228 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1230 x86_64_elf_howto_table[r_type].name,
1231 (h) ? h->root.root.string : "a local symbol");
1232 bfd_set_error (bfd_error_bad_value);
1237 case R_X86_64_GOTTPOFF:
1239 info->flags |= DF_STATIC_TLS;
1242 case R_X86_64_GOT32:
1243 case R_X86_64_GOTPCREL:
1244 case R_X86_64_TLSGD:
1245 case R_X86_64_GOT64:
1246 case R_X86_64_GOTPCREL64:
1247 case R_X86_64_GOTPLT64:
1248 case R_X86_64_GOTPC32_TLSDESC:
1249 case R_X86_64_TLSDESC_CALL:
1250 /* This symbol requires a global offset table entry. */
1252 int tls_type, old_tls_type;
1256 default: tls_type = GOT_NORMAL; break;
1257 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1258 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1259 case R_X86_64_GOTPC32_TLSDESC:
1260 case R_X86_64_TLSDESC_CALL:
1261 tls_type = GOT_TLS_GDESC; break;
1266 if (r_type == R_X86_64_GOTPLT64)
1268 /* This relocation indicates that we also need
1269 a PLT entry, as this is a function. We don't need
1270 a PLT entry for local symbols. */
1272 h->plt.refcount += 1;
1274 h->got.refcount += 1;
1275 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1279 bfd_signed_vma *local_got_refcounts;
1281 /* This is a global offset table entry for a local symbol. */
1282 local_got_refcounts = elf_local_got_refcounts (abfd);
1283 if (local_got_refcounts == NULL)
1287 size = symtab_hdr->sh_info;
1288 size *= sizeof (bfd_signed_vma)
1289 + sizeof (bfd_vma) + sizeof (char);
1290 local_got_refcounts = ((bfd_signed_vma *)
1291 bfd_zalloc (abfd, size));
1292 if (local_got_refcounts == NULL)
1294 elf_local_got_refcounts (abfd) = local_got_refcounts;
1295 elf64_x86_64_local_tlsdesc_gotent (abfd)
1296 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1297 elf64_x86_64_local_got_tls_type (abfd)
1298 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1300 local_got_refcounts[r_symndx] += 1;
1302 = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
1305 /* If a TLS symbol is accessed using IE at least once,
1306 there is no point to use dynamic model for it. */
1307 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1308 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1309 || tls_type != GOT_TLS_IE))
1311 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1312 tls_type = old_tls_type;
1313 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1314 && GOT_TLS_GD_ANY_P (tls_type))
1315 tls_type |= old_tls_type;
1318 (*_bfd_error_handler)
1319 (_("%B: '%s' accessed both as normal and thread local symbol"),
1320 abfd, h ? h->root.root.string : "<local>");
1325 if (old_tls_type != tls_type)
1328 elf64_x86_64_hash_entry (h)->tls_type = tls_type;
1330 elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1335 case R_X86_64_GOTOFF64:
1336 case R_X86_64_GOTPC32:
1337 case R_X86_64_GOTPC64:
1339 if (htab->elf.sgot == NULL)
1341 if (htab->elf.dynobj == NULL)
1342 htab->elf.dynobj = abfd;
1343 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1349 case R_X86_64_PLT32:
1350 /* This symbol requires a procedure linkage table entry. We
1351 actually build the entry in adjust_dynamic_symbol,
1352 because this might be a case of linking PIC code which is
1353 never referenced by a dynamic object, in which case we
1354 don't need to generate a procedure linkage table entry
1357 /* If this is a local symbol, we resolve it directly without
1358 creating a procedure linkage table entry. */
1363 h->plt.refcount += 1;
1366 case R_X86_64_PLTOFF64:
1367 /* This tries to form the 'address' of a function relative
1368 to GOT. For global symbols we need a PLT entry. */
1372 h->plt.refcount += 1;
1380 /* Let's help debug shared library creation. These relocs
1381 cannot be used in shared libs. Don't error out for
1382 sections we don't care about, such as debug sections or
1383 non-constant sections. */
1385 && (sec->flags & SEC_ALLOC) != 0
1386 && (sec->flags & SEC_READONLY) != 0)
1388 (*_bfd_error_handler)
1389 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1391 x86_64_elf_howto_table[r_type].name,
1392 (h) ? h->root.root.string : "a local symbol");
1393 bfd_set_error (bfd_error_bad_value);
1403 if (h != NULL && info->executable)
1405 /* If this reloc is in a read-only section, we might
1406 need a copy reloc. We can't check reliably at this
1407 stage whether the section is read-only, as input
1408 sections have not yet been mapped to output sections.
1409 Tentatively set the flag for now, and correct in
1410 adjust_dynamic_symbol. */
1413 /* We may need a .plt entry if the function this reloc
1414 refers to is in a shared lib. */
1415 h->plt.refcount += 1;
1416 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1417 h->pointer_equality_needed = 1;
1420 /* If we are creating a shared library, and this is a reloc
1421 against a global symbol, or a non PC relative reloc
1422 against a local symbol, then we need to copy the reloc
1423 into the shared library. However, if we are linking with
1424 -Bsymbolic, we do not need to copy a reloc against a
1425 global symbol which is defined in an object we are
1426 including in the link (i.e., DEF_REGULAR is set). At
1427 this point we have not seen all the input files, so it is
1428 possible that DEF_REGULAR is not set now but will be set
1429 later (it is never cleared). In case of a weak definition,
1430 DEF_REGULAR may be cleared later by a strong definition in
1431 a shared library. We account for that possibility below by
1432 storing information in the relocs_copied field of the hash
1433 table entry. A similar situation occurs when creating
1434 shared libraries and symbol visibility changes render the
1437 If on the other hand, we are creating an executable, we
1438 may need to keep relocations for symbols satisfied by a
1439 dynamic library if we manage to avoid copy relocs for the
1442 && (sec->flags & SEC_ALLOC) != 0
1443 && (! IS_X86_64_PCREL_TYPE (r_type)
1445 && (! SYMBOLIC_BIND (info, h)
1446 || h->root.type == bfd_link_hash_defweak
1447 || !h->def_regular))))
1448 || (ELIMINATE_COPY_RELOCS
1450 && (sec->flags & SEC_ALLOC) != 0
1452 && (h->root.type == bfd_link_hash_defweak
1453 || !h->def_regular)))
1455 struct elf_dyn_relocs *p;
1456 struct elf_dyn_relocs **head;
1458 /* We must copy these reloc types into the output file.
1459 Create a reloc section in dynobj and make room for
1463 if (htab->elf.dynobj == NULL)
1464 htab->elf.dynobj = abfd;
1466 sreloc = _bfd_elf_make_dynamic_reloc_section
1467 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1473 /* If this is a global symbol, we count the number of
1474 relocations we need for this symbol. */
1477 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
1481 /* Track dynamic relocs needed for local syms too.
1482 We really need local syms available to do this
1486 Elf_Internal_Sym *isym;
1488 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1493 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1497 /* Beware of type punned pointers vs strict aliasing
1499 vpp = &(elf_section_data (s)->local_dynrel);
1500 head = (struct elf_dyn_relocs **)vpp;
1504 if (p == NULL || p->sec != sec)
1506 bfd_size_type amt = sizeof *p;
1508 p = ((struct elf_dyn_relocs *)
1509 bfd_alloc (htab->elf.dynobj, amt));
1520 if (IS_X86_64_PCREL_TYPE (r_type))
1525 /* This relocation describes the C++ object vtable hierarchy.
1526 Reconstruct it for later use during GC. */
1527 case R_X86_64_GNU_VTINHERIT:
1528 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1532 /* This relocation describes which C++ vtable entries are actually
1533 used. Record for later use during GC. */
1534 case R_X86_64_GNU_VTENTRY:
1535 BFD_ASSERT (h != NULL);
1537 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1547 && (unsigned char *) isymbuf != symtab_hdr->contents)
1549 if (!info->keep_memory)
1553 /* Cache the symbols for elf_link_input_bfd. */
1554 symtab_hdr->contents = (unsigned char *) isymbuf;
1562 && (unsigned char *) isymbuf != symtab_hdr->contents)
1567 /* Return the section that should be marked against GC for a given
1571 elf64_x86_64_gc_mark_hook (asection *sec,
1572 struct bfd_link_info *info,
1573 Elf_Internal_Rela *rel,
1574 struct elf_link_hash_entry *h,
1575 Elf_Internal_Sym *sym)
1578 switch (ELF64_R_TYPE (rel->r_info))
1580 case R_X86_64_GNU_VTINHERIT:
1581 case R_X86_64_GNU_VTENTRY:
1585 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1588 /* Update the got entry reference counts for the section being removed. */
1591 elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1593 const Elf_Internal_Rela *relocs)
1595 Elf_Internal_Shdr *symtab_hdr;
1596 struct elf_link_hash_entry **sym_hashes;
1597 bfd_signed_vma *local_got_refcounts;
1598 const Elf_Internal_Rela *rel, *relend;
1600 if (info->relocatable)
1603 elf_section_data (sec)->local_dynrel = NULL;
1605 symtab_hdr = &elf_symtab_hdr (abfd);
1606 sym_hashes = elf_sym_hashes (abfd);
1607 local_got_refcounts = elf_local_got_refcounts (abfd);
1609 relend = relocs + sec->reloc_count;
1610 for (rel = relocs; rel < relend; rel++)
1612 unsigned long r_symndx;
1613 unsigned int r_type;
1614 struct elf_link_hash_entry *h = NULL;
1616 r_symndx = ELF64_R_SYM (rel->r_info);
1617 if (r_symndx >= symtab_hdr->sh_info)
1619 struct elf64_x86_64_link_hash_entry *eh;
1620 struct elf_dyn_relocs **pp;
1621 struct elf_dyn_relocs *p;
1623 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1624 while (h->root.type == bfd_link_hash_indirect
1625 || h->root.type == bfd_link_hash_warning)
1626 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1627 eh = (struct elf64_x86_64_link_hash_entry *) h;
1629 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1632 /* Everything must go for SEC. */
1638 r_type = ELF64_R_TYPE (rel->r_info);
1639 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1640 symtab_hdr, sym_hashes,
1641 &r_type, GOT_UNKNOWN,
1647 case R_X86_64_TLSLD:
1648 if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0)
1649 elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1;
1652 case R_X86_64_TLSGD:
1653 case R_X86_64_GOTPC32_TLSDESC:
1654 case R_X86_64_TLSDESC_CALL:
1655 case R_X86_64_GOTTPOFF:
1656 case R_X86_64_GOT32:
1657 case R_X86_64_GOTPCREL:
1658 case R_X86_64_GOT64:
1659 case R_X86_64_GOTPCREL64:
1660 case R_X86_64_GOTPLT64:
1663 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1664 h->plt.refcount -= 1;
1665 if (h->got.refcount > 0)
1666 h->got.refcount -= 1;
1668 else if (local_got_refcounts != NULL)
1670 if (local_got_refcounts[r_symndx] > 0)
1671 local_got_refcounts[r_symndx] -= 1;
1688 case R_X86_64_PLT32:
1689 case R_X86_64_PLTOFF64:
1692 if (h->plt.refcount > 0)
1693 h->plt.refcount -= 1;
1705 /* Adjust a symbol defined by a dynamic object and referenced by a
1706 regular object. The current definition is in some section of the
1707 dynamic object, but we're not including those sections. We have to
1708 change the definition to something the rest of the link can
1712 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1713 struct elf_link_hash_entry *h)
1715 struct elf64_x86_64_link_hash_table *htab;
1718 /* STT_GNU_IFUNC symbol must go through PLT. */
1719 if (h->type == STT_GNU_IFUNC)
1721 if (h->plt.refcount <= 0)
1723 h->plt.offset = (bfd_vma) -1;
1729 /* If this is a function, put it in the procedure linkage table. We
1730 will fill in the contents of the procedure linkage table later,
1731 when we know the address of the .got section. */
1732 if (h->type == STT_FUNC
1735 if (h->plt.refcount <= 0
1736 || SYMBOL_CALLS_LOCAL (info, h)
1737 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1738 && h->root.type == bfd_link_hash_undefweak))
1740 /* This case can occur if we saw a PLT32 reloc in an input
1741 file, but the symbol was never referred to by a dynamic
1742 object, or if all references were garbage collected. In
1743 such a case, we don't actually need to build a procedure
1744 linkage table, and we can just do a PC32 reloc instead. */
1745 h->plt.offset = (bfd_vma) -1;
1752 /* It's possible that we incorrectly decided a .plt reloc was
1753 needed for an R_X86_64_PC32 reloc to a non-function sym in
1754 check_relocs. We can't decide accurately between function and
1755 non-function syms in check-relocs; Objects loaded later in
1756 the link may change h->type. So fix it now. */
1757 h->plt.offset = (bfd_vma) -1;
1759 /* If this is a weak symbol, and there is a real definition, the
1760 processor independent code will have arranged for us to see the
1761 real definition first, and we can just use the same value. */
1762 if (h->u.weakdef != NULL)
1764 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1765 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1766 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1767 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1768 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1769 h->non_got_ref = h->u.weakdef->non_got_ref;
1773 /* This is a reference to a symbol defined by a dynamic object which
1774 is not a function. */
1776 /* If we are creating a shared library, we must presume that the
1777 only references to the symbol are via the global offset table.
1778 For such cases we need not do anything here; the relocations will
1779 be handled correctly by relocate_section. */
1783 /* If there are no references to this symbol that do not use the
1784 GOT, we don't need to generate a copy reloc. */
1785 if (!h->non_got_ref)
1788 /* If -z nocopyreloc was given, we won't generate them either. */
1789 if (info->nocopyreloc)
1795 if (ELIMINATE_COPY_RELOCS)
1797 struct elf64_x86_64_link_hash_entry * eh;
1798 struct elf_dyn_relocs *p;
1800 eh = (struct elf64_x86_64_link_hash_entry *) h;
1801 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1803 s = p->sec->output_section;
1804 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1808 /* If we didn't find any dynamic relocs in read-only sections, then
1809 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1819 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1820 h->root.root.string);
1824 /* We must allocate the symbol in our .dynbss section, which will
1825 become part of the .bss section of the executable. There will be
1826 an entry for this symbol in the .dynsym section. The dynamic
1827 object will contain position independent code, so all references
1828 from the dynamic object to this symbol will go through the global
1829 offset table. The dynamic linker will use the .dynsym entry to
1830 determine the address it must put in the global offset table, so
1831 both the dynamic object and the regular object will refer to the
1832 same memory location for the variable. */
1834 htab = elf64_x86_64_hash_table (info);
1836 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1837 to copy the initial value out of the dynamic object and into the
1838 runtime process image. */
1839 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1841 htab->srelbss->size += sizeof (Elf64_External_Rela);
1847 return _bfd_elf_adjust_dynamic_copy (h, s);
1850 /* Allocate space in .plt, .got and associated reloc sections for
1854 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1856 struct bfd_link_info *info;
1857 struct elf64_x86_64_link_hash_table *htab;
1858 struct elf64_x86_64_link_hash_entry *eh;
1859 struct elf_dyn_relocs *p;
1861 if (h->root.type == bfd_link_hash_indirect)
1864 if (h->root.type == bfd_link_hash_warning)
1865 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1866 eh = (struct elf64_x86_64_link_hash_entry *) h;
1868 info = (struct bfd_link_info *) inf;
1869 htab = elf64_x86_64_hash_table (info);
1871 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1872 here if it is defined and referenced in a non-shared object. */
1873 if (h->type == STT_GNU_IFUNC
1875 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
1879 else if (htab->elf.dynamic_sections_created
1880 && h->plt.refcount > 0)
1882 /* Make sure this symbol is output as a dynamic symbol.
1883 Undefined weak syms won't yet be marked as dynamic. */
1884 if (h->dynindx == -1
1885 && !h->forced_local)
1887 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1892 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1894 asection *s = htab->elf.splt;
1896 /* If this is the first .plt entry, make room for the special
1899 s->size += PLT_ENTRY_SIZE;
1901 h->plt.offset = s->size;
1903 /* If this symbol is not defined in a regular file, and we are
1904 not generating a shared library, then set the symbol to this
1905 location in the .plt. This is required to make function
1906 pointers compare as equal between the normal executable and
1907 the shared library. */
1911 h->root.u.def.section = s;
1912 h->root.u.def.value = h->plt.offset;
1915 /* Make room for this entry. */
1916 s->size += PLT_ENTRY_SIZE;
1918 /* We also need to make an entry in the .got.plt section, which
1919 will be placed in the .got section by the linker script. */
1920 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1922 /* We also need to make an entry in the .rela.plt section. */
1923 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1924 htab->elf.srelplt->reloc_count++;
1928 h->plt.offset = (bfd_vma) -1;
1934 h->plt.offset = (bfd_vma) -1;
1938 eh->tlsdesc_got = (bfd_vma) -1;
1940 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1941 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1942 if (h->got.refcount > 0
1945 && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
1947 h->got.offset = (bfd_vma) -1;
1949 else if (h->got.refcount > 0)
1953 int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1955 /* Make sure this symbol is output as a dynamic symbol.
1956 Undefined weak syms won't yet be marked as dynamic. */
1957 if (h->dynindx == -1
1958 && !h->forced_local)
1960 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1964 if (GOT_TLS_GDESC_P (tls_type))
1966 eh->tlsdesc_got = htab->elf.sgotplt->size
1967 - elf64_x86_64_compute_jump_table_size (htab);
1968 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
1969 h->got.offset = (bfd_vma) -2;
1971 if (! GOT_TLS_GDESC_P (tls_type)
1972 || GOT_TLS_GD_P (tls_type))
1975 h->got.offset = s->size;
1976 s->size += GOT_ENTRY_SIZE;
1977 if (GOT_TLS_GD_P (tls_type))
1978 s->size += GOT_ENTRY_SIZE;
1980 dyn = htab->elf.dynamic_sections_created;
1981 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1983 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1984 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1985 || tls_type == GOT_TLS_IE)
1986 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1987 else if (GOT_TLS_GD_P (tls_type))
1988 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
1989 else if (! GOT_TLS_GDESC_P (tls_type)
1990 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1991 || h->root.type != bfd_link_hash_undefweak)
1993 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1994 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1995 if (GOT_TLS_GDESC_P (tls_type))
1997 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1998 htab->tlsdesc_plt = (bfd_vma) -1;
2002 h->got.offset = (bfd_vma) -1;
2004 if (eh->dyn_relocs == NULL)
2007 /* In the shared -Bsymbolic case, discard space allocated for
2008 dynamic pc-relative relocs against symbols which turn out to be
2009 defined in regular objects. For the normal shared case, discard
2010 space for pc-relative relocs that have become local due to symbol
2011 visibility changes. */
2015 /* Relocs that use pc_count are those that appear on a call
2016 insn, or certain REL relocs that can generated via assembly.
2017 We want calls to protected symbols to resolve directly to the
2018 function rather than going via the plt. If people want
2019 function pointer comparisons to work as expected then they
2020 should avoid writing weird assembly. */
2021 if (SYMBOL_CALLS_LOCAL (info, h))
2023 struct elf_dyn_relocs **pp;
2025 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2027 p->count -= p->pc_count;
2036 /* Also discard relocs on undefined weak syms with non-default
2038 if (eh->dyn_relocs != NULL
2039 && h->root.type == bfd_link_hash_undefweak)
2041 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2042 eh->dyn_relocs = NULL;
2044 /* Make sure undefined weak symbols are output as a dynamic
2046 else if (h->dynindx == -1
2047 && ! h->forced_local
2048 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2053 else if (ELIMINATE_COPY_RELOCS)
2055 /* For the non-shared case, discard space for relocs against
2056 symbols which turn out to need copy relocs or are not
2062 || (htab->elf.dynamic_sections_created
2063 && (h->root.type == bfd_link_hash_undefweak
2064 || h->root.type == bfd_link_hash_undefined))))
2066 /* Make sure this symbol is output as a dynamic symbol.
2067 Undefined weak syms won't yet be marked as dynamic. */
2068 if (h->dynindx == -1
2069 && ! h->forced_local
2070 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2073 /* If that succeeded, we know we'll be keeping all the
2075 if (h->dynindx != -1)
2079 eh->dyn_relocs = NULL;
2084 /* Finally, allocate space. */
2085 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2089 sreloc = elf_section_data (p->sec)->sreloc;
2091 BFD_ASSERT (sreloc != NULL);
2093 sreloc->size += p->count * sizeof (Elf64_External_Rela);
2099 /* Allocate space in .plt, .got and associated reloc sections for
2100 local dynamic relocs. */
2103 elf64_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2105 struct elf_link_hash_entry *h
2106 = (struct elf_link_hash_entry *) *slot;
2108 if (h->type != STT_GNU_IFUNC
2112 || h->root.type != bfd_link_hash_defined)
2115 return elf64_x86_64_allocate_dynrelocs (h, inf);
2118 /* Find any dynamic relocs that apply to read-only sections. */
2121 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2123 struct elf64_x86_64_link_hash_entry *eh;
2124 struct elf_dyn_relocs *p;
2126 if (h->root.type == bfd_link_hash_warning)
2127 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2129 eh = (struct elf64_x86_64_link_hash_entry *) h;
2130 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2132 asection *s = p->sec->output_section;
2134 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2136 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2138 info->flags |= DF_TEXTREL;
2140 /* Not an error, just cut short the traversal. */
2147 /* Set the sizes of the dynamic sections. */
2150 elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2151 struct bfd_link_info *info)
2153 struct elf64_x86_64_link_hash_table *htab;
2159 htab = elf64_x86_64_hash_table (info);
2160 dynobj = htab->elf.dynobj;
2164 if (htab->elf.dynamic_sections_created)
2166 /* Set the contents of the .interp section to the interpreter. */
2167 if (info->executable)
2169 s = bfd_get_section_by_name (dynobj, ".interp");
2172 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2173 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2177 /* Set up .got offsets for local syms, and space for local dynamic
2179 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2181 bfd_signed_vma *local_got;
2182 bfd_signed_vma *end_local_got;
2183 char *local_tls_type;
2184 bfd_vma *local_tlsdesc_gotent;
2185 bfd_size_type locsymcount;
2186 Elf_Internal_Shdr *symtab_hdr;
2189 if (! is_x86_64_elf (ibfd))
2192 for (s = ibfd->sections; s != NULL; s = s->next)
2194 struct elf_dyn_relocs *p;
2196 for (p = (struct elf_dyn_relocs *)
2197 (elf_section_data (s)->local_dynrel);
2201 if (!bfd_is_abs_section (p->sec)
2202 && bfd_is_abs_section (p->sec->output_section))
2204 /* Input section has been discarded, either because
2205 it is a copy of a linkonce section or due to
2206 linker script /DISCARD/, so we'll be discarding
2209 else if (p->count != 0)
2211 srel = elf_section_data (p->sec)->sreloc;
2212 srel->size += p->count * sizeof (Elf64_External_Rela);
2213 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2214 info->flags |= DF_TEXTREL;
2219 local_got = elf_local_got_refcounts (ibfd);
2223 symtab_hdr = &elf_symtab_hdr (ibfd);
2224 locsymcount = symtab_hdr->sh_info;
2225 end_local_got = local_got + locsymcount;
2226 local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
2227 local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd);
2229 srel = htab->elf.srelgot;
2230 for (; local_got < end_local_got;
2231 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2233 *local_tlsdesc_gotent = (bfd_vma) -1;
2236 if (GOT_TLS_GDESC_P (*local_tls_type))
2238 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2239 - elf64_x86_64_compute_jump_table_size (htab);
2240 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2241 *local_got = (bfd_vma) -2;
2243 if (! GOT_TLS_GDESC_P (*local_tls_type)
2244 || GOT_TLS_GD_P (*local_tls_type))
2246 *local_got = s->size;
2247 s->size += GOT_ENTRY_SIZE;
2248 if (GOT_TLS_GD_P (*local_tls_type))
2249 s->size += GOT_ENTRY_SIZE;
2252 || GOT_TLS_GD_ANY_P (*local_tls_type)
2253 || *local_tls_type == GOT_TLS_IE)
2255 if (GOT_TLS_GDESC_P (*local_tls_type))
2257 htab->elf.srelplt->size
2258 += sizeof (Elf64_External_Rela);
2259 htab->tlsdesc_plt = (bfd_vma) -1;
2261 if (! GOT_TLS_GDESC_P (*local_tls_type)
2262 || GOT_TLS_GD_P (*local_tls_type))
2263 srel->size += sizeof (Elf64_External_Rela);
2267 *local_got = (bfd_vma) -1;
2271 if (htab->tls_ld_got.refcount > 0)
2273 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2275 htab->tls_ld_got.offset = htab->elf.sgot->size;
2276 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2277 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2280 htab->tls_ld_got.offset = -1;
2282 /* Allocate global sym .plt and .got entries, and space for global
2283 sym dynamic relocs. */
2284 elf_link_hash_traverse (&htab->elf, elf64_x86_64_allocate_dynrelocs,
2287 /* Allocate .plt and .got entries, and space for local symbols. */
2288 htab_traverse (htab->loc_hash_table,
2289 elf64_x86_64_allocate_local_dynrelocs,
2292 /* For every jump slot reserved in the sgotplt, reloc_count is
2293 incremented. However, when we reserve space for TLS descriptors,
2294 it's not incremented, so in order to compute the space reserved
2295 for them, it suffices to multiply the reloc count by the jump
2297 if (htab->elf.srelplt)
2298 htab->sgotplt_jump_table_size
2299 = elf64_x86_64_compute_jump_table_size (htab);
2301 if (htab->tlsdesc_plt)
2303 /* If we're not using lazy TLS relocations, don't generate the
2304 PLT and GOT entries they require. */
2305 if ((info->flags & DF_BIND_NOW))
2306 htab->tlsdesc_plt = 0;
2309 htab->tlsdesc_got = htab->elf.sgot->size;
2310 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2311 /* Reserve room for the initial entry.
2312 FIXME: we could probably do away with it in this case. */
2313 if (htab->elf.splt->size == 0)
2314 htab->elf.splt->size += PLT_ENTRY_SIZE;
2315 htab->tlsdesc_plt = htab->elf.splt->size;
2316 htab->elf.splt->size += PLT_ENTRY_SIZE;
2320 /* We now have determined the sizes of the various dynamic sections.
2321 Allocate memory for them. */
2323 for (s = dynobj->sections; s != NULL; s = s->next)
2325 if ((s->flags & SEC_LINKER_CREATED) == 0)
2328 if (s == htab->elf.splt
2329 || s == htab->elf.sgot
2330 || s == htab->elf.sgotplt
2331 || s == htab->elf.iplt
2332 || s == htab->elf.igotplt
2333 || s == htab->sdynbss)
2335 /* Strip this section if we don't need it; see the
2338 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2340 if (s->size != 0 && s != htab->elf.srelplt)
2343 /* We use the reloc_count field as a counter if we need
2344 to copy relocs into the output file. */
2345 if (s != htab->elf.srelplt)
2350 /* It's not one of our sections, so don't allocate space. */
2356 /* If we don't need this section, strip it from the
2357 output file. This is mostly to handle .rela.bss and
2358 .rela.plt. We must create both sections in
2359 create_dynamic_sections, because they must be created
2360 before the linker maps input sections to output
2361 sections. The linker does that before
2362 adjust_dynamic_symbol is called, and it is that
2363 function which decides whether anything needs to go
2364 into these sections. */
2366 s->flags |= SEC_EXCLUDE;
2370 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2373 /* Allocate memory for the section contents. We use bfd_zalloc
2374 here in case unused entries are not reclaimed before the
2375 section's contents are written out. This should not happen,
2376 but this way if it does, we get a R_X86_64_NONE reloc instead
2378 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2379 if (s->contents == NULL)
2383 if (htab->elf.dynamic_sections_created)
2385 /* Add some entries to the .dynamic section. We fill in the
2386 values later, in elf64_x86_64_finish_dynamic_sections, but we
2387 must add the entries now so that we get the correct size for
2388 the .dynamic section. The DT_DEBUG entry is filled in by the
2389 dynamic linker and used by the debugger. */
2390 #define add_dynamic_entry(TAG, VAL) \
2391 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2393 if (info->executable)
2395 if (!add_dynamic_entry (DT_DEBUG, 0))
2399 if (htab->elf.splt->size != 0)
2401 if (!add_dynamic_entry (DT_PLTGOT, 0)
2402 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2403 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2404 || !add_dynamic_entry (DT_JMPREL, 0))
2407 if (htab->tlsdesc_plt
2408 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2409 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2415 if (!add_dynamic_entry (DT_RELA, 0)
2416 || !add_dynamic_entry (DT_RELASZ, 0)
2417 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2420 /* If any dynamic relocs apply to a read-only section,
2421 then we need a DT_TEXTREL entry. */
2422 if ((info->flags & DF_TEXTREL) == 0)
2423 elf_link_hash_traverse (&htab->elf,
2424 elf64_x86_64_readonly_dynrelocs,
2427 if ((info->flags & DF_TEXTREL) != 0)
2429 if (!add_dynamic_entry (DT_TEXTREL, 0))
2434 #undef add_dynamic_entry
2440 elf64_x86_64_always_size_sections (bfd *output_bfd,
2441 struct bfd_link_info *info)
2443 asection *tls_sec = elf_hash_table (info)->tls_sec;
2447 struct elf_link_hash_entry *tlsbase;
2449 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2450 "_TLS_MODULE_BASE_",
2451 FALSE, FALSE, FALSE);
2453 if (tlsbase && tlsbase->type == STT_TLS)
2455 struct bfd_link_hash_entry *bh = NULL;
2456 const struct elf_backend_data *bed
2457 = get_elf_backend_data (output_bfd);
2459 if (!(_bfd_generic_link_add_one_symbol
2460 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2461 tls_sec, 0, NULL, FALSE,
2462 bed->collect, &bh)))
2465 elf64_x86_64_hash_table (info)->tls_module_base = bh;
2467 tlsbase = (struct elf_link_hash_entry *)bh;
2468 tlsbase->def_regular = 1;
2469 tlsbase->other = STV_HIDDEN;
2470 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2477 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2478 executables. Rather than setting it to the beginning of the TLS
2479 section, we have to set it to the end. This function may be called
2480 multiple times, it is idempotent. */
2483 elf64_x86_64_set_tls_module_base (struct bfd_link_info *info)
2485 struct bfd_link_hash_entry *base;
2487 if (!info->executable)
2490 base = elf64_x86_64_hash_table (info)->tls_module_base;
2495 base->u.def.value = elf_hash_table (info)->tls_size;
2498 /* Return the base VMA address which should be subtracted from real addresses
2499 when resolving @dtpoff relocation.
2500 This is PT_TLS segment p_vaddr. */
2503 elf64_x86_64_dtpoff_base (struct bfd_link_info *info)
2505 /* If tls_sec is NULL, we should have signalled an error already. */
2506 if (elf_hash_table (info)->tls_sec == NULL)
2508 return elf_hash_table (info)->tls_sec->vma;
2511 /* Return the relocation value for @tpoff relocation
2512 if STT_TLS virtual address is ADDRESS. */
2515 elf64_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2517 struct elf_link_hash_table *htab = elf_hash_table (info);
2519 /* If tls_segment is NULL, we should have signalled an error already. */
2520 if (htab->tls_sec == NULL)
2522 return address - htab->tls_size - htab->tls_sec->vma;
2525 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2529 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2531 /* Opcode Instruction
2534 0x0f 0x8x conditional jump */
2536 && (contents [offset - 1] == 0xe8
2537 || contents [offset - 1] == 0xe9))
2539 && contents [offset - 2] == 0x0f
2540 && (contents [offset - 1] & 0xf0) == 0x80));
2543 /* Relocate an x86_64 ELF section. */
2546 elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
2547 bfd *input_bfd, asection *input_section,
2548 bfd_byte *contents, Elf_Internal_Rela *relocs,
2549 Elf_Internal_Sym *local_syms,
2550 asection **local_sections)
2552 struct elf64_x86_64_link_hash_table *htab;
2553 Elf_Internal_Shdr *symtab_hdr;
2554 struct elf_link_hash_entry **sym_hashes;
2555 bfd_vma *local_got_offsets;
2556 bfd_vma *local_tlsdesc_gotents;
2557 Elf_Internal_Rela *rel;
2558 Elf_Internal_Rela *relend;
2560 BFD_ASSERT (is_x86_64_elf (input_bfd));
2562 htab = elf64_x86_64_hash_table (info);
2563 symtab_hdr = &elf_symtab_hdr (input_bfd);
2564 sym_hashes = elf_sym_hashes (input_bfd);
2565 local_got_offsets = elf_local_got_offsets (input_bfd);
2566 local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
2568 elf64_x86_64_set_tls_module_base (info);
2571 relend = relocs + input_section->reloc_count;
2572 for (; rel < relend; rel++)
2574 unsigned int r_type;
2575 reloc_howto_type *howto;
2576 unsigned long r_symndx;
2577 struct elf_link_hash_entry *h;
2578 Elf_Internal_Sym *sym;
2580 bfd_vma off, offplt;
2582 bfd_boolean unresolved_reloc;
2583 bfd_reloc_status_type r;
2587 r_type = ELF64_R_TYPE (rel->r_info);
2588 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2589 || r_type == (int) R_X86_64_GNU_VTENTRY)
2592 if (r_type >= R_X86_64_max)
2594 bfd_set_error (bfd_error_bad_value);
2598 howto = x86_64_elf_howto_table + r_type;
2599 r_symndx = ELF64_R_SYM (rel->r_info);
2603 unresolved_reloc = FALSE;
2604 if (r_symndx < symtab_hdr->sh_info)
2606 sym = local_syms + r_symndx;
2607 sec = local_sections[r_symndx];
2609 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2612 /* Relocate against local STT_GNU_IFUNC symbol. */
2613 if (ELF64_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2615 h = elf64_x86_64_get_local_sym_hash (htab, input_bfd,
2620 /* Set STT_GNU_IFUNC symbol value. */
2621 h->root.u.def.value = sym->st_value;
2622 h->root.u.def.section = sec;
2629 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2630 r_symndx, symtab_hdr, sym_hashes,
2632 unresolved_reloc, warned);
2635 if (sec != NULL && elf_discarded_section (sec))
2637 /* For relocs against symbols from removed linkonce sections,
2638 or sections discarded by a linker script, we just want the
2639 section contents zeroed. Avoid any special processing. */
2640 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2646 if (info->relocatable)
2649 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2650 it here if it is defined in a non-shared object. */
2652 && h->type == STT_GNU_IFUNC
2658 if ((input_section->flags & SEC_ALLOC) == 0
2659 || h->plt.offset == (bfd_vma) -1)
2662 /* STT_GNU_IFUNC symbol must go through PLT. */
2663 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
2664 relocation = (plt->output_section->vma
2665 + plt->output_offset + h->plt.offset);
2670 (*_bfd_error_handler)
2671 (_("%B: relocation %s against STT_GNU_IFUNC "
2672 "symbol `%s' isn't handled by %s"), input_bfd,
2673 x86_64_elf_howto_table[r_type].name,
2674 (h->root.root.string
2675 ? h->root.root.string : "a local symbol"),
2677 bfd_set_error (bfd_error_bad_value);
2686 if (rel->r_addend != 0)
2688 (*_bfd_error_handler)
2689 (_("%B: relocation %s against STT_GNU_IFUNC "
2690 "symbol `%s' has non-zero addend: %d"),
2691 input_bfd, x86_64_elf_howto_table[r_type].name,
2692 (h->root.root.string
2693 ? h->root.root.string : "a local symbol"),
2695 bfd_set_error (bfd_error_bad_value);
2699 /* Generate dynamic relcoation only when there is a
2700 non-GOF reference in a shared object. */
2701 if (info->shared && h->non_got_ref)
2703 Elf_Internal_Rela outrel;
2707 /* Need a dynamic relocation to get the real function
2709 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2713 if (outrel.r_offset == (bfd_vma) -1
2714 || outrel.r_offset == (bfd_vma) -2)
2717 outrel.r_offset += (input_section->output_section->vma
2718 + input_section->output_offset);
2720 if (h->dynindx == -1
2722 || info->executable)
2724 /* This symbol is resolved locally. */
2725 outrel.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
2726 outrel.r_addend = (h->root.u.def.value
2727 + h->root.u.def.section->output_section->vma
2728 + h->root.u.def.section->output_offset);
2732 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2733 outrel.r_addend = 0;
2736 sreloc = htab->elf.irelifunc;
2737 loc = sreloc->contents;
2738 loc += (sreloc->reloc_count++
2739 * sizeof (Elf64_External_Rela));
2740 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2742 /* If this reloc is against an external symbol, we
2743 do not want to fiddle with the addend. Otherwise,
2744 we need to include the symbol value so that it
2745 becomes an addend for the dynamic reloc. For an
2746 internal symbol, we have updated addend. */
2753 case R_X86_64_PLT32:
2756 case R_X86_64_GOTPCREL:
2757 case R_X86_64_GOTPCREL64:
2758 base_got = htab->elf.sgot;
2759 off = h->got.offset;
2761 if (base_got == NULL)
2764 if (off == (bfd_vma) -1)
2766 /* We can't use h->got.offset here to save state, or
2767 even just remember the offset, as finish_dynamic_symbol
2768 would use that as offset into .got. */
2770 if (htab->elf.splt != NULL)
2772 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2773 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2774 base_got = htab->elf.sgotplt;
2778 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2779 off = plt_index * GOT_ENTRY_SIZE;
2780 base_got = htab->elf.igotplt;
2783 if (h->dynindx == -1
2787 /* This references the local defitionion. We must
2788 initialize this entry in the global offset table.
2789 Since the offset must always be a multiple of 8,
2790 we use the least significant bit to record
2791 whether we have initialized it already.
2793 When doing a dynamic link, we create a .rela.got
2794 relocation entry to initialize the value. This
2795 is done in the finish_dynamic_symbol routine. */
2800 bfd_put_64 (output_bfd, relocation,
2801 base_got->contents + off);
2802 /* Note that this is harmless for the GOTPLT64
2803 case, as -1 | 1 still is -1. */
2809 relocation = (base_got->output_section->vma
2810 + base_got->output_offset + off);
2812 if (r_type != R_X86_64_GOTPCREL
2813 && r_type != R_X86_64_GOTPCREL64)
2816 if (htab->elf.splt != NULL)
2817 gotplt = htab->elf.sgotplt;
2819 gotplt = htab->elf.igotplt;
2820 relocation -= (gotplt->output_section->vma
2821 - gotplt->output_offset);
2828 /* When generating a shared object, the relocations handled here are
2829 copied into the output file to be resolved at run time. */
2832 case R_X86_64_GOT32:
2833 case R_X86_64_GOT64:
2834 /* Relocation is to the entry for this symbol in the global
2836 case R_X86_64_GOTPCREL:
2837 case R_X86_64_GOTPCREL64:
2838 /* Use global offset table entry as symbol value. */
2839 case R_X86_64_GOTPLT64:
2840 /* This is the same as GOT64 for relocation purposes, but
2841 indicates the existence of a PLT entry. The difficulty is,
2842 that we must calculate the GOT slot offset from the PLT
2843 offset, if this symbol got a PLT entry (it was global).
2844 Additionally if it's computed from the PLT entry, then that
2845 GOT offset is relative to .got.plt, not to .got. */
2846 base_got = htab->elf.sgot;
2848 if (htab->elf.sgot == NULL)
2855 off = h->got.offset;
2857 && h->plt.offset != (bfd_vma)-1
2858 && off == (bfd_vma)-1)
2860 /* We can't use h->got.offset here to save
2861 state, or even just remember the offset, as
2862 finish_dynamic_symbol would use that as offset into
2864 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2865 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2866 base_got = htab->elf.sgotplt;
2869 dyn = htab->elf.dynamic_sections_created;
2871 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2873 && SYMBOL_REFERENCES_LOCAL (info, h))
2874 || (ELF_ST_VISIBILITY (h->other)
2875 && h->root.type == bfd_link_hash_undefweak))
2877 /* This is actually a static link, or it is a -Bsymbolic
2878 link and the symbol is defined locally, or the symbol
2879 was forced to be local because of a version file. We
2880 must initialize this entry in the global offset table.
2881 Since the offset must always be a multiple of 8, we
2882 use the least significant bit to record whether we
2883 have initialized it already.
2885 When doing a dynamic link, we create a .rela.got
2886 relocation entry to initialize the value. This is
2887 done in the finish_dynamic_symbol routine. */
2892 bfd_put_64 (output_bfd, relocation,
2893 base_got->contents + off);
2894 /* Note that this is harmless for the GOTPLT64 case,
2895 as -1 | 1 still is -1. */
2900 unresolved_reloc = FALSE;
2904 if (local_got_offsets == NULL)
2907 off = local_got_offsets[r_symndx];
2909 /* The offset must always be a multiple of 8. We use
2910 the least significant bit to record whether we have
2911 already generated the necessary reloc. */
2916 bfd_put_64 (output_bfd, relocation,
2917 base_got->contents + off);
2922 Elf_Internal_Rela outrel;
2925 /* We need to generate a R_X86_64_RELATIVE reloc
2926 for the dynamic linker. */
2927 s = htab->elf.srelgot;
2931 outrel.r_offset = (base_got->output_section->vma
2932 + base_got->output_offset
2934 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2935 outrel.r_addend = relocation;
2937 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2938 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2941 local_got_offsets[r_symndx] |= 1;
2945 if (off >= (bfd_vma) -2)
2948 relocation = base_got->output_section->vma
2949 + base_got->output_offset + off;
2950 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
2951 relocation -= htab->elf.sgotplt->output_section->vma
2952 - htab->elf.sgotplt->output_offset;
2956 case R_X86_64_GOTOFF64:
2957 /* Relocation is relative to the start of the global offset
2960 /* Check to make sure it isn't a protected function symbol
2961 for shared library since it may not be local when used
2962 as function address. */
2966 && h->type == STT_FUNC
2967 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2969 (*_bfd_error_handler)
2970 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
2971 input_bfd, h->root.root.string);
2972 bfd_set_error (bfd_error_bad_value);
2976 /* Note that sgot is not involved in this
2977 calculation. We always want the start of .got.plt. If we
2978 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2979 permitted by the ABI, we might have to change this
2981 relocation -= htab->elf.sgotplt->output_section->vma
2982 + htab->elf.sgotplt->output_offset;
2985 case R_X86_64_GOTPC32:
2986 case R_X86_64_GOTPC64:
2987 /* Use global offset table as symbol value. */
2988 relocation = htab->elf.sgotplt->output_section->vma
2989 + htab->elf.sgotplt->output_offset;
2990 unresolved_reloc = FALSE;
2993 case R_X86_64_PLTOFF64:
2994 /* Relocation is PLT entry relative to GOT. For local
2995 symbols it's the symbol itself relative to GOT. */
2997 /* See PLT32 handling. */
2998 && h->plt.offset != (bfd_vma) -1
2999 && htab->elf.splt != NULL)
3001 relocation = (htab->elf.splt->output_section->vma
3002 + htab->elf.splt->output_offset
3004 unresolved_reloc = FALSE;
3007 relocation -= htab->elf.sgotplt->output_section->vma
3008 + htab->elf.sgotplt->output_offset;
3011 case R_X86_64_PLT32:
3012 /* Relocation is to the entry for this symbol in the
3013 procedure linkage table. */
3015 /* Resolve a PLT32 reloc against a local symbol directly,
3016 without using the procedure linkage table. */
3020 if (h->plt.offset == (bfd_vma) -1
3021 || htab->elf.splt == NULL)
3023 /* We didn't make a PLT entry for this symbol. This
3024 happens when statically linking PIC code, or when
3025 using -Bsymbolic. */
3029 relocation = (htab->elf.splt->output_section->vma
3030 + htab->elf.splt->output_offset
3032 unresolved_reloc = FALSE;
3039 && (input_section->flags & SEC_ALLOC) != 0
3040 && (input_section->flags & SEC_READONLY) != 0
3043 bfd_boolean fail = FALSE;
3045 = (r_type == R_X86_64_PC32
3046 && is_32bit_relative_branch (contents, rel->r_offset));
3048 if (SYMBOL_REFERENCES_LOCAL (info, h))
3050 /* Symbol is referenced locally. Make sure it is
3051 defined locally or for a branch. */
3052 fail = !h->def_regular && !branch;
3056 /* Symbol isn't referenced locally. We only allow
3057 branch to symbol with non-default visibility. */
3059 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3066 const char *pic = "";
3068 switch (ELF_ST_VISIBILITY (h->other))
3071 v = _("hidden symbol");
3074 v = _("internal symbol");
3077 v = _("protected symbol");
3081 pic = _("; recompile with -fPIC");
3086 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3088 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3090 (*_bfd_error_handler) (fmt, input_bfd,
3091 x86_64_elf_howto_table[r_type].name,
3092 v, h->root.root.string, pic);
3093 bfd_set_error (bfd_error_bad_value);
3104 /* FIXME: The ABI says the linker should make sure the value is
3105 the same when it's zeroextended to 64 bit. */
3107 if ((input_section->flags & SEC_ALLOC) == 0)
3112 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3113 || h->root.type != bfd_link_hash_undefweak)
3114 && (! IS_X86_64_PCREL_TYPE (r_type)
3115 || ! SYMBOL_CALLS_LOCAL (info, h)))
3116 || (ELIMINATE_COPY_RELOCS
3123 || h->root.type == bfd_link_hash_undefweak
3124 || h->root.type == bfd_link_hash_undefined)))
3126 Elf_Internal_Rela outrel;
3128 bfd_boolean skip, relocate;
3131 /* When generating a shared object, these relocations
3132 are copied into the output file to be resolved at run
3138 _bfd_elf_section_offset (output_bfd, info, input_section,
3140 if (outrel.r_offset == (bfd_vma) -1)
3142 else if (outrel.r_offset == (bfd_vma) -2)
3143 skip = TRUE, relocate = TRUE;
3145 outrel.r_offset += (input_section->output_section->vma
3146 + input_section->output_offset);
3149 memset (&outrel, 0, sizeof outrel);
3151 /* h->dynindx may be -1 if this symbol was marked to
3155 && (IS_X86_64_PCREL_TYPE (r_type)
3157 || ! SYMBOLIC_BIND (info, h)
3158 || ! h->def_regular))
3160 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
3161 outrel.r_addend = rel->r_addend;
3165 /* This symbol is local, or marked to become local. */
3166 if (r_type == R_X86_64_64)
3169 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3170 outrel.r_addend = relocation + rel->r_addend;
3176 if (bfd_is_abs_section (sec))
3178 else if (sec == NULL || sec->owner == NULL)
3180 bfd_set_error (bfd_error_bad_value);
3187 /* We are turning this relocation into one
3188 against a section symbol. It would be
3189 proper to subtract the symbol's value,
3190 osec->vma, from the emitted reloc addend,
3191 but ld.so expects buggy relocs. */
3192 osec = sec->output_section;
3193 sindx = elf_section_data (osec)->dynindx;
3196 asection *oi = htab->elf.text_index_section;
3197 sindx = elf_section_data (oi)->dynindx;
3199 BFD_ASSERT (sindx != 0);
3202 outrel.r_info = ELF64_R_INFO (sindx, r_type);
3203 outrel.r_addend = relocation + rel->r_addend;
3207 sreloc = elf_section_data (input_section)->sreloc;
3209 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3211 loc = sreloc->contents;
3212 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3213 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3215 /* If this reloc is against an external symbol, we do
3216 not want to fiddle with the addend. Otherwise, we
3217 need to include the symbol value so that it becomes
3218 an addend for the dynamic reloc. */
3225 case R_X86_64_TLSGD:
3226 case R_X86_64_GOTPC32_TLSDESC:
3227 case R_X86_64_TLSDESC_CALL:
3228 case R_X86_64_GOTTPOFF:
3229 tls_type = GOT_UNKNOWN;
3230 if (h == NULL && local_got_offsets)
3231 tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3233 tls_type = elf64_x86_64_hash_entry (h)->tls_type;
3235 if (! elf64_x86_64_tls_transition (info, input_bfd,
3236 input_section, contents,
3237 symtab_hdr, sym_hashes,
3238 &r_type, tls_type, rel,
3242 if (r_type == R_X86_64_TPOFF32)
3244 bfd_vma roff = rel->r_offset;
3246 BFD_ASSERT (! unresolved_reloc);
3248 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3250 /* GD->LE transition.
3251 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3252 .word 0x6666; rex64; call __tls_get_addr
3255 leaq foo@tpoff(%rax), %rax */
3256 memcpy (contents + roff - 4,
3257 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3259 bfd_put_32 (output_bfd,
3260 elf64_x86_64_tpoff (info, relocation),
3261 contents + roff + 8);
3262 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3266 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3268 /* GDesc -> LE transition.
3269 It's originally something like:
3270 leaq x@tlsdesc(%rip), %rax
3276 unsigned int val, type, type2;
3278 type = bfd_get_8 (input_bfd, contents + roff - 3);
3279 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
3280 val = bfd_get_8 (input_bfd, contents + roff - 1);
3281 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3282 contents + roff - 3);
3283 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3284 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3285 contents + roff - 1);
3286 bfd_put_32 (output_bfd,
3287 elf64_x86_64_tpoff (info, relocation),
3291 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3293 /* GDesc -> LE transition.
3298 bfd_put_8 (output_bfd, 0x66, contents + roff);
3299 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3302 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3304 /* IE->LE transition:
3305 Originally it can be one of:
3306 movq foo@gottpoff(%rip), %reg
3307 addq foo@gottpoff(%rip), %reg
3310 leaq foo(%reg), %reg
3313 unsigned int val, type, reg;
3315 val = bfd_get_8 (input_bfd, contents + roff - 3);
3316 type = bfd_get_8 (input_bfd, contents + roff - 2);
3317 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3323 bfd_put_8 (output_bfd, 0x49,
3324 contents + roff - 3);
3325 bfd_put_8 (output_bfd, 0xc7,
3326 contents + roff - 2);
3327 bfd_put_8 (output_bfd, 0xc0 | reg,
3328 contents + roff - 1);
3332 /* addq -> addq - addressing with %rsp/%r12 is
3335 bfd_put_8 (output_bfd, 0x49,
3336 contents + roff - 3);
3337 bfd_put_8 (output_bfd, 0x81,
3338 contents + roff - 2);
3339 bfd_put_8 (output_bfd, 0xc0 | reg,
3340 contents + roff - 1);
3346 bfd_put_8 (output_bfd, 0x4d,
3347 contents + roff - 3);
3348 bfd_put_8 (output_bfd, 0x8d,
3349 contents + roff - 2);
3350 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3351 contents + roff - 1);
3353 bfd_put_32 (output_bfd,
3354 elf64_x86_64_tpoff (info, relocation),
3362 if (htab->elf.sgot == NULL)
3367 off = h->got.offset;
3368 offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got;
3372 if (local_got_offsets == NULL)
3375 off = local_got_offsets[r_symndx];
3376 offplt = local_tlsdesc_gotents[r_symndx];
3383 Elf_Internal_Rela outrel;
3388 if (htab->elf.srelgot == NULL)
3391 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3393 if (GOT_TLS_GDESC_P (tls_type))
3395 outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC);
3396 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3397 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3398 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3399 + htab->elf.sgotplt->output_offset
3401 + htab->sgotplt_jump_table_size);
3402 sreloc = htab->elf.srelplt;
3403 loc = sreloc->contents;
3404 loc += sreloc->reloc_count++
3405 * sizeof (Elf64_External_Rela);
3406 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3407 <= sreloc->contents + sreloc->size);
3409 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3411 outrel.r_addend = 0;
3412 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3415 sreloc = htab->elf.srelgot;
3417 outrel.r_offset = (htab->elf.sgot->output_section->vma
3418 + htab->elf.sgot->output_offset + off);
3420 if (GOT_TLS_GD_P (tls_type))
3421 dr_type = R_X86_64_DTPMOD64;
3422 else if (GOT_TLS_GDESC_P (tls_type))
3425 dr_type = R_X86_64_TPOFF64;
3427 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3428 outrel.r_addend = 0;
3429 if ((dr_type == R_X86_64_TPOFF64
3430 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3431 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3432 outrel.r_info = ELF64_R_INFO (indx, dr_type);
3434 loc = sreloc->contents;
3435 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3436 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3437 <= sreloc->contents + sreloc->size);
3438 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3440 if (GOT_TLS_GD_P (tls_type))
3444 BFD_ASSERT (! unresolved_reloc);
3445 bfd_put_64 (output_bfd,
3446 relocation - elf64_x86_64_dtpoff_base (info),
3447 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3451 bfd_put_64 (output_bfd, 0,
3452 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3453 outrel.r_info = ELF64_R_INFO (indx,
3455 outrel.r_offset += GOT_ENTRY_SIZE;
3456 sreloc->reloc_count++;
3457 loc += sizeof (Elf64_External_Rela);
3458 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3459 <= sreloc->contents + sreloc->size);
3460 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3468 local_got_offsets[r_symndx] |= 1;
3471 if (off >= (bfd_vma) -2
3472 && ! GOT_TLS_GDESC_P (tls_type))
3474 if (r_type == ELF64_R_TYPE (rel->r_info))
3476 if (r_type == R_X86_64_GOTPC32_TLSDESC
3477 || r_type == R_X86_64_TLSDESC_CALL)
3478 relocation = htab->elf.sgotplt->output_section->vma
3479 + htab->elf.sgotplt->output_offset
3480 + offplt + htab->sgotplt_jump_table_size;
3482 relocation = htab->elf.sgot->output_section->vma
3483 + htab->elf.sgot->output_offset + off;
3484 unresolved_reloc = FALSE;
3488 bfd_vma roff = rel->r_offset;
3490 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3492 /* GD->IE transition.
3493 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3494 .word 0x6666; rex64; call __tls_get_addr@plt
3497 addq foo@gottpoff(%rip), %rax */
3498 memcpy (contents + roff - 4,
3499 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3502 relocation = (htab->elf.sgot->output_section->vma
3503 + htab->elf.sgot->output_offset + off
3505 - input_section->output_section->vma
3506 - input_section->output_offset
3508 bfd_put_32 (output_bfd, relocation,
3509 contents + roff + 8);
3510 /* Skip R_X86_64_PLT32. */
3514 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3516 /* GDesc -> IE transition.
3517 It's originally something like:
3518 leaq x@tlsdesc(%rip), %rax
3521 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3524 unsigned int val, type, type2;
3526 type = bfd_get_8 (input_bfd, contents + roff - 3);
3527 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
3528 val = bfd_get_8 (input_bfd, contents + roff - 1);
3530 /* Now modify the instruction as appropriate. To
3531 turn a leaq into a movq in the form we use it, it
3532 suffices to change the second byte from 0x8d to
3534 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3536 bfd_put_32 (output_bfd,
3537 htab->elf.sgot->output_section->vma
3538 + htab->elf.sgot->output_offset + off
3540 - input_section->output_section->vma
3541 - input_section->output_offset
3546 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3548 /* GDesc -> IE transition.
3555 unsigned int val, type;
3557 type = bfd_get_8 (input_bfd, contents + roff);
3558 val = bfd_get_8 (input_bfd, contents + roff + 1);
3559 bfd_put_8 (output_bfd, 0x66, contents + roff);
3560 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3568 case R_X86_64_TLSLD:
3569 if (! elf64_x86_64_tls_transition (info, input_bfd,
3570 input_section, contents,
3571 symtab_hdr, sym_hashes,
3572 &r_type, GOT_UNKNOWN,
3576 if (r_type != R_X86_64_TLSLD)
3578 /* LD->LE transition:
3579 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3581 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3583 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3584 memcpy (contents + rel->r_offset - 3,
3585 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3586 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3591 if (htab->elf.sgot == NULL)
3594 off = htab->tls_ld_got.offset;
3599 Elf_Internal_Rela outrel;
3602 if (htab->elf.srelgot == NULL)
3605 outrel.r_offset = (htab->elf.sgot->output_section->vma
3606 + htab->elf.sgot->output_offset + off);
3608 bfd_put_64 (output_bfd, 0,
3609 htab->elf.sgot->contents + off);
3610 bfd_put_64 (output_bfd, 0,
3611 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3612 outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
3613 outrel.r_addend = 0;
3614 loc = htab->elf.srelgot->contents;
3615 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3616 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3617 htab->tls_ld_got.offset |= 1;
3619 relocation = htab->elf.sgot->output_section->vma
3620 + htab->elf.sgot->output_offset + off;
3621 unresolved_reloc = FALSE;
3624 case R_X86_64_DTPOFF32:
3625 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3626 relocation -= elf64_x86_64_dtpoff_base (info);
3628 relocation = elf64_x86_64_tpoff (info, relocation);
3631 case R_X86_64_TPOFF32:
3632 BFD_ASSERT (! info->shared);
3633 relocation = elf64_x86_64_tpoff (info, relocation);
3640 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3641 because such sections are not SEC_ALLOC and thus ld.so will
3642 not process them. */
3643 if (unresolved_reloc
3644 && !((input_section->flags & SEC_DEBUGGING) != 0
3646 (*_bfd_error_handler)
3647 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3650 (long) rel->r_offset,
3652 h->root.root.string);
3655 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3656 contents, rel->r_offset,
3657 relocation, rel->r_addend);
3659 if (r != bfd_reloc_ok)
3664 name = h->root.root.string;
3667 name = bfd_elf_string_from_elf_section (input_bfd,
3668 symtab_hdr->sh_link,
3673 name = bfd_section_name (input_bfd, sec);
3676 if (r == bfd_reloc_overflow)
3678 if (! ((*info->callbacks->reloc_overflow)
3679 (info, (h ? &h->root : NULL), name, howto->name,
3680 (bfd_vma) 0, input_bfd, input_section,
3686 (*_bfd_error_handler)
3687 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3688 input_bfd, input_section,
3689 (long) rel->r_offset, name, (int) r);
3698 /* Finish up dynamic symbol handling. We set the contents of various
3699 dynamic sections here. */
3702 elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3703 struct bfd_link_info *info,
3704 struct elf_link_hash_entry *h,
3705 Elf_Internal_Sym *sym)
3707 struct elf64_x86_64_link_hash_table *htab;
3709 htab = elf64_x86_64_hash_table (info);
3711 if (h->plt.offset != (bfd_vma) -1)
3715 Elf_Internal_Rela rela;
3717 asection *plt, *gotplt, *relplt;
3719 /* When building a static executable, use .iplt, .igot.plt and
3720 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3721 if (htab->elf.splt != NULL)
3723 plt = htab->elf.splt;
3724 gotplt = htab->elf.sgotplt;
3725 relplt = htab->elf.srelplt;
3729 plt = htab->elf.iplt;
3730 gotplt = htab->elf.igotplt;
3731 relplt = htab->elf.irelplt;
3734 /* This symbol has an entry in the procedure linkage table. Set
3736 if ((h->dynindx == -1
3737 && !((h->forced_local || info->executable)
3739 && h->type == STT_GNU_IFUNC))
3745 /* Get the index in the procedure linkage table which
3746 corresponds to this symbol. This is the index of this symbol
3747 in all the symbols for which we are making plt entries. The
3748 first entry in the procedure linkage table is reserved.
3750 Get the offset into the .got table of the entry that
3751 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3752 bytes. The first three are reserved for the dynamic linker.
3754 For static executables, we don't reserve anything. */
3756 if (plt == htab->elf.splt)
3758 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3759 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3763 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3764 got_offset = plt_index * GOT_ENTRY_SIZE;
3767 /* Fill in the entry in the procedure linkage table. */
3768 memcpy (plt->contents + h->plt.offset, elf64_x86_64_plt_entry,
3771 /* Insert the relocation positions of the plt section. The magic
3772 numbers at the end of the statements are the positions of the
3773 relocations in the plt section. */
3774 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3775 instruction uses 6 bytes, subtract this value. */
3776 bfd_put_32 (output_bfd,
3777 (gotplt->output_section->vma
3778 + gotplt->output_offset
3780 - plt->output_section->vma
3781 - plt->output_offset
3784 plt->contents + h->plt.offset + 2);
3786 /* Don't fill PLT entry for static executables. */
3787 if (plt == htab->elf.splt)
3789 /* Put relocation index. */
3790 bfd_put_32 (output_bfd, plt_index,
3791 plt->contents + h->plt.offset + 7);
3792 /* Put offset for jmp .PLT0. */
3793 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3794 plt->contents + h->plt.offset + 12);
3797 /* Fill in the entry in the global offset table, initially this
3798 points to the pushq instruction in the PLT which is at offset 6. */
3799 bfd_put_64 (output_bfd, (plt->output_section->vma
3800 + plt->output_offset
3801 + h->plt.offset + 6),
3802 gotplt->contents + got_offset);
3804 /* Fill in the entry in the .rela.plt section. */
3805 rela.r_offset = (gotplt->output_section->vma
3806 + gotplt->output_offset
3808 if (h->dynindx == -1
3809 || ((info->executable
3810 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3812 && h->type == STT_GNU_IFUNC))
3814 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3815 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3816 rela.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
3817 rela.r_addend = (h->root.u.def.value
3818 + h->root.u.def.section->output_section->vma
3819 + h->root.u.def.section->output_offset);
3823 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
3826 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3827 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3829 if (!h->def_regular)
3831 /* Mark the symbol as undefined, rather than as defined in
3832 the .plt section. Leave the value if there were any
3833 relocations where pointer equality matters (this is a clue
3834 for the dynamic linker, to make function pointer
3835 comparisons work between an application and shared
3836 library), otherwise set it to zero. If a function is only
3837 called from a binary, there is no need to slow down
3838 shared libraries because of that. */
3839 sym->st_shndx = SHN_UNDEF;
3840 if (!h->pointer_equality_needed)
3845 if (h->got.offset != (bfd_vma) -1
3846 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type)
3847 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
3849 Elf_Internal_Rela rela;
3852 /* This symbol has an entry in the global offset table. Set it
3854 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3857 rela.r_offset = (htab->elf.sgot->output_section->vma
3858 + htab->elf.sgot->output_offset
3859 + (h->got.offset &~ (bfd_vma) 1));
3861 /* If this is a static link, or it is a -Bsymbolic link and the
3862 symbol is defined locally or was forced to be local because
3863 of a version file, we just want to emit a RELATIVE reloc.
3864 The entry in the global offset table will already have been
3865 initialized in the relocate_section function. */
3867 && h->type == STT_GNU_IFUNC)
3871 /* Generate R_X86_64_GLOB_DAT. */
3876 if (!h->pointer_equality_needed)
3879 /* For non-shared object, we can't use .got.plt, which
3880 contains the real function addres if we need pointer
3881 equality. We load the GOT entry with the PLT entry. */
3882 asection *plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3883 bfd_put_64 (output_bfd, (plt->output_section->vma
3884 + plt->output_offset
3886 htab->elf.sgot->contents + h->got.offset);
3890 else if (info->shared
3891 && SYMBOL_REFERENCES_LOCAL (info, h))
3893 if (!h->def_regular)
3895 BFD_ASSERT((h->got.offset & 1) != 0);
3896 rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3897 rela.r_addend = (h->root.u.def.value
3898 + h->root.u.def.section->output_section->vma
3899 + h->root.u.def.section->output_offset);
3903 BFD_ASSERT((h->got.offset & 1) == 0);
3905 bfd_put_64 (output_bfd, (bfd_vma) 0,
3906 htab->elf.sgot->contents + h->got.offset);
3907 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
3911 loc = htab->elf.srelgot->contents;
3912 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3913 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3918 Elf_Internal_Rela rela;
3921 /* This symbol needs a copy reloc. Set it up. */
3923 if (h->dynindx == -1
3924 || (h->root.type != bfd_link_hash_defined
3925 && h->root.type != bfd_link_hash_defweak)
3926 || htab->srelbss == NULL)
3929 rela.r_offset = (h->root.u.def.value
3930 + h->root.u.def.section->output_section->vma
3931 + h->root.u.def.section->output_offset);
3932 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
3934 loc = htab->srelbss->contents;
3935 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3936 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3939 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
3940 be NULL for local symbols. */
3942 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
3943 || h == htab->elf.hgot))
3944 sym->st_shndx = SHN_ABS;
3949 /* Finish up local dynamic symbol handling. We set the contents of
3950 various dynamic sections here. */
3953 elf64_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
3955 struct elf_link_hash_entry *h
3956 = (struct elf_link_hash_entry *) *slot;
3957 struct bfd_link_info *info
3958 = (struct bfd_link_info *) inf;
3960 return elf64_x86_64_finish_dynamic_symbol (info->output_bfd,
3964 /* Used to decide how to sort relocs in an optimal manner for the
3965 dynamic linker, before writing them out. */
3967 static enum elf_reloc_type_class
3968 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
3970 switch ((int) ELF64_R_TYPE (rela->r_info))
3972 case R_X86_64_RELATIVE:
3973 return reloc_class_relative;
3974 case R_X86_64_JUMP_SLOT:
3975 return reloc_class_plt;
3977 return reloc_class_copy;
3979 return reloc_class_normal;
3983 /* Finish up the dynamic sections. */
3986 elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3988 struct elf64_x86_64_link_hash_table *htab;
3992 htab = elf64_x86_64_hash_table (info);
3993 dynobj = htab->elf.dynobj;
3994 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3996 if (htab->elf.dynamic_sections_created)
3998 Elf64_External_Dyn *dyncon, *dynconend;
4000 if (sdyn == NULL || htab->elf.sgot == NULL)
4003 dyncon = (Elf64_External_Dyn *) sdyn->contents;
4004 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
4005 for (; dyncon < dynconend; dyncon++)
4007 Elf_Internal_Dyn dyn;
4010 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
4018 s = htab->elf.sgotplt;
4019 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4023 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4027 s = htab->elf.srelplt->output_section;
4028 dyn.d_un.d_val = s->size;
4032 /* The procedure linkage table relocs (DT_JMPREL) should
4033 not be included in the overall relocs (DT_RELA).
4034 Therefore, we override the DT_RELASZ entry here to
4035 make it not include the JMPREL relocs. Since the
4036 linker script arranges for .rela.plt to follow all
4037 other relocation sections, we don't have to worry
4038 about changing the DT_RELA entry. */
4039 if (htab->elf.srelplt != NULL)
4041 s = htab->elf.srelplt->output_section;
4042 dyn.d_un.d_val -= s->size;
4046 case DT_TLSDESC_PLT:
4048 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4049 + htab->tlsdesc_plt;
4052 case DT_TLSDESC_GOT:
4054 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4055 + htab->tlsdesc_got;
4059 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
4062 /* Fill in the special first entry in the procedure linkage table. */
4063 if (htab->elf.splt && htab->elf.splt->size > 0)
4065 /* Fill in the first entry in the procedure linkage table. */
4066 memcpy (htab->elf.splt->contents, elf64_x86_64_plt0_entry,
4068 /* Add offset for pushq GOT+8(%rip), since the instruction
4069 uses 6 bytes subtract this value. */
4070 bfd_put_32 (output_bfd,
4071 (htab->elf.sgotplt->output_section->vma
4072 + htab->elf.sgotplt->output_offset
4074 - htab->elf.splt->output_section->vma
4075 - htab->elf.splt->output_offset
4077 htab->elf.splt->contents + 2);
4078 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4079 the end of the instruction. */
4080 bfd_put_32 (output_bfd,
4081 (htab->elf.sgotplt->output_section->vma
4082 + htab->elf.sgotplt->output_offset
4084 - htab->elf.splt->output_section->vma
4085 - htab->elf.splt->output_offset
4087 htab->elf.splt->contents + 8);
4089 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize =
4092 if (htab->tlsdesc_plt)
4094 bfd_put_64 (output_bfd, (bfd_vma) 0,
4095 htab->elf.sgot->contents + htab->tlsdesc_got);
4097 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4098 elf64_x86_64_plt0_entry,
4101 /* Add offset for pushq GOT+8(%rip), since the
4102 instruction uses 6 bytes subtract this value. */
4103 bfd_put_32 (output_bfd,
4104 (htab->elf.sgotplt->output_section->vma
4105 + htab->elf.sgotplt->output_offset
4107 - htab->elf.splt->output_section->vma
4108 - htab->elf.splt->output_offset
4111 htab->elf.splt->contents + htab->tlsdesc_plt + 2);
4112 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4113 htab->tlsdesc_got. The 12 is the offset to the end of
4115 bfd_put_32 (output_bfd,
4116 (htab->elf.sgot->output_section->vma
4117 + htab->elf.sgot->output_offset
4119 - htab->elf.splt->output_section->vma
4120 - htab->elf.splt->output_offset
4123 htab->elf.splt->contents + htab->tlsdesc_plt + 8);
4128 if (htab->elf.sgotplt)
4130 /* Fill in the first three entries in the global offset table. */
4131 if (htab->elf.sgotplt->size > 0)
4133 /* Set the first entry in the global offset table to the address of
4134 the dynamic section. */
4136 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4138 bfd_put_64 (output_bfd,
4139 sdyn->output_section->vma + sdyn->output_offset,
4140 htab->elf.sgotplt->contents);
4141 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4142 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4143 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4146 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4150 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4151 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4154 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4155 htab_traverse (htab->loc_hash_table,
4156 elf64_x86_64_finish_local_dynamic_symbol,
4162 /* Return address for Ith PLT stub in section PLT, for relocation REL
4163 or (bfd_vma) -1 if it should not be included. */
4166 elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4167 const arelent *rel ATTRIBUTE_UNUSED)
4169 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4172 /* Handle an x86-64 specific section when reading an object file. This
4173 is called when elfcode.h finds a section with an unknown type. */
4176 elf64_x86_64_section_from_shdr (bfd *abfd,
4177 Elf_Internal_Shdr *hdr,
4181 if (hdr->sh_type != SHT_X86_64_UNWIND)
4184 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4190 /* Hook called by the linker routine which adds symbols from an object
4191 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4195 elf64_x86_64_add_symbol_hook (bfd *abfd,
4196 struct bfd_link_info *info,
4197 Elf_Internal_Sym *sym,
4198 const char **namep ATTRIBUTE_UNUSED,
4199 flagword *flagsp ATTRIBUTE_UNUSED,
4205 switch (sym->st_shndx)
4207 case SHN_X86_64_LCOMMON:
4208 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4211 lcomm = bfd_make_section_with_flags (abfd,
4215 | SEC_LINKER_CREATED));
4218 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4221 *valp = sym->st_size;
4225 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4226 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4232 /* Given a BFD section, try to locate the corresponding ELF section
4236 elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4237 asection *sec, int *index)
4239 if (sec == &_bfd_elf_large_com_section)
4241 *index = SHN_X86_64_LCOMMON;
4247 /* Process a symbol. */
4250 elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4253 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4255 switch (elfsym->internal_elf_sym.st_shndx)
4257 case SHN_X86_64_LCOMMON:
4258 asym->section = &_bfd_elf_large_com_section;
4259 asym->value = elfsym->internal_elf_sym.st_size;
4260 /* Common symbol doesn't set BSF_GLOBAL. */
4261 asym->flags &= ~BSF_GLOBAL;
4267 elf64_x86_64_common_definition (Elf_Internal_Sym *sym)
4269 return (sym->st_shndx == SHN_COMMON
4270 || sym->st_shndx == SHN_X86_64_LCOMMON);
4274 elf64_x86_64_common_section_index (asection *sec)
4276 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4279 return SHN_X86_64_LCOMMON;
4283 elf64_x86_64_common_section (asection *sec)
4285 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4286 return bfd_com_section_ptr;
4288 return &_bfd_elf_large_com_section;
4292 elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4293 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4294 struct elf_link_hash_entry *h,
4295 Elf_Internal_Sym *sym,
4297 bfd_vma *pvalue ATTRIBUTE_UNUSED,
4298 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4299 bfd_boolean *skip ATTRIBUTE_UNUSED,
4300 bfd_boolean *override ATTRIBUTE_UNUSED,
4301 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4302 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4303 bfd_boolean *newdef ATTRIBUTE_UNUSED,
4304 bfd_boolean *newdyn,
4305 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4306 bfd_boolean *newweak ATTRIBUTE_UNUSED,
4307 bfd *abfd ATTRIBUTE_UNUSED,
4309 bfd_boolean *olddef ATTRIBUTE_UNUSED,
4310 bfd_boolean *olddyn,
4311 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4312 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
4316 /* A normal common symbol and a large common symbol result in a
4317 normal common symbol. We turn the large common symbol into a
4320 && h->root.type == bfd_link_hash_common
4322 && bfd_is_com_section (*sec)
4325 if (sym->st_shndx == SHN_COMMON
4326 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4328 h->root.u.c.p->section
4329 = bfd_make_section_old_way (oldbfd, "COMMON");
4330 h->root.u.c.p->section->flags = SEC_ALLOC;
4332 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4333 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
4334 *psec = *sec = bfd_com_section_ptr;
4341 elf64_x86_64_additional_program_headers (bfd *abfd,
4342 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4347 /* Check to see if we need a large readonly segment. */
4348 s = bfd_get_section_by_name (abfd, ".lrodata");
4349 if (s && (s->flags & SEC_LOAD))
4352 /* Check to see if we need a large data segment. Since .lbss sections
4353 is placed right after the .bss section, there should be no need for
4354 a large data segment just because of .lbss. */
4355 s = bfd_get_section_by_name (abfd, ".ldata");
4356 if (s && (s->flags & SEC_LOAD))
4362 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4365 elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4367 if (h->plt.offset != (bfd_vma) -1
4369 && !h->pointer_equality_needed)
4372 return _bfd_elf_hash_symbol (h);
4375 static const struct bfd_elf_special_section
4376 elf64_x86_64_special_sections[]=
4378 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4379 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4380 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4381 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4382 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4383 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4384 { NULL, 0, 0, 0, 0 }
4387 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4388 #define TARGET_LITTLE_NAME "elf64-x86-64"
4389 #define ELF_ARCH bfd_arch_i386
4390 #define ELF_MACHINE_CODE EM_X86_64
4391 #define ELF_MAXPAGESIZE 0x200000
4392 #define ELF_MINPAGESIZE 0x1000
4393 #define ELF_COMMONPAGESIZE 0x1000
4395 #define elf_backend_can_gc_sections 1
4396 #define elf_backend_can_refcount 1
4397 #define elf_backend_want_got_plt 1
4398 #define elf_backend_plt_readonly 1
4399 #define elf_backend_want_plt_sym 0
4400 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4401 #define elf_backend_rela_normal 1
4403 #define elf_info_to_howto elf64_x86_64_info_to_howto
4405 #define bfd_elf64_bfd_link_hash_table_create \
4406 elf64_x86_64_link_hash_table_create
4407 #define bfd_elf64_bfd_link_hash_table_free \
4408 elf64_x86_64_link_hash_table_free
4409 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
4410 #define bfd_elf64_bfd_reloc_name_lookup \
4411 elf64_x86_64_reloc_name_lookup
4413 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
4414 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4415 #define elf_backend_check_relocs elf64_x86_64_check_relocs
4416 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4417 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4418 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4419 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4420 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4421 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
4422 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4423 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
4424 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
4425 #define elf_backend_relocate_section elf64_x86_64_relocate_section
4426 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
4427 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
4428 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4429 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
4430 #define elf_backend_object_p elf64_x86_64_elf_object_p
4431 #define bfd_elf64_mkobject elf64_x86_64_mkobject
4433 #define elf_backend_section_from_shdr \
4434 elf64_x86_64_section_from_shdr
4436 #define elf_backend_section_from_bfd_section \
4437 elf64_x86_64_elf_section_from_bfd_section
4438 #define elf_backend_add_symbol_hook \
4439 elf64_x86_64_add_symbol_hook
4440 #define elf_backend_symbol_processing \
4441 elf64_x86_64_symbol_processing
4442 #define elf_backend_common_section_index \
4443 elf64_x86_64_common_section_index
4444 #define elf_backend_common_section \
4445 elf64_x86_64_common_section
4446 #define elf_backend_common_definition \
4447 elf64_x86_64_common_definition
4448 #define elf_backend_merge_symbol \
4449 elf64_x86_64_merge_symbol
4450 #define elf_backend_special_sections \
4451 elf64_x86_64_special_sections
4452 #define elf_backend_additional_program_headers \
4453 elf64_x86_64_additional_program_headers
4454 #define elf_backend_hash_symbol \
4455 elf64_x86_64_hash_symbol
4457 #undef elf_backend_post_process_headers
4458 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4460 #include "elf64-target.h"
4462 /* FreeBSD support. */
4464 #undef TARGET_LITTLE_SYM
4465 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4466 #undef TARGET_LITTLE_NAME
4467 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4470 #define ELF_OSABI ELFOSABI_FREEBSD
4473 #define elf64_bed elf64_x86_64_fbsd_bed
4475 #include "elf64-target.h"