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"
30 #include "elf/x86-64.h"
32 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
33 #define MINUS_ONE (~ (bfd_vma) 0)
35 /* The relocation "howto" table. Order of fields:
36 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
37 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
38 static reloc_howto_type x86_64_elf_howto_table[] =
40 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
41 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
43 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
46 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
47 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
49 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
50 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
52 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
53 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
55 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
58 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
61 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
64 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
67 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
68 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
70 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
71 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
73 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
74 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
76 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
78 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
80 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
82 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
83 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
84 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
87 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
90 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
93 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
94 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
96 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
97 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
99 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
100 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
102 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
103 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
105 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
106 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
108 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
111 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
113 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
114 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
115 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
116 FALSE, 0xffffffff, 0xffffffff, TRUE),
117 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
118 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
120 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
121 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
123 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
124 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
125 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
126 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
127 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
129 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
130 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
134 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
135 complain_overflow_bitfield, bfd_elf_generic_reloc,
136 "R_X86_64_GOTPC32_TLSDESC",
137 FALSE, 0xffffffff, 0xffffffff, TRUE),
138 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
139 complain_overflow_dont, bfd_elf_generic_reloc,
140 "R_X86_64_TLSDESC_CALL",
142 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
143 complain_overflow_bitfield, bfd_elf_generic_reloc,
145 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
146 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
150 /* We have a gap in the reloc numbers here.
151 R_X86_64_standard counts the number up to this point, and
152 R_X86_64_vt_offset is the value to subtract from a reloc type of
153 R_X86_64_GNU_VT* to form an index into this table. */
154 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
155 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
157 /* GNU extension to record C++ vtable hierarchy. */
158 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
159 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
161 /* GNU extension to record C++ vtable member usage. */
162 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
163 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
167 #define IS_X86_64_PCREL_TYPE(TYPE) \
168 ( ((TYPE) == R_X86_64_PC8) \
169 || ((TYPE) == R_X86_64_PC16) \
170 || ((TYPE) == R_X86_64_PC32) \
171 || ((TYPE) == R_X86_64_PC64))
173 /* Map BFD relocs to the x86_64 elf relocs. */
176 bfd_reloc_code_real_type bfd_reloc_val;
177 unsigned char elf_reloc_val;
180 static const struct elf_reloc_map x86_64_reloc_map[] =
182 { BFD_RELOC_NONE, R_X86_64_NONE, },
183 { BFD_RELOC_64, R_X86_64_64, },
184 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
185 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
186 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
187 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
188 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
189 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
190 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
191 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
192 { BFD_RELOC_32, R_X86_64_32, },
193 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
194 { BFD_RELOC_16, R_X86_64_16, },
195 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
196 { BFD_RELOC_8, R_X86_64_8, },
197 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
198 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
199 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
200 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
201 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
202 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
203 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
204 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
205 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
206 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
207 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
208 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
209 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
210 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
211 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
212 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
213 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
214 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
215 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
216 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
217 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
218 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
219 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
222 static reloc_howto_type *
223 elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
227 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
228 || r_type >= (unsigned int) R_X86_64_max)
230 if (r_type >= (unsigned int) R_X86_64_standard)
232 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
234 r_type = R_X86_64_NONE;
239 i = r_type - (unsigned int) R_X86_64_vt_offset;
240 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
241 return &x86_64_elf_howto_table[i];
244 /* Given a BFD reloc type, return a HOWTO structure. */
245 static reloc_howto_type *
246 elf64_x86_64_reloc_type_lookup (bfd *abfd,
247 bfd_reloc_code_real_type code)
251 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
254 if (x86_64_reloc_map[i].bfd_reloc_val == code)
255 return elf64_x86_64_rtype_to_howto (abfd,
256 x86_64_reloc_map[i].elf_reloc_val);
261 static reloc_howto_type *
262 elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
268 i < (sizeof (x86_64_elf_howto_table)
269 / sizeof (x86_64_elf_howto_table[0]));
271 if (x86_64_elf_howto_table[i].name != NULL
272 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
273 return &x86_64_elf_howto_table[i];
278 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
281 elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
282 Elf_Internal_Rela *dst)
286 r_type = ELF64_R_TYPE (dst->r_info);
287 cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type);
288 BFD_ASSERT (r_type == cache_ptr->howto->type);
291 /* Support for core dump NOTE sections. */
293 elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
298 switch (note->descsz)
303 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
305 elf_tdata (abfd)->core_signal
306 = bfd_get_16 (abfd, note->descdata + 12);
309 elf_tdata (abfd)->core_pid
310 = bfd_get_32 (abfd, note->descdata + 32);
319 /* Make a ".reg/999" section. */
320 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
321 size, note->descpos + offset);
325 elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
327 switch (note->descsz)
332 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
333 elf_tdata (abfd)->core_program
334 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
335 elf_tdata (abfd)->core_command
336 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
339 /* Note that for some reason, a spurious space is tacked
340 onto the end of the args in some (at least one anyway)
341 implementations, so strip it off if it exists. */
344 char *command = elf_tdata (abfd)->core_command;
345 int n = strlen (command);
347 if (0 < n && command[n - 1] == ' ')
348 command[n - 1] = '\0';
354 /* Functions for the x86-64 ELF linker. */
356 /* The name of the dynamic interpreter. This is put in the .interp
359 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
361 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
362 copying dynamic variables from a shared lib into an app's dynbss
363 section, and instead use a dynamic relocation to point into the
365 #define ELIMINATE_COPY_RELOCS 1
367 /* The size in bytes of an entry in the global offset table. */
369 #define GOT_ENTRY_SIZE 8
371 /* The size in bytes of an entry in the procedure linkage table. */
373 #define PLT_ENTRY_SIZE 16
375 /* The first entry in a procedure linkage table looks like this. See the
376 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
378 static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
380 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
381 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
382 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
385 /* Subsequent entries in a procedure linkage table look like this. */
387 static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
389 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
390 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
391 0x68, /* pushq immediate */
392 0, 0, 0, 0, /* replaced with index into relocation table. */
393 0xe9, /* jmp relative */
394 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
397 /* The x86-64 linker needs to keep track of the number of relocs that
398 it decides to copy as dynamic relocs in check_relocs for each symbol.
399 This is so that it can later discard them if they are found to be
400 unnecessary. We store the information in a field extending the
401 regular ELF linker hash table. */
403 struct elf64_x86_64_dyn_relocs
406 struct elf64_x86_64_dyn_relocs *next;
408 /* The input section of the reloc. */
411 /* Total number of relocs copied for the input section. */
414 /* Number of pc-relative relocs copied for the input section. */
415 bfd_size_type pc_count;
418 /* x86-64 ELF linker hash entry. */
420 struct elf64_x86_64_link_hash_entry
422 struct elf_link_hash_entry elf;
424 /* Track dynamic relocs copied for this symbol. */
425 struct elf64_x86_64_dyn_relocs *dyn_relocs;
427 #define GOT_UNKNOWN 0
431 #define GOT_TLS_GDESC 4
432 #define GOT_TLS_GD_BOTH_P(type) \
433 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
434 #define GOT_TLS_GD_P(type) \
435 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
436 #define GOT_TLS_GDESC_P(type) \
437 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
438 #define GOT_TLS_GD_ANY_P(type) \
439 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
440 unsigned char tls_type;
442 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
443 starting at the end of the jump table. */
447 #define elf64_x86_64_hash_entry(ent) \
448 ((struct elf64_x86_64_link_hash_entry *)(ent))
450 struct elf64_x86_64_obj_tdata
452 struct elf_obj_tdata root;
454 /* tls_type for each local got entry. */
455 char *local_got_tls_type;
457 /* GOTPLT entries for TLS descriptors. */
458 bfd_vma *local_tlsdesc_gotent;
461 #define elf64_x86_64_tdata(abfd) \
462 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
464 #define elf64_x86_64_local_got_tls_type(abfd) \
465 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
467 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
468 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
470 #define is_x86_64_elf(bfd) \
471 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
472 && elf_tdata (bfd) != NULL \
473 && elf_object_id (bfd) == X86_64_ELF_TDATA)
476 elf64_x86_64_mkobject (bfd *abfd)
478 return bfd_elf_allocate_object (abfd, sizeof (struct elf64_x86_64_obj_tdata),
482 /* x86-64 ELF linker hash table. */
484 struct elf64_x86_64_link_hash_table
486 struct elf_link_hash_table elf;
488 /* Short-cuts to get to dynamic linker sections. */
500 /* The offset into splt of the PLT entry for the TLS descriptor
501 resolver. Special values are 0, if not necessary (or not found
502 to be necessary yet), and -1 if needed but not determined
505 /* The offset into sgot of the GOT entry used by the PLT entry
510 bfd_signed_vma refcount;
514 /* The amount of space used by the jump slots in the GOT. */
515 bfd_vma sgotplt_jump_table_size;
517 /* Small local sym to section mapping cache. */
518 struct sym_sec_cache sym_sec;
520 /* _TLS_MODULE_BASE_ symbol. */
521 struct bfd_link_hash_entry *tls_module_base;
524 /* Get the x86-64 ELF linker hash table from a link_info structure. */
526 #define elf64_x86_64_hash_table(p) \
527 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
529 #define elf64_x86_64_compute_jump_table_size(htab) \
530 ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE)
532 /* Create an entry in an x86-64 ELF linker hash table. */
534 static struct bfd_hash_entry *
535 elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
536 struct bfd_hash_table *table,
539 /* Allocate the structure if it has not already been allocated by a
543 entry = bfd_hash_allocate (table,
544 sizeof (struct elf64_x86_64_link_hash_entry));
549 /* Call the allocation method of the superclass. */
550 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
553 struct elf64_x86_64_link_hash_entry *eh;
555 eh = (struct elf64_x86_64_link_hash_entry *) entry;
556 eh->dyn_relocs = NULL;
557 eh->tls_type = GOT_UNKNOWN;
558 eh->tlsdesc_got = (bfd_vma) -1;
564 /* Create an X86-64 ELF linker hash table. */
566 static struct bfd_link_hash_table *
567 elf64_x86_64_link_hash_table_create (bfd *abfd)
569 struct elf64_x86_64_link_hash_table *ret;
570 bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
572 ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
576 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
577 elf64_x86_64_link_hash_newfunc,
578 sizeof (struct elf64_x86_64_link_hash_entry)))
594 ret->sym_sec.abfd = NULL;
595 ret->tlsdesc_plt = 0;
596 ret->tlsdesc_got = 0;
597 ret->tls_ld_got.refcount = 0;
598 ret->sgotplt_jump_table_size = 0;
599 ret->tls_module_base = NULL;
601 return &ret->elf.root;
604 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
605 shortcuts to them in our hash table. */
608 elf64_x86_64_create_got_section (bfd *dynobj, struct bfd_link_info *info)
610 struct elf64_x86_64_link_hash_table *htab;
612 if (! _bfd_elf_create_got_section (dynobj, info))
615 htab = elf64_x86_64_hash_table (info);
616 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
617 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
618 if (!htab->sgot || !htab->sgotplt)
621 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
622 (SEC_ALLOC | SEC_LOAD
627 if (htab->srelgot == NULL
628 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
633 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
634 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
638 elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
640 struct elf64_x86_64_link_hash_table *htab;
642 htab = elf64_x86_64_hash_table (info);
643 if (!htab->sgot && !elf64_x86_64_create_got_section (dynobj, info))
646 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
649 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
650 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
651 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
653 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
655 if (!htab->splt || !htab->srelplt || !htab->sdynbss
656 || (!info->shared && !htab->srelbss))
662 /* Copy the extra info we tack onto an elf_link_hash_entry. */
665 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
666 struct elf_link_hash_entry *dir,
667 struct elf_link_hash_entry *ind)
669 struct elf64_x86_64_link_hash_entry *edir, *eind;
671 edir = (struct elf64_x86_64_link_hash_entry *) dir;
672 eind = (struct elf64_x86_64_link_hash_entry *) ind;
674 if (eind->dyn_relocs != NULL)
676 if (edir->dyn_relocs != NULL)
678 struct elf64_x86_64_dyn_relocs **pp;
679 struct elf64_x86_64_dyn_relocs *p;
681 /* Add reloc counts against the indirect sym to the direct sym
682 list. Merge any entries against the same section. */
683 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
685 struct elf64_x86_64_dyn_relocs *q;
687 for (q = edir->dyn_relocs; q != NULL; q = q->next)
688 if (q->sec == p->sec)
690 q->pc_count += p->pc_count;
691 q->count += p->count;
698 *pp = edir->dyn_relocs;
701 edir->dyn_relocs = eind->dyn_relocs;
702 eind->dyn_relocs = NULL;
705 if (ind->root.type == bfd_link_hash_indirect
706 && dir->got.refcount <= 0)
708 edir->tls_type = eind->tls_type;
709 eind->tls_type = GOT_UNKNOWN;
712 if (ELIMINATE_COPY_RELOCS
713 && ind->root.type != bfd_link_hash_indirect
714 && dir->dynamic_adjusted)
716 /* If called to transfer flags for a weakdef during processing
717 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
718 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
719 dir->ref_dynamic |= ind->ref_dynamic;
720 dir->ref_regular |= ind->ref_regular;
721 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
722 dir->needs_plt |= ind->needs_plt;
723 dir->pointer_equality_needed |= ind->pointer_equality_needed;
726 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
730 elf64_x86_64_elf_object_p (bfd *abfd)
732 /* Set the right machine number for an x86-64 elf64 file. */
733 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
751 /* Return TRUE if the TLS access code sequence support transition
755 elf64_x86_64_check_tls_transition (bfd *abfd, asection *sec,
757 Elf_Internal_Shdr *symtab_hdr,
758 struct elf_link_hash_entry **sym_hashes,
760 const Elf_Internal_Rela *rel,
761 const Elf_Internal_Rela *relend)
764 unsigned long r_symndx;
765 struct elf_link_hash_entry *h;
768 /* Get the section contents. */
769 if (contents == NULL)
771 if (elf_section_data (sec)->this_hdr.contents != NULL)
772 contents = elf_section_data (sec)->this_hdr.contents;
775 /* FIXME: How to better handle error condition? */
776 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
779 /* Cache the section contents for elf_link_input_bfd. */
780 elf_section_data (sec)->this_hdr.contents = contents;
784 offset = rel->r_offset;
789 if ((rel + 1) >= relend)
792 if (r_type == R_X86_64_TLSGD)
794 /* Check transition from GD access model. Only
795 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
796 .word 0x6666; rex64; call __tls_get_addr
797 can transit to different access model. */
799 static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
800 call = { { 0x66, 0x66, 0x48, 0xe8 } };
802 || (offset + 12) > sec->size
803 || bfd_get_32 (abfd, contents + offset - 4) != leaq.i
804 || bfd_get_32 (abfd, contents + offset + 4) != call.i)
809 /* Check transition from LD access model. Only
810 leaq foo@tlsld(%rip), %rdi;
812 can transit to different access model. */
814 static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
817 if (offset < 3 || (offset + 9) > sec->size)
820 op.i = bfd_get_32 (abfd, contents + offset - 3);
821 op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
826 r_symndx = ELF64_R_SYM (rel[1].r_info);
827 if (r_symndx < symtab_hdr->sh_info)
830 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
831 /* Use strncmp to check __tls_get_addr since __tls_get_addr
834 && h->root.root.string != NULL
835 && (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PC32
836 || ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
837 && (strncmp (h->root.root.string,
838 "__tls_get_addr", 14) == 0));
840 case R_X86_64_GOTTPOFF:
841 /* Check transition from IE access model:
842 movq foo@gottpoff(%rip), %reg
843 addq foo@gottpoff(%rip), %reg
846 if (offset < 3 || (offset + 4) > sec->size)
849 val = bfd_get_8 (abfd, contents + offset - 3);
850 if (val != 0x48 && val != 0x4c)
853 val = bfd_get_8 (abfd, contents + offset - 2);
854 if (val != 0x8b && val != 0x03)
857 val = bfd_get_8 (abfd, contents + offset - 1);
858 return (val & 0xc7) == 5;
860 case R_X86_64_GOTPC32_TLSDESC:
861 /* Check transition from GDesc access model:
862 leaq x@tlsdesc(%rip), %rax
864 Make sure it's a leaq adding rip to a 32-bit offset
865 into any register, although it's probably almost always
868 if (offset < 3 || (offset + 4) > sec->size)
871 val = bfd_get_8 (abfd, contents + offset - 3);
872 if ((val & 0xfb) != 0x48)
875 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
878 val = bfd_get_8 (abfd, contents + offset - 1);
879 return (val & 0xc7) == 0x05;
881 case R_X86_64_TLSDESC_CALL:
882 /* Check transition from GDesc access model:
883 call *x@tlsdesc(%rax)
885 if (offset + 2 <= sec->size)
887 /* Make sure that it's a call *x@tlsdesc(%rax). */
888 static x86_64_opcode16 call = { { 0xff, 0x10 } };
889 return bfd_get_16 (abfd, contents + offset) == call.i;
899 /* Return TRUE if the TLS access transition is OK or no transition
900 will be performed. Update R_TYPE if there is a transition. */
903 elf64_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
904 asection *sec, bfd_byte *contents,
905 Elf_Internal_Shdr *symtab_hdr,
906 struct elf_link_hash_entry **sym_hashes,
907 unsigned int *r_type, int tls_type,
908 const Elf_Internal_Rela *rel,
909 const Elf_Internal_Rela *relend,
910 struct elf_link_hash_entry *h)
912 unsigned int from_type = *r_type;
913 unsigned int to_type = from_type;
914 bfd_boolean check = TRUE;
919 case R_X86_64_GOTPC32_TLSDESC:
920 case R_X86_64_TLSDESC_CALL:
921 case R_X86_64_GOTTPOFF:
925 to_type = R_X86_64_TPOFF32;
927 to_type = R_X86_64_GOTTPOFF;
930 /* When we are called from elf64_x86_64_relocate_section,
931 CONTENTS isn't NULL and there may be additional transitions
932 based on TLS_TYPE. */
933 if (contents != NULL)
935 unsigned int new_to_type = to_type;
940 && tls_type == GOT_TLS_IE)
941 new_to_type = R_X86_64_TPOFF32;
943 if (to_type == R_X86_64_TLSGD
944 || to_type == R_X86_64_GOTPC32_TLSDESC
945 || to_type == R_X86_64_TLSDESC_CALL)
947 if (tls_type == GOT_TLS_IE)
948 new_to_type = R_X86_64_GOTTPOFF;
951 /* We checked the transition before when we were called from
952 elf64_x86_64_check_relocs. We only want to check the new
953 transition which hasn't been checked before. */
954 check = new_to_type != to_type && from_type == to_type;
955 to_type = new_to_type;
962 to_type = R_X86_64_TPOFF32;
969 /* Return TRUE if there is no transition. */
970 if (from_type == to_type)
973 /* Check if the transition can be performed. */
975 && ! elf64_x86_64_check_tls_transition (abfd, sec, contents,
976 symtab_hdr, sym_hashes,
977 from_type, rel, relend))
979 reloc_howto_type *from, *to;
981 from = elf64_x86_64_rtype_to_howto (abfd, from_type);
982 to = elf64_x86_64_rtype_to_howto (abfd, to_type);
984 (*_bfd_error_handler)
985 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
986 "in section `%A' failed"),
987 abfd, sec, from->name, to->name,
988 h ? h->root.root.string : "a local symbol",
989 (unsigned long) rel->r_offset);
990 bfd_set_error (bfd_error_bad_value);
998 /* Look through the relocs for a section during the first phase, and
999 calculate needed space in the global offset table, procedure
1000 linkage table, and dynamic reloc sections. */
1003 elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1005 const Elf_Internal_Rela *relocs)
1007 struct elf64_x86_64_link_hash_table *htab;
1008 Elf_Internal_Shdr *symtab_hdr;
1009 struct elf_link_hash_entry **sym_hashes;
1010 const Elf_Internal_Rela *rel;
1011 const Elf_Internal_Rela *rel_end;
1014 if (info->relocatable)
1017 BFD_ASSERT (is_x86_64_elf (abfd));
1019 htab = elf64_x86_64_hash_table (info);
1020 symtab_hdr = &elf_symtab_hdr (abfd);
1021 sym_hashes = elf_sym_hashes (abfd);
1025 rel_end = relocs + sec->reloc_count;
1026 for (rel = relocs; rel < rel_end; rel++)
1028 unsigned int r_type;
1029 unsigned long r_symndx;
1030 struct elf_link_hash_entry *h;
1032 r_symndx = ELF64_R_SYM (rel->r_info);
1033 r_type = ELF64_R_TYPE (rel->r_info);
1035 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1037 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1042 if (r_symndx < symtab_hdr->sh_info)
1046 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1047 while (h->root.type == bfd_link_hash_indirect
1048 || h->root.type == bfd_link_hash_warning)
1049 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1051 /* Create the ifunc sections for static executables. If we
1052 never see an indirect function symbol nor we are building
1053 a static executable, those sections will be empty and
1054 won't appear in output. */
1065 case R_X86_64_PLT32:
1066 case R_X86_64_GOTPCREL:
1067 case R_X86_64_GOTPCREL64:
1068 if (!info->shared && htab->iplt == NULL)
1070 if (!_bfd_elf_create_static_ifunc_sections (abfd,
1074 htab->iplt = bfd_get_section_by_name (abfd, ".iplt");
1075 htab->irelplt = bfd_get_section_by_name (abfd,
1077 htab->igotplt = bfd_get_section_by_name (abfd,
1087 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1088 it here if it is defined in a non-shared object. */
1089 if (h->type == STT_GNU_IFUNC
1092 /* It is referenced by a non-shared object. */
1095 /* STT_GNU_IFUNC symbol must go through PLT. */
1096 h->plt.refcount += 1;
1098 /* STT_GNU_IFUNC needs dynamic sections. */
1099 if (htab->elf.dynobj == NULL)
1100 htab->elf.dynobj = abfd;
1105 (*_bfd_error_handler)
1106 (_("%B: relocation %s against STT_GNU_IFUNC "
1107 "symbol `%s' isn't handled by %s"), abfd,
1108 x86_64_elf_howto_table[r_type].name,
1109 h->root.root.string, __FUNCTION__);
1110 bfd_set_error (bfd_error_bad_value);
1119 if (r_type != R_X86_64_PC32
1120 && r_type != R_X86_64_PC64)
1121 h->pointer_equality_needed = 1;
1124 case R_X86_64_PLT32:
1127 case R_X86_64_GOTPCREL:
1128 case R_X86_64_GOTPCREL64:
1129 h->got.refcount += 1;
1130 if (htab->sgot == NULL
1131 && !elf64_x86_64_create_got_section (htab->elf.dynobj,
1141 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1142 symtab_hdr, sym_hashes,
1143 &r_type, GOT_UNKNOWN,
1149 case R_X86_64_TLSLD:
1150 htab->tls_ld_got.refcount += 1;
1153 case R_X86_64_TPOFF32:
1156 (*_bfd_error_handler)
1157 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1159 x86_64_elf_howto_table[r_type].name,
1160 (h) ? h->root.root.string : "a local symbol");
1161 bfd_set_error (bfd_error_bad_value);
1166 case R_X86_64_GOTTPOFF:
1168 info->flags |= DF_STATIC_TLS;
1171 case R_X86_64_GOT32:
1172 case R_X86_64_GOTPCREL:
1173 case R_X86_64_TLSGD:
1174 case R_X86_64_GOT64:
1175 case R_X86_64_GOTPCREL64:
1176 case R_X86_64_GOTPLT64:
1177 case R_X86_64_GOTPC32_TLSDESC:
1178 case R_X86_64_TLSDESC_CALL:
1179 /* This symbol requires a global offset table entry. */
1181 int tls_type, old_tls_type;
1185 default: tls_type = GOT_NORMAL; break;
1186 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1187 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1188 case R_X86_64_GOTPC32_TLSDESC:
1189 case R_X86_64_TLSDESC_CALL:
1190 tls_type = GOT_TLS_GDESC; break;
1195 if (r_type == R_X86_64_GOTPLT64)
1197 /* This relocation indicates that we also need
1198 a PLT entry, as this is a function. We don't need
1199 a PLT entry for local symbols. */
1201 h->plt.refcount += 1;
1203 h->got.refcount += 1;
1204 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1208 bfd_signed_vma *local_got_refcounts;
1210 /* This is a global offset table entry for a local symbol. */
1211 local_got_refcounts = elf_local_got_refcounts (abfd);
1212 if (local_got_refcounts == NULL)
1216 size = symtab_hdr->sh_info;
1217 size *= sizeof (bfd_signed_vma)
1218 + sizeof (bfd_vma) + sizeof (char);
1219 local_got_refcounts = ((bfd_signed_vma *)
1220 bfd_zalloc (abfd, size));
1221 if (local_got_refcounts == NULL)
1223 elf_local_got_refcounts (abfd) = local_got_refcounts;
1224 elf64_x86_64_local_tlsdesc_gotent (abfd)
1225 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1226 elf64_x86_64_local_got_tls_type (abfd)
1227 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1229 local_got_refcounts[r_symndx] += 1;
1231 = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
1234 /* If a TLS symbol is accessed using IE at least once,
1235 there is no point to use dynamic model for it. */
1236 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1237 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1238 || tls_type != GOT_TLS_IE))
1240 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1241 tls_type = old_tls_type;
1242 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1243 && GOT_TLS_GD_ANY_P (tls_type))
1244 tls_type |= old_tls_type;
1247 (*_bfd_error_handler)
1248 (_("%B: '%s' accessed both as normal and thread local symbol"),
1249 abfd, h ? h->root.root.string : "<local>");
1254 if (old_tls_type != tls_type)
1257 elf64_x86_64_hash_entry (h)->tls_type = tls_type;
1259 elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1264 case R_X86_64_GOTOFF64:
1265 case R_X86_64_GOTPC32:
1266 case R_X86_64_GOTPC64:
1268 if (htab->sgot == NULL)
1270 if (htab->elf.dynobj == NULL)
1271 htab->elf.dynobj = abfd;
1272 if (!elf64_x86_64_create_got_section (htab->elf.dynobj,
1278 case R_X86_64_PLT32:
1279 /* This symbol requires a procedure linkage table entry. We
1280 actually build the entry in adjust_dynamic_symbol,
1281 because this might be a case of linking PIC code which is
1282 never referenced by a dynamic object, in which case we
1283 don't need to generate a procedure linkage table entry
1286 /* If this is a local symbol, we resolve it directly without
1287 creating a procedure linkage table entry. */
1292 h->plt.refcount += 1;
1295 case R_X86_64_PLTOFF64:
1296 /* This tries to form the 'address' of a function relative
1297 to GOT. For global symbols we need a PLT entry. */
1301 h->plt.refcount += 1;
1309 /* Let's help debug shared library creation. These relocs
1310 cannot be used in shared libs. Don't error out for
1311 sections we don't care about, such as debug sections or
1312 non-constant sections. */
1314 && (sec->flags & SEC_ALLOC) != 0
1315 && (sec->flags & SEC_READONLY) != 0)
1317 (*_bfd_error_handler)
1318 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1320 x86_64_elf_howto_table[r_type].name,
1321 (h) ? h->root.root.string : "a local symbol");
1322 bfd_set_error (bfd_error_bad_value);
1332 if (h != NULL && !info->shared)
1334 /* If this reloc is in a read-only section, we might
1335 need a copy reloc. We can't check reliably at this
1336 stage whether the section is read-only, as input
1337 sections have not yet been mapped to output sections.
1338 Tentatively set the flag for now, and correct in
1339 adjust_dynamic_symbol. */
1342 /* We may need a .plt entry if the function this reloc
1343 refers to is in a shared lib. */
1344 h->plt.refcount += 1;
1345 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1346 h->pointer_equality_needed = 1;
1349 /* If we are creating a shared library, and this is a reloc
1350 against a global symbol, or a non PC relative reloc
1351 against a local symbol, then we need to copy the reloc
1352 into the shared library. However, if we are linking with
1353 -Bsymbolic, we do not need to copy a reloc against a
1354 global symbol which is defined in an object we are
1355 including in the link (i.e., DEF_REGULAR is set). At
1356 this point we have not seen all the input files, so it is
1357 possible that DEF_REGULAR is not set now but will be set
1358 later (it is never cleared). In case of a weak definition,
1359 DEF_REGULAR may be cleared later by a strong definition in
1360 a shared library. We account for that possibility below by
1361 storing information in the relocs_copied field of the hash
1362 table entry. A similar situation occurs when creating
1363 shared libraries and symbol visibility changes render the
1366 If on the other hand, we are creating an executable, we
1367 may need to keep relocations for symbols satisfied by a
1368 dynamic library if we manage to avoid copy relocs for the
1371 && (sec->flags & SEC_ALLOC) != 0
1372 && (! IS_X86_64_PCREL_TYPE (r_type)
1374 && (! SYMBOLIC_BIND (info, h)
1375 || h->root.type == bfd_link_hash_defweak
1376 || !h->def_regular))))
1377 || (ELIMINATE_COPY_RELOCS
1379 && (sec->flags & SEC_ALLOC) != 0
1381 && (h->root.type == bfd_link_hash_defweak
1382 || !h->def_regular)))
1384 struct elf64_x86_64_dyn_relocs *p;
1385 struct elf64_x86_64_dyn_relocs **head;
1387 /* We must copy these reloc types into the output file.
1388 Create a reloc section in dynobj and make room for
1392 if (htab->elf.dynobj == NULL)
1393 htab->elf.dynobj = abfd;
1395 sreloc = _bfd_elf_make_dynamic_reloc_section
1396 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1402 /* If this is a global symbol, we count the number of
1403 relocations we need for this symbol. */
1406 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
1411 /* Track dynamic relocs needed for local syms too.
1412 We really need local syms available to do this
1416 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1421 /* Beware of type punned pointers vs strict aliasing
1423 vpp = &(elf_section_data (s)->local_dynrel);
1424 head = (struct elf64_x86_64_dyn_relocs **)vpp;
1428 if (p == NULL || p->sec != sec)
1430 bfd_size_type amt = sizeof *p;
1432 p = ((struct elf64_x86_64_dyn_relocs *)
1433 bfd_alloc (htab->elf.dynobj, amt));
1444 if (IS_X86_64_PCREL_TYPE (r_type))
1449 /* This relocation describes the C++ object vtable hierarchy.
1450 Reconstruct it for later use during GC. */
1451 case R_X86_64_GNU_VTINHERIT:
1452 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1456 /* This relocation describes which C++ vtable entries are actually
1457 used. Record for later use during GC. */
1458 case R_X86_64_GNU_VTENTRY:
1459 BFD_ASSERT (h != NULL);
1461 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1473 /* Return the section that should be marked against GC for a given
1477 elf64_x86_64_gc_mark_hook (asection *sec,
1478 struct bfd_link_info *info,
1479 Elf_Internal_Rela *rel,
1480 struct elf_link_hash_entry *h,
1481 Elf_Internal_Sym *sym)
1484 switch (ELF64_R_TYPE (rel->r_info))
1486 case R_X86_64_GNU_VTINHERIT:
1487 case R_X86_64_GNU_VTENTRY:
1491 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1494 /* Update the got entry reference counts for the section being removed. */
1497 elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1499 const Elf_Internal_Rela *relocs)
1501 Elf_Internal_Shdr *symtab_hdr;
1502 struct elf_link_hash_entry **sym_hashes;
1503 bfd_signed_vma *local_got_refcounts;
1504 const Elf_Internal_Rela *rel, *relend;
1506 if (info->relocatable)
1509 elf_section_data (sec)->local_dynrel = NULL;
1511 symtab_hdr = &elf_symtab_hdr (abfd);
1512 sym_hashes = elf_sym_hashes (abfd);
1513 local_got_refcounts = elf_local_got_refcounts (abfd);
1515 relend = relocs + sec->reloc_count;
1516 for (rel = relocs; rel < relend; rel++)
1518 unsigned long r_symndx;
1519 unsigned int r_type;
1520 struct elf_link_hash_entry *h = NULL;
1522 r_symndx = ELF64_R_SYM (rel->r_info);
1523 if (r_symndx >= symtab_hdr->sh_info)
1525 struct elf64_x86_64_link_hash_entry *eh;
1526 struct elf64_x86_64_dyn_relocs **pp;
1527 struct elf64_x86_64_dyn_relocs *p;
1529 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1530 while (h->root.type == bfd_link_hash_indirect
1531 || h->root.type == bfd_link_hash_warning)
1532 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1533 eh = (struct elf64_x86_64_link_hash_entry *) h;
1535 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1538 /* Everything must go for SEC. */
1544 r_type = ELF64_R_TYPE (rel->r_info);
1545 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1546 symtab_hdr, sym_hashes,
1547 &r_type, GOT_UNKNOWN,
1553 case R_X86_64_TLSLD:
1554 if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0)
1555 elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1;
1558 case R_X86_64_TLSGD:
1559 case R_X86_64_GOTPC32_TLSDESC:
1560 case R_X86_64_TLSDESC_CALL:
1561 case R_X86_64_GOTTPOFF:
1562 case R_X86_64_GOT32:
1563 case R_X86_64_GOTPCREL:
1564 case R_X86_64_GOT64:
1565 case R_X86_64_GOTPCREL64:
1566 case R_X86_64_GOTPLT64:
1569 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1570 h->plt.refcount -= 1;
1571 if (h->got.refcount > 0)
1572 h->got.refcount -= 1;
1574 else if (local_got_refcounts != NULL)
1576 if (local_got_refcounts[r_symndx] > 0)
1577 local_got_refcounts[r_symndx] -= 1;
1594 case R_X86_64_PLT32:
1595 case R_X86_64_PLTOFF64:
1598 if (h->plt.refcount > 0)
1599 h->plt.refcount -= 1;
1611 /* Adjust a symbol defined by a dynamic object and referenced by a
1612 regular object. The current definition is in some section of the
1613 dynamic object, but we're not including those sections. We have to
1614 change the definition to something the rest of the link can
1618 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1619 struct elf_link_hash_entry *h)
1621 struct elf64_x86_64_link_hash_table *htab;
1624 /* STT_GNU_IFUNC symbol must go through PLT. */
1625 if (h->type == STT_GNU_IFUNC)
1627 if (h->plt.refcount <= 0)
1629 h->plt.offset = (bfd_vma) -1;
1635 /* If this is a function, put it in the procedure linkage table. We
1636 will fill in the contents of the procedure linkage table later,
1637 when we know the address of the .got section. */
1638 if (h->type == STT_FUNC
1641 if (h->plt.refcount <= 0
1642 || SYMBOL_CALLS_LOCAL (info, h)
1643 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1644 && h->root.type == bfd_link_hash_undefweak))
1646 /* This case can occur if we saw a PLT32 reloc in an input
1647 file, but the symbol was never referred to by a dynamic
1648 object, or if all references were garbage collected. In
1649 such a case, we don't actually need to build a procedure
1650 linkage table, and we can just do a PC32 reloc instead. */
1651 h->plt.offset = (bfd_vma) -1;
1658 /* It's possible that we incorrectly decided a .plt reloc was
1659 needed for an R_X86_64_PC32 reloc to a non-function sym in
1660 check_relocs. We can't decide accurately between function and
1661 non-function syms in check-relocs; Objects loaded later in
1662 the link may change h->type. So fix it now. */
1663 h->plt.offset = (bfd_vma) -1;
1665 /* If this is a weak symbol, and there is a real definition, the
1666 processor independent code will have arranged for us to see the
1667 real definition first, and we can just use the same value. */
1668 if (h->u.weakdef != NULL)
1670 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1671 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1672 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1673 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1674 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1675 h->non_got_ref = h->u.weakdef->non_got_ref;
1679 /* This is a reference to a symbol defined by a dynamic object which
1680 is not a function. */
1682 /* If we are creating a shared library, we must presume that the
1683 only references to the symbol are via the global offset table.
1684 For such cases we need not do anything here; the relocations will
1685 be handled correctly by relocate_section. */
1689 /* If there are no references to this symbol that do not use the
1690 GOT, we don't need to generate a copy reloc. */
1691 if (!h->non_got_ref)
1694 /* If -z nocopyreloc was given, we won't generate them either. */
1695 if (info->nocopyreloc)
1701 if (ELIMINATE_COPY_RELOCS)
1703 struct elf64_x86_64_link_hash_entry * eh;
1704 struct elf64_x86_64_dyn_relocs *p;
1706 eh = (struct elf64_x86_64_link_hash_entry *) h;
1707 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1709 s = p->sec->output_section;
1710 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1714 /* If we didn't find any dynamic relocs in read-only sections, then
1715 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1725 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1726 h->root.root.string);
1730 /* We must allocate the symbol in our .dynbss section, which will
1731 become part of the .bss section of the executable. There will be
1732 an entry for this symbol in the .dynsym section. The dynamic
1733 object will contain position independent code, so all references
1734 from the dynamic object to this symbol will go through the global
1735 offset table. The dynamic linker will use the .dynsym entry to
1736 determine the address it must put in the global offset table, so
1737 both the dynamic object and the regular object will refer to the
1738 same memory location for the variable. */
1740 htab = elf64_x86_64_hash_table (info);
1742 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1743 to copy the initial value out of the dynamic object and into the
1744 runtime process image. */
1745 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1747 htab->srelbss->size += sizeof (Elf64_External_Rela);
1753 return _bfd_elf_adjust_dynamic_copy (h, s);
1756 /* Allocate space in .plt, .got and associated reloc sections for
1760 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1762 struct bfd_link_info *info;
1763 struct elf64_x86_64_link_hash_table *htab;
1764 struct elf64_x86_64_link_hash_entry *eh;
1765 struct elf64_x86_64_dyn_relocs *p;
1767 if (h->root.type == bfd_link_hash_indirect)
1770 if (h->root.type == bfd_link_hash_warning)
1771 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1772 eh = (struct elf64_x86_64_link_hash_entry *) h;
1774 info = (struct bfd_link_info *) inf;
1775 htab = elf64_x86_64_hash_table (info);
1777 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1778 here if it is defined and referenced in a non-shared object. */
1779 if (h->type == STT_GNU_IFUNC
1782 asection *plt, *gotplt, *relplt;
1784 /* Return and discard space for dynamic relocations against it if
1785 it is never referenced in a non-shared object. */
1786 if (!h->ref_regular)
1788 if (h->plt.refcount > 0
1789 || h->got.refcount > 0)
1791 h->got.offset = (bfd_vma) -1;
1792 eh->dyn_relocs = NULL;
1796 if (h->plt.refcount <= 0)
1799 /* When building a static executable, use .iplt, .igot.plt and
1800 .rela.iplt sections for STT_GNU_IFUNC symbols. */
1801 if (htab->splt != 0)
1804 gotplt = htab->sgotplt;
1805 relplt = htab->srelplt;
1807 /* If this is the first .plt entry, make room for the special
1810 plt->size += PLT_ENTRY_SIZE;
1815 gotplt = htab->igotplt;
1816 relplt = htab->irelplt;
1819 /* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
1820 the original value for R_X86_64_IRELATIVE. */
1821 h->plt.offset = plt->size;
1823 /* Make room for this entry in the .plt/.iplt section. */
1824 plt->size += PLT_ENTRY_SIZE;
1826 /* We also need to make an entry in the .got.plt/.got.iplt
1827 section, which will be placed in the .got section by the
1829 gotplt->size += GOT_ENTRY_SIZE;
1831 /* We also need to make an entry in the .rela.plt/.rela.iplt
1833 relplt->size += sizeof (Elf64_External_Rela);
1834 relplt->reloc_count++;
1836 /* No need for dynamic relocation for local STT_GNU_IFUNC symbol.
1837 Discard space for relocations against it. */
1838 if (h->dynindx == -1 || h->forced_local)
1839 eh->dyn_relocs = NULL;
1841 /* STT_GNU_IFUNC symbol uses .got.plt, not .got. But for
1842 shared library, we must go through GOT and we can't
1843 use R_X86_64_IRELATIVE unless it is forced local. */
1844 if (info->executable
1848 if (h->pointer_equality_needed
1849 && htab->sgot != NULL)
1851 /* We can't use .got.plt, which contains the real
1852 function addres, since we need pointer equality.
1853 We will load the GOT entry with the PLT entry
1854 in elf64_x86_64_finish_dynamic_symbol and don't
1855 need GOT relocation. */
1856 h->got.offset = htab->sgot->size;
1857 htab->sgot->size += GOT_ENTRY_SIZE;
1858 eh->tlsdesc_got = (bfd_vma) -1;
1862 h->got.refcount = 0;
1865 else if (htab->elf.dynamic_sections_created
1866 && h->plt.refcount > 0)
1868 /* Make sure this symbol is output as a dynamic symbol.
1869 Undefined weak syms won't yet be marked as dynamic. */
1870 if (h->dynindx == -1
1871 && !h->forced_local)
1873 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1878 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1880 asection *s = htab->splt;
1882 /* If this is the first .plt entry, make room for the special
1885 s->size += PLT_ENTRY_SIZE;
1887 h->plt.offset = s->size;
1889 /* If this symbol is not defined in a regular file, and we are
1890 not generating a shared library, then set the symbol to this
1891 location in the .plt. This is required to make function
1892 pointers compare as equal between the normal executable and
1893 the shared library. */
1897 h->root.u.def.section = s;
1898 h->root.u.def.value = h->plt.offset;
1901 /* Make room for this entry. */
1902 s->size += PLT_ENTRY_SIZE;
1904 /* We also need to make an entry in the .got.plt section, which
1905 will be placed in the .got section by the linker script. */
1906 htab->sgotplt->size += GOT_ENTRY_SIZE;
1908 /* We also need to make an entry in the .rela.plt section. */
1909 htab->srelplt->size += sizeof (Elf64_External_Rela);
1910 htab->srelplt->reloc_count++;
1914 h->plt.offset = (bfd_vma) -1;
1920 h->plt.offset = (bfd_vma) -1;
1924 eh->tlsdesc_got = (bfd_vma) -1;
1926 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1927 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1928 if (h->got.refcount > 0
1931 && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
1933 h->got.offset = (bfd_vma) -1;
1935 else if (h->got.refcount > 0)
1939 int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1941 /* Make sure this symbol is output as a dynamic symbol.
1942 Undefined weak syms won't yet be marked as dynamic. */
1943 if (h->dynindx == -1
1944 && !h->forced_local)
1946 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1950 if (GOT_TLS_GDESC_P (tls_type))
1952 eh->tlsdesc_got = htab->sgotplt->size
1953 - elf64_x86_64_compute_jump_table_size (htab);
1954 htab->sgotplt->size += 2 * GOT_ENTRY_SIZE;
1955 h->got.offset = (bfd_vma) -2;
1957 if (! GOT_TLS_GDESC_P (tls_type)
1958 || GOT_TLS_GD_P (tls_type))
1961 h->got.offset = s->size;
1962 s->size += GOT_ENTRY_SIZE;
1963 if (GOT_TLS_GD_P (tls_type))
1964 s->size += GOT_ENTRY_SIZE;
1966 dyn = htab->elf.dynamic_sections_created;
1967 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1969 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1970 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1971 || tls_type == GOT_TLS_IE)
1972 htab->srelgot->size += sizeof (Elf64_External_Rela);
1973 else if (GOT_TLS_GD_P (tls_type))
1974 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1975 else if (! GOT_TLS_GDESC_P (tls_type)
1976 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1977 || h->root.type != bfd_link_hash_undefweak)
1979 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1980 htab->srelgot->size += sizeof (Elf64_External_Rela);
1981 if (GOT_TLS_GDESC_P (tls_type))
1983 htab->srelplt->size += sizeof (Elf64_External_Rela);
1984 htab->tlsdesc_plt = (bfd_vma) -1;
1988 h->got.offset = (bfd_vma) -1;
1991 if (eh->dyn_relocs == NULL)
1994 /* In the shared -Bsymbolic case, discard space allocated for
1995 dynamic pc-relative relocs against symbols which turn out to be
1996 defined in regular objects. For the normal shared case, discard
1997 space for pc-relative relocs that have become local due to symbol
1998 visibility changes. */
2002 /* Relocs that use pc_count are those that appear on a call
2003 insn, or certain REL relocs that can generated via assembly.
2004 We want calls to protected symbols to resolve directly to the
2005 function rather than going via the plt. If people want
2006 function pointer comparisons to work as expected then they
2007 should avoid writing weird assembly. */
2008 if (SYMBOL_CALLS_LOCAL (info, h))
2010 struct elf64_x86_64_dyn_relocs **pp;
2012 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2014 p->count -= p->pc_count;
2023 /* Also discard relocs on undefined weak syms with non-default
2025 if (eh->dyn_relocs != NULL
2026 && h->root.type == bfd_link_hash_undefweak)
2028 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2029 eh->dyn_relocs = NULL;
2031 /* Make sure undefined weak symbols are output as a dynamic
2033 else if (h->dynindx == -1
2034 && ! h->forced_local
2035 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2040 else if (ELIMINATE_COPY_RELOCS)
2042 /* For the non-shared case, discard space for relocs against
2043 symbols which turn out to need copy relocs or are not
2049 || (htab->elf.dynamic_sections_created
2050 && (h->root.type == bfd_link_hash_undefweak
2051 || h->root.type == bfd_link_hash_undefined))))
2053 /* Make sure this symbol is output as a dynamic symbol.
2054 Undefined weak syms won't yet be marked as dynamic. */
2055 if (h->dynindx == -1
2056 && ! h->forced_local
2057 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2060 /* If that succeeded, we know we'll be keeping all the
2062 if (h->dynindx != -1)
2066 eh->dyn_relocs = NULL;
2071 /* Finally, allocate space. */
2072 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2076 sreloc = elf_section_data (p->sec)->sreloc;
2078 BFD_ASSERT (sreloc != NULL);
2080 sreloc->size += p->count * sizeof (Elf64_External_Rela);
2086 /* Find any dynamic relocs that apply to read-only sections. */
2089 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2091 struct elf64_x86_64_link_hash_entry *eh;
2092 struct elf64_x86_64_dyn_relocs *p;
2094 if (h->root.type == bfd_link_hash_warning)
2095 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2097 eh = (struct elf64_x86_64_link_hash_entry *) h;
2098 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2100 asection *s = p->sec->output_section;
2102 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2104 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2106 info->flags |= DF_TEXTREL;
2108 /* Not an error, just cut short the traversal. */
2115 /* Set the sizes of the dynamic sections. */
2118 elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2119 struct bfd_link_info *info)
2121 struct elf64_x86_64_link_hash_table *htab;
2127 htab = elf64_x86_64_hash_table (info);
2128 dynobj = htab->elf.dynobj;
2132 if (htab->elf.dynamic_sections_created)
2134 /* Set the contents of the .interp section to the interpreter. */
2135 if (info->executable)
2137 s = bfd_get_section_by_name (dynobj, ".interp");
2140 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2141 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2145 /* Set up .got offsets for local syms, and space for local dynamic
2147 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2149 bfd_signed_vma *local_got;
2150 bfd_signed_vma *end_local_got;
2151 char *local_tls_type;
2152 bfd_vma *local_tlsdesc_gotent;
2153 bfd_size_type locsymcount;
2154 Elf_Internal_Shdr *symtab_hdr;
2157 if (! is_x86_64_elf (ibfd))
2160 for (s = ibfd->sections; s != NULL; s = s->next)
2162 struct elf64_x86_64_dyn_relocs *p;
2164 for (p = (struct elf64_x86_64_dyn_relocs *)
2165 (elf_section_data (s)->local_dynrel);
2169 if (!bfd_is_abs_section (p->sec)
2170 && bfd_is_abs_section (p->sec->output_section))
2172 /* Input section has been discarded, either because
2173 it is a copy of a linkonce section or due to
2174 linker script /DISCARD/, so we'll be discarding
2177 else if (p->count != 0)
2179 srel = elf_section_data (p->sec)->sreloc;
2180 srel->size += p->count * sizeof (Elf64_External_Rela);
2181 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2182 info->flags |= DF_TEXTREL;
2187 local_got = elf_local_got_refcounts (ibfd);
2191 symtab_hdr = &elf_symtab_hdr (ibfd);
2192 locsymcount = symtab_hdr->sh_info;
2193 end_local_got = local_got + locsymcount;
2194 local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
2195 local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd);
2197 srel = htab->srelgot;
2198 for (; local_got < end_local_got;
2199 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2201 *local_tlsdesc_gotent = (bfd_vma) -1;
2204 if (GOT_TLS_GDESC_P (*local_tls_type))
2206 *local_tlsdesc_gotent = htab->sgotplt->size
2207 - elf64_x86_64_compute_jump_table_size (htab);
2208 htab->sgotplt->size += 2 * GOT_ENTRY_SIZE;
2209 *local_got = (bfd_vma) -2;
2211 if (! GOT_TLS_GDESC_P (*local_tls_type)
2212 || GOT_TLS_GD_P (*local_tls_type))
2214 *local_got = s->size;
2215 s->size += GOT_ENTRY_SIZE;
2216 if (GOT_TLS_GD_P (*local_tls_type))
2217 s->size += GOT_ENTRY_SIZE;
2220 || GOT_TLS_GD_ANY_P (*local_tls_type)
2221 || *local_tls_type == GOT_TLS_IE)
2223 if (GOT_TLS_GDESC_P (*local_tls_type))
2225 htab->srelplt->size += sizeof (Elf64_External_Rela);
2226 htab->tlsdesc_plt = (bfd_vma) -1;
2228 if (! GOT_TLS_GDESC_P (*local_tls_type)
2229 || GOT_TLS_GD_P (*local_tls_type))
2230 srel->size += sizeof (Elf64_External_Rela);
2234 *local_got = (bfd_vma) -1;
2238 if (htab->tls_ld_got.refcount > 0)
2240 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2242 htab->tls_ld_got.offset = htab->sgot->size;
2243 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2244 htab->srelgot->size += sizeof (Elf64_External_Rela);
2247 htab->tls_ld_got.offset = -1;
2249 /* Allocate global sym .plt and .got entries, and space for global
2250 sym dynamic relocs. */
2251 elf_link_hash_traverse (&htab->elf, elf64_x86_64_allocate_dynrelocs,
2254 /* For every jump slot reserved in the sgotplt, reloc_count is
2255 incremented. However, when we reserve space for TLS descriptors,
2256 it's not incremented, so in order to compute the space reserved
2257 for them, it suffices to multiply the reloc count by the jump
2260 htab->sgotplt_jump_table_size
2261 = elf64_x86_64_compute_jump_table_size (htab);
2263 if (htab->tlsdesc_plt)
2265 /* If we're not using lazy TLS relocations, don't generate the
2266 PLT and GOT entries they require. */
2267 if ((info->flags & DF_BIND_NOW))
2268 htab->tlsdesc_plt = 0;
2271 htab->tlsdesc_got = htab->sgot->size;
2272 htab->sgot->size += GOT_ENTRY_SIZE;
2273 /* Reserve room for the initial entry.
2274 FIXME: we could probably do away with it in this case. */
2275 if (htab->splt->size == 0)
2276 htab->splt->size += PLT_ENTRY_SIZE;
2277 htab->tlsdesc_plt = htab->splt->size;
2278 htab->splt->size += PLT_ENTRY_SIZE;
2282 /* We now have determined the sizes of the various dynamic sections.
2283 Allocate memory for them. */
2285 for (s = dynobj->sections; s != NULL; s = s->next)
2287 if ((s->flags & SEC_LINKER_CREATED) == 0)
2292 || s == htab->sgotplt
2294 || s == htab->igotplt
2295 || s == htab->sdynbss)
2297 /* Strip this section if we don't need it; see the
2300 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2302 if (s->size != 0 && s != htab->srelplt)
2305 /* We use the reloc_count field as a counter if we need
2306 to copy relocs into the output file. */
2307 if (s != htab->srelplt)
2312 /* It's not one of our sections, so don't allocate space. */
2318 /* If we don't need this section, strip it from the
2319 output file. This is mostly to handle .rela.bss and
2320 .rela.plt. We must create both sections in
2321 create_dynamic_sections, because they must be created
2322 before the linker maps input sections to output
2323 sections. The linker does that before
2324 adjust_dynamic_symbol is called, and it is that
2325 function which decides whether anything needs to go
2326 into these sections. */
2328 s->flags |= SEC_EXCLUDE;
2332 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2335 /* Allocate memory for the section contents. We use bfd_zalloc
2336 here in case unused entries are not reclaimed before the
2337 section's contents are written out. This should not happen,
2338 but this way if it does, we get a R_X86_64_NONE reloc instead
2340 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2341 if (s->contents == NULL)
2345 if (htab->elf.dynamic_sections_created)
2347 /* Add some entries to the .dynamic section. We fill in the
2348 values later, in elf64_x86_64_finish_dynamic_sections, but we
2349 must add the entries now so that we get the correct size for
2350 the .dynamic section. The DT_DEBUG entry is filled in by the
2351 dynamic linker and used by the debugger. */
2352 #define add_dynamic_entry(TAG, VAL) \
2353 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2355 if (info->executable)
2357 if (!add_dynamic_entry (DT_DEBUG, 0))
2361 if (htab->splt->size != 0)
2363 if (!add_dynamic_entry (DT_PLTGOT, 0)
2364 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2365 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2366 || !add_dynamic_entry (DT_JMPREL, 0))
2369 if (htab->tlsdesc_plt
2370 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2371 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2377 if (!add_dynamic_entry (DT_RELA, 0)
2378 || !add_dynamic_entry (DT_RELASZ, 0)
2379 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2382 /* If any dynamic relocs apply to a read-only section,
2383 then we need a DT_TEXTREL entry. */
2384 if ((info->flags & DF_TEXTREL) == 0)
2385 elf_link_hash_traverse (&htab->elf,
2386 elf64_x86_64_readonly_dynrelocs,
2389 if ((info->flags & DF_TEXTREL) != 0)
2391 if (!add_dynamic_entry (DT_TEXTREL, 0))
2396 #undef add_dynamic_entry
2402 elf64_x86_64_always_size_sections (bfd *output_bfd,
2403 struct bfd_link_info *info)
2405 asection *tls_sec = elf_hash_table (info)->tls_sec;
2409 struct elf_link_hash_entry *tlsbase;
2411 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2412 "_TLS_MODULE_BASE_",
2413 FALSE, FALSE, FALSE);
2415 if (tlsbase && tlsbase->type == STT_TLS)
2417 struct bfd_link_hash_entry *bh = NULL;
2418 const struct elf_backend_data *bed
2419 = get_elf_backend_data (output_bfd);
2421 if (!(_bfd_generic_link_add_one_symbol
2422 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2423 tls_sec, 0, NULL, FALSE,
2424 bed->collect, &bh)))
2427 elf64_x86_64_hash_table (info)->tls_module_base = bh;
2429 tlsbase = (struct elf_link_hash_entry *)bh;
2430 tlsbase->def_regular = 1;
2431 tlsbase->other = STV_HIDDEN;
2432 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2439 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2440 executables. Rather than setting it to the beginning of the TLS
2441 section, we have to set it to the end. This function may be called
2442 multiple times, it is idempotent. */
2445 elf64_x86_64_set_tls_module_base (struct bfd_link_info *info)
2447 struct bfd_link_hash_entry *base;
2449 if (!info->executable)
2452 base = elf64_x86_64_hash_table (info)->tls_module_base;
2457 base->u.def.value = elf_hash_table (info)->tls_size;
2460 /* Return the base VMA address which should be subtracted from real addresses
2461 when resolving @dtpoff relocation.
2462 This is PT_TLS segment p_vaddr. */
2465 elf64_x86_64_dtpoff_base (struct bfd_link_info *info)
2467 /* If tls_sec is NULL, we should have signalled an error already. */
2468 if (elf_hash_table (info)->tls_sec == NULL)
2470 return elf_hash_table (info)->tls_sec->vma;
2473 /* Return the relocation value for @tpoff relocation
2474 if STT_TLS virtual address is ADDRESS. */
2477 elf64_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2479 struct elf_link_hash_table *htab = elf_hash_table (info);
2481 /* If tls_segment is NULL, we should have signalled an error already. */
2482 if (htab->tls_sec == NULL)
2484 return address - htab->tls_size - htab->tls_sec->vma;
2487 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2491 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2493 /* Opcode Instruction
2496 0x0f 0x8x conditional jump */
2498 && (contents [offset - 1] == 0xe8
2499 || contents [offset - 1] == 0xe9))
2501 && contents [offset - 2] == 0x0f
2502 && (contents [offset - 1] & 0xf0) == 0x80));
2505 /* Relocate an x86_64 ELF section. */
2508 elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
2509 bfd *input_bfd, asection *input_section,
2510 bfd_byte *contents, Elf_Internal_Rela *relocs,
2511 Elf_Internal_Sym *local_syms,
2512 asection **local_sections)
2514 struct elf64_x86_64_link_hash_table *htab;
2515 Elf_Internal_Shdr *symtab_hdr;
2516 struct elf_link_hash_entry **sym_hashes;
2517 bfd_vma *local_got_offsets;
2518 bfd_vma *local_tlsdesc_gotents;
2519 Elf_Internal_Rela *rel;
2520 Elf_Internal_Rela *relend;
2522 BFD_ASSERT (is_x86_64_elf (input_bfd));
2524 htab = elf64_x86_64_hash_table (info);
2525 symtab_hdr = &elf_symtab_hdr (input_bfd);
2526 sym_hashes = elf_sym_hashes (input_bfd);
2527 local_got_offsets = elf_local_got_offsets (input_bfd);
2528 local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
2530 elf64_x86_64_set_tls_module_base (info);
2533 relend = relocs + input_section->reloc_count;
2534 for (; rel < relend; rel++)
2536 unsigned int r_type;
2537 reloc_howto_type *howto;
2538 unsigned long r_symndx;
2539 struct elf_link_hash_entry *h;
2540 Elf_Internal_Sym *sym;
2542 bfd_vma off, offplt;
2544 bfd_boolean unresolved_reloc;
2545 bfd_reloc_status_type r;
2549 r_type = ELF64_R_TYPE (rel->r_info);
2550 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2551 || r_type == (int) R_X86_64_GNU_VTENTRY)
2554 if (r_type >= R_X86_64_max)
2556 bfd_set_error (bfd_error_bad_value);
2560 howto = x86_64_elf_howto_table + r_type;
2561 r_symndx = ELF64_R_SYM (rel->r_info);
2565 unresolved_reloc = FALSE;
2566 if (r_symndx < symtab_hdr->sh_info)
2568 sym = local_syms + r_symndx;
2569 sec = local_sections[r_symndx];
2571 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2577 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2578 r_symndx, symtab_hdr, sym_hashes,
2580 unresolved_reloc, warned);
2583 if (sec != NULL && elf_discarded_section (sec))
2585 /* For relocs against symbols from removed linkonce sections,
2586 or sections discarded by a linker script, we just want the
2587 section contents zeroed. Avoid any special processing. */
2588 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2594 if (info->relocatable)
2597 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2598 it here if it is defined in a non-shared object. */
2600 && h->type == STT_GNU_IFUNC
2606 if ((input_section->flags & SEC_ALLOC) == 0
2607 || h->plt.offset == (bfd_vma) -1)
2610 /* STT_GNU_IFUNC symbol must go through PLT. */
2611 plt = htab->splt ? htab->splt : htab->iplt;
2612 relocation = (plt->output_section->vma
2613 + plt->output_offset + h->plt.offset);
2618 (*_bfd_error_handler)
2619 (_("%B: relocation %s against STT_GNU_IFUNC "
2620 "symbol `%s' isn't handled by %s"), input_bfd,
2621 x86_64_elf_howto_table[r_type].name,
2622 h->root.root.string, __FUNCTION__);
2623 bfd_set_error (bfd_error_bad_value);
2627 if (!info->executable)
2634 case R_X86_64_PLT32:
2637 case R_X86_64_GOTPCREL:
2638 case R_X86_64_GOTPCREL64:
2639 base_got = htab->sgot;
2640 off = h->got.offset;
2642 if (base_got == NULL)
2645 if (off == (bfd_vma) -1)
2647 /* We can't use h->got.offset here to save state, or
2648 even just remember the offset, as finish_dynamic_symbol
2649 would use that as offset into .got. */
2651 if (htab->splt != NULL)
2653 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2654 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2655 base_got = htab->sgotplt;
2659 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2660 off = plt_index * GOT_ENTRY_SIZE;
2661 base_got = htab->igotplt;
2664 if (h->dynindx == -1
2668 /* This references the local defitionion. We must
2669 initialize this entry in the global offset table.
2670 Since the offset must always be a multiple of 8,
2671 we use the least significant bit to record
2672 whether we have initialized it already.
2674 When doing a dynamic link, we create a .rela.got
2675 relocation entry to initialize the value. This
2676 is done in the finish_dynamic_symbol routine. */
2681 bfd_put_64 (output_bfd, relocation,
2682 base_got->contents + off);
2683 /* Note that this is harmless for the GOTPLT64
2684 case, as -1 | 1 still is -1. */
2690 relocation = (base_got->output_section->vma
2691 + base_got->output_offset + off);
2693 if (r_type != R_X86_64_GOTPCREL
2694 && r_type != R_X86_64_GOTPCREL64)
2697 if (htab->splt != NULL)
2698 gotplt = htab->sgotplt;
2700 gotplt = htab->igotplt;
2701 relocation -= (gotplt->output_section->vma
2702 - gotplt->output_offset);
2709 /* When generating a shared object, the relocations handled here are
2710 copied into the output file to be resolved at run time. */
2713 case R_X86_64_GOT32:
2714 case R_X86_64_GOT64:
2715 /* Relocation is to the entry for this symbol in the global
2717 case R_X86_64_GOTPCREL:
2718 case R_X86_64_GOTPCREL64:
2719 /* Use global offset table entry as symbol value. */
2720 case R_X86_64_GOTPLT64:
2721 /* This is the same as GOT64 for relocation purposes, but
2722 indicates the existence of a PLT entry. The difficulty is,
2723 that we must calculate the GOT slot offset from the PLT
2724 offset, if this symbol got a PLT entry (it was global).
2725 Additionally if it's computed from the PLT entry, then that
2726 GOT offset is relative to .got.plt, not to .got. */
2727 base_got = htab->sgot;
2729 if (htab->sgot == NULL)
2736 off = h->got.offset;
2738 && h->plt.offset != (bfd_vma)-1
2739 && off == (bfd_vma)-1)
2741 /* We can't use h->got.offset here to save
2742 state, or even just remember the offset, as
2743 finish_dynamic_symbol would use that as offset into
2745 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2746 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2747 base_got = htab->sgotplt;
2750 dyn = htab->elf.dynamic_sections_created;
2752 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2754 && SYMBOL_REFERENCES_LOCAL (info, h))
2755 || (ELF_ST_VISIBILITY (h->other)
2756 && h->root.type == bfd_link_hash_undefweak))
2758 /* This is actually a static link, or it is a -Bsymbolic
2759 link and the symbol is defined locally, or the symbol
2760 was forced to be local because of a version file. We
2761 must initialize this entry in the global offset table.
2762 Since the offset must always be a multiple of 8, we
2763 use the least significant bit to record whether we
2764 have initialized it already.
2766 When doing a dynamic link, we create a .rela.got
2767 relocation entry to initialize the value. This is
2768 done in the finish_dynamic_symbol routine. */
2773 bfd_put_64 (output_bfd, relocation,
2774 base_got->contents + off);
2775 /* Note that this is harmless for the GOTPLT64 case,
2776 as -1 | 1 still is -1. */
2781 unresolved_reloc = FALSE;
2785 if (local_got_offsets == NULL)
2788 off = local_got_offsets[r_symndx];
2790 /* The offset must always be a multiple of 8. We use
2791 the least significant bit to record whether we have
2792 already generated the necessary reloc. */
2797 bfd_put_64 (output_bfd, relocation,
2798 base_got->contents + off);
2803 Elf_Internal_Rela outrel;
2806 /* We need to generate a R_X86_64_RELATIVE reloc
2807 for the dynamic linker. */
2812 outrel.r_offset = (base_got->output_section->vma
2813 + base_got->output_offset
2815 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2816 outrel.r_addend = relocation;
2818 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2819 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2822 local_got_offsets[r_symndx] |= 1;
2826 if (off >= (bfd_vma) -2)
2829 relocation = base_got->output_section->vma
2830 + base_got->output_offset + off;
2831 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
2832 relocation -= htab->sgotplt->output_section->vma
2833 - htab->sgotplt->output_offset;
2837 case R_X86_64_GOTOFF64:
2838 /* Relocation is relative to the start of the global offset
2841 /* Check to make sure it isn't a protected function symbol
2842 for shared library since it may not be local when used
2843 as function address. */
2847 && h->type == STT_FUNC
2848 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2850 (*_bfd_error_handler)
2851 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
2852 input_bfd, h->root.root.string);
2853 bfd_set_error (bfd_error_bad_value);
2857 /* Note that sgot is not involved in this
2858 calculation. We always want the start of .got.plt. If we
2859 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2860 permitted by the ABI, we might have to change this
2862 relocation -= htab->sgotplt->output_section->vma
2863 + htab->sgotplt->output_offset;
2866 case R_X86_64_GOTPC32:
2867 case R_X86_64_GOTPC64:
2868 /* Use global offset table as symbol value. */
2869 relocation = htab->sgotplt->output_section->vma
2870 + htab->sgotplt->output_offset;
2871 unresolved_reloc = FALSE;
2874 case R_X86_64_PLTOFF64:
2875 /* Relocation is PLT entry relative to GOT. For local
2876 symbols it's the symbol itself relative to GOT. */
2878 /* See PLT32 handling. */
2879 && h->plt.offset != (bfd_vma) -1
2880 && htab->splt != NULL)
2882 relocation = (htab->splt->output_section->vma
2883 + htab->splt->output_offset
2885 unresolved_reloc = FALSE;
2888 relocation -= htab->sgotplt->output_section->vma
2889 + htab->sgotplt->output_offset;
2892 case R_X86_64_PLT32:
2893 /* Relocation is to the entry for this symbol in the
2894 procedure linkage table. */
2896 /* Resolve a PLT32 reloc against a local symbol directly,
2897 without using the procedure linkage table. */
2901 if (h->plt.offset == (bfd_vma) -1
2902 || htab->splt == NULL)
2904 /* We didn't make a PLT entry for this symbol. This
2905 happens when statically linking PIC code, or when
2906 using -Bsymbolic. */
2910 relocation = (htab->splt->output_section->vma
2911 + htab->splt->output_offset
2913 unresolved_reloc = FALSE;
2920 && (input_section->flags & SEC_ALLOC) != 0
2921 && (input_section->flags & SEC_READONLY) != 0
2924 bfd_boolean fail = FALSE;
2926 = (r_type == R_X86_64_PC32
2927 && is_32bit_relative_branch (contents, rel->r_offset));
2929 if (SYMBOL_REFERENCES_LOCAL (info, h))
2931 /* Symbol is referenced locally. Make sure it is
2932 defined locally or for a branch. */
2933 fail = !h->def_regular && !branch;
2937 /* Symbol isn't referenced locally. We only allow
2938 branch to symbol with non-default visibility. */
2940 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
2947 const char *pic = "";
2949 switch (ELF_ST_VISIBILITY (h->other))
2952 v = _("hidden symbol");
2955 v = _("internal symbol");
2958 v = _("protected symbol");
2962 pic = _("; recompile with -fPIC");
2967 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
2969 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
2971 (*_bfd_error_handler) (fmt, input_bfd,
2972 x86_64_elf_howto_table[r_type].name,
2973 v, h->root.root.string, pic);
2974 bfd_set_error (bfd_error_bad_value);
2985 /* FIXME: The ABI says the linker should make sure the value is
2986 the same when it's zeroextended to 64 bit. */
2988 if ((input_section->flags & SEC_ALLOC) == 0)
2993 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2994 || h->root.type != bfd_link_hash_undefweak)
2995 && (! IS_X86_64_PCREL_TYPE (r_type)
2996 || ! SYMBOL_CALLS_LOCAL (info, h)))
2997 || (ELIMINATE_COPY_RELOCS
3004 || h->root.type == bfd_link_hash_undefweak
3005 || h->root.type == bfd_link_hash_undefined)))
3007 Elf_Internal_Rela outrel;
3009 bfd_boolean skip, relocate;
3012 /* When generating a shared object, these relocations
3013 are copied into the output file to be resolved at run
3019 _bfd_elf_section_offset (output_bfd, info, input_section,
3021 if (outrel.r_offset == (bfd_vma) -1)
3023 else if (outrel.r_offset == (bfd_vma) -2)
3024 skip = TRUE, relocate = TRUE;
3026 outrel.r_offset += (input_section->output_section->vma
3027 + input_section->output_offset);
3030 memset (&outrel, 0, sizeof outrel);
3032 /* h->dynindx may be -1 if this symbol was marked to
3036 && (IS_X86_64_PCREL_TYPE (r_type)
3038 || ! SYMBOLIC_BIND (info, h)
3039 || ! h->def_regular))
3041 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
3042 outrel.r_addend = rel->r_addend;
3046 /* This symbol is local, or marked to become local. */
3047 if (r_type == R_X86_64_64)
3050 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3051 outrel.r_addend = relocation + rel->r_addend;
3057 if (bfd_is_abs_section (sec))
3059 else if (sec == NULL || sec->owner == NULL)
3061 bfd_set_error (bfd_error_bad_value);
3068 /* We are turning this relocation into one
3069 against a section symbol. It would be
3070 proper to subtract the symbol's value,
3071 osec->vma, from the emitted reloc addend,
3072 but ld.so expects buggy relocs. */
3073 osec = sec->output_section;
3074 sindx = elf_section_data (osec)->dynindx;
3077 asection *oi = htab->elf.text_index_section;
3078 sindx = elf_section_data (oi)->dynindx;
3080 BFD_ASSERT (sindx != 0);
3083 outrel.r_info = ELF64_R_INFO (sindx, r_type);
3084 outrel.r_addend = relocation + rel->r_addend;
3088 sreloc = elf_section_data (input_section)->sreloc;
3090 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3092 loc = sreloc->contents;
3093 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3094 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3096 /* If this reloc is against an external symbol, we do
3097 not want to fiddle with the addend. Otherwise, we
3098 need to include the symbol value so that it becomes
3099 an addend for the dynamic reloc. */
3106 case R_X86_64_TLSGD:
3107 case R_X86_64_GOTPC32_TLSDESC:
3108 case R_X86_64_TLSDESC_CALL:
3109 case R_X86_64_GOTTPOFF:
3110 tls_type = GOT_UNKNOWN;
3111 if (h == NULL && local_got_offsets)
3112 tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3114 tls_type = elf64_x86_64_hash_entry (h)->tls_type;
3116 if (! elf64_x86_64_tls_transition (info, input_bfd,
3117 input_section, contents,
3118 symtab_hdr, sym_hashes,
3119 &r_type, tls_type, rel,
3123 if (r_type == R_X86_64_TPOFF32)
3125 bfd_vma roff = rel->r_offset;
3127 BFD_ASSERT (! unresolved_reloc);
3129 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3131 /* GD->LE transition.
3132 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3133 .word 0x6666; rex64; call __tls_get_addr
3136 leaq foo@tpoff(%rax), %rax */
3137 memcpy (contents + roff - 4,
3138 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3140 bfd_put_32 (output_bfd,
3141 elf64_x86_64_tpoff (info, relocation),
3142 contents + roff + 8);
3143 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3147 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3149 /* GDesc -> LE transition.
3150 It's originally something like:
3151 leaq x@tlsdesc(%rip), %rax
3157 unsigned int val, type, type2;
3159 type = bfd_get_8 (input_bfd, contents + roff - 3);
3160 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
3161 val = bfd_get_8 (input_bfd, contents + roff - 1);
3162 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3163 contents + roff - 3);
3164 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3165 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3166 contents + roff - 1);
3167 bfd_put_32 (output_bfd,
3168 elf64_x86_64_tpoff (info, relocation),
3172 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3174 /* GDesc -> LE transition.
3179 bfd_put_8 (output_bfd, 0x66, contents + roff);
3180 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3183 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3185 /* IE->LE transition:
3186 Originally it can be one of:
3187 movq foo@gottpoff(%rip), %reg
3188 addq foo@gottpoff(%rip), %reg
3191 leaq foo(%reg), %reg
3194 unsigned int val, type, reg;
3196 val = bfd_get_8 (input_bfd, contents + roff - 3);
3197 type = bfd_get_8 (input_bfd, contents + roff - 2);
3198 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3204 bfd_put_8 (output_bfd, 0x49,
3205 contents + roff - 3);
3206 bfd_put_8 (output_bfd, 0xc7,
3207 contents + roff - 2);
3208 bfd_put_8 (output_bfd, 0xc0 | reg,
3209 contents + roff - 1);
3213 /* addq -> addq - addressing with %rsp/%r12 is
3216 bfd_put_8 (output_bfd, 0x49,
3217 contents + roff - 3);
3218 bfd_put_8 (output_bfd, 0x81,
3219 contents + roff - 2);
3220 bfd_put_8 (output_bfd, 0xc0 | reg,
3221 contents + roff - 1);
3227 bfd_put_8 (output_bfd, 0x4d,
3228 contents + roff - 3);
3229 bfd_put_8 (output_bfd, 0x8d,
3230 contents + roff - 2);
3231 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3232 contents + roff - 1);
3234 bfd_put_32 (output_bfd,
3235 elf64_x86_64_tpoff (info, relocation),
3243 if (htab->sgot == NULL)
3248 off = h->got.offset;
3249 offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got;
3253 if (local_got_offsets == NULL)
3256 off = local_got_offsets[r_symndx];
3257 offplt = local_tlsdesc_gotents[r_symndx];
3264 Elf_Internal_Rela outrel;
3269 if (htab->srelgot == NULL)
3272 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3274 if (GOT_TLS_GDESC_P (tls_type))
3276 outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC);
3277 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3278 + 2 * GOT_ENTRY_SIZE <= htab->sgotplt->size);
3279 outrel.r_offset = (htab->sgotplt->output_section->vma
3280 + htab->sgotplt->output_offset
3282 + htab->sgotplt_jump_table_size);
3283 sreloc = htab->srelplt;
3284 loc = sreloc->contents;
3285 loc += sreloc->reloc_count++
3286 * sizeof (Elf64_External_Rela);
3287 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3288 <= sreloc->contents + sreloc->size);
3290 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3292 outrel.r_addend = 0;
3293 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3296 sreloc = htab->srelgot;
3298 outrel.r_offset = (htab->sgot->output_section->vma
3299 + htab->sgot->output_offset + off);
3301 if (GOT_TLS_GD_P (tls_type))
3302 dr_type = R_X86_64_DTPMOD64;
3303 else if (GOT_TLS_GDESC_P (tls_type))
3306 dr_type = R_X86_64_TPOFF64;
3308 bfd_put_64 (output_bfd, 0, htab->sgot->contents + off);
3309 outrel.r_addend = 0;
3310 if ((dr_type == R_X86_64_TPOFF64
3311 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3312 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3313 outrel.r_info = ELF64_R_INFO (indx, dr_type);
3315 loc = sreloc->contents;
3316 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3317 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3318 <= sreloc->contents + sreloc->size);
3319 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3321 if (GOT_TLS_GD_P (tls_type))
3325 BFD_ASSERT (! unresolved_reloc);
3326 bfd_put_64 (output_bfd,
3327 relocation - elf64_x86_64_dtpoff_base (info),
3328 htab->sgot->contents + off + GOT_ENTRY_SIZE);
3332 bfd_put_64 (output_bfd, 0,
3333 htab->sgot->contents + off + GOT_ENTRY_SIZE);
3334 outrel.r_info = ELF64_R_INFO (indx,
3336 outrel.r_offset += GOT_ENTRY_SIZE;
3337 sreloc->reloc_count++;
3338 loc += sizeof (Elf64_External_Rela);
3339 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3340 <= sreloc->contents + sreloc->size);
3341 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3349 local_got_offsets[r_symndx] |= 1;
3352 if (off >= (bfd_vma) -2
3353 && ! GOT_TLS_GDESC_P (tls_type))
3355 if (r_type == ELF64_R_TYPE (rel->r_info))
3357 if (r_type == R_X86_64_GOTPC32_TLSDESC
3358 || r_type == R_X86_64_TLSDESC_CALL)
3359 relocation = htab->sgotplt->output_section->vma
3360 + htab->sgotplt->output_offset
3361 + offplt + htab->sgotplt_jump_table_size;
3363 relocation = htab->sgot->output_section->vma
3364 + htab->sgot->output_offset + off;
3365 unresolved_reloc = FALSE;
3369 bfd_vma roff = rel->r_offset;
3371 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3373 /* GD->IE transition.
3374 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3375 .word 0x6666; rex64; call __tls_get_addr@plt
3378 addq foo@gottpoff(%rip), %rax */
3379 memcpy (contents + roff - 4,
3380 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3383 relocation = (htab->sgot->output_section->vma
3384 + htab->sgot->output_offset + off
3386 - input_section->output_section->vma
3387 - input_section->output_offset
3389 bfd_put_32 (output_bfd, relocation,
3390 contents + roff + 8);
3391 /* Skip R_X86_64_PLT32. */
3395 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3397 /* GDesc -> IE transition.
3398 It's originally something like:
3399 leaq x@tlsdesc(%rip), %rax
3402 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3405 unsigned int val, type, type2;
3407 type = bfd_get_8 (input_bfd, contents + roff - 3);
3408 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
3409 val = bfd_get_8 (input_bfd, contents + roff - 1);
3411 /* Now modify the instruction as appropriate. To
3412 turn a leaq into a movq in the form we use it, it
3413 suffices to change the second byte from 0x8d to
3415 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3417 bfd_put_32 (output_bfd,
3418 htab->sgot->output_section->vma
3419 + htab->sgot->output_offset + off
3421 - input_section->output_section->vma
3422 - input_section->output_offset
3427 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3429 /* GDesc -> IE transition.
3436 unsigned int val, type;
3438 type = bfd_get_8 (input_bfd, contents + roff);
3439 val = bfd_get_8 (input_bfd, contents + roff + 1);
3440 bfd_put_8 (output_bfd, 0x66, contents + roff);
3441 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3449 case R_X86_64_TLSLD:
3450 if (! elf64_x86_64_tls_transition (info, input_bfd,
3451 input_section, contents,
3452 symtab_hdr, sym_hashes,
3453 &r_type, GOT_UNKNOWN,
3457 if (r_type != R_X86_64_TLSLD)
3459 /* LD->LE transition:
3460 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3462 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3464 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3465 memcpy (contents + rel->r_offset - 3,
3466 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3467 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3472 if (htab->sgot == NULL)
3475 off = htab->tls_ld_got.offset;
3480 Elf_Internal_Rela outrel;
3483 if (htab->srelgot == NULL)
3486 outrel.r_offset = (htab->sgot->output_section->vma
3487 + htab->sgot->output_offset + off);
3489 bfd_put_64 (output_bfd, 0,
3490 htab->sgot->contents + off);
3491 bfd_put_64 (output_bfd, 0,
3492 htab->sgot->contents + off + GOT_ENTRY_SIZE);
3493 outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
3494 outrel.r_addend = 0;
3495 loc = htab->srelgot->contents;
3496 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3497 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3498 htab->tls_ld_got.offset |= 1;
3500 relocation = htab->sgot->output_section->vma
3501 + htab->sgot->output_offset + off;
3502 unresolved_reloc = FALSE;
3505 case R_X86_64_DTPOFF32:
3506 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3507 relocation -= elf64_x86_64_dtpoff_base (info);
3509 relocation = elf64_x86_64_tpoff (info, relocation);
3512 case R_X86_64_TPOFF32:
3513 BFD_ASSERT (! info->shared);
3514 relocation = elf64_x86_64_tpoff (info, relocation);
3521 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3522 because such sections are not SEC_ALLOC and thus ld.so will
3523 not process them. */
3524 if (unresolved_reloc
3525 && !((input_section->flags & SEC_DEBUGGING) != 0
3527 (*_bfd_error_handler)
3528 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3531 (long) rel->r_offset,
3533 h->root.root.string);
3536 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3537 contents, rel->r_offset,
3538 relocation, rel->r_addend);
3540 if (r != bfd_reloc_ok)
3545 name = h->root.root.string;
3548 name = bfd_elf_string_from_elf_section (input_bfd,
3549 symtab_hdr->sh_link,
3554 name = bfd_section_name (input_bfd, sec);
3557 if (r == bfd_reloc_overflow)
3559 if (! ((*info->callbacks->reloc_overflow)
3560 (info, (h ? &h->root : NULL), name, howto->name,
3561 (bfd_vma) 0, input_bfd, input_section,
3567 (*_bfd_error_handler)
3568 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3569 input_bfd, input_section,
3570 (long) rel->r_offset, name, (int) r);
3579 /* Finish up dynamic symbol handling. We set the contents of various
3580 dynamic sections here. */
3583 elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3584 struct bfd_link_info *info,
3585 struct elf_link_hash_entry *h,
3586 Elf_Internal_Sym *sym)
3588 struct elf64_x86_64_link_hash_table *htab;
3590 htab = elf64_x86_64_hash_table (info);
3592 if (h->plt.offset != (bfd_vma) -1)
3596 Elf_Internal_Rela rela;
3598 asection *plt, *gotplt, *relplt;
3600 /* When building a static executable, use .iplt, .igot.plt and
3601 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3602 if (htab->splt != 0)
3605 gotplt = htab->sgotplt;
3606 relplt = htab->srelplt;
3611 gotplt = htab->igotplt;
3612 relplt = htab->irelplt;
3615 /* This symbol has an entry in the procedure linkage table. Set
3617 if ((h->dynindx == -1
3618 && !((h->forced_local || info->executable)
3620 && h->type == STT_GNU_IFUNC))
3626 /* Get the index in the procedure linkage table which
3627 corresponds to this symbol. This is the index of this symbol
3628 in all the symbols for which we are making plt entries. The
3629 first entry in the procedure linkage table is reserved.
3631 Get the offset into the .got table of the entry that
3632 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3633 bytes. The first three are reserved for the dynamic linker.
3635 For static executables, we don't reserve anything. */
3637 if (plt == htab->splt)
3639 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3640 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3644 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3645 got_offset = plt_index * GOT_ENTRY_SIZE;
3648 /* Fill in the entry in the procedure linkage table. */
3649 memcpy (plt->contents + h->plt.offset, elf64_x86_64_plt_entry,
3652 /* Insert the relocation positions of the plt section. The magic
3653 numbers at the end of the statements are the positions of the
3654 relocations in the plt section. */
3655 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3656 instruction uses 6 bytes, subtract this value. */
3657 bfd_put_32 (output_bfd,
3658 (gotplt->output_section->vma
3659 + gotplt->output_offset
3661 - plt->output_section->vma
3662 - plt->output_offset
3665 plt->contents + h->plt.offset + 2);
3667 /* Don't fill PLT entry for static executables. */
3668 if (plt == htab->splt)
3670 /* Put relocation index. */
3671 bfd_put_32 (output_bfd, plt_index,
3672 plt->contents + h->plt.offset + 7);
3673 /* Put offset for jmp .PLT0. */
3674 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3675 plt->contents + h->plt.offset + 12);
3678 /* Fill in the entry in the global offset table, initially this
3679 points to the pushq instruction in the PLT which is at offset 6. */
3680 bfd_put_64 (output_bfd, (plt->output_section->vma
3681 + plt->output_offset
3682 + h->plt.offset + 6),
3683 gotplt->contents + got_offset);
3685 /* Fill in the entry in the .rela.plt section. */
3686 rela.r_offset = (gotplt->output_section->vma
3687 + gotplt->output_offset
3689 if (h->dynindx == -1
3690 || ((info->executable
3691 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3693 && h->type == STT_GNU_IFUNC))
3695 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3696 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3697 rela.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
3698 rela.r_addend = (h->root.u.def.value
3699 + h->root.u.def.section->output_section->vma
3700 + h->root.u.def.section->output_offset);
3704 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
3707 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3708 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3710 if (!h->def_regular)
3712 /* Mark the symbol as undefined, rather than as defined in
3713 the .plt section. Leave the value if there were any
3714 relocations where pointer equality matters (this is a clue
3715 for the dynamic linker, to make function pointer
3716 comparisons work between an application and shared
3717 library), otherwise set it to zero. If a function is only
3718 called from a binary, there is no need to slow down
3719 shared libraries because of that. */
3720 sym->st_shndx = SHN_UNDEF;
3721 if (!h->pointer_equality_needed)
3726 if (h->got.offset != (bfd_vma) -1
3727 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type)
3728 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
3730 Elf_Internal_Rela rela;
3733 /* This symbol has an entry in the global offset table. Set it
3735 if (htab->sgot == NULL || htab->srelgot == NULL)
3738 rela.r_offset = (htab->sgot->output_section->vma
3739 + htab->sgot->output_offset
3740 + (h->got.offset &~ (bfd_vma) 1));
3742 /* If this is a static link, or it is a -Bsymbolic link and the
3743 symbol is defined locally or was forced to be local because
3744 of a version file, we just want to emit a RELATIVE reloc.
3745 The entry in the global offset table will already have been
3746 initialized in the relocate_section function. */
3747 if ((info->executable
3751 && h->pointer_equality_needed
3752 && h->type == STT_GNU_IFUNC)
3754 /* The STT_GNU_IFUNC symbol is locally defined. But we can't
3755 use .got.plt, which contains the real function addres,
3756 since we need pointer equality. We load the GOT entry
3757 with the PLT entry without relocation. */
3758 asection *plt = htab->splt ? htab->splt : htab->iplt;
3759 if (htab->sgot == NULL
3760 || h->plt.offset == (bfd_vma) -1)
3762 bfd_put_64 (output_bfd, (plt->output_section->vma
3763 + plt->output_offset + h->plt.offset),
3764 htab->sgot->contents + h->got.offset);
3767 else if (info->shared
3768 && SYMBOL_REFERENCES_LOCAL (info, h))
3770 if (!h->def_regular)
3772 BFD_ASSERT((h->got.offset & 1) != 0);
3773 rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3774 rela.r_addend = (h->root.u.def.value
3775 + h->root.u.def.section->output_section->vma
3776 + h->root.u.def.section->output_offset);
3780 BFD_ASSERT((h->got.offset & 1) == 0);
3781 bfd_put_64 (output_bfd, (bfd_vma) 0,
3782 htab->sgot->contents + h->got.offset);
3783 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
3787 loc = htab->srelgot->contents;
3788 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3789 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3794 Elf_Internal_Rela rela;
3797 /* This symbol needs a copy reloc. Set it up. */
3799 if (h->dynindx == -1
3800 || (h->root.type != bfd_link_hash_defined
3801 && h->root.type != bfd_link_hash_defweak)
3802 || htab->srelbss == NULL)
3805 rela.r_offset = (h->root.u.def.value
3806 + h->root.u.def.section->output_section->vma
3807 + h->root.u.def.section->output_offset);
3808 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
3810 loc = htab->srelbss->contents;
3811 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3812 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3815 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3816 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3817 || h == htab->elf.hgot)
3818 sym->st_shndx = SHN_ABS;
3823 /* Used to decide how to sort relocs in an optimal manner for the
3824 dynamic linker, before writing them out. */
3826 static enum elf_reloc_type_class
3827 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
3829 switch ((int) ELF64_R_TYPE (rela->r_info))
3831 case R_X86_64_RELATIVE:
3832 return reloc_class_relative;
3833 case R_X86_64_JUMP_SLOT:
3834 return reloc_class_plt;
3836 return reloc_class_copy;
3838 return reloc_class_normal;
3842 /* Finish up the dynamic sections. */
3845 elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3847 struct elf64_x86_64_link_hash_table *htab;
3851 htab = elf64_x86_64_hash_table (info);
3852 dynobj = htab->elf.dynobj;
3853 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3855 if (htab->elf.dynamic_sections_created)
3857 Elf64_External_Dyn *dyncon, *dynconend;
3859 if (sdyn == NULL || htab->sgot == NULL)
3862 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3863 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3864 for (; dyncon < dynconend; dyncon++)
3866 Elf_Internal_Dyn dyn;
3869 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3878 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3882 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3886 s = htab->srelplt->output_section;
3887 dyn.d_un.d_val = s->size;
3891 /* The procedure linkage table relocs (DT_JMPREL) should
3892 not be included in the overall relocs (DT_RELA).
3893 Therefore, we override the DT_RELASZ entry here to
3894 make it not include the JMPREL relocs. Since the
3895 linker script arranges for .rela.plt to follow all
3896 other relocation sections, we don't have to worry
3897 about changing the DT_RELA entry. */
3898 if (htab->srelplt != NULL)
3900 s = htab->srelplt->output_section;
3901 dyn.d_un.d_val -= s->size;
3905 case DT_TLSDESC_PLT:
3907 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
3908 + htab->tlsdesc_plt;
3911 case DT_TLSDESC_GOT:
3913 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
3914 + htab->tlsdesc_got;
3918 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3921 /* Fill in the special first entry in the procedure linkage table. */
3922 if (htab->splt && htab->splt->size > 0)
3924 /* Fill in the first entry in the procedure linkage table. */
3925 memcpy (htab->splt->contents, elf64_x86_64_plt0_entry,
3927 /* Add offset for pushq GOT+8(%rip), since the instruction
3928 uses 6 bytes subtract this value. */
3929 bfd_put_32 (output_bfd,
3930 (htab->sgotplt->output_section->vma
3931 + htab->sgotplt->output_offset
3933 - htab->splt->output_section->vma
3934 - htab->splt->output_offset
3936 htab->splt->contents + 2);
3937 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
3938 the end of the instruction. */
3939 bfd_put_32 (output_bfd,
3940 (htab->sgotplt->output_section->vma
3941 + htab->sgotplt->output_offset
3943 - htab->splt->output_section->vma
3944 - htab->splt->output_offset
3946 htab->splt->contents + 8);
3948 elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize =
3951 if (htab->tlsdesc_plt)
3953 bfd_put_64 (output_bfd, (bfd_vma) 0,
3954 htab->sgot->contents + htab->tlsdesc_got);
3956 memcpy (htab->splt->contents + htab->tlsdesc_plt,
3957 elf64_x86_64_plt0_entry,
3960 /* Add offset for pushq GOT+8(%rip), since the
3961 instruction uses 6 bytes subtract this value. */
3962 bfd_put_32 (output_bfd,
3963 (htab->sgotplt->output_section->vma
3964 + htab->sgotplt->output_offset
3966 - htab->splt->output_section->vma
3967 - htab->splt->output_offset
3970 htab->splt->contents + htab->tlsdesc_plt + 2);
3971 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
3972 htab->tlsdesc_got. The 12 is the offset to the end of
3974 bfd_put_32 (output_bfd,
3975 (htab->sgot->output_section->vma
3976 + htab->sgot->output_offset
3978 - htab->splt->output_section->vma
3979 - htab->splt->output_offset
3982 htab->splt->contents + htab->tlsdesc_plt + 8);
3989 /* Fill in the first three entries in the global offset table. */
3990 if (htab->sgotplt->size > 0)
3992 /* Set the first entry in the global offset table to the address of
3993 the dynamic section. */
3995 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents);
3997 bfd_put_64 (output_bfd,
3998 sdyn->output_section->vma + sdyn->output_offset,
3999 htab->sgotplt->contents);
4000 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4001 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE);
4002 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2);
4005 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize =
4009 if (htab->sgot && htab->sgot->size > 0)
4010 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize
4016 /* Return address for Ith PLT stub in section PLT, for relocation REL
4017 or (bfd_vma) -1 if it should not be included. */
4020 elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4021 const arelent *rel ATTRIBUTE_UNUSED)
4023 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4026 /* Handle an x86-64 specific section when reading an object file. This
4027 is called when elfcode.h finds a section with an unknown type. */
4030 elf64_x86_64_section_from_shdr (bfd *abfd,
4031 Elf_Internal_Shdr *hdr,
4035 if (hdr->sh_type != SHT_X86_64_UNWIND)
4038 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4044 /* Hook called by the linker routine which adds symbols from an object
4045 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4049 elf64_x86_64_add_symbol_hook (bfd *abfd,
4050 struct bfd_link_info *info,
4051 Elf_Internal_Sym *sym,
4052 const char **namep ATTRIBUTE_UNUSED,
4053 flagword *flagsp ATTRIBUTE_UNUSED,
4059 switch (sym->st_shndx)
4061 case SHN_X86_64_LCOMMON:
4062 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4065 lcomm = bfd_make_section_with_flags (abfd,
4069 | SEC_LINKER_CREATED));
4072 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4075 *valp = sym->st_size;
4079 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4080 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4086 /* Given a BFD section, try to locate the corresponding ELF section
4090 elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4091 asection *sec, int *index)
4093 if (sec == &_bfd_elf_large_com_section)
4095 *index = SHN_X86_64_LCOMMON;
4101 /* Process a symbol. */
4104 elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4107 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4109 switch (elfsym->internal_elf_sym.st_shndx)
4111 case SHN_X86_64_LCOMMON:
4112 asym->section = &_bfd_elf_large_com_section;
4113 asym->value = elfsym->internal_elf_sym.st_size;
4114 /* Common symbol doesn't set BSF_GLOBAL. */
4115 asym->flags &= ~BSF_GLOBAL;
4121 elf64_x86_64_common_definition (Elf_Internal_Sym *sym)
4123 return (sym->st_shndx == SHN_COMMON
4124 || sym->st_shndx == SHN_X86_64_LCOMMON);
4128 elf64_x86_64_common_section_index (asection *sec)
4130 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4133 return SHN_X86_64_LCOMMON;
4137 elf64_x86_64_common_section (asection *sec)
4139 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4140 return bfd_com_section_ptr;
4142 return &_bfd_elf_large_com_section;
4146 elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4147 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4148 struct elf_link_hash_entry *h,
4149 Elf_Internal_Sym *sym,
4151 bfd_vma *pvalue ATTRIBUTE_UNUSED,
4152 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4153 bfd_boolean *skip ATTRIBUTE_UNUSED,
4154 bfd_boolean *override ATTRIBUTE_UNUSED,
4155 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4156 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4157 bfd_boolean *newdef ATTRIBUTE_UNUSED,
4158 bfd_boolean *newdyn,
4159 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4160 bfd_boolean *newweak ATTRIBUTE_UNUSED,
4161 bfd *abfd ATTRIBUTE_UNUSED,
4163 bfd_boolean *olddef ATTRIBUTE_UNUSED,
4164 bfd_boolean *olddyn,
4165 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4166 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
4170 /* A normal common symbol and a large common symbol result in a
4171 normal common symbol. We turn the large common symbol into a
4174 && h->root.type == bfd_link_hash_common
4176 && bfd_is_com_section (*sec)
4179 if (sym->st_shndx == SHN_COMMON
4180 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4182 h->root.u.c.p->section
4183 = bfd_make_section_old_way (oldbfd, "COMMON");
4184 h->root.u.c.p->section->flags = SEC_ALLOC;
4186 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4187 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
4188 *psec = *sec = bfd_com_section_ptr;
4195 elf64_x86_64_additional_program_headers (bfd *abfd,
4196 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4201 /* Check to see if we need a large readonly segment. */
4202 s = bfd_get_section_by_name (abfd, ".lrodata");
4203 if (s && (s->flags & SEC_LOAD))
4206 /* Check to see if we need a large data segment. Since .lbss sections
4207 is placed right after the .bss section, there should be no need for
4208 a large data segment just because of .lbss. */
4209 s = bfd_get_section_by_name (abfd, ".ldata");
4210 if (s && (s->flags & SEC_LOAD))
4216 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4219 elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4221 if (h->plt.offset != (bfd_vma) -1
4223 && !h->pointer_equality_needed)
4226 return _bfd_elf_hash_symbol (h);
4229 static const struct bfd_elf_special_section
4230 elf64_x86_64_special_sections[]=
4232 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4233 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4234 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4235 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4236 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4237 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4238 { NULL, 0, 0, 0, 0 }
4241 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4242 #define TARGET_LITTLE_NAME "elf64-x86-64"
4243 #define ELF_ARCH bfd_arch_i386
4244 #define ELF_MACHINE_CODE EM_X86_64
4245 #define ELF_MAXPAGESIZE 0x200000
4246 #define ELF_MINPAGESIZE 0x1000
4247 #define ELF_COMMONPAGESIZE 0x1000
4249 #define elf_backend_can_gc_sections 1
4250 #define elf_backend_can_refcount 1
4251 #define elf_backend_want_got_plt 1
4252 #define elf_backend_plt_readonly 1
4253 #define elf_backend_want_plt_sym 0
4254 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4255 #define elf_backend_rela_normal 1
4257 #define elf_info_to_howto elf64_x86_64_info_to_howto
4259 #define bfd_elf64_bfd_link_hash_table_create \
4260 elf64_x86_64_link_hash_table_create
4261 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
4262 #define bfd_elf64_bfd_reloc_name_lookup \
4263 elf64_x86_64_reloc_name_lookup
4265 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
4266 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4267 #define elf_backend_check_relocs elf64_x86_64_check_relocs
4268 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4269 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4270 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4271 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4272 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4273 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
4274 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4275 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
4276 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
4277 #define elf_backend_relocate_section elf64_x86_64_relocate_section
4278 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
4279 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
4280 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4281 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
4282 #define elf_backend_object_p elf64_x86_64_elf_object_p
4283 #define bfd_elf64_mkobject elf64_x86_64_mkobject
4285 #define elf_backend_section_from_shdr \
4286 elf64_x86_64_section_from_shdr
4288 #define elf_backend_section_from_bfd_section \
4289 elf64_x86_64_elf_section_from_bfd_section
4290 #define elf_backend_add_symbol_hook \
4291 elf64_x86_64_add_symbol_hook
4292 #define elf_backend_symbol_processing \
4293 elf64_x86_64_symbol_processing
4294 #define elf_backend_common_section_index \
4295 elf64_x86_64_common_section_index
4296 #define elf_backend_common_section \
4297 elf64_x86_64_common_section
4298 #define elf_backend_common_definition \
4299 elf64_x86_64_common_definition
4300 #define elf_backend_merge_symbol \
4301 elf64_x86_64_merge_symbol
4302 #define elf_backend_special_sections \
4303 elf64_x86_64_special_sections
4304 #define elf_backend_additional_program_headers \
4305 elf64_x86_64_additional_program_headers
4306 #define elf_backend_hash_symbol \
4307 elf64_x86_64_hash_symbol
4309 #undef elf_backend_post_process_headers
4310 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4312 #include "elf64-target.h"
4314 /* FreeBSD support. */
4316 #undef TARGET_LITTLE_SYM
4317 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4318 #undef TARGET_LITTLE_NAME
4319 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4322 #define ELF_OSABI ELFOSABI_FREEBSD
4325 #define elf64_bed elf64_x86_64_fbsd_bed
4327 #include "elf64-target.h"