Commit | Line | Data |
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8d88c4ca | 1 | /* X86-64 specific support for 64-bit ELF |
c434dee6 | 2 | Copyright 2000, 2001, 2002 Free Software Foundation, Inc. |
8d88c4ca NC |
3 | Contributed by Jan Hubicka <jh@suse.cz>. |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
c434dee6 | 23 | #include "bfdlink.h" |
8d88c4ca NC |
24 | #include "libbfd.h" |
25 | #include "elf-bfd.h" | |
26 | ||
27 | #include "elf/x86-64.h" | |
28 | ||
29 | /* We use only the RELA entries. */ | |
c434dee6 | 30 | #define USE_RELA 1 |
8d88c4ca NC |
31 | |
32 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ | |
33 | #define MINUS_ONE (~ (bfd_vma) 0) | |
34 | ||
35 | /* The relocation "howto" table. Order of fields: | |
407443a3 AJ |
36 | type, size, bitsize, pc_relative, complain_on_overflow, |
37 | special_function, name, partial_inplace, src_mask, dst_pack, pcrel_offset. */ | |
70256ad8 AJ |
38 | static reloc_howto_type x86_64_elf_howto_table[] = |
39 | { | |
407443a3 | 40 | HOWTO(R_X86_64_NONE, 0, 0, 0, false, 0, complain_overflow_dont, |
fe4770f4 AJ |
41 | bfd_elf_generic_reloc, "R_X86_64_NONE", false, 0x00000000, 0x00000000, |
42 | false), | |
407443a3 | 43 | HOWTO(R_X86_64_64, 0, 4, 64, false, 0, complain_overflow_bitfield, |
fe4770f4 AJ |
44 | bfd_elf_generic_reloc, "R_X86_64_64", false, MINUS_ONE, MINUS_ONE, |
45 | false), | |
407443a3 | 46 | HOWTO(R_X86_64_PC32, 0, 4, 32, true, 0, complain_overflow_signed, |
fe4770f4 AJ |
47 | bfd_elf_generic_reloc, "R_X86_64_PC32", false, 0xffffffff, 0xffffffff, |
48 | true), | |
407443a3 | 49 | HOWTO(R_X86_64_GOT32, 0, 4, 32, false, 0, complain_overflow_signed, |
fe4770f4 AJ |
50 | bfd_elf_generic_reloc, "R_X86_64_GOT32", false, 0xffffffff, 0xffffffff, |
51 | false), | |
407443a3 | 52 | HOWTO(R_X86_64_PLT32, 0, 4, 32, true, 0, complain_overflow_signed, |
fe4770f4 AJ |
53 | bfd_elf_generic_reloc, "R_X86_64_PLT32", false, 0xffffffff, 0xffffffff, |
54 | true), | |
407443a3 | 55 | HOWTO(R_X86_64_COPY, 0, 4, 32, false, 0, complain_overflow_bitfield, |
fe4770f4 AJ |
56 | bfd_elf_generic_reloc, "R_X86_64_COPY", false, 0xffffffff, 0xffffffff, |
57 | false), | |
407443a3 | 58 | HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield, |
fe4770f4 AJ |
59 | bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", false, MINUS_ONE, |
60 | MINUS_ONE, false), | |
407443a3 | 61 | HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield, |
fe4770f4 AJ |
62 | bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", false, MINUS_ONE, |
63 | MINUS_ONE, false), | |
4a73f21b | 64 | HOWTO(R_X86_64_RELATIVE, 0, 4, 64, false, 0, complain_overflow_bitfield, |
fe4770f4 AJ |
65 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE", false, MINUS_ONE, |
66 | MINUS_ONE, false), | |
407443a3 | 67 | HOWTO(R_X86_64_GOTPCREL, 0, 4, 32, true,0 , complain_overflow_signed, |
fe4770f4 AJ |
68 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", false, 0xffffffff, |
69 | 0xffffffff, true), | |
407443a3 | 70 | HOWTO(R_X86_64_32, 0, 4, 32, false, 0, complain_overflow_unsigned, |
fe4770f4 AJ |
71 | bfd_elf_generic_reloc, "R_X86_64_32", false, 0xffffffff, 0xffffffff, |
72 | false), | |
407443a3 | 73 | HOWTO(R_X86_64_32S, 0, 4, 32, false, 0, complain_overflow_signed, |
fe4770f4 AJ |
74 | bfd_elf_generic_reloc, "R_X86_64_32S", false, 0xffffffff, 0xffffffff, |
75 | false), | |
407443a3 AJ |
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_signed, | |
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, | |
fe4770f4 AJ |
83 | bfd_elf_generic_reloc, "R_X86_64_PC8", false, 0xff, 0xff, true), |
84 | ||
85 | /* GNU extension to record C++ vtable hierarchy. */ | |
86 | HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, false, 0, complain_overflow_dont, | |
87 | NULL, "R_X86_64_GNU_VTINHERIT", false, 0, 0, false), | |
88 | ||
89 | /* GNU extension to record C++ vtable member usage. */ | |
90 | HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, false, 0, complain_overflow_dont, | |
91 | _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", false, 0, 0, | |
92 | false) | |
8d88c4ca NC |
93 | }; |
94 | ||
95 | /* Map BFD relocs to the x86_64 elf relocs. */ | |
70256ad8 AJ |
96 | struct elf_reloc_map |
97 | { | |
8d88c4ca NC |
98 | bfd_reloc_code_real_type bfd_reloc_val; |
99 | unsigned char elf_reloc_val; | |
100 | }; | |
101 | ||
dc810e39 | 102 | static const struct elf_reloc_map x86_64_reloc_map[] = |
8d88c4ca | 103 | { |
70256ad8 AJ |
104 | { BFD_RELOC_NONE, R_X86_64_NONE, }, |
105 | { BFD_RELOC_64, R_X86_64_64, }, | |
106 | { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, | |
107 | { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, | |
108 | { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, | |
109 | { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, | |
110 | { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, | |
111 | { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, | |
112 | { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, | |
113 | { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, | |
114 | { BFD_RELOC_32, R_X86_64_32, }, | |
115 | { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, | |
116 | { BFD_RELOC_16, R_X86_64_16, }, | |
117 | { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, | |
118 | { BFD_RELOC_8, R_X86_64_8, }, | |
119 | { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, | |
fe4770f4 AJ |
120 | { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, |
121 | { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, | |
8d88c4ca NC |
122 | }; |
123 | ||
8d88c4ca NC |
124 | static reloc_howto_type *elf64_x86_64_reloc_type_lookup |
125 | PARAMS ((bfd *, bfd_reloc_code_real_type)); | |
126 | static void elf64_x86_64_info_to_howto | |
127 | PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *)); | |
cedb70c5 | 128 | static boolean elf64_x86_64_grok_prstatus |
3bab7989 | 129 | PARAMS ((bfd *, Elf_Internal_Note *)); |
cedb70c5 | 130 | static boolean elf64_x86_64_grok_psinfo |
3bab7989 | 131 | PARAMS ((bfd *, Elf_Internal_Note *)); |
8d88c4ca NC |
132 | static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create |
133 | PARAMS ((bfd *)); | |
1e1b3bc2 | 134 | static boolean elf64_x86_64_elf_object_p PARAMS ((bfd *abfd)); |
c434dee6 AJ |
135 | static boolean create_got_section |
136 | PARAMS((bfd *, struct bfd_link_info *)); | |
137 | static boolean elf64_x86_64_create_dynamic_sections | |
138 | PARAMS((bfd *, struct bfd_link_info *)); | |
139 | static void elf64_x86_64_copy_indirect_symbol | |
140 | PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *)); | |
1e1b3bc2 AJ |
141 | static boolean elf64_x86_64_check_relocs |
142 | PARAMS ((bfd *, struct bfd_link_info *, asection *sec, | |
143 | const Elf_Internal_Rela *)); | |
144 | static asection *elf64_x86_64_gc_mark_hook | |
145 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, | |
146 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
147 | ||
148 | static boolean elf64_x86_64_gc_sweep_hook | |
149 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
150 | const Elf_Internal_Rela *)); | |
70256ad8 | 151 | |
c434dee6 | 152 | static struct bfd_hash_entry *link_hash_newfunc |
70256ad8 AJ |
153 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
154 | static boolean elf64_x86_64_adjust_dynamic_symbol | |
155 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
156 | ||
c434dee6 AJ |
157 | static boolean allocate_dynrelocs |
158 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
159 | static boolean readonly_dynrelocs | |
160 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
70256ad8 AJ |
161 | static boolean elf64_x86_64_size_dynamic_sections |
162 | PARAMS ((bfd *, struct bfd_link_info *)); | |
8d88c4ca NC |
163 | static boolean elf64_x86_64_relocate_section |
164 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
407443a3 | 165 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
70256ad8 AJ |
166 | static boolean elf64_x86_64_finish_dynamic_symbol |
167 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
168 | Elf_Internal_Sym *sym)); | |
169 | static boolean elf64_x86_64_finish_dynamic_sections | |
170 | PARAMS ((bfd *, struct bfd_link_info *)); | |
f51e552e AM |
171 | static enum elf_reloc_type_class elf64_x86_64_reloc_type_class |
172 | PARAMS ((const Elf_Internal_Rela *)); | |
8d88c4ca NC |
173 | |
174 | /* Given a BFD reloc type, return a HOWTO structure. */ | |
175 | static reloc_howto_type * | |
176 | elf64_x86_64_reloc_type_lookup (abfd, code) | |
177 | bfd *abfd ATTRIBUTE_UNUSED; | |
178 | bfd_reloc_code_real_type code; | |
179 | { | |
180 | unsigned int i; | |
181 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); | |
182 | i++) | |
183 | { | |
184 | if (x86_64_reloc_map[i].bfd_reloc_val == code) | |
ffaef159 | 185 | return &x86_64_elf_howto_table[i]; |
8d88c4ca NC |
186 | } |
187 | return 0; | |
188 | } | |
189 | ||
8d88c4ca | 190 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ |
8da6118f | 191 | |
8d88c4ca NC |
192 | static void |
193 | elf64_x86_64_info_to_howto (abfd, cache_ptr, dst) | |
194 | bfd *abfd ATTRIBUTE_UNUSED; | |
195 | arelent *cache_ptr; | |
196 | Elf64_Internal_Rela *dst; | |
197 | { | |
fe4770f4 | 198 | unsigned r_type, i; |
8d88c4ca NC |
199 | |
200 | r_type = ELF64_R_TYPE (dst->r_info); | |
fe4770f4 AJ |
201 | if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT) |
202 | { | |
203 | BFD_ASSERT (r_type <= (unsigned int) R_X86_64_PC8); | |
204 | i = r_type; | |
205 | } | |
206 | else | |
207 | { | |
208 | BFD_ASSERT (r_type < (unsigned int) R_X86_64_max); | |
209 | i = r_type - ((unsigned int) R_X86_64_GNU_VTINHERIT - R_X86_64_PC8 - 1); | |
210 | } | |
211 | cache_ptr->howto = &x86_64_elf_howto_table[i]; | |
8d88c4ca NC |
212 | BFD_ASSERT (r_type == cache_ptr->howto->type); |
213 | } | |
70256ad8 | 214 | \f |
3bab7989 ML |
215 | /* Support for core dump NOTE sections. */ |
216 | static boolean | |
217 | elf64_x86_64_grok_prstatus (abfd, note) | |
218 | bfd *abfd; | |
219 | Elf_Internal_Note *note; | |
220 | { | |
221 | int offset; | |
222 | size_t raw_size; | |
223 | ||
224 | switch (note->descsz) | |
225 | { | |
226 | default: | |
227 | return false; | |
228 | ||
229 | case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ | |
230 | /* pr_cursig */ | |
cedb70c5 | 231 | elf_tdata (abfd)->core_signal |
3bab7989 ML |
232 | = bfd_get_16 (abfd, note->descdata + 12); |
233 | ||
234 | /* pr_pid */ | |
cedb70c5 | 235 | elf_tdata (abfd)->core_pid |
3bab7989 ML |
236 | = bfd_get_32 (abfd, note->descdata + 32); |
237 | ||
238 | /* pr_reg */ | |
239 | offset = 112; | |
240 | raw_size = 216; | |
241 | ||
242 | break; | |
243 | } | |
244 | ||
245 | /* Make a ".reg/999" section. */ | |
246 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", | |
247 | raw_size, note->descpos + offset); | |
248 | } | |
249 | ||
250 | static boolean | |
251 | elf64_x86_64_grok_psinfo (abfd, note) | |
252 | bfd *abfd; | |
253 | Elf_Internal_Note *note; | |
254 | { | |
255 | switch (note->descsz) | |
256 | { | |
257 | default: | |
258 | return false; | |
259 | ||
260 | case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ | |
261 | elf_tdata (abfd)->core_program | |
262 | = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); | |
263 | elf_tdata (abfd)->core_command | |
264 | = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); | |
265 | } | |
266 | ||
267 | /* Note that for some reason, a spurious space is tacked | |
268 | onto the end of the args in some (at least one anyway) | |
269 | implementations, so strip it off if it exists. */ | |
270 | ||
271 | { | |
272 | char *command = elf_tdata (abfd)->core_command; | |
273 | int n = strlen (command); | |
274 | ||
275 | if (0 < n && command[n - 1] == ' ') | |
276 | command[n - 1] = '\0'; | |
277 | } | |
278 | ||
279 | return true; | |
280 | } | |
281 | \f | |
407443a3 | 282 | /* Functions for the x86-64 ELF linker. */ |
70256ad8 | 283 | |
407443a3 | 284 | /* The name of the dynamic interpreter. This is put in the .interp |
70256ad8 AJ |
285 | section. */ |
286 | ||
407443a3 | 287 | #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1" |
70256ad8 AJ |
288 | |
289 | /* The size in bytes of an entry in the global offset table. */ | |
290 | ||
291 | #define GOT_ENTRY_SIZE 8 | |
8d88c4ca | 292 | |
70256ad8 | 293 | /* The size in bytes of an entry in the procedure linkage table. */ |
8d88c4ca | 294 | |
70256ad8 AJ |
295 | #define PLT_ENTRY_SIZE 16 |
296 | ||
297 | /* The first entry in a procedure linkage table looks like this. See the | |
298 | SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ | |
299 | ||
300 | static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] = | |
301 | { | |
653165cc AJ |
302 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
303 | 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ | |
304 | 0x90, 0x90, 0x90, 0x90 /* pad out to 16 bytes with nops. */ | |
70256ad8 AJ |
305 | }; |
306 | ||
307 | /* Subsequent entries in a procedure linkage table look like this. */ | |
308 | ||
309 | static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] = | |
310 | { | |
653165cc | 311 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
407443a3 | 312 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
653165cc | 313 | 0x68, /* pushq immediate */ |
70256ad8 AJ |
314 | 0, 0, 0, 0, /* replaced with index into relocation table. */ |
315 | 0xe9, /* jmp relative */ | |
316 | 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ | |
317 | }; | |
318 | ||
319 | /* The x86-64 linker needs to keep track of the number of relocs that | |
985142a4 | 320 | it decides to copy as dynamic relocs in check_relocs for each symbol. |
c434dee6 AJ |
321 | This is so that it can later discard them if they are found to be |
322 | unnecessary. We store the information in a field extending the | |
323 | regular ELF linker hash table. */ | |
70256ad8 | 324 | |
c434dee6 | 325 | struct elf64_x86_64_dyn_relocs |
70256ad8 AJ |
326 | { |
327 | /* Next section. */ | |
c434dee6 AJ |
328 | struct elf64_x86_64_dyn_relocs *next; |
329 | ||
330 | /* The input section of the reloc. */ | |
331 | asection *sec; | |
332 | ||
333 | /* Total number of relocs copied for the input section. */ | |
70256ad8 | 334 | bfd_size_type count; |
c434dee6 AJ |
335 | |
336 | /* Number of pc-relative relocs copied for the input section. */ | |
337 | bfd_size_type pc_count; | |
70256ad8 AJ |
338 | }; |
339 | ||
340 | /* x86-64 ELF linker hash entry. */ | |
341 | ||
342 | struct elf64_x86_64_link_hash_entry | |
343 | { | |
c434dee6 | 344 | struct elf_link_hash_entry elf; |
70256ad8 | 345 | |
c434dee6 AJ |
346 | /* Track dynamic relocs copied for this symbol. */ |
347 | struct elf64_x86_64_dyn_relocs *dyn_relocs; | |
70256ad8 AJ |
348 | }; |
349 | ||
c434dee6 | 350 | /* x86-64 ELF linker hash table. */ |
8d88c4ca | 351 | |
407443a3 AJ |
352 | struct elf64_x86_64_link_hash_table |
353 | { | |
c434dee6 | 354 | struct elf_link_hash_table elf; |
70256ad8 | 355 | |
c434dee6 AJ |
356 | /* Short-cuts to get to dynamic linker sections. */ |
357 | asection *sgot; | |
358 | asection *sgotplt; | |
359 | asection *srelgot; | |
360 | asection *splt; | |
361 | asection *srelplt; | |
362 | asection *sdynbss; | |
363 | asection *srelbss; | |
70256ad8 | 364 | |
c434dee6 AJ |
365 | /* Small local sym to section mapping cache. */ |
366 | struct sym_sec_cache sym_sec; | |
367 | }; | |
70256ad8 AJ |
368 | |
369 | /* Get the x86-64 ELF linker hash table from a link_info structure. */ | |
8d88c4ca NC |
370 | |
371 | #define elf64_x86_64_hash_table(p) \ | |
372 | ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) | |
373 | ||
407443a3 | 374 | /* Create an entry in an x86-64 ELF linker hash table. */ |
70256ad8 AJ |
375 | |
376 | static struct bfd_hash_entry * | |
c434dee6 | 377 | link_hash_newfunc (entry, table, string) |
70256ad8 AJ |
378 | struct bfd_hash_entry *entry; |
379 | struct bfd_hash_table *table; | |
380 | const char *string; | |
381 | { | |
70256ad8 | 382 | /* Allocate the structure if it has not already been allocated by a |
c434dee6 AJ |
383 | subclass. */ |
384 | if (entry == NULL) | |
385 | { | |
386 | entry = bfd_hash_allocate (table, | |
387 | sizeof (struct elf64_x86_64_link_hash_entry)); | |
388 | if (entry == NULL) | |
389 | return entry; | |
390 | } | |
70256ad8 AJ |
391 | |
392 | /* Call the allocation method of the superclass. */ | |
c434dee6 AJ |
393 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
394 | if (entry != NULL) | |
70256ad8 | 395 | { |
c434dee6 AJ |
396 | struct elf64_x86_64_link_hash_entry *eh; |
397 | ||
398 | eh = (struct elf64_x86_64_link_hash_entry *) entry; | |
399 | eh->dyn_relocs = NULL; | |
70256ad8 AJ |
400 | } |
401 | ||
c434dee6 | 402 | return entry; |
70256ad8 AJ |
403 | } |
404 | ||
8d88c4ca NC |
405 | /* Create an X86-64 ELF linker hash table. */ |
406 | ||
407 | static struct bfd_link_hash_table * | |
408 | elf64_x86_64_link_hash_table_create (abfd) | |
409 | bfd *abfd; | |
410 | { | |
411 | struct elf64_x86_64_link_hash_table *ret; | |
dc810e39 | 412 | bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table); |
8d88c4ca | 413 | |
e2d34d7d | 414 | ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt); |
c434dee6 | 415 | if (ret == NULL) |
8d88c4ca NC |
416 | return NULL; |
417 | ||
c434dee6 | 418 | if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) |
8d88c4ca | 419 | { |
e2d34d7d | 420 | free (ret); |
8d88c4ca NC |
421 | return NULL; |
422 | } | |
423 | ||
c434dee6 AJ |
424 | ret->sgot = NULL; |
425 | ret->sgotplt = NULL; | |
426 | ret->srelgot = NULL; | |
427 | ret->splt = NULL; | |
428 | ret->srelplt = NULL; | |
429 | ret->sdynbss = NULL; | |
430 | ret->srelbss = NULL; | |
431 | ret->sym_sec.abfd = NULL; | |
432 | ||
433 | return &ret->elf.root; | |
434 | } | |
435 | ||
436 | /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up | |
437 | shortcuts to them in our hash table. */ | |
438 | ||
439 | static boolean | |
440 | create_got_section (dynobj, info) | |
441 | bfd *dynobj; | |
442 | struct bfd_link_info *info; | |
443 | { | |
444 | struct elf64_x86_64_link_hash_table *htab; | |
445 | ||
446 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
447 | return false; | |
448 | ||
449 | htab = elf64_x86_64_hash_table (info); | |
450 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); | |
451 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); | |
452 | if (!htab->sgot || !htab->sgotplt) | |
453 | abort (); | |
454 | ||
455 | htab->srelgot = bfd_make_section (dynobj, ".rela.got"); | |
456 | if (htab->srelgot == NULL | |
457 | || ! bfd_set_section_flags (dynobj, htab->srelgot, | |
458 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | |
459 | | SEC_IN_MEMORY | SEC_LINKER_CREATED | |
460 | | SEC_READONLY)) | |
461 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) | |
462 | return false; | |
463 | return true; | |
464 | } | |
465 | ||
466 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and | |
467 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our | |
468 | hash table. */ | |
469 | ||
470 | static boolean | |
471 | elf64_x86_64_create_dynamic_sections (dynobj, info) | |
472 | bfd *dynobj; | |
473 | struct bfd_link_info *info; | |
474 | { | |
475 | struct elf64_x86_64_link_hash_table *htab; | |
476 | ||
477 | htab = elf64_x86_64_hash_table (info); | |
478 | if (!htab->sgot && !create_got_section (dynobj, info)) | |
479 | return false; | |
480 | ||
481 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) | |
482 | return false; | |
483 | ||
484 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); | |
485 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
486 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); | |
487 | if (!info->shared) | |
488 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); | |
489 | ||
490 | if (!htab->splt || !htab->srelplt || !htab->sdynbss | |
491 | || (!info->shared && !htab->srelbss)) | |
492 | abort (); | |
493 | ||
494 | return true; | |
495 | } | |
496 | ||
497 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
498 | ||
499 | static void | |
500 | elf64_x86_64_copy_indirect_symbol (dir, ind) | |
501 | struct elf_link_hash_entry *dir, *ind; | |
502 | { | |
503 | struct elf64_x86_64_link_hash_entry *edir, *eind; | |
504 | ||
505 | edir = (struct elf64_x86_64_link_hash_entry *) dir; | |
506 | eind = (struct elf64_x86_64_link_hash_entry *) ind; | |
507 | ||
508 | if (eind->dyn_relocs != NULL) | |
509 | { | |
510 | if (edir->dyn_relocs != NULL) | |
511 | { | |
512 | struct elf64_x86_64_dyn_relocs **pp; | |
513 | struct elf64_x86_64_dyn_relocs *p; | |
514 | ||
515 | if (ind->root.type == bfd_link_hash_indirect) | |
516 | abort (); | |
517 | ||
518 | /* Add reloc counts against the weak sym to the strong sym | |
519 | list. Merge any entries against the same section. */ | |
520 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) | |
521 | { | |
522 | struct elf64_x86_64_dyn_relocs *q; | |
523 | ||
524 | for (q = edir->dyn_relocs; q != NULL; q = q->next) | |
525 | if (q->sec == p->sec) | |
526 | { | |
527 | q->pc_count += p->pc_count; | |
528 | q->count += p->count; | |
529 | *pp = p->next; | |
530 | break; | |
531 | } | |
532 | if (q == NULL) | |
533 | pp = &p->next; | |
534 | } | |
535 | *pp = edir->dyn_relocs; | |
536 | } | |
537 | ||
538 | edir->dyn_relocs = eind->dyn_relocs; | |
539 | eind->dyn_relocs = NULL; | |
540 | } | |
541 | ||
542 | _bfd_elf_link_hash_copy_indirect (dir, ind); | |
8d88c4ca NC |
543 | } |
544 | ||
1e1b3bc2 | 545 | static boolean |
8d88c4ca NC |
546 | elf64_x86_64_elf_object_p (abfd) |
547 | bfd *abfd; | |
548 | { | |
549 | /* Set the right machine number for an x86-64 elf64 file. */ | |
550 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); | |
551 | return true; | |
552 | } | |
553 | ||
70256ad8 | 554 | /* Look through the relocs for a section during the first phase, and |
c434dee6 AJ |
555 | calculate needed space in the global offset table, procedure |
556 | linkage table, and dynamic reloc sections. */ | |
70256ad8 AJ |
557 | |
558 | static boolean | |
559 | elf64_x86_64_check_relocs (abfd, info, sec, relocs) | |
560 | bfd *abfd; | |
561 | struct bfd_link_info *info; | |
562 | asection *sec; | |
563 | const Elf_Internal_Rela *relocs; | |
564 | { | |
c434dee6 | 565 | struct elf64_x86_64_link_hash_table *htab; |
70256ad8 AJ |
566 | Elf_Internal_Shdr *symtab_hdr; |
567 | struct elf_link_hash_entry **sym_hashes; | |
70256ad8 AJ |
568 | const Elf_Internal_Rela *rel; |
569 | const Elf_Internal_Rela *rel_end; | |
70256ad8 AJ |
570 | asection *sreloc; |
571 | ||
572 | if (info->relocateable) | |
573 | return true; | |
574 | ||
c434dee6 | 575 | htab = elf64_x86_64_hash_table (info); |
70256ad8 AJ |
576 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
577 | sym_hashes = elf_sym_hashes (abfd); | |
70256ad8 | 578 | |
c434dee6 AJ |
579 | sreloc = NULL; |
580 | ||
70256ad8 AJ |
581 | rel_end = relocs + sec->reloc_count; |
582 | for (rel = relocs; rel < rel_end; rel++) | |
583 | { | |
584 | unsigned long r_symndx; | |
585 | struct elf_link_hash_entry *h; | |
586 | ||
587 | r_symndx = ELF64_R_SYM (rel->r_info); | |
c434dee6 AJ |
588 | |
589 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) | |
590 | { | |
591 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), | |
592 | bfd_archive_filename (abfd), | |
593 | r_symndx); | |
594 | return false; | |
595 | } | |
596 | ||
70256ad8 AJ |
597 | if (r_symndx < symtab_hdr->sh_info) |
598 | h = NULL; | |
599 | else | |
600 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
601 | ||
70256ad8 AJ |
602 | switch (ELF64_R_TYPE (rel->r_info)) |
603 | { | |
604 | case R_X86_64_GOT32: | |
c434dee6 | 605 | case R_X86_64_GOTPCREL: |
407443a3 | 606 | /* This symbol requires a global offset table entry. */ |
70256ad8 AJ |
607 | if (h != NULL) |
608 | { | |
51b64d56 | 609 | h->got.refcount += 1; |
70256ad8 AJ |
610 | } |
611 | else | |
612 | { | |
c434dee6 AJ |
613 | bfd_signed_vma *local_got_refcounts; |
614 | ||
70256ad8 | 615 | /* This is a global offset table entry for a local symbol. */ |
c434dee6 | 616 | local_got_refcounts = elf_local_got_refcounts (abfd); |
70256ad8 AJ |
617 | if (local_got_refcounts == NULL) |
618 | { | |
dc810e39 | 619 | bfd_size_type size; |
70256ad8 | 620 | |
dc810e39 AM |
621 | size = symtab_hdr->sh_info; |
622 | size *= sizeof (bfd_signed_vma); | |
70256ad8 | 623 | local_got_refcounts = ((bfd_signed_vma *) |
51b64d56 | 624 | bfd_zalloc (abfd, size)); |
70256ad8 AJ |
625 | if (local_got_refcounts == NULL) |
626 | return false; | |
627 | elf_local_got_refcounts (abfd) = local_got_refcounts; | |
70256ad8 | 628 | } |
51b64d56 | 629 | local_got_refcounts[r_symndx] += 1; |
70256ad8 | 630 | } |
c434dee6 AJ |
631 | /* Fall through */ |
632 | ||
633 | //case R_X86_64_GOTPCREL: | |
634 | if (htab->sgot == NULL) | |
635 | { | |
636 | if (htab->elf.dynobj == NULL) | |
637 | htab->elf.dynobj = abfd; | |
638 | if (!create_got_section (htab->elf.dynobj, info)) | |
639 | return false; | |
640 | } | |
70256ad8 AJ |
641 | break; |
642 | ||
643 | case R_X86_64_PLT32: | |
644 | /* This symbol requires a procedure linkage table entry. We | |
407443a3 AJ |
645 | actually build the entry in adjust_dynamic_symbol, |
646 | because this might be a case of linking PIC code which is | |
647 | never referenced by a dynamic object, in which case we | |
648 | don't need to generate a procedure linkage table entry | |
649 | after all. */ | |
70256ad8 AJ |
650 | |
651 | /* If this is a local symbol, we resolve it directly without | |
407443a3 | 652 | creating a procedure linkage table entry. */ |
70256ad8 AJ |
653 | if (h == NULL) |
654 | continue; | |
655 | ||
cc78d0af | 656 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
51b64d56 | 657 | h->plt.refcount += 1; |
70256ad8 AJ |
658 | break; |
659 | ||
cc78d0af AJ |
660 | case R_X86_64_8: |
661 | case R_X86_64_16: | |
70256ad8 | 662 | case R_X86_64_32: |
cc78d0af | 663 | case R_X86_64_64: |
70256ad8 | 664 | case R_X86_64_32S: |
c434dee6 AJ |
665 | case R_X86_64_PC8: |
666 | case R_X86_64_PC16: | |
70256ad8 | 667 | case R_X86_64_PC32: |
c434dee6 AJ |
668 | if (h != NULL && !info->shared) |
669 | { | |
670 | /* If this reloc is in a read-only section, we might | |
671 | need a copy reloc. We can't check reliably at this | |
672 | stage whether the section is read-only, as input | |
673 | sections have not yet been mapped to output sections. | |
674 | Tentatively set the flag for now, and correct in | |
675 | adjust_dynamic_symbol. */ | |
676 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; | |
677 | ||
678 | /* We may need a .plt entry if the function this reloc | |
679 | refers to is in a shared lib. */ | |
680 | h->plt.refcount += 1; | |
681 | } | |
70256ad8 AJ |
682 | |
683 | /* If we are creating a shared library, and this is a reloc | |
684 | against a global symbol, or a non PC relative reloc | |
685 | against a local symbol, then we need to copy the reloc | |
686 | into the shared library. However, if we are linking with | |
687 | -Bsymbolic, we do not need to copy a reloc against a | |
688 | global symbol which is defined in an object we are | |
407443a3 | 689 | including in the link (i.e., DEF_REGULAR is set). At |
70256ad8 AJ |
690 | this point we have not seen all the input files, so it is |
691 | possible that DEF_REGULAR is not set now but will be set | |
c434dee6 AJ |
692 | later (it is never cleared). In case of a weak definition, |
693 | DEF_REGULAR may be cleared later by a strong definition in | |
694 | a shared library. We account for that possibility below by | |
695 | storing information in the relocs_copied field of the hash | |
696 | table entry. A similar situation occurs when creating | |
697 | shared libraries and symbol visibility changes render the | |
698 | symbol local. | |
699 | ||
700 | If on the other hand, we are creating an executable, we | |
701 | may need to keep relocations for symbols satisfied by a | |
702 | dynamic library if we manage to avoid copy relocs for the | |
703 | symbol. */ | |
704 | if ((info->shared | |
705 | && (sec->flags & SEC_ALLOC) != 0 | |
706 | && (((ELF64_R_TYPE (rel->r_info) != R_X86_64_PC8) | |
707 | && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC16) | |
708 | && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC32)) | |
709 | || (h != NULL | |
710 | && (! info->symbolic | |
711 | || h->root.type == bfd_link_hash_defweak | |
712 | || (h->elf_link_hash_flags | |
713 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
714 | || (!info->shared | |
715 | && (sec->flags & SEC_ALLOC) != 0 | |
716 | && h != NULL | |
717 | && (h->root.type == bfd_link_hash_defweak | |
718 | || (h->elf_link_hash_flags | |
719 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) | |
70256ad8 | 720 | { |
c434dee6 AJ |
721 | struct elf64_x86_64_dyn_relocs *p; |
722 | struct elf64_x86_64_dyn_relocs **head; | |
723 | ||
724 | /* We must copy these reloc types into the output file. | |
725 | Create a reloc section in dynobj and make room for | |
726 | this reloc. */ | |
70256ad8 AJ |
727 | if (sreloc == NULL) |
728 | { | |
729 | const char *name; | |
c434dee6 | 730 | bfd *dynobj; |
70256ad8 AJ |
731 | |
732 | name = (bfd_elf_string_from_elf_section | |
733 | (abfd, | |
734 | elf_elfheader (abfd)->e_shstrndx, | |
735 | elf_section_data (sec)->rel_hdr.sh_name)); | |
736 | if (name == NULL) | |
737 | return false; | |
738 | ||
c434dee6 AJ |
739 | if (strncmp (name, ".rela", 5) != 0 |
740 | || strcmp (bfd_get_section_name (abfd, sec), | |
741 | name + 5) != 0) | |
742 | { | |
743 | (*_bfd_error_handler) | |
744 | (_("%s: bad relocation section name `%s\'"), | |
745 | bfd_archive_filename (abfd), name); | |
746 | } | |
747 | ||
748 | if (htab->elf.dynobj == NULL) | |
749 | htab->elf.dynobj = abfd; | |
750 | ||
751 | dynobj = htab->elf.dynobj; | |
70256ad8 AJ |
752 | |
753 | sreloc = bfd_get_section_by_name (dynobj, name); | |
754 | if (sreloc == NULL) | |
755 | { | |
756 | flagword flags; | |
757 | ||
758 | sreloc = bfd_make_section (dynobj, name); | |
759 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
760 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
761 | if ((sec->flags & SEC_ALLOC) != 0) | |
762 | flags |= SEC_ALLOC | SEC_LOAD; | |
763 | if (sreloc == NULL | |
764 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
cc78d0af | 765 | || ! bfd_set_section_alignment (dynobj, sreloc, 3)) |
70256ad8 AJ |
766 | return false; |
767 | } | |
c434dee6 | 768 | elf_section_data (sec)->sreloc = sreloc; |
70256ad8 AJ |
769 | } |
770 | ||
c434dee6 AJ |
771 | /* If this is a global symbol, we count the number of |
772 | relocations we need for this symbol. */ | |
773 | if (h != NULL) | |
70256ad8 | 774 | { |
c434dee6 AJ |
775 | head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs; |
776 | } | |
777 | else | |
778 | { | |
779 | /* Track dynamic relocs needed for local syms too. | |
780 | We really need local syms available to do this | |
781 | easily. Oh well. */ | |
782 | ||
783 | asection *s; | |
784 | s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, | |
785 | sec, r_symndx); | |
786 | if (s == NULL) | |
787 | return false; | |
70256ad8 | 788 | |
c434dee6 AJ |
789 | head = ((struct elf64_x86_64_dyn_relocs **) |
790 | &elf_section_data (s)->local_dynrel); | |
791 | } | |
70256ad8 | 792 | |
c434dee6 AJ |
793 | p = *head; |
794 | if (p == NULL || p->sec != sec) | |
795 | { | |
796 | bfd_size_type amt = sizeof *p; | |
797 | p = ((struct elf64_x86_64_dyn_relocs *) | |
798 | bfd_alloc (htab->elf.dynobj, amt)); | |
70256ad8 | 799 | if (p == NULL) |
c434dee6 AJ |
800 | return false; |
801 | p->next = *head; | |
802 | *head = p; | |
803 | p->sec = sec; | |
804 | p->count = 0; | |
805 | p->pc_count = 0; | |
70256ad8 | 806 | } |
c434dee6 AJ |
807 | |
808 | p->count += 1; | |
809 | if (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8 | |
810 | || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16 | |
811 | || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32) | |
812 | p->pc_count += 1; | |
70256ad8 AJ |
813 | } |
814 | break; | |
fe4770f4 AJ |
815 | |
816 | /* This relocation describes the C++ object vtable hierarchy. | |
817 | Reconstruct it for later use during GC. */ | |
818 | case R_X86_64_GNU_VTINHERIT: | |
819 | if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
820 | return false; | |
821 | break; | |
822 | ||
823 | /* This relocation describes which C++ vtable entries are actually | |
824 | used. Record for later use during GC. */ | |
825 | case R_X86_64_GNU_VTENTRY: | |
cc78d0af | 826 | if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
fe4770f4 AJ |
827 | return false; |
828 | break; | |
c434dee6 AJ |
829 | |
830 | default: | |
831 | break; | |
70256ad8 AJ |
832 | } |
833 | } | |
834 | ||
835 | return true; | |
836 | } | |
837 | ||
838 | /* Return the section that should be marked against GC for a given | |
407443a3 | 839 | relocation. */ |
70256ad8 AJ |
840 | |
841 | static asection * | |
842 | elf64_x86_64_gc_mark_hook (abfd, info, rel, h, sym) | |
843 | bfd *abfd; | |
844 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
c434dee6 | 845 | Elf_Internal_Rela *rel; |
70256ad8 AJ |
846 | struct elf_link_hash_entry *h; |
847 | Elf_Internal_Sym *sym; | |
848 | { | |
849 | if (h != NULL) | |
850 | { | |
fe4770f4 | 851 | switch (ELF64_R_TYPE (rel->r_info)) |
70256ad8 | 852 | { |
fe4770f4 AJ |
853 | case R_X86_64_GNU_VTINHERIT: |
854 | case R_X86_64_GNU_VTENTRY: | |
855 | break; | |
70256ad8 AJ |
856 | |
857 | default: | |
fe4770f4 AJ |
858 | switch (h->root.type) |
859 | { | |
860 | case bfd_link_hash_defined: | |
861 | case bfd_link_hash_defweak: | |
862 | return h->root.u.def.section; | |
863 | ||
864 | case bfd_link_hash_common: | |
865 | return h->root.u.c.p->section; | |
866 | ||
867 | default: | |
868 | break; | |
869 | } | |
70256ad8 AJ |
870 | } |
871 | } | |
872 | else | |
873 | { | |
9ad5cbcf | 874 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
70256ad8 AJ |
875 | } |
876 | ||
877 | return NULL; | |
878 | } | |
879 | ||
407443a3 | 880 | /* Update the got entry reference counts for the section being removed. */ |
70256ad8 AJ |
881 | |
882 | static boolean | |
883 | elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs) | |
884 | bfd *abfd; | |
c434dee6 | 885 | struct bfd_link_info *info; |
70256ad8 AJ |
886 | asection *sec; |
887 | const Elf_Internal_Rela *relocs; | |
888 | { | |
889 | Elf_Internal_Shdr *symtab_hdr; | |
890 | struct elf_link_hash_entry **sym_hashes; | |
891 | bfd_signed_vma *local_got_refcounts; | |
892 | const Elf_Internal_Rela *rel, *relend; | |
893 | unsigned long r_symndx; | |
894 | struct elf_link_hash_entry *h; | |
c434dee6 AJ |
895 | |
896 | elf_section_data (sec)->local_dynrel = NULL; | |
70256ad8 AJ |
897 | |
898 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
899 | sym_hashes = elf_sym_hashes (abfd); | |
900 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
901 | ||
70256ad8 AJ |
902 | relend = relocs + sec->reloc_count; |
903 | for (rel = relocs; rel < relend; rel++) | |
904 | switch (ELF64_R_TYPE (rel->r_info)) | |
905 | { | |
906 | case R_X86_64_GOT32: | |
907 | case R_X86_64_GOTPCREL: | |
908 | r_symndx = ELF64_R_SYM (rel->r_info); | |
909 | if (r_symndx >= symtab_hdr->sh_info) | |
910 | { | |
911 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
912 | if (h->got.refcount > 0) | |
c434dee6 | 913 | h->got.refcount -= 1; |
70256ad8 AJ |
914 | } |
915 | else if (local_got_refcounts != NULL) | |
916 | { | |
917 | if (local_got_refcounts[r_symndx] > 0) | |
c434dee6 | 918 | local_got_refcounts[r_symndx] -= 1; |
70256ad8 AJ |
919 | } |
920 | break; | |
921 | ||
c434dee6 AJ |
922 | case R_X86_64_8: |
923 | case R_X86_64_16: | |
924 | case R_X86_64_32: | |
925 | case R_X86_64_64: | |
926 | case R_X86_64_32S: | |
927 | case R_X86_64_PC8: | |
928 | case R_X86_64_PC16: | |
929 | case R_X86_64_PC32: | |
930 | r_symndx = ELF64_R_SYM (rel->r_info); | |
931 | if (r_symndx >= symtab_hdr->sh_info) | |
932 | { | |
933 | struct elf64_x86_64_link_hash_entry *eh; | |
934 | struct elf64_x86_64_dyn_relocs **pp; | |
935 | struct elf64_x86_64_dyn_relocs *p; | |
936 | ||
937 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
938 | ||
939 | if (!info->shared && h->plt.refcount > 0) | |
940 | h->plt.refcount -= 1; | |
941 | ||
942 | eh = (struct elf64_x86_64_link_hash_entry *) h; | |
943 | ||
944 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) | |
945 | if (p->sec == sec) | |
946 | { | |
947 | if (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8 | |
948 | || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16 | |
949 | || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32) | |
950 | p->pc_count -= 1; | |
951 | p->count -= 1; | |
952 | if (p->count == 0) | |
953 | *pp = p->next; | |
954 | break; | |
955 | } | |
956 | } | |
957 | break; | |
958 | ||
959 | ||
70256ad8 AJ |
960 | case R_X86_64_PLT32: |
961 | r_symndx = ELF64_R_SYM (rel->r_info); | |
962 | if (r_symndx >= symtab_hdr->sh_info) | |
963 | { | |
964 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
965 | if (h->plt.refcount > 0) | |
966 | h->plt.refcount -= 1; | |
967 | } | |
968 | break; | |
969 | ||
970 | default: | |
971 | break; | |
972 | } | |
973 | ||
974 | return true; | |
975 | } | |
976 | ||
977 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
978 | regular object. The current definition is in some section of the | |
979 | dynamic object, but we're not including those sections. We have to | |
980 | change the definition to something the rest of the link can | |
407443a3 | 981 | understand. */ |
70256ad8 AJ |
982 | |
983 | static boolean | |
984 | elf64_x86_64_adjust_dynamic_symbol (info, h) | |
985 | struct bfd_link_info *info; | |
986 | struct elf_link_hash_entry *h; | |
987 | { | |
c434dee6 AJ |
988 | struct elf64_x86_64_link_hash_table *htab; |
989 | struct elf64_x86_64_link_hash_entry * eh; | |
990 | struct elf64_x86_64_dyn_relocs *p; | |
70256ad8 AJ |
991 | asection *s; |
992 | unsigned int power_of_two; | |
993 | ||
70256ad8 AJ |
994 | /* If this is a function, put it in the procedure linkage table. We |
995 | will fill in the contents of the procedure linkage table later, | |
996 | when we know the address of the .got section. */ | |
997 | if (h->type == STT_FUNC | |
998 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
999 | { | |
c434dee6 AJ |
1000 | if (h->plt.refcount <= 0 |
1001 | || (! info->shared | |
1002 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
1003 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 | |
1004 | && h->root.type != bfd_link_hash_undefweak | |
1005 | && h->root.type != bfd_link_hash_undefined)) | |
70256ad8 | 1006 | { |
70256ad8 AJ |
1007 | /* This case can occur if we saw a PLT32 reloc in an input |
1008 | file, but the symbol was never referred to by a dynamic | |
1009 | object, or if all references were garbage collected. In | |
1010 | such a case, we don't actually need to build a procedure | |
1011 | linkage table, and we can just do a PC32 reloc instead. */ | |
70256ad8 AJ |
1012 | h->plt.offset = (bfd_vma) -1; |
1013 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
70256ad8 AJ |
1014 | } |
1015 | ||
70256ad8 AJ |
1016 | return true; |
1017 | } | |
bbd7ec4a | 1018 | else |
c434dee6 AJ |
1019 | /* It's possible that we incorrectly decided a .plt reloc was |
1020 | needed for an R_X86_64_PC32 reloc to a non-function sym in | |
1021 | check_relocs. We can't decide accurately between function and | |
1022 | non-function syms in check-relocs; Objects loaded later in | |
1023 | the link may change h->type. So fix it now. */ | |
bbd7ec4a | 1024 | h->plt.offset = (bfd_vma) -1; |
70256ad8 AJ |
1025 | |
1026 | /* If this is a weak symbol, and there is a real definition, the | |
1027 | processor independent code will have arranged for us to see the | |
407443a3 | 1028 | real definition first, and we can just use the same value. */ |
70256ad8 AJ |
1029 | if (h->weakdef != NULL) |
1030 | { | |
1031 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
1032 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
1033 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
1034 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
1035 | return true; | |
1036 | } | |
1037 | ||
1038 | /* This is a reference to a symbol defined by a dynamic object which | |
407443a3 | 1039 | is not a function. */ |
70256ad8 AJ |
1040 | |
1041 | /* If we are creating a shared library, we must presume that the | |
1042 | only references to the symbol are via the global offset table. | |
1043 | For such cases we need not do anything here; the relocations will | |
407443a3 | 1044 | be handled correctly by relocate_section. */ |
70256ad8 AJ |
1045 | if (info->shared) |
1046 | return true; | |
1047 | ||
1048 | /* If there are no references to this symbol that do not use the | |
1049 | GOT, we don't need to generate a copy reloc. */ | |
1050 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) | |
1051 | return true; | |
1052 | ||
c434dee6 AJ |
1053 | /* If -z nocopyreloc was given, we won't generate them either. */ |
1054 | if (info->nocopyreloc) | |
1055 | { | |
1056 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; | |
1057 | return true; | |
1058 | } | |
1059 | ||
1060 | eh = (struct elf64_x86_64_link_hash_entry *) h; | |
1061 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
1062 | { | |
1063 | s = p->sec->output_section; | |
1064 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
1065 | break; | |
1066 | } | |
1067 | ||
1068 | /* If we didn't find any dynamic relocs in read-only sections, then | |
1069 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ | |
1070 | if (p == NULL) | |
1071 | { | |
1072 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; | |
1073 | return true; | |
1074 | } | |
1075 | ||
70256ad8 | 1076 | /* We must allocate the symbol in our .dynbss section, which will |
407443a3 | 1077 | become part of the .bss section of the executable. There will be |
70256ad8 AJ |
1078 | an entry for this symbol in the .dynsym section. The dynamic |
1079 | object will contain position independent code, so all references | |
1080 | from the dynamic object to this symbol will go through the global | |
1081 | offset table. The dynamic linker will use the .dynsym entry to | |
1082 | determine the address it must put in the global offset table, so | |
1083 | both the dynamic object and the regular object will refer to the | |
1084 | same memory location for the variable. */ | |
1085 | ||
c434dee6 | 1086 | htab = elf64_x86_64_hash_table (info); |
70256ad8 AJ |
1087 | |
1088 | /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker | |
1089 | to copy the initial value out of the dynamic object and into the | |
cedb70c5 | 1090 | runtime process image. */ |
70256ad8 AJ |
1091 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
1092 | { | |
c434dee6 | 1093 | htab->srelbss->_raw_size += sizeof (Elf64_External_Rela); |
70256ad8 AJ |
1094 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
1095 | } | |
1096 | ||
1097 | /* We need to figure out the alignment required for this symbol. I | |
407443a3 | 1098 | have no idea how ELF linkers handle this. 16-bytes is the size |
70256ad8 AJ |
1099 | of the largest type that requires hard alignment -- long double. */ |
1100 | /* FIXME: This is VERY ugly. Should be fixed for all architectures using | |
1101 | this construct. */ | |
1102 | power_of_two = bfd_log2 (h->size); | |
1103 | if (power_of_two > 4) | |
1104 | power_of_two = 4; | |
1105 | ||
1106 | /* Apply the required alignment. */ | |
c434dee6 | 1107 | s = htab->sdynbss; |
70256ad8 | 1108 | s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); |
c434dee6 | 1109 | if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) |
70256ad8 | 1110 | { |
c434dee6 | 1111 | if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) |
70256ad8 AJ |
1112 | return false; |
1113 | } | |
1114 | ||
1115 | /* Define the symbol as being at this point in the section. */ | |
1116 | h->root.u.def.section = s; | |
1117 | h->root.u.def.value = s->_raw_size; | |
1118 | ||
1119 | /* Increment the section size to make room for the symbol. */ | |
1120 | s->_raw_size += h->size; | |
1121 | ||
1122 | return true; | |
1123 | } | |
1124 | ||
c434dee6 AJ |
1125 | /* This is the condition under which elf64_x86_64_finish_dynamic_symbol |
1126 | will be called from elflink.h. If elflink.h doesn't call our | |
1127 | finish_dynamic_symbol routine, we'll need to do something about | |
1128 | initializing any .plt and .got entries in elf64_x86_64_relocate_section. */ | |
1129 | #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ | |
1130 | ((DYN) \ | |
1131 | && ((INFO)->shared \ | |
1132 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ | |
1133 | && ((H)->dynindx != -1 \ | |
1134 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) | |
1135 | ||
1136 | /* Allocate space in .plt, .got and associated reloc sections for | |
1137 | dynamic relocs. */ | |
1138 | ||
1139 | static boolean | |
1140 | allocate_dynrelocs (h, inf) | |
1141 | struct elf_link_hash_entry *h; | |
1142 | PTR inf; | |
1143 | { | |
1144 | struct bfd_link_info *info; | |
1145 | struct elf64_x86_64_link_hash_table *htab; | |
1146 | struct elf64_x86_64_link_hash_entry *eh; | |
1147 | struct elf64_x86_64_dyn_relocs *p; | |
1148 | ||
e92d460e | 1149 | if (h->root.type == bfd_link_hash_indirect) |
c434dee6 AJ |
1150 | return true; |
1151 | ||
e92d460e AM |
1152 | if (h->root.type == bfd_link_hash_warning) |
1153 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1154 | ||
c434dee6 AJ |
1155 | info = (struct bfd_link_info *) inf; |
1156 | htab = elf64_x86_64_hash_table (info); | |
1157 | ||
1158 | if (htab->elf.dynamic_sections_created | |
1159 | && h->plt.refcount > 0) | |
1160 | { | |
1161 | /* Make sure this symbol is output as a dynamic symbol. | |
1162 | Undefined weak syms won't yet be marked as dynamic. */ | |
1163 | if (h->dynindx == -1 | |
1164 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1165 | { | |
1166 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) | |
1167 | return false; | |
1168 | } | |
1169 | ||
1170 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) | |
1171 | { | |
1172 | asection *s = htab->splt; | |
1173 | ||
1174 | /* If this is the first .plt entry, make room for the special | |
1175 | first entry. */ | |
1176 | if (s->_raw_size == 0) | |
1177 | s->_raw_size += PLT_ENTRY_SIZE; | |
1178 | ||
1179 | h->plt.offset = s->_raw_size; | |
1180 | ||
1181 | /* If this symbol is not defined in a regular file, and we are | |
1182 | not generating a shared library, then set the symbol to this | |
1183 | location in the .plt. This is required to make function | |
1184 | pointers compare as equal between the normal executable and | |
1185 | the shared library. */ | |
1186 | if (! info->shared | |
1187 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1188 | { | |
1189 | h->root.u.def.section = s; | |
1190 | h->root.u.def.value = h->plt.offset; | |
1191 | } | |
1192 | ||
1193 | /* Make room for this entry. */ | |
1194 | s->_raw_size += PLT_ENTRY_SIZE; | |
1195 | ||
1196 | /* We also need to make an entry in the .got.plt section, which | |
1197 | will be placed in the .got section by the linker script. */ | |
1198 | htab->sgotplt->_raw_size += GOT_ENTRY_SIZE; | |
1199 | ||
1200 | /* We also need to make an entry in the .rela.plt section. */ | |
1201 | htab->srelplt->_raw_size += sizeof (Elf64_External_Rela); | |
1202 | } | |
1203 | else | |
1204 | { | |
1205 | h->plt.offset = (bfd_vma) -1; | |
1206 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
1207 | } | |
1208 | } | |
1209 | else | |
1210 | { | |
1211 | h->plt.offset = (bfd_vma) -1; | |
1212 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
1213 | } | |
1214 | ||
1215 | if (h->got.refcount > 0) | |
1216 | { | |
1217 | asection *s; | |
1218 | boolean dyn; | |
1219 | ||
1220 | /* Make sure this symbol is output as a dynamic symbol. | |
1221 | Undefined weak syms won't yet be marked as dynamic. */ | |
1222 | if (h->dynindx == -1 | |
1223 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1224 | { | |
1225 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) | |
1226 | return false; | |
1227 | } | |
1228 | ||
1229 | s = htab->sgot; | |
1230 | h->got.offset = s->_raw_size; | |
1231 | s->_raw_size += GOT_ENTRY_SIZE; | |
1232 | dyn = htab->elf.dynamic_sections_created; | |
1233 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) | |
1234 | htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); | |
1235 | } | |
1236 | else | |
1237 | h->got.offset = (bfd_vma) -1; | |
1238 | ||
1239 | eh = (struct elf64_x86_64_link_hash_entry *) h; | |
1240 | if (eh->dyn_relocs == NULL) | |
1241 | return true; | |
1242 | ||
1243 | /* In the shared -Bsymbolic case, discard space allocated for | |
1244 | dynamic pc-relative relocs against symbols which turn out to be | |
1245 | defined in regular objects. For the normal shared case, discard | |
1246 | space for pc-relative relocs that have become local due to symbol | |
1247 | visibility changes. */ | |
1248 | ||
1249 | if (info->shared) | |
1250 | { | |
1251 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 | |
1252 | && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 | |
1253 | || info->symbolic)) | |
1254 | { | |
1255 | struct elf64_x86_64_dyn_relocs **pp; | |
1256 | ||
1257 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
1258 | { | |
1259 | p->count -= p->pc_count; | |
1260 | p->pc_count = 0; | |
1261 | if (p->count == 0) | |
1262 | *pp = p->next; | |
1263 | else | |
1264 | pp = &p->next; | |
1265 | } | |
1266 | } | |
1267 | } | |
1268 | else | |
1269 | { | |
1270 | /* For the non-shared case, discard space for relocs against | |
1271 | symbols which turn out to need copy relocs or are not | |
1272 | dynamic. */ | |
1273 | ||
1274 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 | |
1275 | && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
1276 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1277 | || (htab->elf.dynamic_sections_created | |
1278 | && (h->root.type == bfd_link_hash_undefweak | |
1279 | || h->root.type == bfd_link_hash_undefined)))) | |
1280 | { | |
1281 | /* Make sure this symbol is output as a dynamic symbol. | |
1282 | Undefined weak syms won't yet be marked as dynamic. */ | |
1283 | if (h->dynindx == -1 | |
1284 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1285 | { | |
1286 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) | |
1287 | return false; | |
1288 | } | |
1289 | ||
1290 | /* If that succeeded, we know we'll be keeping all the | |
1291 | relocs. */ | |
1292 | if (h->dynindx != -1) | |
1293 | goto keep; | |
1294 | } | |
1295 | ||
1296 | eh->dyn_relocs = NULL; | |
1297 | ||
1298 | keep: ; | |
1299 | } | |
1300 | ||
1301 | /* Finally, allocate space. */ | |
1302 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
1303 | { | |
1304 | asection *sreloc = elf_section_data (p->sec)->sreloc; | |
1305 | sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela); | |
1306 | } | |
1307 | ||
1308 | return true; | |
1309 | } | |
1310 | ||
1311 | /* Find any dynamic relocs that apply to read-only sections. */ | |
1312 | ||
1313 | static boolean | |
1314 | readonly_dynrelocs (h, inf) | |
1315 | struct elf_link_hash_entry *h; | |
1316 | PTR inf; | |
1317 | { | |
1318 | struct elf64_x86_64_link_hash_entry *eh; | |
1319 | struct elf64_x86_64_dyn_relocs *p; | |
1320 | ||
e92d460e AM |
1321 | if (h->root.type == bfd_link_hash_warning) |
1322 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1323 | ||
c434dee6 AJ |
1324 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
1325 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
1326 | { | |
1327 | asection *s = p->sec->output_section; | |
1328 | ||
1329 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
1330 | { | |
1331 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
1332 | ||
1333 | info->flags |= DF_TEXTREL; | |
1334 | ||
1335 | /* Not an error, just cut short the traversal. */ | |
1336 | return false; | |
1337 | } | |
1338 | } | |
1339 | return true; | |
1340 | } | |
1341 | ||
70256ad8 AJ |
1342 | /* Set the sizes of the dynamic sections. */ |
1343 | ||
1344 | static boolean | |
1345 | elf64_x86_64_size_dynamic_sections (output_bfd, info) | |
8df9fc9d | 1346 | bfd *output_bfd ATTRIBUTE_UNUSED; |
70256ad8 AJ |
1347 | struct bfd_link_info *info; |
1348 | { | |
c434dee6 | 1349 | struct elf64_x86_64_link_hash_table *htab; |
70256ad8 AJ |
1350 | bfd *dynobj; |
1351 | asection *s; | |
70256ad8 | 1352 | boolean relocs; |
c434dee6 | 1353 | bfd *ibfd; |
70256ad8 | 1354 | |
c434dee6 AJ |
1355 | htab = elf64_x86_64_hash_table (info); |
1356 | dynobj = htab->elf.dynobj; | |
1357 | if (dynobj == NULL) | |
1358 | abort (); | |
70256ad8 | 1359 | |
c434dee6 | 1360 | if (htab->elf.dynamic_sections_created) |
70256ad8 AJ |
1361 | { |
1362 | /* Set the contents of the .interp section to the interpreter. */ | |
1363 | if (! info->shared) | |
1364 | { | |
1365 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
c434dee6 AJ |
1366 | if (s == NULL) |
1367 | abort (); | |
70256ad8 AJ |
1368 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
1369 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
1370 | } | |
1371 | } | |
70256ad8 | 1372 | |
c434dee6 AJ |
1373 | /* Set up .got offsets for local syms, and space for local dynamic |
1374 | relocs. */ | |
1375 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) | |
70256ad8 | 1376 | { |
c434dee6 AJ |
1377 | bfd_signed_vma *local_got; |
1378 | bfd_signed_vma *end_local_got; | |
1379 | bfd_size_type locsymcount; | |
1380 | Elf_Internal_Shdr *symtab_hdr; | |
1381 | asection *srel; | |
70256ad8 | 1382 | |
c434dee6 | 1383 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
70256ad8 AJ |
1384 | continue; |
1385 | ||
c434dee6 | 1386 | for (s = ibfd->sections; s != NULL; s = s->next) |
70256ad8 | 1387 | { |
c434dee6 AJ |
1388 | struct elf64_x86_64_dyn_relocs *p; |
1389 | ||
1390 | for (p = *((struct elf64_x86_64_dyn_relocs **) | |
1391 | &elf_section_data (s)->local_dynrel); | |
1392 | p != NULL; | |
1393 | p = p->next) | |
70256ad8 | 1394 | { |
c434dee6 AJ |
1395 | if (!bfd_is_abs_section (p->sec) |
1396 | && bfd_is_abs_section (p->sec->output_section)) | |
1397 | { | |
1398 | /* Input section has been discarded, either because | |
1399 | it is a copy of a linkonce section or due to | |
1400 | linker script /DISCARD/, so we'll be discarding | |
1401 | the relocs too. */ | |
1402 | } | |
1403 | else if (p->count != 0) | |
1404 | { | |
1405 | srel = elf_section_data (p->sec)->sreloc; | |
1406 | srel->_raw_size += p->count * sizeof (Elf64_External_Rela); | |
1407 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) | |
1408 | info->flags |= DF_TEXTREL; | |
1409 | ||
1410 | } | |
70256ad8 AJ |
1411 | } |
1412 | } | |
c434dee6 AJ |
1413 | |
1414 | local_got = elf_local_got_refcounts (ibfd); | |
1415 | if (!local_got) | |
1416 | continue; | |
1417 | ||
1418 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; | |
1419 | locsymcount = symtab_hdr->sh_info; | |
1420 | end_local_got = local_got + locsymcount; | |
1421 | s = htab->sgot; | |
1422 | srel = htab->srelgot; | |
1423 | for (; local_got < end_local_got; ++local_got) | |
70256ad8 | 1424 | { |
c434dee6 | 1425 | if (*local_got > 0) |
70256ad8 | 1426 | { |
c434dee6 AJ |
1427 | *local_got = s->_raw_size; |
1428 | s->_raw_size += GOT_ENTRY_SIZE; | |
1429 | if (info->shared) | |
1430 | srel->_raw_size += sizeof (Elf64_External_Rela); | |
70256ad8 AJ |
1431 | } |
1432 | else | |
c434dee6 AJ |
1433 | *local_got = (bfd_vma) -1; |
1434 | } | |
1435 | } | |
70256ad8 | 1436 | |
c434dee6 AJ |
1437 | /* Allocate global sym .plt and .got entries, and space for global |
1438 | sym dynamic relocs. */ | |
1439 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); | |
1440 | ||
1441 | /* We now have determined the sizes of the various dynamic sections. | |
1442 | Allocate memory for them. */ | |
1443 | relocs = false; | |
1444 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1445 | { | |
1446 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1447 | continue; | |
1448 | ||
1449 | if (s == htab->splt | |
1450 | || s == htab->sgot | |
1451 | || s == htab->sgotplt) | |
1452 | { | |
1453 | /* Strip this section if we don't need it; see the | |
1454 | comment below. */ | |
1455 | } | |
1456 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) | |
1457 | { | |
1458 | if (s->_raw_size != 0 && s != htab->srelplt) | |
1459 | relocs = true; | |
1460 | ||
1461 | /* We use the reloc_count field as a counter if we need | |
1462 | to copy relocs into the output file. */ | |
1463 | s->reloc_count = 0; | |
70256ad8 | 1464 | } |
c434dee6 | 1465 | else |
70256ad8 AJ |
1466 | { |
1467 | /* It's not one of our sections, so don't allocate space. */ | |
1468 | continue; | |
1469 | } | |
1470 | ||
c434dee6 | 1471 | if (s->_raw_size == 0) |
70256ad8 | 1472 | { |
c434dee6 AJ |
1473 | /* If we don't need this section, strip it from the |
1474 | output file. This is mostly to handle .rela.bss and | |
1475 | .rela.plt. We must create both sections in | |
1476 | create_dynamic_sections, because they must be created | |
1477 | before the linker maps input sections to output | |
1478 | sections. The linker does that before | |
1479 | adjust_dynamic_symbol is called, and it is that | |
1480 | function which decides whether anything needs to go | |
1481 | into these sections. */ | |
1482 | ||
70256ad8 AJ |
1483 | _bfd_strip_section_from_output (info, s); |
1484 | continue; | |
1485 | } | |
1486 | ||
1487 | /* Allocate memory for the section contents. We use bfd_zalloc | |
1488 | here in case unused entries are not reclaimed before the | |
1489 | section's contents are written out. This should not happen, | |
1490 | but this way if it does, we get a R_X86_64_NONE reloc instead | |
1491 | of garbage. */ | |
1492 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); | |
c434dee6 | 1493 | if (s->contents == NULL) |
70256ad8 AJ |
1494 | return false; |
1495 | } | |
1496 | ||
c434dee6 | 1497 | if (htab->elf.dynamic_sections_created) |
70256ad8 AJ |
1498 | { |
1499 | /* Add some entries to the .dynamic section. We fill in the | |
1500 | values later, in elf64_x86_64_finish_dynamic_sections, but we | |
1501 | must add the entries now so that we get the correct size for | |
407443a3 | 1502 | the .dynamic section. The DT_DEBUG entry is filled in by the |
70256ad8 | 1503 | dynamic linker and used by the debugger. */ |
dc810e39 AM |
1504 | #define add_dynamic_entry(TAG, VAL) \ |
1505 | bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) | |
1506 | ||
70256ad8 AJ |
1507 | if (! info->shared) |
1508 | { | |
dc810e39 | 1509 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
70256ad8 AJ |
1510 | return false; |
1511 | } | |
1512 | ||
c434dee6 | 1513 | if (htab->splt->_raw_size != 0) |
70256ad8 | 1514 | { |
dc810e39 AM |
1515 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
1516 | || !add_dynamic_entry (DT_PLTRELSZ, 0) | |
1517 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) | |
1518 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
70256ad8 AJ |
1519 | return false; |
1520 | } | |
1521 | ||
1522 | if (relocs) | |
1523 | { | |
dc810e39 AM |
1524 | if (!add_dynamic_entry (DT_RELA, 0) |
1525 | || !add_dynamic_entry (DT_RELASZ, 0) | |
1526 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) | |
70256ad8 | 1527 | return false; |
70256ad8 | 1528 | |
c434dee6 AJ |
1529 | /* If any dynamic relocs apply to a read-only section, |
1530 | then we need a DT_TEXTREL entry. */ | |
1531 | if ((info->flags & DF_TEXTREL) == 0) | |
1532 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, | |
1533 | (PTR) info); | |
1534 | ||
1535 | if ((info->flags & DF_TEXTREL) != 0) | |
1536 | { | |
1537 | if (!add_dynamic_entry (DT_TEXTREL, 0)) | |
1538 | return false; | |
1539 | } | |
70256ad8 AJ |
1540 | } |
1541 | } | |
dc810e39 | 1542 | #undef add_dynamic_entry |
70256ad8 AJ |
1543 | |
1544 | return true; | |
1545 | } | |
1546 | ||
8d88c4ca NC |
1547 | /* Relocate an x86_64 ELF section. */ |
1548 | ||
1549 | static boolean | |
1550 | elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, | |
fe4770f4 | 1551 | contents, relocs, local_syms, local_sections) |
8d88c4ca NC |
1552 | bfd *output_bfd; |
1553 | struct bfd_link_info *info; | |
1554 | bfd *input_bfd; | |
1555 | asection *input_section; | |
1556 | bfd_byte *contents; | |
1557 | Elf_Internal_Rela *relocs; | |
1558 | Elf_Internal_Sym *local_syms; | |
1559 | asection **local_sections; | |
1560 | { | |
c434dee6 | 1561 | struct elf64_x86_64_link_hash_table *htab; |
8d88c4ca NC |
1562 | Elf_Internal_Shdr *symtab_hdr; |
1563 | struct elf_link_hash_entry **sym_hashes; | |
1564 | bfd_vma *local_got_offsets; | |
c434dee6 | 1565 | Elf_Internal_Rela *rel; |
8d88c4ca NC |
1566 | Elf_Internal_Rela *relend; |
1567 | ||
b491616a AM |
1568 | if (info->relocateable) |
1569 | return true; | |
1570 | ||
c434dee6 | 1571 | htab = elf64_x86_64_hash_table (info); |
8d88c4ca NC |
1572 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
1573 | sym_hashes = elf_sym_hashes (input_bfd); | |
1574 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1575 | ||
c434dee6 | 1576 | rel = relocs; |
8d88c4ca | 1577 | relend = relocs + input_section->reloc_count; |
c434dee6 | 1578 | for (; rel < relend; rel++) |
8d88c4ca NC |
1579 | { |
1580 | int r_type; | |
1581 | reloc_howto_type *howto; | |
1582 | unsigned long r_symndx; | |
1583 | struct elf_link_hash_entry *h; | |
1584 | Elf_Internal_Sym *sym; | |
1585 | asection *sec; | |
c434dee6 | 1586 | bfd_vma off; |
8d88c4ca | 1587 | bfd_vma relocation; |
c434dee6 | 1588 | boolean unresolved_reloc; |
8d88c4ca | 1589 | bfd_reloc_status_type r; |
8d88c4ca | 1590 | |
c434dee6 | 1591 | r_type = ELF64_R_TYPE (rel->r_info); |
fe4770f4 AJ |
1592 | if (r_type == (int) R_X86_64_GNU_VTINHERIT |
1593 | || r_type == (int) R_X86_64_GNU_VTENTRY) | |
1594 | continue; | |
8d88c4ca | 1595 | |
c434dee6 | 1596 | if (r_type < 0 || r_type >= R_X86_64_max) |
8da6118f KH |
1597 | { |
1598 | bfd_set_error (bfd_error_bad_value); | |
1599 | return false; | |
1600 | } | |
8d88c4ca | 1601 | |
b491616a | 1602 | howto = x86_64_elf_howto_table + r_type; |
c434dee6 | 1603 | r_symndx = ELF64_R_SYM (rel->r_info); |
8d88c4ca NC |
1604 | h = NULL; |
1605 | sym = NULL; | |
1606 | sec = NULL; | |
c434dee6 | 1607 | unresolved_reloc = false; |
8d88c4ca | 1608 | if (r_symndx < symtab_hdr->sh_info) |
8da6118f KH |
1609 | { |
1610 | sym = local_syms + r_symndx; | |
1611 | sec = local_sections[r_symndx]; | |
c434dee6 AJ |
1612 | |
1613 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); | |
8da6118f | 1614 | } |
8d88c4ca | 1615 | else |
8da6118f KH |
1616 | { |
1617 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1618 | while (h->root.type == bfd_link_hash_indirect | |
1619 | || h->root.type == bfd_link_hash_warning) | |
1620 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
c434dee6 | 1621 | |
8da6118f KH |
1622 | if (h->root.type == bfd_link_hash_defined |
1623 | || h->root.type == bfd_link_hash_defweak) | |
1624 | { | |
1625 | sec = h->root.u.def.section; | |
c434dee6 | 1626 | if (sec->output_section == NULL) |
8da6118f | 1627 | { |
c434dee6 AJ |
1628 | /* Set a flag that will be cleared later if we find a |
1629 | relocation value for this symbol. output_section | |
1630 | is typically NULL for symbols satisfied by a shared | |
1631 | library. */ | |
1632 | unresolved_reloc = true; | |
8da6118f KH |
1633 | relocation = 0; |
1634 | } | |
1635 | else | |
1636 | relocation = (h->root.u.def.value | |
1637 | + sec->output_section->vma | |
1638 | + sec->output_offset); | |
1639 | } | |
1640 | else if (h->root.type == bfd_link_hash_undefweak) | |
1641 | relocation = 0; | |
671bae9c NC |
1642 | else if (info->shared |
1643 | && (!info->symbolic || info->allow_shlib_undefined) | |
1644 | && !info->no_undefined | |
70256ad8 AJ |
1645 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
1646 | relocation = 0; | |
8da6118f KH |
1647 | else |
1648 | { | |
1649 | if (! ((*info->callbacks->undefined_symbol) | |
1650 | (info, h->root.root.string, input_bfd, | |
c434dee6 | 1651 | input_section, rel->r_offset, |
8da6118f KH |
1652 | (!info->shared || info->no_undefined |
1653 | || ELF_ST_VISIBILITY (h->other))))) | |
1654 | return false; | |
1655 | relocation = 0; | |
1656 | } | |
1657 | } | |
70256ad8 AJ |
1658 | /* When generating a shared object, the relocations handled here are |
1659 | copied into the output file to be resolved at run time. */ | |
1660 | switch (r_type) | |
1661 | { | |
1662 | case R_X86_64_GOT32: | |
1663 | /* Relocation is to the entry for this symbol in the global | |
1664 | offset table. */ | |
70256ad8 AJ |
1665 | case R_X86_64_GOTPCREL: |
1666 | /* Use global offset table as symbol value. */ | |
c434dee6 AJ |
1667 | if (htab->sgot == NULL) |
1668 | abort (); | |
053579d7 | 1669 | |
51e0a107 | 1670 | if (h != NULL) |
70256ad8 | 1671 | { |
c434dee6 AJ |
1672 | boolean dyn; |
1673 | ||
1674 | off = h->got.offset; | |
1675 | dyn = htab->elf.dynamic_sections_created; | |
51e0a107 | 1676 | |
c434dee6 | 1677 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) |
51e0a107 | 1678 | || (info->shared |
c434dee6 AJ |
1679 | && (info->symbolic |
1680 | || h->dynindx == -1 | |
1681 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) | |
51e0a107 JH |
1682 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
1683 | { | |
1684 | /* This is actually a static link, or it is a -Bsymbolic | |
1685 | link and the symbol is defined locally, or the symbol | |
407443a3 | 1686 | was forced to be local because of a version file. We |
51e0a107 JH |
1687 | must initialize this entry in the global offset table. |
1688 | Since the offset must always be a multiple of 8, we | |
1689 | use the least significant bit to record whether we | |
1690 | have initialized it already. | |
1691 | ||
1692 | When doing a dynamic link, we create a .rela.got | |
407443a3 AJ |
1693 | relocation entry to initialize the value. This is |
1694 | done in the finish_dynamic_symbol routine. */ | |
51e0a107 JH |
1695 | if ((off & 1) != 0) |
1696 | off &= ~1; | |
1697 | else | |
1698 | { | |
1699 | bfd_put_64 (output_bfd, relocation, | |
c434dee6 | 1700 | htab->sgot->contents + off); |
51e0a107 JH |
1701 | h->got.offset |= 1; |
1702 | } | |
1703 | } | |
053579d7 | 1704 | else |
c434dee6 | 1705 | unresolved_reloc = false; |
70256ad8 | 1706 | } |
51e0a107 JH |
1707 | else |
1708 | { | |
c434dee6 AJ |
1709 | if (local_got_offsets == NULL) |
1710 | abort (); | |
51e0a107 JH |
1711 | |
1712 | off = local_got_offsets[r_symndx]; | |
1713 | ||
1714 | /* The offset must always be a multiple of 8. We use | |
407443a3 AJ |
1715 | the least significant bit to record whether we have |
1716 | already generated the necessary reloc. */ | |
51e0a107 JH |
1717 | if ((off & 1) != 0) |
1718 | off &= ~1; | |
1719 | else | |
1720 | { | |
c434dee6 AJ |
1721 | bfd_put_64 (output_bfd, relocation, |
1722 | htab->sgot->contents + off); | |
51e0a107 JH |
1723 | |
1724 | if (info->shared) | |
1725 | { | |
1726 | asection *srelgot; | |
1727 | Elf_Internal_Rela outrel; | |
c434dee6 | 1728 | Elf64_External_Rela *loc; |
70256ad8 | 1729 | |
51e0a107 JH |
1730 | /* We need to generate a R_X86_64_RELATIVE reloc |
1731 | for the dynamic linker. */ | |
c434dee6 AJ |
1732 | srelgot = htab->srelgot; |
1733 | if (srelgot == NULL) | |
1734 | abort (); | |
51e0a107 | 1735 | |
c434dee6 AJ |
1736 | outrel.r_offset = (htab->sgot->output_section->vma |
1737 | + htab->sgot->output_offset | |
51e0a107 JH |
1738 | + off); |
1739 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); | |
1740 | outrel.r_addend = relocation; | |
c434dee6 AJ |
1741 | loc = (Elf64_External_Rela *) srelgot->contents; |
1742 | loc += srelgot->reloc_count++; | |
1743 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
51e0a107 JH |
1744 | } |
1745 | ||
1746 | local_got_offsets[r_symndx] |= 1; | |
1747 | } | |
51e0a107 | 1748 | } |
6a2bda3f | 1749 | |
c434dee6 AJ |
1750 | if (off >= (bfd_vma) -2) |
1751 | abort (); | |
1752 | ||
1753 | relocation = htab->sgot->output_offset + off; | |
1754 | if (r_type == R_X86_64_GOTPCREL) | |
1755 | relocation += htab->sgot->output_section->vma; | |
1756 | ||
70256ad8 AJ |
1757 | break; |
1758 | ||
1759 | case R_X86_64_PLT32: | |
1760 | /* Relocation is to the entry for this symbol in the | |
1761 | procedure linkage table. */ | |
1762 | ||
1763 | /* Resolve a PLT32 reloc against a local symbol directly, | |
407443a3 | 1764 | without using the procedure linkage table. */ |
70256ad8 AJ |
1765 | if (h == NULL) |
1766 | break; | |
1767 | ||
c434dee6 AJ |
1768 | if (h->plt.offset == (bfd_vma) -1 |
1769 | || htab->splt == NULL) | |
70256ad8 AJ |
1770 | { |
1771 | /* We didn't make a PLT entry for this symbol. This | |
407443a3 AJ |
1772 | happens when statically linking PIC code, or when |
1773 | using -Bsymbolic. */ | |
70256ad8 AJ |
1774 | break; |
1775 | } | |
1776 | ||
c434dee6 AJ |
1777 | relocation = (htab->splt->output_section->vma |
1778 | + htab->splt->output_offset | |
70256ad8 | 1779 | + h->plt.offset); |
c434dee6 | 1780 | unresolved_reloc = false; |
70256ad8 AJ |
1781 | break; |
1782 | ||
fd8ab9e5 AJ |
1783 | case R_X86_64_PC8: |
1784 | case R_X86_64_PC16: | |
1785 | case R_X86_64_PC32: | |
70256ad8 AJ |
1786 | case R_X86_64_8: |
1787 | case R_X86_64_16: | |
1788 | case R_X86_64_32: | |
6b3db546 | 1789 | case R_X86_64_64: |
80643fbc | 1790 | /* FIXME: The ABI says the linker should make sure the value is |
407443a3 | 1791 | the same when it's zeroextended to 64 bit. */ |
c434dee6 AJ |
1792 | |
1793 | /* r_symndx will be zero only for relocs against symbols | |
1794 | from removed linkonce sections, or sections discarded by | |
1795 | a linker script. */ | |
1796 | if (r_symndx == 0 | |
1797 | || (input_section->flags & SEC_ALLOC) == 0) | |
1798 | break; | |
1799 | ||
1800 | if ((info->shared | |
1801 | && ((r_type != R_X86_64_PC8 | |
1802 | && r_type != R_X86_64_PC16 | |
1803 | && r_type != R_X86_64_PC32) | |
1804 | || (h != NULL | |
1805 | && h->dynindx != -1 | |
1806 | && (! info->symbolic | |
1807 | || (h->elf_link_hash_flags | |
1808 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1809 | || (!info->shared | |
1810 | && h != NULL | |
1811 | && h->dynindx != -1 | |
1812 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 | |
1813 | && (((h->elf_link_hash_flags | |
1814 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
1815 | && (h->elf_link_hash_flags | |
1816 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1817 | || h->root.type == bfd_link_hash_undefweak | |
1818 | || h->root.type == bfd_link_hash_undefined))) | |
70256ad8 AJ |
1819 | { |
1820 | Elf_Internal_Rela outrel; | |
1821 | boolean skip, relocate; | |
c434dee6 AJ |
1822 | asection *sreloc; |
1823 | Elf64_External_Rela *loc; | |
70256ad8 AJ |
1824 | |
1825 | /* When generating a shared object, these relocations | |
1826 | are copied into the output file to be resolved at run | |
407443a3 | 1827 | time. */ |
70256ad8 | 1828 | |
70256ad8 | 1829 | skip = false; |
0bb2d96a | 1830 | relocate = false; |
70256ad8 | 1831 | |
c629eae0 JJ |
1832 | outrel.r_offset = |
1833 | _bfd_elf_section_offset (output_bfd, info, input_section, | |
c434dee6 | 1834 | rel->r_offset); |
c629eae0 JJ |
1835 | if (outrel.r_offset == (bfd_vma) -1) |
1836 | skip = true; | |
0fb19cbc | 1837 | else if (outrel.r_offset == (bfd_vma) -2) |
0bb2d96a | 1838 | skip = true, relocate = true; |
70256ad8 AJ |
1839 | |
1840 | outrel.r_offset += (input_section->output_section->vma | |
1841 | + input_section->output_offset); | |
1842 | ||
1843 | if (skip) | |
0bb2d96a | 1844 | memset (&outrel, 0, sizeof outrel); |
c434dee6 | 1845 | |
fd8ab9e5 AJ |
1846 | /* h->dynindx may be -1 if this symbol was marked to |
1847 | become local. */ | |
1848 | else if (h != NULL | |
c434dee6 AJ |
1849 | && h->dynindx != -1 |
1850 | && (r_type == R_X86_64_PC8 | |
1851 | || r_type == R_X86_64_PC16 | |
1852 | || r_type == R_X86_64_PC32 | |
1853 | || !info->shared | |
1854 | || !info->symbolic | |
fd8ab9e5 AJ |
1855 | || (h->elf_link_hash_flags |
1856 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
70256ad8 | 1857 | { |
70256ad8 | 1858 | outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); |
c434dee6 | 1859 | outrel.r_addend = rel->r_addend; |
70256ad8 AJ |
1860 | } |
1861 | else | |
1862 | { | |
c434dee6 AJ |
1863 | /* This symbol is local, or marked to become local. */ |
1864 | relocate = true; | |
1865 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); | |
1866 | outrel.r_addend = relocation + rel->r_addend; | |
70256ad8 AJ |
1867 | } |
1868 | ||
c434dee6 AJ |
1869 | sreloc = elf_section_data (input_section)->sreloc; |
1870 | if (sreloc == NULL) | |
1871 | abort (); | |
1872 | ||
1873 | loc = (Elf64_External_Rela *) sreloc->contents; | |
1874 | loc += sreloc->reloc_count++; | |
1875 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); | |
70256ad8 AJ |
1876 | |
1877 | /* If this reloc is against an external symbol, we do | |
1878 | not want to fiddle with the addend. Otherwise, we | |
1879 | need to include the symbol value so that it becomes | |
1880 | an addend for the dynamic reloc. */ | |
1881 | if (! relocate) | |
1882 | continue; | |
1883 | } | |
1884 | ||
1885 | break; | |
1886 | ||
1887 | default: | |
1888 | break; | |
1889 | } | |
8d88c4ca | 1890 | |
c434dee6 AJ |
1891 | /* FIXME: Why do we allow debugging sections to escape this error? |
1892 | More importantly, why do we not emit dynamic relocs for | |
1893 | R_386_32 above in debugging sections (which are ! SEC_ALLOC)? | |
1894 | If we had emitted the dynamic reloc, we could remove the | |
1895 | fudge here. */ | |
1896 | if (unresolved_reloc | |
1897 | && !(info->shared | |
1898 | && (input_section->flags & SEC_DEBUGGING) != 0 | |
1899 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) | |
1900 | (*_bfd_error_handler) | |
1901 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), | |
1902 | bfd_archive_filename (input_bfd), | |
1903 | bfd_get_section_name (input_bfd, input_section), | |
1904 | (long) rel->r_offset, | |
1905 | h->root.root.string); | |
1906 | ||
8d88c4ca | 1907 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
c434dee6 AJ |
1908 | contents, rel->r_offset, |
1909 | relocation, rel->r_addend); | |
8d88c4ca NC |
1910 | |
1911 | if (r != bfd_reloc_ok) | |
8da6118f | 1912 | { |
c434dee6 AJ |
1913 | const char *name; |
1914 | ||
1915 | if (h != NULL) | |
1916 | name = h->root.root.string; | |
1917 | else | |
8da6118f | 1918 | { |
c434dee6 AJ |
1919 | name = bfd_elf_string_from_elf_section (input_bfd, |
1920 | symtab_hdr->sh_link, | |
1921 | sym->st_name); | |
1922 | if (name == NULL) | |
1923 | return false; | |
1924 | if (*name == '\0') | |
1925 | name = bfd_section_name (input_bfd, sec); | |
1926 | } | |
1927 | ||
1928 | if (r == bfd_reloc_overflow) | |
1929 | { | |
1930 | ||
1931 | if (! ((*info->callbacks->reloc_overflow) | |
1932 | (info, name, howto->name, (bfd_vma) 0, | |
1933 | input_bfd, input_section, rel->r_offset))) | |
1934 | return false; | |
1935 | } | |
1936 | else | |
1937 | { | |
1938 | (*_bfd_error_handler) | |
1939 | (_("%s(%s+0x%lx): reloc against `%s': error %d"), | |
1940 | bfd_archive_filename (input_bfd), | |
1941 | bfd_get_section_name (input_bfd, input_section), | |
1942 | (long) rel->r_offset, name, (int) r); | |
1943 | return false; | |
8da6118f KH |
1944 | } |
1945 | } | |
8d88c4ca | 1946 | } |
70256ad8 AJ |
1947 | |
1948 | return true; | |
1949 | } | |
1950 | ||
1951 | /* Finish up dynamic symbol handling. We set the contents of various | |
1952 | dynamic sections here. */ | |
1953 | ||
1954 | static boolean | |
1955 | elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1956 | bfd *output_bfd; | |
1957 | struct bfd_link_info *info; | |
1958 | struct elf_link_hash_entry *h; | |
1959 | Elf_Internal_Sym *sym; | |
1960 | { | |
c434dee6 | 1961 | struct elf64_x86_64_link_hash_table *htab; |
70256ad8 | 1962 | |
c434dee6 | 1963 | htab = elf64_x86_64_hash_table (info); |
70256ad8 AJ |
1964 | |
1965 | if (h->plt.offset != (bfd_vma) -1) | |
1966 | { | |
70256ad8 AJ |
1967 | bfd_vma plt_index; |
1968 | bfd_vma got_offset; | |
1969 | Elf_Internal_Rela rela; | |
c434dee6 | 1970 | Elf64_External_Rela *loc; |
70256ad8 AJ |
1971 | |
1972 | /* This symbol has an entry in the procedure linkage table. Set | |
407443a3 | 1973 | it up. */ |
70256ad8 | 1974 | |
c434dee6 AJ |
1975 | if (h->dynindx == -1 |
1976 | || htab->splt == NULL | |
1977 | || htab->sgotplt == NULL | |
1978 | || htab->srelplt == NULL) | |
1979 | abort (); | |
70256ad8 AJ |
1980 | |
1981 | /* Get the index in the procedure linkage table which | |
1982 | corresponds to this symbol. This is the index of this symbol | |
1983 | in all the symbols for which we are making plt entries. The | |
1984 | first entry in the procedure linkage table is reserved. */ | |
1985 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
1986 | ||
1987 | /* Get the offset into the .got table of the entry that | |
407443a3 | 1988 | corresponds to this function. Each .got entry is GOT_ENTRY_SIZE |
fe4770f4 | 1989 | bytes. The first three are reserved for the dynamic linker. */ |
70256ad8 AJ |
1990 | got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; |
1991 | ||
1992 | /* Fill in the entry in the procedure linkage table. */ | |
c434dee6 | 1993 | memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry, |
70256ad8 AJ |
1994 | PLT_ENTRY_SIZE); |
1995 | ||
1996 | /* Insert the relocation positions of the plt section. The magic | |
1997 | numbers at the end of the statements are the positions of the | |
1998 | relocations in the plt section. */ | |
653165cc AJ |
1999 | /* Put offset for jmp *name@GOTPCREL(%rip), since the |
2000 | instruction uses 6 bytes, subtract this value. */ | |
2001 | bfd_put_32 (output_bfd, | |
c434dee6 AJ |
2002 | (htab->sgotplt->output_section->vma |
2003 | + htab->sgotplt->output_offset | |
653165cc | 2004 | + got_offset |
c434dee6 AJ |
2005 | - htab->splt->output_section->vma |
2006 | - htab->splt->output_offset | |
653165cc AJ |
2007 | - h->plt.offset |
2008 | - 6), | |
c434dee6 | 2009 | htab->splt->contents + h->plt.offset + 2); |
653165cc AJ |
2010 | /* Put relocation index. */ |
2011 | bfd_put_32 (output_bfd, plt_index, | |
c434dee6 | 2012 | htab->splt->contents + h->plt.offset + 7); |
653165cc AJ |
2013 | /* Put offset for jmp .PLT0. */ |
2014 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), | |
c434dee6 | 2015 | htab->splt->contents + h->plt.offset + 12); |
70256ad8 | 2016 | |
653165cc AJ |
2017 | /* Fill in the entry in the global offset table, initially this |
2018 | points to the pushq instruction in the PLT which is at offset 6. */ | |
c434dee6 AJ |
2019 | bfd_put_64 (output_bfd, (htab->splt->output_section->vma |
2020 | + htab->splt->output_offset | |
70256ad8 | 2021 | + h->plt.offset + 6), |
c434dee6 | 2022 | htab->sgotplt->contents + got_offset); |
70256ad8 AJ |
2023 | |
2024 | /* Fill in the entry in the .rela.plt section. */ | |
c434dee6 AJ |
2025 | rela.r_offset = (htab->sgotplt->output_section->vma |
2026 | + htab->sgotplt->output_offset | |
70256ad8 AJ |
2027 | + got_offset); |
2028 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT); | |
2029 | rela.r_addend = 0; | |
c434dee6 AJ |
2030 | loc = (Elf64_External_Rela *) htab->srelplt->contents + plt_index; |
2031 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); | |
70256ad8 AJ |
2032 | |
2033 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2034 | { | |
2035 | /* Mark the symbol as undefined, rather than as defined in | |
c434dee6 AJ |
2036 | the .plt section. Leave the value alone. This is a clue |
2037 | for the dynamic linker, to make function pointer | |
2038 | comparisons work between an application and shared | |
2039 | library. */ | |
70256ad8 AJ |
2040 | sym->st_shndx = SHN_UNDEF; |
2041 | } | |
2042 | } | |
2043 | ||
053579d7 AJ |
2044 | if (h->got.offset != (bfd_vma) -1) |
2045 | { | |
053579d7 | 2046 | Elf_Internal_Rela rela; |
c434dee6 | 2047 | Elf64_External_Rela *loc; |
053579d7 AJ |
2048 | |
2049 | /* This symbol has an entry in the global offset table. Set it | |
2050 | up. */ | |
2051 | ||
c434dee6 AJ |
2052 | if (htab->sgot == NULL || htab->srelgot == NULL) |
2053 | abort (); | |
053579d7 | 2054 | |
c434dee6 AJ |
2055 | rela.r_offset = (htab->sgot->output_section->vma |
2056 | + htab->sgot->output_offset | |
dc810e39 | 2057 | + (h->got.offset &~ (bfd_vma) 1)); |
053579d7 AJ |
2058 | |
2059 | /* If this is a static link, or it is a -Bsymbolic link and the | |
2060 | symbol is defined locally or was forced to be local because | |
2061 | of a version file, we just want to emit a RELATIVE reloc. | |
2062 | The entry in the global offset table will already have been | |
2063 | initialized in the relocate_section function. */ | |
c434dee6 AJ |
2064 | if (info->shared |
2065 | && (info->symbolic | |
2066 | || h->dynindx == -1 | |
2067 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) | |
2068 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
053579d7 | 2069 | { |
cc78d0af | 2070 | BFD_ASSERT((h->got.offset & 1) != 0); |
053579d7 AJ |
2071 | rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
2072 | rela.r_addend = (h->root.u.def.value | |
2073 | + h->root.u.def.section->output_section->vma | |
2074 | + h->root.u.def.section->output_offset); | |
2075 | } | |
2076 | else | |
2077 | { | |
2078 | BFD_ASSERT((h->got.offset & 1) == 0); | |
c434dee6 AJ |
2079 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
2080 | htab->sgot->contents + h->got.offset); | |
053579d7 AJ |
2081 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); |
2082 | rela.r_addend = 0; | |
2083 | } | |
2084 | ||
c434dee6 AJ |
2085 | loc = (Elf64_External_Rela *) htab->srelgot->contents; |
2086 | loc += htab->srelgot->reloc_count++; | |
2087 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); | |
053579d7 AJ |
2088 | } |
2089 | ||
70256ad8 AJ |
2090 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
2091 | { | |
70256ad8 | 2092 | Elf_Internal_Rela rela; |
c434dee6 | 2093 | Elf64_External_Rela *loc; |
70256ad8 AJ |
2094 | |
2095 | /* This symbol needs a copy reloc. Set it up. */ | |
2096 | ||
c434dee6 AJ |
2097 | if (h->dynindx == -1 |
2098 | || (h->root.type != bfd_link_hash_defined | |
2099 | && h->root.type != bfd_link_hash_defweak) | |
2100 | || htab->srelbss == NULL) | |
2101 | abort (); | |
70256ad8 AJ |
2102 | |
2103 | rela.r_offset = (h->root.u.def.value | |
2104 | + h->root.u.def.section->output_section->vma | |
2105 | + h->root.u.def.section->output_offset); | |
2106 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY); | |
2107 | rela.r_addend = 0; | |
c434dee6 AJ |
2108 | loc = (Elf64_External_Rela *) htab->srelbss->contents; |
2109 | loc += htab->srelbss->reloc_count++; | |
2110 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); | |
70256ad8 AJ |
2111 | } |
2112 | ||
2113 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
2114 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
2115 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
2116 | sym->st_shndx = SHN_ABS; | |
2117 | ||
2118 | return true; | |
2119 | } | |
2120 | ||
c434dee6 AJ |
2121 | /* Used to decide how to sort relocs in an optimal manner for the |
2122 | dynamic linker, before writing them out. */ | |
2123 | ||
2124 | static enum elf_reloc_type_class | |
2125 | elf64_x86_64_reloc_type_class (rela) | |
2126 | const Elf_Internal_Rela *rela; | |
2127 | { | |
2128 | switch ((int) ELF64_R_TYPE (rela->r_info)) | |
2129 | { | |
2130 | case R_X86_64_RELATIVE: | |
2131 | return reloc_class_relative; | |
2132 | case R_X86_64_JUMP_SLOT: | |
2133 | return reloc_class_plt; | |
2134 | case R_X86_64_COPY: | |
2135 | return reloc_class_copy; | |
2136 | default: | |
2137 | return reloc_class_normal; | |
2138 | } | |
2139 | } | |
2140 | ||
70256ad8 AJ |
2141 | /* Finish up the dynamic sections. */ |
2142 | ||
2143 | static boolean | |
2144 | elf64_x86_64_finish_dynamic_sections (output_bfd, info) | |
2145 | bfd *output_bfd; | |
2146 | struct bfd_link_info *info; | |
2147 | { | |
c434dee6 | 2148 | struct elf64_x86_64_link_hash_table *htab; |
70256ad8 AJ |
2149 | bfd *dynobj; |
2150 | asection *sdyn; | |
70256ad8 | 2151 | |
c434dee6 AJ |
2152 | htab = elf64_x86_64_hash_table (info); |
2153 | dynobj = htab->elf.dynobj; | |
70256ad8 AJ |
2154 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
2155 | ||
c434dee6 | 2156 | if (htab->elf.dynamic_sections_created) |
70256ad8 | 2157 | { |
70256ad8 AJ |
2158 | Elf64_External_Dyn *dyncon, *dynconend; |
2159 | ||
c434dee6 AJ |
2160 | if (sdyn == NULL || htab->sgot == NULL) |
2161 | abort (); | |
70256ad8 AJ |
2162 | |
2163 | dyncon = (Elf64_External_Dyn *) sdyn->contents; | |
2164 | dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
2165 | for (; dyncon < dynconend; dyncon++) | |
2166 | { | |
2167 | Elf_Internal_Dyn dyn; | |
70256ad8 AJ |
2168 | asection *s; |
2169 | ||
2170 | bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); | |
2171 | ||
2172 | switch (dyn.d_tag) | |
2173 | { | |
2174 | default: | |
053579d7 | 2175 | continue; |
70256ad8 AJ |
2176 | |
2177 | case DT_PLTGOT: | |
c434dee6 AJ |
2178 | dyn.d_un.d_ptr = htab->sgot->output_section->vma; |
2179 | break; | |
70256ad8 AJ |
2180 | |
2181 | case DT_JMPREL: | |
c434dee6 AJ |
2182 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
2183 | break; | |
70256ad8 | 2184 | |
c434dee6 AJ |
2185 | case DT_PLTRELSZ: |
2186 | s = htab->srelplt->output_section; | |
2187 | if (s->_cooked_size != 0) | |
2188 | dyn.d_un.d_val = s->_cooked_size; | |
2189 | else | |
2190 | dyn.d_un.d_val = s->_raw_size; | |
70256ad8 AJ |
2191 | break; |
2192 | ||
2193 | case DT_RELASZ: | |
c434dee6 AJ |
2194 | /* The procedure linkage table relocs (DT_JMPREL) should |
2195 | not be included in the overall relocs (DT_RELA). | |
2196 | Therefore, we override the DT_RELASZ entry here to | |
2197 | make it not include the JMPREL relocs. Since the | |
2198 | linker script arranges for .rela.plt to follow all | |
2199 | other relocation sections, we don't have to worry | |
2200 | about changing the DT_RELA entry. */ | |
2201 | if (htab->srelplt != NULL) | |
70256ad8 | 2202 | { |
c434dee6 AJ |
2203 | s = htab->srelplt->output_section; |
2204 | if (s->_cooked_size != 0) | |
2205 | dyn.d_un.d_val -= s->_cooked_size; | |
2206 | else | |
2207 | dyn.d_un.d_val -= s->_raw_size; | |
70256ad8 AJ |
2208 | } |
2209 | break; | |
70256ad8 | 2210 | } |
c434dee6 | 2211 | |
70256ad8 AJ |
2212 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); |
2213 | } | |
2214 | ||
c434dee6 AJ |
2215 | /* Fill in the special first entry in the procedure linkage table. */ |
2216 | if (htab->splt && htab->splt->_raw_size > 0) | |
70256ad8 | 2217 | { |
653165cc | 2218 | /* Fill in the first entry in the procedure linkage table. */ |
c434dee6 AJ |
2219 | memcpy (htab->splt->contents, elf64_x86_64_plt0_entry, |
2220 | PLT_ENTRY_SIZE); | |
653165cc AJ |
2221 | /* Add offset for pushq GOT+8(%rip), since the instruction |
2222 | uses 6 bytes subtract this value. */ | |
2223 | bfd_put_32 (output_bfd, | |
c434dee6 AJ |
2224 | (htab->sgotplt->output_section->vma |
2225 | + htab->sgotplt->output_offset | |
653165cc | 2226 | + 8 |
c434dee6 AJ |
2227 | - htab->splt->output_section->vma |
2228 | - htab->splt->output_offset | |
653165cc | 2229 | - 6), |
c434dee6 | 2230 | htab->splt->contents + 2); |
653165cc AJ |
2231 | /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to |
2232 | the end of the instruction. */ | |
2233 | bfd_put_32 (output_bfd, | |
c434dee6 AJ |
2234 | (htab->sgotplt->output_section->vma |
2235 | + htab->sgotplt->output_offset | |
653165cc | 2236 | + 16 |
c434dee6 AJ |
2237 | - htab->splt->output_section->vma |
2238 | - htab->splt->output_offset | |
653165cc | 2239 | - 12), |
c434dee6 | 2240 | htab->splt->contents + 8); |
653165cc | 2241 | |
c434dee6 AJ |
2242 | elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize = |
2243 | PLT_ENTRY_SIZE; | |
70256ad8 | 2244 | } |
70256ad8 AJ |
2245 | } |
2246 | ||
c434dee6 | 2247 | if (htab->sgotplt) |
70256ad8 | 2248 | { |
c434dee6 AJ |
2249 | /* Fill in the first three entries in the global offset table. */ |
2250 | if (htab->sgotplt->_raw_size > 0) | |
2251 | { | |
2252 | /* Set the first entry in the global offset table to the address of | |
2253 | the dynamic section. */ | |
2254 | if (sdyn == NULL) | |
2255 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents); | |
2256 | else | |
2257 | bfd_put_64 (output_bfd, | |
2258 | sdyn->output_section->vma + sdyn->output_offset, | |
2259 | htab->sgotplt->contents); | |
2260 | /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ | |
2261 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE); | |
2262 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2); | |
2263 | } | |
70256ad8 | 2264 | |
c434dee6 AJ |
2265 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = |
2266 | GOT_ENTRY_SIZE; | |
2267 | } | |
70256ad8 | 2268 | |
8d88c4ca NC |
2269 | return true; |
2270 | } | |
2271 | ||
8df9fc9d | 2272 | |
70256ad8 AJ |
2273 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec |
2274 | #define TARGET_LITTLE_NAME "elf64-x86-64" | |
2275 | #define ELF_ARCH bfd_arch_i386 | |
2276 | #define ELF_MACHINE_CODE EM_X86_64 | |
2277 | #define ELF_MAXPAGESIZE 0x100000 | |
2278 | ||
2279 | #define elf_backend_can_gc_sections 1 | |
51b64d56 | 2280 | #define elf_backend_can_refcount 1 |
70256ad8 AJ |
2281 | #define elf_backend_want_got_plt 1 |
2282 | #define elf_backend_plt_readonly 1 | |
2283 | #define elf_backend_want_plt_sym 0 | |
2284 | #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) | |
2285 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
b491616a | 2286 | #define elf_backend_rela_normal 1 |
70256ad8 AJ |
2287 | |
2288 | #define elf_info_to_howto elf64_x86_64_info_to_howto | |
70256ad8 | 2289 | |
70256ad8 AJ |
2290 | #define bfd_elf64_bfd_link_hash_table_create \ |
2291 | elf64_x86_64_link_hash_table_create | |
407443a3 | 2292 | #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup |
70256ad8 AJ |
2293 | |
2294 | #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol | |
2295 | #define elf_backend_check_relocs elf64_x86_64_check_relocs | |
c434dee6 AJ |
2296 | #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol |
2297 | #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections | |
2298 | #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections | |
70256ad8 AJ |
2299 | #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol |
2300 | #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook | |
2301 | #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook | |
3bab7989 ML |
2302 | #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus |
2303 | #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo | |
c434dee6 | 2304 | #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class |
70256ad8 AJ |
2305 | #define elf_backend_relocate_section elf64_x86_64_relocate_section |
2306 | #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections | |
407443a3 | 2307 | #define elf_backend_object_p elf64_x86_64_elf_object_p |
8d88c4ca NC |
2308 | |
2309 | #include "elf64-target.h" |