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0afcef53 | 1 | /* x86 specific support for ELF |
b3adc24a | 2 | Copyright (C) 2017-2020 Free Software Foundation, Inc. |
0afcef53 L |
3 | |
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "bfd.h" | |
23 | #include "bfdlink.h" | |
24 | #include "libbfd.h" | |
25 | #include "elf-bfd.h" | |
0afcef53 | 26 | #include "hashtab.h" |
5b9c07b2 | 27 | #include "elf-linker-x86.h" |
0afcef53 | 28 | |
aa595247 L |
29 | #define PLT_CIE_LENGTH 20 |
30 | #define PLT_FDE_LENGTH 36 | |
31 | #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 | |
32 | #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 | |
33 | ||
765e526c L |
34 | #define ABI_64_P(abfd) \ |
35 | (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64) | |
36 | ||
0afcef53 L |
37 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
38 | copying dynamic variables from a shared lib into an app's dynbss | |
39 | section, and instead use a dynamic relocation to point into the | |
40 | shared lib. */ | |
41 | #define ELIMINATE_COPY_RELOCS 1 | |
42 | ||
43 | #define elf_x86_hash_table(p, id) \ | |
1cf58434 AM |
44 | (is_elf_hash_table ((p)->hash) \ |
45 | && elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \ | |
0afcef53 L |
46 | ? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL) |
47 | ||
6999821f L |
48 | /* Will references to this symbol always be local in this object? */ |
49 | #define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \ | |
50 | _bfd_x86_elf_link_symbol_references_local ((INFO), (H)) | |
51 | ||
99180bcc L |
52 | /* TRUE if an undefined weak symbol should be resolved to 0. Local |
53 | undefined weak symbol is always resolved to 0. Reference to an | |
54 | undefined weak symbol is resolved to 0 in executable if undefined | |
55 | weak symbol should be resolved to 0 (zero_undefweak > 0). */ | |
c5bce5c6 | 56 | #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \ |
0afcef53 | 57 | ((EH)->elf.root.type == bfd_link_hash_undefweak \ |
6999821f | 58 | && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \ |
0afcef53 | 59 | || (bfd_link_executable (INFO) \ |
98b273dc | 60 | && (EH)->zero_undefweak > 0))) |
0afcef53 L |
61 | |
62 | /* Should copy relocation be generated for a symbol. Don't generate | |
63 | copy relocation against a protected symbol defined in a shared | |
64 | object with GNU_PROPERTY_NO_COPY_ON_PROTECTED. */ | |
65 | #define SYMBOL_NO_COPYRELOC(INFO, EH) \ | |
66 | ((EH)->def_protected \ | |
67 | && ((EH)->elf.root.type == bfd_link_hash_defined \ | |
68 | || (EH)->elf.root.type == bfd_link_hash_defweak) \ | |
69 | && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \ | |
70 | && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \ | |
71 | && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0) | |
72 | ||
daf1c414 L |
73 | /* TRUE if dynamic relocation is needed. If we are creating a shared |
74 | library, and this is a reloc against a global symbol, or a non PC | |
75 | relative reloc against a local symbol, then we need to copy the reloc | |
76 | into the shared library. However, if we are linking with -Bsymbolic, | |
77 | we do not need to copy a reloc against a global symbol which is | |
78 | defined in an object we are including in the link (i.e., DEF_REGULAR | |
451875b4 L |
79 | is set). |
80 | ||
81 | If PCREL_PLT is true, don't generate dynamic relocation in PIE for | |
82 | PC-relative relocation against a dynamic function definition in data | |
83 | section when PLT address can be used. | |
daf1c414 L |
84 | |
85 | If on the other hand, we are creating an executable, we may need to | |
86 | keep relocations for symbols satisfied by a dynamic library if we | |
87 | manage to avoid copy relocs for the symbol. | |
88 | ||
89 | We also need to generate dynamic pointer relocation against | |
90 | STT_GNU_IFUNC symbol in the non-code section. */ | |
451875b4 L |
91 | #define NEED_DYNAMIC_RELOCATION_P(INFO, PCREL_PLT, H, SEC, R_TYPE, \ |
92 | POINTER_TYPE) \ | |
daf1c414 L |
93 | ((bfd_link_pic (INFO) \ |
94 | && (! X86_PCREL_TYPE_P (R_TYPE) \ | |
95 | || ((H) != NULL \ | |
96 | && (! (bfd_link_pie (INFO) \ | |
97 | || SYMBOLIC_BIND ((INFO), (H))) \ | |
98 | || (H)->root.type == bfd_link_hash_defweak \ | |
451875b4 L |
99 | || (!(bfd_link_pie (INFO) \ |
100 | && (PCREL_PLT) \ | |
101 | && (H)->plt.refcount > 0 \ | |
102 | && ((SEC)->flags & SEC_CODE) == 0 \ | |
103 | && (H)->type == STT_FUNC \ | |
104 | && (H)->def_dynamic) \ | |
105 | && !(H)->def_regular))))) \ | |
106 | || ((H) != NULL \ | |
107 | && (H)->type == STT_GNU_IFUNC \ | |
108 | && (R_TYPE) == POINTER_TYPE \ | |
109 | && ((SEC)->flags & SEC_CODE) == 0) \ | |
110 | || (ELIMINATE_COPY_RELOCS \ | |
111 | && !bfd_link_pic (INFO) \ | |
112 | && (H) != NULL \ | |
113 | && ((H)->root.type == bfd_link_hash_defweak \ | |
114 | || !(H)->def_regular))) | |
daf1c414 | 115 | |
aebcc8ff L |
116 | /* TRUE if dynamic relocation should be generated. Don't copy a |
117 | pc-relative relocation into the output file if the symbol needs | |
118 | copy reloc or the symbol is undefined when building executable. | |
119 | Copy dynamic function pointer relocations. Don't generate dynamic | |
120 | relocations against resolved undefined weak symbols in PIE, except | |
121 | when PC32_RELOC is TRUE. Undefined weak symbol is bound locally | |
382aae06 L |
122 | when PIC is false. Don't generate dynamic relocations against |
123 | non-preemptible absolute symbol. */ | |
124 | #define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, SEC, \ | |
aebcc8ff L |
125 | NEED_COPY_RELOC_IN_PIE, \ |
126 | RESOLVED_TO_ZERO, PC32_RELOC) \ | |
127 | ((bfd_link_pic (INFO) \ | |
382aae06 L |
128 | && !(bfd_is_abs_section (SEC) \ |
129 | && ((EH) == NULL \ | |
130 | || SYMBOL_REFERENCES_LOCAL (INFO, &(EH)->elf))) \ | |
aebcc8ff L |
131 | && !(NEED_COPY_RELOC_IN_PIE) \ |
132 | && ((EH) == NULL \ | |
133 | || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \ | |
134 | && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \ | |
135 | || (EH)->elf.root.type != bfd_link_hash_undefweak)) \ | |
136 | && ((!X86_PCREL_TYPE_P (R_TYPE) \ | |
137 | && !X86_SIZE_TYPE_P (R_TYPE)) \ | |
138 | || ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \ | |
139 | || (ELIMINATE_COPY_RELOCS \ | |
140 | && !bfd_link_pic (INFO) \ | |
141 | && (EH) != NULL \ | |
142 | && (EH)->elf.dynindx != -1 \ | |
143 | && (!(EH)->elf.non_got_ref \ | |
aebcc8ff L |
144 | || ((EH)->elf.root.type == bfd_link_hash_undefweak \ |
145 | && !(RESOLVED_TO_ZERO))) \ | |
146 | && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \ | |
147 | || (EH)->elf.root.type == bfd_link_hash_undefined))) | |
148 | ||
e74399c4 L |
149 | /* TRUE if this input relocation should be copied to output. H->dynindx |
150 | may be -1 if this symbol was marked to become local. */ | |
151 | #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \ | |
152 | ((H) != NULL \ | |
153 | && (H)->dynindx != -1 \ | |
154 | && (X86_PCREL_TYPE_P (R_TYPE) \ | |
155 | || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \ | |
156 | || !(H)->def_regular)) | |
157 | ||
2eba97c2 L |
158 | /* TRUE if this is actually a static link, or it is a -Bsymbolic link |
159 | and the symbol is defined locally, or the symbol was forced to be | |
160 | local because of a version file. */ | |
161 | #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \ | |
162 | (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \ | |
163 | bfd_link_pic (INFO), (H)) \ | |
164 | || (bfd_link_pic (INFO) \ | |
165 | && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \ | |
166 | || (ELF_ST_VISIBILITY ((H)->other) \ | |
167 | && (H)->root.type == bfd_link_hash_undefweak)) | |
168 | ||
83924b38 L |
169 | /* TRUE if this symbol isn't defined by a shared object. */ |
170 | #define SYMBOL_DEFINED_NON_SHARED_P(H) \ | |
171 | ((H)->def_regular \ | |
172 | || (H)->root.linker_def \ | |
173 | || (H)->root.ldscript_def \ | |
4e84a8f8 | 174 | || ((struct elf_x86_link_hash_entry *) (H))->linker_def \ |
83924b38 L |
175 | || ELF_COMMON_DEF_P (H)) |
176 | ||
382aae06 L |
177 | /* Return TRUE if the symbol described by a linker hash entry H is |
178 | going to be absolute. Similar to bfd_is_abs_symbol, but excluding | |
179 | all linker-script defined symbols. */ | |
180 | #define ABS_SYMBOL_P(H) \ | |
181 | (bfd_is_abs_symbol (&(H)->root) && !(H)->root.ldscript_def) | |
182 | ||
f70656b2 L |
183 | /* TRUE if relative relocation should be generated. GOT reference to |
184 | global symbol in PIC will lead to dynamic symbol. It becomes a | |
185 | problem when "time" or "times" is defined as a variable in an | |
186 | executable, clashing with functions of the same name in libc. If a | |
187 | symbol isn't undefined weak symbol, don't make it dynamic in PIC and | |
382aae06 L |
188 | generate relative relocation. Don't generate relative relocation |
189 | against non-preemptible absolute symbol. */ | |
f70656b2 L |
190 | #define GENERATE_RELATIVE_RELOC_P(INFO, H) \ |
191 | ((H)->dynindx == -1 \ | |
192 | && !(H)->forced_local \ | |
193 | && (H)->root.type != bfd_link_hash_undefweak \ | |
382aae06 L |
194 | && bfd_link_pic (INFO) \ |
195 | && !ABS_SYMBOL_P (H)) | |
f70656b2 | 196 | |
cf1070f1 L |
197 | /* TRUE if this is a pointer reference to a local IFUNC. */ |
198 | #define POINTER_LOCAL_IFUNC_P(INFO, H) \ | |
199 | ((H)->dynindx == -1 \ | |
200 | || (H)->forced_local \ | |
201 | || bfd_link_executable (INFO)) | |
202 | ||
203 | /* TRUE if this is a PLT reference to a local IFUNC. */ | |
204 | #define PLT_LOCAL_IFUNC_P(INFO, H) \ | |
205 | ((H)->dynindx == -1 \ | |
206 | || ((bfd_link_executable (INFO) \ | |
207 | || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \ | |
208 | && (H)->def_regular \ | |
209 | && (H)->type == STT_GNU_IFUNC)) | |
210 | ||
51537393 L |
211 | /* TRUE if TLS IE->LE transition is OK. */ |
212 | #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \ | |
213 | (bfd_link_executable (INFO) \ | |
214 | && (H) != NULL \ | |
215 | && (H)->dynindx == -1 \ | |
216 | && (TLS_TYPE & GOT_TLS_IE)) | |
217 | ||
f3180fa9 L |
218 | /* Verify that the symbol has an entry in the procedure linkage table. */ |
219 | #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \ | |
e0d8f431 L |
220 | do \ |
221 | { \ | |
222 | if (((H)->dynindx == -1 \ | |
223 | && !LOCAL_UNDEFWEAK \ | |
224 | && !(((H)->forced_local || bfd_link_executable (INFO)) \ | |
225 | && (H)->def_regular \ | |
226 | && (H)->type == STT_GNU_IFUNC)) \ | |
227 | || (PLT) == NULL \ | |
228 | || (GOTPLT) == NULL \ | |
229 | || (RELPLT) == NULL) \ | |
230 | abort (); \ | |
231 | } \ | |
232 | while (0); | |
f3180fa9 | 233 | |
ff38b4cc L |
234 | /* Verify that the symbol supports copy relocation. */ |
235 | #define VERIFY_COPY_RELOC(H, HTAB) \ | |
e0d8f431 L |
236 | do \ |
237 | { \ | |
238 | if ((H)->dynindx == -1 \ | |
239 | || ((H)->root.type != bfd_link_hash_defined \ | |
240 | && (H)->root.type != bfd_link_hash_defweak) \ | |
241 | || (HTAB)->elf.srelbss == NULL \ | |
242 | || (HTAB)->elf.sreldynrelro == NULL) \ | |
243 | abort (); \ | |
244 | } \ | |
245 | while (0); | |
ff38b4cc | 246 | |
0afcef53 L |
247 | /* x86 ELF linker hash entry. */ |
248 | ||
249 | struct elf_x86_link_hash_entry | |
250 | { | |
251 | struct elf_link_hash_entry elf; | |
252 | ||
253 | /* Track dynamic relocs copied for this symbol. */ | |
254 | struct elf_dyn_relocs *dyn_relocs; | |
255 | ||
256 | unsigned char tls_type; | |
257 | ||
98b273dc L |
258 | /* Bit 0: Symbol has no GOT nor PLT relocations. |
259 | Bit 1: Symbol has non-GOT/non-PLT relocations in text sections. | |
260 | zero_undefweak is initialized to 1 and undefined weak symbol | |
261 | should be resolved to 0 if zero_undefweak > 0. */ | |
262 | unsigned int zero_undefweak : 2; | |
0afcef53 L |
263 | |
264 | /* Don't call finish_dynamic_symbol on this symbol. */ | |
265 | unsigned int no_finish_dynamic_symbol : 1; | |
266 | ||
267 | /* TRUE if symbol is __tls_get_addr. */ | |
268 | unsigned int tls_get_addr : 1; | |
269 | ||
270 | /* TRUE if symbol is defined as a protected symbol. */ | |
271 | unsigned int def_protected : 1; | |
272 | ||
6999821f L |
273 | /* 0: Symbol references are unknown. |
274 | 1: Symbol references aren't local. | |
275 | 2: Symbol references are local. | |
276 | */ | |
277 | unsigned int local_ref : 2; | |
278 | ||
0a27fed7 L |
279 | /* TRUE if symbol is defined by linker. */ |
280 | unsigned int linker_def : 1; | |
281 | ||
f47432d4 | 282 | /* TRUE if symbol is referenced by R_386_GOTOFF relocation. This is |
c7df954f | 283 | only used by i386. */ |
0afcef53 L |
284 | unsigned int gotoff_ref : 1; |
285 | ||
286 | /* TRUE if a weak symbol with a real definition needs a copy reloc. | |
287 | When there is a weak symbol with a real definition, the processor | |
288 | independent code will have arranged for us to see the real | |
289 | definition first. We need to copy the needs_copy bit from the | |
290 | real definition and check it when allowing copy reloc in PIE. This | |
291 | is only used by x86-64. */ | |
292 | unsigned int needs_copy : 1; | |
293 | ||
0afcef53 L |
294 | /* Information about the GOT PLT entry. Filled when there are both |
295 | GOT and PLT relocations against the same function. */ | |
296 | union gotplt_union plt_got; | |
297 | ||
298 | /* Information about the second PLT entry. */ | |
299 | union gotplt_union plt_second; | |
300 | ||
301 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, | |
302 | starting at the end of the jump table. */ | |
303 | bfd_vma tlsdesc_got; | |
304 | }; | |
305 | ||
765e526c L |
306 | struct elf_x86_lazy_plt_layout |
307 | { | |
92e68c1d | 308 | /* The first entry in a lazy procedure linkage table looks like this. */ |
765e526c | 309 | const bfd_byte *plt0_entry; |
07d6d2b8 | 310 | unsigned int plt0_entry_size; /* Size of PLT0 entry. */ |
765e526c | 311 | |
92e68c1d | 312 | /* Later entries in a lazy procedure linkage table look like this. */ |
765e526c | 313 | const bfd_byte *plt_entry; |
07d6d2b8 | 314 | unsigned int plt_entry_size; /* Size of each PLT entry. */ |
765e526c | 315 | |
92e68c1d L |
316 | /* The TLSDESC entry in a lazy procedure linkage table looks like |
317 | this. This is for x86-64 only. */ | |
318 | const bfd_byte *plt_tlsdesc_entry; | |
319 | unsigned int plt_tlsdesc_entry_size; /* Size of TLSDESC entry. */ | |
320 | ||
321 | /* Offsets into the TLSDESC entry that are to be replaced with | |
322 | GOT+8 and GOT+TDG. These are for x86-64 only. */ | |
323 | unsigned int plt_tlsdesc_got1_offset; | |
324 | unsigned int plt_tlsdesc_got2_offset; | |
325 | ||
326 | /* Offset of the end of the PC-relative instructions containing | |
327 | plt_tlsdesc_got1_offset and plt_tlsdesc_got2_offset. These | |
328 | are for x86-64 only. */ | |
329 | unsigned int plt_tlsdesc_got1_insn_end; | |
330 | unsigned int plt_tlsdesc_got2_insn_end; | |
331 | ||
765e526c L |
332 | /* Offsets into plt0_entry that are to be replaced with GOT[1] and |
333 | GOT[2]. */ | |
334 | unsigned int plt0_got1_offset; | |
335 | unsigned int plt0_got2_offset; | |
336 | ||
337 | /* Offset of the end of the PC-relative instruction containing | |
338 | plt0_got2_offset. This is for x86-64 only. */ | |
339 | unsigned int plt0_got2_insn_end; | |
340 | ||
341 | /* Offsets into plt_entry that are to be replaced with... */ | |
342 | unsigned int plt_got_offset; /* ... address of this symbol in .got. */ | |
343 | unsigned int plt_reloc_offset; /* ... offset into relocation table. */ | |
344 | unsigned int plt_plt_offset; /* ... offset to start of .plt. */ | |
345 | ||
346 | /* Length of the PC-relative instruction containing plt_got_offset. | |
347 | This is used for x86-64 only. */ | |
348 | unsigned int plt_got_insn_size; | |
349 | ||
350 | /* Offset of the end of the PC-relative jump to plt0_entry. This is | |
351 | used for x86-64 only. */ | |
352 | unsigned int plt_plt_insn_end; | |
353 | ||
354 | /* Offset into plt_entry where the initial value of the GOT entry | |
355 | points. */ | |
356 | unsigned int plt_lazy_offset; | |
357 | ||
358 | /* The first entry in a PIC lazy procedure linkage table looks like | |
a6798bab | 359 | this. */ |
765e526c L |
360 | const bfd_byte *pic_plt0_entry; |
361 | ||
362 | /* Subsequent entries in a PIC lazy procedure linkage table look | |
a6798bab | 363 | like this. */ |
765e526c L |
364 | const bfd_byte *pic_plt_entry; |
365 | ||
366 | /* .eh_frame covering the lazy .plt section. */ | |
367 | const bfd_byte *eh_frame_plt; | |
368 | unsigned int eh_frame_plt_size; | |
369 | }; | |
370 | ||
371 | struct elf_x86_non_lazy_plt_layout | |
372 | { | |
92e68c1d | 373 | /* Entries in a non-lazy procedure linkage table look like this. */ |
765e526c | 374 | const bfd_byte *plt_entry; |
92e68c1d L |
375 | /* Entries in a PIC non-lazy procedure linkage table look like this. |
376 | This is only used for i386 where absolute PLT and PIC PLT are | |
377 | different. */ | |
765e526c L |
378 | const bfd_byte *pic_plt_entry; |
379 | ||
07d6d2b8 | 380 | unsigned int plt_entry_size; /* Size of each PLT entry. */ |
765e526c L |
381 | |
382 | /* Offsets into plt_entry that are to be replaced with... */ | |
383 | unsigned int plt_got_offset; /* ... address of this symbol in .got. */ | |
384 | ||
385 | /* Length of the PC-relative instruction containing plt_got_offset. | |
386 | This is used for x86-64 only. */ | |
387 | unsigned int plt_got_insn_size; | |
388 | ||
389 | /* .eh_frame covering the non-lazy .plt section. */ | |
390 | const bfd_byte *eh_frame_plt; | |
391 | unsigned int eh_frame_plt_size; | |
392 | }; | |
393 | ||
394 | struct elf_x86_plt_layout | |
395 | { | |
92e68c1d | 396 | /* The first entry in a lazy procedure linkage table looks like this. */ |
765e526c L |
397 | const bfd_byte *plt0_entry; |
398 | /* Entries in a procedure linkage table look like this. */ | |
399 | const bfd_byte *plt_entry; | |
07d6d2b8 | 400 | unsigned int plt_entry_size; /* Size of each PLT entry. */ |
765e526c L |
401 | |
402 | /* 1 has PLT0. */ | |
403 | unsigned int has_plt0; | |
404 | ||
405 | /* Offsets into plt_entry that are to be replaced with... */ | |
406 | unsigned int plt_got_offset; /* ... address of this symbol in .got. */ | |
407 | ||
408 | /* Length of the PC-relative instruction containing plt_got_offset. | |
409 | This is only used for x86-64. */ | |
410 | unsigned int plt_got_insn_size; | |
411 | ||
b44ee3a8 L |
412 | /* Alignment of the .iplt section. */ |
413 | unsigned int iplt_alignment; | |
414 | ||
765e526c L |
415 | /* .eh_frame covering the .plt section. */ |
416 | const bfd_byte *eh_frame_plt; | |
417 | unsigned int eh_frame_plt_size; | |
418 | }; | |
419 | ||
6b9553e2 | 420 | /* Values in tls_type of x86 ELF linker hash entry. */ |
0afcef53 L |
421 | #define GOT_UNKNOWN 0 |
422 | #define GOT_NORMAL 1 | |
423 | #define GOT_TLS_GD 2 | |
6b9553e2 L |
424 | #define GOT_TLS_IE 4 |
425 | #define GOT_TLS_IE_POS 5 | |
426 | #define GOT_TLS_IE_NEG 6 | |
427 | #define GOT_TLS_IE_BOTH 7 | |
428 | #define GOT_TLS_GDESC 8 | |
382aae06 | 429 | #define GOT_ABS 9 |
6b9553e2 L |
430 | #define GOT_TLS_GD_BOTH_P(type) \ |
431 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) | |
432 | #define GOT_TLS_GD_P(type) \ | |
433 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) | |
434 | #define GOT_TLS_GDESC_P(type) \ | |
435 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) | |
436 | #define GOT_TLS_GD_ANY_P(type) \ | |
437 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) | |
0afcef53 L |
438 | |
439 | #define elf_x86_hash_entry(ent) \ | |
440 | ((struct elf_x86_link_hash_entry *)(ent)) | |
441 | ||
851b6fa1 L |
442 | enum elf_x86_target_os |
443 | { | |
444 | is_normal, | |
3b4c3844 | 445 | is_solaris, |
851b6fa1 L |
446 | is_vxworks, |
447 | is_nacl | |
448 | }; | |
449 | ||
0afcef53 L |
450 | /* x86 ELF linker hash table. */ |
451 | ||
452 | struct elf_x86_link_hash_table | |
453 | { | |
454 | struct elf_link_hash_table elf; | |
455 | ||
456 | /* Short-cuts to get to dynamic linker sections. */ | |
457 | asection *interp; | |
458 | asection *plt_eh_frame; | |
459 | asection *plt_second; | |
460 | asection *plt_second_eh_frame; | |
461 | asection *plt_got; | |
462 | asection *plt_got_eh_frame; | |
463 | ||
765e526c L |
464 | /* Parameters describing PLT generation, lazy or non-lazy. */ |
465 | struct elf_x86_plt_layout plt; | |
466 | ||
467 | /* Parameters describing lazy PLT generation. */ | |
468 | const struct elf_x86_lazy_plt_layout *lazy_plt; | |
469 | ||
470 | /* Parameters describing non-lazy PLT generation. */ | |
471 | const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; | |
472 | ||
0afcef53 L |
473 | union |
474 | { | |
475 | bfd_signed_vma refcount; | |
476 | bfd_vma offset; | |
477 | } tls_ld_or_ldm_got; | |
478 | ||
479 | /* The amount of space used by the jump slots in the GOT. */ | |
480 | bfd_vma sgotplt_jump_table_size; | |
481 | ||
482 | /* Small local sym cache. */ | |
483 | struct sym_cache sym_cache; | |
484 | ||
485 | /* _TLS_MODULE_BASE_ symbol. */ | |
486 | struct bfd_link_hash_entry *tls_module_base; | |
487 | ||
488 | /* Used by local STT_GNU_IFUNC symbols. */ | |
489 | htab_t loc_hash_table; | |
490 | void * loc_hash_memory; | |
491 | ||
0afcef53 L |
492 | /* The offset into sgot of the GOT entry used by the PLT entry |
493 | above. */ | |
494 | bfd_vma tlsdesc_got; | |
495 | ||
496 | /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */ | |
497 | bfd_vma next_jump_slot_index; | |
498 | /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */ | |
499 | bfd_vma next_irelative_index; | |
500 | ||
501 | /* TRUE if there are dynamic relocs against IFUNC symbols that apply | |
502 | to read-only sections. */ | |
503 | bfd_boolean readonly_dynrelocs_against_ifunc; | |
504 | ||
765e526c L |
505 | /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. |
506 | This is used for i386 only. */ | |
507 | asection *srelplt2; | |
508 | ||
509 | /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This | |
2926eb2c | 510 | is only used for i386. */ |
765e526c L |
511 | bfd_vma next_tls_desc_index; |
512 | ||
2926eb2c L |
513 | /* The offset into splt of the PLT entry for the TLS descriptor |
514 | resolver. Special values are 0, if not necessary (or not found | |
515 | to be necessary yet), and -1 if needed but not determined | |
516 | yet. This is only used for x86-64. */ | |
517 | bfd_vma tlsdesc_plt; | |
518 | ||
851b6fa1 L |
519 | /* Value used to fill the unused bytes of the first PLT entry. This |
520 | is only used for i386. */ | |
521 | bfd_byte plt0_pad_byte; | |
522 | ||
cd048363 L |
523 | /* TRUE if GOT is referenced. */ |
524 | unsigned int got_referenced : 1; | |
525 | ||
451875b4 L |
526 | /* TRUE if PLT is PC-relative. PLT in PDE and PC-relative PLT in PIE |
527 | can be used as function address. | |
528 | ||
529 | NB: i386 has non-PIC PLT and PIC PLT. Only non-PIC PLT in PDE can | |
530 | be used as function address. PIC PLT in PIE can't be used as | |
531 | function address. */ | |
532 | unsigned int pcrel_plt : 1; | |
533 | ||
0afcef53 L |
534 | bfd_vma (*r_info) (bfd_vma, bfd_vma); |
535 | bfd_vma (*r_sym) (bfd_vma); | |
5e2ac45d | 536 | bfd_boolean (*is_reloc_section) (const char *); |
fe53b4a4 | 537 | enum elf_target_id target_id; |
851b6fa1 | 538 | enum elf_x86_target_os target_os; |
503294e7 | 539 | unsigned int sizeof_reloc; |
5e2ac45d L |
540 | unsigned int dt_reloc; |
541 | unsigned int dt_reloc_sz; | |
542 | unsigned int dt_reloc_ent; | |
9ff114ca | 543 | unsigned int got_entry_size; |
0afcef53 L |
544 | unsigned int pointer_r_type; |
545 | int dynamic_interpreter_size; | |
546 | const char *dynamic_interpreter; | |
547 | const char *tls_get_addr; | |
5b9c07b2 L |
548 | |
549 | /* Options passed from the linker. */ | |
550 | struct elf_linker_x86_params *params; | |
0afcef53 L |
551 | }; |
552 | ||
851b6fa1 L |
553 | /* Architecture-specific backend data for x86. */ |
554 | ||
555 | struct elf_x86_backend_data | |
556 | { | |
557 | /* Target system. */ | |
558 | enum elf_x86_target_os target_os; | |
559 | }; | |
560 | ||
561 | #define get_elf_x86_backend_data(abfd) \ | |
562 | ((const struct elf_x86_backend_data *) \ | |
563 | get_elf_backend_data (abfd)->arch_data) | |
564 | ||
1de031c8 | 565 | struct elf_x86_init_table |
a6798bab L |
566 | { |
567 | /* The lazy PLT layout. */ | |
568 | const struct elf_x86_lazy_plt_layout *lazy_plt; | |
569 | ||
570 | /* The non-lazy PLT layout. */ | |
571 | const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; | |
572 | ||
573 | /* The lazy PLT layout for IBT. */ | |
574 | const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; | |
575 | ||
576 | /* The non-lazy PLT layout for IBT. */ | |
577 | const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; | |
578 | ||
851b6fa1 | 579 | bfd_byte plt0_pad_byte; |
7a382c1c L |
580 | |
581 | bfd_vma (*r_info) (bfd_vma, bfd_vma); | |
582 | bfd_vma (*r_sym) (bfd_vma); | |
a6798bab L |
583 | }; |
584 | ||
0afcef53 L |
585 | struct elf_x86_obj_tdata |
586 | { | |
587 | struct elf_obj_tdata root; | |
588 | ||
589 | /* tls_type for each local got entry. */ | |
590 | char *local_got_tls_type; | |
591 | ||
592 | /* GOTPLT entries for TLS descriptors. */ | |
593 | bfd_vma *local_tlsdesc_gotent; | |
594 | }; | |
595 | ||
f493882d L |
596 | enum elf_x86_plt_type |
597 | { | |
598 | plt_non_lazy = 0, | |
599 | plt_lazy = 1 << 0, | |
600 | plt_pic = 1 << 1, | |
601 | plt_second = 1 << 2, | |
602 | plt_unknown = -1 | |
603 | }; | |
604 | ||
605 | struct elf_x86_plt | |
606 | { | |
607 | const char *name; | |
608 | asection *sec; | |
609 | bfd_byte *contents; | |
610 | enum elf_x86_plt_type type; | |
611 | unsigned int plt_got_offset; | |
612 | unsigned int plt_entry_size; | |
613 | unsigned int plt_got_insn_size; /* Only used for x86-64. */ | |
614 | long count; | |
615 | }; | |
616 | ||
382aae06 L |
617 | /* Set if a relocation is converted from a GOTPCREL relocation. */ |
618 | #define R_X86_64_converted_reloc_bit (1 << 7) | |
619 | ||
0afcef53 L |
620 | #define elf_x86_tdata(abfd) \ |
621 | ((struct elf_x86_obj_tdata *) (abfd)->tdata.any) | |
622 | ||
623 | #define elf_x86_local_got_tls_type(abfd) \ | |
624 | (elf_x86_tdata (abfd)->local_got_tls_type) | |
625 | ||
626 | #define elf_x86_local_tlsdesc_gotent(abfd) \ | |
627 | (elf_x86_tdata (abfd)->local_tlsdesc_gotent) | |
628 | ||
9ff114ca L |
629 | #define elf_x86_compute_jump_table_size(htab) \ |
630 | ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size) | |
631 | ||
fe53b4a4 L |
632 | #define is_x86_elf(bfd, htab) \ |
633 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ | |
634 | && elf_tdata (bfd) != NULL \ | |
635 | && elf_object_id (bfd) == (htab)->target_id) | |
636 | ||
39946cc2 L |
637 | extern bfd_boolean _bfd_x86_elf_mkobject |
638 | (bfd *); | |
639 | ||
0afcef53 L |
640 | extern void _bfd_x86_elf_set_tls_module_base |
641 | (struct bfd_link_info *); | |
642 | ||
643 | extern bfd_vma _bfd_x86_elf_dtpoff_base | |
644 | (struct bfd_link_info *); | |
645 | ||
646 | extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs | |
647 | (struct elf_link_hash_entry *, void *); | |
648 | ||
649 | extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash | |
650 | (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *, | |
651 | bfd_boolean); | |
652 | ||
653 | extern hashval_t _bfd_x86_elf_local_htab_hash | |
654 | (const void *); | |
655 | ||
656 | extern int _bfd_x86_elf_local_htab_eq | |
657 | (const void *, const void *); | |
658 | ||
659 | extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc | |
660 | (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); | |
661 | ||
765e526c | 662 | extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create |
0afcef53 L |
663 | (bfd *); |
664 | ||
665 | extern int _bfd_x86_elf_compare_relocs | |
666 | (const void *, const void *); | |
667 | ||
668 | extern bfd_boolean _bfd_x86_elf_link_check_relocs | |
669 | (bfd *, struct bfd_link_info *); | |
670 | ||
382aae06 L |
671 | extern bfd_boolean _bfd_elf_x86_valid_reloc_p |
672 | (asection *, struct bfd_link_info *, struct elf_x86_link_hash_table *, | |
673 | const Elf_Internal_Rela *, struct elf_link_hash_entry *, | |
674 | Elf_Internal_Sym *, Elf_Internal_Shdr *, bfd_boolean *); | |
675 | ||
5e2ac45d L |
676 | extern bfd_boolean _bfd_x86_elf_size_dynamic_sections |
677 | (bfd *, struct bfd_link_info *); | |
678 | ||
9577f60b L |
679 | extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections |
680 | (bfd *, struct bfd_link_info *); | |
681 | ||
0afcef53 L |
682 | extern bfd_boolean _bfd_x86_elf_always_size_sections |
683 | (bfd *, struct bfd_link_info *); | |
684 | ||
685 | extern void _bfd_x86_elf_merge_symbol_attribute | |
686 | (struct elf_link_hash_entry *, const Elf_Internal_Sym *, | |
687 | bfd_boolean, bfd_boolean); | |
688 | ||
689 | extern void _bfd_x86_elf_copy_indirect_symbol | |
690 | (struct bfd_link_info *, struct elf_link_hash_entry *, | |
691 | struct elf_link_hash_entry *); | |
692 | ||
693 | extern bfd_boolean _bfd_x86_elf_fixup_symbol | |
694 | (struct bfd_link_info *, struct elf_link_hash_entry *); | |
695 | ||
696 | extern bfd_boolean _bfd_x86_elf_hash_symbol | |
697 | (struct elf_link_hash_entry *); | |
698 | ||
eeb2f20a L |
699 | extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol |
700 | (struct bfd_link_info *, struct elf_link_hash_entry *); | |
701 | ||
9f857535 L |
702 | extern void _bfd_x86_elf_hide_symbol |
703 | (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); | |
704 | ||
6999821f L |
705 | extern bfd_boolean _bfd_x86_elf_link_symbol_references_local |
706 | (struct bfd_link_info *, struct elf_link_hash_entry *); | |
707 | ||
4f501a24 L |
708 | extern asection * _bfd_x86_elf_gc_mark_hook |
709 | (asection *, struct bfd_link_info *, Elf_Internal_Rela *, | |
710 | struct elf_link_hash_entry *, Elf_Internal_Sym *); | |
711 | ||
f493882d L |
712 | extern long _bfd_x86_elf_get_synthetic_symtab |
713 | (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **, | |
714 | asymbol **); | |
715 | ||
0afcef53 L |
716 | extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties |
717 | (bfd *, unsigned int, bfd_byte *, unsigned int); | |
718 | ||
719 | extern bfd_boolean _bfd_x86_elf_merge_gnu_properties | |
4e539114 | 720 | (struct bfd_link_info *, bfd *, bfd *, elf_property *, elf_property *); |
0afcef53 | 721 | |
bfb1e8c1 L |
722 | extern void _bfd_x86_elf_link_fixup_gnu_properties |
723 | (struct bfd_link_info *, elf_property_list **); | |
724 | ||
a6798bab | 725 | extern bfd * _bfd_x86_elf_link_setup_gnu_properties |
1de031c8 | 726 | (struct bfd_link_info *, struct elf_x86_init_table *); |
a6798bab | 727 | |
4ec09950 L |
728 | extern void _bfd_x86_elf_link_fixup_ifunc_symbol |
729 | (struct bfd_link_info *, struct elf_x86_link_hash_table *, | |
730 | struct elf_link_hash_entry *, Elf_Internal_Sym *sym); | |
731 | ||
39946cc2 L |
732 | #define bfd_elf64_mkobject \ |
733 | _bfd_x86_elf_mkobject | |
734 | #define bfd_elf32_mkobject \ | |
735 | _bfd_x86_elf_mkobject | |
765e526c L |
736 | #define bfd_elf64_bfd_link_hash_table_create \ |
737 | _bfd_x86_elf_link_hash_table_create | |
738 | #define bfd_elf32_bfd_link_hash_table_create \ | |
739 | _bfd_x86_elf_link_hash_table_create | |
0afcef53 L |
740 | #define bfd_elf64_bfd_link_check_relocs \ |
741 | _bfd_x86_elf_link_check_relocs | |
742 | #define bfd_elf32_bfd_link_check_relocs \ | |
743 | _bfd_x86_elf_link_check_relocs | |
744 | ||
5e2ac45d L |
745 | #define elf_backend_size_dynamic_sections \ |
746 | _bfd_x86_elf_size_dynamic_sections | |
0afcef53 L |
747 | #define elf_backend_always_size_sections \ |
748 | _bfd_x86_elf_always_size_sections | |
749 | #define elf_backend_merge_symbol_attribute \ | |
750 | _bfd_x86_elf_merge_symbol_attribute | |
751 | #define elf_backend_copy_indirect_symbol \ | |
752 | _bfd_x86_elf_copy_indirect_symbol | |
753 | #define elf_backend_fixup_symbol \ | |
754 | _bfd_x86_elf_fixup_symbol | |
755 | #define elf_backend_hash_symbol \ | |
756 | _bfd_x86_elf_hash_symbol | |
eeb2f20a L |
757 | #define elf_backend_adjust_dynamic_symbol \ |
758 | _bfd_x86_elf_adjust_dynamic_symbol | |
4f501a24 L |
759 | #define elf_backend_gc_mark_hook \ |
760 | _bfd_x86_elf_gc_mark_hook | |
0afcef53 | 761 | #define elf_backend_omit_section_dynsym \ |
d00dd7dc | 762 | _bfd_elf_omit_section_dynsym_all |
0afcef53 L |
763 | #define elf_backend_parse_gnu_properties \ |
764 | _bfd_x86_elf_parse_gnu_properties | |
765 | #define elf_backend_merge_gnu_properties \ | |
766 | _bfd_x86_elf_merge_gnu_properties | |
bfb1e8c1 L |
767 | #define elf_backend_fixup_gnu_properties \ |
768 | _bfd_x86_elf_link_fixup_gnu_properties |