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0afcef53 | 1 | /* x86 specific support for ELF |
250d07de | 2 | Copyright (C) 2017-2021 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 | ||
d1bcae83 L |
21 | /* Don't generate unused section symbols. */ |
22 | #define TARGET_KEEP_UNUSED_SECTION_SYMBOLS FALSE | |
23 | ||
0afcef53 L |
24 | #include "sysdep.h" |
25 | #include "bfd.h" | |
26 | #include "bfdlink.h" | |
27 | #include "libbfd.h" | |
28 | #include "elf-bfd.h" | |
0afcef53 | 29 | #include "hashtab.h" |
5b9c07b2 | 30 | #include "elf-linker-x86.h" |
0afcef53 | 31 | |
aa595247 L |
32 | #define PLT_CIE_LENGTH 20 |
33 | #define PLT_FDE_LENGTH 36 | |
34 | #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 | |
35 | #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 | |
36 | ||
765e526c L |
37 | #define ABI_64_P(abfd) \ |
38 | (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64) | |
39 | ||
0afcef53 L |
40 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
41 | copying dynamic variables from a shared lib into an app's dynbss | |
42 | section, and instead use a dynamic relocation to point into the | |
43 | shared lib. */ | |
44 | #define ELIMINATE_COPY_RELOCS 1 | |
45 | ||
46 | #define elf_x86_hash_table(p, id) \ | |
1cf58434 AM |
47 | (is_elf_hash_table ((p)->hash) \ |
48 | && elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \ | |
0afcef53 L |
49 | ? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL) |
50 | ||
6999821f L |
51 | /* Will references to this symbol always be local in this object? */ |
52 | #define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \ | |
53 | _bfd_x86_elf_link_symbol_references_local ((INFO), (H)) | |
54 | ||
99180bcc L |
55 | /* TRUE if an undefined weak symbol should be resolved to 0. Local |
56 | undefined weak symbol is always resolved to 0. Reference to an | |
57 | undefined weak symbol is resolved to 0 in executable if undefined | |
58 | weak symbol should be resolved to 0 (zero_undefweak > 0). */ | |
c5bce5c6 | 59 | #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \ |
0afcef53 | 60 | ((EH)->elf.root.type == bfd_link_hash_undefweak \ |
6999821f | 61 | && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \ |
0afcef53 | 62 | || (bfd_link_executable (INFO) \ |
98b273dc | 63 | && (EH)->zero_undefweak > 0))) |
0afcef53 L |
64 | |
65 | /* Should copy relocation be generated for a symbol. Don't generate | |
66 | copy relocation against a protected symbol defined in a shared | |
67 | object with GNU_PROPERTY_NO_COPY_ON_PROTECTED. */ | |
68 | #define SYMBOL_NO_COPYRELOC(INFO, EH) \ | |
69 | ((EH)->def_protected \ | |
70 | && ((EH)->elf.root.type == bfd_link_hash_defined \ | |
71 | || (EH)->elf.root.type == bfd_link_hash_defweak) \ | |
72 | && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \ | |
73 | && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \ | |
74 | && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0) | |
75 | ||
daf1c414 L |
76 | /* TRUE if dynamic relocation is needed. If we are creating a shared |
77 | library, and this is a reloc against a global symbol, or a non PC | |
78 | relative reloc against a local symbol, then we need to copy the reloc | |
79 | into the shared library. However, if we are linking with -Bsymbolic, | |
80 | we do not need to copy a reloc against a global symbol which is | |
81 | defined in an object we are including in the link (i.e., DEF_REGULAR | |
451875b4 L |
82 | is set). |
83 | ||
84 | If PCREL_PLT is true, don't generate dynamic relocation in PIE for | |
85 | PC-relative relocation against a dynamic function definition in data | |
86 | section when PLT address can be used. | |
daf1c414 L |
87 | |
88 | If on the other hand, we are creating an executable, we may need to | |
89 | keep relocations for symbols satisfied by a dynamic library if we | |
90 | manage to avoid copy relocs for the symbol. | |
91 | ||
92 | We also need to generate dynamic pointer relocation against | |
93 | STT_GNU_IFUNC symbol in the non-code section. */ | |
451875b4 L |
94 | #define NEED_DYNAMIC_RELOCATION_P(INFO, PCREL_PLT, H, SEC, R_TYPE, \ |
95 | POINTER_TYPE) \ | |
daf1c414 L |
96 | ((bfd_link_pic (INFO) \ |
97 | && (! X86_PCREL_TYPE_P (R_TYPE) \ | |
98 | || ((H) != NULL \ | |
99 | && (! (bfd_link_pie (INFO) \ | |
100 | || SYMBOLIC_BIND ((INFO), (H))) \ | |
101 | || (H)->root.type == bfd_link_hash_defweak \ | |
451875b4 L |
102 | || (!(bfd_link_pie (INFO) \ |
103 | && (PCREL_PLT) \ | |
104 | && (H)->plt.refcount > 0 \ | |
105 | && ((SEC)->flags & SEC_CODE) == 0 \ | |
106 | && (H)->type == STT_FUNC \ | |
107 | && (H)->def_dynamic) \ | |
108 | && !(H)->def_regular))))) \ | |
109 | || ((H) != NULL \ | |
110 | && (H)->type == STT_GNU_IFUNC \ | |
111 | && (R_TYPE) == POINTER_TYPE \ | |
112 | && ((SEC)->flags & SEC_CODE) == 0) \ | |
113 | || (ELIMINATE_COPY_RELOCS \ | |
114 | && !bfd_link_pic (INFO) \ | |
115 | && (H) != NULL \ | |
116 | && ((H)->root.type == bfd_link_hash_defweak \ | |
117 | || !(H)->def_regular))) | |
daf1c414 | 118 | |
aebcc8ff L |
119 | /* TRUE if dynamic relocation should be generated. Don't copy a |
120 | pc-relative relocation into the output file if the symbol needs | |
121 | copy reloc or the symbol is undefined when building executable. | |
122 | Copy dynamic function pointer relocations. Don't generate dynamic | |
123 | relocations against resolved undefined weak symbols in PIE, except | |
124 | when PC32_RELOC is TRUE. Undefined weak symbol is bound locally | |
382aae06 L |
125 | when PIC is false. Don't generate dynamic relocations against |
126 | non-preemptible absolute symbol. */ | |
127 | #define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, SEC, \ | |
aebcc8ff L |
128 | NEED_COPY_RELOC_IN_PIE, \ |
129 | RESOLVED_TO_ZERO, PC32_RELOC) \ | |
130 | ((bfd_link_pic (INFO) \ | |
382aae06 L |
131 | && !(bfd_is_abs_section (SEC) \ |
132 | && ((EH) == NULL \ | |
133 | || SYMBOL_REFERENCES_LOCAL (INFO, &(EH)->elf))) \ | |
aebcc8ff L |
134 | && !(NEED_COPY_RELOC_IN_PIE) \ |
135 | && ((EH) == NULL \ | |
136 | || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \ | |
137 | && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \ | |
138 | || (EH)->elf.root.type != bfd_link_hash_undefweak)) \ | |
433953ff L |
139 | && ((!X86_PCREL_TYPE_P (R_TYPE) && !X86_SIZE_TYPE_P (R_TYPE)) \ |
140 | || ! SYMBOL_CALLS_LOCAL ((INFO), \ | |
141 | (struct elf_link_hash_entry *) (EH)))) \ | |
aebcc8ff L |
142 | || (ELIMINATE_COPY_RELOCS \ |
143 | && !bfd_link_pic (INFO) \ | |
144 | && (EH) != NULL \ | |
145 | && (EH)->elf.dynindx != -1 \ | |
146 | && (!(EH)->elf.non_got_ref \ | |
aebcc8ff L |
147 | || ((EH)->elf.root.type == bfd_link_hash_undefweak \ |
148 | && !(RESOLVED_TO_ZERO))) \ | |
149 | && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \ | |
150 | || (EH)->elf.root.type == bfd_link_hash_undefined))) | |
151 | ||
e74399c4 L |
152 | /* TRUE if this input relocation should be copied to output. H->dynindx |
153 | may be -1 if this symbol was marked to become local. */ | |
154 | #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \ | |
155 | ((H) != NULL \ | |
156 | && (H)->dynindx != -1 \ | |
157 | && (X86_PCREL_TYPE_P (R_TYPE) \ | |
158 | || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \ | |
159 | || !(H)->def_regular)) | |
160 | ||
2eba97c2 L |
161 | /* TRUE if this is actually a static link, or it is a -Bsymbolic link |
162 | and the symbol is defined locally, or the symbol was forced to be | |
163 | local because of a version file. */ | |
164 | #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \ | |
165 | (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \ | |
166 | bfd_link_pic (INFO), (H)) \ | |
167 | || (bfd_link_pic (INFO) \ | |
168 | && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \ | |
169 | || (ELF_ST_VISIBILITY ((H)->other) \ | |
170 | && (H)->root.type == bfd_link_hash_undefweak)) | |
171 | ||
83924b38 L |
172 | /* TRUE if this symbol isn't defined by a shared object. */ |
173 | #define SYMBOL_DEFINED_NON_SHARED_P(H) \ | |
174 | ((H)->def_regular \ | |
175 | || (H)->root.linker_def \ | |
176 | || (H)->root.ldscript_def \ | |
4e84a8f8 | 177 | || ((struct elf_x86_link_hash_entry *) (H))->linker_def \ |
83924b38 L |
178 | || ELF_COMMON_DEF_P (H)) |
179 | ||
382aae06 L |
180 | /* Return TRUE if the symbol described by a linker hash entry H is |
181 | going to be absolute. Similar to bfd_is_abs_symbol, but excluding | |
182 | all linker-script defined symbols. */ | |
183 | #define ABS_SYMBOL_P(H) \ | |
184 | (bfd_is_abs_symbol (&(H)->root) && !(H)->root.ldscript_def) | |
185 | ||
f70656b2 L |
186 | /* TRUE if relative relocation should be generated. GOT reference to |
187 | global symbol in PIC will lead to dynamic symbol. It becomes a | |
188 | problem when "time" or "times" is defined as a variable in an | |
189 | executable, clashing with functions of the same name in libc. If a | |
190 | symbol isn't undefined weak symbol, don't make it dynamic in PIC and | |
382aae06 L |
191 | generate relative relocation. Don't generate relative relocation |
192 | against non-preemptible absolute symbol. */ | |
f70656b2 L |
193 | #define GENERATE_RELATIVE_RELOC_P(INFO, H) \ |
194 | ((H)->dynindx == -1 \ | |
195 | && !(H)->forced_local \ | |
196 | && (H)->root.type != bfd_link_hash_undefweak \ | |
382aae06 L |
197 | && bfd_link_pic (INFO) \ |
198 | && !ABS_SYMBOL_P (H)) | |
f70656b2 | 199 | |
cf1070f1 L |
200 | /* TRUE if this is a pointer reference to a local IFUNC. */ |
201 | #define POINTER_LOCAL_IFUNC_P(INFO, H) \ | |
202 | ((H)->dynindx == -1 \ | |
203 | || (H)->forced_local \ | |
204 | || bfd_link_executable (INFO)) | |
205 | ||
206 | /* TRUE if this is a PLT reference to a local IFUNC. */ | |
207 | #define PLT_LOCAL_IFUNC_P(INFO, H) \ | |
208 | ((H)->dynindx == -1 \ | |
209 | || ((bfd_link_executable (INFO) \ | |
210 | || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \ | |
211 | && (H)->def_regular \ | |
212 | && (H)->type == STT_GNU_IFUNC)) | |
213 | ||
51537393 L |
214 | /* TRUE if TLS IE->LE transition is OK. */ |
215 | #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \ | |
216 | (bfd_link_executable (INFO) \ | |
217 | && (H) != NULL \ | |
218 | && (H)->dynindx == -1 \ | |
219 | && (TLS_TYPE & GOT_TLS_IE)) | |
220 | ||
f3180fa9 L |
221 | /* Verify that the symbol has an entry in the procedure linkage table. */ |
222 | #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \ | |
e0d8f431 L |
223 | do \ |
224 | { \ | |
225 | if (((H)->dynindx == -1 \ | |
226 | && !LOCAL_UNDEFWEAK \ | |
227 | && !(((H)->forced_local || bfd_link_executable (INFO)) \ | |
228 | && (H)->def_regular \ | |
229 | && (H)->type == STT_GNU_IFUNC)) \ | |
230 | || (PLT) == NULL \ | |
231 | || (GOTPLT) == NULL \ | |
232 | || (RELPLT) == NULL) \ | |
233 | abort (); \ | |
234 | } \ | |
235 | while (0); | |
f3180fa9 | 236 | |
ff38b4cc L |
237 | /* Verify that the symbol supports copy relocation. */ |
238 | #define VERIFY_COPY_RELOC(H, HTAB) \ | |
e0d8f431 L |
239 | do \ |
240 | { \ | |
241 | if ((H)->dynindx == -1 \ | |
242 | || ((H)->root.type != bfd_link_hash_defined \ | |
243 | && (H)->root.type != bfd_link_hash_defweak) \ | |
244 | || (HTAB)->elf.srelbss == NULL \ | |
245 | || (HTAB)->elf.sreldynrelro == NULL) \ | |
246 | abort (); \ | |
247 | } \ | |
248 | while (0); | |
ff38b4cc | 249 | |
0afcef53 L |
250 | /* x86 ELF linker hash entry. */ |
251 | ||
252 | struct elf_x86_link_hash_entry | |
253 | { | |
254 | struct elf_link_hash_entry elf; | |
255 | ||
0afcef53 L |
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 | ||
442 | /* x86 ELF linker hash table. */ | |
443 | ||
444 | struct elf_x86_link_hash_table | |
445 | { | |
446 | struct elf_link_hash_table elf; | |
447 | ||
448 | /* Short-cuts to get to dynamic linker sections. */ | |
449 | asection *interp; | |
450 | asection *plt_eh_frame; | |
451 | asection *plt_second; | |
452 | asection *plt_second_eh_frame; | |
453 | asection *plt_got; | |
454 | asection *plt_got_eh_frame; | |
455 | ||
765e526c L |
456 | /* Parameters describing PLT generation, lazy or non-lazy. */ |
457 | struct elf_x86_plt_layout plt; | |
458 | ||
459 | /* Parameters describing lazy PLT generation. */ | |
460 | const struct elf_x86_lazy_plt_layout *lazy_plt; | |
461 | ||
462 | /* Parameters describing non-lazy PLT generation. */ | |
463 | const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; | |
464 | ||
0afcef53 L |
465 | union |
466 | { | |
467 | bfd_signed_vma refcount; | |
468 | bfd_vma offset; | |
469 | } tls_ld_or_ldm_got; | |
470 | ||
471 | /* The amount of space used by the jump slots in the GOT. */ | |
472 | bfd_vma sgotplt_jump_table_size; | |
473 | ||
0afcef53 L |
474 | /* _TLS_MODULE_BASE_ symbol. */ |
475 | struct bfd_link_hash_entry *tls_module_base; | |
476 | ||
477 | /* Used by local STT_GNU_IFUNC symbols. */ | |
478 | htab_t loc_hash_table; | |
479 | void * loc_hash_memory; | |
480 | ||
0afcef53 L |
481 | /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */ |
482 | bfd_vma next_jump_slot_index; | |
483 | /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */ | |
484 | bfd_vma next_irelative_index; | |
485 | ||
765e526c L |
486 | /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. |
487 | This is used for i386 only. */ | |
488 | asection *srelplt2; | |
489 | ||
490 | /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This | |
2926eb2c | 491 | is only used for i386. */ |
765e526c L |
492 | bfd_vma next_tls_desc_index; |
493 | ||
851b6fa1 L |
494 | /* Value used to fill the unused bytes of the first PLT entry. This |
495 | is only used for i386. */ | |
496 | bfd_byte plt0_pad_byte; | |
497 | ||
cd048363 L |
498 | /* TRUE if GOT is referenced. */ |
499 | unsigned int got_referenced : 1; | |
500 | ||
451875b4 L |
501 | /* TRUE if PLT is PC-relative. PLT in PDE and PC-relative PLT in PIE |
502 | can be used as function address. | |
503 | ||
504 | NB: i386 has non-PIC PLT and PIC PLT. Only non-PIC PLT in PDE can | |
505 | be used as function address. PIC PLT in PIE can't be used as | |
506 | function address. */ | |
507 | unsigned int pcrel_plt : 1; | |
508 | ||
0afcef53 L |
509 | bfd_vma (*r_info) (bfd_vma, bfd_vma); |
510 | bfd_vma (*r_sym) (bfd_vma); | |
5e2ac45d | 511 | bfd_boolean (*is_reloc_section) (const char *); |
503294e7 | 512 | unsigned int sizeof_reloc; |
9ff114ca | 513 | unsigned int got_entry_size; |
0afcef53 L |
514 | unsigned int pointer_r_type; |
515 | int dynamic_interpreter_size; | |
516 | const char *dynamic_interpreter; | |
517 | const char *tls_get_addr; | |
5b9c07b2 L |
518 | |
519 | /* Options passed from the linker. */ | |
520 | struct elf_linker_x86_params *params; | |
0afcef53 L |
521 | }; |
522 | ||
1de031c8 | 523 | struct elf_x86_init_table |
a6798bab L |
524 | { |
525 | /* The lazy PLT layout. */ | |
526 | const struct elf_x86_lazy_plt_layout *lazy_plt; | |
527 | ||
528 | /* The non-lazy PLT layout. */ | |
529 | const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; | |
530 | ||
531 | /* The lazy PLT layout for IBT. */ | |
532 | const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; | |
533 | ||
534 | /* The non-lazy PLT layout for IBT. */ | |
535 | const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; | |
536 | ||
851b6fa1 | 537 | bfd_byte plt0_pad_byte; |
7a382c1c L |
538 | |
539 | bfd_vma (*r_info) (bfd_vma, bfd_vma); | |
540 | bfd_vma (*r_sym) (bfd_vma); | |
a6798bab L |
541 | }; |
542 | ||
0afcef53 L |
543 | struct elf_x86_obj_tdata |
544 | { | |
545 | struct elf_obj_tdata root; | |
546 | ||
547 | /* tls_type for each local got entry. */ | |
548 | char *local_got_tls_type; | |
549 | ||
550 | /* GOTPLT entries for TLS descriptors. */ | |
551 | bfd_vma *local_tlsdesc_gotent; | |
552 | }; | |
553 | ||
f493882d L |
554 | enum elf_x86_plt_type |
555 | { | |
556 | plt_non_lazy = 0, | |
557 | plt_lazy = 1 << 0, | |
558 | plt_pic = 1 << 1, | |
559 | plt_second = 1 << 2, | |
560 | plt_unknown = -1 | |
561 | }; | |
562 | ||
563 | struct elf_x86_plt | |
564 | { | |
565 | const char *name; | |
566 | asection *sec; | |
567 | bfd_byte *contents; | |
568 | enum elf_x86_plt_type type; | |
569 | unsigned int plt_got_offset; | |
570 | unsigned int plt_entry_size; | |
571 | unsigned int plt_got_insn_size; /* Only used for x86-64. */ | |
572 | long count; | |
573 | }; | |
574 | ||
382aae06 L |
575 | /* Set if a relocation is converted from a GOTPCREL relocation. */ |
576 | #define R_X86_64_converted_reloc_bit (1 << 7) | |
577 | ||
0afcef53 L |
578 | #define elf_x86_tdata(abfd) \ |
579 | ((struct elf_x86_obj_tdata *) (abfd)->tdata.any) | |
580 | ||
581 | #define elf_x86_local_got_tls_type(abfd) \ | |
582 | (elf_x86_tdata (abfd)->local_got_tls_type) | |
583 | ||
584 | #define elf_x86_local_tlsdesc_gotent(abfd) \ | |
585 | (elf_x86_tdata (abfd)->local_tlsdesc_gotent) | |
586 | ||
9ff114ca L |
587 | #define elf_x86_compute_jump_table_size(htab) \ |
588 | ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size) | |
589 | ||
fe53b4a4 L |
590 | #define is_x86_elf(bfd, htab) \ |
591 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ | |
592 | && elf_tdata (bfd) != NULL \ | |
add5f777 | 593 | && elf_object_id (bfd) == (htab)->elf.hash_table_id) |
fe53b4a4 | 594 | |
39946cc2 L |
595 | extern bfd_boolean _bfd_x86_elf_mkobject |
596 | (bfd *); | |
597 | ||
0afcef53 L |
598 | extern void _bfd_x86_elf_set_tls_module_base |
599 | (struct bfd_link_info *); | |
600 | ||
601 | extern bfd_vma _bfd_x86_elf_dtpoff_base | |
602 | (struct bfd_link_info *); | |
603 | ||
604 | extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs | |
605 | (struct elf_link_hash_entry *, void *); | |
606 | ||
607 | extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash | |
608 | (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *, | |
609 | bfd_boolean); | |
610 | ||
611 | extern hashval_t _bfd_x86_elf_local_htab_hash | |
612 | (const void *); | |
613 | ||
614 | extern int _bfd_x86_elf_local_htab_eq | |
615 | (const void *, const void *); | |
616 | ||
617 | extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc | |
618 | (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); | |
619 | ||
765e526c | 620 | extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create |
0afcef53 L |
621 | (bfd *); |
622 | ||
623 | extern int _bfd_x86_elf_compare_relocs | |
624 | (const void *, const void *); | |
625 | ||
626 | extern bfd_boolean _bfd_x86_elf_link_check_relocs | |
627 | (bfd *, struct bfd_link_info *); | |
628 | ||
382aae06 L |
629 | extern bfd_boolean _bfd_elf_x86_valid_reloc_p |
630 | (asection *, struct bfd_link_info *, struct elf_x86_link_hash_table *, | |
631 | const Elf_Internal_Rela *, struct elf_link_hash_entry *, | |
632 | Elf_Internal_Sym *, Elf_Internal_Shdr *, bfd_boolean *); | |
633 | ||
5e2ac45d L |
634 | extern bfd_boolean _bfd_x86_elf_size_dynamic_sections |
635 | (bfd *, struct bfd_link_info *); | |
636 | ||
9577f60b L |
637 | extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections |
638 | (bfd *, struct bfd_link_info *); | |
639 | ||
0afcef53 L |
640 | extern bfd_boolean _bfd_x86_elf_always_size_sections |
641 | (bfd *, struct bfd_link_info *); | |
642 | ||
643 | extern void _bfd_x86_elf_merge_symbol_attribute | |
5160d0f3 | 644 | (struct elf_link_hash_entry *, unsigned int, bfd_boolean, bfd_boolean); |
0afcef53 L |
645 | |
646 | extern void _bfd_x86_elf_copy_indirect_symbol | |
647 | (struct bfd_link_info *, struct elf_link_hash_entry *, | |
648 | struct elf_link_hash_entry *); | |
649 | ||
650 | extern bfd_boolean _bfd_x86_elf_fixup_symbol | |
651 | (struct bfd_link_info *, struct elf_link_hash_entry *); | |
652 | ||
653 | extern bfd_boolean _bfd_x86_elf_hash_symbol | |
654 | (struct elf_link_hash_entry *); | |
655 | ||
eeb2f20a L |
656 | extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol |
657 | (struct bfd_link_info *, struct elf_link_hash_entry *); | |
658 | ||
9f857535 L |
659 | extern void _bfd_x86_elf_hide_symbol |
660 | (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); | |
661 | ||
6999821f L |
662 | extern bfd_boolean _bfd_x86_elf_link_symbol_references_local |
663 | (struct bfd_link_info *, struct elf_link_hash_entry *); | |
664 | ||
4f501a24 L |
665 | extern asection * _bfd_x86_elf_gc_mark_hook |
666 | (asection *, struct bfd_link_info *, Elf_Internal_Rela *, | |
667 | struct elf_link_hash_entry *, Elf_Internal_Sym *); | |
668 | ||
f493882d L |
669 | extern long _bfd_x86_elf_get_synthetic_symtab |
670 | (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **, | |
671 | asymbol **); | |
672 | ||
0afcef53 L |
673 | extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties |
674 | (bfd *, unsigned int, bfd_byte *, unsigned int); | |
675 | ||
676 | extern bfd_boolean _bfd_x86_elf_merge_gnu_properties | |
4e539114 | 677 | (struct bfd_link_info *, bfd *, bfd *, elf_property *, elf_property *); |
0afcef53 | 678 | |
bfb1e8c1 L |
679 | extern void _bfd_x86_elf_link_fixup_gnu_properties |
680 | (struct bfd_link_info *, elf_property_list **); | |
681 | ||
a6798bab | 682 | extern bfd * _bfd_x86_elf_link_setup_gnu_properties |
1de031c8 | 683 | (struct bfd_link_info *, struct elf_x86_init_table *); |
a6798bab | 684 | |
4ec09950 L |
685 | extern void _bfd_x86_elf_link_fixup_ifunc_symbol |
686 | (struct bfd_link_info *, struct elf_x86_link_hash_table *, | |
687 | struct elf_link_hash_entry *, Elf_Internal_Sym *sym); | |
688 | ||
39946cc2 L |
689 | #define bfd_elf64_mkobject \ |
690 | _bfd_x86_elf_mkobject | |
691 | #define bfd_elf32_mkobject \ | |
692 | _bfd_x86_elf_mkobject | |
765e526c L |
693 | #define bfd_elf64_bfd_link_hash_table_create \ |
694 | _bfd_x86_elf_link_hash_table_create | |
695 | #define bfd_elf32_bfd_link_hash_table_create \ | |
696 | _bfd_x86_elf_link_hash_table_create | |
0afcef53 L |
697 | #define bfd_elf64_bfd_link_check_relocs \ |
698 | _bfd_x86_elf_link_check_relocs | |
699 | #define bfd_elf32_bfd_link_check_relocs \ | |
700 | _bfd_x86_elf_link_check_relocs | |
701 | ||
5e2ac45d L |
702 | #define elf_backend_size_dynamic_sections \ |
703 | _bfd_x86_elf_size_dynamic_sections | |
0afcef53 L |
704 | #define elf_backend_always_size_sections \ |
705 | _bfd_x86_elf_always_size_sections | |
706 | #define elf_backend_merge_symbol_attribute \ | |
707 | _bfd_x86_elf_merge_symbol_attribute | |
708 | #define elf_backend_copy_indirect_symbol \ | |
709 | _bfd_x86_elf_copy_indirect_symbol | |
710 | #define elf_backend_fixup_symbol \ | |
711 | _bfd_x86_elf_fixup_symbol | |
712 | #define elf_backend_hash_symbol \ | |
713 | _bfd_x86_elf_hash_symbol | |
eeb2f20a L |
714 | #define elf_backend_adjust_dynamic_symbol \ |
715 | _bfd_x86_elf_adjust_dynamic_symbol | |
4f501a24 L |
716 | #define elf_backend_gc_mark_hook \ |
717 | _bfd_x86_elf_gc_mark_hook | |
0afcef53 | 718 | #define elf_backend_omit_section_dynsym \ |
d00dd7dc | 719 | _bfd_elf_omit_section_dynsym_all |
0afcef53 L |
720 | #define elf_backend_parse_gnu_properties \ |
721 | _bfd_x86_elf_parse_gnu_properties | |
722 | #define elf_backend_merge_gnu_properties \ | |
723 | _bfd_x86_elf_merge_gnu_properties | |
bfb1e8c1 L |
724 | #define elf_backend_fixup_gnu_properties \ |
725 | _bfd_x86_elf_link_fixup_gnu_properties |