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Commit | Line | Data |
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65765700 | 1 | /* .eh_frame section optimization. |
fd67aa11 | 2 | Copyright (C) 2001-2024 Free Software Foundation, Inc. |
65765700 JJ |
3 | Written by Jakub Jelinek <jakub@redhat.com>. |
4 | ||
5ed6aba4 | 5 | This file is part of BFD, the Binary File Descriptor library. |
65765700 | 6 | |
5ed6aba4 NC |
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 | |
cd123cb7 | 9 | the Free Software Foundation; either version 3 of the License, or |
5ed6aba4 | 10 | (at your option) any later version. |
65765700 | 11 | |
5ed6aba4 NC |
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. | |
65765700 | 16 | |
5ed6aba4 NC |
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 | |
cd123cb7 NC |
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
20 | MA 02110-1301, USA. */ | |
65765700 | 21 | |
65765700 | 22 | #include "sysdep.h" |
3db64b00 | 23 | #include "bfd.h" |
65765700 JJ |
24 | #include "libbfd.h" |
25 | #include "elf-bfd.h" | |
fa8f86ff | 26 | #include "dwarf2.h" |
65765700 JJ |
27 | |
28 | #define EH_FRAME_HDR_SIZE 8 | |
29 | ||
bce613b9 JJ |
30 | struct cie |
31 | { | |
32 | unsigned int length; | |
33 | unsigned int hash; | |
34 | unsigned char version; | |
f137a54e | 35 | unsigned char local_personality; |
bce613b9 JJ |
36 | char augmentation[20]; |
37 | bfd_vma code_align; | |
38 | bfd_signed_vma data_align; | |
39 | bfd_vma ra_column; | |
40 | bfd_vma augmentation_size; | |
f137a54e AM |
41 | union { |
42 | struct elf_link_hash_entry *h; | |
5087d529 AM |
43 | struct { |
44 | unsigned int bfd_id; | |
45 | unsigned int index; | |
46 | } sym; | |
184d07da | 47 | unsigned int reloc_index; |
f137a54e | 48 | } personality; |
bce613b9 JJ |
49 | struct eh_cie_fde *cie_inf; |
50 | unsigned char per_encoding; | |
51 | unsigned char lsda_encoding; | |
52 | unsigned char fde_encoding; | |
53 | unsigned char initial_insn_length; | |
9f4b847e | 54 | unsigned char can_make_lsda_relative; |
bce613b9 JJ |
55 | unsigned char initial_instructions[50]; |
56 | }; | |
57 | ||
58 | ||
59 | ||
2c42be65 RS |
60 | /* If *ITER hasn't reached END yet, read the next byte into *RESULT and |
61 | move onto the next byte. Return true on success. */ | |
62 | ||
0a1b45a2 | 63 | static inline bool |
2c42be65 RS |
64 | read_byte (bfd_byte **iter, bfd_byte *end, unsigned char *result) |
65 | { | |
66 | if (*iter >= end) | |
0a1b45a2 | 67 | return false; |
2c42be65 | 68 | *result = *((*iter)++); |
0a1b45a2 | 69 | return true; |
2c42be65 RS |
70 | } |
71 | ||
72 | /* Move *ITER over LENGTH bytes, or up to END, whichever is closer. | |
73 | Return true it was possible to move LENGTH bytes. */ | |
74 | ||
0a1b45a2 | 75 | static inline bool |
2c42be65 RS |
76 | skip_bytes (bfd_byte **iter, bfd_byte *end, bfd_size_type length) |
77 | { | |
78 | if ((bfd_size_type) (end - *iter) < length) | |
79 | { | |
80 | *iter = end; | |
0a1b45a2 | 81 | return false; |
2c42be65 RS |
82 | } |
83 | *iter += length; | |
0a1b45a2 | 84 | return true; |
2c42be65 RS |
85 | } |
86 | ||
87 | /* Move *ITER over an leb128, stopping at END. Return true if the end | |
88 | of the leb128 was found. */ | |
89 | ||
0a1b45a2 | 90 | static bool |
2c42be65 RS |
91 | skip_leb128 (bfd_byte **iter, bfd_byte *end) |
92 | { | |
93 | unsigned char byte; | |
94 | do | |
95 | if (!read_byte (iter, end, &byte)) | |
0a1b45a2 | 96 | return false; |
2c42be65 | 97 | while (byte & 0x80); |
0a1b45a2 | 98 | return true; |
2c42be65 RS |
99 | } |
100 | ||
101 | /* Like skip_leb128, but treat the leb128 as an unsigned value and | |
102 | store it in *VALUE. */ | |
103 | ||
0a1b45a2 | 104 | static bool |
2c42be65 RS |
105 | read_uleb128 (bfd_byte **iter, bfd_byte *end, bfd_vma *value) |
106 | { | |
107 | bfd_byte *start, *p; | |
108 | ||
109 | start = *iter; | |
110 | if (!skip_leb128 (iter, end)) | |
0a1b45a2 | 111 | return false; |
2c42be65 RS |
112 | |
113 | p = *iter; | |
114 | *value = *--p; | |
115 | while (p > start) | |
116 | *value = (*value << 7) | (*--p & 0x7f); | |
117 | ||
0a1b45a2 | 118 | return true; |
2c42be65 RS |
119 | } |
120 | ||
121 | /* Like read_uleb128, but for signed values. */ | |
122 | ||
0a1b45a2 | 123 | static bool |
2c42be65 RS |
124 | read_sleb128 (bfd_byte **iter, bfd_byte *end, bfd_signed_vma *value) |
125 | { | |
126 | bfd_byte *start, *p; | |
127 | ||
128 | start = *iter; | |
129 | if (!skip_leb128 (iter, end)) | |
0a1b45a2 | 130 | return false; |
2c42be65 RS |
131 | |
132 | p = *iter; | |
133 | *value = ((*--p & 0x7f) ^ 0x40) - 0x40; | |
134 | while (p > start) | |
135 | *value = (*value << 7) | (*--p & 0x7f); | |
136 | ||
0a1b45a2 | 137 | return true; |
2c42be65 | 138 | } |
65765700 JJ |
139 | |
140 | /* Return 0 if either encoding is variable width, or not yet known to bfd. */ | |
141 | ||
142 | static | |
c39a58e6 | 143 | int get_DW_EH_PE_width (int encoding, int ptr_size) |
65765700 JJ |
144 | { |
145 | /* DW_EH_PE_ values of 0x60 and 0x70 weren't defined at the time .eh_frame | |
146 | was added to bfd. */ | |
147 | if ((encoding & 0x60) == 0x60) | |
148 | return 0; | |
149 | ||
150 | switch (encoding & 7) | |
151 | { | |
152 | case DW_EH_PE_udata2: return 2; | |
153 | case DW_EH_PE_udata4: return 4; | |
154 | case DW_EH_PE_udata8: return 8; | |
155 | case DW_EH_PE_absptr: return ptr_size; | |
156 | default: | |
157 | break; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
84f97cb6 AS |
163 | #define get_DW_EH_PE_signed(encoding) (((encoding) & DW_EH_PE_signed) != 0) |
164 | ||
9e2a4898 JJ |
165 | /* Read a width sized value from memory. */ |
166 | ||
167 | static bfd_vma | |
c39a58e6 | 168 | read_value (bfd *abfd, bfd_byte *buf, int width, int is_signed) |
9e2a4898 JJ |
169 | { |
170 | bfd_vma value; | |
171 | ||
172 | switch (width) | |
173 | { | |
84f97cb6 AS |
174 | case 2: |
175 | if (is_signed) | |
176 | value = bfd_get_signed_16 (abfd, buf); | |
177 | else | |
178 | value = bfd_get_16 (abfd, buf); | |
179 | break; | |
180 | case 4: | |
181 | if (is_signed) | |
182 | value = bfd_get_signed_32 (abfd, buf); | |
183 | else | |
184 | value = bfd_get_32 (abfd, buf); | |
185 | break; | |
186 | case 8: | |
187 | if (is_signed) | |
188 | value = bfd_get_signed_64 (abfd, buf); | |
189 | else | |
190 | value = bfd_get_64 (abfd, buf); | |
191 | break; | |
192 | default: | |
193 | BFD_FAIL (); | |
194 | return 0; | |
9e2a4898 JJ |
195 | } |
196 | ||
197 | return value; | |
198 | } | |
b34976b6 | 199 | |
9e2a4898 JJ |
200 | /* Store a width sized value to memory. */ |
201 | ||
202 | static void | |
c39a58e6 | 203 | write_value (bfd *abfd, bfd_byte *buf, bfd_vma value, int width) |
9e2a4898 JJ |
204 | { |
205 | switch (width) | |
206 | { | |
207 | case 2: bfd_put_16 (abfd, value, buf); break; | |
208 | case 4: bfd_put_32 (abfd, value, buf); break; | |
209 | case 8: bfd_put_64 (abfd, value, buf); break; | |
210 | default: BFD_FAIL (); | |
211 | } | |
212 | } | |
213 | ||
bce613b9 | 214 | /* Return one if C1 and C2 CIEs can be merged. */ |
65765700 | 215 | |
bce613b9 JJ |
216 | static int |
217 | cie_eq (const void *e1, const void *e2) | |
65765700 | 218 | { |
a50b1753 NC |
219 | const struct cie *c1 = (const struct cie *) e1; |
220 | const struct cie *c2 = (const struct cie *) e2; | |
bce613b9 JJ |
221 | |
222 | if (c1->hash == c2->hash | |
223 | && c1->length == c2->length | |
65765700 | 224 | && c1->version == c2->version |
f137a54e | 225 | && c1->local_personality == c2->local_personality |
65765700 JJ |
226 | && strcmp (c1->augmentation, c2->augmentation) == 0 |
227 | && strcmp (c1->augmentation, "eh") != 0 | |
228 | && c1->code_align == c2->code_align | |
229 | && c1->data_align == c2->data_align | |
230 | && c1->ra_column == c2->ra_column | |
231 | && c1->augmentation_size == c2->augmentation_size | |
f137a54e AM |
232 | && memcmp (&c1->personality, &c2->personality, |
233 | sizeof (c1->personality)) == 0 | |
4564fb94 AM |
234 | && (c1->cie_inf->u.cie.u.sec->output_section |
235 | == c2->cie_inf->u.cie.u.sec->output_section) | |
65765700 JJ |
236 | && c1->per_encoding == c2->per_encoding |
237 | && c1->lsda_encoding == c2->lsda_encoding | |
238 | && c1->fde_encoding == c2->fde_encoding | |
c39a58e6 | 239 | && c1->initial_insn_length == c2->initial_insn_length |
99d190fa | 240 | && c1->initial_insn_length <= sizeof (c1->initial_instructions) |
65765700 JJ |
241 | && memcmp (c1->initial_instructions, |
242 | c2->initial_instructions, | |
243 | c1->initial_insn_length) == 0) | |
bce613b9 | 244 | return 1; |
65765700 | 245 | |
bce613b9 JJ |
246 | return 0; |
247 | } | |
248 | ||
249 | static hashval_t | |
250 | cie_hash (const void *e) | |
251 | { | |
a50b1753 | 252 | const struct cie *c = (const struct cie *) e; |
bce613b9 JJ |
253 | return c->hash; |
254 | } | |
255 | ||
256 | static hashval_t | |
257 | cie_compute_hash (struct cie *c) | |
258 | { | |
259 | hashval_t h = 0; | |
99d190fa | 260 | size_t len; |
bce613b9 JJ |
261 | h = iterative_hash_object (c->length, h); |
262 | h = iterative_hash_object (c->version, h); | |
263 | h = iterative_hash (c->augmentation, strlen (c->augmentation) + 1, h); | |
264 | h = iterative_hash_object (c->code_align, h); | |
265 | h = iterative_hash_object (c->data_align, h); | |
266 | h = iterative_hash_object (c->ra_column, h); | |
267 | h = iterative_hash_object (c->augmentation_size, h); | |
268 | h = iterative_hash_object (c->personality, h); | |
4564fb94 | 269 | h = iterative_hash_object (c->cie_inf->u.cie.u.sec->output_section, h); |
bce613b9 JJ |
270 | h = iterative_hash_object (c->per_encoding, h); |
271 | h = iterative_hash_object (c->lsda_encoding, h); | |
272 | h = iterative_hash_object (c->fde_encoding, h); | |
273 | h = iterative_hash_object (c->initial_insn_length, h); | |
99d190fa AM |
274 | len = c->initial_insn_length; |
275 | if (len > sizeof (c->initial_instructions)) | |
276 | len = sizeof (c->initial_instructions); | |
277 | h = iterative_hash (c->initial_instructions, len, h); | |
bce613b9 JJ |
278 | c->hash = h; |
279 | return h; | |
65765700 JJ |
280 | } |
281 | ||
353057a5 RS |
282 | /* Return the number of extra bytes that we'll be inserting into |
283 | ENTRY's augmentation string. */ | |
284 | ||
42eec46f | 285 | static inline unsigned int |
353057a5 RS |
286 | extra_augmentation_string_bytes (struct eh_cie_fde *entry) |
287 | { | |
288 | unsigned int size = 0; | |
289 | if (entry->cie) | |
290 | { | |
291 | if (entry->add_augmentation_size) | |
292 | size++; | |
6b2cc140 | 293 | if (entry->u.cie.add_fde_encoding) |
353057a5 RS |
294 | size++; |
295 | } | |
296 | return size; | |
297 | } | |
298 | ||
299 | /* Likewise ENTRY's augmentation data. */ | |
300 | ||
42eec46f | 301 | static inline unsigned int |
353057a5 RS |
302 | extra_augmentation_data_bytes (struct eh_cie_fde *entry) |
303 | { | |
304 | unsigned int size = 0; | |
6b2cc140 RS |
305 | if (entry->add_augmentation_size) |
306 | size++; | |
307 | if (entry->cie && entry->u.cie.add_fde_encoding) | |
308 | size++; | |
353057a5 RS |
309 | return size; |
310 | } | |
311 | ||
2e0ce1c8 | 312 | /* Return the size that ENTRY will have in the output. */ |
353057a5 RS |
313 | |
314 | static unsigned int | |
2e0ce1c8 | 315 | size_of_output_cie_fde (struct eh_cie_fde *entry) |
353057a5 RS |
316 | { |
317 | if (entry->removed) | |
318 | return 0; | |
319 | if (entry->size == 4) | |
320 | return 4; | |
321 | return (entry->size | |
322 | + extra_augmentation_string_bytes (entry) | |
2e0ce1c8 AM |
323 | + extra_augmentation_data_bytes (entry)); |
324 | } | |
325 | ||
326 | /* Return the offset of the FDE or CIE after ENT. */ | |
327 | ||
328 | static unsigned int | |
76c20d54 AM |
329 | next_cie_fde_offset (const struct eh_cie_fde *ent, |
330 | const struct eh_cie_fde *last, | |
331 | const asection *sec) | |
2e0ce1c8 AM |
332 | { |
333 | while (++ent < last) | |
334 | { | |
335 | if (!ent->removed) | |
336 | return ent->new_offset; | |
337 | } | |
338 | return sec->size; | |
353057a5 RS |
339 | } |
340 | ||
dcf507a6 RS |
341 | /* Assume that the bytes between *ITER and END are CFA instructions. |
342 | Try to move *ITER past the first instruction and return true on | |
343 | success. ENCODED_PTR_WIDTH gives the width of pointer entries. */ | |
344 | ||
0a1b45a2 | 345 | static bool |
dcf507a6 RS |
346 | skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) |
347 | { | |
237df762 | 348 | bfd_byte op = 0; |
dcf507a6 RS |
349 | bfd_vma length; |
350 | ||
351 | if (!read_byte (iter, end, &op)) | |
0a1b45a2 | 352 | return false; |
dcf507a6 | 353 | |
ac685e6a | 354 | switch (op & 0xc0 ? op & 0xc0 : op) |
dcf507a6 RS |
355 | { |
356 | case DW_CFA_nop: | |
357 | case DW_CFA_advance_loc: | |
358 | case DW_CFA_restore: | |
ac685e6a JJ |
359 | case DW_CFA_remember_state: |
360 | case DW_CFA_restore_state: | |
361 | case DW_CFA_GNU_window_save: | |
dcf507a6 | 362 | /* No arguments. */ |
0a1b45a2 | 363 | return true; |
dcf507a6 RS |
364 | |
365 | case DW_CFA_offset: | |
366 | case DW_CFA_restore_extended: | |
367 | case DW_CFA_undefined: | |
368 | case DW_CFA_same_value: | |
369 | case DW_CFA_def_cfa_register: | |
370 | case DW_CFA_def_cfa_offset: | |
371 | case DW_CFA_def_cfa_offset_sf: | |
372 | case DW_CFA_GNU_args_size: | |
373 | /* One leb128 argument. */ | |
374 | return skip_leb128 (iter, end); | |
375 | ||
ac685e6a JJ |
376 | case DW_CFA_val_offset: |
377 | case DW_CFA_val_offset_sf: | |
dcf507a6 RS |
378 | case DW_CFA_offset_extended: |
379 | case DW_CFA_register: | |
380 | case DW_CFA_def_cfa: | |
381 | case DW_CFA_offset_extended_sf: | |
382 | case DW_CFA_GNU_negative_offset_extended: | |
383 | case DW_CFA_def_cfa_sf: | |
384 | /* Two leb128 arguments. */ | |
385 | return (skip_leb128 (iter, end) | |
386 | && skip_leb128 (iter, end)); | |
387 | ||
388 | case DW_CFA_def_cfa_expression: | |
389 | /* A variable-length argument. */ | |
390 | return (read_uleb128 (iter, end, &length) | |
391 | && skip_bytes (iter, end, length)); | |
392 | ||
393 | case DW_CFA_expression: | |
ac685e6a | 394 | case DW_CFA_val_expression: |
dcf507a6 RS |
395 | /* A leb128 followed by a variable-length argument. */ |
396 | return (skip_leb128 (iter, end) | |
397 | && read_uleb128 (iter, end, &length) | |
398 | && skip_bytes (iter, end, length)); | |
399 | ||
400 | case DW_CFA_set_loc: | |
401 | return skip_bytes (iter, end, encoded_ptr_width); | |
402 | ||
403 | case DW_CFA_advance_loc1: | |
404 | return skip_bytes (iter, end, 1); | |
405 | ||
406 | case DW_CFA_advance_loc2: | |
407 | return skip_bytes (iter, end, 2); | |
408 | ||
409 | case DW_CFA_advance_loc4: | |
410 | return skip_bytes (iter, end, 4); | |
411 | ||
412 | case DW_CFA_MIPS_advance_loc8: | |
413 | return skip_bytes (iter, end, 8); | |
414 | ||
415 | default: | |
0a1b45a2 | 416 | return false; |
dcf507a6 RS |
417 | } |
418 | } | |
419 | ||
420 | /* Try to interpret the bytes between BUF and END as CFA instructions. | |
421 | If every byte makes sense, return a pointer to the first DW_CFA_nop | |
422 | padding byte, or END if there is no padding. Return null otherwise. | |
423 | ENCODED_PTR_WIDTH is as for skip_cfa_op. */ | |
424 | ||
425 | static bfd_byte * | |
ac685e6a JJ |
426 | skip_non_nops (bfd_byte *buf, bfd_byte *end, unsigned int encoded_ptr_width, |
427 | unsigned int *set_loc_count) | |
dcf507a6 RS |
428 | { |
429 | bfd_byte *last; | |
430 | ||
431 | last = buf; | |
432 | while (buf < end) | |
433 | if (*buf == DW_CFA_nop) | |
434 | buf++; | |
435 | else | |
436 | { | |
ac685e6a JJ |
437 | if (*buf == DW_CFA_set_loc) |
438 | ++*set_loc_count; | |
dcf507a6 RS |
439 | if (!skip_cfa_op (&buf, end, encoded_ptr_width)) |
440 | return 0; | |
441 | last = buf; | |
442 | } | |
443 | return last; | |
444 | } | |
445 | ||
30af5962 RS |
446 | /* Convert absolute encoding ENCODING into PC-relative form. |
447 | SIZE is the size of a pointer. */ | |
448 | ||
449 | static unsigned char | |
450 | make_pc_relative (unsigned char encoding, unsigned int ptr_size) | |
451 | { | |
452 | if ((encoding & 0x7f) == DW_EH_PE_absptr) | |
453 | switch (ptr_size) | |
454 | { | |
455 | case 2: | |
456 | encoding |= DW_EH_PE_sdata2; | |
457 | break; | |
458 | case 4: | |
459 | encoding |= DW_EH_PE_sdata4; | |
460 | break; | |
461 | case 8: | |
462 | encoding |= DW_EH_PE_sdata8; | |
463 | break; | |
464 | } | |
465 | return encoding | DW_EH_PE_pcrel; | |
466 | } | |
467 | ||
2f0c68f2 CM |
468 | /* Examine each .eh_frame_entry section and discard those |
469 | those that are marked SEC_EXCLUDE. */ | |
470 | ||
471 | static void | |
472 | bfd_elf_discard_eh_frame_entry (struct eh_frame_hdr_info *hdr_info) | |
473 | { | |
474 | unsigned int i; | |
475 | for (i = 0; i < hdr_info->array_count; i++) | |
476 | { | |
477 | if (hdr_info->u.compact.entries[i]->flags & SEC_EXCLUDE) | |
478 | { | |
479 | unsigned int j; | |
480 | for (j = i + 1; j < hdr_info->array_count; j++) | |
481 | hdr_info->u.compact.entries[j-1] = hdr_info->u.compact.entries[j]; | |
482 | ||
483 | hdr_info->array_count--; | |
484 | hdr_info->u.compact.entries[hdr_info->array_count] = NULL; | |
485 | i--; | |
07d6d2b8 | 486 | } |
2f0c68f2 CM |
487 | } |
488 | } | |
489 | ||
490 | /* Add a .eh_frame_entry section. */ | |
491 | ||
492 | static void | |
493 | bfd_elf_record_eh_frame_entry (struct eh_frame_hdr_info *hdr_info, | |
494 | asection *sec) | |
495 | { | |
496 | if (hdr_info->array_count == hdr_info->u.compact.allocated_entries) | |
497 | { | |
498 | if (hdr_info->u.compact.allocated_entries == 0) | |
499 | { | |
0a1b45a2 | 500 | hdr_info->frame_hdr_is_compact = true; |
2f0c68f2 CM |
501 | hdr_info->u.compact.allocated_entries = 2; |
502 | hdr_info->u.compact.entries = | |
503 | bfd_malloc (hdr_info->u.compact.allocated_entries | |
504 | * sizeof (hdr_info->u.compact.entries[0])); | |
505 | } | |
506 | else | |
507 | { | |
508 | hdr_info->u.compact.allocated_entries *= 2; | |
509 | hdr_info->u.compact.entries = | |
510 | bfd_realloc (hdr_info->u.compact.entries, | |
511 | hdr_info->u.compact.allocated_entries | |
512 | * sizeof (hdr_info->u.compact.entries[0])); | |
513 | } | |
514 | ||
515 | BFD_ASSERT (hdr_info->u.compact.entries); | |
516 | } | |
517 | ||
518 | hdr_info->u.compact.entries[hdr_info->array_count++] = sec; | |
519 | } | |
520 | ||
521 | /* Parse a .eh_frame_entry section. Figure out which text section it | |
522 | references. */ | |
523 | ||
0a1b45a2 | 524 | bool |
2f0c68f2 CM |
525 | _bfd_elf_parse_eh_frame_entry (struct bfd_link_info *info, |
526 | asection *sec, struct elf_reloc_cookie *cookie) | |
527 | { | |
528 | struct elf_link_hash_table *htab; | |
529 | struct eh_frame_hdr_info *hdr_info; | |
530 | unsigned long r_symndx; | |
531 | asection *text_sec; | |
532 | ||
533 | htab = elf_hash_table (info); | |
534 | hdr_info = &htab->eh_info; | |
535 | ||
536 | if (sec->size == 0 | |
537 | || sec->sec_info_type != SEC_INFO_TYPE_NONE) | |
538 | { | |
0a1b45a2 | 539 | return true; |
2f0c68f2 CM |
540 | } |
541 | ||
542 | if (sec->output_section && bfd_is_abs_section (sec->output_section)) | |
543 | { | |
544 | /* At least one of the sections is being discarded from the | |
545 | link, so we should just ignore them. */ | |
0a1b45a2 | 546 | return true; |
2f0c68f2 CM |
547 | } |
548 | ||
549 | if (cookie->rel == cookie->relend) | |
0a1b45a2 | 550 | return false; |
2f0c68f2 CM |
551 | |
552 | /* The first relocation is the function start. */ | |
553 | r_symndx = cookie->rel->r_info >> cookie->r_sym_shift; | |
554 | if (r_symndx == STN_UNDEF) | |
0a1b45a2 | 555 | return false; |
2f0c68f2 | 556 | |
0a1b45a2 | 557 | text_sec = _bfd_elf_section_for_symbol (cookie, r_symndx, false); |
2f0c68f2 CM |
558 | |
559 | if (text_sec == NULL) | |
0a1b45a2 | 560 | return false; |
2f0c68f2 CM |
561 | |
562 | elf_section_eh_frame_entry (text_sec) = sec; | |
563 | if (text_sec->output_section | |
564 | && bfd_is_abs_section (text_sec->output_section)) | |
565 | sec->flags |= SEC_EXCLUDE; | |
566 | ||
567 | sec->sec_info_type = SEC_INFO_TYPE_EH_FRAME_ENTRY; | |
568 | elf_section_data (sec)->sec_info = text_sec; | |
569 | bfd_elf_record_eh_frame_entry (hdr_info, sec); | |
0a1b45a2 | 570 | return true; |
2f0c68f2 CM |
571 | } |
572 | ||
ca92cecb RS |
573 | /* Try to parse .eh_frame section SEC, which belongs to ABFD. Store the |
574 | information in the section's sec_info field on success. COOKIE | |
575 | describes the relocations in SEC. */ | |
576 | ||
577 | void | |
578 | _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info, | |
579 | asection *sec, struct elf_reloc_cookie *cookie) | |
65765700 | 580 | { |
acfe5567 RS |
581 | #define REQUIRE(COND) \ |
582 | do \ | |
583 | if (!(COND)) \ | |
584 | goto free_no_table; \ | |
585 | while (0) | |
586 | ||
ca92cecb | 587 | bfd_byte *ehbuf = NULL, *buf, *end; |
bce613b9 | 588 | bfd_byte *last_fde; |
ca92cecb | 589 | struct eh_cie_fde *this_inf; |
bce613b9 | 590 | unsigned int hdr_length, hdr_id; |
184d07da RS |
591 | unsigned int cie_count; |
592 | struct cie *cie, *local_cies = NULL; | |
126495ed | 593 | struct elf_link_hash_table *htab; |
65765700 | 594 | struct eh_frame_hdr_info *hdr_info; |
68f69152 | 595 | struct eh_frame_sec_info *sec_info = NULL; |
65765700 | 596 | unsigned int ptr_size; |
ca92cecb RS |
597 | unsigned int num_cies; |
598 | unsigned int num_entries; | |
9d0a14d3 | 599 | elf_gc_mark_hook_fn gc_mark_hook; |
ca92cecb RS |
600 | |
601 | htab = elf_hash_table (info); | |
602 | hdr_info = &htab->eh_info; | |
65765700 | 603 | |
4d16d575 | 604 | if (sec->size == 0 |
81ff113f | 605 | || (sec->flags & SEC_HAS_CONTENTS) == 0 |
dbaa2011 | 606 | || sec->sec_info_type != SEC_INFO_TYPE_NONE) |
65765700 JJ |
607 | { |
608 | /* This file does not contain .eh_frame information. */ | |
ca92cecb | 609 | return; |
65765700 JJ |
610 | } |
611 | ||
e460dd0d | 612 | if (bfd_is_abs_section (sec->output_section)) |
65765700 JJ |
613 | { |
614 | /* At least one of the sections is being discarded from the | |
3472e2e9 | 615 | link, so we should just ignore them. */ |
ca92cecb | 616 | return; |
65765700 JJ |
617 | } |
618 | ||
619 | /* Read the frame unwind information from abfd. */ | |
620 | ||
584b30e4 | 621 | REQUIRE (_bfd_elf_mmap_section_contents (abfd, sec, &ehbuf)); |
68f69152 | 622 | |
65765700 JJ |
623 | /* If .eh_frame section size doesn't fit into int, we cannot handle |
624 | it (it would need to use 64-bit .eh_frame format anyway). */ | |
acfe5567 | 625 | REQUIRE (sec->size == (unsigned int) sec->size); |
65765700 | 626 | |
8c946ed5 RS |
627 | ptr_size = (get_elf_backend_data (abfd) |
628 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
629 | REQUIRE (ptr_size != 0); | |
630 | ||
ca92cecb RS |
631 | /* Go through the section contents and work out how many FDEs and |
632 | CIEs there are. */ | |
65765700 | 633 | buf = ehbuf; |
ca92cecb RS |
634 | end = ehbuf + sec->size; |
635 | num_cies = 0; | |
636 | num_entries = 0; | |
637 | while (buf != end) | |
638 | { | |
639 | num_entries++; | |
640 | ||
641 | /* Read the length of the entry. */ | |
642 | REQUIRE (skip_bytes (&buf, end, 4)); | |
643 | hdr_length = bfd_get_32 (abfd, buf - 4); | |
644 | ||
645 | /* 64-bit .eh_frame is not supported. */ | |
646 | REQUIRE (hdr_length != 0xffffffff); | |
647 | if (hdr_length == 0) | |
648 | break; | |
649 | ||
650 | REQUIRE (skip_bytes (&buf, end, 4)); | |
651 | hdr_id = bfd_get_32 (abfd, buf - 4); | |
652 | if (hdr_id == 0) | |
653 | num_cies++; | |
654 | ||
655 | REQUIRE (skip_bytes (&buf, end, hdr_length - 4)); | |
656 | } | |
657 | ||
a50b1753 NC |
658 | sec_info = (struct eh_frame_sec_info *) |
659 | bfd_zmalloc (sizeof (struct eh_frame_sec_info) | |
07d6d2b8 | 660 | + (num_entries - 1) * sizeof (struct eh_cie_fde)); |
acfe5567 | 661 | REQUIRE (sec_info); |
eea6121a | 662 | |
184d07da | 663 | /* We need to have a "struct cie" for each CIE in this section. */ |
9866ffe2 AM |
664 | if (num_cies) |
665 | { | |
666 | local_cies = (struct cie *) bfd_zmalloc (num_cies * sizeof (*local_cies)); | |
667 | REQUIRE (local_cies); | |
668 | } | |
65765700 | 669 | |
5dabe785 | 670 | /* FIXME: octets_per_byte. */ |
65765700 | 671 | #define ENSURE_NO_RELOCS(buf) \ |
5b69e357 AM |
672 | while (cookie->rel < cookie->relend \ |
673 | && (cookie->rel->r_offset \ | |
674 | < (bfd_size_type) ((buf) - ehbuf))) \ | |
675 | { \ | |
676 | REQUIRE (cookie->rel->r_info == 0); \ | |
677 | cookie->rel++; \ | |
678 | } | |
65765700 | 679 | |
5dabe785 | 680 | /* FIXME: octets_per_byte. */ |
65765700 JJ |
681 | #define SKIP_RELOCS(buf) \ |
682 | while (cookie->rel < cookie->relend \ | |
3472e2e9 | 683 | && (cookie->rel->r_offset \ |
65765700 JJ |
684 | < (bfd_size_type) ((buf) - ehbuf))) \ |
685 | cookie->rel++ | |
686 | ||
5dabe785 | 687 | /* FIXME: octets_per_byte. */ |
65765700 JJ |
688 | #define GET_RELOC(buf) \ |
689 | ((cookie->rel < cookie->relend \ | |
690 | && (cookie->rel->r_offset \ | |
3472e2e9 | 691 | == (bfd_size_type) ((buf) - ehbuf))) \ |
65765700 JJ |
692 | ? cookie->rel : NULL) |
693 | ||
ca92cecb | 694 | buf = ehbuf; |
184d07da | 695 | cie_count = 0; |
9d0a14d3 | 696 | gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook; |
ca92cecb | 697 | while ((bfd_size_type) (buf - ehbuf) != sec->size) |
65765700 | 698 | { |
f075ee0c | 699 | char *aug; |
ca92cecb | 700 | bfd_byte *start, *insns, *insns_end; |
2c42be65 | 701 | bfd_size_type length; |
ac685e6a | 702 | unsigned int set_loc_count; |
65765700 | 703 | |
fda3ecf2 | 704 | this_inf = sec_info->entry + sec_info->count; |
65765700 | 705 | last_fde = buf; |
bce613b9 | 706 | |
bce613b9 JJ |
707 | /* Read the length of the entry. */ |
708 | REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); | |
709 | hdr_length = bfd_get_32 (abfd, buf - 4); | |
acfe5567 | 710 | |
bce613b9 JJ |
711 | /* The CIE/FDE must be fully contained in this input section. */ |
712 | REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr_length <= sec->size); | |
713 | end = buf + hdr_length; | |
65765700 | 714 | |
bce613b9 JJ |
715 | this_inf->offset = last_fde - ehbuf; |
716 | this_inf->size = 4 + hdr_length; | |
155eaaa0 | 717 | this_inf->reloc_index = cookie->rel - cookie->rels; |
bce613b9 JJ |
718 | |
719 | if (hdr_length == 0) | |
720 | { | |
721 | /* A zero-length CIE should only be found at the end of | |
9866ffe2 AM |
722 | the section, but allow multiple terminators. */ |
723 | while (skip_bytes (&buf, ehbuf + sec->size, 4)) | |
724 | REQUIRE (bfd_get_32 (abfd, buf - 4) == 0); | |
bce613b9 JJ |
725 | REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); |
726 | ENSURE_NO_RELOCS (buf); | |
727 | sec_info->count++; | |
728 | break; | |
65765700 JJ |
729 | } |
730 | ||
bce613b9 JJ |
731 | REQUIRE (skip_bytes (&buf, end, 4)); |
732 | hdr_id = bfd_get_32 (abfd, buf - 4); | |
733 | ||
734 | if (hdr_id == 0) | |
65765700 JJ |
735 | { |
736 | unsigned int initial_insn_length; | |
737 | ||
738 | /* CIE */ | |
bce613b9 JJ |
739 | this_inf->cie = 1; |
740 | ||
184d07da RS |
741 | /* Point CIE to one of the section-local cie structures. */ |
742 | cie = local_cies + cie_count++; | |
743 | ||
ca92cecb | 744 | cie->cie_inf = this_inf; |
bce613b9 | 745 | cie->length = hdr_length; |
ac685e6a | 746 | start = buf; |
bce613b9 | 747 | REQUIRE (read_byte (&buf, end, &cie->version)); |
65765700 JJ |
748 | |
749 | /* Cannot handle unknown versions. */ | |
604282a7 JJ |
750 | REQUIRE (cie->version == 1 |
751 | || cie->version == 3 | |
752 | || cie->version == 4); | |
bce613b9 | 753 | REQUIRE (strlen ((char *) buf) < sizeof (cie->augmentation)); |
65765700 | 754 | |
bce613b9 | 755 | strcpy (cie->augmentation, (char *) buf); |
f075ee0c | 756 | buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1; |
d7153c4a | 757 | this_inf->u.cie.aug_str_len = buf - start - 1; |
65765700 JJ |
758 | ENSURE_NO_RELOCS (buf); |
759 | if (buf[0] == 'e' && buf[1] == 'h') | |
760 | { | |
761 | /* GCC < 3.0 .eh_frame CIE */ | |
762 | /* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__ | |
763 | is private to each CIE, so we don't need it for anything. | |
764 | Just skip it. */ | |
2c42be65 | 765 | REQUIRE (skip_bytes (&buf, end, ptr_size)); |
65765700 JJ |
766 | SKIP_RELOCS (buf); |
767 | } | |
604282a7 JJ |
768 | if (cie->version >= 4) |
769 | { | |
770 | REQUIRE (buf + 1 < end); | |
771 | REQUIRE (buf[0] == ptr_size); | |
772 | REQUIRE (buf[1] == 0); | |
773 | buf += 2; | |
774 | } | |
bce613b9 JJ |
775 | REQUIRE (read_uleb128 (&buf, end, &cie->code_align)); |
776 | REQUIRE (read_sleb128 (&buf, end, &cie->data_align)); | |
777 | if (cie->version == 1) | |
2c42be65 RS |
778 | { |
779 | REQUIRE (buf < end); | |
bce613b9 | 780 | cie->ra_column = *buf++; |
2c42be65 | 781 | } |
0da76f83 | 782 | else |
bce613b9 | 783 | REQUIRE (read_uleb128 (&buf, end, &cie->ra_column)); |
65765700 | 784 | ENSURE_NO_RELOCS (buf); |
bce613b9 JJ |
785 | cie->lsda_encoding = DW_EH_PE_omit; |
786 | cie->fde_encoding = DW_EH_PE_omit; | |
787 | cie->per_encoding = DW_EH_PE_omit; | |
788 | aug = cie->augmentation; | |
65765700 JJ |
789 | if (aug[0] != 'e' || aug[1] != 'h') |
790 | { | |
791 | if (*aug == 'z') | |
792 | { | |
793 | aug++; | |
bce613b9 | 794 | REQUIRE (read_uleb128 (&buf, end, &cie->augmentation_size)); |
07d6d2b8 | 795 | ENSURE_NO_RELOCS (buf); |
65765700 JJ |
796 | } |
797 | ||
798 | while (*aug != '\0') | |
799 | switch (*aug++) | |
800 | { | |
3a67e1a6 ST |
801 | case 'B': |
802 | break; | |
65765700 | 803 | case 'L': |
bce613b9 | 804 | REQUIRE (read_byte (&buf, end, &cie->lsda_encoding)); |
65765700 | 805 | ENSURE_NO_RELOCS (buf); |
bce613b9 | 806 | REQUIRE (get_DW_EH_PE_width (cie->lsda_encoding, ptr_size)); |
65765700 JJ |
807 | break; |
808 | case 'R': | |
bce613b9 | 809 | REQUIRE (read_byte (&buf, end, &cie->fde_encoding)); |
65765700 | 810 | ENSURE_NO_RELOCS (buf); |
bce613b9 | 811 | REQUIRE (get_DW_EH_PE_width (cie->fde_encoding, ptr_size)); |
65765700 | 812 | break; |
63752a75 JJ |
813 | case 'S': |
814 | break; | |
65765700 JJ |
815 | case 'P': |
816 | { | |
817 | int per_width; | |
818 | ||
bce613b9 JJ |
819 | REQUIRE (read_byte (&buf, end, &cie->per_encoding)); |
820 | per_width = get_DW_EH_PE_width (cie->per_encoding, | |
65765700 | 821 | ptr_size); |
acfe5567 | 822 | REQUIRE (per_width); |
18e04883 | 823 | if ((cie->per_encoding & 0x70) == DW_EH_PE_aligned) |
2c42be65 RS |
824 | { |
825 | length = -(buf - ehbuf) & (per_width - 1); | |
826 | REQUIRE (skip_bytes (&buf, end, length)); | |
2e0ce1c8 AM |
827 | if (per_width == 8) |
828 | this_inf->u.cie.per_encoding_aligned8 = 1; | |
2c42be65 | 829 | } |
18e04883 | 830 | this_inf->u.cie.personality_offset = buf - start; |
65765700 | 831 | ENSURE_NO_RELOCS (buf); |
f137a54e | 832 | /* Ensure we have a reloc here. */ |
184d07da RS |
833 | REQUIRE (GET_RELOC (buf)); |
834 | cie->personality.reloc_index | |
835 | = cookie->rel - cookie->rels; | |
836 | /* Cope with MIPS-style composite relocations. */ | |
837 | do | |
838 | cookie->rel++; | |
839 | while (GET_RELOC (buf) != NULL); | |
2c42be65 | 840 | REQUIRE (skip_bytes (&buf, end, per_width)); |
65765700 JJ |
841 | } |
842 | break; | |
843 | default: | |
844 | /* Unrecognized augmentation. Better bail out. */ | |
845 | goto free_no_table; | |
846 | } | |
847 | } | |
d7153c4a AM |
848 | this_inf->u.cie.aug_data_len |
849 | = buf - start - 1 - this_inf->u.cie.aug_str_len; | |
65765700 JJ |
850 | |
851 | /* For shared libraries, try to get rid of as many RELATIVE relocs | |
0bb2d96a | 852 | as possible. */ |
0e1862bb | 853 | if (bfd_link_pic (info) |
ec3391e7 AO |
854 | && (get_elf_backend_data (abfd) |
855 | ->elf_backend_can_make_relative_eh_frame | |
353057a5 RS |
856 | (abfd, info, sec))) |
857 | { | |
18e04883 | 858 | if ((cie->fde_encoding & 0x70) == DW_EH_PE_absptr) |
6b2cc140 | 859 | this_inf->make_relative = 1; |
353057a5 RS |
860 | /* If the CIE doesn't already have an 'R' entry, it's fairly |
861 | easy to add one, provided that there's no aligned data | |
862 | after the augmentation string. */ | |
bce613b9 | 863 | else if (cie->fde_encoding == DW_EH_PE_omit |
18e04883 | 864 | && (cie->per_encoding & 0x70) != DW_EH_PE_aligned) |
353057a5 | 865 | { |
bce613b9 | 866 | if (*cie->augmentation == 0) |
353057a5 | 867 | this_inf->add_augmentation_size = 1; |
6b2cc140 RS |
868 | this_inf->u.cie.add_fde_encoding = 1; |
869 | this_inf->make_relative = 1; | |
353057a5 | 870 | } |
65765700 | 871 | |
18e04883 RS |
872 | if ((cie->lsda_encoding & 0x70) == DW_EH_PE_absptr) |
873 | cie->can_make_lsda_relative = 1; | |
874 | } | |
9e2a4898 | 875 | |
65765700 JJ |
876 | /* If FDE encoding was not specified, it defaults to |
877 | DW_EH_absptr. */ | |
bce613b9 JJ |
878 | if (cie->fde_encoding == DW_EH_PE_omit) |
879 | cie->fde_encoding = DW_EH_PE_absptr; | |
65765700 | 880 | |
dcf507a6 | 881 | initial_insn_length = end - buf; |
99d190fa AM |
882 | cie->initial_insn_length = initial_insn_length; |
883 | memcpy (cie->initial_instructions, buf, | |
884 | initial_insn_length <= sizeof (cie->initial_instructions) | |
885 | ? initial_insn_length : sizeof (cie->initial_instructions)); | |
dcf507a6 | 886 | insns = buf; |
65765700 JJ |
887 | buf += initial_insn_length; |
888 | ENSURE_NO_RELOCS (buf); | |
ca92cecb | 889 | |
0e1862bb | 890 | if (!bfd_link_relocatable (info)) |
5b69e357 AM |
891 | { |
892 | /* Keep info for merging cies. */ | |
893 | this_inf->u.cie.u.full_cie = cie; | |
894 | this_inf->u.cie.per_encoding_relative | |
895 | = (cie->per_encoding & 0x70) == DW_EH_PE_pcrel; | |
896 | } | |
65765700 JJ |
897 | } |
898 | else | |
899 | { | |
bce613b9 JJ |
900 | /* Find the corresponding CIE. */ |
901 | unsigned int cie_offset = this_inf->offset + 4 - hdr_id; | |
184d07da RS |
902 | for (cie = local_cies; cie < local_cies + cie_count; cie++) |
903 | if (cie_offset == cie->cie_inf->offset) | |
bce613b9 JJ |
904 | break; |
905 | ||
906 | /* Ensure this FDE references one of the CIEs in this input | |
907 | section. */ | |
184d07da RS |
908 | REQUIRE (cie != local_cies + cie_count); |
909 | this_inf->u.fde.cie_inf = cie->cie_inf; | |
910 | this_inf->make_relative = cie->cie_inf->make_relative; | |
6b2cc140 | 911 | this_inf->add_augmentation_size |
184d07da | 912 | = cie->cie_inf->add_augmentation_size; |
65765700 JJ |
913 | |
914 | ENSURE_NO_RELOCS (buf); | |
e41b3a13 | 915 | if ((sec->flags & SEC_LINKER_CREATED) == 0 || cookie->rels != NULL) |
2a7b2e88 | 916 | { |
e41b3a13 JJ |
917 | asection *rsec; |
918 | ||
919 | REQUIRE (GET_RELOC (buf)); | |
920 | ||
921 | /* Chain together the FDEs for each section. */ | |
1cce69b9 AM |
922 | rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, |
923 | cookie, NULL); | |
e41b3a13 JJ |
924 | /* RSEC will be NULL if FDE was cleared out as it was belonging to |
925 | a discarded SHT_GROUP. */ | |
926 | if (rsec) | |
927 | { | |
928 | REQUIRE (rsec->owner == abfd); | |
929 | this_inf->u.fde.next_for_section = elf_fde_list (rsec); | |
930 | elf_fde_list (rsec) = this_inf; | |
931 | } | |
2a7b2e88 | 932 | } |
9d0a14d3 | 933 | |
2c42be65 RS |
934 | /* Skip the initial location and address range. */ |
935 | start = buf; | |
bce613b9 | 936 | length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); |
2c42be65 RS |
937 | REQUIRE (skip_bytes (&buf, end, 2 * length)); |
938 | ||
c2aaac08 AM |
939 | SKIP_RELOCS (buf - length); |
940 | if (!GET_RELOC (buf - length) | |
0a1b45a2 | 941 | && read_value (abfd, buf - length, length, false) == 0) |
c2aaac08 AM |
942 | { |
943 | (*info->callbacks->minfo) | |
695344c0 | 944 | /* xgettext:c-format */ |
871b3ab2 | 945 | (_("discarding zero address range FDE in %pB(%pA).\n"), |
c2aaac08 AM |
946 | abfd, sec); |
947 | this_inf->u.fde.cie_inf = NULL; | |
948 | } | |
949 | ||
2c42be65 | 950 | /* Skip the augmentation size, if present. */ |
bce613b9 | 951 | if (cie->augmentation[0] == 'z') |
dcf507a6 RS |
952 | REQUIRE (read_uleb128 (&buf, end, &length)); |
953 | else | |
954 | length = 0; | |
2c42be65 RS |
955 | |
956 | /* Of the supported augmentation characters above, only 'L' | |
957 | adds augmentation data to the FDE. This code would need to | |
958 | be adjusted if any future augmentations do the same thing. */ | |
bce613b9 | 959 | if (cie->lsda_encoding != DW_EH_PE_omit) |
dcf507a6 | 960 | { |
9f4b847e RS |
961 | SKIP_RELOCS (buf); |
962 | if (cie->can_make_lsda_relative && GET_RELOC (buf)) | |
963 | cie->cie_inf->u.cie.make_lsda_relative = 1; | |
dcf507a6 RS |
964 | this_inf->lsda_offset = buf - start; |
965 | /* If there's no 'z' augmentation, we don't know where the | |
966 | CFA insns begin. Assume no padding. */ | |
bce613b9 | 967 | if (cie->augmentation[0] != 'z') |
dcf507a6 RS |
968 | length = end - buf; |
969 | } | |
970 | ||
971 | /* Skip over the augmentation data. */ | |
972 | REQUIRE (skip_bytes (&buf, end, length)); | |
973 | insns = buf; | |
9e2a4898 | 974 | |
bce613b9 | 975 | buf = last_fde + 4 + hdr_length; |
2a7b2e88 | 976 | |
273f4430 JK |
977 | /* For NULL RSEC (cleared FDE belonging to a discarded section) |
978 | the relocations are commonly cleared. We do not sanity check if | |
979 | all these relocations are cleared as (1) relocations to | |
980 | .gcc_except_table will remain uncleared (they will get dropped | |
981 | with the drop of this unused FDE) and (2) BFD already safely drops | |
982 | relocations of any type to .eh_frame by | |
983 | elf_section_ignore_discarded_relocs. | |
984 | TODO: The .gcc_except_table entries should be also filtered as | |
985 | .eh_frame entries; or GCC could rather use COMDAT for them. */ | |
986 | SKIP_RELOCS (buf); | |
65765700 JJ |
987 | } |
988 | ||
dcf507a6 RS |
989 | /* Try to interpret the CFA instructions and find the first |
990 | padding nop. Shrink this_inf's size so that it doesn't | |
ac685e6a | 991 | include the padding. */ |
bce613b9 | 992 | length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); |
ac685e6a JJ |
993 | set_loc_count = 0; |
994 | insns_end = skip_non_nops (insns, end, length, &set_loc_count); | |
995 | /* If we don't understand the CFA instructions, we can't know | |
996 | what needs to be adjusted there. */ | |
997 | if (insns_end == NULL | |
998 | /* For the time being we don't support DW_CFA_set_loc in | |
999 | CIE instructions. */ | |
1000 | || (set_loc_count && this_inf->cie)) | |
1001 | goto free_no_table; | |
1002 | this_inf->size -= end - insns_end; | |
bce613b9 JJ |
1003 | if (insns_end != end && this_inf->cie) |
1004 | { | |
1005 | cie->initial_insn_length -= end - insns_end; | |
1006 | cie->length -= end - insns_end; | |
1007 | } | |
ac685e6a | 1008 | if (set_loc_count |
18e04883 | 1009 | && ((cie->fde_encoding & 0x70) == DW_EH_PE_pcrel |
6b2cc140 | 1010 | || this_inf->make_relative)) |
ac685e6a JJ |
1011 | { |
1012 | unsigned int cnt; | |
1013 | bfd_byte *p; | |
1014 | ||
a50b1753 | 1015 | this_inf->set_loc = (unsigned int *) |
07d6d2b8 | 1016 | bfd_malloc ((set_loc_count + 1) * sizeof (unsigned int)); |
ac685e6a JJ |
1017 | REQUIRE (this_inf->set_loc); |
1018 | this_inf->set_loc[0] = set_loc_count; | |
1019 | p = insns; | |
1020 | cnt = 0; | |
1021 | while (p < end) | |
1022 | { | |
1023 | if (*p == DW_CFA_set_loc) | |
1024 | this_inf->set_loc[++cnt] = p + 1 - start; | |
1025 | REQUIRE (skip_cfa_op (&p, end, length)); | |
1026 | } | |
1027 | } | |
dcf507a6 | 1028 | |
ca92cecb | 1029 | this_inf->removed = 1; |
bce613b9 JJ |
1030 | this_inf->fde_encoding = cie->fde_encoding; |
1031 | this_inf->lsda_encoding = cie->lsda_encoding; | |
65765700 JJ |
1032 | sec_info->count++; |
1033 | } | |
ca92cecb | 1034 | BFD_ASSERT (sec_info->count == num_entries); |
184d07da | 1035 | BFD_ASSERT (cie_count == num_cies); |
65765700 JJ |
1036 | |
1037 | elf_section_data (sec)->sec_info = sec_info; | |
dbaa2011 | 1038 | sec->sec_info_type = SEC_INFO_TYPE_EH_FRAME; |
0e1862bb | 1039 | if (!bfd_link_relocatable (info)) |
184d07da | 1040 | { |
da44f4e5 | 1041 | /* Keep info for merging cies. */ |
184d07da RS |
1042 | sec_info->cies = local_cies; |
1043 | local_cies = NULL; | |
1044 | } | |
ca92cecb | 1045 | goto success; |
65765700 | 1046 | |
ca92cecb | 1047 | free_no_table: |
9793eb77 | 1048 | _bfd_error_handler |
695344c0 | 1049 | /* xgettext:c-format */ |
9793eb77 | 1050 | (_("error in %pB(%pA); no .eh_frame_hdr table will be created"), |
ca92cecb | 1051 | abfd, sec); |
0a1b45a2 | 1052 | hdr_info->u.dwarf.table = false; |
c9594989 | 1053 | free (sec_info); |
ca92cecb | 1054 | success: |
584b30e4 | 1055 | _bfd_elf_munmap_section_contents (sec, ehbuf); |
c9594989 | 1056 | free (local_cies); |
ca92cecb RS |
1057 | #undef REQUIRE |
1058 | } | |
bce613b9 | 1059 | |
2f0c68f2 CM |
1060 | /* Order eh_frame_hdr entries by the VMA of their text section. */ |
1061 | ||
1062 | static int | |
1063 | cmp_eh_frame_hdr (const void *a, const void *b) | |
1064 | { | |
1065 | bfd_vma text_a; | |
1066 | bfd_vma text_b; | |
1067 | asection *sec; | |
1068 | ||
1069 | sec = *(asection *const *)a; | |
1070 | sec = (asection *) elf_section_data (sec)->sec_info; | |
1071 | text_a = sec->output_section->vma + sec->output_offset; | |
1072 | sec = *(asection *const *)b; | |
1073 | sec = (asection *) elf_section_data (sec)->sec_info; | |
1074 | text_b = sec->output_section->vma + sec->output_offset; | |
1075 | ||
1076 | if (text_a < text_b) | |
1077 | return -1; | |
1078 | return text_a > text_b; | |
1079 | ||
1080 | } | |
1081 | ||
1082 | /* Add space for a CANTUNWIND terminator to SEC if the text sections | |
1083 | referenced by it and NEXT are not contiguous, or NEXT is NULL. */ | |
1084 | ||
1085 | static void | |
1086 | add_eh_frame_hdr_terminator (asection *sec, | |
1087 | asection *next) | |
1088 | { | |
1089 | bfd_vma end; | |
1090 | bfd_vma next_start; | |
1091 | asection *text_sec; | |
1092 | ||
1093 | if (next) | |
1094 | { | |
1095 | /* See if there is a gap (presumably a text section without unwind info) | |
1096 | between these two entries. */ | |
1097 | text_sec = (asection *) elf_section_data (sec)->sec_info; | |
1098 | end = text_sec->output_section->vma + text_sec->output_offset | |
1099 | + text_sec->size; | |
1100 | text_sec = (asection *) elf_section_data (next)->sec_info; | |
1101 | next_start = text_sec->output_section->vma + text_sec->output_offset; | |
1102 | if (end == next_start) | |
1103 | return; | |
1104 | } | |
1105 | ||
1106 | /* Add space for a CANTUNWIND terminator. */ | |
1107 | if (!sec->rawsize) | |
1108 | sec->rawsize = sec->size; | |
1109 | ||
fd361982 | 1110 | bfd_set_section_size (sec, sec->size + 8); |
2f0c68f2 CM |
1111 | } |
1112 | ||
1113 | /* Finish a pass over all .eh_frame_entry sections. */ | |
1114 | ||
0a1b45a2 | 1115 | bool |
2f0c68f2 CM |
1116 | _bfd_elf_end_eh_frame_parsing (struct bfd_link_info *info) |
1117 | { | |
1118 | struct eh_frame_hdr_info *hdr_info; | |
1119 | unsigned int i; | |
1120 | ||
1121 | hdr_info = &elf_hash_table (info)->eh_info; | |
1122 | ||
1123 | if (info->eh_frame_hdr_type != COMPACT_EH_HDR | |
1124 | || hdr_info->array_count == 0) | |
0a1b45a2 | 1125 | return false; |
2f0c68f2 CM |
1126 | |
1127 | bfd_elf_discard_eh_frame_entry (hdr_info); | |
1128 | ||
1129 | qsort (hdr_info->u.compact.entries, hdr_info->array_count, | |
1130 | sizeof (asection *), cmp_eh_frame_hdr); | |
1131 | ||
1132 | for (i = 0; i < hdr_info->array_count - 1; i++) | |
1133 | { | |
1134 | add_eh_frame_hdr_terminator (hdr_info->u.compact.entries[i], | |
1135 | hdr_info->u.compact.entries[i + 1]); | |
1136 | } | |
1137 | ||
1138 | /* Add a CANTUNWIND terminator after the last entry. */ | |
1139 | add_eh_frame_hdr_terminator (hdr_info->u.compact.entries[i], NULL); | |
0a1b45a2 | 1140 | return true; |
2f0c68f2 CM |
1141 | } |
1142 | ||
9d0a14d3 RS |
1143 | /* Mark all relocations against CIE or FDE ENT, which occurs in |
1144 | .eh_frame section SEC. COOKIE describes the relocations in SEC; | |
1145 | its "rel" field can be changed freely. */ | |
1146 | ||
0a1b45a2 | 1147 | static bool |
9d0a14d3 RS |
1148 | mark_entry (struct bfd_link_info *info, asection *sec, |
1149 | struct eh_cie_fde *ent, elf_gc_mark_hook_fn gc_mark_hook, | |
1150 | struct elf_reloc_cookie *cookie) | |
1151 | { | |
5dabe785 | 1152 | /* FIXME: octets_per_byte. */ |
9d0a14d3 RS |
1153 | for (cookie->rel = cookie->rels + ent->reloc_index; |
1154 | cookie->rel < cookie->relend | |
1155 | && cookie->rel->r_offset < ent->offset + ent->size; | |
1156 | cookie->rel++) | |
1157 | if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, cookie)) | |
0a1b45a2 | 1158 | return false; |
9d0a14d3 | 1159 | |
0a1b45a2 | 1160 | return true; |
9d0a14d3 RS |
1161 | } |
1162 | ||
1163 | /* Mark all the relocations against FDEs that relate to code in input | |
1164 | section SEC. The FDEs belong to .eh_frame section EH_FRAME, whose | |
1165 | relocations are described by COOKIE. */ | |
1166 | ||
0a1b45a2 | 1167 | bool |
9d0a14d3 RS |
1168 | _bfd_elf_gc_mark_fdes (struct bfd_link_info *info, asection *sec, |
1169 | asection *eh_frame, elf_gc_mark_hook_fn gc_mark_hook, | |
1170 | struct elf_reloc_cookie *cookie) | |
1171 | { | |
184d07da | 1172 | struct eh_cie_fde *fde, *cie; |
9d0a14d3 RS |
1173 | |
1174 | for (fde = elf_fde_list (sec); fde; fde = fde->u.fde.next_for_section) | |
1175 | { | |
1176 | if (!mark_entry (info, eh_frame, fde, gc_mark_hook, cookie)) | |
0a1b45a2 | 1177 | return false; |
9d0a14d3 RS |
1178 | |
1179 | /* At this stage, all cie_inf fields point to local CIEs, so we | |
1180 | can use the same cookie to refer to them. */ | |
1181 | cie = fde->u.fde.cie_inf; | |
c2aaac08 | 1182 | if (cie != NULL && !cie->u.cie.gc_mark) |
9d0a14d3 | 1183 | { |
184d07da | 1184 | cie->u.cie.gc_mark = 1; |
9d0a14d3 | 1185 | if (!mark_entry (info, eh_frame, cie, gc_mark_hook, cookie)) |
0a1b45a2 | 1186 | return false; |
9d0a14d3 RS |
1187 | } |
1188 | } | |
0a1b45a2 | 1189 | return true; |
9d0a14d3 RS |
1190 | } |
1191 | ||
184d07da RS |
1192 | /* Input section SEC of ABFD is an .eh_frame section that contains the |
1193 | CIE described by CIE_INF. Return a version of CIE_INF that is going | |
1194 | to be kept in the output, adding CIE_INF to the output if necessary. | |
1195 | ||
1196 | HDR_INFO is the .eh_frame_hdr information and COOKIE describes the | |
1197 | relocations in REL. */ | |
1198 | ||
1199 | static struct eh_cie_fde * | |
18e04883 | 1200 | find_merged_cie (bfd *abfd, struct bfd_link_info *info, asection *sec, |
184d07da RS |
1201 | struct eh_frame_hdr_info *hdr_info, |
1202 | struct elf_reloc_cookie *cookie, | |
1203 | struct eh_cie_fde *cie_inf) | |
1204 | { | |
1205 | unsigned long r_symndx; | |
1206 | struct cie *cie, *new_cie; | |
1207 | Elf_Internal_Rela *rel; | |
1208 | void **loc; | |
1209 | ||
1210 | /* Use CIE_INF if we have already decided to keep it. */ | |
1211 | if (!cie_inf->removed) | |
1212 | return cie_inf; | |
1213 | ||
1214 | /* If we have merged CIE_INF with another CIE, use that CIE instead. */ | |
1215 | if (cie_inf->u.cie.merged) | |
1216 | return cie_inf->u.cie.u.merged_with; | |
1217 | ||
1218 | cie = cie_inf->u.cie.u.full_cie; | |
1219 | ||
1220 | /* Assume we will need to keep CIE_INF. */ | |
1221 | cie_inf->removed = 0; | |
1222 | cie_inf->u.cie.u.sec = sec; | |
1223 | ||
1224 | /* If we are not merging CIEs, use CIE_INF. */ | |
1225 | if (cie == NULL) | |
1226 | return cie_inf; | |
1227 | ||
1228 | if (cie->per_encoding != DW_EH_PE_omit) | |
1229 | { | |
0a1b45a2 | 1230 | bool per_binds_local; |
18e04883 | 1231 | |
5087d529 AM |
1232 | /* Work out the address of personality routine, or at least |
1233 | enough info that we could calculate the address had we made a | |
1234 | final section layout. The symbol on the reloc is enough, | |
1235 | either the hash for a global, or (bfd id, index) pair for a | |
1236 | local. The assumption here is that no one uses addends on | |
1237 | the reloc. */ | |
184d07da RS |
1238 | rel = cookie->rels + cie->personality.reloc_index; |
1239 | memset (&cie->personality, 0, sizeof (cie->personality)); | |
1240 | #ifdef BFD64 | |
1241 | if (elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64) | |
1242 | r_symndx = ELF64_R_SYM (rel->r_info); | |
1243 | else | |
1244 | #endif | |
1245 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1246 | if (r_symndx >= cookie->locsymcount | |
1247 | || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL) | |
1248 | { | |
1249 | struct elf_link_hash_entry *h; | |
1250 | ||
1251 | r_symndx -= cookie->extsymoff; | |
1252 | h = cookie->sym_hashes[r_symndx]; | |
1253 | ||
1254 | while (h->root.type == bfd_link_hash_indirect | |
1255 | || h->root.type == bfd_link_hash_warning) | |
1256 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1257 | ||
1258 | cie->personality.h = h; | |
18e04883 | 1259 | per_binds_local = SYMBOL_REFERENCES_LOCAL (info, h); |
184d07da RS |
1260 | } |
1261 | else | |
1262 | { | |
1263 | Elf_Internal_Sym *sym; | |
1264 | asection *sym_sec; | |
1265 | ||
1266 | sym = &cookie->locsyms[r_symndx]; | |
1267 | sym_sec = bfd_section_from_elf_index (abfd, sym->st_shndx); | |
1268 | if (sym_sec == NULL) | |
1269 | return cie_inf; | |
1270 | ||
1271 | if (sym_sec->kept_section != NULL) | |
1272 | sym_sec = sym_sec->kept_section; | |
1273 | if (sym_sec->output_section == NULL) | |
1274 | return cie_inf; | |
1275 | ||
1276 | cie->local_personality = 1; | |
5087d529 AM |
1277 | cie->personality.sym.bfd_id = abfd->id; |
1278 | cie->personality.sym.index = r_symndx; | |
0a1b45a2 | 1279 | per_binds_local = true; |
18e04883 RS |
1280 | } |
1281 | ||
1282 | if (per_binds_local | |
0e1862bb | 1283 | && bfd_link_pic (info) |
18e04883 RS |
1284 | && (cie->per_encoding & 0x70) == DW_EH_PE_absptr |
1285 | && (get_elf_backend_data (abfd) | |
1286 | ->elf_backend_can_make_relative_eh_frame (abfd, info, sec))) | |
1287 | { | |
1288 | cie_inf->u.cie.make_per_encoding_relative = 1; | |
1289 | cie_inf->u.cie.per_encoding_relative = 1; | |
184d07da RS |
1290 | } |
1291 | } | |
1292 | ||
1293 | /* See if we can merge this CIE with an earlier one. */ | |
184d07da | 1294 | cie_compute_hash (cie); |
2f0c68f2 | 1295 | if (hdr_info->u.dwarf.cies == NULL) |
184d07da | 1296 | { |
2f0c68f2 CM |
1297 | hdr_info->u.dwarf.cies = htab_try_create (1, cie_hash, cie_eq, free); |
1298 | if (hdr_info->u.dwarf.cies == NULL) | |
184d07da RS |
1299 | return cie_inf; |
1300 | } | |
2f0c68f2 CM |
1301 | loc = htab_find_slot_with_hash (hdr_info->u.dwarf.cies, cie, |
1302 | cie->hash, INSERT); | |
184d07da RS |
1303 | if (loc == NULL) |
1304 | return cie_inf; | |
1305 | ||
1306 | new_cie = (struct cie *) *loc; | |
1307 | if (new_cie == NULL) | |
1308 | { | |
1309 | /* Keep CIE_INF and record it in the hash table. */ | |
a50b1753 | 1310 | new_cie = (struct cie *) malloc (sizeof (struct cie)); |
184d07da RS |
1311 | if (new_cie == NULL) |
1312 | return cie_inf; | |
1313 | ||
1314 | memcpy (new_cie, cie, sizeof (struct cie)); | |
1315 | *loc = new_cie; | |
1316 | } | |
1317 | else | |
1318 | { | |
1319 | /* Merge CIE_INF with NEW_CIE->CIE_INF. */ | |
1320 | cie_inf->removed = 1; | |
1321 | cie_inf->u.cie.merged = 1; | |
1322 | cie_inf->u.cie.u.merged_with = new_cie->cie_inf; | |
1323 | if (cie_inf->u.cie.make_lsda_relative) | |
1324 | new_cie->cie_inf->u.cie.make_lsda_relative = 1; | |
1325 | } | |
1326 | return new_cie->cie_inf; | |
1327 | } | |
1328 | ||
d7153c4a AM |
1329 | /* For a given OFFSET in SEC, return the delta to the new location |
1330 | after .eh_frame editing. */ | |
1331 | ||
1332 | static bfd_signed_vma | |
76c20d54 | 1333 | offset_adjust (bfd_vma offset, const asection *sec) |
d7153c4a AM |
1334 | { |
1335 | struct eh_frame_sec_info *sec_info | |
1336 | = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; | |
1337 | unsigned int lo, hi, mid; | |
96d01d93 | 1338 | struct eh_cie_fde *ent = NULL; |
d7153c4a AM |
1339 | bfd_signed_vma delta; |
1340 | ||
1341 | lo = 0; | |
1342 | hi = sec_info->count; | |
1343 | if (hi == 0) | |
1344 | return 0; | |
1345 | ||
1346 | while (lo < hi) | |
1347 | { | |
1348 | mid = (lo + hi) / 2; | |
1349 | ent = &sec_info->entry[mid]; | |
1350 | if (offset < ent->offset) | |
1351 | hi = mid; | |
1352 | else if (mid + 1 >= hi) | |
1353 | break; | |
1354 | else if (offset >= ent[1].offset) | |
1355 | lo = mid + 1; | |
1356 | else | |
1357 | break; | |
1358 | } | |
1359 | ||
1360 | if (!ent->removed) | |
1361 | delta = (bfd_vma) ent->new_offset - (bfd_vma) ent->offset; | |
1362 | else if (ent->cie && ent->u.cie.merged) | |
1363 | { | |
1364 | struct eh_cie_fde *cie = ent->u.cie.u.merged_with; | |
1365 | delta = ((bfd_vma) cie->new_offset + cie->u.cie.u.sec->output_offset | |
1366 | - (bfd_vma) ent->offset - sec->output_offset); | |
1367 | } | |
1368 | else | |
1369 | { | |
1370 | /* Is putting the symbol on the next entry best for a deleted | |
1371 | CIE/FDE? */ | |
1372 | struct eh_cie_fde *last = sec_info->entry + sec_info->count; | |
1373 | delta = ((bfd_vma) next_cie_fde_offset (ent, last, sec) | |
1374 | - (bfd_vma) ent->offset); | |
1375 | return delta; | |
1376 | } | |
1377 | ||
1378 | /* Account for editing within this CIE/FDE. */ | |
1379 | offset -= ent->offset; | |
1380 | if (ent->cie) | |
1381 | { | |
1382 | unsigned int extra | |
1383 | = ent->add_augmentation_size + ent->u.cie.add_fde_encoding; | |
1384 | if (extra == 0 | |
1385 | || offset <= 9u + ent->u.cie.aug_str_len) | |
1386 | return delta; | |
1387 | delta += extra; | |
1388 | if (offset <= 9u + ent->u.cie.aug_str_len + ent->u.cie.aug_data_len) | |
1389 | return delta; | |
1390 | delta += extra; | |
1391 | } | |
1392 | else | |
1393 | { | |
1394 | unsigned int ptr_size, width, extra = ent->add_augmentation_size; | |
1395 | if (offset <= 12 || extra == 0) | |
1396 | return delta; | |
1397 | ptr_size = (get_elf_backend_data (sec->owner) | |
1398 | ->elf_backend_eh_frame_address_size (sec->owner, sec)); | |
1399 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1400 | if (offset <= 8 + 2 * width) | |
1401 | return delta; | |
1402 | delta += extra; | |
1403 | } | |
1404 | ||
1405 | return delta; | |
1406 | } | |
1407 | ||
1408 | /* Adjust a global symbol defined in .eh_frame, so that it stays | |
1409 | relative to its original CIE/FDE. It is assumed that a symbol | |
1410 | defined at the beginning of a CIE/FDE belongs to that CIE/FDE | |
1411 | rather than marking the end of the previous CIE/FDE. This matters | |
1412 | when a CIE is merged with a previous CIE, since the symbol is | |
1413 | moved to the merged CIE. */ | |
1414 | ||
0a1b45a2 | 1415 | bool |
d7153c4a AM |
1416 | _bfd_elf_adjust_eh_frame_global_symbol (struct elf_link_hash_entry *h, |
1417 | void *arg ATTRIBUTE_UNUSED) | |
1418 | { | |
1419 | asection *sym_sec; | |
1420 | bfd_signed_vma delta; | |
1421 | ||
1422 | if (h->root.type != bfd_link_hash_defined | |
1423 | && h->root.type != bfd_link_hash_defweak) | |
0a1b45a2 | 1424 | return true; |
d7153c4a AM |
1425 | |
1426 | sym_sec = h->root.u.def.section; | |
1427 | if (sym_sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME | |
1428 | || elf_section_data (sym_sec)->sec_info == NULL) | |
0a1b45a2 | 1429 | return true; |
d7153c4a AM |
1430 | |
1431 | delta = offset_adjust (h->root.u.def.value, sym_sec); | |
1432 | h->root.u.def.value += delta; | |
1433 | ||
0a1b45a2 | 1434 | return true; |
d7153c4a AM |
1435 | } |
1436 | ||
1437 | /* The same for all local symbols defined in .eh_frame. Returns true | |
1438 | if any symbol was changed. */ | |
1439 | ||
1440 | static int | |
76c20d54 | 1441 | adjust_eh_frame_local_symbols (const asection *sec, |
d7153c4a AM |
1442 | struct elf_reloc_cookie *cookie) |
1443 | { | |
d7153c4a AM |
1444 | int adjusted = 0; |
1445 | ||
36f61bf2 AM |
1446 | if (cookie->locsymcount > 1) |
1447 | { | |
1448 | unsigned int shndx = elf_section_data (sec)->this_idx; | |
1449 | Elf_Internal_Sym *end_sym = cookie->locsyms + cookie->locsymcount; | |
1450 | Elf_Internal_Sym *sym; | |
d7153c4a | 1451 | |
36f61bf2 AM |
1452 | for (sym = cookie->locsyms + 1; sym < end_sym; ++sym) |
1453 | if (sym->st_info <= ELF_ST_INFO (STB_LOCAL, STT_OBJECT) | |
1454 | && sym->st_shndx == shndx) | |
d7153c4a | 1455 | { |
36f61bf2 AM |
1456 | bfd_signed_vma delta = offset_adjust (sym->st_value, sec); |
1457 | ||
1458 | if (delta != 0) | |
1459 | { | |
1460 | adjusted = 1; | |
1461 | sym->st_value += delta; | |
1462 | } | |
d7153c4a | 1463 | } |
36f61bf2 | 1464 | } |
d7153c4a AM |
1465 | return adjusted; |
1466 | } | |
1467 | ||
ca92cecb RS |
1468 | /* This function is called for each input file before the .eh_frame |
1469 | section is relocated. It discards duplicate CIEs and FDEs for discarded | |
1470 | functions. The function returns TRUE iff any entries have been | |
1471 | deleted. */ | |
1472 | ||
0a1b45a2 | 1473 | bool |
ca92cecb RS |
1474 | _bfd_elf_discard_section_eh_frame |
1475 | (bfd *abfd, struct bfd_link_info *info, asection *sec, | |
0a1b45a2 | 1476 | bool (*reloc_symbol_deleted_p) (bfd_vma, void *), |
ca92cecb RS |
1477 | struct elf_reloc_cookie *cookie) |
1478 | { | |
184d07da | 1479 | struct eh_cie_fde *ent; |
ca92cecb RS |
1480 | struct eh_frame_sec_info *sec_info; |
1481 | struct eh_frame_hdr_info *hdr_info; | |
2e0ce1c8 | 1482 | unsigned int ptr_size, offset, eh_alignment; |
d7153c4a | 1483 | int changed; |
ca92cecb | 1484 | |
dbaa2011 | 1485 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
0a1b45a2 | 1486 | return false; |
4d16d575 | 1487 | |
ca92cecb RS |
1488 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
1489 | if (sec_info == NULL) | |
0a1b45a2 | 1490 | return false; |
ca92cecb | 1491 | |
e41b3a13 JJ |
1492 | ptr_size = (get_elf_backend_data (sec->owner) |
1493 | ->elf_backend_eh_frame_address_size (sec->owner, sec)); | |
1494 | ||
ca92cecb | 1495 | hdr_info = &elf_hash_table (info)->eh_info; |
fda3ecf2 | 1496 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
f60e73e9 AM |
1497 | if (ent->size == 4) |
1498 | /* There should only be one zero terminator, on the last input | |
1499 | file supplying .eh_frame (crtend.o). Remove any others. */ | |
1500 | ent->removed = sec->map_head.s != NULL; | |
c2aaac08 | 1501 | else if (!ent->cie && ent->u.fde.cie_inf != NULL) |
fda3ecf2 | 1502 | { |
0a1b45a2 | 1503 | bool keep; |
e41b3a13 JJ |
1504 | if ((sec->flags & SEC_LINKER_CREATED) != 0 && cookie->rels == NULL) |
1505 | { | |
1506 | unsigned int width | |
1507 | = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1508 | bfd_vma value | |
1509 | = read_value (abfd, sec->contents + ent->offset + 8 + width, | |
1510 | width, get_DW_EH_PE_signed (ent->fde_encoding)); | |
1511 | keep = value != 0; | |
1512 | } | |
1513 | else | |
1514 | { | |
1515 | cookie->rel = cookie->rels + ent->reloc_index; | |
1516 | /* FIXME: octets_per_byte. */ | |
1517 | BFD_ASSERT (cookie->rel < cookie->relend | |
1518 | && cookie->rel->r_offset == ent->offset + 8); | |
1519 | keep = !(*reloc_symbol_deleted_p) (ent->offset + 8, cookie); | |
1520 | } | |
1521 | if (keep) | |
bce613b9 | 1522 | { |
0e1862bb | 1523 | if (bfd_link_pic (info) |
18e04883 | 1524 | && (((ent->fde_encoding & 0x70) == DW_EH_PE_absptr |
6b2cc140 | 1525 | && ent->make_relative == 0) |
18e04883 | 1526 | || (ent->fde_encoding & 0x70) == DW_EH_PE_aligned)) |
ca92cecb | 1527 | { |
83da6e74 NC |
1528 | static int num_warnings_issued = 0; |
1529 | ||
ca92cecb RS |
1530 | /* If a shared library uses absolute pointers |
1531 | which we cannot turn into PC relative, | |
1532 | don't create the binary search table, | |
1533 | since it is affected by runtime relocations. */ | |
0a1b45a2 | 1534 | hdr_info->u.dwarf.table = false; |
bce7c9d6 SL |
1535 | /* Only warn if --eh-frame-hdr was specified. */ |
1536 | if (info->eh_frame_hdr_type != 0) | |
83da6e74 | 1537 | { |
bce7c9d6 SL |
1538 | if (num_warnings_issued < 10) |
1539 | { | |
1540 | _bfd_error_handler | |
1541 | /* xgettext:c-format */ | |
1542 | (_("FDE encoding in %pB(%pA) prevents .eh_frame_hdr" | |
1543 | " table being created"), abfd, sec); | |
1544 | num_warnings_issued ++; | |
1545 | } | |
1546 | else if (num_warnings_issued == 10) | |
1547 | { | |
1548 | _bfd_error_handler | |
1549 | (_("further warnings about FDE encoding preventing .eh_frame_hdr generation dropped")); | |
1550 | num_warnings_issued ++; | |
1551 | } | |
83da6e74 | 1552 | } |
ca92cecb RS |
1553 | } |
1554 | ent->removed = 0; | |
2f0c68f2 | 1555 | hdr_info->u.dwarf.fde_count++; |
18e04883 RS |
1556 | ent->u.fde.cie_inf = find_merged_cie (abfd, info, sec, hdr_info, |
1557 | cookie, ent->u.fde.cie_inf); | |
bce613b9 | 1558 | } |
ca92cecb RS |
1559 | } |
1560 | ||
c9594989 AM |
1561 | free (sec_info->cies); |
1562 | sec_info->cies = NULL; | |
184d07da | 1563 | |
2e0ce1c8 AM |
1564 | /* It may be that some .eh_frame input section has greater alignment |
1565 | than other .eh_frame sections. In that case we run the risk of | |
1566 | padding with zeros before that section, which would be seen as a | |
1567 | zero terminator. Alignment padding must be added *inside* the | |
1568 | last FDE instead. For other FDEs we align according to their | |
1569 | encoding, in order to align FDE address range entries naturally. */ | |
ca92cecb | 1570 | offset = 0; |
d7153c4a | 1571 | changed = 0; |
ca92cecb RS |
1572 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
1573 | if (!ent->removed) | |
1574 | { | |
2e0ce1c8 AM |
1575 | eh_alignment = 4; |
1576 | if (ent->size == 4) | |
1577 | ; | |
1578 | else if (ent->cie) | |
1579 | { | |
1580 | if (ent->u.cie.per_encoding_aligned8) | |
1581 | eh_alignment = 8; | |
1582 | } | |
1583 | else | |
1584 | { | |
1585 | eh_alignment = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1586 | if (eh_alignment < 4) | |
1587 | eh_alignment = 4; | |
1588 | } | |
1589 | offset = (offset + eh_alignment - 1) & -eh_alignment; | |
353057a5 | 1590 | ent->new_offset = offset; |
d7153c4a AM |
1591 | if (ent->new_offset != ent->offset) |
1592 | changed = 1; | |
2e0ce1c8 | 1593 | offset += size_of_output_cie_fde (ent); |
fda3ecf2 | 1594 | } |
65765700 | 1595 | |
2e0ce1c8 | 1596 | eh_alignment = 4; |
2e0ce1c8 | 1597 | offset = (offset + eh_alignment - 1) & -eh_alignment; |
eea6121a | 1598 | sec->rawsize = sec->size; |
353057a5 | 1599 | sec->size = offset; |
d7153c4a AM |
1600 | if (sec->size != sec->rawsize) |
1601 | changed = 1; | |
1602 | ||
1603 | if (changed && adjust_eh_frame_local_symbols (sec, cookie)) | |
1604 | { | |
1605 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1606 | symtab_hdr->contents = (unsigned char *) cookie->locsyms; | |
1607 | } | |
1608 | return changed; | |
65765700 JJ |
1609 | } |
1610 | ||
1611 | /* This function is called for .eh_frame_hdr section after | |
1612 | _bfd_elf_discard_section_eh_frame has been called on all .eh_frame | |
1613 | input sections. It finalizes the size of .eh_frame_hdr section. */ | |
1614 | ||
0a1b45a2 | 1615 | bool |
8df52eee | 1616 | _bfd_elf_discard_section_eh_frame_hdr (struct bfd_link_info *info) |
65765700 | 1617 | { |
126495ed | 1618 | struct elf_link_hash_table *htab; |
65765700 | 1619 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 1620 | asection *sec; |
65765700 | 1621 | |
126495ed AM |
1622 | htab = elf_hash_table (info); |
1623 | hdr_info = &htab->eh_info; | |
bce613b9 | 1624 | |
2f0c68f2 | 1625 | if (!hdr_info->frame_hdr_is_compact && hdr_info->u.dwarf.cies != NULL) |
184d07da | 1626 | { |
2f0c68f2 CM |
1627 | htab_delete (hdr_info->u.dwarf.cies); |
1628 | hdr_info->u.dwarf.cies = NULL; | |
184d07da RS |
1629 | } |
1630 | ||
126495ed AM |
1631 | sec = hdr_info->hdr_sec; |
1632 | if (sec == NULL) | |
0a1b45a2 | 1633 | return false; |
126495ed | 1634 | |
2f0c68f2 CM |
1635 | if (info->eh_frame_hdr_type == COMPACT_EH_HDR) |
1636 | { | |
1637 | /* For compact frames we only add the header. The actual table comes | |
07d6d2b8 | 1638 | from the .eh_frame_entry sections. */ |
2f0c68f2 CM |
1639 | sec->size = 8; |
1640 | } | |
1641 | else | |
1642 | { | |
1643 | sec->size = EH_FRAME_HDR_SIZE; | |
1644 | if (hdr_info->u.dwarf.table) | |
1645 | sec->size += 4 + hdr_info->u.dwarf.fde_count * 8; | |
1646 | } | |
65765700 | 1647 | |
0a1b45a2 | 1648 | return true; |
65765700 JJ |
1649 | } |
1650 | ||
9a2a56cc AM |
1651 | /* Return true if there is at least one non-empty .eh_frame section in |
1652 | input files. Can only be called after ld has mapped input to | |
1653 | output sections, and before sections are stripped. */ | |
2f0c68f2 | 1654 | |
0a1b45a2 | 1655 | bool |
9a2a56cc AM |
1656 | _bfd_elf_eh_frame_present (struct bfd_link_info *info) |
1657 | { | |
1658 | asection *eh = bfd_get_section_by_name (info->output_bfd, ".eh_frame"); | |
1659 | ||
1660 | if (eh == NULL) | |
0a1b45a2 | 1661 | return false; |
9a2a56cc AM |
1662 | |
1663 | /* Count only sections which have at least a single CIE or FDE. | |
1664 | There cannot be any CIE or FDE <= 8 bytes. */ | |
1665 | for (eh = eh->map_head.s; eh != NULL; eh = eh->map_head.s) | |
1666 | if (eh->size > 8) | |
0a1b45a2 | 1667 | return true; |
9a2a56cc | 1668 | |
0a1b45a2 | 1669 | return false; |
9a2a56cc AM |
1670 | } |
1671 | ||
2f0c68f2 CM |
1672 | /* Return true if there is at least one .eh_frame_entry section in |
1673 | input files. */ | |
1674 | ||
0a1b45a2 | 1675 | bool |
2f0c68f2 CM |
1676 | _bfd_elf_eh_frame_entry_present (struct bfd_link_info *info) |
1677 | { | |
1678 | asection *o; | |
1679 | bfd *abfd; | |
1680 | ||
1681 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next) | |
1682 | { | |
1683 | for (o = abfd->sections; o; o = o->next) | |
1684 | { | |
fd361982 | 1685 | const char *name = bfd_section_name (o); |
2f0c68f2 CM |
1686 | |
1687 | if (strcmp (name, ".eh_frame_entry") | |
1688 | && !bfd_is_abs_section (o->output_section)) | |
0a1b45a2 | 1689 | return true; |
2f0c68f2 CM |
1690 | } |
1691 | } | |
0a1b45a2 | 1692 | return false; |
2f0c68f2 CM |
1693 | } |
1694 | ||
68f69152 JJ |
1695 | /* This function is called from size_dynamic_sections. |
1696 | It needs to decide whether .eh_frame_hdr should be output or not, | |
8423293d AM |
1697 | because when the dynamic symbol table has been sized it is too late |
1698 | to strip sections. */ | |
68f69152 | 1699 | |
0a1b45a2 | 1700 | bool |
c39a58e6 | 1701 | _bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info) |
68f69152 | 1702 | { |
126495ed | 1703 | struct elf_link_hash_table *htab; |
68f69152 | 1704 | struct eh_frame_hdr_info *hdr_info; |
2f0c68f2 CM |
1705 | struct bfd_link_hash_entry *bh = NULL; |
1706 | struct elf_link_hash_entry *h; | |
68f69152 | 1707 | |
126495ed AM |
1708 | htab = elf_hash_table (info); |
1709 | hdr_info = &htab->eh_info; | |
1710 | if (hdr_info->hdr_sec == NULL) | |
0a1b45a2 | 1711 | return true; |
68f69152 | 1712 | |
9a2a56cc | 1713 | if (bfd_is_abs_section (hdr_info->hdr_sec->output_section) |
2f0c68f2 CM |
1714 | || info->eh_frame_hdr_type == 0 |
1715 | || (info->eh_frame_hdr_type == DWARF2_EH_HDR | |
1716 | && !_bfd_elf_eh_frame_present (info)) | |
1717 | || (info->eh_frame_hdr_type == COMPACT_EH_HDR | |
1718 | && !_bfd_elf_eh_frame_entry_present (info))) | |
68f69152 | 1719 | { |
8423293d | 1720 | hdr_info->hdr_sec->flags |= SEC_EXCLUDE; |
126495ed | 1721 | hdr_info->hdr_sec = NULL; |
0a1b45a2 | 1722 | return true; |
68f69152 | 1723 | } |
126495ed | 1724 | |
2f0c68f2 CM |
1725 | /* Add a hidden symbol so that systems without access to PHDRs can |
1726 | find the table. */ | |
1727 | if (! (_bfd_generic_link_add_one_symbol | |
1728 | (info, info->output_bfd, "__GNU_EH_FRAME_HDR", BSF_LOCAL, | |
0a1b45a2 AM |
1729 | hdr_info->hdr_sec, 0, NULL, false, false, &bh))) |
1730 | return false; | |
2f0c68f2 CM |
1731 | |
1732 | h = (struct elf_link_hash_entry *) bh; | |
1733 | h->def_regular = 1; | |
1734 | h->other = STV_HIDDEN; | |
1735 | get_elf_backend_data | |
0a1b45a2 | 1736 | (info->output_bfd)->elf_backend_hide_symbol (info, h, true); |
2f0c68f2 CM |
1737 | |
1738 | if (!hdr_info->frame_hdr_is_compact) | |
0a1b45a2 AM |
1739 | hdr_info->u.dwarf.table = true; |
1740 | return true; | |
68f69152 JJ |
1741 | } |
1742 | ||
65765700 JJ |
1743 | /* Adjust an address in the .eh_frame section. Given OFFSET within |
1744 | SEC, this returns the new offset in the adjusted .eh_frame section, | |
1745 | or -1 if the address refers to a CIE/FDE which has been removed | |
1746 | or to offset with dynamic relocation which is no longer needed. */ | |
1747 | ||
1748 | bfd_vma | |
c39a58e6 | 1749 | _bfd_elf_eh_frame_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, |
3d540e93 | 1750 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
c39a58e6 AM |
1751 | asection *sec, |
1752 | bfd_vma offset) | |
65765700 JJ |
1753 | { |
1754 | struct eh_frame_sec_info *sec_info; | |
1755 | unsigned int lo, hi, mid; | |
1756 | ||
dbaa2011 | 1757 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
65765700 | 1758 | return offset; |
a50b1753 | 1759 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
65765700 | 1760 | |
eea6121a AM |
1761 | if (offset >= sec->rawsize) |
1762 | return offset - sec->rawsize + sec->size; | |
65765700 JJ |
1763 | |
1764 | lo = 0; | |
1765 | hi = sec_info->count; | |
1766 | mid = 0; | |
1767 | while (lo < hi) | |
1768 | { | |
1769 | mid = (lo + hi) / 2; | |
1770 | if (offset < sec_info->entry[mid].offset) | |
1771 | hi = mid; | |
1772 | else if (offset | |
1773 | >= sec_info->entry[mid].offset + sec_info->entry[mid].size) | |
1774 | lo = mid + 1; | |
1775 | else | |
1776 | break; | |
1777 | } | |
1778 | ||
1779 | BFD_ASSERT (lo < hi); | |
1780 | ||
1781 | /* FDE or CIE was removed. */ | |
1782 | if (sec_info->entry[mid].removed) | |
1783 | return (bfd_vma) -1; | |
1784 | ||
18e04883 RS |
1785 | /* If converting personality pointers to DW_EH_PE_pcrel, there will be |
1786 | no need for run-time relocation against the personality field. */ | |
1787 | if (sec_info->entry[mid].cie | |
1788 | && sec_info->entry[mid].u.cie.make_per_encoding_relative | |
1789 | && offset == (sec_info->entry[mid].offset + 8 | |
1790 | + sec_info->entry[mid].u.cie.personality_offset)) | |
1791 | return (bfd_vma) -2; | |
1792 | ||
65765700 JJ |
1793 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1794 | relocation against FDE's initial_location field. */ | |
fda3ecf2 | 1795 | if (!sec_info->entry[mid].cie |
6b2cc140 | 1796 | && sec_info->entry[mid].make_relative |
353057a5 RS |
1797 | && offset == sec_info->entry[mid].offset + 8) |
1798 | return (bfd_vma) -2; | |
65765700 | 1799 | |
9e2a4898 JJ |
1800 | /* If converting LSDA pointers to DW_EH_PE_pcrel, there will be no need |
1801 | for run-time relocation against LSDA field. */ | |
fda3ecf2 | 1802 | if (!sec_info->entry[mid].cie |
9f4b847e RS |
1803 | && sec_info->entry[mid].u.fde.cie_inf->u.cie.make_lsda_relative |
1804 | && offset == (sec_info->entry[mid].offset + 8 | |
1805 | + sec_info->entry[mid].lsda_offset)) | |
1806 | return (bfd_vma) -2; | |
9e2a4898 | 1807 | |
ac685e6a JJ |
1808 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1809 | relocation against DW_CFA_set_loc's arguments. */ | |
1810 | if (sec_info->entry[mid].set_loc | |
6b2cc140 | 1811 | && sec_info->entry[mid].make_relative |
ac685e6a JJ |
1812 | && (offset >= sec_info->entry[mid].offset + 8 |
1813 | + sec_info->entry[mid].set_loc[1])) | |
1814 | { | |
1815 | unsigned int cnt; | |
1816 | ||
1817 | for (cnt = 1; cnt <= sec_info->entry[mid].set_loc[0]; cnt++) | |
1818 | if (offset == sec_info->entry[mid].offset + 8 | |
1819 | + sec_info->entry[mid].set_loc[cnt]) | |
1820 | return (bfd_vma) -2; | |
1821 | } | |
1822 | ||
353057a5 | 1823 | /* Any new augmentation bytes go before the first relocation. */ |
c68836a9 | 1824 | return (offset + sec_info->entry[mid].new_offset |
353057a5 RS |
1825 | - sec_info->entry[mid].offset |
1826 | + extra_augmentation_string_bytes (sec_info->entry + mid) | |
1827 | + extra_augmentation_data_bytes (sec_info->entry + mid)); | |
65765700 JJ |
1828 | } |
1829 | ||
2f0c68f2 CM |
1830 | /* Write out .eh_frame_entry section. Add CANTUNWIND terminator if needed. |
1831 | Also check that the contents look sane. */ | |
1832 | ||
0a1b45a2 | 1833 | bool |
2f0c68f2 CM |
1834 | _bfd_elf_write_section_eh_frame_entry (bfd *abfd, struct bfd_link_info *info, |
1835 | asection *sec, bfd_byte *contents) | |
1836 | { | |
1837 | const struct elf_backend_data *bed; | |
1838 | bfd_byte cantunwind[8]; | |
1839 | bfd_vma addr; | |
1840 | bfd_vma last_addr; | |
1841 | bfd_vma offset; | |
1842 | asection *text_sec = (asection *) elf_section_data (sec)->sec_info; | |
1843 | ||
1844 | if (!sec->rawsize) | |
1845 | sec->rawsize = sec->size; | |
1846 | ||
1847 | BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_EH_FRAME_ENTRY); | |
1848 | ||
1849 | /* Check to make sure that the text section corresponding to this eh_frame_entry | |
1850 | section has not been excluded. In particular, mips16 stub entries will be | |
1851 | excluded outside of the normal process. */ | |
1852 | if (sec->flags & SEC_EXCLUDE | |
1853 | || text_sec->flags & SEC_EXCLUDE) | |
0a1b45a2 | 1854 | return true; |
2f0c68f2 CM |
1855 | |
1856 | if (!bfd_set_section_contents (abfd, sec->output_section, contents, | |
1857 | sec->output_offset, sec->rawsize)) | |
0a1b45a2 | 1858 | return false; |
2f0c68f2 CM |
1859 | |
1860 | last_addr = bfd_get_signed_32 (abfd, contents); | |
1861 | /* Check that all the entries are in order. */ | |
1862 | for (offset = 8; offset < sec->rawsize; offset += 8) | |
1863 | { | |
1864 | addr = bfd_get_signed_32 (abfd, contents + offset) + offset; | |
1865 | if (addr <= last_addr) | |
1866 | { | |
695344c0 | 1867 | /* xgettext:c-format */ |
871b3ab2 | 1868 | _bfd_error_handler (_("%pB: %pA not in order"), sec->owner, sec); |
0a1b45a2 | 1869 | return false; |
2f0c68f2 CM |
1870 | } |
1871 | ||
1872 | last_addr = addr; | |
1873 | } | |
1874 | ||
1875 | addr = text_sec->output_section->vma + text_sec->output_offset | |
1876 | + text_sec->size; | |
1877 | addr &= ~1; | |
1878 | addr -= (sec->output_section->vma + sec->output_offset + sec->rawsize); | |
1879 | if (addr & 1) | |
1880 | { | |
695344c0 | 1881 | /* xgettext:c-format */ |
871b3ab2 | 1882 | _bfd_error_handler (_("%pB: %pA invalid input section size"), |
dae82561 | 1883 | sec->owner, sec); |
2f0c68f2 | 1884 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 1885 | return false; |
2f0c68f2 CM |
1886 | } |
1887 | if (last_addr >= addr + sec->rawsize) | |
1888 | { | |
695344c0 | 1889 | /* xgettext:c-format */ |
871b3ab2 | 1890 | _bfd_error_handler (_("%pB: %pA points past end of text section"), |
dae82561 | 1891 | sec->owner, sec); |
2f0c68f2 | 1892 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 1893 | return false; |
2f0c68f2 CM |
1894 | } |
1895 | ||
1896 | if (sec->size == sec->rawsize) | |
0a1b45a2 | 1897 | return true; |
2f0c68f2 CM |
1898 | |
1899 | bed = get_elf_backend_data (abfd); | |
1900 | BFD_ASSERT (sec->size == sec->rawsize + 8); | |
1901 | BFD_ASSERT ((addr & 1) == 0); | |
1902 | BFD_ASSERT (bed->cant_unwind_opcode); | |
1903 | ||
1904 | bfd_put_32 (abfd, addr, cantunwind); | |
1905 | bfd_put_32 (abfd, (*bed->cant_unwind_opcode) (info), cantunwind + 4); | |
1906 | return bfd_set_section_contents (abfd, sec->output_section, cantunwind, | |
1907 | sec->output_offset + sec->rawsize, 8); | |
1908 | } | |
1909 | ||
65765700 JJ |
1910 | /* Write out .eh_frame section. This is called with the relocated |
1911 | contents. */ | |
1912 | ||
0a1b45a2 | 1913 | bool |
c39a58e6 AM |
1914 | _bfd_elf_write_section_eh_frame (bfd *abfd, |
1915 | struct bfd_link_info *info, | |
1916 | asection *sec, | |
1917 | bfd_byte *contents) | |
65765700 JJ |
1918 | { |
1919 | struct eh_frame_sec_info *sec_info; | |
126495ed | 1920 | struct elf_link_hash_table *htab; |
65765700 | 1921 | struct eh_frame_hdr_info *hdr_info; |
65765700 | 1922 | unsigned int ptr_size; |
2e0ce1c8 | 1923 | struct eh_cie_fde *ent, *last_ent; |
65765700 | 1924 | |
dbaa2011 | 1925 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
5dabe785 | 1926 | /* FIXME: octets_per_byte. */ |
c39a58e6 | 1927 | return bfd_set_section_contents (abfd, sec->output_section, contents, |
eea6121a | 1928 | sec->output_offset, sec->size); |
8c946ed5 RS |
1929 | |
1930 | ptr_size = (get_elf_backend_data (abfd) | |
1931 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
1932 | BFD_ASSERT (ptr_size != 0); | |
1933 | ||
a50b1753 | 1934 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
126495ed AM |
1935 | htab = elf_hash_table (info); |
1936 | hdr_info = &htab->eh_info; | |
3472e2e9 | 1937 | |
2f0c68f2 CM |
1938 | if (hdr_info->u.dwarf.table && hdr_info->u.dwarf.array == NULL) |
1939 | { | |
0a1b45a2 | 1940 | hdr_info->frame_hdr_is_compact = false; |
2f0c68f2 | 1941 | hdr_info->u.dwarf.array = (struct eh_frame_array_ent *) |
07d6d2b8 | 1942 | bfd_malloc (hdr_info->u.dwarf.fde_count |
2f0c68f2 CM |
1943 | * sizeof (*hdr_info->u.dwarf.array)); |
1944 | } | |
1945 | if (hdr_info->u.dwarf.array == NULL) | |
126495ed | 1946 | hdr_info = NULL; |
65765700 | 1947 | |
353057a5 RS |
1948 | /* The new offsets can be bigger or smaller than the original offsets. |
1949 | We therefore need to make two passes over the section: one backward | |
1950 | pass to move entries up and one forward pass to move entries down. | |
1951 | The two passes won't interfere with each other because entries are | |
1952 | not reordered */ | |
1953 | for (ent = sec_info->entry + sec_info->count; ent-- != sec_info->entry;) | |
1954 | if (!ent->removed && ent->new_offset > ent->offset) | |
fc802241 | 1955 | memmove (contents + ent->new_offset, contents + ent->offset, ent->size); |
353057a5 RS |
1956 | |
1957 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) | |
1958 | if (!ent->removed && ent->new_offset < ent->offset) | |
fc802241 | 1959 | memmove (contents + ent->new_offset, contents + ent->offset, ent->size); |
353057a5 | 1960 | |
2e0ce1c8 AM |
1961 | last_ent = sec_info->entry + sec_info->count; |
1962 | for (ent = sec_info->entry; ent < last_ent; ++ent) | |
65765700 | 1963 | { |
353057a5 RS |
1964 | unsigned char *buf, *end; |
1965 | unsigned int new_size; | |
1966 | ||
fda3ecf2 AM |
1967 | if (ent->removed) |
1968 | continue; | |
1969 | ||
353057a5 RS |
1970 | if (ent->size == 4) |
1971 | { | |
1972 | /* Any terminating FDE must be at the end of the section. */ | |
2e0ce1c8 | 1973 | BFD_ASSERT (ent == last_ent - 1); |
353057a5 RS |
1974 | continue; |
1975 | } | |
1976 | ||
fc802241 | 1977 | buf = contents + ent->new_offset; |
353057a5 | 1978 | end = buf + ent->size; |
2e0ce1c8 | 1979 | new_size = next_cie_fde_offset (ent, last_ent, sec) - ent->new_offset; |
353057a5 | 1980 | |
a34a056a L |
1981 | /* Update the size. It may be shrinked. */ |
1982 | bfd_put_32 (abfd, new_size - 4, buf); | |
1983 | ||
1984 | /* Filling the extra bytes with DW_CFA_nops. */ | |
353057a5 | 1985 | if (new_size != ent->size) |
a34a056a | 1986 | memset (end, 0, new_size - ent->size); |
353057a5 | 1987 | |
fda3ecf2 | 1988 | if (ent->cie) |
65765700 JJ |
1989 | { |
1990 | /* CIE */ | |
353057a5 | 1991 | if (ent->make_relative |
9f4b847e | 1992 | || ent->u.cie.make_lsda_relative |
6b2cc140 | 1993 | || ent->u.cie.per_encoding_relative) |
65765700 | 1994 | { |
f075ee0c | 1995 | char *aug; |
4ffd2909 | 1996 | unsigned int version, action, extra_string, extra_data; |
2c42be65 | 1997 | unsigned int per_width, per_encoding; |
65765700 | 1998 | |
9e2a4898 | 1999 | /* Need to find 'R' or 'L' augmentation's argument and modify |
65765700 | 2000 | DW_EH_PE_* value. */ |
353057a5 | 2001 | action = ((ent->make_relative ? 1 : 0) |
9f4b847e | 2002 | | (ent->u.cie.make_lsda_relative ? 2 : 0) |
6b2cc140 | 2003 | | (ent->u.cie.per_encoding_relative ? 4 : 0)); |
353057a5 RS |
2004 | extra_string = extra_augmentation_string_bytes (ent); |
2005 | extra_data = extra_augmentation_data_bytes (ent); | |
2006 | ||
4ffd2909 TC |
2007 | /* Skip length, id. */ |
2008 | buf += 8; | |
2009 | version = *buf++; | |
f075ee0c AM |
2010 | aug = (char *) buf; |
2011 | buf += strlen (aug) + 1; | |
2c42be65 RS |
2012 | skip_leb128 (&buf, end); |
2013 | skip_leb128 (&buf, end); | |
4ffd2909 TC |
2014 | if (version == 1) |
2015 | skip_bytes (&buf, end, 1); | |
2016 | else | |
2017 | skip_leb128 (&buf, end); | |
65765700 JJ |
2018 | if (*aug == 'z') |
2019 | { | |
353057a5 RS |
2020 | /* The uleb128 will always be a single byte for the kind |
2021 | of augmentation strings that we're prepared to handle. */ | |
2022 | *buf++ += extra_data; | |
65765700 JJ |
2023 | aug++; |
2024 | } | |
2025 | ||
353057a5 RS |
2026 | /* Make room for the new augmentation string and data bytes. */ |
2027 | memmove (buf + extra_string + extra_data, buf, end - buf); | |
f075ee0c | 2028 | memmove (aug + extra_string, aug, buf - (bfd_byte *) aug); |
353057a5 | 2029 | buf += extra_string; |
2c42be65 | 2030 | end += extra_string + extra_data; |
353057a5 RS |
2031 | |
2032 | if (ent->add_augmentation_size) | |
2033 | { | |
2034 | *aug++ = 'z'; | |
2035 | *buf++ = extra_data - 1; | |
2036 | } | |
6b2cc140 | 2037 | if (ent->u.cie.add_fde_encoding) |
353057a5 RS |
2038 | { |
2039 | BFD_ASSERT (action & 1); | |
2040 | *aug++ = 'R'; | |
30af5962 | 2041 | *buf++ = make_pc_relative (DW_EH_PE_absptr, ptr_size); |
353057a5 RS |
2042 | action &= ~1; |
2043 | } | |
2044 | ||
9e2a4898 | 2045 | while (action) |
65765700 JJ |
2046 | switch (*aug++) |
2047 | { | |
2048 | case 'L': | |
9e2a4898 JJ |
2049 | if (action & 2) |
2050 | { | |
fda3ecf2 | 2051 | BFD_ASSERT (*buf == ent->lsda_encoding); |
30af5962 | 2052 | *buf = make_pc_relative (*buf, ptr_size); |
9e2a4898 JJ |
2053 | action &= ~2; |
2054 | } | |
65765700 JJ |
2055 | buf++; |
2056 | break; | |
2057 | case 'P': | |
18e04883 | 2058 | if (ent->u.cie.make_per_encoding_relative) |
a10917ef | 2059 | *buf = make_pc_relative (*buf, ptr_size); |
65765700 | 2060 | per_encoding = *buf++; |
3472e2e9 | 2061 | per_width = get_DW_EH_PE_width (per_encoding, ptr_size); |
65765700 | 2062 | BFD_ASSERT (per_width != 0); |
09ae86c2 | 2063 | BFD_ASSERT (((per_encoding & 0x70) == DW_EH_PE_pcrel) |
6b2cc140 | 2064 | == ent->u.cie.per_encoding_relative); |
18e04883 | 2065 | if ((per_encoding & 0x70) == DW_EH_PE_aligned) |
65765700 JJ |
2066 | buf = (contents |
2067 | + ((buf - contents + per_width - 1) | |
2068 | & ~((bfd_size_type) per_width - 1))); | |
09ae86c2 JJ |
2069 | if (action & 4) |
2070 | { | |
fda3ecf2 AM |
2071 | bfd_vma val; |
2072 | ||
2073 | val = read_value (abfd, buf, per_width, | |
2074 | get_DW_EH_PE_signed (per_encoding)); | |
18e04883 RS |
2075 | if (ent->u.cie.make_per_encoding_relative) |
2076 | val -= (sec->output_section->vma | |
2077 | + sec->output_offset | |
2078 | + (buf - contents)); | |
2079 | else | |
2080 | { | |
2081 | val += (bfd_vma) ent->offset - ent->new_offset; | |
2082 | val -= extra_string + extra_data; | |
2083 | } | |
fda3ecf2 | 2084 | write_value (abfd, buf, val, per_width); |
09ae86c2 JJ |
2085 | action &= ~4; |
2086 | } | |
65765700 JJ |
2087 | buf += per_width; |
2088 | break; | |
9e2a4898 JJ |
2089 | case 'R': |
2090 | if (action & 1) | |
2091 | { | |
fda3ecf2 | 2092 | BFD_ASSERT (*buf == ent->fde_encoding); |
30af5962 | 2093 | *buf = make_pc_relative (*buf, ptr_size); |
9e2a4898 JJ |
2094 | action &= ~1; |
2095 | } | |
2096 | buf++; | |
2097 | break; | |
63752a75 JJ |
2098 | case 'S': |
2099 | break; | |
65765700 JJ |
2100 | default: |
2101 | BFD_FAIL (); | |
2102 | } | |
65765700 JJ |
2103 | } |
2104 | } | |
353057a5 | 2105 | else |
65765700 JJ |
2106 | { |
2107 | /* FDE */ | |
fda3ecf2 | 2108 | bfd_vma value, address; |
9e2a4898 | 2109 | unsigned int width; |
ac685e6a | 2110 | bfd_byte *start; |
155eaaa0 | 2111 | struct eh_cie_fde *cie; |
65765700 | 2112 | |
b34976b6 | 2113 | /* Skip length. */ |
155eaaa0 | 2114 | cie = ent->u.fde.cie_inf; |
65765700 | 2115 | buf += 4; |
fc802241 RS |
2116 | value = ((ent->new_offset + sec->output_offset + 4) |
2117 | - (cie->new_offset + cie->u.cie.u.sec->output_offset)); | |
fda3ecf2 | 2118 | bfd_put_32 (abfd, value, buf); |
0e1862bb | 2119 | if (bfd_link_relocatable (info)) |
5b69e357 | 2120 | continue; |
65765700 | 2121 | buf += 4; |
fda3ecf2 AM |
2122 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); |
2123 | value = read_value (abfd, buf, width, | |
2124 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
2125 | address = value; | |
9e2a4898 | 2126 | if (value) |
65765700 | 2127 | { |
18e04883 | 2128 | switch (ent->fde_encoding & 0x70) |
9e2a4898 | 2129 | { |
9e2a4898 JJ |
2130 | case DW_EH_PE_textrel: |
2131 | BFD_ASSERT (hdr_info == NULL); | |
2132 | break; | |
2133 | case DW_EH_PE_datarel: | |
2134 | { | |
cd9e734e AM |
2135 | switch (abfd->arch_info->arch) |
2136 | { | |
2137 | case bfd_arch_ia64: | |
2138 | BFD_ASSERT (elf_gp (abfd) != 0); | |
2139 | address += elf_gp (abfd); | |
2140 | break; | |
2141 | default: | |
9793eb77 AM |
2142 | _bfd_error_handler |
2143 | (_("DW_EH_PE_datarel unspecified" | |
2144 | " for this architecture")); | |
cd9e734e AM |
2145 | /* Fall thru */ |
2146 | case bfd_arch_frv: | |
2147 | case bfd_arch_i386: | |
e7cbe0c4 | 2148 | case bfd_arch_nios2: |
cd9e734e AM |
2149 | BFD_ASSERT (htab->hgot != NULL |
2150 | && ((htab->hgot->root.type | |
2151 | == bfd_link_hash_defined) | |
2152 | || (htab->hgot->root.type | |
2153 | == bfd_link_hash_defweak))); | |
2154 | address | |
2155 | += (htab->hgot->root.u.def.value | |
2156 | + htab->hgot->root.u.def.section->output_offset | |
2157 | + (htab->hgot->root.u.def.section->output_section | |
2158 | ->vma)); | |
2159 | break; | |
2160 | } | |
9e2a4898 JJ |
2161 | } |
2162 | break; | |
2163 | case DW_EH_PE_pcrel: | |
9c47c4c1 | 2164 | value += (bfd_vma) ent->offset - ent->new_offset; |
fc802241 RS |
2165 | address += (sec->output_section->vma |
2166 | + sec->output_offset | |
2167 | + ent->offset + 8); | |
9e2a4898 JJ |
2168 | break; |
2169 | } | |
6b2cc140 | 2170 | if (ent->make_relative) |
fc802241 RS |
2171 | value -= (sec->output_section->vma |
2172 | + sec->output_offset | |
2173 | + ent->new_offset + 8); | |
9e2a4898 | 2174 | write_value (abfd, buf, value, width); |
65765700 JJ |
2175 | } |
2176 | ||
ac685e6a JJ |
2177 | start = buf; |
2178 | ||
65765700 JJ |
2179 | if (hdr_info) |
2180 | { | |
cd9e734e AM |
2181 | /* The address calculation may overflow, giving us a |
2182 | value greater than 4G on a 32-bit target when | |
2183 | dwarf_vma is 64-bit. */ | |
2184 | if (sizeof (address) > 4 && ptr_size == 4) | |
2185 | address &= 0xffffffff; | |
2f0c68f2 CM |
2186 | hdr_info->u.dwarf.array[hdr_info->array_count].initial_loc |
2187 | = address; | |
2188 | hdr_info->u.dwarf.array[hdr_info->array_count].range | |
0a1b45a2 | 2189 | = read_value (abfd, buf + width, width, false); |
2f0c68f2 | 2190 | hdr_info->u.dwarf.array[hdr_info->array_count++].fde |
fc802241 RS |
2191 | = (sec->output_section->vma |
2192 | + sec->output_offset | |
2193 | + ent->new_offset); | |
65765700 | 2194 | } |
9e2a4898 | 2195 | |
18e04883 | 2196 | if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel |
9f4b847e | 2197 | || cie->u.cie.make_lsda_relative) |
9e2a4898 | 2198 | { |
fda3ecf2 AM |
2199 | buf += ent->lsda_offset; |
2200 | width = get_DW_EH_PE_width (ent->lsda_encoding, ptr_size); | |
84f97cb6 | 2201 | value = read_value (abfd, buf, width, |
fda3ecf2 | 2202 | get_DW_EH_PE_signed (ent->lsda_encoding)); |
9e2a4898 JJ |
2203 | if (value) |
2204 | { | |
18e04883 | 2205 | if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel) |
9c47c4c1 | 2206 | value += (bfd_vma) ent->offset - ent->new_offset; |
9f4b847e | 2207 | else if (cie->u.cie.make_lsda_relative) |
fc802241 RS |
2208 | value -= (sec->output_section->vma |
2209 | + sec->output_offset | |
2210 | + ent->new_offset + 8 + ent->lsda_offset); | |
9e2a4898 JJ |
2211 | write_value (abfd, buf, value, width); |
2212 | } | |
2213 | } | |
6b2cc140 | 2214 | else if (ent->add_augmentation_size) |
353057a5 RS |
2215 | { |
2216 | /* Skip the PC and length and insert a zero byte for the | |
2217 | augmentation size. */ | |
2218 | buf += width * 2; | |
2219 | memmove (buf + 1, buf, end - buf); | |
2220 | *buf = 0; | |
2221 | } | |
ac685e6a JJ |
2222 | |
2223 | if (ent->set_loc) | |
2224 | { | |
2225 | /* Adjust DW_CFA_set_loc. */ | |
91d6fa6a | 2226 | unsigned int cnt; |
ac685e6a JJ |
2227 | bfd_vma new_offset; |
2228 | ||
2229 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
2230 | new_offset = ent->new_offset + 8 | |
2231 | + extra_augmentation_string_bytes (ent) | |
2232 | + extra_augmentation_data_bytes (ent); | |
2233 | ||
2234 | for (cnt = 1; cnt <= ent->set_loc[0]; cnt++) | |
2235 | { | |
ac685e6a JJ |
2236 | buf = start + ent->set_loc[cnt]; |
2237 | ||
2238 | value = read_value (abfd, buf, width, | |
2239 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
2240 | if (!value) | |
2241 | continue; | |
2242 | ||
18e04883 | 2243 | if ((ent->fde_encoding & 0x70) == DW_EH_PE_pcrel) |
9c47c4c1 | 2244 | value += (bfd_vma) ent->offset + 8 - new_offset; |
6b2cc140 | 2245 | if (ent->make_relative) |
fc802241 RS |
2246 | value -= (sec->output_section->vma |
2247 | + sec->output_offset | |
2248 | + new_offset + ent->set_loc[cnt]); | |
ac685e6a JJ |
2249 | write_value (abfd, buf, value, width); |
2250 | } | |
2251 | } | |
65765700 | 2252 | } |
65765700 JJ |
2253 | } |
2254 | ||
5dabe785 | 2255 | /* FIXME: octets_per_byte. */ |
65765700 | 2256 | return bfd_set_section_contents (abfd, sec->output_section, |
3472e2e9 AM |
2257 | contents, (file_ptr) sec->output_offset, |
2258 | sec->size); | |
65765700 JJ |
2259 | } |
2260 | ||
2261 | /* Helper function used to sort .eh_frame_hdr search table by increasing | |
2262 | VMA of FDE initial location. */ | |
2263 | ||
2264 | static int | |
c39a58e6 | 2265 | vma_compare (const void *a, const void *b) |
65765700 | 2266 | { |
a50b1753 NC |
2267 | const struct eh_frame_array_ent *p = (const struct eh_frame_array_ent *) a; |
2268 | const struct eh_frame_array_ent *q = (const struct eh_frame_array_ent *) b; | |
65765700 JJ |
2269 | if (p->initial_loc > q->initial_loc) |
2270 | return 1; | |
2271 | if (p->initial_loc < q->initial_loc) | |
2272 | return -1; | |
c2aaac08 AM |
2273 | if (p->range > q->range) |
2274 | return 1; | |
2275 | if (p->range < q->range) | |
2276 | return -1; | |
65765700 JJ |
2277 | return 0; |
2278 | } | |
2279 | ||
2f0c68f2 CM |
2280 | /* Reorder .eh_frame_entry sections to match the associated text sections. |
2281 | This routine is called during the final linking step, just before writing | |
2282 | the contents. At this stage, sections in the eh_frame_hdr_info are already | |
2283 | sorted in order of increasing text section address and so we simply need | |
2284 | to make the .eh_frame_entrys follow that same order. Note that it is | |
2285 | invalid for a linker script to try to force a particular order of | |
2286 | .eh_frame_entry sections. */ | |
2287 | ||
0a1b45a2 | 2288 | bool |
2f0c68f2 CM |
2289 | _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *info) |
2290 | { | |
2291 | asection *sec = NULL; | |
2292 | asection *osec; | |
2293 | struct eh_frame_hdr_info *hdr_info; | |
2294 | unsigned int i; | |
2295 | bfd_vma offset; | |
2296 | struct bfd_link_order *p; | |
2297 | ||
2298 | hdr_info = &elf_hash_table (info)->eh_info; | |
2299 | ||
2300 | if (hdr_info->hdr_sec == NULL | |
2301 | || info->eh_frame_hdr_type != COMPACT_EH_HDR | |
2302 | || hdr_info->array_count == 0) | |
0a1b45a2 | 2303 | return true; |
2f0c68f2 CM |
2304 | |
2305 | /* Change section output offsets to be in text section order. */ | |
2306 | offset = 8; | |
2307 | osec = hdr_info->u.compact.entries[0]->output_section; | |
2308 | for (i = 0; i < hdr_info->array_count; i++) | |
2309 | { | |
2310 | sec = hdr_info->u.compact.entries[i]; | |
2311 | if (sec->output_section != osec) | |
2312 | { | |
4eca0228 | 2313 | _bfd_error_handler |
9793eb77 | 2314 | (_("invalid output section for .eh_frame_entry: %pA"), |
dae82561 | 2315 | sec->output_section); |
0a1b45a2 | 2316 | return false; |
2f0c68f2 CM |
2317 | } |
2318 | sec->output_offset = offset; | |
2319 | offset += sec->size; | |
2320 | } | |
2321 | ||
2322 | ||
2323 | /* Fix the link_order to match. */ | |
2324 | for (p = sec->output_section->map_head.link_order; p != NULL; p = p->next) | |
2325 | { | |
2326 | if (p->type != bfd_indirect_link_order) | |
2327 | abort(); | |
2328 | ||
2329 | p->offset = p->u.indirect.section->output_offset; | |
2330 | if (p->next != NULL) | |
07d6d2b8 | 2331 | i--; |
2f0c68f2 CM |
2332 | } |
2333 | ||
2334 | if (i != 0) | |
2335 | { | |
4eca0228 | 2336 | _bfd_error_handler |
9793eb77 | 2337 | (_("invalid contents in %pA section"), osec); |
0a1b45a2 | 2338 | return false; |
2f0c68f2 CM |
2339 | } |
2340 | ||
0a1b45a2 | 2341 | return true; |
2f0c68f2 CM |
2342 | } |
2343 | ||
2344 | /* The .eh_frame_hdr format for Compact EH frames: | |
2345 | ubyte version (2) | |
2346 | ubyte eh_ref_enc (DW_EH_PE_* encoding of typinfo references) | |
2347 | uint32_t count (Number of entries in table) | |
2348 | [array from .eh_frame_entry sections] */ | |
2349 | ||
0a1b45a2 | 2350 | static bool |
2f0c68f2 CM |
2351 | write_compact_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
2352 | { | |
2353 | struct elf_link_hash_table *htab; | |
2354 | struct eh_frame_hdr_info *hdr_info; | |
2355 | asection *sec; | |
2356 | const struct elf_backend_data *bed; | |
2357 | bfd_vma count; | |
2358 | bfd_byte contents[8]; | |
2359 | unsigned int i; | |
2360 | ||
2361 | htab = elf_hash_table (info); | |
2362 | hdr_info = &htab->eh_info; | |
2363 | sec = hdr_info->hdr_sec; | |
2364 | ||
2365 | if (sec->size != 8) | |
2366 | abort(); | |
2367 | ||
2368 | for (i = 0; i < sizeof (contents); i++) | |
2369 | contents[i] = 0; | |
2370 | ||
2371 | contents[0] = COMPACT_EH_HDR; | |
2372 | bed = get_elf_backend_data (abfd); | |
2373 | ||
2374 | BFD_ASSERT (bed->compact_eh_encoding); | |
2375 | contents[1] = (*bed->compact_eh_encoding) (info); | |
2376 | ||
2377 | count = (sec->output_section->size - 8) / 8; | |
2378 | bfd_put_32 (abfd, count, contents + 4); | |
2379 | return bfd_set_section_contents (abfd, sec->output_section, contents, | |
2380 | (file_ptr) sec->output_offset, sec->size); | |
2381 | } | |
2382 | ||
2383 | /* The .eh_frame_hdr format for DWARF frames: | |
2384 | ||
65765700 | 2385 | ubyte version (currently 1) |
07d6d2b8 | 2386 | ubyte eh_frame_ptr_enc (DW_EH_PE_* encoding of pointer to start of |
65765700 JJ |
2387 | .eh_frame section) |
2388 | ubyte fde_count_enc (DW_EH_PE_* encoding of total FDE count | |
2389 | number (or DW_EH_PE_omit if there is no | |
2390 | binary search table computed)) | |
2391 | ubyte table_enc (DW_EH_PE_* encoding of binary search table, | |
2392 | or DW_EH_PE_omit if not present. | |
2393 | DW_EH_PE_datarel is using address of | |
2394 | .eh_frame_hdr section start as base) | |
2395 | [encoded] eh_frame_ptr (pointer to start of .eh_frame section) | |
2396 | optionally followed by: | |
2397 | [encoded] fde_count (total number of FDEs in .eh_frame section) | |
2398 | fde_count x [encoded] initial_loc, fde | |
2399 | (array of encoded pairs containing | |
2400 | FDE initial_location field and FDE address, | |
5ed6aba4 | 2401 | sorted by increasing initial_loc). */ |
65765700 | 2402 | |
0a1b45a2 | 2403 | static bool |
2f0c68f2 | 2404 | write_dwarf_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
65765700 | 2405 | { |
126495ed | 2406 | struct elf_link_hash_table *htab; |
65765700 | 2407 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 2408 | asection *sec; |
0a1b45a2 | 2409 | bool retval = true; |
65765700 | 2410 | |
126495ed AM |
2411 | htab = elf_hash_table (info); |
2412 | hdr_info = &htab->eh_info; | |
2413 | sec = hdr_info->hdr_sec; | |
2f0c68f2 CM |
2414 | bfd_byte *contents; |
2415 | asection *eh_frame_sec; | |
2416 | bfd_size_type size; | |
2417 | bfd_vma encoded_eh_frame; | |
2418 | ||
2419 | size = EH_FRAME_HDR_SIZE; | |
2420 | if (hdr_info->u.dwarf.array | |
2421 | && hdr_info->array_count == hdr_info->u.dwarf.fde_count) | |
2422 | size += 4 + hdr_info->u.dwarf.fde_count * 8; | |
2423 | contents = (bfd_byte *) bfd_malloc (size); | |
2424 | if (contents == NULL) | |
0a1b45a2 | 2425 | return false; |
65765700 | 2426 | |
2f0c68f2 CM |
2427 | eh_frame_sec = bfd_get_section_by_name (abfd, ".eh_frame"); |
2428 | if (eh_frame_sec == NULL) | |
5ed6aba4 | 2429 | { |
2f0c68f2 | 2430 | free (contents); |
0a1b45a2 | 2431 | return false; |
2f0c68f2 | 2432 | } |
65765700 | 2433 | |
2f0c68f2 CM |
2434 | memset (contents, 0, EH_FRAME_HDR_SIZE); |
2435 | /* Version. */ | |
2436 | contents[0] = 1; | |
2437 | /* .eh_frame offset. */ | |
2438 | contents[1] = get_elf_backend_data (abfd)->elf_backend_encode_eh_address | |
2439 | (abfd, info, eh_frame_sec, 0, sec, 4, &encoded_eh_frame); | |
ec3391e7 | 2440 | |
2f0c68f2 CM |
2441 | if (hdr_info->u.dwarf.array |
2442 | && hdr_info->array_count == hdr_info->u.dwarf.fde_count) | |
2443 | { | |
2444 | /* FDE count encoding. */ | |
2445 | contents[2] = DW_EH_PE_udata4; | |
2446 | /* Search table encoding. */ | |
2447 | contents[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4; | |
2448 | } | |
2449 | else | |
2450 | { | |
2451 | contents[2] = DW_EH_PE_omit; | |
2452 | contents[3] = DW_EH_PE_omit; | |
2453 | } | |
2454 | bfd_put_32 (abfd, encoded_eh_frame, contents + 4); | |
ec3391e7 | 2455 | |
2f0c68f2 CM |
2456 | if (contents[2] != DW_EH_PE_omit) |
2457 | { | |
2458 | unsigned int i; | |
0a1b45a2 | 2459 | bool overlap, overflow; |
2f0c68f2 CM |
2460 | |
2461 | bfd_put_32 (abfd, hdr_info->u.dwarf.fde_count, | |
2462 | contents + EH_FRAME_HDR_SIZE); | |
2463 | qsort (hdr_info->u.dwarf.array, hdr_info->u.dwarf.fde_count, | |
2464 | sizeof (*hdr_info->u.dwarf.array), vma_compare); | |
0a1b45a2 AM |
2465 | overlap = false; |
2466 | overflow = false; | |
2f0c68f2 | 2467 | for (i = 0; i < hdr_info->u.dwarf.fde_count; i++) |
9f7c3e5e | 2468 | { |
2f0c68f2 CM |
2469 | bfd_vma val; |
2470 | ||
2471 | val = hdr_info->u.dwarf.array[i].initial_loc | |
2472 | - sec->output_section->vma; | |
2473 | val = ((val & 0xffffffff) ^ 0x80000000) - 0x80000000; | |
2474 | if (elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64 | |
2475 | && (hdr_info->u.dwarf.array[i].initial_loc | |
2476 | != sec->output_section->vma + val)) | |
0a1b45a2 | 2477 | overflow = true; |
2f0c68f2 CM |
2478 | bfd_put_32 (abfd, val, contents + EH_FRAME_HDR_SIZE + i * 8 + 4); |
2479 | val = hdr_info->u.dwarf.array[i].fde - sec->output_section->vma; | |
2480 | val = ((val & 0xffffffff) ^ 0x80000000) - 0x80000000; | |
2481 | if (elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64 | |
2482 | && (hdr_info->u.dwarf.array[i].fde | |
2483 | != sec->output_section->vma + val)) | |
0a1b45a2 | 2484 | overflow = true; |
2f0c68f2 CM |
2485 | bfd_put_32 (abfd, val, contents + EH_FRAME_HDR_SIZE + i * 8 + 8); |
2486 | if (i != 0 | |
2487 | && (hdr_info->u.dwarf.array[i].initial_loc | |
2488 | < (hdr_info->u.dwarf.array[i - 1].initial_loc | |
2489 | + hdr_info->u.dwarf.array[i - 1].range))) | |
0a1b45a2 | 2490 | overlap = true; |
9f7c3e5e | 2491 | } |
2f0c68f2 | 2492 | if (overflow) |
9793eb77 | 2493 | _bfd_error_handler (_(".eh_frame_hdr entry overflow")); |
2f0c68f2 | 2494 | if (overlap) |
9793eb77 | 2495 | _bfd_error_handler (_(".eh_frame_hdr refers to overlapping FDEs")); |
2f0c68f2 | 2496 | if (overflow || overlap) |
9f7c3e5e | 2497 | { |
2f0c68f2 | 2498 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 2499 | retval = false; |
9f7c3e5e | 2500 | } |
2f0c68f2 | 2501 | } |
65765700 | 2502 | |
2f0c68f2 CM |
2503 | /* FIXME: octets_per_byte. */ |
2504 | if (!bfd_set_section_contents (abfd, sec->output_section, contents, | |
2505 | (file_ptr) sec->output_offset, | |
2506 | sec->size)) | |
0a1b45a2 | 2507 | retval = false; |
2f0c68f2 CM |
2508 | free (contents); |
2509 | ||
c9594989 | 2510 | free (hdr_info->u.dwarf.array); |
2f0c68f2 CM |
2511 | return retval; |
2512 | } | |
9f7c3e5e | 2513 | |
2f0c68f2 CM |
2514 | /* Write out .eh_frame_hdr section. This must be called after |
2515 | _bfd_elf_write_section_eh_frame has been called on all input | |
2516 | .eh_frame sections. */ | |
ae6c7e33 | 2517 | |
0a1b45a2 | 2518 | bool |
2f0c68f2 CM |
2519 | _bfd_elf_write_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
2520 | { | |
2521 | struct elf_link_hash_table *htab; | |
2522 | struct eh_frame_hdr_info *hdr_info; | |
2523 | asection *sec; | |
aa8f4d1e | 2524 | |
2f0c68f2 CM |
2525 | htab = elf_hash_table (info); |
2526 | hdr_info = &htab->eh_info; | |
2527 | sec = hdr_info->hdr_sec; | |
65765700 | 2528 | |
2f0c68f2 | 2529 | if (info->eh_frame_hdr_type == 0 || sec == NULL) |
0a1b45a2 | 2530 | return true; |
2f0c68f2 CM |
2531 | |
2532 | if (info->eh_frame_hdr_type == COMPACT_EH_HDR) | |
2533 | return write_compact_eh_frame_hdr (abfd, info); | |
2534 | else | |
2535 | return write_dwarf_eh_frame_hdr (abfd, info); | |
65765700 | 2536 | } |
ec3391e7 | 2537 | |
8c946ed5 RS |
2538 | /* Return the width of FDE addresses. This is the default implementation. */ |
2539 | ||
2540 | unsigned int | |
76c20d54 | 2541 | _bfd_elf_eh_frame_address_size (bfd *abfd, const asection *sec ATTRIBUTE_UNUSED) |
8c946ed5 RS |
2542 | { |
2543 | return elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64 ? 8 : 4; | |
2544 | } | |
2545 | ||
ec3391e7 AO |
2546 | /* Decide whether we can use a PC-relative encoding within the given |
2547 | EH frame section. This is the default implementation. */ | |
2548 | ||
0a1b45a2 | 2549 | bool |
ec3391e7 AO |
2550 | _bfd_elf_can_make_relative (bfd *input_bfd ATTRIBUTE_UNUSED, |
2551 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
2552 | asection *eh_frame_section ATTRIBUTE_UNUSED) | |
2553 | { | |
0a1b45a2 | 2554 | return true; |
ec3391e7 AO |
2555 | } |
2556 | ||
2557 | /* Select an encoding for the given address. Preference is given to | |
2558 | PC-relative addressing modes. */ | |
2559 | ||
2560 | bfd_byte | |
2561 | _bfd_elf_encode_eh_address (bfd *abfd ATTRIBUTE_UNUSED, | |
2562 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
2563 | asection *osec, bfd_vma offset, | |
2564 | asection *loc_sec, bfd_vma loc_offset, | |
2565 | bfd_vma *encoded) | |
2566 | { | |
2567 | *encoded = osec->vma + offset - | |
2568 | (loc_sec->output_section->vma + loc_sec->output_offset + loc_offset); | |
2569 | return DW_EH_PE_pcrel | DW_EH_PE_sdata4; | |
2570 | } |