Commit | Line | Data |
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65765700 | 1 | /* .eh_frame section optimization. |
2571583a | 2 | Copyright (C) 2001-2017 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 | ||
63 | static inline bfd_boolean | |
64 | read_byte (bfd_byte **iter, bfd_byte *end, unsigned char *result) | |
65 | { | |
66 | if (*iter >= end) | |
67 | return FALSE; | |
68 | *result = *((*iter)++); | |
69 | return TRUE; | |
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 | ||
75 | static inline bfd_boolean | |
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; | |
81 | return FALSE; | |
82 | } | |
83 | *iter += length; | |
84 | return TRUE; | |
85 | } | |
86 | ||
87 | /* Move *ITER over an leb128, stopping at END. Return true if the end | |
88 | of the leb128 was found. */ | |
89 | ||
90 | static bfd_boolean | |
91 | skip_leb128 (bfd_byte **iter, bfd_byte *end) | |
92 | { | |
93 | unsigned char byte; | |
94 | do | |
95 | if (!read_byte (iter, end, &byte)) | |
96 | return FALSE; | |
97 | while (byte & 0x80); | |
98 | return TRUE; | |
99 | } | |
100 | ||
101 | /* Like skip_leb128, but treat the leb128 as an unsigned value and | |
102 | store it in *VALUE. */ | |
103 | ||
104 | static bfd_boolean | |
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)) | |
111 | return FALSE; | |
112 | ||
113 | p = *iter; | |
114 | *value = *--p; | |
115 | while (p > start) | |
116 | *value = (*value << 7) | (*--p & 0x7f); | |
117 | ||
118 | return TRUE; | |
119 | } | |
120 | ||
121 | /* Like read_uleb128, but for signed values. */ | |
122 | ||
123 | static bfd_boolean | |
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)) | |
130 | return FALSE; | |
131 | ||
132 | p = *iter; | |
133 | *value = ((*--p & 0x7f) ^ 0x40) - 0x40; | |
134 | while (p > start) | |
135 | *value = (*value << 7) | (*--p & 0x7f); | |
136 | ||
137 | return TRUE; | |
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 | ||
285 | static INLINE unsigned int | |
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 | ||
301 | static INLINE unsigned int | |
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 | ||
345 | static bfd_boolean | |
346 | skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) | |
347 | { | |
348 | bfd_byte op; | |
349 | bfd_vma length; | |
350 | ||
351 | if (!read_byte (iter, end, &op)) | |
352 | return FALSE; | |
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 RS |
362 | /* No arguments. */ |
363 | return TRUE; | |
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: | |
416 | return FALSE; | |
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 | { | |
500 | hdr_info->frame_hdr_is_compact = TRUE; | |
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 | ||
524 | bfd_boolean | |
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 | { | |
539 | return TRUE; | |
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. */ | |
546 | return TRUE; | |
547 | } | |
548 | ||
549 | if (cookie->rel == cookie->relend) | |
550 | return FALSE; | |
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) | |
555 | return FALSE; | |
556 | ||
557 | text_sec = _bfd_elf_section_for_symbol (cookie, r_symndx, FALSE); | |
558 | ||
559 | if (text_sec == NULL) | |
560 | return FALSE; | |
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); | |
570 | return TRUE; | |
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 |
dbaa2011 | 605 | || sec->sec_info_type != SEC_INFO_TYPE_NONE) |
65765700 JJ |
606 | { |
607 | /* This file does not contain .eh_frame information. */ | |
ca92cecb | 608 | return; |
65765700 JJ |
609 | } |
610 | ||
e460dd0d | 611 | if (bfd_is_abs_section (sec->output_section)) |
65765700 JJ |
612 | { |
613 | /* At least one of the sections is being discarded from the | |
3472e2e9 | 614 | link, so we should just ignore them. */ |
ca92cecb | 615 | return; |
65765700 JJ |
616 | } |
617 | ||
618 | /* Read the frame unwind information from abfd. */ | |
619 | ||
acfe5567 | 620 | REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf)); |
68f69152 | 621 | |
65765700 JJ |
622 | /* If .eh_frame section size doesn't fit into int, we cannot handle |
623 | it (it would need to use 64-bit .eh_frame format anyway). */ | |
acfe5567 | 624 | REQUIRE (sec->size == (unsigned int) sec->size); |
65765700 | 625 | |
8c946ed5 RS |
626 | ptr_size = (get_elf_backend_data (abfd) |
627 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
628 | REQUIRE (ptr_size != 0); | |
629 | ||
ca92cecb RS |
630 | /* Go through the section contents and work out how many FDEs and |
631 | CIEs there are. */ | |
65765700 | 632 | buf = ehbuf; |
ca92cecb RS |
633 | end = ehbuf + sec->size; |
634 | num_cies = 0; | |
635 | num_entries = 0; | |
636 | while (buf != end) | |
637 | { | |
638 | num_entries++; | |
639 | ||
640 | /* Read the length of the entry. */ | |
641 | REQUIRE (skip_bytes (&buf, end, 4)); | |
642 | hdr_length = bfd_get_32 (abfd, buf - 4); | |
643 | ||
644 | /* 64-bit .eh_frame is not supported. */ | |
645 | REQUIRE (hdr_length != 0xffffffff); | |
646 | if (hdr_length == 0) | |
647 | break; | |
648 | ||
649 | REQUIRE (skip_bytes (&buf, end, 4)); | |
650 | hdr_id = bfd_get_32 (abfd, buf - 4); | |
651 | if (hdr_id == 0) | |
652 | num_cies++; | |
653 | ||
654 | REQUIRE (skip_bytes (&buf, end, hdr_length - 4)); | |
655 | } | |
656 | ||
a50b1753 NC |
657 | sec_info = (struct eh_frame_sec_info *) |
658 | bfd_zmalloc (sizeof (struct eh_frame_sec_info) | |
07d6d2b8 | 659 | + (num_entries - 1) * sizeof (struct eh_cie_fde)); |
acfe5567 | 660 | REQUIRE (sec_info); |
eea6121a | 661 | |
184d07da | 662 | /* We need to have a "struct cie" for each CIE in this section. */ |
9866ffe2 AM |
663 | if (num_cies) |
664 | { | |
665 | local_cies = (struct cie *) bfd_zmalloc (num_cies * sizeof (*local_cies)); | |
666 | REQUIRE (local_cies); | |
667 | } | |
65765700 | 668 | |
5dabe785 | 669 | /* FIXME: octets_per_byte. */ |
65765700 | 670 | #define ENSURE_NO_RELOCS(buf) \ |
5b69e357 AM |
671 | while (cookie->rel < cookie->relend \ |
672 | && (cookie->rel->r_offset \ | |
673 | < (bfd_size_type) ((buf) - ehbuf))) \ | |
674 | { \ | |
675 | REQUIRE (cookie->rel->r_info == 0); \ | |
676 | cookie->rel++; \ | |
677 | } | |
65765700 | 678 | |
5dabe785 | 679 | /* FIXME: octets_per_byte. */ |
65765700 JJ |
680 | #define SKIP_RELOCS(buf) \ |
681 | while (cookie->rel < cookie->relend \ | |
3472e2e9 | 682 | && (cookie->rel->r_offset \ |
65765700 JJ |
683 | < (bfd_size_type) ((buf) - ehbuf))) \ |
684 | cookie->rel++ | |
685 | ||
5dabe785 | 686 | /* FIXME: octets_per_byte. */ |
65765700 JJ |
687 | #define GET_RELOC(buf) \ |
688 | ((cookie->rel < cookie->relend \ | |
689 | && (cookie->rel->r_offset \ | |
3472e2e9 | 690 | == (bfd_size_type) ((buf) - ehbuf))) \ |
65765700 JJ |
691 | ? cookie->rel : NULL) |
692 | ||
ca92cecb | 693 | buf = ehbuf; |
184d07da | 694 | cie_count = 0; |
9d0a14d3 | 695 | gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook; |
ca92cecb | 696 | while ((bfd_size_type) (buf - ehbuf) != sec->size) |
65765700 | 697 | { |
f075ee0c | 698 | char *aug; |
ca92cecb | 699 | bfd_byte *start, *insns, *insns_end; |
2c42be65 | 700 | bfd_size_type length; |
ac685e6a | 701 | unsigned int set_loc_count; |
65765700 | 702 | |
fda3ecf2 | 703 | this_inf = sec_info->entry + sec_info->count; |
65765700 | 704 | last_fde = buf; |
bce613b9 | 705 | |
bce613b9 JJ |
706 | /* Read the length of the entry. */ |
707 | REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); | |
708 | hdr_length = bfd_get_32 (abfd, buf - 4); | |
acfe5567 | 709 | |
bce613b9 JJ |
710 | /* The CIE/FDE must be fully contained in this input section. */ |
711 | REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr_length <= sec->size); | |
712 | end = buf + hdr_length; | |
65765700 | 713 | |
bce613b9 JJ |
714 | this_inf->offset = last_fde - ehbuf; |
715 | this_inf->size = 4 + hdr_length; | |
155eaaa0 | 716 | this_inf->reloc_index = cookie->rel - cookie->rels; |
bce613b9 JJ |
717 | |
718 | if (hdr_length == 0) | |
719 | { | |
720 | /* A zero-length CIE should only be found at the end of | |
9866ffe2 AM |
721 | the section, but allow multiple terminators. */ |
722 | while (skip_bytes (&buf, ehbuf + sec->size, 4)) | |
723 | REQUIRE (bfd_get_32 (abfd, buf - 4) == 0); | |
bce613b9 JJ |
724 | REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); |
725 | ENSURE_NO_RELOCS (buf); | |
726 | sec_info->count++; | |
727 | break; | |
65765700 JJ |
728 | } |
729 | ||
bce613b9 JJ |
730 | REQUIRE (skip_bytes (&buf, end, 4)); |
731 | hdr_id = bfd_get_32 (abfd, buf - 4); | |
732 | ||
733 | if (hdr_id == 0) | |
65765700 JJ |
734 | { |
735 | unsigned int initial_insn_length; | |
736 | ||
737 | /* CIE */ | |
bce613b9 JJ |
738 | this_inf->cie = 1; |
739 | ||
184d07da RS |
740 | /* Point CIE to one of the section-local cie structures. */ |
741 | cie = local_cies + cie_count++; | |
742 | ||
ca92cecb | 743 | cie->cie_inf = this_inf; |
bce613b9 | 744 | cie->length = hdr_length; |
ac685e6a | 745 | start = buf; |
bce613b9 | 746 | REQUIRE (read_byte (&buf, end, &cie->version)); |
65765700 JJ |
747 | |
748 | /* Cannot handle unknown versions. */ | |
604282a7 JJ |
749 | REQUIRE (cie->version == 1 |
750 | || cie->version == 3 | |
751 | || cie->version == 4); | |
bce613b9 | 752 | REQUIRE (strlen ((char *) buf) < sizeof (cie->augmentation)); |
65765700 | 753 | |
bce613b9 | 754 | strcpy (cie->augmentation, (char *) buf); |
f075ee0c | 755 | buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1; |
d7153c4a | 756 | this_inf->u.cie.aug_str_len = buf - start - 1; |
65765700 JJ |
757 | ENSURE_NO_RELOCS (buf); |
758 | if (buf[0] == 'e' && buf[1] == 'h') | |
759 | { | |
760 | /* GCC < 3.0 .eh_frame CIE */ | |
761 | /* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__ | |
762 | is private to each CIE, so we don't need it for anything. | |
763 | Just skip it. */ | |
2c42be65 | 764 | REQUIRE (skip_bytes (&buf, end, ptr_size)); |
65765700 JJ |
765 | SKIP_RELOCS (buf); |
766 | } | |
604282a7 JJ |
767 | if (cie->version >= 4) |
768 | { | |
769 | REQUIRE (buf + 1 < end); | |
770 | REQUIRE (buf[0] == ptr_size); | |
771 | REQUIRE (buf[1] == 0); | |
772 | buf += 2; | |
773 | } | |
bce613b9 JJ |
774 | REQUIRE (read_uleb128 (&buf, end, &cie->code_align)); |
775 | REQUIRE (read_sleb128 (&buf, end, &cie->data_align)); | |
776 | if (cie->version == 1) | |
2c42be65 RS |
777 | { |
778 | REQUIRE (buf < end); | |
bce613b9 | 779 | cie->ra_column = *buf++; |
2c42be65 | 780 | } |
0da76f83 | 781 | else |
bce613b9 | 782 | REQUIRE (read_uleb128 (&buf, end, &cie->ra_column)); |
65765700 | 783 | ENSURE_NO_RELOCS (buf); |
bce613b9 JJ |
784 | cie->lsda_encoding = DW_EH_PE_omit; |
785 | cie->fde_encoding = DW_EH_PE_omit; | |
786 | cie->per_encoding = DW_EH_PE_omit; | |
787 | aug = cie->augmentation; | |
65765700 JJ |
788 | if (aug[0] != 'e' || aug[1] != 'h') |
789 | { | |
790 | if (*aug == 'z') | |
791 | { | |
792 | aug++; | |
bce613b9 | 793 | REQUIRE (read_uleb128 (&buf, end, &cie->augmentation_size)); |
07d6d2b8 | 794 | ENSURE_NO_RELOCS (buf); |
65765700 JJ |
795 | } |
796 | ||
797 | while (*aug != '\0') | |
798 | switch (*aug++) | |
799 | { | |
800 | case 'L': | |
bce613b9 | 801 | REQUIRE (read_byte (&buf, end, &cie->lsda_encoding)); |
65765700 | 802 | ENSURE_NO_RELOCS (buf); |
bce613b9 | 803 | REQUIRE (get_DW_EH_PE_width (cie->lsda_encoding, ptr_size)); |
65765700 JJ |
804 | break; |
805 | case 'R': | |
bce613b9 | 806 | REQUIRE (read_byte (&buf, end, &cie->fde_encoding)); |
65765700 | 807 | ENSURE_NO_RELOCS (buf); |
bce613b9 | 808 | REQUIRE (get_DW_EH_PE_width (cie->fde_encoding, ptr_size)); |
65765700 | 809 | break; |
63752a75 JJ |
810 | case 'S': |
811 | break; | |
65765700 JJ |
812 | case 'P': |
813 | { | |
814 | int per_width; | |
815 | ||
bce613b9 JJ |
816 | REQUIRE (read_byte (&buf, end, &cie->per_encoding)); |
817 | per_width = get_DW_EH_PE_width (cie->per_encoding, | |
65765700 | 818 | ptr_size); |
acfe5567 | 819 | REQUIRE (per_width); |
18e04883 | 820 | if ((cie->per_encoding & 0x70) == DW_EH_PE_aligned) |
2c42be65 RS |
821 | { |
822 | length = -(buf - ehbuf) & (per_width - 1); | |
823 | REQUIRE (skip_bytes (&buf, end, length)); | |
2e0ce1c8 AM |
824 | if (per_width == 8) |
825 | this_inf->u.cie.per_encoding_aligned8 = 1; | |
2c42be65 | 826 | } |
18e04883 | 827 | this_inf->u.cie.personality_offset = buf - start; |
65765700 | 828 | ENSURE_NO_RELOCS (buf); |
f137a54e | 829 | /* Ensure we have a reloc here. */ |
184d07da RS |
830 | REQUIRE (GET_RELOC (buf)); |
831 | cie->personality.reloc_index | |
832 | = cookie->rel - cookie->rels; | |
833 | /* Cope with MIPS-style composite relocations. */ | |
834 | do | |
835 | cookie->rel++; | |
836 | while (GET_RELOC (buf) != NULL); | |
2c42be65 | 837 | REQUIRE (skip_bytes (&buf, end, per_width)); |
65765700 JJ |
838 | } |
839 | break; | |
840 | default: | |
841 | /* Unrecognized augmentation. Better bail out. */ | |
842 | goto free_no_table; | |
843 | } | |
844 | } | |
d7153c4a AM |
845 | this_inf->u.cie.aug_data_len |
846 | = buf - start - 1 - this_inf->u.cie.aug_str_len; | |
65765700 JJ |
847 | |
848 | /* For shared libraries, try to get rid of as many RELATIVE relocs | |
0bb2d96a | 849 | as possible. */ |
0e1862bb | 850 | if (bfd_link_pic (info) |
ec3391e7 AO |
851 | && (get_elf_backend_data (abfd) |
852 | ->elf_backend_can_make_relative_eh_frame | |
353057a5 RS |
853 | (abfd, info, sec))) |
854 | { | |
18e04883 | 855 | if ((cie->fde_encoding & 0x70) == DW_EH_PE_absptr) |
6b2cc140 | 856 | this_inf->make_relative = 1; |
353057a5 RS |
857 | /* If the CIE doesn't already have an 'R' entry, it's fairly |
858 | easy to add one, provided that there's no aligned data | |
859 | after the augmentation string. */ | |
bce613b9 | 860 | else if (cie->fde_encoding == DW_EH_PE_omit |
18e04883 | 861 | && (cie->per_encoding & 0x70) != DW_EH_PE_aligned) |
353057a5 | 862 | { |
bce613b9 | 863 | if (*cie->augmentation == 0) |
353057a5 | 864 | this_inf->add_augmentation_size = 1; |
6b2cc140 RS |
865 | this_inf->u.cie.add_fde_encoding = 1; |
866 | this_inf->make_relative = 1; | |
353057a5 | 867 | } |
65765700 | 868 | |
18e04883 RS |
869 | if ((cie->lsda_encoding & 0x70) == DW_EH_PE_absptr) |
870 | cie->can_make_lsda_relative = 1; | |
871 | } | |
9e2a4898 | 872 | |
65765700 JJ |
873 | /* If FDE encoding was not specified, it defaults to |
874 | DW_EH_absptr. */ | |
bce613b9 JJ |
875 | if (cie->fde_encoding == DW_EH_PE_omit) |
876 | cie->fde_encoding = DW_EH_PE_absptr; | |
65765700 | 877 | |
dcf507a6 | 878 | initial_insn_length = end - buf; |
99d190fa AM |
879 | cie->initial_insn_length = initial_insn_length; |
880 | memcpy (cie->initial_instructions, buf, | |
881 | initial_insn_length <= sizeof (cie->initial_instructions) | |
882 | ? initial_insn_length : sizeof (cie->initial_instructions)); | |
dcf507a6 | 883 | insns = buf; |
65765700 JJ |
884 | buf += initial_insn_length; |
885 | ENSURE_NO_RELOCS (buf); | |
ca92cecb | 886 | |
0e1862bb | 887 | if (!bfd_link_relocatable (info)) |
5b69e357 AM |
888 | { |
889 | /* Keep info for merging cies. */ | |
890 | this_inf->u.cie.u.full_cie = cie; | |
891 | this_inf->u.cie.per_encoding_relative | |
892 | = (cie->per_encoding & 0x70) == DW_EH_PE_pcrel; | |
893 | } | |
65765700 JJ |
894 | } |
895 | else | |
896 | { | |
bce613b9 JJ |
897 | /* Find the corresponding CIE. */ |
898 | unsigned int cie_offset = this_inf->offset + 4 - hdr_id; | |
184d07da RS |
899 | for (cie = local_cies; cie < local_cies + cie_count; cie++) |
900 | if (cie_offset == cie->cie_inf->offset) | |
bce613b9 JJ |
901 | break; |
902 | ||
903 | /* Ensure this FDE references one of the CIEs in this input | |
904 | section. */ | |
184d07da RS |
905 | REQUIRE (cie != local_cies + cie_count); |
906 | this_inf->u.fde.cie_inf = cie->cie_inf; | |
907 | this_inf->make_relative = cie->cie_inf->make_relative; | |
6b2cc140 | 908 | this_inf->add_augmentation_size |
184d07da | 909 | = cie->cie_inf->add_augmentation_size; |
65765700 JJ |
910 | |
911 | ENSURE_NO_RELOCS (buf); | |
e41b3a13 | 912 | if ((sec->flags & SEC_LINKER_CREATED) == 0 || cookie->rels != NULL) |
2a7b2e88 | 913 | { |
e41b3a13 JJ |
914 | asection *rsec; |
915 | ||
916 | REQUIRE (GET_RELOC (buf)); | |
917 | ||
918 | /* Chain together the FDEs for each section. */ | |
1cce69b9 AM |
919 | rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, |
920 | cookie, NULL); | |
e41b3a13 JJ |
921 | /* RSEC will be NULL if FDE was cleared out as it was belonging to |
922 | a discarded SHT_GROUP. */ | |
923 | if (rsec) | |
924 | { | |
925 | REQUIRE (rsec->owner == abfd); | |
926 | this_inf->u.fde.next_for_section = elf_fde_list (rsec); | |
927 | elf_fde_list (rsec) = this_inf; | |
928 | } | |
2a7b2e88 | 929 | } |
9d0a14d3 | 930 | |
2c42be65 RS |
931 | /* Skip the initial location and address range. */ |
932 | start = buf; | |
bce613b9 | 933 | length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); |
2c42be65 RS |
934 | REQUIRE (skip_bytes (&buf, end, 2 * length)); |
935 | ||
c2aaac08 AM |
936 | SKIP_RELOCS (buf - length); |
937 | if (!GET_RELOC (buf - length) | |
938 | && read_value (abfd, buf - length, length, FALSE) == 0) | |
939 | { | |
940 | (*info->callbacks->minfo) | |
695344c0 | 941 | /* xgettext:c-format */ |
c2aaac08 AM |
942 | (_("discarding zero address range FDE in %B(%A).\n"), |
943 | abfd, sec); | |
944 | this_inf->u.fde.cie_inf = NULL; | |
945 | } | |
946 | ||
2c42be65 | 947 | /* Skip the augmentation size, if present. */ |
bce613b9 | 948 | if (cie->augmentation[0] == 'z') |
dcf507a6 RS |
949 | REQUIRE (read_uleb128 (&buf, end, &length)); |
950 | else | |
951 | length = 0; | |
2c42be65 RS |
952 | |
953 | /* Of the supported augmentation characters above, only 'L' | |
954 | adds augmentation data to the FDE. This code would need to | |
955 | be adjusted if any future augmentations do the same thing. */ | |
bce613b9 | 956 | if (cie->lsda_encoding != DW_EH_PE_omit) |
dcf507a6 | 957 | { |
9f4b847e RS |
958 | SKIP_RELOCS (buf); |
959 | if (cie->can_make_lsda_relative && GET_RELOC (buf)) | |
960 | cie->cie_inf->u.cie.make_lsda_relative = 1; | |
dcf507a6 RS |
961 | this_inf->lsda_offset = buf - start; |
962 | /* If there's no 'z' augmentation, we don't know where the | |
963 | CFA insns begin. Assume no padding. */ | |
bce613b9 | 964 | if (cie->augmentation[0] != 'z') |
dcf507a6 RS |
965 | length = end - buf; |
966 | } | |
967 | ||
968 | /* Skip over the augmentation data. */ | |
969 | REQUIRE (skip_bytes (&buf, end, length)); | |
970 | insns = buf; | |
9e2a4898 | 971 | |
bce613b9 | 972 | buf = last_fde + 4 + hdr_length; |
2a7b2e88 | 973 | |
273f4430 JK |
974 | /* For NULL RSEC (cleared FDE belonging to a discarded section) |
975 | the relocations are commonly cleared. We do not sanity check if | |
976 | all these relocations are cleared as (1) relocations to | |
977 | .gcc_except_table will remain uncleared (they will get dropped | |
978 | with the drop of this unused FDE) and (2) BFD already safely drops | |
979 | relocations of any type to .eh_frame by | |
980 | elf_section_ignore_discarded_relocs. | |
981 | TODO: The .gcc_except_table entries should be also filtered as | |
982 | .eh_frame entries; or GCC could rather use COMDAT for them. */ | |
983 | SKIP_RELOCS (buf); | |
65765700 JJ |
984 | } |
985 | ||
dcf507a6 RS |
986 | /* Try to interpret the CFA instructions and find the first |
987 | padding nop. Shrink this_inf's size so that it doesn't | |
ac685e6a | 988 | include the padding. */ |
bce613b9 | 989 | length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); |
ac685e6a JJ |
990 | set_loc_count = 0; |
991 | insns_end = skip_non_nops (insns, end, length, &set_loc_count); | |
992 | /* If we don't understand the CFA instructions, we can't know | |
993 | what needs to be adjusted there. */ | |
994 | if (insns_end == NULL | |
995 | /* For the time being we don't support DW_CFA_set_loc in | |
996 | CIE instructions. */ | |
997 | || (set_loc_count && this_inf->cie)) | |
998 | goto free_no_table; | |
999 | this_inf->size -= end - insns_end; | |
bce613b9 JJ |
1000 | if (insns_end != end && this_inf->cie) |
1001 | { | |
1002 | cie->initial_insn_length -= end - insns_end; | |
1003 | cie->length -= end - insns_end; | |
1004 | } | |
ac685e6a | 1005 | if (set_loc_count |
18e04883 | 1006 | && ((cie->fde_encoding & 0x70) == DW_EH_PE_pcrel |
6b2cc140 | 1007 | || this_inf->make_relative)) |
ac685e6a JJ |
1008 | { |
1009 | unsigned int cnt; | |
1010 | bfd_byte *p; | |
1011 | ||
a50b1753 | 1012 | this_inf->set_loc = (unsigned int *) |
07d6d2b8 | 1013 | bfd_malloc ((set_loc_count + 1) * sizeof (unsigned int)); |
ac685e6a JJ |
1014 | REQUIRE (this_inf->set_loc); |
1015 | this_inf->set_loc[0] = set_loc_count; | |
1016 | p = insns; | |
1017 | cnt = 0; | |
1018 | while (p < end) | |
1019 | { | |
1020 | if (*p == DW_CFA_set_loc) | |
1021 | this_inf->set_loc[++cnt] = p + 1 - start; | |
1022 | REQUIRE (skip_cfa_op (&p, end, length)); | |
1023 | } | |
1024 | } | |
dcf507a6 | 1025 | |
ca92cecb | 1026 | this_inf->removed = 1; |
bce613b9 JJ |
1027 | this_inf->fde_encoding = cie->fde_encoding; |
1028 | this_inf->lsda_encoding = cie->lsda_encoding; | |
65765700 JJ |
1029 | sec_info->count++; |
1030 | } | |
ca92cecb | 1031 | BFD_ASSERT (sec_info->count == num_entries); |
184d07da | 1032 | BFD_ASSERT (cie_count == num_cies); |
65765700 JJ |
1033 | |
1034 | elf_section_data (sec)->sec_info = sec_info; | |
dbaa2011 | 1035 | sec->sec_info_type = SEC_INFO_TYPE_EH_FRAME; |
0e1862bb | 1036 | if (!bfd_link_relocatable (info)) |
184d07da | 1037 | { |
da44f4e5 | 1038 | /* Keep info for merging cies. */ |
184d07da RS |
1039 | sec_info->cies = local_cies; |
1040 | local_cies = NULL; | |
1041 | } | |
ca92cecb | 1042 | goto success; |
65765700 | 1043 | |
ca92cecb RS |
1044 | free_no_table: |
1045 | (*info->callbacks->einfo) | |
695344c0 | 1046 | /* xgettext:c-format */ |
ca92cecb RS |
1047 | (_("%P: error in %B(%A); no .eh_frame_hdr table will be created.\n"), |
1048 | abfd, sec); | |
2f0c68f2 | 1049 | hdr_info->u.dwarf.table = FALSE; |
ca92cecb RS |
1050 | if (sec_info) |
1051 | free (sec_info); | |
1052 | success: | |
1053 | if (ehbuf) | |
1054 | free (ehbuf); | |
ca92cecb RS |
1055 | if (local_cies) |
1056 | free (local_cies); | |
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 | ||
1110 | bfd_set_section_size (sec->owner, sec, sec->size + 8); | |
1111 | } | |
1112 | ||
1113 | /* Finish a pass over all .eh_frame_entry sections. */ | |
1114 | ||
1115 | bfd_boolean | |
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) | |
1125 | return FALSE; | |
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); | |
1140 | return TRUE; | |
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 | ||
1147 | static bfd_boolean | |
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)) | |
1158 | return FALSE; | |
1159 | ||
1160 | return TRUE; | |
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 | ||
1167 | bfd_boolean | |
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)) | |
1177 | return FALSE; | |
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 RS |
1185 | if (!mark_entry (info, eh_frame, cie, gc_mark_hook, cookie)) |
1186 | return FALSE; | |
1187 | } | |
1188 | } | |
1189 | return TRUE; | |
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 | { | |
18e04883 RS |
1230 | bfd_boolean per_binds_local; |
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; | |
18e04883 RS |
1279 | per_binds_local = TRUE; |
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 | ||
1415 | bfd_boolean | |
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) | |
1424 | return TRUE; | |
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) | |
1429 | return TRUE; | |
1430 | ||
1431 | delta = offset_adjust (h->root.u.def.value, sym_sec); | |
1432 | h->root.u.def.value += delta; | |
1433 | ||
1434 | return TRUE; | |
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 | { | |
1444 | unsigned int shndx; | |
1445 | Elf_Internal_Sym *sym; | |
1446 | Elf_Internal_Sym *end_sym; | |
1447 | int adjusted = 0; | |
1448 | ||
1449 | shndx = elf_section_data (sec)->this_idx; | |
1450 | end_sym = cookie->locsyms + cookie->locsymcount; | |
1451 | for (sym = cookie->locsyms + 1; sym < end_sym; ++sym) | |
1452 | if (sym->st_info <= ELF_ST_INFO (STB_LOCAL, STT_OBJECT) | |
1453 | && sym->st_shndx == shndx) | |
1454 | { | |
1455 | bfd_signed_vma delta = offset_adjust (sym->st_value, sec); | |
1456 | ||
1457 | if (delta != 0) | |
1458 | { | |
1459 | adjusted = 1; | |
1460 | sym->st_value += delta; | |
1461 | } | |
1462 | } | |
1463 | return adjusted; | |
1464 | } | |
1465 | ||
ca92cecb RS |
1466 | /* This function is called for each input file before the .eh_frame |
1467 | section is relocated. It discards duplicate CIEs and FDEs for discarded | |
1468 | functions. The function returns TRUE iff any entries have been | |
1469 | deleted. */ | |
1470 | ||
1471 | bfd_boolean | |
1472 | _bfd_elf_discard_section_eh_frame | |
1473 | (bfd *abfd, struct bfd_link_info *info, asection *sec, | |
1474 | bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *), | |
1475 | struct elf_reloc_cookie *cookie) | |
1476 | { | |
184d07da | 1477 | struct eh_cie_fde *ent; |
ca92cecb RS |
1478 | struct eh_frame_sec_info *sec_info; |
1479 | struct eh_frame_hdr_info *hdr_info; | |
2e0ce1c8 | 1480 | unsigned int ptr_size, offset, eh_alignment; |
d7153c4a | 1481 | int changed; |
ca92cecb | 1482 | |
dbaa2011 | 1483 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
4d16d575 AM |
1484 | return FALSE; |
1485 | ||
ca92cecb RS |
1486 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
1487 | if (sec_info == NULL) | |
1488 | return FALSE; | |
1489 | ||
e41b3a13 JJ |
1490 | ptr_size = (get_elf_backend_data (sec->owner) |
1491 | ->elf_backend_eh_frame_address_size (sec->owner, sec)); | |
1492 | ||
ca92cecb | 1493 | hdr_info = &elf_hash_table (info)->eh_info; |
fda3ecf2 | 1494 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
f60e73e9 AM |
1495 | if (ent->size == 4) |
1496 | /* There should only be one zero terminator, on the last input | |
1497 | file supplying .eh_frame (crtend.o). Remove any others. */ | |
1498 | ent->removed = sec->map_head.s != NULL; | |
c2aaac08 | 1499 | else if (!ent->cie && ent->u.fde.cie_inf != NULL) |
fda3ecf2 | 1500 | { |
e41b3a13 JJ |
1501 | bfd_boolean keep; |
1502 | if ((sec->flags & SEC_LINKER_CREATED) != 0 && cookie->rels == NULL) | |
1503 | { | |
1504 | unsigned int width | |
1505 | = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1506 | bfd_vma value | |
1507 | = read_value (abfd, sec->contents + ent->offset + 8 + width, | |
1508 | width, get_DW_EH_PE_signed (ent->fde_encoding)); | |
1509 | keep = value != 0; | |
1510 | } | |
1511 | else | |
1512 | { | |
1513 | cookie->rel = cookie->rels + ent->reloc_index; | |
1514 | /* FIXME: octets_per_byte. */ | |
1515 | BFD_ASSERT (cookie->rel < cookie->relend | |
1516 | && cookie->rel->r_offset == ent->offset + 8); | |
1517 | keep = !(*reloc_symbol_deleted_p) (ent->offset + 8, cookie); | |
1518 | } | |
1519 | if (keep) | |
bce613b9 | 1520 | { |
0e1862bb | 1521 | if (bfd_link_pic (info) |
18e04883 | 1522 | && (((ent->fde_encoding & 0x70) == DW_EH_PE_absptr |
6b2cc140 | 1523 | && ent->make_relative == 0) |
18e04883 | 1524 | || (ent->fde_encoding & 0x70) == DW_EH_PE_aligned)) |
ca92cecb | 1525 | { |
83da6e74 NC |
1526 | static int num_warnings_issued = 0; |
1527 | ||
ca92cecb RS |
1528 | /* If a shared library uses absolute pointers |
1529 | which we cannot turn into PC relative, | |
1530 | don't create the binary search table, | |
1531 | since it is affected by runtime relocations. */ | |
2f0c68f2 | 1532 | hdr_info->u.dwarf.table = FALSE; |
83da6e74 NC |
1533 | if (num_warnings_issued < 10) |
1534 | { | |
1535 | (*info->callbacks->einfo) | |
695344c0 | 1536 | /* xgettext:c-format */ |
83da6e74 NC |
1537 | (_("%P: FDE encoding in %B(%A) prevents .eh_frame_hdr" |
1538 | " table being created.\n"), abfd, sec); | |
1539 | num_warnings_issued ++; | |
1540 | } | |
1541 | else if (num_warnings_issued == 10) | |
1542 | { | |
1543 | (*info->callbacks->einfo) | |
1544 | (_("%P: Further warnings about FDE encoding preventing .eh_frame_hdr generation dropped.\n")); | |
1545 | num_warnings_issued ++; | |
1546 | } | |
ca92cecb RS |
1547 | } |
1548 | ent->removed = 0; | |
2f0c68f2 | 1549 | hdr_info->u.dwarf.fde_count++; |
18e04883 RS |
1550 | ent->u.fde.cie_inf = find_merged_cie (abfd, info, sec, hdr_info, |
1551 | cookie, ent->u.fde.cie_inf); | |
bce613b9 | 1552 | } |
ca92cecb RS |
1553 | } |
1554 | ||
184d07da RS |
1555 | if (sec_info->cies) |
1556 | { | |
1557 | free (sec_info->cies); | |
1558 | sec_info->cies = NULL; | |
1559 | } | |
1560 | ||
2e0ce1c8 AM |
1561 | /* It may be that some .eh_frame input section has greater alignment |
1562 | than other .eh_frame sections. In that case we run the risk of | |
1563 | padding with zeros before that section, which would be seen as a | |
1564 | zero terminator. Alignment padding must be added *inside* the | |
1565 | last FDE instead. For other FDEs we align according to their | |
1566 | encoding, in order to align FDE address range entries naturally. */ | |
ca92cecb | 1567 | offset = 0; |
d7153c4a | 1568 | changed = 0; |
ca92cecb RS |
1569 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
1570 | if (!ent->removed) | |
1571 | { | |
2e0ce1c8 AM |
1572 | eh_alignment = 4; |
1573 | if (ent->size == 4) | |
1574 | ; | |
1575 | else if (ent->cie) | |
1576 | { | |
1577 | if (ent->u.cie.per_encoding_aligned8) | |
1578 | eh_alignment = 8; | |
1579 | } | |
1580 | else | |
1581 | { | |
1582 | eh_alignment = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1583 | if (eh_alignment < 4) | |
1584 | eh_alignment = 4; | |
1585 | } | |
1586 | offset = (offset + eh_alignment - 1) & -eh_alignment; | |
353057a5 | 1587 | ent->new_offset = offset; |
d7153c4a AM |
1588 | if (ent->new_offset != ent->offset) |
1589 | changed = 1; | |
2e0ce1c8 | 1590 | offset += size_of_output_cie_fde (ent); |
fda3ecf2 | 1591 | } |
65765700 | 1592 | |
2e0ce1c8 | 1593 | eh_alignment = 4; |
2e0ce1c8 | 1594 | offset = (offset + eh_alignment - 1) & -eh_alignment; |
eea6121a | 1595 | sec->rawsize = sec->size; |
353057a5 | 1596 | sec->size = offset; |
d7153c4a AM |
1597 | if (sec->size != sec->rawsize) |
1598 | changed = 1; | |
1599 | ||
1600 | if (changed && adjust_eh_frame_local_symbols (sec, cookie)) | |
1601 | { | |
1602 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1603 | symtab_hdr->contents = (unsigned char *) cookie->locsyms; | |
1604 | } | |
1605 | return changed; | |
65765700 JJ |
1606 | } |
1607 | ||
1608 | /* This function is called for .eh_frame_hdr section after | |
1609 | _bfd_elf_discard_section_eh_frame has been called on all .eh_frame | |
1610 | input sections. It finalizes the size of .eh_frame_hdr section. */ | |
1611 | ||
b34976b6 | 1612 | bfd_boolean |
c39a58e6 | 1613 | _bfd_elf_discard_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
65765700 | 1614 | { |
126495ed | 1615 | struct elf_link_hash_table *htab; |
65765700 | 1616 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 1617 | asection *sec; |
65765700 | 1618 | |
126495ed AM |
1619 | htab = elf_hash_table (info); |
1620 | hdr_info = &htab->eh_info; | |
bce613b9 | 1621 | |
2f0c68f2 | 1622 | if (!hdr_info->frame_hdr_is_compact && hdr_info->u.dwarf.cies != NULL) |
184d07da | 1623 | { |
2f0c68f2 CM |
1624 | htab_delete (hdr_info->u.dwarf.cies); |
1625 | hdr_info->u.dwarf.cies = NULL; | |
184d07da RS |
1626 | } |
1627 | ||
126495ed AM |
1628 | sec = hdr_info->hdr_sec; |
1629 | if (sec == NULL) | |
b34976b6 | 1630 | return FALSE; |
126495ed | 1631 | |
2f0c68f2 CM |
1632 | if (info->eh_frame_hdr_type == COMPACT_EH_HDR) |
1633 | { | |
1634 | /* For compact frames we only add the header. The actual table comes | |
07d6d2b8 | 1635 | from the .eh_frame_entry sections. */ |
2f0c68f2 CM |
1636 | sec->size = 8; |
1637 | } | |
1638 | else | |
1639 | { | |
1640 | sec->size = EH_FRAME_HDR_SIZE; | |
1641 | if (hdr_info->u.dwarf.table) | |
1642 | sec->size += 4 + hdr_info->u.dwarf.fde_count * 8; | |
1643 | } | |
65765700 | 1644 | |
12bd6957 | 1645 | elf_eh_frame_hdr (abfd) = sec; |
b34976b6 | 1646 | return TRUE; |
65765700 JJ |
1647 | } |
1648 | ||
9a2a56cc AM |
1649 | /* Return true if there is at least one non-empty .eh_frame section in |
1650 | input files. Can only be called after ld has mapped input to | |
1651 | output sections, and before sections are stripped. */ | |
2f0c68f2 | 1652 | |
9a2a56cc AM |
1653 | bfd_boolean |
1654 | _bfd_elf_eh_frame_present (struct bfd_link_info *info) | |
1655 | { | |
1656 | asection *eh = bfd_get_section_by_name (info->output_bfd, ".eh_frame"); | |
1657 | ||
1658 | if (eh == NULL) | |
1659 | return FALSE; | |
1660 | ||
1661 | /* Count only sections which have at least a single CIE or FDE. | |
1662 | There cannot be any CIE or FDE <= 8 bytes. */ | |
1663 | for (eh = eh->map_head.s; eh != NULL; eh = eh->map_head.s) | |
1664 | if (eh->size > 8) | |
1665 | return TRUE; | |
1666 | ||
1667 | return FALSE; | |
1668 | } | |
1669 | ||
2f0c68f2 CM |
1670 | /* Return true if there is at least one .eh_frame_entry section in |
1671 | input files. */ | |
1672 | ||
1673 | bfd_boolean | |
1674 | _bfd_elf_eh_frame_entry_present (struct bfd_link_info *info) | |
1675 | { | |
1676 | asection *o; | |
1677 | bfd *abfd; | |
1678 | ||
1679 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next) | |
1680 | { | |
1681 | for (o = abfd->sections; o; o = o->next) | |
1682 | { | |
1683 | const char *name = bfd_get_section_name (abfd, o); | |
1684 | ||
1685 | if (strcmp (name, ".eh_frame_entry") | |
1686 | && !bfd_is_abs_section (o->output_section)) | |
1687 | return TRUE; | |
1688 | } | |
1689 | } | |
1690 | return FALSE; | |
1691 | } | |
1692 | ||
68f69152 JJ |
1693 | /* This function is called from size_dynamic_sections. |
1694 | It needs to decide whether .eh_frame_hdr should be output or not, | |
8423293d AM |
1695 | because when the dynamic symbol table has been sized it is too late |
1696 | to strip sections. */ | |
68f69152 | 1697 | |
b34976b6 | 1698 | bfd_boolean |
c39a58e6 | 1699 | _bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info) |
68f69152 | 1700 | { |
126495ed | 1701 | struct elf_link_hash_table *htab; |
68f69152 | 1702 | struct eh_frame_hdr_info *hdr_info; |
2f0c68f2 CM |
1703 | struct bfd_link_hash_entry *bh = NULL; |
1704 | struct elf_link_hash_entry *h; | |
68f69152 | 1705 | |
126495ed AM |
1706 | htab = elf_hash_table (info); |
1707 | hdr_info = &htab->eh_info; | |
1708 | if (hdr_info->hdr_sec == NULL) | |
b34976b6 | 1709 | return TRUE; |
68f69152 | 1710 | |
9a2a56cc | 1711 | if (bfd_is_abs_section (hdr_info->hdr_sec->output_section) |
2f0c68f2 CM |
1712 | || info->eh_frame_hdr_type == 0 |
1713 | || (info->eh_frame_hdr_type == DWARF2_EH_HDR | |
1714 | && !_bfd_elf_eh_frame_present (info)) | |
1715 | || (info->eh_frame_hdr_type == COMPACT_EH_HDR | |
1716 | && !_bfd_elf_eh_frame_entry_present (info))) | |
68f69152 | 1717 | { |
8423293d | 1718 | hdr_info->hdr_sec->flags |= SEC_EXCLUDE; |
126495ed | 1719 | hdr_info->hdr_sec = NULL; |
b34976b6 | 1720 | return TRUE; |
68f69152 | 1721 | } |
126495ed | 1722 | |
2f0c68f2 CM |
1723 | /* Add a hidden symbol so that systems without access to PHDRs can |
1724 | find the table. */ | |
1725 | if (! (_bfd_generic_link_add_one_symbol | |
1726 | (info, info->output_bfd, "__GNU_EH_FRAME_HDR", BSF_LOCAL, | |
1727 | hdr_info->hdr_sec, 0, NULL, FALSE, FALSE, &bh))) | |
1728 | return FALSE; | |
1729 | ||
1730 | h = (struct elf_link_hash_entry *) bh; | |
1731 | h->def_regular = 1; | |
1732 | h->other = STV_HIDDEN; | |
1733 | get_elf_backend_data | |
1734 | (info->output_bfd)->elf_backend_hide_symbol (info, h, TRUE); | |
1735 | ||
1736 | if (!hdr_info->frame_hdr_is_compact) | |
1737 | hdr_info->u.dwarf.table = TRUE; | |
b34976b6 | 1738 | return TRUE; |
68f69152 JJ |
1739 | } |
1740 | ||
65765700 JJ |
1741 | /* Adjust an address in the .eh_frame section. Given OFFSET within |
1742 | SEC, this returns the new offset in the adjusted .eh_frame section, | |
1743 | or -1 if the address refers to a CIE/FDE which has been removed | |
1744 | or to offset with dynamic relocation which is no longer needed. */ | |
1745 | ||
1746 | bfd_vma | |
c39a58e6 | 1747 | _bfd_elf_eh_frame_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, |
3d540e93 | 1748 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
c39a58e6 AM |
1749 | asection *sec, |
1750 | bfd_vma offset) | |
65765700 JJ |
1751 | { |
1752 | struct eh_frame_sec_info *sec_info; | |
1753 | unsigned int lo, hi, mid; | |
1754 | ||
dbaa2011 | 1755 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
65765700 | 1756 | return offset; |
a50b1753 | 1757 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
65765700 | 1758 | |
eea6121a AM |
1759 | if (offset >= sec->rawsize) |
1760 | return offset - sec->rawsize + sec->size; | |
65765700 JJ |
1761 | |
1762 | lo = 0; | |
1763 | hi = sec_info->count; | |
1764 | mid = 0; | |
1765 | while (lo < hi) | |
1766 | { | |
1767 | mid = (lo + hi) / 2; | |
1768 | if (offset < sec_info->entry[mid].offset) | |
1769 | hi = mid; | |
1770 | else if (offset | |
1771 | >= sec_info->entry[mid].offset + sec_info->entry[mid].size) | |
1772 | lo = mid + 1; | |
1773 | else | |
1774 | break; | |
1775 | } | |
1776 | ||
1777 | BFD_ASSERT (lo < hi); | |
1778 | ||
1779 | /* FDE or CIE was removed. */ | |
1780 | if (sec_info->entry[mid].removed) | |
1781 | return (bfd_vma) -1; | |
1782 | ||
18e04883 RS |
1783 | /* If converting personality pointers to DW_EH_PE_pcrel, there will be |
1784 | no need for run-time relocation against the personality field. */ | |
1785 | if (sec_info->entry[mid].cie | |
1786 | && sec_info->entry[mid].u.cie.make_per_encoding_relative | |
1787 | && offset == (sec_info->entry[mid].offset + 8 | |
1788 | + sec_info->entry[mid].u.cie.personality_offset)) | |
1789 | return (bfd_vma) -2; | |
1790 | ||
65765700 JJ |
1791 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1792 | relocation against FDE's initial_location field. */ | |
fda3ecf2 | 1793 | if (!sec_info->entry[mid].cie |
6b2cc140 | 1794 | && sec_info->entry[mid].make_relative |
353057a5 RS |
1795 | && offset == sec_info->entry[mid].offset + 8) |
1796 | return (bfd_vma) -2; | |
65765700 | 1797 | |
9e2a4898 JJ |
1798 | /* If converting LSDA pointers to DW_EH_PE_pcrel, there will be no need |
1799 | for run-time relocation against LSDA field. */ | |
fda3ecf2 | 1800 | if (!sec_info->entry[mid].cie |
9f4b847e RS |
1801 | && sec_info->entry[mid].u.fde.cie_inf->u.cie.make_lsda_relative |
1802 | && offset == (sec_info->entry[mid].offset + 8 | |
1803 | + sec_info->entry[mid].lsda_offset)) | |
1804 | return (bfd_vma) -2; | |
9e2a4898 | 1805 | |
ac685e6a JJ |
1806 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1807 | relocation against DW_CFA_set_loc's arguments. */ | |
1808 | if (sec_info->entry[mid].set_loc | |
6b2cc140 | 1809 | && sec_info->entry[mid].make_relative |
ac685e6a JJ |
1810 | && (offset >= sec_info->entry[mid].offset + 8 |
1811 | + sec_info->entry[mid].set_loc[1])) | |
1812 | { | |
1813 | unsigned int cnt; | |
1814 | ||
1815 | for (cnt = 1; cnt <= sec_info->entry[mid].set_loc[0]; cnt++) | |
1816 | if (offset == sec_info->entry[mid].offset + 8 | |
1817 | + sec_info->entry[mid].set_loc[cnt]) | |
1818 | return (bfd_vma) -2; | |
1819 | } | |
1820 | ||
353057a5 | 1821 | /* Any new augmentation bytes go before the first relocation. */ |
c68836a9 | 1822 | return (offset + sec_info->entry[mid].new_offset |
353057a5 RS |
1823 | - sec_info->entry[mid].offset |
1824 | + extra_augmentation_string_bytes (sec_info->entry + mid) | |
1825 | + extra_augmentation_data_bytes (sec_info->entry + mid)); | |
65765700 JJ |
1826 | } |
1827 | ||
2f0c68f2 CM |
1828 | /* Write out .eh_frame_entry section. Add CANTUNWIND terminator if needed. |
1829 | Also check that the contents look sane. */ | |
1830 | ||
1831 | bfd_boolean | |
1832 | _bfd_elf_write_section_eh_frame_entry (bfd *abfd, struct bfd_link_info *info, | |
1833 | asection *sec, bfd_byte *contents) | |
1834 | { | |
1835 | const struct elf_backend_data *bed; | |
1836 | bfd_byte cantunwind[8]; | |
1837 | bfd_vma addr; | |
1838 | bfd_vma last_addr; | |
1839 | bfd_vma offset; | |
1840 | asection *text_sec = (asection *) elf_section_data (sec)->sec_info; | |
1841 | ||
1842 | if (!sec->rawsize) | |
1843 | sec->rawsize = sec->size; | |
1844 | ||
1845 | BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_EH_FRAME_ENTRY); | |
1846 | ||
1847 | /* Check to make sure that the text section corresponding to this eh_frame_entry | |
1848 | section has not been excluded. In particular, mips16 stub entries will be | |
1849 | excluded outside of the normal process. */ | |
1850 | if (sec->flags & SEC_EXCLUDE | |
1851 | || text_sec->flags & SEC_EXCLUDE) | |
1852 | return TRUE; | |
1853 | ||
1854 | if (!bfd_set_section_contents (abfd, sec->output_section, contents, | |
1855 | sec->output_offset, sec->rawsize)) | |
1856 | return FALSE; | |
1857 | ||
1858 | last_addr = bfd_get_signed_32 (abfd, contents); | |
1859 | /* Check that all the entries are in order. */ | |
1860 | for (offset = 8; offset < sec->rawsize; offset += 8) | |
1861 | { | |
1862 | addr = bfd_get_signed_32 (abfd, contents + offset) + offset; | |
1863 | if (addr <= last_addr) | |
1864 | { | |
695344c0 | 1865 | /* xgettext:c-format */ |
dae82561 | 1866 | _bfd_error_handler (_("%B: %A not in order"), sec->owner, sec); |
2f0c68f2 CM |
1867 | return FALSE; |
1868 | } | |
1869 | ||
1870 | last_addr = addr; | |
1871 | } | |
1872 | ||
1873 | addr = text_sec->output_section->vma + text_sec->output_offset | |
1874 | + text_sec->size; | |
1875 | addr &= ~1; | |
1876 | addr -= (sec->output_section->vma + sec->output_offset + sec->rawsize); | |
1877 | if (addr & 1) | |
1878 | { | |
695344c0 | 1879 | /* xgettext:c-format */ |
dae82561 AM |
1880 | _bfd_error_handler (_("%B: %A invalid input section size"), |
1881 | sec->owner, sec); | |
2f0c68f2 CM |
1882 | bfd_set_error (bfd_error_bad_value); |
1883 | return FALSE; | |
1884 | } | |
1885 | if (last_addr >= addr + sec->rawsize) | |
1886 | { | |
695344c0 | 1887 | /* xgettext:c-format */ |
dae82561 AM |
1888 | _bfd_error_handler (_("%B: %A points past end of text section"), |
1889 | sec->owner, sec); | |
2f0c68f2 CM |
1890 | bfd_set_error (bfd_error_bad_value); |
1891 | return FALSE; | |
1892 | } | |
1893 | ||
1894 | if (sec->size == sec->rawsize) | |
1895 | return TRUE; | |
1896 | ||
1897 | bed = get_elf_backend_data (abfd); | |
1898 | BFD_ASSERT (sec->size == sec->rawsize + 8); | |
1899 | BFD_ASSERT ((addr & 1) == 0); | |
1900 | BFD_ASSERT (bed->cant_unwind_opcode); | |
1901 | ||
1902 | bfd_put_32 (abfd, addr, cantunwind); | |
1903 | bfd_put_32 (abfd, (*bed->cant_unwind_opcode) (info), cantunwind + 4); | |
1904 | return bfd_set_section_contents (abfd, sec->output_section, cantunwind, | |
1905 | sec->output_offset + sec->rawsize, 8); | |
1906 | } | |
1907 | ||
65765700 JJ |
1908 | /* Write out .eh_frame section. This is called with the relocated |
1909 | contents. */ | |
1910 | ||
b34976b6 | 1911 | bfd_boolean |
c39a58e6 AM |
1912 | _bfd_elf_write_section_eh_frame (bfd *abfd, |
1913 | struct bfd_link_info *info, | |
1914 | asection *sec, | |
1915 | bfd_byte *contents) | |
65765700 JJ |
1916 | { |
1917 | struct eh_frame_sec_info *sec_info; | |
126495ed | 1918 | struct elf_link_hash_table *htab; |
65765700 | 1919 | struct eh_frame_hdr_info *hdr_info; |
65765700 | 1920 | unsigned int ptr_size; |
2e0ce1c8 | 1921 | struct eh_cie_fde *ent, *last_ent; |
65765700 | 1922 | |
dbaa2011 | 1923 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
5dabe785 | 1924 | /* FIXME: octets_per_byte. */ |
c39a58e6 | 1925 | return bfd_set_section_contents (abfd, sec->output_section, contents, |
eea6121a | 1926 | sec->output_offset, sec->size); |
8c946ed5 RS |
1927 | |
1928 | ptr_size = (get_elf_backend_data (abfd) | |
1929 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
1930 | BFD_ASSERT (ptr_size != 0); | |
1931 | ||
a50b1753 | 1932 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
126495ed AM |
1933 | htab = elf_hash_table (info); |
1934 | hdr_info = &htab->eh_info; | |
3472e2e9 | 1935 | |
2f0c68f2 CM |
1936 | if (hdr_info->u.dwarf.table && hdr_info->u.dwarf.array == NULL) |
1937 | { | |
1938 | hdr_info->frame_hdr_is_compact = FALSE; | |
1939 | hdr_info->u.dwarf.array = (struct eh_frame_array_ent *) | |
07d6d2b8 | 1940 | bfd_malloc (hdr_info->u.dwarf.fde_count |
2f0c68f2 CM |
1941 | * sizeof (*hdr_info->u.dwarf.array)); |
1942 | } | |
1943 | if (hdr_info->u.dwarf.array == NULL) | |
126495ed | 1944 | hdr_info = NULL; |
65765700 | 1945 | |
353057a5 RS |
1946 | /* The new offsets can be bigger or smaller than the original offsets. |
1947 | We therefore need to make two passes over the section: one backward | |
1948 | pass to move entries up and one forward pass to move entries down. | |
1949 | The two passes won't interfere with each other because entries are | |
1950 | not reordered */ | |
1951 | for (ent = sec_info->entry + sec_info->count; ent-- != sec_info->entry;) | |
1952 | if (!ent->removed && ent->new_offset > ent->offset) | |
fc802241 | 1953 | memmove (contents + ent->new_offset, contents + ent->offset, ent->size); |
353057a5 RS |
1954 | |
1955 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) | |
1956 | if (!ent->removed && ent->new_offset < ent->offset) | |
fc802241 | 1957 | memmove (contents + ent->new_offset, contents + ent->offset, ent->size); |
353057a5 | 1958 | |
2e0ce1c8 AM |
1959 | last_ent = sec_info->entry + sec_info->count; |
1960 | for (ent = sec_info->entry; ent < last_ent; ++ent) | |
65765700 | 1961 | { |
353057a5 RS |
1962 | unsigned char *buf, *end; |
1963 | unsigned int new_size; | |
1964 | ||
fda3ecf2 AM |
1965 | if (ent->removed) |
1966 | continue; | |
1967 | ||
353057a5 RS |
1968 | if (ent->size == 4) |
1969 | { | |
1970 | /* Any terminating FDE must be at the end of the section. */ | |
2e0ce1c8 | 1971 | BFD_ASSERT (ent == last_ent - 1); |
353057a5 RS |
1972 | continue; |
1973 | } | |
1974 | ||
fc802241 | 1975 | buf = contents + ent->new_offset; |
353057a5 | 1976 | end = buf + ent->size; |
2e0ce1c8 | 1977 | new_size = next_cie_fde_offset (ent, last_ent, sec) - ent->new_offset; |
353057a5 | 1978 | |
a34a056a L |
1979 | /* Update the size. It may be shrinked. */ |
1980 | bfd_put_32 (abfd, new_size - 4, buf); | |
1981 | ||
1982 | /* Filling the extra bytes with DW_CFA_nops. */ | |
353057a5 | 1983 | if (new_size != ent->size) |
a34a056a | 1984 | memset (end, 0, new_size - ent->size); |
353057a5 | 1985 | |
fda3ecf2 | 1986 | if (ent->cie) |
65765700 JJ |
1987 | { |
1988 | /* CIE */ | |
353057a5 | 1989 | if (ent->make_relative |
9f4b847e | 1990 | || ent->u.cie.make_lsda_relative |
6b2cc140 | 1991 | || ent->u.cie.per_encoding_relative) |
65765700 | 1992 | { |
f075ee0c | 1993 | char *aug; |
353057a5 | 1994 | unsigned int action, extra_string, extra_data; |
2c42be65 | 1995 | unsigned int per_width, per_encoding; |
65765700 | 1996 | |
9e2a4898 | 1997 | /* Need to find 'R' or 'L' augmentation's argument and modify |
65765700 | 1998 | DW_EH_PE_* value. */ |
353057a5 | 1999 | action = ((ent->make_relative ? 1 : 0) |
9f4b847e | 2000 | | (ent->u.cie.make_lsda_relative ? 2 : 0) |
6b2cc140 | 2001 | | (ent->u.cie.per_encoding_relative ? 4 : 0)); |
353057a5 RS |
2002 | extra_string = extra_augmentation_string_bytes (ent); |
2003 | extra_data = extra_augmentation_data_bytes (ent); | |
2004 | ||
65765700 JJ |
2005 | /* Skip length, id and version. */ |
2006 | buf += 9; | |
f075ee0c AM |
2007 | aug = (char *) buf; |
2008 | buf += strlen (aug) + 1; | |
2c42be65 RS |
2009 | skip_leb128 (&buf, end); |
2010 | skip_leb128 (&buf, end); | |
2011 | skip_leb128 (&buf, end); | |
65765700 JJ |
2012 | if (*aug == 'z') |
2013 | { | |
353057a5 RS |
2014 | /* The uleb128 will always be a single byte for the kind |
2015 | of augmentation strings that we're prepared to handle. */ | |
2016 | *buf++ += extra_data; | |
65765700 JJ |
2017 | aug++; |
2018 | } | |
2019 | ||
353057a5 RS |
2020 | /* Make room for the new augmentation string and data bytes. */ |
2021 | memmove (buf + extra_string + extra_data, buf, end - buf); | |
f075ee0c | 2022 | memmove (aug + extra_string, aug, buf - (bfd_byte *) aug); |
353057a5 | 2023 | buf += extra_string; |
2c42be65 | 2024 | end += extra_string + extra_data; |
353057a5 RS |
2025 | |
2026 | if (ent->add_augmentation_size) | |
2027 | { | |
2028 | *aug++ = 'z'; | |
2029 | *buf++ = extra_data - 1; | |
2030 | } | |
6b2cc140 | 2031 | if (ent->u.cie.add_fde_encoding) |
353057a5 RS |
2032 | { |
2033 | BFD_ASSERT (action & 1); | |
2034 | *aug++ = 'R'; | |
30af5962 | 2035 | *buf++ = make_pc_relative (DW_EH_PE_absptr, ptr_size); |
353057a5 RS |
2036 | action &= ~1; |
2037 | } | |
2038 | ||
9e2a4898 | 2039 | while (action) |
65765700 JJ |
2040 | switch (*aug++) |
2041 | { | |
2042 | case 'L': | |
9e2a4898 JJ |
2043 | if (action & 2) |
2044 | { | |
fda3ecf2 | 2045 | BFD_ASSERT (*buf == ent->lsda_encoding); |
30af5962 | 2046 | *buf = make_pc_relative (*buf, ptr_size); |
9e2a4898 JJ |
2047 | action &= ~2; |
2048 | } | |
65765700 JJ |
2049 | buf++; |
2050 | break; | |
2051 | case 'P': | |
18e04883 | 2052 | if (ent->u.cie.make_per_encoding_relative) |
a10917ef | 2053 | *buf = make_pc_relative (*buf, ptr_size); |
65765700 | 2054 | per_encoding = *buf++; |
3472e2e9 | 2055 | per_width = get_DW_EH_PE_width (per_encoding, ptr_size); |
65765700 | 2056 | BFD_ASSERT (per_width != 0); |
09ae86c2 | 2057 | BFD_ASSERT (((per_encoding & 0x70) == DW_EH_PE_pcrel) |
6b2cc140 | 2058 | == ent->u.cie.per_encoding_relative); |
18e04883 | 2059 | if ((per_encoding & 0x70) == DW_EH_PE_aligned) |
65765700 JJ |
2060 | buf = (contents |
2061 | + ((buf - contents + per_width - 1) | |
2062 | & ~((bfd_size_type) per_width - 1))); | |
09ae86c2 JJ |
2063 | if (action & 4) |
2064 | { | |
fda3ecf2 AM |
2065 | bfd_vma val; |
2066 | ||
2067 | val = read_value (abfd, buf, per_width, | |
2068 | get_DW_EH_PE_signed (per_encoding)); | |
18e04883 RS |
2069 | if (ent->u.cie.make_per_encoding_relative) |
2070 | val -= (sec->output_section->vma | |
2071 | + sec->output_offset | |
2072 | + (buf - contents)); | |
2073 | else | |
2074 | { | |
2075 | val += (bfd_vma) ent->offset - ent->new_offset; | |
2076 | val -= extra_string + extra_data; | |
2077 | } | |
fda3ecf2 | 2078 | write_value (abfd, buf, val, per_width); |
09ae86c2 JJ |
2079 | action &= ~4; |
2080 | } | |
65765700 JJ |
2081 | buf += per_width; |
2082 | break; | |
9e2a4898 JJ |
2083 | case 'R': |
2084 | if (action & 1) | |
2085 | { | |
fda3ecf2 | 2086 | BFD_ASSERT (*buf == ent->fde_encoding); |
30af5962 | 2087 | *buf = make_pc_relative (*buf, ptr_size); |
9e2a4898 JJ |
2088 | action &= ~1; |
2089 | } | |
2090 | buf++; | |
2091 | break; | |
63752a75 JJ |
2092 | case 'S': |
2093 | break; | |
65765700 JJ |
2094 | default: |
2095 | BFD_FAIL (); | |
2096 | } | |
65765700 JJ |
2097 | } |
2098 | } | |
353057a5 | 2099 | else |
65765700 JJ |
2100 | { |
2101 | /* FDE */ | |
fda3ecf2 | 2102 | bfd_vma value, address; |
9e2a4898 | 2103 | unsigned int width; |
ac685e6a | 2104 | bfd_byte *start; |
155eaaa0 | 2105 | struct eh_cie_fde *cie; |
65765700 | 2106 | |
b34976b6 | 2107 | /* Skip length. */ |
155eaaa0 | 2108 | cie = ent->u.fde.cie_inf; |
65765700 | 2109 | buf += 4; |
fc802241 RS |
2110 | value = ((ent->new_offset + sec->output_offset + 4) |
2111 | - (cie->new_offset + cie->u.cie.u.sec->output_offset)); | |
fda3ecf2 | 2112 | bfd_put_32 (abfd, value, buf); |
0e1862bb | 2113 | if (bfd_link_relocatable (info)) |
5b69e357 | 2114 | continue; |
65765700 | 2115 | buf += 4; |
fda3ecf2 AM |
2116 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); |
2117 | value = read_value (abfd, buf, width, | |
2118 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
2119 | address = value; | |
9e2a4898 | 2120 | if (value) |
65765700 | 2121 | { |
18e04883 | 2122 | switch (ent->fde_encoding & 0x70) |
9e2a4898 | 2123 | { |
9e2a4898 JJ |
2124 | case DW_EH_PE_textrel: |
2125 | BFD_ASSERT (hdr_info == NULL); | |
2126 | break; | |
2127 | case DW_EH_PE_datarel: | |
2128 | { | |
cd9e734e AM |
2129 | switch (abfd->arch_info->arch) |
2130 | { | |
2131 | case bfd_arch_ia64: | |
2132 | BFD_ASSERT (elf_gp (abfd) != 0); | |
2133 | address += elf_gp (abfd); | |
2134 | break; | |
2135 | default: | |
2136 | (*info->callbacks->einfo) | |
2137 | (_("%P: DW_EH_PE_datarel unspecified" | |
2138 | " for this architecture.\n")); | |
2139 | /* Fall thru */ | |
2140 | case bfd_arch_frv: | |
2141 | case bfd_arch_i386: | |
2142 | BFD_ASSERT (htab->hgot != NULL | |
2143 | && ((htab->hgot->root.type | |
2144 | == bfd_link_hash_defined) | |
2145 | || (htab->hgot->root.type | |
2146 | == bfd_link_hash_defweak))); | |
2147 | address | |
2148 | += (htab->hgot->root.u.def.value | |
2149 | + htab->hgot->root.u.def.section->output_offset | |
2150 | + (htab->hgot->root.u.def.section->output_section | |
2151 | ->vma)); | |
2152 | break; | |
2153 | } | |
9e2a4898 JJ |
2154 | } |
2155 | break; | |
2156 | case DW_EH_PE_pcrel: | |
9c47c4c1 | 2157 | value += (bfd_vma) ent->offset - ent->new_offset; |
fc802241 RS |
2158 | address += (sec->output_section->vma |
2159 | + sec->output_offset | |
2160 | + ent->offset + 8); | |
9e2a4898 JJ |
2161 | break; |
2162 | } | |
6b2cc140 | 2163 | if (ent->make_relative) |
fc802241 RS |
2164 | value -= (sec->output_section->vma |
2165 | + sec->output_offset | |
2166 | + ent->new_offset + 8); | |
9e2a4898 | 2167 | write_value (abfd, buf, value, width); |
65765700 JJ |
2168 | } |
2169 | ||
ac685e6a JJ |
2170 | start = buf; |
2171 | ||
65765700 JJ |
2172 | if (hdr_info) |
2173 | { | |
cd9e734e AM |
2174 | /* The address calculation may overflow, giving us a |
2175 | value greater than 4G on a 32-bit target when | |
2176 | dwarf_vma is 64-bit. */ | |
2177 | if (sizeof (address) > 4 && ptr_size == 4) | |
2178 | address &= 0xffffffff; | |
2f0c68f2 CM |
2179 | hdr_info->u.dwarf.array[hdr_info->array_count].initial_loc |
2180 | = address; | |
2181 | hdr_info->u.dwarf.array[hdr_info->array_count].range | |
ae6c7e33 | 2182 | = read_value (abfd, buf + width, width, FALSE); |
2f0c68f2 | 2183 | hdr_info->u.dwarf.array[hdr_info->array_count++].fde |
fc802241 RS |
2184 | = (sec->output_section->vma |
2185 | + sec->output_offset | |
2186 | + ent->new_offset); | |
65765700 | 2187 | } |
9e2a4898 | 2188 | |
18e04883 | 2189 | if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel |
9f4b847e | 2190 | || cie->u.cie.make_lsda_relative) |
9e2a4898 | 2191 | { |
fda3ecf2 AM |
2192 | buf += ent->lsda_offset; |
2193 | width = get_DW_EH_PE_width (ent->lsda_encoding, ptr_size); | |
84f97cb6 | 2194 | value = read_value (abfd, buf, width, |
fda3ecf2 | 2195 | get_DW_EH_PE_signed (ent->lsda_encoding)); |
9e2a4898 JJ |
2196 | if (value) |
2197 | { | |
18e04883 | 2198 | if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel) |
9c47c4c1 | 2199 | value += (bfd_vma) ent->offset - ent->new_offset; |
9f4b847e | 2200 | else if (cie->u.cie.make_lsda_relative) |
fc802241 RS |
2201 | value -= (sec->output_section->vma |
2202 | + sec->output_offset | |
2203 | + ent->new_offset + 8 + ent->lsda_offset); | |
9e2a4898 JJ |
2204 | write_value (abfd, buf, value, width); |
2205 | } | |
2206 | } | |
6b2cc140 | 2207 | else if (ent->add_augmentation_size) |
353057a5 RS |
2208 | { |
2209 | /* Skip the PC and length and insert a zero byte for the | |
2210 | augmentation size. */ | |
2211 | buf += width * 2; | |
2212 | memmove (buf + 1, buf, end - buf); | |
2213 | *buf = 0; | |
2214 | } | |
ac685e6a JJ |
2215 | |
2216 | if (ent->set_loc) | |
2217 | { | |
2218 | /* Adjust DW_CFA_set_loc. */ | |
91d6fa6a | 2219 | unsigned int cnt; |
ac685e6a JJ |
2220 | bfd_vma new_offset; |
2221 | ||
2222 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
2223 | new_offset = ent->new_offset + 8 | |
2224 | + extra_augmentation_string_bytes (ent) | |
2225 | + extra_augmentation_data_bytes (ent); | |
2226 | ||
2227 | for (cnt = 1; cnt <= ent->set_loc[0]; cnt++) | |
2228 | { | |
ac685e6a JJ |
2229 | buf = start + ent->set_loc[cnt]; |
2230 | ||
2231 | value = read_value (abfd, buf, width, | |
2232 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
2233 | if (!value) | |
2234 | continue; | |
2235 | ||
18e04883 | 2236 | if ((ent->fde_encoding & 0x70) == DW_EH_PE_pcrel) |
9c47c4c1 | 2237 | value += (bfd_vma) ent->offset + 8 - new_offset; |
6b2cc140 | 2238 | if (ent->make_relative) |
fc802241 RS |
2239 | value -= (sec->output_section->vma |
2240 | + sec->output_offset | |
2241 | + new_offset + ent->set_loc[cnt]); | |
ac685e6a JJ |
2242 | write_value (abfd, buf, value, width); |
2243 | } | |
2244 | } | |
65765700 | 2245 | } |
65765700 JJ |
2246 | } |
2247 | ||
5dabe785 | 2248 | /* FIXME: octets_per_byte. */ |
65765700 | 2249 | return bfd_set_section_contents (abfd, sec->output_section, |
3472e2e9 AM |
2250 | contents, (file_ptr) sec->output_offset, |
2251 | sec->size); | |
65765700 JJ |
2252 | } |
2253 | ||
2254 | /* Helper function used to sort .eh_frame_hdr search table by increasing | |
2255 | VMA of FDE initial location. */ | |
2256 | ||
2257 | static int | |
c39a58e6 | 2258 | vma_compare (const void *a, const void *b) |
65765700 | 2259 | { |
a50b1753 NC |
2260 | const struct eh_frame_array_ent *p = (const struct eh_frame_array_ent *) a; |
2261 | const struct eh_frame_array_ent *q = (const struct eh_frame_array_ent *) b; | |
65765700 JJ |
2262 | if (p->initial_loc > q->initial_loc) |
2263 | return 1; | |
2264 | if (p->initial_loc < q->initial_loc) | |
2265 | return -1; | |
c2aaac08 AM |
2266 | if (p->range > q->range) |
2267 | return 1; | |
2268 | if (p->range < q->range) | |
2269 | return -1; | |
65765700 JJ |
2270 | return 0; |
2271 | } | |
2272 | ||
2f0c68f2 CM |
2273 | /* Reorder .eh_frame_entry sections to match the associated text sections. |
2274 | This routine is called during the final linking step, just before writing | |
2275 | the contents. At this stage, sections in the eh_frame_hdr_info are already | |
2276 | sorted in order of increasing text section address and so we simply need | |
2277 | to make the .eh_frame_entrys follow that same order. Note that it is | |
2278 | invalid for a linker script to try to force a particular order of | |
2279 | .eh_frame_entry sections. */ | |
2280 | ||
2281 | bfd_boolean | |
2282 | _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *info) | |
2283 | { | |
2284 | asection *sec = NULL; | |
2285 | asection *osec; | |
2286 | struct eh_frame_hdr_info *hdr_info; | |
2287 | unsigned int i; | |
2288 | bfd_vma offset; | |
2289 | struct bfd_link_order *p; | |
2290 | ||
2291 | hdr_info = &elf_hash_table (info)->eh_info; | |
2292 | ||
2293 | if (hdr_info->hdr_sec == NULL | |
2294 | || info->eh_frame_hdr_type != COMPACT_EH_HDR | |
2295 | || hdr_info->array_count == 0) | |
2296 | return TRUE; | |
2297 | ||
2298 | /* Change section output offsets to be in text section order. */ | |
2299 | offset = 8; | |
2300 | osec = hdr_info->u.compact.entries[0]->output_section; | |
2301 | for (i = 0; i < hdr_info->array_count; i++) | |
2302 | { | |
2303 | sec = hdr_info->u.compact.entries[i]; | |
2304 | if (sec->output_section != osec) | |
2305 | { | |
4eca0228 | 2306 | _bfd_error_handler |
dae82561 AM |
2307 | (_("Invalid output section for .eh_frame_entry: %A"), |
2308 | sec->output_section); | |
2f0c68f2 CM |
2309 | return FALSE; |
2310 | } | |
2311 | sec->output_offset = offset; | |
2312 | offset += sec->size; | |
2313 | } | |
2314 | ||
2315 | ||
2316 | /* Fix the link_order to match. */ | |
2317 | for (p = sec->output_section->map_head.link_order; p != NULL; p = p->next) | |
2318 | { | |
2319 | if (p->type != bfd_indirect_link_order) | |
2320 | abort(); | |
2321 | ||
2322 | p->offset = p->u.indirect.section->output_offset; | |
2323 | if (p->next != NULL) | |
07d6d2b8 | 2324 | i--; |
2f0c68f2 CM |
2325 | } |
2326 | ||
2327 | if (i != 0) | |
2328 | { | |
4eca0228 | 2329 | _bfd_error_handler |
dae82561 | 2330 | (_("Invalid contents in %A section"), osec); |
2f0c68f2 CM |
2331 | return FALSE; |
2332 | } | |
2333 | ||
2334 | return TRUE; | |
2335 | } | |
2336 | ||
2337 | /* The .eh_frame_hdr format for Compact EH frames: | |
2338 | ubyte version (2) | |
2339 | ubyte eh_ref_enc (DW_EH_PE_* encoding of typinfo references) | |
2340 | uint32_t count (Number of entries in table) | |
2341 | [array from .eh_frame_entry sections] */ | |
2342 | ||
2343 | static bfd_boolean | |
2344 | write_compact_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) | |
2345 | { | |
2346 | struct elf_link_hash_table *htab; | |
2347 | struct eh_frame_hdr_info *hdr_info; | |
2348 | asection *sec; | |
2349 | const struct elf_backend_data *bed; | |
2350 | bfd_vma count; | |
2351 | bfd_byte contents[8]; | |
2352 | unsigned int i; | |
2353 | ||
2354 | htab = elf_hash_table (info); | |
2355 | hdr_info = &htab->eh_info; | |
2356 | sec = hdr_info->hdr_sec; | |
2357 | ||
2358 | if (sec->size != 8) | |
2359 | abort(); | |
2360 | ||
2361 | for (i = 0; i < sizeof (contents); i++) | |
2362 | contents[i] = 0; | |
2363 | ||
2364 | contents[0] = COMPACT_EH_HDR; | |
2365 | bed = get_elf_backend_data (abfd); | |
2366 | ||
2367 | BFD_ASSERT (bed->compact_eh_encoding); | |
2368 | contents[1] = (*bed->compact_eh_encoding) (info); | |
2369 | ||
2370 | count = (sec->output_section->size - 8) / 8; | |
2371 | bfd_put_32 (abfd, count, contents + 4); | |
2372 | return bfd_set_section_contents (abfd, sec->output_section, contents, | |
2373 | (file_ptr) sec->output_offset, sec->size); | |
2374 | } | |
2375 | ||
2376 | /* The .eh_frame_hdr format for DWARF frames: | |
2377 | ||
65765700 | 2378 | ubyte version (currently 1) |
07d6d2b8 | 2379 | ubyte eh_frame_ptr_enc (DW_EH_PE_* encoding of pointer to start of |
65765700 JJ |
2380 | .eh_frame section) |
2381 | ubyte fde_count_enc (DW_EH_PE_* encoding of total FDE count | |
2382 | number (or DW_EH_PE_omit if there is no | |
2383 | binary search table computed)) | |
2384 | ubyte table_enc (DW_EH_PE_* encoding of binary search table, | |
2385 | or DW_EH_PE_omit if not present. | |
2386 | DW_EH_PE_datarel is using address of | |
2387 | .eh_frame_hdr section start as base) | |
2388 | [encoded] eh_frame_ptr (pointer to start of .eh_frame section) | |
2389 | optionally followed by: | |
2390 | [encoded] fde_count (total number of FDEs in .eh_frame section) | |
2391 | fde_count x [encoded] initial_loc, fde | |
2392 | (array of encoded pairs containing | |
2393 | FDE initial_location field and FDE address, | |
5ed6aba4 | 2394 | sorted by increasing initial_loc). */ |
65765700 | 2395 | |
2f0c68f2 CM |
2396 | static bfd_boolean |
2397 | write_dwarf_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) | |
65765700 | 2398 | { |
126495ed | 2399 | struct elf_link_hash_table *htab; |
65765700 | 2400 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 2401 | asection *sec; |
9f7c3e5e | 2402 | bfd_boolean retval = TRUE; |
65765700 | 2403 | |
126495ed AM |
2404 | htab = elf_hash_table (info); |
2405 | hdr_info = &htab->eh_info; | |
2406 | sec = hdr_info->hdr_sec; | |
2f0c68f2 CM |
2407 | bfd_byte *contents; |
2408 | asection *eh_frame_sec; | |
2409 | bfd_size_type size; | |
2410 | bfd_vma encoded_eh_frame; | |
2411 | ||
2412 | size = EH_FRAME_HDR_SIZE; | |
2413 | if (hdr_info->u.dwarf.array | |
2414 | && hdr_info->array_count == hdr_info->u.dwarf.fde_count) | |
2415 | size += 4 + hdr_info->u.dwarf.fde_count * 8; | |
2416 | contents = (bfd_byte *) bfd_malloc (size); | |
2417 | if (contents == NULL) | |
2418 | return FALSE; | |
65765700 | 2419 | |
2f0c68f2 CM |
2420 | eh_frame_sec = bfd_get_section_by_name (abfd, ".eh_frame"); |
2421 | if (eh_frame_sec == NULL) | |
5ed6aba4 | 2422 | { |
2f0c68f2 CM |
2423 | free (contents); |
2424 | return FALSE; | |
2425 | } | |
65765700 | 2426 | |
2f0c68f2 CM |
2427 | memset (contents, 0, EH_FRAME_HDR_SIZE); |
2428 | /* Version. */ | |
2429 | contents[0] = 1; | |
2430 | /* .eh_frame offset. */ | |
2431 | contents[1] = get_elf_backend_data (abfd)->elf_backend_encode_eh_address | |
2432 | (abfd, info, eh_frame_sec, 0, sec, 4, &encoded_eh_frame); | |
ec3391e7 | 2433 | |
2f0c68f2 CM |
2434 | if (hdr_info->u.dwarf.array |
2435 | && hdr_info->array_count == hdr_info->u.dwarf.fde_count) | |
2436 | { | |
2437 | /* FDE count encoding. */ | |
2438 | contents[2] = DW_EH_PE_udata4; | |
2439 | /* Search table encoding. */ | |
2440 | contents[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4; | |
2441 | } | |
2442 | else | |
2443 | { | |
2444 | contents[2] = DW_EH_PE_omit; | |
2445 | contents[3] = DW_EH_PE_omit; | |
2446 | } | |
2447 | bfd_put_32 (abfd, encoded_eh_frame, contents + 4); | |
ec3391e7 | 2448 | |
2f0c68f2 CM |
2449 | if (contents[2] != DW_EH_PE_omit) |
2450 | { | |
2451 | unsigned int i; | |
2452 | bfd_boolean overlap, overflow; | |
2453 | ||
2454 | bfd_put_32 (abfd, hdr_info->u.dwarf.fde_count, | |
2455 | contents + EH_FRAME_HDR_SIZE); | |
2456 | qsort (hdr_info->u.dwarf.array, hdr_info->u.dwarf.fde_count, | |
2457 | sizeof (*hdr_info->u.dwarf.array), vma_compare); | |
2458 | overlap = FALSE; | |
2459 | overflow = FALSE; | |
2460 | for (i = 0; i < hdr_info->u.dwarf.fde_count; i++) | |
9f7c3e5e | 2461 | { |
2f0c68f2 CM |
2462 | bfd_vma val; |
2463 | ||
2464 | val = hdr_info->u.dwarf.array[i].initial_loc | |
2465 | - sec->output_section->vma; | |
2466 | val = ((val & 0xffffffff) ^ 0x80000000) - 0x80000000; | |
2467 | if (elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64 | |
2468 | && (hdr_info->u.dwarf.array[i].initial_loc | |
2469 | != sec->output_section->vma + val)) | |
2470 | overflow = TRUE; | |
2471 | bfd_put_32 (abfd, val, contents + EH_FRAME_HDR_SIZE + i * 8 + 4); | |
2472 | val = hdr_info->u.dwarf.array[i].fde - 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].fde | |
2476 | != sec->output_section->vma + val)) | |
2477 | overflow = TRUE; | |
2478 | bfd_put_32 (abfd, val, contents + EH_FRAME_HDR_SIZE + i * 8 + 8); | |
2479 | if (i != 0 | |
2480 | && (hdr_info->u.dwarf.array[i].initial_loc | |
2481 | < (hdr_info->u.dwarf.array[i - 1].initial_loc | |
2482 | + hdr_info->u.dwarf.array[i - 1].range))) | |
2483 | overlap = TRUE; | |
9f7c3e5e | 2484 | } |
2f0c68f2 CM |
2485 | if (overflow) |
2486 | (*info->callbacks->einfo) (_("%P: .eh_frame_hdr entry overflow.\n")); | |
2487 | if (overlap) | |
2488 | (*info->callbacks->einfo) | |
2489 | (_("%P: .eh_frame_hdr refers to overlapping FDEs.\n")); | |
2490 | if (overflow || overlap) | |
9f7c3e5e | 2491 | { |
2f0c68f2 CM |
2492 | bfd_set_error (bfd_error_bad_value); |
2493 | retval = FALSE; | |
9f7c3e5e | 2494 | } |
2f0c68f2 | 2495 | } |
65765700 | 2496 | |
2f0c68f2 CM |
2497 | /* FIXME: octets_per_byte. */ |
2498 | if (!bfd_set_section_contents (abfd, sec->output_section, contents, | |
2499 | (file_ptr) sec->output_offset, | |
2500 | sec->size)) | |
2501 | retval = FALSE; | |
2502 | free (contents); | |
2503 | ||
2504 | if (hdr_info->u.dwarf.array != NULL) | |
2505 | free (hdr_info->u.dwarf.array); | |
2506 | return retval; | |
2507 | } | |
9f7c3e5e | 2508 | |
2f0c68f2 CM |
2509 | /* Write out .eh_frame_hdr section. This must be called after |
2510 | _bfd_elf_write_section_eh_frame has been called on all input | |
2511 | .eh_frame sections. */ | |
ae6c7e33 | 2512 | |
2f0c68f2 CM |
2513 | bfd_boolean |
2514 | _bfd_elf_write_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) | |
2515 | { | |
2516 | struct elf_link_hash_table *htab; | |
2517 | struct eh_frame_hdr_info *hdr_info; | |
2518 | asection *sec; | |
aa8f4d1e | 2519 | |
2f0c68f2 CM |
2520 | htab = elf_hash_table (info); |
2521 | hdr_info = &htab->eh_info; | |
2522 | sec = hdr_info->hdr_sec; | |
65765700 | 2523 | |
2f0c68f2 CM |
2524 | if (info->eh_frame_hdr_type == 0 || sec == NULL) |
2525 | return TRUE; | |
2526 | ||
2527 | if (info->eh_frame_hdr_type == COMPACT_EH_HDR) | |
2528 | return write_compact_eh_frame_hdr (abfd, info); | |
2529 | else | |
2530 | return write_dwarf_eh_frame_hdr (abfd, info); | |
65765700 | 2531 | } |
ec3391e7 | 2532 | |
8c946ed5 RS |
2533 | /* Return the width of FDE addresses. This is the default implementation. */ |
2534 | ||
2535 | unsigned int | |
76c20d54 | 2536 | _bfd_elf_eh_frame_address_size (bfd *abfd, const asection *sec ATTRIBUTE_UNUSED) |
8c946ed5 RS |
2537 | { |
2538 | return elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64 ? 8 : 4; | |
2539 | } | |
2540 | ||
ec3391e7 AO |
2541 | /* Decide whether we can use a PC-relative encoding within the given |
2542 | EH frame section. This is the default implementation. */ | |
2543 | ||
2544 | bfd_boolean | |
2545 | _bfd_elf_can_make_relative (bfd *input_bfd ATTRIBUTE_UNUSED, | |
2546 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
2547 | asection *eh_frame_section ATTRIBUTE_UNUSED) | |
2548 | { | |
2549 | return TRUE; | |
2550 | } | |
2551 | ||
2552 | /* Select an encoding for the given address. Preference is given to | |
2553 | PC-relative addressing modes. */ | |
2554 | ||
2555 | bfd_byte | |
2556 | _bfd_elf_encode_eh_address (bfd *abfd ATTRIBUTE_UNUSED, | |
2557 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
2558 | asection *osec, bfd_vma offset, | |
2559 | asection *loc_sec, bfd_vma loc_offset, | |
2560 | bfd_vma *encoded) | |
2561 | { | |
2562 | *encoded = osec->vma + offset - | |
2563 | (loc_sec->output_section->vma + loc_sec->output_offset + loc_offset); | |
2564 | return DW_EH_PE_pcrel | DW_EH_PE_sdata4; | |
2565 | } |