Commit | Line | Data |
---|---|---|
65765700 | 1 | /* .eh_frame section optimization. |
63752a75 | 2 | Copyright 2001, 2002, 2003, 2004, 2005, 2006 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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
3e110533 | 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
65765700 JJ |
20 | |
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
23 | #include "libbfd.h" | |
24 | #include "elf-bfd.h" | |
25 | #include "elf/dwarf2.h" | |
26 | ||
27 | #define EH_FRAME_HDR_SIZE 8 | |
28 | ||
2c42be65 RS |
29 | /* If *ITER hasn't reached END yet, read the next byte into *RESULT and |
30 | move onto the next byte. Return true on success. */ | |
31 | ||
32 | static inline bfd_boolean | |
33 | read_byte (bfd_byte **iter, bfd_byte *end, unsigned char *result) | |
34 | { | |
35 | if (*iter >= end) | |
36 | return FALSE; | |
37 | *result = *((*iter)++); | |
38 | return TRUE; | |
39 | } | |
40 | ||
41 | /* Move *ITER over LENGTH bytes, or up to END, whichever is closer. | |
42 | Return true it was possible to move LENGTH bytes. */ | |
43 | ||
44 | static inline bfd_boolean | |
45 | skip_bytes (bfd_byte **iter, bfd_byte *end, bfd_size_type length) | |
46 | { | |
47 | if ((bfd_size_type) (end - *iter) < length) | |
48 | { | |
49 | *iter = end; | |
50 | return FALSE; | |
51 | } | |
52 | *iter += length; | |
53 | return TRUE; | |
54 | } | |
55 | ||
56 | /* Move *ITER over an leb128, stopping at END. Return true if the end | |
57 | of the leb128 was found. */ | |
58 | ||
59 | static bfd_boolean | |
60 | skip_leb128 (bfd_byte **iter, bfd_byte *end) | |
61 | { | |
62 | unsigned char byte; | |
63 | do | |
64 | if (!read_byte (iter, end, &byte)) | |
65 | return FALSE; | |
66 | while (byte & 0x80); | |
67 | return TRUE; | |
68 | } | |
69 | ||
70 | /* Like skip_leb128, but treat the leb128 as an unsigned value and | |
71 | store it in *VALUE. */ | |
72 | ||
73 | static bfd_boolean | |
74 | read_uleb128 (bfd_byte **iter, bfd_byte *end, bfd_vma *value) | |
75 | { | |
76 | bfd_byte *start, *p; | |
77 | ||
78 | start = *iter; | |
79 | if (!skip_leb128 (iter, end)) | |
80 | return FALSE; | |
81 | ||
82 | p = *iter; | |
83 | *value = *--p; | |
84 | while (p > start) | |
85 | *value = (*value << 7) | (*--p & 0x7f); | |
86 | ||
87 | return TRUE; | |
88 | } | |
89 | ||
90 | /* Like read_uleb128, but for signed values. */ | |
91 | ||
92 | static bfd_boolean | |
93 | read_sleb128 (bfd_byte **iter, bfd_byte *end, bfd_signed_vma *value) | |
94 | { | |
95 | bfd_byte *start, *p; | |
96 | ||
97 | start = *iter; | |
98 | if (!skip_leb128 (iter, end)) | |
99 | return FALSE; | |
100 | ||
101 | p = *iter; | |
102 | *value = ((*--p & 0x7f) ^ 0x40) - 0x40; | |
103 | while (p > start) | |
104 | *value = (*value << 7) | (*--p & 0x7f); | |
105 | ||
106 | return TRUE; | |
107 | } | |
65765700 JJ |
108 | |
109 | /* Return 0 if either encoding is variable width, or not yet known to bfd. */ | |
110 | ||
111 | static | |
c39a58e6 | 112 | int get_DW_EH_PE_width (int encoding, int ptr_size) |
65765700 JJ |
113 | { |
114 | /* DW_EH_PE_ values of 0x60 and 0x70 weren't defined at the time .eh_frame | |
115 | was added to bfd. */ | |
116 | if ((encoding & 0x60) == 0x60) | |
117 | return 0; | |
118 | ||
119 | switch (encoding & 7) | |
120 | { | |
121 | case DW_EH_PE_udata2: return 2; | |
122 | case DW_EH_PE_udata4: return 4; | |
123 | case DW_EH_PE_udata8: return 8; | |
124 | case DW_EH_PE_absptr: return ptr_size; | |
125 | default: | |
126 | break; | |
127 | } | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
84f97cb6 AS |
132 | #define get_DW_EH_PE_signed(encoding) (((encoding) & DW_EH_PE_signed) != 0) |
133 | ||
9e2a4898 JJ |
134 | /* Read a width sized value from memory. */ |
135 | ||
136 | static bfd_vma | |
c39a58e6 | 137 | read_value (bfd *abfd, bfd_byte *buf, int width, int is_signed) |
9e2a4898 JJ |
138 | { |
139 | bfd_vma value; | |
140 | ||
141 | switch (width) | |
142 | { | |
84f97cb6 AS |
143 | case 2: |
144 | if (is_signed) | |
145 | value = bfd_get_signed_16 (abfd, buf); | |
146 | else | |
147 | value = bfd_get_16 (abfd, buf); | |
148 | break; | |
149 | case 4: | |
150 | if (is_signed) | |
151 | value = bfd_get_signed_32 (abfd, buf); | |
152 | else | |
153 | value = bfd_get_32 (abfd, buf); | |
154 | break; | |
155 | case 8: | |
156 | if (is_signed) | |
157 | value = bfd_get_signed_64 (abfd, buf); | |
158 | else | |
159 | value = bfd_get_64 (abfd, buf); | |
160 | break; | |
161 | default: | |
162 | BFD_FAIL (); | |
163 | return 0; | |
9e2a4898 JJ |
164 | } |
165 | ||
166 | return value; | |
167 | } | |
b34976b6 | 168 | |
9e2a4898 JJ |
169 | /* Store a width sized value to memory. */ |
170 | ||
171 | static void | |
c39a58e6 | 172 | write_value (bfd *abfd, bfd_byte *buf, bfd_vma value, int width) |
9e2a4898 JJ |
173 | { |
174 | switch (width) | |
175 | { | |
176 | case 2: bfd_put_16 (abfd, value, buf); break; | |
177 | case 4: bfd_put_32 (abfd, value, buf); break; | |
178 | case 8: bfd_put_64 (abfd, value, buf); break; | |
179 | default: BFD_FAIL (); | |
180 | } | |
181 | } | |
182 | ||
65765700 JJ |
183 | /* Return zero if C1 and C2 CIEs can be merged. */ |
184 | ||
185 | static | |
c39a58e6 | 186 | int cie_compare (struct cie *c1, struct cie *c2) |
65765700 JJ |
187 | { |
188 | if (c1->hdr.length == c2->hdr.length | |
189 | && c1->version == c2->version | |
190 | && strcmp (c1->augmentation, c2->augmentation) == 0 | |
191 | && strcmp (c1->augmentation, "eh") != 0 | |
192 | && c1->code_align == c2->code_align | |
193 | && c1->data_align == c2->data_align | |
194 | && c1->ra_column == c2->ra_column | |
195 | && c1->augmentation_size == c2->augmentation_size | |
196 | && c1->personality == c2->personality | |
197 | && c1->per_encoding == c2->per_encoding | |
198 | && c1->lsda_encoding == c2->lsda_encoding | |
199 | && c1->fde_encoding == c2->fde_encoding | |
c39a58e6 | 200 | && c1->initial_insn_length == c2->initial_insn_length |
65765700 JJ |
201 | && memcmp (c1->initial_instructions, |
202 | c2->initial_instructions, | |
203 | c1->initial_insn_length) == 0) | |
204 | return 0; | |
205 | ||
206 | return 1; | |
207 | } | |
208 | ||
353057a5 RS |
209 | /* Return the number of extra bytes that we'll be inserting into |
210 | ENTRY's augmentation string. */ | |
211 | ||
212 | static INLINE unsigned int | |
213 | extra_augmentation_string_bytes (struct eh_cie_fde *entry) | |
214 | { | |
215 | unsigned int size = 0; | |
216 | if (entry->cie) | |
217 | { | |
218 | if (entry->add_augmentation_size) | |
219 | size++; | |
220 | if (entry->add_fde_encoding) | |
221 | size++; | |
222 | } | |
223 | return size; | |
224 | } | |
225 | ||
226 | /* Likewise ENTRY's augmentation data. */ | |
227 | ||
228 | static INLINE unsigned int | |
229 | extra_augmentation_data_bytes (struct eh_cie_fde *entry) | |
230 | { | |
231 | unsigned int size = 0; | |
232 | if (entry->cie) | |
233 | { | |
234 | if (entry->add_augmentation_size) | |
235 | size++; | |
236 | if (entry->add_fde_encoding) | |
237 | size++; | |
238 | } | |
239 | else | |
240 | { | |
241 | if (entry->cie_inf->add_augmentation_size) | |
242 | size++; | |
243 | } | |
244 | return size; | |
245 | } | |
246 | ||
247 | /* Return the size that ENTRY will have in the output. ALIGNMENT is the | |
248 | required alignment of ENTRY in bytes. */ | |
249 | ||
250 | static unsigned int | |
251 | size_of_output_cie_fde (struct eh_cie_fde *entry, unsigned int alignment) | |
252 | { | |
253 | if (entry->removed) | |
254 | return 0; | |
255 | if (entry->size == 4) | |
256 | return 4; | |
257 | return (entry->size | |
258 | + extra_augmentation_string_bytes (entry) | |
259 | + extra_augmentation_data_bytes (entry) | |
260 | + alignment - 1) & -alignment; | |
261 | } | |
262 | ||
dcf507a6 RS |
263 | /* Assume that the bytes between *ITER and END are CFA instructions. |
264 | Try to move *ITER past the first instruction and return true on | |
265 | success. ENCODED_PTR_WIDTH gives the width of pointer entries. */ | |
266 | ||
267 | static bfd_boolean | |
268 | skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) | |
269 | { | |
270 | bfd_byte op; | |
271 | bfd_vma length; | |
272 | ||
273 | if (!read_byte (iter, end, &op)) | |
274 | return FALSE; | |
275 | ||
ac685e6a | 276 | switch (op & 0xc0 ? op & 0xc0 : op) |
dcf507a6 RS |
277 | { |
278 | case DW_CFA_nop: | |
279 | case DW_CFA_advance_loc: | |
280 | case DW_CFA_restore: | |
ac685e6a JJ |
281 | case DW_CFA_remember_state: |
282 | case DW_CFA_restore_state: | |
283 | case DW_CFA_GNU_window_save: | |
dcf507a6 RS |
284 | /* No arguments. */ |
285 | return TRUE; | |
286 | ||
287 | case DW_CFA_offset: | |
288 | case DW_CFA_restore_extended: | |
289 | case DW_CFA_undefined: | |
290 | case DW_CFA_same_value: | |
291 | case DW_CFA_def_cfa_register: | |
292 | case DW_CFA_def_cfa_offset: | |
293 | case DW_CFA_def_cfa_offset_sf: | |
294 | case DW_CFA_GNU_args_size: | |
295 | /* One leb128 argument. */ | |
296 | return skip_leb128 (iter, end); | |
297 | ||
ac685e6a JJ |
298 | case DW_CFA_val_offset: |
299 | case DW_CFA_val_offset_sf: | |
dcf507a6 RS |
300 | case DW_CFA_offset_extended: |
301 | case DW_CFA_register: | |
302 | case DW_CFA_def_cfa: | |
303 | case DW_CFA_offset_extended_sf: | |
304 | case DW_CFA_GNU_negative_offset_extended: | |
305 | case DW_CFA_def_cfa_sf: | |
306 | /* Two leb128 arguments. */ | |
307 | return (skip_leb128 (iter, end) | |
308 | && skip_leb128 (iter, end)); | |
309 | ||
310 | case DW_CFA_def_cfa_expression: | |
311 | /* A variable-length argument. */ | |
312 | return (read_uleb128 (iter, end, &length) | |
313 | && skip_bytes (iter, end, length)); | |
314 | ||
315 | case DW_CFA_expression: | |
ac685e6a | 316 | case DW_CFA_val_expression: |
dcf507a6 RS |
317 | /* A leb128 followed by a variable-length argument. */ |
318 | return (skip_leb128 (iter, end) | |
319 | && read_uleb128 (iter, end, &length) | |
320 | && skip_bytes (iter, end, length)); | |
321 | ||
322 | case DW_CFA_set_loc: | |
323 | return skip_bytes (iter, end, encoded_ptr_width); | |
324 | ||
325 | case DW_CFA_advance_loc1: | |
326 | return skip_bytes (iter, end, 1); | |
327 | ||
328 | case DW_CFA_advance_loc2: | |
329 | return skip_bytes (iter, end, 2); | |
330 | ||
331 | case DW_CFA_advance_loc4: | |
332 | return skip_bytes (iter, end, 4); | |
333 | ||
334 | case DW_CFA_MIPS_advance_loc8: | |
335 | return skip_bytes (iter, end, 8); | |
336 | ||
337 | default: | |
338 | return FALSE; | |
339 | } | |
340 | } | |
341 | ||
342 | /* Try to interpret the bytes between BUF and END as CFA instructions. | |
343 | If every byte makes sense, return a pointer to the first DW_CFA_nop | |
344 | padding byte, or END if there is no padding. Return null otherwise. | |
345 | ENCODED_PTR_WIDTH is as for skip_cfa_op. */ | |
346 | ||
347 | static bfd_byte * | |
ac685e6a JJ |
348 | skip_non_nops (bfd_byte *buf, bfd_byte *end, unsigned int encoded_ptr_width, |
349 | unsigned int *set_loc_count) | |
dcf507a6 RS |
350 | { |
351 | bfd_byte *last; | |
352 | ||
353 | last = buf; | |
354 | while (buf < end) | |
355 | if (*buf == DW_CFA_nop) | |
356 | buf++; | |
357 | else | |
358 | { | |
ac685e6a JJ |
359 | if (*buf == DW_CFA_set_loc) |
360 | ++*set_loc_count; | |
dcf507a6 RS |
361 | if (!skip_cfa_op (&buf, end, encoded_ptr_width)) |
362 | return 0; | |
363 | last = buf; | |
364 | } | |
365 | return last; | |
366 | } | |
367 | ||
65765700 JJ |
368 | /* This function is called for each input file before the .eh_frame |
369 | section is relocated. It discards duplicate CIEs and FDEs for discarded | |
b34976b6 | 370 | functions. The function returns TRUE iff any entries have been |
65765700 JJ |
371 | deleted. */ |
372 | ||
b34976b6 | 373 | bfd_boolean |
c39a58e6 AM |
374 | _bfd_elf_discard_section_eh_frame |
375 | (bfd *abfd, struct bfd_link_info *info, asection *sec, | |
376 | bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *), | |
377 | struct elf_reloc_cookie *cookie) | |
65765700 | 378 | { |
acfe5567 RS |
379 | #define REQUIRE(COND) \ |
380 | do \ | |
381 | if (!(COND)) \ | |
382 | goto free_no_table; \ | |
383 | while (0) | |
384 | ||
65765700 JJ |
385 | bfd_byte *ehbuf = NULL, *buf; |
386 | bfd_byte *last_cie, *last_fde; | |
fda3ecf2 | 387 | struct eh_cie_fde *ent, *last_cie_inf, *this_inf; |
65765700 JJ |
388 | struct cie_header hdr; |
389 | struct cie cie; | |
126495ed | 390 | struct elf_link_hash_table *htab; |
65765700 | 391 | struct eh_frame_hdr_info *hdr_info; |
68f69152 | 392 | struct eh_frame_sec_info *sec_info = NULL; |
fda3ecf2 | 393 | unsigned int cie_usage_count, offset; |
65765700 JJ |
394 | unsigned int ptr_size; |
395 | ||
eea6121a | 396 | if (sec->size == 0) |
65765700 JJ |
397 | { |
398 | /* This file does not contain .eh_frame information. */ | |
b34976b6 | 399 | return FALSE; |
65765700 JJ |
400 | } |
401 | ||
e460dd0d | 402 | if (bfd_is_abs_section (sec->output_section)) |
65765700 JJ |
403 | { |
404 | /* At least one of the sections is being discarded from the | |
3472e2e9 | 405 | link, so we should just ignore them. */ |
b34976b6 | 406 | return FALSE; |
65765700 JJ |
407 | } |
408 | ||
126495ed AM |
409 | htab = elf_hash_table (info); |
410 | hdr_info = &htab->eh_info; | |
68f69152 | 411 | |
65765700 JJ |
412 | /* Read the frame unwind information from abfd. */ |
413 | ||
acfe5567 | 414 | REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf)); |
68f69152 | 415 | |
eea6121a | 416 | if (sec->size >= 4 |
65765700 JJ |
417 | && bfd_get_32 (abfd, ehbuf) == 0 |
418 | && cookie->rel == cookie->relend) | |
419 | { | |
420 | /* Empty .eh_frame section. */ | |
421 | free (ehbuf); | |
b34976b6 | 422 | return FALSE; |
65765700 JJ |
423 | } |
424 | ||
65765700 JJ |
425 | /* If .eh_frame section size doesn't fit into int, we cannot handle |
426 | it (it would need to use 64-bit .eh_frame format anyway). */ | |
acfe5567 | 427 | REQUIRE (sec->size == (unsigned int) sec->size); |
65765700 | 428 | |
8c946ed5 RS |
429 | ptr_size = (get_elf_backend_data (abfd) |
430 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
431 | REQUIRE (ptr_size != 0); | |
432 | ||
65765700 JJ |
433 | buf = ehbuf; |
434 | last_cie = NULL; | |
fda3ecf2 | 435 | last_cie_inf = NULL; |
65765700 JJ |
436 | memset (&cie, 0, sizeof (cie)); |
437 | cie_usage_count = 0; | |
65765700 JJ |
438 | sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info) |
439 | + 99 * sizeof (struct eh_cie_fde)); | |
acfe5567 | 440 | REQUIRE (sec_info); |
eea6121a | 441 | |
65765700 JJ |
442 | sec_info->alloced = 100; |
443 | ||
444 | #define ENSURE_NO_RELOCS(buf) \ | |
acfe5567 RS |
445 | REQUIRE (!(cookie->rel < cookie->relend \ |
446 | && (cookie->rel->r_offset \ | |
447 | < (bfd_size_type) ((buf) - ehbuf)) \ | |
448 | && cookie->rel->r_info != 0)) | |
65765700 JJ |
449 | |
450 | #define SKIP_RELOCS(buf) \ | |
451 | while (cookie->rel < cookie->relend \ | |
3472e2e9 | 452 | && (cookie->rel->r_offset \ |
65765700 JJ |
453 | < (bfd_size_type) ((buf) - ehbuf))) \ |
454 | cookie->rel++ | |
455 | ||
456 | #define GET_RELOC(buf) \ | |
457 | ((cookie->rel < cookie->relend \ | |
458 | && (cookie->rel->r_offset \ | |
3472e2e9 | 459 | == (bfd_size_type) ((buf) - ehbuf))) \ |
65765700 JJ |
460 | ? cookie->rel : NULL) |
461 | ||
462 | for (;;) | |
463 | { | |
f075ee0c | 464 | char *aug; |
ac685e6a | 465 | bfd_byte *start, *end, *insns, *insns_end; |
2c42be65 | 466 | bfd_size_type length; |
ac685e6a | 467 | unsigned int set_loc_count; |
65765700 JJ |
468 | |
469 | if (sec_info->count == sec_info->alloced) | |
470 | { | |
fda3ecf2 | 471 | struct eh_cie_fde *old_entry = sec_info->entry; |
65765700 JJ |
472 | sec_info = bfd_realloc (sec_info, |
473 | sizeof (struct eh_frame_sec_info) | |
fda3ecf2 AM |
474 | + ((sec_info->alloced + 99) |
475 | * sizeof (struct eh_cie_fde))); | |
acfe5567 | 476 | REQUIRE (sec_info); |
65765700 JJ |
477 | |
478 | memset (&sec_info->entry[sec_info->alloced], 0, | |
479 | 100 * sizeof (struct eh_cie_fde)); | |
480 | sec_info->alloced += 100; | |
fda3ecf2 AM |
481 | |
482 | /* Now fix any pointers into the array. */ | |
483 | if (last_cie_inf >= old_entry | |
484 | && last_cie_inf < old_entry + sec_info->count) | |
485 | last_cie_inf = sec_info->entry + (last_cie_inf - old_entry); | |
65765700 JJ |
486 | } |
487 | ||
fda3ecf2 | 488 | this_inf = sec_info->entry + sec_info->count; |
65765700 JJ |
489 | last_fde = buf; |
490 | /* If we are at the end of the section, we still need to decide | |
491 | on whether to output or discard last encountered CIE (if any). */ | |
eea6121a | 492 | if ((bfd_size_type) (buf - ehbuf) == sec->size) |
2c42be65 | 493 | { |
1808e341 | 494 | hdr.length = 0; |
2c42be65 RS |
495 | hdr.id = (unsigned int) -1; |
496 | end = buf; | |
497 | } | |
65765700 JJ |
498 | else |
499 | { | |
acfe5567 | 500 | /* Read the length of the entry. */ |
2c42be65 RS |
501 | REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); |
502 | hdr.length = bfd_get_32 (abfd, buf - 4); | |
acfe5567 RS |
503 | |
504 | /* 64-bit .eh_frame is not supported. */ | |
505 | REQUIRE (hdr.length != 0xffffffff); | |
506 | ||
507 | /* The CIE/FDE must be fully contained in this input section. */ | |
508 | REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr.length <= sec->size); | |
2c42be65 | 509 | end = buf + hdr.length; |
65765700 | 510 | |
fda3ecf2 AM |
511 | this_inf->offset = last_fde - ehbuf; |
512 | this_inf->size = 4 + hdr.length; | |
65765700 JJ |
513 | |
514 | if (hdr.length == 0) | |
515 | { | |
acfe5567 RS |
516 | /* A zero-length CIE should only be found at the end of |
517 | the section. */ | |
518 | REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); | |
65765700 JJ |
519 | ENSURE_NO_RELOCS (buf); |
520 | sec_info->count++; | |
521 | /* Now just finish last encountered CIE processing and break | |
522 | the loop. */ | |
523 | hdr.id = (unsigned int) -1; | |
524 | } | |
525 | else | |
526 | { | |
2c42be65 RS |
527 | REQUIRE (skip_bytes (&buf, end, 4)); |
528 | hdr.id = bfd_get_32 (abfd, buf - 4); | |
acfe5567 | 529 | REQUIRE (hdr.id != (unsigned int) -1); |
65765700 JJ |
530 | } |
531 | } | |
532 | ||
533 | if (hdr.id == 0 || hdr.id == (unsigned int) -1) | |
534 | { | |
535 | unsigned int initial_insn_length; | |
536 | ||
537 | /* CIE */ | |
538 | if (last_cie != NULL) | |
539 | { | |
73722af0 AM |
540 | /* Now check if this CIE is identical to the last CIE, |
541 | in which case we can remove it provided we adjust | |
542 | all FDEs. Also, it can be removed if we have removed | |
543 | all FDEs using it. */ | |
1049f94e | 544 | if ((!info->relocatable |
9da84788 L |
545 | && hdr_info->last_cie_sec |
546 | && (sec->output_section | |
547 | == hdr_info->last_cie_sec->output_section) | |
73722af0 | 548 | && cie_compare (&cie, &hdr_info->last_cie) == 0) |
65765700 | 549 | || cie_usage_count == 0) |
353057a5 | 550 | last_cie_inf->removed = 1; |
65765700 JJ |
551 | else |
552 | { | |
553 | hdr_info->last_cie = cie; | |
554 | hdr_info->last_cie_sec = sec; | |
fda3ecf2 AM |
555 | last_cie_inf->make_relative = cie.make_relative; |
556 | last_cie_inf->make_lsda_relative = cie.make_lsda_relative; | |
557 | last_cie_inf->per_encoding_relative | |
09ae86c2 | 558 | = (cie.per_encoding & 0x70) == DW_EH_PE_pcrel; |
65765700 JJ |
559 | } |
560 | } | |
561 | ||
562 | if (hdr.id == (unsigned int) -1) | |
563 | break; | |
564 | ||
fda3ecf2 AM |
565 | last_cie_inf = this_inf; |
566 | this_inf->cie = 1; | |
65765700 JJ |
567 | |
568 | cie_usage_count = 0; | |
569 | memset (&cie, 0, sizeof (cie)); | |
570 | cie.hdr = hdr; | |
ac685e6a | 571 | start = buf; |
2c42be65 | 572 | REQUIRE (read_byte (&buf, end, &cie.version)); |
65765700 JJ |
573 | |
574 | /* Cannot handle unknown versions. */ | |
acfe5567 | 575 | REQUIRE (cie.version == 1 || cie.version == 3); |
f075ee0c | 576 | REQUIRE (strlen ((char *) buf) < sizeof (cie.augmentation)); |
65765700 | 577 | |
f075ee0c AM |
578 | strcpy (cie.augmentation, (char *) buf); |
579 | buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1; | |
65765700 JJ |
580 | ENSURE_NO_RELOCS (buf); |
581 | if (buf[0] == 'e' && buf[1] == 'h') | |
582 | { | |
583 | /* GCC < 3.0 .eh_frame CIE */ | |
584 | /* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__ | |
585 | is private to each CIE, so we don't need it for anything. | |
586 | Just skip it. */ | |
2c42be65 | 587 | REQUIRE (skip_bytes (&buf, end, ptr_size)); |
65765700 JJ |
588 | SKIP_RELOCS (buf); |
589 | } | |
2c42be65 RS |
590 | REQUIRE (read_uleb128 (&buf, end, &cie.code_align)); |
591 | REQUIRE (read_sleb128 (&buf, end, &cie.data_align)); | |
0da76f83 | 592 | if (cie.version == 1) |
2c42be65 RS |
593 | { |
594 | REQUIRE (buf < end); | |
595 | cie.ra_column = *buf++; | |
596 | } | |
0da76f83 | 597 | else |
2c42be65 | 598 | REQUIRE (read_uleb128 (&buf, end, &cie.ra_column)); |
65765700 JJ |
599 | ENSURE_NO_RELOCS (buf); |
600 | cie.lsda_encoding = DW_EH_PE_omit; | |
601 | cie.fde_encoding = DW_EH_PE_omit; | |
602 | cie.per_encoding = DW_EH_PE_omit; | |
603 | aug = cie.augmentation; | |
604 | if (aug[0] != 'e' || aug[1] != 'h') | |
605 | { | |
606 | if (*aug == 'z') | |
607 | { | |
608 | aug++; | |
2c42be65 | 609 | REQUIRE (read_uleb128 (&buf, end, &cie.augmentation_size)); |
65765700 JJ |
610 | ENSURE_NO_RELOCS (buf); |
611 | } | |
612 | ||
613 | while (*aug != '\0') | |
614 | switch (*aug++) | |
615 | { | |
616 | case 'L': | |
2c42be65 | 617 | REQUIRE (read_byte (&buf, end, &cie.lsda_encoding)); |
65765700 | 618 | ENSURE_NO_RELOCS (buf); |
acfe5567 | 619 | REQUIRE (get_DW_EH_PE_width (cie.lsda_encoding, ptr_size)); |
65765700 JJ |
620 | break; |
621 | case 'R': | |
2c42be65 | 622 | REQUIRE (read_byte (&buf, end, &cie.fde_encoding)); |
65765700 | 623 | ENSURE_NO_RELOCS (buf); |
acfe5567 | 624 | REQUIRE (get_DW_EH_PE_width (cie.fde_encoding, ptr_size)); |
65765700 | 625 | break; |
63752a75 JJ |
626 | case 'S': |
627 | break; | |
65765700 JJ |
628 | case 'P': |
629 | { | |
630 | int per_width; | |
631 | ||
2c42be65 | 632 | REQUIRE (read_byte (&buf, end, &cie.per_encoding)); |
65765700 JJ |
633 | per_width = get_DW_EH_PE_width (cie.per_encoding, |
634 | ptr_size); | |
acfe5567 | 635 | REQUIRE (per_width); |
65765700 | 636 | if ((cie.per_encoding & 0xf0) == DW_EH_PE_aligned) |
2c42be65 RS |
637 | { |
638 | length = -(buf - ehbuf) & (per_width - 1); | |
639 | REQUIRE (skip_bytes (&buf, end, length)); | |
640 | } | |
65765700 | 641 | ENSURE_NO_RELOCS (buf); |
65765700 JJ |
642 | /* Ensure we have a reloc here, against |
643 | a global symbol. */ | |
99eb2ac8 | 644 | if (GET_RELOC (buf) != NULL) |
65765700 JJ |
645 | { |
646 | unsigned long r_symndx; | |
647 | ||
648 | #ifdef BFD64 | |
649 | if (ptr_size == 8) | |
650 | r_symndx = ELF64_R_SYM (cookie->rel->r_info); | |
651 | else | |
652 | #endif | |
653 | r_symndx = ELF32_R_SYM (cookie->rel->r_info); | |
654 | if (r_symndx >= cookie->locsymcount) | |
655 | { | |
656 | struct elf_link_hash_entry *h; | |
657 | ||
658 | r_symndx -= cookie->extsymoff; | |
659 | h = cookie->sym_hashes[r_symndx]; | |
660 | ||
661 | while (h->root.type == bfd_link_hash_indirect | |
662 | || h->root.type == bfd_link_hash_warning) | |
663 | h = (struct elf_link_hash_entry *) | |
664 | h->root.u.i.link; | |
665 | ||
666 | cie.personality = h; | |
667 | } | |
f4a6705c RS |
668 | /* Cope with MIPS-style composite relocations. */ |
669 | do | |
670 | cookie->rel++; | |
671 | while (GET_RELOC (buf) != NULL); | |
65765700 | 672 | } |
2c42be65 | 673 | REQUIRE (skip_bytes (&buf, end, per_width)); |
65765700 JJ |
674 | } |
675 | break; | |
676 | default: | |
677 | /* Unrecognized augmentation. Better bail out. */ | |
678 | goto free_no_table; | |
679 | } | |
680 | } | |
681 | ||
682 | /* For shared libraries, try to get rid of as many RELATIVE relocs | |
0bb2d96a | 683 | as possible. */ |
3472e2e9 | 684 | if (info->shared |
ec3391e7 AO |
685 | && (get_elf_backend_data (abfd) |
686 | ->elf_backend_can_make_relative_eh_frame | |
353057a5 RS |
687 | (abfd, info, sec))) |
688 | { | |
689 | if ((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr) | |
690 | cie.make_relative = 1; | |
691 | /* If the CIE doesn't already have an 'R' entry, it's fairly | |
692 | easy to add one, provided that there's no aligned data | |
693 | after the augmentation string. */ | |
694 | else if (cie.fde_encoding == DW_EH_PE_omit | |
695 | && (cie.per_encoding & 0xf0) != DW_EH_PE_aligned) | |
696 | { | |
697 | if (*cie.augmentation == 0) | |
698 | this_inf->add_augmentation_size = 1; | |
699 | this_inf->add_fde_encoding = 1; | |
700 | cie.make_relative = 1; | |
701 | } | |
702 | } | |
65765700 | 703 | |
0bb2d96a | 704 | if (info->shared |
ec3391e7 AO |
705 | && (get_elf_backend_data (abfd) |
706 | ->elf_backend_can_make_lsda_relative_eh_frame | |
707 | (abfd, info, sec)) | |
9e2a4898 JJ |
708 | && (cie.lsda_encoding & 0xf0) == DW_EH_PE_absptr) |
709 | cie.make_lsda_relative = 1; | |
710 | ||
65765700 JJ |
711 | /* If FDE encoding was not specified, it defaults to |
712 | DW_EH_absptr. */ | |
713 | if (cie.fde_encoding == DW_EH_PE_omit) | |
714 | cie.fde_encoding = DW_EH_PE_absptr; | |
715 | ||
dcf507a6 | 716 | initial_insn_length = end - buf; |
65765700 JJ |
717 | if (initial_insn_length <= 50) |
718 | { | |
719 | cie.initial_insn_length = initial_insn_length; | |
720 | memcpy (cie.initial_instructions, buf, initial_insn_length); | |
721 | } | |
dcf507a6 | 722 | insns = buf; |
65765700 JJ |
723 | buf += initial_insn_length; |
724 | ENSURE_NO_RELOCS (buf); | |
725 | last_cie = last_fde; | |
726 | } | |
727 | else | |
728 | { | |
729 | /* Ensure this FDE uses the last CIE encountered. */ | |
acfe5567 RS |
730 | REQUIRE (last_cie); |
731 | REQUIRE (hdr.id == (unsigned int) (buf - 4 - last_cie)); | |
65765700 JJ |
732 | |
733 | ENSURE_NO_RELOCS (buf); | |
acfe5567 | 734 | REQUIRE (GET_RELOC (buf)); |
fda3ecf2 | 735 | |
65765700 | 736 | if ((*reloc_symbol_deleted_p) (buf - ehbuf, cookie)) |
353057a5 RS |
737 | /* This is a FDE against a discarded section. It should |
738 | be deleted. */ | |
739 | this_inf->removed = 1; | |
65765700 JJ |
740 | else |
741 | { | |
0bb2d96a | 742 | if (info->shared |
af40ce3c JJ |
743 | && (((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr |
744 | && cie.make_relative == 0) | |
745 | || (cie.fde_encoding & 0xf0) == DW_EH_PE_aligned)) | |
0bb2d96a | 746 | { |
73722af0 | 747 | /* If a shared library uses absolute pointers |
0bb2d96a JJ |
748 | which we cannot turn into PC relative, |
749 | don't create the binary search table, | |
750 | since it is affected by runtime relocations. */ | |
b34976b6 | 751 | hdr_info->table = FALSE; |
0bb2d96a | 752 | } |
65765700 JJ |
753 | cie_usage_count++; |
754 | hdr_info->fde_count++; | |
755 | } | |
2c42be65 RS |
756 | /* Skip the initial location and address range. */ |
757 | start = buf; | |
758 | length = get_DW_EH_PE_width (cie.fde_encoding, ptr_size); | |
759 | REQUIRE (skip_bytes (&buf, end, 2 * length)); | |
760 | ||
761 | /* Skip the augmentation size, if present. */ | |
762 | if (cie.augmentation[0] == 'z') | |
dcf507a6 RS |
763 | REQUIRE (read_uleb128 (&buf, end, &length)); |
764 | else | |
765 | length = 0; | |
2c42be65 RS |
766 | |
767 | /* Of the supported augmentation characters above, only 'L' | |
768 | adds augmentation data to the FDE. This code would need to | |
769 | be adjusted if any future augmentations do the same thing. */ | |
9e2a4898 | 770 | if (cie.lsda_encoding != DW_EH_PE_omit) |
dcf507a6 RS |
771 | { |
772 | this_inf->lsda_offset = buf - start; | |
773 | /* If there's no 'z' augmentation, we don't know where the | |
774 | CFA insns begin. Assume no padding. */ | |
775 | if (cie.augmentation[0] != 'z') | |
776 | length = end - buf; | |
777 | } | |
778 | ||
779 | /* Skip over the augmentation data. */ | |
780 | REQUIRE (skip_bytes (&buf, end, length)); | |
781 | insns = buf; | |
9e2a4898 | 782 | |
65765700 JJ |
783 | buf = last_fde + 4 + hdr.length; |
784 | SKIP_RELOCS (buf); | |
785 | } | |
786 | ||
dcf507a6 RS |
787 | /* Try to interpret the CFA instructions and find the first |
788 | padding nop. Shrink this_inf's size so that it doesn't | |
ac685e6a | 789 | include the padding. */ |
dcf507a6 | 790 | length = get_DW_EH_PE_width (cie.fde_encoding, ptr_size); |
ac685e6a JJ |
791 | set_loc_count = 0; |
792 | insns_end = skip_non_nops (insns, end, length, &set_loc_count); | |
793 | /* If we don't understand the CFA instructions, we can't know | |
794 | what needs to be adjusted there. */ | |
795 | if (insns_end == NULL | |
796 | /* For the time being we don't support DW_CFA_set_loc in | |
797 | CIE instructions. */ | |
798 | || (set_loc_count && this_inf->cie)) | |
799 | goto free_no_table; | |
800 | this_inf->size -= end - insns_end; | |
801 | if (set_loc_count | |
802 | && ((cie.fde_encoding & 0xf0) == DW_EH_PE_pcrel | |
803 | || cie.make_relative)) | |
804 | { | |
805 | unsigned int cnt; | |
806 | bfd_byte *p; | |
807 | ||
808 | this_inf->set_loc = bfd_malloc ((set_loc_count + 1) | |
809 | * sizeof (unsigned int)); | |
810 | REQUIRE (this_inf->set_loc); | |
811 | this_inf->set_loc[0] = set_loc_count; | |
812 | p = insns; | |
813 | cnt = 0; | |
814 | while (p < end) | |
815 | { | |
816 | if (*p == DW_CFA_set_loc) | |
817 | this_inf->set_loc[++cnt] = p + 1 - start; | |
818 | REQUIRE (skip_cfa_op (&p, end, length)); | |
819 | } | |
820 | } | |
dcf507a6 | 821 | |
fda3ecf2 AM |
822 | this_inf->fde_encoding = cie.fde_encoding; |
823 | this_inf->lsda_encoding = cie.lsda_encoding; | |
65765700 JJ |
824 | sec_info->count++; |
825 | } | |
826 | ||
827 | elf_section_data (sec)->sec_info = sec_info; | |
68bfbfcc | 828 | sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME; |
65765700 JJ |
829 | |
830 | /* Ok, now we can assign new offsets. */ | |
831 | offset = 0; | |
fda3ecf2 AM |
832 | last_cie_inf = hdr_info->last_cie_inf; |
833 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) | |
834 | if (!ent->removed) | |
835 | { | |
fda3ecf2 AM |
836 | if (ent->cie) |
837 | last_cie_inf = ent; | |
838 | else | |
839 | ent->cie_inf = last_cie_inf; | |
353057a5 RS |
840 | ent->new_offset = offset; |
841 | offset += size_of_output_cie_fde (ent, ptr_size); | |
fda3ecf2 AM |
842 | } |
843 | hdr_info->last_cie_inf = last_cie_inf; | |
65765700 | 844 | |
353057a5 | 845 | /* Resize the sec as needed. */ |
eea6121a | 846 | sec->rawsize = sec->size; |
353057a5 | 847 | sec->size = offset; |
eea6121a | 848 | if (sec->size == 0) |
65765700 JJ |
849 | sec->flags |= SEC_EXCLUDE; |
850 | ||
68f69152 | 851 | free (ehbuf); |
353057a5 | 852 | return offset != sec->rawsize; |
65765700 JJ |
853 | |
854 | free_no_table: | |
68f69152 JJ |
855 | if (ehbuf) |
856 | free (ehbuf); | |
65765700 JJ |
857 | if (sec_info) |
858 | free (sec_info); | |
b34976b6 | 859 | hdr_info->table = FALSE; |
65765700 | 860 | hdr_info->last_cie.hdr.length = 0; |
b34976b6 | 861 | return FALSE; |
acfe5567 RS |
862 | |
863 | #undef REQUIRE | |
65765700 JJ |
864 | } |
865 | ||
866 | /* This function is called for .eh_frame_hdr section after | |
867 | _bfd_elf_discard_section_eh_frame has been called on all .eh_frame | |
868 | input sections. It finalizes the size of .eh_frame_hdr section. */ | |
869 | ||
b34976b6 | 870 | bfd_boolean |
c39a58e6 | 871 | _bfd_elf_discard_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
65765700 | 872 | { |
126495ed | 873 | struct elf_link_hash_table *htab; |
65765700 | 874 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 875 | asection *sec; |
65765700 | 876 | |
126495ed AM |
877 | htab = elf_hash_table (info); |
878 | hdr_info = &htab->eh_info; | |
879 | sec = hdr_info->hdr_sec; | |
880 | if (sec == NULL) | |
b34976b6 | 881 | return FALSE; |
126495ed | 882 | |
eea6121a | 883 | sec->size = EH_FRAME_HDR_SIZE; |
65765700 | 884 | if (hdr_info->table) |
eea6121a | 885 | sec->size += 4 + hdr_info->fde_count * 8; |
65765700 | 886 | |
126495ed | 887 | elf_tdata (abfd)->eh_frame_hdr = sec; |
b34976b6 | 888 | return TRUE; |
65765700 JJ |
889 | } |
890 | ||
68f69152 JJ |
891 | /* This function is called from size_dynamic_sections. |
892 | It needs to decide whether .eh_frame_hdr should be output or not, | |
8423293d AM |
893 | because when the dynamic symbol table has been sized it is too late |
894 | to strip sections. */ | |
68f69152 | 895 | |
b34976b6 | 896 | bfd_boolean |
c39a58e6 | 897 | _bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info) |
68f69152 | 898 | { |
126495ed | 899 | asection *o; |
68f69152 | 900 | bfd *abfd; |
126495ed | 901 | struct elf_link_hash_table *htab; |
68f69152 JJ |
902 | struct eh_frame_hdr_info *hdr_info; |
903 | ||
126495ed AM |
904 | htab = elf_hash_table (info); |
905 | hdr_info = &htab->eh_info; | |
906 | if (hdr_info->hdr_sec == NULL) | |
b34976b6 | 907 | return TRUE; |
68f69152 | 908 | |
126495ed AM |
909 | if (bfd_is_abs_section (hdr_info->hdr_sec->output_section)) |
910 | { | |
911 | hdr_info->hdr_sec = NULL; | |
b34976b6 | 912 | return TRUE; |
126495ed | 913 | } |
68f69152 JJ |
914 | |
915 | abfd = NULL; | |
916 | if (info->eh_frame_hdr) | |
917 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) | |
918 | { | |
919 | /* Count only sections which have at least a single CIE or FDE. | |
920 | There cannot be any CIE or FDE <= 8 bytes. */ | |
921 | o = bfd_get_section_by_name (abfd, ".eh_frame"); | |
eea6121a | 922 | if (o && o->size > 8 && !bfd_is_abs_section (o->output_section)) |
68f69152 JJ |
923 | break; |
924 | } | |
925 | ||
926 | if (abfd == NULL) | |
927 | { | |
8423293d | 928 | hdr_info->hdr_sec->flags |= SEC_EXCLUDE; |
126495ed | 929 | hdr_info->hdr_sec = NULL; |
b34976b6 | 930 | return TRUE; |
68f69152 | 931 | } |
126495ed | 932 | |
b34976b6 AM |
933 | hdr_info->table = TRUE; |
934 | return TRUE; | |
68f69152 JJ |
935 | } |
936 | ||
65765700 JJ |
937 | /* Adjust an address in the .eh_frame section. Given OFFSET within |
938 | SEC, this returns the new offset in the adjusted .eh_frame section, | |
939 | or -1 if the address refers to a CIE/FDE which has been removed | |
940 | or to offset with dynamic relocation which is no longer needed. */ | |
941 | ||
942 | bfd_vma | |
c39a58e6 | 943 | _bfd_elf_eh_frame_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, |
92e4ec35 | 944 | struct bfd_link_info *info, |
c39a58e6 AM |
945 | asection *sec, |
946 | bfd_vma offset) | |
65765700 JJ |
947 | { |
948 | struct eh_frame_sec_info *sec_info; | |
92e4ec35 AM |
949 | struct elf_link_hash_table *htab; |
950 | struct eh_frame_hdr_info *hdr_info; | |
65765700 JJ |
951 | unsigned int lo, hi, mid; |
952 | ||
68bfbfcc | 953 | if (sec->sec_info_type != ELF_INFO_TYPE_EH_FRAME) |
65765700 | 954 | return offset; |
c39a58e6 | 955 | sec_info = elf_section_data (sec)->sec_info; |
65765700 | 956 | |
eea6121a AM |
957 | if (offset >= sec->rawsize) |
958 | return offset - sec->rawsize + sec->size; | |
65765700 | 959 | |
92e4ec35 AM |
960 | htab = elf_hash_table (info); |
961 | hdr_info = &htab->eh_info; | |
962 | if (hdr_info->offsets_adjusted) | |
963 | offset += sec->output_offset; | |
964 | ||
65765700 JJ |
965 | lo = 0; |
966 | hi = sec_info->count; | |
967 | mid = 0; | |
968 | while (lo < hi) | |
969 | { | |
970 | mid = (lo + hi) / 2; | |
971 | if (offset < sec_info->entry[mid].offset) | |
972 | hi = mid; | |
973 | else if (offset | |
974 | >= sec_info->entry[mid].offset + sec_info->entry[mid].size) | |
975 | lo = mid + 1; | |
976 | else | |
977 | break; | |
978 | } | |
979 | ||
980 | BFD_ASSERT (lo < hi); | |
981 | ||
982 | /* FDE or CIE was removed. */ | |
983 | if (sec_info->entry[mid].removed) | |
984 | return (bfd_vma) -1; | |
985 | ||
986 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time | |
987 | relocation against FDE's initial_location field. */ | |
fda3ecf2 AM |
988 | if (!sec_info->entry[mid].cie |
989 | && sec_info->entry[mid].cie_inf->make_relative | |
353057a5 RS |
990 | && offset == sec_info->entry[mid].offset + 8) |
991 | return (bfd_vma) -2; | |
65765700 | 992 | |
9e2a4898 JJ |
993 | /* If converting LSDA pointers to DW_EH_PE_pcrel, there will be no need |
994 | for run-time relocation against LSDA field. */ | |
fda3ecf2 AM |
995 | if (!sec_info->entry[mid].cie |
996 | && sec_info->entry[mid].cie_inf->make_lsda_relative | |
126495ed | 997 | && (offset == (sec_info->entry[mid].offset + 8 |
92e4ec35 AM |
998 | + sec_info->entry[mid].lsda_offset)) |
999 | && (sec_info->entry[mid].cie_inf->need_lsda_relative | |
1000 | || !hdr_info->offsets_adjusted)) | |
8935b81f | 1001 | { |
fda3ecf2 | 1002 | sec_info->entry[mid].cie_inf->need_lsda_relative = 1; |
8935b81f AM |
1003 | return (bfd_vma) -2; |
1004 | } | |
9e2a4898 | 1005 | |
ac685e6a JJ |
1006 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1007 | relocation against DW_CFA_set_loc's arguments. */ | |
1008 | if (sec_info->entry[mid].set_loc | |
1009 | && (sec_info->entry[mid].cie | |
1010 | ? sec_info->entry[mid].make_relative | |
1011 | : sec_info->entry[mid].cie_inf->make_relative) | |
1012 | && (offset >= sec_info->entry[mid].offset + 8 | |
1013 | + sec_info->entry[mid].set_loc[1])) | |
1014 | { | |
1015 | unsigned int cnt; | |
1016 | ||
1017 | for (cnt = 1; cnt <= sec_info->entry[mid].set_loc[0]; cnt++) | |
1018 | if (offset == sec_info->entry[mid].offset + 8 | |
1019 | + sec_info->entry[mid].set_loc[cnt]) | |
1020 | return (bfd_vma) -2; | |
1021 | } | |
1022 | ||
92e4ec35 AM |
1023 | if (hdr_info->offsets_adjusted) |
1024 | offset -= sec->output_offset; | |
353057a5 | 1025 | /* Any new augmentation bytes go before the first relocation. */ |
c68836a9 | 1026 | return (offset + sec_info->entry[mid].new_offset |
353057a5 RS |
1027 | - sec_info->entry[mid].offset |
1028 | + extra_augmentation_string_bytes (sec_info->entry + mid) | |
1029 | + extra_augmentation_data_bytes (sec_info->entry + mid)); | |
65765700 JJ |
1030 | } |
1031 | ||
1032 | /* Write out .eh_frame section. This is called with the relocated | |
1033 | contents. */ | |
1034 | ||
b34976b6 | 1035 | bfd_boolean |
c39a58e6 AM |
1036 | _bfd_elf_write_section_eh_frame (bfd *abfd, |
1037 | struct bfd_link_info *info, | |
1038 | asection *sec, | |
1039 | bfd_byte *contents) | |
65765700 JJ |
1040 | { |
1041 | struct eh_frame_sec_info *sec_info; | |
126495ed | 1042 | struct elf_link_hash_table *htab; |
65765700 | 1043 | struct eh_frame_hdr_info *hdr_info; |
65765700 | 1044 | unsigned int ptr_size; |
fda3ecf2 | 1045 | struct eh_cie_fde *ent; |
65765700 | 1046 | |
68bfbfcc | 1047 | if (sec->sec_info_type != ELF_INFO_TYPE_EH_FRAME) |
c39a58e6 | 1048 | return bfd_set_section_contents (abfd, sec->output_section, contents, |
eea6121a | 1049 | sec->output_offset, sec->size); |
8c946ed5 RS |
1050 | |
1051 | ptr_size = (get_elf_backend_data (abfd) | |
1052 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
1053 | BFD_ASSERT (ptr_size != 0); | |
1054 | ||
c39a58e6 | 1055 | sec_info = elf_section_data (sec)->sec_info; |
126495ed AM |
1056 | htab = elf_hash_table (info); |
1057 | hdr_info = &htab->eh_info; | |
3472e2e9 AM |
1058 | |
1059 | /* First convert all offsets to output section offsets, so that a | |
1060 | CIE offset is valid if the CIE is used by a FDE from some other | |
1061 | section. This can happen when duplicate CIEs are deleted in | |
1062 | _bfd_elf_discard_section_eh_frame. We do all sections here because | |
1063 | this function might not be called on sections in the same order as | |
1064 | _bfd_elf_discard_section_eh_frame. */ | |
1065 | if (!hdr_info->offsets_adjusted) | |
1066 | { | |
1067 | bfd *ibfd; | |
1068 | asection *eh; | |
1069 | struct eh_frame_sec_info *eh_inf; | |
1070 | ||
1071 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) | |
1072 | { | |
1073 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
1074 | || (ibfd->flags & DYNAMIC) != 0) | |
1075 | continue; | |
1076 | ||
1077 | eh = bfd_get_section_by_name (ibfd, ".eh_frame"); | |
1078 | if (eh == NULL || eh->sec_info_type != ELF_INFO_TYPE_EH_FRAME) | |
1079 | continue; | |
1080 | ||
1081 | eh_inf = elf_section_data (eh)->sec_info; | |
1082 | for (ent = eh_inf->entry; ent < eh_inf->entry + eh_inf->count; ++ent) | |
1083 | { | |
1084 | ent->offset += eh->output_offset; | |
1085 | ent->new_offset += eh->output_offset; | |
1086 | } | |
1087 | } | |
1088 | hdr_info->offsets_adjusted = TRUE; | |
1089 | } | |
1090 | ||
126495ed AM |
1091 | if (hdr_info->table && hdr_info->array == NULL) |
1092 | hdr_info->array | |
1093 | = bfd_malloc (hdr_info->fde_count * sizeof(*hdr_info->array)); | |
1094 | if (hdr_info->array == NULL) | |
1095 | hdr_info = NULL; | |
65765700 | 1096 | |
353057a5 RS |
1097 | /* The new offsets can be bigger or smaller than the original offsets. |
1098 | We therefore need to make two passes over the section: one backward | |
1099 | pass to move entries up and one forward pass to move entries down. | |
1100 | The two passes won't interfere with each other because entries are | |
1101 | not reordered */ | |
1102 | for (ent = sec_info->entry + sec_info->count; ent-- != sec_info->entry;) | |
1103 | if (!ent->removed && ent->new_offset > ent->offset) | |
1104 | memmove (contents + ent->new_offset - sec->output_offset, | |
1105 | contents + ent->offset - sec->output_offset, ent->size); | |
1106 | ||
1107 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) | |
1108 | if (!ent->removed && ent->new_offset < ent->offset) | |
1109 | memmove (contents + ent->new_offset - sec->output_offset, | |
1110 | contents + ent->offset - sec->output_offset, ent->size); | |
1111 | ||
fda3ecf2 | 1112 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
65765700 | 1113 | { |
353057a5 RS |
1114 | unsigned char *buf, *end; |
1115 | unsigned int new_size; | |
1116 | ||
fda3ecf2 AM |
1117 | if (ent->removed) |
1118 | continue; | |
1119 | ||
353057a5 RS |
1120 | if (ent->size == 4) |
1121 | { | |
1122 | /* Any terminating FDE must be at the end of the section. */ | |
1123 | BFD_ASSERT (ent == sec_info->entry + sec_info->count - 1); | |
1124 | continue; | |
1125 | } | |
1126 | ||
1127 | buf = contents + ent->new_offset - sec->output_offset; | |
1128 | end = buf + ent->size; | |
1129 | new_size = size_of_output_cie_fde (ent, ptr_size); | |
1130 | ||
a34a056a L |
1131 | /* Update the size. It may be shrinked. */ |
1132 | bfd_put_32 (abfd, new_size - 4, buf); | |
1133 | ||
1134 | /* Filling the extra bytes with DW_CFA_nops. */ | |
353057a5 | 1135 | if (new_size != ent->size) |
a34a056a | 1136 | memset (end, 0, new_size - ent->size); |
353057a5 | 1137 | |
fda3ecf2 | 1138 | if (ent->cie) |
65765700 JJ |
1139 | { |
1140 | /* CIE */ | |
353057a5 | 1141 | if (ent->make_relative |
fda3ecf2 AM |
1142 | || ent->need_lsda_relative |
1143 | || ent->per_encoding_relative) | |
65765700 | 1144 | { |
f075ee0c | 1145 | char *aug; |
353057a5 | 1146 | unsigned int action, extra_string, extra_data; |
2c42be65 | 1147 | unsigned int per_width, per_encoding; |
65765700 | 1148 | |
9e2a4898 | 1149 | /* Need to find 'R' or 'L' augmentation's argument and modify |
65765700 | 1150 | DW_EH_PE_* value. */ |
353057a5 | 1151 | action = ((ent->make_relative ? 1 : 0) |
fda3ecf2 AM |
1152 | | (ent->need_lsda_relative ? 2 : 0) |
1153 | | (ent->per_encoding_relative ? 4 : 0)); | |
353057a5 RS |
1154 | extra_string = extra_augmentation_string_bytes (ent); |
1155 | extra_data = extra_augmentation_data_bytes (ent); | |
1156 | ||
65765700 JJ |
1157 | /* Skip length, id and version. */ |
1158 | buf += 9; | |
f075ee0c AM |
1159 | aug = (char *) buf; |
1160 | buf += strlen (aug) + 1; | |
2c42be65 RS |
1161 | skip_leb128 (&buf, end); |
1162 | skip_leb128 (&buf, end); | |
1163 | skip_leb128 (&buf, end); | |
65765700 JJ |
1164 | if (*aug == 'z') |
1165 | { | |
353057a5 RS |
1166 | /* The uleb128 will always be a single byte for the kind |
1167 | of augmentation strings that we're prepared to handle. */ | |
1168 | *buf++ += extra_data; | |
65765700 JJ |
1169 | aug++; |
1170 | } | |
1171 | ||
353057a5 RS |
1172 | /* Make room for the new augmentation string and data bytes. */ |
1173 | memmove (buf + extra_string + extra_data, buf, end - buf); | |
f075ee0c | 1174 | memmove (aug + extra_string, aug, buf - (bfd_byte *) aug); |
353057a5 | 1175 | buf += extra_string; |
2c42be65 | 1176 | end += extra_string + extra_data; |
353057a5 RS |
1177 | |
1178 | if (ent->add_augmentation_size) | |
1179 | { | |
1180 | *aug++ = 'z'; | |
1181 | *buf++ = extra_data - 1; | |
1182 | } | |
1183 | if (ent->add_fde_encoding) | |
1184 | { | |
1185 | BFD_ASSERT (action & 1); | |
1186 | *aug++ = 'R'; | |
1187 | *buf++ = DW_EH_PE_pcrel; | |
1188 | action &= ~1; | |
1189 | } | |
1190 | ||
9e2a4898 | 1191 | while (action) |
65765700 JJ |
1192 | switch (*aug++) |
1193 | { | |
1194 | case 'L': | |
9e2a4898 JJ |
1195 | if (action & 2) |
1196 | { | |
fda3ecf2 | 1197 | BFD_ASSERT (*buf == ent->lsda_encoding); |
9e2a4898 JJ |
1198 | *buf |= DW_EH_PE_pcrel; |
1199 | action &= ~2; | |
1200 | } | |
65765700 JJ |
1201 | buf++; |
1202 | break; | |
1203 | case 'P': | |
1204 | per_encoding = *buf++; | |
3472e2e9 | 1205 | per_width = get_DW_EH_PE_width (per_encoding, ptr_size); |
65765700 | 1206 | BFD_ASSERT (per_width != 0); |
09ae86c2 | 1207 | BFD_ASSERT (((per_encoding & 0x70) == DW_EH_PE_pcrel) |
fda3ecf2 | 1208 | == ent->per_encoding_relative); |
65765700 JJ |
1209 | if ((per_encoding & 0xf0) == DW_EH_PE_aligned) |
1210 | buf = (contents | |
1211 | + ((buf - contents + per_width - 1) | |
1212 | & ~((bfd_size_type) per_width - 1))); | |
09ae86c2 JJ |
1213 | if (action & 4) |
1214 | { | |
fda3ecf2 AM |
1215 | bfd_vma val; |
1216 | ||
1217 | val = read_value (abfd, buf, per_width, | |
1218 | get_DW_EH_PE_signed (per_encoding)); | |
1219 | val += ent->offset - ent->new_offset; | |
353057a5 | 1220 | val -= extra_string + extra_data; |
fda3ecf2 | 1221 | write_value (abfd, buf, val, per_width); |
09ae86c2 JJ |
1222 | action &= ~4; |
1223 | } | |
65765700 JJ |
1224 | buf += per_width; |
1225 | break; | |
9e2a4898 JJ |
1226 | case 'R': |
1227 | if (action & 1) | |
1228 | { | |
fda3ecf2 | 1229 | BFD_ASSERT (*buf == ent->fde_encoding); |
9e2a4898 JJ |
1230 | *buf |= DW_EH_PE_pcrel; |
1231 | action &= ~1; | |
1232 | } | |
1233 | buf++; | |
1234 | break; | |
63752a75 JJ |
1235 | case 'S': |
1236 | break; | |
65765700 JJ |
1237 | default: |
1238 | BFD_FAIL (); | |
1239 | } | |
65765700 JJ |
1240 | } |
1241 | } | |
353057a5 | 1242 | else |
65765700 JJ |
1243 | { |
1244 | /* FDE */ | |
fda3ecf2 | 1245 | bfd_vma value, address; |
9e2a4898 | 1246 | unsigned int width; |
ac685e6a | 1247 | bfd_byte *start; |
65765700 | 1248 | |
b34976b6 | 1249 | /* Skip length. */ |
65765700 | 1250 | buf += 4; |
fda3ecf2 AM |
1251 | value = ent->new_offset + 4 - ent->cie_inf->new_offset; |
1252 | bfd_put_32 (abfd, value, buf); | |
65765700 | 1253 | buf += 4; |
fda3ecf2 AM |
1254 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); |
1255 | value = read_value (abfd, buf, width, | |
1256 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
1257 | address = value; | |
9e2a4898 | 1258 | if (value) |
65765700 | 1259 | { |
fda3ecf2 | 1260 | switch (ent->fde_encoding & 0xf0) |
9e2a4898 JJ |
1261 | { |
1262 | case DW_EH_PE_indirect: | |
1263 | case DW_EH_PE_textrel: | |
1264 | BFD_ASSERT (hdr_info == NULL); | |
1265 | break; | |
1266 | case DW_EH_PE_datarel: | |
1267 | { | |
1268 | asection *got = bfd_get_section_by_name (abfd, ".got"); | |
1269 | ||
1270 | BFD_ASSERT (got != NULL); | |
1271 | address += got->vma; | |
1272 | } | |
1273 | break; | |
1274 | case DW_EH_PE_pcrel: | |
fda3ecf2 AM |
1275 | value += ent->offset - ent->new_offset; |
1276 | address += sec->output_section->vma + ent->offset + 8; | |
9e2a4898 JJ |
1277 | break; |
1278 | } | |
353057a5 | 1279 | if (ent->cie_inf->make_relative) |
fda3ecf2 | 1280 | value -= sec->output_section->vma + ent->new_offset + 8; |
9e2a4898 | 1281 | write_value (abfd, buf, value, width); |
65765700 JJ |
1282 | } |
1283 | ||
ac685e6a JJ |
1284 | start = buf; |
1285 | ||
65765700 JJ |
1286 | if (hdr_info) |
1287 | { | |
1288 | hdr_info->array[hdr_info->array_count].initial_loc = address; | |
1289 | hdr_info->array[hdr_info->array_count++].fde | |
fda3ecf2 | 1290 | = sec->output_section->vma + ent->new_offset; |
65765700 | 1291 | } |
9e2a4898 | 1292 | |
fda3ecf2 AM |
1293 | if ((ent->lsda_encoding & 0xf0) == DW_EH_PE_pcrel |
1294 | || ent->cie_inf->need_lsda_relative) | |
9e2a4898 | 1295 | { |
fda3ecf2 AM |
1296 | buf += ent->lsda_offset; |
1297 | width = get_DW_EH_PE_width (ent->lsda_encoding, ptr_size); | |
84f97cb6 | 1298 | value = read_value (abfd, buf, width, |
fda3ecf2 | 1299 | get_DW_EH_PE_signed (ent->lsda_encoding)); |
9e2a4898 JJ |
1300 | if (value) |
1301 | { | |
fda3ecf2 AM |
1302 | if ((ent->lsda_encoding & 0xf0) == DW_EH_PE_pcrel) |
1303 | value += ent->offset - ent->new_offset; | |
1304 | else if (ent->cie_inf->need_lsda_relative) | |
1305 | value -= (sec->output_section->vma + ent->new_offset + 8 | |
1306 | + ent->lsda_offset); | |
9e2a4898 JJ |
1307 | write_value (abfd, buf, value, width); |
1308 | } | |
1309 | } | |
353057a5 RS |
1310 | else if (ent->cie_inf->add_augmentation_size) |
1311 | { | |
1312 | /* Skip the PC and length and insert a zero byte for the | |
1313 | augmentation size. */ | |
1314 | buf += width * 2; | |
1315 | memmove (buf + 1, buf, end - buf); | |
1316 | *buf = 0; | |
1317 | } | |
ac685e6a JJ |
1318 | |
1319 | if (ent->set_loc) | |
1320 | { | |
1321 | /* Adjust DW_CFA_set_loc. */ | |
1322 | unsigned int cnt, width; | |
1323 | bfd_vma new_offset; | |
1324 | ||
1325 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1326 | new_offset = ent->new_offset + 8 | |
1327 | + extra_augmentation_string_bytes (ent) | |
1328 | + extra_augmentation_data_bytes (ent); | |
1329 | ||
1330 | for (cnt = 1; cnt <= ent->set_loc[0]; cnt++) | |
1331 | { | |
1332 | bfd_vma value; | |
1333 | buf = start + ent->set_loc[cnt]; | |
1334 | ||
1335 | value = read_value (abfd, buf, width, | |
1336 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
1337 | if (!value) | |
1338 | continue; | |
1339 | ||
1340 | if ((ent->fde_encoding & 0xf0) == DW_EH_PE_pcrel) | |
1341 | value += ent->offset + 8 - new_offset; | |
1342 | if (ent->cie_inf->make_relative) | |
1343 | value -= sec->output_section->vma + new_offset | |
1344 | + ent->set_loc[cnt]; | |
1345 | write_value (abfd, buf, value, width); | |
1346 | } | |
1347 | } | |
65765700 | 1348 | } |
65765700 JJ |
1349 | } |
1350 | ||
a34a056a L |
1351 | /* We don't align the section to its section alignment since the |
1352 | runtime library only expects all CIE/FDE records aligned at | |
1353 | the pointer size. _bfd_elf_discard_section_eh_frame should | |
1354 | have padded CIE/FDE records to multiple of pointer size with | |
1355 | size_of_output_cie_fde. */ | |
1356 | if ((sec->size % ptr_size) != 0) | |
1357 | abort (); | |
a5eb27e6 | 1358 | |
65765700 | 1359 | return bfd_set_section_contents (abfd, sec->output_section, |
3472e2e9 AM |
1360 | contents, (file_ptr) sec->output_offset, |
1361 | sec->size); | |
65765700 JJ |
1362 | } |
1363 | ||
1364 | /* Helper function used to sort .eh_frame_hdr search table by increasing | |
1365 | VMA of FDE initial location. */ | |
1366 | ||
1367 | static int | |
c39a58e6 | 1368 | vma_compare (const void *a, const void *b) |
65765700 | 1369 | { |
c39a58e6 AM |
1370 | const struct eh_frame_array_ent *p = a; |
1371 | const struct eh_frame_array_ent *q = b; | |
65765700 JJ |
1372 | if (p->initial_loc > q->initial_loc) |
1373 | return 1; | |
1374 | if (p->initial_loc < q->initial_loc) | |
1375 | return -1; | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | /* Write out .eh_frame_hdr section. This must be called after | |
1380 | _bfd_elf_write_section_eh_frame has been called on all input | |
1381 | .eh_frame sections. | |
1382 | .eh_frame_hdr format: | |
1383 | ubyte version (currently 1) | |
1384 | ubyte eh_frame_ptr_enc (DW_EH_PE_* encoding of pointer to start of | |
1385 | .eh_frame section) | |
1386 | ubyte fde_count_enc (DW_EH_PE_* encoding of total FDE count | |
1387 | number (or DW_EH_PE_omit if there is no | |
1388 | binary search table computed)) | |
1389 | ubyte table_enc (DW_EH_PE_* encoding of binary search table, | |
1390 | or DW_EH_PE_omit if not present. | |
1391 | DW_EH_PE_datarel is using address of | |
1392 | .eh_frame_hdr section start as base) | |
1393 | [encoded] eh_frame_ptr (pointer to start of .eh_frame section) | |
1394 | optionally followed by: | |
1395 | [encoded] fde_count (total number of FDEs in .eh_frame section) | |
1396 | fde_count x [encoded] initial_loc, fde | |
1397 | (array of encoded pairs containing | |
1398 | FDE initial_location field and FDE address, | |
5ed6aba4 | 1399 | sorted by increasing initial_loc). */ |
65765700 | 1400 | |
b34976b6 | 1401 | bfd_boolean |
c39a58e6 | 1402 | _bfd_elf_write_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
65765700 | 1403 | { |
126495ed | 1404 | struct elf_link_hash_table *htab; |
65765700 | 1405 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 1406 | asection *sec; |
65765700 JJ |
1407 | bfd_byte *contents; |
1408 | asection *eh_frame_sec; | |
1409 | bfd_size_type size; | |
5ed6aba4 | 1410 | bfd_boolean retval; |
ec3391e7 | 1411 | bfd_vma encoded_eh_frame; |
65765700 | 1412 | |
126495ed AM |
1413 | htab = elf_hash_table (info); |
1414 | hdr_info = &htab->eh_info; | |
1415 | sec = hdr_info->hdr_sec; | |
1416 | if (sec == NULL) | |
b34976b6 | 1417 | return TRUE; |
57a72197 | 1418 | |
65765700 JJ |
1419 | size = EH_FRAME_HDR_SIZE; |
1420 | if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) | |
1421 | size += 4 + hdr_info->fde_count * 8; | |
1422 | contents = bfd_malloc (size); | |
1423 | if (contents == NULL) | |
b34976b6 | 1424 | return FALSE; |
65765700 JJ |
1425 | |
1426 | eh_frame_sec = bfd_get_section_by_name (abfd, ".eh_frame"); | |
1427 | if (eh_frame_sec == NULL) | |
5ed6aba4 NC |
1428 | { |
1429 | free (contents); | |
1430 | return FALSE; | |
1431 | } | |
65765700 JJ |
1432 | |
1433 | memset (contents, 0, EH_FRAME_HDR_SIZE); | |
5ed6aba4 | 1434 | contents[0] = 1; /* Version. */ |
ec3391e7 AO |
1435 | contents[1] = get_elf_backend_data (abfd)->elf_backend_encode_eh_address |
1436 | (abfd, info, eh_frame_sec, 0, sec, 4, | |
1437 | &encoded_eh_frame); /* .eh_frame offset. */ | |
1438 | ||
65765700 JJ |
1439 | if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) |
1440 | { | |
5ed6aba4 NC |
1441 | contents[2] = DW_EH_PE_udata4; /* FDE count encoding. */ |
1442 | contents[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4; /* Search table enc. */ | |
65765700 JJ |
1443 | } |
1444 | else | |
1445 | { | |
1446 | contents[2] = DW_EH_PE_omit; | |
1447 | contents[3] = DW_EH_PE_omit; | |
1448 | } | |
ec3391e7 AO |
1449 | bfd_put_32 (abfd, encoded_eh_frame, contents + 4); |
1450 | ||
65765700 JJ |
1451 | if (contents[2] != DW_EH_PE_omit) |
1452 | { | |
1453 | unsigned int i; | |
1454 | ||
1455 | bfd_put_32 (abfd, hdr_info->fde_count, contents + EH_FRAME_HDR_SIZE); | |
1456 | qsort (hdr_info->array, hdr_info->fde_count, sizeof (*hdr_info->array), | |
1457 | vma_compare); | |
1458 | for (i = 0; i < hdr_info->fde_count; i++) | |
1459 | { | |
1460 | bfd_put_32 (abfd, | |
1461 | hdr_info->array[i].initial_loc | |
1462 | - sec->output_section->vma, | |
1463 | contents + EH_FRAME_HDR_SIZE + i * 8 + 4); | |
1464 | bfd_put_32 (abfd, | |
1465 | hdr_info->array[i].fde - sec->output_section->vma, | |
1466 | contents + EH_FRAME_HDR_SIZE + i * 8 + 8); | |
1467 | } | |
1468 | } | |
1469 | ||
5ed6aba4 NC |
1470 | retval = bfd_set_section_contents (abfd, sec->output_section, |
1471 | contents, (file_ptr) sec->output_offset, | |
eea6121a | 1472 | sec->size); |
5ed6aba4 NC |
1473 | free (contents); |
1474 | return retval; | |
65765700 | 1475 | } |
ec3391e7 | 1476 | |
8c946ed5 RS |
1477 | /* Return the width of FDE addresses. This is the default implementation. */ |
1478 | ||
1479 | unsigned int | |
1480 | _bfd_elf_eh_frame_address_size (bfd *abfd, asection *sec ATTRIBUTE_UNUSED) | |
1481 | { | |
1482 | return elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64 ? 8 : 4; | |
1483 | } | |
1484 | ||
ec3391e7 AO |
1485 | /* Decide whether we can use a PC-relative encoding within the given |
1486 | EH frame section. This is the default implementation. */ | |
1487 | ||
1488 | bfd_boolean | |
1489 | _bfd_elf_can_make_relative (bfd *input_bfd ATTRIBUTE_UNUSED, | |
1490 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
1491 | asection *eh_frame_section ATTRIBUTE_UNUSED) | |
1492 | { | |
1493 | return TRUE; | |
1494 | } | |
1495 | ||
1496 | /* Select an encoding for the given address. Preference is given to | |
1497 | PC-relative addressing modes. */ | |
1498 | ||
1499 | bfd_byte | |
1500 | _bfd_elf_encode_eh_address (bfd *abfd ATTRIBUTE_UNUSED, | |
1501 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
1502 | asection *osec, bfd_vma offset, | |
1503 | asection *loc_sec, bfd_vma loc_offset, | |
1504 | bfd_vma *encoded) | |
1505 | { | |
1506 | *encoded = osec->vma + offset - | |
1507 | (loc_sec->output_section->vma + loc_sec->output_offset + loc_offset); | |
1508 | return DW_EH_PE_pcrel | DW_EH_PE_sdata4; | |
1509 | } |