Commit | Line | Data |
---|---|---|
65765700 | 1 | /* .eh_frame section optimization. |
aa820537 | 2 | Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
64be1553 | 3 | Free Software Foundation, Inc. |
65765700 JJ |
4 | Written by Jakub Jelinek <jakub@redhat.com>. |
5 | ||
5ed6aba4 | 6 | This file is part of BFD, the Binary File Descriptor library. |
65765700 | 7 | |
5ed6aba4 NC |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
cd123cb7 | 10 | the Free Software Foundation; either version 3 of the License, or |
5ed6aba4 | 11 | (at your option) any later version. |
65765700 | 12 | |
5ed6aba4 NC |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
65765700 | 17 | |
5ed6aba4 NC |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
cd123cb7 NC |
20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
21 | MA 02110-1301, USA. */ | |
65765700 | 22 | |
65765700 | 23 | #include "sysdep.h" |
3db64b00 | 24 | #include "bfd.h" |
65765700 JJ |
25 | #include "libbfd.h" |
26 | #include "elf-bfd.h" | |
fa8f86ff | 27 | #include "dwarf2.h" |
65765700 JJ |
28 | |
29 | #define EH_FRAME_HDR_SIZE 8 | |
30 | ||
bce613b9 JJ |
31 | struct cie |
32 | { | |
33 | unsigned int length; | |
34 | unsigned int hash; | |
35 | unsigned char version; | |
f137a54e | 36 | unsigned char local_personality; |
bce613b9 JJ |
37 | char augmentation[20]; |
38 | bfd_vma code_align; | |
39 | bfd_signed_vma data_align; | |
40 | bfd_vma ra_column; | |
41 | bfd_vma augmentation_size; | |
f137a54e AM |
42 | union { |
43 | struct elf_link_hash_entry *h; | |
44 | bfd_vma val; | |
184d07da | 45 | unsigned int reloc_index; |
f137a54e | 46 | } personality; |
bce613b9 JJ |
47 | asection *output_sec; |
48 | struct eh_cie_fde *cie_inf; | |
49 | unsigned char per_encoding; | |
50 | unsigned char lsda_encoding; | |
51 | unsigned char fde_encoding; | |
52 | unsigned char initial_insn_length; | |
9f4b847e | 53 | unsigned char can_make_lsda_relative; |
bce613b9 JJ |
54 | unsigned char initial_instructions[50]; |
55 | }; | |
56 | ||
57 | ||
58 | ||
2c42be65 RS |
59 | /* If *ITER hasn't reached END yet, read the next byte into *RESULT and |
60 | move onto the next byte. Return true on success. */ | |
61 | ||
62 | static inline bfd_boolean | |
63 | read_byte (bfd_byte **iter, bfd_byte *end, unsigned char *result) | |
64 | { | |
65 | if (*iter >= end) | |
66 | return FALSE; | |
67 | *result = *((*iter)++); | |
68 | return TRUE; | |
69 | } | |
70 | ||
71 | /* Move *ITER over LENGTH bytes, or up to END, whichever is closer. | |
72 | Return true it was possible to move LENGTH bytes. */ | |
73 | ||
74 | static inline bfd_boolean | |
75 | skip_bytes (bfd_byte **iter, bfd_byte *end, bfd_size_type length) | |
76 | { | |
77 | if ((bfd_size_type) (end - *iter) < length) | |
78 | { | |
79 | *iter = end; | |
80 | return FALSE; | |
81 | } | |
82 | *iter += length; | |
83 | return TRUE; | |
84 | } | |
85 | ||
86 | /* Move *ITER over an leb128, stopping at END. Return true if the end | |
87 | of the leb128 was found. */ | |
88 | ||
89 | static bfd_boolean | |
90 | skip_leb128 (bfd_byte **iter, bfd_byte *end) | |
91 | { | |
92 | unsigned char byte; | |
93 | do | |
94 | if (!read_byte (iter, end, &byte)) | |
95 | return FALSE; | |
96 | while (byte & 0x80); | |
97 | return TRUE; | |
98 | } | |
99 | ||
100 | /* Like skip_leb128, but treat the leb128 as an unsigned value and | |
101 | store it in *VALUE. */ | |
102 | ||
103 | static bfd_boolean | |
104 | read_uleb128 (bfd_byte **iter, bfd_byte *end, bfd_vma *value) | |
105 | { | |
106 | bfd_byte *start, *p; | |
107 | ||
108 | start = *iter; | |
109 | if (!skip_leb128 (iter, end)) | |
110 | return FALSE; | |
111 | ||
112 | p = *iter; | |
113 | *value = *--p; | |
114 | while (p > start) | |
115 | *value = (*value << 7) | (*--p & 0x7f); | |
116 | ||
117 | return TRUE; | |
118 | } | |
119 | ||
120 | /* Like read_uleb128, but for signed values. */ | |
121 | ||
122 | static bfd_boolean | |
123 | read_sleb128 (bfd_byte **iter, bfd_byte *end, bfd_signed_vma *value) | |
124 | { | |
125 | bfd_byte *start, *p; | |
126 | ||
127 | start = *iter; | |
128 | if (!skip_leb128 (iter, end)) | |
129 | return FALSE; | |
130 | ||
131 | p = *iter; | |
132 | *value = ((*--p & 0x7f) ^ 0x40) - 0x40; | |
133 | while (p > start) | |
134 | *value = (*value << 7) | (*--p & 0x7f); | |
135 | ||
136 | return TRUE; | |
137 | } | |
65765700 JJ |
138 | |
139 | /* Return 0 if either encoding is variable width, or not yet known to bfd. */ | |
140 | ||
141 | static | |
c39a58e6 | 142 | int get_DW_EH_PE_width (int encoding, int ptr_size) |
65765700 JJ |
143 | { |
144 | /* DW_EH_PE_ values of 0x60 and 0x70 weren't defined at the time .eh_frame | |
145 | was added to bfd. */ | |
146 | if ((encoding & 0x60) == 0x60) | |
147 | return 0; | |
148 | ||
149 | switch (encoding & 7) | |
150 | { | |
151 | case DW_EH_PE_udata2: return 2; | |
152 | case DW_EH_PE_udata4: return 4; | |
153 | case DW_EH_PE_udata8: return 8; | |
154 | case DW_EH_PE_absptr: return ptr_size; | |
155 | default: | |
156 | break; | |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
84f97cb6 AS |
162 | #define get_DW_EH_PE_signed(encoding) (((encoding) & DW_EH_PE_signed) != 0) |
163 | ||
9e2a4898 JJ |
164 | /* Read a width sized value from memory. */ |
165 | ||
166 | static bfd_vma | |
c39a58e6 | 167 | read_value (bfd *abfd, bfd_byte *buf, int width, int is_signed) |
9e2a4898 JJ |
168 | { |
169 | bfd_vma value; | |
170 | ||
171 | switch (width) | |
172 | { | |
84f97cb6 AS |
173 | case 2: |
174 | if (is_signed) | |
175 | value = bfd_get_signed_16 (abfd, buf); | |
176 | else | |
177 | value = bfd_get_16 (abfd, buf); | |
178 | break; | |
179 | case 4: | |
180 | if (is_signed) | |
181 | value = bfd_get_signed_32 (abfd, buf); | |
182 | else | |
183 | value = bfd_get_32 (abfd, buf); | |
184 | break; | |
185 | case 8: | |
186 | if (is_signed) | |
187 | value = bfd_get_signed_64 (abfd, buf); | |
188 | else | |
189 | value = bfd_get_64 (abfd, buf); | |
190 | break; | |
191 | default: | |
192 | BFD_FAIL (); | |
193 | return 0; | |
9e2a4898 JJ |
194 | } |
195 | ||
196 | return value; | |
197 | } | |
b34976b6 | 198 | |
9e2a4898 JJ |
199 | /* Store a width sized value to memory. */ |
200 | ||
201 | static void | |
c39a58e6 | 202 | write_value (bfd *abfd, bfd_byte *buf, bfd_vma value, int width) |
9e2a4898 JJ |
203 | { |
204 | switch (width) | |
205 | { | |
206 | case 2: bfd_put_16 (abfd, value, buf); break; | |
207 | case 4: bfd_put_32 (abfd, value, buf); break; | |
208 | case 8: bfd_put_64 (abfd, value, buf); break; | |
209 | default: BFD_FAIL (); | |
210 | } | |
211 | } | |
212 | ||
bce613b9 | 213 | /* Return one if C1 and C2 CIEs can be merged. */ |
65765700 | 214 | |
bce613b9 JJ |
215 | static int |
216 | cie_eq (const void *e1, const void *e2) | |
65765700 | 217 | { |
a50b1753 NC |
218 | const struct cie *c1 = (const struct cie *) e1; |
219 | const struct cie *c2 = (const struct cie *) e2; | |
bce613b9 JJ |
220 | |
221 | if (c1->hash == c2->hash | |
222 | && c1->length == c2->length | |
65765700 | 223 | && c1->version == c2->version |
f137a54e | 224 | && c1->local_personality == c2->local_personality |
65765700 JJ |
225 | && strcmp (c1->augmentation, c2->augmentation) == 0 |
226 | && strcmp (c1->augmentation, "eh") != 0 | |
227 | && c1->code_align == c2->code_align | |
228 | && c1->data_align == c2->data_align | |
229 | && c1->ra_column == c2->ra_column | |
230 | && c1->augmentation_size == c2->augmentation_size | |
f137a54e AM |
231 | && memcmp (&c1->personality, &c2->personality, |
232 | sizeof (c1->personality)) == 0 | |
bce613b9 | 233 | && c1->output_sec == c2->output_sec |
65765700 JJ |
234 | && c1->per_encoding == c2->per_encoding |
235 | && c1->lsda_encoding == c2->lsda_encoding | |
236 | && c1->fde_encoding == c2->fde_encoding | |
c39a58e6 | 237 | && c1->initial_insn_length == c2->initial_insn_length |
65765700 JJ |
238 | && memcmp (c1->initial_instructions, |
239 | c2->initial_instructions, | |
240 | c1->initial_insn_length) == 0) | |
bce613b9 | 241 | return 1; |
65765700 | 242 | |
bce613b9 JJ |
243 | return 0; |
244 | } | |
245 | ||
246 | static hashval_t | |
247 | cie_hash (const void *e) | |
248 | { | |
a50b1753 | 249 | const struct cie *c = (const struct cie *) e; |
bce613b9 JJ |
250 | return c->hash; |
251 | } | |
252 | ||
253 | static hashval_t | |
254 | cie_compute_hash (struct cie *c) | |
255 | { | |
256 | hashval_t h = 0; | |
257 | h = iterative_hash_object (c->length, h); | |
258 | h = iterative_hash_object (c->version, h); | |
259 | h = iterative_hash (c->augmentation, strlen (c->augmentation) + 1, h); | |
260 | h = iterative_hash_object (c->code_align, h); | |
261 | h = iterative_hash_object (c->data_align, h); | |
262 | h = iterative_hash_object (c->ra_column, h); | |
263 | h = iterative_hash_object (c->augmentation_size, h); | |
264 | h = iterative_hash_object (c->personality, h); | |
265 | h = iterative_hash_object (c->output_sec, h); | |
266 | h = iterative_hash_object (c->per_encoding, h); | |
267 | h = iterative_hash_object (c->lsda_encoding, h); | |
268 | h = iterative_hash_object (c->fde_encoding, h); | |
269 | h = iterative_hash_object (c->initial_insn_length, h); | |
270 | h = iterative_hash (c->initial_instructions, c->initial_insn_length, h); | |
271 | c->hash = h; | |
272 | return h; | |
65765700 JJ |
273 | } |
274 | ||
353057a5 RS |
275 | /* Return the number of extra bytes that we'll be inserting into |
276 | ENTRY's augmentation string. */ | |
277 | ||
278 | static INLINE unsigned int | |
279 | extra_augmentation_string_bytes (struct eh_cie_fde *entry) | |
280 | { | |
281 | unsigned int size = 0; | |
282 | if (entry->cie) | |
283 | { | |
284 | if (entry->add_augmentation_size) | |
285 | size++; | |
6b2cc140 | 286 | if (entry->u.cie.add_fde_encoding) |
353057a5 RS |
287 | size++; |
288 | } | |
289 | return size; | |
290 | } | |
291 | ||
292 | /* Likewise ENTRY's augmentation data. */ | |
293 | ||
294 | static INLINE unsigned int | |
295 | extra_augmentation_data_bytes (struct eh_cie_fde *entry) | |
296 | { | |
297 | unsigned int size = 0; | |
6b2cc140 RS |
298 | if (entry->add_augmentation_size) |
299 | size++; | |
300 | if (entry->cie && entry->u.cie.add_fde_encoding) | |
301 | size++; | |
353057a5 RS |
302 | return size; |
303 | } | |
304 | ||
305 | /* Return the size that ENTRY will have in the output. ALIGNMENT is the | |
306 | required alignment of ENTRY in bytes. */ | |
307 | ||
308 | static unsigned int | |
309 | size_of_output_cie_fde (struct eh_cie_fde *entry, unsigned int alignment) | |
310 | { | |
311 | if (entry->removed) | |
312 | return 0; | |
313 | if (entry->size == 4) | |
314 | return 4; | |
315 | return (entry->size | |
316 | + extra_augmentation_string_bytes (entry) | |
317 | + extra_augmentation_data_bytes (entry) | |
318 | + alignment - 1) & -alignment; | |
319 | } | |
320 | ||
dcf507a6 RS |
321 | /* Assume that the bytes between *ITER and END are CFA instructions. |
322 | Try to move *ITER past the first instruction and return true on | |
323 | success. ENCODED_PTR_WIDTH gives the width of pointer entries. */ | |
324 | ||
325 | static bfd_boolean | |
326 | skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) | |
327 | { | |
328 | bfd_byte op; | |
329 | bfd_vma length; | |
330 | ||
331 | if (!read_byte (iter, end, &op)) | |
332 | return FALSE; | |
333 | ||
ac685e6a | 334 | switch (op & 0xc0 ? op & 0xc0 : op) |
dcf507a6 RS |
335 | { |
336 | case DW_CFA_nop: | |
337 | case DW_CFA_advance_loc: | |
338 | case DW_CFA_restore: | |
ac685e6a JJ |
339 | case DW_CFA_remember_state: |
340 | case DW_CFA_restore_state: | |
341 | case DW_CFA_GNU_window_save: | |
dcf507a6 RS |
342 | /* No arguments. */ |
343 | return TRUE; | |
344 | ||
345 | case DW_CFA_offset: | |
346 | case DW_CFA_restore_extended: | |
347 | case DW_CFA_undefined: | |
348 | case DW_CFA_same_value: | |
349 | case DW_CFA_def_cfa_register: | |
350 | case DW_CFA_def_cfa_offset: | |
351 | case DW_CFA_def_cfa_offset_sf: | |
352 | case DW_CFA_GNU_args_size: | |
353 | /* One leb128 argument. */ | |
354 | return skip_leb128 (iter, end); | |
355 | ||
ac685e6a JJ |
356 | case DW_CFA_val_offset: |
357 | case DW_CFA_val_offset_sf: | |
dcf507a6 RS |
358 | case DW_CFA_offset_extended: |
359 | case DW_CFA_register: | |
360 | case DW_CFA_def_cfa: | |
361 | case DW_CFA_offset_extended_sf: | |
362 | case DW_CFA_GNU_negative_offset_extended: | |
363 | case DW_CFA_def_cfa_sf: | |
364 | /* Two leb128 arguments. */ | |
365 | return (skip_leb128 (iter, end) | |
366 | && skip_leb128 (iter, end)); | |
367 | ||
368 | case DW_CFA_def_cfa_expression: | |
369 | /* A variable-length argument. */ | |
370 | return (read_uleb128 (iter, end, &length) | |
371 | && skip_bytes (iter, end, length)); | |
372 | ||
373 | case DW_CFA_expression: | |
ac685e6a | 374 | case DW_CFA_val_expression: |
dcf507a6 RS |
375 | /* A leb128 followed by a variable-length argument. */ |
376 | return (skip_leb128 (iter, end) | |
377 | && read_uleb128 (iter, end, &length) | |
378 | && skip_bytes (iter, end, length)); | |
379 | ||
380 | case DW_CFA_set_loc: | |
381 | return skip_bytes (iter, end, encoded_ptr_width); | |
382 | ||
383 | case DW_CFA_advance_loc1: | |
384 | return skip_bytes (iter, end, 1); | |
385 | ||
386 | case DW_CFA_advance_loc2: | |
387 | return skip_bytes (iter, end, 2); | |
388 | ||
389 | case DW_CFA_advance_loc4: | |
390 | return skip_bytes (iter, end, 4); | |
391 | ||
392 | case DW_CFA_MIPS_advance_loc8: | |
393 | return skip_bytes (iter, end, 8); | |
394 | ||
395 | default: | |
396 | return FALSE; | |
397 | } | |
398 | } | |
399 | ||
400 | /* Try to interpret the bytes between BUF and END as CFA instructions. | |
401 | If every byte makes sense, return a pointer to the first DW_CFA_nop | |
402 | padding byte, or END if there is no padding. Return null otherwise. | |
403 | ENCODED_PTR_WIDTH is as for skip_cfa_op. */ | |
404 | ||
405 | static bfd_byte * | |
ac685e6a JJ |
406 | skip_non_nops (bfd_byte *buf, bfd_byte *end, unsigned int encoded_ptr_width, |
407 | unsigned int *set_loc_count) | |
dcf507a6 RS |
408 | { |
409 | bfd_byte *last; | |
410 | ||
411 | last = buf; | |
412 | while (buf < end) | |
413 | if (*buf == DW_CFA_nop) | |
414 | buf++; | |
415 | else | |
416 | { | |
ac685e6a JJ |
417 | if (*buf == DW_CFA_set_loc) |
418 | ++*set_loc_count; | |
dcf507a6 RS |
419 | if (!skip_cfa_op (&buf, end, encoded_ptr_width)) |
420 | return 0; | |
421 | last = buf; | |
422 | } | |
423 | return last; | |
424 | } | |
425 | ||
30af5962 RS |
426 | /* Convert absolute encoding ENCODING into PC-relative form. |
427 | SIZE is the size of a pointer. */ | |
428 | ||
429 | static unsigned char | |
430 | make_pc_relative (unsigned char encoding, unsigned int ptr_size) | |
431 | { | |
432 | if ((encoding & 0x7f) == DW_EH_PE_absptr) | |
433 | switch (ptr_size) | |
434 | { | |
435 | case 2: | |
436 | encoding |= DW_EH_PE_sdata2; | |
437 | break; | |
438 | case 4: | |
439 | encoding |= DW_EH_PE_sdata4; | |
440 | break; | |
441 | case 8: | |
442 | encoding |= DW_EH_PE_sdata8; | |
443 | break; | |
444 | } | |
445 | return encoding | DW_EH_PE_pcrel; | |
446 | } | |
447 | ||
ca92cecb RS |
448 | /* Called before calling _bfd_elf_parse_eh_frame on every input bfd's |
449 | .eh_frame section. */ | |
65765700 | 450 | |
ca92cecb RS |
451 | void |
452 | _bfd_elf_begin_eh_frame_parsing (struct bfd_link_info *info) | |
453 | { | |
454 | struct eh_frame_hdr_info *hdr_info; | |
455 | ||
456 | hdr_info = &elf_hash_table (info)->eh_info; | |
184d07da | 457 | hdr_info->merge_cies = !info->relocatable; |
ca92cecb RS |
458 | } |
459 | ||
460 | /* Try to parse .eh_frame section SEC, which belongs to ABFD. Store the | |
461 | information in the section's sec_info field on success. COOKIE | |
462 | describes the relocations in SEC. */ | |
463 | ||
464 | void | |
465 | _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info, | |
466 | asection *sec, struct elf_reloc_cookie *cookie) | |
65765700 | 467 | { |
acfe5567 RS |
468 | #define REQUIRE(COND) \ |
469 | do \ | |
470 | if (!(COND)) \ | |
471 | goto free_no_table; \ | |
472 | while (0) | |
473 | ||
ca92cecb | 474 | bfd_byte *ehbuf = NULL, *buf, *end; |
bce613b9 | 475 | bfd_byte *last_fde; |
ca92cecb | 476 | struct eh_cie_fde *this_inf; |
bce613b9 | 477 | unsigned int hdr_length, hdr_id; |
184d07da RS |
478 | unsigned int cie_count; |
479 | struct cie *cie, *local_cies = NULL; | |
126495ed | 480 | struct elf_link_hash_table *htab; |
65765700 | 481 | struct eh_frame_hdr_info *hdr_info; |
68f69152 | 482 | struct eh_frame_sec_info *sec_info = NULL; |
65765700 | 483 | unsigned int ptr_size; |
ca92cecb RS |
484 | unsigned int num_cies; |
485 | unsigned int num_entries; | |
9d0a14d3 | 486 | elf_gc_mark_hook_fn gc_mark_hook; |
ca92cecb RS |
487 | |
488 | htab = elf_hash_table (info); | |
489 | hdr_info = &htab->eh_info; | |
490 | if (hdr_info->parsed_eh_frames) | |
491 | return; | |
65765700 | 492 | |
eea6121a | 493 | if (sec->size == 0) |
65765700 JJ |
494 | { |
495 | /* This file does not contain .eh_frame information. */ | |
ca92cecb | 496 | return; |
65765700 JJ |
497 | } |
498 | ||
e460dd0d | 499 | if (bfd_is_abs_section (sec->output_section)) |
65765700 JJ |
500 | { |
501 | /* At least one of the sections is being discarded from the | |
3472e2e9 | 502 | link, so we should just ignore them. */ |
ca92cecb | 503 | return; |
65765700 JJ |
504 | } |
505 | ||
506 | /* Read the frame unwind information from abfd. */ | |
507 | ||
acfe5567 | 508 | REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf)); |
68f69152 | 509 | |
eea6121a | 510 | if (sec->size >= 4 |
65765700 JJ |
511 | && bfd_get_32 (abfd, ehbuf) == 0 |
512 | && cookie->rel == cookie->relend) | |
513 | { | |
514 | /* Empty .eh_frame section. */ | |
515 | free (ehbuf); | |
ca92cecb | 516 | return; |
65765700 JJ |
517 | } |
518 | ||
65765700 JJ |
519 | /* If .eh_frame section size doesn't fit into int, we cannot handle |
520 | it (it would need to use 64-bit .eh_frame format anyway). */ | |
acfe5567 | 521 | REQUIRE (sec->size == (unsigned int) sec->size); |
65765700 | 522 | |
8c946ed5 RS |
523 | ptr_size = (get_elf_backend_data (abfd) |
524 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
525 | REQUIRE (ptr_size != 0); | |
526 | ||
ca92cecb RS |
527 | /* Go through the section contents and work out how many FDEs and |
528 | CIEs there are. */ | |
65765700 | 529 | buf = ehbuf; |
ca92cecb RS |
530 | end = ehbuf + sec->size; |
531 | num_cies = 0; | |
532 | num_entries = 0; | |
533 | while (buf != end) | |
534 | { | |
535 | num_entries++; | |
536 | ||
537 | /* Read the length of the entry. */ | |
538 | REQUIRE (skip_bytes (&buf, end, 4)); | |
539 | hdr_length = bfd_get_32 (abfd, buf - 4); | |
540 | ||
541 | /* 64-bit .eh_frame is not supported. */ | |
542 | REQUIRE (hdr_length != 0xffffffff); | |
543 | if (hdr_length == 0) | |
544 | break; | |
545 | ||
546 | REQUIRE (skip_bytes (&buf, end, 4)); | |
547 | hdr_id = bfd_get_32 (abfd, buf - 4); | |
548 | if (hdr_id == 0) | |
549 | num_cies++; | |
550 | ||
551 | REQUIRE (skip_bytes (&buf, end, hdr_length - 4)); | |
552 | } | |
553 | ||
a50b1753 NC |
554 | sec_info = (struct eh_frame_sec_info *) |
555 | bfd_zmalloc (sizeof (struct eh_frame_sec_info) | |
556 | + (num_entries - 1) * sizeof (struct eh_cie_fde)); | |
acfe5567 | 557 | REQUIRE (sec_info); |
eea6121a | 558 | |
184d07da | 559 | /* We need to have a "struct cie" for each CIE in this section. */ |
a50b1753 | 560 | local_cies = (struct cie *) bfd_zmalloc (num_cies * sizeof (*local_cies)); |
184d07da | 561 | REQUIRE (local_cies); |
65765700 | 562 | |
5dabe785 | 563 | /* FIXME: octets_per_byte. */ |
65765700 | 564 | #define ENSURE_NO_RELOCS(buf) \ |
acfe5567 RS |
565 | REQUIRE (!(cookie->rel < cookie->relend \ |
566 | && (cookie->rel->r_offset \ | |
567 | < (bfd_size_type) ((buf) - ehbuf)) \ | |
568 | && cookie->rel->r_info != 0)) | |
65765700 | 569 | |
5dabe785 | 570 | /* FIXME: octets_per_byte. */ |
65765700 JJ |
571 | #define SKIP_RELOCS(buf) \ |
572 | while (cookie->rel < cookie->relend \ | |
3472e2e9 | 573 | && (cookie->rel->r_offset \ |
65765700 JJ |
574 | < (bfd_size_type) ((buf) - ehbuf))) \ |
575 | cookie->rel++ | |
576 | ||
5dabe785 | 577 | /* FIXME: octets_per_byte. */ |
65765700 JJ |
578 | #define GET_RELOC(buf) \ |
579 | ((cookie->rel < cookie->relend \ | |
580 | && (cookie->rel->r_offset \ | |
3472e2e9 | 581 | == (bfd_size_type) ((buf) - ehbuf))) \ |
65765700 JJ |
582 | ? cookie->rel : NULL) |
583 | ||
ca92cecb | 584 | buf = ehbuf; |
184d07da | 585 | cie_count = 0; |
9d0a14d3 | 586 | gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook; |
ca92cecb | 587 | while ((bfd_size_type) (buf - ehbuf) != sec->size) |
65765700 | 588 | { |
f075ee0c | 589 | char *aug; |
ca92cecb | 590 | bfd_byte *start, *insns, *insns_end; |
2c42be65 | 591 | bfd_size_type length; |
ac685e6a | 592 | unsigned int set_loc_count; |
65765700 | 593 | |
fda3ecf2 | 594 | this_inf = sec_info->entry + sec_info->count; |
65765700 | 595 | last_fde = buf; |
bce613b9 | 596 | |
bce613b9 JJ |
597 | /* Read the length of the entry. */ |
598 | REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); | |
599 | hdr_length = bfd_get_32 (abfd, buf - 4); | |
acfe5567 | 600 | |
bce613b9 JJ |
601 | /* The CIE/FDE must be fully contained in this input section. */ |
602 | REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr_length <= sec->size); | |
603 | end = buf + hdr_length; | |
65765700 | 604 | |
bce613b9 JJ |
605 | this_inf->offset = last_fde - ehbuf; |
606 | this_inf->size = 4 + hdr_length; | |
155eaaa0 | 607 | this_inf->reloc_index = cookie->rel - cookie->rels; |
bce613b9 JJ |
608 | |
609 | if (hdr_length == 0) | |
610 | { | |
611 | /* A zero-length CIE should only be found at the end of | |
612 | the section. */ | |
613 | REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); | |
614 | ENSURE_NO_RELOCS (buf); | |
615 | sec_info->count++; | |
616 | break; | |
65765700 JJ |
617 | } |
618 | ||
bce613b9 JJ |
619 | REQUIRE (skip_bytes (&buf, end, 4)); |
620 | hdr_id = bfd_get_32 (abfd, buf - 4); | |
621 | ||
622 | if (hdr_id == 0) | |
65765700 JJ |
623 | { |
624 | unsigned int initial_insn_length; | |
625 | ||
626 | /* CIE */ | |
bce613b9 JJ |
627 | this_inf->cie = 1; |
628 | ||
184d07da RS |
629 | /* Point CIE to one of the section-local cie structures. */ |
630 | cie = local_cies + cie_count++; | |
631 | ||
ca92cecb | 632 | cie->cie_inf = this_inf; |
bce613b9 | 633 | cie->length = hdr_length; |
ca92cecb | 634 | cie->output_sec = sec->output_section; |
ac685e6a | 635 | start = buf; |
bce613b9 | 636 | REQUIRE (read_byte (&buf, end, &cie->version)); |
65765700 JJ |
637 | |
638 | /* Cannot handle unknown versions. */ | |
bce613b9 JJ |
639 | REQUIRE (cie->version == 1 || cie->version == 3); |
640 | REQUIRE (strlen ((char *) buf) < sizeof (cie->augmentation)); | |
65765700 | 641 | |
bce613b9 | 642 | strcpy (cie->augmentation, (char *) buf); |
f075ee0c | 643 | buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1; |
65765700 JJ |
644 | ENSURE_NO_RELOCS (buf); |
645 | if (buf[0] == 'e' && buf[1] == 'h') | |
646 | { | |
647 | /* GCC < 3.0 .eh_frame CIE */ | |
648 | /* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__ | |
649 | is private to each CIE, so we don't need it for anything. | |
650 | Just skip it. */ | |
2c42be65 | 651 | REQUIRE (skip_bytes (&buf, end, ptr_size)); |
65765700 JJ |
652 | SKIP_RELOCS (buf); |
653 | } | |
bce613b9 JJ |
654 | REQUIRE (read_uleb128 (&buf, end, &cie->code_align)); |
655 | REQUIRE (read_sleb128 (&buf, end, &cie->data_align)); | |
656 | if (cie->version == 1) | |
2c42be65 RS |
657 | { |
658 | REQUIRE (buf < end); | |
bce613b9 | 659 | cie->ra_column = *buf++; |
2c42be65 | 660 | } |
0da76f83 | 661 | else |
bce613b9 | 662 | REQUIRE (read_uleb128 (&buf, end, &cie->ra_column)); |
65765700 | 663 | ENSURE_NO_RELOCS (buf); |
bce613b9 JJ |
664 | cie->lsda_encoding = DW_EH_PE_omit; |
665 | cie->fde_encoding = DW_EH_PE_omit; | |
666 | cie->per_encoding = DW_EH_PE_omit; | |
667 | aug = cie->augmentation; | |
65765700 JJ |
668 | if (aug[0] != 'e' || aug[1] != 'h') |
669 | { | |
670 | if (*aug == 'z') | |
671 | { | |
672 | aug++; | |
bce613b9 | 673 | REQUIRE (read_uleb128 (&buf, end, &cie->augmentation_size)); |
65765700 JJ |
674 | ENSURE_NO_RELOCS (buf); |
675 | } | |
676 | ||
677 | while (*aug != '\0') | |
678 | switch (*aug++) | |
679 | { | |
680 | case 'L': | |
bce613b9 | 681 | REQUIRE (read_byte (&buf, end, &cie->lsda_encoding)); |
65765700 | 682 | ENSURE_NO_RELOCS (buf); |
bce613b9 | 683 | REQUIRE (get_DW_EH_PE_width (cie->lsda_encoding, ptr_size)); |
65765700 JJ |
684 | break; |
685 | case 'R': | |
bce613b9 | 686 | REQUIRE (read_byte (&buf, end, &cie->fde_encoding)); |
65765700 | 687 | ENSURE_NO_RELOCS (buf); |
bce613b9 | 688 | REQUIRE (get_DW_EH_PE_width (cie->fde_encoding, ptr_size)); |
65765700 | 689 | break; |
63752a75 JJ |
690 | case 'S': |
691 | break; | |
65765700 JJ |
692 | case 'P': |
693 | { | |
694 | int per_width; | |
695 | ||
bce613b9 JJ |
696 | REQUIRE (read_byte (&buf, end, &cie->per_encoding)); |
697 | per_width = get_DW_EH_PE_width (cie->per_encoding, | |
65765700 | 698 | ptr_size); |
acfe5567 | 699 | REQUIRE (per_width); |
18e04883 | 700 | if ((cie->per_encoding & 0x70) == DW_EH_PE_aligned) |
2c42be65 RS |
701 | { |
702 | length = -(buf - ehbuf) & (per_width - 1); | |
703 | REQUIRE (skip_bytes (&buf, end, length)); | |
704 | } | |
18e04883 | 705 | this_inf->u.cie.personality_offset = buf - start; |
65765700 | 706 | ENSURE_NO_RELOCS (buf); |
f137a54e | 707 | /* Ensure we have a reloc here. */ |
184d07da RS |
708 | REQUIRE (GET_RELOC (buf)); |
709 | cie->personality.reloc_index | |
710 | = cookie->rel - cookie->rels; | |
711 | /* Cope with MIPS-style composite relocations. */ | |
712 | do | |
713 | cookie->rel++; | |
714 | while (GET_RELOC (buf) != NULL); | |
2c42be65 | 715 | REQUIRE (skip_bytes (&buf, end, per_width)); |
65765700 JJ |
716 | } |
717 | break; | |
718 | default: | |
719 | /* Unrecognized augmentation. Better bail out. */ | |
720 | goto free_no_table; | |
721 | } | |
722 | } | |
723 | ||
724 | /* For shared libraries, try to get rid of as many RELATIVE relocs | |
0bb2d96a | 725 | as possible. */ |
3472e2e9 | 726 | if (info->shared |
ec3391e7 AO |
727 | && (get_elf_backend_data (abfd) |
728 | ->elf_backend_can_make_relative_eh_frame | |
353057a5 RS |
729 | (abfd, info, sec))) |
730 | { | |
18e04883 | 731 | if ((cie->fde_encoding & 0x70) == DW_EH_PE_absptr) |
6b2cc140 | 732 | this_inf->make_relative = 1; |
353057a5 RS |
733 | /* If the CIE doesn't already have an 'R' entry, it's fairly |
734 | easy to add one, provided that there's no aligned data | |
735 | after the augmentation string. */ | |
bce613b9 | 736 | else if (cie->fde_encoding == DW_EH_PE_omit |
18e04883 | 737 | && (cie->per_encoding & 0x70) != DW_EH_PE_aligned) |
353057a5 | 738 | { |
bce613b9 | 739 | if (*cie->augmentation == 0) |
353057a5 | 740 | this_inf->add_augmentation_size = 1; |
6b2cc140 RS |
741 | this_inf->u.cie.add_fde_encoding = 1; |
742 | this_inf->make_relative = 1; | |
353057a5 | 743 | } |
65765700 | 744 | |
18e04883 RS |
745 | if ((cie->lsda_encoding & 0x70) == DW_EH_PE_absptr) |
746 | cie->can_make_lsda_relative = 1; | |
747 | } | |
9e2a4898 | 748 | |
65765700 JJ |
749 | /* If FDE encoding was not specified, it defaults to |
750 | DW_EH_absptr. */ | |
bce613b9 JJ |
751 | if (cie->fde_encoding == DW_EH_PE_omit) |
752 | cie->fde_encoding = DW_EH_PE_absptr; | |
65765700 | 753 | |
dcf507a6 | 754 | initial_insn_length = end - buf; |
bce613b9 | 755 | if (initial_insn_length <= sizeof (cie->initial_instructions)) |
65765700 | 756 | { |
bce613b9 JJ |
757 | cie->initial_insn_length = initial_insn_length; |
758 | memcpy (cie->initial_instructions, buf, initial_insn_length); | |
65765700 | 759 | } |
dcf507a6 | 760 | insns = buf; |
65765700 JJ |
761 | buf += initial_insn_length; |
762 | ENSURE_NO_RELOCS (buf); | |
ca92cecb | 763 | |
184d07da RS |
764 | if (hdr_info->merge_cies) |
765 | this_inf->u.cie.u.full_cie = cie; | |
6b2cc140 | 766 | this_inf->u.cie.per_encoding_relative |
ca92cecb | 767 | = (cie->per_encoding & 0x70) == DW_EH_PE_pcrel; |
65765700 JJ |
768 | } |
769 | else | |
770 | { | |
9d0a14d3 RS |
771 | asection *rsec; |
772 | ||
bce613b9 JJ |
773 | /* Find the corresponding CIE. */ |
774 | unsigned int cie_offset = this_inf->offset + 4 - hdr_id; | |
184d07da RS |
775 | for (cie = local_cies; cie < local_cies + cie_count; cie++) |
776 | if (cie_offset == cie->cie_inf->offset) | |
bce613b9 JJ |
777 | break; |
778 | ||
779 | /* Ensure this FDE references one of the CIEs in this input | |
780 | section. */ | |
184d07da RS |
781 | REQUIRE (cie != local_cies + cie_count); |
782 | this_inf->u.fde.cie_inf = cie->cie_inf; | |
783 | this_inf->make_relative = cie->cie_inf->make_relative; | |
6b2cc140 | 784 | this_inf->add_augmentation_size |
184d07da | 785 | = cie->cie_inf->add_augmentation_size; |
65765700 JJ |
786 | |
787 | ENSURE_NO_RELOCS (buf); | |
acfe5567 | 788 | REQUIRE (GET_RELOC (buf)); |
fda3ecf2 | 789 | |
9d0a14d3 RS |
790 | /* Chain together the FDEs for each section. */ |
791 | rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie); | |
2a7b2e88 JK |
792 | /* RSEC will be NULL if FDE was cleared out as it was belonging to |
793 | a discarded SHT_GROUP. */ | |
794 | if (rsec) | |
795 | { | |
796 | REQUIRE (rsec->owner == abfd); | |
797 | this_inf->u.fde.next_for_section = elf_fde_list (rsec); | |
798 | elf_fde_list (rsec) = this_inf; | |
799 | } | |
9d0a14d3 | 800 | |
2c42be65 RS |
801 | /* Skip the initial location and address range. */ |
802 | start = buf; | |
bce613b9 | 803 | length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); |
2c42be65 RS |
804 | REQUIRE (skip_bytes (&buf, end, 2 * length)); |
805 | ||
806 | /* Skip the augmentation size, if present. */ | |
bce613b9 | 807 | if (cie->augmentation[0] == 'z') |
dcf507a6 RS |
808 | REQUIRE (read_uleb128 (&buf, end, &length)); |
809 | else | |
810 | length = 0; | |
2c42be65 RS |
811 | |
812 | /* Of the supported augmentation characters above, only 'L' | |
813 | adds augmentation data to the FDE. This code would need to | |
814 | be adjusted if any future augmentations do the same thing. */ | |
bce613b9 | 815 | if (cie->lsda_encoding != DW_EH_PE_omit) |
dcf507a6 | 816 | { |
9f4b847e RS |
817 | SKIP_RELOCS (buf); |
818 | if (cie->can_make_lsda_relative && GET_RELOC (buf)) | |
819 | cie->cie_inf->u.cie.make_lsda_relative = 1; | |
dcf507a6 RS |
820 | this_inf->lsda_offset = buf - start; |
821 | /* If there's no 'z' augmentation, we don't know where the | |
822 | CFA insns begin. Assume no padding. */ | |
bce613b9 | 823 | if (cie->augmentation[0] != 'z') |
dcf507a6 RS |
824 | length = end - buf; |
825 | } | |
826 | ||
827 | /* Skip over the augmentation data. */ | |
828 | REQUIRE (skip_bytes (&buf, end, length)); | |
829 | insns = buf; | |
9e2a4898 | 830 | |
bce613b9 | 831 | buf = last_fde + 4 + hdr_length; |
2a7b2e88 | 832 | |
273f4430 JK |
833 | /* For NULL RSEC (cleared FDE belonging to a discarded section) |
834 | the relocations are commonly cleared. We do not sanity check if | |
835 | all these relocations are cleared as (1) relocations to | |
836 | .gcc_except_table will remain uncleared (they will get dropped | |
837 | with the drop of this unused FDE) and (2) BFD already safely drops | |
838 | relocations of any type to .eh_frame by | |
839 | elf_section_ignore_discarded_relocs. | |
840 | TODO: The .gcc_except_table entries should be also filtered as | |
841 | .eh_frame entries; or GCC could rather use COMDAT for them. */ | |
842 | SKIP_RELOCS (buf); | |
65765700 JJ |
843 | } |
844 | ||
dcf507a6 RS |
845 | /* Try to interpret the CFA instructions and find the first |
846 | padding nop. Shrink this_inf's size so that it doesn't | |
ac685e6a | 847 | include the padding. */ |
bce613b9 | 848 | length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); |
ac685e6a JJ |
849 | set_loc_count = 0; |
850 | insns_end = skip_non_nops (insns, end, length, &set_loc_count); | |
851 | /* If we don't understand the CFA instructions, we can't know | |
852 | what needs to be adjusted there. */ | |
853 | if (insns_end == NULL | |
854 | /* For the time being we don't support DW_CFA_set_loc in | |
855 | CIE instructions. */ | |
856 | || (set_loc_count && this_inf->cie)) | |
857 | goto free_no_table; | |
858 | this_inf->size -= end - insns_end; | |
bce613b9 JJ |
859 | if (insns_end != end && this_inf->cie) |
860 | { | |
861 | cie->initial_insn_length -= end - insns_end; | |
862 | cie->length -= end - insns_end; | |
863 | } | |
ac685e6a | 864 | if (set_loc_count |
18e04883 | 865 | && ((cie->fde_encoding & 0x70) == DW_EH_PE_pcrel |
6b2cc140 | 866 | || this_inf->make_relative)) |
ac685e6a JJ |
867 | { |
868 | unsigned int cnt; | |
869 | bfd_byte *p; | |
870 | ||
a50b1753 NC |
871 | this_inf->set_loc = (unsigned int *) |
872 | bfd_malloc ((set_loc_count + 1) * sizeof (unsigned int)); | |
ac685e6a JJ |
873 | REQUIRE (this_inf->set_loc); |
874 | this_inf->set_loc[0] = set_loc_count; | |
875 | p = insns; | |
876 | cnt = 0; | |
877 | while (p < end) | |
878 | { | |
879 | if (*p == DW_CFA_set_loc) | |
880 | this_inf->set_loc[++cnt] = p + 1 - start; | |
881 | REQUIRE (skip_cfa_op (&p, end, length)); | |
882 | } | |
883 | } | |
dcf507a6 | 884 | |
ca92cecb | 885 | this_inf->removed = 1; |
bce613b9 JJ |
886 | this_inf->fde_encoding = cie->fde_encoding; |
887 | this_inf->lsda_encoding = cie->lsda_encoding; | |
65765700 JJ |
888 | sec_info->count++; |
889 | } | |
ca92cecb | 890 | BFD_ASSERT (sec_info->count == num_entries); |
184d07da | 891 | BFD_ASSERT (cie_count == num_cies); |
65765700 JJ |
892 | |
893 | elf_section_data (sec)->sec_info = sec_info; | |
68bfbfcc | 894 | sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME; |
184d07da RS |
895 | if (hdr_info->merge_cies) |
896 | { | |
897 | sec_info->cies = local_cies; | |
898 | local_cies = NULL; | |
899 | } | |
ca92cecb | 900 | goto success; |
65765700 | 901 | |
ca92cecb RS |
902 | free_no_table: |
903 | (*info->callbacks->einfo) | |
904 | (_("%P: error in %B(%A); no .eh_frame_hdr table will be created.\n"), | |
905 | abfd, sec); | |
906 | hdr_info->table = FALSE; | |
907 | if (sec_info) | |
908 | free (sec_info); | |
909 | success: | |
910 | if (ehbuf) | |
911 | free (ehbuf); | |
ca92cecb RS |
912 | if (local_cies) |
913 | free (local_cies); | |
914 | #undef REQUIRE | |
915 | } | |
bce613b9 | 916 | |
ca92cecb RS |
917 | /* Finish a pass over all .eh_frame sections. */ |
918 | ||
919 | void | |
920 | _bfd_elf_end_eh_frame_parsing (struct bfd_link_info *info) | |
921 | { | |
922 | struct eh_frame_hdr_info *hdr_info; | |
923 | ||
924 | hdr_info = &elf_hash_table (info)->eh_info; | |
ca92cecb RS |
925 | hdr_info->parsed_eh_frames = TRUE; |
926 | } | |
bce613b9 | 927 | |
9d0a14d3 RS |
928 | /* Mark all relocations against CIE or FDE ENT, which occurs in |
929 | .eh_frame section SEC. COOKIE describes the relocations in SEC; | |
930 | its "rel" field can be changed freely. */ | |
931 | ||
932 | static bfd_boolean | |
933 | mark_entry (struct bfd_link_info *info, asection *sec, | |
934 | struct eh_cie_fde *ent, elf_gc_mark_hook_fn gc_mark_hook, | |
935 | struct elf_reloc_cookie *cookie) | |
936 | { | |
5dabe785 | 937 | /* FIXME: octets_per_byte. */ |
9d0a14d3 RS |
938 | for (cookie->rel = cookie->rels + ent->reloc_index; |
939 | cookie->rel < cookie->relend | |
940 | && cookie->rel->r_offset < ent->offset + ent->size; | |
941 | cookie->rel++) | |
942 | if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, cookie)) | |
943 | return FALSE; | |
944 | ||
945 | return TRUE; | |
946 | } | |
947 | ||
948 | /* Mark all the relocations against FDEs that relate to code in input | |
949 | section SEC. The FDEs belong to .eh_frame section EH_FRAME, whose | |
950 | relocations are described by COOKIE. */ | |
951 | ||
952 | bfd_boolean | |
953 | _bfd_elf_gc_mark_fdes (struct bfd_link_info *info, asection *sec, | |
954 | asection *eh_frame, elf_gc_mark_hook_fn gc_mark_hook, | |
955 | struct elf_reloc_cookie *cookie) | |
956 | { | |
184d07da | 957 | struct eh_cie_fde *fde, *cie; |
9d0a14d3 RS |
958 | |
959 | for (fde = elf_fde_list (sec); fde; fde = fde->u.fde.next_for_section) | |
960 | { | |
961 | if (!mark_entry (info, eh_frame, fde, gc_mark_hook, cookie)) | |
962 | return FALSE; | |
963 | ||
964 | /* At this stage, all cie_inf fields point to local CIEs, so we | |
965 | can use the same cookie to refer to them. */ | |
966 | cie = fde->u.fde.cie_inf; | |
184d07da | 967 | if (!cie->u.cie.gc_mark) |
9d0a14d3 | 968 | { |
184d07da | 969 | cie->u.cie.gc_mark = 1; |
9d0a14d3 RS |
970 | if (!mark_entry (info, eh_frame, cie, gc_mark_hook, cookie)) |
971 | return FALSE; | |
972 | } | |
973 | } | |
974 | return TRUE; | |
975 | } | |
976 | ||
184d07da RS |
977 | /* Input section SEC of ABFD is an .eh_frame section that contains the |
978 | CIE described by CIE_INF. Return a version of CIE_INF that is going | |
979 | to be kept in the output, adding CIE_INF to the output if necessary. | |
980 | ||
981 | HDR_INFO is the .eh_frame_hdr information and COOKIE describes the | |
982 | relocations in REL. */ | |
983 | ||
984 | static struct eh_cie_fde * | |
18e04883 | 985 | find_merged_cie (bfd *abfd, struct bfd_link_info *info, asection *sec, |
184d07da RS |
986 | struct eh_frame_hdr_info *hdr_info, |
987 | struct elf_reloc_cookie *cookie, | |
988 | struct eh_cie_fde *cie_inf) | |
989 | { | |
990 | unsigned long r_symndx; | |
991 | struct cie *cie, *new_cie; | |
992 | Elf_Internal_Rela *rel; | |
993 | void **loc; | |
994 | ||
995 | /* Use CIE_INF if we have already decided to keep it. */ | |
996 | if (!cie_inf->removed) | |
997 | return cie_inf; | |
998 | ||
999 | /* If we have merged CIE_INF with another CIE, use that CIE instead. */ | |
1000 | if (cie_inf->u.cie.merged) | |
1001 | return cie_inf->u.cie.u.merged_with; | |
1002 | ||
1003 | cie = cie_inf->u.cie.u.full_cie; | |
1004 | ||
1005 | /* Assume we will need to keep CIE_INF. */ | |
1006 | cie_inf->removed = 0; | |
1007 | cie_inf->u.cie.u.sec = sec; | |
1008 | ||
1009 | /* If we are not merging CIEs, use CIE_INF. */ | |
1010 | if (cie == NULL) | |
1011 | return cie_inf; | |
1012 | ||
1013 | if (cie->per_encoding != DW_EH_PE_omit) | |
1014 | { | |
18e04883 RS |
1015 | bfd_boolean per_binds_local; |
1016 | ||
184d07da RS |
1017 | /* Work out the address of personality routine, either as an absolute |
1018 | value or as a symbol. */ | |
1019 | rel = cookie->rels + cie->personality.reloc_index; | |
1020 | memset (&cie->personality, 0, sizeof (cie->personality)); | |
1021 | #ifdef BFD64 | |
1022 | if (elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64) | |
1023 | r_symndx = ELF64_R_SYM (rel->r_info); | |
1024 | else | |
1025 | #endif | |
1026 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1027 | if (r_symndx >= cookie->locsymcount | |
1028 | || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL) | |
1029 | { | |
1030 | struct elf_link_hash_entry *h; | |
1031 | ||
1032 | r_symndx -= cookie->extsymoff; | |
1033 | h = cookie->sym_hashes[r_symndx]; | |
1034 | ||
1035 | while (h->root.type == bfd_link_hash_indirect | |
1036 | || h->root.type == bfd_link_hash_warning) | |
1037 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1038 | ||
1039 | cie->personality.h = h; | |
18e04883 | 1040 | per_binds_local = SYMBOL_REFERENCES_LOCAL (info, h); |
184d07da RS |
1041 | } |
1042 | else | |
1043 | { | |
1044 | Elf_Internal_Sym *sym; | |
1045 | asection *sym_sec; | |
1046 | ||
1047 | sym = &cookie->locsyms[r_symndx]; | |
1048 | sym_sec = bfd_section_from_elf_index (abfd, sym->st_shndx); | |
1049 | if (sym_sec == NULL) | |
1050 | return cie_inf; | |
1051 | ||
1052 | if (sym_sec->kept_section != NULL) | |
1053 | sym_sec = sym_sec->kept_section; | |
1054 | if (sym_sec->output_section == NULL) | |
1055 | return cie_inf; | |
1056 | ||
1057 | cie->local_personality = 1; | |
1058 | cie->personality.val = (sym->st_value | |
1059 | + sym_sec->output_offset | |
1060 | + sym_sec->output_section->vma); | |
18e04883 RS |
1061 | per_binds_local = TRUE; |
1062 | } | |
1063 | ||
1064 | if (per_binds_local | |
1065 | && info->shared | |
1066 | && (cie->per_encoding & 0x70) == DW_EH_PE_absptr | |
1067 | && (get_elf_backend_data (abfd) | |
1068 | ->elf_backend_can_make_relative_eh_frame (abfd, info, sec))) | |
1069 | { | |
1070 | cie_inf->u.cie.make_per_encoding_relative = 1; | |
1071 | cie_inf->u.cie.per_encoding_relative = 1; | |
184d07da RS |
1072 | } |
1073 | } | |
1074 | ||
1075 | /* See if we can merge this CIE with an earlier one. */ | |
1076 | cie->output_sec = sec->output_section; | |
1077 | cie_compute_hash (cie); | |
1078 | if (hdr_info->cies == NULL) | |
1079 | { | |
1080 | hdr_info->cies = htab_try_create (1, cie_hash, cie_eq, free); | |
1081 | if (hdr_info->cies == NULL) | |
1082 | return cie_inf; | |
1083 | } | |
1084 | loc = htab_find_slot_with_hash (hdr_info->cies, cie, cie->hash, INSERT); | |
1085 | if (loc == NULL) | |
1086 | return cie_inf; | |
1087 | ||
1088 | new_cie = (struct cie *) *loc; | |
1089 | if (new_cie == NULL) | |
1090 | { | |
1091 | /* Keep CIE_INF and record it in the hash table. */ | |
a50b1753 | 1092 | new_cie = (struct cie *) malloc (sizeof (struct cie)); |
184d07da RS |
1093 | if (new_cie == NULL) |
1094 | return cie_inf; | |
1095 | ||
1096 | memcpy (new_cie, cie, sizeof (struct cie)); | |
1097 | *loc = new_cie; | |
1098 | } | |
1099 | else | |
1100 | { | |
1101 | /* Merge CIE_INF with NEW_CIE->CIE_INF. */ | |
1102 | cie_inf->removed = 1; | |
1103 | cie_inf->u.cie.merged = 1; | |
1104 | cie_inf->u.cie.u.merged_with = new_cie->cie_inf; | |
1105 | if (cie_inf->u.cie.make_lsda_relative) | |
1106 | new_cie->cie_inf->u.cie.make_lsda_relative = 1; | |
1107 | } | |
1108 | return new_cie->cie_inf; | |
1109 | } | |
1110 | ||
ca92cecb RS |
1111 | /* This function is called for each input file before the .eh_frame |
1112 | section is relocated. It discards duplicate CIEs and FDEs for discarded | |
1113 | functions. The function returns TRUE iff any entries have been | |
1114 | deleted. */ | |
1115 | ||
1116 | bfd_boolean | |
1117 | _bfd_elf_discard_section_eh_frame | |
1118 | (bfd *abfd, struct bfd_link_info *info, asection *sec, | |
1119 | bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *), | |
1120 | struct elf_reloc_cookie *cookie) | |
1121 | { | |
184d07da | 1122 | struct eh_cie_fde *ent; |
ca92cecb RS |
1123 | struct eh_frame_sec_info *sec_info; |
1124 | struct eh_frame_hdr_info *hdr_info; | |
1125 | unsigned int ptr_size, offset; | |
1126 | ||
1127 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; | |
1128 | if (sec_info == NULL) | |
1129 | return FALSE; | |
1130 | ||
1131 | hdr_info = &elf_hash_table (info)->eh_info; | |
fda3ecf2 | 1132 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
f60e73e9 AM |
1133 | if (ent->size == 4) |
1134 | /* There should only be one zero terminator, on the last input | |
1135 | file supplying .eh_frame (crtend.o). Remove any others. */ | |
1136 | ent->removed = sec->map_head.s != NULL; | |
1137 | else if (!ent->cie) | |
fda3ecf2 | 1138 | { |
ca92cecb | 1139 | cookie->rel = cookie->rels + ent->reloc_index; |
5dabe785 | 1140 | /* FIXME: octets_per_byte. */ |
ca92cecb RS |
1141 | BFD_ASSERT (cookie->rel < cookie->relend |
1142 | && cookie->rel->r_offset == ent->offset + 8); | |
1143 | if (!(*reloc_symbol_deleted_p) (ent->offset + 8, cookie)) | |
bce613b9 | 1144 | { |
ca92cecb | 1145 | if (info->shared |
18e04883 | 1146 | && (((ent->fde_encoding & 0x70) == DW_EH_PE_absptr |
6b2cc140 | 1147 | && ent->make_relative == 0) |
18e04883 | 1148 | || (ent->fde_encoding & 0x70) == DW_EH_PE_aligned)) |
ca92cecb RS |
1149 | { |
1150 | /* If a shared library uses absolute pointers | |
1151 | which we cannot turn into PC relative, | |
1152 | don't create the binary search table, | |
1153 | since it is affected by runtime relocations. */ | |
1154 | hdr_info->table = FALSE; | |
1155 | (*info->callbacks->einfo) | |
1156 | (_("%P: fde encoding in %B(%A) prevents .eh_frame_hdr" | |
1157 | " table being created.\n"), abfd, sec); | |
1158 | } | |
1159 | ent->removed = 0; | |
1160 | hdr_info->fde_count++; | |
18e04883 RS |
1161 | ent->u.fde.cie_inf = find_merged_cie (abfd, info, sec, hdr_info, |
1162 | cookie, ent->u.fde.cie_inf); | |
bce613b9 | 1163 | } |
ca92cecb RS |
1164 | } |
1165 | ||
184d07da RS |
1166 | if (sec_info->cies) |
1167 | { | |
1168 | free (sec_info->cies); | |
1169 | sec_info->cies = NULL; | |
1170 | } | |
1171 | ||
ca92cecb RS |
1172 | ptr_size = (get_elf_backend_data (sec->owner) |
1173 | ->elf_backend_eh_frame_address_size (sec->owner, sec)); | |
1174 | offset = 0; | |
1175 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) | |
1176 | if (!ent->removed) | |
1177 | { | |
353057a5 RS |
1178 | ent->new_offset = offset; |
1179 | offset += size_of_output_cie_fde (ent, ptr_size); | |
fda3ecf2 | 1180 | } |
65765700 | 1181 | |
eea6121a | 1182 | sec->rawsize = sec->size; |
353057a5 | 1183 | sec->size = offset; |
353057a5 | 1184 | return offset != sec->rawsize; |
65765700 JJ |
1185 | } |
1186 | ||
1187 | /* This function is called for .eh_frame_hdr section after | |
1188 | _bfd_elf_discard_section_eh_frame has been called on all .eh_frame | |
1189 | input sections. It finalizes the size of .eh_frame_hdr section. */ | |
1190 | ||
b34976b6 | 1191 | bfd_boolean |
c39a58e6 | 1192 | _bfd_elf_discard_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
65765700 | 1193 | { |
126495ed | 1194 | struct elf_link_hash_table *htab; |
65765700 | 1195 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 1196 | asection *sec; |
65765700 | 1197 | |
126495ed AM |
1198 | htab = elf_hash_table (info); |
1199 | hdr_info = &htab->eh_info; | |
bce613b9 | 1200 | |
184d07da RS |
1201 | if (hdr_info->cies != NULL) |
1202 | { | |
1203 | htab_delete (hdr_info->cies); | |
1204 | hdr_info->cies = NULL; | |
1205 | } | |
1206 | ||
126495ed AM |
1207 | sec = hdr_info->hdr_sec; |
1208 | if (sec == NULL) | |
b34976b6 | 1209 | return FALSE; |
126495ed | 1210 | |
eea6121a | 1211 | sec->size = EH_FRAME_HDR_SIZE; |
65765700 | 1212 | if (hdr_info->table) |
eea6121a | 1213 | sec->size += 4 + hdr_info->fde_count * 8; |
65765700 | 1214 | |
126495ed | 1215 | elf_tdata (abfd)->eh_frame_hdr = sec; |
b34976b6 | 1216 | return TRUE; |
65765700 JJ |
1217 | } |
1218 | ||
68f69152 JJ |
1219 | /* This function is called from size_dynamic_sections. |
1220 | It needs to decide whether .eh_frame_hdr should be output or not, | |
8423293d AM |
1221 | because when the dynamic symbol table has been sized it is too late |
1222 | to strip sections. */ | |
68f69152 | 1223 | |
b34976b6 | 1224 | bfd_boolean |
c39a58e6 | 1225 | _bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info) |
68f69152 | 1226 | { |
126495ed | 1227 | asection *o; |
68f69152 | 1228 | bfd *abfd; |
126495ed | 1229 | struct elf_link_hash_table *htab; |
68f69152 JJ |
1230 | struct eh_frame_hdr_info *hdr_info; |
1231 | ||
126495ed AM |
1232 | htab = elf_hash_table (info); |
1233 | hdr_info = &htab->eh_info; | |
1234 | if (hdr_info->hdr_sec == NULL) | |
b34976b6 | 1235 | return TRUE; |
68f69152 | 1236 | |
126495ed AM |
1237 | if (bfd_is_abs_section (hdr_info->hdr_sec->output_section)) |
1238 | { | |
1239 | hdr_info->hdr_sec = NULL; | |
b34976b6 | 1240 | return TRUE; |
126495ed | 1241 | } |
68f69152 JJ |
1242 | |
1243 | abfd = NULL; | |
1244 | if (info->eh_frame_hdr) | |
1245 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) | |
1246 | { | |
1247 | /* Count only sections which have at least a single CIE or FDE. | |
1248 | There cannot be any CIE or FDE <= 8 bytes. */ | |
1249 | o = bfd_get_section_by_name (abfd, ".eh_frame"); | |
eea6121a | 1250 | if (o && o->size > 8 && !bfd_is_abs_section (o->output_section)) |
68f69152 JJ |
1251 | break; |
1252 | } | |
1253 | ||
1254 | if (abfd == NULL) | |
1255 | { | |
8423293d | 1256 | hdr_info->hdr_sec->flags |= SEC_EXCLUDE; |
126495ed | 1257 | hdr_info->hdr_sec = NULL; |
b34976b6 | 1258 | return TRUE; |
68f69152 | 1259 | } |
126495ed | 1260 | |
b34976b6 AM |
1261 | hdr_info->table = TRUE; |
1262 | return TRUE; | |
68f69152 JJ |
1263 | } |
1264 | ||
65765700 JJ |
1265 | /* Adjust an address in the .eh_frame section. Given OFFSET within |
1266 | SEC, this returns the new offset in the adjusted .eh_frame section, | |
1267 | or -1 if the address refers to a CIE/FDE which has been removed | |
1268 | or to offset with dynamic relocation which is no longer needed. */ | |
1269 | ||
1270 | bfd_vma | |
c39a58e6 | 1271 | _bfd_elf_eh_frame_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, |
92e4ec35 | 1272 | struct bfd_link_info *info, |
c39a58e6 AM |
1273 | asection *sec, |
1274 | bfd_vma offset) | |
65765700 JJ |
1275 | { |
1276 | struct eh_frame_sec_info *sec_info; | |
92e4ec35 AM |
1277 | struct elf_link_hash_table *htab; |
1278 | struct eh_frame_hdr_info *hdr_info; | |
65765700 JJ |
1279 | unsigned int lo, hi, mid; |
1280 | ||
68bfbfcc | 1281 | if (sec->sec_info_type != ELF_INFO_TYPE_EH_FRAME) |
65765700 | 1282 | return offset; |
a50b1753 | 1283 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
65765700 | 1284 | |
eea6121a AM |
1285 | if (offset >= sec->rawsize) |
1286 | return offset - sec->rawsize + sec->size; | |
65765700 | 1287 | |
92e4ec35 AM |
1288 | htab = elf_hash_table (info); |
1289 | hdr_info = &htab->eh_info; | |
92e4ec35 | 1290 | |
65765700 JJ |
1291 | lo = 0; |
1292 | hi = sec_info->count; | |
1293 | mid = 0; | |
1294 | while (lo < hi) | |
1295 | { | |
1296 | mid = (lo + hi) / 2; | |
1297 | if (offset < sec_info->entry[mid].offset) | |
1298 | hi = mid; | |
1299 | else if (offset | |
1300 | >= sec_info->entry[mid].offset + sec_info->entry[mid].size) | |
1301 | lo = mid + 1; | |
1302 | else | |
1303 | break; | |
1304 | } | |
1305 | ||
1306 | BFD_ASSERT (lo < hi); | |
1307 | ||
1308 | /* FDE or CIE was removed. */ | |
1309 | if (sec_info->entry[mid].removed) | |
1310 | return (bfd_vma) -1; | |
1311 | ||
18e04883 RS |
1312 | /* If converting personality pointers to DW_EH_PE_pcrel, there will be |
1313 | no need for run-time relocation against the personality field. */ | |
1314 | if (sec_info->entry[mid].cie | |
1315 | && sec_info->entry[mid].u.cie.make_per_encoding_relative | |
1316 | && offset == (sec_info->entry[mid].offset + 8 | |
1317 | + sec_info->entry[mid].u.cie.personality_offset)) | |
1318 | return (bfd_vma) -2; | |
1319 | ||
65765700 JJ |
1320 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1321 | relocation against FDE's initial_location field. */ | |
fda3ecf2 | 1322 | if (!sec_info->entry[mid].cie |
6b2cc140 | 1323 | && sec_info->entry[mid].make_relative |
353057a5 RS |
1324 | && offset == sec_info->entry[mid].offset + 8) |
1325 | return (bfd_vma) -2; | |
65765700 | 1326 | |
9e2a4898 JJ |
1327 | /* If converting LSDA pointers to DW_EH_PE_pcrel, there will be no need |
1328 | for run-time relocation against LSDA field. */ | |
fda3ecf2 | 1329 | if (!sec_info->entry[mid].cie |
9f4b847e RS |
1330 | && sec_info->entry[mid].u.fde.cie_inf->u.cie.make_lsda_relative |
1331 | && offset == (sec_info->entry[mid].offset + 8 | |
1332 | + sec_info->entry[mid].lsda_offset)) | |
1333 | return (bfd_vma) -2; | |
9e2a4898 | 1334 | |
ac685e6a JJ |
1335 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1336 | relocation against DW_CFA_set_loc's arguments. */ | |
1337 | if (sec_info->entry[mid].set_loc | |
6b2cc140 | 1338 | && sec_info->entry[mid].make_relative |
ac685e6a JJ |
1339 | && (offset >= sec_info->entry[mid].offset + 8 |
1340 | + sec_info->entry[mid].set_loc[1])) | |
1341 | { | |
1342 | unsigned int cnt; | |
1343 | ||
1344 | for (cnt = 1; cnt <= sec_info->entry[mid].set_loc[0]; cnt++) | |
1345 | if (offset == sec_info->entry[mid].offset + 8 | |
1346 | + sec_info->entry[mid].set_loc[cnt]) | |
1347 | return (bfd_vma) -2; | |
1348 | } | |
1349 | ||
353057a5 | 1350 | /* Any new augmentation bytes go before the first relocation. */ |
c68836a9 | 1351 | return (offset + sec_info->entry[mid].new_offset |
353057a5 RS |
1352 | - sec_info->entry[mid].offset |
1353 | + extra_augmentation_string_bytes (sec_info->entry + mid) | |
1354 | + extra_augmentation_data_bytes (sec_info->entry + mid)); | |
65765700 JJ |
1355 | } |
1356 | ||
1357 | /* Write out .eh_frame section. This is called with the relocated | |
1358 | contents. */ | |
1359 | ||
b34976b6 | 1360 | bfd_boolean |
c39a58e6 AM |
1361 | _bfd_elf_write_section_eh_frame (bfd *abfd, |
1362 | struct bfd_link_info *info, | |
1363 | asection *sec, | |
1364 | bfd_byte *contents) | |
65765700 JJ |
1365 | { |
1366 | struct eh_frame_sec_info *sec_info; | |
126495ed | 1367 | struct elf_link_hash_table *htab; |
65765700 | 1368 | struct eh_frame_hdr_info *hdr_info; |
65765700 | 1369 | unsigned int ptr_size; |
fda3ecf2 | 1370 | struct eh_cie_fde *ent; |
65765700 | 1371 | |
68bfbfcc | 1372 | if (sec->sec_info_type != ELF_INFO_TYPE_EH_FRAME) |
5dabe785 | 1373 | /* FIXME: octets_per_byte. */ |
c39a58e6 | 1374 | return bfd_set_section_contents (abfd, sec->output_section, contents, |
eea6121a | 1375 | sec->output_offset, sec->size); |
8c946ed5 RS |
1376 | |
1377 | ptr_size = (get_elf_backend_data (abfd) | |
1378 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
1379 | BFD_ASSERT (ptr_size != 0); | |
1380 | ||
a50b1753 | 1381 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
126495ed AM |
1382 | htab = elf_hash_table (info); |
1383 | hdr_info = &htab->eh_info; | |
3472e2e9 | 1384 | |
126495ed | 1385 | if (hdr_info->table && hdr_info->array == NULL) |
a50b1753 NC |
1386 | hdr_info->array = (struct eh_frame_array_ent *) |
1387 | bfd_malloc (hdr_info->fde_count * sizeof(*hdr_info->array)); | |
126495ed AM |
1388 | if (hdr_info->array == NULL) |
1389 | hdr_info = NULL; | |
65765700 | 1390 | |
353057a5 RS |
1391 | /* The new offsets can be bigger or smaller than the original offsets. |
1392 | We therefore need to make two passes over the section: one backward | |
1393 | pass to move entries up and one forward pass to move entries down. | |
1394 | The two passes won't interfere with each other because entries are | |
1395 | not reordered */ | |
1396 | for (ent = sec_info->entry + sec_info->count; ent-- != sec_info->entry;) | |
1397 | if (!ent->removed && ent->new_offset > ent->offset) | |
fc802241 | 1398 | memmove (contents + ent->new_offset, contents + ent->offset, ent->size); |
353057a5 RS |
1399 | |
1400 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) | |
1401 | if (!ent->removed && ent->new_offset < ent->offset) | |
fc802241 | 1402 | memmove (contents + ent->new_offset, contents + ent->offset, ent->size); |
353057a5 | 1403 | |
fda3ecf2 | 1404 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
65765700 | 1405 | { |
353057a5 RS |
1406 | unsigned char *buf, *end; |
1407 | unsigned int new_size; | |
1408 | ||
fda3ecf2 AM |
1409 | if (ent->removed) |
1410 | continue; | |
1411 | ||
353057a5 RS |
1412 | if (ent->size == 4) |
1413 | { | |
1414 | /* Any terminating FDE must be at the end of the section. */ | |
1415 | BFD_ASSERT (ent == sec_info->entry + sec_info->count - 1); | |
1416 | continue; | |
1417 | } | |
1418 | ||
fc802241 | 1419 | buf = contents + ent->new_offset; |
353057a5 RS |
1420 | end = buf + ent->size; |
1421 | new_size = size_of_output_cie_fde (ent, ptr_size); | |
1422 | ||
a34a056a L |
1423 | /* Update the size. It may be shrinked. */ |
1424 | bfd_put_32 (abfd, new_size - 4, buf); | |
1425 | ||
1426 | /* Filling the extra bytes with DW_CFA_nops. */ | |
353057a5 | 1427 | if (new_size != ent->size) |
a34a056a | 1428 | memset (end, 0, new_size - ent->size); |
353057a5 | 1429 | |
fda3ecf2 | 1430 | if (ent->cie) |
65765700 JJ |
1431 | { |
1432 | /* CIE */ | |
353057a5 | 1433 | if (ent->make_relative |
9f4b847e | 1434 | || ent->u.cie.make_lsda_relative |
6b2cc140 | 1435 | || ent->u.cie.per_encoding_relative) |
65765700 | 1436 | { |
f075ee0c | 1437 | char *aug; |
353057a5 | 1438 | unsigned int action, extra_string, extra_data; |
2c42be65 | 1439 | unsigned int per_width, per_encoding; |
65765700 | 1440 | |
9e2a4898 | 1441 | /* Need to find 'R' or 'L' augmentation's argument and modify |
65765700 | 1442 | DW_EH_PE_* value. */ |
353057a5 | 1443 | action = ((ent->make_relative ? 1 : 0) |
9f4b847e | 1444 | | (ent->u.cie.make_lsda_relative ? 2 : 0) |
6b2cc140 | 1445 | | (ent->u.cie.per_encoding_relative ? 4 : 0)); |
353057a5 RS |
1446 | extra_string = extra_augmentation_string_bytes (ent); |
1447 | extra_data = extra_augmentation_data_bytes (ent); | |
1448 | ||
65765700 JJ |
1449 | /* Skip length, id and version. */ |
1450 | buf += 9; | |
f075ee0c AM |
1451 | aug = (char *) buf; |
1452 | buf += strlen (aug) + 1; | |
2c42be65 RS |
1453 | skip_leb128 (&buf, end); |
1454 | skip_leb128 (&buf, end); | |
1455 | skip_leb128 (&buf, end); | |
65765700 JJ |
1456 | if (*aug == 'z') |
1457 | { | |
353057a5 RS |
1458 | /* The uleb128 will always be a single byte for the kind |
1459 | of augmentation strings that we're prepared to handle. */ | |
1460 | *buf++ += extra_data; | |
65765700 JJ |
1461 | aug++; |
1462 | } | |
1463 | ||
353057a5 RS |
1464 | /* Make room for the new augmentation string and data bytes. */ |
1465 | memmove (buf + extra_string + extra_data, buf, end - buf); | |
f075ee0c | 1466 | memmove (aug + extra_string, aug, buf - (bfd_byte *) aug); |
353057a5 | 1467 | buf += extra_string; |
2c42be65 | 1468 | end += extra_string + extra_data; |
353057a5 RS |
1469 | |
1470 | if (ent->add_augmentation_size) | |
1471 | { | |
1472 | *aug++ = 'z'; | |
1473 | *buf++ = extra_data - 1; | |
1474 | } | |
6b2cc140 | 1475 | if (ent->u.cie.add_fde_encoding) |
353057a5 RS |
1476 | { |
1477 | BFD_ASSERT (action & 1); | |
1478 | *aug++ = 'R'; | |
30af5962 | 1479 | *buf++ = make_pc_relative (DW_EH_PE_absptr, ptr_size); |
353057a5 RS |
1480 | action &= ~1; |
1481 | } | |
1482 | ||
9e2a4898 | 1483 | while (action) |
65765700 JJ |
1484 | switch (*aug++) |
1485 | { | |
1486 | case 'L': | |
9e2a4898 JJ |
1487 | if (action & 2) |
1488 | { | |
fda3ecf2 | 1489 | BFD_ASSERT (*buf == ent->lsda_encoding); |
30af5962 | 1490 | *buf = make_pc_relative (*buf, ptr_size); |
9e2a4898 JJ |
1491 | action &= ~2; |
1492 | } | |
65765700 JJ |
1493 | buf++; |
1494 | break; | |
1495 | case 'P': | |
18e04883 | 1496 | if (ent->u.cie.make_per_encoding_relative) |
a10917ef | 1497 | *buf = make_pc_relative (*buf, ptr_size); |
65765700 | 1498 | per_encoding = *buf++; |
3472e2e9 | 1499 | per_width = get_DW_EH_PE_width (per_encoding, ptr_size); |
65765700 | 1500 | BFD_ASSERT (per_width != 0); |
09ae86c2 | 1501 | BFD_ASSERT (((per_encoding & 0x70) == DW_EH_PE_pcrel) |
6b2cc140 | 1502 | == ent->u.cie.per_encoding_relative); |
18e04883 | 1503 | if ((per_encoding & 0x70) == DW_EH_PE_aligned) |
65765700 JJ |
1504 | buf = (contents |
1505 | + ((buf - contents + per_width - 1) | |
1506 | & ~((bfd_size_type) per_width - 1))); | |
09ae86c2 JJ |
1507 | if (action & 4) |
1508 | { | |
fda3ecf2 AM |
1509 | bfd_vma val; |
1510 | ||
1511 | val = read_value (abfd, buf, per_width, | |
1512 | get_DW_EH_PE_signed (per_encoding)); | |
18e04883 RS |
1513 | if (ent->u.cie.make_per_encoding_relative) |
1514 | val -= (sec->output_section->vma | |
1515 | + sec->output_offset | |
1516 | + (buf - contents)); | |
1517 | else | |
1518 | { | |
1519 | val += (bfd_vma) ent->offset - ent->new_offset; | |
1520 | val -= extra_string + extra_data; | |
1521 | } | |
fda3ecf2 | 1522 | write_value (abfd, buf, val, per_width); |
09ae86c2 JJ |
1523 | action &= ~4; |
1524 | } | |
65765700 JJ |
1525 | buf += per_width; |
1526 | break; | |
9e2a4898 JJ |
1527 | case 'R': |
1528 | if (action & 1) | |
1529 | { | |
fda3ecf2 | 1530 | BFD_ASSERT (*buf == ent->fde_encoding); |
30af5962 | 1531 | *buf = make_pc_relative (*buf, ptr_size); |
9e2a4898 JJ |
1532 | action &= ~1; |
1533 | } | |
1534 | buf++; | |
1535 | break; | |
63752a75 JJ |
1536 | case 'S': |
1537 | break; | |
65765700 JJ |
1538 | default: |
1539 | BFD_FAIL (); | |
1540 | } | |
65765700 JJ |
1541 | } |
1542 | } | |
353057a5 | 1543 | else |
65765700 JJ |
1544 | { |
1545 | /* FDE */ | |
fda3ecf2 | 1546 | bfd_vma value, address; |
9e2a4898 | 1547 | unsigned int width; |
ac685e6a | 1548 | bfd_byte *start; |
155eaaa0 | 1549 | struct eh_cie_fde *cie; |
65765700 | 1550 | |
b34976b6 | 1551 | /* Skip length. */ |
155eaaa0 | 1552 | cie = ent->u.fde.cie_inf; |
65765700 | 1553 | buf += 4; |
fc802241 RS |
1554 | value = ((ent->new_offset + sec->output_offset + 4) |
1555 | - (cie->new_offset + cie->u.cie.u.sec->output_offset)); | |
fda3ecf2 | 1556 | bfd_put_32 (abfd, value, buf); |
65765700 | 1557 | buf += 4; |
fda3ecf2 AM |
1558 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); |
1559 | value = read_value (abfd, buf, width, | |
1560 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
1561 | address = value; | |
9e2a4898 | 1562 | if (value) |
65765700 | 1563 | { |
18e04883 | 1564 | switch (ent->fde_encoding & 0x70) |
9e2a4898 | 1565 | { |
9e2a4898 JJ |
1566 | case DW_EH_PE_textrel: |
1567 | BFD_ASSERT (hdr_info == NULL); | |
1568 | break; | |
1569 | case DW_EH_PE_datarel: | |
1570 | { | |
1571 | asection *got = bfd_get_section_by_name (abfd, ".got"); | |
1572 | ||
1573 | BFD_ASSERT (got != NULL); | |
1574 | address += got->vma; | |
1575 | } | |
1576 | break; | |
1577 | case DW_EH_PE_pcrel: | |
9c47c4c1 | 1578 | value += (bfd_vma) ent->offset - ent->new_offset; |
fc802241 RS |
1579 | address += (sec->output_section->vma |
1580 | + sec->output_offset | |
1581 | + ent->offset + 8); | |
9e2a4898 JJ |
1582 | break; |
1583 | } | |
6b2cc140 | 1584 | if (ent->make_relative) |
fc802241 RS |
1585 | value -= (sec->output_section->vma |
1586 | + sec->output_offset | |
1587 | + ent->new_offset + 8); | |
9e2a4898 | 1588 | write_value (abfd, buf, value, width); |
65765700 JJ |
1589 | } |
1590 | ||
ac685e6a JJ |
1591 | start = buf; |
1592 | ||
65765700 JJ |
1593 | if (hdr_info) |
1594 | { | |
1595 | hdr_info->array[hdr_info->array_count].initial_loc = address; | |
1596 | hdr_info->array[hdr_info->array_count++].fde | |
fc802241 RS |
1597 | = (sec->output_section->vma |
1598 | + sec->output_offset | |
1599 | + ent->new_offset); | |
65765700 | 1600 | } |
9e2a4898 | 1601 | |
18e04883 | 1602 | if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel |
9f4b847e | 1603 | || cie->u.cie.make_lsda_relative) |
9e2a4898 | 1604 | { |
fda3ecf2 AM |
1605 | buf += ent->lsda_offset; |
1606 | width = get_DW_EH_PE_width (ent->lsda_encoding, ptr_size); | |
84f97cb6 | 1607 | value = read_value (abfd, buf, width, |
fda3ecf2 | 1608 | get_DW_EH_PE_signed (ent->lsda_encoding)); |
9e2a4898 JJ |
1609 | if (value) |
1610 | { | |
18e04883 | 1611 | if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel) |
9c47c4c1 | 1612 | value += (bfd_vma) ent->offset - ent->new_offset; |
9f4b847e | 1613 | else if (cie->u.cie.make_lsda_relative) |
fc802241 RS |
1614 | value -= (sec->output_section->vma |
1615 | + sec->output_offset | |
1616 | + ent->new_offset + 8 + ent->lsda_offset); | |
9e2a4898 JJ |
1617 | write_value (abfd, buf, value, width); |
1618 | } | |
1619 | } | |
6b2cc140 | 1620 | else if (ent->add_augmentation_size) |
353057a5 RS |
1621 | { |
1622 | /* Skip the PC and length and insert a zero byte for the | |
1623 | augmentation size. */ | |
1624 | buf += width * 2; | |
1625 | memmove (buf + 1, buf, end - buf); | |
1626 | *buf = 0; | |
1627 | } | |
ac685e6a JJ |
1628 | |
1629 | if (ent->set_loc) | |
1630 | { | |
1631 | /* Adjust DW_CFA_set_loc. */ | |
91d6fa6a | 1632 | unsigned int cnt; |
ac685e6a JJ |
1633 | bfd_vma new_offset; |
1634 | ||
1635 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1636 | new_offset = ent->new_offset + 8 | |
1637 | + extra_augmentation_string_bytes (ent) | |
1638 | + extra_augmentation_data_bytes (ent); | |
1639 | ||
1640 | for (cnt = 1; cnt <= ent->set_loc[0]; cnt++) | |
1641 | { | |
ac685e6a JJ |
1642 | buf = start + ent->set_loc[cnt]; |
1643 | ||
1644 | value = read_value (abfd, buf, width, | |
1645 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
1646 | if (!value) | |
1647 | continue; | |
1648 | ||
18e04883 | 1649 | if ((ent->fde_encoding & 0x70) == DW_EH_PE_pcrel) |
9c47c4c1 | 1650 | value += (bfd_vma) ent->offset + 8 - new_offset; |
6b2cc140 | 1651 | if (ent->make_relative) |
fc802241 RS |
1652 | value -= (sec->output_section->vma |
1653 | + sec->output_offset | |
1654 | + new_offset + ent->set_loc[cnt]); | |
ac685e6a JJ |
1655 | write_value (abfd, buf, value, width); |
1656 | } | |
1657 | } | |
65765700 | 1658 | } |
65765700 JJ |
1659 | } |
1660 | ||
a34a056a L |
1661 | /* We don't align the section to its section alignment since the |
1662 | runtime library only expects all CIE/FDE records aligned at | |
4e591bc1 | 1663 | the pointer size. _bfd_elf_discard_section_eh_frame should |
a34a056a L |
1664 | have padded CIE/FDE records to multiple of pointer size with |
1665 | size_of_output_cie_fde. */ | |
1666 | if ((sec->size % ptr_size) != 0) | |
1667 | abort (); | |
a5eb27e6 | 1668 | |
5dabe785 | 1669 | /* FIXME: octets_per_byte. */ |
65765700 | 1670 | return bfd_set_section_contents (abfd, sec->output_section, |
3472e2e9 AM |
1671 | contents, (file_ptr) sec->output_offset, |
1672 | sec->size); | |
65765700 JJ |
1673 | } |
1674 | ||
1675 | /* Helper function used to sort .eh_frame_hdr search table by increasing | |
1676 | VMA of FDE initial location. */ | |
1677 | ||
1678 | static int | |
c39a58e6 | 1679 | vma_compare (const void *a, const void *b) |
65765700 | 1680 | { |
a50b1753 NC |
1681 | const struct eh_frame_array_ent *p = (const struct eh_frame_array_ent *) a; |
1682 | const struct eh_frame_array_ent *q = (const struct eh_frame_array_ent *) b; | |
65765700 JJ |
1683 | if (p->initial_loc > q->initial_loc) |
1684 | return 1; | |
1685 | if (p->initial_loc < q->initial_loc) | |
1686 | return -1; | |
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | /* Write out .eh_frame_hdr section. This must be called after | |
1691 | _bfd_elf_write_section_eh_frame has been called on all input | |
1692 | .eh_frame sections. | |
1693 | .eh_frame_hdr format: | |
1694 | ubyte version (currently 1) | |
1695 | ubyte eh_frame_ptr_enc (DW_EH_PE_* encoding of pointer to start of | |
1696 | .eh_frame section) | |
1697 | ubyte fde_count_enc (DW_EH_PE_* encoding of total FDE count | |
1698 | number (or DW_EH_PE_omit if there is no | |
1699 | binary search table computed)) | |
1700 | ubyte table_enc (DW_EH_PE_* encoding of binary search table, | |
1701 | or DW_EH_PE_omit if not present. | |
1702 | DW_EH_PE_datarel is using address of | |
1703 | .eh_frame_hdr section start as base) | |
1704 | [encoded] eh_frame_ptr (pointer to start of .eh_frame section) | |
1705 | optionally followed by: | |
1706 | [encoded] fde_count (total number of FDEs in .eh_frame section) | |
1707 | fde_count x [encoded] initial_loc, fde | |
1708 | (array of encoded pairs containing | |
1709 | FDE initial_location field and FDE address, | |
5ed6aba4 | 1710 | sorted by increasing initial_loc). */ |
65765700 | 1711 | |
b34976b6 | 1712 | bfd_boolean |
c39a58e6 | 1713 | _bfd_elf_write_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
65765700 | 1714 | { |
126495ed | 1715 | struct elf_link_hash_table *htab; |
65765700 | 1716 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 1717 | asection *sec; |
65765700 JJ |
1718 | bfd_byte *contents; |
1719 | asection *eh_frame_sec; | |
1720 | bfd_size_type size; | |
5ed6aba4 | 1721 | bfd_boolean retval; |
ec3391e7 | 1722 | bfd_vma encoded_eh_frame; |
65765700 | 1723 | |
126495ed AM |
1724 | htab = elf_hash_table (info); |
1725 | hdr_info = &htab->eh_info; | |
1726 | sec = hdr_info->hdr_sec; | |
1727 | if (sec == NULL) | |
b34976b6 | 1728 | return TRUE; |
57a72197 | 1729 | |
65765700 JJ |
1730 | size = EH_FRAME_HDR_SIZE; |
1731 | if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) | |
1732 | size += 4 + hdr_info->fde_count * 8; | |
a50b1753 | 1733 | contents = (bfd_byte *) bfd_malloc (size); |
65765700 | 1734 | if (contents == NULL) |
b34976b6 | 1735 | return FALSE; |
65765700 JJ |
1736 | |
1737 | eh_frame_sec = bfd_get_section_by_name (abfd, ".eh_frame"); | |
1738 | if (eh_frame_sec == NULL) | |
5ed6aba4 NC |
1739 | { |
1740 | free (contents); | |
1741 | return FALSE; | |
1742 | } | |
65765700 JJ |
1743 | |
1744 | memset (contents, 0, EH_FRAME_HDR_SIZE); | |
5ed6aba4 | 1745 | contents[0] = 1; /* Version. */ |
ec3391e7 AO |
1746 | contents[1] = get_elf_backend_data (abfd)->elf_backend_encode_eh_address |
1747 | (abfd, info, eh_frame_sec, 0, sec, 4, | |
1748 | &encoded_eh_frame); /* .eh_frame offset. */ | |
1749 | ||
65765700 JJ |
1750 | if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) |
1751 | { | |
5ed6aba4 NC |
1752 | contents[2] = DW_EH_PE_udata4; /* FDE count encoding. */ |
1753 | contents[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4; /* Search table enc. */ | |
65765700 JJ |
1754 | } |
1755 | else | |
1756 | { | |
1757 | contents[2] = DW_EH_PE_omit; | |
1758 | contents[3] = DW_EH_PE_omit; | |
1759 | } | |
ec3391e7 AO |
1760 | bfd_put_32 (abfd, encoded_eh_frame, contents + 4); |
1761 | ||
65765700 JJ |
1762 | if (contents[2] != DW_EH_PE_omit) |
1763 | { | |
1764 | unsigned int i; | |
1765 | ||
1766 | bfd_put_32 (abfd, hdr_info->fde_count, contents + EH_FRAME_HDR_SIZE); | |
1767 | qsort (hdr_info->array, hdr_info->fde_count, sizeof (*hdr_info->array), | |
1768 | vma_compare); | |
1769 | for (i = 0; i < hdr_info->fde_count; i++) | |
1770 | { | |
1771 | bfd_put_32 (abfd, | |
1772 | hdr_info->array[i].initial_loc | |
1773 | - sec->output_section->vma, | |
1774 | contents + EH_FRAME_HDR_SIZE + i * 8 + 4); | |
1775 | bfd_put_32 (abfd, | |
1776 | hdr_info->array[i].fde - sec->output_section->vma, | |
1777 | contents + EH_FRAME_HDR_SIZE + i * 8 + 8); | |
1778 | } | |
1779 | } | |
1780 | ||
5dabe785 | 1781 | /* FIXME: octets_per_byte. */ |
5ed6aba4 NC |
1782 | retval = bfd_set_section_contents (abfd, sec->output_section, |
1783 | contents, (file_ptr) sec->output_offset, | |
eea6121a | 1784 | sec->size); |
5ed6aba4 NC |
1785 | free (contents); |
1786 | return retval; | |
65765700 | 1787 | } |
ec3391e7 | 1788 | |
8c946ed5 RS |
1789 | /* Return the width of FDE addresses. This is the default implementation. */ |
1790 | ||
1791 | unsigned int | |
1792 | _bfd_elf_eh_frame_address_size (bfd *abfd, asection *sec ATTRIBUTE_UNUSED) | |
1793 | { | |
1794 | return elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64 ? 8 : 4; | |
1795 | } | |
1796 | ||
ec3391e7 AO |
1797 | /* Decide whether we can use a PC-relative encoding within the given |
1798 | EH frame section. This is the default implementation. */ | |
1799 | ||
1800 | bfd_boolean | |
1801 | _bfd_elf_can_make_relative (bfd *input_bfd ATTRIBUTE_UNUSED, | |
1802 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
1803 | asection *eh_frame_section ATTRIBUTE_UNUSED) | |
1804 | { | |
1805 | return TRUE; | |
1806 | } | |
1807 | ||
1808 | /* Select an encoding for the given address. Preference is given to | |
1809 | PC-relative addressing modes. */ | |
1810 | ||
1811 | bfd_byte | |
1812 | _bfd_elf_encode_eh_address (bfd *abfd ATTRIBUTE_UNUSED, | |
1813 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
1814 | asection *osec, bfd_vma offset, | |
1815 | asection *loc_sec, bfd_vma loc_offset, | |
1816 | bfd_vma *encoded) | |
1817 | { | |
1818 | *encoded = osec->vma + offset - | |
1819 | (loc_sec->output_section->vma + loc_sec->output_offset + loc_offset); | |
1820 | return DW_EH_PE_pcrel | DW_EH_PE_sdata4; | |
1821 | } |