Commit | Line | Data |
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65765700 | 1 | /* .eh_frame section optimization. |
dbaa2011 AM |
2 | Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, |
3 | 2012 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 |
99d190fa | 238 | && c1->initial_insn_length <= sizeof (c1->initial_instructions) |
65765700 JJ |
239 | && memcmp (c1->initial_instructions, |
240 | c2->initial_instructions, | |
241 | c1->initial_insn_length) == 0) | |
bce613b9 | 242 | return 1; |
65765700 | 243 | |
bce613b9 JJ |
244 | return 0; |
245 | } | |
246 | ||
247 | static hashval_t | |
248 | cie_hash (const void *e) | |
249 | { | |
a50b1753 | 250 | const struct cie *c = (const struct cie *) e; |
bce613b9 JJ |
251 | return c->hash; |
252 | } | |
253 | ||
254 | static hashval_t | |
255 | cie_compute_hash (struct cie *c) | |
256 | { | |
257 | hashval_t h = 0; | |
99d190fa | 258 | size_t len; |
bce613b9 JJ |
259 | h = iterative_hash_object (c->length, h); |
260 | h = iterative_hash_object (c->version, h); | |
261 | h = iterative_hash (c->augmentation, strlen (c->augmentation) + 1, h); | |
262 | h = iterative_hash_object (c->code_align, h); | |
263 | h = iterative_hash_object (c->data_align, h); | |
264 | h = iterative_hash_object (c->ra_column, h); | |
265 | h = iterative_hash_object (c->augmentation_size, h); | |
266 | h = iterative_hash_object (c->personality, h); | |
267 | h = iterative_hash_object (c->output_sec, h); | |
268 | h = iterative_hash_object (c->per_encoding, h); | |
269 | h = iterative_hash_object (c->lsda_encoding, h); | |
270 | h = iterative_hash_object (c->fde_encoding, h); | |
271 | h = iterative_hash_object (c->initial_insn_length, h); | |
99d190fa AM |
272 | len = c->initial_insn_length; |
273 | if (len > sizeof (c->initial_instructions)) | |
274 | len = sizeof (c->initial_instructions); | |
275 | h = iterative_hash (c->initial_instructions, len, h); | |
bce613b9 JJ |
276 | c->hash = h; |
277 | return h; | |
65765700 JJ |
278 | } |
279 | ||
353057a5 RS |
280 | /* Return the number of extra bytes that we'll be inserting into |
281 | ENTRY's augmentation string. */ | |
282 | ||
283 | static INLINE unsigned int | |
284 | extra_augmentation_string_bytes (struct eh_cie_fde *entry) | |
285 | { | |
286 | unsigned int size = 0; | |
287 | if (entry->cie) | |
288 | { | |
289 | if (entry->add_augmentation_size) | |
290 | size++; | |
6b2cc140 | 291 | if (entry->u.cie.add_fde_encoding) |
353057a5 RS |
292 | size++; |
293 | } | |
294 | return size; | |
295 | } | |
296 | ||
297 | /* Likewise ENTRY's augmentation data. */ | |
298 | ||
299 | static INLINE unsigned int | |
300 | extra_augmentation_data_bytes (struct eh_cie_fde *entry) | |
301 | { | |
302 | unsigned int size = 0; | |
6b2cc140 RS |
303 | if (entry->add_augmentation_size) |
304 | size++; | |
305 | if (entry->cie && entry->u.cie.add_fde_encoding) | |
306 | size++; | |
353057a5 RS |
307 | return size; |
308 | } | |
309 | ||
310 | /* Return the size that ENTRY will have in the output. ALIGNMENT is the | |
311 | required alignment of ENTRY in bytes. */ | |
312 | ||
313 | static unsigned int | |
314 | size_of_output_cie_fde (struct eh_cie_fde *entry, unsigned int alignment) | |
315 | { | |
316 | if (entry->removed) | |
317 | return 0; | |
318 | if (entry->size == 4) | |
319 | return 4; | |
320 | return (entry->size | |
321 | + extra_augmentation_string_bytes (entry) | |
322 | + extra_augmentation_data_bytes (entry) | |
323 | + alignment - 1) & -alignment; | |
324 | } | |
325 | ||
dcf507a6 RS |
326 | /* Assume that the bytes between *ITER and END are CFA instructions. |
327 | Try to move *ITER past the first instruction and return true on | |
328 | success. ENCODED_PTR_WIDTH gives the width of pointer entries. */ | |
329 | ||
330 | static bfd_boolean | |
331 | skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) | |
332 | { | |
333 | bfd_byte op; | |
334 | bfd_vma length; | |
335 | ||
336 | if (!read_byte (iter, end, &op)) | |
337 | return FALSE; | |
338 | ||
ac685e6a | 339 | switch (op & 0xc0 ? op & 0xc0 : op) |
dcf507a6 RS |
340 | { |
341 | case DW_CFA_nop: | |
342 | case DW_CFA_advance_loc: | |
343 | case DW_CFA_restore: | |
ac685e6a JJ |
344 | case DW_CFA_remember_state: |
345 | case DW_CFA_restore_state: | |
346 | case DW_CFA_GNU_window_save: | |
dcf507a6 RS |
347 | /* No arguments. */ |
348 | return TRUE; | |
349 | ||
350 | case DW_CFA_offset: | |
351 | case DW_CFA_restore_extended: | |
352 | case DW_CFA_undefined: | |
353 | case DW_CFA_same_value: | |
354 | case DW_CFA_def_cfa_register: | |
355 | case DW_CFA_def_cfa_offset: | |
356 | case DW_CFA_def_cfa_offset_sf: | |
357 | case DW_CFA_GNU_args_size: | |
358 | /* One leb128 argument. */ | |
359 | return skip_leb128 (iter, end); | |
360 | ||
ac685e6a JJ |
361 | case DW_CFA_val_offset: |
362 | case DW_CFA_val_offset_sf: | |
dcf507a6 RS |
363 | case DW_CFA_offset_extended: |
364 | case DW_CFA_register: | |
365 | case DW_CFA_def_cfa: | |
366 | case DW_CFA_offset_extended_sf: | |
367 | case DW_CFA_GNU_negative_offset_extended: | |
368 | case DW_CFA_def_cfa_sf: | |
369 | /* Two leb128 arguments. */ | |
370 | return (skip_leb128 (iter, end) | |
371 | && skip_leb128 (iter, end)); | |
372 | ||
373 | case DW_CFA_def_cfa_expression: | |
374 | /* A variable-length argument. */ | |
375 | return (read_uleb128 (iter, end, &length) | |
376 | && skip_bytes (iter, end, length)); | |
377 | ||
378 | case DW_CFA_expression: | |
ac685e6a | 379 | case DW_CFA_val_expression: |
dcf507a6 RS |
380 | /* A leb128 followed by a variable-length argument. */ |
381 | return (skip_leb128 (iter, end) | |
382 | && read_uleb128 (iter, end, &length) | |
383 | && skip_bytes (iter, end, length)); | |
384 | ||
385 | case DW_CFA_set_loc: | |
386 | return skip_bytes (iter, end, encoded_ptr_width); | |
387 | ||
388 | case DW_CFA_advance_loc1: | |
389 | return skip_bytes (iter, end, 1); | |
390 | ||
391 | case DW_CFA_advance_loc2: | |
392 | return skip_bytes (iter, end, 2); | |
393 | ||
394 | case DW_CFA_advance_loc4: | |
395 | return skip_bytes (iter, end, 4); | |
396 | ||
397 | case DW_CFA_MIPS_advance_loc8: | |
398 | return skip_bytes (iter, end, 8); | |
399 | ||
400 | default: | |
401 | return FALSE; | |
402 | } | |
403 | } | |
404 | ||
405 | /* Try to interpret the bytes between BUF and END as CFA instructions. | |
406 | If every byte makes sense, return a pointer to the first DW_CFA_nop | |
407 | padding byte, or END if there is no padding. Return null otherwise. | |
408 | ENCODED_PTR_WIDTH is as for skip_cfa_op. */ | |
409 | ||
410 | static bfd_byte * | |
ac685e6a JJ |
411 | skip_non_nops (bfd_byte *buf, bfd_byte *end, unsigned int encoded_ptr_width, |
412 | unsigned int *set_loc_count) | |
dcf507a6 RS |
413 | { |
414 | bfd_byte *last; | |
415 | ||
416 | last = buf; | |
417 | while (buf < end) | |
418 | if (*buf == DW_CFA_nop) | |
419 | buf++; | |
420 | else | |
421 | { | |
ac685e6a JJ |
422 | if (*buf == DW_CFA_set_loc) |
423 | ++*set_loc_count; | |
dcf507a6 RS |
424 | if (!skip_cfa_op (&buf, end, encoded_ptr_width)) |
425 | return 0; | |
426 | last = buf; | |
427 | } | |
428 | return last; | |
429 | } | |
430 | ||
30af5962 RS |
431 | /* Convert absolute encoding ENCODING into PC-relative form. |
432 | SIZE is the size of a pointer. */ | |
433 | ||
434 | static unsigned char | |
435 | make_pc_relative (unsigned char encoding, unsigned int ptr_size) | |
436 | { | |
437 | if ((encoding & 0x7f) == DW_EH_PE_absptr) | |
438 | switch (ptr_size) | |
439 | { | |
440 | case 2: | |
441 | encoding |= DW_EH_PE_sdata2; | |
442 | break; | |
443 | case 4: | |
444 | encoding |= DW_EH_PE_sdata4; | |
445 | break; | |
446 | case 8: | |
447 | encoding |= DW_EH_PE_sdata8; | |
448 | break; | |
449 | } | |
450 | return encoding | DW_EH_PE_pcrel; | |
451 | } | |
452 | ||
ca92cecb RS |
453 | /* Called before calling _bfd_elf_parse_eh_frame on every input bfd's |
454 | .eh_frame section. */ | |
65765700 | 455 | |
ca92cecb RS |
456 | void |
457 | _bfd_elf_begin_eh_frame_parsing (struct bfd_link_info *info) | |
458 | { | |
459 | struct eh_frame_hdr_info *hdr_info; | |
460 | ||
461 | hdr_info = &elf_hash_table (info)->eh_info; | |
184d07da | 462 | hdr_info->merge_cies = !info->relocatable; |
ca92cecb RS |
463 | } |
464 | ||
465 | /* Try to parse .eh_frame section SEC, which belongs to ABFD. Store the | |
466 | information in the section's sec_info field on success. COOKIE | |
467 | describes the relocations in SEC. */ | |
468 | ||
469 | void | |
470 | _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info, | |
471 | asection *sec, struct elf_reloc_cookie *cookie) | |
65765700 | 472 | { |
acfe5567 RS |
473 | #define REQUIRE(COND) \ |
474 | do \ | |
475 | if (!(COND)) \ | |
476 | goto free_no_table; \ | |
477 | while (0) | |
478 | ||
ca92cecb | 479 | bfd_byte *ehbuf = NULL, *buf, *end; |
bce613b9 | 480 | bfd_byte *last_fde; |
ca92cecb | 481 | struct eh_cie_fde *this_inf; |
bce613b9 | 482 | unsigned int hdr_length, hdr_id; |
184d07da RS |
483 | unsigned int cie_count; |
484 | struct cie *cie, *local_cies = NULL; | |
126495ed | 485 | struct elf_link_hash_table *htab; |
65765700 | 486 | struct eh_frame_hdr_info *hdr_info; |
68f69152 | 487 | struct eh_frame_sec_info *sec_info = NULL; |
65765700 | 488 | unsigned int ptr_size; |
ca92cecb RS |
489 | unsigned int num_cies; |
490 | unsigned int num_entries; | |
9d0a14d3 | 491 | elf_gc_mark_hook_fn gc_mark_hook; |
ca92cecb RS |
492 | |
493 | htab = elf_hash_table (info); | |
494 | hdr_info = &htab->eh_info; | |
495 | if (hdr_info->parsed_eh_frames) | |
496 | return; | |
65765700 | 497 | |
4d16d575 | 498 | if (sec->size == 0 |
dbaa2011 | 499 | || sec->sec_info_type != SEC_INFO_TYPE_NONE) |
65765700 JJ |
500 | { |
501 | /* This file does not contain .eh_frame information. */ | |
ca92cecb | 502 | return; |
65765700 JJ |
503 | } |
504 | ||
e460dd0d | 505 | if (bfd_is_abs_section (sec->output_section)) |
65765700 JJ |
506 | { |
507 | /* At least one of the sections is being discarded from the | |
3472e2e9 | 508 | link, so we should just ignore them. */ |
ca92cecb | 509 | return; |
65765700 JJ |
510 | } |
511 | ||
512 | /* Read the frame unwind information from abfd. */ | |
513 | ||
acfe5567 | 514 | REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf)); |
68f69152 | 515 | |
eea6121a | 516 | if (sec->size >= 4 |
65765700 JJ |
517 | && bfd_get_32 (abfd, ehbuf) == 0 |
518 | && cookie->rel == cookie->relend) | |
519 | { | |
520 | /* Empty .eh_frame section. */ | |
521 | free (ehbuf); | |
ca92cecb | 522 | return; |
65765700 JJ |
523 | } |
524 | ||
65765700 JJ |
525 | /* If .eh_frame section size doesn't fit into int, we cannot handle |
526 | it (it would need to use 64-bit .eh_frame format anyway). */ | |
acfe5567 | 527 | REQUIRE (sec->size == (unsigned int) sec->size); |
65765700 | 528 | |
8c946ed5 RS |
529 | ptr_size = (get_elf_backend_data (abfd) |
530 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
531 | REQUIRE (ptr_size != 0); | |
532 | ||
ca92cecb RS |
533 | /* Go through the section contents and work out how many FDEs and |
534 | CIEs there are. */ | |
65765700 | 535 | buf = ehbuf; |
ca92cecb RS |
536 | end = ehbuf + sec->size; |
537 | num_cies = 0; | |
538 | num_entries = 0; | |
539 | while (buf != end) | |
540 | { | |
541 | num_entries++; | |
542 | ||
543 | /* Read the length of the entry. */ | |
544 | REQUIRE (skip_bytes (&buf, end, 4)); | |
545 | hdr_length = bfd_get_32 (abfd, buf - 4); | |
546 | ||
547 | /* 64-bit .eh_frame is not supported. */ | |
548 | REQUIRE (hdr_length != 0xffffffff); | |
549 | if (hdr_length == 0) | |
550 | break; | |
551 | ||
552 | REQUIRE (skip_bytes (&buf, end, 4)); | |
553 | hdr_id = bfd_get_32 (abfd, buf - 4); | |
554 | if (hdr_id == 0) | |
555 | num_cies++; | |
556 | ||
557 | REQUIRE (skip_bytes (&buf, end, hdr_length - 4)); | |
558 | } | |
559 | ||
a50b1753 NC |
560 | sec_info = (struct eh_frame_sec_info *) |
561 | bfd_zmalloc (sizeof (struct eh_frame_sec_info) | |
562 | + (num_entries - 1) * sizeof (struct eh_cie_fde)); | |
acfe5567 | 563 | REQUIRE (sec_info); |
eea6121a | 564 | |
184d07da | 565 | /* We need to have a "struct cie" for each CIE in this section. */ |
a50b1753 | 566 | local_cies = (struct cie *) bfd_zmalloc (num_cies * sizeof (*local_cies)); |
184d07da | 567 | REQUIRE (local_cies); |
65765700 | 568 | |
5dabe785 | 569 | /* FIXME: octets_per_byte. */ |
65765700 | 570 | #define ENSURE_NO_RELOCS(buf) \ |
acfe5567 RS |
571 | REQUIRE (!(cookie->rel < cookie->relend \ |
572 | && (cookie->rel->r_offset \ | |
573 | < (bfd_size_type) ((buf) - ehbuf)) \ | |
574 | && cookie->rel->r_info != 0)) | |
65765700 | 575 | |
5dabe785 | 576 | /* FIXME: octets_per_byte. */ |
65765700 JJ |
577 | #define SKIP_RELOCS(buf) \ |
578 | while (cookie->rel < cookie->relend \ | |
3472e2e9 | 579 | && (cookie->rel->r_offset \ |
65765700 JJ |
580 | < (bfd_size_type) ((buf) - ehbuf))) \ |
581 | cookie->rel++ | |
582 | ||
5dabe785 | 583 | /* FIXME: octets_per_byte. */ |
65765700 JJ |
584 | #define GET_RELOC(buf) \ |
585 | ((cookie->rel < cookie->relend \ | |
586 | && (cookie->rel->r_offset \ | |
3472e2e9 | 587 | == (bfd_size_type) ((buf) - ehbuf))) \ |
65765700 JJ |
588 | ? cookie->rel : NULL) |
589 | ||
ca92cecb | 590 | buf = ehbuf; |
184d07da | 591 | cie_count = 0; |
9d0a14d3 | 592 | gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook; |
ca92cecb | 593 | while ((bfd_size_type) (buf - ehbuf) != sec->size) |
65765700 | 594 | { |
f075ee0c | 595 | char *aug; |
ca92cecb | 596 | bfd_byte *start, *insns, *insns_end; |
2c42be65 | 597 | bfd_size_type length; |
ac685e6a | 598 | unsigned int set_loc_count; |
65765700 | 599 | |
fda3ecf2 | 600 | this_inf = sec_info->entry + sec_info->count; |
65765700 | 601 | last_fde = buf; |
bce613b9 | 602 | |
bce613b9 JJ |
603 | /* Read the length of the entry. */ |
604 | REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); | |
605 | hdr_length = bfd_get_32 (abfd, buf - 4); | |
acfe5567 | 606 | |
bce613b9 JJ |
607 | /* The CIE/FDE must be fully contained in this input section. */ |
608 | REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr_length <= sec->size); | |
609 | end = buf + hdr_length; | |
65765700 | 610 | |
bce613b9 JJ |
611 | this_inf->offset = last_fde - ehbuf; |
612 | this_inf->size = 4 + hdr_length; | |
155eaaa0 | 613 | this_inf->reloc_index = cookie->rel - cookie->rels; |
bce613b9 JJ |
614 | |
615 | if (hdr_length == 0) | |
616 | { | |
617 | /* A zero-length CIE should only be found at the end of | |
618 | the section. */ | |
619 | REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); | |
620 | ENSURE_NO_RELOCS (buf); | |
621 | sec_info->count++; | |
622 | break; | |
65765700 JJ |
623 | } |
624 | ||
bce613b9 JJ |
625 | REQUIRE (skip_bytes (&buf, end, 4)); |
626 | hdr_id = bfd_get_32 (abfd, buf - 4); | |
627 | ||
628 | if (hdr_id == 0) | |
65765700 JJ |
629 | { |
630 | unsigned int initial_insn_length; | |
631 | ||
632 | /* CIE */ | |
bce613b9 JJ |
633 | this_inf->cie = 1; |
634 | ||
184d07da RS |
635 | /* Point CIE to one of the section-local cie structures. */ |
636 | cie = local_cies + cie_count++; | |
637 | ||
ca92cecb | 638 | cie->cie_inf = this_inf; |
bce613b9 | 639 | cie->length = hdr_length; |
ca92cecb | 640 | cie->output_sec = sec->output_section; |
ac685e6a | 641 | start = buf; |
bce613b9 | 642 | REQUIRE (read_byte (&buf, end, &cie->version)); |
65765700 JJ |
643 | |
644 | /* Cannot handle unknown versions. */ | |
604282a7 JJ |
645 | REQUIRE (cie->version == 1 |
646 | || cie->version == 3 | |
647 | || cie->version == 4); | |
bce613b9 | 648 | REQUIRE (strlen ((char *) buf) < sizeof (cie->augmentation)); |
65765700 | 649 | |
bce613b9 | 650 | strcpy (cie->augmentation, (char *) buf); |
f075ee0c | 651 | buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1; |
65765700 JJ |
652 | ENSURE_NO_RELOCS (buf); |
653 | if (buf[0] == 'e' && buf[1] == 'h') | |
654 | { | |
655 | /* GCC < 3.0 .eh_frame CIE */ | |
656 | /* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__ | |
657 | is private to each CIE, so we don't need it for anything. | |
658 | Just skip it. */ | |
2c42be65 | 659 | REQUIRE (skip_bytes (&buf, end, ptr_size)); |
65765700 JJ |
660 | SKIP_RELOCS (buf); |
661 | } | |
604282a7 JJ |
662 | if (cie->version >= 4) |
663 | { | |
664 | REQUIRE (buf + 1 < end); | |
665 | REQUIRE (buf[0] == ptr_size); | |
666 | REQUIRE (buf[1] == 0); | |
667 | buf += 2; | |
668 | } | |
bce613b9 JJ |
669 | REQUIRE (read_uleb128 (&buf, end, &cie->code_align)); |
670 | REQUIRE (read_sleb128 (&buf, end, &cie->data_align)); | |
671 | if (cie->version == 1) | |
2c42be65 RS |
672 | { |
673 | REQUIRE (buf < end); | |
bce613b9 | 674 | cie->ra_column = *buf++; |
2c42be65 | 675 | } |
0da76f83 | 676 | else |
bce613b9 | 677 | REQUIRE (read_uleb128 (&buf, end, &cie->ra_column)); |
65765700 | 678 | ENSURE_NO_RELOCS (buf); |
bce613b9 JJ |
679 | cie->lsda_encoding = DW_EH_PE_omit; |
680 | cie->fde_encoding = DW_EH_PE_omit; | |
681 | cie->per_encoding = DW_EH_PE_omit; | |
682 | aug = cie->augmentation; | |
65765700 JJ |
683 | if (aug[0] != 'e' || aug[1] != 'h') |
684 | { | |
685 | if (*aug == 'z') | |
686 | { | |
687 | aug++; | |
bce613b9 | 688 | REQUIRE (read_uleb128 (&buf, end, &cie->augmentation_size)); |
65765700 JJ |
689 | ENSURE_NO_RELOCS (buf); |
690 | } | |
691 | ||
692 | while (*aug != '\0') | |
693 | switch (*aug++) | |
694 | { | |
695 | case 'L': | |
bce613b9 | 696 | REQUIRE (read_byte (&buf, end, &cie->lsda_encoding)); |
65765700 | 697 | ENSURE_NO_RELOCS (buf); |
bce613b9 | 698 | REQUIRE (get_DW_EH_PE_width (cie->lsda_encoding, ptr_size)); |
65765700 JJ |
699 | break; |
700 | case 'R': | |
bce613b9 | 701 | REQUIRE (read_byte (&buf, end, &cie->fde_encoding)); |
65765700 | 702 | ENSURE_NO_RELOCS (buf); |
bce613b9 | 703 | REQUIRE (get_DW_EH_PE_width (cie->fde_encoding, ptr_size)); |
65765700 | 704 | break; |
63752a75 JJ |
705 | case 'S': |
706 | break; | |
65765700 JJ |
707 | case 'P': |
708 | { | |
709 | int per_width; | |
710 | ||
bce613b9 JJ |
711 | REQUIRE (read_byte (&buf, end, &cie->per_encoding)); |
712 | per_width = get_DW_EH_PE_width (cie->per_encoding, | |
65765700 | 713 | ptr_size); |
acfe5567 | 714 | REQUIRE (per_width); |
18e04883 | 715 | if ((cie->per_encoding & 0x70) == DW_EH_PE_aligned) |
2c42be65 RS |
716 | { |
717 | length = -(buf - ehbuf) & (per_width - 1); | |
718 | REQUIRE (skip_bytes (&buf, end, length)); | |
719 | } | |
18e04883 | 720 | this_inf->u.cie.personality_offset = buf - start; |
65765700 | 721 | ENSURE_NO_RELOCS (buf); |
f137a54e | 722 | /* Ensure we have a reloc here. */ |
184d07da RS |
723 | REQUIRE (GET_RELOC (buf)); |
724 | cie->personality.reloc_index | |
725 | = cookie->rel - cookie->rels; | |
726 | /* Cope with MIPS-style composite relocations. */ | |
727 | do | |
728 | cookie->rel++; | |
729 | while (GET_RELOC (buf) != NULL); | |
2c42be65 | 730 | REQUIRE (skip_bytes (&buf, end, per_width)); |
65765700 JJ |
731 | } |
732 | break; | |
733 | default: | |
734 | /* Unrecognized augmentation. Better bail out. */ | |
735 | goto free_no_table; | |
736 | } | |
737 | } | |
738 | ||
739 | /* For shared libraries, try to get rid of as many RELATIVE relocs | |
0bb2d96a | 740 | as possible. */ |
3472e2e9 | 741 | if (info->shared |
ec3391e7 AO |
742 | && (get_elf_backend_data (abfd) |
743 | ->elf_backend_can_make_relative_eh_frame | |
353057a5 RS |
744 | (abfd, info, sec))) |
745 | { | |
18e04883 | 746 | if ((cie->fde_encoding & 0x70) == DW_EH_PE_absptr) |
6b2cc140 | 747 | this_inf->make_relative = 1; |
353057a5 RS |
748 | /* If the CIE doesn't already have an 'R' entry, it's fairly |
749 | easy to add one, provided that there's no aligned data | |
750 | after the augmentation string. */ | |
bce613b9 | 751 | else if (cie->fde_encoding == DW_EH_PE_omit |
18e04883 | 752 | && (cie->per_encoding & 0x70) != DW_EH_PE_aligned) |
353057a5 | 753 | { |
bce613b9 | 754 | if (*cie->augmentation == 0) |
353057a5 | 755 | this_inf->add_augmentation_size = 1; |
6b2cc140 RS |
756 | this_inf->u.cie.add_fde_encoding = 1; |
757 | this_inf->make_relative = 1; | |
353057a5 | 758 | } |
65765700 | 759 | |
18e04883 RS |
760 | if ((cie->lsda_encoding & 0x70) == DW_EH_PE_absptr) |
761 | cie->can_make_lsda_relative = 1; | |
762 | } | |
9e2a4898 | 763 | |
65765700 JJ |
764 | /* If FDE encoding was not specified, it defaults to |
765 | DW_EH_absptr. */ | |
bce613b9 JJ |
766 | if (cie->fde_encoding == DW_EH_PE_omit) |
767 | cie->fde_encoding = DW_EH_PE_absptr; | |
65765700 | 768 | |
dcf507a6 | 769 | initial_insn_length = end - buf; |
99d190fa AM |
770 | cie->initial_insn_length = initial_insn_length; |
771 | memcpy (cie->initial_instructions, buf, | |
772 | initial_insn_length <= sizeof (cie->initial_instructions) | |
773 | ? initial_insn_length : sizeof (cie->initial_instructions)); | |
dcf507a6 | 774 | insns = buf; |
65765700 JJ |
775 | buf += initial_insn_length; |
776 | ENSURE_NO_RELOCS (buf); | |
ca92cecb | 777 | |
184d07da RS |
778 | if (hdr_info->merge_cies) |
779 | this_inf->u.cie.u.full_cie = cie; | |
6b2cc140 | 780 | this_inf->u.cie.per_encoding_relative |
ca92cecb | 781 | = (cie->per_encoding & 0x70) == DW_EH_PE_pcrel; |
65765700 JJ |
782 | } |
783 | else | |
784 | { | |
bce613b9 JJ |
785 | /* Find the corresponding CIE. */ |
786 | unsigned int cie_offset = this_inf->offset + 4 - hdr_id; | |
184d07da RS |
787 | for (cie = local_cies; cie < local_cies + cie_count; cie++) |
788 | if (cie_offset == cie->cie_inf->offset) | |
bce613b9 JJ |
789 | break; |
790 | ||
791 | /* Ensure this FDE references one of the CIEs in this input | |
792 | section. */ | |
184d07da RS |
793 | REQUIRE (cie != local_cies + cie_count); |
794 | this_inf->u.fde.cie_inf = cie->cie_inf; | |
795 | this_inf->make_relative = cie->cie_inf->make_relative; | |
6b2cc140 | 796 | this_inf->add_augmentation_size |
184d07da | 797 | = cie->cie_inf->add_augmentation_size; |
65765700 JJ |
798 | |
799 | ENSURE_NO_RELOCS (buf); | |
e41b3a13 | 800 | if ((sec->flags & SEC_LINKER_CREATED) == 0 || cookie->rels != NULL) |
2a7b2e88 | 801 | { |
e41b3a13 JJ |
802 | asection *rsec; |
803 | ||
804 | REQUIRE (GET_RELOC (buf)); | |
805 | ||
806 | /* Chain together the FDEs for each section. */ | |
807 | rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie); | |
808 | /* RSEC will be NULL if FDE was cleared out as it was belonging to | |
809 | a discarded SHT_GROUP. */ | |
810 | if (rsec) | |
811 | { | |
812 | REQUIRE (rsec->owner == abfd); | |
813 | this_inf->u.fde.next_for_section = elf_fde_list (rsec); | |
814 | elf_fde_list (rsec) = this_inf; | |
815 | } | |
2a7b2e88 | 816 | } |
9d0a14d3 | 817 | |
2c42be65 RS |
818 | /* Skip the initial location and address range. */ |
819 | start = buf; | |
bce613b9 | 820 | length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); |
2c42be65 RS |
821 | REQUIRE (skip_bytes (&buf, end, 2 * length)); |
822 | ||
823 | /* Skip the augmentation size, if present. */ | |
bce613b9 | 824 | if (cie->augmentation[0] == 'z') |
dcf507a6 RS |
825 | REQUIRE (read_uleb128 (&buf, end, &length)); |
826 | else | |
827 | length = 0; | |
2c42be65 RS |
828 | |
829 | /* Of the supported augmentation characters above, only 'L' | |
830 | adds augmentation data to the FDE. This code would need to | |
831 | be adjusted if any future augmentations do the same thing. */ | |
bce613b9 | 832 | if (cie->lsda_encoding != DW_EH_PE_omit) |
dcf507a6 | 833 | { |
9f4b847e RS |
834 | SKIP_RELOCS (buf); |
835 | if (cie->can_make_lsda_relative && GET_RELOC (buf)) | |
836 | cie->cie_inf->u.cie.make_lsda_relative = 1; | |
dcf507a6 RS |
837 | this_inf->lsda_offset = buf - start; |
838 | /* If there's no 'z' augmentation, we don't know where the | |
839 | CFA insns begin. Assume no padding. */ | |
bce613b9 | 840 | if (cie->augmentation[0] != 'z') |
dcf507a6 RS |
841 | length = end - buf; |
842 | } | |
843 | ||
844 | /* Skip over the augmentation data. */ | |
845 | REQUIRE (skip_bytes (&buf, end, length)); | |
846 | insns = buf; | |
9e2a4898 | 847 | |
bce613b9 | 848 | buf = last_fde + 4 + hdr_length; |
2a7b2e88 | 849 | |
273f4430 JK |
850 | /* For NULL RSEC (cleared FDE belonging to a discarded section) |
851 | the relocations are commonly cleared. We do not sanity check if | |
852 | all these relocations are cleared as (1) relocations to | |
853 | .gcc_except_table will remain uncleared (they will get dropped | |
854 | with the drop of this unused FDE) and (2) BFD already safely drops | |
855 | relocations of any type to .eh_frame by | |
856 | elf_section_ignore_discarded_relocs. | |
857 | TODO: The .gcc_except_table entries should be also filtered as | |
858 | .eh_frame entries; or GCC could rather use COMDAT for them. */ | |
859 | SKIP_RELOCS (buf); | |
65765700 JJ |
860 | } |
861 | ||
dcf507a6 RS |
862 | /* Try to interpret the CFA instructions and find the first |
863 | padding nop. Shrink this_inf's size so that it doesn't | |
ac685e6a | 864 | include the padding. */ |
bce613b9 | 865 | length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); |
ac685e6a JJ |
866 | set_loc_count = 0; |
867 | insns_end = skip_non_nops (insns, end, length, &set_loc_count); | |
868 | /* If we don't understand the CFA instructions, we can't know | |
869 | what needs to be adjusted there. */ | |
870 | if (insns_end == NULL | |
871 | /* For the time being we don't support DW_CFA_set_loc in | |
872 | CIE instructions. */ | |
873 | || (set_loc_count && this_inf->cie)) | |
874 | goto free_no_table; | |
875 | this_inf->size -= end - insns_end; | |
bce613b9 JJ |
876 | if (insns_end != end && this_inf->cie) |
877 | { | |
878 | cie->initial_insn_length -= end - insns_end; | |
879 | cie->length -= end - insns_end; | |
880 | } | |
ac685e6a | 881 | if (set_loc_count |
18e04883 | 882 | && ((cie->fde_encoding & 0x70) == DW_EH_PE_pcrel |
6b2cc140 | 883 | || this_inf->make_relative)) |
ac685e6a JJ |
884 | { |
885 | unsigned int cnt; | |
886 | bfd_byte *p; | |
887 | ||
a50b1753 NC |
888 | this_inf->set_loc = (unsigned int *) |
889 | bfd_malloc ((set_loc_count + 1) * sizeof (unsigned int)); | |
ac685e6a JJ |
890 | REQUIRE (this_inf->set_loc); |
891 | this_inf->set_loc[0] = set_loc_count; | |
892 | p = insns; | |
893 | cnt = 0; | |
894 | while (p < end) | |
895 | { | |
896 | if (*p == DW_CFA_set_loc) | |
897 | this_inf->set_loc[++cnt] = p + 1 - start; | |
898 | REQUIRE (skip_cfa_op (&p, end, length)); | |
899 | } | |
900 | } | |
dcf507a6 | 901 | |
ca92cecb | 902 | this_inf->removed = 1; |
bce613b9 JJ |
903 | this_inf->fde_encoding = cie->fde_encoding; |
904 | this_inf->lsda_encoding = cie->lsda_encoding; | |
65765700 JJ |
905 | sec_info->count++; |
906 | } | |
ca92cecb | 907 | BFD_ASSERT (sec_info->count == num_entries); |
184d07da | 908 | BFD_ASSERT (cie_count == num_cies); |
65765700 JJ |
909 | |
910 | elf_section_data (sec)->sec_info = sec_info; | |
dbaa2011 | 911 | sec->sec_info_type = SEC_INFO_TYPE_EH_FRAME; |
184d07da RS |
912 | if (hdr_info->merge_cies) |
913 | { | |
914 | sec_info->cies = local_cies; | |
915 | local_cies = NULL; | |
916 | } | |
ca92cecb | 917 | goto success; |
65765700 | 918 | |
ca92cecb RS |
919 | free_no_table: |
920 | (*info->callbacks->einfo) | |
921 | (_("%P: error in %B(%A); no .eh_frame_hdr table will be created.\n"), | |
922 | abfd, sec); | |
923 | hdr_info->table = FALSE; | |
924 | if (sec_info) | |
925 | free (sec_info); | |
926 | success: | |
927 | if (ehbuf) | |
928 | free (ehbuf); | |
ca92cecb RS |
929 | if (local_cies) |
930 | free (local_cies); | |
931 | #undef REQUIRE | |
932 | } | |
bce613b9 | 933 | |
ca92cecb RS |
934 | /* Finish a pass over all .eh_frame sections. */ |
935 | ||
936 | void | |
937 | _bfd_elf_end_eh_frame_parsing (struct bfd_link_info *info) | |
938 | { | |
939 | struct eh_frame_hdr_info *hdr_info; | |
940 | ||
941 | hdr_info = &elf_hash_table (info)->eh_info; | |
ca92cecb RS |
942 | hdr_info->parsed_eh_frames = TRUE; |
943 | } | |
bce613b9 | 944 | |
9d0a14d3 RS |
945 | /* Mark all relocations against CIE or FDE ENT, which occurs in |
946 | .eh_frame section SEC. COOKIE describes the relocations in SEC; | |
947 | its "rel" field can be changed freely. */ | |
948 | ||
949 | static bfd_boolean | |
950 | mark_entry (struct bfd_link_info *info, asection *sec, | |
951 | struct eh_cie_fde *ent, elf_gc_mark_hook_fn gc_mark_hook, | |
952 | struct elf_reloc_cookie *cookie) | |
953 | { | |
5dabe785 | 954 | /* FIXME: octets_per_byte. */ |
9d0a14d3 RS |
955 | for (cookie->rel = cookie->rels + ent->reloc_index; |
956 | cookie->rel < cookie->relend | |
957 | && cookie->rel->r_offset < ent->offset + ent->size; | |
958 | cookie->rel++) | |
959 | if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, cookie)) | |
960 | return FALSE; | |
961 | ||
962 | return TRUE; | |
963 | } | |
964 | ||
965 | /* Mark all the relocations against FDEs that relate to code in input | |
966 | section SEC. The FDEs belong to .eh_frame section EH_FRAME, whose | |
967 | relocations are described by COOKIE. */ | |
968 | ||
969 | bfd_boolean | |
970 | _bfd_elf_gc_mark_fdes (struct bfd_link_info *info, asection *sec, | |
971 | asection *eh_frame, elf_gc_mark_hook_fn gc_mark_hook, | |
972 | struct elf_reloc_cookie *cookie) | |
973 | { | |
184d07da | 974 | struct eh_cie_fde *fde, *cie; |
9d0a14d3 RS |
975 | |
976 | for (fde = elf_fde_list (sec); fde; fde = fde->u.fde.next_for_section) | |
977 | { | |
978 | if (!mark_entry (info, eh_frame, fde, gc_mark_hook, cookie)) | |
979 | return FALSE; | |
980 | ||
981 | /* At this stage, all cie_inf fields point to local CIEs, so we | |
982 | can use the same cookie to refer to them. */ | |
983 | cie = fde->u.fde.cie_inf; | |
184d07da | 984 | if (!cie->u.cie.gc_mark) |
9d0a14d3 | 985 | { |
184d07da | 986 | cie->u.cie.gc_mark = 1; |
9d0a14d3 RS |
987 | if (!mark_entry (info, eh_frame, cie, gc_mark_hook, cookie)) |
988 | return FALSE; | |
989 | } | |
990 | } | |
991 | return TRUE; | |
992 | } | |
993 | ||
184d07da RS |
994 | /* Input section SEC of ABFD is an .eh_frame section that contains the |
995 | CIE described by CIE_INF. Return a version of CIE_INF that is going | |
996 | to be kept in the output, adding CIE_INF to the output if necessary. | |
997 | ||
998 | HDR_INFO is the .eh_frame_hdr information and COOKIE describes the | |
999 | relocations in REL. */ | |
1000 | ||
1001 | static struct eh_cie_fde * | |
18e04883 | 1002 | find_merged_cie (bfd *abfd, struct bfd_link_info *info, asection *sec, |
184d07da RS |
1003 | struct eh_frame_hdr_info *hdr_info, |
1004 | struct elf_reloc_cookie *cookie, | |
1005 | struct eh_cie_fde *cie_inf) | |
1006 | { | |
1007 | unsigned long r_symndx; | |
1008 | struct cie *cie, *new_cie; | |
1009 | Elf_Internal_Rela *rel; | |
1010 | void **loc; | |
1011 | ||
1012 | /* Use CIE_INF if we have already decided to keep it. */ | |
1013 | if (!cie_inf->removed) | |
1014 | return cie_inf; | |
1015 | ||
1016 | /* If we have merged CIE_INF with another CIE, use that CIE instead. */ | |
1017 | if (cie_inf->u.cie.merged) | |
1018 | return cie_inf->u.cie.u.merged_with; | |
1019 | ||
1020 | cie = cie_inf->u.cie.u.full_cie; | |
1021 | ||
1022 | /* Assume we will need to keep CIE_INF. */ | |
1023 | cie_inf->removed = 0; | |
1024 | cie_inf->u.cie.u.sec = sec; | |
1025 | ||
1026 | /* If we are not merging CIEs, use CIE_INF. */ | |
1027 | if (cie == NULL) | |
1028 | return cie_inf; | |
1029 | ||
1030 | if (cie->per_encoding != DW_EH_PE_omit) | |
1031 | { | |
18e04883 RS |
1032 | bfd_boolean per_binds_local; |
1033 | ||
184d07da RS |
1034 | /* Work out the address of personality routine, either as an absolute |
1035 | value or as a symbol. */ | |
1036 | rel = cookie->rels + cie->personality.reloc_index; | |
1037 | memset (&cie->personality, 0, sizeof (cie->personality)); | |
1038 | #ifdef BFD64 | |
1039 | if (elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64) | |
1040 | r_symndx = ELF64_R_SYM (rel->r_info); | |
1041 | else | |
1042 | #endif | |
1043 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1044 | if (r_symndx >= cookie->locsymcount | |
1045 | || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL) | |
1046 | { | |
1047 | struct elf_link_hash_entry *h; | |
1048 | ||
1049 | r_symndx -= cookie->extsymoff; | |
1050 | h = cookie->sym_hashes[r_symndx]; | |
1051 | ||
1052 | while (h->root.type == bfd_link_hash_indirect | |
1053 | || h->root.type == bfd_link_hash_warning) | |
1054 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1055 | ||
1056 | cie->personality.h = h; | |
18e04883 | 1057 | per_binds_local = SYMBOL_REFERENCES_LOCAL (info, h); |
184d07da RS |
1058 | } |
1059 | else | |
1060 | { | |
1061 | Elf_Internal_Sym *sym; | |
1062 | asection *sym_sec; | |
1063 | ||
1064 | sym = &cookie->locsyms[r_symndx]; | |
1065 | sym_sec = bfd_section_from_elf_index (abfd, sym->st_shndx); | |
1066 | if (sym_sec == NULL) | |
1067 | return cie_inf; | |
1068 | ||
1069 | if (sym_sec->kept_section != NULL) | |
1070 | sym_sec = sym_sec->kept_section; | |
1071 | if (sym_sec->output_section == NULL) | |
1072 | return cie_inf; | |
1073 | ||
1074 | cie->local_personality = 1; | |
1075 | cie->personality.val = (sym->st_value | |
1076 | + sym_sec->output_offset | |
1077 | + sym_sec->output_section->vma); | |
18e04883 RS |
1078 | per_binds_local = TRUE; |
1079 | } | |
1080 | ||
1081 | if (per_binds_local | |
1082 | && info->shared | |
1083 | && (cie->per_encoding & 0x70) == DW_EH_PE_absptr | |
1084 | && (get_elf_backend_data (abfd) | |
1085 | ->elf_backend_can_make_relative_eh_frame (abfd, info, sec))) | |
1086 | { | |
1087 | cie_inf->u.cie.make_per_encoding_relative = 1; | |
1088 | cie_inf->u.cie.per_encoding_relative = 1; | |
184d07da RS |
1089 | } |
1090 | } | |
1091 | ||
1092 | /* See if we can merge this CIE with an earlier one. */ | |
1093 | cie->output_sec = sec->output_section; | |
1094 | cie_compute_hash (cie); | |
1095 | if (hdr_info->cies == NULL) | |
1096 | { | |
1097 | hdr_info->cies = htab_try_create (1, cie_hash, cie_eq, free); | |
1098 | if (hdr_info->cies == NULL) | |
1099 | return cie_inf; | |
1100 | } | |
1101 | loc = htab_find_slot_with_hash (hdr_info->cies, cie, cie->hash, INSERT); | |
1102 | if (loc == NULL) | |
1103 | return cie_inf; | |
1104 | ||
1105 | new_cie = (struct cie *) *loc; | |
1106 | if (new_cie == NULL) | |
1107 | { | |
1108 | /* Keep CIE_INF and record it in the hash table. */ | |
a50b1753 | 1109 | new_cie = (struct cie *) malloc (sizeof (struct cie)); |
184d07da RS |
1110 | if (new_cie == NULL) |
1111 | return cie_inf; | |
1112 | ||
1113 | memcpy (new_cie, cie, sizeof (struct cie)); | |
1114 | *loc = new_cie; | |
1115 | } | |
1116 | else | |
1117 | { | |
1118 | /* Merge CIE_INF with NEW_CIE->CIE_INF. */ | |
1119 | cie_inf->removed = 1; | |
1120 | cie_inf->u.cie.merged = 1; | |
1121 | cie_inf->u.cie.u.merged_with = new_cie->cie_inf; | |
1122 | if (cie_inf->u.cie.make_lsda_relative) | |
1123 | new_cie->cie_inf->u.cie.make_lsda_relative = 1; | |
1124 | } | |
1125 | return new_cie->cie_inf; | |
1126 | } | |
1127 | ||
ca92cecb RS |
1128 | /* This function is called for each input file before the .eh_frame |
1129 | section is relocated. It discards duplicate CIEs and FDEs for discarded | |
1130 | functions. The function returns TRUE iff any entries have been | |
1131 | deleted. */ | |
1132 | ||
1133 | bfd_boolean | |
1134 | _bfd_elf_discard_section_eh_frame | |
1135 | (bfd *abfd, struct bfd_link_info *info, asection *sec, | |
1136 | bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *), | |
1137 | struct elf_reloc_cookie *cookie) | |
1138 | { | |
184d07da | 1139 | struct eh_cie_fde *ent; |
ca92cecb RS |
1140 | struct eh_frame_sec_info *sec_info; |
1141 | struct eh_frame_hdr_info *hdr_info; | |
1142 | unsigned int ptr_size, offset; | |
1143 | ||
dbaa2011 | 1144 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
4d16d575 AM |
1145 | return FALSE; |
1146 | ||
ca92cecb RS |
1147 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
1148 | if (sec_info == NULL) | |
1149 | return FALSE; | |
1150 | ||
e41b3a13 JJ |
1151 | ptr_size = (get_elf_backend_data (sec->owner) |
1152 | ->elf_backend_eh_frame_address_size (sec->owner, sec)); | |
1153 | ||
ca92cecb | 1154 | hdr_info = &elf_hash_table (info)->eh_info; |
fda3ecf2 | 1155 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
f60e73e9 AM |
1156 | if (ent->size == 4) |
1157 | /* There should only be one zero terminator, on the last input | |
1158 | file supplying .eh_frame (crtend.o). Remove any others. */ | |
1159 | ent->removed = sec->map_head.s != NULL; | |
1160 | else if (!ent->cie) | |
fda3ecf2 | 1161 | { |
e41b3a13 JJ |
1162 | bfd_boolean keep; |
1163 | if ((sec->flags & SEC_LINKER_CREATED) != 0 && cookie->rels == NULL) | |
1164 | { | |
1165 | unsigned int width | |
1166 | = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1167 | bfd_vma value | |
1168 | = read_value (abfd, sec->contents + ent->offset + 8 + width, | |
1169 | width, get_DW_EH_PE_signed (ent->fde_encoding)); | |
1170 | keep = value != 0; | |
1171 | } | |
1172 | else | |
1173 | { | |
1174 | cookie->rel = cookie->rels + ent->reloc_index; | |
1175 | /* FIXME: octets_per_byte. */ | |
1176 | BFD_ASSERT (cookie->rel < cookie->relend | |
1177 | && cookie->rel->r_offset == ent->offset + 8); | |
1178 | keep = !(*reloc_symbol_deleted_p) (ent->offset + 8, cookie); | |
1179 | } | |
1180 | if (keep) | |
bce613b9 | 1181 | { |
ca92cecb | 1182 | if (info->shared |
18e04883 | 1183 | && (((ent->fde_encoding & 0x70) == DW_EH_PE_absptr |
6b2cc140 | 1184 | && ent->make_relative == 0) |
18e04883 | 1185 | || (ent->fde_encoding & 0x70) == DW_EH_PE_aligned)) |
ca92cecb RS |
1186 | { |
1187 | /* If a shared library uses absolute pointers | |
1188 | which we cannot turn into PC relative, | |
1189 | don't create the binary search table, | |
1190 | since it is affected by runtime relocations. */ | |
1191 | hdr_info->table = FALSE; | |
1192 | (*info->callbacks->einfo) | |
1193 | (_("%P: fde encoding in %B(%A) prevents .eh_frame_hdr" | |
1194 | " table being created.\n"), abfd, sec); | |
1195 | } | |
1196 | ent->removed = 0; | |
1197 | hdr_info->fde_count++; | |
18e04883 RS |
1198 | ent->u.fde.cie_inf = find_merged_cie (abfd, info, sec, hdr_info, |
1199 | cookie, ent->u.fde.cie_inf); | |
bce613b9 | 1200 | } |
ca92cecb RS |
1201 | } |
1202 | ||
184d07da RS |
1203 | if (sec_info->cies) |
1204 | { | |
1205 | free (sec_info->cies); | |
1206 | sec_info->cies = NULL; | |
1207 | } | |
1208 | ||
ca92cecb RS |
1209 | offset = 0; |
1210 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) | |
1211 | if (!ent->removed) | |
1212 | { | |
353057a5 RS |
1213 | ent->new_offset = offset; |
1214 | offset += size_of_output_cie_fde (ent, ptr_size); | |
fda3ecf2 | 1215 | } |
65765700 | 1216 | |
eea6121a | 1217 | sec->rawsize = sec->size; |
353057a5 | 1218 | sec->size = offset; |
353057a5 | 1219 | return offset != sec->rawsize; |
65765700 JJ |
1220 | } |
1221 | ||
1222 | /* This function is called for .eh_frame_hdr section after | |
1223 | _bfd_elf_discard_section_eh_frame has been called on all .eh_frame | |
1224 | input sections. It finalizes the size of .eh_frame_hdr section. */ | |
1225 | ||
b34976b6 | 1226 | bfd_boolean |
c39a58e6 | 1227 | _bfd_elf_discard_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
65765700 | 1228 | { |
126495ed | 1229 | struct elf_link_hash_table *htab; |
65765700 | 1230 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 1231 | asection *sec; |
65765700 | 1232 | |
126495ed AM |
1233 | htab = elf_hash_table (info); |
1234 | hdr_info = &htab->eh_info; | |
bce613b9 | 1235 | |
184d07da RS |
1236 | if (hdr_info->cies != NULL) |
1237 | { | |
1238 | htab_delete (hdr_info->cies); | |
1239 | hdr_info->cies = NULL; | |
1240 | } | |
1241 | ||
126495ed AM |
1242 | sec = hdr_info->hdr_sec; |
1243 | if (sec == NULL) | |
b34976b6 | 1244 | return FALSE; |
126495ed | 1245 | |
eea6121a | 1246 | sec->size = EH_FRAME_HDR_SIZE; |
65765700 | 1247 | if (hdr_info->table) |
eea6121a | 1248 | sec->size += 4 + hdr_info->fde_count * 8; |
65765700 | 1249 | |
12bd6957 | 1250 | elf_eh_frame_hdr (abfd) = sec; |
b34976b6 | 1251 | return TRUE; |
65765700 JJ |
1252 | } |
1253 | ||
9a2a56cc AM |
1254 | /* Return true if there is at least one non-empty .eh_frame section in |
1255 | input files. Can only be called after ld has mapped input to | |
1256 | output sections, and before sections are stripped. */ | |
1257 | bfd_boolean | |
1258 | _bfd_elf_eh_frame_present (struct bfd_link_info *info) | |
1259 | { | |
1260 | asection *eh = bfd_get_section_by_name (info->output_bfd, ".eh_frame"); | |
1261 | ||
1262 | if (eh == NULL) | |
1263 | return FALSE; | |
1264 | ||
1265 | /* Count only sections which have at least a single CIE or FDE. | |
1266 | There cannot be any CIE or FDE <= 8 bytes. */ | |
1267 | for (eh = eh->map_head.s; eh != NULL; eh = eh->map_head.s) | |
1268 | if (eh->size > 8) | |
1269 | return TRUE; | |
1270 | ||
1271 | return FALSE; | |
1272 | } | |
1273 | ||
68f69152 JJ |
1274 | /* This function is called from size_dynamic_sections. |
1275 | It needs to decide whether .eh_frame_hdr should be output or not, | |
8423293d AM |
1276 | because when the dynamic symbol table has been sized it is too late |
1277 | to strip sections. */ | |
68f69152 | 1278 | |
b34976b6 | 1279 | bfd_boolean |
c39a58e6 | 1280 | _bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info) |
68f69152 | 1281 | { |
126495ed | 1282 | struct elf_link_hash_table *htab; |
68f69152 JJ |
1283 | struct eh_frame_hdr_info *hdr_info; |
1284 | ||
126495ed AM |
1285 | htab = elf_hash_table (info); |
1286 | hdr_info = &htab->eh_info; | |
1287 | if (hdr_info->hdr_sec == NULL) | |
b34976b6 | 1288 | return TRUE; |
68f69152 | 1289 | |
9a2a56cc AM |
1290 | if (bfd_is_abs_section (hdr_info->hdr_sec->output_section) |
1291 | || !info->eh_frame_hdr | |
1292 | || !_bfd_elf_eh_frame_present (info)) | |
68f69152 | 1293 | { |
8423293d | 1294 | hdr_info->hdr_sec->flags |= SEC_EXCLUDE; |
126495ed | 1295 | hdr_info->hdr_sec = NULL; |
b34976b6 | 1296 | return TRUE; |
68f69152 | 1297 | } |
126495ed | 1298 | |
b34976b6 AM |
1299 | hdr_info->table = TRUE; |
1300 | return TRUE; | |
68f69152 JJ |
1301 | } |
1302 | ||
65765700 JJ |
1303 | /* Adjust an address in the .eh_frame section. Given OFFSET within |
1304 | SEC, this returns the new offset in the adjusted .eh_frame section, | |
1305 | or -1 if the address refers to a CIE/FDE which has been removed | |
1306 | or to offset with dynamic relocation which is no longer needed. */ | |
1307 | ||
1308 | bfd_vma | |
c39a58e6 | 1309 | _bfd_elf_eh_frame_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, |
3d540e93 | 1310 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
c39a58e6 AM |
1311 | asection *sec, |
1312 | bfd_vma offset) | |
65765700 JJ |
1313 | { |
1314 | struct eh_frame_sec_info *sec_info; | |
1315 | unsigned int lo, hi, mid; | |
1316 | ||
dbaa2011 | 1317 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
65765700 | 1318 | return offset; |
a50b1753 | 1319 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
65765700 | 1320 | |
eea6121a AM |
1321 | if (offset >= sec->rawsize) |
1322 | return offset - sec->rawsize + sec->size; | |
65765700 JJ |
1323 | |
1324 | lo = 0; | |
1325 | hi = sec_info->count; | |
1326 | mid = 0; | |
1327 | while (lo < hi) | |
1328 | { | |
1329 | mid = (lo + hi) / 2; | |
1330 | if (offset < sec_info->entry[mid].offset) | |
1331 | hi = mid; | |
1332 | else if (offset | |
1333 | >= sec_info->entry[mid].offset + sec_info->entry[mid].size) | |
1334 | lo = mid + 1; | |
1335 | else | |
1336 | break; | |
1337 | } | |
1338 | ||
1339 | BFD_ASSERT (lo < hi); | |
1340 | ||
1341 | /* FDE or CIE was removed. */ | |
1342 | if (sec_info->entry[mid].removed) | |
1343 | return (bfd_vma) -1; | |
1344 | ||
18e04883 RS |
1345 | /* If converting personality pointers to DW_EH_PE_pcrel, there will be |
1346 | no need for run-time relocation against the personality field. */ | |
1347 | if (sec_info->entry[mid].cie | |
1348 | && sec_info->entry[mid].u.cie.make_per_encoding_relative | |
1349 | && offset == (sec_info->entry[mid].offset + 8 | |
1350 | + sec_info->entry[mid].u.cie.personality_offset)) | |
1351 | return (bfd_vma) -2; | |
1352 | ||
65765700 JJ |
1353 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1354 | relocation against FDE's initial_location field. */ | |
fda3ecf2 | 1355 | if (!sec_info->entry[mid].cie |
6b2cc140 | 1356 | && sec_info->entry[mid].make_relative |
353057a5 RS |
1357 | && offset == sec_info->entry[mid].offset + 8) |
1358 | return (bfd_vma) -2; | |
65765700 | 1359 | |
9e2a4898 JJ |
1360 | /* If converting LSDA pointers to DW_EH_PE_pcrel, there will be no need |
1361 | for run-time relocation against LSDA field. */ | |
fda3ecf2 | 1362 | if (!sec_info->entry[mid].cie |
9f4b847e RS |
1363 | && sec_info->entry[mid].u.fde.cie_inf->u.cie.make_lsda_relative |
1364 | && offset == (sec_info->entry[mid].offset + 8 | |
1365 | + sec_info->entry[mid].lsda_offset)) | |
1366 | return (bfd_vma) -2; | |
9e2a4898 | 1367 | |
ac685e6a JJ |
1368 | /* If converting to DW_EH_PE_pcrel, there will be no need for run-time |
1369 | relocation against DW_CFA_set_loc's arguments. */ | |
1370 | if (sec_info->entry[mid].set_loc | |
6b2cc140 | 1371 | && sec_info->entry[mid].make_relative |
ac685e6a JJ |
1372 | && (offset >= sec_info->entry[mid].offset + 8 |
1373 | + sec_info->entry[mid].set_loc[1])) | |
1374 | { | |
1375 | unsigned int cnt; | |
1376 | ||
1377 | for (cnt = 1; cnt <= sec_info->entry[mid].set_loc[0]; cnt++) | |
1378 | if (offset == sec_info->entry[mid].offset + 8 | |
1379 | + sec_info->entry[mid].set_loc[cnt]) | |
1380 | return (bfd_vma) -2; | |
1381 | } | |
1382 | ||
353057a5 | 1383 | /* Any new augmentation bytes go before the first relocation. */ |
c68836a9 | 1384 | return (offset + sec_info->entry[mid].new_offset |
353057a5 RS |
1385 | - sec_info->entry[mid].offset |
1386 | + extra_augmentation_string_bytes (sec_info->entry + mid) | |
1387 | + extra_augmentation_data_bytes (sec_info->entry + mid)); | |
65765700 JJ |
1388 | } |
1389 | ||
1390 | /* Write out .eh_frame section. This is called with the relocated | |
1391 | contents. */ | |
1392 | ||
b34976b6 | 1393 | bfd_boolean |
c39a58e6 AM |
1394 | _bfd_elf_write_section_eh_frame (bfd *abfd, |
1395 | struct bfd_link_info *info, | |
1396 | asection *sec, | |
1397 | bfd_byte *contents) | |
65765700 JJ |
1398 | { |
1399 | struct eh_frame_sec_info *sec_info; | |
126495ed | 1400 | struct elf_link_hash_table *htab; |
65765700 | 1401 | struct eh_frame_hdr_info *hdr_info; |
65765700 | 1402 | unsigned int ptr_size; |
fda3ecf2 | 1403 | struct eh_cie_fde *ent; |
65765700 | 1404 | |
dbaa2011 | 1405 | if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) |
5dabe785 | 1406 | /* FIXME: octets_per_byte. */ |
c39a58e6 | 1407 | return bfd_set_section_contents (abfd, sec->output_section, contents, |
eea6121a | 1408 | sec->output_offset, sec->size); |
8c946ed5 RS |
1409 | |
1410 | ptr_size = (get_elf_backend_data (abfd) | |
1411 | ->elf_backend_eh_frame_address_size (abfd, sec)); | |
1412 | BFD_ASSERT (ptr_size != 0); | |
1413 | ||
a50b1753 | 1414 | sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; |
126495ed AM |
1415 | htab = elf_hash_table (info); |
1416 | hdr_info = &htab->eh_info; | |
3472e2e9 | 1417 | |
126495ed | 1418 | if (hdr_info->table && hdr_info->array == NULL) |
a50b1753 NC |
1419 | hdr_info->array = (struct eh_frame_array_ent *) |
1420 | bfd_malloc (hdr_info->fde_count * sizeof(*hdr_info->array)); | |
126495ed AM |
1421 | if (hdr_info->array == NULL) |
1422 | hdr_info = NULL; | |
65765700 | 1423 | |
353057a5 RS |
1424 | /* The new offsets can be bigger or smaller than the original offsets. |
1425 | We therefore need to make two passes over the section: one backward | |
1426 | pass to move entries up and one forward pass to move entries down. | |
1427 | The two passes won't interfere with each other because entries are | |
1428 | not reordered */ | |
1429 | for (ent = sec_info->entry + sec_info->count; ent-- != sec_info->entry;) | |
1430 | if (!ent->removed && ent->new_offset > ent->offset) | |
fc802241 | 1431 | memmove (contents + ent->new_offset, contents + ent->offset, ent->size); |
353057a5 RS |
1432 | |
1433 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) | |
1434 | if (!ent->removed && ent->new_offset < ent->offset) | |
fc802241 | 1435 | memmove (contents + ent->new_offset, contents + ent->offset, ent->size); |
353057a5 | 1436 | |
fda3ecf2 | 1437 | for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) |
65765700 | 1438 | { |
353057a5 RS |
1439 | unsigned char *buf, *end; |
1440 | unsigned int new_size; | |
1441 | ||
fda3ecf2 AM |
1442 | if (ent->removed) |
1443 | continue; | |
1444 | ||
353057a5 RS |
1445 | if (ent->size == 4) |
1446 | { | |
1447 | /* Any terminating FDE must be at the end of the section. */ | |
1448 | BFD_ASSERT (ent == sec_info->entry + sec_info->count - 1); | |
1449 | continue; | |
1450 | } | |
1451 | ||
fc802241 | 1452 | buf = contents + ent->new_offset; |
353057a5 RS |
1453 | end = buf + ent->size; |
1454 | new_size = size_of_output_cie_fde (ent, ptr_size); | |
1455 | ||
a34a056a L |
1456 | /* Update the size. It may be shrinked. */ |
1457 | bfd_put_32 (abfd, new_size - 4, buf); | |
1458 | ||
1459 | /* Filling the extra bytes with DW_CFA_nops. */ | |
353057a5 | 1460 | if (new_size != ent->size) |
a34a056a | 1461 | memset (end, 0, new_size - ent->size); |
353057a5 | 1462 | |
fda3ecf2 | 1463 | if (ent->cie) |
65765700 JJ |
1464 | { |
1465 | /* CIE */ | |
353057a5 | 1466 | if (ent->make_relative |
9f4b847e | 1467 | || ent->u.cie.make_lsda_relative |
6b2cc140 | 1468 | || ent->u.cie.per_encoding_relative) |
65765700 | 1469 | { |
f075ee0c | 1470 | char *aug; |
353057a5 | 1471 | unsigned int action, extra_string, extra_data; |
2c42be65 | 1472 | unsigned int per_width, per_encoding; |
65765700 | 1473 | |
9e2a4898 | 1474 | /* Need to find 'R' or 'L' augmentation's argument and modify |
65765700 | 1475 | DW_EH_PE_* value. */ |
353057a5 | 1476 | action = ((ent->make_relative ? 1 : 0) |
9f4b847e | 1477 | | (ent->u.cie.make_lsda_relative ? 2 : 0) |
6b2cc140 | 1478 | | (ent->u.cie.per_encoding_relative ? 4 : 0)); |
353057a5 RS |
1479 | extra_string = extra_augmentation_string_bytes (ent); |
1480 | extra_data = extra_augmentation_data_bytes (ent); | |
1481 | ||
65765700 JJ |
1482 | /* Skip length, id and version. */ |
1483 | buf += 9; | |
f075ee0c AM |
1484 | aug = (char *) buf; |
1485 | buf += strlen (aug) + 1; | |
2c42be65 RS |
1486 | skip_leb128 (&buf, end); |
1487 | skip_leb128 (&buf, end); | |
1488 | skip_leb128 (&buf, end); | |
65765700 JJ |
1489 | if (*aug == 'z') |
1490 | { | |
353057a5 RS |
1491 | /* The uleb128 will always be a single byte for the kind |
1492 | of augmentation strings that we're prepared to handle. */ | |
1493 | *buf++ += extra_data; | |
65765700 JJ |
1494 | aug++; |
1495 | } | |
1496 | ||
353057a5 RS |
1497 | /* Make room for the new augmentation string and data bytes. */ |
1498 | memmove (buf + extra_string + extra_data, buf, end - buf); | |
f075ee0c | 1499 | memmove (aug + extra_string, aug, buf - (bfd_byte *) aug); |
353057a5 | 1500 | buf += extra_string; |
2c42be65 | 1501 | end += extra_string + extra_data; |
353057a5 RS |
1502 | |
1503 | if (ent->add_augmentation_size) | |
1504 | { | |
1505 | *aug++ = 'z'; | |
1506 | *buf++ = extra_data - 1; | |
1507 | } | |
6b2cc140 | 1508 | if (ent->u.cie.add_fde_encoding) |
353057a5 RS |
1509 | { |
1510 | BFD_ASSERT (action & 1); | |
1511 | *aug++ = 'R'; | |
30af5962 | 1512 | *buf++ = make_pc_relative (DW_EH_PE_absptr, ptr_size); |
353057a5 RS |
1513 | action &= ~1; |
1514 | } | |
1515 | ||
9e2a4898 | 1516 | while (action) |
65765700 JJ |
1517 | switch (*aug++) |
1518 | { | |
1519 | case 'L': | |
9e2a4898 JJ |
1520 | if (action & 2) |
1521 | { | |
fda3ecf2 | 1522 | BFD_ASSERT (*buf == ent->lsda_encoding); |
30af5962 | 1523 | *buf = make_pc_relative (*buf, ptr_size); |
9e2a4898 JJ |
1524 | action &= ~2; |
1525 | } | |
65765700 JJ |
1526 | buf++; |
1527 | break; | |
1528 | case 'P': | |
18e04883 | 1529 | if (ent->u.cie.make_per_encoding_relative) |
a10917ef | 1530 | *buf = make_pc_relative (*buf, ptr_size); |
65765700 | 1531 | per_encoding = *buf++; |
3472e2e9 | 1532 | per_width = get_DW_EH_PE_width (per_encoding, ptr_size); |
65765700 | 1533 | BFD_ASSERT (per_width != 0); |
09ae86c2 | 1534 | BFD_ASSERT (((per_encoding & 0x70) == DW_EH_PE_pcrel) |
6b2cc140 | 1535 | == ent->u.cie.per_encoding_relative); |
18e04883 | 1536 | if ((per_encoding & 0x70) == DW_EH_PE_aligned) |
65765700 JJ |
1537 | buf = (contents |
1538 | + ((buf - contents + per_width - 1) | |
1539 | & ~((bfd_size_type) per_width - 1))); | |
09ae86c2 JJ |
1540 | if (action & 4) |
1541 | { | |
fda3ecf2 AM |
1542 | bfd_vma val; |
1543 | ||
1544 | val = read_value (abfd, buf, per_width, | |
1545 | get_DW_EH_PE_signed (per_encoding)); | |
18e04883 RS |
1546 | if (ent->u.cie.make_per_encoding_relative) |
1547 | val -= (sec->output_section->vma | |
1548 | + sec->output_offset | |
1549 | + (buf - contents)); | |
1550 | else | |
1551 | { | |
1552 | val += (bfd_vma) ent->offset - ent->new_offset; | |
1553 | val -= extra_string + extra_data; | |
1554 | } | |
fda3ecf2 | 1555 | write_value (abfd, buf, val, per_width); |
09ae86c2 JJ |
1556 | action &= ~4; |
1557 | } | |
65765700 JJ |
1558 | buf += per_width; |
1559 | break; | |
9e2a4898 JJ |
1560 | case 'R': |
1561 | if (action & 1) | |
1562 | { | |
fda3ecf2 | 1563 | BFD_ASSERT (*buf == ent->fde_encoding); |
30af5962 | 1564 | *buf = make_pc_relative (*buf, ptr_size); |
9e2a4898 JJ |
1565 | action &= ~1; |
1566 | } | |
1567 | buf++; | |
1568 | break; | |
63752a75 JJ |
1569 | case 'S': |
1570 | break; | |
65765700 JJ |
1571 | default: |
1572 | BFD_FAIL (); | |
1573 | } | |
65765700 JJ |
1574 | } |
1575 | } | |
353057a5 | 1576 | else |
65765700 JJ |
1577 | { |
1578 | /* FDE */ | |
fda3ecf2 | 1579 | bfd_vma value, address; |
9e2a4898 | 1580 | unsigned int width; |
ac685e6a | 1581 | bfd_byte *start; |
155eaaa0 | 1582 | struct eh_cie_fde *cie; |
65765700 | 1583 | |
b34976b6 | 1584 | /* Skip length. */ |
155eaaa0 | 1585 | cie = ent->u.fde.cie_inf; |
65765700 | 1586 | buf += 4; |
fc802241 RS |
1587 | value = ((ent->new_offset + sec->output_offset + 4) |
1588 | - (cie->new_offset + cie->u.cie.u.sec->output_offset)); | |
fda3ecf2 | 1589 | bfd_put_32 (abfd, value, buf); |
65765700 | 1590 | buf += 4; |
fda3ecf2 AM |
1591 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); |
1592 | value = read_value (abfd, buf, width, | |
1593 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
1594 | address = value; | |
9e2a4898 | 1595 | if (value) |
65765700 | 1596 | { |
18e04883 | 1597 | switch (ent->fde_encoding & 0x70) |
9e2a4898 | 1598 | { |
9e2a4898 JJ |
1599 | case DW_EH_PE_textrel: |
1600 | BFD_ASSERT (hdr_info == NULL); | |
1601 | break; | |
1602 | case DW_EH_PE_datarel: | |
1603 | { | |
cd9e734e AM |
1604 | switch (abfd->arch_info->arch) |
1605 | { | |
1606 | case bfd_arch_ia64: | |
1607 | BFD_ASSERT (elf_gp (abfd) != 0); | |
1608 | address += elf_gp (abfd); | |
1609 | break; | |
1610 | default: | |
1611 | (*info->callbacks->einfo) | |
1612 | (_("%P: DW_EH_PE_datarel unspecified" | |
1613 | " for this architecture.\n")); | |
1614 | /* Fall thru */ | |
1615 | case bfd_arch_frv: | |
1616 | case bfd_arch_i386: | |
1617 | BFD_ASSERT (htab->hgot != NULL | |
1618 | && ((htab->hgot->root.type | |
1619 | == bfd_link_hash_defined) | |
1620 | || (htab->hgot->root.type | |
1621 | == bfd_link_hash_defweak))); | |
1622 | address | |
1623 | += (htab->hgot->root.u.def.value | |
1624 | + htab->hgot->root.u.def.section->output_offset | |
1625 | + (htab->hgot->root.u.def.section->output_section | |
1626 | ->vma)); | |
1627 | break; | |
1628 | } | |
9e2a4898 JJ |
1629 | } |
1630 | break; | |
1631 | case DW_EH_PE_pcrel: | |
9c47c4c1 | 1632 | value += (bfd_vma) ent->offset - ent->new_offset; |
fc802241 RS |
1633 | address += (sec->output_section->vma |
1634 | + sec->output_offset | |
1635 | + ent->offset + 8); | |
9e2a4898 JJ |
1636 | break; |
1637 | } | |
6b2cc140 | 1638 | if (ent->make_relative) |
fc802241 RS |
1639 | value -= (sec->output_section->vma |
1640 | + sec->output_offset | |
1641 | + ent->new_offset + 8); | |
9e2a4898 | 1642 | write_value (abfd, buf, value, width); |
65765700 JJ |
1643 | } |
1644 | ||
ac685e6a JJ |
1645 | start = buf; |
1646 | ||
65765700 JJ |
1647 | if (hdr_info) |
1648 | { | |
cd9e734e AM |
1649 | /* The address calculation may overflow, giving us a |
1650 | value greater than 4G on a 32-bit target when | |
1651 | dwarf_vma is 64-bit. */ | |
1652 | if (sizeof (address) > 4 && ptr_size == 4) | |
1653 | address &= 0xffffffff; | |
65765700 JJ |
1654 | hdr_info->array[hdr_info->array_count].initial_loc = address; |
1655 | hdr_info->array[hdr_info->array_count++].fde | |
fc802241 RS |
1656 | = (sec->output_section->vma |
1657 | + sec->output_offset | |
1658 | + ent->new_offset); | |
65765700 | 1659 | } |
9e2a4898 | 1660 | |
18e04883 | 1661 | if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel |
9f4b847e | 1662 | || cie->u.cie.make_lsda_relative) |
9e2a4898 | 1663 | { |
fda3ecf2 AM |
1664 | buf += ent->lsda_offset; |
1665 | width = get_DW_EH_PE_width (ent->lsda_encoding, ptr_size); | |
84f97cb6 | 1666 | value = read_value (abfd, buf, width, |
fda3ecf2 | 1667 | get_DW_EH_PE_signed (ent->lsda_encoding)); |
9e2a4898 JJ |
1668 | if (value) |
1669 | { | |
18e04883 | 1670 | if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel) |
9c47c4c1 | 1671 | value += (bfd_vma) ent->offset - ent->new_offset; |
9f4b847e | 1672 | else if (cie->u.cie.make_lsda_relative) |
fc802241 RS |
1673 | value -= (sec->output_section->vma |
1674 | + sec->output_offset | |
1675 | + ent->new_offset + 8 + ent->lsda_offset); | |
9e2a4898 JJ |
1676 | write_value (abfd, buf, value, width); |
1677 | } | |
1678 | } | |
6b2cc140 | 1679 | else if (ent->add_augmentation_size) |
353057a5 RS |
1680 | { |
1681 | /* Skip the PC and length and insert a zero byte for the | |
1682 | augmentation size. */ | |
1683 | buf += width * 2; | |
1684 | memmove (buf + 1, buf, end - buf); | |
1685 | *buf = 0; | |
1686 | } | |
ac685e6a JJ |
1687 | |
1688 | if (ent->set_loc) | |
1689 | { | |
1690 | /* Adjust DW_CFA_set_loc. */ | |
91d6fa6a | 1691 | unsigned int cnt; |
ac685e6a JJ |
1692 | bfd_vma new_offset; |
1693 | ||
1694 | width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); | |
1695 | new_offset = ent->new_offset + 8 | |
1696 | + extra_augmentation_string_bytes (ent) | |
1697 | + extra_augmentation_data_bytes (ent); | |
1698 | ||
1699 | for (cnt = 1; cnt <= ent->set_loc[0]; cnt++) | |
1700 | { | |
ac685e6a JJ |
1701 | buf = start + ent->set_loc[cnt]; |
1702 | ||
1703 | value = read_value (abfd, buf, width, | |
1704 | get_DW_EH_PE_signed (ent->fde_encoding)); | |
1705 | if (!value) | |
1706 | continue; | |
1707 | ||
18e04883 | 1708 | if ((ent->fde_encoding & 0x70) == DW_EH_PE_pcrel) |
9c47c4c1 | 1709 | value += (bfd_vma) ent->offset + 8 - new_offset; |
6b2cc140 | 1710 | if (ent->make_relative) |
fc802241 RS |
1711 | value -= (sec->output_section->vma |
1712 | + sec->output_offset | |
1713 | + new_offset + ent->set_loc[cnt]); | |
ac685e6a JJ |
1714 | write_value (abfd, buf, value, width); |
1715 | } | |
1716 | } | |
65765700 | 1717 | } |
65765700 JJ |
1718 | } |
1719 | ||
a34a056a L |
1720 | /* We don't align the section to its section alignment since the |
1721 | runtime library only expects all CIE/FDE records aligned at | |
4e591bc1 | 1722 | the pointer size. _bfd_elf_discard_section_eh_frame should |
a34a056a L |
1723 | have padded CIE/FDE records to multiple of pointer size with |
1724 | size_of_output_cie_fde. */ | |
1725 | if ((sec->size % ptr_size) != 0) | |
1726 | abort (); | |
a5eb27e6 | 1727 | |
5dabe785 | 1728 | /* FIXME: octets_per_byte. */ |
65765700 | 1729 | return bfd_set_section_contents (abfd, sec->output_section, |
3472e2e9 AM |
1730 | contents, (file_ptr) sec->output_offset, |
1731 | sec->size); | |
65765700 JJ |
1732 | } |
1733 | ||
1734 | /* Helper function used to sort .eh_frame_hdr search table by increasing | |
1735 | VMA of FDE initial location. */ | |
1736 | ||
1737 | static int | |
c39a58e6 | 1738 | vma_compare (const void *a, const void *b) |
65765700 | 1739 | { |
a50b1753 NC |
1740 | const struct eh_frame_array_ent *p = (const struct eh_frame_array_ent *) a; |
1741 | const struct eh_frame_array_ent *q = (const struct eh_frame_array_ent *) b; | |
65765700 JJ |
1742 | if (p->initial_loc > q->initial_loc) |
1743 | return 1; | |
1744 | if (p->initial_loc < q->initial_loc) | |
1745 | return -1; | |
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | /* Write out .eh_frame_hdr section. This must be called after | |
1750 | _bfd_elf_write_section_eh_frame has been called on all input | |
1751 | .eh_frame sections. | |
1752 | .eh_frame_hdr format: | |
1753 | ubyte version (currently 1) | |
1754 | ubyte eh_frame_ptr_enc (DW_EH_PE_* encoding of pointer to start of | |
1755 | .eh_frame section) | |
1756 | ubyte fde_count_enc (DW_EH_PE_* encoding of total FDE count | |
1757 | number (or DW_EH_PE_omit if there is no | |
1758 | binary search table computed)) | |
1759 | ubyte table_enc (DW_EH_PE_* encoding of binary search table, | |
1760 | or DW_EH_PE_omit if not present. | |
1761 | DW_EH_PE_datarel is using address of | |
1762 | .eh_frame_hdr section start as base) | |
1763 | [encoded] eh_frame_ptr (pointer to start of .eh_frame section) | |
1764 | optionally followed by: | |
1765 | [encoded] fde_count (total number of FDEs in .eh_frame section) | |
1766 | fde_count x [encoded] initial_loc, fde | |
1767 | (array of encoded pairs containing | |
1768 | FDE initial_location field and FDE address, | |
5ed6aba4 | 1769 | sorted by increasing initial_loc). */ |
65765700 | 1770 | |
b34976b6 | 1771 | bfd_boolean |
c39a58e6 | 1772 | _bfd_elf_write_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) |
65765700 | 1773 | { |
126495ed | 1774 | struct elf_link_hash_table *htab; |
65765700 | 1775 | struct eh_frame_hdr_info *hdr_info; |
126495ed | 1776 | asection *sec; |
9f7c3e5e | 1777 | bfd_boolean retval = TRUE; |
65765700 | 1778 | |
126495ed AM |
1779 | htab = elf_hash_table (info); |
1780 | hdr_info = &htab->eh_info; | |
1781 | sec = hdr_info->hdr_sec; | |
65765700 | 1782 | |
9f7c3e5e | 1783 | if (info->eh_frame_hdr && sec != NULL) |
5ed6aba4 | 1784 | { |
9f7c3e5e AM |
1785 | bfd_byte *contents; |
1786 | asection *eh_frame_sec; | |
1787 | bfd_size_type size; | |
1788 | bfd_vma encoded_eh_frame; | |
1789 | ||
1790 | size = EH_FRAME_HDR_SIZE; | |
1791 | if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) | |
1792 | size += 4 + hdr_info->fde_count * 8; | |
1793 | contents = (bfd_byte *) bfd_malloc (size); | |
1794 | if (contents == NULL) | |
1795 | return FALSE; | |
65765700 | 1796 | |
9f7c3e5e AM |
1797 | eh_frame_sec = bfd_get_section_by_name (abfd, ".eh_frame"); |
1798 | if (eh_frame_sec == NULL) | |
1799 | { | |
1800 | free (contents); | |
1801 | return FALSE; | |
1802 | } | |
ec3391e7 | 1803 | |
9f7c3e5e AM |
1804 | memset (contents, 0, EH_FRAME_HDR_SIZE); |
1805 | /* Version. */ | |
1806 | contents[0] = 1; | |
1807 | /* .eh_frame offset. */ | |
1808 | contents[1] = get_elf_backend_data (abfd)->elf_backend_encode_eh_address | |
1809 | (abfd, info, eh_frame_sec, 0, sec, 4, &encoded_eh_frame); | |
ec3391e7 | 1810 | |
9f7c3e5e AM |
1811 | if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) |
1812 | { | |
1813 | /* FDE count encoding. */ | |
1814 | contents[2] = DW_EH_PE_udata4; | |
1815 | /* Search table encoding. */ | |
1816 | contents[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4; | |
1817 | } | |
1818 | else | |
1819 | { | |
1820 | contents[2] = DW_EH_PE_omit; | |
1821 | contents[3] = DW_EH_PE_omit; | |
1822 | } | |
1823 | bfd_put_32 (abfd, encoded_eh_frame, contents + 4); | |
65765700 | 1824 | |
9f7c3e5e | 1825 | if (contents[2] != DW_EH_PE_omit) |
65765700 | 1826 | { |
9f7c3e5e AM |
1827 | unsigned int i; |
1828 | ||
1829 | bfd_put_32 (abfd, hdr_info->fde_count, contents + EH_FRAME_HDR_SIZE); | |
1830 | qsort (hdr_info->array, hdr_info->fde_count, | |
1831 | sizeof (*hdr_info->array), vma_compare); | |
1832 | for (i = 0; i < hdr_info->fde_count; i++) | |
1833 | { | |
1834 | bfd_put_32 (abfd, | |
1835 | hdr_info->array[i].initial_loc | |
1836 | - sec->output_section->vma, | |
1837 | contents + EH_FRAME_HDR_SIZE + i * 8 + 4); | |
1838 | bfd_put_32 (abfd, | |
1839 | hdr_info->array[i].fde - sec->output_section->vma, | |
1840 | contents + EH_FRAME_HDR_SIZE + i * 8 + 8); | |
1841 | } | |
65765700 | 1842 | } |
65765700 | 1843 | |
9f7c3e5e AM |
1844 | /* FIXME: octets_per_byte. */ |
1845 | retval = bfd_set_section_contents (abfd, sec->output_section, contents, | |
1846 | (file_ptr) sec->output_offset, | |
1847 | sec->size); | |
1848 | free (contents); | |
1849 | } | |
1850 | if (hdr_info->array != NULL) | |
1851 | free (hdr_info->array); | |
5ed6aba4 | 1852 | return retval; |
65765700 | 1853 | } |
ec3391e7 | 1854 | |
8c946ed5 RS |
1855 | /* Return the width of FDE addresses. This is the default implementation. */ |
1856 | ||
1857 | unsigned int | |
1858 | _bfd_elf_eh_frame_address_size (bfd *abfd, asection *sec ATTRIBUTE_UNUSED) | |
1859 | { | |
1860 | return elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64 ? 8 : 4; | |
1861 | } | |
1862 | ||
ec3391e7 AO |
1863 | /* Decide whether we can use a PC-relative encoding within the given |
1864 | EH frame section. This is the default implementation. */ | |
1865 | ||
1866 | bfd_boolean | |
1867 | _bfd_elf_can_make_relative (bfd *input_bfd ATTRIBUTE_UNUSED, | |
1868 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
1869 | asection *eh_frame_section ATTRIBUTE_UNUSED) | |
1870 | { | |
1871 | return TRUE; | |
1872 | } | |
1873 | ||
1874 | /* Select an encoding for the given address. Preference is given to | |
1875 | PC-relative addressing modes. */ | |
1876 | ||
1877 | bfd_byte | |
1878 | _bfd_elf_encode_eh_address (bfd *abfd ATTRIBUTE_UNUSED, | |
1879 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
1880 | asection *osec, bfd_vma offset, | |
1881 | asection *loc_sec, bfd_vma loc_offset, | |
1882 | bfd_vma *encoded) | |
1883 | { | |
1884 | *encoded = osec->vma + offset - | |
1885 | (loc_sec->output_section->vma + loc_sec->output_offset + loc_offset); | |
1886 | return DW_EH_PE_pcrel | DW_EH_PE_sdata4; | |
1887 | } |