/src/binutils-gdb/gas/dw2gencfi.c
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1 | | /* dw2gencfi.c - Support for generating Dwarf2 CFI information. |
2 | | Copyright (C) 2003-2024 Free Software Foundation, Inc. |
3 | | Contributed by Michal Ludvig <mludvig@suse.cz> |
4 | | |
5 | | This file is part of GAS, the GNU Assembler. |
6 | | |
7 | | GAS is free software; you can redistribute it and/or modify |
8 | | it under the terms of the GNU General Public License as published by |
9 | | the Free Software Foundation; either version 3, or (at your option) |
10 | | any later version. |
11 | | |
12 | | GAS is distributed in the hope that it will be useful, |
13 | | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | | GNU General Public License for more details. |
16 | | |
17 | | You should have received a copy of the GNU General Public License |
18 | | along with GAS; see the file COPYING. If not, write to the Free |
19 | | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
20 | | 02110-1301, USA. */ |
21 | | |
22 | | #include "as.h" |
23 | | #include "dw2gencfi.h" |
24 | | #include "subsegs.h" |
25 | | #include "dwarf2dbg.h" |
26 | | #include "gen-sframe.h" |
27 | | |
28 | | #ifdef TARGET_USE_CFIPOP |
29 | | |
30 | | /* By default, use difference expressions if DIFF_EXPR_OK is defined. */ |
31 | | #ifndef CFI_DIFF_EXPR_OK |
32 | | # ifdef DIFF_EXPR_OK |
33 | | # define CFI_DIFF_EXPR_OK 1 |
34 | | # else |
35 | | # define CFI_DIFF_EXPR_OK 0 |
36 | | # endif |
37 | | #endif |
38 | | |
39 | | #ifndef CFI_DIFF_LSDA_OK |
40 | | #define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK |
41 | | #endif |
42 | | |
43 | | #if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0 |
44 | | # error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK" |
45 | | #endif |
46 | | |
47 | | /* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field |
48 | | of the CIE. Default to 1 if not otherwise specified. */ |
49 | | #ifndef DWARF2_LINE_MIN_INSN_LENGTH |
50 | 722 | #define DWARF2_LINE_MIN_INSN_LENGTH 1 |
51 | | #endif |
52 | | |
53 | | /* By default, use 32-bit relocations from .eh_frame into .text. */ |
54 | | #ifndef DWARF2_FDE_RELOC_SIZE |
55 | 27.5k | #define DWARF2_FDE_RELOC_SIZE 4 |
56 | | #endif |
57 | | |
58 | | /* By default, use a read-only .eh_frame section. */ |
59 | | #ifndef DWARF2_EH_FRAME_READ_ONLY |
60 | 722 | #define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY |
61 | | #endif |
62 | | |
63 | | #ifndef EH_FRAME_ALIGNMENT |
64 | 1.44k | #define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2) |
65 | | #endif |
66 | | |
67 | 29.7k | #define EH_FRAME_LINKONCE (SUPPORT_FRAME_LINKONCE || compact_eh \ |
68 | 29.7k | || TARGET_MULTIPLE_EH_FRAME_SECTIONS) |
69 | | |
70 | | #ifndef DWARF2_FORMAT |
71 | 27.5k | #define DWARF2_FORMAT(SEC) dwarf2_format_32bit |
72 | | #endif |
73 | | |
74 | | #ifndef DWARF2_ADDR_SIZE |
75 | | #define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) |
76 | | #endif |
77 | | |
78 | | #if MULTIPLE_FRAME_SECTIONS |
79 | | #define CUR_SEG(structp) structp->cur_seg |
80 | | #define SET_CUR_SEG(structp, seg) structp->cur_seg = seg |
81 | | #define HANDLED(structp) structp->handled |
82 | | #define SET_HANDLED(structp, val) structp->handled = val |
83 | | #else |
84 | 55.1k | #define CUR_SEG(structp) NULL |
85 | 908 | #define SET_CUR_SEG(structp, seg) (void) (0 && seg) |
86 | 0 | #define HANDLED(structp) 0 |
87 | 62 | #define SET_HANDLED(structp, val) (void) (0 && val) |
88 | | #endif |
89 | | |
90 | | #ifndef tc_cfi_reloc_for_encoding |
91 | 26.8k | #define tc_cfi_reloc_for_encoding(e) BFD_RELOC_NONE |
92 | | #endif |
93 | | |
94 | | /* Targets which support SFrame format will define this and return true. */ |
95 | | #ifndef support_sframe_p |
96 | | # define support_sframe_p() false |
97 | | #endif |
98 | | |
99 | | /* Private segment collection list. */ |
100 | | struct dwcfi_seg_list |
101 | | { |
102 | | segT seg; |
103 | | int subseg; |
104 | | char * seg_name; |
105 | | }; |
106 | | |
107 | | #ifdef SUPPORT_COMPACT_EH |
108 | | static bool compact_eh; |
109 | | #else |
110 | | #define compact_eh 0 |
111 | | #endif |
112 | | |
113 | | static htab_t dwcfi_hash; |
114 | | |
115 | | /* Emit a single byte into the current segment. */ |
116 | | |
117 | | static inline void |
118 | | out_one (int byte) |
119 | 5.77k | { |
120 | 5.77k | FRAG_APPEND_1_CHAR (byte); |
121 | 5.77k | } |
122 | | |
123 | | /* Emit a two-byte word into the current segment. */ |
124 | | |
125 | | static inline void |
126 | | out_two (int data) |
127 | 0 | { |
128 | 0 | md_number_to_chars (frag_more (2), data, 2); |
129 | 0 | } |
130 | | |
131 | | /* Emit a four byte word into the current segment. */ |
132 | | |
133 | | static inline void |
134 | | out_four (int data) |
135 | 722 | { |
136 | 722 | md_number_to_chars (frag_more (4), data, 4); |
137 | 722 | } |
138 | | |
139 | | /* Emit an unsigned "little-endian base 128" number. */ |
140 | | |
141 | | static void |
142 | | out_uleb128 (addressT value) |
143 | 30.4k | { |
144 | 30.4k | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); |
145 | 30.4k | } |
146 | | |
147 | | /* Emit an unsigned "little-endian base 128" number. */ |
148 | | |
149 | | static void |
150 | | out_sleb128 (offsetT value) |
151 | 722 | { |
152 | 722 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); |
153 | 722 | } |
154 | | |
155 | | static unsigned int |
156 | | encoding_size (unsigned char encoding) |
157 | 54.3k | { |
158 | 54.3k | if (encoding == DW_EH_PE_omit) |
159 | 54.3k | return 0; |
160 | 0 | switch (encoding & 0x7) |
161 | 0 | { |
162 | 0 | case 0: |
163 | 0 | return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4; |
164 | 0 | case DW_EH_PE_udata2: |
165 | 0 | return 2; |
166 | 0 | case DW_EH_PE_udata4: |
167 | 0 | return 4; |
168 | 0 | case DW_EH_PE_udata8: |
169 | 0 | return 8; |
170 | 0 | default: |
171 | 0 | abort (); |
172 | 0 | } |
173 | 0 | } |
174 | | |
175 | | /* Emit expression EXP in ENCODING. If EMIT_ENCODING is true, first |
176 | | emit a byte containing ENCODING. */ |
177 | | |
178 | | static void |
179 | | emit_expr_encoded (expressionS *exp, int encoding, bool emit_encoding) |
180 | 27.5k | { |
181 | 27.5k | unsigned int size = encoding_size (encoding); |
182 | 27.5k | bfd_reloc_code_real_type code; |
183 | | |
184 | 27.5k | if (encoding == DW_EH_PE_omit) |
185 | 27.5k | return; |
186 | | |
187 | 0 | if (emit_encoding) |
188 | 0 | out_one (encoding); |
189 | |
|
190 | 0 | code = tc_cfi_reloc_for_encoding (encoding); |
191 | 0 | if (code != BFD_RELOC_NONE) |
192 | 0 | { |
193 | 0 | reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code); |
194 | 0 | char *p = frag_more (size); |
195 | 0 | gas_assert (size == (unsigned) howto->bitsize / 8); |
196 | 0 | md_number_to_chars (p, 0, size); |
197 | 0 | fix_new (frag_now, p - frag_now->fr_literal, size, exp->X_add_symbol, |
198 | 0 | exp->X_add_number, howto->pc_relative, code); |
199 | 0 | } |
200 | 0 | else if ((encoding & 0x70) == DW_EH_PE_pcrel) |
201 | 0 | { |
202 | 0 | #if CFI_DIFF_EXPR_OK |
203 | 0 | expressionS tmp = *exp; |
204 | 0 | tmp.X_op = O_subtract; |
205 | 0 | tmp.X_op_symbol = symbol_temp_new_now (); |
206 | 0 | emit_expr (&tmp, size); |
207 | | #elif defined (tc_cfi_emit_pcrel_expr) |
208 | | tc_cfi_emit_pcrel_expr (exp, size); |
209 | | #else |
210 | | abort (); |
211 | | #endif |
212 | 0 | } |
213 | 0 | else |
214 | 0 | emit_expr (exp, size); |
215 | 0 | } |
216 | | |
217 | | /* Build based on segment the derived .debug_... |
218 | | segment name containing origin segment's postfix name part. */ |
219 | | |
220 | | static char * |
221 | | get_debugseg_name (segT seg, const char *base_name) |
222 | 0 | { |
223 | 0 | const char * name; |
224 | 0 | const char * dollar; |
225 | 0 | const char * dot; |
226 | |
|
227 | 0 | if (!seg |
228 | 0 | || (name = bfd_section_name (seg)) == NULL |
229 | 0 | || *name == 0) |
230 | 0 | return notes_strdup (base_name); |
231 | | |
232 | 0 | dollar = strchr (name, '$'); |
233 | 0 | dot = strchr (name + 1, '.'); |
234 | |
|
235 | 0 | if (!dollar && !dot) |
236 | 0 | { |
237 | 0 | if (!strcmp (base_name, ".eh_frame_entry") |
238 | 0 | && strcmp (name, ".text") != 0) |
239 | 0 | return notes_concat (base_name, ".", name, NULL); |
240 | | |
241 | 0 | name = ""; |
242 | 0 | } |
243 | 0 | else if (!dollar) |
244 | 0 | name = dot; |
245 | 0 | else if (!dot) |
246 | 0 | name = dollar; |
247 | 0 | else if (dot < dollar) |
248 | 0 | name = dot; |
249 | 0 | else |
250 | 0 | name = dollar; |
251 | | |
252 | 0 | return notes_concat (base_name, name, NULL); |
253 | 0 | } |
254 | | |
255 | | /* Allocate a dwcfi_seg_list structure. */ |
256 | | |
257 | | static struct dwcfi_seg_list * |
258 | | alloc_debugseg_item (segT seg, int subseg, char *name) |
259 | 0 | { |
260 | 0 | struct dwcfi_seg_list *r; |
261 | |
|
262 | 0 | r = notes_alloc (sizeof (*r) + strlen (name)); |
263 | 0 | r->seg = seg; |
264 | 0 | r->subseg = subseg; |
265 | 0 | r->seg_name = name; |
266 | 0 | return r; |
267 | 0 | } |
268 | | |
269 | | static segT |
270 | | is_now_linkonce_segment (void) |
271 | 0 | { |
272 | 0 | if (compact_eh) |
273 | 0 | return now_seg; |
274 | 0 |
|
275 | 0 | if (TARGET_MULTIPLE_EH_FRAME_SECTIONS) |
276 | 0 | return now_seg; |
277 | 0 |
|
278 | 0 | if ((bfd_section_flags (now_seg) |
279 | 0 | & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD |
280 | 0 | | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE |
281 | 0 | | SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0) |
282 | 0 | return now_seg; |
283 | 0 | return NULL; |
284 | 0 | } |
285 | | |
286 | | /* Generate debug... segment with same linkonce properties |
287 | | of based segment. */ |
288 | | |
289 | | static segT |
290 | | make_debug_seg (segT cseg, char *name, int sflags) |
291 | 0 | { |
292 | 0 | segT save_seg = now_seg; |
293 | 0 | int save_subseg = now_subseg; |
294 | 0 | segT r; |
295 | 0 | flagword flags; |
296 | |
|
297 | 0 | r = subseg_new (name, 0); |
298 | | |
299 | | /* Check if code segment is marked as linked once. */ |
300 | 0 | if (!cseg) |
301 | 0 | flags = 0; |
302 | 0 | else |
303 | 0 | flags = (bfd_section_flags (cseg) |
304 | 0 | & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD |
305 | 0 | | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE |
306 | 0 | | SEC_LINK_DUPLICATES_SAME_CONTENTS)); |
307 | | |
308 | | /* Add standard section flags. */ |
309 | 0 | flags |= sflags; |
310 | | |
311 | | /* Apply possibly linked once flags to new generated segment, too. */ |
312 | 0 | if (!bfd_set_section_flags (r, flags)) |
313 | 0 | as_bad (_("bfd_set_section_flags: %s"), |
314 | 0 | bfd_errmsg (bfd_get_error ())); |
315 | | |
316 | | /* Restore to previous segment. */ |
317 | 0 | if (save_seg != NULL) |
318 | 0 | subseg_set (save_seg, save_subseg); |
319 | 0 | return r; |
320 | 0 | } |
321 | | |
322 | | static struct dwcfi_seg_list * |
323 | | dwcfi_hash_find (char *name) |
324 | 0 | { |
325 | 0 | return (struct dwcfi_seg_list *) str_hash_find (dwcfi_hash, name); |
326 | 0 | } |
327 | | |
328 | | static struct dwcfi_seg_list * |
329 | | dwcfi_hash_find_or_make (segT cseg, const char *base_name, int flags) |
330 | 0 | { |
331 | 0 | struct dwcfi_seg_list *item; |
332 | 0 | char *name; |
333 | | |
334 | | /* Initialize dwcfi_hash once. */ |
335 | 0 | if (!dwcfi_hash) |
336 | 0 | dwcfi_hash = str_htab_create (); |
337 | |
|
338 | 0 | name = get_debugseg_name (cseg, base_name); |
339 | |
|
340 | 0 | item = dwcfi_hash_find (name); |
341 | 0 | if (!item) |
342 | 0 | { |
343 | 0 | item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name); |
344 | |
|
345 | 0 | str_hash_insert (dwcfi_hash, item->seg_name, item, 0); |
346 | 0 | } |
347 | 0 | else |
348 | 0 | notes_free (name); |
349 | |
|
350 | 0 | return item; |
351 | 0 | } |
352 | | |
353 | | /* ??? Share this with dwarf2cfg.c. */ |
354 | | #ifndef TC_DWARF2_EMIT_OFFSET |
355 | 0 | #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
356 | | |
357 | | /* Create an offset to .dwarf2_*. */ |
358 | | |
359 | | static void |
360 | | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
361 | 0 | { |
362 | 0 | expressionS exp; |
363 | |
|
364 | 0 | exp.X_op = O_symbol; |
365 | 0 | exp.X_add_symbol = symbol; |
366 | 0 | exp.X_add_number = 0; |
367 | 0 | emit_expr (&exp, size); |
368 | 0 | } |
369 | | #endif |
370 | | |
371 | | struct cfi_escape_data |
372 | | { |
373 | | struct cfi_escape_data *next; |
374 | | expressionS exp; |
375 | | }; |
376 | | |
377 | | struct cie_entry |
378 | | { |
379 | | struct cie_entry *next; |
380 | | #if MULTIPLE_FRAME_SECTIONS |
381 | | segT cur_seg; |
382 | | #endif |
383 | | symbolS *start_address; |
384 | | unsigned int return_column; |
385 | | unsigned int signal_frame; |
386 | | unsigned char fde_encoding; |
387 | | unsigned char per_encoding; |
388 | | unsigned char lsda_encoding; |
389 | | expressionS personality; |
390 | | #ifdef tc_cie_entry_extras |
391 | | tc_cie_entry_extras |
392 | | #endif |
393 | | struct cfi_insn_data *first, *last; |
394 | | }; |
395 | | |
396 | | /* List of FDE entries. */ |
397 | | |
398 | | struct fde_entry *all_fde_data; |
399 | | static struct fde_entry **last_fde_data = &all_fde_data; |
400 | | |
401 | | /* List of CIEs so that they could be reused. */ |
402 | | static struct cie_entry *cie_root; |
403 | | |
404 | | /* Construct a new FDE structure and add it to the end of the fde list. */ |
405 | | |
406 | | static struct fde_entry * |
407 | | alloc_fde_entry (void) |
408 | 62 | { |
409 | 62 | struct fde_entry *fde = XCNEW (struct fde_entry); |
410 | | |
411 | 62 | frchain_now->frch_cfi_data = XCNEW (struct frch_cfi_data); |
412 | 62 | frchain_now->frch_cfi_data->cur_fde_data = fde; |
413 | 62 | *last_fde_data = fde; |
414 | 62 | last_fde_data = &fde->next; |
415 | 62 | SET_CUR_SEG (fde, is_now_linkonce_segment ()); |
416 | 62 | SET_HANDLED (fde, 0); |
417 | 62 | fde->last = &fde->data; |
418 | 62 | fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN; |
419 | 62 | fde->per_encoding = DW_EH_PE_omit; |
420 | 62 | fde->lsda_encoding = DW_EH_PE_omit; |
421 | 62 | fde->eh_header_type = EH_COMPACT_UNKNOWN; |
422 | | #ifdef tc_fde_entry_init_extra |
423 | | tc_fde_entry_init_extra (fde) |
424 | | #endif |
425 | | |
426 | 62 | return fde; |
427 | 62 | } |
428 | | |
429 | | /* The following functions are available for a backend to construct its |
430 | | own unwind information, usually from legacy unwind directives. */ |
431 | | |
432 | | /* Construct a new INSN structure and add it to the end of the insn list |
433 | | for the currently active FDE. */ |
434 | | |
435 | | static bool cfi_sections_set = false; |
436 | | static int cfi_sections = CFI_EMIT_eh_frame; |
437 | | int all_cfi_sections = 0; |
438 | | static struct fde_entry *last_fde; |
439 | | |
440 | | static struct cfi_insn_data * |
441 | | alloc_cfi_insn_data (void) |
442 | 124 | { |
443 | 124 | struct cfi_insn_data *insn = XCNEW (struct cfi_insn_data); |
444 | 124 | struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data; |
445 | | |
446 | 124 | *cur_fde_data->last = insn; |
447 | 124 | cur_fde_data->last = &insn->next; |
448 | 124 | SET_CUR_SEG (insn, is_now_linkonce_segment ()); |
449 | 124 | return insn; |
450 | 124 | } |
451 | | |
452 | | /* Construct a new FDE structure that begins at LABEL. */ |
453 | | |
454 | | void |
455 | | cfi_new_fde (symbolS *label) |
456 | 62 | { |
457 | 62 | struct fde_entry *fde = alloc_fde_entry (); |
458 | 62 | fde->start_address = label; |
459 | 62 | frchain_now->frch_cfi_data->last_address = label; |
460 | 62 | } |
461 | | |
462 | | /* End the currently open FDE. */ |
463 | | |
464 | | void |
465 | | cfi_end_fde (symbolS *label) |
466 | 0 | { |
467 | 0 | frchain_now->frch_cfi_data->cur_fde_data->end_address = label; |
468 | 0 | free (frchain_now->frch_cfi_data); |
469 | 0 | frchain_now->frch_cfi_data = NULL; |
470 | 0 | } |
471 | | |
472 | | /* Set the last FDE .*/ |
473 | | void |
474 | | cfi_set_last_fde (struct fde_entry *fde) |
475 | 0 | { |
476 | 0 | last_fde = fde; |
477 | 0 | } |
478 | | |
479 | | /* Set the return column for the current FDE. */ |
480 | | |
481 | | void |
482 | | cfi_set_return_column (unsigned regno) |
483 | 0 | { |
484 | 0 | frchain_now->frch_cfi_data->cur_fde_data->return_column = regno; |
485 | 0 | } |
486 | | |
487 | | void |
488 | | cfi_set_sections (void) |
489 | 62 | { |
490 | 62 | all_cfi_sections |= cfi_sections; |
491 | 62 | frchain_now->frch_cfi_data->cur_fde_data->sections = all_cfi_sections; |
492 | 62 | cfi_sections_set = true; |
493 | 62 | } |
494 | | |
495 | | /* Universal functions to store new instructions. */ |
496 | | |
497 | | static void |
498 | | cfi_add_CFA_insn (int insn) |
499 | 0 | { |
500 | 0 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
501 | |
|
502 | 0 | insn_ptr->insn = insn; |
503 | 0 | } |
504 | | |
505 | | static void |
506 | | cfi_add_CFA_insn_reg (int insn, unsigned regno) |
507 | 0 | { |
508 | 0 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
509 | |
|
510 | 0 | insn_ptr->insn = insn; |
511 | 0 | insn_ptr->u.r = regno; |
512 | 0 | } |
513 | | |
514 | | static void |
515 | | cfi_add_CFA_insn_offset (int insn, offsetT offset) |
516 | 0 | { |
517 | 0 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
518 | |
|
519 | 0 | insn_ptr->insn = insn; |
520 | 0 | insn_ptr->u.i = offset; |
521 | 0 | } |
522 | | |
523 | | static void |
524 | | cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2) |
525 | 0 | { |
526 | 0 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
527 | |
|
528 | 0 | insn_ptr->insn = insn; |
529 | 0 | insn_ptr->u.rr.reg1 = reg1; |
530 | 0 | insn_ptr->u.rr.reg2 = reg2; |
531 | 0 | } |
532 | | |
533 | | static void |
534 | | cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset) |
535 | 124 | { |
536 | 124 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
537 | | |
538 | 124 | insn_ptr->insn = insn; |
539 | 124 | insn_ptr->u.ri.reg = regno; |
540 | 124 | insn_ptr->u.ri.offset = offset; |
541 | 124 | } |
542 | | |
543 | | /* Add a CFI insn to advance the PC from the last address to LABEL. */ |
544 | | |
545 | | void |
546 | | cfi_add_advance_loc (symbolS *label) |
547 | 0 | { |
548 | 0 | struct cfi_insn_data *insn = alloc_cfi_insn_data (); |
549 | |
|
550 | 0 | insn->insn = DW_CFA_advance_loc; |
551 | 0 | insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address; |
552 | 0 | insn->u.ll.lab2 = label; |
553 | |
|
554 | 0 | frchain_now->frch_cfi_data->last_address = label; |
555 | 0 | } |
556 | | |
557 | | /* Add a CFI insn to label the current position in the CFI segment. */ |
558 | | |
559 | | void |
560 | | cfi_add_label (const char *name) |
561 | 0 | { |
562 | 0 | unsigned int len = strlen (name) + 1; |
563 | 0 | struct cfi_insn_data *insn = alloc_cfi_insn_data (); |
564 | |
|
565 | 0 | insn->insn = CFI_label; |
566 | 0 | obstack_grow (¬es, name, len); |
567 | 0 | insn->u.sym_name = (char *) obstack_finish (¬es); |
568 | 0 | } |
569 | | |
570 | | /* Add a DW_CFA_offset record to the CFI data. */ |
571 | | |
572 | | void |
573 | | cfi_add_CFA_offset (unsigned regno, offsetT offset) |
574 | 62 | { |
575 | 62 | unsigned int abs_data_align; |
576 | | |
577 | 62 | gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0); |
578 | 62 | cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset); |
579 | | |
580 | 62 | abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 |
581 | 62 | ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT); |
582 | 62 | if (offset % abs_data_align) |
583 | 0 | as_bad (_("register save offset not a multiple of %u"), abs_data_align); |
584 | 62 | } |
585 | | |
586 | | /* Add a DW_CFA_val_offset record to the CFI data. */ |
587 | | |
588 | | void |
589 | | cfi_add_CFA_val_offset (unsigned regno, offsetT offset) |
590 | 0 | { |
591 | 0 | unsigned int abs_data_align; |
592 | |
|
593 | 0 | gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0); |
594 | 0 | cfi_add_CFA_insn_reg_offset (DW_CFA_val_offset, regno, offset); |
595 | |
|
596 | 0 | abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 |
597 | 0 | ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT); |
598 | 0 | if (offset % abs_data_align) |
599 | 0 | as_bad (_("register save offset not a multiple of %u"), abs_data_align); |
600 | 0 | } |
601 | | |
602 | | /* Add a DW_CFA_def_cfa record to the CFI data. */ |
603 | | |
604 | | void |
605 | | cfi_add_CFA_def_cfa (unsigned regno, offsetT offset) |
606 | 62 | { |
607 | 62 | cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset); |
608 | 62 | frchain_now->frch_cfi_data->cur_cfa_offset = offset; |
609 | 62 | } |
610 | | |
611 | | /* Add a DW_CFA_register record to the CFI data. */ |
612 | | |
613 | | void |
614 | | cfi_add_CFA_register (unsigned reg1, unsigned reg2) |
615 | 0 | { |
616 | 0 | cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2); |
617 | 0 | } |
618 | | |
619 | | /* Add a DW_CFA_def_cfa_register record to the CFI data. */ |
620 | | |
621 | | void |
622 | | cfi_add_CFA_def_cfa_register (unsigned regno) |
623 | 0 | { |
624 | 0 | cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno); |
625 | 0 | } |
626 | | |
627 | | /* Add a DW_CFA_def_cfa_offset record to the CFI data. */ |
628 | | |
629 | | void |
630 | | cfi_add_CFA_def_cfa_offset (offsetT offset) |
631 | 0 | { |
632 | 0 | cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset); |
633 | 0 | frchain_now->frch_cfi_data->cur_cfa_offset = offset; |
634 | 0 | } |
635 | | |
636 | | void |
637 | | cfi_add_CFA_restore (unsigned regno) |
638 | 0 | { |
639 | 0 | cfi_add_CFA_insn_reg (DW_CFA_restore, regno); |
640 | 0 | } |
641 | | |
642 | | void |
643 | | cfi_add_CFA_undefined (unsigned regno) |
644 | 0 | { |
645 | 0 | cfi_add_CFA_insn_reg (DW_CFA_undefined, regno); |
646 | 0 | } |
647 | | |
648 | | void |
649 | | cfi_add_CFA_same_value (unsigned regno) |
650 | 0 | { |
651 | 0 | cfi_add_CFA_insn_reg (DW_CFA_same_value, regno); |
652 | 0 | } |
653 | | |
654 | | void |
655 | | cfi_add_CFA_remember_state (void) |
656 | 0 | { |
657 | 0 | struct cfa_save_data *p; |
658 | |
|
659 | 0 | cfi_add_CFA_insn (DW_CFA_remember_state); |
660 | |
|
661 | 0 | p = XNEW (struct cfa_save_data); |
662 | 0 | p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset; |
663 | 0 | p->next = frchain_now->frch_cfi_data->cfa_save_stack; |
664 | 0 | frchain_now->frch_cfi_data->cfa_save_stack = p; |
665 | 0 | } |
666 | | |
667 | | void |
668 | | cfi_add_CFA_restore_state (void) |
669 | 0 | { |
670 | 0 | struct cfa_save_data *p; |
671 | |
|
672 | 0 | cfi_add_CFA_insn (DW_CFA_restore_state); |
673 | |
|
674 | 0 | p = frchain_now->frch_cfi_data->cfa_save_stack; |
675 | 0 | if (p) |
676 | 0 | { |
677 | 0 | frchain_now->frch_cfi_data->cur_cfa_offset = p->cfa_offset; |
678 | 0 | frchain_now->frch_cfi_data->cfa_save_stack = p->next; |
679 | 0 | free (p); |
680 | 0 | } |
681 | 0 | else |
682 | 0 | as_bad (_("CFI state restore without previous remember")); |
683 | 0 | } |
684 | | |
685 | | |
686 | | /* Parse CFI assembler directives. */ |
687 | | |
688 | | static void dot_cfi (int); |
689 | | static void dot_cfi_escape (int); |
690 | | static void dot_cfi_startproc (int); |
691 | | static void dot_cfi_endproc (int); |
692 | | static void dot_cfi_fde_data (int); |
693 | | static void dot_cfi_personality (int); |
694 | | static void dot_cfi_personality_id (int); |
695 | | static void dot_cfi_lsda (int); |
696 | | static void dot_cfi_val_encoded_addr (int); |
697 | | static void dot_cfi_inline_lsda (int); |
698 | | static void dot_cfi_label (int); |
699 | | |
700 | | const pseudo_typeS cfi_pseudo_table[] = |
701 | | { |
702 | | { "cfi_sections", dot_cfi_sections, 0 }, |
703 | | { "cfi_startproc", dot_cfi_startproc, 0 }, |
704 | | { "cfi_endproc", dot_cfi_endproc, 0 }, |
705 | | { "cfi_fde_data", dot_cfi_fde_data, 0 }, |
706 | | { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa }, |
707 | | { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register }, |
708 | | { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset }, |
709 | | { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, |
710 | | { "cfi_offset", dot_cfi, DW_CFA_offset }, |
711 | | { "cfi_rel_offset", dot_cfi, CFI_rel_offset }, |
712 | | { "cfi_register", dot_cfi, DW_CFA_register }, |
713 | | { "cfi_return_column", dot_cfi, CFI_return_column }, |
714 | | { "cfi_restore", dot_cfi, DW_CFA_restore }, |
715 | | { "cfi_undefined", dot_cfi, DW_CFA_undefined }, |
716 | | { "cfi_same_value", dot_cfi, DW_CFA_same_value }, |
717 | | { "cfi_remember_state", dot_cfi, DW_CFA_remember_state }, |
718 | | { "cfi_restore_state", dot_cfi, DW_CFA_restore_state }, |
719 | | { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save }, |
720 | | { "cfi_negate_ra_state", dot_cfi, DW_CFA_AARCH64_negate_ra_state }, |
721 | | { "cfi_escape", dot_cfi_escape, 0 }, |
722 | | { "cfi_signal_frame", dot_cfi, CFI_signal_frame }, |
723 | | { "cfi_personality", dot_cfi_personality, 0 }, |
724 | | { "cfi_personality_id", dot_cfi_personality_id, 0 }, |
725 | | { "cfi_lsda", dot_cfi_lsda, 0 }, |
726 | | { "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 }, |
727 | | { "cfi_inline_lsda", dot_cfi_inline_lsda, 0 }, |
728 | | { "cfi_label", dot_cfi_label, 0 }, |
729 | | { "cfi_val_offset", dot_cfi, DW_CFA_val_offset }, |
730 | | { NULL, NULL, 0 } |
731 | | }; |
732 | | |
733 | | static void |
734 | | cfi_parse_separator (void) |
735 | 0 | { |
736 | 0 | SKIP_WHITESPACE (); |
737 | 0 | if (*input_line_pointer == ',') |
738 | 0 | input_line_pointer++; |
739 | 0 | else |
740 | 0 | as_bad (_("missing separator")); |
741 | 0 | } |
742 | | |
743 | | #ifndef tc_parse_to_dw2regnum |
744 | | static void |
745 | | tc_parse_to_dw2regnum (expressionS *exp) |
746 | | { |
747 | | # ifdef tc_regname_to_dw2regnum |
748 | | SKIP_WHITESPACE (); |
749 | | if (is_name_beginner (*input_line_pointer) |
750 | | || (*input_line_pointer == '%' |
751 | | && is_name_beginner (*++input_line_pointer))) |
752 | | { |
753 | | char *name, c; |
754 | | |
755 | | c = get_symbol_name (& name); |
756 | | |
757 | | exp->X_op = O_constant; |
758 | | exp->X_add_number = tc_regname_to_dw2regnum (name); |
759 | | |
760 | | restore_line_pointer (c); |
761 | | } |
762 | | else |
763 | | # endif |
764 | | expression_and_evaluate (exp); |
765 | | } |
766 | | #endif |
767 | | |
768 | | static unsigned |
769 | | cfi_parse_reg (void) |
770 | 0 | { |
771 | 0 | int regno; |
772 | 0 | expressionS exp; |
773 | |
|
774 | 0 | tc_parse_to_dw2regnum (&exp); |
775 | 0 | switch (exp.X_op) |
776 | 0 | { |
777 | 0 | case O_register: |
778 | 0 | case O_constant: |
779 | 0 | regno = exp.X_add_number; |
780 | 0 | break; |
781 | | |
782 | 0 | default: |
783 | 0 | regno = -1; |
784 | 0 | break; |
785 | 0 | } |
786 | | |
787 | 0 | if (regno < 0) |
788 | 0 | { |
789 | 0 | as_bad (_("bad register expression")); |
790 | 0 | regno = 0; |
791 | 0 | } |
792 | |
|
793 | 0 | return regno; |
794 | 0 | } |
795 | | |
796 | | static offsetT |
797 | | cfi_parse_const (void) |
798 | 0 | { |
799 | 0 | return get_absolute_expression (); |
800 | 0 | } |
801 | | |
802 | | static void |
803 | | dot_cfi (int arg) |
804 | 0 | { |
805 | 0 | offsetT offset; |
806 | 0 | unsigned reg1, reg2; |
807 | |
|
808 | 0 | if (frchain_now->frch_cfi_data == NULL) |
809 | 0 | { |
810 | 0 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
811 | 0 | ignore_rest_of_line (); |
812 | 0 | return; |
813 | 0 | } |
814 | | |
815 | | /* If the last address was not at the current PC, advance to current. */ |
816 | 0 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
817 | 0 | || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
818 | 0 | != frag_now_fix ())) |
819 | 0 | cfi_add_advance_loc (symbol_temp_new_now ()); |
820 | |
|
821 | 0 | switch (arg) |
822 | 0 | { |
823 | 0 | case DW_CFA_offset: |
824 | 0 | reg1 = cfi_parse_reg (); |
825 | 0 | cfi_parse_separator (); |
826 | 0 | offset = cfi_parse_const (); |
827 | 0 | cfi_add_CFA_offset (reg1, offset); |
828 | 0 | break; |
829 | | |
830 | 0 | case DW_CFA_val_offset: |
831 | 0 | reg1 = cfi_parse_reg (); |
832 | 0 | cfi_parse_separator (); |
833 | 0 | offset = cfi_parse_const (); |
834 | 0 | cfi_add_CFA_val_offset (reg1, offset); |
835 | 0 | break; |
836 | | |
837 | 0 | case CFI_rel_offset: |
838 | 0 | reg1 = cfi_parse_reg (); |
839 | 0 | cfi_parse_separator (); |
840 | 0 | offset = cfi_parse_const (); |
841 | 0 | cfi_add_CFA_offset (reg1, |
842 | 0 | offset - frchain_now->frch_cfi_data->cur_cfa_offset); |
843 | 0 | break; |
844 | | |
845 | 0 | case DW_CFA_def_cfa: |
846 | 0 | reg1 = cfi_parse_reg (); |
847 | 0 | cfi_parse_separator (); |
848 | 0 | offset = cfi_parse_const (); |
849 | 0 | cfi_add_CFA_def_cfa (reg1, offset); |
850 | 0 | break; |
851 | | |
852 | 0 | case DW_CFA_register: |
853 | 0 | reg1 = cfi_parse_reg (); |
854 | 0 | cfi_parse_separator (); |
855 | 0 | reg2 = cfi_parse_reg (); |
856 | 0 | cfi_add_CFA_register (reg1, reg2); |
857 | 0 | break; |
858 | | |
859 | 0 | case DW_CFA_def_cfa_register: |
860 | 0 | reg1 = cfi_parse_reg (); |
861 | 0 | cfi_add_CFA_def_cfa_register (reg1); |
862 | 0 | break; |
863 | | |
864 | 0 | case DW_CFA_def_cfa_offset: |
865 | 0 | offset = cfi_parse_const (); |
866 | 0 | cfi_add_CFA_def_cfa_offset (offset); |
867 | 0 | break; |
868 | | |
869 | 0 | case CFI_adjust_cfa_offset: |
870 | 0 | offset = cfi_parse_const (); |
871 | 0 | cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset |
872 | 0 | + offset); |
873 | 0 | break; |
874 | | |
875 | 0 | case DW_CFA_restore: |
876 | 0 | for (;;) |
877 | 0 | { |
878 | 0 | reg1 = cfi_parse_reg (); |
879 | 0 | cfi_add_CFA_restore (reg1); |
880 | 0 | SKIP_WHITESPACE (); |
881 | 0 | if (*input_line_pointer != ',') |
882 | 0 | break; |
883 | 0 | ++input_line_pointer; |
884 | 0 | } |
885 | 0 | break; |
886 | | |
887 | 0 | case DW_CFA_undefined: |
888 | 0 | for (;;) |
889 | 0 | { |
890 | 0 | reg1 = cfi_parse_reg (); |
891 | 0 | cfi_add_CFA_undefined (reg1); |
892 | 0 | SKIP_WHITESPACE (); |
893 | 0 | if (*input_line_pointer != ',') |
894 | 0 | break; |
895 | 0 | ++input_line_pointer; |
896 | 0 | } |
897 | 0 | break; |
898 | | |
899 | 0 | case DW_CFA_same_value: |
900 | 0 | reg1 = cfi_parse_reg (); |
901 | 0 | cfi_add_CFA_same_value (reg1); |
902 | 0 | break; |
903 | | |
904 | 0 | case CFI_return_column: |
905 | 0 | reg1 = cfi_parse_reg (); |
906 | 0 | cfi_set_return_column (reg1); |
907 | 0 | break; |
908 | | |
909 | 0 | case DW_CFA_remember_state: |
910 | 0 | cfi_add_CFA_remember_state (); |
911 | 0 | break; |
912 | | |
913 | 0 | case DW_CFA_restore_state: |
914 | 0 | cfi_add_CFA_restore_state (); |
915 | 0 | break; |
916 | | |
917 | 0 | case DW_CFA_GNU_window_save: |
918 | 0 | cfi_add_CFA_insn (DW_CFA_GNU_window_save); |
919 | 0 | break; |
920 | | |
921 | 0 | case CFI_signal_frame: |
922 | 0 | frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1; |
923 | 0 | break; |
924 | | |
925 | 0 | default: |
926 | 0 | abort (); |
927 | 0 | } |
928 | | |
929 | 0 | demand_empty_rest_of_line (); |
930 | 0 | } |
931 | | |
932 | | static void |
933 | | dot_cfi_escape (int ignored ATTRIBUTE_UNUSED) |
934 | 0 | { |
935 | 0 | struct cfi_escape_data *head, **tail, *e; |
936 | 0 | struct cfi_insn_data *insn; |
937 | |
|
938 | 0 | if (frchain_now->frch_cfi_data == NULL) |
939 | 0 | { |
940 | 0 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
941 | 0 | ignore_rest_of_line (); |
942 | 0 | return; |
943 | 0 | } |
944 | | |
945 | | /* If the last address was not at the current PC, advance to current. */ |
946 | 0 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
947 | 0 | || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
948 | 0 | != frag_now_fix ())) |
949 | 0 | cfi_add_advance_loc (symbol_temp_new_now ()); |
950 | |
|
951 | 0 | tail = &head; |
952 | 0 | do |
953 | 0 | { |
954 | 0 | e = XNEW (struct cfi_escape_data); |
955 | 0 | do_parse_cons_expression (&e->exp, 1); |
956 | 0 | *tail = e; |
957 | 0 | tail = &e->next; |
958 | 0 | } |
959 | 0 | while (*input_line_pointer++ == ','); |
960 | 0 | *tail = NULL; |
961 | |
|
962 | 0 | insn = alloc_cfi_insn_data (); |
963 | 0 | insn->insn = CFI_escape; |
964 | 0 | insn->u.esc = head; |
965 | |
|
966 | 0 | --input_line_pointer; |
967 | 0 | demand_empty_rest_of_line (); |
968 | 0 | } |
969 | | |
970 | | static void |
971 | | dot_cfi_personality (int ignored ATTRIBUTE_UNUSED) |
972 | 0 | { |
973 | 0 | struct fde_entry *fde; |
974 | 0 | offsetT encoding; |
975 | |
|
976 | 0 | if (frchain_now->frch_cfi_data == NULL) |
977 | 0 | { |
978 | 0 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
979 | 0 | ignore_rest_of_line (); |
980 | 0 | return; |
981 | 0 | } |
982 | | |
983 | 0 | fde = frchain_now->frch_cfi_data->cur_fde_data; |
984 | 0 | encoding = cfi_parse_const (); |
985 | 0 | if (encoding == DW_EH_PE_omit) |
986 | 0 | { |
987 | 0 | demand_empty_rest_of_line (); |
988 | 0 | fde->per_encoding = encoding; |
989 | 0 | return; |
990 | 0 | } |
991 | | |
992 | 0 | if ((encoding & 0xff) != encoding |
993 | 0 | || ((((encoding & 0x70) != 0 |
994 | 0 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
995 | 0 | && (encoding & 0x70) != DW_EH_PE_pcrel |
996 | 0 | #endif |
997 | 0 | ) |
998 | | /* leb128 can be handled, but does something actually need it? */ |
999 | 0 | || (encoding & 7) == DW_EH_PE_uleb128 |
1000 | 0 | || (encoding & 7) > DW_EH_PE_udata8) |
1001 | 0 | && tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE)) |
1002 | 0 | { |
1003 | 0 | as_bad (_("invalid or unsupported encoding in .cfi_personality")); |
1004 | 0 | ignore_rest_of_line (); |
1005 | 0 | return; |
1006 | 0 | } |
1007 | | |
1008 | 0 | if (*input_line_pointer++ != ',') |
1009 | 0 | { |
1010 | 0 | as_bad (_(".cfi_personality requires encoding and symbol arguments")); |
1011 | 0 | ignore_rest_of_line (); |
1012 | 0 | return; |
1013 | 0 | } |
1014 | | |
1015 | 0 | expression_and_evaluate (&fde->personality); |
1016 | 0 | switch (fde->personality.X_op) |
1017 | 0 | { |
1018 | 0 | case O_symbol: |
1019 | 0 | break; |
1020 | 0 | case O_constant: |
1021 | 0 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
1022 | 0 | encoding = DW_EH_PE_omit; |
1023 | 0 | break; |
1024 | 0 | default: |
1025 | 0 | encoding = DW_EH_PE_omit; |
1026 | 0 | break; |
1027 | 0 | } |
1028 | | |
1029 | 0 | fde->per_encoding = encoding; |
1030 | |
|
1031 | 0 | if (encoding == DW_EH_PE_omit) |
1032 | 0 | { |
1033 | 0 | as_bad (_("wrong second argument to .cfi_personality")); |
1034 | 0 | ignore_rest_of_line (); |
1035 | 0 | return; |
1036 | 0 | } |
1037 | | |
1038 | 0 | demand_empty_rest_of_line (); |
1039 | 0 | } |
1040 | | |
1041 | | static void |
1042 | | dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED) |
1043 | 0 | { |
1044 | 0 | struct fde_entry *fde; |
1045 | 0 | offsetT encoding; |
1046 | |
|
1047 | 0 | if (frchain_now->frch_cfi_data == NULL) |
1048 | 0 | { |
1049 | 0 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
1050 | 0 | ignore_rest_of_line (); |
1051 | 0 | return; |
1052 | 0 | } |
1053 | | |
1054 | 0 | fde = frchain_now->frch_cfi_data->cur_fde_data; |
1055 | 0 | encoding = cfi_parse_const (); |
1056 | 0 | if (encoding == DW_EH_PE_omit) |
1057 | 0 | { |
1058 | 0 | demand_empty_rest_of_line (); |
1059 | 0 | fde->lsda_encoding = encoding; |
1060 | 0 | return; |
1061 | 0 | } |
1062 | | |
1063 | 0 | if ((encoding & 0xff) != encoding |
1064 | 0 | || ((((encoding & 0x70) != 0 |
1065 | 0 | #if CFI_DIFF_LSDA_OK || defined tc_cfi_emit_pcrel_expr |
1066 | 0 | && (encoding & 0x70) != DW_EH_PE_pcrel |
1067 | 0 | #endif |
1068 | 0 | ) |
1069 | | /* leb128 can be handled, but does something actually need it? */ |
1070 | 0 | || (encoding & 7) == DW_EH_PE_uleb128 |
1071 | 0 | || (encoding & 7) > DW_EH_PE_udata8) |
1072 | 0 | && tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE)) |
1073 | 0 | { |
1074 | 0 | as_bad (_("invalid or unsupported encoding in .cfi_lsda")); |
1075 | 0 | ignore_rest_of_line (); |
1076 | 0 | return; |
1077 | 0 | } |
1078 | | |
1079 | 0 | if (*input_line_pointer++ != ',') |
1080 | 0 | { |
1081 | 0 | as_bad (_(".cfi_lsda requires encoding and symbol arguments")); |
1082 | 0 | ignore_rest_of_line (); |
1083 | 0 | return; |
1084 | 0 | } |
1085 | | |
1086 | 0 | fde->lsda_encoding = encoding; |
1087 | |
|
1088 | 0 | expression_and_evaluate (&fde->lsda); |
1089 | 0 | switch (fde->lsda.X_op) |
1090 | 0 | { |
1091 | 0 | case O_symbol: |
1092 | 0 | break; |
1093 | 0 | case O_constant: |
1094 | 0 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
1095 | 0 | encoding = DW_EH_PE_omit; |
1096 | 0 | break; |
1097 | 0 | default: |
1098 | 0 | encoding = DW_EH_PE_omit; |
1099 | 0 | break; |
1100 | 0 | } |
1101 | | |
1102 | 0 | fde->lsda_encoding = encoding; |
1103 | |
|
1104 | 0 | if (encoding == DW_EH_PE_omit) |
1105 | 0 | { |
1106 | 0 | as_bad (_("wrong second argument to .cfi_lsda")); |
1107 | 0 | ignore_rest_of_line (); |
1108 | 0 | return; |
1109 | 0 | } |
1110 | | |
1111 | 0 | demand_empty_rest_of_line (); |
1112 | 0 | } |
1113 | | |
1114 | | static void |
1115 | | dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED) |
1116 | 0 | { |
1117 | 0 | struct cfi_insn_data *insn_ptr; |
1118 | 0 | offsetT encoding; |
1119 | |
|
1120 | 0 | if (frchain_now->frch_cfi_data == NULL) |
1121 | 0 | { |
1122 | 0 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
1123 | 0 | ignore_rest_of_line (); |
1124 | 0 | return; |
1125 | 0 | } |
1126 | | |
1127 | | /* If the last address was not at the current PC, advance to current. */ |
1128 | 0 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
1129 | 0 | || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
1130 | 0 | != frag_now_fix ())) |
1131 | 0 | cfi_add_advance_loc (symbol_temp_new_now ()); |
1132 | |
|
1133 | 0 | insn_ptr = alloc_cfi_insn_data (); |
1134 | 0 | insn_ptr->insn = CFI_val_encoded_addr; |
1135 | |
|
1136 | 0 | insn_ptr->u.ea.reg = cfi_parse_reg (); |
1137 | |
|
1138 | 0 | cfi_parse_separator (); |
1139 | 0 | encoding = cfi_parse_const (); |
1140 | 0 | if ((encoding & 0xff) != encoding |
1141 | 0 | || ((encoding & 0x70) != 0 |
1142 | 0 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
1143 | 0 | && (encoding & 0x70) != DW_EH_PE_pcrel |
1144 | 0 | #endif |
1145 | 0 | ) |
1146 | | /* leb128 can be handled, but does something actually need it? */ |
1147 | 0 | || (encoding & 7) == DW_EH_PE_uleb128 |
1148 | 0 | || (encoding & 7) > DW_EH_PE_udata8) |
1149 | 0 | { |
1150 | 0 | as_bad (_("invalid or unsupported encoding in .cfi_lsda")); |
1151 | 0 | encoding = DW_EH_PE_omit; |
1152 | 0 | } |
1153 | |
|
1154 | 0 | cfi_parse_separator (); |
1155 | 0 | expression_and_evaluate (&insn_ptr->u.ea.exp); |
1156 | 0 | switch (insn_ptr->u.ea.exp.X_op) |
1157 | 0 | { |
1158 | 0 | case O_symbol: |
1159 | 0 | break; |
1160 | 0 | case O_constant: |
1161 | 0 | if ((encoding & 0x70) != DW_EH_PE_pcrel) |
1162 | 0 | break; |
1163 | | /* Fall through. */ |
1164 | 0 | default: |
1165 | 0 | encoding = DW_EH_PE_omit; |
1166 | 0 | break; |
1167 | 0 | } |
1168 | | |
1169 | 0 | insn_ptr->u.ea.encoding = encoding; |
1170 | 0 | if (encoding == DW_EH_PE_omit) |
1171 | 0 | { |
1172 | 0 | as_bad (_("wrong third argument to .cfi_val_encoded_addr")); |
1173 | 0 | ignore_rest_of_line (); |
1174 | 0 | return; |
1175 | 0 | } |
1176 | | |
1177 | 0 | demand_empty_rest_of_line (); |
1178 | 0 | } |
1179 | | |
1180 | | static void |
1181 | | dot_cfi_label (int ignored ATTRIBUTE_UNUSED) |
1182 | 0 | { |
1183 | 0 | char *name; |
1184 | |
|
1185 | 0 | if (frchain_now->frch_cfi_data == NULL) |
1186 | 0 | { |
1187 | 0 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
1188 | 0 | ignore_rest_of_line (); |
1189 | 0 | return; |
1190 | 0 | } |
1191 | | |
1192 | 0 | name = read_symbol_name (); |
1193 | 0 | if (name == NULL) |
1194 | 0 | return; |
1195 | | |
1196 | | /* If the last address was not at the current PC, advance to current. */ |
1197 | 0 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
1198 | 0 | || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
1199 | 0 | != frag_now_fix ())) |
1200 | 0 | cfi_add_advance_loc (symbol_temp_new_now ()); |
1201 | |
|
1202 | 0 | cfi_add_label (name); |
1203 | 0 | free (name); |
1204 | |
|
1205 | 0 | demand_empty_rest_of_line (); |
1206 | 0 | } |
1207 | | |
1208 | | void |
1209 | | dot_cfi_sections (int ignored ATTRIBUTE_UNUSED) |
1210 | 22 | { |
1211 | 22 | int sections = 0; |
1212 | | |
1213 | 22 | SKIP_WHITESPACE (); |
1214 | 22 | if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"') |
1215 | 21 | while (1) |
1216 | 21 | { |
1217 | 21 | char * saved_ilp; |
1218 | 21 | char *name, c; |
1219 | | |
1220 | 21 | saved_ilp = input_line_pointer; |
1221 | 21 | c = get_symbol_name (& name); |
1222 | | |
1223 | 21 | if (startswith (name, ".eh_frame") |
1224 | 21 | && name[9] != '_') |
1225 | 0 | sections |= CFI_EMIT_eh_frame; |
1226 | 21 | else if (startswith (name, ".debug_frame")) |
1227 | 0 | sections |= CFI_EMIT_debug_frame; |
1228 | | #if SUPPORT_COMPACT_EH |
1229 | | else if (startswith (name, ".eh_frame_entry")) |
1230 | | { |
1231 | | compact_eh = true; |
1232 | | sections |= CFI_EMIT_eh_frame_compact; |
1233 | | } |
1234 | | #endif |
1235 | | #ifdef tc_cfi_section_name |
1236 | | else if (strcmp (name, tc_cfi_section_name) == 0) |
1237 | | sections |= CFI_EMIT_target; |
1238 | | #endif |
1239 | 21 | else if (startswith (name, ".sframe")) |
1240 | 0 | sections |= CFI_EMIT_sframe; |
1241 | 21 | else |
1242 | 21 | { |
1243 | 21 | *input_line_pointer = c; |
1244 | 21 | input_line_pointer = saved_ilp; |
1245 | 21 | break; |
1246 | 21 | } |
1247 | | |
1248 | 0 | *input_line_pointer = c; |
1249 | 0 | SKIP_WHITESPACE_AFTER_NAME (); |
1250 | 0 | if (*input_line_pointer == ',') |
1251 | 0 | { |
1252 | 0 | name = input_line_pointer++; |
1253 | 0 | SKIP_WHITESPACE (); |
1254 | 0 | if (!is_name_beginner (*input_line_pointer) |
1255 | 0 | && *input_line_pointer != '"') |
1256 | 0 | { |
1257 | 0 | input_line_pointer = name; |
1258 | 0 | break; |
1259 | 0 | } |
1260 | 0 | } |
1261 | 0 | else if (is_name_beginner (*input_line_pointer) |
1262 | 0 | || *input_line_pointer == '"') |
1263 | 0 | break; |
1264 | 0 | } |
1265 | | |
1266 | 22 | demand_empty_rest_of_line (); |
1267 | 22 | if (cfi_sections_set |
1268 | 22 | && (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact)) |
1269 | 22 | && ((cfi_sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact)) |
1270 | 0 | != (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact)))) |
1271 | 0 | as_bad (_("inconsistent uses of .cfi_sections")); |
1272 | 22 | cfi_sections = sections; |
1273 | 22 | } |
1274 | | |
1275 | | static void |
1276 | | dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED) |
1277 | 197 | { |
1278 | 197 | int simple = 0; |
1279 | | |
1280 | 197 | if (frchain_now->frch_cfi_data != NULL) |
1281 | 135 | { |
1282 | 135 | as_bad (_("previous CFI entry not closed (missing .cfi_endproc)")); |
1283 | 135 | ignore_rest_of_line (); |
1284 | 135 | return; |
1285 | 135 | } |
1286 | | |
1287 | 62 | cfi_new_fde (symbol_temp_new_now ()); |
1288 | | |
1289 | 62 | SKIP_WHITESPACE (); |
1290 | 62 | if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"') |
1291 | 61 | { |
1292 | 61 | char * saved_ilp = input_line_pointer; |
1293 | 61 | char *name, c; |
1294 | | |
1295 | 61 | c = get_symbol_name (& name); |
1296 | | |
1297 | 61 | if (strcmp (name, "simple") == 0) |
1298 | 0 | { |
1299 | 0 | simple = 1; |
1300 | 0 | restore_line_pointer (c); |
1301 | 0 | } |
1302 | 61 | else |
1303 | 61 | input_line_pointer = saved_ilp; |
1304 | 61 | } |
1305 | 62 | demand_empty_rest_of_line (); |
1306 | | |
1307 | 62 | cfi_set_sections (); |
1308 | | |
1309 | 62 | frchain_now->frch_cfi_data->cur_cfa_offset = 0; |
1310 | 62 | if (!simple) |
1311 | 62 | tc_cfi_frame_initial_instructions (); |
1312 | | |
1313 | 62 | if ((all_cfi_sections & CFI_EMIT_target) != 0) |
1314 | 0 | tc_cfi_startproc (); |
1315 | 62 | } |
1316 | | |
1317 | | static void |
1318 | | dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED) |
1319 | 0 | { |
1320 | 0 | if (frchain_now->frch_cfi_data == NULL) |
1321 | 0 | { |
1322 | 0 | as_bad (_(".cfi_endproc without corresponding .cfi_startproc")); |
1323 | 0 | ignore_rest_of_line (); |
1324 | 0 | return; |
1325 | 0 | } |
1326 | | |
1327 | 0 | cfi_set_last_fde (frchain_now->frch_cfi_data->cur_fde_data); |
1328 | |
|
1329 | 0 | cfi_end_fde (symbol_temp_new_now ()); |
1330 | |
|
1331 | 0 | demand_empty_rest_of_line (); |
1332 | |
|
1333 | 0 | if ((all_cfi_sections & CFI_EMIT_target) != 0) |
1334 | 0 | tc_cfi_endproc (last_fde); |
1335 | 0 | } |
1336 | | |
1337 | | static segT |
1338 | | get_cfi_seg (segT cseg, const char *base, flagword flags, int align) |
1339 | 722 | { |
1340 | | /* Exclude .debug_frame sections for Compact EH. */ |
1341 | 722 | if (SUPPORT_FRAME_LINKONCE || ((flags & SEC_DEBUGGING) == 0 && compact_eh) |
1342 | 722 | || ((flags & SEC_DEBUGGING) == 0 && TARGET_MULTIPLE_EH_FRAME_SECTIONS)) |
1343 | 0 | { |
1344 | 0 | segT iseg = cseg; |
1345 | 0 | struct dwcfi_seg_list *l; |
1346 | |
|
1347 | 0 | l = dwcfi_hash_find_or_make (cseg, base, flags); |
1348 | |
|
1349 | 0 | cseg = l->seg; |
1350 | 0 | subseg_set (cseg, l->subseg); |
1351 | |
|
1352 | 0 | if (TARGET_MULTIPLE_EH_FRAME_SECTIONS |
1353 | 0 | && (flags & DWARF2_EH_FRAME_READ_ONLY)) |
1354 | 0 | { |
1355 | 0 | const frchainS *ifrch = seg_info (iseg)->frchainP; |
1356 | 0 | const frchainS *frch = seg_info (cseg)->frchainP; |
1357 | 0 | expressionS exp; |
1358 | |
|
1359 | 0 | exp.X_op = O_symbol; |
1360 | 0 | exp.X_add_symbol = (symbolS *) local_symbol_make (cseg->name, cseg, frch->frch_root, 0); |
1361 | 0 | exp.X_add_number = 0; |
1362 | 0 | subseg_set (iseg, ifrch->frch_subseg); |
1363 | 0 | fix_new_exp (ifrch->frch_root, 0, 0, &exp, 0, BFD_RELOC_NONE); |
1364 | | |
1365 | | /* Restore the original segment info. */ |
1366 | 0 | subseg_set (cseg, l->subseg); |
1367 | 0 | } |
1368 | 0 | } |
1369 | 722 | else |
1370 | 722 | { |
1371 | 722 | cseg = subseg_new (base, 0); |
1372 | 722 | bfd_set_section_flags (cseg, flags); |
1373 | 722 | } |
1374 | 722 | record_alignment (cseg, align); |
1375 | 722 | return cseg; |
1376 | 722 | } |
1377 | | |
1378 | | #if SUPPORT_COMPACT_EH |
1379 | | static void |
1380 | | dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED) |
1381 | | { |
1382 | | struct fde_entry *fde; |
1383 | | |
1384 | | if (frchain_now->frch_cfi_data == NULL) |
1385 | | { |
1386 | | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
1387 | | ignore_rest_of_line (); |
1388 | | return; |
1389 | | } |
1390 | | |
1391 | | fde = frchain_now->frch_cfi_data->cur_fde_data; |
1392 | | fde->personality_id = cfi_parse_const (); |
1393 | | demand_empty_rest_of_line (); |
1394 | | |
1395 | | if (fde->personality_id == 0 || fde->personality_id > 3) |
1396 | | { |
1397 | | as_bad (_("wrong argument to .cfi_personality_id")); |
1398 | | return; |
1399 | | } |
1400 | | } |
1401 | | |
1402 | | static void |
1403 | | dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED) |
1404 | | { |
1405 | | if (frchain_now->frch_cfi_data == NULL) |
1406 | | { |
1407 | | as_bad (_(".cfi_fde_data without corresponding .cfi_startproc")); |
1408 | | ignore_rest_of_line (); |
1409 | | return; |
1410 | | } |
1411 | | |
1412 | | cfi_set_last_fde (frchain_now->frch_cfi_data->cur_fde_data); |
1413 | | |
1414 | | if ((all_cfi_sections & CFI_EMIT_target) != 0 |
1415 | | || (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 0) |
1416 | | { |
1417 | | struct cfi_escape_data *head, **tail, *e; |
1418 | | int num_ops = 0; |
1419 | | |
1420 | | tail = &head; |
1421 | | if (!is_it_end_of_statement ()) |
1422 | | { |
1423 | | num_ops = 0; |
1424 | | do |
1425 | | { |
1426 | | e = XNEW (struct cfi_escape_data); |
1427 | | do_parse_cons_expression (&e->exp, 1); |
1428 | | *tail = e; |
1429 | | tail = &e->next; |
1430 | | num_ops++; |
1431 | | } |
1432 | | while (*input_line_pointer++ == ','); |
1433 | | --input_line_pointer; |
1434 | | } |
1435 | | *tail = NULL; |
1436 | | |
1437 | | if (last_fde->lsda_encoding != DW_EH_PE_omit) |
1438 | | last_fde->eh_header_type = EH_COMPACT_HAS_LSDA; |
1439 | | else if (num_ops <= 3 && last_fde->per_encoding == DW_EH_PE_omit) |
1440 | | last_fde->eh_header_type = EH_COMPACT_INLINE; |
1441 | | else |
1442 | | last_fde->eh_header_type = EH_COMPACT_OUTLINE; |
1443 | | |
1444 | | if (last_fde->eh_header_type == EH_COMPACT_INLINE) |
1445 | | num_ops = 3; |
1446 | | |
1447 | | last_fde->eh_data_size = num_ops; |
1448 | | last_fde->eh_data = XNEWVEC (bfd_byte, num_ops); |
1449 | | num_ops = 0; |
1450 | | while (head) |
1451 | | { |
1452 | | e = head; |
1453 | | head = e->next; |
1454 | | last_fde->eh_data[num_ops++] = e->exp.X_add_number; |
1455 | | free (e); |
1456 | | } |
1457 | | if (last_fde->eh_header_type == EH_COMPACT_INLINE) |
1458 | | while (num_ops < 3) |
1459 | | last_fde->eh_data[num_ops++] = tc_compact_eh_opcode_stop; |
1460 | | } |
1461 | | |
1462 | | demand_empty_rest_of_line (); |
1463 | | } |
1464 | | |
1465 | | /* Function to emit the compact unwinding opcodes stored in the |
1466 | | fde's eh_data field. The end of the opcode data will be |
1467 | | padded to the value in align. */ |
1468 | | |
1469 | | static void |
1470 | | output_compact_unwind_data (struct fde_entry *fde, int align) |
1471 | | { |
1472 | | int data_size = fde->eh_data_size + 2; |
1473 | | int align_padding; |
1474 | | int amask; |
1475 | | char *p; |
1476 | | |
1477 | | fde->eh_loc = symbol_temp_new_now (); |
1478 | | |
1479 | | p = frag_more (1); |
1480 | | if (fde->personality_id != 0) |
1481 | | *p = fde->personality_id; |
1482 | | else if (fde->per_encoding != DW_EH_PE_omit) |
1483 | | { |
1484 | | *p = 0; |
1485 | | emit_expr_encoded (&fde->personality, fde->per_encoding, false); |
1486 | | data_size += encoding_size (fde->per_encoding); |
1487 | | } |
1488 | | else |
1489 | | *p = 1; |
1490 | | |
1491 | | amask = (1 << align) - 1; |
1492 | | align_padding = ((data_size + amask) & ~amask) - data_size; |
1493 | | |
1494 | | p = frag_more (fde->eh_data_size + 1 + align_padding); |
1495 | | memcpy (p, fde->eh_data, fde->eh_data_size); |
1496 | | p += fde->eh_data_size; |
1497 | | |
1498 | | while (align_padding-- > 0) |
1499 | | *(p++) = tc_compact_eh_opcode_pad; |
1500 | | |
1501 | | *(p++) = tc_compact_eh_opcode_stop; |
1502 | | fde->eh_header_type = EH_COMPACT_OUTLINE_DONE; |
1503 | | } |
1504 | | |
1505 | | /* Handle the .cfi_inline_lsda directive. */ |
1506 | | static void |
1507 | | dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED) |
1508 | | { |
1509 | | segT ccseg; |
1510 | | int align; |
1511 | | long max_alignment = 28; |
1512 | | |
1513 | | if (!last_fde) |
1514 | | { |
1515 | | as_bad (_("unexpected .cfi_inline_lsda")); |
1516 | | ignore_rest_of_line (); |
1517 | | return; |
1518 | | } |
1519 | | |
1520 | | if ((last_fde->sections & CFI_EMIT_eh_frame_compact) == 0) |
1521 | | { |
1522 | | as_bad (_(".cfi_inline_lsda not valid for this frame")); |
1523 | | ignore_rest_of_line (); |
1524 | | return; |
1525 | | } |
1526 | | |
1527 | | if (last_fde->eh_header_type != EH_COMPACT_UNKNOWN |
1528 | | && last_fde->eh_header_type != EH_COMPACT_HAS_LSDA) |
1529 | | { |
1530 | | as_bad (_(".cfi_inline_lsda seen for frame without .cfi_lsda")); |
1531 | | ignore_rest_of_line (); |
1532 | | return; |
1533 | | } |
1534 | | |
1535 | | #ifdef md_flush_pending_output |
1536 | | md_flush_pending_output (); |
1537 | | #endif |
1538 | | |
1539 | | align = get_absolute_expression (); |
1540 | | if (align > max_alignment) |
1541 | | { |
1542 | | align = max_alignment; |
1543 | | as_bad (_("Alignment too large: %d. assumed."), align); |
1544 | | } |
1545 | | else if (align < 0) |
1546 | | { |
1547 | | as_warn (_("Alignment negative: 0 assumed.")); |
1548 | | align = 0; |
1549 | | } |
1550 | | |
1551 | | demand_empty_rest_of_line (); |
1552 | | ccseg = CUR_SEG (last_fde); |
1553 | | |
1554 | | /* Open .gnu_extab section. */ |
1555 | | get_cfi_seg (ccseg, ".gnu_extab", |
1556 | | (SEC_ALLOC | SEC_LOAD | SEC_DATA |
1557 | | | DWARF2_EH_FRAME_READ_ONLY), |
1558 | | 1); |
1559 | | |
1560 | | frag_align (align, 0, 0); |
1561 | | record_alignment (now_seg, align); |
1562 | | if (last_fde->eh_header_type == EH_COMPACT_HAS_LSDA) |
1563 | | output_compact_unwind_data (last_fde, align); |
1564 | | |
1565 | | cfi_set_last_fde (NULL); |
1566 | | |
1567 | | return; |
1568 | | } |
1569 | | #else /* !SUPPORT_COMPACT_EH */ |
1570 | | static void |
1571 | | dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED) |
1572 | 0 | { |
1573 | 0 | as_bad (_(".cfi_inline_lsda is not supported for this target")); |
1574 | 0 | ignore_rest_of_line (); |
1575 | 0 | } |
1576 | | |
1577 | | static void |
1578 | | dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED) |
1579 | 0 | { |
1580 | 0 | as_bad (_(".cfi_fde_data is not supported for this target")); |
1581 | 0 | ignore_rest_of_line (); |
1582 | 0 | } |
1583 | | |
1584 | | static void |
1585 | | dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED) |
1586 | 0 | { |
1587 | 0 | as_bad (_(".cfi_personality_id is not supported for this target")); |
1588 | 0 | ignore_rest_of_line (); |
1589 | 0 | } |
1590 | | #endif |
1591 | | |
1592 | | static void |
1593 | | output_cfi_insn (struct cfi_insn_data *insn) |
1594 | 1.44k | { |
1595 | 1.44k | offsetT offset; |
1596 | 1.44k | unsigned int regno; |
1597 | | |
1598 | 1.44k | switch (insn->insn) |
1599 | 1.44k | { |
1600 | 0 | case DW_CFA_advance_loc: |
1601 | 0 | { |
1602 | 0 | symbolS *from = insn->u.ll.lab1; |
1603 | 0 | symbolS *to = insn->u.ll.lab2; |
1604 | |
|
1605 | 0 | if (symbol_get_frag (to) == symbol_get_frag (from)) |
1606 | 0 | { |
1607 | 0 | addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from); |
1608 | 0 | addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH; |
1609 | |
|
1610 | 0 | if (scaled == 0) |
1611 | 0 | ; |
1612 | 0 | else if (scaled <= 0x3F) |
1613 | 0 | out_one (DW_CFA_advance_loc + scaled); |
1614 | 0 | else if (scaled <= 0xFF) |
1615 | 0 | { |
1616 | 0 | out_one (DW_CFA_advance_loc1); |
1617 | 0 | out_one (scaled); |
1618 | 0 | } |
1619 | 0 | else if (scaled <= 0xFFFF) |
1620 | 0 | { |
1621 | 0 | out_one (DW_CFA_advance_loc2); |
1622 | 0 | out_two (scaled); |
1623 | 0 | } |
1624 | 0 | else |
1625 | 0 | { |
1626 | 0 | out_one (DW_CFA_advance_loc4); |
1627 | 0 | out_four (scaled); |
1628 | 0 | } |
1629 | 0 | } |
1630 | 0 | else |
1631 | 0 | { |
1632 | 0 | expressionS exp; |
1633 | |
|
1634 | 0 | exp.X_op = O_subtract; |
1635 | 0 | exp.X_add_symbol = to; |
1636 | 0 | exp.X_op_symbol = from; |
1637 | 0 | exp.X_add_number = 0; |
1638 | | |
1639 | | /* The code in ehopt.c expects that one byte of the encoding |
1640 | | is already allocated to the frag. This comes from the way |
1641 | | that it scans the .eh_frame section looking first for the |
1642 | | .byte DW_CFA_advance_loc4. Call frag_grow with the sum of |
1643 | | room needed by frag_more and frag_var to preallocate space |
1644 | | ensuring that the DW_CFA_advance_loc4 is in the fixed part |
1645 | | of the rs_cfa frag, so that the relax machinery can remove |
1646 | | the advance_loc should it advance by zero. */ |
1647 | 0 | frag_grow (5); |
1648 | 0 | *frag_more (1) = DW_CFA_advance_loc4; |
1649 | |
|
1650 | 0 | frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3, |
1651 | 0 | make_expr_symbol (&exp), frag_now_fix () - 1, |
1652 | 0 | (char *) frag_now); |
1653 | 0 | } |
1654 | 0 | } |
1655 | 0 | break; |
1656 | | |
1657 | 722 | case DW_CFA_def_cfa: |
1658 | 722 | offset = insn->u.ri.offset; |
1659 | 722 | if (offset < 0) |
1660 | 0 | { |
1661 | 0 | out_one (DW_CFA_def_cfa_sf); |
1662 | 0 | out_uleb128 (insn->u.ri.reg); |
1663 | 0 | out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
1664 | 0 | } |
1665 | 722 | else |
1666 | 722 | { |
1667 | 722 | out_one (DW_CFA_def_cfa); |
1668 | 722 | out_uleb128 (insn->u.ri.reg); |
1669 | 722 | out_uleb128 (offset); |
1670 | 722 | } |
1671 | 722 | break; |
1672 | | |
1673 | 0 | case DW_CFA_def_cfa_register: |
1674 | 0 | case DW_CFA_undefined: |
1675 | 0 | case DW_CFA_same_value: |
1676 | 0 | out_one (insn->insn); |
1677 | 0 | out_uleb128 (insn->u.r); |
1678 | 0 | break; |
1679 | | |
1680 | 0 | case DW_CFA_def_cfa_offset: |
1681 | 0 | offset = insn->u.i; |
1682 | 0 | if (offset < 0) |
1683 | 0 | { |
1684 | 0 | out_one (DW_CFA_def_cfa_offset_sf); |
1685 | 0 | out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
1686 | 0 | } |
1687 | 0 | else |
1688 | 0 | { |
1689 | 0 | out_one (DW_CFA_def_cfa_offset); |
1690 | 0 | out_uleb128 (offset); |
1691 | 0 | } |
1692 | 0 | break; |
1693 | | |
1694 | 0 | case DW_CFA_restore: |
1695 | 0 | regno = insn->u.r; |
1696 | 0 | if (regno <= 0x3F) |
1697 | 0 | { |
1698 | 0 | out_one (DW_CFA_restore + regno); |
1699 | 0 | } |
1700 | 0 | else |
1701 | 0 | { |
1702 | 0 | out_one (DW_CFA_restore_extended); |
1703 | 0 | out_uleb128 (regno); |
1704 | 0 | } |
1705 | 0 | break; |
1706 | | |
1707 | 722 | case DW_CFA_offset: |
1708 | 722 | regno = insn->u.ri.reg; |
1709 | 722 | offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; |
1710 | 722 | if (offset < 0) |
1711 | 0 | { |
1712 | 0 | out_one (DW_CFA_offset_extended_sf); |
1713 | 0 | out_uleb128 (regno); |
1714 | 0 | out_sleb128 (offset); |
1715 | 0 | } |
1716 | 722 | else if (regno <= 0x3F) |
1717 | 722 | { |
1718 | 722 | out_one (DW_CFA_offset + regno); |
1719 | 722 | out_uleb128 (offset); |
1720 | 722 | } |
1721 | 0 | else |
1722 | 0 | { |
1723 | 0 | out_one (DW_CFA_offset_extended); |
1724 | 0 | out_uleb128 (regno); |
1725 | 0 | out_uleb128 (offset); |
1726 | 0 | } |
1727 | 722 | break; |
1728 | | |
1729 | 0 | case DW_CFA_val_offset: |
1730 | 0 | regno = insn->u.ri.reg; |
1731 | 0 | offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; |
1732 | 0 | if (offset < 0) |
1733 | 0 | { |
1734 | 0 | out_one (DW_CFA_val_offset_sf); |
1735 | 0 | out_uleb128 (regno); |
1736 | 0 | out_sleb128 (offset); |
1737 | 0 | } |
1738 | 0 | else |
1739 | 0 | { |
1740 | 0 | out_one (DW_CFA_val_offset); |
1741 | 0 | out_uleb128 (regno); |
1742 | 0 | out_uleb128 (offset); |
1743 | 0 | } |
1744 | 0 | break; |
1745 | | |
1746 | 0 | case DW_CFA_register: |
1747 | 0 | out_one (DW_CFA_register); |
1748 | 0 | out_uleb128 (insn->u.rr.reg1); |
1749 | 0 | out_uleb128 (insn->u.rr.reg2); |
1750 | 0 | break; |
1751 | | |
1752 | 0 | case DW_CFA_remember_state: |
1753 | 0 | case DW_CFA_restore_state: |
1754 | 0 | out_one (insn->insn); |
1755 | 0 | break; |
1756 | | |
1757 | 0 | case DW_CFA_GNU_window_save: |
1758 | 0 | out_one (DW_CFA_GNU_window_save); |
1759 | 0 | break; |
1760 | | |
1761 | 0 | case CFI_escape: |
1762 | 0 | { |
1763 | 0 | struct cfi_escape_data *e; |
1764 | 0 | for (e = insn->u.esc; e ; e = e->next) |
1765 | 0 | emit_expr (&e->exp, 1); |
1766 | 0 | break; |
1767 | 0 | } |
1768 | | |
1769 | 0 | case CFI_val_encoded_addr: |
1770 | 0 | { |
1771 | 0 | unsigned encoding = insn->u.ea.encoding; |
1772 | 0 | offsetT enc_size; |
1773 | |
|
1774 | 0 | if (encoding == DW_EH_PE_omit) |
1775 | 0 | break; |
1776 | 0 | out_one (DW_CFA_val_expression); |
1777 | 0 | out_uleb128 (insn->u.ea.reg); |
1778 | |
|
1779 | 0 | switch (encoding & 0x7) |
1780 | 0 | { |
1781 | 0 | case DW_EH_PE_absptr: |
1782 | 0 | enc_size = DWARF2_ADDR_SIZE (stdoutput); |
1783 | 0 | break; |
1784 | 0 | case DW_EH_PE_udata2: |
1785 | 0 | enc_size = 2; |
1786 | 0 | break; |
1787 | 0 | case DW_EH_PE_udata4: |
1788 | 0 | enc_size = 4; |
1789 | 0 | break; |
1790 | 0 | case DW_EH_PE_udata8: |
1791 | 0 | enc_size = 8; |
1792 | 0 | break; |
1793 | 0 | default: |
1794 | 0 | abort (); |
1795 | 0 | } |
1796 | | |
1797 | | /* If the user has requested absolute encoding, |
1798 | | then use the smaller DW_OP_addr encoding. */ |
1799 | 0 | if (insn->u.ea.encoding == DW_EH_PE_absptr) |
1800 | 0 | { |
1801 | 0 | out_uleb128 (1 + enc_size); |
1802 | 0 | out_one (DW_OP_addr); |
1803 | 0 | } |
1804 | 0 | else |
1805 | 0 | { |
1806 | 0 | out_uleb128 (1 + 1 + enc_size); |
1807 | 0 | out_one (DW_OP_GNU_encoded_addr); |
1808 | 0 | out_one (encoding); |
1809 | |
|
1810 | 0 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
1811 | 0 | { |
1812 | 0 | #if CFI_DIFF_EXPR_OK |
1813 | 0 | insn->u.ea.exp.X_op = O_subtract; |
1814 | 0 | insn->u.ea.exp.X_op_symbol = symbol_temp_new_now (); |
1815 | | #elif defined (tc_cfi_emit_pcrel_expr) |
1816 | | tc_cfi_emit_pcrel_expr (&insn->u.ea.exp, enc_size); |
1817 | | break; |
1818 | | #else |
1819 | | abort (); |
1820 | | #endif |
1821 | 0 | } |
1822 | 0 | } |
1823 | 0 | emit_expr (&insn->u.ea.exp, enc_size); |
1824 | 0 | } |
1825 | 0 | break; |
1826 | | |
1827 | 0 | case CFI_label: |
1828 | 0 | colon (insn->u.sym_name); |
1829 | 0 | break; |
1830 | | |
1831 | 0 | default: |
1832 | 0 | abort (); |
1833 | 1.44k | } |
1834 | 1.44k | } |
1835 | | |
1836 | | static void |
1837 | | output_cie (struct cie_entry *cie, bool eh_frame, int align) |
1838 | 722 | { |
1839 | 722 | symbolS *after_size_address, *end_address; |
1840 | 722 | expressionS exp; |
1841 | 722 | struct cfi_insn_data *i; |
1842 | 722 | offsetT augmentation_size; |
1843 | 722 | int enc; |
1844 | 722 | enum dwarf2_format fmt = DWARF2_FORMAT (now_seg); |
1845 | | |
1846 | 722 | cie->start_address = symbol_temp_new_now (); |
1847 | 722 | after_size_address = symbol_temp_make (); |
1848 | 722 | end_address = symbol_temp_make (); |
1849 | | |
1850 | 722 | exp.X_op = O_subtract; |
1851 | 722 | exp.X_add_symbol = end_address; |
1852 | 722 | exp.X_op_symbol = after_size_address; |
1853 | 722 | exp.X_add_number = 0; |
1854 | | |
1855 | 722 | if (eh_frame || fmt == dwarf2_format_32bit) |
1856 | 722 | emit_expr (&exp, 4); /* Length. */ |
1857 | 0 | else |
1858 | 0 | { |
1859 | 0 | if (fmt == dwarf2_format_64bit) |
1860 | 0 | out_four (-1); |
1861 | 0 | emit_expr (&exp, 8); /* Length. */ |
1862 | 0 | } |
1863 | 722 | symbol_set_value_now (after_size_address); |
1864 | 722 | if (eh_frame) |
1865 | 722 | out_four (0); /* CIE id. */ |
1866 | 0 | else |
1867 | 0 | { |
1868 | 0 | out_four (-1); /* CIE id. */ |
1869 | 0 | if (fmt != dwarf2_format_32bit) |
1870 | 0 | out_four (-1); |
1871 | 0 | } |
1872 | 722 | out_one (flag_dwarf_cie_version); /* Version. */ |
1873 | 722 | if (eh_frame) |
1874 | 722 | { |
1875 | 722 | out_one ('z'); /* Augmentation. */ |
1876 | 722 | if (cie->per_encoding != DW_EH_PE_omit) |
1877 | 0 | out_one ('P'); |
1878 | 722 | if (cie->lsda_encoding != DW_EH_PE_omit) |
1879 | 0 | out_one ('L'); |
1880 | 722 | out_one ('R'); |
1881 | | #ifdef tc_output_cie_extra |
1882 | | tc_output_cie_extra (cie); |
1883 | | #endif |
1884 | 722 | } |
1885 | 722 | if (cie->signal_frame) |
1886 | 0 | out_one ('S'); |
1887 | 722 | out_one (0); |
1888 | 722 | if (flag_dwarf_cie_version >= 4) |
1889 | 0 | { |
1890 | | /* For now we are assuming a flat address space with 4 or 8 byte |
1891 | | addresses. */ |
1892 | 0 | int address_size = dwarf2_format_32bit ? 4 : 8; |
1893 | 0 | out_one (address_size); /* Address size. */ |
1894 | 0 | out_one (0); /* Segment size. */ |
1895 | 0 | } |
1896 | 722 | out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */ |
1897 | 722 | out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */ |
1898 | 722 | if (flag_dwarf_cie_version == 1) /* Return column. */ |
1899 | 722 | { |
1900 | 722 | if ((cie->return_column & 0xff) != cie->return_column) |
1901 | 0 | as_bad (_("return column number %d overflows in CIE version 1"), |
1902 | 0 | cie->return_column); |
1903 | 722 | out_one (cie->return_column); |
1904 | 722 | } |
1905 | 0 | else |
1906 | 0 | out_uleb128 (cie->return_column); |
1907 | 722 | if (eh_frame) |
1908 | 722 | { |
1909 | 722 | augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit); |
1910 | 722 | if (cie->per_encoding != DW_EH_PE_omit) |
1911 | 0 | augmentation_size += 1 + encoding_size (cie->per_encoding); |
1912 | 722 | out_uleb128 (augmentation_size); /* Augmentation size. */ |
1913 | | |
1914 | 722 | emit_expr_encoded (&cie->personality, cie->per_encoding, true); |
1915 | | |
1916 | 722 | if (cie->lsda_encoding != DW_EH_PE_omit) |
1917 | 0 | out_one (cie->lsda_encoding); |
1918 | 722 | } |
1919 | | |
1920 | 722 | switch (DWARF2_FDE_RELOC_SIZE) |
1921 | 722 | { |
1922 | 0 | case 2: |
1923 | 0 | enc = DW_EH_PE_sdata2; |
1924 | 0 | break; |
1925 | 722 | case 4: |
1926 | 722 | enc = DW_EH_PE_sdata4; |
1927 | 722 | break; |
1928 | 0 | case 8: |
1929 | 0 | enc = DW_EH_PE_sdata8; |
1930 | 0 | break; |
1931 | 0 | default: |
1932 | 0 | abort (); |
1933 | 722 | } |
1934 | 722 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
1935 | 722 | enc |= DW_EH_PE_pcrel; |
1936 | 722 | #endif |
1937 | | #ifdef DWARF2_FDE_RELOC_ENCODING |
1938 | | /* Allow target to override encoding. */ |
1939 | | enc = DWARF2_FDE_RELOC_ENCODING (enc); |
1940 | | #endif |
1941 | 722 | cie->fde_encoding = enc; |
1942 | 722 | if (eh_frame) |
1943 | 722 | out_one (enc); |
1944 | | |
1945 | 722 | if (cie->first) |
1946 | 722 | { |
1947 | 2.16k | for (i = cie->first; i != cie->last; i = i->next) |
1948 | 1.44k | { |
1949 | 1.44k | if (CUR_SEG (i) != CUR_SEG (cie)) |
1950 | 0 | continue; |
1951 | 1.44k | output_cfi_insn (i); |
1952 | 1.44k | } |
1953 | 722 | } |
1954 | | |
1955 | 722 | frag_align (align, DW_CFA_nop, 0); |
1956 | 722 | symbol_set_value_now (end_address); |
1957 | 722 | } |
1958 | | |
1959 | | static void |
1960 | | output_fde (struct fde_entry *fde, struct cie_entry *cie, |
1961 | | bool eh_frame, struct cfi_insn_data *first, |
1962 | | int align) |
1963 | 26.8k | { |
1964 | 26.8k | symbolS *after_size_address, *end_address; |
1965 | 26.8k | expressionS exp; |
1966 | 26.8k | offsetT augmentation_size; |
1967 | 26.8k | enum dwarf2_format fmt = DWARF2_FORMAT (now_seg); |
1968 | 26.8k | unsigned int offset_size; |
1969 | 26.8k | unsigned int addr_size; |
1970 | | |
1971 | 26.8k | after_size_address = symbol_temp_make (); |
1972 | 26.8k | end_address = symbol_temp_make (); |
1973 | | |
1974 | 26.8k | exp.X_op = O_subtract; |
1975 | 26.8k | exp.X_add_symbol = end_address; |
1976 | 26.8k | exp.X_op_symbol = after_size_address; |
1977 | 26.8k | exp.X_add_number = 0; |
1978 | 26.8k | if (eh_frame || fmt == dwarf2_format_32bit) |
1979 | 26.8k | offset_size = 4; |
1980 | 0 | else |
1981 | 0 | { |
1982 | 0 | if (fmt == dwarf2_format_64bit) |
1983 | 0 | out_four (-1); |
1984 | 0 | offset_size = 8; |
1985 | 0 | } |
1986 | 26.8k | emit_expr (&exp, offset_size); /* Length. */ |
1987 | 26.8k | symbol_set_value_now (after_size_address); |
1988 | | |
1989 | 26.8k | if (eh_frame) |
1990 | 26.8k | { |
1991 | 26.8k | exp.X_op = O_subtract; |
1992 | 26.8k | exp.X_add_symbol = after_size_address; |
1993 | 26.8k | exp.X_op_symbol = cie->start_address; |
1994 | 26.8k | exp.X_add_number = 0; |
1995 | 26.8k | emit_expr (&exp, offset_size); /* CIE offset. */ |
1996 | 26.8k | } |
1997 | 0 | else |
1998 | 0 | { |
1999 | 0 | TC_DWARF2_EMIT_OFFSET (cie->start_address, offset_size); |
2000 | 0 | } |
2001 | | |
2002 | 26.8k | exp.X_op = O_symbol; |
2003 | 26.8k | if (eh_frame) |
2004 | 26.8k | { |
2005 | 26.8k | bfd_reloc_code_real_type code |
2006 | 26.8k | = tc_cfi_reloc_for_encoding (cie->fde_encoding); |
2007 | 26.8k | addr_size = DWARF2_FDE_RELOC_SIZE; |
2008 | 26.8k | if (code != BFD_RELOC_NONE) |
2009 | 0 | { |
2010 | 0 | reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code); |
2011 | 0 | char *p = frag_more (addr_size); |
2012 | 0 | gas_assert (addr_size == (unsigned) howto->bitsize / 8); |
2013 | 0 | md_number_to_chars (p, 0, addr_size); |
2014 | 0 | fix_new (frag_now, p - frag_now->fr_literal, addr_size, |
2015 | 0 | fde->start_address, 0, howto->pc_relative, code); |
2016 | 0 | } |
2017 | 26.8k | else |
2018 | 26.8k | { |
2019 | 26.8k | exp.X_op = O_subtract; |
2020 | 26.8k | exp.X_add_number = 0; |
2021 | 26.8k | #if CFI_DIFF_EXPR_OK |
2022 | 26.8k | exp.X_add_symbol = fde->start_address; |
2023 | 26.8k | exp.X_op_symbol = symbol_temp_new_now (); |
2024 | 26.8k | emit_expr (&exp, addr_size); /* Code offset. */ |
2025 | | #else |
2026 | | exp.X_op = O_symbol; |
2027 | | exp.X_add_symbol = fde->start_address; |
2028 | | |
2029 | | #if defined(tc_cfi_emit_pcrel_expr) |
2030 | | tc_cfi_emit_pcrel_expr (&exp, addr_size); /* Code offset. */ |
2031 | | #else |
2032 | | emit_expr (&exp, addr_size); /* Code offset. */ |
2033 | | #endif |
2034 | | #endif |
2035 | 26.8k | } |
2036 | 26.8k | } |
2037 | 0 | else |
2038 | 0 | { |
2039 | 0 | exp.X_add_number = 0; |
2040 | 0 | exp.X_add_symbol = fde->start_address; |
2041 | 0 | addr_size = DWARF2_ADDR_SIZE (stdoutput); |
2042 | 0 | emit_expr (&exp, addr_size); |
2043 | 0 | } |
2044 | | |
2045 | 26.8k | exp.X_op = O_subtract; |
2046 | 26.8k | exp.X_add_symbol = fde->end_address; |
2047 | 26.8k | exp.X_op_symbol = fde->start_address; /* Code length. */ |
2048 | 26.8k | exp.X_add_number = 0; |
2049 | 26.8k | emit_expr (&exp, addr_size); |
2050 | | |
2051 | 26.8k | augmentation_size = encoding_size (fde->lsda_encoding); |
2052 | 26.8k | if (eh_frame) |
2053 | 26.8k | out_uleb128 (augmentation_size); /* Augmentation size. */ |
2054 | | |
2055 | 26.8k | emit_expr_encoded (&fde->lsda, cie->lsda_encoding, false); |
2056 | | |
2057 | 26.8k | for (; first; first = first->next) |
2058 | 0 | if (CUR_SEG (first) == CUR_SEG (fde)) |
2059 | 0 | output_cfi_insn (first); |
2060 | | |
2061 | 26.8k | frag_align (align, DW_CFA_nop, 0); |
2062 | 26.8k | symbol_set_value_now (end_address); |
2063 | 26.8k | } |
2064 | | |
2065 | | /* Allow these insns to be put in the initial sequence of a CIE. |
2066 | | If J is non-NULL, then compare I and J insns for a match. */ |
2067 | | |
2068 | | static inline bool |
2069 | | initial_cie_insn (const struct cfi_insn_data *i, const struct cfi_insn_data *j) |
2070 | 53.6k | { |
2071 | 53.6k | if (j && i->insn != j->insn) |
2072 | 0 | return false; |
2073 | 53.6k | switch (i->insn) |
2074 | 53.6k | { |
2075 | 26.8k | case DW_CFA_offset: |
2076 | 53.6k | case DW_CFA_def_cfa: |
2077 | 53.6k | case DW_CFA_val_offset: |
2078 | 53.6k | if (j) |
2079 | 52.2k | { |
2080 | 52.2k | if (i->u.ri.reg != j->u.ri.reg) |
2081 | 0 | return false; |
2082 | 52.2k | if (i->u.ri.offset != j->u.ri.offset) |
2083 | 0 | return false; |
2084 | 52.2k | } |
2085 | 53.6k | break; |
2086 | | |
2087 | 53.6k | case DW_CFA_register: |
2088 | 0 | if (j) |
2089 | 0 | { |
2090 | 0 | if (i->u.rr.reg1 != j->u.rr.reg1) |
2091 | 0 | return false; |
2092 | 0 | if (i->u.rr.reg2 != j->u.rr.reg2) |
2093 | 0 | return false; |
2094 | 0 | } |
2095 | 0 | break; |
2096 | | |
2097 | 0 | case DW_CFA_def_cfa_register: |
2098 | 0 | case DW_CFA_restore: |
2099 | 0 | case DW_CFA_undefined: |
2100 | 0 | case DW_CFA_same_value: |
2101 | 0 | if (j) |
2102 | 0 | { |
2103 | 0 | if (i->u.r != j->u.r) |
2104 | 0 | return false; |
2105 | 0 | } |
2106 | 0 | break; |
2107 | | |
2108 | 0 | case DW_CFA_def_cfa_offset: |
2109 | 0 | if (j) |
2110 | 0 | { |
2111 | 0 | if (i->u.i != j->u.i) |
2112 | 0 | return false; |
2113 | 0 | } |
2114 | 0 | break; |
2115 | | |
2116 | 0 | default: |
2117 | 0 | return false; |
2118 | 53.6k | } |
2119 | 53.6k | return true; |
2120 | 53.6k | } |
2121 | | |
2122 | | static struct cie_entry * |
2123 | | select_cie_for_fde (struct fde_entry *fde, bool eh_frame, |
2124 | | struct cfi_insn_data **pfirst, int align) |
2125 | 26.8k | { |
2126 | 26.8k | struct cfi_insn_data *i, *j; |
2127 | 26.8k | struct cie_entry *cie; |
2128 | | |
2129 | 26.8k | for (cie = cie_root; cie; cie = cie->next) |
2130 | 26.1k | { |
2131 | 26.1k | if (CUR_SEG (cie) != CUR_SEG (fde)) |
2132 | 0 | continue; |
2133 | | #ifdef tc_cie_fde_equivalent_extra |
2134 | | if (!tc_cie_fde_equivalent_extra (cie, fde)) |
2135 | | continue; |
2136 | | #endif |
2137 | 26.1k | if (cie->return_column != fde->return_column |
2138 | 26.1k | || cie->signal_frame != fde->signal_frame |
2139 | 26.1k | || cie->per_encoding != fde->per_encoding |
2140 | 26.1k | || cie->lsda_encoding != fde->lsda_encoding) |
2141 | 0 | continue; |
2142 | 26.1k | if (cie->per_encoding != DW_EH_PE_omit) |
2143 | 0 | { |
2144 | 0 | if (cie->personality.X_op != fde->personality.X_op |
2145 | 0 | || (cie->personality.X_add_number |
2146 | 0 | != fde->personality.X_add_number)) |
2147 | 0 | continue; |
2148 | 0 | switch (cie->personality.X_op) |
2149 | 0 | { |
2150 | 0 | case O_constant: |
2151 | 0 | if (cie->personality.X_unsigned != fde->personality.X_unsigned) |
2152 | 0 | continue; |
2153 | 0 | break; |
2154 | 0 | case O_symbol: |
2155 | 0 | if (cie->personality.X_add_symbol |
2156 | 0 | != fde->personality.X_add_symbol) |
2157 | 0 | continue; |
2158 | 0 | break; |
2159 | 0 | default: |
2160 | 0 | abort (); |
2161 | 0 | } |
2162 | 0 | } |
2163 | 26.1k | for (i = cie->first, j = fde->data; |
2164 | 78.3k | i != cie->last && j != NULL; |
2165 | 52.2k | i = i->next, j = j->next) |
2166 | 52.2k | { |
2167 | 52.2k | if (!initial_cie_insn (i, j)) |
2168 | 0 | break; |
2169 | 52.2k | } |
2170 | | |
2171 | 26.1k | if (i == cie->last) |
2172 | 26.1k | { |
2173 | 26.1k | *pfirst = j; |
2174 | 26.1k | return cie; |
2175 | 26.1k | } |
2176 | 26.1k | } |
2177 | | |
2178 | 722 | cie = XNEW (struct cie_entry); |
2179 | 722 | cie->next = cie_root; |
2180 | 722 | cie_root = cie; |
2181 | 722 | SET_CUR_SEG (cie, CUR_SEG (fde)); |
2182 | 722 | cie->return_column = fde->return_column; |
2183 | 722 | cie->signal_frame = fde->signal_frame; |
2184 | 722 | cie->per_encoding = fde->per_encoding; |
2185 | 722 | cie->lsda_encoding = fde->lsda_encoding; |
2186 | 722 | cie->personality = fde->personality; |
2187 | 722 | cie->first = fde->data; |
2188 | | #ifdef tc_cie_entry_init_extra |
2189 | | tc_cie_entry_init_extra (cie, fde) |
2190 | | #endif |
2191 | | |
2192 | 2.16k | for (i = cie->first; i ; i = i->next) |
2193 | 1.44k | if (!initial_cie_insn (i, NULL)) |
2194 | 0 | break; |
2195 | | |
2196 | 722 | cie->last = i; |
2197 | 722 | *pfirst = i; |
2198 | | |
2199 | 722 | output_cie (cie, eh_frame, align); |
2200 | | |
2201 | 722 | return cie; |
2202 | 26.8k | } |
2203 | | |
2204 | | #ifdef md_reg_eh_frame_to_debug_frame |
2205 | | static void |
2206 | | cfi_change_reg_numbers (struct cfi_insn_data *insn, segT ccseg) |
2207 | | { |
2208 | | for (; insn; insn = insn->next) |
2209 | | { |
2210 | | if (CUR_SEG (insn) != ccseg) |
2211 | | continue; |
2212 | | switch (insn->insn) |
2213 | | { |
2214 | | case DW_CFA_advance_loc: |
2215 | | case DW_CFA_def_cfa_offset: |
2216 | | case DW_CFA_remember_state: |
2217 | | case DW_CFA_restore_state: |
2218 | | case DW_CFA_GNU_window_save: |
2219 | | case CFI_escape: |
2220 | | case CFI_label: |
2221 | | break; |
2222 | | |
2223 | | case DW_CFA_def_cfa: |
2224 | | case DW_CFA_offset: |
2225 | | insn->u.ri.reg = md_reg_eh_frame_to_debug_frame (insn->u.ri.reg); |
2226 | | break; |
2227 | | |
2228 | | case DW_CFA_def_cfa_register: |
2229 | | case DW_CFA_undefined: |
2230 | | case DW_CFA_same_value: |
2231 | | case DW_CFA_restore: |
2232 | | insn->u.r = md_reg_eh_frame_to_debug_frame (insn->u.r); |
2233 | | break; |
2234 | | |
2235 | | case DW_CFA_register: |
2236 | | insn->u.rr.reg1 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg1); |
2237 | | insn->u.rr.reg2 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg2); |
2238 | | break; |
2239 | | |
2240 | | case CFI_val_encoded_addr: |
2241 | | insn->u.ea.reg = md_reg_eh_frame_to_debug_frame (insn->u.ea.reg); |
2242 | | break; |
2243 | | |
2244 | | default: |
2245 | | abort (); |
2246 | | } |
2247 | | } |
2248 | | } |
2249 | | #else |
2250 | 0 | #define cfi_change_reg_numbers(insn, cseg) do { } while (0) |
2251 | | #endif |
2252 | | |
2253 | | #if SUPPORT_COMPACT_EH |
2254 | | static void |
2255 | | cfi_emit_eh_header (symbolS *sym, bfd_vma addend) |
2256 | | { |
2257 | | expressionS exp; |
2258 | | |
2259 | | exp.X_add_number = addend; |
2260 | | exp.X_add_symbol = sym; |
2261 | | emit_expr_encoded (&exp, DW_EH_PE_sdata4 | DW_EH_PE_pcrel, false); |
2262 | | } |
2263 | | |
2264 | | static void |
2265 | | output_eh_header (struct fde_entry *fde) |
2266 | | { |
2267 | | char *p; |
2268 | | bfd_vma addend; |
2269 | | |
2270 | | if (fde->eh_header_type == EH_COMPACT_INLINE) |
2271 | | addend = 0; |
2272 | | else |
2273 | | addend = 1; |
2274 | | |
2275 | | cfi_emit_eh_header (fde->start_address, addend); |
2276 | | |
2277 | | if (fde->eh_header_type == EH_COMPACT_INLINE) |
2278 | | { |
2279 | | p = frag_more (4); |
2280 | | /* Inline entries always use PR1. */ |
2281 | | *(p++) = 1; |
2282 | | memcpy(p, fde->eh_data, 3); |
2283 | | } |
2284 | | else |
2285 | | { |
2286 | | if (fde->eh_header_type == EH_COMPACT_LEGACY) |
2287 | | addend = 1; |
2288 | | else if (fde->eh_header_type == EH_COMPACT_OUTLINE |
2289 | | || fde->eh_header_type == EH_COMPACT_OUTLINE_DONE) |
2290 | | addend = 0; |
2291 | | else |
2292 | | abort (); |
2293 | | cfi_emit_eh_header (fde->eh_loc, addend); |
2294 | | } |
2295 | | } |
2296 | | #endif |
2297 | | |
2298 | | void |
2299 | | cfi_finish (void) |
2300 | 736 | { |
2301 | 736 | struct cie_entry *cie, *cie_next; |
2302 | 736 | segT cfi_seg, ccseg; |
2303 | 736 | struct fde_entry *fde; |
2304 | 736 | struct cfi_insn_data *first; |
2305 | 736 | int save_flag_traditional_format, seek_next_seg; |
2306 | | |
2307 | 736 | if (all_fde_data == 0) |
2308 | 14 | return; |
2309 | | |
2310 | 722 | if ((all_cfi_sections & CFI_EMIT_eh_frame) != 0 |
2311 | 722 | || (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 0) |
2312 | 722 | { |
2313 | | /* Make sure check_eh_frame doesn't do anything with our output. */ |
2314 | 722 | save_flag_traditional_format = flag_traditional_format; |
2315 | 722 | flag_traditional_format = 1; |
2316 | | |
2317 | 722 | if (!EH_FRAME_LINKONCE) |
2318 | 722 | { |
2319 | | /* Open .eh_frame section. */ |
2320 | 722 | cfi_seg = get_cfi_seg (NULL, ".eh_frame", |
2321 | 722 | (SEC_ALLOC | SEC_LOAD | SEC_DATA |
2322 | 722 | | DWARF2_EH_FRAME_READ_ONLY), |
2323 | 722 | EH_FRAME_ALIGNMENT); |
2324 | | #ifdef md_fix_up_eh_frame |
2325 | | md_fix_up_eh_frame (cfi_seg); |
2326 | | #else |
2327 | 722 | (void) cfi_seg; |
2328 | 722 | #endif |
2329 | 722 | } |
2330 | | |
2331 | 722 | do |
2332 | 722 | { |
2333 | 722 | ccseg = NULL; |
2334 | 722 | seek_next_seg = 0; |
2335 | | |
2336 | 1.44k | for (cie = cie_root; cie; cie = cie_next) |
2337 | 721 | { |
2338 | 721 | cie_next = cie->next; |
2339 | 721 | free ((void *) cie); |
2340 | 721 | } |
2341 | 722 | cie_root = NULL; |
2342 | | |
2343 | 27.5k | for (fde = all_fde_data; fde ; fde = fde->next) |
2344 | 26.8k | { |
2345 | 26.8k | if ((fde->sections & CFI_EMIT_eh_frame) == 0 |
2346 | 26.8k | && (fde->sections & CFI_EMIT_eh_frame_compact) == 0) |
2347 | 0 | continue; |
2348 | | |
2349 | | #if SUPPORT_COMPACT_EH |
2350 | | /* Emit a LEGACY format header if we have processed all |
2351 | | of the .cfi directives without encountering either inline or |
2352 | | out-of-line compact unwinding opcodes. */ |
2353 | | if (fde->eh_header_type == EH_COMPACT_HAS_LSDA |
2354 | | || fde->eh_header_type == EH_COMPACT_UNKNOWN) |
2355 | | fde->eh_header_type = EH_COMPACT_LEGACY; |
2356 | | |
2357 | | if (fde->eh_header_type != EH_COMPACT_LEGACY) |
2358 | | continue; |
2359 | | #endif |
2360 | 26.8k | if (EH_FRAME_LINKONCE) |
2361 | 0 | { |
2362 | 0 | if (HANDLED (fde)) |
2363 | 0 | continue; |
2364 | 0 | if (seek_next_seg && CUR_SEG (fde) != ccseg) |
2365 | 0 | { |
2366 | 0 | seek_next_seg = 2; |
2367 | 0 | continue; |
2368 | 0 | } |
2369 | 0 | if (!seek_next_seg) |
2370 | 0 | { |
2371 | 0 | ccseg = CUR_SEG (fde); |
2372 | | /* Open .eh_frame section. */ |
2373 | 0 | cfi_seg = get_cfi_seg (ccseg, ".eh_frame", |
2374 | 0 | (SEC_ALLOC | SEC_LOAD | SEC_DATA |
2375 | 0 | | DWARF2_EH_FRAME_READ_ONLY), |
2376 | 0 | EH_FRAME_ALIGNMENT); |
2377 | | #ifdef md_fix_up_eh_frame |
2378 | | md_fix_up_eh_frame (cfi_seg); |
2379 | | #else |
2380 | 0 | (void) cfi_seg; |
2381 | 0 | #endif |
2382 | 0 | seek_next_seg = 1; |
2383 | 0 | } |
2384 | 0 | SET_HANDLED (fde, 1); |
2385 | 0 | } |
2386 | | |
2387 | 26.8k | if (fde->end_address == NULL) |
2388 | 62 | { |
2389 | 62 | as_bad (_("open CFI at the end of file; " |
2390 | 62 | "missing .cfi_endproc directive")); |
2391 | 62 | fde->end_address = fde->start_address; |
2392 | 62 | } |
2393 | | |
2394 | 26.8k | cie = select_cie_for_fde (fde, true, &first, 2); |
2395 | 26.8k | fde->eh_loc = symbol_temp_new_now (); |
2396 | 26.8k | output_fde (fde, cie, true, first, |
2397 | 26.8k | fde->next == NULL ? EH_FRAME_ALIGNMENT : 2); |
2398 | 26.8k | } |
2399 | 722 | } |
2400 | 722 | while (EH_FRAME_LINKONCE && seek_next_seg == 2); |
2401 | | |
2402 | 722 | if (EH_FRAME_LINKONCE) |
2403 | 0 | for (fde = all_fde_data; fde ; fde = fde->next) |
2404 | 0 | SET_HANDLED (fde, 0); |
2405 | | |
2406 | | #if SUPPORT_COMPACT_EH |
2407 | | if (compact_eh) |
2408 | | { |
2409 | | /* Create remaining out of line table entries. */ |
2410 | | do |
2411 | | { |
2412 | | ccseg = NULL; |
2413 | | seek_next_seg = 0; |
2414 | | |
2415 | | for (fde = all_fde_data; fde ; fde = fde->next) |
2416 | | { |
2417 | | if ((fde->sections & CFI_EMIT_eh_frame) == 0 |
2418 | | && (fde->sections & CFI_EMIT_eh_frame_compact) == 0) |
2419 | | continue; |
2420 | | |
2421 | | if (fde->eh_header_type != EH_COMPACT_OUTLINE) |
2422 | | continue; |
2423 | | if (HANDLED (fde)) |
2424 | | continue; |
2425 | | if (seek_next_seg && CUR_SEG (fde) != ccseg) |
2426 | | { |
2427 | | seek_next_seg = 2; |
2428 | | continue; |
2429 | | } |
2430 | | if (!seek_next_seg) |
2431 | | { |
2432 | | ccseg = CUR_SEG (fde); |
2433 | | /* Open .gnu_extab section. */ |
2434 | | get_cfi_seg (ccseg, ".gnu_extab", |
2435 | | (SEC_ALLOC | SEC_LOAD | SEC_DATA |
2436 | | | DWARF2_EH_FRAME_READ_ONLY), |
2437 | | 1); |
2438 | | seek_next_seg = 1; |
2439 | | } |
2440 | | SET_HANDLED (fde, 1); |
2441 | | |
2442 | | frag_align (1, 0, 0); |
2443 | | record_alignment (now_seg, 1); |
2444 | | output_compact_unwind_data (fde, 1); |
2445 | | } |
2446 | | } |
2447 | | while (EH_FRAME_LINKONCE && seek_next_seg == 2); |
2448 | | |
2449 | | for (fde = all_fde_data; fde ; fde = fde->next) |
2450 | | SET_HANDLED (fde, 0); |
2451 | | |
2452 | | /* Create index table fragments. */ |
2453 | | do |
2454 | | { |
2455 | | ccseg = NULL; |
2456 | | seek_next_seg = 0; |
2457 | | |
2458 | | for (fde = all_fde_data; fde ; fde = fde->next) |
2459 | | { |
2460 | | if ((fde->sections & CFI_EMIT_eh_frame) == 0 |
2461 | | && (fde->sections & CFI_EMIT_eh_frame_compact) == 0) |
2462 | | continue; |
2463 | | |
2464 | | if (HANDLED (fde)) |
2465 | | continue; |
2466 | | if (seek_next_seg && CUR_SEG (fde) != ccseg) |
2467 | | { |
2468 | | seek_next_seg = 2; |
2469 | | continue; |
2470 | | } |
2471 | | if (!seek_next_seg) |
2472 | | { |
2473 | | ccseg = CUR_SEG (fde); |
2474 | | /* Open .eh_frame_entry section. */ |
2475 | | cfi_seg = get_cfi_seg (ccseg, ".eh_frame_entry", |
2476 | | (SEC_ALLOC | SEC_LOAD | SEC_DATA |
2477 | | | DWARF2_EH_FRAME_READ_ONLY), |
2478 | | 2); |
2479 | | seek_next_seg = 1; |
2480 | | } |
2481 | | SET_HANDLED (fde, 1); |
2482 | | |
2483 | | output_eh_header (fde); |
2484 | | } |
2485 | | } |
2486 | | while (seek_next_seg == 2); |
2487 | | |
2488 | | for (fde = all_fde_data; fde ; fde = fde->next) |
2489 | | SET_HANDLED (fde, 0); |
2490 | | } |
2491 | | #endif /* SUPPORT_COMPACT_EH */ |
2492 | | |
2493 | 722 | flag_traditional_format = save_flag_traditional_format; |
2494 | 722 | } |
2495 | | |
2496 | | /* Generate SFrame section if the user specifies: |
2497 | | - the command line option to gas, or |
2498 | | - .sframe in the .cfi_sections directive. */ |
2499 | 722 | if (flag_gen_sframe || (all_cfi_sections & CFI_EMIT_sframe) != 0) |
2500 | 0 | { |
2501 | 0 | if (support_sframe_p ()) |
2502 | 0 | { |
2503 | 0 | segT sframe_seg; |
2504 | 0 | int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1; |
2505 | |
|
2506 | 0 | if (!SUPPORT_FRAME_LINKONCE) |
2507 | 0 | sframe_seg = get_cfi_seg (NULL, ".sframe", |
2508 | 0 | (SEC_ALLOC | SEC_LOAD | SEC_DATA |
2509 | 0 | | DWARF2_EH_FRAME_READ_ONLY), |
2510 | 0 | alignment); |
2511 | 0 | output_sframe (sframe_seg); |
2512 | 0 | } |
2513 | 0 | else |
2514 | 0 | as_bad (_(".sframe not supported for target")); |
2515 | 0 | } |
2516 | | |
2517 | 722 | if ((all_cfi_sections & CFI_EMIT_debug_frame) != 0) |
2518 | 0 | { |
2519 | 0 | int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1; |
2520 | |
|
2521 | 0 | if (!SUPPORT_FRAME_LINKONCE) |
2522 | 0 | get_cfi_seg (NULL, ".debug_frame", |
2523 | 0 | SEC_READONLY | SEC_DEBUGGING, |
2524 | 0 | alignment); |
2525 | |
|
2526 | 0 | do |
2527 | 0 | { |
2528 | 0 | ccseg = NULL; |
2529 | 0 | seek_next_seg = 0; |
2530 | |
|
2531 | 0 | for (cie = cie_root; cie; cie = cie_next) |
2532 | 0 | { |
2533 | 0 | cie_next = cie->next; |
2534 | 0 | free ((void *) cie); |
2535 | 0 | } |
2536 | 0 | cie_root = NULL; |
2537 | |
|
2538 | 0 | for (fde = all_fde_data; fde ; fde = fde->next) |
2539 | 0 | { |
2540 | 0 | if ((fde->sections & CFI_EMIT_debug_frame) == 0) |
2541 | 0 | continue; |
2542 | | |
2543 | 0 | if (SUPPORT_FRAME_LINKONCE) |
2544 | 0 | { |
2545 | 0 | if (HANDLED (fde)) |
2546 | 0 | continue; |
2547 | 0 | if (seek_next_seg && CUR_SEG (fde) != ccseg) |
2548 | 0 | { |
2549 | 0 | seek_next_seg = 2; |
2550 | 0 | continue; |
2551 | 0 | } |
2552 | 0 | if (!seek_next_seg) |
2553 | 0 | { |
2554 | 0 | ccseg = CUR_SEG (fde); |
2555 | | /* Open .debug_frame section. */ |
2556 | 0 | get_cfi_seg (ccseg, ".debug_frame", |
2557 | 0 | SEC_READONLY | SEC_DEBUGGING, |
2558 | 0 | alignment); |
2559 | 0 | seek_next_seg = 1; |
2560 | 0 | } |
2561 | 0 | SET_HANDLED (fde, 1); |
2562 | 0 | } |
2563 | 0 | if (fde->end_address == NULL) |
2564 | 0 | { |
2565 | 0 | as_bad (_("open CFI at the end of file; " |
2566 | 0 | "missing .cfi_endproc directive")); |
2567 | 0 | fde->end_address = fde->start_address; |
2568 | 0 | } |
2569 | |
|
2570 | 0 | fde->per_encoding = DW_EH_PE_omit; |
2571 | 0 | fde->lsda_encoding = DW_EH_PE_omit; |
2572 | 0 | cfi_change_reg_numbers (fde->data, ccseg); |
2573 | 0 | cie = select_cie_for_fde (fde, false, &first, alignment); |
2574 | 0 | output_fde (fde, cie, false, first, alignment); |
2575 | 0 | } |
2576 | 0 | } |
2577 | 0 | while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2); |
2578 | |
|
2579 | 0 | if (SUPPORT_FRAME_LINKONCE) |
2580 | 0 | for (fde = all_fde_data; fde ; fde = fde->next) |
2581 | 0 | SET_HANDLED (fde, 0); |
2582 | 0 | } |
2583 | 722 | if (dwcfi_hash) |
2584 | 0 | htab_delete (dwcfi_hash); |
2585 | 722 | } |
2586 | | |
2587 | | #else /* TARGET_USE_CFIPOP */ |
2588 | | |
2589 | | /* Emit an intelligible error message for missing support. */ |
2590 | | |
2591 | | static void |
2592 | | dot_cfi_dummy (int ignored ATTRIBUTE_UNUSED) |
2593 | | { |
2594 | | as_bad (_("CFI is not supported for this target")); |
2595 | | ignore_rest_of_line (); |
2596 | | } |
2597 | | |
2598 | | const pseudo_typeS cfi_pseudo_table[] = |
2599 | | { |
2600 | | { "cfi_sections", dot_cfi_dummy, 0 }, |
2601 | | { "cfi_startproc", dot_cfi_dummy, 0 }, |
2602 | | { "cfi_endproc", dot_cfi_dummy, 0 }, |
2603 | | { "cfi_fde_data", dot_cfi_dummy, 0 }, |
2604 | | { "cfi_def_cfa", dot_cfi_dummy, 0 }, |
2605 | | { "cfi_def_cfa_register", dot_cfi_dummy, 0 }, |
2606 | | { "cfi_def_cfa_offset", dot_cfi_dummy, 0 }, |
2607 | | { "cfi_adjust_cfa_offset", dot_cfi_dummy, 0 }, |
2608 | | { "cfi_offset", dot_cfi_dummy, 0 }, |
2609 | | { "cfi_rel_offset", dot_cfi_dummy, 0 }, |
2610 | | { "cfi_register", dot_cfi_dummy, 0 }, |
2611 | | { "cfi_return_column", dot_cfi_dummy, 0 }, |
2612 | | { "cfi_restore", dot_cfi_dummy, 0 }, |
2613 | | { "cfi_undefined", dot_cfi_dummy, 0 }, |
2614 | | { "cfi_same_value", dot_cfi_dummy, 0 }, |
2615 | | { "cfi_remember_state", dot_cfi_dummy, 0 }, |
2616 | | { "cfi_restore_state", dot_cfi_dummy, 0 }, |
2617 | | { "cfi_window_save", dot_cfi_dummy, 0 }, |
2618 | | { "cfi_escape", dot_cfi_dummy, 0 }, |
2619 | | { "cfi_signal_frame", dot_cfi_dummy, 0 }, |
2620 | | { "cfi_personality", dot_cfi_dummy, 0 }, |
2621 | | { "cfi_personality_id", dot_cfi_dummy, 0 }, |
2622 | | { "cfi_lsda", dot_cfi_dummy, 0 }, |
2623 | | { "cfi_val_encoded_addr", dot_cfi_dummy, 0 }, |
2624 | | { "cfi_label", dot_cfi_dummy, 0 }, |
2625 | | { "cfi_inline_lsda", dot_cfi_dummy, 0 }, |
2626 | | { "cfi_val_offset", dot_cfi_dummy, 0 }, |
2627 | | { NULL, NULL, 0 } |
2628 | | }; |
2629 | | |
2630 | | void |
2631 | | cfi_finish (void) |
2632 | | { |
2633 | | } |
2634 | | #endif /* TARGET_USE_CFIPOP */ |