Commit | Line | Data |
---|---|---|
54cfded0 | 1 | /* dw2gencfi.c - Support for generating Dwarf2 CFI information. |
63752a75 | 2 | Copyright 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
54cfded0 AM |
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 2, 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 | |
4b4da160 NC |
19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
54cfded0 | 21 | |
54cfded0 AM |
22 | #include "as.h" |
23 | #include "dw2gencfi.h" | |
24 | ||
a4447b93 RH |
25 | |
26 | /* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field | |
27 | of the CIE. Default to 1 if not otherwise specified. */ | |
289040ca | 28 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH |
a4447b93 RH |
29 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
30 | #endif | |
31 | ||
32 | /* If TARGET_USE_CFIPOP is defined, it is required that the target | |
33 | provide the following definitions. Otherwise provide them to | |
34 | allow compilation to continue. */ | |
35 | #ifndef TARGET_USE_CFIPOP | |
289040ca | 36 | # ifndef DWARF2_DEFAULT_RETURN_COLUMN |
a4447b93 RH |
37 | # define DWARF2_DEFAULT_RETURN_COLUMN 0 |
38 | # endif | |
289040ca | 39 | # ifndef DWARF2_CIE_DATA_ALIGNMENT |
a4447b93 RH |
40 | # define DWARF2_CIE_DATA_ALIGNMENT 1 |
41 | # endif | |
42 | #endif | |
43 | ||
9393cb0d | 44 | #ifndef EH_FRAME_ALIGNMENT |
7be1c489 | 45 | # define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2) |
9393cb0d JJ |
46 | #endif |
47 | ||
a4447b93 RH |
48 | #ifndef tc_cfi_frame_initial_instructions |
49 | # define tc_cfi_frame_initial_instructions() ((void)0) | |
50 | #endif | |
51 | ||
52 | ||
53 | struct cfi_insn_data | |
39b82151 | 54 | { |
a4447b93 RH |
55 | struct cfi_insn_data *next; |
56 | int insn; | |
57 | union { | |
58 | struct { | |
59 | unsigned reg; | |
60 | offsetT offset; | |
61 | } ri; | |
62 | ||
63 | struct { | |
64 | unsigned reg1; | |
65 | unsigned reg2; | |
66 | } rr; | |
67 | ||
68 | unsigned r; | |
69 | offsetT i; | |
70 | ||
71 | struct { | |
72 | symbolS *lab1; | |
73 | symbolS *lab2; | |
74 | } ll; | |
cdfbf930 RH |
75 | |
76 | struct cfi_escape_data { | |
77 | struct cfi_escape_data *next; | |
78 | expressionS exp; | |
79 | } *esc; | |
a4447b93 | 80 | } u; |
39b82151 ML |
81 | }; |
82 | ||
a4447b93 | 83 | struct fde_entry |
39b82151 | 84 | { |
a4447b93 RH |
85 | struct fde_entry *next; |
86 | symbolS *start_address; | |
87 | symbolS *end_address; | |
88 | struct cfi_insn_data *data; | |
89 | struct cfi_insn_data **last; | |
90 | unsigned int return_column; | |
63752a75 | 91 | unsigned int signal_frame; |
39b82151 ML |
92 | }; |
93 | ||
a4447b93 | 94 | struct cie_entry |
39b82151 | 95 | { |
a4447b93 RH |
96 | struct cie_entry *next; |
97 | symbolS *start_address; | |
98 | unsigned int return_column; | |
63752a75 | 99 | unsigned int signal_frame; |
a4447b93 | 100 | struct cfi_insn_data *first, *last; |
39b82151 ML |
101 | }; |
102 | ||
a4447b93 RH |
103 | |
104 | /* Current open FDE entry. */ | |
105 | static struct fde_entry *cur_fde_data; | |
106 | static symbolS *last_address; | |
107 | static offsetT cur_cfa_offset; | |
108 | ||
109 | /* List of FDE entries. */ | |
110 | static struct fde_entry *all_fde_data; | |
111 | static struct fde_entry **last_fde_data = &all_fde_data; | |
39b82151 ML |
112 | |
113 | /* List of CIEs so that they could be reused. */ | |
114 | static struct cie_entry *cie_root; | |
115 | ||
fa87b337 RH |
116 | /* Stack of old CFI data, for save/restore. */ |
117 | struct cfa_save_data | |
118 | { | |
119 | struct cfa_save_data *next; | |
120 | offsetT cfa_offset; | |
121 | }; | |
122 | ||
123 | static struct cfa_save_data *cfa_save_stack; | |
a4447b93 RH |
124 | \f |
125 | /* Construct a new FDE structure and add it to the end of the fde list. */ | |
54cfded0 | 126 | |
a4447b93 RH |
127 | static struct fde_entry * |
128 | alloc_fde_entry (void) | |
129 | { | |
130 | struct fde_entry *fde = xcalloc (1, sizeof (struct fde_entry)); | |
54cfded0 | 131 | |
a4447b93 RH |
132 | cur_fde_data = fde; |
133 | *last_fde_data = fde; | |
134 | last_fde_data = &fde->next; | |
54cfded0 | 135 | |
a4447b93 RH |
136 | fde->last = &fde->data; |
137 | fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN; | |
138 | ||
139 | return fde; | |
140 | } | |
141 | ||
142 | /* The following functions are available for a backend to construct its | |
143 | own unwind information, usually from legacy unwind directives. */ | |
144 | ||
145 | /* Construct a new INSN structure and add it to the end of the insn list | |
146 | for the currently active FDE. */ | |
147 | ||
148 | static struct cfi_insn_data * | |
149 | alloc_cfi_insn_data (void) | |
54cfded0 | 150 | { |
a4447b93 RH |
151 | struct cfi_insn_data *insn = xcalloc (1, sizeof (struct cfi_insn_data)); |
152 | ||
153 | *cur_fde_data->last = insn; | |
154 | cur_fde_data->last = &insn->next; | |
54cfded0 | 155 | |
a4447b93 | 156 | return insn; |
54cfded0 AM |
157 | } |
158 | ||
a4447b93 RH |
159 | /* Construct a new FDE structure that begins at LABEL. */ |
160 | ||
161 | void | |
162 | cfi_new_fde (symbolS *label) | |
54cfded0 | 163 | { |
a4447b93 RH |
164 | struct fde_entry *fde = alloc_fde_entry (); |
165 | fde->start_address = label; | |
166 | last_address = label; | |
54cfded0 AM |
167 | } |
168 | ||
a4447b93 RH |
169 | /* End the currently open FDE. */ |
170 | ||
171 | void | |
172 | cfi_end_fde (symbolS *label) | |
54cfded0 | 173 | { |
a4447b93 RH |
174 | cur_fde_data->end_address = label; |
175 | cur_fde_data = NULL; | |
54cfded0 AM |
176 | } |
177 | ||
a4447b93 RH |
178 | /* Set the return column for the current FDE. */ |
179 | ||
180 | void | |
181 | cfi_set_return_column (unsigned regno) | |
54cfded0 | 182 | { |
a4447b93 RH |
183 | cur_fde_data->return_column = regno; |
184 | } | |
54cfded0 | 185 | |
2be24b54 ML |
186 | /* Universal functions to store new instructions. */ |
187 | ||
188 | static void | |
189 | cfi_add_CFA_insn(int insn) | |
190 | { | |
191 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); | |
192 | ||
193 | insn_ptr->insn = insn; | |
194 | } | |
195 | ||
196 | static void | |
197 | cfi_add_CFA_insn_reg (int insn, unsigned regno) | |
198 | { | |
199 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); | |
200 | ||
201 | insn_ptr->insn = insn; | |
202 | insn_ptr->u.r = regno; | |
203 | } | |
204 | ||
205 | static void | |
206 | cfi_add_CFA_insn_offset (int insn, offsetT offset) | |
207 | { | |
208 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); | |
209 | ||
210 | insn_ptr->insn = insn; | |
211 | insn_ptr->u.i = offset; | |
212 | } | |
213 | ||
214 | static void | |
215 | cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2) | |
216 | { | |
217 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); | |
218 | ||
219 | insn_ptr->insn = insn; | |
220 | insn_ptr->u.rr.reg1 = reg1; | |
221 | insn_ptr->u.rr.reg2 = reg2; | |
222 | } | |
223 | ||
224 | static void | |
225 | cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset) | |
226 | { | |
227 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); | |
228 | ||
229 | insn_ptr->insn = insn; | |
230 | insn_ptr->u.ri.reg = regno; | |
231 | insn_ptr->u.ri.offset = offset; | |
232 | } | |
233 | ||
a4447b93 | 234 | /* Add a CFI insn to advance the PC from the last address to LABEL. */ |
54cfded0 | 235 | |
a4447b93 RH |
236 | void |
237 | cfi_add_advance_loc (symbolS *label) | |
238 | { | |
239 | struct cfi_insn_data *insn = alloc_cfi_insn_data (); | |
7c0295b1 | 240 | |
a4447b93 RH |
241 | insn->insn = DW_CFA_advance_loc; |
242 | insn->u.ll.lab1 = last_address; | |
243 | insn->u.ll.lab2 = label; | |
54cfded0 | 244 | |
a4447b93 RH |
245 | last_address = label; |
246 | } | |
54cfded0 | 247 | |
a4447b93 RH |
248 | /* Add a DW_CFA_offset record to the CFI data. */ |
249 | ||
250 | void | |
251 | cfi_add_CFA_offset (unsigned regno, offsetT offset) | |
252 | { | |
fa87b337 RH |
253 | unsigned int abs_data_align; |
254 | ||
2be24b54 | 255 | cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset); |
fa87b337 RH |
256 | |
257 | abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 | |
258 | ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT); | |
259 | if (offset % abs_data_align) | |
260 | as_bad (_("register save offset not a multiple of %u"), abs_data_align); | |
a4447b93 | 261 | } |
54cfded0 | 262 | |
a4447b93 | 263 | /* Add a DW_CFA_def_cfa record to the CFI data. */ |
54cfded0 | 264 | |
a4447b93 RH |
265 | void |
266 | cfi_add_CFA_def_cfa (unsigned regno, offsetT offset) | |
267 | { | |
2be24b54 | 268 | cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset); |
a4447b93 | 269 | cur_cfa_offset = offset; |
54cfded0 AM |
270 | } |
271 | ||
a4447b93 RH |
272 | /* Add a DW_CFA_register record to the CFI data. */ |
273 | ||
274 | void | |
275 | cfi_add_CFA_register (unsigned reg1, unsigned reg2) | |
54cfded0 | 276 | { |
2be24b54 | 277 | cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2); |
54cfded0 AM |
278 | } |
279 | ||
a4447b93 RH |
280 | /* Add a DW_CFA_def_cfa_register record to the CFI data. */ |
281 | ||
282 | void | |
283 | cfi_add_CFA_def_cfa_register (unsigned regno) | |
54cfded0 | 284 | { |
2be24b54 | 285 | cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno); |
54cfded0 AM |
286 | } |
287 | ||
a4447b93 RH |
288 | /* Add a DW_CFA_def_cfa_offset record to the CFI data. */ |
289 | ||
54cfded0 | 290 | void |
a4447b93 | 291 | cfi_add_CFA_def_cfa_offset (offsetT offset) |
54cfded0 | 292 | { |
2be24b54 | 293 | cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset); |
a4447b93 RH |
294 | cur_cfa_offset = offset; |
295 | } | |
54cfded0 | 296 | |
2be24b54 ML |
297 | void |
298 | cfi_add_CFA_restore (unsigned regno) | |
299 | { | |
300 | cfi_add_CFA_insn_reg (DW_CFA_restore, regno); | |
301 | } | |
302 | ||
303 | void | |
304 | cfi_add_CFA_undefined (unsigned regno) | |
305 | { | |
306 | cfi_add_CFA_insn_reg (DW_CFA_undefined, regno); | |
307 | } | |
308 | ||
309 | void | |
310 | cfi_add_CFA_same_value (unsigned regno) | |
311 | { | |
312 | cfi_add_CFA_insn_reg (DW_CFA_same_value, regno); | |
313 | } | |
314 | ||
315 | void | |
316 | cfi_add_CFA_remember_state (void) | |
317 | { | |
fa87b337 RH |
318 | struct cfa_save_data *p; |
319 | ||
2be24b54 | 320 | cfi_add_CFA_insn (DW_CFA_remember_state); |
fa87b337 RH |
321 | |
322 | p = xmalloc (sizeof (*p)); | |
323 | p->cfa_offset = cur_cfa_offset; | |
324 | p->next = cfa_save_stack; | |
325 | cfa_save_stack = p; | |
2be24b54 ML |
326 | } |
327 | ||
328 | void | |
329 | cfi_add_CFA_restore_state (void) | |
330 | { | |
fa87b337 RH |
331 | struct cfa_save_data *p; |
332 | ||
2be24b54 | 333 | cfi_add_CFA_insn (DW_CFA_restore_state); |
fa87b337 RH |
334 | |
335 | p = cfa_save_stack; | |
336 | if (p) | |
337 | { | |
338 | cur_cfa_offset = p->cfa_offset; | |
339 | cfa_save_stack = p->next; | |
340 | free (p); | |
341 | } | |
289040ca NC |
342 | else |
343 | as_bad (_("CFI state restore without previous remember")); | |
2be24b54 ML |
344 | } |
345 | ||
a4447b93 RH |
346 | \f |
347 | /* Parse CFI assembler directives. */ | |
54cfded0 | 348 | |
a4447b93 | 349 | static void dot_cfi (int); |
cdfbf930 | 350 | static void dot_cfi_escape (int); |
a4447b93 RH |
351 | static void dot_cfi_startproc (int); |
352 | static void dot_cfi_endproc (int); | |
54cfded0 | 353 | |
a4447b93 | 354 | /* Fake CFI type; outside the byte range of any real CFI insn. */ |
2be24b54 ML |
355 | #define CFI_adjust_cfa_offset 0x100 |
356 | #define CFI_return_column 0x101 | |
fa87b337 | 357 | #define CFI_rel_offset 0x102 |
cdfbf930 | 358 | #define CFI_escape 0x103 |
63752a75 | 359 | #define CFI_signal_frame 0x104 |
54cfded0 | 360 | |
a4447b93 RH |
361 | const pseudo_typeS cfi_pseudo_table[] = |
362 | { | |
363 | { "cfi_startproc", dot_cfi_startproc, 0 }, | |
364 | { "cfi_endproc", dot_cfi_endproc, 0 }, | |
365 | { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa }, | |
366 | { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register }, | |
367 | { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset }, | |
368 | { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, | |
369 | { "cfi_offset", dot_cfi, DW_CFA_offset }, | |
fa87b337 | 370 | { "cfi_rel_offset", dot_cfi, CFI_rel_offset }, |
a4447b93 | 371 | { "cfi_register", dot_cfi, DW_CFA_register }, |
2be24b54 ML |
372 | { "cfi_return_column", dot_cfi, CFI_return_column }, |
373 | { "cfi_restore", dot_cfi, DW_CFA_restore }, | |
374 | { "cfi_undefined", dot_cfi, DW_CFA_undefined }, | |
375 | { "cfi_same_value", dot_cfi, DW_CFA_same_value }, | |
376 | { "cfi_remember_state", dot_cfi, DW_CFA_remember_state }, | |
377 | { "cfi_restore_state", dot_cfi, DW_CFA_restore_state }, | |
6749011b | 378 | { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save }, |
cdfbf930 | 379 | { "cfi_escape", dot_cfi_escape, 0 }, |
63752a75 | 380 | { "cfi_signal_frame", dot_cfi, CFI_signal_frame }, |
a4447b93 RH |
381 | { NULL, NULL, 0 } |
382 | }; | |
54cfded0 AM |
383 | |
384 | static void | |
a4447b93 | 385 | cfi_parse_separator (void) |
54cfded0 | 386 | { |
a4447b93 RH |
387 | SKIP_WHITESPACE (); |
388 | if (*input_line_pointer == ',') | |
389 | input_line_pointer++; | |
390 | else | |
391 | as_bad (_("missing separator")); | |
54cfded0 AM |
392 | } |
393 | ||
a4447b93 RH |
394 | static unsigned |
395 | cfi_parse_reg (void) | |
54cfded0 | 396 | { |
a4447b93 RH |
397 | int regno; |
398 | expressionS exp; | |
399 | ||
400 | #ifdef tc_regname_to_dw2regnum | |
401 | SKIP_WHITESPACE (); | |
402 | if (is_name_beginner (*input_line_pointer) | |
403 | || (*input_line_pointer == '%' | |
404 | && is_name_beginner (*++input_line_pointer))) | |
405 | { | |
406 | char *name, c; | |
407 | ||
408 | name = input_line_pointer; | |
409 | c = get_symbol_end (); | |
410 | ||
411 | if ((regno = tc_regname_to_dw2regnum (name)) < 0) | |
412 | { | |
413 | as_bad (_("bad register expression")); | |
414 | regno = 0; | |
415 | } | |
54cfded0 | 416 | |
a4447b93 RH |
417 | *input_line_pointer = c; |
418 | return regno; | |
419 | } | |
420 | #endif | |
421 | ||
9497f5ac | 422 | expression_and_evaluate (&exp); |
a4447b93 | 423 | switch (exp.X_op) |
54cfded0 | 424 | { |
a4447b93 RH |
425 | case O_register: |
426 | case O_constant: | |
427 | regno = exp.X_add_number; | |
428 | break; | |
429 | ||
430 | default: | |
431 | as_bad (_("bad register expression")); | |
432 | regno = 0; | |
433 | break; | |
54cfded0 AM |
434 | } |
435 | ||
a4447b93 RH |
436 | return regno; |
437 | } | |
438 | ||
439 | static offsetT | |
440 | cfi_parse_const (void) | |
441 | { | |
442 | return get_absolute_expression (); | |
54cfded0 AM |
443 | } |
444 | ||
445 | static void | |
a4447b93 | 446 | dot_cfi (int arg) |
54cfded0 | 447 | { |
a4447b93 RH |
448 | offsetT offset; |
449 | unsigned reg1, reg2; | |
54cfded0 | 450 | |
a4447b93 | 451 | if (!cur_fde_data) |
54cfded0 AM |
452 | { |
453 | as_bad (_("CFI instruction used without previous .cfi_startproc")); | |
7c9c8381 | 454 | ignore_rest_of_line (); |
54cfded0 AM |
455 | return; |
456 | } | |
457 | ||
a4447b93 RH |
458 | /* If the last address was not at the current PC, advance to current. */ |
459 | if (symbol_get_frag (last_address) != frag_now | |
460 | || S_GET_VALUE (last_address) != frag_now_fix ()) | |
461 | cfi_add_advance_loc (symbol_temp_new_now ()); | |
54cfded0 AM |
462 | |
463 | switch (arg) | |
464 | { | |
a4447b93 | 465 | case DW_CFA_offset: |
a4447b93 RH |
466 | reg1 = cfi_parse_reg (); |
467 | cfi_parse_separator (); | |
468 | offset = cfi_parse_const (); | |
2be24b54 ML |
469 | cfi_add_CFA_offset (reg1, offset); |
470 | break; | |
a4447b93 | 471 | |
fa87b337 RH |
472 | case CFI_rel_offset: |
473 | reg1 = cfi_parse_reg (); | |
474 | cfi_parse_separator (); | |
475 | offset = cfi_parse_const (); | |
476 | cfi_add_CFA_offset (reg1, offset - cur_cfa_offset); | |
477 | break; | |
478 | ||
2be24b54 ML |
479 | case DW_CFA_def_cfa: |
480 | reg1 = cfi_parse_reg (); | |
481 | cfi_parse_separator (); | |
482 | offset = cfi_parse_const (); | |
483 | cfi_add_CFA_def_cfa (reg1, offset); | |
54cfded0 AM |
484 | break; |
485 | ||
a4447b93 RH |
486 | case DW_CFA_register: |
487 | reg1 = cfi_parse_reg (); | |
488 | cfi_parse_separator (); | |
489 | reg2 = cfi_parse_reg (); | |
a4447b93 | 490 | cfi_add_CFA_register (reg1, reg2); |
39b82151 ML |
491 | break; |
492 | ||
a4447b93 RH |
493 | case DW_CFA_def_cfa_register: |
494 | reg1 = cfi_parse_reg (); | |
495 | cfi_add_CFA_def_cfa_register (reg1); | |
54cfded0 AM |
496 | break; |
497 | ||
a4447b93 RH |
498 | case DW_CFA_def_cfa_offset: |
499 | offset = cfi_parse_const (); | |
500 | cfi_add_CFA_def_cfa_offset (offset); | |
54cfded0 AM |
501 | break; |
502 | ||
54cfded0 | 503 | case CFI_adjust_cfa_offset: |
a4447b93 RH |
504 | offset = cfi_parse_const (); |
505 | cfi_add_CFA_def_cfa_offset (cur_cfa_offset + offset); | |
54cfded0 AM |
506 | break; |
507 | ||
2be24b54 | 508 | case DW_CFA_restore: |
b57d375b JB |
509 | for (;;) |
510 | { | |
511 | reg1 = cfi_parse_reg (); | |
512 | cfi_add_CFA_restore (reg1); | |
513 | SKIP_WHITESPACE (); | |
514 | if (*input_line_pointer != ',') | |
515 | break; | |
516 | ++input_line_pointer; | |
517 | } | |
2be24b54 ML |
518 | break; |
519 | ||
520 | case DW_CFA_undefined: | |
b57d375b JB |
521 | for (;;) |
522 | { | |
523 | reg1 = cfi_parse_reg (); | |
524 | cfi_add_CFA_undefined (reg1); | |
525 | SKIP_WHITESPACE (); | |
526 | if (*input_line_pointer != ',') | |
527 | break; | |
528 | ++input_line_pointer; | |
529 | } | |
2be24b54 ML |
530 | break; |
531 | ||
532 | case DW_CFA_same_value: | |
533 | reg1 = cfi_parse_reg (); | |
534 | cfi_add_CFA_same_value (reg1); | |
535 | break; | |
536 | ||
537 | case CFI_return_column: | |
538 | reg1 = cfi_parse_reg (); | |
539 | cfi_set_return_column (reg1); | |
540 | break; | |
541 | ||
542 | case DW_CFA_remember_state: | |
543 | cfi_add_CFA_remember_state (); | |
544 | break; | |
545 | ||
546 | case DW_CFA_restore_state: | |
547 | cfi_add_CFA_restore_state (); | |
548 | break; | |
549 | ||
364b6d8b JJ |
550 | case DW_CFA_GNU_window_save: |
551 | cfi_add_CFA_insn (DW_CFA_GNU_window_save); | |
552 | break; | |
553 | ||
63752a75 JJ |
554 | case CFI_signal_frame: |
555 | cur_fde_data->signal_frame = 1; | |
556 | break; | |
557 | ||
54cfded0 | 558 | default: |
a4447b93 | 559 | abort (); |
54cfded0 | 560 | } |
54cfded0 | 561 | |
a4447b93 | 562 | demand_empty_rest_of_line (); |
54cfded0 AM |
563 | } |
564 | ||
cdfbf930 RH |
565 | static void |
566 | dot_cfi_escape (int ignored ATTRIBUTE_UNUSED) | |
567 | { | |
568 | struct cfi_escape_data *head, **tail, *e; | |
569 | struct cfi_insn_data *insn; | |
570 | ||
571 | if (!cur_fde_data) | |
572 | { | |
573 | as_bad (_("CFI instruction used without previous .cfi_startproc")); | |
7c9c8381 | 574 | ignore_rest_of_line (); |
cdfbf930 RH |
575 | return; |
576 | } | |
577 | ||
578 | /* If the last address was not at the current PC, advance to current. */ | |
579 | if (symbol_get_frag (last_address) != frag_now | |
580 | || S_GET_VALUE (last_address) != frag_now_fix ()) | |
581 | cfi_add_advance_loc (symbol_temp_new_now ()); | |
582 | ||
583 | tail = &head; | |
584 | do | |
585 | { | |
586 | e = xmalloc (sizeof (*e)); | |
587 | do_parse_cons_expression (&e->exp, 1); | |
588 | *tail = e; | |
589 | tail = &e->next; | |
590 | } | |
591 | while (*input_line_pointer++ == ','); | |
592 | *tail = NULL; | |
593 | ||
594 | insn = alloc_cfi_insn_data (); | |
595 | insn->insn = CFI_escape; | |
596 | insn->u.esc = head; | |
7c9c8381 JB |
597 | |
598 | --input_line_pointer; | |
599 | demand_empty_rest_of_line (); | |
cdfbf930 RH |
600 | } |
601 | ||
54cfded0 | 602 | static void |
a4447b93 | 603 | dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED) |
54cfded0 | 604 | { |
a4447b93 | 605 | int simple = 0; |
39b82151 | 606 | |
a4447b93 | 607 | if (cur_fde_data) |
54cfded0 AM |
608 | { |
609 | as_bad (_("previous CFI entry not closed (missing .cfi_endproc)")); | |
7c9c8381 | 610 | ignore_rest_of_line (); |
54cfded0 AM |
611 | return; |
612 | } | |
613 | ||
a4447b93 | 614 | cfi_new_fde (symbol_temp_new_now ()); |
39b82151 | 615 | |
a4447b93 RH |
616 | SKIP_WHITESPACE (); |
617 | if (is_name_beginner (*input_line_pointer)) | |
618 | { | |
619 | char *name, c; | |
54cfded0 | 620 | |
a4447b93 RH |
621 | name = input_line_pointer; |
622 | c = get_symbol_end (); | |
54cfded0 | 623 | |
a4447b93 RH |
624 | if (strcmp (name, "simple") == 0) |
625 | { | |
626 | simple = 1; | |
627 | *input_line_pointer = c; | |
628 | } | |
629 | else | |
630 | input_line_pointer = name; | |
631 | } | |
632 | demand_empty_rest_of_line (); | |
633 | ||
5b9d23c6 | 634 | cur_cfa_offset = 0; |
a4447b93 | 635 | if (!simple) |
39b82151 | 636 | tc_cfi_frame_initial_instructions (); |
54cfded0 AM |
637 | } |
638 | ||
a4447b93 RH |
639 | static void |
640 | dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED) | |
641 | { | |
642 | if (! cur_fde_data) | |
643 | { | |
644 | as_bad (_(".cfi_endproc without corresponding .cfi_startproc")); | |
7c9c8381 | 645 | ignore_rest_of_line (); |
a4447b93 RH |
646 | return; |
647 | } | |
54cfded0 | 648 | |
a4447b93 | 649 | cfi_end_fde (symbol_temp_new_now ()); |
7c9c8381 JB |
650 | |
651 | demand_empty_rest_of_line (); | |
a4447b93 | 652 | } |
39b82151 | 653 | |
a4447b93 RH |
654 | \f |
655 | /* Emit a single byte into the current segment. */ | |
54cfded0 | 656 | |
a4447b93 RH |
657 | static inline void |
658 | out_one (int byte) | |
54cfded0 | 659 | { |
a4447b93 RH |
660 | FRAG_APPEND_1_CHAR (byte); |
661 | } | |
54cfded0 | 662 | |
a4447b93 | 663 | /* Emit a two-byte word into the current segment. */ |
54cfded0 | 664 | |
a4447b93 RH |
665 | static inline void |
666 | out_two (int data) | |
667 | { | |
668 | md_number_to_chars (frag_more (2), data, 2); | |
669 | } | |
54cfded0 | 670 | |
a4447b93 | 671 | /* Emit a four byte word into the current segment. */ |
54cfded0 | 672 | |
a4447b93 RH |
673 | static inline void |
674 | out_four (int data) | |
675 | { | |
676 | md_number_to_chars (frag_more (4), data, 4); | |
677 | } | |
678 | ||
679 | /* Emit an unsigned "little-endian base 128" number. */ | |
54cfded0 | 680 | |
a4447b93 RH |
681 | static void |
682 | out_uleb128 (addressT value) | |
683 | { | |
684 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
54cfded0 AM |
685 | } |
686 | ||
a4447b93 RH |
687 | /* Emit an unsigned "little-endian base 128" number. */ |
688 | ||
689 | static void | |
690 | out_sleb128 (offsetT value) | |
54cfded0 | 691 | { |
a4447b93 RH |
692 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); |
693 | } | |
54cfded0 | 694 | |
a4447b93 RH |
695 | static void |
696 | output_cfi_insn (struct cfi_insn_data *insn) | |
697 | { | |
698 | offsetT offset; | |
699 | unsigned int regno; | |
54cfded0 | 700 | |
a4447b93 | 701 | switch (insn->insn) |
54cfded0 | 702 | { |
a4447b93 RH |
703 | case DW_CFA_advance_loc: |
704 | { | |
705 | symbolS *from = insn->u.ll.lab1; | |
706 | symbolS *to = insn->u.ll.lab2; | |
707 | ||
708 | if (symbol_get_frag (to) == symbol_get_frag (from)) | |
709 | { | |
710 | addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from); | |
711 | addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH; | |
712 | ||
713 | if (scaled <= 0x3F) | |
714 | out_one (DW_CFA_advance_loc + scaled); | |
715 | else if (delta <= 0xFF) | |
716 | { | |
717 | out_one (DW_CFA_advance_loc1); | |
718 | out_one (delta); | |
719 | } | |
720 | else if (delta <= 0xFFFF) | |
721 | { | |
722 | out_one (DW_CFA_advance_loc2); | |
723 | out_two (delta); | |
724 | } | |
725 | else | |
726 | { | |
727 | out_one (DW_CFA_advance_loc4); | |
728 | out_four (delta); | |
729 | } | |
730 | } | |
731 | else | |
732 | { | |
733 | expressionS exp; | |
734 | ||
735 | exp.X_op = O_subtract; | |
736 | exp.X_add_symbol = to; | |
737 | exp.X_op_symbol = from; | |
738 | exp.X_add_number = 0; | |
739 | ||
740 | /* The code in ehopt.c expects that one byte of the encoding | |
741 | is already allocated to the frag. This comes from the way | |
742 | that it scans the .eh_frame section looking first for the | |
743 | .byte DW_CFA_advance_loc4. */ | |
744 | frag_more (1); | |
745 | ||
746 | frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3, | |
747 | make_expr_symbol (&exp), frag_now_fix () - 1, | |
748 | (char *) frag_now); | |
749 | } | |
750 | } | |
751 | break; | |
752 | ||
753 | case DW_CFA_def_cfa: | |
754 | offset = insn->u.ri.offset; | |
755 | if (offset < 0) | |
54cfded0 | 756 | { |
a4447b93 RH |
757 | out_one (DW_CFA_def_cfa_sf); |
758 | out_uleb128 (insn->u.ri.reg); | |
dcb45a06 | 759 | out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
54cfded0 AM |
760 | } |
761 | else | |
762 | { | |
a4447b93 RH |
763 | out_one (DW_CFA_def_cfa); |
764 | out_uleb128 (insn->u.ri.reg); | |
765 | out_uleb128 (offset); | |
54cfded0 AM |
766 | } |
767 | break; | |
768 | ||
a4447b93 | 769 | case DW_CFA_def_cfa_register: |
2be24b54 ML |
770 | case DW_CFA_undefined: |
771 | case DW_CFA_same_value: | |
772 | out_one (insn->insn); | |
773 | out_uleb128 (insn->u.r); | |
54cfded0 AM |
774 | break; |
775 | ||
a4447b93 RH |
776 | case DW_CFA_def_cfa_offset: |
777 | offset = insn->u.i; | |
778 | if (offset < 0) | |
779 | { | |
780 | out_one (DW_CFA_def_cfa_offset_sf); | |
dcb45a06 | 781 | out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
a4447b93 RH |
782 | } |
783 | else | |
784 | { | |
785 | out_one (DW_CFA_def_cfa_offset); | |
786 | out_uleb128 (offset); | |
787 | } | |
54cfded0 AM |
788 | break; |
789 | ||
2be24b54 ML |
790 | case DW_CFA_restore: |
791 | regno = insn->u.r; | |
792 | if (regno <= 0x3F) | |
793 | { | |
794 | out_one (DW_CFA_restore + regno); | |
795 | } | |
796 | else | |
797 | { | |
798 | out_one (DW_CFA_restore_extended); | |
799 | out_uleb128 (regno); | |
800 | } | |
801 | break; | |
802 | ||
a4447b93 RH |
803 | case DW_CFA_offset: |
804 | regno = insn->u.ri.reg; | |
805 | offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; | |
806 | if (offset < 0) | |
807 | { | |
1233ae62 | 808 | out_one (DW_CFA_offset_extended_sf); |
a4447b93 RH |
809 | out_uleb128 (regno); |
810 | out_sleb128 (offset); | |
811 | } | |
812 | else if (regno <= 0x3F) | |
813 | { | |
814 | out_one (DW_CFA_offset + regno); | |
815 | out_uleb128 (offset); | |
816 | } | |
54cfded0 AM |
817 | else |
818 | { | |
a4447b93 RH |
819 | out_one (DW_CFA_offset_extended); |
820 | out_uleb128 (regno); | |
821 | out_uleb128 (offset); | |
54cfded0 | 822 | } |
54cfded0 AM |
823 | break; |
824 | ||
a4447b93 RH |
825 | case DW_CFA_register: |
826 | out_one (DW_CFA_register); | |
827 | out_uleb128 (insn->u.rr.reg1); | |
828 | out_uleb128 (insn->u.rr.reg2); | |
39b82151 ML |
829 | break; |
830 | ||
2be24b54 ML |
831 | case DW_CFA_remember_state: |
832 | case DW_CFA_restore_state: | |
2be24b54 | 833 | out_one (insn->insn); |
54cfded0 AM |
834 | break; |
835 | ||
364b6d8b JJ |
836 | case DW_CFA_GNU_window_save: |
837 | out_one (DW_CFA_GNU_window_save); | |
838 | break; | |
839 | ||
cdfbf930 RH |
840 | case CFI_escape: |
841 | { | |
842 | struct cfi_escape_data *e; | |
843 | for (e = insn->u.esc; e ; e = e->next) | |
844 | emit_expr (&e->exp, 1); | |
845 | break; | |
846 | } | |
847 | ||
54cfded0 | 848 | default: |
a4447b93 | 849 | abort (); |
54cfded0 | 850 | } |
54cfded0 AM |
851 | } |
852 | ||
853 | static void | |
a4447b93 | 854 | output_cie (struct cie_entry *cie) |
54cfded0 | 855 | { |
a4447b93 | 856 | symbolS *after_size_address, *end_address; |
7c0295b1 | 857 | expressionS exp; |
a4447b93 RH |
858 | struct cfi_insn_data *i; |
859 | ||
860 | cie->start_address = symbol_temp_new_now (); | |
861 | after_size_address = symbol_temp_make (); | |
862 | end_address = symbol_temp_make (); | |
863 | ||
864 | exp.X_op = O_subtract; | |
865 | exp.X_add_symbol = end_address; | |
866 | exp.X_op_symbol = after_size_address; | |
867 | exp.X_add_number = 0; | |
868 | ||
289040ca | 869 | emit_expr (&exp, 4); /* Length. */ |
a4447b93 | 870 | symbol_set_value_now (after_size_address); |
289040ca NC |
871 | out_four (0); /* CIE id. */ |
872 | out_one (DW_CIE_VERSION); /* Version. */ | |
873 | out_one ('z'); /* Augmentation. */ | |
a4447b93 | 874 | out_one ('R'); |
63752a75 JJ |
875 | if (cie->signal_frame) |
876 | out_one ('S'); | |
a4447b93 | 877 | out_one (0); |
289040ca NC |
878 | out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */ |
879 | out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */ | |
0da76f83 NC |
880 | if (DW_CIE_VERSION == 1) /* Return column. */ |
881 | out_one (cie->return_column); | |
882 | else | |
883 | out_uleb128 (cie->return_column); | |
289040ca | 884 | out_uleb128 (1); /* Augmentation size. */ |
364b6d8b | 885 | #if defined DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
a4447b93 | 886 | out_one (DW_EH_PE_pcrel | DW_EH_PE_sdata4); |
364b6d8b JJ |
887 | #else |
888 | out_one (DW_EH_PE_sdata4); | |
889 | #endif | |
a4447b93 RH |
890 | |
891 | if (cie->first) | |
892 | for (i = cie->first; i != cie->last; i = i->next) | |
893 | output_cfi_insn (i); | |
894 | ||
4df6ce47 | 895 | frag_align (2, DW_CFA_nop, 0); |
a4447b93 RH |
896 | symbol_set_value_now (end_address); |
897 | } | |
54cfded0 | 898 | |
a4447b93 RH |
899 | static void |
900 | output_fde (struct fde_entry *fde, struct cie_entry *cie, | |
9393cb0d | 901 | struct cfi_insn_data *first, int align) |
a4447b93 RH |
902 | { |
903 | symbolS *after_size_address, *end_address; | |
904 | expressionS exp; | |
54cfded0 | 905 | |
a4447b93 RH |
906 | after_size_address = symbol_temp_make (); |
907 | end_address = symbol_temp_make (); | |
54cfded0 | 908 | |
a4447b93 RH |
909 | exp.X_op = O_subtract; |
910 | exp.X_add_symbol = end_address; | |
911 | exp.X_op_symbol = after_size_address; | |
912 | exp.X_add_number = 0; | |
289040ca | 913 | emit_expr (&exp, 4); /* Length. */ |
a4447b93 | 914 | symbol_set_value_now (after_size_address); |
54cfded0 | 915 | |
a4447b93 RH |
916 | exp.X_add_symbol = after_size_address; |
917 | exp.X_op_symbol = cie->start_address; | |
289040ca | 918 | emit_expr (&exp, 4); /* CIE offset. */ |
364b6d8b JJ |
919 | |
920 | #ifdef DIFF_EXPR_OK | |
a4447b93 RH |
921 | exp.X_add_symbol = fde->start_address; |
922 | exp.X_op_symbol = symbol_temp_new_now (); | |
289040ca | 923 | emit_expr (&exp, 4); /* Code offset. */ |
364b6d8b JJ |
924 | #else |
925 | exp.X_op = O_symbol; | |
926 | exp.X_add_symbol = fde->start_address; | |
927 | exp.X_op_symbol = NULL; | |
928 | #ifdef tc_cfi_emit_pcrel_expr | |
289040ca | 929 | tc_cfi_emit_pcrel_expr (&exp, 4); /* Code offset. */ |
364b6d8b | 930 | #else |
289040ca | 931 | emit_expr (&exp, 4); /* Code offset. */ |
364b6d8b JJ |
932 | #endif |
933 | exp.X_op = O_subtract; | |
934 | #endif | |
54cfded0 | 935 | |
a4447b93 | 936 | exp.X_add_symbol = fde->end_address; |
289040ca | 937 | exp.X_op_symbol = fde->start_address; /* Code length. */ |
a4447b93 | 938 | emit_expr (&exp, 4); |
54cfded0 | 939 | |
289040ca | 940 | out_uleb128 (0); /* Augmentation size. */ |
39b82151 | 941 | |
a4447b93 RH |
942 | for (; first; first = first->next) |
943 | output_cfi_insn (first); | |
39b82151 | 944 | |
4df6ce47 | 945 | frag_align (align, DW_CFA_nop, 0); |
a4447b93 RH |
946 | symbol_set_value_now (end_address); |
947 | } | |
948 | ||
949 | static struct cie_entry * | |
950 | select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst) | |
951 | { | |
952 | struct cfi_insn_data *i, *j; | |
953 | struct cie_entry *cie; | |
954 | ||
955 | for (cie = cie_root; cie; cie = cie->next) | |
39b82151 | 956 | { |
63752a75 JJ |
957 | if (cie->return_column != fde->return_column |
958 | || cie->signal_frame != fde->signal_frame) | |
a4447b93 RH |
959 | continue; |
960 | for (i = cie->first, j = fde->data; | |
961 | i != cie->last && j != NULL; | |
962 | i = i->next, j = j->next) | |
39b82151 | 963 | { |
a4447b93 RH |
964 | if (i->insn != j->insn) |
965 | goto fail; | |
966 | switch (i->insn) | |
967 | { | |
968 | case DW_CFA_advance_loc: | |
289040ca NC |
969 | case DW_CFA_remember_state: |
970 | /* We reached the first advance/remember in the FDE, | |
971 | but did not reach the end of the CIE list. */ | |
a4447b93 RH |
972 | goto fail; |
973 | ||
974 | case DW_CFA_offset: | |
975 | case DW_CFA_def_cfa: | |
976 | if (i->u.ri.reg != j->u.ri.reg) | |
977 | goto fail; | |
978 | if (i->u.ri.offset != j->u.ri.offset) | |
979 | goto fail; | |
980 | break; | |
981 | ||
982 | case DW_CFA_register: | |
983 | if (i->u.rr.reg1 != j->u.rr.reg1) | |
984 | goto fail; | |
985 | if (i->u.rr.reg2 != j->u.rr.reg2) | |
986 | goto fail; | |
987 | break; | |
988 | ||
989 | case DW_CFA_def_cfa_register: | |
2be24b54 ML |
990 | case DW_CFA_restore: |
991 | case DW_CFA_undefined: | |
992 | case DW_CFA_same_value: | |
a4447b93 RH |
993 | if (i->u.r != j->u.r) |
994 | goto fail; | |
995 | break; | |
996 | ||
997 | case DW_CFA_def_cfa_offset: | |
998 | if (i->u.i != j->u.i) | |
999 | goto fail; | |
1000 | break; | |
1001 | ||
cdfbf930 RH |
1002 | case CFI_escape: |
1003 | /* Don't bother matching these for now. */ | |
1004 | goto fail; | |
1005 | ||
a4447b93 RH |
1006 | default: |
1007 | abort (); | |
1008 | } | |
39b82151 | 1009 | } |
a4447b93 RH |
1010 | |
1011 | /* Success if we reached the end of the CIE list, and we've either | |
289040ca NC |
1012 | run out of FDE entries or we've encountered an advance, |
1013 | remember, or escape. */ | |
e9fad691 AM |
1014 | if (i == cie->last |
1015 | && (!j | |
1016 | || j->insn == DW_CFA_advance_loc | |
289040ca | 1017 | || j->insn == DW_CFA_remember_state |
e9fad691 | 1018 | || j->insn == CFI_escape)) |
39b82151 | 1019 | { |
a4447b93 RH |
1020 | *pfirst = j; |
1021 | return cie; | |
39b82151 ML |
1022 | } |
1023 | ||
a4447b93 | 1024 | fail:; |
54cfded0 AM |
1025 | } |
1026 | ||
a4447b93 RH |
1027 | cie = xmalloc (sizeof (struct cie_entry)); |
1028 | cie->next = cie_root; | |
1029 | cie_root = cie; | |
1030 | cie->return_column = fde->return_column; | |
63752a75 | 1031 | cie->signal_frame = fde->signal_frame; |
a4447b93 | 1032 | cie->first = fde->data; |
54cfded0 | 1033 | |
a4447b93 | 1034 | for (i = cie->first; i ; i = i->next) |
e9fad691 | 1035 | if (i->insn == DW_CFA_advance_loc |
289040ca | 1036 | || i->insn == DW_CFA_remember_state |
e9fad691 | 1037 | || i->insn == CFI_escape) |
a4447b93 | 1038 | break; |
54cfded0 | 1039 | |
a4447b93 RH |
1040 | cie->last = i; |
1041 | *pfirst = i; | |
1042 | ||
1043 | output_cie (cie); | |
54cfded0 | 1044 | |
a4447b93 | 1045 | return cie; |
54cfded0 AM |
1046 | } |
1047 | ||
1048 | void | |
a4447b93 | 1049 | cfi_finish (void) |
54cfded0 | 1050 | { |
a4447b93 RH |
1051 | segT cfi_seg; |
1052 | struct fde_entry *fde; | |
eafbc43f | 1053 | int save_flag_traditional_format; |
54cfded0 | 1054 | |
a4447b93 | 1055 | if (cur_fde_data) |
54cfded0 | 1056 | { |
a4447b93 RH |
1057 | as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); |
1058 | cur_fde_data->end_address = cur_fde_data->start_address; | |
54cfded0 | 1059 | } |
54cfded0 | 1060 | |
a4447b93 RH |
1061 | if (all_fde_data == 0) |
1062 | return; | |
54cfded0 | 1063 | |
a4447b93 RH |
1064 | /* Open .eh_frame section. */ |
1065 | cfi_seg = subseg_new (".eh_frame", 0); | |
a4447b93 | 1066 | bfd_set_section_flags (stdoutput, cfi_seg, |
757bc393 | 1067 | SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_READONLY); |
a4447b93 | 1068 | subseg_set (cfi_seg, 0); |
9393cb0d | 1069 | record_alignment (cfi_seg, EH_FRAME_ALIGNMENT); |
54cfded0 | 1070 | |
eafbc43f RH |
1071 | /* Make sure check_eh_frame doesn't do anything with our output. */ |
1072 | save_flag_traditional_format = flag_traditional_format; | |
1073 | flag_traditional_format = 1; | |
1074 | ||
a4447b93 RH |
1075 | for (fde = all_fde_data; fde ; fde = fde->next) |
1076 | { | |
1077 | struct cfi_insn_data *first; | |
1078 | struct cie_entry *cie; | |
1079 | ||
1080 | cie = select_cie_for_fde (fde, &first); | |
6ec51dba | 1081 | output_fde (fde, cie, first, fde->next == NULL ? EH_FRAME_ALIGNMENT : 2); |
a4447b93 | 1082 | } |
eafbc43f RH |
1083 | |
1084 | flag_traditional_format = save_flag_traditional_format; | |
54cfded0 | 1085 | } |