Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
52454417 | 2 | Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
fac0d250 RH |
3 | Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
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 | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
89b66cde | 20 | 02111-1307, USA. */ |
fac0d250 | 21 | |
89b66cde | 22 | /* Logical line numbers can be controlled by the compiler via the |
fac0d250 RH |
23 | following two directives: |
24 | ||
25 | .file FILENO "file.c" | |
26 | .loc FILENO LINENO [COLUMN] | |
27 | ||
28 | FILENO is the filenumber. */ | |
29 | ||
30 | #include "ansidecl.h" | |
fac0d250 | 31 | #include "as.h" |
92eb7b32 | 32 | |
42dbf88c NC |
33 | #ifdef HAVE_LIMITS_H |
34 | #include <limits.h> | |
92625c16 | 35 | #else |
6717891c NC |
36 | #ifdef HAVE_SYS_PARAM_H |
37 | #include <sys/param.h> | |
38 | #endif | |
6256f9dd | 39 | #ifndef INT_MAX |
ee515fb7 | 40 | #define INT_MAX (int) (((unsigned) (-1)) >> 1) |
42dbf88c | 41 | #endif |
b8f080d6 | 42 | #endif |
42dbf88c | 43 | |
92eb7b32 L |
44 | #ifdef BFD_ASSEMBLER |
45 | ||
fac0d250 RH |
46 | #include "dwarf2dbg.h" |
47 | #include "subsegs.h" | |
48 | ||
d9ac5a3b | 49 | #include "elf/dwarf2.h" |
fac0d250 | 50 | |
fac0d250 RH |
51 | /* Since we can't generate the prolog until the body is complete, we |
52 | use three different subsegments for .debug_line: one holding the | |
53 | prolog, one for the directory and filename info, and one for the | |
54 | body ("statement program"). */ | |
55 | #define DL_PROLOG 0 | |
56 | #define DL_FILES 1 | |
57 | #define DL_BODY 2 | |
58 | ||
59 | /* First special line opcde - leave room for the standard opcodes. | |
60 | Note: If you want to change this, you'll have to update the | |
61 | "standard_opcode_lengths" table that is emitted below in | |
62 | dwarf2_finish(). */ | |
63 | #define DWARF2_LINE_OPCODE_BASE 10 | |
64 | ||
65 | #ifndef DWARF2_LINE_BASE | |
66 | /* Minimum line offset in a special line info. opcode. This value | |
67 | was chosen to give a reasonable range of values. */ | |
68 | # define DWARF2_LINE_BASE -5 | |
69 | #endif | |
70 | ||
71 | /* Range of line offsets in a special line info. opcode. */ | |
72 | #ifndef DWARF2_LINE_RANGE | |
73 | # define DWARF2_LINE_RANGE 14 | |
74 | #endif | |
75 | ||
76 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH | |
77 | /* Define the architecture-dependent minimum instruction length (in | |
78 | bytes). This value should be rather too small than too big. */ | |
4dc7ead9 | 79 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
fac0d250 RH |
80 | #endif |
81 | ||
82 | /* Flag that indicates the initial value of the is_stmt_start flag. | |
83 | In the present implementation, we do not mark any lines as | |
84 | the beginning of a source statement, because that information | |
85 | is not made available by the GCC front-end. */ | |
86 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 | |
87 | ||
cb30237e | 88 | /* Given a special op, return the line skip amount. */ |
fac0d250 RH |
89 | #define SPECIAL_LINE(op) \ |
90 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) | |
91 | ||
92 | /* Given a special op, return the address skip amount (in units of | |
93 | DWARF2_LINE_MIN_INSN_LENGTH. */ | |
94 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) | |
95 | ||
cb30237e | 96 | /* The maximum address skip amount that can be encoded with a special op. */ |
fac0d250 RH |
97 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
98 | ||
ee515fb7 | 99 | struct line_entry { |
220e750f RH |
100 | struct line_entry *next; |
101 | fragS *frag; | |
102 | addressT frag_ofs; | |
103 | struct dwarf2_line_info loc; | |
e6c774b4 | 104 | }; |
fac0d250 | 105 | |
ee515fb7 | 106 | struct line_subseg { |
220e750f RH |
107 | struct line_subseg *next; |
108 | subsegT subseg; | |
109 | struct line_entry *head; | |
110 | struct line_entry **ptail; | |
111 | }; | |
353e2c69 | 112 | |
ee515fb7 | 113 | struct line_seg { |
220e750f RH |
114 | struct line_seg *next; |
115 | segT seg; | |
116 | struct line_subseg *head; | |
117 | symbolS *text_start; | |
118 | symbolS *text_end; | |
119 | }; | |
120 | ||
121 | /* Collects data for all line table entries during assembly. */ | |
122 | static struct line_seg *all_segs; | |
123 | ||
ee515fb7 | 124 | struct file_entry { |
220e750f RH |
125 | char *filename; |
126 | unsigned int dir; | |
127 | }; | |
128 | ||
129 | /* Table of files used by .debug_line. */ | |
130 | static struct file_entry *files; | |
131 | static unsigned int files_in_use; | |
132 | static unsigned int files_allocated; | |
133 | ||
134 | /* Correlate file numbers as given by the user in .file/.loc directives | |
135 | with the file numbers used in the output debug info. */ | |
136 | static unsigned int *user_filenum; | |
137 | static unsigned int user_filenum_allocated; | |
138 | ||
139 | /* True when we've seen a .loc directive recently. Used to avoid | |
140 | doing work when there's nothing to do. */ | |
141 | static boolean loc_directive_seen; | |
142 | ||
143 | /* Current location as indicated by the most recent .loc directive. */ | |
144 | static struct dwarf2_line_info current; | |
145 | ||
146 | /* Fake label name. */ | |
147 | static char const fake_label_name[] = ".L0\001"; | |
148 | ||
149 | /* The size of an address on the target. */ | |
150 | static unsigned int sizeof_address; | |
151 | \f | |
152 | static struct line_subseg *get_line_subseg PARAMS ((segT, subsegT)); | |
153 | static unsigned int get_filenum PARAMS ((const char *)); | |
154 | static struct frag *first_frag_for_seg PARAMS ((segT)); | |
155 | static struct frag *last_frag_for_seg PARAMS ((segT)); | |
156 | static void out_byte PARAMS ((int)); | |
157 | static void out_opcode PARAMS ((int)); | |
158 | static void out_two PARAMS ((int)); | |
159 | static void out_four PARAMS ((int)); | |
160 | static void out_abbrev PARAMS ((int, int)); | |
161 | static void out_uleb128 PARAMS ((addressT)); | |
162 | static symbolS *symbol_new_now PARAMS ((void)); | |
163 | static void set_symbol_value_now PARAMS ((symbolS *)); | |
164 | static offsetT get_frag_fix PARAMS ((fragS *)); | |
165 | static void out_set_addr PARAMS ((segT, fragS *, addressT)); | |
166 | static int size_inc_line_addr PARAMS ((int, addressT)); | |
167 | static void emit_inc_line_addr PARAMS ((int, addressT, char *, int)); | |
168 | static void out_inc_line_addr PARAMS ((int, addressT)); | |
169 | static void relax_inc_line_addr PARAMS ((int, segT, fragS *, addressT, | |
170 | fragS *, addressT)); | |
171 | static void process_entries PARAMS ((segT, struct line_entry *)); | |
172 | static void out_file_list PARAMS ((void)); | |
173 | static void out_debug_line PARAMS ((segT)); | |
174 | static void out_debug_aranges PARAMS ((segT, segT)); | |
175 | static void out_debug_abbrev PARAMS ((segT)); | |
176 | static void out_debug_info PARAMS ((segT, segT, segT)); | |
177 | \f | |
178 | /* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ | |
179 | ||
180 | static struct line_subseg * | |
181 | get_line_subseg (seg, subseg) | |
182 | segT seg; | |
183 | subsegT subseg; | |
184 | { | |
185 | static segT last_seg; | |
186 | static subsegT last_subseg; | |
187 | static struct line_subseg *last_line_subseg; | |
188 | ||
189 | struct line_seg *s; | |
190 | struct line_subseg **pss, *ss; | |
fac0d250 | 191 | |
220e750f RH |
192 | if (seg == last_seg && subseg == last_subseg) |
193 | return last_line_subseg; | |
194 | ||
ee515fb7 | 195 | for (s = all_segs; s; s = s->next) |
220e750f RH |
196 | if (s->seg == seg) |
197 | goto found_seg; | |
198 | ||
199 | s = (struct line_seg *) xmalloc (sizeof (*s)); | |
200 | s->next = all_segs; | |
201 | s->seg = seg; | |
202 | s->head = NULL; | |
203 | all_segs = s; | |
204 | ||
205 | found_seg: | |
206 | for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) | |
fac0d250 | 207 | { |
220e750f | 208 | if (ss->subseg == subseg) |
ee515fb7 | 209 | goto found_subseg; |
220e750f RH |
210 | if (ss->subseg > subseg) |
211 | break; | |
fac0d250 | 212 | } |
220e750f RH |
213 | |
214 | ss = (struct line_subseg *) xmalloc (sizeof (*ss)); | |
215 | ss->next = *pss; | |
216 | ss->subseg = subseg; | |
217 | ss->head = NULL; | |
218 | ss->ptail = &ss->head; | |
219 | *pss = ss; | |
220 | ||
221 | found_subseg: | |
222 | last_seg = seg; | |
223 | last_subseg = subseg; | |
224 | last_line_subseg = ss; | |
225 | ||
226 | return ss; | |
fac0d250 RH |
227 | } |
228 | ||
220e750f | 229 | /* Record an entry for LOC ocurring at OFS within the current fragment. */ |
353e2c69 | 230 | |
220e750f RH |
231 | void |
232 | dwarf2_gen_line_info (ofs, loc) | |
233 | addressT ofs; | |
234 | struct dwarf2_line_info *loc; | |
fac0d250 | 235 | { |
220e750f RH |
236 | struct line_subseg *ss; |
237 | struct line_entry *e; | |
238 | ||
239 | /* Early out for as-yet incomplete location information. */ | |
240 | if (loc->filenum == 0 || loc->line == 0) | |
241 | return; | |
242 | ||
243 | e = (struct line_entry *) xmalloc (sizeof (*e)); | |
244 | e->next = NULL; | |
245 | e->frag = frag_now; | |
246 | e->frag_ofs = ofs; | |
247 | e->loc = *loc; | |
248 | ||
249 | ss = get_line_subseg (now_seg, now_subseg); | |
250 | *ss->ptail = e; | |
251 | ss->ptail = &e->next; | |
252 | } | |
fac0d250 | 253 | |
220e750f RH |
254 | void |
255 | dwarf2_where (line) | |
256 | struct dwarf2_line_info *line; | |
257 | { | |
258 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 259 | { |
220e750f RH |
260 | char *filename; |
261 | as_where (&filename, &line->line); | |
262 | line->filenum = get_filenum (filename); | |
263 | line->column = 0; | |
264 | line->flags = DWARF2_FLAG_BEGIN_STMT; | |
fac0d250 | 265 | } |
220e750f RH |
266 | else |
267 | *line = current; | |
fac0d250 RH |
268 | } |
269 | ||
220e750f RH |
270 | /* Called for each machine instruction, or relatively atomic group of |
271 | machine instructions (ie built-in macro). The instruction or group | |
272 | is SIZE bytes in length. If dwarf2 line number generation is called | |
273 | for, emit a line statement appropriately. */ | |
353e2c69 | 274 | |
220e750f RH |
275 | void |
276 | dwarf2_emit_insn (size) | |
277 | int size; | |
fac0d250 | 278 | { |
220e750f | 279 | struct dwarf2_line_info loc; |
fac0d250 | 280 | |
220e750f RH |
281 | if (debug_type != DEBUG_DWARF2 && ! loc_directive_seen) |
282 | return; | |
283 | loc_directive_seen = false; | |
ee515fb7 | 284 | |
220e750f RH |
285 | dwarf2_where (&loc); |
286 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); | |
287 | } | |
fac0d250 | 288 | |
220e750f RH |
289 | /* Get a .debug_line file number for FILENAME. */ |
290 | ||
291 | static unsigned int | |
292 | get_filenum (filename) | |
293 | const char *filename; | |
294 | { | |
295 | static unsigned int last_used; | |
296 | unsigned int i; | |
297 | ||
298 | if (last_used) | |
299 | if (strcmp (filename, files[last_used].filename) == 0) | |
300 | return last_used; | |
301 | ||
302 | for (i = 1; i < files_in_use; ++i) | |
303 | if (strcmp (filename, files[i].filename) == 0) | |
304 | return i; | |
305 | ||
306 | if (i >= files_allocated) | |
fac0d250 | 307 | { |
220e750f RH |
308 | files_allocated = i + 32; |
309 | files = (struct file_entry *) | |
ee515fb7 | 310 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
fac0d250 RH |
311 | } |
312 | ||
ee515fb7 | 313 | files[i].filename = xstrdup (filename); |
220e750f RH |
314 | files[i].dir = 0; |
315 | files_in_use = i + 1; | |
316 | last_used = i; | |
317 | ||
318 | return i; | |
319 | } | |
fac0d250 | 320 | |
220e750f RH |
321 | /* Handle the .file directive. */ |
322 | ||
323 | void | |
324 | dwarf2_directive_file (dummy) | |
325 | int dummy ATTRIBUTE_UNUSED; | |
326 | { | |
327 | offsetT num; | |
328 | const char *filename; | |
329 | int filename_len; | |
330 | ||
331 | /* Continue to accept a bare string and pass it off. */ | |
332 | SKIP_WHITESPACE (); | |
333 | if (*input_line_pointer == '"') | |
fac0d250 | 334 | { |
220e750f | 335 | s_app_file (0); |
fac0d250 RH |
336 | return; |
337 | } | |
338 | ||
220e750f RH |
339 | num = get_absolute_expression (); |
340 | filename = demand_copy_C_string (&filename_len); | |
341 | demand_empty_rest_of_line (); | |
342 | ||
343 | if (num < 0) | |
fac0d250 | 344 | { |
220e750f | 345 | as_bad (_("File number less than zero")); |
fac0d250 RH |
346 | return; |
347 | } | |
348 | ||
bccba5f0 | 349 | if (num >= (int) user_filenum_allocated) |
220e750f RH |
350 | { |
351 | unsigned int old = user_filenum_allocated; | |
352 | ||
353 | user_filenum_allocated = num + 16; | |
354 | user_filenum = (unsigned int *) | |
355 | xrealloc (user_filenum, (num + 16) * sizeof (unsigned int)); | |
fac0d250 | 356 | |
220e750f | 357 | /* Zero the new memory. */ |
ee515fb7 | 358 | memset (user_filenum + old, 0, (num + 16 - old) * sizeof (unsigned int)); |
220e750f RH |
359 | } |
360 | ||
361 | user_filenum[num] = get_filenum (filename); | |
fac0d250 RH |
362 | } |
363 | ||
220e750f RH |
364 | void |
365 | dwarf2_directive_loc (dummy) | |
366 | int dummy ATTRIBUTE_UNUSED; | |
367 | { | |
368 | offsetT filenum, line, column; | |
369 | ||
370 | filenum = get_absolute_expression (); | |
371 | SKIP_WHITESPACE (); | |
372 | line = get_absolute_expression (); | |
373 | SKIP_WHITESPACE (); | |
374 | column = get_absolute_expression (); | |
375 | demand_empty_rest_of_line (); | |
376 | ||
377 | if (filenum < 0) | |
378 | { | |
379 | as_bad (_("File number less than zero")); | |
380 | return; | |
381 | } | |
bccba5f0 | 382 | if (filenum >= (int) user_filenum_allocated |
220e750f RH |
383 | || user_filenum[filenum] == 0) |
384 | { | |
385 | as_bad (_("Unassigned file number %ld"), (long) filenum); | |
386 | return; | |
387 | } | |
388 | ||
389 | current.filenum = user_filenum[filenum]; | |
390 | current.line = line; | |
391 | current.column = column; | |
392 | current.flags = DWARF2_FLAG_BEGIN_STMT; | |
393 | ||
394 | loc_directive_seen = true; | |
395 | ||
396 | #ifndef NO_LISTING | |
397 | if (listing) | |
398 | listing_source_line (line); | |
399 | #endif | |
400 | } | |
220e750f RH |
401 | \f |
402 | static struct frag * | |
403 | first_frag_for_seg (seg) | |
404 | segT seg; | |
405 | { | |
406 | frchainS *f, *first = NULL; | |
407 | ||
ee515fb7 | 408 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
409 | if (f->frch_seg == seg |
410 | && (! first || first->frch_subseg > f->frch_subseg)) | |
411 | first = f; | |
412 | ||
413 | return first ? first->frch_root : NULL; | |
414 | } | |
415 | ||
416 | static struct frag * | |
417 | last_frag_for_seg (seg) | |
418 | segT seg; | |
419 | { | |
420 | frchainS *f, *last = NULL; | |
421 | ||
ee515fb7 | 422 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
423 | if (f->frch_seg == seg |
424 | && (! last || last->frch_subseg < f->frch_subseg)) | |
425 | last= f; | |
426 | ||
427 | return last ? last->frch_last : NULL; | |
428 | } | |
429 | \f | |
430 | /* Emit a single byte into the current segment. */ | |
431 | ||
432 | static inline void | |
433 | out_byte (byte) | |
434 | int byte; | |
435 | { | |
436 | FRAG_APPEND_1_CHAR (byte); | |
437 | } | |
438 | ||
439 | /* Emit a statement program opcode into the current segment. */ | |
440 | ||
441 | static inline void | |
442 | out_opcode (opc) | |
443 | int opc; | |
444 | { | |
445 | out_byte (opc); | |
446 | } | |
447 | ||
448 | /* Emit a two-byte word into the current segment. */ | |
449 | ||
450 | static inline void | |
451 | out_two (data) | |
452 | int data; | |
453 | { | |
454 | md_number_to_chars (frag_more (2), data, 2); | |
455 | } | |
456 | ||
457 | /* Emit a four byte word into the current segment. */ | |
458 | ||
459 | static inline void | |
460 | out_four (data) | |
461 | int data; | |
462 | { | |
463 | md_number_to_chars (frag_more (4), data, 4); | |
464 | } | |
465 | ||
466 | /* Emit an unsigned "little-endian base 128" number. */ | |
467 | ||
fac0d250 | 468 | static void |
220e750f RH |
469 | out_uleb128 (value) |
470 | addressT value; | |
471 | { | |
472 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
473 | } | |
474 | ||
475 | /* Emit a tuple for .debug_abbrev. */ | |
476 | ||
477 | static inline void | |
478 | out_abbrev (name, form) | |
479 | int name, form; | |
fac0d250 | 480 | { |
220e750f RH |
481 | out_uleb128 (name); |
482 | out_uleb128 (form); | |
483 | } | |
fac0d250 | 484 | |
220e750f RH |
485 | /* Create a new fake symbol whose value is the current position. */ |
486 | ||
487 | static symbolS * | |
488 | symbol_new_now () | |
489 | { | |
490 | return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); | |
fac0d250 RH |
491 | } |
492 | ||
220e750f | 493 | /* Set the value of SYM to the current position in the current segment. */ |
353e2c69 | 494 | |
fac0d250 | 495 | static void |
220e750f RH |
496 | set_symbol_value_now (sym) |
497 | symbolS *sym; | |
fac0d250 | 498 | { |
220e750f RH |
499 | S_SET_SEGMENT (sym, now_seg); |
500 | S_SET_VALUE (sym, frag_now_fix ()); | |
501 | symbol_set_frag (sym, frag_now); | |
502 | } | |
503 | ||
504 | /* Get the size of a fragment. */ | |
fac0d250 | 505 | |
220e750f RH |
506 | static offsetT |
507 | get_frag_fix (frag) | |
508 | fragS *frag; | |
509 | { | |
510 | frchainS *fr; | |
511 | ||
512 | if (frag->fr_next) | |
513 | return frag->fr_fix; | |
514 | ||
515 | /* If a fragment is the last in the chain, special measures must be | |
516 | taken to find its size before relaxation, since it may be pending | |
517 | on some subsegment chain. */ | |
ee515fb7 | 518 | for (fr = frchain_root; fr; fr = fr->frch_next) |
220e750f RH |
519 | if (fr->frch_last == frag) |
520 | { | |
521 | return ((char *) obstack_next_free (&fr->frch_obstack) | |
522 | - frag->fr_literal); | |
523 | } | |
524 | ||
525 | abort (); | |
526 | } | |
fac0d250 | 527 | |
220e750f | 528 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 529 | |
220e750f RH |
530 | static void |
531 | out_set_addr (seg, frag, ofs) | |
532 | segT seg; | |
533 | fragS *frag; | |
534 | addressT ofs; | |
535 | { | |
536 | expressionS expr; | |
537 | symbolS *sym; | |
fac0d250 | 538 | |
220e750f | 539 | sym = symbol_new (fake_label_name, seg, ofs, frag); |
9e3af0e7 | 540 | |
fac0d250 | 541 | out_opcode (DW_LNS_extended_op); |
220e750f | 542 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
543 | |
544 | out_opcode (DW_LNE_set_address); | |
545 | expr.X_op = O_symbol; | |
546 | expr.X_add_symbol = sym; | |
547 | expr.X_add_number = 0; | |
220e750f | 548 | emit_expr (&expr, sizeof_address); |
fac0d250 RH |
549 | } |
550 | ||
220e750f RH |
551 | /* Encode a pair of line and address skips as efficiently as possible. |
552 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 553 | |
220e750f RH |
554 | The following two routines *must* be kept in sync. This is |
555 | enforced by making emit_inc_line_addr abort if we do not emit | |
556 | exactly the expected number of bytes. */ | |
557 | ||
558 | static int | |
559 | size_inc_line_addr (line_delta, addr_delta) | |
560 | int line_delta; | |
561 | addressT addr_delta; | |
fac0d250 | 562 | { |
220e750f RH |
563 | unsigned int tmp, opcode; |
564 | int len = 0; | |
fac0d250 | 565 | |
220e750f | 566 | /* Scale the address delta by the minimum instruction length. */ |
ee515fb7 | 567 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
568 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); |
569 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 570 | #endif |
220e750f RH |
571 | |
572 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
573 | We cannot use special opcodes here, since we want the end_sequence | |
574 | to emit the matrix entry. */ | |
575 | if (line_delta == INT_MAX) | |
fac0d250 | 576 | { |
220e750f RH |
577 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
578 | len = 1; | |
fac0d250 | 579 | else |
220e750f RH |
580 | len = 1 + sizeof_leb128 (addr_delta, 0); |
581 | return len + 3; | |
fac0d250 | 582 | } |
fac0d250 | 583 | |
220e750f RH |
584 | /* Bias the line delta by the base. */ |
585 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 586 | |
220e750f RH |
587 | /* If the line increment is out of range of a special opcode, we |
588 | must encode it with DW_LNS_advance_line. */ | |
589 | if (tmp >= DWARF2_LINE_RANGE) | |
590 | { | |
591 | len = 1 + sizeof_leb128 (line_delta, 1); | |
592 | line_delta = 0; | |
593 | tmp = 0 - DWARF2_LINE_BASE; | |
594 | } | |
fac0d250 | 595 | |
220e750f RH |
596 | /* Bias the opcode by the special opcode base. */ |
597 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 598 | |
220e750f RH |
599 | /* Avoid overflow when addr_delta is large. */ |
600 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
601 | { | |
602 | /* Try using a special opcode. */ | |
603 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
604 | if (opcode <= 255) | |
605 | return len + 1; | |
606 | ||
607 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
608 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
609 | if (opcode <= 255) | |
610 | return len + 2; | |
611 | } | |
612 | ||
613 | /* Otherwise use DW_LNS_advance_pc. */ | |
614 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
615 | ||
616 | /* DW_LNS_copy or special opcode. */ | |
617 | len += 1; | |
618 | ||
619 | return len; | |
620 | } | |
fac0d250 | 621 | |
220e750f RH |
622 | static void |
623 | emit_inc_line_addr (line_delta, addr_delta, p, len) | |
624 | int line_delta; | |
625 | addressT addr_delta; | |
626 | char *p; | |
627 | int len; | |
628 | { | |
629 | unsigned int tmp, opcode; | |
630 | int need_copy = 0; | |
631 | char *end = p + len; | |
fac0d250 | 632 | |
ee515fb7 | 633 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
634 | /* Scale the address delta by the minimum instruction length. */ |
635 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); | |
636 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 637 | #endif |
220e750f RH |
638 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
639 | We cannot use special opcodes here, since we want the end_sequence | |
640 | to emit the matrix entry. */ | |
641 | if (line_delta == INT_MAX) | |
fac0d250 | 642 | { |
220e750f RH |
643 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
644 | *p++ = DW_LNS_const_add_pc; | |
645 | else | |
fac0d250 | 646 | { |
220e750f RH |
647 | *p++ = DW_LNS_advance_pc; |
648 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 649 | } |
220e750f RH |
650 | |
651 | *p++ = DW_LNS_extended_op; | |
652 | *p++ = 1; | |
653 | *p++ = DW_LNE_end_sequence; | |
654 | goto done; | |
fac0d250 RH |
655 | } |
656 | ||
220e750f RH |
657 | /* Bias the line delta by the base. */ |
658 | tmp = line_delta - DWARF2_LINE_BASE; | |
659 | ||
660 | /* If the line increment is out of range of a special opcode, we | |
661 | must encode it with DW_LNS_advance_line. */ | |
662 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 663 | { |
220e750f RH |
664 | *p++ = DW_LNS_advance_line; |
665 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 666 | |
220e750f RH |
667 | /* Prettier, I think, to use DW_LNS_copy instead of a |
668 | "line +0, addr +0" special opcode. */ | |
669 | if (addr_delta == 0) | |
670 | { | |
671 | *p++ = DW_LNS_copy; | |
672 | goto done; | |
673 | } | |
cb30237e | 674 | |
220e750f RH |
675 | line_delta = 0; |
676 | tmp = 0 - DWARF2_LINE_BASE; | |
677 | need_copy = 1; | |
678 | } | |
fac0d250 | 679 | |
220e750f RH |
680 | /* Bias the opcode by the special opcode base. */ |
681 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 682 | |
220e750f RH |
683 | /* Avoid overflow when addr_delta is large. */ |
684 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 685 | { |
220e750f RH |
686 | /* Try using a special opcode. */ |
687 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
688 | if (opcode <= 255) | |
689 | { | |
690 | *p++ = opcode; | |
691 | goto done; | |
692 | } | |
693 | ||
694 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
695 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
696 | if (opcode <= 255) | |
fac0d250 | 697 | { |
220e750f RH |
698 | *p++ = DW_LNS_const_add_pc; |
699 | *p++ = opcode; | |
700 | goto done; | |
fac0d250 RH |
701 | } |
702 | } | |
220e750f RH |
703 | |
704 | /* Otherwise use DW_LNS_advance_pc. */ | |
705 | *p++ = DW_LNS_advance_pc; | |
706 | p += output_leb128 (p, addr_delta, 0); | |
707 | ||
708 | if (need_copy) | |
709 | *p++ = DW_LNS_copy; | |
fac0d250 | 710 | else |
220e750f | 711 | *p++ = tmp; |
fac0d250 | 712 | |
220e750f RH |
713 | done: |
714 | assert (p == end); | |
715 | } | |
a8316fe2 | 716 | |
220e750f | 717 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 718 | |
220e750f RH |
719 | static void |
720 | out_inc_line_addr (line_delta, addr_delta) | |
721 | int line_delta; | |
722 | addressT addr_delta; | |
723 | { | |
724 | int len = size_inc_line_addr (line_delta, addr_delta); | |
725 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
726 | } | |
9de8d8f1 | 727 | |
220e750f RH |
728 | /* Generate a variant frag that we can use to relax address/line |
729 | increments between fragments of the target segment. */ | |
9e3af0e7 | 730 | |
220e750f RH |
731 | static void |
732 | relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) | |
733 | int line_delta; | |
734 | segT seg; | |
735 | fragS *to_frag, *from_frag; | |
736 | addressT to_ofs, from_ofs; | |
737 | { | |
738 | symbolS *to_sym, *from_sym; | |
739 | expressionS expr; | |
740 | int max_chars; | |
6576f0b5 | 741 | |
220e750f RH |
742 | to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); |
743 | from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); | |
fac0d250 | 744 | |
220e750f RH |
745 | expr.X_op = O_subtract; |
746 | expr.X_add_symbol = to_sym; | |
747 | expr.X_op_symbol = from_sym; | |
748 | expr.X_add_number = 0; | |
fac0d250 | 749 | |
220e750f RH |
750 | /* The maximum size of the frag is the line delta with a maximum |
751 | sized address delta. */ | |
752 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 753 | |
220e750f RH |
754 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
755 | make_expr_symbol (&expr), line_delta, NULL); | |
756 | } | |
fac0d250 | 757 | |
220e750f RH |
758 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
759 | based on the current values of the symbols. It is called before | |
760 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 761 | |
220e750f RH |
762 | int |
763 | dwarf2dbg_estimate_size_before_relax (frag) | |
764 | fragS *frag; | |
765 | { | |
766 | offsetT addr_delta; | |
767 | int size; | |
fac0d250 | 768 | |
220e750f RH |
769 | addr_delta = resolve_symbol_value (frag->fr_symbol, 0); |
770 | size = size_inc_line_addr (frag->fr_offset, addr_delta); | |
fac0d250 | 771 | |
220e750f | 772 | frag->fr_subtype = size; |
fac0d250 | 773 | |
220e750f RH |
774 | return size; |
775 | } | |
776 | ||
777 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
778 | current values of the symbols. fr_subtype is the current length | |
779 | of the frag. This returns the change in frag length. */ | |
780 | ||
781 | int | |
782 | dwarf2dbg_relax_frag (frag) | |
783 | fragS *frag; | |
784 | { | |
785 | int old_size, new_size; | |
fac0d250 | 786 | |
220e750f RH |
787 | old_size = frag->fr_subtype; |
788 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 789 | |
220e750f | 790 | return new_size - old_size; |
fac0d250 RH |
791 | } |
792 | ||
220e750f RH |
793 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
794 | fill frag. This is called after all relaxation has been done. | |
795 | fr_subtype will be the desired length of the frag. */ | |
796 | ||
797 | void | |
798 | dwarf2dbg_convert_frag (frag) | |
799 | fragS *frag; | |
fac0d250 | 800 | { |
220e750f RH |
801 | offsetT addr_diff; |
802 | ||
803 | addr_diff = resolve_symbol_value (frag->fr_symbol, 1); | |
fac0d250 | 804 | |
220e750f RH |
805 | /* fr_var carries the max_chars that we created the fragment with. |
806 | fr_subtype carries the current expected length. We must, of | |
807 | course, have allocated enough memory earlier. */ | |
bccba5f0 | 808 | assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 809 | |
ee515fb7 | 810 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
220e750f RH |
811 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
812 | ||
813 | frag->fr_fix += frag->fr_subtype; | |
814 | frag->fr_type = rs_fill; | |
815 | frag->fr_var = 0; | |
816 | frag->fr_offset = 0; | |
817 | } | |
818 | ||
819 | /* Generate .debug_line content for the chain of line number entries | |
820 | beginning at E, for segment SEG. */ | |
821 | ||
822 | static void | |
823 | process_entries (seg, e) | |
824 | segT seg; | |
825 | struct line_entry *e; | |
826 | { | |
827 | unsigned filenum = 1; | |
828 | unsigned line = 1; | |
829 | unsigned column = 0; | |
830 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; | |
831 | fragS *frag = NULL; | |
832 | fragS *last_frag; | |
833 | addressT frag_ofs = 0; | |
834 | addressT last_frag_ofs; | |
835 | struct line_entry *next; | |
836 | ||
837 | while (e) | |
fac0d250 | 838 | { |
220e750f RH |
839 | int changed = 0; |
840 | ||
841 | if (filenum != e->loc.filenum) | |
fac0d250 | 842 | { |
220e750f RH |
843 | filenum = e->loc.filenum; |
844 | out_opcode (DW_LNS_set_file); | |
845 | out_uleb128 (filenum); | |
846 | changed = 1; | |
847 | } | |
848 | ||
849 | if (column != e->loc.column) | |
850 | { | |
851 | column = e->loc.column; | |
852 | out_opcode (DW_LNS_set_column); | |
853 | out_uleb128 (column); | |
854 | changed = 1; | |
855 | } | |
856 | ||
857 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) | |
858 | { | |
859 | flags = e->loc.flags; | |
860 | out_opcode (DW_LNS_negate_stmt); | |
861 | changed = 1; | |
862 | } | |
863 | ||
864 | if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) | |
865 | { | |
866 | out_opcode (DW_LNS_set_basic_block); | |
867 | changed = 1; | |
868 | } | |
869 | ||
870 | if (line != e->loc.line || changed) | |
871 | { | |
872 | int line_delta = e->loc.line - line; | |
873 | if (frag == NULL) | |
fac0d250 | 874 | { |
220e750f RH |
875 | out_set_addr (seg, e->frag, e->frag_ofs); |
876 | out_inc_line_addr (line_delta, 0); | |
fac0d250 | 877 | } |
220e750f RH |
878 | else if (frag == e->frag) |
879 | out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); | |
880 | else | |
881 | relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, | |
882 | frag, frag_ofs); | |
883 | ||
884 | frag = e->frag; | |
885 | frag_ofs = e->frag_ofs; | |
886 | line = e->loc.line; | |
fac0d250 | 887 | } |
220e750f RH |
888 | else if (frag == NULL) |
889 | { | |
890 | out_set_addr (seg, e->frag, e->frag_ofs); | |
891 | frag = e->frag; | |
892 | frag_ofs = e->frag_ofs; | |
893 | } | |
894 | ||
895 | next = e->next; | |
896 | free (e); | |
897 | e = next; | |
fac0d250 | 898 | } |
353e2c69 | 899 | |
220e750f RH |
900 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
901 | last_frag = last_frag_for_seg (seg); | |
902 | last_frag_ofs = get_frag_fix (last_frag); | |
903 | if (frag == last_frag) | |
904 | out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); | |
905 | else | |
ee515fb7 | 906 | relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, |
220e750f | 907 | frag, frag_ofs); |
fac0d250 RH |
908 | } |
909 | ||
220e750f RH |
910 | /* Emit the directory and file tables for .debug_line. */ |
911 | ||
fac0d250 | 912 | static void |
220e750f | 913 | out_file_list () |
fac0d250 RH |
914 | { |
915 | size_t size; | |
916 | char *cp; | |
220e750f RH |
917 | unsigned int i; |
918 | ||
919 | /* Terminate directory list. */ | |
920 | out_byte ('\0'); | |
fac0d250 | 921 | |
220e750f | 922 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 923 | { |
220e750f | 924 | size = strlen (files[i].filename) + 1; |
fac0d250 | 925 | cp = frag_more (size); |
220e750f | 926 | memcpy (cp, files[i].filename, size); |
fac0d250 | 927 | |
220e750f | 928 | out_uleb128 (files[i].dir); /* directory number */ |
fac0d250 RH |
929 | out_uleb128 (0); /* last modification timestamp */ |
930 | out_uleb128 (0); /* filesize */ | |
931 | } | |
353e2c69 KH |
932 | |
933 | /* Terminate filename list. */ | |
934 | out_byte (0); | |
fac0d250 RH |
935 | } |
936 | ||
220e750f RH |
937 | /* Emit the collected .debug_line data. */ |
938 | ||
939 | static void | |
940 | out_debug_line (line_seg) | |
941 | segT line_seg; | |
942 | { | |
943 | expressionS expr; | |
944 | symbolS *line_start; | |
945 | symbolS *prologue_end; | |
946 | symbolS *line_end; | |
947 | struct line_seg *s; | |
948 | ||
949 | subseg_set (line_seg, 0); | |
950 | ||
951 | line_start = symbol_new_now (); | |
952 | prologue_end = symbol_make (fake_label_name); | |
953 | line_end = symbol_make (fake_label_name); | |
954 | ||
955 | /* Total length of the information for this compilation unit. */ | |
956 | expr.X_op = O_subtract; | |
957 | expr.X_add_symbol = line_end; | |
958 | expr.X_op_symbol = line_start; | |
959 | expr.X_add_number = -4; | |
960 | emit_expr (&expr, 4); | |
961 | ||
962 | /* Version. */ | |
963 | out_two (2); | |
964 | ||
965 | /* Length of the prologue following this length. */ | |
966 | expr.X_op = O_subtract; | |
967 | expr.X_add_symbol = prologue_end; | |
968 | expr.X_op_symbol = line_start; | |
969 | expr.X_add_number = - (4 + 2 + 4); | |
970 | emit_expr (&expr, 4); | |
971 | ||
972 | /* Parameters of the state machine. */ | |
973 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
974 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
975 | out_byte (DWARF2_LINE_BASE); | |
976 | out_byte (DWARF2_LINE_RANGE); | |
977 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
978 | ||
979 | /* Standard opcode lengths. */ | |
980 | out_byte (0); /* DW_LNS_copy */ | |
981 | out_byte (1); /* DW_LNS_advance_pc */ | |
982 | out_byte (1); /* DW_LNS_advance_line */ | |
983 | out_byte (1); /* DW_LNS_set_file */ | |
984 | out_byte (1); /* DW_LNS_set_column */ | |
985 | out_byte (0); /* DW_LNS_negate_stmt */ | |
986 | out_byte (0); /* DW_LNS_set_basic_block */ | |
987 | out_byte (0); /* DW_LNS_const_add_pc */ | |
988 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
989 | ||
990 | out_file_list (); | |
991 | ||
992 | set_symbol_value_now (prologue_end); | |
993 | ||
994 | /* For each section, emit a statement program. */ | |
ee515fb7 | 995 | for (s = all_segs; s; s = s->next) |
220e750f RH |
996 | process_entries (s->seg, s->head->head); |
997 | ||
998 | set_symbol_value_now (line_end); | |
999 | } | |
1000 | ||
1001 | /* Emit data for .debug_aranges. */ | |
1002 | ||
58b5739a | 1003 | static void |
220e750f RH |
1004 | out_debug_aranges (aranges_seg, info_seg) |
1005 | segT aranges_seg; | |
1006 | segT info_seg; | |
fac0d250 | 1007 | { |
220e750f RH |
1008 | unsigned int addr_size = sizeof_address; |
1009 | addressT size, skip; | |
1010 | struct line_seg *s; | |
1011 | expressionS expr; | |
1012 | char *p; | |
fac0d250 | 1013 | |
220e750f | 1014 | size = 4 + 2 + 4 + 1 + 1; |
fac0d250 | 1015 | |
ee515fb7 KH |
1016 | skip = 2 * addr_size - (size & (2 * addr_size - 1)); |
1017 | if (skip == 2 * addr_size) | |
220e750f RH |
1018 | skip = 0; |
1019 | size += skip; | |
fac0d250 | 1020 | |
ee515fb7 KH |
1021 | for (s = all_segs; s; s = s->next) |
1022 | size += 2 * addr_size; | |
fac0d250 | 1023 | |
ee515fb7 | 1024 | size += 2 * addr_size; |
fac0d250 | 1025 | |
220e750f | 1026 | subseg_set (aranges_seg, 0); |
fac0d250 | 1027 | |
220e750f RH |
1028 | /* Length of the compilation unit. */ |
1029 | out_four (size - 4); | |
fac0d250 | 1030 | |
220e750f RH |
1031 | /* Version. */ |
1032 | out_two (2); | |
4dc7ead9 | 1033 | |
220e750f RH |
1034 | /* Offset to .debug_info. */ |
1035 | expr.X_op = O_symbol; | |
1036 | expr.X_add_symbol = section_symbol (info_seg); | |
1037 | expr.X_add_number = 0; | |
1038 | emit_expr (&expr, 4); | |
1039 | ||
1040 | /* Size of an address (offset portion). */ | |
1041 | out_byte (addr_size); | |
1042 | ||
1043 | /* Size of a segment descriptor. */ | |
1044 | out_byte (0); | |
1045 | ||
1046 | /* Align the header. */ | |
1047 | if (skip) | |
ee515fb7 | 1048 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
4dc7ead9 | 1049 | |
ee515fb7 | 1050 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1051 | { |
1052 | fragS *frag; | |
1053 | symbolS *beg, *end; | |
1054 | ||
1055 | frag = first_frag_for_seg (s->seg); | |
1056 | beg = symbol_new (fake_label_name, s->seg, 0, frag); | |
1057 | s->text_start = beg; | |
1058 | ||
1059 | frag = last_frag_for_seg (s->seg); | |
1060 | end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); | |
1061 | s->text_end = end; | |
1062 | ||
1063 | expr.X_op = O_symbol; | |
1064 | expr.X_add_symbol = beg; | |
1065 | expr.X_add_number = 0; | |
1066 | emit_expr (&expr, addr_size); | |
1067 | ||
1068 | expr.X_op = O_subtract; | |
1069 | expr.X_add_symbol = end; | |
1070 | expr.X_op_symbol = beg; | |
1071 | expr.X_add_number = 0; | |
1072 | emit_expr (&expr, addr_size); | |
1073 | } | |
4dc7ead9 | 1074 | |
220e750f RH |
1075 | p = frag_more (2 * addr_size); |
1076 | md_number_to_chars (p, 0, addr_size); | |
1077 | md_number_to_chars (p + addr_size, 0, addr_size); | |
4dc7ead9 RH |
1078 | } |
1079 | ||
220e750f RH |
1080 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1081 | sync with out_debug_info below. */ | |
fac0d250 | 1082 | |
220e750f RH |
1083 | static void |
1084 | out_debug_abbrev (abbrev_seg) | |
1085 | segT abbrev_seg; | |
1086 | { | |
1087 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1088 | |
220e750f RH |
1089 | out_uleb128 (1); |
1090 | out_uleb128 (DW_TAG_compile_unit); | |
1091 | out_byte (DW_CHILDREN_no); | |
1092 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1093 | if (all_segs->next == NULL) | |
4dc7ead9 | 1094 | { |
220e750f RH |
1095 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
1096 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1097 | } | |
1098 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); | |
1099 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1100 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1101 | out_abbrev (0, 0); | |
a987bfc9 RH |
1102 | |
1103 | /* Terminate the abbreviations for this compilation unit. */ | |
1104 | out_byte (0); | |
220e750f | 1105 | } |
4dc7ead9 | 1106 | |
220e750f | 1107 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1108 | |
220e750f RH |
1109 | static void |
1110 | out_debug_info (info_seg, abbrev_seg, line_seg) | |
1111 | segT info_seg; | |
1112 | segT abbrev_seg; | |
1113 | segT line_seg; | |
1114 | { | |
1115 | char producer[128]; | |
1116 | char *comp_dir; | |
1117 | expressionS expr; | |
1118 | symbolS *info_start; | |
1119 | symbolS *info_end; | |
1120 | char *p; | |
1121 | int len; | |
4dc7ead9 | 1122 | |
220e750f | 1123 | subseg_set (info_seg, 0); |
4dc7ead9 | 1124 | |
ee515fb7 | 1125 | info_start = symbol_new_now (); |
220e750f | 1126 | info_end = symbol_make (fake_label_name); |
4dc7ead9 | 1127 | |
220e750f RH |
1128 | /* Compilation Unit length. */ |
1129 | expr.X_op = O_subtract; | |
1130 | expr.X_add_symbol = info_end; | |
1131 | expr.X_op_symbol = info_start; | |
1132 | expr.X_add_number = -4; | |
1133 | emit_expr (&expr, 4); | |
4dc7ead9 | 1134 | |
220e750f RH |
1135 | /* DWARF version. */ |
1136 | out_two (2); | |
4dc7ead9 | 1137 | |
220e750f RH |
1138 | /* .debug_abbrev offset */ |
1139 | expr.X_op = O_symbol; | |
1140 | expr.X_add_symbol = section_symbol (abbrev_seg); | |
1141 | expr.X_add_number = 0; | |
1142 | emit_expr (&expr, 4); | |
4dc7ead9 | 1143 | |
220e750f RH |
1144 | /* Target address size. */ |
1145 | out_byte (sizeof_address); | |
fac0d250 | 1146 | |
220e750f RH |
1147 | /* DW_TAG_compile_unit DIE abbrev */ |
1148 | out_uleb128 (1); | |
fac0d250 | 1149 | |
220e750f RH |
1150 | /* DW_AT_stmt_list */ |
1151 | expr.X_op = O_symbol; | |
1152 | expr.X_add_symbol = section_symbol (line_seg); | |
1153 | expr.X_add_number = 0; | |
1154 | emit_expr (&expr, 4); | |
fac0d250 | 1155 | |
220e750f RH |
1156 | /* These two attributes may only be emitted if all of the code is |
1157 | contiguous. Multiple sections are not that. */ | |
1158 | if (all_segs->next == NULL) | |
58b5739a | 1159 | { |
220e750f RH |
1160 | /* DW_AT_low_pc */ |
1161 | expr.X_op = O_symbol; | |
1162 | expr.X_add_symbol = all_segs->text_start; | |
1163 | expr.X_add_number = 0; | |
1164 | emit_expr (&expr, sizeof_address); | |
1165 | ||
1166 | /* DW_AT_high_pc */ | |
1167 | expr.X_op = O_symbol; | |
1168 | expr.X_add_symbol = all_segs->text_end; | |
1169 | expr.X_add_number = 0; | |
1170 | emit_expr (&expr, sizeof_address); | |
58b5739a RH |
1171 | } |
1172 | ||
220e750f RH |
1173 | /* DW_AT_comp_dir */ |
1174 | comp_dir = getpwd (); | |
1175 | len = strlen (comp_dir) + 1; | |
1176 | p = frag_more (len); | |
1177 | memcpy (p, comp_dir, len); | |
fac0d250 | 1178 | |
220e750f RH |
1179 | /* DW_AT_producer */ |
1180 | sprintf (producer, "GNU AS %s", VERSION); | |
1181 | len = strlen (producer) + 1; | |
1182 | p = frag_more (len); | |
1183 | memcpy (p, producer, len); | |
fac0d250 | 1184 | |
220e750f RH |
1185 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1186 | dwarf2 draft has no standard code for assembler. */ | |
1187 | out_two (DW_LANG_Mips_Assembler); | |
1188 | ||
1189 | set_symbol_value_now (info_end); | |
fac0d250 RH |
1190 | } |
1191 | ||
1192 | void | |
220e750f | 1193 | dwarf2_finish () |
fac0d250 | 1194 | { |
220e750f RH |
1195 | segT line_seg; |
1196 | struct line_seg *s; | |
fac0d250 | 1197 | |
220e750f RH |
1198 | /* If no debug information was recorded, nothing to do. */ |
1199 | if (all_segs == NULL) | |
1200 | return; | |
fac0d250 | 1201 | |
220e750f | 1202 | /* Calculate the size of an address for the target machine. */ |
220e750f | 1203 | sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8; |
fac0d250 | 1204 | |
220e750f RH |
1205 | /* Create and switch to the line number section. */ |
1206 | line_seg = subseg_new (".debug_line", 0); | |
220e750f | 1207 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); |
fac0d250 | 1208 | |
220e750f | 1209 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1210 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1211 | { |
220e750f RH |
1212 | struct line_subseg *ss = s->head; |
1213 | struct line_entry **ptail = ss->ptail; | |
1214 | ||
1215 | while ((ss = ss->next) != NULL) | |
1216 | { | |
1217 | *ptail = ss->head; | |
1218 | ptail = ss->ptail; | |
1219 | } | |
fac0d250 | 1220 | } |
85a39694 | 1221 | |
220e750f | 1222 | out_debug_line (line_seg); |
85a39694 | 1223 | |
220e750f RH |
1224 | /* If this is assembler generated line info, we need .debug_info |
1225 | and .debug_abbrev sections as well. */ | |
1226 | if (debug_type == DEBUG_DWARF2) | |
1227 | { | |
1228 | segT abbrev_seg; | |
1229 | segT info_seg; | |
1230 | segT aranges_seg; | |
4dc7ead9 | 1231 | |
220e750f RH |
1232 | info_seg = subseg_new (".debug_info", 0); |
1233 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1234 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1235 | |
220e750f RH |
1236 | bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); |
1237 | bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); | |
1238 | bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); | |
ef99799a | 1239 | |
ee515fb7 | 1240 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1241 | |
220e750f RH |
1242 | out_debug_aranges (aranges_seg, info_seg); |
1243 | out_debug_abbrev (abbrev_seg); | |
1244 | out_debug_info (info_seg, abbrev_seg, line_seg); | |
1245 | } | |
85a39694 | 1246 | } |
92eb7b32 L |
1247 | |
1248 | #else | |
1249 | void | |
1250 | dwarf2_finish () | |
1251 | { | |
1252 | } | |
1253 | ||
1254 | int | |
1255 | dwarf2dbg_estimate_size_before_relax (frag) | |
1256 | fragS *frag ATTRIBUTE_UNUSED; | |
1257 | { | |
1258 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | int | |
1263 | dwarf2dbg_relax_frag (frag) | |
1264 | fragS *frag ATTRIBUTE_UNUSED; | |
1265 | { | |
1266 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | void | |
1271 | dwarf2dbg_convert_frag (frag) | |
1272 | fragS *frag ATTRIBUTE_UNUSED; | |
1273 | { | |
1274 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1275 | } | |
1276 | ||
1277 | void | |
1278 | dwarf2_emit_insn (size) | |
1279 | int size ATTRIBUTE_UNUSED; | |
1280 | { | |
1281 | } | |
1282 | ||
1283 | void | |
1284 | dwarf2_directive_file (dummy) | |
1285 | int dummy ATTRIBUTE_UNUSED; | |
1286 | { | |
1287 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1288 | } | |
1289 | ||
1290 | void | |
1291 | dwarf2_directive_loc (dummy) | |
1292 | int dummy ATTRIBUTE_UNUSED; | |
1293 | { | |
1294 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1295 | } | |
1296 | #endif /* BFD_ASSEMBLER */ |