Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
f7e42eb4 | 2 | Copyright 1999, 2000, 2001 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 | ||
220e750f RH |
134 | /* True when we've seen a .loc directive recently. Used to avoid |
135 | doing work when there's nothing to do. */ | |
136 | static boolean loc_directive_seen; | |
137 | ||
138 | /* Current location as indicated by the most recent .loc directive. */ | |
139 | static struct dwarf2_line_info current; | |
140 | ||
141 | /* Fake label name. */ | |
142 | static char const fake_label_name[] = ".L0\001"; | |
143 | ||
144 | /* The size of an address on the target. */ | |
145 | static unsigned int sizeof_address; | |
146 | \f | |
147 | static struct line_subseg *get_line_subseg PARAMS ((segT, subsegT)); | |
148 | static unsigned int get_filenum PARAMS ((const char *)); | |
149 | static struct frag *first_frag_for_seg PARAMS ((segT)); | |
150 | static struct frag *last_frag_for_seg PARAMS ((segT)); | |
151 | static void out_byte PARAMS ((int)); | |
152 | static void out_opcode PARAMS ((int)); | |
153 | static void out_two PARAMS ((int)); | |
154 | static void out_four PARAMS ((int)); | |
155 | static void out_abbrev PARAMS ((int, int)); | |
156 | static void out_uleb128 PARAMS ((addressT)); | |
157 | static symbolS *symbol_new_now PARAMS ((void)); | |
158 | static void set_symbol_value_now PARAMS ((symbolS *)); | |
159 | static offsetT get_frag_fix PARAMS ((fragS *)); | |
160 | static void out_set_addr PARAMS ((segT, fragS *, addressT)); | |
161 | static int size_inc_line_addr PARAMS ((int, addressT)); | |
162 | static void emit_inc_line_addr PARAMS ((int, addressT, char *, int)); | |
163 | static void out_inc_line_addr PARAMS ((int, addressT)); | |
164 | static void relax_inc_line_addr PARAMS ((int, segT, fragS *, addressT, | |
165 | fragS *, addressT)); | |
166 | static void process_entries PARAMS ((segT, struct line_entry *)); | |
167 | static void out_file_list PARAMS ((void)); | |
168 | static void out_debug_line PARAMS ((segT)); | |
169 | static void out_debug_aranges PARAMS ((segT, segT)); | |
170 | static void out_debug_abbrev PARAMS ((segT)); | |
171 | static void out_debug_info PARAMS ((segT, segT, segT)); | |
172 | \f | |
173 | /* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ | |
174 | ||
175 | static struct line_subseg * | |
176 | get_line_subseg (seg, subseg) | |
177 | segT seg; | |
178 | subsegT subseg; | |
179 | { | |
180 | static segT last_seg; | |
181 | static subsegT last_subseg; | |
182 | static struct line_subseg *last_line_subseg; | |
183 | ||
184 | struct line_seg *s; | |
185 | struct line_subseg **pss, *ss; | |
fac0d250 | 186 | |
220e750f RH |
187 | if (seg == last_seg && subseg == last_subseg) |
188 | return last_line_subseg; | |
189 | ||
ee515fb7 | 190 | for (s = all_segs; s; s = s->next) |
220e750f RH |
191 | if (s->seg == seg) |
192 | goto found_seg; | |
193 | ||
194 | s = (struct line_seg *) xmalloc (sizeof (*s)); | |
195 | s->next = all_segs; | |
196 | s->seg = seg; | |
197 | s->head = NULL; | |
198 | all_segs = s; | |
199 | ||
200 | found_seg: | |
201 | for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) | |
fac0d250 | 202 | { |
220e750f | 203 | if (ss->subseg == subseg) |
ee515fb7 | 204 | goto found_subseg; |
220e750f RH |
205 | if (ss->subseg > subseg) |
206 | break; | |
fac0d250 | 207 | } |
220e750f RH |
208 | |
209 | ss = (struct line_subseg *) xmalloc (sizeof (*ss)); | |
210 | ss->next = *pss; | |
211 | ss->subseg = subseg; | |
212 | ss->head = NULL; | |
213 | ss->ptail = &ss->head; | |
214 | *pss = ss; | |
215 | ||
216 | found_subseg: | |
217 | last_seg = seg; | |
218 | last_subseg = subseg; | |
219 | last_line_subseg = ss; | |
220 | ||
221 | return ss; | |
fac0d250 RH |
222 | } |
223 | ||
220e750f | 224 | /* Record an entry for LOC ocurring at OFS within the current fragment. */ |
353e2c69 | 225 | |
220e750f RH |
226 | void |
227 | dwarf2_gen_line_info (ofs, loc) | |
228 | addressT ofs; | |
229 | struct dwarf2_line_info *loc; | |
fac0d250 | 230 | { |
220e750f RH |
231 | struct line_subseg *ss; |
232 | struct line_entry *e; | |
1ea5c325 MS |
233 | static unsigned int line = -1; |
234 | static unsigned int filenum = -1; | |
220e750f RH |
235 | |
236 | /* Early out for as-yet incomplete location information. */ | |
237 | if (loc->filenum == 0 || loc->line == 0) | |
238 | return; | |
239 | ||
1ea5c325 MS |
240 | /* Don't emit sequences of line symbols for the same line. */ |
241 | if (line == loc->line && filenum == loc->filenum) | |
242 | return; | |
243 | ||
244 | line = loc->line; | |
245 | filenum = loc->filenum; | |
246 | ||
220e750f RH |
247 | e = (struct line_entry *) xmalloc (sizeof (*e)); |
248 | e->next = NULL; | |
249 | e->frag = frag_now; | |
250 | e->frag_ofs = ofs; | |
251 | e->loc = *loc; | |
252 | ||
253 | ss = get_line_subseg (now_seg, now_subseg); | |
254 | *ss->ptail = e; | |
255 | ss->ptail = &e->next; | |
256 | } | |
fac0d250 | 257 | |
220e750f RH |
258 | void |
259 | dwarf2_where (line) | |
260 | struct dwarf2_line_info *line; | |
261 | { | |
262 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 263 | { |
220e750f RH |
264 | char *filename; |
265 | as_where (&filename, &line->line); | |
266 | line->filenum = get_filenum (filename); | |
267 | line->column = 0; | |
268 | line->flags = DWARF2_FLAG_BEGIN_STMT; | |
fac0d250 | 269 | } |
220e750f RH |
270 | else |
271 | *line = current; | |
fac0d250 RH |
272 | } |
273 | ||
220e750f RH |
274 | /* Called for each machine instruction, or relatively atomic group of |
275 | machine instructions (ie built-in macro). The instruction or group | |
276 | is SIZE bytes in length. If dwarf2 line number generation is called | |
277 | for, emit a line statement appropriately. */ | |
353e2c69 | 278 | |
220e750f RH |
279 | void |
280 | dwarf2_emit_insn (size) | |
281 | int size; | |
fac0d250 | 282 | { |
220e750f | 283 | struct dwarf2_line_info loc; |
fac0d250 | 284 | |
220e750f RH |
285 | if (debug_type != DEBUG_DWARF2 && ! loc_directive_seen) |
286 | return; | |
287 | loc_directive_seen = false; | |
ee515fb7 | 288 | |
220e750f RH |
289 | dwarf2_where (&loc); |
290 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); | |
291 | } | |
fac0d250 | 292 | |
220e750f RH |
293 | /* Get a .debug_line file number for FILENAME. */ |
294 | ||
295 | static unsigned int | |
296 | get_filenum (filename) | |
297 | const char *filename; | |
298 | { | |
299 | static unsigned int last_used; | |
300 | unsigned int i; | |
301 | ||
302 | if (last_used) | |
303 | if (strcmp (filename, files[last_used].filename) == 0) | |
304 | return last_used; | |
305 | ||
306 | for (i = 1; i < files_in_use; ++i) | |
307 | if (strcmp (filename, files[i].filename) == 0) | |
308 | return i; | |
309 | ||
310 | if (i >= files_allocated) | |
fac0d250 | 311 | { |
249e3833 RH |
312 | unsigned int old = files_allocated; |
313 | ||
220e750f RH |
314 | files_allocated = i + 32; |
315 | files = (struct file_entry *) | |
ee515fb7 | 316 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
249e3833 RH |
317 | |
318 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
319 | } |
320 | ||
ee515fb7 | 321 | files[i].filename = xstrdup (filename); |
220e750f RH |
322 | files[i].dir = 0; |
323 | files_in_use = i + 1; | |
324 | last_used = i; | |
325 | ||
326 | return i; | |
327 | } | |
fac0d250 | 328 | |
220e750f RH |
329 | /* Handle the .file directive. */ |
330 | ||
331 | void | |
332 | dwarf2_directive_file (dummy) | |
333 | int dummy ATTRIBUTE_UNUSED; | |
334 | { | |
335 | offsetT num; | |
e46d99eb | 336 | char *filename; |
220e750f RH |
337 | int filename_len; |
338 | ||
339 | /* Continue to accept a bare string and pass it off. */ | |
340 | SKIP_WHITESPACE (); | |
341 | if (*input_line_pointer == '"') | |
fac0d250 | 342 | { |
220e750f | 343 | s_app_file (0); |
fac0d250 RH |
344 | return; |
345 | } | |
346 | ||
220e750f RH |
347 | num = get_absolute_expression (); |
348 | filename = demand_copy_C_string (&filename_len); | |
349 | demand_empty_rest_of_line (); | |
350 | ||
249e3833 | 351 | if (num < 1) |
fac0d250 | 352 | { |
0e389e77 | 353 | as_bad (_("file number less than one")); |
fac0d250 RH |
354 | return; |
355 | } | |
356 | ||
0e1a166b | 357 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 358 | { |
0e389e77 | 359 | as_bad (_("file number %ld already allocated"), (long) num); |
249e3833 RH |
360 | return; |
361 | } | |
220e750f | 362 | |
249e3833 RH |
363 | if (num >= (int) files_allocated) |
364 | { | |
365 | unsigned int old = files_allocated; | |
366 | ||
367 | files_allocated = num + 16; | |
368 | files = (struct file_entry *) | |
369 | xrealloc (files, (num + 16) * sizeof (struct file_entry)); | |
fac0d250 | 370 | |
220e750f | 371 | /* Zero the new memory. */ |
249e3833 | 372 | memset (files + old, 0, (num + 16 - old) * sizeof (struct file_entry)); |
220e750f RH |
373 | } |
374 | ||
249e3833 RH |
375 | files[num].filename = filename; |
376 | files[num].dir = 0; | |
377 | files_in_use = num + 1; | |
fac0d250 RH |
378 | } |
379 | ||
220e750f RH |
380 | void |
381 | dwarf2_directive_loc (dummy) | |
382 | int dummy ATTRIBUTE_UNUSED; | |
383 | { | |
384 | offsetT filenum, line, column; | |
385 | ||
386 | filenum = get_absolute_expression (); | |
387 | SKIP_WHITESPACE (); | |
388 | line = get_absolute_expression (); | |
389 | SKIP_WHITESPACE (); | |
390 | column = get_absolute_expression (); | |
391 | demand_empty_rest_of_line (); | |
392 | ||
249e3833 | 393 | if (filenum < 1) |
220e750f | 394 | { |
0e389e77 | 395 | as_bad (_("file number less than one")); |
220e750f RH |
396 | return; |
397 | } | |
249e3833 | 398 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
220e750f | 399 | { |
0e389e77 | 400 | as_bad (_("unassigned file number %ld"), (long) filenum); |
220e750f RH |
401 | return; |
402 | } | |
403 | ||
249e3833 | 404 | current.filenum = filenum; |
220e750f RH |
405 | current.line = line; |
406 | current.column = column; | |
407 | current.flags = DWARF2_FLAG_BEGIN_STMT; | |
408 | ||
409 | loc_directive_seen = true; | |
410 | ||
411 | #ifndef NO_LISTING | |
412 | if (listing) | |
413 | listing_source_line (line); | |
414 | #endif | |
415 | } | |
220e750f RH |
416 | \f |
417 | static struct frag * | |
418 | first_frag_for_seg (seg) | |
419 | segT seg; | |
420 | { | |
421 | frchainS *f, *first = NULL; | |
422 | ||
ee515fb7 | 423 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
424 | if (f->frch_seg == seg |
425 | && (! first || first->frch_subseg > f->frch_subseg)) | |
426 | first = f; | |
427 | ||
428 | return first ? first->frch_root : NULL; | |
429 | } | |
430 | ||
431 | static struct frag * | |
432 | last_frag_for_seg (seg) | |
433 | segT seg; | |
434 | { | |
435 | frchainS *f, *last = NULL; | |
436 | ||
ee515fb7 | 437 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
438 | if (f->frch_seg == seg |
439 | && (! last || last->frch_subseg < f->frch_subseg)) | |
440 | last= f; | |
441 | ||
442 | return last ? last->frch_last : NULL; | |
443 | } | |
444 | \f | |
445 | /* Emit a single byte into the current segment. */ | |
446 | ||
447 | static inline void | |
448 | out_byte (byte) | |
449 | int byte; | |
450 | { | |
451 | FRAG_APPEND_1_CHAR (byte); | |
452 | } | |
453 | ||
454 | /* Emit a statement program opcode into the current segment. */ | |
455 | ||
456 | static inline void | |
457 | out_opcode (opc) | |
458 | int opc; | |
459 | { | |
460 | out_byte (opc); | |
461 | } | |
462 | ||
463 | /* Emit a two-byte word into the current segment. */ | |
464 | ||
465 | static inline void | |
466 | out_two (data) | |
467 | int data; | |
468 | { | |
469 | md_number_to_chars (frag_more (2), data, 2); | |
470 | } | |
471 | ||
472 | /* Emit a four byte word into the current segment. */ | |
473 | ||
474 | static inline void | |
475 | out_four (data) | |
476 | int data; | |
477 | { | |
478 | md_number_to_chars (frag_more (4), data, 4); | |
479 | } | |
480 | ||
481 | /* Emit an unsigned "little-endian base 128" number. */ | |
482 | ||
fac0d250 | 483 | static void |
220e750f RH |
484 | out_uleb128 (value) |
485 | addressT value; | |
486 | { | |
487 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
488 | } | |
489 | ||
490 | /* Emit a tuple for .debug_abbrev. */ | |
491 | ||
492 | static inline void | |
493 | out_abbrev (name, form) | |
494 | int name, form; | |
fac0d250 | 495 | { |
220e750f RH |
496 | out_uleb128 (name); |
497 | out_uleb128 (form); | |
498 | } | |
fac0d250 | 499 | |
220e750f RH |
500 | /* Create a new fake symbol whose value is the current position. */ |
501 | ||
502 | static symbolS * | |
503 | symbol_new_now () | |
504 | { | |
505 | return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); | |
fac0d250 RH |
506 | } |
507 | ||
220e750f | 508 | /* Set the value of SYM to the current position in the current segment. */ |
353e2c69 | 509 | |
fac0d250 | 510 | static void |
220e750f RH |
511 | set_symbol_value_now (sym) |
512 | symbolS *sym; | |
fac0d250 | 513 | { |
220e750f RH |
514 | S_SET_SEGMENT (sym, now_seg); |
515 | S_SET_VALUE (sym, frag_now_fix ()); | |
516 | symbol_set_frag (sym, frag_now); | |
517 | } | |
518 | ||
519 | /* Get the size of a fragment. */ | |
fac0d250 | 520 | |
220e750f RH |
521 | static offsetT |
522 | get_frag_fix (frag) | |
523 | fragS *frag; | |
524 | { | |
525 | frchainS *fr; | |
526 | ||
527 | if (frag->fr_next) | |
528 | return frag->fr_fix; | |
529 | ||
530 | /* If a fragment is the last in the chain, special measures must be | |
531 | taken to find its size before relaxation, since it may be pending | |
532 | on some subsegment chain. */ | |
ee515fb7 | 533 | for (fr = frchain_root; fr; fr = fr->frch_next) |
220e750f RH |
534 | if (fr->frch_last == frag) |
535 | { | |
7c2b59d0 AM |
536 | long align_mask = -1 << get_recorded_alignment (fr->frch_seg); |
537 | return (((char *) obstack_next_free (&fr->frch_obstack) | |
538 | - frag->fr_literal) + ~align_mask) & align_mask; | |
220e750f RH |
539 | } |
540 | ||
541 | abort (); | |
542 | } | |
fac0d250 | 543 | |
220e750f | 544 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 545 | |
220e750f RH |
546 | static void |
547 | out_set_addr (seg, frag, ofs) | |
548 | segT seg; | |
549 | fragS *frag; | |
550 | addressT ofs; | |
551 | { | |
552 | expressionS expr; | |
553 | symbolS *sym; | |
fac0d250 | 554 | |
220e750f | 555 | sym = symbol_new (fake_label_name, seg, ofs, frag); |
9e3af0e7 | 556 | |
fac0d250 | 557 | out_opcode (DW_LNS_extended_op); |
220e750f | 558 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
559 | |
560 | out_opcode (DW_LNE_set_address); | |
561 | expr.X_op = O_symbol; | |
562 | expr.X_add_symbol = sym; | |
563 | expr.X_add_number = 0; | |
220e750f | 564 | emit_expr (&expr, sizeof_address); |
fac0d250 RH |
565 | } |
566 | ||
220e750f RH |
567 | /* Encode a pair of line and address skips as efficiently as possible. |
568 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 569 | |
220e750f RH |
570 | The following two routines *must* be kept in sync. This is |
571 | enforced by making emit_inc_line_addr abort if we do not emit | |
572 | exactly the expected number of bytes. */ | |
573 | ||
574 | static int | |
575 | size_inc_line_addr (line_delta, addr_delta) | |
576 | int line_delta; | |
577 | addressT addr_delta; | |
fac0d250 | 578 | { |
220e750f RH |
579 | unsigned int tmp, opcode; |
580 | int len = 0; | |
fac0d250 | 581 | |
220e750f | 582 | /* Scale the address delta by the minimum instruction length. */ |
ee515fb7 | 583 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
584 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); |
585 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 586 | #endif |
220e750f RH |
587 | |
588 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
589 | We cannot use special opcodes here, since we want the end_sequence | |
590 | to emit the matrix entry. */ | |
591 | if (line_delta == INT_MAX) | |
fac0d250 | 592 | { |
220e750f RH |
593 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
594 | len = 1; | |
fac0d250 | 595 | else |
220e750f RH |
596 | len = 1 + sizeof_leb128 (addr_delta, 0); |
597 | return len + 3; | |
fac0d250 | 598 | } |
fac0d250 | 599 | |
220e750f RH |
600 | /* Bias the line delta by the base. */ |
601 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 602 | |
220e750f RH |
603 | /* If the line increment is out of range of a special opcode, we |
604 | must encode it with DW_LNS_advance_line. */ | |
605 | if (tmp >= DWARF2_LINE_RANGE) | |
606 | { | |
607 | len = 1 + sizeof_leb128 (line_delta, 1); | |
608 | line_delta = 0; | |
609 | tmp = 0 - DWARF2_LINE_BASE; | |
610 | } | |
fac0d250 | 611 | |
220e750f RH |
612 | /* Bias the opcode by the special opcode base. */ |
613 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 614 | |
220e750f RH |
615 | /* Avoid overflow when addr_delta is large. */ |
616 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
617 | { | |
618 | /* Try using a special opcode. */ | |
619 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
620 | if (opcode <= 255) | |
621 | return len + 1; | |
622 | ||
623 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
624 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
625 | if (opcode <= 255) | |
626 | return len + 2; | |
627 | } | |
628 | ||
629 | /* Otherwise use DW_LNS_advance_pc. */ | |
630 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
631 | ||
632 | /* DW_LNS_copy or special opcode. */ | |
633 | len += 1; | |
634 | ||
635 | return len; | |
636 | } | |
fac0d250 | 637 | |
220e750f RH |
638 | static void |
639 | emit_inc_line_addr (line_delta, addr_delta, p, len) | |
640 | int line_delta; | |
641 | addressT addr_delta; | |
642 | char *p; | |
643 | int len; | |
644 | { | |
645 | unsigned int tmp, opcode; | |
646 | int need_copy = 0; | |
647 | char *end = p + len; | |
fac0d250 | 648 | |
ee515fb7 | 649 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
650 | /* Scale the address delta by the minimum instruction length. */ |
651 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); | |
652 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 653 | #endif |
220e750f RH |
654 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
655 | We cannot use special opcodes here, since we want the end_sequence | |
656 | to emit the matrix entry. */ | |
657 | if (line_delta == INT_MAX) | |
fac0d250 | 658 | { |
220e750f RH |
659 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
660 | *p++ = DW_LNS_const_add_pc; | |
661 | else | |
fac0d250 | 662 | { |
220e750f RH |
663 | *p++ = DW_LNS_advance_pc; |
664 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 665 | } |
220e750f RH |
666 | |
667 | *p++ = DW_LNS_extended_op; | |
668 | *p++ = 1; | |
669 | *p++ = DW_LNE_end_sequence; | |
670 | goto done; | |
fac0d250 RH |
671 | } |
672 | ||
220e750f RH |
673 | /* Bias the line delta by the base. */ |
674 | tmp = line_delta - DWARF2_LINE_BASE; | |
675 | ||
676 | /* If the line increment is out of range of a special opcode, we | |
677 | must encode it with DW_LNS_advance_line. */ | |
678 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 679 | { |
220e750f RH |
680 | *p++ = DW_LNS_advance_line; |
681 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 682 | |
220e750f RH |
683 | /* Prettier, I think, to use DW_LNS_copy instead of a |
684 | "line +0, addr +0" special opcode. */ | |
685 | if (addr_delta == 0) | |
686 | { | |
687 | *p++ = DW_LNS_copy; | |
688 | goto done; | |
689 | } | |
cb30237e | 690 | |
220e750f RH |
691 | line_delta = 0; |
692 | tmp = 0 - DWARF2_LINE_BASE; | |
693 | need_copy = 1; | |
694 | } | |
fac0d250 | 695 | |
220e750f RH |
696 | /* Bias the opcode by the special opcode base. */ |
697 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 698 | |
220e750f RH |
699 | /* Avoid overflow when addr_delta is large. */ |
700 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 701 | { |
220e750f RH |
702 | /* Try using a special opcode. */ |
703 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
704 | if (opcode <= 255) | |
705 | { | |
706 | *p++ = opcode; | |
707 | goto done; | |
708 | } | |
709 | ||
710 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
711 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
712 | if (opcode <= 255) | |
fac0d250 | 713 | { |
220e750f RH |
714 | *p++ = DW_LNS_const_add_pc; |
715 | *p++ = opcode; | |
716 | goto done; | |
fac0d250 RH |
717 | } |
718 | } | |
220e750f RH |
719 | |
720 | /* Otherwise use DW_LNS_advance_pc. */ | |
721 | *p++ = DW_LNS_advance_pc; | |
722 | p += output_leb128 (p, addr_delta, 0); | |
723 | ||
724 | if (need_copy) | |
725 | *p++ = DW_LNS_copy; | |
fac0d250 | 726 | else |
220e750f | 727 | *p++ = tmp; |
fac0d250 | 728 | |
220e750f RH |
729 | done: |
730 | assert (p == end); | |
731 | } | |
a8316fe2 | 732 | |
220e750f | 733 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 734 | |
220e750f RH |
735 | static void |
736 | out_inc_line_addr (line_delta, addr_delta) | |
737 | int line_delta; | |
738 | addressT addr_delta; | |
739 | { | |
740 | int len = size_inc_line_addr (line_delta, addr_delta); | |
741 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
742 | } | |
9de8d8f1 | 743 | |
220e750f RH |
744 | /* Generate a variant frag that we can use to relax address/line |
745 | increments between fragments of the target segment. */ | |
9e3af0e7 | 746 | |
220e750f RH |
747 | static void |
748 | relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) | |
749 | int line_delta; | |
750 | segT seg; | |
751 | fragS *to_frag, *from_frag; | |
752 | addressT to_ofs, from_ofs; | |
753 | { | |
754 | symbolS *to_sym, *from_sym; | |
755 | expressionS expr; | |
756 | int max_chars; | |
6576f0b5 | 757 | |
220e750f RH |
758 | to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); |
759 | from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); | |
fac0d250 | 760 | |
220e750f RH |
761 | expr.X_op = O_subtract; |
762 | expr.X_add_symbol = to_sym; | |
763 | expr.X_op_symbol = from_sym; | |
764 | expr.X_add_number = 0; | |
fac0d250 | 765 | |
220e750f RH |
766 | /* The maximum size of the frag is the line delta with a maximum |
767 | sized address delta. */ | |
768 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 769 | |
220e750f RH |
770 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
771 | make_expr_symbol (&expr), line_delta, NULL); | |
772 | } | |
fac0d250 | 773 | |
220e750f RH |
774 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
775 | based on the current values of the symbols. It is called before | |
776 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 777 | |
220e750f RH |
778 | int |
779 | dwarf2dbg_estimate_size_before_relax (frag) | |
780 | fragS *frag; | |
781 | { | |
782 | offsetT addr_delta; | |
783 | int size; | |
fac0d250 | 784 | |
6386f3a7 | 785 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
220e750f | 786 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
fac0d250 | 787 | |
220e750f | 788 | frag->fr_subtype = size; |
fac0d250 | 789 | |
220e750f RH |
790 | return size; |
791 | } | |
792 | ||
793 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
794 | current values of the symbols. fr_subtype is the current length | |
795 | of the frag. This returns the change in frag length. */ | |
796 | ||
797 | int | |
798 | dwarf2dbg_relax_frag (frag) | |
799 | fragS *frag; | |
800 | { | |
801 | int old_size, new_size; | |
fac0d250 | 802 | |
220e750f RH |
803 | old_size = frag->fr_subtype; |
804 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 805 | |
220e750f | 806 | return new_size - old_size; |
fac0d250 RH |
807 | } |
808 | ||
220e750f RH |
809 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
810 | fill frag. This is called after all relaxation has been done. | |
811 | fr_subtype will be the desired length of the frag. */ | |
812 | ||
813 | void | |
814 | dwarf2dbg_convert_frag (frag) | |
815 | fragS *frag; | |
fac0d250 | 816 | { |
220e750f RH |
817 | offsetT addr_diff; |
818 | ||
6386f3a7 | 819 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
fac0d250 | 820 | |
220e750f RH |
821 | /* fr_var carries the max_chars that we created the fragment with. |
822 | fr_subtype carries the current expected length. We must, of | |
823 | course, have allocated enough memory earlier. */ | |
bccba5f0 | 824 | assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 825 | |
ee515fb7 | 826 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
220e750f RH |
827 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
828 | ||
829 | frag->fr_fix += frag->fr_subtype; | |
830 | frag->fr_type = rs_fill; | |
831 | frag->fr_var = 0; | |
832 | frag->fr_offset = 0; | |
833 | } | |
834 | ||
835 | /* Generate .debug_line content for the chain of line number entries | |
836 | beginning at E, for segment SEG. */ | |
837 | ||
838 | static void | |
839 | process_entries (seg, e) | |
840 | segT seg; | |
841 | struct line_entry *e; | |
842 | { | |
843 | unsigned filenum = 1; | |
844 | unsigned line = 1; | |
845 | unsigned column = 0; | |
846 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; | |
847 | fragS *frag = NULL; | |
848 | fragS *last_frag; | |
849 | addressT frag_ofs = 0; | |
850 | addressT last_frag_ofs; | |
851 | struct line_entry *next; | |
852 | ||
853 | while (e) | |
fac0d250 | 854 | { |
220e750f RH |
855 | int changed = 0; |
856 | ||
857 | if (filenum != e->loc.filenum) | |
fac0d250 | 858 | { |
220e750f RH |
859 | filenum = e->loc.filenum; |
860 | out_opcode (DW_LNS_set_file); | |
861 | out_uleb128 (filenum); | |
862 | changed = 1; | |
863 | } | |
864 | ||
865 | if (column != e->loc.column) | |
866 | { | |
867 | column = e->loc.column; | |
868 | out_opcode (DW_LNS_set_column); | |
869 | out_uleb128 (column); | |
870 | changed = 1; | |
871 | } | |
872 | ||
873 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) | |
874 | { | |
875 | flags = e->loc.flags; | |
876 | out_opcode (DW_LNS_negate_stmt); | |
877 | changed = 1; | |
878 | } | |
879 | ||
880 | if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) | |
881 | { | |
882 | out_opcode (DW_LNS_set_basic_block); | |
883 | changed = 1; | |
884 | } | |
885 | ||
fb81275c JM |
886 | /* Don't try to optimize away redundant entries; gdb wants two |
887 | entries for a function where the code starts on the same line as | |
888 | the {, and there's no way to identify that case here. Trust gcc | |
889 | to optimize appropriately. */ | |
890 | if (1 /* line != e->loc.line || changed */) | |
220e750f RH |
891 | { |
892 | int line_delta = e->loc.line - line; | |
893 | if (frag == NULL) | |
fac0d250 | 894 | { |
220e750f RH |
895 | out_set_addr (seg, e->frag, e->frag_ofs); |
896 | out_inc_line_addr (line_delta, 0); | |
fac0d250 | 897 | } |
220e750f RH |
898 | else if (frag == e->frag) |
899 | out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); | |
900 | else | |
901 | relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, | |
902 | frag, frag_ofs); | |
903 | ||
904 | frag = e->frag; | |
905 | frag_ofs = e->frag_ofs; | |
906 | line = e->loc.line; | |
fac0d250 | 907 | } |
220e750f RH |
908 | else if (frag == NULL) |
909 | { | |
910 | out_set_addr (seg, e->frag, e->frag_ofs); | |
911 | frag = e->frag; | |
912 | frag_ofs = e->frag_ofs; | |
913 | } | |
914 | ||
915 | next = e->next; | |
916 | free (e); | |
917 | e = next; | |
fac0d250 | 918 | } |
353e2c69 | 919 | |
220e750f RH |
920 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
921 | last_frag = last_frag_for_seg (seg); | |
922 | last_frag_ofs = get_frag_fix (last_frag); | |
923 | if (frag == last_frag) | |
924 | out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); | |
925 | else | |
ee515fb7 | 926 | relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, |
220e750f | 927 | frag, frag_ofs); |
fac0d250 RH |
928 | } |
929 | ||
220e750f RH |
930 | /* Emit the directory and file tables for .debug_line. */ |
931 | ||
fac0d250 | 932 | static void |
220e750f | 933 | out_file_list () |
fac0d250 RH |
934 | { |
935 | size_t size; | |
936 | char *cp; | |
220e750f RH |
937 | unsigned int i; |
938 | ||
939 | /* Terminate directory list. */ | |
940 | out_byte ('\0'); | |
fac0d250 | 941 | |
220e750f | 942 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 943 | { |
249e3833 RH |
944 | if (files[i].filename == NULL) |
945 | { | |
0e389e77 | 946 | as_bad (_("unassigned file number %ld"), (long) i); |
249e3833 RH |
947 | continue; |
948 | } | |
949 | ||
220e750f | 950 | size = strlen (files[i].filename) + 1; |
fac0d250 | 951 | cp = frag_more (size); |
220e750f | 952 | memcpy (cp, files[i].filename, size); |
fac0d250 | 953 | |
220e750f | 954 | out_uleb128 (files[i].dir); /* directory number */ |
fac0d250 RH |
955 | out_uleb128 (0); /* last modification timestamp */ |
956 | out_uleb128 (0); /* filesize */ | |
957 | } | |
353e2c69 KH |
958 | |
959 | /* Terminate filename list. */ | |
960 | out_byte (0); | |
fac0d250 RH |
961 | } |
962 | ||
220e750f RH |
963 | /* Emit the collected .debug_line data. */ |
964 | ||
965 | static void | |
966 | out_debug_line (line_seg) | |
967 | segT line_seg; | |
968 | { | |
969 | expressionS expr; | |
970 | symbolS *line_start; | |
971 | symbolS *prologue_end; | |
972 | symbolS *line_end; | |
973 | struct line_seg *s; | |
974 | ||
975 | subseg_set (line_seg, 0); | |
976 | ||
977 | line_start = symbol_new_now (); | |
978 | prologue_end = symbol_make (fake_label_name); | |
979 | line_end = symbol_make (fake_label_name); | |
980 | ||
981 | /* Total length of the information for this compilation unit. */ | |
982 | expr.X_op = O_subtract; | |
983 | expr.X_add_symbol = line_end; | |
984 | expr.X_op_symbol = line_start; | |
985 | expr.X_add_number = -4; | |
986 | emit_expr (&expr, 4); | |
987 | ||
988 | /* Version. */ | |
989 | out_two (2); | |
990 | ||
991 | /* Length of the prologue following this length. */ | |
992 | expr.X_op = O_subtract; | |
993 | expr.X_add_symbol = prologue_end; | |
994 | expr.X_op_symbol = line_start; | |
995 | expr.X_add_number = - (4 + 2 + 4); | |
996 | emit_expr (&expr, 4); | |
997 | ||
998 | /* Parameters of the state machine. */ | |
999 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1000 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1001 | out_byte (DWARF2_LINE_BASE); | |
1002 | out_byte (DWARF2_LINE_RANGE); | |
1003 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1004 | ||
1005 | /* Standard opcode lengths. */ | |
1006 | out_byte (0); /* DW_LNS_copy */ | |
1007 | out_byte (1); /* DW_LNS_advance_pc */ | |
1008 | out_byte (1); /* DW_LNS_advance_line */ | |
1009 | out_byte (1); /* DW_LNS_set_file */ | |
1010 | out_byte (1); /* DW_LNS_set_column */ | |
1011 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1012 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1013 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1014 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
1015 | ||
1016 | out_file_list (); | |
1017 | ||
1018 | set_symbol_value_now (prologue_end); | |
1019 | ||
1020 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1021 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1022 | process_entries (s->seg, s->head->head); |
1023 | ||
1024 | set_symbol_value_now (line_end); | |
1025 | } | |
1026 | ||
1027 | /* Emit data for .debug_aranges. */ | |
1028 | ||
58b5739a | 1029 | static void |
220e750f RH |
1030 | out_debug_aranges (aranges_seg, info_seg) |
1031 | segT aranges_seg; | |
1032 | segT info_seg; | |
fac0d250 | 1033 | { |
220e750f RH |
1034 | unsigned int addr_size = sizeof_address; |
1035 | addressT size, skip; | |
1036 | struct line_seg *s; | |
1037 | expressionS expr; | |
1038 | char *p; | |
fac0d250 | 1039 | |
220e750f | 1040 | size = 4 + 2 + 4 + 1 + 1; |
fac0d250 | 1041 | |
ee515fb7 KH |
1042 | skip = 2 * addr_size - (size & (2 * addr_size - 1)); |
1043 | if (skip == 2 * addr_size) | |
220e750f RH |
1044 | skip = 0; |
1045 | size += skip; | |
fac0d250 | 1046 | |
ee515fb7 KH |
1047 | for (s = all_segs; s; s = s->next) |
1048 | size += 2 * addr_size; | |
fac0d250 | 1049 | |
ee515fb7 | 1050 | size += 2 * addr_size; |
fac0d250 | 1051 | |
220e750f | 1052 | subseg_set (aranges_seg, 0); |
fac0d250 | 1053 | |
220e750f RH |
1054 | /* Length of the compilation unit. */ |
1055 | out_four (size - 4); | |
fac0d250 | 1056 | |
220e750f RH |
1057 | /* Version. */ |
1058 | out_two (2); | |
4dc7ead9 | 1059 | |
220e750f RH |
1060 | /* Offset to .debug_info. */ |
1061 | expr.X_op = O_symbol; | |
1062 | expr.X_add_symbol = section_symbol (info_seg); | |
1063 | expr.X_add_number = 0; | |
1064 | emit_expr (&expr, 4); | |
1065 | ||
1066 | /* Size of an address (offset portion). */ | |
1067 | out_byte (addr_size); | |
1068 | ||
1069 | /* Size of a segment descriptor. */ | |
1070 | out_byte (0); | |
1071 | ||
1072 | /* Align the header. */ | |
1073 | if (skip) | |
ee515fb7 | 1074 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
4dc7ead9 | 1075 | |
ee515fb7 | 1076 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1077 | { |
1078 | fragS *frag; | |
1079 | symbolS *beg, *end; | |
1080 | ||
1081 | frag = first_frag_for_seg (s->seg); | |
1082 | beg = symbol_new (fake_label_name, s->seg, 0, frag); | |
1083 | s->text_start = beg; | |
1084 | ||
1085 | frag = last_frag_for_seg (s->seg); | |
1086 | end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); | |
1087 | s->text_end = end; | |
1088 | ||
1089 | expr.X_op = O_symbol; | |
1090 | expr.X_add_symbol = beg; | |
1091 | expr.X_add_number = 0; | |
1092 | emit_expr (&expr, addr_size); | |
1093 | ||
1094 | expr.X_op = O_subtract; | |
1095 | expr.X_add_symbol = end; | |
1096 | expr.X_op_symbol = beg; | |
1097 | expr.X_add_number = 0; | |
1098 | emit_expr (&expr, addr_size); | |
1099 | } | |
4dc7ead9 | 1100 | |
220e750f RH |
1101 | p = frag_more (2 * addr_size); |
1102 | md_number_to_chars (p, 0, addr_size); | |
1103 | md_number_to_chars (p + addr_size, 0, addr_size); | |
4dc7ead9 RH |
1104 | } |
1105 | ||
220e750f RH |
1106 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1107 | sync with out_debug_info below. */ | |
fac0d250 | 1108 | |
220e750f RH |
1109 | static void |
1110 | out_debug_abbrev (abbrev_seg) | |
1111 | segT abbrev_seg; | |
1112 | { | |
1113 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1114 | |
220e750f RH |
1115 | out_uleb128 (1); |
1116 | out_uleb128 (DW_TAG_compile_unit); | |
1117 | out_byte (DW_CHILDREN_no); | |
1118 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1119 | if (all_segs->next == NULL) | |
4dc7ead9 | 1120 | { |
220e750f RH |
1121 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
1122 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1123 | } | |
1124 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); | |
1125 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1126 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1127 | out_abbrev (0, 0); | |
a987bfc9 RH |
1128 | |
1129 | /* Terminate the abbreviations for this compilation unit. */ | |
1130 | out_byte (0); | |
220e750f | 1131 | } |
4dc7ead9 | 1132 | |
220e750f | 1133 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1134 | |
220e750f RH |
1135 | static void |
1136 | out_debug_info (info_seg, abbrev_seg, line_seg) | |
1137 | segT info_seg; | |
1138 | segT abbrev_seg; | |
1139 | segT line_seg; | |
1140 | { | |
1141 | char producer[128]; | |
1142 | char *comp_dir; | |
1143 | expressionS expr; | |
1144 | symbolS *info_start; | |
1145 | symbolS *info_end; | |
1146 | char *p; | |
1147 | int len; | |
4dc7ead9 | 1148 | |
220e750f | 1149 | subseg_set (info_seg, 0); |
4dc7ead9 | 1150 | |
ee515fb7 | 1151 | info_start = symbol_new_now (); |
220e750f | 1152 | info_end = symbol_make (fake_label_name); |
4dc7ead9 | 1153 | |
220e750f RH |
1154 | /* Compilation Unit length. */ |
1155 | expr.X_op = O_subtract; | |
1156 | expr.X_add_symbol = info_end; | |
1157 | expr.X_op_symbol = info_start; | |
1158 | expr.X_add_number = -4; | |
1159 | emit_expr (&expr, 4); | |
4dc7ead9 | 1160 | |
220e750f RH |
1161 | /* DWARF version. */ |
1162 | out_two (2); | |
4dc7ead9 | 1163 | |
220e750f RH |
1164 | /* .debug_abbrev offset */ |
1165 | expr.X_op = O_symbol; | |
1166 | expr.X_add_symbol = section_symbol (abbrev_seg); | |
1167 | expr.X_add_number = 0; | |
1168 | emit_expr (&expr, 4); | |
4dc7ead9 | 1169 | |
220e750f RH |
1170 | /* Target address size. */ |
1171 | out_byte (sizeof_address); | |
fac0d250 | 1172 | |
220e750f RH |
1173 | /* DW_TAG_compile_unit DIE abbrev */ |
1174 | out_uleb128 (1); | |
fac0d250 | 1175 | |
220e750f RH |
1176 | /* DW_AT_stmt_list */ |
1177 | expr.X_op = O_symbol; | |
1178 | expr.X_add_symbol = section_symbol (line_seg); | |
1179 | expr.X_add_number = 0; | |
1180 | emit_expr (&expr, 4); | |
fac0d250 | 1181 | |
220e750f RH |
1182 | /* These two attributes may only be emitted if all of the code is |
1183 | contiguous. Multiple sections are not that. */ | |
1184 | if (all_segs->next == NULL) | |
58b5739a | 1185 | { |
220e750f RH |
1186 | /* DW_AT_low_pc */ |
1187 | expr.X_op = O_symbol; | |
1188 | expr.X_add_symbol = all_segs->text_start; | |
1189 | expr.X_add_number = 0; | |
1190 | emit_expr (&expr, sizeof_address); | |
1191 | ||
1192 | /* DW_AT_high_pc */ | |
1193 | expr.X_op = O_symbol; | |
1194 | expr.X_add_symbol = all_segs->text_end; | |
1195 | expr.X_add_number = 0; | |
1196 | emit_expr (&expr, sizeof_address); | |
58b5739a RH |
1197 | } |
1198 | ||
220e750f RH |
1199 | /* DW_AT_comp_dir */ |
1200 | comp_dir = getpwd (); | |
1201 | len = strlen (comp_dir) + 1; | |
1202 | p = frag_more (len); | |
1203 | memcpy (p, comp_dir, len); | |
fac0d250 | 1204 | |
220e750f RH |
1205 | /* DW_AT_producer */ |
1206 | sprintf (producer, "GNU AS %s", VERSION); | |
1207 | len = strlen (producer) + 1; | |
1208 | p = frag_more (len); | |
1209 | memcpy (p, producer, len); | |
fac0d250 | 1210 | |
220e750f RH |
1211 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1212 | dwarf2 draft has no standard code for assembler. */ | |
1213 | out_two (DW_LANG_Mips_Assembler); | |
1214 | ||
1215 | set_symbol_value_now (info_end); | |
fac0d250 RH |
1216 | } |
1217 | ||
1218 | void | |
220e750f | 1219 | dwarf2_finish () |
fac0d250 | 1220 | { |
220e750f RH |
1221 | segT line_seg; |
1222 | struct line_seg *s; | |
fac0d250 | 1223 | |
220e750f | 1224 | /* If no debug information was recorded, nothing to do. */ |
45c500fa | 1225 | if (all_segs == NULL && files_in_use <= 1) |
220e750f | 1226 | return; |
fac0d250 | 1227 | |
220e750f | 1228 | /* Calculate the size of an address for the target machine. */ |
220e750f | 1229 | sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8; |
fac0d250 | 1230 | |
220e750f RH |
1231 | /* Create and switch to the line number section. */ |
1232 | line_seg = subseg_new (".debug_line", 0); | |
220e750f | 1233 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); |
fac0d250 | 1234 | |
220e750f | 1235 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1236 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1237 | { |
220e750f RH |
1238 | struct line_subseg *ss = s->head; |
1239 | struct line_entry **ptail = ss->ptail; | |
1240 | ||
1241 | while ((ss = ss->next) != NULL) | |
1242 | { | |
1243 | *ptail = ss->head; | |
1244 | ptail = ss->ptail; | |
1245 | } | |
fac0d250 | 1246 | } |
85a39694 | 1247 | |
220e750f | 1248 | out_debug_line (line_seg); |
85a39694 | 1249 | |
220e750f RH |
1250 | /* If this is assembler generated line info, we need .debug_info |
1251 | and .debug_abbrev sections as well. */ | |
45c500fa | 1252 | if (all_segs != NULL && debug_type == DEBUG_DWARF2) |
220e750f RH |
1253 | { |
1254 | segT abbrev_seg; | |
1255 | segT info_seg; | |
1256 | segT aranges_seg; | |
4dc7ead9 | 1257 | |
220e750f RH |
1258 | info_seg = subseg_new (".debug_info", 0); |
1259 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1260 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1261 | |
220e750f RH |
1262 | bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); |
1263 | bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); | |
1264 | bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); | |
ef99799a | 1265 | |
ee515fb7 | 1266 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1267 | |
220e750f RH |
1268 | out_debug_aranges (aranges_seg, info_seg); |
1269 | out_debug_abbrev (abbrev_seg); | |
1270 | out_debug_info (info_seg, abbrev_seg, line_seg); | |
1271 | } | |
85a39694 | 1272 | } |
92eb7b32 L |
1273 | |
1274 | #else | |
1275 | void | |
1276 | dwarf2_finish () | |
1277 | { | |
1278 | } | |
1279 | ||
1280 | int | |
1281 | dwarf2dbg_estimate_size_before_relax (frag) | |
1282 | fragS *frag ATTRIBUTE_UNUSED; | |
1283 | { | |
1284 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | int | |
1289 | dwarf2dbg_relax_frag (frag) | |
1290 | fragS *frag ATTRIBUTE_UNUSED; | |
1291 | { | |
1292 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | void | |
1297 | dwarf2dbg_convert_frag (frag) | |
1298 | fragS *frag ATTRIBUTE_UNUSED; | |
1299 | { | |
1300 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1301 | } | |
1302 | ||
1303 | void | |
1304 | dwarf2_emit_insn (size) | |
1305 | int size ATTRIBUTE_UNUSED; | |
1306 | { | |
1307 | } | |
1308 | ||
1309 | void | |
1310 | dwarf2_directive_file (dummy) | |
1311 | int dummy ATTRIBUTE_UNUSED; | |
1312 | { | |
3737d051 | 1313 | s_app_file (0); |
92eb7b32 L |
1314 | } |
1315 | ||
1316 | void | |
1317 | dwarf2_directive_loc (dummy) | |
1318 | int dummy ATTRIBUTE_UNUSED; | |
1319 | { | |
1320 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1321 | } | |
1322 | #endif /* BFD_ASSEMBLER */ |