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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 | ||
ffa554ed GK |
240 | /* Don't emit sequences of line symbols for the same line when the |
241 | symbols apply to assembler code. It is necessary to emit | |
242 | duplicate line symbols when a compiler asks for them, because GDB | |
243 | uses them to determine the end of the prologue. */ | |
d1a6c242 | 244 | if (debug_type == DEBUG_DWARF2 |
ffa554ed | 245 | && line == loc->line && filenum == loc->filenum) |
1ea5c325 MS |
246 | return; |
247 | ||
248 | line = loc->line; | |
249 | filenum = loc->filenum; | |
250 | ||
220e750f RH |
251 | e = (struct line_entry *) xmalloc (sizeof (*e)); |
252 | e->next = NULL; | |
253 | e->frag = frag_now; | |
254 | e->frag_ofs = ofs; | |
255 | e->loc = *loc; | |
256 | ||
257 | ss = get_line_subseg (now_seg, now_subseg); | |
258 | *ss->ptail = e; | |
259 | ss->ptail = &e->next; | |
260 | } | |
fac0d250 | 261 | |
220e750f RH |
262 | void |
263 | dwarf2_where (line) | |
264 | struct dwarf2_line_info *line; | |
265 | { | |
266 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 267 | { |
220e750f RH |
268 | char *filename; |
269 | as_where (&filename, &line->line); | |
270 | line->filenum = get_filenum (filename); | |
271 | line->column = 0; | |
272 | line->flags = DWARF2_FLAG_BEGIN_STMT; | |
fac0d250 | 273 | } |
220e750f RH |
274 | else |
275 | *line = current; | |
fac0d250 RH |
276 | } |
277 | ||
220e750f RH |
278 | /* Called for each machine instruction, or relatively atomic group of |
279 | machine instructions (ie built-in macro). The instruction or group | |
280 | is SIZE bytes in length. If dwarf2 line number generation is called | |
281 | for, emit a line statement appropriately. */ | |
353e2c69 | 282 | |
220e750f RH |
283 | void |
284 | dwarf2_emit_insn (size) | |
285 | int size; | |
fac0d250 | 286 | { |
220e750f | 287 | struct dwarf2_line_info loc; |
fac0d250 | 288 | |
b6675117 NC |
289 | if (loc_directive_seen) |
290 | /* Use the last location established by a .loc directive, not | |
291 | the value returned by dwarf2_where(). That calls as_where() | |
292 | which will return either the logical input file name (foo.c) | |
293 | or the physical input file name (foo.s) and not the file name | |
294 | specified in the most recent .loc directive (eg foo.h). */ | |
295 | loc = current; | |
296 | else if (debug_type != DEBUG_DWARF2) | |
220e750f | 297 | return; |
b6675117 NC |
298 | else |
299 | dwarf2_where (& loc); | |
300 | ||
220e750f RH |
301 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
302 | } | |
fac0d250 | 303 | |
220e750f RH |
304 | /* Get a .debug_line file number for FILENAME. */ |
305 | ||
306 | static unsigned int | |
307 | get_filenum (filename) | |
308 | const char *filename; | |
309 | { | |
310 | static unsigned int last_used; | |
311 | unsigned int i; | |
312 | ||
313 | if (last_used) | |
314 | if (strcmp (filename, files[last_used].filename) == 0) | |
315 | return last_used; | |
316 | ||
317 | for (i = 1; i < files_in_use; ++i) | |
318 | if (strcmp (filename, files[i].filename) == 0) | |
319 | return i; | |
320 | ||
321 | if (i >= files_allocated) | |
fac0d250 | 322 | { |
249e3833 RH |
323 | unsigned int old = files_allocated; |
324 | ||
220e750f RH |
325 | files_allocated = i + 32; |
326 | files = (struct file_entry *) | |
ee515fb7 | 327 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
249e3833 RH |
328 | |
329 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
330 | } |
331 | ||
ee515fb7 | 332 | files[i].filename = xstrdup (filename); |
220e750f RH |
333 | files[i].dir = 0; |
334 | files_in_use = i + 1; | |
335 | last_used = i; | |
336 | ||
337 | return i; | |
338 | } | |
fac0d250 | 339 | |
220e750f RH |
340 | /* Handle the .file directive. */ |
341 | ||
342 | void | |
343 | dwarf2_directive_file (dummy) | |
344 | int dummy ATTRIBUTE_UNUSED; | |
345 | { | |
346 | offsetT num; | |
e46d99eb | 347 | char *filename; |
220e750f RH |
348 | int filename_len; |
349 | ||
350 | /* Continue to accept a bare string and pass it off. */ | |
351 | SKIP_WHITESPACE (); | |
352 | if (*input_line_pointer == '"') | |
fac0d250 | 353 | { |
220e750f | 354 | s_app_file (0); |
fac0d250 RH |
355 | return; |
356 | } | |
357 | ||
220e750f RH |
358 | num = get_absolute_expression (); |
359 | filename = demand_copy_C_string (&filename_len); | |
360 | demand_empty_rest_of_line (); | |
361 | ||
249e3833 | 362 | if (num < 1) |
fac0d250 | 363 | { |
0e389e77 | 364 | as_bad (_("file number less than one")); |
fac0d250 RH |
365 | return; |
366 | } | |
367 | ||
0e1a166b | 368 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 369 | { |
0e389e77 | 370 | as_bad (_("file number %ld already allocated"), (long) num); |
249e3833 RH |
371 | return; |
372 | } | |
220e750f | 373 | |
249e3833 RH |
374 | if (num >= (int) files_allocated) |
375 | { | |
376 | unsigned int old = files_allocated; | |
377 | ||
378 | files_allocated = num + 16; | |
379 | files = (struct file_entry *) | |
380 | xrealloc (files, (num + 16) * sizeof (struct file_entry)); | |
fac0d250 | 381 | |
220e750f | 382 | /* Zero the new memory. */ |
249e3833 | 383 | memset (files + old, 0, (num + 16 - old) * sizeof (struct file_entry)); |
220e750f RH |
384 | } |
385 | ||
249e3833 RH |
386 | files[num].filename = filename; |
387 | files[num].dir = 0; | |
388 | files_in_use = num + 1; | |
fac0d250 RH |
389 | } |
390 | ||
220e750f RH |
391 | void |
392 | dwarf2_directive_loc (dummy) | |
393 | int dummy ATTRIBUTE_UNUSED; | |
394 | { | |
395 | offsetT filenum, line, column; | |
396 | ||
397 | filenum = get_absolute_expression (); | |
398 | SKIP_WHITESPACE (); | |
399 | line = get_absolute_expression (); | |
400 | SKIP_WHITESPACE (); | |
401 | column = get_absolute_expression (); | |
402 | demand_empty_rest_of_line (); | |
403 | ||
249e3833 | 404 | if (filenum < 1) |
220e750f | 405 | { |
0e389e77 | 406 | as_bad (_("file number less than one")); |
220e750f RH |
407 | return; |
408 | } | |
249e3833 | 409 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
220e750f | 410 | { |
0e389e77 | 411 | as_bad (_("unassigned file number %ld"), (long) filenum); |
220e750f RH |
412 | return; |
413 | } | |
414 | ||
249e3833 | 415 | current.filenum = filenum; |
220e750f RH |
416 | current.line = line; |
417 | current.column = column; | |
418 | current.flags = DWARF2_FLAG_BEGIN_STMT; | |
419 | ||
420 | loc_directive_seen = true; | |
421 | ||
422 | #ifndef NO_LISTING | |
423 | if (listing) | |
424 | listing_source_line (line); | |
425 | #endif | |
426 | } | |
220e750f RH |
427 | \f |
428 | static struct frag * | |
429 | first_frag_for_seg (seg) | |
430 | segT seg; | |
431 | { | |
432 | frchainS *f, *first = NULL; | |
433 | ||
ee515fb7 | 434 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
435 | if (f->frch_seg == seg |
436 | && (! first || first->frch_subseg > f->frch_subseg)) | |
437 | first = f; | |
438 | ||
439 | return first ? first->frch_root : NULL; | |
440 | } | |
441 | ||
442 | static struct frag * | |
443 | last_frag_for_seg (seg) | |
444 | segT seg; | |
445 | { | |
446 | frchainS *f, *last = NULL; | |
447 | ||
ee515fb7 | 448 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
449 | if (f->frch_seg == seg |
450 | && (! last || last->frch_subseg < f->frch_subseg)) | |
451 | last= f; | |
452 | ||
453 | return last ? last->frch_last : NULL; | |
454 | } | |
455 | \f | |
456 | /* Emit a single byte into the current segment. */ | |
457 | ||
458 | static inline void | |
459 | out_byte (byte) | |
460 | int byte; | |
461 | { | |
462 | FRAG_APPEND_1_CHAR (byte); | |
463 | } | |
464 | ||
465 | /* Emit a statement program opcode into the current segment. */ | |
466 | ||
467 | static inline void | |
468 | out_opcode (opc) | |
469 | int opc; | |
470 | { | |
471 | out_byte (opc); | |
472 | } | |
473 | ||
474 | /* Emit a two-byte word into the current segment. */ | |
475 | ||
476 | static inline void | |
477 | out_two (data) | |
478 | int data; | |
479 | { | |
480 | md_number_to_chars (frag_more (2), data, 2); | |
481 | } | |
482 | ||
483 | /* Emit a four byte word into the current segment. */ | |
484 | ||
485 | static inline void | |
486 | out_four (data) | |
487 | int data; | |
488 | { | |
489 | md_number_to_chars (frag_more (4), data, 4); | |
490 | } | |
491 | ||
492 | /* Emit an unsigned "little-endian base 128" number. */ | |
493 | ||
fac0d250 | 494 | static void |
220e750f RH |
495 | out_uleb128 (value) |
496 | addressT value; | |
497 | { | |
498 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
499 | } | |
500 | ||
501 | /* Emit a tuple for .debug_abbrev. */ | |
502 | ||
503 | static inline void | |
504 | out_abbrev (name, form) | |
505 | int name, form; | |
fac0d250 | 506 | { |
220e750f RH |
507 | out_uleb128 (name); |
508 | out_uleb128 (form); | |
509 | } | |
fac0d250 | 510 | |
220e750f RH |
511 | /* Create a new fake symbol whose value is the current position. */ |
512 | ||
513 | static symbolS * | |
514 | symbol_new_now () | |
515 | { | |
516 | return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); | |
fac0d250 RH |
517 | } |
518 | ||
220e750f | 519 | /* Set the value of SYM to the current position in the current segment. */ |
353e2c69 | 520 | |
fac0d250 | 521 | static void |
220e750f RH |
522 | set_symbol_value_now (sym) |
523 | symbolS *sym; | |
fac0d250 | 524 | { |
220e750f RH |
525 | S_SET_SEGMENT (sym, now_seg); |
526 | S_SET_VALUE (sym, frag_now_fix ()); | |
527 | symbol_set_frag (sym, frag_now); | |
528 | } | |
529 | ||
530 | /* Get the size of a fragment. */ | |
fac0d250 | 531 | |
220e750f RH |
532 | static offsetT |
533 | get_frag_fix (frag) | |
534 | fragS *frag; | |
535 | { | |
536 | frchainS *fr; | |
537 | ||
538 | if (frag->fr_next) | |
539 | return frag->fr_fix; | |
540 | ||
541 | /* If a fragment is the last in the chain, special measures must be | |
542 | taken to find its size before relaxation, since it may be pending | |
543 | on some subsegment chain. */ | |
ee515fb7 | 544 | for (fr = frchain_root; fr; fr = fr->frch_next) |
220e750f RH |
545 | if (fr->frch_last == frag) |
546 | { | |
7c2b59d0 AM |
547 | long align_mask = -1 << get_recorded_alignment (fr->frch_seg); |
548 | return (((char *) obstack_next_free (&fr->frch_obstack) | |
549 | - frag->fr_literal) + ~align_mask) & align_mask; | |
220e750f RH |
550 | } |
551 | ||
552 | abort (); | |
553 | } | |
fac0d250 | 554 | |
220e750f | 555 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 556 | |
220e750f RH |
557 | static void |
558 | out_set_addr (seg, frag, ofs) | |
559 | segT seg; | |
560 | fragS *frag; | |
561 | addressT ofs; | |
562 | { | |
563 | expressionS expr; | |
564 | symbolS *sym; | |
fac0d250 | 565 | |
220e750f | 566 | sym = symbol_new (fake_label_name, seg, ofs, frag); |
9e3af0e7 | 567 | |
fac0d250 | 568 | out_opcode (DW_LNS_extended_op); |
220e750f | 569 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
570 | |
571 | out_opcode (DW_LNE_set_address); | |
572 | expr.X_op = O_symbol; | |
573 | expr.X_add_symbol = sym; | |
574 | expr.X_add_number = 0; | |
220e750f | 575 | emit_expr (&expr, sizeof_address); |
fac0d250 RH |
576 | } |
577 | ||
220e750f RH |
578 | /* Encode a pair of line and address skips as efficiently as possible. |
579 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 580 | |
220e750f RH |
581 | The following two routines *must* be kept in sync. This is |
582 | enforced by making emit_inc_line_addr abort if we do not emit | |
583 | exactly the expected number of bytes. */ | |
584 | ||
585 | static int | |
586 | size_inc_line_addr (line_delta, addr_delta) | |
587 | int line_delta; | |
588 | addressT addr_delta; | |
fac0d250 | 589 | { |
220e750f RH |
590 | unsigned int tmp, opcode; |
591 | int len = 0; | |
fac0d250 | 592 | |
220e750f | 593 | /* Scale the address delta by the minimum instruction length. */ |
ee515fb7 | 594 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
595 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); |
596 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 597 | #endif |
220e750f RH |
598 | |
599 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
600 | We cannot use special opcodes here, since we want the end_sequence | |
601 | to emit the matrix entry. */ | |
602 | if (line_delta == INT_MAX) | |
fac0d250 | 603 | { |
220e750f RH |
604 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
605 | len = 1; | |
fac0d250 | 606 | else |
220e750f RH |
607 | len = 1 + sizeof_leb128 (addr_delta, 0); |
608 | return len + 3; | |
fac0d250 | 609 | } |
fac0d250 | 610 | |
220e750f RH |
611 | /* Bias the line delta by the base. */ |
612 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 613 | |
220e750f RH |
614 | /* If the line increment is out of range of a special opcode, we |
615 | must encode it with DW_LNS_advance_line. */ | |
616 | if (tmp >= DWARF2_LINE_RANGE) | |
617 | { | |
618 | len = 1 + sizeof_leb128 (line_delta, 1); | |
619 | line_delta = 0; | |
620 | tmp = 0 - DWARF2_LINE_BASE; | |
621 | } | |
fac0d250 | 622 | |
220e750f RH |
623 | /* Bias the opcode by the special opcode base. */ |
624 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 625 | |
220e750f RH |
626 | /* Avoid overflow when addr_delta is large. */ |
627 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
628 | { | |
629 | /* Try using a special opcode. */ | |
630 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
631 | if (opcode <= 255) | |
632 | return len + 1; | |
633 | ||
634 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
635 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
636 | if (opcode <= 255) | |
637 | return len + 2; | |
638 | } | |
639 | ||
640 | /* Otherwise use DW_LNS_advance_pc. */ | |
641 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
642 | ||
643 | /* DW_LNS_copy or special opcode. */ | |
644 | len += 1; | |
645 | ||
646 | return len; | |
647 | } | |
fac0d250 | 648 | |
220e750f RH |
649 | static void |
650 | emit_inc_line_addr (line_delta, addr_delta, p, len) | |
651 | int line_delta; | |
652 | addressT addr_delta; | |
653 | char *p; | |
654 | int len; | |
655 | { | |
656 | unsigned int tmp, opcode; | |
657 | int need_copy = 0; | |
658 | char *end = p + len; | |
fac0d250 | 659 | |
ee515fb7 | 660 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
661 | /* Scale the address delta by the minimum instruction length. */ |
662 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); | |
663 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 664 | #endif |
220e750f RH |
665 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
666 | We cannot use special opcodes here, since we want the end_sequence | |
667 | to emit the matrix entry. */ | |
668 | if (line_delta == INT_MAX) | |
fac0d250 | 669 | { |
220e750f RH |
670 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
671 | *p++ = DW_LNS_const_add_pc; | |
672 | else | |
fac0d250 | 673 | { |
220e750f RH |
674 | *p++ = DW_LNS_advance_pc; |
675 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 676 | } |
220e750f RH |
677 | |
678 | *p++ = DW_LNS_extended_op; | |
679 | *p++ = 1; | |
680 | *p++ = DW_LNE_end_sequence; | |
681 | goto done; | |
fac0d250 RH |
682 | } |
683 | ||
220e750f RH |
684 | /* Bias the line delta by the base. */ |
685 | tmp = line_delta - DWARF2_LINE_BASE; | |
686 | ||
687 | /* If the line increment is out of range of a special opcode, we | |
688 | must encode it with DW_LNS_advance_line. */ | |
689 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 690 | { |
220e750f RH |
691 | *p++ = DW_LNS_advance_line; |
692 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 693 | |
220e750f RH |
694 | /* Prettier, I think, to use DW_LNS_copy instead of a |
695 | "line +0, addr +0" special opcode. */ | |
696 | if (addr_delta == 0) | |
697 | { | |
698 | *p++ = DW_LNS_copy; | |
699 | goto done; | |
700 | } | |
cb30237e | 701 | |
220e750f RH |
702 | line_delta = 0; |
703 | tmp = 0 - DWARF2_LINE_BASE; | |
704 | need_copy = 1; | |
705 | } | |
fac0d250 | 706 | |
220e750f RH |
707 | /* Bias the opcode by the special opcode base. */ |
708 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 709 | |
220e750f RH |
710 | /* Avoid overflow when addr_delta is large. */ |
711 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 712 | { |
220e750f RH |
713 | /* Try using a special opcode. */ |
714 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
715 | if (opcode <= 255) | |
716 | { | |
717 | *p++ = opcode; | |
718 | goto done; | |
719 | } | |
720 | ||
721 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
722 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
723 | if (opcode <= 255) | |
fac0d250 | 724 | { |
220e750f RH |
725 | *p++ = DW_LNS_const_add_pc; |
726 | *p++ = opcode; | |
727 | goto done; | |
fac0d250 RH |
728 | } |
729 | } | |
220e750f RH |
730 | |
731 | /* Otherwise use DW_LNS_advance_pc. */ | |
732 | *p++ = DW_LNS_advance_pc; | |
733 | p += output_leb128 (p, addr_delta, 0); | |
734 | ||
735 | if (need_copy) | |
736 | *p++ = DW_LNS_copy; | |
fac0d250 | 737 | else |
220e750f | 738 | *p++ = tmp; |
fac0d250 | 739 | |
220e750f RH |
740 | done: |
741 | assert (p == end); | |
742 | } | |
a8316fe2 | 743 | |
220e750f | 744 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 745 | |
220e750f RH |
746 | static void |
747 | out_inc_line_addr (line_delta, addr_delta) | |
748 | int line_delta; | |
749 | addressT addr_delta; | |
750 | { | |
751 | int len = size_inc_line_addr (line_delta, addr_delta); | |
752 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
753 | } | |
9de8d8f1 | 754 | |
220e750f RH |
755 | /* Generate a variant frag that we can use to relax address/line |
756 | increments between fragments of the target segment. */ | |
9e3af0e7 | 757 | |
220e750f RH |
758 | static void |
759 | relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) | |
760 | int line_delta; | |
761 | segT seg; | |
762 | fragS *to_frag, *from_frag; | |
763 | addressT to_ofs, from_ofs; | |
764 | { | |
765 | symbolS *to_sym, *from_sym; | |
766 | expressionS expr; | |
767 | int max_chars; | |
6576f0b5 | 768 | |
220e750f RH |
769 | to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); |
770 | from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); | |
fac0d250 | 771 | |
220e750f RH |
772 | expr.X_op = O_subtract; |
773 | expr.X_add_symbol = to_sym; | |
774 | expr.X_op_symbol = from_sym; | |
775 | expr.X_add_number = 0; | |
fac0d250 | 776 | |
220e750f RH |
777 | /* The maximum size of the frag is the line delta with a maximum |
778 | sized address delta. */ | |
779 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 780 | |
220e750f RH |
781 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
782 | make_expr_symbol (&expr), line_delta, NULL); | |
783 | } | |
fac0d250 | 784 | |
220e750f RH |
785 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
786 | based on the current values of the symbols. It is called before | |
787 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 788 | |
220e750f RH |
789 | int |
790 | dwarf2dbg_estimate_size_before_relax (frag) | |
791 | fragS *frag; | |
792 | { | |
793 | offsetT addr_delta; | |
794 | int size; | |
fac0d250 | 795 | |
6386f3a7 | 796 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
220e750f | 797 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
fac0d250 | 798 | |
220e750f | 799 | frag->fr_subtype = size; |
fac0d250 | 800 | |
220e750f RH |
801 | return size; |
802 | } | |
803 | ||
804 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
805 | current values of the symbols. fr_subtype is the current length | |
806 | of the frag. This returns the change in frag length. */ | |
807 | ||
808 | int | |
809 | dwarf2dbg_relax_frag (frag) | |
810 | fragS *frag; | |
811 | { | |
812 | int old_size, new_size; | |
fac0d250 | 813 | |
220e750f RH |
814 | old_size = frag->fr_subtype; |
815 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 816 | |
220e750f | 817 | return new_size - old_size; |
fac0d250 RH |
818 | } |
819 | ||
220e750f RH |
820 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
821 | fill frag. This is called after all relaxation has been done. | |
822 | fr_subtype will be the desired length of the frag. */ | |
823 | ||
824 | void | |
825 | dwarf2dbg_convert_frag (frag) | |
826 | fragS *frag; | |
fac0d250 | 827 | { |
220e750f RH |
828 | offsetT addr_diff; |
829 | ||
6386f3a7 | 830 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
fac0d250 | 831 | |
220e750f RH |
832 | /* fr_var carries the max_chars that we created the fragment with. |
833 | fr_subtype carries the current expected length. We must, of | |
834 | course, have allocated enough memory earlier. */ | |
bccba5f0 | 835 | assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 836 | |
ee515fb7 | 837 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
220e750f RH |
838 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
839 | ||
840 | frag->fr_fix += frag->fr_subtype; | |
841 | frag->fr_type = rs_fill; | |
842 | frag->fr_var = 0; | |
843 | frag->fr_offset = 0; | |
844 | } | |
845 | ||
846 | /* Generate .debug_line content for the chain of line number entries | |
847 | beginning at E, for segment SEG. */ | |
848 | ||
849 | static void | |
850 | process_entries (seg, e) | |
851 | segT seg; | |
852 | struct line_entry *e; | |
853 | { | |
854 | unsigned filenum = 1; | |
855 | unsigned line = 1; | |
856 | unsigned column = 0; | |
857 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; | |
858 | fragS *frag = NULL; | |
859 | fragS *last_frag; | |
860 | addressT frag_ofs = 0; | |
861 | addressT last_frag_ofs; | |
862 | struct line_entry *next; | |
863 | ||
864 | while (e) | |
fac0d250 | 865 | { |
220e750f RH |
866 | int changed = 0; |
867 | ||
868 | if (filenum != e->loc.filenum) | |
fac0d250 | 869 | { |
220e750f RH |
870 | filenum = e->loc.filenum; |
871 | out_opcode (DW_LNS_set_file); | |
872 | out_uleb128 (filenum); | |
873 | changed = 1; | |
874 | } | |
875 | ||
876 | if (column != e->loc.column) | |
877 | { | |
878 | column = e->loc.column; | |
879 | out_opcode (DW_LNS_set_column); | |
880 | out_uleb128 (column); | |
881 | changed = 1; | |
882 | } | |
883 | ||
884 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) | |
885 | { | |
886 | flags = e->loc.flags; | |
887 | out_opcode (DW_LNS_negate_stmt); | |
888 | changed = 1; | |
889 | } | |
890 | ||
891 | if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) | |
892 | { | |
893 | out_opcode (DW_LNS_set_basic_block); | |
894 | changed = 1; | |
895 | } | |
896 | ||
fb81275c JM |
897 | /* Don't try to optimize away redundant entries; gdb wants two |
898 | entries for a function where the code starts on the same line as | |
899 | the {, and there's no way to identify that case here. Trust gcc | |
900 | to optimize appropriately. */ | |
901 | if (1 /* line != e->loc.line || changed */) | |
220e750f RH |
902 | { |
903 | int line_delta = e->loc.line - line; | |
904 | if (frag == NULL) | |
fac0d250 | 905 | { |
220e750f RH |
906 | out_set_addr (seg, e->frag, e->frag_ofs); |
907 | out_inc_line_addr (line_delta, 0); | |
fac0d250 | 908 | } |
220e750f RH |
909 | else if (frag == e->frag) |
910 | out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); | |
911 | else | |
912 | relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, | |
913 | frag, frag_ofs); | |
914 | ||
915 | frag = e->frag; | |
916 | frag_ofs = e->frag_ofs; | |
917 | line = e->loc.line; | |
fac0d250 | 918 | } |
220e750f RH |
919 | else if (frag == NULL) |
920 | { | |
921 | out_set_addr (seg, e->frag, e->frag_ofs); | |
922 | frag = e->frag; | |
923 | frag_ofs = e->frag_ofs; | |
924 | } | |
925 | ||
926 | next = e->next; | |
927 | free (e); | |
928 | e = next; | |
fac0d250 | 929 | } |
353e2c69 | 930 | |
220e750f RH |
931 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
932 | last_frag = last_frag_for_seg (seg); | |
933 | last_frag_ofs = get_frag_fix (last_frag); | |
934 | if (frag == last_frag) | |
935 | out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); | |
936 | else | |
ee515fb7 | 937 | relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, |
220e750f | 938 | frag, frag_ofs); |
fac0d250 RH |
939 | } |
940 | ||
220e750f RH |
941 | /* Emit the directory and file tables for .debug_line. */ |
942 | ||
fac0d250 | 943 | static void |
220e750f | 944 | out_file_list () |
fac0d250 RH |
945 | { |
946 | size_t size; | |
947 | char *cp; | |
220e750f RH |
948 | unsigned int i; |
949 | ||
950 | /* Terminate directory list. */ | |
951 | out_byte ('\0'); | |
fac0d250 | 952 | |
220e750f | 953 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 954 | { |
249e3833 RH |
955 | if (files[i].filename == NULL) |
956 | { | |
0e389e77 | 957 | as_bad (_("unassigned file number %ld"), (long) i); |
249e3833 RH |
958 | continue; |
959 | } | |
960 | ||
220e750f | 961 | size = strlen (files[i].filename) + 1; |
fac0d250 | 962 | cp = frag_more (size); |
220e750f | 963 | memcpy (cp, files[i].filename, size); |
fac0d250 | 964 | |
220e750f | 965 | out_uleb128 (files[i].dir); /* directory number */ |
fac0d250 RH |
966 | out_uleb128 (0); /* last modification timestamp */ |
967 | out_uleb128 (0); /* filesize */ | |
968 | } | |
353e2c69 KH |
969 | |
970 | /* Terminate filename list. */ | |
971 | out_byte (0); | |
fac0d250 RH |
972 | } |
973 | ||
220e750f RH |
974 | /* Emit the collected .debug_line data. */ |
975 | ||
976 | static void | |
977 | out_debug_line (line_seg) | |
978 | segT line_seg; | |
979 | { | |
980 | expressionS expr; | |
981 | symbolS *line_start; | |
982 | symbolS *prologue_end; | |
983 | symbolS *line_end; | |
984 | struct line_seg *s; | |
985 | ||
986 | subseg_set (line_seg, 0); | |
987 | ||
988 | line_start = symbol_new_now (); | |
989 | prologue_end = symbol_make (fake_label_name); | |
990 | line_end = symbol_make (fake_label_name); | |
991 | ||
992 | /* Total length of the information for this compilation unit. */ | |
993 | expr.X_op = O_subtract; | |
994 | expr.X_add_symbol = line_end; | |
995 | expr.X_op_symbol = line_start; | |
996 | expr.X_add_number = -4; | |
997 | emit_expr (&expr, 4); | |
998 | ||
999 | /* Version. */ | |
1000 | out_two (2); | |
1001 | ||
1002 | /* Length of the prologue following this length. */ | |
1003 | expr.X_op = O_subtract; | |
1004 | expr.X_add_symbol = prologue_end; | |
1005 | expr.X_op_symbol = line_start; | |
1006 | expr.X_add_number = - (4 + 2 + 4); | |
1007 | emit_expr (&expr, 4); | |
1008 | ||
1009 | /* Parameters of the state machine. */ | |
1010 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1011 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1012 | out_byte (DWARF2_LINE_BASE); | |
1013 | out_byte (DWARF2_LINE_RANGE); | |
1014 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1015 | ||
1016 | /* Standard opcode lengths. */ | |
1017 | out_byte (0); /* DW_LNS_copy */ | |
1018 | out_byte (1); /* DW_LNS_advance_pc */ | |
1019 | out_byte (1); /* DW_LNS_advance_line */ | |
1020 | out_byte (1); /* DW_LNS_set_file */ | |
1021 | out_byte (1); /* DW_LNS_set_column */ | |
1022 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1023 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1024 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1025 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
1026 | ||
1027 | out_file_list (); | |
1028 | ||
1029 | set_symbol_value_now (prologue_end); | |
1030 | ||
1031 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1032 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1033 | process_entries (s->seg, s->head->head); |
1034 | ||
1035 | set_symbol_value_now (line_end); | |
1036 | } | |
1037 | ||
1038 | /* Emit data for .debug_aranges. */ | |
1039 | ||
58b5739a | 1040 | static void |
220e750f RH |
1041 | out_debug_aranges (aranges_seg, info_seg) |
1042 | segT aranges_seg; | |
1043 | segT info_seg; | |
fac0d250 | 1044 | { |
220e750f RH |
1045 | unsigned int addr_size = sizeof_address; |
1046 | addressT size, skip; | |
1047 | struct line_seg *s; | |
1048 | expressionS expr; | |
1049 | char *p; | |
fac0d250 | 1050 | |
220e750f | 1051 | size = 4 + 2 + 4 + 1 + 1; |
fac0d250 | 1052 | |
ee515fb7 KH |
1053 | skip = 2 * addr_size - (size & (2 * addr_size - 1)); |
1054 | if (skip == 2 * addr_size) | |
220e750f RH |
1055 | skip = 0; |
1056 | size += skip; | |
fac0d250 | 1057 | |
ee515fb7 KH |
1058 | for (s = all_segs; s; s = s->next) |
1059 | size += 2 * addr_size; | |
fac0d250 | 1060 | |
ee515fb7 | 1061 | size += 2 * addr_size; |
fac0d250 | 1062 | |
220e750f | 1063 | subseg_set (aranges_seg, 0); |
fac0d250 | 1064 | |
220e750f RH |
1065 | /* Length of the compilation unit. */ |
1066 | out_four (size - 4); | |
fac0d250 | 1067 | |
220e750f RH |
1068 | /* Version. */ |
1069 | out_two (2); | |
4dc7ead9 | 1070 | |
220e750f RH |
1071 | /* Offset to .debug_info. */ |
1072 | expr.X_op = O_symbol; | |
1073 | expr.X_add_symbol = section_symbol (info_seg); | |
1074 | expr.X_add_number = 0; | |
1075 | emit_expr (&expr, 4); | |
1076 | ||
1077 | /* Size of an address (offset portion). */ | |
1078 | out_byte (addr_size); | |
1079 | ||
1080 | /* Size of a segment descriptor. */ | |
1081 | out_byte (0); | |
1082 | ||
1083 | /* Align the header. */ | |
1084 | if (skip) | |
ee515fb7 | 1085 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
4dc7ead9 | 1086 | |
ee515fb7 | 1087 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1088 | { |
1089 | fragS *frag; | |
1090 | symbolS *beg, *end; | |
1091 | ||
1092 | frag = first_frag_for_seg (s->seg); | |
1093 | beg = symbol_new (fake_label_name, s->seg, 0, frag); | |
1094 | s->text_start = beg; | |
1095 | ||
1096 | frag = last_frag_for_seg (s->seg); | |
1097 | end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); | |
1098 | s->text_end = end; | |
1099 | ||
1100 | expr.X_op = O_symbol; | |
1101 | expr.X_add_symbol = beg; | |
1102 | expr.X_add_number = 0; | |
1103 | emit_expr (&expr, addr_size); | |
1104 | ||
1105 | expr.X_op = O_subtract; | |
1106 | expr.X_add_symbol = end; | |
1107 | expr.X_op_symbol = beg; | |
1108 | expr.X_add_number = 0; | |
1109 | emit_expr (&expr, addr_size); | |
1110 | } | |
4dc7ead9 | 1111 | |
220e750f RH |
1112 | p = frag_more (2 * addr_size); |
1113 | md_number_to_chars (p, 0, addr_size); | |
1114 | md_number_to_chars (p + addr_size, 0, addr_size); | |
4dc7ead9 RH |
1115 | } |
1116 | ||
220e750f RH |
1117 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1118 | sync with out_debug_info below. */ | |
fac0d250 | 1119 | |
220e750f RH |
1120 | static void |
1121 | out_debug_abbrev (abbrev_seg) | |
1122 | segT abbrev_seg; | |
1123 | { | |
1124 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1125 | |
220e750f RH |
1126 | out_uleb128 (1); |
1127 | out_uleb128 (DW_TAG_compile_unit); | |
1128 | out_byte (DW_CHILDREN_no); | |
1129 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1130 | if (all_segs->next == NULL) | |
4dc7ead9 | 1131 | { |
220e750f RH |
1132 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
1133 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1134 | } | |
1135 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); | |
1136 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1137 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1138 | out_abbrev (0, 0); | |
a987bfc9 RH |
1139 | |
1140 | /* Terminate the abbreviations for this compilation unit. */ | |
1141 | out_byte (0); | |
220e750f | 1142 | } |
4dc7ead9 | 1143 | |
220e750f | 1144 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1145 | |
220e750f RH |
1146 | static void |
1147 | out_debug_info (info_seg, abbrev_seg, line_seg) | |
1148 | segT info_seg; | |
1149 | segT abbrev_seg; | |
1150 | segT line_seg; | |
1151 | { | |
1152 | char producer[128]; | |
1153 | char *comp_dir; | |
1154 | expressionS expr; | |
1155 | symbolS *info_start; | |
1156 | symbolS *info_end; | |
1157 | char *p; | |
1158 | int len; | |
4dc7ead9 | 1159 | |
220e750f | 1160 | subseg_set (info_seg, 0); |
4dc7ead9 | 1161 | |
ee515fb7 | 1162 | info_start = symbol_new_now (); |
220e750f | 1163 | info_end = symbol_make (fake_label_name); |
4dc7ead9 | 1164 | |
220e750f RH |
1165 | /* Compilation Unit length. */ |
1166 | expr.X_op = O_subtract; | |
1167 | expr.X_add_symbol = info_end; | |
1168 | expr.X_op_symbol = info_start; | |
1169 | expr.X_add_number = -4; | |
1170 | emit_expr (&expr, 4); | |
4dc7ead9 | 1171 | |
220e750f RH |
1172 | /* DWARF version. */ |
1173 | out_two (2); | |
4dc7ead9 | 1174 | |
220e750f RH |
1175 | /* .debug_abbrev offset */ |
1176 | expr.X_op = O_symbol; | |
1177 | expr.X_add_symbol = section_symbol (abbrev_seg); | |
1178 | expr.X_add_number = 0; | |
1179 | emit_expr (&expr, 4); | |
4dc7ead9 | 1180 | |
220e750f RH |
1181 | /* Target address size. */ |
1182 | out_byte (sizeof_address); | |
fac0d250 | 1183 | |
220e750f RH |
1184 | /* DW_TAG_compile_unit DIE abbrev */ |
1185 | out_uleb128 (1); | |
fac0d250 | 1186 | |
220e750f RH |
1187 | /* DW_AT_stmt_list */ |
1188 | expr.X_op = O_symbol; | |
1189 | expr.X_add_symbol = section_symbol (line_seg); | |
1190 | expr.X_add_number = 0; | |
1191 | emit_expr (&expr, 4); | |
fac0d250 | 1192 | |
220e750f RH |
1193 | /* These two attributes may only be emitted if all of the code is |
1194 | contiguous. Multiple sections are not that. */ | |
1195 | if (all_segs->next == NULL) | |
58b5739a | 1196 | { |
220e750f RH |
1197 | /* DW_AT_low_pc */ |
1198 | expr.X_op = O_symbol; | |
1199 | expr.X_add_symbol = all_segs->text_start; | |
1200 | expr.X_add_number = 0; | |
1201 | emit_expr (&expr, sizeof_address); | |
1202 | ||
1203 | /* DW_AT_high_pc */ | |
1204 | expr.X_op = O_symbol; | |
1205 | expr.X_add_symbol = all_segs->text_end; | |
1206 | expr.X_add_number = 0; | |
1207 | emit_expr (&expr, sizeof_address); | |
58b5739a RH |
1208 | } |
1209 | ||
220e750f RH |
1210 | /* DW_AT_comp_dir */ |
1211 | comp_dir = getpwd (); | |
1212 | len = strlen (comp_dir) + 1; | |
1213 | p = frag_more (len); | |
1214 | memcpy (p, comp_dir, len); | |
fac0d250 | 1215 | |
220e750f RH |
1216 | /* DW_AT_producer */ |
1217 | sprintf (producer, "GNU AS %s", VERSION); | |
1218 | len = strlen (producer) + 1; | |
1219 | p = frag_more (len); | |
1220 | memcpy (p, producer, len); | |
fac0d250 | 1221 | |
220e750f RH |
1222 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1223 | dwarf2 draft has no standard code for assembler. */ | |
1224 | out_two (DW_LANG_Mips_Assembler); | |
1225 | ||
1226 | set_symbol_value_now (info_end); | |
fac0d250 RH |
1227 | } |
1228 | ||
1229 | void | |
220e750f | 1230 | dwarf2_finish () |
fac0d250 | 1231 | { |
220e750f RH |
1232 | segT line_seg; |
1233 | struct line_seg *s; | |
fac0d250 | 1234 | |
220e750f | 1235 | /* If no debug information was recorded, nothing to do. */ |
45c500fa | 1236 | if (all_segs == NULL && files_in_use <= 1) |
220e750f | 1237 | return; |
fac0d250 | 1238 | |
220e750f | 1239 | /* Calculate the size of an address for the target machine. */ |
220e750f | 1240 | sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8; |
fac0d250 | 1241 | |
220e750f RH |
1242 | /* Create and switch to the line number section. */ |
1243 | line_seg = subseg_new (".debug_line", 0); | |
220e750f | 1244 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); |
fac0d250 | 1245 | |
220e750f | 1246 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1247 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1248 | { |
220e750f RH |
1249 | struct line_subseg *ss = s->head; |
1250 | struct line_entry **ptail = ss->ptail; | |
1251 | ||
1252 | while ((ss = ss->next) != NULL) | |
1253 | { | |
1254 | *ptail = ss->head; | |
1255 | ptail = ss->ptail; | |
1256 | } | |
fac0d250 | 1257 | } |
85a39694 | 1258 | |
220e750f | 1259 | out_debug_line (line_seg); |
85a39694 | 1260 | |
220e750f RH |
1261 | /* If this is assembler generated line info, we need .debug_info |
1262 | and .debug_abbrev sections as well. */ | |
45c500fa | 1263 | if (all_segs != NULL && debug_type == DEBUG_DWARF2) |
220e750f RH |
1264 | { |
1265 | segT abbrev_seg; | |
1266 | segT info_seg; | |
1267 | segT aranges_seg; | |
4dc7ead9 | 1268 | |
220e750f RH |
1269 | info_seg = subseg_new (".debug_info", 0); |
1270 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1271 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1272 | |
220e750f RH |
1273 | bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); |
1274 | bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); | |
1275 | bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); | |
ef99799a | 1276 | |
ee515fb7 | 1277 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1278 | |
220e750f RH |
1279 | out_debug_aranges (aranges_seg, info_seg); |
1280 | out_debug_abbrev (abbrev_seg); | |
1281 | out_debug_info (info_seg, abbrev_seg, line_seg); | |
1282 | } | |
85a39694 | 1283 | } |
92eb7b32 L |
1284 | |
1285 | #else | |
1286 | void | |
1287 | dwarf2_finish () | |
1288 | { | |
1289 | } | |
1290 | ||
1291 | int | |
1292 | dwarf2dbg_estimate_size_before_relax (frag) | |
1293 | fragS *frag ATTRIBUTE_UNUSED; | |
1294 | { | |
1295 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | int | |
1300 | dwarf2dbg_relax_frag (frag) | |
1301 | fragS *frag ATTRIBUTE_UNUSED; | |
1302 | { | |
1303 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | void | |
1308 | dwarf2dbg_convert_frag (frag) | |
1309 | fragS *frag ATTRIBUTE_UNUSED; | |
1310 | { | |
1311 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1312 | } | |
1313 | ||
1314 | void | |
1315 | dwarf2_emit_insn (size) | |
1316 | int size ATTRIBUTE_UNUSED; | |
1317 | { | |
1318 | } | |
1319 | ||
1320 | void | |
1321 | dwarf2_directive_file (dummy) | |
1322 | int dummy ATTRIBUTE_UNUSED; | |
1323 | { | |
3737d051 | 1324 | s_app_file (0); |
92eb7b32 L |
1325 | } |
1326 | ||
1327 | void | |
1328 | dwarf2_directive_loc (dummy) | |
1329 | int dummy ATTRIBUTE_UNUSED; | |
1330 | { | |
1331 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1332 | } | |
1333 | #endif /* BFD_ASSEMBLER */ |