Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
52454417 | 2 | Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
fac0d250 RH |
3 | Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GAS is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
89b66cde | 20 | 02111-1307, USA. */ |
fac0d250 | 21 | |
89b66cde | 22 | /* Logical line numbers can be controlled by the compiler via the |
fac0d250 RH |
23 | following two directives: |
24 | ||
25 | .file FILENO "file.c" | |
26 | .loc FILENO LINENO [COLUMN] | |
27 | ||
28 | FILENO is the filenumber. */ | |
29 | ||
30 | #include "ansidecl.h" | |
fac0d250 | 31 | #include "as.h" |
92eb7b32 | 32 | |
42dbf88c NC |
33 | #ifdef HAVE_LIMITS_H |
34 | #include <limits.h> | |
35 | #endif | |
36 | ||
92eb7b32 L |
37 | #ifdef BFD_ASSEMBLER |
38 | ||
fac0d250 RH |
39 | #include "dwarf2dbg.h" |
40 | #include "subsegs.h" | |
41 | ||
d9ac5a3b | 42 | #include "elf/dwarf2.h" |
fac0d250 | 43 | |
fac0d250 RH |
44 | /* Since we can't generate the prolog until the body is complete, we |
45 | use three different subsegments for .debug_line: one holding the | |
46 | prolog, one for the directory and filename info, and one for the | |
47 | body ("statement program"). */ | |
48 | #define DL_PROLOG 0 | |
49 | #define DL_FILES 1 | |
50 | #define DL_BODY 2 | |
51 | ||
52 | /* First special line opcde - leave room for the standard opcodes. | |
53 | Note: If you want to change this, you'll have to update the | |
54 | "standard_opcode_lengths" table that is emitted below in | |
55 | dwarf2_finish(). */ | |
56 | #define DWARF2_LINE_OPCODE_BASE 10 | |
57 | ||
58 | #ifndef DWARF2_LINE_BASE | |
59 | /* Minimum line offset in a special line info. opcode. This value | |
60 | was chosen to give a reasonable range of values. */ | |
61 | # define DWARF2_LINE_BASE -5 | |
62 | #endif | |
63 | ||
64 | /* Range of line offsets in a special line info. opcode. */ | |
65 | #ifndef DWARF2_LINE_RANGE | |
66 | # define DWARF2_LINE_RANGE 14 | |
67 | #endif | |
68 | ||
69 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH | |
70 | /* Define the architecture-dependent minimum instruction length (in | |
71 | bytes). This value should be rather too small than too big. */ | |
4dc7ead9 | 72 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
fac0d250 RH |
73 | #endif |
74 | ||
75 | /* Flag that indicates the initial value of the is_stmt_start flag. | |
76 | In the present implementation, we do not mark any lines as | |
77 | the beginning of a source statement, because that information | |
78 | is not made available by the GCC front-end. */ | |
79 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 | |
80 | ||
cb30237e | 81 | /* Given a special op, return the line skip amount. */ |
fac0d250 RH |
82 | #define SPECIAL_LINE(op) \ |
83 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) | |
84 | ||
85 | /* Given a special op, return the address skip amount (in units of | |
86 | DWARF2_LINE_MIN_INSN_LENGTH. */ | |
87 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) | |
88 | ||
cb30237e | 89 | /* The maximum address skip amount that can be encoded with a special op. */ |
fac0d250 RH |
90 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
91 | ||
220e750f RH |
92 | |
93 | struct line_entry | |
94 | { | |
95 | struct line_entry *next; | |
96 | fragS *frag; | |
97 | addressT frag_ofs; | |
98 | struct dwarf2_line_info loc; | |
e6c774b4 | 99 | }; |
fac0d250 | 100 | |
220e750f RH |
101 | struct line_subseg |
102 | { | |
103 | struct line_subseg *next; | |
104 | subsegT subseg; | |
105 | struct line_entry *head; | |
106 | struct line_entry **ptail; | |
107 | }; | |
353e2c69 | 108 | |
220e750f | 109 | struct line_seg |
fac0d250 | 110 | { |
220e750f RH |
111 | struct line_seg *next; |
112 | segT seg; | |
113 | struct line_subseg *head; | |
114 | symbolS *text_start; | |
115 | symbolS *text_end; | |
116 | }; | |
117 | ||
118 | /* Collects data for all line table entries during assembly. */ | |
119 | static struct line_seg *all_segs; | |
120 | ||
121 | struct file_entry | |
122 | { | |
123 | char *filename; | |
124 | unsigned int dir; | |
125 | }; | |
126 | ||
127 | /* Table of files used by .debug_line. */ | |
128 | static struct file_entry *files; | |
129 | static unsigned int files_in_use; | |
130 | static unsigned int files_allocated; | |
131 | ||
132 | /* Correlate file numbers as given by the user in .file/.loc directives | |
133 | with the file numbers used in the output debug info. */ | |
134 | static unsigned int *user_filenum; | |
135 | static unsigned int user_filenum_allocated; | |
136 | ||
137 | /* True when we've seen a .loc directive recently. Used to avoid | |
138 | doing work when there's nothing to do. */ | |
139 | static boolean loc_directive_seen; | |
140 | ||
141 | /* Current location as indicated by the most recent .loc directive. */ | |
142 | static struct dwarf2_line_info current; | |
143 | ||
144 | /* Fake label name. */ | |
145 | static char const fake_label_name[] = ".L0\001"; | |
146 | ||
147 | /* The size of an address on the target. */ | |
148 | static unsigned int sizeof_address; | |
149 | \f | |
150 | static struct line_subseg *get_line_subseg PARAMS ((segT, subsegT)); | |
151 | static unsigned int get_filenum PARAMS ((const char *)); | |
152 | static struct frag *first_frag_for_seg PARAMS ((segT)); | |
153 | static struct frag *last_frag_for_seg PARAMS ((segT)); | |
154 | static void out_byte PARAMS ((int)); | |
155 | static void out_opcode PARAMS ((int)); | |
156 | static void out_two PARAMS ((int)); | |
157 | static void out_four PARAMS ((int)); | |
158 | static void out_abbrev PARAMS ((int, int)); | |
159 | static void out_uleb128 PARAMS ((addressT)); | |
160 | static symbolS *symbol_new_now PARAMS ((void)); | |
161 | static void set_symbol_value_now PARAMS ((symbolS *)); | |
162 | static offsetT get_frag_fix PARAMS ((fragS *)); | |
163 | static void out_set_addr PARAMS ((segT, fragS *, addressT)); | |
164 | static int size_inc_line_addr PARAMS ((int, addressT)); | |
165 | static void emit_inc_line_addr PARAMS ((int, addressT, char *, int)); | |
166 | static void out_inc_line_addr PARAMS ((int, addressT)); | |
167 | static void relax_inc_line_addr PARAMS ((int, segT, fragS *, addressT, | |
168 | fragS *, addressT)); | |
169 | static void process_entries PARAMS ((segT, struct line_entry *)); | |
170 | static void out_file_list PARAMS ((void)); | |
171 | static void out_debug_line PARAMS ((segT)); | |
172 | static void out_debug_aranges PARAMS ((segT, segT)); | |
173 | static void out_debug_abbrev PARAMS ((segT)); | |
174 | static void out_debug_info PARAMS ((segT, segT, segT)); | |
175 | \f | |
176 | /* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ | |
177 | ||
178 | static struct line_subseg * | |
179 | get_line_subseg (seg, subseg) | |
180 | segT seg; | |
181 | subsegT subseg; | |
182 | { | |
183 | static segT last_seg; | |
184 | static subsegT last_subseg; | |
185 | static struct line_subseg *last_line_subseg; | |
186 | ||
187 | struct line_seg *s; | |
188 | struct line_subseg **pss, *ss; | |
fac0d250 | 189 | |
220e750f RH |
190 | if (seg == last_seg && subseg == last_subseg) |
191 | return last_line_subseg; | |
192 | ||
193 | for (s = all_segs; s ; s = s->next) | |
194 | if (s->seg == seg) | |
195 | goto found_seg; | |
196 | ||
197 | s = (struct line_seg *) xmalloc (sizeof (*s)); | |
198 | s->next = all_segs; | |
199 | s->seg = seg; | |
200 | s->head = NULL; | |
201 | all_segs = s; | |
202 | ||
203 | found_seg: | |
204 | for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) | |
fac0d250 | 205 | { |
220e750f RH |
206 | if (ss->subseg == subseg) |
207 | goto found_subseg; | |
208 | if (ss->subseg > subseg) | |
209 | break; | |
fac0d250 | 210 | } |
220e750f RH |
211 | |
212 | ss = (struct line_subseg *) xmalloc (sizeof (*ss)); | |
213 | ss->next = *pss; | |
214 | ss->subseg = subseg; | |
215 | ss->head = NULL; | |
216 | ss->ptail = &ss->head; | |
217 | *pss = ss; | |
218 | ||
219 | found_subseg: | |
220 | last_seg = seg; | |
221 | last_subseg = subseg; | |
222 | last_line_subseg = ss; | |
223 | ||
224 | return ss; | |
fac0d250 RH |
225 | } |
226 | ||
220e750f | 227 | /* Record an entry for LOC ocurring at OFS within the current fragment. */ |
353e2c69 | 228 | |
220e750f RH |
229 | void |
230 | dwarf2_gen_line_info (ofs, loc) | |
231 | addressT ofs; | |
232 | struct dwarf2_line_info *loc; | |
fac0d250 | 233 | { |
220e750f RH |
234 | struct line_subseg *ss; |
235 | struct line_entry *e; | |
236 | ||
237 | /* Early out for as-yet incomplete location information. */ | |
238 | if (loc->filenum == 0 || loc->line == 0) | |
239 | return; | |
240 | ||
241 | e = (struct line_entry *) xmalloc (sizeof (*e)); | |
242 | e->next = NULL; | |
243 | e->frag = frag_now; | |
244 | e->frag_ofs = ofs; | |
245 | e->loc = *loc; | |
246 | ||
247 | ss = get_line_subseg (now_seg, now_subseg); | |
248 | *ss->ptail = e; | |
249 | ss->ptail = &e->next; | |
250 | } | |
fac0d250 | 251 | |
220e750f RH |
252 | void |
253 | dwarf2_where (line) | |
254 | struct dwarf2_line_info *line; | |
255 | { | |
256 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 257 | { |
220e750f RH |
258 | char *filename; |
259 | as_where (&filename, &line->line); | |
260 | line->filenum = get_filenum (filename); | |
261 | line->column = 0; | |
262 | line->flags = DWARF2_FLAG_BEGIN_STMT; | |
fac0d250 | 263 | } |
220e750f RH |
264 | else |
265 | *line = current; | |
fac0d250 RH |
266 | } |
267 | ||
220e750f RH |
268 | /* Called for each machine instruction, or relatively atomic group of |
269 | machine instructions (ie built-in macro). The instruction or group | |
270 | is SIZE bytes in length. If dwarf2 line number generation is called | |
271 | for, emit a line statement appropriately. */ | |
353e2c69 | 272 | |
220e750f RH |
273 | void |
274 | dwarf2_emit_insn (size) | |
275 | int size; | |
fac0d250 | 276 | { |
220e750f | 277 | struct dwarf2_line_info loc; |
fac0d250 | 278 | |
220e750f RH |
279 | if (debug_type != DEBUG_DWARF2 && ! loc_directive_seen) |
280 | return; | |
281 | loc_directive_seen = false; | |
282 | ||
283 | dwarf2_where (&loc); | |
284 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); | |
285 | } | |
fac0d250 | 286 | |
220e750f RH |
287 | /* Get a .debug_line file number for FILENAME. */ |
288 | ||
289 | static unsigned int | |
290 | get_filenum (filename) | |
291 | const char *filename; | |
292 | { | |
293 | static unsigned int last_used; | |
294 | unsigned int i; | |
295 | ||
296 | if (last_used) | |
297 | if (strcmp (filename, files[last_used].filename) == 0) | |
298 | return last_used; | |
299 | ||
300 | for (i = 1; i < files_in_use; ++i) | |
301 | if (strcmp (filename, files[i].filename) == 0) | |
302 | return i; | |
303 | ||
304 | if (i >= files_allocated) | |
fac0d250 | 305 | { |
220e750f RH |
306 | files_allocated = i + 32; |
307 | files = (struct file_entry *) | |
308 | xrealloc (files, (i + 32) * sizeof(struct file_entry)); | |
fac0d250 RH |
309 | } |
310 | ||
220e750f RH |
311 | files[i].filename = xstrdup(filename); |
312 | files[i].dir = 0; | |
313 | files_in_use = i + 1; | |
314 | last_used = i; | |
315 | ||
316 | return i; | |
317 | } | |
fac0d250 | 318 | |
220e750f RH |
319 | /* Handle the .file directive. */ |
320 | ||
321 | void | |
322 | dwarf2_directive_file (dummy) | |
323 | int dummy ATTRIBUTE_UNUSED; | |
324 | { | |
325 | offsetT num; | |
326 | const char *filename; | |
327 | int filename_len; | |
328 | ||
329 | /* Continue to accept a bare string and pass it off. */ | |
330 | SKIP_WHITESPACE (); | |
331 | if (*input_line_pointer == '"') | |
fac0d250 | 332 | { |
220e750f | 333 | s_app_file (0); |
fac0d250 RH |
334 | return; |
335 | } | |
336 | ||
220e750f RH |
337 | num = get_absolute_expression (); |
338 | filename = demand_copy_C_string (&filename_len); | |
339 | demand_empty_rest_of_line (); | |
340 | ||
341 | if (num < 0) | |
fac0d250 | 342 | { |
220e750f | 343 | as_bad (_("File number less than zero")); |
fac0d250 RH |
344 | return; |
345 | } | |
346 | ||
bccba5f0 | 347 | if (num >= (int) user_filenum_allocated) |
220e750f RH |
348 | { |
349 | unsigned int old = user_filenum_allocated; | |
350 | ||
351 | user_filenum_allocated = num + 16; | |
352 | user_filenum = (unsigned int *) | |
353 | xrealloc (user_filenum, (num + 16) * sizeof (unsigned int)); | |
fac0d250 | 354 | |
220e750f RH |
355 | /* Zero the new memory. */ |
356 | memset (user_filenum + old, 0, (num + 16 - old) * sizeof(unsigned int)); | |
357 | } | |
358 | ||
359 | user_filenum[num] = get_filenum (filename); | |
fac0d250 RH |
360 | } |
361 | ||
220e750f RH |
362 | void |
363 | dwarf2_directive_loc (dummy) | |
364 | int dummy ATTRIBUTE_UNUSED; | |
365 | { | |
366 | offsetT filenum, line, column; | |
367 | ||
368 | filenum = get_absolute_expression (); | |
369 | SKIP_WHITESPACE (); | |
370 | line = get_absolute_expression (); | |
371 | SKIP_WHITESPACE (); | |
372 | column = get_absolute_expression (); | |
373 | demand_empty_rest_of_line (); | |
374 | ||
375 | if (filenum < 0) | |
376 | { | |
377 | as_bad (_("File number less than zero")); | |
378 | return; | |
379 | } | |
bccba5f0 | 380 | if (filenum >= (int) user_filenum_allocated |
220e750f RH |
381 | || user_filenum[filenum] == 0) |
382 | { | |
383 | as_bad (_("Unassigned file number %ld"), (long) filenum); | |
384 | return; | |
385 | } | |
386 | ||
387 | current.filenum = user_filenum[filenum]; | |
388 | current.line = line; | |
389 | current.column = column; | |
390 | current.flags = DWARF2_FLAG_BEGIN_STMT; | |
391 | ||
392 | loc_directive_seen = true; | |
393 | ||
394 | #ifndef NO_LISTING | |
395 | if (listing) | |
396 | listing_source_line (line); | |
397 | #endif | |
398 | } | |
399 | ||
400 | \f | |
401 | static struct frag * | |
402 | first_frag_for_seg (seg) | |
403 | segT seg; | |
404 | { | |
405 | frchainS *f, *first = NULL; | |
406 | ||
407 | for (f = frchain_root; f ; f = f->frch_next) | |
408 | if (f->frch_seg == seg | |
409 | && (! first || first->frch_subseg > f->frch_subseg)) | |
410 | first = f; | |
411 | ||
412 | return first ? first->frch_root : NULL; | |
413 | } | |
414 | ||
415 | static struct frag * | |
416 | last_frag_for_seg (seg) | |
417 | segT seg; | |
418 | { | |
419 | frchainS *f, *last = NULL; | |
420 | ||
421 | for (f = frchain_root; f ; f = f->frch_next) | |
422 | if (f->frch_seg == seg | |
423 | && (! last || last->frch_subseg < f->frch_subseg)) | |
424 | last= f; | |
425 | ||
426 | return last ? last->frch_last : NULL; | |
427 | } | |
428 | \f | |
429 | /* Emit a single byte into the current segment. */ | |
430 | ||
431 | static inline void | |
432 | out_byte (byte) | |
433 | int byte; | |
434 | { | |
435 | FRAG_APPEND_1_CHAR (byte); | |
436 | } | |
437 | ||
438 | /* Emit a statement program opcode into the current segment. */ | |
439 | ||
440 | static inline void | |
441 | out_opcode (opc) | |
442 | int opc; | |
443 | { | |
444 | out_byte (opc); | |
445 | } | |
446 | ||
447 | /* Emit a two-byte word into the current segment. */ | |
448 | ||
449 | static inline void | |
450 | out_two (data) | |
451 | int data; | |
452 | { | |
453 | md_number_to_chars (frag_more (2), data, 2); | |
454 | } | |
455 | ||
456 | /* Emit a four byte word into the current segment. */ | |
457 | ||
458 | static inline void | |
459 | out_four (data) | |
460 | int data; | |
461 | { | |
462 | md_number_to_chars (frag_more (4), data, 4); | |
463 | } | |
464 | ||
465 | /* Emit an unsigned "little-endian base 128" number. */ | |
466 | ||
fac0d250 | 467 | static void |
220e750f RH |
468 | out_uleb128 (value) |
469 | addressT value; | |
470 | { | |
471 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
472 | } | |
473 | ||
474 | /* Emit a tuple for .debug_abbrev. */ | |
475 | ||
476 | static inline void | |
477 | out_abbrev (name, form) | |
478 | int name, form; | |
fac0d250 | 479 | { |
220e750f RH |
480 | out_uleb128 (name); |
481 | out_uleb128 (form); | |
482 | } | |
fac0d250 | 483 | |
220e750f RH |
484 | /* Create a new fake symbol whose value is the current position. */ |
485 | ||
486 | static symbolS * | |
487 | symbol_new_now () | |
488 | { | |
489 | return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); | |
fac0d250 RH |
490 | } |
491 | ||
220e750f | 492 | /* Set the value of SYM to the current position in the current segment. */ |
353e2c69 | 493 | |
fac0d250 | 494 | static void |
220e750f RH |
495 | set_symbol_value_now (sym) |
496 | symbolS *sym; | |
fac0d250 | 497 | { |
220e750f RH |
498 | S_SET_SEGMENT (sym, now_seg); |
499 | S_SET_VALUE (sym, frag_now_fix ()); | |
500 | symbol_set_frag (sym, frag_now); | |
501 | } | |
502 | ||
503 | /* Get the size of a fragment. */ | |
fac0d250 | 504 | |
220e750f RH |
505 | static offsetT |
506 | get_frag_fix (frag) | |
507 | fragS *frag; | |
508 | { | |
509 | frchainS *fr; | |
510 | ||
511 | if (frag->fr_next) | |
512 | return frag->fr_fix; | |
513 | ||
514 | /* If a fragment is the last in the chain, special measures must be | |
515 | taken to find its size before relaxation, since it may be pending | |
516 | on some subsegment chain. */ | |
517 | for (fr = frchain_root; fr ; fr = fr->frch_next) | |
518 | if (fr->frch_last == frag) | |
519 | { | |
520 | return ((char *) obstack_next_free (&fr->frch_obstack) | |
521 | - frag->fr_literal); | |
522 | } | |
523 | ||
524 | abort (); | |
525 | } | |
fac0d250 | 526 | |
220e750f | 527 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 528 | |
220e750f RH |
529 | static void |
530 | out_set_addr (seg, frag, ofs) | |
531 | segT seg; | |
532 | fragS *frag; | |
533 | addressT ofs; | |
534 | { | |
535 | expressionS expr; | |
536 | symbolS *sym; | |
fac0d250 | 537 | |
220e750f | 538 | sym = symbol_new (fake_label_name, seg, ofs, frag); |
9e3af0e7 | 539 | |
fac0d250 | 540 | out_opcode (DW_LNS_extended_op); |
220e750f | 541 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
542 | |
543 | out_opcode (DW_LNE_set_address); | |
544 | expr.X_op = O_symbol; | |
545 | expr.X_add_symbol = sym; | |
546 | expr.X_add_number = 0; | |
220e750f | 547 | emit_expr (&expr, sizeof_address); |
fac0d250 RH |
548 | } |
549 | ||
220e750f RH |
550 | /* Encode a pair of line and address skips as efficiently as possible. |
551 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 552 | |
220e750f RH |
553 | The following two routines *must* be kept in sync. This is |
554 | enforced by making emit_inc_line_addr abort if we do not emit | |
555 | exactly the expected number of bytes. */ | |
556 | ||
557 | static int | |
558 | size_inc_line_addr (line_delta, addr_delta) | |
559 | int line_delta; | |
560 | addressT addr_delta; | |
fac0d250 | 561 | { |
220e750f RH |
562 | unsigned int tmp, opcode; |
563 | int len = 0; | |
fac0d250 | 564 | |
220e750f | 565 | /* Scale the address delta by the minimum instruction length. */ |
bccba5f0 | 566 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
567 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); |
568 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 569 | #endif |
220e750f RH |
570 | |
571 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
572 | We cannot use special opcodes here, since we want the end_sequence | |
573 | to emit the matrix entry. */ | |
574 | if (line_delta == INT_MAX) | |
fac0d250 | 575 | { |
220e750f RH |
576 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
577 | len = 1; | |
fac0d250 | 578 | else |
220e750f RH |
579 | len = 1 + sizeof_leb128 (addr_delta, 0); |
580 | return len + 3; | |
fac0d250 | 581 | } |
fac0d250 | 582 | |
220e750f RH |
583 | /* Bias the line delta by the base. */ |
584 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 585 | |
220e750f RH |
586 | /* If the line increment is out of range of a special opcode, we |
587 | must encode it with DW_LNS_advance_line. */ | |
588 | if (tmp >= DWARF2_LINE_RANGE) | |
589 | { | |
590 | len = 1 + sizeof_leb128 (line_delta, 1); | |
591 | line_delta = 0; | |
592 | tmp = 0 - DWARF2_LINE_BASE; | |
593 | } | |
fac0d250 | 594 | |
220e750f RH |
595 | /* Bias the opcode by the special opcode base. */ |
596 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 597 | |
220e750f RH |
598 | /* Avoid overflow when addr_delta is large. */ |
599 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
600 | { | |
601 | /* Try using a special opcode. */ | |
602 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
603 | if (opcode <= 255) | |
604 | return len + 1; | |
605 | ||
606 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
607 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
608 | if (opcode <= 255) | |
609 | return len + 2; | |
610 | } | |
611 | ||
612 | /* Otherwise use DW_LNS_advance_pc. */ | |
613 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
614 | ||
615 | /* DW_LNS_copy or special opcode. */ | |
616 | len += 1; | |
617 | ||
618 | return len; | |
619 | } | |
fac0d250 | 620 | |
220e750f RH |
621 | static void |
622 | emit_inc_line_addr (line_delta, addr_delta, p, len) | |
623 | int line_delta; | |
624 | addressT addr_delta; | |
625 | char *p; | |
626 | int len; | |
627 | { | |
628 | unsigned int tmp, opcode; | |
629 | int need_copy = 0; | |
630 | char *end = p + len; | |
fac0d250 | 631 | |
bccba5f0 | 632 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
633 | /* Scale the address delta by the minimum instruction length. */ |
634 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); | |
635 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 636 | #endif |
220e750f RH |
637 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
638 | We cannot use special opcodes here, since we want the end_sequence | |
639 | to emit the matrix entry. */ | |
640 | if (line_delta == INT_MAX) | |
fac0d250 | 641 | { |
220e750f RH |
642 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
643 | *p++ = DW_LNS_const_add_pc; | |
644 | else | |
fac0d250 | 645 | { |
220e750f RH |
646 | *p++ = DW_LNS_advance_pc; |
647 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 648 | } |
220e750f RH |
649 | |
650 | *p++ = DW_LNS_extended_op; | |
651 | *p++ = 1; | |
652 | *p++ = DW_LNE_end_sequence; | |
653 | goto done; | |
fac0d250 RH |
654 | } |
655 | ||
220e750f RH |
656 | /* Bias the line delta by the base. */ |
657 | tmp = line_delta - DWARF2_LINE_BASE; | |
658 | ||
659 | /* If the line increment is out of range of a special opcode, we | |
660 | must encode it with DW_LNS_advance_line. */ | |
661 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 662 | { |
220e750f RH |
663 | *p++ = DW_LNS_advance_line; |
664 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 665 | |
220e750f RH |
666 | /* Prettier, I think, to use DW_LNS_copy instead of a |
667 | "line +0, addr +0" special opcode. */ | |
668 | if (addr_delta == 0) | |
669 | { | |
670 | *p++ = DW_LNS_copy; | |
671 | goto done; | |
672 | } | |
cb30237e | 673 | |
220e750f RH |
674 | line_delta = 0; |
675 | tmp = 0 - DWARF2_LINE_BASE; | |
676 | need_copy = 1; | |
677 | } | |
fac0d250 | 678 | |
220e750f RH |
679 | /* Bias the opcode by the special opcode base. */ |
680 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 681 | |
220e750f RH |
682 | /* Avoid overflow when addr_delta is large. */ |
683 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 684 | { |
220e750f RH |
685 | /* Try using a special opcode. */ |
686 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
687 | if (opcode <= 255) | |
688 | { | |
689 | *p++ = opcode; | |
690 | goto done; | |
691 | } | |
692 | ||
693 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
694 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
695 | if (opcode <= 255) | |
fac0d250 | 696 | { |
220e750f RH |
697 | *p++ = DW_LNS_const_add_pc; |
698 | *p++ = opcode; | |
699 | goto done; | |
fac0d250 RH |
700 | } |
701 | } | |
220e750f RH |
702 | |
703 | /* Otherwise use DW_LNS_advance_pc. */ | |
704 | *p++ = DW_LNS_advance_pc; | |
705 | p += output_leb128 (p, addr_delta, 0); | |
706 | ||
707 | if (need_copy) | |
708 | *p++ = DW_LNS_copy; | |
fac0d250 | 709 | else |
220e750f | 710 | *p++ = tmp; |
fac0d250 | 711 | |
220e750f RH |
712 | done: |
713 | assert (p == end); | |
714 | } | |
a8316fe2 | 715 | |
220e750f | 716 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 717 | |
220e750f RH |
718 | static void |
719 | out_inc_line_addr (line_delta, addr_delta) | |
720 | int line_delta; | |
721 | addressT addr_delta; | |
722 | { | |
723 | int len = size_inc_line_addr (line_delta, addr_delta); | |
724 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
725 | } | |
9de8d8f1 | 726 | |
220e750f RH |
727 | /* Generate a variant frag that we can use to relax address/line |
728 | increments between fragments of the target segment. */ | |
9e3af0e7 | 729 | |
220e750f RH |
730 | static void |
731 | relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) | |
732 | int line_delta; | |
733 | segT seg; | |
734 | fragS *to_frag, *from_frag; | |
735 | addressT to_ofs, from_ofs; | |
736 | { | |
737 | symbolS *to_sym, *from_sym; | |
738 | expressionS expr; | |
739 | int max_chars; | |
6576f0b5 | 740 | |
220e750f RH |
741 | to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); |
742 | from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); | |
fac0d250 | 743 | |
220e750f RH |
744 | expr.X_op = O_subtract; |
745 | expr.X_add_symbol = to_sym; | |
746 | expr.X_op_symbol = from_sym; | |
747 | expr.X_add_number = 0; | |
fac0d250 | 748 | |
220e750f RH |
749 | /* The maximum size of the frag is the line delta with a maximum |
750 | sized address delta. */ | |
751 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 752 | |
220e750f RH |
753 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
754 | make_expr_symbol (&expr), line_delta, NULL); | |
755 | } | |
fac0d250 | 756 | |
220e750f RH |
757 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
758 | based on the current values of the symbols. It is called before | |
759 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 760 | |
220e750f RH |
761 | int |
762 | dwarf2dbg_estimate_size_before_relax (frag) | |
763 | fragS *frag; | |
764 | { | |
765 | offsetT addr_delta; | |
766 | int size; | |
fac0d250 | 767 | |
220e750f RH |
768 | addr_delta = resolve_symbol_value (frag->fr_symbol, 0); |
769 | size = size_inc_line_addr (frag->fr_offset, addr_delta); | |
fac0d250 | 770 | |
220e750f | 771 | frag->fr_subtype = size; |
fac0d250 | 772 | |
220e750f RH |
773 | return size; |
774 | } | |
775 | ||
776 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
777 | current values of the symbols. fr_subtype is the current length | |
778 | of the frag. This returns the change in frag length. */ | |
779 | ||
780 | int | |
781 | dwarf2dbg_relax_frag (frag) | |
782 | fragS *frag; | |
783 | { | |
784 | int old_size, new_size; | |
fac0d250 | 785 | |
220e750f RH |
786 | old_size = frag->fr_subtype; |
787 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
788 | ||
789 | return new_size - old_size; | |
fac0d250 RH |
790 | } |
791 | ||
220e750f RH |
792 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
793 | fill frag. This is called after all relaxation has been done. | |
794 | fr_subtype will be the desired length of the frag. */ | |
795 | ||
796 | void | |
797 | dwarf2dbg_convert_frag (frag) | |
798 | fragS *frag; | |
fac0d250 | 799 | { |
220e750f RH |
800 | offsetT addr_diff; |
801 | ||
802 | addr_diff = resolve_symbol_value (frag->fr_symbol, 1); | |
fac0d250 | 803 | |
220e750f RH |
804 | /* fr_var carries the max_chars that we created the fragment with. |
805 | fr_subtype carries the current expected length. We must, of | |
806 | course, have allocated enough memory earlier. */ | |
bccba5f0 | 807 | assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 808 | |
220e750f RH |
809 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
810 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); | |
811 | ||
812 | frag->fr_fix += frag->fr_subtype; | |
813 | frag->fr_type = rs_fill; | |
814 | frag->fr_var = 0; | |
815 | frag->fr_offset = 0; | |
816 | } | |
817 | ||
818 | /* Generate .debug_line content for the chain of line number entries | |
819 | beginning at E, for segment SEG. */ | |
820 | ||
821 | static void | |
822 | process_entries (seg, e) | |
823 | segT seg; | |
824 | struct line_entry *e; | |
825 | { | |
826 | unsigned filenum = 1; | |
827 | unsigned line = 1; | |
828 | unsigned column = 0; | |
829 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; | |
830 | fragS *frag = NULL; | |
831 | fragS *last_frag; | |
832 | addressT frag_ofs = 0; | |
833 | addressT last_frag_ofs; | |
834 | struct line_entry *next; | |
835 | ||
836 | while (e) | |
fac0d250 | 837 | { |
220e750f RH |
838 | int changed = 0; |
839 | ||
840 | if (filenum != e->loc.filenum) | |
fac0d250 | 841 | { |
220e750f RH |
842 | filenum = e->loc.filenum; |
843 | out_opcode (DW_LNS_set_file); | |
844 | out_uleb128 (filenum); | |
845 | changed = 1; | |
846 | } | |
847 | ||
848 | if (column != e->loc.column) | |
849 | { | |
850 | column = e->loc.column; | |
851 | out_opcode (DW_LNS_set_column); | |
852 | out_uleb128 (column); | |
853 | changed = 1; | |
854 | } | |
855 | ||
856 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) | |
857 | { | |
858 | flags = e->loc.flags; | |
859 | out_opcode (DW_LNS_negate_stmt); | |
860 | changed = 1; | |
861 | } | |
862 | ||
863 | if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) | |
864 | { | |
865 | out_opcode (DW_LNS_set_basic_block); | |
866 | changed = 1; | |
867 | } | |
868 | ||
869 | if (line != e->loc.line || changed) | |
870 | { | |
871 | int line_delta = e->loc.line - line; | |
872 | if (frag == NULL) | |
fac0d250 | 873 | { |
220e750f RH |
874 | out_set_addr (seg, e->frag, e->frag_ofs); |
875 | out_inc_line_addr (line_delta, 0); | |
fac0d250 | 876 | } |
220e750f RH |
877 | else if (frag == e->frag) |
878 | out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); | |
879 | else | |
880 | relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, | |
881 | frag, frag_ofs); | |
882 | ||
883 | frag = e->frag; | |
884 | frag_ofs = e->frag_ofs; | |
885 | line = e->loc.line; | |
fac0d250 | 886 | } |
220e750f RH |
887 | else if (frag == NULL) |
888 | { | |
889 | out_set_addr (seg, e->frag, e->frag_ofs); | |
890 | frag = e->frag; | |
891 | frag_ofs = e->frag_ofs; | |
892 | } | |
893 | ||
894 | next = e->next; | |
895 | free (e); | |
896 | e = next; | |
fac0d250 | 897 | } |
353e2c69 | 898 | |
220e750f RH |
899 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
900 | last_frag = last_frag_for_seg (seg); | |
901 | last_frag_ofs = get_frag_fix (last_frag); | |
902 | if (frag == last_frag) | |
903 | out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); | |
904 | else | |
905 | relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, | |
906 | frag, frag_ofs); | |
fac0d250 RH |
907 | } |
908 | ||
220e750f RH |
909 | /* Emit the directory and file tables for .debug_line. */ |
910 | ||
fac0d250 | 911 | static void |
220e750f | 912 | out_file_list () |
fac0d250 RH |
913 | { |
914 | size_t size; | |
915 | char *cp; | |
220e750f RH |
916 | unsigned int i; |
917 | ||
918 | /* Terminate directory list. */ | |
919 | out_byte ('\0'); | |
fac0d250 | 920 | |
220e750f | 921 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 922 | { |
220e750f | 923 | size = strlen (files[i].filename) + 1; |
fac0d250 | 924 | cp = frag_more (size); |
220e750f | 925 | memcpy (cp, files[i].filename, size); |
fac0d250 | 926 | |
220e750f | 927 | out_uleb128 (files[i].dir); /* directory number */ |
fac0d250 RH |
928 | out_uleb128 (0); /* last modification timestamp */ |
929 | out_uleb128 (0); /* filesize */ | |
930 | } | |
353e2c69 KH |
931 | |
932 | /* Terminate filename list. */ | |
933 | out_byte (0); | |
fac0d250 RH |
934 | } |
935 | ||
220e750f RH |
936 | /* Emit the collected .debug_line data. */ |
937 | ||
938 | static void | |
939 | out_debug_line (line_seg) | |
940 | segT line_seg; | |
941 | { | |
942 | expressionS expr; | |
943 | symbolS *line_start; | |
944 | symbolS *prologue_end; | |
945 | symbolS *line_end; | |
946 | struct line_seg *s; | |
947 | ||
948 | subseg_set (line_seg, 0); | |
949 | ||
950 | line_start = symbol_new_now (); | |
951 | prologue_end = symbol_make (fake_label_name); | |
952 | line_end = symbol_make (fake_label_name); | |
953 | ||
954 | /* Total length of the information for this compilation unit. */ | |
955 | expr.X_op = O_subtract; | |
956 | expr.X_add_symbol = line_end; | |
957 | expr.X_op_symbol = line_start; | |
958 | expr.X_add_number = -4; | |
959 | emit_expr (&expr, 4); | |
960 | ||
961 | /* Version. */ | |
962 | out_two (2); | |
963 | ||
964 | /* Length of the prologue following this length. */ | |
965 | expr.X_op = O_subtract; | |
966 | expr.X_add_symbol = prologue_end; | |
967 | expr.X_op_symbol = line_start; | |
968 | expr.X_add_number = - (4 + 2 + 4); | |
969 | emit_expr (&expr, 4); | |
970 | ||
971 | /* Parameters of the state machine. */ | |
972 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
973 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
974 | out_byte (DWARF2_LINE_BASE); | |
975 | out_byte (DWARF2_LINE_RANGE); | |
976 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
977 | ||
978 | /* Standard opcode lengths. */ | |
979 | out_byte (0); /* DW_LNS_copy */ | |
980 | out_byte (1); /* DW_LNS_advance_pc */ | |
981 | out_byte (1); /* DW_LNS_advance_line */ | |
982 | out_byte (1); /* DW_LNS_set_file */ | |
983 | out_byte (1); /* DW_LNS_set_column */ | |
984 | out_byte (0); /* DW_LNS_negate_stmt */ | |
985 | out_byte (0); /* DW_LNS_set_basic_block */ | |
986 | out_byte (0); /* DW_LNS_const_add_pc */ | |
987 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
988 | ||
989 | out_file_list (); | |
990 | ||
991 | set_symbol_value_now (prologue_end); | |
992 | ||
993 | /* For each section, emit a statement program. */ | |
994 | for (s = all_segs; s ; s = s->next) | |
995 | process_entries (s->seg, s->head->head); | |
996 | ||
997 | set_symbol_value_now (line_end); | |
998 | } | |
999 | ||
1000 | /* Emit data for .debug_aranges. */ | |
1001 | ||
58b5739a | 1002 | static void |
220e750f RH |
1003 | out_debug_aranges (aranges_seg, info_seg) |
1004 | segT aranges_seg; | |
1005 | segT info_seg; | |
fac0d250 | 1006 | { |
220e750f RH |
1007 | unsigned int addr_size = sizeof_address; |
1008 | addressT size, skip; | |
1009 | struct line_seg *s; | |
1010 | expressionS expr; | |
1011 | char *p; | |
fac0d250 | 1012 | |
220e750f | 1013 | size = 4 + 2 + 4 + 1 + 1; |
fac0d250 | 1014 | |
220e750f RH |
1015 | skip = 2*addr_size - (size & (2*addr_size - 1)); |
1016 | if (skip == 2*addr_size) | |
1017 | skip = 0; | |
1018 | size += skip; | |
fac0d250 | 1019 | |
220e750f RH |
1020 | for (s = all_segs; s ; s = s->next) |
1021 | size += 2*addr_size; | |
fac0d250 | 1022 | |
220e750f | 1023 | size += 2*addr_size; |
fac0d250 | 1024 | |
220e750f | 1025 | subseg_set (aranges_seg, 0); |
fac0d250 | 1026 | |
220e750f RH |
1027 | /* Length of the compilation unit. */ |
1028 | out_four (size - 4); | |
fac0d250 | 1029 | |
220e750f RH |
1030 | /* Version. */ |
1031 | out_two (2); | |
4dc7ead9 | 1032 | |
220e750f RH |
1033 | /* Offset to .debug_info. */ |
1034 | expr.X_op = O_symbol; | |
1035 | expr.X_add_symbol = section_symbol (info_seg); | |
1036 | expr.X_add_number = 0; | |
1037 | emit_expr (&expr, 4); | |
1038 | ||
1039 | /* Size of an address (offset portion). */ | |
1040 | out_byte (addr_size); | |
1041 | ||
1042 | /* Size of a segment descriptor. */ | |
1043 | out_byte (0); | |
1044 | ||
1045 | /* Align the header. */ | |
1046 | if (skip) | |
1047 | frag_align (ffs (2*addr_size) - 1, 0, 0); | |
4dc7ead9 | 1048 | |
220e750f RH |
1049 | for (s = all_segs; s ; s = s->next) |
1050 | { | |
1051 | fragS *frag; | |
1052 | symbolS *beg, *end; | |
1053 | ||
1054 | frag = first_frag_for_seg (s->seg); | |
1055 | beg = symbol_new (fake_label_name, s->seg, 0, frag); | |
1056 | s->text_start = beg; | |
1057 | ||
1058 | frag = last_frag_for_seg (s->seg); | |
1059 | end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); | |
1060 | s->text_end = end; | |
1061 | ||
1062 | expr.X_op = O_symbol; | |
1063 | expr.X_add_symbol = beg; | |
1064 | expr.X_add_number = 0; | |
1065 | emit_expr (&expr, addr_size); | |
1066 | ||
1067 | expr.X_op = O_subtract; | |
1068 | expr.X_add_symbol = end; | |
1069 | expr.X_op_symbol = beg; | |
1070 | expr.X_add_number = 0; | |
1071 | emit_expr (&expr, addr_size); | |
1072 | } | |
4dc7ead9 | 1073 | |
220e750f RH |
1074 | p = frag_more (2 * addr_size); |
1075 | md_number_to_chars (p, 0, addr_size); | |
1076 | md_number_to_chars (p + addr_size, 0, addr_size); | |
4dc7ead9 RH |
1077 | } |
1078 | ||
220e750f RH |
1079 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1080 | sync with out_debug_info below. */ | |
fac0d250 | 1081 | |
220e750f RH |
1082 | static void |
1083 | out_debug_abbrev (abbrev_seg) | |
1084 | segT abbrev_seg; | |
1085 | { | |
1086 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1087 | |
220e750f RH |
1088 | out_uleb128 (1); |
1089 | out_uleb128 (DW_TAG_compile_unit); | |
1090 | out_byte (DW_CHILDREN_no); | |
1091 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1092 | if (all_segs->next == NULL) | |
4dc7ead9 | 1093 | { |
220e750f RH |
1094 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
1095 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1096 | } | |
1097 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); | |
1098 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1099 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1100 | out_abbrev (0, 0); | |
1101 | } | |
4dc7ead9 | 1102 | |
220e750f | 1103 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1104 | |
220e750f RH |
1105 | static void |
1106 | out_debug_info (info_seg, abbrev_seg, line_seg) | |
1107 | segT info_seg; | |
1108 | segT abbrev_seg; | |
1109 | segT line_seg; | |
1110 | { | |
1111 | char producer[128]; | |
1112 | char *comp_dir; | |
1113 | expressionS expr; | |
1114 | symbolS *info_start; | |
1115 | symbolS *info_end; | |
1116 | char *p; | |
1117 | int len; | |
4dc7ead9 | 1118 | |
220e750f | 1119 | subseg_set (info_seg, 0); |
4dc7ead9 | 1120 | |
220e750f RH |
1121 | info_start = symbol_new_now(); |
1122 | info_end = symbol_make (fake_label_name); | |
4dc7ead9 | 1123 | |
220e750f RH |
1124 | /* Compilation Unit length. */ |
1125 | expr.X_op = O_subtract; | |
1126 | expr.X_add_symbol = info_end; | |
1127 | expr.X_op_symbol = info_start; | |
1128 | expr.X_add_number = -4; | |
1129 | emit_expr (&expr, 4); | |
4dc7ead9 | 1130 | |
220e750f RH |
1131 | /* DWARF version. */ |
1132 | out_two (2); | |
4dc7ead9 | 1133 | |
220e750f RH |
1134 | /* .debug_abbrev offset */ |
1135 | expr.X_op = O_symbol; | |
1136 | expr.X_add_symbol = section_symbol (abbrev_seg); | |
1137 | expr.X_add_number = 0; | |
1138 | emit_expr (&expr, 4); | |
4dc7ead9 | 1139 | |
220e750f RH |
1140 | /* Target address size. */ |
1141 | out_byte (sizeof_address); | |
fac0d250 | 1142 | |
220e750f RH |
1143 | /* DW_TAG_compile_unit DIE abbrev */ |
1144 | out_uleb128 (1); | |
fac0d250 | 1145 | |
220e750f RH |
1146 | /* DW_AT_stmt_list */ |
1147 | expr.X_op = O_symbol; | |
1148 | expr.X_add_symbol = section_symbol (line_seg); | |
1149 | expr.X_add_number = 0; | |
1150 | emit_expr (&expr, 4); | |
fac0d250 | 1151 | |
220e750f RH |
1152 | /* These two attributes may only be emitted if all of the code is |
1153 | contiguous. Multiple sections are not that. */ | |
1154 | if (all_segs->next == NULL) | |
58b5739a | 1155 | { |
220e750f RH |
1156 | /* DW_AT_low_pc */ |
1157 | expr.X_op = O_symbol; | |
1158 | expr.X_add_symbol = all_segs->text_start; | |
1159 | expr.X_add_number = 0; | |
1160 | emit_expr (&expr, sizeof_address); | |
1161 | ||
1162 | /* DW_AT_high_pc */ | |
1163 | expr.X_op = O_symbol; | |
1164 | expr.X_add_symbol = all_segs->text_end; | |
1165 | expr.X_add_number = 0; | |
1166 | emit_expr (&expr, sizeof_address); | |
58b5739a RH |
1167 | } |
1168 | ||
220e750f RH |
1169 | /* DW_AT_comp_dir */ |
1170 | comp_dir = getpwd (); | |
1171 | len = strlen (comp_dir) + 1; | |
1172 | p = frag_more (len); | |
1173 | memcpy (p, comp_dir, len); | |
fac0d250 | 1174 | |
220e750f RH |
1175 | /* DW_AT_producer */ |
1176 | sprintf (producer, "GNU AS %s", VERSION); | |
1177 | len = strlen (producer) + 1; | |
1178 | p = frag_more (len); | |
1179 | memcpy (p, producer, len); | |
fac0d250 | 1180 | |
220e750f RH |
1181 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1182 | dwarf2 draft has no standard code for assembler. */ | |
1183 | out_two (DW_LANG_Mips_Assembler); | |
1184 | ||
1185 | set_symbol_value_now (info_end); | |
fac0d250 RH |
1186 | } |
1187 | ||
1188 | void | |
220e750f | 1189 | dwarf2_finish () |
fac0d250 | 1190 | { |
220e750f RH |
1191 | segT line_seg; |
1192 | struct line_seg *s; | |
fac0d250 | 1193 | |
220e750f RH |
1194 | /* If no debug information was recorded, nothing to do. */ |
1195 | if (all_segs == NULL) | |
1196 | return; | |
fac0d250 | 1197 | |
220e750f RH |
1198 | /* Calculate the size of an address for the target machine. */ |
1199 | #ifdef BFD_ASSEMBLER | |
1200 | sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8; | |
1201 | #else | |
1202 | /* FIXME. */ | |
1203 | sizeof_address = 4; | |
1204 | #endif | |
fac0d250 | 1205 | |
220e750f RH |
1206 | /* Create and switch to the line number section. */ |
1207 | line_seg = subseg_new (".debug_line", 0); | |
1208 | #ifdef BFD_ASSEMBLER | |
1209 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); | |
fac0d250 | 1210 | #endif |
fac0d250 | 1211 | |
220e750f RH |
1212 | /* For each subsection, chain the debug entries together. */ |
1213 | for (s = all_segs; s ; s = s->next) | |
fac0d250 | 1214 | { |
220e750f RH |
1215 | struct line_subseg *ss = s->head; |
1216 | struct line_entry **ptail = ss->ptail; | |
1217 | ||
1218 | while ((ss = ss->next) != NULL) | |
1219 | { | |
1220 | *ptail = ss->head; | |
1221 | ptail = ss->ptail; | |
1222 | } | |
fac0d250 | 1223 | } |
85a39694 | 1224 | |
220e750f | 1225 | out_debug_line (line_seg); |
85a39694 | 1226 | |
220e750f RH |
1227 | /* If this is assembler generated line info, we need .debug_info |
1228 | and .debug_abbrev sections as well. */ | |
1229 | if (debug_type == DEBUG_DWARF2) | |
1230 | { | |
1231 | segT abbrev_seg; | |
1232 | segT info_seg; | |
1233 | segT aranges_seg; | |
4dc7ead9 | 1234 | |
220e750f RH |
1235 | info_seg = subseg_new (".debug_info", 0); |
1236 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1237 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1238 | |
220e750f RH |
1239 | #ifdef BFD_ASSEMBLER |
1240 | bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); | |
1241 | bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); | |
1242 | bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); | |
1243 | #endif | |
ef99799a | 1244 | |
220e750f | 1245 | record_alignment (aranges_seg, ffs (2*sizeof_address) - 1); |
ef99799a | 1246 | |
220e750f RH |
1247 | out_debug_aranges (aranges_seg, info_seg); |
1248 | out_debug_abbrev (abbrev_seg); | |
1249 | out_debug_info (info_seg, abbrev_seg, line_seg); | |
1250 | } | |
85a39694 | 1251 | } |
92eb7b32 L |
1252 | |
1253 | #else | |
1254 | void | |
1255 | dwarf2_finish () | |
1256 | { | |
1257 | } | |
1258 | ||
1259 | int | |
1260 | dwarf2dbg_estimate_size_before_relax (frag) | |
1261 | fragS *frag ATTRIBUTE_UNUSED; | |
1262 | { | |
1263 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | int | |
1268 | dwarf2dbg_relax_frag (frag) | |
1269 | fragS *frag ATTRIBUTE_UNUSED; | |
1270 | { | |
1271 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | void | |
1276 | dwarf2dbg_convert_frag (frag) | |
1277 | fragS *frag ATTRIBUTE_UNUSED; | |
1278 | { | |
1279 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1280 | } | |
1281 | ||
1282 | void | |
1283 | dwarf2_emit_insn (size) | |
1284 | int size ATTRIBUTE_UNUSED; | |
1285 | { | |
1286 | } | |
1287 | ||
1288 | void | |
1289 | dwarf2_directive_file (dummy) | |
1290 | int dummy ATTRIBUTE_UNUSED; | |
1291 | { | |
1292 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1293 | } | |
1294 | ||
1295 | void | |
1296 | dwarf2_directive_loc (dummy) | |
1297 | int dummy ATTRIBUTE_UNUSED; | |
1298 | { | |
1299 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1300 | } | |
1301 | #endif /* BFD_ASSEMBLER */ |