Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
f7e42eb4 | 2 | Copyright 1999, 2000, 2001 Free Software Foundation, Inc. |
fac0d250 RH |
3 | Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GAS is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
89b66cde | 20 | 02111-1307, USA. */ |
fac0d250 | 21 | |
89b66cde | 22 | /* Logical line numbers can be controlled by the compiler via the |
fac0d250 RH |
23 | following two directives: |
24 | ||
25 | .file FILENO "file.c" | |
26 | .loc FILENO LINENO [COLUMN] | |
27 | ||
28 | FILENO is the filenumber. */ | |
29 | ||
30 | #include "ansidecl.h" | |
fac0d250 | 31 | #include "as.h" |
92eb7b32 | 32 | |
42dbf88c NC |
33 | #ifdef HAVE_LIMITS_H |
34 | #include <limits.h> | |
92625c16 | 35 | #else |
6717891c NC |
36 | #ifdef HAVE_SYS_PARAM_H |
37 | #include <sys/param.h> | |
38 | #endif | |
6256f9dd | 39 | #ifndef INT_MAX |
ee515fb7 | 40 | #define INT_MAX (int) (((unsigned) (-1)) >> 1) |
42dbf88c | 41 | #endif |
b8f080d6 | 42 | #endif |
42dbf88c | 43 | |
92eb7b32 L |
44 | #ifdef BFD_ASSEMBLER |
45 | ||
fac0d250 RH |
46 | #include "dwarf2dbg.h" |
47 | #include "subsegs.h" | |
48 | ||
d9ac5a3b | 49 | #include "elf/dwarf2.h" |
fac0d250 | 50 | |
fac0d250 RH |
51 | /* Since we can't generate the prolog until the body is complete, we |
52 | use three different subsegments for .debug_line: one holding the | |
53 | prolog, one for the directory and filename info, and one for the | |
54 | body ("statement program"). */ | |
55 | #define DL_PROLOG 0 | |
56 | #define DL_FILES 1 | |
57 | #define DL_BODY 2 | |
58 | ||
59 | /* First special line opcde - leave room for the standard opcodes. | |
60 | Note: If you want to change this, you'll have to update the | |
61 | "standard_opcode_lengths" table that is emitted below in | |
62 | dwarf2_finish(). */ | |
63 | #define DWARF2_LINE_OPCODE_BASE 10 | |
64 | ||
65 | #ifndef DWARF2_LINE_BASE | |
66 | /* Minimum line offset in a special line info. opcode. This value | |
67 | was chosen to give a reasonable range of values. */ | |
68 | # define DWARF2_LINE_BASE -5 | |
69 | #endif | |
70 | ||
71 | /* Range of line offsets in a special line info. opcode. */ | |
72 | #ifndef DWARF2_LINE_RANGE | |
73 | # define DWARF2_LINE_RANGE 14 | |
74 | #endif | |
75 | ||
76 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH | |
77 | /* Define the architecture-dependent minimum instruction length (in | |
78 | bytes). This value should be rather too small than too big. */ | |
4dc7ead9 | 79 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
fac0d250 RH |
80 | #endif |
81 | ||
82 | /* Flag that indicates the initial value of the is_stmt_start flag. | |
83 | In the present implementation, we do not mark any lines as | |
84 | the beginning of a source statement, because that information | |
85 | is not made available by the GCC front-end. */ | |
86 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 | |
87 | ||
cb30237e | 88 | /* Given a special op, return the line skip amount. */ |
fac0d250 RH |
89 | #define SPECIAL_LINE(op) \ |
90 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) | |
91 | ||
92 | /* Given a special op, return the address skip amount (in units of | |
93 | DWARF2_LINE_MIN_INSN_LENGTH. */ | |
94 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) | |
95 | ||
cb30237e | 96 | /* The maximum address skip amount that can be encoded with a special op. */ |
fac0d250 RH |
97 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
98 | ||
ee515fb7 | 99 | struct line_entry { |
220e750f RH |
100 | struct line_entry *next; |
101 | fragS *frag; | |
102 | addressT frag_ofs; | |
103 | struct dwarf2_line_info loc; | |
e6c774b4 | 104 | }; |
fac0d250 | 105 | |
ee515fb7 | 106 | struct line_subseg { |
220e750f RH |
107 | struct line_subseg *next; |
108 | subsegT subseg; | |
109 | struct line_entry *head; | |
110 | struct line_entry **ptail; | |
111 | }; | |
353e2c69 | 112 | |
ee515fb7 | 113 | struct line_seg { |
220e750f RH |
114 | struct line_seg *next; |
115 | segT seg; | |
116 | struct line_subseg *head; | |
117 | symbolS *text_start; | |
118 | symbolS *text_end; | |
119 | }; | |
120 | ||
121 | /* Collects data for all line table entries during assembly. */ | |
122 | static struct line_seg *all_segs; | |
123 | ||
ee515fb7 | 124 | struct file_entry { |
220e750f RH |
125 | char *filename; |
126 | unsigned int dir; | |
127 | }; | |
128 | ||
129 | /* Table of files used by .debug_line. */ | |
130 | static struct file_entry *files; | |
131 | static unsigned int files_in_use; | |
132 | static unsigned int files_allocated; | |
133 | ||
220e750f RH |
134 | /* True when we've seen a .loc directive recently. Used to avoid |
135 | doing work when there's nothing to do. */ | |
136 | static boolean loc_directive_seen; | |
137 | ||
138 | /* Current location as indicated by the most recent .loc directive. */ | |
139 | static struct dwarf2_line_info current; | |
140 | ||
141 | /* Fake label name. */ | |
142 | static char const fake_label_name[] = ".L0\001"; | |
143 | ||
144 | /* The size of an address on the target. */ | |
145 | static unsigned int sizeof_address; | |
146 | \f | |
147 | static struct line_subseg *get_line_subseg PARAMS ((segT, subsegT)); | |
148 | static unsigned int get_filenum PARAMS ((const char *)); | |
149 | static struct frag *first_frag_for_seg PARAMS ((segT)); | |
150 | static struct frag *last_frag_for_seg PARAMS ((segT)); | |
151 | static void out_byte PARAMS ((int)); | |
152 | static void out_opcode PARAMS ((int)); | |
153 | static void out_two PARAMS ((int)); | |
154 | static void out_four PARAMS ((int)); | |
155 | static void out_abbrev PARAMS ((int, int)); | |
156 | static void out_uleb128 PARAMS ((addressT)); | |
157 | static symbolS *symbol_new_now PARAMS ((void)); | |
158 | static void set_symbol_value_now PARAMS ((symbolS *)); | |
159 | static offsetT get_frag_fix PARAMS ((fragS *)); | |
160 | static void out_set_addr PARAMS ((segT, fragS *, addressT)); | |
161 | static int size_inc_line_addr PARAMS ((int, addressT)); | |
162 | static void emit_inc_line_addr PARAMS ((int, addressT, char *, int)); | |
163 | static void out_inc_line_addr PARAMS ((int, addressT)); | |
164 | static void relax_inc_line_addr PARAMS ((int, segT, fragS *, addressT, | |
165 | fragS *, addressT)); | |
166 | static void process_entries PARAMS ((segT, struct line_entry *)); | |
167 | static void out_file_list PARAMS ((void)); | |
168 | static void out_debug_line PARAMS ((segT)); | |
169 | static void out_debug_aranges PARAMS ((segT, segT)); | |
170 | static void out_debug_abbrev PARAMS ((segT)); | |
171 | static void out_debug_info PARAMS ((segT, segT, segT)); | |
172 | \f | |
173 | /* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ | |
174 | ||
175 | static struct line_subseg * | |
176 | get_line_subseg (seg, subseg) | |
177 | segT seg; | |
178 | subsegT subseg; | |
179 | { | |
180 | static segT last_seg; | |
181 | static subsegT last_subseg; | |
182 | static struct line_subseg *last_line_subseg; | |
183 | ||
184 | struct line_seg *s; | |
185 | struct line_subseg **pss, *ss; | |
fac0d250 | 186 | |
220e750f RH |
187 | if (seg == last_seg && subseg == last_subseg) |
188 | return last_line_subseg; | |
189 | ||
ee515fb7 | 190 | for (s = all_segs; s; s = s->next) |
220e750f RH |
191 | if (s->seg == seg) |
192 | goto found_seg; | |
193 | ||
194 | s = (struct line_seg *) xmalloc (sizeof (*s)); | |
195 | s->next = all_segs; | |
196 | s->seg = seg; | |
197 | s->head = NULL; | |
198 | all_segs = s; | |
199 | ||
200 | found_seg: | |
201 | for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) | |
fac0d250 | 202 | { |
220e750f | 203 | if (ss->subseg == subseg) |
ee515fb7 | 204 | goto found_subseg; |
220e750f RH |
205 | if (ss->subseg > subseg) |
206 | break; | |
fac0d250 | 207 | } |
220e750f RH |
208 | |
209 | ss = (struct line_subseg *) xmalloc (sizeof (*ss)); | |
210 | ss->next = *pss; | |
211 | ss->subseg = subseg; | |
212 | ss->head = NULL; | |
213 | ss->ptail = &ss->head; | |
214 | *pss = ss; | |
215 | ||
216 | found_subseg: | |
217 | last_seg = seg; | |
218 | last_subseg = subseg; | |
219 | last_line_subseg = ss; | |
220 | ||
221 | return ss; | |
fac0d250 RH |
222 | } |
223 | ||
220e750f | 224 | /* Record an entry for LOC ocurring at OFS within the current fragment. */ |
353e2c69 | 225 | |
220e750f RH |
226 | void |
227 | dwarf2_gen_line_info (ofs, loc) | |
228 | addressT ofs; | |
229 | struct dwarf2_line_info *loc; | |
fac0d250 | 230 | { |
220e750f RH |
231 | struct line_subseg *ss; |
232 | struct line_entry *e; | |
1ea5c325 MS |
233 | static unsigned int line = -1; |
234 | static unsigned int filenum = -1; | |
220e750f RH |
235 | |
236 | /* Early out for as-yet incomplete location information. */ | |
237 | if (loc->filenum == 0 || loc->line == 0) | |
238 | return; | |
239 | ||
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 | 289 | if (loc_directive_seen) |
1080e97d L |
290 | { |
291 | /* Use the last location established by a .loc directive, not | |
292 | the value returned by dwarf2_where(). That calls as_where() | |
293 | which will return either the logical input file name (foo.c) | |
294 | or the physical input file name (foo.s) and not the file name | |
295 | specified in the most recent .loc directive (eg foo.h). */ | |
296 | loc = current; | |
297 | ||
298 | /* Unless we generate DWARF2 debugging information for each | |
299 | assembler line, we only emit one line symbol for one LOC. */ | |
300 | if (debug_type != DEBUG_DWARF2) | |
301 | loc_directive_seen = false; | |
302 | } | |
b6675117 | 303 | else if (debug_type != DEBUG_DWARF2) |
220e750f | 304 | return; |
b6675117 NC |
305 | else |
306 | dwarf2_where (& loc); | |
307 | ||
220e750f RH |
308 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
309 | } | |
fac0d250 | 310 | |
220e750f RH |
311 | /* Get a .debug_line file number for FILENAME. */ |
312 | ||
313 | static unsigned int | |
314 | get_filenum (filename) | |
315 | const char *filename; | |
316 | { | |
317 | static unsigned int last_used; | |
318 | unsigned int i; | |
319 | ||
320 | if (last_used) | |
321 | if (strcmp (filename, files[last_used].filename) == 0) | |
322 | return last_used; | |
323 | ||
324 | for (i = 1; i < files_in_use; ++i) | |
325 | if (strcmp (filename, files[i].filename) == 0) | |
326 | return i; | |
327 | ||
328 | if (i >= files_allocated) | |
fac0d250 | 329 | { |
249e3833 RH |
330 | unsigned int old = files_allocated; |
331 | ||
220e750f RH |
332 | files_allocated = i + 32; |
333 | files = (struct file_entry *) | |
ee515fb7 | 334 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
249e3833 RH |
335 | |
336 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
337 | } |
338 | ||
ee515fb7 | 339 | files[i].filename = xstrdup (filename); |
220e750f RH |
340 | files[i].dir = 0; |
341 | files_in_use = i + 1; | |
342 | last_used = i; | |
343 | ||
344 | return i; | |
345 | } | |
fac0d250 | 346 | |
220e750f RH |
347 | /* Handle the .file directive. */ |
348 | ||
349 | void | |
350 | dwarf2_directive_file (dummy) | |
351 | int dummy ATTRIBUTE_UNUSED; | |
352 | { | |
353 | offsetT num; | |
e46d99eb | 354 | char *filename; |
220e750f RH |
355 | int filename_len; |
356 | ||
357 | /* Continue to accept a bare string and pass it off. */ | |
358 | SKIP_WHITESPACE (); | |
359 | if (*input_line_pointer == '"') | |
fac0d250 | 360 | { |
220e750f | 361 | s_app_file (0); |
fac0d250 RH |
362 | return; |
363 | } | |
364 | ||
220e750f RH |
365 | num = get_absolute_expression (); |
366 | filename = demand_copy_C_string (&filename_len); | |
367 | demand_empty_rest_of_line (); | |
368 | ||
249e3833 | 369 | if (num < 1) |
fac0d250 | 370 | { |
0e389e77 | 371 | as_bad (_("file number less than one")); |
fac0d250 RH |
372 | return; |
373 | } | |
374 | ||
0e1a166b | 375 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 376 | { |
0e389e77 | 377 | as_bad (_("file number %ld already allocated"), (long) num); |
249e3833 RH |
378 | return; |
379 | } | |
220e750f | 380 | |
249e3833 RH |
381 | if (num >= (int) files_allocated) |
382 | { | |
383 | unsigned int old = files_allocated; | |
384 | ||
385 | files_allocated = num + 16; | |
386 | files = (struct file_entry *) | |
387 | xrealloc (files, (num + 16) * sizeof (struct file_entry)); | |
fac0d250 | 388 | |
220e750f | 389 | /* Zero the new memory. */ |
249e3833 | 390 | memset (files + old, 0, (num + 16 - old) * sizeof (struct file_entry)); |
220e750f RH |
391 | } |
392 | ||
249e3833 RH |
393 | files[num].filename = filename; |
394 | files[num].dir = 0; | |
395 | files_in_use = num + 1; | |
fac0d250 RH |
396 | } |
397 | ||
220e750f RH |
398 | void |
399 | dwarf2_directive_loc (dummy) | |
400 | int dummy ATTRIBUTE_UNUSED; | |
401 | { | |
402 | offsetT filenum, line, column; | |
403 | ||
404 | filenum = get_absolute_expression (); | |
405 | SKIP_WHITESPACE (); | |
406 | line = get_absolute_expression (); | |
407 | SKIP_WHITESPACE (); | |
408 | column = get_absolute_expression (); | |
409 | demand_empty_rest_of_line (); | |
410 | ||
249e3833 | 411 | if (filenum < 1) |
220e750f | 412 | { |
0e389e77 | 413 | as_bad (_("file number less than one")); |
220e750f RH |
414 | return; |
415 | } | |
249e3833 | 416 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
220e750f | 417 | { |
0e389e77 | 418 | as_bad (_("unassigned file number %ld"), (long) filenum); |
220e750f RH |
419 | return; |
420 | } | |
421 | ||
249e3833 | 422 | current.filenum = filenum; |
220e750f RH |
423 | current.line = line; |
424 | current.column = column; | |
425 | current.flags = DWARF2_FLAG_BEGIN_STMT; | |
426 | ||
427 | loc_directive_seen = true; | |
428 | ||
429 | #ifndef NO_LISTING | |
430 | if (listing) | |
9d66a1d9 L |
431 | { |
432 | listing_source_file (files[filenum].filename); | |
433 | listing_source_line (line); | |
434 | } | |
220e750f RH |
435 | #endif |
436 | } | |
220e750f RH |
437 | \f |
438 | static struct frag * | |
439 | first_frag_for_seg (seg) | |
440 | segT seg; | |
441 | { | |
442 | frchainS *f, *first = NULL; | |
443 | ||
ee515fb7 | 444 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
445 | if (f->frch_seg == seg |
446 | && (! first || first->frch_subseg > f->frch_subseg)) | |
447 | first = f; | |
448 | ||
449 | return first ? first->frch_root : NULL; | |
450 | } | |
451 | ||
452 | static struct frag * | |
453 | last_frag_for_seg (seg) | |
454 | segT seg; | |
455 | { | |
456 | frchainS *f, *last = NULL; | |
457 | ||
ee515fb7 | 458 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
459 | if (f->frch_seg == seg |
460 | && (! last || last->frch_subseg < f->frch_subseg)) | |
461 | last= f; | |
462 | ||
463 | return last ? last->frch_last : NULL; | |
464 | } | |
465 | \f | |
466 | /* Emit a single byte into the current segment. */ | |
467 | ||
468 | static inline void | |
469 | out_byte (byte) | |
470 | int byte; | |
471 | { | |
472 | FRAG_APPEND_1_CHAR (byte); | |
473 | } | |
474 | ||
475 | /* Emit a statement program opcode into the current segment. */ | |
476 | ||
477 | static inline void | |
478 | out_opcode (opc) | |
479 | int opc; | |
480 | { | |
481 | out_byte (opc); | |
482 | } | |
483 | ||
484 | /* Emit a two-byte word into the current segment. */ | |
485 | ||
486 | static inline void | |
487 | out_two (data) | |
488 | int data; | |
489 | { | |
490 | md_number_to_chars (frag_more (2), data, 2); | |
491 | } | |
492 | ||
493 | /* Emit a four byte word into the current segment. */ | |
494 | ||
495 | static inline void | |
496 | out_four (data) | |
497 | int data; | |
498 | { | |
499 | md_number_to_chars (frag_more (4), data, 4); | |
500 | } | |
501 | ||
502 | /* Emit an unsigned "little-endian base 128" number. */ | |
503 | ||
fac0d250 | 504 | static void |
220e750f RH |
505 | out_uleb128 (value) |
506 | addressT value; | |
507 | { | |
508 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
509 | } | |
510 | ||
511 | /* Emit a tuple for .debug_abbrev. */ | |
512 | ||
513 | static inline void | |
514 | out_abbrev (name, form) | |
515 | int name, form; | |
fac0d250 | 516 | { |
220e750f RH |
517 | out_uleb128 (name); |
518 | out_uleb128 (form); | |
519 | } | |
fac0d250 | 520 | |
220e750f RH |
521 | /* Create a new fake symbol whose value is the current position. */ |
522 | ||
523 | static symbolS * | |
524 | symbol_new_now () | |
525 | { | |
526 | return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); | |
fac0d250 RH |
527 | } |
528 | ||
220e750f | 529 | /* Set the value of SYM to the current position in the current segment. */ |
353e2c69 | 530 | |
fac0d250 | 531 | static void |
220e750f RH |
532 | set_symbol_value_now (sym) |
533 | symbolS *sym; | |
fac0d250 | 534 | { |
220e750f RH |
535 | S_SET_SEGMENT (sym, now_seg); |
536 | S_SET_VALUE (sym, frag_now_fix ()); | |
537 | symbol_set_frag (sym, frag_now); | |
538 | } | |
539 | ||
540 | /* Get the size of a fragment. */ | |
fac0d250 | 541 | |
220e750f RH |
542 | static offsetT |
543 | get_frag_fix (frag) | |
544 | fragS *frag; | |
545 | { | |
546 | frchainS *fr; | |
547 | ||
548 | if (frag->fr_next) | |
549 | return frag->fr_fix; | |
550 | ||
551 | /* If a fragment is the last in the chain, special measures must be | |
552 | taken to find its size before relaxation, since it may be pending | |
553 | on some subsegment chain. */ | |
ee515fb7 | 554 | for (fr = frchain_root; fr; fr = fr->frch_next) |
220e750f RH |
555 | if (fr->frch_last == frag) |
556 | { | |
7c2b59d0 AM |
557 | long align_mask = -1 << get_recorded_alignment (fr->frch_seg); |
558 | return (((char *) obstack_next_free (&fr->frch_obstack) | |
559 | - frag->fr_literal) + ~align_mask) & align_mask; | |
220e750f RH |
560 | } |
561 | ||
562 | abort (); | |
563 | } | |
fac0d250 | 564 | |
220e750f | 565 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 566 | |
220e750f RH |
567 | static void |
568 | out_set_addr (seg, frag, ofs) | |
569 | segT seg; | |
570 | fragS *frag; | |
571 | addressT ofs; | |
572 | { | |
573 | expressionS expr; | |
574 | symbolS *sym; | |
fac0d250 | 575 | |
220e750f | 576 | sym = symbol_new (fake_label_name, seg, ofs, frag); |
9e3af0e7 | 577 | |
fac0d250 | 578 | out_opcode (DW_LNS_extended_op); |
220e750f | 579 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
580 | |
581 | out_opcode (DW_LNE_set_address); | |
582 | expr.X_op = O_symbol; | |
583 | expr.X_add_symbol = sym; | |
584 | expr.X_add_number = 0; | |
220e750f | 585 | emit_expr (&expr, sizeof_address); |
fac0d250 RH |
586 | } |
587 | ||
220e750f RH |
588 | /* Encode a pair of line and address skips as efficiently as possible. |
589 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 590 | |
220e750f RH |
591 | The following two routines *must* be kept in sync. This is |
592 | enforced by making emit_inc_line_addr abort if we do not emit | |
593 | exactly the expected number of bytes. */ | |
594 | ||
595 | static int | |
596 | size_inc_line_addr (line_delta, addr_delta) | |
597 | int line_delta; | |
598 | addressT addr_delta; | |
fac0d250 | 599 | { |
220e750f RH |
600 | unsigned int tmp, opcode; |
601 | int len = 0; | |
fac0d250 | 602 | |
220e750f | 603 | /* Scale the address delta by the minimum instruction length. */ |
ee515fb7 | 604 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
605 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); |
606 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 607 | #endif |
220e750f RH |
608 | |
609 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
610 | We cannot use special opcodes here, since we want the end_sequence | |
611 | to emit the matrix entry. */ | |
612 | if (line_delta == INT_MAX) | |
fac0d250 | 613 | { |
220e750f RH |
614 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
615 | len = 1; | |
fac0d250 | 616 | else |
220e750f RH |
617 | len = 1 + sizeof_leb128 (addr_delta, 0); |
618 | return len + 3; | |
fac0d250 | 619 | } |
fac0d250 | 620 | |
220e750f RH |
621 | /* Bias the line delta by the base. */ |
622 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 623 | |
220e750f RH |
624 | /* If the line increment is out of range of a special opcode, we |
625 | must encode it with DW_LNS_advance_line. */ | |
626 | if (tmp >= DWARF2_LINE_RANGE) | |
627 | { | |
628 | len = 1 + sizeof_leb128 (line_delta, 1); | |
629 | line_delta = 0; | |
630 | tmp = 0 - DWARF2_LINE_BASE; | |
631 | } | |
fac0d250 | 632 | |
220e750f RH |
633 | /* Bias the opcode by the special opcode base. */ |
634 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 635 | |
220e750f RH |
636 | /* Avoid overflow when addr_delta is large. */ |
637 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
638 | { | |
639 | /* Try using a special opcode. */ | |
640 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
641 | if (opcode <= 255) | |
642 | return len + 1; | |
643 | ||
644 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
645 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
646 | if (opcode <= 255) | |
647 | return len + 2; | |
648 | } | |
649 | ||
650 | /* Otherwise use DW_LNS_advance_pc. */ | |
651 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
652 | ||
653 | /* DW_LNS_copy or special opcode. */ | |
654 | len += 1; | |
655 | ||
656 | return len; | |
657 | } | |
fac0d250 | 658 | |
220e750f RH |
659 | static void |
660 | emit_inc_line_addr (line_delta, addr_delta, p, len) | |
661 | int line_delta; | |
662 | addressT addr_delta; | |
663 | char *p; | |
664 | int len; | |
665 | { | |
666 | unsigned int tmp, opcode; | |
667 | int need_copy = 0; | |
668 | char *end = p + len; | |
fac0d250 | 669 | |
ee515fb7 | 670 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
671 | /* Scale the address delta by the minimum instruction length. */ |
672 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); | |
673 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 674 | #endif |
220e750f RH |
675 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
676 | We cannot use special opcodes here, since we want the end_sequence | |
677 | to emit the matrix entry. */ | |
678 | if (line_delta == INT_MAX) | |
fac0d250 | 679 | { |
220e750f RH |
680 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
681 | *p++ = DW_LNS_const_add_pc; | |
682 | else | |
fac0d250 | 683 | { |
220e750f RH |
684 | *p++ = DW_LNS_advance_pc; |
685 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 686 | } |
220e750f RH |
687 | |
688 | *p++ = DW_LNS_extended_op; | |
689 | *p++ = 1; | |
690 | *p++ = DW_LNE_end_sequence; | |
691 | goto done; | |
fac0d250 RH |
692 | } |
693 | ||
220e750f RH |
694 | /* Bias the line delta by the base. */ |
695 | tmp = line_delta - DWARF2_LINE_BASE; | |
696 | ||
697 | /* If the line increment is out of range of a special opcode, we | |
698 | must encode it with DW_LNS_advance_line. */ | |
699 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 700 | { |
220e750f RH |
701 | *p++ = DW_LNS_advance_line; |
702 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 703 | |
220e750f RH |
704 | /* Prettier, I think, to use DW_LNS_copy instead of a |
705 | "line +0, addr +0" special opcode. */ | |
706 | if (addr_delta == 0) | |
707 | { | |
708 | *p++ = DW_LNS_copy; | |
709 | goto done; | |
710 | } | |
cb30237e | 711 | |
220e750f RH |
712 | line_delta = 0; |
713 | tmp = 0 - DWARF2_LINE_BASE; | |
714 | need_copy = 1; | |
715 | } | |
fac0d250 | 716 | |
220e750f RH |
717 | /* Bias the opcode by the special opcode base. */ |
718 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 719 | |
220e750f RH |
720 | /* Avoid overflow when addr_delta is large. */ |
721 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 722 | { |
220e750f RH |
723 | /* Try using a special opcode. */ |
724 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
725 | if (opcode <= 255) | |
726 | { | |
727 | *p++ = opcode; | |
728 | goto done; | |
729 | } | |
730 | ||
731 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
732 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
733 | if (opcode <= 255) | |
fac0d250 | 734 | { |
220e750f RH |
735 | *p++ = DW_LNS_const_add_pc; |
736 | *p++ = opcode; | |
737 | goto done; | |
fac0d250 RH |
738 | } |
739 | } | |
220e750f RH |
740 | |
741 | /* Otherwise use DW_LNS_advance_pc. */ | |
742 | *p++ = DW_LNS_advance_pc; | |
743 | p += output_leb128 (p, addr_delta, 0); | |
744 | ||
745 | if (need_copy) | |
746 | *p++ = DW_LNS_copy; | |
fac0d250 | 747 | else |
220e750f | 748 | *p++ = tmp; |
fac0d250 | 749 | |
220e750f RH |
750 | done: |
751 | assert (p == end); | |
752 | } | |
a8316fe2 | 753 | |
220e750f | 754 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 755 | |
220e750f RH |
756 | static void |
757 | out_inc_line_addr (line_delta, addr_delta) | |
758 | int line_delta; | |
759 | addressT addr_delta; | |
760 | { | |
761 | int len = size_inc_line_addr (line_delta, addr_delta); | |
762 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
763 | } | |
9de8d8f1 | 764 | |
220e750f RH |
765 | /* Generate a variant frag that we can use to relax address/line |
766 | increments between fragments of the target segment. */ | |
9e3af0e7 | 767 | |
220e750f RH |
768 | static void |
769 | relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) | |
770 | int line_delta; | |
771 | segT seg; | |
772 | fragS *to_frag, *from_frag; | |
773 | addressT to_ofs, from_ofs; | |
774 | { | |
775 | symbolS *to_sym, *from_sym; | |
776 | expressionS expr; | |
777 | int max_chars; | |
6576f0b5 | 778 | |
220e750f RH |
779 | to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); |
780 | from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); | |
fac0d250 | 781 | |
220e750f RH |
782 | expr.X_op = O_subtract; |
783 | expr.X_add_symbol = to_sym; | |
784 | expr.X_op_symbol = from_sym; | |
785 | expr.X_add_number = 0; | |
fac0d250 | 786 | |
220e750f RH |
787 | /* The maximum size of the frag is the line delta with a maximum |
788 | sized address delta. */ | |
789 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 790 | |
220e750f RH |
791 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
792 | make_expr_symbol (&expr), line_delta, NULL); | |
793 | } | |
fac0d250 | 794 | |
220e750f RH |
795 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
796 | based on the current values of the symbols. It is called before | |
797 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 798 | |
220e750f RH |
799 | int |
800 | dwarf2dbg_estimate_size_before_relax (frag) | |
801 | fragS *frag; | |
802 | { | |
803 | offsetT addr_delta; | |
804 | int size; | |
fac0d250 | 805 | |
6386f3a7 | 806 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
220e750f | 807 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
fac0d250 | 808 | |
220e750f | 809 | frag->fr_subtype = size; |
fac0d250 | 810 | |
220e750f RH |
811 | return size; |
812 | } | |
813 | ||
814 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
815 | current values of the symbols. fr_subtype is the current length | |
816 | of the frag. This returns the change in frag length. */ | |
817 | ||
818 | int | |
819 | dwarf2dbg_relax_frag (frag) | |
820 | fragS *frag; | |
821 | { | |
822 | int old_size, new_size; | |
fac0d250 | 823 | |
220e750f RH |
824 | old_size = frag->fr_subtype; |
825 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 826 | |
220e750f | 827 | return new_size - old_size; |
fac0d250 RH |
828 | } |
829 | ||
220e750f RH |
830 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
831 | fill frag. This is called after all relaxation has been done. | |
832 | fr_subtype will be the desired length of the frag. */ | |
833 | ||
834 | void | |
835 | dwarf2dbg_convert_frag (frag) | |
836 | fragS *frag; | |
fac0d250 | 837 | { |
220e750f RH |
838 | offsetT addr_diff; |
839 | ||
6386f3a7 | 840 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
fac0d250 | 841 | |
220e750f RH |
842 | /* fr_var carries the max_chars that we created the fragment with. |
843 | fr_subtype carries the current expected length. We must, of | |
844 | course, have allocated enough memory earlier. */ | |
bccba5f0 | 845 | assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 846 | |
ee515fb7 | 847 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
220e750f RH |
848 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
849 | ||
850 | frag->fr_fix += frag->fr_subtype; | |
851 | frag->fr_type = rs_fill; | |
852 | frag->fr_var = 0; | |
853 | frag->fr_offset = 0; | |
854 | } | |
855 | ||
856 | /* Generate .debug_line content for the chain of line number entries | |
857 | beginning at E, for segment SEG. */ | |
858 | ||
859 | static void | |
860 | process_entries (seg, e) | |
861 | segT seg; | |
862 | struct line_entry *e; | |
863 | { | |
864 | unsigned filenum = 1; | |
865 | unsigned line = 1; | |
866 | unsigned column = 0; | |
867 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; | |
868 | fragS *frag = NULL; | |
869 | fragS *last_frag; | |
870 | addressT frag_ofs = 0; | |
871 | addressT last_frag_ofs; | |
872 | struct line_entry *next; | |
873 | ||
874 | while (e) | |
fac0d250 | 875 | { |
220e750f RH |
876 | int changed = 0; |
877 | ||
878 | if (filenum != e->loc.filenum) | |
fac0d250 | 879 | { |
220e750f RH |
880 | filenum = e->loc.filenum; |
881 | out_opcode (DW_LNS_set_file); | |
882 | out_uleb128 (filenum); | |
883 | changed = 1; | |
884 | } | |
885 | ||
886 | if (column != e->loc.column) | |
887 | { | |
888 | column = e->loc.column; | |
889 | out_opcode (DW_LNS_set_column); | |
890 | out_uleb128 (column); | |
891 | changed = 1; | |
892 | } | |
893 | ||
894 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) | |
895 | { | |
896 | flags = e->loc.flags; | |
897 | out_opcode (DW_LNS_negate_stmt); | |
898 | changed = 1; | |
899 | } | |
900 | ||
901 | if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) | |
902 | { | |
903 | out_opcode (DW_LNS_set_basic_block); | |
904 | changed = 1; | |
905 | } | |
906 | ||
fb81275c JM |
907 | /* Don't try to optimize away redundant entries; gdb wants two |
908 | entries for a function where the code starts on the same line as | |
909 | the {, and there's no way to identify that case here. Trust gcc | |
910 | to optimize appropriately. */ | |
911 | if (1 /* line != e->loc.line || changed */) | |
220e750f RH |
912 | { |
913 | int line_delta = e->loc.line - line; | |
914 | if (frag == NULL) | |
fac0d250 | 915 | { |
220e750f RH |
916 | out_set_addr (seg, e->frag, e->frag_ofs); |
917 | out_inc_line_addr (line_delta, 0); | |
fac0d250 | 918 | } |
220e750f RH |
919 | else if (frag == e->frag) |
920 | out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); | |
921 | else | |
922 | relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, | |
923 | frag, frag_ofs); | |
924 | ||
925 | frag = e->frag; | |
926 | frag_ofs = e->frag_ofs; | |
927 | line = e->loc.line; | |
fac0d250 | 928 | } |
220e750f RH |
929 | else if (frag == NULL) |
930 | { | |
931 | out_set_addr (seg, e->frag, e->frag_ofs); | |
932 | frag = e->frag; | |
933 | frag_ofs = e->frag_ofs; | |
934 | } | |
935 | ||
936 | next = e->next; | |
937 | free (e); | |
938 | e = next; | |
fac0d250 | 939 | } |
353e2c69 | 940 | |
220e750f RH |
941 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
942 | last_frag = last_frag_for_seg (seg); | |
943 | last_frag_ofs = get_frag_fix (last_frag); | |
944 | if (frag == last_frag) | |
945 | out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); | |
946 | else | |
ee515fb7 | 947 | relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, |
220e750f | 948 | frag, frag_ofs); |
fac0d250 RH |
949 | } |
950 | ||
220e750f RH |
951 | /* Emit the directory and file tables for .debug_line. */ |
952 | ||
fac0d250 | 953 | static void |
220e750f | 954 | out_file_list () |
fac0d250 RH |
955 | { |
956 | size_t size; | |
957 | char *cp; | |
220e750f RH |
958 | unsigned int i; |
959 | ||
960 | /* Terminate directory list. */ | |
961 | out_byte ('\0'); | |
fac0d250 | 962 | |
220e750f | 963 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 964 | { |
249e3833 RH |
965 | if (files[i].filename == NULL) |
966 | { | |
0e389e77 | 967 | as_bad (_("unassigned file number %ld"), (long) i); |
249e3833 RH |
968 | continue; |
969 | } | |
970 | ||
220e750f | 971 | size = strlen (files[i].filename) + 1; |
fac0d250 | 972 | cp = frag_more (size); |
220e750f | 973 | memcpy (cp, files[i].filename, size); |
fac0d250 | 974 | |
220e750f | 975 | out_uleb128 (files[i].dir); /* directory number */ |
fac0d250 RH |
976 | out_uleb128 (0); /* last modification timestamp */ |
977 | out_uleb128 (0); /* filesize */ | |
978 | } | |
353e2c69 KH |
979 | |
980 | /* Terminate filename list. */ | |
981 | out_byte (0); | |
fac0d250 RH |
982 | } |
983 | ||
220e750f RH |
984 | /* Emit the collected .debug_line data. */ |
985 | ||
986 | static void | |
987 | out_debug_line (line_seg) | |
988 | segT line_seg; | |
989 | { | |
990 | expressionS expr; | |
991 | symbolS *line_start; | |
992 | symbolS *prologue_end; | |
993 | symbolS *line_end; | |
994 | struct line_seg *s; | |
995 | ||
996 | subseg_set (line_seg, 0); | |
997 | ||
998 | line_start = symbol_new_now (); | |
999 | prologue_end = symbol_make (fake_label_name); | |
1000 | line_end = symbol_make (fake_label_name); | |
1001 | ||
1002 | /* Total length of the information for this compilation unit. */ | |
1003 | expr.X_op = O_subtract; | |
1004 | expr.X_add_symbol = line_end; | |
1005 | expr.X_op_symbol = line_start; | |
1006 | expr.X_add_number = -4; | |
1007 | emit_expr (&expr, 4); | |
1008 | ||
1009 | /* Version. */ | |
1010 | out_two (2); | |
1011 | ||
1012 | /* Length of the prologue following this length. */ | |
1013 | expr.X_op = O_subtract; | |
1014 | expr.X_add_symbol = prologue_end; | |
1015 | expr.X_op_symbol = line_start; | |
1016 | expr.X_add_number = - (4 + 2 + 4); | |
1017 | emit_expr (&expr, 4); | |
1018 | ||
1019 | /* Parameters of the state machine. */ | |
1020 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1021 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1022 | out_byte (DWARF2_LINE_BASE); | |
1023 | out_byte (DWARF2_LINE_RANGE); | |
1024 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1025 | ||
1026 | /* Standard opcode lengths. */ | |
1027 | out_byte (0); /* DW_LNS_copy */ | |
1028 | out_byte (1); /* DW_LNS_advance_pc */ | |
1029 | out_byte (1); /* DW_LNS_advance_line */ | |
1030 | out_byte (1); /* DW_LNS_set_file */ | |
1031 | out_byte (1); /* DW_LNS_set_column */ | |
1032 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1033 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1034 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1035 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
1036 | ||
1037 | out_file_list (); | |
1038 | ||
1039 | set_symbol_value_now (prologue_end); | |
1040 | ||
1041 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1042 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1043 | process_entries (s->seg, s->head->head); |
1044 | ||
1045 | set_symbol_value_now (line_end); | |
1046 | } | |
1047 | ||
1048 | /* Emit data for .debug_aranges. */ | |
1049 | ||
58b5739a | 1050 | static void |
220e750f RH |
1051 | out_debug_aranges (aranges_seg, info_seg) |
1052 | segT aranges_seg; | |
1053 | segT info_seg; | |
fac0d250 | 1054 | { |
220e750f RH |
1055 | unsigned int addr_size = sizeof_address; |
1056 | addressT size, skip; | |
1057 | struct line_seg *s; | |
1058 | expressionS expr; | |
1059 | char *p; | |
fac0d250 | 1060 | |
220e750f | 1061 | size = 4 + 2 + 4 + 1 + 1; |
fac0d250 | 1062 | |
ee515fb7 KH |
1063 | skip = 2 * addr_size - (size & (2 * addr_size - 1)); |
1064 | if (skip == 2 * addr_size) | |
220e750f RH |
1065 | skip = 0; |
1066 | size += skip; | |
fac0d250 | 1067 | |
ee515fb7 KH |
1068 | for (s = all_segs; s; s = s->next) |
1069 | size += 2 * addr_size; | |
fac0d250 | 1070 | |
ee515fb7 | 1071 | size += 2 * addr_size; |
fac0d250 | 1072 | |
220e750f | 1073 | subseg_set (aranges_seg, 0); |
fac0d250 | 1074 | |
220e750f RH |
1075 | /* Length of the compilation unit. */ |
1076 | out_four (size - 4); | |
fac0d250 | 1077 | |
220e750f RH |
1078 | /* Version. */ |
1079 | out_two (2); | |
4dc7ead9 | 1080 | |
220e750f RH |
1081 | /* Offset to .debug_info. */ |
1082 | expr.X_op = O_symbol; | |
1083 | expr.X_add_symbol = section_symbol (info_seg); | |
1084 | expr.X_add_number = 0; | |
1085 | emit_expr (&expr, 4); | |
1086 | ||
1087 | /* Size of an address (offset portion). */ | |
1088 | out_byte (addr_size); | |
1089 | ||
1090 | /* Size of a segment descriptor. */ | |
1091 | out_byte (0); | |
1092 | ||
1093 | /* Align the header. */ | |
1094 | if (skip) | |
ee515fb7 | 1095 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
4dc7ead9 | 1096 | |
ee515fb7 | 1097 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1098 | { |
1099 | fragS *frag; | |
1100 | symbolS *beg, *end; | |
1101 | ||
1102 | frag = first_frag_for_seg (s->seg); | |
1103 | beg = symbol_new (fake_label_name, s->seg, 0, frag); | |
1104 | s->text_start = beg; | |
1105 | ||
1106 | frag = last_frag_for_seg (s->seg); | |
1107 | end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); | |
1108 | s->text_end = end; | |
1109 | ||
1110 | expr.X_op = O_symbol; | |
1111 | expr.X_add_symbol = beg; | |
1112 | expr.X_add_number = 0; | |
1113 | emit_expr (&expr, addr_size); | |
1114 | ||
1115 | expr.X_op = O_subtract; | |
1116 | expr.X_add_symbol = end; | |
1117 | expr.X_op_symbol = beg; | |
1118 | expr.X_add_number = 0; | |
1119 | emit_expr (&expr, addr_size); | |
1120 | } | |
4dc7ead9 | 1121 | |
220e750f RH |
1122 | p = frag_more (2 * addr_size); |
1123 | md_number_to_chars (p, 0, addr_size); | |
1124 | md_number_to_chars (p + addr_size, 0, addr_size); | |
4dc7ead9 RH |
1125 | } |
1126 | ||
220e750f RH |
1127 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1128 | sync with out_debug_info below. */ | |
fac0d250 | 1129 | |
220e750f RH |
1130 | static void |
1131 | out_debug_abbrev (abbrev_seg) | |
1132 | segT abbrev_seg; | |
1133 | { | |
1134 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1135 | |
220e750f RH |
1136 | out_uleb128 (1); |
1137 | out_uleb128 (DW_TAG_compile_unit); | |
1138 | out_byte (DW_CHILDREN_no); | |
1139 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1140 | if (all_segs->next == NULL) | |
4dc7ead9 | 1141 | { |
220e750f RH |
1142 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
1143 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1144 | } | |
1145 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); | |
1146 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1147 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1148 | out_abbrev (0, 0); | |
a987bfc9 RH |
1149 | |
1150 | /* Terminate the abbreviations for this compilation unit. */ | |
1151 | out_byte (0); | |
220e750f | 1152 | } |
4dc7ead9 | 1153 | |
220e750f | 1154 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1155 | |
220e750f RH |
1156 | static void |
1157 | out_debug_info (info_seg, abbrev_seg, line_seg) | |
1158 | segT info_seg; | |
1159 | segT abbrev_seg; | |
1160 | segT line_seg; | |
1161 | { | |
1162 | char producer[128]; | |
1163 | char *comp_dir; | |
1164 | expressionS expr; | |
1165 | symbolS *info_start; | |
1166 | symbolS *info_end; | |
1167 | char *p; | |
1168 | int len; | |
4dc7ead9 | 1169 | |
220e750f | 1170 | subseg_set (info_seg, 0); |
4dc7ead9 | 1171 | |
ee515fb7 | 1172 | info_start = symbol_new_now (); |
220e750f | 1173 | info_end = symbol_make (fake_label_name); |
4dc7ead9 | 1174 | |
220e750f RH |
1175 | /* Compilation Unit length. */ |
1176 | expr.X_op = O_subtract; | |
1177 | expr.X_add_symbol = info_end; | |
1178 | expr.X_op_symbol = info_start; | |
1179 | expr.X_add_number = -4; | |
1180 | emit_expr (&expr, 4); | |
4dc7ead9 | 1181 | |
220e750f RH |
1182 | /* DWARF version. */ |
1183 | out_two (2); | |
4dc7ead9 | 1184 | |
220e750f RH |
1185 | /* .debug_abbrev offset */ |
1186 | expr.X_op = O_symbol; | |
1187 | expr.X_add_symbol = section_symbol (abbrev_seg); | |
1188 | expr.X_add_number = 0; | |
1189 | emit_expr (&expr, 4); | |
4dc7ead9 | 1190 | |
220e750f RH |
1191 | /* Target address size. */ |
1192 | out_byte (sizeof_address); | |
fac0d250 | 1193 | |
220e750f RH |
1194 | /* DW_TAG_compile_unit DIE abbrev */ |
1195 | out_uleb128 (1); | |
fac0d250 | 1196 | |
220e750f RH |
1197 | /* DW_AT_stmt_list */ |
1198 | expr.X_op = O_symbol; | |
1199 | expr.X_add_symbol = section_symbol (line_seg); | |
1200 | expr.X_add_number = 0; | |
1201 | emit_expr (&expr, 4); | |
fac0d250 | 1202 | |
220e750f RH |
1203 | /* These two attributes may only be emitted if all of the code is |
1204 | contiguous. Multiple sections are not that. */ | |
1205 | if (all_segs->next == NULL) | |
58b5739a | 1206 | { |
220e750f RH |
1207 | /* DW_AT_low_pc */ |
1208 | expr.X_op = O_symbol; | |
1209 | expr.X_add_symbol = all_segs->text_start; | |
1210 | expr.X_add_number = 0; | |
1211 | emit_expr (&expr, sizeof_address); | |
1212 | ||
1213 | /* DW_AT_high_pc */ | |
1214 | expr.X_op = O_symbol; | |
1215 | expr.X_add_symbol = all_segs->text_end; | |
1216 | expr.X_add_number = 0; | |
1217 | emit_expr (&expr, sizeof_address); | |
58b5739a RH |
1218 | } |
1219 | ||
220e750f RH |
1220 | /* DW_AT_comp_dir */ |
1221 | comp_dir = getpwd (); | |
1222 | len = strlen (comp_dir) + 1; | |
1223 | p = frag_more (len); | |
1224 | memcpy (p, comp_dir, len); | |
fac0d250 | 1225 | |
220e750f RH |
1226 | /* DW_AT_producer */ |
1227 | sprintf (producer, "GNU AS %s", VERSION); | |
1228 | len = strlen (producer) + 1; | |
1229 | p = frag_more (len); | |
1230 | memcpy (p, producer, len); | |
fac0d250 | 1231 | |
220e750f RH |
1232 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1233 | dwarf2 draft has no standard code for assembler. */ | |
1234 | out_two (DW_LANG_Mips_Assembler); | |
1235 | ||
1236 | set_symbol_value_now (info_end); | |
fac0d250 RH |
1237 | } |
1238 | ||
1239 | void | |
220e750f | 1240 | dwarf2_finish () |
fac0d250 | 1241 | { |
220e750f RH |
1242 | segT line_seg; |
1243 | struct line_seg *s; | |
fac0d250 | 1244 | |
220e750f | 1245 | /* If no debug information was recorded, nothing to do. */ |
45c500fa | 1246 | if (all_segs == NULL && files_in_use <= 1) |
220e750f | 1247 | return; |
fac0d250 | 1248 | |
220e750f | 1249 | /* Calculate the size of an address for the target machine. */ |
220e750f | 1250 | sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8; |
fac0d250 | 1251 | |
220e750f RH |
1252 | /* Create and switch to the line number section. */ |
1253 | line_seg = subseg_new (".debug_line", 0); | |
220e750f | 1254 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); |
fac0d250 | 1255 | |
220e750f | 1256 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1257 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1258 | { |
220e750f RH |
1259 | struct line_subseg *ss = s->head; |
1260 | struct line_entry **ptail = ss->ptail; | |
1261 | ||
1262 | while ((ss = ss->next) != NULL) | |
1263 | { | |
1264 | *ptail = ss->head; | |
1265 | ptail = ss->ptail; | |
1266 | } | |
fac0d250 | 1267 | } |
85a39694 | 1268 | |
220e750f | 1269 | out_debug_line (line_seg); |
85a39694 | 1270 | |
220e750f RH |
1271 | /* If this is assembler generated line info, we need .debug_info |
1272 | and .debug_abbrev sections as well. */ | |
45c500fa | 1273 | if (all_segs != NULL && debug_type == DEBUG_DWARF2) |
220e750f RH |
1274 | { |
1275 | segT abbrev_seg; | |
1276 | segT info_seg; | |
1277 | segT aranges_seg; | |
4dc7ead9 | 1278 | |
220e750f RH |
1279 | info_seg = subseg_new (".debug_info", 0); |
1280 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1281 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1282 | |
220e750f RH |
1283 | bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); |
1284 | bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); | |
1285 | bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); | |
ef99799a | 1286 | |
ee515fb7 | 1287 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1288 | |
220e750f RH |
1289 | out_debug_aranges (aranges_seg, info_seg); |
1290 | out_debug_abbrev (abbrev_seg); | |
1291 | out_debug_info (info_seg, abbrev_seg, line_seg); | |
1292 | } | |
85a39694 | 1293 | } |
92eb7b32 L |
1294 | |
1295 | #else | |
1296 | void | |
1297 | dwarf2_finish () | |
1298 | { | |
1299 | } | |
1300 | ||
1301 | int | |
1302 | dwarf2dbg_estimate_size_before_relax (frag) | |
1303 | fragS *frag ATTRIBUTE_UNUSED; | |
1304 | { | |
1305 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | int | |
1310 | dwarf2dbg_relax_frag (frag) | |
1311 | fragS *frag ATTRIBUTE_UNUSED; | |
1312 | { | |
1313 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | void | |
1318 | dwarf2dbg_convert_frag (frag) | |
1319 | fragS *frag ATTRIBUTE_UNUSED; | |
1320 | { | |
1321 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1322 | } | |
1323 | ||
1324 | void | |
1325 | dwarf2_emit_insn (size) | |
1326 | int size ATTRIBUTE_UNUSED; | |
1327 | { | |
1328 | } | |
1329 | ||
1330 | void | |
1331 | dwarf2_directive_file (dummy) | |
1332 | int dummy ATTRIBUTE_UNUSED; | |
1333 | { | |
3737d051 | 1334 | s_app_file (0); |
92eb7b32 L |
1335 | } |
1336 | ||
1337 | void | |
1338 | dwarf2_directive_loc (dummy) | |
1339 | int dummy ATTRIBUTE_UNUSED; | |
1340 | { | |
1341 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1342 | } | |
1343 | #endif /* BFD_ASSEMBLER */ |