Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
70658493 | 2 | Copyright 1999, 2000, 2001, 2002 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 | |
70658493 AM |
44 | #include "dwarf2dbg.h" |
45 | ||
14e777e0 KB |
46 | #ifndef DWARF2_FORMAT |
47 | #define DWARF2_FORMAT() dwarf2_format_32bit | |
48 | #endif | |
49 | ||
92eb7b32 L |
50 | #ifdef BFD_ASSEMBLER |
51 | ||
fac0d250 RH |
52 | #include "subsegs.h" |
53 | ||
d9ac5a3b | 54 | #include "elf/dwarf2.h" |
fac0d250 | 55 | |
fac0d250 RH |
56 | /* Since we can't generate the prolog until the body is complete, we |
57 | use three different subsegments for .debug_line: one holding the | |
58 | prolog, one for the directory and filename info, and one for the | |
59 | body ("statement program"). */ | |
60 | #define DL_PROLOG 0 | |
61 | #define DL_FILES 1 | |
62 | #define DL_BODY 2 | |
63 | ||
64 | /* First special line opcde - leave room for the standard opcodes. | |
65 | Note: If you want to change this, you'll have to update the | |
66 | "standard_opcode_lengths" table that is emitted below in | |
67 | dwarf2_finish(). */ | |
68 | #define DWARF2_LINE_OPCODE_BASE 10 | |
69 | ||
70 | #ifndef DWARF2_LINE_BASE | |
71 | /* Minimum line offset in a special line info. opcode. This value | |
72 | was chosen to give a reasonable range of values. */ | |
73 | # define DWARF2_LINE_BASE -5 | |
74 | #endif | |
75 | ||
76 | /* Range of line offsets in a special line info. opcode. */ | |
77 | #ifndef DWARF2_LINE_RANGE | |
78 | # define DWARF2_LINE_RANGE 14 | |
79 | #endif | |
80 | ||
81 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH | |
82 | /* Define the architecture-dependent minimum instruction length (in | |
83 | bytes). This value should be rather too small than too big. */ | |
4dc7ead9 | 84 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
fac0d250 RH |
85 | #endif |
86 | ||
87 | /* Flag that indicates the initial value of the is_stmt_start flag. | |
88 | In the present implementation, we do not mark any lines as | |
89 | the beginning of a source statement, because that information | |
90 | is not made available by the GCC front-end. */ | |
91 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 | |
92 | ||
cb30237e | 93 | /* Given a special op, return the line skip amount. */ |
fac0d250 RH |
94 | #define SPECIAL_LINE(op) \ |
95 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) | |
96 | ||
97 | /* Given a special op, return the address skip amount (in units of | |
98 | DWARF2_LINE_MIN_INSN_LENGTH. */ | |
99 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) | |
100 | ||
cb30237e | 101 | /* The maximum address skip amount that can be encoded with a special op. */ |
fac0d250 RH |
102 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
103 | ||
ee515fb7 | 104 | struct line_entry { |
220e750f RH |
105 | struct line_entry *next; |
106 | fragS *frag; | |
107 | addressT frag_ofs; | |
108 | struct dwarf2_line_info loc; | |
e6c774b4 | 109 | }; |
fac0d250 | 110 | |
ee515fb7 | 111 | struct line_subseg { |
220e750f RH |
112 | struct line_subseg *next; |
113 | subsegT subseg; | |
114 | struct line_entry *head; | |
115 | struct line_entry **ptail; | |
116 | }; | |
353e2c69 | 117 | |
ee515fb7 | 118 | struct line_seg { |
220e750f RH |
119 | struct line_seg *next; |
120 | segT seg; | |
121 | struct line_subseg *head; | |
122 | symbolS *text_start; | |
123 | symbolS *text_end; | |
124 | }; | |
125 | ||
126 | /* Collects data for all line table entries during assembly. */ | |
127 | static struct line_seg *all_segs; | |
128 | ||
ee515fb7 | 129 | struct file_entry { |
220e750f RH |
130 | char *filename; |
131 | unsigned int dir; | |
132 | }; | |
133 | ||
134 | /* Table of files used by .debug_line. */ | |
135 | static struct file_entry *files; | |
136 | static unsigned int files_in_use; | |
137 | static unsigned int files_allocated; | |
138 | ||
220e750f RH |
139 | /* True when we've seen a .loc directive recently. Used to avoid |
140 | doing work when there's nothing to do. */ | |
141 | static boolean loc_directive_seen; | |
142 | ||
143 | /* Current location as indicated by the most recent .loc directive. */ | |
144 | static struct dwarf2_line_info current; | |
145 | ||
146 | /* Fake label name. */ | |
147 | static char const fake_label_name[] = ".L0\001"; | |
148 | ||
149 | /* The size of an address on the target. */ | |
150 | static unsigned int sizeof_address; | |
151 | \f | |
152 | static struct line_subseg *get_line_subseg PARAMS ((segT, subsegT)); | |
153 | static unsigned int get_filenum PARAMS ((const char *)); | |
154 | static struct frag *first_frag_for_seg PARAMS ((segT)); | |
155 | static struct frag *last_frag_for_seg PARAMS ((segT)); | |
156 | static void out_byte PARAMS ((int)); | |
157 | static void out_opcode PARAMS ((int)); | |
158 | static void out_two PARAMS ((int)); | |
159 | static void out_four PARAMS ((int)); | |
160 | static void out_abbrev PARAMS ((int, int)); | |
161 | static void out_uleb128 PARAMS ((addressT)); | |
162 | static symbolS *symbol_new_now PARAMS ((void)); | |
163 | static void set_symbol_value_now PARAMS ((symbolS *)); | |
164 | static offsetT get_frag_fix PARAMS ((fragS *)); | |
165 | static void out_set_addr PARAMS ((segT, fragS *, addressT)); | |
166 | static int size_inc_line_addr PARAMS ((int, addressT)); | |
167 | static void emit_inc_line_addr PARAMS ((int, addressT, char *, int)); | |
168 | static void out_inc_line_addr PARAMS ((int, addressT)); | |
169 | static void relax_inc_line_addr PARAMS ((int, segT, fragS *, addressT, | |
170 | fragS *, addressT)); | |
171 | static void process_entries PARAMS ((segT, struct line_entry *)); | |
172 | static void out_file_list PARAMS ((void)); | |
173 | static void out_debug_line PARAMS ((segT)); | |
174 | static void out_debug_aranges PARAMS ((segT, segT)); | |
175 | static void out_debug_abbrev PARAMS ((segT)); | |
176 | static void out_debug_info PARAMS ((segT, segT, segT)); | |
177 | \f | |
178 | /* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ | |
179 | ||
180 | static struct line_subseg * | |
181 | get_line_subseg (seg, subseg) | |
182 | segT seg; | |
183 | subsegT subseg; | |
184 | { | |
185 | static segT last_seg; | |
186 | static subsegT last_subseg; | |
187 | static struct line_subseg *last_line_subseg; | |
188 | ||
189 | struct line_seg *s; | |
190 | struct line_subseg **pss, *ss; | |
fac0d250 | 191 | |
220e750f RH |
192 | if (seg == last_seg && subseg == last_subseg) |
193 | return last_line_subseg; | |
194 | ||
ee515fb7 | 195 | for (s = all_segs; s; s = s->next) |
220e750f RH |
196 | if (s->seg == seg) |
197 | goto found_seg; | |
198 | ||
199 | s = (struct line_seg *) xmalloc (sizeof (*s)); | |
200 | s->next = all_segs; | |
201 | s->seg = seg; | |
202 | s->head = NULL; | |
203 | all_segs = s; | |
204 | ||
205 | found_seg: | |
206 | for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) | |
fac0d250 | 207 | { |
220e750f | 208 | if (ss->subseg == subseg) |
ee515fb7 | 209 | goto found_subseg; |
220e750f RH |
210 | if (ss->subseg > subseg) |
211 | break; | |
fac0d250 | 212 | } |
220e750f RH |
213 | |
214 | ss = (struct line_subseg *) xmalloc (sizeof (*ss)); | |
215 | ss->next = *pss; | |
216 | ss->subseg = subseg; | |
217 | ss->head = NULL; | |
218 | ss->ptail = &ss->head; | |
219 | *pss = ss; | |
220 | ||
221 | found_subseg: | |
222 | last_seg = seg; | |
223 | last_subseg = subseg; | |
224 | last_line_subseg = ss; | |
225 | ||
226 | return ss; | |
fac0d250 RH |
227 | } |
228 | ||
220e750f | 229 | /* Record an entry for LOC ocurring at OFS within the current fragment. */ |
353e2c69 | 230 | |
220e750f RH |
231 | void |
232 | dwarf2_gen_line_info (ofs, loc) | |
233 | addressT ofs; | |
234 | struct dwarf2_line_info *loc; | |
fac0d250 | 235 | { |
220e750f RH |
236 | struct line_subseg *ss; |
237 | struct line_entry *e; | |
1ea5c325 MS |
238 | static unsigned int line = -1; |
239 | static unsigned int filenum = -1; | |
220e750f RH |
240 | |
241 | /* Early out for as-yet incomplete location information. */ | |
242 | if (loc->filenum == 0 || loc->line == 0) | |
243 | return; | |
244 | ||
ffa554ed GK |
245 | /* Don't emit sequences of line symbols for the same line when the |
246 | symbols apply to assembler code. It is necessary to emit | |
247 | duplicate line symbols when a compiler asks for them, because GDB | |
248 | uses them to determine the end of the prologue. */ | |
d1a6c242 | 249 | if (debug_type == DEBUG_DWARF2 |
ffa554ed | 250 | && line == loc->line && filenum == loc->filenum) |
1ea5c325 MS |
251 | return; |
252 | ||
253 | line = loc->line; | |
254 | filenum = loc->filenum; | |
255 | ||
220e750f RH |
256 | e = (struct line_entry *) xmalloc (sizeof (*e)); |
257 | e->next = NULL; | |
258 | e->frag = frag_now; | |
259 | e->frag_ofs = ofs; | |
260 | e->loc = *loc; | |
261 | ||
262 | ss = get_line_subseg (now_seg, now_subseg); | |
263 | *ss->ptail = e; | |
264 | ss->ptail = &e->next; | |
265 | } | |
fac0d250 | 266 | |
220e750f RH |
267 | void |
268 | dwarf2_where (line) | |
269 | struct dwarf2_line_info *line; | |
270 | { | |
271 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 272 | { |
220e750f RH |
273 | char *filename; |
274 | as_where (&filename, &line->line); | |
275 | line->filenum = get_filenum (filename); | |
276 | line->column = 0; | |
277 | line->flags = DWARF2_FLAG_BEGIN_STMT; | |
fac0d250 | 278 | } |
220e750f RH |
279 | else |
280 | *line = current; | |
fac0d250 RH |
281 | } |
282 | ||
220e750f RH |
283 | /* Called for each machine instruction, or relatively atomic group of |
284 | machine instructions (ie built-in macro). The instruction or group | |
285 | is SIZE bytes in length. If dwarf2 line number generation is called | |
286 | for, emit a line statement appropriately. */ | |
353e2c69 | 287 | |
220e750f RH |
288 | void |
289 | dwarf2_emit_insn (size) | |
290 | int size; | |
fac0d250 | 291 | { |
220e750f | 292 | struct dwarf2_line_info loc; |
fac0d250 | 293 | |
b6675117 | 294 | if (loc_directive_seen) |
1080e97d L |
295 | { |
296 | /* Use the last location established by a .loc directive, not | |
297 | the value returned by dwarf2_where(). That calls as_where() | |
298 | which will return either the logical input file name (foo.c) | |
299 | or the physical input file name (foo.s) and not the file name | |
300 | specified in the most recent .loc directive (eg foo.h). */ | |
301 | loc = current; | |
302 | ||
303 | /* Unless we generate DWARF2 debugging information for each | |
304 | assembler line, we only emit one line symbol for one LOC. */ | |
305 | if (debug_type != DEBUG_DWARF2) | |
306 | loc_directive_seen = false; | |
307 | } | |
b6675117 | 308 | else if (debug_type != DEBUG_DWARF2) |
220e750f | 309 | return; |
b6675117 NC |
310 | else |
311 | dwarf2_where (& loc); | |
312 | ||
220e750f RH |
313 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
314 | } | |
fac0d250 | 315 | |
220e750f RH |
316 | /* Get a .debug_line file number for FILENAME. */ |
317 | ||
318 | static unsigned int | |
319 | get_filenum (filename) | |
320 | const char *filename; | |
321 | { | |
322 | static unsigned int last_used; | |
323 | unsigned int i; | |
324 | ||
325 | if (last_used) | |
326 | if (strcmp (filename, files[last_used].filename) == 0) | |
327 | return last_used; | |
328 | ||
329 | for (i = 1; i < files_in_use; ++i) | |
330 | if (strcmp (filename, files[i].filename) == 0) | |
331 | return i; | |
332 | ||
333 | if (i >= files_allocated) | |
fac0d250 | 334 | { |
249e3833 RH |
335 | unsigned int old = files_allocated; |
336 | ||
220e750f RH |
337 | files_allocated = i + 32; |
338 | files = (struct file_entry *) | |
ee515fb7 | 339 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
249e3833 RH |
340 | |
341 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
342 | } |
343 | ||
ee515fb7 | 344 | files[i].filename = xstrdup (filename); |
220e750f RH |
345 | files[i].dir = 0; |
346 | files_in_use = i + 1; | |
347 | last_used = i; | |
348 | ||
349 | return i; | |
350 | } | |
fac0d250 | 351 | |
ecb4347a DJ |
352 | /* Handle two forms of .file directive: |
353 | - Pass .file "source.c" to s_app_file | |
354 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table | |
220e750f | 355 | |
ecb4347a DJ |
356 | If an entry is added to the file table, return a pointer to the filename. */ |
357 | ||
358 | char * | |
220e750f RH |
359 | dwarf2_directive_file (dummy) |
360 | int dummy ATTRIBUTE_UNUSED; | |
361 | { | |
362 | offsetT num; | |
e46d99eb | 363 | char *filename; |
220e750f RH |
364 | int filename_len; |
365 | ||
366 | /* Continue to accept a bare string and pass it off. */ | |
367 | SKIP_WHITESPACE (); | |
368 | if (*input_line_pointer == '"') | |
fac0d250 | 369 | { |
220e750f | 370 | s_app_file (0); |
ecb4347a | 371 | return NULL; |
fac0d250 RH |
372 | } |
373 | ||
220e750f RH |
374 | num = get_absolute_expression (); |
375 | filename = demand_copy_C_string (&filename_len); | |
376 | demand_empty_rest_of_line (); | |
377 | ||
249e3833 | 378 | if (num < 1) |
fac0d250 | 379 | { |
0e389e77 | 380 | as_bad (_("file number less than one")); |
ecb4347a | 381 | return NULL; |
fac0d250 RH |
382 | } |
383 | ||
0e1a166b | 384 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 385 | { |
0e389e77 | 386 | as_bad (_("file number %ld already allocated"), (long) num); |
ecb4347a | 387 | return NULL; |
249e3833 | 388 | } |
220e750f | 389 | |
249e3833 RH |
390 | if (num >= (int) files_allocated) |
391 | { | |
392 | unsigned int old = files_allocated; | |
393 | ||
394 | files_allocated = num + 16; | |
395 | files = (struct file_entry *) | |
396 | xrealloc (files, (num + 16) * sizeof (struct file_entry)); | |
fac0d250 | 397 | |
220e750f | 398 | /* Zero the new memory. */ |
249e3833 | 399 | memset (files + old, 0, (num + 16 - old) * sizeof (struct file_entry)); |
220e750f RH |
400 | } |
401 | ||
249e3833 RH |
402 | files[num].filename = filename; |
403 | files[num].dir = 0; | |
404 | files_in_use = num + 1; | |
ecb4347a DJ |
405 | |
406 | return filename; | |
fac0d250 RH |
407 | } |
408 | ||
220e750f RH |
409 | void |
410 | dwarf2_directive_loc (dummy) | |
411 | int dummy ATTRIBUTE_UNUSED; | |
412 | { | |
413 | offsetT filenum, line, column; | |
414 | ||
415 | filenum = get_absolute_expression (); | |
416 | SKIP_WHITESPACE (); | |
417 | line = get_absolute_expression (); | |
418 | SKIP_WHITESPACE (); | |
419 | column = get_absolute_expression (); | |
420 | demand_empty_rest_of_line (); | |
421 | ||
249e3833 | 422 | if (filenum < 1) |
220e750f | 423 | { |
0e389e77 | 424 | as_bad (_("file number less than one")); |
220e750f RH |
425 | return; |
426 | } | |
249e3833 | 427 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
220e750f | 428 | { |
0e389e77 | 429 | as_bad (_("unassigned file number %ld"), (long) filenum); |
220e750f RH |
430 | return; |
431 | } | |
432 | ||
249e3833 | 433 | current.filenum = filenum; |
220e750f RH |
434 | current.line = line; |
435 | current.column = column; | |
436 | current.flags = DWARF2_FLAG_BEGIN_STMT; | |
437 | ||
438 | loc_directive_seen = true; | |
439 | ||
440 | #ifndef NO_LISTING | |
441 | if (listing) | |
9d66a1d9 L |
442 | { |
443 | listing_source_file (files[filenum].filename); | |
444 | listing_source_line (line); | |
445 | } | |
220e750f RH |
446 | #endif |
447 | } | |
220e750f RH |
448 | \f |
449 | static struct frag * | |
450 | first_frag_for_seg (seg) | |
451 | segT seg; | |
452 | { | |
453 | frchainS *f, *first = NULL; | |
454 | ||
ee515fb7 | 455 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
456 | if (f->frch_seg == seg |
457 | && (! first || first->frch_subseg > f->frch_subseg)) | |
458 | first = f; | |
459 | ||
460 | return first ? first->frch_root : NULL; | |
461 | } | |
462 | ||
463 | static struct frag * | |
464 | last_frag_for_seg (seg) | |
465 | segT seg; | |
466 | { | |
467 | frchainS *f, *last = NULL; | |
468 | ||
ee515fb7 | 469 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
470 | if (f->frch_seg == seg |
471 | && (! last || last->frch_subseg < f->frch_subseg)) | |
472 | last= f; | |
473 | ||
474 | return last ? last->frch_last : NULL; | |
475 | } | |
476 | \f | |
477 | /* Emit a single byte into the current segment. */ | |
478 | ||
479 | static inline void | |
480 | out_byte (byte) | |
481 | int byte; | |
482 | { | |
483 | FRAG_APPEND_1_CHAR (byte); | |
484 | } | |
485 | ||
486 | /* Emit a statement program opcode into the current segment. */ | |
487 | ||
488 | static inline void | |
489 | out_opcode (opc) | |
490 | int opc; | |
491 | { | |
492 | out_byte (opc); | |
493 | } | |
494 | ||
495 | /* Emit a two-byte word into the current segment. */ | |
496 | ||
497 | static inline void | |
498 | out_two (data) | |
499 | int data; | |
500 | { | |
501 | md_number_to_chars (frag_more (2), data, 2); | |
502 | } | |
503 | ||
504 | /* Emit a four byte word into the current segment. */ | |
505 | ||
506 | static inline void | |
507 | out_four (data) | |
508 | int data; | |
509 | { | |
510 | md_number_to_chars (frag_more (4), data, 4); | |
511 | } | |
512 | ||
513 | /* Emit an unsigned "little-endian base 128" number. */ | |
514 | ||
fac0d250 | 515 | static void |
220e750f RH |
516 | out_uleb128 (value) |
517 | addressT value; | |
518 | { | |
519 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
520 | } | |
521 | ||
522 | /* Emit a tuple for .debug_abbrev. */ | |
523 | ||
524 | static inline void | |
525 | out_abbrev (name, form) | |
526 | int name, form; | |
fac0d250 | 527 | { |
220e750f RH |
528 | out_uleb128 (name); |
529 | out_uleb128 (form); | |
530 | } | |
fac0d250 | 531 | |
220e750f RH |
532 | /* Create a new fake symbol whose value is the current position. */ |
533 | ||
534 | static symbolS * | |
535 | symbol_new_now () | |
536 | { | |
537 | return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); | |
fac0d250 RH |
538 | } |
539 | ||
220e750f | 540 | /* Set the value of SYM to the current position in the current segment. */ |
353e2c69 | 541 | |
fac0d250 | 542 | static void |
220e750f RH |
543 | set_symbol_value_now (sym) |
544 | symbolS *sym; | |
fac0d250 | 545 | { |
220e750f RH |
546 | S_SET_SEGMENT (sym, now_seg); |
547 | S_SET_VALUE (sym, frag_now_fix ()); | |
548 | symbol_set_frag (sym, frag_now); | |
549 | } | |
550 | ||
551 | /* Get the size of a fragment. */ | |
fac0d250 | 552 | |
220e750f RH |
553 | static offsetT |
554 | get_frag_fix (frag) | |
555 | fragS *frag; | |
556 | { | |
557 | frchainS *fr; | |
558 | ||
559 | if (frag->fr_next) | |
560 | return frag->fr_fix; | |
561 | ||
562 | /* If a fragment is the last in the chain, special measures must be | |
563 | taken to find its size before relaxation, since it may be pending | |
564 | on some subsegment chain. */ | |
ee515fb7 | 565 | for (fr = frchain_root; fr; fr = fr->frch_next) |
220e750f RH |
566 | if (fr->frch_last == frag) |
567 | { | |
7c2b59d0 AM |
568 | long align_mask = -1 << get_recorded_alignment (fr->frch_seg); |
569 | return (((char *) obstack_next_free (&fr->frch_obstack) | |
570 | - frag->fr_literal) + ~align_mask) & align_mask; | |
220e750f RH |
571 | } |
572 | ||
573 | abort (); | |
574 | } | |
fac0d250 | 575 | |
220e750f | 576 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 577 | |
220e750f RH |
578 | static void |
579 | out_set_addr (seg, frag, ofs) | |
580 | segT seg; | |
581 | fragS *frag; | |
582 | addressT ofs; | |
583 | { | |
584 | expressionS expr; | |
585 | symbolS *sym; | |
fac0d250 | 586 | |
220e750f | 587 | sym = symbol_new (fake_label_name, seg, ofs, frag); |
9e3af0e7 | 588 | |
fac0d250 | 589 | out_opcode (DW_LNS_extended_op); |
220e750f | 590 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
591 | |
592 | out_opcode (DW_LNE_set_address); | |
593 | expr.X_op = O_symbol; | |
594 | expr.X_add_symbol = sym; | |
595 | expr.X_add_number = 0; | |
220e750f | 596 | emit_expr (&expr, sizeof_address); |
fac0d250 RH |
597 | } |
598 | ||
220e750f RH |
599 | /* Encode a pair of line and address skips as efficiently as possible. |
600 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 601 | |
220e750f RH |
602 | The following two routines *must* be kept in sync. This is |
603 | enforced by making emit_inc_line_addr abort if we do not emit | |
604 | exactly the expected number of bytes. */ | |
605 | ||
606 | static int | |
607 | size_inc_line_addr (line_delta, addr_delta) | |
608 | int line_delta; | |
609 | addressT addr_delta; | |
fac0d250 | 610 | { |
220e750f RH |
611 | unsigned int tmp, opcode; |
612 | int len = 0; | |
fac0d250 | 613 | |
220e750f | 614 | /* Scale the address delta by the minimum instruction length. */ |
ee515fb7 | 615 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
616 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); |
617 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 618 | #endif |
220e750f RH |
619 | |
620 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
621 | We cannot use special opcodes here, since we want the end_sequence | |
622 | to emit the matrix entry. */ | |
623 | if (line_delta == INT_MAX) | |
fac0d250 | 624 | { |
220e750f RH |
625 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
626 | len = 1; | |
fac0d250 | 627 | else |
220e750f RH |
628 | len = 1 + sizeof_leb128 (addr_delta, 0); |
629 | return len + 3; | |
fac0d250 | 630 | } |
fac0d250 | 631 | |
220e750f RH |
632 | /* Bias the line delta by the base. */ |
633 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 634 | |
220e750f RH |
635 | /* If the line increment is out of range of a special opcode, we |
636 | must encode it with DW_LNS_advance_line. */ | |
637 | if (tmp >= DWARF2_LINE_RANGE) | |
638 | { | |
639 | len = 1 + sizeof_leb128 (line_delta, 1); | |
640 | line_delta = 0; | |
641 | tmp = 0 - DWARF2_LINE_BASE; | |
642 | } | |
fac0d250 | 643 | |
220e750f RH |
644 | /* Bias the opcode by the special opcode base. */ |
645 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 646 | |
220e750f RH |
647 | /* Avoid overflow when addr_delta is large. */ |
648 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
649 | { | |
650 | /* Try using a special opcode. */ | |
651 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
652 | if (opcode <= 255) | |
653 | return len + 1; | |
654 | ||
655 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
656 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
657 | if (opcode <= 255) | |
658 | return len + 2; | |
659 | } | |
660 | ||
661 | /* Otherwise use DW_LNS_advance_pc. */ | |
662 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
663 | ||
664 | /* DW_LNS_copy or special opcode. */ | |
665 | len += 1; | |
666 | ||
667 | return len; | |
668 | } | |
fac0d250 | 669 | |
220e750f RH |
670 | static void |
671 | emit_inc_line_addr (line_delta, addr_delta, p, len) | |
672 | int line_delta; | |
673 | addressT addr_delta; | |
674 | char *p; | |
675 | int len; | |
676 | { | |
677 | unsigned int tmp, opcode; | |
678 | int need_copy = 0; | |
679 | char *end = p + len; | |
fac0d250 | 680 | |
ee515fb7 | 681 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
220e750f RH |
682 | /* Scale the address delta by the minimum instruction length. */ |
683 | assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); | |
684 | addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
bccba5f0 | 685 | #endif |
220e750f RH |
686 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
687 | We cannot use special opcodes here, since we want the end_sequence | |
688 | to emit the matrix entry. */ | |
689 | if (line_delta == INT_MAX) | |
fac0d250 | 690 | { |
220e750f RH |
691 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
692 | *p++ = DW_LNS_const_add_pc; | |
693 | else | |
fac0d250 | 694 | { |
220e750f RH |
695 | *p++ = DW_LNS_advance_pc; |
696 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 697 | } |
220e750f RH |
698 | |
699 | *p++ = DW_LNS_extended_op; | |
700 | *p++ = 1; | |
701 | *p++ = DW_LNE_end_sequence; | |
702 | goto done; | |
fac0d250 RH |
703 | } |
704 | ||
220e750f RH |
705 | /* Bias the line delta by the base. */ |
706 | tmp = line_delta - DWARF2_LINE_BASE; | |
707 | ||
708 | /* If the line increment is out of range of a special opcode, we | |
709 | must encode it with DW_LNS_advance_line. */ | |
710 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 711 | { |
220e750f RH |
712 | *p++ = DW_LNS_advance_line; |
713 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 714 | |
220e750f RH |
715 | /* Prettier, I think, to use DW_LNS_copy instead of a |
716 | "line +0, addr +0" special opcode. */ | |
717 | if (addr_delta == 0) | |
718 | { | |
719 | *p++ = DW_LNS_copy; | |
720 | goto done; | |
721 | } | |
cb30237e | 722 | |
220e750f RH |
723 | line_delta = 0; |
724 | tmp = 0 - DWARF2_LINE_BASE; | |
725 | need_copy = 1; | |
726 | } | |
fac0d250 | 727 | |
220e750f RH |
728 | /* Bias the opcode by the special opcode base. */ |
729 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 730 | |
220e750f RH |
731 | /* Avoid overflow when addr_delta is large. */ |
732 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 733 | { |
220e750f RH |
734 | /* Try using a special opcode. */ |
735 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
736 | if (opcode <= 255) | |
737 | { | |
738 | *p++ = opcode; | |
739 | goto done; | |
740 | } | |
741 | ||
742 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
743 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
744 | if (opcode <= 255) | |
fac0d250 | 745 | { |
220e750f RH |
746 | *p++ = DW_LNS_const_add_pc; |
747 | *p++ = opcode; | |
748 | goto done; | |
fac0d250 RH |
749 | } |
750 | } | |
220e750f RH |
751 | |
752 | /* Otherwise use DW_LNS_advance_pc. */ | |
753 | *p++ = DW_LNS_advance_pc; | |
754 | p += output_leb128 (p, addr_delta, 0); | |
755 | ||
756 | if (need_copy) | |
757 | *p++ = DW_LNS_copy; | |
fac0d250 | 758 | else |
220e750f | 759 | *p++ = tmp; |
fac0d250 | 760 | |
220e750f RH |
761 | done: |
762 | assert (p == end); | |
763 | } | |
a8316fe2 | 764 | |
220e750f | 765 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 766 | |
220e750f RH |
767 | static void |
768 | out_inc_line_addr (line_delta, addr_delta) | |
769 | int line_delta; | |
770 | addressT addr_delta; | |
771 | { | |
772 | int len = size_inc_line_addr (line_delta, addr_delta); | |
773 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
774 | } | |
9de8d8f1 | 775 | |
220e750f RH |
776 | /* Generate a variant frag that we can use to relax address/line |
777 | increments between fragments of the target segment. */ | |
9e3af0e7 | 778 | |
220e750f RH |
779 | static void |
780 | relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) | |
781 | int line_delta; | |
782 | segT seg; | |
783 | fragS *to_frag, *from_frag; | |
784 | addressT to_ofs, from_ofs; | |
785 | { | |
786 | symbolS *to_sym, *from_sym; | |
787 | expressionS expr; | |
788 | int max_chars; | |
6576f0b5 | 789 | |
220e750f RH |
790 | to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); |
791 | from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); | |
fac0d250 | 792 | |
220e750f RH |
793 | expr.X_op = O_subtract; |
794 | expr.X_add_symbol = to_sym; | |
795 | expr.X_op_symbol = from_sym; | |
796 | expr.X_add_number = 0; | |
fac0d250 | 797 | |
220e750f RH |
798 | /* The maximum size of the frag is the line delta with a maximum |
799 | sized address delta. */ | |
800 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 801 | |
220e750f RH |
802 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
803 | make_expr_symbol (&expr), line_delta, NULL); | |
804 | } | |
fac0d250 | 805 | |
220e750f RH |
806 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
807 | based on the current values of the symbols. It is called before | |
808 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 809 | |
220e750f RH |
810 | int |
811 | dwarf2dbg_estimate_size_before_relax (frag) | |
812 | fragS *frag; | |
813 | { | |
814 | offsetT addr_delta; | |
815 | int size; | |
fac0d250 | 816 | |
6386f3a7 | 817 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
220e750f | 818 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
fac0d250 | 819 | |
220e750f | 820 | frag->fr_subtype = size; |
fac0d250 | 821 | |
220e750f RH |
822 | return size; |
823 | } | |
824 | ||
825 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
826 | current values of the symbols. fr_subtype is the current length | |
827 | of the frag. This returns the change in frag length. */ | |
828 | ||
829 | int | |
830 | dwarf2dbg_relax_frag (frag) | |
831 | fragS *frag; | |
832 | { | |
833 | int old_size, new_size; | |
fac0d250 | 834 | |
220e750f RH |
835 | old_size = frag->fr_subtype; |
836 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 837 | |
220e750f | 838 | return new_size - old_size; |
fac0d250 RH |
839 | } |
840 | ||
220e750f RH |
841 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
842 | fill frag. This is called after all relaxation has been done. | |
843 | fr_subtype will be the desired length of the frag. */ | |
844 | ||
845 | void | |
846 | dwarf2dbg_convert_frag (frag) | |
847 | fragS *frag; | |
fac0d250 | 848 | { |
220e750f RH |
849 | offsetT addr_diff; |
850 | ||
6386f3a7 | 851 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
fac0d250 | 852 | |
220e750f RH |
853 | /* fr_var carries the max_chars that we created the fragment with. |
854 | fr_subtype carries the current expected length. We must, of | |
855 | course, have allocated enough memory earlier. */ | |
bccba5f0 | 856 | assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 857 | |
ee515fb7 | 858 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
220e750f RH |
859 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
860 | ||
861 | frag->fr_fix += frag->fr_subtype; | |
862 | frag->fr_type = rs_fill; | |
863 | frag->fr_var = 0; | |
864 | frag->fr_offset = 0; | |
865 | } | |
866 | ||
867 | /* Generate .debug_line content for the chain of line number entries | |
868 | beginning at E, for segment SEG. */ | |
869 | ||
870 | static void | |
871 | process_entries (seg, e) | |
872 | segT seg; | |
873 | struct line_entry *e; | |
874 | { | |
875 | unsigned filenum = 1; | |
876 | unsigned line = 1; | |
877 | unsigned column = 0; | |
878 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; | |
879 | fragS *frag = NULL; | |
880 | fragS *last_frag; | |
881 | addressT frag_ofs = 0; | |
882 | addressT last_frag_ofs; | |
883 | struct line_entry *next; | |
884 | ||
885 | while (e) | |
fac0d250 | 886 | { |
220e750f RH |
887 | int changed = 0; |
888 | ||
889 | if (filenum != e->loc.filenum) | |
fac0d250 | 890 | { |
220e750f RH |
891 | filenum = e->loc.filenum; |
892 | out_opcode (DW_LNS_set_file); | |
893 | out_uleb128 (filenum); | |
894 | changed = 1; | |
895 | } | |
896 | ||
897 | if (column != e->loc.column) | |
898 | { | |
899 | column = e->loc.column; | |
900 | out_opcode (DW_LNS_set_column); | |
901 | out_uleb128 (column); | |
902 | changed = 1; | |
903 | } | |
904 | ||
905 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) | |
906 | { | |
907 | flags = e->loc.flags; | |
908 | out_opcode (DW_LNS_negate_stmt); | |
909 | changed = 1; | |
910 | } | |
911 | ||
912 | if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) | |
913 | { | |
914 | out_opcode (DW_LNS_set_basic_block); | |
915 | changed = 1; | |
916 | } | |
917 | ||
fb81275c JM |
918 | /* Don't try to optimize away redundant entries; gdb wants two |
919 | entries for a function where the code starts on the same line as | |
920 | the {, and there's no way to identify that case here. Trust gcc | |
921 | to optimize appropriately. */ | |
922 | if (1 /* line != e->loc.line || changed */) | |
220e750f RH |
923 | { |
924 | int line_delta = e->loc.line - line; | |
925 | if (frag == NULL) | |
fac0d250 | 926 | { |
220e750f RH |
927 | out_set_addr (seg, e->frag, e->frag_ofs); |
928 | out_inc_line_addr (line_delta, 0); | |
fac0d250 | 929 | } |
220e750f RH |
930 | else if (frag == e->frag) |
931 | out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); | |
932 | else | |
933 | relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, | |
934 | frag, frag_ofs); | |
935 | ||
936 | frag = e->frag; | |
937 | frag_ofs = e->frag_ofs; | |
938 | line = e->loc.line; | |
fac0d250 | 939 | } |
220e750f RH |
940 | else if (frag == NULL) |
941 | { | |
942 | out_set_addr (seg, e->frag, e->frag_ofs); | |
943 | frag = e->frag; | |
944 | frag_ofs = e->frag_ofs; | |
945 | } | |
946 | ||
947 | next = e->next; | |
948 | free (e); | |
949 | e = next; | |
fac0d250 | 950 | } |
353e2c69 | 951 | |
220e750f RH |
952 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
953 | last_frag = last_frag_for_seg (seg); | |
954 | last_frag_ofs = get_frag_fix (last_frag); | |
955 | if (frag == last_frag) | |
956 | out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); | |
957 | else | |
ee515fb7 | 958 | relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, |
220e750f | 959 | frag, frag_ofs); |
fac0d250 RH |
960 | } |
961 | ||
220e750f RH |
962 | /* Emit the directory and file tables for .debug_line. */ |
963 | ||
fac0d250 | 964 | static void |
220e750f | 965 | out_file_list () |
fac0d250 RH |
966 | { |
967 | size_t size; | |
968 | char *cp; | |
220e750f RH |
969 | unsigned int i; |
970 | ||
971 | /* Terminate directory list. */ | |
972 | out_byte ('\0'); | |
fac0d250 | 973 | |
220e750f | 974 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 975 | { |
249e3833 RH |
976 | if (files[i].filename == NULL) |
977 | { | |
0e389e77 | 978 | as_bad (_("unassigned file number %ld"), (long) i); |
249e3833 RH |
979 | continue; |
980 | } | |
981 | ||
220e750f | 982 | size = strlen (files[i].filename) + 1; |
fac0d250 | 983 | cp = frag_more (size); |
220e750f | 984 | memcpy (cp, files[i].filename, size); |
fac0d250 | 985 | |
220e750f | 986 | out_uleb128 (files[i].dir); /* directory number */ |
fac0d250 RH |
987 | out_uleb128 (0); /* last modification timestamp */ |
988 | out_uleb128 (0); /* filesize */ | |
989 | } | |
353e2c69 KH |
990 | |
991 | /* Terminate filename list. */ | |
992 | out_byte (0); | |
fac0d250 RH |
993 | } |
994 | ||
220e750f RH |
995 | /* Emit the collected .debug_line data. */ |
996 | ||
997 | static void | |
998 | out_debug_line (line_seg) | |
999 | segT line_seg; | |
1000 | { | |
1001 | expressionS expr; | |
1002 | symbolS *line_start; | |
1003 | symbolS *prologue_end; | |
1004 | symbolS *line_end; | |
1005 | struct line_seg *s; | |
14e777e0 KB |
1006 | enum dwarf2_format d2f; |
1007 | int sizeof_offset; | |
220e750f RH |
1008 | |
1009 | subseg_set (line_seg, 0); | |
1010 | ||
1011 | line_start = symbol_new_now (); | |
1012 | prologue_end = symbol_make (fake_label_name); | |
1013 | line_end = symbol_make (fake_label_name); | |
1014 | ||
1015 | /* Total length of the information for this compilation unit. */ | |
1016 | expr.X_op = O_subtract; | |
1017 | expr.X_add_symbol = line_end; | |
1018 | expr.X_op_symbol = line_start; | |
14e777e0 KB |
1019 | |
1020 | d2f = DWARF2_FORMAT (); | |
1021 | if (d2f == dwarf2_format_32bit) | |
1022 | { | |
1023 | expr.X_add_number = -4; | |
1024 | emit_expr (&expr, 4); | |
1025 | sizeof_offset = 4; | |
1026 | } | |
1027 | else if (d2f == dwarf2_format_64bit) | |
1028 | { | |
1029 | expr.X_add_number = -12; | |
1030 | out_four (-1); | |
1031 | emit_expr (&expr, 8); | |
1032 | sizeof_offset = 8; | |
1033 | } | |
1034 | else if (d2f == dwarf2_format_64bit_irix) | |
1035 | { | |
1036 | expr.X_add_number = -8; | |
1037 | emit_expr (&expr, 8); | |
1038 | sizeof_offset = 8; | |
1039 | } | |
1040 | else | |
1041 | { | |
1042 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1043 | } | |
220e750f RH |
1044 | |
1045 | /* Version. */ | |
1046 | out_two (2); | |
1047 | ||
1048 | /* Length of the prologue following this length. */ | |
1049 | expr.X_op = O_subtract; | |
1050 | expr.X_add_symbol = prologue_end; | |
1051 | expr.X_op_symbol = line_start; | |
1052 | expr.X_add_number = - (4 + 2 + 4); | |
14e777e0 | 1053 | emit_expr (&expr, sizeof_offset); |
220e750f RH |
1054 | |
1055 | /* Parameters of the state machine. */ | |
1056 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1057 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1058 | out_byte (DWARF2_LINE_BASE); | |
1059 | out_byte (DWARF2_LINE_RANGE); | |
1060 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1061 | ||
1062 | /* Standard opcode lengths. */ | |
1063 | out_byte (0); /* DW_LNS_copy */ | |
1064 | out_byte (1); /* DW_LNS_advance_pc */ | |
1065 | out_byte (1); /* DW_LNS_advance_line */ | |
1066 | out_byte (1); /* DW_LNS_set_file */ | |
1067 | out_byte (1); /* DW_LNS_set_column */ | |
1068 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1069 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1070 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1071 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
1072 | ||
1073 | out_file_list (); | |
1074 | ||
1075 | set_symbol_value_now (prologue_end); | |
1076 | ||
1077 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1078 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1079 | process_entries (s->seg, s->head->head); |
1080 | ||
1081 | set_symbol_value_now (line_end); | |
1082 | } | |
1083 | ||
1084 | /* Emit data for .debug_aranges. */ | |
1085 | ||
58b5739a | 1086 | static void |
220e750f RH |
1087 | out_debug_aranges (aranges_seg, info_seg) |
1088 | segT aranges_seg; | |
1089 | segT info_seg; | |
fac0d250 | 1090 | { |
220e750f RH |
1091 | unsigned int addr_size = sizeof_address; |
1092 | addressT size, skip; | |
1093 | struct line_seg *s; | |
1094 | expressionS expr; | |
1095 | char *p; | |
fac0d250 | 1096 | |
220e750f | 1097 | size = 4 + 2 + 4 + 1 + 1; |
fac0d250 | 1098 | |
ee515fb7 KH |
1099 | skip = 2 * addr_size - (size & (2 * addr_size - 1)); |
1100 | if (skip == 2 * addr_size) | |
220e750f RH |
1101 | skip = 0; |
1102 | size += skip; | |
fac0d250 | 1103 | |
ee515fb7 KH |
1104 | for (s = all_segs; s; s = s->next) |
1105 | size += 2 * addr_size; | |
fac0d250 | 1106 | |
ee515fb7 | 1107 | size += 2 * addr_size; |
fac0d250 | 1108 | |
220e750f | 1109 | subseg_set (aranges_seg, 0); |
fac0d250 | 1110 | |
220e750f RH |
1111 | /* Length of the compilation unit. */ |
1112 | out_four (size - 4); | |
fac0d250 | 1113 | |
220e750f RH |
1114 | /* Version. */ |
1115 | out_two (2); | |
4dc7ead9 | 1116 | |
220e750f RH |
1117 | /* Offset to .debug_info. */ |
1118 | expr.X_op = O_symbol; | |
1119 | expr.X_add_symbol = section_symbol (info_seg); | |
1120 | expr.X_add_number = 0; | |
1121 | emit_expr (&expr, 4); | |
1122 | ||
1123 | /* Size of an address (offset portion). */ | |
1124 | out_byte (addr_size); | |
1125 | ||
1126 | /* Size of a segment descriptor. */ | |
1127 | out_byte (0); | |
1128 | ||
1129 | /* Align the header. */ | |
1130 | if (skip) | |
ee515fb7 | 1131 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
4dc7ead9 | 1132 | |
ee515fb7 | 1133 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1134 | { |
1135 | fragS *frag; | |
1136 | symbolS *beg, *end; | |
1137 | ||
1138 | frag = first_frag_for_seg (s->seg); | |
1139 | beg = symbol_new (fake_label_name, s->seg, 0, frag); | |
1140 | s->text_start = beg; | |
1141 | ||
1142 | frag = last_frag_for_seg (s->seg); | |
1143 | end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); | |
1144 | s->text_end = end; | |
1145 | ||
1146 | expr.X_op = O_symbol; | |
1147 | expr.X_add_symbol = beg; | |
1148 | expr.X_add_number = 0; | |
1149 | emit_expr (&expr, addr_size); | |
1150 | ||
1151 | expr.X_op = O_subtract; | |
1152 | expr.X_add_symbol = end; | |
1153 | expr.X_op_symbol = beg; | |
1154 | expr.X_add_number = 0; | |
1155 | emit_expr (&expr, addr_size); | |
1156 | } | |
4dc7ead9 | 1157 | |
220e750f RH |
1158 | p = frag_more (2 * addr_size); |
1159 | md_number_to_chars (p, 0, addr_size); | |
1160 | md_number_to_chars (p + addr_size, 0, addr_size); | |
4dc7ead9 RH |
1161 | } |
1162 | ||
220e750f RH |
1163 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1164 | sync with out_debug_info below. */ | |
fac0d250 | 1165 | |
220e750f RH |
1166 | static void |
1167 | out_debug_abbrev (abbrev_seg) | |
1168 | segT abbrev_seg; | |
1169 | { | |
1170 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1171 | |
220e750f RH |
1172 | out_uleb128 (1); |
1173 | out_uleb128 (DW_TAG_compile_unit); | |
1174 | out_byte (DW_CHILDREN_no); | |
1175 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1176 | if (all_segs->next == NULL) | |
4dc7ead9 | 1177 | { |
220e750f RH |
1178 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
1179 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1180 | } | |
48b91938 | 1181 | out_abbrev (DW_AT_name, DW_FORM_string); |
220e750f RH |
1182 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); |
1183 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1184 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1185 | out_abbrev (0, 0); | |
a987bfc9 RH |
1186 | |
1187 | /* Terminate the abbreviations for this compilation unit. */ | |
1188 | out_byte (0); | |
220e750f | 1189 | } |
4dc7ead9 | 1190 | |
220e750f | 1191 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1192 | |
220e750f RH |
1193 | static void |
1194 | out_debug_info (info_seg, abbrev_seg, line_seg) | |
1195 | segT info_seg; | |
1196 | segT abbrev_seg; | |
1197 | segT line_seg; | |
1198 | { | |
1199 | char producer[128]; | |
1200 | char *comp_dir; | |
1201 | expressionS expr; | |
1202 | symbolS *info_start; | |
1203 | symbolS *info_end; | |
1204 | char *p; | |
1205 | int len; | |
14e777e0 KB |
1206 | enum dwarf2_format d2f; |
1207 | int sizeof_offset; | |
4dc7ead9 | 1208 | |
220e750f | 1209 | subseg_set (info_seg, 0); |
4dc7ead9 | 1210 | |
ee515fb7 | 1211 | info_start = symbol_new_now (); |
220e750f | 1212 | info_end = symbol_make (fake_label_name); |
4dc7ead9 | 1213 | |
220e750f RH |
1214 | /* Compilation Unit length. */ |
1215 | expr.X_op = O_subtract; | |
1216 | expr.X_add_symbol = info_end; | |
1217 | expr.X_op_symbol = info_start; | |
14e777e0 KB |
1218 | |
1219 | d2f = DWARF2_FORMAT (); | |
1220 | if (d2f == dwarf2_format_32bit) | |
1221 | { | |
1222 | expr.X_add_number = -4; | |
1223 | emit_expr (&expr, 4); | |
1224 | sizeof_offset = 4; | |
1225 | } | |
1226 | else if (d2f == dwarf2_format_64bit) | |
1227 | { | |
1228 | expr.X_add_number = -12; | |
1229 | out_four (-1); | |
1230 | emit_expr (&expr, 8); | |
1231 | sizeof_offset = 8; | |
1232 | } | |
1233 | else if (d2f == dwarf2_format_64bit_irix) | |
1234 | { | |
1235 | expr.X_add_number = -8; | |
1236 | emit_expr (&expr, 8); | |
1237 | sizeof_offset = 8; | |
1238 | } | |
1239 | else | |
1240 | { | |
1241 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1242 | } | |
4dc7ead9 | 1243 | |
220e750f RH |
1244 | /* DWARF version. */ |
1245 | out_two (2); | |
4dc7ead9 | 1246 | |
220e750f RH |
1247 | /* .debug_abbrev offset */ |
1248 | expr.X_op = O_symbol; | |
1249 | expr.X_add_symbol = section_symbol (abbrev_seg); | |
1250 | expr.X_add_number = 0; | |
14e777e0 | 1251 | emit_expr (&expr, sizeof_offset); |
4dc7ead9 | 1252 | |
220e750f RH |
1253 | /* Target address size. */ |
1254 | out_byte (sizeof_address); | |
fac0d250 | 1255 | |
220e750f RH |
1256 | /* DW_TAG_compile_unit DIE abbrev */ |
1257 | out_uleb128 (1); | |
fac0d250 | 1258 | |
220e750f RH |
1259 | /* DW_AT_stmt_list */ |
1260 | expr.X_op = O_symbol; | |
1261 | expr.X_add_symbol = section_symbol (line_seg); | |
1262 | expr.X_add_number = 0; | |
1263 | emit_expr (&expr, 4); | |
fac0d250 | 1264 | |
220e750f RH |
1265 | /* These two attributes may only be emitted if all of the code is |
1266 | contiguous. Multiple sections are not that. */ | |
1267 | if (all_segs->next == NULL) | |
58b5739a | 1268 | { |
220e750f RH |
1269 | /* DW_AT_low_pc */ |
1270 | expr.X_op = O_symbol; | |
1271 | expr.X_add_symbol = all_segs->text_start; | |
1272 | expr.X_add_number = 0; | |
1273 | emit_expr (&expr, sizeof_address); | |
1274 | ||
1275 | /* DW_AT_high_pc */ | |
1276 | expr.X_op = O_symbol; | |
1277 | expr.X_add_symbol = all_segs->text_end; | |
1278 | expr.X_add_number = 0; | |
1279 | emit_expr (&expr, sizeof_address); | |
58b5739a RH |
1280 | } |
1281 | ||
48b91938 RH |
1282 | /* DW_AT_name. We don't have the actual file name that was present |
1283 | on the command line, so assume files[1] is the main input file. | |
1284 | We're not supposed to get called unless at least one line number | |
1285 | entry was emitted, so this should always be defined. */ | |
1286 | if (!files || files_in_use < 1) | |
1287 | abort (); | |
1288 | len = strlen (files[1].filename) + 1; | |
1289 | p = frag_more (len); | |
1290 | memcpy (p, files[1].filename, len); | |
1291 | ||
220e750f RH |
1292 | /* DW_AT_comp_dir */ |
1293 | comp_dir = getpwd (); | |
1294 | len = strlen (comp_dir) + 1; | |
1295 | p = frag_more (len); | |
1296 | memcpy (p, comp_dir, len); | |
fac0d250 | 1297 | |
220e750f RH |
1298 | /* DW_AT_producer */ |
1299 | sprintf (producer, "GNU AS %s", VERSION); | |
1300 | len = strlen (producer) + 1; | |
1301 | p = frag_more (len); | |
1302 | memcpy (p, producer, len); | |
fac0d250 | 1303 | |
220e750f RH |
1304 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1305 | dwarf2 draft has no standard code for assembler. */ | |
1306 | out_two (DW_LANG_Mips_Assembler); | |
1307 | ||
1308 | set_symbol_value_now (info_end); | |
fac0d250 RH |
1309 | } |
1310 | ||
1311 | void | |
220e750f | 1312 | dwarf2_finish () |
fac0d250 | 1313 | { |
220e750f RH |
1314 | segT line_seg; |
1315 | struct line_seg *s; | |
fac0d250 | 1316 | |
70ee4658 DJ |
1317 | /* We don't need to do anything unless: |
1318 | - Some debug information was recorded via .file/.loc | |
1319 | - or, we are generating DWARF2 information ourself (--gdwarf2) | |
1320 | - or, there is a user-provided .debug_info section which could | |
1321 | reference the file table in the .debug_line section we generate | |
1322 | below. */ | |
1323 | if (all_segs == NULL | |
1324 | && debug_type != DEBUG_DWARF2 | |
1325 | && bfd_get_section_by_name (stdoutput, ".debug_info") == NULL) | |
220e750f | 1326 | return; |
fac0d250 | 1327 | |
220e750f | 1328 | /* Calculate the size of an address for the target machine. */ |
220e750f | 1329 | sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8; |
fac0d250 | 1330 | |
220e750f RH |
1331 | /* Create and switch to the line number section. */ |
1332 | line_seg = subseg_new (".debug_line", 0); | |
220e750f | 1333 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); |
fac0d250 | 1334 | |
220e750f | 1335 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1336 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1337 | { |
220e750f RH |
1338 | struct line_subseg *ss = s->head; |
1339 | struct line_entry **ptail = ss->ptail; | |
1340 | ||
1341 | while ((ss = ss->next) != NULL) | |
1342 | { | |
1343 | *ptail = ss->head; | |
1344 | ptail = ss->ptail; | |
1345 | } | |
fac0d250 | 1346 | } |
85a39694 | 1347 | |
220e750f | 1348 | out_debug_line (line_seg); |
85a39694 | 1349 | |
220e750f RH |
1350 | /* If this is assembler generated line info, we need .debug_info |
1351 | and .debug_abbrev sections as well. */ | |
45c500fa | 1352 | if (all_segs != NULL && debug_type == DEBUG_DWARF2) |
220e750f RH |
1353 | { |
1354 | segT abbrev_seg; | |
1355 | segT info_seg; | |
1356 | segT aranges_seg; | |
4dc7ead9 | 1357 | |
220e750f RH |
1358 | info_seg = subseg_new (".debug_info", 0); |
1359 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1360 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1361 | |
220e750f RH |
1362 | bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); |
1363 | bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); | |
1364 | bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); | |
ef99799a | 1365 | |
ee515fb7 | 1366 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1367 | |
220e750f RH |
1368 | out_debug_aranges (aranges_seg, info_seg); |
1369 | out_debug_abbrev (abbrev_seg); | |
1370 | out_debug_info (info_seg, abbrev_seg, line_seg); | |
1371 | } | |
85a39694 | 1372 | } |
92eb7b32 L |
1373 | |
1374 | #else | |
1375 | void | |
1376 | dwarf2_finish () | |
1377 | { | |
1378 | } | |
1379 | ||
1380 | int | |
1381 | dwarf2dbg_estimate_size_before_relax (frag) | |
1382 | fragS *frag ATTRIBUTE_UNUSED; | |
1383 | { | |
1384 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | int | |
1389 | dwarf2dbg_relax_frag (frag) | |
1390 | fragS *frag ATTRIBUTE_UNUSED; | |
1391 | { | |
1392 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | void | |
1397 | dwarf2dbg_convert_frag (frag) | |
1398 | fragS *frag ATTRIBUTE_UNUSED; | |
1399 | { | |
1400 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1401 | } | |
1402 | ||
1403 | void | |
1404 | dwarf2_emit_insn (size) | |
1405 | int size ATTRIBUTE_UNUSED; | |
1406 | { | |
1407 | } | |
1408 | ||
70658493 | 1409 | char * |
92eb7b32 L |
1410 | dwarf2_directive_file (dummy) |
1411 | int dummy ATTRIBUTE_UNUSED; | |
1412 | { | |
3737d051 | 1413 | s_app_file (0); |
70658493 | 1414 | return NULL; |
92eb7b32 L |
1415 | } |
1416 | ||
1417 | void | |
1418 | dwarf2_directive_loc (dummy) | |
1419 | int dummy ATTRIBUTE_UNUSED; | |
1420 | { | |
1421 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1422 | } | |
1423 | #endif /* BFD_ASSEMBLER */ |