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