Commit | Line | Data |
---|---|---|
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 | 46 | #ifndef DWARF2_FORMAT |
9605f328 | 47 | # define DWARF2_FORMAT() dwarf2_format_32bit |
14e777e0 KB |
48 | #endif |
49 | ||
9605f328 AO |
50 | #ifndef DWARF2_ADDR_SIZE |
51 | # define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8); | |
52 | #endif | |
53 | ||
54 | ||
92eb7b32 L |
55 | #ifdef BFD_ASSEMBLER |
56 | ||
fac0d250 RH |
57 | #include "subsegs.h" |
58 | ||
d9ac5a3b | 59 | #include "elf/dwarf2.h" |
fac0d250 | 60 | |
fac0d250 RH |
61 | /* Since we can't generate the prolog until the body is complete, we |
62 | use three different subsegments for .debug_line: one holding the | |
63 | prolog, one for the directory and filename info, and one for the | |
64 | body ("statement program"). */ | |
65 | #define DL_PROLOG 0 | |
66 | #define DL_FILES 1 | |
67 | #define DL_BODY 2 | |
68 | ||
69 | /* First special line opcde - leave room for the standard opcodes. | |
70 | Note: If you want to change this, you'll have to update the | |
71 | "standard_opcode_lengths" table that is emitted below in | |
72 | dwarf2_finish(). */ | |
73 | #define DWARF2_LINE_OPCODE_BASE 10 | |
74 | ||
75 | #ifndef DWARF2_LINE_BASE | |
76 | /* Minimum line offset in a special line info. opcode. This value | |
77 | was chosen to give a reasonable range of values. */ | |
78 | # define DWARF2_LINE_BASE -5 | |
79 | #endif | |
80 | ||
81 | /* Range of line offsets in a special line info. opcode. */ | |
82 | #ifndef DWARF2_LINE_RANGE | |
83 | # define DWARF2_LINE_RANGE 14 | |
84 | #endif | |
85 | ||
86 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH | |
87 | /* Define the architecture-dependent minimum instruction length (in | |
88 | bytes). This value should be rather too small than too big. */ | |
4dc7ead9 | 89 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
fac0d250 RH |
90 | #endif |
91 | ||
92 | /* Flag that indicates the initial value of the is_stmt_start flag. | |
93 | In the present implementation, we do not mark any lines as | |
94 | the beginning of a source statement, because that information | |
95 | is not made available by the GCC front-end. */ | |
96 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 | |
97 | ||
cb30237e | 98 | /* Given a special op, return the line skip amount. */ |
fac0d250 RH |
99 | #define SPECIAL_LINE(op) \ |
100 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) | |
101 | ||
102 | /* Given a special op, return the address skip amount (in units of | |
103 | DWARF2_LINE_MIN_INSN_LENGTH. */ | |
104 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) | |
105 | ||
cb30237e | 106 | /* The maximum address skip amount that can be encoded with a special op. */ |
fac0d250 RH |
107 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
108 | ||
ee515fb7 | 109 | struct line_entry { |
220e750f RH |
110 | struct line_entry *next; |
111 | fragS *frag; | |
112 | addressT frag_ofs; | |
113 | struct dwarf2_line_info loc; | |
e6c774b4 | 114 | }; |
fac0d250 | 115 | |
ee515fb7 | 116 | struct line_subseg { |
220e750f RH |
117 | struct line_subseg *next; |
118 | subsegT subseg; | |
119 | struct line_entry *head; | |
120 | struct line_entry **ptail; | |
121 | }; | |
353e2c69 | 122 | |
ee515fb7 | 123 | struct line_seg { |
220e750f RH |
124 | struct line_seg *next; |
125 | segT seg; | |
126 | struct line_subseg *head; | |
127 | symbolS *text_start; | |
128 | symbolS *text_end; | |
129 | }; | |
130 | ||
131 | /* Collects data for all line table entries during assembly. */ | |
132 | static struct line_seg *all_segs; | |
133 | ||
ee515fb7 | 134 | struct file_entry { |
220e750f RH |
135 | char *filename; |
136 | unsigned int dir; | |
137 | }; | |
138 | ||
139 | /* Table of files used by .debug_line. */ | |
140 | static struct file_entry *files; | |
141 | static unsigned int files_in_use; | |
142 | static unsigned int files_allocated; | |
143 | ||
b34976b6 | 144 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
220e750f | 145 | doing work when there's nothing to do. */ |
b34976b6 | 146 | static bfd_boolean loc_directive_seen; |
220e750f RH |
147 | |
148 | /* Current location as indicated by the most recent .loc directive. */ | |
149 | static struct dwarf2_line_info current; | |
150 | ||
151 | /* Fake label name. */ | |
152 | static char const fake_label_name[] = ".L0\001"; | |
153 | ||
154 | /* The size of an address on the target. */ | |
155 | static unsigned int sizeof_address; | |
156 | \f | |
157 | static struct line_subseg *get_line_subseg PARAMS ((segT, subsegT)); | |
158 | static unsigned int get_filenum PARAMS ((const char *)); | |
159 | static struct frag *first_frag_for_seg PARAMS ((segT)); | |
160 | static struct frag *last_frag_for_seg PARAMS ((segT)); | |
161 | static void out_byte PARAMS ((int)); | |
162 | static void out_opcode PARAMS ((int)); | |
163 | static void out_two PARAMS ((int)); | |
164 | static void out_four PARAMS ((int)); | |
165 | static void out_abbrev PARAMS ((int, int)); | |
166 | static void out_uleb128 PARAMS ((addressT)); | |
167 | static symbolS *symbol_new_now PARAMS ((void)); | |
168 | static void set_symbol_value_now PARAMS ((symbolS *)); | |
169 | static offsetT get_frag_fix PARAMS ((fragS *)); | |
170 | static void out_set_addr PARAMS ((segT, fragS *, addressT)); | |
171 | static int size_inc_line_addr PARAMS ((int, addressT)); | |
172 | static void emit_inc_line_addr PARAMS ((int, addressT, char *, int)); | |
173 | static void out_inc_line_addr PARAMS ((int, addressT)); | |
174 | static void relax_inc_line_addr PARAMS ((int, segT, fragS *, addressT, | |
175 | fragS *, addressT)); | |
176 | static void process_entries PARAMS ((segT, struct line_entry *)); | |
177 | static void out_file_list PARAMS ((void)); | |
178 | static void out_debug_line PARAMS ((segT)); | |
179 | static void out_debug_aranges PARAMS ((segT, segT)); | |
180 | static void out_debug_abbrev PARAMS ((segT)); | |
181 | static void out_debug_info PARAMS ((segT, segT, segT)); | |
182 | \f | |
183 | /* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ | |
184 | ||
185 | static struct line_subseg * | |
186 | get_line_subseg (seg, subseg) | |
187 | segT seg; | |
188 | subsegT subseg; | |
189 | { | |
190 | static segT last_seg; | |
191 | static subsegT last_subseg; | |
192 | static struct line_subseg *last_line_subseg; | |
193 | ||
194 | struct line_seg *s; | |
195 | struct line_subseg **pss, *ss; | |
fac0d250 | 196 | |
220e750f RH |
197 | if (seg == last_seg && subseg == last_subseg) |
198 | return last_line_subseg; | |
199 | ||
ee515fb7 | 200 | for (s = all_segs; s; s = s->next) |
220e750f RH |
201 | if (s->seg == seg) |
202 | goto found_seg; | |
203 | ||
204 | s = (struct line_seg *) xmalloc (sizeof (*s)); | |
205 | s->next = all_segs; | |
206 | s->seg = seg; | |
207 | s->head = NULL; | |
208 | all_segs = s; | |
209 | ||
210 | found_seg: | |
211 | for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) | |
fac0d250 | 212 | { |
220e750f | 213 | if (ss->subseg == subseg) |
ee515fb7 | 214 | goto found_subseg; |
220e750f RH |
215 | if (ss->subseg > subseg) |
216 | break; | |
fac0d250 | 217 | } |
220e750f RH |
218 | |
219 | ss = (struct line_subseg *) xmalloc (sizeof (*ss)); | |
220 | ss->next = *pss; | |
221 | ss->subseg = subseg; | |
222 | ss->head = NULL; | |
223 | ss->ptail = &ss->head; | |
224 | *pss = ss; | |
225 | ||
226 | found_subseg: | |
227 | last_seg = seg; | |
228 | last_subseg = subseg; | |
229 | last_line_subseg = ss; | |
230 | ||
231 | return ss; | |
fac0d250 RH |
232 | } |
233 | ||
220e750f | 234 | /* Record an entry for LOC ocurring at OFS within the current fragment. */ |
353e2c69 | 235 | |
220e750f RH |
236 | void |
237 | dwarf2_gen_line_info (ofs, loc) | |
238 | addressT ofs; | |
239 | struct dwarf2_line_info *loc; | |
fac0d250 | 240 | { |
220e750f RH |
241 | struct line_subseg *ss; |
242 | struct line_entry *e; | |
1ea5c325 MS |
243 | static unsigned int line = -1; |
244 | static unsigned int filenum = -1; | |
220e750f RH |
245 | |
246 | /* Early out for as-yet incomplete location information. */ | |
247 | if (loc->filenum == 0 || loc->line == 0) | |
248 | return; | |
249 | ||
ffa554ed GK |
250 | /* Don't emit sequences of line symbols for the same line when the |
251 | symbols apply to assembler code. It is necessary to emit | |
252 | duplicate line symbols when a compiler asks for them, because GDB | |
253 | uses them to determine the end of the prologue. */ | |
d1a6c242 | 254 | if (debug_type == DEBUG_DWARF2 |
ffa554ed | 255 | && line == loc->line && filenum == loc->filenum) |
1ea5c325 MS |
256 | return; |
257 | ||
258 | line = loc->line; | |
259 | filenum = loc->filenum; | |
260 | ||
220e750f RH |
261 | e = (struct line_entry *) xmalloc (sizeof (*e)); |
262 | e->next = NULL; | |
263 | e->frag = frag_now; | |
264 | e->frag_ofs = ofs; | |
265 | e->loc = *loc; | |
266 | ||
267 | ss = get_line_subseg (now_seg, now_subseg); | |
268 | *ss->ptail = e; | |
269 | ss->ptail = &e->next; | |
270 | } | |
fac0d250 | 271 | |
220e750f RH |
272 | void |
273 | dwarf2_where (line) | |
274 | struct dwarf2_line_info *line; | |
275 | { | |
276 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 277 | { |
220e750f RH |
278 | char *filename; |
279 | as_where (&filename, &line->line); | |
280 | line->filenum = get_filenum (filename); | |
281 | line->column = 0; | |
282 | line->flags = DWARF2_FLAG_BEGIN_STMT; | |
fac0d250 | 283 | } |
220e750f RH |
284 | else |
285 | *line = current; | |
fac0d250 RH |
286 | } |
287 | ||
220e750f RH |
288 | /* Called for each machine instruction, or relatively atomic group of |
289 | machine instructions (ie built-in macro). The instruction or group | |
290 | is SIZE bytes in length. If dwarf2 line number generation is called | |
291 | for, emit a line statement appropriately. */ | |
353e2c69 | 292 | |
220e750f RH |
293 | void |
294 | dwarf2_emit_insn (size) | |
295 | int size; | |
fac0d250 | 296 | { |
220e750f | 297 | struct dwarf2_line_info loc; |
fac0d250 | 298 | |
b6675117 | 299 | if (loc_directive_seen) |
1080e97d L |
300 | { |
301 | /* Use the last location established by a .loc directive, not | |
302 | the value returned by dwarf2_where(). That calls as_where() | |
303 | which will return either the logical input file name (foo.c) | |
304 | or the physical input file name (foo.s) and not the file name | |
305 | specified in the most recent .loc directive (eg foo.h). */ | |
306 | loc = current; | |
307 | ||
308 | /* Unless we generate DWARF2 debugging information for each | |
309 | assembler line, we only emit one line symbol for one LOC. */ | |
310 | if (debug_type != DEBUG_DWARF2) | |
b34976b6 | 311 | loc_directive_seen = FALSE; |
1080e97d | 312 | } |
b6675117 | 313 | else if (debug_type != DEBUG_DWARF2) |
220e750f | 314 | return; |
b6675117 NC |
315 | else |
316 | dwarf2_where (& loc); | |
317 | ||
220e750f RH |
318 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
319 | } | |
fac0d250 | 320 | |
220e750f RH |
321 | /* Get a .debug_line file number for FILENAME. */ |
322 | ||
323 | static unsigned int | |
324 | get_filenum (filename) | |
325 | const char *filename; | |
326 | { | |
327 | static unsigned int last_used; | |
328 | unsigned int i; | |
329 | ||
330 | if (last_used) | |
331 | if (strcmp (filename, files[last_used].filename) == 0) | |
332 | return last_used; | |
333 | ||
334 | for (i = 1; i < files_in_use; ++i) | |
335 | if (strcmp (filename, files[i].filename) == 0) | |
336 | return i; | |
337 | ||
338 | if (i >= files_allocated) | |
fac0d250 | 339 | { |
249e3833 RH |
340 | unsigned int old = files_allocated; |
341 | ||
220e750f RH |
342 | files_allocated = i + 32; |
343 | files = (struct file_entry *) | |
ee515fb7 | 344 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
249e3833 RH |
345 | |
346 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
347 | } |
348 | ||
ee515fb7 | 349 | files[i].filename = xstrdup (filename); |
220e750f RH |
350 | files[i].dir = 0; |
351 | files_in_use = i + 1; | |
352 | last_used = i; | |
353 | ||
354 | return i; | |
355 | } | |
fac0d250 | 356 | |
ecb4347a DJ |
357 | /* Handle two forms of .file directive: |
358 | - Pass .file "source.c" to s_app_file | |
359 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table | |
220e750f | 360 | |
ecb4347a DJ |
361 | If an entry is added to the file table, return a pointer to the filename. */ |
362 | ||
363 | char * | |
220e750f RH |
364 | dwarf2_directive_file (dummy) |
365 | int dummy ATTRIBUTE_UNUSED; | |
366 | { | |
367 | offsetT num; | |
e46d99eb | 368 | char *filename; |
220e750f RH |
369 | int filename_len; |
370 | ||
371 | /* Continue to accept a bare string and pass it off. */ | |
372 | SKIP_WHITESPACE (); | |
373 | if (*input_line_pointer == '"') | |
fac0d250 | 374 | { |
220e750f | 375 | s_app_file (0); |
ecb4347a | 376 | return NULL; |
fac0d250 RH |
377 | } |
378 | ||
220e750f RH |
379 | num = get_absolute_expression (); |
380 | filename = demand_copy_C_string (&filename_len); | |
381 | demand_empty_rest_of_line (); | |
382 | ||
249e3833 | 383 | if (num < 1) |
fac0d250 | 384 | { |
0e389e77 | 385 | as_bad (_("file number less than one")); |
ecb4347a | 386 | return NULL; |
fac0d250 RH |
387 | } |
388 | ||
0e1a166b | 389 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 390 | { |
0e389e77 | 391 | as_bad (_("file number %ld already allocated"), (long) num); |
ecb4347a | 392 | return NULL; |
249e3833 | 393 | } |
220e750f | 394 | |
249e3833 RH |
395 | if (num >= (int) files_allocated) |
396 | { | |
397 | unsigned int old = files_allocated; | |
398 | ||
399 | files_allocated = num + 16; | |
400 | files = (struct file_entry *) | |
401 | xrealloc (files, (num + 16) * sizeof (struct file_entry)); | |
fac0d250 | 402 | |
220e750f | 403 | /* Zero the new memory. */ |
249e3833 | 404 | memset (files + old, 0, (num + 16 - old) * sizeof (struct file_entry)); |
220e750f RH |
405 | } |
406 | ||
249e3833 RH |
407 | files[num].filename = filename; |
408 | files[num].dir = 0; | |
409 | files_in_use = num + 1; | |
ecb4347a DJ |
410 | |
411 | return filename; | |
fac0d250 RH |
412 | } |
413 | ||
220e750f RH |
414 | void |
415 | dwarf2_directive_loc (dummy) | |
416 | int dummy ATTRIBUTE_UNUSED; | |
417 | { | |
418 | offsetT filenum, line, column; | |
419 | ||
420 | filenum = get_absolute_expression (); | |
421 | SKIP_WHITESPACE (); | |
422 | line = get_absolute_expression (); | |
423 | SKIP_WHITESPACE (); | |
424 | column = get_absolute_expression (); | |
425 | demand_empty_rest_of_line (); | |
426 | ||
249e3833 | 427 | if (filenum < 1) |
220e750f | 428 | { |
0e389e77 | 429 | as_bad (_("file number less than one")); |
220e750f RH |
430 | return; |
431 | } | |
249e3833 | 432 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
220e750f | 433 | { |
0e389e77 | 434 | as_bad (_("unassigned file number %ld"), (long) filenum); |
220e750f RH |
435 | return; |
436 | } | |
437 | ||
249e3833 | 438 | current.filenum = filenum; |
220e750f RH |
439 | current.line = line; |
440 | current.column = column; | |
441 | current.flags = DWARF2_FLAG_BEGIN_STMT; | |
442 | ||
b34976b6 | 443 | loc_directive_seen = TRUE; |
220e750f RH |
444 | |
445 | #ifndef NO_LISTING | |
446 | if (listing) | |
9d66a1d9 L |
447 | { |
448 | listing_source_file (files[filenum].filename); | |
449 | listing_source_line (line); | |
450 | } | |
220e750f RH |
451 | #endif |
452 | } | |
220e750f RH |
453 | \f |
454 | static struct frag * | |
455 | first_frag_for_seg (seg) | |
456 | segT seg; | |
457 | { | |
458 | frchainS *f, *first = NULL; | |
459 | ||
ee515fb7 | 460 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
461 | if (f->frch_seg == seg |
462 | && (! first || first->frch_subseg > f->frch_subseg)) | |
463 | first = f; | |
464 | ||
465 | return first ? first->frch_root : NULL; | |
466 | } | |
467 | ||
468 | static struct frag * | |
469 | last_frag_for_seg (seg) | |
470 | segT seg; | |
471 | { | |
472 | frchainS *f, *last = NULL; | |
473 | ||
ee515fb7 | 474 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
475 | if (f->frch_seg == seg |
476 | && (! last || last->frch_subseg < f->frch_subseg)) | |
477 | last= f; | |
478 | ||
479 | return last ? last->frch_last : NULL; | |
480 | } | |
481 | \f | |
482 | /* Emit a single byte into the current segment. */ | |
483 | ||
484 | static inline void | |
485 | out_byte (byte) | |
486 | int byte; | |
487 | { | |
488 | FRAG_APPEND_1_CHAR (byte); | |
489 | } | |
490 | ||
491 | /* Emit a statement program opcode into the current segment. */ | |
492 | ||
493 | static inline void | |
494 | out_opcode (opc) | |
495 | int opc; | |
496 | { | |
497 | out_byte (opc); | |
498 | } | |
499 | ||
500 | /* Emit a two-byte word into the current segment. */ | |
501 | ||
502 | static inline void | |
503 | out_two (data) | |
504 | int data; | |
505 | { | |
506 | md_number_to_chars (frag_more (2), data, 2); | |
507 | } | |
508 | ||
509 | /* Emit a four byte word into the current segment. */ | |
510 | ||
511 | static inline void | |
512 | out_four (data) | |
513 | int data; | |
514 | { | |
515 | md_number_to_chars (frag_more (4), data, 4); | |
516 | } | |
517 | ||
518 | /* Emit an unsigned "little-endian base 128" number. */ | |
519 | ||
fac0d250 | 520 | static void |
220e750f RH |
521 | out_uleb128 (value) |
522 | addressT value; | |
523 | { | |
524 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
525 | } | |
526 | ||
527 | /* Emit a tuple for .debug_abbrev. */ | |
528 | ||
529 | static inline void | |
530 | out_abbrev (name, form) | |
531 | int name, form; | |
fac0d250 | 532 | { |
220e750f RH |
533 | out_uleb128 (name); |
534 | out_uleb128 (form); | |
535 | } | |
fac0d250 | 536 | |
220e750f RH |
537 | /* Create a new fake symbol whose value is the current position. */ |
538 | ||
539 | static symbolS * | |
540 | symbol_new_now () | |
541 | { | |
542 | return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); | |
fac0d250 RH |
543 | } |
544 | ||
220e750f | 545 | /* Set the value of SYM to the current position in the current segment. */ |
353e2c69 | 546 | |
fac0d250 | 547 | static void |
220e750f RH |
548 | set_symbol_value_now (sym) |
549 | symbolS *sym; | |
fac0d250 | 550 | { |
220e750f RH |
551 | S_SET_SEGMENT (sym, now_seg); |
552 | S_SET_VALUE (sym, frag_now_fix ()); | |
553 | symbol_set_frag (sym, frag_now); | |
554 | } | |
555 | ||
556 | /* Get the size of a fragment. */ | |
fac0d250 | 557 | |
220e750f RH |
558 | static offsetT |
559 | get_frag_fix (frag) | |
560 | fragS *frag; | |
561 | { | |
562 | frchainS *fr; | |
563 | ||
564 | if (frag->fr_next) | |
565 | return frag->fr_fix; | |
566 | ||
567 | /* If a fragment is the last in the chain, special measures must be | |
568 | taken to find its size before relaxation, since it may be pending | |
569 | on some subsegment chain. */ | |
ee515fb7 | 570 | for (fr = frchain_root; fr; fr = fr->frch_next) |
220e750f RH |
571 | if (fr->frch_last == frag) |
572 | { | |
7c2b59d0 AM |
573 | long align_mask = -1 << get_recorded_alignment (fr->frch_seg); |
574 | return (((char *) obstack_next_free (&fr->frch_obstack) | |
575 | - frag->fr_literal) + ~align_mask) & align_mask; | |
220e750f RH |
576 | } |
577 | ||
578 | abort (); | |
579 | } | |
fac0d250 | 580 | |
220e750f | 581 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 582 | |
220e750f RH |
583 | static void |
584 | out_set_addr (seg, frag, ofs) | |
585 | segT seg; | |
586 | fragS *frag; | |
587 | addressT ofs; | |
588 | { | |
589 | expressionS expr; | |
590 | symbolS *sym; | |
fac0d250 | 591 | |
220e750f | 592 | sym = symbol_new (fake_label_name, seg, ofs, frag); |
9e3af0e7 | 593 | |
fac0d250 | 594 | out_opcode (DW_LNS_extended_op); |
220e750f | 595 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
596 | |
597 | out_opcode (DW_LNE_set_address); | |
598 | expr.X_op = O_symbol; | |
599 | expr.X_add_symbol = sym; | |
600 | expr.X_add_number = 0; | |
220e750f | 601 | emit_expr (&expr, sizeof_address); |
fac0d250 RH |
602 | } |
603 | ||
a3b75434 | 604 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
c8970b4b AM |
605 | static void scale_addr_delta PARAMS ((addressT *)); |
606 | ||
a3b75434 DD |
607 | static void |
608 | scale_addr_delta (addr_delta) | |
c8970b4b | 609 | addressT *addr_delta; |
a3b75434 DD |
610 | { |
611 | static int printed_this = 0; | |
612 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0) | |
613 | { | |
614 | if (!printed_this) | |
615 | as_bad("unaligned opcodes detected in executable segment"); | |
616 | printed_this = 1; | |
617 | } | |
618 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
619 | } | |
620 | #else | |
621 | #define scale_addr_delta(A) | |
622 | #endif | |
623 | ||
220e750f RH |
624 | /* Encode a pair of line and address skips as efficiently as possible. |
625 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 626 | |
220e750f RH |
627 | The following two routines *must* be kept in sync. This is |
628 | enforced by making emit_inc_line_addr abort if we do not emit | |
629 | exactly the expected number of bytes. */ | |
630 | ||
631 | static int | |
632 | size_inc_line_addr (line_delta, addr_delta) | |
633 | int line_delta; | |
634 | addressT addr_delta; | |
fac0d250 | 635 | { |
220e750f RH |
636 | unsigned int tmp, opcode; |
637 | int len = 0; | |
fac0d250 | 638 | |
220e750f | 639 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 | 640 | scale_addr_delta (&addr_delta); |
220e750f RH |
641 | |
642 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
643 | We cannot use special opcodes here, since we want the end_sequence | |
644 | to emit the matrix entry. */ | |
645 | if (line_delta == INT_MAX) | |
fac0d250 | 646 | { |
220e750f RH |
647 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
648 | len = 1; | |
fac0d250 | 649 | else |
220e750f RH |
650 | len = 1 + sizeof_leb128 (addr_delta, 0); |
651 | return len + 3; | |
fac0d250 | 652 | } |
fac0d250 | 653 | |
220e750f RH |
654 | /* Bias the line delta by the base. */ |
655 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 656 | |
220e750f RH |
657 | /* If the line increment is out of range of a special opcode, we |
658 | must encode it with DW_LNS_advance_line. */ | |
659 | if (tmp >= DWARF2_LINE_RANGE) | |
660 | { | |
661 | len = 1 + sizeof_leb128 (line_delta, 1); | |
662 | line_delta = 0; | |
663 | tmp = 0 - DWARF2_LINE_BASE; | |
664 | } | |
fac0d250 | 665 | |
220e750f RH |
666 | /* Bias the opcode by the special opcode base. */ |
667 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 668 | |
220e750f RH |
669 | /* Avoid overflow when addr_delta is large. */ |
670 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
671 | { | |
672 | /* Try using a special opcode. */ | |
673 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
674 | if (opcode <= 255) | |
675 | return len + 1; | |
676 | ||
677 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
678 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
679 | if (opcode <= 255) | |
680 | return len + 2; | |
681 | } | |
682 | ||
683 | /* Otherwise use DW_LNS_advance_pc. */ | |
684 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
685 | ||
686 | /* DW_LNS_copy or special opcode. */ | |
687 | len += 1; | |
688 | ||
689 | return len; | |
690 | } | |
fac0d250 | 691 | |
220e750f RH |
692 | static void |
693 | emit_inc_line_addr (line_delta, addr_delta, p, len) | |
694 | int line_delta; | |
695 | addressT addr_delta; | |
696 | char *p; | |
697 | int len; | |
698 | { | |
699 | unsigned int tmp, opcode; | |
700 | int need_copy = 0; | |
701 | char *end = p + len; | |
fac0d250 | 702 | |
220e750f | 703 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 DD |
704 | scale_addr_delta (&addr_delta); |
705 | ||
220e750f RH |
706 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
707 | We cannot use special opcodes here, since we want the end_sequence | |
708 | to emit the matrix entry. */ | |
709 | if (line_delta == INT_MAX) | |
fac0d250 | 710 | { |
220e750f RH |
711 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
712 | *p++ = DW_LNS_const_add_pc; | |
713 | else | |
fac0d250 | 714 | { |
220e750f RH |
715 | *p++ = DW_LNS_advance_pc; |
716 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 717 | } |
220e750f RH |
718 | |
719 | *p++ = DW_LNS_extended_op; | |
720 | *p++ = 1; | |
721 | *p++ = DW_LNE_end_sequence; | |
722 | goto done; | |
fac0d250 RH |
723 | } |
724 | ||
220e750f RH |
725 | /* Bias the line delta by the base. */ |
726 | tmp = line_delta - DWARF2_LINE_BASE; | |
727 | ||
728 | /* If the line increment is out of range of a special opcode, we | |
729 | must encode it with DW_LNS_advance_line. */ | |
730 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 731 | { |
220e750f RH |
732 | *p++ = DW_LNS_advance_line; |
733 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 734 | |
220e750f RH |
735 | /* Prettier, I think, to use DW_LNS_copy instead of a |
736 | "line +0, addr +0" special opcode. */ | |
737 | if (addr_delta == 0) | |
738 | { | |
739 | *p++ = DW_LNS_copy; | |
740 | goto done; | |
741 | } | |
cb30237e | 742 | |
220e750f RH |
743 | line_delta = 0; |
744 | tmp = 0 - DWARF2_LINE_BASE; | |
745 | need_copy = 1; | |
746 | } | |
fac0d250 | 747 | |
220e750f RH |
748 | /* Bias the opcode by the special opcode base. */ |
749 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 750 | |
220e750f RH |
751 | /* Avoid overflow when addr_delta is large. */ |
752 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 753 | { |
220e750f RH |
754 | /* Try using a special opcode. */ |
755 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
756 | if (opcode <= 255) | |
757 | { | |
758 | *p++ = opcode; | |
759 | goto done; | |
760 | } | |
761 | ||
762 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
763 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
764 | if (opcode <= 255) | |
fac0d250 | 765 | { |
220e750f RH |
766 | *p++ = DW_LNS_const_add_pc; |
767 | *p++ = opcode; | |
768 | goto done; | |
fac0d250 RH |
769 | } |
770 | } | |
220e750f RH |
771 | |
772 | /* Otherwise use DW_LNS_advance_pc. */ | |
773 | *p++ = DW_LNS_advance_pc; | |
774 | p += output_leb128 (p, addr_delta, 0); | |
775 | ||
776 | if (need_copy) | |
777 | *p++ = DW_LNS_copy; | |
fac0d250 | 778 | else |
220e750f | 779 | *p++ = tmp; |
fac0d250 | 780 | |
220e750f RH |
781 | done: |
782 | assert (p == end); | |
783 | } | |
a8316fe2 | 784 | |
220e750f | 785 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 786 | |
220e750f RH |
787 | static void |
788 | out_inc_line_addr (line_delta, addr_delta) | |
789 | int line_delta; | |
790 | addressT addr_delta; | |
791 | { | |
792 | int len = size_inc_line_addr (line_delta, addr_delta); | |
793 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
794 | } | |
9de8d8f1 | 795 | |
220e750f RH |
796 | /* Generate a variant frag that we can use to relax address/line |
797 | increments between fragments of the target segment. */ | |
9e3af0e7 | 798 | |
220e750f RH |
799 | static void |
800 | relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) | |
801 | int line_delta; | |
802 | segT seg; | |
803 | fragS *to_frag, *from_frag; | |
804 | addressT to_ofs, from_ofs; | |
805 | { | |
806 | symbolS *to_sym, *from_sym; | |
807 | expressionS expr; | |
808 | int max_chars; | |
6576f0b5 | 809 | |
220e750f RH |
810 | to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); |
811 | from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); | |
fac0d250 | 812 | |
220e750f RH |
813 | expr.X_op = O_subtract; |
814 | expr.X_add_symbol = to_sym; | |
815 | expr.X_op_symbol = from_sym; | |
816 | expr.X_add_number = 0; | |
fac0d250 | 817 | |
220e750f RH |
818 | /* The maximum size of the frag is the line delta with a maximum |
819 | sized address delta. */ | |
820 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 821 | |
220e750f RH |
822 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
823 | make_expr_symbol (&expr), line_delta, NULL); | |
824 | } | |
fac0d250 | 825 | |
220e750f RH |
826 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
827 | based on the current values of the symbols. It is called before | |
828 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 829 | |
220e750f RH |
830 | int |
831 | dwarf2dbg_estimate_size_before_relax (frag) | |
832 | fragS *frag; | |
833 | { | |
834 | offsetT addr_delta; | |
835 | int size; | |
fac0d250 | 836 | |
6386f3a7 | 837 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
220e750f | 838 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
fac0d250 | 839 | |
220e750f | 840 | frag->fr_subtype = size; |
fac0d250 | 841 | |
220e750f RH |
842 | return size; |
843 | } | |
844 | ||
845 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
846 | current values of the symbols. fr_subtype is the current length | |
847 | of the frag. This returns the change in frag length. */ | |
848 | ||
849 | int | |
850 | dwarf2dbg_relax_frag (frag) | |
851 | fragS *frag; | |
852 | { | |
853 | int old_size, new_size; | |
fac0d250 | 854 | |
220e750f RH |
855 | old_size = frag->fr_subtype; |
856 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 857 | |
220e750f | 858 | return new_size - old_size; |
fac0d250 RH |
859 | } |
860 | ||
220e750f RH |
861 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
862 | fill frag. This is called after all relaxation has been done. | |
863 | fr_subtype will be the desired length of the frag. */ | |
864 | ||
865 | void | |
866 | dwarf2dbg_convert_frag (frag) | |
867 | fragS *frag; | |
fac0d250 | 868 | { |
220e750f RH |
869 | offsetT addr_diff; |
870 | ||
6386f3a7 | 871 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
fac0d250 | 872 | |
220e750f RH |
873 | /* fr_var carries the max_chars that we created the fragment with. |
874 | fr_subtype carries the current expected length. We must, of | |
875 | course, have allocated enough memory earlier. */ | |
bccba5f0 | 876 | assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 877 | |
ee515fb7 | 878 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
220e750f RH |
879 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
880 | ||
881 | frag->fr_fix += frag->fr_subtype; | |
882 | frag->fr_type = rs_fill; | |
883 | frag->fr_var = 0; | |
884 | frag->fr_offset = 0; | |
885 | } | |
886 | ||
887 | /* Generate .debug_line content for the chain of line number entries | |
888 | beginning at E, for segment SEG. */ | |
889 | ||
890 | static void | |
891 | process_entries (seg, e) | |
892 | segT seg; | |
893 | struct line_entry *e; | |
894 | { | |
895 | unsigned filenum = 1; | |
896 | unsigned line = 1; | |
897 | unsigned column = 0; | |
898 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; | |
899 | fragS *frag = NULL; | |
900 | fragS *last_frag; | |
901 | addressT frag_ofs = 0; | |
902 | addressT last_frag_ofs; | |
903 | struct line_entry *next; | |
904 | ||
905 | while (e) | |
fac0d250 | 906 | { |
220e750f RH |
907 | int changed = 0; |
908 | ||
909 | if (filenum != e->loc.filenum) | |
fac0d250 | 910 | { |
220e750f RH |
911 | filenum = e->loc.filenum; |
912 | out_opcode (DW_LNS_set_file); | |
913 | out_uleb128 (filenum); | |
914 | changed = 1; | |
915 | } | |
916 | ||
917 | if (column != e->loc.column) | |
918 | { | |
919 | column = e->loc.column; | |
920 | out_opcode (DW_LNS_set_column); | |
921 | out_uleb128 (column); | |
922 | changed = 1; | |
923 | } | |
924 | ||
925 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) | |
926 | { | |
927 | flags = e->loc.flags; | |
928 | out_opcode (DW_LNS_negate_stmt); | |
929 | changed = 1; | |
930 | } | |
931 | ||
932 | if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) | |
933 | { | |
934 | out_opcode (DW_LNS_set_basic_block); | |
935 | changed = 1; | |
936 | } | |
937 | ||
fb81275c JM |
938 | /* Don't try to optimize away redundant entries; gdb wants two |
939 | entries for a function where the code starts on the same line as | |
940 | the {, and there's no way to identify that case here. Trust gcc | |
941 | to optimize appropriately. */ | |
942 | if (1 /* line != e->loc.line || changed */) | |
220e750f RH |
943 | { |
944 | int line_delta = e->loc.line - line; | |
945 | if (frag == NULL) | |
fac0d250 | 946 | { |
220e750f RH |
947 | out_set_addr (seg, e->frag, e->frag_ofs); |
948 | out_inc_line_addr (line_delta, 0); | |
fac0d250 | 949 | } |
220e750f RH |
950 | else if (frag == e->frag) |
951 | out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); | |
952 | else | |
953 | relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, | |
954 | frag, frag_ofs); | |
955 | ||
956 | frag = e->frag; | |
957 | frag_ofs = e->frag_ofs; | |
958 | line = e->loc.line; | |
fac0d250 | 959 | } |
220e750f RH |
960 | else if (frag == NULL) |
961 | { | |
962 | out_set_addr (seg, e->frag, e->frag_ofs); | |
963 | frag = e->frag; | |
964 | frag_ofs = e->frag_ofs; | |
965 | } | |
966 | ||
967 | next = e->next; | |
968 | free (e); | |
969 | e = next; | |
fac0d250 | 970 | } |
353e2c69 | 971 | |
220e750f RH |
972 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
973 | last_frag = last_frag_for_seg (seg); | |
974 | last_frag_ofs = get_frag_fix (last_frag); | |
975 | if (frag == last_frag) | |
976 | out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); | |
977 | else | |
ee515fb7 | 978 | relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, |
220e750f | 979 | frag, frag_ofs); |
fac0d250 RH |
980 | } |
981 | ||
220e750f RH |
982 | /* Emit the directory and file tables for .debug_line. */ |
983 | ||
fac0d250 | 984 | static void |
220e750f | 985 | out_file_list () |
fac0d250 RH |
986 | { |
987 | size_t size; | |
988 | char *cp; | |
220e750f RH |
989 | unsigned int i; |
990 | ||
991 | /* Terminate directory list. */ | |
992 | out_byte ('\0'); | |
fac0d250 | 993 | |
220e750f | 994 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 995 | { |
249e3833 RH |
996 | if (files[i].filename == NULL) |
997 | { | |
0e389e77 | 998 | as_bad (_("unassigned file number %ld"), (long) i); |
249e3833 RH |
999 | continue; |
1000 | } | |
1001 | ||
220e750f | 1002 | size = strlen (files[i].filename) + 1; |
fac0d250 | 1003 | cp = frag_more (size); |
220e750f | 1004 | memcpy (cp, files[i].filename, size); |
fac0d250 | 1005 | |
220e750f | 1006 | out_uleb128 (files[i].dir); /* directory number */ |
fac0d250 RH |
1007 | out_uleb128 (0); /* last modification timestamp */ |
1008 | out_uleb128 (0); /* filesize */ | |
1009 | } | |
353e2c69 KH |
1010 | |
1011 | /* Terminate filename list. */ | |
1012 | out_byte (0); | |
fac0d250 RH |
1013 | } |
1014 | ||
220e750f RH |
1015 | /* Emit the collected .debug_line data. */ |
1016 | ||
1017 | static void | |
1018 | out_debug_line (line_seg) | |
1019 | segT line_seg; | |
1020 | { | |
1021 | expressionS expr; | |
1022 | symbolS *line_start; | |
1023 | symbolS *prologue_end; | |
1024 | symbolS *line_end; | |
1025 | struct line_seg *s; | |
14e777e0 KB |
1026 | enum dwarf2_format d2f; |
1027 | int sizeof_offset; | |
220e750f RH |
1028 | |
1029 | subseg_set (line_seg, 0); | |
1030 | ||
1031 | line_start = symbol_new_now (); | |
1032 | prologue_end = symbol_make (fake_label_name); | |
1033 | line_end = symbol_make (fake_label_name); | |
1034 | ||
1035 | /* Total length of the information for this compilation unit. */ | |
1036 | expr.X_op = O_subtract; | |
1037 | expr.X_add_symbol = line_end; | |
1038 | expr.X_op_symbol = line_start; | |
14e777e0 KB |
1039 | |
1040 | d2f = DWARF2_FORMAT (); | |
1041 | if (d2f == dwarf2_format_32bit) | |
1042 | { | |
1043 | expr.X_add_number = -4; | |
1044 | emit_expr (&expr, 4); | |
1045 | sizeof_offset = 4; | |
1046 | } | |
1047 | else if (d2f == dwarf2_format_64bit) | |
1048 | { | |
1049 | expr.X_add_number = -12; | |
1050 | out_four (-1); | |
1051 | emit_expr (&expr, 8); | |
1052 | sizeof_offset = 8; | |
1053 | } | |
1054 | else if (d2f == dwarf2_format_64bit_irix) | |
1055 | { | |
1056 | expr.X_add_number = -8; | |
1057 | emit_expr (&expr, 8); | |
1058 | sizeof_offset = 8; | |
1059 | } | |
1060 | else | |
1061 | { | |
1062 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1063 | } | |
220e750f RH |
1064 | |
1065 | /* Version. */ | |
1066 | out_two (2); | |
1067 | ||
1068 | /* Length of the prologue following this length. */ | |
1069 | expr.X_op = O_subtract; | |
1070 | expr.X_add_symbol = prologue_end; | |
1071 | expr.X_op_symbol = line_start; | |
1072 | expr.X_add_number = - (4 + 2 + 4); | |
14e777e0 | 1073 | emit_expr (&expr, sizeof_offset); |
220e750f RH |
1074 | |
1075 | /* Parameters of the state machine. */ | |
1076 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1077 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1078 | out_byte (DWARF2_LINE_BASE); | |
1079 | out_byte (DWARF2_LINE_RANGE); | |
1080 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1081 | ||
1082 | /* Standard opcode lengths. */ | |
1083 | out_byte (0); /* DW_LNS_copy */ | |
1084 | out_byte (1); /* DW_LNS_advance_pc */ | |
1085 | out_byte (1); /* DW_LNS_advance_line */ | |
1086 | out_byte (1); /* DW_LNS_set_file */ | |
1087 | out_byte (1); /* DW_LNS_set_column */ | |
1088 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1089 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1090 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1091 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
1092 | ||
1093 | out_file_list (); | |
1094 | ||
1095 | set_symbol_value_now (prologue_end); | |
1096 | ||
1097 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1098 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1099 | process_entries (s->seg, s->head->head); |
1100 | ||
1101 | set_symbol_value_now (line_end); | |
1102 | } | |
1103 | ||
1104 | /* Emit data for .debug_aranges. */ | |
1105 | ||
58b5739a | 1106 | static void |
220e750f RH |
1107 | out_debug_aranges (aranges_seg, info_seg) |
1108 | segT aranges_seg; | |
1109 | segT info_seg; | |
fac0d250 | 1110 | { |
220e750f RH |
1111 | unsigned int addr_size = sizeof_address; |
1112 | addressT size, skip; | |
1113 | struct line_seg *s; | |
1114 | expressionS expr; | |
1115 | char *p; | |
fac0d250 | 1116 | |
220e750f | 1117 | size = 4 + 2 + 4 + 1 + 1; |
fac0d250 | 1118 | |
ee515fb7 KH |
1119 | skip = 2 * addr_size - (size & (2 * addr_size - 1)); |
1120 | if (skip == 2 * addr_size) | |
220e750f RH |
1121 | skip = 0; |
1122 | size += skip; | |
fac0d250 | 1123 | |
ee515fb7 KH |
1124 | for (s = all_segs; s; s = s->next) |
1125 | size += 2 * addr_size; | |
fac0d250 | 1126 | |
ee515fb7 | 1127 | size += 2 * addr_size; |
fac0d250 | 1128 | |
220e750f | 1129 | subseg_set (aranges_seg, 0); |
fac0d250 | 1130 | |
220e750f RH |
1131 | /* Length of the compilation unit. */ |
1132 | out_four (size - 4); | |
fac0d250 | 1133 | |
220e750f RH |
1134 | /* Version. */ |
1135 | out_two (2); | |
4dc7ead9 | 1136 | |
220e750f RH |
1137 | /* Offset to .debug_info. */ |
1138 | expr.X_op = O_symbol; | |
1139 | expr.X_add_symbol = section_symbol (info_seg); | |
1140 | expr.X_add_number = 0; | |
1141 | emit_expr (&expr, 4); | |
1142 | ||
1143 | /* Size of an address (offset portion). */ | |
1144 | out_byte (addr_size); | |
1145 | ||
1146 | /* Size of a segment descriptor. */ | |
1147 | out_byte (0); | |
1148 | ||
1149 | /* Align the header. */ | |
1150 | if (skip) | |
ee515fb7 | 1151 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
4dc7ead9 | 1152 | |
ee515fb7 | 1153 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1154 | { |
1155 | fragS *frag; | |
1156 | symbolS *beg, *end; | |
1157 | ||
1158 | frag = first_frag_for_seg (s->seg); | |
1159 | beg = symbol_new (fake_label_name, s->seg, 0, frag); | |
1160 | s->text_start = beg; | |
1161 | ||
1162 | frag = last_frag_for_seg (s->seg); | |
1163 | end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); | |
1164 | s->text_end = end; | |
1165 | ||
1166 | expr.X_op = O_symbol; | |
1167 | expr.X_add_symbol = beg; | |
1168 | expr.X_add_number = 0; | |
1169 | emit_expr (&expr, addr_size); | |
1170 | ||
1171 | expr.X_op = O_subtract; | |
1172 | expr.X_add_symbol = end; | |
1173 | expr.X_op_symbol = beg; | |
1174 | expr.X_add_number = 0; | |
1175 | emit_expr (&expr, addr_size); | |
1176 | } | |
4dc7ead9 | 1177 | |
220e750f RH |
1178 | p = frag_more (2 * addr_size); |
1179 | md_number_to_chars (p, 0, addr_size); | |
1180 | md_number_to_chars (p + addr_size, 0, addr_size); | |
4dc7ead9 RH |
1181 | } |
1182 | ||
220e750f RH |
1183 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1184 | sync with out_debug_info below. */ | |
fac0d250 | 1185 | |
220e750f RH |
1186 | static void |
1187 | out_debug_abbrev (abbrev_seg) | |
1188 | segT abbrev_seg; | |
1189 | { | |
1190 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1191 | |
220e750f RH |
1192 | out_uleb128 (1); |
1193 | out_uleb128 (DW_TAG_compile_unit); | |
1194 | out_byte (DW_CHILDREN_no); | |
1195 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1196 | if (all_segs->next == NULL) | |
4dc7ead9 | 1197 | { |
220e750f RH |
1198 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
1199 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1200 | } | |
48b91938 | 1201 | out_abbrev (DW_AT_name, DW_FORM_string); |
220e750f RH |
1202 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); |
1203 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1204 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1205 | out_abbrev (0, 0); | |
a987bfc9 RH |
1206 | |
1207 | /* Terminate the abbreviations for this compilation unit. */ | |
1208 | out_byte (0); | |
220e750f | 1209 | } |
4dc7ead9 | 1210 | |
220e750f | 1211 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1212 | |
220e750f RH |
1213 | static void |
1214 | out_debug_info (info_seg, abbrev_seg, line_seg) | |
1215 | segT info_seg; | |
1216 | segT abbrev_seg; | |
1217 | segT line_seg; | |
1218 | { | |
1219 | char producer[128]; | |
1220 | char *comp_dir; | |
1221 | expressionS expr; | |
1222 | symbolS *info_start; | |
1223 | symbolS *info_end; | |
1224 | char *p; | |
1225 | int len; | |
14e777e0 KB |
1226 | enum dwarf2_format d2f; |
1227 | int sizeof_offset; | |
4dc7ead9 | 1228 | |
220e750f | 1229 | subseg_set (info_seg, 0); |
4dc7ead9 | 1230 | |
ee515fb7 | 1231 | info_start = symbol_new_now (); |
220e750f | 1232 | info_end = symbol_make (fake_label_name); |
4dc7ead9 | 1233 | |
220e750f RH |
1234 | /* Compilation Unit length. */ |
1235 | expr.X_op = O_subtract; | |
1236 | expr.X_add_symbol = info_end; | |
1237 | expr.X_op_symbol = info_start; | |
14e777e0 KB |
1238 | |
1239 | d2f = DWARF2_FORMAT (); | |
1240 | if (d2f == dwarf2_format_32bit) | |
1241 | { | |
1242 | expr.X_add_number = -4; | |
1243 | emit_expr (&expr, 4); | |
1244 | sizeof_offset = 4; | |
1245 | } | |
1246 | else if (d2f == dwarf2_format_64bit) | |
1247 | { | |
1248 | expr.X_add_number = -12; | |
1249 | out_four (-1); | |
1250 | emit_expr (&expr, 8); | |
1251 | sizeof_offset = 8; | |
1252 | } | |
1253 | else if (d2f == dwarf2_format_64bit_irix) | |
1254 | { | |
1255 | expr.X_add_number = -8; | |
1256 | emit_expr (&expr, 8); | |
1257 | sizeof_offset = 8; | |
1258 | } | |
1259 | else | |
1260 | { | |
1261 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1262 | } | |
4dc7ead9 | 1263 | |
220e750f RH |
1264 | /* DWARF version. */ |
1265 | out_two (2); | |
4dc7ead9 | 1266 | |
220e750f RH |
1267 | /* .debug_abbrev offset */ |
1268 | expr.X_op = O_symbol; | |
1269 | expr.X_add_symbol = section_symbol (abbrev_seg); | |
1270 | expr.X_add_number = 0; | |
14e777e0 | 1271 | emit_expr (&expr, sizeof_offset); |
4dc7ead9 | 1272 | |
220e750f RH |
1273 | /* Target address size. */ |
1274 | out_byte (sizeof_address); | |
fac0d250 | 1275 | |
220e750f RH |
1276 | /* DW_TAG_compile_unit DIE abbrev */ |
1277 | out_uleb128 (1); | |
fac0d250 | 1278 | |
220e750f RH |
1279 | /* DW_AT_stmt_list */ |
1280 | expr.X_op = O_symbol; | |
1281 | expr.X_add_symbol = section_symbol (line_seg); | |
1282 | expr.X_add_number = 0; | |
1283 | emit_expr (&expr, 4); | |
fac0d250 | 1284 | |
220e750f RH |
1285 | /* These two attributes may only be emitted if all of the code is |
1286 | contiguous. Multiple sections are not that. */ | |
1287 | if (all_segs->next == NULL) | |
58b5739a | 1288 | { |
220e750f RH |
1289 | /* DW_AT_low_pc */ |
1290 | expr.X_op = O_symbol; | |
1291 | expr.X_add_symbol = all_segs->text_start; | |
1292 | expr.X_add_number = 0; | |
1293 | emit_expr (&expr, sizeof_address); | |
1294 | ||
1295 | /* DW_AT_high_pc */ | |
1296 | expr.X_op = O_symbol; | |
1297 | expr.X_add_symbol = all_segs->text_end; | |
1298 | expr.X_add_number = 0; | |
1299 | emit_expr (&expr, sizeof_address); | |
58b5739a RH |
1300 | } |
1301 | ||
48b91938 RH |
1302 | /* DW_AT_name. We don't have the actual file name that was present |
1303 | on the command line, so assume files[1] is the main input file. | |
1304 | We're not supposed to get called unless at least one line number | |
1305 | entry was emitted, so this should always be defined. */ | |
1306 | if (!files || files_in_use < 1) | |
1307 | abort (); | |
1308 | len = strlen (files[1].filename) + 1; | |
1309 | p = frag_more (len); | |
1310 | memcpy (p, files[1].filename, len); | |
1311 | ||
220e750f RH |
1312 | /* DW_AT_comp_dir */ |
1313 | comp_dir = getpwd (); | |
1314 | len = strlen (comp_dir) + 1; | |
1315 | p = frag_more (len); | |
1316 | memcpy (p, comp_dir, len); | |
fac0d250 | 1317 | |
220e750f RH |
1318 | /* DW_AT_producer */ |
1319 | sprintf (producer, "GNU AS %s", VERSION); | |
1320 | len = strlen (producer) + 1; | |
1321 | p = frag_more (len); | |
1322 | memcpy (p, producer, len); | |
fac0d250 | 1323 | |
220e750f RH |
1324 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1325 | dwarf2 draft has no standard code for assembler. */ | |
1326 | out_two (DW_LANG_Mips_Assembler); | |
1327 | ||
1328 | set_symbol_value_now (info_end); | |
fac0d250 RH |
1329 | } |
1330 | ||
1331 | void | |
220e750f | 1332 | dwarf2_finish () |
fac0d250 | 1333 | { |
220e750f RH |
1334 | segT line_seg; |
1335 | struct line_seg *s; | |
fac0d250 | 1336 | |
70ee4658 DJ |
1337 | /* We don't need to do anything unless: |
1338 | - Some debug information was recorded via .file/.loc | |
1339 | - or, we are generating DWARF2 information ourself (--gdwarf2) | |
1340 | - or, there is a user-provided .debug_info section which could | |
1341 | reference the file table in the .debug_line section we generate | |
1342 | below. */ | |
1343 | if (all_segs == NULL | |
1344 | && debug_type != DEBUG_DWARF2 | |
1345 | && bfd_get_section_by_name (stdoutput, ".debug_info") == NULL) | |
220e750f | 1346 | return; |
fac0d250 | 1347 | |
220e750f | 1348 | /* Calculate the size of an address for the target machine. */ |
9605f328 | 1349 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput); |
fac0d250 | 1350 | |
220e750f RH |
1351 | /* Create and switch to the line number section. */ |
1352 | line_seg = subseg_new (".debug_line", 0); | |
220e750f | 1353 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); |
fac0d250 | 1354 | |
220e750f | 1355 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1356 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1357 | { |
220e750f RH |
1358 | struct line_subseg *ss = s->head; |
1359 | struct line_entry **ptail = ss->ptail; | |
1360 | ||
1361 | while ((ss = ss->next) != NULL) | |
1362 | { | |
1363 | *ptail = ss->head; | |
1364 | ptail = ss->ptail; | |
1365 | } | |
fac0d250 | 1366 | } |
85a39694 | 1367 | |
220e750f | 1368 | out_debug_line (line_seg); |
85a39694 | 1369 | |
220e750f RH |
1370 | /* If this is assembler generated line info, we need .debug_info |
1371 | and .debug_abbrev sections as well. */ | |
45c500fa | 1372 | if (all_segs != NULL && debug_type == DEBUG_DWARF2) |
220e750f RH |
1373 | { |
1374 | segT abbrev_seg; | |
1375 | segT info_seg; | |
1376 | segT aranges_seg; | |
4dc7ead9 | 1377 | |
220e750f RH |
1378 | info_seg = subseg_new (".debug_info", 0); |
1379 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1380 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1381 | |
220e750f RH |
1382 | bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); |
1383 | bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); | |
1384 | bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); | |
ef99799a | 1385 | |
ee515fb7 | 1386 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1387 | |
220e750f RH |
1388 | out_debug_aranges (aranges_seg, info_seg); |
1389 | out_debug_abbrev (abbrev_seg); | |
1390 | out_debug_info (info_seg, abbrev_seg, line_seg); | |
1391 | } | |
85a39694 | 1392 | } |
92eb7b32 L |
1393 | |
1394 | #else | |
1395 | void | |
1396 | dwarf2_finish () | |
1397 | { | |
1398 | } | |
1399 | ||
1400 | int | |
1401 | dwarf2dbg_estimate_size_before_relax (frag) | |
1402 | fragS *frag ATTRIBUTE_UNUSED; | |
1403 | { | |
1404 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | int | |
1409 | dwarf2dbg_relax_frag (frag) | |
1410 | fragS *frag ATTRIBUTE_UNUSED; | |
1411 | { | |
1412 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | void | |
1417 | dwarf2dbg_convert_frag (frag) | |
1418 | fragS *frag ATTRIBUTE_UNUSED; | |
1419 | { | |
1420 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1421 | } | |
1422 | ||
1423 | void | |
1424 | dwarf2_emit_insn (size) | |
1425 | int size ATTRIBUTE_UNUSED; | |
1426 | { | |
1427 | } | |
1428 | ||
70658493 | 1429 | char * |
92eb7b32 L |
1430 | dwarf2_directive_file (dummy) |
1431 | int dummy ATTRIBUTE_UNUSED; | |
1432 | { | |
3737d051 | 1433 | s_app_file (0); |
70658493 | 1434 | return NULL; |
92eb7b32 L |
1435 | } |
1436 | ||
1437 | void | |
1438 | dwarf2_directive_loc (dummy) | |
1439 | int dummy ATTRIBUTE_UNUSED; | |
1440 | { | |
1441 | as_fatal (_("dwarf2 is not supported for this object file format")); | |
1442 | } | |
1443 | #endif /* BFD_ASSEMBLER */ |