Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
2da5c037 AM |
2 | Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
3 | Free Software Foundation, Inc. | |
fac0d250 RH |
4 | Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
5 | ||
6 | This file is part of GAS, the GNU Assembler. | |
7 | ||
8 | GAS is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GAS is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GAS; see the file COPYING. If not, write to the Free | |
4b4da160 NC |
20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
fac0d250 | 22 | |
89b66cde | 23 | /* Logical line numbers can be controlled by the compiler via the |
fac0d250 RH |
24 | following two directives: |
25 | ||
26 | .file FILENO "file.c" | |
27 | .loc FILENO LINENO [COLUMN] | |
28 | ||
29 | FILENO is the filenumber. */ | |
30 | ||
31 | #include "ansidecl.h" | |
fac0d250 | 32 | #include "as.h" |
92eb7b32 | 33 | |
42dbf88c NC |
34 | #ifdef HAVE_LIMITS_H |
35 | #include <limits.h> | |
92625c16 | 36 | #else |
6717891c NC |
37 | #ifdef HAVE_SYS_PARAM_H |
38 | #include <sys/param.h> | |
39 | #endif | |
6256f9dd | 40 | #ifndef INT_MAX |
ee515fb7 | 41 | #define INT_MAX (int) (((unsigned) (-1)) >> 1) |
42dbf88c | 42 | #endif |
b8f080d6 | 43 | #endif |
42dbf88c | 44 | |
70658493 | 45 | #include "dwarf2dbg.h" |
a7ed1ca2 | 46 | #include <filenames.h> |
70658493 | 47 | |
14e777e0 | 48 | #ifndef DWARF2_FORMAT |
9605f328 | 49 | # define DWARF2_FORMAT() dwarf2_format_32bit |
14e777e0 KB |
50 | #endif |
51 | ||
9605f328 | 52 | #ifndef DWARF2_ADDR_SIZE |
e4475e39 | 53 | # define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) |
9605f328 AO |
54 | #endif |
55 | ||
fac0d250 RH |
56 | #include "subsegs.h" |
57 | ||
d9ac5a3b | 58 | #include "elf/dwarf2.h" |
fac0d250 | 59 | |
fac0d250 RH |
60 | /* Since we can't generate the prolog until the body is complete, we |
61 | use three different subsegments for .debug_line: one holding the | |
62 | prolog, one for the directory and filename info, and one for the | |
63 | body ("statement program"). */ | |
64 | #define DL_PROLOG 0 | |
65 | #define DL_FILES 1 | |
66 | #define DL_BODY 2 | |
67 | ||
68 | /* First special line opcde - leave room for the standard opcodes. | |
69 | Note: If you want to change this, you'll have to update the | |
70 | "standard_opcode_lengths" table that is emitted below in | |
71 | dwarf2_finish(). */ | |
72 | #define DWARF2_LINE_OPCODE_BASE 10 | |
73 | ||
74 | #ifndef DWARF2_LINE_BASE | |
75 | /* Minimum line offset in a special line info. opcode. This value | |
76 | was chosen to give a reasonable range of values. */ | |
77 | # define DWARF2_LINE_BASE -5 | |
78 | #endif | |
79 | ||
80 | /* Range of line offsets in a special line info. opcode. */ | |
81 | #ifndef DWARF2_LINE_RANGE | |
82 | # define DWARF2_LINE_RANGE 14 | |
83 | #endif | |
84 | ||
85 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH | |
86 | /* Define the architecture-dependent minimum instruction length (in | |
87 | bytes). This value should be rather too small than too big. */ | |
4dc7ead9 | 88 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
fac0d250 RH |
89 | #endif |
90 | ||
91 | /* Flag that indicates the initial value of the is_stmt_start flag. | |
92 | In the present implementation, we do not mark any lines as | |
93 | the beginning of a source statement, because that information | |
94 | is not made available by the GCC front-end. */ | |
95 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 | |
96 | ||
cb30237e | 97 | /* Given a special op, return the line skip amount. */ |
fac0d250 RH |
98 | #define SPECIAL_LINE(op) \ |
99 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) | |
100 | ||
101 | /* Given a special op, return the address skip amount (in units of | |
102 | DWARF2_LINE_MIN_INSN_LENGTH. */ | |
103 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) | |
104 | ||
cb30237e | 105 | /* The maximum address skip amount that can be encoded with a special op. */ |
fac0d250 RH |
106 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
107 | ||
ee515fb7 | 108 | struct line_entry { |
220e750f RH |
109 | struct line_entry *next; |
110 | fragS *frag; | |
111 | addressT frag_ofs; | |
112 | struct dwarf2_line_info loc; | |
e6c774b4 | 113 | }; |
fac0d250 | 114 | |
ee515fb7 | 115 | struct line_subseg { |
220e750f RH |
116 | struct line_subseg *next; |
117 | subsegT subseg; | |
118 | struct line_entry *head; | |
119 | struct line_entry **ptail; | |
120 | }; | |
353e2c69 | 121 | |
ee515fb7 | 122 | struct line_seg { |
220e750f RH |
123 | struct line_seg *next; |
124 | segT seg; | |
125 | struct line_subseg *head; | |
126 | symbolS *text_start; | |
127 | symbolS *text_end; | |
128 | }; | |
129 | ||
130 | /* Collects data for all line table entries during assembly. */ | |
131 | static struct line_seg *all_segs; | |
132 | ||
ee515fb7 | 133 | struct file_entry { |
a7ed1ca2 | 134 | const char *filename; |
220e750f RH |
135 | unsigned int dir; |
136 | }; | |
137 | ||
138 | /* Table of files used by .debug_line. */ | |
139 | static struct file_entry *files; | |
140 | static unsigned int files_in_use; | |
141 | static unsigned int files_allocated; | |
142 | ||
a7ed1ca2 NC |
143 | /* Table of directories used by .debug_line. */ |
144 | static char **dirs; | |
145 | static unsigned int dirs_in_use; | |
146 | static unsigned int dirs_allocated; | |
147 | ||
b34976b6 | 148 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
220e750f | 149 | doing work when there's nothing to do. */ |
b34976b6 | 150 | static bfd_boolean loc_directive_seen; |
220e750f RH |
151 | |
152 | /* Current location as indicated by the most recent .loc directive. */ | |
153 | static struct dwarf2_line_info current; | |
154 | ||
220e750f RH |
155 | /* The size of an address on the target. */ |
156 | static unsigned int sizeof_address; | |
157 | \f | |
a2e22468 KH |
158 | static struct line_subseg *get_line_subseg (segT, subsegT); |
159 | static unsigned int get_filenum (const char *, unsigned int); | |
160 | static struct frag *first_frag_for_seg (segT); | |
161 | static struct frag *last_frag_for_seg (segT); | |
162 | static void out_byte (int); | |
163 | static void out_opcode (int); | |
164 | static void out_two (int); | |
165 | static void out_four (int); | |
166 | static void out_abbrev (int, int); | |
167 | static void out_uleb128 (addressT); | |
168 | static offsetT get_frag_fix (fragS *); | |
169 | static void out_set_addr (segT, fragS *, addressT); | |
170 | static int size_inc_line_addr (int, addressT); | |
171 | static void emit_inc_line_addr (int, addressT, char *, int); | |
172 | static void out_inc_line_addr (int, addressT); | |
173 | static void relax_inc_line_addr (int, segT, fragS *, addressT, | |
174 | fragS *, addressT); | |
175 | static void process_entries (segT, struct line_entry *); | |
176 | static void out_file_list (void); | |
177 | static void out_debug_line (segT); | |
178 | static void out_debug_aranges (segT, segT); | |
179 | static void out_debug_abbrev (segT); | |
180 | static void out_debug_info (segT, segT, segT); | |
220e750f | 181 | \f |
c5c0a210 AM |
182 | #ifndef TC_DWARF2_EMIT_OFFSET |
183 | # define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset | |
a2e22468 | 184 | static void generic_dwarf2_emit_offset (symbolS *, unsigned int); |
c5c0a210 | 185 | |
6174d9c8 RH |
186 | /* Create an offset to .dwarf2_*. */ |
187 | ||
188 | static void | |
a2e22468 | 189 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
6174d9c8 RH |
190 | { |
191 | expressionS expr; | |
192 | ||
193 | expr.X_op = O_symbol; | |
194 | expr.X_add_symbol = symbol; | |
195 | expr.X_add_number = 0; | |
196 | emit_expr (&expr, size); | |
197 | } | |
c5c0a210 | 198 | #endif |
6174d9c8 | 199 | |
220e750f RH |
200 | /* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ |
201 | ||
202 | static struct line_subseg * | |
a2e22468 | 203 | get_line_subseg (segT seg, subsegT subseg) |
220e750f RH |
204 | { |
205 | static segT last_seg; | |
206 | static subsegT last_subseg; | |
207 | static struct line_subseg *last_line_subseg; | |
208 | ||
209 | struct line_seg *s; | |
210 | struct line_subseg **pss, *ss; | |
fac0d250 | 211 | |
220e750f RH |
212 | if (seg == last_seg && subseg == last_subseg) |
213 | return last_line_subseg; | |
214 | ||
ee515fb7 | 215 | for (s = all_segs; s; s = s->next) |
220e750f RH |
216 | if (s->seg == seg) |
217 | goto found_seg; | |
218 | ||
219 | s = (struct line_seg *) xmalloc (sizeof (*s)); | |
220 | s->next = all_segs; | |
221 | s->seg = seg; | |
222 | s->head = NULL; | |
223 | all_segs = s; | |
224 | ||
225 | found_seg: | |
226 | for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) | |
fac0d250 | 227 | { |
220e750f | 228 | if (ss->subseg == subseg) |
ee515fb7 | 229 | goto found_subseg; |
220e750f RH |
230 | if (ss->subseg > subseg) |
231 | break; | |
fac0d250 | 232 | } |
220e750f RH |
233 | |
234 | ss = (struct line_subseg *) xmalloc (sizeof (*ss)); | |
235 | ss->next = *pss; | |
236 | ss->subseg = subseg; | |
237 | ss->head = NULL; | |
238 | ss->ptail = &ss->head; | |
239 | *pss = ss; | |
240 | ||
241 | found_subseg: | |
242 | last_seg = seg; | |
243 | last_subseg = subseg; | |
244 | last_line_subseg = ss; | |
245 | ||
246 | return ss; | |
fac0d250 RH |
247 | } |
248 | ||
436d9e46 | 249 | /* Record an entry for LOC occurring at OFS within the current fragment. */ |
353e2c69 | 250 | |
220e750f | 251 | void |
a2e22468 | 252 | dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) |
fac0d250 | 253 | { |
220e750f RH |
254 | struct line_subseg *ss; |
255 | struct line_entry *e; | |
1ea5c325 MS |
256 | static unsigned int line = -1; |
257 | static unsigned int filenum = -1; | |
220e750f RH |
258 | |
259 | /* Early out for as-yet incomplete location information. */ | |
260 | if (loc->filenum == 0 || loc->line == 0) | |
261 | return; | |
262 | ||
ffa554ed GK |
263 | /* Don't emit sequences of line symbols for the same line when the |
264 | symbols apply to assembler code. It is necessary to emit | |
265 | duplicate line symbols when a compiler asks for them, because GDB | |
266 | uses them to determine the end of the prologue. */ | |
d1a6c242 | 267 | if (debug_type == DEBUG_DWARF2 |
ffa554ed | 268 | && line == loc->line && filenum == loc->filenum) |
1ea5c325 MS |
269 | return; |
270 | ||
271 | line = loc->line; | |
272 | filenum = loc->filenum; | |
273 | ||
220e750f RH |
274 | e = (struct line_entry *) xmalloc (sizeof (*e)); |
275 | e->next = NULL; | |
276 | e->frag = frag_now; | |
277 | e->frag_ofs = ofs; | |
278 | e->loc = *loc; | |
279 | ||
280 | ss = get_line_subseg (now_seg, now_subseg); | |
281 | *ss->ptail = e; | |
282 | ss->ptail = &e->next; | |
283 | } | |
fac0d250 | 284 | |
220e750f | 285 | void |
a2e22468 | 286 | dwarf2_where (struct dwarf2_line_info *line) |
220e750f RH |
287 | { |
288 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 289 | { |
220e750f RH |
290 | char *filename; |
291 | as_where (&filename, &line->line); | |
a7ed1ca2 | 292 | line->filenum = get_filenum (filename, 0); |
220e750f RH |
293 | line->column = 0; |
294 | line->flags = DWARF2_FLAG_BEGIN_STMT; | |
fac0d250 | 295 | } |
220e750f RH |
296 | else |
297 | *line = current; | |
fac0d250 RH |
298 | } |
299 | ||
220e750f RH |
300 | /* Called for each machine instruction, or relatively atomic group of |
301 | machine instructions (ie built-in macro). The instruction or group | |
302 | is SIZE bytes in length. If dwarf2 line number generation is called | |
303 | for, emit a line statement appropriately. */ | |
353e2c69 | 304 | |
220e750f | 305 | void |
a2e22468 | 306 | dwarf2_emit_insn (int size) |
fac0d250 | 307 | { |
220e750f | 308 | struct dwarf2_line_info loc; |
fac0d250 | 309 | |
b6675117 | 310 | if (loc_directive_seen) |
1080e97d L |
311 | { |
312 | /* Use the last location established by a .loc directive, not | |
313 | the value returned by dwarf2_where(). That calls as_where() | |
314 | which will return either the logical input file name (foo.c) | |
315 | or the physical input file name (foo.s) and not the file name | |
316 | specified in the most recent .loc directive (eg foo.h). */ | |
317 | loc = current; | |
318 | ||
319 | /* Unless we generate DWARF2 debugging information for each | |
320 | assembler line, we only emit one line symbol for one LOC. */ | |
321 | if (debug_type != DEBUG_DWARF2) | |
b34976b6 | 322 | loc_directive_seen = FALSE; |
1080e97d | 323 | } |
b6675117 | 324 | else if (debug_type != DEBUG_DWARF2) |
220e750f | 325 | return; |
b6675117 NC |
326 | else |
327 | dwarf2_where (& loc); | |
328 | ||
220e750f RH |
329 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
330 | } | |
fac0d250 | 331 | |
a7ed1ca2 NC |
332 | /* Get a .debug_line file number for FILENAME. If NUM is nonzero, |
333 | allocate it on that file table slot, otherwise return the first | |
334 | empty one. */ | |
220e750f RH |
335 | |
336 | static unsigned int | |
a2e22468 | 337 | get_filenum (const char *filename, unsigned int num) |
220e750f | 338 | { |
a7ed1ca2 NC |
339 | static unsigned int last_used, last_used_dir_len; |
340 | const char *file; | |
341 | size_t dir_len; | |
342 | unsigned int i, dir; | |
220e750f | 343 | |
a7ed1ca2 NC |
344 | if (num == 0 && last_used) |
345 | { | |
346 | if (! files[last_used].dir | |
347 | && strcmp (filename, files[last_used].filename) == 0) | |
348 | return last_used; | |
349 | if (files[last_used].dir | |
350 | && strncmp (filename, dirs[files[last_used].dir], | |
351 | last_used_dir_len) == 0 | |
352 | && IS_DIR_SEPARATOR (filename [last_used_dir_len]) | |
353 | && strcmp (filename + last_used_dir_len + 1, | |
354 | files[last_used].filename) == 0) | |
355 | return last_used; | |
356 | } | |
220e750f | 357 | |
a7ed1ca2 NC |
358 | file = lbasename (filename); |
359 | /* Don't make empty string from / or A: from A:/ . */ | |
360 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM | |
361 | if (file <= filename + 3) | |
362 | file = filename; | |
363 | #else | |
364 | if (file == filename + 1) | |
365 | file = filename; | |
366 | #endif | |
367 | dir_len = file - filename; | |
368 | ||
369 | dir = 0; | |
370 | if (dir_len) | |
371 | { | |
372 | --dir_len; | |
373 | for (dir = 1; dir < dirs_in_use; ++dir) | |
4dde8e61 | 374 | if (strncmp (filename, dirs[dir], dir_len) == 0 |
a7ed1ca2 NC |
375 | && dirs[dir][dir_len] == '\0') |
376 | break; | |
377 | ||
378 | if (dir >= dirs_in_use) | |
379 | { | |
380 | if (dir >= dirs_allocated) | |
381 | { | |
382 | dirs_allocated = dir + 32; | |
383 | dirs = (char **) | |
384 | xrealloc (dirs, (dir + 32) * sizeof (const char *)); | |
385 | } | |
386 | ||
387 | dirs[dir] = xmalloc (dir_len + 1); | |
388 | memcpy (dirs[dir], filename, dir_len); | |
389 | dirs[dir][dir_len] = '\0'; | |
390 | dirs_in_use = dir + 1; | |
391 | } | |
392 | } | |
393 | ||
394 | if (num == 0) | |
395 | { | |
396 | for (i = 1; i < files_in_use; ++i) | |
397 | if (files[i].dir == dir | |
88b4ca40 | 398 | && files[i].filename |
a7ed1ca2 NC |
399 | && strcmp (file, files[i].filename) == 0) |
400 | { | |
401 | last_used = i; | |
402 | last_used_dir_len = dir_len; | |
403 | return i; | |
404 | } | |
405 | } | |
406 | else | |
407 | i = num; | |
220e750f RH |
408 | |
409 | if (i >= files_allocated) | |
fac0d250 | 410 | { |
249e3833 RH |
411 | unsigned int old = files_allocated; |
412 | ||
220e750f RH |
413 | files_allocated = i + 32; |
414 | files = (struct file_entry *) | |
ee515fb7 | 415 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
249e3833 RH |
416 | |
417 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
418 | } |
419 | ||
a7ed1ca2 NC |
420 | files[i].filename = num ? file : xstrdup (file); |
421 | files[i].dir = dir; | |
220e750f RH |
422 | files_in_use = i + 1; |
423 | last_used = i; | |
a7ed1ca2 | 424 | last_used_dir_len = dir_len; |
220e750f RH |
425 | |
426 | return i; | |
427 | } | |
fac0d250 | 428 | |
ecb4347a DJ |
429 | /* Handle two forms of .file directive: |
430 | - Pass .file "source.c" to s_app_file | |
431 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table | |
220e750f | 432 | |
ecb4347a DJ |
433 | If an entry is added to the file table, return a pointer to the filename. */ |
434 | ||
435 | char * | |
a2e22468 | 436 | dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) |
220e750f RH |
437 | { |
438 | offsetT num; | |
e46d99eb | 439 | char *filename; |
220e750f RH |
440 | int filename_len; |
441 | ||
442 | /* Continue to accept a bare string and pass it off. */ | |
443 | SKIP_WHITESPACE (); | |
444 | if (*input_line_pointer == '"') | |
fac0d250 | 445 | { |
220e750f | 446 | s_app_file (0); |
ecb4347a | 447 | return NULL; |
fac0d250 RH |
448 | } |
449 | ||
220e750f RH |
450 | num = get_absolute_expression (); |
451 | filename = demand_copy_C_string (&filename_len); | |
452 | demand_empty_rest_of_line (); | |
453 | ||
249e3833 | 454 | if (num < 1) |
fac0d250 | 455 | { |
0e389e77 | 456 | as_bad (_("file number less than one")); |
ecb4347a | 457 | return NULL; |
fac0d250 RH |
458 | } |
459 | ||
0e1a166b | 460 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 461 | { |
0e389e77 | 462 | as_bad (_("file number %ld already allocated"), (long) num); |
ecb4347a | 463 | return NULL; |
249e3833 | 464 | } |
220e750f | 465 | |
a7ed1ca2 | 466 | get_filenum (filename, num); |
ecb4347a DJ |
467 | |
468 | return filename; | |
fac0d250 RH |
469 | } |
470 | ||
220e750f | 471 | void |
a2e22468 | 472 | dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) |
220e750f RH |
473 | { |
474 | offsetT filenum, line, column; | |
475 | ||
476 | filenum = get_absolute_expression (); | |
477 | SKIP_WHITESPACE (); | |
478 | line = get_absolute_expression (); | |
479 | SKIP_WHITESPACE (); | |
480 | column = get_absolute_expression (); | |
481 | demand_empty_rest_of_line (); | |
482 | ||
249e3833 | 483 | if (filenum < 1) |
220e750f | 484 | { |
0e389e77 | 485 | as_bad (_("file number less than one")); |
220e750f RH |
486 | return; |
487 | } | |
249e3833 | 488 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
220e750f | 489 | { |
0e389e77 | 490 | as_bad (_("unassigned file number %ld"), (long) filenum); |
220e750f RH |
491 | return; |
492 | } | |
493 | ||
249e3833 | 494 | current.filenum = filenum; |
220e750f RH |
495 | current.line = line; |
496 | current.column = column; | |
497 | current.flags = DWARF2_FLAG_BEGIN_STMT; | |
498 | ||
b34976b6 | 499 | loc_directive_seen = TRUE; |
220e750f RH |
500 | |
501 | #ifndef NO_LISTING | |
502 | if (listing) | |
9d66a1d9 | 503 | { |
a7ed1ca2 NC |
504 | if (files[filenum].dir) |
505 | { | |
506 | size_t dir_len = strlen (dirs[files[filenum].dir]); | |
507 | size_t file_len = strlen (files[filenum].filename); | |
508 | char *cp = (char *) alloca (dir_len + 1 + file_len + 1); | |
509 | ||
510 | memcpy (cp, dirs[files[filenum].dir], dir_len); | |
511 | cp[dir_len] = '/'; | |
512 | memcpy (cp + dir_len + 1, files[filenum].filename, file_len); | |
513 | cp[dir_len + file_len + 1] = '\0'; | |
514 | listing_source_file (cp); | |
515 | } | |
516 | else | |
517 | listing_source_file (files[filenum].filename); | |
9d66a1d9 L |
518 | listing_source_line (line); |
519 | } | |
220e750f RH |
520 | #endif |
521 | } | |
220e750f RH |
522 | \f |
523 | static struct frag * | |
a2e22468 | 524 | first_frag_for_seg (segT seg) |
220e750f RH |
525 | { |
526 | frchainS *f, *first = NULL; | |
527 | ||
ee515fb7 | 528 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
529 | if (f->frch_seg == seg |
530 | && (! first || first->frch_subseg > f->frch_subseg)) | |
531 | first = f; | |
532 | ||
533 | return first ? first->frch_root : NULL; | |
534 | } | |
535 | ||
536 | static struct frag * | |
a2e22468 | 537 | last_frag_for_seg (segT seg) |
220e750f RH |
538 | { |
539 | frchainS *f, *last = NULL; | |
540 | ||
ee515fb7 | 541 | for (f = frchain_root; f; f = f->frch_next) |
220e750f RH |
542 | if (f->frch_seg == seg |
543 | && (! last || last->frch_subseg < f->frch_subseg)) | |
544 | last= f; | |
545 | ||
546 | return last ? last->frch_last : NULL; | |
547 | } | |
548 | \f | |
549 | /* Emit a single byte into the current segment. */ | |
550 | ||
551 | static inline void | |
a2e22468 | 552 | out_byte (int byte) |
220e750f RH |
553 | { |
554 | FRAG_APPEND_1_CHAR (byte); | |
555 | } | |
556 | ||
557 | /* Emit a statement program opcode into the current segment. */ | |
558 | ||
559 | static inline void | |
a2e22468 | 560 | out_opcode (int opc) |
220e750f RH |
561 | { |
562 | out_byte (opc); | |
563 | } | |
564 | ||
565 | /* Emit a two-byte word into the current segment. */ | |
566 | ||
567 | static inline void | |
a2e22468 | 568 | out_two (int data) |
220e750f RH |
569 | { |
570 | md_number_to_chars (frag_more (2), data, 2); | |
571 | } | |
572 | ||
573 | /* Emit a four byte word into the current segment. */ | |
574 | ||
575 | static inline void | |
a2e22468 | 576 | out_four (int data) |
220e750f RH |
577 | { |
578 | md_number_to_chars (frag_more (4), data, 4); | |
579 | } | |
580 | ||
581 | /* Emit an unsigned "little-endian base 128" number. */ | |
582 | ||
fac0d250 | 583 | static void |
a2e22468 | 584 | out_uleb128 (addressT value) |
220e750f RH |
585 | { |
586 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
587 | } | |
588 | ||
589 | /* Emit a tuple for .debug_abbrev. */ | |
590 | ||
591 | static inline void | |
a2e22468 | 592 | out_abbrev (int name, int form) |
fac0d250 | 593 | { |
220e750f RH |
594 | out_uleb128 (name); |
595 | out_uleb128 (form); | |
596 | } | |
fac0d250 | 597 | |
220e750f | 598 | /* Get the size of a fragment. */ |
fac0d250 | 599 | |
220e750f | 600 | static offsetT |
a2e22468 | 601 | get_frag_fix (fragS *frag) |
220e750f RH |
602 | { |
603 | frchainS *fr; | |
604 | ||
605 | if (frag->fr_next) | |
606 | return frag->fr_fix; | |
607 | ||
608 | /* If a fragment is the last in the chain, special measures must be | |
609 | taken to find its size before relaxation, since it may be pending | |
610 | on some subsegment chain. */ | |
ee515fb7 | 611 | for (fr = frchain_root; fr; fr = fr->frch_next) |
220e750f | 612 | if (fr->frch_last == frag) |
c5c0a210 | 613 | return (char *) obstack_next_free (&fr->frch_obstack) - frag->fr_literal; |
220e750f RH |
614 | |
615 | abort (); | |
616 | } | |
fac0d250 | 617 | |
220e750f | 618 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 619 | |
220e750f | 620 | static void |
a2e22468 | 621 | out_set_addr (segT seg, fragS *frag, addressT ofs) |
220e750f RH |
622 | { |
623 | expressionS expr; | |
624 | symbolS *sym; | |
fac0d250 | 625 | |
b7d6ed97 | 626 | sym = symbol_temp_new (seg, ofs, frag); |
9e3af0e7 | 627 | |
fac0d250 | 628 | out_opcode (DW_LNS_extended_op); |
220e750f | 629 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
630 | |
631 | out_opcode (DW_LNE_set_address); | |
632 | expr.X_op = O_symbol; | |
633 | expr.X_add_symbol = sym; | |
634 | expr.X_add_number = 0; | |
220e750f | 635 | emit_expr (&expr, sizeof_address); |
fac0d250 RH |
636 | } |
637 | ||
a3b75434 | 638 | #if DWARF2_LINE_MIN_INSN_LENGTH > 1 |
a2e22468 | 639 | static void scale_addr_delta (addressT *); |
c8970b4b | 640 | |
a3b75434 | 641 | static void |
d7342424 | 642 | scale_addr_delta (addressT *addr_delta) |
a3b75434 DD |
643 | { |
644 | static int printed_this = 0; | |
645 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0) | |
646 | { | |
647 | if (!printed_this) | |
648 | as_bad("unaligned opcodes detected in executable segment"); | |
649 | printed_this = 1; | |
650 | } | |
651 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
652 | } | |
653 | #else | |
654 | #define scale_addr_delta(A) | |
655 | #endif | |
656 | ||
220e750f RH |
657 | /* Encode a pair of line and address skips as efficiently as possible. |
658 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 659 | |
220e750f RH |
660 | The following two routines *must* be kept in sync. This is |
661 | enforced by making emit_inc_line_addr abort if we do not emit | |
662 | exactly the expected number of bytes. */ | |
663 | ||
664 | static int | |
a2e22468 | 665 | size_inc_line_addr (int line_delta, addressT addr_delta) |
fac0d250 | 666 | { |
220e750f RH |
667 | unsigned int tmp, opcode; |
668 | int len = 0; | |
fac0d250 | 669 | |
220e750f | 670 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 | 671 | scale_addr_delta (&addr_delta); |
220e750f RH |
672 | |
673 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
674 | We cannot use special opcodes here, since we want the end_sequence | |
675 | to emit the matrix entry. */ | |
676 | if (line_delta == INT_MAX) | |
fac0d250 | 677 | { |
220e750f RH |
678 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
679 | len = 1; | |
fac0d250 | 680 | else |
220e750f RH |
681 | len = 1 + sizeof_leb128 (addr_delta, 0); |
682 | return len + 3; | |
fac0d250 | 683 | } |
fac0d250 | 684 | |
220e750f RH |
685 | /* Bias the line delta by the base. */ |
686 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 687 | |
220e750f RH |
688 | /* If the line increment is out of range of a special opcode, we |
689 | must encode it with DW_LNS_advance_line. */ | |
690 | if (tmp >= DWARF2_LINE_RANGE) | |
691 | { | |
692 | len = 1 + sizeof_leb128 (line_delta, 1); | |
693 | line_delta = 0; | |
694 | tmp = 0 - DWARF2_LINE_BASE; | |
695 | } | |
fac0d250 | 696 | |
220e750f RH |
697 | /* Bias the opcode by the special opcode base. */ |
698 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 699 | |
220e750f RH |
700 | /* Avoid overflow when addr_delta is large. */ |
701 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
702 | { | |
703 | /* Try using a special opcode. */ | |
704 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
705 | if (opcode <= 255) | |
706 | return len + 1; | |
707 | ||
708 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
709 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
710 | if (opcode <= 255) | |
711 | return len + 2; | |
712 | } | |
713 | ||
714 | /* Otherwise use DW_LNS_advance_pc. */ | |
715 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
716 | ||
717 | /* DW_LNS_copy or special opcode. */ | |
718 | len += 1; | |
719 | ||
720 | return len; | |
721 | } | |
fac0d250 | 722 | |
220e750f | 723 | static void |
a2e22468 | 724 | emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) |
220e750f RH |
725 | { |
726 | unsigned int tmp, opcode; | |
727 | int need_copy = 0; | |
728 | char *end = p + len; | |
fac0d250 | 729 | |
220e750f | 730 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 DD |
731 | scale_addr_delta (&addr_delta); |
732 | ||
220e750f RH |
733 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
734 | We cannot use special opcodes here, since we want the end_sequence | |
735 | to emit the matrix entry. */ | |
736 | if (line_delta == INT_MAX) | |
fac0d250 | 737 | { |
220e750f RH |
738 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
739 | *p++ = DW_LNS_const_add_pc; | |
740 | else | |
fac0d250 | 741 | { |
220e750f RH |
742 | *p++ = DW_LNS_advance_pc; |
743 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 744 | } |
220e750f RH |
745 | |
746 | *p++ = DW_LNS_extended_op; | |
747 | *p++ = 1; | |
748 | *p++ = DW_LNE_end_sequence; | |
749 | goto done; | |
fac0d250 RH |
750 | } |
751 | ||
220e750f RH |
752 | /* Bias the line delta by the base. */ |
753 | tmp = line_delta - DWARF2_LINE_BASE; | |
754 | ||
755 | /* If the line increment is out of range of a special opcode, we | |
756 | must encode it with DW_LNS_advance_line. */ | |
757 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 758 | { |
220e750f RH |
759 | *p++ = DW_LNS_advance_line; |
760 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 761 | |
220e750f RH |
762 | /* Prettier, I think, to use DW_LNS_copy instead of a |
763 | "line +0, addr +0" special opcode. */ | |
764 | if (addr_delta == 0) | |
765 | { | |
766 | *p++ = DW_LNS_copy; | |
767 | goto done; | |
768 | } | |
cb30237e | 769 | |
220e750f RH |
770 | line_delta = 0; |
771 | tmp = 0 - DWARF2_LINE_BASE; | |
772 | need_copy = 1; | |
773 | } | |
fac0d250 | 774 | |
220e750f RH |
775 | /* Bias the opcode by the special opcode base. */ |
776 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 777 | |
220e750f RH |
778 | /* Avoid overflow when addr_delta is large. */ |
779 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 780 | { |
220e750f RH |
781 | /* Try using a special opcode. */ |
782 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
783 | if (opcode <= 255) | |
784 | { | |
785 | *p++ = opcode; | |
786 | goto done; | |
787 | } | |
788 | ||
789 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
790 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
791 | if (opcode <= 255) | |
fac0d250 | 792 | { |
220e750f RH |
793 | *p++ = DW_LNS_const_add_pc; |
794 | *p++ = opcode; | |
795 | goto done; | |
fac0d250 RH |
796 | } |
797 | } | |
220e750f RH |
798 | |
799 | /* Otherwise use DW_LNS_advance_pc. */ | |
800 | *p++ = DW_LNS_advance_pc; | |
801 | p += output_leb128 (p, addr_delta, 0); | |
802 | ||
803 | if (need_copy) | |
804 | *p++ = DW_LNS_copy; | |
fac0d250 | 805 | else |
220e750f | 806 | *p++ = tmp; |
fac0d250 | 807 | |
220e750f RH |
808 | done: |
809 | assert (p == end); | |
810 | } | |
a8316fe2 | 811 | |
220e750f | 812 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 813 | |
220e750f | 814 | static void |
a2e22468 | 815 | out_inc_line_addr (int line_delta, addressT addr_delta) |
220e750f RH |
816 | { |
817 | int len = size_inc_line_addr (line_delta, addr_delta); | |
818 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
819 | } | |
9de8d8f1 | 820 | |
220e750f RH |
821 | /* Generate a variant frag that we can use to relax address/line |
822 | increments between fragments of the target segment. */ | |
9e3af0e7 | 823 | |
220e750f | 824 | static void |
a2e22468 KH |
825 | relax_inc_line_addr (int line_delta, segT seg, |
826 | fragS *to_frag, addressT to_ofs, | |
827 | fragS *from_frag, addressT from_ofs) | |
220e750f RH |
828 | { |
829 | symbolS *to_sym, *from_sym; | |
830 | expressionS expr; | |
831 | int max_chars; | |
6576f0b5 | 832 | |
b7d6ed97 RH |
833 | to_sym = symbol_temp_new (seg, to_ofs, to_frag); |
834 | from_sym = symbol_temp_new (seg, from_ofs, from_frag); | |
fac0d250 | 835 | |
220e750f RH |
836 | expr.X_op = O_subtract; |
837 | expr.X_add_symbol = to_sym; | |
838 | expr.X_op_symbol = from_sym; | |
839 | expr.X_add_number = 0; | |
fac0d250 | 840 | |
220e750f RH |
841 | /* The maximum size of the frag is the line delta with a maximum |
842 | sized address delta. */ | |
843 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 844 | |
220e750f RH |
845 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
846 | make_expr_symbol (&expr), line_delta, NULL); | |
847 | } | |
fac0d250 | 848 | |
220e750f RH |
849 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
850 | based on the current values of the symbols. It is called before | |
851 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 852 | |
220e750f | 853 | int |
a2e22468 | 854 | dwarf2dbg_estimate_size_before_relax (fragS *frag) |
220e750f RH |
855 | { |
856 | offsetT addr_delta; | |
857 | int size; | |
fac0d250 | 858 | |
6386f3a7 | 859 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
220e750f | 860 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
fac0d250 | 861 | |
220e750f | 862 | frag->fr_subtype = size; |
fac0d250 | 863 | |
220e750f RH |
864 | return size; |
865 | } | |
866 | ||
867 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
868 | current values of the symbols. fr_subtype is the current length | |
869 | of the frag. This returns the change in frag length. */ | |
870 | ||
871 | int | |
a2e22468 | 872 | dwarf2dbg_relax_frag (fragS *frag) |
220e750f RH |
873 | { |
874 | int old_size, new_size; | |
fac0d250 | 875 | |
220e750f RH |
876 | old_size = frag->fr_subtype; |
877 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 878 | |
220e750f | 879 | return new_size - old_size; |
fac0d250 RH |
880 | } |
881 | ||
220e750f RH |
882 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
883 | fill frag. This is called after all relaxation has been done. | |
884 | fr_subtype will be the desired length of the frag. */ | |
885 | ||
886 | void | |
a2e22468 | 887 | dwarf2dbg_convert_frag (fragS *frag) |
fac0d250 | 888 | { |
220e750f RH |
889 | offsetT addr_diff; |
890 | ||
6386f3a7 | 891 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
fac0d250 | 892 | |
220e750f RH |
893 | /* fr_var carries the max_chars that we created the fragment with. |
894 | fr_subtype carries the current expected length. We must, of | |
895 | course, have allocated enough memory earlier. */ | |
bccba5f0 | 896 | assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 897 | |
ee515fb7 | 898 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
220e750f RH |
899 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
900 | ||
901 | frag->fr_fix += frag->fr_subtype; | |
902 | frag->fr_type = rs_fill; | |
903 | frag->fr_var = 0; | |
904 | frag->fr_offset = 0; | |
905 | } | |
906 | ||
907 | /* Generate .debug_line content for the chain of line number entries | |
908 | beginning at E, for segment SEG. */ | |
909 | ||
910 | static void | |
a2e22468 | 911 | process_entries (segT seg, struct line_entry *e) |
220e750f RH |
912 | { |
913 | unsigned filenum = 1; | |
914 | unsigned line = 1; | |
915 | unsigned column = 0; | |
916 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; | |
917 | fragS *frag = NULL; | |
918 | fragS *last_frag; | |
919 | addressT frag_ofs = 0; | |
920 | addressT last_frag_ofs; | |
921 | struct line_entry *next; | |
922 | ||
923 | while (e) | |
fac0d250 | 924 | { |
220e750f RH |
925 | int changed = 0; |
926 | ||
927 | if (filenum != e->loc.filenum) | |
fac0d250 | 928 | { |
220e750f RH |
929 | filenum = e->loc.filenum; |
930 | out_opcode (DW_LNS_set_file); | |
931 | out_uleb128 (filenum); | |
932 | changed = 1; | |
933 | } | |
934 | ||
935 | if (column != e->loc.column) | |
936 | { | |
937 | column = e->loc.column; | |
938 | out_opcode (DW_LNS_set_column); | |
939 | out_uleb128 (column); | |
940 | changed = 1; | |
941 | } | |
942 | ||
943 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) | |
944 | { | |
945 | flags = e->loc.flags; | |
946 | out_opcode (DW_LNS_negate_stmt); | |
947 | changed = 1; | |
948 | } | |
949 | ||
950 | if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) | |
951 | { | |
952 | out_opcode (DW_LNS_set_basic_block); | |
953 | changed = 1; | |
954 | } | |
955 | ||
fb81275c JM |
956 | /* Don't try to optimize away redundant entries; gdb wants two |
957 | entries for a function where the code starts on the same line as | |
958 | the {, and there's no way to identify that case here. Trust gcc | |
959 | to optimize appropriately. */ | |
960 | if (1 /* line != e->loc.line || changed */) | |
220e750f RH |
961 | { |
962 | int line_delta = e->loc.line - line; | |
963 | if (frag == NULL) | |
fac0d250 | 964 | { |
220e750f RH |
965 | out_set_addr (seg, e->frag, e->frag_ofs); |
966 | out_inc_line_addr (line_delta, 0); | |
fac0d250 | 967 | } |
220e750f RH |
968 | else if (frag == e->frag) |
969 | out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); | |
970 | else | |
971 | relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, | |
972 | frag, frag_ofs); | |
973 | ||
974 | frag = e->frag; | |
975 | frag_ofs = e->frag_ofs; | |
976 | line = e->loc.line; | |
fac0d250 | 977 | } |
220e750f RH |
978 | else if (frag == NULL) |
979 | { | |
980 | out_set_addr (seg, e->frag, e->frag_ofs); | |
981 | frag = e->frag; | |
982 | frag_ofs = e->frag_ofs; | |
983 | } | |
984 | ||
985 | next = e->next; | |
986 | free (e); | |
987 | e = next; | |
fac0d250 | 988 | } |
353e2c69 | 989 | |
220e750f RH |
990 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
991 | last_frag = last_frag_for_seg (seg); | |
992 | last_frag_ofs = get_frag_fix (last_frag); | |
993 | if (frag == last_frag) | |
994 | out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); | |
995 | else | |
ee515fb7 | 996 | relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, |
220e750f | 997 | frag, frag_ofs); |
fac0d250 RH |
998 | } |
999 | ||
220e750f RH |
1000 | /* Emit the directory and file tables for .debug_line. */ |
1001 | ||
fac0d250 | 1002 | static void |
a2e22468 | 1003 | out_file_list (void) |
fac0d250 RH |
1004 | { |
1005 | size_t size; | |
1006 | char *cp; | |
220e750f RH |
1007 | unsigned int i; |
1008 | ||
a7ed1ca2 NC |
1009 | /* Emit directory list. */ |
1010 | for (i = 1; i < dirs_in_use; ++i) | |
1011 | { | |
1012 | size = strlen (dirs[i]) + 1; | |
1013 | cp = frag_more (size); | |
1014 | memcpy (cp, dirs[i], size); | |
1015 | } | |
1016 | /* Terminate it. */ | |
220e750f | 1017 | out_byte ('\0'); |
fac0d250 | 1018 | |
220e750f | 1019 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 1020 | { |
249e3833 RH |
1021 | if (files[i].filename == NULL) |
1022 | { | |
0e389e77 | 1023 | as_bad (_("unassigned file number %ld"), (long) i); |
88b4ca40 RH |
1024 | /* Prevent a crash later, particularly for file 1. */ |
1025 | files[i].filename = ""; | |
249e3833 RH |
1026 | continue; |
1027 | } | |
1028 | ||
220e750f | 1029 | size = strlen (files[i].filename) + 1; |
fac0d250 | 1030 | cp = frag_more (size); |
220e750f | 1031 | memcpy (cp, files[i].filename, size); |
fac0d250 | 1032 | |
220e750f | 1033 | out_uleb128 (files[i].dir); /* directory number */ |
fac0d250 RH |
1034 | out_uleb128 (0); /* last modification timestamp */ |
1035 | out_uleb128 (0); /* filesize */ | |
1036 | } | |
353e2c69 KH |
1037 | |
1038 | /* Terminate filename list. */ | |
1039 | out_byte (0); | |
fac0d250 RH |
1040 | } |
1041 | ||
220e750f RH |
1042 | /* Emit the collected .debug_line data. */ |
1043 | ||
1044 | static void | |
a2e22468 | 1045 | out_debug_line (segT line_seg) |
220e750f RH |
1046 | { |
1047 | expressionS expr; | |
1048 | symbolS *line_start; | |
1049 | symbolS *prologue_end; | |
1050 | symbolS *line_end; | |
1051 | struct line_seg *s; | |
14e777e0 KB |
1052 | enum dwarf2_format d2f; |
1053 | int sizeof_offset; | |
220e750f RH |
1054 | |
1055 | subseg_set (line_seg, 0); | |
1056 | ||
b7d6ed97 RH |
1057 | line_start = symbol_temp_new_now (); |
1058 | prologue_end = symbol_temp_make (); | |
1059 | line_end = symbol_temp_make (); | |
220e750f RH |
1060 | |
1061 | /* Total length of the information for this compilation unit. */ | |
1062 | expr.X_op = O_subtract; | |
1063 | expr.X_add_symbol = line_end; | |
1064 | expr.X_op_symbol = line_start; | |
14e777e0 KB |
1065 | |
1066 | d2f = DWARF2_FORMAT (); | |
1067 | if (d2f == dwarf2_format_32bit) | |
1068 | { | |
1069 | expr.X_add_number = -4; | |
1070 | emit_expr (&expr, 4); | |
1071 | sizeof_offset = 4; | |
1072 | } | |
1073 | else if (d2f == dwarf2_format_64bit) | |
1074 | { | |
1075 | expr.X_add_number = -12; | |
1076 | out_four (-1); | |
1077 | emit_expr (&expr, 8); | |
1078 | sizeof_offset = 8; | |
1079 | } | |
1080 | else if (d2f == dwarf2_format_64bit_irix) | |
1081 | { | |
1082 | expr.X_add_number = -8; | |
1083 | emit_expr (&expr, 8); | |
1084 | sizeof_offset = 8; | |
1085 | } | |
1086 | else | |
1087 | { | |
1088 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1089 | } | |
220e750f RH |
1090 | |
1091 | /* Version. */ | |
1092 | out_two (2); | |
1093 | ||
1094 | /* Length of the prologue following this length. */ | |
1095 | expr.X_op = O_subtract; | |
1096 | expr.X_add_symbol = prologue_end; | |
1097 | expr.X_op_symbol = line_start; | |
1098 | expr.X_add_number = - (4 + 2 + 4); | |
14e777e0 | 1099 | emit_expr (&expr, sizeof_offset); |
220e750f RH |
1100 | |
1101 | /* Parameters of the state machine. */ | |
1102 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1103 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1104 | out_byte (DWARF2_LINE_BASE); | |
1105 | out_byte (DWARF2_LINE_RANGE); | |
1106 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1107 | ||
1108 | /* Standard opcode lengths. */ | |
1109 | out_byte (0); /* DW_LNS_copy */ | |
1110 | out_byte (1); /* DW_LNS_advance_pc */ | |
1111 | out_byte (1); /* DW_LNS_advance_line */ | |
1112 | out_byte (1); /* DW_LNS_set_file */ | |
1113 | out_byte (1); /* DW_LNS_set_column */ | |
1114 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1115 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1116 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1117 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
1118 | ||
1119 | out_file_list (); | |
1120 | ||
b7d6ed97 | 1121 | symbol_set_value_now (prologue_end); |
220e750f RH |
1122 | |
1123 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1124 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1125 | process_entries (s->seg, s->head->head); |
1126 | ||
b7d6ed97 | 1127 | symbol_set_value_now (line_end); |
220e750f RH |
1128 | } |
1129 | ||
1130 | /* Emit data for .debug_aranges. */ | |
1131 | ||
58b5739a | 1132 | static void |
a2e22468 | 1133 | out_debug_aranges (segT aranges_seg, segT info_seg) |
fac0d250 | 1134 | { |
220e750f RH |
1135 | unsigned int addr_size = sizeof_address; |
1136 | addressT size, skip; | |
1137 | struct line_seg *s; | |
1138 | expressionS expr; | |
1139 | char *p; | |
fac0d250 | 1140 | |
220e750f | 1141 | size = 4 + 2 + 4 + 1 + 1; |
fac0d250 | 1142 | |
ee515fb7 KH |
1143 | skip = 2 * addr_size - (size & (2 * addr_size - 1)); |
1144 | if (skip == 2 * addr_size) | |
220e750f RH |
1145 | skip = 0; |
1146 | size += skip; | |
fac0d250 | 1147 | |
ee515fb7 KH |
1148 | for (s = all_segs; s; s = s->next) |
1149 | size += 2 * addr_size; | |
fac0d250 | 1150 | |
ee515fb7 | 1151 | size += 2 * addr_size; |
fac0d250 | 1152 | |
220e750f | 1153 | subseg_set (aranges_seg, 0); |
fac0d250 | 1154 | |
220e750f RH |
1155 | /* Length of the compilation unit. */ |
1156 | out_four (size - 4); | |
fac0d250 | 1157 | |
220e750f RH |
1158 | /* Version. */ |
1159 | out_two (2); | |
4dc7ead9 | 1160 | |
220e750f | 1161 | /* Offset to .debug_info. */ |
6174d9c8 RH |
1162 | /* ??? sizeof_offset */ |
1163 | TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), 4); | |
220e750f RH |
1164 | |
1165 | /* Size of an address (offset portion). */ | |
1166 | out_byte (addr_size); | |
1167 | ||
1168 | /* Size of a segment descriptor. */ | |
1169 | out_byte (0); | |
1170 | ||
1171 | /* Align the header. */ | |
1172 | if (skip) | |
ee515fb7 | 1173 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
4dc7ead9 | 1174 | |
ee515fb7 | 1175 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1176 | { |
1177 | fragS *frag; | |
1178 | symbolS *beg, *end; | |
1179 | ||
1180 | frag = first_frag_for_seg (s->seg); | |
b7d6ed97 | 1181 | beg = symbol_temp_new (s->seg, 0, frag); |
220e750f RH |
1182 | s->text_start = beg; |
1183 | ||
1184 | frag = last_frag_for_seg (s->seg); | |
b7d6ed97 | 1185 | end = symbol_temp_new (s->seg, get_frag_fix (frag), frag); |
220e750f RH |
1186 | s->text_end = end; |
1187 | ||
1188 | expr.X_op = O_symbol; | |
1189 | expr.X_add_symbol = beg; | |
1190 | expr.X_add_number = 0; | |
1191 | emit_expr (&expr, addr_size); | |
1192 | ||
1193 | expr.X_op = O_subtract; | |
1194 | expr.X_add_symbol = end; | |
1195 | expr.X_op_symbol = beg; | |
1196 | expr.X_add_number = 0; | |
1197 | emit_expr (&expr, addr_size); | |
1198 | } | |
4dc7ead9 | 1199 | |
220e750f RH |
1200 | p = frag_more (2 * addr_size); |
1201 | md_number_to_chars (p, 0, addr_size); | |
1202 | md_number_to_chars (p + addr_size, 0, addr_size); | |
4dc7ead9 RH |
1203 | } |
1204 | ||
220e750f RH |
1205 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1206 | sync with out_debug_info below. */ | |
fac0d250 | 1207 | |
220e750f | 1208 | static void |
a2e22468 | 1209 | out_debug_abbrev (segT abbrev_seg) |
220e750f RH |
1210 | { |
1211 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1212 | |
220e750f RH |
1213 | out_uleb128 (1); |
1214 | out_uleb128 (DW_TAG_compile_unit); | |
1215 | out_byte (DW_CHILDREN_no); | |
1216 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1217 | if (all_segs->next == NULL) | |
4dc7ead9 | 1218 | { |
220e750f RH |
1219 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
1220 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1221 | } | |
48b91938 | 1222 | out_abbrev (DW_AT_name, DW_FORM_string); |
220e750f RH |
1223 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); |
1224 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1225 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1226 | out_abbrev (0, 0); | |
a987bfc9 RH |
1227 | |
1228 | /* Terminate the abbreviations for this compilation unit. */ | |
1229 | out_byte (0); | |
220e750f | 1230 | } |
4dc7ead9 | 1231 | |
220e750f | 1232 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1233 | |
220e750f | 1234 | static void |
a2e22468 | 1235 | out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg) |
220e750f RH |
1236 | { |
1237 | char producer[128]; | |
1238 | char *comp_dir; | |
1239 | expressionS expr; | |
1240 | symbolS *info_start; | |
1241 | symbolS *info_end; | |
1242 | char *p; | |
1243 | int len; | |
14e777e0 KB |
1244 | enum dwarf2_format d2f; |
1245 | int sizeof_offset; | |
4dc7ead9 | 1246 | |
220e750f | 1247 | subseg_set (info_seg, 0); |
4dc7ead9 | 1248 | |
b7d6ed97 RH |
1249 | info_start = symbol_temp_new_now (); |
1250 | info_end = symbol_temp_make (); | |
4dc7ead9 | 1251 | |
220e750f RH |
1252 | /* Compilation Unit length. */ |
1253 | expr.X_op = O_subtract; | |
1254 | expr.X_add_symbol = info_end; | |
1255 | expr.X_op_symbol = info_start; | |
14e777e0 KB |
1256 | |
1257 | d2f = DWARF2_FORMAT (); | |
1258 | if (d2f == dwarf2_format_32bit) | |
1259 | { | |
1260 | expr.X_add_number = -4; | |
1261 | emit_expr (&expr, 4); | |
1262 | sizeof_offset = 4; | |
1263 | } | |
1264 | else if (d2f == dwarf2_format_64bit) | |
1265 | { | |
1266 | expr.X_add_number = -12; | |
1267 | out_four (-1); | |
1268 | emit_expr (&expr, 8); | |
1269 | sizeof_offset = 8; | |
1270 | } | |
1271 | else if (d2f == dwarf2_format_64bit_irix) | |
1272 | { | |
1273 | expr.X_add_number = -8; | |
1274 | emit_expr (&expr, 8); | |
1275 | sizeof_offset = 8; | |
1276 | } | |
1277 | else | |
1278 | { | |
1279 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1280 | } | |
4dc7ead9 | 1281 | |
220e750f RH |
1282 | /* DWARF version. */ |
1283 | out_two (2); | |
4dc7ead9 | 1284 | |
220e750f | 1285 | /* .debug_abbrev offset */ |
6174d9c8 | 1286 | TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); |
4dc7ead9 | 1287 | |
220e750f RH |
1288 | /* Target address size. */ |
1289 | out_byte (sizeof_address); | |
fac0d250 | 1290 | |
220e750f RH |
1291 | /* DW_TAG_compile_unit DIE abbrev */ |
1292 | out_uleb128 (1); | |
fac0d250 | 1293 | |
220e750f | 1294 | /* DW_AT_stmt_list */ |
6174d9c8 RH |
1295 | /* ??? sizeof_offset */ |
1296 | TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), 4); | |
fac0d250 | 1297 | |
220e750f RH |
1298 | /* These two attributes may only be emitted if all of the code is |
1299 | contiguous. Multiple sections are not that. */ | |
1300 | if (all_segs->next == NULL) | |
58b5739a | 1301 | { |
220e750f RH |
1302 | /* DW_AT_low_pc */ |
1303 | expr.X_op = O_symbol; | |
1304 | expr.X_add_symbol = all_segs->text_start; | |
1305 | expr.X_add_number = 0; | |
1306 | emit_expr (&expr, sizeof_address); | |
1307 | ||
1308 | /* DW_AT_high_pc */ | |
1309 | expr.X_op = O_symbol; | |
1310 | expr.X_add_symbol = all_segs->text_end; | |
1311 | expr.X_add_number = 0; | |
1312 | emit_expr (&expr, sizeof_address); | |
58b5739a RH |
1313 | } |
1314 | ||
48b91938 RH |
1315 | /* DW_AT_name. We don't have the actual file name that was present |
1316 | on the command line, so assume files[1] is the main input file. | |
1317 | We're not supposed to get called unless at least one line number | |
1318 | entry was emitted, so this should always be defined. */ | |
1319 | if (!files || files_in_use < 1) | |
1320 | abort (); | |
a7ed1ca2 NC |
1321 | if (files[1].dir) |
1322 | { | |
1323 | len = strlen (dirs[files[1].dir]); | |
1324 | p = frag_more (len + 1); | |
1325 | memcpy (p, dirs[files[1].dir], len); | |
1326 | p[len] = '/'; | |
1327 | } | |
48b91938 RH |
1328 | len = strlen (files[1].filename) + 1; |
1329 | p = frag_more (len); | |
1330 | memcpy (p, files[1].filename, len); | |
1331 | ||
220e750f RH |
1332 | /* DW_AT_comp_dir */ |
1333 | comp_dir = getpwd (); | |
1334 | len = strlen (comp_dir) + 1; | |
1335 | p = frag_more (len); | |
1336 | memcpy (p, comp_dir, len); | |
fac0d250 | 1337 | |
220e750f RH |
1338 | /* DW_AT_producer */ |
1339 | sprintf (producer, "GNU AS %s", VERSION); | |
1340 | len = strlen (producer) + 1; | |
1341 | p = frag_more (len); | |
1342 | memcpy (p, producer, len); | |
fac0d250 | 1343 | |
220e750f RH |
1344 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1345 | dwarf2 draft has no standard code for assembler. */ | |
1346 | out_two (DW_LANG_Mips_Assembler); | |
1347 | ||
b7d6ed97 | 1348 | symbol_set_value_now (info_end); |
fac0d250 RH |
1349 | } |
1350 | ||
c6cb92c5 NS |
1351 | /* Finish the dwarf2 debug sections. We emit .debug.line if there |
1352 | were any .file/.loc directives, or --gdwarf2 was given, or if the | |
1353 | file has a non-empty .debug_info section. If we emit .debug_line, | |
1354 | and the .debug_info section is empty, we also emit .debug_info, | |
1355 | .debug_aranges and .debug_abbrev. ALL_SEGS will be non-null if | |
1356 | there were any .file/.loc directives, or --gdwarf2 was given and | |
1357 | there were any located instructions emitted. */ | |
1358 | ||
fac0d250 | 1359 | void |
a2e22468 | 1360 | dwarf2_finish (void) |
fac0d250 | 1361 | { |
220e750f RH |
1362 | segT line_seg; |
1363 | struct line_seg *s; | |
c6cb92c5 NS |
1364 | segT info_seg; |
1365 | int emit_other_sections = 0; | |
1366 | ||
1367 | info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); | |
1368 | emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg); | |
fac0d250 | 1369 | |
c6cb92c5 NS |
1370 | if (!all_segs && emit_other_sections) |
1371 | /* There is no line information and no non-empty .debug_info | |
1372 | section. */ | |
220e750f | 1373 | return; |
fac0d250 | 1374 | |
220e750f | 1375 | /* Calculate the size of an address for the target machine. */ |
9605f328 | 1376 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput); |
fac0d250 | 1377 | |
220e750f RH |
1378 | /* Create and switch to the line number section. */ |
1379 | line_seg = subseg_new (".debug_line", 0); | |
8a7140c3 | 1380 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING); |
fac0d250 | 1381 | |
220e750f | 1382 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1383 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1384 | { |
220e750f RH |
1385 | struct line_subseg *ss = s->head; |
1386 | struct line_entry **ptail = ss->ptail; | |
1387 | ||
1388 | while ((ss = ss->next) != NULL) | |
1389 | { | |
1390 | *ptail = ss->head; | |
1391 | ptail = ss->ptail; | |
1392 | } | |
fac0d250 | 1393 | } |
85a39694 | 1394 | |
220e750f | 1395 | out_debug_line (line_seg); |
85a39694 | 1396 | |
c6cb92c5 NS |
1397 | /* If this is assembler generated line info, and there is no |
1398 | debug_info already, we need .debug_info and .debug_abbrev | |
1399 | sections as well. */ | |
1400 | if (emit_other_sections) | |
220e750f RH |
1401 | { |
1402 | segT abbrev_seg; | |
220e750f | 1403 | segT aranges_seg; |
4dc7ead9 | 1404 | |
c6cb92c5 NS |
1405 | assert (all_segs); |
1406 | ||
220e750f RH |
1407 | info_seg = subseg_new (".debug_info", 0); |
1408 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1409 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1410 | |
8a7140c3 NC |
1411 | bfd_set_section_flags (stdoutput, info_seg, |
1412 | SEC_READONLY | SEC_DEBUGGING); | |
1413 | bfd_set_section_flags (stdoutput, abbrev_seg, | |
1414 | SEC_READONLY | SEC_DEBUGGING); | |
1415 | bfd_set_section_flags (stdoutput, aranges_seg, | |
1416 | SEC_READONLY | SEC_DEBUGGING); | |
ef99799a | 1417 | |
ee515fb7 | 1418 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1419 | |
220e750f RH |
1420 | out_debug_aranges (aranges_seg, info_seg); |
1421 | out_debug_abbrev (abbrev_seg); | |
1422 | out_debug_info (info_seg, abbrev_seg, line_seg); | |
1423 | } | |
85a39694 | 1424 | } |