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252b5132 | 1 | /* rddbg.c -- Read debugging information into a generic form. |
f3931575 | 2 | Copyright 1995, 1996, 1997, 2000, 2002 Free Software Foundation, Inc. |
252b5132 RH |
3 | Written by Ian Lance Taylor <ian@cygnus.com>. |
4 | ||
5 | This file is part of GNU Binutils. | |
6 | ||
7 | This program 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 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program 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 this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | /* This file reads debugging information into a generic form. This | |
23 | file knows how to dig the debugging information out of an object | |
24 | file. */ | |
25 | ||
26 | #include "bfd.h" | |
27 | #include "bucomm.h" | |
28 | #include "libiberty.h" | |
29 | #include "debug.h" | |
30 | #include "budbg.h" | |
31 | ||
32 | static boolean read_section_stabs_debugging_info | |
33 | PARAMS ((bfd *, asymbol **, long, PTR, boolean *)); | |
34 | static boolean read_symbol_stabs_debugging_info | |
35 | PARAMS ((bfd *, asymbol **, long, PTR, boolean *)); | |
36 | static boolean read_ieee_debugging_info PARAMS ((bfd *, PTR, boolean *)); | |
37 | static void save_stab PARAMS ((int, int, bfd_vma, const char *)); | |
38 | static void stab_context PARAMS ((void)); | |
39 | static void free_saved_stabs PARAMS ((void)); | |
40 | ||
41 | /* Read debugging information from a BFD. Returns a generic debugging | |
42 | pointer. */ | |
43 | ||
44 | PTR | |
45 | read_debugging_info (abfd, syms, symcount) | |
46 | bfd *abfd; | |
47 | asymbol **syms; | |
48 | long symcount; | |
49 | { | |
50 | PTR dhandle; | |
51 | boolean found; | |
52 | ||
53 | dhandle = debug_init (); | |
54 | if (dhandle == NULL) | |
55 | return NULL; | |
56 | ||
57 | if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle, | |
58 | &found)) | |
59 | return NULL; | |
60 | ||
61 | if (bfd_get_flavour (abfd) == bfd_target_aout_flavour) | |
62 | { | |
63 | if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle, | |
64 | &found)) | |
65 | return NULL; | |
66 | } | |
67 | ||
68 | if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour) | |
69 | { | |
70 | if (! read_ieee_debugging_info (abfd, dhandle, &found)) | |
71 | return NULL; | |
72 | } | |
73 | ||
74 | /* Try reading the COFF symbols if we didn't find any stabs in COFF | |
75 | sections. */ | |
76 | if (! found | |
77 | && bfd_get_flavour (abfd) == bfd_target_coff_flavour | |
78 | && symcount > 0) | |
79 | { | |
80 | if (! parse_coff (abfd, syms, symcount, dhandle)) | |
81 | return NULL; | |
82 | found = true; | |
83 | } | |
84 | ||
85 | if (! found) | |
86 | { | |
37cc8ec1 AM |
87 | non_fatal (_("%s: no recognized debugging information"), |
88 | bfd_get_filename (abfd)); | |
252b5132 RH |
89 | return NULL; |
90 | } | |
91 | ||
92 | return dhandle; | |
93 | } | |
94 | ||
95 | /* Read stabs in sections debugging information from a BFD. */ | |
96 | ||
97 | static boolean | |
98 | read_section_stabs_debugging_info (abfd, syms, symcount, dhandle, pfound) | |
99 | bfd *abfd; | |
100 | asymbol **syms; | |
101 | long symcount; | |
102 | PTR dhandle; | |
103 | boolean *pfound; | |
104 | { | |
105 | static struct | |
106 | { | |
107 | const char *secname; | |
108 | const char *strsecname; | |
f3931575 AM |
109 | } names[] = { { ".stab", ".stabstr" }, |
110 | { "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" } }; | |
252b5132 RH |
111 | unsigned int i; |
112 | PTR shandle; | |
113 | ||
114 | *pfound = false; | |
115 | shandle = NULL; | |
116 | ||
117 | for (i = 0; i < sizeof names / sizeof names[0]; i++) | |
118 | { | |
119 | asection *sec, *strsec; | |
120 | ||
121 | sec = bfd_get_section_by_name (abfd, names[i].secname); | |
122 | strsec = bfd_get_section_by_name (abfd, names[i].strsecname); | |
123 | if (sec != NULL && strsec != NULL) | |
124 | { | |
125 | bfd_size_type stabsize, strsize; | |
126 | bfd_byte *stabs, *strings; | |
127 | bfd_byte *stab; | |
128 | bfd_size_type stroff, next_stroff; | |
129 | ||
130 | stabsize = bfd_section_size (abfd, sec); | |
131 | stabs = (bfd_byte *) xmalloc (stabsize); | |
132 | if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize)) | |
133 | { | |
134 | fprintf (stderr, "%s: %s: %s\n", | |
135 | bfd_get_filename (abfd), names[i].secname, | |
136 | bfd_errmsg (bfd_get_error ())); | |
137 | return false; | |
138 | } | |
139 | ||
140 | strsize = bfd_section_size (abfd, strsec); | |
141 | strings = (bfd_byte *) xmalloc (strsize); | |
142 | if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize)) | |
143 | { | |
144 | fprintf (stderr, "%s: %s: %s\n", | |
145 | bfd_get_filename (abfd), names[i].strsecname, | |
146 | bfd_errmsg (bfd_get_error ())); | |
147 | return false; | |
148 | } | |
149 | ||
150 | if (shandle == NULL) | |
151 | { | |
152 | shandle = start_stab (dhandle, abfd, true, syms, symcount); | |
153 | if (shandle == NULL) | |
154 | return false; | |
155 | } | |
156 | ||
157 | *pfound = true; | |
158 | ||
159 | stroff = 0; | |
160 | next_stroff = 0; | |
161 | for (stab = stabs; stab < stabs + stabsize; stab += 12) | |
162 | { | |
37cc8ec1 | 163 | unsigned int strx; |
252b5132 RH |
164 | int type; |
165 | int other; | |
166 | int desc; | |
167 | bfd_vma value; | |
168 | ||
169 | /* This code presumes 32 bit values. */ | |
170 | ||
171 | strx = bfd_get_32 (abfd, stab); | |
172 | type = bfd_get_8 (abfd, stab + 4); | |
173 | other = bfd_get_8 (abfd, stab + 5); | |
174 | desc = bfd_get_16 (abfd, stab + 6); | |
175 | value = bfd_get_32 (abfd, stab + 8); | |
176 | ||
177 | if (type == 0) | |
178 | { | |
179 | /* Special type 0 stabs indicate the offset to the | |
f3931575 | 180 | next string table. */ |
252b5132 RH |
181 | stroff = next_stroff; |
182 | next_stroff += value; | |
183 | } | |
184 | else | |
185 | { | |
186 | char *f, *s; | |
187 | ||
188 | f = NULL; | |
53c7db4b | 189 | |
3b7aaf81 NC |
190 | if (stroff + strx > strsize) |
191 | { | |
192 | fprintf (stderr, "%s: %s: stab entry %d is corrupt, strx = 0x%x, type = %d\n", | |
193 | bfd_get_filename (abfd), names[i].secname, | |
194 | (stab - stabs) / 12, strx, type); | |
195 | continue; | |
196 | } | |
53c7db4b | 197 | |
252b5132 | 198 | s = (char *) strings + stroff + strx; |
53c7db4b | 199 | |
252b5132 RH |
200 | while (s[strlen (s) - 1] == '\\' |
201 | && stab + 12 < stabs + stabsize) | |
202 | { | |
203 | char *p; | |
204 | ||
205 | stab += 12; | |
206 | p = s + strlen (s) - 1; | |
207 | *p = '\0'; | |
208 | s = concat (s, | |
209 | ((char *) strings | |
210 | + stroff | |
211 | + bfd_get_32 (abfd, stab)), | |
212 | (const char *) NULL); | |
213 | ||
214 | /* We have to restore the backslash, because, if | |
f3931575 AM |
215 | the linker is hashing stabs strings, we may |
216 | see the same string more than once. */ | |
252b5132 RH |
217 | *p = '\\'; |
218 | ||
219 | if (f != NULL) | |
220 | free (f); | |
221 | f = s; | |
222 | } | |
223 | ||
224 | save_stab (type, desc, value, s); | |
225 | ||
226 | if (! parse_stab (dhandle, shandle, type, desc, value, s)) | |
227 | { | |
228 | stab_context (); | |
229 | free_saved_stabs (); | |
230 | return false; | |
231 | } | |
232 | ||
233 | /* Don't free f, since I think the stabs code | |
f3931575 AM |
234 | expects strings to hang around. This should be |
235 | straightened out. FIXME. */ | |
252b5132 RH |
236 | } |
237 | } | |
238 | ||
239 | free_saved_stabs (); | |
240 | free (stabs); | |
241 | ||
242 | /* Don't free strings, since I think the stabs code expects | |
f3931575 AM |
243 | the strings to hang around. This should be straightened |
244 | out. FIXME. */ | |
252b5132 RH |
245 | } |
246 | } | |
247 | ||
248 | if (shandle != NULL) | |
249 | { | |
250 | if (! finish_stab (dhandle, shandle)) | |
251 | return false; | |
252 | } | |
253 | ||
254 | return true; | |
255 | } | |
256 | ||
257 | /* Read stabs in the symbol table. */ | |
258 | ||
259 | static boolean | |
260 | read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle, pfound) | |
261 | bfd *abfd; | |
262 | asymbol **syms; | |
263 | long symcount; | |
264 | PTR dhandle; | |
265 | boolean *pfound; | |
266 | { | |
267 | PTR shandle; | |
268 | asymbol **ps, **symend; | |
269 | ||
270 | shandle = NULL; | |
271 | symend = syms + symcount; | |
272 | for (ps = syms; ps < symend; ps++) | |
273 | { | |
274 | symbol_info i; | |
275 | ||
276 | bfd_get_symbol_info (abfd, *ps, &i); | |
277 | ||
278 | if (i.type == '-') | |
279 | { | |
280 | const char *s; | |
281 | char *f; | |
282 | ||
283 | if (shandle == NULL) | |
284 | { | |
285 | shandle = start_stab (dhandle, abfd, false, syms, symcount); | |
286 | if (shandle == NULL) | |
287 | return false; | |
288 | } | |
289 | ||
290 | *pfound = true; | |
291 | ||
292 | s = i.name; | |
293 | f = NULL; | |
294 | while (s[strlen (s) - 1] == '\\' | |
295 | && ps + 1 < symend) | |
296 | { | |
297 | char *sc, *n; | |
298 | ||
299 | ++ps; | |
300 | sc = xstrdup (s); | |
301 | sc[strlen (sc) - 1] = '\0'; | |
302 | n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL); | |
303 | free (sc); | |
304 | if (f != NULL) | |
305 | free (f); | |
306 | f = n; | |
307 | s = n; | |
308 | } | |
309 | ||
310 | save_stab (i.stab_type, i.stab_desc, i.value, s); | |
311 | ||
312 | if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc, | |
313 | i.value, s)) | |
314 | { | |
315 | stab_context (); | |
316 | free_saved_stabs (); | |
317 | return false; | |
318 | } | |
319 | ||
320 | /* Don't free f, since I think the stabs code expects | |
321 | strings to hang around. This should be straightened out. | |
322 | FIXME. */ | |
323 | } | |
324 | } | |
325 | ||
326 | free_saved_stabs (); | |
327 | ||
328 | if (shandle != NULL) | |
329 | { | |
330 | if (! finish_stab (dhandle, shandle)) | |
331 | return false; | |
332 | } | |
333 | ||
334 | return true; | |
335 | } | |
336 | ||
337 | /* Read IEEE debugging information. */ | |
338 | ||
339 | static boolean | |
340 | read_ieee_debugging_info (abfd, dhandle, pfound) | |
341 | bfd *abfd; | |
342 | PTR dhandle; | |
343 | boolean *pfound; | |
344 | { | |
345 | asection *dsec; | |
346 | bfd_size_type size; | |
347 | bfd_byte *contents; | |
348 | ||
349 | /* The BFD backend puts the debugging information into a section | |
350 | named .debug. */ | |
351 | ||
352 | dsec = bfd_get_section_by_name (abfd, ".debug"); | |
353 | if (dsec == NULL) | |
354 | return true; | |
355 | ||
356 | size = bfd_section_size (abfd, dsec); | |
357 | contents = (bfd_byte *) xmalloc (size); | |
358 | if (! bfd_get_section_contents (abfd, dsec, contents, 0, size)) | |
359 | return false; | |
360 | ||
361 | if (! parse_ieee (dhandle, abfd, contents, size)) | |
362 | return false; | |
363 | ||
364 | free (contents); | |
365 | ||
366 | *pfound = true; | |
367 | ||
368 | return true; | |
369 | } | |
370 | \f | |
371 | /* Record stabs strings, so that we can give some context for errors. */ | |
372 | ||
373 | #define SAVE_STABS_COUNT (16) | |
374 | ||
375 | struct saved_stab | |
376 | { | |
377 | int type; | |
378 | int desc; | |
379 | bfd_vma value; | |
380 | char *string; | |
381 | }; | |
382 | ||
383 | static struct saved_stab saved_stabs[SAVE_STABS_COUNT]; | |
384 | static int saved_stabs_index; | |
385 | ||
386 | /* Save a stabs string. */ | |
387 | ||
388 | static void | |
389 | save_stab (type, desc, value, string) | |
390 | int type; | |
391 | int desc; | |
392 | bfd_vma value; | |
393 | const char *string; | |
394 | { | |
395 | if (saved_stabs[saved_stabs_index].string != NULL) | |
396 | free (saved_stabs[saved_stabs_index].string); | |
397 | saved_stabs[saved_stabs_index].type = type; | |
398 | saved_stabs[saved_stabs_index].desc = desc; | |
399 | saved_stabs[saved_stabs_index].value = value; | |
400 | saved_stabs[saved_stabs_index].string = xstrdup (string); | |
401 | saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT; | |
402 | } | |
403 | ||
404 | /* Provide context for an error. */ | |
405 | ||
406 | static void | |
407 | stab_context () | |
408 | { | |
409 | int i; | |
410 | ||
411 | fprintf (stderr, _("Last stabs entries before error:\n")); | |
412 | fprintf (stderr, "n_type n_desc n_value string\n"); | |
413 | ||
414 | i = saved_stabs_index; | |
415 | do | |
416 | { | |
417 | struct saved_stab *stabp; | |
418 | ||
419 | stabp = saved_stabs + i; | |
420 | if (stabp->string != NULL) | |
421 | { | |
422 | const char *s; | |
423 | ||
424 | s = bfd_get_stab_name (stabp->type); | |
425 | if (s != NULL) | |
426 | fprintf (stderr, "%-6s", s); | |
427 | else if (stabp->type == 0) | |
428 | fprintf (stderr, "HdrSym"); | |
429 | else | |
430 | fprintf (stderr, "%-6d", stabp->type); | |
431 | fprintf (stderr, " %-6d ", stabp->desc); | |
432 | fprintf_vma (stderr, stabp->value); | |
433 | if (stabp->type != 0) | |
434 | fprintf (stderr, " %s", stabp->string); | |
435 | fprintf (stderr, "\n"); | |
436 | } | |
437 | i = (i + 1) % SAVE_STABS_COUNT; | |
438 | } | |
439 | while (i != saved_stabs_index); | |
440 | } | |
441 | ||
442 | /* Free the saved stab strings. */ | |
443 | ||
444 | static void | |
445 | free_saved_stabs () | |
446 | { | |
447 | int i; | |
448 | ||
449 | for (i = 0; i < SAVE_STABS_COUNT; i++) | |
450 | { | |
451 | if (saved_stabs[i].string != NULL) | |
452 | { | |
453 | free (saved_stabs[i].string); | |
454 | saved_stabs[i].string = NULL; | |
455 | } | |
456 | } | |
457 | ||
458 | saved_stabs_index = 0; | |
459 | } |