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252b5132 | 1 | /* rddbg.c -- Read debugging information into a generic form. |
2da42df6 AJ |
2 | Copyright 1995, 1996, 1997, 2000, 2002, 2003 |
3 | Free Software Foundation, Inc. | |
252b5132 RH |
4 | Written by Ian Lance Taylor <ian@cygnus.com>. |
5 | ||
6 | This file is part of GNU Binutils. | |
7 | ||
8 | This program 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 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program 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 this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
21 | 02111-1307, USA. */ | |
22 | ||
23 | /* This file reads debugging information into a generic form. This | |
24 | file knows how to dig the debugging information out of an object | |
25 | file. */ | |
26 | ||
27 | #include "bfd.h" | |
28 | #include "bucomm.h" | |
29 | #include "libiberty.h" | |
30 | #include "debug.h" | |
31 | #include "budbg.h" | |
32 | ||
b34976b6 | 33 | static bfd_boolean read_section_stabs_debugging_info |
2da42df6 | 34 | (bfd *, asymbol **, long, void *, bfd_boolean *); |
b34976b6 | 35 | static bfd_boolean read_symbol_stabs_debugging_info |
2da42df6 AJ |
36 | (bfd *, asymbol **, long, void *, bfd_boolean *); |
37 | static bfd_boolean read_ieee_debugging_info (bfd *, void *, bfd_boolean *); | |
38 | static void save_stab (int, int, bfd_vma, const char *); | |
39 | static void stab_context (void); | |
40 | static void free_saved_stabs (void); | |
252b5132 RH |
41 | |
42 | /* Read debugging information from a BFD. Returns a generic debugging | |
43 | pointer. */ | |
44 | ||
2da42df6 AJ |
45 | void * |
46 | read_debugging_info (bfd *abfd, asymbol **syms, long symcount) | |
252b5132 | 47 | { |
2da42df6 | 48 | void *dhandle; |
b34976b6 | 49 | bfd_boolean found; |
252b5132 RH |
50 | |
51 | dhandle = debug_init (); | |
52 | if (dhandle == NULL) | |
53 | return NULL; | |
54 | ||
55 | if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle, | |
56 | &found)) | |
57 | return NULL; | |
58 | ||
59 | if (bfd_get_flavour (abfd) == bfd_target_aout_flavour) | |
60 | { | |
61 | if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle, | |
62 | &found)) | |
63 | return NULL; | |
64 | } | |
65 | ||
66 | if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour) | |
67 | { | |
68 | if (! read_ieee_debugging_info (abfd, dhandle, &found)) | |
69 | return NULL; | |
70 | } | |
71 | ||
72 | /* Try reading the COFF symbols if we didn't find any stabs in COFF | |
73 | sections. */ | |
74 | if (! found | |
75 | && bfd_get_flavour (abfd) == bfd_target_coff_flavour | |
76 | && symcount > 0) | |
77 | { | |
78 | if (! parse_coff (abfd, syms, symcount, dhandle)) | |
79 | return NULL; | |
b34976b6 | 80 | found = TRUE; |
252b5132 RH |
81 | } |
82 | ||
83 | if (! found) | |
84 | { | |
37cc8ec1 AM |
85 | non_fatal (_("%s: no recognized debugging information"), |
86 | bfd_get_filename (abfd)); | |
252b5132 RH |
87 | return NULL; |
88 | } | |
89 | ||
90 | return dhandle; | |
91 | } | |
92 | ||
93 | /* Read stabs in sections debugging information from a BFD. */ | |
94 | ||
b34976b6 | 95 | static bfd_boolean |
2da42df6 AJ |
96 | read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount, |
97 | void *dhandle, bfd_boolean *pfound) | |
252b5132 RH |
98 | { |
99 | static struct | |
100 | { | |
101 | const char *secname; | |
102 | const char *strsecname; | |
f3931575 AM |
103 | } names[] = { { ".stab", ".stabstr" }, |
104 | { "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" } }; | |
252b5132 | 105 | unsigned int i; |
2da42df6 | 106 | void *shandle; |
252b5132 | 107 | |
b34976b6 | 108 | *pfound = FALSE; |
252b5132 RH |
109 | shandle = NULL; |
110 | ||
111 | for (i = 0; i < sizeof names / sizeof names[0]; i++) | |
112 | { | |
113 | asection *sec, *strsec; | |
114 | ||
115 | sec = bfd_get_section_by_name (abfd, names[i].secname); | |
116 | strsec = bfd_get_section_by_name (abfd, names[i].strsecname); | |
117 | if (sec != NULL && strsec != NULL) | |
118 | { | |
119 | bfd_size_type stabsize, strsize; | |
120 | bfd_byte *stabs, *strings; | |
121 | bfd_byte *stab; | |
122 | bfd_size_type stroff, next_stroff; | |
123 | ||
124 | stabsize = bfd_section_size (abfd, sec); | |
125 | stabs = (bfd_byte *) xmalloc (stabsize); | |
126 | if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize)) | |
127 | { | |
128 | fprintf (stderr, "%s: %s: %s\n", | |
129 | bfd_get_filename (abfd), names[i].secname, | |
130 | bfd_errmsg (bfd_get_error ())); | |
b34976b6 | 131 | return FALSE; |
252b5132 RH |
132 | } |
133 | ||
134 | strsize = bfd_section_size (abfd, strsec); | |
135 | strings = (bfd_byte *) xmalloc (strsize); | |
136 | if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize)) | |
137 | { | |
138 | fprintf (stderr, "%s: %s: %s\n", | |
139 | bfd_get_filename (abfd), names[i].strsecname, | |
140 | bfd_errmsg (bfd_get_error ())); | |
b34976b6 | 141 | return FALSE; |
252b5132 RH |
142 | } |
143 | ||
144 | if (shandle == NULL) | |
145 | { | |
b34976b6 | 146 | shandle = start_stab (dhandle, abfd, TRUE, syms, symcount); |
252b5132 | 147 | if (shandle == NULL) |
b34976b6 | 148 | return FALSE; |
252b5132 RH |
149 | } |
150 | ||
b34976b6 | 151 | *pfound = TRUE; |
252b5132 RH |
152 | |
153 | stroff = 0; | |
154 | next_stroff = 0; | |
155 | for (stab = stabs; stab < stabs + stabsize; stab += 12) | |
156 | { | |
37cc8ec1 | 157 | unsigned int strx; |
252b5132 RH |
158 | int type; |
159 | int other; | |
160 | int desc; | |
161 | bfd_vma value; | |
162 | ||
163 | /* This code presumes 32 bit values. */ | |
164 | ||
165 | strx = bfd_get_32 (abfd, stab); | |
166 | type = bfd_get_8 (abfd, stab + 4); | |
167 | other = bfd_get_8 (abfd, stab + 5); | |
168 | desc = bfd_get_16 (abfd, stab + 6); | |
169 | value = bfd_get_32 (abfd, stab + 8); | |
170 | ||
171 | if (type == 0) | |
172 | { | |
173 | /* Special type 0 stabs indicate the offset to the | |
f3931575 | 174 | next string table. */ |
252b5132 RH |
175 | stroff = next_stroff; |
176 | next_stroff += value; | |
177 | } | |
178 | else | |
179 | { | |
180 | char *f, *s; | |
181 | ||
182 | f = NULL; | |
53c7db4b | 183 | |
3b7aaf81 NC |
184 | if (stroff + strx > strsize) |
185 | { | |
22d82235 | 186 | fprintf (stderr, "%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n", |
3b7aaf81 | 187 | bfd_get_filename (abfd), names[i].secname, |
22d82235 | 188 | (long) (stab - stabs) / 12, strx, type); |
3b7aaf81 NC |
189 | continue; |
190 | } | |
53c7db4b | 191 | |
252b5132 | 192 | s = (char *) strings + stroff + strx; |
53c7db4b | 193 | |
252b5132 RH |
194 | while (s[strlen (s) - 1] == '\\' |
195 | && stab + 12 < stabs + stabsize) | |
196 | { | |
197 | char *p; | |
198 | ||
199 | stab += 12; | |
200 | p = s + strlen (s) - 1; | |
201 | *p = '\0'; | |
202 | s = concat (s, | |
203 | ((char *) strings | |
204 | + stroff | |
205 | + bfd_get_32 (abfd, stab)), | |
206 | (const char *) NULL); | |
207 | ||
208 | /* We have to restore the backslash, because, if | |
f3931575 AM |
209 | the linker is hashing stabs strings, we may |
210 | see the same string more than once. */ | |
252b5132 RH |
211 | *p = '\\'; |
212 | ||
213 | if (f != NULL) | |
214 | free (f); | |
215 | f = s; | |
216 | } | |
217 | ||
218 | save_stab (type, desc, value, s); | |
219 | ||
220 | if (! parse_stab (dhandle, shandle, type, desc, value, s)) | |
221 | { | |
222 | stab_context (); | |
223 | free_saved_stabs (); | |
b34976b6 | 224 | return FALSE; |
252b5132 RH |
225 | } |
226 | ||
227 | /* Don't free f, since I think the stabs code | |
f3931575 AM |
228 | expects strings to hang around. This should be |
229 | straightened out. FIXME. */ | |
252b5132 RH |
230 | } |
231 | } | |
232 | ||
233 | free_saved_stabs (); | |
234 | free (stabs); | |
235 | ||
236 | /* Don't free strings, since I think the stabs code expects | |
f3931575 AM |
237 | the strings to hang around. This should be straightened |
238 | out. FIXME. */ | |
252b5132 RH |
239 | } |
240 | } | |
241 | ||
242 | if (shandle != NULL) | |
243 | { | |
244 | if (! finish_stab (dhandle, shandle)) | |
b34976b6 | 245 | return FALSE; |
252b5132 RH |
246 | } |
247 | ||
b34976b6 | 248 | return TRUE; |
252b5132 RH |
249 | } |
250 | ||
251 | /* Read stabs in the symbol table. */ | |
252 | ||
b34976b6 | 253 | static bfd_boolean |
2da42df6 AJ |
254 | read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount, |
255 | void *dhandle, bfd_boolean *pfound) | |
252b5132 | 256 | { |
2da42df6 | 257 | void *shandle; |
252b5132 RH |
258 | asymbol **ps, **symend; |
259 | ||
260 | shandle = NULL; | |
261 | symend = syms + symcount; | |
262 | for (ps = syms; ps < symend; ps++) | |
263 | { | |
264 | symbol_info i; | |
265 | ||
266 | bfd_get_symbol_info (abfd, *ps, &i); | |
267 | ||
268 | if (i.type == '-') | |
269 | { | |
270 | const char *s; | |
271 | char *f; | |
272 | ||
273 | if (shandle == NULL) | |
274 | { | |
b34976b6 | 275 | shandle = start_stab (dhandle, abfd, FALSE, syms, symcount); |
252b5132 | 276 | if (shandle == NULL) |
b34976b6 | 277 | return FALSE; |
252b5132 RH |
278 | } |
279 | ||
b34976b6 | 280 | *pfound = TRUE; |
252b5132 RH |
281 | |
282 | s = i.name; | |
283 | f = NULL; | |
284 | while (s[strlen (s) - 1] == '\\' | |
285 | && ps + 1 < symend) | |
286 | { | |
287 | char *sc, *n; | |
288 | ||
289 | ++ps; | |
290 | sc = xstrdup (s); | |
291 | sc[strlen (sc) - 1] = '\0'; | |
292 | n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL); | |
293 | free (sc); | |
294 | if (f != NULL) | |
295 | free (f); | |
296 | f = n; | |
297 | s = n; | |
298 | } | |
299 | ||
300 | save_stab (i.stab_type, i.stab_desc, i.value, s); | |
301 | ||
302 | if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc, | |
303 | i.value, s)) | |
304 | { | |
305 | stab_context (); | |
306 | free_saved_stabs (); | |
b34976b6 | 307 | return FALSE; |
252b5132 RH |
308 | } |
309 | ||
310 | /* Don't free f, since I think the stabs code expects | |
311 | strings to hang around. This should be straightened out. | |
312 | FIXME. */ | |
313 | } | |
314 | } | |
315 | ||
316 | free_saved_stabs (); | |
317 | ||
318 | if (shandle != NULL) | |
319 | { | |
320 | if (! finish_stab (dhandle, shandle)) | |
b34976b6 | 321 | return FALSE; |
252b5132 RH |
322 | } |
323 | ||
b34976b6 | 324 | return TRUE; |
252b5132 RH |
325 | } |
326 | ||
327 | /* Read IEEE debugging information. */ | |
328 | ||
b34976b6 | 329 | static bfd_boolean |
2da42df6 | 330 | read_ieee_debugging_info (bfd *abfd, void *dhandle, bfd_boolean *pfound) |
252b5132 RH |
331 | { |
332 | asection *dsec; | |
333 | bfd_size_type size; | |
334 | bfd_byte *contents; | |
335 | ||
336 | /* The BFD backend puts the debugging information into a section | |
337 | named .debug. */ | |
338 | ||
339 | dsec = bfd_get_section_by_name (abfd, ".debug"); | |
340 | if (dsec == NULL) | |
b34976b6 | 341 | return TRUE; |
252b5132 RH |
342 | |
343 | size = bfd_section_size (abfd, dsec); | |
344 | contents = (bfd_byte *) xmalloc (size); | |
345 | if (! bfd_get_section_contents (abfd, dsec, contents, 0, size)) | |
b34976b6 | 346 | return FALSE; |
252b5132 RH |
347 | |
348 | if (! parse_ieee (dhandle, abfd, contents, size)) | |
b34976b6 | 349 | return FALSE; |
252b5132 RH |
350 | |
351 | free (contents); | |
352 | ||
b34976b6 | 353 | *pfound = TRUE; |
252b5132 | 354 | |
b34976b6 | 355 | return TRUE; |
252b5132 RH |
356 | } |
357 | \f | |
358 | /* Record stabs strings, so that we can give some context for errors. */ | |
359 | ||
360 | #define SAVE_STABS_COUNT (16) | |
361 | ||
362 | struct saved_stab | |
363 | { | |
364 | int type; | |
365 | int desc; | |
366 | bfd_vma value; | |
367 | char *string; | |
368 | }; | |
369 | ||
370 | static struct saved_stab saved_stabs[SAVE_STABS_COUNT]; | |
371 | static int saved_stabs_index; | |
372 | ||
373 | /* Save a stabs string. */ | |
374 | ||
375 | static void | |
2da42df6 | 376 | save_stab (int type, int desc, bfd_vma value, const char *string) |
252b5132 RH |
377 | { |
378 | if (saved_stabs[saved_stabs_index].string != NULL) | |
379 | free (saved_stabs[saved_stabs_index].string); | |
380 | saved_stabs[saved_stabs_index].type = type; | |
381 | saved_stabs[saved_stabs_index].desc = desc; | |
382 | saved_stabs[saved_stabs_index].value = value; | |
383 | saved_stabs[saved_stabs_index].string = xstrdup (string); | |
384 | saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT; | |
385 | } | |
386 | ||
387 | /* Provide context for an error. */ | |
388 | ||
389 | static void | |
2da42df6 | 390 | stab_context (void) |
252b5132 RH |
391 | { |
392 | int i; | |
393 | ||
394 | fprintf (stderr, _("Last stabs entries before error:\n")); | |
395 | fprintf (stderr, "n_type n_desc n_value string\n"); | |
396 | ||
397 | i = saved_stabs_index; | |
398 | do | |
399 | { | |
400 | struct saved_stab *stabp; | |
401 | ||
402 | stabp = saved_stabs + i; | |
403 | if (stabp->string != NULL) | |
404 | { | |
405 | const char *s; | |
406 | ||
407 | s = bfd_get_stab_name (stabp->type); | |
408 | if (s != NULL) | |
409 | fprintf (stderr, "%-6s", s); | |
410 | else if (stabp->type == 0) | |
411 | fprintf (stderr, "HdrSym"); | |
412 | else | |
413 | fprintf (stderr, "%-6d", stabp->type); | |
414 | fprintf (stderr, " %-6d ", stabp->desc); | |
415 | fprintf_vma (stderr, stabp->value); | |
416 | if (stabp->type != 0) | |
417 | fprintf (stderr, " %s", stabp->string); | |
418 | fprintf (stderr, "\n"); | |
419 | } | |
420 | i = (i + 1) % SAVE_STABS_COUNT; | |
421 | } | |
422 | while (i != saved_stabs_index); | |
423 | } | |
424 | ||
425 | /* Free the saved stab strings. */ | |
426 | ||
427 | static void | |
2da42df6 | 428 | free_saved_stabs (void) |
252b5132 RH |
429 | { |
430 | int i; | |
431 | ||
432 | for (i = 0; i < SAVE_STABS_COUNT; i++) | |
433 | { | |
434 | if (saved_stabs[i].string != NULL) | |
435 | { | |
436 | free (saved_stabs[i].string); | |
437 | saved_stabs[i].string = NULL; | |
438 | } | |
439 | } | |
440 | ||
441 | saved_stabs_index = 0; | |
442 | } |