Annotation of src/external/gpl3/binutils/dist/binutils/rddbg.c, Revision 1.1.1.5
1.1 skrll 1: /* rddbg.c -- Read debugging information into a generic form.
1.1.1.5 ! christos 2: Copyright (C) 1995-2018 Free Software Foundation, Inc.
1.1 skrll 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 3 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., 51 Franklin Street - Fifth Floor, Boston, MA
20: 02110-1301, USA. */
21:
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 "sysdep.h"
28: #include "bfd.h"
29: #include "libiberty.h"
30: #include "bucomm.h"
31: #include "debug.h"
32: #include "budbg.h"
33:
34: static bfd_boolean read_section_stabs_debugging_info
35: (bfd *, asymbol **, long, void *, bfd_boolean *);
36: static bfd_boolean read_symbol_stabs_debugging_info
37: (bfd *, asymbol **, long, void *, bfd_boolean *);
38: static bfd_boolean read_ieee_debugging_info (bfd *, void *, bfd_boolean *);
39: static void save_stab (int, int, bfd_vma, const char *);
40: static void stab_context (void);
41: static void free_saved_stabs (void);
42:
43: /* Read debugging information from a BFD. Returns a generic debugging
44: pointer. */
45:
46: void *
47: read_debugging_info (bfd *abfd, asymbol **syms, long symcount, bfd_boolean no_messages)
48: {
49: void *dhandle;
50: bfd_boolean found;
51:
52: dhandle = debug_init ();
53: if (dhandle == NULL)
54: return NULL;
55:
56: if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle,
57: &found))
58: return NULL;
59:
60: if (bfd_get_flavour (abfd) == bfd_target_aout_flavour)
61: {
62: if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle,
63: &found))
64: return NULL;
65: }
66:
67: if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour)
68: {
69: if (! read_ieee_debugging_info (abfd, dhandle, &found))
70: return NULL;
71: }
72:
73: /* Try reading the COFF symbols if we didn't find any stabs in COFF
74: sections. */
75: if (! found
76: && bfd_get_flavour (abfd) == bfd_target_coff_flavour
77: && symcount > 0)
78: {
79: if (! parse_coff (abfd, syms, symcount, dhandle))
80: return NULL;
81: found = TRUE;
82: }
83:
84: if (! found)
85: {
86: if (! no_messages)
87: non_fatal (_("%s: no recognized debugging information"),
88: bfd_get_filename (abfd));
89: return NULL;
90: }
91:
92: return dhandle;
93: }
94:
95: /* Read stabs in sections debugging information from a BFD. */
96:
97: static bfd_boolean
98: read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
99: void *dhandle, bfd_boolean *pfound)
100: {
101: static struct
102: {
103: const char *secname;
104: const char *strsecname;
105: }
106: names[] =
107: {
108: { ".stab", ".stabstr" },
109: { "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" },
110: { "$GDB_SYMBOLS$", "$GDB_STRINGS$" }
111: };
112: unsigned int i;
113: void *shandle;
114:
115: *pfound = FALSE;
116: shandle = NULL;
117:
118: for (i = 0; i < sizeof names / sizeof names[0]; i++)
119: {
120: asection *sec, *strsec;
121:
122: sec = bfd_get_section_by_name (abfd, names[i].secname);
123: strsec = bfd_get_section_by_name (abfd, names[i].strsecname);
124: if (sec != NULL && strsec != NULL)
125: {
126: bfd_size_type stabsize, strsize;
127: bfd_byte *stabs, *strings;
128: bfd_byte *stab;
129: bfd_size_type stroff, next_stroff;
130:
131: stabsize = bfd_section_size (abfd, sec);
132: stabs = (bfd_byte *) xmalloc (stabsize);
133: if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize))
134: {
135: fprintf (stderr, "%s: %s: %s\n",
136: bfd_get_filename (abfd), names[i].secname,
137: bfd_errmsg (bfd_get_error ()));
138: return FALSE;
139: }
140:
141: strsize = bfd_section_size (abfd, strsec);
1.1.1.3 christos 142: strings = (bfd_byte *) xmalloc (strsize + 1);
1.1 skrll 143: if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
144: {
145: fprintf (stderr, "%s: %s: %s\n",
146: bfd_get_filename (abfd), names[i].strsecname,
147: bfd_errmsg (bfd_get_error ()));
148: return FALSE;
149: }
1.1.1.3 christos 150: /* Zero terminate the strings table, just in case. */
151: strings [strsize] = 0;
1.1 skrll 152: if (shandle == NULL)
153: {
154: shandle = start_stab (dhandle, abfd, TRUE, syms, symcount);
155: if (shandle == NULL)
156: return FALSE;
157: }
158:
159: *pfound = TRUE;
160:
161: stroff = 0;
162: next_stroff = 0;
1.1.1.3 christos 163: /* PR 17512: file: 078-60391-0.001:0.1. */
164: for (stab = stabs; stab <= (stabs + stabsize) - 12; stab += 12)
1.1 skrll 165: {
166: unsigned int strx;
167: int type;
1.1.1.2 christos 168: int other ATTRIBUTE_UNUSED;
1.1 skrll 169: int desc;
170: bfd_vma value;
171:
172: /* This code presumes 32 bit values. */
173:
174: strx = bfd_get_32 (abfd, stab);
175: type = bfd_get_8 (abfd, stab + 4);
176: other = bfd_get_8 (abfd, stab + 5);
177: desc = bfd_get_16 (abfd, stab + 6);
178: value = bfd_get_32 (abfd, stab + 8);
179:
180: if (type == 0)
181: {
182: /* Special type 0 stabs indicate the offset to the
183: next string table. */
184: stroff = next_stroff;
185: next_stroff += value;
186: }
187: else
188: {
1.1.1.3 christos 189: size_t len;
1.1 skrll 190: char *f, *s;
191:
1.1.1.3 christos 192: if (stroff + strx >= strsize)
1.1 skrll 193: {
1.1.1.3 christos 194: fprintf (stderr, _("%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n"),
1.1 skrll 195: bfd_get_filename (abfd), names[i].secname,
196: (long) (stab - stabs) / 12, strx, type);
197: continue;
198: }
199:
200: s = (char *) strings + stroff + strx;
1.1.1.3 christos 201: f = NULL;
1.1 skrll 202:
1.1.1.3 christos 203: /* PR 17512: file: 002-87578-0.001:0.1.
204: It is possible to craft a file where, without the 'strlen (s) > 0',
205: an attempt to read the byte before 'strings' would occur. */
206: while ((len = strlen (s)) > 0
207: && s[len - 1] == '\\'
1.1 skrll 208: && stab + 12 < stabs + stabsize)
209: {
210: char *p;
211:
212: stab += 12;
1.1.1.3 christos 213: p = s + len - 1;
1.1 skrll 214: *p = '\0';
1.1.1.3 christos 215: strx = stroff + bfd_get_32 (abfd, stab);
216: if (strx >= strsize)
217: {
218: fprintf (stderr, _("%s: %s: stab entry %ld is corrupt\n"),
219: bfd_get_filename (abfd), names[i].secname,
220: (long) (stab - stabs) / 12);
221: break;
222: }
223: else
224: s = concat (s, (char *) strings + strx,
225: (const char *) NULL);
1.1 skrll 226:
227: /* We have to restore the backslash, because, if
228: the linker is hashing stabs strings, we may
229: see the same string more than once. */
230: *p = '\\';
231:
232: if (f != NULL)
233: free (f);
234: f = s;
235: }
236:
237: save_stab (type, desc, value, s);
238:
239: if (! parse_stab (dhandle, shandle, type, desc, value, s))
240: {
241: stab_context ();
242: free_saved_stabs ();
243: return FALSE;
244: }
245:
246: /* Don't free f, since I think the stabs code
247: expects strings to hang around. This should be
248: straightened out. FIXME. */
249: }
250: }
251:
252: free_saved_stabs ();
253: free (stabs);
254:
255: /* Don't free strings, since I think the stabs code expects
256: the strings to hang around. This should be straightened
257: out. FIXME. */
258: }
259: }
260:
261: if (shandle != NULL)
262: {
263: if (! finish_stab (dhandle, shandle))
264: return FALSE;
265: }
266:
267: return TRUE;
268: }
269:
270: /* Read stabs in the symbol table. */
271:
272: static bfd_boolean
273: read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
274: void *dhandle, bfd_boolean *pfound)
275: {
276: void *shandle;
277: asymbol **ps, **symend;
278:
279: shandle = NULL;
280: symend = syms + symcount;
281: for (ps = syms; ps < symend; ps++)
282: {
283: symbol_info i;
284:
285: bfd_get_symbol_info (abfd, *ps, &i);
286:
287: if (i.type == '-')
288: {
289: const char *s;
290: char *f;
291:
292: if (shandle == NULL)
293: {
294: shandle = start_stab (dhandle, abfd, FALSE, syms, symcount);
295: if (shandle == NULL)
296: return FALSE;
297: }
298:
299: *pfound = TRUE;
300:
301: s = i.name;
1.1.1.5 ! christos 302: if (s == NULL || strlen (s) < 1)
! 303: return FALSE;
1.1 skrll 304: f = NULL;
1.1.1.5 ! christos 305:
! 306: while (strlen (s) > 0
! 307: && s[strlen (s) - 1] == '\\'
1.1 skrll 308: && ps + 1 < symend)
309: {
310: char *sc, *n;
311:
312: ++ps;
313: sc = xstrdup (s);
314: sc[strlen (sc) - 1] = '\0';
315: n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL);
316: free (sc);
317: if (f != NULL)
318: free (f);
319: f = n;
320: s = n;
321: }
322:
323: save_stab (i.stab_type, i.stab_desc, i.value, s);
324:
325: if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc,
326: i.value, s))
327: {
328: stab_context ();
329: free_saved_stabs ();
330: return FALSE;
331: }
332:
333: /* Don't free f, since I think the stabs code expects
334: strings to hang around. This should be straightened out.
335: FIXME. */
336: }
337: }
338:
339: free_saved_stabs ();
340:
341: if (shandle != NULL)
342: {
343: if (! finish_stab (dhandle, shandle))
344: return FALSE;
345: }
346:
347: return TRUE;
348: }
349:
350: /* Read IEEE debugging information. */
351:
352: static bfd_boolean
353: read_ieee_debugging_info (bfd *abfd, void *dhandle, bfd_boolean *pfound)
354: {
355: asection *dsec;
356: bfd_size_type size;
357: bfd_byte *contents;
358:
359: /* The BFD backend puts the debugging information into a section
360: named .debug. */
361:
362: dsec = bfd_get_section_by_name (abfd, ".debug");
363: if (dsec == NULL)
364: return TRUE;
365:
366: size = bfd_section_size (abfd, dsec);
367: contents = (bfd_byte *) xmalloc (size);
368: if (! bfd_get_section_contents (abfd, dsec, contents, 0, size))
369: return FALSE;
370:
371: if (! parse_ieee (dhandle, abfd, contents, size))
372: return FALSE;
373:
374: free (contents);
375:
376: *pfound = TRUE;
377:
378: return TRUE;
379: }
380:
381: /* Record stabs strings, so that we can give some context for errors. */
382:
383: #define SAVE_STABS_COUNT (16)
384:
385: struct saved_stab
386: {
387: int type;
388: int desc;
389: bfd_vma value;
390: char *string;
391: };
392:
393: static struct saved_stab saved_stabs[SAVE_STABS_COUNT];
394: static int saved_stabs_index;
395:
396: /* Save a stabs string. */
397:
398: static void
399: save_stab (int type, int desc, bfd_vma value, const char *string)
400: {
401: if (saved_stabs[saved_stabs_index].string != NULL)
402: free (saved_stabs[saved_stabs_index].string);
403: saved_stabs[saved_stabs_index].type = type;
404: saved_stabs[saved_stabs_index].desc = desc;
405: saved_stabs[saved_stabs_index].value = value;
406: saved_stabs[saved_stabs_index].string = xstrdup (string);
407: saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT;
408: }
409:
410: /* Provide context for an error. */
411:
412: static void
413: stab_context (void)
414: {
415: int i;
416:
417: fprintf (stderr, _("Last stabs entries before error:\n"));
418: fprintf (stderr, "n_type n_desc n_value string\n");
419:
420: i = saved_stabs_index;
421: do
422: {
423: struct saved_stab *stabp;
424:
425: stabp = saved_stabs + i;
426: if (stabp->string != NULL)
427: {
428: const char *s;
429:
430: s = bfd_get_stab_name (stabp->type);
431: if (s != NULL)
432: fprintf (stderr, "%-6s", s);
433: else if (stabp->type == 0)
434: fprintf (stderr, "HdrSym");
435: else
436: fprintf (stderr, "%-6d", stabp->type);
437: fprintf (stderr, " %-6d ", stabp->desc);
438: fprintf_vma (stderr, stabp->value);
439: if (stabp->type != 0)
440: fprintf (stderr, " %s", stabp->string);
441: fprintf (stderr, "\n");
442: }
443: i = (i + 1) % SAVE_STABS_COUNT;
444: }
445: while (i != saved_stabs_index);
446: }
447:
448: /* Free the saved stab strings. */
449:
450: static void
451: free_saved_stabs (void)
452: {
453: int i;
454:
455: for (i = 0; i < SAVE_STABS_COUNT; i++)
456: {
457: if (saved_stabs[i].string != NULL)
458: {
459: free (saved_stabs[i].string);
460: saved_stabs[i].string = NULL;
461: }
462: }
463:
464: saved_stabs_index = 0;
465: }
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