1 /* rddbg.c -- Read debugging information into a generic form.
2 Copyright (C) 1995-2018 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor <ian@cygnus.com>.
5 This file is part of GNU Binutils.
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.
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.
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
23 /* This file reads debugging information into a generic form. This
24 file knows how to dig the debugging information out of an object
29 #include "libiberty.h"
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 void save_stab (int, int, bfd_vma, const char *);
39 static void stab_context (void);
40 static void free_saved_stabs (void);
42 /* Read debugging information from a BFD. Returns a generic debugging
46 read_debugging_info (bfd *abfd, asymbol **syms, long symcount, bfd_boolean no_messages)
51 dhandle = debug_init ();
55 if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle,
59 if (bfd_get_flavour (abfd) == bfd_target_aout_flavour)
61 if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle,
66 /* Try reading the COFF symbols if we didn't find any stabs in COFF
69 && bfd_get_flavour (abfd) == bfd_target_coff_flavour
72 if (! parse_coff (abfd, syms, symcount, dhandle))
80 non_fatal (_("%s: no recognized debugging information"),
81 bfd_get_filename (abfd));
88 /* Read stabs in sections debugging information from a BFD. */
91 read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
92 void *dhandle, bfd_boolean *pfound)
97 const char *strsecname;
101 { ".stab", ".stabstr" },
102 { "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" },
103 { "$GDB_SYMBOLS$", "$GDB_STRINGS$" }
111 for (i = 0; i < sizeof names / sizeof names[0]; i++)
113 asection *sec, *strsec;
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)
119 bfd_size_type stabsize, strsize;
120 bfd_byte *stabs, *strings;
122 bfd_size_type stroff, next_stroff;
124 stabsize = bfd_section_size (abfd, sec);
125 stabs = (bfd_byte *) xmalloc (stabsize);
126 if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize))
128 fprintf (stderr, "%s: %s: %s\n",
129 bfd_get_filename (abfd), names[i].secname,
130 bfd_errmsg (bfd_get_error ()));
134 strsize = bfd_section_size (abfd, strsec);
135 strings = (bfd_byte *) xmalloc (strsize + 1);
136 if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
138 fprintf (stderr, "%s: %s: %s\n",
139 bfd_get_filename (abfd), names[i].strsecname,
140 bfd_errmsg (bfd_get_error ()));
143 /* Zero terminate the strings table, just in case. */
144 strings [strsize] = 0;
147 shandle = start_stab (dhandle, abfd, TRUE, syms, symcount);
156 /* PR 17512: file: 078-60391-0.001:0.1. */
157 for (stab = stabs; stab <= (stabs + stabsize) - 12; stab += 12)
161 int other ATTRIBUTE_UNUSED;
165 /* This code presumes 32 bit values. */
167 strx = bfd_get_32 (abfd, stab);
168 type = bfd_get_8 (abfd, stab + 4);
169 other = bfd_get_8 (abfd, stab + 5);
170 desc = bfd_get_16 (abfd, stab + 6);
171 value = bfd_get_32 (abfd, stab + 8);
175 /* Special type 0 stabs indicate the offset to the
176 next string table. */
177 stroff = next_stroff;
178 next_stroff += value;
185 if (stroff + strx >= strsize)
187 fprintf (stderr, _("%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n"),
188 bfd_get_filename (abfd), names[i].secname,
189 (long) (stab - stabs) / 12, strx, type);
193 s = (char *) strings + stroff + strx;
196 /* PR 17512: file: 002-87578-0.001:0.1.
197 It is possible to craft a file where, without the 'strlen (s) > 0',
198 an attempt to read the byte before 'strings' would occur. */
199 while ((len = strlen (s)) > 0
200 && s[len - 1] == '\\'
201 && stab + 12 < stabs + stabsize)
208 strx = stroff + bfd_get_32 (abfd, stab);
211 fprintf (stderr, _("%s: %s: stab entry %ld is corrupt\n"),
212 bfd_get_filename (abfd), names[i].secname,
213 (long) (stab - stabs) / 12);
217 s = concat (s, (char *) strings + strx,
218 (const char *) NULL);
220 /* We have to restore the backslash, because, if
221 the linker is hashing stabs strings, we may
222 see the same string more than once. */
230 save_stab (type, desc, value, s);
232 if (! parse_stab (dhandle, shandle, type, desc, value, s))
239 /* Don't free f, since I think the stabs code
240 expects strings to hang around. This should be
241 straightened out. FIXME. */
248 /* Don't free strings, since I think the stabs code expects
249 the strings to hang around. This should be straightened
256 if (! finish_stab (dhandle, shandle))
263 /* Read stabs in the symbol table. */
266 read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
267 void *dhandle, bfd_boolean *pfound)
270 asymbol **ps, **symend;
273 symend = syms + symcount;
274 for (ps = syms; ps < symend; ps++)
278 bfd_get_symbol_info (abfd, *ps, &i);
287 shandle = start_stab (dhandle, abfd, FALSE, syms, symcount);
295 if (s == NULL || strlen (s) < 1)
299 while (strlen (s) > 0
300 && s[strlen (s) - 1] == '\\'
307 sc[strlen (sc) - 1] = '\0';
308 n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL);
316 save_stab (i.stab_type, i.stab_desc, i.value, s);
318 if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc,
326 /* Don't free f, since I think the stabs code expects
327 strings to hang around. This should be straightened out.
336 if (! finish_stab (dhandle, shandle))
343 /* Record stabs strings, so that we can give some context for errors. */
345 #define SAVE_STABS_COUNT (16)
355 static struct saved_stab saved_stabs[SAVE_STABS_COUNT];
356 static int saved_stabs_index;
358 /* Save a stabs string. */
361 save_stab (int type, int desc, bfd_vma value, const char *string)
363 if (saved_stabs[saved_stabs_index].string != NULL)
364 free (saved_stabs[saved_stabs_index].string);
365 saved_stabs[saved_stabs_index].type = type;
366 saved_stabs[saved_stabs_index].desc = desc;
367 saved_stabs[saved_stabs_index].value = value;
368 saved_stabs[saved_stabs_index].string = xstrdup (string);
369 saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT;
372 /* Provide context for an error. */
379 fprintf (stderr, _("Last stabs entries before error:\n"));
380 fprintf (stderr, "n_type n_desc n_value string\n");
382 i = saved_stabs_index;
385 struct saved_stab *stabp;
387 stabp = saved_stabs + i;
388 if (stabp->string != NULL)
392 s = bfd_get_stab_name (stabp->type);
394 fprintf (stderr, "%-6s", s);
395 else if (stabp->type == 0)
396 fprintf (stderr, "HdrSym");
398 fprintf (stderr, "%-6d", stabp->type);
399 fprintf (stderr, " %-6d ", stabp->desc);
400 fprintf_vma (stderr, stabp->value);
401 if (stabp->type != 0)
402 fprintf (stderr, " %s", stabp->string);
403 fprintf (stderr, "\n");
405 i = (i + 1) % SAVE_STABS_COUNT;
407 while (i != saved_stabs_index);
410 /* Free the saved stab strings. */
413 free_saved_stabs (void)
417 for (i = 0; i < SAVE_STABS_COUNT; i++)
419 if (saved_stabs[i].string != NULL)
421 free (saved_stabs[i].string);
422 saved_stabs[i].string = NULL;
426 saved_stabs_index = 0;