/* rddbg.c -- Read debugging information into a generic form.
- Copyright (C) 1995 Free Software Foundation, Inc.
+ Copyright (C) 1995-2019 Free Software Foundation, Inc.
Written by Ian Lance Taylor <ian@cygnus.com>.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
+
/* This file reads debugging information into a generic form. This
file knows how to dig the debugging information out of an object
file. */
+#include "sysdep.h"
#include "bfd.h"
-#include "bucomm.h"
#include "libiberty.h"
+#include "bucomm.h"
#include "debug.h"
#include "budbg.h"
-static boolean read_section_stabs_debugging_info
- PARAMS ((bfd *, PTR, boolean *));
+static bfd_boolean read_section_stabs_debugging_info
+ (bfd *, asymbol **, long, void *, bfd_boolean *);
+static bfd_boolean read_symbol_stabs_debugging_info
+ (bfd *, asymbol **, long, void *, bfd_boolean *);
+static void save_stab (int, int, bfd_vma, const char *);
+static void stab_context (void);
+static void free_saved_stabs (void);
/* Read debugging information from a BFD. Returns a generic debugging
pointer. */
-PTR
-read_debugging_info (abfd)
- bfd *abfd;
+void *
+read_debugging_info (bfd *abfd, asymbol **syms, long symcount, bfd_boolean no_messages)
{
- PTR dhandle;
- boolean found;
+ void *dhandle;
+ bfd_boolean found;
dhandle = debug_init ();
if (dhandle == NULL)
return NULL;
- /* All we know about right now is stabs in sections. */
-
- if (! read_section_stabs_debugging_info (abfd, dhandle, &found))
+ if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle,
+ &found))
return NULL;
+ if (bfd_get_flavour (abfd) == bfd_target_aout_flavour)
+ {
+ if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle,
+ &found))
+ return NULL;
+ }
+
+ /* Try reading the COFF symbols if we didn't find any stabs in COFF
+ sections. */
+ if (! found
+ && bfd_get_flavour (abfd) == bfd_target_coff_flavour
+ && symcount > 0)
+ {
+ if (! parse_coff (abfd, syms, symcount, dhandle))
+ return NULL;
+ found = TRUE;
+ }
+
if (! found)
{
- fprintf (stderr, "%s: no recognized debugging information\n",
- bfd_get_filename (abfd));
+ if (! no_messages)
+ non_fatal (_("%s: no recognized debugging information"),
+ bfd_get_filename (abfd));
return NULL;
}
/* Read stabs in sections debugging information from a BFD. */
-static boolean
-read_section_stabs_debugging_info (abfd, dhandle, pfound)
- bfd *abfd;
- PTR dhandle;
- boolean *pfound;
+static bfd_boolean
+read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
+ void *dhandle, bfd_boolean *pfound)
{
static struct
{
const char *secname;
const char *strsecname;
- } names[] = { { ".stab", ".stabstr" } };
+ }
+ names[] =
+ {
+ { ".stab", ".stabstr" },
+ { "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" },
+ { "$GDB_SYMBOLS$", "$GDB_STRINGS$" }
+ };
unsigned int i;
- PTR shandle;
+ void *shandle;
- *pfound = false;
+ *pfound = FALSE;
shandle = NULL;
for (i = 0; i < sizeof names / sizeof names[0]; i++)
bfd_byte *stab;
bfd_size_type stroff, next_stroff;
- stabsize = bfd_section_size (abfd, sec);
+ stabsize = bfd_section_size (sec);
stabs = (bfd_byte *) xmalloc (stabsize);
if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize))
{
fprintf (stderr, "%s: %s: %s\n",
bfd_get_filename (abfd), names[i].secname,
bfd_errmsg (bfd_get_error ()));
- return false;
+ free (shandle);
+ free (stabs);
+ return FALSE;
}
- strsize = bfd_section_size (abfd, strsec);
- strings = (bfd_byte *) xmalloc (strsize);
+ strsize = bfd_section_size (strsec);
+ strings = (bfd_byte *) xmalloc (strsize + 1);
if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
{
fprintf (stderr, "%s: %s: %s\n",
bfd_get_filename (abfd), names[i].strsecname,
bfd_errmsg (bfd_get_error ()));
- return false;
+ free (shandle);
+ free (strings);
+ free (stabs);
+ return FALSE;
}
-
+ /* Zero terminate the strings table, just in case. */
+ strings [strsize] = 0;
if (shandle == NULL)
{
- shandle = start_stab (dhandle);
+ shandle = start_stab (dhandle, abfd, TRUE, syms, symcount);
if (shandle == NULL)
- return false;
+ {
+ free (strings);
+ free (stabs);
+ return FALSE;
+ }
}
- *pfound = true;
+ *pfound = TRUE;
stroff = 0;
next_stroff = 0;
- for (stab = stabs; stab < stabs + stabsize; stab += 12)
+ /* PR 17512: file: 078-60391-0.001:0.1. */
+ for (stab = stabs; stab <= (stabs + stabsize) - 12; stab += 12)
{
- bfd_size_type strx;
+ unsigned int strx;
int type;
- int other;
+ int other ATTRIBUTE_UNUSED;
int desc;
bfd_vma value;
if (type == 0)
{
/* Special type 0 stabs indicate the offset to the
- next string table. */
+ next string table. */
stroff = next_stroff;
next_stroff += value;
}
else
{
+ size_t len;
char *f, *s;
- f = NULL;
+ if (stroff + strx >= strsize)
+ {
+ fprintf (stderr, _("%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n"),
+ bfd_get_filename (abfd), names[i].secname,
+ (long) (stab - stabs) / 12, strx, type);
+ continue;
+ }
+
s = (char *) strings + stroff + strx;
- while (s[strlen (s) - 1] == '\\'
+ f = NULL;
+
+ /* PR 17512: file: 002-87578-0.001:0.1.
+ It is possible to craft a file where, without the 'strlen (s) > 0',
+ an attempt to read the byte before 'strings' would occur. */
+ while ((len = strlen (s)) > 0
+ && s[len - 1] == '\\'
&& stab + 12 < stabs + stabsize)
{
+ char *p;
+
stab += 12;
- s[strlen (s) - 1] = '\0';
- s = concat (s,
- ((char *) strings
- + stroff
- + bfd_get_32 (abfd, stab)),
+ p = s + len - 1;
+ *p = '\0';
+ strx = stroff + bfd_get_32 (abfd, stab);
+ if (strx >= strsize)
+ {
+ fprintf (stderr, _("%s: %s: stab entry %ld is corrupt\n"),
+ bfd_get_filename (abfd), names[i].secname,
+ (long) (stab - stabs) / 12);
+ break;
+ }
+
+ s = concat (s, (char *) strings + strx,
(const char *) NULL);
- if (f != NULL)
- free (f);
+
+ /* We have to restore the backslash, because, if
+ the linker is hashing stabs strings, we may
+ see the same string more than once. */
+ *p = '\\';
+
+ free (f);
f = s;
}
+ save_stab (type, desc, value, s);
+
if (! parse_stab (dhandle, shandle, type, desc, value, s))
- return false;
+ {
+ stab_context ();
+ free_saved_stabs ();
+ free (f);
+ free (shandle);
+ free (stabs);
+ free (strings);
+ return FALSE;
+ }
/* Don't free f, since I think the stabs code
- expects strings to hang around. This should be
- straightened out. FIXME. */
+ expects strings to hang around. This should be
+ straightened out. FIXME. */
}
}
+ free_saved_stabs ();
free (stabs);
/* Don't free strings, since I think the stabs code expects
- the strings to hang around. This should be straightened
- out. FIXME. */
+ the strings to hang around. This should be straightened
+ out. FIXME. */
+ }
+ }
+
+ if (shandle != NULL)
+ {
+ if (! finish_stab (dhandle, shandle))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/* Read stabs in the symbol table. */
+
+static bfd_boolean
+read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
+ void *dhandle, bfd_boolean *pfound)
+{
+ void *shandle;
+ asymbol **ps, **symend;
+
+ shandle = NULL;
+ symend = syms + symcount;
+ for (ps = syms; ps < symend; ps++)
+ {
+ symbol_info i;
+
+ bfd_get_symbol_info (abfd, *ps, &i);
+
+ if (i.type == '-')
+ {
+ const char *s;
+ char *f;
+
+ if (shandle == NULL)
+ {
+ shandle = start_stab (dhandle, abfd, FALSE, syms, symcount);
+ if (shandle == NULL)
+ return FALSE;
+ }
+
+ *pfound = TRUE;
+
+ s = i.name;
+ if (s == NULL || strlen (s) < 1)
+ return FALSE;
+ f = NULL;
+
+ while (strlen (s) > 0
+ && s[strlen (s) - 1] == '\\'
+ && ps + 1 < symend)
+ {
+ char *sc, *n;
+
+ ++ps;
+ sc = xstrdup (s);
+ sc[strlen (sc) - 1] = '\0';
+ n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL);
+ free (sc);
+ if (f != NULL)
+ free (f);
+ f = n;
+ s = n;
+ }
+
+ save_stab (i.stab_type, i.stab_desc, i.value, s);
+
+ if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc,
+ i.value, s))
+ {
+ stab_context ();
+ free_saved_stabs ();
+ return FALSE;
+ }
+
+ /* Don't free f, since I think the stabs code expects
+ strings to hang around. This should be straightened out.
+ FIXME. */
}
}
+ free_saved_stabs ();
+
if (shandle != NULL)
{
if (! finish_stab (dhandle, shandle))
- return false;
+ return FALSE;
+ }
+
+ return TRUE;
+}
+\f
+/* Record stabs strings, so that we can give some context for errors. */
+
+#define SAVE_STABS_COUNT (16)
+
+struct saved_stab
+{
+ int type;
+ int desc;
+ bfd_vma value;
+ char *string;
+};
+
+static struct saved_stab saved_stabs[SAVE_STABS_COUNT];
+static int saved_stabs_index;
+
+/* Save a stabs string. */
+
+static void
+save_stab (int type, int desc, bfd_vma value, const char *string)
+{
+ if (saved_stabs[saved_stabs_index].string != NULL)
+ free (saved_stabs[saved_stabs_index].string);
+ saved_stabs[saved_stabs_index].type = type;
+ saved_stabs[saved_stabs_index].desc = desc;
+ saved_stabs[saved_stabs_index].value = value;
+ saved_stabs[saved_stabs_index].string = xstrdup (string);
+ saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT;
+}
+
+/* Provide context for an error. */
+
+static void
+stab_context (void)
+{
+ int i;
+
+ fprintf (stderr, _("Last stabs entries before error:\n"));
+ fprintf (stderr, "n_type n_desc n_value string\n");
+
+ i = saved_stabs_index;
+ do
+ {
+ struct saved_stab *stabp;
+
+ stabp = saved_stabs + i;
+ if (stabp->string != NULL)
+ {
+ const char *s;
+
+ s = bfd_get_stab_name (stabp->type);
+ if (s != NULL)
+ fprintf (stderr, "%-6s", s);
+ else if (stabp->type == 0)
+ fprintf (stderr, "HdrSym");
+ else
+ fprintf (stderr, "%-6d", stabp->type);
+ fprintf (stderr, " %-6d ", stabp->desc);
+ fprintf_vma (stderr, stabp->value);
+ if (stabp->type != 0)
+ fprintf (stderr, " %s", stabp->string);
+ fprintf (stderr, "\n");
+ }
+ i = (i + 1) % SAVE_STABS_COUNT;
+ }
+ while (i != saved_stabs_index);
+}
+
+/* Free the saved stab strings. */
+
+static void
+free_saved_stabs (void)
+{
+ int i;
+
+ for (i = 0; i < SAVE_STABS_COUNT; i++)
+ {
+ if (saved_stabs[i].string != NULL)
+ {
+ free (saved_stabs[i].string);
+ saved_stabs[i].string = NULL;
+ }
}
- return true;
+ saved_stabs_index = 0;
}
projects / deliverable / binutils-gdb.git / blobdiff