464 lines
11 KiB
C
464 lines
11 KiB
C
/* rddbg.c -- Read debugging information into a generic form.
|
||
Copyright 1995, 1996, 1997, 2000, 2002 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
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
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. */
|
||
|
||
/* This file reads debugging information into a generic form. This
|
||
file knows how to dig the debugging information out of an object
|
||
file. */
|
||
|
||
#include "bfd.h"
|
||
#include "bucomm.h"
|
||
#include "libiberty.h"
|
||
#include "debug.h"
|
||
#include "budbg.h"
|
||
|
||
static bfd_boolean read_section_stabs_debugging_info
|
||
PARAMS ((bfd *, asymbol **, long, PTR, bfd_boolean *));
|
||
static bfd_boolean read_symbol_stabs_debugging_info
|
||
PARAMS ((bfd *, asymbol **, long, PTR, bfd_boolean *));
|
||
static bfd_boolean read_ieee_debugging_info
|
||
PARAMS ((bfd *, PTR, bfd_boolean *));
|
||
static void save_stab
|
||
PARAMS ((int, int, bfd_vma, const char *));
|
||
static void stab_context
|
||
PARAMS ((void));
|
||
static void free_saved_stabs
|
||
PARAMS ((void));
|
||
|
||
/* Read debugging information from a BFD. Returns a generic debugging
|
||
pointer. */
|
||
|
||
PTR
|
||
read_debugging_info (abfd, syms, symcount)
|
||
bfd *abfd;
|
||
asymbol **syms;
|
||
long symcount;
|
||
{
|
||
PTR dhandle;
|
||
bfd_boolean found;
|
||
|
||
dhandle = debug_init ();
|
||
if (dhandle == NULL)
|
||
return NULL;
|
||
|
||
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;
|
||
}
|
||
|
||
if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour)
|
||
{
|
||
if (! read_ieee_debugging_info (abfd, 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)
|
||
{
|
||
non_fatal (_("%s: no recognized debugging information"),
|
||
bfd_get_filename (abfd));
|
||
return NULL;
|
||
}
|
||
|
||
return dhandle;
|
||
}
|
||
|
||
/* Read stabs in sections debugging information from a BFD. */
|
||
|
||
static bfd_boolean
|
||
read_section_stabs_debugging_info (abfd, syms, symcount, dhandle, pfound)
|
||
bfd *abfd;
|
||
asymbol **syms;
|
||
long symcount;
|
||
PTR dhandle;
|
||
bfd_boolean *pfound;
|
||
{
|
||
static struct
|
||
{
|
||
const char *secname;
|
||
const char *strsecname;
|
||
} names[] = { { ".stab", ".stabstr" },
|
||
{ "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" } };
|
||
unsigned int i;
|
||
PTR shandle;
|
||
|
||
*pfound = FALSE;
|
||
shandle = NULL;
|
||
|
||
for (i = 0; i < sizeof names / sizeof names[0]; i++)
|
||
{
|
||
asection *sec, *strsec;
|
||
|
||
sec = bfd_get_section_by_name (abfd, names[i].secname);
|
||
strsec = bfd_get_section_by_name (abfd, names[i].strsecname);
|
||
if (sec != NULL && strsec != NULL)
|
||
{
|
||
bfd_size_type stabsize, strsize;
|
||
bfd_byte *stabs, *strings;
|
||
bfd_byte *stab;
|
||
bfd_size_type stroff, next_stroff;
|
||
|
||
stabsize = bfd_section_size (abfd, 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;
|
||
}
|
||
|
||
strsize = bfd_section_size (abfd, strsec);
|
||
strings = (bfd_byte *) xmalloc (strsize);
|
||
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;
|
||
}
|
||
|
||
if (shandle == NULL)
|
||
{
|
||
shandle = start_stab (dhandle, abfd, TRUE, syms, symcount);
|
||
if (shandle == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
*pfound = TRUE;
|
||
|
||
stroff = 0;
|
||
next_stroff = 0;
|
||
for (stab = stabs; stab < stabs + stabsize; stab += 12)
|
||
{
|
||
unsigned int strx;
|
||
int type;
|
||
int other;
|
||
int desc;
|
||
bfd_vma value;
|
||
|
||
/* This code presumes 32 bit values. */
|
||
|
||
strx = bfd_get_32 (abfd, stab);
|
||
type = bfd_get_8 (abfd, stab + 4);
|
||
other = bfd_get_8 (abfd, stab + 5);
|
||
desc = bfd_get_16 (abfd, stab + 6);
|
||
value = bfd_get_32 (abfd, stab + 8);
|
||
|
||
if (type == 0)
|
||
{
|
||
/* Special type 0 stabs indicate the offset to the
|
||
next string table. */
|
||
stroff = next_stroff;
|
||
next_stroff += value;
|
||
}
|
||
else
|
||
{
|
||
char *f, *s;
|
||
|
||
f = NULL;
|
||
|
||
if (stroff + strx > strsize)
|
||
{
|
||
fprintf (stderr, "%s: %s: stab entry %d is corrupt, strx = 0x%x, type = %d\n",
|
||
bfd_get_filename (abfd), names[i].secname,
|
||
(stab - stabs) / 12, strx, type);
|
||
continue;
|
||
}
|
||
|
||
s = (char *) strings + stroff + strx;
|
||
|
||
while (s[strlen (s) - 1] == '\\'
|
||
&& stab + 12 < stabs + stabsize)
|
||
{
|
||
char *p;
|
||
|
||
stab += 12;
|
||
p = s + strlen (s) - 1;
|
||
*p = '\0';
|
||
s = concat (s,
|
||
((char *) strings
|
||
+ stroff
|
||
+ bfd_get_32 (abfd, stab)),
|
||
(const char *) NULL);
|
||
|
||
/* We have to restore the backslash, because, if
|
||
the linker is hashing stabs strings, we may
|
||
see the same string more than once. */
|
||
*p = '\\';
|
||
|
||
if (f != NULL)
|
||
free (f);
|
||
f = s;
|
||
}
|
||
|
||
save_stab (type, desc, value, s);
|
||
|
||
if (! parse_stab (dhandle, shandle, type, desc, 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 ();
|
||
free (stabs);
|
||
|
||
/* Don't free strings, since I think the stabs code expects
|
||
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 (abfd, syms, symcount, dhandle, pfound)
|
||
bfd *abfd;
|
||
asymbol **syms;
|
||
long symcount;
|
||
PTR dhandle;
|
||
bfd_boolean *pfound;
|
||
{
|
||
PTR 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;
|
||
f = NULL;
|
||
while (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 TRUE;
|
||
}
|
||
|
||
/* Read IEEE debugging information. */
|
||
|
||
static bfd_boolean
|
||
read_ieee_debugging_info (abfd, dhandle, pfound)
|
||
bfd *abfd;
|
||
PTR dhandle;
|
||
bfd_boolean *pfound;
|
||
{
|
||
asection *dsec;
|
||
bfd_size_type size;
|
||
bfd_byte *contents;
|
||
|
||
/* The BFD backend puts the debugging information into a section
|
||
named .debug. */
|
||
|
||
dsec = bfd_get_section_by_name (abfd, ".debug");
|
||
if (dsec == NULL)
|
||
return TRUE;
|
||
|
||
size = bfd_section_size (abfd, dsec);
|
||
contents = (bfd_byte *) xmalloc (size);
|
||
if (! bfd_get_section_contents (abfd, dsec, contents, 0, size))
|
||
return FALSE;
|
||
|
||
if (! parse_ieee (dhandle, abfd, contents, size))
|
||
return FALSE;
|
||
|
||
free (contents);
|
||
|
||
*pfound = TRUE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* 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 (type, desc, value, string)
|
||
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 ()
|
||
{
|
||
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 ()
|
||
{
|
||
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;
|
||
}
|
||
}
|
||
|
||
saved_stabs_index = 0;
|
||
}
|