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/* rddbg.c -- Read debugging information into a generic form. |
Copyright 1995, 1996, 1997, 2000, 2002, 2003, 2005, 2007, 2008, |
2010 Free Software Foundation, Inc. |
Written by Ian Lance Taylor <ian@cygnus.com>. |
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This file is part of GNU Binutils. |
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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 3 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., 51 Franklin Street - Fifth Floor, Boston, MA |
02110-1301, USA. */ |
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/* This file reads debugging information into a generic form. This |
file knows how to dig the debugging information out of an object |
file. */ |
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#include "sysdep.h" |
#include "bfd.h" |
#include "libiberty.h" |
#include "bucomm.h" |
#include "debug.h" |
#include "budbg.h" |
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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 bfd_boolean read_ieee_debugging_info (bfd *, void *, bfd_boolean *); |
static void save_stab (int, int, bfd_vma, const char *); |
static void stab_context (void); |
static void free_saved_stabs (void); |
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/* Read debugging information from a BFD. Returns a generic debugging |
pointer. */ |
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void * |
read_debugging_info (bfd *abfd, asymbol **syms, long symcount, bfd_boolean no_messages) |
{ |
void *dhandle; |
bfd_boolean found; |
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dhandle = debug_init (); |
if (dhandle == NULL) |
return NULL; |
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if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle, |
&found)) |
return NULL; |
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if (bfd_get_flavour (abfd) == bfd_target_aout_flavour) |
{ |
if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle, |
&found)) |
return NULL; |
} |
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if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour) |
{ |
if (! read_ieee_debugging_info (abfd, dhandle, &found)) |
return NULL; |
} |
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/* 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; |
} |
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if (! found) |
{ |
if (! no_messages) |
non_fatal (_("%s: no recognized debugging information"), |
bfd_get_filename (abfd)); |
return NULL; |
} |
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return dhandle; |
} |
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/* Read stabs in sections debugging information from a BFD. */ |
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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" }, |
{ "LC_SYMTAB.stabs", "LC_SYMTAB.stabstr" }, |
{ "$GDB_SYMBOLS$", "$GDB_STRINGS$" } |
}; |
unsigned int i; |
void *shandle; |
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*pfound = FALSE; |
shandle = NULL; |
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for (i = 0; i < sizeof names / sizeof names[0]; i++) |
{ |
asection *sec, *strsec; |
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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; |
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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; |
} |
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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; |
} |
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if (shandle == NULL) |
{ |
shandle = start_stab (dhandle, abfd, TRUE, syms, symcount); |
if (shandle == NULL) |
return FALSE; |
} |
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*pfound = TRUE; |
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stroff = 0; |
next_stroff = 0; |
for (stab = stabs; stab < stabs + stabsize; stab += 12) |
{ |
unsigned int strx; |
int type; |
int other ATTRIBUTE_UNUSED; |
int desc; |
bfd_vma value; |
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/* This code presumes 32 bit values. */ |
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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); |
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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; |
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f = NULL; |
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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; |
} |
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s = (char *) strings + stroff + strx; |
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while (s[strlen (s) - 1] == '\\' |
&& stab + 12 < stabs + stabsize) |
{ |
char *p; |
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stab += 12; |
p = s + strlen (s) - 1; |
*p = '\0'; |
s = concat (s, |
((char *) strings |
+ stroff |
+ bfd_get_32 (abfd, stab)), |
(const char *) NULL); |
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/* We have to restore the backslash, because, if |
the linker is hashing stabs strings, we may |
see the same string more than once. */ |
*p = '\\'; |
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if (f != NULL) |
free (f); |
f = s; |
} |
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save_stab (type, desc, value, s); |
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if (! parse_stab (dhandle, shandle, type, desc, value, s)) |
{ |
stab_context (); |
free_saved_stabs (); |
return FALSE; |
} |
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/* Don't free f, since I think the stabs code |
expects strings to hang around. This should be |
straightened out. FIXME. */ |
} |
} |
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free_saved_stabs (); |
free (stabs); |
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/* Don't free strings, since I think the stabs code expects |
the strings to hang around. This should be straightened |
out. FIXME. */ |
} |
} |
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if (shandle != NULL) |
{ |
if (! finish_stab (dhandle, shandle)) |
return FALSE; |
} |
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return TRUE; |
} |
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/* Read stabs in the symbol table. */ |
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static bfd_boolean |
read_symbol_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount, |
void *dhandle, bfd_boolean *pfound) |
{ |
void *shandle; |
asymbol **ps, **symend; |
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shandle = NULL; |
symend = syms + symcount; |
for (ps = syms; ps < symend; ps++) |
{ |
symbol_info i; |
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bfd_get_symbol_info (abfd, *ps, &i); |
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if (i.type == '-') |
{ |
const char *s; |
char *f; |
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if (shandle == NULL) |
{ |
shandle = start_stab (dhandle, abfd, FALSE, syms, symcount); |
if (shandle == NULL) |
return FALSE; |
} |
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*pfound = TRUE; |
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s = i.name; |
f = NULL; |
while (s[strlen (s) - 1] == '\\' |
&& ps + 1 < symend) |
{ |
char *sc, *n; |
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++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; |
} |
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save_stab (i.stab_type, i.stab_desc, i.value, s); |
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if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc, |
i.value, s)) |
{ |
stab_context (); |
free_saved_stabs (); |
return FALSE; |
} |
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/* Don't free f, since I think the stabs code expects |
strings to hang around. This should be straightened out. |
FIXME. */ |
} |
} |
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free_saved_stabs (); |
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if (shandle != NULL) |
{ |
if (! finish_stab (dhandle, shandle)) |
return FALSE; |
} |
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return TRUE; |
} |
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/* Read IEEE debugging information. */ |
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static bfd_boolean |
read_ieee_debugging_info (bfd *abfd, void *dhandle, bfd_boolean *pfound) |
{ |
asection *dsec; |
bfd_size_type size; |
bfd_byte *contents; |
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/* The BFD backend puts the debugging information into a section |
named .debug. */ |
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dsec = bfd_get_section_by_name (abfd, ".debug"); |
if (dsec == NULL) |
return TRUE; |
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size = bfd_section_size (abfd, dsec); |
contents = (bfd_byte *) xmalloc (size); |
if (! bfd_get_section_contents (abfd, dsec, contents, 0, size)) |
return FALSE; |
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if (! parse_ieee (dhandle, abfd, contents, size)) |
return FALSE; |
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free (contents); |
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*pfound = TRUE; |
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return TRUE; |
} |
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/* Record stabs strings, so that we can give some context for errors. */ |
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#define SAVE_STABS_COUNT (16) |
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struct saved_stab |
{ |
int type; |
int desc; |
bfd_vma value; |
char *string; |
}; |
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static struct saved_stab saved_stabs[SAVE_STABS_COUNT]; |
static int saved_stabs_index; |
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/* Save a stabs string. */ |
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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; |
} |
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/* Provide context for an error. */ |
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static void |
stab_context (void) |
{ |
int i; |
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fprintf (stderr, _("Last stabs entries before error:\n")); |
fprintf (stderr, "n_type n_desc n_value string\n"); |
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i = saved_stabs_index; |
do |
{ |
struct saved_stab *stabp; |
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stabp = saved_stabs + i; |
if (stabp->string != NULL) |
{ |
const char *s; |
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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); |
} |
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/* Free the saved stab strings. */ |
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static void |
free_saved_stabs (void) |
{ |
int i; |
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for (i = 0; i < SAVE_STABS_COUNT; i++) |
{ |
if (saved_stabs[i].string != NULL) |
{ |
free (saved_stabs[i].string); |
saved_stabs[i].string = NULL; |
} |
} |
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saved_stabs_index = 0; |
} |