133 lines
4.0 KiB
C
133 lines
4.0 KiB
C
/* Find the debuginfo file for a module from its build ID.
|
|
Copyright (C) 2007, 2009, 2014 Red Hat, Inc.
|
|
This file is part of elfutils.
|
|
|
|
This file is free software; you can redistribute it and/or modify
|
|
it under the terms of either
|
|
|
|
* the GNU Lesser General Public License as published by the Free
|
|
Software Foundation; either version 3 of the License, or (at
|
|
your option) any later version
|
|
|
|
or
|
|
|
|
* 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
|
|
|
|
or both in parallel, as here.
|
|
|
|
elfutils 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 copies of the GNU General Public License and
|
|
the GNU Lesser General Public License along with this program. If
|
|
not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include "libdwflP.h"
|
|
#include <unistd.h>
|
|
|
|
|
|
int
|
|
dwfl_build_id_find_debuginfo (Dwfl_Module *mod,
|
|
void **userdata __attribute__ ((unused)),
|
|
const char *modname __attribute__ ((unused)),
|
|
Dwarf_Addr base __attribute__ ((unused)),
|
|
const char *file __attribute__ ((unused)),
|
|
const char *debuglink __attribute__ ((unused)),
|
|
GElf_Word crc __attribute__ ((unused)),
|
|
char **debuginfo_file_name)
|
|
{
|
|
int fd = -1;
|
|
|
|
/* Are we looking for a separate debug file for the main file or for
|
|
an alternate (dwz multi) debug file? Alternatively we could check
|
|
whether the dwbias == -1. */
|
|
if (mod->dw != NULL)
|
|
{
|
|
const void *build_id;
|
|
const char *altname;
|
|
ssize_t build_id_len = INTUSE(dwelf_dwarf_gnu_debugaltlink) (mod->dw,
|
|
&altname,
|
|
&build_id);
|
|
if (build_id_len > 0)
|
|
fd = __libdwfl_open_by_build_id (mod, true, debuginfo_file_name,
|
|
build_id_len, build_id);
|
|
|
|
if (fd >= 0)
|
|
{
|
|
/* We need to open an Elf handle on the file so we can check its
|
|
build ID note for validation. Backdoor the handle into the
|
|
module data structure since we had to open it early anyway. */
|
|
Dwfl_Error error = __libdw_open_file (&fd, &mod->alt_elf,
|
|
true, false);
|
|
if (error != DWFL_E_NOERROR)
|
|
__libdwfl_seterrno (error);
|
|
else
|
|
{
|
|
const void *alt_build_id;
|
|
ssize_t alt_len = INTUSE(dwelf_elf_gnu_build_id) (mod->alt_elf,
|
|
&alt_build_id);
|
|
if (alt_len > 0 && alt_len == build_id_len
|
|
&& memcmp (build_id, alt_build_id, alt_len) == 0)
|
|
return fd;
|
|
else
|
|
{
|
|
/* A mismatch! */
|
|
elf_end (mod->alt_elf);
|
|
mod->alt_elf = NULL;
|
|
close (fd);
|
|
fd = -1;
|
|
}
|
|
free (*debuginfo_file_name);
|
|
*debuginfo_file_name = NULL;
|
|
errno = 0;
|
|
}
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
/* We don't even have the Dwarf yet and it isn't in the main file.
|
|
Try to find separate debug file now using the module build id. */
|
|
const unsigned char *bits;
|
|
GElf_Addr vaddr;
|
|
|
|
if (INTUSE(dwfl_module_build_id) (mod, &bits, &vaddr) > 0)
|
|
fd = __libdwfl_open_mod_by_build_id (mod, true, debuginfo_file_name);
|
|
if (fd >= 0)
|
|
{
|
|
/* We need to open an Elf handle on the file so we can check its
|
|
build ID note for validation. Backdoor the handle into the
|
|
module data structure since we had to open it early anyway. */
|
|
Dwfl_Error error = __libdw_open_file (&fd, &mod->debug.elf, true, false);
|
|
if (error != DWFL_E_NOERROR)
|
|
__libdwfl_seterrno (error);
|
|
else if (likely (__libdwfl_find_build_id (mod, false,
|
|
mod->debug.elf) == 2))
|
|
{
|
|
/* Also backdoor the gratuitous flag. */
|
|
mod->debug.valid = true;
|
|
return fd;
|
|
}
|
|
else
|
|
{
|
|
/* A mismatch! */
|
|
elf_end (mod->debug.elf);
|
|
mod->debug.elf = NULL;
|
|
close (fd);
|
|
fd = -1;
|
|
}
|
|
free (*debuginfo_file_name);
|
|
*debuginfo_file_name = NULL;
|
|
errno = 0;
|
|
}
|
|
return fd;
|
|
}
|
|
INTDEF (dwfl_build_id_find_debuginfo)
|