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/* Find the debuginfo file for a module from its build ID.
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Copyright (C) 2007, 2009, 2014 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libdwflP.h"
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#include <unistd.h>
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int
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dwfl_build_id_find_debuginfo (Dwfl_Module *mod,
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void **userdata __attribute__ ((unused)),
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const char *modname __attribute__ ((unused)),
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Dwarf_Addr base __attribute__ ((unused)),
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const char *file __attribute__ ((unused)),
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const char *debuglink __attribute__ ((unused)),
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GElf_Word crc __attribute__ ((unused)),
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char **debuginfo_file_name)
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{
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int fd = -1;
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/* Are we looking for a separate debug file for the main file or for
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an alternate (dwz multi) debug file? Alternatively we could check
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whether the dwbias == -1. */
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if (mod->dw != NULL)
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{
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const void *build_id;
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const char *altname;
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ssize_t build_id_len = INTUSE(dwelf_dwarf_gnu_debugaltlink) (mod->dw,
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&altname,
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&build_id);
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if (build_id_len > 0)
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fd = __libdwfl_open_by_build_id (mod, true, debuginfo_file_name,
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build_id_len, build_id);
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if (fd >= 0)
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{
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/* We need to open an Elf handle on the file so we can check its
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build ID note for validation. Backdoor the handle into the
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module data structure since we had to open it early anyway. */
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Dwfl_Error error = __libdw_open_file (&fd, &mod->alt_elf,
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true, false);
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if (error != DWFL_E_NOERROR)
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__libdwfl_seterrno (error);
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else
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{
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const void *alt_build_id;
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ssize_t alt_len = INTUSE(dwelf_elf_gnu_build_id) (mod->alt_elf,
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&alt_build_id);
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if (alt_len > 0 && alt_len == build_id_len
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&& memcmp (build_id, alt_build_id, alt_len) == 0)
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return fd;
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else
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{
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/* A mismatch! */
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elf_end (mod->alt_elf);
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mod->alt_elf = NULL;
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close (fd);
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fd = -1;
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}
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free (*debuginfo_file_name);
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*debuginfo_file_name = NULL;
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errno = 0;
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}
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}
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return fd;
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}
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/* We don't even have the Dwarf yet and it isn't in the main file.
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Try to find separate debug file now using the module build id. */
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const unsigned char *bits;
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GElf_Addr vaddr;
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if (INTUSE(dwfl_module_build_id) (mod, &bits, &vaddr) > 0)
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fd = __libdwfl_open_mod_by_build_id (mod, true, debuginfo_file_name);
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if (fd >= 0)
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{
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/* We need to open an Elf handle on the file so we can check its
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build ID note for validation. Backdoor the handle into the
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module data structure since we had to open it early anyway. */
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Dwfl_Error error = __libdw_open_file (&fd, &mod->debug.elf, true, false);
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if (error != DWFL_E_NOERROR)
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__libdwfl_seterrno (error);
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else if (likely (__libdwfl_find_build_id (mod, false,
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mod->debug.elf) == 2))
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{
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/* Also backdoor the gratuitous flag. */
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mod->debug.valid = true;
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return fd;
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}
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else
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{
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/* A mismatch! */
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elf_end (mod->debug.elf);
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mod->debug.elf = NULL;
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close (fd);
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fd = -1;
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}
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free (*debuginfo_file_name);
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*debuginfo_file_name = NULL;
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errno = 0;
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}
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return fd;
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}
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INTDEF (dwfl_build_id_find_debuginfo)
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