230 lines
6.1 KiB
C
230 lines
6.1 KiB
C
/* build-id-related functions.
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Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "bfd.h"
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#include "gdb_bfd.h"
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#include "build-id.h"
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#include "gdbsupport/gdb_vecs.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "filenames.h"
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#include "gdbcore.h"
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/* See build-id.h. */
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const struct bfd_build_id *
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build_id_bfd_get (bfd *abfd)
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{
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if (!bfd_check_format (abfd, bfd_object)
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&& !bfd_check_format (abfd, bfd_core))
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return NULL;
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if (abfd->build_id != NULL)
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return abfd->build_id;
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/* No build-id */
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return NULL;
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}
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/* See build-id.h. */
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int
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build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check)
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{
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const struct bfd_build_id *found;
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int retval = 0;
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found = build_id_bfd_get (abfd);
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if (found == NULL)
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warning (_("File \"%s\" has no build-id, file skipped"),
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bfd_get_filename (abfd));
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else if (found->size != check_len
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|| memcmp (found->data, check, found->size) != 0)
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warning (_("File \"%s\" has a different build-id, file skipped"),
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bfd_get_filename (abfd));
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else
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retval = 1;
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return retval;
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}
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/* Helper for build_id_to_debug_bfd. LINK is a path to a potential
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build-id-based separate debug file, potentially a symlink to the real file.
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If the file exists and matches BUILD_ID, return a BFD reference to it. */
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static gdb_bfd_ref_ptr
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build_id_to_debug_bfd_1 (const std::string &link, size_t build_id_len,
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const bfd_byte *build_id)
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{
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if (separate_debug_file_debug)
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{
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gdb_printf (gdb_stdlog, _(" Trying %s..."), link.c_str ());
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gdb_flush (gdb_stdlog);
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}
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/* lrealpath() is expensive even for the usually non-existent files. */
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gdb::unique_xmalloc_ptr<char> filename_holder;
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const char *filename = nullptr;
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if (startswith (link, TARGET_SYSROOT_PREFIX))
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filename = link.c_str ();
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else if (access (link.c_str (), F_OK) == 0)
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{
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filename_holder.reset (lrealpath (link.c_str ()));
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filename = filename_holder.get ();
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}
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if (filename == NULL)
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{
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if (separate_debug_file_debug)
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gdb_printf (gdb_stdlog,
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_(" no, unable to compute real path\n"));
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return {};
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}
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/* We expect to be silent on the non-existing files. */
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gdb_bfd_ref_ptr debug_bfd = gdb_bfd_open (filename, gnutarget);
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if (debug_bfd == NULL)
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{
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if (separate_debug_file_debug)
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gdb_printf (gdb_stdlog, _(" no, unable to open.\n"));
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return {};
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}
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if (!build_id_verify (debug_bfd.get(), build_id_len, build_id))
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{
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if (separate_debug_file_debug)
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gdb_printf (gdb_stdlog, _(" no, build-id does not match.\n"));
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return {};
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}
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if (separate_debug_file_debug)
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gdb_printf (gdb_stdlog, _(" yes!\n"));
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return debug_bfd;
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}
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/* Common code for finding BFDs of a given build-id. This function
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works with both debuginfo files (SUFFIX == ".debug") and executable
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files (SUFFIX == ""). */
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static gdb_bfd_ref_ptr
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build_id_to_bfd_suffix (size_t build_id_len, const bfd_byte *build_id,
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const char *suffix)
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{
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/* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
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cause "/.build-id/..." lookups. */
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std::vector<gdb::unique_xmalloc_ptr<char>> debugdir_vec
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= dirnames_to_char_ptr_vec (debug_file_directory.c_str ());
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for (const gdb::unique_xmalloc_ptr<char> &debugdir : debugdir_vec)
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{
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const gdb_byte *data = build_id;
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size_t size = build_id_len;
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/* Compute where the file named after the build-id would be.
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If debugdir is "/usr/lib/debug" and the build-id is abcdef, this will
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give "/usr/lib/debug/.build-id/ab/cdef.debug". */
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std::string link = debugdir.get ();
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link += "/.build-id/";
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if (size > 0)
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{
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size--;
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string_appendf (link, "%02x/", (unsigned) *data++);
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}
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while (size-- > 0)
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string_appendf (link, "%02x", (unsigned) *data++);
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link += suffix;
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gdb_bfd_ref_ptr debug_bfd
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= build_id_to_debug_bfd_1 (link, build_id_len, build_id);
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if (debug_bfd != NULL)
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return debug_bfd;
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/* Try to look under the sysroot as well. If the sysroot is
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"/the/sysroot", it will give
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"/the/sysroot/usr/lib/debug/.build-id/ab/cdef.debug". */
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if (!gdb_sysroot.empty ())
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{
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link = gdb_sysroot + link;
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debug_bfd = build_id_to_debug_bfd_1 (link, build_id_len, build_id);
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if (debug_bfd != NULL)
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return debug_bfd;
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}
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}
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return {};
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}
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/* See build-id.h. */
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gdb_bfd_ref_ptr
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build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id)
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{
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return build_id_to_bfd_suffix (build_id_len, build_id, ".debug");
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}
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/* See build-id.h. */
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gdb_bfd_ref_ptr
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build_id_to_exec_bfd (size_t build_id_len, const bfd_byte *build_id)
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{
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return build_id_to_bfd_suffix (build_id_len, build_id, "");
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}
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/* See build-id.h. */
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std::string
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find_separate_debug_file_by_buildid (struct objfile *objfile)
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{
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const struct bfd_build_id *build_id;
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build_id = build_id_bfd_get (objfile->obfd);
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if (build_id != NULL)
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{
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if (separate_debug_file_debug)
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gdb_printf (gdb_stdlog,
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_("\nLooking for separate debug info (build-id) for "
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"%s\n"), objfile_name (objfile));
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gdb_bfd_ref_ptr abfd (build_id_to_debug_bfd (build_id->size,
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build_id->data));
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/* Prevent looping on a stripped .debug file. */
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if (abfd != NULL
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&& filename_cmp (bfd_get_filename (abfd.get ()),
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objfile_name (objfile)) == 0)
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warning (_("\"%s\": separate debug info file has no debug info"),
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bfd_get_filename (abfd.get ()));
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else if (abfd != NULL)
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return std::string (bfd_get_filename (abfd.get ()));
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}
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return std::string ();
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}
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