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authorTristan Gingold <gingold@adacore.com>2009-12-14 12:50:39 +0000
committerTristan Gingold <gingold@adacore.com>2009-12-14 12:50:39 +0000
commit874f57650c1c8be126f9f637fc6cd09af7b3ade8 (patch)
tree8097283d62d333311d146b0497e228629c1ef421 /gdb/elfread.c
parent3aa4238e2615dcd93c7f437e00645b4f413aa749 (diff)
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2009-12-11 Tristan Gingold <gingold@adacore.com>
* symfile.h (find_separate_debug_file_by_buildid): Remove prototype. (bfd_open_maybe_remote): New prototype. * symfile.c (bfd_open_maybe_remote): New function. (separate_debug_file_exists, reread_symbols): Use it. (struct build_id, build_id_bfd_get, build_id_verify) (build_id_to_debug_filename) (find_separate_debug_file_by_buildid): Move these ... * elfread.c (struct build_id) (build_id_bfd_get, build_id_verify, build_id_to_debug_filename) (find_separate_debug_file_by_buildid): ... here.
Diffstat (limited to 'gdb/elfread.c')
-rw-r--r--gdb/elfread.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/gdb/elfread.c b/gdb/elfread.c
index a47e687..5e4e473b 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -568,6 +568,157 @@ elf_symtab_read (struct objfile *objfile, int type,
}
}
+struct build_id
+ {
+ size_t size;
+ gdb_byte data[1];
+ };
+
+/* Locate NT_GNU_BUILD_ID from ABFD and return its content. */
+
+static struct build_id *
+build_id_bfd_get (bfd *abfd)
+{
+ struct build_id *retval;
+
+ if (!bfd_check_format (abfd, bfd_object)
+ || bfd_get_flavour (abfd) != bfd_target_elf_flavour
+ || elf_tdata (abfd)->build_id == NULL)
+ return NULL;
+
+ retval = xmalloc (sizeof *retval - 1 + elf_tdata (abfd)->build_id_size);
+ retval->size = elf_tdata (abfd)->build_id_size;
+ memcpy (retval->data, elf_tdata (abfd)->build_id, retval->size);
+
+ return retval;
+}
+
+/* Return if FILENAME has NT_GNU_BUILD_ID matching the CHECK value. */
+
+static int
+build_id_verify (const char *filename, struct build_id *check)
+{
+ bfd *abfd;
+ struct build_id *found = NULL;
+ int retval = 0;
+
+ /* We expect to be silent on the non-existing files. */
+ abfd = bfd_open_maybe_remote (filename);
+ if (abfd == NULL)
+ return 0;
+
+ found = build_id_bfd_get (abfd);
+
+ if (found == NULL)
+ warning (_("File \"%s\" has no build-id, file skipped"), filename);
+ else if (found->size != check->size
+ || memcmp (found->data, check->data, found->size) != 0)
+ warning (_("File \"%s\" has a different build-id, file skipped"), filename);
+ else
+ retval = 1;
+
+ if (!bfd_close (abfd))
+ warning (_("cannot close \"%s\": %s"), filename,
+ bfd_errmsg (bfd_get_error ()));
+
+ xfree (found);
+
+ return retval;
+}
+
+static char *
+build_id_to_debug_filename (struct build_id *build_id)
+{
+ char *link, *debugdir, *retval = NULL;
+
+ /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */
+ link = alloca (strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1
+ + 2 * build_id->size + (sizeof ".debug" - 1) + 1);
+
+ /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
+ cause "/.build-id/..." lookups. */
+
+ debugdir = debug_file_directory;
+ do
+ {
+ char *s, *debugdir_end;
+ gdb_byte *data = build_id->data;
+ size_t size = build_id->size;
+
+ while (*debugdir == DIRNAME_SEPARATOR)
+ debugdir++;
+
+ debugdir_end = strchr (debugdir, DIRNAME_SEPARATOR);
+ if (debugdir_end == NULL)
+ debugdir_end = &debugdir[strlen (debugdir)];
+
+ memcpy (link, debugdir, debugdir_end - debugdir);
+ s = &link[debugdir_end - debugdir];
+ s += sprintf (s, "/.build-id/");
+ if (size > 0)
+ {
+ size--;
+ s += sprintf (s, "%02x", (unsigned) *data++);
+ }
+ if (size > 0)
+ *s++ = '/';
+ while (size-- > 0)
+ s += sprintf (s, "%02x", (unsigned) *data++);
+ strcpy (s, ".debug");
+
+ /* lrealpath() is expensive even for the usually non-existent files. */
+ if (access (link, F_OK) == 0)
+ retval = lrealpath (link);
+
+ if (retval != NULL && !build_id_verify (retval, build_id))
+ {
+ xfree (retval);
+ retval = NULL;
+ }
+
+ if (retval != NULL)
+ break;
+
+ debugdir = debugdir_end;
+ }
+ while (*debugdir != 0);
+
+ return retval;
+}
+
+static char *
+find_separate_debug_file_by_buildid (struct objfile *objfile)
+{
+ asection *sect;
+ char *basename, *name_copy, *debugdir;
+ char *dir = NULL;
+ char *debugfile = NULL;
+ char *canon_name = NULL;
+ bfd_size_type debuglink_size;
+ unsigned long crc32;
+ int i;
+ struct build_id *build_id;
+
+ build_id = build_id_bfd_get (objfile->obfd);
+ if (build_id != NULL)
+ {
+ char *build_id_name;
+
+ build_id_name = build_id_to_debug_filename (build_id);
+ xfree (build_id);
+ /* Prevent looping on a stripped .debug file. */
+ if (build_id_name != NULL && strcmp (build_id_name, objfile->name) == 0)
+ {
+ warning (_("\"%s\": separate debug info file has no debug info"),
+ build_id_name);
+ xfree (build_id_name);
+ }
+ else if (build_id_name != NULL)
+ return build_id_name;
+ }
+ return NULL;
+}
+
/* Scan and build partial symbols for a symbol file.
We have been initialized by a call to elf_symfile_init, which
currently does nothing.