scripts/gdb: provide exception catching parser

If we attempt to read a value that is not available to GDB, an exception is raised. Most of the time, this is a good thing; however on occasion we will want to be able to determine if a symbol is available. By catching the exception to simply return None, we can determine if we tried to read an invalid value, without the exception taking our execution context away from us Link: http://lkml.kernel.org/r/c72b25c06fc66e1d68371154097e2cbb112555d8.1462865983.git.jan.kiszka@siemens.com Signed-off-by: Kieran Bingham <[email protected]> Signed-off-by: Jan Kiszka <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kyagi · May 24, 2016 · e78f3d7 · e78f3d7
1 parent 619ccaf
commit e78f3d7
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/scripts/gdb/linux/utils.py b/scripts/gdb/linux/utils.py
@@ -154,3 +154,10 @@ def probe_kgdb():
         if gdbserver_type is not None and hasattr(gdb, 'events'):
             gdb.events.exited.connect(exit_handler)
     return gdbserver_type
+
+
+def gdb_eval_or_none(expresssion):
+    try:
+        return gdb.parse_and_eval(expresssion)
+    except:
+        return None