commit de33df66fc64edf55aa81a7d08adccf911aa4fdf
Author: Joel Brobecker <brobecker@adacore.com>
Date:   Tue Apr 14 15:23:25 2009 -0700

        * stack.c (do_gdb_disassembly): Print an error message if an error
        was thrown while trying to perform the disassembly.

diff --git a/gdb/stack.c b/gdb/stack.c
index dfe3900..bbeff2c 100644
--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -507,6 +507,21 @@ do_gdb_disassembly (int how_many, CORE_ADDR low, CORE_ADDR high)
     {
       gdb_disassembly_stub (&args);
     }
+  /* If an exception was thrown while doing the disassembly, print
+     the error message, to give the user a clue of what happened.  */
+  if (exception.reason == RETURN_ERROR)
+    {
+      if (exception.error == MEMORY_ERROR)
+	{
+	  /* For memory errors, prefer a short error message over
+	     the error message provided in the exception.  */
+	  gdb_flush (gdb_stdout);
+	  gdb_flush (gdb_stderr);
+	  fprintf_filtered (gdb_stderr, _("(cannot read memory)\n"));
+	}
+      else
+	exception_print (gdb_stderr, exception);
+    }
 }
 
 /* Print information about frame FRAME.  The output is format according