gdb-python: Update so 'rtems task' lists the classic tasks.

This is a first pass at cleaning up the support. To use:

 $ waf configure --prefix=$HOME/development/rtems/4.11
 $ waf build install

Start GDB and break at Init:

 (gdb) py import rtems
 (gdb) rtems task

will list the classic API tasks.

tools/gdb/python/percpu.py

@@ -0,0 +1,57 @@
+# RTEMS Tools Project (http://www.rtems.org/)
+# Copyright 2014 Chris Johns (chrisj@rtems.org)
+# All rights reserved.
+#
+# This file is part of the RTEMS Tools package in 'rtems-tools'.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+#
+# RTEMS Per CPU Table
+#
+
+import gdb
+
+import configuration
+
+def _table(cpu):
+    max_cpus = configuration.maximum_processors()
+    if cpu >= max_cpus:
+        raise IndexError('cpu index out of range (%d)' % (max_cpus))
+    return gdb.parse_and_eval('_Per_CPU_Information[%d].per_cpu' % (cpu))
+
+def get(cpu):
+    return _table(cpu)
+
+def thread_active(thread):
+    for cpu in range(0, configuration.maximum_processors()):
+        if thread == _table(cpu)['executing']:
+            return cpu
+    return -1
+
+def thread_heir(thread):
+    for cpu in range(0, configuration.maximum_processors()):
+        if thread == _table(cpu)['heir']:
+            return cpu
+    return -1