rtos: Freescale MQX rtos support

ARMv7E-M (CortexM4) architecture

- fix position offset of r2,r3 registers on exception stack
- switch 'calloc' arguments
- remove prototypes of internal function and typedefs
- add NULL check for alloc functions
- remove last line of license "Franklin Street, Fifth Floor"
  because of 'checkpatch' validation
- environment: jlink + twrk60n512

Change-Id: I70840ded15b17dd945ca190ce31e2775078da2d9
Signed-off-by: Marian Cingel <cingel.marian@gmail.com>
Reviewed-on: http://openocd.zylin.com/2353
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/rtos/rtos_mqx_stackings.h

@@ -0,0 +1,32 @@
+/***************************************************************************
+ *   Copyright (C) 2014 by Marian Cingel                                   *
+ *   cingel.marian@gmail.com                                               *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.                                        *
+ ***************************************************************************/
+
+#ifndef INCLUDED_RTOS_MQX_STACKINGS_H_
+#define INCLUDED_RTOS_MQX_STACKINGS_H_
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "rtos.h"
+
+extern const struct rtos_register_stacking rtos_mqx_arm_v7m_stacking;
+
+#endif	/* ifndef INCLUDED_RTOS_MQX_STACKINGS_H_ */
+