rtos/hwthread: add hardware-thread pseudo rtos

This patch adds "hwthread", a pseudo rtos that represents cpu cores
in an SMP system as threads to gdb. This allows to debug SMP
system kernels in a more sensible manner and removes the current
atrocities of switching gdb manually between CPU cores to update
the context.

Change-Id: Ib781c6c34097689d21d9e02011e4d74a4a742379
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/3999
Tested-by: jenkins
Reviewed-by: Tim Newsome <tim@sifive.com>
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
Reviewed-by: Graham Sanderson <graham.sanderson@gmail.com>

src/rtos/rtos.c

@@ -37,6 +37,7 @@ extern struct rtos_type embKernel_rtos;
 extern struct rtos_type mqx_rtos;
 extern struct rtos_type uCOS_III_rtos;
 extern struct rtos_type nuttx_rtos;
+extern struct rtos_type hwthread_rtos;
 
 static struct rtos_type *rtos_types[] = {
 	&ThreadX_rtos,
@@ -49,6 +50,7 @@ static struct rtos_type *rtos_types[] = {
 	&mqx_rtos,
 	&uCOS_III_rtos,
 	&nuttx_rtos,
+	&hwthread_rtos,
 	NULL
 };