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/Makefile.am

@@ -17,6 +17,7 @@ noinst_LTLIBRARIES += %D%/librtos.la
 	%D%/mqx.c \
 	%D%/uCOS-III.c \
 	%D%/nuttx.c \
+	%D%/hwthread.c \
 	%D%/rtos.h \
 	%D%/rtos_standard_stackings.h \
 	%D%/rtos_ecos_stackings.h \