#define portSAVE_CONTEXT()													\
{																			\
	extern volatile void * volatile pxCurrentTCB;							\
	extern volatile unsigned portLONG ulCriticalNesting;					\
																			\
	/* Push R0 as we are going to use the register. */						\
	__asm volatile (														\
	"STMDB	SP!, {R0}												\n\t"	\
																			\
	/* Set R0 to point to the task stack pointer. */						\
	"STMDB	SP,{SP}^	\n\t"	/* ^ means get the user mode SP value. */	\
	/*"NOP															\n\t" */\
	"SUB	SP, SP, #4												\n\t"	\
	"LDMIA	SP!,{R0}												\n\t"	\
																			\
	/* Push the return address onto the stack. */							\
	"STMDB	R0!, {LR}												\n\t"	\
																			\
	/* Now we have saved LR we can use it instead of R0. */					\
	"MOV	LR, R0													\n\t"	\
																			\
	/* Pop R0 so we can save it onto the system mode stack. */				\
	"LDMIA	SP!, {R0}												\n\t"	\
																			\
	/* Push all the system mode registers onto the task stack. */			\
	"STMDB	LR,{R0-LR}^												\n\t"	\
	"NOP															\n\t"	\
	"SUB	LR, LR, #60												\n\t"	\
																			\
	/* Push the SPSR onto the task stack. */								\
	"MRS	R0, SPSR												\n\t"	\
	"STMDB	LR!, {R0}												\n\t"	\
																			\
	"LDR	R0, =ulCriticalNesting									\n\t"	\
	"LDR	R0, [R0]												\n\t"	\
	"STMDB	LR!, {R0}												\n\t"	\
																			\
	/* Store the new top of stack for the task. */							\
	"LDR	R0, =pxCurrentTCB										\n\t"	\
	"LDR	R0, [R0]												\n\t"	\
	"STR	LR, [R0]												\n\t"	\
	);																		\
	( void ) ulCriticalNesting;												\
	( void ) pxCurrentTCB;													\
}