i need solution of part 1 and 2

8. Suppose the SysTick interrupt occurs when PC=008000044,XPSR=000000020, SP=020000200,LR=008001000, and register Ri=i,i=0,1,2,,12. (1) Show the stack contents and the value of PC and SP when immediately entering the SysTick interrupt service routine. (2) When executing the instruction "BX LR ", how does the processor know whether it is exiting a standard subroutine or an interrupt service routine? What operations does the processor perform when a standard subroutine exits? What operations does the processor perform when an interrupt service routine exits