$7.$ a$)$ Classify the barrel shifter instructions in ARM. $(2$M$)$

b$)$ Extend the concept of single register load and store with values of registers after instruction

is executed. $(3$M$)$

R$0=0$x$00000000,$ R$1=0$x$00090000,$ mem$32[0$x$00009000]=0$x$11111111$

mem$32[0$x$00009004]=0$x$22222222$

LDR R$0,[$R$1,$ #$4]!$

c$)$ Develop an assembly language program such that processor can go from system mode to

user mode and from user mode to system mode. Show that the previous executing program can

be resumed even after the mode change. $(5$M$)$