Consider a service routine that responds to a timer interrupt. Assume that the function of this service routine is simply to increment the current value of ``clock''-- an integer stored in absolute address CLOCK. Ignore any overflow that may arise from this operation.

Below is a pseudo code for this service routine. Pseudo code of the service routine

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Load CLOCK, R1 (* loads the integer stored in address CLOCK to register R1 *)

INCREMENT R1 by 1

STORE R1, CLOCK (* stores the value in R1 to the memory location CLOCK *)

RETURN (* Pops the return address from control stack and loads it to PC *)

Questions:

(a) Point out any problems with this code, in less than 30 words.

(b) Show a corrected pseudo code.