Question

a)Complete the following LC-3 PUSH routine. Assume R6 is the stack pointer, st grows towards 0 and each element of the stack takes four memory locations PUSH ADD R6, R6, STR RO, R6, lowing operations, what are the contents of the stack? Show what the ck contains after each operation and the final stack contents. Multiply routine takes two operands off the stack, multiplies and pushes the result back on the stack push 2 push 2 multiply If the stack grows toward zero, the contents of R6 is x4000 and the following c) f operations are performed on the stack, the final value in R6 isShow your work and the stack contents after each operation. Assume that each element of the stack takes one memory

Answer 1

a) PUSH ADD R6, R6, #-1

STR R0, R6, 0

Explanation: For ADD in PUSH operations, we have to decrement the stack pointer by 1 and #-1 is denoting that and STR helps in storing the result.

b)