GATE 2001

Question 10

Suppose a processor does not have any stack pointer register. Which of the following statements is true?

A	It cannot have subroutine call instruction
B	It can have subroutine call instruction, but no nested subroutine calls
C	Nested subroutine calls are possible, but interrupts are not
D	All sequences of subroutine calls and also interrupts are possible

Question 10 Explanation:

If stack pointer register is not available then activation records in the stack cannot be created. So it cannot have subroutine call instruction.

Correct Answer: A

Question 10 Explanation:

If stack pointer register is not available then activation records in the stack cannot be created. So it cannot have subroutine call instruction.