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GATE Computer Science (CS) 2015 Shift 2 Solved Paper

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Question : 54

Total: 65

Consider a processor with byte - addressable memory. Assume that all registers, including Program Counter (PC) and Program Status Word (PSW), are of size 2 bytes. A stack in the main memory is implemented from memory location (0100)₁₆ and it grows upward. The stack pointer (SP) points to the top element of the stack. The current value of SP is (016E)₁₆. The CALL instruction is of two words, the first word is the op - code and the second word is the starting address of the subroutine (one word = 2 bytes). The CALL instruction is implemented as follows:
• Store the current value of PC in the stack
• Store the value of PSW register in the stack
• Load the starting address of the subroutine in PC
The content of PC just before the fetch of a CALL instruction is (5FA0)₁₆. After execution of the CALL instruction, the value of the stack pointer is

(016A)₁₆
(016C)₁₆
(0170)₁₆
(0172)₁₆

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