Ch 05: Subroutines and Stack Architecture

Examines stack memory allocation, downward growth of the stack, return address pushing, caller vs callee register preservation, and avoiding stack misalignment bugs.

222 Questions222 MCQs0 Short Questions0 Long Questions

🎯 Exam Practice Papers

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.

Showing 31 – 40 of 222 Questions

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Q31

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (PUSH SP Modification)Easy🔁⭐💡📄🎓VU🏛️VU

When the instruction `PUSH AX` is executed on a standard downward-growing x86 stack, how does the value of the Stack Pointer (`SP`) change?

💻 assembly Snippet

push ax ; SP = SP - 2, then [SS:SP] = AX

Q32

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (PUSH Execution Mechanics)Easy🔁⭐💡📄🎓VU🏛️VU

True or False: Executing the instruction `PUSH` increments the Stack Pointer (`SP`) by two before transferring a word to the top of the stack.

💻 assembly Snippet

push ax ; Decrements SP by 2, writes AX to [SS:SP]

A.True
B.False

Q33

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Stack Pointer SP Function)Easy🔁⭐💡📄🎓VU🏛️VU

The Stack Pointer (SP) is a specialized memory pointer register that implicitly points to the __________.

💻 assembly Snippet

push ax ; Decrements SP by 2, pointing to new top of stack

A.Top of the stack
B.Bottom of the stack
C.Base of the stack frame
D.Start of code segment

Q34

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Implicit SP Stack Instructions)Easy🔁⭐💡📄🎓VU🏛️VU

The Stack Pointer register (SP) is a memory pointer that is used implicitly/indirectly by a specific set of __________ (such as `PUSH`, `POP`, `CALL`, and `RET`).

💻 assembly Snippet

push ax ; SP modified implicitly by PUSH instruction
pop  bx ; SP modified implicitly by POP instruction

A.instructions
B.Pointers
C.Indexes
D.Variables

Q35

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (BP Base Pointer Function)Easy🔁⭐💡📄🎓VU🏛️VU

__________ is also a stack memory base pointer register containing the address of arguments and local variables inside the stack segment.

💻 assembly Snippet

mov ax, [bp + 4] ; Accesses parameter passed on stack via BP

A.SP
B.BP
C.PB
D.AC

Q36

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (CALL Instruction Reusability)Easy🔁⭐💡📄🎓VU🏛️VU

The __________ instruction allows temporary control flow diversion to a subroutine, enabling code reusability.

💻 assembly Snippet

call my_subroutine ; Temporarily diverts control flow to subroutine

A.CALL
B.RET
C.AND
D.XOR

Q37

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (CALL Target Operand Argument)Easy🔁⭐💡📄🎓VU🏛️VU

The `CALL` instruction takes a target memory label as an __________ and begins execution from that target location.

💻 assembly Snippet

call print_string ; 'print_string' label acts as argument

A.argument
B.Label
C.Text
D.Register

Q38

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (RET Return Instruction)Easy🔁⭐💡📄🎓VU🏛️VU

When the __________ instruction is executed inside a subroutine, it restores execution back to the instruction immediately following the initial `CALL`.

💻 assembly Snippet

my_subroutine:
    ; subroutine body
    ret ; Pops saved IP and returns

A.CALL
B.RET
C.AND
D.XOR

Q39

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (CALL and RET Subroutine Pairing)Easy🔁⭐💡📄🎓VU🏛️VU

Which pair of instructions are commonly used together to invoke and return from subroutines, despite operating independently at the hardware level?

💻 assembly Snippet

call my_func
; ...
my_func:
    ret

A.RET and ADC
B.CALL and SBB
C.CALL and RET
D.ADC and SBB

Q40

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (CALL Register Updating of IP)Easy🔁⭐💡📄🎓VU🏛️VU

The `CALL` instruction alters the normal thread of execution while preserving general-purpose registers, automatically updating which pointer register to the target address?

A.SI
B.IP
C.DI
D.SP

Ch 05: Subroutines and Stack Architecture

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

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