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 41 – 50 of 222 Questions

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Q41

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Stack Data Structure Definition)Easy🔁⭐💡📄🎓VU🏛️VU

A stack is a fundamental __________ that operates in a Last-In, First-Out (LIFO / FILO) manner.

A.Program
B.data structure
C.Heap
D.None of the Given

Q42

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (RET n Callee Stack Parameter Cleanup)Medium🔁⭐💡📄🎓VU🏛️VU

If the __________ instruction variant is not available, callee-side stack parameter cleanup becomes a complicated multi-step process.

💻 assembly Snippet

ret 4 ; Pops return address, then adds 4 bytes to SP to discard 2 word parameters

A.CALL
B.SBB
C.RET n
D.None of the given

Q43

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

True or False: When the stack eventually becomes full in 16-bit x86 architecture, the Stack Pointer (SP) will reach 0x0000, and subsequent PUSH operations will wrap around to 0xFFFE, producing stack overflow and unexpected memory corruption.

💻 assembly Snippet

push ax ; When SP = 0x0000, pushing decrements SP to 0xFFFE (stack wraparound)

A.True
B.False

Q44

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

When the stack becomes full and pushing data past offset 0x0000 causes SP to wrap around and overwrite existing stack frame data, this situation is called stack __________.

A.Overflow
B.Leakage
C.Error
D.Pointer

Q45

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

The `POP` operation copies the 16-bit word from the current top of the stack into its specified __________.

💻 assembly Snippet

pop ax ; Copies word at [SS:SP] into operand register AX

A.Register
B.operand
C.RET n
D.Pointer

Q46

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

Which x86 assembly instruction decrements SP (the Stack Pointer) by two and then transfers a word from the source operand to the top of the stack?

💻 assembly Snippet

push ax ; Decrements SP by 2, writes AX to top of stack

A.PUSH
B.POP
C.CALL
D.RET

Q47

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

Executing `POP` transfers the word at the top of the stack (pointed to by SP) to the destination operand and then __________ SP by two to point to the new top of the stack.

💻 assembly Snippet

pop ax ; Reads word at [SS:SP] and increments SP by 2

A.increments
B.decrements
C.++
D.--

Q48

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

To preserve register values across subroutine calls, the standard technique is to use __________ and __________ operations to save caller registers on the stack and restore them before returning.

💻 assembly Snippet

subroutine:
    push ax ; Save AX
    push bx ; Save BX
    ; ... subroutine work ...
    pop  bx ; Restore BX
    pop  ax ; Restore AX
    ret

A.POP, ADC
B.CALL, RET
C.CALL, RET n
D.PUSH, POP

Q49

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Retrieving Stack Arguments via POP)Easy🔁⭐💡📄🎓VU🏛️VU

When parameters are passed to a subroutine on the stack, the straightforward method to retrieve them inside the subroutine is to __________ them off the stack.

💻 assembly Snippet

pop ax ; Retrieves top parameter off the stack into AX

A.PUSH
B.POP
C.CALL
D.Register

Q50

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Standard Stack Frame Prologue)Easy🔁⭐💡📄🎓VU🏛️VU

In standard stack frame creation, executing `push bp` performs which action?

💻 assembly Snippet

push bp     ; Pushes old BP onto stack
mov  bp, sp ; Sets up new stack frame pointer

A.sending bp copy to stack
B.making bp copy from stack
C.pushing bp on the stack
D.doing nothing

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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