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

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CS401 - Computer Architecture and Assembly Language Programming Examination Practice

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

Showing 51 – 60 of 222 Questions

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Q51

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Local Variable Stack Allocation)Medium🔁⭐💡📄🎓VU🏛️VU

In assembly language subroutine stack frame management, how are local variables allocated on the stack?

💻 assembly Snippet

push bp
mov  bp, sp
sub  sp, 4 ; Allocates space for 4 bytes of local variables on stack
; ...
mov  sp, bp ; Deallocates local variables
pop  bp
ret

A.By subtracting the required byte size from SP
B.By adding the required byte size to SP
C.By pushing segment registers onto the stack
D.By calling INT 0x21

Q52

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Local Variable Scope in Subroutine)Easy🔁⭐💡📄🎓VU🏛️VU

Local variables are variables that are defined and used exclusively within a __________.

A.Subroutine
B.Program
C.CALL
D.Label

Q53

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

To transfer control back from a subroutine to the caller, the standard near `RET` instruction takes how many explicit parameters/arguments?

💻 assembly Snippet

ret ; Pops saved return address from stack (0 operands)

A.1 argument
B.2 arguments
C.3 arguments
D.No arguments

Q54

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

In 16-bit x86 architecture, what is the maximum number of parameters a subroutine can receive directly through general-purpose registers (AX, BX, CX, DX, SI, DI, BP)?

Q55

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (RET Instruction Argument Count)Easy🔁⭐💡📄🎓VU🏛️VU

How many explicit parameters/arguments does the standard `RET` (Return from subroutine) instruction take?

💻 assembly Snippet

ret ; Pops saved IP from stack (0 parameters)

Q56

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

Describe the function and operational steps performed by the `PUSH` instruction on the stack.

💻 assembly Snippet

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

Q57

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

The physical memory address of data located on the execution stack is calculated using which segment-offset register combination?

A.SS:SP combination
B.SS:SI combination
C.ES:BP combination
D.ES:SP combination

Q58

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

Upon execution of the standard near return instruction `RET`, how is the Stack Pointer (`SP`) modified?

💻 assembly Snippet

ret ; Pops 2-byte IP offset from [SS:SP], SP = SP + 2

A.SP is incremented by 2
B.SP is decremented by 2
C.SP is incremented by 1
D.SP is decremented by 1

Q59

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (RET n Stack Pointer Increment)Easy🔁⭐💡📄🎓VU🏛️VU

What structural changes occur to the Stack Pointer (`SP`) register upon executing the instruction `RET 2`?

💻 assembly Snippet

ret 2 ; Pops 2-byte IP, then adds 2 bytes to SP -> Total SP = SP + 4

Q60

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

When executing a far return instruction `RETF`, into which CPU register is the first 16-bit word popped from the stack loaded?

💻 assembly Snippet

retf ; Pops IP first, then CS second

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

Ch 05: Subroutines and Stack Architecture

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

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CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

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