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 91 – 100 of 222 Questions

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Q91

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

Describe the working mechanics of the `CALL` instruction in relation to the stack data structure.

💻 assembly Snippet

; CALL mechanics:
; 1. SP = SP - 2
; 2. [SS:SP] = IP (Return Address)
; 3. IP = target_label_offset

Q92

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

Which x86 instruction transfers the word at the current top of the stack (pointed to by `SS:SP`) to the destination operand and then increments `SP` by two?

💻 assembly Snippet

pop ax ; Copies [SS:SP] into AX, then increments SP by 2

A.push
B.pop
C.call
D.none of given

Q93

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

True or False: The `RET` instruction does NOT pop the word at the top of the stack (pointed to by `SS:SP`) into the Instruction Pointer, but merely increments `SP` by two.

💻 assembly Snippet

ret ; Pops top of stack into IP, restoring execution flow

A.true
B.false

Q94

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

True or False: The operations for placing items onto the stack and removing them from the stack are called `push` and `ret`.

💻 assembly Snippet

push ax ; Pushes item onto stack
pop bx  ; Removes item from stack

A.true
B.false

Q95

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

True or False: The operation of `push ax` increments the Stack Pointer by 2 (`SP <- SP + 2`) before moving `AX` to `[SS:SP]`.

💻 assembly Snippet

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

A.true
B.false

Q96

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

In standard x86 subroutine parameter cleanup mechanisms using the `RET n` instruction, parameters are removed from the stack by the __________.

💻 assembly Snippet

ret 4 ; Callee pops return address and adds 4 to SP to remove parameters

A.caller
B.callee
C.caller and callee
D.none of given

Q97

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

The Stack Pointer (`SP`) is a dedicated memory pointer register that is manipulated implicitly by a set of stack __________ (such as `PUSH`, `POP`, `CALL`, and `RET`).

💻 assembly Snippet

push ax ; Implicitly decrements SP by 2
pop bx  ; Implicitly increments SP by 2

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

Q98

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

In addition to `SP`, which memory pointer register is specifically designed to access parameter data and local variables stored in the stack frame?

💻 assembly Snippet

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

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

Q99

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

Which x86 assembly instruction allows temporary diversion of execution flow to a subroutine, enabling modularity and reusability of code?

💻 assembly Snippet

call my_subroutine ; Temporarily diverts execution to subroutine

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

Q100

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

The `CALL` instruction accepts a target subroutine label as its __________ and begins execution from that label address.

💻 assembly Snippet

call print_string ; 'print_string' label acts as the argument

A.argument
B.Lable
C.TXt
D.Register

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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