📑 CHAPTER PRACTICE

CS401 - Computer Architecture and Assembly Language Programming – Subroutines

Practice 10 verified multiple choice questions per batch with instant answer reveal and comprehensive solutions.

Showing 1 – 10 of 222 Questions

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Q1📝 Short Q📑 Lec 5Easy⭐High-Yield💡Conceptual

How many parameters can a subroutine receive through the stack in x86 assembly language?

💻 assembly Snippet

push param1
push param2
push param3
call my_subroutine

Q2📝 Short Q📑 Lec 5Medium🔁Repeated⭐High-Yield💡Conceptual

Given initial register values AX = 0x3412, BX = 0x7856, CX = 0x1CAB, and SP = 0x0100, trace the contents of AX, BX, CX, and SP after executing: PUSH AX; PUSH BX; XCHG AX, CX; POP CX.

💻 assembly Snippet

mov ax, 0x3412
mov bx, 0x7856
mov cx, 0x1CAB
mov sp, 0x0100
push ax
push bx
xchg ax, cx
pop cx

Q3📝 Short Q📑 Lec 5Medium🔁Repeated⭐High-Yield💡Conceptual

Given initial values AX = 0x3412, BX = 0x7856, CX = 0x1CAB, and SP = 0x0100, trace the contents of AX, BX, CX, and SP after executing: PUSH AX; PUSH BX; POP AX; POP CX.

💻 assembly Snippet

; Initial: AX=0x3412, BX=0x7856, CX=0x1CAB, SP=0x0100
push ax
push bx
pop ax
pop cx

Q4📝 Short Q📑 Lec 5Medium🔁Repeated⭐High-Yield💡Conceptual

How is the value of the IP register saved and updated when a CALL instruction is executed?

💻 assembly Snippet

call my_subroutine
mov ax, 1
my_subroutine:
ret

Q5📝 Short Q📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

Describe the operation of PUSH and POP instructions with the help of an assembly language example.

💻 assembly Snippet

push ax
pop bx

Q6📝 Short Q📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

Why are procedures used in assembly language, and what must be the last executable instruction in a procedure?

💻 assembly Snippet

my_proc:
    ; procedure body
    ret

Q7📝 Short Q📑 Lec 5Medium🔁Repeated⭐High-Yield💡Conceptual

Provide valid x86 assembly instruction(s) to move the value located at the top of the stack into the IP (Instruction Pointer) register.

💻 assembly Snippet

ret

Q8❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

How many prevalent calling conventions exist in assembly language programming (specifically x86 CS401)?

💻 assembly Snippet

push param2
push param1
call my_subroutine
add sp, 4

Q9❓ MCQ📑 Lec 5Medium🔁Repeated⭐High-Yield💡Conceptual

In NASM assembly language, an imported symbol is declared using the ________ directive, while an exported symbol is declared using the ________ directive.

💻 assembly Snippet

extern my_external_func
global my_public_func

A.EXTERN directive, GLOBAL directive
B.GLOBAL directive, EXTERN directive
C.IMPORT directive, EXPORT directive
D.PUBLIC directive, EXTERN directive

Q10❓ MCQ📑 Lec 5Medium🔁Repeated⭐High-Yield💡Conceptual

Read the following x86 assembly stack framing sequence and determine the final effect on the BP register value: push bp mov bp, sp sub sp, 2 mov sp, bp pop bp

💻 assembly Snippet

push bp
mov bp, sp
sub sp, 2
mov sp, bp
pop bp

A.bp will retain its original value
B.Value of sp will move to bp
C.Value of bp will be less than sp
D.Value of bp will be zero

CS401 - Computer Architecture and Assembly Language Programming – Subroutines

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