Subroutines

Lecture 13: Subroutines

222 Questions172 MCQs45 Short Questions5 Long Questions

Showing 1 – 10 of 222 Questions

Page 1 of 23

Q1📝 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

Q2📝 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

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

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

Q5📝 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

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

Analyze the following x86 assembly code sequence and describe its final effect on the value stored in the BP register: push bp mov bp, sp sub sp, 2 mov bp, sp pop bp

💻 assembly Snippet

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

Subroutines

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