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.

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📝 Short Q📘 CS401📑 Lec 5🏷️ 5.3. StackEasy🔁⭐💡📄🎓VU🏛️VU

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

💻 assembly Snippet

push ax
pop bx

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.1. Program FlowMedium🔁⭐💡📄🎓VU🏛️VU

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

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.3. StackMedium🔁⭐💡📄🎓VU🏛️VU

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

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.3. StackMedium🔁⭐💡📄🎓VU🏛️VU

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

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.3. StackEasy⭐💡📄🎓VU🏛️VU

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

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.1. SubroutinesEasy🔁⭐💡📄🎓VU🏛️VU

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

📝 Short Q📘 CS401📑 Lec 5🏷️ 5.1. Program FlowMedium🔁⭐💡📄🎓VU🏛️VU

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

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.2. Calling ConventionsEasy🔁⭐💡📄🎓VU🏛️VU

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

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.3. Modular ProgrammingMedium🔁⭐💡📄🎓VU🏛️VU

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📘 CS401📑 Lec 5🏷️ 5.1. Stack OperationsMedium🔁⭐💡📄🎓VU🏛️VU

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

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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