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QUESTION 3: Execute the given program in MARS and answer the following short questions. .text main: li $a0,5 jal func1 li $v0,1 syscall j func3 func1:

QUESTION 3: Execute the given program in MARS and answer the following short questions. .text main: li $a0,5 jal func1 li $v0,1 syscall j func3 func1:

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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QUESTION 3: Execute the given program in MARS and answer the following short questions. .text main: li $a0,5 jal func1 li $v0,1 syscall j func3 func1: addiu $sp, $sp, -8 sw $ra, 4($sp) sw $a0, 0($sp) addi $a0,$a0,5 jal func2 Iw $a0, 0($sp) Iw $ra, 4($sp) jr $ra func2: addi $a0,$a0,5 jr $ra func3: li $v0,10 syscall i. What do we need to decrement $sp by 8 in the instruction addiu $sp, $sp,-8? ii. What is the value of $a0 at the end of func2? At the end of program, the value of $a0 is 5 (printed on screen). Why? iii. func1 is supposed to free-up stack before it returns back to the caller. Write down the instruction we must use to free-up stack. iv. The program will not terminate properly if we remove the instruction Iw $ra, 4($sp). Why? v. Make changes in this program to use jalr instead of jal. Write down your changes here.
Transcribed Image Text:QUESTION 3: Execute the given program in MARS and answer the following short questions. .text main: li $a0,5 jal func1 li $v0,1 syscall j func3 func1: addiu $sp, $sp, -8 sw $ra, 4($sp) sw $a0, 0($sp) addi $a0,$a0,5 jal func2 Iw $a0, 0($sp) Iw $ra, 4($sp) jr $ra func2: addi $a0,$a0,5 jr $ra func3: li $v0,10 syscall i. What do we need to decrement $sp by 8 in the instruction addiu $sp, $sp,-8? ii. What is the value of $a0 at the end of func2? At the end of program, the value of $a0 is 5 (printed on screen). Why? iii. func1 is supposed to free-up stack before it returns back to the caller. Write down the instruction we must use to free-up stack. iv. The program will not terminate properly if we remove the instruction Iw $ra, 4($sp). Why? v. Make changes in this program to use jalr instead of jal. Write down your changes here.
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