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A discussion of each line of the code is as follows: The first two lines declare the .data and the .text segments of our code. There is nothing after the .data segment because we have no variables to store. All of our instructions follow the .text segment. Next comes the declaration of the main: label in line 3 which is required for any code we wish to run. Lines 4-7 read in and store a value. To read a value we must make a system call (or syscall), and tell our processor we need input. Each syscall (there are many types) has an associated number. In order to make a syscall we put the call's associated number in $v0 and then execute the syscall instruction. In our case the associated number for reading in a numerical value is 5. Once a syscall finishes its return values are stored in $v0 and/or $v1. Lines 8-11 repeat the reading process but store the value in a different register. Line 12 calculates the sum of the two values we read in. Lines 13-16 handle printing out the computed sum. In this case we are using the print_int syscall whose number is 1. This syscall prints out whatever value is stored in the argument register $a0. Finally we must exit the main method. Lines 17 and 18 accomplish this by using the exit syscall. Question 1. Modify the above piece of code so it can add 3 numbers. Include your code in the report. Question 2. What modifications were needed to add the 3 numbers?

A discussion of each line of the code is as follows: The first two lines declare the .data and the .text segments of our code. There is nothing after the .data segment because we have no variables to store. All of our instructions follow the .text segment. Next comes the declaration of the main: label in line 3 which is required for any code we wish to run. Lines 4-7 read in and store a value. To read a value we must make a system call (or syscall), and tell our processor we need input. Each syscall (there are many types) has an associated number. In order to make a syscall we put the call's associated number in $v0 and then execute the syscall instruction. In our case the associated number for reading in a numerical value is 5. Once a syscall finishes its return values are stored in $v0 and/or $v1. Lines 8-11 repeat the reading process but store the value in a different register. Line 12 calculates the sum of the two values we read in. Lines 13-16 handle printing out the computed sum. In this case we are using the print_int syscall whose number is 1. This syscall prints out whatever value is stored in the argument register $a0. Finally we must exit the main method. Lines 17 and 18 accomplish this by using the exit syscall. Question 1. Modify the above piece of code so it can add 3 numbers. Include your code in the report. Question 2. What modifications were needed to add the 3 numbers?

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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PART 2. AN ASM EXAMPLE ASM Programming instructions: For this part your goal is to run some example assembly code (provided below), and then modify the code to read in and add 3 numbers instead of just 2. 1. data # variable declarations follow this line 2. text # instructions follow this line 3. main: ## Code Part 1: Get first number from user, put into $t0. ori Sv0, $0, 5 # OUR CODE BEGINS HERE: load syscall read_int into $v0. 6. syscall # make the syscall. 7. addu $t0, S0, Sv0 # move the number read into St0. ## Get second number from user, put into $t1. 9. ori Sv0, $0, 5 # load syscall read_int into $v0. 10. syscall # make the syscall. 11. addu $t1, $0, Sv0 # move the number read into $t1. 12. add $t2, $t0, $t1 # compute the sum. 13. ## Print out $t2. 14. addu $a0, $0, St2 # move the number to print into $a0. 15. ori Sv0, $0, 1 # load syscall print_int into Svo. 16. syscall # make the syscall. 17. ori Sv0, S0, 10 # syscall code 10 is for exit. 18. syscall # make the syscall. 4. 5. 8. 19. ## end of add2.asm.
Transcribed Image Text:PART 2. AN ASM EXAMPLE ASM Programming instructions: For this part your goal is to run some example assembly code (provided below), and then modify the code to read in and add 3 numbers instead of just 2. 1. data # variable declarations follow this line 2. text # instructions follow this line 3. main: ## Code Part 1: Get first number from user, put into $t0. ori Sv0, $0, 5 # OUR CODE BEGINS HERE: load syscall read_int into $v0. 6. syscall # make the syscall. 7. addu $t0, S0, Sv0 # move the number read into St0. ## Get second number from user, put into $t1. 9. ori Sv0, $0, 5 # load syscall read_int into $v0. 10. syscall # make the syscall. 11. addu $t1, $0, Sv0 # move the number read into $t1. 12. add $t2, $t0, $t1 # compute the sum. 13. ## Print out $t2. 14. addu $a0, $0, St2 # move the number to print into $a0. 15. ori Sv0, $0, 1 # load syscall print_int into Svo. 16. syscall # make the syscall. 17. ori Sv0, S0, 10 # syscall code 10 is for exit. 18. syscall # make the syscall. 4. 5. 8. 19. ## end of add2.asm.
A discussion of each line of the code is as follows: The first two lines declare the .data and the text segments of our code. There is nothing after the .data segment because we have no variables to store. All of our instructions follow the .text segment. Next comes the declaration of the main: label in line 3 which is required for any code we wish to run. Lines 4-7 read in and store a value. To read a value we must make a system call (or syscall), and tell our processor we need input. Each syscall (there are many types) has an associated number. In order to make a syscall we put the call's associated number in $v0 and then execute the syscall instruction. In our case the associated number for reading in a numerical value is 5. Once a syscall finishes its return values are stored in $v0 and/or $v1. Lines 8-11 repeat the reading process but store the value in a different register. Line 12 calculates the sum of the two values we read in. Lines 13-16 handle printing out the computed sum. In this case we are using the print_int syscall whose number is 1. This syscall prints out whatever value is stored in the argument register $a0. Finally we must exit the main method. Lines 17 and 18 accomplish this by using the exit syscall. Question 1. Modify the above piece of code so it can add 3 numbers. Include your code in the report. Question 2. What modifications were needed to add the 3 numbers?
Transcribed Image Text:A discussion of each line of the code is as follows: The first two lines declare the .data and the text segments of our code. There is nothing after the .data segment because we have no variables to store. All of our instructions follow the .text segment. Next comes the declaration of the main: label in line 3 which is required for any code we wish to run. Lines 4-7 read in and store a value. To read a value we must make a system call (or syscall), and tell our processor we need input. Each syscall (there are many types) has an associated number. In order to make a syscall we put the call's associated number in $v0 and then execute the syscall instruction. In our case the associated number for reading in a numerical value is 5. Once a syscall finishes its return values are stored in $v0 and/or $v1. Lines 8-11 repeat the reading process but store the value in a different register. Line 12 calculates the sum of the two values we read in. Lines 13-16 handle printing out the computed sum. In this case we are using the print_int syscall whose number is 1. This syscall prints out whatever value is stored in the argument register $a0. Finally we must exit the main method. Lines 17 and 18 accomplish this by using the exit syscall. Question 1. Modify the above piece of code so it can add 3 numbers. Include your code in the report. Question 2. What modifications were needed to add the 3 numbers?
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