The file assign2.asm holds a partial program. The purpose of the program is to r

Question

The file assign2.asm holds a partial program. The purpose of the program is to read in a list of 10 integers and then print them out. There are 4 functions in the program; 2 of which you are to complete. Main: This function will call getdata and print. Main is complete and should not be changed. Getdata: This function reads 10 integers and stores them into memory. There is one parameter ($a0) which holds the address of where the list of numbers is to be stored. Getdata calls the function printstr to print the prompt. Getdata is complete and should not be changed. Printstr: This function is to print a string. There is one parameter ($a0) which holds the address of the string to print. You are to complete this function so it performs as required. This function is call from the getdata function and the print function. Print: This function is to print the list of integers. The integers must all be on the same line of output and be separated by a comma and space (already in the data segment). See the example input and output below. This function must call the printstr function to print the comma string. Remember that as this function calls another, it must save and restore the $ra

Explanation / Answer

Code: (Explanation in comments / Modified code in bold)

# add your name and comments

.data

.space 40 # set aside 40 bytes for 10 integers

prompt: .asciiz "Enter a number " # address 0x10010028

comma: .asciiz ", " # address 0x10010038

.globl main

.text

main:

lui $a0, 0x1001 # get start of data segment

jal getdata # call getdata function

lui $a0, 0x1001 # get start of data segment

jal print # call print function

ori $v0, $0, 10 # set command to exit

syscall # end program

# printstr

# paramters: $a0 holds address of string to print

# purpose: print the string parameter

printstr:

#to be completed

li $v0, 4 # set command to print string

la $a0, prompt # load address of string

syscall # print string

#################

jr $ra # return from call

getdata:

addi $sp, $sp, -4 # allocate space on stack

sw $ra, 0($sp) # save $ra

ori $t1, $a0, 0 # address of array

lui $t1, 0x1001 #start of data

ori $a0, $a0, 0x0028 # address of prompt

ori $t0, $0, 10 # counter

top: beq $t0, $0, ret # while not 0

jal printstr # call function to print prompt

ori $v0, $0, 5 # set command to read integer

syscall # read int

sw $v0, 0($t1) # save int in memory

addi $t1, $t1, 4 # increment to next location

addi $t0, $t0, -1 # decrement counter

j top # repeat

ret: lw $ra, 0($sp) # restore return address

addi $sp, $sp, 4 # clean up stack

jr $ra # return from call

# print

# parameter: $a0 holds address of list in memory

# purpose: print the list separated by commas

print:

#to be completed

li $t0, 1 # initialize count variable

li $v0, 1 # set command to print integer

ori $t1, $a0, 0 # address of array

lw $a0, 0($t1) # load word from array

syscall # print integer output

loop: # loop to print all values of array

addi $t0, $t0, 1 # decrement count variable

addi $t1, $t1, 4 # point to next element of array

li $v0, 4 # set command to print string

la $a0, comma # address of string

syscall # print comma and space

lw $a0, 0($t1) # load element of array

li $v0, 1 # set command to print integer

syscall # print integer output

bne $t0, 10, loop # iterate loop till all elements are printed

#########################

jr $ra # return from call

Output:

Enter a number 10
Enter a number 20
Enter a number 30
Enter a number 40
Enter a number 50
Enter a number 60
Enter a number 70
Enter a number 80
Enter a number 90
Enter a number 100
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
-- program is finished running --

Hope it is clear. Do upvote :)

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.