Please add reasons why each line is written if you can. I would like to understa
ID: 3604593 • Letter: P
Question
Please add reasons why each line is written if you can. I would like to understand this and be able to do it on my own. Thank you.
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. WE HAVE TO USE RUNTIME STACK BECAUSE THAT WAS THE LESSON and NO PSUEDO-INSTRUCTIONS.
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($a0) which holds the address of where the list of numbers is to be stored. Getdata calls thefunction printstr to print the prompt. Getdata is complete and should not be changed.
Printstr: This function is to print a string. There is one parameter ($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.
Specifics:
-Use only the instructions covered to date.
-Do not use pseudo-instructions. See the information under MARS for preventing the use of pseudo-instructions.
-Make sure that your print function calls the printstr function correctly and that the stack is used correctly.
Documentation:
-Comment every instruction.
# 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
jr $ra
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
jr $ra
Explanation / Answer
#here is the code for printstr and print
# in print loop the commas are made to start after 2nd number i.e.,
# for eg if it is in c program print 1st number and then start for loop for(i=2;i<=9;i++)
printstr:
la $a0, prompt # address of prompt goes in
li $v0, 4 # service code for print string
syscall
jr $ra #return from call by putting value to ra
print:
addi $t2, $t2, 10
addi $t0, $t0,1 #increment by 1 before entering into loop
ori $v0, $0, 4 #print 1st value ,as loop start from 2nd value
syscall
jal loop #jump to loop
loop: beq $t0, $t2, end
lui $t3, 0x1001
or $a0, $0, $t3
ori $v0, $0, 1
syscall
addi $t3, $t3, 4
ori $a0, $a0, 0x0038
ori $v0, $0, 4 #command to print string at $a0
syscall
addi $t0, $t0, 1
j top
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