assembly language what does this program do? don\'t show the output, explain wha
ID: 3751397 • Letter: A
Question
assembly language
what does this program do? don't show the output, explain what the program is about
.data
limit: .word 50
space: .asciiz " "
newline: .asciiz " "
tab_space: .asciiz " "
msg_01: .asciiz "A Sample MIPS code "
msg_02: .asciiz "The program ... "
msg_03: .asciiz " End of program ! "
.text
.globl main
main: la $a0, msg_01
li $v0, 4
syscall
la $a0, msg_02
li $v0, 4
syscall
lw $a0, limit
la $a1, space
loop: beq $0, $a0, exit
addi $a0, $a0, -1
li $v0, 1
syscall
move $t0, $a0
move $a0, $a1
li $v0, 4
syscall
move $a0, $t0
j loop
exit: la $a0, msg_03
li $v0, 4
syscall
li $v0, 10
syscall
Explanation / Answer
The following table explains the sequence of code. The program first displays 2 lines
A Sample MIPS code
The program...
Then in a loop it iterates throught numbers 49, 48 to .... 0 and then displays the last line
End of program !
Then the program exits
These statements under .data section declare variables.
limit is an int
space is a string " "
newline is a string " "
tab_space is a string " "
msg_01 to msg_03 are some string messages shown in quotes
la $a0, msg_01
li $v0, 4
syscall
la $a0, msg_02
li $v0, 4
syscall
la $a1, space
loop:
beq $0, $a0, exit
addi $a0, $a0, -1
li $v0, 1
syscall
move $t0, $a0
move $a0, $a1
li $v0, 4
syscall
move $a0, $t0
j loop
Now the loop begins.
beq is used to check if $a0 is 0, then loop terminates
Otherwise, 1 is subtracted usind add -1 to $a0
The value in $a0 is displayed using system call 1
Next the value of $a0 is saved in temporary register $t0
Next a space is displayed by using the address in $a1 and system call 4
Next the value from $t0 is restored into $a0 and loop continues
limit: .word 50space: .asciiz " "
newline: .asciiz " "
tab_space: .asciiz " "
msg_01: .asciiz "A Sample MIPS code "
msg_02: .asciiz "The program ... "
msg_03: .asciiz " End of program ! "
These statements under .data section declare variables.
limit is an int
space is a string " "
newline is a string " "
tab_space is a string " "
msg_01 to msg_03 are some string messages shown in quotes
la $a0, msg_01
li $v0, 4
syscall
Displays the string msg_01 using system call 4
la $a0, msg_02
li $v0, 4
syscall
Displays the string msg_02 using system call 4 lw $a0, limit
loads the value of limit into register $a0 i.e $a0 = 50
la $a1, space
initializes $a1 with address of variable spaceloop:
beq $0, $a0, exit
addi $a0, $a0, -1
li $v0, 1
syscall
move $t0, $a0
move $a0, $a1
li $v0, 4
syscall
move $a0, $t0
j loop
Now the loop begins.
beq is used to check if $a0 is 0, then loop terminates
Otherwise, 1 is subtracted usind add -1 to $a0
The value in $a0 is displayed using system call 1
Next the value of $a0 is saved in temporary register $t0
Next a space is displayed by using the address in $a1 and system call 4
Next the value from $t0 is restored into $a0 and loop continues
exit: la $a0, msg_03li $v0, 4
syscall Now the last string message msg_03 is displayed using system call 4 li $v0, 10
syscall program terminates using system call 10
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