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Language Assembler (MIPS)
| Date: | 05/13/05 |
| Author: | Dean Liu |
| URL: | n/a |
| Comments: | 7 |
| Info: | n/a |
| Score: |  (3.52 in 266 votes) |
####################################################
#Author: Dean Liu
#Contact: deanliu@cs.ucsb.edu
# deanliu@umail.ucsb.edu
#Date: May 1st,2005
#Description: MIPS Assembly version of
# 99 bottles
# of beer on the wall
####################################################
.data #data portion
strng: .asciiz " bottles of beer on the wall, "
strng2: .asciiz " bottles of beer "
strng3: .asciiz "\ntake one down and pass it around, "
strng4: .asciiz " bottle of beer on the wall "
strng5: .asciiz " bottle of beer "
strng6: .asciiz " bottles of beer on the wall.\n "
one: .word 1
.text #code section
main: #main
li $a2, 1 #
li $a3, 99 #start with 99
loop: jal PRNTB #prnt bottle count
la $a0, strng #print strng
li $v0, 4 #
syscall #
jal PRNTB #
la $a0, strng2 #print strng2
li $v0, 4 #
syscall #
la $a0, strng3 #print strng3
li $v0, 4 #
syscall #
sub $a3, $a3, 1 #subtract one
jal PRNTB #
la $a0, strng6 #print strng6
li $v0, 4 #
syscall #
bne $a3, $a2, skip #handles one
#bottle on wall
jal ONEBOT #
skip: bnez $a3, loop #Loop if not equal
#to 0
li $v0, 10 #exit
syscall #
####################################################
# Routine: PRINTB($a0)
# Description: Prints out current bottle count
####################################################
PRNTB: move $a0, $a3 #prnt bottle count
li $v0, 1 #
syscall #
jr $ra #return from method
####################################################
# Routine: ONEBOT($a0)
# Description: Handles one bottle count.
####################################################
ONEBOT: addi $sp,$sp,-4 #allocate
sw $ra,0($sp) #store rtrn
#address
jal PRNTB #
la $a0, strng4 #print strng4
li $v0, 4 #
syscall #
jal PRNTB #
la $a0, strng5 #print strng5
li $v0, 4 #
syscall #
la $a0, strng3 #print strng3
li $v0, 4 #
syscall #
sub $a3, $a3, 1 #subtract one
jal PRNTB #
la $a0, strng6 #print strng6
li $v0, 4 #
syscall #
lw $ra,0($sp) #load address
addi $sp,$sp,4 #pop
jr $ra #rtrn from method
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Comments
li $v0, 1 #
syscall #
jr $ra #return from method
This is entirely correct. $ra is not a persistant register. so when you do a
syscall, your $ra can get overwritten by it.
You can either use another register or push it in the stack as below
PRNTB: addi $sp, $sp, -4
sw $ra, 4($sp)
move $a0, $a3 #prnt bottle count
li $v0, 1 #
syscall #
lw $ra, 4($sp)
add $sp, $sp, 4
jr $ra #return from method
E-mail address has expired - deanliu@gmail.com if anyone needs to reach me! Good luck in CS30!
Go Gauchos!