Bug fix

.file 1 "arrcopy.c" .globl source .data .align 2 source: .word 3 .word 1 .word 4 .word 1 .word 5 .word 9 .word 0 .rdata .align 2 $LC0: .ascii "%d values copied \000" .text .align 2 .globl main .ent main main: .frame $sp,24,$31 # vars= 0, regs= 1/0, args= 16, extra= 0 .mask 0x80000000,-8 .fmask 0x00000000,0 subu $sp,$sp,24 sw $31,16($sp) jal __main la $9,source lw $2,0($9) move $8,$0 beq $2,$0,$L8 move $7,$0 la $10,dest $L6: addu $8,$8,1 sll $3,$8,2 addu $5,$7,$9 addu $2,$3,$9 addu $6,$7,$10 lw $4,0($2) move $7,$3 lw $3,0($5) #nop sw $3,0($6) bne $4,$0,$L6 $L8: la $4,$LC0 move $5,$8 jal printf lw $31,16($sp) move $2,$0 addu $sp,$sp,24 j $31 .end main

.comm dest,40

(Exercise) Debugging MIPS Debug the loop written in arrcp.s. The program is suppose to copy integers from memory address in $a0 to memory address in $a1, until it reads a zero value. The number of integers copied (up to but not including the zero value) should be returned so stored into $v0. Q1. How many bugs are there? Q2. How do you fix the bug(s)? Q3. What is your strategy to finding the bug(s)? Fix the code so it work in arrcp.s