swap registers in mips code example

Example: swap address in mips

lui $t0, 0x8008     ;$t0 = 0x80080000
lw  $t1 0($t0)      ;load (0x80080000) in $t1
lw  $t2 4($t0)      ;load (0x80080004) in $t2
sw  $t1 4($t0)      ;store $t1 in 0x80080004
sw  $t2 0($t0)      ;store $t2 in 0x80080000