Adding two 64 bit numbers in Assembly

Question

So I am learning MIPS using the SPIM simulator and im stuck on this problem.

I want to add two 64 bit numbers which are stored in four 32 bit registers. So I add the

Answer 1

Add $t2 $t3 + $t4 $t5, result in $t0 $t1

addu  $t1, $t3, $t5    # add least significant word
sltu  $t0, $t1, $t5    # set carry-in bit 
addu  $t0, $t0, $t2    # add in first most significant word
addu  $t0, $t0, $t4    # add in second most significant word

For the second part of your question, there is no status register. None at all. Nada.