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$s 10) if $si and $$2 are to be saved on the stack which of the following would accomplish the (10Pts) task? A) addi sp, sp, 8 sw $s1, 0($sp) sw $s2, 4($sp) B) addi sp, sp, 8 lw $s1, 8($sp) lw $s2, 4($sp) addi sp, sp, -8 C) sw $s1, 0($sp) sw $s2, 4(Ssp) D) addi sp, sp, -8 lw $s1, 8($sp) lw $s2, 4($sp) 11) What instruction would be used to call a procedure called square? (5Pts) 12) Where does a procedure return to in the main Program after a jr call? (5Pts)
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Answer #1

C) is the answer for question 10. As, to store on the stack, first the stack pointer needs to be decreased. This is because stack grows downwards. Then, the two registers should be stored on the top, which is offset by 0 and then 4 bytes.

11) The final instruction would be "jr square", where square is the label for the procedure. Note that the arguments will need to stored properly before calling it.

12) The procedure returns to the address stored in $ra (called the return address register appropriately). This is stored on the stack when calling a procedure.

Comment in case of any doubts.

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