Analyze the following MIPS program: helper : addi $sp,$sp,-4 sw $ra,0($sp) lw $v

Question

Analyze the following MIPS program:

helper :

addi $sp,$sp,-4

sw $ra,0($sp)

lw $v0, 0($ra)

lw$ra, 0($sp)

adi $sp,$sp,4

jr $ra

Mystery:

addi $sp,$sp,-8

sw $ra, 4($sp)

sw $s0,0($sp)

add $v0,$a0,$a1

jal helper

lw $s0, 0($sp)

lw $ra, 4($sp)

addi $sp, $sp, 8

jr $ra

a) What is the behavior of the helper function? Consider what is means in terms of what the value returns

b) What is the mystery equivalent in C? Don't translate it verbatim but find the most concise code in C for what it is really doing in mystery.Don't consider the behavior of helper here and use it directly if needed.

c) What does the mystery program return? Give the answer in hex and explain it

Explanation / Answer

a) helper function is used to add immediately the stack pointer with -4 and it returns 0.

b) mystery is swaping data as like in C.

c) mystery return value of $ra

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