I did not understood the stack part. Lets say the slot value is 2, instruction for this would be to move the value located at %rsp-24, into the %rax register.

I did not understood the stack part. Lets say the slot value is 2, instruction for this would be to move the value located at %rsp-24, into the %rax register. So your instruction becomes mov -24(%rsp), %rax Correct?