Write an assembly language program that pushes $1$ and $2$ onto the stack and then calls a subroutine. The

subroutine should pop the two numbers off the stack, add them, push their sum onto the stack, and then

return to the caller. The caller should pop the sum off the stack and display it$.$ In the source code, the

subroutine should precede the main routine.

Example output:

$3$