Defining and Calling Procedures

In assembly, a procedure (often called a function or subroutine) is a block of code designed to perform a specific task. They help organize your program and avoid repeating code.

Think of them like functions in high-level languages like C++ or Python. They allow you to break down complex problems into smaller, manageable parts, making your code modular and easier to read.

To execute a procedure, we use the CALL instruction. When CALL is executed, two important things happen:

• The address of the instruction immediately after CALL is pushed onto the stack. This is known as the return address.
• The CPU then jumps to the starting address of the procedure you specified.

This mechanism ensures that the program knows exactly where to resume execution once the procedure has completed its work.