ENTER/LEAVE

The enter and leave instructions are used in assembly to simplify setting up and tearing down stack frames for procedures. The enter instruction saves the current base pointer (rbp) onto the stack, sets rbp to the current stack pointer (rsp), and allocates a specified amount of stack space for local variables used by the procedure. This creates a structured stack frame that makes accessing parameters and local variables easier. At the end of the procedure, the leave instruction restores the previous stack frame by moving rbp back to rsp and popping the saved base pointer from the stack. Together, enter and leave provide a convenient and standardized way to manage stack space and maintain proper procedure context in assembly programs.