Compilation Note RET

 DUP (0) stack endscode segment                mov ax,4c00h                int  21h                start:            mov ax,stack                mov ss,ax                mov sp,                                mov ax,0                push AX                mov bx,0                retcode endsend start

Above instruction, let IP point to 0000, the program exits normally.

When you execute push AX, the data in AX is put into buyers, sp=sp-2.

The following 2 steps are performed when the RET instruction is executed:

1: (IP) = ((SS) * + (SP))

2: (sp) = (sp) + 2

The use of assembly directives to denote RET operations is equivalent to:

POP IP

Remove the data from the buyers into the IP.

Compilation Note RET