PROC Assembler Statement

Arguments

name PROC 〚type〛
     ...         ; instructions and comments
     RET
name ENDP

Description

The directives PROC and ENDP are used to define a label for a sequence of machine instructions called a procedure. For the NXP MX Devices and Intel 251 architecture a procedure can have either the type NEAR or FAR, depending on the type with which it is called - LCALL or ACALL (for NEAR); ECALL (for FAR). Unlike C functions, assembler procedures do not provide local scopes for labels. Identifiers must be unique in A251, because the visibility is module wide.

Where:

name	Specifies the name of the procedure.
PROC	Specifies that this is a procedure function.
type	Specifies that the procedure is near or far and must be one of the following: none: The type defaults to NEAR. NEAR: Defines a near procedure; called with LCALL or ACALL. FAR: Defines a far procedure; called with ECALL. You should specify FAR if the procedure is called from a different 64KByte segment.
RET	A procedure ends normally with a RET instruction. The software instruction RET will be converted automatically to an appropriate machine return instruction. For example: RET: Return from a near procedure. ERET: Return from a far procedure.
ENDP	Procedures defined with the PROC statement must be terminated by the ENDP statement, preceded by the procedure name, name.