Reference Guide

102 Chapter 4

Assembler Directives and Pseudo-Operations

.PROC and .PROCEND Directives

The .PROC and .PROCEND directives bracket the instructions within a

procedure.

Syntax

.PROC

Lines of Code

.PROCEND

Discussion

The .PROC directive signiﬁes that the next instruction is the ﬁrst

instruction of a procedure. The .PROCEND directive signiﬁes that the

previous instruction was the last instruction of the procedure. Switching

spaces or subspaces within a procedure is not permitted.

Every procedure must contain a .CALLINFO directive and normally

contains an .ENTER and .LEAVE pseudo-operation. The only exception to

the latter rule occurs in procedures that are either compiler-generated or

created by programmers who are writing their own entry and exit code

sequences. In this case, you must use the .ENTRY and .EXIT compiler

directives.

NOTE Because the .ENTER and .LEAVE pseudo-operations guarantee that the

stack unwind process works correctly, you should consistently use these

directives rather than writing your own entry and exit code sequences.