Reference Guide

Chapter 4 83

Assembler Directives and Pseudo-Operations

.ENTRY and .EXIT Directives

.ENTRY and .EXIT are compiler generated directives that mark the

entry point and return point of the current procedure.

Syntax

.ENTRY

Lines of Code

.EXIT

Discussion

The .ENTRY directive signiﬁes that the next instruction is the beginning

of an entry point for the current procedure. The .EXIT directive signiﬁes

that the next instruction initiates a return from the current procedure.

These directives must be used when .ENTER and .LEAVE are not

present. .ENTRY and .EXIT are optional if the unwind region does not

have a corresponding entry or exit. See the documents under the topic

PA-RISC Architecture at URL: http://www.software.hp.com/STK/.

Example

This example shows a sequence of compiler-generated assembly code.

.PROC

.CALLINFO CALLER

.ENTRY ; proc entry code follows

STW %r2,-20(%sp) ; stack the return pointer

LDO 48(%sp),%sp ; set up user stack pointer

ADDIL L’$THISMODULE$-$global$,%r27 ; point to printf data

.CALL ; set up for printf call

BL printf,2 ; call printf thru RP

LDO R’$THISMODULE$-$global$(%r1),%r26 ; insert argument to

printf L$exit1 ; hide from linker

LDW -68(%sp),%r2 ; get callee RP

BV 0(%r2) ; exit thru RP

.EXIT ; end of exit sequence

LDO -48(%sp),%sp ; delete stack frame

.PROCEND