 |
» |
|
|
|
.ENTRY
and .EXIT are
compiler generated directives that mark the entry point and return
point of the current procedure. Syntax | |
Lines of Code 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
|
|
