David,
You say that the subroutine linkage is different. Can you tell me
where the linkage is documented? I'd like to understand how XPLINK
linkage works for incorporation into some of my routines.
Thanks,
Chuck
Charles (Chuck) Hardee
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-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]]
On Behalf Of David Crayford
Sent: Tuesday, August 19, 2014 11:19 PM
To: [email protected]
Subject: Re: ASM calling C or C++ subroutines
That looks good to me. Make sure that you setup the parameter lists
correctly. C/C++ are call by value languages. The code path for calling
a routine is just a few instructions. It loads LE control blocks into
registers and then uses BSM to invoke the routine.
You certainly will need LE if your calling C/C++ code other than
Metal/C.
You only need XPLINK if your C/C++ programs are compiled XPLINK. I
always use XPLINK because it almost always generates faster code but the
subroutine linkage is very different to OS linkage and you have to take
that into consideration when debugging.
On 20/08/2014 4:28 AM, Donald Likens wrote:
I have been looking at the LE documentation now for days and still
not sure what I need to do to have my Assembler program call C or
C++ programs. I need this interface to be very efficient because I
will be calling these subroutines maybe more than a 1,000,000 times
a day. What I have come up with is to use CEEPIPI to build the
environment.
LA R5,PPTBL GET ADDRESS OF PIPI TABLE
ST R5,@CEXPTBL CEEXPTBL-ADDR -> PIPI TABLE
L R15,PPRTNPTR GET ADDRESS OF CEEPIPI ROUTINE
* INVOKE CEEPIPI ROUTINE
CALL (15),(INITSUB,@CEXPTBL,@SRVRTNS,RUNTMOPT,TOKEN)
I will have three subroutines so I think I need to put each one of
these routines in the preinit table.
Now I think I need to use CEEPIPI again when I want to call each
subroutine.
ST R11,PARM
L R15,PPRTNPTR GET ADDRESS OF CEEPIPI ROUTINE
CALL
(15),(CALLSUB,PTBINDEX,TOKEN,PARM, X
SUBRETC,SUBRSNC,SUBFBC) INVOKE CEEPIPI ROUTINE
Note:
Note: The C routines have not been created yet, so I can't try these
things out.
Questions:
1) Do I have it correct?
2) Do I even need LE?
3) The book talks about XPLINK. I don't quite understand it. Is this
something I should explore more?
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