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Need more info on CAA and enclave in LE

 
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Shruthi Raghavan

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Joined: 17 Jan 2007
Posts: 9
Location: India

PostPosted: Fri Jan 19, 2007 10:40 am    Post subject: Need more info on CAA and enclave in LE
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I am working on LE migration project and have some issues. Can anybody please help me with the conepts of Common Anchor Area (CAA) and enclave. I need to know more about
- R13 pointing to CAA
- invoke cobol in more than one enclave

I would appreciate any kind of help.
Thanks in advance.
Shruthi
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UmeySan

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Joined: 22 Aug 2006
Posts: 755
Location: Germany

PostPosted: Fri Jan 19, 2007 3:12 pm    Post subject: Re: Need more info on CAA and enclave wrt to LE migrtn prj
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Hi Shruthi Raghavan !

When calling LE/370-conforming routines, register 12 points to the address of the CAA.

When a routine makes a call, registers 0-15 contain the following values:

o R0 is used by COBOL static call.
o R1 is a pointer to parameter list or zero if no parameter list passed.
o R2-R11 is unreferenced by LE/370.
Caller's values are passed transparently.
o R12 is the pointer to the CAA if entry to an external routine.
o R13 is the pointer to caller's DSA.
o R14 is the return address.
o R15 is the address of the called entry point.


Here you could find a nice description of the CAA:

http://cenmvst.gov.ab.ca/bookmgr-cgi/bookmgr.exe/BOOKS/BOOKREAD.LANGUAGE.CEEM1003.BOOK/1.3.2.7?SHELF=BOOKREAD.PUBLIC.MESSAGE.BKSHELF

More information:
http://publib.boulder.ibm.com/infocenter/pdthelp/v1r1/index.jsp?topic=/com.ibm.entcobol4.doc/igym1apc.htm

Regards, UmeySan
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