There is a field in the LE Enclave Control Block called
CEEEDB_R13_PARENT which is a pointer to a DSA containing the registers
of the enclave parent. If you can be bothered. I would just use
IRXINIT("FINDENVB ") to get the environment block as opposed to fiddling
about with control blocks.
On 29/10/22 06:46, Charles Mills wrote:
Thanks.
What is the relevance to my question? (How do I obtain the contents of R0 on
entry to a C program from Rexx?)
Charles
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Seymour J Metz
Sent: Friday, October 28, 2022 3:02 PM
To: [email protected]
Subject: Re: XLC C/C++, __R1 and Register 0
There are three cases
1. address foo bar baz
Pass command bar baz to environment foo
address foo
bar baz
2. call bar baz
Invoke bar with parameter baz; return value optional
3. bar(baz) in an expression
Invoke bar with parameter baz; return value required
The last two cases are essentially the same. In the first case the value of baz
is passed as a single parameter even if it contains spaces or commas, but the
command processor for the environment may parse it into subparameters.
In the second and third cases baz must be a list of expressions, separated by
commas; there are no constrains on the values of those expressions.
z/OS 2.5 TSO/E REXX Reference, SA32-0972-5, contains details in Chapter 12.
TSO/E REXX programming services and Chapter 14. Language processor environments
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