On 1/27/2022 8:56 AM, Tony Thigpen wrote:
Ed,
By the 'rules' express in this thread, if the caller places one of the
literals at x'04', he then *must* place the back-pointer at offset
x'80'. Is that not what you and others have been saying?
Ugh. I quickly "ripped off" a silly (and stupid) response to what seemed
like a silly question. 😅
A better response is that empirical evidence demonstrates +4 in the
provided save area does not necessarily indicate its size.
Case in point, upon entry to a batch program invoked via EXEC PGM= I see
the following (courtesy of z/XDC):
TCB#4 RB#1 (AUTH) -----------XDC-CDF ISPF INTERFACE ------A.S. CALLSAVE-
XDC ===>
_Â 00000000_00038008 8f (A.S.CALLSAVE) --- PRIVATE+36008, @R13+0
_   +36008 8f                   00000000 00000000 *........*
_   +36010 8f 00000000 00000000 00000000 00000000 *................*
_   +36020 8f 00000000 00000000 00000000 00000000 *................*
_   +36030 8f 00000000 00000000 00000000 00000000 *................*
_   +36040 8f 00000000 00000000 00000000 00000000 *................*
_   +36050 8f 00000000 00000000 00000000 00000000 *................*
_   +36060 8f 00000000 00000000 00000000 00000000 *................*
_   +36070 8f 00000000 00000000 00000000 00000000 *................*
_   +36080 8f 00000000 00000000 00000000 00000000 *................*
_   +36090 8f 00000000 00000000 00000000 00000000 *................*
_   +360A0 8f 4F4F4F4F 4F4F4F4F 4F4F4F4F 4F4F4F4F *||||||||||||||||*
_   +360B0 8f 4F4F4F4F 4F4F4F4F 4F4F4F4F 4F4F4F4F *||||||||||||||||*
Clearly, we have been passed a 144-byte save area per the documentation.
(Actually, we see one additional doubleword of zeros, but that is not
part of the documented interface and is irrelevant.)
The value at +4 is zeros. How does that tell me I have a 144 byte save area?
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
https://www.phoenixsoftware.com/
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