On 7/21/2016 10:07 AM, Elardus Engelbrecht wrote:
Ed Jaffe wrote:
They probably don't want to call E15/E35 exits in SRB mode, ...
Excellent catch! Running an exit while sitting on zIIP is an interesting
scenario. Hmmmm, very very interesting, what will happens when you try out that
little trick?
And if you're sitting in a micro code while running some things in zIIP, what
will happens? Exit the zIIP and running from CPU while using those micro code
and jump back to zIIP?
Just to be clear, zIIP is not a different kind of hardware. It's the
same architecture as a CP. When you're dispatched on a zIIP, you're
executing exactly the same instructions you would execute on a CP.
You're not running "micro code" or anything like that.
SORT probably doesn't want to call E15/E35 is SRB mode because the
environment is too restrictive for a typical E15/E35 exit. For example:
a) the call will be in supervisor state -- that could also be an
integrity exposure
b) the code is not able to issue SVCs or perform "normal" I/O activities
(GET, PUT, EXCP, etc.)
--
Edward E Jaffe
Phoenix Software International, Inc
831 Parkview Drive North
El Segundo, CA 90245
http://www.phoenixsoftware.com/
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