Unless the target of the branch is in protected storage. That would allow a ghost type attack.
On Sat, 3 May 2025 17:40:48 +0000 Seymour J Metz <[email protected]> wrote: :>To locate the failing instruction, look at both IC and ILC. It all works as documented. :> :>IIC? :> :>-- :>Shmuel (Seymour J.) Metz :>http://mason.gmu.edu/~smetz3 :>??? ?????????? ??? :>?????? ??????????? ???? ?????????? :> :> :> :>________________________________________ :>From: IBM Mainframe Discussion List on behalf of Johnny Luo :>Sent: Friday, May 2, 2025 11:02 PM :>To: [email protected] :>Subject: Two different types of 0cx abend :> :> :>External Message: Use Caution :> :> :>Hi, :> :>When you execute a "br 14" and r14 contains an invalid address, "br 14" :>will be successfully executed (and will be recorded in BEAR) and the :>content of r14 will be loaded into PSW. Then an exception will occur while :>fetching the next instruction. :> :>So in my understanding, an ocx could occur at fetch&decode stage as well :>as the execution stage. In the former the psw points to the failing :>instruction. In the latter the psw point to the next instruction, so IlC :>should be used to get the address of the failing instruction. :> :>Is there something wrong with my above thoughts? :> :>Thanks. :> :>Best Regards, :>Johnny Luo :> :>---------------------------------------------------------------------- :>For IBM-MAIN subscribe / signoff / archive access instructions, :>send email to [email protected] with the message: INFO IBM-MAIN :> :> :> :> :>---------------------------------------------------------------------- :>For IBM-MAIN subscribe / signoff / archive access instructions, :>send email to [email protected] with the message: INFO IBM-MAIN -- Binyamin Dissen <[email protected]> http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
