I would be concerned in the fact that cross-memory POST is only deemed safe in certain circumstances.
I believe that normal cross-memory POST does not validate the ECB-owning address space STOKEN or TCB token. IBM do offer IEAMSXMP which is a safe cross-memory POST protocol if pause/release or PC-ss cannot be used. -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Joseph Reichman Sent: Wednesday, September 26, 2018 2:31 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: ECB in XMEM Post Rob This is just a question is your comment based on the fact the ECB might be in pageable non/fixed storage and has potential for s0c4 Thanks > On Sep 26, 2018, at 9:23 AM, Rob Scott <rsc...@rocketsoftware.com> wrote: > > Both Pause/Release and PC-ss are supported in SRB mode. > > The fact that you are in recovery code (and possibly unsure of the status of > both ECB-owner and client) makes me believe that cross-memory POST is even > more undesirable. > > Not saying that it cannot be done with cross-memory POST, but Pause/Release > offers more environmental validation prior to execution and encapsulating a > PC-ss "POST" function isolates the recovery code from ECB-owner architecture > and may allow recovery code to run problem state. > > As ever in the case of things like this, it is never what you *intend* to do > that causes the problem...... > > -----Original Message----- > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On > Behalf Of Joseph Reichman > Sent: Wednesday, September 26, 2018 1:23 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: ECB in XMEM Post > > You are right as it kills all registers besides 9 If memory serves me > right I think the for the system or PC call > > I know you are going to scream at me but the reason I choose the post > is because I’m posting This from a recovery routine as I don’t know > whether it’s TCB mode or SRB I’m using the system call I.E pc I am > passing the SDWA storage area back in the 3 byte 24 bit comp code area > The 3 byte comp code makes this convenient for me > > >> On Sep 26, 2018, at 8:11 AM, Rob Scott <rsc...@rocketsoftware.com> wrote: >> >> Please be aware that cross-memory POSTs are not ideal and if possible I >> would consider a redesign of your code to use other methods - for example : >> >> (1) Pause/Release >> (2) PC-ss service into ECB-owner ASID to issue POST on caller behalf >> >> Just my 2c. >> >> Rob Scott >> Rocket Software >> >> -----Original Message----- >> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On >> Behalf Of Joseph Reichman >> Sent: Wednesday, September 26, 2018 1:01 PM >> To: IBM-MAIN@LISTSERV.UA.EDU >> Subject: Re: ECB in XMEM Post >> >> Sorry I misunderstood >> So if Address Space A would like to post Address B the ECB must be >> addressable to to B as that is the Target the ASCB is that of the >> target Address space B the ECB can be B private area in A all I need >> is the address of the ECB even in private and ASCB of B >> >> Thanks >> >> >> On Sep 26, 2018, at 7:41 AM, Peter Relson <rel...@us.ibm.com> wrote: >> >>>> This is just another way of saying that for XMEM the ECB is in CSA >>>> right >>> ? >>> No, not right. >>> >>> What within the wording "must be addressable from the address space >>> identified by the ASCB parameter" makes you say that? Storage >>> addressable from an address space includes common storage (whether >>> CSA or SQA) and private storage of the address space. The ECB can be >>> in any of those areas. >>> >>> Peter Relson >>> z/OS Core Technology Design >>> >>> >>> -------------------------------------------------------------------- >>> -- For IBM-MAIN subscribe / signoff / archive access instructions, >>> send email to lists...@listserv.ua.edu with the message: INFO >>> IBM-MAIN >> >> --------------------------------------------------------------------- >> - For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to lists...@listserv.ua.edu with the message: INFO >> IBM-MAIN ================================ Rocket Software, Inc. and >> subsidiaries ■ 77 Fourth Avenue, Waltham MA 02451 ■ Main Office Toll >> Free Number: +1 855.577.4323 Contact Customer Support: >> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmy.r >> ocketsoftware.com%2FRocketCommunity%2FRCEmailSupport&data=02%7C01 >> %7CRScott%40ROCKETSOFTWARE.COM%7Cd997bf72252b48399ec008d623b4583b%7C7 >> 9544c1eed224879a082b67a9a672aae%7C0%7C0%7C636735654825882842&sdat >> a=FCzgvDLPFFnT99MDixYUBiA4e1Gnz39JBPLIeRNLApE%3D&reserved=0 >> Unsubscribe from Marketing Messages/Manage Your Subscription >> Preferences - >> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r >> ocketsoftware.com%2Fmanage-your-email-preferences&data=02%7C01%7C >> RScott%40ROCKETSOFTWARE.COM%7Cd997bf72252b48399ec008d623b4583b%7C7954 >> 4c1eed224879a082b67a9a672aae%7C0%7C0%7C636735654825882842&sdata=c >> BXxvzlrU3dvgZwkYz7B3LWOz7HGGwKFiTt7uPYlsZ4%3D&reserved=0 >> Privacy Policy - >> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r >> ocketsoftware.com%2Fcompany%2Flegal%2Fprivacy-policy&data=02%7C01 >> %7CRScott%40ROCKETSOFTWARE.COM%7Cd997bf72252b48399ec008d623b4583b%7C7 >> 9544c1eed224879a082b67a9a672aae%7C0%7C0%7C636735654825882842&sdat >> a=XO3065WD6tP9ATks5b2bWQFD6%2FaYxgp8y%2FY9Zw7c3w8%3D&reserved=0 >> ================================ >> >> This communication and any attachments may contain confidential information >> of Rocket Software, Inc. 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