>> "So besides influencing the Address Space Number (ASN), it is my >> understanding that SASN=NEW also temporarily inhibits secondary addressing"
That is not what happens. "SASN=NEW" on ETDEF just dictates that control register 3 is going to contain the ASID for the ETDEF owning address space when the PC-ss get control (SASN=OLD means that CR3 contains the caller ASID). When you execute the MVCP instruction, the system will use the contents of CR3 (for SASN) and CR4 (PASN) for address resolution. It is true to say that "SASN=NEW prevents the PC-ss routine from accessing the caller address space using methods that rely on SASN, for example MVCP/S and the ALET value of 1 in AR mode" If you can guarantee that the caller data is in the HASN, you could use AR mode and the special ALET value of 2 to access data. It is worth noting that *most* PC-ss routines have SASN=OLD as transfer of data between caller and service provider is standard practice and easy in this setup. In my opinion, using SASN=NEW is relatively niche and, if used, there is a very good reason why the developer coded it. -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of esst...@juno.com Sent: Tuesday, January 8, 2019 8:56 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: SASN=NEW on ETDEF macro Rob Scott wrote Same situation but SASN=NEW, then the MVCP will attempt to copy data from address X in the *server* address space to some address Y in the server ASID. So besides influencing the Address Space Number (ASN), it is my understanding that SASN=NEWalso temporarily inhibits secondary addressing..Do I understand this correctly ? ---------- Original Message ---------- From: Rob Scott <rsc...@rocketsoftware.com> To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: SASN=NEW on ETDEF macro Date: Tue, 8 Jan 2019 18:07:19 +0000 Please re-read both my and Peter Relson's reply. If your caller has data in his space at address X and the existing PC-ss with SASN=OLD uses MVCP to copy the data from SASN address X to some address Y in the server ASID - then all is good. Same situation but SASN=NEW, then the MVCP will attempt to copy data from address X in the *server* address space to some address Y in the server ASID. If there is data at address X in the server space, then some presumably unwanted data ends up at address Y, otherwise you are going to abend 0C4. -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of esst...@juno.com Sent: Tuesday, January 8, 2019 4:28 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: SASN=NEW on ETDEF macro Rob POPS never states that the two address spaces must be different for MVCS and MVCP.I can and have issued MVCP in a NON Cross Memory ProgramMeaning I can issue an MVCP when HASN=PASN=.SASN. I have don't it with a standard Key 8 program, and the source field was copied to the target location. ---------- Original Message ---------- From: "esst...@juno.com" <esst...@juno.com> To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: SASN=NEW on ETDEF macro Date: Tue, 8 Jan 2019 16:12:53 GMT Rob POPS never states that the two address spaces must be different for MVCS and MVCP.I can and have issued MVCP in a NON Cross Memory Program Meaning I can issue an MVCP when HASN=PASN=.SASN, --------- Original Message ---------- From: Rob Scott <rsc...@rocketsoftware.com> To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: SASN=NEW on ETDEF macro Date: Tue, 8 Jan 2019 13:26:43 +0000 This is not an anomaly - the system is behaving exactly how you told it to via the ETDEF. Let's assume that prior to your original PC-ss call (SASN=OLD), you were in normal HASN=PASN=SASN mode and your ASID is X'00C0' and the PC-ss owner is ASID '00F0' After the PC-ss, you will have : HASN = 00C0, PASN = 00F0 and SASN = 00C0 The MVCP will move data from the client address space (00C0) to the server address space (00F0) as expected. When you code SASN=NEW and issue the PC-ss, you will have : HASN= 00C0, PASN=00F0 and SASN = 00F0 The MVCP will then attempt to move data from the server address space (00F0) to the server address space (00F0) The fact that you did not abend is probably just luck. -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of esst...@juno.com Sent: Monday, January 7, 2019 10:01 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: SASN=NEW on ETDEF macro .I'm experiencing an issue which I don't understand. . I have a small Stacking Space Switching PC Service Routine, its Entry Table Definition (ETDEF) has SASN=Old Specified. . It is my understanding - SASN specifies whether the stacking PC routine will execute with SASN equal to the caller's PASN (SASN=OLD) . PC Service Routine - issues a STORAGE OBTAIN for some reentrant storage - issues a MVCP (Move Characters To Primary) to copy a parameter list into the reentrant storage - copies a small amount of data (under 100 bytes) back to the secondary address spaces using an MVCS instruction with an address provided in the parameter list. . The parameter list also contains an eye-catcher which is verified after completion of the MVCP (Move Characters To Primary) instruction. The are no Access Registers used. . This routine works well as I can see the data returned to the caller/requester in the secondary address space. . I agree - Not much of a PC Service Routine, and Access List may be better But using AR registers is Not the ISSUE ! . . When I modify the Entry Table Definition to use SASN=NEW for this Stacking Space Switching PC Service routine, the MVCP instruction does Not produce the same results. Meaning NO data is copied from the secondary address Space to the Primary Address Space. the condition Code is 0. . After execution of the MVCP instruction the condition code is 0 and the structure in the reentrant storage that should occupy the remote parameter list does not contain the eye-catcher. The Return address for the data is zero. . According to Principal Of Operations, There is no condition code for this scenario, .MVCP and MVCS only provide condition code 0 or 3. . This anomoly only occurs when I change the ETD Def to use SASN=NEW. . Is this Normal Behavior ?, as I have not found this documented clearly in Extended Addressability. The Program does not change, only the specification for SASN in the Entry Table Description..Do I need to specify another parameter in the ETDEF macro ? . .Sorry I can't post code - contractual Paul D'Angelo... . ---------------------------------------------------------------------- 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 â– 77 Fourth Avenue, Waltham MA 02451 â– Main Office Toll Free Number: +1 855.577.4323 Contact Customer Support: https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmy.rocketsoftware.com%2FRocketCommunity%2FRCEmailSupport&data=02%7C01%7CRScott%40ROCKETSOFTWARE.COM%7C3206a784ebf54d43e35a08d675ac0338%7C79544c1eed224879a082b67a9a672aae%7C0%7C0%7C636825779004933509&sdata=fv%2BdXrJorjkGHCX9KHMN4r7oabQjR7u7mQvWSZmT0Ls%3D&reserved=0 Unsubscribe from Marketing Messages/Manage Your Subscription Preferences - https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.rocketsoftware.com%2Fmanage-your-email-preferences&data=02%7C01%7CRScott%40ROCKETSOFTWARE.COM%7C3206a784ebf54d43e35a08d675ac0338%7C79544c1eed224879a082b67a9a672aae%7C0%7C0%7C636825779004933509&sdata=KCYlPu%2Bt9yi6B5DcnM1ipRsepYnKv1mCxmRcH2zWPQA%3D&reserved=0 Privacy Policy - https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.rocketsoftware.com%2Fcompany%2Flegal%2Fprivacy-policy&data=02%7C01%7CRScott%40ROCKETSOFTWARE.COM%7C3206a784ebf54d43e35a08d675ac0338%7C79544c1eed224879a082b67a9a672aae%7C0%7C0%7C636825779004933509&sdata=cl1Cl%2BieAOiVnxXtw3LVmpXRSywIBdaMb0t0JCDQdPU%3D&reserved=0 ================================ This communication and any attachments may contain confidential information of Rocket Software, Inc. 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