On Mon, Nov 20, 2017 at 10:36 AM, Farley, Peter x23353 < peter.far...@broadridge.com> wrote:
> That is interesting John. No such field in my V2.1 MODGEN library member > IHAECVT. What offset it that at in your copy? > Apparently came in with 2.2 https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.2.0/com.ibm.zos.v2r2.iead100/iead100662.htm 268 (10C) ADDRESS 4 ECVTDUCU "V(IEAVDUCU)" - DUCT update - A value of 0 in ECVTDUCU means that the function is not available - Caller must be AMODE 31 or 64, key 0, supervisor state - Task mode - Primary ASC mode - Any P, Any S, Any H - To invoke the service: - Set GR 1 to 1 to indicate to update the TRAP Control Block Address - Set GR 0 to the address of the doubleword aligned TRAP Control Block Address (below 2G). Bits 0-31 of 64-bit GR0 are ignored. A non-zero value in bits 32-63 will enable the TRAP function. When enabling, bit 63 is ignored. Bits 61-62 must be 0. Use a value of 0 in bits 32-63 to disable the TRAP function. - Load ECVTDUCU into GR 15. Do not use the LLGT instruction. You do not need to set bits 0-31 of 64-bit GR 15. - If AMODE 64, issue BASSM 14,15 If AMODE 31, issue BASR 14,15 or BASSM 14,15 - Upon return from the service - 31-bit GRs 2-13, high halves 2-14, and ARs 2-14 will be preserved. Other GRs, high halves, and ARs may be used as work registers by the system. - On return R15 contains a return code 0 - success 8 - bad value in register 1 12 - TRAP update request in SRB mode > > One would HOPE such a field would be used by full z/OS support for > actually USING the TRAPx functionality (along with the several > compare-and-trap instructions too). > > Perhaps a "future use" field? > > Peter > > -- I have a theory that it's impossible to prove anything, but I can't prove it. Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
