The recent discussion about the ability (or not) of setting R14 values in dbx at a break point while debugging brought me back to an old and (for me) somewhat sore subject.
The z/Architecture hardware designers graced us with TRAP and TRAP4 and then with compare-and-trap instructions in the hardware. z/OS has yet to provide ordinary application-mode programmers (or for that matter compiler and debugger writers) with the tools to use these hardware features. Because updates to the DUCT are needed to properly utilize the TRAP features, only supervisor-state code (and therefore only APF-authorized code) can use these facilities in current z/OS versions, leaving ordinary application programmers with no way to use any of these hardware features.. When will z/OS provide application programmers (and others) the tools to utilize TRAP and friends? Inquiring minds would love to know. Peter This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
