McKown, John wrote:
Why use J *+2 ? It assembles to "A7F4 0001", which would jump to the "0001" portion of the instruction. Why not just hard code a H'0'? Do you have some fancy debugger which detects this particular sequence by saying something like: "If the abend is a S0C1, and the opcode is x'00' followed by a x'01' and the BEA register points 2 bytes before the abend address, then report a deliberate abend."?
Jumps can be conditional. DC H'0', EX of EX, and all similar techniques are "messy" because you must always branch *around* the code to force the abend. For example:
CLI 0(R1),C'A' Value too low? JNL LABEL1 Branch if not DC H'0' Force logic error" abend LABEL1 DC 0H CLI 0(R1),C'9' Value too high? JNH LABEL2 Branch if not DC H'0' Force logic error" abend LABEL2 DC 0H vs the very simple ... CLI 0(R1),C'A' Value too low? JL *+2 Force logic error" abend CLI 0(R1),C'9' Value too high? JH *+2 Force logic error" abend -- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 [EMAIL PROTECTED] http://www.phoenixsoftware.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
