The BEA tells where you came from. It means (going back to an earlier comment) you don't need to branch around x'00'. You can freely branch to it. It is so useful I wish it was part of the symptom dump.
...chris. -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Paul Gilmartin Sent: May-12-17 9:57 AM To: [email protected] Subject: Re: Quick error termination of an assembler routine (Was: Performance of Decimal Floating Point Instruction) On 2017-05-12, at 09:56, somitcw wrote: > My favourite was to branch to an odd address. > > S0C1 and S0C7 ABENDs are common, but any S0C6 abend was mine. > If an operator called at 2:00AM, I would know who caused 3 pair of socks. > Unfortunately, IIRC the exception occurs after the branch is taken so the PSW provides no ready indication of the point of error. > Coding so that the assembler didn't flag it was needed but easy. > Something like: > > BNE ERRLABEL-CSECT-1(BASEREG) > I suppose that could be doctored so the PSW points near either the point at which the error was detected or to an error message. I think of: BZ NOERROR (If RC==0.) DC X'00',C'You shouldn'ta done that.' NOERROR DS 0X -- gil
