From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Thompson, Steve Sent: Wednesday, March 25, 2009 6:33 PM To: IBM-MAIN@bama.ua.edu Subject: Re: SVC 50 (0A32)
>I believe its unintended use is for putting entries into the system trace. >So, depending on what you want to note, you stick values into R15-R1 and then invoke SVC 50. >Regards, Steve Thompson So what does SVC FLIH do when you execute SVC 50 while disabled holding a lock and in SRB mode? I never tried that, but it doesn't sound doable. I added entries to system trace once by loading almost all 16 registers with useful stuff and then doing the TRACE instruction. I would bet the 1971 FE handbook had it right; i.e., a NOP. But why you would need an SVC to do that is beyond me. Bill Fairchild ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
