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From: jdb@mordor.UUCP (John Bruner)
Newsgroups: net.unix
Subject: Re: SIGEMT/SIGIOT
Message-ID: <3244@mordor.UUCP>
Date: Tue, 3-Sep-85 11:34:13 EDT
Article-I.D.: mordor.3244
Posted: Tue Sep  3 11:34:13 1985
Date-Received: Thu, 5-Sep-85 11:05:46 EDT
References: <152@chinet.UUCP> <579@neuro1.UUCP> <842@ncoast.UUCP>
Reply-To: jdb@mordor.UUCP (John Bruner)
Distribution: net
Organization: S-1 Project, LLNL
Lines: 14

EMT traps on the PDP-11 occur when you execute an EMT instruction.
The EMT instruction is the same as the TRAP instruction except that
it uses a different vector.  DEC operating systems use EMT's for
system calls.

If there is no floating-point hardware, executing a floating-point
instruction will cause an *illegal instruction* trap.

The abort() library routine generates SIGIOT (except in Berkeley UNIX,
where it generates an illegal instruction trap).
-- 
  John Bruner (S-1 Project, Lawrence Livermore National Laboratory)
  MILNET: jdb@mordor [jdb@s1-c.ARPA]	(415) 422-0758
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