Article View: comp.sys.dec
Article #2475Unaligned accesses on a DECstation 3100/Ultrix 4.0
From: James Elliott
Date: Wed, 28 Nov 1990 01:06
Date: Wed, 28 Nov 1990 01:06
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Ultrix 4.0 on a DECstation seems to have a nice feature of fixing up unaligned accesses in executing programs. Rather than sending a SIGBUS, it prints Fixed up unaligned data access for pid 5285 (adacs) at pc 0x41bc0c on stderr (I'd guess), and continues execution. Now, my problem is that I want to get >rid< of these unaligned accesses, because I consider them bugs. So, I'd prefer to get the signal, so I can trap into the debugger (and get lost trying to figure out the code that Twig generated for me, but that's a different problem). How can I do this? I tried providing a different handler for SIGBUS, but it didn't get called; apparently the signal never gets delivered even to that level? Anyone have any ideas? -- Jim Elliott "Like a bridge he'll come between us, not a wall" elliott@veronica.cs.wisc.edu
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arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!att!linac!uwm.edu!cs.utexas.edu!sun-barr!rutgers!uwvax!elliott@veronica.cs.wisc.eduShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!att!linac!uwm.edu!cs.utexas.edu!sun-barr!rutgers!uwvax!elliott@veronica.cs.wisc.edu From: elliott@veronica.cs.wisc.edu (James Elliott) Newsgroups: comp.sys.dec Subject: Unaligned accesses on a DECstation 3100/Ultrix 4.0 Keywords: Disable the alignment fixer? Message-ID: <11824@spool.cs.wisc.edu> Date: 28 Nov 90 01:06:39 GMT Sender: news@spool.cs.wisc.edu Organization: U of Wisconsin CS Dept Lines: 21