Article View: comp.sys.ibm.pc
Article #1443580287 FLD ST(0) - causes my AT to hang!
From: Jerry Lotto
Date: Fri, 21 Nov 1986 16:10
Date: Fri, 21 Nov 1986 16:10
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1414 bytes
A recent posting in net.sources (gnuplot), compiled with Microsofts C compiler v 4.0 causes my machine to hang up. Only a hard reset brings it back. I traced the problem to a single machine instruction! The problem arises in the _log10 routine. In the debugger(s), I was able to trace the problem down to the following. There are three items on the stack, and we hit an FLD ST(0). This is supposed to duplicate the top item on the stack. On my machine, it operates similarly to a HALT. The 80287 appears to be well before the instruction. Stepping to it, manually setting up the 80287, etc. all give the same results. Other 80287 instructions work just fine. I have yet to try this on another box. I assume everything will work out OK. Does anyone know what could be going on here? Thanks in advance for any light that can be shed on this problem.
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!brl-adm!rutgers!husc6!wjh12!lotto From: lotto@wjh12.UUCP (Jerry Lotto) Newsgroups: comp.sys.ibm.pc,comp.sources.d,comp.sys.intel Subject: 80287 FLD ST(0) - causes my AT to hang! Message-ID: <35@wjh12.UUCP> Date: Fri, 21-Nov-86 11:10:56 EST Article-I.D.: wjh12.35 Posted: Fri Nov 21 11:10:56 1986 Date-Received: Fri, 21-Nov-86 20:21:16 EST Reply-To: lotto@wjh12.UUCP (Jerry Lotto) Distribution: net Organization: Harvard Univ. Chem. Dept. Lines: 17