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From: | sandmann AT clio DOT rice DOT edu (Charles Sandmann) |
Message-Id: | <10303121800.AA20040@clio.rice.edu> |
Subject: | Re: Getting CRx registers |
To: | djgpp-workers AT delorie DOT com |
Date: | Wed, 12 Mar 2003 12:00:15 -0600 (CST) |
In-Reply-To: | <09e801c2e8ac$6685f830$0600000a@broadpark.no> from "Gisle Vanem" at Mar 12, 2003 04:31:06 PM |
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> Is there a safe way to get the value of the Control Registers > (CR0-4) under CPL > 0?. Not today. If there were a good reason I would consider adding something to CWSDPMI to emulate it - but given the large number of DPMI providers out there, I think this is a bad idea. If you need these, why not just run under ring 0? > Under Win-XP "movl %cr4,%eax" seems to be safe (i.e. doesn't crash), > but return value is always 0. So it's useless. > Under plain DOS and CWSDMI it crashes. > I could probably use a SIGILL handler, but try to avoid it. If it never returns useful information under CPL > 0, don't do it?
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