NetBSD Problem Report #43781
From www@NetBSD.org Thu Aug 19 05:33:05 2010
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Date: Thu, 19 Aug 2010 05:33:05 +0000 (UTC)
From: Dmitry.V.Shkurko@intel.com
Reply-To: Dmitry.V.Shkurko@intel.com
To: gnats-bugs@NetBSD.org
Subject: The value of MXCSR does not always equal to __INITIAL_MXCSR__
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>Number: 43781
>Category: port-i386
>Synopsis: The value of MXCSR does not always equal to __INITIAL_MXCSR__
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: port-i386-maintainer
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Thu Aug 19 05:35:00 +0000 2010
>Originator: Dmitry Shkurko
>Release: NetBSD 5.1_RC2
>Organization:
Intel
>Environment:
System: NetBSD nsticlxb388 5.1_RC2 NetBSD 5.1_RC2 (GENERIC) #0: Fri May 21 04:32:33 UTC 2010 builds@b8.netbsd.org:/home/builds/ab/netbsd-5-
1-RC2/i386/201005210534Z-obj/home/builds/ab/netbsd-5-1-RC2/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
MXCSR_MASK field of the FXSAVE image is not initialized properly (en_rsvd3 field, file sys/arch/i386/include/npx.h)
Please see "11.6.6 Guidelines for Writing to the MXCSR Register" in "Intel 64 and IA-32 Architectures Software Developers Manual Volume 1"
>How-To-Repeat:
I was able to modify MXCSR in one process under GDB and obtain modified MXCSR in another process.
Sorry for possibly duplicated report.
>Fix:
Please refer to the documentation for a description of correct MASK initialization
(Contact us)
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