Date: Wed, 1 May 2013 18:06:54 +0000 (UTC) From: Dimitry Andric <dim@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r250151 - in stable: 6/sys/boot/i386/btx/btx 6/sys/boot/pc98/btx/btx 7/sys/boot/i386/btx/btx 7/sys/boot/pc98/btx/btx 8/sys/boot/i386/btx/btx 8/sys/boot/pc98/btx/btx 9/sys/boot/i386/btx/... Message-ID: <201305011806.r41I6sGs049910@svn.freebsd.org>
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Author: dim Date: Wed May 1 18:06:53 2013 New Revision: 250151 URL: http://svnweb.freebsd.org/changeset/base/250151 Log: MFC r249846: When rebooting (exiting) from the BTX loader, make sure to restore the GDT from the correct segment, otherwise a triple fault would be caused. In some virtual environments (VMware, VirtualBox, etc) this could lead to a unhandled error or hang in the guest emulation software. Thanks to avg and jhb for a few hints in the right direction. Noticed by: Jeremy Chadwick <jdc@koitsu.org> (and many others) Modified: stable/9/sys/boot/i386/btx/btx/btx.S stable/9/sys/boot/pc98/btx/btx/btx.S Directory Properties: stable/9/sys/ (props changed) stable/9/sys/boot/ (props changed) Changes in other areas also in this revision: Modified: stable/6/sys/boot/i386/btx/btx/btx.S stable/6/sys/boot/pc98/btx/btx/btx.S stable/7/sys/boot/i386/btx/btx/btx.S stable/7/sys/boot/pc98/btx/btx/btx.S stable/8/sys/boot/i386/btx/btx/btx.S stable/8/sys/boot/pc98/btx/btx/btx.S Directory Properties: stable/6/sys/ (props changed) stable/7/sys/ (props changed) stable/8/sys/ (props changed) stable/8/sys/boot/ (props changed) Modified: stable/9/sys/boot/i386/btx/btx/btx.S ============================================================================== --- stable/9/sys/boot/i386/btx/btx/btx.S Wed May 1 17:59:41 2013 (r250150) +++ stable/9/sys/boot/i386/btx/btx/btx.S Wed May 1 18:06:53 2013 (r250151) @@ -248,7 +248,7 @@ exit: cli # Disable interrupts /* * Restore the GDT in case we caught a kernel trap. */ - lgdt gdtdesc # Set GDT + lgdt %cs:gdtdesc # Set GDT /* * To 16 bits. */ Modified: stable/9/sys/boot/pc98/btx/btx/btx.S ============================================================================== --- stable/9/sys/boot/pc98/btx/btx/btx.S Wed May 1 17:59:41 2013 (r250150) +++ stable/9/sys/boot/pc98/btx/btx/btx.S Wed May 1 18:06:53 2013 (r250151) @@ -248,7 +248,7 @@ exit: cli # Disable interrupts /* * Restore the GDT in case we caught a kernel trap. */ - lgdt gdtdesc # Set GDT + lgdt %cs:gdtdesc # Set GDT /* * To 16 bits. */
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