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[Qemu-devel] [Bug 996798] [NEW] Incorrect order of task switching
From: |
Юрий Попов |
Subject: |
[Qemu-devel] [Bug 996798] [NEW] Incorrect order of task switching |
Date: |
Tue, 08 May 2012 21:55:26 -0000 |
Public bug reported:
In Intel specifications
(http://download.intel.com/design/processor/manuals/253668.pdf 7.3), we
can see:
8. Saves the state of the current (old) task in the current task’s
TSS.
…
11. Loads the task register with the segment selector and descriptor
for the new task's TSS.
But, in QEMU code
(https://raw.github.com/qemu/QEMU/v1.0/target-i386/op_helper.c :375),
the order is reversed: TSS registers & segments loads BEFORE save old
task state.
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/996798
Title:
Incorrect order of task switching
Status in QEMU:
New
Bug description:
In Intel specifications
(http://download.intel.com/design/processor/manuals/253668.pdf 7.3),
we can see:
8. Saves the state of the current (old) task in the current task’s
TSS.
…
11. Loads the task register with the segment selector and
descriptor for the new task's TSS.
But, in QEMU code
(https://raw.github.com/qemu/QEMU/v1.0/target-i386/op_helper.c :375),
the order is reversed: TSS registers & segments loads BEFORE save old
task state.
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