[Qemu-devel] [Bug 996798] [NEW] Incorrect order of task switching

[Юрий Попов]

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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