Note that the cleaning up and reordering in revision 1.19 actually fixed a

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nasty bug.  The comparison to tset for an instruciton with the $0xf prefix
should have jumped down to the next non-prefix instruction test.  Instead,
it jumped down to the next instruction test, which happened to be prefixed
instruction test.  This test assumed that the earlier test had succeeded,
thus in some rare cases, this test would actually succeed, and we would
actually attempt to emulate a RDMSR instruction instead of the instruction
we were supposed to be emulating.  Since %ecx usually did not contain a
valid MSR index at the time of the trap, this usually resulted in a #GP
due to an invalid MSR address and a lovely BTX fault when one tried to boot
the machine.

Noticed by:	unfurl and others

...

This commit is contained in:

John Baldwin 2000-06-29 09:51:53 +00:00

parent 5badeabaca

commit 44bb7ac654

Notes: svn2git 2020-12-20 02:59:44 +00:00

svn path=/head/; revision=62251

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