675
Instructions
Performing
Read-Modify-Write
May
Alter
Architectural
State
Before
#
PF
Description
An
instruction
performing
a
read-modify-write
operation
may
be
presented
with
a
page
fault
(#
PF
)
after
modifying
architectural
state
.
Potential
Effect
on
System
The
processor
may
present
a
#
PF
exception
after
some
of
the
instruction
effects
have
been
applied
to
the
processor
state
.
No
system
effect
is
observed
unless
the
operating
system's
page
fault
handler
has
some
dependency
on
this
interim
processor
state
,
which
is
not
the
case
in
any
known
operating
system
software
.
The
interim
state
does
not
impact
program
behavior
if
the
operating
system
resolves
the
#
PF
and
resumes
the
instruction
.
However
,
this
interim
state
may
be
observed
by
a
debugger
or
if
the
operating
system
changes
the
#
PF
to
a
program
error
(
for
example
,
a
segmentation
fault
).
Suggested
Workaround
None
recommended
.
Fix
Planned
Yes
48063
Rev
. 3.18
October
2012
Revision
Guide
for
AMD
Family
15
h
Models
00
h-
0
Fh
Processors
Product
Errata
61