; Copyright (c) 2015-2017, Intel Corporation

;

; Redistribution and use in source and binary forms, with or without

; modification, are permitted provided that the following conditions are met:

;

;  * Redistributions of source code must retain the above copyright notice,

;    this list of conditions and the following disclaimer.

;  * Redistributions in binary form must reproduce the above copyright notice,

;    this list of conditions and the following disclaimer in the documentation

;    and/or other materials provided with the distribution.

;  * Neither the name of Intel Corporation nor the names of its contributors

;    may be used to endorse or promote products derived from this software

;    without specific prior written permission.

;

; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

; POSSIBILITY OF SUCH DAMAGE.

; SKD007: Intel(R) PT Buffer Overflow May Result in Incorrect Packets.

;

;         Under complex micro-architectural conditions, an Intel PT (Processor

;         Trace) OVF (Overflow) packet may be issued after the first byte of a

;         multi-byte CYC (Cycle Count) packet, instead of any remaining bytes

;         of the CYC.

;

;   cpu 6/78

;   cpu 6/94

;

org 0x1000

bits 64

; @pt p0: psb()

; @pt p1: mode.exec(64bit)

; @pt p2: fup(3: %l0)

l0: nop

; The first CYC has its 2nd byte overwritten by OVF, which appears as

; another CYC packet.  The two CYCs will have payloads of:

;

;   0x3* or 0x2* and

;   0x1e

;

; @pt p3: cyc(0x3e)

; @pt p4: cyc(0x1e)

; @pt p5: pad()

; @pt p6: fup(3: %l1)

l1: nop

; @pt p7: fup(1: %l2)

; @pt p8: tip.pgd(0: %l3)

l2: nop

l3: hlt

; @pt .exp(ptdump)

;%0p0  psb

;%0p1  mode.exec  cs.l

;%0p2  fup        3: %?l0

;%0p3  cyc        3e

;%0p4  cyc        1e

;%0p5  pad

;%0p6  fup        3: %?l1

;%0p7  fup        1: %?l2.2

;%0p8  tip.pgd    0: %?l3.0

; @pt .exp(ptxed)

;[overflow]

;%0l1 # nop

;[disabled]