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| ; |
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| ; 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 |
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| ; without specific prior written permission. |
| ; |
| ; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| ; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| ; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| ; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| |
| ; 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 |
| ; cpu 6/142 |
| ; cpu 6/158 |
| ; cpu 6/165 |
| ; cpu 6/166 |
| ; |
| |
| 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] |