5 ms·

How do people find these instructions?

• 1-6 5y ago
  Perhaps someone accidentally left the doors open on the Atom CPU which allowed them to run a disassembler. "In mid-2020, our team managed to extract microcode for modern Atom processors that are based on the Goldmont microarchitecture. It became possible to do this on Atom Goldmont systems-on-chip (SoCs) due to an arbitrary code execution vulnerability in Intel CSME (Intel-SA-00086)."
• x0re4x 5y ago
  Probably using something like that: https://github.com/xoreaxeaxeax/sandsifter https://github.com/xoreaxeaxeax/sandsifter
  • vsareto 5y ago
    yeah, it's cited in the paper: [4] C. Domas. Breaking the x86 ISA.https://www.blackhat.com/docs/us-17/thursday/us-17-Domas-Breaking-The-x86-Instruction-Set-wp.pdf https://www.blackhat.com/docs/us-17/thursday/us-17-Domas-Bre..., Jul. 2017.
  • fart32 5y ago
    Reminded me his cool setup: https://youtu.be/_eSAF_qT_FY?t=1972 https://youtu.be/_eSAF_qT_FY?t=1972
• sabas123 5y ago
  They have been reverse engineering Atom for over half a decade (possibly longer) now.