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Haruspex

/həˈrʌspeks/

A religious official in ancient Rome who predicted the future or interpreted the meaning of events by examining the insides of birds or animals that had been sacrificed.

Exploration of x86-64 ISA using speculative execution.

Haruspex is a project attempting to explore and audit the x86-64 instruction set by (ab)using speculative execution and certain low-level performance counters Intel CPUs provide mainly for the identification of undocumented opcodes and deducing the pipeline properties of each instruction. You can find the article explaining the methodology here.

  • /analysis contains the Node.js server responsible for reducing the dataset and serving it as an interactive table, which you can find live at haruspex.can.ac .
  • /kernel contains the code responsible for producing this data, note that it is essentially "pseudo-code" due to some of the dependencies and parts of the toolchain I used to build it I cannot share, but should be pretty easy to translate it to work in your OS.
  • /raw-data contains the raw data from certain processors.

Thanks to

  • @JustasMasiulis for helping with the web components.
  • @H4vC for the name.

License

Haruspex is licensed under the GNU General Public License v3.

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Exploration of x86-64 ISA using speculative execution.

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