vm: add standalone JIT

The old JIT's dependency on Lua and DynASM made it a little harder to integrate
with a larger project. Worse, DynASM has bugs that prevented us from using the
using the exact instruction we needed and forced us to fall back to a longer
instruction sequence (STXB/LDXB/BSWAP).

The main disadvantage is readability since we're now writing machine code
instead of assembly. The new JIT isn't (yet) able to emit short 8-bit jump
4 files changed
tree: f991e0fa6f4eff5978bc109fb4944ab73c715053
  1. bin/
  2. test_framework/
  3. tests/
  4. ubpf/
  5. vm/
  6. .gitmodules
  7. .travis.yml
  9. README.md
  10. requirements.txt


Userspace eBPF VM

Build Status Coverage Status


This project aims to create an Apache-licensed library for executing eBPF programs. The primary implementation of eBPF lives in the Linux kernel, but due to its GPL license it can't be used in many projects.

[Linux documentation for the eBPF instruction set] (https://www.kernel.org/doc/Documentation/networking/filter.txt)

[Instruction set reference] (https://github.com/iovisor/bpf-docs/blob/master/eBPF.md)

This project includes an eBPF assembler, disassembler, interpreter, and JIT compiler for x86-64.


Run make -c vm to build the VM. This produces a static library libubpf.a and a simple executable used by the testsuite.

Compiling C to eBPF

You'll need [Clang 3.7] (http://llvm.org/releases/download.html#3.7.0).

clang-3.7 -O2 -target bpf -c prog.c -o prog.o

You can then pass the contents of prog.o to ubpf_load_elf, or to the stdin of the vm/test binary.


Please fork the project on GitHub and open a pull request. You can run all the tests with nosetests.


Copyright 2015, Big Switch Networks, Inc. Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0>.