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Implement unwind on success semantics to support bpf_tail_call.

bpf_tail_call has special semantics. If the call returns success, then ubpf needs to store the return value and unwind the stack so to the caller.

Resolves: #87 

Signed-off-by: Alan Jowett

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Userspace eBPF VM

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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

Instruction set reference

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. After building the library you can install using make -C vm install via either root or sudo.

Running the tests

To run the tests, you first need to build the vm code then use nosetests to execute the tests. Note: The tests have some dependencies that need to be present. See the .travis.yml for details.

Before running the test (assuming Debian derived distro)

sudo apt-get update
sudo apt-get -y install python python-pip python-setuptools python-wheel python-nose
python2 -m pip install --upgrade "pip<21.0"
python2 -m pip install -r requirements.txt
python2 -m pip install cpp-coveralls

Running the test

make -C vm COVERAGE=1
nosetests -v   # run tests

After running the test

coveralls --gcov-options '\-lp' -i $PWD/vm/ubpf_vm.c -i $PWD/vm/ubpf_jit_x86_64.c -i $PWD/vm/ubpf_loader.c

Compiling C to eBPF

You'll need Clang 3.7.

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>.


Userspace eBPF VM




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