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+# Contributing to `gimli`
+
+Hi! We'd love to have your contributions! If you want help or mentorship, reach
+out to us in a GitHub issue, or ping `fitzgen` in `#rust` on `irc.mozilla.org`.
+
+* [Code of Conduct](#coc)
+* [Filing an Issue](#issues)
+* [Building `gimli`](#building)
+* [Testing `gimli`](#testing)
+  * [Test Coverage](#coverage)
+  * [Using `test-assembler`](#test-assembler)
+  * [Fuzzing](#fuzzing)
+* [Benchmarking](#benchmarking)
+* [Style](#style)
+
+## <a id="coc"></a> Code of Conduct
+
+We abide by the
+[Rust Code of Conduct](https://www.rust-lang.org/en-US/conduct.html) and ask
+that you do as well.
+
+## <a id="issues"></a> Filing an Issue
+
+Think you've found a bug? File an issue! To help us understand and reproduce the
+issue, provide us with:
+
+* The (preferably minimal) test case
+* Steps to reproduce the issue using the test case
+* The expected result of following those steps
+* The actual result of following those steps
+
+Definitely file an issue if you see an unexpected panic originating from within
+`gimli`! `gimli` should never panic unless it is explicitly documented to panic
+in the specific circumstances provided.
+
+## <a id="building"></a> Building `gimli`
+
+`gimli` should always build on stable `rustc`, but we recommend using
+[`rustup`](https://www.rustup.rs/) so you can switch to nightly `rustc` and run
+benchmarks.
+
+To build `gimli`:
+
+```
+$ cargo build
+```
+
+## <a id="testing"></a> Testing `gimli`
+
+Run the tests with `cargo`:
+
+```
+$ cargo test
+```
+
+### <a id="coverage"></a> Test Coverage
+
+If you have `kcov` installed under linux, then you can generate code coverage
+results using the `coverage` script in the root of the repository, and view them
+at `target/kcov/index.html`. Otherwise you can create a pull request and view
+the coverage results on coveralls.io.
+
+```
+$ ./coverage
+```
+
+The ideal we aim to reach is having our unit tests exercise every branch in
+`gimli`. We allow an exception for branches which propagate errors inside a
+`try!(..)` invocation, but we *do* want to exercise the original error paths.
+
+Pull requests adding new code should ensure that this ideal is met.
+
+At the time of writing we have 94% test coverage according to our coveralls.io
+continuous integration. That number should generally stay the same or go up ;)
+This is a bit subjective, because -.001% is just noise and doesn't matter.
+
+### <a id="test-assembler"></a> Using `test-assembler`
+
+We use the awesome
+[`test-assembler`](https://github.com/luser/rust-test-assembler) crate to
+construct binary test data. It makes building complex test cases readable.
+
+[Here is an example usage in `gimli`](https://github.com/gimli-rs/gimli/blob/156451f3fe6eeb2fa62b84b362c33fcb176e1171/src/loc.rs#L263)
+
+### <a id="fuzzing"></a> Fuzzing
+
+First, install `cargo fuzz`:
+
+```
+$ cargo install cargo-fuzz
+```
+
+Optionally, [set up the corpora for our fuzz targets by following these
+instructions](https://github.com/gimli-rs/gimli-libfuzzer-corpora/blob/master/README.md#using-these-corpora).
+
+Finally, run a fuzz target! In this case, we are running the `eh_frame` fuzz
+target:
+
+```
+$ cargo fuzz run eh_frame
+```
+
+The fuzz target definitions live in `fuzz/fuzz_targets/*`. You can add new ones
+via `cargo fuzz add <my_new_target>`.
+
+## <a id="benchmarking"></a> Benchmarking
+
+The benchmarks require nightly `rustc`, so use `rustup`:
+
+```
+$ rustup run nightly cargo bench
+```
+
+We aim to be the fastest DWARF library. Period.
+
+Please provide before and after benchmark results with your pull requests. You
+may also find [`cargo benchcmp`](https://github.com/BurntSushi/cargo-benchcmp)
+handy for comparing results.
+
+Pull requests adding `#[bench]` micro-benchmarks that exercise a new edge case
+are very welcome!
+
+## <a id="style"></a> Style
+
+We use `rustfmt` to automatically format and style all of our code.
+
+To install `rustfmt`:
+
+```
+$ rustup component add rustfmt-preview
+```
+
+To run `rustfmt` on `gimli`:
+
+```
+$ cargo fmt
+```