#mach-o #x86 #elf #disassembly #extension #format

app elfx86exts

Decode x86 binaries (ELF or MachO) and print out which instruction set extensions they use

9 releases (5 breaking)

0.6.2 Oct 22, 2023
0.6.1 Oct 21, 2023
0.5.0 Oct 18, 2021
0.4.3 Sep 1, 2020
0.1.0 Sep 29, 2017

#298 in Parser implementations

33 downloads per month

MIT license

285 lines


Disassemble a binary and print out which instruction set extensions it uses. Despite the utterly misleading name, this tool supports ELF and MachO binaries, and perhaps other formats as well, and has preliminary support for ARM64 as well as X86/64. It used to be a lot more limited!

I have no idea what I'm doing here, but it seems to work. There are several Rust crates that make this pretty easy to do.

Change Log

See the CHANGELOG on the release branch for news about what has changed between releases.



This tool is installable through a few package managers:

If you are interested in packaging elfx86exts in a new packaging system, or have already done so, please submit a PR to add it to this list.

Compiling the Latest Release

If a package is not available, in most cases it will be straightforward to build elfx86exts yourself. Dependencies are:

Both of these dependencies are available through a wide variety of package managers. Once they’re set up, you don’t even need to check out this repository to install the latest release. Simply run:

cargo install elfx86exts

… and the tool will be installed in your Cargo binary directory, usually ~/.cargo/bin/. When using this method, you need to add the --force flag to upgrade from one version to the next.

Compiling the Code From Git

This is hardly any more difficult than the above. Check out this repository, then run:

cargo install --path .

To develop the program, use the cargo build and cargo run commands. For more information, see The Cargo Book.


Contributions are welcome! Please submit PRs against this repository, or file issues for discussion. The only important rule is that all participants are expected to abide by the spirit of a standard Contributor Covenant code of conduct. All contributions will be assumed to be licensed under the terms described below unless you explicitly state otherwise.


Licensed under the MIT License.


~1M SLoC