btfdump

BTF introspection tool.

Compiling

btfdump is written in Rust and relies on standard Cargo package manager.

To compile btfdump:

1. Get rust toolchain. See https://www.rust-lang.org/tools/install for instructions. a. Using rustup is the simplest option: just run curl https://sh.rustup.rs -sSf | sh. b. If you are behind HTTP/HTTPS proxy, you can specify it using http_proxy and https_proxy envvars:

   $ export http_proxy=http://fwdproxy:8080
   $ export https_proxy=http://fwdproxy:8080
   $ curl https://sh.rustup.rs -sSf | sh
   

2. Once Cargo and rustc is installed, run cargo build or cargo build --release to compile it. This will build btf binary in target/{debug,release}/ directory.
3. Alternatively, you can use cargo run -- <args> to compile and run through Cargo.

Supported commands

Dump

1. Dump BTF types in various formats:

btf dump --format [human|c] <elf-file>

2. You can filter out which types to print out using --type, --name, and --id options. See btf dump --help for more details.
3. Check also --dataset option for dumping .BTF.ext data as well.

Stat

Output high-level stats about .BTF and .BTF.ext data.

btf stat <elf-file>