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// SPDX-License-Identifier: GPL-2.0
use std::path::PathBuf;
use std::env;
const INCLUDED_TYPES: &[&str] = &["file_system_type", "mode_t", "umode_t", "ctl_table"];
const INCLUDED_FUNCTIONS: &[&str] = &[
"cdev_add",
"cdev_init",
"cdev_del",
"register_filesystem",
"unregister_filesystem",
"krealloc",
"kfree",
"mount_nodev",
"kill_litter_super",
"register_sysctl",
"unregister_sysctl_table",
"access_ok",
"_copy_to_user",
"_copy_from_user",
"alloc_chrdev_region",
"unregister_chrdev_region",
"wait_for_random_bytes",
"get_random_bytes",
"rng_is_initialized",
"printk",
"add_device_randomness",
];
const INCLUDED_VARS: &[&str] = &[
"EINVAL",
"ENOMEM",
"ESPIPE",
"EFAULT",
"EAGAIN",
"__this_module",
"FS_REQUIRES_DEV",
"FS_BINARY_MOUNTDATA",
"FS_HAS_SUBTYPE",
"FS_USERNS_MOUNT",
"FS_RENAME_DOES_D_MOVE",
"BINDINGS_GFP_KERNEL",
"KERN_INFO",
"VERIFY_WRITE",
"LINUX_VERSION_CODE",
"SEEK_SET",
"SEEK_CUR",
"SEEK_END",
"O_NONBLOCK",
"param_ops_bool",
"param_ops_int",
];
const OPAQUE_TYPES: &[&str] = &[
// These need to be opaque because they're both packed and aligned, which rustc
// doesn't support yet. See https://github.com/rust-lang/rust/issues/59154
// and https://github.com/rust-lang/rust-bindgen/issues/1538
"desc_struct",
"xregs_state",
];
// Takes the CFLAGS from the kernel Makefile and changes all the include paths to be absolute
// instead of relative.
fn prepare_cflags(cflags: &str, kernel_dir: &str) -> Vec<String> {
let cflag_parts = shlex::split(&cflags).unwrap();
let mut cflag_iter = cflag_parts.iter();
let mut kernel_args = vec![];
while let Some(arg) = cflag_iter.next() {
// TODO: bindgen complains
if arg.starts_with("-Wp,-MMD") {
continue;
}
if arg.starts_with("-I") && !arg.starts_with("-I/") {
kernel_args.push(format!("-I{}/{}", kernel_dir, &arg[2..]));
} else if arg == "-include" {
kernel_args.push(arg.to_string());
let include_path = cflag_iter.next().unwrap();
if include_path.starts_with('/') {
kernel_args.push(include_path.to_string());
} else {
kernel_args.push(format!("{}/{}", kernel_dir, include_path));
}
} else {
kernel_args.push(arg.to_string());
}
}
kernel_args
}
fn main() {
println!("cargo:rerun-if-env-changed=CC");
println!("cargo:rerun-if-env-changed=RUST_BINDGEN_CFLAGS");
let kernel_dir = "../../";
let cflags = env::var("RUST_BINDGEN_CFLAGS")
.expect("Must be invoked from kernel makefile");
let kernel_args = prepare_cflags(&cflags, &kernel_dir);
let target = env::var("TARGET").unwrap();
let mut builder = bindgen::Builder::default()
.use_core()
.ctypes_prefix("c_types")
.derive_default(true)
.size_t_is_usize(true)
.rustfmt_bindings(true);
builder = builder.clang_arg(format!("--target={}", target));
for arg in kernel_args.iter() {
builder = builder.clang_arg(arg.clone());
}
println!("cargo:rerun-if-changed=src/bindings_helper.h");
builder = builder.header("src/bindings_helper.h");
for t in INCLUDED_TYPES {
builder = builder.whitelist_type(t);
}
for f in INCLUDED_FUNCTIONS {
builder = builder.whitelist_function(f);
}
for v in INCLUDED_VARS {
builder = builder.whitelist_var(v);
}
for t in OPAQUE_TYPES {
builder = builder.opaque_type(t);
}
let bindings = builder.generate().expect("Unable to generate bindings");
let out_path = PathBuf::from("src/bindings_gen.rs");
bindings
.write_to_file(out_path)
.expect("Couldn't write bindings!");
}
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