283 строки
8.5 KiB
Rust
283 строки
8.5 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
use crate::helpers::*;
|
|
use proc_macro::{token_stream, Literal, TokenStream, TokenTree};
|
|
use std::fmt::Write;
|
|
|
|
struct ModInfoBuilder<'a> {
|
|
module: &'a str,
|
|
counter: usize,
|
|
buffer: String,
|
|
}
|
|
|
|
impl<'a> ModInfoBuilder<'a> {
|
|
fn new(module: &'a str) -> Self {
|
|
ModInfoBuilder {
|
|
module,
|
|
counter: 0,
|
|
buffer: String::new(),
|
|
}
|
|
}
|
|
|
|
fn emit_base(&mut self, field: &str, content: &str, builtin: bool) {
|
|
let string = if builtin {
|
|
// Built-in modules prefix their modinfo strings by `module.`.
|
|
format!(
|
|
"{module}.{field}={content}\0",
|
|
module = self.module,
|
|
field = field,
|
|
content = content
|
|
)
|
|
} else {
|
|
// Loadable modules' modinfo strings go as-is.
|
|
format!("{field}={content}\0", field = field, content = content)
|
|
};
|
|
|
|
write!(
|
|
&mut self.buffer,
|
|
"
|
|
{cfg}
|
|
#[doc(hidden)]
|
|
#[link_section = \".modinfo\"]
|
|
#[used]
|
|
pub static __{module}_{counter}: [u8; {length}] = *{string};
|
|
",
|
|
cfg = if builtin {
|
|
"#[cfg(not(MODULE))]"
|
|
} else {
|
|
"#[cfg(MODULE)]"
|
|
},
|
|
module = self.module.to_uppercase(),
|
|
counter = self.counter,
|
|
length = string.len(),
|
|
string = Literal::byte_string(string.as_bytes()),
|
|
)
|
|
.unwrap();
|
|
|
|
self.counter += 1;
|
|
}
|
|
|
|
fn emit_only_builtin(&mut self, field: &str, content: &str) {
|
|
self.emit_base(field, content, true)
|
|
}
|
|
|
|
fn emit_only_loadable(&mut self, field: &str, content: &str) {
|
|
self.emit_base(field, content, false)
|
|
}
|
|
|
|
fn emit(&mut self, field: &str, content: &str) {
|
|
self.emit_only_builtin(field, content);
|
|
self.emit_only_loadable(field, content);
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Default)]
|
|
struct ModuleInfo {
|
|
type_: String,
|
|
license: String,
|
|
name: String,
|
|
author: Option<String>,
|
|
description: Option<String>,
|
|
alias: Option<String>,
|
|
}
|
|
|
|
impl ModuleInfo {
|
|
fn parse(it: &mut token_stream::IntoIter) -> Self {
|
|
let mut info = ModuleInfo::default();
|
|
|
|
const EXPECTED_KEYS: &[&str] =
|
|
&["type", "name", "author", "description", "license", "alias"];
|
|
const REQUIRED_KEYS: &[&str] = &["type", "name", "license"];
|
|
let mut seen_keys = Vec::new();
|
|
|
|
loop {
|
|
let key = match it.next() {
|
|
Some(TokenTree::Ident(ident)) => ident.to_string(),
|
|
Some(_) => panic!("Expected Ident or end"),
|
|
None => break,
|
|
};
|
|
|
|
if seen_keys.contains(&key) {
|
|
panic!(
|
|
"Duplicated key \"{}\". Keys can only be specified once.",
|
|
key
|
|
);
|
|
}
|
|
|
|
assert_eq!(expect_punct(it), ':');
|
|
|
|
match key.as_str() {
|
|
"type" => info.type_ = expect_ident(it),
|
|
"name" => info.name = expect_byte_string(it),
|
|
"author" => info.author = Some(expect_byte_string(it)),
|
|
"description" => info.description = Some(expect_byte_string(it)),
|
|
"license" => info.license = expect_byte_string(it),
|
|
"alias" => info.alias = Some(expect_byte_string(it)),
|
|
_ => panic!(
|
|
"Unknown key \"{}\". Valid keys are: {:?}.",
|
|
key, EXPECTED_KEYS
|
|
),
|
|
}
|
|
|
|
assert_eq!(expect_punct(it), ',');
|
|
|
|
seen_keys.push(key);
|
|
}
|
|
|
|
expect_end(it);
|
|
|
|
for key in REQUIRED_KEYS {
|
|
if !seen_keys.iter().any(|e| e == key) {
|
|
panic!("Missing required key \"{}\".", key);
|
|
}
|
|
}
|
|
|
|
let mut ordered_keys: Vec<&str> = Vec::new();
|
|
for key in EXPECTED_KEYS {
|
|
if seen_keys.iter().any(|e| e == key) {
|
|
ordered_keys.push(key);
|
|
}
|
|
}
|
|
|
|
if seen_keys != ordered_keys {
|
|
panic!(
|
|
"Keys are not ordered as expected. Order them like: {:?}.",
|
|
ordered_keys
|
|
);
|
|
}
|
|
|
|
info
|
|
}
|
|
}
|
|
|
|
pub(crate) fn module(ts: TokenStream) -> TokenStream {
|
|
let mut it = ts.into_iter();
|
|
|
|
let info = ModuleInfo::parse(&mut it);
|
|
|
|
let mut modinfo = ModInfoBuilder::new(info.name.as_ref());
|
|
if let Some(author) = info.author {
|
|
modinfo.emit("author", &author);
|
|
}
|
|
if let Some(description) = info.description {
|
|
modinfo.emit("description", &description);
|
|
}
|
|
modinfo.emit("license", &info.license);
|
|
if let Some(alias) = info.alias {
|
|
modinfo.emit("alias", &alias);
|
|
}
|
|
|
|
// Built-in modules also export the `file` modinfo string.
|
|
let file =
|
|
std::env::var("RUST_MODFILE").expect("Unable to fetch RUST_MODFILE environmental variable");
|
|
modinfo.emit_only_builtin("file", &file);
|
|
|
|
format!(
|
|
"
|
|
/// The module name.
|
|
///
|
|
/// Used by the printing macros, e.g. [`info!`].
|
|
const __LOG_PREFIX: &[u8] = b\"{name}\\0\";
|
|
|
|
/// The \"Rust loadable module\" mark, for `scripts/is_rust_module.sh`.
|
|
//
|
|
// This may be best done another way later on, e.g. as a new modinfo
|
|
// key or a new section. For the moment, keep it simple.
|
|
#[cfg(MODULE)]
|
|
#[doc(hidden)]
|
|
#[used]
|
|
static __IS_RUST_MODULE: () = ();
|
|
|
|
static mut __MOD: Option<{type_}> = None;
|
|
|
|
// SAFETY: `__this_module` is constructed by the kernel at load time and will not be
|
|
// freed until the module is unloaded.
|
|
#[cfg(MODULE)]
|
|
static THIS_MODULE: kernel::ThisModule = unsafe {{
|
|
kernel::ThisModule::from_ptr(&kernel::bindings::__this_module as *const _ as *mut _)
|
|
}};
|
|
#[cfg(not(MODULE))]
|
|
static THIS_MODULE: kernel::ThisModule = unsafe {{
|
|
kernel::ThisModule::from_ptr(core::ptr::null_mut())
|
|
}};
|
|
|
|
// Loadable modules need to export the `{{init,cleanup}}_module` identifiers.
|
|
#[cfg(MODULE)]
|
|
#[doc(hidden)]
|
|
#[no_mangle]
|
|
pub extern \"C\" fn init_module() -> core::ffi::c_int {{
|
|
__init()
|
|
}}
|
|
|
|
#[cfg(MODULE)]
|
|
#[doc(hidden)]
|
|
#[no_mangle]
|
|
pub extern \"C\" fn cleanup_module() {{
|
|
__exit()
|
|
}}
|
|
|
|
// Built-in modules are initialized through an initcall pointer
|
|
// and the identifiers need to be unique.
|
|
#[cfg(not(MODULE))]
|
|
#[cfg(not(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS))]
|
|
#[doc(hidden)]
|
|
#[link_section = \"{initcall_section}\"]
|
|
#[used]
|
|
pub static __{name}_initcall: extern \"C\" fn() -> core::ffi::c_int = __{name}_init;
|
|
|
|
#[cfg(not(MODULE))]
|
|
#[cfg(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)]
|
|
core::arch::global_asm!(
|
|
r#\".section \"{initcall_section}\", \"a\"
|
|
__{name}_initcall:
|
|
.long __{name}_init - .
|
|
.previous
|
|
\"#
|
|
);
|
|
|
|
#[cfg(not(MODULE))]
|
|
#[doc(hidden)]
|
|
#[no_mangle]
|
|
pub extern \"C\" fn __{name}_init() -> core::ffi::c_int {{
|
|
__init()
|
|
}}
|
|
|
|
#[cfg(not(MODULE))]
|
|
#[doc(hidden)]
|
|
#[no_mangle]
|
|
pub extern \"C\" fn __{name}_exit() {{
|
|
__exit()
|
|
}}
|
|
|
|
fn __init() -> core::ffi::c_int {{
|
|
match <{type_} as kernel::Module>::init(&THIS_MODULE) {{
|
|
Ok(m) => {{
|
|
unsafe {{
|
|
__MOD = Some(m);
|
|
}}
|
|
return 0;
|
|
}}
|
|
Err(e) => {{
|
|
return e.to_kernel_errno();
|
|
}}
|
|
}}
|
|
}}
|
|
|
|
fn __exit() {{
|
|
unsafe {{
|
|
// Invokes `drop()` on `__MOD`, which should be used for cleanup.
|
|
__MOD = None;
|
|
}}
|
|
}}
|
|
|
|
{modinfo}
|
|
",
|
|
type_ = info.type_,
|
|
name = info.name,
|
|
modinfo = modinfo.buffer,
|
|
initcall_section = ".initcall6.init"
|
|
)
|
|
.parse()
|
|
.expect("Error parsing formatted string into token stream.")
|
|
}
|