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* rust: str: add `CStr` unit testsMilan Landaverde2022-12-041-0/+29
| | | | | | | | | | | | Add unit tests for `CStr::from_bytes_with_nul()` and `CStr::from_bytes_with_nul_unchecked()`. These serve as an example of the first unit tests for Rust code (i.e. different from documentation tests). Signed-off-by: Milan Landaverde <milan@mdaverde.com> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: str: implement several traits for `CStr`Gary Guo2022-12-041-1/+123
| | | | | | | | | | | | | | | Implement `Debug`, `Display`, `Deref` (into `BStr`), `AsRef<BStr>` and a set of `Index<...>` traits. This makes it `CStr` more convenient to use (and closer to `str`). Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Morgan Bartlett <mjmouse9999@gmail.com> Signed-off-by: Morgan Bartlett <mjmouse9999@gmail.com> Signed-off-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: str: add `CStr` typeGary Guo2022-12-042-1/+170
| | | | | | | | | | | | | | | | | Add the `CStr` type, which is a borrowed string that is guaranteed to have exactly one `NUL` byte, which is at the end. It is used for interoperability with kernel APIs that take C strings. Add it to the prelude too. Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Milan Landaverde <milan@mdaverde.com> Signed-off-by: Milan Landaverde <milan@mdaverde.com> Signed-off-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: str: add `b_str!` macroGary Guo2022-12-041-0/+21
| | | | | | | | | | | | | Add the `b_str!` macro, which creates a new `BStr` from a string literal. It is usable in const contexts, for instance: const X: &BStr = b_str!("Example"); Signed-off-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: str: add `BStr` typeGary Guo2022-12-041-0/+5
| | | | | | | | | | | | Add the `BStr` type, which is a byte string without UTF-8 validity guarantee. It is simply an alias to `[u8]`, but has a more evident semantical meaning. Signed-off-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: alloc: add `Vec::try_with_capacity{,_in}()` constructorsMiguel Ojeda2022-12-042-1/+89
| | | | | | | | | | | | | | | Add `Vec::try_with_capacity()` and `Vec::try_with_capacity_in()` as the fallible versions of `Vec::with_capacity()` and `Vec::with_capacity_in()`, respectively. The implementations follow the originals and use the previously added `RawVec::try_with_capacity_in()`. In turn, `Vec::try_with_capacity()` will be used to implement the `CString` type (which wraps a `Vec<u8>`) in a later patch. Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: alloc: add `RawVec::try_with_capacity_in()` constructorMiguel Ojeda2022-12-041-1/+33
| | | | | | | | | | | | | | | | | Add the `RawVec::try_with_capacity_in()` constructor as the fallible version of `RawVec::with_capacity_in()`. The implementation follows the original. The infallible constructor is implemented in terms of the private `RawVec::allocate_in()` constructor, thus also add the private `RawVec::try_allocate_in()` constructor following the other. It will be used to implement `Vec::try_with_capacity{,_in}()` in the next patch. Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: prelude: add `error::code::*` constant itemsWedson Almeida Filho2022-12-041-1/+1
| | | | | | | | | | | | | | | | | | | | | It is convenient to have all the `Error` constant items (such as `EINVAL`) available as-is everywhere (i.e. for code using the kernel prelude such as kernel modules). Therefore, add all of them to the prelude. For instance, this allows to write `Err(EINVAL)` to create a kernel `Result`: fn f() -> Result<...> { ... Err(EINVAL) } Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com> Reviewed-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: error: add `From` implementations for `Error`Wedson Almeida Filho2022-12-042-1/+45
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a set of `From` implementations for the `Error` kernel type. These implementations allow to easily convert from standard Rust error types to the usual kernel errors based on one of the `E*` integer codes. On top of that, the question mark Rust operator (`?`) implicitly performs a conversion on the error value using the `From` trait when propagating. Thus it is extra convenient to use. For instance, a kernel function that needs to convert a `i64` into a `i32` and to bubble up the error as a kernel error may write: fn f(x: i64) -> Result<...> { ... let y = i32::try_from(x)?; ... } which will transform the `TryFromIntError` into an `Err(EINVAL)`. Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com> Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com> Co-developed-by: Nándor István Krácser <bonifaido@gmail.com> Signed-off-by: Nándor István Krácser <bonifaido@gmail.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com> Reviewed-by: Finn Behrens <me@kloenk.dev> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: error: add codes from `errno-base.h`Viktor Garske2022-12-041-0/+33
| | | | | | | | | | | | | Only a few codes were added so far. With the `declare_err!` macro in place, add the remaining ones (which is most of them) from `include/uapi/asm-generic/errno-base.h`. Co-developed-by: Wedson Almeida Filho <wedsonaf@gmail.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com> Signed-off-by: Viktor Garske <viktor@v-gar.de> Reviewed-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: error: declare errors using macroFinn Behrens2022-12-041-2/+10
| | | | | | | | | | | Add a macro to declare errors, which simplifies the work needed to add each one, avoids repetition of the code and makes it easier to change the way they are declared. Signed-off-by: Finn Behrens <me@kloenk.dev> Reviewed-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: macros: take string literals in `module!`Gary Guo2022-12-043-17/+29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of taking binary string literals, take string ones instead, making it easier for users to define a module, i.e. instead of calling `module!` like: module! { ... name: b"rust_minimal", ... } now it is called as: module! { ... name: "rust_minimal", ... } Module names, aliases and license strings are restricted to ASCII only. However, the author and the description allows UTF-8. For simplicity (avoid parsing), escape sequences and raw string literals are not yet handled. Link: https://github.com/Rust-for-Linux/linux/issues/252 Link: https://lore.kernel.org/lkml/YukvvPOOu8uZl7+n@yadro.com/ Signed-off-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: macros: add `#[vtable]` proc macroGary Guo2022-12-043-1/+148
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This procedural macro attribute provides a simple way to declare a trait with a set of operations that later users can partially implement, providing compile-time `HAS_*` boolean associated constants that indicate whether a particular operation was overridden. This is useful as the Rust counterpart to structs like `file_operations` where some pointers may be `NULL`, indicating an operation is not provided. For instance: #[vtable] trait Operations { fn read(...) -> Result<usize> { Err(EINVAL) } fn write(...) -> Result<usize> { Err(EINVAL) } } #[vtable] impl Operations for S { fn read(...) -> Result<usize> { ... } } assert_eq!(<S as Operations>::HAS_READ, true); assert_eq!(<S as Operations>::HAS_WRITE, false); Signed-off-by: Gary Guo <gary@garyguo.net> Reviewed-by: Sergio González Collado <sergio.collado@gmail.com> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: macros: add `concat_idents!` proc macroBjörn Roy Baron2022-12-042-0/+67
| | | | | | | | | | | | | | | | | | | | | | This macro provides similar functionality to the unstable feature `concat_idents` without having to rely on it. For instance: let x_1 = 42; let x_2 = concat_idents!(x, _1); assert!(x_1 == x_2); It has different behavior with respect to macro hygiene. Unlike the unstable `concat_idents!` macro, it allows, for example, referring to local variables by taking the span of the second macro as span for the output identifier. Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Reviewed-by: Finn Behrens <me@kloenk.dev> Reviewed-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: print: add `pr_cont!` macroMiguel Ojeda2022-12-011-9/+63
| | | | | | | | | | | | | | | | | | This level is a bit different from the rest since it does not pass the module name to the `_printk()` call. Thus add a new parameter to the general `print_macro!` to handle it differently. Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com> Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@gmail.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Reviewed-by: Wei Liu <wei.liu@kernel.org> Reviewed-by: Sergio González Collado <sergio.collado@gmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: print: add more `pr_*!` levelsMiguel Ojeda2022-12-012-1/+155
| | | | | | | | | | | | | | | | | | | Currently, only `pr_info!` (for the minimal sample) and `pr_emerg!` (for the panic handler) are there. Add the other levels as new macros, i.e. `pr_alert!`, `pr_crit!`, `pr_err!`, `pr_warn!`, `pr_notice!` and `pr_debug!`. Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com> Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@gmail.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Reviewed-by: Wei Liu <wei.liu@kernel.org> Reviewed-by: Sergio Gonzalez Collado <sergio.collado@gmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: prelude: split re-exports into groupsMiguel Ojeda2022-12-011-5/+9
| | | | | | | | | | | | | | Split the prelude re-exports into groups: first the ones coming from the `core` crate, then `alloc`, then our own crates and finally the ones from modules from `kernel` itself (i.e. `super`). We are doing this manually for the moment, but ideally, long-term, this could be automated via `rustfmt` with options such as `group_imports` and `imports_granularity` (both currently unstable). Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Reviewed-by: Wei Liu <wei.liu@kernel.org> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* Kbuild: add Rust supportMiguel Ojeda2022-09-283-0/+410
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Having most of the new files in place, we now enable Rust support in the build system, including `Kconfig` entries related to Rust, the Rust configuration printer and a few other bits. Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Finn Behrens <me@kloenk.de> Signed-off-by: Finn Behrens <me@kloenk.de> Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com> Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Co-developed-by: Sven Van Asbroeck <thesven73@gmail.com> Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Co-developed-by: Boris-Chengbiao Zhou <bobo1239@web.de> Signed-off-by: Boris-Chengbiao Zhou <bobo1239@web.de> Co-developed-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Co-developed-by: Douglas Su <d0u9.su@outlook.com> Signed-off-by: Douglas Su <d0u9.su@outlook.com> Co-developed-by: Dariusz Sosnowski <dsosnowski@dsosnowski.pl> Signed-off-by: Dariusz Sosnowski <dsosnowski@dsosnowski.pl> Co-developed-by: Antonio Terceiro <antonio.terceiro@linaro.org> Signed-off-by: Antonio Terceiro <antonio.terceiro@linaro.org> Co-developed-by: Daniel Xu <dxu@dxuuu.xyz> Signed-off-by: Daniel Xu <dxu@dxuuu.xyz> Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Co-developed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: export generated symbolsMiguel Ojeda2022-09-281-0/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | All symbols are reexported reusing the `EXPORT_SYMBOL_GPL` macro from C. The lists of symbols are generated on the fly. There are three main sets of symbols to distinguish: - The ones from the `core` and `alloc` crates (from the Rust standard library). The code is licensed as Apache/MIT. - The ones from our abstractions in the `kernel` crate. - The helpers (already exported since they are not generated). We export everything as GPL. This ensures we do not mistakenly expose GPL kernel symbols/features as non-GPL, even indirectly. Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: add `kernel` crateWedson Almeida Filho2022-09-286-0/+491
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The `kernel` crate currently includes all the abstractions that wrap kernel features written in C. These abstractions call the C side of the kernel via the generated bindings with the `bindgen` tool. Modules developed in Rust should never call the bindings themselves. In the future, as the abstractions grow in number, we may need to split this crate into several, possibly following a similar subdivision in subsystems as the kernel itself and/or moving the code to the actual subsystems. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Geoffrey Thomas <geofft@ldpreload.com> Signed-off-by: Geoffrey Thomas <geofft@ldpreload.com> Co-developed-by: Finn Behrens <me@kloenk.de> Signed-off-by: Finn Behrens <me@kloenk.de> Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com> Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com> Co-developed-by: Sven Van Asbroeck <thesven73@gmail.com> Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Co-developed-by: Boris-Chengbiao Zhou <bobo1239@web.de> Signed-off-by: Boris-Chengbiao Zhou <bobo1239@web.de> Co-developed-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Co-developed-by: Fox Chen <foxhlchen@gmail.com> Signed-off-by: Fox Chen <foxhlchen@gmail.com> Co-developed-by: Viktor Garske <viktor@v-gar.de> Signed-off-by: Viktor Garske <viktor@v-gar.de> Co-developed-by: Dariusz Sosnowski <dsosnowski@dsosnowski.pl> Signed-off-by: Dariusz Sosnowski <dsosnowski@dsosnowski.pl> Co-developed-by: Léo Lanteri Thauvin <leseulartichaut@gmail.com> Signed-off-by: Léo Lanteri Thauvin <leseulartichaut@gmail.com> Co-developed-by: Niklas Mohrin <dev@niklasmohrin.de> Signed-off-by: Niklas Mohrin <dev@niklasmohrin.de> Co-developed-by: Milan Landaverde <milan@mdaverde.com> Signed-off-by: Milan Landaverde <milan@mdaverde.com> Co-developed-by: Morgan Bartlett <mjmouse9999@gmail.com> Signed-off-by: Morgan Bartlett <mjmouse9999@gmail.com> Co-developed-by: Maciej Falkowski <m.falkowski@samsung.com> Signed-off-by: Maciej Falkowski <m.falkowski@samsung.com> Co-developed-by: Nándor István Krácser <bonifaido@gmail.com> Signed-off-by: Nándor István Krácser <bonifaido@gmail.com> Co-developed-by: David Gow <davidgow@google.com> Signed-off-by: David Gow <davidgow@google.com> Co-developed-by: John Baublitz <john.m.baublitz@gmail.com> Signed-off-by: John Baublitz <john.m.baublitz@gmail.com> Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: add `bindings` crateMiguel Ojeda2022-09-282-0/+66
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This crate contains the bindings to the C side of the kernel. Calling C (in general, FFI) is assumed to be unsafe in Rust and, in many cases, this is accurate. For instance, virtually all C functions that take a pointer are unsafe since, typically, it will be dereferenced at some point (and in most cases there is no way for the callee to check its validity beforehand). Since one of the goals of using Rust in the kernel is precisely to avoid unsafe code in "leaf" kernel modules (e.g. drivers), these bindings should not be used directly by them. Instead, these bindings need to be wrapped into safe abstractions. These abstractions provide a safe API that kernel modules can use. In this way, unsafe code in kernel modules is minimized. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Finn Behrens <me@kloenk.de> Signed-off-by: Finn Behrens <me@kloenk.de> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Sven Van Asbroeck <thesven73@gmail.com> Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Co-developed-by: Maciej Falkowski <m.falkowski@samsung.com> Signed-off-by: Maciej Falkowski <m.falkowski@samsung.com> Co-developed-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: add `macros` crateMiguel Ojeda2022-09-283-0/+405
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This crate contains all the procedural macros ("proc macros") shared by all the kernel. Procedural macros allow to create syntax extensions. They run at compile-time and can consume as well as produce Rust syntax. For instance, the `module!` macro that is used by Rust modules is implemented here. It allows to easily declare the equivalent information to the `MODULE_*` macros in C modules, e.g.: module! { type: RustMinimal, name: b"rust_minimal", author: b"Rust for Linux Contributors", description: b"Rust minimal sample", license: b"GPL", } Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Finn Behrens <me@kloenk.de> Signed-off-by: Finn Behrens <me@kloenk.de> Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com> Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Sumera Priyadarsini <sylphrenadin@gmail.com> Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Co-developed-by: Matthew Bakhtiari <dev@mtbk.me> Signed-off-by: Matthew Bakhtiari <dev@mtbk.me> Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: add `compiler_builtins` crateMiguel Ojeda2022-09-281-0/+63
| | | | | | | | | | | | | | | | | Rust provides `compiler_builtins` as a port of LLVM's `compiler-rt`. Since we do not need the vast majority of them, we avoid the dependency by providing our own crate. Reviewed-by: Kees Cook <keescook@chromium.org> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Sven Van Asbroeck <thesven73@gmail.com> Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: adapt `alloc` crate to the kernelMiguel Ojeda2022-09-2814-1/+100
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This customizes the subset of the Rust standard library `alloc` that was just imported as-is, mainly by: - Adding SPDX license identifiers. - Skipping modules (e.g. `rc` and `sync`) via new `cfg`s. - Adding fallible (`try_*`) versions of existing infallible methods (i.e. returning a `Result` instead of panicking). Since the standard library requires stable/unstable attributes, these additions are annotated with: #[stable(feature = "kernel", since = "1.0.0")] Using "kernel" as the feature allows to have the additions clearly marked. The "1.0.0" version is just a placeholder. (At the moment, only one is needed, but in the future more fallible methods will be added). Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Co-developed-by: Matthew Bakhtiari <dev@mtbk.me> Signed-off-by: Matthew Bakhtiari <dev@mtbk.me> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: import upstream `alloc` crateMiguel Ojeda2022-09-2813-0/+9037
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a subset of the Rust standard library `alloc` crate, version 1.62.0, licensed under "Apache-2.0 OR MIT", from: https://github.com/rust-lang/rust/tree/1.62.0/library/alloc/src The files are copied as-is, with no modifications whatsoever (not even adding the SPDX identifiers). For copyright details, please see: https://github.com/rust-lang/rust/blob/1.62.0/COPYRIGHT The next patch modifies these files as needed for use within the kernel. This patch split allows reviewers to double-check the import and to clearly see the differences introduced. Vendoring `alloc`, at least for the moment, allows us to have fallible allocations support (i.e. the `try_*` versions of methods which return a `Result` instead of panicking) early on. It also gives a bit more freedom to experiment with new interfaces and to iterate quickly. Eventually, the goal is to have everything the kernel needs in upstream `alloc` and drop it from the kernel tree. For a summary of work on `alloc` happening upstream, please see: https://github.com/Rust-for-Linux/linux/issues/408 The following script may be used to verify the contents: for path in $(cd rust/alloc/ && find . -type f -name '*.rs'); do curl --silent --show-error --location \ https://github.com/rust-lang/rust/raw/1.62.0/library/alloc/src/$path \ | diff --unified rust/alloc/$path - && echo $path: OK done Reviewed-by: Kees Cook <keescook@chromium.org> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
* rust: add C helpersMiguel Ojeda2022-09-281-0/+51
Introduces the source file that will contain forwarders to C macros and inlined functions. Initially this only contains a single helper, but will gain more as more functionality is added to the `kernel` crate in the future. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Geoffrey Thomas <geofft@ldpreload.com> Signed-off-by: Geoffrey Thomas <geofft@ldpreload.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Sven Van Asbroeck <thesven73@gmail.com> Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com> Co-developed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Gary Guo <gary@garyguo.net> Co-developed-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Co-developed-by: Maciej Falkowski <m.falkowski@samsung.com> Signed-off-by: Maciej Falkowski <m.falkowski@samsung.com> Co-developed-by: Wei Liu <wei.liu@kernel.org> Signed-off-by: Wei Liu <wei.liu@kernel.org> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
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