From: ojeda@kernel.org To: Linus Torvalds <torvalds@linux-foundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: rust-for-linux@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Miguel Ojeda <ojeda@kernel.org>, Alex Gaynor <alex.gaynor@gmail.com>, Geoffrey Thomas <geofft@ldpreload.com>, Finn Behrens <me@kloenk.de>, Adam Bratschi-Kaye <ark.email@gmail.com>, Wedson Almeida Filho <wedsonaf@google.com> Subject: [PATCH 05/13] Rust: Compiler builtins crate Date: Wed, 14 Apr 2021 20:45:56 +0200 [thread overview] Message-ID: <20210414184604.23473-6-ojeda@kernel.org> (raw) In-Reply-To: <20210414184604.23473-1-ojeda@kernel.org> From: Miguel Ojeda <ojeda@kernel.org> 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. We also need a helpers C source file to contain some forwarders to C macros and inlined functions. For the moment, we only need it to call the `BUG()` macro, but we will be adding more later. This also allows us to build `core` from Rust's standard library. 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: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org> --- rust/Makefile | 3 + rust/compiler_builtins.rs | 146 ++++++++++++++++++++++++++++++++++++++ rust/helpers.c | 8 +++ 3 files changed, 157 insertions(+) create mode 100644 rust/compiler_builtins.rs create mode 100644 rust/helpers.c diff --git a/rust/Makefile b/rust/Makefile index ba4b13e4fc7f..5b96462b4fef 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -1,5 +1,8 @@ # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_RUST) += core.o compiler_builtins.o helpers.o +extra-$(CONFIG_RUST) += exports_core_generated.h + RUSTDOC = rustdoc quiet_cmd_rustdoc = RUSTDOC $< diff --git a/rust/compiler_builtins.rs b/rust/compiler_builtins.rs new file mode 100644 index 000000000000..01f2d905e15f --- /dev/null +++ b/rust/compiler_builtins.rs @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Our own `compiler_builtins`. +//! +//! Rust provides [`compiler_builtins`] as a port of LLVM's [`compiler-rt`]. +//! Since we do not need the vast majority of them, we avoid the dependency +//! by providing this file. +//! +//! At the moment, some builtins are required that should not be. For instance, +//! [`core`] has floating-point functionality which we should not be compiling +//! in. For the moment, we define them to [`panic!`] at runtime for simplicity. +//! These are actually a superset of the ones we actually need to define, +//! but it seems simpler to ban entire categories at once. In the future, +//! we might be able to remove all this by providing our own custom [`core`] +//! etc., or perhaps [`core`] itself might provide `cfg` options to disable +//! enough functionality to avoid requiring some of these. +//! +//! In any case, all these symbols are weakened to ensure we do not override +//! those that may be provided by the rest of the kernel. +//! +//! [`compiler_builtins`]: https://github.com/rust-lang/compiler-builtins +//! [`compiler-rt`]: https://compiler-rt.llvm.org/ + +#![feature(compiler_builtins)] +#![compiler_builtins] +#![no_builtins] +#![no_std] +#![deny(clippy::complexity)] +#![deny(clippy::correctness)] +#![deny(clippy::perf)] +#![deny(clippy::style)] + +macro_rules! define_panicking_intrinsics( + ($reason: tt, { $($ident: ident, )* }) => { + $( + #[doc(hidden)] + #[no_mangle] + pub extern "C" fn $ident() { + panic!($reason); + } + )* + } +); + +define_panicking_intrinsics!("non-inline stack probes should not be used", { + __rust_probestack, +}); + +define_panicking_intrinsics!("`f32` should not be used", { + __addsf3, + __addsf3vfp, + __divsf3, + __divsf3vfp, + __eqsf2, + __eqsf2vfp, + __fixsfdi, + __fixsfsi, + __fixsfti, + __fixunssfdi, + __fixunssfsi, + __fixunssfti, + __floatdisf, + __floatsisf, + __floattisf, + __floatundisf, + __floatunsisf, + __floatuntisf, + __gesf2, + __gesf2vfp, + __gtsf2, + __gtsf2vfp, + __lesf2, + __lesf2vfp, + __ltsf2, + __ltsf2vfp, + __mulsf3, + __mulsf3vfp, + __nesf2, + __nesf2vfp, + __powisf2, + __subsf3, + __subsf3vfp, + __unordsf2, +}); + +define_panicking_intrinsics!("`f64` should not be used", { + __adddf3, + __adddf3vfp, + __divdf3, + __divdf3vfp, + __eqdf2, + __eqdf2vfp, + __fixdfdi, + __fixdfsi, + __fixdfti, + __fixunsdfdi, + __fixunsdfsi, + __fixunsdfti, + __floatdidf, + __floatsidf, + __floattidf, + __floatundidf, + __floatunsidf, + __floatuntidf, + __gedf2, + __gedf2vfp, + __gtdf2, + __gtdf2vfp, + __ledf2, + __ledf2vfp, + __ltdf2, + __ltdf2vfp, + __muldf3, + __muldf3vfp, + __nedf2, + __nedf2vfp, + __powidf2, + __subdf3, + __subdf3vfp, + __unorddf2, +}); + +define_panicking_intrinsics!("`i128` should not be used", { + __ashrti3, + __muloti4, + __multi3, +}); + +define_panicking_intrinsics!("`u128` should not be used", { + __ashlti3, + __lshrti3, + __udivmodti4, + __udivti3, + __umodti3, +}); + +extern "C" { + fn rust_helper_BUG() -> !; +} + +#[panic_handler] +fn panic(_info: &core::panic::PanicInfo) -> ! { + unsafe { + rust_helper_BUG(); + } +} diff --git a/rust/helpers.c b/rust/helpers.c new file mode 100644 index 000000000000..5c2346dd379b --- /dev/null +++ b/rust/helpers.c @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/bug.h> + +void rust_helper_BUG(void) +{ + BUG(); +} -- 2.17.1
next prev parent reply other threads:[~2021-04-14 18:47 UTC|newest] Thread overview: 197+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-14 18:45 [PATCH 00/13] [RFC] Rust support ojeda 2021-04-14 18:45 ` [PATCH 01/13] kallsyms: Support "big" kernel symbols (2-byte lengths) ojeda 2021-04-14 19:44 ` Matthew Wilcox 2021-04-14 19:59 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 02/13] kallsyms: Increase maximum kernel symbol length to 512 ojeda 2021-04-14 23:48 ` Nick Desaulniers 2021-04-14 18:45 ` [PATCH 03/13] Makefile: Generate CLANG_FLAGS even in GCC builds ojeda 2021-04-14 18:59 ` Nathan Chancellor 2021-04-15 10:18 ` Miguel Ojeda 2021-04-14 23:46 ` Nick Desaulniers 2021-04-15 0:47 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 04/13] Kbuild: Rust support ojeda 2021-04-14 23:19 ` Nick Desaulniers 2021-04-15 0:43 ` Miguel Ojeda 2021-04-15 18:03 ` Nick Desaulniers 2021-04-16 12:23 ` Miguel Ojeda 2021-04-17 19:35 ` Masahiro Yamada 2021-04-16 13:38 ` Peter Zijlstra 2021-04-16 17:05 ` Linus Torvalds 2021-04-16 17:47 ` Miguel Ojeda 2021-04-16 18:09 ` Al Viro 2021-04-16 18:57 ` Miguel Ojeda 2021-04-16 20:22 ` Willy Tarreau 2021-04-16 20:34 ` Connor Kuehl 2021-04-16 20:58 ` Willy Tarreau 2021-04-16 21:39 ` Miguel Ojeda 2021-04-16 22:04 ` Willy Tarreau 2021-04-16 22:45 ` Al Viro 2021-04-16 23:46 ` Miguel Ojeda 2021-04-17 4:24 ` Willy Tarreau 2021-04-17 15:38 ` Miguel Ojeda 2021-04-16 21:19 ` Miguel Ojeda 2021-04-16 17:34 ` Miguel Ojeda 2021-04-19 19:58 ` David Sterba 2021-04-19 20:17 ` Matthew Wilcox 2021-04-19 21:03 ` Miguel Ojeda 2021-04-19 20:54 ` Miguel Ojeda 2021-04-14 18:45 ` ojeda [this message] 2021-04-14 19:19 ` [PATCH 05/13] Rust: Compiler builtins crate Linus Torvalds 2021-04-14 19:34 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 06/13] Rust: Module crate ojeda 2021-04-14 18:45 ` [PATCH 07/13] Rust: Kernel crate ojeda 2021-04-14 19:31 ` Linus Torvalds 2021-04-14 19:50 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 08/13] Rust: Export generated symbols ojeda 2021-04-14 18:46 ` [PATCH 09/13] Samples: Rust examples ojeda 2021-04-14 19:34 ` Linus Torvalds 2021-04-14 19:42 ` Miguel Ojeda 2021-04-14 19:49 ` Matthew Wilcox 2021-04-16 11:46 ` Andrej Shadura 2021-04-14 23:24 ` Nick Desaulniers 2021-04-15 7:10 ` Greg Kroah-Hartman 2021-04-15 7:39 ` Nick Desaulniers 2021-04-15 12:42 ` Miguel Ojeda 2021-04-16 13:07 ` Sven Van Asbroeck 2021-04-16 13:20 ` Greg Kroah-Hartman 2021-04-14 18:46 ` [PATCH 10/13] Documentation: Rust general information ojeda 2021-04-14 22:17 ` Nick Desaulniers 2021-04-14 23:34 ` Miguel Ojeda 2021-04-14 18:46 ` [PATCH 11/13] MAINTAINERS: Rust ojeda 2021-04-14 21:55 ` Nick Desaulniers 2021-04-14 22:02 ` Miguel Ojeda 2021-04-14 22:36 ` Nick Desaulniers 2021-04-14 18:46 ` [PATCH 12/13] Rust: add abstractions for Binder (WIP) ojeda 2021-04-14 18:46 ` [PATCH 13/13] Android: Binder IPC in Rust (WIP) ojeda 2021-04-14 19:44 ` [PATCH 00/13] [RFC] Rust support Linus Torvalds 2021-04-14 20:20 ` Miguel Ojeda 2021-04-15 1:38 ` Kees Cook 2021-04-15 8:26 ` David Laight 2021-04-15 18:08 ` Kees Cook 2021-04-15 12:39 ` Miguel Ojeda 2021-04-14 20:09 ` Matthew Wilcox 2021-04-14 20:21 ` Linus Torvalds 2021-04-14 20:35 ` Josh Triplett 2021-04-14 22:08 ` David Laight 2021-04-14 20:29 ` Miguel Ojeda 2021-04-18 15:31 ` Wedson Almeida Filho 2021-04-15 0:22 ` Nick Desaulniers 2021-04-15 10:05 ` Miguel Ojeda 2021-04-15 18:58 ` Peter Zijlstra 2021-04-16 2:22 ` Wedson Almeida Filho 2021-04-16 4:25 ` Al Viro 2021-04-16 5:02 ` Wedson Almeida Filho 2021-04-16 5:39 ` Paul Zimmerman 2021-04-16 7:46 ` Peter Zijlstra 2021-04-16 7:09 ` Peter Zijlstra 2021-04-17 5:23 ` comex 2021-04-17 12:46 ` David Laight 2021-04-17 14:51 ` Paolo Bonzini 2021-04-19 7:32 ` Peter Zijlstra 2021-04-19 7:53 ` Paolo Bonzini 2021-04-19 8:26 ` Peter Zijlstra 2021-04-19 8:35 ` Peter Zijlstra 2021-04-19 9:02 ` Paolo Bonzini 2021-04-19 9:36 ` Peter Zijlstra 2021-04-19 9:40 ` Paolo Bonzini 2021-04-19 11:01 ` Will Deacon 2021-04-19 17:14 ` Linus Torvalds 2021-04-19 18:38 ` Paolo Bonzini 2021-04-19 18:50 ` Linus Torvalds 2021-04-22 10:03 ` Linus Walleij 2021-04-22 14:09 ` David Laight 2021-04-22 15:24 ` Wedson Almeida Filho 2021-04-26 0:18 ` Linus Walleij 2021-04-26 14:26 ` Miguel Ojeda 2021-04-26 14:40 ` Wedson Almeida Filho 2021-04-26 16:03 ` Miguel Ojeda 2021-04-27 10:54 ` Linus Walleij 2021-04-27 11:13 ` Robin Randhawa 2021-04-29 1:52 ` Wedson Almeida Filho 2021-04-26 18:01 ` Miguel Ojeda 2021-04-22 21:28 ` Miguel Ojeda 2021-04-26 0:31 ` Linus Walleij 2021-04-26 18:18 ` Miguel Ojeda 2021-04-27 11:13 ` Linus Walleij 2021-04-28 2:51 ` Kyle Strand 2021-04-28 3:10 ` Miguel Ojeda 2021-05-04 21:21 ` Linus Walleij 2021-05-04 23:30 ` Miguel Ojeda 2021-05-05 11:34 ` Linus Walleij 2021-05-05 14:17 ` Miguel Ojeda 2021-05-05 15:13 ` Enrico Weigelt, metux IT consult 2021-05-06 12:47 ` Linus Walleij 2021-05-07 18:23 ` Miguel Ojeda 2021-04-16 4:27 ` Boqun Feng 2021-04-16 6:04 ` Nick Desaulniers 2021-04-16 18:47 ` Paul E. McKenney 2021-04-19 20:35 ` Nick Desaulniers 2021-04-19 21:37 ` Paul E. McKenney 2021-04-19 22:03 ` Miguel Ojeda 2021-04-16 20:48 ` Josh Triplett 2021-04-16 8:16 ` Michal Kubecek 2021-04-16 9:29 ` Willy Tarreau 2021-04-16 11:24 ` Peter Zijlstra 2021-04-16 13:07 ` Wedson Almeida Filho 2021-04-16 14:19 ` Peter Zijlstra 2021-04-16 15:04 ` Miguel Ojeda 2021-04-16 15:43 ` Peter Zijlstra 2021-04-16 16:21 ` Miguel Ojeda 2021-04-16 15:33 ` Wedson Almeida Filho 2021-04-16 16:14 ` Willy Tarreau 2021-04-16 17:10 ` Miguel Ojeda 2021-04-16 17:18 ` Peter Zijlstra 2021-04-16 18:08 ` Matthew Wilcox 2021-04-17 11:17 ` Peter Zijlstra 2021-04-17 11:46 ` Willy Tarreau 2021-04-17 14:24 ` Peter Zijlstra 2021-04-17 14:36 ` Willy Tarreau 2021-04-17 13:46 ` David Laight 2021-04-16 17:37 ` Willy Tarreau 2021-04-16 17:46 ` Connor Kuehl 2021-04-20 0:24 ` Nick Desaulniers 2021-04-20 3:47 ` Willy Tarreau 2021-04-20 5:56 ` Greg Kroah-Hartman 2021-04-20 6:16 ` Willy Tarreau 2021-04-29 15:38 ` peter enderborg 2021-04-17 13:53 ` Wedson Almeida Filho 2021-04-17 14:21 ` Willy Tarreau 2021-04-17 15:23 ` Miguel Ojeda 2021-04-18 15:51 ` Wedson Almeida Filho 2021-04-17 12:41 ` David Laight 2021-04-17 13:01 ` Wedson Almeida Filho 2021-04-16 15:03 ` Matthew Wilcox 2021-04-17 13:29 ` Wedson Almeida Filho 2021-04-16 15:58 ` Theodore Ts'o 2021-04-16 16:21 ` Wedson Almeida Filho 2021-04-17 15:11 ` Paolo Bonzini 2021-04-16 14:21 ` Miguel Ojeda 2021-04-17 20:42 ` Richard Weinberger 2021-04-28 18:34 ` Mariusz Ceier 2021-04-28 20:25 ` Nick Desaulniers 2021-04-28 21:21 ` David Laight 2021-04-29 11:14 ` Kajetan Puchalski 2021-04-29 11:25 ` Kajetan Puchalski 2021-04-29 14:06 ` Mariusz Ceier 2021-04-29 14:13 ` Sven Van Asbroeck 2021-04-29 14:26 ` Willy Tarreau 2021-04-29 15:06 ` Al Viro 2021-04-29 16:09 ` Mariusz Ceier 2021-04-30 6:39 ` Thomas Schoebel-Theuer 2021-04-30 8:30 ` David Laight 2021-05-05 13:58 ` Enrico Weigelt, metux IT consult 2021-05-05 14:41 ` Miguel Ojeda 2022-06-20 15:11 ` Olliver Schinagl 2022-06-27 17:44 ` Miguel Ojeda 2022-07-18 6:56 ` Olliver Schinagl 2022-07-20 19:23 ` Miguel Ojeda 2022-07-20 20:21 ` Nicolas Pitre 2022-07-27 7:47 ` Olliver Schinagl 2022-07-27 13:32 ` Nicolas Pitre 2022-07-27 8:05 ` Olliver Schinagl 2022-07-28 10:21 ` Gary Guo 2022-07-28 12:09 ` Greg Kroah-Hartman 2022-07-28 12:28 ` Gary Guo 2022-07-28 20:45 ` Olliver Schinagl 2022-07-29 8:04 ` Greg Kroah-Hartman 2022-07-28 20:43 ` Olliver Schinagl
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