From: Miguel Ojeda <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>, Wedson Almeida Filho <wedsonaf@google.com>, Sven Van Asbroeck <thesven73@gmail.com>, Gary Guo <gary@garyguo.net> Subject: [PATCH v3 05/19] rust: add `compiler_builtins` crate Date: Mon, 17 Jan 2022 06:33:35 +0100 [thread overview] Message-ID: <20220117053349.6804-6-ojeda@kernel.org> (raw) In-Reply-To: <20220117053349.6804-1-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. 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/compiler_builtins.rs | 57 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 rust/compiler_builtins.rs diff --git a/rust/compiler_builtins.rs b/rust/compiler_builtins.rs new file mode 100644 index 000000000000..a5a0be72591b --- /dev/null +++ b/rust/compiler_builtins.rs @@ -0,0 +1,57 @@ +// 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. We will work with upstream [`core`] to provide feature flags to disable +//! the parts we do not need. For the moment, we define them to [`panic!`] at +//! runtime for simplicity to catch mistakes, instead of performing surgery +//! on `core.o`. +//! +//! 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] + +macro_rules! define_panicking_intrinsics( + ($reason: tt, { $($ident: ident, )* }) => { + $( + #[doc(hidden)] + #[no_mangle] + pub extern "C" fn $ident() { + panic!($reason); + } + )* + } +); + +define_panicking_intrinsics!("`i128` should not be used", { + __ashrti3, + __muloti4, + __multi3, +}); + +define_panicking_intrinsics!("`u128` should not be used", { + __ashlti3, + __lshrti3, + __udivmodti4, + __udivti3, + __umodti3, +}); + +#[cfg(target_arch = "arm")] +define_panicking_intrinsics!("`u64` division/modulo should not be used", { + __aeabi_uldivmod, + __mulodi4, +}); -- 2.34.1
next prev parent reply other threads:[~2022-01-17 5:34 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-01-17 5:33 [PATCH v3 00/19] Rust support Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 01/19] kallsyms: support "big" kernel symbols Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 02/19] kallsyms: increase maximum kernel symbol length to 512 Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 03/19] kallsyms: use the correct buffer size for symbols Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 04/19] rust: add C helpers Miguel Ojeda 2022-01-17 5:33 ` Miguel Ojeda [this message] 2022-01-17 5:33 ` [PATCH v3 07/19] rust: add `build_error` crate Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 08/19] rust: add `macros` crate Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 10/19] rust: export generated symbols Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 11/19] vsprintf: add new `%pA` format specifier Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 12/19] scripts: add `generate_rust_analyzer.py` Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 13/19] scripts: decode_stacktrace: demangle Rust symbols Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 14/19] docs: add Rust documentation Miguel Ojeda 2022-01-18 22:33 ` Jonathan Corbet 2022-01-19 13:58 ` Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 15/19] Kbuild: add Rust support Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 16/19] samples: add Rust examples Miguel Ojeda 2022-01-17 5:33 ` [PATCH v3 17/19] MAINTAINERS: Rust Miguel Ojeda 2022-01-17 5:33 ` [RFC PATCH v3 18/19] drivers: gpio: PrimeCell PL061 in Rust Miguel Ojeda
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