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-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, patches@lists.linux.dev,
"Jarkko Sakkinen" <jarkko@kernel.org>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Kees Cook" <keescook@chromium.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Wedson Almeida Filho" <wedsonaf@google.com>,
"Sven Van Asbroeck" <thesven73@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>
Subject: [PATCH v10 09/27] rust: add `compiler_builtins` crate
Date: Tue, 27 Sep 2022 15:14:40 +0200 [thread overview]
Message-ID: <20220927131518.30000-10-ojeda@kernel.org> (raw)
In-Reply-To: <20220927131518.30000-1-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.
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/compiler_builtins.rs | 63 +++++++++++++++++++++++++++++++++++++++
1 file changed, 63 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..f8f39a3e6855
--- /dev/null
+++ b/rust/compiler_builtins.rs
@@ -0,0 +1,63 @@
+// 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 128-bit integers 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!("`f32` should not be used", {
+ __eqsf2,
+ __gesf2,
+ __lesf2,
+ __nesf2,
+ __unordsf2,
+});
+
+define_panicking_intrinsics!("`f64` should not be used", {
+ __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,
+});
--
2.37.3
next prev parent reply other threads:[~2022-09-27 13:18 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-27 13:14 [PATCH v10 00/27] Rust support Miguel Ojeda
2022-09-27 13:14 ` [PATCH v10 01/27] kallsyms: use `ARRAY_SIZE` instead of hardcoded size Miguel Ojeda
2022-09-27 14:05 ` Geert Stappers
2022-09-27 14:51 ` Greg Kroah-Hartman
2022-09-28 14:58 ` Wei Liu
2022-09-27 13:14 ` [PATCH v10 02/27] kallsyms: avoid hardcoding buffer size Miguel Ojeda
2022-09-27 14:52 ` Greg Kroah-Hartman
2022-09-28 14:59 ` Wei Liu
2022-09-27 13:14 ` [PATCH v10 03/27] kallsyms: add static relationship between `KSYM_NAME_LEN{,_BUFFER}` Miguel Ojeda
2022-09-27 14:54 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 04/27] kallsyms: support "big" kernel symbols Miguel Ojeda
2022-09-27 14:55 ` Greg Kroah-Hartman
2022-10-29 17:41 ` Guenter Roeck
2022-10-29 18:23 ` Guenter Roeck
2022-09-27 13:14 ` [PATCH v10 05/27] kallsyms: increase maximum kernel symbol length to 512 Miguel Ojeda
2022-09-27 14:56 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 06/27] rust: add C helpers Miguel Ojeda
2022-09-27 14:59 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 07/27] rust: import upstream `alloc` crate Miguel Ojeda
2022-09-27 13:14 ` [PATCH v10 08/27] rust: adapt `alloc` crate to the kernel Miguel Ojeda
2022-09-27 13:51 ` Konstantin Shelekhin
2022-09-27 14:06 ` Miguel Ojeda
2022-09-27 15:13 ` Konstantin Shelekhin
2022-09-27 16:01 ` Miguel Ojeda
2022-09-27 15:35 ` Greg Kroah-Hartman
2022-09-28 15:10 ` Wei Liu
2022-09-28 15:25 ` Miguel Ojeda
2022-09-28 15:27 ` Wei Liu
2022-09-27 13:14 ` Miguel Ojeda [this message]
2022-09-28 13:25 ` [PATCH v10 09/27] rust: add `compiler_builtins` crate Wei Liu
2022-09-27 13:14 ` [PATCH v10 10/27] rust: add `macros` crate Miguel Ojeda
2022-09-27 13:48 ` Konstantin Shelekhin
2022-09-27 13:59 ` Geert Stappers
2022-09-27 14:01 ` Miguel Ojeda
2022-09-28 15:29 ` Wei Liu
2022-09-28 16:36 ` Miguel Ojeda
2022-09-27 13:14 ` [PATCH v10 11/27] rust: add `bindings` crate Miguel Ojeda
2022-09-27 15:23 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 12/27] rust: add `kernel` crate Miguel Ojeda
2022-09-27 15:22 ` Greg Kroah-Hartman
2022-09-27 15:36 ` Alex Gaynor
2022-09-27 15:43 ` Miguel Ojeda
2022-09-27 13:14 ` [PATCH v10 13/27] rust: export generated symbols Miguel Ojeda
2022-09-27 15:32 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 14/27] vsprintf: add new `%pA` format specifier Miguel Ojeda
2022-09-27 15:00 ` Greg Kroah-Hartman
2022-09-28 10:09 ` Sergey Senozhatsky
2022-09-27 13:14 ` [PATCH v10 15/27] scripts: checkpatch: diagnose uses of `%pA` in the C side as errors Miguel Ojeda
2022-09-27 15:03 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 16/27] scripts: checkpatch: enable language-independent checks for Rust Miguel Ojeda
2022-09-27 15:02 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 17/27] scripts: decode_stacktrace: demangle Rust symbols Miguel Ojeda
2022-09-27 15:02 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 18/27] scripts: add `generate_rust_analyzer.py` Miguel Ojeda
2022-09-27 13:14 ` [PATCH v10 19/27] scripts: add `generate_rust_target.rs` Miguel Ojeda
2022-09-27 13:14 ` [PATCH v10 20/27] scripts: add `rust_is_available.sh` Miguel Ojeda
2022-09-28 14:49 ` Wei Liu
2022-09-27 13:14 ` [PATCH v10 21/27] scripts: add `is_rust_module.sh` Miguel Ojeda
2022-09-27 15:26 ` Greg Kroah-Hartman
2022-09-27 13:14 ` [PATCH v10 22/27] rust: add `.rustfmt.toml` Miguel Ojeda
2022-09-28 13:30 ` Wei Liu
2022-09-27 13:14 ` [PATCH v10 23/27] Kbuild: add Rust support Miguel Ojeda
2022-09-27 15:30 ` Greg Kroah-Hartman
2022-09-28 14:56 ` Wei Liu
2022-09-27 13:14 ` [PATCH v10 24/27] docs: add Rust documentation Miguel Ojeda
2022-09-27 13:14 ` [PATCH v10 25/27] x86: enable initial Rust support Miguel Ojeda
2022-09-27 15:31 ` Greg Kroah-Hartman
2022-09-28 14:32 ` Wei Liu
2022-09-28 16:39 ` Miguel Ojeda
2022-10-07 17:17 ` Peter Zijlstra
2022-10-10 23:15 ` Sami Tolvanen
2022-10-11 8:04 ` Peter Zijlstra
2022-10-14 17:23 ` Miguel Ojeda
2022-10-14 17:25 ` Boqun Feng
2022-10-14 18:05 ` Miguel Ojeda
2022-10-14 18:34 ` Sami Tolvanen
2022-10-14 20:39 ` Miguel Ojeda
2023-10-09 16:00 ` Matthew Maurer
2023-10-09 16:31 ` Miguel Ojeda
2023-10-09 17:37 ` Greg Kroah-Hartman
2023-10-12 10:47 ` Peter Zijlstra
2023-10-12 17:50 ` Sami Tolvanen
2023-10-12 18:31 ` Kees Cook
2023-10-12 22:26 ` Ramon de C Valle
[not found] ` <CAOcBZOTed1a1yOimdUN9yuuysZ1h6VXa57+5fLAE99SZxCwBMQ@mail.gmail.com>
2023-10-13 7:50 ` Peter Zijlstra
2023-10-13 12:17 ` Ramon de C Valle
2023-10-13 18:54 ` Linus Torvalds
2023-10-13 19:00 ` H. Peter Anvin
2023-10-13 19:22 ` Linus Torvalds
2023-10-14 20:25 ` comex
2023-10-14 20:50 ` H. Peter Anvin
2022-09-27 13:14 ` [PATCH v10 26/27] samples: add first Rust examples Miguel Ojeda
2022-09-27 15:25 ` Greg Kroah-Hartman
2022-09-28 14:23 ` Wei Liu
2022-09-27 13:14 ` [PATCH v10 27/27] MAINTAINERS: Rust Miguel Ojeda
2022-09-27 14:11 ` Geert Stappers
2022-09-27 15:19 ` Kees Cook
2022-09-27 15:34 ` Greg Kroah-Hartman
2022-09-27 15:53 ` Miguel Ojeda
2022-09-27 16:39 ` Greg Kroah-Hartman
2022-09-27 18:14 ` Kees Cook
2022-09-28 0:11 ` Kees Cook
2022-09-28 11:57 ` Wedson Almeida Filho
2022-09-28 12:22 ` Miguel Ojeda
2022-09-27 16:00 ` Wedson Almeida Filho
2022-09-27 16:38 ` Greg Kroah-Hartman
2022-09-28 15:06 ` [PATCH v10 00/27] Rust support Wei Liu
2022-09-28 15:34 ` Miguel Ojeda
2022-09-28 15:40 ` Wei Liu
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