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,
Jarkko Sakkinen <jarkko@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 v6 06/23] rust: add `compiler_builtins` crate
Date: Sat, 7 May 2022 07:24:04 +0200 [thread overview]
Message-ID: <20220507052451.12890-7-ojeda@kernel.org> (raw)
In-Reply-To: <20220507052451.12890-1-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..80ca4c0dcd24
--- /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 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!("`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,
+});
--
2.35.3
next prev parent reply other threads:[~2022-05-07 5:27 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-07 5:23 [PATCH v6 00/23] Rust support Miguel Ojeda
2022-05-07 5:23 ` [PATCH v6 01/23] kallsyms: avoid hardcoding the buffer size Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 02/23] kallsyms: support "big" kernel symbols Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 03/23] kallsyms: increase maximum kernel symbol length to 512 Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 04/23] kunit: take `kunit_assert` as `const` Miguel Ojeda
2022-05-12 19:01 ` Brendan Higgins
2022-05-07 5:24 ` [PATCH v6 05/23] rust: add C helpers Miguel Ojeda
2022-05-07 5:24 ` Miguel Ojeda [this message]
2022-05-07 5:24 ` [PATCH v6 07/23] rust: import upstream `alloc` crate Miguel Ojeda
2022-05-07 9:23 ` Kees Cook
2022-05-07 9:33 ` Miguel Ojeda
2022-05-07 17:06 ` Kees Cook
2022-05-07 17:30 ` Linus Torvalds
2022-05-07 19:34 ` Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 08/23] rust: adapt `alloc` crate to the kernel Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 09/23] rust: add `build_error` crate Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 10/23] rust: add `macros` crate Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 11/23] rust: add `kernel` crate's `sync` module Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 12/23] rust: add `kernel` crate Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 13/23] rust: export generated symbols Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 14/23] vsprintf: add new `%pA` format specifier Miguel Ojeda
2022-05-07 8:19 ` Kees Cook
2022-05-07 9:35 ` Miguel Ojeda
2022-05-10 8:38 ` Petr Mladek
2022-05-10 10:45 ` Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 15/23] scripts: add `rustdoc_test_{builder,gen}.py` scripts Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 16/23] scripts: add `generate_rust_analyzer.py` scripts Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 17/23] scripts: decode_stacktrace: demangle Rust symbols Miguel Ojeda
2022-05-07 8:32 ` Kees Cook
2022-05-07 10:21 ` Miguel Ojeda
2022-05-07 17:09 ` Kees Cook
2022-05-07 5:24 ` [PATCH v6 18/23] docs: add Rust documentation Miguel Ojeda
2022-05-07 8:15 ` Kees Cook
2022-05-07 8:45 ` Miguel Ojeda
2022-05-09 4:02 ` Akira Yokosawa
2022-05-09 10:41 ` Miguel Ojeda
2022-05-09 14:56 ` Akira Yokosawa
2022-05-09 22:37 ` Jonathan Corbet
2022-05-10 11:57 ` Miguel Ojeda
2022-05-09 22:32 ` Jonathan Corbet
2022-05-10 3:14 ` Gaelan Steele
2022-05-10 5:53 ` Josh Triplett
2022-05-11 13:49 ` Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 19/23] Kbuild: add Rust support Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 20/23] samples: add Rust examples Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 21/23] MAINTAINERS: Rust Miguel Ojeda
2022-05-07 8:06 ` Kees Cook
2022-05-07 5:24 ` [PATCH v6 22/23] [RFC] drivers: gpio: PrimeCell PL061 in Rust Miguel Ojeda
2022-05-07 5:24 ` [PATCH v6 23/23] [RFC] drivers: android: Binder IPC " Miguel Ojeda
2022-05-07 7:55 ` Kees Cook
2022-05-07 8:13 ` Greg Kroah-Hartman
2022-05-09 17:52 ` Todd Kjos
2022-05-07 8:06 ` [PATCH v6 00/23] Rust support Kees Cook
2022-05-08 18:06 ` Matthew Wilcox
2022-05-09 9:39 ` Wei Liu
2022-05-07 9:29 ` David Gow
2022-05-07 15:03 ` Miguel Ojeda
2022-05-10 4:44 ` David Gow
2022-05-10 11:36 ` Miguel Ojeda
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220507052451.12890-7-ojeda@kernel.org \
--to=ojeda@kernel.org \
--cc=alex.gaynor@gmail.com \
--cc=gary@garyguo.net \
--cc=gregkh@linuxfoundation.org \
--cc=jarkko@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=rust-for-linux@vger.kernel.org \
--cc=thesven73@gmail.com \
--cc=torvalds@linux-foundation.org \
--cc=wedsonaf@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).