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ccb8ce5268
This commit allows building ARMv7 kernels with Rust support. The rust core library expects some __eabi_... functions that are not implemented in the kernel. Those functions are some float operations and __aeabi_uldivmod. For now those are implemented with define_panicking_intrinsics!. This is based on the code by Sven Van Asbroeck from the original rust branch and inspired by the AArch version by Jamie Cunliffe. I have tested the rust samples and a custom simple MMIO module on hardware (De1SoC FPGA + Arm A9 CPU). Tested-by: Rudraksha Gupta <guptarud@gmail.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Acked-by: Miguel Ojeda <ojeda@kernel.org> Tested-by: Miguel Ojeda <ojeda@kernel.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Christian Schrefl <chrisi.schrefl@gmail.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
101 lines
2.5 KiB
Rust
101 lines
2.5 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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//! Our own `compiler_builtins`.
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//!
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//! Rust provides [`compiler_builtins`] as a port of LLVM's [`compiler-rt`].
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//! Since we do not need the vast majority of them, we avoid the dependency
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//! by providing this file.
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//!
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//! At the moment, some builtins are required that should not be. For instance,
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//! [`core`] has 128-bit integers functionality which we should not be compiling
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//! in. We will work with upstream [`core`] to provide feature flags to disable
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//! the parts we do not need. For the moment, we define them to [`panic!`] at
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//! runtime for simplicity to catch mistakes, instead of performing surgery
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//! on `core.o`.
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//!
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//! In any case, all these symbols are weakened to ensure we do not override
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//! those that may be provided by the rest of the kernel.
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//!
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//! [`compiler_builtins`]: https://github.com/rust-lang/compiler-builtins
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//! [`compiler-rt`]: https://compiler-rt.llvm.org/
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#![allow(internal_features)]
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#![feature(compiler_builtins)]
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#![compiler_builtins]
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#![no_builtins]
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#![no_std]
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macro_rules! define_panicking_intrinsics(
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($reason: tt, { $($ident: ident, )* }) => {
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$(
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#[doc(hidden)]
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#[export_name = concat!("__rust", stringify!($ident))]
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pub extern "C" fn $ident() {
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panic!($reason);
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}
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)*
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}
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);
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define_panicking_intrinsics!("`f32` should not be used", {
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__addsf3,
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__eqsf2,
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__extendsfdf2,
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__gesf2,
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__lesf2,
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__ltsf2,
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__mulsf3,
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__nesf2,
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__truncdfsf2,
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__unordsf2,
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});
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define_panicking_intrinsics!("`f64` should not be used", {
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__adddf3,
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__eqdf2,
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__ledf2,
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__ltdf2,
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__muldf3,
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__unorddf2,
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});
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define_panicking_intrinsics!("`i128` should not be used", {
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__ashrti3,
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__muloti4,
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__multi3,
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});
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define_panicking_intrinsics!("`u128` should not be used", {
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__ashlti3,
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__lshrti3,
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__udivmodti4,
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__udivti3,
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__umodti3,
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});
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#[cfg(target_arch = "arm")]
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define_panicking_intrinsics!("`f32` should not be used", {
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__aeabi_fadd,
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__aeabi_fmul,
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__aeabi_fcmpeq,
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__aeabi_fcmple,
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__aeabi_fcmplt,
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__aeabi_fcmpun,
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});
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#[cfg(target_arch = "arm")]
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define_panicking_intrinsics!("`f64` should not be used", {
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__aeabi_dadd,
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__aeabi_dmul,
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__aeabi_dcmple,
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__aeabi_dcmplt,
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__aeabi_dcmpun,
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});
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#[cfg(target_arch = "arm")]
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define_panicking_intrinsics!("`u64` division/modulo should not be used", {
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__aeabi_uldivmod,
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});
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// NOTE: if you are adding a new intrinsic here, you should also add it to
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// `redirect-intrinsics` in `rust/Makefile`.
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