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This simplifies onboarding, it is smaller, faster to compile and it is one less dependency to worry about. It also simplifies the build system a tiny bit since now everything uses the 2018 edition. Fixes #69. Signed-off-by: Miguel Ojeda <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,128 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
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| //! Our `compiler_builtins`. | ||
| //! | ||
| //! Rust provides `compiler_builtins` as a port of LLVM's `compiler-rt`. | ||
| //! Since we don't need the vast majority of them, we avoid the dependency | ||
| //! by providing this file. | ||
| //! | ||
| //! At the moment, some builtins are required that shouldn't be. For instance, | ||
| //! `core` has floating-point functionality which we shouldn't 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 don't override | ||
| //! those that may be provided by the rest of the kernel. | ||
| #![feature(compiler_builtins)] | ||
| #![compiler_builtins] | ||
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| #![no_builtins] | ||
| #![no_std] | ||
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| macro_rules! define_panicking_intrinsics( | ||
| ($reason: tt, { $($ident: ident, )* }) => { | ||
| $( | ||
| #[no_mangle] | ||
| pub extern "C" fn $ident() { | ||
| panic!($reason); | ||
| } | ||
| )* | ||
| } | ||
| ); | ||
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| define_panicking_intrinsics!("non-inline stack probes should not be used", { | ||
| __rust_probestack, | ||
| }); | ||
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|
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| 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, | ||
| }); | ||
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|
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| 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, | ||
| }); | ||
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| define_panicking_intrinsics!("`i128` should not be used", { | ||
| __ashrti3, | ||
| __muloti4, | ||
| __multi3, | ||
| }); | ||
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| define_panicking_intrinsics!("`u128` should not be used", { | ||
| __ashlti3, | ||
| __lshrti3, | ||
| __udivmodti4, | ||
| __udivti3, | ||
| __umodti3, | ||
| }); |
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