diff --git a/rust/Makefile b/rust/Makefile index f51aef988513..4b949559780f 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -36,6 +36,8 @@ always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o +always-$(subst y,$(CONFIG_RUST),$(CONFIG_JUMP_LABEL)) += kernel/arch_static_branch_asm.rs + # Avoids running `$(RUSTC)` for the sysroot when it may not be available. ifdef CONFIG_RUST @@ -466,4 +468,8 @@ $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \ $(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE +$(call if_changed_rule,rustc_library) +ifdef CONFIG_JUMP_LABEL +$(obj)/kernel.o: $(obj)/kernel/arch_static_branch_asm.rs +endif + endif # CONFIG_RUST diff --git a/rust/kernel/.gitignore b/rust/kernel/.gitignore new file mode 100644 index 000000000000..d082731007c6 --- /dev/null +++ b/rust/kernel/.gitignore @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +/arch_static_branch_asm.rs diff --git a/rust/kernel/arch_static_branch_asm.rs.S b/rust/kernel/arch_static_branch_asm.rs.S new file mode 100644 index 000000000000..2afb638708db --- /dev/null +++ b/rust/kernel/arch_static_branch_asm.rs.S @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include + +// Cut here. + +::kernel::concat_literals!(ARCH_STATIC_BRANCH_ASM("{symb} + {off} + {branch}", "{l_yes}")) diff --git a/rust/kernel/jump_label.rs b/rust/kernel/jump_label.rs index 7075302bf474..0875ee53a3b5 100644 --- a/rust/kernel/jump_label.rs +++ b/rust/kernel/jump_label.rs @@ -23,7 +23,51 @@ macro_rules! static_branch_unlikely { let _key: *const $keytyp = ::core::ptr::addr_of!($key); let _key: *const $crate::bindings::static_key = ::core::ptr::addr_of!((*_key).$field); - $crate::bindings::static_key_count(_key.cast_mut()) > 0 + #[cfg(not(CONFIG_JUMP_LABEL))] + { + $crate::bindings::static_key_count(_key) > 0 + } + + #[cfg(CONFIG_JUMP_LABEL)] + $crate::jump_label::arch_static_branch! { $key, $keytyp, $field, false } }}; } pub use static_branch_unlikely; + +/// Assert that the assembly block evaluates to a string literal. +#[cfg(CONFIG_JUMP_LABEL)] +const _: &str = include!(concat!( + env!("OBJTREE"), + "/rust/kernel/arch_static_branch_asm.rs" +)); + +#[macro_export] +#[doc(hidden)] +#[cfg(CONFIG_JUMP_LABEL)] +macro_rules! arch_static_branch { + ($key:path, $keytyp:ty, $field:ident, $branch:expr) => {'my_label: { + $crate::asm!( + include!(concat!(env!("OBJTREE"), "/rust/kernel/arch_static_branch_asm.rs")); + l_yes = label { + break 'my_label true; + }, + symb = sym $key, + off = const ::core::mem::offset_of!($keytyp, $field), + branch = const $crate::jump_label::bool_to_int($branch), + ); + + break 'my_label false; + }}; +} + +#[cfg(CONFIG_JUMP_LABEL)] +pub use arch_static_branch; + +/// A helper used by inline assembly to pass a boolean to as a `const` parameter. +/// +/// Using this function instead of a cast lets you assert that the input is a boolean, and not some +/// other type that can also be cast to an integer. +#[doc(hidden)] +pub const fn bool_to_int(b: bool) -> i32 { + b as i32 +} diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs index 3e2d49c8393b..4d38da2eb741 100644 --- a/rust/kernel/lib.rs +++ b/rust/kernel/lib.rs @@ -153,3 +153,38 @@ macro_rules! container_of { ptr.sub(offset) as *const $type }} } + +/// Helper for `.rs.S` files. +#[doc(hidden)] +#[macro_export] +macro_rules! concat_literals { + ($( $asm:literal )* ) => { + ::core::concat!($($asm),*) + }; +} + +/// Wrapper around `asm!` configured for use in the kernel. +/// +/// Uses a semicolon to avoid parsing ambiguities, even though this does not match native `asm!` +/// syntax. +// For x86, `asm!` uses intel syntax by default, but we want to use at&t syntax in the kernel. +#[cfg(any(target_arch = "x86", target_arch = "x86_64"))] +#[macro_export] +macro_rules! asm { + ($($asm:expr),* ; $($rest:tt)*) => { + ::core::arch::asm!( $($asm)*, options(att_syntax), $($rest)* ) + }; +} + +/// Wrapper around `asm!` configured for use in the kernel. +/// +/// Uses a semicolon to avoid parsing ambiguities, even though this does not match native `asm!` +/// syntax. +// For non-x86 arches we just pass through to `asm!`. +#[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))] +#[macro_export] +macro_rules! asm { + ($($asm:expr),* ; $($rest:tt)*) => { + ::core::arch::asm!( $($asm)*, $($rest)* ) + }; +} diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 8cf6e06e1a51..f889f79490d7 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -259,12 +259,13 @@ $(obj)/%.lst: $(obj)/%.c FORCE # Compile Rust sources (.rs) # --------------------------------------------------------------------------- -rust_allowed_features := arbitrary_self_types,new_uninit +rust_allowed_features := arbitrary_self_types,asm_const,asm_goto,new_uninit # `--out-dir` is required to avoid temporaries being created by `rustc` in the # current working directory, which may be not accessible in the out-of-tree # modules case. rust_common_cmd = \ + OBJTREE=$(abspath $(objtree)) \ RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \ -Zallow-features=$(rust_allowed_features) \ -Zcrate-attr=no_std \ @@ -314,6 +315,12 @@ quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ $(obj)/%.ll: $(obj)/%.rs FORCE +$(call if_changed_dep,rustc_ll_rs) +quiet_cmd_rustc_rs_rs_S = RSCPP $(quiet_modtag) $@ + cmd_rustc_rs_rs_S = $(CPP) $(c_flags) -xc -C -P $< | sed '1,/^\/\/ Cut here.$$/d' >$@ + +$(obj)/%.rs: $(obj)/%.rs.S FORCE + +$(call if_changed_dep,rustc_rs_rs_S) + # Compile assembler sources (.S) # ---------------------------------------------------------------------------