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Diffstat (limited to 'vendor/portable-atomic/src/gen/utils.rs')
| -rw-r--r-- | vendor/portable-atomic/src/gen/utils.rs | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/vendor/portable-atomic/src/gen/utils.rs b/vendor/portable-atomic/src/gen/utils.rs deleted file mode 100644 index 61f6c99..0000000 --- a/vendor/portable-atomic/src/gen/utils.rs +++ /dev/null @@ -1,147 +0,0 @@ -// SPDX-License-Identifier: Apache-2.0 OR MIT -// This file is @generated by target_spec.sh. -// It is not intended for manual editing. - -#![allow(unused_macros)] - -// On AArch64, the base register of load/store/atomic instructions must be 64-bit. -// Passing a 32-bit value to `in(reg)` on AArch64 results in the upper bits -// having an undefined value, but to work correctly with ILP32 ABI, the upper -// bits must be zero, which is handled here by casting to u64. Another way to -// handle this is to pass it as a pointer and clear the upper bits inside asm, -// but it is easier to overlook than cast, which can catch overlooks by -// asm_sub_register lint. -// See also https://github.com/ARM-software/abi-aa/blob/2023Q1/aapcs64/aapcs64.rst#57pointers -// -// Except for x86_64, which can use 32-bit registers in the destination operand -// (on x86_64, we use the ptr_modifier macro to handle this), we need to do the -// same for ILP32 ABI on other 64-bit architectures. (At least, as far as I can -// see from the assembly generated by LLVM, this is also required for MIPS64 N32 -// ABI. I don't know about the RISC-V s64ilp32 ABI for which a patch was -// recently submitted to the kernel, but in any case, this should be a safe -// default for such ABIs). -// -// Known architectures that have such ABI are x86_64 (X32), aarch64 (ILP32), -// mips64 (N32), and riscv64 (s64ilp32, not merged yet though). (As of -// 2023-06-05, only the former two are supported by rustc.) However, we list all -// known 64-bit architectures because similar ABIs may exist or future added for -// other architectures. -#[cfg(all( - target_pointer_width = "32", - any( - target_arch = "aarch64", - target_arch = "bpf", - target_arch = "loongarch64", - target_arch = "mips64", - target_arch = "mips64r6", - target_arch = "nvptx64", - target_arch = "powerpc64", - target_arch = "riscv64", - target_arch = "s390x", - target_arch = "sparc64", - target_arch = "wasm64", - target_arch = "x86_64", - ), -))] -macro_rules! ptr_reg { - ($ptr:ident) => {{ - let _: *const _ = $ptr; // ensure $ptr is a pointer (*mut _ or *const _) - #[cfg(not(portable_atomic_no_asm_maybe_uninit))] - #[allow(clippy::ptr_as_ptr)] - { - // If we cast to u64 here, the provenance will be lost, - // so we convert to MaybeUninit<u64> via zero extend helper. - crate::utils::zero_extend64_ptr($ptr as *mut ()) - } - #[cfg(portable_atomic_no_asm_maybe_uninit)] - { - // Use cast on old rustc because it does not support MaybeUninit - // registers. This is still permissive-provenance compatible and - // is sound. - $ptr as u64 - } - }}; -} -#[cfg(not(all( - target_pointer_width = "32", - any( - target_arch = "aarch64", - target_arch = "bpf", - target_arch = "loongarch64", - target_arch = "mips64", - target_arch = "mips64r6", - target_arch = "nvptx64", - target_arch = "powerpc64", - target_arch = "riscv64", - target_arch = "s390x", - target_arch = "sparc64", - target_arch = "wasm64", - target_arch = "x86_64", - ), -)))] -macro_rules! ptr_reg { - ($ptr:ident) => {{ - let _: *const _ = $ptr; // ensure $ptr is a pointer (*mut _ or *const _) - $ptr // cast is unnecessary here. - }}; -} - -// Some 64-bit architectures have ABI with 32-bit pointer width (e.g., x86_64 X32 ABI, -// AArch64 ILP32 ABI, MIPS64 N32 ABI). On those targets, AtomicU64 is available -// and fast, so use it to implement normal sequence lock. -// -// See ptr_reg macro for the reason why all known 64-bit architectures are listed. -#[cfg(feature = "fallback")] -#[cfg(any( - not(any(target_pointer_width = "16", target_pointer_width = "32")), // i.e., 64-bit or greater - target_arch = "aarch64", - target_arch = "bpf", - target_arch = "loongarch64", - target_arch = "mips64", - target_arch = "mips64r6", - target_arch = "nvptx64", - target_arch = "powerpc64", - target_arch = "riscv64", - target_arch = "s390x", - target_arch = "sparc64", - target_arch = "wasm64", - target_arch = "x86_64", -))] -#[macro_use] -mod fast_atomic_64_macros { - macro_rules! cfg_has_fast_atomic_64 { - ($($tt:tt)*) => { - $($tt)* - }; - } - macro_rules! cfg_no_fast_atomic_64 { - ($($tt:tt)*) => {}; - } -} -#[cfg(feature = "fallback")] -#[cfg(not(any( - not(any(target_pointer_width = "16", target_pointer_width = "32")), // i.e., 64-bit or greater - target_arch = "aarch64", - target_arch = "bpf", - target_arch = "loongarch64", - target_arch = "mips64", - target_arch = "mips64r6", - target_arch = "nvptx64", - target_arch = "powerpc64", - target_arch = "riscv64", - target_arch = "s390x", - target_arch = "sparc64", - target_arch = "wasm64", - target_arch = "x86_64", -)))] -#[macro_use] -mod fast_atomic_64_macros { - macro_rules! cfg_has_fast_atomic_64 { - ($($tt:tt)*) => {}; - } - macro_rules! cfg_no_fast_atomic_64 { - ($($tt:tt)*) => { - $($tt)* - }; - } -} |