| //! ARM C Language Extensions (ACLE) |
| //! |
| //! # Developer notes |
| //! |
| //! Below is a list of built-in targets that are representative of the different ARM |
| //! architectures; the list includes the `target_feature`s they possess. |
| //! |
| //! - `armv4t-unknown-linux-gnueabi` - **ARMv4** - `+v4t` |
| //! - `armv5te-unknown-linux-gnueabi` - **ARMv5TE** - `+v4t +v5te` |
| //! - `arm-unknown-linux-gnueabi` - **ARMv6** - `+v4t +v5te +v6` |
| //! - `thumbv6m-none-eabi` - **ARMv6-M** - `+v4t +v5te +v6 +thumb-mode +mclass` |
| //! - `armv7-unknown-linux-gnueabihf` - **ARMv7-A** - `+v4t +v5te +v6 +v6k +v6t2 +v7 +dsp +thumb2 +aclass` |
| //! - `armv7r-none-eabi` - **ARMv7-R** - `+v4t +v5te +v6 +v6k +v6t2 +v7 +dsp +thumb2 +rclass` |
| //! - `thumbv7m-none-eabi` - **ARMv7-M** - `+v4t +v5te +v6 +v6k +v6t2 +v7 +thumb2 +thumb-mode +mclass` |
| //! - `thumbv7em-none-eabi` - **ARMv7E-M** - `+v4t +v5te +v6 +v6k +v6t2 +v7 +dsp +thumb2 +thumb-mode +mclass` |
| //! - `thumbv8m.main-none-eabi` - **ARMv8-M** - `+v4t +v5te +v6 +v6k +v6t2 +v7 +thumb2 +thumb-mode +mclass` |
| //! - `armv8r-none-eabi` - **ARMv8-R** - `+v4t +v5te +v6 +v6k +v6t2 +v7 +v8 +thumb2 +rclass` |
| //! - `aarch64-unknown-linux-gnu` - **ARMv8-A (AArch64)** - `+fp +neon` |
| //! |
| //! Section 10.1 of ACLE says: |
| //! |
| //! - "In the sequence of Arm architectures { v5, v5TE, v6, v6T2, v7 } each architecture includes |
| //! its predecessor instruction set." |
| //! |
| //! - "In the sequence of Thumb-only architectures { v6-M, v7-M, v7E-M } each architecture includes |
| //! its predecessor instruction set." |
| //! |
| //! From that info and from looking at how LLVM features work (using custom targets) we can identify |
| //! features that are subsets of others: |
| //! |
| //! Legend: `a < b` reads as "`a` is a subset of `b`"; this means that if `b` is enabled then `a` is |
| //! enabled as well. |
| //! |
| //! - `v4t < v5te < v6 < v6k < v6t2 < v7 < v8` |
| //! - `v6 < v8m < v6t2` |
| //! - `v7 < v8m.main` |
| //! |
| //! *NOTE*: Section 5.4.7 of ACLE says: |
| //! |
| //! - "__ARM_FEATURE_DSP is defined to 1 if the DSP (v5E) instructions are supported and the |
| //! intrinsics defined in Saturating intrinsics are available." |
| //! |
| //! This does *not* match how LLVM uses the '+dsp' feature; this feature is not set for v5te |
| //! targets so we have to work around this difference. |
| //! |
| //! # References |
| //! |
| //! - [ACLE Q2 2018](https://developer.arm.com/docs/101028/latest) |
| |
| // Only for 'neon' submodule |
| #![allow(non_camel_case_types)] |
| |
| // 8, 7 and 6-M are supported via dedicated instructions like DMB. All other arches are supported |
| // via CP15 instructions. See Section 10.1 of ACLE |
| mod barrier; |
| |
| pub use self::barrier::*; |
| |
| mod hints; |
| pub use self::hints::*; |
| |
| mod registers; |
| pub use self::registers::*; |
| |
| #[cfg(any(target_arch = "aarch64", target_feature = "v7", doc))] |
| mod crc; |
| #[cfg(any(target_arch = "aarch64", target_feature = "v7", doc))] |
| pub use crc::*; |
| |
| #[cfg(any(target_arch = "aarch64", target_feature = "v7", doc))] |
| mod crypto; |
| #[cfg(any(target_arch = "aarch64", target_feature = "v7", doc))] |
| pub use self::crypto::*; |
| |
| #[cfg(any(target_arch = "aarch64", target_feature = "v7", doc))] |
| pub(crate) mod neon; |
| #[cfg(any(target_arch = "aarch64", target_feature = "v7", doc))] |
| pub use self::neon::*; |
| |
| #[cfg(test)] |
| #[cfg(any(target_arch = "aarch64", target_feature = "v7", doc))] |
| pub(crate) mod test_support; |
| |
| mod sealed { |
| pub trait Dmb { |
| unsafe fn __dmb(&self); |
| } |
| |
| pub trait Dsb { |
| unsafe fn __dsb(&self); |
| } |
| |
| pub trait Isb { |
| unsafe fn __isb(&self); |
| } |
| |
| pub trait Rsr { |
| unsafe fn __rsr(&self) -> u32; |
| } |
| |
| pub trait Rsr64 { |
| unsafe fn __rsr64(&self) -> u64; |
| } |
| |
| pub trait Rsrp { |
| unsafe fn __rsrp(&self) -> *const u8; |
| } |
| |
| pub trait Wsr { |
| unsafe fn __wsr(&self, value: u32); |
| } |
| |
| pub trait Wsr64 { |
| unsafe fn __wsr64(&self, value: u64); |
| } |
| |
| pub trait Wsrp { |
| unsafe fn __wsrp(&self, value: *const u8); |
| } |
| } |
