| // Reference: Section 5.4.4 "LDREX / STREX" of ACLE |
| |
| /// Removes the exclusive lock created by LDREX |
| // Supported: v6, v6K, v7-M, v7-A, v7-R |
| // Not supported: v5, v6-M |
| // NOTE: there's no dedicated CLREX instruction in v6 (<v6k); to clear the exclusive monitor users |
| // have to do a dummy STREX operation |
| #[cfg(any( |
| all(target_feature = "v6k", not(target_feature = "mclass")), // excludes v6-M |
| all(target_feature = "v7", target_feature = "mclass"), // v7-M |
| doc |
| ))] |
| pub unsafe fn __clrex() { |
| extern "unadjusted" { |
| #[link_name = "llvm.arm.clrex"] |
| fn clrex(); |
| } |
| |
| clrex() |
| } |
| |
| /// Executes an exclusive LDR instruction for 8 bit value. |
| // Supported: v6K, v7-M, v7-A, v7-R |
| // Not supported: v5, v6, v6-M |
| #[cfg(any( |
| target_feature = "v6k", // includes v7-M but excludes v6-M |
| doc |
| ))] |
| pub unsafe fn __ldrexb(p: *const u8) -> u8 { |
| extern "unadjusted" { |
| #[link_name = "llvm.arm.ldrex.p0i8"] |
| fn ldrex8(p: *const u8) -> u32; |
| } |
| |
| ldrex8(p) as u8 |
| } |
| |
| /// Executes an exclusive LDR instruction for 16 bit value. |
| // Supported: v6K, v7-M, v7-A, v7-R, v8 |
| // Not supported: v5, v6, v6-M |
| #[cfg(any( |
| target_feature = "v6k", // includes v7-M but excludes v6-M |
| doc |
| ))] |
| pub unsafe fn __ldrexh(p: *const u16) -> u16 { |
| extern "unadjusted" { |
| #[link_name = "llvm.arm.ldrex.p0i16"] |
| fn ldrex16(p: *const u16) -> u32; |
| } |
| |
| ldrex16(p) as u16 |
| } |
| |
| /// Executes an exclusive LDR instruction for 32 bit value. |
| // Supported: v6, v7-M, v6K, v7-A, v7-R, v8 |
| // Not supported: v5, v6-M |
| #[cfg(any( |
| all(target_feature = "v6", not(target_feature = "mclass")), // excludes v6-M |
| all(target_feature = "v7", target_feature = "mclass"), // v7-M |
| doc |
| ))] |
| pub unsafe fn __ldrex(p: *const u32) -> u32 { |
| extern "unadjusted" { |
| #[link_name = "llvm.arm.ldrex.p0i32"] |
| fn ldrex32(p: *const u32) -> u32; |
| } |
| |
| ldrex32(p) |
| } |
| |
| /// Executes an exclusive STR instruction for 8 bit values |
| /// |
| /// Returns `0` if the operation succeeded, or `1` if it failed |
| // supported: v6K, v7-M, v7-A, v7-R |
| // Not supported: v5, v6, v6-M |
| #[cfg(any( |
| target_feature = "v6k", // includes v7-M but excludes v6-M |
| doc |
| ))] |
| pub unsafe fn __strexb(value: u32, addr: *mut u8) -> u32 { |
| extern "unadjusted" { |
| #[link_name = "llvm.arm.strex.p0i8"] |
| fn strex8(value: u32, addr: *mut u8) -> u32; |
| } |
| |
| strex8(value, addr) |
| } |
| |
| /// Executes an exclusive STR instruction for 16 bit values |
| /// |
| /// Returns `0` if the operation succeeded, or `1` if it failed |
| // Supported: v6K, v7-M, v7-A, v7-R, v8 |
| // Not supported: v5, v6, v6-M |
| #[cfg(target_feature = "aarch64")] |
| #[cfg(any( |
| target_feature = "v6k", // includes v7-M but excludes v6-M |
| doc |
| ))] |
| pub unsafe fn __strexh(value: u16, addr: *mut u16) -> u32 { |
| extern "unadjusted" { |
| #[link_name = "llvm.arm.strex.p0i16"] |
| fn strex16(value: u32, addr: *mut u16) -> u32; |
| } |
| |
| strex16(value as u32, addr) |
| } |
| |
| /// Executes an exclusive STR instruction for 32 bit values |
| /// |
| /// Returns `0` if the operation succeeded, or `1` if it failed |
| // Supported: v6, v7-M, v6K, v7-A, v7-R, v8 |
| // Not supported: v5, v6-M |
| #[cfg(any( |
| all(target_feature = "v6", not(target_feature = "mclass")), // excludes v6-M |
| all(target_feature = "v7", target_feature = "mclass"), // v7-M |
| doc |
| ))] |
| pub unsafe fn __strex(value: u32, addr: *mut u32) -> u32 { |
| extern "unadjusted" { |
| #[link_name = "llvm.arm.strex.p0i32"] |
| fn strex32(value: u32, addr: *mut u32) -> u32; |
| } |
| |
| strex32(value, addr) |
| } |