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// 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)
}