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Remove lr::write() function, and add comment to lr::read() function. #589

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Merged
merged 1 commit into from
Apr 17, 2025
Merged

Remove lr::write() function, and add comment to lr::read() function. #589

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10 changes: 4 additions & 6 deletions cortex-m/src/register/lr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,9 @@
use core::arch::asm;

/// Reads the CPU register
///
/// Note that this function can't be used reliably: The value returned at least depends
/// on whether the compiler chooses to inline the function or not.
#[cfg(cortex_m)]
#[inline]
pub fn read() -> u32 {
Expand All @@ -12,9 +15,4 @@ pub fn read() -> u32 {
r
}

/// Writes `bits` to the CPU register
#[cfg(cortex_m)]
#[inline]
pub unsafe fn write(bits: u32) {
asm!("mov lr, {}", in(reg) bits, options(nomem, nostack, preserves_flags));
}
// No `write` function for the LR register, as it can't be used soundly.