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rp/multicore: ensure stack is 8-byte aligned.

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This commit is contained in:
Dario Nieuwenhuis 2023-05-16 01:42:35 +02:00
parent 0c18a13cc0
commit 56c3a949af
1 changed files with 6 additions and 1 deletions
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7
embassy-rp/src/multicore.rs
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@ -153,7 +153,12 @@ where
psm.frce_off().modify(|w| w.set_proc1(false));
}
let mem = unsafe { core::slice::from_raw_parts_mut(stack.mem.as_mut_ptr() as *mut usize, stack.mem.len() / 4) };
// The ARM AAPCS ABI requires 8-byte stack alignment.
// #[align] on `struct Stack` ensures the bottom is aligned, but the top could still be
// unaligned if the user chooses a stack size that's not multiple of 8.
// So, we round down to the next multiple of 8.
let stack_words = stack.mem.len() / 8 * 2;
let mem = unsafe { core::slice::from_raw_parts_mut(stack.mem.as_mut_ptr() as *mut usize, stack_words) };
// Set up the stack
let mut stack_ptr = unsafe { mem.as_mut_ptr().add(mem.len()) };