Add enter_unprivileged() function #594
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This adds a function to switch to program stack and unprivileged mode. Fixes rust-embedded#583
kevinbube
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jonathanpallant
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Apr 27, 2025
| /// code, respectively. | ||
| #[cfg(cortex_m)] | ||
| #[inline(always)] | ||
| pub fn enter_unprivileged(psp: &u32, entry: fn() -> !) -> ! { |
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I think PSP should be either a raw pointer, or a new type that requires appropriate alignment. Conceptually this is similar to https://docs.rs/rp2040-hal/latest/rp2040_hal/multicore/struct.Core.html#method.spawn and we could borrow the StackAllocation idea.
Unfortunately I don't immediately recall if PSP needs to be 4 or 8 byte aligned. We should check, and document.
The function also needs to be marked unsafe!
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This adds a function to switch to program stack and unprivileged mode.
Fixes #583