[PATCH] arm: Fix stack alignment during interrupt handling

[Sebastian Huber]

On 13/01/2022 13:34, Sebastian Huber wrote:
> On a public interface, the stack pointer must be aligned on an 8-byte
> boundary.  However, it may temporarily be only aligned on a 4-byte
> boundary.  The interrupt handling code must ensure that the stack
> pointer is properly aligned before it calls a function.  See also:
> 
> https://developer.arm.com/documentation/den0013/d/Interrupt-Handling/External-interrupt-requests/Nested-interrupt-handling
> 
> Close #4579.

This fix doesn't work for nested interrupts.

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