Re: WARNING: can't access registers at asm_common_interrupt

[Peter Zijlstra]

On Wed, Nov 11, 2020 at 08:25:36PM +0000, Andrew Cooper wrote:

> > Right, it makes objtool's job a _little_ easier, since it already knows
> > how to read alternatives.  But it still has to learn to deal with the
> > conflicting stack layouts.
> 
> I suppose the needed abstraction is "these blocks will start and end
> with the same stack layout", while allowing the internals to diverge.

It's a little more complicated than that due to the fact that there is
only a single ORC table.

So something like:

	alt0		alt1
	0x00 push	0x00 nop
	0x01 nop	0x01 push

is impossible to correctly unwind.