Re: [Xen-devel] [PATCH] xen/arm: Correctly support WARN_ON

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-07-01 at 19:51 +0100, Julien Grall wrote:

> TODO:
> I haven't yet hook the code on ARM64 as I'm not sure how undefined
> instruction are handled. It looks like there is multiple way to get it
> via HSR.

I think EC==0x00 (the catchall) is where it will end up "The attempted
execution of an instruction bit patterns that has no allocated
instruction at the current Exception level".

> +/* ARM doesn't provide any undefined instruction, make our own based on
> + * a combination of bits which is not used by the instruction set
> + */
> +#define BUG_INSTR 0xe7f000f0

Linux uses 0xe7f001f2. I'm not sure what the difference is but it seems
safer to follow suit.

Ian.


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