Re: [RFC PATCH v1 04/25] unwind_user: Flexible FP/RA recovery rules

[sashiko-bot@kernel.org]

> To enable support for SFrame V3 flexible FDEs with a subsequent patch,
> add support for the following flexible frame pointer (FP) and return
> address (RA) recovery rules:
> 
>   FP/RA = *(CFA + offset)
>   FP/RA = register + offset
>   FP/RA = *(register + offset)
> 
> Note that FP/RA recovery rules that use arbitrary register contents are
> only valid when in the topmost frame, as their contents are otherwise
> unknown.
> 
> This also enables unwinding of user space for architectures, such as
> s390, that may save the frame pointer (FP) and/or return address (RA) in
> other registers, for instance when in a leaf function.
> 
> Reviewed-by: Indu Bhagat <ibhagatgnu@gmail.com>
> Signed-off-by: Jens Remus <jremus@linux.ibm.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260818144954.2320378-1-jremus@linux.ibm.com?part=4