Re: [PATCH v2] decode_stacktrace: Support caller address decoding

[Sasha Levin]

On Thu, Mar 05, 2026 at 06:05:59PM +0100, Matthieu Baerts wrote:
> Hi Masami,
>
> Thank you for the new version, and your previous reply!
>
> On 05/03/2026 17:52, Masami Hiramatsu (Google) wrote:
> > Add -c option to decodecall address instead of the return address.
> > With this option, it decodes the line info 1byte before the return
> > address which will be the call(branch) instruction address.
> > If the return address is a symbol address, it falls back to
> > decoding the return address.
>
> From what I got from Sasha, this "addr-1" trick seems quite common. Why
> not using this new feature by default, and having an option to disable it?

+1

> Or no option if someone can validate the new behaviour on architectures
> which have these delay slots you mentioned?

I didn't think that delay slots were an issue because architectures with delay
slots handle their stack unwinding and return address adjustment in their own
arch-specific code before it ever reaches the script.

--
Thanks,
Sasha