On Fri, Sep 09, 2005 at 12:14:38PM +0100, Hugh Dickins wrote:
>
> Ah, right. I'm using kdb with it. (And my recollection of when
> show_stack did have a framepointer version, is that it was hopelessly
> broken on interrupt frames, and we're much better off without it.)
Not sure if the x86-64 kdb had code to follow them either.
The i386 one has.
>
> > The only reason to use them would be external debuggers, but those
> > don't need them on x86-64 neither.
>
> Don't need them, but find them as useful on x86_64 as on i386?
>
> Certainly, I can go on patching in FRAME_POINTERs for x86_64
> as I have done, no problem with that. But it seems both bogus
> and unhelpful to have that "&& !X86_64" in lib/Kconfig.debug -
> framepointers are as helpful/useless on x86_64 as the rest.
The original reason was that they were never enabled because
nobody passed -fno-omit-frame-pointer. That was apparently
later fixed.
But kdb should be using a dwarf2 unwinder instead. kgdb certainly
supports that, as does NLKD.
-Andi
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