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Re: x86_64 unwinder in libgcc_s
On 08/14/2012 09:44 AM, Dmitri Shubin wrote:
> Any thoughts on this?
> Or maybe it's wrong list for this question?
You've already had an answer from Richard Henderson, who is probably
the best-placed person to answer you.
Please don't top-post.
> On 07.08.2012 12:09, Dmitri Shubin wrote:
>> On 06.08.2012 21:13, Richard Henderson wrote:
>>> On 08/06/2012 08:23 AM, Dmitri Shubin wrote:
>>>> char *cfa = (char *) _Unwind_GetCFA(ctx);
>>>> printf("cfa = %p\nra = %p\n", cfa, *(void **)(cfa - 8));
>>> Use _Unwind_GetIP here, for one.
>> In fact I'm not interested in IP or RA here, I need some context
>> stored by assembly routine on the stack relative to its CFA.
>> I use RA only to illustrate that I got "wrong" (from my pov) CFA from
>> libgcc unwinder.
>> And the question is is it a bug (or deviation from x86-64 psABI) in
>> libgcc or I misunderstand what CFA is.