GSoC'11: DWARF2 call frame information

[Chagin Dmitry]

On Sun, Mar 20, 2011 at 11:08:10AM +0800, Xingxing Pan wrote:
> 2011/3/20 Chagin Dmitry <dchagin at freebsd.org>:
> > On Sun, Mar 20, 2011 at 12:36:39AM +0800, Xingxing Pan wrote:
> >> Hi, everyone.
> >>
> >> I'm a student interested in the project "DWARF2 call frame
> >> information" for Summer of Code 2011.
> >> I'd like to know which compiler I will work on to add DWARF2 support.
> >> This project is not tagged by "suggested". Will it be ok to choose it
> >> as the target?
> >>
> >
> > hi Xingxing,
> >
> > You should carefully reread the proposed idea. Especially in the
> > "A debug kernel is not able to show stack traces with cross
> > exceptions anymore. This is because we do not emit any dwarf2
> > call frame information for any assembler code, since gdb switched
> > to the dwarf2 format" part.
> >
> > And, of course, this work is very important for the community. So, IMO,
> > it will be ok as the target :)
> > Thank you.
> >
> > --
> > Have fun!
> > chd
> >
> 
> Hi chd,
> 
> Thank you for your reply. I thought the dwarf2 call frame information
> was generated by the toolchain.

mostly yes. but not in the assembler code written by hand.

> That's why I care about the states of the compiler.
> I'm not quite understand the proposed idea. Could you show me more
> details of the project?
> I really appreciate your support.
> 

hm, you should add the .cfi directive in each .S file by hand:
http://www.logix.cz/michal/devel/gas-cfi/

-- 
Have fun!
chd
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