Re: implement backtraces for AMD64

[Mike Cvet <mcvet at redhat dot com>]

On Sun, 2006-09-17 at 04:45 -0300, Alexandre Oliva wrote:
> This patch adds the missing bits to enable libunwind-based backtraces
> on AMD64/EM64T.  A few notes:
> 
> - The existing IsaEMT64 is misnamed: the correct spelling is EM64T,
> not EMT64.  We should probably prefer the more neutral X86_64 name (as
> in the ELF data structure), or favor AMD64, like I did in the new
> RegisterAMD64 class (just trying to set balance ;-)
> 
> - I'm not entirely happy with adding libunwind-specific information to
> Isa, but Isa doesn't currently provide enough information to enable
> some alternate implementation that would keep everything entirely
> separate.  If we had a method to return the Isa name or the ELF
> machine type or some such, then it would be possible to turn that into
> a reworked Register* factory/singleton pattern similar to that used
> for Isa, all within lib/unwind.  It certainly doesn't help that
> lib/unwind is in frysk-imports, so it can't use anything in
> frysk-core; frysk-core/rt would have to have the glue.
> 
> Comments?  Any architectural guidance?  Or is this ok to install?
> 

Please go ahead and commit your changes, thanks.

- Mike