[PATCH] Re: Unwinding CFI gcc practice of assumed `same value' regs

[Jan Kratochvil <jan dot kratochvil at redhat dot com>]

Hi,

On Tue, 12 Dec 2006 16:52:33 +0100, Jakub Jelinek wrote:
...
> Here is something that would handle by default same_value retaddr_column:
[ http://sources.redhat.com/ml/gdb/2006-12/msg00100.html ]

Thanks for this backward compatible glibc unwinder patch.  I wish to have it
accepted as a step in preparing the environment to use `.cfi_undefined PC'
sometimes in the future.

Attaching patch for current glibc CVS which removes the `.cfi_undefined PC'
unwinder handling requirement but which provides explicit return address 0 from
the `__clone' function.  Currently the 0 is already present there but it is
uninitialized value out of some TLS or 'struct pthread' area (did not check).

Attaching patch for current gdb CVS to properly terminate on return address 0.
The check was already present there but it got applied one backward step later.

I hope these three patches are be 100% reliable and also backward compatible.


Regards,
Jan

Attachment: glibc-unwind-compat2.patch
Description: Text document

Attachment: gdb-bt-clone-stop.patch
Description: Text document