[PATCH] i386/x86-64: adjust unwind information register encodings

[Jan Beulich]

>>> "H. J. Lu" <hjl@lucon.org> 06.05.05 17:33:26 >>>
>On Fri, May 06, 2005 at 05:05:48PM +0200, Jan Beulich wrote:
>> >>> "H. J. Lu" <hjl@lucon.org> 06.05.05 16:00:38 >>>
>> >On Fri, May 06, 2005 at 02:01:21PM +0200, Jan Beulich wrote:
>> >> The register numbers used in x86-64's .eh_frame entries neither matched the
>> >> ABI nor the gcc implementation. Additionally, a significant amount of
>> >> registers were missing in both 32- and 64-bit modes (even now there are, but
>> >> only those for which there don't appear to be register numbers assigned in
>> >> the respective ABI).
>> >> 
>> >
>> >Have we been generating wrong unwind info up to now?
>> 
>> Yes, it looks like that.
>
>How has it ever worked with glibc and gdb?

Because the CFI directives are rarely used, and (as Daniel pointed out) only some registers were mis-numbered.

Jan