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[i386] add unwinding via signal trampoline for kfreebsd*-gnu


Please add support for unwinding through signal handler for GNU/kFreeBSD.

The attached patch is tested on GNU/kFreeBSD, both 32-bit and 64-bit.
The i386/freebsd-unwind.h is probably also suitable for plain FreeBSD.

As suggested in http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57851
I am posting it here.

The patch mainly add new libgcc/config/i386/freebsd-unwind.h
based on linux one.

Thanks

	Petr

Attachment: kfreebsd-unwind.diff
Description: Text document


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