[Bug libgcc/113803] libgcc unwinder stops at calls to null function pointer on some targets

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113803

--- Comment #7 from Andreas Schwab <sch...@linux-m68k.org> ---
Actually, the null return address is coming from the unwind information of
__return_rt, which is just a normal function for the unwinder.  gdb has special
knowlege to detect it as a signal trampoline (based on the function name).