Re: [rfa] Attach vsyscall support for GNU/Linux

[Mark Kettenis <kettenis@gnu.org>]

   Date: Sun, 24 Oct 2004 19:16:36 -0400
   From: Daniel Jacobowitz <drow@false.org>

Thanks for the explanation Daniel!

   Unwinding bugs aside, I think it's valuable for GDB to know that it is
   at a signal trampoline.  I think the custom display in backtrace is
   valuable.  That means we should look for signal handlers before looking
   for CFI.  For NPTL that value judgement would fall the other way - not
   having to special-case signal handlers is a clear win.

Given the fact that it is desirable for GDB to know that it's dealing
with a signal handler, I think the correct approach is to extend the
DWARF2 unwinder with a method to get the frame type, similar to what
we already do for pre-initializing the register state.

I'll see if I can come up with a patch for you to test.

Cheers,

Mark