Stepping out of signal handler problem

[Aleksandar Ristovski]

Mark Kettenis wrote:
>> From: Aleksandar Ristovski <aristovski@qnx.com>
>> Date:  Fri, 16 May 2008 12:26:43 -0400
>>
>> This makes question 2: Is the only way to implement this similar to
>> linux-nat (scanning for sigreturn kernel call)? Is there anything
>> 'cleaner'?
> 
> The clean way of doing this is provide proper unwind info for the
> signal trampoline.  This shouldn't be too difficult if your signal
> trampolines live in libc, and quite a bit harder if they are in the
> kernel.
> 

What is the preferred way: frame_unwind_append_sniffer or tramp_frame_prepend_unwinder?