Re: [libunwind] unwinding through dynamically modified code?

[Young, Mark]

A disjoint code fragment that is jumped into can by described as 
performing a sequence of state save operations at instruction offset 0, 
as if the separate function entry state save instructions had 
immediately preceded the fragment. Given any possible ip in the 
fragment, the unwinder sees that the state save has already occurred and 
yet it has the complete recipe to reconstruct the previous frame state 
since it does so without looking at the code.
--Mark Young


Todd L Miller wrote:

>         I can force the remote process to load libunwind and insert calls
> to _U_dyn_register() relatively easily.  Perhaps I wasn't clear, but my
> concern was that this would not be sufficient in the case where I'm not
> registering a function, but instead a (series of) code fragment(s).  Will
> libunwind handle this scenario?  (Would it if the modifications were all
> happening locally?)
>
> - Todd L Miller
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