Re: [libunwind] unwinding through dynamically modified code?

[David Mosberger]

>>>>> On Mon, 15 Mar 2004 16:43:30 -0600 (CST), Todd L Miller <address@hidden> 
>>>>> said:

  Todd>         Each of these code fragments will be called from only
  Todd> one place.  I do know the _register_ frame state, but not, for
  Todd> instance, where the original SP is stored.  That information
  Todd> can be extracted from the unwind information for the function
  Todd> (in which the jump to the code fragment was inserted), but I
  Todd> want to use libunwind's decoder to do so.

Hmmh, you should be able to use the ALIAS operator to say the frame
state looks like at IP such-and-such, and then provide additional
unwind directives to patch things up the way you need them to be.

  Todd>         Given that the recommended course of action seems to
  Todd> be to create a "dummy region" with the unwind information from
  Todd> the function (in which the jump to the code fragment was
  Todd> inserted), how can I use libunwind to get this information?
  Todd> E.g., can I hand it an address and ask it for the
  Todd> unw_region_info_t(s) describing it?

There is no such facility at the moment.  Can you make things work
with the ALIAS directive?

        --david