shared library support hookin the remote.c

[Andrew Cagney]

>>> As for the information:
>>> 
>>>  >>>> >     a) The unrelocated starting address of a segment.
>>> 
>>> Is this the offset in the object file.
> 
> 
> Yeah, this should be the segment offset from the executable.
> 
> 
>>>  >>>> >     b) The length of the segment
>>>  >>>> >     c) The address (relocated) of the segment.
>>>  >>>> >     d) The address space associated with the segment (think harvard
>>> 
>>> Rather than this is the protection mask needed (r,w,x?)
> 
> 
> I don't think this is really needed.  Though having it wouldn't hurt
> if you want an additional check to make sure that you've found an
> appropriate section.

If GDB knows a segment is read-only, it also knows that it can cache it 
-> especially important for text sections.

>>>  >>>> >        architecture here).
>>>  >>>        f) object file path
>>> 
>>> How does this compare to what is found in /proc/*/*map*?
> 
> 
> I'm not sure where you're going with this.

If we had access to the remote's /proc/*/map* (or a faked up 
equivalent), could we obtain the necessary information?

> It's useful to have the original segment address and length in order
> to find the corresponding sections.  If you don't have this
> information, you have to try to determine it by playing games with
> things like the protection mask or perhaps the order of the entries in
> the map file.  I've done this before on AIX/IA64 and it was not fun.
> 
> It's not at all clear to me though what any of this has to do with
> Stephen's orignal question.

Andrew