Re: [patch/rfc/hppa] handle setting gp for calling shlib functions

[Randolph Chung <randolph@tausq.org>]

> > Unfortunately the func_addr that is passed
> >into push_dummy_call is already the canonicalized function address,
> >so i cannot do this as part of e.g. find_global_pointer.
> 
> For PPC64 I used ABI knowledge to do a code address -> descriptor 
> address reverse lookup.  Can you do something similar?

you mean look through a opd section? unfortunately there isn't such a
thing for the 32-bit abi. it's there in hppa64. 

for hppa32, the plabel likely resides in the got/plt, and i don't think
we can easily find it there.

> Anyway, a thing-to-do-one day is to pass the function's ``value'' 
> (descriptor and type) to push-dummy-call (there has been talk of doing 
> this before).  Another is to clean up what's passed as the parameter 
> list -> again descriptors.

well, i can already do this, by *not* implementing the conversion
function. However, when the actual call is made, we need to do the
conversion.

how about adding a new gdbarch method breakpoint_from_func_ptr 
and potentially not calling convert_from_func_ptr_address() from
call_function_by_hand()? other than ia64, ppc64 and hppa, how many
function-descriptor archs do we have?

randolph
-- 
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/