Re: [RFA] solib-svr4.c fetch link map address

[Daniel Jacobowitz <drow@mvista.com>]

On Tue, Oct 01, 2002 at 10:28:01PM -0400, Elena Zannoni wrote:
> 
> This function is used by thread_db.c. Gdb needs to pass the address of
> the link map to glibc. Glibc will compute the address of a thread
> local variable, given such address and the offset within the thread
> local storage at which the variable is stored (gdb gets the offset out
> of the debug info).
> 
> The interface for the glibc function is like this:
> 
> extern td_err_e td_thr_tls_get_addr (const td_thrhandle_t *__th,
>                                      void *__map_address, size_t __offset,
>                                      void **__address);
> 
> The function loops through the link maps, and returns the address of
> the one corresponding to the given objfile. Note that this function
> takes into account that objfile can be the main executable, not just a
> shared library.  The main executable has always an empty name field in
> the linkmap.

How is the interface in thread_db going to look?

Having finally gotten gdbserver thread support going, I don't want it
to lose features; so I'm going to need to communicate the necessary
information for these libthread_db queries to/from it somehow.  I'm not
clear how that should look yet.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer