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

[Elena Zannoni <ezannoni at redhat dot com>]

Daniel Jacobowitz writes:
 > 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.
 > 

I am preparing the rest of the patch. Hold on. I eventually fell
asleep last night...:-(

Elena

 > -- 
 > Daniel Jacobowitz
 > MontaVista Software                         Debian GNU/Linux Developer