Re: x86_64 register cache layout

[Daniel Jacobowitz <drow at mvista dot com>]

On Thu, Dec 11, 2003 at 04:16:19PM -0800, Anthony Booker wrote:
> Hello gdb,
> 
> I am trying to implement a simple remote protocol server for an AMD
> Opteron based system.  I am happily getting exchanges back and forth,
> I'm ignoring a whole bunch of comands but eventually gdb settles down
> and says it's attached to the remote process.  I can modify memory on
> the target and see the effects on the process.
> 
> What I'd like to do is have the 'g' command actually provide register
> contents, preferably all the registers and preferably the real data. :)
> 
> To do this I'll need to find the right packing order for the reply
> frame.  From my reading so far I believe this is, with a couple of minor
> exceptions, the hex string representation of the register cache.
> 
> So I follow the bouncing ball and get down to supply_register which
> calls register data which uses reg_defs to define the order and length
> of entries in the cache.
> 
> Now reg_defs seems to be set set_register_cache but I can't find where
> that is called.  I did attach to a gdbserver and found that the caller
> seems to give regs_x86_64 as the initialiser.  But I can find neither
> hide nor hair of that variable in the gdb source I have and the
> gdbserver is sans symbols.  So I'm stuffed.
> 
> Can anyone help me join the final dot and locate the table?

Take a look at regformats/reg-x86-64.dat.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer