Re: RFA: make sim interface use gdbarch methods for collect/supply

[Jim Blandy <jimb at redhat dot com>]

Daniel Jacobowitz <drow@false.org> writes:

> On Wed, Jun 30, 2004 at 10:47:23AM -0500, Jim Blandy wrote:
> > 
> > At the moment, remote-sim.c's gdbsim_fetch_register and
> > gdbsim_store_register functions assume that the simulator's register
> > set (as visible via sim_fetch_register and sim_store_register)
> > corresponds exactly to GDB's raw register set.  This patch is meant to
> > remove that assumption.
> > 
> > Tested on i686-pc-linux-gnu x powerpc-eabispe (sim).
> 
> We've got a whole lot of new mechanism for describing register sets. 
> Can't you use that instead of adding new supply/collect routines?

I'd love to use some existing mechanism, but I couldn't see how to
apply what I know of to this problem.  Can you give me a pointer?

If you mean the regset stuff: the sim doesn't present its registers in
terms of a single structure that one could pass to a
supply_regset_ftype or collect_regset_ftype value; you make one call
to a sim function to transfer each register.

I think what you're getting at is that SIM_COLLECT_REGISTER and
SIM_SUPPLY_REGISTER will in general have to re-implement some of the
raw/pseudo mapping.  I agree that that's unfortunate, but it's
inherent in the design: we can only collect and supply raw register
values, and our raw regcache layout is not necessarily the same as the
sim's register layout.