Re: [PATCH v2] gdbserver: bfin: new port

[Mike Frysinger <vapier@gentoo.org>]

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On Tuesday, December 14, 2010 04:37:35 Andrew Stubbs wrote:
> On 13/12/10 18:43, Pedro Alves wrote:
> > Hmmm.  These last 6 look to be some kind of pseudo registers, not
> > part of the ISA -- I'm quite surprised to see these here, as
> > part of the bfin core register set.  I understand these to be
> > fdpic related; ISTR some discussion about making these be reported
> > with a new qXfer object?  That'd be better, IMO.
> 
> Right, the SH-2A FDPIC implementation uses qXfer to deal with the FDPIC
> settings. The SG++ gdb has a (more-or-less) target independent mechanism
> for retrieving the load maps. This has not been submitted upstream
> simply because it's not complete. The SH-2A FDPIC kernel does (did) not
> support breakpoints, and single stepping is (was) rather broken, so I
> never got further than being able to relocate the main program.
> 
> For SH-2A, at least, the kernel does not expose the load maps as
> registers, but has extra ptrace queries PTRACE_GETFDPIC_EXEC and
> PTRACE_GETFDPIC_INTERP.
> 
> The gdbserver reads these via qXfer:fdpic:read:exec and
> qXfer:fdpic:read:interp.

but the SuperH/FDPIC port is still out of tree right ?  so i cant review it to 
see if i can leverage it ...

if the gdbserver code can remain backwards compatible with the Linux ABI, then 
i dont have a problem changing to a qXfer style.
-mike

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