Re: [patch] nto-procfs.c: Add to_xfer_partial

[Pedro Alves <pedro@codesourcery.com>]

On Tuesday 28 July 2009 21:20:04, Aleksandar Ristovski wrote:
> Pedro Alves wrote:
> > On Monday 27 July 2009 20:44:51, Aleksandar Ristovski wrote:
> >> Pedro Alves wrote:
> >>> (( Note: It isn't correct to defer to the target beneath for
> >>> TARGET_OBJECT_MEMORY (and similars) objects, but, I see that nto-procfs.c
> >>> is still implementing deprecated_xfer_memory.  ))
> >> Did you want me to make changes here?
> > 
> > Nope, consider it an FYI.
> > 

> > This offset > 0 check isn't really correct.  Would it be hard to
> > make this work with partial transfers?
> > 
> 
> Implemented.
> 

Thanks!


On Tuesday 28 July 2009 21:20:04, Aleksandar Ristovski wrote:
> ndex: gdb/nto-procfs.c
> ===================================================================
> RCS file: /cvs/src/src/gdb/nto-procfs.c,v
> retrieving revision 1.48
> diff -u -p -r1.48 nto-procfs.c
> --- gdb/nto-procfs.c    28 Jul 2009 13:20:26 -0000      1.48
> +++ gdb/nto-procfs.c    28 Jul 2009 20:16:21 -0000
> @@ -872,6 +872,56 @@ procfs_xfer_memory (CORE_ADDR memaddr, g
>    return (nbytes);
>  }
>  
> +static LONGEST
> +procfs_xfer_partial (struct target_ops *ops, enum target_object object,
> +                    const char *annex, gdb_byte *readbuf,
> +                    const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
> +{
> +  if (object == TARGET_OBJECT_MEMORY)
> +    {
> +      int nbytes = 0;
> +
> +      if (readbuf)
> +       return (*ops->deprecated_xfer_memory) (offset, readbuf,
> +                                              len, 0, NULL, ops);
> +      else if (writebuf)
> +       return (*ops->deprecated_xfer_memory) (offset, (gdb_byte*) writebuf,
> +                                              len, 1, NULL, ops);
> +      else
> +       return 0;
> +    }

Hmmm, copying from procfs.c, are we?  If you're going as far as
implementing TARGET_OBJECT_MEMORY, then why stop there and
still defer to ops->deprecated_xfer_memory?  You could just ...

> @@ -1405,6 +1455,7 @@ init_procfs_ops (void)
>    procfs_ops.to_store_registers = procfs_store_registers;
>    procfs_ops.to_prepare_to_store = procfs_prepare_to_store;
>    procfs_ops.deprecated_xfer_memory = procfs_xfer_memory;

... not install this ^^^^ and have procfs_xfer_partial call
procfs_xfer_memory directly (might as well adjust its
arguments/interface on the way).

> +  procfs_ops.to_xfer_partial = procfs_xfer_partial;


Anyway, the patch looks fine to me as is.  Feel free to go
ahead and check it in.

-- 
Pedro Alves