Saving core via GDB remote

Hi,

I use GDB with remote targets.

Sometimes I wish I could actually get the local GDB process to save
a local core file for the remote target.   This way I can reboot the target
or share the core files with my peers, or if nothing else,  use the local
disk as a cache and have better user interaction (after initial dump cost).

Is there a way to do this?  Maybe with a macro?

My targets are diskless embedded systems (mips-elf, sparc-coff)  with
no control  over the gdb stub portion.

I would appreciated any hints
    Thanks
        -Nevo