or1k_fetch_registers. This function populates the register cache from the actual target registers. The interface to the OpenRISC 1000 only provides for reading of memory or SPRs. However the GPRs are mapped into the SPR space, so can be read in this way.

or1k_store_registers. This is the inverse of or1k_fetch_registers. It writes the contents of the register cache back to the physical registers on the target.

or1k_prepare_to_store. GDB allows for targets which need some preparatory work before storing, so provides this function. It is not needed for the OpenRISC 1000, so just returns.

or1k_xfer_partial. This is the generic function for reading and writing objects from and to the target. However the only class of object which needs be supported is read and write from memory. This is achieved through the low-level interface routines or1k_jtag_read_mem and or1k_jtag_write_mem.

generic_load. This generic function is used as the to_load function of the target operations. There is nothing special about loading OpenRISC 1000 images. This function will call the or1k_xfer_partial function to transfer the bytes for each section of the image.