coredump to ram may be noninvertible transform
Core dump to RAM image is not a trivially invertible transform. The problem is that the core dump includes the register images and memory image inside the process. The mapping from the process memory space to the RAM addresses depends on the registers in the memory management unit (MMU). That is, there may be no fixed mapping from RAM address back to process memory address space because you do not have the MMU and register contents.
I am weak on my familiarity with sparc architecture, so my comments are a best somewhat-educated guess on my part.