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Support for HAVE_REGS_AND_STACK_ACCESS_API needed for restartable sequences. The implementation has been copied from riscv and tested with the restartable sequences self tests. Note, pt-regs members are 'long' on openrisc which require casts for the api, someday we should try to update these to be 'unsigned long' as that's what they really are. Signed-off-by: Michael Jeanson <mjeanson@efficios.com> [stafford: Updated commit message] Signed-off-by: Stafford Horne <shorne@gmail.com>