I've converted a few functions in cpufunc.h to inline assembly, as is
suggested by comments in their implementations. Notably

        GetCPSR
        SetSPSR
        get_stackptr
        set_stackptr

Introduced are three new functions

        __SetCPSR /* Force the CPSR to a certain value */
        __set_stackptr /* set_stackptr without changing mode */
        __get_stackptr /* get_stackptr without changing mode */

the first of which is helpful.

Would this patch be accepted? Further, is there any reason cpu_reset
has to be written in assembly?
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