setcontext4m
#define setcontext(c) (CPU_HAS_SRMMU ? setcontext4m(c) \
setcontext4m(ctx);
setcontext4m(octx);
setcontext4m(ctx);
setcontext4m(octx);
setcontext4m(ctx);
setcontext4m(octx);
setcontext4m(ctx);
setcontext4m(octx);
setcontext4m(ctx);
setcontext4m(octx);
setcontext4m(cnum);
setcontext4m(0); /* paranoia? %%%: Make 0x3 a define! below */
setcontext4m(ctx);
setcontext4m(octx); /* restore context */