sys_setcontext
{ .sy_narg = AS(setcontext_args), .sy_call = (sy_call_t *)sys_setcontext, .sy_auevent = AUE_NULL, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, /* 422 = setcontext */
int sys_setcontext(struct thread *, struct setcontext_args *);