getcontext_args
{ .sy_narg = AS(getcontext_args), .sy_call = (sy_call_t *)sys_getcontext, .sy_auevent = AUE_NULL, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, /* 421 = getcontext */
sys_getcontext(struct thread *td, struct getcontext_args *uap)
struct getcontext_args *p = params;
int sys_getcontext(struct thread *, struct getcontext_args *);