ktr_syscall
struct ktr_syscall *ktp;
size_t len = sizeof(struct ktr_syscall) + argsize;
argp = (register_t *)((char *)ktp + sizeof(struct ktr_syscall));
static void ktrsyscall(struct ktr_syscall *, size_t);
ktrsyscall(struct ktr_syscall *ktr, size_t ktrlen)
ap = (register_t *)((char *)ktr + sizeof(struct ktr_syscall));