linux_syscall_fancy
void linux_syscall_fancy(struct lwp *, uint64_t, struct trapframe *);
p->p_md.md_syscall = linux_syscall_fancy;
p->p_md.md_syscall = linux_syscall_fancy;
void linux_syscall_fancy(struct trapframe *, struct lwp *, uint32_t);
static void linux_syscall_fancy(register_t, struct lwp *, struct frame *);
p->p_md.md_syscall = linux_syscall_fancy;