4184 SYSCALL_DEFINE2(sigaltstack,const stack_t __user *,uss, stack_t __user *,uoss)  in SYSCALL_DEFINE2()  argument
4188 	if (uss && copy_from_user(&new, uss, sizeof(stack_t)))  in SYSCALL_DEFINE2()
4190 	err = do_sigaltstack(uss ? &new : NULL, uoss ? &old : NULL,  in SYSCALL_DEFINE2()
4198 int restore_altstack(const stack_t __user *uss)  in restore_altstack()  argument
4201 	if (copy_from_user(&new, uss, sizeof(stack_t)))  in restore_altstack()
4209 int __save_altstack(stack_t __user *uss, unsigned long sp)  in __save_altstack()  argument
4212 	int err = __put_user((void __user *)t->sas_ss_sp, &uss->ss_sp) |  in __save_altstack()
4213 		__put_user(t->sas_ss_flags, &uss->ss_flags) |  in __save_altstack()
4214 		__put_user(t->sas_ss_size, &uss->ss_size);  in __save_altstack()
4222 	stack_t uss, uoss;  in do_compat_sigaltstack()  local
4229 		uss.ss_sp = compat_ptr(uss32.ss_sp);  in do_compat_sigaltstack()
4230 		uss.ss_flags = uss32.ss_flags;  in do_compat_sigaltstack()
4231 		uss.ss_size = uss32.ss_size;  in do_compat_sigaltstack()
4233 	ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss,  in do_compat_sigaltstack()
4255 int compat_restore_altstack(const compat_stack_t __user *uss)  in compat_restore_altstack()  argument
4257 	int err = do_compat_sigaltstack(uss, NULL);  in compat_restore_altstack()
4262 int __compat_save_altstack(compat_stack_t __user *uss, unsigned long sp)  in __compat_save_altstack()  argument
4267 			 &uss->ss_sp) |  in __compat_save_altstack()
4268 		__put_user(t->sas_ss_flags, &uss->ss_flags) |  in __compat_save_altstack()
4269 		__put_user(t->sas_ss_size, &uss->ss_size);  in __compat_save_altstack()