140 	struct unwindme *u = unwindme;  in pgm_pre_handler()  local
142 	u->ret = test_unwind(NULL, (u->flags & UWM_REGS) ? regs : NULL,  in pgm_pre_handler()
143 			     (u->flags & UWM_SP) ? u->sp : 0);  in pgm_pre_handler()
149 static noinline int unwindme_func4(struct unwindme *u)  in unwindme_func4()  argument
151 	if (!(u->flags & UWM_CALLER))  in unwindme_func4()
152 		u->sp = current_frame_address();  in unwindme_func4()
153 	if (u->flags & UWM_THREAD) {  in unwindme_func4()
154 		complete(&u->task_ready);  in unwindme_func4()
155 		wait_event(u->task_wq, kthread_should_park());  in unwindme_func4()
159 	} else if (u->flags & UWM_PGM) {  in unwindme_func4()
163 		unwindme = u;  in unwindme_func4()
185 		return u->ret;  in unwindme_func4()
194 				   (u->flags & UWM_REGS) ? &regs : NULL,  in unwindme_func4()
195 				   (u->flags & UWM_SP) ? u->sp : 0);  in unwindme_func4()
200 static noinline int unwindme_func3(struct unwindme *u)  in unwindme_func3()  argument
202 	u->sp = current_frame_address();  in unwindme_func3()
203 	return unwindme_func4(u);  in unwindme_func3()
207 static noinline int unwindme_func2(struct unwindme *u)  in unwindme_func2()  argument
212 	if (u->flags & UWM_SWITCH_STACK) {  in unwindme_func2()
215 		rc = CALL_ON_STACK(unwindme_func3, S390_lowcore.nodat_stack, 1, u);  in unwindme_func2()
220 		return unwindme_func3(u);  in unwindme_func2()
225 static noinline int unwindme_func1(void *u)  in unwindme_func1()  argument
227 	return unwindme_func2((struct unwindme *)u);  in unwindme_func1()
234 	struct unwindme *u = READ_ONCE(unwindme);  in unwindme_irq_handler()  local
236 	if (u && u->task == current) {  in unwindme_irq_handler()
238 		u->task = NULL;  in unwindme_irq_handler()
239 		u->ret = unwindme_func1(u);  in unwindme_irq_handler()
243 static int test_unwind_irq(struct unwindme *u)  in test_unwind_irq()  argument
250 	u->task = current;  in test_unwind_irq()
251 	unwindme = u;  in test_unwind_irq()
255 	return u->ret;  in test_unwind_irq()
259 static int test_unwind_task(struct unwindme *u)  in test_unwind_task()  argument
265 	init_completion(&u->task_ready);  in test_unwind_task()
266 	init_waitqueue_head(&u->task_wq);  in test_unwind_task()
272 	task = kthread_run(unwindme_func1, u, "%s", __func__);  in test_unwind_task()
281 	wait_for_completion(&u->task_ready);  in test_unwind_task()
284 	ret = test_unwind(task, NULL, (u->flags & UWM_SP) ? u->sp : 0);  in test_unwind_task()
291 	struct unwindme u;  in test_unwind_flags()  local
293 	u.flags = flags;  in test_unwind_flags()
294 	if (u.flags & UWM_THREAD)  in test_unwind_flags()
295 		return test_unwind_task(&u);  in test_unwind_flags()
296 	else if (u.flags & UWM_IRQ)  in test_unwind_flags()
297 		return test_unwind_irq(&u);  in test_unwind_flags()
299 		return unwindme_func1(&u);  in test_unwind_flags()