// SPDX-License-Identifier: GPL-2.0/* Copyright (c) 2021, Oracle and/or its affiliates. */ #include <test_progs.h> /* Test that verifies exception handling is working. fork() * triggers task_newtask tracepoint; that new task will have a * NULL pointer task_works, and the associated task->task_works->func * should not be NULL if task_works itself is non-NULL. * * So to verify exception handling we want to see a NULL task_works * and task_works->func; if we see this we can conclude that the * exception handler ran when we attempted to dereference task->task_works * and zeroed the destination register. */#include "exhandler_kern.skel.h" void test_exhandler(void){	int err = 0, duration = 0, status;	struct exhandler_kern *skel;	pid_t cpid; 	skel = exhandler_kern__open_and_load();	if (CHECK(!skel, "skel_load", "skeleton failed: %d\n", err))		goto cleanup; 	skel->bss->test_pid = getpid(); 	err = exhandler_kern__attach(skel);	if (!ASSERT_OK(err, "attach"))		goto cleanup;	cpid = fork();	if (!ASSERT_GT(cpid, -1, "fork failed"))		goto cleanup;	if (cpid == 0)		_exit(0);	waitpid(cpid, &status, 0); 	ASSERT_NEQ(skel->bss->exception_triggered, 0, "verify exceptions occurred");cleanup:	exhandler_kern__destroy(skel);}