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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2021, Oracle and/or its affiliates. */3 4#include <test_progs.h>5 6/* Test that verifies exception handling is working. fork()7 * triggers task_newtask tracepoint; that new task will have a8 * NULL pointer task_works, and the associated task->task_works->func9 * should not be NULL if task_works itself is non-NULL.10 *11 * So to verify exception handling we want to see a NULL task_works12 * and task_works->func; if we see this we can conclude that the13 * exception handler ran when we attempted to dereference task->task_works14 * and zeroed the destination register.15 */16#include "exhandler_kern.skel.h"17 18void test_exhandler(void)19{20 int err = 0, duration = 0, status;21 struct exhandler_kern *skel;22 pid_t cpid;23 24 skel = exhandler_kern__open_and_load();25 if (CHECK(!skel, "skel_load", "skeleton failed: %d\n", err))26 goto cleanup;27 28 skel->bss->test_pid = getpid();29 30 err = exhandler_kern__attach(skel);31 if (!ASSERT_OK(err, "attach"))32 goto cleanup;33 cpid = fork();34 if (!ASSERT_GT(cpid, -1, "fork failed"))35 goto cleanup;36 if (cpid == 0)37 _exit(0);38 waitpid(cpid, &status, 0);39 40 ASSERT_NEQ(skel->bss->exception_triggered, 0, "verify exceptions occurred");41cleanup:42 exhandler_kern__destroy(skel);43}44