1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17/*
18 * Contributed by: Intel Corporation
19 */
20
21#include <stdio.h>
22#include <signal.h>
23#include <stdlib.h>
24#include <string.h>
25#include <unwind.h>
26
27#define noinline __attribute__((__noinline__))
28#define unused __attribute__((__unused__))
29
30static noinline _Unwind_Reason_Code stop_fn(int a unused,
31    _Unwind_Action action,
32    _Unwind_Exception_Class b unused, struct _Unwind_Exception* c unused,
33    struct _Unwind_Context* d unused, void* e unused) {
34  if ((action & _UA_END_OF_STACK) != 0) {
35    // We reached the end of the stack without executing foo_cleanup. Test failed.
36    abort();
37  }
38  return _URC_NO_REASON;
39}
40
41static void noinline foo_cleanup(char* param unused) {
42  exit(42);
43}
44
45static void noinline do_crash() {
46  char* ptr = NULL;
47  *ptr = 0; // Deliberately cause a SIGSEGV.
48}
49
50static void noinline foo() {
51  char c1 __attribute__((cleanup(foo_cleanup))) unused;
52  do_crash();
53}
54
55// It's SEGSEGV handler. We start forced stack unwinding here.
56// If libgcc don't find dso for signal frame stack unwinding will be finished.
57// libgcc pass to stop_fn _UA_END_OF_STACK flag.
58// Test pass condition: stack unwinding through signal frame and foo1_handler execution.
59static void noinline sigsegv_handler(int param unused) {
60  struct _Unwind_Exception* exception = (struct _Unwind_Exception*) malloc(sizeof(*exception));
61  memset(&exception->exception_class, 0, sizeof(exception->exception_class));
62  exception->exception_cleanup = 0;
63  _Unwind_ForcedUnwind(exception, stop_fn, 0);
64}
65
66void do_test() {
67  signal(SIGSEGV, &sigsegv_handler);
68  foo();
69}
70