1 /*
2 * Copyright (C) 2017 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 #include <stdint.h>
18 #include <stdlib.h>
19
20 #include "CHECK.h"
21
22 // This library is built for all targets, including host tests, so __cfi_slowpath may not be
23 // present. But it is only used in the bionic loader tests.
24 extern "C" __attribute__((weak)) void __cfi_slowpath(uint64_t, void*);
25
26 static int g_count;
27
28 // Mock a CFI-enabled library without relying on the compiler.
29 extern "C" __attribute__((no_sanitize("hwaddress"))) __attribute__((aligned(4096)))
__cfi_check(uint64_t,void *,void *)30 void __cfi_check(uint64_t /*CallSiteTypeId*/, void* /*TargetAddr*/, void* /*Diag*/) {
31 ++g_count;
32 }
33
34 // This code runs before hwasan is initialized.
35 __attribute__((no_sanitize("hwaddress")))
preinit_ctor()36 void preinit_ctor() {
37 CHECK(g_count == 0);
38 __cfi_slowpath(42, reinterpret_cast<void*>(&preinit_ctor));
39 CHECK(g_count == 1);
40 }
41
42 __attribute__((section(".preinit_array"), used)) void (*preinit_ctor_p)(void) = preinit_ctor;
43
ctor()44 __attribute__((constructor, used)) void ctor() {
45 CHECK(g_count == 1);
46 __cfi_slowpath(42, reinterpret_cast<void*>(&ctor));
47 CHECK(g_count == 2);
48 }
49
main(void)50 int main(void) {
51 CHECK(g_count == 2);
52 __cfi_slowpath(42, reinterpret_cast<void*>(&main));
53 CHECK(g_count == 3);
54 return 0;
55 }
56