1//===-- asan_globals_win.cpp ----------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// Global registration code that is linked into every Windows DLL and EXE.
10//
11//===----------------------------------------------------------------------===//
12
13#include "asan_interface_internal.h"
14#if SANITIZER_WINDOWS
15
16namespace __asan {
17
18#pragma section(".ASAN$GA", read, write)
19#pragma section(".ASAN$GZ", read, write)
20extern "C" alignas(sizeof(__asan_global))
21 __declspec(allocate(".ASAN$GA")) __asan_global __asan_globals_start = {};
22extern "C" alignas(sizeof(__asan_global))
23 __declspec(allocate(".ASAN$GZ")) __asan_global __asan_globals_end = {};
24#pragma comment(linker, "/merge:.ASAN=.data")
25
26static void call_on_globals(void (*hook)(__asan_global *, uptr)) {
27 __asan_global *start = &__asan_globals_start + 1;
28 __asan_global *end = &__asan_globals_end;
29 uptr bytediff = (uptr)end - (uptr)start;
30 if (bytediff % sizeof(__asan_global) != 0) {
31# if defined(SANITIZER_DLL_THUNK) || \
32 defined(SANITIZER_DYNAMIC_RUNTIME_THUNK) || \
33 defined(SANITIZER_STATIC_RUNTIME_THUNK)
34 __debugbreak();
35#else
36 CHECK("corrupt asan global array");
37#endif
38 }
39 // We know end >= start because the linker sorts the portion after the dollar
40 // sign alphabetically.
41 uptr n = end - start;
42 hook(start, n);
43}
44
45static void register_dso_globals() {
46 call_on_globals(&__asan_register_globals);
47}
48
49static void unregister_dso_globals() {
50 call_on_globals(&__asan_unregister_globals);
51}
52
53// Register globals
54#pragma section(".CRT$XCU", long, read)
55#pragma section(".CRT$XTX", long, read)
56extern "C" __declspec(allocate(".CRT$XCU"))
57void (*const __asan_dso_reg_hook)() = &register_dso_globals;
58extern "C" __declspec(allocate(".CRT$XTX"))
59void (*const __asan_dso_unreg_hook)() = &unregister_dso_globals;
60
61} // namespace __asan
62
63#endif // SANITIZER_WINDOWS
64