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" __declspec(allocate(".ASAN$GA")) 21 ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_start = {}; 22extern "C" __declspec(allocate(".ASAN$GZ")) 23 ALIGNED(sizeof(__asan_global)) __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) || defined(SANITIZER_DYNAMIC_RUNTIME_THUNK) 32 __debugbreak(); 33#else 34 CHECK("corrupt asan global array"); 35#endif 36 } 37 // We know end >= start because the linker sorts the portion after the dollar 38 // sign alphabetically. 39 uptr n = end - start; 40 hook(start, n); 41} 42 43static void register_dso_globals() { 44 call_on_globals(&__asan_register_globals); 45} 46 47static void unregister_dso_globals() { 48 call_on_globals(&__asan_unregister_globals); 49} 50 51// Register globals 52#pragma section(".CRT$XCU", long, read) 53#pragma section(".CRT$XTX", long, read) 54extern "C" __declspec(allocate(".CRT$XCU")) 55void (*const __asan_dso_reg_hook)() = ®ister_dso_globals; 56extern "C" __declspec(allocate(".CRT$XTX")) 57void (*const __asan_dso_unreg_hook)() = &unregister_dso_globals; 58 59} // namespace __asan 60 61#endif // SANITIZER_WINDOWS 62