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 16 namespace __asan { 17 18 #pragma section(".ASAN$GA", read, write) 19 #pragma section(".ASAN$GZ", read, write) 20 extern "C" __declspec(allocate(".ASAN$GA")) 21 ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_start = {}; 22 extern "C" __declspec(allocate(".ASAN$GZ")) 23 ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_end = {}; 24 #pragma comment(linker, "/merge:.ASAN=.data") 25 26 static 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 43 static void register_dso_globals() { 44 call_on_globals(&__asan_register_globals); 45 } 46 47 static 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) 54 extern "C" __declspec(allocate(".CRT$XCU")) 55 void (*const __asan_dso_reg_hook)() = ®ister_dso_globals; 56 extern "C" __declspec(allocate(".CRT$XTX")) 57 void (*const __asan_dso_unreg_hook)() = &unregister_dso_globals; 58 59 } // namespace __asan 60 61 #endif // SANITIZER_WINDOWS 62