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" alignas(sizeof(__asan_global)) 21 __declspec(allocate(".ASAN$GA")) __asan_global __asan_globals_start = {}; 22 extern "C" alignas(sizeof(__asan_global)) 23 __declspec(allocate(".ASAN$GZ")) __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) || \ 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 45 static void register_dso_globals() { 46 call_on_globals(&__asan_register_globals); 47 } 48 49 static 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) 56 extern "C" __declspec(allocate(".CRT$XCU")) 57 void (*const __asan_dso_reg_hook)() = ®ister_dso_globals; 58 extern "C" __declspec(allocate(".CRT$XTX")) 59 void (*const __asan_dso_unreg_hook)() = &unregister_dso_globals; 60 61 } // namespace __asan 62 63 #endif // SANITIZER_WINDOWS 64