diff options
Diffstat (limited to 'lib/asan/asan_globals_win.cpp')
-rw-r--r-- | lib/asan/asan_globals_win.cpp | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/asan/asan_globals_win.cpp b/lib/asan/asan_globals_win.cpp new file mode 100644 index 000000000000..19af88ab12b4 --- /dev/null +++ b/lib/asan/asan_globals_win.cpp @@ -0,0 +1,61 @@ +//===-- asan_globals_win.cpp ----------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// Global registration code that is linked into every Windows DLL and EXE. +// +//===----------------------------------------------------------------------===// + +#include "asan_interface_internal.h" +#if SANITIZER_WINDOWS + +namespace __asan { + +#pragma section(".ASAN$GA", read, write) +#pragma section(".ASAN$GZ", read, write) +extern "C" __declspec(allocate(".ASAN$GA")) + ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_start = {}; +extern "C" __declspec(allocate(".ASAN$GZ")) + ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_end = {}; +#pragma comment(linker, "/merge:.ASAN=.data") + +static void call_on_globals(void (*hook)(__asan_global *, uptr)) { + __asan_global *start = &__asan_globals_start + 1; + __asan_global *end = &__asan_globals_end; + uptr bytediff = (uptr)end - (uptr)start; + if (bytediff % sizeof(__asan_global) != 0) { +#if defined(SANITIZER_DLL_THUNK) || defined(SANITIZER_DYNAMIC_RUNTIME_THUNK) + __debugbreak(); +#else + CHECK("corrupt asan global array"); +#endif + } + // We know end >= start because the linker sorts the portion after the dollar + // sign alphabetically. + uptr n = end - start; + hook(start, n); +} + +static void register_dso_globals() { + call_on_globals(&__asan_register_globals); +} + +static void unregister_dso_globals() { + call_on_globals(&__asan_unregister_globals); +} + +// Register globals +#pragma section(".CRT$XCU", long, read) +#pragma section(".CRT$XTX", long, read) +extern "C" __declspec(allocate(".CRT$XCU")) +void (*const __asan_dso_reg_hook)() = ®ister_dso_globals; +extern "C" __declspec(allocate(".CRT$XTX")) +void (*const __asan_dso_unreg_hook)() = &unregister_dso_globals; + +} // namespace __asan + +#endif // SANITIZER_WINDOWS |