1 files changed, 57 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/hwasan/hwasan_mapping.h b/contrib/llvm-project/compiler-rt/lib/hwasan/hwasan_mapping.h
new file mode 100644
index 000000000000..a86ad7ca8036
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/hwasan/hwasan_mapping.h
@@ -0,0 +1,57 @@
+//===-- hwasan_mapping.h ----------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file is a part of HWAddressSanitizer and defines memory mapping.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef HWASAN_MAPPING_H
+#define HWASAN_MAPPING_H
+
+#include "sanitizer_common/sanitizer_internal_defs.h"
+#include "hwasan_interface_internal.h"
+
+// Typical mapping on Linux/x86_64:
+// with dynamic shadow mapped at [0x770d59f40000, 0x7f0d59f40000]:
+// || [0x7f0d59f40000, 0x7fffffffffff] || HighMem    ||
+// || [0x7efe2f934000, 0x7f0d59f3ffff] || HighShadow ||
+// || [0x7e7e2f934000, 0x7efe2f933fff] || ShadowGap  ||
+// || [0x770d59f40000, 0x7e7e2f933fff] || LowShadow  ||
+// || [0x000000000000, 0x770d59f3ffff] || LowMem     ||
+
+// Typical mapping on Android/AArch64
+// with dynamic shadow mapped: [0x007477480000, 0x007c77480000]:
+// || [0x007c77480000, 0x007fffffffff] || HighMem    ||
+// || [0x007c3ebc8000, 0x007c7747ffff] || HighShadow ||
+// || [0x007bbebc8000, 0x007c3ebc7fff] || ShadowGap  ||
+// || [0x007477480000, 0x007bbebc7fff] || LowShadow  ||
+// || [0x000000000000, 0x00747747ffff] || LowMem     ||
+
+// Reasonable values are 4 (for 1/16th shadow) and 6 (for 1/64th).
+constexpr uptr kShadowScale = 4;
+constexpr uptr kShadowAlignment = 1ULL << kShadowScale;
+
+namespace __hwasan {
+
+inline uptr MemToShadow(uptr untagged_addr) {
+  return (untagged_addr >> kShadowScale) +
+         __hwasan_shadow_memory_dynamic_address;
+}
+inline uptr ShadowToMem(uptr shadow_addr) {
+  return (shadow_addr - __hwasan_shadow_memory_dynamic_address) << kShadowScale;
+}
+inline uptr MemToShadowSize(uptr size) {
+  return size >> kShadowScale;
+}
+
+bool MemIsApp(uptr p);
+
+}  // namespace __hwasan
+
+#endif  // HWASAN_MAPPING_H