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1//===-- hwasan_mapping.h ----------------------------------------*- C++ -*-===//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-exception6//7//===----------------------------------------------------------------------===//8///9/// \file10/// This file is a part of HWAddressSanitizer and defines memory mapping.11///12//===----------------------------------------------------------------------===//13 14#ifndef HWASAN_MAPPING_H15#define HWASAN_MAPPING_H16 17#include "sanitizer_common/sanitizer_internal_defs.h"18#include "hwasan_interface_internal.h"19 20// Typical mapping on Linux/x86_64:21// with dynamic shadow mapped at [0x770d59f40000, 0x7f0d59f40000]:22// || [0x7f0d59f40000, 0x7fffffffffff] || HighMem ||23// || [0x7efe2f934000, 0x7f0d59f3ffff] || HighShadow ||24// || [0x7e7e2f934000, 0x7efe2f933fff] || ShadowGap ||25// || [0x770d59f40000, 0x7e7e2f933fff] || LowShadow ||26// || [0x000000000000, 0x770d59f3ffff] || LowMem ||27 28// Typical mapping on Android/AArch6429// with dynamic shadow mapped: [0x007477480000, 0x007c77480000]:30// || [0x007c77480000, 0x007fffffffff] || HighMem ||31// || [0x007c3ebc8000, 0x007c7747ffff] || HighShadow ||32// || [0x007bbebc8000, 0x007c3ebc7fff] || ShadowGap ||33// || [0x007477480000, 0x007bbebc7fff] || LowShadow ||34// || [0x000000000000, 0x00747747ffff] || LowMem ||35 36// Reasonable values are 4 (for 1/16th shadow) and 6 (for 1/64th).37constexpr uptr kShadowScale = 4;38constexpr uptr kShadowAlignment = 1ULL << kShadowScale;39 40namespace __hwasan {41 42extern uptr kLowMemStart;43extern uptr kLowMemEnd;44extern uptr kLowShadowEnd;45extern uptr kLowShadowStart;46extern uptr kHighShadowStart;47extern uptr kHighShadowEnd;48extern uptr kHighMemStart;49extern uptr kHighMemEnd;50 51inline uptr GetShadowOffset() {52 return SANITIZER_FUCHSIA ? 0 : __hwasan_shadow_memory_dynamic_address;53}54inline uptr MemToShadow(uptr untagged_addr) {55 return (untagged_addr >> kShadowScale) + GetShadowOffset();56}57inline uptr ShadowToMem(uptr shadow_addr) {58 return (shadow_addr - GetShadowOffset()) << kShadowScale;59}60inline uptr MemToShadowSize(uptr size) {61 return size >> kShadowScale;62}63 64bool MemIsApp(uptr p);65 66inline bool MemIsShadow(uptr p) {67 return (kLowShadowStart <= p && p <= kLowShadowEnd) ||68 (kHighShadowStart <= p && p <= kHighShadowEnd);69}70 71uptr GetAliasRegionStart();72 73} // namespace __hwasan74 75#endif // HWASAN_MAPPING_H76