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-exception 6// 7//===----------------------------------------------------------------------===// 8/// 9/// \file 10/// This file is a part of HWAddressSanitizer and defines memory mapping. 11/// 12//===----------------------------------------------------------------------===// 13 14#ifndef HWASAN_MAPPING_H 15#define HWASAN_MAPPING_H 16 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/AArch64 29// 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 42inline uptr MemToShadow(uptr untagged_addr) { 43 return (untagged_addr >> kShadowScale) + 44 __hwasan_shadow_memory_dynamic_address; 45} 46inline uptr ShadowToMem(uptr shadow_addr) { 47 return (shadow_addr - __hwasan_shadow_memory_dynamic_address) << kShadowScale; 48} 49inline uptr MemToShadowSize(uptr size) { 50 return size >> kShadowScale; 51} 52 53bool MemIsApp(uptr p); 54 55} // namespace __hwasan 56 57#endif // HWASAN_MAPPING_H 58