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).
37 constexpr uptr kShadowScale = 4;
38 constexpr uptr kShadowAlignment = 1ULL << kShadowScale;
39
40 namespace __hwasan {
41
42 extern uptr kLowMemStart;
43 extern uptr kLowMemEnd;
44 extern uptr kLowShadowEnd;
45 extern uptr kLowShadowStart;
46 extern uptr kHighShadowStart;
47 extern uptr kHighShadowEnd;
48 extern uptr kHighMemStart;
49 extern uptr kHighMemEnd;
50
MemToShadow(uptr untagged_addr)51 inline uptr MemToShadow(uptr untagged_addr) {
52 return (untagged_addr >> kShadowScale) +
53 __hwasan_shadow_memory_dynamic_address;
54 }
ShadowToMem(uptr shadow_addr)55 inline uptr ShadowToMem(uptr shadow_addr) {
56 return (shadow_addr - __hwasan_shadow_memory_dynamic_address) << kShadowScale;
57 }
MemToShadowSize(uptr size)58 inline uptr MemToShadowSize(uptr size) {
59 return size >> kShadowScale;
60 }
61
62 bool MemIsApp(uptr p);
63
64 } // namespace __hwasan
65
66 #endif // HWASAN_MAPPING_H
67