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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
//===-- hwasan_mapping.h ----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file is a part of HWAddressSanitizer and defines memory mapping.
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///
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//===----------------------------------------------------------------------===//
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#ifndef HWASAN_MAPPING_H
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#define HWASAN_MAPPING_H
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#include "sanitizer_common/sanitizer_internal_defs.h"
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#include "hwasan_interface_internal.h"
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// Typical mapping on Linux/x86_64:
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// with dynamic shadow mapped at [0x770d59f40000, 0x7f0d59f40000]:
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// || [0x7f0d59f40000, 0x7fffffffffff] || HighMem ||
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// || [0x7efe2f934000, 0x7f0d59f3ffff] || HighShadow ||
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// || [0x7e7e2f934000, 0x7efe2f933fff] || ShadowGap ||
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// || [0x770d59f40000, 0x7e7e2f933fff] || LowShadow ||
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// || [0x000000000000, 0x770d59f3ffff] || LowMem ||
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// Typical mapping on Android/AArch64
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// with dynamic shadow mapped: [0x007477480000, 0x007c77480000]:
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// || [0x007c77480000, 0x007fffffffff] || HighMem ||
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// || [0x007c3ebc8000, 0x007c7747ffff] || HighShadow ||
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// || [0x007bbebc8000, 0x007c3ebc7fff] || ShadowGap ||
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// || [0x007477480000, 0x007bbebc7fff] || LowShadow ||
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// || [0x000000000000, 0x00747747ffff] || LowMem ||
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// Reasonable values are 4 (for 1/16th shadow) and 6 (for 1/64th).
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constexpr uptr kShadowScale = 4;
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constexpr uptr kShadowAlignment = 1ULL << kShadowScale;
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namespace __hwasan {
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extern uptr kLowMemStart;
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extern uptr kLowMemEnd;
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extern uptr kLowShadowEnd;
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extern uptr kLowShadowStart;
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extern uptr kHighShadowStart;
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extern uptr kHighShadowEnd;
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extern uptr kHighMemStart;
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extern uptr kHighMemEnd;
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inline uptr GetShadowOffset() {
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return SANITIZER_FUCHSIA ? 0 : __hwasan_shadow_memory_dynamic_address;
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}
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inline uptr MemToShadow(uptr untagged_addr) {
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return (untagged_addr >> kShadowScale) + GetShadowOffset();
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}
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inline uptr ShadowToMem(uptr shadow_addr) {
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return (shadow_addr - GetShadowOffset()) << kShadowScale;
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}
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inline uptr MemToShadowSize(uptr size) {
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return size >> kShadowScale;
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}
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bool MemIsApp(uptr p);
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inline bool MemIsShadow(uptr p) {
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return (kLowShadowStart <= p && p <= kLowShadowEnd) ||
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(kHighShadowStart <= p && p <= kHighShadowEnd);
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}
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uptr GetAliasRegionStart();
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} // namespace __hwasan
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#endif // HWASAN_MAPPING_H
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