asan_mapping.h revision 229109
1//===-- asan_mapping.h ------------------------------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file is a part of AddressSanitizer, an address sanity checker. 11// 12// Defines ASan memory mapping. 13//===----------------------------------------------------------------------===// 14#ifndef ASAN_MAPPING_H 15#define ASAN_MAPPING_H 16 17#include "asan_internal.h" 18 19// The full explanation of the memory mapping could be found here: 20// http://code.google.com/p/address-sanitizer/wiki/AddressSanitizerAlgorithm 21 22#if ASAN_FLEXIBLE_MAPPING_AND_OFFSET == 1 23extern __attribute__((visibility("default"))) uintptr_t __asan_mapping_scale; 24extern __attribute__((visibility("default"))) uintptr_t __asan_mapping_offset; 25#define SHADOW_SCALE (__asan_mapping_scale) 26#define SHADOW_OFFSET (__asan_mapping_offset) 27#else 28#define SHADOW_SCALE (3) 29#if __WORDSIZE == 32 30#define SHADOW_OFFSET (1 << 29) 31#else 32#define SHADOW_OFFSET (1ULL << 44) 33#endif 34#endif // ASAN_FLEXIBLE_MAPPING_AND_OFFSET 35 36#define SHADOW_GRANULARITY (1ULL << SHADOW_SCALE) 37#define MEM_TO_SHADOW(mem) (((mem) >> SHADOW_SCALE) | (SHADOW_OFFSET)) 38 39#if __WORDSIZE == 64 40 static const size_t kHighMemEnd = 0x00007fffffffffffUL; 41#else // __WORDSIZE == 32 42 static const size_t kHighMemEnd = 0xffffffff; 43#endif // __WORDSIZE 44 45 46#define kLowMemBeg 0 47#define kLowMemEnd (SHADOW_OFFSET ? SHADOW_OFFSET - 1 : 0) 48 49#define kLowShadowBeg SHADOW_OFFSET 50#define kLowShadowEnd MEM_TO_SHADOW(kLowMemEnd) 51 52#define kHighMemBeg (MEM_TO_SHADOW(kHighMemEnd) + 1) 53 54#define kHighShadowBeg MEM_TO_SHADOW(kHighMemBeg) 55#define kHighShadowEnd MEM_TO_SHADOW(kHighMemEnd) 56 57#define kShadowGapBeg (kLowShadowEnd ? kLowShadowEnd + 1 : 16 * kPageSize) 58#define kShadowGapEnd (kHighShadowBeg - 1) 59 60#define kGlobalAndStackRedzone \ 61 (SHADOW_GRANULARITY < 32 ? 32 : SHADOW_GRANULARITY) 62 63namespace __asan { 64 65static inline bool AddrIsInLowMem(uintptr_t a) { 66 return a < kLowMemEnd; 67} 68 69static inline bool AddrIsInLowShadow(uintptr_t a) { 70 return a >= kLowShadowBeg && a <= kLowShadowEnd; 71} 72 73static inline bool AddrIsInHighMem(uintptr_t a) { 74 return a >= kHighMemBeg && a <= kHighMemEnd; 75} 76 77static inline bool AddrIsInMem(uintptr_t a) { 78 return AddrIsInLowMem(a) || AddrIsInHighMem(a); 79} 80 81static inline uintptr_t MemToShadow(uintptr_t p) { 82 CHECK(AddrIsInMem(p)); 83 return MEM_TO_SHADOW(p); 84} 85 86static inline bool AddrIsInHighShadow(uintptr_t a) { 87 return a >= kHighShadowBeg && a <= kHighMemEnd; 88} 89 90static inline bool AddrIsInShadow(uintptr_t a) { 91 return AddrIsInLowShadow(a) || AddrIsInHighShadow(a); 92} 93 94static inline bool AddrIsAlignedByGranularity(uintptr_t a) { 95 return (a & (SHADOW_GRANULARITY - 1)) == 0; 96} 97 98} // namespace __asan 99 100#endif // ASAN_MAPPING_H 101