1 //===-- asan_mapping_sparc64.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 // This file is a part of AddressSanitizer, an address sanity checker. 10 // 11 // SPARC64-specific definitions for ASan memory mapping. 12 //===----------------------------------------------------------------------===// 13 #ifndef ASAN_MAPPING_SPARC64_H 14 #define ASAN_MAPPING_SPARC64_H 15 16 // This is tailored to the 52-bit VM layout on SPARC-T4 and later. 17 // The VM space is split into two 51-bit halves at both ends: the low part 18 // has all the bits above the 51st cleared, while the high part has them set. 19 // 0xfff8000000000000 - 0xffffffffffffffff 20 // 0x0000000000000000 - 0x0007ffffffffffff 21 22 #define VMA_BITS 52 23 #define HIGH_BITS (64 - VMA_BITS) 24 25 // The idea is to chop the high bits before doing the scaling, so the two 26 // parts become contiguous again and the usual scheme can be applied. 27 28 #define MEM_TO_SHADOW(mem) \ 29 ((((mem) << HIGH_BITS) >> (HIGH_BITS + (SHADOW_SCALE))) + (SHADOW_OFFSET)) 30 31 #define kLowMemBeg 0 32 #define kLowMemEnd (SHADOW_OFFSET - 1) 33 34 #define kLowShadowBeg SHADOW_OFFSET 35 #define kLowShadowEnd MEM_TO_SHADOW(kLowMemEnd) 36 37 // But of course there is the huge hole between the high shadow memory, 38 // which is in the low part, and the beginning of the high part. 39 40 #define kHighMemBeg (-(1ULL << (VMA_BITS - 1))) 41 42 #define kHighShadowBeg MEM_TO_SHADOW(kHighMemBeg) 43 #define kHighShadowEnd MEM_TO_SHADOW(kHighMemEnd) 44 45 #define kMidShadowBeg 0 46 #define kMidShadowEnd 0 47 48 // With the zero shadow base we can not actually map pages starting from 0. 49 // This constant is somewhat arbitrary. 50 #define kZeroBaseShadowStart 0 51 #define kZeroBaseMaxShadowStart (1 << 18) 52 53 #define kShadowGapBeg (kLowShadowEnd + 1) 54 #define kShadowGapEnd (kHighShadowBeg - 1) 55 56 #define kShadowGap2Beg 0 57 #define kShadowGap2End 0 58 59 #define kShadowGap3Beg 0 60 #define kShadowGap3End 0 61 62 namespace __asan { 63 64 static inline bool AddrIsInLowMem(uptr a) { 65 PROFILE_ASAN_MAPPING(); 66 return a <= kLowMemEnd; 67 } 68 69 static inline bool AddrIsInLowShadow(uptr a) { 70 PROFILE_ASAN_MAPPING(); 71 return a >= kLowShadowBeg && a <= kLowShadowEnd; 72 } 73 74 static inline bool AddrIsInMidMem(uptr a) { 75 PROFILE_ASAN_MAPPING(); 76 return false; 77 } 78 79 static inline bool AddrIsInMidShadow(uptr a) { 80 PROFILE_ASAN_MAPPING(); 81 return false; 82 } 83 84 static inline bool AddrIsInHighMem(uptr a) { 85 PROFILE_ASAN_MAPPING(); 86 return kHighMemBeg && a >= kHighMemBeg && a <= kHighMemEnd; 87 } 88 89 static inline bool AddrIsInHighShadow(uptr a) { 90 PROFILE_ASAN_MAPPING(); 91 return kHighMemBeg && a >= kHighShadowBeg && a <= kHighShadowEnd; 92 } 93 94 static inline bool AddrIsInShadowGap(uptr a) { 95 PROFILE_ASAN_MAPPING(); 96 return a >= kShadowGapBeg && a <= kShadowGapEnd; 97 } 98 99 } // namespace __asan 100 101 #endif // ASAN_MAPPING_SPARC64_H 102