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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-exception6//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_H14#define ASAN_MAPPING_SPARC64_H15 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 part18// has all the bits above the 51st cleared, while the high part has them set.19// 0xfff8000000000000 - 0xffffffffffffffff20// 0x0000000000000000 - 0x0007ffffffffffff21 22#define VMA_BITS 5223#define HIGH_BITS (64 - VMA_BITS)24 25// The idea is to chop the high bits before doing the scaling, so the two26// parts become contiguous again and the usual scheme can be applied.27 28#define MEM_TO_SHADOW(mem) \29 ((((mem) << HIGH_BITS) >> (HIGH_BITS + (ASAN_SHADOW_SCALE))) + \30 (ASAN_SHADOW_OFFSET))31#define SHADOW_TO_MEM(ptr) (__asan::ShadowToMemSparc64(ptr))32 33#define kLowMemBeg 034#define kLowMemEnd (ASAN_SHADOW_OFFSET - 1)35 36#define kLowShadowBeg ASAN_SHADOW_OFFSET37#define kLowShadowEnd MEM_TO_SHADOW(kLowMemEnd)38 39// But of course there is the huge hole between the high shadow memory,40// which is in the low part, and the beginning of the high part.41 42#define kHighMemBeg (-(1ULL << (VMA_BITS - 1)))43 44#define kHighShadowBeg MEM_TO_SHADOW(kHighMemBeg)45#define kHighShadowEnd MEM_TO_SHADOW(kHighMemEnd)46 47#define kMidShadowBeg 048#define kMidShadowEnd 049 50// With the zero shadow base we can not actually map pages starting from 0.51// This constant is somewhat arbitrary.52#define kZeroBaseShadowStart 053#define kZeroBaseMaxShadowStart (1 << 18)54 55#define kShadowGapBeg (kLowShadowEnd + 1)56#define kShadowGapEnd (kHighShadowBeg - 1)57 58#define kShadowGap2Beg 059#define kShadowGap2End 060 61#define kShadowGap3Beg 062#define kShadowGap3End 063 64namespace __asan {65 66static inline bool AddrIsInLowMem(uptr a) {67 PROFILE_ASAN_MAPPING();68 return a <= kLowMemEnd;69}70 71static inline bool AddrIsInLowShadow(uptr a) {72 PROFILE_ASAN_MAPPING();73 return a >= kLowShadowBeg && a <= kLowShadowEnd;74}75 76static inline bool AddrIsInMidMem(uptr a) {77 PROFILE_ASAN_MAPPING();78 return false;79}80 81static inline bool AddrIsInMidShadow(uptr a) {82 PROFILE_ASAN_MAPPING();83 return false;84}85 86static inline bool AddrIsInHighMem(uptr a) {87 PROFILE_ASAN_MAPPING();88 return kHighMemBeg && a >= kHighMemBeg && a <= kHighMemEnd;89}90 91static inline bool AddrIsInHighShadow(uptr a) {92 PROFILE_ASAN_MAPPING();93 return kHighMemBeg && a >= kHighShadowBeg && a <= kHighShadowEnd;94}95 96static inline bool AddrIsInShadowGap(uptr a) {97 PROFILE_ASAN_MAPPING();98 return a >= kShadowGapBeg && a <= kShadowGapEnd;99}100 101static inline constexpr uptr ShadowToMemSparc64(uptr p) {102 PROFILE_ASAN_MAPPING();103 p -= ASAN_SHADOW_OFFSET;104 p <<= ASAN_SHADOW_SCALE;105 if (p >= 0x8000000000000) {106 p |= (~0ULL) << VMA_BITS;107 }108 return p;109}110 111static_assert(ShadowToMemSparc64(MEM_TO_SHADOW(0x0000000000000000)) ==112 0x0000000000000000);113static_assert(ShadowToMemSparc64(MEM_TO_SHADOW(0xfff8000000000000)) ==114 0xfff8000000000000);115// Gets aligned down.116static_assert(ShadowToMemSparc64(MEM_TO_SHADOW(0x0007ffffffffffff)) ==117 0x0007fffffffffff8);118 119} // namespace __asan120 121#endif // ASAN_MAPPING_SPARC64_H122