libsanitizer/asan/asan_mapping_sparc64.h

   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