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
62namespace __asan {
63
64static inline bool AddrIsInLowMem(uptr a) {
65  PROFILE_ASAN_MAPPING();
66  return a <= kLowMemEnd;
67}
68
69static inline bool AddrIsInLowShadow(uptr a) {
70  PROFILE_ASAN_MAPPING();
71  return a >= kLowShadowBeg && a <= kLowShadowEnd;
72}
73
74static inline bool AddrIsInMidMem(uptr a) {
75  PROFILE_ASAN_MAPPING();
76  return false;
77}
78
79static inline bool AddrIsInMidShadow(uptr a) {
80  PROFILE_ASAN_MAPPING();
81  return false;
82}
83
84static inline bool AddrIsInHighMem(uptr a) {
85  PROFILE_ASAN_MAPPING();
86  return kHighMemBeg && a >= kHighMemBeg && a <= kHighMemEnd;
87}
88
89static inline bool AddrIsInHighShadow(uptr a) {
90  PROFILE_ASAN_MAPPING();
91  return kHighMemBeg && a >= kHighShadowBeg && a <= kHighShadowEnd;
92}
93
94static 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