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