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      1 //===-- dfsan_platform.h ----------------------------------------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file is a part of DataFlowSanitizer.
     11 //
     12 // Platform specific information for DFSan.
     13 //===----------------------------------------------------------------------===//
     14 
     15 #ifndef DFSAN_PLATFORM_H
     16 #define DFSAN_PLATFORM_H
     17 
     18 namespace __dfsan {
     19 
     20 #if defined(__x86_64__)
     21 struct Mapping {
     22   static const uptr kShadowAddr = 0x10000;
     23   static const uptr kUnionTableAddr = 0x200000000000;
     24   static const uptr kAppAddr = 0x700000008000;
     25   static const uptr kShadowMask = ~0x700000000000;
     26 };
     27 #elif defined(__mips64)
     28 struct Mapping {
     29   static const uptr kShadowAddr = 0x10000;
     30   static const uptr kUnionTableAddr = 0x2000000000;
     31   static const uptr kAppAddr = 0xF000008000;
     32   static const uptr kShadowMask = ~0xF000000000;
     33 };
     34 #elif defined(__aarch64__)
     35 struct Mapping39 {
     36   static const uptr kShadowAddr = 0x10000;
     37   static const uptr kUnionTableAddr = 0x1000000000;
     38   static const uptr kAppAddr = 0x7000008000;
     39   static const uptr kShadowMask = ~0x7800000000;
     40 };
     41 
     42 struct Mapping42 {
     43   static const uptr kShadowAddr = 0x10000;
     44   static const uptr kUnionTableAddr = 0x8000000000;
     45   static const uptr kAppAddr = 0x3ff00008000;
     46   static const uptr kShadowMask = ~0x3c000000000;
     47 };
     48 
     49 extern int vmaSize;
     50 # define DFSAN_RUNTIME_VMA 1
     51 #else
     52 # error "DFSan not supported for this platform!"
     53 #endif
     54 
     55 enum MappingType {
     56   MAPPING_SHADOW_ADDR,
     57   MAPPING_UNION_TABLE_ADDR,
     58   MAPPING_APP_ADDR,
     59   MAPPING_SHADOW_MASK
     60 };
     61 
     62 template<typename Mapping, int Type>
     63 uptr MappingImpl(void) {
     64   switch (Type) {
     65     case MAPPING_SHADOW_ADDR: return Mapping::kShadowAddr;
     66     case MAPPING_UNION_TABLE_ADDR: return Mapping::kUnionTableAddr;
     67     case MAPPING_APP_ADDR: return Mapping::kAppAddr;
     68     case MAPPING_SHADOW_MASK: return Mapping::kShadowMask;
     69   }
     70 }
     71 
     72 template<int Type>
     73 uptr MappingArchImpl(void) {
     74 #ifdef __aarch64__
     75   if (vmaSize == 39)
     76     return MappingImpl<Mapping39, Type>();
     77   else
     78     return MappingImpl<Mapping42, Type>();
     79   DCHECK(0);
     80 #else
     81   return MappingImpl<Mapping, Type>();
     82 #endif
     83 }
     84 
     85 ALWAYS_INLINE
     86 uptr ShadowAddr() {
     87   return MappingArchImpl<MAPPING_SHADOW_ADDR>();
     88 }
     89 
     90 ALWAYS_INLINE
     91 uptr UnionTableAddr() {
     92   return MappingArchImpl<MAPPING_UNION_TABLE_ADDR>();
     93 }
     94 
     95 ALWAYS_INLINE
     96 uptr AppAddr() {
     97   return MappingArchImpl<MAPPING_APP_ADDR>();
     98 }
     99 
    100 ALWAYS_INLINE
    101 uptr ShadowMask() {
    102   return MappingArchImpl<MAPPING_SHADOW_MASK>();
    103 }
    104 
    105 }  // namespace __dfsan
    106 
    107 #endif
    108