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      1 //===-- tsan_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 ThreadSanitizer (TSan), a race detector.
     11 //
     12 // Platform-specific code.
     13 //===----------------------------------------------------------------------===//
     14 
     15 #ifndef TSAN_PLATFORM_H
     16 #define TSAN_PLATFORM_H
     17 
     18 #include "tsan_rtl.h"
     19 
     20 #if __LP64__
     21 namespace __tsan {
     22 
     23 #if defined(TSAN_GO)
     24 static const uptr kLinuxAppMemBeg = 0x000000000000ULL;
     25 static const uptr kLinuxAppMemEnd = 0x00fcffffffffULL;
     26 static const uptr kLinuxShadowMsk = 0x100000000000ULL;
     27 // TSAN_COMPAT_SHADOW is intended for COMPAT virtual memory layout,
     28 // when memory addresses are of the 0x2axxxxxxxxxx form.
     29 // The option is enabled with 'setarch x86_64 -L'.
     30 #elif defined(TSAN_COMPAT_SHADOW) && TSAN_COMPAT_SHADOW
     31 static const uptr kLinuxAppMemBeg = 0x290000000000ULL;
     32 static const uptr kLinuxAppMemEnd = 0x7fffffffffffULL;
     33 #else
     34 static const uptr kLinuxAppMemBeg = 0x7cf000000000ULL;
     35 static const uptr kLinuxAppMemEnd = 0x7fffffffffffULL;
     36 #endif
     37 
     38 static const uptr kLinuxAppMemMsk = 0x7c0000000000ULL;
     39 
     40 // This has to be a macro to allow constant initialization of constants below.
     41 #ifndef TSAN_GO
     42 #define MemToShadow(addr) \
     43     (((addr) & ~(kLinuxAppMemMsk | (kShadowCell - 1))) * kShadowCnt)
     44 #else
     45 #define MemToShadow(addr) \
     46     ((((addr) & ~(kShadowCell - 1)) * kShadowCnt) | kLinuxShadowMsk)
     47 #endif
     48 
     49 static const uptr kLinuxShadowBeg = MemToShadow(kLinuxAppMemBeg);
     50 static const uptr kLinuxShadowEnd =
     51   MemToShadow(kLinuxAppMemEnd) | (kPageSize - 1);
     52 
     53 static inline bool IsAppMem(uptr mem) {
     54   return mem >= kLinuxAppMemBeg && mem <= kLinuxAppMemEnd;
     55 }
     56 
     57 static inline bool IsShadowMem(uptr mem) {
     58   return mem >= kLinuxShadowBeg && mem <= kLinuxShadowEnd;
     59 }
     60 
     61 static inline uptr ShadowToMem(uptr shadow) {
     62   CHECK(IsShadowMem(shadow));
     63 #ifdef TSAN_GO
     64   return (shadow & ~kLinuxShadowMsk) / kShadowCnt;
     65 #else
     66   return (shadow / kShadowCnt) | kLinuxAppMemMsk;
     67 #endif
     68 }
     69 
     70 // For COMPAT mapping returns an alternative address
     71 // that mapped to the same shadow address.
     72 // COMPAT mapping is not quite one-to-one.
     73 static inline uptr AlternativeAddress(uptr addr) {
     74 #if defined(TSAN_COMPAT_SHADOW) && TSAN_COMPAT_SHADOW
     75   return (addr & ~kLinuxAppMemMsk) | 0x280000000000ULL;
     76 #else
     77   return 0;
     78 #endif
     79 }
     80 
     81 uptr GetShadowMemoryConsumption();
     82 void FlushShadowMemory();
     83 
     84 const char *InitializePlatform();
     85 void FinalizePlatform();
     86 
     87 void internal_start_thread(void(*func)(void*), void *arg);
     88 
     89 // Says whether the addr relates to a global var.
     90 // Guesses with high probability, may yield both false positives and negatives.
     91 bool IsGlobalVar(uptr addr);
     92 uptr GetTlsSize();
     93 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
     94                           uptr *tls_addr, uptr *tls_size);
     95 
     96 }  // namespace __tsan
     97 
     98 #else  // __LP64__
     99 # error "Only 64-bit is supported"
    100 #endif
    101 
    102 #endif  // TSAN_PLATFORM_H
    103