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      1 //===-- tsan_interface.cc -------------------------------------------------===//
      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 //===----------------------------------------------------------------------===//
     13 
     14 #include "tsan_interface.h"
     15 #include "tsan_interface_ann.h"
     16 #include "tsan_rtl.h"
     17 #include "sanitizer_common/sanitizer_internal_defs.h"
     18 
     19 #define CALLERPC ((uptr)__builtin_return_address(0))
     20 
     21 using namespace __tsan;  // NOLINT
     22 
     23 typedef u16 uint16_t;
     24 typedef u32 uint32_t;
     25 typedef u64 uint64_t;
     26 
     27 void __tsan_init() {
     28   Initialize(cur_thread());
     29 }
     30 
     31 void __tsan_read16(void *addr) {
     32   MemoryRead(cur_thread(), CALLERPC, (uptr)addr, kSizeLog8);
     33   MemoryRead(cur_thread(), CALLERPC, (uptr)addr + 8, kSizeLog8);
     34 }
     35 
     36 void __tsan_write16(void *addr) {
     37   MemoryWrite(cur_thread(), CALLERPC, (uptr)addr, kSizeLog8);
     38   MemoryWrite(cur_thread(), CALLERPC, (uptr)addr + 8, kSizeLog8);
     39 }
     40 
     41 // __tsan_unaligned_read/write calls are emitted by compiler.
     42 
     43 void __tsan_unaligned_read2(const void *addr) {
     44   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 2, false, false);
     45 }
     46 
     47 void __tsan_unaligned_read4(const void *addr) {
     48   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 4, false, false);
     49 }
     50 
     51 void __tsan_unaligned_read8(const void *addr) {
     52   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 8, false, false);
     53 }
     54 
     55 void __tsan_unaligned_read16(const void *addr) {
     56   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 16, false, false);
     57 }
     58 
     59 void __tsan_unaligned_write2(void *addr) {
     60   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 2, true, false);
     61 }
     62 
     63 void __tsan_unaligned_write4(void *addr) {
     64   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 4, true, false);
     65 }
     66 
     67 void __tsan_unaligned_write8(void *addr) {
     68   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 8, true, false);
     69 }
     70 
     71 void __tsan_unaligned_write16(void *addr) {
     72   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 16, true, false);
     73 }
     74 
     75 // __sanitizer_unaligned_load/store are for user instrumentation.
     76 
     77 extern "C" {
     78 SANITIZER_INTERFACE_ATTRIBUTE
     79 u16 __sanitizer_unaligned_load16(const uu16 *addr) {
     80   __tsan_unaligned_read2(addr);
     81   return *addr;
     82 }
     83 
     84 SANITIZER_INTERFACE_ATTRIBUTE
     85 u32 __sanitizer_unaligned_load32(const uu32 *addr) {
     86   __tsan_unaligned_read4(addr);
     87   return *addr;
     88 }
     89 
     90 SANITIZER_INTERFACE_ATTRIBUTE
     91 u64 __sanitizer_unaligned_load64(const uu64 *addr) {
     92   __tsan_unaligned_read8(addr);
     93   return *addr;
     94 }
     95 
     96 SANITIZER_INTERFACE_ATTRIBUTE
     97 void __sanitizer_unaligned_store16(uu16 *addr, u16 v) {
     98   __tsan_unaligned_write2(addr);
     99   *addr = v;
    100 }
    101 
    102 SANITIZER_INTERFACE_ATTRIBUTE
    103 void __sanitizer_unaligned_store32(uu32 *addr, u32 v) {
    104   __tsan_unaligned_write4(addr);
    105   *addr = v;
    106 }
    107 
    108 SANITIZER_INTERFACE_ATTRIBUTE
    109 void __sanitizer_unaligned_store64(uu64 *addr, u64 v) {
    110   __tsan_unaligned_write8(addr);
    111   *addr = v;
    112 }
    113 }  // extern "C"
    114 
    115 void __tsan_acquire(void *addr) {
    116   Acquire(cur_thread(), CALLERPC, (uptr)addr);
    117 }
    118 
    119 void __tsan_release(void *addr) {
    120   Release(cur_thread(), CALLERPC, (uptr)addr);
    121 }
    122