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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_flush_memory() {
     32   FlushShadowMemory();
     33 }
     34 
     35 void __tsan_read16(void *addr) {
     36   MemoryRead(cur_thread(), CALLERPC, (uptr)addr, kSizeLog8);
     37   MemoryRead(cur_thread(), CALLERPC, (uptr)addr + 8, kSizeLog8);
     38 }
     39 
     40 void __tsan_write16(void *addr) {
     41   MemoryWrite(cur_thread(), CALLERPC, (uptr)addr, kSizeLog8);
     42   MemoryWrite(cur_thread(), CALLERPC, (uptr)addr + 8, kSizeLog8);
     43 }
     44 
     45 void __tsan_read16_pc(void *addr, void *pc) {
     46   MemoryRead(cur_thread(), (uptr)pc, (uptr)addr, kSizeLog8);
     47   MemoryRead(cur_thread(), (uptr)pc, (uptr)addr + 8, kSizeLog8);
     48 }
     49 
     50 void __tsan_write16_pc(void *addr, void *pc) {
     51   MemoryWrite(cur_thread(), (uptr)pc, (uptr)addr, kSizeLog8);
     52   MemoryWrite(cur_thread(), (uptr)pc, (uptr)addr + 8, kSizeLog8);
     53 }
     54 
     55 // __tsan_unaligned_read/write calls are emitted by compiler.
     56 
     57 void __tsan_unaligned_read2(const void *addr) {
     58   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 2, false, false);
     59 }
     60 
     61 void __tsan_unaligned_read4(const void *addr) {
     62   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 4, false, false);
     63 }
     64 
     65 void __tsan_unaligned_read8(const void *addr) {
     66   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 8, false, false);
     67 }
     68 
     69 void __tsan_unaligned_read16(const void *addr) {
     70   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 16, false, false);
     71 }
     72 
     73 void __tsan_unaligned_write2(void *addr) {
     74   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 2, true, false);
     75 }
     76 
     77 void __tsan_unaligned_write4(void *addr) {
     78   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 4, true, false);
     79 }
     80 
     81 void __tsan_unaligned_write8(void *addr) {
     82   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 8, true, false);
     83 }
     84 
     85 void __tsan_unaligned_write16(void *addr) {
     86   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 16, true, false);
     87 }
     88 
     89 // __sanitizer_unaligned_load/store are for user instrumentation.
     90 
     91 extern "C" {
     92 SANITIZER_INTERFACE_ATTRIBUTE
     93 u16 __sanitizer_unaligned_load16(const uu16 *addr) {
     94   __tsan_unaligned_read2(addr);
     95   return *addr;
     96 }
     97 
     98 SANITIZER_INTERFACE_ATTRIBUTE
     99 u32 __sanitizer_unaligned_load32(const uu32 *addr) {
    100   __tsan_unaligned_read4(addr);
    101   return *addr;
    102 }
    103 
    104 SANITIZER_INTERFACE_ATTRIBUTE
    105 u64 __sanitizer_unaligned_load64(const uu64 *addr) {
    106   __tsan_unaligned_read8(addr);
    107   return *addr;
    108 }
    109 
    110 SANITIZER_INTERFACE_ATTRIBUTE
    111 void __sanitizer_unaligned_store16(uu16 *addr, u16 v) {
    112   __tsan_unaligned_write2(addr);
    113   *addr = v;
    114 }
    115 
    116 SANITIZER_INTERFACE_ATTRIBUTE
    117 void __sanitizer_unaligned_store32(uu32 *addr, u32 v) {
    118   __tsan_unaligned_write4(addr);
    119   *addr = v;
    120 }
    121 
    122 SANITIZER_INTERFACE_ATTRIBUTE
    123 void __sanitizer_unaligned_store64(uu64 *addr, u64 v) {
    124   __tsan_unaligned_write8(addr);
    125   *addr = v;
    126 }
    127 }  // extern "C"
    128 
    129 void __tsan_acquire(void *addr) {
    130   Acquire(cur_thread(), CALLERPC, (uptr)addr);
    131 }
    132 
    133 void __tsan_release(void *addr) {
    134   Release(cur_thread(), CALLERPC, (uptr)addr);
    135 }
    136