1 //===-- tsan_interface.cpp ------------------------------------------------===//
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 ThreadSanitizer (TSan), a race detector.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "tsan_interface.h"
14 #include "tsan_interface_ann.h"
15 #include "tsan_rtl.h"
16 #include "sanitizer_common/sanitizer_internal_defs.h"
17 #include "sanitizer_common/sanitizer_ptrauth.h"
18 
19 #define CALLERPC ((uptr)__builtin_return_address(0))
20 
21 using namespace __tsan;
22 
23 void __tsan_init() {
24   cur_thread_init();
25   Initialize(cur_thread());
26 }
27 
28 void __tsan_flush_memory() {
29   FlushShadowMemory();
30 }
31 
32 void __tsan_read16(void *addr) {
33   MemoryRead(cur_thread(), CALLERPC, (uptr)addr, kSizeLog8);
34   MemoryRead(cur_thread(), CALLERPC, (uptr)addr + 8, kSizeLog8);
35 }
36 
37 void __tsan_write16(void *addr) {
38   MemoryWrite(cur_thread(), CALLERPC, (uptr)addr, kSizeLog8);
39   MemoryWrite(cur_thread(), CALLERPC, (uptr)addr + 8, kSizeLog8);
40 }
41 
42 void __tsan_read16_pc(void *addr, void *pc) {
43   MemoryRead(cur_thread(), STRIP_PC(pc), (uptr)addr, kSizeLog8);
44   MemoryRead(cur_thread(), STRIP_PC(pc), (uptr)addr + 8, kSizeLog8);
45 }
46 
47 void __tsan_write16_pc(void *addr, void *pc) {
48   MemoryWrite(cur_thread(), STRIP_PC(pc), (uptr)addr, kSizeLog8);
49   MemoryWrite(cur_thread(), STRIP_PC(pc), (uptr)addr + 8, kSizeLog8);
50 }
51 
52 // __tsan_unaligned_read/write calls are emitted by compiler.
53 
54 void __tsan_unaligned_read2(const void *addr) {
55   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 2, false, false);
56 }
57 
58 void __tsan_unaligned_read4(const void *addr) {
59   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 4, false, false);
60 }
61 
62 void __tsan_unaligned_read8(const void *addr) {
63   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 8, false, false);
64 }
65 
66 void __tsan_unaligned_read16(const void *addr) {
67   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 16, false, false);
68 }
69 
70 void __tsan_unaligned_write2(void *addr) {
71   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 2, true, false);
72 }
73 
74 void __tsan_unaligned_write4(void *addr) {
75   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 4, true, false);
76 }
77 
78 void __tsan_unaligned_write8(void *addr) {
79   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 8, true, false);
80 }
81 
82 void __tsan_unaligned_write16(void *addr) {
83   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 16, true, false);
84 }
85 
86 // __sanitizer_unaligned_load/store are for user instrumentation.
87 
88 extern "C" {
89 SANITIZER_INTERFACE_ATTRIBUTE
90 u16 __sanitizer_unaligned_load16(const uu16 *addr) {
91   __tsan_unaligned_read2(addr);
92   return *addr;
93 }
94 
95 SANITIZER_INTERFACE_ATTRIBUTE
96 u32 __sanitizer_unaligned_load32(const uu32 *addr) {
97   __tsan_unaligned_read4(addr);
98   return *addr;
99 }
100 
101 SANITIZER_INTERFACE_ATTRIBUTE
102 u64 __sanitizer_unaligned_load64(const uu64 *addr) {
103   __tsan_unaligned_read8(addr);
104   return *addr;
105 }
106 
107 SANITIZER_INTERFACE_ATTRIBUTE
108 void __sanitizer_unaligned_store16(uu16 *addr, u16 v) {
109   __tsan_unaligned_write2(addr);
110   *addr = v;
111 }
112 
113 SANITIZER_INTERFACE_ATTRIBUTE
114 void __sanitizer_unaligned_store32(uu32 *addr, u32 v) {
115   __tsan_unaligned_write4(addr);
116   *addr = v;
117 }
118 
119 SANITIZER_INTERFACE_ATTRIBUTE
120 void __sanitizer_unaligned_store64(uu64 *addr, u64 v) {
121   __tsan_unaligned_write8(addr);
122   *addr = v;
123 }
124 
125 SANITIZER_INTERFACE_ATTRIBUTE
126 void *__tsan_get_current_fiber() {
127   return cur_thread();
128 }
129 
130 SANITIZER_INTERFACE_ATTRIBUTE
131 void *__tsan_create_fiber(unsigned flags) {
132   return FiberCreate(cur_thread(), CALLERPC, flags);
133 }
134 
135 SANITIZER_INTERFACE_ATTRIBUTE
136 void __tsan_destroy_fiber(void *fiber) {
137   FiberDestroy(cur_thread(), CALLERPC, static_cast<ThreadState *>(fiber));
138 }
139 
140 SANITIZER_INTERFACE_ATTRIBUTE
141 void __tsan_switch_to_fiber(void *fiber, unsigned flags) {
142   FiberSwitch(cur_thread(), CALLERPC, static_cast<ThreadState *>(fiber), flags);
143 }
144 
145 SANITIZER_INTERFACE_ATTRIBUTE
146 void __tsan_set_fiber_name(void *fiber, const char *name) {
147   ThreadSetName(static_cast<ThreadState *>(fiber), name);
148 }
149 }  // extern "C"
150 
151 void __tsan_acquire(void *addr) {
152   Acquire(cur_thread(), CALLERPC, (uptr)addr);
153 }
154 
155 void __tsan_release(void *addr) {
156   Release(cur_thread(), CALLERPC, (uptr)addr);
157 }
158