1 /*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "async_stack.h"
17
18 #include <pthread.h>
19 #include <threads.h>
20 #include "dfx_param.h"
21 #include "unique_stack_table.h"
22 #include "fp_unwinder.h"
23
24 #include "dfx_log.h"
25
26 #if defined(__aarch64__)
27 static pthread_key_t g_stackidKey;
28 static bool g_init = false;
29
30 extern "C" void SetAsyncStackCallbackFunc(void* func) __attribute__((weak));
InitAsyncStackInner(void)31 static void InitAsyncStackInner(void)
32 {
33 if (SetAsyncStackCallbackFunc == nullptr) {
34 LOGE("%s", "failed to init async stack, could not find SetAsyncStackCallbackFunc.");
35 return;
36 }
37
38 // init unique stack table
39 if (!OHOS::HiviewDFX::UniqueStackTable::Instance()->Init()) {
40 LOGE("%s", "failed to init unique stack table?.");
41 return;
42 }
43
44 if (pthread_key_create(&g_stackidKey, nullptr) == 0) {
45 g_init = true;
46 } else {
47 LOGE("%s", "failed to create key for stackId.");
48 return;
49 }
50
51 // set callback for DfxSignalHandler to read stackId
52 SetAsyncStackCallbackFunc((void*)(&GetStackId));
53 }
54
InitAsyncStack(void)55 static bool InitAsyncStack(void)
56 {
57 static once_flag onceFlag = ONCE_FLAG_INIT;
58 call_once(&onceFlag, InitAsyncStackInner);
59 return g_init;
60 }
61 #endif
62
CollectAsyncStack(void)63 extern "C" uint64_t CollectAsyncStack(void)
64 {
65 #if defined(__aarch64__)
66 if (!InitAsyncStack()) {
67 return 0;
68 }
69 const int32_t maxSize = 16;
70 uintptr_t pcs[maxSize] = {0};
71 int32_t skipFrameNum = 2;
72 size_t sz = static_cast<size_t>(OHOS::HiviewDFX::FpUnwinder::Unwind(pcs, maxSize, skipFrameNum));
73 uint64_t stackId = 0;
74 auto stackIdPtr = reinterpret_cast<OHOS::HiviewDFX::StackId*>(&stackId);
75 OHOS::HiviewDFX::UniqueStackTable::Instance()->PutPcsInTable(stackIdPtr, pcs, sz);
76 return stackId;
77 #else
78 return 0;
79 #endif
80 }
81
SetStackId(uint64_t stackId)82 extern "C" void SetStackId(uint64_t stackId)
83 {
84 #if defined(__aarch64__)
85 if (!InitAsyncStack()) {
86 return;
87 }
88 pthread_setspecific(g_stackidKey, reinterpret_cast<void *>(stackId));
89 #else
90 return;
91 #endif
92 }
93
GetStackId()94 extern "C" uint64_t GetStackId()
95 {
96 #if defined(__aarch64__)
97 if (!InitAsyncStack()) {
98 return 0;
99 }
100 return reinterpret_cast<uint64_t>(pthread_getspecific(g_stackidKey));
101 #else
102 return 0;
103 #endif
104 }