1 /*
2 * Copyright (c) 2022 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 "dfx_hook_utils.h"
17
18 #include <securec.h>
19 #include <stdio.h>
20 #include <unistd.h>
21 #include <stdbool.h>
22
23 #include <libunwind_i.h>
24 #include <libunwind_i-ohos.h>
25 #include <map_info.h>
26
27 #include "dfx_define.h"
28 #include "dfx_log.h"
29
30 #ifdef LOG_DOMAIN
31 #undef LOG_DOMAIN
32 #define LOG_DOMAIN 0xD002D11
33 #endif
34
35 #ifdef LOG_TAG
36 #undef LOG_TAG
37 #define LOG_TAG "DfxFuncHook"
38 #endif
39
40 #define MIN_FRAME 4
41 #define MAX_FRAME 64
42 #define BUF_SZ 512
43
44 static pthread_mutex_t g_backtraceLock = PTHREAD_MUTEX_INITIALIZER;
45
LogBacktrace(void)46 void LogBacktrace(void)
47 {
48 pthread_mutex_lock(&g_backtraceLock);
49 unw_addr_space_t as = NULL;
50 unw_init_local_address_space(&as);
51 if (as == NULL) {
52 pthread_mutex_unlock(&g_backtraceLock);
53 return;
54 }
55
56 unw_context_t context;
57 unw_getcontext(&context);
58
59 unw_cursor_t cursor;
60 unw_init_local_with_as(as, &cursor, &context);
61
62 int index = 0;
63 unw_word_t pc;
64 unw_word_t relPc;
65 unw_word_t prevPc;
66 unw_word_t sz;
67 uint64_t start;
68 uint64_t end;
69 bool shouldContinue = true;
70 while (true) {
71 if (index > MAX_FRAME) {
72 break;
73 }
74
75 if (unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t*)(&pc))) {
76 break;
77 }
78
79 if (index > MIN_FRAME && prevPc == pc) {
80 break;
81 }
82 prevPc = pc;
83
84 relPc = unw_get_rel_pc(&cursor);
85 struct map_info* mapInfo = unw_get_map(&cursor);
86 if (mapInfo == NULL && index > 1) {
87 break;
88 }
89
90 sz = unw_get_previous_instr_sz(&cursor);
91 if (index != 0 && relPc > sz) {
92 relPc -= sz;
93 pc -= sz;
94 }
95
96 char buf[BUF_SZ];
97 (void)memset_s(&buf, sizeof(buf), 0, sizeof(buf));
98 if (unw_get_symbol_info_by_pc(as, pc, BUF_SZ, buf, &start, &end) == 0) {
99 LOGI("#%02d %016p(%016p) %s(%s)\n", index, relPc, pc,
100 mapInfo == NULL ? "Unknown" : mapInfo->path,
101 buf);
102 } else {
103 LOGI("#%02d %016p(%016p) %s\n", index, relPc, pc,
104 mapInfo == NULL ? "Unknown" : mapInfo->path);
105 }
106 index++;
107
108 if (!shouldContinue) {
109 break;
110 }
111
112 int ret = unw_step(&cursor);
113 if (ret == 0) {
114 shouldContinue = false;
115 } else if (ret < 0) {
116 break;
117 }
118 }
119 unw_destroy_local_address_space(as);
120 pthread_mutex_unlock(&g_backtraceLock);
121 }