1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "src/traced/probes/ftrace/test/cpu_reader_support.h"
18
19 #include "perfetto/base/utils.h"
20 #include "src/traced/probes/ftrace/ftrace_procfs.h"
21
22 #include <string.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <unistd.h>
26
27 namespace perfetto {
28 namespace {
29
30 std::map<std::string, std::unique_ptr<ProtoTranslationTable>>* g_tables;
31
GetBinaryDirectory()32 std::string GetBinaryDirectory() {
33 std::string buf(512, '\0');
34 ssize_t rd = readlink("/proc/self/exe", &buf[0], buf.size());
35 if (rd < 0) {
36 PERFETTO_ELOG("Failed to readlink(\"/proc/self/exe\"");
37 return "";
38 }
39 buf.resize(static_cast<size_t>(rd));
40 size_t end = buf.rfind('/');
41 if (end == std::string::npos) {
42 PERFETTO_ELOG("Failed to find directory.");
43 return "";
44 }
45 return buf.substr(0, end + 1);
46 }
47
48 } // namespace
49
GetTable(const std::string & name)50 ProtoTranslationTable* GetTable(const std::string& name) {
51 if (!g_tables)
52 g_tables =
53 new std::map<std::string, std::unique_ptr<ProtoTranslationTable>>();
54 if (!g_tables->count(name)) {
55 std::string path = "src/traced/probes/ftrace/test/data/" + name + "/";
56 struct stat st;
57 if (lstat(path.c_str(), &st) == -1 && errno == ENOENT) {
58 // For OSS fuzz, which does not run in the correct cwd.
59 path = GetBinaryDirectory() + path;
60 }
61 FtraceProcfs ftrace(path);
62 auto table = ProtoTranslationTable::Create(&ftrace, GetStaticEventInfo(),
63 GetStaticCommonFieldsInfo());
64 if (!table)
65 return nullptr;
66 g_tables->emplace(name, std::move(table));
67 }
68 return g_tables->at(name).get();
69 }
70
PageFromXxd(const std::string & text)71 std::unique_ptr<uint8_t[]> PageFromXxd(const std::string& text) {
72 auto buffer = std::unique_ptr<uint8_t[]>(new uint8_t[base::kPageSize]);
73 const char* ptr = text.data();
74 memset(buffer.get(), 0xfa, base::kPageSize);
75 uint8_t* out = buffer.get();
76 while (*ptr != '\0') {
77 if (*(ptr++) != ':')
78 continue;
79 for (int i = 0; i < 8; i++) {
80 PERFETTO_CHECK(text.size() >=
81 static_cast<size_t>((ptr - text.data()) + 5));
82 PERFETTO_CHECK(*(ptr++) == ' ');
83 int n = sscanf(ptr, "%02hhx%02hhx", out, out + 1);
84 PERFETTO_CHECK(n == 2);
85 out += n;
86 ptr += 4;
87 }
88 while (*ptr != '\n')
89 ptr++;
90 }
91 return buffer;
92 }
93
94 } // namespace perfetto
95