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/ext/base/utils.h"
20 #include "src/base/test/utils.h"
21 #include "src/traced/probes/ftrace/ftrace_procfs.h"
22
23 #include <string.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27
28 namespace perfetto {
29 namespace {
30
31 std::map<std::string, std::unique_ptr<ProtoTranslationTable>>* g_tables;
32
33 } // namespace
34
GetTable(const std::string & name)35 ProtoTranslationTable* GetTable(const std::string& name) {
36 if (!g_tables)
37 g_tables =
38 new std::map<std::string, std::unique_ptr<ProtoTranslationTable>>();
39 if (!g_tables->count(name)) {
40 std::string path = "src/traced/probes/ftrace/test/data/" + name + "/";
41 struct stat st;
42 if (lstat(path.c_str(), &st) == -1 && errno == ENOENT) {
43 // For OSS fuzz, which does not run in the correct cwd.
44 path = base::GetTestDataPath(path);
45 }
46 FtraceProcfs ftrace(path);
47 auto table = ProtoTranslationTable::Create(&ftrace, GetStaticEventInfo(),
48 GetStaticCommonFieldsInfo());
49 if (!table)
50 return nullptr;
51 g_tables->emplace(name, std::move(table));
52 }
53 return g_tables->at(name).get();
54 }
55
PageFromXxd(const std::string & text)56 std::unique_ptr<uint8_t[]> PageFromXxd(const std::string& text) {
57 auto buffer = std::unique_ptr<uint8_t[]>(new uint8_t[base::kPageSize]);
58 const char* ptr = text.data();
59 memset(buffer.get(), 0xfa, base::kPageSize);
60 uint8_t* out = buffer.get();
61 while (*ptr != '\0') {
62 if (*(ptr++) != ':')
63 continue;
64 for (int i = 0; i < 8; i++) {
65 PERFETTO_CHECK(text.size() >=
66 static_cast<size_t>((ptr - text.data()) + 5));
67 PERFETTO_CHECK(*(ptr++) == ' ');
68 int n = sscanf(ptr, "%02hhx%02hhx", out, out + 1);
69 PERFETTO_CHECK(n == 2);
70 out += n;
71 ptr += 4;
72 }
73 while (*ptr != '\n')
74 ptr++;
75 }
76 return buffer;
77 }
78
79 } // namespace perfetto
80