1 /*
2 * Copyright (C) 2016 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 <elf.h>
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <inttypes.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <sys/mman.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <unistd.h>
27
28 #include "ArmExidx.h"
29 #include "Elf.h"
30 #include "ElfInterface.h"
31 #include "ElfInterfaceArm.h"
32 #include "Log.h"
33
DumpArm(ElfInterfaceArm * interface)34 void DumpArm(ElfInterfaceArm* interface) {
35 if (interface == nullptr) {
36 printf("No ARM Unwind Information.\n\n");
37 return;
38 }
39
40 printf("ARM Unwind Information:\n");
41 for (const auto& entry : interface->pt_loads()) {
42 uint64_t load_bias = entry.second.table_offset;
43 printf(" PC Range 0x%" PRIx64 " - 0x%" PRIx64 "\n", entry.second.offset + load_bias,
44 entry.second.table_size + load_bias);
45 for (auto addr : *interface) {
46 std::string name;
47 printf(" PC 0x%" PRIx64, addr + load_bias);
48 uint64_t func_offset;
49 if (interface->GetFunctionName(addr + load_bias + 1, &name, &func_offset) && !name.empty()) {
50 printf(" <%s>", name.c_str());
51 }
52 printf("\n");
53 uint64_t entry;
54 if (!interface->FindEntry(addr + load_bias, &entry)) {
55 printf(" Cannot find entry for address.\n");
56 continue;
57 }
58 ArmExidx arm(nullptr, interface->memory(), nullptr);
59 arm.set_log(true);
60 arm.set_log_skip_execution(true);
61 arm.set_log_indent(2);
62 if (!arm.ExtractEntryData(entry)) {
63 if (arm.status() != ARM_STATUS_NO_UNWIND) {
64 printf(" Error trying to extract data.\n");
65 }
66 continue;
67 }
68 if (arm.data()->size() > 0) {
69 if (!arm.Eval() && arm.status() != ARM_STATUS_NO_UNWIND) {
70 printf(" Error trying to evaluate dwarf data.\n");
71 }
72 }
73 }
74 }
75 printf("\n");
76 }
77
main(int argc,char ** argv)78 int main(int argc, char** argv) {
79 if (argc != 2) {
80 printf("Need to pass the name of an elf file to the program.\n");
81 return 1;
82 }
83
84 struct stat st;
85 if (stat(argv[1], &st) == -1) {
86 printf("Cannot stat %s: %s\n", argv[1], strerror(errno));
87 return 1;
88 }
89 if (!S_ISREG(st.st_mode)) {
90 printf("%s is not a regular file.\n", argv[1]);
91 return 1;
92 }
93 if (S_ISDIR(st.st_mode)) {
94 printf("%s is a directory.\n", argv[1]);
95 return 1;
96 }
97
98 // Send all log messages to stdout.
99 log_to_stdout(true);
100
101 MemoryFileAtOffset* memory = new MemoryFileAtOffset;
102 if (!memory->Init(argv[1], 0)) {
103 // Initializatation failed.
104 printf("Failed to init\n");
105 return 1;
106 }
107
108 Elf elf(memory);
109 if (!elf.Init() || !elf.valid()) {
110 printf("%s is not a valid elf file.\n", argv[1]);
111 return 1;
112 }
113
114 ElfInterface* interface = elf.interface();
115 if (elf.machine_type() == EM_ARM) {
116 DumpArm(reinterpret_cast<ElfInterfaceArm*>(interface));
117 printf("\n");
118 }
119
120 return 0;
121 }
122