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 <inttypes.h>
20#include <stdio.h>
21#include <string.h>
22#include <sys/stat.h>
23#include <sys/types.h>
24#include <unistd.h>
25
26#include <unwindstack/Elf.h>
27#include <unwindstack/Log.h>
28#include <unwindstack/Memory.h>
29
30int main(int argc, char** argv) {
31  if (argc != 2 && argc != 3) {
32    printf("Usage: unwind_symbols <ELF_FILE> [<FUNC_ADDRESS>]\n");
33    printf("  Dump all function symbols in ELF_FILE. If FUNC_ADDRESS is\n");
34    printf("  specified, then get the function at that address.\n");
35    printf("  FUNC_ADDRESS must be a hex number.\n");
36    return 1;
37  }
38
39  struct stat st;
40  if (stat(argv[1], &st) == -1) {
41    printf("Cannot stat %s: %s\n", argv[1], strerror(errno));
42    return 1;
43  }
44  if (!S_ISREG(st.st_mode)) {
45    printf("%s is not a regular file.\n", argv[1]);
46    return 1;
47  }
48
49  uint64_t func_addr;
50  if (argc == 3) {
51    char* name;
52    func_addr = strtoull(argv[2], &name, 16);
53    if (*name != '\0') {
54      printf("%s is not a hex number.\n", argv[2]);
55      return 1;
56    }
57  }
58
59  // Send all log messages to stdout.
60  unwindstack::log_to_stdout(true);
61
62  unwindstack::MemoryFileAtOffset* memory = new unwindstack::MemoryFileAtOffset;
63  if (!memory->Init(argv[1], 0)) {
64    printf("Failed to init\n");
65    return 1;
66  }
67
68  unwindstack::Elf elf(memory);
69  if (!elf.Init(true) || !elf.valid()) {
70    printf("%s is not a valid elf file.\n", argv[1]);
71    return 1;
72  }
73
74  std::string soname;
75  if (elf.GetSoname(&soname)) {
76    printf("Soname: %s\n\n", soname.c_str());
77  }
78
79  switch (elf.machine_type()) {
80    case EM_ARM:
81      printf("ABI: arm\n");
82      break;
83    case EM_AARCH64:
84      printf("ABI: arm64\n");
85      break;
86    case EM_386:
87      printf("ABI: x86\n");
88      break;
89    case EM_X86_64:
90      printf("ABI: x86_64\n");
91      break;
92    default:
93      printf("ABI: unknown\n");
94      return 1;
95  }
96
97  std::string name;
98  uint64_t load_bias = elf.GetLoadBias();
99  if (argc == 3) {
100    std::string cur_name;
101    uint64_t func_offset;
102    if (!elf.GetFunctionName(func_addr, &cur_name, &func_offset)) {
103      printf("No known function at 0x%" PRIx64 "\n", func_addr);
104      return 1;
105    }
106    printf("<0x%" PRIx64 ">", func_addr - func_offset);
107    if (func_offset != 0) {
108      printf("+%" PRId64, func_offset);
109    }
110    printf(": %s\n", cur_name.c_str());
111    return 0;
112  }
113
114  // This is a crude way to get the symbols in order.
115  for (const auto& entry : elf.interface()->pt_loads()) {
116    uint64_t start = entry.second.offset + load_bias;
117    uint64_t end = entry.second.table_size + load_bias;
118    for (uint64_t addr = start; addr < end; addr += 4) {
119      std::string cur_name;
120      uint64_t func_offset;
121      if (elf.GetFunctionName(addr, &cur_name, &func_offset)) {
122        if (cur_name != name) {
123          printf("<0x%" PRIx64 "> Function: %s\n", addr - func_offset, cur_name.c_str());
124        }
125        name = cur_name;
126      }
127    }
128  }
129
130  return 0;
131}
132