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 30 int 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
