3f805ac3f8
- Add a method to get the max size of an elf file by reading the section header offset + size. This will properly map an elf file embedded into an apk, instead of just mapping in what is done by the dynamic linker. It does assume that the section headers are at the end of the elf file. - Add new tests for the above functionality. - Update the unwind_symbols tool to take an address for finding a function instead of dumping the entire symbol table. Bug: 23762183 Test: Unit tests pass, unwind through the camera process and verify Test: the GoogleCamera.apk shows some function names. Change-Id: I00c021680fe1d43b60d652bf91bbf6667d9617be
126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <elf.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <unwindstack/Elf.h>
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#include <unwindstack/Log.h>
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#include <unwindstack/Memory.h>
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int main(int argc, char** argv) {
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if (argc != 2 && argc != 3) {
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printf("Usage: unwind_symbols <ELF_FILE> [<FUNC_ADDRESS>]\n");
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printf(" Dump all function symbols in ELF_FILE. If FUNC_ADDRESS is\n");
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printf(" specified, then get the function at that address.\n");
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printf(" FUNC_ADDRESS must be a hex number.\n");
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return 1;
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}
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struct stat st;
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if (stat(argv[1], &st) == -1) {
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printf("Cannot stat %s: %s\n", argv[1], strerror(errno));
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return 1;
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}
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if (!S_ISREG(st.st_mode)) {
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printf("%s is not a regular file.\n", argv[1]);
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return 1;
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}
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uint64_t func_addr;
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if (argc == 3) {
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char* name;
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func_addr = strtoull(argv[2], &name, 16);
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if (*name != '\0') {
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printf("%s is not a hex number.\n", argv[2]);
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return 1;
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}
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}
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// Send all log messages to stdout.
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unwindstack::log_to_stdout(true);
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unwindstack::MemoryFileAtOffset* memory = new unwindstack::MemoryFileAtOffset;
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if (!memory->Init(argv[1], 0)) {
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printf("Failed to init\n");
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return 1;
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}
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unwindstack::Elf elf(memory);
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if (!elf.Init() || !elf.valid()) {
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printf("%s is not a valid elf file.\n", argv[1]);
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return 1;
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}
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switch (elf.machine_type()) {
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case EM_ARM:
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printf("ABI: arm\n");
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break;
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case EM_AARCH64:
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printf("ABI: arm64\n");
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break;
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case EM_386:
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printf("ABI: x86\n");
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break;
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case EM_X86_64:
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printf("ABI: x86_64\n");
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break;
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default:
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printf("ABI: unknown\n");
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return 1;
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}
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std::string name;
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uint64_t load_bias = elf.interface()->load_bias();
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if (argc == 3) {
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std::string cur_name;
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uint64_t func_offset;
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if (!elf.GetFunctionName(func_addr, &cur_name, &func_offset)) {
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printf("No known function at 0x%" PRIx64 "\n", func_addr);
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return 1;
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}
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printf("<0x%" PRIx64 ">", func_addr - func_offset);
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if (func_offset != 0) {
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printf("+%" PRId64, func_offset);
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}
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printf(": %s\n", cur_name.c_str());
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return 0;
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}
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// This is a crude way to get the symbols in order.
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for (const auto& entry : elf.interface()->pt_loads()) {
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uint64_t start = entry.second.offset + load_bias;
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uint64_t end = entry.second.table_size + load_bias;
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for (uint64_t addr = start; addr < end; addr += 4) {
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std::string cur_name;
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uint64_t func_offset;
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if (elf.GetFunctionName(addr, &cur_name, &func_offset)) {
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if (cur_name != name) {
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printf("<0x%" PRIx64 "> Function: %s\n", addr - func_offset, cur_name.c_str());
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}
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name = cur_name;
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}
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}
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}
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return 0;
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}
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