beae42bc7f
The dynamic section contained an address, not an offset into the elf file to indicate where the soname exists. Changed to use the strtab entries in the section headers to map this address to the actual offset. Refactor the soname test a bit to make it easier to verify the code. Bug: 73499044 Test: Passes new unit tests. Test: Ran unwind_info on the failing shared elf and verified the soinfo Test: is correct. Change-Id: I16ba148389bcb9aadd3566fb442dac27f89fe894
131 lines
3.5 KiB
C++
131 lines
3.5 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(true) || !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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std::string soname;
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if (elf.GetSoname(&soname)) {
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printf("Soname: %s\n\n", soname.c_str());
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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.GetLoadBias();
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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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