3958f8060a
This cl includes the code to read arm unwind information from a shared library. Bug: 23762183 Test: Passes all unit tests. I can dump the arm unwind information Test: for an arm shared library. Change-Id: I43501ea2eab843b81de8bd5128401dd1971af8d3
121 lines
3.3 KiB
C++
121 lines
3.3 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 <fcntl.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/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "ArmExidx.h"
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#include "Elf.h"
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#include "ElfInterface.h"
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#include "ElfInterfaceArm.h"
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#include "Log.h"
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void DumpArm(ElfInterfaceArm* interface) {
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if (interface == nullptr) {
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printf("No ARM Unwind Information.\n\n");
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return;
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}
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printf("ARM Unwind Information:\n");
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for (const auto& entry : interface->pt_loads()) {
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uint64_t load_bias = entry.second.table_offset;
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printf(" PC Range 0x%" PRIx64 " - 0x%" PRIx64 "\n", entry.second.offset + load_bias,
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entry.second.table_size + load_bias);
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for (auto addr : *interface) {
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std::string name;
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printf(" PC 0x%" PRIx64, addr + load_bias);
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uint64_t func_offset;
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if (interface->GetFunctionName(addr + load_bias + 1, &name, &func_offset) && !name.empty()) {
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printf(" <%s>", name.c_str());
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}
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printf("\n");
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uint64_t entry;
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if (!interface->FindEntry(addr + load_bias, &entry)) {
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printf(" Cannot find entry for address.\n");
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continue;
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}
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ArmExidx arm(nullptr, interface->memory(), nullptr);
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arm.set_log(true);
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arm.set_log_skip_execution(true);
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arm.set_log_indent(2);
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if (!arm.ExtractEntryData(entry)) {
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if (arm.status() != ARM_STATUS_NO_UNWIND) {
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printf(" Error trying to extract data.\n");
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}
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continue;
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}
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if (arm.data()->size() > 0) {
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if (!arm.Eval() && arm.status() != ARM_STATUS_NO_UNWIND) {
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printf(" Error trying to evaluate dwarf data.\n");
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}
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}
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}
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}
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printf("\n");
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}
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int main(int argc, char** argv) {
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if (argc != 2) {
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printf("Need to pass the name of an elf file to the program.\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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if (S_ISDIR(st.st_mode)) {
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printf("%s is a directory.\n", argv[1]);
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return 1;
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}
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// Send all log messages to stdout.
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log_to_stdout(true);
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MemoryFileAtOffset* memory = new MemoryFileAtOffset;
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if (!memory->Init(argv[1], 0)) {
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// Initializatation failed.
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printf("Failed to init\n");
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return 1;
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}
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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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ElfInterface* interface = elf.interface();
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if (elf.machine_type() == EM_ARM) {
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DumpArm(reinterpret_cast<ElfInterfaceArm*>(interface));
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printf("\n");
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}
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return 0;
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}
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