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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <elf.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <unwindstack/DwarfSection.h>
#include <unwindstack/DwarfStructs.h>
#include <unwindstack/Elf.h>
#include <unwindstack/ElfInterface.h>
#include <unwindstack/Log.h>
#include "ArmExidx.h"
#include "ElfInterfaceArm.h"
namespace unwindstack {
void DumpArm(ElfInterfaceArm* interface) {
if (interface == nullptr) {
printf("No ARM Unwind Information.\n\n");
return;
}
printf("ARM Unwind Information:\n");
for (const auto& entry : interface->pt_loads()) {
uint64_t load_bias = entry.second.table_offset;
printf(" PC Range 0x%" PRIx64 " - 0x%" PRIx64 "\n", entry.second.offset + load_bias,
entry.second.table_size + load_bias);
for (auto addr : *interface) {
std::string name;
printf(" PC 0x%" PRIx64, addr + load_bias);
uint64_t func_offset;
uint64_t pc = addr + load_bias;
if (interface->GetFunctionName(pc, load_bias, &name, &func_offset) && !name.empty()) {
printf(" <%s>", name.c_str());
}
printf("\n");
uint64_t entry;
if (!interface->FindEntry(pc, &entry)) {
printf(" Cannot find entry for address.\n");
continue;
}
ArmExidx arm(nullptr, interface->memory(), nullptr);
arm.set_log(true);
arm.set_log_skip_execution(true);
arm.set_log_indent(2);
if (!arm.ExtractEntryData(entry)) {
if (arm.status() != ARM_STATUS_NO_UNWIND) {
printf(" Error trying to extract data.\n");
}
continue;
}
if (arm.data()->size() > 0) {
if (!arm.Eval() && arm.status() != ARM_STATUS_NO_UNWIND) {
printf(" Error trying to evaluate dwarf data.\n");
}
}
}
}
printf("\n");
}
void DumpDwarfSection(ElfInterface* interface, DwarfSection* section, uint64_t load_bias) {
for (const DwarfFde* fde : *section) {
// Sometimes there are entries that have empty length, skip those since
// they don't contain any interesting information.
if (fde == nullptr || fde->pc_start == fde->pc_end) {
continue;
}
printf("\n PC 0x%" PRIx64, fde->pc_start + load_bias);
std::string name;
uint64_t func_offset;
if (interface->GetFunctionName(fde->pc_start, load_bias, &name, &func_offset) && !name.empty()) {
printf(" <%s>", name.c_str());
}
printf("\n");
if (!section->Log(2, UINT64_MAX, load_bias, fde)) {
printf("Failed to process cfa information for entry at 0x%" PRIx64 "\n", fde->pc_start);
}
}
}
int GetElfInfo(const char* file, uint64_t offset) {
// Send all log messages to stdout.
log_to_stdout(true);
MemoryFileAtOffset* memory = new MemoryFileAtOffset;
if (!memory->Init(file, offset)) {
// Initializatation failed.
printf("Failed to init\n");
return 1;
}
Elf elf(memory);
if (!elf.Init(true) || !elf.valid()) {
printf("%s is not a valid elf file.\n", file);
return 1;
}
std::string soname;
if (elf.GetSoname(&soname)) {
printf("Soname: %s\n", soname.c_str());
}
ElfInterface* interface = elf.interface();
if (elf.machine_type() == EM_ARM) {
DumpArm(reinterpret_cast<ElfInterfaceArm*>(interface));
printf("\n");
}
if (interface->eh_frame() != nullptr) {
printf("eh_frame information:\n");
DumpDwarfSection(interface, interface->eh_frame(), elf.GetLoadBias());
printf("\n");
} else {
printf("\nno eh_frame information\n");
}
if (interface->debug_frame() != nullptr) {
printf("\ndebug_frame information:\n");
DumpDwarfSection(interface, interface->debug_frame(), elf.GetLoadBias());
printf("\n");
} else {
printf("\nno debug_frame information\n");
}
// If there is a gnu_debugdata interface, dump the information for that.
ElfInterface* gnu_debugdata_interface = elf.gnu_debugdata_interface();
if (gnu_debugdata_interface != nullptr) {
if (gnu_debugdata_interface->eh_frame() != nullptr) {
printf("\ngnu_debugdata (eh_frame):\n");
DumpDwarfSection(gnu_debugdata_interface, gnu_debugdata_interface->eh_frame(), 0);
printf("\n");
}
if (gnu_debugdata_interface->debug_frame() != nullptr) {
printf("\ngnu_debugdata (debug_frame):\n");
DumpDwarfSection(gnu_debugdata_interface, gnu_debugdata_interface->debug_frame(), 0);
printf("\n");
}
} else {
printf("\nno valid gnu_debugdata information\n");
}
return 0;
}
} // namespace unwindstack
int main(int argc, char** argv) {
if (argc != 2 && argc != 3) {
printf("Usage: unwind_info ELF_FILE [OFFSET]\n");
printf(" ELF_FILE\n");
printf(" The path to an elf file.\n");
printf(" OFFSET\n");
printf(" Use the offset into the ELF file as the beginning of the elf.\n");
return 1;
}
struct stat st;
if (stat(argv[1], &st) == -1) {
printf("Cannot stat %s: %s\n", argv[1], strerror(errno));
return 1;
}
if (!S_ISREG(st.st_mode)) {
printf("%s is not a regular file.\n", argv[1]);
return 1;
}
uint64_t offset = 0;
if (argc == 3) {
char* end;
offset = strtoull(argv[2], &end, 16);
if (*end != '\0') {
printf("Malformed OFFSET value: %s\n", argv[2]);
return 1;
}
}
return unwindstack::GetElfInfo(argv[1], offset);
}
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