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// Copyright (c) 2014 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// microdump.cc: A microdump reader.
//
// See microdump.h for documentation.
#include "google_breakpad/processor/microdump.h"
#include <stdio.h>
#include <string.h>
#include <memory>
#include <sstream>
#include <string>
#include <vector>
#include "google_breakpad/common/minidump_cpu_arm.h"
#include "google_breakpad/processor/code_module.h"
#include "processor/basic_code_module.h"
#include "processor/linked_ptr.h"
#include "processor/logging.h"
#include "processor/range_map-inl.h"
namespace {
static const char kGoogleBreakpadKey[] = "google-breakpad";
static const char kMicrodumpBegin[] = "-----BEGIN BREAKPAD MICRODUMP-----";
static const char kMicrodumpEnd[] = "-----END BREAKPAD MICRODUMP-----";
static const char kOsKey[] = ": O ";
static const char kCpuKey[] = ": C ";
static const char kMmapKey[] = ": M ";
static const char kStackKey[] = ": S ";
static const char kStackFirstLineKey[] = ": S 0 ";
static const char kArmArchitecture[] = "arm";
static const char kArm64Architecture[] = "arm64";
template<typename T>
T HexStrToL(const string& str) {
uint64_t res = 0;
std::istringstream ss(str);
ss >> std::hex >> res;
return static_cast<T>(res);
}
std::vector<uint8_t> ParseHexBuf(const string& str) {
std::vector<uint8_t> buf;
for (size_t i = 0; i < str.length(); i += 2) {
buf.push_back(HexStrToL<uint8_t>(str.substr(i, 2)));
}
return buf;
}
} // namespace
namespace google_breakpad {
//
// MicrodumpModules
//
void MicrodumpModules::Add(const CodeModule* module) {
linked_ptr<const CodeModule> module_ptr(module);
if (!map_->StoreRange(module->base_address(), module->size(), module_ptr)) {
BPLOG(ERROR) << "Module " << module->code_file() <<
" could not be stored";
}
}
//
// MicrodumpContext
//
void MicrodumpContext::SetContextARM(MDRawContextARM* arm) {
DumpContext::SetContextFlags(MD_CONTEXT_ARM);
DumpContext::SetContextARM(arm);
valid_ = true;
}
void MicrodumpContext::SetContextARM64(MDRawContextARM64* arm64) {
DumpContext::SetContextFlags(MD_CONTEXT_ARM64);
DumpContext::SetContextARM64(arm64);
valid_ = true;
}
//
// MicrodumpMemoryRegion
//
MicrodumpMemoryRegion::MicrodumpMemoryRegion() : base_address_(0) { }
void MicrodumpMemoryRegion::Init(uint64_t base_address,
const std::vector<uint8_t>& contents) {
base_address_ = base_address;
contents_ = contents;
}
uint64_t MicrodumpMemoryRegion::GetBase() const { return base_address_; }
uint32_t MicrodumpMemoryRegion::GetSize() const { return contents_.size(); }
bool MicrodumpMemoryRegion::GetMemoryAtAddress(uint64_t address,
uint8_t* value) const {
return GetMemoryLittleEndian(address, value);
}
bool MicrodumpMemoryRegion::GetMemoryAtAddress(uint64_t address,
uint16_t* value) const {
return GetMemoryLittleEndian(address, value);
}
bool MicrodumpMemoryRegion::GetMemoryAtAddress(uint64_t address,
uint32_t* value) const {
return GetMemoryLittleEndian(address, value);
}
bool MicrodumpMemoryRegion::GetMemoryAtAddress(uint64_t address,
uint64_t* value) const {
return GetMemoryLittleEndian(address, value);
}
template<typename ValueType>
bool MicrodumpMemoryRegion::GetMemoryLittleEndian(uint64_t address,
ValueType* value) const {
if (address < base_address_ ||
address - base_address_ + sizeof(ValueType) > contents_.size())
return false;
ValueType v = 0;
uint64_t start = address - base_address_;
// The loop condition is odd, but it's correct for size_t.
for (size_t i = sizeof(ValueType) - 1; i < sizeof(ValueType); i--)
v = (v << 8) | static_cast<uint8_t>(contents_[start + i]);
*value = v;
return true;
}
void MicrodumpMemoryRegion::Print() const {
// Not reached, just needed to honor the base class contract.
assert(false);
}
//
// Microdump
//
Microdump::Microdump(const string& contents)
: context_(new MicrodumpContext()),
stack_region_(new MicrodumpMemoryRegion()),
modules_(new MicrodumpModules()),
system_info_(new SystemInfo()) {
assert(!contents.empty());
bool in_microdump = false;
string line;
uint64_t stack_start = 0;
std::vector<uint8_t> stack_content;
string arch;
std::istringstream stream(contents);
while (std::getline(stream, line)) {
if (line.find(kGoogleBreakpadKey) == string::npos) {
continue;
}
if (line.find(kMicrodumpBegin) != string::npos) {
in_microdump = true;
continue;
}
if (line.find(kMicrodumpEnd) != string::npos) {
break;
}
if (!in_microdump) {
continue;
}
size_t pos;
if ((pos = line.find(kOsKey)) != string::npos) {
string os_str(line, pos + strlen(kOsKey));
std::istringstream os_tokens(os_str);
string os_id;
string num_cpus;
string os_version;
// This reflect the actual HW arch and might not match the arch emulated
// for the execution (e.g., running a 32-bit binary on a 64-bit cpu).
string hw_arch;
os_tokens >> os_id;
os_tokens >> arch;
os_tokens >> num_cpus;
os_tokens >> hw_arch;
std::getline(os_tokens, os_version);
os_version.erase(0, 1); // remove leading space.
system_info_->cpu = hw_arch;
system_info_->cpu_count = HexStrToL<uint8_t>(num_cpus);
system_info_->os_version = os_version;
if (os_id == "L") {
system_info_->os = "Linux";
system_info_->os_short = "linux";
} else if (os_id == "A") {
system_info_->os = "Android";
system_info_->os_short = "android";
}
// OS line also contains release and version for future use.
} else if ((pos = line.find(kStackKey)) != string::npos) {
if (line.find(kStackFirstLineKey) != string::npos) {
// The first line of the stack (S 0 stack header) provides the value of
// the stack pointer, the start address of the stack being dumped and
// the length of the stack. We could use it in future to double check
// that we received all the stack as expected.
continue;
}
string stack_str(line, pos + strlen(kStackKey));
std::istringstream stack_tokens(stack_str);
string start_addr_str;
string raw_content;
stack_tokens >> start_addr_str;
stack_tokens >> raw_content;
uint64_t start_addr = HexStrToL<uint64_t>(start_addr_str);
if (stack_start != 0) {
// Verify that the stack chunks in the microdump are contiguous.
assert(start_addr == stack_start + stack_content.size());
} else {
stack_start = start_addr;
}
std::vector<uint8_t> chunk = ParseHexBuf(raw_content);
stack_content.insert(stack_content.end(), chunk.begin(), chunk.end());
} else if ((pos = line.find(kCpuKey)) != string::npos) {
string cpu_state_str(line, pos + strlen(kCpuKey));
std::vector<uint8_t> cpu_state_raw = ParseHexBuf(cpu_state_str);
if (strcmp(arch.c_str(), kArmArchitecture) == 0) {
if (cpu_state_raw.size() != sizeof(MDRawContextARM)) {
std::cerr << "Malformed CPU context. Got " << cpu_state_raw.size() <<
" bytes instead of " << sizeof(MDRawContextARM) << std::endl;
continue;
}
MDRawContextARM* arm = new MDRawContextARM();
memcpy(arm, &cpu_state_raw[0], cpu_state_raw.size());
context_->SetContextARM(arm);
} else if (strcmp(arch.c_str(), kArm64Architecture) == 0) {
if (cpu_state_raw.size() != sizeof(MDRawContextARM64)) {
std::cerr << "Malformed CPU context. Got " << cpu_state_raw.size() <<
" bytes instead of " << sizeof(MDRawContextARM64) << std::endl;
continue;
}
MDRawContextARM64* arm = new MDRawContextARM64();
memcpy(arm, &cpu_state_raw[0], cpu_state_raw.size());
context_->SetContextARM64(arm);
} else {
std::cerr << "Unsupported architecture: " << arch << std::endl;
}
} else if ((pos = line.find(kMmapKey)) != string::npos) {
string mmap_line(line, pos + strlen(kMmapKey));
std::istringstream mmap_tokens(mmap_line);
string addr, offset, size, identifier, filename;
mmap_tokens >> addr;
mmap_tokens >> offset;
mmap_tokens >> size;
mmap_tokens >> identifier;
mmap_tokens >> filename;
modules_->Add(new BasicCodeModule(
HexStrToL<uint64_t>(addr), // base_address
HexStrToL<uint64_t>(size), // size
filename, // code_file
identifier, // code_identifier
filename, // debug_file
identifier, // debug_identifier
"")); // version
}
}
stack_region_->Init(stack_start, stack_content);
}
} // namespace google_breakpad