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Diffstat (limited to 'src/processor/microdump.cc')
-rw-r--r-- | src/processor/microdump.cc | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/src/processor/microdump.cc b/src/processor/microdump.cc new file mode 100644 index 00000000..3e45d175 --- /dev/null +++ b/src/processor/microdump.cc @@ -0,0 +1,262 @@ +// 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[] = "armv7l"; + +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; +} + + +// +// 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()) { + 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 unused_id; + os_tokens >> unused_id; + os_tokens >> arch; + arch = arch.substr(1, arch.length() - 2); // remove quotes + // 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) { + MDRawContextARM* arm = new MDRawContextARM(); + memcpy(arm, &cpu_state_raw[0], cpu_state_raw.size()); + context_->SetContextARM(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 + |