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// Copyright (c) 2011 Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Restructured in 2009 by: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
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// dump_symbols.cc: implement google_breakpad::WriteSymbolFile:
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// Find all the debugging info in a file and dump it as a Breakpad symbol file.
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#include "common/linux/dump_symbols.h"
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#include <assert.h>
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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 <link.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <iostream>
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#include <set>
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#include <string>
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#include <utility>
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#include <vector>
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#include "common/dwarf/bytereader-inl.h"
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#include "common/dwarf/dwarf2diehandler.h"
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#include "common/dwarf_cfi_to_module.h"
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#include "common/dwarf_cu_to_module.h"
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#include "common/dwarf_line_to_module.h"
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#include "common/linux/elfutils.h"
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#include "common/linux/elfutils-inl.h"
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#include "common/linux/elf_symbols_to_module.h"
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#include "common/linux/file_id.h"
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#include "common/module.h"
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#include "common/scoped_ptr.h"
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#include "common/stabs_reader.h"
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#include "common/stabs_to_module.h"
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#include "common/using_std_string.h"
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// This namespace contains helper functions.
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namespace {
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using google_breakpad::DwarfCFIToModule;
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using google_breakpad::DwarfCUToModule;
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using google_breakpad::DwarfLineToModule;
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using google_breakpad::ElfClass;
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using google_breakpad::ElfClass32;
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using google_breakpad::ElfClass64;
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using google_breakpad::FindElfSectionByName;
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using google_breakpad::GetOffset;
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using google_breakpad::IsValidElf;
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using google_breakpad::Module;
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using google_breakpad::StabsToModule;
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using google_breakpad::scoped_ptr;
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//
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// FDWrapper
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//
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// Wrapper class to make sure opened file is closed.
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//
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class FDWrapper {
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public:
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explicit FDWrapper(int fd) :
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fd_(fd) {}
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~FDWrapper() {
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if (fd_ != -1)
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close(fd_);
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}
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int get() {
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return fd_;
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}
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int release() {
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int fd = fd_;
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fd_ = -1;
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return fd;
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}
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private:
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int fd_;
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};
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//
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// MmapWrapper
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//
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// Wrapper class to make sure mapped regions are unmapped.
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//
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class MmapWrapper {
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public:
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MmapWrapper() : is_set_(false) {}
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~MmapWrapper() {
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if (is_set_ && base_ != NULL) {
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assert(size_ > 0);
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munmap(base_, size_);
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}
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}
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void set(void *mapped_address, size_t mapped_size) {
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is_set_ = true;
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base_ = mapped_address;
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size_ = mapped_size;
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}
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void release() {
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assert(is_set_);
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is_set_ = false;
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base_ = NULL;
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size_ = 0;
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}
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private:
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bool is_set_;
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void *base_;
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size_t size_;
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};
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// Find the preferred loading address of the binary.
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template<typename ElfClass>
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typename ElfClass::Addr GetLoadingAddress(
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const typename ElfClass::Phdr* program_headers,
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int nheader) {
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typedef typename ElfClass::Phdr Phdr;
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for (int i = 0; i < nheader; ++i) {
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const Phdr& header = program_headers[i];
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// For executable, it is the PT_LOAD segment with offset to zero.
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if (header.p_type == PT_LOAD &&
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header.p_offset == 0)
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return header.p_vaddr;
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}
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// For other types of ELF, return 0.
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return 0;
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}
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template<typename ElfClass>
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bool LoadStabs(const typename ElfClass::Ehdr* elf_header,
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const typename ElfClass::Shdr* stab_section,
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const typename ElfClass::Shdr* stabstr_section,
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const bool big_endian,
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Module* module) {
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// A callback object to handle data from the STABS reader.
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StabsToModule handler(module);
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// Find the addresses of the STABS data, and create a STABS reader object.
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// On Linux, STABS entries always have 32-bit values, regardless of the
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// address size of the architecture whose code they're describing, and
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// the strings are always "unitized".
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const uint8_t* stabs =
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GetOffset<ElfClass, uint8_t>(elf_header, stab_section->sh_offset);
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const uint8_t* stabstr =
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GetOffset<ElfClass, uint8_t>(elf_header, stabstr_section->sh_offset);
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google_breakpad::StabsReader reader(stabs, stab_section->sh_size,
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stabstr, stabstr_section->sh_size,
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big_endian, 4, true, &handler);
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// Read the STABS data, and do post-processing.
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if (!reader.Process())
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return false;
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handler.Finalize();
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return true;
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}
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// A line-to-module loader that accepts line number info parsed by
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// dwarf2reader::LineInfo and populates a Module and a line vector
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// with the results.
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class DumperLineToModule: public DwarfCUToModule::LineToModuleHandler {
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public:
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// Create a line-to-module converter using BYTE_READER.
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explicit DumperLineToModule(dwarf2reader::ByteReader *byte_reader)
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: byte_reader_(byte_reader) { }
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void StartCompilationUnit(const string& compilation_dir) {
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compilation_dir_ = compilation_dir;
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}
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void ReadProgram(const char *program, uint64 length,
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Module *module, std::vector<Module::Line> *lines) {
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DwarfLineToModule handler(module, compilation_dir_, lines);
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dwarf2reader::LineInfo parser(program, length, byte_reader_, &handler);
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parser.Start();
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}
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private:
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string compilation_dir_;
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dwarf2reader::ByteReader *byte_reader_;
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};
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template<typename ElfClass>
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bool LoadDwarf(const string& dwarf_filename,
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const typename ElfClass::Ehdr* elf_header,
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const bool big_endian,
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Module* module) {
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typedef typename ElfClass::Shdr Shdr;
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const dwarf2reader::Endianness endianness = big_endian ?
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dwarf2reader::ENDIANNESS_BIG : dwarf2reader::ENDIANNESS_LITTLE;
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dwarf2reader::ByteReader byte_reader(endianness);
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// Construct a context for this file.
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DwarfCUToModule::FileContext file_context(dwarf_filename, module);
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// Build a map of the ELF file's sections.
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const Shdr* sections =
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GetOffset<ElfClass, Shdr>(elf_header, elf_header->e_shoff);
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int num_sections = elf_header->e_shnum;
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const Shdr* section_names = sections + elf_header->e_shstrndx;
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for (int i = 0; i < num_sections; i++) {
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const Shdr* section = §ions[i];
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string name = GetOffset<ElfClass, char>(elf_header,
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section_names->sh_offset) +
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section->sh_name;
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const char* contents = GetOffset<ElfClass, char>(elf_header,
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section->sh_offset);
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uint64 length = section->sh_size;
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file_context.section_map[name] = std::make_pair(contents, length);
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}
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// Parse all the compilation units in the .debug_info section.
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DumperLineToModule line_to_module(&byte_reader);
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std::pair<const char *, uint64> debug_info_section
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= file_context.section_map[".debug_info"];
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// This should never have been called if the file doesn't have a
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// .debug_info section.
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assert(debug_info_section.first);
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uint64 debug_info_length = debug_info_section.second;
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for (uint64 offset = 0; offset < debug_info_length;) {
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// Make a handler for the root DIE that populates MODULE with the
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// data that was found.
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DwarfCUToModule::WarningReporter reporter(dwarf_filename, offset);
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DwarfCUToModule root_handler(&file_context, &line_to_module, &reporter);
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// Make a Dwarf2Handler that drives the DIEHandler.
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dwarf2reader::DIEDispatcher die_dispatcher(&root_handler);
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// Make a DWARF parser for the compilation unit at OFFSET.
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dwarf2reader::CompilationUnit reader(file_context.section_map,
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offset,
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&byte_reader,
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&die_dispatcher);
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// Process the entire compilation unit; get the offset of the next.
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offset += reader.Start();
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}
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return true;
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}
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// Fill REGISTER_NAMES with the register names appropriate to the
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// machine architecture given in HEADER, indexed by the register
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// numbers used in DWARF call frame information. Return true on
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// success, or false if HEADER's machine architecture is not
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// supported.
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template<typename ElfClass>
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bool DwarfCFIRegisterNames(const typename ElfClass::Ehdr* elf_header,
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std::vector<string>* register_names) {
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switch (elf_header->e_machine) {
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case EM_386:
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*register_names = DwarfCFIToModule::RegisterNames::I386();
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return true;
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case EM_ARM:
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*register_names = DwarfCFIToModule::RegisterNames::ARM();
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return true;
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case EM_X86_64:
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*register_names = DwarfCFIToModule::RegisterNames::X86_64();
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return true;
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default:
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return false;
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}
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}
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template<typename ElfClass>
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bool LoadDwarfCFI(const string& dwarf_filename,
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const typename ElfClass::Ehdr* elf_header,
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const char* section_name,
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const typename ElfClass::Shdr* section,
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const bool eh_frame,
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const typename ElfClass::Shdr* got_section,
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const typename ElfClass::Shdr* text_section,
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const bool big_endian,
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Module* module) {
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// Find the appropriate set of register names for this file's
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// architecture.
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std::vector<string> register_names;
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if (!DwarfCFIRegisterNames<ElfClass>(elf_header, ®ister_names)) {
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fprintf(stderr, "%s: unrecognized ELF machine architecture '%d';"
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" cannot convert DWARF call frame information\n",
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dwarf_filename.c_str(), elf_header->e_machine);
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return false;
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}
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const dwarf2reader::Endianness endianness = big_endian ?
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dwarf2reader::ENDIANNESS_BIG : dwarf2reader::ENDIANNESS_LITTLE;
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// Find the call frame information and its size.
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const char* cfi =
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GetOffset<ElfClass, char>(elf_header, section->sh_offset);
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size_t cfi_size = section->sh_size;
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|
|
// Plug together the parser, handler, and their entourages.
|
|
|
|
|
DwarfCFIToModule::Reporter module_reporter(dwarf_filename, section_name);
|
|
|
|
|
DwarfCFIToModule handler(module, register_names, &module_reporter);
|
|
|
|
|
dwarf2reader::ByteReader byte_reader(endianness);
|
|
|
|
|
|
|
|
|
|
byte_reader.SetAddressSize(ElfClass::kAddrSize);
|
|
|
|
|
|
|
|
|
|
// Provide the base addresses for .eh_frame encoded pointers, if
|
|
|
|
|
// possible.
|
|
|
|
|
byte_reader.SetCFIDataBase(section->sh_addr, cfi);
|
|
|
|
|
if (got_section)
|
|
|
|
|
byte_reader.SetDataBase(got_section->sh_addr);
|
|
|
|
|
if (text_section)
|
|
|
|
|
byte_reader.SetTextBase(text_section->sh_addr);
|
|
|
|
|
|
|
|
|
|
dwarf2reader::CallFrameInfo::Reporter dwarf_reporter(dwarf_filename,
|
|
|
|
|
section_name);
|
|
|
|
|
dwarf2reader::CallFrameInfo parser(cfi, cfi_size,
|
|
|
|
|
&byte_reader, &handler, &dwarf_reporter,
|
|
|
|
|
eh_frame);
|
|
|
|
|
parser.Start();
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool LoadELF(const string& obj_file, MmapWrapper* map_wrapper,
|
|
|
|
|
void** elf_header) {
|
|
|
|
|
int obj_fd = open(obj_file.c_str(), O_RDONLY);
|
|
|
|
|
if (obj_fd < 0) {
|
|
|
|
|
fprintf(stderr, "Failed to open ELF file '%s': %s\n",
|
|
|
|
|
obj_file.c_str(), strerror(errno));
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
FDWrapper obj_fd_wrapper(obj_fd);
|
|
|
|
|
struct stat st;
|
|
|
|
|
if (fstat(obj_fd, &st) != 0 && st.st_size <= 0) {
|
|
|
|
|
fprintf(stderr, "Unable to fstat ELF file '%s': %s\n",
|
|
|
|
|
obj_file.c_str(), strerror(errno));
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
void *obj_base = mmap(NULL, st.st_size,
|
|
|
|
|
PROT_READ | PROT_WRITE, MAP_PRIVATE, obj_fd, 0);
|
|
|
|
|
if (obj_base == MAP_FAILED) {
|
|
|
|
|
fprintf(stderr, "Failed to mmap ELF file '%s': %s\n",
|
|
|
|
|
obj_file.c_str(), strerror(errno));
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
map_wrapper->set(obj_base, st.st_size);
|
|
|
|
|
*elf_header = obj_base;
|
|
|
|
|
if (!IsValidElf(*elf_header)) {
|
|
|
|
|
fprintf(stderr, "Not a valid ELF file: %s\n", obj_file.c_str());
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Get the endianness of ELF_HEADER. If it's invalid, return false.
|
|
|
|
|
template<typename ElfClass>
|
|
|
|
|
bool ElfEndianness(const typename ElfClass::Ehdr* elf_header,
|
|
|
|
|
bool* big_endian) {
|
|
|
|
|
if (elf_header->e_ident[EI_DATA] == ELFDATA2LSB) {
|
|
|
|
|
*big_endian = false;
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
if (elf_header->e_ident[EI_DATA] == ELFDATA2MSB) {
|
|
|
|
|
*big_endian = true;
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
fprintf(stderr, "bad data encoding in ELF header: %d\n",
|
|
|
|
|
elf_header->e_ident[EI_DATA]);
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Read the .gnu_debuglink and get the debug file name. If anything goes
|
|
|
|
|
// wrong, return an empty string.
|
|
|
|
|
template<typename ElfClass>
|
|
|
|
|
string ReadDebugLink(const char* debuglink,
|
|
|
|
|
size_t debuglink_size,
|
|
|
|
|
const string& obj_file,
|
|
|
|
|
const std::vector<string>& debug_dirs) {
|
|
|
|
|
size_t debuglink_len = strlen(debuglink) + 5; // '\0' + CRC32.
|
|
|
|
|
debuglink_len = 4 * ((debuglink_len + 3) / 4); // Round to nearest 4 bytes.
|
|
|
|
|
|
|
|
|
|
// Sanity check.
|
|
|
|
|
if (debuglink_len != debuglink_size) {
|
|
|
|
|
fprintf(stderr, "Mismatched .gnu_debuglink string / section size: "
|
|
|
|
|
"%zx %zx\n", debuglink_len, debuglink_size);
|
|
|
|
|
return "";
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool found = false;
|
|
|
|
|
int debuglink_fd = -1;
|
|
|
|
|
string debuglink_path;
|
|
|
|
|
std::vector<string>::const_iterator it;
|
|
|
|
|
for (it = debug_dirs.begin(); it < debug_dirs.end(); ++it) {
|
|
|
|
|
const string& debug_dir = *it;
|
|
|
|
|
debuglink_path = debug_dir + "/" + debuglink;
|
|
|
|
|
debuglink_fd = open(debuglink_path.c_str(), O_RDONLY);
|
|
|
|
|
if (debuglink_fd >= 0) {
|
|
|
|
|
found = true;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!found) {
|
|
|
|
|
fprintf(stderr, "Failed to find debug ELF file for '%s' after trying:\n",
|
|
|
|
|
obj_file.c_str());
|
|
|
|
|
for (it = debug_dirs.begin(); it < debug_dirs.end(); ++it) {
|
|
|
|
|
const string debug_dir = *it;
|
|
|
|
|
fprintf(stderr, " %s/%s\n", debug_dir.c_str(), debuglink);
|
|
|
|
|
}
|
|
|
|
|
return "";
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
FDWrapper debuglink_fd_wrapper(debuglink_fd);
|
|
|
|
|
// TODO(thestig) check the CRC-32 at the end of the .gnu_debuglink
|
|
|
|
|
// section.
|
|
|
|
|
|
|
|
|
|
return debuglink_path;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
//
|
|
|
|
|
// LoadSymbolsInfo
|
|
|
|
|
//
|
|
|
|
|
// Holds the state between the two calls to LoadSymbols() in case it's necessary
|
|
|
|
|
// to follow the .gnu_debuglink section and load debug information from a
|
|
|
|
|
// different file.
|
|
|
|
|
//
|
|
|
|
|
template<typename ElfClass>
|
|
|
|
|
class LoadSymbolsInfo {
|
|
|
|
|
public:
|
|
|
|
|
typedef typename ElfClass::Addr Addr;
|
|
|
|
|
|
|
|
|
|
explicit LoadSymbolsInfo(const std::vector<string>& dbg_dirs) :
|
|
|
|
|
debug_dirs_(dbg_dirs),
|
|
|
|
|
has_loading_addr_(false) {}
|
|
|
|
|
|
|
|
|
|
// Keeps track of which sections have been loaded so sections don't
|
|
|
|
|
// accidentally get loaded twice from two different files.
|
|
|
|
|
void LoadedSection(const string §ion) {
|
|
|
|
|
if (loaded_sections_.count(section) == 0) {
|
|
|
|
|
loaded_sections_.insert(section);
|
|
|
|
|
} else {
|
|
|
|
|
fprintf(stderr, "Section %s has already been loaded.\n",
|
|
|
|
|
section.c_str());
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// The ELF file and linked debug file are expected to have the same preferred
|
|
|
|
|
// loading address.
|
|
|
|
|
void set_loading_addr(Addr addr, const string &filename) {
|
|
|
|
|
if (!has_loading_addr_) {
|
|
|
|
|
loading_addr_ = addr;
|
|
|
|
|
loaded_file_ = filename;
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (addr != loading_addr_) {
|
|
|
|
|
fprintf(stderr,
|
|
|
|
|
"ELF file '%s' and debug ELF file '%s' "
|
|
|
|
|
"have different load addresses.\n",
|
|
|
|
|
loaded_file_.c_str(), filename.c_str());
|
|
|
|
|
assert(false);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Setters and getters
|
|
|
|
|
const std::vector<string>& debug_dirs() const {
|
|
|
|
|
return debug_dirs_;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
string debuglink_file() const {
|
|
|
|
|
return debuglink_file_;
|
|
|
|
|
}
|
|
|
|
|
void set_debuglink_file(string file) {
|
|
|
|
|
debuglink_file_ = file;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private:
|
|
|
|
|
const std::vector<string>& debug_dirs_; // Directories in which to
|
|
|
|
|
// search for the debug ELF file.
|
|
|
|
|
|
|
|
|
|
string debuglink_file_; // Full path to the debug ELF file.
|
|
|
|
|
|
|
|
|
|
bool has_loading_addr_; // Indicate if LOADING_ADDR_ is valid.
|
|
|
|
|
|
|
|
|
|
Addr loading_addr_; // Saves the preferred loading address from the
|
|
|
|
|
// first call to LoadSymbols().
|
|
|
|
|
|
|
|
|
|
string loaded_file_; // Name of the file loaded from the first call to
|
|
|
|
|
// LoadSymbols().
|
|
|
|
|
|
|
|
|
|
std::set<string> loaded_sections_; // Tracks the Loaded ELF sections
|
|
|
|
|
// between calls to LoadSymbols().
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
template<typename ElfClass>
|
|
|
|
|
bool LoadSymbols(const string& obj_file,
|
|
|
|
|
const bool big_endian,
|
|
|
|
|
const typename ElfClass::Ehdr* elf_header,
|
|
|
|
|
const bool read_gnu_debug_link,
|
|
|
|
|
LoadSymbolsInfo<ElfClass>* info,
|
|
|
|
|
SymbolData symbol_data,
|
|
|
|
|
Module* module) {
|
|
|
|
|
typedef typename ElfClass::Addr Addr;
|
|
|
|
|
typedef typename ElfClass::Phdr Phdr;
|
|
|
|
|
typedef typename ElfClass::Shdr Shdr;
|
|
|
|
|
|
|
|
|
|
Addr loading_addr = GetLoadingAddress<ElfClass>(
|
|
|
|
|
GetOffset<ElfClass, Phdr>(elf_header, elf_header->e_phoff),
|
|
|
|
|
elf_header->e_phnum);
|
|
|
|
|
module->SetLoadAddress(loading_addr);
|
|
|
|
|
info->set_loading_addr(loading_addr, obj_file);
|
|
|
|
|
|
|
|
|
|
const Shdr* sections =
|
|
|
|
|
GetOffset<ElfClass, Shdr>(elf_header, elf_header->e_shoff);
|
|
|
|
|
const Shdr* section_names = sections + elf_header->e_shstrndx;
|
|
|
|
|
const char* names =
|
|
|
|
|
GetOffset<ElfClass, char>(elf_header, section_names->sh_offset);
|
|
|
|
|
const char *names_end = names + section_names->sh_size;
|
|
|
|
|
bool found_debug_info_section = false;
|
|
|
|
|
bool found_usable_info = false;
|
|
|
|
|
|
|
|
|
|
if (symbol_data != ONLY_CFI) {
|
|
|
|
|
// Look for STABS debugging information, and load it if present.
|
|
|
|
|
const Shdr* stab_section =
|
|
|
|
|
FindElfSectionByName<ElfClass>(".stab", SHT_PROGBITS,
|
|
|
|
|
sections, names, names_end,
|
|
|
|
|
elf_header->e_shnum);
|
|
|
|
|
if (stab_section) {
|
|
|
|
|
const Shdr* stabstr_section = stab_section->sh_link + sections;
|
|
|
|
|
if (stabstr_section) {
|
|
|
|
|
found_debug_info_section = true;
|
|
|
|
|
found_usable_info = true;
|
|
|
|
|
info->LoadedSection(".stab");
|
|
|
|
|
if (!LoadStabs<ElfClass>(elf_header, stab_section, stabstr_section,
|
|
|
|
|
big_endian, module)) {
|
|
|
|
|
fprintf(stderr, "%s: \".stab\" section found, but failed to load"
|
|
|
|
|
" STABS debugging information\n", obj_file.c_str());
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Look for DWARF debugging information, and load it if present.
|
|
|
|
|
const Shdr* dwarf_section =
|
|
|
|
|
FindElfSectionByName<ElfClass>(".debug_info", SHT_PROGBITS,
|
|
|
|
|
sections, names, names_end,
|
|
|
|
|
elf_header->e_shnum);
|
|
|
|
|
if (dwarf_section) {
|
|
|
|
|
found_debug_info_section = true;
|
|
|
|
|
found_usable_info = true;
|
|
|
|
|
info->LoadedSection(".debug_info");
|
|
|
|
|
if (!LoadDwarf<ElfClass>(obj_file, elf_header, big_endian, module))
|
|
|
|
|
fprintf(stderr, "%s: \".debug_info\" section found, but failed to load "
|
|
|
|
|
"DWARF debugging information\n", obj_file.c_str());
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (symbol_data != NO_CFI) {
|
|
|
|
|
// Dwarf Call Frame Information (CFI) is actually independent from
|
|
|
|
|
// the other DWARF debugging information, and can be used alone.
|
|
|
|
|
const Shdr* dwarf_cfi_section =
|
|
|
|
|
FindElfSectionByName<ElfClass>(".debug_frame", SHT_PROGBITS,
|
|
|
|
|
sections, names, names_end,
|
|
|
|
|
elf_header->e_shnum);
|
|
|
|
|
if (dwarf_cfi_section) {
|
|
|
|
|
// Ignore the return value of this function; even without call frame
|
|
|
|
|
// information, the other debugging information could be perfectly
|
|
|
|
|
// useful.
|
|
|
|
|
info->LoadedSection(".debug_frame");
|
|
|
|
|
bool result =
|
|
|
|
|
LoadDwarfCFI<ElfClass>(obj_file, elf_header, ".debug_frame",
|
|
|
|
|
dwarf_cfi_section, false, 0, 0, big_endian,
|
|
|
|
|
module);
|
|
|
|
|
found_usable_info = found_usable_info || result;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Linux C++ exception handling information can also provide
|
|
|
|
|
// unwinding data.
|
|
|
|
|
const Shdr* eh_frame_section =
|
|
|
|
|
FindElfSectionByName<ElfClass>(".eh_frame", SHT_PROGBITS,
|
|
|
|
|
sections, names, names_end,
|
|
|
|
|
elf_header->e_shnum);
|
|
|
|
|
if (eh_frame_section) {
|
|
|
|
|
// Pointers in .eh_frame data may be relative to the base addresses of
|
|
|
|
|
// certain sections. Provide those sections if present.
|
|
|
|
|
const Shdr* got_section =
|
|
|
|
|
FindElfSectionByName<ElfClass>(".got", SHT_PROGBITS,
|
|
|
|
|
sections, names, names_end,
|
|
|
|
|
elf_header->e_shnum);
|
|
|
|
|
const Shdr* text_section =
|
|
|
|
|
FindElfSectionByName<ElfClass>(".text", SHT_PROGBITS,
|
|
|
|
|
sections, names, names_end,
|
|
|
|
|
elf_header->e_shnum);
|
|
|
|
|
info->LoadedSection(".eh_frame");
|
|
|
|
|
// As above, ignore the return value of this function.
|
|
|
|
|
bool result =
|
|
|
|
|
LoadDwarfCFI<ElfClass>(obj_file, elf_header, ".eh_frame",
|
|
|
|
|
eh_frame_section, true,
|
|
|
|
|
got_section, text_section, big_endian, module);
|
|
|
|
|
found_usable_info = found_usable_info || result;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!found_debug_info_section) {
|
|
|
|
|
fprintf(stderr, "%s: file contains no debugging information"
|
|
|
|
|
" (no \".stab\" or \".debug_info\" sections)\n",
|
|
|
|
|
obj_file.c_str());
|
|
|
|
|
|
|
|
|
|
// Failed, but maybe there's a .gnu_debuglink section?
|
|
|
|
|
if (read_gnu_debug_link) {
|
|
|
|
|
const Shdr* gnu_debuglink_section
|
|
|
|
|
= FindElfSectionByName<ElfClass>(".gnu_debuglink", SHT_PROGBITS,
|
|
|
|
|
sections, names,
|
|
|
|
|
names_end, elf_header->e_shnum);
|
|
|
|
|
if (gnu_debuglink_section) {
|
|
|
|
|
if (!info->debug_dirs().empty()) {
|
|
|
|
|
const char* debuglink_contents =
|
|
|
|
|
GetOffset<ElfClass, char>(elf_header,
|
|
|
|
|
gnu_debuglink_section->sh_offset);
|
|
|
|
|
string debuglink_file
|
|
|
|
|
= ReadDebugLink<ElfClass>(debuglink_contents,
|
|
|
|
|
gnu_debuglink_section->sh_size,
|
|
|
|
|
obj_file, info->debug_dirs());
|
|
|
|
|
info->set_debuglink_file(debuglink_file);
|
|
|
|
|
} else {
|
|
|
|
|
fprintf(stderr, ".gnu_debuglink section found in '%s', "
|
|
|
|
|
"but no debug path specified.\n", obj_file.c_str());
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
fprintf(stderr, "%s does not contain a .gnu_debuglink section.\n",
|
|
|
|
|
obj_file.c_str());
|
|
|
|
|
}
|
|
|
|
|
} else if (symbol_data != ONLY_CFI) {
|
|
|
|
|
// The caller doesn't want to consult .gnu_debuglink.
|
|
|
|
|
// See if there are export symbols available.
|
|
|
|
|
const Shdr* dynsym_section =
|
|
|
|
|
FindElfSectionByName<ElfClass>(".dynsym", SHT_DYNSYM,
|
|
|
|
|
sections, names, names_end,
|
|
|
|
|
elf_header->e_shnum);
|
|
|
|
|
const Shdr* dynstr_section =
|
|
|
|
|
FindElfSectionByName<ElfClass>(".dynstr", SHT_STRTAB,
|
|
|
|
|
sections, names, names_end,
|
|
|
|
|
elf_header->e_shnum);
|
|
|
|
|
if (dynsym_section && dynstr_section) {
|
|
|
|
|
info->LoadedSection(".dynsym");
|
|
|
|
|
|
|
|
|
|
const uint8_t* dynsyms =
|
|
|
|
|
GetOffset<ElfClass, uint8_t>(elf_header, dynsym_section->sh_offset);
|
|
|
|
|
const uint8_t* dynstrs =
|
|
|
|
|
GetOffset<ElfClass, uint8_t>(elf_header, dynstr_section->sh_offset);
|
|
|
|
|
bool result =
|
|
|
|
|
ELFSymbolsToModule(dynsyms,
|
|
|
|
|
dynsym_section->sh_size,
|
|
|
|
|
dynstrs,
|
|
|
|
|
dynstr_section->sh_size,
|
|
|
|
|
big_endian,
|
|
|
|
|
ElfClass::kAddrSize,
|
|
|
|
|
module);
|
|
|
|
|
found_usable_info = found_usable_info || result;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Return true if some usable information was found, since
|
|
|
|
|
// the caller doesn't want to use .gnu_debuglink.
|
|
|
|
|
return found_usable_info;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// No debug info was found, let the user try again with .gnu_debuglink
|
|
|
|
|
// if present.
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Return the breakpad symbol file identifier for the architecture of
|
|
|
|
|
// ELF_HEADER.
|
|
|
|
|
template<typename ElfClass>
|
|
|
|
|
const char* ElfArchitecture(const typename ElfClass::Ehdr* elf_header) {
|
|
|
|
|
typedef typename ElfClass::Half Half;
|
|
|
|
|
Half arch = elf_header->e_machine;
|
|
|
|
|
switch (arch) {
|
|
|
|
|
case EM_386: return "x86";
|
|
|
|
|
case EM_ARM: return "arm";
|
|
|
|
|
case EM_MIPS: return "mips";
|
|
|
|
|
case EM_PPC64: return "ppc64";
|
|
|
|
|
case EM_PPC: return "ppc";
|
|
|
|
|
case EM_S390: return "s390";
|
|
|
|
|
case EM_SPARC: return "sparc";
|
|
|
|
|
case EM_SPARCV9: return "sparcv9";
|
|
|
|
|
case EM_X86_64: return "x86_64";
|
|
|
|
|
default: return NULL;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Format the Elf file identifier in IDENTIFIER as a UUID with the
|
|
|
|
|
// dashes removed.
|
|
|
|
|
string FormatIdentifier(unsigned char identifier[16]) {
|
|
|
|
|
char identifier_str[40];
|
|
|
|
|
google_breakpad::FileID::ConvertIdentifierToString(
|
|
|
|
|
identifier,
|
|
|
|
|
identifier_str,
|
|
|
|
|
sizeof(identifier_str));
|
|
|
|
|
string id_no_dash;
|
|
|
|
|
for (int i = 0; identifier_str[i] != '\0'; ++i)
|
|
|
|
|
if (identifier_str[i] != '-')
|
|
|
|
|
id_no_dash += identifier_str[i];
|
|
|
|
|
// Add an extra "0" by the end. PDB files on Windows have an 'age'
|
|
|
|
|
// number appended to the end of the file identifier; this isn't
|
|
|
|
|
// really used or necessary on other platforms, but be consistent.
|
|
|
|
|
id_no_dash += '0';
|
|
|
|
|
return id_no_dash;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Return the non-directory portion of FILENAME: the portion after the
|
|
|
|
|
// last slash, or the whole filename if there are no slashes.
|
|
|
|
|
string BaseFileName(const string &filename) {
|
|
|
|
|
// Lots of copies! basename's behavior is less than ideal.
|
|
|
|
|
char *c_filename = strdup(filename.c_str());
|
|
|
|
|
string base = basename(c_filename);
|
|
|
|
|
free(c_filename);
|
|
|
|
|
return base;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template<typename ElfClass>
|
|
|
|
|
bool ReadSymbolDataElfClass(const typename ElfClass::Ehdr* elf_header,
|
|
|
|
|
const string& obj_filename,
|
|
|
|
|
const std::vector<string>& debug_dirs,
|
|
|
|
|
SymbolData symbol_data,
|
|
|
|
|
Module** out_module) {
|
|
|
|
|
typedef typename ElfClass::Ehdr Ehdr;
|
|
|
|
|
typedef typename ElfClass::Shdr Shdr;
|
|
|
|
|
|
|
|
|
|
*out_module = NULL;
|
|
|
|
|
|
|
|
|
|
unsigned char identifier[16];
|
|
|
|
|
if (!google_breakpad::FileID::ElfFileIdentifierFromMappedFile(elf_header,
|
|
|
|
|
identifier)) {
|
|
|
|
|
fprintf(stderr, "%s: unable to generate file identifier\n",
|
|
|
|
|
obj_filename.c_str());
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
const char *architecture = ElfArchitecture<ElfClass>(elf_header);
|
|
|
|
|
if (!architecture) {
|
|
|
|
|
fprintf(stderr, "%s: unrecognized ELF machine architecture: %d\n",
|
|
|
|
|
obj_filename.c_str(), elf_header->e_machine);
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Figure out what endianness this file is.
|
|
|
|
|
bool big_endian;
|
|
|
|
|
if (!ElfEndianness<ElfClass>(elf_header, &big_endian))
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
string name = BaseFileName(obj_filename);
|
|
|
|
|
string os = "Linux";
|
|
|
|
|
string id = FormatIdentifier(identifier);
|
|
|
|
|
|
|
|
|
|
LoadSymbolsInfo<ElfClass> info(debug_dirs);
|
|
|
|
|
scoped_ptr<Module> module(new Module(name, os, architecture, id));
|
|
|
|
|
if (!LoadSymbols<ElfClass>(obj_filename, big_endian, elf_header,
|
|
|
|
|
!debug_dirs.empty(), &info,
|
|
|
|
|
symbol_data, module.get())) {
|
|
|
|
|
const string debuglink_file = info.debuglink_file();
|
|
|
|
|
if (debuglink_file.empty())
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
// Load debuglink ELF file.
|
|
|
|
|
fprintf(stderr, "Found debugging info in %s\n", debuglink_file.c_str());
|
|
|
|
|
MmapWrapper debug_map_wrapper;
|
|
|
|
|
Ehdr* debug_elf_header = NULL;
|
|
|
|
|
if (!LoadELF(debuglink_file, &debug_map_wrapper,
|
|
|
|
|
reinterpret_cast<void**>(&debug_elf_header)))
|
|
|
|
|
return false;
|
|
|
|
|
// Sanity checks to make sure everything matches up.
|
|
|
|
|
const char *debug_architecture =
|
|
|
|
|
ElfArchitecture<ElfClass>(debug_elf_header);
|
|
|
|
|
if (!debug_architecture) {
|
|
|
|
|
fprintf(stderr, "%s: unrecognized ELF machine architecture: %d\n",
|
|
|
|
|
debuglink_file.c_str(), debug_elf_header->e_machine);
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
if (strcmp(architecture, debug_architecture)) {
|
|
|
|
|
fprintf(stderr, "%s with ELF machine architecture %s does not match "
|
|
|
|
|
"%s with ELF architecture %s\n",
|
|
|
|
|
debuglink_file.c_str(), debug_architecture,
|
|
|
|
|
obj_filename.c_str(), architecture);
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool debug_big_endian;
|
|
|
|
|
if (!ElfEndianness<ElfClass>(debug_elf_header, &debug_big_endian))
|
|
|
|
|
return false;
|
|
|
|
|
if (debug_big_endian != big_endian) {
|
|
|
|
|
fprintf(stderr, "%s and %s does not match in endianness\n",
|
|
|
|
|
obj_filename.c_str(), debuglink_file.c_str());
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!LoadSymbols<ElfClass>(debuglink_file, debug_big_endian,
|
|
|
|
|
debug_elf_header, false, &info,
|
|
|
|
|
symbol_data, module.get())) {
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
*out_module = module.release();
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
} // namespace
|
|
|
|
|
|
|
|
|
|
namespace google_breakpad {
|
|
|
|
|
|
|
|
|
|
// Not explicitly exported, but not static so it can be used in unit tests.
|
|
|
|
|
bool ReadSymbolDataInternal(const uint8_t* obj_file,
|
|
|
|
|
const string& obj_filename,
|
|
|
|
|
const std::vector<string>& debug_dirs,
|
|
|
|
|
SymbolData symbol_data,
|
|
|
|
|
Module** module) {
|
|
|
|
|
|
|
|
|
|
if (!IsValidElf(obj_file)) {
|
|
|
|
|
fprintf(stderr, "Not a valid ELF file: %s\n", obj_filename.c_str());
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int elfclass = ElfClass(obj_file);
|
|
|
|
|
if (elfclass == ELFCLASS32) {
|
|
|
|
|
return ReadSymbolDataElfClass<ElfClass32>(
|
|
|
|
|
reinterpret_cast<const Elf32_Ehdr*>(obj_file), obj_filename, debug_dirs,
|
|
|
|
|
symbol_data, module);
|
|
|
|
|
}
|
|
|
|
|
if (elfclass == ELFCLASS64) {
|
|
|
|
|
return ReadSymbolDataElfClass<ElfClass64>(
|
|
|
|
|
reinterpret_cast<const Elf64_Ehdr*>(obj_file), obj_filename, debug_dirs,
|
|
|
|
|
symbol_data, module);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool WriteSymbolFile(const string &obj_file,
|
|
|
|
|
const std::vector<string>& debug_dirs,
|
|
|
|
|
SymbolData symbol_data,
|
|
|
|
|
std::ostream &sym_stream) {
|
|
|
|
|
Module* module;
|
|
|
|
|
if (!ReadSymbolData(obj_file, debug_dirs, symbol_data, &module))
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
bool result = module->Write(sym_stream, symbol_data);
|
|
|
|
|
delete module;
|
|
|
|
|
return result;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool ReadSymbolData(const string& obj_file,
|
|
|
|
|
const std::vector<string>& debug_dirs,
|
|
|
|
|
SymbolData symbol_data,
|
|
|
|
|
Module** module) {
|
|
|
|
|
MmapWrapper map_wrapper;
|
|
|
|
|
void* elf_header = NULL;
|
|
|
|
|
if (!LoadELF(obj_file, &map_wrapper, &elf_header))
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
return ReadSymbolDataInternal(reinterpret_cast<uint8_t*>(elf_header),
|
|
|
|
|
obj_file, debug_dirs, symbol_data, module);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
} // namespace google_breakpad
|
Ted Mielczarek