// Copyright 2016 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "dso.h"
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#include <elf.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include <unistd.h>
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#include <algorithm>
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#include <vector>
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#include <build_id.h>
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#include <read_elf.h>
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#include "base/logging.h"
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#include "compat/string.h"
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#include "file_reader.h"
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namespace quipper {
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void InitializeLibelf() {
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// Unnecessary.
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}
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bool ReadElfBuildId(const string &filename, string *buildid) {
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BuildId id;
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ElfStatus status = GetBuildIdFromElfFile(filename, &id);
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if (status == ElfStatus::NO_ERROR) {
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*buildid = id.ToString();
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return true;
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}
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return false;
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}
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bool ReadElfBuildId(int fd, string *buildid) {
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// TODO: Implement. b/74410255.
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return false;
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}
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// read /sys/module/<module_name>/notes/.note.gnu.build-id
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bool ReadModuleBuildId(const string &module_name, string *buildid) {
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string note_filename =
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"/sys/module/" + module_name + "/notes/.note.gnu.build-id";
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FileReader file(note_filename);
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if (!file.IsOpen()) return false;
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return ReadBuildIdNote(&file, buildid);
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}
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bool ReadBuildIdNote(DataReader *data, string *buildid) {
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// Non-simpleperf implementation, as a reader is given.
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Elf64_Nhdr note_header;
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while (data->ReadData(sizeof(note_header), ¬e_header)) {
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size_t name_size = Align<4>(note_header.n_namesz);
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size_t desc_size = Align<4>(note_header.n_descsz);
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string name;
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if (!data->ReadString(name_size, &name)) return false;
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string desc;
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if (!data->ReadDataString(desc_size, &desc)) return false;
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if (note_header.n_type == NT_GNU_BUILD_ID && name == ELF_NOTE_GNU) {
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*buildid = desc;
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return true;
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}
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}
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return false;
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}
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bool IsKernelNonModuleName(string name) {
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// List from kernel: tools/perf/util/dso.c : __kmod_path__parse()
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static const std::vector<string> kKernelNonModuleNames{
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"[kernel.kallsyms]",
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"[guest.kernel.kallsyms",
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"[vdso]",
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"[vsyscall]",
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};
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for (const auto &n : kKernelNonModuleNames) {
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if (name.compare(0, n.size(), n) == 0) return true;
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}
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return false;
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}
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// Do the |DSOInfo| and |struct stat| refer to the same inode?
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bool SameInode(const DSOInfo &dso, const struct stat *s) {
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return dso.maj == major(s->st_dev) && dso.min == minor(s->st_dev) &&
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dso.ino == s->st_ino;
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}
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} // namespace quipper
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