// Copyright 2018 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef BASE_DEBUG_ELF_READER_H_ #define BASE_DEBUG_ELF_READER_H_ #include #include "base/base_export.h" #include "base/containers/span.h" #include "base/hash/sha1.h" #include "base/strings/string_piece.h" #include "third_party/abseil-cpp/absl/types/optional.h" // Functions for querying metadata from ELF binaries. All functions are signal // safe and require that the file be fully memory mapped. #if __SIZEOF_POINTER__ == 4 using Phdr = Elf32_Phdr; #else using Phdr = Elf64_Phdr; #endif namespace base { namespace debug { // Hex-encodes the build ID from the ELF binary located at |elf_mapped_base|. // Returns the length of the build ID in bytes, or zero if the build ID couldn't // be read. // When |uppercase| is |true|, the output string is written using uppercase hex // characters. Otherwise, the output is lowercased. constexpr size_t kMaxBuildIdStringLength = kSHA1Length * 2; using ElfBuildIdBuffer = char[kMaxBuildIdStringLength + 1]; size_t BASE_EXPORT ReadElfBuildId(const void* elf_mapped_base, bool uppercase, ElfBuildIdBuffer build_id); // Returns the library name from the ELF file mapped at |elf_mapped_base|. // Returns an empty result if the name could not be read. absl::optional BASE_EXPORT ReadElfLibraryName(const void* elf_mapped_base); // Returns a span of ELF program headers for the ELF file mapped at // |elf_mapped_base|, or an empty span if the header couldn't be read. span BASE_EXPORT GetElfProgramHeaders(const void* elf_mapped_base); // Returns the offset to add to virtual addresses in the image to compute the // mapped virtual address. This value must be added to the p_vaddr field in the // Phdrs to obtain the mapped virtual address. size_t BASE_EXPORT GetRelocationOffset(const void* elf_mapped_base); } // namespace debug } // namespace base #endif // BASE_DEBUG_ELF_READER_H_