1 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
2 // -*- mode: C++ -*-
4 // Copyright 2020-2022 Google LLC
148   Check(gelf_getehdr(elf, &header) != nullptr) << "could not get ELF header";  in GetMachine()
174     Check(gelf_getshdr(section, &header) != nullptr)  in GetSectionsIf()
185   Check(elf_getshdrstrndx(elf, &shdr_strtab_index) == 0)  in GetSectionsByName()
199   Check(sections.size() == 1)  in MaybeGetSectionByName()
206   Check(section != nullptr) << "no section found with name '" << name << "'";  in GetSectionByName()
216   Check(sections.size() == 1) << "multiple sections found with type " << type;  in MaybeGetSectionByType()
222   Check(section != nullptr) << "no section found with index " << index;  in GetSectionByIndex()
234   Check(gelf_getshdr(section, &section_header) != nullptr)  in GetSectionInfo()
237   Check(data != nullptr) << "section (index = " << index << ") data is invalid";  in GetSectionInfo()
242   Check(section_header.sh_entsize != 0)  in GetNumberOfEntries()
250   Check(data != nullptr) << "elf_rawdata failed on section " << name;  in GetRawData()
251   return {static_cast<char*>(data->d_buf), data->d_size};  in GetRawData()
257   Check(name != nullptr) << "string was not found (section: " << section  in GetString()
264   Check(gelf_getehdr(elf, &elf_header) != nullptr)  in GetSymbolTableSection()
271     // exported symbols in .symtab, all other ELF types have their  in GetSymbolTableSection()
272     // exported symbols in .dynsym.  in GetSymbolTableSection()
300   Check(IsCFISymbolName(cfi_name))  in UnwrapCFISymbolName()
302   return cfi_name.substr(0, cfi_name.size() - kCFISuffix.size());  in UnwrapCFISymbolName()
318   Check(number_of_symbols <= std::numeric_limits<int>::max())  in GetSymbols()
319       << "number of symbols exceeds INT_MAX";  in GetSymbols()
322     Check(gelf_getsym(symbol_table_data, static_cast<int>(i), &symbol) !=  in GetSymbols()
353   // symbols via the EXPORT_SYMBOL_* macros and it contains symbol names and  in IsLinuxKernelBinary()
357   // not export symbols themselves via the ksymtab. Yet they can be identified  in IsLinuxKernelBinary()
359   // name, also check for the presence of `.gnu.linkonce.this_module` to get  in IsLinuxKernelBinary()
368   Check(gelf_getehdr(elf, &elf_header) != nullptr)  in IsRelocatable()
376   Check(gelf_getehdr(elf, &elf_header) != nullptr)  in IsLittleEndianBinary()
446   Check(symbol_table_section != nullptr)  in GetElfSymbols()
453   // CFI symbols may be only in .symtab  in GetCFISymbols()
458     // symbols in the first place, so the best we can do is returning an empty  in GetCFISymbols()
467   Check(is_little_endian_binary_)  in GetElfSymbolCRC()
468       << "CRC is not supported in big-endian binaries";  in GetElfSymbolCRC()
473   Check(symbol.value_type == SymbolTableEntry::ValueType::RELATIVE_TO_SECTION)  in GetElfSymbolCRC()
478   Check(data->d_buf != nullptr) << "Section has no data buffer";  in GetElfSymbolCRC()
480   Check(address >= header.sh_addr)  in GetElfSymbolCRC()
483   const size_t offset = address - header.sh_addr;  in GetElfSymbolCRC()
485   Check(offset_end <= data->d_size && offset_end <= header.sh_size)  in GetElfSymbolCRC()
489       reinterpret_cast<char*>(data->d_buf) + offset)};  in GetElfSymbolCRC()
494   Check(symbol.value_type == SymbolTableEntry::ValueType::RELATIVE_TO_SECTION)  in GetElfSymbolNamespace()
499   Check(data->d_buf != nullptr) << "Section has no data buffer";  in GetElfSymbolNamespace()
502   Check(address >= header.sh_addr)  in GetElfSymbolNamespace()
505   const size_t offset = address - header.sh_addr;  in GetElfSymbolNamespace()
506   Check(offset < data->d_size && offset < header.sh_size)  in GetElfSymbolNamespace()
509   const char* begin = reinterpret_cast<const char*>(data->d_buf) + offset;  in GetElfSymbolNamespace()
511   const size_t length = strnlen(begin, data->d_size - offset);  in GetElfSymbolNamespace()
512   Check(offset + length < data->d_size)  in GetElfSymbolNamespace()
513       << "Namespace string should be null-terminated";  in GetElfSymbolNamespace()
522   Check(symbol.value_type == SymbolTableEntry::ValueType::RELATIVE_TO_SECTION)  in GetAbsoluteAddress()
523       << "Only absolute and relative to sections symbols are supported";  in GetAbsoluteAddress()
528     Check(gelf_getshdr(section, &header) != nullptr)  in GetAbsoluteAddress()
530     Check(symbol.value + symbol.size <= header.sh_size)  in GetAbsoluteAddress()