| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ART_COMPILER_ELF_BUILDER_H_ |
| #define ART_COMPILER_ELF_BUILDER_H_ |
| |
| #include "buffered_output_stream.h" |
| #include "elf_utils.h" |
| #include "file_output_stream.h" |
| #include "instruction_set.h" |
| |
| namespace art { |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Shdr> |
| class ElfSectionBuilder { |
| public: |
| ElfSectionBuilder(const std::string& sec_name, Elf_Word type, Elf_Word flags, |
| const ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> *link, Elf_Word info, |
| Elf_Word align, Elf_Word entsize) : name_(sec_name), link_(link) { |
| memset(§ion_, 0, sizeof(section_)); |
| section_.sh_type = type; |
| section_.sh_flags = flags; |
| section_.sh_info = info; |
| section_.sh_addralign = align; |
| section_.sh_entsize = entsize; |
| } |
| |
| virtual ~ElfSectionBuilder() {} |
| |
| Elf_Shdr section_; |
| Elf_Word section_index_ = 0; |
| |
| Elf_Word GetLink() { |
| return (link_) ? link_->section_index_ : 0; |
| } |
| |
| const std::string name_; |
| |
| protected: |
| const ElfSectionBuilder* link_; |
| }; |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Dyn, typename Elf_Shdr> |
| class ElfDynamicBuilder : public ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> { |
| public: |
| void AddDynamicTag(Elf_Sword tag, Elf_Word d_un) { |
| if (tag == DT_NULL) { |
| return; |
| } |
| dynamics_.push_back({nullptr, tag, d_un}); |
| } |
| |
| void AddDynamicTag(Elf_Sword tag, Elf_Word d_un, |
| ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>* section) { |
| if (tag == DT_NULL) { |
| return; |
| } |
| dynamics_.push_back({section, tag, d_un}); |
| } |
| |
| ElfDynamicBuilder(const std::string& sec_name, |
| ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> *link) |
| : ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>(sec_name, SHT_DYNAMIC, SHF_ALLOC | SHF_ALLOC, |
| link, 0, kPageSize, sizeof(Elf_Dyn)) {} |
| ~ElfDynamicBuilder() {} |
| |
| Elf_Word GetSize() { |
| // Add 1 for the DT_NULL, 1 for DT_STRSZ, and 1 for DT_SONAME. All of |
| // these must be added when we actually put the file together because |
| // their values are very dependent on state. |
| return dynamics_.size() + 3; |
| } |
| |
| // Create the actual dynamic vector. strsz should be the size of the .dynstr |
| // table and soname_off should be the offset of the soname in .dynstr. |
| // Since niether can be found prior to final layout we will wait until here |
| // to add them. |
| std::vector<Elf_Dyn> GetDynamics(Elf_Word strsz, Elf_Word soname) { |
| std::vector<Elf_Dyn> ret; |
| for (auto it = dynamics_.cbegin(); it != dynamics_.cend(); ++it) { |
| if (it->section_) { |
| // We are adding an address relative to a section. |
| ret.push_back( |
| {it->tag_, {it->off_ + it->section_->section_.sh_addr}}); |
| } else { |
| ret.push_back({it->tag_, {it->off_}}); |
| } |
| } |
| ret.push_back({DT_STRSZ, {strsz}}); |
| ret.push_back({DT_SONAME, {soname}}); |
| ret.push_back({DT_NULL, {0}}); |
| return ret; |
| } |
| |
| protected: |
| struct ElfDynamicState { |
| ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>* section_; |
| Elf_Sword tag_; |
| Elf_Word off_; |
| }; |
| std::vector<ElfDynamicState> dynamics_; |
| }; |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Shdr> |
| class ElfRawSectionBuilder : public ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> { |
| public: |
| ElfRawSectionBuilder(const std::string& sec_name, Elf_Word type, Elf_Word flags, |
| const ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>* link, Elf_Word info, |
| Elf_Word align, Elf_Word entsize) |
| : ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>(sec_name, type, flags, link, info, align, |
| entsize) {} |
| ~ElfRawSectionBuilder() {} |
| std::vector<uint8_t>* GetBuffer() { return &buf_; } |
| void SetBuffer(std::vector<uint8_t>&& buf) { buf_ = buf; } |
| |
| protected: |
| std::vector<uint8_t> buf_; |
| }; |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Shdr> |
| class ElfOatSectionBuilder : public ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> { |
| public: |
| ElfOatSectionBuilder(const std::string& sec_name, Elf_Word size, Elf_Word offset, |
| Elf_Word type, Elf_Word flags) |
| : ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>(sec_name, type, flags, nullptr, 0, kPageSize, |
| 0), offset_(offset), size_(size) {} |
| ~ElfOatSectionBuilder() {} |
| |
| Elf_Word GetOffset() { |
| return offset_; |
| } |
| |
| Elf_Word GetSize() { |
| return size_; |
| } |
| |
| protected: |
| // Offset of the content within the file. |
| Elf_Word offset_; |
| // Size of the content within the file. |
| Elf_Word size_; |
| }; |
| |
| static inline constexpr uint8_t MakeStInfo(uint8_t binding, uint8_t type) { |
| return ((binding) << 4) + ((type) & 0xf); |
| } |
| |
| // from bionic |
| static inline unsigned elfhash(const char *_name) { |
| const unsigned char *name = (const unsigned char *) _name; |
| unsigned h = 0, g; |
| |
| while (*name) { |
| h = (h << 4) + *name++; |
| g = h & 0xf0000000; |
| h ^= g; |
| h ^= g >> 24; |
| } |
| return h; |
| } |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Addr, typename Elf_Sym, |
| typename Elf_Shdr> |
| class ElfSymtabBuilder : public ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> { |
| public: |
| // Add a symbol with given name to this symtab. The symbol refers to |
| // 'relative_addr' within the given section and has the given attributes. |
| void AddSymbol(const std::string& name, |
| const ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>* section, |
| Elf_Addr addr, |
| bool is_relative, |
| Elf_Word size, |
| uint8_t binding, |
| uint8_t type, |
| uint8_t other = 0) { |
| CHECK(section); |
| ElfSymtabBuilder::ElfSymbolState state {name, section, addr, size, is_relative, |
| MakeStInfo(binding, type), other, 0}; |
| symbols_.push_back(state); |
| } |
| |
| ElfSymtabBuilder(const std::string& sec_name, Elf_Word type, |
| const std::string& str_name, Elf_Word str_type, bool alloc) |
| : ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>(sec_name, type, ((alloc) ? SHF_ALLOC : 0U), |
| &strtab_, 0, sizeof(Elf_Word), |
| sizeof(Elf_Sym)), str_name_(str_name), |
| str_type_(str_type), |
| strtab_(str_name, |
| str_type, |
| ((alloc) ? SHF_ALLOC : 0U), |
| nullptr, 0, 1, 1) {} |
| ~ElfSymtabBuilder() {} |
| |
| std::vector<Elf_Word> GenerateHashContents() { |
| // Here is how The ELF hash table works. |
| // There are 3 arrays to worry about. |
| // * The symbol table where the symbol information is. |
| // * The bucket array which is an array of indexes into the symtab and chain. |
| // * The chain array which is also an array of indexes into the symtab and chain. |
| // |
| // Lets say the state is something like this. |
| // +--------+ +--------+ +-----------+ |
| // | symtab | | bucket | | chain | |
| // | null | | 1 | | STN_UNDEF | |
| // | <sym1> | | 4 | | 2 | |
| // | <sym2> | | | | 5 | |
| // | <sym3> | | | | STN_UNDEF | |
| // | <sym4> | | | | 3 | |
| // | <sym5> | | | | STN_UNDEF | |
| // +--------+ +--------+ +-----------+ |
| // |
| // The lookup process (in python psudocode) is |
| // |
| // def GetSym(name): |
| // # NB STN_UNDEF == 0 |
| // indx = bucket[elfhash(name) % num_buckets] |
| // while indx != STN_UNDEF: |
| // if GetSymbolName(symtab[indx]) == name: |
| // return symtab[indx] |
| // indx = chain[indx] |
| // return SYMBOL_NOT_FOUND |
| // |
| // Between bucket and chain arrays every symtab index must be present exactly |
| // once (except for STN_UNDEF, which must be present 1 + num_bucket times). |
| |
| // Select number of buckets. |
| // This is essentially arbitrary. |
| Elf_Word nbuckets; |
| Elf_Word chain_size = GetSize(); |
| if (symbols_.size() < 8) { |
| nbuckets = 2; |
| } else if (symbols_.size() < 32) { |
| nbuckets = 4; |
| } else if (symbols_.size() < 256) { |
| nbuckets = 16; |
| } else { |
| // Have about 32 ids per bucket. |
| nbuckets = RoundUp(symbols_.size()/32, 2); |
| } |
| std::vector<Elf_Word> hash; |
| hash.push_back(nbuckets); |
| hash.push_back(chain_size); |
| uint32_t bucket_offset = hash.size(); |
| uint32_t chain_offset = bucket_offset + nbuckets; |
| hash.resize(hash.size() + nbuckets + chain_size, 0); |
| |
| Elf_Word* buckets = hash.data() + bucket_offset; |
| Elf_Word* chain = hash.data() + chain_offset; |
| |
| // Set up the actual hash table. |
| for (Elf_Word i = 0; i < symbols_.size(); i++) { |
| // Add 1 since we need to have the null symbol that is not in the symbols |
| // list. |
| Elf_Word index = i + 1; |
| Elf_Word hash_val = static_cast<Elf_Word>(elfhash(symbols_[i].name_.c_str())) % nbuckets; |
| if (buckets[hash_val] == 0) { |
| buckets[hash_val] = index; |
| } else { |
| hash_val = buckets[hash_val]; |
| CHECK_LT(hash_val, chain_size); |
| while (chain[hash_val] != 0) { |
| hash_val = chain[hash_val]; |
| CHECK_LT(hash_val, chain_size); |
| } |
| chain[hash_val] = index; |
| // Check for loops. Works because if this is non-empty then there must be |
| // another cell which already contains the same symbol index as this one, |
| // which means some symbol has more then one name, which isn't allowed. |
| CHECK_EQ(chain[index], static_cast<Elf_Word>(0)); |
| } |
| } |
| |
| return hash; |
| } |
| |
| std::string GenerateStrtab() { |
| std::string tab; |
| tab += '\0'; |
| for (auto it = symbols_.begin(); it != symbols_.end(); ++it) { |
| it->name_idx_ = tab.size(); |
| tab += it->name_; |
| tab += '\0'; |
| } |
| strtab_.section_.sh_size = tab.size(); |
| return tab; |
| } |
| |
| std::vector<Elf_Sym> GenerateSymtab() { |
| std::vector<Elf_Sym> ret; |
| Elf_Sym undef_sym; |
| memset(&undef_sym, 0, sizeof(undef_sym)); |
| undef_sym.st_shndx = SHN_UNDEF; |
| ret.push_back(undef_sym); |
| |
| for (auto it = symbols_.cbegin(); it != symbols_.cend(); ++it) { |
| Elf_Sym sym; |
| memset(&sym, 0, sizeof(sym)); |
| sym.st_name = it->name_idx_; |
| if (it->is_relative_) { |
| sym.st_value = it->addr_ + it->section_->section_.sh_offset; |
| } else { |
| sym.st_value = it->addr_; |
| } |
| sym.st_size = it->size_; |
| sym.st_other = it->other_; |
| sym.st_shndx = it->section_->section_index_; |
| sym.st_info = it->info_; |
| |
| ret.push_back(sym); |
| } |
| return ret; |
| } |
| |
| Elf_Word GetSize() { |
| // 1 is for the implicit NULL symbol. |
| return symbols_.size() + 1; |
| } |
| |
| ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>* GetStrTab() { |
| return &strtab_; |
| } |
| |
| protected: |
| struct ElfSymbolState { |
| const std::string name_; |
| const ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>* section_; |
| Elf_Addr addr_; |
| Elf_Word size_; |
| bool is_relative_; |
| uint8_t info_; |
| uint8_t other_; |
| // Used during Write() to temporarially hold name index in the strtab. |
| Elf_Word name_idx_; |
| }; |
| |
| // Information for the strsym for dynstr sections. |
| const std::string str_name_; |
| Elf_Word str_type_; |
| // The symbols in the same order they will be in the symbol table. |
| std::vector<ElfSymbolState> symbols_; |
| ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> strtab_; |
| }; |
| |
| class CodeOutput { |
| public: |
| virtual bool Write(OutputStream* out) = 0; |
| virtual ~CodeOutput() {} |
| }; |
| |
| template <typename Elf_Word, typename Elf_Shdr> |
| static inline constexpr Elf_Word NextOffset(const Elf_Shdr& cur, const Elf_Shdr& prev) { |
| return RoundUp(prev.sh_size + prev.sh_offset, cur.sh_addralign); |
| } |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Addr, typename Elf_Dyn, |
| typename Elf_Sym, typename Elf_Ehdr, typename Elf_Phdr, typename Elf_Shdr> |
| class ElfBuilder FINAL { |
| public: |
| ElfBuilder(CodeOutput* oat_writer, |
| File* elf_file, |
| InstructionSet isa, |
| Elf_Word rodata_relative_offset, |
| Elf_Word rodata_size, |
| Elf_Word text_relative_offset, |
| Elf_Word text_size, |
| const bool add_symbols, |
| bool debug = false) |
| : oat_writer_(oat_writer), |
| elf_file_(elf_file), |
| add_symbols_(add_symbols), |
| debug_logging_(debug), |
| text_builder_(".text", text_size, text_relative_offset, SHT_PROGBITS, |
| SHF_ALLOC | SHF_EXECINSTR), |
| rodata_builder_(".rodata", rodata_size, rodata_relative_offset, SHT_PROGBITS, SHF_ALLOC), |
| dynsym_builder_(".dynsym", SHT_DYNSYM, ".dynstr", SHT_STRTAB, true), |
| symtab_builder_(".symtab", SHT_SYMTAB, ".strtab", SHT_STRTAB, false), |
| hash_builder_(".hash", SHT_HASH, SHF_ALLOC, &dynsym_builder_, 0, sizeof(Elf_Word), |
| sizeof(Elf_Word)), |
| dynamic_builder_(".dynamic", &dynsym_builder_), |
| shstrtab_builder_(".shstrtab", SHT_STRTAB, 0, NULL, 0, 1, 1) { |
| SetupEhdr(); |
| SetupDynamic(); |
| SetupRequiredSymbols(); |
| SetISA(isa); |
| } |
| ~ElfBuilder() {} |
| |
| bool Init() { |
| // The basic layout of the elf file. Order may be different in final output. |
| // +-------------------------+ |
| // | Elf_Ehdr | |
| // +-------------------------+ |
| // | Elf_Phdr PHDR | |
| // | Elf_Phdr LOAD R | .dynsym .dynstr .hash .rodata |
| // | Elf_Phdr LOAD R X | .text |
| // | Elf_Phdr LOAD RW | .dynamic |
| // | Elf_Phdr DYNAMIC | .dynamic |
| // +-------------------------+ |
| // | .dynsym | |
| // | Elf_Sym STN_UNDEF | |
| // | Elf_Sym oatdata | |
| // | Elf_Sym oatexec | |
| // | Elf_Sym oatlastword | |
| // +-------------------------+ |
| // | .dynstr | |
| // | \0 | |
| // | oatdata\0 | |
| // | oatexec\0 | |
| // | oatlastword\0 | |
| // | boot.oat\0 | |
| // +-------------------------+ |
| // | .hash | |
| // | Elf_Word nbucket = b | |
| // | Elf_Word nchain = c | |
| // | Elf_Word bucket[0] | |
| // | ... | |
| // | Elf_Word bucket[b - 1] | |
| // | Elf_Word chain[0] | |
| // | ... | |
| // | Elf_Word chain[c - 1] | |
| // +-------------------------+ |
| // | .rodata | |
| // | oatdata..oatexec-4 | |
| // +-------------------------+ |
| // | .text | |
| // | oatexec..oatlastword | |
| // +-------------------------+ |
| // | .dynamic | |
| // | Elf_Dyn DT_SONAME | |
| // | Elf_Dyn DT_HASH | |
| // | Elf_Dyn DT_SYMTAB | |
| // | Elf_Dyn DT_SYMENT | |
| // | Elf_Dyn DT_STRTAB | |
| // | Elf_Dyn DT_STRSZ | |
| // | Elf_Dyn DT_NULL | |
| // +-------------------------+ (Optional) |
| // | .strtab | (Optional) |
| // | program symbol names | (Optional) |
| // +-------------------------+ (Optional) |
| // | .symtab | (Optional) |
| // | program symbols | (Optional) |
| // +-------------------------+ |
| // | .shstrtab | |
| // | \0 | |
| // | .dynamic\0 | |
| // | .dynsym\0 | |
| // | .dynstr\0 | |
| // | .hash\0 | |
| // | .rodata\0 | |
| // | .text\0 | |
| // | .shstrtab\0 | |
| // | .symtab\0 | (Optional) |
| // | .strtab\0 | (Optional) |
| // | .debug_str\0 | (Optional) |
| // | .debug_info\0 | (Optional) |
| // | .eh_frame\0 | (Optional) |
| // | .debug_line\0 | (Optional) |
| // | .debug_abbrev\0 | (Optional) |
| // +-------------------------+ (Optional) |
| // | .debug_info | (Optional) |
| // +-------------------------+ (Optional) |
| // | .debug_abbrev | (Optional) |
| // +-------------------------+ (Optional) |
| // | .eh_frame | (Optional) |
| // +-------------------------+ (Optional) |
| // | .debug_line | (Optional) |
| // +-------------------------+ (Optional) |
| // | .debug_str | (Optional) |
| // +-------------------------+ (Optional) |
| // | Elf_Shdr NULL | |
| // | Elf_Shdr .dynsym | |
| // | Elf_Shdr .dynstr | |
| // | Elf_Shdr .hash | |
| // | Elf_Shdr .text | |
| // | Elf_Shdr .rodata | |
| // | Elf_Shdr .dynamic | |
| // | Elf_Shdr .shstrtab | |
| // | Elf_Shdr .debug_info | (Optional) |
| // | Elf_Shdr .debug_abbrev | (Optional) |
| // | Elf_Shdr .eh_frame | (Optional) |
| // | Elf_Shdr .debug_line | (Optional) |
| // | Elf_Shdr .debug_str | (Optional) |
| // +-------------------------+ |
| |
| if (fatal_error_) { |
| return false; |
| } |
| // Step 1. Figure out all the offsets. |
| |
| if (debug_logging_) { |
| LOG(INFO) << "phdr_offset=" << PHDR_OFFSET << std::hex << " " << PHDR_OFFSET; |
| LOG(INFO) << "phdr_size=" << PHDR_SIZE << std::hex << " " << PHDR_SIZE; |
| } |
| |
| memset(&program_headers_, 0, sizeof(program_headers_)); |
| program_headers_[PH_PHDR].p_type = PT_PHDR; |
| program_headers_[PH_PHDR].p_offset = PHDR_OFFSET; |
| program_headers_[PH_PHDR].p_vaddr = PHDR_OFFSET; |
| program_headers_[PH_PHDR].p_paddr = PHDR_OFFSET; |
| program_headers_[PH_PHDR].p_filesz = sizeof(program_headers_); |
| program_headers_[PH_PHDR].p_memsz = sizeof(program_headers_); |
| program_headers_[PH_PHDR].p_flags = PF_R; |
| program_headers_[PH_PHDR].p_align = sizeof(Elf_Word); |
| |
| program_headers_[PH_LOAD_R__].p_type = PT_LOAD; |
| program_headers_[PH_LOAD_R__].p_offset = 0; |
| program_headers_[PH_LOAD_R__].p_vaddr = 0; |
| program_headers_[PH_LOAD_R__].p_paddr = 0; |
| program_headers_[PH_LOAD_R__].p_flags = PF_R; |
| |
| program_headers_[PH_LOAD_R_X].p_type = PT_LOAD; |
| program_headers_[PH_LOAD_R_X].p_flags = PF_R | PF_X; |
| |
| program_headers_[PH_LOAD_RW_].p_type = PT_LOAD; |
| program_headers_[PH_LOAD_RW_].p_flags = PF_R | PF_W; |
| |
| program_headers_[PH_DYNAMIC].p_type = PT_DYNAMIC; |
| program_headers_[PH_DYNAMIC].p_flags = PF_R | PF_W; |
| |
| // Get the dynstr string. |
| dynstr_ = dynsym_builder_.GenerateStrtab(); |
| |
| // Add the SONAME to the dynstr. |
| dynstr_soname_offset_ = dynstr_.size(); |
| std::string file_name(elf_file_->GetPath()); |
| size_t directory_separator_pos = file_name.rfind('/'); |
| if (directory_separator_pos != std::string::npos) { |
| file_name = file_name.substr(directory_separator_pos + 1); |
| } |
| dynstr_ += file_name; |
| dynstr_ += '\0'; |
| if (debug_logging_) { |
| LOG(INFO) << "dynstr size (bytes) =" << dynstr_.size() |
| << std::hex << " " << dynstr_.size(); |
| LOG(INFO) << "dynsym size (elements)=" << dynsym_builder_.GetSize() |
| << std::hex << " " << dynsym_builder_.GetSize(); |
| } |
| |
| // Get the section header string table. |
| shstrtab_ += '\0'; |
| |
| // Setup sym_undef |
| memset(&null_hdr_, 0, sizeof(null_hdr_)); |
| null_hdr_.sh_type = SHT_NULL; |
| null_hdr_.sh_link = SHN_UNDEF; |
| section_ptrs_.push_back(&null_hdr_); |
| |
| section_index_ = 1; |
| |
| // setup .dynsym |
| section_ptrs_.push_back(&dynsym_builder_.section_); |
| AssignSectionStr(&dynsym_builder_, &shstrtab_); |
| dynsym_builder_.section_index_ = section_index_++; |
| |
| // Setup .dynstr |
| section_ptrs_.push_back(&dynsym_builder_.GetStrTab()->section_); |
| AssignSectionStr(dynsym_builder_.GetStrTab(), &shstrtab_); |
| dynsym_builder_.GetStrTab()->section_index_ = section_index_++; |
| |
| // Setup .hash |
| section_ptrs_.push_back(&hash_builder_.section_); |
| AssignSectionStr(&hash_builder_, &shstrtab_); |
| hash_builder_.section_index_ = section_index_++; |
| |
| // Setup .rodata |
| section_ptrs_.push_back(&rodata_builder_.section_); |
| AssignSectionStr(&rodata_builder_, &shstrtab_); |
| rodata_builder_.section_index_ = section_index_++; |
| |
| // Setup .text |
| section_ptrs_.push_back(&text_builder_.section_); |
| AssignSectionStr(&text_builder_, &shstrtab_); |
| text_builder_.section_index_ = section_index_++; |
| |
| // Setup .dynamic |
| section_ptrs_.push_back(&dynamic_builder_.section_); |
| AssignSectionStr(&dynamic_builder_, &shstrtab_); |
| dynamic_builder_.section_index_ = section_index_++; |
| |
| // Fill in the hash section. |
| hash_ = dynsym_builder_.GenerateHashContents(); |
| |
| if (debug_logging_) { |
| LOG(INFO) << ".hash size (bytes)=" << hash_.size() * sizeof(Elf_Word) |
| << std::hex << " " << hash_.size() * sizeof(Elf_Word); |
| } |
| |
| Elf_Word base_offset = sizeof(Elf_Ehdr) + sizeof(program_headers_); |
| |
| // Get the layout in the sections. |
| // |
| // Get the layout of the dynsym section. |
| dynsym_builder_.section_.sh_offset = RoundUp(base_offset, dynsym_builder_.section_.sh_addralign); |
| dynsym_builder_.section_.sh_addr = dynsym_builder_.section_.sh_offset; |
| dynsym_builder_.section_.sh_size = dynsym_builder_.GetSize() * sizeof(Elf_Sym); |
| dynsym_builder_.section_.sh_link = dynsym_builder_.GetLink(); |
| |
| // Get the layout of the dynstr section. |
| dynsym_builder_.GetStrTab()->section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr> |
| (dynsym_builder_.GetStrTab()->section_, |
| dynsym_builder_.section_); |
| dynsym_builder_.GetStrTab()->section_.sh_addr = dynsym_builder_.GetStrTab()->section_.sh_offset; |
| dynsym_builder_.GetStrTab()->section_.sh_size = dynstr_.size(); |
| dynsym_builder_.GetStrTab()->section_.sh_link = dynsym_builder_.GetStrTab()->GetLink(); |
| |
| // Get the layout of the hash section |
| hash_builder_.section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr> |
| (hash_builder_.section_, |
| dynsym_builder_.GetStrTab()->section_); |
| hash_builder_.section_.sh_addr = hash_builder_.section_.sh_offset; |
| hash_builder_.section_.sh_size = hash_.size() * sizeof(Elf_Word); |
| hash_builder_.section_.sh_link = hash_builder_.GetLink(); |
| |
| // Get the layout of the rodata section. |
| rodata_builder_.section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr> |
| (rodata_builder_.section_, |
| hash_builder_.section_); |
| rodata_builder_.section_.sh_addr = rodata_builder_.section_.sh_offset; |
| rodata_builder_.section_.sh_size = rodata_builder_.GetSize(); |
| rodata_builder_.section_.sh_link = rodata_builder_.GetLink(); |
| |
| // Get the layout of the text section. |
| text_builder_.section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr> |
| (text_builder_.section_, rodata_builder_.section_); |
| text_builder_.section_.sh_addr = text_builder_.section_.sh_offset; |
| text_builder_.section_.sh_size = text_builder_.GetSize(); |
| text_builder_.section_.sh_link = text_builder_.GetLink(); |
| CHECK_ALIGNED(rodata_builder_.section_.sh_offset + rodata_builder_.section_.sh_size, kPageSize); |
| |
| // Get the layout of the dynamic section. |
| dynamic_builder_.section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr> |
| (dynamic_builder_.section_, |
| text_builder_.section_); |
| dynamic_builder_.section_.sh_addr = dynamic_builder_.section_.sh_offset; |
| dynamic_builder_.section_.sh_size = dynamic_builder_.GetSize() * sizeof(Elf_Dyn); |
| dynamic_builder_.section_.sh_link = dynamic_builder_.GetLink(); |
| |
| if (debug_logging_) { |
| LOG(INFO) << "dynsym off=" << dynsym_builder_.section_.sh_offset |
| << " dynsym size=" << dynsym_builder_.section_.sh_size; |
| LOG(INFO) << "dynstr off=" << dynsym_builder_.GetStrTab()->section_.sh_offset |
| << " dynstr size=" << dynsym_builder_.GetStrTab()->section_.sh_size; |
| LOG(INFO) << "hash off=" << hash_builder_.section_.sh_offset |
| << " hash size=" << hash_builder_.section_.sh_size; |
| LOG(INFO) << "rodata off=" << rodata_builder_.section_.sh_offset |
| << " rodata size=" << rodata_builder_.section_.sh_size; |
| LOG(INFO) << "text off=" << text_builder_.section_.sh_offset |
| << " text size=" << text_builder_.section_.sh_size; |
| LOG(INFO) << "dynamic off=" << dynamic_builder_.section_.sh_offset |
| << " dynamic size=" << dynamic_builder_.section_.sh_size; |
| } |
| |
| return true; |
| } |
| |
| bool Write() { |
| std::vector<ElfFilePiece> pieces; |
| Elf_Shdr prev = dynamic_builder_.section_; |
| std::string strtab; |
| |
| if (IncludingDebugSymbols()) { |
| // Setup .symtab |
| section_ptrs_.push_back(&symtab_builder_.section_); |
| AssignSectionStr(&symtab_builder_, &shstrtab_); |
| symtab_builder_.section_index_ = section_index_++; |
| |
| // Setup .strtab |
| section_ptrs_.push_back(&symtab_builder_.GetStrTab()->section_); |
| AssignSectionStr(symtab_builder_.GetStrTab(), &shstrtab_); |
| symtab_builder_.GetStrTab()->section_index_ = section_index_++; |
| |
| strtab = symtab_builder_.GenerateStrtab(); |
| if (debug_logging_) { |
| LOG(INFO) << "strtab size (bytes) =" << strtab.size() |
| << std::hex << " " << strtab.size(); |
| LOG(INFO) << "symtab size (elements) =" << symtab_builder_.GetSize() |
| << std::hex << " " << symtab_builder_.GetSize(); |
| } |
| } |
| |
| // Setup all the other sections. |
| for (ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> *builder = other_builders_.data(), |
| *end = builder + other_builders_.size(); |
| builder != end; ++builder) { |
| section_ptrs_.push_back(&builder->section_); |
| AssignSectionStr(builder, &shstrtab_); |
| builder->section_index_ = section_index_++; |
| } |
| |
| // Setup shstrtab |
| section_ptrs_.push_back(&shstrtab_builder_.section_); |
| AssignSectionStr(&shstrtab_builder_, &shstrtab_); |
| shstrtab_builder_.section_index_ = section_index_++; |
| |
| if (debug_logging_) { |
| LOG(INFO) << ".shstrtab size (bytes) =" << shstrtab_.size() |
| << std::hex << " " << shstrtab_.size(); |
| LOG(INFO) << "section list size (elements)=" << section_ptrs_.size() |
| << std::hex << " " << section_ptrs_.size(); |
| } |
| |
| if (IncludingDebugSymbols()) { |
| // Get the layout of the symtab section. |
| symtab_builder_.section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr> |
| (symtab_builder_.section_, |
| dynamic_builder_.section_); |
| symtab_builder_.section_.sh_addr = 0; |
| // Add to leave space for the null symbol. |
| symtab_builder_.section_.sh_size = symtab_builder_.GetSize() * sizeof(Elf_Sym); |
| symtab_builder_.section_.sh_link = symtab_builder_.GetLink(); |
| |
| // Get the layout of the dynstr section. |
| symtab_builder_.GetStrTab()->section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr> |
| (symtab_builder_.GetStrTab()->section_, |
| symtab_builder_.section_); |
| symtab_builder_.GetStrTab()->section_.sh_addr = 0; |
| symtab_builder_.GetStrTab()->section_.sh_size = strtab.size(); |
| symtab_builder_.GetStrTab()->section_.sh_link = symtab_builder_.GetStrTab()->GetLink(); |
| |
| prev = symtab_builder_.GetStrTab()->section_; |
| if (debug_logging_) { |
| LOG(INFO) << "symtab off=" << symtab_builder_.section_.sh_offset |
| << " symtab size=" << symtab_builder_.section_.sh_size; |
| LOG(INFO) << "strtab off=" << symtab_builder_.GetStrTab()->section_.sh_offset |
| << " strtab size=" << symtab_builder_.GetStrTab()->section_.sh_size; |
| } |
| } |
| |
| // Get the layout of the extra sections. (This will deal with the debug |
| // sections if they are there) |
| for (auto it = other_builders_.begin(); it != other_builders_.end(); ++it) { |
| it->section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr>(it->section_, prev); |
| it->section_.sh_addr = 0; |
| it->section_.sh_size = it->GetBuffer()->size(); |
| it->section_.sh_link = it->GetLink(); |
| pieces.push_back(ElfFilePiece(it->name_, it->section_.sh_offset, |
| it->GetBuffer()->data(), it->GetBuffer()->size())); |
| prev = it->section_; |
| if (debug_logging_) { |
| LOG(INFO) << it->name_ << " off=" << it->section_.sh_offset |
| << " size=" << it->section_.sh_size; |
| } |
| } |
| |
| // Get the layout of the shstrtab section |
| shstrtab_builder_.section_.sh_offset = NextOffset<Elf_Word, Elf_Shdr> |
| (shstrtab_builder_.section_, prev); |
| shstrtab_builder_.section_.sh_addr = 0; |
| shstrtab_builder_.section_.sh_size = shstrtab_.size(); |
| shstrtab_builder_.section_.sh_link = shstrtab_builder_.GetLink(); |
| if (debug_logging_) { |
| LOG(INFO) << "shstrtab off=" << shstrtab_builder_.section_.sh_offset |
| << " shstrtab size=" << shstrtab_builder_.section_.sh_size; |
| } |
| |
| // The section list comes after come after. |
| Elf_Word sections_offset = RoundUp( |
| shstrtab_builder_.section_.sh_offset + shstrtab_builder_.section_.sh_size, |
| sizeof(Elf_Word)); |
| |
| // Setup the actual symbol arrays. |
| std::vector<Elf_Sym> dynsym = dynsym_builder_.GenerateSymtab(); |
| CHECK_EQ(dynsym.size() * sizeof(Elf_Sym), dynsym_builder_.section_.sh_size); |
| std::vector<Elf_Sym> symtab; |
| if (IncludingDebugSymbols()) { |
| symtab = symtab_builder_.GenerateSymtab(); |
| CHECK_EQ(symtab.size() * sizeof(Elf_Sym), symtab_builder_.section_.sh_size); |
| } |
| |
| // Setup the dynamic section. |
| // This will add the 2 values we cannot know until now time, namely the size |
| // and the soname_offset. |
| std::vector<Elf_Dyn> dynamic = dynamic_builder_.GetDynamics(dynstr_.size(), |
| dynstr_soname_offset_); |
| CHECK_EQ(dynamic.size() * sizeof(Elf_Dyn), dynamic_builder_.section_.sh_size); |
| |
| // Finish setup of the program headers now that we know the layout of the |
| // whole file. |
| Elf_Word load_r_size = rodata_builder_.section_.sh_offset + rodata_builder_.section_.sh_size; |
| program_headers_[PH_LOAD_R__].p_filesz = load_r_size; |
| program_headers_[PH_LOAD_R__].p_memsz = load_r_size; |
| program_headers_[PH_LOAD_R__].p_align = rodata_builder_.section_.sh_addralign; |
| |
| Elf_Word load_rx_size = text_builder_.section_.sh_size; |
| program_headers_[PH_LOAD_R_X].p_offset = text_builder_.section_.sh_offset; |
| program_headers_[PH_LOAD_R_X].p_vaddr = text_builder_.section_.sh_offset; |
| program_headers_[PH_LOAD_R_X].p_paddr = text_builder_.section_.sh_offset; |
| program_headers_[PH_LOAD_R_X].p_filesz = load_rx_size; |
| program_headers_[PH_LOAD_R_X].p_memsz = load_rx_size; |
| program_headers_[PH_LOAD_R_X].p_align = text_builder_.section_.sh_addralign; |
| |
| program_headers_[PH_LOAD_RW_].p_offset = dynamic_builder_.section_.sh_offset; |
| program_headers_[PH_LOAD_RW_].p_vaddr = dynamic_builder_.section_.sh_offset; |
| program_headers_[PH_LOAD_RW_].p_paddr = dynamic_builder_.section_.sh_offset; |
| program_headers_[PH_LOAD_RW_].p_filesz = dynamic_builder_.section_.sh_size; |
| program_headers_[PH_LOAD_RW_].p_memsz = dynamic_builder_.section_.sh_size; |
| program_headers_[PH_LOAD_RW_].p_align = dynamic_builder_.section_.sh_addralign; |
| |
| program_headers_[PH_DYNAMIC].p_offset = dynamic_builder_.section_.sh_offset; |
| program_headers_[PH_DYNAMIC].p_vaddr = dynamic_builder_.section_.sh_offset; |
| program_headers_[PH_DYNAMIC].p_paddr = dynamic_builder_.section_.sh_offset; |
| program_headers_[PH_DYNAMIC].p_filesz = dynamic_builder_.section_.sh_size; |
| program_headers_[PH_DYNAMIC].p_memsz = dynamic_builder_.section_.sh_size; |
| program_headers_[PH_DYNAMIC].p_align = dynamic_builder_.section_.sh_addralign; |
| |
| // Finish setup of the Ehdr values. |
| elf_header_.e_phoff = PHDR_OFFSET; |
| elf_header_.e_shoff = sections_offset; |
| elf_header_.e_phnum = PH_NUM; |
| elf_header_.e_shnum = section_ptrs_.size(); |
| elf_header_.e_shstrndx = shstrtab_builder_.section_index_; |
| |
| // Add the rest of the pieces to the list. |
| pieces.push_back(ElfFilePiece("Elf Header", 0, &elf_header_, sizeof(elf_header_))); |
| pieces.push_back(ElfFilePiece("Program headers", PHDR_OFFSET, |
| &program_headers_, sizeof(program_headers_))); |
| pieces.push_back(ElfFilePiece(".dynamic", dynamic_builder_.section_.sh_offset, |
| dynamic.data(), dynamic_builder_.section_.sh_size)); |
| pieces.push_back(ElfFilePiece(".dynsym", dynsym_builder_.section_.sh_offset, |
| dynsym.data(), dynsym.size() * sizeof(Elf_Sym))); |
| pieces.push_back(ElfFilePiece(".dynstr", dynsym_builder_.GetStrTab()->section_.sh_offset, |
| dynstr_.c_str(), dynstr_.size())); |
| pieces.push_back(ElfFilePiece(".hash", hash_builder_.section_.sh_offset, |
| hash_.data(), hash_.size() * sizeof(Elf_Word))); |
| pieces.push_back(ElfFilePiece(".rodata", rodata_builder_.section_.sh_offset, |
| nullptr, rodata_builder_.section_.sh_size)); |
| pieces.push_back(ElfFilePiece(".text", text_builder_.section_.sh_offset, |
| nullptr, text_builder_.section_.sh_size)); |
| if (IncludingDebugSymbols()) { |
| pieces.push_back(ElfFilePiece(".symtab", symtab_builder_.section_.sh_offset, |
| symtab.data(), symtab.size() * sizeof(Elf_Sym))); |
| pieces.push_back(ElfFilePiece(".strtab", symtab_builder_.GetStrTab()->section_.sh_offset, |
| strtab.c_str(), strtab.size())); |
| } |
| pieces.push_back(ElfFilePiece(".shstrtab", shstrtab_builder_.section_.sh_offset, |
| &shstrtab_[0], shstrtab_.size())); |
| for (uint32_t i = 0; i < section_ptrs_.size(); ++i) { |
| // Just add all the sections in induvidually since they are all over the |
| // place on the heap/stack. |
| Elf_Word cur_off = sections_offset + i * sizeof(Elf_Shdr); |
| pieces.push_back(ElfFilePiece("section table piece", cur_off, |
| section_ptrs_[i], sizeof(Elf_Shdr))); |
| } |
| |
| if (!WriteOutFile(pieces)) { |
| LOG(ERROR) << "Unable to write to file " << elf_file_->GetPath(); |
| return false; |
| } |
| // write out the actual oat file data. |
| Elf_Word oat_data_offset = rodata_builder_.section_.sh_offset; |
| if (static_cast<off_t>(oat_data_offset) != lseek(elf_file_->Fd(), oat_data_offset, SEEK_SET)) { |
| PLOG(ERROR) << "Failed to seek to .rodata offset " << oat_data_offset |
| << " for " << elf_file_->GetPath(); |
| return false; |
| } |
| std::unique_ptr<BufferedOutputStream> output_stream( |
| new BufferedOutputStream(new FileOutputStream(elf_file_))); |
| if (!oat_writer_->Write(output_stream.get())) { |
| PLOG(ERROR) << "Failed to write .rodata and .text for " << elf_file_->GetPath(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| // Adds the given raw section to the builder. This will copy it. The caller |
| // is responsible for deallocating their copy. |
| void RegisterRawSection(ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> bld) { |
| other_builders_.push_back(bld); |
| } |
| |
| private: |
| CodeOutput* oat_writer_; |
| File* elf_file_; |
| const bool add_symbols_; |
| const bool debug_logging_; |
| |
| bool fatal_error_ = false; |
| |
| // What phdr is. |
| static const uint32_t PHDR_OFFSET = sizeof(Elf_Ehdr); |
| enum : uint8_t { |
| PH_PHDR = 0, |
| PH_LOAD_R__ = 1, |
| PH_LOAD_R_X = 2, |
| PH_LOAD_RW_ = 3, |
| PH_DYNAMIC = 4, |
| PH_NUM = 5, |
| }; |
| static const uint32_t PHDR_SIZE = sizeof(Elf_Phdr) * PH_NUM; |
| Elf_Phdr program_headers_[PH_NUM]; |
| |
| Elf_Ehdr elf_header_; |
| |
| Elf_Shdr null_hdr_; |
| std::string shstrtab_; |
| uint32_t section_index_; |
| std::string dynstr_; |
| uint32_t dynstr_soname_offset_; |
| std::vector<Elf_Shdr*> section_ptrs_; |
| std::vector<Elf_Word> hash_; |
| |
| public: |
| ElfOatSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> text_builder_; |
| ElfOatSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> rodata_builder_; |
| ElfSymtabBuilder<Elf_Word, Elf_Sword, Elf_Addr, Elf_Sym, Elf_Shdr> dynsym_builder_; |
| ElfSymtabBuilder<Elf_Word, Elf_Sword, Elf_Addr, Elf_Sym, Elf_Shdr> symtab_builder_; |
| ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> hash_builder_; |
| ElfDynamicBuilder<Elf_Word, Elf_Sword, Elf_Dyn, Elf_Shdr> dynamic_builder_; |
| ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> shstrtab_builder_; |
| std::vector<ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr>> other_builders_; |
| |
| private: |
| void SetISA(InstructionSet isa) { |
| switch (isa) { |
| case kArm: |
| // Fall through. |
| case kThumb2: { |
| elf_header_.e_machine = EM_ARM; |
| elf_header_.e_flags = EF_ARM_EABI_VER5; |
| break; |
| } |
| case kArm64: { |
| elf_header_.e_machine = EM_AARCH64; |
| elf_header_.e_flags = 0; |
| break; |
| } |
| case kX86: { |
| elf_header_.e_machine = EM_386; |
| elf_header_.e_flags = 0; |
| break; |
| } |
| case kX86_64: { |
| elf_header_.e_machine = EM_X86_64; |
| elf_header_.e_flags = 0; |
| break; |
| } |
| case kMips: { |
| elf_header_.e_machine = EM_MIPS; |
| elf_header_.e_flags = (EF_MIPS_NOREORDER | |
| EF_MIPS_PIC | |
| EF_MIPS_CPIC | |
| EF_MIPS_ABI_O32 | |
| EF_MIPS_ARCH_32R2); |
| break; |
| } |
| default: { |
| fatal_error_ = true; |
| LOG(FATAL) << "Unknown instruction set: " << isa; |
| break; |
| } |
| } |
| } |
| |
| void SetupEhdr() { |
| memset(&elf_header_, 0, sizeof(elf_header_)); |
| elf_header_.e_ident[EI_MAG0] = ELFMAG0; |
| elf_header_.e_ident[EI_MAG1] = ELFMAG1; |
| elf_header_.e_ident[EI_MAG2] = ELFMAG2; |
| elf_header_.e_ident[EI_MAG3] = ELFMAG3; |
| elf_header_.e_ident[EI_CLASS] = ELFCLASS32; |
| elf_header_.e_ident[EI_DATA] = ELFDATA2LSB; |
| elf_header_.e_ident[EI_VERSION] = EV_CURRENT; |
| elf_header_.e_ident[EI_OSABI] = ELFOSABI_LINUX; |
| elf_header_.e_ident[EI_ABIVERSION] = 0; |
| elf_header_.e_type = ET_DYN; |
| elf_header_.e_version = 1; |
| elf_header_.e_entry = 0; |
| elf_header_.e_ehsize = sizeof(Elf_Ehdr); |
| elf_header_.e_phentsize = sizeof(Elf_Phdr); |
| elf_header_.e_shentsize = sizeof(Elf_Shdr); |
| elf_header_.e_phoff = sizeof(Elf_Ehdr); |
| } |
| |
| // Sets up a bunch of the required Dynamic Section entries. |
| // Namely it will initialize all the mandatory ones that it can. |
| // Specifically: |
| // DT_HASH |
| // DT_STRTAB |
| // DT_SYMTAB |
| // DT_SYMENT |
| // |
| // Some such as DT_SONAME, DT_STRSZ and DT_NULL will be put in later. |
| void SetupDynamic() { |
| dynamic_builder_.AddDynamicTag(DT_HASH, 0, &hash_builder_); |
| dynamic_builder_.AddDynamicTag(DT_STRTAB, 0, dynsym_builder_.GetStrTab()); |
| dynamic_builder_.AddDynamicTag(DT_SYMTAB, 0, &dynsym_builder_); |
| dynamic_builder_.AddDynamicTag(DT_SYMENT, sizeof(Elf_Sym)); |
| } |
| |
| // Sets up the basic dynamic symbols that are needed, namely all those we |
| // can know already. |
| // |
| // Specifically adds: |
| // oatdata |
| // oatexec |
| // oatlastword |
| void SetupRequiredSymbols() { |
| dynsym_builder_.AddSymbol("oatdata", &rodata_builder_, 0, true, |
| rodata_builder_.GetSize(), STB_GLOBAL, STT_OBJECT); |
| dynsym_builder_.AddSymbol("oatexec", &text_builder_, 0, true, |
| text_builder_.GetSize(), STB_GLOBAL, STT_OBJECT); |
| dynsym_builder_.AddSymbol("oatlastword", &text_builder_, text_builder_.GetSize() - 4, |
| true, 4, STB_GLOBAL, STT_OBJECT); |
| } |
| |
| void AssignSectionStr(ElfSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> *builder, |
| std::string* strtab) { |
| builder->section_.sh_name = strtab->size(); |
| *strtab += builder->name_; |
| *strtab += '\0'; |
| if (debug_logging_) { |
| LOG(INFO) << "adding section name \"" << builder->name_ << "\" " |
| << "to shstrtab at offset " << builder->section_.sh_name; |
| } |
| } |
| |
| struct ElfFilePiece { |
| ElfFilePiece(const std::string& name, Elf_Word offset, const void* data, Elf_Word size) |
| : dbg_name_(name), offset_(offset), data_(data), size_(size) {} |
| ~ElfFilePiece() {} |
| |
| const std::string& dbg_name_; |
| Elf_Word offset_; |
| const void *data_; |
| Elf_Word size_; |
| static bool Compare(ElfFilePiece a, ElfFilePiece b) { |
| return a.offset_ < b.offset_; |
| } |
| }; |
| |
| // Write each of the pieces out to the file. |
| bool WriteOutFile(const std::vector<ElfFilePiece>& pieces) { |
| // TODO It would be nice if this checked for overlap. |
| for (auto it = pieces.begin(); it != pieces.end(); ++it) { |
| if (it->data_) { |
| if (static_cast<off_t>(it->offset_) != lseek(elf_file_->Fd(), it->offset_, SEEK_SET)) { |
| PLOG(ERROR) << "Failed to seek to " << it->dbg_name_ << " offset location " |
| << it->offset_ << " for " << elf_file_->GetPath(); |
| return false; |
| } |
| if (!elf_file_->WriteFully(it->data_, it->size_)) { |
| PLOG(ERROR) << "Failed to write " << it->dbg_name_ << " for " << elf_file_->GetPath(); |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool IncludingDebugSymbols() { return add_symbols_ && symtab_builder_.GetSize() > 1; } |
| }; |
| |
| } // namespace art |
| |
| #endif // ART_COMPILER_ELF_BUILDER_H_ |