Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 1 | /* |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 2 | * Copyright (C) 2015 The Android Open Source Project |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef ART_COMPILER_ELF_BUILDER_H_ |
| 18 | #define ART_COMPILER_ELF_BUILDER_H_ |
| 19 | |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 20 | #include <vector> |
| 21 | |
Ian Rogers | d582fa4 | 2014-11-05 23:46:43 -0800 | [diff] [blame] | 22 | #include "arch/instruction_set.h" |
David Srbecky | 5d81120 | 2016-03-08 13:21:22 +0000 | [diff] [blame] | 23 | #include "arch/mips/instruction_set_features_mips.h" |
David Brazdil | d9c9037 | 2016-09-14 16:53:55 +0100 | [diff] [blame] | 24 | #include "base/array_ref.h" |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 25 | #include "base/bit_utils.h" |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 26 | #include "base/casts.h" |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 27 | #include "base/unix_file/fd_file.h" |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 28 | #include "elf_utils.h" |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 29 | #include "leb128.h" |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 30 | #include "linker/error_delaying_output_stream.h" |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 31 | |
| 32 | namespace art { |
| 33 | |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 34 | // Writes ELF file. |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 35 | // |
| 36 | // The basic layout of the elf file: |
| 37 | // Elf_Ehdr - The ELF header. |
| 38 | // Elf_Phdr[] - Program headers for the linker. |
| 39 | // .rodata - DEX files and oat metadata. |
| 40 | // .text - Compiled code. |
| 41 | // .bss - Zero-initialized writeable section. |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 42 | // .MIPS.abiflags - MIPS specific section. |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 43 | // .dynstr - Names for .dynsym. |
| 44 | // .dynsym - A few oat-specific dynamic symbols. |
| 45 | // .hash - Hash-table for .dynsym. |
| 46 | // .dynamic - Tags which let the linker locate .dynsym. |
| 47 | // .strtab - Names for .symtab. |
| 48 | // .symtab - Debug symbols. |
| 49 | // .eh_frame - Unwind information (CFI). |
| 50 | // .eh_frame_hdr - Index of .eh_frame. |
| 51 | // .debug_frame - Unwind information (CFI). |
| 52 | // .debug_frame.oat_patches - Addresses for relocation. |
| 53 | // .debug_info - Debug information. |
| 54 | // .debug_info.oat_patches - Addresses for relocation. |
| 55 | // .debug_abbrev - Decoding information for .debug_info. |
| 56 | // .debug_str - Strings for .debug_info. |
| 57 | // .debug_line - Line number tables. |
| 58 | // .debug_line.oat_patches - Addresses for relocation. |
| 59 | // .text.oat_patches - Addresses for relocation. |
| 60 | // .shstrtab - Names of ELF sections. |
| 61 | // Elf_Shdr[] - Section headers. |
| 62 | // |
| 63 | // Some section are optional (the debug sections in particular). |
| 64 | // |
| 65 | // We try write the section data directly into the file without much |
| 66 | // in-memory buffering. This means we generally write sections based on the |
| 67 | // dependency order (e.g. .dynamic points to .dynsym which points to .text). |
| 68 | // |
| 69 | // In the cases where we need to buffer, we write the larger section first |
| 70 | // and buffer the smaller one (e.g. .strtab is bigger than .symtab). |
| 71 | // |
| 72 | // The debug sections are written last for easier stripping. |
| 73 | // |
David Srbecky | 533c207 | 2015-04-22 12:20:22 +0100 | [diff] [blame] | 74 | template <typename ElfTypes> |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 75 | class ElfBuilder FINAL { |
| 76 | public: |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 77 | static constexpr size_t kMaxProgramHeaders = 16; |
David Srbecky | 533c207 | 2015-04-22 12:20:22 +0100 | [diff] [blame] | 78 | using Elf_Addr = typename ElfTypes::Addr; |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 79 | using Elf_Off = typename ElfTypes::Off; |
David Srbecky | 533c207 | 2015-04-22 12:20:22 +0100 | [diff] [blame] | 80 | using Elf_Word = typename ElfTypes::Word; |
| 81 | using Elf_Sword = typename ElfTypes::Sword; |
| 82 | using Elf_Ehdr = typename ElfTypes::Ehdr; |
| 83 | using Elf_Shdr = typename ElfTypes::Shdr; |
| 84 | using Elf_Sym = typename ElfTypes::Sym; |
| 85 | using Elf_Phdr = typename ElfTypes::Phdr; |
| 86 | using Elf_Dyn = typename ElfTypes::Dyn; |
| 87 | |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 88 | // Base class of all sections. |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 89 | class Section : public OutputStream { |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 90 | public: |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 91 | Section(ElfBuilder<ElfTypes>* owner, |
| 92 | const std::string& name, |
| 93 | Elf_Word type, |
| 94 | Elf_Word flags, |
| 95 | const Section* link, |
| 96 | Elf_Word info, |
| 97 | Elf_Word align, |
| 98 | Elf_Word entsize) |
| 99 | : OutputStream(name), |
| 100 | owner_(owner), |
| 101 | header_(), |
| 102 | section_index_(0), |
| 103 | name_(name), |
| 104 | link_(link), |
| 105 | started_(false), |
| 106 | finished_(false), |
| 107 | phdr_flags_(PF_R), |
| 108 | phdr_type_(0) { |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 109 | DCHECK_GE(align, 1u); |
David Srbecky | 491a7fe | 2015-05-28 00:59:08 +0100 | [diff] [blame] | 110 | header_.sh_type = type; |
| 111 | header_.sh_flags = flags; |
| 112 | header_.sh_info = info; |
| 113 | header_.sh_addralign = align; |
| 114 | header_.sh_entsize = entsize; |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 115 | } |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 116 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 117 | // Start writing of this section. |
| 118 | void Start() { |
| 119 | CHECK(!started_); |
| 120 | CHECK(!finished_); |
| 121 | started_ = true; |
| 122 | auto& sections = owner_->sections_; |
| 123 | // Check that the previous section is complete. |
| 124 | CHECK(sections.empty() || sections.back()->finished_); |
| 125 | // The first ELF section index is 1. Index 0 is reserved for NULL. |
| 126 | section_index_ = sections.size() + 1; |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 127 | // Page-align if we switch between allocated and non-allocated sections, |
| 128 | // or if we change the type of allocation (e.g. executable vs non-executable). |
| 129 | if (!sections.empty()) { |
| 130 | if (header_.sh_flags != sections.back()->header_.sh_flags) { |
| 131 | header_.sh_addralign = kPageSize; |
| 132 | } |
| 133 | } |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 134 | // Align file position. |
| 135 | if (header_.sh_type != SHT_NOBITS) { |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 136 | header_.sh_offset = owner_->AlignFileOffset(header_.sh_addralign); |
| 137 | } else { |
| 138 | header_.sh_offset = 0; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 139 | } |
| 140 | // Align virtual memory address. |
| 141 | if ((header_.sh_flags & SHF_ALLOC) != 0) { |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 142 | header_.sh_addr = owner_->AlignVirtualAddress(header_.sh_addralign); |
| 143 | } else { |
| 144 | header_.sh_addr = 0; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 145 | } |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 146 | // Push this section on the list of written sections. |
| 147 | sections.push_back(this); |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 148 | } |
| 149 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 150 | // Finish writing of this section. |
| 151 | void End() { |
| 152 | CHECK(started_); |
| 153 | CHECK(!finished_); |
| 154 | finished_ = true; |
| 155 | if (header_.sh_type == SHT_NOBITS) { |
| 156 | CHECK_GT(header_.sh_size, 0u); |
| 157 | } else { |
| 158 | // Use the current file position to determine section size. |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 159 | off_t file_offset = owner_->stream_.Seek(0, kSeekCurrent); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 160 | CHECK_GE(file_offset, (off_t)header_.sh_offset); |
| 161 | header_.sh_size = file_offset - header_.sh_offset; |
| 162 | } |
| 163 | if ((header_.sh_flags & SHF_ALLOC) != 0) { |
| 164 | owner_->virtual_address_ += header_.sh_size; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | // Get the location of this section in virtual memory. |
| 169 | Elf_Addr GetAddress() const { |
| 170 | CHECK(started_); |
| 171 | return header_.sh_addr; |
| 172 | } |
| 173 | |
| 174 | // Returns the size of the content of this section. |
| 175 | Elf_Word GetSize() const { |
David Srbecky | b851b49 | 2015-11-11 20:19:38 +0000 | [diff] [blame] | 176 | if (finished_) { |
| 177 | return header_.sh_size; |
| 178 | } else { |
| 179 | CHECK(started_); |
| 180 | CHECK_NE(header_.sh_type, (Elf_Word)SHT_NOBITS); |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 181 | return owner_->stream_.Seek(0, kSeekCurrent) - header_.sh_offset; |
David Srbecky | b851b49 | 2015-11-11 20:19:38 +0000 | [diff] [blame] | 182 | } |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 183 | } |
| 184 | |
David Srbecky | 5b1c2ca | 2016-01-25 17:32:41 +0000 | [diff] [blame] | 185 | // Write this section as "NOBITS" section. (used for the .bss section) |
| 186 | // This means that the ELF file does not contain the initial data for this section |
| 187 | // and it will be zero-initialized when the ELF file is loaded in the running program. |
| 188 | void WriteNoBitsSection(Elf_Word size) { |
| 189 | DCHECK_NE(header_.sh_flags & SHF_ALLOC, 0u); |
David Srbecky | 5b1c2ca | 2016-01-25 17:32:41 +0000 | [diff] [blame] | 190 | header_.sh_type = SHT_NOBITS; |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 191 | Start(); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 192 | header_.sh_size = size; |
David Srbecky | 5b1c2ca | 2016-01-25 17:32:41 +0000 | [diff] [blame] | 193 | End(); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | // This function always succeeds to simplify code. |
| 197 | // Use builder's Good() to check the actual status. |
| 198 | bool WriteFully(const void* buffer, size_t byte_count) OVERRIDE { |
| 199 | CHECK(started_); |
| 200 | CHECK(!finished_); |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 201 | return owner_->stream_.WriteFully(buffer, byte_count); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 202 | } |
| 203 | |
| 204 | // This function always succeeds to simplify code. |
| 205 | // Use builder's Good() to check the actual status. |
| 206 | off_t Seek(off_t offset, Whence whence) OVERRIDE { |
| 207 | // Forward the seek as-is and trust the caller to use it reasonably. |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 208 | return owner_->stream_.Seek(offset, whence); |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 209 | } |
| 210 | |
Vladimir Marko | 10c1356 | 2015-11-25 14:33:36 +0000 | [diff] [blame] | 211 | // This function flushes the output and returns whether it succeeded. |
| 212 | // If there was a previous failure, this does nothing and returns false, i.e. failed. |
| 213 | bool Flush() OVERRIDE { |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 214 | return owner_->stream_.Flush(); |
Vladimir Marko | 10c1356 | 2015-11-25 14:33:36 +0000 | [diff] [blame] | 215 | } |
| 216 | |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 217 | Elf_Word GetSectionIndex() const { |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 218 | DCHECK(started_); |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 219 | DCHECK_NE(section_index_, 0u); |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 220 | return section_index_; |
| 221 | } |
| 222 | |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 223 | private: |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 224 | ElfBuilder<ElfTypes>* owner_; |
David Srbecky | 491a7fe | 2015-05-28 00:59:08 +0100 | [diff] [blame] | 225 | Elf_Shdr header_; |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 226 | Elf_Word section_index_; |
| 227 | const std::string name_; |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 228 | const Section* const link_; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 229 | bool started_; |
| 230 | bool finished_; |
| 231 | Elf_Word phdr_flags_; |
| 232 | Elf_Word phdr_type_; |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 233 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 234 | friend class ElfBuilder; |
David Srbecky | 4d247f7 | 2015-11-09 11:56:52 +0000 | [diff] [blame] | 235 | |
| 236 | DISALLOW_COPY_AND_ASSIGN(Section); |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 237 | }; |
| 238 | |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 239 | class CachedSection : public Section { |
| 240 | public: |
| 241 | CachedSection(ElfBuilder<ElfTypes>* owner, |
| 242 | const std::string& name, |
| 243 | Elf_Word type, |
| 244 | Elf_Word flags, |
| 245 | const Section* link, |
| 246 | Elf_Word info, |
| 247 | Elf_Word align, |
| 248 | Elf_Word entsize) |
| 249 | : Section(owner, name, type, flags, link, info, align, entsize), cache_() { } |
| 250 | |
| 251 | Elf_Word Add(const void* data, size_t length) { |
| 252 | Elf_Word offset = cache_.size(); |
| 253 | const uint8_t* d = reinterpret_cast<const uint8_t*>(data); |
| 254 | cache_.insert(cache_.end(), d, d + length); |
| 255 | return offset; |
| 256 | } |
| 257 | |
| 258 | Elf_Word GetCacheSize() { |
| 259 | return cache_.size(); |
| 260 | } |
| 261 | |
| 262 | void Write() { |
| 263 | this->WriteFully(cache_.data(), cache_.size()); |
| 264 | cache_.clear(); |
| 265 | cache_.shrink_to_fit(); |
| 266 | } |
| 267 | |
| 268 | void WriteCachedSection() { |
| 269 | this->Start(); |
| 270 | Write(); |
| 271 | this->End(); |
| 272 | } |
| 273 | |
| 274 | private: |
| 275 | std::vector<uint8_t> cache_; |
| 276 | }; |
| 277 | |
| 278 | // Writer of .dynstr section. |
| 279 | class CachedStringSection FINAL : public CachedSection { |
| 280 | public: |
| 281 | CachedStringSection(ElfBuilder<ElfTypes>* owner, |
| 282 | const std::string& name, |
| 283 | Elf_Word flags, |
| 284 | Elf_Word align) |
| 285 | : CachedSection(owner, |
| 286 | name, |
| 287 | SHT_STRTAB, |
| 288 | flags, |
| 289 | /* link */ nullptr, |
| 290 | /* info */ 0, |
| 291 | align, |
| 292 | /* entsize */ 0) { } |
| 293 | |
| 294 | Elf_Word Add(const std::string& name) { |
| 295 | if (CachedSection::GetCacheSize() == 0u) { |
| 296 | DCHECK(name.empty()); |
| 297 | } |
| 298 | return CachedSection::Add(name.c_str(), name.length() + 1); |
| 299 | } |
| 300 | }; |
| 301 | |
| 302 | // Writer of .strtab and .shstrtab sections. |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 303 | class StringSection FINAL : public Section { |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 304 | public: |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 305 | StringSection(ElfBuilder<ElfTypes>* owner, |
| 306 | const std::string& name, |
| 307 | Elf_Word flags, |
| 308 | Elf_Word align) |
| 309 | : Section(owner, |
| 310 | name, |
| 311 | SHT_STRTAB, |
| 312 | flags, |
| 313 | /* link */ nullptr, |
| 314 | /* info */ 0, |
| 315 | align, |
| 316 | /* entsize */ 0), |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 317 | current_offset_(0) { |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 318 | } |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 319 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 320 | Elf_Word Write(const std::string& name) { |
| 321 | if (current_offset_ == 0) { |
| 322 | DCHECK(name.empty()); |
| 323 | } |
| 324 | Elf_Word offset = current_offset_; |
| 325 | this->WriteFully(name.c_str(), name.length() + 1); |
| 326 | current_offset_ += name.length() + 1; |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 327 | return offset; |
| 328 | } |
| 329 | |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 330 | private: |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 331 | Elf_Word current_offset_; |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 332 | }; |
| 333 | |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 334 | // Writer of .dynsym and .symtab sections. |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 335 | class SymbolSection FINAL : public CachedSection { |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 336 | public: |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 337 | SymbolSection(ElfBuilder<ElfTypes>* owner, |
| 338 | const std::string& name, |
| 339 | Elf_Word type, |
| 340 | Elf_Word flags, |
| 341 | Section* strtab) |
| 342 | : CachedSection(owner, |
| 343 | name, |
| 344 | type, |
| 345 | flags, |
| 346 | strtab, |
| 347 | /* info */ 0, |
| 348 | sizeof(Elf_Off), |
| 349 | sizeof(Elf_Sym)) { |
| 350 | // The symbol table always has to start with NULL symbol. |
| 351 | Elf_Sym null_symbol = Elf_Sym(); |
| 352 | CachedSection::Add(&null_symbol, sizeof(null_symbol)); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | // Buffer symbol for this section. It will be written later. |
David Srbecky | 5cc349f | 2015-12-18 15:04:48 +0000 | [diff] [blame] | 356 | // If the symbol's section is null, it will be considered absolute (SHN_ABS). |
| 357 | // (we use this in JIT to reference code which is stored outside the debug ELF file) |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 358 | void Add(Elf_Word name, |
| 359 | const Section* section, |
| 360 | Elf_Addr addr, |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 361 | Elf_Word size, |
| 362 | uint8_t binding, |
David Srbecky | 197160d | 2016-03-07 17:33:57 +0000 | [diff] [blame] | 363 | uint8_t type) { |
| 364 | Elf_Word section_index; |
| 365 | if (section != nullptr) { |
| 366 | DCHECK_LE(section->GetAddress(), addr); |
| 367 | DCHECK_LE(addr, section->GetAddress() + section->GetSize()); |
| 368 | section_index = section->GetSectionIndex(); |
| 369 | } else { |
| 370 | section_index = static_cast<Elf_Word>(SHN_ABS); |
| 371 | } |
| 372 | Add(name, section_index, addr, size, binding, type); |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | void Add(Elf_Word name, |
| 376 | Elf_Word section_index, |
| 377 | Elf_Addr addr, |
| 378 | Elf_Word size, |
| 379 | uint8_t binding, |
David Srbecky | 197160d | 2016-03-07 17:33:57 +0000 | [diff] [blame] | 380 | uint8_t type) { |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 381 | Elf_Sym sym = Elf_Sym(); |
| 382 | sym.st_name = name; |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 383 | sym.st_value = addr; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 384 | sym.st_size = size; |
David Srbecky | 197160d | 2016-03-07 17:33:57 +0000 | [diff] [blame] | 385 | sym.st_other = 0; |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 386 | sym.st_shndx = section_index; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 387 | sym.st_info = (binding << 4) + (type & 0xf); |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 388 | CachedSection::Add(&sym, sizeof(sym)); |
David Srbecky | 0c5bbc1 | 2015-04-28 17:54:52 +0100 | [diff] [blame] | 389 | } |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 390 | }; |
| 391 | |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 392 | class AbiflagsSection FINAL : public Section { |
| 393 | public: |
| 394 | // Section with Mips abiflag info. |
| 395 | static constexpr uint8_t MIPS_AFL_REG_NONE = 0; // no registers |
| 396 | static constexpr uint8_t MIPS_AFL_REG_32 = 1; // 32-bit registers |
| 397 | static constexpr uint8_t MIPS_AFL_REG_64 = 2; // 64-bit registers |
| 398 | static constexpr uint32_t MIPS_AFL_FLAGS1_ODDSPREG = 1; // Uses odd single-prec fp regs |
| 399 | static constexpr uint8_t MIPS_ABI_FP_DOUBLE = 1; // -mdouble-float |
| 400 | static constexpr uint8_t MIPS_ABI_FP_XX = 5; // -mfpxx |
| 401 | static constexpr uint8_t MIPS_ABI_FP_64A = 7; // -mips32r* -mfp64 -mno-odd-spreg |
| 402 | |
| 403 | AbiflagsSection(ElfBuilder<ElfTypes>* owner, |
| 404 | const std::string& name, |
| 405 | Elf_Word type, |
| 406 | Elf_Word flags, |
| 407 | const Section* link, |
| 408 | Elf_Word info, |
| 409 | Elf_Word align, |
| 410 | Elf_Word entsize, |
| 411 | InstructionSet isa, |
| 412 | const InstructionSetFeatures* features) |
| 413 | : Section(owner, name, type, flags, link, info, align, entsize) { |
| 414 | if (isa == kMips || isa == kMips64) { |
| 415 | bool fpu32 = false; // assume mips64 values |
| 416 | uint8_t isa_rev = 6; // assume mips64 values |
| 417 | if (isa == kMips) { |
| 418 | // adjust for mips32 values |
| 419 | fpu32 = features->AsMipsInstructionSetFeatures()->Is32BitFloatingPoint(); |
| 420 | isa_rev = features->AsMipsInstructionSetFeatures()->IsR6() |
| 421 | ? 6 |
| 422 | : features->AsMipsInstructionSetFeatures()->IsMipsIsaRevGreaterThanEqual2() |
| 423 | ? (fpu32 ? 2 : 5) |
| 424 | : 1; |
| 425 | } |
| 426 | abiflags_.version = 0; // version of flags structure |
| 427 | abiflags_.isa_level = (isa == kMips) ? 32 : 64; |
| 428 | abiflags_.isa_rev = isa_rev; |
| 429 | abiflags_.gpr_size = (isa == kMips) ? MIPS_AFL_REG_32 : MIPS_AFL_REG_64; |
| 430 | abiflags_.cpr1_size = fpu32 ? MIPS_AFL_REG_32 : MIPS_AFL_REG_64; |
| 431 | abiflags_.cpr2_size = MIPS_AFL_REG_NONE; |
| 432 | // Set the fp_abi to MIPS_ABI_FP_64A for mips32 with 64-bit FPUs (ie: mips32 R5 and R6). |
| 433 | // Otherwise set to MIPS_ABI_FP_DOUBLE. |
| 434 | abiflags_.fp_abi = (isa == kMips && !fpu32) ? MIPS_ABI_FP_64A : MIPS_ABI_FP_DOUBLE; |
| 435 | abiflags_.isa_ext = 0; |
| 436 | abiflags_.ases = 0; |
| 437 | // To keep the code simple, we are not using odd FP reg for single floats for both |
| 438 | // mips32 and mips64 ART. Therefore we are not setting the MIPS_AFL_FLAGS1_ODDSPREG bit. |
| 439 | abiflags_.flags1 = 0; |
| 440 | abiflags_.flags2 = 0; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | Elf_Word GetSize() const { |
| 445 | return sizeof(abiflags_); |
| 446 | } |
| 447 | |
| 448 | void Write() { |
| 449 | this->WriteFully(&abiflags_, sizeof(abiflags_)); |
| 450 | } |
| 451 | |
| 452 | private: |
| 453 | struct { |
| 454 | uint16_t version; // version of this structure |
| 455 | uint8_t isa_level, isa_rev, gpr_size, cpr1_size, cpr2_size; |
| 456 | uint8_t fp_abi; |
| 457 | uint32_t isa_ext, ases, flags1, flags2; |
| 458 | } abiflags_; |
| 459 | }; |
| 460 | |
David Srbecky | 5d81120 | 2016-03-08 13:21:22 +0000 | [diff] [blame] | 461 | ElfBuilder(InstructionSet isa, const InstructionSetFeatures* features, OutputStream* output) |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 462 | : isa_(isa), |
David Srbecky | 5d81120 | 2016-03-08 13:21:22 +0000 | [diff] [blame] | 463 | features_(features), |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 464 | stream_(output), |
| 465 | rodata_(this, ".rodata", SHT_PROGBITS, SHF_ALLOC, nullptr, 0, kPageSize, 0), |
| 466 | text_(this, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR, nullptr, 0, kPageSize, 0), |
| 467 | bss_(this, ".bss", SHT_NOBITS, SHF_ALLOC, nullptr, 0, kPageSize, 0), |
| 468 | dynstr_(this, ".dynstr", SHF_ALLOC, kPageSize), |
| 469 | dynsym_(this, ".dynsym", SHT_DYNSYM, SHF_ALLOC, &dynstr_), |
| 470 | hash_(this, ".hash", SHT_HASH, SHF_ALLOC, &dynsym_, 0, sizeof(Elf_Word), sizeof(Elf_Word)), |
| 471 | dynamic_(this, ".dynamic", SHT_DYNAMIC, SHF_ALLOC, &dynstr_, 0, kPageSize, sizeof(Elf_Dyn)), |
| 472 | eh_frame_(this, ".eh_frame", SHT_PROGBITS, SHF_ALLOC, nullptr, 0, kPageSize, 0), |
| 473 | eh_frame_hdr_(this, ".eh_frame_hdr", SHT_PROGBITS, SHF_ALLOC, nullptr, 0, 4, 0), |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 474 | strtab_(this, ".strtab", 0, 1), |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 475 | symtab_(this, ".symtab", SHT_SYMTAB, 0, &strtab_), |
| 476 | debug_frame_(this, ".debug_frame", SHT_PROGBITS, 0, nullptr, 0, sizeof(Elf_Addr), 0), |
| 477 | debug_info_(this, ".debug_info", SHT_PROGBITS, 0, nullptr, 0, 1, 0), |
| 478 | debug_line_(this, ".debug_line", SHT_PROGBITS, 0, nullptr, 0, 1, 0), |
| 479 | shstrtab_(this, ".shstrtab", 0, 1), |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 480 | abiflags_(this, ".MIPS.abiflags", SHT_MIPS_ABIFLAGS, SHF_ALLOC, nullptr, 0, kPageSize, 0, |
| 481 | isa, features), |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 482 | started_(false), |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 483 | write_program_headers_(false), |
| 484 | loaded_size_(0u), |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 485 | virtual_address_(0) { |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 486 | text_.phdr_flags_ = PF_R | PF_X; |
| 487 | bss_.phdr_flags_ = PF_R | PF_W; |
| 488 | dynamic_.phdr_flags_ = PF_R | PF_W; |
| 489 | dynamic_.phdr_type_ = PT_DYNAMIC; |
| 490 | eh_frame_hdr_.phdr_type_ = PT_GNU_EH_FRAME; |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 491 | abiflags_.phdr_type_ = PT_MIPS_ABIFLAGS; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 492 | } |
| 493 | ~ElfBuilder() {} |
| 494 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 495 | InstructionSet GetIsa() { return isa_; } |
| 496 | Section* GetRoData() { return &rodata_; } |
| 497 | Section* GetText() { return &text_; } |
| 498 | Section* GetBss() { return &bss_; } |
| 499 | StringSection* GetStrTab() { return &strtab_; } |
| 500 | SymbolSection* GetSymTab() { return &symtab_; } |
| 501 | Section* GetEhFrame() { return &eh_frame_; } |
| 502 | Section* GetEhFrameHdr() { return &eh_frame_hdr_; } |
| 503 | Section* GetDebugFrame() { return &debug_frame_; } |
David Srbecky | b851b49 | 2015-11-11 20:19:38 +0000 | [diff] [blame] | 504 | Section* GetDebugInfo() { return &debug_info_; } |
| 505 | Section* GetDebugLine() { return &debug_line_; } |
Ian Rogers | 0279ebb | 2014-10-08 17:27:48 -0700 | [diff] [blame] | 506 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 507 | // Encode patch locations as LEB128 list of deltas between consecutive addresses. |
| 508 | // (exposed publicly for tests) |
Vladimir Marko | 10c1356 | 2015-11-25 14:33:36 +0000 | [diff] [blame] | 509 | static void EncodeOatPatches(const ArrayRef<const uintptr_t>& locations, |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 510 | std::vector<uint8_t>* buffer) { |
| 511 | buffer->reserve(buffer->size() + locations.size() * 2); // guess 2 bytes per ULEB128. |
| 512 | uintptr_t address = 0; // relative to start of section. |
| 513 | for (uintptr_t location : locations) { |
| 514 | DCHECK_GE(location, address) << "Patch locations are not in sorted order"; |
| 515 | EncodeUnsignedLeb128(buffer, dchecked_integral_cast<uint32_t>(location - address)); |
| 516 | address = location; |
| 517 | } |
| 518 | } |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 519 | |
Vladimir Marko | 10c1356 | 2015-11-25 14:33:36 +0000 | [diff] [blame] | 520 | void WritePatches(const char* name, const ArrayRef<const uintptr_t>& patch_locations) { |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 521 | std::vector<uint8_t> buffer; |
Vladimir Marko | 10c1356 | 2015-11-25 14:33:36 +0000 | [diff] [blame] | 522 | EncodeOatPatches(patch_locations, &buffer); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 523 | std::unique_ptr<Section> s(new Section(this, name, SHT_OAT_PATCH, 0, nullptr, 0, 1, 0)); |
| 524 | s->Start(); |
| 525 | s->WriteFully(buffer.data(), buffer.size()); |
| 526 | s->End(); |
| 527 | other_sections_.push_back(std::move(s)); |
| 528 | } |
David Srbecky | 527c9c7 | 2015-04-17 21:14:10 +0100 | [diff] [blame] | 529 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 530 | void WriteSection(const char* name, const std::vector<uint8_t>* buffer) { |
| 531 | std::unique_ptr<Section> s(new Section(this, name, SHT_PROGBITS, 0, nullptr, 0, 1, 0)); |
| 532 | s->Start(); |
| 533 | s->WriteFully(buffer->data(), buffer->size()); |
| 534 | s->End(); |
| 535 | other_sections_.push_back(std::move(s)); |
| 536 | } |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 537 | |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 538 | // Reserve space for ELF header and program headers. |
| 539 | // We do not know the number of headers until later, so |
| 540 | // it is easiest to just reserve a fixed amount of space. |
| 541 | // Program headers are required for loading by the linker. |
| 542 | // It is possible to omit them for ELF files used for debugging. |
| 543 | void Start(bool write_program_headers = true) { |
| 544 | int size = sizeof(Elf_Ehdr); |
| 545 | if (write_program_headers) { |
| 546 | size += sizeof(Elf_Phdr) * kMaxProgramHeaders; |
| 547 | } |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 548 | stream_.Seek(size, kSeekSet); |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 549 | started_ = true; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 550 | virtual_address_ += size; |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 551 | write_program_headers_ = write_program_headers; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 552 | } |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 553 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 554 | void End() { |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 555 | DCHECK(started_); |
| 556 | |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 557 | // Note: loaded_size_ == 0 for tests that don't write .rodata, .text, .bss, |
| 558 | // .dynstr, dynsym, .hash and .dynamic. These tests should not read loaded_size_. |
| 559 | // TODO: Either refactor the .eh_frame creation so that it counts towards loaded_size_, |
| 560 | // or remove all support for .eh_frame. (The currently unused .eh_frame counts towards |
| 561 | // the virtual_address_ but we don't consider it for loaded_size_.) |
| 562 | CHECK(loaded_size_ == 0 || loaded_size_ == RoundUp(virtual_address_, kPageSize)) |
| 563 | << loaded_size_ << " " << virtual_address_; |
| 564 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 565 | // Write section names and finish the section headers. |
| 566 | shstrtab_.Start(); |
| 567 | shstrtab_.Write(""); |
| 568 | for (auto* section : sections_) { |
| 569 | section->header_.sh_name = shstrtab_.Write(section->name_); |
| 570 | if (section->link_ != nullptr) { |
| 571 | section->header_.sh_link = section->link_->GetSectionIndex(); |
David Srbecky | b0a962c | 2015-04-28 19:43:56 +0100 | [diff] [blame] | 572 | } |
David Srbecky | 527c9c7 | 2015-04-17 21:14:10 +0100 | [diff] [blame] | 573 | } |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 574 | shstrtab_.End(); |
David Srbecky | 527c9c7 | 2015-04-17 21:14:10 +0100 | [diff] [blame] | 575 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 576 | // Write section headers at the end of the ELF file. |
| 577 | std::vector<Elf_Shdr> shdrs; |
| 578 | shdrs.reserve(1u + sections_.size()); |
| 579 | shdrs.push_back(Elf_Shdr()); // NULL at index 0. |
| 580 | for (auto* section : sections_) { |
| 581 | shdrs.push_back(section->header_); |
| 582 | } |
| 583 | Elf_Off section_headers_offset; |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 584 | section_headers_offset = AlignFileOffset(sizeof(Elf_Off)); |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 585 | stream_.WriteFully(shdrs.data(), shdrs.size() * sizeof(shdrs[0])); |
| 586 | |
| 587 | // Flush everything else before writing the program headers. This should prevent |
| 588 | // the OS from reordering writes, so that we don't end up with valid headers |
| 589 | // and partially written data if we suddenly lose power, for example. |
| 590 | stream_.Flush(); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 591 | |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 592 | // The main ELF header. |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 593 | Elf_Ehdr elf_header = MakeElfHeader(isa_, features_); |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 594 | elf_header.e_shoff = section_headers_offset; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 595 | elf_header.e_shnum = shdrs.size(); |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 596 | elf_header.e_shstrndx = shstrtab_.GetSectionIndex(); |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 597 | |
| 598 | // Program headers (i.e. mmap instructions). |
| 599 | std::vector<Elf_Phdr> phdrs; |
| 600 | if (write_program_headers_) { |
| 601 | phdrs = MakeProgramHeaders(); |
| 602 | CHECK_LE(phdrs.size(), kMaxProgramHeaders); |
| 603 | elf_header.e_phoff = sizeof(Elf_Ehdr); |
| 604 | elf_header.e_phnum = phdrs.size(); |
| 605 | } |
| 606 | |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 607 | stream_.Seek(0, kSeekSet); |
| 608 | stream_.WriteFully(&elf_header, sizeof(elf_header)); |
| 609 | stream_.WriteFully(phdrs.data(), phdrs.size() * sizeof(phdrs[0])); |
| 610 | stream_.Flush(); |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 611 | } |
| 612 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 613 | // The running program does not have access to section headers |
| 614 | // and the loader is not supposed to use them either. |
| 615 | // The dynamic sections therefore replicates some of the layout |
| 616 | // information like the address and size of .rodata and .text. |
| 617 | // It also contains other metadata like the SONAME. |
| 618 | // The .dynamic section is found using the PT_DYNAMIC program header. |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 619 | void PrepareDynamicSection(const std::string& elf_file_path, |
| 620 | Elf_Word rodata_size, |
| 621 | Elf_Word text_size, |
| 622 | Elf_Word bss_size) { |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 623 | std::string soname(elf_file_path); |
| 624 | size_t directory_separator_pos = soname.rfind('/'); |
| 625 | if (directory_separator_pos != std::string::npos) { |
| 626 | soname = soname.substr(directory_separator_pos + 1); |
| 627 | } |
| 628 | |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 629 | // Calculate addresses of .text, .bss and .dynstr. |
| 630 | DCHECK_EQ(rodata_.header_.sh_addralign, static_cast<Elf_Word>(kPageSize)); |
| 631 | DCHECK_EQ(text_.header_.sh_addralign, static_cast<Elf_Word>(kPageSize)); |
| 632 | DCHECK_EQ(bss_.header_.sh_addralign, static_cast<Elf_Word>(kPageSize)); |
| 633 | DCHECK_EQ(dynstr_.header_.sh_addralign, static_cast<Elf_Word>(kPageSize)); |
| 634 | Elf_Word rodata_address = rodata_.GetAddress(); |
| 635 | Elf_Word text_address = RoundUp(rodata_address + rodata_size, kPageSize); |
| 636 | Elf_Word bss_address = RoundUp(text_address + text_size, kPageSize); |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 637 | Elf_Word abiflags_address = RoundUp(bss_address + bss_size, kPageSize); |
| 638 | Elf_Word abiflags_size = 0; |
| 639 | if (isa_ == kMips || isa_ == kMips64) { |
| 640 | abiflags_size = abiflags_.GetSize(); |
| 641 | } |
| 642 | Elf_Word dynstr_address = RoundUp(abiflags_address + abiflags_size, kPageSize); |
Vladimir Marko | 45724f9 | 2016-02-17 17:46:10 +0000 | [diff] [blame] | 643 | |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 644 | // Cache .dynstr, .dynsym and .hash data. |
| 645 | dynstr_.Add(""); // dynstr should start with empty string. |
| 646 | Elf_Word rodata_index = rodata_.GetSectionIndex(); |
| 647 | Elf_Word oatdata = dynstr_.Add("oatdata"); |
| 648 | dynsym_.Add(oatdata, rodata_index, rodata_address, rodata_size, STB_GLOBAL, STT_OBJECT); |
| 649 | if (text_size != 0u) { |
| 650 | Elf_Word text_index = rodata_index + 1u; |
| 651 | Elf_Word oatexec = dynstr_.Add("oatexec"); |
| 652 | dynsym_.Add(oatexec, text_index, text_address, text_size, STB_GLOBAL, STT_OBJECT); |
| 653 | Elf_Word oatlastword = dynstr_.Add("oatlastword"); |
| 654 | Elf_Word oatlastword_address = text_address + text_size - 4; |
| 655 | dynsym_.Add(oatlastword, text_index, oatlastword_address, 4, STB_GLOBAL, STT_OBJECT); |
| 656 | } else if (rodata_size != 0) { |
| 657 | // rodata_ can be size 0 for dwarf_test. |
| 658 | Elf_Word oatlastword = dynstr_.Add("oatlastword"); |
| 659 | Elf_Word oatlastword_address = rodata_address + rodata_size - 4; |
| 660 | dynsym_.Add(oatlastword, rodata_index, oatlastword_address, 4, STB_GLOBAL, STT_OBJECT); |
| 661 | } |
| 662 | if (bss_size != 0u) { |
| 663 | Elf_Word bss_index = rodata_index + 1u + (text_size != 0 ? 1u : 0u); |
| 664 | Elf_Word oatbss = dynstr_.Add("oatbss"); |
| 665 | dynsym_.Add(oatbss, bss_index, bss_address, bss_size, STB_GLOBAL, STT_OBJECT); |
| 666 | Elf_Word oatbsslastword = dynstr_.Add("oatbsslastword"); |
| 667 | Elf_Word bsslastword_address = bss_address + bss_size - 4; |
| 668 | dynsym_.Add(oatbsslastword, bss_index, bsslastword_address, 4, STB_GLOBAL, STT_OBJECT); |
| 669 | } |
| 670 | Elf_Word soname_offset = dynstr_.Add(soname); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 671 | |
| 672 | // We do not really need a hash-table since there is so few entries. |
| 673 | // However, the hash-table is the only way the linker can actually |
| 674 | // determine the number of symbols in .dynsym so it is required. |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 675 | int count = dynsym_.GetCacheSize() / sizeof(Elf_Sym); // Includes NULL. |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 676 | std::vector<Elf_Word> hash; |
| 677 | hash.push_back(1); // Number of buckets. |
| 678 | hash.push_back(count); // Number of chains. |
| 679 | // Buckets. Having just one makes it linear search. |
| 680 | hash.push_back(1); // Point to first non-NULL symbol. |
| 681 | // Chains. This creates linked list of symbols. |
| 682 | hash.push_back(0); // Dummy entry for the NULL symbol. |
| 683 | for (int i = 1; i < count - 1; i++) { |
| 684 | hash.push_back(i + 1); // Each symbol points to the next one. |
| 685 | } |
| 686 | hash.push_back(0); // Last symbol terminates the chain. |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 687 | hash_.Add(hash.data(), hash.size() * sizeof(hash[0])); |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 688 | |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 689 | // Calculate addresses of .dynsym, .hash and .dynamic. |
| 690 | DCHECK_EQ(dynstr_.header_.sh_flags, dynsym_.header_.sh_flags); |
| 691 | DCHECK_EQ(dynsym_.header_.sh_flags, hash_.header_.sh_flags); |
| 692 | Elf_Word dynsym_address = |
| 693 | RoundUp(dynstr_address + dynstr_.GetCacheSize(), dynsym_.header_.sh_addralign); |
| 694 | Elf_Word hash_address = |
| 695 | RoundUp(dynsym_address + dynsym_.GetCacheSize(), hash_.header_.sh_addralign); |
| 696 | DCHECK_EQ(dynamic_.header_.sh_addralign, static_cast<Elf_Word>(kPageSize)); |
| 697 | Elf_Word dynamic_address = RoundUp(hash_address + dynsym_.GetCacheSize(), kPageSize); |
| 698 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 699 | Elf_Dyn dyns[] = { |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 700 | { DT_HASH, { hash_address } }, |
| 701 | { DT_STRTAB, { dynstr_address } }, |
| 702 | { DT_SYMTAB, { dynsym_address } }, |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 703 | { DT_SYMENT, { sizeof(Elf_Sym) } }, |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 704 | { DT_STRSZ, { dynstr_.GetCacheSize() } }, |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 705 | { DT_SONAME, { soname_offset } }, |
| 706 | { DT_NULL, { 0 } }, |
| 707 | }; |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 708 | dynamic_.Add(&dyns, sizeof(dyns)); |
| 709 | |
| 710 | loaded_size_ = RoundUp(dynamic_address + dynamic_.GetCacheSize(), kPageSize); |
| 711 | } |
| 712 | |
| 713 | void WriteDynamicSection() { |
| 714 | dynstr_.WriteCachedSection(); |
| 715 | dynsym_.WriteCachedSection(); |
| 716 | hash_.WriteCachedSection(); |
| 717 | dynamic_.WriteCachedSection(); |
| 718 | |
| 719 | CHECK_EQ(loaded_size_, RoundUp(dynamic_.GetAddress() + dynamic_.GetSize(), kPageSize)); |
| 720 | } |
| 721 | |
| 722 | Elf_Word GetLoadedSize() { |
| 723 | CHECK_NE(loaded_size_, 0u); |
| 724 | return loaded_size_; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 725 | } |
| 726 | |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 727 | void WriteMIPSabiflagsSection() { |
| 728 | abiflags_.Start(); |
| 729 | abiflags_.Write(); |
| 730 | abiflags_.End(); |
| 731 | } |
| 732 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 733 | // Returns true if all writes and seeks on the output stream succeeded. |
| 734 | bool Good() { |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 735 | return stream_.Good(); |
| 736 | } |
| 737 | |
| 738 | // Returns the builder's internal stream. |
| 739 | OutputStream* GetStream() { |
| 740 | return &stream_; |
David Srbecky | 527c9c7 | 2015-04-17 21:14:10 +0100 | [diff] [blame] | 741 | } |
| 742 | |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 743 | off_t AlignFileOffset(size_t alignment) { |
| 744 | return stream_.Seek(RoundUp(stream_.Seek(0, kSeekCurrent), alignment), kSeekSet); |
| 745 | } |
| 746 | |
| 747 | Elf_Addr AlignVirtualAddress(size_t alignment) { |
| 748 | return virtual_address_ = RoundUp(virtual_address_, alignment); |
| 749 | } |
| 750 | |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 751 | private: |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 752 | static Elf_Ehdr MakeElfHeader(InstructionSet isa, const InstructionSetFeatures* features) { |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 753 | Elf_Ehdr elf_header = Elf_Ehdr(); |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 754 | switch (isa) { |
| 755 | case kArm: |
| 756 | // Fall through. |
| 757 | case kThumb2: { |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 758 | elf_header.e_machine = EM_ARM; |
| 759 | elf_header.e_flags = EF_ARM_EABI_VER5; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 760 | break; |
| 761 | } |
| 762 | case kArm64: { |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 763 | elf_header.e_machine = EM_AARCH64; |
| 764 | elf_header.e_flags = 0; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 765 | break; |
| 766 | } |
| 767 | case kX86: { |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 768 | elf_header.e_machine = EM_386; |
| 769 | elf_header.e_flags = 0; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 770 | break; |
| 771 | } |
| 772 | case kX86_64: { |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 773 | elf_header.e_machine = EM_X86_64; |
| 774 | elf_header.e_flags = 0; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 775 | break; |
| 776 | } |
| 777 | case kMips: { |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 778 | elf_header.e_machine = EM_MIPS; |
| 779 | elf_header.e_flags = (EF_MIPS_NOREORDER | |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 780 | EF_MIPS_PIC | |
| 781 | EF_MIPS_CPIC | |
| 782 | EF_MIPS_ABI_O32 | |
Greg Kaiser | 81a1899 | 2016-06-16 15:55:15 -0700 | [diff] [blame] | 783 | (features->AsMipsInstructionSetFeatures()->IsR6() |
| 784 | ? EF_MIPS_ARCH_32R6 |
| 785 | : EF_MIPS_ARCH_32R2)); |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 786 | break; |
| 787 | } |
Andreas Gampe | 57b3429 | 2015-01-14 15:45:59 -0800 | [diff] [blame] | 788 | case kMips64: { |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 789 | elf_header.e_machine = EM_MIPS; |
| 790 | elf_header.e_flags = (EF_MIPS_NOREORDER | |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 791 | EF_MIPS_PIC | |
| 792 | EF_MIPS_CPIC | |
| 793 | EF_MIPS_ARCH_64R6); |
Andreas Gampe | 57b3429 | 2015-01-14 15:45:59 -0800 | [diff] [blame] | 794 | break; |
| 795 | } |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 796 | case kNone: { |
| 797 | LOG(FATAL) << "No instruction set"; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 798 | break; |
| 799 | } |
| 800 | default: { |
| 801 | LOG(FATAL) << "Unknown instruction set " << isa; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 802 | } |
| 803 | } |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 804 | |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 805 | elf_header.e_ident[EI_MAG0] = ELFMAG0; |
| 806 | elf_header.e_ident[EI_MAG1] = ELFMAG1; |
| 807 | elf_header.e_ident[EI_MAG2] = ELFMAG2; |
| 808 | elf_header.e_ident[EI_MAG3] = ELFMAG3; |
| 809 | elf_header.e_ident[EI_CLASS] = (sizeof(Elf_Addr) == sizeof(Elf32_Addr)) |
Tong Shen | 62d1ca3 | 2014-09-03 17:24:56 -0700 | [diff] [blame] | 810 | ? ELFCLASS32 : ELFCLASS64;; |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 811 | elf_header.e_ident[EI_DATA] = ELFDATA2LSB; |
| 812 | elf_header.e_ident[EI_VERSION] = EV_CURRENT; |
| 813 | elf_header.e_ident[EI_OSABI] = ELFOSABI_LINUX; |
| 814 | elf_header.e_ident[EI_ABIVERSION] = 0; |
| 815 | elf_header.e_type = ET_DYN; |
| 816 | elf_header.e_version = 1; |
| 817 | elf_header.e_entry = 0; |
| 818 | elf_header.e_ehsize = sizeof(Elf_Ehdr); |
| 819 | elf_header.e_phentsize = sizeof(Elf_Phdr); |
| 820 | elf_header.e_shentsize = sizeof(Elf_Shdr); |
| 821 | elf_header.e_phoff = sizeof(Elf_Ehdr); |
| 822 | return elf_header; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 823 | } |
| 824 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 825 | // Create program headers based on written sections. |
| 826 | std::vector<Elf_Phdr> MakeProgramHeaders() { |
| 827 | CHECK(!sections_.empty()); |
| 828 | std::vector<Elf_Phdr> phdrs; |
| 829 | { |
| 830 | // The program headers must start with PT_PHDR which is used in |
| 831 | // loaded process to determine the number of program headers. |
| 832 | Elf_Phdr phdr = Elf_Phdr(); |
| 833 | phdr.p_type = PT_PHDR; |
| 834 | phdr.p_flags = PF_R; |
| 835 | phdr.p_offset = phdr.p_vaddr = phdr.p_paddr = sizeof(Elf_Ehdr); |
| 836 | phdr.p_filesz = phdr.p_memsz = 0; // We need to fill this later. |
| 837 | phdr.p_align = sizeof(Elf_Off); |
| 838 | phdrs.push_back(phdr); |
| 839 | // Tell the linker to mmap the start of file to memory. |
| 840 | Elf_Phdr load = Elf_Phdr(); |
| 841 | load.p_type = PT_LOAD; |
| 842 | load.p_flags = PF_R; |
| 843 | load.p_offset = load.p_vaddr = load.p_paddr = 0; |
David Srbecky | 2fdd03c | 2016-03-10 15:32:37 +0000 | [diff] [blame] | 844 | load.p_filesz = load.p_memsz = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * kMaxProgramHeaders; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 845 | load.p_align = kPageSize; |
| 846 | phdrs.push_back(load); |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 847 | } |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 848 | // Create program headers for sections. |
| 849 | for (auto* section : sections_) { |
| 850 | const Elf_Shdr& shdr = section->header_; |
| 851 | if ((shdr.sh_flags & SHF_ALLOC) != 0 && shdr.sh_size != 0) { |
| 852 | // PT_LOAD tells the linker to mmap part of the file. |
| 853 | // The linker can only mmap page-aligned sections. |
| 854 | // Single PT_LOAD may contain several ELF sections. |
| 855 | Elf_Phdr& prev = phdrs.back(); |
| 856 | Elf_Phdr load = Elf_Phdr(); |
| 857 | load.p_type = PT_LOAD; |
| 858 | load.p_flags = section->phdr_flags_; |
| 859 | load.p_offset = shdr.sh_offset; |
| 860 | load.p_vaddr = load.p_paddr = shdr.sh_addr; |
| 861 | load.p_filesz = (shdr.sh_type != SHT_NOBITS ? shdr.sh_size : 0u); |
| 862 | load.p_memsz = shdr.sh_size; |
| 863 | load.p_align = shdr.sh_addralign; |
| 864 | if (prev.p_type == load.p_type && |
| 865 | prev.p_flags == load.p_flags && |
| 866 | prev.p_filesz == prev.p_memsz && // Do not merge .bss |
| 867 | load.p_filesz == load.p_memsz) { // Do not merge .bss |
| 868 | // Merge this PT_LOAD with the previous one. |
| 869 | Elf_Word size = shdr.sh_offset + shdr.sh_size - prev.p_offset; |
| 870 | prev.p_filesz = size; |
| 871 | prev.p_memsz = size; |
| 872 | } else { |
| 873 | // If we are adding new load, it must be aligned. |
| 874 | CHECK_EQ(shdr.sh_addralign, (Elf_Word)kPageSize); |
| 875 | phdrs.push_back(load); |
| 876 | } |
| 877 | } |
| 878 | } |
| 879 | for (auto* section : sections_) { |
| 880 | const Elf_Shdr& shdr = section->header_; |
| 881 | if ((shdr.sh_flags & SHF_ALLOC) != 0 && shdr.sh_size != 0) { |
| 882 | // Other PT_* types allow the program to locate interesting |
| 883 | // parts of memory at runtime. They must overlap with PT_LOAD. |
| 884 | if (section->phdr_type_ != 0) { |
| 885 | Elf_Phdr phdr = Elf_Phdr(); |
| 886 | phdr.p_type = section->phdr_type_; |
| 887 | phdr.p_flags = section->phdr_flags_; |
| 888 | phdr.p_offset = shdr.sh_offset; |
| 889 | phdr.p_vaddr = phdr.p_paddr = shdr.sh_addr; |
| 890 | phdr.p_filesz = phdr.p_memsz = shdr.sh_size; |
| 891 | phdr.p_align = shdr.sh_addralign; |
| 892 | phdrs.push_back(phdr); |
| 893 | } |
| 894 | } |
| 895 | } |
| 896 | // Set the size of the initial PT_PHDR. |
| 897 | CHECK_EQ(phdrs[0].p_type, (Elf_Word)PT_PHDR); |
| 898 | phdrs[0].p_filesz = phdrs[0].p_memsz = phdrs.size() * sizeof(Elf_Phdr); |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 899 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 900 | return phdrs; |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 901 | } |
| 902 | |
David Srbecky | bc90fd0 | 2015-04-22 19:40:27 +0100 | [diff] [blame] | 903 | InstructionSet isa_; |
David Srbecky | 5d81120 | 2016-03-08 13:21:22 +0000 | [diff] [blame] | 904 | const InstructionSetFeatures* features_; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 905 | |
Vladimir Marko | 131980f | 2015-12-03 18:29:23 +0000 | [diff] [blame] | 906 | ErrorDelayingOutputStream stream_; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 907 | |
| 908 | Section rodata_; |
| 909 | Section text_; |
| 910 | Section bss_; |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 911 | CachedStringSection dynstr_; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 912 | SymbolSection dynsym_; |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 913 | CachedSection hash_; |
| 914 | CachedSection dynamic_; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 915 | Section eh_frame_; |
| 916 | Section eh_frame_hdr_; |
| 917 | StringSection strtab_; |
| 918 | SymbolSection symtab_; |
| 919 | Section debug_frame_; |
David Srbecky | b851b49 | 2015-11-11 20:19:38 +0000 | [diff] [blame] | 920 | Section debug_info_; |
| 921 | Section debug_line_; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 922 | StringSection shstrtab_; |
Douglas Leung | 316a218 | 2015-09-17 15:26:25 -0700 | [diff] [blame] | 923 | AbiflagsSection abiflags_; |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 924 | std::vector<std::unique_ptr<Section>> other_sections_; |
| 925 | |
| 926 | // List of used section in the order in which they were written. |
| 927 | std::vector<Section*> sections_; |
| 928 | |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 929 | bool started_; |
Vladimir Marko | 944da60 | 2016-02-19 12:27:55 +0000 | [diff] [blame] | 930 | bool write_program_headers_; |
| 931 | |
| 932 | // The size of the memory taken by the ELF file when loaded. |
| 933 | size_t loaded_size_; |
David Srbecky | 579942f | 2016-01-28 20:01:28 +0000 | [diff] [blame] | 934 | |
David Srbecky | 6d8c8f0 | 2015-10-26 10:57:09 +0000 | [diff] [blame] | 935 | // Used for allocation of virtual address space. |
| 936 | Elf_Addr virtual_address_; |
Ian Rogers | 0279ebb | 2014-10-08 17:27:48 -0700 | [diff] [blame] | 937 | |
| 938 | DISALLOW_COPY_AND_ASSIGN(ElfBuilder); |
Andreas Gampe | 54fc26c | 2014-09-04 21:47:42 -0700 | [diff] [blame] | 939 | }; |
| 940 | |
| 941 | } // namespace art |
| 942 | |
| 943 | #endif // ART_COMPILER_ELF_BUILDER_H_ |