Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 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 | #include "elf_writer_quick.h" |
| 18 | |
| 19 | #include "base/logging.h" |
| 20 | #include "base/unix_file/fd_file.h" |
Brian Carlstrom | c6dfdac | 2013-08-26 18:57:31 -0700 | [diff] [blame] | 21 | #include "buffered_output_stream.h" |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 22 | #include "driver/compiler_driver.h" |
Alex Light | 3470ab4 | 2014-06-18 10:35:45 -0700 | [diff] [blame] | 23 | #include "dwarf.h" |
Nicolas Geoffray | 50cfe74 | 2014-02-19 13:27:42 +0000 | [diff] [blame] | 24 | #include "elf_utils.h" |
Brian Carlstrom | c50d8e1 | 2013-07-23 22:35:16 -0700 | [diff] [blame] | 25 | #include "file_output_stream.h" |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 26 | #include "globals.h" |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 27 | #include "leb128.h" |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 28 | #include "oat.h" |
Brian Carlstrom | c50d8e1 | 2013-07-23 22:35:16 -0700 | [diff] [blame] | 29 | #include "oat_writer.h" |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 30 | #include "utils.h" |
| 31 | |
| 32 | namespace art { |
| 33 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 34 | static constexpr Elf32_Word NextOffset(const Elf32_Shdr& cur, const Elf32_Shdr& prev) { |
| 35 | return RoundUp(prev.sh_size + prev.sh_offset, cur.sh_addralign); |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 36 | } |
| 37 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 38 | static uint8_t MakeStInfo(uint8_t binding, uint8_t type) { |
| 39 | return ((binding) << 4) + ((type) & 0xf); |
| 40 | } |
| 41 | |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 42 | static void UpdateWord(std::vector<uint8_t>* buf, int offset, int data) { |
| 43 | (*buf)[offset+0] = data; |
| 44 | (*buf)[offset+1] = data >> 8; |
| 45 | (*buf)[offset+2] = data >> 16; |
| 46 | (*buf)[offset+3] = data >> 24; |
| 47 | } |
| 48 | |
| 49 | static void PushWord(std::vector<uint8_t>* buf, int data) { |
| 50 | buf->push_back(data & 0xff); |
| 51 | buf->push_back((data >> 8) & 0xff); |
| 52 | buf->push_back((data >> 16) & 0xff); |
| 53 | buf->push_back((data >> 24) & 0xff); |
| 54 | } |
| 55 | |
| 56 | static void PushHalf(std::vector<uint8_t>* buf, int data) { |
| 57 | buf->push_back(data & 0xff); |
| 58 | buf->push_back((data >> 8) & 0xff); |
| 59 | } |
| 60 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 61 | bool ElfWriterQuick::ElfBuilder::Write() { |
| 62 | // The basic layout of the elf file. Order may be different in final output. |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 63 | // +-------------------------+ |
| 64 | // | Elf32_Ehdr | |
| 65 | // +-------------------------+ |
| 66 | // | Elf32_Phdr PHDR | |
| 67 | // | Elf32_Phdr LOAD R | .dynsym .dynstr .hash .rodata |
| 68 | // | Elf32_Phdr LOAD R X | .text |
| 69 | // | Elf32_Phdr LOAD RW | .dynamic |
| 70 | // | Elf32_Phdr DYNAMIC | .dynamic |
| 71 | // +-------------------------+ |
| 72 | // | .dynsym | |
| 73 | // | Elf32_Sym STN_UNDEF | |
| 74 | // | Elf32_Sym oatdata | |
| 75 | // | Elf32_Sym oatexec | |
| 76 | // | Elf32_Sym oatlastword | |
| 77 | // +-------------------------+ |
| 78 | // | .dynstr | |
| 79 | // | \0 | |
| 80 | // | oatdata\0 | |
| 81 | // | oatexec\0 | |
| 82 | // | oatlastword\0 | |
| 83 | // | boot.oat\0 | |
| 84 | // +-------------------------+ |
| 85 | // | .hash | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 86 | // | Elf32_Word nbucket = b | |
| 87 | // | Elf32_Word nchain = c | |
| 88 | // | Elf32_Word bucket[0] | |
| 89 | // | ... | |
| 90 | // | Elf32_Word bucket[b - 1]| |
| 91 | // | Elf32_Word chain[0] | |
| 92 | // | ... | |
| 93 | // | Elf32_Word chain[c - 1] | |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 94 | // +-------------------------+ |
| 95 | // | .rodata | |
| 96 | // | oatdata..oatexec-4 | |
| 97 | // +-------------------------+ |
| 98 | // | .text | |
| 99 | // | oatexec..oatlastword | |
| 100 | // +-------------------------+ |
| 101 | // | .dynamic | |
| 102 | // | Elf32_Dyn DT_SONAME | |
| 103 | // | Elf32_Dyn DT_HASH | |
| 104 | // | Elf32_Dyn DT_SYMTAB | |
| 105 | // | Elf32_Dyn DT_SYMENT | |
| 106 | // | Elf32_Dyn DT_STRTAB | |
| 107 | // | Elf32_Dyn DT_STRSZ | |
| 108 | // | Elf32_Dyn DT_NULL | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 109 | // +-------------------------+ (Optional) |
| 110 | // | .strtab | (Optional) |
| 111 | // | program symbol names | (Optional) |
| 112 | // +-------------------------+ (Optional) |
| 113 | // | .symtab | (Optional) |
| 114 | // | program symbols | (Optional) |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 115 | // +-------------------------+ |
| 116 | // | .shstrtab | |
| 117 | // | \0 | |
| 118 | // | .dynamic\0 | |
| 119 | // | .dynsym\0 | |
| 120 | // | .dynstr\0 | |
| 121 | // | .hash\0 | |
| 122 | // | .rodata\0 | |
| 123 | // | .text\0 | |
| 124 | // | .shstrtab\0 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 125 | // | .symtab\0 | (Optional) |
| 126 | // | .strtab\0 | (Optional) |
| 127 | // | .debug_str\0 | (Optional) |
| 128 | // | .debug_info\0 | (Optional) |
Tong Shen | 35e1e6a | 2014-07-30 09:31:22 -0700 | [diff] [blame] | 129 | // | .eh_frame\0 | (Optional) |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 130 | // | .debug_abbrev\0 | (Optional) |
| 131 | // +-------------------------+ (Optional) |
| 132 | // | .debug_str | (Optional) |
| 133 | // +-------------------------+ (Optional) |
| 134 | // | .debug_info | (Optional) |
| 135 | // +-------------------------+ (Optional) |
Tong Shen | 35e1e6a | 2014-07-30 09:31:22 -0700 | [diff] [blame] | 136 | // | .eh_frame | (Optional) |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 137 | // +-------------------------+ (Optional) |
| 138 | // | .debug_abbrev | (Optional) |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 139 | // +-------------------------+ |
| 140 | // | Elf32_Shdr NULL | |
| 141 | // | Elf32_Shdr .dynsym | |
| 142 | // | Elf32_Shdr .dynstr | |
| 143 | // | Elf32_Shdr .hash | |
| 144 | // | Elf32_Shdr .text | |
| 145 | // | Elf32_Shdr .rodata | |
| 146 | // | Elf32_Shdr .dynamic | |
| 147 | // | Elf32_Shdr .shstrtab | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 148 | // | Elf32_Shdr .debug_str | (Optional) |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 149 | // | Elf32_Shdr .debug_info | (Optional) |
Tong Shen | 35e1e6a | 2014-07-30 09:31:22 -0700 | [diff] [blame] | 150 | // | Elf32_Shdr .eh_frame | (Optional) |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 151 | // | Elf32_Shdr .debug_abbrev| (Optional) |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 152 | // +-------------------------+ |
| 153 | |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 154 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 155 | if (fatal_error_) { |
| 156 | return false; |
| 157 | } |
| 158 | // Step 1. Figure out all the offsets. |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 159 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 160 | // What phdr is. |
| 161 | uint32_t phdr_offset = sizeof(Elf32_Ehdr); |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 162 | const uint8_t PH_PHDR = 0; |
| 163 | const uint8_t PH_LOAD_R__ = 1; |
| 164 | const uint8_t PH_LOAD_R_X = 2; |
| 165 | const uint8_t PH_LOAD_RW_ = 3; |
| 166 | const uint8_t PH_DYNAMIC = 4; |
| 167 | const uint8_t PH_NUM = 5; |
Nicolas Geoffray | 50cfe74 | 2014-02-19 13:27:42 +0000 | [diff] [blame] | 168 | uint32_t phdr_size = sizeof(Elf32_Phdr) * PH_NUM; |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 169 | if (debug_logging_) { |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 170 | LOG(INFO) << "phdr_offset=" << phdr_offset << std::hex << " " << phdr_offset; |
| 171 | LOG(INFO) << "phdr_size=" << phdr_size << std::hex << " " << phdr_size; |
| 172 | } |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 173 | Elf32_Phdr program_headers[PH_NUM]; |
| 174 | memset(&program_headers, 0, sizeof(program_headers)); |
| 175 | program_headers[PH_PHDR].p_type = PT_PHDR; |
| 176 | program_headers[PH_PHDR].p_offset = phdr_offset; |
| 177 | program_headers[PH_PHDR].p_vaddr = phdr_offset; |
| 178 | program_headers[PH_PHDR].p_paddr = phdr_offset; |
| 179 | program_headers[PH_PHDR].p_filesz = sizeof(program_headers); |
| 180 | program_headers[PH_PHDR].p_memsz = sizeof(program_headers); |
| 181 | program_headers[PH_PHDR].p_flags = PF_R; |
| 182 | program_headers[PH_PHDR].p_align = sizeof(Elf32_Word); |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 183 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 184 | program_headers[PH_LOAD_R__].p_type = PT_LOAD; |
| 185 | program_headers[PH_LOAD_R__].p_offset = 0; |
| 186 | program_headers[PH_LOAD_R__].p_vaddr = 0; |
| 187 | program_headers[PH_LOAD_R__].p_paddr = 0; |
| 188 | program_headers[PH_LOAD_R__].p_flags = PF_R; |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 189 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 190 | program_headers[PH_LOAD_R_X].p_type = PT_LOAD; |
| 191 | program_headers[PH_LOAD_R_X].p_flags = PF_R | PF_X; |
| 192 | |
| 193 | program_headers[PH_LOAD_RW_].p_type = PT_LOAD; |
| 194 | program_headers[PH_LOAD_RW_].p_flags = PF_R | PF_W; |
| 195 | |
| 196 | program_headers[PH_DYNAMIC].p_type = PT_DYNAMIC; |
| 197 | program_headers[PH_DYNAMIC].p_flags = PF_R | PF_W; |
| 198 | |
| 199 | // Get the dynstr string. |
| 200 | std::string dynstr(dynsym_builder_.GenerateStrtab()); |
| 201 | |
| 202 | // Add the SONAME to the dynstr. |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 203 | uint32_t dynstr_soname_offset = dynstr.size(); |
| 204 | std::string file_name(elf_file_->GetPath()); |
| 205 | size_t directory_separator_pos = file_name.rfind('/'); |
| 206 | if (directory_separator_pos != std::string::npos) { |
| 207 | file_name = file_name.substr(directory_separator_pos + 1); |
| 208 | } |
| 209 | dynstr += file_name; |
| 210 | dynstr += '\0'; |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 211 | if (debug_logging_) { |
| 212 | LOG(INFO) << "dynstr size (bytes) =" << dynstr.size() |
| 213 | << std::hex << " " << dynstr.size(); |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 214 | LOG(INFO) << "dynsym size (elements)=" << dynsym_builder_.GetSize() |
| 215 | << std::hex << " " << dynsym_builder_.GetSize(); |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 216 | } |
| 217 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 218 | // get the strtab |
| 219 | std::string strtab; |
| 220 | if (IncludingDebugSymbols()) { |
| 221 | strtab = symtab_builder_.GenerateStrtab(); |
| 222 | if (debug_logging_) { |
| 223 | LOG(INFO) << "strtab size (bytes) =" << strtab.size() |
| 224 | << std::hex << " " << strtab.size(); |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 225 | LOG(INFO) << "symtab size (elements) =" << symtab_builder_.GetSize() |
| 226 | << std::hex << " " << symtab_builder_.GetSize(); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 227 | } |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 228 | } |
| 229 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 230 | // Get the section header string table. |
| 231 | std::vector<Elf32_Shdr*> section_ptrs; |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 232 | std::string shstrtab; |
| 233 | shstrtab += '\0'; |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 234 | |
| 235 | // Setup sym_undef |
| 236 | Elf32_Shdr null_hdr; |
| 237 | memset(&null_hdr, 0, sizeof(null_hdr)); |
| 238 | null_hdr.sh_type = SHT_NULL; |
| 239 | null_hdr.sh_link = SHN_UNDEF; |
| 240 | section_ptrs.push_back(&null_hdr); |
| 241 | |
| 242 | uint32_t section_index = 1; |
| 243 | |
| 244 | // setup .dynsym |
| 245 | section_ptrs.push_back(&dynsym_builder_.section_); |
| 246 | AssignSectionStr(&dynsym_builder_, &shstrtab); |
| 247 | dynsym_builder_.section_index_ = section_index++; |
| 248 | |
| 249 | // Setup .dynstr |
| 250 | section_ptrs.push_back(&dynsym_builder_.strtab_.section_); |
| 251 | AssignSectionStr(&dynsym_builder_.strtab_, &shstrtab); |
| 252 | dynsym_builder_.strtab_.section_index_ = section_index++; |
| 253 | |
| 254 | // Setup .hash |
| 255 | section_ptrs.push_back(&hash_builder_.section_); |
| 256 | AssignSectionStr(&hash_builder_, &shstrtab); |
| 257 | hash_builder_.section_index_ = section_index++; |
| 258 | |
| 259 | // Setup .rodata |
| 260 | section_ptrs.push_back(&rodata_builder_.section_); |
| 261 | AssignSectionStr(&rodata_builder_, &shstrtab); |
| 262 | rodata_builder_.section_index_ = section_index++; |
| 263 | |
| 264 | // Setup .text |
| 265 | section_ptrs.push_back(&text_builder_.section_); |
| 266 | AssignSectionStr(&text_builder_, &shstrtab); |
| 267 | text_builder_.section_index_ = section_index++; |
| 268 | |
| 269 | // Setup .dynamic |
| 270 | section_ptrs.push_back(&dynamic_builder_.section_); |
| 271 | AssignSectionStr(&dynamic_builder_, &shstrtab); |
| 272 | dynamic_builder_.section_index_ = section_index++; |
| 273 | |
| 274 | if (IncludingDebugSymbols()) { |
| 275 | // Setup .symtab |
| 276 | section_ptrs.push_back(&symtab_builder_.section_); |
| 277 | AssignSectionStr(&symtab_builder_, &shstrtab); |
| 278 | symtab_builder_.section_index_ = section_index++; |
| 279 | |
| 280 | // Setup .strtab |
| 281 | section_ptrs.push_back(&symtab_builder_.strtab_.section_); |
| 282 | AssignSectionStr(&symtab_builder_.strtab_, &shstrtab); |
| 283 | symtab_builder_.strtab_.section_index_ = section_index++; |
| 284 | } |
| 285 | ElfRawSectionBuilder* it = other_builders_.data(); |
| 286 | for (uint32_t cnt = 0; cnt < other_builders_.size(); ++it, ++cnt) { |
| 287 | // Setup all the other sections. |
| 288 | section_ptrs.push_back(&it->section_); |
| 289 | AssignSectionStr(it, &shstrtab); |
| 290 | it->section_index_ = section_index++; |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 291 | } |
| 292 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 293 | // Setup shstrtab |
| 294 | section_ptrs.push_back(&shstrtab_builder_.section_); |
| 295 | AssignSectionStr(&shstrtab_builder_, &shstrtab); |
| 296 | shstrtab_builder_.section_index_ = section_index++; |
| 297 | |
| 298 | if (debug_logging_) { |
| 299 | LOG(INFO) << ".shstrtab size (bytes) =" << shstrtab.size() |
| 300 | << std::hex << " " << shstrtab.size(); |
| 301 | LOG(INFO) << "section list size (elements)=" << section_ptrs.size() |
| 302 | << std::hex << " " << section_ptrs.size(); |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 303 | } |
| 304 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 305 | // Fill in the hash section. |
| 306 | std::vector<Elf32_Word> hash = dynsym_builder_.GenerateHashContents(); |
| 307 | |
| 308 | if (debug_logging_) { |
| 309 | LOG(INFO) << ".hash size (bytes)=" << hash.size() * sizeof(Elf32_Word) |
| 310 | << std::hex << " " << hash.size() * sizeof(Elf32_Word); |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 311 | } |
| 312 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 313 | Elf32_Word base_offset = sizeof(Elf32_Ehdr) + sizeof(program_headers); |
| 314 | std::vector<ElfFilePiece> pieces; |
| 315 | |
| 316 | // Get the layout in the sections. |
| 317 | // |
| 318 | // Get the layout of the dynsym section. |
| 319 | dynsym_builder_.section_.sh_offset = RoundUp(base_offset, dynsym_builder_.section_.sh_addralign); |
| 320 | dynsym_builder_.section_.sh_addr = dynsym_builder_.section_.sh_offset; |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 321 | dynsym_builder_.section_.sh_size = dynsym_builder_.GetSize() * sizeof(Elf32_Sym); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 322 | dynsym_builder_.section_.sh_link = dynsym_builder_.GetLink(); |
| 323 | |
| 324 | // Get the layout of the dynstr section. |
| 325 | dynsym_builder_.strtab_.section_.sh_offset = NextOffset(dynsym_builder_.strtab_.section_, |
| 326 | dynsym_builder_.section_); |
| 327 | dynsym_builder_.strtab_.section_.sh_addr = dynsym_builder_.strtab_.section_.sh_offset; |
| 328 | dynsym_builder_.strtab_.section_.sh_size = dynstr.size(); |
| 329 | dynsym_builder_.strtab_.section_.sh_link = dynsym_builder_.strtab_.GetLink(); |
| 330 | |
| 331 | // Get the layout of the hash section |
| 332 | hash_builder_.section_.sh_offset = NextOffset(hash_builder_.section_, |
| 333 | dynsym_builder_.strtab_.section_); |
| 334 | hash_builder_.section_.sh_addr = hash_builder_.section_.sh_offset; |
| 335 | hash_builder_.section_.sh_size = hash.size() * sizeof(Elf32_Word); |
| 336 | hash_builder_.section_.sh_link = hash_builder_.GetLink(); |
| 337 | |
| 338 | // Get the layout of the rodata section. |
| 339 | rodata_builder_.section_.sh_offset = NextOffset(rodata_builder_.section_, |
| 340 | hash_builder_.section_); |
| 341 | rodata_builder_.section_.sh_addr = rodata_builder_.section_.sh_offset; |
| 342 | rodata_builder_.section_.sh_size = rodata_builder_.size_; |
| 343 | rodata_builder_.section_.sh_link = rodata_builder_.GetLink(); |
| 344 | |
| 345 | // Get the layout of the text section. |
| 346 | text_builder_.section_.sh_offset = NextOffset(text_builder_.section_, rodata_builder_.section_); |
| 347 | text_builder_.section_.sh_addr = text_builder_.section_.sh_offset; |
| 348 | text_builder_.section_.sh_size = text_builder_.size_; |
| 349 | text_builder_.section_.sh_link = text_builder_.GetLink(); |
| 350 | CHECK_ALIGNED(rodata_builder_.section_.sh_offset + rodata_builder_.section_.sh_size, kPageSize); |
| 351 | |
| 352 | // Get the layout of the dynamic section. |
| 353 | dynamic_builder_.section_.sh_offset = NextOffset(dynamic_builder_.section_, |
| 354 | text_builder_.section_); |
| 355 | dynamic_builder_.section_.sh_addr = dynamic_builder_.section_.sh_offset; |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 356 | dynamic_builder_.section_.sh_size = dynamic_builder_.GetSize() * sizeof(Elf32_Dyn); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 357 | dynamic_builder_.section_.sh_link = dynamic_builder_.GetLink(); |
| 358 | |
| 359 | Elf32_Shdr prev = dynamic_builder_.section_; |
| 360 | if (IncludingDebugSymbols()) { |
| 361 | // Get the layout of the symtab section. |
| 362 | symtab_builder_.section_.sh_offset = NextOffset(symtab_builder_.section_, |
| 363 | dynamic_builder_.section_); |
| 364 | symtab_builder_.section_.sh_addr = 0; |
| 365 | // Add to leave space for the null symbol. |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 366 | symtab_builder_.section_.sh_size = symtab_builder_.GetSize() * sizeof(Elf32_Sym); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 367 | symtab_builder_.section_.sh_link = symtab_builder_.GetLink(); |
| 368 | |
| 369 | // Get the layout of the dynstr section. |
| 370 | symtab_builder_.strtab_.section_.sh_offset = NextOffset(symtab_builder_.strtab_.section_, |
| 371 | symtab_builder_.section_); |
| 372 | symtab_builder_.strtab_.section_.sh_addr = 0; |
| 373 | symtab_builder_.strtab_.section_.sh_size = strtab.size(); |
| 374 | symtab_builder_.strtab_.section_.sh_link = symtab_builder_.strtab_.GetLink(); |
| 375 | |
| 376 | prev = symtab_builder_.strtab_.section_; |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 377 | } |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 378 | if (debug_logging_) { |
| 379 | LOG(INFO) << "dynsym off=" << dynsym_builder_.section_.sh_offset |
| 380 | << " dynsym size=" << dynsym_builder_.section_.sh_size; |
| 381 | LOG(INFO) << "dynstr off=" << dynsym_builder_.strtab_.section_.sh_offset |
| 382 | << " dynstr size=" << dynsym_builder_.strtab_.section_.sh_size; |
| 383 | LOG(INFO) << "hash off=" << hash_builder_.section_.sh_offset |
| 384 | << " hash size=" << hash_builder_.section_.sh_size; |
| 385 | LOG(INFO) << "rodata off=" << rodata_builder_.section_.sh_offset |
| 386 | << " rodata size=" << rodata_builder_.section_.sh_size; |
| 387 | LOG(INFO) << "text off=" << text_builder_.section_.sh_offset |
| 388 | << " text size=" << text_builder_.section_.sh_size; |
| 389 | LOG(INFO) << "dynamic off=" << dynamic_builder_.section_.sh_offset |
| 390 | << " dynamic size=" << dynamic_builder_.section_.sh_size; |
| 391 | if (IncludingDebugSymbols()) { |
| 392 | LOG(INFO) << "symtab off=" << symtab_builder_.section_.sh_offset |
| 393 | << " symtab size=" << symtab_builder_.section_.sh_size; |
| 394 | LOG(INFO) << "strtab off=" << symtab_builder_.strtab_.section_.sh_offset |
| 395 | << " strtab size=" << symtab_builder_.strtab_.section_.sh_size; |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 396 | } |
| 397 | } |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 398 | // Get the layout of the extra sections. (This will deal with the debug |
| 399 | // sections if they are there) |
| 400 | for (auto it = other_builders_.begin(); it != other_builders_.end(); ++it) { |
| 401 | it->section_.sh_offset = NextOffset(it->section_, prev); |
| 402 | it->section_.sh_addr = 0; |
| 403 | it->section_.sh_size = it->GetBuffer()->size(); |
| 404 | it->section_.sh_link = it->GetLink(); |
| 405 | pieces.push_back(ElfFilePiece(it->name_, it->section_.sh_offset, |
| 406 | it->GetBuffer()->data(), it->GetBuffer()->size())); |
| 407 | prev = it->section_; |
| 408 | if (debug_logging_) { |
| 409 | LOG(INFO) << it->name_ << " off=" << it->section_.sh_offset |
| 410 | << " " << it->name_ << " size=" << it->section_.sh_size; |
| 411 | } |
| 412 | } |
| 413 | // Get the layout of the shstrtab section |
| 414 | shstrtab_builder_.section_.sh_offset = NextOffset(shstrtab_builder_.section_, prev); |
| 415 | shstrtab_builder_.section_.sh_addr = 0; |
| 416 | shstrtab_builder_.section_.sh_size = shstrtab.size(); |
| 417 | shstrtab_builder_.section_.sh_link = shstrtab_builder_.GetLink(); |
| 418 | if (debug_logging_) { |
| 419 | LOG(INFO) << "shstrtab off=" << shstrtab_builder_.section_.sh_offset |
| 420 | << " shstrtab size=" << shstrtab_builder_.section_.sh_size; |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 421 | } |
| 422 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 423 | // The section list comes after come after. |
| 424 | Elf32_Word sections_offset = RoundUp( |
| 425 | shstrtab_builder_.section_.sh_offset + shstrtab_builder_.section_.sh_size, |
| 426 | sizeof(Elf32_Word)); |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 427 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 428 | // Setup the actual symbol arrays. |
| 429 | std::vector<Elf32_Sym> dynsym = dynsym_builder_.GenerateSymtab(); |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 430 | CHECK_EQ(dynsym.size() * sizeof(Elf32_Sym), dynsym_builder_.section_.sh_size); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 431 | std::vector<Elf32_Sym> symtab; |
| 432 | if (IncludingDebugSymbols()) { |
| 433 | symtab = symtab_builder_.GenerateSymtab(); |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 434 | CHECK_EQ(symtab.size() * sizeof(Elf32_Sym), symtab_builder_.section_.sh_size); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | // Setup the dynamic section. |
| 438 | // This will add the 2 values we cannot know until now time, namely the size |
| 439 | // and the soname_offset. |
| 440 | std::vector<Elf32_Dyn> dynamic = dynamic_builder_.GetDynamics(dynstr.size(), |
| 441 | dynstr_soname_offset); |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 442 | CHECK_EQ(dynamic.size() * sizeof(Elf32_Dyn), dynamic_builder_.section_.sh_size); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 443 | |
| 444 | // Finish setup of the program headers now that we know the layout of the |
| 445 | // whole file. |
| 446 | Elf32_Word load_r_size = rodata_builder_.section_.sh_offset + rodata_builder_.section_.sh_size; |
| 447 | program_headers[PH_LOAD_R__].p_filesz = load_r_size; |
| 448 | program_headers[PH_LOAD_R__].p_memsz = load_r_size; |
| 449 | program_headers[PH_LOAD_R__].p_align = rodata_builder_.section_.sh_addralign; |
| 450 | |
| 451 | Elf32_Word load_rx_size = text_builder_.section_.sh_size; |
| 452 | program_headers[PH_LOAD_R_X].p_offset = text_builder_.section_.sh_offset; |
| 453 | program_headers[PH_LOAD_R_X].p_vaddr = text_builder_.section_.sh_offset; |
| 454 | program_headers[PH_LOAD_R_X].p_paddr = text_builder_.section_.sh_offset; |
| 455 | program_headers[PH_LOAD_R_X].p_filesz = load_rx_size; |
| 456 | program_headers[PH_LOAD_R_X].p_memsz = load_rx_size; |
| 457 | program_headers[PH_LOAD_R_X].p_align = text_builder_.section_.sh_addralign; |
| 458 | |
| 459 | program_headers[PH_LOAD_RW_].p_offset = dynamic_builder_.section_.sh_offset; |
| 460 | program_headers[PH_LOAD_RW_].p_vaddr = dynamic_builder_.section_.sh_offset; |
| 461 | program_headers[PH_LOAD_RW_].p_paddr = dynamic_builder_.section_.sh_offset; |
| 462 | program_headers[PH_LOAD_RW_].p_filesz = dynamic_builder_.section_.sh_size; |
| 463 | program_headers[PH_LOAD_RW_].p_memsz = dynamic_builder_.section_.sh_size; |
| 464 | program_headers[PH_LOAD_RW_].p_align = dynamic_builder_.section_.sh_addralign; |
| 465 | |
| 466 | program_headers[PH_DYNAMIC].p_offset = dynamic_builder_.section_.sh_offset; |
| 467 | program_headers[PH_DYNAMIC].p_vaddr = dynamic_builder_.section_.sh_offset; |
| 468 | program_headers[PH_DYNAMIC].p_paddr = dynamic_builder_.section_.sh_offset; |
| 469 | program_headers[PH_DYNAMIC].p_filesz = dynamic_builder_.section_.sh_size; |
| 470 | program_headers[PH_DYNAMIC].p_memsz = dynamic_builder_.section_.sh_size; |
| 471 | program_headers[PH_DYNAMIC].p_align = dynamic_builder_.section_.sh_addralign; |
| 472 | |
| 473 | // Finish setup of the Ehdr values. |
| 474 | elf_header_.e_phoff = phdr_offset; |
| 475 | elf_header_.e_shoff = sections_offset; |
| 476 | elf_header_.e_phnum = PH_NUM; |
| 477 | elf_header_.e_shnum = section_ptrs.size(); |
| 478 | elf_header_.e_shstrndx = shstrtab_builder_.section_index_; |
| 479 | |
| 480 | // Add the rest of the pieces to the list. |
| 481 | pieces.push_back(ElfFilePiece("Elf Header", 0, &elf_header_, sizeof(elf_header_))); |
| 482 | pieces.push_back(ElfFilePiece("Program headers", phdr_offset, |
| 483 | &program_headers, sizeof(program_headers))); |
| 484 | pieces.push_back(ElfFilePiece(".dynamic", dynamic_builder_.section_.sh_offset, |
| 485 | dynamic.data(), dynamic_builder_.section_.sh_size)); |
| 486 | pieces.push_back(ElfFilePiece(".dynsym", dynsym_builder_.section_.sh_offset, |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 487 | dynsym.data(), dynsym.size() * sizeof(Elf32_Sym))); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 488 | pieces.push_back(ElfFilePiece(".dynstr", dynsym_builder_.strtab_.section_.sh_offset, |
| 489 | dynstr.c_str(), dynstr.size())); |
| 490 | pieces.push_back(ElfFilePiece(".hash", hash_builder_.section_.sh_offset, |
| 491 | hash.data(), hash.size() * sizeof(Elf32_Word))); |
| 492 | pieces.push_back(ElfFilePiece(".rodata", rodata_builder_.section_.sh_offset, |
Alex Light | 3470ab4 | 2014-06-18 10:35:45 -0700 | [diff] [blame] | 493 | nullptr, rodata_builder_.section_.sh_size)); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 494 | pieces.push_back(ElfFilePiece(".text", text_builder_.section_.sh_offset, |
Alex Light | 3470ab4 | 2014-06-18 10:35:45 -0700 | [diff] [blame] | 495 | nullptr, text_builder_.section_.sh_size)); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 496 | if (IncludingDebugSymbols()) { |
| 497 | pieces.push_back(ElfFilePiece(".symtab", symtab_builder_.section_.sh_offset, |
| 498 | symtab.data(), symtab.size() * sizeof(Elf32_Sym))); |
| 499 | pieces.push_back(ElfFilePiece(".strtab", symtab_builder_.strtab_.section_.sh_offset, |
| 500 | strtab.c_str(), strtab.size())); |
| 501 | } |
| 502 | pieces.push_back(ElfFilePiece(".shstrtab", shstrtab_builder_.section_.sh_offset, |
| 503 | &shstrtab[0], shstrtab.size())); |
| 504 | for (uint32_t i = 0; i < section_ptrs.size(); ++i) { |
| 505 | // Just add all the sections in induvidually since they are all over the |
| 506 | // place on the heap/stack. |
| 507 | Elf32_Word cur_off = sections_offset + i * sizeof(Elf32_Shdr); |
| 508 | pieces.push_back(ElfFilePiece("section table piece", cur_off, |
| 509 | section_ptrs[i], sizeof(Elf32_Shdr))); |
| 510 | } |
| 511 | |
| 512 | if (!WriteOutFile(pieces)) { |
| 513 | LOG(ERROR) << "Unable to write to file " << elf_file_->GetPath(); |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 514 | return false; |
| 515 | } |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 516 | // write out the actual oat file data. |
| 517 | Elf32_Word oat_data_offset = rodata_builder_.section_.sh_offset; |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 518 | if (static_cast<off_t>(oat_data_offset) != lseek(elf_file_->Fd(), oat_data_offset, SEEK_SET)) { |
| 519 | PLOG(ERROR) << "Failed to seek to .rodata offset " << oat_data_offset |
| 520 | << " for " << elf_file_->GetPath(); |
| 521 | return false; |
| 522 | } |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 523 | std::unique_ptr<BufferedOutputStream> output_stream( |
| 524 | new BufferedOutputStream(new FileOutputStream(elf_file_))); |
| 525 | if (!oat_writer_->Write(output_stream.get())) { |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 526 | PLOG(ERROR) << "Failed to write .rodata and .text for " << elf_file_->GetPath(); |
| 527 | return false; |
| 528 | } |
| 529 | |
Brian Carlstrom | 35f7225 | 2014-06-11 21:24:53 +0000 | [diff] [blame] | 530 | return true; |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | bool ElfWriterQuick::ElfBuilder::WriteOutFile(const std::vector<ElfFilePiece>& pieces) { |
| 534 | // TODO It would be nice if this checked for overlap. |
| 535 | for (auto it = pieces.begin(); it != pieces.end(); ++it) { |
| 536 | if (it->data_) { |
| 537 | if (static_cast<off_t>(it->offset_) != lseek(elf_file_->Fd(), it->offset_, SEEK_SET)) { |
| 538 | PLOG(ERROR) << "Failed to seek to " << it->dbg_name_ << " offset location " |
| 539 | << it->offset_ << " for " << elf_file_->GetPath(); |
| 540 | return false; |
| 541 | } |
| 542 | if (!elf_file_->WriteFully(it->data_, it->size_)) { |
| 543 | PLOG(ERROR) << "Failed to write " << it->dbg_name_ << " for " << elf_file_->GetPath(); |
| 544 | return false; |
| 545 | } |
| 546 | } |
| 547 | } |
| 548 | return true; |
| 549 | } |
| 550 | |
| 551 | void ElfWriterQuick::ElfBuilder::SetupDynamic() { |
| 552 | dynamic_builder_.AddDynamicTag(DT_HASH, 0, &hash_builder_); |
| 553 | dynamic_builder_.AddDynamicTag(DT_STRTAB, 0, &dynsym_builder_.strtab_); |
| 554 | dynamic_builder_.AddDynamicTag(DT_SYMTAB, 0, &dynsym_builder_); |
| 555 | dynamic_builder_.AddDynamicTag(DT_SYMENT, sizeof(Elf32_Sym)); |
| 556 | } |
| 557 | |
| 558 | void ElfWriterQuick::ElfBuilder::SetupRequiredSymbols() { |
| 559 | dynsym_builder_.AddSymbol("oatdata", &rodata_builder_, 0, true, |
| 560 | rodata_builder_.size_, STB_GLOBAL, STT_OBJECT); |
| 561 | dynsym_builder_.AddSymbol("oatexec", &text_builder_, 0, true, |
| 562 | text_builder_.size_, STB_GLOBAL, STT_OBJECT); |
| 563 | dynsym_builder_.AddSymbol("oatlastword", &text_builder_, text_builder_.size_ - 4, |
| 564 | true, 4, STB_GLOBAL, STT_OBJECT); |
| 565 | } |
| 566 | |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 567 | void ElfWriterQuick::ElfDynamicBuilder::AddDynamicTag(Elf32_Sword tag, Elf32_Word d_un) { |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 568 | if (tag == DT_NULL) { |
| 569 | return; |
| 570 | } |
Alex Light | 3470ab4 | 2014-06-18 10:35:45 -0700 | [diff] [blame] | 571 | dynamics_.push_back({nullptr, tag, d_un}); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 572 | } |
| 573 | |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 574 | void ElfWriterQuick::ElfDynamicBuilder::AddDynamicTag(Elf32_Sword tag, Elf32_Word d_un, |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 575 | ElfSectionBuilder* section) { |
| 576 | if (tag == DT_NULL) { |
| 577 | return; |
| 578 | } |
| 579 | dynamics_.push_back({section, tag, d_un}); |
| 580 | } |
| 581 | |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 582 | std::vector<Elf32_Dyn> ElfWriterQuick::ElfDynamicBuilder::GetDynamics(Elf32_Word strsz, |
| 583 | Elf32_Word soname) { |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 584 | std::vector<Elf32_Dyn> ret; |
| 585 | for (auto it = dynamics_.cbegin(); it != dynamics_.cend(); ++it) { |
| 586 | if (it->section_) { |
| 587 | // We are adding an address relative to a section. |
| 588 | ret.push_back( |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 589 | {it->tag_, {it->off_ + it->section_->section_.sh_addr}}); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 590 | } else { |
| 591 | ret.push_back({it->tag_, {it->off_}}); |
| 592 | } |
| 593 | } |
| 594 | ret.push_back({DT_STRSZ, {strsz}}); |
| 595 | ret.push_back({DT_SONAME, {soname}}); |
| 596 | ret.push_back({DT_NULL, {0}}); |
| 597 | return ret; |
| 598 | } |
| 599 | |
| 600 | std::vector<Elf32_Sym> ElfWriterQuick::ElfSymtabBuilder::GenerateSymtab() { |
| 601 | std::vector<Elf32_Sym> ret; |
| 602 | Elf32_Sym undef_sym; |
| 603 | memset(&undef_sym, 0, sizeof(undef_sym)); |
| 604 | undef_sym.st_shndx = SHN_UNDEF; |
| 605 | ret.push_back(undef_sym); |
| 606 | |
| 607 | for (auto it = symbols_.cbegin(); it != symbols_.cend(); ++it) { |
| 608 | Elf32_Sym sym; |
| 609 | memset(&sym, 0, sizeof(sym)); |
| 610 | sym.st_name = it->name_idx_; |
| 611 | if (it->is_relative_) { |
| 612 | sym.st_value = it->addr_ + it->section_->section_.sh_offset; |
| 613 | } else { |
| 614 | sym.st_value = it->addr_; |
| 615 | } |
| 616 | sym.st_size = it->size_; |
| 617 | sym.st_other = it->other_; |
| 618 | sym.st_shndx = it->section_->section_index_; |
| 619 | sym.st_info = it->info_; |
| 620 | |
| 621 | ret.push_back(sym); |
| 622 | } |
| 623 | return ret; |
| 624 | } |
| 625 | |
| 626 | std::string ElfWriterQuick::ElfSymtabBuilder::GenerateStrtab() { |
| 627 | std::string tab; |
| 628 | tab += '\0'; |
| 629 | for (auto it = symbols_.begin(); it != symbols_.end(); ++it) { |
| 630 | it->name_idx_ = tab.size(); |
| 631 | tab += it->name_; |
| 632 | tab += '\0'; |
| 633 | } |
| 634 | strtab_.section_.sh_size = tab.size(); |
| 635 | return tab; |
| 636 | } |
| 637 | |
| 638 | void ElfWriterQuick::ElfBuilder::AssignSectionStr( |
| 639 | ElfSectionBuilder* builder, std::string* strtab) { |
| 640 | builder->section_.sh_name = strtab->size(); |
| 641 | *strtab += builder->name_; |
| 642 | *strtab += '\0'; |
| 643 | if (debug_logging_) { |
| 644 | LOG(INFO) << "adding section name \"" << builder->name_ << "\" " |
| 645 | << "to shstrtab at offset " << builder->section_.sh_name; |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | // from bionic |
| 650 | static unsigned elfhash(const char *_name) { |
| 651 | const unsigned char *name = (const unsigned char *) _name; |
| 652 | unsigned h = 0, g; |
| 653 | |
| 654 | while (*name) { |
| 655 | h = (h << 4) + *name++; |
| 656 | g = h & 0xf0000000; |
| 657 | h ^= g; |
| 658 | h ^= g >> 24; |
| 659 | } |
| 660 | return h; |
| 661 | } |
| 662 | |
| 663 | |
| 664 | std::vector<Elf32_Word> ElfWriterQuick::ElfSymtabBuilder::GenerateHashContents() { |
| 665 | // Here is how The ELF hash table works. |
| 666 | // There are 3 arrays to worry about. |
| 667 | // * The symbol table where the symbol information is. |
| 668 | // * The bucket array which is an array of indexes into the symtab and chain. |
| 669 | // * The chain array which is also an array of indexes into the symtab and chain. |
| 670 | // |
| 671 | // Lets say the state is something like this. |
| 672 | // +--------+ +--------+ +-----------+ |
| 673 | // | symtab | | bucket | | chain | |
Alex Light | 3470ab4 | 2014-06-18 10:35:45 -0700 | [diff] [blame] | 674 | // | nullptr | | 1 | | STN_UNDEF | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 675 | // | <sym1> | | 4 | | 2 | |
| 676 | // | <sym2> | | | | 5 | |
| 677 | // | <sym3> | | | | STN_UNDEF | |
| 678 | // | <sym4> | | | | 3 | |
| 679 | // | <sym5> | | | | STN_UNDEF | |
| 680 | // +--------+ +--------+ +-----------+ |
| 681 | // |
| 682 | // The lookup process (in python psudocode) is |
| 683 | // |
| 684 | // def GetSym(name): |
| 685 | // # NB STN_UNDEF == 0 |
| 686 | // indx = bucket[elfhash(name) % num_buckets] |
| 687 | // while indx != STN_UNDEF: |
| 688 | // if GetSymbolName(symtab[indx]) == name: |
| 689 | // return symtab[indx] |
| 690 | // indx = chain[indx] |
| 691 | // return SYMBOL_NOT_FOUND |
| 692 | // |
| 693 | // Between bucket and chain arrays every symtab index must be present exactly |
| 694 | // once (except for STN_UNDEF, which must be present 1 + num_bucket times). |
| 695 | |
| 696 | // Select number of buckets. |
| 697 | // This is essentially arbitrary. |
| 698 | Elf32_Word nbuckets; |
Brian Carlstrom | 8758c64 | 2014-06-11 14:22:02 -0700 | [diff] [blame] | 699 | Elf32_Word chain_size = GetSize(); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 700 | if (symbols_.size() < 8) { |
| 701 | nbuckets = 2; |
| 702 | } else if (symbols_.size() < 32) { |
| 703 | nbuckets = 4; |
| 704 | } else if (symbols_.size() < 256) { |
| 705 | nbuckets = 16; |
| 706 | } else { |
| 707 | // Have about 32 ids per bucket. |
| 708 | nbuckets = RoundUp(symbols_.size()/32, 2); |
| 709 | } |
| 710 | std::vector<Elf32_Word> hash; |
| 711 | hash.push_back(nbuckets); |
| 712 | hash.push_back(chain_size); |
| 713 | uint32_t bucket_offset = hash.size(); |
| 714 | uint32_t chain_offset = bucket_offset + nbuckets; |
| 715 | hash.resize(hash.size() + nbuckets + chain_size, 0); |
| 716 | |
| 717 | Elf32_Word* buckets = hash.data() + bucket_offset; |
| 718 | Elf32_Word* chain = hash.data() + chain_offset; |
| 719 | |
| 720 | // Set up the actual hash table. |
| 721 | for (Elf32_Word i = 0; i < symbols_.size(); i++) { |
| 722 | // Add 1 since we need to have the null symbol that is not in the symbols |
| 723 | // list. |
| 724 | Elf32_Word index = i + 1; |
| 725 | Elf32_Word hash_val = static_cast<Elf32_Word>(elfhash(symbols_[i].name_.c_str())) % nbuckets; |
| 726 | if (buckets[hash_val] == 0) { |
| 727 | buckets[hash_val] = index; |
| 728 | } else { |
| 729 | hash_val = buckets[hash_val]; |
| 730 | CHECK_LT(hash_val, chain_size); |
| 731 | while (chain[hash_val] != 0) { |
| 732 | hash_val = chain[hash_val]; |
| 733 | CHECK_LT(hash_val, chain_size); |
| 734 | } |
| 735 | chain[hash_val] = index; |
| 736 | // Check for loops. Works because if this is non-empty then there must be |
| 737 | // another cell which already contains the same symbol index as this one, |
| 738 | // which means some symbol has more then one name, which isn't allowed. |
| 739 | CHECK_EQ(chain[index], static_cast<Elf32_Word>(0)); |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | return hash; |
| 744 | } |
| 745 | |
| 746 | void ElfWriterQuick::ElfBuilder::SetupEhdr() { |
| 747 | memset(&elf_header_, 0, sizeof(elf_header_)); |
| 748 | elf_header_.e_ident[EI_MAG0] = ELFMAG0; |
| 749 | elf_header_.e_ident[EI_MAG1] = ELFMAG1; |
| 750 | elf_header_.e_ident[EI_MAG2] = ELFMAG2; |
| 751 | elf_header_.e_ident[EI_MAG3] = ELFMAG3; |
| 752 | elf_header_.e_ident[EI_CLASS] = ELFCLASS32; |
| 753 | elf_header_.e_ident[EI_DATA] = ELFDATA2LSB; |
| 754 | elf_header_.e_ident[EI_VERSION] = EV_CURRENT; |
| 755 | elf_header_.e_ident[EI_OSABI] = ELFOSABI_LINUX; |
| 756 | elf_header_.e_ident[EI_ABIVERSION] = 0; |
| 757 | elf_header_.e_type = ET_DYN; |
| 758 | elf_header_.e_version = 1; |
| 759 | elf_header_.e_entry = 0; |
| 760 | elf_header_.e_ehsize = sizeof(Elf32_Ehdr); |
| 761 | elf_header_.e_phentsize = sizeof(Elf32_Phdr); |
| 762 | elf_header_.e_shentsize = sizeof(Elf32_Shdr); |
| 763 | elf_header_.e_phoff = sizeof(Elf32_Ehdr); |
| 764 | } |
| 765 | |
| 766 | void ElfWriterQuick::ElfBuilder::SetISA(InstructionSet isa) { |
| 767 | switch (isa) { |
| 768 | case kArm: |
| 769 | // Fall through. |
| 770 | case kThumb2: { |
| 771 | elf_header_.e_machine = EM_ARM; |
| 772 | elf_header_.e_flags = EF_ARM_EABI_VER5; |
| 773 | break; |
| 774 | } |
| 775 | case kArm64: { |
| 776 | elf_header_.e_machine = EM_AARCH64; |
| 777 | elf_header_.e_flags = 0; |
| 778 | break; |
| 779 | } |
| 780 | case kX86: { |
| 781 | elf_header_.e_machine = EM_386; |
| 782 | elf_header_.e_flags = 0; |
| 783 | break; |
| 784 | } |
| 785 | case kX86_64: { |
| 786 | elf_header_.e_machine = EM_X86_64; |
| 787 | elf_header_.e_flags = 0; |
| 788 | break; |
| 789 | } |
| 790 | case kMips: { |
| 791 | elf_header_.e_machine = EM_MIPS; |
| 792 | elf_header_.e_flags = (EF_MIPS_NOREORDER | |
| 793 | EF_MIPS_PIC | |
| 794 | EF_MIPS_CPIC | |
| 795 | EF_MIPS_ABI_O32 | |
| 796 | EF_MIPS_ARCH_32R2); |
| 797 | break; |
| 798 | } |
| 799 | default: { |
| 800 | fatal_error_ = true; |
| 801 | LOG(FATAL) << "Unknown instruction set: " << isa; |
| 802 | break; |
| 803 | } |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | void ElfWriterQuick::ElfSymtabBuilder::AddSymbol( |
| 808 | const std::string& name, const ElfSectionBuilder* section, Elf32_Addr addr, |
| 809 | bool is_relative, Elf32_Word size, uint8_t binding, uint8_t type, uint8_t other) { |
| 810 | CHECK(section); |
| 811 | ElfSymtabBuilder::ElfSymbolState state {name, section, addr, size, is_relative, |
| 812 | MakeStInfo(binding, type), other, 0}; |
| 813 | symbols_.push_back(state); |
| 814 | } |
| 815 | |
| 816 | bool ElfWriterQuick::Create(File* elf_file, |
| 817 | OatWriter* oat_writer, |
| 818 | const std::vector<const DexFile*>& dex_files, |
| 819 | const std::string& android_root, |
| 820 | bool is_host, |
| 821 | const CompilerDriver& driver) { |
| 822 | ElfWriterQuick elf_writer(driver, elf_file); |
| 823 | return elf_writer.Write(oat_writer, dex_files, android_root, is_host); |
| 824 | } |
| 825 | |
Alex Light | 53cb16b | 2014-06-12 11:26:29 -0700 | [diff] [blame] | 826 | // Add patch information to this section. Each patch is a Elf32_Word that |
| 827 | // identifies an offset from the start of the text section |
| 828 | void ElfWriterQuick::ReservePatchSpace(std::vector<uint8_t>* buffer, bool debug) { |
| 829 | size_t size = |
| 830 | compiler_driver_->GetCodeToPatch().size() + |
| 831 | compiler_driver_->GetMethodsToPatch().size() + |
| 832 | compiler_driver_->GetClassesToPatch().size(); |
| 833 | if (size == 0) { |
| 834 | if (debug) { |
| 835 | LOG(INFO) << "No patches to record"; |
| 836 | } |
| 837 | return; |
| 838 | } |
| 839 | buffer->resize(size * sizeof(uintptr_t)); |
| 840 | if (debug) { |
| 841 | LOG(INFO) << "Patches reserved for " << size; |
| 842 | } |
| 843 | } |
| 844 | |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 845 | static void EncodeUnsignedLeb128(uint32_t data, std::vector<uint8_t>* dst) { |
| 846 | size_t encoded_size = UnsignedLeb128Size(data); |
| 847 | size_t cur_index = dst->size(); |
| 848 | dst->resize(dst->size() + encoded_size); |
| 849 | uint8_t* write_pos = &((*dst)[cur_index]); |
| 850 | uint8_t* write_pos_after = EncodeUnsignedLeb128(write_pos, data); |
| 851 | DCHECK_EQ(static_cast<size_t>(write_pos_after - write_pos), encoded_size); |
| 852 | } |
| 853 | |
| 854 | static void EncodeSignedLeb128(int32_t data, std::vector<uint8_t>* dst) { |
| 855 | size_t encoded_size = SignedLeb128Size(data); |
| 856 | size_t cur_index = dst->size(); |
| 857 | dst->resize(dst->size() + encoded_size); |
| 858 | uint8_t* write_pos = &((*dst)[cur_index]); |
| 859 | uint8_t* write_pos_after = EncodeSignedLeb128(write_pos, data); |
| 860 | DCHECK_EQ(static_cast<size_t>(write_pos_after - write_pos), encoded_size); |
| 861 | } |
| 862 | |
| 863 | std::vector<uint8_t>* ConstructCIEFrameX86(bool is_x86_64) { |
| 864 | std::vector<uint8_t>*cfi_info = new std::vector<uint8_t>; |
| 865 | |
| 866 | // Length (will be filled in later in this routine). |
| 867 | PushWord(cfi_info, 0); |
| 868 | |
| 869 | // CIE id: always 0. |
| 870 | PushWord(cfi_info, 0); |
| 871 | |
| 872 | // Version: always 1. |
| 873 | cfi_info->push_back(0x01); |
| 874 | |
| 875 | // Augmentation: 'zR\0' |
| 876 | cfi_info->push_back(0x7a); |
| 877 | cfi_info->push_back(0x52); |
| 878 | cfi_info->push_back(0x0); |
| 879 | |
| 880 | // Code alignment: 1. |
| 881 | EncodeUnsignedLeb128(1, cfi_info); |
| 882 | |
| 883 | // Data alignment. |
| 884 | if (is_x86_64) { |
| 885 | EncodeSignedLeb128(-8, cfi_info); |
| 886 | } else { |
| 887 | EncodeSignedLeb128(-4, cfi_info); |
| 888 | } |
| 889 | |
| 890 | // Return address register. |
| 891 | if (is_x86_64) { |
| 892 | // R16(RIP) |
| 893 | cfi_info->push_back(0x10); |
| 894 | } else { |
| 895 | // R8(EIP) |
| 896 | cfi_info->push_back(0x08); |
| 897 | } |
| 898 | |
| 899 | // Augmentation length: 1. |
| 900 | cfi_info->push_back(1); |
| 901 | |
| 902 | // Augmentation data: 0x03 ((DW_EH_PE_absptr << 4) | DW_EH_PE_udata4). |
| 903 | cfi_info->push_back(0x03); |
| 904 | |
| 905 | // Initial instructions. |
| 906 | if (is_x86_64) { |
| 907 | // DW_CFA_def_cfa R7(RSP) 8. |
| 908 | cfi_info->push_back(0x0c); |
| 909 | cfi_info->push_back(0x07); |
| 910 | cfi_info->push_back(0x08); |
| 911 | |
| 912 | // DW_CFA_offset R16(RIP) 1 (* -8). |
| 913 | cfi_info->push_back(0x90); |
| 914 | cfi_info->push_back(0x01); |
| 915 | } else { |
| 916 | // DW_CFA_def_cfa R4(ESP) 4. |
| 917 | cfi_info->push_back(0x0c); |
| 918 | cfi_info->push_back(0x04); |
| 919 | cfi_info->push_back(0x04); |
| 920 | |
| 921 | // DW_CFA_offset R8(EIP) 1 (* -4). |
| 922 | cfi_info->push_back(0x88); |
| 923 | cfi_info->push_back(0x01); |
| 924 | } |
| 925 | |
| 926 | // Padding to a multiple of 4 |
| 927 | while ((cfi_info->size() & 3) != 0) { |
| 928 | // DW_CFA_nop is encoded as 0. |
| 929 | cfi_info->push_back(0); |
| 930 | } |
| 931 | |
| 932 | // Set the length of the CIE inside the generated bytes. |
| 933 | uint32_t length = cfi_info->size() - 4; |
| 934 | (*cfi_info)[0] = length; |
| 935 | (*cfi_info)[1] = length >> 8; |
| 936 | (*cfi_info)[2] = length >> 16; |
| 937 | (*cfi_info)[3] = length >> 24; |
| 938 | return cfi_info; |
| 939 | } |
| 940 | |
| 941 | std::vector<uint8_t>* ConstructCIEFrame(InstructionSet isa) { |
| 942 | switch (isa) { |
| 943 | case kX86: |
| 944 | return ConstructCIEFrameX86(false); |
| 945 | case kX86_64: |
| 946 | return ConstructCIEFrameX86(true); |
| 947 | |
| 948 | default: |
| 949 | // Not implemented. |
| 950 | return nullptr; |
| 951 | } |
| 952 | } |
| 953 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 954 | bool ElfWriterQuick::Write(OatWriter* oat_writer, |
| 955 | const std::vector<const DexFile*>& dex_files_unused, |
| 956 | const std::string& android_root_unused, |
| 957 | bool is_host_unused) { |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 958 | constexpr bool debug = false; |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 959 | const OatHeader& oat_header = oat_writer->GetOatHeader(); |
| 960 | Elf32_Word oat_data_size = oat_header.GetExecutableOffset(); |
| 961 | uint32_t oat_exec_size = oat_writer->GetSize() - oat_data_size; |
| 962 | |
| 963 | ElfBuilder builder(oat_writer, elf_file_, compiler_driver_->GetInstructionSet(), 0, |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 964 | oat_data_size, oat_data_size, oat_exec_size, |
| 965 | compiler_driver_->GetCompilerOptions().GetIncludeDebugSymbols(), |
| 966 | debug); |
Alex Light | 78382fa | 2014-06-06 15:45:32 -0700 | [diff] [blame] | 967 | |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 968 | if (compiler_driver_->GetCompilerOptions().GetIncludeDebugSymbols()) { |
| 969 | WriteDebugSymbols(builder, oat_writer); |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 970 | } |
| 971 | |
Alex Light | 53cb16b | 2014-06-12 11:26:29 -0700 | [diff] [blame] | 972 | if (compiler_driver_->GetCompilerOptions().GetIncludePatchInformation()) { |
| 973 | ElfRawSectionBuilder oat_patches(".oat_patches", SHT_OAT_PATCH, 0, NULL, 0, |
| 974 | sizeof(size_t), sizeof(size_t)); |
| 975 | ReservePatchSpace(oat_patches.GetBuffer(), debug); |
| 976 | builder.RegisterRawSection(oat_patches); |
| 977 | } |
| 978 | |
Brian Carlstrom | b12f347 | 2014-06-11 14:54:46 -0700 | [diff] [blame] | 979 | return builder.Write(); |
| 980 | } |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 981 | |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 982 | void ElfWriterQuick::WriteDebugSymbols(ElfBuilder& builder, OatWriter* oat_writer) { |
| 983 | std::unique_ptr<std::vector<uint8_t>> cfi_info( |
| 984 | ConstructCIEFrame(compiler_driver_->GetInstructionSet())); |
| 985 | |
| 986 | // Iterate over the compiled methods. |
Alex Light | 78382fa | 2014-06-06 15:45:32 -0700 | [diff] [blame] | 987 | const std::vector<OatWriter::DebugInfo>& method_info = oat_writer->GetCFIMethodInfo(); |
| 988 | ElfSymtabBuilder* symtab = &builder.symtab_builder_; |
| 989 | for (auto it = method_info.begin(); it != method_info.end(); ++it) { |
| 990 | symtab->AddSymbol(it->method_name_, &builder.text_builder_, it->low_pc_, true, |
| 991 | it->high_pc_ - it->low_pc_, STB_GLOBAL, STT_FUNC); |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 992 | |
| 993 | // Include CFI for compiled method, if possible. |
| 994 | if (cfi_info.get() != nullptr) { |
| 995 | DCHECK(it->compiled_method_ != nullptr); |
| 996 | |
| 997 | // Copy in the FDE, if present |
| 998 | const std::vector<uint8_t>* fde = it->compiled_method_->GetCFIInfo(); |
| 999 | if (fde != nullptr) { |
| 1000 | // Copy the information into cfi_info and then fix the address in the new copy. |
| 1001 | int cur_offset = cfi_info->size(); |
| 1002 | cfi_info->insert(cfi_info->end(), fde->begin(), fde->end()); |
| 1003 | |
| 1004 | // Set the 'CIE_pointer' field to cur_offset+4. |
| 1005 | uint32_t CIE_pointer = cur_offset + 4; |
| 1006 | uint32_t offset_to_update = cur_offset + sizeof(uint32_t); |
| 1007 | (*cfi_info)[offset_to_update+0] = CIE_pointer; |
| 1008 | (*cfi_info)[offset_to_update+1] = CIE_pointer >> 8; |
| 1009 | (*cfi_info)[offset_to_update+2] = CIE_pointer >> 16; |
| 1010 | (*cfi_info)[offset_to_update+3] = CIE_pointer >> 24; |
| 1011 | |
| 1012 | // Set the 'initial_location' field to address the start of the method. |
| 1013 | offset_to_update = cur_offset + 2*sizeof(uint32_t); |
| 1014 | const uint32_t quick_code_start = it->low_pc_; |
| 1015 | (*cfi_info)[offset_to_update+0] = quick_code_start; |
| 1016 | (*cfi_info)[offset_to_update+1] = quick_code_start >> 8; |
| 1017 | (*cfi_info)[offset_to_update+2] = quick_code_start >> 16; |
| 1018 | (*cfi_info)[offset_to_update+3] = quick_code_start >> 24; |
| 1019 | } |
| 1020 | } |
Alex Light | 78382fa | 2014-06-06 15:45:32 -0700 | [diff] [blame] | 1021 | } |
Alex Light | 78382fa | 2014-06-06 15:45:32 -0700 | [diff] [blame] | 1022 | |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 1023 | if (cfi_info.get() != nullptr) { |
| 1024 | // Now lay down the Elf sections. |
| 1025 | ElfRawSectionBuilder debug_info(".debug_info", SHT_PROGBITS, 0, nullptr, 0, 1, 0); |
| 1026 | ElfRawSectionBuilder debug_abbrev(".debug_abbrev", SHT_PROGBITS, 0, nullptr, 0, 1, 0); |
| 1027 | ElfRawSectionBuilder debug_str(".debug_str", SHT_PROGBITS, 0, nullptr, 0, 1, 0); |
| 1028 | ElfRawSectionBuilder eh_frame(".eh_frame", SHT_PROGBITS, SHF_ALLOC, nullptr, 0, 4, 0); |
| 1029 | eh_frame.SetBuffer(std::move(*cfi_info.get())); |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 1030 | |
Andreas Gampe | 7927380 | 2014-08-05 20:21:05 -0700 | [diff] [blame^] | 1031 | FillInCFIInformation(oat_writer, debug_info.GetBuffer(), debug_abbrev.GetBuffer(), |
| 1032 | debug_str.GetBuffer()); |
| 1033 | builder.RegisterRawSection(debug_info); |
| 1034 | builder.RegisterRawSection(debug_abbrev); |
| 1035 | builder.RegisterRawSection(eh_frame); |
| 1036 | builder.RegisterRawSection(debug_str); |
| 1037 | } |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 1038 | } |
| 1039 | |
Mark Mendell | ae9fd93 | 2014-02-10 16:14:35 -0800 | [diff] [blame] | 1040 | void ElfWriterQuick::FillInCFIInformation(OatWriter* oat_writer, |
| 1041 | std::vector<uint8_t>* dbg_info, |
| 1042 | std::vector<uint8_t>* dbg_abbrev, |
| 1043 | std::vector<uint8_t>* dbg_str) { |
| 1044 | // Create the debug_abbrev section with boilerplate information. |
| 1045 | // We only care about low_pc and high_pc right now for the compilation |
| 1046 | // unit and methods. |
| 1047 | |
| 1048 | // Tag 1: Compilation unit: DW_TAG_compile_unit. |
| 1049 | dbg_abbrev->push_back(1); |
| 1050 | dbg_abbrev->push_back(DW_TAG_compile_unit); |
| 1051 | |
| 1052 | // There are children (the methods). |
| 1053 | dbg_abbrev->push_back(DW_CHILDREN_yes); |
| 1054 | |
| 1055 | // DW_LANG_Java DW_FORM_data1. |
| 1056 | dbg_abbrev->push_back(DW_AT_language); |
| 1057 | dbg_abbrev->push_back(DW_FORM_data1); |
| 1058 | |
| 1059 | // DW_AT_low_pc DW_FORM_addr. |
| 1060 | dbg_abbrev->push_back(DW_AT_low_pc); |
| 1061 | dbg_abbrev->push_back(DW_FORM_addr); |
| 1062 | |
| 1063 | // DW_AT_high_pc DW_FORM_addr. |
| 1064 | dbg_abbrev->push_back(DW_AT_high_pc); |
| 1065 | dbg_abbrev->push_back(DW_FORM_addr); |
| 1066 | |
| 1067 | // End of DW_TAG_compile_unit. |
| 1068 | PushHalf(dbg_abbrev, 0); |
| 1069 | |
| 1070 | // Tag 2: Compilation unit: DW_TAG_subprogram. |
| 1071 | dbg_abbrev->push_back(2); |
| 1072 | dbg_abbrev->push_back(DW_TAG_subprogram); |
| 1073 | |
| 1074 | // There are no children. |
| 1075 | dbg_abbrev->push_back(DW_CHILDREN_no); |
| 1076 | |
| 1077 | // Name of the method. |
| 1078 | dbg_abbrev->push_back(DW_AT_name); |
| 1079 | dbg_abbrev->push_back(DW_FORM_strp); |
| 1080 | |
| 1081 | // DW_AT_low_pc DW_FORM_addr. |
| 1082 | dbg_abbrev->push_back(DW_AT_low_pc); |
| 1083 | dbg_abbrev->push_back(DW_FORM_addr); |
| 1084 | |
| 1085 | // DW_AT_high_pc DW_FORM_addr. |
| 1086 | dbg_abbrev->push_back(DW_AT_high_pc); |
| 1087 | dbg_abbrev->push_back(DW_FORM_addr); |
| 1088 | |
| 1089 | // End of DW_TAG_subprogram. |
| 1090 | PushHalf(dbg_abbrev, 0); |
| 1091 | |
| 1092 | // Start the debug_info section with the header information |
| 1093 | // 'unit_length' will be filled in later. |
| 1094 | PushWord(dbg_info, 0); |
| 1095 | |
| 1096 | // 'version' - 3. |
| 1097 | PushHalf(dbg_info, 3); |
| 1098 | |
| 1099 | // Offset into .debug_abbrev section (always 0). |
| 1100 | PushWord(dbg_info, 0); |
| 1101 | |
| 1102 | // Address size: 4. |
| 1103 | dbg_info->push_back(4); |
| 1104 | |
| 1105 | // Start the description for the compilation unit. |
| 1106 | // This uses tag 1. |
| 1107 | dbg_info->push_back(1); |
| 1108 | |
| 1109 | // The language is Java. |
| 1110 | dbg_info->push_back(DW_LANG_Java); |
| 1111 | |
| 1112 | // Leave space for low_pc and high_pc. |
| 1113 | int low_pc_offset = dbg_info->size(); |
| 1114 | PushWord(dbg_info, 0); |
| 1115 | PushWord(dbg_info, 0); |
| 1116 | |
| 1117 | // Walk through the information in the method table, and enter into dbg_info. |
| 1118 | const std::vector<OatWriter::DebugInfo>& dbg = oat_writer->GetCFIMethodInfo(); |
| 1119 | uint32_t low_pc = 0xFFFFFFFFU; |
| 1120 | uint32_t high_pc = 0; |
| 1121 | |
| 1122 | for (uint32_t i = 0; i < dbg.size(); i++) { |
| 1123 | const OatWriter::DebugInfo& info = dbg[i]; |
| 1124 | if (info.low_pc_ < low_pc) { |
| 1125 | low_pc = info.low_pc_; |
| 1126 | } |
| 1127 | if (info.high_pc_ > high_pc) { |
| 1128 | high_pc = info.high_pc_; |
| 1129 | } |
| 1130 | |
| 1131 | // Start a new TAG: subroutine (2). |
| 1132 | dbg_info->push_back(2); |
| 1133 | |
| 1134 | // Enter the name into the string table (and NUL terminate). |
| 1135 | uint32_t str_offset = dbg_str->size(); |
| 1136 | dbg_str->insert(dbg_str->end(), info.method_name_.begin(), info.method_name_.end()); |
| 1137 | dbg_str->push_back('\0'); |
| 1138 | |
| 1139 | // Enter name, low_pc, high_pc. |
| 1140 | PushWord(dbg_info, str_offset); |
| 1141 | PushWord(dbg_info, info.low_pc_); |
| 1142 | PushWord(dbg_info, info.high_pc_); |
| 1143 | } |
| 1144 | |
| 1145 | // One byte terminator |
| 1146 | dbg_info->push_back(0); |
| 1147 | |
| 1148 | // We have now walked all the methods. Fill in lengths and low/high PCs. |
| 1149 | UpdateWord(dbg_info, 0, dbg_info->size() - 4); |
| 1150 | UpdateWord(dbg_info, low_pc_offset, low_pc); |
| 1151 | UpdateWord(dbg_info, low_pc_offset + 4, high_pc); |
Brian Carlstrom | 7940e44 | 2013-07-12 13:46:57 -0700 | [diff] [blame] | 1152 | } |
| 1153 | |
| 1154 | } // namespace art |