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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Platform-specific code for Linux goes here. For the POSIX-compatible | |
| 6 // parts, the implementation is in platform-posix.cc. | |
| 7 | |
| 8 #include <pthread.h> | |
| 9 #include <semaphore.h> | |
| 10 #include <signal.h> | |
| 11 #include <stdlib.h> | |
| 12 #include <sys/prctl.h> | |
| 13 #include <sys/resource.h> | |
| 14 #include <sys/syscall.h> | |
| 15 #include <sys/time.h> | |
| 16 #include <sys/types.h> | |
| 17 | |
| 18 // Ubuntu Dapper requires memory pages to be marked as | |
| 19 // executable. Otherwise, OS raises an exception when executing code | |
| 20 // in that page. | |
| 21 #include <errno.h> | |
| 22 #include <fcntl.h> // open | |
| 23 #include <stdarg.h> | |
| 24 #include <strings.h> // index | |
| 25 #include <sys/mman.h> // mmap & munmap | |
| 26 #include <sys/stat.h> // open | |
| 27 #include <sys/types.h> // mmap & munmap | |
| 28 #include <unistd.h> // sysconf | |
| 29 | |
| 30 // GLibc on ARM defines mcontext_t has a typedef for 'struct sigcontext'. | |
| 31 // Old versions of the C library <signal.h> didn't define the type. | |
| 32 #if defined(__ANDROID__) && !defined(__BIONIC_HAVE_UCONTEXT_T) && \ | |
| 33 (defined(__arm__) || defined(__aarch64__)) && \ | |
| 34 !defined(__BIONIC_HAVE_STRUCT_SIGCONTEXT) | |
| 35 #include <asm/sigcontext.h> // NOLINT | |
| 36 #endif | |
| 37 | |
| 38 #if defined(LEAK_SANITIZER) | |
| 39 #include <sanitizer/lsan_interface.h> | |
| 40 #endif | |
| 41 | |
| 42 #include <cmath> | |
| 43 | |
| 44 #undef MAP_TYPE | |
| 45 | |
| 46 #include "src/platform.h" | |
| 47 #include "src/utils.h" | |
| 48 | |
| 49 | |
| 50 namespace v8 { | |
| 51 namespace internal { | |
| 52 | |
| 53 | |
| 54 #ifdef __arm__ | |
| 55 | |
| 56 bool OS::ArmUsingHardFloat() { | |
| 57 // GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify | |
| 58 // the Floating Point ABI used (PCS stands for Procedure Call Standard). | |
| 59 // We use these as well as a couple of other defines to statically determine | |
| 60 // what FP ABI used. | |
| 61 // GCC versions 4.4 and below don't support hard-fp. | |
| 62 // GCC versions 4.5 may support hard-fp without defining __ARM_PCS or | |
| 63 // __ARM_PCS_VFP. | |
| 64 | |
| 65 #define GCC_VERSION (__GNUC__ * 10000 \ | |
| 66 + __GNUC_MINOR__ * 100 \ | |
| 67 + __GNUC_PATCHLEVEL__) | |
| 68 #if GCC_VERSION >= 40600 | |
| 69 #if defined(__ARM_PCS_VFP) | |
| 70 return true; | |
| 71 #else | |
| 72 return false; | |
| 73 #endif | |
| 74 | |
| 75 #elif GCC_VERSION < 40500 | |
| 76 return false; | |
| 77 | |
| 78 #else | |
| 79 #if defined(__ARM_PCS_VFP) | |
| 80 return true; | |
| 81 #elif defined(__ARM_PCS) || defined(__SOFTFP__) || defined(__SOFTFP) || \ | |
| 82 !defined(__VFP_FP__) | |
| 83 return false; | |
| 84 #else | |
| 85 #error "Your version of GCC does not report the FP ABI compiled for." \ | |
| 86 "Please report it on this issue" \ | |
| 87 "http://code.google.com/p/v8/issues/detail?id=2140" | |
| 88 | |
| 89 #endif | |
| 90 #endif | |
| 91 #undef GCC_VERSION | |
| 92 } | |
| 93 | |
| 94 #endif // def __arm__ | |
| 95 | |
| 96 | |
| 97 const char* OS::LocalTimezone(double time, TimezoneCache* cache) { | |
| 98 if (std::isnan(time)) return ""; | |
| 99 time_t tv = static_cast<time_t>(std::floor(time/msPerSecond)); | |
| 100 struct tm* t = localtime(&tv); | |
| 101 if (NULL == t) return ""; | |
| 102 return t->tm_zone; | |
| 103 } | |
| 104 | |
| 105 | |
| 106 double OS::LocalTimeOffset(TimezoneCache* cache) { | |
| 107 time_t tv = time(NULL); | |
| 108 struct tm* t = localtime(&tv); | |
| 109 // tm_gmtoff includes any daylight savings offset, so subtract it. | |
| 110 return static_cast<double>(t->tm_gmtoff * msPerSecond - | |
| 111 (t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); | |
| 112 } | |
| 113 | |
| 114 | |
| 115 void* OS::Allocate(const size_t requested, | |
| 116 size_t* allocated, | |
| 117 bool is_executable) { | |
| 118 const size_t msize = RoundUp(requested, AllocateAlignment()); | |
| 119 int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); | |
| 120 void* addr = OS::GetRandomMmapAddr(); | |
| 121 void* mbase = mmap(addr, msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
| 122 if (mbase == MAP_FAILED) return NULL; | |
| 123 *allocated = msize; | |
| 124 return mbase; | |
| 125 } | |
| 126 | |
| 127 | |
| 128 class PosixMemoryMappedFile : public OS::MemoryMappedFile { | |
| 129 public: | |
| 130 PosixMemoryMappedFile(FILE* file, void* memory, int size) | |
| 131 : file_(file), memory_(memory), size_(size) { } | |
| 132 virtual ~PosixMemoryMappedFile(); | |
| 133 virtual void* memory() { return memory_; } | |
| 134 virtual int size() { return size_; } | |
| 135 private: | |
| 136 FILE* file_; | |
| 137 void* memory_; | |
| 138 int size_; | |
| 139 }; | |
| 140 | |
| 141 | |
| 142 OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { | |
| 143 FILE* file = fopen(name, "r+"); | |
| 144 if (file == NULL) return NULL; | |
| 145 | |
| 146 fseek(file, 0, SEEK_END); | |
| 147 int size = ftell(file); | |
| 148 | |
| 149 void* memory = | |
| 150 mmap(OS::GetRandomMmapAddr(), | |
| 151 size, | |
| 152 PROT_READ | PROT_WRITE, | |
| 153 MAP_SHARED, | |
| 154 fileno(file), | |
| 155 0); | |
| 156 return new PosixMemoryMappedFile(file, memory, size); | |
| 157 } | |
| 158 | |
| 159 | |
| 160 OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, | |
| 161 void* initial) { | |
| 162 FILE* file = fopen(name, "w+"); | |
| 163 if (file == NULL) return NULL; | |
| 164 int result = fwrite(initial, size, 1, file); | |
| 165 if (result < 1) { | |
| 166 fclose(file); | |
| 167 return NULL; | |
| 168 } | |
| 169 void* memory = | |
| 170 mmap(OS::GetRandomMmapAddr(), | |
| 171 size, | |
| 172 PROT_READ | PROT_WRITE, | |
| 173 MAP_SHARED, | |
| 174 fileno(file), | |
| 175 0); | |
| 176 return new PosixMemoryMappedFile(file, memory, size); | |
| 177 } | |
| 178 | |
| 179 | |
| 180 PosixMemoryMappedFile::~PosixMemoryMappedFile() { | |
| 181 if (memory_) OS::Free(memory_, size_); | |
| 182 fclose(file_); | |
| 183 } | |
| 184 | |
| 185 | |
| 186 std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() { | |
| 187 std::vector<SharedLibraryAddress> result; | |
| 188 // This function assumes that the layout of the file is as follows: | |
| 189 // hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name] | |
| 190 // If we encounter an unexpected situation we abort scanning further entries. | |
| 191 FILE* fp = fopen("/proc/self/maps", "r"); | |
| 192 if (fp == NULL) return result; | |
| 193 | |
| 194 // Allocate enough room to be able to store a full file name. | |
| 195 const int kLibNameLen = FILENAME_MAX + 1; | |
| 196 char* lib_name = reinterpret_cast<char*>(malloc(kLibNameLen)); | |
| 197 | |
| 198 // This loop will terminate once the scanning hits an EOF. | |
| 199 while (true) { | |
| 200 uintptr_t start, end; | |
| 201 char attr_r, attr_w, attr_x, attr_p; | |
| 202 // Parse the addresses and permission bits at the beginning of the line. | |
| 203 if (fscanf(fp, "%" V8PRIxPTR "-%" V8PRIxPTR, &start, &end) != 2) break; | |
| 204 if (fscanf(fp, " %c%c%c%c", &attr_r, &attr_w, &attr_x, &attr_p) != 4) break; | |
| 205 | |
| 206 int c; | |
| 207 if (attr_r == 'r' && attr_w != 'w' && attr_x == 'x') { | |
| 208 // Found a read-only executable entry. Skip characters until we reach | |
| 209 // the beginning of the filename or the end of the line. | |
| 210 do { | |
| 211 c = getc(fp); | |
| 212 } while ((c != EOF) && (c != '\n') && (c != '/') && (c != '[')); | |
| 213 if (c == EOF) break; // EOF: Was unexpected, just exit. | |
| 214 | |
| 215 // Process the filename if found. | |
| 216 if ((c == '/') || (c == '[')) { | |
| 217 // Push the '/' or '[' back into the stream to be read below. | |
| 218 ungetc(c, fp); | |
| 219 | |
| 220 // Read to the end of the line. Exit if the read fails. | |
| 221 if (fgets(lib_name, kLibNameLen, fp) == NULL) break; | |
| 222 | |
| 223 // Drop the newline character read by fgets. We do not need to check | |
| 224 // for a zero-length string because we know that we at least read the | |
| 225 // '/' or '[' character. | |
| 226 lib_name[strlen(lib_name) - 1] = '\0'; | |
| 227 } else { | |
| 228 // No library name found, just record the raw address range. | |
| 229 snprintf(lib_name, kLibNameLen, | |
| 230 "%08" V8PRIxPTR "-%08" V8PRIxPTR, start, end); | |
| 231 } | |
| 232 result.push_back(SharedLibraryAddress(lib_name, start, end)); | |
| 233 } else { | |
| 234 // Entry not describing executable data. Skip to end of line to set up | |
| 235 // reading the next entry. | |
| 236 do { | |
| 237 c = getc(fp); | |
| 238 } while ((c != EOF) && (c != '\n')); | |
| 239 if (c == EOF) break; | |
| 240 } | |
| 241 } | |
| 242 free(lib_name); | |
| 243 fclose(fp); | |
| 244 return result; | |
| 245 } | |
| 246 | |
| 247 | |
| 248 void OS::SignalCodeMovingGC() { | |
| 249 // Support for ll_prof.py. | |
| 250 // | |
| 251 // The Linux profiler built into the kernel logs all mmap's with | |
| 252 // PROT_EXEC so that analysis tools can properly attribute ticks. We | |
| 253 // do a mmap with a name known by ll_prof.py and immediately munmap | |
| 254 // it. This injects a GC marker into the stream of events generated | |
| 255 // by the kernel and allows us to synchronize V8 code log and the | |
| 256 // kernel log. | |
| 257 int size = sysconf(_SC_PAGESIZE); | |
| 258 FILE* f = fopen(OS::GetGCFakeMMapFile(), "w+"); | |
| 259 if (f == NULL) { | |
| 260 OS::PrintError("Failed to open %s\n", OS::GetGCFakeMMapFile()); | |
| 261 OS::Abort(); | |
| 262 } | |
| 263 void* addr = mmap(OS::GetRandomMmapAddr(), | |
| 264 size, | |
| 265 #if defined(__native_client__) | |
| 266 // The Native Client port of V8 uses an interpreter, | |
| 267 // so code pages don't need PROT_EXEC. | |
| 268 PROT_READ, | |
| 269 #else | |
| 270 PROT_READ | PROT_EXEC, | |
| 271 #endif | |
| 272 MAP_PRIVATE, | |
| 273 fileno(f), | |
| 274 0); | |
| 275 ASSERT(addr != MAP_FAILED); | |
| 276 OS::Free(addr, size); | |
| 277 fclose(f); | |
| 278 } | |
| 279 | |
| 280 | |
| 281 // Constants used for mmap. | |
| 282 static const int kMmapFd = -1; | |
| 283 static const int kMmapFdOffset = 0; | |
| 284 | |
| 285 | |
| 286 VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { } | |
| 287 | |
| 288 | |
| 289 VirtualMemory::VirtualMemory(size_t size) | |
| 290 : address_(ReserveRegion(size)), size_(size) { } | |
| 291 | |
| 292 | |
| 293 VirtualMemory::VirtualMemory(size_t size, size_t alignment) | |
| 294 : address_(NULL), size_(0) { | |
| 295 ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment()))); | |
| 296 size_t request_size = RoundUp(size + alignment, | |
| 297 static_cast<intptr_t>(OS::AllocateAlignment())); | |
| 298 void* reservation = mmap(OS::GetRandomMmapAddr(), | |
| 299 request_size, | |
| 300 PROT_NONE, | |
| 301 MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, | |
| 302 kMmapFd, | |
| 303 kMmapFdOffset); | |
| 304 if (reservation == MAP_FAILED) return; | |
| 305 | |
| 306 uint8_t* base = static_cast<uint8_t*>(reservation); | |
| 307 uint8_t* aligned_base = RoundUp(base, alignment); | |
| 308 ASSERT_LE(base, aligned_base); | |
| 309 | |
| 310 // Unmap extra memory reserved before and after the desired block. | |
| 311 if (aligned_base != base) { | |
| 312 size_t prefix_size = static_cast<size_t>(aligned_base - base); | |
| 313 OS::Free(base, prefix_size); | |
| 314 request_size -= prefix_size; | |
| 315 } | |
| 316 | |
| 317 size_t aligned_size = RoundUp(size, OS::AllocateAlignment()); | |
| 318 ASSERT_LE(aligned_size, request_size); | |
| 319 | |
| 320 if (aligned_size != request_size) { | |
| 321 size_t suffix_size = request_size - aligned_size; | |
| 322 OS::Free(aligned_base + aligned_size, suffix_size); | |
| 323 request_size -= suffix_size; | |
| 324 } | |
| 325 | |
| 326 ASSERT(aligned_size == request_size); | |
| 327 | |
| 328 address_ = static_cast<void*>(aligned_base); | |
| 329 size_ = aligned_size; | |
| 330 #if defined(LEAK_SANITIZER) | |
| 331 __lsan_register_root_region(address_, size_); | |
| 332 #endif | |
| 333 } | |
| 334 | |
| 335 | |
| 336 VirtualMemory::~VirtualMemory() { | |
| 337 if (IsReserved()) { | |
| 338 bool result = ReleaseRegion(address(), size()); | |
| 339 ASSERT(result); | |
| 340 USE(result); | |
| 341 } | |
| 342 } | |
| 343 | |
| 344 | |
| 345 bool VirtualMemory::IsReserved() { | |
| 346 return address_ != NULL; | |
| 347 } | |
| 348 | |
| 349 | |
| 350 void VirtualMemory::Reset() { | |
| 351 address_ = NULL; | |
| 352 size_ = 0; | |
| 353 } | |
| 354 | |
| 355 | |
| 356 bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { | |
| 357 return CommitRegion(address, size, is_executable); | |
| 358 } | |
| 359 | |
| 360 | |
| 361 bool VirtualMemory::Uncommit(void* address, size_t size) { | |
| 362 return UncommitRegion(address, size); | |
| 363 } | |
| 364 | |
| 365 | |
| 366 bool VirtualMemory::Guard(void* address) { | |
| 367 OS::Guard(address, OS::CommitPageSize()); | |
| 368 return true; | |
| 369 } | |
| 370 | |
| 371 | |
| 372 void* VirtualMemory::ReserveRegion(size_t size) { | |
| 373 void* result = mmap(OS::GetRandomMmapAddr(), | |
| 374 size, | |
| 375 PROT_NONE, | |
| 376 MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, | |
| 377 kMmapFd, | |
| 378 kMmapFdOffset); | |
| 379 | |
| 380 if (result == MAP_FAILED) return NULL; | |
| 381 | |
| 382 #if defined(LEAK_SANITIZER) | |
| 383 __lsan_register_root_region(result, size); | |
| 384 #endif | |
| 385 return result; | |
| 386 } | |
| 387 | |
| 388 | |
| 389 bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { | |
| 390 #if defined(__native_client__) | |
| 391 // The Native Client port of V8 uses an interpreter, | |
| 392 // so code pages don't need PROT_EXEC. | |
| 393 int prot = PROT_READ | PROT_WRITE; | |
| 394 #else | |
| 395 int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); | |
| 396 #endif | |
| 397 if (MAP_FAILED == mmap(base, | |
| 398 size, | |
| 399 prot, | |
| 400 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, | |
| 401 kMmapFd, | |
| 402 kMmapFdOffset)) { | |
| 403 return false; | |
| 404 } | |
| 405 | |
| 406 return true; | |
| 407 } | |
| 408 | |
| 409 | |
| 410 bool VirtualMemory::UncommitRegion(void* base, size_t size) { | |
| 411 return mmap(base, | |
| 412 size, | |
| 413 PROT_NONE, | |
| 414 MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED, | |
| 415 kMmapFd, | |
| 416 kMmapFdOffset) != MAP_FAILED; | |
| 417 } | |
| 418 | |
| 419 | |
| 420 bool VirtualMemory::ReleaseRegion(void* base, size_t size) { | |
| 421 #if defined(LEAK_SANITIZER) | |
| 422 __lsan_unregister_root_region(base, size); | |
| 423 #endif | |
| 424 return munmap(base, size) == 0; | |
| 425 } | |
| 426 | |
| 427 | |
| 428 bool VirtualMemory::HasLazyCommits() { | |
| 429 return true; | |
| 430 } | |
| 431 | |
| 432 } } // namespace v8::internal | |
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Chromium Code Reviews
Issue 358363002:
Move platform abstraction to base library (Closed)
Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge