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| 1 // Copyright 2013 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 QNX goes here. For the POSIX-compatible | |
| 6 // parts the implementation is in platform-posix.cc. | |
| 7 | |
| 8 #include <backtrace.h> | |
| 9 #include <pthread.h> | |
| 10 #include <semaphore.h> | |
| 11 #include <signal.h> | |
| 12 #include <stdlib.h> | |
| 13 #include <sys/resource.h> | |
| 14 #include <sys/time.h> | |
| 15 #include <sys/types.h> | |
| 16 #include <ucontext.h> | |
| 17 | |
| 18 // QNX requires memory pages to be marked as executable. | |
| 19 // Otherwise, the OS raises an exception when executing code in that page. | |
| 20 #include <errno.h> | |
| 21 #include <fcntl.h> // open | |
| 22 #include <stdarg.h> | |
| 23 #include <strings.h> // index | |
| 24 #include <sys/mman.h> // mmap & munmap | |
| 25 #include <sys/procfs.h> | |
| 26 #include <sys/stat.h> // open | |
| 27 #include <sys/types.h> // mmap & munmap | |
| 28 #include <unistd.h> // sysconf | |
| 29 | |
| 30 #include <cmath> | |
| 31 | |
| 32 #undef MAP_TYPE | |
| 33 | |
| 34 #include "src/platform.h" | |
| 35 #include "src/utils.h" | |
| 36 | |
| 37 | |
| 38 namespace v8 { | |
| 39 namespace internal { | |
| 40 | |
| 41 // 0 is never a valid thread id on Qnx since tids and pids share a | |
| 42 // name space and pid 0 is reserved (see man 2 kill). | |
| 43 static const pthread_t kNoThread = (pthread_t) 0; | |
| 44 | |
| 45 | |
| 46 #ifdef __arm__ | |
| 47 | |
| 48 bool OS::ArmUsingHardFloat() { | |
| 49 // GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify | |
| 50 // the Floating Point ABI used (PCS stands for Procedure Call Standard). | |
| 51 // We use these as well as a couple of other defines to statically determine | |
| 52 // what FP ABI used. | |
| 53 // GCC versions 4.4 and below don't support hard-fp. | |
| 54 // GCC versions 4.5 may support hard-fp without defining __ARM_PCS or | |
| 55 // __ARM_PCS_VFP. | |
| 56 | |
| 57 #define GCC_VERSION (__GNUC__ * 10000 \ | |
| 58 + __GNUC_MINOR__ * 100 \ | |
| 59 + __GNUC_PATCHLEVEL__) | |
| 60 #if GCC_VERSION >= 40600 | |
| 61 #if defined(__ARM_PCS_VFP) | |
| 62 return true; | |
| 63 #else | |
| 64 return false; | |
| 65 #endif | |
| 66 | |
| 67 #elif GCC_VERSION < 40500 | |
| 68 return false; | |
| 69 | |
| 70 #else | |
| 71 #if defined(__ARM_PCS_VFP) | |
| 72 return true; | |
| 73 #elif defined(__ARM_PCS) || defined(__SOFTFP__) || defined(__SOFTFP) || \ | |
| 74 !defined(__VFP_FP__) | |
| 75 return false; | |
| 76 #else | |
| 77 #error "Your version of GCC does not report the FP ABI compiled for." \ | |
| 78 "Please report it on this issue" \ | |
| 79 "http://code.google.com/p/v8/issues/detail?id=2140" | |
| 80 | |
| 81 #endif | |
| 82 #endif | |
| 83 #undef GCC_VERSION | |
| 84 } | |
| 85 | |
| 86 #endif // __arm__ | |
| 87 | |
| 88 | |
| 89 const char* OS::LocalTimezone(double time, TimezoneCache* cache) { | |
| 90 if (std::isnan(time)) return ""; | |
| 91 time_t tv = static_cast<time_t>(std::floor(time/msPerSecond)); | |
| 92 struct tm* t = localtime(&tv); | |
| 93 if (NULL == t) return ""; | |
| 94 return t->tm_zone; | |
| 95 } | |
| 96 | |
| 97 | |
| 98 double OS::LocalTimeOffset(TimezoneCache* cache) { | |
| 99 time_t tv = time(NULL); | |
| 100 struct tm* t = localtime(&tv); | |
| 101 // tm_gmtoff includes any daylight savings offset, so subtract it. | |
| 102 return static_cast<double>(t->tm_gmtoff * msPerSecond - | |
| 103 (t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); | |
| 104 } | |
| 105 | |
| 106 | |
| 107 void* OS::Allocate(const size_t requested, | |
| 108 size_t* allocated, | |
| 109 bool is_executable) { | |
| 110 const size_t msize = RoundUp(requested, AllocateAlignment()); | |
| 111 int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); | |
| 112 void* addr = OS::GetRandomMmapAddr(); | |
| 113 void* mbase = mmap(addr, msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
| 114 if (mbase == MAP_FAILED) return NULL; | |
| 115 *allocated = msize; | |
| 116 return mbase; | |
| 117 } | |
| 118 | |
| 119 | |
| 120 class PosixMemoryMappedFile : public OS::MemoryMappedFile { | |
| 121 public: | |
| 122 PosixMemoryMappedFile(FILE* file, void* memory, int size) | |
| 123 : file_(file), memory_(memory), size_(size) { } | |
| 124 virtual ~PosixMemoryMappedFile(); | |
| 125 virtual void* memory() { return memory_; } | |
| 126 virtual int size() { return size_; } | |
| 127 private: | |
| 128 FILE* file_; | |
| 129 void* memory_; | |
| 130 int size_; | |
| 131 }; | |
| 132 | |
| 133 | |
| 134 OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { | |
| 135 FILE* file = fopen(name, "r+"); | |
| 136 if (file == NULL) return NULL; | |
| 137 | |
| 138 fseek(file, 0, SEEK_END); | |
| 139 int size = ftell(file); | |
| 140 | |
| 141 void* memory = | |
| 142 mmap(OS::GetRandomMmapAddr(), | |
| 143 size, | |
| 144 PROT_READ | PROT_WRITE, | |
| 145 MAP_SHARED, | |
| 146 fileno(file), | |
| 147 0); | |
| 148 return new PosixMemoryMappedFile(file, memory, size); | |
| 149 } | |
| 150 | |
| 151 | |
| 152 OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, | |
| 153 void* initial) { | |
| 154 FILE* file = fopen(name, "w+"); | |
| 155 if (file == NULL) return NULL; | |
| 156 int result = fwrite(initial, size, 1, file); | |
| 157 if (result < 1) { | |
| 158 fclose(file); | |
| 159 return NULL; | |
| 160 } | |
| 161 void* memory = | |
| 162 mmap(OS::GetRandomMmapAddr(), | |
| 163 size, | |
| 164 PROT_READ | PROT_WRITE, | |
| 165 MAP_SHARED, | |
| 166 fileno(file), | |
| 167 0); | |
| 168 return new PosixMemoryMappedFile(file, memory, size); | |
| 169 } | |
| 170 | |
| 171 | |
| 172 PosixMemoryMappedFile::~PosixMemoryMappedFile() { | |
| 173 if (memory_) OS::Free(memory_, size_); | |
| 174 fclose(file_); | |
| 175 } | |
| 176 | |
| 177 | |
| 178 std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() { | |
| 179 std::vector<SharedLibraryAddress> result; | |
| 180 procfs_mapinfo *mapinfos = NULL, *mapinfo; | |
| 181 int proc_fd, num, i; | |
| 182 | |
| 183 struct { | |
| 184 procfs_debuginfo info; | |
| 185 char buff[PATH_MAX]; | |
| 186 } map; | |
| 187 | |
| 188 char buf[PATH_MAX + 1]; | |
| 189 snprintf(buf, PATH_MAX + 1, "/proc/%d/as", getpid()); | |
| 190 | |
| 191 if ((proc_fd = open(buf, O_RDONLY)) == -1) { | |
| 192 close(proc_fd); | |
| 193 return result; | |
| 194 } | |
| 195 | |
| 196 /* Get the number of map entries. */ | |
| 197 if (devctl(proc_fd, DCMD_PROC_MAPINFO, NULL, 0, &num) != EOK) { | |
| 198 close(proc_fd); | |
| 199 return result; | |
| 200 } | |
| 201 | |
| 202 mapinfos = reinterpret_cast<procfs_mapinfo *>( | |
| 203 malloc(num * sizeof(procfs_mapinfo))); | |
| 204 if (mapinfos == NULL) { | |
| 205 close(proc_fd); | |
| 206 return result; | |
| 207 } | |
| 208 | |
| 209 /* Fill the map entries. */ | |
| 210 if (devctl(proc_fd, DCMD_PROC_PAGEDATA, | |
| 211 mapinfos, num * sizeof(procfs_mapinfo), &num) != EOK) { | |
| 212 free(mapinfos); | |
| 213 close(proc_fd); | |
| 214 return result; | |
| 215 } | |
| 216 | |
| 217 for (i = 0; i < num; i++) { | |
| 218 mapinfo = mapinfos + i; | |
| 219 if (mapinfo->flags & MAP_ELF) { | |
| 220 map.info.vaddr = mapinfo->vaddr; | |
| 221 if (devctl(proc_fd, DCMD_PROC_MAPDEBUG, &map, sizeof(map), 0) != EOK) { | |
| 222 continue; | |
| 223 } | |
| 224 result.push_back(SharedLibraryAddress( | |
| 225 map.info.path, mapinfo->vaddr, mapinfo->vaddr + mapinfo->size)); | |
| 226 } | |
| 227 } | |
| 228 free(mapinfos); | |
| 229 close(proc_fd); | |
| 230 return result; | |
| 231 } | |
| 232 | |
| 233 | |
| 234 void OS::SignalCodeMovingGC() { | |
| 235 } | |
| 236 | |
| 237 | |
| 238 // Constants used for mmap. | |
| 239 static const int kMmapFd = -1; | |
| 240 static const int kMmapFdOffset = 0; | |
| 241 | |
| 242 | |
| 243 VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { } | |
| 244 | |
| 245 | |
| 246 VirtualMemory::VirtualMemory(size_t size) | |
| 247 : address_(ReserveRegion(size)), size_(size) { } | |
| 248 | |
| 249 | |
| 250 VirtualMemory::VirtualMemory(size_t size, size_t alignment) | |
| 251 : address_(NULL), size_(0) { | |
| 252 ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment()))); | |
| 253 size_t request_size = RoundUp(size + alignment, | |
| 254 static_cast<intptr_t>(OS::AllocateAlignment())); | |
| 255 void* reservation = mmap(OS::GetRandomMmapAddr(), | |
| 256 request_size, | |
| 257 PROT_NONE, | |
| 258 MAP_PRIVATE | MAP_ANONYMOUS | MAP_LAZY, | |
| 259 kMmapFd, | |
| 260 kMmapFdOffset); | |
| 261 if (reservation == MAP_FAILED) return; | |
| 262 | |
| 263 uint8_t* base = static_cast<uint8_t*>(reservation); | |
| 264 uint8_t* aligned_base = RoundUp(base, alignment); | |
| 265 ASSERT_LE(base, aligned_base); | |
| 266 | |
| 267 // Unmap extra memory reserved before and after the desired block. | |
| 268 if (aligned_base != base) { | |
| 269 size_t prefix_size = static_cast<size_t>(aligned_base - base); | |
| 270 OS::Free(base, prefix_size); | |
| 271 request_size -= prefix_size; | |
| 272 } | |
| 273 | |
| 274 size_t aligned_size = RoundUp(size, OS::AllocateAlignment()); | |
| 275 ASSERT_LE(aligned_size, request_size); | |
| 276 | |
| 277 if (aligned_size != request_size) { | |
| 278 size_t suffix_size = request_size - aligned_size; | |
| 279 OS::Free(aligned_base + aligned_size, suffix_size); | |
| 280 request_size -= suffix_size; | |
| 281 } | |
| 282 | |
| 283 ASSERT(aligned_size == request_size); | |
| 284 | |
| 285 address_ = static_cast<void*>(aligned_base); | |
| 286 size_ = aligned_size; | |
| 287 } | |
| 288 | |
| 289 | |
| 290 VirtualMemory::~VirtualMemory() { | |
| 291 if (IsReserved()) { | |
| 292 bool result = ReleaseRegion(address(), size()); | |
| 293 ASSERT(result); | |
| 294 USE(result); | |
| 295 } | |
| 296 } | |
| 297 | |
| 298 | |
| 299 bool VirtualMemory::IsReserved() { | |
| 300 return address_ != NULL; | |
| 301 } | |
| 302 | |
| 303 | |
| 304 void VirtualMemory::Reset() { | |
| 305 address_ = NULL; | |
| 306 size_ = 0; | |
| 307 } | |
| 308 | |
| 309 | |
| 310 bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { | |
| 311 return CommitRegion(address, size, is_executable); | |
| 312 } | |
| 313 | |
| 314 | |
| 315 bool VirtualMemory::Uncommit(void* address, size_t size) { | |
| 316 return UncommitRegion(address, size); | |
| 317 } | |
| 318 | |
| 319 | |
| 320 bool VirtualMemory::Guard(void* address) { | |
| 321 OS::Guard(address, OS::CommitPageSize()); | |
| 322 return true; | |
| 323 } | |
| 324 | |
| 325 | |
| 326 void* VirtualMemory::ReserveRegion(size_t size) { | |
| 327 void* result = mmap(OS::GetRandomMmapAddr(), | |
| 328 size, | |
| 329 PROT_NONE, | |
| 330 MAP_PRIVATE | MAP_ANONYMOUS | MAP_LAZY, | |
| 331 kMmapFd, | |
| 332 kMmapFdOffset); | |
| 333 | |
| 334 if (result == MAP_FAILED) return NULL; | |
| 335 | |
| 336 return result; | |
| 337 } | |
| 338 | |
| 339 | |
| 340 bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { | |
| 341 int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); | |
| 342 if (MAP_FAILED == mmap(base, | |
| 343 size, | |
| 344 prot, | |
| 345 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, | |
| 346 kMmapFd, | |
| 347 kMmapFdOffset)) { | |
| 348 return false; | |
| 349 } | |
| 350 | |
| 351 return true; | |
| 352 } | |
| 353 | |
| 354 | |
| 355 bool VirtualMemory::UncommitRegion(void* base, size_t size) { | |
| 356 return mmap(base, | |
| 357 size, | |
| 358 PROT_NONE, | |
| 359 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED | MAP_LAZY, | |
| 360 kMmapFd, | |
| 361 kMmapFdOffset) != MAP_FAILED; | |
| 362 } | |
| 363 | |
| 364 | |
| 365 bool VirtualMemory::ReleaseRegion(void* base, size_t size) { | |
| 366 return munmap(base, size) == 0; | |
| 367 } | |
| 368 | |
| 369 | |
| 370 bool VirtualMemory::HasLazyCommits() { | |
| 371 return false; | |
| 372 } | |
| 373 | |
| 374 } } // 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