1 /* 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2013 SAP AG. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef OS_AIX_VM_OS_AIX_HPP 27 #define OS_AIX_VM_OS_AIX_HPP 28 29 // Information about the protection of the page at address '0' on this os. 30 static bool zero_page_read_protected() { return false; } 31 32 // Class Aix defines the interface to the Aix operating systems. 33 34 class Aix { 35 friend class os; 36 37 // For signal-chaining 38 // highest so far (AIX 5.2) is SIGSAK (63) 39 #define MAXSIGNUM 63 40 // length of strings included in the libperfstat structures 41 #define IDENTIFIER_LENGTH 64 42 43 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions 44 static unsigned int sigs; // mask of signals that have 45 // preinstalled signal handlers 46 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 47 // __sigaction(), signal() is loaded 48 static struct sigaction *(*get_signal_action)(int); 49 static struct sigaction *get_preinstalled_handler(int); 50 static void save_preinstalled_handler(int, struct sigaction&); 51 52 static void check_signal_handler(int sig); 53 54 // For signal flags diagnostics 55 static int sigflags[MAXSIGNUM]; 56 57 protected: 58 59 static julong _physical_memory; 60 static pthread_t _main_thread; 61 static Mutex* _createThread_lock; 62 static int _page_size; 63 static int _logical_cpus; 64 65 // -1 = uninitialized, 0 = AIX, 1 = OS/400 (PASE) 66 static int _on_pase; 67 68 // -1 = uninitialized, otherwise 16 bit number: 69 // lower 8 bit - minor version 70 // higher 8 bit - major version 71 // For AIX, e.g. 0x0601 for AIX 6.1 72 // for OS/400 e.g. 0x0504 for OS/400 V5R4 73 static int _os_version; 74 75 // -1 = uninitialized, 76 // 0 - SPEC1170 not requested (XPG_SUS_ENV is OFF or not set) 77 // 1 - SPEC1170 requested (XPG_SUS_ENV is ON) 78 static int _xpg_sus_mode; 79 80 // -1 = uninitialized, 81 // 0 - EXTSHM=OFF or not set 82 // 1 - EXTSHM=ON 83 static int _extshm; 84 85 // page sizes on AIX. 86 // 87 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The latter two 88 // (16M "large" resp. 16G "huge" pages) require special setup and are normally 89 // not available. 90 // 91 // AIX supports multiple page sizes per process, for: 92 // - Stack (of the primordial thread, so not relevant for us) 93 // - Data - data, bss, heap, for us also pthread stacks 94 // - Text - text code 95 // - shared memory 96 // 97 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...) 98 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...) 99 // 100 // For shared memory, page size can be set dynamically via shmctl(). Different shared memory 101 // regions can have different page sizes. 102 // 103 // More information can be found at AIBM info center: 104 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm 105 // 106 // ----- 107 // We want to support 4K and 64K and, if the machine is set up correctly, 16MB pages. 108 // 109 110 // page size of the stack of newly created pthreads 111 // (should be LDR_CNTRL DATAPSIZE because stack is allocated on heap by pthread lib) 112 static int _stack_page_size; 113 114 // Default shm page size. Read: what page size shared memory will be backed 115 // with if no page size was set explicitly using shmctl(SHM_PAGESIZE). 116 // Should be LDR_CNTRL SHMPSIZE. 117 static size_t _shm_default_page_size; 118 119 // True if sys V shm can be used with 64K pages dynamically. 120 // (via shmctl(.. SHM_PAGESIZE..). Should be true for AIX 53 and 121 // newer / PASE V6R1 and newer. (0 or 1, -1 if not initialized) 122 static int _can_use_64K_pages; 123 124 // True if sys V shm can be used with 16M pages dynamically. 125 // (via shmctl(.. SHM_PAGESIZE..). Only true on AIX 5.3 and 126 // newer, if the system was set up to use 16M pages and the 127 // jvm has enough user rights. (0 or 1, -1 if not initialized) 128 static int _can_use_16M_pages; 129 130 static julong available_memory(); 131 static julong physical_memory() { return _physical_memory; } 132 static void initialize_system_info(); 133 134 // OS recognitions (PASE/AIX, OS level) call this before calling any 135 // one of Aix::on_pase(), Aix::os_version(). 136 static void initialize_os_info(); 137 138 static int commit_memory_impl(char* addr, size_t bytes, bool exec); 139 static int commit_memory_impl(char* addr, size_t bytes, 140 size_t alignment_hint, bool exec); 141 142 // Scan environment for important settings which might effect the 143 // VM. Trace out settings. Warn about invalid settings and/or 144 // correct them. 145 // 146 // Must run after os::Aix::initialue_os_info(). 147 static void scan_environment(); 148 149 // Retrieve information about multipage size support. Will initialize 150 // _page_size, _stack_page_size, _can_use_64K_pages/_can_use_16M_pages 151 static void query_multipage_support(); 152 153 // Initialize libo4 (on PASE) and libperfstat (on AIX). Call this 154 // before relying on functions from either lib, e.g. Aix::get_meminfo(). 155 static void initialize_libo4(); 156 static void initialize_libperfstat(); 157 158 static bool supports_variable_stack_size(); 159 160 public: 161 static void init_thread_fpu_state(); 162 static pthread_t main_thread(void) { return _main_thread; } 163 // returns kernel thread id (similar to LWP id on Solaris), which can be 164 // used to access /proc 165 static pid_t gettid(); 166 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 167 static Mutex* createThread_lock(void) { return _createThread_lock; } 168 static void hotspot_sigmask(Thread* thread); 169 170 // Given an address, returns the size of the page backing that address 171 static size_t query_pagesize(void* p); 172 173 // Return `true' if the calling thread is the primordial thread. The 174 // primordial thread is the thread which contains the main function, 175 // *not* necessarily the thread which initialized the VM by calling 176 // JNI_CreateJavaVM. 177 static bool is_primordial_thread(void); 178 179 static int page_size(void) { 180 assert(_page_size != -1, "not initialized"); 181 return _page_size; 182 } 183 184 // Accessor methods for stack page size which may be different from usual page size. 185 static int stack_page_size(void) { 186 assert(_stack_page_size != -1, "not initialized"); 187 return _stack_page_size; 188 } 189 190 // default shm page size. Read: what page size shared memory 191 // will be backed with if no page size was set explicitly using shmctl(SHM_PAGESIZE). 192 // Should be LDR_CNTRL SHMPSIZE. 193 static int shm_default_page_size(void) { 194 assert(_shm_default_page_size != -1, "not initialized"); 195 return _shm_default_page_size; 196 } 197 198 // Return true if sys V shm can be used with 64K pages dynamically 199 // (via shmctl(.. SHM_PAGESIZE..). 200 static bool can_use_64K_pages () { 201 assert(_can_use_64K_pages != -1, "not initialized"); 202 return _can_use_64K_pages == 1 ? true : false; 203 } 204 205 // Return true if sys V shm can be used with 16M pages dynamically. 206 // (via shmctl(.. SHM_PAGESIZE..). 207 static bool can_use_16M_pages () { 208 assert(_can_use_16M_pages != -1, "not initialized"); 209 return _can_use_16M_pages == 1 ? true : false; 210 } 211 212 static address ucontext_get_pc(const ucontext_t* uc); 213 static intptr_t* ucontext_get_sp(ucontext_t* uc); 214 static intptr_t* ucontext_get_fp(ucontext_t* uc); 215 // Set PC into context. Needed for continuation after signal. 216 static void ucontext_set_pc(ucontext_t* uc, address pc); 217 218 // This boolean allows users to forward their own non-matching signals 219 // to JVM_handle_aix_signal, harmlessly. 220 static bool signal_handlers_are_installed; 221 222 static int get_our_sigflags(int); 223 static void set_our_sigflags(int, int); 224 static void signal_sets_init(); 225 static void install_signal_handlers(); 226 static void set_signal_handler(int, bool); 227 static bool is_sig_ignored(int sig); 228 229 static sigset_t* unblocked_signals(); 230 static sigset_t* vm_signals(); 231 static sigset_t* allowdebug_blocked_signals(); 232 233 // For signal-chaining 234 static struct sigaction *get_chained_signal_action(int sig); 235 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 236 237 // libpthread version string 238 static void libpthread_init(); 239 240 // Minimum stack size a thread can be created with (allowing 241 // the VM to completely create the thread and enter user code) 242 static size_t min_stack_allowed; 243 244 // Return default stack size or guard size for the specified thread type 245 static size_t default_stack_size(os::ThreadType thr_type); 246 static size_t default_guard_size(os::ThreadType thr_type); 247 248 // Function returns true if we run on OS/400 (pase), false if we run 249 // on AIX. 250 static bool on_pase() { 251 assert(_on_pase != -1, "not initialized"); 252 return _on_pase ? true : false; 253 } 254 255 // Function returns true if we run on AIX, false if we run on OS/400 256 // (pase). 257 static bool on_aix() { 258 assert(_on_pase != -1, "not initialized"); 259 return _on_pase ? false : true; 260 } 261 262 // -1 = uninitialized, otherwise 16 bit number: 263 // lower 8 bit - minor version 264 // higher 8 bit - major version 265 // For AIX, e.g. 0x0601 for AIX 6.1 266 // for OS/400 e.g. 0x0504 for OS/400 V5R4 267 static int os_version () { 268 assert(_os_version != -1, "not initialized"); 269 return _os_version; 270 } 271 272 // Convenience method: returns true if running on AIX 5.3 or older. 273 static bool on_aix_53_or_older() { 274 return on_aix() && os_version() <= 0x0503; 275 } 276 277 // Returns true if we run in SPEC1170 compliant mode (XPG_SUS_ENV=ON). 278 static bool xpg_sus_mode() { 279 assert(_xpg_sus_mode != -1, "not initialized"); 280 return _xpg_sus_mode; 281 } 282 283 // Returns true if EXTSHM=ON. 284 static bool extshm() { 285 assert(_extshm != -1, "not initialized"); 286 return _extshm; 287 } 288 289 // result struct for get_meminfo() 290 struct meminfo_t { 291 292 // Amount of virtual memory (in units of 4 KB pages) 293 unsigned long long virt_total; 294 295 // Amount of real memory, in bytes 296 unsigned long long real_total; 297 298 // Amount of free real memory, in bytes 299 unsigned long long real_free; 300 301 // Total amount of paging space, in bytes 302 unsigned long long pgsp_total; 303 304 // Amount of free paging space, in bytes 305 unsigned long long pgsp_free; 306 307 }; 308 309 // Result struct for get_cpuinfo(). 310 struct cpuinfo_t { 311 char description[IDENTIFIER_LENGTH]; // processor description (type/official name) 312 u_longlong_t processorHZ; // processor speed in Hz 313 int ncpus; // number of active logical processors 314 double loadavg[3]; // (1<<SBITS) times the average number of runnables processes during the last 1, 5 and 15 minutes. 315 // To calculate the load average, divide the numbers by (1<<SBITS). SBITS is defined in <sys/proc.h>. 316 char version[20]; // processor version from _system_configuration (sys/systemcfg.h) 317 }; 318 319 // Functions to retrieve memory information on AIX, PASE. 320 // (on AIX, using libperfstat, on PASE with libo4.so). 321 // Returns true if ok, false if error. 322 static bool get_meminfo(meminfo_t* pmi); 323 324 // Function to retrieve cpu information on AIX 325 // (on AIX, using libperfstat) 326 // Returns true if ok, false if error. 327 static bool get_cpuinfo(cpuinfo_t* pci); 328 329 }; // os::Aix class 330 331 332 class PlatformEvent : public CHeapObj<mtInternal> { 333 private: 334 double CachePad [4]; // increase odds that _mutex is sole occupant of cache line 335 volatile int _Event; 336 volatile int _nParked; 337 pthread_mutex_t _mutex [1]; 338 pthread_cond_t _cond [1]; 339 double PostPad [2]; 340 Thread * _Assoc; 341 342 public: // TODO-FIXME: make dtor private 343 ~PlatformEvent() { guarantee (0, "invariant"); } 344 345 public: 346 PlatformEvent() { 347 int status; 348 status = pthread_cond_init (_cond, NULL); 349 assert_status(status == 0, status, "cond_init"); 350 status = pthread_mutex_init (_mutex, NULL); 351 assert_status(status == 0, status, "mutex_init"); 352 _Event = 0; 353 _nParked = 0; 354 _Assoc = NULL; 355 } 356 357 // Use caution with reset() and fired() -- they may require MEMBARs 358 void reset() { _Event = 0; } 359 int fired() { return _Event; } 360 void park (); 361 void unpark (); 362 int TryPark (); 363 int park (jlong millis); 364 void SetAssociation (Thread * a) { _Assoc = a; } 365 }; 366 367 class PlatformParker : public CHeapObj<mtInternal> { 368 protected: 369 pthread_mutex_t _mutex [1]; 370 pthread_cond_t _cond [1]; 371 372 public: // TODO-FIXME: make dtor private 373 ~PlatformParker() { guarantee (0, "invariant"); } 374 375 public: 376 PlatformParker() { 377 int status; 378 status = pthread_cond_init (_cond, NULL); 379 assert_status(status == 0, status, "cond_init"); 380 status = pthread_mutex_init (_mutex, NULL); 381 assert_status(status == 0, status, "mutex_init"); 382 } 383 }; 384 385 #endif // OS_AIX_VM_OS_AIX_HPP