1 /* 2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2013, 2016 SAP SE. 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 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 38 // __sigaction(), signal() is loaded 39 static struct sigaction *(*get_signal_action)(int); 40 static struct sigaction *get_preinstalled_handler(int); 41 static void save_preinstalled_handler(int, struct sigaction&); 42 43 static void check_signal_handler(int sig); 44 45 private: 46 47 static julong _physical_memory; 48 static pthread_t _main_thread; 49 static Mutex* _createThread_lock; 50 static int _page_size; 51 52 // -1 = uninitialized, 0 = AIX, 1 = OS/400 (PASE) 53 static int _on_pase; 54 55 // 0 = uninitialized, otherwise 16 bit number: 56 // lower 8 bit - minor version 57 // higher 8 bit - major version 58 // For AIX, e.g. 0x0601 for AIX 6.1 59 // for OS/400 e.g. 0x0504 for OS/400 V5R4 60 static uint32_t _os_version; 61 62 // -1 = uninitialized, 63 // 0 - SPEC1170 not requested (XPG_SUS_ENV is OFF or not set) 64 // 1 - SPEC1170 requested (XPG_SUS_ENV is ON) 65 static int _xpg_sus_mode; 66 67 // -1 = uninitialized, 68 // 0 - EXTSHM=OFF or not set 69 // 1 - EXTSHM=ON 70 static int _extshm; 71 72 static julong available_memory(); 73 static julong physical_memory() { return _physical_memory; } 74 static void initialize_system_info(); 75 76 // OS recognitions (PASE/AIX, OS level) call this before calling any 77 // one of Aix::on_pase(), Aix::os_version(). 78 static void initialize_os_info(); 79 80 // Scan environment for important settings which might effect the 81 // VM. Trace out settings. Warn about invalid settings and/or 82 // correct them. 83 // 84 // Must run after os::Aix::initialue_os_info(). 85 static void scan_environment(); 86 87 // Initialize libo4 (on PASE) and libperfstat (on AIX). Call this 88 // before relying on functions from either lib, e.g. Aix::get_meminfo(). 89 static void initialize_libo4(); 90 static void initialize_libperfstat(); 91 92 public: 93 static void init_thread_fpu_state(); 94 static pthread_t main_thread(void) { return _main_thread; } 95 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 96 static Mutex* createThread_lock(void) { return _createThread_lock; } 97 static void hotspot_sigmask(Thread* thread); 98 99 // Given an address, returns the size of the page backing that address 100 static size_t query_pagesize(void* p); 101 102 // Return `true' if the calling thread is the primordial thread. The 103 // primordial thread is the thread which contains the main function, 104 // *not* necessarily the thread which initialized the VM by calling 105 // JNI_CreateJavaVM. 106 static bool is_primordial_thread(void); 107 108 static int page_size(void) { 109 assert(_page_size != -1, "not initialized"); 110 return _page_size; 111 } 112 113 static address ucontext_get_pc(const ucontext_t* uc); 114 static intptr_t* ucontext_get_sp(const ucontext_t* uc); 115 static intptr_t* ucontext_get_fp(const ucontext_t* uc); 116 // Set PC into context. Needed for continuation after signal. 117 static void ucontext_set_pc(ucontext_t* uc, address pc); 118 119 static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr); 120 121 // This boolean allows users to forward their own non-matching signals 122 // to JVM_handle_aix_signal, harmlessly. 123 static bool signal_handlers_are_installed; 124 125 static int get_our_sigflags(int); 126 static void set_our_sigflags(int, int); 127 static void signal_sets_init(); 128 static void install_signal_handlers(); 129 static void set_signal_handler(int, bool); 130 static bool is_sig_ignored(int sig); 131 132 static sigset_t* unblocked_signals(); 133 static sigset_t* vm_signals(); 134 static sigset_t* allowdebug_blocked_signals(); 135 136 // For signal-chaining 137 static struct sigaction *get_chained_signal_action(int sig); 138 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 139 140 // libpthread version string 141 static void libpthread_init(); 142 143 // Minimum stack size a thread can be created with (allowing 144 // the VM to completely create the thread and enter user code) 145 static size_t min_stack_allowed; 146 147 // Return default stack size or guard size for the specified thread type 148 static size_t default_stack_size(os::ThreadType thr_type); 149 static size_t default_guard_size(os::ThreadType thr_type); 150 151 // Function returns true if we run on OS/400 (pase), false if we run 152 // on AIX. 153 static bool on_pase() { 154 assert(_on_pase != -1, "not initialized"); 155 return _on_pase ? true : false; 156 } 157 158 // Function returns true if we run on AIX, false if we run on OS/400 159 // (pase). 160 static bool on_aix() { 161 assert(_on_pase != -1, "not initialized"); 162 return _on_pase ? false : true; 163 } 164 165 // Get 4 byte AIX kernel version number: 166 // highest 2 bytes: Version, Release 167 // if available: lowest 2 bytes: Tech Level, Service Pack. 168 static uint32_t os_version() { 169 assert(_os_version != 0, "not initialized"); 170 return _os_version; 171 } 172 173 // 0 = uninitialized, otherwise 16 bit number: 174 // lower 8 bit - minor version 175 // higher 8 bit - major version 176 // For AIX, e.g. 0x0601 for AIX 6.1 177 // for OS/400 e.g. 0x0504 for OS/400 V5R4 178 static int os_version_short() { 179 return os_version() >> 16; 180 } 181 182 // Convenience method: returns true if running on PASE V5R4 or older. 183 static bool on_pase_V5R4_or_older() { 184 return on_pase() && os_version_short() <= 0x0504; 185 } 186 187 // Convenience method: returns true if running on AIX 5.3 or older. 188 static bool on_aix_53_or_older() { 189 return on_aix() && os_version_short() <= 0x0503; 190 } 191 192 // Returns true if we run in SPEC1170 compliant mode (XPG_SUS_ENV=ON). 193 static bool xpg_sus_mode() { 194 assert(_xpg_sus_mode != -1, "not initialized"); 195 return _xpg_sus_mode; 196 } 197 198 // Returns true if EXTSHM=ON. 199 static bool extshm() { 200 assert(_extshm != -1, "not initialized"); 201 return _extshm; 202 } 203 204 // result struct for get_meminfo() 205 struct meminfo_t { 206 207 // Amount of virtual memory (in units of 4 KB pages) 208 unsigned long long virt_total; 209 210 // Amount of real memory, in bytes 211 unsigned long long real_total; 212 213 // Amount of free real memory, in bytes 214 unsigned long long real_free; 215 216 // Total amount of paging space, in bytes 217 unsigned long long pgsp_total; 218 219 // Amount of free paging space, in bytes 220 unsigned long long pgsp_free; 221 222 }; 223 224 // Functions to retrieve memory information on AIX, PASE. 225 // (on AIX, using libperfstat, on PASE with libo4.so). 226 // Returns true if ok, false if error. 227 static bool get_meminfo(meminfo_t* pmi); 228 229 }; 230 231 232 class PlatformEvent : public CHeapObj<mtInternal> { 233 private: 234 double CachePad [4]; // increase odds that _mutex is sole occupant of cache line 235 volatile int _Event; 236 volatile int _nParked; 237 pthread_mutex_t _mutex [1]; 238 pthread_cond_t _cond [1]; 239 double PostPad [2]; 240 Thread * _Assoc; 241 242 public: // TODO-FIXME: make dtor private 243 ~PlatformEvent() { guarantee (0, "invariant"); } 244 245 public: 246 PlatformEvent() { 247 int status; 248 status = pthread_cond_init (_cond, NULL); 249 assert_status(status == 0, status, "cond_init"); 250 status = pthread_mutex_init (_mutex, NULL); 251 assert_status(status == 0, status, "mutex_init"); 252 _Event = 0; 253 _nParked = 0; 254 _Assoc = NULL; 255 } 256 257 // Use caution with reset() and fired() -- they may require MEMBARs 258 void reset() { _Event = 0; } 259 int fired() { return _Event; } 260 void park (); 261 void unpark (); 262 int TryPark (); 263 int park (jlong millis); 264 void SetAssociation (Thread * a) { _Assoc = a; } 265 }; 266 267 class PlatformParker : public CHeapObj<mtInternal> { 268 protected: 269 pthread_mutex_t _mutex [1]; 270 pthread_cond_t _cond [1]; 271 272 public: // TODO-FIXME: make dtor private 273 ~PlatformParker() { guarantee (0, "invariant"); } 274 275 public: 276 PlatformParker() { 277 int status; 278 status = pthread_cond_init (_cond, NULL); 279 assert_status(status == 0, status, "cond_init"); 280 status = pthread_mutex_init (_mutex, NULL); 281 assert_status(status == 0, status, "mutex_init"); 282 } 283 }; 284 285 #endif // OS_AIX_VM_OS_AIX_HPP