1 /* 2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef OS_BSD_VM_OS_BSD_HPP 26 #define OS_BSD_VM_OS_BSD_HPP 27 28 // Bsd_OS defines the interface to Bsd operating systems 29 30 // Information about the protection of the page at address '0' on this os. 31 static bool zero_page_read_protected() { return true; } 32 33 /* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */ 34 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); 35 36 #ifdef __APPLE__ 37 // Mac OS X doesn't support clock_gettime. Stub out the type, it is 38 // unused 39 typedef int clockid_t; 40 #endif 41 42 class Bsd { 43 friend class os; 44 45 // For signal-chaining 46 #define MAXSIGNUM 32 47 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions 48 static unsigned int sigs; // mask of signals that have 49 // preinstalled signal handlers 50 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 51 // __sigaction(), signal() is loaded 52 static struct sigaction *(*get_signal_action)(int); 53 static struct sigaction *get_preinstalled_handler(int); 54 static void save_preinstalled_handler(int, struct sigaction&); 55 56 static void check_signal_handler(int sig); 57 58 // For signal flags diagnostics 59 static int sigflags[MAXSIGNUM]; 60 61 #ifdef __APPLE__ 62 // mach_absolute_time 63 static mach_timebase_info_data_t _timebase_info; 64 static volatile uint64_t _max_abstime; 65 #else 66 static int (*_clock_gettime)(clockid_t, struct timespec *); 67 #endif 68 69 static GrowableArray<int>* _cpu_to_node; 70 71 protected: 72 73 static julong _physical_memory; 74 static pthread_t _main_thread; 75 static int _page_size; 76 77 static julong available_memory(); 78 static julong physical_memory() { return _physical_memory; } 79 static void initialize_system_info(); 80 81 static bool supports_variable_stack_size(); 82 83 static void rebuild_cpu_to_node_map(); 84 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 85 86 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 87 88 public: 89 90 static void init_thread_fpu_state(); 91 static pthread_t main_thread(void) { return _main_thread; } 92 93 static void hotspot_sigmask(Thread* thread); 94 95 static pid_t gettid(); 96 97 static int page_size(void) { return _page_size; } 98 static void set_page_size(int val) { _page_size = val; } 99 100 static address ucontext_get_pc(ucontext_t* uc); 101 static intptr_t* ucontext_get_sp(ucontext_t* uc); 102 static intptr_t* ucontext_get_fp(ucontext_t* uc); 103 104 // For Analyzer Forte AsyncGetCallTrace profiling support: 105 // 106 // This interface should be declared in os_bsd_i486.hpp, but 107 // that file provides extensions to the os class and not the 108 // Bsd class. 109 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, 110 intptr_t** ret_sp, intptr_t** ret_fp); 111 112 // This boolean allows users to forward their own non-matching signals 113 // to JVM_handle_bsd_signal, harmlessly. 114 static bool signal_handlers_are_installed; 115 116 static int get_our_sigflags(int); 117 static void set_our_sigflags(int, int); 118 static void signal_sets_init(); 119 static void install_signal_handlers(); 120 static void set_signal_handler(int, bool); 121 static bool is_sig_ignored(int sig); 122 123 static sigset_t* unblocked_signals(); 124 static sigset_t* vm_signals(); 125 static sigset_t* allowdebug_blocked_signals(); 126 127 // For signal-chaining 128 static struct sigaction *get_chained_signal_action(int sig); 129 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 130 131 // Minimum stack size a thread can be created with (allowing 132 // the VM to completely create the thread and enter user code) 133 static size_t min_stack_allowed; 134 135 // Return default stack size or guard size for the specified thread type 136 static size_t default_stack_size(os::ThreadType thr_type); 137 static size_t default_guard_size(os::ThreadType thr_type); 138 139 // Real-time clock functions 140 static void clock_init(void); 141 142 static inline bool supports_monotonic_clock() { 143 #ifdef __APPLE__ 144 return true; 145 #else 146 return _clock_gettime != NULL; 147 #endif 148 } 149 150 // Stack repair handling 151 152 // none present 153 154 // BsdThreads work-around for 6292965 155 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); 156 157 private: 158 typedef int (*sched_getcpu_func_t)(void); 159 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 160 typedef int (*numa_max_node_func_t)(void); 161 typedef int (*numa_available_func_t)(void); 162 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 163 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 164 165 static sched_getcpu_func_t _sched_getcpu; 166 static numa_node_to_cpus_func_t _numa_node_to_cpus; 167 static numa_max_node_func_t _numa_max_node; 168 static numa_available_func_t _numa_available; 169 static numa_tonode_memory_func_t _numa_tonode_memory; 170 static numa_interleave_memory_func_t _numa_interleave_memory; 171 static unsigned long* _numa_all_nodes; 172 173 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 174 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 175 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 176 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 177 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 178 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 179 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 180 public: 181 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 182 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 183 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 184 } 185 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 186 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 187 static int numa_tonode_memory(void *start, size_t size, int node) { 188 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 189 } 190 static void numa_interleave_memory(void *start, size_t size) { 191 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 192 _numa_interleave_memory(start, size, _numa_all_nodes); 193 } 194 } 195 static int get_node_by_cpu(int cpu_id); 196 }; 197 198 199 class PlatformEvent : public CHeapObj<mtInternal> { 200 private: 201 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line 202 volatile int _Event ; 203 volatile int _nParked ; 204 pthread_mutex_t _mutex [1] ; 205 pthread_cond_t _cond [1] ; 206 double PostPad [2] ; 207 Thread * _Assoc ; 208 209 public: // TODO-FIXME: make dtor private 210 ~PlatformEvent() { guarantee (0, "invariant") ; } 211 212 public: 213 PlatformEvent() { 214 int status; 215 status = pthread_cond_init (_cond, NULL); 216 assert_status(status == 0, status, "cond_init"); 217 status = pthread_mutex_init (_mutex, NULL); 218 assert_status(status == 0, status, "mutex_init"); 219 _Event = 0 ; 220 _nParked = 0 ; 221 _Assoc = NULL ; 222 } 223 224 // Use caution with reset() and fired() -- they may require MEMBARs 225 void reset() { _Event = 0 ; } 226 int fired() { return _Event; } 227 void park () ; 228 void unpark () ; 229 int TryPark () ; 230 int park (jlong millis) ; 231 void SetAssociation (Thread * a) { _Assoc = a ; } 232 }; 233 234 class PlatformParker : public CHeapObj<mtInternal> { 235 protected: 236 pthread_mutex_t _mutex [1] ; 237 pthread_cond_t _cond [1] ; 238 239 public: // TODO-FIXME: make dtor private 240 ~PlatformParker() { guarantee (0, "invariant") ; } 241 242 public: 243 PlatformParker() { 244 int status; 245 status = pthread_cond_init (_cond, NULL); 246 assert_status(status == 0, status, "cond_init"); 247 status = pthread_mutex_init (_mutex, NULL); 248 assert_status(status == 0, status, "mutex_init"); 249 } 250 }; 251 252 #endif // OS_BSD_VM_OS_BSD_HPP