1/* 2 * Copyright (c) 1999, 2016, 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_LINUX_VM_OS_LINUX_HPP 26#define OS_LINUX_VM_OS_LINUX_HPP 27 28// Linux_OS defines the interface to Linux operating systems 29 30// Information about the protection of the page at address '0' on this os. 31static bool zero_page_read_protected() { return true; } 32 33class Linux { 34 friend class os; 35 friend class TestReserveMemorySpecial; 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 static int (*_clock_gettime)(clockid_t, struct timespec *); 46 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); 47 static int (*_pthread_setname_np)(pthread_t, const char*); 48 49 static address _initial_thread_stack_bottom; 50 static uintptr_t _initial_thread_stack_size; 51 52 static const char *_glibc_version; 53 static const char *_libpthread_version; 54 55 static bool _supports_fast_thread_cpu_time; 56 57 static GrowableArray<int>* _cpu_to_node; 58 59 // 0x00000000 = uninitialized, 60 // 0x01000000 = kernel version unknown, 61 // otherwise a 32-bit number: 62 // Ox00AABBCC 63 // AA, Major Version 64 // BB, Minor Version 65 // CC, Fix Version 66 static uint32_t _os_version; 67 68 protected: 69 70 static julong _physical_memory; 71 static pthread_t _main_thread; 72 static Mutex* _createThread_lock; 73 static int _page_size; 74 75 static julong available_memory(); 76 static julong physical_memory() { return _physical_memory; } 77 static void initialize_system_info(); 78 79 static int commit_memory_impl(char* addr, size_t bytes, bool exec); 80 static int commit_memory_impl(char* addr, size_t bytes, 81 size_t alignment_hint, bool exec); 82 83 static void set_glibc_version(const char *s) { _glibc_version = s; } 84 static void set_libpthread_version(const char *s) { _libpthread_version = s; } 85 86 static void rebuild_cpu_to_node_map(); 87 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 88 89 static size_t find_large_page_size(); 90 static size_t setup_large_page_size(); 91 92 static bool setup_large_page_type(size_t page_size); 93 static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size); 94 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 95 96 static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec); 97 static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec); 98 static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec); 99 static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec); 100 101 static bool release_memory_special_impl(char* base, size_t bytes); 102 static bool release_memory_special_shm(char* base, size_t bytes); 103 static bool release_memory_special_huge_tlbfs(char* base, size_t bytes); 104 105 static void print_full_memory_info(outputStream* st); 106 static void print_distro_info(outputStream* st); 107 static void print_libversion_info(outputStream* st); 108 109 public: 110 static bool _stack_is_executable; 111 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen); 112 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen); 113 114 static void init_thread_fpu_state(); 115 static int get_fpu_control_word(); 116 static void set_fpu_control_word(int fpu_control); 117 static pthread_t main_thread(void) { return _main_thread; } 118 // returns kernel thread id (similar to LWP id on Solaris), which can be 119 // used to access /proc 120 static pid_t gettid(); 121 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 122 static Mutex* createThread_lock(void) { return _createThread_lock; } 123 static void hotspot_sigmask(Thread* thread); 124 125 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } 126 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } 127 static bool is_initial_thread(void); 128 129 static int page_size(void) { return _page_size; } 130 static void set_page_size(int val) { _page_size = val; } 131 132 static address ucontext_get_pc(const ucontext_t* uc); 133 static void ucontext_set_pc(ucontext_t* uc, address pc); 134 static intptr_t* ucontext_get_sp(const ucontext_t* uc); 135 static intptr_t* ucontext_get_fp(const ucontext_t* uc); 136 137 // For Analyzer Forte AsyncGetCallTrace profiling support: 138 // 139 // This interface should be declared in os_linux_i486.hpp, but 140 // that file provides extensions to the os class and not the 141 // Linux class. 142 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, const ucontext_t* uc, 143 intptr_t** ret_sp, intptr_t** ret_fp); 144 145 static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr); 146 147 // This boolean allows users to forward their own non-matching signals 148 // to JVM_handle_linux_signal, harmlessly. 149 static bool signal_handlers_are_installed; 150 151 static int get_our_sigflags(int); 152 static void set_our_sigflags(int, int); 153 static void signal_sets_init(); 154 static void install_signal_handlers(); 155 static void set_signal_handler(int, bool); 156 static bool is_sig_ignored(int sig); 157 158 static sigset_t* unblocked_signals(); 159 static sigset_t* vm_signals(); 160 static sigset_t* allowdebug_blocked_signals(); 161 162 // For signal-chaining 163 static struct sigaction *get_chained_signal_action(int sig); 164 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 165 166 // GNU libc and libpthread version strings 167 static const char *glibc_version() { return _glibc_version; } 168 static const char *libpthread_version() { return _libpthread_version; } 169 170 static void libpthread_init(); 171 static bool libnuma_init(); 172 static void* libnuma_dlsym(void* handle, const char* name); 173 174 // Return default guard size for the specified thread type 175 static size_t default_guard_size(os::ThreadType thr_type); 176 177 static void capture_initial_stack(size_t max_size); 178 179 // Stack overflow handling 180 static bool manually_expand_stack(JavaThread * t, address addr); 181 static int max_register_window_saves_before_flushing(); 182 183 // Real-time clock functions 184 static void clock_init(void); 185 186 // fast POSIX clocks support 187 static void fast_thread_clock_init(void); 188 189 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { 190 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; 191 } 192 193 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { 194 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; 195 } 196 197 static bool supports_fast_thread_cpu_time() { 198 return _supports_fast_thread_cpu_time; 199 } 200 201 static jlong fast_thread_cpu_time(clockid_t clockid); 202 203 static void initialize_os_info(); 204 static bool os_version_is_known(); 205 static uint32_t os_version(); 206 207 // pthread_cond clock suppport 208 private: 209 static pthread_condattr_t _condattr[1]; 210 211 public: 212 static pthread_condattr_t* condAttr() { return _condattr; } 213 214 // Stack repair handling 215 216 // none present 217 218 private: 219 typedef int (*sched_getcpu_func_t)(void); 220 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 221 typedef int (*numa_max_node_func_t)(void); 222 typedef int (*numa_available_func_t)(void); 223 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 224 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 225 typedef void (*numa_set_bind_policy_func_t)(int policy); 226 227 static sched_getcpu_func_t _sched_getcpu; 228 static numa_node_to_cpus_func_t _numa_node_to_cpus; 229 static numa_max_node_func_t _numa_max_node; 230 static numa_available_func_t _numa_available; 231 static numa_tonode_memory_func_t _numa_tonode_memory; 232 static numa_interleave_memory_func_t _numa_interleave_memory; 233 static numa_set_bind_policy_func_t _numa_set_bind_policy; 234 static unsigned long* _numa_all_nodes; 235 236 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 237 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 238 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 239 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 240 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 241 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 242 static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; } 243 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 244 static int sched_getcpu_syscall(void); 245 public: 246 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 247 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 248 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 249 } 250 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 251 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 252 static int numa_tonode_memory(void *start, size_t size, int node) { 253 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 254 } 255 static void numa_interleave_memory(void *start, size_t size) { 256 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 257 _numa_interleave_memory(start, size, _numa_all_nodes); 258 } 259 } 260 static void numa_set_bind_policy(int policy) { 261 if (_numa_set_bind_policy != NULL) { 262 _numa_set_bind_policy(policy); 263 } 264 } 265 static int get_node_by_cpu(int cpu_id); 266}; 267 268 269class PlatformEvent : public CHeapObj<mtInternal> { 270 private: 271 double CachePad[4]; // increase odds that _mutex is sole occupant of cache line 272 volatile int _Event; 273 volatile int _nParked; 274 pthread_mutex_t _mutex[1]; 275 pthread_cond_t _cond[1]; 276 double PostPad[2]; 277 Thread * _Assoc; 278 279 public: // TODO-FIXME: make dtor private 280 ~PlatformEvent() { guarantee(0, "invariant"); } 281 282 public: 283 PlatformEvent() { 284 int status; 285 status = pthread_cond_init(_cond, os::Linux::condAttr()); 286 assert_status(status == 0, status, "cond_init"); 287 status = pthread_mutex_init(_mutex, NULL); 288 assert_status(status == 0, status, "mutex_init"); 289 _Event = 0; 290 _nParked = 0; 291 _Assoc = NULL; 292 } 293 294 // Use caution with reset() and fired() -- they may require MEMBARs 295 void reset() { _Event = 0; } 296 int fired() { return _Event; } 297 void park(); 298 void unpark(); 299 int park(jlong millis); // relative timed-wait only 300 void SetAssociation(Thread * a) { _Assoc = a; } 301}; 302 303class PlatformParker : public CHeapObj<mtInternal> { 304 protected: 305 enum { 306 REL_INDEX = 0, 307 ABS_INDEX = 1 308 }; 309 int _cur_index; // which cond is in use: -1, 0, 1 310 pthread_mutex_t _mutex[1]; 311 pthread_cond_t _cond[2]; // one for relative times and one for abs. 312 313 public: // TODO-FIXME: make dtor private 314 ~PlatformParker() { guarantee(0, "invariant"); } 315 316 public: 317 PlatformParker() { 318 int status; 319 status = pthread_cond_init(&_cond[REL_INDEX], os::Linux::condAttr()); 320 assert_status(status == 0, status, "cond_init rel"); 321 status = pthread_cond_init(&_cond[ABS_INDEX], NULL); 322 assert_status(status == 0, status, "cond_init abs"); 323 status = pthread_mutex_init(_mutex, NULL); 324 assert_status(status == 0, status, "mutex_init"); 325 _cur_index = -1; // mark as unused 326 } 327}; 328 329#endif // OS_LINUX_VM_OS_LINUX_HPP 330