1 /*
2 * Copyright (c) 1999, 2015, 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 #ifdef __APPLE__
34 // Mac OS X doesn't support clock_gettime. Stub out the type, it is
35 // unused
36 typedef int clockid_t;
37 #endif
38
39 class Bsd {
40 friend class os;
41
42 // For signal-chaining
43 #define MAXSIGNUM 32
44 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
45 static unsigned int sigs; // mask of signals that have
46 // preinstalled signal handlers
47 static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
48 // __sigaction(), signal() is loaded
49 static struct sigaction *(*get_signal_action)(int);
50 static struct sigaction *get_preinstalled_handler(int);
51 static void save_preinstalled_handler(int, struct sigaction&);
52
53 static void check_signal_handler(int sig);
54
55 // For signal flags diagnostics
56 static int sigflags[MAXSIGNUM];
57
58 #ifdef __APPLE__
59 // mach_absolute_time
60 static mach_timebase_info_data_t _timebase_info;
61 static volatile uint64_t _max_abstime;
62 #else
63 static int (*_clock_gettime)(clockid_t, struct timespec *);
64 #endif
65
66 static GrowableArray<int>* _cpu_to_node;
67
68 protected:
69
70 static julong _physical_memory;
71 static pthread_t _main_thread;
72 static int _page_size;
73
74 static julong available_memory();
75 static julong physical_memory() { return _physical_memory; }
76 static void initialize_system_info();
77
78 static void rebuild_cpu_to_node_map();
79 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
80
81 static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
82
83 public:
84
85 static void init_thread_fpu_state();
86 static pthread_t main_thread(void) { return _main_thread; }
87
88 static void hotspot_sigmask(Thread* thread);
89
90 static bool is_initial_thread(void);
91 static pid_t gettid();
92
93 static int page_size(void) { return _page_size; }
94 static void set_page_size(int val) { _page_size = val; }
95
96 static address ucontext_get_pc(ucontext_t* uc);
97 static void ucontext_set_pc(ucontext_t* uc, address pc);
98 static intptr_t* ucontext_get_sp(ucontext_t* uc);
99 static intptr_t* ucontext_get_fp(ucontext_t* uc);
100
101 // For Analyzer Forte AsyncGetCallTrace profiling support:
102 //
103 // This interface should be declared in os_bsd_i486.hpp, but
104 // that file provides extensions to the os class and not the
105 // Bsd class.
106 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
107 intptr_t** ret_sp, intptr_t** ret_fp);
108
109 static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr);
110
111 // This boolean allows users to forward their own non-matching signals
112 // to JVM_handle_bsd_signal, harmlessly.
113 static bool signal_handlers_are_installed;
114
115 static int get_our_sigflags(int);
116 static void set_our_sigflags(int, int);
117 static void signal_sets_init();
118 static void install_signal_handlers();
119 static void set_signal_handler(int, bool);
120 static bool is_sig_ignored(int sig);
121
122 static sigset_t* unblocked_signals();
123 static sigset_t* vm_signals();
124 static sigset_t* allowdebug_blocked_signals();
125
126 // For signal-chaining
127 static struct sigaction *get_chained_signal_action(int sig);
128 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
129
130 // Minimum stack size a thread can be created with (allowing
131 // the VM to completely create the thread and enter user code)
132 static size_t min_stack_allowed;
133
134 // Return default stack size or guard size for the specified thread type
135 static size_t default_stack_size(os::ThreadType thr_type);
136 static size_t default_guard_size(os::ThreadType thr_type);
137
138 // Real-time clock functions
139 static void clock_init(void);
140
141 // Stack repair handling
142
143 // none present
144
145 private:
146 typedef int (*sched_getcpu_func_t)(void);
147 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
148 typedef int (*numa_max_node_func_t)(void);
149 typedef int (*numa_available_func_t)(void);
150 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
151 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
152
153 static sched_getcpu_func_t _sched_getcpu;
154 static numa_node_to_cpus_func_t _numa_node_to_cpus;
155 static numa_max_node_func_t _numa_max_node;
156 static numa_available_func_t _numa_available;
157 static numa_tonode_memory_func_t _numa_tonode_memory;
158 static numa_interleave_memory_func_t _numa_interleave_memory;
159 static unsigned long* _numa_all_nodes;
160
161 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
162 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
163 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
164 static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
165 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
166 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
167 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
168 public:
169 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
170 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
171 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
172 }
173 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
174 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
175 static int numa_tonode_memory(void *start, size_t size, int node) {
176 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
177 }
178 static void numa_interleave_memory(void *start, size_t size) {
179 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
180 _numa_interleave_memory(start, size, _numa_all_nodes);
181 }
182 }
183 static int get_node_by_cpu(int cpu_id);
184 };
185
186
187 class PlatformEvent : public CHeapObj<mtInternal> {
188 private:
189 double CachePad[4]; // increase odds that _mutex is sole occupant of cache line
190 volatile int _Event;
191 volatile int _nParked;
192 pthread_mutex_t _mutex[1];
193 pthread_cond_t _cond[1];
194 double PostPad[2];
195 Thread * _Assoc;
196
197 public: // TODO-FIXME: make dtor private
198 ~PlatformEvent() { guarantee(0, "invariant"); }
199
200 public:
201 PlatformEvent() {
202 int status;
203 status = pthread_cond_init(_cond, NULL);
204 assert_status(status == 0, status, "cond_init");
205 status = pthread_mutex_init(_mutex, NULL);
206 assert_status(status == 0, status, "mutex_init");
207 _Event = 0;
208 _nParked = 0;
209 _Assoc = NULL;
210 }
211
212 // Use caution with reset() and fired() -- they may require MEMBARs
213 void reset() { _Event = 0; }
214 int fired() { return _Event; }
215 void park();
216 void unpark();
217 int park(jlong millis);
218 void SetAssociation(Thread * a) { _Assoc = a; }
219 };
220
221 class PlatformParker : public CHeapObj<mtInternal> {
222 protected:
223 pthread_mutex_t _mutex[1];
224 pthread_cond_t _cond[1];
225
226 public: // TODO-FIXME: make dtor private
227 ~PlatformParker() { guarantee(0, "invariant"); }
228
229 public:
230 PlatformParker() {
231 int status;
232 status = pthread_cond_init(_cond, NULL);
233 assert_status(status == 0, status, "cond_init");
234 status = pthread_mutex_init(_mutex, NULL);
235 assert_status(status == 0, status, "mutex_init");
236 }
237 };
238
239 #endif // OS_BSD_VM_OS_BSD_HPP