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