1 /*
2 * Copyright (c) 1999, 2017, 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 class Bsd {
34 friend class os;
35
36 // For signal-chaining
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 #ifdef __APPLE__
46 // mach_absolute_time
47 static mach_timebase_info_data_t _timebase_info;
48 static volatile uint64_t _max_abstime;
49 #else
50 static int (*_clock_gettime)(clockid_t, struct timespec *);
51 #endif
52
53 static GrowableArray<int>* _cpu_to_node;
54
55 protected:
56
57 static julong _physical_memory;
58 static pthread_t _main_thread;
59 static int _page_size;
60
61 static julong available_memory();
62 static julong physical_memory() { return _physical_memory; }
63 static void initialize_system_info();
64
65 static void rebuild_cpu_to_node_map();
66 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
67
68 static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
69
70 public:
71
72 static void init_thread_fpu_state();
73 static pthread_t main_thread(void) { return _main_thread; }
74
75 static void hotspot_sigmask(Thread* thread);
76
77 static bool is_initial_thread(void);
78 static pid_t gettid();
79
80 static int page_size(void) { return _page_size; }
81 static void set_page_size(int val) { _page_size = val; }
82
83 static address ucontext_get_pc(const ucontext_t* uc);
84 static void ucontext_set_pc(ucontext_t* uc, address pc);
85 static intptr_t* ucontext_get_sp(const ucontext_t* uc);
86 static intptr_t* ucontext_get_fp(const ucontext_t* uc);
87
88 // For Analyzer Forte AsyncGetCallTrace profiling support:
89 //
90 // This interface should be declared in os_bsd_i486.hpp, but
91 // that file provides extensions to the os class and not the
92 // Bsd class.
93 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, const ucontext_t* uc,
94 intptr_t** ret_sp, intptr_t** ret_fp);
95
96 static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr);
97
98 // This boolean allows users to forward their own non-matching signals
99 // to JVM_handle_bsd_signal, harmlessly.
100 static bool signal_handlers_are_installed;
101
102 static int get_our_sigflags(int);
103 static void set_our_sigflags(int, int);
104 static void signal_sets_init();
105 static void install_signal_handlers();
106 static void set_signal_handler(int, bool);
107 static bool is_sig_ignored(int sig);
108
109 static sigset_t* unblocked_signals();
110 static sigset_t* vm_signals();
111
112 // For signal-chaining
113 static struct sigaction *get_chained_signal_action(int sig);
114 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
115
116 // Real-time clock functions
117 static void clock_init(void);
118
119 // Stack repair handling
120
121 // none present
122
123 private:
124 typedef int (*sched_getcpu_func_t)(void);
125 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
126 typedef int (*numa_max_node_func_t)(void);
127 typedef int (*numa_available_func_t)(void);
128 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
129 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
130
131 static sched_getcpu_func_t _sched_getcpu;
132 static numa_node_to_cpus_func_t _numa_node_to_cpus;
133 static numa_max_node_func_t _numa_max_node;
134 static numa_available_func_t _numa_available;
135 static numa_tonode_memory_func_t _numa_tonode_memory;
136 static numa_interleave_memory_func_t _numa_interleave_memory;
137 static unsigned long* _numa_all_nodes;
138
139 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
140 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
141 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
142 static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
143 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
144 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
145 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
146 public:
147 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
148 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
149 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
150 }
151 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
152 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
153 static int numa_tonode_memory(void *start, size_t size, int node) {
154 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
155 }
156 static void numa_interleave_memory(void *start, size_t size) {
157 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
158 _numa_interleave_memory(start, size, _numa_all_nodes);
159 }
160 }
161 static int get_node_by_cpu(int cpu_id);
162 };
163
164 #endif // OS_BSD_VM_OS_BSD_HPP