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_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.
31 static bool zero_page_read_protected() { return true; }
32
33 class 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
161 // For signal-chaining
162 static struct sigaction *get_chained_signal_action(int sig);
163 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
164
165 // GNU libc and libpthread version strings
166 static const char *glibc_version() { return _glibc_version; }
167 static const char *libpthread_version() { return _libpthread_version; }
168
169 static void libpthread_init();
170 static bool libnuma_init();
171 static void* libnuma_dlsym(void* handle, const char* name);
172
173 // Return default guard size for the specified thread type
174 static size_t default_guard_size(os::ThreadType thr_type);
175
176 static void capture_initial_stack(size_t max_size);
177
178 // Stack overflow handling
179 static bool manually_expand_stack(JavaThread * t, address addr);
180 static int max_register_window_saves_before_flushing();
181
182 // Real-time clock functions
183 static void clock_init(void);
184
185 // fast POSIX clocks support
186 static void fast_thread_clock_init(void);
187
188 static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
189 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
190 }
191
192 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
193 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
194 }
195
196 static bool supports_fast_thread_cpu_time() {
197 return _supports_fast_thread_cpu_time;
198 }
199
200 static jlong fast_thread_cpu_time(clockid_t clockid);
201
202 static void initialize_os_info();
203 static bool os_version_is_known();
204 static uint32_t os_version();
205
206 // Stack repair handling
207
208 // none present
209
210 private:
211 typedef int (*sched_getcpu_func_t)(void);
212 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
213 typedef int (*numa_max_node_func_t)(void);
214 typedef int (*numa_available_func_t)(void);
215 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
216 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
217 typedef void (*numa_set_bind_policy_func_t)(int policy);
218
219 static sched_getcpu_func_t _sched_getcpu;
220 static numa_node_to_cpus_func_t _numa_node_to_cpus;
221 static numa_max_node_func_t _numa_max_node;
222 static numa_available_func_t _numa_available;
223 static numa_tonode_memory_func_t _numa_tonode_memory;
224 static numa_interleave_memory_func_t _numa_interleave_memory;
225 static numa_set_bind_policy_func_t _numa_set_bind_policy;
226 static unsigned long* _numa_all_nodes;
227
228 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
229 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
230 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
231 static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
232 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
233 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
234 static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; }
235 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
236 static int sched_getcpu_syscall(void);
237 public:
238 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
239 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
240 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
241 }
242 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
243 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
244 static int numa_tonode_memory(void *start, size_t size, int node) {
245 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
246 }
247 static void numa_interleave_memory(void *start, size_t size) {
248 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
249 _numa_interleave_memory(start, size, _numa_all_nodes);
250 }
251 }
252 static void numa_set_bind_policy(int policy) {
253 if (_numa_set_bind_policy != NULL) {
254 _numa_set_bind_policy(policy);
255 }
256 }
257 static int get_node_by_cpu(int cpu_id);
258 };
259
260 #endif // OS_LINUX_VM_OS_LINUX_HPP