Mercurial > hg > graal-compiler
annotate src/os/linux/vm/os_linux.hpp @ 8710:9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
Summary: Detect the execstack attribute of the loaded library and attempt to fix the stack guard using Safepoint op.
Reviewed-by: dholmes, zgu
Contributed-by: ioi.lam@oracle.com
author | iklam |
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date | Tue, 05 Mar 2013 13:55:56 -0800 |
parents | 63e54c37ac64 |
children | 14509df4cd63 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef OS_LINUX_VM_OS_LINUX_HPP |
26 #define OS_LINUX_VM_OS_LINUX_HPP | |
27 | |
0 | 28 // Linux_OS defines the interface to Linux operating systems |
29 | |
30 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */ | |
31 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); | |
32 | |
33 class Linux { | |
34 friend class os; | |
35 | |
36 // For signal-chaining | |
37 #define MAXSIGNUM 32 | |
38 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions | |
39 static unsigned int sigs; // mask of signals that have | |
40 // preinstalled signal handlers | |
41 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), | |
42 // __sigaction(), signal() is loaded | |
43 static struct sigaction *(*get_signal_action)(int); | |
44 static struct sigaction *get_preinstalled_handler(int); | |
45 static void save_preinstalled_handler(int, struct sigaction&); | |
46 | |
47 static void check_signal_handler(int sig); | |
48 | |
49 // For signal flags diagnostics | |
50 static int sigflags[MAXSIGNUM]; | |
51 | |
52 static int (*_clock_gettime)(clockid_t, struct timespec *); | |
53 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); | |
54 | |
55 static address _initial_thread_stack_bottom; | |
56 static uintptr_t _initial_thread_stack_size; | |
57 | |
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58 static const char *_glibc_version; |
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59 static const char *_libpthread_version; |
0 | 60 |
61 static bool _is_floating_stack; | |
62 static bool _is_NPTL; | |
63 static bool _supports_fast_thread_cpu_time; | |
64 | |
141 | 65 static GrowableArray<int>* _cpu_to_node; |
66 | |
0 | 67 protected: |
68 | |
69 static julong _physical_memory; | |
70 static pthread_t _main_thread; | |
71 static Mutex* _createThread_lock; | |
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 | |
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78 static void set_glibc_version(const char *s) { _glibc_version = s; } |
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79 static void set_libpthread_version(const char *s) { _libpthread_version = s; } |
0 | 80 |
81 static bool supports_variable_stack_size(); | |
82 | |
83 static void set_is_NPTL() { _is_NPTL = true; } | |
84 static void set_is_LinuxThreads() { _is_NPTL = false; } | |
85 static void set_is_floating_stack() { _is_floating_stack = true; } | |
86 | |
141 | 87 static void rebuild_cpu_to_node_map(); |
88 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } | |
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89 |
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90 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); |
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91 |
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92 static void print_full_memory_info(outputStream* st); |
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93 static void print_distro_info(outputStream* st); |
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94 static void print_libversion_info(outputStream* st); |
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95 |
0 | 96 public: |
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97 static bool _stack_is_executable; |
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98 static void *dll_load_inner(const char *name); |
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99 |
0 | 100 static void init_thread_fpu_state(); |
101 static int get_fpu_control_word(); | |
102 static void set_fpu_control_word(int fpu_control); | |
103 static pthread_t main_thread(void) { return _main_thread; } | |
104 // returns kernel thread id (similar to LWP id on Solaris), which can be | |
105 // used to access /proc | |
106 static pid_t gettid(); | |
107 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } | |
108 static Mutex* createThread_lock(void) { return _createThread_lock; } | |
109 static void hotspot_sigmask(Thread* thread); | |
110 | |
111 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } | |
112 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } | |
113 static bool is_initial_thread(void); | |
114 | |
115 static int page_size(void) { return _page_size; } | |
116 static void set_page_size(int val) { _page_size = val; } | |
117 | |
118 static address ucontext_get_pc(ucontext_t* uc); | |
119 static intptr_t* ucontext_get_sp(ucontext_t* uc); | |
120 static intptr_t* ucontext_get_fp(ucontext_t* uc); | |
121 | |
122 // For Analyzer Forte AsyncGetCallTrace profiling support: | |
123 // | |
124 // This interface should be declared in os_linux_i486.hpp, but | |
125 // that file provides extensions to the os class and not the | |
126 // Linux class. | |
127 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, | |
128 intptr_t** ret_sp, intptr_t** ret_fp); | |
129 | |
130 // This boolean allows users to forward their own non-matching signals | |
131 // to JVM_handle_linux_signal, harmlessly. | |
132 static bool signal_handlers_are_installed; | |
133 | |
134 static int get_our_sigflags(int); | |
135 static void set_our_sigflags(int, int); | |
136 static void signal_sets_init(); | |
137 static void install_signal_handlers(); | |
138 static void set_signal_handler(int, bool); | |
139 static bool is_sig_ignored(int sig); | |
140 | |
141 static sigset_t* unblocked_signals(); | |
142 static sigset_t* vm_signals(); | |
143 static sigset_t* allowdebug_blocked_signals(); | |
144 | |
145 // For signal-chaining | |
146 static struct sigaction *get_chained_signal_action(int sig); | |
147 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); | |
148 | |
149 // GNU libc and libpthread version strings | |
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150 static const char *glibc_version() { return _glibc_version; } |
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151 static const char *libpthread_version() { return _libpthread_version; } |
0 | 152 |
153 // NPTL or LinuxThreads? | |
154 static bool is_LinuxThreads() { return !_is_NPTL; } | |
155 static bool is_NPTL() { return _is_NPTL; } | |
156 | |
157 // NPTL is always floating stack. LinuxThreads could be using floating | |
158 // stack or fixed stack. | |
159 static bool is_floating_stack() { return _is_floating_stack; } | |
160 | |
161 static void libpthread_init(); | |
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162 static bool libnuma_init(); |
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163 static void* libnuma_dlsym(void* handle, const char* name); |
0 | 164 // Minimum stack size a thread can be created with (allowing |
165 // the VM to completely create the thread and enter user code) | |
166 static size_t min_stack_allowed; | |
167 | |
168 // Return default stack size or guard size for the specified thread type | |
169 static size_t default_stack_size(os::ThreadType thr_type); | |
170 static size_t default_guard_size(os::ThreadType thr_type); | |
171 | |
172 static void capture_initial_stack(size_t max_size); | |
173 | |
174 // Stack overflow handling | |
175 static bool manually_expand_stack(JavaThread * t, address addr); | |
176 static int max_register_window_saves_before_flushing(); | |
177 | |
178 // Real-time clock functions | |
179 static void clock_init(void); | |
180 | |
181 // fast POSIX clocks support | |
182 static void fast_thread_clock_init(void); | |
183 | |
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184 static inline bool supports_monotonic_clock() { |
0 | 185 return _clock_gettime != NULL; |
186 } | |
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 // Stack repair handling | |
203 | |
204 // none present | |
205 | |
206 // LinuxThreads work-around for 6292965 | |
207 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); | |
208 | |
209 | |
210 // Linux suspend/resume support - this helper is a shadow of its former | |
211 // self now that low-level suspension is barely used, and old workarounds | |
212 // for LinuxThreads are no longer needed. | |
213 class SuspendResume { | |
214 private: | |
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215 volatile int _suspend_action; |
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216 volatile jint _state; |
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217 public: |
0 | 218 // values for suspend_action: |
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219 enum { |
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220 SR_NONE = 0x00, |
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221 SR_SUSPEND = 0x01, // suspend request |
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222 SR_CONTINUE = 0x02, // resume request |
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223 SR_SUSPENDED = 0x20 // values for _state: + SR_NONE |
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224 }; |
0 | 225 |
226 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; } | |
227 | |
228 int suspend_action() const { return _suspend_action; } | |
229 void set_suspend_action(int x) { _suspend_action = x; } | |
230 | |
231 // atomic updates for _state | |
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232 inline void set_suspended(); |
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233 inline void clear_suspended(); |
0 | 234 bool is_suspended() { return _state & SR_SUSPENDED; } |
235 | |
236 }; | |
141 | 237 |
238 private: | |
239 typedef int (*sched_getcpu_func_t)(void); | |
240 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); | |
241 typedef int (*numa_max_node_func_t)(void); | |
242 typedef int (*numa_available_func_t)(void); | |
243 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); | |
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244 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); |
141 | 245 |
246 static sched_getcpu_func_t _sched_getcpu; | |
247 static numa_node_to_cpus_func_t _numa_node_to_cpus; | |
248 static numa_max_node_func_t _numa_max_node; | |
249 static numa_available_func_t _numa_available; | |
250 static numa_tonode_memory_func_t _numa_tonode_memory; | |
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251 static numa_interleave_memory_func_t _numa_interleave_memory; |
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252 static unsigned long* _numa_all_nodes; |
141 | 253 |
254 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } | |
255 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } | |
256 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } | |
257 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } | |
258 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } | |
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259 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } |
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260 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } |
3826 | 261 static int sched_getcpu_syscall(void); |
141 | 262 public: |
263 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } | |
264 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { | |
265 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; | |
266 } | |
267 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } | |
268 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } | |
269 static int numa_tonode_memory(void *start, size_t size, int node) { | |
270 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; | |
271 } | |
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272 static void numa_interleave_memory(void *start, size_t size) { |
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273 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { |
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274 _numa_interleave_memory(start, size, _numa_all_nodes); |
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275 } |
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276 } |
141 | 277 static int get_node_by_cpu(int cpu_id); |
0 | 278 }; |
279 | |
280 | |
6197 | 281 class PlatformEvent : public CHeapObj<mtInternal> { |
0 | 282 private: |
283 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line | |
284 volatile int _Event ; | |
285 volatile int _nParked ; | |
286 pthread_mutex_t _mutex [1] ; | |
287 pthread_cond_t _cond [1] ; | |
288 double PostPad [2] ; | |
289 Thread * _Assoc ; | |
290 | |
291 public: // TODO-FIXME: make dtor private | |
292 ~PlatformEvent() { guarantee (0, "invariant") ; } | |
293 | |
294 public: | |
295 PlatformEvent() { | |
296 int status; | |
297 status = pthread_cond_init (_cond, NULL); | |
298 assert_status(status == 0, status, "cond_init"); | |
299 status = pthread_mutex_init (_mutex, NULL); | |
300 assert_status(status == 0, status, "mutex_init"); | |
301 _Event = 0 ; | |
302 _nParked = 0 ; | |
303 _Assoc = NULL ; | |
304 } | |
305 | |
306 // Use caution with reset() and fired() -- they may require MEMBARs | |
307 void reset() { _Event = 0 ; } | |
308 int fired() { return _Event; } | |
309 void park () ; | |
310 void unpark () ; | |
311 int TryPark () ; | |
312 int park (jlong millis) ; | |
313 void SetAssociation (Thread * a) { _Assoc = a ; } | |
314 } ; | |
315 | |
6197 | 316 class PlatformParker : public CHeapObj<mtInternal> { |
0 | 317 protected: |
318 pthread_mutex_t _mutex [1] ; | |
319 pthread_cond_t _cond [1] ; | |
320 | |
321 public: // TODO-FIXME: make dtor private | |
322 ~PlatformParker() { guarantee (0, "invariant") ; } | |
323 | |
324 public: | |
325 PlatformParker() { | |
326 int status; | |
327 status = pthread_cond_init (_cond, NULL); | |
328 assert_status(status == 0, status, "cond_init"); | |
329 status = pthread_mutex_init (_mutex, NULL); | |
330 assert_status(status == 0, status, "mutex_init"); | |
331 } | |
332 } ; | |
1972 | 333 |
334 #endif // OS_LINUX_VM_OS_LINUX_HPP |