Mercurial > hg > truffle
annotate src/os_cpu/windows_x86/vm/os_windows_x86.cpp @ 10976:dba2306ee2e3
Merge
author | zgu |
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date | Fri, 14 Jun 2013 07:39:19 -0700 |
parents | 12285410684f |
children | 5fc51c1ecdeb 980532a806a5 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2012, 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 // no precompiled headers |
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26 #include "asm/macroAssembler.hpp" |
1972 | 27 #include "classfile/classLoader.hpp" |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/icBuffer.hpp" | |
31 #include "code/vtableStubs.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "jvm_windows.h" | |
34 #include "memory/allocation.inline.hpp" | |
35 #include "mutex_windows.inline.hpp" | |
36 #include "nativeInst_x86.hpp" | |
37 #include "os_share_windows.hpp" | |
38 #include "prims/jniFastGetField.hpp" | |
39 #include "prims/jvm.h" | |
40 #include "prims/jvm_misc.hpp" | |
41 #include "runtime/arguments.hpp" | |
42 #include "runtime/extendedPC.hpp" | |
43 #include "runtime/frame.inline.hpp" | |
44 #include "runtime/interfaceSupport.hpp" | |
45 #include "runtime/java.hpp" | |
46 #include "runtime/javaCalls.hpp" | |
47 #include "runtime/mutexLocker.hpp" | |
48 #include "runtime/osThread.hpp" | |
49 #include "runtime/sharedRuntime.hpp" | |
50 #include "runtime/stubRoutines.hpp" | |
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51 #include "runtime/thread.inline.hpp" |
1972 | 52 #include "runtime/timer.hpp" |
53 #include "utilities/events.hpp" | |
54 #include "utilities/vmError.hpp" | |
55 | |
0 | 56 # include "unwind_windows_x86.hpp" |
57 #undef REG_SP | |
58 #undef REG_FP | |
59 #undef REG_PC | |
60 #ifdef AMD64 | |
61 #define REG_SP Rsp | |
62 #define REG_FP Rbp | |
63 #define REG_PC Rip | |
64 #else | |
65 #define REG_SP Esp | |
66 #define REG_FP Ebp | |
67 #define REG_PC Eip | |
68 #endif // AMD64 | |
69 | |
70 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* ); | |
71 | |
72 // Install a win32 structured exception handler around thread. | |
73 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { | |
74 __try { | |
75 | |
76 #ifndef AMD64 | |
77 // We store the current thread in this wrapperthread location | |
78 // and determine how far away this address is from the structured | |
79 // execption pointer that FS:[0] points to. This get_thread | |
80 // code can then get the thread pointer via FS. | |
81 // | |
82 // Warning: This routine must NEVER be inlined since we'd end up with | |
83 // multiple offsets. | |
84 // | |
85 volatile Thread* wrapperthread = thread; | |
86 | |
87 if ( ThreadLocalStorage::get_thread_ptr_offset() == 0 ) { | |
88 int thread_ptr_offset; | |
89 __asm { | |
90 lea eax, dword ptr wrapperthread; | |
91 sub eax, dword ptr FS:[0H]; | |
92 mov thread_ptr_offset, eax | |
93 }; | |
94 ThreadLocalStorage::set_thread_ptr_offset(thread_ptr_offset); | |
95 } | |
96 #ifdef ASSERT | |
97 // Verify that the offset hasn't changed since we initally captured | |
98 // it. This might happen if we accidentally ended up with an | |
99 // inlined version of this routine. | |
100 else { | |
101 int test_thread_ptr_offset; | |
102 __asm { | |
103 lea eax, dword ptr wrapperthread; | |
104 sub eax, dword ptr FS:[0H]; | |
105 mov test_thread_ptr_offset, eax | |
106 }; | |
107 assert(test_thread_ptr_offset == ThreadLocalStorage::get_thread_ptr_offset(), | |
108 "thread pointer offset from SEH changed"); | |
109 } | |
110 #endif // ASSERT | |
111 #endif // !AMD64 | |
112 | |
113 f(value, method, args, thread); | |
114 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { | |
115 // Nothing to do. | |
116 } | |
117 } | |
118 | |
119 #ifdef AMD64 | |
120 | |
121 // This is the language specific handler for exceptions | |
122 // originating from dynamically generated code. | |
123 // We call the standard structured exception handler | |
124 // We only expect Continued Execution since we cannot unwind | |
125 // from generated code. | |
126 LONG HandleExceptionFromCodeCache( | |
127 IN PEXCEPTION_RECORD ExceptionRecord, | |
128 IN ULONG64 EstablisherFrame, | |
129 IN OUT PCONTEXT ContextRecord, | |
130 IN OUT PDISPATCHER_CONTEXT DispatcherContext) { | |
131 EXCEPTION_POINTERS ep; | |
132 LONG result; | |
133 | |
134 ep.ExceptionRecord = ExceptionRecord; | |
135 ep.ContextRecord = ContextRecord; | |
136 | |
137 result = topLevelExceptionFilter(&ep); | |
138 | |
139 // We better only get a CONTINUE_EXECUTION from our handler | |
140 // since we don't have unwind information registered. | |
141 | |
142 guarantee( result == EXCEPTION_CONTINUE_EXECUTION, | |
143 "Unexpected result from topLevelExceptionFilter"); | |
144 | |
145 return(ExceptionContinueExecution); | |
146 } | |
147 | |
148 | |
149 // Structure containing the Windows Data Structures required | |
150 // to register our Code Cache exception handler. | |
151 // We put these in the CodeCache since the API requires | |
152 // all addresses in these structures are relative to the Code | |
153 // area registered with RtlAddFunctionTable. | |
154 typedef struct { | |
155 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache | |
156 RUNTIME_FUNCTION rt; | |
157 UNWIND_INFO_EH_ONLY unw; | |
158 } DynamicCodeData, *pDynamicCodeData; | |
159 | |
160 #endif // AMD64 | |
161 // | |
162 // Register our CodeCache area with the OS so it will dispatch exceptions | |
163 // to our topLevelExceptionFilter when we take an exception in our | |
164 // dynamically generated code. | |
165 // | |
166 // Arguments: low and high are the address of the full reserved | |
167 // codeCache area | |
168 // | |
169 bool os::register_code_area(char *low, char *high) { | |
170 #ifdef AMD64 | |
171 | |
172 ResourceMark rm; | |
173 | |
174 pDynamicCodeData pDCD; | |
175 PRUNTIME_FUNCTION prt; | |
176 PUNWIND_INFO_EH_ONLY punwind; | |
177 | |
1748 | 178 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData)); |
179 CodeBuffer cb(blob); | |
0 | 180 MacroAssembler* masm = new MacroAssembler(&cb); |
181 pDCD = (pDynamicCodeData) masm->pc(); | |
182 | |
183 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache)); | |
184 masm->flush(); | |
185 | |
186 // Create an Unwind Structure specifying no unwind info | |
187 // other than an Exception Handler | |
188 punwind = &pDCD->unw; | |
189 punwind->Version = 1; | |
190 punwind->Flags = UNW_FLAG_EHANDLER; | |
191 punwind->SizeOfProlog = 0; | |
192 punwind->CountOfCodes = 0; | |
193 punwind->FrameRegister = 0; | |
194 punwind->FrameOffset = 0; | |
195 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) - | |
196 (char*)low; | |
197 punwind->ExceptionData[0] = 0; | |
198 | |
199 // This structure describes the covered dynamic code area. | |
200 // Addresses are relative to the beginning on the code cache area | |
201 prt = &pDCD->rt; | |
202 prt->BeginAddress = 0; | |
203 prt->EndAddress = (ULONG)(high - low); | |
204 prt->UnwindData = ((char *)punwind - low); | |
205 | |
206 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low), | |
207 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable"); | |
208 | |
209 #endif // AMD64 | |
210 return true; | |
211 } | |
212 | |
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213 void os::initialize_thread(Thread* thr) { |
0 | 214 // Nothing to do. |
215 } | |
216 | |
217 // Atomics and Stub Functions | |
218 | |
219 typedef jint xchg_func_t (jint, volatile jint*); | |
220 typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*); | |
221 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); | |
222 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong); | |
223 typedef jint add_func_t (jint, volatile jint*); | |
224 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*); | |
225 | |
226 #ifdef AMD64 | |
227 | |
228 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { | |
229 // try to use the stub: | |
230 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); | |
231 | |
232 if (func != NULL) { | |
233 os::atomic_xchg_func = func; | |
234 return (*func)(exchange_value, dest); | |
235 } | |
236 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
237 | |
238 jint old_value = *dest; | |
239 *dest = exchange_value; | |
240 return old_value; | |
241 } | |
242 | |
243 intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) { | |
244 // try to use the stub: | |
245 xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry()); | |
246 | |
247 if (func != NULL) { | |
248 os::atomic_xchg_ptr_func = func; | |
249 return (*func)(exchange_value, dest); | |
250 } | |
251 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
252 | |
253 intptr_t old_value = *dest; | |
254 *dest = exchange_value; | |
255 return old_value; | |
256 } | |
257 | |
258 | |
259 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { | |
260 // try to use the stub: | |
261 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); | |
262 | |
263 if (func != NULL) { | |
264 os::atomic_cmpxchg_func = func; | |
265 return (*func)(exchange_value, dest, compare_value); | |
266 } | |
267 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
268 | |
269 jint old_value = *dest; | |
270 if (old_value == compare_value) | |
271 *dest = exchange_value; | |
272 return old_value; | |
273 } | |
274 #endif // AMD64 | |
275 | |
276 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { | |
277 // try to use the stub: | |
278 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); | |
279 | |
280 if (func != NULL) { | |
281 os::atomic_cmpxchg_long_func = func; | |
282 return (*func)(exchange_value, dest, compare_value); | |
283 } | |
284 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
285 | |
286 jlong old_value = *dest; | |
287 if (old_value == compare_value) | |
288 *dest = exchange_value; | |
289 return old_value; | |
290 } | |
291 | |
292 #ifdef AMD64 | |
293 | |
294 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { | |
295 // try to use the stub: | |
296 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); | |
297 | |
298 if (func != NULL) { | |
299 os::atomic_add_func = func; | |
300 return (*func)(add_value, dest); | |
301 } | |
302 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
303 | |
304 return (*dest) += add_value; | |
305 } | |
306 | |
307 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) { | |
308 // try to use the stub: | |
309 add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry()); | |
310 | |
311 if (func != NULL) { | |
312 os::atomic_add_ptr_func = func; | |
313 return (*func)(add_value, dest); | |
314 } | |
315 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
316 | |
317 return (*dest) += add_value; | |
318 } | |
319 | |
320 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; | |
321 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap; | |
322 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; | |
323 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; | |
324 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap; | |
325 | |
326 #endif // AMD64 | |
327 | |
328 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; | |
329 | |
330 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
331 intptr_t** ret_sp, intptr_t** ret_fp) { | |
332 | |
333 ExtendedPC epc; | |
334 CONTEXT* uc = (CONTEXT*)ucVoid; | |
335 | |
336 if (uc != NULL) { | |
337 epc = ExtendedPC((address)uc->REG_PC); | |
338 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP; | |
339 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP; | |
340 } else { | |
341 // construct empty ExtendedPC for return value checking | |
342 epc = ExtendedPC(NULL); | |
343 if (ret_sp) *ret_sp = (intptr_t *)NULL; | |
344 if (ret_fp) *ret_fp = (intptr_t *)NULL; | |
345 } | |
346 | |
347 return epc; | |
348 } | |
349 | |
350 frame os::fetch_frame_from_context(void* ucVoid) { | |
351 intptr_t* sp; | |
352 intptr_t* fp; | |
353 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
354 return frame(sp, fp, epc.pc()); | |
355 } | |
356 | |
357 // VC++ does not save frame pointer on stack in optimized build. It | |
358 // can be turned off by /Oy-. If we really want to walk C frames, | |
359 // we can use the StackWalk() API. | |
360 frame os::get_sender_for_C_frame(frame* fr) { | |
361 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
362 } | |
363 | |
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364 #ifndef AMD64 |
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365 // Returns an estimate of the current stack pointer. Result must be guaranteed |
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366 // to point into the calling threads stack, and be no lower than the current |
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367 // stack pointer. |
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368 address os::current_stack_pointer() { |
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369 int dummy; |
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370 address sp = (address)&dummy; |
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371 return sp; |
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372 } |
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373 #else |
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374 // Returns the current stack pointer. Accurate value needed for |
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375 // os::verify_stack_alignment(). |
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376 address os::current_stack_pointer() { |
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377 typedef address get_sp_func(); |
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378 get_sp_func* func = CAST_TO_FN_PTR(get_sp_func*, |
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379 StubRoutines::x86::get_previous_sp_entry()); |
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380 return (*func)(); |
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381 } |
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382 #endif |
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383 |
0 | 384 |
385 #ifndef AMD64 | |
386 intptr_t* _get_previous_fp() { | |
387 intptr_t **frameptr; | |
388 __asm { | |
389 mov frameptr, ebp | |
390 }; | |
391 return *frameptr; | |
392 } | |
393 #endif // !AMD64 | |
394 | |
395 frame os::current_frame() { | |
396 | |
397 #ifdef AMD64 | |
398 // apparently _asm not supported on windows amd64 | |
399 typedef intptr_t* get_fp_func (); | |
400 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*, | |
304 | 401 StubRoutines::x86::get_previous_fp_entry()); |
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402 if (func == NULL) return frame(); |
0 | 403 intptr_t* fp = (*func)(); |
404 #else | |
405 intptr_t* fp = _get_previous_fp(); | |
406 #endif // AMD64 | |
407 | |
408 frame myframe((intptr_t*)os::current_stack_pointer(), | |
409 (intptr_t*)fp, | |
410 CAST_FROM_FN_PTR(address, os::current_frame)); | |
411 if (os::is_first_C_frame(&myframe)) { | |
412 // stack is not walkable | |
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413 return frame(); |
0 | 414 } else { |
415 return os::get_sender_for_C_frame(&myframe); | |
416 } | |
417 } | |
418 | |
419 void os::print_context(outputStream *st, void *context) { | |
420 if (context == NULL) return; | |
421 | |
422 CONTEXT* uc = (CONTEXT*)context; | |
423 | |
424 st->print_cr("Registers:"); | |
425 #ifdef AMD64 | |
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426 st->print( "RAX=" INTPTR_FORMAT, uc->Rax); |
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427 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx); |
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428 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx); |
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429 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx); |
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430 st->cr(); |
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431 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp); |
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432 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp); |
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433 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi); |
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434 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi); |
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435 st->cr(); |
1907 | 436 st->print( "R8 =" INTPTR_FORMAT, uc->R8); |
437 st->print(", R9 =" INTPTR_FORMAT, uc->R9); | |
1681
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438 st->print(", R10=" INTPTR_FORMAT, uc->R10); |
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439 st->print(", R11=" INTPTR_FORMAT, uc->R11); |
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440 st->cr(); |
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441 st->print( "R12=" INTPTR_FORMAT, uc->R12); |
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442 st->print(", R13=" INTPTR_FORMAT, uc->R13); |
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443 st->print(", R14=" INTPTR_FORMAT, uc->R14); |
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444 st->print(", R15=" INTPTR_FORMAT, uc->R15); |
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445 st->cr(); |
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446 st->print( "RIP=" INTPTR_FORMAT, uc->Rip); |
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447 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags); |
0 | 448 #else |
449 st->print( "EAX=" INTPTR_FORMAT, uc->Eax); | |
450 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx); | |
451 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx); | |
452 st->print(", EDX=" INTPTR_FORMAT, uc->Edx); | |
453 st->cr(); | |
454 st->print( "ESP=" INTPTR_FORMAT, uc->Esp); | |
455 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp); | |
456 st->print(", ESI=" INTPTR_FORMAT, uc->Esi); | |
457 st->print(", EDI=" INTPTR_FORMAT, uc->Edi); | |
458 st->cr(); | |
459 st->print( "EIP=" INTPTR_FORMAT, uc->Eip); | |
460 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags); | |
461 #endif // AMD64 | |
462 st->cr(); | |
463 st->cr(); | |
464 | |
465 intptr_t *sp = (intptr_t *)uc->REG_SP; | |
466 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
467 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); | |
468 st->cr(); | |
469 | |
470 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
471 // point to garbage if entry point in an nmethod is corrupted. Leave | |
472 // this at the end, and hope for the best. | |
473 address pc = (address)uc->REG_PC; | |
474 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
1907 | 475 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); |
476 st->cr(); | |
477 } | |
478 | |
479 | |
480 void os::print_register_info(outputStream *st, void *context) { | |
481 if (context == NULL) return; | |
482 | |
483 CONTEXT* uc = (CONTEXT*)context; | |
484 | |
485 st->print_cr("Register to memory mapping:"); | |
486 st->cr(); | |
487 | |
488 // this is only for the "general purpose" registers | |
489 | |
490 #ifdef AMD64 | |
491 st->print("RAX="); print_location(st, uc->Rax); | |
492 st->print("RBX="); print_location(st, uc->Rbx); | |
493 st->print("RCX="); print_location(st, uc->Rcx); | |
494 st->print("RDX="); print_location(st, uc->Rdx); | |
495 st->print("RSP="); print_location(st, uc->Rsp); | |
496 st->print("RBP="); print_location(st, uc->Rbp); | |
497 st->print("RSI="); print_location(st, uc->Rsi); | |
498 st->print("RDI="); print_location(st, uc->Rdi); | |
499 st->print("R8 ="); print_location(st, uc->R8); | |
500 st->print("R9 ="); print_location(st, uc->R9); | |
501 st->print("R10="); print_location(st, uc->R10); | |
502 st->print("R11="); print_location(st, uc->R11); | |
503 st->print("R12="); print_location(st, uc->R12); | |
504 st->print("R13="); print_location(st, uc->R13); | |
505 st->print("R14="); print_location(st, uc->R14); | |
506 st->print("R15="); print_location(st, uc->R15); | |
507 #else | |
508 st->print("EAX="); print_location(st, uc->Eax); | |
509 st->print("EBX="); print_location(st, uc->Ebx); | |
510 st->print("ECX="); print_location(st, uc->Ecx); | |
511 st->print("EDX="); print_location(st, uc->Edx); | |
512 st->print("ESP="); print_location(st, uc->Esp); | |
513 st->print("EBP="); print_location(st, uc->Ebp); | |
514 st->print("ESI="); print_location(st, uc->Esi); | |
515 st->print("EDI="); print_location(st, uc->Edi); | |
516 #endif | |
517 | |
0 | 518 st->cr(); |
519 } | |
520 | |
521 extern "C" int SafeFetch32 (int * adr, int Err) { | |
522 int rv = Err ; | |
523 _try { | |
524 rv = *((volatile int *) adr) ; | |
525 } __except(EXCEPTION_EXECUTE_HANDLER) { | |
526 } | |
527 return rv ; | |
528 } | |
529 | |
530 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t Err) { | |
531 intptr_t rv = Err ; | |
532 _try { | |
533 rv = *((volatile intptr_t *) adr) ; | |
534 } __except(EXCEPTION_EXECUTE_HANDLER) { | |
535 } | |
536 return rv ; | |
537 } | |
538 | |
539 extern "C" int SpinPause () { | |
540 #ifdef AMD64 | |
541 return 0 ; | |
542 #else | |
543 // pause == rep:nop | |
544 // On systems that don't support pause a rep:nop | |
545 // is executed as a nop. The rep: prefix is ignored. | |
546 _asm { | |
547 pause ; | |
548 }; | |
549 return 1 ; | |
550 #endif // AMD64 | |
551 } | |
552 | |
553 | |
554 void os::setup_fpu() { | |
555 #ifndef AMD64 | |
556 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std(); | |
557 __asm fldcw fpu_cntrl_word; | |
558 #endif // !AMD64 | |
559 } | |
5903
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560 |
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561 #ifndef PRODUCT |
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562 void os::verify_stack_alignment() { |
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563 #ifdef AMD64 |
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564 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); |
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565 #endif |
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566 } |
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567 #endif |