Mercurial > hg > truffle
annotate src/os_cpu/windows_x86/vm/os_windows_x86.cpp @ 1748:3e8fbc61cee8
6978355: renaming for 6961697
Summary: This is the renaming part of 6961697 to keep the actual changes small for review.
Reviewed-by: kvn, never
author | twisti |
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date | Wed, 25 Aug 2010 05:27:54 -0700 |
parents | 126ea7725993 |
children | 1e9a9d2e6509 |
rev | line source |
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0 | 1 /* |
1748 | 2 * Copyright (c) 1999, 2010, 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 | |
25 // do not include precompiled header file | |
26 # include "incls/_os_windows_x86.cpp.incl" | |
27 # include "unwind_windows_x86.hpp" | |
28 #undef REG_SP | |
29 #undef REG_FP | |
30 #undef REG_PC | |
31 #ifdef AMD64 | |
32 #define REG_SP Rsp | |
33 #define REG_FP Rbp | |
34 #define REG_PC Rip | |
35 #else | |
36 #define REG_SP Esp | |
37 #define REG_FP Ebp | |
38 #define REG_PC Eip | |
39 #endif // AMD64 | |
40 | |
41 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* ); | |
42 | |
43 // Install a win32 structured exception handler around thread. | |
44 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { | |
45 __try { | |
46 | |
47 #ifndef AMD64 | |
48 // We store the current thread in this wrapperthread location | |
49 // and determine how far away this address is from the structured | |
50 // execption pointer that FS:[0] points to. This get_thread | |
51 // code can then get the thread pointer via FS. | |
52 // | |
53 // Warning: This routine must NEVER be inlined since we'd end up with | |
54 // multiple offsets. | |
55 // | |
56 volatile Thread* wrapperthread = thread; | |
57 | |
58 if ( ThreadLocalStorage::get_thread_ptr_offset() == 0 ) { | |
59 int thread_ptr_offset; | |
60 __asm { | |
61 lea eax, dword ptr wrapperthread; | |
62 sub eax, dword ptr FS:[0H]; | |
63 mov thread_ptr_offset, eax | |
64 }; | |
65 ThreadLocalStorage::set_thread_ptr_offset(thread_ptr_offset); | |
66 } | |
67 #ifdef ASSERT | |
68 // Verify that the offset hasn't changed since we initally captured | |
69 // it. This might happen if we accidentally ended up with an | |
70 // inlined version of this routine. | |
71 else { | |
72 int test_thread_ptr_offset; | |
73 __asm { | |
74 lea eax, dword ptr wrapperthread; | |
75 sub eax, dword ptr FS:[0H]; | |
76 mov test_thread_ptr_offset, eax | |
77 }; | |
78 assert(test_thread_ptr_offset == ThreadLocalStorage::get_thread_ptr_offset(), | |
79 "thread pointer offset from SEH changed"); | |
80 } | |
81 #endif // ASSERT | |
82 #endif // !AMD64 | |
83 | |
84 f(value, method, args, thread); | |
85 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { | |
86 // Nothing to do. | |
87 } | |
88 } | |
89 | |
90 #ifdef AMD64 | |
91 | |
92 // This is the language specific handler for exceptions | |
93 // originating from dynamically generated code. | |
94 // We call the standard structured exception handler | |
95 // We only expect Continued Execution since we cannot unwind | |
96 // from generated code. | |
97 LONG HandleExceptionFromCodeCache( | |
98 IN PEXCEPTION_RECORD ExceptionRecord, | |
99 IN ULONG64 EstablisherFrame, | |
100 IN OUT PCONTEXT ContextRecord, | |
101 IN OUT PDISPATCHER_CONTEXT DispatcherContext) { | |
102 EXCEPTION_POINTERS ep; | |
103 LONG result; | |
104 | |
105 ep.ExceptionRecord = ExceptionRecord; | |
106 ep.ContextRecord = ContextRecord; | |
107 | |
108 result = topLevelExceptionFilter(&ep); | |
109 | |
110 // We better only get a CONTINUE_EXECUTION from our handler | |
111 // since we don't have unwind information registered. | |
112 | |
113 guarantee( result == EXCEPTION_CONTINUE_EXECUTION, | |
114 "Unexpected result from topLevelExceptionFilter"); | |
115 | |
116 return(ExceptionContinueExecution); | |
117 } | |
118 | |
119 | |
120 // Structure containing the Windows Data Structures required | |
121 // to register our Code Cache exception handler. | |
122 // We put these in the CodeCache since the API requires | |
123 // all addresses in these structures are relative to the Code | |
124 // area registered with RtlAddFunctionTable. | |
125 typedef struct { | |
126 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache | |
127 RUNTIME_FUNCTION rt; | |
128 UNWIND_INFO_EH_ONLY unw; | |
129 } DynamicCodeData, *pDynamicCodeData; | |
130 | |
131 #endif // AMD64 | |
132 // | |
133 // Register our CodeCache area with the OS so it will dispatch exceptions | |
134 // to our topLevelExceptionFilter when we take an exception in our | |
135 // dynamically generated code. | |
136 // | |
137 // Arguments: low and high are the address of the full reserved | |
138 // codeCache area | |
139 // | |
140 bool os::register_code_area(char *low, char *high) { | |
141 #ifdef AMD64 | |
142 | |
143 ResourceMark rm; | |
144 | |
145 pDynamicCodeData pDCD; | |
146 PRUNTIME_FUNCTION prt; | |
147 PUNWIND_INFO_EH_ONLY punwind; | |
148 | |
149 // If we are using Vectored Exceptions we don't need this registration | |
150 if (UseVectoredExceptions) return true; | |
151 | |
1748 | 152 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData)); |
153 CodeBuffer cb(blob); | |
0 | 154 MacroAssembler* masm = new MacroAssembler(&cb); |
155 pDCD = (pDynamicCodeData) masm->pc(); | |
156 | |
157 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache)); | |
158 masm->flush(); | |
159 | |
160 // Create an Unwind Structure specifying no unwind info | |
161 // other than an Exception Handler | |
162 punwind = &pDCD->unw; | |
163 punwind->Version = 1; | |
164 punwind->Flags = UNW_FLAG_EHANDLER; | |
165 punwind->SizeOfProlog = 0; | |
166 punwind->CountOfCodes = 0; | |
167 punwind->FrameRegister = 0; | |
168 punwind->FrameOffset = 0; | |
169 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) - | |
170 (char*)low; | |
171 punwind->ExceptionData[0] = 0; | |
172 | |
173 // This structure describes the covered dynamic code area. | |
174 // Addresses are relative to the beginning on the code cache area | |
175 prt = &pDCD->rt; | |
176 prt->BeginAddress = 0; | |
177 prt->EndAddress = (ULONG)(high - low); | |
178 prt->UnwindData = ((char *)punwind - low); | |
179 | |
180 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low), | |
181 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable"); | |
182 | |
183 #endif // AMD64 | |
184 return true; | |
185 } | |
186 | |
187 void os::initialize_thread() { | |
188 // Nothing to do. | |
189 } | |
190 | |
191 // Atomics and Stub Functions | |
192 | |
193 typedef jint xchg_func_t (jint, volatile jint*); | |
194 typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*); | |
195 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); | |
196 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong); | |
197 typedef jint add_func_t (jint, volatile jint*); | |
198 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*); | |
199 | |
200 #ifdef AMD64 | |
201 | |
202 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { | |
203 // try to use the stub: | |
204 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); | |
205 | |
206 if (func != NULL) { | |
207 os::atomic_xchg_func = func; | |
208 return (*func)(exchange_value, dest); | |
209 } | |
210 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
211 | |
212 jint old_value = *dest; | |
213 *dest = exchange_value; | |
214 return old_value; | |
215 } | |
216 | |
217 intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) { | |
218 // try to use the stub: | |
219 xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry()); | |
220 | |
221 if (func != NULL) { | |
222 os::atomic_xchg_ptr_func = func; | |
223 return (*func)(exchange_value, dest); | |
224 } | |
225 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
226 | |
227 intptr_t old_value = *dest; | |
228 *dest = exchange_value; | |
229 return old_value; | |
230 } | |
231 | |
232 | |
233 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { | |
234 // try to use the stub: | |
235 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); | |
236 | |
237 if (func != NULL) { | |
238 os::atomic_cmpxchg_func = func; | |
239 return (*func)(exchange_value, dest, compare_value); | |
240 } | |
241 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
242 | |
243 jint old_value = *dest; | |
244 if (old_value == compare_value) | |
245 *dest = exchange_value; | |
246 return old_value; | |
247 } | |
248 #endif // AMD64 | |
249 | |
250 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { | |
251 // try to use the stub: | |
252 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); | |
253 | |
254 if (func != NULL) { | |
255 os::atomic_cmpxchg_long_func = func; | |
256 return (*func)(exchange_value, dest, compare_value); | |
257 } | |
258 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
259 | |
260 jlong old_value = *dest; | |
261 if (old_value == compare_value) | |
262 *dest = exchange_value; | |
263 return old_value; | |
264 } | |
265 | |
266 #ifdef AMD64 | |
267 | |
268 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { | |
269 // try to use the stub: | |
270 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); | |
271 | |
272 if (func != NULL) { | |
273 os::atomic_add_func = func; | |
274 return (*func)(add_value, dest); | |
275 } | |
276 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
277 | |
278 return (*dest) += add_value; | |
279 } | |
280 | |
281 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) { | |
282 // try to use the stub: | |
283 add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry()); | |
284 | |
285 if (func != NULL) { | |
286 os::atomic_add_ptr_func = func; | |
287 return (*func)(add_value, dest); | |
288 } | |
289 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
290 | |
291 return (*dest) += add_value; | |
292 } | |
293 | |
294 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; | |
295 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap; | |
296 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; | |
297 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; | |
298 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap; | |
299 | |
300 #endif // AMD64 | |
301 | |
302 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; | |
303 | |
304 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
305 intptr_t** ret_sp, intptr_t** ret_fp) { | |
306 | |
307 ExtendedPC epc; | |
308 CONTEXT* uc = (CONTEXT*)ucVoid; | |
309 | |
310 if (uc != NULL) { | |
311 epc = ExtendedPC((address)uc->REG_PC); | |
312 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP; | |
313 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP; | |
314 } else { | |
315 // construct empty ExtendedPC for return value checking | |
316 epc = ExtendedPC(NULL); | |
317 if (ret_sp) *ret_sp = (intptr_t *)NULL; | |
318 if (ret_fp) *ret_fp = (intptr_t *)NULL; | |
319 } | |
320 | |
321 return epc; | |
322 } | |
323 | |
324 frame os::fetch_frame_from_context(void* ucVoid) { | |
325 intptr_t* sp; | |
326 intptr_t* fp; | |
327 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
328 return frame(sp, fp, epc.pc()); | |
329 } | |
330 | |
331 // VC++ does not save frame pointer on stack in optimized build. It | |
332 // can be turned off by /Oy-. If we really want to walk C frames, | |
333 // we can use the StackWalk() API. | |
334 frame os::get_sender_for_C_frame(frame* fr) { | |
335 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
336 } | |
337 | |
338 | |
339 #ifndef AMD64 | |
340 intptr_t* _get_previous_fp() { | |
341 intptr_t **frameptr; | |
342 __asm { | |
343 mov frameptr, ebp | |
344 }; | |
345 return *frameptr; | |
346 } | |
347 #endif // !AMD64 | |
348 | |
349 frame os::current_frame() { | |
350 | |
351 #ifdef AMD64 | |
352 // apparently _asm not supported on windows amd64 | |
353 typedef intptr_t* get_fp_func (); | |
354 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*, | |
304 | 355 StubRoutines::x86::get_previous_fp_entry()); |
0 | 356 if (func == NULL) return frame(NULL, NULL, NULL); |
357 intptr_t* fp = (*func)(); | |
358 #else | |
359 intptr_t* fp = _get_previous_fp(); | |
360 #endif // AMD64 | |
361 | |
362 frame myframe((intptr_t*)os::current_stack_pointer(), | |
363 (intptr_t*)fp, | |
364 CAST_FROM_FN_PTR(address, os::current_frame)); | |
365 if (os::is_first_C_frame(&myframe)) { | |
366 // stack is not walkable | |
367 return frame(NULL, NULL, NULL); | |
368 } else { | |
369 return os::get_sender_for_C_frame(&myframe); | |
370 } | |
371 } | |
372 | |
373 void os::print_context(outputStream *st, void *context) { | |
374 if (context == NULL) return; | |
375 | |
376 CONTEXT* uc = (CONTEXT*)context; | |
377 | |
378 st->print_cr("Registers:"); | |
379 #ifdef AMD64 | |
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380 st->print( "RAX=" INTPTR_FORMAT, uc->Rax); |
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381 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx); |
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382 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx); |
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383 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx); |
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384 st->cr(); |
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385 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp); |
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386 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp); |
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387 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi); |
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388 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi); |
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389 st->cr(); |
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390 st->print( "R8=" INTPTR_FORMAT, uc->R8); |
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391 st->print(", R9=" INTPTR_FORMAT, uc->R9); |
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392 st->print(", R10=" INTPTR_FORMAT, uc->R10); |
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393 st->print(", R11=" INTPTR_FORMAT, uc->R11); |
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394 st->cr(); |
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395 st->print( "R12=" INTPTR_FORMAT, uc->R12); |
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396 st->print(", R13=" INTPTR_FORMAT, uc->R13); |
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397 st->print(", R14=" INTPTR_FORMAT, uc->R14); |
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398 st->print(", R15=" INTPTR_FORMAT, uc->R15); |
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399 st->cr(); |
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400 st->print( "RIP=" INTPTR_FORMAT, uc->Rip); |
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401 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags); |
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402 |
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403 st->cr(); |
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404 st->cr(); |
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405 |
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406 st->print_cr("Register to memory mapping:"); |
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407 st->cr(); |
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408 |
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409 // this is only for the "general purpose" registers |
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410 |
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411 st->print_cr("RAX=" INTPTR_FORMAT, uc->Rax); |
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412 print_location(st, uc->Rax); |
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413 st->cr(); |
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414 st->print_cr("RBX=" INTPTR_FORMAT, uc->Rbx); |
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415 print_location(st, uc->Rbx); |
0 | 416 st->cr(); |
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417 st->print_cr("RCX=" INTPTR_FORMAT, uc->Rcx); |
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418 print_location(st, uc->Rcx); |
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419 st->cr(); |
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420 st->print_cr("RDX=" INTPTR_FORMAT, uc->Rdx); |
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421 print_location(st, uc->Rdx); |
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422 st->cr(); |
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423 st->print_cr("RSP=" INTPTR_FORMAT, uc->Rsp); |
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424 print_location(st, uc->Rsp); |
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425 st->cr(); |
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426 st->print_cr("RBP=" INTPTR_FORMAT, uc->Rbp); |
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427 print_location(st, uc->Rbp); |
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428 st->cr(); |
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429 st->print_cr("RSI=" INTPTR_FORMAT, uc->Rsi); |
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430 print_location(st, uc->Rsi); |
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431 st->cr(); |
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432 st->print_cr("RDI=" INTPTR_FORMAT, uc->Rdi); |
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433 print_location(st, uc->Rdi); |
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434 st->cr(); |
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435 st->print_cr("R8 =" INTPTR_FORMAT, uc->R8); |
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436 print_location(st, uc->R8); |
0 | 437 st->cr(); |
1681
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438 st->print_cr("R9 =" INTPTR_FORMAT, uc->R9); |
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439 print_location(st, uc->R9); |
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440 st->cr(); |
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441 st->print_cr("R10=" INTPTR_FORMAT, uc->R10); |
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442 print_location(st, uc->R10); |
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443 st->cr(); |
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444 st->print_cr("R11=" INTPTR_FORMAT, uc->R11); |
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445 print_location(st, uc->R11); |
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446 st->cr(); |
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447 st->print_cr("R12=" INTPTR_FORMAT, uc->R12); |
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448 print_location(st, uc->R12); |
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449 st->cr(); |
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450 st->print_cr("R13=" INTPTR_FORMAT, uc->R13); |
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451 print_location(st, uc->R13); |
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452 st->cr(); |
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453 st->print_cr("R14=" INTPTR_FORMAT, uc->R14); |
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454 print_location(st, uc->R14); |
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455 st->cr(); |
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456 st->print_cr("R15=" INTPTR_FORMAT, uc->R15); |
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457 print_location(st, uc->R15); |
0 | 458 #else |
459 st->print( "EAX=" INTPTR_FORMAT, uc->Eax); | |
460 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx); | |
461 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx); | |
462 st->print(", EDX=" INTPTR_FORMAT, uc->Edx); | |
463 st->cr(); | |
464 st->print( "ESP=" INTPTR_FORMAT, uc->Esp); | |
465 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp); | |
466 st->print(", ESI=" INTPTR_FORMAT, uc->Esi); | |
467 st->print(", EDI=" INTPTR_FORMAT, uc->Edi); | |
468 st->cr(); | |
469 st->print( "EIP=" INTPTR_FORMAT, uc->Eip); | |
470 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags); | |
1681
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471 |
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472 st->cr(); |
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473 st->cr(); |
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474 |
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475 st->print_cr("Register to memory mapping:"); |
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476 st->cr(); |
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477 |
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478 // this is only for the "general purpose" registers |
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479 |
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480 st->print_cr("EAX=" INTPTR_FORMAT, uc->Eax); |
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481 print_location(st, uc->Eax); |
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482 st->cr(); |
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483 st->print_cr("EBX=" INTPTR_FORMAT, uc->Ebx); |
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484 print_location(st, uc->Ebx); |
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485 st->cr(); |
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486 st->print_cr("ECX=" INTPTR_FORMAT, uc->Ecx); |
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487 print_location(st, uc->Ecx); |
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488 st->cr(); |
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489 st->print_cr("EDX=" INTPTR_FORMAT, uc->Edx); |
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490 print_location(st, uc->Edx); |
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491 st->cr(); |
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492 st->print_cr("ESP=" INTPTR_FORMAT, uc->Esp); |
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493 print_location(st, uc->Esp); |
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494 st->cr(); |
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495 st->print_cr("EBP=" INTPTR_FORMAT, uc->Ebp); |
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496 print_location(st, uc->Ebp); |
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497 st->cr(); |
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498 st->print_cr("ESI=" INTPTR_FORMAT, uc->Esi); |
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499 print_location(st, uc->Esi); |
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500 st->cr(); |
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501 st->print_cr("EDI=" INTPTR_FORMAT, uc->Edi); |
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502 print_location(st, uc->Edi); |
0 | 503 #endif // AMD64 |
504 st->cr(); | |
505 st->cr(); | |
506 | |
507 intptr_t *sp = (intptr_t *)uc->REG_SP; | |
508 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
509 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); | |
510 st->cr(); | |
511 | |
512 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
513 // point to garbage if entry point in an nmethod is corrupted. Leave | |
514 // this at the end, and hope for the best. | |
515 address pc = (address)uc->REG_PC; | |
516 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
517 print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); | |
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 } |