1 /*
2 * Copyright (c) 1999, 2015, 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 // no precompiled headers
26 #include "asm/macroAssembler.hpp"
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 "decoder_windows.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_windows.h"
35 #include "memory/allocation.inline.hpp"
36 #include "mutex_windows.inline.hpp"
37 #include "nativeInst_x86.hpp"
38 #include "os_share_windows.hpp"
39 #include "prims/jniFastGetField.hpp"
40 #include "prims/jvm.h"
41 #include "prims/jvm_misc.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/extendedPC.hpp"
44 #include "runtime/frame.inline.hpp"
45 #include "runtime/interfaceSupport.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/mutexLocker.hpp"
49 #include "runtime/osThread.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "runtime/stubRoutines.hpp"
52 #include "runtime/thread.inline.hpp"
53 #include "runtime/timer.hpp"
54 #include "utilities/events.hpp"
55 #include "utilities/vmError.hpp"
56
57 # include "unwind_windows_x86.hpp"
58 #undef REG_SP
59 #undef REG_FP
60 #undef REG_PC
61 #ifdef AMD64
62 #define REG_SP Rsp
63 #define REG_FP Rbp
64 #define REG_PC Rip
65 #else
66 #define REG_SP Esp
67 #define REG_FP Ebp
68 #define REG_PC Eip
69 #endif // AMD64
70
71 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* );
72
73 // Install a win32 structured exception handler around thread.
74 void os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread) {
75 __try {
76
77 #ifndef AMD64
78 // We store the current thread in this wrapperthread location
79 // and determine how far away this address is from the structured
80 // execption pointer that FS:[0] points to. This get_thread
81 // code can then get the thread pointer via FS.
82 //
83 // Warning: This routine must NEVER be inlined since we'd end up with
84 // multiple offsets.
85 //
86 volatile Thread* wrapperthread = thread;
87
88 if ( ThreadLocalStorage::get_thread_ptr_offset() == 0 ) {
89 int thread_ptr_offset;
90 __asm {
91 lea eax, dword ptr wrapperthread;
92 sub eax, dword ptr FS:[0H];
93 mov thread_ptr_offset, eax
94 };
95 ThreadLocalStorage::set_thread_ptr_offset(thread_ptr_offset);
96 }
97 #ifdef ASSERT
98 // Verify that the offset hasn't changed since we initally captured
99 // it. This might happen if we accidentally ended up with an
100 // inlined version of this routine.
101 else {
102 int test_thread_ptr_offset;
103 __asm {
104 lea eax, dword ptr wrapperthread;
105 sub eax, dword ptr FS:[0H];
106 mov test_thread_ptr_offset, eax
107 };
108 assert(test_thread_ptr_offset == ThreadLocalStorage::get_thread_ptr_offset(),
109 "thread pointer offset from SEH changed");
110 }
111 #endif // ASSERT
112 #endif // !AMD64
113
114 f(value, method, args, thread);
115 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) {
116 // Nothing to do.
117 }
118 }
119
120 #ifdef AMD64
121
122 // This is the language specific handler for exceptions
123 // originating from dynamically generated code.
124 // We call the standard structured exception handler
125 // We only expect Continued Execution since we cannot unwind
126 // from generated code.
127 LONG HandleExceptionFromCodeCache(
128 IN PEXCEPTION_RECORD ExceptionRecord,
129 IN ULONG64 EstablisherFrame,
130 IN OUT PCONTEXT ContextRecord,
131 IN OUT PDISPATCHER_CONTEXT DispatcherContext) {
132 EXCEPTION_POINTERS ep;
133 LONG result;
134
135 ep.ExceptionRecord = ExceptionRecord;
136 ep.ContextRecord = ContextRecord;
137
138 result = topLevelExceptionFilter(&ep);
139
140 // We better only get a CONTINUE_EXECUTION from our handler
141 // since we don't have unwind information registered.
142
143 guarantee( result == EXCEPTION_CONTINUE_EXECUTION,
144 "Unexpected result from topLevelExceptionFilter");
145
146 return(ExceptionContinueExecution);
147 }
148
149
150 // Structure containing the Windows Data Structures required
151 // to register our Code Cache exception handler.
152 // We put these in the CodeCache since the API requires
153 // all addresses in these structures are relative to the Code
154 // area registered with RtlAddFunctionTable.
155 typedef struct {
156 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache
157 RUNTIME_FUNCTION rt;
158 UNWIND_INFO_EH_ONLY unw;
159 } DynamicCodeData, *pDynamicCodeData;
160
161 #endif // AMD64
162 //
163 // Register our CodeCache area with the OS so it will dispatch exceptions
164 // to our topLevelExceptionFilter when we take an exception in our
165 // dynamically generated code.
166 //
167 // Arguments: low and high are the address of the full reserved
168 // codeCache area
169 //
170 bool os::register_code_area(char *low, char *high) {
171 #ifdef AMD64
172
173 ResourceMark rm;
174
175 pDynamicCodeData pDCD;
176 PRUNTIME_FUNCTION prt;
177 PUNWIND_INFO_EH_ONLY punwind;
178
179 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData));
180 CodeBuffer cb(blob);
181 MacroAssembler* masm = new MacroAssembler(&cb);
182 pDCD = (pDynamicCodeData) masm->pc();
183
184 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache));
185 masm->flush();
186
187 // Create an Unwind Structure specifying no unwind info
188 // other than an Exception Handler
189 punwind = &pDCD->unw;
190 punwind->Version = 1;
191 punwind->Flags = UNW_FLAG_EHANDLER;
192 punwind->SizeOfProlog = 0;
193 punwind->CountOfCodes = 0;
194 punwind->FrameRegister = 0;
195 punwind->FrameOffset = 0;
196 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) -
197 (char*)low;
198 punwind->ExceptionData[0] = 0;
199
200 // This structure describes the covered dynamic code area.
201 // Addresses are relative to the beginning on the code cache area
202 prt = &pDCD->rt;
203 prt->BeginAddress = 0;
204 prt->EndAddress = (ULONG)(high - low);
205 prt->UnwindData = ((char *)punwind - low);
206
207 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low),
208 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable");
209
210 #endif // AMD64
211 return true;
212 }
213
214 void os::initialize_thread(Thread* thr) {
215 // Nothing to do.
216 }
217
218 // Atomics and Stub Functions
219
220 typedef jint xchg_func_t (jint, volatile jint*);
221 typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*);
222 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
223 typedef jbyte cmpxchg_byte_func_t (jbyte, volatile jbyte*, jbyte);
224 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong);
225 typedef jint add_func_t (jint, volatile jint*);
226 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*);
227
228 #ifdef AMD64
229
230 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
231 // try to use the stub:
232 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
233
234 if (func != NULL) {
235 os::atomic_xchg_func = func;
236 return (*func)(exchange_value, dest);
237 }
238 assert(Threads::number_of_threads() == 0, "for bootstrap only");
239
240 jint old_value = *dest;
241 *dest = exchange_value;
242 return old_value;
243 }
244
245 intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) {
246 // try to use the stub:
247 xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry());
248
249 if (func != NULL) {
250 os::atomic_xchg_ptr_func = func;
251 return (*func)(exchange_value, dest);
252 }
253 assert(Threads::number_of_threads() == 0, "for bootstrap only");
254
255 intptr_t old_value = *dest;
256 *dest = exchange_value;
257 return old_value;
258 }
259
260
261 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
262 // try to use the stub:
263 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
264
265 if (func != NULL) {
266 os::atomic_cmpxchg_func = func;
267 return (*func)(exchange_value, dest, compare_value);
268 }
269 assert(Threads::number_of_threads() == 0, "for bootstrap only");
270
271 jint old_value = *dest;
272 if (old_value == compare_value)
273 *dest = exchange_value;
274 return old_value;
275 }
276
277 jbyte os::atomic_cmpxchg_byte_bootstrap(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
278 // try to use the stub:
279 cmpxchg_byte_func_t* func = CAST_TO_FN_PTR(cmpxchg_byte_func_t*, StubRoutines::atomic_cmpxchg_byte_entry());
280
281 if (func != NULL) {
282 os::atomic_cmpxchg_byte_func = func;
283 return (*func)(exchange_value, dest, compare_value);
284 }
285 assert(Threads::number_of_threads() == 0, "for bootstrap only");
286
287 jbyte old_value = *dest;
288 if (old_value == compare_value)
289 *dest = exchange_value;
290 return old_value;
291 }
292
293 #endif // AMD64
294
295 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
296 // try to use the stub:
297 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
298
299 if (func != NULL) {
300 os::atomic_cmpxchg_long_func = func;
301 return (*func)(exchange_value, dest, compare_value);
302 }
303 assert(Threads::number_of_threads() == 0, "for bootstrap only");
304
305 jlong old_value = *dest;
306 if (old_value == compare_value)
307 *dest = exchange_value;
308 return old_value;
309 }
310
311 #ifdef AMD64
312
313 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
314 // try to use the stub:
315 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
316
317 if (func != NULL) {
318 os::atomic_add_func = func;
319 return (*func)(add_value, dest);
320 }
321 assert(Threads::number_of_threads() == 0, "for bootstrap only");
322
323 return (*dest) += add_value;
324 }
325
326 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) {
327 // try to use the stub:
328 add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry());
329
330 if (func != NULL) {
331 os::atomic_add_ptr_func = func;
332 return (*func)(add_value, dest);
333 }
334 assert(Threads::number_of_threads() == 0, "for bootstrap only");
335
336 return (*dest) += add_value;
337 }
338
339 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
340 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap;
341 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
342 cmpxchg_byte_func_t* os::atomic_cmpxchg_byte_func = os::atomic_cmpxchg_byte_bootstrap;
343 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
344 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap;
345
346 #endif // AMD64
347
348 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
349
350 #ifdef AMD64
351 /*
352 * Windows/x64 does not use stack frames the way expected by Java:
353 * [1] in most cases, there is no frame pointer. All locals are addressed via RSP
354 * [2] in rare cases, when alloca() is used, a frame pointer is used, but this may
355 * not be RBP.
356 * See http://msdn.microsoft.com/en-us/library/ew5tede7.aspx
357 *
358 * So it's not possible to print the native stack using the
359 * while (...) {... fr = os::get_sender_for_C_frame(&fr); }
360 * loop in vmError.cpp. We need to roll our own loop.
361 */
362 bool os::platform_print_native_stack(outputStream* st, void* context,
363 char *buf, int buf_size)
364 {
365 CONTEXT ctx;
366 if (context != NULL) {
367 memcpy(&ctx, context, sizeof(ctx));
368 } else {
369 RtlCaptureContext(&ctx);
370 }
371
372 st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)");
373
374 STACKFRAME stk;
375 memset(&stk, 0, sizeof(stk));
376 stk.AddrStack.Offset = ctx.Rsp;
377 stk.AddrStack.Mode = AddrModeFlat;
378 stk.AddrFrame.Offset = ctx.Rbp;
379 stk.AddrFrame.Mode = AddrModeFlat;
380 stk.AddrPC.Offset = ctx.Rip;
381 stk.AddrPC.Mode = AddrModeFlat;
382
383 int count = 0;
384 address lastpc = 0;
385 while (count++ < StackPrintLimit) {
386 intptr_t* sp = (intptr_t*)stk.AddrStack.Offset;
387 intptr_t* fp = (intptr_t*)stk.AddrFrame.Offset; // NOT necessarily the same as ctx.Rbp!
388 address pc = (address)stk.AddrPC.Offset;
389
390 if (pc != NULL && sp != NULL && fp != NULL) {
391 if (count == 2 && lastpc == pc) {
392 // Skip it -- StackWalk64() may return the same PC
393 // (but different SP) on the first try.
394 } else {
395 // Don't try to create a frame(sp, fp, pc) -- on WinX64, stk.AddrFrame
396 // may not contain what Java expects, and may cause the frame() constructor
397 // to crash. Let's just print out the symbolic address.
398 frame::print_C_frame(st, buf, buf_size, pc);
399 st->cr();
400 }
401 lastpc = pc;
402 } else {
403 break;
404 }
405
406 PVOID p = WindowsDbgHelp::SymFunctionTableAccess64(GetCurrentProcess(), stk.AddrPC.Offset);
407 if (!p) {
408 // StackWalk64() can't handle this PC. Calling StackWalk64 again may cause crash.
409 break;
410 }
411
412 BOOL result = WindowsDbgHelp::StackWalk64(
413 IMAGE_FILE_MACHINE_AMD64, // __in DWORD MachineType,
414 GetCurrentProcess(), // __in HANDLE hProcess,
415 GetCurrentThread(), // __in HANDLE hThread,
416 &stk, // __inout LP STACKFRAME64 StackFrame,
417 &ctx, // __inout PVOID ContextRecord,
418 NULL, // __in_opt PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
419 WindowsDbgHelp::pfnSymFunctionTableAccess64(),
420 // __in_opt PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
421 WindowsDbgHelp::pfnSymGetModuleBase64(),
422 // __in_opt PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
423 NULL); // __in_opt PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress
424
425 if (!result) {
426 break;
427 }
428 }
429 if (count > StackPrintLimit) {
430 st->print_cr("...<more frames>...");
431 }
432 st->cr();
433
434 return true;
435 }
436 #endif // AMD64
437
438 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
439 intptr_t** ret_sp, intptr_t** ret_fp) {
440
441 ExtendedPC epc;
442 CONTEXT* uc = (CONTEXT*)ucVoid;
443
444 if (uc != NULL) {
445 epc = ExtendedPC((address)uc->REG_PC);
446 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
447 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
448 } else {
449 // construct empty ExtendedPC for return value checking
450 epc = ExtendedPC(NULL);
451 if (ret_sp) *ret_sp = (intptr_t *)NULL;
452 if (ret_fp) *ret_fp = (intptr_t *)NULL;
453 }
454
455 return epc;
456 }
457
458 frame os::fetch_frame_from_context(void* ucVoid) {
459 intptr_t* sp;
460 intptr_t* fp;
461 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
462 return frame(sp, fp, epc.pc());
463 }
464
465 // VC++ does not save frame pointer on stack in optimized build. It
466 // can be turned off by /Oy-. If we really want to walk C frames,
467 // we can use the StackWalk() API.
468 frame os::get_sender_for_C_frame(frame* fr) {
469 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
470 }
471
472 #ifndef AMD64
473 // Returns an estimate of the current stack pointer. Result must be guaranteed
474 // to point into the calling threads stack, and be no lower than the current
475 // stack pointer.
476 address os::current_stack_pointer() {
477 int dummy;
478 address sp = (address)&dummy;
479 return sp;
480 }
481 #else
482 // Returns the current stack pointer. Accurate value needed for
483 // os::verify_stack_alignment().
484 address os::current_stack_pointer() {
485 typedef address get_sp_func();
486 get_sp_func* func = CAST_TO_FN_PTR(get_sp_func*,
487 StubRoutines::x86::get_previous_sp_entry());
488 return (*func)();
489 }
490 #endif
491
492
493 #ifndef AMD64
494 intptr_t* _get_previous_fp() {
495 intptr_t **frameptr;
496 __asm {
497 mov frameptr, ebp
498 };
499 return *frameptr;
500 }
501 #endif // !AMD64
502
503 frame os::current_frame() {
504
505 #ifdef AMD64
506 // apparently _asm not supported on windows amd64
507 typedef intptr_t* get_fp_func ();
508 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
509 StubRoutines::x86::get_previous_fp_entry());
510 if (func == NULL) return frame();
511 intptr_t* fp = (*func)();
512 if (fp == NULL) {
513 return frame();
514 }
515 #else
516 intptr_t* fp = _get_previous_fp();
517 #endif // AMD64
518
519 frame myframe((intptr_t*)os::current_stack_pointer(),
520 (intptr_t*)fp,
521 CAST_FROM_FN_PTR(address, os::current_frame));
522 if (os::is_first_C_frame(&myframe)) {
523 // stack is not walkable
524 return frame();
525 } else {
526 return os::get_sender_for_C_frame(&myframe);
527 }
528 }
529
530 void os::print_context(outputStream *st, void *context) {
531 if (context == NULL) return;
532
533 CONTEXT* uc = (CONTEXT*)context;
534
535 st->print_cr("Registers:");
536 #ifdef AMD64
537 st->print( "RAX=" INTPTR_FORMAT, uc->Rax);
538 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx);
539 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx);
540 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx);
541 st->cr();
542 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp);
543 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp);
544 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi);
545 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi);
546 st->cr();
547 st->print( "R8 =" INTPTR_FORMAT, uc->R8);
548 st->print(", R9 =" INTPTR_FORMAT, uc->R9);
549 st->print(", R10=" INTPTR_FORMAT, uc->R10);
550 st->print(", R11=" INTPTR_FORMAT, uc->R11);
551 st->cr();
552 st->print( "R12=" INTPTR_FORMAT, uc->R12);
553 st->print(", R13=" INTPTR_FORMAT, uc->R13);
554 st->print(", R14=" INTPTR_FORMAT, uc->R14);
555 st->print(", R15=" INTPTR_FORMAT, uc->R15);
556 st->cr();
557 st->print( "RIP=" INTPTR_FORMAT, uc->Rip);
558 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
559 #else
560 st->print( "EAX=" INTPTR_FORMAT, uc->Eax);
561 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
562 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
563 st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
564 st->cr();
565 st->print( "ESP=" INTPTR_FORMAT, uc->Esp);
566 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
567 st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
568 st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
569 st->cr();
570 st->print( "EIP=" INTPTR_FORMAT, uc->Eip);
571 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
572 #endif // AMD64
573 st->cr();
574 st->cr();
575
576 intptr_t *sp = (intptr_t *)uc->REG_SP;
577 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
578 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
579 st->cr();
580
581 // Note: it may be unsafe to inspect memory near pc. For example, pc may
582 // point to garbage if entry point in an nmethod is corrupted. Leave
583 // this at the end, and hope for the best.
584 address pc = (address)uc->REG_PC;
585 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
586 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
587 st->cr();
588 }
589
590
591 void os::print_register_info(outputStream *st, void *context) {
592 if (context == NULL) return;
593
594 CONTEXT* uc = (CONTEXT*)context;
595
596 st->print_cr("Register to memory mapping:");
597 st->cr();
598
599 // this is only for the "general purpose" registers
600
601 #ifdef AMD64
602 st->print("RAX="); print_location(st, uc->Rax);
603 st->print("RBX="); print_location(st, uc->Rbx);
604 st->print("RCX="); print_location(st, uc->Rcx);
605 st->print("RDX="); print_location(st, uc->Rdx);
606 st->print("RSP="); print_location(st, uc->Rsp);
607 st->print("RBP="); print_location(st, uc->Rbp);
608 st->print("RSI="); print_location(st, uc->Rsi);
609 st->print("RDI="); print_location(st, uc->Rdi);
610 st->print("R8 ="); print_location(st, uc->R8);
611 st->print("R9 ="); print_location(st, uc->R9);
612 st->print("R10="); print_location(st, uc->R10);
613 st->print("R11="); print_location(st, uc->R11);
614 st->print("R12="); print_location(st, uc->R12);
615 st->print("R13="); print_location(st, uc->R13);
616 st->print("R14="); print_location(st, uc->R14);
617 st->print("R15="); print_location(st, uc->R15);
618 #else
619 st->print("EAX="); print_location(st, uc->Eax);
620 st->print("EBX="); print_location(st, uc->Ebx);
621 st->print("ECX="); print_location(st, uc->Ecx);
622 st->print("EDX="); print_location(st, uc->Edx);
623 st->print("ESP="); print_location(st, uc->Esp);
624 st->print("EBP="); print_location(st, uc->Ebp);
625 st->print("ESI="); print_location(st, uc->Esi);
626 st->print("EDI="); print_location(st, uc->Edi);
627 #endif
628
629 st->cr();
630 }
631
632 extern "C" int SpinPause () {
633 #ifdef AMD64
634 return 0 ;
635 #else
636 // pause == rep:nop
637 // On systems that don't support pause a rep:nop
638 // is executed as a nop. The rep: prefix is ignored.
639 _asm {
640 pause ;
641 };
642 return 1 ;
643 #endif // AMD64
644 }
645
646
647 void os::setup_fpu() {
648 #ifndef AMD64
649 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
650 __asm fldcw fpu_cntrl_word;
651 #endif // !AMD64
652 }
653
654 #ifndef PRODUCT
655 void os::verify_stack_alignment() {
656 #ifdef AMD64
657 // The current_stack_pointer() calls generated get_previous_sp stub routine.
658 // Only enable the assert after the routine becomes available.
659 if (StubRoutines::code1() != NULL) {
660 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
661 }
662 #endif
663 }
664 #endif
665
666 int os::extra_bang_size_in_bytes() {
667 // JDK-8050147 requires the full cache line bang for x86.
668 return VM_Version::L1_line_size();
669 }