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 // no precompiled headers
26 #include "jvm.h"
27 #include "asm/macroAssembler.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/icBuffer.hpp"
32 #include "code/vtableStubs.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "nativeInst_x86.hpp"
37 #include "os_share_windows.hpp"
38 #include "prims/jniFastGetField.hpp"
39 #include "prims/jvm_misc.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/extendedPC.hpp"
42 #include "runtime/frame.inline.hpp"
43 #include "runtime/interfaceSupport.inline.hpp"
44 #include "runtime/java.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/mutexLocker.hpp"
47 #include "runtime/osThread.hpp"
48 #include "runtime/sharedRuntime.hpp"
49 #include "runtime/stubRoutines.hpp"
50 #include "runtime/thread.inline.hpp"
51 #include "runtime/timer.hpp"
52 #include "symbolengine.hpp"
53 #include "unwind_windows_x86.hpp"
54 #include "utilities/events.hpp"
55 #include "utilities/vmError.hpp"
56 #include "windbghelp.hpp"
57
58
59 #undef REG_SP
60 #undef REG_FP
61 #undef REG_PC
62 #ifdef AMD64
63 #define REG_SP Rsp
64 #define REG_FP Rbp
65 #define REG_PC Rip
66 #else
67 #define REG_SP Esp
68 #define REG_FP Ebp
69 #define REG_PC Eip
70 #endif // AMD64
71
72 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* );
73
74 // Install a win32 structured exception handler around thread.
75 void os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread) {
76 __try {
77
78 #ifndef AMD64
79 // We store the current thread in this wrapperthread location
80 // and determine how far away this address is from the structured
81 // execption pointer that FS:[0] points to. This get_thread
82 // code can then get the thread pointer via FS.
83 //
84 // Warning: This routine must NEVER be inlined since we'd end up with
85 // multiple offsets.
86 //
87 volatile Thread* wrapperthread = thread;
88
89 if (os::win32::get_thread_ptr_offset() == 0) {
90 int thread_ptr_offset;
91 __asm {
92 lea eax, dword ptr wrapperthread;
93 sub eax, dword ptr FS:[0H];
94 mov thread_ptr_offset, eax
95 };
96 os::win32::set_thread_ptr_offset(thread_ptr_offset);
97 }
98 #ifdef ASSERT
99 // Verify that the offset hasn't changed since we initally captured
100 // it. This might happen if we accidentally ended up with an
101 // inlined version of this routine.
102 else {
103 int test_thread_ptr_offset;
104 __asm {
105 lea eax, dword ptr wrapperthread;
106 sub eax, dword ptr FS:[0H];
107 mov test_thread_ptr_offset, eax
108 };
109 assert(test_thread_ptr_offset == os::win32::get_thread_ptr_offset(),
110 "thread pointer offset from SEH changed");
111 }
112 #endif // ASSERT
113 #endif // !AMD64
114
115 f(value, method, args, thread);
116 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) {
117 // Nothing to do.
118 }
119 }
120
121 #ifdef AMD64
122
123 // This is the language specific handler for exceptions
124 // originating from dynamically generated code.
125 // We call the standard structured exception handler
126 // We only expect Continued Execution since we cannot unwind
127 // from generated code.
128 LONG HandleExceptionFromCodeCache(
129 IN PEXCEPTION_RECORD ExceptionRecord,
130 IN ULONG64 EstablisherFrame,
131 IN OUT PCONTEXT ContextRecord,
132 IN OUT PDISPATCHER_CONTEXT DispatcherContext) {
133 EXCEPTION_POINTERS ep;
134 LONG result;
135
136 ep.ExceptionRecord = ExceptionRecord;
137 ep.ContextRecord = ContextRecord;
138
139 result = topLevelExceptionFilter(&ep);
140
141 // We better only get a CONTINUE_EXECUTION from our handler
142 // since we don't have unwind information registered.
143
144 guarantee( result == EXCEPTION_CONTINUE_EXECUTION,
145 "Unexpected result from topLevelExceptionFilter");
146
147 return(ExceptionContinueExecution);
148 }
149
150
151 // Structure containing the Windows Data Structures required
152 // to register our Code Cache exception handler.
153 // We put these in the CodeCache since the API requires
154 // all addresses in these structures are relative to the Code
155 // area registered with RtlAddFunctionTable.
156 typedef struct {
157 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache
158 RUNTIME_FUNCTION rt;
159 UNWIND_INFO_EH_ONLY unw;
160 } DynamicCodeData, *pDynamicCodeData;
161
162 #endif // AMD64
163 //
164 // Register our CodeCache area with the OS so it will dispatch exceptions
165 // to our topLevelExceptionFilter when we take an exception in our
166 // dynamically generated code.
167 //
168 // Arguments: low and high are the address of the full reserved
169 // codeCache area
170 //
171 bool os::register_code_area(char *low, char *high) {
172 #ifdef AMD64
173
174 ResourceMark rm;
175
176 pDynamicCodeData pDCD;
177 PRUNTIME_FUNCTION prt;
178 PUNWIND_INFO_EH_ONLY punwind;
179
180 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData));
181 CodeBuffer cb(blob);
182 MacroAssembler* masm = new MacroAssembler(&cb);
183 pDCD = (pDynamicCodeData) masm->pc();
184
185 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache));
186 masm->flush();
187
188 // Create an Unwind Structure specifying no unwind info
189 // other than an Exception Handler
190 punwind = &pDCD->unw;
191 punwind->Version = 1;
192 punwind->Flags = UNW_FLAG_EHANDLER;
193 punwind->SizeOfProlog = 0;
194 punwind->CountOfCodes = 0;
195 punwind->FrameRegister = 0;
196 punwind->FrameOffset = 0;
197 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) -
198 (char*)low;
199 punwind->ExceptionData[0] = 0;
200
201 // This structure describes the covered dynamic code area.
202 // Addresses are relative to the beginning on the code cache area
203 prt = &pDCD->rt;
204 prt->BeginAddress = 0;
205 prt->EndAddress = (ULONG)(high - low);
206 prt->UnwindData = ((char *)punwind - low);
207
208 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low),
209 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable");
210
211 #endif // AMD64
212 return true;
213 }
214
215 // Atomics and Stub Functions
216
217 typedef int32_t xchg_func_t (int32_t, volatile int32_t*);
218 typedef int64_t xchg_long_func_t (int64_t, volatile int64_t*);
219 typedef int32_t cmpxchg_func_t (int32_t, volatile int32_t*, int32_t);
220 typedef int8_t cmpxchg_byte_func_t (int8_t, volatile int8_t*, int8_t);
221 typedef int64_t cmpxchg_long_func_t (int64_t, volatile int64_t*, int64_t);
222 typedef int32_t add_func_t (int32_t, volatile int32_t*);
223 typedef int64_t add_long_func_t (int64_t, volatile int64_t*);
224
225 #ifdef AMD64
226
227 int32_t os::atomic_xchg_bootstrap(int32_t exchange_value, volatile int32_t* dest) {
228 // try to use the stub:
229 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
230
231 if (func != NULL) {
232 os::atomic_xchg_func = func;
233 return (*func)(exchange_value, dest);
234 }
235 assert(Threads::number_of_threads() == 0, "for bootstrap only");
236
237 int32_t old_value = *dest;
238 *dest = exchange_value;
239 return old_value;
240 }
241
242 int64_t os::atomic_xchg_long_bootstrap(int64_t exchange_value, volatile int64_t* dest) {
243 // try to use the stub:
244 xchg_long_func_t* func = CAST_TO_FN_PTR(xchg_long_func_t*, StubRoutines::atomic_xchg_long_entry());
245
246 if (func != NULL) {
247 os::atomic_xchg_long_func = func;
248 return (*func)(exchange_value, dest);
249 }
250 assert(Threads::number_of_threads() == 0, "for bootstrap only");
251
252 int64_t old_value = *dest;
253 *dest = exchange_value;
254 return old_value;
255 }
256
257
258 int32_t os::atomic_cmpxchg_bootstrap(int32_t exchange_value, volatile int32_t* dest, int32_t compare_value) {
259 // try to use the stub:
260 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
261
262 if (func != NULL) {
263 os::atomic_cmpxchg_func = func;
264 return (*func)(exchange_value, dest, compare_value);
265 }
266 assert(Threads::number_of_threads() == 0, "for bootstrap only");
267
268 int32_t old_value = *dest;
269 if (old_value == compare_value)
270 *dest = exchange_value;
271 return old_value;
272 }
273
274 int8_t os::atomic_cmpxchg_byte_bootstrap(int8_t exchange_value, volatile int8_t* dest, int8_t compare_value) {
275 // try to use the stub:
276 cmpxchg_byte_func_t* func = CAST_TO_FN_PTR(cmpxchg_byte_func_t*, StubRoutines::atomic_cmpxchg_byte_entry());
277
278 if (func != NULL) {
279 os::atomic_cmpxchg_byte_func = func;
280 return (*func)(exchange_value, dest, compare_value);
281 }
282 assert(Threads::number_of_threads() == 0, "for bootstrap only");
283
284 int8_t old_value = *dest;
285 if (old_value == compare_value)
286 *dest = exchange_value;
287 return old_value;
288 }
289
290 #endif // AMD64
291
292 int64_t os::atomic_cmpxchg_long_bootstrap(int64_t exchange_value, volatile int64_t* dest, int64_t compare_value) {
293 // try to use the stub:
294 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
295
296 if (func != NULL) {
297 os::atomic_cmpxchg_long_func = func;
298 return (*func)(exchange_value, dest, compare_value);
299 }
300 assert(Threads::number_of_threads() == 0, "for bootstrap only");
301
302 int64_t old_value = *dest;
303 if (old_value == compare_value)
304 *dest = exchange_value;
305 return old_value;
306 }
307
308 #ifdef AMD64
309
310 int32_t os::atomic_add_bootstrap(int32_t add_value, volatile int32_t* dest) {
311 // try to use the stub:
312 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
313
314 if (func != NULL) {
315 os::atomic_add_func = func;
316 return (*func)(add_value, dest);
317 }
318 assert(Threads::number_of_threads() == 0, "for bootstrap only");
319
320 return (*dest) += add_value;
321 }
322
323 int64_t os::atomic_add_long_bootstrap(int64_t add_value, volatile int64_t* dest) {
324 // try to use the stub:
325 add_long_func_t* func = CAST_TO_FN_PTR(add_long_func_t*, StubRoutines::atomic_add_long_entry());
326
327 if (func != NULL) {
328 os::atomic_add_long_func = func;
329 return (*func)(add_value, dest);
330 }
331 assert(Threads::number_of_threads() == 0, "for bootstrap only");
332
333 return (*dest) += add_value;
334 }
335
336 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
337 xchg_long_func_t* os::atomic_xchg_long_func = os::atomic_xchg_long_bootstrap;
338 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
339 cmpxchg_byte_func_t* os::atomic_cmpxchg_byte_func = os::atomic_cmpxchg_byte_bootstrap;
340 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
341 add_long_func_t* os::atomic_add_long_func = os::atomic_add_long_bootstrap;
342
343 #endif // AMD64
344
345 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
346
347 #ifdef AMD64
348 /*
349 * Windows/x64 does not use stack frames the way expected by Java:
350 * [1] in most cases, there is no frame pointer. All locals are addressed via RSP
351 * [2] in rare cases, when alloca() is used, a frame pointer is used, but this may
352 * not be RBP.
353 * See http://msdn.microsoft.com/en-us/library/ew5tede7.aspx
354 *
355 * So it's not possible to print the native stack using the
356 * while (...) {... fr = os::get_sender_for_C_frame(&fr); }
357 * loop in vmError.cpp. We need to roll our own loop.
358 */
359 bool os::platform_print_native_stack(outputStream* st, const void* context,
360 char *buf, int buf_size)
361 {
362 CONTEXT ctx;
363 if (context != NULL) {
364 memcpy(&ctx, context, sizeof(ctx));
365 } else {
366 RtlCaptureContext(&ctx);
367 }
368
369 st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)");
370
371 STACKFRAME stk;
372 memset(&stk, 0, sizeof(stk));
373 stk.AddrStack.Offset = ctx.Rsp;
374 stk.AddrStack.Mode = AddrModeFlat;
375 stk.AddrFrame.Offset = ctx.Rbp;
376 stk.AddrFrame.Mode = AddrModeFlat;
377 stk.AddrPC.Offset = ctx.Rip;
378 stk.AddrPC.Mode = AddrModeFlat;
379
380 int count = 0;
381 address lastpc = 0;
382 while (count++ < StackPrintLimit) {
383 intptr_t* sp = (intptr_t*)stk.AddrStack.Offset;
384 intptr_t* fp = (intptr_t*)stk.AddrFrame.Offset; // NOT necessarily the same as ctx.Rbp!
385 address pc = (address)stk.AddrPC.Offset;
386
387 if (pc != NULL) {
388 if (count == 2 && lastpc == pc) {
389 // Skip it -- StackWalk64() may return the same PC
390 // (but different SP) on the first try.
391 } else {
392 // Don't try to create a frame(sp, fp, pc) -- on WinX64, stk.AddrFrame
393 // may not contain what Java expects, and may cause the frame() constructor
394 // to crash. Let's just print out the symbolic address.
395 frame::print_C_frame(st, buf, buf_size, pc);
396 // print source file and line, if available
397 char buf[128];
398 int line_no;
399 if (SymbolEngine::get_source_info(pc, buf, sizeof(buf), &line_no)) {
400 st->print(" (%s:%d)", buf, line_no);
401 }
402 st->cr();
403 }
404 lastpc = pc;
405 }
406
407 PVOID p = WindowsDbgHelp::symFunctionTableAccess64(GetCurrentProcess(), stk.AddrPC.Offset);
408 if (!p) {
409 // StackWalk64() can't handle this PC. Calling StackWalk64 again may cause crash.
410 break;
411 }
412
413 BOOL result = WindowsDbgHelp::stackWalk64(
414 IMAGE_FILE_MACHINE_AMD64, // __in DWORD MachineType,
415 GetCurrentProcess(), // __in HANDLE hProcess,
416 GetCurrentThread(), // __in HANDLE hThread,
417 &stk, // __inout LP STACKFRAME64 StackFrame,
418 &ctx); // __inout PVOID ContextRecord,
419
420 if (!result) {
421 break;
422 }
423 }
424 if (count > StackPrintLimit) {
425 st->print_cr("...<more frames>...");
426 }
427 st->cr();
428
429 return true;
430 }
431 #endif // AMD64
432
433 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
434 intptr_t** ret_sp, intptr_t** ret_fp) {
435
436 ExtendedPC epc;
437 CONTEXT* uc = (CONTEXT*)ucVoid;
438
439 if (uc != NULL) {
440 epc = ExtendedPC((address)uc->REG_PC);
441 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
442 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
443 } else {
444 // construct empty ExtendedPC for return value checking
445 epc = ExtendedPC(NULL);
446 if (ret_sp) *ret_sp = (intptr_t *)NULL;
447 if (ret_fp) *ret_fp = (intptr_t *)NULL;
448 }
449
450 return epc;
451 }
452
453 frame os::fetch_frame_from_context(const void* ucVoid) {
454 intptr_t* sp;
455 intptr_t* fp;
456 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
457 return frame(sp, fp, epc.pc());
458 }
459
460 // VC++ does not save frame pointer on stack in optimized build. It
461 // can be turned off by /Oy-. If we really want to walk C frames,
462 // we can use the StackWalk() API.
463 frame os::get_sender_for_C_frame(frame* fr) {
464 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
465 }
466
467 #ifndef AMD64
468 // Ignore "C4172: returning address of local variable or temporary" on 32bit
469 PRAGMA_DIAG_PUSH
470 PRAGMA_DISABLE_MSVC_WARNING(4172)
471 // Returns an estimate of the current stack pointer. Result must be guaranteed
472 // to point into the calling threads stack, and be no lower than the current
473 // stack pointer.
474 address os::current_stack_pointer() {
475 int dummy;
476 address sp = (address)&dummy;
477 return sp;
478 }
479 PRAGMA_DIAG_POP
480 #else
481 // Returns the current stack pointer. Accurate value needed for
482 // os::verify_stack_alignment().
483 address os::current_stack_pointer() {
484 typedef address get_sp_func();
485 get_sp_func* func = CAST_TO_FN_PTR(get_sp_func*,
486 StubRoutines::x86::get_previous_sp_entry());
487 return (*func)();
488 }
489 #endif
490
491
492 #ifndef AMD64
493 intptr_t* _get_previous_fp() {
494 intptr_t **frameptr;
495 __asm {
496 mov frameptr, ebp
497 };
498 // ebp (frameptr) is for this frame (_get_previous_fp). We want the ebp for the
499 // caller of os::current_frame*(), so go up two frames. However, for
500 // optimized builds, _get_previous_fp() will be inlined, so only go
501 // up 1 frame in that case.
502 #ifdef _NMT_NOINLINE_
503 return **(intptr_t***)frameptr;
504 #else
505 return *frameptr;
506 #endif
507 }
508 #endif // !AMD64
509
510 frame os::current_frame() {
511
512 #ifdef AMD64
513 // apparently _asm not supported on windows amd64
514 typedef intptr_t* get_fp_func ();
515 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
516 StubRoutines::x86::get_previous_fp_entry());
517 if (func == NULL) return frame();
518 intptr_t* fp = (*func)();
519 if (fp == NULL) {
520 return frame();
521 }
522 #else
523 intptr_t* fp = _get_previous_fp();
524 #endif // AMD64
525
526 frame myframe((intptr_t*)os::current_stack_pointer(),
527 (intptr_t*)fp,
528 CAST_FROM_FN_PTR(address, os::current_frame));
529 if (os::is_first_C_frame(&myframe)) {
530 // stack is not walkable
531 return frame();
532 } else {
533 return os::get_sender_for_C_frame(&myframe);
534 }
535 }
536
537 void os::print_context(outputStream *st, const void *context) {
538 if (context == NULL) return;
539
540 const CONTEXT* uc = (const CONTEXT*)context;
541
542 st->print_cr("Registers:");
543 #ifdef AMD64
544 st->print( "RAX=" INTPTR_FORMAT, uc->Rax);
545 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx);
546 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx);
547 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx);
548 st->cr();
549 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp);
550 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp);
551 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi);
552 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi);
553 st->cr();
554 st->print( "R8 =" INTPTR_FORMAT, uc->R8);
555 st->print(", R9 =" INTPTR_FORMAT, uc->R9);
556 st->print(", R10=" INTPTR_FORMAT, uc->R10);
557 st->print(", R11=" INTPTR_FORMAT, uc->R11);
558 st->cr();
559 st->print( "R12=" INTPTR_FORMAT, uc->R12);
560 st->print(", R13=" INTPTR_FORMAT, uc->R13);
561 st->print(", R14=" INTPTR_FORMAT, uc->R14);
562 st->print(", R15=" INTPTR_FORMAT, uc->R15);
563 st->cr();
564 st->print( "RIP=" INTPTR_FORMAT, uc->Rip);
565 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
566 #else
567 st->print( "EAX=" INTPTR_FORMAT, uc->Eax);
568 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
569 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
570 st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
571 st->cr();
572 st->print( "ESP=" INTPTR_FORMAT, uc->Esp);
573 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
574 st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
575 st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
576 st->cr();
577 st->print( "EIP=" INTPTR_FORMAT, uc->Eip);
578 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
579 #endif // AMD64
580 st->cr();
581 st->cr();
582
583 intptr_t *sp = (intptr_t *)uc->REG_SP;
584 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
585 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
586 st->cr();
587
588 // Note: it may be unsafe to inspect memory near pc. For example, pc may
589 // point to garbage if entry point in an nmethod is corrupted. Leave
590 // this at the end, and hope for the best.
591 address pc = (address)uc->REG_PC;
592 print_instructions(st, pc, sizeof(char));
593 st->cr();
594 }
595
596
597 void os::print_register_info(outputStream *st, const void *context) {
598 if (context == NULL) return;
599
600 const CONTEXT* uc = (const CONTEXT*)context;
601
602 st->print_cr("Register to memory mapping:");
603 st->cr();
604
605 // this is only for the "general purpose" registers
606
607 #ifdef AMD64
608 st->print("RIP="); print_location(st, uc->Rip);
609 st->print("RAX="); print_location(st, uc->Rax);
610 st->print("RBX="); print_location(st, uc->Rbx);
611 st->print("RCX="); print_location(st, uc->Rcx);
612 st->print("RDX="); print_location(st, uc->Rdx);
613 st->print("RSP="); print_location(st, uc->Rsp);
614 st->print("RBP="); print_location(st, uc->Rbp);
615 st->print("RSI="); print_location(st, uc->Rsi);
616 st->print("RDI="); print_location(st, uc->Rdi);
617 st->print("R8 ="); print_location(st, uc->R8);
618 st->print("R9 ="); print_location(st, uc->R9);
619 st->print("R10="); print_location(st, uc->R10);
620 st->print("R11="); print_location(st, uc->R11);
621 st->print("R12="); print_location(st, uc->R12);
622 st->print("R13="); print_location(st, uc->R13);
623 st->print("R14="); print_location(st, uc->R14);
624 st->print("R15="); print_location(st, uc->R15);
625 #else
626 st->print("EIP="); print_location(st, uc->Eip);
627 st->print("EAX="); print_location(st, uc->Eax);
628 st->print("EBX="); print_location(st, uc->Ebx);
629 st->print("ECX="); print_location(st, uc->Ecx);
630 st->print("EDX="); print_location(st, uc->Edx);
631 st->print("ESP="); print_location(st, uc->Esp);
632 st->print("EBP="); print_location(st, uc->Ebp);
633 st->print("ESI="); print_location(st, uc->Esi);
634 st->print("EDI="); print_location(st, uc->Edi);
635 #endif
636
637 st->cr();
638 }
639
640 extern "C" int SpinPause () {
641 #ifdef AMD64
642 return 0 ;
643 #else
644 // pause == rep:nop
645 // On systems that don't support pause a rep:nop
646 // is executed as a nop. The rep: prefix is ignored.
647 _asm {
648 pause ;
649 };
650 return 1 ;
651 #endif // AMD64
652 }
653
654
655 void os::setup_fpu() {
656 #ifndef AMD64
657 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
658 __asm fldcw fpu_cntrl_word;
659 #endif // !AMD64
660 }
661
662 #ifndef PRODUCT
663 void os::verify_stack_alignment() {
664 #ifdef AMD64
665 // The current_stack_pointer() calls generated get_previous_sp stub routine.
666 // Only enable the assert after the routine becomes available.
667 if (StubRoutines::code1() != NULL) {
668 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
669 }
670 #endif
671 }
672 #endif
673
674 int os::extra_bang_size_in_bytes() {
675 // JDK-8050147 requires the full cache line bang for x86.
676 return VM_Version::L1_line_size();
677 }