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 "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 "interpreter/interpreter.hpp"
33 #include "jvm_windows.h"
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.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"
51 #include "runtime/thread.inline.hpp"
52 #include "runtime/timer.hpp"
53 #include "symbolengine.hpp"
54 #include "unwind_windows_x86.hpp"
55 #include "utilities/events.hpp"
56 #include "utilities/vmError.hpp"
57 #include "windbghelp.hpp"
58
59
60 #undef REG_SP
61 #undef REG_FP
62 #undef REG_PC
63 #ifdef AMD64
64 #define REG_SP Rsp
65 #define REG_FP Rbp
66 #define REG_PC Rip
67 #else
68 #define REG_SP Esp
69 #define REG_FP Ebp
70 #define REG_PC Eip
71 #endif // AMD64
72
73 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* );
74
75 // Install a win32 structured exception handler around thread.
76 void os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread) {
77 __try {
78
79 #ifndef AMD64
80 // We store the current thread in this wrapperthread location
81 // and determine how far away this address is from the structured
82 // execption pointer that FS:[0] points to. This get_thread
83 // code can then get the thread pointer via FS.
84 //
85 // Warning: This routine must NEVER be inlined since we'd end up with
86 // multiple offsets.
87 //
88 volatile Thread* wrapperthread = thread;
89
90 if (os::win32::get_thread_ptr_offset() == 0) {
91 int thread_ptr_offset;
92 __asm {
93 lea eax, dword ptr wrapperthread;
94 sub eax, dword ptr FS:[0H];
95 mov thread_ptr_offset, eax
96 };
97 os::win32::set_thread_ptr_offset(thread_ptr_offset);
98 }
99 #ifdef ASSERT
100 // Verify that the offset hasn't changed since we initally captured
101 // it. This might happen if we accidentally ended up with an
102 // inlined version of this routine.
103 else {
104 int test_thread_ptr_offset;
105 __asm {
106 lea eax, dword ptr wrapperthread;
107 sub eax, dword ptr FS:[0H];
108 mov test_thread_ptr_offset, eax
109 };
110 assert(test_thread_ptr_offset == os::win32::get_thread_ptr_offset(),
111 "thread pointer offset from SEH changed");
112 }
113 #endif // ASSERT
114 #endif // !AMD64
115
116 f(value, method, args, thread);
117 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) {
118 // Nothing to do.
119 }
120 }
121
122 #ifdef AMD64
123
124 // This is the language specific handler for exceptions
125 // originating from dynamically generated code.
126 // We call the standard structured exception handler
127 // We only expect Continued Execution since we cannot unwind
128 // from generated code.
129 LONG HandleExceptionFromCodeCache(
130 IN PEXCEPTION_RECORD ExceptionRecord,
131 IN ULONG64 EstablisherFrame,
132 IN OUT PCONTEXT ContextRecord,
133 IN OUT PDISPATCHER_CONTEXT DispatcherContext) {
134 EXCEPTION_POINTERS ep;
135 LONG result;
136
137 ep.ExceptionRecord = ExceptionRecord;
138 ep.ContextRecord = ContextRecord;
139
140 result = topLevelExceptionFilter(&ep);
141
142 // We better only get a CONTINUE_EXECUTION from our handler
143 // since we don't have unwind information registered.
144
145 guarantee( result == EXCEPTION_CONTINUE_EXECUTION,
146 "Unexpected result from topLevelExceptionFilter");
147
148 return(ExceptionContinueExecution);
149 }
150
151
152 // Structure containing the Windows Data Structures required
153 // to register our Code Cache exception handler.
154 // We put these in the CodeCache since the API requires
155 // all addresses in these structures are relative to the Code
156 // area registered with RtlAddFunctionTable.
157 typedef struct {
158 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache
159 RUNTIME_FUNCTION rt;
160 UNWIND_INFO_EH_ONLY unw;
161 } DynamicCodeData, *pDynamicCodeData;
162
163 #endif // AMD64
164 //
165 // Register our CodeCache area with the OS so it will dispatch exceptions
166 // to our topLevelExceptionFilter when we take an exception in our
167 // dynamically generated code.
168 //
169 // Arguments: low and high are the address of the full reserved
170 // codeCache area
171 //
172 bool os::register_code_area(char *low, char *high) {
173 #ifdef AMD64
174
175 ResourceMark rm;
176
177 pDynamicCodeData pDCD;
178 PRUNTIME_FUNCTION prt;
179 PUNWIND_INFO_EH_ONLY punwind;
180
181 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData));
182 CodeBuffer cb(blob);
183 MacroAssembler* masm = new MacroAssembler(&cb);
184 pDCD = (pDynamicCodeData) masm->pc();
185
186 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache));
187 masm->flush();
188
189 // Create an Unwind Structure specifying no unwind info
190 // other than an Exception Handler
191 punwind = &pDCD->unw;
192 punwind->Version = 1;
193 punwind->Flags = UNW_FLAG_EHANDLER;
194 punwind->SizeOfProlog = 0;
195 punwind->CountOfCodes = 0;
196 punwind->FrameRegister = 0;
197 punwind->FrameOffset = 0;
198 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) -
199 (char*)low;
200 punwind->ExceptionData[0] = 0;
201
202 // This structure describes the covered dynamic code area.
203 // Addresses are relative to the beginning on the code cache area
204 prt = &pDCD->rt;
205 prt->BeginAddress = 0;
206 prt->EndAddress = (ULONG)(high - low);
207 prt->UnwindData = ((char *)punwind - low);
208
209 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low),
210 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable");
211
212 #endif // AMD64
213 return true;
214 }
215
216 void os::initialize_thread(Thread* thr) {
217 // Nothing to do.
218 }
219
220 // Atomics and Stub Functions
221
222 typedef jint xchg_func_t (jint, volatile jint*);
223 typedef intptr_t xchg_long_func_t (jlong, volatile jlong*);
224 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
225 typedef jbyte cmpxchg_byte_func_t (jbyte, volatile jbyte*, jbyte);
226 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong);
227 typedef jint add_func_t (jint, volatile jint*);
228 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*);
229
230 #ifdef AMD64
231
232 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
233 // try to use the stub:
234 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
235
236 if (func != NULL) {
237 os::atomic_xchg_func = func;
238 return (*func)(exchange_value, dest);
239 }
240 assert(Threads::number_of_threads() == 0, "for bootstrap only");
241
242 jint old_value = *dest;
243 *dest = exchange_value;
244 return old_value;
245 }
246
247 intptr_t os::atomic_xchg_long_bootstrap(jlong exchange_value, volatile jlong* dest) {
248 // try to use the stub:
249 xchg_long_func_t* func = CAST_TO_FN_PTR(xchg_long_func_t*, StubRoutines::atomic_xchg_long_entry());
250
251 if (func != NULL) {
252 os::atomic_xchg_long_func = func;
253 return (*func)(exchange_value, dest);
254 }
255 assert(Threads::number_of_threads() == 0, "for bootstrap only");
256
257 intptr_t old_value = *dest;
258 *dest = exchange_value;
259 return old_value;
260 }
261
262
263 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
264 // try to use the stub:
265 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
266
267 if (func != NULL) {
268 os::atomic_cmpxchg_func = func;
269 return (*func)(exchange_value, dest, compare_value);
270 }
271 assert(Threads::number_of_threads() == 0, "for bootstrap only");
272
273 jint old_value = *dest;
274 if (old_value == compare_value)
275 *dest = exchange_value;
276 return old_value;
277 }
278
279 jbyte os::atomic_cmpxchg_byte_bootstrap(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
280 // try to use the stub:
281 cmpxchg_byte_func_t* func = CAST_TO_FN_PTR(cmpxchg_byte_func_t*, StubRoutines::atomic_cmpxchg_byte_entry());
282
283 if (func != NULL) {
284 os::atomic_cmpxchg_byte_func = func;
285 return (*func)(exchange_value, dest, compare_value);
286 }
287 assert(Threads::number_of_threads() == 0, "for bootstrap only");
288
289 jbyte old_value = *dest;
290 if (old_value == compare_value)
291 *dest = exchange_value;
292 return old_value;
293 }
294
295 #endif // AMD64
296
297 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
298 // try to use the stub:
299 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
300
301 if (func != NULL) {
302 os::atomic_cmpxchg_long_func = func;
303 return (*func)(exchange_value, dest, compare_value);
304 }
305 assert(Threads::number_of_threads() == 0, "for bootstrap only");
306
307 jlong old_value = *dest;
308 if (old_value == compare_value)
309 *dest = exchange_value;
310 return old_value;
311 }
312
313 #ifdef AMD64
314
315 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
316 // try to use the stub:
317 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
318
319 if (func != NULL) {
320 os::atomic_add_func = func;
321 return (*func)(add_value, dest);
322 }
323 assert(Threads::number_of_threads() == 0, "for bootstrap only");
324
325 return (*dest) += add_value;
326 }
327
328 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) {
329 // try to use the stub:
330 add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry());
331
332 if (func != NULL) {
333 os::atomic_add_ptr_func = func;
334 return (*func)(add_value, dest);
335 }
336 assert(Threads::number_of_threads() == 0, "for bootstrap only");
337
338 return (*dest) += add_value;
339 }
340
341 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
342 xchg_long_func_t* os::atomic_xchg_long_func = os::atomic_xchg_long_bootstrap;
343 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
344 cmpxchg_byte_func_t* os::atomic_cmpxchg_byte_func = os::atomic_cmpxchg_byte_bootstrap;
345 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
346 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap;
347
348 #endif // AMD64
349
350 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
351
352 #ifdef AMD64
353 /*
354 * Windows/x64 does not use stack frames the way expected by Java:
355 * [1] in most cases, there is no frame pointer. All locals are addressed via RSP
356 * [2] in rare cases, when alloca() is used, a frame pointer is used, but this may
357 * not be RBP.
358 * See http://msdn.microsoft.com/en-us/library/ew5tede7.aspx
359 *
360 * So it's not possible to print the native stack using the
361 * while (...) {... fr = os::get_sender_for_C_frame(&fr); }
362 * loop in vmError.cpp. We need to roll our own loop.
363 */
364 bool os::platform_print_native_stack(outputStream* st, const void* context,
365 char *buf, int buf_size)
366 {
367 CONTEXT ctx;
368 if (context != NULL) {
369 memcpy(&ctx, context, sizeof(ctx));
370 } else {
371 RtlCaptureContext(&ctx);
372 }
373
374 st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)");
375
376 STACKFRAME stk;
377 memset(&stk, 0, sizeof(stk));
378 stk.AddrStack.Offset = ctx.Rsp;
379 stk.AddrStack.Mode = AddrModeFlat;
380 stk.AddrFrame.Offset = ctx.Rbp;
381 stk.AddrFrame.Mode = AddrModeFlat;
382 stk.AddrPC.Offset = ctx.Rip;
383 stk.AddrPC.Mode = AddrModeFlat;
384
385 int count = 0;
386 address lastpc = 0;
387 while (count++ < StackPrintLimit) {
388 intptr_t* sp = (intptr_t*)stk.AddrStack.Offset;
389 intptr_t* fp = (intptr_t*)stk.AddrFrame.Offset; // NOT necessarily the same as ctx.Rbp!
390 address pc = (address)stk.AddrPC.Offset;
391
392 if (pc != NULL) {
393 if (count == 2 && lastpc == pc) {
394 // Skip it -- StackWalk64() may return the same PC
395 // (but different SP) on the first try.
396 } else {
397 // Don't try to create a frame(sp, fp, pc) -- on WinX64, stk.AddrFrame
398 // may not contain what Java expects, and may cause the frame() constructor
399 // to crash. Let's just print out the symbolic address.
400 frame::print_C_frame(st, buf, buf_size, pc);
401 // print source file and line, if available
402 char buf[128];
403 int line_no;
404 if (SymbolEngine::get_source_info(pc, buf, sizeof(buf), &line_no)) {
405 st->print(" (%s:%d)", buf, line_no);
406 }
407 st->cr();
408 }
409 lastpc = pc;
410 }
411
412 PVOID p = WindowsDbgHelp::symFunctionTableAccess64(GetCurrentProcess(), stk.AddrPC.Offset);
413 if (!p) {
414 // StackWalk64() can't handle this PC. Calling StackWalk64 again may cause crash.
415 break;
416 }
417
418 BOOL result = WindowsDbgHelp::stackWalk64(
419 IMAGE_FILE_MACHINE_AMD64, // __in DWORD MachineType,
420 GetCurrentProcess(), // __in HANDLE hProcess,
421 GetCurrentThread(), // __in HANDLE hThread,
422 &stk, // __inout LP STACKFRAME64 StackFrame,
423 &ctx); // __inout PVOID ContextRecord,
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(const 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(const 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 // ebp (frameptr) is for this frame (_get_previous_fp). We want the ebp for the
500 // caller of os::current_frame*(), so go up two frames. However, for
501 // optimized builds, _get_previous_fp() will be inlined, so only go
502 // up 1 frame in that case.
503 #ifdef _NMT_NOINLINE_
504 return **(intptr_t***)frameptr;
505 #else
506 return *frameptr;
507 #endif
508 }
509 #endif // !AMD64
510
511 frame os::current_frame() {
512
513 #ifdef AMD64
514 // apparently _asm not supported on windows amd64
515 typedef intptr_t* get_fp_func ();
516 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
517 StubRoutines::x86::get_previous_fp_entry());
518 if (func == NULL) return frame();
519 intptr_t* fp = (*func)();
520 if (fp == NULL) {
521 return frame();
522 }
523 #else
524 intptr_t* fp = _get_previous_fp();
525 #endif // AMD64
526
527 frame myframe((intptr_t*)os::current_stack_pointer(),
528 (intptr_t*)fp,
529 CAST_FROM_FN_PTR(address, os::current_frame));
530 if (os::is_first_C_frame(&myframe)) {
531 // stack is not walkable
532 return frame();
533 } else {
534 return os::get_sender_for_C_frame(&myframe);
535 }
536 }
537
538 void os::print_context(outputStream *st, const void *context) {
539 if (context == NULL) return;
540
541 const CONTEXT* uc = (const CONTEXT*)context;
542
543 st->print_cr("Registers:");
544 #ifdef AMD64
545 st->print( "RAX=" INTPTR_FORMAT, uc->Rax);
546 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx);
547 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx);
548 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx);
549 st->cr();
550 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp);
551 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp);
552 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi);
553 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi);
554 st->cr();
555 st->print( "R8 =" INTPTR_FORMAT, uc->R8);
556 st->print(", R9 =" INTPTR_FORMAT, uc->R9);
557 st->print(", R10=" INTPTR_FORMAT, uc->R10);
558 st->print(", R11=" INTPTR_FORMAT, uc->R11);
559 st->cr();
560 st->print( "R12=" INTPTR_FORMAT, uc->R12);
561 st->print(", R13=" INTPTR_FORMAT, uc->R13);
562 st->print(", R14=" INTPTR_FORMAT, uc->R14);
563 st->print(", R15=" INTPTR_FORMAT, uc->R15);
564 st->cr();
565 st->print( "RIP=" INTPTR_FORMAT, uc->Rip);
566 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
567 #else
568 st->print( "EAX=" INTPTR_FORMAT, uc->Eax);
569 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
570 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
571 st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
572 st->cr();
573 st->print( "ESP=" INTPTR_FORMAT, uc->Esp);
574 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
575 st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
576 st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
577 st->cr();
578 st->print( "EIP=" INTPTR_FORMAT, uc->Eip);
579 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
580 #endif // AMD64
581 st->cr();
582 st->cr();
583
584 intptr_t *sp = (intptr_t *)uc->REG_SP;
585 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
586 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
587 st->cr();
588
589 // Note: it may be unsafe to inspect memory near pc. For example, pc may
590 // point to garbage if entry point in an nmethod is corrupted. Leave
591 // this at the end, and hope for the best.
592 address pc = (address)uc->REG_PC;
593 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
594 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
595 st->cr();
596 }
597
598
599 void os::print_register_info(outputStream *st, const void *context) {
600 if (context == NULL) return;
601
602 const CONTEXT* uc = (const CONTEXT*)context;
603
604 st->print_cr("Register to memory mapping:");
605 st->cr();
606
607 // this is only for the "general purpose" registers
608
609 #ifdef AMD64
610 st->print("RIP="); print_location(st, uc->Rip);
611 st->print("RAX="); print_location(st, uc->Rax);
612 st->print("RBX="); print_location(st, uc->Rbx);
613 st->print("RCX="); print_location(st, uc->Rcx);
614 st->print("RDX="); print_location(st, uc->Rdx);
615 st->print("RSP="); print_location(st, uc->Rsp);
616 st->print("RBP="); print_location(st, uc->Rbp);
617 st->print("RSI="); print_location(st, uc->Rsi);
618 st->print("RDI="); print_location(st, uc->Rdi);
619 st->print("R8 ="); print_location(st, uc->R8);
620 st->print("R9 ="); print_location(st, uc->R9);
621 st->print("R10="); print_location(st, uc->R10);
622 st->print("R11="); print_location(st, uc->R11);
623 st->print("R12="); print_location(st, uc->R12);
624 st->print("R13="); print_location(st, uc->R13);
625 st->print("R14="); print_location(st, uc->R14);
626 st->print("R15="); print_location(st, uc->R15);
627 #else
628 st->print("EIP="); print_location(st, uc->Eip);
629 st->print("EAX="); print_location(st, uc->Eax);
630 st->print("EBX="); print_location(st, uc->Ebx);
631 st->print("ECX="); print_location(st, uc->Ecx);
632 st->print("EDX="); print_location(st, uc->Edx);
633 st->print("ESP="); print_location(st, uc->Esp);
634 st->print("EBP="); print_location(st, uc->Ebp);
635 st->print("ESI="); print_location(st, uc->Esi);
636 st->print("EDI="); print_location(st, uc->Edi);
637 #endif
638
639 st->cr();
640 }
641
642 extern "C" int SpinPause () {
643 #ifdef AMD64
644 return 0 ;
645 #else
646 // pause == rep:nop
647 // On systems that don't support pause a rep:nop
648 // is executed as a nop. The rep: prefix is ignored.
649 _asm {
650 pause ;
651 };
652 return 1 ;
653 #endif // AMD64
654 }
655
656
657 void os::setup_fpu() {
658 #ifndef AMD64
659 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
660 __asm fldcw fpu_cntrl_word;
661 #endif // !AMD64
662 }
663
664 #ifndef PRODUCT
665 void os::verify_stack_alignment() {
666 #ifdef AMD64
667 // The current_stack_pointer() calls generated get_previous_sp stub routine.
668 // Only enable the assert after the routine becomes available.
669 if (StubRoutines::code1() != NULL) {
670 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
671 }
672 #endif
673 }
674 #endif
675
676 int os::extra_bang_size_in_bytes() {
677 // JDK-8050147 requires the full cache line bang for x86.
678 return VM_Version::L1_line_size();
679 }