1 /*
   2  * Copyright (c) 1999, 2013, 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, 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 jlong     cmpxchg_long_func_t    (jlong,    volatile jlong*, jlong);
 224 typedef jint      add_func_t             (jint,     volatile jint*);
 225 typedef intptr_t  add_ptr_func_t         (intptr_t, volatile intptr_t*);
 226 
 227 #ifdef AMD64
 228 
 229 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
 230   // try to use the stub:
 231   xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
 232 
 233   if (func != NULL) {
 234     os::atomic_xchg_func = func;
 235     return (*func)(exchange_value, dest);
 236   }
 237   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 238 
 239   jint old_value = *dest;
 240   *dest = exchange_value;
 241   return old_value;
 242 }
 243 
 244 intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) {
 245   // try to use the stub:
 246   xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry());
 247 
 248   if (func != NULL) {
 249     os::atomic_xchg_ptr_func = func;
 250     return (*func)(exchange_value, dest);
 251   }
 252   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 253 
 254   intptr_t old_value = *dest;
 255   *dest = exchange_value;
 256   return old_value;
 257 }
 258 
 259 
 260 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
 261   // try to use the stub:
 262   cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
 263 
 264   if (func != NULL) {
 265     os::atomic_cmpxchg_func = func;
 266     return (*func)(exchange_value, dest, compare_value);
 267   }
 268   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 269 
 270   jint old_value = *dest;
 271   if (old_value == compare_value)
 272     *dest = exchange_value;
 273   return old_value;
 274 }
 275 #endif // AMD64
 276 
 277 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
 278   // try to use the stub:
 279   cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
 280 
 281   if (func != NULL) {
 282     os::atomic_cmpxchg_long_func = func;
 283     return (*func)(exchange_value, dest, compare_value);
 284   }
 285   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 286 
 287   jlong old_value = *dest;
 288   if (old_value == compare_value)
 289     *dest = exchange_value;
 290   return old_value;
 291 }
 292 
 293 #ifdef AMD64
 294 
 295 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
 296   // try to use the stub:
 297   add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
 298 
 299   if (func != NULL) {
 300     os::atomic_add_func = func;
 301     return (*func)(add_value, dest);
 302   }
 303   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 304 
 305   return (*dest) += add_value;
 306 }
 307 
 308 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) {
 309   // try to use the stub:
 310   add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry());
 311 
 312   if (func != NULL) {
 313     os::atomic_add_ptr_func = func;
 314     return (*func)(add_value, dest);
 315   }
 316   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 317 
 318   return (*dest) += add_value;
 319 }
 320 
 321 xchg_func_t*         os::atomic_xchg_func         = os::atomic_xchg_bootstrap;
 322 xchg_ptr_func_t*     os::atomic_xchg_ptr_func     = os::atomic_xchg_ptr_bootstrap;
 323 cmpxchg_func_t*      os::atomic_cmpxchg_func      = os::atomic_cmpxchg_bootstrap;
 324 add_func_t*          os::atomic_add_func          = os::atomic_add_bootstrap;
 325 add_ptr_func_t*      os::atomic_add_ptr_func      = os::atomic_add_ptr_bootstrap;
 326 
 327 #endif // AMD64
 328 
 329 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
 330 
 331 #ifdef AMD64
 332 /*
 333  * Windows/x64 does not use stack frames the way expected by Java:
 334  * [1] in most cases, there is no frame pointer. All locals are addressed via RSP
 335  * [2] in rare cases, when alloca() is used, a frame pointer is used, but this may
 336  *     not be RBP.
 337  * See http://msdn.microsoft.com/en-us/library/ew5tede7.aspx
 338  *
 339  * So it's not possible to print the native stack using the
 340  *     while (...) {...  fr = os::get_sender_for_C_frame(&fr); }
 341  * loop in vmError.cpp. We need to roll our own loop.
 342  */
 343 bool os::platform_print_native_stack(outputStream* st, void* context,
 344                                      char *buf, int buf_size)
 345 {
 346   CONTEXT ctx;
 347   if (context != NULL) {
 348     memcpy(&ctx, context, sizeof(ctx));
 349   } else {
 350     RtlCaptureContext(&ctx);
 351   }
 352 
 353   st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)");
 354 
 355   STACKFRAME stk;
 356   memset(&stk, 0, sizeof(stk));
 357   stk.AddrStack.Offset    = ctx.Rsp;
 358   stk.AddrStack.Mode      = AddrModeFlat;
 359   stk.AddrFrame.Offset    = ctx.Rbp;
 360   stk.AddrFrame.Mode      = AddrModeFlat;
 361   stk.AddrPC.Offset       = ctx.Rip;
 362   stk.AddrPC.Mode         = AddrModeFlat;
 363 
 364   int count = 0;
 365   address lastpc = 0;
 366   while (count++ < StackPrintLimit) {
 367     intptr_t* sp = (intptr_t*)stk.AddrStack.Offset;
 368     intptr_t* fp = (intptr_t*)stk.AddrFrame.Offset; // NOT necessarily the same as ctx.Rbp!
 369     address pc = (address)stk.AddrPC.Offset;
 370 
 371     if (pc != NULL && sp != NULL && fp != NULL) {
 372       if (count == 2 && lastpc == pc) {
 373         // Skip it -- StackWalk64() may return the same PC
 374         // (but different SP) on the first try.
 375       } else {
 376         // Don't try to create a frame(sp, fp, pc) -- on WinX64, stk.AddrFrame
 377         // may not contain what Java expects, and may cause the frame() constructor
 378         // to crash. Let's just print out the symbolic address.
 379         frame::print_C_frame(st, buf, buf_size, pc);
 380         st->cr();
 381       }
 382       lastpc = pc;
 383     } else {
 384       break;
 385     }
 386 
 387     PVOID p = WindowsDbgHelp::SymFunctionTableAccess64(GetCurrentProcess(), stk.AddrPC.Offset);
 388     if (!p) {
 389       // StackWalk64() can't handle this PC. Calling StackWalk64 again may cause crash.
 390       break;
 391     }
 392 
 393     BOOL result = WindowsDbgHelp::StackWalk64(
 394         IMAGE_FILE_MACHINE_AMD64,  // __in      DWORD MachineType,
 395         GetCurrentProcess(),       // __in      HANDLE hProcess,
 396         GetCurrentThread(),        // __in      HANDLE hThread,
 397         &stk,                      // __inout   LP STACKFRAME64 StackFrame,
 398         &ctx,                      // __inout   PVOID ContextRecord,
 399         NULL,                      // __in_opt  PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
 400         WindowsDbgHelp::pfnSymFunctionTableAccess64(),
 401                                    // __in_opt  PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
 402         WindowsDbgHelp::pfnSymGetModuleBase64(),
 403                                    // __in_opt  PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
 404         NULL);                     // __in_opt  PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress
 405 
 406     if (!result) {
 407       break;
 408     }
 409   }
 410   if (count > StackPrintLimit) {
 411     st->print_cr("...<more frames>...");
 412   }
 413   st->cr();
 414 
 415   return true;
 416 }
 417 #endif // AMD64
 418 
 419 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
 420                     intptr_t** ret_sp, intptr_t** ret_fp) {
 421 
 422   ExtendedPC  epc;
 423   CONTEXT* uc = (CONTEXT*)ucVoid;
 424 
 425   if (uc != NULL) {
 426     epc = ExtendedPC((address)uc->REG_PC);
 427     if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
 428     if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
 429   } else {
 430     // construct empty ExtendedPC for return value checking
 431     epc = ExtendedPC(NULL);
 432     if (ret_sp) *ret_sp = (intptr_t *)NULL;
 433     if (ret_fp) *ret_fp = (intptr_t *)NULL;
 434   }
 435 
 436   return epc;
 437 }
 438 
 439 frame os::fetch_frame_from_context(void* ucVoid) {
 440   intptr_t* sp;
 441   intptr_t* fp;
 442   ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
 443   return frame(sp, fp, epc.pc());
 444 }
 445 
 446 // VC++ does not save frame pointer on stack in optimized build. It
 447 // can be turned off by /Oy-. If we really want to walk C frames,
 448 // we can use the StackWalk() API.
 449 frame os::get_sender_for_C_frame(frame* fr) {
 450   return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
 451 }
 452 
 453 #ifndef AMD64
 454 // Returns an estimate of the current stack pointer. Result must be guaranteed
 455 // to point into the calling threads stack, and be no lower than the current
 456 // stack pointer.
 457 address os::current_stack_pointer() {
 458   int dummy;
 459   address sp = (address)&dummy;
 460   return sp;
 461 }
 462 #else
 463 // Returns the current stack pointer. Accurate value needed for
 464 // os::verify_stack_alignment().
 465 address os::current_stack_pointer() {
 466   typedef address get_sp_func();
 467   get_sp_func* func = CAST_TO_FN_PTR(get_sp_func*,
 468                                      StubRoutines::x86::get_previous_sp_entry());
 469   return (*func)();
 470 }
 471 #endif
 472 
 473 
 474 #ifndef AMD64
 475 intptr_t* _get_previous_fp() {
 476   intptr_t **frameptr;
 477   __asm {
 478     mov frameptr, ebp
 479   };
 480   return *frameptr;
 481 }
 482 #endif // !AMD64
 483 
 484 frame os::current_frame() {
 485 
 486 #ifdef AMD64
 487   // apparently _asm not supported on windows amd64
 488   typedef intptr_t*      get_fp_func           ();
 489   get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
 490                                      StubRoutines::x86::get_previous_fp_entry());
 491   if (func == NULL) return frame();
 492   intptr_t* fp = (*func)();
 493   if (fp == NULL) {
 494     return frame();
 495   }
 496 #else
 497   intptr_t* fp = _get_previous_fp();
 498 #endif // AMD64
 499 
 500   frame myframe((intptr_t*)os::current_stack_pointer(),
 501                 (intptr_t*)fp,
 502                 CAST_FROM_FN_PTR(address, os::current_frame));
 503   if (os::is_first_C_frame(&myframe)) {
 504     // stack is not walkable
 505     return frame();
 506   } else {
 507     return os::get_sender_for_C_frame(&myframe);
 508   }
 509 }
 510 
 511 void os::print_context(outputStream *st, void *context) {
 512   if (context == NULL) return;
 513 
 514   CONTEXT* uc = (CONTEXT*)context;
 515 
 516   st->print_cr("Registers:");
 517 #ifdef AMD64
 518   st->print(  "RAX=" INTPTR_FORMAT, uc->Rax);
 519   st->print(", RBX=" INTPTR_FORMAT, uc->Rbx);
 520   st->print(", RCX=" INTPTR_FORMAT, uc->Rcx);
 521   st->print(", RDX=" INTPTR_FORMAT, uc->Rdx);
 522   st->cr();
 523   st->print(  "RSP=" INTPTR_FORMAT, uc->Rsp);
 524   st->print(", RBP=" INTPTR_FORMAT, uc->Rbp);
 525   st->print(", RSI=" INTPTR_FORMAT, uc->Rsi);
 526   st->print(", RDI=" INTPTR_FORMAT, uc->Rdi);
 527   st->cr();
 528   st->print(  "R8 =" INTPTR_FORMAT, uc->R8);
 529   st->print(", R9 =" INTPTR_FORMAT, uc->R9);
 530   st->print(", R10=" INTPTR_FORMAT, uc->R10);
 531   st->print(", R11=" INTPTR_FORMAT, uc->R11);
 532   st->cr();
 533   st->print(  "R12=" INTPTR_FORMAT, uc->R12);
 534   st->print(", R13=" INTPTR_FORMAT, uc->R13);
 535   st->print(", R14=" INTPTR_FORMAT, uc->R14);
 536   st->print(", R15=" INTPTR_FORMAT, uc->R15);
 537   st->cr();
 538   st->print(  "RIP=" INTPTR_FORMAT, uc->Rip);
 539   st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
 540 #else
 541   st->print(  "EAX=" INTPTR_FORMAT, uc->Eax);
 542   st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
 543   st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
 544   st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
 545   st->cr();
 546   st->print(  "ESP=" INTPTR_FORMAT, uc->Esp);
 547   st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
 548   st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
 549   st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
 550   st->cr();
 551   st->print(  "EIP=" INTPTR_FORMAT, uc->Eip);
 552   st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
 553 #endif // AMD64
 554   st->cr();
 555   st->cr();
 556 
 557   intptr_t *sp = (intptr_t *)uc->REG_SP;
 558   st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
 559   print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
 560   st->cr();
 561 
 562   // Note: it may be unsafe to inspect memory near pc. For example, pc may
 563   // point to garbage if entry point in an nmethod is corrupted. Leave
 564   // this at the end, and hope for the best.
 565   address pc = (address)uc->REG_PC;
 566   st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
 567   print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
 568   st->cr();
 569 }
 570 
 571 
 572 void os::print_register_info(outputStream *st, void *context) {
 573   if (context == NULL) return;
 574 
 575   CONTEXT* uc = (CONTEXT*)context;
 576 
 577   st->print_cr("Register to memory mapping:");
 578   st->cr();
 579 
 580   // this is only for the "general purpose" registers
 581 
 582 #ifdef AMD64
 583   st->print("RAX="); print_location(st, uc->Rax);
 584   st->print("RBX="); print_location(st, uc->Rbx);
 585   st->print("RCX="); print_location(st, uc->Rcx);
 586   st->print("RDX="); print_location(st, uc->Rdx);
 587   st->print("RSP="); print_location(st, uc->Rsp);
 588   st->print("RBP="); print_location(st, uc->Rbp);
 589   st->print("RSI="); print_location(st, uc->Rsi);
 590   st->print("RDI="); print_location(st, uc->Rdi);
 591   st->print("R8 ="); print_location(st, uc->R8);
 592   st->print("R9 ="); print_location(st, uc->R9);
 593   st->print("R10="); print_location(st, uc->R10);
 594   st->print("R11="); print_location(st, uc->R11);
 595   st->print("R12="); print_location(st, uc->R12);
 596   st->print("R13="); print_location(st, uc->R13);
 597   st->print("R14="); print_location(st, uc->R14);
 598   st->print("R15="); print_location(st, uc->R15);
 599 #else
 600   st->print("EAX="); print_location(st, uc->Eax);
 601   st->print("EBX="); print_location(st, uc->Ebx);
 602   st->print("ECX="); print_location(st, uc->Ecx);
 603   st->print("EDX="); print_location(st, uc->Edx);
 604   st->print("ESP="); print_location(st, uc->Esp);
 605   st->print("EBP="); print_location(st, uc->Ebp);
 606   st->print("ESI="); print_location(st, uc->Esi);
 607   st->print("EDI="); print_location(st, uc->Edi);
 608 #endif
 609 
 610   st->cr();
 611 }
 612 
 613 extern "C" int SpinPause () {
 614 #ifdef AMD64
 615    return 0 ;
 616 #else
 617    // pause == rep:nop
 618    // On systems that don't support pause a rep:nop
 619    // is executed as a nop.  The rep: prefix is ignored.
 620    _asm {
 621       pause ;
 622    };
 623    return 1 ;
 624 #endif // AMD64
 625 }
 626 
 627 
 628 void os::setup_fpu() {
 629 #ifndef AMD64
 630   int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
 631   __asm fldcw fpu_cntrl_word;
 632 #endif // !AMD64
 633 }
 634 
 635 #ifndef PRODUCT
 636 void os::verify_stack_alignment() {
 637 #ifdef AMD64
 638   assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
 639 #endif
 640 }
 641 #endif
 642 
 643 int os::extra_bang_size_in_bytes() {
 644   // JDK-8050147 requires the full cache line bang for x86.
 645   return VM_Version::L1_line_size();
 646 }
--- EOF ---