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 (os::win32::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       os::win32::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 == os::win32::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, const 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(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   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, const void *context) {
 531   if (context == NULL) return;
 532 
 533   const CONTEXT* uc = (const 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, const void *context) {
 592   if (context == NULL) return;
 593 
 594   const CONTEXT* uc = (const 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("RIP="); print_location(st, uc->Rip);
 603   st->print("RAX="); print_location(st, uc->Rax);
 604   st->print("RBX="); print_location(st, uc->Rbx);
 605   st->print("RCX="); print_location(st, uc->Rcx);
 606   st->print("RDX="); print_location(st, uc->Rdx);
 607   st->print("RSP="); print_location(st, uc->Rsp);
 608   st->print("RBP="); print_location(st, uc->Rbp);
 609   st->print("RSI="); print_location(st, uc->Rsi);
 610   st->print("RDI="); print_location(st, uc->Rdi);
 611   st->print("R8 ="); print_location(st, uc->R8);
 612   st->print("R9 ="); print_location(st, uc->R9);
 613   st->print("R10="); print_location(st, uc->R10);
 614   st->print("R11="); print_location(st, uc->R11);
 615   st->print("R12="); print_location(st, uc->R12);
 616   st->print("R13="); print_location(st, uc->R13);
 617   st->print("R14="); print_location(st, uc->R14);
 618   st->print("R15="); print_location(st, uc->R15);
 619 #else
 620   st->print("EIP="); print_location(st, uc->Eip);
 621   st->print("EAX="); print_location(st, uc->Eax);
 622   st->print("EBX="); print_location(st, uc->Ebx);
 623   st->print("ECX="); print_location(st, uc->Ecx);
 624   st->print("EDX="); print_location(st, uc->Edx);
 625   st->print("ESP="); print_location(st, uc->Esp);
 626   st->print("EBP="); print_location(st, uc->Ebp);
 627   st->print("ESI="); print_location(st, uc->Esi);
 628   st->print("EDI="); print_location(st, uc->Edi);
 629 #endif
 630 
 631   st->cr();
 632 }
 633 
 634 extern "C" int SpinPause () {
 635 #ifdef AMD64
 636    return 0 ;
 637 #else
 638    // pause == rep:nop
 639    // On systems that don't support pause a rep:nop
 640    // is executed as a nop.  The rep: prefix is ignored.
 641    _asm {
 642       pause ;
 643    };
 644    return 1 ;
 645 #endif // AMD64
 646 }
 647 
 648 
 649 void os::setup_fpu() {
 650 #ifndef AMD64
 651   int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
 652   __asm fldcw fpu_cntrl_word;
 653 #endif // !AMD64
 654 }
 655 
 656 #ifndef PRODUCT
 657 void os::verify_stack_alignment() {
 658 #ifdef AMD64
 659   // The current_stack_pointer() calls generated get_previous_sp stub routine.
 660   // Only enable the assert after the routine becomes available.
 661   if (StubRoutines::code1() != NULL) {
 662     assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
 663   }
 664 #endif
 665 }
 666 #endif
 667 
 668 int os::extra_bang_size_in_bytes() {
 669   // JDK-8050147 requires the full cache line bang for x86.
 670   return VM_Version::L1_line_size();
 671 }
--- EOF ---