1 /*
   2  * Copyright (c) 1999, 2020, 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/frame.inline.hpp"
  42 #include "runtime/interfaceSupport.inline.hpp"
  43 #include "runtime/java.hpp"
  44 #include "runtime/javaCalls.hpp"
  45 #include "runtime/mutexLocker.hpp"
  46 #include "runtime/osThread.hpp"
  47 #include "runtime/sharedRuntime.hpp"
  48 #include "runtime/stubRoutines.hpp"
  49 #include "runtime/thread.inline.hpp"
  50 #include "runtime/timer.hpp"
  51 #include "symbolengine.hpp"
  52 #include "unwind_windows_x86.hpp"
  53 #include "utilities/events.hpp"
  54 #include "utilities/vmError.hpp"
  55 #include "windbghelp.hpp"
  56 
  57 
  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 // Atomics and Stub Functions
 215 
 216 typedef int32_t   xchg_func_t            (int32_t,  volatile int32_t*);
 217 typedef int64_t   xchg_long_func_t       (int64_t,  volatile int64_t*);
 218 typedef int32_t   cmpxchg_func_t         (int32_t,  volatile int32_t*, int32_t);
 219 typedef int8_t    cmpxchg_byte_func_t    (int8_t,   volatile int8_t*,  int8_t);
 220 typedef int64_t   cmpxchg_long_func_t    (int64_t,  volatile int64_t*, int64_t);
 221 typedef int32_t   add_func_t             (int32_t,  volatile int32_t*);
 222 typedef int64_t   add_long_func_t        (int64_t,  volatile int64_t*);
 223 
 224 #ifdef AMD64
 225 
 226 int32_t os::atomic_xchg_bootstrap(int32_t exchange_value, volatile int32_t* dest) {
 227   // try to use the stub:
 228   xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
 229 
 230   if (func != NULL) {
 231     os::atomic_xchg_func = func;
 232     return (*func)(exchange_value, dest);
 233   }
 234   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 235 
 236   int32_t old_value = *dest;
 237   *dest = exchange_value;
 238   return old_value;
 239 }
 240 
 241 int64_t os::atomic_xchg_long_bootstrap(int64_t exchange_value, volatile int64_t* dest) {
 242   // try to use the stub:
 243   xchg_long_func_t* func = CAST_TO_FN_PTR(xchg_long_func_t*, StubRoutines::atomic_xchg_long_entry());
 244 
 245   if (func != NULL) {
 246     os::atomic_xchg_long_func = func;
 247     return (*func)(exchange_value, dest);
 248   }
 249   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 250 
 251   int64_t old_value = *dest;
 252   *dest = exchange_value;
 253   return old_value;
 254 }
 255 
 256 
 257 int32_t os::atomic_cmpxchg_bootstrap(int32_t exchange_value, volatile int32_t* dest, int32_t compare_value) {
 258   // try to use the stub:
 259   cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
 260 
 261   if (func != NULL) {
 262     os::atomic_cmpxchg_func = func;
 263     return (*func)(exchange_value, dest, compare_value);
 264   }
 265   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 266 
 267   int32_t old_value = *dest;
 268   if (old_value == compare_value)
 269     *dest = exchange_value;
 270   return old_value;
 271 }
 272 
 273 int8_t os::atomic_cmpxchg_byte_bootstrap(int8_t exchange_value, volatile int8_t* dest, int8_t compare_value) {
 274   // try to use the stub:
 275   cmpxchg_byte_func_t* func = CAST_TO_FN_PTR(cmpxchg_byte_func_t*, StubRoutines::atomic_cmpxchg_byte_entry());
 276 
 277   if (func != NULL) {
 278     os::atomic_cmpxchg_byte_func = func;
 279     return (*func)(exchange_value, dest, compare_value);
 280   }
 281   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 282 
 283   int8_t old_value = *dest;
 284   if (old_value == compare_value)
 285     *dest = exchange_value;
 286   return old_value;
 287 }
 288 
 289 #endif // AMD64
 290 
 291 int64_t os::atomic_cmpxchg_long_bootstrap(int64_t exchange_value, volatile int64_t* dest, int64_t compare_value) {
 292   // try to use the stub:
 293   cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
 294 
 295   if (func != NULL) {
 296     os::atomic_cmpxchg_long_func = func;
 297     return (*func)(exchange_value, dest, compare_value);
 298   }
 299   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 300 
 301   int64_t old_value = *dest;
 302   if (old_value == compare_value)
 303     *dest = exchange_value;
 304   return old_value;
 305 }
 306 
 307 #ifdef AMD64
 308 
 309 int32_t os::atomic_add_bootstrap(int32_t add_value, volatile int32_t* dest) {
 310   // try to use the stub:
 311   add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
 312 
 313   if (func != NULL) {
 314     os::atomic_add_func = func;
 315     return (*func)(add_value, dest);
 316   }
 317   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 318 
 319   return (*dest) += add_value;
 320 }
 321 
 322 int64_t os::atomic_add_long_bootstrap(int64_t add_value, volatile int64_t* dest) {
 323   // try to use the stub:
 324   add_long_func_t* func = CAST_TO_FN_PTR(add_long_func_t*, StubRoutines::atomic_add_long_entry());
 325 
 326   if (func != NULL) {
 327     os::atomic_add_long_func = func;
 328     return (*func)(add_value, dest);
 329   }
 330   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 331 
 332   return (*dest) += add_value;
 333 }
 334 
 335 xchg_func_t*         os::atomic_xchg_func         = os::atomic_xchg_bootstrap;
 336 xchg_long_func_t*    os::atomic_xchg_long_func    = os::atomic_xchg_long_bootstrap;
 337 cmpxchg_func_t*      os::atomic_cmpxchg_func      = os::atomic_cmpxchg_bootstrap;
 338 cmpxchg_byte_func_t* os::atomic_cmpxchg_byte_func = os::atomic_cmpxchg_byte_bootstrap;
 339 add_func_t*          os::atomic_add_func          = os::atomic_add_bootstrap;
 340 add_long_func_t*     os::atomic_add_long_func     = os::atomic_add_long_bootstrap;
 341 
 342 #endif // AMD64
 343 
 344 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
 345 
 346 #ifdef AMD64
 347 /*
 348  * Windows/x64 does not use stack frames the way expected by Java:
 349  * [1] in most cases, there is no frame pointer. All locals are addressed via RSP
 350  * [2] in rare cases, when alloca() is used, a frame pointer is used, but this may
 351  *     not be RBP.
 352  * See http://msdn.microsoft.com/en-us/library/ew5tede7.aspx
 353  *
 354  * So it's not possible to print the native stack using the
 355  *     while (...) {...  fr = os::get_sender_for_C_frame(&fr); }
 356  * loop in vmError.cpp. We need to roll our own loop.
 357  */
 358 bool os::platform_print_native_stack(outputStream* st, const void* context,
 359                                      char *buf, int buf_size)
 360 {
 361   CONTEXT ctx;
 362   if (context != NULL) {
 363     memcpy(&ctx, context, sizeof(ctx));
 364   } else {
 365     RtlCaptureContext(&ctx);
 366   }
 367 
 368   st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)");
 369 
 370   STACKFRAME stk;
 371   memset(&stk, 0, sizeof(stk));
 372   stk.AddrStack.Offset    = ctx.Rsp;
 373   stk.AddrStack.Mode      = AddrModeFlat;
 374   stk.AddrFrame.Offset    = ctx.Rbp;
 375   stk.AddrFrame.Mode      = AddrModeFlat;
 376   stk.AddrPC.Offset       = ctx.Rip;
 377   stk.AddrPC.Mode         = AddrModeFlat;
 378 
 379   int count = 0;
 380   address lastpc = 0;
 381   while (count++ < StackPrintLimit) {
 382     intptr_t* sp = (intptr_t*)stk.AddrStack.Offset;
 383     intptr_t* fp = (intptr_t*)stk.AddrFrame.Offset; // NOT necessarily the same as ctx.Rbp!
 384     address pc = (address)stk.AddrPC.Offset;
 385 
 386     if (pc != NULL) {
 387       if (count == 2 && lastpc == pc) {
 388         // Skip it -- StackWalk64() may return the same PC
 389         // (but different SP) on the first try.
 390       } else {
 391         // Don't try to create a frame(sp, fp, pc) -- on WinX64, stk.AddrFrame
 392         // may not contain what Java expects, and may cause the frame() constructor
 393         // to crash. Let's just print out the symbolic address.
 394         frame::print_C_frame(st, buf, buf_size, pc);
 395         // print source file and line, if available
 396         char buf[128];
 397         int line_no;
 398         if (SymbolEngine::get_source_info(pc, buf, sizeof(buf), &line_no)) {
 399           st->print("  (%s:%d)", buf, line_no);
 400         }
 401         st->cr();
 402       }
 403       lastpc = pc;
 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 
 419     if (!result) {
 420       break;
 421     }
 422   }
 423   if (count > StackPrintLimit) {
 424     st->print_cr("...<more frames>...");
 425   }
 426   st->cr();
 427 
 428   return true;
 429 }
 430 #endif // AMD64
 431 
 432 address os::fetch_frame_from_context(const void* ucVoid,
 433                     intptr_t** ret_sp, intptr_t** ret_fp) {
 434 
 435   address  epc;
 436   CONTEXT* uc = (CONTEXT*)ucVoid;
 437 
 438   if (uc != NULL) {
 439     epc = (address)uc->REG_PC;
 440     if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
 441     if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
 442   } else {
 443     epc = NULL;
 444     if (ret_sp) *ret_sp = (intptr_t *)NULL;
 445     if (ret_fp) *ret_fp = (intptr_t *)NULL;
 446   }
 447 
 448   return epc;
 449 }
 450 
 451 frame os::fetch_frame_from_context(const void* ucVoid) {
 452   intptr_t* sp;
 453   intptr_t* fp;
 454   address epc = fetch_frame_from_context(ucVoid, &sp, &fp);
 455   return frame(sp, fp, epc);
 456 }
 457 
 458 // VC++ does not save frame pointer on stack in optimized build. It
 459 // can be turned off by /Oy-. If we really want to walk C frames,
 460 // we can use the StackWalk() API.
 461 frame os::get_sender_for_C_frame(frame* fr) {
 462   return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
 463 }
 464 
 465 #ifndef AMD64
 466 // Ignore "C4172: returning address of local variable or temporary" on 32bit
 467 PRAGMA_DIAG_PUSH
 468 PRAGMA_DISABLE_MSVC_WARNING(4172)
 469 // Returns an estimate of the current stack pointer. Result must be guaranteed
 470 // to point into the calling threads stack, and be no lower than the current
 471 // stack pointer.
 472 address os::current_stack_pointer() {
 473   int dummy;
 474   address sp = (address)&dummy;
 475   return sp;
 476 }
 477 PRAGMA_DIAG_POP
 478 #else
 479 // Returns the current stack pointer. Accurate value needed for
 480 // os::verify_stack_alignment().
 481 address os::current_stack_pointer() {
 482   typedef address get_sp_func();
 483   get_sp_func* func = CAST_TO_FN_PTR(get_sp_func*,
 484                                      StubRoutines::x86::get_previous_sp_entry());
 485   return (*func)();
 486 }
 487 #endif
 488 
 489 
 490 #ifndef AMD64
 491 intptr_t* _get_previous_fp() {
 492   intptr_t **frameptr;
 493   __asm {
 494     mov frameptr, ebp
 495   };
 496   // ebp (frameptr) is for this frame (_get_previous_fp). We want the ebp for the
 497   // caller of os::current_frame*(), so go up two frames. However, for
 498   // optimized builds, _get_previous_fp() will be inlined, so only go
 499   // up 1 frame in that case.
 500 #ifdef _NMT_NOINLINE_
 501   return **(intptr_t***)frameptr;
 502 #else
 503   return *frameptr;
 504 #endif
 505 }
 506 #endif // !AMD64
 507 
 508 frame os::current_frame() {
 509 
 510 #ifdef AMD64
 511   // apparently _asm not supported on windows amd64
 512   typedef intptr_t*      get_fp_func           ();
 513   get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
 514                                      StubRoutines::x86::get_previous_fp_entry());
 515   if (func == NULL) return frame();
 516   intptr_t* fp = (*func)();
 517   if (fp == NULL) {
 518     return frame();
 519   }
 520 #else
 521   intptr_t* fp = _get_previous_fp();
 522 #endif // AMD64
 523 
 524   frame myframe((intptr_t*)os::current_stack_pointer(),
 525                 (intptr_t*)fp,
 526                 CAST_FROM_FN_PTR(address, os::current_frame));
 527   if (os::is_first_C_frame(&myframe)) {
 528     // stack is not walkable
 529     return frame();
 530   } else {
 531     return os::get_sender_for_C_frame(&myframe);
 532   }
 533 }
 534 
 535 void os::print_context(outputStream *st, const void *context) {
 536   if (context == NULL) return;
 537 
 538   const CONTEXT* uc = (const CONTEXT*)context;
 539 
 540   st->print_cr("Registers:");
 541 #ifdef AMD64
 542   st->print(  "RAX=" INTPTR_FORMAT, uc->Rax);
 543   st->print(", RBX=" INTPTR_FORMAT, uc->Rbx);
 544   st->print(", RCX=" INTPTR_FORMAT, uc->Rcx);
 545   st->print(", RDX=" INTPTR_FORMAT, uc->Rdx);
 546   st->cr();
 547   st->print(  "RSP=" INTPTR_FORMAT, uc->Rsp);
 548   st->print(", RBP=" INTPTR_FORMAT, uc->Rbp);
 549   st->print(", RSI=" INTPTR_FORMAT, uc->Rsi);
 550   st->print(", RDI=" INTPTR_FORMAT, uc->Rdi);
 551   st->cr();
 552   st->print(  "R8 =" INTPTR_FORMAT, uc->R8);
 553   st->print(", R9 =" INTPTR_FORMAT, uc->R9);
 554   st->print(", R10=" INTPTR_FORMAT, uc->R10);
 555   st->print(", R11=" INTPTR_FORMAT, uc->R11);
 556   st->cr();
 557   st->print(  "R12=" INTPTR_FORMAT, uc->R12);
 558   st->print(", R13=" INTPTR_FORMAT, uc->R13);
 559   st->print(", R14=" INTPTR_FORMAT, uc->R14);
 560   st->print(", R15=" INTPTR_FORMAT, uc->R15);
 561   st->cr();
 562   st->print(  "RIP=" INTPTR_FORMAT, uc->Rip);
 563   st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
 564 #else
 565   st->print(  "EAX=" INTPTR_FORMAT, uc->Eax);
 566   st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
 567   st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
 568   st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
 569   st->cr();
 570   st->print(  "ESP=" INTPTR_FORMAT, uc->Esp);
 571   st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
 572   st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
 573   st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
 574   st->cr();
 575   st->print(  "EIP=" INTPTR_FORMAT, uc->Eip);
 576   st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
 577 #endif // AMD64
 578   st->cr();
 579   st->cr();
 580 
 581   intptr_t *sp = (intptr_t *)uc->REG_SP;
 582   st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
 583   print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
 584   st->cr();
 585 
 586   // Note: it may be unsafe to inspect memory near pc. For example, pc may
 587   // point to garbage if entry point in an nmethod is corrupted. Leave
 588   // this at the end, and hope for the best.
 589   address pc = (address)uc->REG_PC;
 590   print_instructions(st, pc, sizeof(char));
 591   st->cr();
 592 }
 593 
 594 
 595 void os::print_register_info(outputStream *st, const void *context) {
 596   if (context == NULL) return;
 597 
 598   const CONTEXT* uc = (const CONTEXT*)context;
 599 
 600   st->print_cr("Register to memory mapping:");
 601   st->cr();
 602 
 603   // this is only for the "general purpose" registers
 604 
 605 #ifdef AMD64
 606   st->print("RIP="); print_location(st, uc->Rip);
 607   st->print("RAX="); print_location(st, uc->Rax);
 608   st->print("RBX="); print_location(st, uc->Rbx);
 609   st->print("RCX="); print_location(st, uc->Rcx);
 610   st->print("RDX="); print_location(st, uc->Rdx);
 611   st->print("RSP="); print_location(st, uc->Rsp);
 612   st->print("RBP="); print_location(st, uc->Rbp);
 613   st->print("RSI="); print_location(st, uc->Rsi);
 614   st->print("RDI="); print_location(st, uc->Rdi);
 615   st->print("R8 ="); print_location(st, uc->R8);
 616   st->print("R9 ="); print_location(st, uc->R9);
 617   st->print("R10="); print_location(st, uc->R10);
 618   st->print("R11="); print_location(st, uc->R11);
 619   st->print("R12="); print_location(st, uc->R12);
 620   st->print("R13="); print_location(st, uc->R13);
 621   st->print("R14="); print_location(st, uc->R14);
 622   st->print("R15="); print_location(st, uc->R15);
 623 #else
 624   st->print("EIP="); print_location(st, uc->Eip);
 625   st->print("EAX="); print_location(st, uc->Eax);
 626   st->print("EBX="); print_location(st, uc->Ebx);
 627   st->print("ECX="); print_location(st, uc->Ecx);
 628   st->print("EDX="); print_location(st, uc->Edx);
 629   st->print("ESP="); print_location(st, uc->Esp);
 630   st->print("EBP="); print_location(st, uc->Ebp);
 631   st->print("ESI="); print_location(st, uc->Esi);
 632   st->print("EDI="); print_location(st, uc->Edi);
 633 #endif
 634 
 635   st->cr();
 636 }
 637 
 638 extern "C" int SpinPause () {
 639 #ifdef AMD64
 640    return 0 ;
 641 #else
 642    // pause == rep:nop
 643    // On systems that don't support pause a rep:nop
 644    // is executed as a nop.  The rep: prefix is ignored.
 645    _asm {
 646       pause ;
 647    };
 648    return 1 ;
 649 #endif // AMD64
 650 }
 651 

















 652 
 653 void os::setup_fpu() {
 654 #ifndef AMD64
 655   int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
 656   __asm fldcw fpu_cntrl_word;
 657 #endif // !AMD64
 658 }
 659 
 660 #ifndef PRODUCT
 661 void os::verify_stack_alignment() {
 662 #ifdef AMD64
 663   // The current_stack_pointer() calls generated get_previous_sp stub routine.
 664   // Only enable the assert after the routine becomes available.
 665   if (StubRoutines::code1() != NULL) {
 666     assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
 667   }
 668 #endif
 669 }
 670 #endif
 671 
 672 int os::extra_bang_size_in_bytes() {
 673   // JDK-8050147 requires the full cache line bang for x86.
 674   return VM_Version::L1_line_size();
 675 }
--- EOF ---