1 /* 2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "jvm.h" 27 #include "asm/macroAssembler.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "code/icBuffer.hpp" 32 #include "code/vtableStubs.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/resourceArea.hpp" 36 #include "nativeInst_x86.hpp" 37 #include "os_share_windows.hpp" 38 #include "prims/jniFastGetField.hpp" 39 #include "prims/jvm_misc.hpp" 40 #include "runtime/arguments.hpp" 41 #include "runtime/extendedPC.hpp" 42 #include "runtime/frame.inline.hpp" 43 #include "runtime/interfaceSupport.inline.hpp" 44 #include "runtime/java.hpp" 45 #include "runtime/javaCalls.hpp" 46 #include "runtime/mutexLocker.hpp" 47 #include "runtime/osThread.hpp" 48 #include "runtime/sharedRuntime.hpp" 49 #include "runtime/stubRoutines.hpp" 50 #include "runtime/thread.inline.hpp" 51 #include "runtime/timer.hpp" 52 #include "symbolengine.hpp" 53 #include "unwind_windows_x86.hpp" 54 #include "utilities/events.hpp" 55 #include "utilities/vmError.hpp" 56 #include "windbghelp.hpp" 57 58 59 #undef REG_SP 60 #undef REG_FP 61 #undef REG_PC 62 #ifdef AMD64 63 #define REG_SP Rsp 64 #define REG_FP Rbp 65 #define REG_PC Rip 66 #else 67 #define REG_SP Esp 68 #define REG_FP Ebp 69 #define REG_PC Eip 70 #endif // AMD64 71 72 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* ); 73 74 // Install a win32 structured exception handler around thread. 75 void os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread) { 76 __try { 77 78 #ifndef AMD64 79 // We store the current thread in this wrapperthread location 80 // and determine how far away this address is from the structured 81 // execption pointer that FS:[0] points to. This get_thread 82 // code can then get the thread pointer via FS. 83 // 84 // Warning: This routine must NEVER be inlined since we'd end up with 85 // multiple offsets. 86 // 87 volatile Thread* wrapperthread = thread; 88 89 if (os::win32::get_thread_ptr_offset() == 0) { 90 int thread_ptr_offset; 91 __asm { 92 lea eax, dword ptr wrapperthread; 93 sub eax, dword ptr FS:[0H]; 94 mov thread_ptr_offset, eax 95 }; 96 os::win32::set_thread_ptr_offset(thread_ptr_offset); 97 } 98 #ifdef ASSERT 99 // Verify that the offset hasn't changed since we initally captured 100 // it. This might happen if we accidentally ended up with an 101 // inlined version of this routine. 102 else { 103 int test_thread_ptr_offset; 104 __asm { 105 lea eax, dword ptr wrapperthread; 106 sub eax, dword ptr FS:[0H]; 107 mov test_thread_ptr_offset, eax 108 }; 109 assert(test_thread_ptr_offset == os::win32::get_thread_ptr_offset(), 110 "thread pointer offset from SEH changed"); 111 } 112 #endif // ASSERT 113 #endif // !AMD64 114 115 f(value, method, args, thread); 116 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { 117 // Nothing to do. 118 } 119 } 120 121 #ifdef AMD64 122 123 // This is the language specific handler for exceptions 124 // originating from dynamically generated code. 125 // We call the standard structured exception handler 126 // We only expect Continued Execution since we cannot unwind 127 // from generated code. 128 LONG HandleExceptionFromCodeCache( 129 IN PEXCEPTION_RECORD ExceptionRecord, 130 IN ULONG64 EstablisherFrame, 131 IN OUT PCONTEXT ContextRecord, 132 IN OUT PDISPATCHER_CONTEXT DispatcherContext) { 133 EXCEPTION_POINTERS ep; 134 LONG result; 135 136 ep.ExceptionRecord = ExceptionRecord; 137 ep.ContextRecord = ContextRecord; 138 139 result = topLevelExceptionFilter(&ep); 140 141 // We better only get a CONTINUE_EXECUTION from our handler 142 // since we don't have unwind information registered. 143 144 guarantee( result == EXCEPTION_CONTINUE_EXECUTION, 145 "Unexpected result from topLevelExceptionFilter"); 146 147 return(ExceptionContinueExecution); 148 } 149 150 151 // Structure containing the Windows Data Structures required 152 // to register our Code Cache exception handler. 153 // We put these in the CodeCache since the API requires 154 // all addresses in these structures are relative to the Code 155 // area registered with RtlAddFunctionTable. 156 typedef struct { 157 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache 158 RUNTIME_FUNCTION rt; 159 UNWIND_INFO_EH_ONLY unw; 160 } DynamicCodeData, *pDynamicCodeData; 161 162 #endif // AMD64 163 // 164 // Register our CodeCache area with the OS so it will dispatch exceptions 165 // to our topLevelExceptionFilter when we take an exception in our 166 // dynamically generated code. 167 // 168 // Arguments: low and high are the address of the full reserved 169 // codeCache area 170 // 171 bool os::register_code_area(char *low, char *high) { 172 #ifdef AMD64 173 174 ResourceMark rm; 175 176 pDynamicCodeData pDCD; 177 PRUNTIME_FUNCTION prt; 178 PUNWIND_INFO_EH_ONLY punwind; 179 180 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData)); 181 CodeBuffer cb(blob); 182 MacroAssembler* masm = new MacroAssembler(&cb); 183 pDCD = (pDynamicCodeData) masm->pc(); 184 185 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache)); 186 masm->flush(); 187 188 // Create an Unwind Structure specifying no unwind info 189 // other than an Exception Handler 190 punwind = &pDCD->unw; 191 punwind->Version = 1; 192 punwind->Flags = UNW_FLAG_EHANDLER; 193 punwind->SizeOfProlog = 0; 194 punwind->CountOfCodes = 0; 195 punwind->FrameRegister = 0; 196 punwind->FrameOffset = 0; 197 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) - 198 (char*)low; 199 punwind->ExceptionData[0] = 0; 200 201 // This structure describes the covered dynamic code area. 202 // Addresses are relative to the beginning on the code cache area 203 prt = &pDCD->rt; 204 prt->BeginAddress = 0; 205 prt->EndAddress = (ULONG)(high - low); 206 prt->UnwindData = ((char *)punwind - low); 207 208 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low), 209 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable"); 210 211 #endif // AMD64 212 return true; 213 } 214 215 void os::initialize_thread(Thread* thr) { 216 // Nothing to do. 217 } 218 219 // Atomics and Stub Functions 220 221 typedef int32_t xchg_func_t (int32_t, volatile int32_t*); 222 typedef int64_t xchg_long_func_t (int64_t, volatile int64_t*); 223 typedef int32_t cmpxchg_func_t (int32_t, volatile int32_t*, int32_t); 224 typedef int8_t cmpxchg_byte_func_t (int8_t, volatile int8_t*, int8_t); 225 typedef int64_t cmpxchg_long_func_t (int64_t, volatile int64_t*, int64_t); 226 typedef int32_t add_func_t (int32_t, volatile int32_t*); 227 typedef int64_t add_long_func_t (int64_t, volatile int64_t*); 228 229 #ifdef AMD64 230 231 int32_t os::atomic_xchg_bootstrap(int32_t exchange_value, volatile int32_t* dest) { 232 // try to use the stub: 233 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); 234 235 if (func != NULL) { 236 os::atomic_xchg_func = func; 237 return (*func)(exchange_value, dest); 238 } 239 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 240 241 int32_t old_value = *dest; 242 *dest = exchange_value; 243 return old_value; 244 } 245 246 int64_t os::atomic_xchg_long_bootstrap(int64_t exchange_value, volatile int64_t* dest) { 247 // try to use the stub: 248 xchg_long_func_t* func = CAST_TO_FN_PTR(xchg_long_func_t*, StubRoutines::atomic_xchg_long_entry()); 249 250 if (func != NULL) { 251 os::atomic_xchg_long_func = func; 252 return (*func)(exchange_value, dest); 253 } 254 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 255 256 int64_t old_value = *dest; 257 *dest = exchange_value; 258 return old_value; 259 } 260 261 262 int32_t os::atomic_cmpxchg_bootstrap(int32_t exchange_value, volatile int32_t* dest, int32_t compare_value) { 263 // try to use the stub: 264 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); 265 266 if (func != NULL) { 267 os::atomic_cmpxchg_func = func; 268 return (*func)(exchange_value, dest, compare_value); 269 } 270 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 271 272 int32_t old_value = *dest; 273 if (old_value == compare_value) 274 *dest = exchange_value; 275 return old_value; 276 } 277 278 int8_t os::atomic_cmpxchg_byte_bootstrap(int8_t exchange_value, volatile int8_t* dest, int8_t compare_value) { 279 // try to use the stub: 280 cmpxchg_byte_func_t* func = CAST_TO_FN_PTR(cmpxchg_byte_func_t*, StubRoutines::atomic_cmpxchg_byte_entry()); 281 282 if (func != NULL) { 283 os::atomic_cmpxchg_byte_func = func; 284 return (*func)(exchange_value, dest, compare_value); 285 } 286 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 287 288 int8_t old_value = *dest; 289 if (old_value == compare_value) 290 *dest = exchange_value; 291 return old_value; 292 } 293 294 #endif // AMD64 295 296 int64_t os::atomic_cmpxchg_long_bootstrap(int64_t exchange_value, volatile int64_t* dest, int64_t compare_value) { 297 // try to use the stub: 298 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); 299 300 if (func != NULL) { 301 os::atomic_cmpxchg_long_func = func; 302 return (*func)(exchange_value, dest, compare_value); 303 } 304 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 305 306 int64_t old_value = *dest; 307 if (old_value == compare_value) 308 *dest = exchange_value; 309 return old_value; 310 } 311 312 #ifdef AMD64 313 314 int32_t os::atomic_add_bootstrap(int32_t add_value, volatile int32_t* dest) { 315 // try to use the stub: 316 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); 317 318 if (func != NULL) { 319 os::atomic_add_func = func; 320 return (*func)(add_value, dest); 321 } 322 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 323 324 return (*dest) += add_value; 325 } 326 327 int64_t os::atomic_add_long_bootstrap(int64_t add_value, volatile int64_t* dest) { 328 // try to use the stub: 329 add_long_func_t* func = CAST_TO_FN_PTR(add_long_func_t*, StubRoutines::atomic_add_long_entry()); 330 331 if (func != NULL) { 332 os::atomic_add_long_func = func; 333 return (*func)(add_value, dest); 334 } 335 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 336 337 return (*dest) += add_value; 338 } 339 340 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; 341 xchg_long_func_t* os::atomic_xchg_long_func = os::atomic_xchg_long_bootstrap; 342 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; 343 cmpxchg_byte_func_t* os::atomic_cmpxchg_byte_func = os::atomic_cmpxchg_byte_bootstrap; 344 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; 345 add_long_func_t* os::atomic_add_long_func = os::atomic_add_long_bootstrap; 346 347 #endif // AMD64 348 349 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; 350 351 #ifdef AMD64 352 /* 353 * Windows/x64 does not use stack frames the way expected by Java: 354 * [1] in most cases, there is no frame pointer. All locals are addressed via RSP 355 * [2] in rare cases, when alloca() is used, a frame pointer is used, but this may 356 * not be RBP. 357 * See http://msdn.microsoft.com/en-us/library/ew5tede7.aspx 358 * 359 * So it's not possible to print the native stack using the 360 * while (...) {... fr = os::get_sender_for_C_frame(&fr); } 361 * loop in vmError.cpp. We need to roll our own loop. 362 */ 363 bool os::platform_print_native_stack(outputStream* st, const void* context, 364 char *buf, int buf_size) 365 { 366 CONTEXT ctx; 367 if (context != NULL) { 368 memcpy(&ctx, context, sizeof(ctx)); 369 } else { 370 RtlCaptureContext(&ctx); 371 } 372 373 st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)"); 374 375 STACKFRAME stk; 376 memset(&stk, 0, sizeof(stk)); 377 stk.AddrStack.Offset = ctx.Rsp; 378 stk.AddrStack.Mode = AddrModeFlat; 379 stk.AddrFrame.Offset = ctx.Rbp; 380 stk.AddrFrame.Mode = AddrModeFlat; 381 stk.AddrPC.Offset = ctx.Rip; 382 stk.AddrPC.Mode = AddrModeFlat; 383 384 int count = 0; 385 address lastpc = 0; 386 while (count++ < StackPrintLimit) { 387 intptr_t* sp = (intptr_t*)stk.AddrStack.Offset; 388 intptr_t* fp = (intptr_t*)stk.AddrFrame.Offset; // NOT necessarily the same as ctx.Rbp! 389 address pc = (address)stk.AddrPC.Offset; 390 391 if (pc != NULL) { 392 if (count == 2 && lastpc == pc) { 393 // Skip it -- StackWalk64() may return the same PC 394 // (but different SP) on the first try. 395 } else { 396 // Don't try to create a frame(sp, fp, pc) -- on WinX64, stk.AddrFrame 397 // may not contain what Java expects, and may cause the frame() constructor 398 // to crash. Let's just print out the symbolic address. 399 frame::print_C_frame(st, buf, buf_size, pc); 400 // print source file and line, if available 401 char buf[128]; 402 int line_no; 403 if (SymbolEngine::get_source_info(pc, buf, sizeof(buf), &line_no)) { 404 st->print(" (%s:%d)", buf, line_no); 405 } 406 st->cr(); 407 } 408 lastpc = pc; 409 } 410 411 PVOID p = WindowsDbgHelp::symFunctionTableAccess64(GetCurrentProcess(), stk.AddrPC.Offset); 412 if (!p) { 413 // StackWalk64() can't handle this PC. Calling StackWalk64 again may cause crash. 414 break; 415 } 416 417 BOOL result = WindowsDbgHelp::stackWalk64( 418 IMAGE_FILE_MACHINE_AMD64, // __in DWORD MachineType, 419 GetCurrentProcess(), // __in HANDLE hProcess, 420 GetCurrentThread(), // __in HANDLE hThread, 421 &stk, // __inout LP STACKFRAME64 StackFrame, 422 &ctx); // __inout PVOID ContextRecord, 423 424 if (!result) { 425 break; 426 } 427 } 428 if (count > StackPrintLimit) { 429 st->print_cr("...<more frames>..."); 430 } 431 st->cr(); 432 433 return true; 434 } 435 #endif // AMD64 436 437 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 438 intptr_t** ret_sp, intptr_t** ret_fp) { 439 440 ExtendedPC epc; 441 CONTEXT* uc = (CONTEXT*)ucVoid; 442 443 if (uc != NULL) { 444 epc = ExtendedPC((address)uc->REG_PC); 445 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP; 446 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP; 447 } else { 448 // construct empty ExtendedPC for return value checking 449 epc = ExtendedPC(NULL); 450 if (ret_sp) *ret_sp = (intptr_t *)NULL; 451 if (ret_fp) *ret_fp = (intptr_t *)NULL; 452 } 453 454 return epc; 455 } 456 457 frame os::fetch_frame_from_context(const void* ucVoid) { 458 intptr_t* sp; 459 intptr_t* fp; 460 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 461 return frame(sp, fp, epc.pc()); 462 } 463 464 // VC++ does not save frame pointer on stack in optimized build. It 465 // can be turned off by /Oy-. If we really want to walk C frames, 466 // we can use the StackWalk() API. 467 frame os::get_sender_for_C_frame(frame* fr) { 468 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 469 } 470 471 #ifndef AMD64 472 // Returns an estimate of the current stack pointer. Result must be guaranteed 473 // to point into the calling threads stack, and be no lower than the current 474 // stack pointer. 475 address os::current_stack_pointer() { 476 int dummy; 477 address sp = (address)&dummy; 478 return sp; 479 } 480 #else 481 // Returns the current stack pointer. Accurate value needed for 482 // os::verify_stack_alignment(). 483 address os::current_stack_pointer() { 484 typedef address get_sp_func(); 485 get_sp_func* func = CAST_TO_FN_PTR(get_sp_func*, 486 StubRoutines::x86::get_previous_sp_entry()); 487 return (*func)(); 488 } 489 #endif 490 491 492 #ifndef AMD64 493 intptr_t* _get_previous_fp() { 494 intptr_t **frameptr; 495 __asm { 496 mov frameptr, ebp 497 }; 498 // ebp (frameptr) is for this frame (_get_previous_fp). We want the ebp for the 499 // caller of os::current_frame*(), so go up two frames. However, for 500 // optimized builds, _get_previous_fp() will be inlined, so only go 501 // up 1 frame in that case. 502 #ifdef _NMT_NOINLINE_ 503 return **(intptr_t***)frameptr; 504 #else 505 return *frameptr; 506 #endif 507 } 508 #endif // !AMD64 509 510 frame os::current_frame() { 511 512 #ifdef AMD64 513 // apparently _asm not supported on windows amd64 514 typedef intptr_t* get_fp_func (); 515 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*, 516 StubRoutines::x86::get_previous_fp_entry()); 517 if (func == NULL) return frame(); 518 intptr_t* fp = (*func)(); 519 if (fp == NULL) { 520 return frame(); 521 } 522 #else 523 intptr_t* fp = _get_previous_fp(); 524 #endif // AMD64 525 526 frame myframe((intptr_t*)os::current_stack_pointer(), 527 (intptr_t*)fp, 528 CAST_FROM_FN_PTR(address, os::current_frame)); 529 if (os::is_first_C_frame(&myframe)) { 530 // stack is not walkable 531 return frame(); 532 } else { 533 return os::get_sender_for_C_frame(&myframe); 534 } 535 } 536 537 void os::print_context(outputStream *st, const void *context) { 538 if (context == NULL) return; 539 540 const CONTEXT* uc = (const CONTEXT*)context; 541 542 st->print_cr("Registers:"); 543 #ifdef AMD64 544 st->print( "RAX=" INTPTR_FORMAT, uc->Rax); 545 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx); 546 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx); 547 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx); 548 st->cr(); 549 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp); 550 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp); 551 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi); 552 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi); 553 st->cr(); 554 st->print( "R8 =" INTPTR_FORMAT, uc->R8); 555 st->print(", R9 =" INTPTR_FORMAT, uc->R9); 556 st->print(", R10=" INTPTR_FORMAT, uc->R10); 557 st->print(", R11=" INTPTR_FORMAT, uc->R11); 558 st->cr(); 559 st->print( "R12=" INTPTR_FORMAT, uc->R12); 560 st->print(", R13=" INTPTR_FORMAT, uc->R13); 561 st->print(", R14=" INTPTR_FORMAT, uc->R14); 562 st->print(", R15=" INTPTR_FORMAT, uc->R15); 563 st->cr(); 564 st->print( "RIP=" INTPTR_FORMAT, uc->Rip); 565 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags); 566 #else 567 st->print( "EAX=" INTPTR_FORMAT, uc->Eax); 568 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx); 569 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx); 570 st->print(", EDX=" INTPTR_FORMAT, uc->Edx); 571 st->cr(); 572 st->print( "ESP=" INTPTR_FORMAT, uc->Esp); 573 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp); 574 st->print(", ESI=" INTPTR_FORMAT, uc->Esi); 575 st->print(", EDI=" INTPTR_FORMAT, uc->Edi); 576 st->cr(); 577 st->print( "EIP=" INTPTR_FORMAT, uc->Eip); 578 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags); 579 #endif // AMD64 580 st->cr(); 581 st->cr(); 582 583 intptr_t *sp = (intptr_t *)uc->REG_SP; 584 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 585 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); 586 st->cr(); 587 588 // Note: it may be unsafe to inspect memory near pc. For example, pc may 589 // point to garbage if entry point in an nmethod is corrupted. Leave 590 // this at the end, and hope for the best. 591 address pc = (address)uc->REG_PC; 592 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); 593 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 594 st->cr(); 595 } 596 597 598 void os::print_register_info(outputStream *st, const void *context) { 599 if (context == NULL) return; 600 601 const CONTEXT* uc = (const CONTEXT*)context; 602 603 st->print_cr("Register to memory mapping:"); 604 st->cr(); 605 606 // this is only for the "general purpose" registers 607 608 #ifdef AMD64 609 st->print("RIP="); print_location(st, uc->Rip); 610 st->print("RAX="); print_location(st, uc->Rax); 611 st->print("RBX="); print_location(st, uc->Rbx); 612 st->print("RCX="); print_location(st, uc->Rcx); 613 st->print("RDX="); print_location(st, uc->Rdx); 614 st->print("RSP="); print_location(st, uc->Rsp); 615 st->print("RBP="); print_location(st, uc->Rbp); 616 st->print("RSI="); print_location(st, uc->Rsi); 617 st->print("RDI="); print_location(st, uc->Rdi); 618 st->print("R8 ="); print_location(st, uc->R8); 619 st->print("R9 ="); print_location(st, uc->R9); 620 st->print("R10="); print_location(st, uc->R10); 621 st->print("R11="); print_location(st, uc->R11); 622 st->print("R12="); print_location(st, uc->R12); 623 st->print("R13="); print_location(st, uc->R13); 624 st->print("R14="); print_location(st, uc->R14); 625 st->print("R15="); print_location(st, uc->R15); 626 #else 627 st->print("EIP="); print_location(st, uc->Eip); 628 st->print("EAX="); print_location(st, uc->Eax); 629 st->print("EBX="); print_location(st, uc->Ebx); 630 st->print("ECX="); print_location(st, uc->Ecx); 631 st->print("EDX="); print_location(st, uc->Edx); 632 st->print("ESP="); print_location(st, uc->Esp); 633 st->print("EBP="); print_location(st, uc->Ebp); 634 st->print("ESI="); print_location(st, uc->Esi); 635 st->print("EDI="); print_location(st, uc->Edi); 636 #endif 637 638 st->cr(); 639 } 640 641 extern "C" int SpinPause () { 642 #ifdef AMD64 643 return 0 ; 644 #else 645 // pause == rep:nop 646 // On systems that don't support pause a rep:nop 647 // is executed as a nop. The rep: prefix is ignored. 648 _asm { 649 pause ; 650 }; 651 return 1 ; 652 #endif // AMD64 653 } 654 655 656 void os::setup_fpu() { 657 #ifndef AMD64 658 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std(); 659 __asm fldcw fpu_cntrl_word; 660 #endif // !AMD64 661 } 662 663 #ifndef PRODUCT 664 void os::verify_stack_alignment() { 665 #ifdef AMD64 666 // The current_stack_pointer() calls generated get_previous_sp stub routine. 667 // Only enable the assert after the routine becomes available. 668 if (StubRoutines::code1() != NULL) { 669 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 670 } 671 #endif 672 } 673 #endif 674 675 int os::extra_bang_size_in_bytes() { 676 // JDK-8050147 requires the full cache line bang for x86. 677 return VM_Version::L1_line_size(); 678 }