1 /*
2 * Copyright (c) 1999, 2010, 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 "assembler_x86.inline.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "jvm_windows.h"
34 #include "memory/allocation.inline.hpp"
35 #include "mutex_windows.inline.hpp"
36 #include "nativeInst_x86.hpp"
37 #include "os_share_windows.hpp"
38 #include "prims/jniFastGetField.hpp"
39 #include "prims/jvm.h"
40 #include "prims/jvm_misc.hpp"
41 #include "runtime/arguments.hpp"
42 #include "runtime/extendedPC.hpp"
43 #include "runtime/frame.inline.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/java.hpp"
46 #include "runtime/javaCalls.hpp"
47 #include "runtime/mutexLocker.hpp"
48 #include "runtime/osThread.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/stubRoutines.hpp"
51 #include "runtime/timer.hpp"
52 #include "thread_windows.inline.hpp"
53 #include "utilities/events.hpp"
54 #include "utilities/vmError.hpp"
55 #ifdef COMPILER1
56 #include "c1/c1_Runtime1.hpp"
57 #endif
58 #ifdef COMPILER2
59 #include "opto/runtime.hpp"
60 #endif
61
62 # include "unwind_windows_x86.hpp"
63 #undef REG_SP
64 #undef REG_FP
65 #undef REG_PC
66 #ifdef AMD64
67 #define REG_SP Rsp
68 #define REG_FP Rbp
69 #define REG_PC Rip
70 #else
71 #define REG_SP Esp
72 #define REG_FP Ebp
73 #define REG_PC Eip
74 #endif // AMD64
75
76 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* );
77
78 // Install a win32 structured exception handler around thread.
79 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
80 __try {
81
82 #ifndef AMD64
83 // We store the current thread in this wrapperthread location
84 // and determine how far away this address is from the structured
85 // execption pointer that FS:[0] points to. This get_thread
86 // code can then get the thread pointer via FS.
87 //
88 // Warning: This routine must NEVER be inlined since we'd end up with
89 // multiple offsets.
90 //
91 volatile Thread* wrapperthread = thread;
92
93 if ( ThreadLocalStorage::get_thread_ptr_offset() == 0 ) {
94 int thread_ptr_offset;
95 __asm {
96 lea eax, dword ptr wrapperthread;
97 sub eax, dword ptr FS:[0H];
98 mov thread_ptr_offset, eax
99 };
100 ThreadLocalStorage::set_thread_ptr_offset(thread_ptr_offset);
101 }
102 #ifdef ASSERT
103 // Verify that the offset hasn't changed since we initally captured
104 // it. This might happen if we accidentally ended up with an
105 // inlined version of this routine.
106 else {
107 int test_thread_ptr_offset;
108 __asm {
109 lea eax, dword ptr wrapperthread;
110 sub eax, dword ptr FS:[0H];
111 mov test_thread_ptr_offset, eax
112 };
113 assert(test_thread_ptr_offset == ThreadLocalStorage::get_thread_ptr_offset(),
114 "thread pointer offset from SEH changed");
115 }
116 #endif // ASSERT
117 #endif // !AMD64
118
119 f(value, method, args, thread);
120 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) {
121 // Nothing to do.
122 }
123 }
124
125 #ifdef AMD64
126
127 // This is the language specific handler for exceptions
128 // originating from dynamically generated code.
129 // We call the standard structured exception handler
130 // We only expect Continued Execution since we cannot unwind
131 // from generated code.
132 LONG HandleExceptionFromCodeCache(
133 IN PEXCEPTION_RECORD ExceptionRecord,
134 IN ULONG64 EstablisherFrame,
135 IN OUT PCONTEXT ContextRecord,
136 IN OUT PDISPATCHER_CONTEXT DispatcherContext) {
137 EXCEPTION_POINTERS ep;
138 LONG result;
139
140 ep.ExceptionRecord = ExceptionRecord;
141 ep.ContextRecord = ContextRecord;
142
143 result = topLevelExceptionFilter(&ep);
144
145 // We better only get a CONTINUE_EXECUTION from our handler
146 // since we don't have unwind information registered.
147
148 guarantee( result == EXCEPTION_CONTINUE_EXECUTION,
149 "Unexpected result from topLevelExceptionFilter");
150
151 return(ExceptionContinueExecution);
152 }
153
154
155 // Structure containing the Windows Data Structures required
156 // to register our Code Cache exception handler.
157 // We put these in the CodeCache since the API requires
158 // all addresses in these structures are relative to the Code
159 // area registered with RtlAddFunctionTable.
160 typedef struct {
161 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache
162 RUNTIME_FUNCTION rt;
163 UNWIND_INFO_EH_ONLY unw;
164 } DynamicCodeData, *pDynamicCodeData;
165
166 #endif // AMD64
167 //
168 // Register our CodeCache area with the OS so it will dispatch exceptions
169 // to our topLevelExceptionFilter when we take an exception in our
170 // dynamically generated code.
171 //
172 // Arguments: low and high are the address of the full reserved
173 // codeCache area
174 //
175 bool os::register_code_area(char *low, char *high) {
176 #ifdef AMD64
177
178 ResourceMark rm;
179
180 pDynamicCodeData pDCD;
181 PRUNTIME_FUNCTION prt;
182 PUNWIND_INFO_EH_ONLY punwind;
183
184 // If we are using Vectored Exceptions we don't need this registration
185 if (UseVectoredExceptions) return true;
186
187 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData));
188 CodeBuffer cb(blob);
189 MacroAssembler* masm = new MacroAssembler(&cb);
190 pDCD = (pDynamicCodeData) masm->pc();
191
192 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache));
193 masm->flush();
194
195 // Create an Unwind Structure specifying no unwind info
196 // other than an Exception Handler
197 punwind = &pDCD->unw;
198 punwind->Version = 1;
199 punwind->Flags = UNW_FLAG_EHANDLER;
200 punwind->SizeOfProlog = 0;
201 punwind->CountOfCodes = 0;
202 punwind->FrameRegister = 0;
203 punwind->FrameOffset = 0;
204 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) -
205 (char*)low;
206 punwind->ExceptionData[0] = 0;
207
208 // This structure describes the covered dynamic code area.
209 // Addresses are relative to the beginning on the code cache area
210 prt = &pDCD->rt;
211 prt->BeginAddress = 0;
212 prt->EndAddress = (ULONG)(high - low);
213 prt->UnwindData = ((char *)punwind - low);
214
215 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low),
216 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable");
217
218 #endif // AMD64
219 return true;
220 }
221
222 void os::initialize_thread() {
223 // Nothing to do.
224 }
225
226 // Atomics and Stub Functions
227
228 typedef jint xchg_func_t (jint, volatile jint*);
229 typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*);
230 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
231 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong);
232 typedef jint add_func_t (jint, volatile jint*);
233 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*);
234
235 #ifdef AMD64
236
237 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
238 // try to use the stub:
239 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
240
241 if (func != NULL) {
242 os::atomic_xchg_func = func;
243 return (*func)(exchange_value, dest);
244 }
245 assert(Threads::number_of_threads() == 0, "for bootstrap only");
246
247 jint old_value = *dest;
248 *dest = exchange_value;
249 return old_value;
250 }
251
252 intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) {
253 // try to use the stub:
254 xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry());
255
256 if (func != NULL) {
257 os::atomic_xchg_ptr_func = func;
258 return (*func)(exchange_value, dest);
259 }
260 assert(Threads::number_of_threads() == 0, "for bootstrap only");
261
262 intptr_t old_value = *dest;
263 *dest = exchange_value;
264 return old_value;
265 }
266
267
268 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
269 // try to use the stub:
270 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
271
272 if (func != NULL) {
273 os::atomic_cmpxchg_func = func;
274 return (*func)(exchange_value, dest, compare_value);
275 }
276 assert(Threads::number_of_threads() == 0, "for bootstrap only");
277
278 jint old_value = *dest;
279 if (old_value == compare_value)
280 *dest = exchange_value;
281 return old_value;
282 }
283 #endif // AMD64
284
285 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
286 // try to use the stub:
287 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
288
289 if (func != NULL) {
290 os::atomic_cmpxchg_long_func = func;
291 return (*func)(exchange_value, dest, compare_value);
292 }
293 assert(Threads::number_of_threads() == 0, "for bootstrap only");
294
295 jlong old_value = *dest;
296 if (old_value == compare_value)
297 *dest = exchange_value;
298 return old_value;
299 }
300
301 #ifdef AMD64
302
303 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
304 // try to use the stub:
305 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
306
307 if (func != NULL) {
308 os::atomic_add_func = func;
309 return (*func)(add_value, dest);
310 }
311 assert(Threads::number_of_threads() == 0, "for bootstrap only");
312
313 return (*dest) += add_value;
314 }
315
316 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) {
317 // try to use the stub:
318 add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry());
319
320 if (func != NULL) {
321 os::atomic_add_ptr_func = func;
322 return (*func)(add_value, dest);
323 }
324 assert(Threads::number_of_threads() == 0, "for bootstrap only");
325
326 return (*dest) += add_value;
327 }
328
329 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
330 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap;
331 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
332 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
333 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap;
334
335 #endif // AMD64
336
337 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
338
339 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
340 intptr_t** ret_sp, intptr_t** ret_fp) {
341
342 ExtendedPC epc;
343 CONTEXT* uc = (CONTEXT*)ucVoid;
344
345 if (uc != NULL) {
346 epc = ExtendedPC((address)uc->REG_PC);
347 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
348 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
349 } else {
350 // construct empty ExtendedPC for return value checking
351 epc = ExtendedPC(NULL);
352 if (ret_sp) *ret_sp = (intptr_t *)NULL;
353 if (ret_fp) *ret_fp = (intptr_t *)NULL;
354 }
355
356 return epc;
357 }
358
359 frame os::fetch_frame_from_context(void* ucVoid) {
360 intptr_t* sp;
361 intptr_t* fp;
362 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
363 return frame(sp, fp, epc.pc());
364 }
365
366 // VC++ does not save frame pointer on stack in optimized build. It
367 // can be turned off by /Oy-. If we really want to walk C frames,
368 // we can use the StackWalk() API.
369 frame os::get_sender_for_C_frame(frame* fr) {
370 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
371 }
372
373 #ifndef AMD64
374 // Returns an estimate of the current stack pointer. Result must be guaranteed
375 // to point into the calling threads stack, and be no lower than the current
376 // stack pointer.
377 address os::current_stack_pointer() {
378 int dummy;
379 address sp = (address)&dummy;
380 return sp;
381 }
382 #else
383 // Returns the current stack pointer. Accurate value needed for
384 // os::verify_stack_alignment().
385 address os::current_stack_pointer() {
386 typedef address get_sp_func();
387 get_sp_func* func = CAST_TO_FN_PTR(get_sp_func*,
388 StubRoutines::x86::get_previous_sp_entry());
389 return (*func)();
390 }
391 #endif
392
393
394 #ifndef AMD64
395 intptr_t* _get_previous_fp() {
396 intptr_t **frameptr;
397 __asm {
398 mov frameptr, ebp
399 };
400 return *frameptr;
401 }
402 #endif // !AMD64
403
404 frame os::current_frame() {
405
406 #ifdef AMD64
407 // apparently _asm not supported on windows amd64
408 typedef intptr_t* get_fp_func ();
409 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
410 StubRoutines::x86::get_previous_fp_entry());
411 if (func == NULL) return frame(NULL, NULL, NULL);
412 intptr_t* fp = (*func)();
413 #else
414 intptr_t* fp = _get_previous_fp();
415 #endif // AMD64
416
417 frame myframe((intptr_t*)os::current_stack_pointer(),
418 (intptr_t*)fp,
419 CAST_FROM_FN_PTR(address, os::current_frame));
420 if (os::is_first_C_frame(&myframe)) {
421 // stack is not walkable
422 return frame(NULL, NULL, NULL);
423 } else {
424 return os::get_sender_for_C_frame(&myframe);
425 }
426 }
427
428 void os::print_context(outputStream *st, void *context) {
429 if (context == NULL) return;
430
431 CONTEXT* uc = (CONTEXT*)context;
432
433 st->print_cr("Registers:");
434 #ifdef AMD64
435 st->print( "RAX=" INTPTR_FORMAT, uc->Rax);
436 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx);
437 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx);
438 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx);
439 st->cr();
440 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp);
441 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp);
442 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi);
443 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi);
444 st->cr();
445 st->print( "R8 =" INTPTR_FORMAT, uc->R8);
446 st->print(", R9 =" INTPTR_FORMAT, uc->R9);
447 st->print(", R10=" INTPTR_FORMAT, uc->R10);
448 st->print(", R11=" INTPTR_FORMAT, uc->R11);
449 st->cr();
450 st->print( "R12=" INTPTR_FORMAT, uc->R12);
451 st->print(", R13=" INTPTR_FORMAT, uc->R13);
452 st->print(", R14=" INTPTR_FORMAT, uc->R14);
453 st->print(", R15=" INTPTR_FORMAT, uc->R15);
454 st->cr();
455 st->print( "RIP=" INTPTR_FORMAT, uc->Rip);
456 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
457 #else
458 st->print( "EAX=" INTPTR_FORMAT, uc->Eax);
459 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
460 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
461 st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
462 st->cr();
463 st->print( "ESP=" INTPTR_FORMAT, uc->Esp);
464 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
465 st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
466 st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
467 st->cr();
468 st->print( "EIP=" INTPTR_FORMAT, uc->Eip);
469 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
470 #endif // AMD64
471 st->cr();
472 st->cr();
473
474 intptr_t *sp = (intptr_t *)uc->REG_SP;
475 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
476 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
477 st->cr();
478
479 // Note: it may be unsafe to inspect memory near pc. For example, pc may
480 // point to garbage if entry point in an nmethod is corrupted. Leave
481 // this at the end, and hope for the best.
482 address pc = (address)uc->REG_PC;
483 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
484 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
485 st->cr();
486 }
487
488
489 void os::print_register_info(outputStream *st, void *context) {
490 if (context == NULL) return;
491
492 CONTEXT* uc = (CONTEXT*)context;
493
494 st->print_cr("Register to memory mapping:");
495 st->cr();
496
497 // this is only for the "general purpose" registers
498
499 #ifdef AMD64
500 st->print("RAX="); print_location(st, uc->Rax);
501 st->print("RBX="); print_location(st, uc->Rbx);
502 st->print("RCX="); print_location(st, uc->Rcx);
503 st->print("RDX="); print_location(st, uc->Rdx);
504 st->print("RSP="); print_location(st, uc->Rsp);
505 st->print("RBP="); print_location(st, uc->Rbp);
506 st->print("RSI="); print_location(st, uc->Rsi);
507 st->print("RDI="); print_location(st, uc->Rdi);
508 st->print("R8 ="); print_location(st, uc->R8);
509 st->print("R9 ="); print_location(st, uc->R9);
510 st->print("R10="); print_location(st, uc->R10);
511 st->print("R11="); print_location(st, uc->R11);
512 st->print("R12="); print_location(st, uc->R12);
513 st->print("R13="); print_location(st, uc->R13);
514 st->print("R14="); print_location(st, uc->R14);
515 st->print("R15="); print_location(st, uc->R15);
516 #else
517 st->print("EAX="); print_location(st, uc->Eax);
518 st->print("EBX="); print_location(st, uc->Ebx);
519 st->print("ECX="); print_location(st, uc->Ecx);
520 st->print("EDX="); print_location(st, uc->Edx);
521 st->print("ESP="); print_location(st, uc->Esp);
522 st->print("EBP="); print_location(st, uc->Ebp);
523 st->print("ESI="); print_location(st, uc->Esi);
524 st->print("EDI="); print_location(st, uc->Edi);
525 #endif
526
527 st->cr();
528 }
529
530 extern "C" int SafeFetch32 (int * adr, int Err) {
531 int rv = Err ;
532 _try {
533 rv = *((volatile int *) adr) ;
534 } __except(EXCEPTION_EXECUTE_HANDLER) {
535 }
536 return rv ;
537 }
538
539 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t Err) {
540 intptr_t rv = Err ;
541 _try {
542 rv = *((volatile intptr_t *) adr) ;
543 } __except(EXCEPTION_EXECUTE_HANDLER) {
544 }
545 return rv ;
546 }
547
548 extern "C" int SpinPause () {
549 #ifdef AMD64
550 return 0 ;
551 #else
552 // pause == rep:nop
553 // On systems that don't support pause a rep:nop
554 // is executed as a nop. The rep: prefix is ignored.
555 _asm {
556 pause ;
557 };
558 return 1 ;
559 #endif // AMD64
560 }
561
562
563 void os::setup_fpu() {
564 #ifndef AMD64
565 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
566 __asm fldcw fpu_cntrl_word;
567 #endif // !AMD64
568 }
569
570 #ifndef PRODUCT
571 void os::verify_stack_alignment() {
572 #ifdef AMD64
573 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
574 #endif
575 }
576 #endif