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