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 // do not include precompiled header file
26 # include "incls/_os_windows_x86.cpp.incl"
27 # include "unwind_windows_x86.hpp"
28 #undef REG_SP
29 #undef REG_FP
30 #undef REG_PC
31 #ifdef AMD64
32 #define REG_SP Rsp
33 #define REG_FP Rbp
34 #define REG_PC Rip
35 #else
36 #define REG_SP Esp
37 #define REG_FP Ebp
38 #define REG_PC Eip
39 #endif // AMD64
40
41 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* );
42
43 // Install a win32 structured exception handler around thread.
44 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
45 __try {
46
47 #ifndef AMD64
48 // We store the current thread in this wrapperthread location
49 // and determine how far away this address is from the structured
50 // execption pointer that FS:[0] points to. This get_thread
51 // code can then get the thread pointer via FS.
52 //
53 // Warning: This routine must NEVER be inlined since we'd end up with
54 // multiple offsets.
55 //
56 volatile Thread* wrapperthread = thread;
57
58 if ( ThreadLocalStorage::get_thread_ptr_offset() == 0 ) {
59 int thread_ptr_offset;
60 __asm {
61 lea eax, dword ptr wrapperthread;
62 sub eax, dword ptr FS:[0H];
63 mov thread_ptr_offset, eax
64 };
65 ThreadLocalStorage::set_thread_ptr_offset(thread_ptr_offset);
66 }
67 #ifdef ASSERT
68 // Verify that the offset hasn't changed since we initally captured
69 // it. This might happen if we accidentally ended up with an
70 // inlined version of this routine.
71 else {
72 int test_thread_ptr_offset;
73 __asm {
74 lea eax, dword ptr wrapperthread;
75 sub eax, dword ptr FS:[0H];
76 mov test_thread_ptr_offset, eax
77 };
78 assert(test_thread_ptr_offset == ThreadLocalStorage::get_thread_ptr_offset(),
79 "thread pointer offset from SEH changed");
80 }
81 #endif // ASSERT
82 #endif // !AMD64
83
84 f(value, method, args, thread);
85 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) {
86 // Nothing to do.
87 }
88 }
89
90 #ifdef AMD64
91
92 // This is the language specific handler for exceptions
93 // originating from dynamically generated code.
94 // We call the standard structured exception handler
95 // We only expect Continued Execution since we cannot unwind
96 // from generated code.
97 LONG HandleExceptionFromCodeCache(
98 IN PEXCEPTION_RECORD ExceptionRecord,
99 IN ULONG64 EstablisherFrame,
100 IN OUT PCONTEXT ContextRecord,
101 IN OUT PDISPATCHER_CONTEXT DispatcherContext) {
102 EXCEPTION_POINTERS ep;
103 LONG result;
104
105 ep.ExceptionRecord = ExceptionRecord;
106 ep.ContextRecord = ContextRecord;
107
108 result = topLevelExceptionFilter(&ep);
109
110 // We better only get a CONTINUE_EXECUTION from our handler
111 // since we don't have unwind information registered.
112
113 guarantee( result == EXCEPTION_CONTINUE_EXECUTION,
114 "Unexpected result from topLevelExceptionFilter");
115
116 return(ExceptionContinueExecution);
117 }
118
119
120 // Structure containing the Windows Data Structures required
121 // to register our Code Cache exception handler.
122 // We put these in the CodeCache since the API requires
123 // all addresses in these structures are relative to the Code
124 // area registered with RtlAddFunctionTable.
125 typedef struct {
126 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache
127 RUNTIME_FUNCTION rt;
128 UNWIND_INFO_EH_ONLY unw;
129 } DynamicCodeData, *pDynamicCodeData;
130
131 #endif // AMD64
132 //
133 // Register our CodeCache area with the OS so it will dispatch exceptions
134 // to our topLevelExceptionFilter when we take an exception in our
135 // dynamically generated code.
136 //
137 // Arguments: low and high are the address of the full reserved
138 // codeCache area
139 //
140 bool os::register_code_area(char *low, char *high) {
141 #ifdef AMD64
142
143 ResourceMark rm;
144
145 pDynamicCodeData pDCD;
146 PRUNTIME_FUNCTION prt;
147 PUNWIND_INFO_EH_ONLY punwind;
148
149 // If we are using Vectored Exceptions we don't need this registration
150 if (UseVectoredExceptions) return true;
151
152 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData));
153 CodeBuffer cb(blob);
154 MacroAssembler* masm = new MacroAssembler(&cb);
155 pDCD = (pDynamicCodeData) masm->pc();
156
157 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache));
158 masm->flush();
159
160 // Create an Unwind Structure specifying no unwind info
161 // other than an Exception Handler
162 punwind = &pDCD->unw;
163 punwind->Version = 1;
164 punwind->Flags = UNW_FLAG_EHANDLER;
165 punwind->SizeOfProlog = 0;
166 punwind->CountOfCodes = 0;
167 punwind->FrameRegister = 0;
168 punwind->FrameOffset = 0;
169 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) -
170 (char*)low;
171 punwind->ExceptionData[0] = 0;
172
173 // This structure describes the covered dynamic code area.
174 // Addresses are relative to the beginning on the code cache area
175 prt = &pDCD->rt;
176 prt->BeginAddress = 0;
177 prt->EndAddress = (ULONG)(high - low);
178 prt->UnwindData = ((char *)punwind - low);
179
180 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low),
181 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable");
182
183 #endif // AMD64
184 return true;
185 }
186
187 void os::initialize_thread() {
188 // Nothing to do.
189 }
190
191 // Atomics and Stub Functions
192
193 typedef jint xchg_func_t (jint, volatile jint*);
194 typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*);
195 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
196 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong);
197 typedef jint add_func_t (jint, volatile jint*);
198 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*);
199
200 #ifdef AMD64
201
202 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
203 // try to use the stub:
204 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
205
206 if (func != NULL) {
207 os::atomic_xchg_func = func;
208 return (*func)(exchange_value, dest);
209 }
210 assert(Threads::number_of_threads() == 0, "for bootstrap only");
211
212 jint old_value = *dest;
213 *dest = exchange_value;
214 return old_value;
215 }
216
217 intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) {
218 // try to use the stub:
219 xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry());
220
221 if (func != NULL) {
222 os::atomic_xchg_ptr_func = func;
223 return (*func)(exchange_value, dest);
224 }
225 assert(Threads::number_of_threads() == 0, "for bootstrap only");
226
227 intptr_t old_value = *dest;
228 *dest = exchange_value;
229 return old_value;
230 }
231
232
233 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
234 // try to use the stub:
235 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
236
237 if (func != NULL) {
238 os::atomic_cmpxchg_func = func;
239 return (*func)(exchange_value, dest, compare_value);
240 }
241 assert(Threads::number_of_threads() == 0, "for bootstrap only");
242
243 jint old_value = *dest;
244 if (old_value == compare_value)
245 *dest = exchange_value;
246 return old_value;
247 }
248 #endif // AMD64
249
250 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
251 // try to use the stub:
252 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
253
254 if (func != NULL) {
255 os::atomic_cmpxchg_long_func = func;
256 return (*func)(exchange_value, dest, compare_value);
257 }
258 assert(Threads::number_of_threads() == 0, "for bootstrap only");
259
260 jlong old_value = *dest;
261 if (old_value == compare_value)
262 *dest = exchange_value;
263 return old_value;
264 }
265
266 #ifdef AMD64
267
268 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
269 // try to use the stub:
270 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
271
272 if (func != NULL) {
273 os::atomic_add_func = func;
274 return (*func)(add_value, dest);
275 }
276 assert(Threads::number_of_threads() == 0, "for bootstrap only");
277
278 return (*dest) += add_value;
279 }
280
281 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) {
282 // try to use the stub:
283 add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry());
284
285 if (func != NULL) {
286 os::atomic_add_ptr_func = func;
287 return (*func)(add_value, dest);
288 }
289 assert(Threads::number_of_threads() == 0, "for bootstrap only");
290
291 return (*dest) += add_value;
292 }
293
294 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
295 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap;
296 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
297 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
298 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap;
299
300 #endif // AMD64
301
302 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
303
304 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
305 intptr_t** ret_sp, intptr_t** ret_fp) {
306
307 ExtendedPC epc;
308 CONTEXT* uc = (CONTEXT*)ucVoid;
309
310 if (uc != NULL) {
311 epc = ExtendedPC((address)uc->REG_PC);
312 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
313 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
314 } else {
315 // construct empty ExtendedPC for return value checking
316 epc = ExtendedPC(NULL);
317 if (ret_sp) *ret_sp = (intptr_t *)NULL;
318 if (ret_fp) *ret_fp = (intptr_t *)NULL;
319 }
320
321 return epc;
322 }
323
324 frame os::fetch_frame_from_context(void* ucVoid) {
325 intptr_t* sp;
326 intptr_t* fp;
327 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
328 return frame(sp, fp, epc.pc());
329 }
330
331 // VC++ does not save frame pointer on stack in optimized build. It
332 // can be turned off by /Oy-. If we really want to walk C frames,
333 // we can use the StackWalk() API.
334 frame os::get_sender_for_C_frame(frame* fr) {
335 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
336 }
337
338
339 #ifndef AMD64
340 intptr_t* _get_previous_fp() {
341 intptr_t **frameptr;
342 __asm {
343 mov frameptr, ebp
344 };
345 return *frameptr;
346 }
347 #endif // !AMD64
348
349 frame os::current_frame() {
350
351 #ifdef AMD64
352 // apparently _asm not supported on windows amd64
353 typedef intptr_t* get_fp_func ();
354 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
355 StubRoutines::x86::get_previous_fp_entry());
356 if (func == NULL) return frame(NULL, NULL, NULL);
357 intptr_t* fp = (*func)();
358 #else
359 intptr_t* fp = _get_previous_fp();
360 #endif // AMD64
361
362 frame myframe((intptr_t*)os::current_stack_pointer(),
363 (intptr_t*)fp,
364 CAST_FROM_FN_PTR(address, os::current_frame));
365 if (os::is_first_C_frame(&myframe)) {
366 // stack is not walkable
367 return frame(NULL, NULL, NULL);
368 } else {
369 return os::get_sender_for_C_frame(&myframe);
370 }
371 }
372
373 void os::print_context(outputStream *st, void *context) {
374 if (context == NULL) return;
375
376 CONTEXT* uc = (CONTEXT*)context;
377
378 st->print_cr("Registers:");
379 #ifdef AMD64
380 st->print( "RAX=" INTPTR_FORMAT, uc->Rax);
381 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx);
382 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx);
383 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx);
384 st->cr();
385 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp);
386 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp);
387 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi);
388 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi);
389 st->cr();
390 st->print( "R8 =" INTPTR_FORMAT, uc->R8);
391 st->print(", R9 =" INTPTR_FORMAT, uc->R9);
392 st->print(", R10=" INTPTR_FORMAT, uc->R10);
393 st->print(", R11=" INTPTR_FORMAT, uc->R11);
394 st->cr();
395 st->print( "R12=" INTPTR_FORMAT, uc->R12);
396 st->print(", R13=" INTPTR_FORMAT, uc->R13);
397 st->print(", R14=" INTPTR_FORMAT, uc->R14);
398 st->print(", R15=" INTPTR_FORMAT, uc->R15);
399 st->cr();
400 st->print( "RIP=" INTPTR_FORMAT, uc->Rip);
401 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
402 #else
403 st->print( "EAX=" INTPTR_FORMAT, uc->Eax);
404 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
405 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
406 st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
407 st->cr();
408 st->print( "ESP=" INTPTR_FORMAT, uc->Esp);
409 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
410 st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
411 st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
412 st->cr();
413 st->print( "EIP=" INTPTR_FORMAT, uc->Eip);
414 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
415 #endif // AMD64
416 st->cr();
417 st->cr();
418
419 intptr_t *sp = (intptr_t *)uc->REG_SP;
420 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
421 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
422 st->cr();
423
424 // Note: it may be unsafe to inspect memory near pc. For example, pc may
425 // point to garbage if entry point in an nmethod is corrupted. Leave
426 // this at the end, and hope for the best.
427 address pc = (address)uc->REG_PC;
428 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
429 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
430 st->cr();
431 }
432
433
434 void os::print_register_info(outputStream *st, void *context) {
435 if (context == NULL) return;
436
437 CONTEXT* uc = (CONTEXT*)context;
438
439 st->print_cr("Register to memory mapping:");
440 st->cr();
441
442 // this is only for the "general purpose" registers
443
444 #ifdef AMD64
445 st->print("RAX="); print_location(st, uc->Rax);
446 st->print("RBX="); print_location(st, uc->Rbx);
447 st->print("RCX="); print_location(st, uc->Rcx);
448 st->print("RDX="); print_location(st, uc->Rdx);
449 st->print("RSP="); print_location(st, uc->Rsp);
450 st->print("RBP="); print_location(st, uc->Rbp);
451 st->print("RSI="); print_location(st, uc->Rsi);
452 st->print("RDI="); print_location(st, uc->Rdi);
453 st->print("R8 ="); print_location(st, uc->R8);
454 st->print("R9 ="); print_location(st, uc->R9);
455 st->print("R10="); print_location(st, uc->R10);
456 st->print("R11="); print_location(st, uc->R11);
457 st->print("R12="); print_location(st, uc->R12);
458 st->print("R13="); print_location(st, uc->R13);
459 st->print("R14="); print_location(st, uc->R14);
460 st->print("R15="); print_location(st, uc->R15);
461 #else
462 st->print("EAX="); print_location(st, uc->Eax);
463 st->print("EBX="); print_location(st, uc->Ebx);
464 st->print("ECX="); print_location(st, uc->Ecx);
465 st->print("EDX="); print_location(st, uc->Edx);
466 st->print("ESP="); print_location(st, uc->Esp);
467 st->print("EBP="); print_location(st, uc->Ebp);
468 st->print("ESI="); print_location(st, uc->Esi);
469 st->print("EDI="); print_location(st, uc->Edi);
470 #endif
471
472 st->cr();
473 }
474
475 extern "C" int SafeFetch32 (int * adr, int Err) {
476 int rv = Err ;
477 _try {
478 rv = *((volatile int *) adr) ;
479 } __except(EXCEPTION_EXECUTE_HANDLER) {
480 }
481 return rv ;
482 }
483
484 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t Err) {
485 intptr_t rv = Err ;
486 _try {
487 rv = *((volatile intptr_t *) adr) ;
488 } __except(EXCEPTION_EXECUTE_HANDLER) {
489 }
490 return rv ;
491 }
492
493 extern "C" int SpinPause () {
494 #ifdef AMD64
495 return 0 ;
496 #else
497 // pause == rep:nop
498 // On systems that don't support pause a rep:nop
499 // is executed as a nop. The rep: prefix is ignored.
500 _asm {
501 pause ;
502 };
503 return 1 ;
504 #endif // AMD64
505 }
506
507
508 void os::setup_fpu() {
509 #ifndef AMD64
510 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
511 __asm fldcw fpu_cntrl_word;
512 #endif // !AMD64
513 }