1 /*
2 * Copyright 1999-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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 // exception 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* b = BufferBlob::create("CodeCache Exception Handler", sizeof (DynamicCodeData));
153 CodeBuffer cb(b->instructions_begin(), b->instructions_size());
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 typedef void fence_func_t ();
200
201 #ifdef AMD64
202
203 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
204 // try to use the stub:
205 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
206
207 if (func != NULL) {
208 os::atomic_xchg_func = func;
209 return (*func)(exchange_value, dest);
210 }
211 assert(Threads::number_of_threads() == 0, "for bootstrap only");
212
213 jint old_value = *dest;
214 *dest = exchange_value;
215 return old_value;
216 }
217
218 intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) {
219 // try to use the stub:
220 xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry());
221
222 if (func != NULL) {
223 os::atomic_xchg_ptr_func = func;
224 return (*func)(exchange_value, dest);
225 }
226 assert(Threads::number_of_threads() == 0, "for bootstrap only");
227
228 intptr_t old_value = *dest;
229 *dest = exchange_value;
230 return old_value;
231 }
232
233
234 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
235 // try to use the stub:
236 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
237
238 if (func != NULL) {
239 os::atomic_cmpxchg_func = func;
240 return (*func)(exchange_value, dest, compare_value);
241 }
242 assert(Threads::number_of_threads() == 0, "for bootstrap only");
243
244 jint old_value = *dest;
245 if (old_value == compare_value)
246 *dest = exchange_value;
247 return old_value;
248 }
249 #endif // AMD64
250
251 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
252 // try to use the stub:
253 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
254
255 if (func != NULL) {
256 os::atomic_cmpxchg_long_func = func;
257 return (*func)(exchange_value, dest, compare_value);
258 }
259 assert(Threads::number_of_threads() == 0, "for bootstrap only");
260
261 jlong old_value = *dest;
262 if (old_value == compare_value)
263 *dest = exchange_value;
264 return old_value;
265 }
266
267 #ifdef AMD64
268
269 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
270 // try to use the stub:
271 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
272
273 if (func != NULL) {
274 os::atomic_add_func = func;
275 return (*func)(add_value, dest);
276 }
277 assert(Threads::number_of_threads() == 0, "for bootstrap only");
278
279 return (*dest) += add_value;
280 }
281
282 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) {
283 // try to use the stub:
284 add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry());
285
286 if (func != NULL) {
287 os::atomic_add_ptr_func = func;
288 return (*func)(add_value, dest);
289 }
290 assert(Threads::number_of_threads() == 0, "for bootstrap only");
291
292 return (*dest) += add_value;
293 }
294
295 void os::fence_bootstrap() {
296 // try to use the stub:
297 fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry());
298
299 if (func != NULL) {
300 os::fence_func = func;
301 (*func)();
302 return;
303 }
304 assert(Threads::number_of_threads() == 0, "for bootstrap only");
305
306 // don't have to do anything for a single thread
307 }
308
309
310 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
311 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap;
312 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
313 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
314 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap;
315 fence_func_t* os::fence_func = os::fence_bootstrap;
316
317 #endif // AMD64
318
319 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
320
321 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
322 intptr_t** ret_sp, intptr_t** ret_fp) {
323
324 ExtendedPC epc;
325 CONTEXT* uc = (CONTEXT*)ucVoid;
326
327 if (uc != NULL) {
328 epc = ExtendedPC((address)uc->REG_PC);
329 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
330 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
331 } else {
332 // construct empty ExtendedPC for return value checking
333 epc = ExtendedPC(NULL);
334 if (ret_sp) *ret_sp = (intptr_t *)NULL;
335 if (ret_fp) *ret_fp = (intptr_t *)NULL;
336 }
337
338 return epc;
339 }
340
341 frame os::fetch_frame_from_context(void* ucVoid) {
342 intptr_t* sp;
343 intptr_t* fp;
344 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
345 return frame(sp, fp, epc.pc());
346 }
347
348 // VC++ does not save frame pointer on stack in optimized build. It
349 // can be turned off by /Oy-. If we really want to walk C frames,
350 // we can use the StackWalk() API.
351 frame os::get_sender_for_C_frame(frame* fr) {
352 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
353 }
354
355
356 #ifndef AMD64
357 intptr_t* _get_previous_fp() {
358 intptr_t **frameptr;
359 __asm {
360 mov frameptr, ebp
361 };
362 return *frameptr;
363 }
364 #endif // !AMD64
365
366 frame os::current_frame() {
367
368 #ifdef AMD64
369 // apparently _asm not supported on windows amd64
370 typedef intptr_t* get_fp_func ();
371 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
372 StubRoutines::x86::get_previous_fp_entry());
373 if (func == NULL) return frame(NULL, NULL, NULL);
374 intptr_t* fp = (*func)();
375 #else
376 intptr_t* fp = _get_previous_fp();
377 #endif // AMD64
378
379 frame myframe((intptr_t*)os::current_stack_pointer(),
380 (intptr_t*)fp,
381 CAST_FROM_FN_PTR(address, os::current_frame));
382 if (os::is_first_C_frame(&myframe)) {
383 // stack is not walkable
384 return frame(NULL, NULL, NULL);
385 } else {
386 return os::get_sender_for_C_frame(&myframe);
387 }
388 }
389
390 void os::print_context(outputStream *st, void *context) {
391 if (context == NULL) return;
392
393 CONTEXT* uc = (CONTEXT*)context;
394
395 st->print_cr("Registers:");
396 #ifdef AMD64
397 st->print( "EAX=" INTPTR_FORMAT, uc->Rax);
398 st->print(", EBX=" INTPTR_FORMAT, uc->Rbx);
399 st->print(", ECX=" INTPTR_FORMAT, uc->Rcx);
400 st->print(", EDX=" INTPTR_FORMAT, uc->Rdx);
401 st->cr();
402 st->print( "ESP=" INTPTR_FORMAT, uc->Rsp);
403 st->print(", EBP=" INTPTR_FORMAT, uc->Rbp);
404 st->print(", ESI=" INTPTR_FORMAT, uc->Rsi);
405 st->print(", EDI=" INTPTR_FORMAT, uc->Rdi);
406 st->cr();
407 st->print( "EIP=" INTPTR_FORMAT, uc->Rip);
408 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
409 #else
410 st->print( "EAX=" INTPTR_FORMAT, uc->Eax);
411 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
412 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
413 st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
414 st->cr();
415 st->print( "ESP=" INTPTR_FORMAT, uc->Esp);
416 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
417 st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
418 st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
419 st->cr();
420 st->print( "EIP=" INTPTR_FORMAT, uc->Eip);
421 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
422 #endif // AMD64
423 st->cr();
424 st->cr();
425
426 intptr_t *sp = (intptr_t *)uc->REG_SP;
427 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
428 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
429 st->cr();
430
431 // Note: it may be unsafe to inspect memory near pc. For example, pc may
432 // point to garbage if entry point in an nmethod is corrupted. Leave
433 // this at the end, and hope for the best.
434 address pc = (address)uc->REG_PC;
435 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
436 print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
437 st->cr();
438 }
439
440 extern "C" int SafeFetch32 (int * adr, int Err) {
441 int rv = Err ;
442 _try {
443 rv = *((volatile int *) adr) ;
444 } __except(EXCEPTION_EXECUTE_HANDLER) {
445 }
446 return rv ;
447 }
448
449 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t Err) {
450 intptr_t rv = Err ;
451 _try {
452 rv = *((volatile intptr_t *) adr) ;
453 } __except(EXCEPTION_EXECUTE_HANDLER) {
454 }
455 return rv ;
456 }
457
458 extern "C" int SpinPause () {
459 #ifdef AMD64
460 return 0 ;
461 #else
462 // pause == rep:nop
463 // On systems that don't support pause a rep:nop
464 // is executed as a nop. The rep: prefix is ignored.
465 _asm {
466 pause ;
467 };
468 return 1 ;
469 #endif // AMD64
470 }
471
472
473 void os::setup_fpu() {
474 #ifndef AMD64
475 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
476 __asm fldcw fpu_cntrl_word;
477 #endif // !AMD64
478 }