1 /*
2 * Copyright (c) 1999, 2020, 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/frame.inline.hpp"
42 #include "runtime/interfaceSupport.inline.hpp"
43 #include "runtime/java.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/mutexLocker.hpp"
46 #include "runtime/osThread.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/stubRoutines.hpp"
49 #include "runtime/thread.inline.hpp"
50 #include "runtime/timer.hpp"
51 #include "symbolengine.hpp"
52 #include "unwind_windows_x86.hpp"
53 #include "utilities/events.hpp"
54 #include "utilities/vmError.hpp"
55 #include "windbghelp.hpp"
56
57
58 #undef REG_SP
59 #undef REG_FP
60 #undef REG_PC
61 #ifdef AMD64
62 #define REG_SP Rsp
63 #define REG_FP Rbp
64 #define REG_PC Rip
65 #else
66 #define REG_SP Esp
67 #define REG_FP Ebp
68 #define REG_PC Eip
69 #endif // AMD64
70
71 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* );
72
73 // Install a win32 structured exception handler around thread.
74 void os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread) {
75 __try {
76
77 #ifndef AMD64
78 // We store the current thread in this wrapperthread location
79 // and determine how far away this address is from the structured
80 // execption pointer that FS:[0] points to. This get_thread
81 // code can then get the thread pointer via FS.
82 //
83 // Warning: This routine must NEVER be inlined since we'd end up with
84 // multiple offsets.
85 //
86 volatile Thread* wrapperthread = thread;
87
88 if (os::win32::get_thread_ptr_offset() == 0) {
89 int thread_ptr_offset;
90 __asm {
91 lea eax, dword ptr wrapperthread;
92 sub eax, dword ptr FS:[0H];
93 mov thread_ptr_offset, eax
94 };
95 os::win32::set_thread_ptr_offset(thread_ptr_offset);
96 }
97 #ifdef ASSERT
98 // Verify that the offset hasn't changed since we initally captured
99 // it. This might happen if we accidentally ended up with an
100 // inlined version of this routine.
101 else {
102 int test_thread_ptr_offset;
103 __asm {
104 lea eax, dword ptr wrapperthread;
105 sub eax, dword ptr FS:[0H];
106 mov test_thread_ptr_offset, eax
107 };
108 assert(test_thread_ptr_offset == os::win32::get_thread_ptr_offset(),
109 "thread pointer offset from SEH changed");
110 }
111 #endif // ASSERT
112 #endif // !AMD64
113
114 f(value, method, args, thread);
115 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) {
116 // Nothing to do.
117 }
118 }
119
120 #ifdef AMD64
121
122 // This is the language specific handler for exceptions
123 // originating from dynamically generated code.
124 // We call the standard structured exception handler
125 // We only expect Continued Execution since we cannot unwind
126 // from generated code.
127 LONG HandleExceptionFromCodeCache(
128 IN PEXCEPTION_RECORD ExceptionRecord,
129 IN ULONG64 EstablisherFrame,
130 IN OUT PCONTEXT ContextRecord,
131 IN OUT PDISPATCHER_CONTEXT DispatcherContext) {
132 EXCEPTION_POINTERS ep;
133 LONG result;
134
135 ep.ExceptionRecord = ExceptionRecord;
136 ep.ContextRecord = ContextRecord;
137
138 result = topLevelExceptionFilter(&ep);
139
140 // We better only get a CONTINUE_EXECUTION from our handler
141 // since we don't have unwind information registered.
142
143 guarantee( result == EXCEPTION_CONTINUE_EXECUTION,
144 "Unexpected result from topLevelExceptionFilter");
145
146 return(ExceptionContinueExecution);
147 }
148
149
150 // Structure containing the Windows Data Structures required
151 // to register our Code Cache exception handler.
152 // We put these in the CodeCache since the API requires
153 // all addresses in these structures are relative to the Code
154 // area registered with RtlAddFunctionTable.
155 typedef struct {
156 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache
157 RUNTIME_FUNCTION rt;
158 UNWIND_INFO_EH_ONLY unw;
159 } DynamicCodeData, *pDynamicCodeData;
160
161 #endif // AMD64
162 //
163 // Register our CodeCache area with the OS so it will dispatch exceptions
164 // to our topLevelExceptionFilter when we take an exception in our
165 // dynamically generated code.
166 //
167 // Arguments: low and high are the address of the full reserved
168 // codeCache area
169 //
170 bool os::register_code_area(char *low, char *high) {
171 #ifdef AMD64
172
173 ResourceMark rm;
174
175 pDynamicCodeData pDCD;
176 PRUNTIME_FUNCTION prt;
177 PUNWIND_INFO_EH_ONLY punwind;
178
179 BufferBlob* blob = BufferBlob::create("CodeCache Exception Handler", sizeof(DynamicCodeData));
180 CodeBuffer cb(blob);
181 MacroAssembler* masm = new MacroAssembler(&cb);
182 pDCD = (pDynamicCodeData) masm->pc();
183
184 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache));
185 masm->flush();
186
187 // Create an Unwind Structure specifying no unwind info
188 // other than an Exception Handler
189 punwind = &pDCD->unw;
190 punwind->Version = 1;
191 punwind->Flags = UNW_FLAG_EHANDLER;
192 punwind->SizeOfProlog = 0;
193 punwind->CountOfCodes = 0;
194 punwind->FrameRegister = 0;
195 punwind->FrameOffset = 0;
196 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) -
197 (char*)low;
198 punwind->ExceptionData[0] = 0;
199
200 // This structure describes the covered dynamic code area.
201 // Addresses are relative to the beginning on the code cache area
202 prt = &pDCD->rt;
203 prt->BeginAddress = 0;
204 prt->EndAddress = (ULONG)(high - low);
205 prt->UnwindData = ((char *)punwind - low);
206
207 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low),
208 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable");
209
210 #endif // AMD64
211 return true;
212 }
213
214 #ifdef AMD64
215 /*
216 * Windows/x64 does not use stack frames the way expected by Java:
217 * [1] in most cases, there is no frame pointer. All locals are addressed via RSP
218 * [2] in rare cases, when alloca() is used, a frame pointer is used, but this may
219 * not be RBP.
220 * See http://msdn.microsoft.com/en-us/library/ew5tede7.aspx
221 *
222 * So it's not possible to print the native stack using the
223 * while (...) {... fr = os::get_sender_for_C_frame(&fr); }
224 * loop in vmError.cpp. We need to roll our own loop.
225 */
226 bool os::platform_print_native_stack(outputStream* st, const void* context,
227 char *buf, int buf_size)
228 {
229 CONTEXT ctx;
230 if (context != NULL) {
231 memcpy(&ctx, context, sizeof(ctx));
232 } else {
233 RtlCaptureContext(&ctx);
234 }
235
236 st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)");
237
238 STACKFRAME stk;
239 memset(&stk, 0, sizeof(stk));
240 stk.AddrStack.Offset = ctx.Rsp;
241 stk.AddrStack.Mode = AddrModeFlat;
242 stk.AddrFrame.Offset = ctx.Rbp;
243 stk.AddrFrame.Mode = AddrModeFlat;
244 stk.AddrPC.Offset = ctx.Rip;
245 stk.AddrPC.Mode = AddrModeFlat;
246
247 int count = 0;
248 address lastpc = 0;
249 while (count++ < StackPrintLimit) {
250 intptr_t* sp = (intptr_t*)stk.AddrStack.Offset;
251 intptr_t* fp = (intptr_t*)stk.AddrFrame.Offset; // NOT necessarily the same as ctx.Rbp!
252 address pc = (address)stk.AddrPC.Offset;
253
254 if (pc != NULL) {
255 if (count == 2 && lastpc == pc) {
256 // Skip it -- StackWalk64() may return the same PC
257 // (but different SP) on the first try.
258 } else {
259 // Don't try to create a frame(sp, fp, pc) -- on WinX64, stk.AddrFrame
260 // may not contain what Java expects, and may cause the frame() constructor
261 // to crash. Let's just print out the symbolic address.
262 frame::print_C_frame(st, buf, buf_size, pc);
263 // print source file and line, if available
264 char buf[128];
265 int line_no;
266 if (SymbolEngine::get_source_info(pc, buf, sizeof(buf), &line_no)) {
267 st->print(" (%s:%d)", buf, line_no);
268 }
269 st->cr();
270 }
271 lastpc = pc;
272 }
273
274 PVOID p = WindowsDbgHelp::symFunctionTableAccess64(GetCurrentProcess(), stk.AddrPC.Offset);
275 if (!p) {
276 // StackWalk64() can't handle this PC. Calling StackWalk64 again may cause crash.
277 break;
278 }
279
280 BOOL result = WindowsDbgHelp::stackWalk64(
281 IMAGE_FILE_MACHINE_AMD64, // __in DWORD MachineType,
282 GetCurrentProcess(), // __in HANDLE hProcess,
283 GetCurrentThread(), // __in HANDLE hThread,
284 &stk, // __inout LP STACKFRAME64 StackFrame,
285 &ctx); // __inout PVOID ContextRecord,
286
287 if (!result) {
288 break;
289 }
290 }
291 if (count > StackPrintLimit) {
292 st->print_cr("...<more frames>...");
293 }
294 st->cr();
295
296 return true;
297 }
298 #endif // AMD64
299
300 address os::fetch_frame_from_context(const void* ucVoid,
301 intptr_t** ret_sp, intptr_t** ret_fp) {
302
303 address epc;
304 CONTEXT* uc = (CONTEXT*)ucVoid;
305
306 if (uc != NULL) {
307 epc = (address)uc->REG_PC;
308 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
309 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
310 } else {
311 epc = NULL;
312 if (ret_sp) *ret_sp = (intptr_t *)NULL;
313 if (ret_fp) *ret_fp = (intptr_t *)NULL;
314 }
315
316 return epc;
317 }
318
319 frame os::fetch_frame_from_context(const void* ucVoid) {
320 intptr_t* sp;
321 intptr_t* fp;
322 address epc = fetch_frame_from_context(ucVoid, &sp, &fp);
323 return frame(sp, fp, epc);
324 }
325
326 // VC++ does not save frame pointer on stack in optimized build. It
327 // can be turned off by /Oy-. If we really want to walk C frames,
328 // we can use the StackWalk() API.
329 frame os::get_sender_for_C_frame(frame* fr) {
330 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
331 }
332
333 #ifndef AMD64
334 // Ignore "C4172: returning address of local variable or temporary" on 32bit
335 PRAGMA_DIAG_PUSH
336 PRAGMA_DISABLE_MSVC_WARNING(4172)
337 // Returns an estimate of the current stack pointer. Result must be guaranteed
338 // to point into the calling threads stack, and be no lower than the current
339 // stack pointer.
340 address os::current_stack_pointer() {
341 int dummy;
342 address sp = (address)&dummy;
343 return sp;
344 }
345 PRAGMA_DIAG_POP
346 #else
347 // Returns the current stack pointer. Accurate value needed for
348 // os::verify_stack_alignment().
349 address os::current_stack_pointer() {
350 typedef address get_sp_func();
351 get_sp_func* func = CAST_TO_FN_PTR(get_sp_func*,
352 StubRoutines::x86::get_previous_sp_entry());
353 return (*func)();
354 }
355 #endif
356
357
358 #ifndef AMD64
359 intptr_t* _get_previous_fp() {
360 intptr_t **frameptr;
361 __asm {
362 mov frameptr, ebp
363 };
364 // ebp (frameptr) is for this frame (_get_previous_fp). We want the ebp for the
365 // caller of os::current_frame*(), so go up two frames. However, for
366 // optimized builds, _get_previous_fp() will be inlined, so only go
367 // up 1 frame in that case.
368 #ifdef _NMT_NOINLINE_
369 return **(intptr_t***)frameptr;
370 #else
371 return *frameptr;
372 #endif
373 }
374 #endif // !AMD64
375
376 frame os::current_frame() {
377
378 #ifdef AMD64
379 // apparently _asm not supported on windows amd64
380 typedef intptr_t* get_fp_func ();
381 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
382 StubRoutines::x86::get_previous_fp_entry());
383 if (func == NULL) return frame();
384 intptr_t* fp = (*func)();
385 if (fp == NULL) {
386 return frame();
387 }
388 #else
389 intptr_t* fp = _get_previous_fp();
390 #endif // AMD64
391
392 frame myframe((intptr_t*)os::current_stack_pointer(),
393 (intptr_t*)fp,
394 CAST_FROM_FN_PTR(address, os::current_frame));
395 if (os::is_first_C_frame(&myframe)) {
396 // stack is not walkable
397 return frame();
398 } else {
399 return os::get_sender_for_C_frame(&myframe);
400 }
401 }
402
403 void os::print_context(outputStream *st, const void *context) {
404 if (context == NULL) return;
405
406 const CONTEXT* uc = (const CONTEXT*)context;
407
408 st->print_cr("Registers:");
409 #ifdef AMD64
410 st->print( "RAX=" INTPTR_FORMAT, uc->Rax);
411 st->print(", RBX=" INTPTR_FORMAT, uc->Rbx);
412 st->print(", RCX=" INTPTR_FORMAT, uc->Rcx);
413 st->print(", RDX=" INTPTR_FORMAT, uc->Rdx);
414 st->cr();
415 st->print( "RSP=" INTPTR_FORMAT, uc->Rsp);
416 st->print(", RBP=" INTPTR_FORMAT, uc->Rbp);
417 st->print(", RSI=" INTPTR_FORMAT, uc->Rsi);
418 st->print(", RDI=" INTPTR_FORMAT, uc->Rdi);
419 st->cr();
420 st->print( "R8 =" INTPTR_FORMAT, uc->R8);
421 st->print(", R9 =" INTPTR_FORMAT, uc->R9);
422 st->print(", R10=" INTPTR_FORMAT, uc->R10);
423 st->print(", R11=" INTPTR_FORMAT, uc->R11);
424 st->cr();
425 st->print( "R12=" INTPTR_FORMAT, uc->R12);
426 st->print(", R13=" INTPTR_FORMAT, uc->R13);
427 st->print(", R14=" INTPTR_FORMAT, uc->R14);
428 st->print(", R15=" INTPTR_FORMAT, uc->R15);
429 st->cr();
430 st->print( "RIP=" INTPTR_FORMAT, uc->Rip);
431 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
432 #else
433 st->print( "EAX=" INTPTR_FORMAT, uc->Eax);
434 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
435 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
436 st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
437 st->cr();
438 st->print( "ESP=" INTPTR_FORMAT, uc->Esp);
439 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
440 st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
441 st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
442 st->cr();
443 st->print( "EIP=" INTPTR_FORMAT, uc->Eip);
444 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
445 #endif // AMD64
446 st->cr();
447 st->cr();
448
449 intptr_t *sp = (intptr_t *)uc->REG_SP;
450 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
451 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
452 st->cr();
453
454 // Note: it may be unsafe to inspect memory near pc. For example, pc may
455 // point to garbage if entry point in an nmethod is corrupted. Leave
456 // this at the end, and hope for the best.
457 address pc = (address)uc->REG_PC;
458 print_instructions(st, pc, sizeof(char));
459 st->cr();
460 }
461
462
463 void os::print_register_info(outputStream *st, const void *context) {
464 if (context == NULL) return;
465
466 const CONTEXT* uc = (const CONTEXT*)context;
467
468 st->print_cr("Register to memory mapping:");
469 st->cr();
470
471 // this is only for the "general purpose" registers
472
473 #ifdef AMD64
474 st->print("RIP="); print_location(st, uc->Rip);
475 st->print("RAX="); print_location(st, uc->Rax);
476 st->print("RBX="); print_location(st, uc->Rbx);
477 st->print("RCX="); print_location(st, uc->Rcx);
478 st->print("RDX="); print_location(st, uc->Rdx);
479 st->print("RSP="); print_location(st, uc->Rsp);
480 st->print("RBP="); print_location(st, uc->Rbp);
481 st->print("RSI="); print_location(st, uc->Rsi);
482 st->print("RDI="); print_location(st, uc->Rdi);
483 st->print("R8 ="); print_location(st, uc->R8);
484 st->print("R9 ="); print_location(st, uc->R9);
485 st->print("R10="); print_location(st, uc->R10);
486 st->print("R11="); print_location(st, uc->R11);
487 st->print("R12="); print_location(st, uc->R12);
488 st->print("R13="); print_location(st, uc->R13);
489 st->print("R14="); print_location(st, uc->R14);
490 st->print("R15="); print_location(st, uc->R15);
491 #else
492 st->print("EIP="); print_location(st, uc->Eip);
493 st->print("EAX="); print_location(st, uc->Eax);
494 st->print("EBX="); print_location(st, uc->Ebx);
495 st->print("ECX="); print_location(st, uc->Ecx);
496 st->print("EDX="); print_location(st, uc->Edx);
497 st->print("ESP="); print_location(st, uc->Esp);
498 st->print("EBP="); print_location(st, uc->Ebp);
499 st->print("ESI="); print_location(st, uc->Esi);
500 st->print("EDI="); print_location(st, uc->Edi);
501 #endif
502
503 st->cr();
504 }
505
506 extern "C" int SpinPause () {
507 #ifdef AMD64
508 return 0 ;
509 #else
510 // pause == rep:nop
511 // On systems that don't support pause a rep:nop
512 // is executed as a nop. The rep: prefix is ignored.
513 _asm {
514 pause ;
515 };
516 return 1 ;
517 #endif // AMD64
518 }
519
520
521 void os::setup_fpu() {
522 #ifndef AMD64
523 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
524 __asm fldcw fpu_cntrl_word;
525 #endif // !AMD64
526 }
527
528 #ifndef PRODUCT
529 void os::verify_stack_alignment() {
530 #ifdef AMD64
531 // The current_stack_pointer() calls generated get_previous_sp stub routine.
532 // Only enable the assert after the routine becomes available.
533 if (StubRoutines::code1() != NULL) {
534 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
535 }
536 #endif
537 }
538 #endif
539
540 int os::extra_bang_size_in_bytes() {
541 // JDK-8050147 requires the full cache line bang for x86.
542 return VM_Version::L1_line_size();
543 }