1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // no precompiled headers
27 #include "jvm.h"
28 #include "asm/macroAssembler.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "code/nativeInst.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "os_share_linux.hpp"
39 #include "prims/jniFastGetField.hpp"
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.inline.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/thread.inline.hpp"
52 #include "runtime/timer.hpp"
53 #include "utilities/debug.hpp"
54 #include "utilities/events.hpp"
55 #include "utilities/vmError.hpp"
56 #ifdef BUILTIN_SIM
57 #include "../../../../../../simulator/simulator.hpp"
58 #endif
59
60 // put OS-includes here
61 # include <sys/types.h>
62 # include <sys/mman.h>
63 # include <pthread.h>
64 # include <signal.h>
65 # include <errno.h>
66 # include <dlfcn.h>
67 # include <stdlib.h>
68 # include <stdio.h>
69 # include <unistd.h>
70 # include <sys/resource.h>
71 # include <pthread.h>
72 # include <sys/stat.h>
73 # include <sys/time.h>
74 # include <sys/utsname.h>
75 # include <sys/socket.h>
76 # include <sys/wait.h>
77 # include <pwd.h>
78 # include <poll.h>
79 # include <ucontext.h>
80 # include <fpu_control.h>
81
82 #ifdef BUILTIN_SIM
83 #define REG_SP REG_RSP
84 #define REG_PC REG_RIP
85 #define REG_FP REG_RBP
86 #define SPELL_REG_SP "rsp"
87 #define SPELL_REG_FP "rbp"
88 #else
89 #define REG_FP 29
90 #define REG_LR 30
91
92 #define SPELL_REG_SP "sp"
93 #define SPELL_REG_FP "x29"
94 #endif
95
96 address os::current_stack_pointer() {
97 register void *esp __asm__ (SPELL_REG_SP);
98 return (address) esp;
99 }
100
101 char* os::non_memory_address_word() {
102 // Must never look like an address returned by reserve_memory,
103 // even in its subfields (as defined by the CPU immediate fields,
104 // if the CPU splits constants across multiple instructions).
105
106 return (char*) 0xffffffffffff;
107 }
108
109 address os::Linux::ucontext_get_pc(const ucontext_t * uc) {
110 #ifdef BUILTIN_SIM
111 return (address)uc->uc_mcontext.gregs[REG_PC];
112 #else
113 return (address)uc->uc_mcontext.pc;
114 #endif
115 }
116
117 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
118 #ifdef BUILTIN_SIM
119 uc->uc_mcontext.gregs[REG_PC] = (intptr_t)pc;
120 #else
121 uc->uc_mcontext.pc = (intptr_t)pc;
122 #endif
123 }
124
125 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) {
126 #ifdef BUILTIN_SIM
127 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
128 #else
129 return (intptr_t*)uc->uc_mcontext.sp;
130 #endif
131 }
132
133 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) {
134 #ifdef BUILTIN_SIM
135 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
136 #else
137 return (intptr_t*)uc->uc_mcontext.regs[REG_FP];
138 #endif
139 }
140
141 // For Forte Analyzer AsyncGetCallTrace profiling support - thread
142 // is currently interrupted by SIGPROF.
143 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal
144 // frames. Currently we don't do that on Linux, so it's the same as
145 // os::fetch_frame_from_context().
146 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,
147 const ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
148
149 assert(thread != NULL, "just checking");
150 assert(ret_sp != NULL, "just checking");
151 assert(ret_fp != NULL, "just checking");
152
153 return os::fetch_frame_from_context(uc, ret_sp, ret_fp);
154 }
155
156 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
157 intptr_t** ret_sp, intptr_t** ret_fp) {
158
159 ExtendedPC epc;
160 const ucontext_t* uc = (const ucontext_t*)ucVoid;
161
162 if (uc != NULL) {
163 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
164 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc);
165 if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc);
166 } else {
167 // construct empty ExtendedPC for return value checking
168 epc = ExtendedPC(NULL);
169 if (ret_sp) *ret_sp = (intptr_t *)NULL;
170 if (ret_fp) *ret_fp = (intptr_t *)NULL;
171 }
172
173 return epc;
174 }
175
176 frame os::fetch_frame_from_context(const void* ucVoid) {
177 intptr_t* sp;
178 intptr_t* fp;
179 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
180 return frame(sp, fp, epc.pc());
181 }
182
183 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
184 address pc = (address) os::Linux::ucontext_get_pc(uc);
185 if (Interpreter::contains(pc)) {
186 // interpreter performs stack banging after the fixed frame header has
187 // been generated while the compilers perform it before. To maintain
188 // semantic consistency between interpreted and compiled frames, the
189 // method returns the Java sender of the current frame.
190 *fr = os::fetch_frame_from_context(uc);
191 if (!fr->is_first_java_frame()) {
192 assert(fr->safe_for_sender(thread), "Safety check");
193 *fr = fr->java_sender();
194 }
195 } else {
196 // more complex code with compiled code
197 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
198 CodeBlob* cb = CodeCache::find_blob(pc);
199 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
200 // Not sure where the pc points to, fallback to default
201 // stack overflow handling
202 return false;
203 } else {
204 // In compiled code, the stack banging is performed before LR
205 // has been saved in the frame. LR is live, and SP and FP
206 // belong to the caller.
207 intptr_t* fp = os::Linux::ucontext_get_fp(uc);
208 intptr_t* sp = os::Linux::ucontext_get_sp(uc);
209 address pc = (address)(uc->uc_mcontext.regs[REG_LR]
210 - NativeInstruction::instruction_size);
211 *fr = frame(sp, fp, pc);
212 if (!fr->is_java_frame()) {
213 assert(fr->safe_for_sender(thread), "Safety check");
214 assert(!fr->is_first_frame(), "Safety check");
215 *fr = fr->java_sender();
216 }
217 }
218 }
219 assert(fr->is_java_frame(), "Safety check");
220 return true;
221 }
222
223 // By default, gcc always saves frame pointer rfp on this stack. This
224 // may get turned off by -fomit-frame-pointer.
225 frame os::get_sender_for_C_frame(frame* fr) {
226 #ifdef BUILTIN_SIM
227 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
228 #else
229 return frame(fr->link(), fr->link(), fr->sender_pc());
230 #endif
231 }
232
233 intptr_t* _get_previous_fp() {
234 register intptr_t **fp __asm__ (SPELL_REG_FP);
235
236 // fp is for this frame (_get_previous_fp). We want the fp for the
237 // caller of os::current_frame*(), so go up two frames. However, for
238 // optimized builds, _get_previous_fp() will be inlined, so only go
239 // up 1 frame in that case.
240 #ifdef _NMT_NOINLINE_
241 return **(intptr_t***)fp;
242 #else
243 return *fp;
244 #endif
245 }
246
247
248 frame os::current_frame() {
249 intptr_t* fp = _get_previous_fp();
250 frame myframe((intptr_t*)os::current_stack_pointer(),
251 (intptr_t*)fp,
252 CAST_FROM_FN_PTR(address, os::current_frame));
253 if (os::is_first_C_frame(&myframe)) {
254 // stack is not walkable
255 return frame();
256 } else {
257 return os::get_sender_for_C_frame(&myframe);
258 }
259 }
260
261 // Utility functions
262
263 // From IA32 System Programming Guide
264 enum {
265 trap_page_fault = 0xE
266 };
267
268 #ifdef BUILTIN_SIM
269 extern "C" void Fetch32PFI () ;
270 extern "C" void Fetch32Resume () ;
271 extern "C" void FetchNPFI () ;
272 extern "C" void FetchNResume () ;
273 #endif
274
275 extern "C" JNIEXPORT int
276 JVM_handle_linux_signal(int sig,
277 siginfo_t* info,
278 void* ucVoid,
279 int abort_if_unrecognized) {
280 ucontext_t* uc = (ucontext_t*) ucVoid;
281
282 Thread* t = Thread::current_or_null_safe();
283
284 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
285 // (no destructors can be run)
286 os::ThreadCrashProtection::check_crash_protection(sig, t);
287
288 SignalHandlerMark shm(t);
289
290 // Note: it's not uncommon that JNI code uses signal/sigset to install
291 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
292 // or have a SIGILL handler when detecting CPU type). When that happens,
293 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
294 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
295 // that do not require siginfo/ucontext first.
296
297 if (sig == SIGPIPE || sig == SIGXFSZ) {
298 // allow chained handler to go first
299 if (os::Linux::chained_handler(sig, info, ucVoid)) {
300 return true;
301 } else {
302 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219
303 return true;
304 }
305 }
306
307 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT
308 if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) {
309 handle_assert_poison_fault(ucVoid, info->si_addr);
310 return 1;
311 }
312 #endif
313
314 JavaThread* thread = NULL;
315 VMThread* vmthread = NULL;
316 if (os::Linux::signal_handlers_are_installed) {
317 if (t != NULL ){
318 if(t->is_Java_thread()) {
319 thread = (JavaThread*)t;
320 }
321 else if(t->is_VM_thread()){
322 vmthread = (VMThread *)t;
323 }
324 }
325 }
326 /*
327 NOTE: does not seem to work on linux.
328 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
329 // can't decode this kind of signal
330 info = NULL;
331 } else {
332 assert(sig == info->si_signo, "bad siginfo");
333 }
334 */
335 // decide if this trap can be handled by a stub
336 address stub = NULL;
337
338 address pc = NULL;
339
340 //%note os_trap_1
341 if (info != NULL && uc != NULL && thread != NULL) {
342 pc = (address) os::Linux::ucontext_get_pc(uc);
343
344 #ifdef BUILTIN_SIM
345 if (pc == (address) Fetch32PFI) {
346 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;
347 return 1 ;
348 }
349 if (pc == (address) FetchNPFI) {
350 uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ;
351 return 1 ;
352 }
353 #else
354 if (StubRoutines::is_safefetch_fault(pc)) {
355 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
356 return 1;
357 }
358 #endif
359
360 // Handle ALL stack overflow variations here
361 if (sig == SIGSEGV) {
362 address addr = (address) info->si_addr;
363
364 // check if fault address is within thread stack
365 if (thread->on_local_stack(addr)) {
366 // stack overflow
367 if (thread->in_stack_yellow_reserved_zone(addr)) {
368 thread->disable_stack_yellow_reserved_zone();
369 if (thread->thread_state() == _thread_in_Java) {
370 if (thread->in_stack_reserved_zone(addr)) {
371 frame fr;
372 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) {
373 assert(fr.is_java_frame(), "Must be a Java frame");
374 frame activation =
375 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
376 if (activation.sp() != NULL) {
377 thread->disable_stack_reserved_zone();
378 if (activation.is_interpreted_frame()) {
379 thread->set_reserved_stack_activation((address)(
380 activation.fp() + frame::interpreter_frame_initial_sp_offset));
381 } else {
382 thread->set_reserved_stack_activation((address)activation.unextended_sp());
383 }
384 return 1;
385 }
386 }
387 }
388 // Throw a stack overflow exception. Guard pages will be reenabled
389 // while unwinding the stack.
390 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
391 } else {
392 // Thread was in the vm or native code. Return and try to finish.
393 return 1;
394 }
395 } else if (thread->in_stack_red_zone(addr)) {
396 // Fatal red zone violation. Disable the guard pages and fall through
397 // to handle_unexpected_exception way down below.
398 thread->disable_stack_red_zone();
399 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
400
401 // This is a likely cause, but hard to verify. Let's just print
402 // it as a hint.
403 tty->print_raw_cr("Please check if any of your loaded .so files has "
404 "enabled executable stack (see man page execstack(8))");
405 } else {
406 // Accessing stack address below sp may cause SEGV if current
407 // thread has MAP_GROWSDOWN stack. This should only happen when
408 // current thread was created by user code with MAP_GROWSDOWN flag
409 // and then attached to VM. See notes in os_linux.cpp.
410 if (thread->osthread()->expanding_stack() == 0) {
411 thread->osthread()->set_expanding_stack();
412 if (os::Linux::manually_expand_stack(thread, addr)) {
413 thread->osthread()->clear_expanding_stack();
414 return 1;
415 }
416 thread->osthread()->clear_expanding_stack();
417 } else {
418 fatal("recursive segv. expanding stack.");
419 }
420 }
421 }
422 }
423
424 if (thread->thread_state() == _thread_in_Java) {
425 // Java thread running in Java code => find exception handler if any
426 // a fault inside compiled code, the interpreter, or a stub
427
428 // Handle signal from NativeJump::patch_verified_entry().
429 if ((sig == SIGILL || sig == SIGTRAP)
430 && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) {
431 if (TraceTraps) {
432 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL");
433 }
434 stub = SharedRuntime::get_handle_wrong_method_stub();
435 } else if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
436 stub = SharedRuntime::get_poll_stub(pc);
437 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) {
438 // BugId 4454115: A read from a MappedByteBuffer can fault
439 // here if the underlying file has been truncated.
440 // Do not crash the VM in such a case.
441 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
442 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
443 if (nm != NULL && nm->has_unsafe_access()) {
444 address next_pc = pc + NativeCall::instruction_size;
445 stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
446 }
447 }
448 else
449
450 if (sig == SIGFPE &&
451 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) {
452 stub =
453 SharedRuntime::
454 continuation_for_implicit_exception(thread,
455 pc,
456 SharedRuntime::
457 IMPLICIT_DIVIDE_BY_ZERO);
458 } else if (sig == SIGSEGV &&
459 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
460 // Determination of interpreter/vtable stub/compiled code null exception
461 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
462 }
463 } else if (thread->thread_state() == _thread_in_vm &&
464 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */
465 thread->doing_unsafe_access()) {
466 address next_pc = pc + NativeCall::instruction_size;
467 stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
468 }
469
470 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
471 // and the heap gets shrunk before the field access.
472 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
473 address addr = JNI_FastGetField::find_slowcase_pc(pc);
474 if (addr != (address)-1) {
475 stub = addr;
476 }
477 }
478
479 // Check to see if we caught the safepoint code in the
480 // process of write protecting the memory serialization page.
481 // It write enables the page immediately after protecting it
482 // so we can just return to retry the write.
483 if ((sig == SIGSEGV) &&
484 os::is_memory_serialize_page(thread, (address) info->si_addr)) {
485 // Block current thread until the memory serialize page permission restored.
486 os::block_on_serialize_page_trap();
487 return true;
488 }
489 }
490
491 if (stub != NULL) {
492 // save all thread context in case we need to restore it
493 if (thread != NULL) thread->set_saved_exception_pc(pc);
494
495 os::Linux::ucontext_set_pc(uc, stub);
496 return true;
497 }
498
499 // signal-chaining
500 if (os::Linux::chained_handler(sig, info, ucVoid)) {
501 return true;
502 }
503
504 if (!abort_if_unrecognized) {
505 // caller wants another chance, so give it to him
506 return false;
507 }
508
509 if (pc == NULL && uc != NULL) {
510 pc = os::Linux::ucontext_get_pc(uc);
511 }
512
513 // unmask current signal
514 sigset_t newset;
515 sigemptyset(&newset);
516 sigaddset(&newset, sig);
517 sigprocmask(SIG_UNBLOCK, &newset, NULL);
518
519 VMError::report_and_die(t, sig, pc, info, ucVoid);
520
521 ShouldNotReachHere();
522 return true; // Mute compiler
523 }
524
525 void os::Linux::init_thread_fpu_state(void) {
526 }
527
528 int os::Linux::get_fpu_control_word(void) {
529 return 0;
530 }
531
532 void os::Linux::set_fpu_control_word(int fpu_control) {
533 }
534
535 // Check that the linux kernel version is 2.4 or higher since earlier
536 // versions do not support SSE without patches.
537 bool os::supports_sse() {
538 return true;
539 }
540
541 bool os::is_allocatable(size_t bytes) {
542 return true;
543 }
544
545 ////////////////////////////////////////////////////////////////////////////////
546 // thread stack
547
548 // Minimum usable stack sizes required to get to user code. Space for
549 // HotSpot guard pages is added later.
550 size_t os::Posix::_compiler_thread_min_stack_allowed = 72 * K;
551 size_t os::Posix::_java_thread_min_stack_allowed = 72 * K;
552 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 72 * K;
553
554 // return default stack size for thr_type
555 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
556 // default stack size (compiler thread needs larger stack)
557 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
558 return s;
559 }
560
561 /////////////////////////////////////////////////////////////////////////////
562 // helper functions for fatal error handler
563
564 void os::print_context(outputStream *st, const void *context) {
565 if (context == NULL) return;
566
567 const ucontext_t *uc = (const ucontext_t*)context;
568 st->print_cr("Registers:");
569 #ifdef BUILTIN_SIM
570 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
571 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
572 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
573 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
574 st->cr();
575 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
576 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
577 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
578 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
579 st->cr();
580 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
581 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
582 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
583 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
584 st->cr();
585 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
586 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
587 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
588 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
589 st->cr();
590 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
591 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]);
592 st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]);
593 st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]);
594 st->cr();
595 st->print(" TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]);
596 st->cr();
597 #else
598 for (int r = 0; r < 31; r++) {
599 st->print("R%-2d=", r);
600 print_location(st, uc->uc_mcontext.regs[r]);
601 }
602 #endif
603 st->cr();
604
605 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
606 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp));
607 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
608 st->cr();
609
610 // Note: it may be unsafe to inspect memory near pc. For example, pc may
611 // point to garbage if entry point in an nmethod is corrupted. Leave
612 // this at the end, and hope for the best.
613 address pc = os::Linux::ucontext_get_pc(uc);
614 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc));
615 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
616 }
617
618 void os::print_register_info(outputStream *st, const void *context) {
619 if (context == NULL) return;
620
621 const ucontext_t *uc = (const ucontext_t*)context;
622
623 st->print_cr("Register to memory mapping:");
624 st->cr();
625
626 // this is horrendously verbose but the layout of the registers in the
627 // context does not match how we defined our abstract Register set, so
628 // we can't just iterate through the gregs area
629
630 // this is only for the "general purpose" registers
631
632 #ifdef BUILTIN_SIM
633 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]);
634 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]);
635 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]);
636 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]);
637 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]);
638 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]);
639 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]);
640 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]);
641 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]);
642 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]);
643 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]);
644 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]);
645 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]);
646 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]);
647 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]);
648 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]);
649 #else
650 for (int r = 0; r < 31; r++)
651 st->print_cr( "R%d=" INTPTR_FORMAT, r, (uintptr_t)uc->uc_mcontext.regs[r]);
652 #endif
653 st->cr();
654 }
655
656 void os::setup_fpu() {
657 }
658
659 #ifndef PRODUCT
660 void os::verify_stack_alignment() {
661 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
662 }
663 #endif
664
665 int os::extra_bang_size_in_bytes() {
666 // AArch64 does not require the additional stack bang.
667 return 0;
668 }
669
670 extern "C" {
671 int SpinPause() {
672 return 0;
673 }
674
675 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
676 if (from > to) {
677 jshort *end = from + count;
678 while (from < end)
679 *(to++) = *(from++);
680 }
681 else if (from < to) {
682 jshort *end = from;
683 from += count - 1;
684 to += count - 1;
685 while (from >= end)
686 *(to--) = *(from--);
687 }
688 }
689 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) {
690 if (from > to) {
691 jint *end = from + count;
692 while (from < end)
693 *(to++) = *(from++);
694 }
695 else if (from < to) {
696 jint *end = from;
697 from += count - 1;
698 to += count - 1;
699 while (from >= end)
700 *(to--) = *(from--);
701 }
702 }
703 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
704 if (from > to) {
705 jlong *end = from + count;
706 while (from < end)
707 os::atomic_copy64(from++, to++);
708 }
709 else if (from < to) {
710 jlong *end = from;
711 from += count - 1;
712 to += count - 1;
713 while (from >= end)
714 os::atomic_copy64(from--, to--);
715 }
716 }
717
718 void _Copy_arrayof_conjoint_bytes(HeapWord* from,
719 HeapWord* to,
720 size_t count) {
721 memmove(to, from, count);
722 }
723 void _Copy_arrayof_conjoint_jshorts(HeapWord* from,
724 HeapWord* to,
725 size_t count) {
726 memmove(to, from, count * 2);
727 }
728 void _Copy_arrayof_conjoint_jints(HeapWord* from,
729 HeapWord* to,
730 size_t count) {
731 memmove(to, from, count * 4);
732 }
733 void _Copy_arrayof_conjoint_jlongs(HeapWord* from,
734 HeapWord* to,
735 size_t count) {
736 memmove(to, from, count * 8);
737 }
738 };