1 /*
2 * Copyright (c) 1999, 2017, 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.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/events.hpp"
54 #include "utilities/vmError.hpp"
55 #ifdef BUILTIN_SIM
56 #include "../../../../../../simulator/simulator.hpp"
57 #endif
58
59 // put OS-includes here
60 # include <sys/types.h>
61 # include <sys/mman.h>
62 # include <pthread.h>
63 # include <signal.h>
64 # include <errno.h>
65 # include <dlfcn.h>
66 # include <stdlib.h>
67 # include <stdio.h>
68 # include <unistd.h>
69 # include <sys/resource.h>
70 # include <pthread.h>
71 # include <sys/stat.h>
72 # include <sys/time.h>
73 # include <sys/utsname.h>
74 # include <sys/socket.h>
75 # include <sys/wait.h>
76 # include <pwd.h>
77 # include <poll.h>
78 # include <ucontext.h>
79 # include <fpu_control.h>
80
81 #ifdef BUILTIN_SIM
82 #define REG_SP REG_RSP
83 #define REG_PC REG_RIP
84 #define REG_FP REG_RBP
85 #define SPELL_REG_SP "rsp"
86 #define SPELL_REG_FP "rbp"
87 #else
88 #define REG_FP 29
89 #define REG_LR 30
90
91 #define SPELL_REG_SP "sp"
92 #define SPELL_REG_FP "x29"
93 #endif
94
95 address os::current_stack_pointer() {
96 register void *esp __asm__ (SPELL_REG_SP);
97 return (address) esp;
98 }
99
100 char* os::non_memory_address_word() {
101 // Must never look like an address returned by reserve_memory,
102 // even in its subfields (as defined by the CPU immediate fields,
103 // if the CPU splits constants across multiple instructions).
104
105 return (char*) 0xffffffffffff;
106 }
107
108 void os::initialize_thread(Thread *thr) {
109 }
110
111 address os::Linux::ucontext_get_pc(const ucontext_t * uc) {
112 #ifdef BUILTIN_SIM
113 return (address)uc->uc_mcontext.gregs[REG_PC];
114 #else
115 return (address)uc->uc_mcontext.pc;
116 #endif
117 }
118
119 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
120 #ifdef BUILTIN_SIM
121 uc->uc_mcontext.gregs[REG_PC] = (intptr_t)pc;
122 #else
123 uc->uc_mcontext.pc = (intptr_t)pc;
124 #endif
125 }
126
127 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) {
128 #ifdef BUILTIN_SIM
129 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
130 #else
131 return (intptr_t*)uc->uc_mcontext.sp;
132 #endif
133 }
134
135 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) {
136 #ifdef BUILTIN_SIM
137 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
138 #else
139 return (intptr_t*)uc->uc_mcontext.regs[REG_FP];
140 #endif
141 }
142
143 // For Forte Analyzer AsyncGetCallTrace profiling support - thread
144 // is currently interrupted by SIGPROF.
145 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal
146 // frames. Currently we don't do that on Linux, so it's the same as
147 // os::fetch_frame_from_context().
148 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,
149 const ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
150
151 assert(thread != NULL, "just checking");
152 assert(ret_sp != NULL, "just checking");
153 assert(ret_fp != NULL, "just checking");
154
155 return os::fetch_frame_from_context(uc, ret_sp, ret_fp);
156 }
157
158 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
159 intptr_t** ret_sp, intptr_t** ret_fp) {
160
161 ExtendedPC epc;
162 const ucontext_t* uc = (const ucontext_t*)ucVoid;
163
164 if (uc != NULL) {
165 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
166 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc);
167 if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc);
168 } else {
169 // construct empty ExtendedPC for return value checking
170 epc = ExtendedPC(NULL);
171 if (ret_sp) *ret_sp = (intptr_t *)NULL;
172 if (ret_fp) *ret_fp = (intptr_t *)NULL;
173 }
174
175 return epc;
176 }
177
178 frame os::fetch_frame_from_context(const void* ucVoid) {
179 intptr_t* sp;
180 intptr_t* fp;
181 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
182 return frame(sp, fp, epc.pc());
183 }
184
185 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
186 address pc = (address) os::Linux::ucontext_get_pc(uc);
187 if (Interpreter::contains(pc)) {
188 // interpreter performs stack banging after the fixed frame header has
189 // been generated while the compilers perform it before. To maintain
190 // semantic consistency between interpreted and compiled frames, the
191 // method returns the Java sender of the current frame.
192 *fr = os::fetch_frame_from_context(uc);
193 if (!fr->is_first_java_frame()) {
194 assert(fr->safe_for_sender(thread), "Safety check");
195 *fr = fr->java_sender();
196 }
197 } else {
198 // more complex code with compiled code
199 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
200 CodeBlob* cb = CodeCache::find_blob(pc);
201 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
202 // Not sure where the pc points to, fallback to default
203 // stack overflow handling
204 return false;
205 } else {
206 // In compiled code, the stack banging is performed before LR
207 // has been saved in the frame. LR is live, and SP and FP
208 // belong to the caller.
209 intptr_t* fp = os::Linux::ucontext_get_fp(uc);
210 intptr_t* sp = os::Linux::ucontext_get_sp(uc);
211 address pc = (address)(uc->uc_mcontext.regs[REG_LR]
212 - NativeInstruction::instruction_size);
213 *fr = frame(sp, fp, pc);
214 if (!fr->is_java_frame()) {
215 assert(fr->safe_for_sender(thread), "Safety check");
216 assert(!fr->is_first_frame(), "Safety check");
217 *fr = fr->java_sender();
218 }
219 }
220 }
221 assert(fr->is_java_frame(), "Safety check");
222 return true;
223 }
224
225 // By default, gcc always saves frame pointer rfp on this stack. This
226 // may get turned off by -fomit-frame-pointer.
227 frame os::get_sender_for_C_frame(frame* fr) {
228 #ifdef BUILTIN_SIM
229 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
230 #else
231 return frame(fr->link(), fr->link(), fr->sender_pc());
232 #endif
233 }
234
235 intptr_t* _get_previous_fp() {
236 register intptr_t **ebp __asm__ (SPELL_REG_FP);
237 return (intptr_t*) *ebp; // we want what it points to.
238 }
239
240
241 frame os::current_frame() {
242 intptr_t* fp = _get_previous_fp();
243 frame myframe((intptr_t*)os::current_stack_pointer(),
244 (intptr_t*)fp,
245 CAST_FROM_FN_PTR(address, os::current_frame));
246 if (os::is_first_C_frame(&myframe)) {
247 // stack is not walkable
248 return frame();
249 } else {
250 return os::get_sender_for_C_frame(&myframe);
251 }
252 }
253
254 // Utility functions
255
256 // From IA32 System Programming Guide
257 enum {
258 trap_page_fault = 0xE
259 };
260
261 #ifdef BUILTIN_SIM
262 extern "C" void Fetch32PFI () ;
263 extern "C" void Fetch32Resume () ;
264 extern "C" void FetchNPFI () ;
265 extern "C" void FetchNResume () ;
266 #endif
267
268 extern "C" JNIEXPORT int
269 JVM_handle_linux_signal(int sig,
270 siginfo_t* info,
271 void* ucVoid,
272 int abort_if_unrecognized) {
273 ucontext_t* uc = (ucontext_t*) ucVoid;
274
275 Thread* t = Thread::current_or_null_safe();
276
277 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
278 // (no destructors can be run)
279 os::ThreadCrashProtection::check_crash_protection(sig, t);
280
281 SignalHandlerMark shm(t);
282
283 // Note: it's not uncommon that JNI code uses signal/sigset to install
284 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
285 // or have a SIGILL handler when detecting CPU type). When that happens,
286 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
287 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
288 // that do not require siginfo/ucontext first.
289
290 if (sig == SIGPIPE || sig == SIGXFSZ) {
291 // allow chained handler to go first
292 if (os::Linux::chained_handler(sig, info, ucVoid)) {
293 return true;
294 } else {
295 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219
296 return true;
297 }
298 }
299
300 JavaThread* thread = NULL;
301 VMThread* vmthread = NULL;
302 if (os::Linux::signal_handlers_are_installed) {
303 if (t != NULL ){
304 if(t->is_Java_thread()) {
305 thread = (JavaThread*)t;
306 }
307 else if(t->is_VM_thread()){
308 vmthread = (VMThread *)t;
309 }
310 }
311 }
312 /*
313 NOTE: does not seem to work on linux.
314 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
315 // can't decode this kind of signal
316 info = NULL;
317 } else {
318 assert(sig == info->si_signo, "bad siginfo");
319 }
320 */
321 // decide if this trap can be handled by a stub
322 address stub = NULL;
323
324 address pc = NULL;
325
326 //%note os_trap_1
327 if (info != NULL && uc != NULL && thread != NULL) {
328 pc = (address) os::Linux::ucontext_get_pc(uc);
329
330 #ifdef BUILTIN_SIM
331 if (pc == (address) Fetch32PFI) {
332 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;
333 return 1 ;
334 }
335 if (pc == (address) FetchNPFI) {
336 uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ;
337 return 1 ;
338 }
339 #else
340 if (StubRoutines::is_safefetch_fault(pc)) {
341 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
342 return 1;
343 }
344 #endif
345
346 // Handle ALL stack overflow variations here
347 if (sig == SIGSEGV) {
348 address addr = (address) info->si_addr;
349
350 // check if fault address is within thread stack
351 if (thread->on_local_stack(addr)) {
352 // stack overflow
353 if (thread->in_stack_yellow_reserved_zone(addr)) {
354 thread->disable_stack_yellow_reserved_zone();
355 if (thread->thread_state() == _thread_in_Java) {
356 if (thread->in_stack_reserved_zone(addr)) {
357 frame fr;
358 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) {
359 assert(fr.is_java_frame(), "Must be a Java frame");
360 frame activation =
361 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
362 if (activation.sp() != NULL) {
363 thread->disable_stack_reserved_zone();
364 if (activation.is_interpreted_frame()) {
365 thread->set_reserved_stack_activation((address)(
366 activation.fp() + frame::interpreter_frame_initial_sp_offset));
367 } else {
368 thread->set_reserved_stack_activation((address)activation.unextended_sp());
369 }
370 return 1;
371 }
372 }
373 }
374 // Throw a stack overflow exception. Guard pages will be reenabled
375 // while unwinding the stack.
376 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
377 } else {
378 // Thread was in the vm or native code. Return and try to finish.
379 return 1;
380 }
381 } else if (thread->in_stack_red_zone(addr)) {
382 // Fatal red zone violation. Disable the guard pages and fall through
383 // to handle_unexpected_exception way down below.
384 thread->disable_stack_red_zone();
385 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
386
387 // This is a likely cause, but hard to verify. Let's just print
388 // it as a hint.
389 tty->print_raw_cr("Please check if any of your loaded .so files has "
390 "enabled executable stack (see man page execstack(8))");
391 } else {
392 // Accessing stack address below sp may cause SEGV if current
393 // thread has MAP_GROWSDOWN stack. This should only happen when
394 // current thread was created by user code with MAP_GROWSDOWN flag
395 // and then attached to VM. See notes in os_linux.cpp.
396 if (thread->osthread()->expanding_stack() == 0) {
397 thread->osthread()->set_expanding_stack();
398 if (os::Linux::manually_expand_stack(thread, addr)) {
399 thread->osthread()->clear_expanding_stack();
400 return 1;
401 }
402 thread->osthread()->clear_expanding_stack();
403 } else {
404 fatal("recursive segv. expanding stack.");
405 }
406 }
407 }
408 }
409
410 if (thread->thread_state() == _thread_in_Java) {
411 // Java thread running in Java code => find exception handler if any
412 // a fault inside compiled code, the interpreter, or a stub
413
414 // Handle signal from NativeJump::patch_verified_entry().
415 if ((sig == SIGILL || sig == SIGTRAP)
416 && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) {
417 if (TraceTraps) {
418 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL");
419 }
420 stub = SharedRuntime::get_handle_wrong_method_stub();
421 } else if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
422 stub = SharedRuntime::get_poll_stub(pc);
423 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) {
424 // BugId 4454115: A read from a MappedByteBuffer can fault
425 // here if the underlying file has been truncated.
426 // Do not crash the VM in such a case.
427 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
428 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
429 if (nm != NULL && nm->has_unsafe_access()) {
430 address next_pc = pc + NativeCall::instruction_size;
431 stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
432 }
433 }
434 else
435
436 if (sig == SIGFPE &&
437 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) {
438 stub =
439 SharedRuntime::
440 continuation_for_implicit_exception(thread,
441 pc,
442 SharedRuntime::
443 IMPLICIT_DIVIDE_BY_ZERO);
444 } else if (sig == SIGSEGV &&
445 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
446 // Determination of interpreter/vtable stub/compiled code null exception
447 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
448 }
449 } else if (thread->thread_state() == _thread_in_vm &&
450 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */
451 thread->doing_unsafe_access()) {
452 address next_pc = pc + NativeCall::instruction_size;
453 stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
454 }
455
456 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
457 // and the heap gets shrunk before the field access.
458 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
459 address addr = JNI_FastGetField::find_slowcase_pc(pc);
460 if (addr != (address)-1) {
461 stub = addr;
462 }
463 }
464
465 // Check to see if we caught the safepoint code in the
466 // process of write protecting the memory serialization page.
467 // It write enables the page immediately after protecting it
468 // so we can just return to retry the write.
469 if ((sig == SIGSEGV) &&
470 os::is_memory_serialize_page(thread, (address) info->si_addr)) {
471 // Block current thread until the memory serialize page permission restored.
472 os::block_on_serialize_page_trap();
473 return true;
474 }
475 }
476
477 if (stub != NULL) {
478 // save all thread context in case we need to restore it
479 if (thread != NULL) thread->set_saved_exception_pc(pc);
480
481 os::Linux::ucontext_set_pc(uc, stub);
482 return true;
483 }
484
485 // signal-chaining
486 if (os::Linux::chained_handler(sig, info, ucVoid)) {
487 return true;
488 }
489
490 if (!abort_if_unrecognized) {
491 // caller wants another chance, so give it to him
492 return false;
493 }
494
495 if (pc == NULL && uc != NULL) {
496 pc = os::Linux::ucontext_get_pc(uc);
497 }
498
499 // unmask current signal
500 sigset_t newset;
501 sigemptyset(&newset);
502 sigaddset(&newset, sig);
503 sigprocmask(SIG_UNBLOCK, &newset, NULL);
504
505 VMError::report_and_die(t, sig, pc, info, ucVoid);
506
507 ShouldNotReachHere();
508 return true; // Mute compiler
509 }
510
511 void os::Linux::init_thread_fpu_state(void) {
512 }
513
514 int os::Linux::get_fpu_control_word(void) {
515 return 0;
516 }
517
518 void os::Linux::set_fpu_control_word(int fpu_control) {
519 }
520
521 // Check that the linux kernel version is 2.4 or higher since earlier
522 // versions do not support SSE without patches.
523 bool os::supports_sse() {
524 return true;
525 }
526
527 bool os::is_allocatable(size_t bytes) {
528 return true;
529 }
530
531 ////////////////////////////////////////////////////////////////////////////////
532 // thread stack
533
534 // Minimum usable stack sizes required to get to user code. Space for
535 // HotSpot guard pages is added later.
536 size_t os::Posix::_compiler_thread_min_stack_allowed = 72 * K;
537 size_t os::Posix::_java_thread_min_stack_allowed = 72 * K;
538 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 72 * K;
539
540 // return default stack size for thr_type
541 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
542 // default stack size (compiler thread needs larger stack)
543 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
544 return s;
545 }
546
547 /////////////////////////////////////////////////////////////////////////////
548 // helper functions for fatal error handler
549
550 void os::print_context(outputStream *st, const void *context) {
551 if (context == NULL) return;
552
553 const ucontext_t *uc = (const ucontext_t*)context;
554 st->print_cr("Registers:");
555 #ifdef BUILTIN_SIM
556 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
557 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
558 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
559 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
560 st->cr();
561 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
562 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
563 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
564 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
565 st->cr();
566 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
567 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
568 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
569 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
570 st->cr();
571 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
572 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
573 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
574 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
575 st->cr();
576 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
577 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]);
578 st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]);
579 st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]);
580 st->cr();
581 st->print(" TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]);
582 st->cr();
583 #else
584 for (int r = 0; r < 31; r++) {
585 st->print("R%-2d=", r);
586 print_location(st, uc->uc_mcontext.regs[r]);
587 }
588 #endif
589 st->cr();
590
591 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
592 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp));
593 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
594 st->cr();
595
596 // Note: it may be unsafe to inspect memory near pc. For example, pc may
597 // point to garbage if entry point in an nmethod is corrupted. Leave
598 // this at the end, and hope for the best.
599 address pc = os::Linux::ucontext_get_pc(uc);
600 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc));
601 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
602 }
603
604 void os::print_register_info(outputStream *st, const void *context) {
605 if (context == NULL) return;
606
607 const ucontext_t *uc = (const ucontext_t*)context;
608
609 st->print_cr("Register to memory mapping:");
610 st->cr();
611
612 // this is horrendously verbose but the layout of the registers in the
613 // context does not match how we defined our abstract Register set, so
614 // we can't just iterate through the gregs area
615
616 // this is only for the "general purpose" registers
617
618 #ifdef BUILTIN_SIM
619 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]);
620 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]);
621 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]);
622 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]);
623 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]);
624 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]);
625 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]);
626 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]);
627 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]);
628 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]);
629 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]);
630 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]);
631 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]);
632 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]);
633 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]);
634 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]);
635 #else
636 for (int r = 0; r < 31; r++)
637 st->print_cr( "R%d=" INTPTR_FORMAT, r, (uintptr_t)uc->uc_mcontext.regs[r]);
638 #endif
639 st->cr();
640 }
641
642 void os::setup_fpu() {
643 }
644
645 #ifndef PRODUCT
646 void os::verify_stack_alignment() {
647 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
648 }
649 #endif
650
651 int os::extra_bang_size_in_bytes() {
652 // AArch64 does not require the additional stack bang.
653 return 0;
654 }
655
656 extern "C" {
657 int SpinPause() {
658 return 0;
659 }
660
661 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
662 if (from > to) {
663 jshort *end = from + count;
664 while (from < end)
665 *(to++) = *(from++);
666 }
667 else if (from < to) {
668 jshort *end = from;
669 from += count - 1;
670 to += count - 1;
671 while (from >= end)
672 *(to--) = *(from--);
673 }
674 }
675 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) {
676 if (from > to) {
677 jint *end = from + count;
678 while (from < end)
679 *(to++) = *(from++);
680 }
681 else if (from < to) {
682 jint *end = from;
683 from += count - 1;
684 to += count - 1;
685 while (from >= end)
686 *(to--) = *(from--);
687 }
688 }
689 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
690 if (from > to) {
691 jlong *end = from + count;
692 while (from < end)
693 os::atomic_copy64(from++, to++);
694 }
695 else if (from < to) {
696 jlong *end = from;
697 from += count - 1;
698 to += count - 1;
699 while (from >= end)
700 os::atomic_copy64(from--, to--);
701 }
702 }
703
704 void _Copy_arrayof_conjoint_bytes(HeapWord* from,
705 HeapWord* to,
706 size_t count) {
707 memmove(to, from, count);
708 }
709 void _Copy_arrayof_conjoint_jshorts(HeapWord* from,
710 HeapWord* to,
711 size_t count) {
712 memmove(to, from, count * 2);
713 }
714 void _Copy_arrayof_conjoint_jints(HeapWord* from,
715 HeapWord* to,
716 size_t count) {
717 memmove(to, from, count * 4);
718 }
719 void _Copy_arrayof_conjoint_jlongs(HeapWord* from,
720 HeapWord* to,
721 size_t count) {
722 memmove(to, from, count * 8);
723 }
724 };