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 "asm/macroAssembler.hpp"

    28 #include "classfile/classLoader.hpp"

    29 #include "classfile/systemDictionary.hpp"

    30 #include "classfile/vmSymbols.hpp"

    31 #include "code/codeCache.hpp"

    32 #include "code/icBuffer.hpp"

    33 #include "code/vtableStubs.hpp"

    34 #include "code/nativeInst.hpp"

    35 #include "interpreter/interpreter.hpp"

    36 #include "jvm_linux.h"

    37 #include "memory/allocation.inline.hpp"

    38 #include "os_share_linux.hpp"

    39 #include "prims/jniFastGetField.hpp"

    40 #include "prims/jvm.h"

    41 #include "prims/jvm_misc.hpp"

    42 #include "runtime/arguments.hpp"

    43 #include "runtime/extendedPC.hpp"

    44 #include "runtime/frame.inline.hpp"

    45 #include "runtime/interfaceSupport.hpp"

    46 #include "runtime/java.hpp"

    47 #include "runtime/javaCalls.hpp"

    48 #include "runtime/mutexLocker.hpp"

    49 #include "runtime/osThread.hpp"

    50 #include "runtime/sharedRuntime.hpp"

    51 #include "runtime/stubRoutines.hpp"

    52 #include "runtime/thread.inline.hpp"

    53 #include "runtime/timer.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 void os::initialize_thread(Thread *thr) {

   110 }

   111 

   112 address os::Linux::ucontext_get_pc(const ucontext_t * uc) {

   113 #ifdef BUILTIN_SIM

   114   return (address)uc->uc_mcontext.gregs[REG_PC];

   115 #else

   116   return (address)uc->uc_mcontext.pc;

   117 #endif

   118 }

   119 

   120 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {

   121 #ifdef BUILTIN_SIM

   122   uc->uc_mcontext.gregs[REG_PC] = (intptr_t)pc;

   123 #else

   124   uc->uc_mcontext.pc = (intptr_t)pc;

   125 #endif

   126 }

   127 

   128 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) {

   129 #ifdef BUILTIN_SIM

   130   return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];

   131 #else

   132   return (intptr_t*)uc->uc_mcontext.sp;

   133 #endif

   134 }

   135 

   136 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) {

   137 #ifdef BUILTIN_SIM

   138   return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];

   139 #else

   140   return (intptr_t*)uc->uc_mcontext.regs[REG_FP];

   141 #endif

   142 }

   143 

   144 // For Forte Analyzer AsyncGetCallTrace profiling support - thread

   145 // is currently interrupted by SIGPROF.

   146 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal

   147 // frames. Currently we don't do that on Linux, so it's the same as

   148 // os::fetch_frame_from_context().

   149 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,

   150   const ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {

   151 

   152   assert(thread != NULL, "just checking");

   153   assert(ret_sp != NULL, "just checking");

   154   assert(ret_fp != NULL, "just checking");

   155 

   156   return os::fetch_frame_from_context(uc, ret_sp, ret_fp);

   157 }

   158 

   159 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,

   160                     intptr_t** ret_sp, intptr_t** ret_fp) {

   161 

   162   ExtendedPC  epc;

   163   const ucontext_t* uc = (const ucontext_t*)ucVoid;

   164 

   165   if (uc != NULL) {

   166     epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));

   167     if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc);

   168     if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc);

   169   } else {

   170     // construct empty ExtendedPC for return value checking

   171     epc = ExtendedPC(NULL);

   172     if (ret_sp) *ret_sp = (intptr_t *)NULL;

   173     if (ret_fp) *ret_fp = (intptr_t *)NULL;

   174   }

   175 

   176   return epc;

   177 }

   178 

   179 frame os::fetch_frame_from_context(const void* ucVoid) {

   180   intptr_t* sp;

   181   intptr_t* fp;

   182   ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);

   183   return frame(sp, fp, epc.pc());

   184 }

   185 

   186 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {

   187   address pc = (address) os::Linux::ucontext_get_pc(uc);

   188   if (Interpreter::contains(pc)) {

   189     // interpreter performs stack banging after the fixed frame header has

   190     // been generated while the compilers perform it before. To maintain

   191     // semantic consistency between interpreted and compiled frames, the

   192     // method returns the Java sender of the current frame.

   193     *fr = os::fetch_frame_from_context(uc);

   194     if (!fr->is_first_java_frame()) {

   195       assert(fr->safe_for_sender(thread), "Safety check");

   196       *fr = fr->java_sender();

   197     }

   198   } else {

   199     // more complex code with compiled code

   200     assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");

   201     CodeBlob* cb = CodeCache::find_blob(pc);

   202     if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {

   203       // Not sure where the pc points to, fallback to default

   204       // stack overflow handling

   205       return false;

   206     } else {

   207       // In compiled code, the stack banging is performed before LR

   208       // has been saved in the frame.  LR is live, and SP and FP

   209       // belong to the caller.

   210       intptr_t* fp = os::Linux::ucontext_get_fp(uc);

   211       intptr_t* sp = os::Linux::ucontext_get_sp(uc);

   212       address pc = (address)(uc->uc_mcontext.regs[REG_LR]

   213                          - NativeInstruction::instruction_size);

   214       *fr = frame(sp, fp, pc);

   215       if (!fr->is_java_frame()) {

   216         assert(fr->safe_for_sender(thread), "Safety check");

   217         assert(!fr->is_first_frame(), "Safety check");

   218         *fr = fr->java_sender();

   219       }

   220     }

   221   }

   222   assert(fr->is_java_frame(), "Safety check");

   223   return true;

   224 }

   225 

   226 // By default, gcc always saves frame pointer rfp on this stack. This

   227 // may get turned off by -fomit-frame-pointer.

   228 frame os::get_sender_for_C_frame(frame* fr) {

   229 #ifdef BUILTIN_SIM

   230   return frame(fr->sender_sp(), fr->link(), fr->sender_pc());

   231 #else

   232   return frame(fr->link(), fr->link(), fr->sender_pc());

   233 #endif

   234 }

   235 

   236 intptr_t* _get_previous_fp() {

   237   register intptr_t **ebp __asm__ (SPELL_REG_FP);

   238   return (intptr_t*) *ebp;   // we want what it points to.

   239 }

   240 

   241 

   242 frame os::current_frame() {

   243   intptr_t* fp = _get_previous_fp();

   244   frame myframe((intptr_t*)os::current_stack_pointer(),

   245                 (intptr_t*)fp,

   246                 CAST_FROM_FN_PTR(address, os::current_frame));

   247   if (os::is_first_C_frame(&myframe)) {

   248     // stack is not walkable

   249     return frame();

   250   } else {

   251     return os::get_sender_for_C_frame(&myframe);

   252   }

   253 }

   254 

   255 // Utility functions

   256 

   257 // From IA32 System Programming Guide

   258 enum {

   259   trap_page_fault = 0xE

   260 };

   261 

   262 #ifdef BUILTIN_SIM

   263 extern "C" void Fetch32PFI () ;

   264 extern "C" void Fetch32Resume () ;

   265 extern "C" void FetchNPFI () ;

   266 extern "C" void FetchNResume () ;

   267 #endif

   268 

   269 extern "C" JNIEXPORT int

   270 JVM_handle_linux_signal(int sig,

   271                         siginfo_t* info,

   272                         void* ucVoid,

   273                         int abort_if_unrecognized) {

   274   ucontext_t* uc = (ucontext_t*) ucVoid;

   275 

   276   Thread* t = Thread::current_or_null_safe();

   277 

   278   // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away

   279   // (no destructors can be run)

   280   os::ThreadCrashProtection::check_crash_protection(sig, t);

   281 

   282   SignalHandlerMark shm(t);

   283 

   284   // Note: it's not uncommon that JNI code uses signal/sigset to install

   285   // then restore certain signal handler (e.g. to temporarily block SIGPIPE,

   286   // or have a SIGILL handler when detecting CPU type). When that happens,

   287   // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To

   288   // avoid unnecessary crash when libjsig is not preloaded, try handle signals

   289   // that do not require siginfo/ucontext first.

   290 

   291   if (sig == SIGPIPE || sig == SIGXFSZ) {

   292     // allow chained handler to go first

   293     if (os::Linux::chained_handler(sig, info, ucVoid)) {

   294       return true;

   295     } else {

   296       // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219

   297       return true;

   298     }

   299   }

   300 

   301   JavaThread* thread = NULL;

   302   VMThread* vmthread = NULL;

   303   if (os::Linux::signal_handlers_are_installed) {

   304     if (t != NULL ){

   305       if(t->is_Java_thread()) {

   306         thread = (JavaThread*)t;

   307       }

   308       else if(t->is_VM_thread()){

   309         vmthread = (VMThread *)t;

   310       }

   311     }

   312   }

   313 /*

   314   NOTE: does not seem to work on linux.

   315   if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {

   316     // can't decode this kind of signal

   317     info = NULL;

   318   } else {

   319     assert(sig == info->si_signo, "bad siginfo");

   320   }

   321 */

   322   // decide if this trap can be handled by a stub

   323   address stub = NULL;

   324 

   325   address pc          = NULL;

   326 

   327   //%note os_trap_1

   328   if (info != NULL && uc != NULL && thread != NULL) {

   329     pc = (address) os::Linux::ucontext_get_pc(uc);

   330 

   331 #ifdef BUILTIN_SIM

   332     if (pc == (address) Fetch32PFI) {

   333        uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;

   334        return 1 ;

   335     }

   336     if (pc == (address) FetchNPFI) {

   337        uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ;

   338        return 1 ;

   339     }

   340 #else

   341     if (StubRoutines::is_safefetch_fault(pc)) {

   342       os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));

   343       return 1;

   344     }

   345 #endif

   346 

   347     // Handle ALL stack overflow variations here

   348     if (sig == SIGSEGV) {

   349       address addr = (address) info->si_addr;

   350 

   351       // check if fault address is within thread stack

   352       if (thread->on_local_stack(addr)) {

   353         // stack overflow

   354         if (thread->in_stack_yellow_reserved_zone(addr)) {

   355           thread->disable_stack_yellow_reserved_zone();

   356           if (thread->thread_state() == _thread_in_Java) {

   357             if (thread->in_stack_reserved_zone(addr)) {

   358               frame fr;

   359               if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) {

   360                 assert(fr.is_java_frame(), "Must be a Java frame");

   361                 frame activation =

   362                   SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);

   363                 if (activation.sp() != NULL) {

   364                   thread->disable_stack_reserved_zone();

   365                   if (activation.is_interpreted_frame()) {

   366                     thread->set_reserved_stack_activation((address)(

   367                       activation.fp() + frame::interpreter_frame_initial_sp_offset));

   368                   } else {

   369                     thread->set_reserved_stack_activation((address)activation.unextended_sp());

   370                   }

   371                   return 1;

   372                 }

   373               }

   374             }

   375             // Throw a stack overflow exception.  Guard pages will be reenabled

   376             // while unwinding the stack.

   377             stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);

   378           } else {

   379             // Thread was in the vm or native code.  Return and try to finish.

   380             return 1;

   381           }

   382         } else if (thread->in_stack_red_zone(addr)) {

   383           // Fatal red zone violation.  Disable the guard pages and fall through

   384           // to handle_unexpected_exception way down below.

   385           thread->disable_stack_red_zone();

   386           tty->print_raw_cr("An irrecoverable stack overflow has occurred.");

   387 

   388           // This is a likely cause, but hard to verify. Let's just print

   389           // it as a hint.

   390           tty->print_raw_cr("Please check if any of your loaded .so files has "

   391                             "enabled executable stack (see man page execstack(8))");

   392         } else {

   393           // Accessing stack address below sp may cause SEGV if current

   394           // thread has MAP_GROWSDOWN stack. This should only happen when

   395           // current thread was created by user code with MAP_GROWSDOWN flag

   396           // and then attached to VM. See notes in os_linux.cpp.

   397           if (thread->osthread()->expanding_stack() == 0) {

   398              thread->osthread()->set_expanding_stack();

   399              if (os::Linux::manually_expand_stack(thread, addr)) {

   400                thread->osthread()->clear_expanding_stack();

   401                return 1;

   402              }

   403              thread->osthread()->clear_expanding_stack();

   404           } else {

   405              fatal("recursive segv. expanding stack.");

   406           }

   407         }

   408       }

   409     }

   410 

   411     if (thread->thread_state() == _thread_in_Java) {

   412       // Java thread running in Java code => find exception handler if any

   413       // a fault inside compiled code, the interpreter, or a stub

   414 

   415       // Handle signal from NativeJump::patch_verified_entry().

   416       if ((sig == SIGILL || sig == SIGTRAP)

   417           && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) {

   418         if (TraceTraps) {

   419           tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL");

   420         }

   421         stub = SharedRuntime::get_handle_wrong_method_stub();

   422       } else if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {

   423         stub = SharedRuntime::get_poll_stub(pc);

   424       } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) {

   425         // BugId 4454115: A read from a MappedByteBuffer can fault

   426         // here if the underlying file has been truncated.

   427         // Do not crash the VM in such a case.

   428         CodeBlob* cb = CodeCache::find_blob_unsafe(pc);

   429         CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;

   430         if (nm != NULL && nm->has_unsafe_access()) {

   431           address next_pc = pc + NativeCall::instruction_size;

   432           stub = SharedRuntime::handle_unsafe_access(thread, next_pc);

   433         }

   434       }

   435       else

   436 

   437       if (sig == SIGFPE  &&

   438           (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) {

   439         stub =

   440           SharedRuntime::

   441           continuation_for_implicit_exception(thread,

   442                                               pc,

   443                                               SharedRuntime::

   444                                               IMPLICIT_DIVIDE_BY_ZERO);

   445       } else if (sig == SIGSEGV &&

   446                !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {

   447           // Determination of interpreter/vtable stub/compiled code null exception

   448           stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);

   449       }

   450     } else if (thread->thread_state() == _thread_in_vm &&

   451                sig == SIGBUS && /* info->si_code == BUS_OBJERR && */

   452                thread->doing_unsafe_access()) {

   453       address next_pc = pc + NativeCall::instruction_size;

   454       stub = SharedRuntime::handle_unsafe_access(thread, next_pc);

   455     }

   456 

   457     // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in

   458     // and the heap gets shrunk before the field access.

   459     if ((sig == SIGSEGV) || (sig == SIGBUS)) {

   460       address addr = JNI_FastGetField::find_slowcase_pc(pc);

   461       if (addr != (address)-1) {

   462         stub = addr;

   463       }

   464     }

   465 

   466     // Check to see if we caught the safepoint code in the

   467     // process of write protecting the memory serialization page.

   468     // It write enables the page immediately after protecting it

   469     // so we can just return to retry the write.

   470     if ((sig == SIGSEGV) &&

   471         os::is_memory_serialize_page(thread, (address) info->si_addr)) {

   472       // Block current thread until the memory serialize page permission restored.

   473       os::block_on_serialize_page_trap();

   474       return true;

   475     }

   476   }

   477 

   478   if (stub != NULL) {

   479     // save all thread context in case we need to restore it

   480     if (thread != NULL) thread->set_saved_exception_pc(pc);

   481 

   482     os::Linux::ucontext_set_pc(uc, stub);

   483     return true;

   484   }

   485 

   486   // signal-chaining

   487   if (os::Linux::chained_handler(sig, info, ucVoid)) {

   488      return true;

   489   }

   490 

   491   if (!abort_if_unrecognized) {

   492     // caller wants another chance, so give it to him

   493     return false;

   494   }

   495 

   496   if (pc == NULL && uc != NULL) {

   497     pc = os::Linux::ucontext_get_pc(uc);

   498   }

   499 

   500   // unmask current signal

   501   sigset_t newset;

   502   sigemptyset(&newset);

   503   sigaddset(&newset, sig);

   504   sigprocmask(SIG_UNBLOCK, &newset, NULL);

   505 

   506   VMError::report_and_die(t, sig, pc, info, ucVoid);

   507 

   508   ShouldNotReachHere();

   509   return true; // Mute compiler

   510 }

   511 

   512 void os::Linux::init_thread_fpu_state(void) {

   513 }

   514 

   515 int os::Linux::get_fpu_control_word(void) {

   516   return 0;

   517 }

   518 

   519 void os::Linux::set_fpu_control_word(int fpu_control) {

   520 }

   521 

   522 // Check that the linux kernel version is 2.4 or higher since earlier

   523 // versions do not support SSE without patches.

   524 bool os::supports_sse() {

   525   return true;

   526 }

   527 

   528 bool os::is_allocatable(size_t bytes) {

   529   return true;

   530 }

   531 

   532 ////////////////////////////////////////////////////////////////////////////////

   533 // thread stack

   534 

   535 // Minimum usable stack sizes required to get to user code. Space for

   536 // HotSpot guard pages is added later.

   537 size_t os::Posix::_compiler_thread_min_stack_allowed = 72 * K;

   538 size_t os::Posix::_java_thread_min_stack_allowed = 72 * K;

   539 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 72 * K;

   540 

   541 // return default stack size for thr_type

   542 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {

   543   // default stack size (compiler thread needs larger stack)

   544   size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);

   545   return s;

   546 }

   547 

   548 /////////////////////////////////////////////////////////////////////////////

   549 // helper functions for fatal error handler

   550 

   551 void os::print_context(outputStream *st, const void *context) {

   552   if (context == NULL) return;

   553 

   554   const ucontext_t *uc = (const ucontext_t*)context;

   555   st->print_cr("Registers:");

   556 #ifdef BUILTIN_SIM

   557   st->print(  "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);

   558   st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);

   559   st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);

   560   st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);

   561   st->cr();

   562   st->print(  "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);

   563   st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);

   564   st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);

   565   st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);

   566   st->cr();

   567   st->print(  "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);

   568   st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);

   569   st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);

   570   st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);

   571   st->cr();

   572   st->print(  "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);

   573   st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);

   574   st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);

   575   st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);

   576   st->cr();

   577   st->print(  "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);

   578   st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]);

   579   st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]);

   580   st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]);

   581   st->cr();

   582   st->print("  TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]);

   583   st->cr();

   584 #else

   585   for (int r = 0; r < 31; r++) {

   586     st->print("R%-2d=", r);

   587     print_location(st, uc->uc_mcontext.regs[r]);

   588   }

   589 #endif

   590   st->cr();

   591 

   592   intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);

   593   st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp));

   594   print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));

   595   st->cr();

   596 

   597   // Note: it may be unsafe to inspect memory near pc. For example, pc may

   598   // point to garbage if entry point in an nmethod is corrupted. Leave

   599   // this at the end, and hope for the best.

   600   address pc = os::Linux::ucontext_get_pc(uc);

   601   st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc));

   602   print_hex_dump(st, pc - 32, pc + 32, sizeof(char));

   603 }

   604 

   605 void os::print_register_info(outputStream *st, const void *context) {

   606   if (context == NULL) return;

   607 

   608   const ucontext_t *uc = (const ucontext_t*)context;

   609 

   610   st->print_cr("Register to memory mapping:");

   611   st->cr();

   612 

   613   // this is horrendously verbose but the layout of the registers in the

   614   // context does not match how we defined our abstract Register set, so

   615   // we can't just iterate through the gregs area

   616 

   617   // this is only for the "general purpose" registers

   618 

   619 #ifdef BUILTIN_SIM

   620   st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]);

   621   st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]);

   622   st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]);

   623   st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]);

   624   st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]);

   625   st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]);

   626   st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]);

   627   st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]);

   628   st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]);

   629   st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]);

   630   st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]);

   631   st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]);

   632   st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]);

   633   st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]);

   634   st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]);

   635   st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]);

   636 #else

   637   for (int r = 0; r < 31; r++)

   638     st->print_cr(  "R%d=" INTPTR_FORMAT, r, (uintptr_t)uc->uc_mcontext.regs[r]);

   639 #endif

   640   st->cr();

   641 }

   642 

   643 void os::setup_fpu() {

   644 }

   645 

   646 #ifndef PRODUCT

   647 void os::verify_stack_alignment() {

   648   assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");

   649 }

   650 #endif

   651 

   652 int os::extra_bang_size_in_bytes() {

   653   // AArch64 does not require the additional stack bang.

   654   return 0;

   655 }

   656 

   657 extern "C" {

   658   int SpinPause() {

   659     return 0;

   660   }

   661 

   662   void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {

   663     if (from > to) {

   664       jshort *end = from + count;

   665       while (from < end)

   666         *(to++) = *(from++);

   667     }

   668     else if (from < to) {

   669       jshort *end = from;

   670       from += count - 1;

   671       to   += count - 1;

   672       while (from >= end)

   673         *(to--) = *(from--);

   674     }

   675   }

   676   void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) {

   677     if (from > to) {

   678       jint *end = from + count;

   679       while (from < end)

   680         *(to++) = *(from++);

   681     }

   682     else if (from < to) {

   683       jint *end = from;

   684       from += count - 1;

   685       to   += count - 1;

   686       while (from >= end)

   687         *(to--) = *(from--);

   688     }

   689   }

   690   void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {

   691     if (from > to) {

   692       jlong *end = from + count;

   693       while (from < end)

   694         os::atomic_copy64(from++, to++);

   695     }

   696     else if (from < to) {

   697       jlong *end = from;

   698       from += count - 1;

   699       to   += count - 1;

   700       while (from >= end)

   701         os::atomic_copy64(from--, to--);

   702     }

   703   }

   704 

   705   void _Copy_arrayof_conjoint_bytes(HeapWord* from,

   706                                     HeapWord* to,

   707                                     size_t    count) {

   708     memmove(to, from, count);

   709   }

   710   void _Copy_arrayof_conjoint_jshorts(HeapWord* from,

   711                                       HeapWord* to,

   712                                       size_t    count) {

   713     memmove(to, from, count * 2);

   714   }

   715   void _Copy_arrayof_conjoint_jints(HeapWord* from,

   716                                     HeapWord* to,

   717                                     size_t    count) {

   718     memmove(to, from, count * 4);

   719   }

   720   void _Copy_arrayof_conjoint_jlongs(HeapWord* from,

   721                                      HeapWord* to,

   722                                      size_t    count) {

   723     memmove(to, from, count * 8);

   724   }

   725 };