1 /*
   2  * Copyright (c) 1999, 2013, 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 "asm/macroAssembler.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/systemDictionary.hpp"
  29 #include "classfile/vmSymbols.hpp"
  30 #include "code/icBuffer.hpp"
  31 #include "code/vtableStubs.hpp"
  32 #include "interpreter/interpreter.hpp"
  33 #include "jvm_solaris.h"
  34 #include "memory/allocation.inline.hpp"
  35 #include "mutex_solaris.inline.hpp"
  36 #include "nativeInst_sparc.hpp"
  37 #include "os_share_solaris.hpp"
  38 #include "prims/jniFastGetField.hpp"
  39 #include "prims/jvm.h"
  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 
  56 # include <signal.h>        // needed first to avoid name collision for "std" with SC 5.0
  57 
  58 // put OS-includes here
  59 # include <sys/types.h>
  60 # include <sys/mman.h>
  61 # include <pthread.h>
  62 # include <errno.h>
  63 # include <dlfcn.h>
  64 # include <stdio.h>
  65 # include <unistd.h>
  66 # include <sys/resource.h>
  67 # include <thread.h>
  68 # include <sys/stat.h>
  69 # include <sys/time.h>
  70 # include <sys/filio.h>
  71 # include <sys/utsname.h>
  72 # include <sys/systeminfo.h>
  73 # include <sys/socket.h>
  74 # include <sys/lwp.h>
  75 # include <pwd.h>
  76 # include <poll.h>
  77 # include <sys/lwp.h>
  78 
  79 # define _STRUCTURED_PROC 1  //  this gets us the new structured proc interfaces of 5.6 & later
  80 # include <sys/procfs.h>     //  see comment in <sys/procfs.h>
  81 
  82 #define MAX_PATH (2 * K)
  83 
  84 // Minimum stack size for the VM.  It's easier to document a constant
  85 // but it's different for x86 and sparc because the page sizes are different.
  86 #ifdef _LP64
  87 size_t os::Solaris::min_stack_allowed = 128*K;
  88 #else
  89 size_t os::Solaris::min_stack_allowed = 96*K;
  90 #endif
  91 
  92 int os::Solaris::max_register_window_saves_before_flushing() {
  93   // We should detect this at run time. For now, filling
  94   // in with a constant.
  95   return 8;
  96 }
  97 
  98 static void handle_unflushed_register_windows(gwindows_t *win) {
  99   int restore_count = win->wbcnt;
 100   int i;
 101 
 102   for(i=0; i<restore_count; i++) {
 103     address sp = ((address)win->spbuf[i]) + STACK_BIAS;
 104     address reg_win = (address)&win->wbuf[i];
 105     memcpy(sp,reg_win,sizeof(struct rwindow));
 106   }
 107 }
 108 
 109 char* os::non_memory_address_word() {
 110   // Must never look like an address returned by reserve_memory,
 111   // even in its subfields (as defined by the CPU immediate fields,
 112   // if the CPU splits constants across multiple instructions).
 113   // On SPARC, 0 != %hi(any real address), because there is no
 114   // allocation in the first 1Kb of the virtual address space.
 115   return (char*) 0;
 116 }
 117 
 118 // Validate a ucontext retrieved from walking a uc_link of a ucontext.
 119 // There are issues with libthread giving out uc_links for different threads
 120 // on the same uc_link chain and bad or circular links.
 121 //
 122 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) {
 123   if (valid >= suspect ||
 124       valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags ||
 125       valid->uc_stack.ss_sp    != suspect->uc_stack.ss_sp    ||
 126       valid->uc_stack.ss_size  != suspect->uc_stack.ss_size) {
 127     DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");)
 128     return false;
 129   }
 130 
 131   if (thread->is_Java_thread()) {
 132     if (!valid_stack_address(thread, (address)suspect)) {
 133       DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");)
 134       return false;
 135     }
 136     address _sp   = (address)((intptr_t)suspect->uc_mcontext.gregs[REG_SP] + STACK_BIAS);
 137     if (!valid_stack_address(thread, _sp) ||
 138         !frame::is_valid_stack_pointer(((JavaThread*)thread)->base_of_stack_pointer(), (intptr_t*)_sp)) {
 139       DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");)
 140       return false;
 141     }
 142   }
 143   return true;
 144 }
 145 
 146 // We will only follow one level of uc_link since there are libthread
 147 // issues with ucontext linking and it is better to be safe and just
 148 // let caller retry later.
 149 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
 150   ucontext_t *uc) {
 151 
 152   ucontext_t *retuc = NULL;
 153 
 154   // Sometimes the topmost register windows are not properly flushed.
 155   // i.e., if the kernel would have needed to take a page fault
 156   if (uc != NULL && uc->uc_mcontext.gwins != NULL) {
 157     ::handle_unflushed_register_windows(uc->uc_mcontext.gwins);
 158   }
 159 
 160   if (uc != NULL) {
 161     if (uc->uc_link == NULL) {
 162       // cannot validate without uc_link so accept current ucontext
 163       retuc = uc;
 164     } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
 165       // first ucontext is valid so try the next one
 166       uc = uc->uc_link;
 167       if (uc->uc_link == NULL) {
 168         // cannot validate without uc_link so accept current ucontext
 169         retuc = uc;
 170       } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
 171         // the ucontext one level down is also valid so return it
 172         retuc = uc;
 173       }
 174     }
 175   }
 176   return retuc;
 177 }
 178 
 179 // Assumes ucontext is valid
 180 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) {
 181   address pc = (address)uc->uc_mcontext.gregs[REG_PC];
 182   // set npc to zero to avoid using it for safepoint, good for profiling only
 183   return ExtendedPC(pc);
 184 }
 185 
 186 // Assumes ucontext is valid
 187 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) {
 188   return (intptr_t*)((intptr_t)uc->uc_mcontext.gregs[REG_SP] + STACK_BIAS);
 189 }
 190 
 191 // Solaris X86 only
 192 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) {
 193   ShouldNotReachHere();
 194   return NULL;
 195 }
 196 
 197 address os::Solaris::ucontext_get_pc(ucontext_t *uc) {
 198   return (address) uc->uc_mcontext.gregs[REG_PC];
 199 }
 200 
 201 
 202 // For Forte Analyzer AsyncGetCallTrace profiling support - thread
 203 // is currently interrupted by SIGPROF.
 204 //
 205 // ret_fp parameter is only used by Solaris X86.
 206 //
 207 // The difference between this and os::fetch_frame_from_context() is that
 208 // here we try to skip nested signal frames.
 209 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread,
 210   ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
 211 
 212   assert(thread != NULL, "just checking");
 213   assert(ret_sp != NULL, "just checking");
 214   assert(ret_fp == NULL, "just checking");
 215 
 216   ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc);
 217 
 218   return os::fetch_frame_from_context(luc, ret_sp, ret_fp);
 219 }
 220 
 221 
 222 // ret_fp parameter is only used by Solaris X86.
 223 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
 224                     intptr_t** ret_sp, intptr_t** ret_fp) {
 225 
 226   ExtendedPC  epc;
 227   ucontext_t *uc = (ucontext_t*)ucVoid;
 228 
 229   if (uc != NULL) {
 230     epc = os::Solaris::ucontext_get_ExtendedPC(uc);
 231     if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc);
 232   } else {
 233     // construct empty ExtendedPC for return value checking
 234     epc = ExtendedPC(NULL);
 235     if (ret_sp) *ret_sp = (intptr_t *)NULL;
 236   }
 237 
 238   return epc;
 239 }
 240 
 241 frame os::fetch_frame_from_context(void* ucVoid) {
 242   intptr_t* sp;
 243   intptr_t* fp;
 244   ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
 245   return frame(sp, frame::unpatchable, epc.pc());
 246 }
 247 
 248 frame os::get_sender_for_C_frame(frame* fr) {
 249   return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc());
 250 }
 251 
 252 // Returns an estimate of the current stack pointer. Result must be guaranteed to
 253 // point into the calling threads stack, and be no lower than the current stack
 254 // pointer.
 255 address os::current_stack_pointer() {
 256   volatile int dummy;
 257   address sp = (address)&dummy + 8;     // %%%% need to confirm if this is right
 258   return sp;
 259 }
 260 
 261 frame os::current_frame() {
 262   intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
 263   frame myframe(sp, frame::unpatchable,
 264                 CAST_FROM_FN_PTR(address, os::current_frame));
 265   if (os::is_first_C_frame(&myframe)) {
 266     // stack is not walkable
 267     return frame(NULL, NULL, false);
 268   } else {
 269     return os::get_sender_for_C_frame(&myframe);
 270   }
 271 }
 272 
 273 static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) {
 274   char lwpstatusfile[PROCFILE_LENGTH];
 275   int lwpfd, err;
 276 
 277   if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs))
 278     return (err);
 279   if (*flags == TRS_LWPID) {
 280     sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(),
 281             *lwp);
 282     if ((lwpfd = ::open(lwpstatusfile, O_RDONLY)) < 0) {
 283       perror("thr_mutator_status: open lwpstatus");
 284       return (EINVAL);
 285     }
 286     if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) !=
 287         sizeof (lwpstatus_t)) {
 288       perror("thr_mutator_status: read lwpstatus");
 289       (void) ::close(lwpfd);
 290       return (EINVAL);
 291     }
 292     (void) ::close(lwpfd);
 293   }
 294   return (0);
 295 }
 296 
 297 
 298 bool os::is_allocatable(size_t bytes) {
 299 #ifdef _LP64
 300    return true;
 301 #else
 302    return (bytes <= (size_t)3835*M);
 303 #endif
 304 }
 305 
 306 extern "C" JNIEXPORT int
 307 JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid,
 308                           int abort_if_unrecognized) {
 309   ucontext_t* uc = (ucontext_t*) ucVoid;
 310 
 311   Thread* t = ThreadLocalStorage::get_thread_slow();
 312 
 313   // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
 314   // (no destructors can be run)
 315   os::WatcherThreadCrashProtection::check_crash_protection(sig, t);
 316 
 317   SignalHandlerMark shm(t);
 318 
 319   if(sig == SIGPIPE || sig == SIGXFSZ) {
 320     if (os::Solaris::chained_handler(sig, info, ucVoid)) {
 321       return true;
 322     } else {
 323       if (PrintMiscellaneous && (WizardMode || Verbose)) {
 324         char buf[64];
 325         warning("Ignoring %s - see 4229104 or 6499219",
 326                 os::exception_name(sig, buf, sizeof(buf)));
 327 
 328       }
 329       return true;
 330     }
 331   }
 332 
 333   JavaThread* thread = NULL;
 334   VMThread* vmthread = NULL;
 335   if (os::Solaris::signal_handlers_are_installed) {
 336     if (t != NULL ){
 337       if(t->is_Java_thread()) {
 338         thread = (JavaThread*)t;
 339       }
 340       else if(t->is_VM_thread()){
 341         vmthread = (VMThread *)t;
 342       }
 343     }
 344   }
 345 
 346   guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs");
 347 
 348   if (sig == os::Solaris::SIGasync()) {
 349     if (thread || vmthread) {
 350       OSThread::SR_handler(t, uc);
 351       return true;
 352     } else if (os::Solaris::chained_handler(sig, info, ucVoid)) {
 353       return true;
 354     } else {
 355       // If os::Solaris::SIGasync not chained, and this is a non-vm and
 356       // non-java thread
 357       return true;
 358     }
 359   }
 360 
 361   if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
 362     // can't decode this kind of signal
 363     info = NULL;
 364   } else {
 365     assert(sig == info->si_signo, "bad siginfo");
 366   }
 367 
 368   // decide if this trap can be handled by a stub
 369   address stub = NULL;
 370 
 371   address pc          = NULL;
 372   address npc         = NULL;
 373 
 374   //%note os_trap_1
 375   if (info != NULL && uc != NULL && thread != NULL) {
 376     // factor me: getPCfromContext
 377     pc  = (address) uc->uc_mcontext.gregs[REG_PC];
 378     npc = (address) uc->uc_mcontext.gregs[REG_nPC];
 379 
 380     // SafeFetch() support
 381     if (StubRoutines::is_safefetch_fault(pc)) {
 382       uc->uc_mcontext.gregs[REG_PC] = intptr_t(StubRoutines::continuation_for_safefetch_fault(pc));
 383       uc->uc_mcontext.gregs[REG_nPC] = uc->uc_mcontext.gregs[REG_PC] + 4;
 384       return 1;
 385     }
 386 
 387     // Handle ALL stack overflow variations here
 388     if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) {
 389       address addr = (address) info->si_addr;
 390       if (thread->in_stack_yellow_zone(addr)) {
 391         thread->disable_stack_yellow_zone();
 392         // Sometimes the register windows are not properly flushed.
 393         if(uc->uc_mcontext.gwins != NULL) {
 394           ::handle_unflushed_register_windows(uc->uc_mcontext.gwins);
 395         }
 396         if (thread->thread_state() == _thread_in_Java) {
 397           // Throw a stack overflow exception.  Guard pages will be reenabled
 398           // while unwinding the stack.
 399           stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
 400         } else {
 401           // Thread was in the vm or native code.  Return and try to finish.
 402           return true;
 403         }
 404       } else if (thread->in_stack_red_zone(addr)) {
 405         // Fatal red zone violation.  Disable the guard pages and fall through
 406         // to handle_unexpected_exception way down below.
 407         thread->disable_stack_red_zone();
 408         tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
 409         // Sometimes the register windows are not properly flushed.
 410         if(uc->uc_mcontext.gwins != NULL) {
 411           ::handle_unflushed_register_windows(uc->uc_mcontext.gwins);
 412         }
 413       }
 414     }
 415 
 416 
 417     if (thread->thread_state() == _thread_in_vm) {
 418       if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) {
 419         stub = StubRoutines::handler_for_unsafe_access();
 420       }
 421     }
 422 
 423     else if (thread->thread_state() == _thread_in_Java) {
 424       // Java thread running in Java code => find exception handler if any
 425       // a fault inside compiled code, the interpreter, or a stub
 426 
 427       // Support Safepoint Polling
 428       if ( sig == SIGSEGV && (address)info->si_addr == os::get_polling_page() ) {
 429         stub = SharedRuntime::get_poll_stub(pc);
 430       }
 431 
 432       // Not needed on x86 solaris because verify_oops doesn't generate
 433       // SEGV/BUS like sparc does.
 434       if ( (sig == SIGSEGV || sig == SIGBUS)
 435            && pc >= MacroAssembler::_verify_oop_implicit_branch[0]
 436            && pc <  MacroAssembler::_verify_oop_implicit_branch[1] ) {
 437         stub     =  MacroAssembler::_verify_oop_implicit_branch[2];
 438         warning("fixed up memory fault in +VerifyOops at address " INTPTR_FORMAT, info->si_addr);
 439       }
 440 
 441       // This is not factored because on x86 solaris the patching for
 442       // zombies does not generate a SEGV.
 443       else if (sig == SIGSEGV && nativeInstruction_at(pc)->is_zombie()) {
 444         // zombie method (ld [%g0],%o7 instruction)
 445         stub = SharedRuntime::get_handle_wrong_method_stub();
 446 
 447         // At the stub it needs to look like a call from the caller of this
 448         // method (not a call from the segv site).
 449         pc = (address)uc->uc_mcontext.gregs[REG_O7];
 450       }
 451       else if (sig == SIGBUS && info->si_code == BUS_OBJERR) {
 452         // BugId 4454115: A read from a MappedByteBuffer can fault
 453         // here if the underlying file has been truncated.
 454         // Do not crash the VM in such a case.
 455         CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
 456         nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
 457         if (nm != NULL && nm->has_unsafe_access()) {
 458           stub = StubRoutines::handler_for_unsafe_access();
 459         }
 460       }
 461 
 462       else if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
 463         // integer divide by zero
 464         stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
 465       }
 466       else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) {
 467         // floating-point divide by zero
 468         stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
 469       }
 470 #ifdef COMPILER2
 471       else if (sig == SIGILL && nativeInstruction_at(pc)->is_ic_miss_trap()) {
 472 #ifdef ASSERT
 473   #ifdef TIERED
 474         CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
 475         assert(cb->is_compiled_by_c2(), "Wrong compiler");
 476   #endif // TIERED
 477 #endif // ASSERT
 478         // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken.
 479         stub = SharedRuntime::get_ic_miss_stub();
 480         // At the stub it needs to look like a call from the caller of this
 481         // method (not a call from the segv site).
 482         pc = (address)uc->uc_mcontext.gregs[REG_O7];
 483       }
 484 #endif  // COMPILER2
 485 
 486       else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
 487         // Determination of interpreter/vtable stub/compiled code null exception
 488         stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
 489       }
 490     }
 491 
 492     // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
 493     // and the heap gets shrunk before the field access.
 494     if ((sig == SIGSEGV) || (sig == SIGBUS)) {
 495       address addr = JNI_FastGetField::find_slowcase_pc(pc);
 496       if (addr != (address)-1) {
 497         stub = addr;
 498       }
 499     }
 500 
 501     // Check to see if we caught the safepoint code in the
 502     // process of write protecting the memory serialization page.
 503     // It write enables the page immediately after protecting it
 504     // so just return.
 505     if ((sig == SIGSEGV) &&
 506         os::is_memory_serialize_page(thread, (address)info->si_addr)) {
 507       // Block current thread until the memory serialize page permission restored.
 508       os::block_on_serialize_page_trap();
 509       return true;
 510     }
 511   }
 512 
 513   if (stub != NULL) {
 514     // save all thread context in case we need to restore it
 515 
 516     thread->set_saved_exception_pc(pc);
 517     thread->set_saved_exception_npc(npc);
 518 
 519     // simulate a branch to the stub (a "call" in the safepoint stub case)
 520     // factor me: setPC
 521     uc->uc_mcontext.gregs[REG_PC ] = (greg_t)stub;
 522     uc->uc_mcontext.gregs[REG_nPC] = (greg_t)(stub + 4);
 523 
 524 #ifndef PRODUCT
 525     if (TraceJumps) thread->record_jump(stub, NULL, __FILE__, __LINE__);
 526 #endif /* PRODUCT */
 527 
 528     return true;
 529   }
 530 
 531   // signal-chaining
 532   if (os::Solaris::chained_handler(sig, info, ucVoid)) {
 533     return true;
 534   }
 535 
 536   if (!abort_if_unrecognized) {
 537     // caller wants another chance, so give it to him
 538     return false;
 539   }
 540 
 541   if (!os::Solaris::libjsig_is_loaded) {
 542     struct sigaction oldAct;
 543     sigaction(sig, (struct sigaction *)0, &oldAct);
 544     if (oldAct.sa_sigaction != signalHandler) {
 545       void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
 546                                           : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
 547       warning("Unexpected Signal %d occurred under user-defined signal handler " INTPTR_FORMAT, sig, (intptr_t)sighand);
 548     }
 549   }
 550 
 551   if (pc == NULL && uc != NULL) {
 552     pc = (address) uc->uc_mcontext.gregs[REG_PC];
 553   }
 554 
 555   // Sometimes the register windows are not properly flushed.
 556   if(uc->uc_mcontext.gwins != NULL) {
 557     ::handle_unflushed_register_windows(uc->uc_mcontext.gwins);
 558   }
 559 
 560   // unmask current signal
 561   sigset_t newset;
 562   sigemptyset(&newset);
 563   sigaddset(&newset, sig);
 564   sigprocmask(SIG_UNBLOCK, &newset, NULL);
 565 
 566   // Determine which sort of error to throw.  Out of swap may signal
 567   // on the thread stack, which could get a mapping error when touched.
 568   address addr = (address) info->si_addr;
 569   if (sig == SIGBUS && info->si_code == BUS_OBJERR && info->si_errno == ENOMEM) {
 570     vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "Out of swap space to map in thread stack.");
 571   }
 572 
 573   VMError err(t, sig, pc, info, ucVoid);
 574   err.report_and_die();
 575 
 576   ShouldNotReachHere();
 577 }
 578 
 579 void os::print_context(outputStream *st, void *context) {
 580   if (context == NULL) return;
 581 
 582   ucontext_t *uc = (ucontext_t*)context;
 583   st->print_cr("Registers:");
 584 
 585   st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT
 586                " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT,
 587             uc->uc_mcontext.gregs[REG_G1],
 588             uc->uc_mcontext.gregs[REG_G2],
 589             uc->uc_mcontext.gregs[REG_G3],
 590             uc->uc_mcontext.gregs[REG_G4]);
 591   st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT
 592                " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT,
 593             uc->uc_mcontext.gregs[REG_G5],
 594             uc->uc_mcontext.gregs[REG_G6],
 595             uc->uc_mcontext.gregs[REG_G7],
 596             uc->uc_mcontext.gregs[REG_Y]);
 597   st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT
 598                " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT,
 599                  uc->uc_mcontext.gregs[REG_O0],
 600                  uc->uc_mcontext.gregs[REG_O1],
 601                  uc->uc_mcontext.gregs[REG_O2],
 602                  uc->uc_mcontext.gregs[REG_O3]);
 603   st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT
 604                " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT,
 605             uc->uc_mcontext.gregs[REG_O4],
 606             uc->uc_mcontext.gregs[REG_O5],
 607             uc->uc_mcontext.gregs[REG_O6],
 608             uc->uc_mcontext.gregs[REG_O7]);
 609 
 610 
 611   intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc);
 612   st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT
 613                " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT,
 614                sp[L0->sp_offset_in_saved_window()],
 615                sp[L1->sp_offset_in_saved_window()],
 616                sp[L2->sp_offset_in_saved_window()],
 617                sp[L3->sp_offset_in_saved_window()]);
 618   st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT
 619                " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT,
 620                sp[L4->sp_offset_in_saved_window()],
 621                sp[L5->sp_offset_in_saved_window()],
 622                sp[L6->sp_offset_in_saved_window()],
 623                sp[L7->sp_offset_in_saved_window()]);
 624   st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT
 625                " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT,
 626                sp[I0->sp_offset_in_saved_window()],
 627                sp[I1->sp_offset_in_saved_window()],
 628                sp[I2->sp_offset_in_saved_window()],
 629                sp[I3->sp_offset_in_saved_window()]);
 630   st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT
 631                " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT,
 632                sp[I4->sp_offset_in_saved_window()],
 633                sp[I5->sp_offset_in_saved_window()],
 634                sp[I6->sp_offset_in_saved_window()],
 635                sp[I7->sp_offset_in_saved_window()]);
 636 
 637   st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT,
 638             uc->uc_mcontext.gregs[REG_PC],
 639             uc->uc_mcontext.gregs[REG_nPC]);
 640   st->cr();
 641   st->cr();
 642 
 643   st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
 644   print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
 645   st->cr();
 646 
 647   // Note: it may be unsafe to inspect memory near pc. For example, pc may
 648   // point to garbage if entry point in an nmethod is corrupted. Leave
 649   // this at the end, and hope for the best.
 650   ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc);
 651   address pc = epc.pc();
 652   st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
 653   print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
 654 }
 655 
 656 void os::print_register_info(outputStream *st, void *context) {
 657   if (context == NULL) return;
 658 
 659   ucontext_t *uc = (ucontext_t*)context;
 660   intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc);
 661 
 662   st->print_cr("Register to memory mapping:");
 663   st->cr();
 664 
 665   // this is only for the "general purpose" registers
 666   st->print("G1="); print_location(st, uc->uc_mcontext.gregs[REG_G1]);
 667   st->print("G2="); print_location(st, uc->uc_mcontext.gregs[REG_G2]);
 668   st->print("G3="); print_location(st, uc->uc_mcontext.gregs[REG_G3]);
 669   st->print("G4="); print_location(st, uc->uc_mcontext.gregs[REG_G4]);
 670   st->print("G5="); print_location(st, uc->uc_mcontext.gregs[REG_G5]);
 671   st->print("G6="); print_location(st, uc->uc_mcontext.gregs[REG_G6]);
 672   st->print("G7="); print_location(st, uc->uc_mcontext.gregs[REG_G7]);
 673   st->cr();
 674 
 675   st->print("O0="); print_location(st, uc->uc_mcontext.gregs[REG_O0]);
 676   st->print("O1="); print_location(st, uc->uc_mcontext.gregs[REG_O1]);
 677   st->print("O2="); print_location(st, uc->uc_mcontext.gregs[REG_O2]);
 678   st->print("O3="); print_location(st, uc->uc_mcontext.gregs[REG_O3]);
 679   st->print("O4="); print_location(st, uc->uc_mcontext.gregs[REG_O4]);
 680   st->print("O5="); print_location(st, uc->uc_mcontext.gregs[REG_O5]);
 681   st->print("O6="); print_location(st, uc->uc_mcontext.gregs[REG_O6]);
 682   st->print("O7="); print_location(st, uc->uc_mcontext.gregs[REG_O7]);
 683   st->cr();
 684 
 685   st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]);
 686   st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]);
 687   st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]);
 688   st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]);
 689   st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]);
 690   st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]);
 691   st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]);
 692   st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]);
 693   st->cr();
 694 
 695   st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]);
 696   st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]);
 697   st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]);
 698   st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]);
 699   st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]);
 700   st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]);
 701   st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]);
 702   st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]);
 703   st->cr();
 704 }
 705 
 706 void os::Solaris::init_thread_fpu_state(void) {
 707     // Nothing needed on Sparc.
 708 }
 709 
 710 #if !defined(COMPILER2) && !defined(_LP64)
 711 
 712 // These routines are the initial value of atomic_xchg_entry(),
 713 // atomic_cmpxchg_entry(), atomic_add_entry() and fence_entry()
 714 // until initialization is complete.
 715 // TODO - remove when the VM drops support for V8.
 716 
 717 typedef jint  xchg_func_t        (jint,  volatile jint*);
 718 typedef jint  cmpxchg_func_t     (jint,  volatile jint*,  jint);
 719 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong);
 720 typedef jint  add_func_t         (jint,  volatile jint*);
 721 
 722 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
 723   // try to use the stub:
 724   xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
 725 
 726   if (func != NULL) {
 727     os::atomic_xchg_func = func;
 728     return (*func)(exchange_value, dest);
 729   }
 730   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 731 
 732   jint old_value = *dest;
 733   *dest = exchange_value;
 734   return old_value;
 735 }
 736 
 737 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
 738   // try to use the stub:
 739   cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
 740 
 741   if (func != NULL) {
 742     os::atomic_cmpxchg_func = func;
 743     return (*func)(exchange_value, dest, compare_value);
 744   }
 745   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 746 
 747   jint old_value = *dest;
 748   if (old_value == compare_value)
 749     *dest = exchange_value;
 750   return old_value;
 751 }
 752 
 753 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
 754   // try to use the stub:
 755   cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
 756 
 757   if (func != NULL) {
 758     os::atomic_cmpxchg_long_func = func;
 759     return (*func)(exchange_value, dest, compare_value);
 760   }
 761   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 762 
 763   jlong old_value = *dest;
 764   if (old_value == compare_value)
 765     *dest = exchange_value;
 766   return old_value;
 767 }
 768 
 769 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
 770   // try to use the stub:
 771   add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
 772 
 773   if (func != NULL) {
 774     os::atomic_add_func = func;
 775     return (*func)(add_value, dest);
 776   }
 777   assert(Threads::number_of_threads() == 0, "for bootstrap only");
 778 
 779   return (*dest) += add_value;
 780 }
 781 
 782 xchg_func_t*         os::atomic_xchg_func         = os::atomic_xchg_bootstrap;
 783 cmpxchg_func_t*      os::atomic_cmpxchg_func      = os::atomic_cmpxchg_bootstrap;
 784 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
 785 add_func_t*          os::atomic_add_func          = os::atomic_add_bootstrap;
 786 
 787 #endif // !_LP64 && !COMPILER2
 788 
 789 #if defined(__sparc) && defined(COMPILER2) && defined(_GNU_SOURCE)
 790  // See file build/solaris/makefiles/$compiler.make
 791  // For compiler1 the architecture is v8 and frps isn't present in v8
 792  extern "C"  void _mark_fpu_nosave() {
 793    __asm__ __volatile__ ("wr %%g0, 0, %%fprs \n\t" : : :);
 794   }
 795 #endif //defined(__sparc) && defined(COMPILER2)
 796 
 797 #ifndef PRODUCT
 798 void os::verify_stack_alignment() {
 799 }
 800 #endif