duke@435: /*
xdono@631:  * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // do not include  precompiled  header file
duke@435: # include "incls/_os_solaris_x86.cpp.incl"
duke@435: 
duke@435: // put OS-includes here
duke@435: # include <sys/types.h>
duke@435: # include <sys/mman.h>
duke@435: # include <pthread.h>
duke@435: # include <signal.h>
duke@435: # include <setjmp.h>
duke@435: # include <errno.h>
duke@435: # include <dlfcn.h>
duke@435: # include <stdio.h>
duke@435: # include <unistd.h>
duke@435: # include <sys/resource.h>
duke@435: # include <thread.h>
duke@435: # include <sys/stat.h>
duke@435: # include <sys/time.h>
duke@435: # include <sys/filio.h>
duke@435: # include <sys/utsname.h>
duke@435: # include <sys/systeminfo.h>
duke@435: # include <sys/socket.h>
duke@435: # include <sys/trap.h>
duke@435: # include <sys/lwp.h>
duke@435: # include <pwd.h>
duke@435: # include <poll.h>
duke@435: # include <sys/lwp.h>
duke@435: # include <procfs.h>     //  see comment in <sys/procfs.h>
duke@435: 
duke@435: #ifndef AMD64
duke@435: // QQQ seems useless at this point
duke@435: # define _STRUCTURED_PROC 1  //  this gets us the new structured proc interfaces of 5.6 & later
duke@435: #endif // AMD64
duke@435: # include <sys/procfs.h>     //  see comment in <sys/procfs.h>
duke@435: 
duke@435: 
duke@435: #define MAX_PATH (2 * K)
duke@435: 
duke@435: // Minimum stack size for the VM.  It's easier to document a constant value
duke@435: // but it's different for x86 and sparc because the page sizes are different.
duke@435: #ifdef AMD64
duke@435: size_t os::Solaris::min_stack_allowed = 224*K;
duke@435: #define REG_SP REG_RSP
duke@435: #define REG_PC REG_RIP
duke@435: #define REG_FP REG_RBP
duke@435: #else
duke@435: size_t os::Solaris::min_stack_allowed = 64*K;
duke@435: #define REG_SP UESP
duke@435: #define REG_PC EIP
duke@435: #define REG_FP EBP
duke@435: // 4900493 counter to prevent runaway LDTR refresh attempt
duke@435: 
duke@435: static volatile int ldtr_refresh = 0;
duke@435: // the libthread instruction that faults because of the stale LDTR
duke@435: 
duke@435: static const unsigned char movlfs[] = { 0x8e, 0xe0    // movl %eax,%fs
duke@435:                        };
duke@435: #endif // AMD64
duke@435: 
duke@435: char* os::non_memory_address_word() {
duke@435:   // Must never look like an address returned by reserve_memory,
duke@435:   // even in its subfields (as defined by the CPU immediate fields,
duke@435:   // if the CPU splits constants across multiple instructions).
duke@435:   return (char*) -1;
duke@435: }
duke@435: 
duke@435: //
duke@435: // Validate a ucontext retrieved from walking a uc_link of a ucontext.
duke@435: // There are issues with libthread giving out uc_links for different threads
duke@435: // on the same uc_link chain and bad or circular links.
duke@435: //
duke@435: bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) {
duke@435:   if (valid >= suspect ||
duke@435:       valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags ||
duke@435:       valid->uc_stack.ss_sp    != suspect->uc_stack.ss_sp    ||
duke@435:       valid->uc_stack.ss_size  != suspect->uc_stack.ss_size) {
duke@435:     DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");)
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   if (thread->is_Java_thread()) {
duke@435:     if (!valid_stack_address(thread, (address)suspect)) {
duke@435:       DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");)
duke@435:       return false;
duke@435:     }
duke@435:     if (!valid_stack_address(thread,  (address) suspect->uc_mcontext.gregs[REG_SP])) {
duke@435:       DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");)
duke@435:       return false;
duke@435:     }
duke@435:   }
duke@435:   return true;
duke@435: }
duke@435: 
duke@435: // We will only follow one level of uc_link since there are libthread
duke@435: // issues with ucontext linking and it is better to be safe and just
duke@435: // let caller retry later.
duke@435: ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
duke@435:   ucontext_t *uc) {
duke@435: 
duke@435:   ucontext_t *retuc = NULL;
duke@435: 
duke@435:   if (uc != NULL) {
duke@435:     if (uc->uc_link == NULL) {
duke@435:       // cannot validate without uc_link so accept current ucontext
duke@435:       retuc = uc;
duke@435:     } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
duke@435:       // first ucontext is valid so try the next one
duke@435:       uc = uc->uc_link;
duke@435:       if (uc->uc_link == NULL) {
duke@435:         // cannot validate without uc_link so accept current ucontext
duke@435:         retuc = uc;
duke@435:       } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
duke@435:         // the ucontext one level down is also valid so return it
duke@435:         retuc = uc;
duke@435:       }
duke@435:     }
duke@435:   }
duke@435:   return retuc;
duke@435: }
duke@435: 
duke@435: // Assumes ucontext is valid
duke@435: ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) {
duke@435:   return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]);
duke@435: }
duke@435: 
duke@435: // Assumes ucontext is valid
duke@435: intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) {
duke@435:   return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
duke@435: }
duke@435: 
duke@435: // Assumes ucontext is valid
duke@435: intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) {
duke@435:   return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
duke@435: }
duke@435: 
duke@435: // For Forte Analyzer AsyncGetCallTrace profiling support - thread
duke@435: // is currently interrupted by SIGPROF.
duke@435: //
duke@435: // The difference between this and os::fetch_frame_from_context() is that
duke@435: // here we try to skip nested signal frames.
duke@435: ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread,
duke@435:   ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
duke@435: 
duke@435:   assert(thread != NULL, "just checking");
duke@435:   assert(ret_sp != NULL, "just checking");
duke@435:   assert(ret_fp != NULL, "just checking");
duke@435: 
duke@435:   ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc);
duke@435:   return os::fetch_frame_from_context(luc, ret_sp, ret_fp);
duke@435: }
duke@435: 
duke@435: ExtendedPC os::fetch_frame_from_context(void* ucVoid,
duke@435:                     intptr_t** ret_sp, intptr_t** ret_fp) {
duke@435: 
duke@435:   ExtendedPC  epc;
duke@435:   ucontext_t *uc = (ucontext_t*)ucVoid;
duke@435: 
duke@435:   if (uc != NULL) {
duke@435:     epc = os::Solaris::ucontext_get_ExtendedPC(uc);
duke@435:     if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc);
duke@435:     if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc);
duke@435:   } else {
duke@435:     // construct empty ExtendedPC for return value checking
duke@435:     epc = ExtendedPC(NULL);
duke@435:     if (ret_sp) *ret_sp = (intptr_t *)NULL;
duke@435:     if (ret_fp) *ret_fp = (intptr_t *)NULL;
duke@435:   }
duke@435: 
duke@435:   return epc;
duke@435: }
duke@435: 
duke@435: frame os::fetch_frame_from_context(void* ucVoid) {
duke@435:   intptr_t* sp;
duke@435:   intptr_t* fp;
duke@435:   ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
duke@435:   return frame(sp, fp, epc.pc());
duke@435: }
duke@435: 
duke@435: frame os::get_sender_for_C_frame(frame* fr) {
duke@435:   return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
duke@435: }
duke@435: 
coleenp@907: extern "C" intptr_t *_get_current_fp();  // in .il file
duke@435: 
duke@435: frame os::current_frame() {
coleenp@907:   intptr_t* fp = _get_current_fp();  // it's inlined so want current fp
duke@435:   frame myframe((intptr_t*)os::current_stack_pointer(),
duke@435:                 (intptr_t*)fp,
duke@435:                 CAST_FROM_FN_PTR(address, os::current_frame));
duke@435:   if (os::is_first_C_frame(&myframe)) {
duke@435:     // stack is not walkable
sgoldman@542:     frame ret; // This will be a null useless frame
sgoldman@542:     return ret;
duke@435:   } else {
duke@435:     return os::get_sender_for_C_frame(&myframe);
duke@435:   }
duke@435: }
duke@435: 
duke@435: // This is a simple callback that just fetches a PC for an interrupted thread.
duke@435: // The thread need not be suspended and the fetched PC is just a hint.
duke@435: // This one is currently used for profiling the VMThread ONLY!
duke@435: 
duke@435: // Must be synchronous
duke@435: void GetThreadPC_Callback::execute(OSThread::InterruptArguments *args) {
duke@435:   Thread*     thread = args->thread();
duke@435:   ucontext_t* uc     = args->ucontext();
duke@435:   intptr_t* sp;
duke@435: 
duke@435:   assert(ProfileVM && thread->is_VM_thread(), "just checking");
duke@435: 
duke@435:   ExtendedPC new_addr((address)uc->uc_mcontext.gregs[REG_PC]);
duke@435:   _addr = new_addr;
duke@435: }
duke@435: 
duke@435: static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) {
duke@435:   char lwpstatusfile[PROCFILE_LENGTH];
duke@435:   int lwpfd, err;
duke@435: 
duke@435:   if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs))
duke@435:     return (err);
duke@435:   if (*flags == TRS_LWPID) {
duke@435:     sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(),
duke@435:             *lwp);
duke@435:     if ((lwpfd = open(lwpstatusfile, O_RDONLY)) < 0) {
duke@435:       perror("thr_mutator_status: open lwpstatus");
duke@435:       return (EINVAL);
duke@435:     }
duke@435:     if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) !=
duke@435:         sizeof (lwpstatus_t)) {
duke@435:       perror("thr_mutator_status: read lwpstatus");
duke@435:       (void) close(lwpfd);
duke@435:       return (EINVAL);
duke@435:     }
duke@435:     (void) close(lwpfd);
duke@435:   }
duke@435:   return (0);
duke@435: }
duke@435: 
duke@435: #ifndef AMD64
duke@435: 
duke@435: // Detecting SSE support by OS
duke@435: // From solaris_i486.s
duke@435: extern "C" bool sse_check();
duke@435: extern "C" bool sse_unavailable();
duke@435: 
duke@435: enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED};
duke@435: static int sse_status = SSE_UNKNOWN;
duke@435: 
duke@435: 
duke@435: static void  check_for_sse_support() {
duke@435:   if (!VM_Version::supports_sse()) {
duke@435:     sse_status = SSE_NOT_SUPPORTED;
duke@435:     return;
duke@435:   }
duke@435:   // looking for _sse_hw in libc.so, if it does not exist or
duke@435:   // the value (int) is 0, OS has no support for SSE
duke@435:   int *sse_hwp;
duke@435:   void *h;
duke@435: 
duke@435:   if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) {
duke@435:     //open failed, presume no support for SSE
duke@435:     sse_status = SSE_NOT_SUPPORTED;
duke@435:     return;
duke@435:   }
duke@435:   if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) {
duke@435:     sse_status = SSE_NOT_SUPPORTED;
duke@435:   } else if (*sse_hwp == 0) {
duke@435:     sse_status = SSE_NOT_SUPPORTED;
duke@435:   }
duke@435:   dlclose(h);
duke@435: 
duke@435:   if (sse_status == SSE_UNKNOWN) {
duke@435:     bool (*try_sse)() = (bool (*)())sse_check;
duke@435:     sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED;
duke@435:   }
duke@435: 
duke@435: }
duke@435: 
duke@435: bool os::supports_sse() {
duke@435:   if (sse_status == SSE_UNKNOWN)
duke@435:     check_for_sse_support();
duke@435:   return sse_status == SSE_SUPPORTED;
duke@435: }
duke@435: 
duke@435: #endif // AMD64
duke@435: 
duke@435: bool os::is_allocatable(size_t bytes) {
duke@435: #ifdef AMD64
duke@435:   return true;
duke@435: #else
duke@435: 
duke@435:   if (bytes < 2 * G) {
duke@435:     return true;
duke@435:   }
duke@435: 
duke@435:   char* addr = reserve_memory(bytes, NULL);
duke@435: 
duke@435:   if (addr != NULL) {
duke@435:     release_memory(addr, bytes);
duke@435:   }
duke@435: 
duke@435:   return addr != NULL;
duke@435: #endif // AMD64
duke@435: 
duke@435: }
duke@435: 
duke@435: extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
duke@435: 
duke@435: extern "C" void Fetch32PFI () ;
duke@435: extern "C" void Fetch32Resume () ;
duke@435: #ifdef AMD64
duke@435: extern "C" void FetchNPFI () ;
duke@435: extern "C" void FetchNResume () ;
duke@435: #endif // AMD64
duke@435: 
duke@435: int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
duke@435:   ucontext_t* uc = (ucontext_t*) ucVoid;
duke@435: 
duke@435: #ifndef AMD64
duke@435:   if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) {
duke@435:     // the SSE instruction faulted. supports_sse() need return false.
duke@435:     uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable;
duke@435:     return true;
duke@435:   }
duke@435: #endif // !AMD64
duke@435: 
duke@435:   Thread* t = ThreadLocalStorage::get_thread_slow();  // slow & steady
duke@435: 
duke@435:   SignalHandlerMark shm(t);
duke@435: 
duke@435:   if(sig == SIGPIPE || sig == SIGXFSZ) {
duke@435:     if (os::Solaris::chained_handler(sig, info, ucVoid)) {
duke@435:       return true;
duke@435:     } else {
duke@435:       if (PrintMiscellaneous && (WizardMode || Verbose)) {
duke@435:         char buf[64];
duke@435:         warning("Ignoring %s - see 4229104 or 6499219",
duke@435:                 os::exception_name(sig, buf, sizeof(buf)));
duke@435: 
duke@435:       }
duke@435:       return true;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   JavaThread* thread = NULL;
duke@435:   VMThread* vmthread = NULL;
duke@435: 
duke@435:   if (os::Solaris::signal_handlers_are_installed) {
duke@435:     if (t != NULL ){
duke@435:       if(t->is_Java_thread()) {
duke@435:         thread = (JavaThread*)t;
duke@435:       }
duke@435:       else if(t->is_VM_thread()){
duke@435:         vmthread = (VMThread *)t;
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs");
duke@435: 
duke@435:   if (sig == os::Solaris::SIGasync()) {
duke@435:     if(thread){
duke@435:       OSThread::InterruptArguments args(thread, uc);
duke@435:       thread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
duke@435:       return true;
duke@435:     }
duke@435:     else if(vmthread){
duke@435:       OSThread::InterruptArguments args(vmthread, uc);
duke@435:       vmthread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
duke@435:       return true;
duke@435:     } else if (os::Solaris::chained_handler(sig, info, ucVoid)) {
duke@435:       return true;
duke@435:     } else {
duke@435:       // If os::Solaris::SIGasync not chained, and this is a non-vm and
duke@435:       // non-java thread
duke@435:       return true;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
duke@435:     // can't decode this kind of signal
duke@435:     info = NULL;
duke@435:   } else {
duke@435:     assert(sig == info->si_signo, "bad siginfo");
duke@435:   }
duke@435: 
duke@435:   // decide if this trap can be handled by a stub
duke@435:   address stub = NULL;
duke@435: 
duke@435:   address pc          = NULL;
duke@435: 
duke@435:   //%note os_trap_1
duke@435:   if (info != NULL && uc != NULL && thread != NULL) {
duke@435:     // factor me: getPCfromContext
duke@435:     pc = (address) uc->uc_mcontext.gregs[REG_PC];
duke@435: 
duke@435:     // SafeFetch32() support
duke@435:     if (pc == (address) Fetch32PFI) {
duke@435:       uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;
duke@435:       return true ;
duke@435:     }
duke@435: #ifdef AMD64
duke@435:     if (pc == (address) FetchNPFI) {
duke@435:        uc->uc_mcontext.gregs [REG_PC] = intptr_t(FetchNResume) ;
duke@435:        return true ;
duke@435:     }
duke@435: #endif // AMD64
duke@435: 
duke@435:     // Handle ALL stack overflow variations here
duke@435:     if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) {
duke@435:       address addr = (address) info->si_addr;
duke@435:       if (thread->in_stack_yellow_zone(addr)) {
duke@435:         thread->disable_stack_yellow_zone();
duke@435:         if (thread->thread_state() == _thread_in_Java) {
duke@435:           // Throw a stack overflow exception.  Guard pages will be reenabled
duke@435:           // while unwinding the stack.
duke@435:           stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
duke@435:         } else {
duke@435:           // Thread was in the vm or native code.  Return and try to finish.
duke@435:           return true;
duke@435:         }
duke@435:       } else if (thread->in_stack_red_zone(addr)) {
duke@435:         // Fatal red zone violation.  Disable the guard pages and fall through
duke@435:         // to handle_unexpected_exception way down below.
duke@435:         thread->disable_stack_red_zone();
duke@435:         tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
duke@435:       }
duke@435:     }
duke@435: 
duke@435:     if (thread->thread_state() == _thread_in_vm) {
duke@435:       if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) {
duke@435:         stub = StubRoutines::handler_for_unsafe_access();
duke@435:       }
duke@435:     }
duke@435: 
duke@435:     if (thread->thread_state() == _thread_in_Java) {
duke@435:       // Support Safepoint Polling
duke@435:       if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
duke@435:         stub = SharedRuntime::get_poll_stub(pc);
duke@435:       }
duke@435:       else if (sig == SIGBUS && info->si_code == BUS_OBJERR) {
duke@435:         // BugId 4454115: A read from a MappedByteBuffer can fault
duke@435:         // here if the underlying file has been truncated.
duke@435:         // Do not crash the VM in such a case.
duke@435:         CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
duke@435:         nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
duke@435:         if (nm != NULL && nm->has_unsafe_access()) {
duke@435:           stub = StubRoutines::handler_for_unsafe_access();
duke@435:         }
duke@435:       }
duke@435:       else
duke@435:       if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
duke@435:         // integer divide by zero
duke@435:         stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
duke@435:       }
duke@435: #ifndef AMD64
duke@435:       else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) {
duke@435:         // floating-point divide by zero
duke@435:         stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
duke@435:       }
duke@435:       else if (sig == SIGFPE && info->si_code == FPE_FLTINV) {
duke@435:         // The encoding of D2I in i486.ad can cause an exception prior
duke@435:         // to the fist instruction if there was an invalid operation
duke@435:         // pending. We want to dismiss that exception. From the win_32
duke@435:         // side it also seems that if it really was the fist causing
duke@435:         // the exception that we do the d2i by hand with different
duke@435:         // rounding. Seems kind of weird. QQQ TODO
duke@435:         // Note that we take the exception at the NEXT floating point instruction.
duke@435:         if (pc[0] == 0xDB) {
duke@435:             assert(pc[0] == 0xDB, "not a FIST opcode");
duke@435:             assert(pc[1] == 0x14, "not a FIST opcode");
duke@435:             assert(pc[2] == 0x24, "not a FIST opcode");
duke@435:             return true;
duke@435:         } else {
duke@435:             assert(pc[-3] == 0xDB, "not an flt invalid opcode");
duke@435:             assert(pc[-2] == 0x14, "not an flt invalid opcode");
duke@435:             assert(pc[-1] == 0x24, "not an flt invalid opcode");
duke@435:         }
duke@435:       }
duke@435:       else if (sig == SIGFPE ) {
duke@435:         tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code);
duke@435:       }
duke@435: #endif // !AMD64
duke@435: 
duke@435:         // QQQ It doesn't seem that we need to do this on x86 because we should be able
duke@435:         // to return properly from the handler without this extra stuff on the back side.
duke@435: 
duke@435:       else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
duke@435:         // Determination of interpreter/vtable stub/compiled code null exception
duke@435:         stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
duke@435:       }
duke@435:     }
duke@435: 
duke@435:     // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
duke@435:     // and the heap gets shrunk before the field access.
duke@435:     if ((sig == SIGSEGV) || (sig == SIGBUS)) {
duke@435:       address addr = JNI_FastGetField::find_slowcase_pc(pc);
duke@435:       if (addr != (address)-1) {
duke@435:         stub = addr;
duke@435:       }
duke@435:     }
duke@435: 
duke@435:     // Check to see if we caught the safepoint code in the
duke@435:     // process of write protecting the memory serialization page.
duke@435:     // It write enables the page immediately after protecting it
duke@435:     // so we can just return to retry the write.
duke@435:     if ((sig == SIGSEGV) &&
duke@435:         os::is_memory_serialize_page(thread, (address)info->si_addr)) {
duke@435:       // Block current thread until the memory serialize page permission restored.
duke@435:       os::block_on_serialize_page_trap();
duke@435:       return true;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   // Execution protection violation
duke@435:   //
duke@435:   // Preventative code for future versions of Solaris which may
duke@435:   // enable execution protection when running the 32-bit VM on AMD64.
duke@435:   //
duke@435:   // This should be kept as the last step in the triage.  We don't
duke@435:   // have a dedicated trap number for a no-execute fault, so be
duke@435:   // conservative and allow other handlers the first shot.
duke@435:   //
duke@435:   // Note: We don't test that info->si_code == SEGV_ACCERR here.
duke@435:   // this si_code is so generic that it is almost meaningless; and
duke@435:   // the si_code for this condition may change in the future.
duke@435:   // Furthermore, a false-positive should be harmless.
duke@435:   if (UnguardOnExecutionViolation > 0 &&
duke@435:       (sig == SIGSEGV || sig == SIGBUS) &&
duke@435:       uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) {  // page fault
duke@435:     int page_size = os::vm_page_size();
duke@435:     address addr = (address) info->si_addr;
duke@435:     address pc = (address) uc->uc_mcontext.gregs[REG_PC];
duke@435:     // Make sure the pc and the faulting address are sane.
duke@435:     //
duke@435:     // If an instruction spans a page boundary, and the page containing
duke@435:     // the beginning of the instruction is executable but the following
duke@435:     // page is not, the pc and the faulting address might be slightly
duke@435:     // different - we still want to unguard the 2nd page in this case.
duke@435:     //
duke@435:     // 15 bytes seems to be a (very) safe value for max instruction size.
duke@435:     bool pc_is_near_addr =
duke@435:       (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
duke@435:     bool instr_spans_page_boundary =
duke@435:       (align_size_down((intptr_t) pc ^ (intptr_t) addr,
duke@435:                        (intptr_t) page_size) > 0);
duke@435: 
duke@435:     if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
duke@435:       static volatile address last_addr =
duke@435:         (address) os::non_memory_address_word();
duke@435: 
duke@435:       // In conservative mode, don't unguard unless the address is in the VM
duke@435:       if (addr != last_addr &&
duke@435:           (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
duke@435: 
duke@435:         // Unguard and retry
duke@435:         address page_start =
duke@435:           (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
duke@435:         bool res = os::unguard_memory((char*) page_start, page_size);
duke@435: 
duke@435:         if (PrintMiscellaneous && Verbose) {
duke@435:           char buf[256];
duke@435:           jio_snprintf(buf, sizeof(buf), "Execution protection violation "
duke@435:                        "at " INTPTR_FORMAT
duke@435:                        ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr,
duke@435:                        page_start, (res ? "success" : "failed"), errno);
duke@435:           tty->print_raw_cr(buf);
duke@435:         }
duke@435:         stub = pc;
duke@435: 
duke@435:         // Set last_addr so if we fault again at the same address, we don't end
duke@435:         // up in an endless loop.
duke@435:         //
duke@435:         // There are two potential complications here.  Two threads trapping at
duke@435:         // the same address at the same time could cause one of the threads to
duke@435:         // think it already unguarded, and abort the VM.  Likely very rare.
duke@435:         //
duke@435:         // The other race involves two threads alternately trapping at
duke@435:         // different addresses and failing to unguard the page, resulting in
duke@435:         // an endless loop.  This condition is probably even more unlikely than
duke@435:         // the first.
duke@435:         //
duke@435:         // Although both cases could be avoided by using locks or thread local
duke@435:         // last_addr, these solutions are unnecessary complication: this
duke@435:         // handler is a best-effort safety net, not a complete solution.  It is
duke@435:         // disabled by default and should only be used as a workaround in case
duke@435:         // we missed any no-execute-unsafe VM code.
duke@435: 
duke@435:         last_addr = addr;
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   if (stub != NULL) {
duke@435:     // save all thread context in case we need to restore it
duke@435: 
duke@435:     if (thread != NULL) thread->set_saved_exception_pc(pc);
duke@435:     // 12/02/99: On Sparc it appears that the full context is also saved
duke@435:     // but as yet, no one looks at or restores that saved context
duke@435:     // factor me: setPC
duke@435:     uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub;
duke@435:     return true;
duke@435:   }
duke@435: 
duke@435:   // signal-chaining
duke@435:   if (os::Solaris::chained_handler(sig, info, ucVoid)) {
duke@435:     return true;
duke@435:   }
duke@435: 
duke@435: #ifndef AMD64
duke@435:   // Workaround (bug 4900493) for Solaris kernel bug 4966651.
duke@435:   // Handle an undefined selector caused by an attempt to assign
duke@435:   // fs in libthread getipriptr(). With the current libthread design every 512
duke@435:   // thread creations the LDT for a private thread data structure is extended
duke@435:   // and thre is a hazard that and another thread attempting a thread creation
duke@435:   // will use a stale LDTR that doesn't reflect the structure's growth,
duke@435:   // causing a GP fault.
duke@435:   // Enforce the probable limit of passes through here to guard against an
duke@435:   // infinite loop if some other move to fs caused the GP fault. Note that
duke@435:   // this loop counter is ultimately a heuristic as it is possible for
duke@435:   // more than one thread to generate this fault at a time in an MP system.
duke@435:   // In the case of the loop count being exceeded or if the poll fails
duke@435:   // just fall through to a fatal error.
duke@435:   // If there is some other source of T_GPFLT traps and the text at EIP is
duke@435:   // unreadable this code will loop infinitely until the stack is exausted.
duke@435:   // The key to diagnosis in this case is to look for the bottom signal handler
duke@435:   // frame.
duke@435: 
duke@435:   if(! IgnoreLibthreadGPFault) {
duke@435:     if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) {
duke@435:       const unsigned char *p =
duke@435:                         (unsigned const char *) uc->uc_mcontext.gregs[EIP];
duke@435: 
duke@435:       // Expected instruction?
duke@435: 
duke@435:       if(p[0] == movlfs[0] && p[1] == movlfs[1]) {
duke@435: 
duke@435:         Atomic::inc(&ldtr_refresh);
duke@435: 
duke@435:         // Infinite loop?
duke@435: 
duke@435:         if(ldtr_refresh < ((2 << 16) / PAGESIZE)) {
duke@435: 
duke@435:           // No, force scheduling to get a fresh view of the LDTR
duke@435: 
duke@435:           if(poll(NULL, 0, 10) == 0) {
duke@435: 
duke@435:             // Retry the move
duke@435: 
duke@435:             return false;
duke@435:           }
duke@435:         }
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: #endif // !AMD64
duke@435: 
duke@435:   if (!abort_if_unrecognized) {
duke@435:     // caller wants another chance, so give it to him
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   if (!os::Solaris::libjsig_is_loaded) {
duke@435:     struct sigaction oldAct;
duke@435:     sigaction(sig, (struct sigaction *)0, &oldAct);
duke@435:     if (oldAct.sa_sigaction != signalHandler) {
duke@435:       void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*,  oldAct.sa_sigaction)
duke@435:                                           : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
duke@435:       warning("Unexpected Signal %d occured under user-defined signal handler %#lx", sig, (long)sighand);
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   if (pc == NULL && uc != NULL) {
duke@435:     pc = (address) uc->uc_mcontext.gregs[REG_PC];
duke@435:   }
duke@435: 
duke@435:   // unmask current signal
duke@435:   sigset_t newset;
duke@435:   sigemptyset(&newset);
duke@435:   sigaddset(&newset, sig);
duke@435:   sigprocmask(SIG_UNBLOCK, &newset, NULL);
duke@435: 
duke@435:   VMError err(t, sig, pc, info, ucVoid);
duke@435:   err.report_and_die();
duke@435: 
duke@435:   ShouldNotReachHere();
duke@435: }
duke@435: 
duke@435: void os::print_context(outputStream *st, void *context) {
duke@435:   if (context == NULL) return;
duke@435: 
duke@435:   ucontext_t *uc = (ucontext_t*)context;
duke@435:   st->print_cr("Registers:");
duke@435: #ifdef AMD64
duke@435:   st->print(  "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
duke@435:   st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
duke@435:   st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
duke@435:   st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
duke@435:   st->cr();
duke@435:   st->print(  "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
duke@435:   st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
duke@435:   st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
duke@435:   st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
duke@435:   st->cr();
duke@435:   st->print(", R8=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
duke@435:   st->print(", R9=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
duke@435:   st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
duke@435:   st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
duke@435:   st->print(", R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
duke@435:   st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
duke@435:   st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
duke@435:   st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
duke@435:   st->cr();
duke@435:   st->print(  "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
duke@435:   st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]);
duke@435: #else
duke@435:   st->print(  "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]);
duke@435:   st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]);
duke@435:   st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]);
duke@435:   st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]);
duke@435:   st->cr();
duke@435:   st->print(  "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]);
duke@435:   st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]);
duke@435:   st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]);
duke@435:   st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]);
duke@435:   st->cr();
duke@435:   st->print(  "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]);
duke@435:   st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]);
duke@435: #endif // AMD64
duke@435:   st->cr();
duke@435:   st->cr();
duke@435: 
duke@435:   intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc);
duke@435:   st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
duke@435:   print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
duke@435:   st->cr();
duke@435: 
duke@435:   // Note: it may be unsafe to inspect memory near pc. For example, pc may
duke@435:   // point to garbage if entry point in an nmethod is corrupted. Leave
duke@435:   // this at the end, and hope for the best.
duke@435:   ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc);
duke@435:   address pc = epc.pc();
duke@435:   st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
duke@435:   print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
duke@435: }
duke@435: 
duke@435: #ifdef AMD64
duke@435: void os::Solaris::init_thread_fpu_state(void) {
duke@435:   // Nothing to do
duke@435: }
duke@435: #else
duke@435: // From solaris_i486.s
duke@435: extern "C" void fixcw();
duke@435: 
duke@435: void os::Solaris::init_thread_fpu_state(void) {
duke@435:   // Set fpu to 53 bit precision. This happens too early to use a stub.
duke@435:   fixcw();
duke@435: }
duke@435: 
duke@435: // These routines are the initial value of atomic_xchg_entry(),
duke@435: // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry()
duke@435: // until initialization is complete.
duke@435: // TODO - replace with .il implementation when compiler supports it.
duke@435: 
duke@435: typedef jint  xchg_func_t        (jint,  volatile jint*);
duke@435: typedef jint  cmpxchg_func_t     (jint,  volatile jint*,  jint);
duke@435: typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong);
duke@435: typedef jint  add_func_t         (jint,  volatile jint*);
duke@435: typedef void  fence_func_t       ();
duke@435: 
duke@435: jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
duke@435:   // try to use the stub:
duke@435:   xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
duke@435: 
duke@435:   if (func != NULL) {
duke@435:     os::atomic_xchg_func = func;
duke@435:     return (*func)(exchange_value, dest);
duke@435:   }
duke@435:   assert(Threads::number_of_threads() == 0, "for bootstrap only");
duke@435: 
duke@435:   jint old_value = *dest;
duke@435:   *dest = exchange_value;
duke@435:   return old_value;
duke@435: }
duke@435: 
duke@435: jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
duke@435:   // try to use the stub:
duke@435:   cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
duke@435: 
duke@435:   if (func != NULL) {
duke@435:     os::atomic_cmpxchg_func = func;
duke@435:     return (*func)(exchange_value, dest, compare_value);
duke@435:   }
duke@435:   assert(Threads::number_of_threads() == 0, "for bootstrap only");
duke@435: 
duke@435:   jint old_value = *dest;
duke@435:   if (old_value == compare_value)
duke@435:     *dest = exchange_value;
duke@435:   return old_value;
duke@435: }
duke@435: 
duke@435: jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
duke@435:   // try to use the stub:
duke@435:   cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
duke@435: 
duke@435:   if (func != NULL) {
duke@435:     os::atomic_cmpxchg_long_func = func;
duke@435:     return (*func)(exchange_value, dest, compare_value);
duke@435:   }
duke@435:   assert(Threads::number_of_threads() == 0, "for bootstrap only");
duke@435: 
duke@435:   jlong old_value = *dest;
duke@435:   if (old_value == compare_value)
duke@435:     *dest = exchange_value;
duke@435:   return old_value;
duke@435: }
duke@435: 
duke@435: jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
duke@435:   // try to use the stub:
duke@435:   add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
duke@435: 
duke@435:   if (func != NULL) {
duke@435:     os::atomic_add_func = func;
duke@435:     return (*func)(add_value, dest);
duke@435:   }
duke@435:   assert(Threads::number_of_threads() == 0, "for bootstrap only");
duke@435: 
duke@435:   return (*dest) += add_value;
duke@435: }
duke@435: 
duke@435: void os::fence_bootstrap() {
duke@435:   // try to use the stub:
duke@435:   fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry());
duke@435: 
duke@435:   if (func != NULL) {
duke@435:     os::fence_func = func;
duke@435:     (*func)();
duke@435:     return;
duke@435:   }
duke@435:   assert(Threads::number_of_threads() == 0, "for bootstrap only");
duke@435: 
duke@435:   // don't have to do anything for a single thread
duke@435: }
duke@435: 
duke@435: xchg_func_t*         os::atomic_xchg_func         = os::atomic_xchg_bootstrap;
duke@435: cmpxchg_func_t*      os::atomic_cmpxchg_func      = os::atomic_cmpxchg_bootstrap;
duke@435: cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
duke@435: add_func_t*          os::atomic_add_func          = os::atomic_add_bootstrap;
duke@435: fence_func_t*        os::fence_func               = os::fence_bootstrap;
duke@435: 
duke@435: extern "C" _solaris_raw_setup_fpu(address ptr);
duke@435: void os::setup_fpu() {
duke@435:   address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std();
duke@435:   _solaris_raw_setup_fpu(fpu_cntrl);
duke@435: }
duke@435: #endif // AMD64