1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os_cpu/solaris_x86/vm/os_solaris_x86.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,878 @@
1.4 +/*
1.5 + * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// do not include precompiled header file
1.29 +# include "incls/_os_solaris_x86.cpp.incl"
1.30 +
1.31 +// put OS-includes here
1.32 +# include <sys/types.h>
1.33 +# include <sys/mman.h>
1.34 +# include <pthread.h>
1.35 +# include <signal.h>
1.36 +# include <setjmp.h>
1.37 +# include <errno.h>
1.38 +# include <dlfcn.h>
1.39 +# include <stdio.h>
1.40 +# include <unistd.h>
1.41 +# include <sys/resource.h>
1.42 +# include <thread.h>
1.43 +# include <sys/stat.h>
1.44 +# include <sys/time.h>
1.45 +# include <sys/filio.h>
1.46 +# include <sys/utsname.h>
1.47 +# include <sys/systeminfo.h>
1.48 +# include <sys/socket.h>
1.49 +# include <sys/trap.h>
1.50 +# include <sys/lwp.h>
1.51 +# include <pwd.h>
1.52 +# include <poll.h>
1.53 +# include <sys/lwp.h>
1.54 +# include <procfs.h> // see comment in <sys/procfs.h>
1.55 +
1.56 +#ifndef AMD64
1.57 +// QQQ seems useless at this point
1.58 +# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
1.59 +#endif // AMD64
1.60 +# include <sys/procfs.h> // see comment in <sys/procfs.h>
1.61 +
1.62 +
1.63 +#define MAX_PATH (2 * K)
1.64 +
1.65 +// Minimum stack size for the VM. It's easier to document a constant value
1.66 +// but it's different for x86 and sparc because the page sizes are different.
1.67 +#ifdef AMD64
1.68 +size_t os::Solaris::min_stack_allowed = 224*K;
1.69 +#define REG_SP REG_RSP
1.70 +#define REG_PC REG_RIP
1.71 +#define REG_FP REG_RBP
1.72 +#else
1.73 +size_t os::Solaris::min_stack_allowed = 64*K;
1.74 +#define REG_SP UESP
1.75 +#define REG_PC EIP
1.76 +#define REG_FP EBP
1.77 +// 4900493 counter to prevent runaway LDTR refresh attempt
1.78 +
1.79 +static volatile int ldtr_refresh = 0;
1.80 +// the libthread instruction that faults because of the stale LDTR
1.81 +
1.82 +static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs
1.83 + };
1.84 +#endif // AMD64
1.85 +
1.86 +char* os::non_memory_address_word() {
1.87 + // Must never look like an address returned by reserve_memory,
1.88 + // even in its subfields (as defined by the CPU immediate fields,
1.89 + // if the CPU splits constants across multiple instructions).
1.90 + return (char*) -1;
1.91 +}
1.92 +
1.93 +//
1.94 +// Validate a ucontext retrieved from walking a uc_link of a ucontext.
1.95 +// There are issues with libthread giving out uc_links for different threads
1.96 +// on the same uc_link chain and bad or circular links.
1.97 +//
1.98 +bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) {
1.99 + if (valid >= suspect ||
1.100 + valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags ||
1.101 + valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp ||
1.102 + valid->uc_stack.ss_size != suspect->uc_stack.ss_size) {
1.103 + DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");)
1.104 + return false;
1.105 + }
1.106 +
1.107 + if (thread->is_Java_thread()) {
1.108 + if (!valid_stack_address(thread, (address)suspect)) {
1.109 + DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");)
1.110 + return false;
1.111 + }
1.112 + if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) {
1.113 + DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");)
1.114 + return false;
1.115 + }
1.116 + }
1.117 + return true;
1.118 +}
1.119 +
1.120 +// We will only follow one level of uc_link since there are libthread
1.121 +// issues with ucontext linking and it is better to be safe and just
1.122 +// let caller retry later.
1.123 +ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
1.124 + ucontext_t *uc) {
1.125 +
1.126 + ucontext_t *retuc = NULL;
1.127 +
1.128 + if (uc != NULL) {
1.129 + if (uc->uc_link == NULL) {
1.130 + // cannot validate without uc_link so accept current ucontext
1.131 + retuc = uc;
1.132 + } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
1.133 + // first ucontext is valid so try the next one
1.134 + uc = uc->uc_link;
1.135 + if (uc->uc_link == NULL) {
1.136 + // cannot validate without uc_link so accept current ucontext
1.137 + retuc = uc;
1.138 + } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
1.139 + // the ucontext one level down is also valid so return it
1.140 + retuc = uc;
1.141 + }
1.142 + }
1.143 + }
1.144 + return retuc;
1.145 +}
1.146 +
1.147 +// Assumes ucontext is valid
1.148 +ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) {
1.149 + return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]);
1.150 +}
1.151 +
1.152 +// Assumes ucontext is valid
1.153 +intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) {
1.154 + return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
1.155 +}
1.156 +
1.157 +// Assumes ucontext is valid
1.158 +intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) {
1.159 + return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
1.160 +}
1.161 +
1.162 +// For Forte Analyzer AsyncGetCallTrace profiling support - thread
1.163 +// is currently interrupted by SIGPROF.
1.164 +//
1.165 +// The difference between this and os::fetch_frame_from_context() is that
1.166 +// here we try to skip nested signal frames.
1.167 +ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread,
1.168 + ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
1.169 +
1.170 + assert(thread != NULL, "just checking");
1.171 + assert(ret_sp != NULL, "just checking");
1.172 + assert(ret_fp != NULL, "just checking");
1.173 +
1.174 + ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc);
1.175 + return os::fetch_frame_from_context(luc, ret_sp, ret_fp);
1.176 +}
1.177 +
1.178 +ExtendedPC os::fetch_frame_from_context(void* ucVoid,
1.179 + intptr_t** ret_sp, intptr_t** ret_fp) {
1.180 +
1.181 + ExtendedPC epc;
1.182 + ucontext_t *uc = (ucontext_t*)ucVoid;
1.183 +
1.184 + if (uc != NULL) {
1.185 + epc = os::Solaris::ucontext_get_ExtendedPC(uc);
1.186 + if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc);
1.187 + if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc);
1.188 + } else {
1.189 + // construct empty ExtendedPC for return value checking
1.190 + epc = ExtendedPC(NULL);
1.191 + if (ret_sp) *ret_sp = (intptr_t *)NULL;
1.192 + if (ret_fp) *ret_fp = (intptr_t *)NULL;
1.193 + }
1.194 +
1.195 + return epc;
1.196 +}
1.197 +
1.198 +frame os::fetch_frame_from_context(void* ucVoid) {
1.199 + intptr_t* sp;
1.200 + intptr_t* fp;
1.201 + ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
1.202 + return frame(sp, fp, epc.pc());
1.203 +}
1.204 +
1.205 +frame os::get_sender_for_C_frame(frame* fr) {
1.206 + return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
1.207 +}
1.208 +
1.209 +extern "C" intptr_t *_get_previous_fp(); // in .il file.
1.210 +
1.211 +frame os::current_frame() {
1.212 + intptr_t* fp = _get_previous_fp();
1.213 + frame myframe((intptr_t*)os::current_stack_pointer(),
1.214 + (intptr_t*)fp,
1.215 + CAST_FROM_FN_PTR(address, os::current_frame));
1.216 + if (os::is_first_C_frame(&myframe)) {
1.217 + // stack is not walkable
1.218 + return frame(NULL, NULL, NULL);
1.219 + } else {
1.220 + return os::get_sender_for_C_frame(&myframe);
1.221 + }
1.222 +}
1.223 +
1.224 +// This is a simple callback that just fetches a PC for an interrupted thread.
1.225 +// The thread need not be suspended and the fetched PC is just a hint.
1.226 +// This one is currently used for profiling the VMThread ONLY!
1.227 +
1.228 +// Must be synchronous
1.229 +void GetThreadPC_Callback::execute(OSThread::InterruptArguments *args) {
1.230 + Thread* thread = args->thread();
1.231 + ucontext_t* uc = args->ucontext();
1.232 + intptr_t* sp;
1.233 +
1.234 + assert(ProfileVM && thread->is_VM_thread(), "just checking");
1.235 +
1.236 + ExtendedPC new_addr((address)uc->uc_mcontext.gregs[REG_PC]);
1.237 + _addr = new_addr;
1.238 +}
1.239 +
1.240 +static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) {
1.241 + char lwpstatusfile[PROCFILE_LENGTH];
1.242 + int lwpfd, err;
1.243 +
1.244 + if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs))
1.245 + return (err);
1.246 + if (*flags == TRS_LWPID) {
1.247 + sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(),
1.248 + *lwp);
1.249 + if ((lwpfd = open(lwpstatusfile, O_RDONLY)) < 0) {
1.250 + perror("thr_mutator_status: open lwpstatus");
1.251 + return (EINVAL);
1.252 + }
1.253 + if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) !=
1.254 + sizeof (lwpstatus_t)) {
1.255 + perror("thr_mutator_status: read lwpstatus");
1.256 + (void) close(lwpfd);
1.257 + return (EINVAL);
1.258 + }
1.259 + (void) close(lwpfd);
1.260 + }
1.261 + return (0);
1.262 +}
1.263 +
1.264 +#ifndef AMD64
1.265 +
1.266 +// Detecting SSE support by OS
1.267 +// From solaris_i486.s
1.268 +extern "C" bool sse_check();
1.269 +extern "C" bool sse_unavailable();
1.270 +
1.271 +enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED};
1.272 +static int sse_status = SSE_UNKNOWN;
1.273 +
1.274 +
1.275 +static void check_for_sse_support() {
1.276 + if (!VM_Version::supports_sse()) {
1.277 + sse_status = SSE_NOT_SUPPORTED;
1.278 + return;
1.279 + }
1.280 + // looking for _sse_hw in libc.so, if it does not exist or
1.281 + // the value (int) is 0, OS has no support for SSE
1.282 + int *sse_hwp;
1.283 + void *h;
1.284 +
1.285 + if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) {
1.286 + //open failed, presume no support for SSE
1.287 + sse_status = SSE_NOT_SUPPORTED;
1.288 + return;
1.289 + }
1.290 + if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) {
1.291 + sse_status = SSE_NOT_SUPPORTED;
1.292 + } else if (*sse_hwp == 0) {
1.293 + sse_status = SSE_NOT_SUPPORTED;
1.294 + }
1.295 + dlclose(h);
1.296 +
1.297 + if (sse_status == SSE_UNKNOWN) {
1.298 + bool (*try_sse)() = (bool (*)())sse_check;
1.299 + sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED;
1.300 + }
1.301 +
1.302 +}
1.303 +
1.304 +bool os::supports_sse() {
1.305 + if (sse_status == SSE_UNKNOWN)
1.306 + check_for_sse_support();
1.307 + return sse_status == SSE_SUPPORTED;
1.308 +}
1.309 +
1.310 +#endif // AMD64
1.311 +
1.312 +bool os::is_allocatable(size_t bytes) {
1.313 +#ifdef AMD64
1.314 + return true;
1.315 +#else
1.316 +
1.317 + if (bytes < 2 * G) {
1.318 + return true;
1.319 + }
1.320 +
1.321 + char* addr = reserve_memory(bytes, NULL);
1.322 +
1.323 + if (addr != NULL) {
1.324 + release_memory(addr, bytes);
1.325 + }
1.326 +
1.327 + return addr != NULL;
1.328 +#endif // AMD64
1.329 +
1.330 +}
1.331 +
1.332 +extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
1.333 +
1.334 +extern "C" void Fetch32PFI () ;
1.335 +extern "C" void Fetch32Resume () ;
1.336 +#ifdef AMD64
1.337 +extern "C" void FetchNPFI () ;
1.338 +extern "C" void FetchNResume () ;
1.339 +#endif // AMD64
1.340 +
1.341 +int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
1.342 + ucontext_t* uc = (ucontext_t*) ucVoid;
1.343 +
1.344 +#ifndef AMD64
1.345 + if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) {
1.346 + // the SSE instruction faulted. supports_sse() need return false.
1.347 + uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable;
1.348 + return true;
1.349 + }
1.350 +#endif // !AMD64
1.351 +
1.352 + Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
1.353 +
1.354 + SignalHandlerMark shm(t);
1.355 +
1.356 + if(sig == SIGPIPE || sig == SIGXFSZ) {
1.357 + if (os::Solaris::chained_handler(sig, info, ucVoid)) {
1.358 + return true;
1.359 + } else {
1.360 + if (PrintMiscellaneous && (WizardMode || Verbose)) {
1.361 + char buf[64];
1.362 + warning("Ignoring %s - see 4229104 or 6499219",
1.363 + os::exception_name(sig, buf, sizeof(buf)));
1.364 +
1.365 + }
1.366 + return true;
1.367 + }
1.368 + }
1.369 +
1.370 + JavaThread* thread = NULL;
1.371 + VMThread* vmthread = NULL;
1.372 +
1.373 + if (os::Solaris::signal_handlers_are_installed) {
1.374 + if (t != NULL ){
1.375 + if(t->is_Java_thread()) {
1.376 + thread = (JavaThread*)t;
1.377 + }
1.378 + else if(t->is_VM_thread()){
1.379 + vmthread = (VMThread *)t;
1.380 + }
1.381 + }
1.382 + }
1.383 +
1.384 + guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs");
1.385 +
1.386 + if (sig == os::Solaris::SIGasync()) {
1.387 + if(thread){
1.388 + OSThread::InterruptArguments args(thread, uc);
1.389 + thread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
1.390 + return true;
1.391 + }
1.392 + else if(vmthread){
1.393 + OSThread::InterruptArguments args(vmthread, uc);
1.394 + vmthread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
1.395 + return true;
1.396 + } else if (os::Solaris::chained_handler(sig, info, ucVoid)) {
1.397 + return true;
1.398 + } else {
1.399 + // If os::Solaris::SIGasync not chained, and this is a non-vm and
1.400 + // non-java thread
1.401 + return true;
1.402 + }
1.403 + }
1.404 +
1.405 + if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
1.406 + // can't decode this kind of signal
1.407 + info = NULL;
1.408 + } else {
1.409 + assert(sig == info->si_signo, "bad siginfo");
1.410 + }
1.411 +
1.412 + // decide if this trap can be handled by a stub
1.413 + address stub = NULL;
1.414 +
1.415 + address pc = NULL;
1.416 +
1.417 + //%note os_trap_1
1.418 + if (info != NULL && uc != NULL && thread != NULL) {
1.419 + // factor me: getPCfromContext
1.420 + pc = (address) uc->uc_mcontext.gregs[REG_PC];
1.421 +
1.422 + // SafeFetch32() support
1.423 + if (pc == (address) Fetch32PFI) {
1.424 + uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;
1.425 + return true ;
1.426 + }
1.427 +#ifdef AMD64
1.428 + if (pc == (address) FetchNPFI) {
1.429 + uc->uc_mcontext.gregs [REG_PC] = intptr_t(FetchNResume) ;
1.430 + return true ;
1.431 + }
1.432 +#endif // AMD64
1.433 +
1.434 + // Handle ALL stack overflow variations here
1.435 + if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) {
1.436 + address addr = (address) info->si_addr;
1.437 + if (thread->in_stack_yellow_zone(addr)) {
1.438 + thread->disable_stack_yellow_zone();
1.439 + if (thread->thread_state() == _thread_in_Java) {
1.440 + // Throw a stack overflow exception. Guard pages will be reenabled
1.441 + // while unwinding the stack.
1.442 + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
1.443 + } else {
1.444 + // Thread was in the vm or native code. Return and try to finish.
1.445 + return true;
1.446 + }
1.447 + } else if (thread->in_stack_red_zone(addr)) {
1.448 + // Fatal red zone violation. Disable the guard pages and fall through
1.449 + // to handle_unexpected_exception way down below.
1.450 + thread->disable_stack_red_zone();
1.451 + tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
1.452 + }
1.453 + }
1.454 +
1.455 + if (thread->thread_state() == _thread_in_vm) {
1.456 + if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) {
1.457 + stub = StubRoutines::handler_for_unsafe_access();
1.458 + }
1.459 + }
1.460 +
1.461 + if (thread->thread_state() == _thread_in_Java) {
1.462 + // Support Safepoint Polling
1.463 + if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
1.464 + stub = SharedRuntime::get_poll_stub(pc);
1.465 + }
1.466 + else if (sig == SIGBUS && info->si_code == BUS_OBJERR) {
1.467 + // BugId 4454115: A read from a MappedByteBuffer can fault
1.468 + // here if the underlying file has been truncated.
1.469 + // Do not crash the VM in such a case.
1.470 + CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
1.471 + nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
1.472 + if (nm != NULL && nm->has_unsafe_access()) {
1.473 + stub = StubRoutines::handler_for_unsafe_access();
1.474 + }
1.475 + }
1.476 + else
1.477 + if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
1.478 + // integer divide by zero
1.479 + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
1.480 + }
1.481 +#ifndef AMD64
1.482 + else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) {
1.483 + // floating-point divide by zero
1.484 + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
1.485 + }
1.486 + else if (sig == SIGFPE && info->si_code == FPE_FLTINV) {
1.487 + // The encoding of D2I in i486.ad can cause an exception prior
1.488 + // to the fist instruction if there was an invalid operation
1.489 + // pending. We want to dismiss that exception. From the win_32
1.490 + // side it also seems that if it really was the fist causing
1.491 + // the exception that we do the d2i by hand with different
1.492 + // rounding. Seems kind of weird. QQQ TODO
1.493 + // Note that we take the exception at the NEXT floating point instruction.
1.494 + if (pc[0] == 0xDB) {
1.495 + assert(pc[0] == 0xDB, "not a FIST opcode");
1.496 + assert(pc[1] == 0x14, "not a FIST opcode");
1.497 + assert(pc[2] == 0x24, "not a FIST opcode");
1.498 + return true;
1.499 + } else {
1.500 + assert(pc[-3] == 0xDB, "not an flt invalid opcode");
1.501 + assert(pc[-2] == 0x14, "not an flt invalid opcode");
1.502 + assert(pc[-1] == 0x24, "not an flt invalid opcode");
1.503 + }
1.504 + }
1.505 + else if (sig == SIGFPE ) {
1.506 + tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code);
1.507 + }
1.508 +#endif // !AMD64
1.509 +
1.510 + // QQQ It doesn't seem that we need to do this on x86 because we should be able
1.511 + // to return properly from the handler without this extra stuff on the back side.
1.512 +
1.513 + else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
1.514 + // Determination of interpreter/vtable stub/compiled code null exception
1.515 + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
1.516 + }
1.517 + }
1.518 +
1.519 + // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
1.520 + // and the heap gets shrunk before the field access.
1.521 + if ((sig == SIGSEGV) || (sig == SIGBUS)) {
1.522 + address addr = JNI_FastGetField::find_slowcase_pc(pc);
1.523 + if (addr != (address)-1) {
1.524 + stub = addr;
1.525 + }
1.526 + }
1.527 +
1.528 + // Check to see if we caught the safepoint code in the
1.529 + // process of write protecting the memory serialization page.
1.530 + // It write enables the page immediately after protecting it
1.531 + // so we can just return to retry the write.
1.532 + if ((sig == SIGSEGV) &&
1.533 + os::is_memory_serialize_page(thread, (address)info->si_addr)) {
1.534 + // Block current thread until the memory serialize page permission restored.
1.535 + os::block_on_serialize_page_trap();
1.536 + return true;
1.537 + }
1.538 + }
1.539 +
1.540 + // Execution protection violation
1.541 + //
1.542 + // Preventative code for future versions of Solaris which may
1.543 + // enable execution protection when running the 32-bit VM on AMD64.
1.544 + //
1.545 + // This should be kept as the last step in the triage. We don't
1.546 + // have a dedicated trap number for a no-execute fault, so be
1.547 + // conservative and allow other handlers the first shot.
1.548 + //
1.549 + // Note: We don't test that info->si_code == SEGV_ACCERR here.
1.550 + // this si_code is so generic that it is almost meaningless; and
1.551 + // the si_code for this condition may change in the future.
1.552 + // Furthermore, a false-positive should be harmless.
1.553 + if (UnguardOnExecutionViolation > 0 &&
1.554 + (sig == SIGSEGV || sig == SIGBUS) &&
1.555 + uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault
1.556 + int page_size = os::vm_page_size();
1.557 + address addr = (address) info->si_addr;
1.558 + address pc = (address) uc->uc_mcontext.gregs[REG_PC];
1.559 + // Make sure the pc and the faulting address are sane.
1.560 + //
1.561 + // If an instruction spans a page boundary, and the page containing
1.562 + // the beginning of the instruction is executable but the following
1.563 + // page is not, the pc and the faulting address might be slightly
1.564 + // different - we still want to unguard the 2nd page in this case.
1.565 + //
1.566 + // 15 bytes seems to be a (very) safe value for max instruction size.
1.567 + bool pc_is_near_addr =
1.568 + (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
1.569 + bool instr_spans_page_boundary =
1.570 + (align_size_down((intptr_t) pc ^ (intptr_t) addr,
1.571 + (intptr_t) page_size) > 0);
1.572 +
1.573 + if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
1.574 + static volatile address last_addr =
1.575 + (address) os::non_memory_address_word();
1.576 +
1.577 + // In conservative mode, don't unguard unless the address is in the VM
1.578 + if (addr != last_addr &&
1.579 + (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
1.580 +
1.581 + // Unguard and retry
1.582 + address page_start =
1.583 + (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
1.584 + bool res = os::unguard_memory((char*) page_start, page_size);
1.585 +
1.586 + if (PrintMiscellaneous && Verbose) {
1.587 + char buf[256];
1.588 + jio_snprintf(buf, sizeof(buf), "Execution protection violation "
1.589 + "at " INTPTR_FORMAT
1.590 + ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr,
1.591 + page_start, (res ? "success" : "failed"), errno);
1.592 + tty->print_raw_cr(buf);
1.593 + }
1.594 + stub = pc;
1.595 +
1.596 + // Set last_addr so if we fault again at the same address, we don't end
1.597 + // up in an endless loop.
1.598 + //
1.599 + // There are two potential complications here. Two threads trapping at
1.600 + // the same address at the same time could cause one of the threads to
1.601 + // think it already unguarded, and abort the VM. Likely very rare.
1.602 + //
1.603 + // The other race involves two threads alternately trapping at
1.604 + // different addresses and failing to unguard the page, resulting in
1.605 + // an endless loop. This condition is probably even more unlikely than
1.606 + // the first.
1.607 + //
1.608 + // Although both cases could be avoided by using locks or thread local
1.609 + // last_addr, these solutions are unnecessary complication: this
1.610 + // handler is a best-effort safety net, not a complete solution. It is
1.611 + // disabled by default and should only be used as a workaround in case
1.612 + // we missed any no-execute-unsafe VM code.
1.613 +
1.614 + last_addr = addr;
1.615 + }
1.616 + }
1.617 + }
1.618 +
1.619 + if (stub != NULL) {
1.620 + // save all thread context in case we need to restore it
1.621 +
1.622 + if (thread != NULL) thread->set_saved_exception_pc(pc);
1.623 + // 12/02/99: On Sparc it appears that the full context is also saved
1.624 + // but as yet, no one looks at or restores that saved context
1.625 + // factor me: setPC
1.626 + uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub;
1.627 + return true;
1.628 + }
1.629 +
1.630 + // signal-chaining
1.631 + if (os::Solaris::chained_handler(sig, info, ucVoid)) {
1.632 + return true;
1.633 + }
1.634 +
1.635 +#ifndef AMD64
1.636 + // Workaround (bug 4900493) for Solaris kernel bug 4966651.
1.637 + // Handle an undefined selector caused by an attempt to assign
1.638 + // fs in libthread getipriptr(). With the current libthread design every 512
1.639 + // thread creations the LDT for a private thread data structure is extended
1.640 + // and thre is a hazard that and another thread attempting a thread creation
1.641 + // will use a stale LDTR that doesn't reflect the structure's growth,
1.642 + // causing a GP fault.
1.643 + // Enforce the probable limit of passes through here to guard against an
1.644 + // infinite loop if some other move to fs caused the GP fault. Note that
1.645 + // this loop counter is ultimately a heuristic as it is possible for
1.646 + // more than one thread to generate this fault at a time in an MP system.
1.647 + // In the case of the loop count being exceeded or if the poll fails
1.648 + // just fall through to a fatal error.
1.649 + // If there is some other source of T_GPFLT traps and the text at EIP is
1.650 + // unreadable this code will loop infinitely until the stack is exausted.
1.651 + // The key to diagnosis in this case is to look for the bottom signal handler
1.652 + // frame.
1.653 +
1.654 + if(! IgnoreLibthreadGPFault) {
1.655 + if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) {
1.656 + const unsigned char *p =
1.657 + (unsigned const char *) uc->uc_mcontext.gregs[EIP];
1.658 +
1.659 + // Expected instruction?
1.660 +
1.661 + if(p[0] == movlfs[0] && p[1] == movlfs[1]) {
1.662 +
1.663 + Atomic::inc(&ldtr_refresh);
1.664 +
1.665 + // Infinite loop?
1.666 +
1.667 + if(ldtr_refresh < ((2 << 16) / PAGESIZE)) {
1.668 +
1.669 + // No, force scheduling to get a fresh view of the LDTR
1.670 +
1.671 + if(poll(NULL, 0, 10) == 0) {
1.672 +
1.673 + // Retry the move
1.674 +
1.675 + return false;
1.676 + }
1.677 + }
1.678 + }
1.679 + }
1.680 + }
1.681 +#endif // !AMD64
1.682 +
1.683 + if (!abort_if_unrecognized) {
1.684 + // caller wants another chance, so give it to him
1.685 + return false;
1.686 + }
1.687 +
1.688 + if (!os::Solaris::libjsig_is_loaded) {
1.689 + struct sigaction oldAct;
1.690 + sigaction(sig, (struct sigaction *)0, &oldAct);
1.691 + if (oldAct.sa_sigaction != signalHandler) {
1.692 + void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
1.693 + : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
1.694 + warning("Unexpected Signal %d occured under user-defined signal handler %#lx", sig, (long)sighand);
1.695 + }
1.696 + }
1.697 +
1.698 + if (pc == NULL && uc != NULL) {
1.699 + pc = (address) uc->uc_mcontext.gregs[REG_PC];
1.700 + }
1.701 +
1.702 + // unmask current signal
1.703 + sigset_t newset;
1.704 + sigemptyset(&newset);
1.705 + sigaddset(&newset, sig);
1.706 + sigprocmask(SIG_UNBLOCK, &newset, NULL);
1.707 +
1.708 + VMError err(t, sig, pc, info, ucVoid);
1.709 + err.report_and_die();
1.710 +
1.711 + ShouldNotReachHere();
1.712 +}
1.713 +
1.714 +void os::print_context(outputStream *st, void *context) {
1.715 + if (context == NULL) return;
1.716 +
1.717 + ucontext_t *uc = (ucontext_t*)context;
1.718 + st->print_cr("Registers:");
1.719 +#ifdef AMD64
1.720 + st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
1.721 + st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
1.722 + st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
1.723 + st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
1.724 + st->cr();
1.725 + st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
1.726 + st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
1.727 + st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
1.728 + st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
1.729 + st->cr();
1.730 + st->print(", R8=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
1.731 + st->print(", R9=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
1.732 + st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
1.733 + st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
1.734 + st->print(", R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
1.735 + st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
1.736 + st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
1.737 + st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
1.738 + st->cr();
1.739 + st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
1.740 + st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]);
1.741 +#else
1.742 + st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]);
1.743 + st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]);
1.744 + st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]);
1.745 + st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]);
1.746 + st->cr();
1.747 + st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]);
1.748 + st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]);
1.749 + st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]);
1.750 + st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]);
1.751 + st->cr();
1.752 + st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]);
1.753 + st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]);
1.754 +#endif // AMD64
1.755 + st->cr();
1.756 + st->cr();
1.757 +
1.758 + intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc);
1.759 + st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
1.760 + print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
1.761 + st->cr();
1.762 +
1.763 + // Note: it may be unsafe to inspect memory near pc. For example, pc may
1.764 + // point to garbage if entry point in an nmethod is corrupted. Leave
1.765 + // this at the end, and hope for the best.
1.766 + ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc);
1.767 + address pc = epc.pc();
1.768 + st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
1.769 + print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
1.770 +}
1.771 +
1.772 +#ifdef AMD64
1.773 +void os::Solaris::init_thread_fpu_state(void) {
1.774 + // Nothing to do
1.775 +}
1.776 +#else
1.777 +// From solaris_i486.s
1.778 +extern "C" void fixcw();
1.779 +
1.780 +void os::Solaris::init_thread_fpu_state(void) {
1.781 + // Set fpu to 53 bit precision. This happens too early to use a stub.
1.782 + fixcw();
1.783 +}
1.784 +
1.785 +// These routines are the initial value of atomic_xchg_entry(),
1.786 +// atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry()
1.787 +// until initialization is complete.
1.788 +// TODO - replace with .il implementation when compiler supports it.
1.789 +
1.790 +typedef jint xchg_func_t (jint, volatile jint*);
1.791 +typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
1.792 +typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong);
1.793 +typedef jint add_func_t (jint, volatile jint*);
1.794 +typedef void fence_func_t ();
1.795 +
1.796 +jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
1.797 + // try to use the stub:
1.798 + xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
1.799 +
1.800 + if (func != NULL) {
1.801 + os::atomic_xchg_func = func;
1.802 + return (*func)(exchange_value, dest);
1.803 + }
1.804 + assert(Threads::number_of_threads() == 0, "for bootstrap only");
1.805 +
1.806 + jint old_value = *dest;
1.807 + *dest = exchange_value;
1.808 + return old_value;
1.809 +}
1.810 +
1.811 +jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
1.812 + // try to use the stub:
1.813 + cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
1.814 +
1.815 + if (func != NULL) {
1.816 + os::atomic_cmpxchg_func = func;
1.817 + return (*func)(exchange_value, dest, compare_value);
1.818 + }
1.819 + assert(Threads::number_of_threads() == 0, "for bootstrap only");
1.820 +
1.821 + jint old_value = *dest;
1.822 + if (old_value == compare_value)
1.823 + *dest = exchange_value;
1.824 + return old_value;
1.825 +}
1.826 +
1.827 +jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
1.828 + // try to use the stub:
1.829 + cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
1.830 +
1.831 + if (func != NULL) {
1.832 + os::atomic_cmpxchg_long_func = func;
1.833 + return (*func)(exchange_value, dest, compare_value);
1.834 + }
1.835 + assert(Threads::number_of_threads() == 0, "for bootstrap only");
1.836 +
1.837 + jlong old_value = *dest;
1.838 + if (old_value == compare_value)
1.839 + *dest = exchange_value;
1.840 + return old_value;
1.841 +}
1.842 +
1.843 +jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
1.844 + // try to use the stub:
1.845 + add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
1.846 +
1.847 + if (func != NULL) {
1.848 + os::atomic_add_func = func;
1.849 + return (*func)(add_value, dest);
1.850 + }
1.851 + assert(Threads::number_of_threads() == 0, "for bootstrap only");
1.852 +
1.853 + return (*dest) += add_value;
1.854 +}
1.855 +
1.856 +void os::fence_bootstrap() {
1.857 + // try to use the stub:
1.858 + fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry());
1.859 +
1.860 + if (func != NULL) {
1.861 + os::fence_func = func;
1.862 + (*func)();
1.863 + return;
1.864 + }
1.865 + assert(Threads::number_of_threads() == 0, "for bootstrap only");
1.866 +
1.867 + // don't have to do anything for a single thread
1.868 +}
1.869 +
1.870 +xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
1.871 +cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
1.872 +cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
1.873 +add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
1.874 +fence_func_t* os::fence_func = os::fence_bootstrap;
1.875 +
1.876 +extern "C" _solaris_raw_setup_fpu(address ptr);
1.877 +void os::setup_fpu() {
1.878 + address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std();
1.879 + _solaris_raw_setup_fpu(fpu_cntrl);
1.880 +}
1.881 +#endif // AMD64
