Mercurial > hg > truffle
annotate src/os_cpu/solaris_x86/vm/os_solaris_x86.cpp @ 1250:3f5b7efb9642
6920293: OptimizeStringConcat causing core dumps
Reviewed-by: kvn, twisti
| author | never |
|---|---|
| date | Fri, 05 Feb 2010 11:07:40 -0800 |
| parents | d0994e5bebce |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1250 | 2 * Copyright 1999-2010 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // do not include precompiled header file | |
| 26 # include "incls/_os_solaris_x86.cpp.incl" | |
| 27 | |
| 28 // put OS-includes here | |
| 29 # include <sys/types.h> | |
| 30 # include <sys/mman.h> | |
| 31 # include <pthread.h> | |
| 32 # include <signal.h> | |
| 33 # include <setjmp.h> | |
| 34 # include <errno.h> | |
| 35 # include <dlfcn.h> | |
| 36 # include <stdio.h> | |
| 37 # include <unistd.h> | |
| 38 # include <sys/resource.h> | |
| 39 # include <thread.h> | |
| 40 # include <sys/stat.h> | |
| 41 # include <sys/time.h> | |
| 42 # include <sys/filio.h> | |
| 43 # include <sys/utsname.h> | |
| 44 # include <sys/systeminfo.h> | |
| 45 # include <sys/socket.h> | |
| 46 # include <sys/trap.h> | |
| 47 # include <sys/lwp.h> | |
| 48 # include <pwd.h> | |
| 49 # include <poll.h> | |
| 50 # include <sys/lwp.h> | |
| 51 # include <procfs.h> // see comment in <sys/procfs.h> | |
| 52 | |
| 53 #ifndef AMD64 | |
| 54 // QQQ seems useless at this point | |
| 55 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later | |
| 56 #endif // AMD64 | |
| 57 # include <sys/procfs.h> // see comment in <sys/procfs.h> | |
| 58 | |
| 59 | |
| 60 #define MAX_PATH (2 * K) | |
| 61 | |
| 62 // Minimum stack size for the VM. It's easier to document a constant value | |
| 63 // but it's different for x86 and sparc because the page sizes are different. | |
| 64 #ifdef AMD64 | |
| 65 size_t os::Solaris::min_stack_allowed = 224*K; | |
| 66 #define REG_SP REG_RSP | |
| 67 #define REG_PC REG_RIP | |
| 68 #define REG_FP REG_RBP | |
| 69 #else | |
| 70 size_t os::Solaris::min_stack_allowed = 64*K; | |
| 71 #define REG_SP UESP | |
| 72 #define REG_PC EIP | |
| 73 #define REG_FP EBP | |
| 74 // 4900493 counter to prevent runaway LDTR refresh attempt | |
| 75 | |
| 76 static volatile int ldtr_refresh = 0; | |
| 77 // the libthread instruction that faults because of the stale LDTR | |
| 78 | |
| 79 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs | |
| 80 }; | |
| 81 #endif // AMD64 | |
| 82 | |
| 83 char* os::non_memory_address_word() { | |
| 84 // Must never look like an address returned by reserve_memory, | |
| 85 // even in its subfields (as defined by the CPU immediate fields, | |
| 86 // if the CPU splits constants across multiple instructions). | |
| 87 return (char*) -1; | |
| 88 } | |
| 89 | |
| 90 // | |
| 91 // Validate a ucontext retrieved from walking a uc_link of a ucontext. | |
| 92 // There are issues with libthread giving out uc_links for different threads | |
| 93 // on the same uc_link chain and bad or circular links. | |
| 94 // | |
| 95 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) { | |
| 96 if (valid >= suspect || | |
| 97 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags || | |
| 98 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp || | |
| 99 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) { | |
| 100 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");) | |
| 101 return false; | |
| 102 } | |
| 103 | |
| 104 if (thread->is_Java_thread()) { | |
| 105 if (!valid_stack_address(thread, (address)suspect)) { | |
| 106 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");) | |
| 107 return false; | |
| 108 } | |
| 109 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) { | |
| 110 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");) | |
| 111 return false; | |
| 112 } | |
| 113 } | |
| 114 return true; | |
| 115 } | |
| 116 | |
| 117 // We will only follow one level of uc_link since there are libthread | |
| 118 // issues with ucontext linking and it is better to be safe and just | |
| 119 // let caller retry later. | |
| 120 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread, | |
| 121 ucontext_t *uc) { | |
| 122 | |
| 123 ucontext_t *retuc = NULL; | |
| 124 | |
| 125 if (uc != NULL) { | |
| 126 if (uc->uc_link == NULL) { | |
| 127 // cannot validate without uc_link so accept current ucontext | |
| 128 retuc = uc; | |
| 129 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { | |
| 130 // first ucontext is valid so try the next one | |
| 131 uc = uc->uc_link; | |
| 132 if (uc->uc_link == NULL) { | |
| 133 // cannot validate without uc_link so accept current ucontext | |
| 134 retuc = uc; | |
| 135 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { | |
| 136 // the ucontext one level down is also valid so return it | |
| 137 retuc = uc; | |
| 138 } | |
| 139 } | |
| 140 } | |
| 141 return retuc; | |
| 142 } | |
| 143 | |
| 144 // Assumes ucontext is valid | |
| 145 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) { | |
| 146 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]); | |
| 147 } | |
| 148 | |
| 149 // Assumes ucontext is valid | |
| 150 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) { | |
| 151 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; | |
| 152 } | |
| 153 | |
| 154 // Assumes ucontext is valid | |
| 155 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) { | |
| 156 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; | |
| 157 } | |
| 158 | |
| 159 // For Forte Analyzer AsyncGetCallTrace profiling support - thread | |
| 160 // is currently interrupted by SIGPROF. | |
| 161 // | |
| 162 // The difference between this and os::fetch_frame_from_context() is that | |
| 163 // here we try to skip nested signal frames. | |
| 164 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread, | |
| 165 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { | |
| 166 | |
| 167 assert(thread != NULL, "just checking"); | |
| 168 assert(ret_sp != NULL, "just checking"); | |
| 169 assert(ret_fp != NULL, "just checking"); | |
| 170 | |
| 171 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc); | |
| 172 return os::fetch_frame_from_context(luc, ret_sp, ret_fp); | |
| 173 } | |
| 174 | |
| 175 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
| 176 intptr_t** ret_sp, intptr_t** ret_fp) { | |
| 177 | |
| 178 ExtendedPC epc; | |
| 179 ucontext_t *uc = (ucontext_t*)ucVoid; | |
| 180 | |
| 181 if (uc != NULL) { | |
| 182 epc = os::Solaris::ucontext_get_ExtendedPC(uc); | |
| 183 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc); | |
| 184 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc); | |
| 185 } else { | |
| 186 // construct empty ExtendedPC for return value checking | |
| 187 epc = ExtendedPC(NULL); | |
| 188 if (ret_sp) *ret_sp = (intptr_t *)NULL; | |
| 189 if (ret_fp) *ret_fp = (intptr_t *)NULL; | |
| 190 } | |
| 191 | |
| 192 return epc; | |
| 193 } | |
| 194 | |
| 195 frame os::fetch_frame_from_context(void* ucVoid) { | |
| 196 intptr_t* sp; | |
| 197 intptr_t* fp; | |
| 198 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
| 199 return frame(sp, fp, epc.pc()); | |
| 200 } | |
| 201 | |
| 202 frame os::get_sender_for_C_frame(frame* fr) { | |
| 203 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
| 204 } | |
| 205 | |
|
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206 extern "C" intptr_t *_get_current_fp(); // in .il file |
| 0 | 207 |
| 208 frame os::current_frame() { | |
|
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209 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp |
| 0 | 210 frame myframe((intptr_t*)os::current_stack_pointer(), |
| 211 (intptr_t*)fp, | |
| 212 CAST_FROM_FN_PTR(address, os::current_frame)); | |
| 213 if (os::is_first_C_frame(&myframe)) { | |
| 214 // stack is not walkable | |
|
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215 frame ret; // This will be a null useless frame |
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216 return ret; |
| 0 | 217 } else { |
| 218 return os::get_sender_for_C_frame(&myframe); | |
| 219 } | |
| 220 } | |
| 221 | |
| 222 // This is a simple callback that just fetches a PC for an interrupted thread. | |
| 223 // The thread need not be suspended and the fetched PC is just a hint. | |
| 224 // This one is currently used for profiling the VMThread ONLY! | |
| 225 | |
| 226 // Must be synchronous | |
| 227 void GetThreadPC_Callback::execute(OSThread::InterruptArguments *args) { | |
| 228 Thread* thread = args->thread(); | |
| 229 ucontext_t* uc = args->ucontext(); | |
| 230 intptr_t* sp; | |
| 231 | |
| 232 assert(ProfileVM && thread->is_VM_thread(), "just checking"); | |
| 233 | |
| 234 ExtendedPC new_addr((address)uc->uc_mcontext.gregs[REG_PC]); | |
| 235 _addr = new_addr; | |
| 236 } | |
| 237 | |
| 238 static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) { | |
| 239 char lwpstatusfile[PROCFILE_LENGTH]; | |
| 240 int lwpfd, err; | |
| 241 | |
| 242 if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs)) | |
| 243 return (err); | |
| 244 if (*flags == TRS_LWPID) { | |
| 245 sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(), | |
| 246 *lwp); | |
| 247 if ((lwpfd = open(lwpstatusfile, O_RDONLY)) < 0) { | |
| 248 perror("thr_mutator_status: open lwpstatus"); | |
| 249 return (EINVAL); | |
| 250 } | |
| 251 if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) != | |
| 252 sizeof (lwpstatus_t)) { | |
| 253 perror("thr_mutator_status: read lwpstatus"); | |
| 254 (void) close(lwpfd); | |
| 255 return (EINVAL); | |
| 256 } | |
| 257 (void) close(lwpfd); | |
| 258 } | |
| 259 return (0); | |
| 260 } | |
| 261 | |
| 262 #ifndef AMD64 | |
| 263 | |
| 264 // Detecting SSE support by OS | |
| 265 // From solaris_i486.s | |
| 266 extern "C" bool sse_check(); | |
| 267 extern "C" bool sse_unavailable(); | |
| 268 | |
| 269 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED}; | |
| 270 static int sse_status = SSE_UNKNOWN; | |
| 271 | |
| 272 | |
| 273 static void check_for_sse_support() { | |
| 274 if (!VM_Version::supports_sse()) { | |
| 275 sse_status = SSE_NOT_SUPPORTED; | |
| 276 return; | |
| 277 } | |
| 278 // looking for _sse_hw in libc.so, if it does not exist or | |
| 279 // the value (int) is 0, OS has no support for SSE | |
| 280 int *sse_hwp; | |
| 281 void *h; | |
| 282 | |
| 283 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) { | |
| 284 //open failed, presume no support for SSE | |
| 285 sse_status = SSE_NOT_SUPPORTED; | |
| 286 return; | |
| 287 } | |
| 288 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) { | |
| 289 sse_status = SSE_NOT_SUPPORTED; | |
| 290 } else if (*sse_hwp == 0) { | |
| 291 sse_status = SSE_NOT_SUPPORTED; | |
| 292 } | |
| 293 dlclose(h); | |
| 294 | |
| 295 if (sse_status == SSE_UNKNOWN) { | |
| 296 bool (*try_sse)() = (bool (*)())sse_check; | |
| 297 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED; | |
| 298 } | |
| 299 | |
| 300 } | |
| 301 | |
| 585 | 302 #endif // AMD64 |
| 303 | |
| 0 | 304 bool os::supports_sse() { |
| 585 | 305 #ifdef AMD64 |
| 306 return true; | |
| 307 #else | |
| 0 | 308 if (sse_status == SSE_UNKNOWN) |
| 309 check_for_sse_support(); | |
| 310 return sse_status == SSE_SUPPORTED; | |
| 585 | 311 #endif // AMD64 |
| 0 | 312 } |
| 313 | |
| 314 bool os::is_allocatable(size_t bytes) { | |
| 315 #ifdef AMD64 | |
| 316 return true; | |
| 317 #else | |
| 318 | |
| 319 if (bytes < 2 * G) { | |
| 320 return true; | |
| 321 } | |
| 322 | |
| 323 char* addr = reserve_memory(bytes, NULL); | |
| 324 | |
| 325 if (addr != NULL) { | |
| 326 release_memory(addr, bytes); | |
| 327 } | |
| 328 | |
| 329 return addr != NULL; | |
| 330 #endif // AMD64 | |
| 331 | |
| 332 } | |
| 333 | |
| 334 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); | |
| 335 | |
| 336 extern "C" void Fetch32PFI () ; | |
| 337 extern "C" void Fetch32Resume () ; | |
| 338 #ifdef AMD64 | |
| 339 extern "C" void FetchNPFI () ; | |
| 340 extern "C" void FetchNResume () ; | |
| 341 #endif // AMD64 | |
| 342 | |
| 343 int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) { | |
| 344 ucontext_t* uc = (ucontext_t*) ucVoid; | |
| 345 | |
| 346 #ifndef AMD64 | |
| 347 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) { | |
| 348 // the SSE instruction faulted. supports_sse() need return false. | |
| 349 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable; | |
| 350 return true; | |
| 351 } | |
| 352 #endif // !AMD64 | |
| 353 | |
| 354 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady | |
| 355 | |
| 356 SignalHandlerMark shm(t); | |
| 357 | |
| 358 if(sig == SIGPIPE || sig == SIGXFSZ) { | |
| 359 if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
| 360 return true; | |
| 361 } else { | |
| 362 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
| 363 char buf[64]; | |
| 364 warning("Ignoring %s - see 4229104 or 6499219", | |
| 365 os::exception_name(sig, buf, sizeof(buf))); | |
| 366 | |
| 367 } | |
| 368 return true; | |
| 369 } | |
| 370 } | |
| 371 | |
| 372 JavaThread* thread = NULL; | |
| 373 VMThread* vmthread = NULL; | |
| 374 | |
| 375 if (os::Solaris::signal_handlers_are_installed) { | |
| 376 if (t != NULL ){ | |
| 377 if(t->is_Java_thread()) { | |
| 378 thread = (JavaThread*)t; | |
| 379 } | |
| 380 else if(t->is_VM_thread()){ | |
| 381 vmthread = (VMThread *)t; | |
| 382 } | |
| 383 } | |
| 384 } | |
| 385 | |
| 386 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs"); | |
| 387 | |
| 388 if (sig == os::Solaris::SIGasync()) { | |
| 389 if(thread){ | |
| 390 OSThread::InterruptArguments args(thread, uc); | |
| 391 thread->osthread()->do_interrupt_callbacks_at_interrupt(&args); | |
| 392 return true; | |
| 393 } | |
| 394 else if(vmthread){ | |
| 395 OSThread::InterruptArguments args(vmthread, uc); | |
| 396 vmthread->osthread()->do_interrupt_callbacks_at_interrupt(&args); | |
| 397 return true; | |
| 398 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
| 399 return true; | |
| 400 } else { | |
| 401 // If os::Solaris::SIGasync not chained, and this is a non-vm and | |
| 402 // non-java thread | |
| 403 return true; | |
| 404 } | |
| 405 } | |
| 406 | |
| 407 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { | |
| 408 // can't decode this kind of signal | |
| 409 info = NULL; | |
| 410 } else { | |
| 411 assert(sig == info->si_signo, "bad siginfo"); | |
| 412 } | |
| 413 | |
| 414 // decide if this trap can be handled by a stub | |
| 415 address stub = NULL; | |
| 416 | |
| 417 address pc = NULL; | |
| 418 | |
| 419 //%note os_trap_1 | |
| 420 if (info != NULL && uc != NULL && thread != NULL) { | |
| 421 // factor me: getPCfromContext | |
| 422 pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
| 423 | |
| 424 // SafeFetch32() support | |
| 425 if (pc == (address) Fetch32PFI) { | |
| 426 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ; | |
| 427 return true ; | |
| 428 } | |
| 429 #ifdef AMD64 | |
| 430 if (pc == (address) FetchNPFI) { | |
| 431 uc->uc_mcontext.gregs [REG_PC] = intptr_t(FetchNResume) ; | |
| 432 return true ; | |
| 433 } | |
| 434 #endif // AMD64 | |
| 435 | |
| 436 // Handle ALL stack overflow variations here | |
| 437 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) { | |
| 438 address addr = (address) info->si_addr; | |
| 439 if (thread->in_stack_yellow_zone(addr)) { | |
| 440 thread->disable_stack_yellow_zone(); | |
| 441 if (thread->thread_state() == _thread_in_Java) { | |
| 442 // Throw a stack overflow exception. Guard pages will be reenabled | |
| 443 // while unwinding the stack. | |
| 444 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); | |
| 445 } else { | |
| 446 // Thread was in the vm or native code. Return and try to finish. | |
| 447 return true; | |
| 448 } | |
| 449 } else if (thread->in_stack_red_zone(addr)) { | |
| 450 // Fatal red zone violation. Disable the guard pages and fall through | |
| 451 // to handle_unexpected_exception way down below. | |
| 452 thread->disable_stack_red_zone(); | |
| 453 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
| 454 } | |
| 455 } | |
| 456 | |
| 457 if (thread->thread_state() == _thread_in_vm) { | |
| 458 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) { | |
| 459 stub = StubRoutines::handler_for_unsafe_access(); | |
| 460 } | |
| 461 } | |
| 462 | |
| 463 if (thread->thread_state() == _thread_in_Java) { | |
| 464 // Support Safepoint Polling | |
| 465 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { | |
| 466 stub = SharedRuntime::get_poll_stub(pc); | |
| 467 } | |
| 468 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) { | |
| 469 // BugId 4454115: A read from a MappedByteBuffer can fault | |
| 470 // here if the underlying file has been truncated. | |
| 471 // Do not crash the VM in such a case. | |
| 472 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
| 473 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
| 474 if (nm != NULL && nm->has_unsafe_access()) { | |
| 475 stub = StubRoutines::handler_for_unsafe_access(); | |
| 476 } | |
| 477 } | |
| 478 else | |
| 479 if (sig == SIGFPE && info->si_code == FPE_INTDIV) { | |
| 480 // integer divide by zero | |
| 481 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
| 482 } | |
| 483 #ifndef AMD64 | |
| 484 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) { | |
| 485 // floating-point divide by zero | |
| 486 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
| 487 } | |
| 488 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) { | |
| 489 // The encoding of D2I in i486.ad can cause an exception prior | |
| 490 // to the fist instruction if there was an invalid operation | |
| 491 // pending. We want to dismiss that exception. From the win_32 | |
| 492 // side it also seems that if it really was the fist causing | |
| 493 // the exception that we do the d2i by hand with different | |
| 494 // rounding. Seems kind of weird. QQQ TODO | |
| 495 // Note that we take the exception at the NEXT floating point instruction. | |
| 496 if (pc[0] == 0xDB) { | |
| 497 assert(pc[0] == 0xDB, "not a FIST opcode"); | |
| 498 assert(pc[1] == 0x14, "not a FIST opcode"); | |
| 499 assert(pc[2] == 0x24, "not a FIST opcode"); | |
| 500 return true; | |
| 501 } else { | |
| 502 assert(pc[-3] == 0xDB, "not an flt invalid opcode"); | |
| 503 assert(pc[-2] == 0x14, "not an flt invalid opcode"); | |
| 504 assert(pc[-1] == 0x24, "not an flt invalid opcode"); | |
| 505 } | |
| 506 } | |
| 507 else if (sig == SIGFPE ) { | |
| 508 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code); | |
| 509 } | |
| 510 #endif // !AMD64 | |
| 511 | |
| 512 // QQQ It doesn't seem that we need to do this on x86 because we should be able | |
| 513 // to return properly from the handler without this extra stuff on the back side. | |
| 514 | |
| 515 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { | |
| 516 // Determination of interpreter/vtable stub/compiled code null exception | |
| 517 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); | |
| 518 } | |
| 519 } | |
| 520 | |
| 521 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
| 522 // and the heap gets shrunk before the field access. | |
| 523 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
| 524 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
| 525 if (addr != (address)-1) { | |
| 526 stub = addr; | |
| 527 } | |
| 528 } | |
| 529 | |
| 530 // Check to see if we caught the safepoint code in the | |
| 531 // process of write protecting the memory serialization page. | |
| 532 // It write enables the page immediately after protecting it | |
| 533 // so we can just return to retry the write. | |
| 534 if ((sig == SIGSEGV) && | |
| 535 os::is_memory_serialize_page(thread, (address)info->si_addr)) { | |
| 536 // Block current thread until the memory serialize page permission restored. | |
| 537 os::block_on_serialize_page_trap(); | |
| 538 return true; | |
| 539 } | |
| 540 } | |
| 541 | |
| 542 // Execution protection violation | |
| 543 // | |
| 544 // Preventative code for future versions of Solaris which may | |
| 545 // enable execution protection when running the 32-bit VM on AMD64. | |
| 546 // | |
| 547 // This should be kept as the last step in the triage. We don't | |
| 548 // have a dedicated trap number for a no-execute fault, so be | |
| 549 // conservative and allow other handlers the first shot. | |
| 550 // | |
| 551 // Note: We don't test that info->si_code == SEGV_ACCERR here. | |
| 552 // this si_code is so generic that it is almost meaningless; and | |
| 553 // the si_code for this condition may change in the future. | |
| 554 // Furthermore, a false-positive should be harmless. | |
| 555 if (UnguardOnExecutionViolation > 0 && | |
| 556 (sig == SIGSEGV || sig == SIGBUS) && | |
| 557 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault | |
| 558 int page_size = os::vm_page_size(); | |
| 559 address addr = (address) info->si_addr; | |
| 560 address pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
| 561 // Make sure the pc and the faulting address are sane. | |
| 562 // | |
| 563 // If an instruction spans a page boundary, and the page containing | |
| 564 // the beginning of the instruction is executable but the following | |
| 565 // page is not, the pc and the faulting address might be slightly | |
| 566 // different - we still want to unguard the 2nd page in this case. | |
| 567 // | |
| 568 // 15 bytes seems to be a (very) safe value for max instruction size. | |
| 569 bool pc_is_near_addr = | |
| 570 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); | |
| 571 bool instr_spans_page_boundary = | |
| 572 (align_size_down((intptr_t) pc ^ (intptr_t) addr, | |
| 573 (intptr_t) page_size) > 0); | |
| 574 | |
| 575 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { | |
| 576 static volatile address last_addr = | |
| 577 (address) os::non_memory_address_word(); | |
| 578 | |
| 579 // In conservative mode, don't unguard unless the address is in the VM | |
| 580 if (addr != last_addr && | |
| 581 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { | |
| 582 | |
|
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583 // Make memory rwx and retry |
| 0 | 584 address page_start = |
| 585 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); | |
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586 bool res = os::protect_memory((char*) page_start, page_size, |
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587 os::MEM_PROT_RWX); |
| 0 | 588 |
| 589 if (PrintMiscellaneous && Verbose) { | |
| 590 char buf[256]; | |
| 591 jio_snprintf(buf, sizeof(buf), "Execution protection violation " | |
| 592 "at " INTPTR_FORMAT | |
| 593 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, | |
| 594 page_start, (res ? "success" : "failed"), errno); | |
| 595 tty->print_raw_cr(buf); | |
| 596 } | |
| 597 stub = pc; | |
| 598 | |
| 599 // Set last_addr so if we fault again at the same address, we don't end | |
| 600 // up in an endless loop. | |
| 601 // | |
| 602 // There are two potential complications here. Two threads trapping at | |
| 603 // the same address at the same time could cause one of the threads to | |
| 604 // think it already unguarded, and abort the VM. Likely very rare. | |
| 605 // | |
| 606 // The other race involves two threads alternately trapping at | |
| 607 // different addresses and failing to unguard the page, resulting in | |
| 608 // an endless loop. This condition is probably even more unlikely than | |
| 609 // the first. | |
| 610 // | |
| 611 // Although both cases could be avoided by using locks or thread local | |
| 612 // last_addr, these solutions are unnecessary complication: this | |
| 613 // handler is a best-effort safety net, not a complete solution. It is | |
| 614 // disabled by default and should only be used as a workaround in case | |
| 615 // we missed any no-execute-unsafe VM code. | |
| 616 | |
| 617 last_addr = addr; | |
| 618 } | |
| 619 } | |
| 620 } | |
| 621 | |
| 622 if (stub != NULL) { | |
| 623 // save all thread context in case we need to restore it | |
| 624 | |
| 625 if (thread != NULL) thread->set_saved_exception_pc(pc); | |
| 626 // 12/02/99: On Sparc it appears that the full context is also saved | |
| 627 // but as yet, no one looks at or restores that saved context | |
| 628 // factor me: setPC | |
| 629 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub; | |
| 630 return true; | |
| 631 } | |
| 632 | |
| 633 // signal-chaining | |
| 634 if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
| 635 return true; | |
| 636 } | |
| 637 | |
| 638 #ifndef AMD64 | |
| 639 // Workaround (bug 4900493) for Solaris kernel bug 4966651. | |
| 640 // Handle an undefined selector caused by an attempt to assign | |
| 641 // fs in libthread getipriptr(). With the current libthread design every 512 | |
| 642 // thread creations the LDT for a private thread data structure is extended | |
| 643 // and thre is a hazard that and another thread attempting a thread creation | |
| 644 // will use a stale LDTR that doesn't reflect the structure's growth, | |
| 645 // causing a GP fault. | |
| 646 // Enforce the probable limit of passes through here to guard against an | |
| 647 // infinite loop if some other move to fs caused the GP fault. Note that | |
| 648 // this loop counter is ultimately a heuristic as it is possible for | |
| 649 // more than one thread to generate this fault at a time in an MP system. | |
| 650 // In the case of the loop count being exceeded or if the poll fails | |
| 651 // just fall through to a fatal error. | |
| 652 // If there is some other source of T_GPFLT traps and the text at EIP is | |
| 653 // unreadable this code will loop infinitely until the stack is exausted. | |
| 654 // The key to diagnosis in this case is to look for the bottom signal handler | |
| 655 // frame. | |
| 656 | |
| 657 if(! IgnoreLibthreadGPFault) { | |
| 658 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) { | |
| 659 const unsigned char *p = | |
| 660 (unsigned const char *) uc->uc_mcontext.gregs[EIP]; | |
| 661 | |
| 662 // Expected instruction? | |
| 663 | |
| 664 if(p[0] == movlfs[0] && p[1] == movlfs[1]) { | |
| 665 | |
| 666 Atomic::inc(&ldtr_refresh); | |
| 667 | |
| 668 // Infinite loop? | |
| 669 | |
| 670 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) { | |
| 671 | |
| 672 // No, force scheduling to get a fresh view of the LDTR | |
| 673 | |
| 674 if(poll(NULL, 0, 10) == 0) { | |
| 675 | |
| 676 // Retry the move | |
| 677 | |
| 678 return false; | |
| 679 } | |
| 680 } | |
| 681 } | |
| 682 } | |
| 683 } | |
| 684 #endif // !AMD64 | |
| 685 | |
| 686 if (!abort_if_unrecognized) { | |
| 687 // caller wants another chance, so give it to him | |
| 688 return false; | |
| 689 } | |
| 690 | |
| 691 if (!os::Solaris::libjsig_is_loaded) { | |
| 692 struct sigaction oldAct; | |
| 693 sigaction(sig, (struct sigaction *)0, &oldAct); | |
| 694 if (oldAct.sa_sigaction != signalHandler) { | |
| 695 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 696 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 605 | 697 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand); |
| 0 | 698 } |
| 699 } | |
| 700 | |
| 701 if (pc == NULL && uc != NULL) { | |
| 702 pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
| 703 } | |
| 704 | |
| 705 // unmask current signal | |
| 706 sigset_t newset; | |
| 707 sigemptyset(&newset); | |
| 708 sigaddset(&newset, sig); | |
| 709 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
| 710 | |
| 711 VMError err(t, sig, pc, info, ucVoid); | |
| 712 err.report_and_die(); | |
| 713 | |
| 714 ShouldNotReachHere(); | |
| 715 } | |
| 716 | |
| 717 void os::print_context(outputStream *st, void *context) { | |
| 718 if (context == NULL) return; | |
| 719 | |
| 720 ucontext_t *uc = (ucontext_t*)context; | |
| 721 st->print_cr("Registers:"); | |
| 722 #ifdef AMD64 | |
| 723 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); | |
| 724 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); | |
| 725 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); | |
| 726 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); | |
| 727 st->cr(); | |
| 728 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); | |
| 729 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); | |
| 730 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); | |
| 731 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); | |
| 732 st->cr(); | |
| 1250 | 733 st->print( "R8=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); |
| 0 | 734 st->print(", R9=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); |
| 735 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); | |
| 736 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); | |
| 1250 | 737 st->cr(); |
| 738 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); | |
| 0 | 739 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); |
| 740 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); | |
| 741 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); | |
| 742 st->cr(); | |
| 743 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); | |
| 744 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]); | |
| 745 #else | |
| 746 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]); | |
| 747 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]); | |
| 748 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]); | |
| 749 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]); | |
| 750 st->cr(); | |
| 751 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]); | |
| 752 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]); | |
| 753 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]); | |
| 754 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]); | |
| 755 st->cr(); | |
| 756 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]); | |
| 757 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]); | |
| 758 #endif // AMD64 | |
| 759 st->cr(); | |
| 760 st->cr(); | |
| 761 | |
| 762 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc); | |
| 763 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
| 764 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); | |
| 765 st->cr(); | |
| 766 | |
| 767 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
| 768 // point to garbage if entry point in an nmethod is corrupted. Leave | |
| 769 // this at the end, and hope for the best. | |
| 770 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc); | |
| 771 address pc = epc.pc(); | |
| 772 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
| 773 print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); | |
| 774 } | |
| 775 | |
| 776 #ifdef AMD64 | |
| 777 void os::Solaris::init_thread_fpu_state(void) { | |
| 778 // Nothing to do | |
| 779 } | |
| 780 #else | |
| 781 // From solaris_i486.s | |
| 782 extern "C" void fixcw(); | |
| 783 | |
| 784 void os::Solaris::init_thread_fpu_state(void) { | |
| 785 // Set fpu to 53 bit precision. This happens too early to use a stub. | |
| 786 fixcw(); | |
| 787 } | |
| 788 | |
| 789 // These routines are the initial value of atomic_xchg_entry(), | |
| 790 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry() | |
| 791 // until initialization is complete. | |
| 792 // TODO - replace with .il implementation when compiler supports it. | |
| 793 | |
| 794 typedef jint xchg_func_t (jint, volatile jint*); | |
| 795 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); | |
| 796 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong); | |
| 797 typedef jint add_func_t (jint, volatile jint*); | |
| 798 | |
| 799 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { | |
| 800 // try to use the stub: | |
| 801 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); | |
| 802 | |
| 803 if (func != NULL) { | |
| 804 os::atomic_xchg_func = func; | |
| 805 return (*func)(exchange_value, dest); | |
| 806 } | |
| 807 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
| 808 | |
| 809 jint old_value = *dest; | |
| 810 *dest = exchange_value; | |
| 811 return old_value; | |
| 812 } | |
| 813 | |
| 814 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { | |
| 815 // try to use the stub: | |
| 816 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); | |
| 817 | |
| 818 if (func != NULL) { | |
| 819 os::atomic_cmpxchg_func = func; | |
| 820 return (*func)(exchange_value, dest, compare_value); | |
| 821 } | |
| 822 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
| 823 | |
| 824 jint old_value = *dest; | |
| 825 if (old_value == compare_value) | |
| 826 *dest = exchange_value; | |
| 827 return old_value; | |
| 828 } | |
| 829 | |
| 830 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { | |
| 831 // try to use the stub: | |
| 832 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); | |
| 833 | |
| 834 if (func != NULL) { | |
| 835 os::atomic_cmpxchg_long_func = func; | |
| 836 return (*func)(exchange_value, dest, compare_value); | |
| 837 } | |
| 838 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
| 839 | |
| 840 jlong old_value = *dest; | |
| 841 if (old_value == compare_value) | |
| 842 *dest = exchange_value; | |
| 843 return old_value; | |
| 844 } | |
| 845 | |
| 846 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { | |
| 847 // try to use the stub: | |
| 848 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); | |
| 849 | |
| 850 if (func != NULL) { | |
| 851 os::atomic_add_func = func; | |
| 852 return (*func)(add_value, dest); | |
| 853 } | |
| 854 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
| 855 | |
| 856 return (*dest) += add_value; | |
| 857 } | |
| 858 | |
| 859 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; | |
| 860 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; | |
| 861 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; | |
| 862 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; | |
| 863 | |
| 864 extern "C" _solaris_raw_setup_fpu(address ptr); | |
| 865 void os::setup_fpu() { | |
| 866 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); | |
| 867 _solaris_raw_setup_fpu(fpu_cntrl); | |
| 868 } | |
| 869 #endif // AMD64 |