1 /* 2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "asm/macroAssembler.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "interpreter/interpreter.hpp" 33 #include "jvm_solaris.h" 34 #include "memory/allocation.inline.hpp" 35 #include "mutex_solaris.inline.hpp" 36 #include "os_share_solaris.hpp" 37 #include "prims/jniFastGetField.hpp" 38 #include "prims/jvm.h" 39 #include "prims/jvm_misc.hpp" 40 #include "runtime/arguments.hpp" 41 #include "runtime/extendedPC.hpp" 42 #include "runtime/frame.inline.hpp" 43 #include "runtime/interfaceSupport.hpp" 44 #include "runtime/java.hpp" 45 #include "runtime/javaCalls.hpp" 46 #include "runtime/mutexLocker.hpp" 47 #include "runtime/osThread.hpp" 48 #include "runtime/sharedRuntime.hpp" 49 #include "runtime/stubRoutines.hpp" 50 #include "runtime/thread.inline.hpp" 51 #include "runtime/timer.hpp" 52 #include "utilities/events.hpp" 53 #include "utilities/vmError.hpp" 54 55 // put OS-includes here 56 # include <sys/types.h> 57 # include <sys/mman.h> 58 # include <pthread.h> 59 # include <signal.h> 60 # include <setjmp.h> 61 # include <errno.h> 62 # include <dlfcn.h> 63 # include <stdio.h> 64 # include <unistd.h> 65 # include <sys/resource.h> 66 # include <thread.h> 67 # include <sys/stat.h> 68 # include <sys/time.h> 69 # include <sys/filio.h> 70 # include <sys/utsname.h> 71 # include <sys/systeminfo.h> 72 # include <sys/socket.h> 73 # include <sys/trap.h> 74 # include <sys/lwp.h> 75 # include <pwd.h> 76 # include <poll.h> 77 # include <sys/lwp.h> 78 # include <procfs.h> // see comment in <sys/procfs.h> 79 80 #ifndef AMD64 81 // QQQ seems useless at this point 82 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 83 #endif // AMD64 84 # include <sys/procfs.h> // see comment in <sys/procfs.h> 85 86 87 #define MAX_PATH (2 * K) 88 89 // Minimum stack size for the VM. It's easier to document a constant value 90 // but it's different for x86 and sparc because the page sizes are different. 91 #ifdef AMD64 92 size_t os::Solaris::min_stack_allowed = 224*K; 93 #define REG_SP REG_RSP 94 #define REG_PC REG_RIP 95 #define REG_FP REG_RBP 96 #else 97 size_t os::Solaris::min_stack_allowed = 64*K; 98 #define REG_SP UESP 99 #define REG_PC EIP 100 #define REG_FP EBP 101 // 4900493 counter to prevent runaway LDTR refresh attempt 102 103 static volatile int ldtr_refresh = 0; 104 // the libthread instruction that faults because of the stale LDTR 105 106 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs 107 }; 108 #endif // AMD64 109 110 char* os::non_memory_address_word() { 111 // Must never look like an address returned by reserve_memory, 112 // even in its subfields (as defined by the CPU immediate fields, 113 // if the CPU splits constants across multiple instructions). 114 return (char*) -1; 115 } 116 117 // 118 // Validate a ucontext retrieved from walking a uc_link of a ucontext. 119 // There are issues with libthread giving out uc_links for different threads 120 // on the same uc_link chain and bad or circular links. 121 // 122 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) { 123 if (valid >= suspect || 124 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags || 125 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp || 126 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) { 127 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");) 128 return false; 129 } 130 131 if (thread->is_Java_thread()) { 132 if (!valid_stack_address(thread, (address)suspect)) { 133 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");) 134 return false; 135 } 136 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) { 137 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");) 138 return false; 139 } 140 } 141 return true; 142 } 143 144 // We will only follow one level of uc_link since there are libthread 145 // issues with ucontext linking and it is better to be safe and just 146 // let caller retry later. 147 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread, 148 ucontext_t *uc) { 149 150 ucontext_t *retuc = NULL; 151 152 if (uc != NULL) { 153 if (uc->uc_link == NULL) { 154 // cannot validate without uc_link so accept current ucontext 155 retuc = uc; 156 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { 157 // first ucontext is valid so try the next one 158 uc = uc->uc_link; 159 if (uc->uc_link == NULL) { 160 // cannot validate without uc_link so accept current ucontext 161 retuc = uc; 162 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { 163 // the ucontext one level down is also valid so return it 164 retuc = uc; 165 } 166 } 167 } 168 return retuc; 169 } 170 171 // Assumes ucontext is valid 172 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) { 173 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]); 174 } 175 176 // Assumes ucontext is valid 177 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) { 178 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; 179 } 180 181 // Assumes ucontext is valid 182 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) { 183 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; 184 } 185 186 address os::Solaris::ucontext_get_pc(ucontext_t *uc) { 187 return (address) uc->uc_mcontext.gregs[REG_PC]; 188 } 189 190 // For Forte Analyzer AsyncGetCallTrace profiling support - thread 191 // is currently interrupted by SIGPROF. 192 // 193 // The difference between this and os::fetch_frame_from_context() is that 194 // here we try to skip nested signal frames. 195 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread, 196 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { 197 198 assert(thread != NULL, "just checking"); 199 assert(ret_sp != NULL, "just checking"); 200 assert(ret_fp != NULL, "just checking"); 201 202 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc); 203 return os::fetch_frame_from_context(luc, ret_sp, ret_fp); 204 } 205 206 ExtendedPC os::fetch_frame_from_context(void* ucVoid, 207 intptr_t** ret_sp, intptr_t** ret_fp) { 208 209 ExtendedPC epc; 210 ucontext_t *uc = (ucontext_t*)ucVoid; 211 212 if (uc != NULL) { 213 epc = os::Solaris::ucontext_get_ExtendedPC(uc); 214 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc); 215 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc); 216 } else { 217 // construct empty ExtendedPC for return value checking 218 epc = ExtendedPC(NULL); 219 if (ret_sp) *ret_sp = (intptr_t *)NULL; 220 if (ret_fp) *ret_fp = (intptr_t *)NULL; 221 } 222 223 return epc; 224 } 225 226 frame os::fetch_frame_from_context(void* ucVoid) { 227 intptr_t* sp; 228 intptr_t* fp; 229 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 230 return frame(sp, fp, epc.pc()); 231 } 232 233 frame os::get_sender_for_C_frame(frame* fr) { 234 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 235 } 236 237 extern "C" intptr_t *_get_current_sp(); // in .il file 238 239 address os::current_stack_pointer() { 240 return (address)_get_current_sp(); 241 } 242 243 extern "C" intptr_t *_get_current_fp(); // in .il file 244 245 frame os::current_frame() { 246 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp 247 frame myframe((intptr_t*)os::current_stack_pointer(), 248 (intptr_t*)fp, 249 CAST_FROM_FN_PTR(address, os::current_frame)); 250 if (os::is_first_C_frame(&myframe)) { 251 // stack is not walkable 252 frame ret; // This will be a null useless frame 253 return ret; 254 } else { 255 return os::get_sender_for_C_frame(&myframe); 256 } 257 } 258 259 #ifndef AMD64 260 261 // Detecting SSE support by OS 262 // From solaris_i486.s 263 extern "C" bool sse_check(); 264 extern "C" bool sse_unavailable(); 265 266 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED}; 267 static int sse_status = SSE_UNKNOWN; 268 269 270 static void check_for_sse_support() { 271 if (!VM_Version::supports_sse()) { 272 sse_status = SSE_NOT_SUPPORTED; 273 return; 274 } 275 // looking for _sse_hw in libc.so, if it does not exist or 276 // the value (int) is 0, OS has no support for SSE 277 int *sse_hwp; 278 void *h; 279 280 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) { 281 //open failed, presume no support for SSE 282 sse_status = SSE_NOT_SUPPORTED; 283 return; 284 } 285 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) { 286 sse_status = SSE_NOT_SUPPORTED; 287 } else if (*sse_hwp == 0) { 288 sse_status = SSE_NOT_SUPPORTED; 289 } 290 dlclose(h); 291 292 if (sse_status == SSE_UNKNOWN) { 293 bool (*try_sse)() = (bool (*)())sse_check; 294 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED; 295 } 296 297 } 298 299 #endif // AMD64 300 301 bool os::supports_sse() { 302 #ifdef AMD64 303 return true; 304 #else 305 if (sse_status == SSE_UNKNOWN) 306 check_for_sse_support(); 307 return sse_status == SSE_SUPPORTED; 308 #endif // AMD64 309 } 310 311 bool os::is_allocatable(size_t bytes) { 312 #ifdef AMD64 313 return true; 314 #else 315 316 if (bytes < 2 * G) { 317 return true; 318 } 319 320 char* addr = reserve_memory(bytes, NULL); 321 322 if (addr != NULL) { 323 release_memory(addr, bytes); 324 } 325 326 return addr != NULL; 327 #endif // AMD64 328 329 } 330 331 extern "C" JNIEXPORT int 332 JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, 333 int abort_if_unrecognized) { 334 ucontext_t* uc = (ucontext_t*) ucVoid; 335 336 #ifndef AMD64 337 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) { 338 // the SSE instruction faulted. supports_sse() need return false. 339 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable; 340 return true; 341 } 342 #endif // !AMD64 343 344 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 345 346 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 347 // (no destructors can be run) 348 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 349 350 SignalHandlerMark shm(t); 351 352 if(sig == SIGPIPE || sig == SIGXFSZ) { 353 if (os::Solaris::chained_handler(sig, info, ucVoid)) { 354 return true; 355 } else { 356 if (PrintMiscellaneous && (WizardMode || Verbose)) { 357 char buf[64]; 358 warning("Ignoring %s - see 4229104 or 6499219", 359 os::exception_name(sig, buf, sizeof(buf))); 360 361 } 362 return true; 363 } 364 } 365 366 JavaThread* thread = NULL; 367 VMThread* vmthread = NULL; 368 369 if (os::Solaris::signal_handlers_are_installed) { 370 if (t != NULL ){ 371 if(t->is_Java_thread()) { 372 thread = (JavaThread*)t; 373 } 374 else if(t->is_VM_thread()){ 375 vmthread = (VMThread *)t; 376 } 377 } 378 } 379 380 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs"); 381 382 if (sig == os::Solaris::SIGasync()) { 383 if(thread || vmthread){ 384 OSThread::SR_handler(t, uc); 385 return true; 386 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) { 387 return true; 388 } else { 389 // If os::Solaris::SIGasync not chained, and this is a non-vm and 390 // non-java thread 391 return true; 392 } 393 } 394 395 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { 396 // can't decode this kind of signal 397 info = NULL; 398 } else { 399 assert(sig == info->si_signo, "bad siginfo"); 400 } 401 402 // decide if this trap can be handled by a stub 403 address stub = NULL; 404 405 address pc = NULL; 406 407 //%note os_trap_1 408 if (info != NULL && uc != NULL && thread != NULL) { 409 // factor me: getPCfromContext 410 pc = (address) uc->uc_mcontext.gregs[REG_PC]; 411 412 if (StubRoutines::is_safefetch_fault(pc)) { 413 uc->uc_mcontext.gregs[REG_PC] = intptr_t(StubRoutines::continuation_for_safefetch_fault(pc)); 414 return true; 415 } 416 417 // Handle ALL stack overflow variations here 418 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) { 419 address addr = (address) info->si_addr; 420 if (thread->in_stack_yellow_zone(addr)) { 421 thread->disable_stack_yellow_zone(); 422 if (thread->thread_state() == _thread_in_Java) { 423 // Throw a stack overflow exception. Guard pages will be reenabled 424 // while unwinding the stack. 425 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 426 } else { 427 // Thread was in the vm or native code. Return and try to finish. 428 return true; 429 } 430 } else if (thread->in_stack_red_zone(addr)) { 431 // Fatal red zone violation. Disable the guard pages and fall through 432 // to handle_unexpected_exception way down below. 433 thread->disable_stack_red_zone(); 434 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 435 } 436 } 437 438 if ((sig == SIGSEGV) && VM_Version::is_cpuinfo_segv_addr(pc)) { 439 // Verify that OS save/restore AVX registers. 440 stub = VM_Version::cpuinfo_cont_addr(); 441 } 442 443 if (thread->thread_state() == _thread_in_vm) { 444 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) { 445 stub = StubRoutines::handler_for_unsafe_access(); 446 } 447 } 448 449 if (thread->thread_state() == _thread_in_Java) { 450 // Support Safepoint Polling 451 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { 452 stub = SharedRuntime::get_poll_stub(pc); 453 } 454 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) { 455 // BugId 4454115: A read from a MappedByteBuffer can fault 456 // here if the underlying file has been truncated. 457 // Do not crash the VM in such a case. 458 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 459 if (cb != NULL) { 460 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; 461 if (nm != NULL && nm->has_unsafe_access()) { 462 stub = StubRoutines::handler_for_unsafe_access(); 463 } 464 } 465 } 466 else 467 if (sig == SIGFPE && info->si_code == FPE_INTDIV) { 468 // integer divide by zero 469 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 470 } 471 #ifndef AMD64 472 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) { 473 // floating-point divide by zero 474 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 475 } 476 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) { 477 // The encoding of D2I in i486.ad can cause an exception prior 478 // to the fist instruction if there was an invalid operation 479 // pending. We want to dismiss that exception. From the win_32 480 // side it also seems that if it really was the fist causing 481 // the exception that we do the d2i by hand with different 482 // rounding. Seems kind of weird. QQQ TODO 483 // Note that we take the exception at the NEXT floating point instruction. 484 if (pc[0] == 0xDB) { 485 assert(pc[0] == 0xDB, "not a FIST opcode"); 486 assert(pc[1] == 0x14, "not a FIST opcode"); 487 assert(pc[2] == 0x24, "not a FIST opcode"); 488 return true; 489 } else { 490 assert(pc[-3] == 0xDB, "not an flt invalid opcode"); 491 assert(pc[-2] == 0x14, "not an flt invalid opcode"); 492 assert(pc[-1] == 0x24, "not an flt invalid opcode"); 493 } 494 } 495 else if (sig == SIGFPE ) { 496 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code); 497 } 498 #endif // !AMD64 499 500 // QQQ It doesn't seem that we need to do this on x86 because we should be able 501 // to return properly from the handler without this extra stuff on the back side. 502 503 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { 504 // Determination of interpreter/vtable stub/compiled code null exception 505 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 506 } 507 } 508 509 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 510 // and the heap gets shrunk before the field access. 511 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 512 address addr = JNI_FastGetField::find_slowcase_pc(pc); 513 if (addr != (address)-1) { 514 stub = addr; 515 } 516 } 517 518 // Check to see if we caught the safepoint code in the 519 // process of write protecting the memory serialization page. 520 // It write enables the page immediately after protecting it 521 // so we can just return to retry the write. 522 if ((sig == SIGSEGV) && 523 os::is_memory_serialize_page(thread, (address)info->si_addr)) { 524 // Block current thread until the memory serialize page permission restored. 525 os::block_on_serialize_page_trap(); 526 return true; 527 } 528 } 529 530 // Execution protection violation 531 // 532 // Preventative code for future versions of Solaris which may 533 // enable execution protection when running the 32-bit VM on AMD64. 534 // 535 // This should be kept as the last step in the triage. We don't 536 // have a dedicated trap number for a no-execute fault, so be 537 // conservative and allow other handlers the first shot. 538 // 539 // Note: We don't test that info->si_code == SEGV_ACCERR here. 540 // this si_code is so generic that it is almost meaningless; and 541 // the si_code for this condition may change in the future. 542 // Furthermore, a false-positive should be harmless. 543 if (UnguardOnExecutionViolation > 0 && 544 (sig == SIGSEGV || sig == SIGBUS) && 545 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault 546 int page_size = os::vm_page_size(); 547 address addr = (address) info->si_addr; 548 address pc = (address) uc->uc_mcontext.gregs[REG_PC]; 549 // Make sure the pc and the faulting address are sane. 550 // 551 // If an instruction spans a page boundary, and the page containing 552 // the beginning of the instruction is executable but the following 553 // page is not, the pc and the faulting address might be slightly 554 // different - we still want to unguard the 2nd page in this case. 555 // 556 // 15 bytes seems to be a (very) safe value for max instruction size. 557 bool pc_is_near_addr = 558 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 559 bool instr_spans_page_boundary = 560 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 561 (intptr_t) page_size) > 0); 562 563 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 564 static volatile address last_addr = 565 (address) os::non_memory_address_word(); 566 567 // In conservative mode, don't unguard unless the address is in the VM 568 if (addr != last_addr && 569 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 570 571 // Make memory rwx and retry 572 address page_start = 573 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 574 bool res = os::protect_memory((char*) page_start, page_size, 575 os::MEM_PROT_RWX); 576 577 if (PrintMiscellaneous && Verbose) { 578 char buf[256]; 579 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 580 "at " INTPTR_FORMAT 581 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, 582 page_start, (res ? "success" : "failed"), errno); 583 tty->print_raw_cr(buf); 584 } 585 stub = pc; 586 587 // Set last_addr so if we fault again at the same address, we don't end 588 // up in an endless loop. 589 // 590 // There are two potential complications here. Two threads trapping at 591 // the same address at the same time could cause one of the threads to 592 // think it already unguarded, and abort the VM. Likely very rare. 593 // 594 // The other race involves two threads alternately trapping at 595 // different addresses and failing to unguard the page, resulting in 596 // an endless loop. This condition is probably even more unlikely than 597 // the first. 598 // 599 // Although both cases could be avoided by using locks or thread local 600 // last_addr, these solutions are unnecessary complication: this 601 // handler is a best-effort safety net, not a complete solution. It is 602 // disabled by default and should only be used as a workaround in case 603 // we missed any no-execute-unsafe VM code. 604 605 last_addr = addr; 606 } 607 } 608 } 609 610 if (stub != NULL) { 611 // save all thread context in case we need to restore it 612 613 if (thread != NULL) thread->set_saved_exception_pc(pc); 614 // 12/02/99: On Sparc it appears that the full context is also saved 615 // but as yet, no one looks at or restores that saved context 616 // factor me: setPC 617 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub; 618 return true; 619 } 620 621 // signal-chaining 622 if (os::Solaris::chained_handler(sig, info, ucVoid)) { 623 return true; 624 } 625 626 #ifndef AMD64 627 // Workaround (bug 4900493) for Solaris kernel bug 4966651. 628 // Handle an undefined selector caused by an attempt to assign 629 // fs in libthread getipriptr(). With the current libthread design every 512 630 // thread creations the LDT for a private thread data structure is extended 631 // and thre is a hazard that and another thread attempting a thread creation 632 // will use a stale LDTR that doesn't reflect the structure's growth, 633 // causing a GP fault. 634 // Enforce the probable limit of passes through here to guard against an 635 // infinite loop if some other move to fs caused the GP fault. Note that 636 // this loop counter is ultimately a heuristic as it is possible for 637 // more than one thread to generate this fault at a time in an MP system. 638 // In the case of the loop count being exceeded or if the poll fails 639 // just fall through to a fatal error. 640 // If there is some other source of T_GPFLT traps and the text at EIP is 641 // unreadable this code will loop infinitely until the stack is exausted. 642 // The key to diagnosis in this case is to look for the bottom signal handler 643 // frame. 644 645 if(! IgnoreLibthreadGPFault) { 646 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) { 647 const unsigned char *p = 648 (unsigned const char *) uc->uc_mcontext.gregs[EIP]; 649 650 // Expected instruction? 651 652 if(p[0] == movlfs[0] && p[1] == movlfs[1]) { 653 654 Atomic::inc(&ldtr_refresh); 655 656 // Infinite loop? 657 658 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) { 659 660 // No, force scheduling to get a fresh view of the LDTR 661 662 if(poll(NULL, 0, 10) == 0) { 663 664 // Retry the move 665 666 return false; 667 } 668 } 669 } 670 } 671 } 672 #endif // !AMD64 673 674 if (!abort_if_unrecognized) { 675 // caller wants another chance, so give it to him 676 return false; 677 } 678 679 if (!os::Solaris::libjsig_is_loaded) { 680 struct sigaction oldAct; 681 sigaction(sig, (struct sigaction *)0, &oldAct); 682 if (oldAct.sa_sigaction != signalHandler) { 683 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 684 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 685 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand); 686 } 687 } 688 689 if (pc == NULL && uc != NULL) { 690 pc = (address) uc->uc_mcontext.gregs[REG_PC]; 691 } 692 693 // unmask current signal 694 sigset_t newset; 695 sigemptyset(&newset); 696 sigaddset(&newset, sig); 697 sigprocmask(SIG_UNBLOCK, &newset, NULL); 698 699 // Determine which sort of error to throw. Out of swap may signal 700 // on the thread stack, which could get a mapping error when touched. 701 address addr = (address) info->si_addr; 702 if (sig == SIGBUS && info->si_code == BUS_OBJERR && info->si_errno == ENOMEM) { 703 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "Out of swap space to map in thread stack."); 704 } 705 706 VMError err(t, sig, pc, info, ucVoid); 707 err.report_and_die(); 708 709 ShouldNotReachHere(); 710 return false; 711 } 712 713 void os::print_context(outputStream *st, void *context) { 714 if (context == NULL) return; 715 716 ucontext_t *uc = (ucontext_t*)context; 717 st->print_cr("Registers:"); 718 #ifdef AMD64 719 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); 720 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); 721 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); 722 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); 723 st->cr(); 724 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); 725 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); 726 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); 727 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); 728 st->cr(); 729 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); 730 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); 731 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); 732 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); 733 st->cr(); 734 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); 735 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); 736 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); 737 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); 738 st->cr(); 739 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); 740 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]); 741 #else 742 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]); 743 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]); 744 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]); 745 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]); 746 st->cr(); 747 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]); 748 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]); 749 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]); 750 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]); 751 st->cr(); 752 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]); 753 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]); 754 #endif // AMD64 755 st->cr(); 756 st->cr(); 757 758 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc); 759 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 760 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); 761 st->cr(); 762 763 // Note: it may be unsafe to inspect memory near pc. For example, pc may 764 // point to garbage if entry point in an nmethod is corrupted. Leave 765 // this at the end, and hope for the best. 766 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc); 767 address pc = epc.pc(); 768 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); 769 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 770 } 771 772 void os::print_register_info(outputStream *st, void *context) { 773 if (context == NULL) return; 774 775 ucontext_t *uc = (ucontext_t*)context; 776 777 st->print_cr("Register to memory mapping:"); 778 st->cr(); 779 780 // this is horrendously verbose but the layout of the registers in the 781 // context does not match how we defined our abstract Register set, so 782 // we can't just iterate through the gregs area 783 784 // this is only for the "general purpose" registers 785 786 #ifdef AMD64 787 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); 788 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); 789 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); 790 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); 791 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); 792 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); 793 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); 794 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); 795 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); 796 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); 797 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); 798 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); 799 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); 800 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); 801 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); 802 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); 803 #else 804 st->print("EAX="); print_location(st, uc->uc_mcontext.gregs[EAX]); 805 st->print("EBX="); print_location(st, uc->uc_mcontext.gregs[EBX]); 806 st->print("ECX="); print_location(st, uc->uc_mcontext.gregs[ECX]); 807 st->print("EDX="); print_location(st, uc->uc_mcontext.gregs[EDX]); 808 st->print("ESP="); print_location(st, uc->uc_mcontext.gregs[UESP]); 809 st->print("EBP="); print_location(st, uc->uc_mcontext.gregs[EBP]); 810 st->print("ESI="); print_location(st, uc->uc_mcontext.gregs[ESI]); 811 st->print("EDI="); print_location(st, uc->uc_mcontext.gregs[EDI]); 812 #endif 813 814 st->cr(); 815 } 816 817 818 #ifdef AMD64 819 void os::Solaris::init_thread_fpu_state(void) { 820 // Nothing to do 821 } 822 #else 823 // From solaris_i486.s 824 extern "C" void fixcw(); 825 826 void os::Solaris::init_thread_fpu_state(void) { 827 // Set fpu to 53 bit precision. This happens too early to use a stub. 828 fixcw(); 829 } 830 831 // These routines are the initial value of atomic_xchg_entry(), 832 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry() 833 // until initialization is complete. 834 // TODO - replace with .il implementation when compiler supports it. 835 836 typedef jint xchg_func_t (jint, volatile jint*); 837 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); 838 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong); 839 typedef jint add_func_t (jint, volatile jint*); 840 841 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { 842 // try to use the stub: 843 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); 844 845 if (func != NULL) { 846 os::atomic_xchg_func = func; 847 return (*func)(exchange_value, dest); 848 } 849 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 850 851 jint old_value = *dest; 852 *dest = exchange_value; 853 return old_value; 854 } 855 856 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { 857 // try to use the stub: 858 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); 859 860 if (func != NULL) { 861 os::atomic_cmpxchg_func = func; 862 return (*func)(exchange_value, dest, compare_value); 863 } 864 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 865 866 jint old_value = *dest; 867 if (old_value == compare_value) 868 *dest = exchange_value; 869 return old_value; 870 } 871 872 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { 873 // try to use the stub: 874 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); 875 876 if (func != NULL) { 877 os::atomic_cmpxchg_long_func = func; 878 return (*func)(exchange_value, dest, compare_value); 879 } 880 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 881 882 jlong old_value = *dest; 883 if (old_value == compare_value) 884 *dest = exchange_value; 885 return old_value; 886 } 887 888 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { 889 // try to use the stub: 890 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); 891 892 if (func != NULL) { 893 os::atomic_add_func = func; 894 return (*func)(add_value, dest); 895 } 896 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 897 898 return (*dest) += add_value; 899 } 900 901 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; 902 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; 903 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; 904 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; 905 906 extern "C" void _solaris_raw_setup_fpu(address ptr); 907 void os::setup_fpu() { 908 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); 909 _solaris_raw_setup_fpu(fpu_cntrl); 910 } 911 #endif // AMD64 912 913 #ifndef PRODUCT 914 void os::verify_stack_alignment() { 915 #ifdef AMD64 916 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 917 #endif 918 } 919 #endif