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/atomic.inline.hpp" 42 #include "runtime/extendedPC.hpp" 43 #include "runtime/frame.inline.hpp" 44 #include "runtime/interfaceSupport.hpp" 45 #include "runtime/java.hpp" 46 #include "runtime/javaCalls.hpp" 47 #include "runtime/mutexLocker.hpp" 48 #include "runtime/osThread.hpp" 49 #include "runtime/sharedRuntime.hpp" 50 #include "runtime/stubRoutines.hpp" 51 #include "runtime/thread.inline.hpp" 52 #include "runtime/timer.hpp" 53 #include "utilities/events.hpp" 54 #include "utilities/vmError.hpp" 55 56 // put OS-includes here 57 # include <sys/types.h> 58 # include <sys/mman.h> 59 # include <pthread.h> 60 # include <signal.h> 61 # include <setjmp.h> 62 # include <errno.h> 63 # include <dlfcn.h> 64 # include <stdio.h> 65 # include <unistd.h> 66 # include <sys/resource.h> 67 # include <thread.h> 68 # include <sys/stat.h> 69 # include <sys/time.h> 70 # include <sys/filio.h> 71 # include <sys/utsname.h> 72 # include <sys/systeminfo.h> 73 # include <sys/socket.h> 74 # include <sys/trap.h> 75 # include <sys/lwp.h> 76 # include <pwd.h> 77 # include <poll.h> 78 # include <sys/lwp.h> 79 # include <procfs.h> // see comment in <sys/procfs.h> 80 81 #ifndef AMD64 82 // QQQ seems useless at this point 83 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 84 #endif // AMD64 85 # include <sys/procfs.h> // see comment in <sys/procfs.h> 86 87 88 #define MAX_PATH (2 * K) 89 90 // Minimum stack size for the VM. It's easier to document a constant value 91 // but it's different for x86 and sparc because the page sizes are different. 92 #ifdef AMD64 93 size_t os::Solaris::min_stack_allowed = 224*K; 94 #define REG_SP REG_RSP 95 #define REG_PC REG_RIP 96 #define REG_FP REG_RBP 97 #else 98 size_t os::Solaris::min_stack_allowed = 64*K; 99 #define REG_SP UESP 100 #define REG_PC EIP 101 #define REG_FP EBP 102 // 4900493 counter to prevent runaway LDTR refresh attempt 103 104 static volatile int ldtr_refresh = 0; 105 // the libthread instruction that faults because of the stale LDTR 106 107 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs 108 }; 109 #endif // AMD64 110 111 char* os::non_memory_address_word() { 112 // Must never look like an address returned by reserve_memory, 113 // even in its subfields (as defined by the CPU immediate fields, 114 // if the CPU splits constants across multiple instructions). 115 return (char*) -1; 116 } 117 118 // 119 // Validate a ucontext retrieved from walking a uc_link of a ucontext. 120 // There are issues with libthread giving out uc_links for different threads 121 // on the same uc_link chain and bad or circular links. 122 // 123 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) { 124 if (valid >= suspect || 125 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags || 126 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp || 127 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) { 128 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");) 129 return false; 130 } 131 132 if (thread->is_Java_thread()) { 133 if (!valid_stack_address(thread, (address)suspect)) { 134 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");) 135 return false; 136 } 137 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) { 138 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");) 139 return false; 140 } 141 } 142 return true; 143 } 144 145 // We will only follow one level of uc_link since there are libthread 146 // issues with ucontext linking and it is better to be safe and just 147 // let caller retry later. 148 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread, 149 ucontext_t *uc) { 150 151 ucontext_t *retuc = NULL; 152 153 if (uc != NULL) { 154 if (uc->uc_link == NULL) { 155 // cannot validate without uc_link so accept current ucontext 156 retuc = uc; 157 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { 158 // first ucontext is valid so try the next one 159 uc = uc->uc_link; 160 if (uc->uc_link == NULL) { 161 // cannot validate without uc_link so accept current ucontext 162 retuc = uc; 163 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { 164 // the ucontext one level down is also valid so return it 165 retuc = uc; 166 } 167 } 168 } 169 return retuc; 170 } 171 172 // Assumes ucontext is valid 173 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) { 174 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]); 175 } 176 177 // Assumes ucontext is valid 178 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) { 179 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; 180 } 181 182 // Assumes ucontext is valid 183 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) { 184 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; 185 } 186 187 address os::Solaris::ucontext_get_pc(ucontext_t *uc) { 188 return (address) uc->uc_mcontext.gregs[REG_PC]; 189 } 190 191 // For Forte Analyzer AsyncGetCallTrace profiling support - thread 192 // is currently interrupted by SIGPROF. 193 // 194 // The difference between this and os::fetch_frame_from_context() is that 195 // here we try to skip nested signal frames. 196 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread, 197 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { 198 199 assert(thread != NULL, "just checking"); 200 assert(ret_sp != NULL, "just checking"); 201 assert(ret_fp != NULL, "just checking"); 202 203 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc); 204 return os::fetch_frame_from_context(luc, ret_sp, ret_fp); 205 } 206 207 ExtendedPC os::fetch_frame_from_context(void* ucVoid, 208 intptr_t** ret_sp, intptr_t** ret_fp) { 209 210 ExtendedPC epc; 211 ucontext_t *uc = (ucontext_t*)ucVoid; 212 213 if (uc != NULL) { 214 epc = os::Solaris::ucontext_get_ExtendedPC(uc); 215 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc); 216 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc); 217 } else { 218 // construct empty ExtendedPC for return value checking 219 epc = ExtendedPC(NULL); 220 if (ret_sp) *ret_sp = (intptr_t *)NULL; 221 if (ret_fp) *ret_fp = (intptr_t *)NULL; 222 } 223 224 return epc; 225 } 226 227 frame os::fetch_frame_from_context(void* ucVoid) { 228 intptr_t* sp; 229 intptr_t* fp; 230 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 231 return frame(sp, fp, epc.pc()); 232 } 233 234 frame os::get_sender_for_C_frame(frame* fr) { 235 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 236 } 237 238 extern "C" intptr_t *_get_current_sp(); // in .il file 239 240 address os::current_stack_pointer() { 241 return (address)_get_current_sp(); 242 } 243 244 extern "C" intptr_t *_get_current_fp(); // in .il file 245 246 frame os::current_frame() { 247 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp 248 frame myframe((intptr_t*)os::current_stack_pointer(), 249 (intptr_t*)fp, 250 CAST_FROM_FN_PTR(address, os::current_frame)); 251 if (os::is_first_C_frame(&myframe)) { 252 // stack is not walkable 253 frame ret; // This will be a null useless frame 254 return ret; 255 } else { 256 return os::get_sender_for_C_frame(&myframe); 257 } 258 } 259 260 #ifndef AMD64 261 262 // Detecting SSE support by OS 263 // From solaris_i486.s 264 extern "C" bool sse_check(); 265 extern "C" bool sse_unavailable(); 266 267 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED}; 268 static int sse_status = SSE_UNKNOWN; 269 270 271 static void check_for_sse_support() { 272 if (!VM_Version::supports_sse()) { 273 sse_status = SSE_NOT_SUPPORTED; 274 return; 275 } 276 // looking for _sse_hw in libc.so, if it does not exist or 277 // the value (int) is 0, OS has no support for SSE 278 int *sse_hwp; 279 void *h; 280 281 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) { 282 //open failed, presume no support for SSE 283 sse_status = SSE_NOT_SUPPORTED; 284 return; 285 } 286 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) { 287 sse_status = SSE_NOT_SUPPORTED; 288 } else if (*sse_hwp == 0) { 289 sse_status = SSE_NOT_SUPPORTED; 290 } 291 dlclose(h); 292 293 if (sse_status == SSE_UNKNOWN) { 294 bool (*try_sse)() = (bool (*)())sse_check; 295 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED; 296 } 297 298 } 299 300 #endif // AMD64 301 302 bool os::supports_sse() { 303 #ifdef AMD64 304 return true; 305 #else 306 if (sse_status == SSE_UNKNOWN) 307 check_for_sse_support(); 308 return sse_status == SSE_SUPPORTED; 309 #endif // AMD64 310 } 311 312 bool os::is_allocatable(size_t bytes) { 313 #ifdef AMD64 314 return true; 315 #else 316 317 if (bytes < 2 * G) { 318 return true; 319 } 320 321 char* addr = reserve_memory(bytes, NULL); 322 323 if (addr != NULL) { 324 release_memory(addr, bytes); 325 } 326 327 return addr != NULL; 328 #endif // AMD64 329 330 } 331 332 extern "C" JNIEXPORT int 333 JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, 334 int abort_if_unrecognized) { 335 ucontext_t* uc = (ucontext_t*) ucVoid; 336 337 #ifndef AMD64 338 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) { 339 // the SSE instruction faulted. supports_sse() need return false. 340 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable; 341 return true; 342 } 343 #endif // !AMD64 344 345 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 346 347 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 348 // (no destructors can be run) 349 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 350 351 SignalHandlerMark shm(t); 352 353 if(sig == SIGPIPE || sig == SIGXFSZ) { 354 if (os::Solaris::chained_handler(sig, info, ucVoid)) { 355 return true; 356 } else { 357 if (PrintMiscellaneous && (WizardMode || Verbose)) { 358 char buf[64]; 359 warning("Ignoring %s - see 4229104 or 6499219", 360 os::exception_name(sig, buf, sizeof(buf))); 361 362 } 363 return true; 364 } 365 } 366 367 JavaThread* thread = NULL; 368 VMThread* vmthread = NULL; 369 370 if (os::Solaris::signal_handlers_are_installed) { 371 if (t != NULL ){ 372 if(t->is_Java_thread()) { 373 thread = (JavaThread*)t; 374 } 375 else if(t->is_VM_thread()){ 376 vmthread = (VMThread *)t; 377 } 378 } 379 } 380 381 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs"); 382 383 if (sig == os::Solaris::SIGasync()) { 384 if(thread || vmthread){ 385 OSThread::SR_handler(t, uc); 386 return true; 387 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) { 388 return true; 389 } else { 390 // If os::Solaris::SIGasync not chained, and this is a non-vm and 391 // non-java thread 392 return true; 393 } 394 } 395 396 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { 397 // can't decode this kind of signal 398 info = NULL; 399 } else { 400 assert(sig == info->si_signo, "bad siginfo"); 401 } 402 403 // decide if this trap can be handled by a stub 404 address stub = NULL; 405 406 address pc = NULL; 407 408 //%note os_trap_1 409 if (info != NULL && uc != NULL && thread != NULL) { 410 // factor me: getPCfromContext 411 pc = (address) uc->uc_mcontext.gregs[REG_PC]; 412 413 if (StubRoutines::is_safefetch_fault(pc)) { 414 uc->uc_mcontext.gregs[REG_PC] = intptr_t(StubRoutines::continuation_for_safefetch_fault(pc)); 415 return true; 416 } 417 418 // Handle ALL stack overflow variations here 419 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) { 420 address addr = (address) info->si_addr; 421 if (thread->in_stack_yellow_zone(addr)) { 422 thread->disable_stack_yellow_zone(); 423 if (thread->thread_state() == _thread_in_Java) { 424 // Throw a stack overflow exception. Guard pages will be reenabled 425 // while unwinding the stack. 426 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 427 } else { 428 // Thread was in the vm or native code. Return and try to finish. 429 return true; 430 } 431 } else if (thread->in_stack_red_zone(addr)) { 432 // Fatal red zone violation. Disable the guard pages and fall through 433 // to handle_unexpected_exception way down below. 434 thread->disable_stack_red_zone(); 435 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 436 } 437 } 438 439 if ((sig == SIGSEGV) && VM_Version::is_cpuinfo_segv_addr(pc)) { 440 // Verify that OS save/restore AVX registers. 441 stub = VM_Version::cpuinfo_cont_addr(); 442 } 443 444 if (thread->thread_state() == _thread_in_vm) { 445 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) { 446 stub = StubRoutines::handler_for_unsafe_access(); 447 } 448 } 449 450 if (thread->thread_state() == _thread_in_Java) { 451 // Support Safepoint Polling 452 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { 453 stub = SharedRuntime::get_poll_stub(pc); 454 } 455 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) { 456 // BugId 4454115: A read from a MappedByteBuffer can fault 457 // here if the underlying file has been truncated. 458 // Do not crash the VM in such a case. 459 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 460 if (cb != NULL) { 461 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; 462 if (nm != NULL && nm->has_unsafe_access()) { 463 stub = StubRoutines::handler_for_unsafe_access(); 464 } 465 } 466 } 467 else 468 if (sig == SIGFPE && info->si_code == FPE_INTDIV) { 469 // integer divide by zero 470 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 471 } 472 #ifndef AMD64 473 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) { 474 // floating-point divide by zero 475 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 476 } 477 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) { 478 // The encoding of D2I in i486.ad can cause an exception prior 479 // to the fist instruction if there was an invalid operation 480 // pending. We want to dismiss that exception. From the win_32 481 // side it also seems that if it really was the fist causing 482 // the exception that we do the d2i by hand with different 483 // rounding. Seems kind of weird. QQQ TODO 484 // Note that we take the exception at the NEXT floating point instruction. 485 if (pc[0] == 0xDB) { 486 assert(pc[0] == 0xDB, "not a FIST opcode"); 487 assert(pc[1] == 0x14, "not a FIST opcode"); 488 assert(pc[2] == 0x24, "not a FIST opcode"); 489 return true; 490 } else { 491 assert(pc[-3] == 0xDB, "not an flt invalid opcode"); 492 assert(pc[-2] == 0x14, "not an flt invalid opcode"); 493 assert(pc[-1] == 0x24, "not an flt invalid opcode"); 494 } 495 } 496 else if (sig == SIGFPE ) { 497 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code); 498 } 499 #endif // !AMD64 500 501 // QQQ It doesn't seem that we need to do this on x86 because we should be able 502 // to return properly from the handler without this extra stuff on the back side. 503 504 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { 505 // Determination of interpreter/vtable stub/compiled code null exception 506 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 507 } 508 } 509 510 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 511 // and the heap gets shrunk before the field access. 512 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 513 address addr = JNI_FastGetField::find_slowcase_pc(pc); 514 if (addr != (address)-1) { 515 stub = addr; 516 } 517 } 518 519 // Check to see if we caught the safepoint code in the 520 // process of write protecting the memory serialization page. 521 // It write enables the page immediately after protecting it 522 // so we can just return to retry the write. 523 if ((sig == SIGSEGV) && 524 os::is_memory_serialize_page(thread, (address)info->si_addr)) { 525 // Block current thread until the memory serialize page permission restored. 526 os::block_on_serialize_page_trap(); 527 return true; 528 } 529 } 530 531 // Execution protection violation 532 // 533 // Preventative code for future versions of Solaris which may 534 // enable execution protection when running the 32-bit VM on AMD64. 535 // 536 // This should be kept as the last step in the triage. We don't 537 // have a dedicated trap number for a no-execute fault, so be 538 // conservative and allow other handlers the first shot. 539 // 540 // Note: We don't test that info->si_code == SEGV_ACCERR here. 541 // this si_code is so generic that it is almost meaningless; and 542 // the si_code for this condition may change in the future. 543 // Furthermore, a false-positive should be harmless. 544 if (UnguardOnExecutionViolation > 0 && 545 (sig == SIGSEGV || sig == SIGBUS) && 546 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault 547 int page_size = os::vm_page_size(); 548 address addr = (address) info->si_addr; 549 address pc = (address) uc->uc_mcontext.gregs[REG_PC]; 550 // Make sure the pc and the faulting address are sane. 551 // 552 // If an instruction spans a page boundary, and the page containing 553 // the beginning of the instruction is executable but the following 554 // page is not, the pc and the faulting address might be slightly 555 // different - we still want to unguard the 2nd page in this case. 556 // 557 // 15 bytes seems to be a (very) safe value for max instruction size. 558 bool pc_is_near_addr = 559 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 560 bool instr_spans_page_boundary = 561 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 562 (intptr_t) page_size) > 0); 563 564 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 565 static volatile address last_addr = 566 (address) os::non_memory_address_word(); 567 568 // In conservative mode, don't unguard unless the address is in the VM 569 if (addr != last_addr && 570 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 571 572 // Make memory rwx and retry 573 address page_start = 574 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 575 bool res = os::protect_memory((char*) page_start, page_size, 576 os::MEM_PROT_RWX); 577 578 if (PrintMiscellaneous && Verbose) { 579 char buf[256]; 580 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 581 "at " INTPTR_FORMAT 582 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, 583 page_start, (res ? "success" : "failed"), errno); 584 tty->print_raw_cr(buf); 585 } 586 stub = pc; 587 588 // Set last_addr so if we fault again at the same address, we don't end 589 // up in an endless loop. 590 // 591 // There are two potential complications here. Two threads trapping at 592 // the same address at the same time could cause one of the threads to 593 // think it already unguarded, and abort the VM. Likely very rare. 594 // 595 // The other race involves two threads alternately trapping at 596 // different addresses and failing to unguard the page, resulting in 597 // an endless loop. This condition is probably even more unlikely than 598 // the first. 599 // 600 // Although both cases could be avoided by using locks or thread local 601 // last_addr, these solutions are unnecessary complication: this 602 // handler is a best-effort safety net, not a complete solution. It is 603 // disabled by default and should only be used as a workaround in case 604 // we missed any no-execute-unsafe VM code. 605 606 last_addr = addr; 607 } 608 } 609 } 610 611 if (stub != NULL) { 612 // save all thread context in case we need to restore it 613 614 if (thread != NULL) thread->set_saved_exception_pc(pc); 615 // 12/02/99: On Sparc it appears that the full context is also saved 616 // but as yet, no one looks at or restores that saved context 617 // factor me: setPC 618 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub; 619 return true; 620 } 621 622 // signal-chaining 623 if (os::Solaris::chained_handler(sig, info, ucVoid)) { 624 return true; 625 } 626 627 #ifndef AMD64 628 // Workaround (bug 4900493) for Solaris kernel bug 4966651. 629 // Handle an undefined selector caused by an attempt to assign 630 // fs in libthread getipriptr(). With the current libthread design every 512 631 // thread creations the LDT for a private thread data structure is extended 632 // and thre is a hazard that and another thread attempting a thread creation 633 // will use a stale LDTR that doesn't reflect the structure's growth, 634 // causing a GP fault. 635 // Enforce the probable limit of passes through here to guard against an 636 // infinite loop if some other move to fs caused the GP fault. Note that 637 // this loop counter is ultimately a heuristic as it is possible for 638 // more than one thread to generate this fault at a time in an MP system. 639 // In the case of the loop count being exceeded or if the poll fails 640 // just fall through to a fatal error. 641 // If there is some other source of T_GPFLT traps and the text at EIP is 642 // unreadable this code will loop infinitely until the stack is exausted. 643 // The key to diagnosis in this case is to look for the bottom signal handler 644 // frame. 645 646 if(! IgnoreLibthreadGPFault) { 647 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) { 648 const unsigned char *p = 649 (unsigned const char *) uc->uc_mcontext.gregs[EIP]; 650 651 // Expected instruction? 652 653 if(p[0] == movlfs[0] && p[1] == movlfs[1]) { 654 655 Atomic::inc(&ldtr_refresh); 656 657 // Infinite loop? 658 659 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) { 660 661 // No, force scheduling to get a fresh view of the LDTR 662 663 if(poll(NULL, 0, 10) == 0) { 664 665 // Retry the move 666 667 return false; 668 } 669 } 670 } 671 } 672 } 673 #endif // !AMD64 674 675 if (!abort_if_unrecognized) { 676 // caller wants another chance, so give it to him 677 return false; 678 } 679 680 if (!os::Solaris::libjsig_is_loaded) { 681 struct sigaction oldAct; 682 sigaction(sig, (struct sigaction *)0, &oldAct); 683 if (oldAct.sa_sigaction != signalHandler) { 684 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 685 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 686 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand); 687 } 688 } 689 690 if (pc == NULL && uc != NULL) { 691 pc = (address) uc->uc_mcontext.gregs[REG_PC]; 692 } 693 694 // unmask current signal 695 sigset_t newset; 696 sigemptyset(&newset); 697 sigaddset(&newset, sig); 698 sigprocmask(SIG_UNBLOCK, &newset, NULL); 699 700 // Determine which sort of error to throw. Out of swap may signal 701 // on the thread stack, which could get a mapping error when touched. 702 address addr = (address) info->si_addr; 703 if (sig == SIGBUS && info->si_code == BUS_OBJERR && info->si_errno == ENOMEM) { 704 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "Out of swap space to map in thread stack."); 705 } 706 707 VMError err(t, sig, pc, info, ucVoid); 708 err.report_and_die(); 709 710 ShouldNotReachHere(); 711 return false; 712 } 713 714 void os::print_context(outputStream *st, void *context) { 715 if (context == NULL) return; 716 717 ucontext_t *uc = (ucontext_t*)context; 718 st->print_cr("Registers:"); 719 #ifdef AMD64 720 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); 721 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); 722 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); 723 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); 724 st->cr(); 725 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); 726 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); 727 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); 728 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); 729 st->cr(); 730 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); 731 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); 732 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); 733 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); 734 st->cr(); 735 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); 736 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); 737 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); 738 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); 739 st->cr(); 740 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); 741 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]); 742 #else 743 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]); 744 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]); 745 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]); 746 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]); 747 st->cr(); 748 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]); 749 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]); 750 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]); 751 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]); 752 st->cr(); 753 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]); 754 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]); 755 #endif // AMD64 756 st->cr(); 757 st->cr(); 758 759 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc); 760 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 761 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); 762 st->cr(); 763 764 // Note: it may be unsafe to inspect memory near pc. For example, pc may 765 // point to garbage if entry point in an nmethod is corrupted. Leave 766 // this at the end, and hope for the best. 767 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc); 768 address pc = epc.pc(); 769 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); 770 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 771 } 772 773 void os::print_register_info(outputStream *st, void *context) { 774 if (context == NULL) return; 775 776 ucontext_t *uc = (ucontext_t*)context; 777 778 st->print_cr("Register to memory mapping:"); 779 st->cr(); 780 781 // this is horrendously verbose but the layout of the registers in the 782 // context does not match how we defined our abstract Register set, so 783 // we can't just iterate through the gregs area 784 785 // this is only for the "general purpose" registers 786 787 #ifdef AMD64 788 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); 789 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); 790 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); 791 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); 792 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); 793 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); 794 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); 795 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); 796 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); 797 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); 798 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); 799 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); 800 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); 801 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); 802 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); 803 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); 804 #else 805 st->print("EAX="); print_location(st, uc->uc_mcontext.gregs[EAX]); 806 st->print("EBX="); print_location(st, uc->uc_mcontext.gregs[EBX]); 807 st->print("ECX="); print_location(st, uc->uc_mcontext.gregs[ECX]); 808 st->print("EDX="); print_location(st, uc->uc_mcontext.gregs[EDX]); 809 st->print("ESP="); print_location(st, uc->uc_mcontext.gregs[UESP]); 810 st->print("EBP="); print_location(st, uc->uc_mcontext.gregs[EBP]); 811 st->print("ESI="); print_location(st, uc->uc_mcontext.gregs[ESI]); 812 st->print("EDI="); print_location(st, uc->uc_mcontext.gregs[EDI]); 813 #endif 814 815 st->cr(); 816 } 817 818 819 #ifdef AMD64 820 void os::Solaris::init_thread_fpu_state(void) { 821 // Nothing to do 822 } 823 #else 824 // From solaris_i486.s 825 extern "C" void fixcw(); 826 827 void os::Solaris::init_thread_fpu_state(void) { 828 // Set fpu to 53 bit precision. This happens too early to use a stub. 829 fixcw(); 830 } 831 832 // These routines are the initial value of atomic_xchg_entry(), 833 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry() 834 // until initialization is complete. 835 // TODO - replace with .il implementation when compiler supports it. 836 837 typedef jint xchg_func_t (jint, volatile jint*); 838 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); 839 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong); 840 typedef jint add_func_t (jint, volatile jint*); 841 842 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { 843 // try to use the stub: 844 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); 845 846 if (func != NULL) { 847 os::atomic_xchg_func = func; 848 return (*func)(exchange_value, dest); 849 } 850 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 851 852 jint old_value = *dest; 853 *dest = exchange_value; 854 return old_value; 855 } 856 857 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { 858 // try to use the stub: 859 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); 860 861 if (func != NULL) { 862 os::atomic_cmpxchg_func = func; 863 return (*func)(exchange_value, dest, compare_value); 864 } 865 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 866 867 jint old_value = *dest; 868 if (old_value == compare_value) 869 *dest = exchange_value; 870 return old_value; 871 } 872 873 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { 874 // try to use the stub: 875 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); 876 877 if (func != NULL) { 878 os::atomic_cmpxchg_long_func = func; 879 return (*func)(exchange_value, dest, compare_value); 880 } 881 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 882 883 jlong old_value = *dest; 884 if (old_value == compare_value) 885 *dest = exchange_value; 886 return old_value; 887 } 888 889 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { 890 // try to use the stub: 891 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); 892 893 if (func != NULL) { 894 os::atomic_add_func = func; 895 return (*func)(add_value, dest); 896 } 897 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 898 899 return (*dest) += add_value; 900 } 901 902 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; 903 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; 904 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; 905 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; 906 907 extern "C" void _solaris_raw_setup_fpu(address ptr); 908 void os::setup_fpu() { 909 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); 910 _solaris_raw_setup_fpu(fpu_cntrl); 911 } 912 #endif // AMD64 913 914 #ifndef PRODUCT 915 void os::verify_stack_alignment() { 916 #ifdef AMD64 917 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 918 #endif 919 } 920 #endif 921 922 int os::extra_bang_size_in_bytes() { 923 // JDK-8050147 requires the full cache line bang for x86. 924 return VM_Version::L1_line_size(); 925 }