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 void os::Solaris::ucontext_set_pc(ucontext_t* uc, address pc) { 178 uc->uc_mcontext.gregs [REG_PC] = (greg_t) pc; 179 } 180 181 // Assumes ucontext is valid 182 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) { 183 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; 184 } 185 186 // Assumes ucontext is valid 187 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) { 188 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; 189 } 190 191 address os::Solaris::ucontext_get_pc(ucontext_t *uc) { 192 return (address) uc->uc_mcontext.gregs[REG_PC]; 193 } 194 195 // For Forte Analyzer AsyncGetCallTrace profiling support - thread 196 // is currently interrupted by SIGPROF. 197 // 198 // The difference between this and os::fetch_frame_from_context() is that 199 // here we try to skip nested signal frames. 200 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread, 201 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { 202 203 assert(thread != NULL, "just checking"); 204 assert(ret_sp != NULL, "just checking"); 205 assert(ret_fp != NULL, "just checking"); 206 207 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc); 208 return os::fetch_frame_from_context(luc, ret_sp, ret_fp); 209 } 210 211 ExtendedPC os::fetch_frame_from_context(void* ucVoid, 212 intptr_t** ret_sp, intptr_t** ret_fp) { 213 214 ExtendedPC epc; 215 ucontext_t *uc = (ucontext_t*)ucVoid; 216 217 if (uc != NULL) { 218 epc = os::Solaris::ucontext_get_ExtendedPC(uc); 219 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc); 220 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc); 221 } else { 222 // construct empty ExtendedPC for return value checking 223 epc = ExtendedPC(NULL); 224 if (ret_sp) *ret_sp = (intptr_t *)NULL; 225 if (ret_fp) *ret_fp = (intptr_t *)NULL; 226 } 227 228 return epc; 229 } 230 231 frame os::fetch_frame_from_context(void* ucVoid) { 232 intptr_t* sp; 233 intptr_t* fp; 234 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 235 return frame(sp, fp, epc.pc()); 236 } 237 238 frame os::get_sender_for_C_frame(frame* fr) { 239 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 240 } 241 242 extern "C" intptr_t *_get_current_sp(); // in .il file 243 244 address os::current_stack_pointer() { 245 return (address)_get_current_sp(); 246 } 247 248 extern "C" intptr_t *_get_current_fp(); // in .il file 249 250 frame os::current_frame() { 251 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp 252 frame myframe((intptr_t*)os::current_stack_pointer(), 253 (intptr_t*)fp, 254 CAST_FROM_FN_PTR(address, os::current_frame)); 255 if (os::is_first_C_frame(&myframe)) { 256 // stack is not walkable 257 frame ret; // This will be a null useless frame 258 return ret; 259 } else { 260 return os::get_sender_for_C_frame(&myframe); 261 } 262 } 263 264 #ifndef AMD64 265 266 // Detecting SSE support by OS 267 // From solaris_i486.s 268 extern "C" bool sse_check(); 269 extern "C" bool sse_unavailable(); 270 271 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED}; 272 static int sse_status = SSE_UNKNOWN; 273 274 275 static void check_for_sse_support() { 276 if (!VM_Version::supports_sse()) { 277 sse_status = SSE_NOT_SUPPORTED; 278 return; 279 } 280 // looking for _sse_hw in libc.so, if it does not exist or 281 // the value (int) is 0, OS has no support for SSE 282 int *sse_hwp; 283 void *h; 284 285 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) { 286 //open failed, presume no support for SSE 287 sse_status = SSE_NOT_SUPPORTED; 288 return; 289 } 290 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) { 291 sse_status = SSE_NOT_SUPPORTED; 292 } else if (*sse_hwp == 0) { 293 sse_status = SSE_NOT_SUPPORTED; 294 } 295 dlclose(h); 296 297 if (sse_status == SSE_UNKNOWN) { 298 bool (*try_sse)() = (bool (*)())sse_check; 299 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED; 300 } 301 302 } 303 304 #endif // AMD64 305 306 bool os::supports_sse() { 307 #ifdef AMD64 308 return true; 309 #else 310 if (sse_status == SSE_UNKNOWN) 311 check_for_sse_support(); 312 return sse_status == SSE_SUPPORTED; 313 #endif // AMD64 314 } 315 316 bool os::is_allocatable(size_t bytes) { 317 #ifdef AMD64 318 return true; 319 #else 320 321 if (bytes < 2 * G) { 322 return true; 323 } 324 325 char* addr = reserve_memory(bytes, NULL); 326 327 if (addr != NULL) { 328 release_memory(addr, bytes); 329 } 330 331 return addr != NULL; 332 #endif // AMD64 333 334 } 335 336 extern "C" JNIEXPORT int 337 JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, 338 int abort_if_unrecognized) { 339 ucontext_t* uc = (ucontext_t*) ucVoid; 340 341 #ifndef AMD64 342 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) { 343 // the SSE instruction faulted. supports_sse() need return false. 344 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable; 345 return true; 346 } 347 #endif // !AMD64 348 349 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 350 351 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 352 // (no destructors can be run) 353 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 354 355 SignalHandlerMark shm(t); 356 357 if(sig == SIGPIPE || sig == SIGXFSZ) { 358 if (os::Solaris::chained_handler(sig, info, ucVoid)) { 359 return true; 360 } else { 361 if (PrintMiscellaneous && (WizardMode || Verbose)) { 362 char buf[64]; 363 warning("Ignoring %s - see 4229104 or 6499219", 364 os::exception_name(sig, buf, sizeof(buf))); 365 366 } 367 return true; 368 } 369 } 370 371 JavaThread* thread = NULL; 372 VMThread* vmthread = NULL; 373 374 if (os::Solaris::signal_handlers_are_installed) { 375 if (t != NULL ){ 376 if(t->is_Java_thread()) { 377 thread = (JavaThread*)t; 378 } 379 else if(t->is_VM_thread()){ 380 vmthread = (VMThread *)t; 381 } 382 } 383 } 384 385 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs"); 386 387 if (sig == os::Solaris::SIGasync()) { 388 if(thread || vmthread){ 389 OSThread::SR_handler(t, uc); 390 return true; 391 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) { 392 return true; 393 } else { 394 // If os::Solaris::SIGasync not chained, and this is a non-vm and 395 // non-java thread 396 return true; 397 } 398 } 399 400 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { 401 // can't decode this kind of signal 402 info = NULL; 403 } else { 404 assert(sig == info->si_signo, "bad siginfo"); 405 } 406 407 // decide if this trap can be handled by a stub 408 address stub = NULL; 409 410 address pc = NULL; 411 412 //%note os_trap_1 413 if (info != NULL && uc != NULL && thread != NULL) { 414 // factor me: getPCfromContext 415 pc = (address) uc->uc_mcontext.gregs[REG_PC]; 416 417 if (StubRoutines::is_safefetch_fault(pc)) { 418 os::Solaris::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 419 return true; 420 } 421 422 // Handle ALL stack overflow variations here 423 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) { 424 address addr = (address) info->si_addr; 425 if (thread->in_stack_yellow_zone(addr)) { 426 thread->disable_stack_yellow_zone(); 427 if (thread->thread_state() == _thread_in_Java) { 428 // Throw a stack overflow exception. Guard pages will be reenabled 429 // while unwinding the stack. 430 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 431 } else { 432 // Thread was in the vm or native code. Return and try to finish. 433 return true; 434 } 435 } else if (thread->in_stack_red_zone(addr)) { 436 // Fatal red zone violation. Disable the guard pages and fall through 437 // to handle_unexpected_exception way down below. 438 thread->disable_stack_red_zone(); 439 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 440 } 441 } 442 443 if ((sig == SIGSEGV) && VM_Version::is_cpuinfo_segv_addr(pc)) { 444 // Verify that OS save/restore AVX registers. 445 stub = VM_Version::cpuinfo_cont_addr(); 446 } 447 448 if (thread->thread_state() == _thread_in_vm) { 449 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) { 450 stub = StubRoutines::handler_for_unsafe_access(); 451 } 452 } 453 454 if (thread->thread_state() == _thread_in_Java) { 455 // Support Safepoint Polling 456 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { 457 stub = SharedRuntime::get_poll_stub(pc); 458 } 459 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) { 460 // BugId 4454115: A read from a MappedByteBuffer can fault 461 // here if the underlying file has been truncated. 462 // Do not crash the VM in such a case. 463 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 464 if (cb != NULL) { 465 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; 466 if (nm != NULL && nm->has_unsafe_access()) { 467 stub = StubRoutines::handler_for_unsafe_access(); 468 } 469 } 470 } 471 else 472 if (sig == SIGFPE && info->si_code == FPE_INTDIV) { 473 // integer divide by zero 474 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 475 } 476 #ifndef AMD64 477 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) { 478 // floating-point divide by zero 479 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 480 } 481 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) { 482 // The encoding of D2I in i486.ad can cause an exception prior 483 // to the fist instruction if there was an invalid operation 484 // pending. We want to dismiss that exception. From the win_32 485 // side it also seems that if it really was the fist causing 486 // the exception that we do the d2i by hand with different 487 // rounding. Seems kind of weird. QQQ TODO 488 // Note that we take the exception at the NEXT floating point instruction. 489 if (pc[0] == 0xDB) { 490 assert(pc[0] == 0xDB, "not a FIST opcode"); 491 assert(pc[1] == 0x14, "not a FIST opcode"); 492 assert(pc[2] == 0x24, "not a FIST opcode"); 493 return true; 494 } else { 495 assert(pc[-3] == 0xDB, "not an flt invalid opcode"); 496 assert(pc[-2] == 0x14, "not an flt invalid opcode"); 497 assert(pc[-1] == 0x24, "not an flt invalid opcode"); 498 } 499 } 500 else if (sig == SIGFPE ) { 501 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code); 502 } 503 #endif // !AMD64 504 505 // QQQ It doesn't seem that we need to do this on x86 because we should be able 506 // to return properly from the handler without this extra stuff on the back side. 507 508 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { 509 // Determination of interpreter/vtable stub/compiled code null exception 510 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 511 } 512 } 513 514 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 515 // and the heap gets shrunk before the field access. 516 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 517 address addr = JNI_FastGetField::find_slowcase_pc(pc); 518 if (addr != (address)-1) { 519 stub = addr; 520 } 521 } 522 523 // Check to see if we caught the safepoint code in the 524 // process of write protecting the memory serialization page. 525 // It write enables the page immediately after protecting it 526 // so we can just return to retry the write. 527 if ((sig == SIGSEGV) && 528 os::is_memory_serialize_page(thread, (address)info->si_addr)) { 529 // Block current thread until the memory serialize page permission restored. 530 os::block_on_serialize_page_trap(); 531 return true; 532 } 533 } 534 535 // Execution protection violation 536 // 537 // Preventative code for future versions of Solaris which may 538 // enable execution protection when running the 32-bit VM on AMD64. 539 // 540 // This should be kept as the last step in the triage. We don't 541 // have a dedicated trap number for a no-execute fault, so be 542 // conservative and allow other handlers the first shot. 543 // 544 // Note: We don't test that info->si_code == SEGV_ACCERR here. 545 // this si_code is so generic that it is almost meaningless; and 546 // the si_code for this condition may change in the future. 547 // Furthermore, a false-positive should be harmless. 548 if (UnguardOnExecutionViolation > 0 && 549 (sig == SIGSEGV || sig == SIGBUS) && 550 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault 551 int page_size = os::vm_page_size(); 552 address addr = (address) info->si_addr; 553 address pc = (address) uc->uc_mcontext.gregs[REG_PC]; 554 // Make sure the pc and the faulting address are sane. 555 // 556 // If an instruction spans a page boundary, and the page containing 557 // the beginning of the instruction is executable but the following 558 // page is not, the pc and the faulting address might be slightly 559 // different - we still want to unguard the 2nd page in this case. 560 // 561 // 15 bytes seems to be a (very) safe value for max instruction size. 562 bool pc_is_near_addr = 563 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 564 bool instr_spans_page_boundary = 565 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 566 (intptr_t) page_size) > 0); 567 568 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 569 static volatile address last_addr = 570 (address) os::non_memory_address_word(); 571 572 // In conservative mode, don't unguard unless the address is in the VM 573 if (addr != last_addr && 574 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 575 576 // Make memory rwx and retry 577 address page_start = 578 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 579 bool res = os::protect_memory((char*) page_start, page_size, 580 os::MEM_PROT_RWX); 581 582 if (PrintMiscellaneous && Verbose) { 583 char buf[256]; 584 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 585 "at " INTPTR_FORMAT 586 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, 587 page_start, (res ? "success" : "failed"), errno); 588 tty->print_raw_cr(buf); 589 } 590 stub = pc; 591 592 // Set last_addr so if we fault again at the same address, we don't end 593 // up in an endless loop. 594 // 595 // There are two potential complications here. Two threads trapping at 596 // the same address at the same time could cause one of the threads to 597 // think it already unguarded, and abort the VM. Likely very rare. 598 // 599 // The other race involves two threads alternately trapping at 600 // different addresses and failing to unguard the page, resulting in 601 // an endless loop. This condition is probably even more unlikely than 602 // the first. 603 // 604 // Although both cases could be avoided by using locks or thread local 605 // last_addr, these solutions are unnecessary complication: this 606 // handler is a best-effort safety net, not a complete solution. It is 607 // disabled by default and should only be used as a workaround in case 608 // we missed any no-execute-unsafe VM code. 609 610 last_addr = addr; 611 } 612 } 613 } 614 615 if (stub != NULL) { 616 // save all thread context in case we need to restore it 617 618 if (thread != NULL) thread->set_saved_exception_pc(pc); 619 // 12/02/99: On Sparc it appears that the full context is also saved 620 // but as yet, no one looks at or restores that saved context 621 os::Solaris::ucontext_set_pc(uc, stub); 622 return true; 623 } 624 625 // signal-chaining 626 if (os::Solaris::chained_handler(sig, info, ucVoid)) { 627 return true; 628 } 629 630 #ifndef AMD64 631 // Workaround (bug 4900493) for Solaris kernel bug 4966651. 632 // Handle an undefined selector caused by an attempt to assign 633 // fs in libthread getipriptr(). With the current libthread design every 512 634 // thread creations the LDT for a private thread data structure is extended 635 // and thre is a hazard that and another thread attempting a thread creation 636 // will use a stale LDTR that doesn't reflect the structure's growth, 637 // causing a GP fault. 638 // Enforce the probable limit of passes through here to guard against an 639 // infinite loop if some other move to fs caused the GP fault. Note that 640 // this loop counter is ultimately a heuristic as it is possible for 641 // more than one thread to generate this fault at a time in an MP system. 642 // In the case of the loop count being exceeded or if the poll fails 643 // just fall through to a fatal error. 644 // If there is some other source of T_GPFLT traps and the text at EIP is 645 // unreadable this code will loop infinitely until the stack is exausted. 646 // The key to diagnosis in this case is to look for the bottom signal handler 647 // frame. 648 649 if(! IgnoreLibthreadGPFault) { 650 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) { 651 const unsigned char *p = 652 (unsigned const char *) uc->uc_mcontext.gregs[EIP]; 653 654 // Expected instruction? 655 656 if(p[0] == movlfs[0] && p[1] == movlfs[1]) { 657 658 Atomic::inc(&ldtr_refresh); 659 660 // Infinite loop? 661 662 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) { 663 664 // No, force scheduling to get a fresh view of the LDTR 665 666 if(poll(NULL, 0, 10) == 0) { 667 668 // Retry the move 669 670 return false; 671 } 672 } 673 } 674 } 675 } 676 #endif // !AMD64 677 678 if (!abort_if_unrecognized) { 679 // caller wants another chance, so give it to him 680 return false; 681 } 682 683 if (!os::Solaris::libjsig_is_loaded) { 684 struct sigaction oldAct; 685 sigaction(sig, (struct sigaction *)0, &oldAct); 686 if (oldAct.sa_sigaction != signalHandler) { 687 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 688 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 689 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand); 690 } 691 } 692 693 if (pc == NULL && uc != NULL) { 694 pc = (address) uc->uc_mcontext.gregs[REG_PC]; 695 } 696 697 // unmask current signal 698 sigset_t newset; 699 sigemptyset(&newset); 700 sigaddset(&newset, sig); 701 sigprocmask(SIG_UNBLOCK, &newset, NULL); 702 703 // Determine which sort of error to throw. Out of swap may signal 704 // on the thread stack, which could get a mapping error when touched. 705 address addr = (address) info->si_addr; 706 if (sig == SIGBUS && info->si_code == BUS_OBJERR && info->si_errno == ENOMEM) { 707 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "Out of swap space to map in thread stack."); 708 } 709 710 VMError::report_and_die(t, sig, pc, info, ucVoid); 711 712 ShouldNotReachHere(); 713 return false; 714 } 715 716 void os::print_context(outputStream *st, void *context) { 717 if (context == NULL) return; 718 719 ucontext_t *uc = (ucontext_t*)context; 720 st->print_cr("Registers:"); 721 #ifdef AMD64 722 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); 723 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); 724 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); 725 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); 726 st->cr(); 727 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); 728 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); 729 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); 730 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); 731 st->cr(); 732 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); 733 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); 734 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); 735 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); 736 st->cr(); 737 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); 738 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); 739 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); 740 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); 741 st->cr(); 742 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); 743 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]); 744 #else 745 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]); 746 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]); 747 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]); 748 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]); 749 st->cr(); 750 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]); 751 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]); 752 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]); 753 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]); 754 st->cr(); 755 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]); 756 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]); 757 #endif // AMD64 758 st->cr(); 759 st->cr(); 760 761 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc); 762 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 763 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); 764 st->cr(); 765 766 // Note: it may be unsafe to inspect memory near pc. For example, pc may 767 // point to garbage if entry point in an nmethod is corrupted. Leave 768 // this at the end, and hope for the best. 769 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc); 770 address pc = epc.pc(); 771 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); 772 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 773 } 774 775 void os::print_register_info(outputStream *st, void *context) { 776 if (context == NULL) return; 777 778 ucontext_t *uc = (ucontext_t*)context; 779 780 st->print_cr("Register to memory mapping:"); 781 st->cr(); 782 783 // this is horrendously verbose but the layout of the registers in the 784 // context does not match how we defined our abstract Register set, so 785 // we can't just iterate through the gregs area 786 787 // this is only for the "general purpose" registers 788 789 #ifdef AMD64 790 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); 791 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); 792 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); 793 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); 794 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); 795 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); 796 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); 797 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); 798 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); 799 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); 800 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); 801 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); 802 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); 803 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); 804 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); 805 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); 806 #else 807 st->print("EAX="); print_location(st, uc->uc_mcontext.gregs[EAX]); 808 st->print("EBX="); print_location(st, uc->uc_mcontext.gregs[EBX]); 809 st->print("ECX="); print_location(st, uc->uc_mcontext.gregs[ECX]); 810 st->print("EDX="); print_location(st, uc->uc_mcontext.gregs[EDX]); 811 st->print("ESP="); print_location(st, uc->uc_mcontext.gregs[UESP]); 812 st->print("EBP="); print_location(st, uc->uc_mcontext.gregs[EBP]); 813 st->print("ESI="); print_location(st, uc->uc_mcontext.gregs[ESI]); 814 st->print("EDI="); print_location(st, uc->uc_mcontext.gregs[EDI]); 815 #endif 816 817 st->cr(); 818 } 819 820 821 #ifdef AMD64 822 void os::Solaris::init_thread_fpu_state(void) { 823 // Nothing to do 824 } 825 #else 826 // From solaris_i486.s 827 extern "C" void fixcw(); 828 829 void os::Solaris::init_thread_fpu_state(void) { 830 // Set fpu to 53 bit precision. This happens too early to use a stub. 831 fixcw(); 832 } 833 834 // These routines are the initial value of atomic_xchg_entry(), 835 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry() 836 // until initialization is complete. 837 // TODO - replace with .il implementation when compiler supports it. 838 839 typedef jint xchg_func_t (jint, volatile jint*); 840 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); 841 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong); 842 typedef jint add_func_t (jint, volatile jint*); 843 844 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { 845 // try to use the stub: 846 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); 847 848 if (func != NULL) { 849 os::atomic_xchg_func = func; 850 return (*func)(exchange_value, dest); 851 } 852 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 853 854 jint old_value = *dest; 855 *dest = exchange_value; 856 return old_value; 857 } 858 859 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { 860 // try to use the stub: 861 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); 862 863 if (func != NULL) { 864 os::atomic_cmpxchg_func = func; 865 return (*func)(exchange_value, dest, compare_value); 866 } 867 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 868 869 jint old_value = *dest; 870 if (old_value == compare_value) 871 *dest = exchange_value; 872 return old_value; 873 } 874 875 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { 876 // try to use the stub: 877 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); 878 879 if (func != NULL) { 880 os::atomic_cmpxchg_long_func = func; 881 return (*func)(exchange_value, dest, compare_value); 882 } 883 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 884 885 jlong old_value = *dest; 886 if (old_value == compare_value) 887 *dest = exchange_value; 888 return old_value; 889 } 890 891 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { 892 // try to use the stub: 893 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); 894 895 if (func != NULL) { 896 os::atomic_add_func = func; 897 return (*func)(add_value, dest); 898 } 899 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 900 901 return (*dest) += add_value; 902 } 903 904 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; 905 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; 906 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; 907 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; 908 909 extern "C" void _solaris_raw_setup_fpu(address ptr); 910 void os::setup_fpu() { 911 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); 912 _solaris_raw_setup_fpu(fpu_cntrl); 913 } 914 #endif // AMD64 915 916 #ifndef PRODUCT 917 void os::verify_stack_alignment() { 918 #ifdef AMD64 919 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 920 #endif 921 } 922 #endif 923 924 int os::extra_bang_size_in_bytes() { 925 // JDK-8050147 requires the full cache line bang for x86. 926 return VM_Version::L1_line_size(); 927 }