1 /* 2 * Copyright (c) 1999, 2017, 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 "jvm.h" 27 #include "asm/macroAssembler.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "code/codeCache.hpp" 32 #include "code/icBuffer.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "logging/log.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "os_share_solaris.hpp" 38 #include "prims/jniFastGetField.hpp" 39 #include "prims/jvm_misc.hpp" 40 #include "runtime/arguments.hpp" 41 #include "runtime/atomic.hpp" 42 #include "runtime/extendedPC.hpp" 43 #include "runtime/frame.inline.hpp" 44 #include "runtime/interfaceSupport.inline.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/align.hpp" 54 #include "utilities/events.hpp" 55 #include "utilities/vmError.hpp" 56 57 // put OS-includes here 58 # include <sys/types.h> 59 # include <sys/mman.h> 60 # include <pthread.h> 61 # include <signal.h> 62 # include <setjmp.h> 63 # include <errno.h> 64 # include <dlfcn.h> 65 # include <stdio.h> 66 # include <unistd.h> 67 # include <sys/resource.h> 68 # include <thread.h> 69 # include <sys/stat.h> 70 # include <sys/time.h> 71 # include <sys/filio.h> 72 # include <sys/utsname.h> 73 # include <sys/systeminfo.h> 74 # include <sys/socket.h> 75 # include <sys/trap.h> 76 # include <sys/lwp.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 usable stack sizes required to get to user code. Space for 91 // HotSpot guard pages is added later. 92 #ifdef _LP64 93 // The adlc generated method 'State::MachNodeGenerator(int)' used by the C2 compiler 94 // threads requires a large stack with the Solaris Studio C++ compiler version 5.13 95 // and product VM builds (debug builds require significantly less stack space). 96 size_t os::Posix::_compiler_thread_min_stack_allowed = 325 * K; 97 size_t os::Posix::_java_thread_min_stack_allowed = 48 * K; 98 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 224 * K; 99 #else 100 size_t os::Posix::_compiler_thread_min_stack_allowed = 32 * K; 101 size_t os::Posix::_java_thread_min_stack_allowed = 32 * K; 102 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K; 103 #endif // _LP64 104 105 #ifdef AMD64 106 #define REG_SP REG_RSP 107 #define REG_PC REG_RIP 108 #define REG_FP REG_RBP 109 #else 110 #define REG_SP UESP 111 #define REG_PC EIP 112 #define REG_FP EBP 113 // 4900493 counter to prevent runaway LDTR refresh attempt 114 115 static volatile int ldtr_refresh = 0; 116 // the libthread instruction that faults because of the stale LDTR 117 118 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs 119 }; 120 #endif // AMD64 121 122 char* os::non_memory_address_word() { 123 // Must never look like an address returned by reserve_memory, 124 // even in its subfields (as defined by the CPU immediate fields, 125 // if the CPU splits constants across multiple instructions). 126 return (char*) -1; 127 } 128 129 // 130 // Validate a ucontext retrieved from walking a uc_link of a ucontext. 131 // There are issues with libthread giving out uc_links for different threads 132 // on the same uc_link chain and bad or circular links. 133 // 134 bool os::Solaris::valid_ucontext(Thread* thread, const ucontext_t* valid, const ucontext_t* suspect) { 135 if (valid >= suspect || 136 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags || 137 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp || 138 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) { 139 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");) 140 return false; 141 } 142 143 if (thread->is_Java_thread()) { 144 if (!valid_stack_address(thread, (address)suspect)) { 145 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");) 146 return false; 147 } 148 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) { 149 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");) 150 return false; 151 } 152 } 153 return true; 154 } 155 156 // We will only follow one level of uc_link since there are libthread 157 // issues with ucontext linking and it is better to be safe and just 158 // let caller retry later. 159 const ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread, 160 const ucontext_t *uc) { 161 162 const ucontext_t *retuc = NULL; 163 164 if (uc != NULL) { 165 if (uc->uc_link == NULL) { 166 // cannot validate without uc_link so accept current ucontext 167 retuc = uc; 168 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { 169 // first ucontext is valid so try the next one 170 uc = uc->uc_link; 171 if (uc->uc_link == NULL) { 172 // cannot validate without uc_link so accept current ucontext 173 retuc = uc; 174 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { 175 // the ucontext one level down is also valid so return it 176 retuc = uc; 177 } 178 } 179 } 180 return retuc; 181 } 182 183 // Assumes ucontext is valid 184 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(const ucontext_t *uc) { 185 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]); 186 } 187 188 void os::Solaris::ucontext_set_pc(ucontext_t* uc, address pc) { 189 uc->uc_mcontext.gregs [REG_PC] = (greg_t) pc; 190 } 191 192 // Assumes ucontext is valid 193 intptr_t* os::Solaris::ucontext_get_sp(const ucontext_t *uc) { 194 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; 195 } 196 197 // Assumes ucontext is valid 198 intptr_t* os::Solaris::ucontext_get_fp(const ucontext_t *uc) { 199 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; 200 } 201 202 address os::Solaris::ucontext_get_pc(const ucontext_t *uc) { 203 return (address) uc->uc_mcontext.gregs[REG_PC]; 204 } 205 206 // For Forte Analyzer AsyncGetCallTrace profiling support - thread 207 // is currently interrupted by SIGPROF. 208 // 209 // The difference between this and os::fetch_frame_from_context() is that 210 // here we try to skip nested signal frames. 211 // This method is also used for stack overflow signal handling. 212 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread, 213 const ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { 214 215 assert(thread != NULL, "just checking"); 216 assert(ret_sp != NULL, "just checking"); 217 assert(ret_fp != NULL, "just checking"); 218 219 const ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc); 220 return os::fetch_frame_from_context(luc, ret_sp, ret_fp); 221 } 222 223 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 224 intptr_t** ret_sp, intptr_t** ret_fp) { 225 226 ExtendedPC epc; 227 const ucontext_t *uc = (const ucontext_t*)ucVoid; 228 229 if (uc != NULL) { 230 epc = os::Solaris::ucontext_get_ExtendedPC(uc); 231 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc); 232 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc); 233 } else { 234 // construct empty ExtendedPC for return value checking 235 epc = ExtendedPC(NULL); 236 if (ret_sp) *ret_sp = (intptr_t *)NULL; 237 if (ret_fp) *ret_fp = (intptr_t *)NULL; 238 } 239 240 return epc; 241 } 242 243 frame os::fetch_frame_from_context(const void* ucVoid) { 244 intptr_t* sp; 245 intptr_t* fp; 246 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 247 return frame(sp, fp, epc.pc()); 248 } 249 250 frame os::fetch_frame_from_ucontext(Thread* thread, void* ucVoid) { 251 intptr_t* sp; 252 intptr_t* fp; 253 ExtendedPC epc = os::Solaris::fetch_frame_from_ucontext(thread, (ucontext_t*)ucVoid, &sp, &fp); 254 return frame(sp, fp, epc.pc()); 255 } 256 257 bool os::Solaris::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { 258 address pc = (address) os::Solaris::ucontext_get_pc(uc); 259 if (Interpreter::contains(pc)) { 260 // interpreter performs stack banging after the fixed frame header has 261 // been generated while the compilers perform it before. To maintain 262 // semantic consistency between interpreted and compiled frames, the 263 // method returns the Java sender of the current frame. 264 *fr = os::fetch_frame_from_ucontext(thread, uc); 265 if (!fr->is_first_java_frame()) { 266 // get_frame_at_stack_banging_point() is only called when we 267 // have well defined stacks so java_sender() calls do not need 268 // to assert safe_for_sender() first. 269 *fr = fr->java_sender(); 270 } 271 } else { 272 // more complex code with compiled code 273 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 274 CodeBlob* cb = CodeCache::find_blob(pc); 275 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 276 // Not sure where the pc points to, fallback to default 277 // stack overflow handling 278 return false; 279 } else { 280 // in compiled code, the stack banging is performed just after the return pc 281 // has been pushed on the stack 282 intptr_t* fp = os::Solaris::ucontext_get_fp(uc); 283 intptr_t* sp = os::Solaris::ucontext_get_sp(uc); 284 *fr = frame(sp + 1, fp, (address)*sp); 285 if (!fr->is_java_frame()) { 286 // See java_sender() comment above. 287 *fr = fr->java_sender(); 288 } 289 } 290 } 291 assert(fr->is_java_frame(), "Safety check"); 292 return true; 293 } 294 295 frame os::get_sender_for_C_frame(frame* fr) { 296 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 297 } 298 299 extern "C" intptr_t *_get_current_sp(); // in .il file 300 301 address os::current_stack_pointer() { 302 return (address)_get_current_sp(); 303 } 304 305 extern "C" intptr_t *_get_current_fp(); // in .il file 306 307 frame os::current_frame() { 308 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp 309 // fp is for os::current_frame. We want the fp for our caller. 310 frame myframe((intptr_t*)os::current_stack_pointer(), 311 (intptr_t*)fp, 312 CAST_FROM_FN_PTR(address, os::current_frame)); 313 frame caller_frame = os::get_sender_for_C_frame(&myframe); 314 315 if (os::is_first_C_frame(&caller_frame)) { 316 // stack is not walkable 317 frame ret; // This will be a null useless frame 318 return ret; 319 } else { 320 // return frame for our caller's caller 321 return os::get_sender_for_C_frame(&caller_frame); 322 } 323 } 324 325 #ifndef AMD64 326 327 // Detecting SSE support by OS 328 // From solaris_i486.s 329 extern "C" bool sse_check(); 330 extern "C" bool sse_unavailable(); 331 332 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED}; 333 static int sse_status = SSE_UNKNOWN; 334 335 336 static void check_for_sse_support() { 337 if (!VM_Version::supports_sse()) { 338 sse_status = SSE_NOT_SUPPORTED; 339 return; 340 } 341 // looking for _sse_hw in libc.so, if it does not exist or 342 // the value (int) is 0, OS has no support for SSE 343 int *sse_hwp; 344 void *h; 345 346 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) { 347 //open failed, presume no support for SSE 348 sse_status = SSE_NOT_SUPPORTED; 349 return; 350 } 351 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) { 352 sse_status = SSE_NOT_SUPPORTED; 353 } else if (*sse_hwp == 0) { 354 sse_status = SSE_NOT_SUPPORTED; 355 } 356 dlclose(h); 357 358 if (sse_status == SSE_UNKNOWN) { 359 bool (*try_sse)() = (bool (*)())sse_check; 360 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED; 361 } 362 363 } 364 365 #endif // AMD64 366 367 bool os::supports_sse() { 368 #ifdef AMD64 369 return true; 370 #else 371 if (sse_status == SSE_UNKNOWN) 372 check_for_sse_support(); 373 return sse_status == SSE_SUPPORTED; 374 #endif // AMD64 375 } 376 377 bool os::is_allocatable(size_t bytes) { 378 #ifdef AMD64 379 return true; 380 #else 381 382 if (bytes < 2 * G) { 383 return true; 384 } 385 386 char* addr = reserve_memory(bytes, NULL); 387 388 if (addr != NULL) { 389 release_memory(addr, bytes); 390 } 391 392 return addr != NULL; 393 #endif // AMD64 394 395 } 396 397 extern "C" JNIEXPORT int 398 JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, 399 int abort_if_unrecognized) { 400 ucontext_t* uc = (ucontext_t*) ucVoid; 401 402 #ifndef AMD64 403 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) { 404 // the SSE instruction faulted. supports_sse() need return false. 405 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable; 406 return true; 407 } 408 #endif // !AMD64 409 410 Thread* t = Thread::current_or_null_safe(); 411 412 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 413 // (no destructors can be run) 414 os::ThreadCrashProtection::check_crash_protection(sig, t); 415 416 SignalHandlerMark shm(t); 417 418 if(sig == SIGPIPE || sig == SIGXFSZ) { 419 if (os::Solaris::chained_handler(sig, info, ucVoid)) { 420 return true; 421 } else { 422 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 423 return true; 424 } 425 } 426 427 JavaThread* thread = NULL; 428 VMThread* vmthread = NULL; 429 430 if (os::Solaris::signal_handlers_are_installed) { 431 if (t != NULL ){ 432 if(t->is_Java_thread()) { 433 thread = (JavaThread*)t; 434 } 435 else if(t->is_VM_thread()){ 436 vmthread = (VMThread *)t; 437 } 438 } 439 } 440 441 if (sig == ASYNC_SIGNAL) { 442 if(thread || vmthread){ 443 OSThread::SR_handler(t, uc); 444 return true; 445 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) { 446 return true; 447 } else { 448 // If ASYNC_SIGNAL not chained, and this is a non-vm and 449 // non-java thread 450 return true; 451 } 452 } 453 454 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { 455 // can't decode this kind of signal 456 info = NULL; 457 } else { 458 assert(sig == info->si_signo, "bad siginfo"); 459 } 460 461 // decide if this trap can be handled by a stub 462 address stub = NULL; 463 464 address pc = NULL; 465 466 //%note os_trap_1 467 if (info != NULL && uc != NULL && thread != NULL) { 468 // factor me: getPCfromContext 469 pc = (address) uc->uc_mcontext.gregs[REG_PC]; 470 471 if (StubRoutines::is_safefetch_fault(pc)) { 472 os::Solaris::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 473 return true; 474 } 475 476 // Handle ALL stack overflow variations here 477 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) { 478 address addr = (address) info->si_addr; 479 if (thread->in_stack_yellow_reserved_zone(addr)) { 480 if (thread->thread_state() == _thread_in_Java) { 481 if (thread->in_stack_reserved_zone(addr)) { 482 frame fr; 483 if (os::Solaris::get_frame_at_stack_banging_point(thread, uc, &fr)) { 484 assert(fr.is_java_frame(), "Must be Java frame"); 485 frame activation = SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 486 if (activation.sp() != NULL) { 487 thread->disable_stack_reserved_zone(); 488 if (activation.is_interpreted_frame()) { 489 thread->set_reserved_stack_activation((address)( 490 activation.fp() + frame::interpreter_frame_initial_sp_offset)); 491 } else { 492 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 493 } 494 return true; 495 } 496 } 497 } 498 // Throw a stack overflow exception. Guard pages will be reenabled 499 // while unwinding the stack. 500 thread->disable_stack_yellow_reserved_zone(); 501 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 502 } else { 503 // Thread was in the vm or native code. Return and try to finish. 504 thread->disable_stack_yellow_reserved_zone(); 505 return true; 506 } 507 } else if (thread->in_stack_red_zone(addr)) { 508 // Fatal red zone violation. Disable the guard pages and fall through 509 // to handle_unexpected_exception way down below. 510 thread->disable_stack_red_zone(); 511 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 512 } 513 } 514 515 if ((sig == SIGSEGV) && VM_Version::is_cpuinfo_segv_addr(pc)) { 516 // Verify that OS save/restore AVX registers. 517 stub = VM_Version::cpuinfo_cont_addr(); 518 } 519 520 if (thread->thread_state() == _thread_in_vm) { 521 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) { 522 address next_pc = Assembler::locate_next_instruction(pc); 523 stub = SharedRuntime::handle_unsafe_access(thread, next_pc); 524 } 525 } 526 527 if (thread->thread_state() == _thread_in_Java) { 528 // Support Safepoint Polling 529 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { 530 stub = SharedRuntime::get_poll_stub(pc); 531 } 532 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) { 533 // BugId 4454115: A read from a MappedByteBuffer can fault 534 // here if the underlying file has been truncated. 535 // Do not crash the VM in such a case. 536 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 537 if (cb != NULL) { 538 CompiledMethod* nm = cb->as_compiled_method_or_null(); 539 if (nm != NULL && nm->has_unsafe_access()) { 540 address next_pc = Assembler::locate_next_instruction(pc); 541 stub = SharedRuntime::handle_unsafe_access(thread, next_pc); 542 } 543 } 544 } 545 else 546 if (sig == SIGFPE && info->si_code == FPE_INTDIV) { 547 // integer divide by zero 548 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 549 } 550 #ifndef AMD64 551 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) { 552 // floating-point divide by zero 553 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 554 } 555 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) { 556 // The encoding of D2I in i486.ad can cause an exception prior 557 // to the fist instruction if there was an invalid operation 558 // pending. We want to dismiss that exception. From the win_32 559 // side it also seems that if it really was the fist causing 560 // the exception that we do the d2i by hand with different 561 // rounding. Seems kind of weird. QQQ TODO 562 // Note that we take the exception at the NEXT floating point instruction. 563 if (pc[0] == 0xDB) { 564 assert(pc[0] == 0xDB, "not a FIST opcode"); 565 assert(pc[1] == 0x14, "not a FIST opcode"); 566 assert(pc[2] == 0x24, "not a FIST opcode"); 567 return true; 568 } else { 569 assert(pc[-3] == 0xDB, "not an flt invalid opcode"); 570 assert(pc[-2] == 0x14, "not an flt invalid opcode"); 571 assert(pc[-1] == 0x24, "not an flt invalid opcode"); 572 } 573 } 574 else if (sig == SIGFPE ) { 575 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code); 576 } 577 #endif // !AMD64 578 579 // QQQ It doesn't seem that we need to do this on x86 because we should be able 580 // to return properly from the handler without this extra stuff on the back side. 581 582 else if (sig == SIGSEGV && info->si_code > 0 && 583 MacroAssembler::uses_implicit_null_check(info->si_addr)) { 584 // Determination of interpreter/vtable stub/compiled code null exception 585 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 586 } 587 } 588 589 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 590 // and the heap gets shrunk before the field access. 591 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 592 address addr = JNI_FastGetField::find_slowcase_pc(pc); 593 if (addr != (address)-1) { 594 stub = addr; 595 } 596 } 597 598 // Check to see if we caught the safepoint code in the 599 // process of write protecting the memory serialization page. 600 // It write enables the page immediately after protecting it 601 // so we can just return to retry the write. 602 if ((sig == SIGSEGV) && 603 os::is_memory_serialize_page(thread, (address)info->si_addr)) { 604 // Block current thread until the memory serialize page permission restored. 605 os::block_on_serialize_page_trap(); 606 return true; 607 } 608 } 609 610 // Execution protection violation 611 // 612 // Preventative code for future versions of Solaris which may 613 // enable execution protection when running the 32-bit VM on AMD64. 614 // 615 // This should be kept as the last step in the triage. We don't 616 // have a dedicated trap number for a no-execute fault, so be 617 // conservative and allow other handlers the first shot. 618 // 619 // Note: We don't test that info->si_code == SEGV_ACCERR here. 620 // this si_code is so generic that it is almost meaningless; and 621 // the si_code for this condition may change in the future. 622 // Furthermore, a false-positive should be harmless. 623 if (UnguardOnExecutionViolation > 0 && 624 (sig == SIGSEGV || sig == SIGBUS) && 625 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault 626 int page_size = os::vm_page_size(); 627 address addr = (address) info->si_addr; 628 address pc = (address) uc->uc_mcontext.gregs[REG_PC]; 629 // Make sure the pc and the faulting address are sane. 630 // 631 // If an instruction spans a page boundary, and the page containing 632 // the beginning of the instruction is executable but the following 633 // page is not, the pc and the faulting address might be slightly 634 // different - we still want to unguard the 2nd page in this case. 635 // 636 // 15 bytes seems to be a (very) safe value for max instruction size. 637 bool pc_is_near_addr = 638 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 639 bool instr_spans_page_boundary = 640 (align_down((intptr_t) pc ^ (intptr_t) addr, 641 (intptr_t) page_size) > 0); 642 643 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 644 static volatile address last_addr = 645 (address) os::non_memory_address_word(); 646 647 // In conservative mode, don't unguard unless the address is in the VM 648 if (addr != last_addr && 649 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 650 651 // Make memory rwx and retry 652 address page_start = align_down(addr, page_size); 653 bool res = os::protect_memory((char*) page_start, page_size, 654 os::MEM_PROT_RWX); 655 656 log_debug(os)("Execution protection violation " 657 "at " INTPTR_FORMAT 658 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", p2i(addr), 659 p2i(page_start), (res ? "success" : "failed"), errno); 660 stub = pc; 661 662 // Set last_addr so if we fault again at the same address, we don't end 663 // up in an endless loop. 664 // 665 // There are two potential complications here. Two threads trapping at 666 // the same address at the same time could cause one of the threads to 667 // think it already unguarded, and abort the VM. Likely very rare. 668 // 669 // The other race involves two threads alternately trapping at 670 // different addresses and failing to unguard the page, resulting in 671 // an endless loop. This condition is probably even more unlikely than 672 // the first. 673 // 674 // Although both cases could be avoided by using locks or thread local 675 // last_addr, these solutions are unnecessary complication: this 676 // handler is a best-effort safety net, not a complete solution. It is 677 // disabled by default and should only be used as a workaround in case 678 // we missed any no-execute-unsafe VM code. 679 680 last_addr = addr; 681 } 682 } 683 } 684 685 if (stub != NULL) { 686 // save all thread context in case we need to restore it 687 688 if (thread != NULL) thread->set_saved_exception_pc(pc); 689 // 12/02/99: On Sparc it appears that the full context is also saved 690 // but as yet, no one looks at or restores that saved context 691 os::Solaris::ucontext_set_pc(uc, stub); 692 return true; 693 } 694 695 // signal-chaining 696 if (os::Solaris::chained_handler(sig, info, ucVoid)) { 697 return true; 698 } 699 700 #ifndef AMD64 701 // Workaround (bug 4900493) for Solaris kernel bug 4966651. 702 // Handle an undefined selector caused by an attempt to assign 703 // fs in libthread getipriptr(). With the current libthread design every 512 704 // thread creations the LDT for a private thread data structure is extended 705 // and thre is a hazard that and another thread attempting a thread creation 706 // will use a stale LDTR that doesn't reflect the structure's growth, 707 // causing a GP fault. 708 // Enforce the probable limit of passes through here to guard against an 709 // infinite loop if some other move to fs caused the GP fault. Note that 710 // this loop counter is ultimately a heuristic as it is possible for 711 // more than one thread to generate this fault at a time in an MP system. 712 // In the case of the loop count being exceeded or if the poll fails 713 // just fall through to a fatal error. 714 // If there is some other source of T_GPFLT traps and the text at EIP is 715 // unreadable this code will loop infinitely until the stack is exausted. 716 // The key to diagnosis in this case is to look for the bottom signal handler 717 // frame. 718 719 if(! IgnoreLibthreadGPFault) { 720 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) { 721 const unsigned char *p = 722 (unsigned const char *) uc->uc_mcontext.gregs[EIP]; 723 724 // Expected instruction? 725 726 if(p[0] == movlfs[0] && p[1] == movlfs[1]) { 727 728 Atomic::inc(&ldtr_refresh); 729 730 // Infinite loop? 731 732 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) { 733 734 // No, force scheduling to get a fresh view of the LDTR 735 736 if(poll(NULL, 0, 10) == 0) { 737 738 // Retry the move 739 740 return false; 741 } 742 } 743 } 744 } 745 } 746 #endif // !AMD64 747 748 if (!abort_if_unrecognized) { 749 // caller wants another chance, so give it to him 750 return false; 751 } 752 753 if (!os::Solaris::libjsig_is_loaded) { 754 struct sigaction oldAct; 755 sigaction(sig, (struct sigaction *)0, &oldAct); 756 if (oldAct.sa_sigaction != signalHandler) { 757 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 758 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 759 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand); 760 } 761 } 762 763 if (pc == NULL && uc != NULL) { 764 pc = (address) uc->uc_mcontext.gregs[REG_PC]; 765 } 766 767 // unmask current signal 768 sigset_t newset; 769 sigemptyset(&newset); 770 sigaddset(&newset, sig); 771 sigprocmask(SIG_UNBLOCK, &newset, NULL); 772 773 // Determine which sort of error to throw. Out of swap may signal 774 // on the thread stack, which could get a mapping error when touched. 775 address addr = (address) info->si_addr; 776 if (sig == SIGBUS && info->si_code == BUS_OBJERR && info->si_errno == ENOMEM) { 777 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "Out of swap space to map in thread stack."); 778 } 779 780 VMError::report_and_die(t, sig, pc, info, ucVoid); 781 782 ShouldNotReachHere(); 783 return false; 784 } 785 786 void os::print_context(outputStream *st, const void *context) { 787 if (context == NULL) return; 788 789 const ucontext_t *uc = (const ucontext_t*)context; 790 st->print_cr("Registers:"); 791 #ifdef AMD64 792 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); 793 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); 794 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); 795 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); 796 st->cr(); 797 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); 798 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); 799 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); 800 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); 801 st->cr(); 802 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); 803 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); 804 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); 805 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); 806 st->cr(); 807 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); 808 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); 809 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); 810 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); 811 st->cr(); 812 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); 813 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]); 814 #else 815 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]); 816 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]); 817 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]); 818 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]); 819 st->cr(); 820 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]); 821 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]); 822 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]); 823 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]); 824 st->cr(); 825 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]); 826 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]); 827 #endif // AMD64 828 st->cr(); 829 st->cr(); 830 831 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc); 832 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 833 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); 834 st->cr(); 835 836 // Note: it may be unsafe to inspect memory near pc. For example, pc may 837 // point to garbage if entry point in an nmethod is corrupted. Leave 838 // this at the end, and hope for the best. 839 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc); 840 address pc = epc.pc(); 841 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); 842 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 843 } 844 845 void os::print_register_info(outputStream *st, const void *context) { 846 if (context == NULL) return; 847 848 const ucontext_t *uc = (const ucontext_t*)context; 849 850 st->print_cr("Register to memory mapping:"); 851 st->cr(); 852 853 // this is horrendously verbose but the layout of the registers in the 854 // context does not match how we defined our abstract Register set, so 855 // we can't just iterate through the gregs area 856 857 // this is only for the "general purpose" registers 858 859 #ifdef AMD64 860 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); 861 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); 862 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); 863 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); 864 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); 865 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); 866 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); 867 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); 868 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); 869 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); 870 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); 871 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); 872 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); 873 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); 874 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); 875 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); 876 #else 877 st->print("EAX="); print_location(st, uc->uc_mcontext.gregs[EAX]); 878 st->print("EBX="); print_location(st, uc->uc_mcontext.gregs[EBX]); 879 st->print("ECX="); print_location(st, uc->uc_mcontext.gregs[ECX]); 880 st->print("EDX="); print_location(st, uc->uc_mcontext.gregs[EDX]); 881 st->print("ESP="); print_location(st, uc->uc_mcontext.gregs[UESP]); 882 st->print("EBP="); print_location(st, uc->uc_mcontext.gregs[EBP]); 883 st->print("ESI="); print_location(st, uc->uc_mcontext.gregs[ESI]); 884 st->print("EDI="); print_location(st, uc->uc_mcontext.gregs[EDI]); 885 #endif 886 887 st->cr(); 888 } 889 890 891 #ifdef AMD64 892 void os::Solaris::init_thread_fpu_state(void) { 893 // Nothing to do 894 } 895 #else 896 // From solaris_i486.s 897 extern "C" void fixcw(); 898 899 void os::Solaris::init_thread_fpu_state(void) { 900 // Set fpu to 53 bit precision. This happens too early to use a stub. 901 fixcw(); 902 } 903 904 // These routines are the initial value of atomic_xchg_entry(), 905 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry() 906 // until initialization is complete. 907 // TODO - replace with .il implementation when compiler supports it. 908 909 typedef int32_t xchg_func_t (int32_t, volatile int32_t*); 910 typedef int32_t cmpxchg_func_t (int32_t, volatile int32_t*, int32_t); 911 typedef int64_t cmpxchg_long_func_t(int64_t, volatile int64_t*, int64_t); 912 typedef int32_t add_func_t (int32_t, volatile int32_t*); 913 914 int32_t os::atomic_xchg_bootstrap(int32_t exchange_value, volatile int32_t* dest) { 915 // try to use the stub: 916 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); 917 918 if (func != NULL) { 919 os::atomic_xchg_func = func; 920 return (*func)(exchange_value, dest); 921 } 922 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 923 924 int32_t old_value = *dest; 925 *dest = exchange_value; 926 return old_value; 927 } 928 929 int32_t os::atomic_cmpxchg_bootstrap(int32_t exchange_value, volatile int32_t* dest, int32_t compare_value) { 930 // try to use the stub: 931 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); 932 933 if (func != NULL) { 934 os::atomic_cmpxchg_func = func; 935 return (*func)(exchange_value, dest, compare_value); 936 } 937 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 938 939 int32_t old_value = *dest; 940 if (old_value == compare_value) 941 *dest = exchange_value; 942 return old_value; 943 } 944 945 int64_t os::atomic_cmpxchg_long_bootstrap(int64_t exchange_value, volatile int64_t* dest, int64_t compare_value) { 946 // try to use the stub: 947 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); 948 949 if (func != NULL) { 950 os::atomic_cmpxchg_long_func = func; 951 return (*func)(exchange_value, dest, compare_value); 952 } 953 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 954 955 int64_t old_value = *dest; 956 if (old_value == compare_value) 957 *dest = exchange_value; 958 return old_value; 959 } 960 961 int32_t os::atomic_add_bootstrap(int32_t add_value, volatile int32_t* dest) { 962 // try to use the stub: 963 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); 964 965 if (func != NULL) { 966 os::atomic_add_func = func; 967 return (*func)(add_value, dest); 968 } 969 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 970 971 return (*dest) += add_value; 972 } 973 974 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; 975 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; 976 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; 977 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; 978 979 extern "C" void _solaris_raw_setup_fpu(address ptr); 980 void os::setup_fpu() { 981 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); 982 _solaris_raw_setup_fpu(fpu_cntrl); 983 } 984 #endif // AMD64 985 986 #ifndef PRODUCT 987 void os::verify_stack_alignment() { 988 #ifdef AMD64 989 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 990 #endif 991 } 992 #endif 993 994 int os::extra_bang_size_in_bytes() { 995 // JDK-8050147 requires the full cache line bang for x86. 996 return VM_Version::L1_line_size(); 997 }