1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 // This file is organized as os_linux_x86.cpp. 27 28 // no precompiled headers 29 #include "asm/assembler.inline.hpp" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "code/icBuffer.hpp" 34 #include "code/nativeInst.hpp" 35 #include "code/vtableStubs.hpp" 36 #include "compiler/disassembler.hpp" 37 #include "interpreter/interpreter.hpp" 38 #include "jvm_linux.h" 39 #include "memory/allocation.inline.hpp" 40 #include "nativeInst_s390.hpp" 41 #include "os_share_linux.hpp" 42 #include "prims/jniFastGetField.hpp" 43 #include "prims/jvm.h" 44 #include "prims/jvm_misc.hpp" 45 #include "runtime/arguments.hpp" 46 #include "runtime/extendedPC.hpp" 47 #include "runtime/frame.inline.hpp" 48 #include "runtime/interfaceSupport.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/javaCalls.hpp" 51 #include "runtime/mutexLocker.hpp" 52 #include "runtime/osThread.hpp" 53 #include "runtime/sharedRuntime.hpp" 54 #include "runtime/stubRoutines.hpp" 55 #include "runtime/thread.inline.hpp" 56 #include "runtime/timer.hpp" 57 #include "utilities/events.hpp" 58 #include "utilities/vmError.hpp" 59 60 // put OS-includes here 61 # include <sys/types.h> 62 # include <sys/mman.h> 63 # include <pthread.h> 64 # include <signal.h> 65 # include <errno.h> 66 # include <dlfcn.h> 67 # include <stdlib.h> 68 # include <stdio.h> 69 # include <unistd.h> 70 # include <sys/resource.h> 71 # include <pthread.h> 72 # include <sys/stat.h> 73 # include <sys/time.h> 74 # include <sys/utsname.h> 75 # include <sys/socket.h> 76 # include <sys/wait.h> 77 # include <pwd.h> 78 # include <poll.h> 79 # include <ucontext.h> 80 81 address os::current_stack_pointer() { 82 intptr_t* csp; 83 84 // Inline assembly for `z_lgr regno(csp), Z_SP' (Z_SP = Z_R15): 85 __asm__ __volatile__ ("lgr %0, 15":"=r"(csp):); 86 87 assert(((uint64_t)csp & (frame::alignment_in_bytes-1)) == 0, "SP must be aligned"); 88 return (address) csp; 89 } 90 91 char* os::non_memory_address_word() { 92 // Must never look like an address returned by reserve_memory, 93 // even in its subfields (as defined by the CPU immediate fields, 94 // if the CPU splits constants across multiple instructions). 95 return (char*) -1; 96 } 97 98 // OS specific thread initialization. 99 void os::initialize_thread(Thread* thread) { } 100 101 // Frame information (pc, sp, fp) retrieved via ucontext 102 // always looks like a C-frame according to the frame 103 // conventions in frame_s390.hpp. 104 address os::Linux::ucontext_get_pc(const ucontext_t * uc) { 105 return (address)uc->uc_mcontext.psw.addr; 106 } 107 108 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) { 109 uc->uc_mcontext.psw.addr = (unsigned long)pc; 110 } 111 112 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) { 113 return (intptr_t*)uc->uc_mcontext.gregs[15/*REG_SP*/]; 114 } 115 116 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) { 117 return NULL; 118 } 119 120 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 121 intptr_t** ret_sp, intptr_t** ret_fp) { 122 123 ExtendedPC epc; 124 const ucontext_t* uc = (const ucontext_t*)ucVoid; 125 126 if (uc != NULL) { 127 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 128 if (ret_sp) { *ret_sp = os::Linux::ucontext_get_sp(uc); } 129 if (ret_fp) { *ret_fp = os::Linux::ucontext_get_fp(uc); } 130 } else { 131 // Construct empty ExtendedPC for return value checking. 132 epc = ExtendedPC(NULL); 133 if (ret_sp) { *ret_sp = (intptr_t *)NULL; } 134 if (ret_fp) { *ret_fp = (intptr_t *)NULL; } 135 } 136 137 return epc; 138 } 139 140 frame os::fetch_frame_from_context(const void* ucVoid) { 141 intptr_t* sp; 142 intptr_t* fp; 143 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 144 return frame(sp, epc.pc()); 145 } 146 147 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { 148 address pc = (address) os::Linux::ucontext_get_pc(uc); 149 if (Interpreter::contains(pc)) { 150 // Interpreter performs stack banging after the fixed frame header has 151 // been generated while the compilers perform it before. To maintain 152 // semantic consistency between interpreted and compiled frames, the 153 // method returns the Java sender of the current frame. 154 *fr = os::fetch_frame_from_context(uc); 155 if (!fr->is_first_java_frame()) { 156 assert(fr->safe_for_sender(thread), "Safety check"); 157 *fr = fr->java_sender(); 158 } 159 } else { 160 // More complex code with compiled code. 161 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 162 CodeBlob* cb = CodeCache::find_blob(pc); 163 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 164 // Not sure where the pc points to, fallback to default 165 // stack overflow handling. In compiled code, we bang before 166 // the frame is complete. 167 return false; 168 } else { 169 intptr_t* fp = os::Linux::ucontext_get_fp(uc); 170 intptr_t* sp = os::Linux::ucontext_get_sp(uc); 171 *fr = frame(sp, (address)*sp); 172 if (!fr->is_java_frame()) { 173 assert(fr->safe_for_sender(thread), "Safety check"); 174 assert(!fr->is_first_frame(), "Safety check"); 175 *fr = fr->java_sender(); 176 } 177 } 178 } 179 assert(fr->is_java_frame(), "Safety check"); 180 return true; 181 } 182 183 frame os::get_sender_for_C_frame(frame* fr) { 184 if (*fr->sp() == 0) { 185 // fr is the last C frame. 186 return frame(); 187 } 188 189 // If its not one of our frames, the return pc is saved at gpr14 190 // stack slot. The call_stub stores the return_pc to the stack slot 191 // of gpr10. 192 if ((Interpreter::code() != NULL && Interpreter::contains(fr->pc())) || 193 (CodeCache::contains(fr->pc()) && !StubRoutines::contains(fr->pc()))) { 194 return frame(fr->sender_sp(), fr->sender_pc()); 195 } else { 196 if (StubRoutines::contains(fr->pc())) { 197 StubCodeDesc* desc = StubCodeDesc::desc_for(fr->pc()); 198 if (desc && !strcmp(desc->name(),"call_stub")) { 199 return frame(fr->sender_sp(), fr->callstub_sender_pc()); 200 } else { 201 return frame(fr->sender_sp(), fr->sender_pc()); 202 } 203 } else { 204 return frame(fr->sender_sp(), fr->native_sender_pc()); 205 } 206 } 207 } 208 209 frame os::current_frame() { 210 // Expected to return the stack pointer of this method. 211 // But if inlined, returns the stack pointer of our caller! 212 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer()); 213 assert (csp != NULL, "sp should not be NULL"); 214 // Pass a dummy pc. This way we don't have to load it from the 215 // stack, since we don't know in which slot we can find it. 216 frame topframe(csp, (address)0x8); 217 if (os::is_first_C_frame(&topframe)) { 218 // Stack is not walkable. 219 return frame(); 220 } else { 221 frame senderFrame = os::get_sender_for_C_frame(&topframe); 222 assert(senderFrame.pc() != NULL, "Sender pc should not be NULL"); 223 // Return sender of sender of current topframe which hopefully 224 // both have pc != NULL. 225 #ifdef _NMT_NOINLINE_ // Is set in slowdebug builds. 226 // Current_stack_pointer is not inlined, we must pop one more frame. 227 frame tmp = os::get_sender_for_C_frame(&topframe); 228 return os::get_sender_for_C_frame(&tmp); 229 #else 230 return os::get_sender_for_C_frame(&topframe); 231 #endif 232 } 233 } 234 235 // Utility functions 236 237 extern "C" JNIEXPORT int 238 JVM_handle_linux_signal(int sig, 239 siginfo_t* info, 240 void* ucVoid, 241 int abort_if_unrecognized) { 242 ucontext_t* uc = (ucontext_t*) ucVoid; 243 244 Thread* t = Thread::current_or_null_safe(); 245 246 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 247 // (no destructors can be run). 248 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 249 250 SignalHandlerMark shm(t); 251 252 // Note: it's not uncommon that JNI code uses signal/sigset to install 253 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 254 // or have a SIGILL handler when detecting CPU type). When that happens, 255 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 256 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 257 // that do not require siginfo/ucontext first. 258 259 if (sig == SIGPIPE) { 260 if (os::Linux::chained_handler(sig, info, ucVoid)) { 261 return true; 262 } else { 263 if (PrintMiscellaneous && (WizardMode || Verbose)) { 264 warning("Ignoring SIGPIPE - see bug 4229104"); 265 } 266 return true; 267 } 268 } 269 270 JavaThread* thread = NULL; 271 VMThread* vmthread = NULL; 272 if (os::Linux::signal_handlers_are_installed) { 273 if (t != NULL) { 274 if(t->is_Java_thread()) { 275 thread = (JavaThread*)t; 276 } else if(t->is_VM_thread()) { 277 vmthread = (VMThread *)t; 278 } 279 } 280 } 281 282 // Moved SafeFetch32 handling outside thread!=NULL conditional block to make 283 // it work if no associated JavaThread object exists. 284 if (uc) { 285 address const pc = os::Linux::ucontext_get_pc(uc); 286 if (pc && StubRoutines::is_safefetch_fault(pc)) { 287 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 288 return true; 289 } 290 } 291 292 // Decide if this trap can be handled by a stub. 293 address stub = NULL; 294 address pc = NULL; // Pc as retrieved from PSW. Usually points past failing instruction. 295 address trap_pc = NULL; // Pc of the instruction causing the trap. 296 297 //%note os_trap_1 298 if (info != NULL && uc != NULL && thread != NULL) { 299 pc = os::Linux::ucontext_get_pc(uc); 300 if (TraceTraps) { 301 tty->print_cr(" pc at " INTPTR_FORMAT, p2i(pc)); 302 } 303 if ((unsigned long)(pc - (address)info->si_addr) <= (unsigned long)Assembler::instr_maxlen() ) { 304 trap_pc = (address)info->si_addr; 305 if (TraceTraps) { 306 tty->print_cr("trap_pc at " INTPTR_FORMAT, p2i(trap_pc)); 307 } 308 } 309 310 // Handle ALL stack overflow variations here 311 if (sig == SIGSEGV) { 312 address addr = (address)info->si_addr; // Address causing SIGSEGV, usually mem ref target. 313 314 // Check if fault address is within thread stack. 315 if (thread->on_local_stack(addr)) { 316 // stack overflow 317 if (thread->in_stack_yellow_reserved_zone(addr)) { 318 if (thread->thread_state() == _thread_in_Java) { 319 if (thread->in_stack_reserved_zone(addr)) { 320 frame fr; 321 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) { 322 assert(fr.is_java_frame(), "Must be a Javac frame"); 323 frame activation = 324 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 325 if (activation.sp() != NULL) { 326 thread->disable_stack_reserved_zone(); 327 if (activation.is_interpreted_frame()) { 328 thread->set_reserved_stack_activation((address)activation.fp()); 329 } else { 330 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 331 } 332 return 1; 333 } 334 } 335 } 336 // Throw a stack overflow exception. 337 // Guard pages will be reenabled while unwinding the stack. 338 thread->disable_stack_yellow_reserved_zone(); 339 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 340 } else { 341 // Thread was in the vm or native code. Return and try to finish. 342 thread->disable_stack_yellow_reserved_zone(); 343 return 1; 344 } 345 } else if (thread->in_stack_red_zone(addr)) { 346 // Fatal red zone violation. Disable the guard pages and fall through 347 // to handle_unexpected_exception way down below. 348 thread->disable_stack_red_zone(); 349 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 350 351 // This is a likely cause, but hard to verify. Let's just print 352 // it as a hint. 353 tty->print_raw_cr("Please check if any of your loaded .so files has " 354 "enabled executable stack (see man page execstack(8))"); 355 } else { 356 // Accessing stack address below sp may cause SEGV if current 357 // thread has MAP_GROWSDOWN stack. This should only happen when 358 // current thread was created by user code with MAP_GROWSDOWN flag 359 // and then attached to VM. See notes in os_linux.cpp. 360 if (thread->osthread()->expanding_stack() == 0) { 361 thread->osthread()->set_expanding_stack(); 362 if (os::Linux::manually_expand_stack(thread, addr)) { 363 thread->osthread()->clear_expanding_stack(); 364 return 1; 365 } 366 thread->osthread()->clear_expanding_stack(); 367 } else { 368 fatal("recursive segv. expanding stack."); 369 } 370 } 371 } 372 } 373 374 if (thread->thread_state() == _thread_in_Java) { 375 // Java thread running in Java code => find exception handler if any 376 // a fault inside compiled code, the interpreter, or a stub 377 378 // Handle signal from NativeJump::patch_verified_entry(). 379 if (sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) { 380 if (TraceTraps) { 381 tty->print_cr("trap: zombie_not_entrant (SIGILL)"); 382 } 383 stub = SharedRuntime::get_handle_wrong_method_stub(); 384 } 385 386 else if (sig == SIGSEGV && 387 os::is_poll_address((address)info->si_addr)) { 388 if (TraceTraps) { 389 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); 390 } 391 stub = SharedRuntime::get_poll_stub(pc); 392 393 // Info->si_addr only points to the page base address, so we 394 // must extract the real si_addr from the instruction and the 395 // ucontext. 396 assert(((NativeInstruction*)pc)->is_safepoint_poll(), "must be safepoint poll"); 397 const address real_si_addr = ((NativeInstruction*)pc)->get_poll_address(uc); 398 } 399 400 // SIGTRAP-based implicit null check in compiled code. 401 else if ((sig == SIGFPE) && 402 TrapBasedNullChecks && 403 (trap_pc != NULL) && 404 Assembler::is_sigtrap_zero_check(trap_pc)) { 405 if (TraceTraps) { 406 tty->print_cr("trap: NULL_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc)); 407 } 408 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL); 409 } 410 411 else if (sig == SIGSEGV && ImplicitNullChecks && 412 CodeCache::contains((void*) pc) && 413 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) { 414 if (TraceTraps) { 415 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); 416 } 417 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 418 } 419 420 // SIGTRAP-based implicit range check in compiled code. 421 else if (sig == SIGFPE && TrapBasedRangeChecks && 422 (trap_pc != NULL) && 423 Assembler::is_sigtrap_range_check(trap_pc)) { 424 if (TraceTraps) { 425 tty->print_cr("trap: RANGE_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc)); 426 } 427 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL); 428 } 429 430 else if (sig == SIGFPE && info->si_code == FPE_INTDIV) { 431 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 432 } 433 434 else if (sig == SIGBUS) { 435 // BugId 4454115: A read from a MappedByteBuffer can fault here if the 436 // underlying file has been truncated. Do not crash the VM in such a case. 437 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 438 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 439 if (nm != NULL && nm->has_unsafe_access()) { 440 // We don't really need a stub here! Just set the pending exeption and 441 // continue at the next instruction after the faulting read. Returning 442 // garbage from this read is ok. 443 thread->set_pending_unsafe_access_error(); 444 uc->uc_mcontext.psw.addr = ((unsigned long)pc) + Assembler::instr_len(pc); 445 return true; 446 } 447 } 448 } 449 450 else { // thread->thread_state() != _thread_in_Java 451 if (sig == SIGILL && VM_Version::is_determine_features_test_running()) { 452 // SIGILL must be caused by VM_Version::determine_features(). 453 //*(int *) (pc-6)=0; // Patch instruction to 0 to indicate that it causes a SIGILL. 454 // Flushing of icache is not necessary. 455 stub = pc; // Continue with next instruction. 456 } else if (thread->thread_state() == _thread_in_vm && 457 sig == SIGBUS && thread->doing_unsafe_access()) { 458 // We don't really need a stub here! Just set the pending exeption and 459 // continue at the next instruction after the faulting read. Returning 460 // garbage from this read is ok. 461 thread->set_pending_unsafe_access_error(); 462 os::Linux::ucontext_set_pc(uc, pc + Assembler::instr_len(pc)); 463 return true; 464 } 465 } 466 467 // Check to see if we caught the safepoint code in the 468 // process of write protecting the memory serialization page. 469 // It write enables the page immediately after protecting it 470 // so we can just return to retry the write. 471 // Info->si_addr need not be the exact address, it is only 472 // guaranteed to be on the same page as the address that caused 473 // the SIGSEGV. 474 if ((sig == SIGSEGV) && 475 (os::get_memory_serialize_page() == 476 (address)((uintptr_t)info->si_addr & ~(os::vm_page_size()-1)))) { 477 return true; 478 } 479 } 480 481 if (stub != NULL) { 482 // Save all thread context in case we need to restore it. 483 if (thread != NULL) thread->set_saved_exception_pc(pc); 484 os::Linux::ucontext_set_pc(uc, stub); 485 return true; 486 } 487 488 // signal-chaining 489 if (os::Linux::chained_handler(sig, info, ucVoid)) { 490 return true; 491 } 492 493 if (!abort_if_unrecognized) { 494 // caller wants another chance, so give it to him 495 return false; 496 } 497 498 if (pc == NULL && uc != NULL) { 499 pc = os::Linux::ucontext_get_pc(uc); 500 } 501 502 // unmask current signal 503 sigset_t newset; 504 sigemptyset(&newset); 505 sigaddset(&newset, sig); 506 sigprocmask(SIG_UNBLOCK, &newset, NULL); 507 508 VMError::report_and_die(t, sig, pc, info, ucVoid); 509 510 ShouldNotReachHere(); 511 return false; 512 } 513 514 void os::Linux::init_thread_fpu_state(void) { 515 // Nothing to do on z/Architecture. 516 } 517 518 int os::Linux::get_fpu_control_word(void) { 519 // Nothing to do on z/Architecture. 520 return 0; 521 } 522 523 void os::Linux::set_fpu_control_word(int fpu_control) { 524 // Nothing to do on z/Architecture. 525 } 526 527 //////////////////////////////////////////////////////////////////////////////// 528 // thread stack 529 530 // Minimum usable stack sizes required to get to user code. Space for 531 // HotSpot guard pages is added later. 532 size_t os::Posix::_compiler_thread_min_stack_allowed = (52 DEBUG_ONLY(+ 32)) * K; 533 size_t os::Posix::_java_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 8)) * K; 534 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 32 * K; 535 536 // Return default stack size for thr_type. 537 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 538 // Default stack size (compiler thread needs larger stack). 539 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K); 540 return s; 541 } 542 543 ///////////////////////////////////////////////////////////////////////////// 544 // helper functions for fatal error handler 545 546 void os::print_context(outputStream *st, const void *context) { 547 if (context == NULL) return; 548 549 const ucontext_t* uc = (const ucontext_t*)context; 550 551 st->print_cr("Processor state:"); 552 st->print_cr("----------------"); 553 st->print_cr(" ip = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.addr); 554 st->print_cr(" proc mask = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.mask); 555 st->print_cr(" fpc reg = 0x%8.8x " , uc->uc_mcontext.fpregs.fpc); 556 st->cr(); 557 558 st->print_cr("General Purpose Registers:"); 559 st->print_cr("--------------------------"); 560 for( int i = 0; i < 16; i+=2 ) { 561 st->print(" r%-2d = " INTPTR_FORMAT " " , i, uc->uc_mcontext.gregs[i]); 562 st->print(" r%-2d = " INTPTR_FORMAT " |", i+1, uc->uc_mcontext.gregs[i+1]); 563 st->print(" r%-2d = %23.1ld " , i, uc->uc_mcontext.gregs[i]); 564 st->print(" r%-2d = %23.1ld " , i+1, uc->uc_mcontext.gregs[i+1]); 565 st->cr(); 566 } 567 st->cr(); 568 569 st->print_cr("Access Registers:"); 570 st->print_cr("-----------------"); 571 for( int i = 0; i < 16; i+=2 ) { 572 st->print(" ar%-2d = 0x%8.8x ", i, uc->uc_mcontext.aregs[i]); 573 st->print(" ar%-2d = 0x%8.8x ", i+1, uc->uc_mcontext.aregs[i+1]); 574 st->cr(); 575 } 576 st->cr(); 577 578 st->print_cr("Float Registers:"); 579 st->print_cr("----------------"); 580 for (int i = 0; i < 16; i += 2) { 581 st->print(" fr%-2d = " INTPTR_FORMAT " " , i, (int64_t)(uc->uc_mcontext.fpregs.fprs[i].d)); 582 st->print(" fr%-2d = " INTPTR_FORMAT " |", i+1, (int64_t)(uc->uc_mcontext.fpregs.fprs[i+1].d)); 583 st->print(" fr%-2d = %23.15e " , i, (uc->uc_mcontext.fpregs.fprs[i].d)); 584 st->print(" fr%-2d = %23.15e " , i+1, (uc->uc_mcontext.fpregs.fprs[i+1].d)); 585 st->cr(); 586 } 587 st->cr(); 588 st->cr(); 589 590 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 591 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); 592 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t)); 593 st->cr(); 594 595 // Note: it may be unsafe to inspect memory near pc. For example, pc may 596 // point to garbage if entry point in an nmethod is corrupted. Leave 597 // this at the end, and hope for the best. 598 address pc = os::Linux::ucontext_get_pc(uc); 599 if (Verbose) { st->print_cr("pc at " PTR_FORMAT, p2i(pc)); } 600 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 601 print_hex_dump(st, pc-64, pc+64, /*intrsize=*/4); 602 st->cr(); 603 } 604 605 void os::print_register_info(outputStream *st, const void *context) { 606 st->print("Not ported\n"); 607 } 608 609 #ifndef PRODUCT 610 void os::verify_stack_alignment() { 611 } 612 #endif 613 614 int os::extra_bang_size_in_bytes() { 615 // z/Architecture does not require the additional stack bang. 616 return 0; 617 }