1 /* 2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016, 2018 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 "jvm.h" 30 #include "asm/assembler.inline.hpp" 31 #include "classfile/classLoader.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/vmSymbols.hpp" 34 #include "code/icBuffer.hpp" 35 #include "code/nativeInst.hpp" 36 #include "code/vtableStubs.hpp" 37 #include "compiler/disassembler.hpp" 38 #include "interpreter/interpreter.hpp" 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_misc.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/extendedPC.hpp" 46 #include "runtime/frame.inline.hpp" 47 #include "runtime/interfaceSupport.inline.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/javaCalls.hpp" 50 #include "runtime/mutexLocker.hpp" 51 #include "runtime/osThread.hpp" 52 #include "runtime/sharedRuntime.hpp" 53 #include "runtime/stubRoutines.hpp" 54 #include "runtime/thread.inline.hpp" 55 #include "runtime/timer.hpp" 56 #include "utilities/events.hpp" 57 #include "utilities/vmError.hpp" 58 59 // put OS-includes here 60 # include <sys/types.h> 61 # include <sys/mman.h> 62 # include <pthread.h> 63 # include <signal.h> 64 # include <errno.h> 65 # include <dlfcn.h> 66 # include <stdlib.h> 67 # include <stdio.h> 68 # include <unistd.h> 69 # include <sys/resource.h> 70 # include <pthread.h> 71 # include <sys/stat.h> 72 # include <sys/time.h> 73 # include <sys/utsname.h> 74 # include <sys/socket.h> 75 # include <sys/wait.h> 76 # include <pwd.h> 77 # include <poll.h> 78 # include <ucontext.h> 79 80 address os::current_stack_pointer() { 81 intptr_t* csp; 82 83 // Inline assembly for `z_lgr regno(csp), Z_SP' (Z_SP = Z_R15): 84 __asm__ __volatile__ ("lgr %0, 15":"=r"(csp):); 85 86 assert(((uint64_t)csp & (frame::alignment_in_bytes-1)) == 0, "SP must be aligned"); 87 return (address) csp; 88 } 89 90 char* os::non_memory_address_word() { 91 // Must never look like an address returned by reserve_memory, 92 // even in its subfields (as defined by the CPU immediate fields, 93 // if the CPU splits constants across multiple instructions). 94 return (char*) -1; 95 } 96 97 // OS specific thread initialization. 98 void os::initialize_thread(Thread* thread) { } 99 100 // Frame information (pc, sp, fp) retrieved via ucontext 101 // always looks like a C-frame according to the frame 102 // conventions in frame_s390.hpp. 103 address os::Linux::ucontext_get_pc(const ucontext_t * uc) { 104 return (address)uc->uc_mcontext.psw.addr; 105 } 106 107 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) { 108 uc->uc_mcontext.psw.addr = (unsigned long)pc; 109 } 110 111 static address ucontext_get_lr(const ucontext_t * uc) { 112 return (address)uc->uc_mcontext.gregs[14/*LINK*/]; 113 } 114 115 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) { 116 return (intptr_t*)uc->uc_mcontext.gregs[15/*REG_SP*/]; 117 } 118 119 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) { 120 return NULL; 121 } 122 123 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 124 intptr_t** ret_sp, intptr_t** ret_fp) { 125 126 ExtendedPC epc; 127 const ucontext_t* uc = (const ucontext_t*)ucVoid; 128 129 if (uc != NULL) { 130 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 131 if (ret_sp) { *ret_sp = os::Linux::ucontext_get_sp(uc); } 132 if (ret_fp) { *ret_fp = os::Linux::ucontext_get_fp(uc); } 133 } else { 134 // Construct empty ExtendedPC for return value checking. 135 epc = ExtendedPC(NULL); 136 if (ret_sp) { *ret_sp = (intptr_t *)NULL; } 137 if (ret_fp) { *ret_fp = (intptr_t *)NULL; } 138 } 139 140 return epc; 141 } 142 143 frame os::fetch_frame_from_context(const void* ucVoid) { 144 intptr_t* sp; 145 intptr_t* fp; 146 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 147 return frame(sp, epc.pc()); 148 } 149 150 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { 151 address pc = (address) os::Linux::ucontext_get_pc(uc); 152 if (Interpreter::contains(pc)) { 153 // Interpreter performs stack banging after the fixed frame header has 154 // been generated while the compilers perform it before. To maintain 155 // semantic consistency between interpreted and compiled frames, the 156 // method returns the Java sender of the current frame. 157 *fr = os::fetch_frame_from_context(uc); 158 if (!fr->is_first_java_frame()) { 159 assert(fr->safe_for_sender(thread), "Safety check"); 160 *fr = fr->java_sender(); 161 } 162 } else { 163 // More complex code with compiled code. 164 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 165 CodeBlob* cb = CodeCache::find_blob(pc); 166 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 167 // Not sure where the pc points to, fallback to default 168 // stack overflow handling. In compiled code, we bang before 169 // the frame is complete. 170 return false; 171 } else { 172 intptr_t* sp = os::Linux::ucontext_get_sp(uc); 173 address lr = ucontext_get_lr(uc); 174 *fr = frame(sp, lr); 175 if (!fr->is_java_frame()) { 176 assert(fr->safe_for_sender(thread), "Safety check"); 177 assert(!fr->is_first_frame(), "Safety check"); 178 *fr = fr->java_sender(); 179 } 180 } 181 } 182 assert(fr->is_java_frame(), "Safety check"); 183 return true; 184 } 185 186 frame os::get_sender_for_C_frame(frame* fr) { 187 if (*fr->sp() == 0) { 188 // fr is the last C frame. 189 return frame(); 190 } 191 192 // If its not one of our frames, the return pc is saved at gpr14 193 // stack slot. The call_stub stores the return_pc to the stack slot 194 // of gpr10. 195 if ((Interpreter::code() != NULL && Interpreter::contains(fr->pc())) || 196 (CodeCache::contains(fr->pc()) && !StubRoutines::contains(fr->pc()))) { 197 return frame(fr->sender_sp(), fr->sender_pc()); 198 } else { 199 if (StubRoutines::contains(fr->pc())) { 200 StubCodeDesc* desc = StubCodeDesc::desc_for(fr->pc()); 201 if (desc && !strcmp(desc->name(),"call_stub")) { 202 return frame(fr->sender_sp(), fr->callstub_sender_pc()); 203 } else { 204 return frame(fr->sender_sp(), fr->sender_pc()); 205 } 206 } else { 207 return frame(fr->sender_sp(), fr->native_sender_pc()); 208 } 209 } 210 } 211 212 frame os::current_frame() { 213 // Expected to return the stack pointer of this method. 214 // But if inlined, returns the stack pointer of our caller! 215 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer()); 216 assert (csp != NULL, "sp should not be NULL"); 217 // Pass a dummy pc. This way we don't have to load it from the 218 // stack, since we don't know in which slot we can find it. 219 frame topframe(csp, (address)0x8); 220 if (os::is_first_C_frame(&topframe)) { 221 // Stack is not walkable. 222 return frame(); 223 } else { 224 frame senderFrame = os::get_sender_for_C_frame(&topframe); 225 assert(senderFrame.pc() != NULL, "Sender pc should not be NULL"); 226 // Return sender of sender of current topframe which hopefully 227 // both have pc != NULL. 228 #ifdef _NMT_NOINLINE_ // Is set in slowdebug builds. 229 // Current_stack_pointer is not inlined, we must pop one more frame. 230 frame tmp = os::get_sender_for_C_frame(&topframe); 231 return os::get_sender_for_C_frame(&tmp); 232 #else 233 return os::get_sender_for_C_frame(&topframe); 234 #endif 235 } 236 } 237 238 // Utility functions 239 240 extern "C" JNIEXPORT int 241 JVM_handle_linux_signal(int sig, 242 siginfo_t* info, 243 void* ucVoid, 244 int abort_if_unrecognized) { 245 ucontext_t* uc = (ucontext_t*) ucVoid; 246 247 Thread* t = Thread::current_or_null_safe(); 248 249 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 250 // (no destructors can be run). 251 os::ThreadCrashProtection::check_crash_protection(sig, t); 252 253 SignalHandlerMark shm(t); 254 255 // Note: it's not uncommon that JNI code uses signal/sigset to install 256 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 257 // or have a SIGILL handler when detecting CPU type). When that happens, 258 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 259 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 260 // that do not require siginfo/ucontext first. 261 262 if (sig == SIGPIPE) { 263 if (os::Linux::chained_handler(sig, info, ucVoid)) { 264 return true; 265 } else { 266 if (PrintMiscellaneous && (WizardMode || Verbose)) { 267 warning("Ignoring SIGPIPE - see bug 4229104"); 268 } 269 return true; 270 } 271 } 272 273 JavaThread* thread = NULL; 274 VMThread* vmthread = NULL; 275 if (os::Linux::signal_handlers_are_installed) { 276 if (t != NULL) { 277 if(t->is_Java_thread()) { 278 thread = (JavaThread*)t; 279 } else if(t->is_VM_thread()) { 280 vmthread = (VMThread *)t; 281 } 282 } 283 } 284 285 // Moved SafeFetch32 handling outside thread!=NULL conditional block to make 286 // it work if no associated JavaThread object exists. 287 if (uc) { 288 address const pc = os::Linux::ucontext_get_pc(uc); 289 if (pc && StubRoutines::is_safefetch_fault(pc)) { 290 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 291 return true; 292 } 293 } 294 295 // Decide if this trap can be handled by a stub. 296 address stub = NULL; 297 address pc = NULL; // Pc as retrieved from PSW. Usually points past failing instruction. 298 address trap_pc = NULL; // Pc of the instruction causing the trap. 299 300 //%note os_trap_1 301 if (info != NULL && uc != NULL && thread != NULL) { 302 pc = os::Linux::ucontext_get_pc(uc); 303 if (TraceTraps) { 304 tty->print_cr(" pc at " INTPTR_FORMAT, p2i(pc)); 305 } 306 if ((unsigned long)(pc - (address)info->si_addr) <= (unsigned long)Assembler::instr_maxlen() ) { 307 trap_pc = (address)info->si_addr; 308 if (TraceTraps) { 309 tty->print_cr("trap_pc at " INTPTR_FORMAT, p2i(trap_pc)); 310 } 311 } 312 313 // Handle ALL stack overflow variations here 314 if (sig == SIGSEGV) { 315 address addr = (address)info->si_addr; // Address causing SIGSEGV, usually mem ref target. 316 317 // Check if fault address is within thread stack. 318 if (thread->on_local_stack(addr)) { 319 // stack overflow 320 if (thread->in_stack_yellow_reserved_zone(addr)) { 321 if (thread->thread_state() == _thread_in_Java) { 322 if (thread->in_stack_reserved_zone(addr)) { 323 frame fr; 324 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) { 325 assert(fr.is_java_frame(), "Must be a Javac frame"); 326 frame activation = 327 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 328 if (activation.sp() != NULL) { 329 thread->disable_stack_reserved_zone(); 330 if (activation.is_interpreted_frame()) { 331 thread->set_reserved_stack_activation((address)activation.fp()); 332 } else { 333 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 334 } 335 return 1; 336 } 337 } 338 } 339 // Throw a stack overflow exception. 340 // Guard pages will be reenabled while unwinding the stack. 341 thread->disable_stack_yellow_reserved_zone(); 342 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 343 } else { 344 // Thread was in the vm or native code. Return and try to finish. 345 thread->disable_stack_yellow_reserved_zone(); 346 return 1; 347 } 348 } else if (thread->in_stack_red_zone(addr)) { 349 // Fatal red zone violation. Disable the guard pages and fall through 350 // to handle_unexpected_exception way down below. 351 thread->disable_stack_red_zone(); 352 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 353 354 // This is a likely cause, but hard to verify. Let's just print 355 // it as a hint. 356 tty->print_raw_cr("Please check if any of your loaded .so files has " 357 "enabled executable stack (see man page execstack(8))"); 358 } else { 359 // Accessing stack address below sp may cause SEGV if current 360 // thread has MAP_GROWSDOWN stack. This should only happen when 361 // current thread was created by user code with MAP_GROWSDOWN flag 362 // and then attached to VM. See notes in os_linux.cpp. 363 if (thread->osthread()->expanding_stack() == 0) { 364 thread->osthread()->set_expanding_stack(); 365 if (os::Linux::manually_expand_stack(thread, addr)) { 366 thread->osthread()->clear_expanding_stack(); 367 return 1; 368 } 369 thread->osthread()->clear_expanding_stack(); 370 } else { 371 fatal("recursive segv. expanding stack."); 372 } 373 } 374 } 375 } 376 377 if (thread->thread_state() == _thread_in_Java) { 378 // Java thread running in Java code => find exception handler if any 379 // a fault inside compiled code, the interpreter, or a stub 380 381 // Handle signal from NativeJump::patch_verified_entry(). 382 if (sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) { 383 if (TraceTraps) { 384 tty->print_cr("trap: zombie_not_entrant (SIGILL)"); 385 } 386 stub = SharedRuntime::get_handle_wrong_method_stub(); 387 } 388 389 else if (sig == SIGSEGV && 390 os::is_poll_address((address)info->si_addr)) { 391 if (TraceTraps) { 392 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); 393 } 394 stub = SharedRuntime::get_poll_stub(pc); 395 396 // Info->si_addr only points to the page base address, so we 397 // must extract the real si_addr from the instruction and the 398 // ucontext. 399 assert(((NativeInstruction*)pc)->is_safepoint_poll(), "must be safepoint poll"); 400 const address real_si_addr = ((NativeInstruction*)pc)->get_poll_address(uc); 401 } 402 403 // SIGTRAP-based implicit null check in compiled code. 404 else if ((sig == SIGFPE) && 405 TrapBasedNullChecks && 406 (trap_pc != NULL) && 407 Assembler::is_sigtrap_zero_check(trap_pc)) { 408 if (TraceTraps) { 409 tty->print_cr("trap: NULL_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc)); 410 } 411 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL); 412 } 413 414 else if (sig == SIGSEGV && ImplicitNullChecks && 415 CodeCache::contains((void*) pc) && 416 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) { 417 if (TraceTraps) { 418 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); 419 } 420 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 421 } 422 423 // SIGTRAP-based implicit range check in compiled code. 424 else if (sig == SIGFPE && TrapBasedRangeChecks && 425 (trap_pc != NULL) && 426 Assembler::is_sigtrap_range_check(trap_pc)) { 427 if (TraceTraps) { 428 tty->print_cr("trap: RANGE_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc)); 429 } 430 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL); 431 } 432 433 else if (sig == SIGFPE && info->si_code == FPE_INTDIV) { 434 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 435 } 436 437 else if (sig == SIGBUS) { 438 // BugId 4454115: A read from a MappedByteBuffer can fault here if the 439 // underlying file has been truncated. Do not crash the VM in such a case. 440 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 441 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 442 if (nm != NULL && nm->has_unsafe_access()) { 443 // We don't really need a stub here! Just set the pending exeption and 444 // continue at the next instruction after the faulting read. Returning 445 // garbage from this read is ok. 446 thread->set_pending_unsafe_access_error(); 447 uc->uc_mcontext.psw.addr = ((unsigned long)pc) + Assembler::instr_len(pc); 448 return true; 449 } 450 } 451 } 452 453 else { // thread->thread_state() != _thread_in_Java 454 if ((sig == SIGILL) && VM_Version::is_determine_features_test_running()) { 455 // SIGILL must be caused by VM_Version::determine_features() 456 // when attempting to execute a non-existing instruction. 457 //*(int *) (pc-6)=0; // Patch instruction to 0 to indicate that it causes a SIGILL. 458 // Flushing of icache is not necessary. 459 stub = pc; // Continue with next instruction. 460 } else if ((sig == SIGFPE) && VM_Version::is_determine_features_test_running()) { 461 // SIGFPE is known to be caused by trying to execute a vector instruction 462 // when the vector facility is installed, but operating system support is missing. 463 VM_Version::reset_has_VectorFacility(); 464 stub = pc; // Continue with next instruction. 465 } else if (thread->thread_state() == _thread_in_vm && 466 sig == SIGBUS && thread->doing_unsafe_access()) { 467 // We don't really need a stub here! Just set the pending exeption and 468 // continue at the next instruction after the faulting read. Returning 469 // garbage from this read is ok. 470 thread->set_pending_unsafe_access_error(); 471 os::Linux::ucontext_set_pc(uc, pc + Assembler::instr_len(pc)); 472 return true; 473 } 474 } 475 476 // Check to see if we caught the safepoint code in the 477 // process of write protecting the memory serialization page. 478 // It write enables the page immediately after protecting it 479 // so we can just return to retry the write. 480 // Info->si_addr need not be the exact address, it is only 481 // guaranteed to be on the same page as the address that caused 482 // the SIGSEGV. 483 if ((sig == SIGSEGV) && !UseMembar && 484 (os::get_memory_serialize_page() == 485 (address)((uintptr_t)info->si_addr & ~(os::vm_page_size()-1)))) { 486 return true; 487 } 488 } 489 490 if (stub != NULL) { 491 // Save all thread context in case we need to restore it. 492 if (thread != NULL) thread->set_saved_exception_pc(pc); 493 os::Linux::ucontext_set_pc(uc, stub); 494 return true; 495 } 496 497 // signal-chaining 498 if (os::Linux::chained_handler(sig, info, ucVoid)) { 499 return true; 500 } 501 502 if (!abort_if_unrecognized) { 503 // caller wants another chance, so give it to him 504 return false; 505 } 506 507 if (pc == NULL && uc != NULL) { 508 pc = os::Linux::ucontext_get_pc(uc); 509 } 510 511 // unmask current signal 512 sigset_t newset; 513 sigemptyset(&newset); 514 sigaddset(&newset, sig); 515 sigprocmask(SIG_UNBLOCK, &newset, NULL); 516 517 // Hand down correct pc for SIGILL, SIGFPE. pc from context 518 // usually points to the instruction after the failing instruction. 519 // Note: this should be combined with the trap_pc handling above, 520 // because it handles the same issue. 521 if (sig == SIGILL || sig == SIGFPE) { 522 pc = (address)info->si_addr; 523 } 524 525 VMError::report_and_die(t, sig, pc, info, ucVoid); 526 527 ShouldNotReachHere(); 528 return false; 529 } 530 531 void os::Linux::init_thread_fpu_state(void) { 532 // Nothing to do on z/Architecture. 533 } 534 535 int os::Linux::get_fpu_control_word(void) { 536 // Nothing to do on z/Architecture. 537 return 0; 538 } 539 540 void os::Linux::set_fpu_control_word(int fpu_control) { 541 // Nothing to do on z/Architecture. 542 } 543 544 //////////////////////////////////////////////////////////////////////////////// 545 // thread stack 546 547 // Minimum usable stack sizes required to get to user code. Space for 548 // HotSpot guard pages is added later. 549 size_t os::Posix::_compiler_thread_min_stack_allowed = (52 DEBUG_ONLY(+ 32)) * K; 550 size_t os::Posix::_java_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 8)) * K; 551 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 32 * K; 552 553 // Return default stack size for thr_type. 554 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 555 // Default stack size (compiler thread needs larger stack). 556 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K); 557 return s; 558 } 559 560 ///////////////////////////////////////////////////////////////////////////// 561 // helper functions for fatal error handler 562 563 void os::print_context(outputStream *st, const void *context) { 564 if (context == NULL) return; 565 566 const ucontext_t* uc = (const ucontext_t*)context; 567 568 st->print_cr("Processor state:"); 569 st->print_cr("----------------"); 570 st->print_cr(" ip = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.addr); 571 st->print_cr(" proc mask = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.mask); 572 st->print_cr(" fpc reg = 0x%8.8x " , uc->uc_mcontext.fpregs.fpc); 573 st->cr(); 574 575 st->print_cr("General Purpose Registers:"); 576 st->print_cr("--------------------------"); 577 for( int i = 0; i < 16; i+=2 ) { 578 st->print(" r%-2d = " INTPTR_FORMAT " " , i, uc->uc_mcontext.gregs[i]); 579 st->print(" r%-2d = " INTPTR_FORMAT " |", i+1, uc->uc_mcontext.gregs[i+1]); 580 st->print(" r%-2d = %23.1ld " , i, uc->uc_mcontext.gregs[i]); 581 st->print(" r%-2d = %23.1ld " , i+1, uc->uc_mcontext.gregs[i+1]); 582 st->cr(); 583 } 584 st->cr(); 585 586 st->print_cr("Access Registers:"); 587 st->print_cr("-----------------"); 588 for( int i = 0; i < 16; i+=2 ) { 589 st->print(" ar%-2d = 0x%8.8x ", i, uc->uc_mcontext.aregs[i]); 590 st->print(" ar%-2d = 0x%8.8x ", i+1, uc->uc_mcontext.aregs[i+1]); 591 st->cr(); 592 } 593 st->cr(); 594 595 st->print_cr("Float Registers:"); 596 st->print_cr("----------------"); 597 for (int i = 0; i < 16; i += 2) { 598 st->print(" fr%-2d = " INTPTR_FORMAT " " , i, (int64_t)(uc->uc_mcontext.fpregs.fprs[i].d)); 599 st->print(" fr%-2d = " INTPTR_FORMAT " |", i+1, (int64_t)(uc->uc_mcontext.fpregs.fprs[i+1].d)); 600 st->print(" fr%-2d = %23.15e " , i, (uc->uc_mcontext.fpregs.fprs[i].d)); 601 st->print(" fr%-2d = %23.15e " , i+1, (uc->uc_mcontext.fpregs.fprs[i+1].d)); 602 st->cr(); 603 } 604 st->cr(); 605 st->cr(); 606 607 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 608 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); 609 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t)); 610 st->cr(); 611 612 // Note: it may be unsafe to inspect memory near pc. For example, pc may 613 // point to garbage if entry point in an nmethod is corrupted. Leave 614 // this at the end, and hope for the best. 615 address pc = os::Linux::ucontext_get_pc(uc); 616 if (Verbose) { st->print_cr("pc at " PTR_FORMAT, p2i(pc)); } 617 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 618 print_hex_dump(st, pc-64, pc+64, /*intrsize=*/4); 619 st->cr(); 620 } 621 622 void os::print_register_info(outputStream *st, const void *context) { 623 st->print("Not ported\n"); 624 } 625 626 #ifndef PRODUCT 627 void os::verify_stack_alignment() { 628 } 629 #endif 630 631 int os::extra_bang_size_in_bytes() { 632 // z/Architecture does not require the additional stack bang. 633 return 0; 634 }