| /* |
| * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| // no precompiled headers |
| #include "asm/macroAssembler.hpp" |
| #include "classfile/classLoader.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "code/icBuffer.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "jvm_linux.h" |
| #include "memory/allocation.inline.hpp" |
| #include "mutex_linux.inline.hpp" |
| #include "nativeInst_sparc.hpp" |
| #include "os_share_linux.hpp" |
| #include "prims/jniFastGetField.hpp" |
| #include "prims/jvm.h" |
| #include "prims/jvm_misc.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/extendedPC.hpp" |
| #include "runtime/frame.inline.hpp" |
| #include "runtime/interfaceSupport.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/osThread.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/stubRoutines.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "runtime/timer.hpp" |
| #include "utilities/events.hpp" |
| #include "utilities/vmError.hpp" |
| |
| // Linux/Sparc has rather obscure naming of registers in sigcontext |
| // different between 32 and 64 bits |
| #ifdef _LP64 |
| #define SIG_PC(x) ((x)->sigc_regs.tpc) |
| #define SIG_NPC(x) ((x)->sigc_regs.tnpc) |
| #define SIG_REGS(x) ((x)->sigc_regs) |
| #else |
| #define SIG_PC(x) ((x)->si_regs.pc) |
| #define SIG_NPC(x) ((x)->si_regs.npc) |
| #define SIG_REGS(x) ((x)->si_regs) |
| #endif |
| |
| // those are to reference registers in sigcontext |
| enum { |
| CON_G0 = 0, |
| CON_G1, |
| CON_G2, |
| CON_G3, |
| CON_G4, |
| CON_G5, |
| CON_G6, |
| CON_G7, |
| CON_O0, |
| CON_O1, |
| CON_O2, |
| CON_O3, |
| CON_O4, |
| CON_O5, |
| CON_O6, |
| CON_O7, |
| }; |
| |
| static inline void set_cont_address(sigcontext* ctx, address addr) { |
| SIG_PC(ctx) = (intptr_t)addr; |
| SIG_NPC(ctx) = (intptr_t)(addr+4); |
| } |
| |
| // For Forte Analyzer AsyncGetCallTrace profiling support - thread is |
| // currently interrupted by SIGPROF. |
| // os::Solaris::fetch_frame_from_ucontext() tries to skip nested |
| // signal frames. Currently we don't do that on Linux, so it's the |
| // same as os::fetch_frame_from_context(). |
| ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, |
| ucontext_t* uc, |
| intptr_t** ret_sp, |
| intptr_t** ret_fp) { |
| assert(thread != NULL, "just checking"); |
| assert(ret_sp != NULL, "just checking"); |
| assert(ret_fp != NULL, "just checking"); |
| |
| return os::fetch_frame_from_context(uc, ret_sp, ret_fp); |
| } |
| |
| ExtendedPC os::fetch_frame_from_context(void* ucVoid, |
| intptr_t** ret_sp, |
| intptr_t** ret_fp) { |
| ucontext_t* uc = (ucontext_t*) ucVoid; |
| ExtendedPC epc; |
| |
| if (uc != NULL) { |
| epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); |
| if (ret_sp) { |
| *ret_sp = os::Linux::ucontext_get_sp(uc); |
| } |
| if (ret_fp) { |
| *ret_fp = (intptr_t*)NULL; |
| } |
| } else { |
| // construct empty ExtendedPC for return value checking |
| epc = ExtendedPC(NULL); |
| if (ret_sp) { |
| *ret_sp = (intptr_t*) NULL; |
| } |
| if (ret_fp) { |
| *ret_fp = (intptr_t*) NULL; |
| } |
| } |
| |
| return epc; |
| } |
| |
| frame os::fetch_frame_from_context(void* ucVoid) { |
| intptr_t* sp; |
| ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL); |
| return frame(sp, frame::unpatchable, epc.pc()); |
| } |
| |
| frame os::get_sender_for_C_frame(frame* fr) { |
| return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc()); |
| } |
| |
| frame os::current_frame() { |
| intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); |
| frame myframe(sp, frame::unpatchable, |
| CAST_FROM_FN_PTR(address, os::current_frame)); |
| if (os::is_first_C_frame(&myframe)) { |
| // stack is not walkable |
| return frame(NULL, frame::unpatchable, NULL); |
| } else { |
| return os::get_sender_for_C_frame(&myframe); |
| } |
| } |
| |
| address os::current_stack_pointer() { |
| register void *sp __asm__ ("sp"); |
| return (address)sp; |
| } |
| |
| static void current_stack_region(address* bottom, size_t* size) { |
| if (os::Linux::is_initial_thread()) { |
| // initial thread needs special handling because pthread_getattr_np() |
| // may return bogus value. |
| *bottom = os::Linux::initial_thread_stack_bottom(); |
| *size = os::Linux::initial_thread_stack_size(); |
| } else { |
| pthread_attr_t attr; |
| |
| int rslt = pthread_getattr_np(pthread_self(), &attr); |
| |
| // JVM needs to know exact stack location, abort if it fails |
| if (rslt != 0) { |
| if (rslt == ENOMEM) { |
| vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); |
| } else { |
| fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
| } |
| } |
| |
| if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { |
| fatal("Can not locate current stack attributes!"); |
| } |
| |
| pthread_attr_destroy(&attr); |
| } |
| assert(os::current_stack_pointer() >= *bottom && |
| os::current_stack_pointer() < *bottom + *size, "just checking"); |
| } |
| |
| address os::current_stack_base() { |
| address bottom; |
| size_t size; |
| current_stack_region(&bottom, &size); |
| return bottom + size; |
| } |
| |
| size_t os::current_stack_size() { |
| // stack size includes normal stack and HotSpot guard pages |
| address bottom; |
| size_t size; |
| current_stack_region(&bottom, &size); |
| return size; |
| } |
| |
| char* os::non_memory_address_word() { |
| // Must never look like an address returned by reserve_memory, |
| // even in its subfields (as defined by the CPU immediate fields, |
| // if the CPU splits constants across multiple instructions). |
| // On SPARC, 0 != %hi(any real address), because there is no |
| // allocation in the first 1Kb of the virtual address space. |
| return (char*) 0; |
| } |
| |
| void os::initialize_thread(Thread* thr) {} |
| |
| void os::print_context(outputStream *st, void *context) { |
| if (context == NULL) return; |
| |
| ucontext_t* uc = (ucontext_t*)context; |
| sigcontext* sc = (sigcontext*)context; |
| st->print_cr("Registers:"); |
| |
| st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT |
| " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, |
| SIG_REGS(sc).u_regs[CON_G1], |
| SIG_REGS(sc).u_regs[CON_G2], |
| SIG_REGS(sc).u_regs[CON_G3], |
| SIG_REGS(sc).u_regs[CON_G4]); |
| st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT |
| " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT, |
| SIG_REGS(sc).u_regs[CON_G5], |
| SIG_REGS(sc).u_regs[CON_G6], |
| SIG_REGS(sc).u_regs[CON_G7], |
| SIG_REGS(sc).y); |
| st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT |
| " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, |
| SIG_REGS(sc).u_regs[CON_O0], |
| SIG_REGS(sc).u_regs[CON_O1], |
| SIG_REGS(sc).u_regs[CON_O2], |
| SIG_REGS(sc).u_regs[CON_O3]); |
| st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT |
| " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, |
| SIG_REGS(sc).u_regs[CON_O4], |
| SIG_REGS(sc).u_regs[CON_O5], |
| SIG_REGS(sc).u_regs[CON_O6], |
| SIG_REGS(sc).u_regs[CON_O7]); |
| |
| |
| intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); |
| st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT |
| " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, |
| sp[L0->sp_offset_in_saved_window()], |
| sp[L1->sp_offset_in_saved_window()], |
| sp[L2->sp_offset_in_saved_window()], |
| sp[L3->sp_offset_in_saved_window()]); |
| st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT |
| " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, |
| sp[L4->sp_offset_in_saved_window()], |
| sp[L5->sp_offset_in_saved_window()], |
| sp[L6->sp_offset_in_saved_window()], |
| sp[L7->sp_offset_in_saved_window()]); |
| st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT |
| " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, |
| sp[I0->sp_offset_in_saved_window()], |
| sp[I1->sp_offset_in_saved_window()], |
| sp[I2->sp_offset_in_saved_window()], |
| sp[I3->sp_offset_in_saved_window()]); |
| st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT |
| " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, |
| sp[I4->sp_offset_in_saved_window()], |
| sp[I5->sp_offset_in_saved_window()], |
| sp[I6->sp_offset_in_saved_window()], |
| sp[I7->sp_offset_in_saved_window()]); |
| |
| st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, |
| SIG_PC(sc), |
| SIG_NPC(sc)); |
| st->cr(); |
| st->cr(); |
| |
| st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); |
| print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); |
| st->cr(); |
| |
| // Note: it may be unsafe to inspect memory near pc. For example, pc may |
| // point to garbage if entry point in an nmethod is corrupted. Leave |
| // this at the end, and hope for the best. |
| address pc = os::Linux::ucontext_get_pc(uc); |
| st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); |
| print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); |
| } |
| |
| |
| void os::print_register_info(outputStream *st, void *context) { |
| if (context == NULL) return; |
| |
| ucontext_t *uc = (ucontext_t*)context; |
| sigcontext* sc = (sigcontext*)context; |
| intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); |
| |
| st->print_cr("Register to memory mapping:"); |
| st->cr(); |
| |
| // this is only for the "general purpose" registers |
| st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]); |
| st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]); |
| st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]); |
| st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]); |
| st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]); |
| st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]); |
| st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]); |
| st->cr(); |
| |
| st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]); |
| st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]); |
| st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]); |
| st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]); |
| st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]); |
| st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]); |
| st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]); |
| st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]); |
| st->cr(); |
| |
| st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); |
| st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); |
| st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); |
| st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); |
| st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); |
| st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); |
| st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); |
| st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); |
| st->cr(); |
| |
| st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); |
| st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); |
| st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); |
| st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); |
| st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); |
| st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); |
| st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); |
| st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); |
| st->cr(); |
| } |
| |
| |
| address os::Linux::ucontext_get_pc(ucontext_t* uc) { |
| return (address) SIG_PC((sigcontext*)uc); |
| } |
| |
| intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) { |
| return (intptr_t*) |
| ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); |
| } |
| |
| // not used on Sparc |
| intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) { |
| ShouldNotReachHere(); |
| return NULL; |
| } |
| |
| // Utility functions |
| |
| inline static bool checkPrefetch(sigcontext* uc, address pc) { |
| if (StubRoutines::is_safefetch_fault(pc)) { |
| set_cont_address(uc, address(StubRoutines::continuation_for_safefetch_fault(pc))); |
| return true; |
| } |
| return false; |
| } |
| |
| inline static bool checkOverflow(sigcontext* uc, |
| address pc, |
| address addr, |
| JavaThread* thread, |
| address* stub) { |
| // check if fault address is within thread stack |
| if (addr < thread->stack_base() && |
| addr >= thread->stack_base() - thread->stack_size()) { |
| // stack overflow |
| if (thread->in_stack_yellow_zone(addr)) { |
| thread->disable_stack_yellow_zone(); |
| if (thread->thread_state() == _thread_in_Java) { |
| // Throw a stack overflow exception. Guard pages will be reenabled |
| // while unwinding the stack. |
| *stub = |
| SharedRuntime::continuation_for_implicit_exception(thread, |
| pc, |
| SharedRuntime::STACK_OVERFLOW); |
| } else { |
| // Thread was in the vm or native code. Return and try to finish. |
| return true; |
| } |
| } else if (thread->in_stack_red_zone(addr)) { |
| // Fatal red zone violation. Disable the guard pages and fall through |
| // to handle_unexpected_exception way down below. |
| thread->disable_stack_red_zone(); |
| tty->print_raw_cr("An irrecoverable stack overflow has occurred."); |
| |
| // This is a likely cause, but hard to verify. Let's just print |
| // it as a hint. |
| tty->print_raw_cr("Please check if any of your loaded .so files has " |
| "enabled executable stack (see man page execstack(8))"); |
| } else { |
| // Accessing stack address below sp may cause SEGV if current |
| // thread has MAP_GROWSDOWN stack. This should only happen when |
| // current thread was created by user code with MAP_GROWSDOWN flag |
| // and then attached to VM. See notes in os_linux.cpp. |
| if (thread->osthread()->expanding_stack() == 0) { |
| thread->osthread()->set_expanding_stack(); |
| if (os::Linux::manually_expand_stack(thread, addr)) { |
| thread->osthread()->clear_expanding_stack(); |
| return true; |
| } |
| thread->osthread()->clear_expanding_stack(); |
| } else { |
| fatal("recursive segv. expanding stack."); |
| } |
| } |
| } |
| return false; |
| } |
| |
| inline static bool checkPollingPage(address pc, address fault, address* stub) { |
| if (fault == os::get_polling_page()) { |
| *stub = SharedRuntime::get_poll_stub(pc); |
| return true; |
| } |
| return false; |
| } |
| |
| inline static bool checkByteBuffer(address pc, address* stub) { |
| // BugId 4454115: A read from a MappedByteBuffer can fault |
| // here if the underlying file has been truncated. |
| // Do not crash the VM in such a case. |
| CodeBlob* cb = CodeCache::find_blob_unsafe(pc); |
| nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; |
| if (nm != NULL && nm->has_unsafe_access()) { |
| *stub = StubRoutines::handler_for_unsafe_access(); |
| return true; |
| } |
| return false; |
| } |
| |
| inline static bool checkVerifyOops(address pc, address fault, address* stub) { |
| if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] |
| && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { |
| *stub = MacroAssembler::_verify_oop_implicit_branch[2]; |
| warning("fixed up memory fault in +VerifyOops at address " |
| INTPTR_FORMAT, fault); |
| return true; |
| } |
| return false; |
| } |
| |
| inline static bool checkFPFault(address pc, int code, |
| JavaThread* thread, address* stub) { |
| if (code == FPE_INTDIV || code == FPE_FLTDIV) { |
| *stub = |
| SharedRuntime:: |
| continuation_for_implicit_exception(thread, |
| pc, |
| SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); |
| return true; |
| } |
| return false; |
| } |
| |
| inline static bool checkNullPointer(address pc, intptr_t fault, |
| JavaThread* thread, address* stub) { |
| if (!MacroAssembler::needs_explicit_null_check(fault)) { |
| // Determination of interpreter/vtable stub/compiled code null |
| // exception |
| *stub = |
| SharedRuntime:: |
| continuation_for_implicit_exception(thread, pc, |
| SharedRuntime::IMPLICIT_NULL); |
| return true; |
| } |
| return false; |
| } |
| |
| inline static bool checkFastJNIAccess(address pc, address* stub) { |
| address addr = JNI_FastGetField::find_slowcase_pc(pc); |
| if (addr != (address)-1) { |
| *stub = addr; |
| return true; |
| } |
| return false; |
| } |
| |
| inline static bool checkSerializePage(JavaThread* thread, address addr) { |
| return os::is_memory_serialize_page(thread, addr); |
| } |
| |
| inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { |
| if (nativeInstruction_at(*pc)->is_zombie()) { |
| // zombie method (ld [%g0],%o7 instruction) |
| *stub = SharedRuntime::get_handle_wrong_method_stub(); |
| |
| // At the stub it needs to look like a call from the caller of this |
| // method (not a call from the segv site). |
| *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; |
| return true; |
| } |
| return false; |
| } |
| |
| inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { |
| #ifdef COMPILER2 |
| if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { |
| #ifdef ASSERT |
| #ifdef TIERED |
| CodeBlob* cb = CodeCache::find_blob_unsafe(*pc); |
| assert(cb->is_compiled_by_c2(), "Wrong compiler"); |
| #endif // TIERED |
| #endif // ASSERT |
| // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. |
| *stub = SharedRuntime::get_ic_miss_stub(); |
| // At the stub it needs to look like a call from the caller of this |
| // method (not a call from the segv site). |
| *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; |
| return true; |
| } |
| #endif // COMPILER2 |
| return false; |
| } |
| |
| extern "C" JNIEXPORT int |
| JVM_handle_linux_signal(int sig, |
| siginfo_t* info, |
| void* ucVoid, |
| int abort_if_unrecognized) { |
| // in fact this isn't ucontext_t* at all, but struct sigcontext* |
| // but Linux porting layer uses ucontext_t, so to minimize code change |
| // we cast as needed |
| ucontext_t* ucFake = (ucontext_t*) ucVoid; |
| sigcontext* uc = (sigcontext*)ucVoid; |
| |
| Thread* t = ThreadLocalStorage::get_thread_slow(); |
| |
| // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away |
| // (no destructors can be run) |
| os::WatcherThreadCrashProtection::check_crash_protection(sig, t); |
| |
| SignalHandlerMark shm(t); |
| |
| // Note: it's not uncommon that JNI code uses signal/sigset to install |
| // then restore certain signal handler (e.g. to temporarily block SIGPIPE, |
| // or have a SIGILL handler when detecting CPU type). When that happens, |
| // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To |
| // avoid unnecessary crash when libjsig is not preloaded, try handle signals |
| // that do not require siginfo/ucontext first. |
| |
| if (sig == SIGPIPE || sig == SIGXFSZ) { |
| // allow chained handler to go first |
| if (os::Linux::chained_handler(sig, info, ucVoid)) { |
| return true; |
| } else { |
| if (PrintMiscellaneous && (WizardMode || Verbose)) { |
| char buf[64]; |
| warning("Ignoring %s - see bugs 4229104 or 646499219", |
| os::exception_name(sig, buf, sizeof(buf))); |
| } |
| return true; |
| } |
| } |
| |
| JavaThread* thread = NULL; |
| VMThread* vmthread = NULL; |
| if (os::Linux::signal_handlers_are_installed) { |
| if (t != NULL ){ |
| if(t->is_Java_thread()) { |
| thread = (JavaThread*)t; |
| } |
| else if(t->is_VM_thread()){ |
| vmthread = (VMThread *)t; |
| } |
| } |
| } |
| |
| // decide if this trap can be handled by a stub |
| address stub = NULL; |
| address pc = NULL; |
| address npc = NULL; |
| |
| //%note os_trap_1 |
| if (info != NULL && uc != NULL && thread != NULL) { |
| pc = address(SIG_PC(uc)); |
| npc = address(SIG_NPC(uc)); |
| |
| // Check to see if we caught the safepoint code in the |
| // process of write protecting the memory serialization page. |
| // It write enables the page immediately after protecting it |
| // so we can just return to retry the write. |
| if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { |
| // Block current thread until the memory serialize page permission restored. |
| os::block_on_serialize_page_trap(); |
| return 1; |
| } |
| |
| if (checkPrefetch(uc, pc)) { |
| return 1; |
| } |
| |
| // Handle ALL stack overflow variations here |
| if (sig == SIGSEGV) { |
| if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { |
| return 1; |
| } |
| } |
| |
| if (sig == SIGBUS && |
| thread->thread_state() == _thread_in_vm && |
| thread->doing_unsafe_access()) { |
| stub = StubRoutines::handler_for_unsafe_access(); |
| } |
| |
| if (thread->thread_state() == _thread_in_Java) { |
| do { |
| // Java thread running in Java code => find exception handler if any |
| // a fault inside compiled code, the interpreter, or a stub |
| |
| if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { |
| break; |
| } |
| |
| if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { |
| break; |
| } |
| |
| if ((sig == SIGSEGV || sig == SIGBUS) && |
| checkVerifyOops(pc, (address)info->si_addr, &stub)) { |
| break; |
| } |
| |
| if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { |
| break; |
| } |
| |
| if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { |
| break; |
| } |
| |
| if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { |
| break; |
| } |
| |
| if ((sig == SIGSEGV) && |
| checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { |
| break; |
| } |
| } while (0); |
| |
| // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in |
| // and the heap gets shrunk before the field access. |
| if ((sig == SIGSEGV) || (sig == SIGBUS)) { |
| checkFastJNIAccess(pc, &stub); |
| } |
| } |
| |
| if (stub != NULL) { |
| // save all thread context in case we need to restore it |
| thread->set_saved_exception_pc(pc); |
| thread->set_saved_exception_npc(npc); |
| set_cont_address(uc, stub); |
| return true; |
| } |
| } |
| |
| // signal-chaining |
| if (os::Linux::chained_handler(sig, info, ucVoid)) { |
| return true; |
| } |
| |
| if (!abort_if_unrecognized) { |
| // caller wants another chance, so give it to him |
| return false; |
| } |
| |
| if (pc == NULL && uc != NULL) { |
| pc = os::Linux::ucontext_get_pc((ucontext_t*)uc); |
| } |
| |
| // unmask current signal |
| sigset_t newset; |
| sigemptyset(&newset); |
| sigaddset(&newset, sig); |
| sigprocmask(SIG_UNBLOCK, &newset, NULL); |
| |
| VMError err(t, sig, pc, info, ucVoid); |
| err.report_and_die(); |
| |
| ShouldNotReachHere(); |
| } |
| |
| void os::Linux::init_thread_fpu_state(void) { |
| // Nothing to do |
| } |
| |
| int os::Linux::get_fpu_control_word() { |
| return 0; |
| } |
| |
| void os::Linux::set_fpu_control_word(int fpu) { |
| // nothing |
| } |
| |
| bool os::is_allocatable(size_t bytes) { |
| #ifdef _LP64 |
| return true; |
| #else |
| if (bytes < 2 * G) { |
| return true; |
| } |
| |
| char* addr = reserve_memory(bytes, NULL); |
| |
| if (addr != NULL) { |
| release_memory(addr, bytes); |
| } |
| |
| return addr != NULL; |
| #endif // _LP64 |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // thread stack |
| |
| size_t os::Linux::min_stack_allowed = 128 * K; |
| |
| // pthread on Ubuntu is always in floating stack mode |
| bool os::Linux::supports_variable_stack_size() { return true; } |
| |
| // return default stack size for thr_type |
| size_t os::Linux::default_stack_size(os::ThreadType thr_type) { |
| // default stack size (compiler thread needs larger stack) |
| size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); |
| return s; |
| } |
| |
| size_t os::Linux::default_guard_size(os::ThreadType thr_type) { |
| // Creating guard page is very expensive. Java thread has HotSpot |
| // guard page, only enable glibc guard page for non-Java threads. |
| return (thr_type == java_thread ? 0 : page_size()); |
| } |
| |
| #ifndef PRODUCT |
| void os::verify_stack_alignment() { |
| } |
| #endif |
